| 1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * |
| 3 | *************************************************/ |
| 4 | |
| 5 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
| 6 | /* See the file NOTICE for conditions of use and distribution. */ |
| 7 | |
| 8 | |
| 9 | /* Functions for handling string expansion. */ |
| 10 | |
| 11 | |
| 12 | #include "exim.h" |
| 13 | |
| 14 | /* Recursively called function */ |
| 15 | |
| 16 | static uschar *expand_string_internal(const uschar *, BOOL, const uschar **, BOOL, BOOL, BOOL *); |
| 17 | static int_eximarith_t expanded_string_integer(const uschar *, BOOL); |
| 18 | |
| 19 | #ifdef STAND_ALONE |
| 20 | # ifndef SUPPORT_CRYPTEQ |
| 21 | # define SUPPORT_CRYPTEQ |
| 22 | # endif |
| 23 | #endif |
| 24 | |
| 25 | #ifdef LOOKUP_LDAP |
| 26 | # include "lookups/ldap.h" |
| 27 | #endif |
| 28 | |
| 29 | #ifdef SUPPORT_CRYPTEQ |
| 30 | # ifdef CRYPT_H |
| 31 | # include <crypt.h> |
| 32 | # endif |
| 33 | # ifndef HAVE_CRYPT16 |
| 34 | extern char* crypt16(char*, char*); |
| 35 | # endif |
| 36 | #endif |
| 37 | |
| 38 | /* The handling of crypt16() is a mess. I will record below the analysis of the |
| 39 | mess that was sent to me. We decided, however, to make changing this very low |
| 40 | priority, because in practice people are moving away from the crypt() |
| 41 | algorithms nowadays, so it doesn't seem worth it. |
| 42 | |
| 43 | <quote> |
| 44 | There is an algorithm named "crypt16" in Ultrix and Tru64. It crypts |
| 45 | the first 8 characters of the password using a 20-round version of crypt |
| 46 | (standard crypt does 25 rounds). It then crypts the next 8 characters, |
| 47 | or an empty block if the password is less than 9 characters, using a |
| 48 | 20-round version of crypt and the same salt as was used for the first |
| 49 | block. Characters after the first 16 are ignored. It always generates |
| 50 | a 16-byte hash, which is expressed together with the salt as a string |
| 51 | of 24 base 64 digits. Here are some links to peruse: |
| 52 | |
| 53 | http://cvs.pld.org.pl/pam/pamcrypt/crypt16.c?rev=1.2 |
| 54 | http://seclists.org/bugtraq/1999/Mar/0076.html |
| 55 | |
| 56 | There's a different algorithm named "bigcrypt" in HP-UX, Digital Unix, |
| 57 | and OSF/1. This is the same as the standard crypt if given a password |
| 58 | of 8 characters or less. If given more, it first does the same as crypt |
| 59 | using the first 8 characters, then crypts the next 8 (the 9th to 16th) |
| 60 | using as salt the first two base 64 digits from the first hash block. |
| 61 | If the password is more than 16 characters then it crypts the 17th to 24th |
| 62 | characters using as salt the first two base 64 digits from the second hash |
| 63 | block. And so on: I've seen references to it cutting off the password at |
| 64 | 40 characters (5 blocks), 80 (10 blocks), or 128 (16 blocks). Some links: |
| 65 | |
| 66 | http://cvs.pld.org.pl/pam/pamcrypt/bigcrypt.c?rev=1.2 |
| 67 | http://seclists.org/bugtraq/1999/Mar/0109.html |
| 68 | http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-Q0R2D- |
| 69 | TET1_html/sec.c222.html#no_id_208 |
| 70 | |
| 71 | Exim has something it calls "crypt16". It will either use a native |
| 72 | crypt16 or its own implementation. A native crypt16 will presumably |
| 73 | be the one that I called "crypt16" above. The internal "crypt16" |
| 74 | function, however, is a two-block-maximum implementation of what I called |
| 75 | "bigcrypt". The documentation matches the internal code. |
| 76 | |
| 77 | I suspect that whoever did the "crypt16" stuff for Exim didn't realise |
| 78 | that crypt16 and bigcrypt were different things. |
| 79 | |
| 80 | Exim uses the LDAP-style scheme identifier "{crypt16}" to refer |
| 81 | to whatever it is using under that name. This unfortunately sets a |
| 82 | precedent for using "{crypt16}" to identify two incompatible algorithms |
| 83 | whose output can't be distinguished. With "{crypt16}" thus rendered |
| 84 | ambiguous, I suggest you deprecate it and invent two new identifiers |
| 85 | for the two algorithms. |
| 86 | |
| 87 | Both crypt16 and bigcrypt are very poor algorithms, btw. Hashing parts |
| 88 | of the password separately means they can be cracked separately, so |
| 89 | the double-length hash only doubles the cracking effort instead of |
| 90 | squaring it. I recommend salted SHA-1 ({SSHA}), or the Blowfish-based |
| 91 | bcrypt ({CRYPT}$2a$). |
| 92 | </quote> |
| 93 | */ |
| 94 | |
| 95 | |
| 96 | |
| 97 | /************************************************* |
| 98 | * Local statics and tables * |
| 99 | *************************************************/ |
| 100 | |
| 101 | /* Table of item names, and corresponding switch numbers. The names must be in |
| 102 | alphabetical order. */ |
| 103 | |
| 104 | static uschar *item_table[] = { |
| 105 | US"acl", |
| 106 | US"authresults", |
| 107 | US"certextract", |
| 108 | US"dlfunc", |
| 109 | US"env", |
| 110 | US"extract", |
| 111 | US"filter", |
| 112 | US"hash", |
| 113 | US"hmac", |
| 114 | US"if", |
| 115 | #ifdef SUPPORT_I18N |
| 116 | US"imapfolder", |
| 117 | #endif |
| 118 | US"length", |
| 119 | US"listextract", |
| 120 | US"lookup", |
| 121 | US"map", |
| 122 | US"nhash", |
| 123 | US"perl", |
| 124 | US"prvs", |
| 125 | US"prvscheck", |
| 126 | US"readfile", |
| 127 | US"readsocket", |
| 128 | US"reduce", |
| 129 | US"run", |
| 130 | US"sg", |
| 131 | US"sort", |
| 132 | #ifdef EXPERIMENTAL_SRS_NATIVE |
| 133 | US"srs_encode", |
| 134 | #endif |
| 135 | US"substr", |
| 136 | US"tr" }; |
| 137 | |
| 138 | enum { |
| 139 | EITEM_ACL, |
| 140 | EITEM_AUTHRESULTS, |
| 141 | EITEM_CERTEXTRACT, |
| 142 | EITEM_DLFUNC, |
| 143 | EITEM_ENV, |
| 144 | EITEM_EXTRACT, |
| 145 | EITEM_FILTER, |
| 146 | EITEM_HASH, |
| 147 | EITEM_HMAC, |
| 148 | EITEM_IF, |
| 149 | #ifdef SUPPORT_I18N |
| 150 | EITEM_IMAPFOLDER, |
| 151 | #endif |
| 152 | EITEM_LENGTH, |
| 153 | EITEM_LISTEXTRACT, |
| 154 | EITEM_LOOKUP, |
| 155 | EITEM_MAP, |
| 156 | EITEM_NHASH, |
| 157 | EITEM_PERL, |
| 158 | EITEM_PRVS, |
| 159 | EITEM_PRVSCHECK, |
| 160 | EITEM_READFILE, |
| 161 | EITEM_READSOCK, |
| 162 | EITEM_REDUCE, |
| 163 | EITEM_RUN, |
| 164 | EITEM_SG, |
| 165 | EITEM_SORT, |
| 166 | #ifdef EXPERIMENTAL_SRS_NATIVE |
| 167 | EITEM_SRS_ENCODE, |
| 168 | #endif |
| 169 | EITEM_SUBSTR, |
| 170 | EITEM_TR }; |
| 171 | |
| 172 | /* Tables of operator names, and corresponding switch numbers. The names must be |
| 173 | in alphabetical order. There are two tables, because underscore is used in some |
| 174 | cases to introduce arguments, whereas for other it is part of the name. This is |
| 175 | an historical mis-design. */ |
| 176 | |
| 177 | static uschar *op_table_underscore[] = { |
| 178 | US"from_utf8", |
| 179 | US"local_part", |
| 180 | US"quote_local_part", |
| 181 | US"reverse_ip", |
| 182 | US"time_eval", |
| 183 | US"time_interval" |
| 184 | #ifdef SUPPORT_I18N |
| 185 | ,US"utf8_domain_from_alabel", |
| 186 | US"utf8_domain_to_alabel", |
| 187 | US"utf8_localpart_from_alabel", |
| 188 | US"utf8_localpart_to_alabel" |
| 189 | #endif |
| 190 | }; |
| 191 | |
| 192 | enum { |
| 193 | EOP_FROM_UTF8, |
| 194 | EOP_LOCAL_PART, |
| 195 | EOP_QUOTE_LOCAL_PART, |
| 196 | EOP_REVERSE_IP, |
| 197 | EOP_TIME_EVAL, |
| 198 | EOP_TIME_INTERVAL |
| 199 | #ifdef SUPPORT_I18N |
| 200 | ,EOP_UTF8_DOMAIN_FROM_ALABEL, |
| 201 | EOP_UTF8_DOMAIN_TO_ALABEL, |
| 202 | EOP_UTF8_LOCALPART_FROM_ALABEL, |
| 203 | EOP_UTF8_LOCALPART_TO_ALABEL |
| 204 | #endif |
| 205 | }; |
| 206 | |
| 207 | static uschar *op_table_main[] = { |
| 208 | US"address", |
| 209 | US"addresses", |
| 210 | US"base32", |
| 211 | US"base32d", |
| 212 | US"base62", |
| 213 | US"base62d", |
| 214 | US"base64", |
| 215 | US"base64d", |
| 216 | US"bless", |
| 217 | US"domain", |
| 218 | US"escape", |
| 219 | US"escape8bit", |
| 220 | US"eval", |
| 221 | US"eval10", |
| 222 | US"expand", |
| 223 | US"h", |
| 224 | US"hash", |
| 225 | US"hex2b64", |
| 226 | US"hexquote", |
| 227 | US"ipv6denorm", |
| 228 | US"ipv6norm", |
| 229 | US"l", |
| 230 | US"lc", |
| 231 | US"length", |
| 232 | US"listcount", |
| 233 | US"listnamed", |
| 234 | US"mask", |
| 235 | US"md5", |
| 236 | US"nh", |
| 237 | US"nhash", |
| 238 | US"quote", |
| 239 | US"randint", |
| 240 | US"rfc2047", |
| 241 | US"rfc2047d", |
| 242 | US"rxquote", |
| 243 | US"s", |
| 244 | US"sha1", |
| 245 | US"sha2", |
| 246 | US"sha256", |
| 247 | US"sha3", |
| 248 | US"stat", |
| 249 | US"str2b64", |
| 250 | US"strlen", |
| 251 | US"substr", |
| 252 | US"uc", |
| 253 | US"utf8clean" }; |
| 254 | |
| 255 | enum { |
| 256 | EOP_ADDRESS = nelem(op_table_underscore), |
| 257 | EOP_ADDRESSES, |
| 258 | EOP_BASE32, |
| 259 | EOP_BASE32D, |
| 260 | EOP_BASE62, |
| 261 | EOP_BASE62D, |
| 262 | EOP_BASE64, |
| 263 | EOP_BASE64D, |
| 264 | EOP_BLESS, |
| 265 | EOP_DOMAIN, |
| 266 | EOP_ESCAPE, |
| 267 | EOP_ESCAPE8BIT, |
| 268 | EOP_EVAL, |
| 269 | EOP_EVAL10, |
| 270 | EOP_EXPAND, |
| 271 | EOP_H, |
| 272 | EOP_HASH, |
| 273 | EOP_HEX2B64, |
| 274 | EOP_HEXQUOTE, |
| 275 | EOP_IPV6DENORM, |
| 276 | EOP_IPV6NORM, |
| 277 | EOP_L, |
| 278 | EOP_LC, |
| 279 | EOP_LENGTH, |
| 280 | EOP_LISTCOUNT, |
| 281 | EOP_LISTNAMED, |
| 282 | EOP_MASK, |
| 283 | EOP_MD5, |
| 284 | EOP_NH, |
| 285 | EOP_NHASH, |
| 286 | EOP_QUOTE, |
| 287 | EOP_RANDINT, |
| 288 | EOP_RFC2047, |
| 289 | EOP_RFC2047D, |
| 290 | EOP_RXQUOTE, |
| 291 | EOP_S, |
| 292 | EOP_SHA1, |
| 293 | EOP_SHA2, |
| 294 | EOP_SHA256, |
| 295 | EOP_SHA3, |
| 296 | EOP_STAT, |
| 297 | EOP_STR2B64, |
| 298 | EOP_STRLEN, |
| 299 | EOP_SUBSTR, |
| 300 | EOP_UC, |
| 301 | EOP_UTF8CLEAN }; |
| 302 | |
| 303 | |
| 304 | /* Table of condition names, and corresponding switch numbers. The names must |
| 305 | be in alphabetical order. */ |
| 306 | |
| 307 | static uschar *cond_table[] = { |
| 308 | US"<", |
| 309 | US"<=", |
| 310 | US"=", |
| 311 | US"==", /* Backward compatibility */ |
| 312 | US">", |
| 313 | US">=", |
| 314 | US"acl", |
| 315 | US"and", |
| 316 | US"bool", |
| 317 | US"bool_lax", |
| 318 | US"crypteq", |
| 319 | US"def", |
| 320 | US"eq", |
| 321 | US"eqi", |
| 322 | US"exists", |
| 323 | US"first_delivery", |
| 324 | US"forall", |
| 325 | US"forall_json", |
| 326 | US"forall_jsons", |
| 327 | US"forany", |
| 328 | US"forany_json", |
| 329 | US"forany_jsons", |
| 330 | US"ge", |
| 331 | US"gei", |
| 332 | US"gt", |
| 333 | US"gti", |
| 334 | #ifdef EXPERIMENTAL_SRS_NATIVE |
| 335 | US"inbound_srs", |
| 336 | #endif |
| 337 | US"inlist", |
| 338 | US"inlisti", |
| 339 | US"isip", |
| 340 | US"isip4", |
| 341 | US"isip6", |
| 342 | US"ldapauth", |
| 343 | US"le", |
| 344 | US"lei", |
| 345 | US"lt", |
| 346 | US"lti", |
| 347 | US"match", |
| 348 | US"match_address", |
| 349 | US"match_domain", |
| 350 | US"match_ip", |
| 351 | US"match_local_part", |
| 352 | US"or", |
| 353 | US"pam", |
| 354 | US"pwcheck", |
| 355 | US"queue_running", |
| 356 | US"radius", |
| 357 | US"saslauthd" |
| 358 | }; |
| 359 | |
| 360 | enum { |
| 361 | ECOND_NUM_L, |
| 362 | ECOND_NUM_LE, |
| 363 | ECOND_NUM_E, |
| 364 | ECOND_NUM_EE, |
| 365 | ECOND_NUM_G, |
| 366 | ECOND_NUM_GE, |
| 367 | ECOND_ACL, |
| 368 | ECOND_AND, |
| 369 | ECOND_BOOL, |
| 370 | ECOND_BOOL_LAX, |
| 371 | ECOND_CRYPTEQ, |
| 372 | ECOND_DEF, |
| 373 | ECOND_STR_EQ, |
| 374 | ECOND_STR_EQI, |
| 375 | ECOND_EXISTS, |
| 376 | ECOND_FIRST_DELIVERY, |
| 377 | ECOND_FORALL, |
| 378 | ECOND_FORALL_JSON, |
| 379 | ECOND_FORALL_JSONS, |
| 380 | ECOND_FORANY, |
| 381 | ECOND_FORANY_JSON, |
| 382 | ECOND_FORANY_JSONS, |
| 383 | ECOND_STR_GE, |
| 384 | ECOND_STR_GEI, |
| 385 | ECOND_STR_GT, |
| 386 | ECOND_STR_GTI, |
| 387 | #ifdef EXPERIMENTAL_SRS_NATIVE |
| 388 | ECOND_INBOUND_SRS, |
| 389 | #endif |
| 390 | ECOND_INLIST, |
| 391 | ECOND_INLISTI, |
| 392 | ECOND_ISIP, |
| 393 | ECOND_ISIP4, |
| 394 | ECOND_ISIP6, |
| 395 | ECOND_LDAPAUTH, |
| 396 | ECOND_STR_LE, |
| 397 | ECOND_STR_LEI, |
| 398 | ECOND_STR_LT, |
| 399 | ECOND_STR_LTI, |
| 400 | ECOND_MATCH, |
| 401 | ECOND_MATCH_ADDRESS, |
| 402 | ECOND_MATCH_DOMAIN, |
| 403 | ECOND_MATCH_IP, |
| 404 | ECOND_MATCH_LOCAL_PART, |
| 405 | ECOND_OR, |
| 406 | ECOND_PAM, |
| 407 | ECOND_PWCHECK, |
| 408 | ECOND_QUEUE_RUNNING, |
| 409 | ECOND_RADIUS, |
| 410 | ECOND_SASLAUTHD |
| 411 | }; |
| 412 | |
| 413 | |
| 414 | /* Types of table entry */ |
| 415 | |
| 416 | enum vtypes { |
| 417 | vtype_int, /* value is address of int */ |
| 418 | vtype_filter_int, /* ditto, but recognized only when filtering */ |
| 419 | vtype_ino, /* value is address of ino_t (not always an int) */ |
| 420 | vtype_uid, /* value is address of uid_t (not always an int) */ |
| 421 | vtype_gid, /* value is address of gid_t (not always an int) */ |
| 422 | vtype_bool, /* value is address of bool */ |
| 423 | vtype_stringptr, /* value is address of pointer to string */ |
| 424 | vtype_msgbody, /* as stringptr, but read when first required */ |
| 425 | vtype_msgbody_end, /* ditto, the end of the message */ |
| 426 | vtype_msgheaders, /* the message's headers, processed */ |
| 427 | vtype_msgheaders_raw, /* the message's headers, unprocessed */ |
| 428 | vtype_localpart, /* extract local part from string */ |
| 429 | vtype_domain, /* extract domain from string */ |
| 430 | vtype_string_func, /* value is string returned by given function */ |
| 431 | vtype_todbsdin, /* value not used; generate BSD inbox tod */ |
| 432 | vtype_tode, /* value not used; generate tod in epoch format */ |
| 433 | vtype_todel, /* value not used; generate tod in epoch/usec format */ |
| 434 | vtype_todf, /* value not used; generate full tod */ |
| 435 | vtype_todl, /* value not used; generate log tod */ |
| 436 | vtype_todlf, /* value not used; generate log file datestamp tod */ |
| 437 | vtype_todzone, /* value not used; generate time zone only */ |
| 438 | vtype_todzulu, /* value not used; generate zulu tod */ |
| 439 | vtype_reply, /* value not used; get reply from headers */ |
| 440 | vtype_pid, /* value not used; result is pid */ |
| 441 | vtype_host_lookup, /* value not used; get host name */ |
| 442 | vtype_load_avg, /* value not used; result is int from os_getloadavg */ |
| 443 | vtype_pspace, /* partition space; value is T/F for spool/log */ |
| 444 | vtype_pinodes, /* partition inodes; value is T/F for spool/log */ |
| 445 | vtype_cert /* SSL certificate */ |
| 446 | #ifndef DISABLE_DKIM |
| 447 | ,vtype_dkim /* Lookup of value in DKIM signature */ |
| 448 | #endif |
| 449 | }; |
| 450 | |
| 451 | /* Type for main variable table */ |
| 452 | |
| 453 | typedef struct { |
| 454 | const char *name; |
| 455 | enum vtypes type; |
| 456 | void *value; |
| 457 | } var_entry; |
| 458 | |
| 459 | /* Type for entries pointing to address/length pairs. Not currently |
| 460 | in use. */ |
| 461 | |
| 462 | typedef struct { |
| 463 | uschar **address; |
| 464 | int *length; |
| 465 | } alblock; |
| 466 | |
| 467 | static uschar * fn_recipients(void); |
| 468 | typedef uschar * stringptr_fn_t(void); |
| 469 | static uschar * fn_queue_size(void); |
| 470 | |
| 471 | /* This table must be kept in alphabetical order. */ |
| 472 | |
| 473 | static var_entry var_table[] = { |
| 474 | /* WARNING: Do not invent variables whose names start acl_c or acl_m because |
| 475 | they will be confused with user-creatable ACL variables. */ |
| 476 | { "acl_arg1", vtype_stringptr, &acl_arg[0] }, |
| 477 | { "acl_arg2", vtype_stringptr, &acl_arg[1] }, |
| 478 | { "acl_arg3", vtype_stringptr, &acl_arg[2] }, |
| 479 | { "acl_arg4", vtype_stringptr, &acl_arg[3] }, |
| 480 | { "acl_arg5", vtype_stringptr, &acl_arg[4] }, |
| 481 | { "acl_arg6", vtype_stringptr, &acl_arg[5] }, |
| 482 | { "acl_arg7", vtype_stringptr, &acl_arg[6] }, |
| 483 | { "acl_arg8", vtype_stringptr, &acl_arg[7] }, |
| 484 | { "acl_arg9", vtype_stringptr, &acl_arg[8] }, |
| 485 | { "acl_narg", vtype_int, &acl_narg }, |
| 486 | { "acl_verify_message", vtype_stringptr, &acl_verify_message }, |
| 487 | { "address_data", vtype_stringptr, &deliver_address_data }, |
| 488 | { "address_file", vtype_stringptr, &address_file }, |
| 489 | { "address_pipe", vtype_stringptr, &address_pipe }, |
| 490 | #ifdef EXPERIMENTAL_ARC |
| 491 | { "arc_domains", vtype_string_func, (void *) &fn_arc_domains }, |
| 492 | { "arc_oldest_pass", vtype_int, &arc_oldest_pass }, |
| 493 | { "arc_state", vtype_stringptr, &arc_state }, |
| 494 | { "arc_state_reason", vtype_stringptr, &arc_state_reason }, |
| 495 | #endif |
| 496 | { "authenticated_fail_id",vtype_stringptr, &authenticated_fail_id }, |
| 497 | { "authenticated_id", vtype_stringptr, &authenticated_id }, |
| 498 | { "authenticated_sender",vtype_stringptr, &authenticated_sender }, |
| 499 | { "authentication_failed",vtype_int, &authentication_failed }, |
| 500 | #ifdef WITH_CONTENT_SCAN |
| 501 | { "av_failed", vtype_int, &av_failed }, |
| 502 | #endif |
| 503 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
| 504 | { "bmi_alt_location", vtype_stringptr, &bmi_alt_location }, |
| 505 | { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict }, |
| 506 | { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict }, |
| 507 | { "bmi_deliver", vtype_int, &bmi_deliver }, |
| 508 | #endif |
| 509 | { "body_linecount", vtype_int, &body_linecount }, |
| 510 | { "body_zerocount", vtype_int, &body_zerocount }, |
| 511 | { "bounce_recipient", vtype_stringptr, &bounce_recipient }, |
| 512 | { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit }, |
| 513 | { "caller_gid", vtype_gid, &real_gid }, |
| 514 | { "caller_uid", vtype_uid, &real_uid }, |
| 515 | { "callout_address", vtype_stringptr, &callout_address }, |
| 516 | { "compile_date", vtype_stringptr, &version_date }, |
| 517 | { "compile_number", vtype_stringptr, &version_cnumber }, |
| 518 | { "config_dir", vtype_stringptr, &config_main_directory }, |
| 519 | { "config_file", vtype_stringptr, &config_main_filename }, |
| 520 | { "csa_status", vtype_stringptr, &csa_status }, |
| 521 | #ifdef EXPERIMENTAL_DCC |
| 522 | { "dcc_header", vtype_stringptr, &dcc_header }, |
| 523 | { "dcc_result", vtype_stringptr, &dcc_result }, |
| 524 | #endif |
| 525 | #ifndef DISABLE_DKIM |
| 526 | { "dkim_algo", vtype_dkim, (void *)DKIM_ALGO }, |
| 527 | { "dkim_bodylength", vtype_dkim, (void *)DKIM_BODYLENGTH }, |
| 528 | { "dkim_canon_body", vtype_dkim, (void *)DKIM_CANON_BODY }, |
| 529 | { "dkim_canon_headers", vtype_dkim, (void *)DKIM_CANON_HEADERS }, |
| 530 | { "dkim_copiedheaders", vtype_dkim, (void *)DKIM_COPIEDHEADERS }, |
| 531 | { "dkim_created", vtype_dkim, (void *)DKIM_CREATED }, |
| 532 | { "dkim_cur_signer", vtype_stringptr, &dkim_cur_signer }, |
| 533 | { "dkim_domain", vtype_stringptr, &dkim_signing_domain }, |
| 534 | { "dkim_expires", vtype_dkim, (void *)DKIM_EXPIRES }, |
| 535 | { "dkim_headernames", vtype_dkim, (void *)DKIM_HEADERNAMES }, |
| 536 | { "dkim_identity", vtype_dkim, (void *)DKIM_IDENTITY }, |
| 537 | { "dkim_key_granularity",vtype_dkim, (void *)DKIM_KEY_GRANULARITY }, |
| 538 | { "dkim_key_length", vtype_int, &dkim_key_length }, |
| 539 | { "dkim_key_nosubdomains",vtype_dkim, (void *)DKIM_NOSUBDOMAINS }, |
| 540 | { "dkim_key_notes", vtype_dkim, (void *)DKIM_KEY_NOTES }, |
| 541 | { "dkim_key_srvtype", vtype_dkim, (void *)DKIM_KEY_SRVTYPE }, |
| 542 | { "dkim_key_testing", vtype_dkim, (void *)DKIM_KEY_TESTING }, |
| 543 | { "dkim_selector", vtype_stringptr, &dkim_signing_selector }, |
| 544 | { "dkim_signers", vtype_stringptr, &dkim_signers }, |
| 545 | { "dkim_verify_reason", vtype_stringptr, &dkim_verify_reason }, |
| 546 | { "dkim_verify_status", vtype_stringptr, &dkim_verify_status }, |
| 547 | #endif |
| 548 | #ifdef SUPPORT_DMARC |
| 549 | { "dmarc_domain_policy", vtype_stringptr, &dmarc_domain_policy }, |
| 550 | { "dmarc_status", vtype_stringptr, &dmarc_status }, |
| 551 | { "dmarc_status_text", vtype_stringptr, &dmarc_status_text }, |
| 552 | { "dmarc_used_domain", vtype_stringptr, &dmarc_used_domain }, |
| 553 | #endif |
| 554 | { "dnslist_domain", vtype_stringptr, &dnslist_domain }, |
| 555 | { "dnslist_matched", vtype_stringptr, &dnslist_matched }, |
| 556 | { "dnslist_text", vtype_stringptr, &dnslist_text }, |
| 557 | { "dnslist_value", vtype_stringptr, &dnslist_value }, |
| 558 | { "domain", vtype_stringptr, &deliver_domain }, |
| 559 | { "domain_data", vtype_stringptr, &deliver_domain_data }, |
| 560 | #ifndef DISABLE_EVENT |
| 561 | { "event_data", vtype_stringptr, &event_data }, |
| 562 | |
| 563 | /*XXX want to use generic vars for as many of these as possible*/ |
| 564 | { "event_defer_errno", vtype_int, &event_defer_errno }, |
| 565 | |
| 566 | { "event_name", vtype_stringptr, &event_name }, |
| 567 | #endif |
| 568 | { "exim_gid", vtype_gid, &exim_gid }, |
| 569 | { "exim_path", vtype_stringptr, &exim_path }, |
| 570 | { "exim_uid", vtype_uid, &exim_uid }, |
| 571 | { "exim_version", vtype_stringptr, &version_string }, |
| 572 | { "headers_added", vtype_string_func, (void *) &fn_hdrs_added }, |
| 573 | { "home", vtype_stringptr, &deliver_home }, |
| 574 | { "host", vtype_stringptr, &deliver_host }, |
| 575 | { "host_address", vtype_stringptr, &deliver_host_address }, |
| 576 | { "host_data", vtype_stringptr, &host_data }, |
| 577 | { "host_lookup_deferred",vtype_int, &host_lookup_deferred }, |
| 578 | { "host_lookup_failed", vtype_int, &host_lookup_failed }, |
| 579 | { "host_port", vtype_int, &deliver_host_port }, |
| 580 | { "initial_cwd", vtype_stringptr, &initial_cwd }, |
| 581 | { "inode", vtype_ino, &deliver_inode }, |
| 582 | { "interface_address", vtype_stringptr, &interface_address }, |
| 583 | { "interface_port", vtype_int, &interface_port }, |
| 584 | { "item", vtype_stringptr, &iterate_item }, |
| 585 | #ifdef LOOKUP_LDAP |
| 586 | { "ldap_dn", vtype_stringptr, &eldap_dn }, |
| 587 | #endif |
| 588 | { "load_average", vtype_load_avg, NULL }, |
| 589 | { "local_part", vtype_stringptr, &deliver_localpart }, |
| 590 | { "local_part_data", vtype_stringptr, &deliver_localpart_data }, |
| 591 | { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix }, |
| 592 | { "local_part_prefix_v", vtype_stringptr, &deliver_localpart_prefix_v }, |
| 593 | { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix }, |
| 594 | { "local_part_suffix_v", vtype_stringptr, &deliver_localpart_suffix_v }, |
| 595 | { "local_part_verified", vtype_stringptr, &deliver_localpart_verified }, |
| 596 | #ifdef HAVE_LOCAL_SCAN |
| 597 | { "local_scan_data", vtype_stringptr, &local_scan_data }, |
| 598 | #endif |
| 599 | { "local_user_gid", vtype_gid, &local_user_gid }, |
| 600 | { "local_user_uid", vtype_uid, &local_user_uid }, |
| 601 | { "localhost_number", vtype_int, &host_number }, |
| 602 | { "log_inodes", vtype_pinodes, (void *)FALSE }, |
| 603 | { "log_space", vtype_pspace, (void *)FALSE }, |
| 604 | { "lookup_dnssec_authenticated",vtype_stringptr,&lookup_dnssec_authenticated}, |
| 605 | { "mailstore_basename", vtype_stringptr, &mailstore_basename }, |
| 606 | #ifdef WITH_CONTENT_SCAN |
| 607 | { "malware_name", vtype_stringptr, &malware_name }, |
| 608 | #endif |
| 609 | { "max_received_linelength", vtype_int, &max_received_linelength }, |
| 610 | { "message_age", vtype_int, &message_age }, |
| 611 | { "message_body", vtype_msgbody, &message_body }, |
| 612 | { "message_body_end", vtype_msgbody_end, &message_body_end }, |
| 613 | { "message_body_size", vtype_int, &message_body_size }, |
| 614 | { "message_exim_id", vtype_stringptr, &message_id }, |
| 615 | { "message_headers", vtype_msgheaders, NULL }, |
| 616 | { "message_headers_raw", vtype_msgheaders_raw, NULL }, |
| 617 | { "message_id", vtype_stringptr, &message_id }, |
| 618 | { "message_linecount", vtype_int, &message_linecount }, |
| 619 | { "message_size", vtype_int, &message_size }, |
| 620 | #ifdef SUPPORT_I18N |
| 621 | { "message_smtputf8", vtype_bool, &message_smtputf8 }, |
| 622 | #endif |
| 623 | #ifdef WITH_CONTENT_SCAN |
| 624 | { "mime_anomaly_level", vtype_int, &mime_anomaly_level }, |
| 625 | { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text }, |
| 626 | { "mime_boundary", vtype_stringptr, &mime_boundary }, |
| 627 | { "mime_charset", vtype_stringptr, &mime_charset }, |
| 628 | { "mime_content_description", vtype_stringptr, &mime_content_description }, |
| 629 | { "mime_content_disposition", vtype_stringptr, &mime_content_disposition }, |
| 630 | { "mime_content_id", vtype_stringptr, &mime_content_id }, |
| 631 | { "mime_content_size", vtype_int, &mime_content_size }, |
| 632 | { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding }, |
| 633 | { "mime_content_type", vtype_stringptr, &mime_content_type }, |
| 634 | { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename }, |
| 635 | { "mime_filename", vtype_stringptr, &mime_filename }, |
| 636 | { "mime_is_coverletter", vtype_int, &mime_is_coverletter }, |
| 637 | { "mime_is_multipart", vtype_int, &mime_is_multipart }, |
| 638 | { "mime_is_rfc822", vtype_int, &mime_is_rfc822 }, |
| 639 | { "mime_part_count", vtype_int, &mime_part_count }, |
| 640 | #endif |
| 641 | { "n0", vtype_filter_int, &filter_n[0] }, |
| 642 | { "n1", vtype_filter_int, &filter_n[1] }, |
| 643 | { "n2", vtype_filter_int, &filter_n[2] }, |
| 644 | { "n3", vtype_filter_int, &filter_n[3] }, |
| 645 | { "n4", vtype_filter_int, &filter_n[4] }, |
| 646 | { "n5", vtype_filter_int, &filter_n[5] }, |
| 647 | { "n6", vtype_filter_int, &filter_n[6] }, |
| 648 | { "n7", vtype_filter_int, &filter_n[7] }, |
| 649 | { "n8", vtype_filter_int, &filter_n[8] }, |
| 650 | { "n9", vtype_filter_int, &filter_n[9] }, |
| 651 | { "original_domain", vtype_stringptr, &deliver_domain_orig }, |
| 652 | { "original_local_part", vtype_stringptr, &deliver_localpart_orig }, |
| 653 | { "originator_gid", vtype_gid, &originator_gid }, |
| 654 | { "originator_uid", vtype_uid, &originator_uid }, |
| 655 | { "parent_domain", vtype_stringptr, &deliver_domain_parent }, |
| 656 | { "parent_local_part", vtype_stringptr, &deliver_localpart_parent }, |
| 657 | { "pid", vtype_pid, NULL }, |
| 658 | #ifndef DISABLE_PRDR |
| 659 | { "prdr_requested", vtype_bool, &prdr_requested }, |
| 660 | #endif |
| 661 | { "primary_hostname", vtype_stringptr, &primary_hostname }, |
| 662 | #if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS) |
| 663 | { "proxy_external_address",vtype_stringptr, &proxy_external_address }, |
| 664 | { "proxy_external_port", vtype_int, &proxy_external_port }, |
| 665 | { "proxy_local_address", vtype_stringptr, &proxy_local_address }, |
| 666 | { "proxy_local_port", vtype_int, &proxy_local_port }, |
| 667 | { "proxy_session", vtype_bool, &proxy_session }, |
| 668 | #endif |
| 669 | { "prvscheck_address", vtype_stringptr, &prvscheck_address }, |
| 670 | { "prvscheck_keynum", vtype_stringptr, &prvscheck_keynum }, |
| 671 | { "prvscheck_result", vtype_stringptr, &prvscheck_result }, |
| 672 | { "qualify_domain", vtype_stringptr, &qualify_domain_sender }, |
| 673 | { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient }, |
| 674 | { "queue_name", vtype_stringptr, &queue_name }, |
| 675 | { "queue_size", vtype_string_func, &fn_queue_size }, |
| 676 | { "rcpt_count", vtype_int, &rcpt_count }, |
| 677 | { "rcpt_defer_count", vtype_int, &rcpt_defer_count }, |
| 678 | { "rcpt_fail_count", vtype_int, &rcpt_fail_count }, |
| 679 | { "received_count", vtype_int, &received_count }, |
| 680 | { "received_for", vtype_stringptr, &received_for }, |
| 681 | { "received_ip_address", vtype_stringptr, &interface_address }, |
| 682 | { "received_port", vtype_int, &interface_port }, |
| 683 | { "received_protocol", vtype_stringptr, &received_protocol }, |
| 684 | { "received_time", vtype_int, &received_time.tv_sec }, |
| 685 | { "recipient_data", vtype_stringptr, &recipient_data }, |
| 686 | { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure }, |
| 687 | { "recipients", vtype_string_func, (void *) &fn_recipients }, |
| 688 | { "recipients_count", vtype_int, &recipients_count }, |
| 689 | #ifdef WITH_CONTENT_SCAN |
| 690 | { "regex_match_string", vtype_stringptr, ®ex_match_string }, |
| 691 | #endif |
| 692 | { "reply_address", vtype_reply, NULL }, |
| 693 | { "return_path", vtype_stringptr, &return_path }, |
| 694 | { "return_size_limit", vtype_int, &bounce_return_size_limit }, |
| 695 | { "router_name", vtype_stringptr, &router_name }, |
| 696 | { "runrc", vtype_int, &runrc }, |
| 697 | { "self_hostname", vtype_stringptr, &self_hostname }, |
| 698 | { "sender_address", vtype_stringptr, &sender_address }, |
| 699 | { "sender_address_data", vtype_stringptr, &sender_address_data }, |
| 700 | { "sender_address_domain", vtype_domain, &sender_address }, |
| 701 | { "sender_address_local_part", vtype_localpart, &sender_address }, |
| 702 | { "sender_data", vtype_stringptr, &sender_data }, |
| 703 | { "sender_fullhost", vtype_stringptr, &sender_fullhost }, |
| 704 | { "sender_helo_dnssec", vtype_bool, &sender_helo_dnssec }, |
| 705 | { "sender_helo_name", vtype_stringptr, &sender_helo_name }, |
| 706 | { "sender_host_address", vtype_stringptr, &sender_host_address }, |
| 707 | { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated }, |
| 708 | { "sender_host_dnssec", vtype_bool, &sender_host_dnssec }, |
| 709 | { "sender_host_name", vtype_host_lookup, NULL }, |
| 710 | { "sender_host_port", vtype_int, &sender_host_port }, |
| 711 | { "sender_ident", vtype_stringptr, &sender_ident }, |
| 712 | { "sender_rate", vtype_stringptr, &sender_rate }, |
| 713 | { "sender_rate_limit", vtype_stringptr, &sender_rate_limit }, |
| 714 | { "sender_rate_period", vtype_stringptr, &sender_rate_period }, |
| 715 | { "sender_rcvhost", vtype_stringptr, &sender_rcvhost }, |
| 716 | { "sender_verify_failure",vtype_stringptr, &sender_verify_failure }, |
| 717 | { "sending_ip_address", vtype_stringptr, &sending_ip_address }, |
| 718 | { "sending_port", vtype_int, &sending_port }, |
| 719 | { "smtp_active_hostname", vtype_stringptr, &smtp_active_hostname }, |
| 720 | { "smtp_command", vtype_stringptr, &smtp_cmd_buffer }, |
| 721 | { "smtp_command_argument", vtype_stringptr, &smtp_cmd_argument }, |
| 722 | { "smtp_command_history", vtype_string_func, (void *) &smtp_cmd_hist }, |
| 723 | { "smtp_count_at_connection_start", vtype_int, &smtp_accept_count }, |
| 724 | { "smtp_notquit_reason", vtype_stringptr, &smtp_notquit_reason }, |
| 725 | { "sn0", vtype_filter_int, &filter_sn[0] }, |
| 726 | { "sn1", vtype_filter_int, &filter_sn[1] }, |
| 727 | { "sn2", vtype_filter_int, &filter_sn[2] }, |
| 728 | { "sn3", vtype_filter_int, &filter_sn[3] }, |
| 729 | { "sn4", vtype_filter_int, &filter_sn[4] }, |
| 730 | { "sn5", vtype_filter_int, &filter_sn[5] }, |
| 731 | { "sn6", vtype_filter_int, &filter_sn[6] }, |
| 732 | { "sn7", vtype_filter_int, &filter_sn[7] }, |
| 733 | { "sn8", vtype_filter_int, &filter_sn[8] }, |
| 734 | { "sn9", vtype_filter_int, &filter_sn[9] }, |
| 735 | #ifdef WITH_CONTENT_SCAN |
| 736 | { "spam_action", vtype_stringptr, &spam_action }, |
| 737 | { "spam_bar", vtype_stringptr, &spam_bar }, |
| 738 | { "spam_report", vtype_stringptr, &spam_report }, |
| 739 | { "spam_score", vtype_stringptr, &spam_score }, |
| 740 | { "spam_score_int", vtype_stringptr, &spam_score_int }, |
| 741 | #endif |
| 742 | #ifdef SUPPORT_SPF |
| 743 | { "spf_guess", vtype_stringptr, &spf_guess }, |
| 744 | { "spf_header_comment", vtype_stringptr, &spf_header_comment }, |
| 745 | { "spf_received", vtype_stringptr, &spf_received }, |
| 746 | { "spf_result", vtype_stringptr, &spf_result }, |
| 747 | { "spf_result_guessed", vtype_bool, &spf_result_guessed }, |
| 748 | { "spf_smtp_comment", vtype_stringptr, &spf_smtp_comment }, |
| 749 | #endif |
| 750 | { "spool_directory", vtype_stringptr, &spool_directory }, |
| 751 | { "spool_inodes", vtype_pinodes, (void *)TRUE }, |
| 752 | { "spool_space", vtype_pspace, (void *)TRUE }, |
| 753 | #ifdef EXPERIMENTAL_SRS |
| 754 | { "srs_db_address", vtype_stringptr, &srs_db_address }, |
| 755 | { "srs_db_key", vtype_stringptr, &srs_db_key }, |
| 756 | { "srs_orig_recipient", vtype_stringptr, &srs_orig_recipient }, |
| 757 | { "srs_orig_sender", vtype_stringptr, &srs_orig_sender }, |
| 758 | #endif |
| 759 | #if defined(EXPERIMENTAL_SRS) || defined(EXPERIMENTAL_SRS_NATIVE) |
| 760 | { "srs_recipient", vtype_stringptr, &srs_recipient }, |
| 761 | #endif |
| 762 | #ifdef EXPERIMENTAL_SRS |
| 763 | { "srs_status", vtype_stringptr, &srs_status }, |
| 764 | #endif |
| 765 | { "thisaddress", vtype_stringptr, &filter_thisaddress }, |
| 766 | |
| 767 | /* The non-(in,out) variables are now deprecated */ |
| 768 | { "tls_bits", vtype_int, &tls_in.bits }, |
| 769 | { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified }, |
| 770 | { "tls_cipher", vtype_stringptr, &tls_in.cipher }, |
| 771 | |
| 772 | { "tls_in_bits", vtype_int, &tls_in.bits }, |
| 773 | { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified }, |
| 774 | { "tls_in_cipher", vtype_stringptr, &tls_in.cipher }, |
| 775 | { "tls_in_cipher_std", vtype_stringptr, &tls_in.cipher_stdname }, |
| 776 | { "tls_in_ocsp", vtype_int, &tls_in.ocsp }, |
| 777 | { "tls_in_ourcert", vtype_cert, &tls_in.ourcert }, |
| 778 | { "tls_in_peercert", vtype_cert, &tls_in.peercert }, |
| 779 | { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn }, |
| 780 | #ifdef EXPERIMENTAL_TLS_RESUME |
| 781 | { "tls_in_resumption", vtype_int, &tls_in.resumption }, |
| 782 | #endif |
| 783 | #ifndef DISABLE_TLS |
| 784 | { "tls_in_sni", vtype_stringptr, &tls_in.sni }, |
| 785 | #endif |
| 786 | { "tls_in_ver", vtype_stringptr, &tls_in.ver }, |
| 787 | { "tls_out_bits", vtype_int, &tls_out.bits }, |
| 788 | { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified }, |
| 789 | { "tls_out_cipher", vtype_stringptr, &tls_out.cipher }, |
| 790 | { "tls_out_cipher_std", vtype_stringptr, &tls_out.cipher_stdname }, |
| 791 | #ifdef SUPPORT_DANE |
| 792 | { "tls_out_dane", vtype_bool, &tls_out.dane_verified }, |
| 793 | #endif |
| 794 | { "tls_out_ocsp", vtype_int, &tls_out.ocsp }, |
| 795 | { "tls_out_ourcert", vtype_cert, &tls_out.ourcert }, |
| 796 | { "tls_out_peercert", vtype_cert, &tls_out.peercert }, |
| 797 | { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn }, |
| 798 | #ifdef EXPERIMENTAL_TLS_RESUME |
| 799 | { "tls_out_resumption", vtype_int, &tls_out.resumption }, |
| 800 | #endif |
| 801 | #ifndef DISABLE_TLS |
| 802 | { "tls_out_sni", vtype_stringptr, &tls_out.sni }, |
| 803 | #endif |
| 804 | #ifdef SUPPORT_DANE |
| 805 | { "tls_out_tlsa_usage", vtype_int, &tls_out.tlsa_usage }, |
| 806 | #endif |
| 807 | { "tls_out_ver", vtype_stringptr, &tls_out.ver }, |
| 808 | |
| 809 | { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */ |
| 810 | #ifndef DISABLE_TLS |
| 811 | { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */ |
| 812 | #endif |
| 813 | |
| 814 | { "tod_bsdinbox", vtype_todbsdin, NULL }, |
| 815 | { "tod_epoch", vtype_tode, NULL }, |
| 816 | { "tod_epoch_l", vtype_todel, NULL }, |
| 817 | { "tod_full", vtype_todf, NULL }, |
| 818 | { "tod_log", vtype_todl, NULL }, |
| 819 | { "tod_logfile", vtype_todlf, NULL }, |
| 820 | { "tod_zone", vtype_todzone, NULL }, |
| 821 | { "tod_zulu", vtype_todzulu, NULL }, |
| 822 | { "transport_name", vtype_stringptr, &transport_name }, |
| 823 | { "value", vtype_stringptr, &lookup_value }, |
| 824 | { "verify_mode", vtype_stringptr, &verify_mode }, |
| 825 | { "version_number", vtype_stringptr, &version_string }, |
| 826 | { "warn_message_delay", vtype_stringptr, &warnmsg_delay }, |
| 827 | { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients }, |
| 828 | { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients }, |
| 829 | { "warnmsg_delay", vtype_stringptr, &warnmsg_delay }, |
| 830 | { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients }, |
| 831 | { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients } |
| 832 | }; |
| 833 | |
| 834 | static int var_table_size = nelem(var_table); |
| 835 | static uschar var_buffer[256]; |
| 836 | static BOOL malformed_header; |
| 837 | |
| 838 | /* For textual hashes */ |
| 839 | |
| 840 | static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz" |
| 841 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| 842 | "0123456789"; |
| 843 | |
| 844 | enum { HMAC_MD5, HMAC_SHA1 }; |
| 845 | |
| 846 | /* For numeric hashes */ |
| 847 | |
| 848 | static unsigned int prime[] = { |
| 849 | 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, |
| 850 | 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, |
| 851 | 73, 79, 83, 89, 97, 101, 103, 107, 109, 113}; |
| 852 | |
| 853 | /* For printing modes in symbolic form */ |
| 854 | |
| 855 | static uschar *mtable_normal[] = |
| 856 | { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" }; |
| 857 | |
| 858 | static uschar *mtable_setid[] = |
| 859 | { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" }; |
| 860 | |
| 861 | static uschar *mtable_sticky[] = |
| 862 | { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" }; |
| 863 | |
| 864 | /* flags for find_header() */ |
| 865 | #define FH_EXISTS_ONLY BIT(0) |
| 866 | #define FH_WANT_RAW BIT(1) |
| 867 | #define FH_WANT_LIST BIT(2) |
| 868 | |
| 869 | |
| 870 | /************************************************* |
| 871 | * Tables for UTF-8 support * |
| 872 | *************************************************/ |
| 873 | |
| 874 | /* Table of the number of extra characters, indexed by the first character |
| 875 | masked with 0x3f. The highest number for a valid UTF-8 character is in fact |
| 876 | 0x3d. */ |
| 877 | |
| 878 | static uschar utf8_table1[] = { |
| 879 | 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, |
| 880 | 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, |
| 881 | 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, |
| 882 | 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 }; |
| 883 | |
| 884 | /* These are the masks for the data bits in the first byte of a character, |
| 885 | indexed by the number of additional bytes. */ |
| 886 | |
| 887 | static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01}; |
| 888 | |
| 889 | /* Get the next UTF-8 character, advancing the pointer. */ |
| 890 | |
| 891 | #define GETUTF8INC(c, ptr) \ |
| 892 | c = *ptr++; \ |
| 893 | if ((c & 0xc0) == 0xc0) \ |
| 894 | { \ |
| 895 | int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \ |
| 896 | int s = 6*a; \ |
| 897 | c = (c & utf8_table2[a]) << s; \ |
| 898 | while (a-- > 0) \ |
| 899 | { \ |
| 900 | s -= 6; \ |
| 901 | c |= (*ptr++ & 0x3f) << s; \ |
| 902 | } \ |
| 903 | } |
| 904 | |
| 905 | |
| 906 | |
| 907 | static uschar * base32_chars = US"abcdefghijklmnopqrstuvwxyz234567"; |
| 908 | |
| 909 | /************************************************* |
| 910 | * Binary chop search on a table * |
| 911 | *************************************************/ |
| 912 | |
| 913 | /* This is used for matching expansion items and operators. |
| 914 | |
| 915 | Arguments: |
| 916 | name the name that is being sought |
| 917 | table the table to search |
| 918 | table_size the number of items in the table |
| 919 | |
| 920 | Returns: the offset in the table, or -1 |
| 921 | */ |
| 922 | |
| 923 | static int |
| 924 | chop_match(uschar *name, uschar **table, int table_size) |
| 925 | { |
| 926 | uschar **bot = table; |
| 927 | uschar **top = table + table_size; |
| 928 | |
| 929 | while (top > bot) |
| 930 | { |
| 931 | uschar **mid = bot + (top - bot)/2; |
| 932 | int c = Ustrcmp(name, *mid); |
| 933 | if (c == 0) return mid - table; |
| 934 | if (c > 0) bot = mid + 1; else top = mid; |
| 935 | } |
| 936 | |
| 937 | return -1; |
| 938 | } |
| 939 | |
| 940 | |
| 941 | |
| 942 | /************************************************* |
| 943 | * Check a condition string * |
| 944 | *************************************************/ |
| 945 | |
| 946 | /* This function is called to expand a string, and test the result for a "true" |
| 947 | or "false" value. Failure of the expansion yields FALSE; logged unless it was a |
| 948 | forced fail or lookup defer. |
| 949 | |
| 950 | We used to release all store used, but this is not not safe due |
| 951 | to ${dlfunc } and ${acl }. In any case expand_string_internal() |
| 952 | is reasonably careful to release what it can. |
| 953 | |
| 954 | The actual false-value tests should be replicated for ECOND_BOOL_LAX. |
| 955 | |
| 956 | Arguments: |
| 957 | condition the condition string |
| 958 | m1 text to be incorporated in panic error |
| 959 | m2 ditto |
| 960 | |
| 961 | Returns: TRUE if condition is met, FALSE if not |
| 962 | */ |
| 963 | |
| 964 | BOOL |
| 965 | expand_check_condition(uschar *condition, uschar *m1, uschar *m2) |
| 966 | { |
| 967 | uschar * ss = expand_string(condition); |
| 968 | if (!ss) |
| 969 | { |
| 970 | if (!f.expand_string_forcedfail && !f.search_find_defer) |
| 971 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" " |
| 972 | "for %s %s: %s", condition, m1, m2, expand_string_message); |
| 973 | return FALSE; |
| 974 | } |
| 975 | return *ss && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 && |
| 976 | strcmpic(ss, US"false") != 0; |
| 977 | } |
| 978 | |
| 979 | |
| 980 | |
| 981 | |
| 982 | /************************************************* |
| 983 | * Pseudo-random number generation * |
| 984 | *************************************************/ |
| 985 | |
| 986 | /* Pseudo-random number generation. The result is not "expected" to be |
| 987 | cryptographically strong but not so weak that someone will shoot themselves |
| 988 | in the foot using it as a nonce in some email header scheme or whatever |
| 989 | weirdness they'll twist this into. The result should ideally handle fork(). |
| 990 | |
| 991 | However, if we're stuck unable to provide this, then we'll fall back to |
| 992 | appallingly bad randomness. |
| 993 | |
| 994 | If DISABLE_TLS is not defined then this will not be used except as an emergency |
| 995 | fallback. |
| 996 | |
| 997 | Arguments: |
| 998 | max range maximum |
| 999 | Returns a random number in range [0, max-1] |
| 1000 | */ |
| 1001 | |
| 1002 | #ifndef DISABLE_TLS |
| 1003 | # define vaguely_random_number vaguely_random_number_fallback |
| 1004 | #endif |
| 1005 | int |
| 1006 | vaguely_random_number(int max) |
| 1007 | { |
| 1008 | #ifndef DISABLE_TLS |
| 1009 | # undef vaguely_random_number |
| 1010 | #endif |
| 1011 | static pid_t pid = 0; |
| 1012 | pid_t p2; |
| 1013 | |
| 1014 | if ((p2 = getpid()) != pid) |
| 1015 | { |
| 1016 | if (pid != 0) |
| 1017 | { |
| 1018 | |
| 1019 | #ifdef HAVE_ARC4RANDOM |
| 1020 | /* cryptographically strong randomness, common on *BSD platforms, not |
| 1021 | so much elsewhere. Alas. */ |
| 1022 | # ifndef NOT_HAVE_ARC4RANDOM_STIR |
| 1023 | arc4random_stir(); |
| 1024 | # endif |
| 1025 | #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV) |
| 1026 | # ifdef HAVE_SRANDOMDEV |
| 1027 | /* uses random(4) for seeding */ |
| 1028 | srandomdev(); |
| 1029 | # else |
| 1030 | { |
| 1031 | struct timeval tv; |
| 1032 | gettimeofday(&tv, NULL); |
| 1033 | srandom(tv.tv_sec | tv.tv_usec | getpid()); |
| 1034 | } |
| 1035 | # endif |
| 1036 | #else |
| 1037 | /* Poor randomness and no seeding here */ |
| 1038 | #endif |
| 1039 | |
| 1040 | } |
| 1041 | pid = p2; |
| 1042 | } |
| 1043 | |
| 1044 | #ifdef HAVE_ARC4RANDOM |
| 1045 | return arc4random() % max; |
| 1046 | #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV) |
| 1047 | return random() % max; |
| 1048 | #else |
| 1049 | /* This one returns a 16-bit number, definitely not crypto-strong */ |
| 1050 | return random_number(max); |
| 1051 | #endif |
| 1052 | } |
| 1053 | |
| 1054 | |
| 1055 | |
| 1056 | |
| 1057 | /************************************************* |
| 1058 | * Pick out a name from a string * |
| 1059 | *************************************************/ |
| 1060 | |
| 1061 | /* If the name is too long, it is silently truncated. |
| 1062 | |
| 1063 | Arguments: |
| 1064 | name points to a buffer into which to put the name |
| 1065 | max is the length of the buffer |
| 1066 | s points to the first alphabetic character of the name |
| 1067 | extras chars other than alphanumerics to permit |
| 1068 | |
| 1069 | Returns: pointer to the first character after the name |
| 1070 | |
| 1071 | Note: The test for *s != 0 in the while loop is necessary because |
| 1072 | Ustrchr() yields non-NULL if the character is zero (which is not something |
| 1073 | I expected). */ |
| 1074 | |
| 1075 | static const uschar * |
| 1076 | read_name(uschar *name, int max, const uschar *s, uschar *extras) |
| 1077 | { |
| 1078 | int ptr = 0; |
| 1079 | while (*s && (isalnum(*s) || Ustrchr(extras, *s) != NULL)) |
| 1080 | { |
| 1081 | if (ptr < max-1) name[ptr++] = *s; |
| 1082 | s++; |
| 1083 | } |
| 1084 | name[ptr] = 0; |
| 1085 | return s; |
| 1086 | } |
| 1087 | |
| 1088 | |
| 1089 | |
| 1090 | /************************************************* |
| 1091 | * Pick out the rest of a header name * |
| 1092 | *************************************************/ |
| 1093 | |
| 1094 | /* A variable name starting $header_ (or just $h_ for those who like |
| 1095 | abbreviations) might not be the complete header name because headers can |
| 1096 | contain any printing characters in their names, except ':'. This function is |
| 1097 | called to read the rest of the name, chop h[eader]_ off the front, and put ':' |
| 1098 | on the end, if the name was terminated by white space. |
| 1099 | |
| 1100 | Arguments: |
| 1101 | name points to a buffer in which the name read so far exists |
| 1102 | max is the length of the buffer |
| 1103 | s points to the first character after the name so far, i.e. the |
| 1104 | first non-alphameric character after $header_xxxxx |
| 1105 | |
| 1106 | Returns: a pointer to the first character after the header name |
| 1107 | */ |
| 1108 | |
| 1109 | static const uschar * |
| 1110 | read_header_name(uschar *name, int max, const uschar *s) |
| 1111 | { |
| 1112 | int prelen = Ustrchr(name, '_') - name + 1; |
| 1113 | int ptr = Ustrlen(name) - prelen; |
| 1114 | if (ptr > 0) memmove(name, name+prelen, ptr); |
| 1115 | while (mac_isgraph(*s) && *s != ':') |
| 1116 | { |
| 1117 | if (ptr < max-1) name[ptr++] = *s; |
| 1118 | s++; |
| 1119 | } |
| 1120 | if (*s == ':') s++; |
| 1121 | name[ptr++] = ':'; |
| 1122 | name[ptr] = 0; |
| 1123 | return s; |
| 1124 | } |
| 1125 | |
| 1126 | |
| 1127 | |
| 1128 | /************************************************* |
| 1129 | * Pick out a number from a string * |
| 1130 | *************************************************/ |
| 1131 | |
| 1132 | /* Arguments: |
| 1133 | n points to an integer into which to put the number |
| 1134 | s points to the first digit of the number |
| 1135 | |
| 1136 | Returns: a pointer to the character after the last digit |
| 1137 | */ |
| 1138 | /*XXX consider expanding to int_eximarith_t. But the test for |
| 1139 | "overbig numbers" in 0002 still needs to overflow it. */ |
| 1140 | |
| 1141 | static uschar * |
| 1142 | read_number(int *n, uschar *s) |
| 1143 | { |
| 1144 | *n = 0; |
| 1145 | while (isdigit(*s)) *n = *n * 10 + (*s++ - '0'); |
| 1146 | return s; |
| 1147 | } |
| 1148 | |
| 1149 | static const uschar * |
| 1150 | read_cnumber(int *n, const uschar *s) |
| 1151 | { |
| 1152 | *n = 0; |
| 1153 | while (isdigit(*s)) *n = *n * 10 + (*s++ - '0'); |
| 1154 | return s; |
| 1155 | } |
| 1156 | |
| 1157 | |
| 1158 | |
| 1159 | /************************************************* |
| 1160 | * Extract keyed subfield from a string * |
| 1161 | *************************************************/ |
| 1162 | |
| 1163 | /* The yield is in dynamic store; NULL means that the key was not found. |
| 1164 | |
| 1165 | Arguments: |
| 1166 | key points to the name of the key |
| 1167 | s points to the string from which to extract the subfield |
| 1168 | |
| 1169 | Returns: NULL if the subfield was not found, or |
| 1170 | a pointer to the subfield's data |
| 1171 | */ |
| 1172 | |
| 1173 | static uschar * |
| 1174 | expand_getkeyed(uschar * key, const uschar * s) |
| 1175 | { |
| 1176 | int length = Ustrlen(key); |
| 1177 | while (isspace(*s)) s++; |
| 1178 | |
| 1179 | /* Loop to search for the key */ |
| 1180 | |
| 1181 | while (*s) |
| 1182 | { |
| 1183 | int dkeylength; |
| 1184 | uschar * data; |
| 1185 | const uschar * dkey = s; |
| 1186 | |
| 1187 | while (*s && *s != '=' && !isspace(*s)) s++; |
| 1188 | dkeylength = s - dkey; |
| 1189 | while (isspace(*s)) s++; |
| 1190 | if (*s == '=') while (isspace((*(++s)))); |
| 1191 | |
| 1192 | data = string_dequote(&s); |
| 1193 | if (length == dkeylength && strncmpic(key, dkey, length) == 0) |
| 1194 | return data; |
| 1195 | |
| 1196 | while (isspace(*s)) s++; |
| 1197 | } |
| 1198 | |
| 1199 | return NULL; |
| 1200 | } |
| 1201 | |
| 1202 | |
| 1203 | |
| 1204 | static var_entry * |
| 1205 | find_var_ent(uschar * name) |
| 1206 | { |
| 1207 | int first = 0; |
| 1208 | int last = var_table_size; |
| 1209 | |
| 1210 | while (last > first) |
| 1211 | { |
| 1212 | int middle = (first + last)/2; |
| 1213 | int c = Ustrcmp(name, var_table[middle].name); |
| 1214 | |
| 1215 | if (c > 0) { first = middle + 1; continue; } |
| 1216 | if (c < 0) { last = middle; continue; } |
| 1217 | return &var_table[middle]; |
| 1218 | } |
| 1219 | return NULL; |
| 1220 | } |
| 1221 | |
| 1222 | /************************************************* |
| 1223 | * Extract numbered subfield from string * |
| 1224 | *************************************************/ |
| 1225 | |
| 1226 | /* Extracts a numbered field from a string that is divided by tokens - for |
| 1227 | example a line from /etc/passwd is divided by colon characters. First field is |
| 1228 | numbered one. Negative arguments count from the right. Zero returns the whole |
| 1229 | string. Returns NULL if there are insufficient tokens in the string |
| 1230 | |
| 1231 | ***WARNING*** |
| 1232 | Modifies final argument - this is a dynamically generated string, so that's OK. |
| 1233 | |
| 1234 | Arguments: |
| 1235 | field number of field to be extracted, |
| 1236 | first field = 1, whole string = 0, last field = -1 |
| 1237 | separators characters that are used to break string into tokens |
| 1238 | s points to the string from which to extract the subfield |
| 1239 | |
| 1240 | Returns: NULL if the field was not found, |
| 1241 | a pointer to the field's data inside s (modified to add 0) |
| 1242 | */ |
| 1243 | |
| 1244 | static uschar * |
| 1245 | expand_gettokened (int field, uschar *separators, uschar *s) |
| 1246 | { |
| 1247 | int sep = 1; |
| 1248 | int count; |
| 1249 | uschar *ss = s; |
| 1250 | uschar *fieldtext = NULL; |
| 1251 | |
| 1252 | if (field == 0) return s; |
| 1253 | |
| 1254 | /* Break the line up into fields in place; for field > 0 we stop when we have |
| 1255 | done the number of fields we want. For field < 0 we continue till the end of |
| 1256 | the string, counting the number of fields. */ |
| 1257 | |
| 1258 | count = (field > 0)? field : INT_MAX; |
| 1259 | |
| 1260 | while (count-- > 0) |
| 1261 | { |
| 1262 | size_t len; |
| 1263 | |
| 1264 | /* Previous field was the last one in the string. For a positive field |
| 1265 | number, this means there are not enough fields. For a negative field number, |
| 1266 | check that there are enough, and scan back to find the one that is wanted. */ |
| 1267 | |
| 1268 | if (sep == 0) |
| 1269 | { |
| 1270 | if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL; |
| 1271 | if ((-field) == (INT_MAX - count - 1)) return s; |
| 1272 | while (field++ < 0) |
| 1273 | { |
| 1274 | ss--; |
| 1275 | while (ss[-1] != 0) ss--; |
| 1276 | } |
| 1277 | fieldtext = ss; |
| 1278 | break; |
| 1279 | } |
| 1280 | |
| 1281 | /* Previous field was not last in the string; save its start and put a |
| 1282 | zero at its end. */ |
| 1283 | |
| 1284 | fieldtext = ss; |
| 1285 | len = Ustrcspn(ss, separators); |
| 1286 | sep = ss[len]; |
| 1287 | ss[len] = 0; |
| 1288 | ss += len + 1; |
| 1289 | } |
| 1290 | |
| 1291 | return fieldtext; |
| 1292 | } |
| 1293 | |
| 1294 | |
| 1295 | static uschar * |
| 1296 | expand_getlistele(int field, const uschar * list) |
| 1297 | { |
| 1298 | const uschar * tlist = list; |
| 1299 | int sep = 0; |
| 1300 | uschar dummy; |
| 1301 | |
| 1302 | if (field < 0) |
| 1303 | { |
| 1304 | for (field++; string_nextinlist(&tlist, &sep, &dummy, 1); ) field++; |
| 1305 | sep = 0; |
| 1306 | } |
| 1307 | if (field == 0) return NULL; |
| 1308 | while (--field > 0 && (string_nextinlist(&list, &sep, &dummy, 1))) ; |
| 1309 | return string_nextinlist(&list, &sep, NULL, 0); |
| 1310 | } |
| 1311 | |
| 1312 | |
| 1313 | /* Certificate fields, by name. Worry about by-OID later */ |
| 1314 | /* Names are chosen to not have common prefixes */ |
| 1315 | |
| 1316 | #ifndef DISABLE_TLS |
| 1317 | typedef struct |
| 1318 | { |
| 1319 | uschar * name; |
| 1320 | int namelen; |
| 1321 | uschar * (*getfn)(void * cert, uschar * mod); |
| 1322 | } certfield; |
| 1323 | static certfield certfields[] = |
| 1324 | { /* linear search; no special order */ |
| 1325 | { US"version", 7, &tls_cert_version }, |
| 1326 | { US"serial_number", 13, &tls_cert_serial_number }, |
| 1327 | { US"subject", 7, &tls_cert_subject }, |
| 1328 | { US"notbefore", 9, &tls_cert_not_before }, |
| 1329 | { US"notafter", 8, &tls_cert_not_after }, |
| 1330 | { US"issuer", 6, &tls_cert_issuer }, |
| 1331 | { US"signature", 9, &tls_cert_signature }, |
| 1332 | { US"sig_algorithm", 13, &tls_cert_signature_algorithm }, |
| 1333 | { US"subj_altname", 12, &tls_cert_subject_altname }, |
| 1334 | { US"ocsp_uri", 8, &tls_cert_ocsp_uri }, |
| 1335 | { US"crl_uri", 7, &tls_cert_crl_uri }, |
| 1336 | }; |
| 1337 | |
| 1338 | static uschar * |
| 1339 | expand_getcertele(uschar * field, uschar * certvar) |
| 1340 | { |
| 1341 | var_entry * vp; |
| 1342 | |
| 1343 | if (!(vp = find_var_ent(certvar))) |
| 1344 | { |
| 1345 | expand_string_message = |
| 1346 | string_sprintf("no variable named \"%s\"", certvar); |
| 1347 | return NULL; /* Unknown variable name */ |
| 1348 | } |
| 1349 | /* NB this stops us passing certs around in variable. Might |
| 1350 | want to do that in future */ |
| 1351 | if (vp->type != vtype_cert) |
| 1352 | { |
| 1353 | expand_string_message = |
| 1354 | string_sprintf("\"%s\" is not a certificate", certvar); |
| 1355 | return NULL; /* Unknown variable name */ |
| 1356 | } |
| 1357 | if (!*(void **)vp->value) |
| 1358 | return NULL; |
| 1359 | |
| 1360 | if (*field >= '0' && *field <= '9') |
| 1361 | return tls_cert_ext_by_oid(*(void **)vp->value, field, 0); |
| 1362 | |
| 1363 | for (certfield * cp = certfields; |
| 1364 | cp < certfields + nelem(certfields); |
| 1365 | cp++) |
| 1366 | if (Ustrncmp(cp->name, field, cp->namelen) == 0) |
| 1367 | { |
| 1368 | uschar * modifier = *(field += cp->namelen) == ',' |
| 1369 | ? ++field : NULL; |
| 1370 | return (*cp->getfn)( *(void **)vp->value, modifier ); |
| 1371 | } |
| 1372 | |
| 1373 | expand_string_message = |
| 1374 | string_sprintf("bad field selector \"%s\" for certextract", field); |
| 1375 | return NULL; |
| 1376 | } |
| 1377 | #endif /*DISABLE_TLS*/ |
| 1378 | |
| 1379 | /************************************************* |
| 1380 | * Extract a substring from a string * |
| 1381 | *************************************************/ |
| 1382 | |
| 1383 | /* Perform the ${substr or ${length expansion operations. |
| 1384 | |
| 1385 | Arguments: |
| 1386 | subject the input string |
| 1387 | value1 the offset from the start of the input string to the start of |
| 1388 | the output string; if negative, count from the right. |
| 1389 | value2 the length of the output string, or negative (-1) for unset |
| 1390 | if value1 is positive, unset means "all after" |
| 1391 | if value1 is negative, unset means "all before" |
| 1392 | len set to the length of the returned string |
| 1393 | |
| 1394 | Returns: pointer to the output string, or NULL if there is an error |
| 1395 | */ |
| 1396 | |
| 1397 | static uschar * |
| 1398 | extract_substr(uschar *subject, int value1, int value2, int *len) |
| 1399 | { |
| 1400 | int sublen = Ustrlen(subject); |
| 1401 | |
| 1402 | if (value1 < 0) /* count from right */ |
| 1403 | { |
| 1404 | value1 += sublen; |
| 1405 | |
| 1406 | /* If the position is before the start, skip to the start, and adjust the |
| 1407 | length. If the length ends up negative, the substring is null because nothing |
| 1408 | can precede. This falls out naturally when the length is unset, meaning "all |
| 1409 | to the left". */ |
| 1410 | |
| 1411 | if (value1 < 0) |
| 1412 | { |
| 1413 | value2 += value1; |
| 1414 | if (value2 < 0) value2 = 0; |
| 1415 | value1 = 0; |
| 1416 | } |
| 1417 | |
| 1418 | /* Otherwise an unset length => characters before value1 */ |
| 1419 | |
| 1420 | else if (value2 < 0) |
| 1421 | { |
| 1422 | value2 = value1; |
| 1423 | value1 = 0; |
| 1424 | } |
| 1425 | } |
| 1426 | |
| 1427 | /* For a non-negative offset, if the starting position is past the end of the |
| 1428 | string, the result will be the null string. Otherwise, an unset length means |
| 1429 | "rest"; just set it to the maximum - it will be cut down below if necessary. */ |
| 1430 | |
| 1431 | else |
| 1432 | { |
| 1433 | if (value1 > sublen) |
| 1434 | { |
| 1435 | value1 = sublen; |
| 1436 | value2 = 0; |
| 1437 | } |
| 1438 | else if (value2 < 0) value2 = sublen; |
| 1439 | } |
| 1440 | |
| 1441 | /* Cut the length down to the maximum possible for the offset value, and get |
| 1442 | the required characters. */ |
| 1443 | |
| 1444 | if (value1 + value2 > sublen) value2 = sublen - value1; |
| 1445 | *len = value2; |
| 1446 | return subject + value1; |
| 1447 | } |
| 1448 | |
| 1449 | |
| 1450 | |
| 1451 | |
| 1452 | /************************************************* |
| 1453 | * Old-style hash of a string * |
| 1454 | *************************************************/ |
| 1455 | |
| 1456 | /* Perform the ${hash expansion operation. |
| 1457 | |
| 1458 | Arguments: |
| 1459 | subject the input string (an expanded substring) |
| 1460 | value1 the length of the output string; if greater or equal to the |
| 1461 | length of the input string, the input string is returned |
| 1462 | value2 the number of hash characters to use, or 26 if negative |
| 1463 | len set to the length of the returned string |
| 1464 | |
| 1465 | Returns: pointer to the output string, or NULL if there is an error |
| 1466 | */ |
| 1467 | |
| 1468 | static uschar * |
| 1469 | compute_hash(uschar *subject, int value1, int value2, int *len) |
| 1470 | { |
| 1471 | int sublen = Ustrlen(subject); |
| 1472 | |
| 1473 | if (value2 < 0) value2 = 26; |
| 1474 | else if (value2 > Ustrlen(hashcodes)) |
| 1475 | { |
| 1476 | expand_string_message = |
| 1477 | string_sprintf("hash count \"%d\" too big", value2); |
| 1478 | return NULL; |
| 1479 | } |
| 1480 | |
| 1481 | /* Calculate the hash text. We know it is shorter than the original string, so |
| 1482 | can safely place it in subject[] (we know that subject is always itself an |
| 1483 | expanded substring). */ |
| 1484 | |
| 1485 | if (value1 < sublen) |
| 1486 | { |
| 1487 | int c; |
| 1488 | int i = 0; |
| 1489 | int j = value1; |
| 1490 | while ((c = (subject[j])) != 0) |
| 1491 | { |
| 1492 | int shift = (c + j++) & 7; |
| 1493 | subject[i] ^= (c << shift) | (c >> (8-shift)); |
| 1494 | if (++i >= value1) i = 0; |
| 1495 | } |
| 1496 | for (i = 0; i < value1; i++) |
| 1497 | subject[i] = hashcodes[(subject[i]) % value2]; |
| 1498 | } |
| 1499 | else value1 = sublen; |
| 1500 | |
| 1501 | *len = value1; |
| 1502 | return subject; |
| 1503 | } |
| 1504 | |
| 1505 | |
| 1506 | |
| 1507 | |
| 1508 | /************************************************* |
| 1509 | * Numeric hash of a string * |
| 1510 | *************************************************/ |
| 1511 | |
| 1512 | /* Perform the ${nhash expansion operation. The first characters of the |
| 1513 | string are treated as most important, and get the highest prime numbers. |
| 1514 | |
| 1515 | Arguments: |
| 1516 | subject the input string |
| 1517 | value1 the maximum value of the first part of the result |
| 1518 | value2 the maximum value of the second part of the result, |
| 1519 | or negative to produce only a one-part result |
| 1520 | len set to the length of the returned string |
| 1521 | |
| 1522 | Returns: pointer to the output string, or NULL if there is an error. |
| 1523 | */ |
| 1524 | |
| 1525 | static uschar * |
| 1526 | compute_nhash (uschar *subject, int value1, int value2, int *len) |
| 1527 | { |
| 1528 | uschar *s = subject; |
| 1529 | int i = 0; |
| 1530 | unsigned long int total = 0; /* no overflow */ |
| 1531 | |
| 1532 | while (*s != 0) |
| 1533 | { |
| 1534 | if (i == 0) i = nelem(prime) - 1; |
| 1535 | total += prime[i--] * (unsigned int)(*s++); |
| 1536 | } |
| 1537 | |
| 1538 | /* If value2 is unset, just compute one number */ |
| 1539 | |
| 1540 | if (value2 < 0) |
| 1541 | s = string_sprintf("%lu", total % value1); |
| 1542 | |
| 1543 | /* Otherwise do a div/mod hash */ |
| 1544 | |
| 1545 | else |
| 1546 | { |
| 1547 | total = total % (value1 * value2); |
| 1548 | s = string_sprintf("%lu/%lu", total/value2, total % value2); |
| 1549 | } |
| 1550 | |
| 1551 | *len = Ustrlen(s); |
| 1552 | return s; |
| 1553 | } |
| 1554 | |
| 1555 | |
| 1556 | |
| 1557 | |
| 1558 | |
| 1559 | /************************************************* |
| 1560 | * Find the value of a header or headers * |
| 1561 | *************************************************/ |
| 1562 | |
| 1563 | /* Multiple instances of the same header get concatenated, and this function |
| 1564 | can also return a concatenation of all the header lines. When concatenating |
| 1565 | specific headers that contain lists of addresses, a comma is inserted between |
| 1566 | them. Otherwise we use a straight concatenation. Because some messages can have |
| 1567 | pathologically large number of lines, there is a limit on the length that is |
| 1568 | returned. |
| 1569 | |
| 1570 | Arguments: |
| 1571 | name the name of the header, without the leading $header_ or $h_, |
| 1572 | or NULL if a concatenation of all headers is required |
| 1573 | newsize return the size of memory block that was obtained; may be NULL |
| 1574 | if exists_only is TRUE |
| 1575 | flags FH_EXISTS_ONLY |
| 1576 | set if called from a def: test; don't need to build a string; |
| 1577 | just return a string that is not "" and not "0" if the header |
| 1578 | exists |
| 1579 | FH_WANT_RAW |
| 1580 | set if called for $rh_ or $rheader_ items; no processing, |
| 1581 | other than concatenating, will be done on the header. Also used |
| 1582 | for $message_headers_raw. |
| 1583 | FH_WANT_LIST |
| 1584 | Double colon chars in the content, and replace newline with |
| 1585 | colon between each element when concatenating; returning a |
| 1586 | colon-sep list (elements might contain newlines) |
| 1587 | charset name of charset to translate MIME words to; used only if |
| 1588 | want_raw is false; if NULL, no translation is done (this is |
| 1589 | used for $bh_ and $bheader_) |
| 1590 | |
| 1591 | Returns: NULL if the header does not exist, else a pointer to a new |
| 1592 | store block |
| 1593 | */ |
| 1594 | |
| 1595 | static uschar * |
| 1596 | find_header(uschar *name, int *newsize, unsigned flags, uschar *charset) |
| 1597 | { |
| 1598 | BOOL found = !name; |
| 1599 | int len = name ? Ustrlen(name) : 0; |
| 1600 | BOOL comma = FALSE; |
| 1601 | gstring * g = NULL; |
| 1602 | |
| 1603 | for (header_line * h = header_list; h; h = h->next) |
| 1604 | if (h->type != htype_old && h->text) /* NULL => Received: placeholder */ |
| 1605 | if (!name || (len <= h->slen && strncmpic(name, h->text, len) == 0)) |
| 1606 | { |
| 1607 | uschar * s, * t; |
| 1608 | size_t inc; |
| 1609 | |
| 1610 | if (flags & FH_EXISTS_ONLY) |
| 1611 | return US"1"; /* don't need actual string */ |
| 1612 | |
| 1613 | found = TRUE; |
| 1614 | s = h->text + len; /* text to insert */ |
| 1615 | if (!(flags & FH_WANT_RAW)) /* unless wanted raw, */ |
| 1616 | while (isspace(*s)) s++; /* remove leading white space */ |
| 1617 | t = h->text + h->slen; /* end-point */ |
| 1618 | |
| 1619 | /* Unless wanted raw, remove trailing whitespace, including the |
| 1620 | newline. */ |
| 1621 | |
| 1622 | if (flags & FH_WANT_LIST) |
| 1623 | while (t > s && t[-1] == '\n') t--; |
| 1624 | else if (!(flags & FH_WANT_RAW)) |
| 1625 | { |
| 1626 | while (t > s && isspace(t[-1])) t--; |
| 1627 | |
| 1628 | /* Set comma if handling a single header and it's one of those |
| 1629 | that contains an address list, except when asked for raw headers. Only |
| 1630 | need to do this once. */ |
| 1631 | |
| 1632 | if (name && !comma && Ustrchr("BCFRST", h->type)) comma = TRUE; |
| 1633 | } |
| 1634 | |
| 1635 | /* Trim the header roughly if we're approaching limits */ |
| 1636 | inc = t - s; |
| 1637 | if (gstring_length(g) + inc > header_insert_maxlen) |
| 1638 | inc = header_insert_maxlen - gstring_length(g); |
| 1639 | |
| 1640 | /* For raw just copy the data; for a list, add the data as a colon-sep |
| 1641 | list-element; for comma-list add as an unchecked comma,newline sep |
| 1642 | list-elemment; for other nonraw add as an unchecked newline-sep list (we |
| 1643 | stripped trailing WS above including the newline). We ignore the potential |
| 1644 | expansion due to colon-doubling, just leaving the loop if the limit is met |
| 1645 | or exceeded. */ |
| 1646 | |
| 1647 | if (flags & FH_WANT_LIST) |
| 1648 | g = string_append_listele_n(g, ':', s, (unsigned)inc); |
| 1649 | else if (flags & FH_WANT_RAW) |
| 1650 | g = string_catn(g, s, (unsigned)inc); |
| 1651 | else if (inc > 0) |
| 1652 | g = string_append2_listele_n(g, comma ? US",\n" : US"\n", |
| 1653 | s, (unsigned)inc); |
| 1654 | |
| 1655 | if (gstring_length(g) >= header_insert_maxlen) break; |
| 1656 | } |
| 1657 | |
| 1658 | if (!found) return NULL; /* No header found */ |
| 1659 | if (!g) return US""; |
| 1660 | |
| 1661 | /* That's all we do for raw header expansion. */ |
| 1662 | |
| 1663 | *newsize = g->size; |
| 1664 | if (flags & FH_WANT_RAW) |
| 1665 | return string_from_gstring(g); |
| 1666 | |
| 1667 | /* Otherwise do RFC 2047 decoding, translating the charset if requested. |
| 1668 | The rfc2047_decode2() function can return an error with decoded data if the |
| 1669 | charset translation fails. If decoding fails, it returns NULL. */ |
| 1670 | |
| 1671 | else |
| 1672 | { |
| 1673 | uschar * error, * decoded = rfc2047_decode2(string_from_gstring(g), |
| 1674 | check_rfc2047_length, charset, '?', NULL, newsize, &error); |
| 1675 | if (error) |
| 1676 | DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n" |
| 1677 | " input was: %s\n", error, g->s); |
| 1678 | return decoded ? decoded : string_from_gstring(g); |
| 1679 | } |
| 1680 | } |
| 1681 | |
| 1682 | |
| 1683 | |
| 1684 | |
| 1685 | /* Append a "local" element to an Authentication-Results: header |
| 1686 | if this was a non-smtp message. |
| 1687 | */ |
| 1688 | |
| 1689 | static gstring * |
| 1690 | authres_local(gstring * g, const uschar * sysname) |
| 1691 | { |
| 1692 | if (!f.authentication_local) |
| 1693 | return g; |
| 1694 | g = string_append(g, 3, US";\n\tlocal=pass (non-smtp, ", sysname, US")"); |
| 1695 | if (authenticated_id) g = string_append(g, 2, " u=", authenticated_id); |
| 1696 | return g; |
| 1697 | } |
| 1698 | |
| 1699 | |
| 1700 | /* Append an "iprev" element to an Authentication-Results: header |
| 1701 | if we have attempted to get the calling host's name. |
| 1702 | */ |
| 1703 | |
| 1704 | static gstring * |
| 1705 | authres_iprev(gstring * g) |
| 1706 | { |
| 1707 | if (sender_host_name) |
| 1708 | g = string_append(g, 3, US";\n\tiprev=pass (", sender_host_name, US")"); |
| 1709 | else if (host_lookup_deferred) |
| 1710 | g = string_catn(g, US";\n\tiprev=temperror", 19); |
| 1711 | else if (host_lookup_failed) |
| 1712 | g = string_catn(g, US";\n\tiprev=fail", 13); |
| 1713 | else |
| 1714 | return g; |
| 1715 | |
| 1716 | if (sender_host_address) |
| 1717 | g = string_append(g, 2, US" smtp.remote-ip=", sender_host_address); |
| 1718 | return g; |
| 1719 | } |
| 1720 | |
| 1721 | |
| 1722 | |
| 1723 | /************************************************* |
| 1724 | * Return list of recipients * |
| 1725 | *************************************************/ |
| 1726 | /* A recipients list is available only during system message filtering, |
| 1727 | during ACL processing after DATA, and while expanding pipe commands |
| 1728 | generated from a system filter, but not elsewhere. */ |
| 1729 | |
| 1730 | static uschar * |
| 1731 | fn_recipients(void) |
| 1732 | { |
| 1733 | uschar * s; |
| 1734 | gstring * g = NULL; |
| 1735 | |
| 1736 | if (!f.enable_dollar_recipients) return NULL; |
| 1737 | |
| 1738 | for (int i = 0; i < recipients_count; i++) |
| 1739 | { |
| 1740 | s = recipients_list[i].address; |
| 1741 | g = string_append2_listele_n(g, US", ", s, Ustrlen(s)); |
| 1742 | } |
| 1743 | return g ? g->s : NULL; |
| 1744 | } |
| 1745 | |
| 1746 | |
| 1747 | /************************************************* |
| 1748 | * Return size of queue * |
| 1749 | *************************************************/ |
| 1750 | /* Ask the daemon for the queue size */ |
| 1751 | |
| 1752 | static uschar * |
| 1753 | fn_queue_size(void) |
| 1754 | { |
| 1755 | struct sockaddr_un sa_un = {.sun_family = AF_UNIX}; |
| 1756 | uschar buf[16]; |
| 1757 | int fd; |
| 1758 | ssize_t len; |
| 1759 | const uschar * where; |
| 1760 | #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS |
| 1761 | uschar * sname; |
| 1762 | #endif |
| 1763 | fd_set fds; |
| 1764 | struct timeval tv; |
| 1765 | |
| 1766 | if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) |
| 1767 | { |
| 1768 | DEBUG(D_expand) debug_printf(" socket: %s\n", strerror(errno)); |
| 1769 | return NULL; |
| 1770 | } |
| 1771 | |
| 1772 | #ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS |
| 1773 | sa_un.sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */ |
| 1774 | len = offsetof(struct sockaddr_un, sun_path) + 1 |
| 1775 | + snprintf(sa_un.sun_path+1, sizeof(sa_un.sun_path)-1, "exim_%d", getpid()); |
| 1776 | #else |
| 1777 | sname = string_sprintf("%s/p_%d", spool_directory, getpid()); |
| 1778 | len = offsetof(struct sockaddr_un, sun_path) |
| 1779 | + snprintf(sa_un.sun_path, sizeof(sa_un.sun_path), "%s", sname); |
| 1780 | #endif |
| 1781 | |
| 1782 | if (bind(fd, (const struct sockaddr *)&sa_un, len) < 0) |
| 1783 | { where = US"bind"; goto bad; } |
| 1784 | |
| 1785 | #ifdef notdef |
| 1786 | debug_printf("local addr '%s%s'\n", |
| 1787 | *sa_un.sun_path ? "" : "@", |
| 1788 | sa_un.sun_path + (*sa_un.sun_path ? 0 : 1)); |
| 1789 | #endif |
| 1790 | |
| 1791 | #ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS |
| 1792 | sa_un.sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */ |
| 1793 | len = offsetof(struct sockaddr_un, sun_path) + 1 |
| 1794 | + snprintf(sa_un.sun_path+1, sizeof(sa_un.sun_path)-1, "%s", |
| 1795 | expand_string(notifier_socket)); |
| 1796 | #else |
| 1797 | len = offsetof(struct sockaddr_un, sun_path) |
| 1798 | + snprintf(sa_un.sun_path, sizeof(sa_un.sun_path), "%s", |
| 1799 | expand_string(notifier_socket)); |
| 1800 | #endif |
| 1801 | |
| 1802 | if (connect(fd, (const struct sockaddr *)&sa_un, len) < 0) |
| 1803 | { where = US"connect"; goto bad2; } |
| 1804 | |
| 1805 | buf[0] = NOTIFY_QUEUE_SIZE_REQ; |
| 1806 | if (send(fd, buf, 1, 0) < 0) { where = US"send"; goto bad; } |
| 1807 | |
| 1808 | FD_ZERO(&fds); FD_SET(fd, &fds); |
| 1809 | tv.tv_sec = 2; tv.tv_usec = 0; |
| 1810 | if (select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv) != 1) |
| 1811 | { |
| 1812 | DEBUG(D_expand) debug_printf("no daemon response; using local evaluation\n"); |
| 1813 | len = snprintf(CS buf, sizeof(buf), "%u", queue_count_cached()); |
| 1814 | } |
| 1815 | else if ((len = recv(fd, buf, sizeof(buf), 0)) < 0) |
| 1816 | { where = US"recv"; goto bad2; } |
| 1817 | |
| 1818 | close(fd); |
| 1819 | #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS |
| 1820 | Uunlink(sname); |
| 1821 | #endif |
| 1822 | return string_copyn(buf, len); |
| 1823 | |
| 1824 | bad2: |
| 1825 | #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS |
| 1826 | Uunlink(sname); |
| 1827 | #endif |
| 1828 | bad: |
| 1829 | close(fd); |
| 1830 | DEBUG(D_expand) debug_printf(" %s: %s\n", where, strerror(errno)); |
| 1831 | return NULL; |
| 1832 | } |
| 1833 | |
| 1834 | |
| 1835 | /************************************************* |
| 1836 | * Find value of a variable * |
| 1837 | *************************************************/ |
| 1838 | |
| 1839 | /* The table of variables is kept in alphabetic order, so we can search it |
| 1840 | using a binary chop. The "choplen" variable is nothing to do with the binary |
| 1841 | chop. |
| 1842 | |
| 1843 | Arguments: |
| 1844 | name the name of the variable being sought |
| 1845 | exists_only TRUE if this is a def: test; passed on to find_header() |
| 1846 | skipping TRUE => skip any processing evaluation; this is not the same as |
| 1847 | exists_only because def: may test for values that are first |
| 1848 | evaluated here |
| 1849 | newsize pointer to an int which is initially zero; if the answer is in |
| 1850 | a new memory buffer, *newsize is set to its size |
| 1851 | |
| 1852 | Returns: NULL if the variable does not exist, or |
| 1853 | a pointer to the variable's contents, or |
| 1854 | something non-NULL if exists_only is TRUE |
| 1855 | */ |
| 1856 | |
| 1857 | static uschar * |
| 1858 | find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize) |
| 1859 | { |
| 1860 | var_entry * vp; |
| 1861 | uschar *s, *domain; |
| 1862 | uschar **ss; |
| 1863 | void * val; |
| 1864 | |
| 1865 | /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx. |
| 1866 | Originally, xxx had to be a number in the range 0-9 (later 0-19), but from |
| 1867 | release 4.64 onwards arbitrary names are permitted, as long as the first 5 |
| 1868 | characters are acl_c or acl_m and the sixth is either a digit or an underscore |
| 1869 | (this gave backwards compatibility at the changeover). There may be built-in |
| 1870 | variables whose names start acl_ but they should never start in this way. This |
| 1871 | slightly messy specification is a consequence of the history, needless to say. |
| 1872 | |
| 1873 | If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is |
| 1874 | set, in which case give an error. */ |
| 1875 | |
| 1876 | if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) && |
| 1877 | !isalpha(name[5])) |
| 1878 | { |
| 1879 | tree_node * node = |
| 1880 | tree_search(name[4] == 'c' ? acl_var_c : acl_var_m, name + 4); |
| 1881 | return node ? node->data.ptr : strict_acl_vars ? NULL : US""; |
| 1882 | } |
| 1883 | else if (Ustrncmp(name, "r_", 2) == 0) |
| 1884 | { |
| 1885 | tree_node * node = tree_search(router_var, name + 2); |
| 1886 | return node ? node->data.ptr : strict_acl_vars ? NULL : US""; |
| 1887 | } |
| 1888 | |
| 1889 | /* Handle $auth<n> variables. */ |
| 1890 | |
| 1891 | if (Ustrncmp(name, "auth", 4) == 0) |
| 1892 | { |
| 1893 | uschar *endptr; |
| 1894 | int n = Ustrtoul(name + 4, &endptr, 10); |
| 1895 | if (*endptr == 0 && n != 0 && n <= AUTH_VARS) |
| 1896 | return !auth_vars[n-1] ? US"" : auth_vars[n-1]; |
| 1897 | } |
| 1898 | else if (Ustrncmp(name, "regex", 5) == 0) |
| 1899 | { |
| 1900 | uschar *endptr; |
| 1901 | int n = Ustrtoul(name + 5, &endptr, 10); |
| 1902 | if (*endptr == 0 && n != 0 && n <= REGEX_VARS) |
| 1903 | return !regex_vars[n-1] ? US"" : regex_vars[n-1]; |
| 1904 | } |
| 1905 | |
| 1906 | /* For all other variables, search the table */ |
| 1907 | |
| 1908 | if (!(vp = find_var_ent(name))) |
| 1909 | return NULL; /* Unknown variable name */ |
| 1910 | |
| 1911 | /* Found an existing variable. If in skipping state, the value isn't needed, |
| 1912 | and we want to avoid processing (such as looking up the host name). */ |
| 1913 | |
| 1914 | if (skipping) |
| 1915 | return US""; |
| 1916 | |
| 1917 | val = vp->value; |
| 1918 | switch (vp->type) |
| 1919 | { |
| 1920 | case vtype_filter_int: |
| 1921 | if (!f.filter_running) return NULL; |
| 1922 | /* Fall through */ |
| 1923 | /* VVVVVVVVVVVV */ |
| 1924 | case vtype_int: |
| 1925 | sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */ |
| 1926 | return var_buffer; |
| 1927 | |
| 1928 | case vtype_ino: |
| 1929 | sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */ |
| 1930 | return var_buffer; |
| 1931 | |
| 1932 | case vtype_gid: |
| 1933 | sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */ |
| 1934 | return var_buffer; |
| 1935 | |
| 1936 | case vtype_uid: |
| 1937 | sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */ |
| 1938 | return var_buffer; |
| 1939 | |
| 1940 | case vtype_bool: |
| 1941 | sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */ |
| 1942 | return var_buffer; |
| 1943 | |
| 1944 | case vtype_stringptr: /* Pointer to string */ |
| 1945 | return (s = *((uschar **)(val))) ? s : US""; |
| 1946 | |
| 1947 | case vtype_pid: |
| 1948 | sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */ |
| 1949 | return var_buffer; |
| 1950 | |
| 1951 | case vtype_load_avg: |
| 1952 | sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */ |
| 1953 | return var_buffer; |
| 1954 | |
| 1955 | case vtype_host_lookup: /* Lookup if not done so */ |
| 1956 | if ( !sender_host_name && sender_host_address |
| 1957 | && !host_lookup_failed && host_name_lookup() == OK) |
| 1958 | host_build_sender_fullhost(); |
| 1959 | return sender_host_name ? sender_host_name : US""; |
| 1960 | |
| 1961 | case vtype_localpart: /* Get local part from address */ |
| 1962 | if (!(s = *((uschar **)(val)))) return US""; |
| 1963 | if (!(domain = Ustrrchr(s, '@'))) return s; |
| 1964 | if (domain - s > sizeof(var_buffer) - 1) |
| 1965 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT |
| 1966 | " in string expansion", sizeof(var_buffer)); |
| 1967 | return string_copyn(s, domain - s); |
| 1968 | |
| 1969 | case vtype_domain: /* Get domain from address */ |
| 1970 | if (!(s = *((uschar **)(val)))) return US""; |
| 1971 | domain = Ustrrchr(s, '@'); |
| 1972 | return domain ? domain + 1 : US""; |
| 1973 | |
| 1974 | case vtype_msgheaders: |
| 1975 | return find_header(NULL, newsize, exists_only ? FH_EXISTS_ONLY : 0, NULL); |
| 1976 | |
| 1977 | case vtype_msgheaders_raw: |
| 1978 | return find_header(NULL, newsize, |
| 1979 | exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW, NULL); |
| 1980 | |
| 1981 | case vtype_msgbody: /* Pointer to msgbody string */ |
| 1982 | case vtype_msgbody_end: /* Ditto, the end of the msg */ |
| 1983 | ss = (uschar **)(val); |
| 1984 | if (!*ss && deliver_datafile >= 0) /* Read body when needed */ |
| 1985 | { |
| 1986 | uschar *body; |
| 1987 | off_t start_offset = SPOOL_DATA_START_OFFSET; |
| 1988 | int len = message_body_visible; |
| 1989 | if (len > message_size) len = message_size; |
| 1990 | *ss = body = store_malloc(len+1); |
| 1991 | body[0] = 0; |
| 1992 | if (vp->type == vtype_msgbody_end) |
| 1993 | { |
| 1994 | struct stat statbuf; |
| 1995 | if (fstat(deliver_datafile, &statbuf) == 0) |
| 1996 | { |
| 1997 | start_offset = statbuf.st_size - len; |
| 1998 | if (start_offset < SPOOL_DATA_START_OFFSET) |
| 1999 | start_offset = SPOOL_DATA_START_OFFSET; |
| 2000 | } |
| 2001 | } |
| 2002 | if (lseek(deliver_datafile, start_offset, SEEK_SET) < 0) |
| 2003 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "deliver_datafile lseek: %s", |
| 2004 | strerror(errno)); |
| 2005 | len = read(deliver_datafile, body, len); |
| 2006 | if (len > 0) |
| 2007 | { |
| 2008 | body[len] = 0; |
| 2009 | if (message_body_newlines) /* Separate loops for efficiency */ |
| 2010 | while (len > 0) |
| 2011 | { if (body[--len] == 0) body[len] = ' '; } |
| 2012 | else |
| 2013 | while (len > 0) |
| 2014 | { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; } |
| 2015 | } |
| 2016 | } |
| 2017 | return *ss ? *ss : US""; |
| 2018 | |
| 2019 | case vtype_todbsdin: /* BSD inbox time of day */ |
| 2020 | return tod_stamp(tod_bsdin); |
| 2021 | |
| 2022 | case vtype_tode: /* Unix epoch time of day */ |
| 2023 | return tod_stamp(tod_epoch); |
| 2024 | |
| 2025 | case vtype_todel: /* Unix epoch/usec time of day */ |
| 2026 | return tod_stamp(tod_epoch_l); |
| 2027 | |
| 2028 | case vtype_todf: /* Full time of day */ |
| 2029 | return tod_stamp(tod_full); |
| 2030 | |
| 2031 | case vtype_todl: /* Log format time of day */ |
| 2032 | return tod_stamp(tod_log_bare); /* (without timezone) */ |
| 2033 | |
| 2034 | case vtype_todzone: /* Time zone offset only */ |
| 2035 | return tod_stamp(tod_zone); |
| 2036 | |
| 2037 | case vtype_todzulu: /* Zulu time */ |
| 2038 | return tod_stamp(tod_zulu); |
| 2039 | |
| 2040 | case vtype_todlf: /* Log file datestamp tod */ |
| 2041 | return tod_stamp(tod_log_datestamp_daily); |
| 2042 | |
| 2043 | case vtype_reply: /* Get reply address */ |
| 2044 | s = find_header(US"reply-to:", newsize, |
| 2045 | exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW, |
| 2046 | headers_charset); |
| 2047 | if (s) while (isspace(*s)) s++; |
| 2048 | if (!s || !*s) |
| 2049 | { |
| 2050 | *newsize = 0; /* For the *s==0 case */ |
| 2051 | s = find_header(US"from:", newsize, |
| 2052 | exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW, |
| 2053 | headers_charset); |
| 2054 | } |
| 2055 | if (s) |
| 2056 | { |
| 2057 | uschar *t; |
| 2058 | while (isspace(*s)) s++; |
| 2059 | for (t = s; *t != 0; t++) if (*t == '\n') *t = ' '; |
| 2060 | while (t > s && isspace(t[-1])) t--; |
| 2061 | *t = 0; |
| 2062 | } |
| 2063 | return s ? s : US""; |
| 2064 | |
| 2065 | case vtype_string_func: |
| 2066 | { |
| 2067 | stringptr_fn_t * fn = (stringptr_fn_t *) val; |
| 2068 | return fn(); |
| 2069 | } |
| 2070 | |
| 2071 | case vtype_pspace: |
| 2072 | { |
| 2073 | int inodes; |
| 2074 | sprintf(CS var_buffer, PR_EXIM_ARITH, |
| 2075 | receive_statvfs(val == (void *)TRUE, &inodes)); |
| 2076 | } |
| 2077 | return var_buffer; |
| 2078 | |
| 2079 | case vtype_pinodes: |
| 2080 | { |
| 2081 | int inodes; |
| 2082 | (void) receive_statvfs(val == (void *)TRUE, &inodes); |
| 2083 | sprintf(CS var_buffer, "%d", inodes); |
| 2084 | } |
| 2085 | return var_buffer; |
| 2086 | |
| 2087 | case vtype_cert: |
| 2088 | return *(void **)val ? US"<cert>" : US""; |
| 2089 | |
| 2090 | #ifndef DISABLE_DKIM |
| 2091 | case vtype_dkim: |
| 2092 | return dkim_exim_expand_query((int)(long)val); |
| 2093 | #endif |
| 2094 | |
| 2095 | } |
| 2096 | |
| 2097 | return NULL; /* Unknown variable. Silences static checkers. */ |
| 2098 | } |
| 2099 | |
| 2100 | |
| 2101 | |
| 2102 | |
| 2103 | void |
| 2104 | modify_variable(uschar *name, void * value) |
| 2105 | { |
| 2106 | var_entry * vp; |
| 2107 | if ((vp = find_var_ent(name))) vp->value = value; |
| 2108 | return; /* Unknown variable name, fail silently */ |
| 2109 | } |
| 2110 | |
| 2111 | |
| 2112 | |
| 2113 | |
| 2114 | |
| 2115 | |
| 2116 | /************************************************* |
| 2117 | * Read and expand substrings * |
| 2118 | *************************************************/ |
| 2119 | |
| 2120 | /* This function is called to read and expand argument substrings for various |
| 2121 | expansion items. Some have a minimum requirement that is less than the maximum; |
| 2122 | in these cases, the first non-present one is set to NULL. |
| 2123 | |
| 2124 | Arguments: |
| 2125 | sub points to vector of pointers to set |
| 2126 | n maximum number of substrings |
| 2127 | m minimum required |
| 2128 | sptr points to current string pointer |
| 2129 | skipping the skipping flag |
| 2130 | check_end if TRUE, check for final '}' |
| 2131 | name name of item, for error message |
| 2132 | resetok if not NULL, pointer to flag - write FALSE if unsafe to reset |
| 2133 | the store. |
| 2134 | |
| 2135 | Returns: 0 OK; string pointer updated |
| 2136 | 1 curly bracketing error (too few arguments) |
| 2137 | 2 too many arguments (only if check_end is set); message set |
| 2138 | 3 other error (expansion failure) |
| 2139 | */ |
| 2140 | |
| 2141 | static int |
| 2142 | read_subs(uschar **sub, int n, int m, const uschar **sptr, BOOL skipping, |
| 2143 | BOOL check_end, uschar *name, BOOL *resetok) |
| 2144 | { |
| 2145 | const uschar *s = *sptr; |
| 2146 | |
| 2147 | while (isspace(*s)) s++; |
| 2148 | for (int i = 0; i < n; i++) |
| 2149 | { |
| 2150 | if (*s != '{') |
| 2151 | { |
| 2152 | if (i < m) |
| 2153 | { |
| 2154 | expand_string_message = string_sprintf("Not enough arguments for '%s' " |
| 2155 | "(min is %d)", name, m); |
| 2156 | return 1; |
| 2157 | } |
| 2158 | sub[i] = NULL; |
| 2159 | break; |
| 2160 | } |
| 2161 | if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, resetok))) |
| 2162 | return 3; |
| 2163 | if (*s++ != '}') return 1; |
| 2164 | while (isspace(*s)) s++; |
| 2165 | } |
| 2166 | if (check_end && *s++ != '}') |
| 2167 | { |
| 2168 | if (s[-1] == '{') |
| 2169 | { |
| 2170 | expand_string_message = string_sprintf("Too many arguments for '%s' " |
| 2171 | "(max is %d)", name, n); |
| 2172 | return 2; |
| 2173 | } |
| 2174 | expand_string_message = string_sprintf("missing '}' after '%s'", name); |
| 2175 | return 1; |
| 2176 | } |
| 2177 | |
| 2178 | *sptr = s; |
| 2179 | return 0; |
| 2180 | } |
| 2181 | |
| 2182 | |
| 2183 | |
| 2184 | |
| 2185 | /************************************************* |
| 2186 | * Elaborate message for bad variable * |
| 2187 | *************************************************/ |
| 2188 | |
| 2189 | /* For the "unknown variable" message, take a look at the variable's name, and |
| 2190 | give additional information about possible ACL variables. The extra information |
| 2191 | is added on to expand_string_message. |
| 2192 | |
| 2193 | Argument: the name of the variable |
| 2194 | Returns: nothing |
| 2195 | */ |
| 2196 | |
| 2197 | static void |
| 2198 | check_variable_error_message(uschar *name) |
| 2199 | { |
| 2200 | if (Ustrncmp(name, "acl_", 4) == 0) |
| 2201 | expand_string_message = string_sprintf("%s (%s)", expand_string_message, |
| 2202 | (name[4] == 'c' || name[4] == 'm')? |
| 2203 | (isalpha(name[5])? |
| 2204 | US"6th character of a user-defined ACL variable must be a digit or underscore" : |
| 2205 | US"strict_acl_vars is set" /* Syntax is OK, it has to be this */ |
| 2206 | ) : |
| 2207 | US"user-defined ACL variables must start acl_c or acl_m"); |
| 2208 | } |
| 2209 | |
| 2210 | |
| 2211 | |
| 2212 | /* |
| 2213 | Load args from sub array to globals, and call acl_check(). |
| 2214 | Sub array will be corrupted on return. |
| 2215 | |
| 2216 | Returns: OK access is granted by an ACCEPT verb |
| 2217 | DISCARD access is (apparently) granted by a DISCARD verb |
| 2218 | FAIL access is denied |
| 2219 | FAIL_DROP access is denied; drop the connection |
| 2220 | DEFER can't tell at the moment |
| 2221 | ERROR disaster |
| 2222 | */ |
| 2223 | static int |
| 2224 | eval_acl(uschar ** sub, int nsub, uschar ** user_msgp) |
| 2225 | { |
| 2226 | int i; |
| 2227 | int sav_narg = acl_narg; |
| 2228 | int ret; |
| 2229 | uschar * dummy_logmsg; |
| 2230 | extern int acl_where; |
| 2231 | |
| 2232 | if(--nsub > nelem(acl_arg)) nsub = nelem(acl_arg); |
| 2233 | for (i = 0; i < nsub && sub[i+1]; i++) |
| 2234 | { |
| 2235 | uschar * tmp = acl_arg[i]; |
| 2236 | acl_arg[i] = sub[i+1]; /* place callers args in the globals */ |
| 2237 | sub[i+1] = tmp; /* stash the old args using our caller's storage */ |
| 2238 | } |
| 2239 | acl_narg = i; |
| 2240 | while (i < nsub) |
| 2241 | { |
| 2242 | sub[i+1] = acl_arg[i]; |
| 2243 | acl_arg[i++] = NULL; |
| 2244 | } |
| 2245 | |
| 2246 | DEBUG(D_expand) |
| 2247 | debug_printf_indent("expanding: acl: %s arg: %s%s\n", |
| 2248 | sub[0], |
| 2249 | acl_narg>0 ? acl_arg[0] : US"<none>", |
| 2250 | acl_narg>1 ? " +more" : ""); |
| 2251 | |
| 2252 | ret = acl_eval(acl_where, sub[0], user_msgp, &dummy_logmsg); |
| 2253 | |
| 2254 | for (i = 0; i < nsub; i++) |
| 2255 | acl_arg[i] = sub[i+1]; /* restore old args */ |
| 2256 | acl_narg = sav_narg; |
| 2257 | |
| 2258 | return ret; |
| 2259 | } |
| 2260 | |
| 2261 | |
| 2262 | |
| 2263 | |
| 2264 | /* Return pointer to dewrapped string, with enclosing specified chars removed. |
| 2265 | The given string is modified on return. Leading whitespace is skipped while |
| 2266 | looking for the opening wrap character, then the rest is scanned for the trailing |
| 2267 | (non-escaped) wrap character. A backslash in the string will act as an escape. |
| 2268 | |
| 2269 | A nul is written over the trailing wrap, and a pointer to the char after the |
| 2270 | leading wrap is returned. |
| 2271 | |
| 2272 | Arguments: |
| 2273 | s String for de-wrapping |
| 2274 | wrap Two-char string, the first being the opener, second the closer wrapping |
| 2275 | character |
| 2276 | Return: |
| 2277 | Pointer to de-wrapped string, or NULL on error (with expand_string_message set). |
| 2278 | */ |
| 2279 | |
| 2280 | static uschar * |
| 2281 | dewrap(uschar * s, const uschar * wrap) |
| 2282 | { |
| 2283 | uschar * p = s; |
| 2284 | unsigned depth = 0; |
| 2285 | BOOL quotesmode = wrap[0] == wrap[1]; |
| 2286 | |
| 2287 | while (isspace(*p)) p++; |
| 2288 | |
| 2289 | if (*p == *wrap) |
| 2290 | { |
| 2291 | s = ++p; |
| 2292 | wrap++; |
| 2293 | while (*p) |
| 2294 | { |
| 2295 | if (*p == '\\') p++; |
| 2296 | else if (!quotesmode && *p == wrap[-1]) depth++; |
| 2297 | else if (*p == *wrap) |
| 2298 | if (depth == 0) |
| 2299 | { |
| 2300 | *p = '\0'; |
| 2301 | return s; |
| 2302 | } |
| 2303 | else |
| 2304 | depth--; |
| 2305 | p++; |
| 2306 | } |
| 2307 | } |
| 2308 | expand_string_message = string_sprintf("missing '%c'", *wrap); |
| 2309 | return NULL; |
| 2310 | } |
| 2311 | |
| 2312 | |
| 2313 | /* Pull off the leading array or object element, returning |
| 2314 | a copy in an allocated string. Update the list pointer. |
| 2315 | |
| 2316 | The element may itself be an abject or array. |
| 2317 | Return NULL when the list is empty. |
| 2318 | */ |
| 2319 | |
| 2320 | static uschar * |
| 2321 | json_nextinlist(const uschar ** list) |
| 2322 | { |
| 2323 | unsigned array_depth = 0, object_depth = 0; |
| 2324 | const uschar * s = *list, * item; |
| 2325 | |
| 2326 | while (isspace(*s)) s++; |
| 2327 | |
| 2328 | for (item = s; |
| 2329 | *s && (*s != ',' || array_depth != 0 || object_depth != 0); |
| 2330 | s++) |
| 2331 | switch (*s) |
| 2332 | { |
| 2333 | case '[': array_depth++; break; |
| 2334 | case ']': array_depth--; break; |
| 2335 | case '{': object_depth++; break; |
| 2336 | case '}': object_depth--; break; |
| 2337 | } |
| 2338 | *list = *s ? s+1 : s; |
| 2339 | if (item == s) return NULL; |
| 2340 | item = string_copyn(item, s - item); |
| 2341 | DEBUG(D_expand) debug_printf_indent(" json ele: '%s'\n", item); |
| 2342 | return US item; |
| 2343 | } |
| 2344 | |
| 2345 | |
| 2346 | |
| 2347 | /************************************************/ |
| 2348 | /* Return offset in ops table, or -1 if not found. |
| 2349 | Repoint to just after the operator in the string. |
| 2350 | |
| 2351 | Argument: |
| 2352 | ss string representation of operator |
| 2353 | opname split-out operator name |
| 2354 | */ |
| 2355 | |
| 2356 | static int |
| 2357 | identify_operator(const uschar ** ss, uschar ** opname) |
| 2358 | { |
| 2359 | const uschar * s = *ss; |
| 2360 | uschar name[256]; |
| 2361 | |
| 2362 | /* Numeric comparisons are symbolic */ |
| 2363 | |
| 2364 | if (*s == '=' || *s == '>' || *s == '<') |
| 2365 | { |
| 2366 | int p = 0; |
| 2367 | name[p++] = *s++; |
| 2368 | if (*s == '=') |
| 2369 | { |
| 2370 | name[p++] = '='; |
| 2371 | s++; |
| 2372 | } |
| 2373 | name[p] = 0; |
| 2374 | } |
| 2375 | |
| 2376 | /* All other conditions are named */ |
| 2377 | |
| 2378 | else |
| 2379 | s = read_name(name, sizeof(name), s, US"_"); |
| 2380 | *ss = s; |
| 2381 | |
| 2382 | /* If we haven't read a name, it means some non-alpha character is first. */ |
| 2383 | |
| 2384 | if (!name[0]) |
| 2385 | { |
| 2386 | expand_string_message = string_sprintf("condition name expected, " |
| 2387 | "but found \"%.16s\"", s); |
| 2388 | return -1; |
| 2389 | } |
| 2390 | if (opname) |
| 2391 | *opname = string_copy(name); |
| 2392 | |
| 2393 | return chop_match(name, cond_table, nelem(cond_table)); |
| 2394 | } |
| 2395 | |
| 2396 | |
| 2397 | /************************************************* |
| 2398 | * Handle MD5 or SHA-1 computation for HMAC * |
| 2399 | *************************************************/ |
| 2400 | |
| 2401 | /* These are some wrapping functions that enable the HMAC code to be a bit |
| 2402 | cleaner. A good compiler will spot the tail recursion. |
| 2403 | |
| 2404 | Arguments: |
| 2405 | type HMAC_MD5 or HMAC_SHA1 |
| 2406 | remaining are as for the cryptographic hash functions |
| 2407 | |
| 2408 | Returns: nothing |
| 2409 | */ |
| 2410 | |
| 2411 | static void |
| 2412 | chash_start(int type, void * base) |
| 2413 | { |
| 2414 | if (type == HMAC_MD5) |
| 2415 | md5_start((md5 *)base); |
| 2416 | else |
| 2417 | sha1_start((hctx *)base); |
| 2418 | } |
| 2419 | |
| 2420 | static void |
| 2421 | chash_mid(int type, void * base, const uschar * string) |
| 2422 | { |
| 2423 | if (type == HMAC_MD5) |
| 2424 | md5_mid((md5 *)base, string); |
| 2425 | else |
| 2426 | sha1_mid((hctx *)base, string); |
| 2427 | } |
| 2428 | |
| 2429 | static void |
| 2430 | chash_end(int type, void * base, const uschar * string, int length, |
| 2431 | uschar * digest) |
| 2432 | { |
| 2433 | if (type == HMAC_MD5) |
| 2434 | md5_end((md5 *)base, string, length, digest); |
| 2435 | else |
| 2436 | sha1_end((hctx *)base, string, length, digest); |
| 2437 | } |
| 2438 | |
| 2439 | |
| 2440 | |
| 2441 | |
| 2442 | /* Do an hmac_md5. The result is _not_ nul-terminated, and is sized as |
| 2443 | the smaller of a full hmac_md5 result (16 bytes) or the supplied output buffer. |
| 2444 | |
| 2445 | Arguments: |
| 2446 | key encoding key, nul-terminated |
| 2447 | src data to be hashed, nul-terminated |
| 2448 | buf output buffer |
| 2449 | len size of output buffer |
| 2450 | */ |
| 2451 | |
| 2452 | static void |
| 2453 | hmac_md5(const uschar * key, const uschar * src, uschar * buf, unsigned len) |
| 2454 | { |
| 2455 | md5 md5_base; |
| 2456 | const uschar * keyptr; |
| 2457 | uschar * p; |
| 2458 | unsigned int keylen; |
| 2459 | |
| 2460 | #define MD5_HASHLEN 16 |
| 2461 | #define MD5_HASHBLOCKLEN 64 |
| 2462 | |
| 2463 | uschar keyhash[MD5_HASHLEN]; |
| 2464 | uschar innerhash[MD5_HASHLEN]; |
| 2465 | uschar finalhash[MD5_HASHLEN]; |
| 2466 | uschar innerkey[MD5_HASHBLOCKLEN]; |
| 2467 | uschar outerkey[MD5_HASHBLOCKLEN]; |
| 2468 | |
| 2469 | keyptr = key; |
| 2470 | keylen = Ustrlen(keyptr); |
| 2471 | |
| 2472 | /* If the key is longer than the hash block length, then hash the key |
| 2473 | first */ |
| 2474 | |
| 2475 | if (keylen > MD5_HASHBLOCKLEN) |
| 2476 | { |
| 2477 | chash_start(HMAC_MD5, &md5_base); |
| 2478 | chash_end(HMAC_MD5, &md5_base, keyptr, keylen, keyhash); |
| 2479 | keyptr = keyhash; |
| 2480 | keylen = MD5_HASHLEN; |
| 2481 | } |
| 2482 | |
| 2483 | /* Now make the inner and outer key values */ |
| 2484 | |
| 2485 | memset(innerkey, 0x36, MD5_HASHBLOCKLEN); |
| 2486 | memset(outerkey, 0x5c, MD5_HASHBLOCKLEN); |
| 2487 | |
| 2488 | for (int i = 0; i < keylen; i++) |
| 2489 | { |
| 2490 | innerkey[i] ^= keyptr[i]; |
| 2491 | outerkey[i] ^= keyptr[i]; |
| 2492 | } |
| 2493 | |
| 2494 | /* Now do the hashes */ |
| 2495 | |
| 2496 | chash_start(HMAC_MD5, &md5_base); |
| 2497 | chash_mid(HMAC_MD5, &md5_base, innerkey); |
| 2498 | chash_end(HMAC_MD5, &md5_base, src, Ustrlen(src), innerhash); |
| 2499 | |
| 2500 | chash_start(HMAC_MD5, &md5_base); |
| 2501 | chash_mid(HMAC_MD5, &md5_base, outerkey); |
| 2502 | chash_end(HMAC_MD5, &md5_base, innerhash, MD5_HASHLEN, finalhash); |
| 2503 | |
| 2504 | /* Encode the final hash as a hex string, limited by output buffer size */ |
| 2505 | |
| 2506 | p = buf; |
| 2507 | for (int i = 0, j = len; i < MD5_HASHLEN; i++) |
| 2508 | { |
| 2509 | if (j-- <= 0) break; |
| 2510 | *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4]; |
| 2511 | if (j-- <= 0) break; |
| 2512 | *p++ = hex_digits[finalhash[i] & 0x0f]; |
| 2513 | } |
| 2514 | return; |
| 2515 | } |
| 2516 | |
| 2517 | |
| 2518 | /************************************************* |
| 2519 | * Read and evaluate a condition * |
| 2520 | *************************************************/ |
| 2521 | |
| 2522 | /* |
| 2523 | Arguments: |
| 2524 | s points to the start of the condition text |
| 2525 | resetok points to a BOOL which is written false if it is unsafe to |
| 2526 | free memory. Certain condition types (acl) may have side-effect |
| 2527 | allocation which must be preserved. |
| 2528 | yield points to a BOOL to hold the result of the condition test; |
| 2529 | if NULL, we are just reading through a condition that is |
| 2530 | part of an "or" combination to check syntax, or in a state |
| 2531 | where the answer isn't required |
| 2532 | |
| 2533 | Returns: a pointer to the first character after the condition, or |
| 2534 | NULL after an error |
| 2535 | */ |
| 2536 | |
| 2537 | static const uschar * |
| 2538 | eval_condition(const uschar *s, BOOL *resetok, BOOL *yield) |
| 2539 | { |
| 2540 | BOOL testfor = TRUE; |
| 2541 | BOOL tempcond, combined_cond; |
| 2542 | BOOL *subcondptr; |
| 2543 | BOOL sub2_honour_dollar = TRUE; |
| 2544 | BOOL is_forany, is_json, is_jsons; |
| 2545 | int rc, cond_type, roffset; |
| 2546 | int_eximarith_t num[2]; |
| 2547 | struct stat statbuf; |
| 2548 | uschar * opname; |
| 2549 | uschar name[256]; |
| 2550 | const uschar *sub[10]; |
| 2551 | |
| 2552 | const pcre *re; |
| 2553 | const uschar *rerror; |
| 2554 | |
| 2555 | for (;;) |
| 2556 | { |
| 2557 | while (isspace(*s)) s++; |
| 2558 | if (*s == '!') { testfor = !testfor; s++; } else break; |
| 2559 | } |
| 2560 | |
| 2561 | switch(cond_type = identify_operator(&s, &opname)) |
| 2562 | { |
| 2563 | /* def: tests for a non-empty variable, or for the existence of a header. If |
| 2564 | yield == NULL we are in a skipping state, and don't care about the answer. */ |
| 2565 | |
| 2566 | case ECOND_DEF: |
| 2567 | { |
| 2568 | uschar * t; |
| 2569 | |
| 2570 | if (*s != ':') |
| 2571 | { |
| 2572 | expand_string_message = US"\":\" expected after \"def\""; |
| 2573 | return NULL; |
| 2574 | } |
| 2575 | |
| 2576 | s = read_name(name, sizeof(name), s+1, US"_"); |
| 2577 | |
| 2578 | /* Test for a header's existence. If the name contains a closing brace |
| 2579 | character, this may be a user error where the terminating colon has been |
| 2580 | omitted. Set a flag to adjust a subsequent error message in this case. */ |
| 2581 | |
| 2582 | if ( ( *(t = name) == 'h' |
| 2583 | || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h' |
| 2584 | ) |
| 2585 | && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0) |
| 2586 | ) |
| 2587 | { |
| 2588 | s = read_header_name(name, sizeof(name), s); |
| 2589 | /* {-for-text-editors */ |
| 2590 | if (Ustrchr(name, '}') != NULL) malformed_header = TRUE; |
| 2591 | if (yield) *yield = |
| 2592 | (find_header(name, NULL, FH_EXISTS_ONLY, NULL) != NULL) == testfor; |
| 2593 | } |
| 2594 | |
| 2595 | /* Test for a variable's having a non-empty value. A non-existent variable |
| 2596 | causes an expansion failure. */ |
| 2597 | |
| 2598 | else |
| 2599 | { |
| 2600 | if (!(t = find_variable(name, TRUE, yield == NULL, NULL))) |
| 2601 | { |
| 2602 | expand_string_message = name[0] |
| 2603 | ? string_sprintf("unknown variable \"%s\" after \"def:\"", name) |
| 2604 | : US"variable name omitted after \"def:\""; |
| 2605 | check_variable_error_message(name); |
| 2606 | return NULL; |
| 2607 | } |
| 2608 | if (yield) *yield = (t[0] != 0) == testfor; |
| 2609 | } |
| 2610 | |
| 2611 | return s; |
| 2612 | } |
| 2613 | |
| 2614 | |
| 2615 | /* first_delivery tests for first delivery attempt */ |
| 2616 | |
| 2617 | case ECOND_FIRST_DELIVERY: |
| 2618 | if (yield) *yield = f.deliver_firsttime == testfor; |
| 2619 | return s; |
| 2620 | |
| 2621 | |
| 2622 | /* queue_running tests for any process started by a queue runner */ |
| 2623 | |
| 2624 | case ECOND_QUEUE_RUNNING: |
| 2625 | if (yield) *yield = (queue_run_pid != (pid_t)0) == testfor; |
| 2626 | return s; |
| 2627 | |
| 2628 | |
| 2629 | /* exists: tests for file existence |
| 2630 | isip: tests for any IP address |
| 2631 | isip4: tests for an IPv4 address |
| 2632 | isip6: tests for an IPv6 address |
| 2633 | pam: does PAM authentication |
| 2634 | radius: does RADIUS authentication |
| 2635 | ldapauth: does LDAP authentication |
| 2636 | pwcheck: does Cyrus SASL pwcheck authentication |
| 2637 | */ |
| 2638 | |
| 2639 | case ECOND_EXISTS: |
| 2640 | case ECOND_ISIP: |
| 2641 | case ECOND_ISIP4: |
| 2642 | case ECOND_ISIP6: |
| 2643 | case ECOND_PAM: |
| 2644 | case ECOND_RADIUS: |
| 2645 | case ECOND_LDAPAUTH: |
| 2646 | case ECOND_PWCHECK: |
| 2647 | |
| 2648 | while (isspace(*s)) s++; |
| 2649 | if (*s != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */ |
| 2650 | |
| 2651 | sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL, TRUE, resetok); |
| 2652 | if (!sub[0]) return NULL; |
| 2653 | /* {-for-text-editors */ |
| 2654 | if (*s++ != '}') goto COND_FAILED_CURLY_END; |
| 2655 | |
| 2656 | if (!yield) return s; /* No need to run the test if skipping */ |
| 2657 | |
| 2658 | switch(cond_type) |
| 2659 | { |
| 2660 | case ECOND_EXISTS: |
| 2661 | if ((expand_forbid & RDO_EXISTS) != 0) |
| 2662 | { |
| 2663 | expand_string_message = US"File existence tests are not permitted"; |
| 2664 | return NULL; |
| 2665 | } |
| 2666 | *yield = (Ustat(sub[0], &statbuf) == 0) == testfor; |
| 2667 | break; |
| 2668 | |
| 2669 | case ECOND_ISIP: |
| 2670 | case ECOND_ISIP4: |
| 2671 | case ECOND_ISIP6: |
| 2672 | rc = string_is_ip_address(sub[0], NULL); |
| 2673 | *yield = ((cond_type == ECOND_ISIP)? (rc != 0) : |
| 2674 | (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor; |
| 2675 | break; |
| 2676 | |
| 2677 | /* Various authentication tests - all optionally compiled */ |
| 2678 | |
| 2679 | case ECOND_PAM: |
| 2680 | #ifdef SUPPORT_PAM |
| 2681 | rc = auth_call_pam(sub[0], &expand_string_message); |
| 2682 | goto END_AUTH; |
| 2683 | #else |
| 2684 | goto COND_FAILED_NOT_COMPILED; |
| 2685 | #endif /* SUPPORT_PAM */ |
| 2686 | |
| 2687 | case ECOND_RADIUS: |
| 2688 | #ifdef RADIUS_CONFIG_FILE |
| 2689 | rc = auth_call_radius(sub[0], &expand_string_message); |
| 2690 | goto END_AUTH; |
| 2691 | #else |
| 2692 | goto COND_FAILED_NOT_COMPILED; |
| 2693 | #endif /* RADIUS_CONFIG_FILE */ |
| 2694 | |
| 2695 | case ECOND_LDAPAUTH: |
| 2696 | #ifdef LOOKUP_LDAP |
| 2697 | { |
| 2698 | /* Just to keep the interface the same */ |
| 2699 | BOOL do_cache; |
| 2700 | int old_pool = store_pool; |
| 2701 | store_pool = POOL_SEARCH; |
| 2702 | rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL, |
| 2703 | &expand_string_message, &do_cache); |
| 2704 | store_pool = old_pool; |
| 2705 | } |
| 2706 | goto END_AUTH; |
| 2707 | #else |
| 2708 | goto COND_FAILED_NOT_COMPILED; |
| 2709 | #endif /* LOOKUP_LDAP */ |
| 2710 | |
| 2711 | case ECOND_PWCHECK: |
| 2712 | #ifdef CYRUS_PWCHECK_SOCKET |
| 2713 | rc = auth_call_pwcheck(sub[0], &expand_string_message); |
| 2714 | goto END_AUTH; |
| 2715 | #else |
| 2716 | goto COND_FAILED_NOT_COMPILED; |
| 2717 | #endif /* CYRUS_PWCHECK_SOCKET */ |
| 2718 | |
| 2719 | #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \ |
| 2720 | defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET) |
| 2721 | END_AUTH: |
| 2722 | if (rc == ERROR || rc == DEFER) return NULL; |
| 2723 | *yield = (rc == OK) == testfor; |
| 2724 | #endif |
| 2725 | } |
| 2726 | return s; |
| 2727 | |
| 2728 | |
| 2729 | /* call ACL (in a conditional context). Accept true, deny false. |
| 2730 | Defer is a forced-fail. Anything set by message= goes to $value. |
| 2731 | Up to ten parameters are used; we use the braces round the name+args |
| 2732 | like the saslauthd condition does, to permit a variable number of args. |
| 2733 | See also the expansion-item version EITEM_ACL and the traditional |
| 2734 | acl modifier ACLC_ACL. |
| 2735 | Since the ACL may allocate new global variables, tell our caller to not |
| 2736 | reclaim memory. |
| 2737 | */ |
| 2738 | |
| 2739 | case ECOND_ACL: |
| 2740 | /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */ |
| 2741 | { |
| 2742 | uschar *sub[10]; |
| 2743 | uschar *user_msg; |
| 2744 | BOOL cond = FALSE; |
| 2745 | |
| 2746 | while (isspace(*s)) s++; |
| 2747 | if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/ |
| 2748 | |
| 2749 | switch(read_subs(sub, nelem(sub), 1, |
| 2750 | &s, yield == NULL, TRUE, US"acl", resetok)) |
| 2751 | { |
| 2752 | case 1: expand_string_message = US"too few arguments or bracketing " |
| 2753 | "error for acl"; |
| 2754 | case 2: |
| 2755 | case 3: return NULL; |
| 2756 | } |
| 2757 | |
| 2758 | if (yield) |
| 2759 | { |
| 2760 | int rc; |
| 2761 | *resetok = FALSE; /* eval_acl() might allocate; do not reclaim */ |
| 2762 | switch(rc = eval_acl(sub, nelem(sub), &user_msg)) |
| 2763 | { |
| 2764 | case OK: |
| 2765 | cond = TRUE; |
| 2766 | case FAIL: |
| 2767 | lookup_value = NULL; |
| 2768 | if (user_msg) |
| 2769 | lookup_value = string_copy(user_msg); |
| 2770 | *yield = cond == testfor; |
| 2771 | break; |
| 2772 | |
| 2773 | case DEFER: |
| 2774 | f.expand_string_forcedfail = TRUE; |
| 2775 | /*FALLTHROUGH*/ |
| 2776 | default: |
| 2777 | expand_string_message = string_sprintf("%s from acl \"%s\"", |
| 2778 | rc_names[rc], sub[0]); |
| 2779 | return NULL; |
| 2780 | } |
| 2781 | } |
| 2782 | return s; |
| 2783 | } |
| 2784 | |
| 2785 | |
| 2786 | /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used: |
| 2787 | |
| 2788 | ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}} |
| 2789 | |
| 2790 | However, the last two are optional. That is why the whole set is enclosed |
| 2791 | in their own set of braces. */ |
| 2792 | |
| 2793 | case ECOND_SASLAUTHD: |
| 2794 | #ifndef CYRUS_SASLAUTHD_SOCKET |
| 2795 | goto COND_FAILED_NOT_COMPILED; |
| 2796 | #else |
| 2797 | { |
| 2798 | uschar *sub[4]; |
| 2799 | while (isspace(*s)) s++; |
| 2800 | if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */ |
| 2801 | switch(read_subs(sub, nelem(sub), 2, &s, yield == NULL, TRUE, US"saslauthd", |
| 2802 | resetok)) |
| 2803 | { |
| 2804 | case 1: expand_string_message = US"too few arguments or bracketing " |
| 2805 | "error for saslauthd"; |
| 2806 | case 2: |
| 2807 | case 3: return NULL; |
| 2808 | } |
| 2809 | if (!sub[2]) sub[3] = NULL; /* realm if no service */ |
| 2810 | if (yield) |
| 2811 | { |
| 2812 | int rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3], |
| 2813 | &expand_string_message); |
| 2814 | if (rc == ERROR || rc == DEFER) return NULL; |
| 2815 | *yield = (rc == OK) == testfor; |
| 2816 | } |
| 2817 | return s; |
| 2818 | } |
| 2819 | #endif /* CYRUS_SASLAUTHD_SOCKET */ |
| 2820 | |
| 2821 | |
| 2822 | /* symbolic operators for numeric and string comparison, and a number of |
| 2823 | other operators, all requiring two arguments. |
| 2824 | |
| 2825 | crypteq: encrypts plaintext and compares against an encrypted text, |
| 2826 | using crypt(), crypt16(), MD5 or SHA-1 |
| 2827 | inlist/inlisti: checks if first argument is in the list of the second |
| 2828 | match: does a regular expression match and sets up the numerical |
| 2829 | variables if it succeeds |
| 2830 | match_address: matches in an address list |
| 2831 | match_domain: matches in a domain list |
| 2832 | match_ip: matches a host list that is restricted to IP addresses |
| 2833 | match_local_part: matches in a local part list |
| 2834 | */ |
| 2835 | |
| 2836 | case ECOND_MATCH_ADDRESS: |
| 2837 | case ECOND_MATCH_DOMAIN: |
| 2838 | case ECOND_MATCH_IP: |
| 2839 | case ECOND_MATCH_LOCAL_PART: |
| 2840 | #ifndef EXPAND_LISTMATCH_RHS |
| 2841 | sub2_honour_dollar = FALSE; |
| 2842 | #endif |
| 2843 | /* FALLTHROUGH */ |
| 2844 | |
| 2845 | case ECOND_CRYPTEQ: |
| 2846 | case ECOND_INLIST: |
| 2847 | case ECOND_INLISTI: |
| 2848 | case ECOND_MATCH: |
| 2849 | |
| 2850 | case ECOND_NUM_L: /* Numerical comparisons */ |
| 2851 | case ECOND_NUM_LE: |
| 2852 | case ECOND_NUM_E: |
| 2853 | case ECOND_NUM_EE: |
| 2854 | case ECOND_NUM_G: |
| 2855 | case ECOND_NUM_GE: |
| 2856 | |
| 2857 | case ECOND_STR_LT: /* String comparisons */ |
| 2858 | case ECOND_STR_LTI: |
| 2859 | case ECOND_STR_LE: |
| 2860 | case ECOND_STR_LEI: |
| 2861 | case ECOND_STR_EQ: |
| 2862 | case ECOND_STR_EQI: |
| 2863 | case ECOND_STR_GT: |
| 2864 | case ECOND_STR_GTI: |
| 2865 | case ECOND_STR_GE: |
| 2866 | case ECOND_STR_GEI: |
| 2867 | |
| 2868 | for (int i = 0; i < 2; i++) |
| 2869 | { |
| 2870 | /* Sometimes, we don't expand substrings; too many insecure configurations |
| 2871 | created using match_address{}{} and friends, where the second param |
| 2872 | includes information from untrustworthy sources. */ |
| 2873 | BOOL honour_dollar = TRUE; |
| 2874 | if ((i > 0) && !sub2_honour_dollar) |
| 2875 | honour_dollar = FALSE; |
| 2876 | |
| 2877 | while (isspace(*s)) s++; |
| 2878 | if (*s != '{') |
| 2879 | { |
| 2880 | if (i == 0) goto COND_FAILED_CURLY_START; |
| 2881 | expand_string_message = string_sprintf("missing 2nd string in {} " |
| 2882 | "after \"%s\"", opname); |
| 2883 | return NULL; |
| 2884 | } |
| 2885 | if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL, |
| 2886 | honour_dollar, resetok))) |
| 2887 | return NULL; |
| 2888 | DEBUG(D_expand) if (i == 1 && !sub2_honour_dollar && Ustrchr(sub[1], '$')) |
| 2889 | debug_printf_indent("WARNING: the second arg is NOT expanded," |
| 2890 | " for security reasons\n"); |
| 2891 | if (*s++ != '}') goto COND_FAILED_CURLY_END; |
| 2892 | |
| 2893 | /* Convert to numerical if required; we know that the names of all the |
| 2894 | conditions that compare numbers do not start with a letter. This just saves |
| 2895 | checking for them individually. */ |
| 2896 | |
| 2897 | if (!isalpha(opname[0]) && yield) |
| 2898 | if (sub[i][0] == 0) |
| 2899 | { |
| 2900 | num[i] = 0; |
| 2901 | DEBUG(D_expand) |
| 2902 | debug_printf_indent("empty string cast to zero for numerical comparison\n"); |
| 2903 | } |
| 2904 | else |
| 2905 | { |
| 2906 | num[i] = expanded_string_integer(sub[i], FALSE); |
| 2907 | if (expand_string_message) return NULL; |
| 2908 | } |
| 2909 | } |
| 2910 | |
| 2911 | /* Result not required */ |
| 2912 | |
| 2913 | if (!yield) return s; |
| 2914 | |
| 2915 | /* Do an appropriate comparison */ |
| 2916 | |
| 2917 | switch(cond_type) |
| 2918 | { |
| 2919 | case ECOND_NUM_E: |
| 2920 | case ECOND_NUM_EE: |
| 2921 | tempcond = (num[0] == num[1]); |
| 2922 | break; |
| 2923 | |
| 2924 | case ECOND_NUM_G: |
| 2925 | tempcond = (num[0] > num[1]); |
| 2926 | break; |
| 2927 | |
| 2928 | case ECOND_NUM_GE: |
| 2929 | tempcond = (num[0] >= num[1]); |
| 2930 | break; |
| 2931 | |
| 2932 | case ECOND_NUM_L: |
| 2933 | tempcond = (num[0] < num[1]); |
| 2934 | break; |
| 2935 | |
| 2936 | case ECOND_NUM_LE: |
| 2937 | tempcond = (num[0] <= num[1]); |
| 2938 | break; |
| 2939 | |
| 2940 | case ECOND_STR_LT: |
| 2941 | tempcond = (Ustrcmp(sub[0], sub[1]) < 0); |
| 2942 | break; |
| 2943 | |
| 2944 | case ECOND_STR_LTI: |
| 2945 | tempcond = (strcmpic(sub[0], sub[1]) < 0); |
| 2946 | break; |
| 2947 | |
| 2948 | case ECOND_STR_LE: |
| 2949 | tempcond = (Ustrcmp(sub[0], sub[1]) <= 0); |
| 2950 | break; |
| 2951 | |
| 2952 | case ECOND_STR_LEI: |
| 2953 | tempcond = (strcmpic(sub[0], sub[1]) <= 0); |
| 2954 | break; |
| 2955 | |
| 2956 | case ECOND_STR_EQ: |
| 2957 | tempcond = (Ustrcmp(sub[0], sub[1]) == 0); |
| 2958 | break; |
| 2959 | |
| 2960 | case ECOND_STR_EQI: |
| 2961 | tempcond = (strcmpic(sub[0], sub[1]) == 0); |
| 2962 | break; |
| 2963 | |
| 2964 | case ECOND_STR_GT: |
| 2965 | tempcond = (Ustrcmp(sub[0], sub[1]) > 0); |
| 2966 | break; |
| 2967 | |
| 2968 | case ECOND_STR_GTI: |
| 2969 | tempcond = (strcmpic(sub[0], sub[1]) > 0); |
| 2970 | break; |
| 2971 | |
| 2972 | case ECOND_STR_GE: |
| 2973 | tempcond = (Ustrcmp(sub[0], sub[1]) >= 0); |
| 2974 | break; |
| 2975 | |
| 2976 | case ECOND_STR_GEI: |
| 2977 | tempcond = (strcmpic(sub[0], sub[1]) >= 0); |
| 2978 | break; |
| 2979 | |
| 2980 | case ECOND_MATCH: /* Regular expression match */ |
| 2981 | if (!(re = pcre_compile(CS sub[1], PCRE_COPT, CCSS &rerror, |
| 2982 | &roffset, NULL))) |
| 2983 | { |
| 2984 | expand_string_message = string_sprintf("regular expression error in " |
| 2985 | "\"%s\": %s at offset %d", sub[1], rerror, roffset); |
| 2986 | return NULL; |
| 2987 | } |
| 2988 | tempcond = regex_match_and_setup(re, sub[0], 0, -1); |
| 2989 | break; |
| 2990 | |
| 2991 | case ECOND_MATCH_ADDRESS: /* Match in an address list */ |
| 2992 | rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0, NULL); |
| 2993 | goto MATCHED_SOMETHING; |
| 2994 | |
| 2995 | case ECOND_MATCH_DOMAIN: /* Match in a domain list */ |
| 2996 | rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL, |
| 2997 | MCL_DOMAIN + MCL_NOEXPAND, TRUE, NULL); |
| 2998 | goto MATCHED_SOMETHING; |
| 2999 | |
| 3000 | case ECOND_MATCH_IP: /* Match IP address in a host list */ |
| 3001 | if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0) |
| 3002 | { |
| 3003 | expand_string_message = string_sprintf("\"%s\" is not an IP address", |
| 3004 | sub[0]); |
| 3005 | return NULL; |
| 3006 | } |
| 3007 | else |
| 3008 | { |
| 3009 | unsigned int *nullcache = NULL; |
| 3010 | check_host_block cb; |
| 3011 | |
| 3012 | cb.host_name = US""; |
| 3013 | cb.host_address = sub[0]; |
| 3014 | |
| 3015 | /* If the host address starts off ::ffff: it is an IPv6 address in |
| 3016 | IPv4-compatible mode. Find the IPv4 part for checking against IPv4 |
| 3017 | addresses. */ |
| 3018 | |
| 3019 | cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)? |
| 3020 | cb.host_address + 7 : cb.host_address; |
| 3021 | |
| 3022 | rc = match_check_list( |
| 3023 | &sub[1], /* the list */ |
| 3024 | 0, /* separator character */ |
| 3025 | &hostlist_anchor, /* anchor pointer */ |
| 3026 | &nullcache, /* cache pointer */ |
| 3027 | check_host, /* function for testing */ |
| 3028 | &cb, /* argument for function */ |
| 3029 | MCL_HOST, /* type of check */ |
| 3030 | sub[0], /* text for debugging */ |
| 3031 | NULL); /* where to pass back data */ |
| 3032 | } |
| 3033 | goto MATCHED_SOMETHING; |
| 3034 | |
| 3035 | case ECOND_MATCH_LOCAL_PART: |
| 3036 | rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL, |
| 3037 | MCL_LOCALPART + MCL_NOEXPAND, TRUE, NULL); |
| 3038 | /* Fall through */ |
| 3039 | /* VVVVVVVVVVVV */ |
| 3040 | MATCHED_SOMETHING: |
| 3041 | switch(rc) |
| 3042 | { |
| 3043 | case OK: |
| 3044 | tempcond = TRUE; |
| 3045 | break; |
| 3046 | |
| 3047 | case FAIL: |
| 3048 | tempcond = FALSE; |
| 3049 | break; |
| 3050 | |
| 3051 | case DEFER: |
| 3052 | expand_string_message = string_sprintf("unable to complete match " |
| 3053 | "against \"%s\": %s", sub[1], search_error_message); |
| 3054 | return NULL; |
| 3055 | } |
| 3056 | |
| 3057 | break; |
| 3058 | |
| 3059 | /* Various "encrypted" comparisons. If the second string starts with |
| 3060 | "{" then an encryption type is given. Default to crypt() or crypt16() |
| 3061 | (build-time choice). */ |
| 3062 | /* }-for-text-editors */ |
| 3063 | |
| 3064 | case ECOND_CRYPTEQ: |
| 3065 | #ifndef SUPPORT_CRYPTEQ |
| 3066 | goto COND_FAILED_NOT_COMPILED; |
| 3067 | #else |
| 3068 | if (strncmpic(sub[1], US"{md5}", 5) == 0) |
| 3069 | { |
| 3070 | int sublen = Ustrlen(sub[1]+5); |
| 3071 | md5 base; |
| 3072 | uschar digest[16]; |
| 3073 | |
| 3074 | md5_start(&base); |
| 3075 | md5_end(&base, sub[0], Ustrlen(sub[0]), digest); |
| 3076 | |
| 3077 | /* If the length that we are comparing against is 24, the MD5 digest |
| 3078 | is expressed as a base64 string. This is the way LDAP does it. However, |
| 3079 | some other software uses a straightforward hex representation. We assume |
| 3080 | this if the length is 32. Other lengths fail. */ |
| 3081 | |
| 3082 | if (sublen == 24) |
| 3083 | { |
| 3084 | uschar *coded = b64encode(CUS digest, 16); |
| 3085 | DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n" |
| 3086 | " subject=%s\n crypted=%s\n", coded, sub[1]+5); |
| 3087 | tempcond = (Ustrcmp(coded, sub[1]+5) == 0); |
| 3088 | } |
| 3089 | else if (sublen == 32) |
| 3090 | { |
| 3091 | uschar coded[36]; |
| 3092 | for (int i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]); |
| 3093 | coded[32] = 0; |
| 3094 | DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n" |
| 3095 | " subject=%s\n crypted=%s\n", coded, sub[1]+5); |
| 3096 | tempcond = (strcmpic(coded, sub[1]+5) == 0); |
| 3097 | } |
| 3098 | else |
| 3099 | { |
| 3100 | DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: " |
| 3101 | "fail\n crypted=%s\n", sub[1]+5); |
| 3102 | tempcond = FALSE; |
| 3103 | } |
| 3104 | } |
| 3105 | |
| 3106 | else if (strncmpic(sub[1], US"{sha1}", 6) == 0) |
| 3107 | { |
| 3108 | int sublen = Ustrlen(sub[1]+6); |
| 3109 | hctx h; |
| 3110 | uschar digest[20]; |
| 3111 | |
| 3112 | sha1_start(&h); |
| 3113 | sha1_end(&h, sub[0], Ustrlen(sub[0]), digest); |
| 3114 | |
| 3115 | /* If the length that we are comparing against is 28, assume the SHA1 |
| 3116 | digest is expressed as a base64 string. If the length is 40, assume a |
| 3117 | straightforward hex representation. Other lengths fail. */ |
| 3118 | |
| 3119 | if (sublen == 28) |
| 3120 | { |
| 3121 | uschar *coded = b64encode(CUS digest, 20); |
| 3122 | DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n" |
| 3123 | " subject=%s\n crypted=%s\n", coded, sub[1]+6); |
| 3124 | tempcond = (Ustrcmp(coded, sub[1]+6) == 0); |
| 3125 | } |
| 3126 | else if (sublen == 40) |
| 3127 | { |
| 3128 | uschar coded[44]; |
| 3129 | for (int i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]); |
| 3130 | coded[40] = 0; |
| 3131 | DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n" |
| 3132 | " subject=%s\n crypted=%s\n", coded, sub[1]+6); |
| 3133 | tempcond = (strcmpic(coded, sub[1]+6) == 0); |
| 3134 | } |
| 3135 | else |
| 3136 | { |
| 3137 | DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: " |
| 3138 | "fail\n crypted=%s\n", sub[1]+6); |
| 3139 | tempcond = FALSE; |
| 3140 | } |
| 3141 | } |
| 3142 | |
| 3143 | else /* {crypt} or {crypt16} and non-{ at start */ |
| 3144 | /* }-for-text-editors */ |
| 3145 | { |
| 3146 | int which = 0; |
| 3147 | uschar *coded; |
| 3148 | |
| 3149 | if (strncmpic(sub[1], US"{crypt}", 7) == 0) |
| 3150 | { |
| 3151 | sub[1] += 7; |
| 3152 | which = 1; |
| 3153 | } |
| 3154 | else if (strncmpic(sub[1], US"{crypt16}", 9) == 0) |
| 3155 | { |
| 3156 | sub[1] += 9; |
| 3157 | which = 2; |
| 3158 | } |
| 3159 | else if (sub[1][0] == '{') /* }-for-text-editors */ |
| 3160 | { |
| 3161 | expand_string_message = string_sprintf("unknown encryption mechanism " |
| 3162 | "in \"%s\"", sub[1]); |
| 3163 | return NULL; |
| 3164 | } |
| 3165 | |
| 3166 | switch(which) |
| 3167 | { |
| 3168 | case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break; |
| 3169 | case 1: coded = US crypt(CS sub[0], CS sub[1]); break; |
| 3170 | default: coded = US crypt16(CS sub[0], CS sub[1]); break; |
| 3171 | } |
| 3172 | |
| 3173 | #define STR(s) # s |
| 3174 | #define XSTR(s) STR(s) |
| 3175 | DEBUG(D_auth) debug_printf("crypteq: using %s()\n" |
| 3176 | " subject=%s\n crypted=%s\n", |
| 3177 | which == 0 ? XSTR(DEFAULT_CRYPT) : which == 1 ? "crypt" : "crypt16", |
| 3178 | coded, sub[1]); |
| 3179 | #undef STR |
| 3180 | #undef XSTR |
| 3181 | |
| 3182 | /* If the encrypted string contains fewer than two characters (for the |
| 3183 | salt), force failure. Otherwise we get false positives: with an empty |
| 3184 | string the yield of crypt() is an empty string! */ |
| 3185 | |
| 3186 | if (coded) |
| 3187 | tempcond = Ustrlen(sub[1]) < 2 ? FALSE : Ustrcmp(coded, sub[1]) == 0; |
| 3188 | else if (errno == EINVAL) |
| 3189 | tempcond = FALSE; |
| 3190 | else |
| 3191 | { |
| 3192 | expand_string_message = string_sprintf("crypt error: %s\n", |
| 3193 | US strerror(errno)); |
| 3194 | return NULL; |
| 3195 | } |
| 3196 | } |
| 3197 | break; |
| 3198 | #endif /* SUPPORT_CRYPTEQ */ |
| 3199 | |
| 3200 | case ECOND_INLIST: |
| 3201 | case ECOND_INLISTI: |
| 3202 | { |
| 3203 | const uschar * list = sub[1]; |
| 3204 | int sep = 0; |
| 3205 | uschar *save_iterate_item = iterate_item; |
| 3206 | int (*compare)(const uschar *, const uschar *); |
| 3207 | |
| 3208 | DEBUG(D_expand) debug_printf_indent("condition: %s item: %s\n", opname, sub[0]); |
| 3209 | |
| 3210 | tempcond = FALSE; |
| 3211 | compare = cond_type == ECOND_INLISTI |
| 3212 | ? strcmpic : (int (*)(const uschar *, const uschar *)) strcmp; |
| 3213 | |
| 3214 | while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0))) |
| 3215 | { |
| 3216 | DEBUG(D_expand) debug_printf_indent(" compare %s\n", iterate_item); |
| 3217 | if (compare(sub[0], iterate_item) == 0) |
| 3218 | { |
| 3219 | tempcond = TRUE; |
| 3220 | break; |
| 3221 | } |
| 3222 | } |
| 3223 | iterate_item = save_iterate_item; |
| 3224 | } |
| 3225 | |
| 3226 | } /* Switch for comparison conditions */ |
| 3227 | |
| 3228 | *yield = tempcond == testfor; |
| 3229 | return s; /* End of comparison conditions */ |
| 3230 | |
| 3231 | |
| 3232 | /* and/or: computes logical and/or of several conditions */ |
| 3233 | |
| 3234 | case ECOND_AND: |
| 3235 | case ECOND_OR: |
| 3236 | subcondptr = (yield == NULL) ? NULL : &tempcond; |
| 3237 | combined_cond = (cond_type == ECOND_AND); |
| 3238 | |
| 3239 | while (isspace(*s)) s++; |
| 3240 | if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */ |
| 3241 | |
| 3242 | for (;;) |
| 3243 | { |
| 3244 | while (isspace(*s)) s++; |
| 3245 | /* {-for-text-editors */ |
| 3246 | if (*s == '}') break; |
| 3247 | if (*s != '{') /* }-for-text-editors */ |
| 3248 | { |
| 3249 | expand_string_message = string_sprintf("each subcondition " |
| 3250 | "inside an \"%s{...}\" condition must be in its own {}", opname); |
| 3251 | return NULL; |
| 3252 | } |
| 3253 | |
| 3254 | if (!(s = eval_condition(s+1, resetok, subcondptr))) |
| 3255 | { |
| 3256 | expand_string_message = string_sprintf("%s inside \"%s{...}\" condition", |
| 3257 | expand_string_message, opname); |
| 3258 | return NULL; |
| 3259 | } |
| 3260 | while (isspace(*s)) s++; |
| 3261 | |
| 3262 | /* {-for-text-editors */ |
| 3263 | if (*s++ != '}') |
| 3264 | { |
| 3265 | /* {-for-text-editors */ |
| 3266 | expand_string_message = string_sprintf("missing } at end of condition " |
| 3267 | "inside \"%s\" group", opname); |
| 3268 | return NULL; |
| 3269 | } |
| 3270 | |
| 3271 | if (yield) |
| 3272 | if (cond_type == ECOND_AND) |
| 3273 | { |
| 3274 | combined_cond &= tempcond; |
| 3275 | if (!combined_cond) subcondptr = NULL; /* once false, don't */ |
| 3276 | } /* evaluate any more */ |
| 3277 | else |
| 3278 | { |
| 3279 | combined_cond |= tempcond; |
| 3280 | if (combined_cond) subcondptr = NULL; /* once true, don't */ |
| 3281 | } /* evaluate any more */ |
| 3282 | } |
| 3283 | |
| 3284 | if (yield) *yield = (combined_cond == testfor); |
| 3285 | return ++s; |
| 3286 | |
| 3287 | |
| 3288 | /* forall/forany: iterates a condition with different values */ |
| 3289 | |
| 3290 | case ECOND_FORALL: is_forany = FALSE; is_json = FALSE; is_jsons = FALSE; goto FORMANY; |
| 3291 | case ECOND_FORANY: is_forany = TRUE; is_json = FALSE; is_jsons = FALSE; goto FORMANY; |
| 3292 | case ECOND_FORALL_JSON: is_forany = FALSE; is_json = TRUE; is_jsons = FALSE; goto FORMANY; |
| 3293 | case ECOND_FORANY_JSON: is_forany = TRUE; is_json = TRUE; is_jsons = FALSE; goto FORMANY; |
| 3294 | case ECOND_FORALL_JSONS: is_forany = FALSE; is_json = TRUE; is_jsons = TRUE; goto FORMANY; |
| 3295 | case ECOND_FORANY_JSONS: is_forany = TRUE; is_json = TRUE; is_jsons = TRUE; goto FORMANY; |
| 3296 | |
| 3297 | FORMANY: |
| 3298 | { |
| 3299 | const uschar * list; |
| 3300 | int sep = 0; |
| 3301 | uschar *save_iterate_item = iterate_item; |
| 3302 | |
| 3303 | DEBUG(D_expand) debug_printf_indent("condition: %s\n", opname); |
| 3304 | |
| 3305 | while (isspace(*s)) s++; |
| 3306 | if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */ |
| 3307 | if (!(sub[0] = expand_string_internal(s, TRUE, &s, yield == NULL, TRUE, resetok))) |
| 3308 | return NULL; |
| 3309 | /* {-for-text-editors */ |
| 3310 | if (*s++ != '}') goto COND_FAILED_CURLY_END; |
| 3311 | |
| 3312 | while (isspace(*s)) s++; |
| 3313 | if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */ |
| 3314 | |
| 3315 | sub[1] = s; |
| 3316 | |
| 3317 | /* Call eval_condition once, with result discarded (as if scanning a |
| 3318 | "false" part). This allows us to find the end of the condition, because if |
| 3319 | the list it empty, we won't actually evaluate the condition for real. */ |
| 3320 | |
| 3321 | if (!(s = eval_condition(sub[1], resetok, NULL))) |
| 3322 | { |
| 3323 | expand_string_message = string_sprintf("%s inside \"%s\" condition", |
| 3324 | expand_string_message, opname); |
| 3325 | return NULL; |
| 3326 | } |
| 3327 | while (isspace(*s)) s++; |
| 3328 | |
| 3329 | /* {-for-text-editors */ |
| 3330 | if (*s++ != '}') |
| 3331 | { |
| 3332 | /* {-for-text-editors */ |
| 3333 | expand_string_message = string_sprintf("missing } at end of condition " |
| 3334 | "inside \"%s\"", opname); |
| 3335 | return NULL; |
| 3336 | } |
| 3337 | |
| 3338 | if (yield) *yield = !testfor; |
| 3339 | list = sub[0]; |
| 3340 | if (is_json) list = dewrap(string_copy(list), US"[]"); |
| 3341 | while ((iterate_item = is_json |
| 3342 | ? json_nextinlist(&list) : string_nextinlist(&list, &sep, NULL, 0))) |
| 3343 | { |
| 3344 | if (is_jsons) |
| 3345 | if (!(iterate_item = dewrap(iterate_item, US"\"\""))) |
| 3346 | { |
| 3347 | expand_string_message = |
| 3348 | string_sprintf("%s wrapping string result for extract jsons", |
| 3349 | expand_string_message); |
| 3350 | iterate_item = save_iterate_item; |
| 3351 | return NULL; |
| 3352 | } |
| 3353 | |
| 3354 | DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", opname, iterate_item); |
| 3355 | if (!eval_condition(sub[1], resetok, &tempcond)) |
| 3356 | { |
| 3357 | expand_string_message = string_sprintf("%s inside \"%s\" condition", |
| 3358 | expand_string_message, opname); |
| 3359 | iterate_item = save_iterate_item; |
| 3360 | return NULL; |
| 3361 | } |
| 3362 | DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", opname, |
| 3363 | tempcond? "true":"false"); |
| 3364 | |
| 3365 | if (yield) *yield = (tempcond == testfor); |
| 3366 | if (tempcond == is_forany) break; |
| 3367 | } |
| 3368 | |
| 3369 | iterate_item = save_iterate_item; |
| 3370 | return s; |
| 3371 | } |
| 3372 | |
| 3373 | |
| 3374 | /* The bool{} expansion condition maps a string to boolean. |
| 3375 | The values supported should match those supported by the ACL condition |
| 3376 | (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas |
| 3377 | of true/false. Note that Router "condition" rules have a different |
| 3378 | interpretation, where general data can be used and only a few values |
| 3379 | map to FALSE. |
| 3380 | Note that readconf.c boolean matching, for boolean configuration options, |
| 3381 | only matches true/yes/false/no. |
| 3382 | The bool_lax{} condition matches the Router logic, which is much more |
| 3383 | liberal. */ |
| 3384 | case ECOND_BOOL: |
| 3385 | case ECOND_BOOL_LAX: |
| 3386 | { |
| 3387 | uschar *sub_arg[1]; |
| 3388 | uschar *t, *t2; |
| 3389 | uschar *ourname; |
| 3390 | size_t len; |
| 3391 | BOOL boolvalue = FALSE; |
| 3392 | while (isspace(*s)) s++; |
| 3393 | if (*s != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */ |
| 3394 | ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool"; |
| 3395 | switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname, resetok)) |
| 3396 | { |
| 3397 | case 1: expand_string_message = string_sprintf( |
| 3398 | "too few arguments or bracketing error for %s", |
| 3399 | ourname); |
| 3400 | /*FALLTHROUGH*/ |
| 3401 | case 2: |
| 3402 | case 3: return NULL; |
| 3403 | } |
| 3404 | t = sub_arg[0]; |
| 3405 | while (isspace(*t)) t++; |
| 3406 | len = Ustrlen(t); |
| 3407 | if (len) |
| 3408 | { |
| 3409 | /* trailing whitespace: seems like a good idea to ignore it too */ |
| 3410 | t2 = t + len - 1; |
| 3411 | while (isspace(*t2)) t2--; |
| 3412 | if (t2 != (t + len)) |
| 3413 | { |
| 3414 | *++t2 = '\0'; |
| 3415 | len = t2 - t; |
| 3416 | } |
| 3417 | } |
| 3418 | DEBUG(D_expand) |
| 3419 | debug_printf_indent("considering %s: %s\n", ourname, len ? t : US"<empty>"); |
| 3420 | /* logic for the lax case from expand_check_condition(), which also does |
| 3421 | expands, and the logic is both short and stable enough that there should |
| 3422 | be no maintenance burden from replicating it. */ |
| 3423 | if (len == 0) |
| 3424 | boolvalue = FALSE; |
| 3425 | else if (*t == '-' |
| 3426 | ? Ustrspn(t+1, "0123456789") == len-1 |
| 3427 | : Ustrspn(t, "0123456789") == len) |
| 3428 | { |
| 3429 | boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE; |
| 3430 | /* expand_check_condition only does a literal string "0" check */ |
| 3431 | if ((cond_type == ECOND_BOOL_LAX) && (len > 1)) |
| 3432 | boolvalue = TRUE; |
| 3433 | } |
| 3434 | else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0) |
| 3435 | boolvalue = TRUE; |
| 3436 | else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0) |
| 3437 | boolvalue = FALSE; |
| 3438 | else if (cond_type == ECOND_BOOL_LAX) |
| 3439 | boolvalue = TRUE; |
| 3440 | else |
| 3441 | { |
| 3442 | expand_string_message = string_sprintf("unrecognised boolean " |
| 3443 | "value \"%s\"", t); |
| 3444 | return NULL; |
| 3445 | } |
| 3446 | DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", ourname, |
| 3447 | boolvalue? "true":"false"); |
| 3448 | if (yield) *yield = (boolvalue == testfor); |
| 3449 | return s; |
| 3450 | } |
| 3451 | |
| 3452 | #ifdef EXPERIMENTAL_SRS_NATIVE |
| 3453 | case ECOND_INBOUND_SRS: |
| 3454 | /* ${if inbound_srs {local_part}{secret} {yes}{no}} */ |
| 3455 | { |
| 3456 | uschar * sub[2]; |
| 3457 | const pcre * re; |
| 3458 | int ovec[3*(4+1)]; |
| 3459 | int n; |
| 3460 | uschar cksum[4]; |
| 3461 | BOOL boolvalue = FALSE; |
| 3462 | |
| 3463 | switch(read_subs(sub, 2, 2, CUSS &s, yield == NULL, FALSE, US"inbound_srs", resetok)) |
| 3464 | { |
| 3465 | case 1: expand_string_message = US"too few arguments or bracketing " |
| 3466 | "error for inbound_srs"; |
| 3467 | case 2: |
| 3468 | case 3: return NULL; |
| 3469 | } |
| 3470 | |
| 3471 | /* Match the given local_part against the SRS-encoded pattern */ |
| 3472 | |
| 3473 | re = regex_must_compile(US"^(?i)SRS0=([^=]+)=([A-Z2-7]+)=([^=]*)=(.*)$", |
| 3474 | TRUE, FALSE); |
| 3475 | if (pcre_exec(re, NULL, CS sub[0], Ustrlen(sub[0]), 0, PCRE_EOPT, |
| 3476 | ovec, nelem(ovec)) < 0) |
| 3477 | { |
| 3478 | DEBUG(D_expand) debug_printf("no match for SRS'd local-part pattern\n"); |
| 3479 | goto srs_result; |
| 3480 | } |
| 3481 | |
| 3482 | /* Side-effect: record the decoded recipient */ |
| 3483 | |
| 3484 | srs_recipient = string_sprintf("%.*S@%.*S", /* lowercased */ |
| 3485 | ovec[9]-ovec[8], sub[0] + ovec[8], /* substring 4 */ |
| 3486 | ovec[7]-ovec[6], sub[0] + ovec[6]); /* substring 3 */ |
| 3487 | |
| 3488 | /* If a zero-length secret was given, we're done. Otherwise carry on |
| 3489 | and validate the given SRS local_part againt our secret. */ |
| 3490 | |
| 3491 | if (!*sub[1]) |
| 3492 | { |
| 3493 | boolvalue = TRUE; |
| 3494 | goto srs_result; |
| 3495 | } |
| 3496 | |
| 3497 | /* check the timestamp */ |
| 3498 | { |
| 3499 | struct timeval now; |
| 3500 | uschar * ss = sub[0] + ovec[4]; /* substring 2, the timestamp */ |
| 3501 | long d; |
| 3502 | |
| 3503 | gettimeofday(&now, NULL); |
| 3504 | now.tv_sec /= 86400; /* days since epoch */ |
| 3505 | |
| 3506 | /* Decode substring 2 from base32 to a number */ |
| 3507 | |
| 3508 | for (d = 0, n = ovec[5]-ovec[4]; n; n--) |
| 3509 | { |
| 3510 | uschar * t = Ustrchr(base32_chars, *ss++); |
| 3511 | d = d * 32 + (t - base32_chars); |
| 3512 | } |
| 3513 | |
| 3514 | if (((now.tv_sec - d) & 0x3ff) > 10) /* days since SRS generated */ |
| 3515 | { |
| 3516 | DEBUG(D_expand) debug_printf("SRS too old\n"); |
| 3517 | goto srs_result; |
| 3518 | } |
| 3519 | } |
| 3520 | |
| 3521 | /* check length of substring 1, the offered checksum */ |
| 3522 | |
| 3523 | if (ovec[3]-ovec[2] != 4) |
| 3524 | { |
| 3525 | DEBUG(D_expand) debug_printf("SRS checksum wrong size\n"); |
| 3526 | goto srs_result; |
| 3527 | } |
| 3528 | |
| 3529 | /* Hash the address with our secret, and compare that computed checksum |
| 3530 | with the one extracted from the arg */ |
| 3531 | |
| 3532 | hmac_md5(sub[1], srs_recipient, cksum, sizeof(cksum)); |
| 3533 | if (Ustrncmp(cksum, sub[0] + ovec[2], 4) != 0) |
| 3534 | { |
| 3535 | DEBUG(D_expand) debug_printf("SRS checksum mismatch\n"); |
| 3536 | goto srs_result; |
| 3537 | } |
| 3538 | boolvalue = TRUE; |
| 3539 | |
| 3540 | srs_result: |
| 3541 | if (yield) *yield = (boolvalue == testfor); |
| 3542 | return s; |
| 3543 | } |
| 3544 | #endif /*EXPERIMENTAL_SRS_NATIVE*/ |
| 3545 | |
| 3546 | /* Unknown condition */ |
| 3547 | |
| 3548 | default: |
| 3549 | if (!expand_string_message || !*expand_string_message) |
| 3550 | expand_string_message = string_sprintf("unknown condition \"%s\"", opname); |
| 3551 | return NULL; |
| 3552 | } /* End switch on condition type */ |
| 3553 | |
| 3554 | /* Missing braces at start and end of data */ |
| 3555 | |
| 3556 | COND_FAILED_CURLY_START: |
| 3557 | expand_string_message = string_sprintf("missing { after \"%s\"", opname); |
| 3558 | return NULL; |
| 3559 | |
| 3560 | COND_FAILED_CURLY_END: |
| 3561 | expand_string_message = string_sprintf("missing } at end of \"%s\" condition", |
| 3562 | opname); |
| 3563 | return NULL; |
| 3564 | |
| 3565 | /* A condition requires code that is not compiled */ |
| 3566 | |
| 3567 | #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \ |
| 3568 | !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \ |
| 3569 | !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET) |
| 3570 | COND_FAILED_NOT_COMPILED: |
| 3571 | expand_string_message = string_sprintf("support for \"%s\" not compiled", |
| 3572 | opname); |
| 3573 | return NULL; |
| 3574 | #endif |
| 3575 | } |
| 3576 | |
| 3577 | |
| 3578 | |
| 3579 | |
| 3580 | /************************************************* |
| 3581 | * Save numerical variables * |
| 3582 | *************************************************/ |
| 3583 | |
| 3584 | /* This function is called from items such as "if" that want to preserve and |
| 3585 | restore the numbered variables. |
| 3586 | |
| 3587 | Arguments: |
| 3588 | save_expand_string points to an array of pointers to set |
| 3589 | save_expand_nlength points to an array of ints for the lengths |
| 3590 | |
| 3591 | Returns: the value of expand max to save |
| 3592 | */ |
| 3593 | |
| 3594 | static int |
| 3595 | save_expand_strings(uschar **save_expand_nstring, int *save_expand_nlength) |
| 3596 | { |
| 3597 | for (int i = 0; i <= expand_nmax; i++) |
| 3598 | { |
| 3599 | save_expand_nstring[i] = expand_nstring[i]; |
| 3600 | save_expand_nlength[i] = expand_nlength[i]; |
| 3601 | } |
| 3602 | return expand_nmax; |
| 3603 | } |
| 3604 | |
| 3605 | |
| 3606 | |
| 3607 | /************************************************* |
| 3608 | * Restore numerical variables * |
| 3609 | *************************************************/ |
| 3610 | |
| 3611 | /* This function restored saved values of numerical strings. |
| 3612 | |
| 3613 | Arguments: |
| 3614 | save_expand_nmax the number of strings to restore |
| 3615 | save_expand_string points to an array of pointers |
| 3616 | save_expand_nlength points to an array of ints |
| 3617 | |
| 3618 | Returns: nothing |
| 3619 | */ |
| 3620 | |
| 3621 | static void |
| 3622 | restore_expand_strings(int save_expand_nmax, uschar **save_expand_nstring, |
| 3623 | int *save_expand_nlength) |
| 3624 | { |
| 3625 | expand_nmax = save_expand_nmax; |
| 3626 | for (int i = 0; i <= expand_nmax; i++) |
| 3627 | { |
| 3628 | expand_nstring[i] = save_expand_nstring[i]; |
| 3629 | expand_nlength[i] = save_expand_nlength[i]; |
| 3630 | } |
| 3631 | } |
| 3632 | |
| 3633 | |
| 3634 | |
| 3635 | |
| 3636 | |
| 3637 | /************************************************* |
| 3638 | * Handle yes/no substrings * |
| 3639 | *************************************************/ |
| 3640 | |
| 3641 | /* This function is used by ${if}, ${lookup} and ${extract} to handle the |
| 3642 | alternative substrings that depend on whether or not the condition was true, |
| 3643 | or the lookup or extraction succeeded. The substrings always have to be |
| 3644 | expanded, to check their syntax, but "skipping" is set when the result is not |
| 3645 | needed - this avoids unnecessary nested lookups. |
| 3646 | |
| 3647 | Arguments: |
| 3648 | skipping TRUE if we were skipping when this item was reached |
| 3649 | yes TRUE if the first string is to be used, else use the second |
| 3650 | save_lookup a value to put back into lookup_value before the 2nd expansion |
| 3651 | sptr points to the input string pointer |
| 3652 | yieldptr points to the output growable-string pointer |
| 3653 | type "lookup", "if", "extract", "run", "env", "listextract" or |
| 3654 | "certextract" for error message |
| 3655 | resetok if not NULL, pointer to flag - write FALSE if unsafe to reset |
| 3656 | the store. |
| 3657 | |
| 3658 | Returns: 0 OK; lookup_value has been reset to save_lookup |
| 3659 | 1 expansion failed |
| 3660 | 2 expansion failed because of bracketing error |
| 3661 | */ |
| 3662 | |
| 3663 | static int |
| 3664 | process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, const uschar **sptr, |
| 3665 | gstring ** yieldptr, uschar *type, BOOL *resetok) |
| 3666 | { |
| 3667 | int rc = 0; |
| 3668 | const uschar *s = *sptr; /* Local value */ |
| 3669 | uschar *sub1, *sub2; |
| 3670 | const uschar * errwhere; |
| 3671 | |
| 3672 | /* If there are no following strings, we substitute the contents of $value for |
| 3673 | lookups and for extractions in the success case. For the ${if item, the string |
| 3674 | "true" is substituted. In the fail case, nothing is substituted for all three |
| 3675 | items. */ |
| 3676 | |
| 3677 | while (isspace(*s)) s++; |
| 3678 | if (*s == '}') |
| 3679 | { |
| 3680 | if (type[0] == 'i') |
| 3681 | { |
| 3682 | if (yes && !skipping) |
| 3683 | *yieldptr = string_catn(*yieldptr, US"true", 4); |
| 3684 | } |
| 3685 | else |
| 3686 | { |
| 3687 | if (yes && lookup_value && !skipping) |
| 3688 | *yieldptr = string_cat(*yieldptr, lookup_value); |
| 3689 | lookup_value = save_lookup; |
| 3690 | } |
| 3691 | s++; |
| 3692 | goto RETURN; |
| 3693 | } |
| 3694 | |
| 3695 | /* The first following string must be braced. */ |
| 3696 | |
| 3697 | if (*s++ != '{') |
| 3698 | { |
| 3699 | errwhere = US"'yes' part did not start with '{'"; |
| 3700 | goto FAILED_CURLY; |
| 3701 | } |
| 3702 | |
| 3703 | /* Expand the first substring. Forced failures are noticed only if we actually |
| 3704 | want this string. Set skipping in the call in the fail case (this will always |
| 3705 | be the case if we were already skipping). */ |
| 3706 | |
| 3707 | sub1 = expand_string_internal(s, TRUE, &s, !yes, TRUE, resetok); |
| 3708 | if (sub1 == NULL && (yes || !f.expand_string_forcedfail)) goto FAILED; |
| 3709 | f.expand_string_forcedfail = FALSE; |
| 3710 | if (*s++ != '}') |
| 3711 | { |
| 3712 | errwhere = US"'yes' part did not end with '}'"; |
| 3713 | goto FAILED_CURLY; |
| 3714 | } |
| 3715 | |
| 3716 | /* If we want the first string, add it to the output */ |
| 3717 | |
| 3718 | if (yes) |
| 3719 | *yieldptr = string_cat(*yieldptr, sub1); |
| 3720 | |
| 3721 | /* If this is called from a lookup/env or a (cert)extract, we want to restore |
| 3722 | $value to what it was at the start of the item, so that it has this value |
| 3723 | during the second string expansion. For the call from "if" or "run" to this |
| 3724 | function, save_lookup is set to lookup_value, so that this statement does |
| 3725 | nothing. */ |
| 3726 | |
| 3727 | lookup_value = save_lookup; |
| 3728 | |
| 3729 | /* There now follows either another substring, or "fail", or nothing. This |
| 3730 | time, forced failures are noticed only if we want the second string. We must |
| 3731 | set skipping in the nested call if we don't want this string, or if we were |
| 3732 | already skipping. */ |
| 3733 | |
| 3734 | while (isspace(*s)) s++; |
| 3735 | if (*s == '{') |
| 3736 | { |
| 3737 | sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping, TRUE, resetok); |
| 3738 | if (sub2 == NULL && (!yes || !f.expand_string_forcedfail)) goto FAILED; |
| 3739 | f.expand_string_forcedfail = FALSE; |
| 3740 | if (*s++ != '}') |
| 3741 | { |
| 3742 | errwhere = US"'no' part did not start with '{'"; |
| 3743 | goto FAILED_CURLY; |
| 3744 | } |
| 3745 | |
| 3746 | /* If we want the second string, add it to the output */ |
| 3747 | |
| 3748 | if (!yes) |
| 3749 | *yieldptr = string_cat(*yieldptr, sub2); |
| 3750 | } |
| 3751 | |
| 3752 | /* If there is no second string, but the word "fail" is present when the use of |
| 3753 | the second string is wanted, set a flag indicating it was a forced failure |
| 3754 | rather than a syntactic error. Swallow the terminating } in case this is nested |
| 3755 | inside another lookup or if or extract. */ |
| 3756 | |
| 3757 | else if (*s != '}') |
| 3758 | { |
| 3759 | uschar name[256]; |
| 3760 | /* deconst cast ok here as source is s anyway */ |
| 3761 | s = US read_name(name, sizeof(name), s, US"_"); |
| 3762 | if (Ustrcmp(name, "fail") == 0) |
| 3763 | { |
| 3764 | if (!yes && !skipping) |
| 3765 | { |
| 3766 | while (isspace(*s)) s++; |
| 3767 | if (*s++ != '}') |
| 3768 | { |
| 3769 | errwhere = US"did not close with '}' after forcedfail"; |
| 3770 | goto FAILED_CURLY; |
| 3771 | } |
| 3772 | expand_string_message = |
| 3773 | string_sprintf("\"%s\" failed and \"fail\" requested", type); |
| 3774 | f.expand_string_forcedfail = TRUE; |
| 3775 | goto FAILED; |
| 3776 | } |
| 3777 | } |
| 3778 | else |
| 3779 | { |
| 3780 | expand_string_message = |
| 3781 | string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type); |
| 3782 | goto FAILED; |
| 3783 | } |
| 3784 | } |
| 3785 | |
| 3786 | /* All we have to do now is to check on the final closing brace. */ |
| 3787 | |
| 3788 | while (isspace(*s)) s++; |
| 3789 | if (*s++ != '}') |
| 3790 | { |
| 3791 | errwhere = US"did not close with '}'"; |
| 3792 | goto FAILED_CURLY; |
| 3793 | } |
| 3794 | |
| 3795 | |
| 3796 | RETURN: |
| 3797 | /* Update the input pointer value before returning */ |
| 3798 | *sptr = s; |
| 3799 | return rc; |
| 3800 | |
| 3801 | FAILED_CURLY: |
| 3802 | /* Get here if there is a bracketing failure */ |
| 3803 | expand_string_message = string_sprintf( |
| 3804 | "curly-bracket problem in conditional yes/no parsing: %s\n" |
| 3805 | " remaining string is '%s'", errwhere, --s); |
| 3806 | rc = 2; |
| 3807 | goto RETURN; |
| 3808 | |
| 3809 | FAILED: |
| 3810 | /* Get here for other failures */ |
| 3811 | rc = 1; |
| 3812 | goto RETURN; |
| 3813 | } |
| 3814 | |
| 3815 | |
| 3816 | |
| 3817 | |
| 3818 | /******************************************************** |
| 3819 | * prvs: Get last three digits of days since Jan 1, 1970 * |
| 3820 | ********************************************************/ |
| 3821 | |
| 3822 | /* This is needed to implement the "prvs" BATV reverse |
| 3823 | path signing scheme |
| 3824 | |
| 3825 | Argument: integer "days" offset to add or substract to |
| 3826 | or from the current number of days. |
| 3827 | |
| 3828 | Returns: pointer to string containing the last three |
| 3829 | digits of the number of days since Jan 1, 1970, |
| 3830 | modified by the offset argument, NULL if there |
| 3831 | was an error in the conversion. |
| 3832 | |
| 3833 | */ |
| 3834 | |
| 3835 | static uschar * |
| 3836 | prvs_daystamp(int day_offset) |
| 3837 | { |
| 3838 | uschar *days = store_get(32, FALSE); /* Need at least 24 for cases */ |
| 3839 | (void)string_format(days, 32, TIME_T_FMT, /* where TIME_T_FMT is %lld */ |
| 3840 | (time(NULL) + day_offset*86400)/86400); |
| 3841 | return (Ustrlen(days) >= 3) ? &days[Ustrlen(days)-3] : US"100"; |
| 3842 | } |
| 3843 | |
| 3844 | |
| 3845 | |
| 3846 | /******************************************************** |
| 3847 | * prvs: perform HMAC-SHA1 computation of prvs bits * |
| 3848 | ********************************************************/ |
| 3849 | |
| 3850 | /* This is needed to implement the "prvs" BATV reverse |
| 3851 | path signing scheme |
| 3852 | |
| 3853 | Arguments: |
| 3854 | address RFC2821 Address to use |
| 3855 | key The key to use (must be less than 64 characters |
| 3856 | in size) |
| 3857 | key_num Single-digit key number to use. Defaults to |
| 3858 | '0' when NULL. |
| 3859 | |
| 3860 | Returns: pointer to string containing the first three |
| 3861 | bytes of the final hash in hex format, NULL if |
| 3862 | there was an error in the process. |
| 3863 | */ |
| 3864 | |
| 3865 | static uschar * |
| 3866 | prvs_hmac_sha1(uschar *address, uschar *key, uschar *key_num, uschar *daystamp) |
| 3867 | { |
| 3868 | gstring * hash_source; |
| 3869 | uschar * p; |
| 3870 | hctx h; |
| 3871 | uschar innerhash[20]; |
| 3872 | uschar finalhash[20]; |
| 3873 | uschar innerkey[64]; |
| 3874 | uschar outerkey[64]; |
| 3875 | uschar *finalhash_hex; |
| 3876 | |
| 3877 | if (!key_num) |
| 3878 | key_num = US"0"; |
| 3879 | |
| 3880 | if (Ustrlen(key) > 64) |
| 3881 | return NULL; |
| 3882 | |
| 3883 | hash_source = string_catn(NULL, key_num, 1); |
| 3884 | hash_source = string_catn(hash_source, daystamp, 3); |
| 3885 | hash_source = string_cat(hash_source, address); |
| 3886 | (void) string_from_gstring(hash_source); |
| 3887 | |
| 3888 | DEBUG(D_expand) |
| 3889 | debug_printf_indent("prvs: hash source is '%s'\n", hash_source->s); |
| 3890 | |
| 3891 | memset(innerkey, 0x36, 64); |
| 3892 | memset(outerkey, 0x5c, 64); |
| 3893 | |
| 3894 | for (int i = 0; i < Ustrlen(key); i++) |
| 3895 | { |
| 3896 | innerkey[i] ^= key[i]; |
| 3897 | outerkey[i] ^= key[i]; |
| 3898 | } |
| 3899 | |
| 3900 | chash_start(HMAC_SHA1, &h); |
| 3901 | chash_mid(HMAC_SHA1, &h, innerkey); |
| 3902 | chash_end(HMAC_SHA1, &h, hash_source->s, hash_source->ptr, innerhash); |
| 3903 | |
| 3904 | chash_start(HMAC_SHA1, &h); |
| 3905 | chash_mid(HMAC_SHA1, &h, outerkey); |
| 3906 | chash_end(HMAC_SHA1, &h, innerhash, 20, finalhash); |
| 3907 | |
| 3908 | /* Hashing is deemed sufficient to de-taint any input data */ |
| 3909 | |
| 3910 | p = finalhash_hex = store_get(40, FALSE); |
| 3911 | for (int i = 0; i < 3; i++) |
| 3912 | { |
| 3913 | *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4]; |
| 3914 | *p++ = hex_digits[finalhash[i] & 0x0f]; |
| 3915 | } |
| 3916 | *p = '\0'; |
| 3917 | |
| 3918 | return finalhash_hex; |
| 3919 | } |
| 3920 | |
| 3921 | |
| 3922 | |
| 3923 | |
| 3924 | /************************************************* |
| 3925 | * Join a file onto the output string * |
| 3926 | *************************************************/ |
| 3927 | |
| 3928 | /* This is used for readfile/readsock and after a run expansion. |
| 3929 | It joins the contents of a file onto the output string, globally replacing |
| 3930 | newlines with a given string (optionally). |
| 3931 | |
| 3932 | Arguments: |
| 3933 | f the FILE |
| 3934 | yield pointer to the expandable string struct |
| 3935 | eol newline replacement string, or NULL |
| 3936 | |
| 3937 | Returns: new pointer for expandable string, terminated if non-null |
| 3938 | */ |
| 3939 | |
| 3940 | static gstring * |
| 3941 | cat_file(FILE *f, gstring *yield, uschar *eol) |
| 3942 | { |
| 3943 | uschar buffer[1024]; |
| 3944 | |
| 3945 | while (Ufgets(buffer, sizeof(buffer), f)) |
| 3946 | { |
| 3947 | int len = Ustrlen(buffer); |
| 3948 | if (eol && buffer[len-1] == '\n') len--; |
| 3949 | yield = string_catn(yield, buffer, len); |
| 3950 | if (eol && buffer[len]) |
| 3951 | yield = string_cat(yield, eol); |
| 3952 | } |
| 3953 | |
| 3954 | (void) string_from_gstring(yield); |
| 3955 | return yield; |
| 3956 | } |
| 3957 | |
| 3958 | |
| 3959 | #ifndef DISABLE_TLS |
| 3960 | static gstring * |
| 3961 | cat_file_tls(void * tls_ctx, gstring * yield, uschar * eol) |
| 3962 | { |
| 3963 | int rc; |
| 3964 | uschar buffer[1024]; |
| 3965 | |
| 3966 | /*XXX could we read direct into a pre-grown string? */ |
| 3967 | |
| 3968 | while ((rc = tls_read(tls_ctx, buffer, sizeof(buffer))) > 0) |
| 3969 | for (uschar * s = buffer; rc--; s++) |
| 3970 | yield = eol && *s == '\n' |
| 3971 | ? string_cat(yield, eol) : string_catn(yield, s, 1); |
| 3972 | |
| 3973 | /* We assume that all errors, and any returns of zero bytes, |
| 3974 | are actually EOF. */ |
| 3975 | |
| 3976 | (void) string_from_gstring(yield); |
| 3977 | return yield; |
| 3978 | } |
| 3979 | #endif |
| 3980 | |
| 3981 | |
| 3982 | /************************************************* |
| 3983 | * Evaluate numeric expression * |
| 3984 | *************************************************/ |
| 3985 | |
| 3986 | /* This is a set of mutually recursive functions that evaluate an arithmetic |
| 3987 | expression involving + - * / % & | ^ ~ << >> and parentheses. The only one of |
| 3988 | these functions that is called from elsewhere is eval_expr, whose interface is: |
| 3989 | |
| 3990 | Arguments: |
| 3991 | sptr pointer to the pointer to the string - gets updated |
| 3992 | decimal TRUE if numbers are to be assumed decimal |
| 3993 | error pointer to where to put an error message - must be NULL on input |
| 3994 | endket TRUE if ')' must terminate - FALSE for external call |
| 3995 | |
| 3996 | Returns: on success: the value of the expression, with *error still NULL |
| 3997 | on failure: an undefined value, with *error = a message |
| 3998 | */ |
| 3999 | |
| 4000 | static int_eximarith_t eval_op_or(uschar **, BOOL, uschar **); |
| 4001 | |
| 4002 | |
| 4003 | static int_eximarith_t |
| 4004 | eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket) |
| 4005 | { |
| 4006 | uschar *s = *sptr; |
| 4007 | int_eximarith_t x = eval_op_or(&s, decimal, error); |
| 4008 | |
| 4009 | if (!*error) |
| 4010 | if (endket) |
| 4011 | if (*s != ')') |
| 4012 | *error = US"expecting closing parenthesis"; |
| 4013 | else |
| 4014 | while (isspace(*(++s))); |
| 4015 | else if (*s) |
| 4016 | *error = US"expecting operator"; |
| 4017 | *sptr = s; |
| 4018 | return x; |
| 4019 | } |
| 4020 | |
| 4021 | |
| 4022 | static int_eximarith_t |
| 4023 | eval_number(uschar **sptr, BOOL decimal, uschar **error) |
| 4024 | { |
| 4025 | int c; |
| 4026 | int_eximarith_t n; |
| 4027 | uschar *s = *sptr; |
| 4028 | |
| 4029 | while (isspace(*s)) s++; |
| 4030 | if (isdigit((c = *s))) |
| 4031 | { |
| 4032 | int count; |
| 4033 | (void)sscanf(CS s, (decimal? SC_EXIM_DEC "%n" : SC_EXIM_ARITH "%n"), &n, &count); |
| 4034 | s += count; |
| 4035 | switch (tolower(*s)) |
| 4036 | { |
| 4037 | default: break; |
| 4038 | case 'k': n *= 1024; s++; break; |
| 4039 | case 'm': n *= 1024*1024; s++; break; |
| 4040 | case 'g': n *= 1024*1024*1024; s++; break; |
| 4041 | } |
| 4042 | while (isspace (*s)) s++; |
| 4043 | } |
| 4044 | else if (c == '(') |
| 4045 | { |
| 4046 | s++; |
| 4047 | n = eval_expr(&s, decimal, error, 1); |
| 4048 | } |
| 4049 | else |
| 4050 | { |
| 4051 | *error = US"expecting number or opening parenthesis"; |
| 4052 | n = 0; |
| 4053 | } |
| 4054 | *sptr = s; |
| 4055 | return n; |
| 4056 | } |
| 4057 | |
| 4058 | |
| 4059 | static int_eximarith_t |
| 4060 | eval_op_unary(uschar **sptr, BOOL decimal, uschar **error) |
| 4061 | { |
| 4062 | uschar *s = *sptr; |
| 4063 | int_eximarith_t x; |
| 4064 | while (isspace(*s)) s++; |
| 4065 | if (*s == '+' || *s == '-' || *s == '~') |
| 4066 | { |
| 4067 | int op = *s++; |
| 4068 | x = eval_op_unary(&s, decimal, error); |
| 4069 | if (op == '-') x = -x; |
| 4070 | else if (op == '~') x = ~x; |
| 4071 | } |
| 4072 | else |
| 4073 | x = eval_number(&s, decimal, error); |
| 4074 | |
| 4075 | *sptr = s; |
| 4076 | return x; |
| 4077 | } |
| 4078 | |
| 4079 | |
| 4080 | static int_eximarith_t |
| 4081 | eval_op_mult(uschar **sptr, BOOL decimal, uschar **error) |
| 4082 | { |
| 4083 | uschar *s = *sptr; |
| 4084 | int_eximarith_t x = eval_op_unary(&s, decimal, error); |
| 4085 | if (!*error) |
| 4086 | { |
| 4087 | while (*s == '*' || *s == '/' || *s == '%') |
| 4088 | { |
| 4089 | int op = *s++; |
| 4090 | int_eximarith_t y = eval_op_unary(&s, decimal, error); |
| 4091 | if (*error) break; |
| 4092 | /* SIGFPE both on div/mod by zero and on INT_MIN / -1, which would give |
| 4093 | * a value of INT_MAX+1. Note that INT_MIN * -1 gives INT_MIN for me, which |
| 4094 | * is a bug somewhere in [gcc 4.2.1, FreeBSD, amd64]. In fact, -N*-M where |
| 4095 | * -N*M is INT_MIN will yield INT_MIN. |
| 4096 | * Since we don't support floating point, this is somewhat simpler. |
| 4097 | * Ideally, we'd return an error, but since we overflow for all other |
| 4098 | * arithmetic, consistency suggests otherwise, but what's the correct value |
| 4099 | * to use? There is none. |
| 4100 | * The C standard guarantees overflow for unsigned arithmetic but signed |
| 4101 | * overflow invokes undefined behaviour; in practice, this is overflow |
| 4102 | * except for converting INT_MIN to INT_MAX+1. We also can't guarantee |
| 4103 | * that long/longlong larger than int are available, or we could just work |
| 4104 | * with larger types. We should consider whether to guarantee 32bit eval |
| 4105 | * and 64-bit working variables, with errors returned. For now ... |
| 4106 | * So, the only SIGFPEs occur with a non-shrinking div/mod, thus -1; we |
| 4107 | * can just let the other invalid results occur otherwise, as they have |
| 4108 | * until now. For this one case, we can coerce. |
| 4109 | */ |
| 4110 | if (y == -1 && x == EXIM_ARITH_MIN && op != '*') |
| 4111 | { |
| 4112 | DEBUG(D_expand) |
| 4113 | debug_printf("Integer exception dodging: " PR_EXIM_ARITH "%c-1 coerced to " PR_EXIM_ARITH "\n", |
| 4114 | EXIM_ARITH_MIN, op, EXIM_ARITH_MAX); |
| 4115 | x = EXIM_ARITH_MAX; |
| 4116 | continue; |
| 4117 | } |
| 4118 | if (op == '*') |
| 4119 | x *= y; |
| 4120 | else |
| 4121 | { |
| 4122 | if (y == 0) |
| 4123 | { |
| 4124 | *error = (op == '/') ? US"divide by zero" : US"modulo by zero"; |
| 4125 | x = 0; |
| 4126 | break; |
| 4127 | } |
| 4128 | if (op == '/') |
| 4129 | x /= y; |
| 4130 | else |
| 4131 | x %= y; |
| 4132 | } |
| 4133 | } |
| 4134 | } |
| 4135 | *sptr = s; |
| 4136 | return x; |
| 4137 | } |
| 4138 | |
| 4139 | |
| 4140 | static int_eximarith_t |
| 4141 | eval_op_sum(uschar **sptr, BOOL decimal, uschar **error) |
| 4142 | { |
| 4143 | uschar *s = *sptr; |
| 4144 | int_eximarith_t x = eval_op_mult(&s, decimal, error); |
| 4145 | if (!*error) |
| 4146 | { |
| 4147 | while (*s == '+' || *s == '-') |
| 4148 | { |
| 4149 | int op = *s++; |
| 4150 | int_eximarith_t y = eval_op_mult(&s, decimal, error); |
| 4151 | if (*error) break; |
| 4152 | if ( (x >= EXIM_ARITH_MAX/2 && x >= EXIM_ARITH_MAX/2) |
| 4153 | || (x <= -(EXIM_ARITH_MAX/2) && y <= -(EXIM_ARITH_MAX/2))) |
| 4154 | { /* over-conservative check */ |
| 4155 | *error = op == '+' |
| 4156 | ? US"overflow in sum" : US"overflow in difference"; |
| 4157 | break; |
| 4158 | } |
| 4159 | if (op == '+') x += y; else x -= y; |
| 4160 | } |
| 4161 | } |
| 4162 | *sptr = s; |
| 4163 | return x; |
| 4164 | } |
| 4165 | |
| 4166 | |
| 4167 | static int_eximarith_t |
| 4168 | eval_op_shift(uschar **sptr, BOOL decimal, uschar **error) |
| 4169 | { |
| 4170 | uschar *s = *sptr; |
| 4171 | int_eximarith_t x = eval_op_sum(&s, decimal, error); |
| 4172 | if (!*error) |
| 4173 | { |
| 4174 | while ((*s == '<' || *s == '>') && s[1] == s[0]) |
| 4175 | { |
| 4176 | int_eximarith_t y; |
| 4177 | int op = *s++; |
| 4178 | s++; |
| 4179 | y = eval_op_sum(&s, decimal, error); |
| 4180 | if (*error) break; |
| 4181 | if (op == '<') x <<= y; else x >>= y; |
| 4182 | } |
| 4183 | } |
| 4184 | *sptr = s; |
| 4185 | return x; |
| 4186 | } |
| 4187 | |
| 4188 | |
| 4189 | static int_eximarith_t |
| 4190 | eval_op_and(uschar **sptr, BOOL decimal, uschar **error) |
| 4191 | { |
| 4192 | uschar *s = *sptr; |
| 4193 | int_eximarith_t x = eval_op_shift(&s, decimal, error); |
| 4194 | if (!*error) |
| 4195 | { |
| 4196 | while (*s == '&') |
| 4197 | { |
| 4198 | int_eximarith_t y; |
| 4199 | s++; |
| 4200 | y = eval_op_shift(&s, decimal, error); |
| 4201 | if (*error) break; |
| 4202 | x &= y; |
| 4203 | } |
| 4204 | } |
| 4205 | *sptr = s; |
| 4206 | return x; |
| 4207 | } |
| 4208 | |
| 4209 | |
| 4210 | static int_eximarith_t |
| 4211 | eval_op_xor(uschar **sptr, BOOL decimal, uschar **error) |
| 4212 | { |
| 4213 | uschar *s = *sptr; |
| 4214 | int_eximarith_t x = eval_op_and(&s, decimal, error); |
| 4215 | if (!*error) |
| 4216 | { |
| 4217 | while (*s == '^') |
| 4218 | { |
| 4219 | int_eximarith_t y; |
| 4220 | s++; |
| 4221 | y = eval_op_and(&s, decimal, error); |
| 4222 | if (*error) break; |
| 4223 | x ^= y; |
| 4224 | } |
| 4225 | } |
| 4226 | *sptr = s; |
| 4227 | return x; |
| 4228 | } |
| 4229 | |
| 4230 | |
| 4231 | static int_eximarith_t |
| 4232 | eval_op_or(uschar **sptr, BOOL decimal, uschar **error) |
| 4233 | { |
| 4234 | uschar *s = *sptr; |
| 4235 | int_eximarith_t x = eval_op_xor(&s, decimal, error); |
| 4236 | if (!*error) |
| 4237 | { |
| 4238 | while (*s == '|') |
| 4239 | { |
| 4240 | int_eximarith_t y; |
| 4241 | s++; |
| 4242 | y = eval_op_xor(&s, decimal, error); |
| 4243 | if (*error) break; |
| 4244 | x |= y; |
| 4245 | } |
| 4246 | } |
| 4247 | *sptr = s; |
| 4248 | return x; |
| 4249 | } |
| 4250 | |
| 4251 | |
| 4252 | |
| 4253 | /************************************************/ |
| 4254 | /* Comparison operation for sort expansion. We need to avoid |
| 4255 | re-expanding the fields being compared, so need a custom routine. |
| 4256 | |
| 4257 | Arguments: |
| 4258 | cond_type Comparison operator code |
| 4259 | leftarg, rightarg Arguments for comparison |
| 4260 | |
| 4261 | Return true iff (leftarg compare rightarg) |
| 4262 | */ |
| 4263 | |
| 4264 | static BOOL |
| 4265 | sortsbefore(int cond_type, BOOL alpha_cond, |
| 4266 | const uschar * leftarg, const uschar * rightarg) |
| 4267 | { |
| 4268 | int_eximarith_t l_num, r_num; |
| 4269 | |
| 4270 | if (!alpha_cond) |
| 4271 | { |
| 4272 | l_num = expanded_string_integer(leftarg, FALSE); |
| 4273 | if (expand_string_message) return FALSE; |
| 4274 | r_num = expanded_string_integer(rightarg, FALSE); |
| 4275 | if (expand_string_message) return FALSE; |
| 4276 | |
| 4277 | switch (cond_type) |
| 4278 | { |
| 4279 | case ECOND_NUM_G: return l_num > r_num; |
| 4280 | case ECOND_NUM_GE: return l_num >= r_num; |
| 4281 | case ECOND_NUM_L: return l_num < r_num; |
| 4282 | case ECOND_NUM_LE: return l_num <= r_num; |
| 4283 | default: break; |
| 4284 | } |
| 4285 | } |
| 4286 | else |
| 4287 | switch (cond_type) |
| 4288 | { |
| 4289 | case ECOND_STR_LT: return Ustrcmp (leftarg, rightarg) < 0; |
| 4290 | case ECOND_STR_LTI: return strcmpic(leftarg, rightarg) < 0; |
| 4291 | case ECOND_STR_LE: return Ustrcmp (leftarg, rightarg) <= 0; |
| 4292 | case ECOND_STR_LEI: return strcmpic(leftarg, rightarg) <= 0; |
| 4293 | case ECOND_STR_GT: return Ustrcmp (leftarg, rightarg) > 0; |
| 4294 | case ECOND_STR_GTI: return strcmpic(leftarg, rightarg) > 0; |
| 4295 | case ECOND_STR_GE: return Ustrcmp (leftarg, rightarg) >= 0; |
| 4296 | case ECOND_STR_GEI: return strcmpic(leftarg, rightarg) >= 0; |
| 4297 | default: break; |
| 4298 | } |
| 4299 | return FALSE; /* should not happen */ |
| 4300 | } |
| 4301 | |
| 4302 | |
| 4303 | /************************************************* |
| 4304 | * Expand string * |
| 4305 | *************************************************/ |
| 4306 | |
| 4307 | /* Returns either an unchanged string, or the expanded string in stacking pool |
| 4308 | store. Interpreted sequences are: |
| 4309 | |
| 4310 | \... normal escaping rules |
| 4311 | $name substitutes the variable |
| 4312 | ${name} ditto |
| 4313 | ${op:string} operates on the expanded string value |
| 4314 | ${item{arg1}{arg2}...} expands the args and then does the business |
| 4315 | some literal args are not enclosed in {} |
| 4316 | |
| 4317 | There are now far too many operators and item types to make it worth listing |
| 4318 | them here in detail any more. |
| 4319 | |
| 4320 | We use an internal routine recursively to handle embedded substrings. The |
| 4321 | external function follows. The yield is NULL if the expansion failed, and there |
| 4322 | are two cases: if something collapsed syntactically, or if "fail" was given |
| 4323 | as the action on a lookup failure. These can be distinguished by looking at the |
| 4324 | variable expand_string_forcedfail, which is TRUE in the latter case. |
| 4325 | |
| 4326 | The skipping flag is set true when expanding a substring that isn't actually |
| 4327 | going to be used (after "if" or "lookup") and it prevents lookups from |
| 4328 | happening lower down. |
| 4329 | |
| 4330 | Store usage: At start, a store block of the length of the input plus 64 |
| 4331 | is obtained. This is expanded as necessary by string_cat(), which might have to |
| 4332 | get a new block, or might be able to expand the original. At the end of the |
| 4333 | function we can release any store above that portion of the yield block that |
| 4334 | was actually used. In many cases this will be optimal. |
| 4335 | |
| 4336 | However: if the first item in the expansion is a variable name or header name, |
| 4337 | we reset the store before processing it; if the result is in fresh store, we |
| 4338 | use that without copying. This is helpful for expanding strings like |
| 4339 | $message_headers which can get very long. |
| 4340 | |
| 4341 | There's a problem if a ${dlfunc item has side-effects that cause allocation, |
| 4342 | since resetting the store at the end of the expansion will free store that was |
| 4343 | allocated by the plugin code as well as the slop after the expanded string. So |
| 4344 | we skip any resets if ${dlfunc } has been used. The same applies for ${acl } |
| 4345 | and, given the acl condition, ${if }. This is an unfortunate consequence of |
| 4346 | string expansion becoming too powerful. |
| 4347 | |
| 4348 | Arguments: |
| 4349 | string the string to be expanded |
| 4350 | ket_ends true if expansion is to stop at } |
| 4351 | left if not NULL, a pointer to the first character after the |
| 4352 | expansion is placed here (typically used with ket_ends) |
| 4353 | skipping TRUE for recursive calls when the value isn't actually going |
| 4354 | to be used (to allow for optimisation) |
| 4355 | honour_dollar TRUE if $ is to be expanded, |
| 4356 | FALSE if it's just another character |
| 4357 | resetok_p if not NULL, pointer to flag - write FALSE if unsafe to reset |
| 4358 | the store. |
| 4359 | |
| 4360 | Returns: NULL if expansion fails: |
| 4361 | expand_string_forcedfail is set TRUE if failure was forced |
| 4362 | expand_string_message contains a textual error message |
| 4363 | a pointer to the expanded string on success |
| 4364 | */ |
| 4365 | |
| 4366 | static uschar * |
| 4367 | expand_string_internal(const uschar *string, BOOL ket_ends, const uschar **left, |
| 4368 | BOOL skipping, BOOL honour_dollar, BOOL *resetok_p) |
| 4369 | { |
| 4370 | rmark reset_point = store_mark(); |
| 4371 | gstring * yield = string_get(Ustrlen(string) + 64); |
| 4372 | int item_type; |
| 4373 | const uschar *s = string; |
| 4374 | uschar *save_expand_nstring[EXPAND_MAXN+1]; |
| 4375 | int save_expand_nlength[EXPAND_MAXN+1]; |
| 4376 | BOOL resetok = TRUE; |
| 4377 | |
| 4378 | expand_level++; |
| 4379 | DEBUG(D_expand) |
| 4380 | DEBUG(D_noutf8) |
| 4381 | debug_printf_indent("/%s: %s\n", |
| 4382 | skipping ? "---scanning" : "considering", string); |
| 4383 | else |
| 4384 | debug_printf_indent(UTF8_DOWN_RIGHT "%s: %s\n", |
| 4385 | skipping |
| 4386 | ? UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ "scanning" |
| 4387 | : "considering", |
| 4388 | string); |
| 4389 | |
| 4390 | f.expand_string_forcedfail = FALSE; |
| 4391 | expand_string_message = US""; |
| 4392 | |
| 4393 | if (is_tainted(string)) |
| 4394 | { |
| 4395 | expand_string_message = |
| 4396 | string_sprintf("attempt to expand tainted string '%s'", s); |
| 4397 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message); |
| 4398 | goto EXPAND_FAILED; |
| 4399 | } |
| 4400 | |
| 4401 | while (*s != 0) |
| 4402 | { |
| 4403 | uschar *value; |
| 4404 | uschar name[256]; |
| 4405 | |
| 4406 | /* \ escapes the next character, which must exist, or else |
| 4407 | the expansion fails. There's a special escape, \N, which causes |
| 4408 | copying of the subject verbatim up to the next \N. Otherwise, |
| 4409 | the escapes are the standard set. */ |
| 4410 | |
| 4411 | if (*s == '\\') |
| 4412 | { |
| 4413 | if (s[1] == 0) |
| 4414 | { |
| 4415 | expand_string_message = US"\\ at end of string"; |
| 4416 | goto EXPAND_FAILED; |
| 4417 | } |
| 4418 | |
| 4419 | if (s[1] == 'N') |
| 4420 | { |
| 4421 | const uschar * t = s + 2; |
| 4422 | for (s = t; *s != 0; s++) if (*s == '\\' && s[1] == 'N') break; |
| 4423 | yield = string_catn(yield, t, s - t); |
| 4424 | if (*s != 0) s += 2; |
| 4425 | } |
| 4426 | |
| 4427 | else |
| 4428 | { |
| 4429 | uschar ch[1]; |
| 4430 | ch[0] = string_interpret_escape(&s); |
| 4431 | s++; |
| 4432 | yield = string_catn(yield, ch, 1); |
| 4433 | } |
| 4434 | |
| 4435 | continue; |
| 4436 | } |
| 4437 | |
| 4438 | /*{*/ |
| 4439 | /* Anything other than $ is just copied verbatim, unless we are |
| 4440 | looking for a terminating } character. */ |
| 4441 | |
| 4442 | /*{*/ |
| 4443 | if (ket_ends && *s == '}') break; |
| 4444 | |
| 4445 | if (*s != '$' || !honour_dollar) |
| 4446 | { |
| 4447 | yield = string_catn(yield, s++, 1); |
| 4448 | continue; |
| 4449 | } |
| 4450 | |
| 4451 | /* No { after the $ - must be a plain name or a number for string |
| 4452 | match variable. There has to be a fudge for variables that are the |
| 4453 | names of header fields preceded by "$header_" because header field |
| 4454 | names can contain any printing characters except space and colon. |
| 4455 | For those that don't like typing this much, "$h_" is a synonym for |
| 4456 | "$header_". A non-existent header yields a NULL value; nothing is |
| 4457 | inserted. */ /*}*/ |
| 4458 | |
| 4459 | if (isalpha((*(++s)))) |
| 4460 | { |
| 4461 | int len; |
| 4462 | int newsize = 0; |
| 4463 | gstring * g = NULL; |
| 4464 | uschar * t; |
| 4465 | |
| 4466 | s = read_name(name, sizeof(name), s, US"_"); |
| 4467 | |
| 4468 | /* If this is the first thing to be expanded, release the pre-allocated |
| 4469 | buffer. */ |
| 4470 | |
| 4471 | if (!yield) |
| 4472 | g = store_get(sizeof(gstring), FALSE); |
| 4473 | else if (yield->ptr == 0) |
| 4474 | { |
| 4475 | if (resetok) reset_point = store_reset(reset_point); |
| 4476 | yield = NULL; |
| 4477 | reset_point = store_mark(); |
| 4478 | g = store_get(sizeof(gstring), FALSE); /* alloc _before_ calling find_variable() */ |
| 4479 | } |
| 4480 | |
| 4481 | /* Header */ |
| 4482 | |
| 4483 | if ( ( *(t = name) == 'h' |
| 4484 | || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h' |
| 4485 | ) |
| 4486 | && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0) |
| 4487 | ) |
| 4488 | { |
| 4489 | unsigned flags = *name == 'r' ? FH_WANT_RAW |
| 4490 | : *name == 'l' ? FH_WANT_RAW|FH_WANT_LIST |
| 4491 | : 0; |
| 4492 | uschar * charset = *name == 'b' ? NULL : headers_charset; |
| 4493 | |
| 4494 | s = read_header_name(name, sizeof(name), s); |
| 4495 | value = find_header(name, &newsize, flags, charset); |
| 4496 | |
| 4497 | /* If we didn't find the header, and the header contains a closing brace |
| 4498 | character, this may be a user error where the terminating colon |
| 4499 | has been omitted. Set a flag to adjust the error message in this case. |
| 4500 | But there is no error here - nothing gets inserted. */ |
| 4501 | |
| 4502 | if (!value) |
| 4503 | { |
| 4504 | if (Ustrchr(name, '}')) malformed_header = TRUE; |
| 4505 | continue; |
| 4506 | } |
| 4507 | } |
| 4508 | |
| 4509 | /* Variable */ |
| 4510 | |
| 4511 | else if (!(value = find_variable(name, FALSE, skipping, &newsize))) |
| 4512 | { |
| 4513 | expand_string_message = |
| 4514 | string_sprintf("unknown variable name \"%s\"", name); |
| 4515 | check_variable_error_message(name); |
| 4516 | goto EXPAND_FAILED; |
| 4517 | } |
| 4518 | |
| 4519 | /* If the data is known to be in a new buffer, newsize will be set to the |
| 4520 | size of that buffer. If this is the first thing in an expansion string, |
| 4521 | yield will be NULL; just point it at the new store instead of copying. Many |
| 4522 | expansion strings contain just one reference, so this is a useful |
| 4523 | optimization, especially for humungous headers. We need to use a gstring |
| 4524 | structure that is not allocated after that new-buffer, else a later store |
| 4525 | reset in the middle of the buffer will make it inaccessible. */ |
| 4526 | |
| 4527 | len = Ustrlen(value); |
| 4528 | if (!yield && newsize != 0) |
| 4529 | { |
| 4530 | yield = g; |
| 4531 | yield->size = newsize; |
| 4532 | yield->ptr = len; |
| 4533 | yield->s = value; |
| 4534 | } |
| 4535 | else |
| 4536 | yield = string_catn(yield, value, len); |
| 4537 | |
| 4538 | continue; |
| 4539 | } |
| 4540 | |
| 4541 | if (isdigit(*s)) |
| 4542 | { |
| 4543 | int n; |
| 4544 | s = read_cnumber(&n, s); |
| 4545 | if (n >= 0 && n <= expand_nmax) |
| 4546 | yield = string_catn(yield, expand_nstring[n], expand_nlength[n]); |
| 4547 | continue; |
| 4548 | } |
| 4549 | |
| 4550 | /* Otherwise, if there's no '{' after $ it's an error. */ /*}*/ |
| 4551 | |
| 4552 | if (*s != '{') /*}*/ |
| 4553 | { |
| 4554 | expand_string_message = US"$ not followed by letter, digit, or {"; /*}*/ |
| 4555 | goto EXPAND_FAILED; |
| 4556 | } |
| 4557 | |
| 4558 | /* After { there can be various things, but they all start with |
| 4559 | an initial word, except for a number for a string match variable. */ |
| 4560 | |
| 4561 | if (isdigit((*(++s)))) |
| 4562 | { |
| 4563 | int n; |
| 4564 | s = read_cnumber(&n, s); /*{*/ |
| 4565 | if (*s++ != '}') |
| 4566 | { /*{*/ |
| 4567 | expand_string_message = US"} expected after number"; |
| 4568 | goto EXPAND_FAILED; |
| 4569 | } |
| 4570 | if (n >= 0 && n <= expand_nmax) |
| 4571 | yield = string_catn(yield, expand_nstring[n], expand_nlength[n]); |
| 4572 | continue; |
| 4573 | } |
| 4574 | |
| 4575 | if (!isalpha(*s)) |
| 4576 | { |
| 4577 | expand_string_message = US"letter or digit expected after ${"; /*}*/ |
| 4578 | goto EXPAND_FAILED; |
| 4579 | } |
| 4580 | |
| 4581 | /* Allow "-" in names to cater for substrings with negative |
| 4582 | arguments. Since we are checking for known names after { this is |
| 4583 | OK. */ |
| 4584 | |
| 4585 | s = read_name(name, sizeof(name), s, US"_-"); |
| 4586 | item_type = chop_match(name, item_table, nelem(item_table)); |
| 4587 | |
| 4588 | switch(item_type) |
| 4589 | { |
| 4590 | /* Call an ACL from an expansion. We feed data in via $acl_arg1 - $acl_arg9. |
| 4591 | If the ACL returns accept or reject we return content set by "message =" |
| 4592 | There is currently no limit on recursion; this would have us call |
| 4593 | acl_check_internal() directly and get a current level from somewhere. |
| 4594 | See also the acl expansion condition ECOND_ACL and the traditional |
| 4595 | acl modifier ACLC_ACL. |
| 4596 | Assume that the function has side-effects on the store that must be preserved. |
| 4597 | */ |
| 4598 | |
| 4599 | case EITEM_ACL: |
| 4600 | /* ${acl {name} {arg1}{arg2}...} */ |
| 4601 | { |
| 4602 | uschar *sub[10]; /* name + arg1-arg9 (which must match number of acl_arg[]) */ |
| 4603 | uschar *user_msg; |
| 4604 | int rc; |
| 4605 | |
| 4606 | switch(read_subs(sub, nelem(sub), 1, &s, skipping, TRUE, US"acl", |
| 4607 | &resetok)) |
| 4608 | { |
| 4609 | case 1: goto EXPAND_FAILED_CURLY; |
| 4610 | case 2: |
| 4611 | case 3: goto EXPAND_FAILED; |
| 4612 | } |
| 4613 | if (skipping) continue; |
| 4614 | |
| 4615 | resetok = FALSE; |
| 4616 | switch(rc = eval_acl(sub, nelem(sub), &user_msg)) |
| 4617 | { |
| 4618 | case OK: |
| 4619 | case FAIL: |
| 4620 | DEBUG(D_expand) |
| 4621 | debug_printf_indent("acl expansion yield: %s\n", user_msg); |
| 4622 | if (user_msg) |
| 4623 | yield = string_cat(yield, user_msg); |
| 4624 | continue; |
| 4625 | |
| 4626 | case DEFER: |
| 4627 | f.expand_string_forcedfail = TRUE; |
| 4628 | /*FALLTHROUGH*/ |
| 4629 | default: |
| 4630 | expand_string_message = string_sprintf("%s from acl \"%s\"", |
| 4631 | rc_names[rc], sub[0]); |
| 4632 | goto EXPAND_FAILED; |
| 4633 | } |
| 4634 | } |
| 4635 | |
| 4636 | case EITEM_AUTHRESULTS: |
| 4637 | /* ${authresults {mysystemname}} */ |
| 4638 | { |
| 4639 | uschar *sub_arg[1]; |
| 4640 | |
| 4641 | switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name, |
| 4642 | &resetok)) |
| 4643 | { |
| 4644 | case 1: goto EXPAND_FAILED_CURLY; |
| 4645 | case 2: |
| 4646 | case 3: goto EXPAND_FAILED; |
| 4647 | } |
| 4648 | |
| 4649 | yield = string_append(yield, 3, |
| 4650 | US"Authentication-Results: ", sub_arg[0], US"; none"); |
| 4651 | yield->ptr -= 6; |
| 4652 | |
| 4653 | yield = authres_local(yield, sub_arg[0]); |
| 4654 | yield = authres_iprev(yield); |
| 4655 | yield = authres_smtpauth(yield); |
| 4656 | #ifdef SUPPORT_SPF |
| 4657 | yield = authres_spf(yield); |
| 4658 | #endif |
| 4659 | #ifndef DISABLE_DKIM |
| 4660 | yield = authres_dkim(yield); |
| 4661 | #endif |
| 4662 | #ifdef SUPPORT_DMARC |
| 4663 | yield = authres_dmarc(yield); |
| 4664 | #endif |
| 4665 | #ifdef EXPERIMENTAL_ARC |
| 4666 | yield = authres_arc(yield); |
| 4667 | #endif |
| 4668 | continue; |
| 4669 | } |
| 4670 | |
| 4671 | /* Handle conditionals - preserve the values of the numerical expansion |
| 4672 | variables in case they get changed by a regular expression match in the |
| 4673 | condition. If not, they retain their external settings. At the end |
| 4674 | of this "if" section, they get restored to their previous values. */ |
| 4675 | |
| 4676 | case EITEM_IF: |
| 4677 | { |
| 4678 | BOOL cond = FALSE; |
| 4679 | const uschar *next_s; |
| 4680 | int save_expand_nmax = |
| 4681 | save_expand_strings(save_expand_nstring, save_expand_nlength); |
| 4682 | |
| 4683 | while (isspace(*s)) s++; |
| 4684 | if (!(next_s = eval_condition(s, &resetok, skipping ? NULL : &cond))) |
| 4685 | goto EXPAND_FAILED; /* message already set */ |
| 4686 | |
| 4687 | DEBUG(D_expand) |
| 4688 | DEBUG(D_noutf8) |
| 4689 | { |
| 4690 | debug_printf_indent("|--condition: %.*s\n", (int)(next_s - s), s); |
| 4691 | debug_printf_indent("|-----result: %s\n", cond ? "true" : "false"); |
| 4692 | } |
| 4693 | else |
| 4694 | { |
| 4695 | debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ |
| 4696 | "condition: %.*s\n", |
| 4697 | (int)(next_s - s), s); |
| 4698 | debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ |
| 4699 | UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ |
| 4700 | "result: %s\n", |
| 4701 | cond ? "true" : "false"); |
| 4702 | } |
| 4703 | |
| 4704 | s = next_s; |
| 4705 | |
| 4706 | /* The handling of "yes" and "no" result strings is now in a separate |
| 4707 | function that is also used by ${lookup} and ${extract} and ${run}. */ |
| 4708 | |
| 4709 | switch(process_yesno( |
| 4710 | skipping, /* were previously skipping */ |
| 4711 | cond, /* success/failure indicator */ |
| 4712 | lookup_value, /* value to reset for string2 */ |
| 4713 | &s, /* input pointer */ |
| 4714 | &yield, /* output pointer */ |
| 4715 | US"if", /* condition type */ |
| 4716 | &resetok)) |
| 4717 | { |
| 4718 | case 1: goto EXPAND_FAILED; /* when all is well, the */ |
| 4719 | case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ |
| 4720 | } |
| 4721 | |
| 4722 | /* Restore external setting of expansion variables for continuation |
| 4723 | at this level. */ |
| 4724 | |
| 4725 | restore_expand_strings(save_expand_nmax, save_expand_nstring, |
| 4726 | save_expand_nlength); |
| 4727 | continue; |
| 4728 | } |
| 4729 | |
| 4730 | #ifdef SUPPORT_I18N |
| 4731 | case EITEM_IMAPFOLDER: |
| 4732 | { /* ${imapfolder {name}{sep]{specials}} */ |
| 4733 | uschar *sub_arg[3]; |
| 4734 | uschar *encoded; |
| 4735 | |
| 4736 | switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name, |
| 4737 | &resetok)) |
| 4738 | { |
| 4739 | case 1: goto EXPAND_FAILED_CURLY; |
| 4740 | case 2: |
| 4741 | case 3: goto EXPAND_FAILED; |
| 4742 | } |
| 4743 | |
| 4744 | if (!sub_arg[1]) /* One argument */ |
| 4745 | { |
| 4746 | sub_arg[1] = US"/"; /* default separator */ |
| 4747 | sub_arg[2] = NULL; |
| 4748 | } |
| 4749 | else if (Ustrlen(sub_arg[1]) != 1) |
| 4750 | { |
| 4751 | expand_string_message = |
| 4752 | string_sprintf( |
| 4753 | "IMAP folder separator must be one character, found \"%s\"", |
| 4754 | sub_arg[1]); |
| 4755 | goto EXPAND_FAILED; |
| 4756 | } |
| 4757 | |
| 4758 | if (!skipping) |
| 4759 | { |
| 4760 | if (!(encoded = imap_utf7_encode(sub_arg[0], headers_charset, |
| 4761 | sub_arg[1][0], sub_arg[2], &expand_string_message))) |
| 4762 | goto EXPAND_FAILED; |
| 4763 | yield = string_cat(yield, encoded); |
| 4764 | } |
| 4765 | continue; |
| 4766 | } |
| 4767 | #endif |
| 4768 | |
| 4769 | /* Handle database lookups unless locked out. If "skipping" is TRUE, we are |
| 4770 | expanding an internal string that isn't actually going to be used. All we |
| 4771 | need to do is check the syntax, so don't do a lookup at all. Preserve the |
| 4772 | values of the numerical expansion variables in case they get changed by a |
| 4773 | partial lookup. If not, they retain their external settings. At the end |
| 4774 | of this "lookup" section, they get restored to their previous values. */ |
| 4775 | |
| 4776 | case EITEM_LOOKUP: |
| 4777 | { |
| 4778 | int stype, partial, affixlen, starflags; |
| 4779 | int expand_setup = 0; |
| 4780 | int nameptr = 0; |
| 4781 | uschar *key, *filename; |
| 4782 | const uschar *affix; |
| 4783 | uschar *save_lookup_value = lookup_value; |
| 4784 | int save_expand_nmax = |
| 4785 | save_expand_strings(save_expand_nstring, save_expand_nlength); |
| 4786 | |
| 4787 | if ((expand_forbid & RDO_LOOKUP) != 0) |
| 4788 | { |
| 4789 | expand_string_message = US"lookup expansions are not permitted"; |
| 4790 | goto EXPAND_FAILED; |
| 4791 | } |
| 4792 | |
| 4793 | /* Get the key we are to look up for single-key+file style lookups. |
| 4794 | Otherwise set the key NULL pro-tem. */ |
| 4795 | |
| 4796 | while (isspace(*s)) s++; |
| 4797 | if (*s == '{') /*}*/ |
| 4798 | { |
| 4799 | key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok); |
| 4800 | if (!key) goto EXPAND_FAILED; /*{{*/ |
| 4801 | if (*s++ != '}') |
| 4802 | { |
| 4803 | expand_string_message = US"missing '}' after lookup key"; |
| 4804 | goto EXPAND_FAILED_CURLY; |
| 4805 | } |
| 4806 | while (isspace(*s)) s++; |
| 4807 | } |
| 4808 | else key = NULL; |
| 4809 | |
| 4810 | /* Find out the type of database */ |
| 4811 | |
| 4812 | if (!isalpha(*s)) |
| 4813 | { |
| 4814 | expand_string_message = US"missing lookup type"; |
| 4815 | goto EXPAND_FAILED; |
| 4816 | } |
| 4817 | |
| 4818 | /* The type is a string that may contain special characters of various |
| 4819 | kinds. Allow everything except space or { to appear; the actual content |
| 4820 | is checked by search_findtype_partial. */ /*}*/ |
| 4821 | |
| 4822 | while (*s != 0 && *s != '{' && !isspace(*s)) /*}*/ |
| 4823 | { |
| 4824 | if (nameptr < sizeof(name) - 1) name[nameptr++] = *s; |
| 4825 | s++; |
| 4826 | } |
| 4827 | name[nameptr] = 0; |
| 4828 | while (isspace(*s)) s++; |
| 4829 | |
| 4830 | /* Now check for the individual search type and any partial or default |
| 4831 | options. Only those types that are actually in the binary are valid. */ |
| 4832 | |
| 4833 | stype = search_findtype_partial(name, &partial, &affix, &affixlen, |
| 4834 | &starflags); |
| 4835 | if (stype < 0) |
| 4836 | { |
| 4837 | expand_string_message = search_error_message; |
| 4838 | goto EXPAND_FAILED; |
| 4839 | } |
| 4840 | |
| 4841 | /* Check that a key was provided for those lookup types that need it, |
| 4842 | and was not supplied for those that use the query style. */ |
| 4843 | |
| 4844 | if (!mac_islookup(stype, lookup_querystyle|lookup_absfilequery)) |
| 4845 | { |
| 4846 | if (!key) |
| 4847 | { |
| 4848 | expand_string_message = string_sprintf("missing {key} for single-" |
| 4849 | "key \"%s\" lookup", name); |
| 4850 | goto EXPAND_FAILED; |
| 4851 | } |
| 4852 | } |
| 4853 | else |
| 4854 | { |
| 4855 | if (key) |
| 4856 | { |
| 4857 | expand_string_message = string_sprintf("a single key was given for " |
| 4858 | "lookup type \"%s\", which is not a single-key lookup type", name); |
| 4859 | goto EXPAND_FAILED; |
| 4860 | } |
| 4861 | } |
| 4862 | |
| 4863 | /* Get the next string in brackets and expand it. It is the file name for |
| 4864 | single-key+file lookups, and the whole query otherwise. In the case of |
| 4865 | queries that also require a file name (e.g. sqlite), the file name comes |
| 4866 | first. */ |
| 4867 | |
| 4868 | if (*s != '{') |
| 4869 | { |
| 4870 | expand_string_message = US"missing '{' for lookup file-or-query arg"; |
| 4871 | goto EXPAND_FAILED_CURLY; |
| 4872 | } |
| 4873 | if (!(filename = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok))) |
| 4874 | goto EXPAND_FAILED; |
| 4875 | if (*s++ != '}') |
| 4876 | { |
| 4877 | expand_string_message = US"missing '}' closing lookup file-or-query arg"; |
| 4878 | goto EXPAND_FAILED_CURLY; |
| 4879 | } |
| 4880 | while (isspace(*s)) s++; |
| 4881 | |
| 4882 | /* If this isn't a single-key+file lookup, re-arrange the variables |
| 4883 | to be appropriate for the search_ functions. For query-style lookups, |
| 4884 | there is just a "key", and no file name. For the special query-style + |
| 4885 | file types, the query (i.e. "key") starts with a file name. */ |
| 4886 | |
| 4887 | if (!key) |
| 4888 | { |
| 4889 | while (isspace(*filename)) filename++; |
| 4890 | key = filename; |
| 4891 | |
| 4892 | if (mac_islookup(stype, lookup_querystyle)) |
| 4893 | filename = NULL; |
| 4894 | else |
| 4895 | if (*filename == '/') |
| 4896 | { |
| 4897 | while (*key && !isspace(*key)) key++; |
| 4898 | if (*key) *key++ = '\0'; |
| 4899 | } |
| 4900 | else |
| 4901 | filename = NULL; |
| 4902 | } |
| 4903 | |
| 4904 | /* If skipping, don't do the next bit - just lookup_value == NULL, as if |
| 4905 | the entry was not found. Note that there is no search_close() function. |
| 4906 | Files are left open in case of re-use. At suitable places in higher logic, |
| 4907 | search_tidyup() is called to tidy all open files. This can save opening |
| 4908 | the same file several times. However, files may also get closed when |
| 4909 | others are opened, if too many are open at once. The rule is that a |
| 4910 | handle should not be used after a second search_open(). |
| 4911 | |
| 4912 | Request that a partial search sets up $1 and maybe $2 by passing |
| 4913 | expand_setup containing zero. If its value changes, reset expand_nmax, |
| 4914 | since new variables will have been set. Note that at the end of this |
| 4915 | "lookup" section, the old numeric variables are restored. */ |
| 4916 | |
| 4917 | if (skipping) |
| 4918 | lookup_value = NULL; |
| 4919 | else |
| 4920 | { |
| 4921 | void *handle = search_open(filename, stype, 0, NULL, NULL); |
| 4922 | if (!handle) |
| 4923 | { |
| 4924 | expand_string_message = search_error_message; |
| 4925 | goto EXPAND_FAILED; |
| 4926 | } |
| 4927 | lookup_value = search_find(handle, filename, key, partial, affix, |
| 4928 | affixlen, starflags, &expand_setup); |
| 4929 | if (f.search_find_defer) |
| 4930 | { |
| 4931 | expand_string_message = |
| 4932 | string_sprintf("lookup of \"%s\" gave DEFER: %s", |
| 4933 | string_printing2(key, FALSE), search_error_message); |
| 4934 | goto EXPAND_FAILED; |
| 4935 | } |
| 4936 | if (expand_setup > 0) expand_nmax = expand_setup; |
| 4937 | } |
| 4938 | |
| 4939 | /* The handling of "yes" and "no" result strings is now in a separate |
| 4940 | function that is also used by ${if} and ${extract}. */ |
| 4941 | |
| 4942 | switch(process_yesno( |
| 4943 | skipping, /* were previously skipping */ |
| 4944 | lookup_value != NULL, /* success/failure indicator */ |
| 4945 | save_lookup_value, /* value to reset for string2 */ |
| 4946 | &s, /* input pointer */ |
| 4947 | &yield, /* output pointer */ |
| 4948 | US"lookup", /* condition type */ |
| 4949 | &resetok)) |
| 4950 | { |
| 4951 | case 1: goto EXPAND_FAILED; /* when all is well, the */ |
| 4952 | case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ |
| 4953 | } |
| 4954 | |
| 4955 | /* Restore external setting of expansion variables for carrying on |
| 4956 | at this level, and continue. */ |
| 4957 | |
| 4958 | restore_expand_strings(save_expand_nmax, save_expand_nstring, |
| 4959 | save_expand_nlength); |
| 4960 | continue; |
| 4961 | } |
| 4962 | |
| 4963 | /* If Perl support is configured, handle calling embedded perl subroutines, |
| 4964 | unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}} |
| 4965 | or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS |
| 4966 | arguments (defined below). */ |
| 4967 | |
| 4968 | #define EXIM_PERL_MAX_ARGS 8 |
| 4969 | |
| 4970 | case EITEM_PERL: |
| 4971 | #ifndef EXIM_PERL |
| 4972 | expand_string_message = US"\"${perl\" encountered, but this facility " /*}*/ |
| 4973 | "is not included in this binary"; |
| 4974 | goto EXPAND_FAILED; |
| 4975 | |
| 4976 | #else /* EXIM_PERL */ |
| 4977 | { |
| 4978 | uschar *sub_arg[EXIM_PERL_MAX_ARGS + 2]; |
| 4979 | gstring *new_yield; |
| 4980 | |
| 4981 | if ((expand_forbid & RDO_PERL) != 0) |
| 4982 | { |
| 4983 | expand_string_message = US"Perl calls are not permitted"; |
| 4984 | goto EXPAND_FAILED; |
| 4985 | } |
| 4986 | |
| 4987 | switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, skipping, TRUE, |
| 4988 | US"perl", &resetok)) |
| 4989 | { |
| 4990 | case 1: goto EXPAND_FAILED_CURLY; |
| 4991 | case 2: |
| 4992 | case 3: goto EXPAND_FAILED; |
| 4993 | } |
| 4994 | |
| 4995 | /* If skipping, we don't actually do anything */ |
| 4996 | |
| 4997 | if (skipping) continue; |
| 4998 | |
| 4999 | /* Start the interpreter if necessary */ |
| 5000 | |
| 5001 | if (!opt_perl_started) |
| 5002 | { |
| 5003 | uschar *initerror; |
| 5004 | if (!opt_perl_startup) |
| 5005 | { |
| 5006 | expand_string_message = US"A setting of perl_startup is needed when " |
| 5007 | "using the Perl interpreter"; |
| 5008 | goto EXPAND_FAILED; |
| 5009 | } |
| 5010 | DEBUG(D_any) debug_printf("Starting Perl interpreter\n"); |
| 5011 | if ((initerror = init_perl(opt_perl_startup))) |
| 5012 | { |
| 5013 | expand_string_message = |
| 5014 | string_sprintf("error in perl_startup code: %s\n", initerror); |
| 5015 | goto EXPAND_FAILED; |
| 5016 | } |
| 5017 | opt_perl_started = TRUE; |
| 5018 | } |
| 5019 | |
| 5020 | /* Call the function */ |
| 5021 | |
| 5022 | sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL; |
| 5023 | new_yield = call_perl_cat(yield, &expand_string_message, |
| 5024 | sub_arg[0], sub_arg + 1); |
| 5025 | |
| 5026 | /* NULL yield indicates failure; if the message pointer has been set to |
| 5027 | NULL, the yield was undef, indicating a forced failure. Otherwise the |
| 5028 | message will indicate some kind of Perl error. */ |
| 5029 | |
| 5030 | if (!new_yield) |
| 5031 | { |
| 5032 | if (!expand_string_message) |
| 5033 | { |
| 5034 | expand_string_message = |
| 5035 | string_sprintf("Perl subroutine \"%s\" returned undef to force " |
| 5036 | "failure", sub_arg[0]); |
| 5037 | f.expand_string_forcedfail = TRUE; |
| 5038 | } |
| 5039 | goto EXPAND_FAILED; |
| 5040 | } |
| 5041 | |
| 5042 | /* Yield succeeded. Ensure forcedfail is unset, just in case it got |
| 5043 | set during a callback from Perl. */ |
| 5044 | |
| 5045 | f.expand_string_forcedfail = FALSE; |
| 5046 | yield = new_yield; |
| 5047 | continue; |
| 5048 | } |
| 5049 | #endif /* EXIM_PERL */ |
| 5050 | |
| 5051 | /* Transform email address to "prvs" scheme to use |
| 5052 | as BATV-signed return path */ |
| 5053 | |
| 5054 | case EITEM_PRVS: |
| 5055 | { |
| 5056 | uschar *sub_arg[3]; |
| 5057 | uschar *p,*domain; |
| 5058 | |
| 5059 | switch(read_subs(sub_arg, 3, 2, &s, skipping, TRUE, US"prvs", &resetok)) |
| 5060 | { |
| 5061 | case 1: goto EXPAND_FAILED_CURLY; |
| 5062 | case 2: |
| 5063 | case 3: goto EXPAND_FAILED; |
| 5064 | } |
| 5065 | |
| 5066 | /* If skipping, we don't actually do anything */ |
| 5067 | if (skipping) continue; |
| 5068 | |
| 5069 | /* sub_arg[0] is the address */ |
| 5070 | if ( !(domain = Ustrrchr(sub_arg[0],'@')) |
| 5071 | || domain == sub_arg[0] || Ustrlen(domain) == 1) |
| 5072 | { |
| 5073 | expand_string_message = US"prvs first argument must be a qualified email address"; |
| 5074 | goto EXPAND_FAILED; |
| 5075 | } |
| 5076 | |
| 5077 | /* Calculate the hash. The third argument must be a single-digit |
| 5078 | key number, or unset. */ |
| 5079 | |
| 5080 | if ( sub_arg[2] |
| 5081 | && (!isdigit(sub_arg[2][0]) || sub_arg[2][1] != 0)) |
| 5082 | { |
| 5083 | expand_string_message = US"prvs third argument must be a single digit"; |
| 5084 | goto EXPAND_FAILED; |
| 5085 | } |
| 5086 | |
| 5087 | p = prvs_hmac_sha1(sub_arg[0], sub_arg[1], sub_arg[2], prvs_daystamp(7)); |
| 5088 | if (!p) |
| 5089 | { |
| 5090 | expand_string_message = US"prvs hmac-sha1 conversion failed"; |
| 5091 | goto EXPAND_FAILED; |
| 5092 | } |
| 5093 | |
| 5094 | /* Now separate the domain from the local part */ |
| 5095 | *domain++ = '\0'; |
| 5096 | |
| 5097 | yield = string_catn(yield, US"prvs=", 5); |
| 5098 | yield = string_catn(yield, sub_arg[2] ? sub_arg[2] : US"0", 1); |
| 5099 | yield = string_catn(yield, prvs_daystamp(7), 3); |
| 5100 | yield = string_catn(yield, p, 6); |
| 5101 | yield = string_catn(yield, US"=", 1); |
| 5102 | yield = string_cat (yield, sub_arg[0]); |
| 5103 | yield = string_catn(yield, US"@", 1); |
| 5104 | yield = string_cat (yield, domain); |
| 5105 | |
| 5106 | continue; |
| 5107 | } |
| 5108 | |
| 5109 | /* Check a prvs-encoded address for validity */ |
| 5110 | |
| 5111 | case EITEM_PRVSCHECK: |
| 5112 | { |
| 5113 | uschar *sub_arg[3]; |
| 5114 | gstring * g; |
| 5115 | const pcre *re; |
| 5116 | uschar *p; |
| 5117 | |
| 5118 | /* TF: Ugliness: We want to expand parameter 1 first, then set |
| 5119 | up expansion variables that are used in the expansion of |
| 5120 | parameter 2. So we clone the string for the first |
| 5121 | expansion, where we only expand parameter 1. |
| 5122 | |
| 5123 | PH: Actually, that isn't necessary. The read_subs() function is |
| 5124 | designed to work this way for the ${if and ${lookup expansions. I've |
| 5125 | tidied the code. |
| 5126 | */ |
| 5127 | |
| 5128 | /* Reset expansion variables */ |
| 5129 | prvscheck_result = NULL; |
| 5130 | prvscheck_address = NULL; |
| 5131 | prvscheck_keynum = NULL; |
| 5132 | |
| 5133 | switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, US"prvs", &resetok)) |
| 5134 | { |
| 5135 | case 1: goto EXPAND_FAILED_CURLY; |
| 5136 | case 2: |
| 5137 | case 3: goto EXPAND_FAILED; |
| 5138 | } |
| 5139 | |
| 5140 | re = regex_must_compile(US"^prvs\\=([0-9])([0-9]{3})([A-F0-9]{6})\\=(.+)\\@(.+)$", |
| 5141 | TRUE,FALSE); |
| 5142 | |
| 5143 | if (regex_match_and_setup(re,sub_arg[0],0,-1)) |
| 5144 | { |
| 5145 | uschar *local_part = string_copyn(expand_nstring[4],expand_nlength[4]); |
| 5146 | uschar *key_num = string_copyn(expand_nstring[1],expand_nlength[1]); |
| 5147 | uschar *daystamp = string_copyn(expand_nstring[2],expand_nlength[2]); |
| 5148 | uschar *hash = string_copyn(expand_nstring[3],expand_nlength[3]); |
| 5149 | uschar *domain = string_copyn(expand_nstring[5],expand_nlength[5]); |
| 5150 | |
| 5151 | DEBUG(D_expand) debug_printf_indent("prvscheck localpart: %s\n", local_part); |
| 5152 | DEBUG(D_expand) debug_printf_indent("prvscheck key number: %s\n", key_num); |
| 5153 | DEBUG(D_expand) debug_printf_indent("prvscheck daystamp: %s\n", daystamp); |
| 5154 | DEBUG(D_expand) debug_printf_indent("prvscheck hash: %s\n", hash); |
| 5155 | DEBUG(D_expand) debug_printf_indent("prvscheck domain: %s\n", domain); |
| 5156 | |
| 5157 | /* Set up expansion variables */ |
| 5158 | g = string_cat (NULL, local_part); |
| 5159 | g = string_catn(g, US"@", 1); |
| 5160 | g = string_cat (g, domain); |
| 5161 | prvscheck_address = string_from_gstring(g); |
| 5162 | prvscheck_keynum = string_copy(key_num); |
| 5163 | |
| 5164 | /* Now expand the second argument */ |
| 5165 | switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, US"prvs", &resetok)) |
| 5166 | { |
| 5167 | case 1: goto EXPAND_FAILED_CURLY; |
| 5168 | case 2: |
| 5169 | case 3: goto EXPAND_FAILED; |
| 5170 | } |
| 5171 | |
| 5172 | /* Now we have the key and can check the address. */ |
| 5173 | |
| 5174 | p = prvs_hmac_sha1(prvscheck_address, sub_arg[0], prvscheck_keynum, |
| 5175 | daystamp); |
| 5176 | |
| 5177 | if (!p) |
| 5178 | { |
| 5179 | expand_string_message = US"hmac-sha1 conversion failed"; |
| 5180 | goto EXPAND_FAILED; |
| 5181 | } |
| 5182 | |
| 5183 | DEBUG(D_expand) debug_printf_indent("prvscheck: received hash is %s\n", hash); |
| 5184 | DEBUG(D_expand) debug_printf_indent("prvscheck: own hash is %s\n", p); |
| 5185 | |
| 5186 | if (Ustrcmp(p,hash) == 0) |
| 5187 | { |
| 5188 | /* Success, valid BATV address. Now check the expiry date. */ |
| 5189 | uschar *now = prvs_daystamp(0); |
| 5190 | unsigned int inow = 0,iexpire = 1; |
| 5191 | |
| 5192 | (void)sscanf(CS now,"%u",&inow); |
| 5193 | (void)sscanf(CS daystamp,"%u",&iexpire); |
| 5194 | |
| 5195 | /* When "iexpire" is < 7, a "flip" has occurred. |
| 5196 | Adjust "inow" accordingly. */ |
| 5197 | if ( (iexpire < 7) && (inow >= 993) ) inow = 0; |
| 5198 | |
| 5199 | if (iexpire >= inow) |
| 5200 | { |
| 5201 | prvscheck_result = US"1"; |
| 5202 | DEBUG(D_expand) debug_printf_indent("prvscheck: success, $pvrs_result set to 1\n"); |
| 5203 | } |
| 5204 | else |
| 5205 | { |
| 5206 | prvscheck_result = NULL; |
| 5207 | DEBUG(D_expand) debug_printf_indent("prvscheck: signature expired, $pvrs_result unset\n"); |
| 5208 | } |
| 5209 | } |
| 5210 | else |
| 5211 | { |
| 5212 | prvscheck_result = NULL; |
| 5213 | DEBUG(D_expand) debug_printf_indent("prvscheck: hash failure, $pvrs_result unset\n"); |
| 5214 | } |
| 5215 | |
| 5216 | /* Now expand the final argument. We leave this till now so that |
| 5217 | it can include $prvscheck_result. */ |
| 5218 | |
| 5219 | switch(read_subs(sub_arg, 1, 0, &s, skipping, TRUE, US"prvs", &resetok)) |
| 5220 | { |
| 5221 | case 1: goto EXPAND_FAILED_CURLY; |
| 5222 | case 2: |
| 5223 | case 3: goto EXPAND_FAILED; |
| 5224 | } |
| 5225 | |
| 5226 | yield = string_cat(yield, |
| 5227 | !sub_arg[0] || !*sub_arg[0] ? prvscheck_address : sub_arg[0]); |
| 5228 | |
| 5229 | /* Reset the "internal" variables afterwards, because they are in |
| 5230 | dynamic store that will be reclaimed if the expansion succeeded. */ |
| 5231 | |
| 5232 | prvscheck_address = NULL; |
| 5233 | prvscheck_keynum = NULL; |
| 5234 | } |
| 5235 | else |
| 5236 | /* Does not look like a prvs encoded address, return the empty string. |
| 5237 | We need to make sure all subs are expanded first, so as to skip over |
| 5238 | the entire item. */ |
| 5239 | |
| 5240 | switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, US"prvs", &resetok)) |
| 5241 | { |
| 5242 | case 1: goto EXPAND_FAILED_CURLY; |
| 5243 | case 2: |
| 5244 | case 3: goto EXPAND_FAILED; |
| 5245 | } |
| 5246 | |
| 5247 | continue; |
| 5248 | } |
| 5249 | |
| 5250 | /* Handle "readfile" to insert an entire file */ |
| 5251 | |
| 5252 | case EITEM_READFILE: |
| 5253 | { |
| 5254 | FILE *f; |
| 5255 | uschar *sub_arg[2]; |
| 5256 | |
| 5257 | if ((expand_forbid & RDO_READFILE) != 0) |
| 5258 | { |
| 5259 | expand_string_message = US"file insertions are not permitted"; |
| 5260 | goto EXPAND_FAILED; |
| 5261 | } |
| 5262 | |
| 5263 | switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, US"readfile", &resetok)) |
| 5264 | { |
| 5265 | case 1: goto EXPAND_FAILED_CURLY; |
| 5266 | case 2: |
| 5267 | case 3: goto EXPAND_FAILED; |
| 5268 | } |
| 5269 | |
| 5270 | /* If skipping, we don't actually do anything */ |
| 5271 | |
| 5272 | if (skipping) continue; |
| 5273 | |
| 5274 | /* Open the file and read it */ |
| 5275 | |
| 5276 | if (!(f = Ufopen(sub_arg[0], "rb"))) |
| 5277 | { |
| 5278 | expand_string_message = string_open_failed(errno, "%s", sub_arg[0]); |
| 5279 | goto EXPAND_FAILED; |
| 5280 | } |
| 5281 | |
| 5282 | yield = cat_file(f, yield, sub_arg[1]); |
| 5283 | (void)fclose(f); |
| 5284 | continue; |
| 5285 | } |
| 5286 | |
| 5287 | /* Handle "readsocket" to insert data from a socket, either |
| 5288 | Inet or Unix domain */ |
| 5289 | |
| 5290 | case EITEM_READSOCK: |
| 5291 | { |
| 5292 | client_conn_ctx cctx; |
| 5293 | int timeout = 5; |
| 5294 | int save_ptr = gstring_length(yield); |
| 5295 | FILE * fp = NULL; |
| 5296 | uschar * arg; |
| 5297 | uschar * sub_arg[4]; |
| 5298 | uschar * server_name = NULL; |
| 5299 | host_item host; |
| 5300 | BOOL do_shutdown = TRUE; |
| 5301 | BOOL do_tls = FALSE; /* Only set under ! DISABLE_TLS */ |
| 5302 | blob reqstr; |
| 5303 | |
| 5304 | if (expand_forbid & RDO_READSOCK) |
| 5305 | { |
| 5306 | expand_string_message = US"socket insertions are not permitted"; |
| 5307 | goto EXPAND_FAILED; |
| 5308 | } |
| 5309 | |
| 5310 | /* Read up to 4 arguments, but don't do the end of item check afterwards, |
| 5311 | because there may be a string for expansion on failure. */ |
| 5312 | |
| 5313 | switch(read_subs(sub_arg, 4, 2, &s, skipping, FALSE, US"readsocket", &resetok)) |
| 5314 | { |
| 5315 | case 1: goto EXPAND_FAILED_CURLY; |
| 5316 | case 2: /* Won't occur: no end check */ |
| 5317 | case 3: goto EXPAND_FAILED; |
| 5318 | } |
| 5319 | |
| 5320 | /* Grab the request string, if any */ |
| 5321 | |
| 5322 | reqstr.data = sub_arg[1]; |
| 5323 | reqstr.len = Ustrlen(sub_arg[1]); |
| 5324 | |
| 5325 | /* Sort out timeout, if given. The second arg is a list with the first element |
| 5326 | being a time value. Any more are options of form "name=value". Currently the |
| 5327 | only option recognised is "shutdown". */ |
| 5328 | |
| 5329 | if (sub_arg[2]) |
| 5330 | { |
| 5331 | const uschar * list = sub_arg[2]; |
| 5332 | uschar * item; |
| 5333 | int sep = 0; |
| 5334 | |
| 5335 | if ( !(item = string_nextinlist(&list, &sep, NULL, 0)) |
| 5336 | || !*item |
| 5337 | || (timeout = readconf_readtime(item, 0, FALSE)) < 0) |
| 5338 | { |
| 5339 | expand_string_message = string_sprintf("bad time value %s", item); |
| 5340 | goto EXPAND_FAILED; |
| 5341 | } |
| 5342 | |
| 5343 | while ((item = string_nextinlist(&list, &sep, NULL, 0))) |
| 5344 | if (Ustrncmp(item, US"shutdown=", 9) == 0) |
| 5345 | { if (Ustrcmp(item + 9, US"no") == 0) do_shutdown = FALSE; } |
| 5346 | #ifndef DISABLE_TLS |
| 5347 | else if (Ustrncmp(item, US"tls=", 4) == 0) |
| 5348 | { if (Ustrcmp(item + 9, US"no") != 0) do_tls = TRUE; } |
| 5349 | #endif |
| 5350 | } |
| 5351 | else |
| 5352 | sub_arg[3] = NULL; /* No eol if no timeout */ |
| 5353 | |
| 5354 | /* If skipping, we don't actually do anything. Otherwise, arrange to |
| 5355 | connect to either an IP or a Unix socket. */ |
| 5356 | |
| 5357 | if (!skipping) |
| 5358 | { |
| 5359 | /* Handle an IP (internet) domain */ |
| 5360 | |
| 5361 | if (Ustrncmp(sub_arg[0], "inet:", 5) == 0) |
| 5362 | { |
| 5363 | int port; |
| 5364 | uschar * port_name; |
| 5365 | |
| 5366 | server_name = sub_arg[0] + 5; |
| 5367 | port_name = Ustrrchr(server_name, ':'); |
| 5368 | |
| 5369 | /* Sort out the port */ |
| 5370 | |
| 5371 | if (!port_name) |
| 5372 | { |
| 5373 | expand_string_message = |
| 5374 | string_sprintf("missing port for readsocket %s", sub_arg[0]); |
| 5375 | goto EXPAND_FAILED; |
| 5376 | } |
| 5377 | *port_name++ = 0; /* Terminate server name */ |
| 5378 | |
| 5379 | if (isdigit(*port_name)) |
| 5380 | { |
| 5381 | uschar *end; |
| 5382 | port = Ustrtol(port_name, &end, 0); |
| 5383 | if (end != port_name + Ustrlen(port_name)) |
| 5384 | { |
| 5385 | expand_string_message = |
| 5386 | string_sprintf("invalid port number %s", port_name); |
| 5387 | goto EXPAND_FAILED; |
| 5388 | } |
| 5389 | } |
| 5390 | else |
| 5391 | { |
| 5392 | struct servent *service_info = getservbyname(CS port_name, "tcp"); |
| 5393 | if (!service_info) |
| 5394 | { |
| 5395 | expand_string_message = string_sprintf("unknown port \"%s\"", |
| 5396 | port_name); |
| 5397 | goto EXPAND_FAILED; |
| 5398 | } |
| 5399 | port = ntohs(service_info->s_port); |
| 5400 | } |
| 5401 | |
| 5402 | /*XXX we trust that the request is idempotent for TFO. Hmm. */ |
| 5403 | cctx.sock = ip_connectedsocket(SOCK_STREAM, server_name, port, port, |
| 5404 | timeout, &host, &expand_string_message, |
| 5405 | do_tls ? NULL : &reqstr); |
| 5406 | callout_address = NULL; |
| 5407 | if (cctx.sock < 0) |
| 5408 | goto SOCK_FAIL; |
| 5409 | if (!do_tls) |
| 5410 | reqstr.len = 0; |
| 5411 | } |
| 5412 | |
| 5413 | /* Handle a Unix domain socket */ |
| 5414 | |
| 5415 | else |
| 5416 | { |
| 5417 | struct sockaddr_un sockun; /* don't call this "sun" ! */ |
| 5418 | int rc; |
| 5419 | |
| 5420 | if ((cctx.sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) |
| 5421 | { |
| 5422 | expand_string_message = string_sprintf("failed to create socket: %s", |
| 5423 | strerror(errno)); |
| 5424 | goto SOCK_FAIL; |
| 5425 | } |
| 5426 | |
| 5427 | sockun.sun_family = AF_UNIX; |
| 5428 | sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1), |
| 5429 | sub_arg[0]); |
| 5430 | server_name = US sockun.sun_path; |
| 5431 | |
| 5432 | sigalrm_seen = FALSE; |
| 5433 | ALARM(timeout); |
| 5434 | rc = connect(cctx.sock, (struct sockaddr *)(&sockun), sizeof(sockun)); |
| 5435 | ALARM_CLR(0); |
| 5436 | if (sigalrm_seen) |
| 5437 | { |
| 5438 | expand_string_message = US "socket connect timed out"; |
| 5439 | goto SOCK_FAIL; |
| 5440 | } |
| 5441 | if (rc < 0) |
| 5442 | { |
| 5443 | expand_string_message = string_sprintf("failed to connect to socket " |
| 5444 | "%s: %s", sub_arg[0], strerror(errno)); |
| 5445 | goto SOCK_FAIL; |
| 5446 | } |
| 5447 | host.name = server_name; |
| 5448 | host.address = US""; |
| 5449 | } |
| 5450 | |
| 5451 | DEBUG(D_expand) debug_printf_indent("connected to socket %s\n", sub_arg[0]); |
| 5452 | |
| 5453 | #ifndef DISABLE_TLS |
| 5454 | if (do_tls) |
| 5455 | { |
| 5456 | smtp_connect_args conn_args = {.host = &host }; |
| 5457 | tls_support tls_dummy = {.sni=NULL}; |
| 5458 | uschar * errstr; |
| 5459 | |
| 5460 | if (!tls_client_start(&cctx, &conn_args, NULL, &tls_dummy, &errstr)) |
| 5461 | { |
| 5462 | expand_string_message = string_sprintf("TLS connect failed: %s", errstr); |
| 5463 | goto SOCK_FAIL; |
| 5464 | } |
| 5465 | } |
| 5466 | #endif |
| 5467 | |
| 5468 | /* Allow sequencing of test actions */ |
| 5469 | testharness_pause_ms(100); |
| 5470 | |
| 5471 | /* Write the request string, if not empty or already done */ |
| 5472 | |
| 5473 | if (reqstr.len) |
| 5474 | { |
| 5475 | DEBUG(D_expand) debug_printf_indent("writing \"%s\" to socket\n", |
| 5476 | reqstr.data); |
| 5477 | if ( ( |
| 5478 | #ifndef DISABLE_TLS |
| 5479 | do_tls ? tls_write(cctx.tls_ctx, reqstr.data, reqstr.len, FALSE) : |
| 5480 | #endif |
| 5481 | write(cctx.sock, reqstr.data, reqstr.len)) != reqstr.len) |
| 5482 | { |
| 5483 | expand_string_message = string_sprintf("request write to socket " |
| 5484 | "failed: %s", strerror(errno)); |
| 5485 | goto SOCK_FAIL; |
| 5486 | } |
| 5487 | } |
| 5488 | |
| 5489 | /* Shut down the sending side of the socket. This helps some servers to |
| 5490 | recognise that it is their turn to do some work. Just in case some |
| 5491 | system doesn't have this function, make it conditional. */ |
| 5492 | |
| 5493 | #ifdef SHUT_WR |
| 5494 | if (!do_tls && do_shutdown) shutdown(cctx.sock, SHUT_WR); |
| 5495 | #endif |
| 5496 | |
| 5497 | testharness_pause_ms(100); |
| 5498 | |
| 5499 | /* Now we need to read from the socket, under a timeout. The function |
| 5500 | that reads a file can be used. */ |
| 5501 | |
| 5502 | if (!do_tls) |
| 5503 | fp = fdopen(cctx.sock, "rb"); |
| 5504 | sigalrm_seen = FALSE; |
| 5505 | ALARM(timeout); |
| 5506 | yield = |
| 5507 | #ifndef DISABLE_TLS |
| 5508 | do_tls ? cat_file_tls(cctx.tls_ctx, yield, sub_arg[3]) : |
| 5509 | #endif |
| 5510 | cat_file(fp, yield, sub_arg[3]); |
| 5511 | ALARM_CLR(0); |
| 5512 | |
| 5513 | #ifndef DISABLE_TLS |
| 5514 | if (do_tls) |
| 5515 | { |
| 5516 | tls_close(cctx.tls_ctx, TRUE); |
| 5517 | close(cctx.sock); |
| 5518 | } |
| 5519 | else |
| 5520 | #endif |
| 5521 | (void)fclose(fp); |
| 5522 | |
| 5523 | /* After a timeout, we restore the pointer in the result, that is, |
| 5524 | make sure we add nothing from the socket. */ |
| 5525 | |
| 5526 | if (sigalrm_seen) |
| 5527 | { |
| 5528 | if (yield) yield->ptr = save_ptr; |
| 5529 | expand_string_message = US "socket read timed out"; |
| 5530 | goto SOCK_FAIL; |
| 5531 | } |
| 5532 | } |
| 5533 | |
| 5534 | /* The whole thing has worked (or we were skipping). If there is a |
| 5535 | failure string following, we need to skip it. */ |
| 5536 | |
| 5537 | if (*s == '{') |
| 5538 | { |
| 5539 | if (!expand_string_internal(s+1, TRUE, &s, TRUE, TRUE, &resetok)) |
| 5540 | goto EXPAND_FAILED; |
| 5541 | if (*s++ != '}') |
| 5542 | { |
| 5543 | expand_string_message = US"missing '}' closing failstring for readsocket"; |
| 5544 | goto EXPAND_FAILED_CURLY; |
| 5545 | } |
| 5546 | while (isspace(*s)) s++; |
| 5547 | } |
| 5548 | |
| 5549 | READSOCK_DONE: |
| 5550 | if (*s++ != '}') |
| 5551 | { |
| 5552 | expand_string_message = US"missing '}' closing readsocket"; |
| 5553 | goto EXPAND_FAILED_CURLY; |
| 5554 | } |
| 5555 | continue; |
| 5556 | |
| 5557 | /* Come here on failure to create socket, connect socket, write to the |
| 5558 | socket, or timeout on reading. If another substring follows, expand and |
| 5559 | use it. Otherwise, those conditions give expand errors. */ |
| 5560 | |
| 5561 | SOCK_FAIL: |
| 5562 | if (*s != '{') goto EXPAND_FAILED; |
| 5563 | DEBUG(D_any) debug_printf("%s\n", expand_string_message); |
| 5564 | if (!(arg = expand_string_internal(s+1, TRUE, &s, FALSE, TRUE, &resetok))) |
| 5565 | goto EXPAND_FAILED; |
| 5566 | yield = string_cat(yield, arg); |
| 5567 | if (*s++ != '}') |
| 5568 | { |
| 5569 | expand_string_message = US"missing '}' closing failstring for readsocket"; |
| 5570 | goto EXPAND_FAILED_CURLY; |
| 5571 | } |
| 5572 | while (isspace(*s)) s++; |
| 5573 | goto READSOCK_DONE; |
| 5574 | } |
| 5575 | |
| 5576 | /* Handle "run" to execute a program. */ |
| 5577 | |
| 5578 | case EITEM_RUN: |
| 5579 | { |
| 5580 | FILE *f; |
| 5581 | uschar *arg; |
| 5582 | const uschar **argv; |
| 5583 | pid_t pid; |
| 5584 | int fd_in, fd_out; |
| 5585 | |
| 5586 | if ((expand_forbid & RDO_RUN) != 0) |
| 5587 | { |
| 5588 | expand_string_message = US"running a command is not permitted"; |
| 5589 | goto EXPAND_FAILED; |
| 5590 | } |
| 5591 | |
| 5592 | while (isspace(*s)) s++; |
| 5593 | if (*s != '{') |
| 5594 | { |
| 5595 | expand_string_message = US"missing '{' for command arg of run"; |
| 5596 | goto EXPAND_FAILED_CURLY; |
| 5597 | } |
| 5598 | if (!(arg = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok))) |
| 5599 | goto EXPAND_FAILED; |
| 5600 | while (isspace(*s)) s++; |
| 5601 | if (*s++ != '}') |
| 5602 | { |
| 5603 | expand_string_message = US"missing '}' closing command arg of run"; |
| 5604 | goto EXPAND_FAILED_CURLY; |
| 5605 | } |
| 5606 | |
| 5607 | if (skipping) /* Just pretend it worked when we're skipping */ |
| 5608 | { |
| 5609 | runrc = 0; |
| 5610 | lookup_value = NULL; |
| 5611 | } |
| 5612 | else |
| 5613 | { |
| 5614 | if (!transport_set_up_command(&argv, /* anchor for arg list */ |
| 5615 | arg, /* raw command */ |
| 5616 | FALSE, /* don't expand the arguments */ |
| 5617 | 0, /* not relevant when... */ |
| 5618 | NULL, /* no transporting address */ |
| 5619 | US"${run} expansion", /* for error messages */ |
| 5620 | &expand_string_message)) /* where to put error message */ |
| 5621 | goto EXPAND_FAILED; |
| 5622 | |
| 5623 | /* Create the child process, making it a group leader. */ |
| 5624 | |
| 5625 | if ((pid = child_open(USS argv, NULL, 0077, &fd_in, &fd_out, TRUE, |
| 5626 | US"expand-run")) < 0) |
| 5627 | { |
| 5628 | expand_string_message = |
| 5629 | string_sprintf("couldn't create child process: %s", strerror(errno)); |
| 5630 | goto EXPAND_FAILED; |
| 5631 | } |
| 5632 | |
| 5633 | /* Nothing is written to the standard input. */ |
| 5634 | |
| 5635 | (void)close(fd_in); |
| 5636 | |
| 5637 | /* Read the pipe to get the command's output into $value (which is kept |
| 5638 | in lookup_value). Read during execution, so that if the output exceeds |
| 5639 | the OS pipe buffer limit, we don't block forever. Remember to not release |
| 5640 | memory just allocated for $value. */ |
| 5641 | |
| 5642 | resetok = FALSE; |
| 5643 | f = fdopen(fd_out, "rb"); |
| 5644 | sigalrm_seen = FALSE; |
| 5645 | ALARM(60); |
| 5646 | lookup_value = string_from_gstring(cat_file(f, NULL, NULL)); |
| 5647 | ALARM_CLR(0); |
| 5648 | (void)fclose(f); |
| 5649 | |
| 5650 | /* Wait for the process to finish, applying the timeout, and inspect its |
| 5651 | return code for serious disasters. Simple non-zero returns are passed on. |
| 5652 | */ |
| 5653 | |
| 5654 | if (sigalrm_seen || (runrc = child_close(pid, 30)) < 0) |
| 5655 | { |
| 5656 | if (sigalrm_seen || runrc == -256) |
| 5657 | { |
| 5658 | expand_string_message = US"command timed out"; |
| 5659 | killpg(pid, SIGKILL); /* Kill the whole process group */ |
| 5660 | } |
| 5661 | |
| 5662 | else if (runrc == -257) |
| 5663 | expand_string_message = string_sprintf("wait() failed: %s", |
| 5664 | strerror(errno)); |
| 5665 | |
| 5666 | else |
| 5667 | expand_string_message = string_sprintf("command killed by signal %d", |
| 5668 | -runrc); |
| 5669 | |
| 5670 | goto EXPAND_FAILED; |
| 5671 | } |
| 5672 | } |
| 5673 | |
| 5674 | /* Process the yes/no strings; $value may be useful in both cases */ |
| 5675 | |
| 5676 | switch(process_yesno( |
| 5677 | skipping, /* were previously skipping */ |
| 5678 | runrc == 0, /* success/failure indicator */ |
| 5679 | lookup_value, /* value to reset for string2 */ |
| 5680 | &s, /* input pointer */ |
| 5681 | &yield, /* output pointer */ |
| 5682 | US"run", /* condition type */ |
| 5683 | &resetok)) |
| 5684 | { |
| 5685 | case 1: goto EXPAND_FAILED; /* when all is well, the */ |
| 5686 | case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ |
| 5687 | } |
| 5688 | |
| 5689 | continue; |
| 5690 | } |
| 5691 | |
| 5692 | /* Handle character translation for "tr" */ |
| 5693 | |
| 5694 | case EITEM_TR: |
| 5695 | { |
| 5696 | int oldptr = gstring_length(yield); |
| 5697 | int o2m; |
| 5698 | uschar *sub[3]; |
| 5699 | |
| 5700 | switch(read_subs(sub, 3, 3, &s, skipping, TRUE, US"tr", &resetok)) |
| 5701 | { |
| 5702 | case 1: goto EXPAND_FAILED_CURLY; |
| 5703 | case 2: |
| 5704 | case 3: goto EXPAND_FAILED; |
| 5705 | } |
| 5706 | |
| 5707 | yield = string_cat(yield, sub[0]); |
| 5708 | o2m = Ustrlen(sub[2]) - 1; |
| 5709 | |
| 5710 | if (o2m >= 0) for (; oldptr < yield->ptr; oldptr++) |
| 5711 | { |
| 5712 | uschar *m = Ustrrchr(sub[1], yield->s[oldptr]); |
| 5713 | if (m) |
| 5714 | { |
| 5715 | int o = m - sub[1]; |
| 5716 | yield->s[oldptr] = sub[2][(o < o2m)? o : o2m]; |
| 5717 | } |
| 5718 | } |
| 5719 | |
| 5720 | continue; |
| 5721 | } |
| 5722 | |
| 5723 | /* Handle "hash", "length", "nhash", and "substr" when they are given with |
| 5724 | expanded arguments. */ |
| 5725 | |
| 5726 | case EITEM_HASH: |
| 5727 | case EITEM_LENGTH: |
| 5728 | case EITEM_NHASH: |
| 5729 | case EITEM_SUBSTR: |
| 5730 | { |
| 5731 | int len; |
| 5732 | uschar *ret; |
| 5733 | int val[2] = { 0, -1 }; |
| 5734 | uschar *sub[3]; |
| 5735 | |
| 5736 | /* "length" takes only 2 arguments whereas the others take 2 or 3. |
| 5737 | Ensure that sub[2] is set in the ${length } case. */ |
| 5738 | |
| 5739 | sub[2] = NULL; |
| 5740 | switch(read_subs(sub, (item_type == EITEM_LENGTH)? 2:3, 2, &s, skipping, |
| 5741 | TRUE, name, &resetok)) |
| 5742 | { |
| 5743 | case 1: goto EXPAND_FAILED_CURLY; |
| 5744 | case 2: |
| 5745 | case 3: goto EXPAND_FAILED; |
| 5746 | } |
| 5747 | |
| 5748 | /* Juggle the arguments if there are only two of them: always move the |
| 5749 | string to the last position and make ${length{n}{str}} equivalent to |
| 5750 | ${substr{0}{n}{str}}. See the defaults for val[] above. */ |
| 5751 | |
| 5752 | if (!sub[2]) |
| 5753 | { |
| 5754 | sub[2] = sub[1]; |
| 5755 | sub[1] = NULL; |
| 5756 | if (item_type == EITEM_LENGTH) |
| 5757 | { |
| 5758 | sub[1] = sub[0]; |
| 5759 | sub[0] = NULL; |
| 5760 | } |
| 5761 | } |
| 5762 | |
| 5763 | for (int i = 0; i < 2; i++) if (sub[i]) |
| 5764 | { |
| 5765 | val[i] = (int)Ustrtol(sub[i], &ret, 10); |
| 5766 | if (*ret != 0 || (i != 0 && val[i] < 0)) |
| 5767 | { |
| 5768 | expand_string_message = string_sprintf("\"%s\" is not a%s number " |
| 5769 | "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name); |
| 5770 | goto EXPAND_FAILED; |
| 5771 | } |
| 5772 | } |
| 5773 | |
| 5774 | ret = |
| 5775 | item_type == EITEM_HASH |
| 5776 | ? compute_hash(sub[2], val[0], val[1], &len) |
| 5777 | : item_type == EITEM_NHASH |
| 5778 | ? compute_nhash(sub[2], val[0], val[1], &len) |
| 5779 | : extract_substr(sub[2], val[0], val[1], &len); |
| 5780 | if (!ret) |
| 5781 | goto EXPAND_FAILED; |
| 5782 | yield = string_catn(yield, ret, len); |
| 5783 | continue; |
| 5784 | } |
| 5785 | |
| 5786 | /* Handle HMAC computation: ${hmac{<algorithm>}{<secret>}{<text>}} |
| 5787 | This code originally contributed by Steve Haslam. It currently supports |
| 5788 | the use of MD5 and SHA-1 hashes. |
| 5789 | |
| 5790 | We need some workspace that is large enough to handle all the supported |
| 5791 | hash types. Use macros to set the sizes rather than be too elaborate. */ |
| 5792 | |
| 5793 | #define MAX_HASHLEN 20 |
| 5794 | #define MAX_HASHBLOCKLEN 64 |
| 5795 | |
| 5796 | case EITEM_HMAC: |
| 5797 | { |
| 5798 | uschar *sub[3]; |
| 5799 | md5 md5_base; |
| 5800 | hctx sha1_ctx; |
| 5801 | void *use_base; |
| 5802 | int type; |
| 5803 | int hashlen; /* Number of octets for the hash algorithm's output */ |
| 5804 | int hashblocklen; /* Number of octets the hash algorithm processes */ |
| 5805 | uschar *keyptr, *p; |
| 5806 | unsigned int keylen; |
| 5807 | |
| 5808 | uschar keyhash[MAX_HASHLEN]; |
| 5809 | uschar innerhash[MAX_HASHLEN]; |
| 5810 | uschar finalhash[MAX_HASHLEN]; |
| 5811 | uschar finalhash_hex[2*MAX_HASHLEN]; |
| 5812 | uschar innerkey[MAX_HASHBLOCKLEN]; |
| 5813 | uschar outerkey[MAX_HASHBLOCKLEN]; |
| 5814 | |
| 5815 | switch (read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok)) |
| 5816 | { |
| 5817 | case 1: goto EXPAND_FAILED_CURLY; |
| 5818 | case 2: |
| 5819 | case 3: goto EXPAND_FAILED; |
| 5820 | } |
| 5821 | |
| 5822 | if (!skipping) |
| 5823 | { |
| 5824 | if (Ustrcmp(sub[0], "md5") == 0) |
| 5825 | { |
| 5826 | type = HMAC_MD5; |
| 5827 | use_base = &md5_base; |
| 5828 | hashlen = 16; |
| 5829 | hashblocklen = 64; |
| 5830 | } |
| 5831 | else if (Ustrcmp(sub[0], "sha1") == 0) |
| 5832 | { |
| 5833 | type = HMAC_SHA1; |
| 5834 | use_base = &sha1_ctx; |
| 5835 | hashlen = 20; |
| 5836 | hashblocklen = 64; |
| 5837 | } |
| 5838 | else |
| 5839 | { |
| 5840 | expand_string_message = |
| 5841 | string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]); |
| 5842 | goto EXPAND_FAILED; |
| 5843 | } |
| 5844 | |
| 5845 | keyptr = sub[1]; |
| 5846 | keylen = Ustrlen(keyptr); |
| 5847 | |
| 5848 | /* If the key is longer than the hash block length, then hash the key |
| 5849 | first */ |
| 5850 | |
| 5851 | if (keylen > hashblocklen) |
| 5852 | { |
| 5853 | chash_start(type, use_base); |
| 5854 | chash_end(type, use_base, keyptr, keylen, keyhash); |
| 5855 | keyptr = keyhash; |
| 5856 | keylen = hashlen; |
| 5857 | } |
| 5858 | |
| 5859 | /* Now make the inner and outer key values */ |
| 5860 | |
| 5861 | memset(innerkey, 0x36, hashblocklen); |
| 5862 | memset(outerkey, 0x5c, hashblocklen); |
| 5863 | |
| 5864 | for (int i = 0; i < keylen; i++) |
| 5865 | { |
| 5866 | innerkey[i] ^= keyptr[i]; |
| 5867 | outerkey[i] ^= keyptr[i]; |
| 5868 | } |
| 5869 | |
| 5870 | /* Now do the hashes */ |
| 5871 | |
| 5872 | chash_start(type, use_base); |
| 5873 | chash_mid(type, use_base, innerkey); |
| 5874 | chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash); |
| 5875 | |
| 5876 | chash_start(type, use_base); |
| 5877 | chash_mid(type, use_base, outerkey); |
| 5878 | chash_end(type, use_base, innerhash, hashlen, finalhash); |
| 5879 | |
| 5880 | /* Encode the final hash as a hex string */ |
| 5881 | |
| 5882 | p = finalhash_hex; |
| 5883 | for (int i = 0; i < hashlen; i++) |
| 5884 | { |
| 5885 | *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4]; |
| 5886 | *p++ = hex_digits[finalhash[i] & 0x0f]; |
| 5887 | } |
| 5888 | |
| 5889 | DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%s)=%.*s\n", |
| 5890 | sub[0], (int)keylen, keyptr, sub[2], hashlen*2, finalhash_hex); |
| 5891 | |
| 5892 | yield = string_catn(yield, finalhash_hex, hashlen*2); |
| 5893 | } |
| 5894 | continue; |
| 5895 | } |
| 5896 | |
| 5897 | /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator. |
| 5898 | We have to save the numerical variables and restore them afterwards. */ |
| 5899 | |
| 5900 | case EITEM_SG: |
| 5901 | { |
| 5902 | const pcre *re; |
| 5903 | int moffset, moffsetextra, slen; |
| 5904 | int roffset; |
| 5905 | int emptyopt; |
| 5906 | const uschar *rerror; |
| 5907 | uschar *subject; |
| 5908 | uschar *sub[3]; |
| 5909 | int save_expand_nmax = |
| 5910 | save_expand_strings(save_expand_nstring, save_expand_nlength); |
| 5911 | |
| 5912 | switch(read_subs(sub, 3, 3, &s, skipping, TRUE, US"sg", &resetok)) |
| 5913 | { |
| 5914 | case 1: goto EXPAND_FAILED_CURLY; |
| 5915 | case 2: |
| 5916 | case 3: goto EXPAND_FAILED; |
| 5917 | } |
| 5918 | |
| 5919 | /* Compile the regular expression */ |
| 5920 | |
| 5921 | if (!(re = pcre_compile(CS sub[1], PCRE_COPT, CCSS &rerror, |
| 5922 | &roffset, NULL))) |
| 5923 | { |
| 5924 | expand_string_message = string_sprintf("regular expression error in " |
| 5925 | "\"%s\": %s at offset %d", sub[1], rerror, roffset); |
| 5926 | goto EXPAND_FAILED; |
| 5927 | } |
| 5928 | |
| 5929 | /* Now run a loop to do the substitutions as often as necessary. It ends |
| 5930 | when there are no more matches. Take care over matches of the null string; |
| 5931 | do the same thing as Perl does. */ |
| 5932 | |
| 5933 | subject = sub[0]; |
| 5934 | slen = Ustrlen(sub[0]); |
| 5935 | moffset = moffsetextra = 0; |
| 5936 | emptyopt = 0; |
| 5937 | |
| 5938 | for (;;) |
| 5939 | { |
| 5940 | int ovector[3*(EXPAND_MAXN+1)]; |
| 5941 | int n = pcre_exec(re, NULL, CS subject, slen, moffset + moffsetextra, |
| 5942 | PCRE_EOPT | emptyopt, ovector, nelem(ovector)); |
| 5943 | uschar *insert; |
| 5944 | |
| 5945 | /* No match - if we previously set PCRE_NOTEMPTY after a null match, this |
| 5946 | is not necessarily the end. We want to repeat the match from one |
| 5947 | character further along, but leaving the basic offset the same (for |
| 5948 | copying below). We can't be at the end of the string - that was checked |
| 5949 | before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are |
| 5950 | finished; copy the remaining string and end the loop. */ |
| 5951 | |
| 5952 | if (n < 0) |
| 5953 | { |
| 5954 | if (emptyopt != 0) |
| 5955 | { |
| 5956 | moffsetextra = 1; |
| 5957 | emptyopt = 0; |
| 5958 | continue; |
| 5959 | } |
| 5960 | yield = string_catn(yield, subject+moffset, slen-moffset); |
| 5961 | break; |
| 5962 | } |
| 5963 | |
| 5964 | /* Match - set up for expanding the replacement. */ |
| 5965 | |
| 5966 | if (n == 0) n = EXPAND_MAXN + 1; |
| 5967 | expand_nmax = 0; |
| 5968 | for (int nn = 0; nn < n*2; nn += 2) |
| 5969 | { |
| 5970 | expand_nstring[expand_nmax] = subject + ovector[nn]; |
| 5971 | expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn]; |
| 5972 | } |
| 5973 | expand_nmax--; |
| 5974 | |
| 5975 | /* Copy the characters before the match, plus the expanded insertion. */ |
| 5976 | |
| 5977 | yield = string_catn(yield, subject + moffset, ovector[0] - moffset); |
| 5978 | if (!(insert = expand_string(sub[2]))) |
| 5979 | goto EXPAND_FAILED; |
| 5980 | yield = string_cat(yield, insert); |
| 5981 | |
| 5982 | moffset = ovector[1]; |
| 5983 | moffsetextra = 0; |
| 5984 | emptyopt = 0; |
| 5985 | |
| 5986 | /* If we have matched an empty string, first check to see if we are at |
| 5987 | the end of the subject. If so, the loop is over. Otherwise, mimic |
| 5988 | what Perl's /g options does. This turns out to be rather cunning. First |
| 5989 | we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty |
| 5990 | string at the same point. If this fails (picked up above) we advance to |
| 5991 | the next character. */ |
| 5992 | |
| 5993 | if (ovector[0] == ovector[1]) |
| 5994 | { |
| 5995 | if (ovector[0] == slen) break; |
| 5996 | emptyopt = PCRE_NOTEMPTY | PCRE_ANCHORED; |
| 5997 | } |
| 5998 | } |
| 5999 | |
| 6000 | /* All done - restore numerical variables. */ |
| 6001 | |
| 6002 | restore_expand_strings(save_expand_nmax, save_expand_nstring, |
| 6003 | save_expand_nlength); |
| 6004 | continue; |
| 6005 | } |
| 6006 | |
| 6007 | /* Handle keyed and numbered substring extraction. If the first argument |
| 6008 | consists entirely of digits, then a numerical extraction is assumed. */ |
| 6009 | |
| 6010 | case EITEM_EXTRACT: |
| 6011 | { |
| 6012 | int field_number = 1; |
| 6013 | BOOL field_number_set = FALSE; |
| 6014 | uschar *save_lookup_value = lookup_value; |
| 6015 | uschar *sub[3]; |
| 6016 | int save_expand_nmax = |
| 6017 | save_expand_strings(save_expand_nstring, save_expand_nlength); |
| 6018 | |
| 6019 | /* On reflection the original behaviour of extract-json for a string |
| 6020 | result, leaving it quoted, was a mistake. But it was already published, |
| 6021 | hence the addition of jsons. In a future major version, make json |
| 6022 | work like josons, and withdraw jsons. */ |
| 6023 | |
| 6024 | enum {extract_basic, extract_json, extract_jsons} fmt = extract_basic; |
| 6025 | |
| 6026 | while (isspace(*s)) s++; |
| 6027 | |
| 6028 | /* Check for a format-variant specifier */ |
| 6029 | |
| 6030 | if (*s != '{') /*}*/ |
| 6031 | if (Ustrncmp(s, "json", 4) == 0) |
| 6032 | if (*(s += 4) == 's') |
| 6033 | {fmt = extract_jsons; s++;} |
| 6034 | else |
| 6035 | fmt = extract_json; |
| 6036 | |
| 6037 | /* While skipping we cannot rely on the data for expansions being |
| 6038 | available (eg. $item) hence cannot decide on numeric vs. keyed. |
| 6039 | Read a maximum of 5 arguments (including the yes/no) */ |
| 6040 | |
| 6041 | if (skipping) |
| 6042 | { |
| 6043 | for (int j = 5; j > 0 && *s == '{'; j--) /*'}'*/ |
| 6044 | { |
| 6045 | if (!expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)) |
| 6046 | goto EXPAND_FAILED; /*'{'*/ |
| 6047 | if (*s++ != '}') |
| 6048 | { |
| 6049 | expand_string_message = US"missing '{' for arg of extract"; |
| 6050 | goto EXPAND_FAILED_CURLY; |
| 6051 | } |
| 6052 | while (isspace(*s)) s++; |
| 6053 | } |
| 6054 | if ( Ustrncmp(s, "fail", 4) == 0 /*'{'*/ |
| 6055 | && (s[4] == '}' || s[4] == ' ' || s[4] == '\t' || !s[4]) |
| 6056 | ) |
| 6057 | { |
| 6058 | s += 4; |
| 6059 | while (isspace(*s)) s++; |
| 6060 | } /*'{'*/ |
| 6061 | if (*s != '}') |
| 6062 | { |
| 6063 | expand_string_message = US"missing '}' closing extract"; |
| 6064 | goto EXPAND_FAILED_CURLY; |
| 6065 | } |
| 6066 | } |
| 6067 | |
| 6068 | else for (int i = 0, j = 2; i < j; i++) /* Read the proper number of arguments */ |
| 6069 | { |
| 6070 | while (isspace(*s)) s++; |
| 6071 | if (*s == '{') /*'}'*/ |
| 6072 | { |
| 6073 | if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok))) |
| 6074 | goto EXPAND_FAILED; /*'{'*/ |
| 6075 | if (*s++ != '}') |
| 6076 | { |
| 6077 | expand_string_message = string_sprintf( |
| 6078 | "missing '}' closing arg %d of extract", i+1); |
| 6079 | goto EXPAND_FAILED_CURLY; |
| 6080 | } |
| 6081 | |
| 6082 | /* After removal of leading and trailing white space, the first |
| 6083 | argument must not be empty; if it consists entirely of digits |
| 6084 | (optionally preceded by a minus sign), this is a numerical |
| 6085 | extraction, and we expect 3 arguments (normal) or 2 (json). */ |
| 6086 | |
| 6087 | if (i == 0) |
| 6088 | { |
| 6089 | int len; |
| 6090 | int x = 0; |
| 6091 | uschar *p = sub[0]; |
| 6092 | |
| 6093 | while (isspace(*p)) p++; |
| 6094 | sub[0] = p; |
| 6095 | |
| 6096 | len = Ustrlen(p); |
| 6097 | while (len > 0 && isspace(p[len-1])) len--; |
| 6098 | p[len] = 0; |
| 6099 | |
| 6100 | if (*p == 0) |
| 6101 | { |
| 6102 | expand_string_message = US"first argument of \"extract\" must " |
| 6103 | "not be empty"; |
| 6104 | goto EXPAND_FAILED; |
| 6105 | } |
| 6106 | |
| 6107 | if (*p == '-') |
| 6108 | { |
| 6109 | field_number = -1; |
| 6110 | p++; |
| 6111 | } |
| 6112 | while (*p != 0 && isdigit(*p)) x = x * 10 + *p++ - '0'; |
| 6113 | if (*p == 0) |
| 6114 | { |
| 6115 | field_number *= x; |
| 6116 | if (fmt == extract_basic) j = 3; /* Need 3 args */ |
| 6117 | field_number_set = TRUE; |
| 6118 | } |
| 6119 | } |
| 6120 | } |
| 6121 | else |
| 6122 | { |
| 6123 | expand_string_message = string_sprintf( |
| 6124 | "missing '{' for arg %d of extract", i+1); |
| 6125 | goto EXPAND_FAILED_CURLY; |
| 6126 | } |
| 6127 | } |
| 6128 | |
| 6129 | /* Extract either the numbered or the keyed substring into $value. If |
| 6130 | skipping, just pretend the extraction failed. */ |
| 6131 | |
| 6132 | if (skipping) |
| 6133 | lookup_value = NULL; |
| 6134 | else switch (fmt) |
| 6135 | { |
| 6136 | case extract_basic: |
| 6137 | lookup_value = field_number_set |
| 6138 | ? expand_gettokened(field_number, sub[1], sub[2]) |
| 6139 | : expand_getkeyed(sub[0], sub[1]); |
| 6140 | break; |
| 6141 | |
| 6142 | case extract_json: |
| 6143 | case extract_jsons: |
| 6144 | { |
| 6145 | uschar * s, * item; |
| 6146 | const uschar * list; |
| 6147 | |
| 6148 | /* Array: Bracket-enclosed and comma-separated. |
| 6149 | Object: Brace-enclosed, comma-sep list of name:value pairs */ |
| 6150 | |
| 6151 | if (!(s = dewrap(sub[1], field_number_set ? US"[]" : US"{}"))) |
| 6152 | { |
| 6153 | expand_string_message = |
| 6154 | string_sprintf("%s wrapping %s for extract json", |
| 6155 | expand_string_message, |
| 6156 | field_number_set ? "array" : "object"); |
| 6157 | goto EXPAND_FAILED_CURLY; |
| 6158 | } |
| 6159 | |
| 6160 | list = s; |
| 6161 | if (field_number_set) |
| 6162 | { |
| 6163 | if (field_number <= 0) |
| 6164 | { |
| 6165 | expand_string_message = US"first argument of \"extract\" must " |
| 6166 | "be greater than zero"; |
| 6167 | goto EXPAND_FAILED; |
| 6168 | } |
| 6169 | while (field_number > 0 && (item = json_nextinlist(&list))) |
| 6170 | field_number--; |
| 6171 | if ((lookup_value = s = item)) |
| 6172 | { |
| 6173 | while (*s) s++; |
| 6174 | while (--s >= lookup_value && isspace(*s)) *s = '\0'; |
| 6175 | } |
| 6176 | } |
| 6177 | else |
| 6178 | { |
| 6179 | lookup_value = NULL; |
| 6180 | while ((item = json_nextinlist(&list))) |
| 6181 | { |
| 6182 | /* Item is: string name-sep value. string is quoted. |
| 6183 | Dequote the string and compare with the search key. */ |
| 6184 | |
| 6185 | if (!(item = dewrap(item, US"\"\""))) |
| 6186 | { |
| 6187 | expand_string_message = |
| 6188 | string_sprintf("%s wrapping string key for extract json", |
| 6189 | expand_string_message); |
| 6190 | goto EXPAND_FAILED_CURLY; |
| 6191 | } |
| 6192 | if (Ustrcmp(item, sub[0]) == 0) /*XXX should be a UTF8-compare */ |
| 6193 | { |
| 6194 | s = item + Ustrlen(item) + 1; |
| 6195 | while (isspace(*s)) s++; |
| 6196 | if (*s != ':') |
| 6197 | { |
| 6198 | expand_string_message = |
| 6199 | US"missing object value-separator for extract json"; |
| 6200 | goto EXPAND_FAILED_CURLY; |
| 6201 | } |
| 6202 | s++; |
| 6203 | while (isspace(*s)) s++; |
| 6204 | lookup_value = s; |
| 6205 | break; |
| 6206 | } |
| 6207 | } |
| 6208 | } |
| 6209 | } |
| 6210 | |
| 6211 | if ( fmt == extract_jsons |
| 6212 | && lookup_value |
| 6213 | && !(lookup_value = dewrap(lookup_value, US"\"\""))) |
| 6214 | { |
| 6215 | expand_string_message = |
| 6216 | string_sprintf("%s wrapping string result for extract jsons", |
| 6217 | expand_string_message); |
| 6218 | goto EXPAND_FAILED_CURLY; |
| 6219 | } |
| 6220 | break; /* json/s */ |
| 6221 | } |
| 6222 | |
| 6223 | /* If no string follows, $value gets substituted; otherwise there can |
| 6224 | be yes/no strings, as for lookup or if. */ |
| 6225 | |
| 6226 | switch(process_yesno( |
| 6227 | skipping, /* were previously skipping */ |
| 6228 | lookup_value != NULL, /* success/failure indicator */ |
| 6229 | save_lookup_value, /* value to reset for string2 */ |
| 6230 | &s, /* input pointer */ |
| 6231 | &yield, /* output pointer */ |
| 6232 | US"extract", /* condition type */ |
| 6233 | &resetok)) |
| 6234 | { |
| 6235 | case 1: goto EXPAND_FAILED; /* when all is well, the */ |
| 6236 | case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ |
| 6237 | } |
| 6238 | |
| 6239 | /* All done - restore numerical variables. */ |
| 6240 | |
| 6241 | restore_expand_strings(save_expand_nmax, save_expand_nstring, |
| 6242 | save_expand_nlength); |
| 6243 | |
| 6244 | continue; |
| 6245 | } |
| 6246 | |
| 6247 | /* return the Nth item from a list */ |
| 6248 | |
| 6249 | case EITEM_LISTEXTRACT: |
| 6250 | { |
| 6251 | int field_number = 1; |
| 6252 | uschar *save_lookup_value = lookup_value; |
| 6253 | uschar *sub[2]; |
| 6254 | int save_expand_nmax = |
| 6255 | save_expand_strings(save_expand_nstring, save_expand_nlength); |
| 6256 | |
| 6257 | /* Read the field & list arguments */ |
| 6258 | |
| 6259 | for (int i = 0; i < 2; i++) |
| 6260 | { |
| 6261 | while (isspace(*s)) s++; |
| 6262 | if (*s != '{') /*'}'*/ |
| 6263 | { |
| 6264 | expand_string_message = string_sprintf( |
| 6265 | "missing '{' for arg %d of listextract", i+1); |
| 6266 | goto EXPAND_FAILED_CURLY; |
| 6267 | } |
| 6268 | |
| 6269 | sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok); |
| 6270 | if (!sub[i]) goto EXPAND_FAILED; /*{*/ |
| 6271 | if (*s++ != '}') |
| 6272 | { |
| 6273 | expand_string_message = string_sprintf( |
| 6274 | "missing '}' closing arg %d of listextract", i+1); |
| 6275 | goto EXPAND_FAILED_CURLY; |
| 6276 | } |
| 6277 | |
| 6278 | /* After removal of leading and trailing white space, the first |
| 6279 | argument must be numeric and nonempty. */ |
| 6280 | |
| 6281 | if (i == 0) |
| 6282 | { |
| 6283 | int len; |
| 6284 | int x = 0; |
| 6285 | uschar *p = sub[0]; |
| 6286 | |
| 6287 | while (isspace(*p)) p++; |
| 6288 | sub[0] = p; |
| 6289 | |
| 6290 | len = Ustrlen(p); |
| 6291 | while (len > 0 && isspace(p[len-1])) len--; |
| 6292 | p[len] = 0; |
| 6293 | |
| 6294 | if (!*p && !skipping) |
| 6295 | { |
| 6296 | expand_string_message = US"first argument of \"listextract\" must " |
| 6297 | "not be empty"; |
| 6298 | goto EXPAND_FAILED; |
| 6299 | } |
| 6300 | |
| 6301 | if (*p == '-') |
| 6302 | { |
| 6303 | field_number = -1; |
| 6304 | p++; |
| 6305 | } |
| 6306 | while (*p && isdigit(*p)) x = x * 10 + *p++ - '0'; |
| 6307 | if (*p) |
| 6308 | { |
| 6309 | expand_string_message = US"first argument of \"listextract\" must " |
| 6310 | "be numeric"; |
| 6311 | goto EXPAND_FAILED; |
| 6312 | } |
| 6313 | field_number *= x; |
| 6314 | } |
| 6315 | } |
| 6316 | |
| 6317 | /* Extract the numbered element into $value. If |
| 6318 | skipping, just pretend the extraction failed. */ |
| 6319 | |
| 6320 | lookup_value = skipping ? NULL : expand_getlistele(field_number, sub[1]); |
| 6321 | |
| 6322 | /* If no string follows, $value gets substituted; otherwise there can |
| 6323 | be yes/no strings, as for lookup or if. */ |
| 6324 | |
| 6325 | switch(process_yesno( |
| 6326 | skipping, /* were previously skipping */ |
| 6327 | lookup_value != NULL, /* success/failure indicator */ |
| 6328 | save_lookup_value, /* value to reset for string2 */ |
| 6329 | &s, /* input pointer */ |
| 6330 | &yield, /* output pointer */ |
| 6331 | US"listextract", /* condition type */ |
| 6332 | &resetok)) |
| 6333 | { |
| 6334 | case 1: goto EXPAND_FAILED; /* when all is well, the */ |
| 6335 | case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ |
| 6336 | } |
| 6337 | |
| 6338 | /* All done - restore numerical variables. */ |
| 6339 | |
| 6340 | restore_expand_strings(save_expand_nmax, save_expand_nstring, |
| 6341 | save_expand_nlength); |
| 6342 | |
| 6343 | continue; |
| 6344 | } |
| 6345 | |
| 6346 | #ifndef DISABLE_TLS |
| 6347 | case EITEM_CERTEXTRACT: |
| 6348 | { |
| 6349 | uschar *save_lookup_value = lookup_value; |
| 6350 | uschar *sub[2]; |
| 6351 | int save_expand_nmax = |
| 6352 | save_expand_strings(save_expand_nstring, save_expand_nlength); |
| 6353 | |
| 6354 | /* Read the field argument */ |
| 6355 | while (isspace(*s)) s++; |
| 6356 | if (*s != '{') /*}*/ |
| 6357 | { |
| 6358 | expand_string_message = US"missing '{' for field arg of certextract"; |
| 6359 | goto EXPAND_FAILED_CURLY; |
| 6360 | } |
| 6361 | sub[0] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok); |
| 6362 | if (!sub[0]) goto EXPAND_FAILED; /*{*/ |
| 6363 | if (*s++ != '}') |
| 6364 | { |
| 6365 | expand_string_message = US"missing '}' closing field arg of certextract"; |
| 6366 | goto EXPAND_FAILED_CURLY; |
| 6367 | } |
| 6368 | /* strip spaces fore & aft */ |
| 6369 | { |
| 6370 | int len; |
| 6371 | uschar *p = sub[0]; |
| 6372 | |
| 6373 | while (isspace(*p)) p++; |
| 6374 | sub[0] = p; |
| 6375 | |
| 6376 | len = Ustrlen(p); |
| 6377 | while (len > 0 && isspace(p[len-1])) len--; |
| 6378 | p[len] = 0; |
| 6379 | } |
| 6380 | |
| 6381 | /* inspect the cert argument */ |
| 6382 | while (isspace(*s)) s++; |
| 6383 | if (*s != '{') /*}*/ |
| 6384 | { |
| 6385 | expand_string_message = US"missing '{' for cert variable arg of certextract"; |
| 6386 | goto EXPAND_FAILED_CURLY; |
| 6387 | } |
| 6388 | if (*++s != '$') |
| 6389 | { |
| 6390 | expand_string_message = US"second argument of \"certextract\" must " |
| 6391 | "be a certificate variable"; |
| 6392 | goto EXPAND_FAILED; |
| 6393 | } |
| 6394 | sub[1] = expand_string_internal(s+1, TRUE, &s, skipping, FALSE, &resetok); |
| 6395 | if (!sub[1]) goto EXPAND_FAILED; /*{*/ |
| 6396 | if (*s++ != '}') |
| 6397 | { |
| 6398 | expand_string_message = US"missing '}' closing cert variable arg of certextract"; |
| 6399 | goto EXPAND_FAILED_CURLY; |
| 6400 | } |
| 6401 | |
| 6402 | if (skipping) |
| 6403 | lookup_value = NULL; |
| 6404 | else |
| 6405 | { |
| 6406 | lookup_value = expand_getcertele(sub[0], sub[1]); |
| 6407 | if (*expand_string_message) goto EXPAND_FAILED; |
| 6408 | } |
| 6409 | switch(process_yesno( |
| 6410 | skipping, /* were previously skipping */ |
| 6411 | lookup_value != NULL, /* success/failure indicator */ |
| 6412 | save_lookup_value, /* value to reset for string2 */ |
| 6413 | &s, /* input pointer */ |
| 6414 | &yield, /* output pointer */ |
| 6415 | US"certextract", /* condition type */ |
| 6416 | &resetok)) |
| 6417 | { |
| 6418 | case 1: goto EXPAND_FAILED; /* when all is well, the */ |
| 6419 | case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ |
| 6420 | } |
| 6421 | |
| 6422 | restore_expand_strings(save_expand_nmax, save_expand_nstring, |
| 6423 | save_expand_nlength); |
| 6424 | continue; |
| 6425 | } |
| 6426 | #endif /*DISABLE_TLS*/ |
| 6427 | |
| 6428 | /* Handle list operations */ |
| 6429 | |
| 6430 | case EITEM_FILTER: |
| 6431 | case EITEM_MAP: |
| 6432 | case EITEM_REDUCE: |
| 6433 | { |
| 6434 | int sep = 0; |
| 6435 | int save_ptr = gstring_length(yield); |
| 6436 | uschar outsep[2] = { '\0', '\0' }; |
| 6437 | const uschar *list, *expr, *temp; |
| 6438 | uschar *save_iterate_item = iterate_item; |
| 6439 | uschar *save_lookup_value = lookup_value; |
| 6440 | |
| 6441 | while (isspace(*s)) s++; |
| 6442 | if (*s++ != '{') |
| 6443 | { |
| 6444 | expand_string_message = |
| 6445 | string_sprintf("missing '{' for first arg of %s", name); |
| 6446 | goto EXPAND_FAILED_CURLY; |
| 6447 | } |
| 6448 | |
| 6449 | if (!(list = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok))) |
| 6450 | goto EXPAND_FAILED; |
| 6451 | if (*s++ != '}') |
| 6452 | { |
| 6453 | expand_string_message = |
| 6454 | string_sprintf("missing '}' closing first arg of %s", name); |
| 6455 | goto EXPAND_FAILED_CURLY; |
| 6456 | } |
| 6457 | |
| 6458 | if (item_type == EITEM_REDUCE) |
| 6459 | { |
| 6460 | uschar * t; |
| 6461 | while (isspace(*s)) s++; |
| 6462 | if (*s++ != '{') |
| 6463 | { |
| 6464 | expand_string_message = US"missing '{' for second arg of reduce"; |
| 6465 | goto EXPAND_FAILED_CURLY; |
| 6466 | } |
| 6467 | t = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok); |
| 6468 | if (!t) goto EXPAND_FAILED; |
| 6469 | lookup_value = t; |
| 6470 | if (*s++ != '}') |
| 6471 | { |
| 6472 | expand_string_message = US"missing '}' closing second arg of reduce"; |
| 6473 | goto EXPAND_FAILED_CURLY; |
| 6474 | } |
| 6475 | } |
| 6476 | |
| 6477 | while (isspace(*s)) s++; |
| 6478 | if (*s++ != '{') |
| 6479 | { |
| 6480 | expand_string_message = |
| 6481 | string_sprintf("missing '{' for last arg of %s", name); |
| 6482 | goto EXPAND_FAILED_CURLY; |
| 6483 | } |
| 6484 | |
| 6485 | expr = s; |
| 6486 | |
| 6487 | /* For EITEM_FILTER, call eval_condition once, with result discarded (as |
| 6488 | if scanning a "false" part). This allows us to find the end of the |
| 6489 | condition, because if the list is empty, we won't actually evaluate the |
| 6490 | condition for real. For EITEM_MAP and EITEM_REDUCE, do the same, using |
| 6491 | the normal internal expansion function. */ |
| 6492 | |
| 6493 | if (item_type == EITEM_FILTER) |
| 6494 | { |
| 6495 | if ((temp = eval_condition(expr, &resetok, NULL))) |
| 6496 | s = temp; |
| 6497 | } |
| 6498 | else |
| 6499 | temp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok); |
| 6500 | |
| 6501 | if (!temp) |
| 6502 | { |
| 6503 | expand_string_message = string_sprintf("%s inside \"%s\" item", |
| 6504 | expand_string_message, name); |
| 6505 | goto EXPAND_FAILED; |
| 6506 | } |
| 6507 | |
| 6508 | while (isspace(*s)) s++; |
| 6509 | if (*s++ != '}') |
| 6510 | { /*{*/ |
| 6511 | expand_string_message = string_sprintf("missing } at end of condition " |
| 6512 | "or expression inside \"%s\"; could be an unquoted } in the content", |
| 6513 | name); |
| 6514 | goto EXPAND_FAILED; |
| 6515 | } |
| 6516 | |
| 6517 | while (isspace(*s)) s++; /*{*/ |
| 6518 | if (*s++ != '}') |
| 6519 | { /*{*/ |
| 6520 | expand_string_message = string_sprintf("missing } at end of \"%s\"", |
| 6521 | name); |
| 6522 | goto EXPAND_FAILED; |
| 6523 | } |
| 6524 | |
| 6525 | /* If we are skipping, we can now just move on to the next item. When |
| 6526 | processing for real, we perform the iteration. */ |
| 6527 | |
| 6528 | if (skipping) continue; |
| 6529 | while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0))) |
| 6530 | { |
| 6531 | *outsep = (uschar)sep; /* Separator as a string */ |
| 6532 | |
| 6533 | DEBUG(D_expand) debug_printf_indent("%s: $item = '%s' $value = '%s'\n", |
| 6534 | name, iterate_item, lookup_value); |
| 6535 | |
| 6536 | if (item_type == EITEM_FILTER) |
| 6537 | { |
| 6538 | BOOL condresult; |
| 6539 | if (!eval_condition(expr, &resetok, &condresult)) |
| 6540 | { |
| 6541 | iterate_item = save_iterate_item; |
| 6542 | lookup_value = save_lookup_value; |
| 6543 | expand_string_message = string_sprintf("%s inside \"%s\" condition", |
| 6544 | expand_string_message, name); |
| 6545 | goto EXPAND_FAILED; |
| 6546 | } |
| 6547 | DEBUG(D_expand) debug_printf_indent("%s: condition is %s\n", name, |
| 6548 | condresult? "true":"false"); |
| 6549 | if (condresult) |
| 6550 | temp = iterate_item; /* TRUE => include this item */ |
| 6551 | else |
| 6552 | continue; /* FALSE => skip this item */ |
| 6553 | } |
| 6554 | |
| 6555 | /* EITEM_MAP and EITEM_REDUCE */ |
| 6556 | |
| 6557 | else |
| 6558 | { |
| 6559 | uschar * t = expand_string_internal(expr, TRUE, NULL, skipping, TRUE, &resetok); |
| 6560 | temp = t; |
| 6561 | if (!temp) |
| 6562 | { |
| 6563 | iterate_item = save_iterate_item; |
| 6564 | expand_string_message = string_sprintf("%s inside \"%s\" item", |
| 6565 | expand_string_message, name); |
| 6566 | goto EXPAND_FAILED; |
| 6567 | } |
| 6568 | if (item_type == EITEM_REDUCE) |
| 6569 | { |
| 6570 | lookup_value = t; /* Update the value of $value */ |
| 6571 | continue; /* and continue the iteration */ |
| 6572 | } |
| 6573 | } |
| 6574 | |
| 6575 | /* We reach here for FILTER if the condition is true, always for MAP, |
| 6576 | and never for REDUCE. The value in "temp" is to be added to the output |
| 6577 | list that is being created, ensuring that any occurrences of the |
| 6578 | separator character are doubled. Unless we are dealing with the first |
| 6579 | item of the output list, add in a space if the new item begins with the |
| 6580 | separator character, or is an empty string. */ |
| 6581 | |
| 6582 | if ( yield && yield->ptr != save_ptr |
| 6583 | && (temp[0] == *outsep || temp[0] == 0)) |
| 6584 | yield = string_catn(yield, US" ", 1); |
| 6585 | |
| 6586 | /* Add the string in "temp" to the output list that we are building, |
| 6587 | This is done in chunks by searching for the separator character. */ |
| 6588 | |
| 6589 | for (;;) |
| 6590 | { |
| 6591 | size_t seglen = Ustrcspn(temp, outsep); |
| 6592 | |
| 6593 | yield = string_catn(yield, temp, seglen + 1); |
| 6594 | |
| 6595 | /* If we got to the end of the string we output one character |
| 6596 | too many; backup and end the loop. Otherwise arrange to double the |
| 6597 | separator. */ |
| 6598 | |
| 6599 | if (temp[seglen] == '\0') { yield->ptr--; break; } |
| 6600 | yield = string_catn(yield, outsep, 1); |
| 6601 | temp += seglen + 1; |
| 6602 | } |
| 6603 | |
| 6604 | /* Output a separator after the string: we will remove the redundant |
| 6605 | final one at the end. */ |
| 6606 | |
| 6607 | yield = string_catn(yield, outsep, 1); |
| 6608 | } /* End of iteration over the list loop */ |
| 6609 | |
| 6610 | /* REDUCE has generated no output above: output the final value of |
| 6611 | $value. */ |
| 6612 | |
| 6613 | if (item_type == EITEM_REDUCE) |
| 6614 | { |
| 6615 | yield = string_cat(yield, lookup_value); |
| 6616 | lookup_value = save_lookup_value; /* Restore $value */ |
| 6617 | } |
| 6618 | |
| 6619 | /* FILTER and MAP generate lists: if they have generated anything, remove |
| 6620 | the redundant final separator. Even though an empty item at the end of a |
| 6621 | list does not count, this is tidier. */ |
| 6622 | |
| 6623 | else if (yield && yield->ptr != save_ptr) yield->ptr--; |
| 6624 | |
| 6625 | /* Restore preserved $item */ |
| 6626 | |
| 6627 | iterate_item = save_iterate_item; |
| 6628 | continue; |
| 6629 | } |
| 6630 | |
| 6631 | case EITEM_SORT: |
| 6632 | { |
| 6633 | int cond_type; |
| 6634 | int sep = 0; |
| 6635 | const uschar *srclist, *cmp, *xtract; |
| 6636 | uschar * opname, * srcitem; |
| 6637 | const uschar *dstlist = NULL, *dstkeylist = NULL; |
| 6638 | uschar * tmp; |
| 6639 | uschar *save_iterate_item = iterate_item; |
| 6640 | |
| 6641 | while (isspace(*s)) s++; |
| 6642 | if (*s++ != '{') |
| 6643 | { |
| 6644 | expand_string_message = US"missing '{' for list arg of sort"; |
| 6645 | goto EXPAND_FAILED_CURLY; |
| 6646 | } |
| 6647 | |
| 6648 | srclist = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok); |
| 6649 | if (!srclist) goto EXPAND_FAILED; |
| 6650 | if (*s++ != '}') |
| 6651 | { |
| 6652 | expand_string_message = US"missing '}' closing list arg of sort"; |
| 6653 | goto EXPAND_FAILED_CURLY; |
| 6654 | } |
| 6655 | |
| 6656 | while (isspace(*s)) s++; |
| 6657 | if (*s++ != '{') |
| 6658 | { |
| 6659 | expand_string_message = US"missing '{' for comparator arg of sort"; |
| 6660 | goto EXPAND_FAILED_CURLY; |
| 6661 | } |
| 6662 | |
| 6663 | cmp = expand_string_internal(s, TRUE, &s, skipping, FALSE, &resetok); |
| 6664 | if (!cmp) goto EXPAND_FAILED; |
| 6665 | if (*s++ != '}') |
| 6666 | { |
| 6667 | expand_string_message = US"missing '}' closing comparator arg of sort"; |
| 6668 | goto EXPAND_FAILED_CURLY; |
| 6669 | } |
| 6670 | |
| 6671 | if ((cond_type = identify_operator(&cmp, &opname)) == -1) |
| 6672 | { |
| 6673 | if (!expand_string_message) |
| 6674 | expand_string_message = string_sprintf("unknown condition \"%s\"", s); |
| 6675 | goto EXPAND_FAILED; |
| 6676 | } |
| 6677 | switch(cond_type) |
| 6678 | { |
| 6679 | case ECOND_NUM_L: case ECOND_NUM_LE: |
| 6680 | case ECOND_NUM_G: case ECOND_NUM_GE: |
| 6681 | case ECOND_STR_GE: case ECOND_STR_GEI: case ECOND_STR_GT: case ECOND_STR_GTI: |
| 6682 | case ECOND_STR_LE: case ECOND_STR_LEI: case ECOND_STR_LT: case ECOND_STR_LTI: |
| 6683 | break; |
| 6684 | |
| 6685 | default: |
| 6686 | expand_string_message = US"comparator not handled for sort"; |
| 6687 | goto EXPAND_FAILED; |
| 6688 | } |
| 6689 | |
| 6690 | while (isspace(*s)) s++; |
| 6691 | if (*s++ != '{') |
| 6692 | { |
| 6693 | expand_string_message = US"missing '{' for extractor arg of sort"; |
| 6694 | goto EXPAND_FAILED_CURLY; |
| 6695 | } |
| 6696 | |
| 6697 | xtract = s; |
| 6698 | if (!(tmp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok))) |
| 6699 | goto EXPAND_FAILED; |
| 6700 | xtract = string_copyn(xtract, s - xtract); |
| 6701 | |
| 6702 | if (*s++ != '}') |
| 6703 | { |
| 6704 | expand_string_message = US"missing '}' closing extractor arg of sort"; |
| 6705 | goto EXPAND_FAILED_CURLY; |
| 6706 | } |
| 6707 | /*{*/ |
| 6708 | if (*s++ != '}') |
| 6709 | { /*{*/ |
| 6710 | expand_string_message = US"missing } at end of \"sort\""; |
| 6711 | goto EXPAND_FAILED; |
| 6712 | } |
| 6713 | |
| 6714 | if (skipping) continue; |
| 6715 | |
| 6716 | while ((srcitem = string_nextinlist(&srclist, &sep, NULL, 0))) |
| 6717 | { |
| 6718 | uschar * srcfield, * dstitem; |
| 6719 | gstring * newlist = NULL; |
| 6720 | gstring * newkeylist = NULL; |
| 6721 | |
| 6722 | DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, srcitem); |
| 6723 | |
| 6724 | /* extract field for comparisons */ |
| 6725 | iterate_item = srcitem; |
| 6726 | if ( !(srcfield = expand_string_internal(xtract, FALSE, NULL, FALSE, |
| 6727 | TRUE, &resetok)) |
| 6728 | || !*srcfield) |
| 6729 | { |
| 6730 | expand_string_message = string_sprintf( |
| 6731 | "field-extract in sort: \"%s\"", xtract); |
| 6732 | goto EXPAND_FAILED; |
| 6733 | } |
| 6734 | |
| 6735 | /* Insertion sort */ |
| 6736 | |
| 6737 | /* copy output list until new-item < list-item */ |
| 6738 | while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0))) |
| 6739 | { |
| 6740 | uschar * dstfield; |
| 6741 | |
| 6742 | /* field for comparison */ |
| 6743 | if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0))) |
| 6744 | goto sort_mismatch; |
| 6745 | |
| 6746 | /* String-comparator names start with a letter; numeric names do not */ |
| 6747 | |
| 6748 | if (sortsbefore(cond_type, isalpha(opname[0]), |
| 6749 | srcfield, dstfield)) |
| 6750 | { |
| 6751 | /* New-item sorts before this dst-item. Append new-item, |
| 6752 | then dst-item, then remainder of dst list. */ |
| 6753 | |
| 6754 | newlist = string_append_listele(newlist, sep, srcitem); |
| 6755 | newkeylist = string_append_listele(newkeylist, sep, srcfield); |
| 6756 | srcitem = NULL; |
| 6757 | |
| 6758 | newlist = string_append_listele(newlist, sep, dstitem); |
| 6759 | newkeylist = string_append_listele(newkeylist, sep, dstfield); |
| 6760 | |
| 6761 | /*XXX why field-at-a-time copy? Why not just dup the rest of the list? */ |
| 6762 | while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0))) |
| 6763 | { |
| 6764 | if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0))) |
| 6765 | goto sort_mismatch; |
| 6766 | newlist = string_append_listele(newlist, sep, dstitem); |
| 6767 | newkeylist = string_append_listele(newkeylist, sep, dstfield); |
| 6768 | } |
| 6769 | |
| 6770 | break; |
| 6771 | } |
| 6772 | |
| 6773 | newlist = string_append_listele(newlist, sep, dstitem); |
| 6774 | newkeylist = string_append_listele(newkeylist, sep, dstfield); |
| 6775 | } |
| 6776 | |
| 6777 | /* If we ran out of dstlist without consuming srcitem, append it */ |
| 6778 | if (srcitem) |
| 6779 | { |
| 6780 | newlist = string_append_listele(newlist, sep, srcitem); |
| 6781 | newkeylist = string_append_listele(newkeylist, sep, srcfield); |
| 6782 | } |
| 6783 | |
| 6784 | dstlist = newlist->s; |
| 6785 | dstkeylist = newkeylist->s; |
| 6786 | |
| 6787 | DEBUG(D_expand) debug_printf_indent("%s: dstlist = \"%s\"\n", name, dstlist); |
| 6788 | DEBUG(D_expand) debug_printf_indent("%s: dstkeylist = \"%s\"\n", name, dstkeylist); |
| 6789 | } |
| 6790 | |
| 6791 | if (dstlist) |
| 6792 | yield = string_cat(yield, dstlist); |
| 6793 | |
| 6794 | /* Restore preserved $item */ |
| 6795 | iterate_item = save_iterate_item; |
| 6796 | continue; |
| 6797 | |
| 6798 | sort_mismatch: |
| 6799 | expand_string_message = US"Internal error in sort (list mismatch)"; |
| 6800 | goto EXPAND_FAILED; |
| 6801 | } |
| 6802 | |
| 6803 | |
| 6804 | /* If ${dlfunc } support is configured, handle calling dynamically-loaded |
| 6805 | functions, unless locked out at this time. Syntax is ${dlfunc{file}{func}} |
| 6806 | or ${dlfunc{file}{func}{arg}} or ${dlfunc{file}{func}{arg1}{arg2}} or up to |
| 6807 | a maximum of EXPAND_DLFUNC_MAX_ARGS arguments (defined below). */ |
| 6808 | |
| 6809 | #define EXPAND_DLFUNC_MAX_ARGS 8 |
| 6810 | |
| 6811 | case EITEM_DLFUNC: |
| 6812 | #ifndef EXPAND_DLFUNC |
| 6813 | expand_string_message = US"\"${dlfunc\" encountered, but this facility " /*}*/ |
| 6814 | "is not included in this binary"; |
| 6815 | goto EXPAND_FAILED; |
| 6816 | |
| 6817 | #else /* EXPAND_DLFUNC */ |
| 6818 | { |
| 6819 | tree_node *t; |
| 6820 | exim_dlfunc_t *func; |
| 6821 | uschar *result; |
| 6822 | int status, argc; |
| 6823 | uschar *argv[EXPAND_DLFUNC_MAX_ARGS + 3]; |
| 6824 | |
| 6825 | if ((expand_forbid & RDO_DLFUNC) != 0) |
| 6826 | { |
| 6827 | expand_string_message = |
| 6828 | US"dynamically-loaded functions are not permitted"; |
| 6829 | goto EXPAND_FAILED; |
| 6830 | } |
| 6831 | |
| 6832 | switch(read_subs(argv, EXPAND_DLFUNC_MAX_ARGS + 2, 2, &s, skipping, |
| 6833 | TRUE, US"dlfunc", &resetok)) |
| 6834 | { |
| 6835 | case 1: goto EXPAND_FAILED_CURLY; |
| 6836 | case 2: |
| 6837 | case 3: goto EXPAND_FAILED; |
| 6838 | } |
| 6839 | |
| 6840 | /* If skipping, we don't actually do anything */ |
| 6841 | |
| 6842 | if (skipping) continue; |
| 6843 | |
| 6844 | /* Look up the dynamically loaded object handle in the tree. If it isn't |
| 6845 | found, dlopen() the file and put the handle in the tree for next time. */ |
| 6846 | |
| 6847 | if (!(t = tree_search(dlobj_anchor, argv[0]))) |
| 6848 | { |
| 6849 | void *handle = dlopen(CS argv[0], RTLD_LAZY); |
| 6850 | if (!handle) |
| 6851 | { |
| 6852 | expand_string_message = string_sprintf("dlopen \"%s\" failed: %s", |
| 6853 | argv[0], dlerror()); |
| 6854 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message); |
| 6855 | goto EXPAND_FAILED; |
| 6856 | } |
| 6857 | t = store_get_perm(sizeof(tree_node) + Ustrlen(argv[0]), is_tainted(argv[0])); |
| 6858 | Ustrcpy(t->name, argv[0]); |
| 6859 | t->data.ptr = handle; |
| 6860 | (void)tree_insertnode(&dlobj_anchor, t); |
| 6861 | } |
| 6862 | |
| 6863 | /* Having obtained the dynamically loaded object handle, look up the |
| 6864 | function pointer. */ |
| 6865 | |
| 6866 | if (!(func = (exim_dlfunc_t *)dlsym(t->data.ptr, CS argv[1]))) |
| 6867 | { |
| 6868 | expand_string_message = string_sprintf("dlsym \"%s\" in \"%s\" failed: " |
| 6869 | "%s", argv[1], argv[0], dlerror()); |
| 6870 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message); |
| 6871 | goto EXPAND_FAILED; |
| 6872 | } |
| 6873 | |
| 6874 | /* Call the function and work out what to do with the result. If it |
| 6875 | returns OK, we have a replacement string; if it returns DEFER then |
| 6876 | expansion has failed in a non-forced manner; if it returns FAIL then |
| 6877 | failure was forced; if it returns ERROR or any other value there's a |
| 6878 | problem, so panic slightly. In any case, assume that the function has |
| 6879 | side-effects on the store that must be preserved. */ |
| 6880 | |
| 6881 | resetok = FALSE; |
| 6882 | result = NULL; |
| 6883 | for (argc = 0; argv[argc]; argc++); |
| 6884 | status = func(&result, argc - 2, &argv[2]); |
| 6885 | if(status == OK) |
| 6886 | { |
| 6887 | if (!result) result = US""; |
| 6888 | yield = string_cat(yield, result); |
| 6889 | continue; |
| 6890 | } |
| 6891 | else |
| 6892 | { |
| 6893 | expand_string_message = result ? result : US"(no message)"; |
| 6894 | if (status == FAIL_FORCED) |
| 6895 | f.expand_string_forcedfail = TRUE; |
| 6896 | else if (status != FAIL) |
| 6897 | log_write(0, LOG_MAIN|LOG_PANIC, "dlfunc{%s}{%s} failed (%d): %s", |
| 6898 | argv[0], argv[1], status, expand_string_message); |
| 6899 | goto EXPAND_FAILED; |
| 6900 | } |
| 6901 | } |
| 6902 | #endif /* EXPAND_DLFUNC */ |
| 6903 | |
| 6904 | case EITEM_ENV: /* ${env {name} {val_if_found} {val_if_unfound}} */ |
| 6905 | { |
| 6906 | uschar * key; |
| 6907 | uschar *save_lookup_value = lookup_value; |
| 6908 | |
| 6909 | while (isspace(*s)) s++; |
| 6910 | if (*s != '{') /*}*/ |
| 6911 | goto EXPAND_FAILED; |
| 6912 | |
| 6913 | key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok); |
| 6914 | if (!key) goto EXPAND_FAILED; /*{*/ |
| 6915 | if (*s++ != '}') |
| 6916 | { |
| 6917 | expand_string_message = US"missing '{' for name arg of env"; |
| 6918 | goto EXPAND_FAILED_CURLY; |
| 6919 | } |
| 6920 | |
| 6921 | lookup_value = US getenv(CS key); |
| 6922 | |
| 6923 | switch(process_yesno( |
| 6924 | skipping, /* were previously skipping */ |
| 6925 | lookup_value != NULL, /* success/failure indicator */ |
| 6926 | save_lookup_value, /* value to reset for string2 */ |
| 6927 | &s, /* input pointer */ |
| 6928 | &yield, /* output pointer */ |
| 6929 | US"env", /* condition type */ |
| 6930 | &resetok)) |
| 6931 | { |
| 6932 | case 1: goto EXPAND_FAILED; /* when all is well, the */ |
| 6933 | case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */ |
| 6934 | } |
| 6935 | continue; |
| 6936 | } |
| 6937 | |
| 6938 | #ifdef EXPERIMENTAL_SRS_NATIVE |
| 6939 | case EITEM_SRS_ENCODE: |
| 6940 | /* ${srs_encode {secret} {return_path} {orig_domain}} */ |
| 6941 | { |
| 6942 | uschar * sub[3]; |
| 6943 | uschar cksum[4]; |
| 6944 | |
| 6945 | switch (read_subs(sub, 3, 3, CUSS &s, skipping, TRUE, name, &resetok)) |
| 6946 | { |
| 6947 | case 1: goto EXPAND_FAILED_CURLY; |
| 6948 | case 2: |
| 6949 | case 3: goto EXPAND_FAILED; |
| 6950 | } |
| 6951 | |
| 6952 | yield = string_catn(yield, US"SRS0=", 5); |
| 6953 | |
| 6954 | /* ${l_4:${hmac{md5}{SRS_SECRET}{${lc:$return_path}}}}= */ |
| 6955 | hmac_md5(sub[0], string_copylc(sub[1]), cksum, sizeof(cksum)); |
| 6956 | yield = string_catn(yield, cksum, sizeof(cksum)); |
| 6957 | yield = string_catn(yield, US"=", 1); |
| 6958 | |
| 6959 | /* ${base32:${eval:$tod_epoch/86400&0x3ff}}= */ |
| 6960 | { |
| 6961 | struct timeval now; |
| 6962 | unsigned long i; |
| 6963 | gstring * g = NULL; |
| 6964 | |
| 6965 | gettimeofday(&now, NULL); |
| 6966 | for (unsigned long i = (now.tv_sec / 86400) & 0x3ff; i; i >>= 5) |
| 6967 | g = string_catn(g, &base32_chars[i & 0x1f], 1); |
| 6968 | if (g) while (g->ptr > 0) |
| 6969 | yield = string_catn(yield, &g->s[--g->ptr], 1); |
| 6970 | } |
| 6971 | yield = string_catn(yield, US"=", 1); |
| 6972 | |
| 6973 | /* ${domain:$return_path}=${local_part:$return_path} */ |
| 6974 | { |
| 6975 | int start, end, domain; |
| 6976 | uschar * t = parse_extract_address(sub[1], &expand_string_message, |
| 6977 | &start, &end, &domain, FALSE); |
| 6978 | if (!t) |
| 6979 | goto EXPAND_FAILED; |
| 6980 | |
| 6981 | if (domain > 0) yield = string_cat(yield, t + domain); |
| 6982 | yield = string_catn(yield, US"=", 1); |
| 6983 | yield = domain > 0 |
| 6984 | ? string_catn(yield, t, domain - 1) : string_cat(yield, t); |
| 6985 | } |
| 6986 | |
| 6987 | /* @$original_domain */ |
| 6988 | yield = string_catn(yield, US"@", 1); |
| 6989 | yield = string_cat(yield, sub[2]); |
| 6990 | continue; |
| 6991 | } |
| 6992 | #endif /*EXPERIMENTAL_SRS_NATIVE*/ |
| 6993 | } /* EITEM_* switch */ |
| 6994 | |
| 6995 | /* Control reaches here if the name is not recognized as one of the more |
| 6996 | complicated expansion items. Check for the "operator" syntax (name terminated |
| 6997 | by a colon). Some of the operators have arguments, separated by _ from the |
| 6998 | name. */ |
| 6999 | |
| 7000 | if (*s == ':') |
| 7001 | { |
| 7002 | int c; |
| 7003 | uschar *arg = NULL; |
| 7004 | uschar *sub; |
| 7005 | #ifndef DISABLE_TLS |
| 7006 | var_entry *vp = NULL; |
| 7007 | #endif |
| 7008 | |
| 7009 | /* Owing to an historical mis-design, an underscore may be part of the |
| 7010 | operator name, or it may introduce arguments. We therefore first scan the |
| 7011 | table of names that contain underscores. If there is no match, we cut off |
| 7012 | the arguments and then scan the main table. */ |
| 7013 | |
| 7014 | if ((c = chop_match(name, op_table_underscore, |
| 7015 | nelem(op_table_underscore))) < 0) |
| 7016 | { |
| 7017 | if ((arg = Ustrchr(name, '_'))) |
| 7018 | *arg = 0; |
| 7019 | if ((c = chop_match(name, op_table_main, nelem(op_table_main))) >= 0) |
| 7020 | c += nelem(op_table_underscore); |
| 7021 | if (arg) *arg++ = '_'; /* Put back for error messages */ |
| 7022 | } |
| 7023 | |
| 7024 | /* Deal specially with operators that might take a certificate variable |
| 7025 | as we do not want to do the usual expansion. For most, expand the string.*/ |
| 7026 | switch(c) |
| 7027 | { |
| 7028 | #ifndef DISABLE_TLS |
| 7029 | case EOP_MD5: |
| 7030 | case EOP_SHA1: |
| 7031 | case EOP_SHA256: |
| 7032 | case EOP_BASE64: |
| 7033 | if (s[1] == '$') |
| 7034 | { |
| 7035 | const uschar * s1 = s; |
| 7036 | sub = expand_string_internal(s+2, TRUE, &s1, skipping, |
| 7037 | FALSE, &resetok); |
| 7038 | if (!sub) goto EXPAND_FAILED; /*{*/ |
| 7039 | if (*s1 != '}') |
| 7040 | { |
| 7041 | expand_string_message = |
| 7042 | string_sprintf("missing '}' closing cert arg of %s", name); |
| 7043 | goto EXPAND_FAILED_CURLY; |
| 7044 | } |
| 7045 | if ((vp = find_var_ent(sub)) && vp->type == vtype_cert) |
| 7046 | { |
| 7047 | s = s1+1; |
| 7048 | break; |
| 7049 | } |
| 7050 | vp = NULL; |
| 7051 | } |
| 7052 | /*FALLTHROUGH*/ |
| 7053 | #endif |
| 7054 | default: |
| 7055 | sub = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok); |
| 7056 | if (!sub) goto EXPAND_FAILED; |
| 7057 | s++; |
| 7058 | break; |
| 7059 | } |
| 7060 | |
| 7061 | /* If we are skipping, we don't need to perform the operation at all. |
| 7062 | This matters for operations like "mask", because the data may not be |
| 7063 | in the correct format when skipping. For example, the expression may test |
| 7064 | for the existence of $sender_host_address before trying to mask it. For |
| 7065 | other operations, doing them may not fail, but it is a waste of time. */ |
| 7066 | |
| 7067 | if (skipping && c >= 0) continue; |
| 7068 | |
| 7069 | /* Otherwise, switch on the operator type */ |
| 7070 | |
| 7071 | switch(c) |
| 7072 | { |
| 7073 | case EOP_BASE32: |
| 7074 | { |
| 7075 | uschar *t; |
| 7076 | unsigned long int n = Ustrtoul(sub, &t, 10); |
| 7077 | gstring * g = NULL; |
| 7078 | |
| 7079 | if (*t != 0) |
| 7080 | { |
| 7081 | expand_string_message = string_sprintf("argument for base32 " |
| 7082 | "operator is \"%s\", which is not a decimal number", sub); |
| 7083 | goto EXPAND_FAILED; |
| 7084 | } |
| 7085 | for ( ; n; n >>= 5) |
| 7086 | g = string_catn(g, &base32_chars[n & 0x1f], 1); |
| 7087 | |
| 7088 | if (g) while (g->ptr > 0) yield = string_catn(yield, &g->s[--g->ptr], 1); |
| 7089 | continue; |
| 7090 | } |
| 7091 | |
| 7092 | case EOP_BASE32D: |
| 7093 | { |
| 7094 | uschar *tt = sub; |
| 7095 | unsigned long int n = 0; |
| 7096 | while (*tt) |
| 7097 | { |
| 7098 | uschar * t = Ustrchr(base32_chars, *tt++); |
| 7099 | if (!t) |
| 7100 | { |
| 7101 | expand_string_message = string_sprintf("argument for base32d " |
| 7102 | "operator is \"%s\", which is not a base 32 number", sub); |
| 7103 | goto EXPAND_FAILED; |
| 7104 | } |
| 7105 | n = n * 32 + (t - base32_chars); |
| 7106 | } |
| 7107 | yield = string_fmt_append(yield, "%ld", n); |
| 7108 | continue; |
| 7109 | } |
| 7110 | |
| 7111 | case EOP_BASE62: |
| 7112 | { |
| 7113 | uschar *t; |
| 7114 | unsigned long int n = Ustrtoul(sub, &t, 10); |
| 7115 | if (*t != 0) |
| 7116 | { |
| 7117 | expand_string_message = string_sprintf("argument for base62 " |
| 7118 | "operator is \"%s\", which is not a decimal number", sub); |
| 7119 | goto EXPAND_FAILED; |
| 7120 | } |
| 7121 | yield = string_cat(yield, string_base62(n)); |
| 7122 | continue; |
| 7123 | } |
| 7124 | |
| 7125 | /* Note that for Darwin and Cygwin, BASE_62 actually has the value 36 */ |
| 7126 | |
| 7127 | case EOP_BASE62D: |
| 7128 | { |
| 7129 | uschar *tt = sub; |
| 7130 | unsigned long int n = 0; |
| 7131 | while (*tt != 0) |
| 7132 | { |
| 7133 | uschar *t = Ustrchr(base62_chars, *tt++); |
| 7134 | if (!t) |
| 7135 | { |
| 7136 | expand_string_message = string_sprintf("argument for base62d " |
| 7137 | "operator is \"%s\", which is not a base %d number", sub, |
| 7138 | BASE_62); |
| 7139 | goto EXPAND_FAILED; |
| 7140 | } |
| 7141 | n = n * BASE_62 + (t - base62_chars); |
| 7142 | } |
| 7143 | yield = string_fmt_append(yield, "%ld", n); |
| 7144 | continue; |
| 7145 | } |
| 7146 | |
| 7147 | case EOP_BLESS: |
| 7148 | /* This is purely for the convenience of the test harness. Do not enable |
| 7149 | it otherwise as it defeats the taint-checking security. */ |
| 7150 | |
| 7151 | if (f.running_in_test_harness) |
| 7152 | yield = string_cat(yield, is_tainted(sub) |
| 7153 | ? string_copy_taint(sub, FALSE) : sub); |
| 7154 | else |
| 7155 | { |
| 7156 | DEBUG(D_expand) debug_printf_indent("bless operator not supported\n"); |
| 7157 | yield = string_cat(yield, sub); |
| 7158 | } |
| 7159 | continue; |
| 7160 | |
| 7161 | case EOP_EXPAND: |
| 7162 | { |
| 7163 | uschar *expanded = expand_string_internal(sub, FALSE, NULL, skipping, TRUE, &resetok); |
| 7164 | if (!expanded) |
| 7165 | { |
| 7166 | expand_string_message = |
| 7167 | string_sprintf("internal expansion of \"%s\" failed: %s", sub, |
| 7168 | expand_string_message); |
| 7169 | goto EXPAND_FAILED; |
| 7170 | } |
| 7171 | yield = string_cat(yield, expanded); |
| 7172 | continue; |
| 7173 | } |
| 7174 | |
| 7175 | case EOP_LC: |
| 7176 | { |
| 7177 | int count = 0; |
| 7178 | uschar *t = sub - 1; |
| 7179 | while (*(++t) != 0) { *t = tolower(*t); count++; } |
| 7180 | yield = string_catn(yield, sub, count); |
| 7181 | continue; |
| 7182 | } |
| 7183 | |
| 7184 | case EOP_UC: |
| 7185 | { |
| 7186 | int count = 0; |
| 7187 | uschar *t = sub - 1; |
| 7188 | while (*(++t) != 0) { *t = toupper(*t); count++; } |
| 7189 | yield = string_catn(yield, sub, count); |
| 7190 | continue; |
| 7191 | } |
| 7192 | |
| 7193 | case EOP_MD5: |
| 7194 | #ifndef DISABLE_TLS |
| 7195 | if (vp && *(void **)vp->value) |
| 7196 | { |
| 7197 | uschar * cp = tls_cert_fprt_md5(*(void **)vp->value); |
| 7198 | yield = string_cat(yield, cp); |
| 7199 | } |
| 7200 | else |
| 7201 | #endif |
| 7202 | { |
| 7203 | md5 base; |
| 7204 | uschar digest[16]; |
| 7205 | md5_start(&base); |
| 7206 | md5_end(&base, sub, Ustrlen(sub), digest); |
| 7207 | for (int j = 0; j < 16; j++) |
| 7208 | yield = string_fmt_append(yield, "%02x", digest[j]); |
| 7209 | } |
| 7210 | continue; |
| 7211 | |
| 7212 | case EOP_SHA1: |
| 7213 | #ifndef DISABLE_TLS |
| 7214 | if (vp && *(void **)vp->value) |
| 7215 | { |
| 7216 | uschar * cp = tls_cert_fprt_sha1(*(void **)vp->value); |
| 7217 | yield = string_cat(yield, cp); |
| 7218 | } |
| 7219 | else |
| 7220 | #endif |
| 7221 | { |
| 7222 | hctx h; |
| 7223 | uschar digest[20]; |
| 7224 | sha1_start(&h); |
| 7225 | sha1_end(&h, sub, Ustrlen(sub), digest); |
| 7226 | for (int j = 0; j < 20; j++) |
| 7227 | yield = string_fmt_append(yield, "%02X", digest[j]); |
| 7228 | } |
| 7229 | continue; |
| 7230 | |
| 7231 | case EOP_SHA2: |
| 7232 | case EOP_SHA256: |
| 7233 | #ifdef EXIM_HAVE_SHA2 |
| 7234 | if (vp && *(void **)vp->value) |
| 7235 | if (c == EOP_SHA256) |
| 7236 | yield = string_cat(yield, tls_cert_fprt_sha256(*(void **)vp->value)); |
| 7237 | else |
| 7238 | expand_string_message = US"sha2_N not supported with certificates"; |
| 7239 | else |
| 7240 | { |
| 7241 | hctx h; |
| 7242 | blob b; |
| 7243 | hashmethod m = !arg ? HASH_SHA2_256 |
| 7244 | : Ustrcmp(arg, "256") == 0 ? HASH_SHA2_256 |
| 7245 | : Ustrcmp(arg, "384") == 0 ? HASH_SHA2_384 |
| 7246 | : Ustrcmp(arg, "512") == 0 ? HASH_SHA2_512 |
| 7247 | : HASH_BADTYPE; |
| 7248 | |
| 7249 | if (m == HASH_BADTYPE || !exim_sha_init(&h, m)) |
| 7250 | { |
| 7251 | expand_string_message = US"unrecognised sha2 variant"; |
| 7252 | goto EXPAND_FAILED; |
| 7253 | } |
| 7254 | |
| 7255 | exim_sha_update(&h, sub, Ustrlen(sub)); |
| 7256 | exim_sha_finish(&h, &b); |
| 7257 | while (b.len-- > 0) |
| 7258 | yield = string_fmt_append(yield, "%02X", *b.data++); |
| 7259 | } |
| 7260 | #else |
| 7261 | expand_string_message = US"sha256 only supported with TLS"; |
| 7262 | #endif |
| 7263 | continue; |
| 7264 | |
| 7265 | case EOP_SHA3: |
| 7266 | #ifdef EXIM_HAVE_SHA3 |
| 7267 | { |
| 7268 | hctx h; |
| 7269 | blob b; |
| 7270 | hashmethod m = !arg ? HASH_SHA3_256 |
| 7271 | : Ustrcmp(arg, "224") == 0 ? HASH_SHA3_224 |
| 7272 | : Ustrcmp(arg, "256") == 0 ? HASH_SHA3_256 |
| 7273 | : Ustrcmp(arg, "384") == 0 ? HASH_SHA3_384 |
| 7274 | : Ustrcmp(arg, "512") == 0 ? HASH_SHA3_512 |
| 7275 | : HASH_BADTYPE; |
| 7276 | |
| 7277 | if (m == HASH_BADTYPE || !exim_sha_init(&h, m)) |
| 7278 | { |
| 7279 | expand_string_message = US"unrecognised sha3 variant"; |
| 7280 | goto EXPAND_FAILED; |
| 7281 | } |
| 7282 | |
| 7283 | exim_sha_update(&h, sub, Ustrlen(sub)); |
| 7284 | exim_sha_finish(&h, &b); |
| 7285 | while (b.len-- > 0) |
| 7286 | yield = string_fmt_append(yield, "%02X", *b.data++); |
| 7287 | } |
| 7288 | continue; |
| 7289 | #else |
| 7290 | expand_string_message = US"sha3 only supported with GnuTLS 3.5.0 + or OpenSSL 1.1.1 +"; |
| 7291 | goto EXPAND_FAILED; |
| 7292 | #endif |
| 7293 | |
| 7294 | /* Convert hex encoding to base64 encoding */ |
| 7295 | |
| 7296 | case EOP_HEX2B64: |
| 7297 | { |
| 7298 | int c = 0; |
| 7299 | int b = -1; |
| 7300 | uschar *in = sub; |
| 7301 | uschar *out = sub; |
| 7302 | uschar *enc; |
| 7303 | |
| 7304 | for (enc = sub; *enc; enc++) |
| 7305 | { |
| 7306 | if (!isxdigit(*enc)) |
| 7307 | { |
| 7308 | expand_string_message = string_sprintf("\"%s\" is not a hex " |
| 7309 | "string", sub); |
| 7310 | goto EXPAND_FAILED; |
| 7311 | } |
| 7312 | c++; |
| 7313 | } |
| 7314 | |
| 7315 | if ((c & 1) != 0) |
| 7316 | { |
| 7317 | expand_string_message = string_sprintf("\"%s\" contains an odd " |
| 7318 | "number of characters", sub); |
| 7319 | goto EXPAND_FAILED; |
| 7320 | } |
| 7321 | |
| 7322 | while ((c = *in++) != 0) |
| 7323 | { |
| 7324 | if (isdigit(c)) c -= '0'; |
| 7325 | else c = toupper(c) - 'A' + 10; |
| 7326 | if (b == -1) |
| 7327 | b = c << 4; |
| 7328 | else |
| 7329 | { |
| 7330 | *out++ = b | c; |
| 7331 | b = -1; |
| 7332 | } |
| 7333 | } |
| 7334 | |
| 7335 | enc = b64encode(CUS sub, out - sub); |
| 7336 | yield = string_cat(yield, enc); |
| 7337 | continue; |
| 7338 | } |
| 7339 | |
| 7340 | /* Convert octets outside 0x21..0x7E to \xXX form */ |
| 7341 | |
| 7342 | case EOP_HEXQUOTE: |
| 7343 | { |
| 7344 | uschar *t = sub - 1; |
| 7345 | while (*(++t) != 0) |
| 7346 | { |
| 7347 | if (*t < 0x21 || 0x7E < *t) |
| 7348 | yield = string_fmt_append(yield, "\\x%02x", *t); |
| 7349 | else |
| 7350 | yield = string_catn(yield, t, 1); |
| 7351 | } |
| 7352 | continue; |
| 7353 | } |
| 7354 | |
| 7355 | /* count the number of list elements */ |
| 7356 | |
| 7357 | case EOP_LISTCOUNT: |
| 7358 | { |
| 7359 | int cnt = 0; |
| 7360 | int sep = 0; |
| 7361 | uschar buffer[256]; |
| 7362 | |
| 7363 | while (string_nextinlist(CUSS &sub, &sep, buffer, sizeof(buffer))) cnt++; |
| 7364 | yield = string_fmt_append(yield, "%d", cnt); |
| 7365 | continue; |
| 7366 | } |
| 7367 | |
| 7368 | /* expand a named list given the name */ |
| 7369 | /* handles nested named lists; requotes as colon-sep list */ |
| 7370 | |
| 7371 | case EOP_LISTNAMED: |
| 7372 | { |
| 7373 | tree_node *t = NULL; |
| 7374 | const uschar * list; |
| 7375 | int sep = 0; |
| 7376 | uschar * item; |
| 7377 | uschar * suffix = US""; |
| 7378 | BOOL needsep = FALSE; |
| 7379 | uschar buffer[256]; |
| 7380 | |
| 7381 | if (*sub == '+') sub++; |
| 7382 | if (!arg) /* no-argument version */ |
| 7383 | { |
| 7384 | if (!(t = tree_search(addresslist_anchor, sub)) && |
| 7385 | !(t = tree_search(domainlist_anchor, sub)) && |
| 7386 | !(t = tree_search(hostlist_anchor, sub))) |
| 7387 | t = tree_search(localpartlist_anchor, sub); |
| 7388 | } |
| 7389 | else switch(*arg) /* specific list-type version */ |
| 7390 | { |
| 7391 | case 'a': t = tree_search(addresslist_anchor, sub); suffix = US"_a"; break; |
| 7392 | case 'd': t = tree_search(domainlist_anchor, sub); suffix = US"_d"; break; |
| 7393 | case 'h': t = tree_search(hostlist_anchor, sub); suffix = US"_h"; break; |
| 7394 | case 'l': t = tree_search(localpartlist_anchor, sub); suffix = US"_l"; break; |
| 7395 | default: |
| 7396 | expand_string_message = US"bad suffix on \"list\" operator"; |
| 7397 | goto EXPAND_FAILED; |
| 7398 | } |
| 7399 | |
| 7400 | if(!t) |
| 7401 | { |
| 7402 | expand_string_message = string_sprintf("\"%s\" is not a %snamed list", |
| 7403 | sub, !arg?"" |
| 7404 | : *arg=='a'?"address " |
| 7405 | : *arg=='d'?"domain " |
| 7406 | : *arg=='h'?"host " |
| 7407 | : *arg=='l'?"localpart " |
| 7408 | : 0); |
| 7409 | goto EXPAND_FAILED; |
| 7410 | } |
| 7411 | |
| 7412 | list = ((namedlist_block *)(t->data.ptr))->string; |
| 7413 | |
| 7414 | while ((item = string_nextinlist(&list, &sep, buffer, sizeof(buffer)))) |
| 7415 | { |
| 7416 | uschar * buf = US" : "; |
| 7417 | if (needsep) |
| 7418 | yield = string_catn(yield, buf, 3); |
| 7419 | else |
| 7420 | needsep = TRUE; |
| 7421 | |
| 7422 | if (*item == '+') /* list item is itself a named list */ |
| 7423 | { |
| 7424 | uschar * sub = string_sprintf("${listnamed%s:%s}", suffix, item); |
| 7425 | item = expand_string_internal(sub, FALSE, NULL, FALSE, TRUE, &resetok); |
| 7426 | } |
| 7427 | else if (sep != ':') /* item from non-colon-sep list, re-quote for colon list-separator */ |
| 7428 | { |
| 7429 | char * cp; |
| 7430 | char tok[3]; |
| 7431 | tok[0] = sep; tok[1] = ':'; tok[2] = 0; |
| 7432 | while ((cp= strpbrk(CCS item, tok))) |
| 7433 | { |
| 7434 | yield = string_catn(yield, item, cp - CS item); |
| 7435 | if (*cp++ == ':') /* colon in a non-colon-sep list item, needs doubling */ |
| 7436 | { |
| 7437 | yield = string_catn(yield, US"::", 2); |
| 7438 | item = US cp; |
| 7439 | } |
| 7440 | else /* sep in item; should already be doubled; emit once */ |
| 7441 | { |
| 7442 | yield = string_catn(yield, US tok, 1); |
| 7443 | if (*cp == sep) cp++; |
| 7444 | item = US cp; |
| 7445 | } |
| 7446 | } |
| 7447 | } |
| 7448 | yield = string_cat(yield, item); |
| 7449 | } |
| 7450 | continue; |
| 7451 | } |
| 7452 | |
| 7453 | /* mask applies a mask to an IP address; for example the result of |
| 7454 | ${mask:131.111.10.206/28} is 131.111.10.192/28. */ |
| 7455 | |
| 7456 | case EOP_MASK: |
| 7457 | { |
| 7458 | int count; |
| 7459 | uschar *endptr; |
| 7460 | int binary[4]; |
| 7461 | int mask, maskoffset; |
| 7462 | int type = string_is_ip_address(sub, &maskoffset); |
| 7463 | uschar buffer[64]; |
| 7464 | |
| 7465 | if (type == 0) |
| 7466 | { |
| 7467 | expand_string_message = string_sprintf("\"%s\" is not an IP address", |
| 7468 | sub); |
| 7469 | goto EXPAND_FAILED; |
| 7470 | } |
| 7471 | |
| 7472 | if (maskoffset == 0) |
| 7473 | { |
| 7474 | expand_string_message = string_sprintf("missing mask value in \"%s\"", |
| 7475 | sub); |
| 7476 | goto EXPAND_FAILED; |
| 7477 | } |
| 7478 | |
| 7479 | mask = Ustrtol(sub + maskoffset + 1, &endptr, 10); |
| 7480 | |
| 7481 | if (*endptr != 0 || mask < 0 || mask > ((type == 4)? 32 : 128)) |
| 7482 | { |
| 7483 | expand_string_message = string_sprintf("mask value too big in \"%s\"", |
| 7484 | sub); |
| 7485 | goto EXPAND_FAILED; |
| 7486 | } |
| 7487 | |
| 7488 | /* Convert the address to binary integer(s) and apply the mask */ |
| 7489 | |
| 7490 | sub[maskoffset] = 0; |
| 7491 | count = host_aton(sub, binary); |
| 7492 | host_mask(count, binary, mask); |
| 7493 | |
| 7494 | /* Convert to masked textual format and add to output. */ |
| 7495 | |
| 7496 | yield = string_catn(yield, buffer, |
| 7497 | host_nmtoa(count, binary, mask, buffer, '.')); |
| 7498 | continue; |
| 7499 | } |
| 7500 | |
| 7501 | case EOP_IPV6NORM: |
| 7502 | case EOP_IPV6DENORM: |
| 7503 | { |
| 7504 | int type = string_is_ip_address(sub, NULL); |
| 7505 | int binary[4]; |
| 7506 | uschar buffer[44]; |
| 7507 | |
| 7508 | switch (type) |
| 7509 | { |
| 7510 | case 6: |
| 7511 | (void) host_aton(sub, binary); |
| 7512 | break; |
| 7513 | |
| 7514 | case 4: /* convert to IPv4-mapped IPv6 */ |
| 7515 | binary[0] = binary[1] = 0; |
| 7516 | binary[2] = 0x0000ffff; |
| 7517 | (void) host_aton(sub, binary+3); |
| 7518 | break; |
| 7519 | |
| 7520 | case 0: |
| 7521 | expand_string_message = |
| 7522 | string_sprintf("\"%s\" is not an IP address", sub); |
| 7523 | goto EXPAND_FAILED; |
| 7524 | } |
| 7525 | |
| 7526 | yield = string_catn(yield, buffer, c == EOP_IPV6NORM |
| 7527 | ? ipv6_nmtoa(binary, buffer) |
| 7528 | : host_nmtoa(4, binary, -1, buffer, ':') |
| 7529 | ); |
| 7530 | continue; |
| 7531 | } |
| 7532 | |
| 7533 | case EOP_ADDRESS: |
| 7534 | case EOP_LOCAL_PART: |
| 7535 | case EOP_DOMAIN: |
| 7536 | { |
| 7537 | uschar * error; |
| 7538 | int start, end, domain; |
| 7539 | uschar * t = parse_extract_address(sub, &error, &start, &end, &domain, |
| 7540 | FALSE); |
| 7541 | if (t) |
| 7542 | if (c != EOP_DOMAIN) |
| 7543 | yield = c == EOP_LOCAL_PART && domain > 0 |
| 7544 | ? string_catn(yield, t, domain - 1) |
| 7545 | : string_cat(yield, t); |
| 7546 | else if (domain > 0) |
| 7547 | yield = string_cat(yield, t + domain); |
| 7548 | continue; |
| 7549 | } |
| 7550 | |
| 7551 | case EOP_ADDRESSES: |
| 7552 | { |
| 7553 | uschar outsep[2] = { ':', '\0' }; |
| 7554 | uschar *address, *error; |
| 7555 | int save_ptr = gstring_length(yield); |
| 7556 | int start, end, domain; /* Not really used */ |
| 7557 | |
| 7558 | while (isspace(*sub)) sub++; |
| 7559 | if (*sub == '>') |
| 7560 | if (*outsep = *++sub) ++sub; |
| 7561 | else |
| 7562 | { |
| 7563 | expand_string_message = string_sprintf("output separator " |
| 7564 | "missing in expanding ${addresses:%s}", --sub); |
| 7565 | goto EXPAND_FAILED; |
| 7566 | } |
| 7567 | f.parse_allow_group = TRUE; |
| 7568 | |
| 7569 | for (;;) |
| 7570 | { |
| 7571 | uschar * p = parse_find_address_end(sub, FALSE); |
| 7572 | uschar saveend = *p; |
| 7573 | *p = '\0'; |
| 7574 | address = parse_extract_address(sub, &error, &start, &end, &domain, |
| 7575 | FALSE); |
| 7576 | *p = saveend; |
| 7577 | |
| 7578 | /* Add the address to the output list that we are building. This is |
| 7579 | done in chunks by searching for the separator character. At the |
| 7580 | start, unless we are dealing with the first address of the output |
| 7581 | list, add in a space if the new address begins with the separator |
| 7582 | character, or is an empty string. */ |
| 7583 | |
| 7584 | if (address) |
| 7585 | { |
| 7586 | if (yield && yield->ptr != save_ptr && address[0] == *outsep) |
| 7587 | yield = string_catn(yield, US" ", 1); |
| 7588 | |
| 7589 | for (;;) |
| 7590 | { |
| 7591 | size_t seglen = Ustrcspn(address, outsep); |
| 7592 | yield = string_catn(yield, address, seglen + 1); |
| 7593 | |
| 7594 | /* If we got to the end of the string we output one character |
| 7595 | too many. */ |
| 7596 | |
| 7597 | if (address[seglen] == '\0') { yield->ptr--; break; } |
| 7598 | yield = string_catn(yield, outsep, 1); |
| 7599 | address += seglen + 1; |
| 7600 | } |
| 7601 | |
| 7602 | /* Output a separator after the string: we will remove the |
| 7603 | redundant final one at the end. */ |
| 7604 | |
| 7605 | yield = string_catn(yield, outsep, 1); |
| 7606 | } |
| 7607 | |
| 7608 | if (saveend == '\0') break; |
| 7609 | sub = p + 1; |
| 7610 | } |
| 7611 | |
| 7612 | /* If we have generated anything, remove the redundant final |
| 7613 | separator. */ |
| 7614 | |
| 7615 | if (yield && yield->ptr != save_ptr) yield->ptr--; |
| 7616 | f.parse_allow_group = FALSE; |
| 7617 | continue; |
| 7618 | } |
| 7619 | |
| 7620 | |
| 7621 | /* quote puts a string in quotes if it is empty or contains anything |
| 7622 | other than alphamerics, underscore, dot, or hyphen. |
| 7623 | |
| 7624 | quote_local_part puts a string in quotes if RFC 2821/2822 requires it to |
| 7625 | be quoted in order to be a valid local part. |
| 7626 | |
| 7627 | In both cases, newlines and carriage returns are converted into \n and \r |
| 7628 | respectively */ |
| 7629 | |
| 7630 | case EOP_QUOTE: |
| 7631 | case EOP_QUOTE_LOCAL_PART: |
| 7632 | if (!arg) |
| 7633 | { |
| 7634 | BOOL needs_quote = (!*sub); /* TRUE for empty string */ |
| 7635 | uschar *t = sub - 1; |
| 7636 | |
| 7637 | if (c == EOP_QUOTE) |
| 7638 | { |
| 7639 | while (!needs_quote && *(++t) != 0) |
| 7640 | needs_quote = !isalnum(*t) && !strchr("_-.", *t); |
| 7641 | } |
| 7642 | else /* EOP_QUOTE_LOCAL_PART */ |
| 7643 | { |
| 7644 | while (!needs_quote && *(++t) != 0) |
| 7645 | needs_quote = !isalnum(*t) && |
| 7646 | strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL && |
| 7647 | (*t != '.' || t == sub || t[1] == 0); |
| 7648 | } |
| 7649 | |
| 7650 | if (needs_quote) |
| 7651 | { |
| 7652 | yield = string_catn(yield, US"\"", 1); |
| 7653 | t = sub - 1; |
| 7654 | while (*(++t) != 0) |
| 7655 | { |
| 7656 | if (*t == '\n') |
| 7657 | yield = string_catn(yield, US"\\n", 2); |
| 7658 | else if (*t == '\r') |
| 7659 | yield = string_catn(yield, US"\\r", 2); |
| 7660 | else |
| 7661 | { |
| 7662 | if (*t == '\\' || *t == '"') |
| 7663 | yield = string_catn(yield, US"\\", 1); |
| 7664 | yield = string_catn(yield, t, 1); |
| 7665 | } |
| 7666 | } |
| 7667 | yield = string_catn(yield, US"\"", 1); |
| 7668 | } |
| 7669 | else yield = string_cat(yield, sub); |
| 7670 | continue; |
| 7671 | } |
| 7672 | |
| 7673 | /* quote_lookuptype does lookup-specific quoting */ |
| 7674 | |
| 7675 | else |
| 7676 | { |
| 7677 | int n; |
| 7678 | uschar *opt = Ustrchr(arg, '_'); |
| 7679 | |
| 7680 | if (opt) *opt++ = 0; |
| 7681 | |
| 7682 | if ((n = search_findtype(arg, Ustrlen(arg))) < 0) |
| 7683 | { |
| 7684 | expand_string_message = search_error_message; |
| 7685 | goto EXPAND_FAILED; |
| 7686 | } |
| 7687 | |
| 7688 | if (lookup_list[n]->quote) |
| 7689 | sub = (lookup_list[n]->quote)(sub, opt); |
| 7690 | else if (opt) |
| 7691 | sub = NULL; |
| 7692 | |
| 7693 | if (!sub) |
| 7694 | { |
| 7695 | expand_string_message = string_sprintf( |
| 7696 | "\"%s\" unrecognized after \"${quote_%s\"", |
| 7697 | opt, arg); |
| 7698 | goto EXPAND_FAILED; |
| 7699 | } |
| 7700 | |
| 7701 | yield = string_cat(yield, sub); |
| 7702 | continue; |
| 7703 | } |
| 7704 | |
| 7705 | /* rx quote sticks in \ before any non-alphameric character so that |
| 7706 | the insertion works in a regular expression. */ |
| 7707 | |
| 7708 | case EOP_RXQUOTE: |
| 7709 | { |
| 7710 | uschar *t = sub - 1; |
| 7711 | while (*(++t) != 0) |
| 7712 | { |
| 7713 | if (!isalnum(*t)) |
| 7714 | yield = string_catn(yield, US"\\", 1); |
| 7715 | yield = string_catn(yield, t, 1); |
| 7716 | } |
| 7717 | continue; |
| 7718 | } |
| 7719 | |
| 7720 | /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as |
| 7721 | prescribed by the RFC, if there are characters that need to be encoded */ |
| 7722 | |
| 7723 | case EOP_RFC2047: |
| 7724 | { |
| 7725 | uschar buffer[2048]; |
| 7726 | yield = string_cat(yield, |
| 7727 | parse_quote_2047(sub, Ustrlen(sub), headers_charset, |
| 7728 | buffer, sizeof(buffer), FALSE)); |
| 7729 | continue; |
| 7730 | } |
| 7731 | |
| 7732 | /* RFC 2047 decode */ |
| 7733 | |
| 7734 | case EOP_RFC2047D: |
| 7735 | { |
| 7736 | int len; |
| 7737 | uschar *error; |
| 7738 | uschar *decoded = rfc2047_decode(sub, check_rfc2047_length, |
| 7739 | headers_charset, '?', &len, &error); |
| 7740 | if (error) |
| 7741 | { |
| 7742 | expand_string_message = error; |
| 7743 | goto EXPAND_FAILED; |
| 7744 | } |
| 7745 | yield = string_catn(yield, decoded, len); |
| 7746 | continue; |
| 7747 | } |
| 7748 | |
| 7749 | /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into |
| 7750 | underscores */ |
| 7751 | |
| 7752 | case EOP_FROM_UTF8: |
| 7753 | { |
| 7754 | uschar * buff = store_get(4, is_tainted(sub)); |
| 7755 | while (*sub) |
| 7756 | { |
| 7757 | int c; |
| 7758 | GETUTF8INC(c, sub); |
| 7759 | if (c > 255) c = '_'; |
| 7760 | buff[0] = c; |
| 7761 | yield = string_catn(yield, buff, 1); |
| 7762 | } |
| 7763 | continue; |
| 7764 | } |
| 7765 | |
| 7766 | /* replace illegal UTF-8 sequences by replacement character */ |
| 7767 | |
| 7768 | #define UTF8_REPLACEMENT_CHAR US"?" |
| 7769 | |
| 7770 | case EOP_UTF8CLEAN: |
| 7771 | { |
| 7772 | int seq_len = 0, index = 0; |
| 7773 | int bytes_left = 0; |
| 7774 | long codepoint = -1; |
| 7775 | int complete; |
| 7776 | uschar seq_buff[4]; /* accumulate utf-8 here */ |
| 7777 | |
| 7778 | /* Manually track tainting, as we deal in individual chars below */ |
| 7779 | |
| 7780 | if (is_tainted(sub)) |
| 7781 | if (yield->s && yield->ptr) |
| 7782 | gstring_rebuffer(yield); |
| 7783 | else |
| 7784 | yield->s = store_get(yield->size = Ustrlen(sub), TRUE); |
| 7785 | |
| 7786 | /* Check the UTF-8, byte-by-byte */ |
| 7787 | |
| 7788 | while (*sub) |
| 7789 | { |
| 7790 | complete = 0; |
| 7791 | uschar c = *sub++; |
| 7792 | |
| 7793 | if (bytes_left) |
| 7794 | { |
| 7795 | if ((c & 0xc0) != 0x80) |
| 7796 | /* wrong continuation byte; invalidate all bytes */ |
| 7797 | complete = 1; /* error */ |
| 7798 | else |
| 7799 | { |
| 7800 | codepoint = (codepoint << 6) | (c & 0x3f); |
| 7801 | seq_buff[index++] = c; |
| 7802 | if (--bytes_left == 0) /* codepoint complete */ |
| 7803 | if(codepoint > 0x10FFFF) /* is it too large? */ |
| 7804 | complete = -1; /* error (RFC3629 limit) */ |
| 7805 | else |
| 7806 | { /* finished; output utf-8 sequence */ |
| 7807 | yield = string_catn(yield, seq_buff, seq_len); |
| 7808 | index = 0; |
| 7809 | } |
| 7810 | } |
| 7811 | } |
| 7812 | else /* no bytes left: new sequence */ |
| 7813 | { |
| 7814 | if(!(c & 0x80)) /* 1-byte sequence, US-ASCII, keep it */ |
| 7815 | { |
| 7816 | yield = string_catn(yield, &c, 1); |
| 7817 | continue; |
| 7818 | } |
| 7819 | if((c & 0xe0) == 0xc0) /* 2-byte sequence */ |
| 7820 | { |
| 7821 | if(c == 0xc0 || c == 0xc1) /* 0xc0 and 0xc1 are illegal */ |
| 7822 | complete = -1; |
| 7823 | else |
| 7824 | { |
| 7825 | bytes_left = 1; |
| 7826 | codepoint = c & 0x1f; |
| 7827 | } |
| 7828 | } |
| 7829 | else if((c & 0xf0) == 0xe0) /* 3-byte sequence */ |
| 7830 | { |
| 7831 | bytes_left = 2; |
| 7832 | codepoint = c & 0x0f; |
| 7833 | } |
| 7834 | else if((c & 0xf8) == 0xf0) /* 4-byte sequence */ |
| 7835 | { |
| 7836 | bytes_left = 3; |
| 7837 | codepoint = c & 0x07; |
| 7838 | } |
| 7839 | else /* invalid or too long (RFC3629 allows only 4 bytes) */ |
| 7840 | complete = -1; |
| 7841 | |
| 7842 | seq_buff[index++] = c; |
| 7843 | seq_len = bytes_left + 1; |
| 7844 | } /* if(bytes_left) */ |
| 7845 | |
| 7846 | if (complete != 0) |
| 7847 | { |
| 7848 | bytes_left = index = 0; |
| 7849 | yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1); |
| 7850 | } |
| 7851 | if ((complete == 1) && ((c & 0x80) == 0)) |
| 7852 | /* ASCII character follows incomplete sequence */ |
| 7853 | yield = string_catn(yield, &c, 1); |
| 7854 | } |
| 7855 | /* If given a sequence truncated mid-character, we also want to report ? |
| 7856 | * Eg, ${length_1:フィル} is one byte, not one character, so we expect |
| 7857 | * ${utf8clean:${length_1:フィル}} to yield '?' */ |
| 7858 | if (bytes_left != 0) |
| 7859 | yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1); |
| 7860 | |
| 7861 | continue; |
| 7862 | } |
| 7863 | |
| 7864 | #ifdef SUPPORT_I18N |
| 7865 | case EOP_UTF8_DOMAIN_TO_ALABEL: |
| 7866 | { |
| 7867 | uschar * error = NULL; |
| 7868 | uschar * s = string_domain_utf8_to_alabel(sub, &error); |
| 7869 | if (error) |
| 7870 | { |
| 7871 | expand_string_message = string_sprintf( |
| 7872 | "error converting utf8 (%s) to alabel: %s", |
| 7873 | string_printing(sub), error); |
| 7874 | goto EXPAND_FAILED; |
| 7875 | } |
| 7876 | yield = string_cat(yield, s); |
| 7877 | continue; |
| 7878 | } |
| 7879 | |
| 7880 | case EOP_UTF8_DOMAIN_FROM_ALABEL: |
| 7881 | { |
| 7882 | uschar * error = NULL; |
| 7883 | uschar * s = string_domain_alabel_to_utf8(sub, &error); |
| 7884 | if (error) |
| 7885 | { |
| 7886 | expand_string_message = string_sprintf( |
| 7887 | "error converting alabel (%s) to utf8: %s", |
| 7888 | string_printing(sub), error); |
| 7889 | goto EXPAND_FAILED; |
| 7890 | } |
| 7891 | yield = string_cat(yield, s); |
| 7892 | continue; |
| 7893 | } |
| 7894 | |
| 7895 | case EOP_UTF8_LOCALPART_TO_ALABEL: |
| 7896 | { |
| 7897 | uschar * error = NULL; |
| 7898 | uschar * s = string_localpart_utf8_to_alabel(sub, &error); |
| 7899 | if (error) |
| 7900 | { |
| 7901 | expand_string_message = string_sprintf( |
| 7902 | "error converting utf8 (%s) to alabel: %s", |
| 7903 | string_printing(sub), error); |
| 7904 | goto EXPAND_FAILED; |
| 7905 | } |
| 7906 | yield = string_cat(yield, s); |
| 7907 | DEBUG(D_expand) debug_printf_indent("yield: '%s'\n", yield->s); |
| 7908 | continue; |
| 7909 | } |
| 7910 | |
| 7911 | case EOP_UTF8_LOCALPART_FROM_ALABEL: |
| 7912 | { |
| 7913 | uschar * error = NULL; |
| 7914 | uschar * s = string_localpart_alabel_to_utf8(sub, &error); |
| 7915 | if (error) |
| 7916 | { |
| 7917 | expand_string_message = string_sprintf( |
| 7918 | "error converting alabel (%s) to utf8: %s", |
| 7919 | string_printing(sub), error); |
| 7920 | goto EXPAND_FAILED; |
| 7921 | } |
| 7922 | yield = string_cat(yield, s); |
| 7923 | continue; |
| 7924 | } |
| 7925 | #endif /* EXPERIMENTAL_INTERNATIONAL */ |
| 7926 | |
| 7927 | /* escape turns all non-printing characters into escape sequences. */ |
| 7928 | |
| 7929 | case EOP_ESCAPE: |
| 7930 | { |
| 7931 | const uschar * t = string_printing(sub); |
| 7932 | yield = string_cat(yield, t); |
| 7933 | continue; |
| 7934 | } |
| 7935 | |
| 7936 | case EOP_ESCAPE8BIT: |
| 7937 | { |
| 7938 | uschar c; |
| 7939 | |
| 7940 | for (const uschar * s = sub; (c = *s); s++) |
| 7941 | yield = c < 127 && c != '\\' |
| 7942 | ? string_catn(yield, s, 1) |
| 7943 | : string_fmt_append(yield, "\\%03o", c); |
| 7944 | continue; |
| 7945 | } |
| 7946 | |
| 7947 | /* Handle numeric expression evaluation */ |
| 7948 | |
| 7949 | case EOP_EVAL: |
| 7950 | case EOP_EVAL10: |
| 7951 | { |
| 7952 | uschar *save_sub = sub; |
| 7953 | uschar *error = NULL; |
| 7954 | int_eximarith_t n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE); |
| 7955 | if (error) |
| 7956 | { |
| 7957 | expand_string_message = string_sprintf("error in expression " |
| 7958 | "evaluation: %s (after processing \"%.*s\")", error, |
| 7959 | (int)(sub-save_sub), save_sub); |
| 7960 | goto EXPAND_FAILED; |
| 7961 | } |
| 7962 | yield = string_fmt_append(yield, PR_EXIM_ARITH, n); |
| 7963 | continue; |
| 7964 | } |
| 7965 | |
| 7966 | /* Handle time period formatting */ |
| 7967 | |
| 7968 | case EOP_TIME_EVAL: |
| 7969 | { |
| 7970 | int n = readconf_readtime(sub, 0, FALSE); |
| 7971 | if (n < 0) |
| 7972 | { |
| 7973 | expand_string_message = string_sprintf("string \"%s\" is not an " |
| 7974 | "Exim time interval in \"%s\" operator", sub, name); |
| 7975 | goto EXPAND_FAILED; |
| 7976 | } |
| 7977 | yield = string_fmt_append(yield, "%d", n); |
| 7978 | continue; |
| 7979 | } |
| 7980 | |
| 7981 | case EOP_TIME_INTERVAL: |
| 7982 | { |
| 7983 | int n; |
| 7984 | uschar *t = read_number(&n, sub); |
| 7985 | if (*t != 0) /* Not A Number*/ |
| 7986 | { |
| 7987 | expand_string_message = string_sprintf("string \"%s\" is not a " |
| 7988 | "positive number in \"%s\" operator", sub, name); |
| 7989 | goto EXPAND_FAILED; |
| 7990 | } |
| 7991 | t = readconf_printtime(n); |
| 7992 | yield = string_cat(yield, t); |
| 7993 | continue; |
| 7994 | } |
| 7995 | |
| 7996 | /* Convert string to base64 encoding */ |
| 7997 | |
| 7998 | case EOP_STR2B64: |
| 7999 | case EOP_BASE64: |
| 8000 | { |
| 8001 | #ifndef DISABLE_TLS |
| 8002 | uschar * s = vp && *(void **)vp->value |
| 8003 | ? tls_cert_der_b64(*(void **)vp->value) |
| 8004 | : b64encode(CUS sub, Ustrlen(sub)); |
| 8005 | #else |
| 8006 | uschar * s = b64encode(CUS sub, Ustrlen(sub)); |
| 8007 | #endif |
| 8008 | yield = string_cat(yield, s); |
| 8009 | continue; |
| 8010 | } |
| 8011 | |
| 8012 | case EOP_BASE64D: |
| 8013 | { |
| 8014 | uschar * s; |
| 8015 | int len = b64decode(sub, &s); |
| 8016 | if (len < 0) |
| 8017 | { |
| 8018 | expand_string_message = string_sprintf("string \"%s\" is not " |
| 8019 | "well-formed for \"%s\" operator", sub, name); |
| 8020 | goto EXPAND_FAILED; |
| 8021 | } |
| 8022 | yield = string_cat(yield, s); |
| 8023 | continue; |
| 8024 | } |
| 8025 | |
| 8026 | /* strlen returns the length of the string */ |
| 8027 | |
| 8028 | case EOP_STRLEN: |
| 8029 | yield = string_fmt_append(yield, "%d", Ustrlen(sub)); |
| 8030 | continue; |
| 8031 | |
| 8032 | /* length_n or l_n takes just the first n characters or the whole string, |
| 8033 | whichever is the shorter; |
| 8034 | |
| 8035 | substr_m_n, and s_m_n take n characters from offset m; negative m take |
| 8036 | from the end; l_n is synonymous with s_0_n. If n is omitted in substr it |
| 8037 | takes the rest, either to the right or to the left. |
| 8038 | |
| 8039 | hash_n or h_n makes a hash of length n from the string, yielding n |
| 8040 | characters from the set a-z; hash_n_m makes a hash of length n, but |
| 8041 | uses m characters from the set a-zA-Z0-9. |
| 8042 | |
| 8043 | nhash_n returns a single number between 0 and n-1 (in text form), while |
| 8044 | nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies |
| 8045 | between 0 and n-1 and the second between 0 and m-1. */ |
| 8046 | |
| 8047 | case EOP_LENGTH: |
| 8048 | case EOP_L: |
| 8049 | case EOP_SUBSTR: |
| 8050 | case EOP_S: |
| 8051 | case EOP_HASH: |
| 8052 | case EOP_H: |
| 8053 | case EOP_NHASH: |
| 8054 | case EOP_NH: |
| 8055 | { |
| 8056 | int sign = 1; |
| 8057 | int value1 = 0; |
| 8058 | int value2 = -1; |
| 8059 | int *pn; |
| 8060 | int len; |
| 8061 | uschar *ret; |
| 8062 | |
| 8063 | if (!arg) |
| 8064 | { |
| 8065 | expand_string_message = string_sprintf("missing values after %s", |
| 8066 | name); |
| 8067 | goto EXPAND_FAILED; |
| 8068 | } |
| 8069 | |
| 8070 | /* "length" has only one argument, effectively being synonymous with |
| 8071 | substr_0_n. */ |
| 8072 | |
| 8073 | if (c == EOP_LENGTH || c == EOP_L) |
| 8074 | { |
| 8075 | pn = &value2; |
| 8076 | value2 = 0; |
| 8077 | } |
| 8078 | |
| 8079 | /* The others have one or two arguments; for "substr" the first may be |
| 8080 | negative. The second being negative means "not supplied". */ |
| 8081 | |
| 8082 | else |
| 8083 | { |
| 8084 | pn = &value1; |
| 8085 | if (name[0] == 's' && *arg == '-') { sign = -1; arg++; } |
| 8086 | } |
| 8087 | |
| 8088 | /* Read up to two numbers, separated by underscores */ |
| 8089 | |
| 8090 | ret = arg; |
| 8091 | while (*arg != 0) |
| 8092 | { |
| 8093 | if (arg != ret && *arg == '_' && pn == &value1) |
| 8094 | { |
| 8095 | pn = &value2; |
| 8096 | value2 = 0; |
| 8097 | if (arg[1] != 0) arg++; |
| 8098 | } |
| 8099 | else if (!isdigit(*arg)) |
| 8100 | { |
| 8101 | expand_string_message = |
| 8102 | string_sprintf("non-digit after underscore in \"%s\"", name); |
| 8103 | goto EXPAND_FAILED; |
| 8104 | } |
| 8105 | else *pn = (*pn)*10 + *arg++ - '0'; |
| 8106 | } |
| 8107 | value1 *= sign; |
| 8108 | |
| 8109 | /* Perform the required operation */ |
| 8110 | |
| 8111 | ret = c == EOP_HASH || c == EOP_H |
| 8112 | ? compute_hash(sub, value1, value2, &len) |
| 8113 | : c == EOP_NHASH || c == EOP_NH |
| 8114 | ? compute_nhash(sub, value1, value2, &len) |
| 8115 | : extract_substr(sub, value1, value2, &len); |
| 8116 | if (!ret) goto EXPAND_FAILED; |
| 8117 | |
| 8118 | yield = string_catn(yield, ret, len); |
| 8119 | continue; |
| 8120 | } |
| 8121 | |
| 8122 | /* Stat a path */ |
| 8123 | |
| 8124 | case EOP_STAT: |
| 8125 | { |
| 8126 | uschar smode[12]; |
| 8127 | uschar **modetable[3]; |
| 8128 | mode_t mode; |
| 8129 | struct stat st; |
| 8130 | |
| 8131 | if (expand_forbid & RDO_EXISTS) |
| 8132 | { |
| 8133 | expand_string_message = US"Use of the stat() expansion is not permitted"; |
| 8134 | goto EXPAND_FAILED; |
| 8135 | } |
| 8136 | |
| 8137 | if (stat(CS sub, &st) < 0) |
| 8138 | { |
| 8139 | expand_string_message = string_sprintf("stat(%s) failed: %s", |
| 8140 | sub, strerror(errno)); |
| 8141 | goto EXPAND_FAILED; |
| 8142 | } |
| 8143 | mode = st.st_mode; |
| 8144 | switch (mode & S_IFMT) |
| 8145 | { |
| 8146 | case S_IFIFO: smode[0] = 'p'; break; |
| 8147 | case S_IFCHR: smode[0] = 'c'; break; |
| 8148 | case S_IFDIR: smode[0] = 'd'; break; |
| 8149 | case S_IFBLK: smode[0] = 'b'; break; |
| 8150 | case S_IFREG: smode[0] = '-'; break; |
| 8151 | default: smode[0] = '?'; break; |
| 8152 | } |
| 8153 | |
| 8154 | modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky; |
| 8155 | modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid; |
| 8156 | modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid; |
| 8157 | |
| 8158 | for (int i = 0; i < 3; i++) |
| 8159 | { |
| 8160 | memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3); |
| 8161 | mode >>= 3; |
| 8162 | } |
| 8163 | |
| 8164 | smode[10] = 0; |
| 8165 | yield = string_fmt_append(yield, |
| 8166 | "mode=%04lo smode=%s inode=%ld device=%ld links=%ld " |
| 8167 | "uid=%ld gid=%ld size=" OFF_T_FMT " atime=%ld mtime=%ld ctime=%ld", |
| 8168 | (long)(st.st_mode & 077777), smode, (long)st.st_ino, |
| 8169 | (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid, |
| 8170 | (long)st.st_gid, st.st_size, (long)st.st_atime, |
| 8171 | (long)st.st_mtime, (long)st.st_ctime); |
| 8172 | continue; |
| 8173 | } |
| 8174 | |
| 8175 | /* vaguely random number less than N */ |
| 8176 | |
| 8177 | case EOP_RANDINT: |
| 8178 | { |
| 8179 | int_eximarith_t max = expanded_string_integer(sub, TRUE); |
| 8180 | |
| 8181 | if (expand_string_message) |
| 8182 | goto EXPAND_FAILED; |
| 8183 | yield = string_fmt_append(yield, "%d", vaguely_random_number((int)max)); |
| 8184 | continue; |
| 8185 | } |
| 8186 | |
| 8187 | /* Reverse IP, including IPv6 to dotted-nibble */ |
| 8188 | |
| 8189 | case EOP_REVERSE_IP: |
| 8190 | { |
| 8191 | int family, maskptr; |
| 8192 | uschar reversed[128]; |
| 8193 | |
| 8194 | family = string_is_ip_address(sub, &maskptr); |
| 8195 | if (family == 0) |
| 8196 | { |
| 8197 | expand_string_message = string_sprintf( |
| 8198 | "reverse_ip() not given an IP address [%s]", sub); |
| 8199 | goto EXPAND_FAILED; |
| 8200 | } |
| 8201 | invert_address(reversed, sub); |
| 8202 | yield = string_cat(yield, reversed); |
| 8203 | continue; |
| 8204 | } |
| 8205 | |
| 8206 | /* Unknown operator */ |
| 8207 | |
| 8208 | default: |
| 8209 | expand_string_message = |
| 8210 | string_sprintf("unknown expansion operator \"%s\"", name); |
| 8211 | goto EXPAND_FAILED; |
| 8212 | } |
| 8213 | } |
| 8214 | |
| 8215 | /* Handle a plain name. If this is the first thing in the expansion, release |
| 8216 | the pre-allocated buffer. If the result data is known to be in a new buffer, |
| 8217 | newsize will be set to the size of that buffer, and we can just point at that |
| 8218 | store instead of copying. Many expansion strings contain just one reference, |
| 8219 | so this is a useful optimization, especially for humungous headers |
| 8220 | ($message_headers). */ |
| 8221 | /*{*/ |
| 8222 | if (*s++ == '}') |
| 8223 | { |
| 8224 | int len; |
| 8225 | int newsize = 0; |
| 8226 | gstring * g = NULL; |
| 8227 | |
| 8228 | if (!yield) |
| 8229 | g = store_get(sizeof(gstring), FALSE); |
| 8230 | else if (yield->ptr == 0) |
| 8231 | { |
| 8232 | if (resetok) reset_point = store_reset(reset_point); |
| 8233 | yield = NULL; |
| 8234 | reset_point = store_mark(); |
| 8235 | g = store_get(sizeof(gstring), FALSE); /* alloc _before_ calling find_variable() */ |
| 8236 | } |
| 8237 | if (!(value = find_variable(name, FALSE, skipping, &newsize))) |
| 8238 | { |
| 8239 | expand_string_message = |
| 8240 | string_sprintf("unknown variable in \"${%s}\"", name); |
| 8241 | check_variable_error_message(name); |
| 8242 | goto EXPAND_FAILED; |
| 8243 | } |
| 8244 | len = Ustrlen(value); |
| 8245 | if (!yield && newsize) |
| 8246 | { |
| 8247 | yield = g; |
| 8248 | yield->size = newsize; |
| 8249 | yield->ptr = len; |
| 8250 | yield->s = value; |
| 8251 | } |
| 8252 | else |
| 8253 | yield = string_catn(yield, value, len); |
| 8254 | continue; |
| 8255 | } |
| 8256 | |
| 8257 | /* Else there's something wrong */ |
| 8258 | |
| 8259 | expand_string_message = |
| 8260 | string_sprintf("\"${%s\" is not a known operator (or a } is missing " |
| 8261 | "in a variable reference)", name); |
| 8262 | goto EXPAND_FAILED; |
| 8263 | } |
| 8264 | |
| 8265 | /* If we hit the end of the string when ket_ends is set, there is a missing |
| 8266 | terminating brace. */ |
| 8267 | |
| 8268 | if (ket_ends && *s == 0) |
| 8269 | { |
| 8270 | expand_string_message = malformed_header |
| 8271 | ? US"missing } at end of string - could be header name not terminated by colon" |
| 8272 | : US"missing } at end of string"; |
| 8273 | goto EXPAND_FAILED; |
| 8274 | } |
| 8275 | |
| 8276 | /* Expansion succeeded; yield may still be NULL here if nothing was actually |
| 8277 | added to the string. If so, set up an empty string. Add a terminating zero. If |
| 8278 | left != NULL, return a pointer to the terminator. */ |
| 8279 | |
| 8280 | if (!yield) |
| 8281 | yield = string_get(1); |
| 8282 | (void) string_from_gstring(yield); |
| 8283 | if (left) *left = s; |
| 8284 | |
| 8285 | /* Any stacking store that was used above the final string is no longer needed. |
| 8286 | In many cases the final string will be the first one that was got and so there |
| 8287 | will be optimal store usage. */ |
| 8288 | |
| 8289 | if (resetok) gstring_release_unused(yield); |
| 8290 | else if (resetok_p) *resetok_p = FALSE; |
| 8291 | |
| 8292 | DEBUG(D_expand) |
| 8293 | { |
| 8294 | BOOL tainted = is_tainted(yield->s); |
| 8295 | DEBUG(D_noutf8) |
| 8296 | { |
| 8297 | debug_printf_indent("|--expanding: %.*s\n", (int)(s - string), string); |
| 8298 | debug_printf_indent("%sresult: %s\n", |
| 8299 | skipping ? "|-----" : "\\_____", yield->s); |
| 8300 | if (tainted) |
| 8301 | debug_printf_indent("%s \\__(tainted)\n", |
| 8302 | skipping ? "| " : " "); |
| 8303 | if (skipping) |
| 8304 | debug_printf_indent("\\___skipping: result is not used\n"); |
| 8305 | } |
| 8306 | else |
| 8307 | { |
| 8308 | debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ |
| 8309 | "expanding: %.*s\n", |
| 8310 | (int)(s - string), string); |
| 8311 | debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ |
| 8312 | "result: %s\n", |
| 8313 | skipping ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT, |
| 8314 | yield->s); |
| 8315 | if (tainted) |
| 8316 | debug_printf_indent("%s(tainted)\n", |
| 8317 | skipping |
| 8318 | ? UTF8_VERT " " : " " UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ); |
| 8319 | if (skipping) |
| 8320 | debug_printf_indent(UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ |
| 8321 | "skipping: result is not used\n"); |
| 8322 | } |
| 8323 | } |
| 8324 | expand_level--; |
| 8325 | return yield->s; |
| 8326 | |
| 8327 | /* This is the failure exit: easiest to program with a goto. We still need |
| 8328 | to update the pointer to the terminator, for cases of nested calls with "fail". |
| 8329 | */ |
| 8330 | |
| 8331 | EXPAND_FAILED_CURLY: |
| 8332 | if (malformed_header) |
| 8333 | expand_string_message = |
| 8334 | US"missing or misplaced { or } - could be header name not terminated by colon"; |
| 8335 | |
| 8336 | else if (!expand_string_message || !*expand_string_message) |
| 8337 | expand_string_message = US"missing or misplaced { or }"; |
| 8338 | |
| 8339 | /* At one point, Exim reset the store to yield (if yield was not NULL), but |
| 8340 | that is a bad idea, because expand_string_message is in dynamic store. */ |
| 8341 | |
| 8342 | EXPAND_FAILED: |
| 8343 | if (left) *left = s; |
| 8344 | DEBUG(D_expand) |
| 8345 | DEBUG(D_noutf8) |
| 8346 | { |
| 8347 | debug_printf_indent("|failed to expand: %s\n", string); |
| 8348 | debug_printf_indent("%serror message: %s\n", |
| 8349 | f.expand_string_forcedfail ? "|---" : "\\___", expand_string_message); |
| 8350 | if (f.expand_string_forcedfail) |
| 8351 | debug_printf_indent("\\failure was forced\n"); |
| 8352 | } |
| 8353 | else |
| 8354 | { |
| 8355 | debug_printf_indent(UTF8_VERT_RIGHT "failed to expand: %s\n", |
| 8356 | string); |
| 8357 | debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ |
| 8358 | "error message: %s\n", |
| 8359 | f.expand_string_forcedfail ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT, |
| 8360 | expand_string_message); |
| 8361 | if (f.expand_string_forcedfail) |
| 8362 | debug_printf_indent(UTF8_UP_RIGHT "failure was forced\n"); |
| 8363 | } |
| 8364 | if (resetok_p && !resetok) *resetok_p = FALSE; |
| 8365 | expand_level--; |
| 8366 | return NULL; |
| 8367 | } |
| 8368 | |
| 8369 | |
| 8370 | /* This is the external function call. Do a quick check for any expansion |
| 8371 | metacharacters, and if there are none, just return the input string. |
| 8372 | |
| 8373 | Argument: the string to be expanded |
| 8374 | Returns: the expanded string, or NULL if expansion failed; if failure was |
| 8375 | due to a lookup deferring, search_find_defer will be TRUE |
| 8376 | */ |
| 8377 | |
| 8378 | const uschar * |
| 8379 | expand_cstring(const uschar * string) |
| 8380 | { |
| 8381 | if (Ustrpbrk(string, "$\\") != NULL) |
| 8382 | { |
| 8383 | int old_pool = store_pool; |
| 8384 | uschar * s; |
| 8385 | |
| 8386 | f.search_find_defer = FALSE; |
| 8387 | malformed_header = FALSE; |
| 8388 | store_pool = POOL_MAIN; |
| 8389 | s = expand_string_internal(string, FALSE, NULL, FALSE, TRUE, NULL); |
| 8390 | store_pool = old_pool; |
| 8391 | return s; |
| 8392 | } |
| 8393 | return string; |
| 8394 | } |
| 8395 | |
| 8396 | |
| 8397 | uschar * |
| 8398 | expand_string(uschar * string) |
| 8399 | { |
| 8400 | return US expand_cstring(CUS string); |
| 8401 | } |
| 8402 | |
| 8403 | |
| 8404 | |
| 8405 | |
| 8406 | |
| 8407 | /************************************************* |
| 8408 | * Expand and copy * |
| 8409 | *************************************************/ |
| 8410 | |
| 8411 | /* Now and again we want to expand a string and be sure that the result is in a |
| 8412 | new bit of store. This function does that. |
| 8413 | Since we know it has been copied, the de-const cast is safe. |
| 8414 | |
| 8415 | Argument: the string to be expanded |
| 8416 | Returns: the expanded string, always in a new bit of store, or NULL |
| 8417 | */ |
| 8418 | |
| 8419 | uschar * |
| 8420 | expand_string_copy(const uschar *string) |
| 8421 | { |
| 8422 | const uschar *yield = expand_cstring(string); |
| 8423 | if (yield == string) yield = string_copy(string); |
| 8424 | return US yield; |
| 8425 | } |
| 8426 | |
| 8427 | |
| 8428 | |
| 8429 | /************************************************* |
| 8430 | * Expand and interpret as an integer * |
| 8431 | *************************************************/ |
| 8432 | |
| 8433 | /* Expand a string, and convert the result into an integer. |
| 8434 | |
| 8435 | Arguments: |
| 8436 | string the string to be expanded |
| 8437 | isplus TRUE if a non-negative number is expected |
| 8438 | |
| 8439 | Returns: the integer value, or |
| 8440 | -1 for an expansion error ) in both cases, message in |
| 8441 | -2 for an integer interpretation error ) expand_string_message |
| 8442 | expand_string_message is set NULL for an OK integer |
| 8443 | */ |
| 8444 | |
| 8445 | int_eximarith_t |
| 8446 | expand_string_integer(uschar *string, BOOL isplus) |
| 8447 | { |
| 8448 | return expanded_string_integer(expand_string(string), isplus); |
| 8449 | } |
| 8450 | |
| 8451 | |
| 8452 | /************************************************* |
| 8453 | * Interpret string as an integer * |
| 8454 | *************************************************/ |
| 8455 | |
| 8456 | /* Convert a string (that has already been expanded) into an integer. |
| 8457 | |
| 8458 | This function is used inside the expansion code. |
| 8459 | |
| 8460 | Arguments: |
| 8461 | s the string to be expanded |
| 8462 | isplus TRUE if a non-negative number is expected |
| 8463 | |
| 8464 | Returns: the integer value, or |
| 8465 | -1 if string is NULL (which implies an expansion error) |
| 8466 | -2 for an integer interpretation error |
| 8467 | expand_string_message is set NULL for an OK integer |
| 8468 | */ |
| 8469 | |
| 8470 | static int_eximarith_t |
| 8471 | expanded_string_integer(const uschar *s, BOOL isplus) |
| 8472 | { |
| 8473 | int_eximarith_t value; |
| 8474 | uschar *msg = US"invalid integer \"%s\""; |
| 8475 | uschar *endptr; |
| 8476 | |
| 8477 | /* If expansion failed, expand_string_message will be set. */ |
| 8478 | |
| 8479 | if (!s) return -1; |
| 8480 | |
| 8481 | /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno |
| 8482 | to ERANGE. When there isn't an overflow, errno is not changed, at least on some |
| 8483 | systems, so we set it zero ourselves. */ |
| 8484 | |
| 8485 | errno = 0; |
| 8486 | expand_string_message = NULL; /* Indicates no error */ |
| 8487 | |
| 8488 | /* Before Exim 4.64, strings consisting entirely of whitespace compared |
| 8489 | equal to 0. Unfortunately, people actually relied upon that, so preserve |
| 8490 | the behaviour explicitly. Stripping leading whitespace is a harmless |
| 8491 | noop change since strtol skips it anyway (provided that there is a number |
| 8492 | to find at all). */ |
| 8493 | if (isspace(*s)) |
| 8494 | { |
| 8495 | while (isspace(*s)) ++s; |
| 8496 | if (*s == '\0') |
| 8497 | { |
| 8498 | DEBUG(D_expand) |
| 8499 | debug_printf_indent("treating blank string as number 0\n"); |
| 8500 | return 0; |
| 8501 | } |
| 8502 | } |
| 8503 | |
| 8504 | value = strtoll(CS s, CSS &endptr, 10); |
| 8505 | |
| 8506 | if (endptr == s) |
| 8507 | { |
| 8508 | msg = US"integer expected but \"%s\" found"; |
| 8509 | } |
| 8510 | else if (value < 0 && isplus) |
| 8511 | { |
| 8512 | msg = US"non-negative integer expected but \"%s\" found"; |
| 8513 | } |
| 8514 | else |
| 8515 | { |
| 8516 | switch (tolower(*endptr)) |
| 8517 | { |
| 8518 | default: |
| 8519 | break; |
| 8520 | case 'k': |
| 8521 | if (value > EXIM_ARITH_MAX/1024 || value < EXIM_ARITH_MIN/1024) errno = ERANGE; |
| 8522 | else value *= 1024; |
| 8523 | endptr++; |
| 8524 | break; |
| 8525 | case 'm': |
| 8526 | if (value > EXIM_ARITH_MAX/(1024*1024) || value < EXIM_ARITH_MIN/(1024*1024)) errno = ERANGE; |
| 8527 | else value *= 1024*1024; |
| 8528 | endptr++; |
| 8529 | break; |
| 8530 | case 'g': |
| 8531 | if (value > EXIM_ARITH_MAX/(1024*1024*1024) || value < EXIM_ARITH_MIN/(1024*1024*1024)) errno = ERANGE; |
| 8532 | else value *= 1024*1024*1024; |
| 8533 | endptr++; |
| 8534 | break; |
| 8535 | } |
| 8536 | if (errno == ERANGE) |
| 8537 | msg = US"absolute value of integer \"%s\" is too large (overflow)"; |
| 8538 | else |
| 8539 | { |
| 8540 | while (isspace(*endptr)) endptr++; |
| 8541 | if (*endptr == 0) return value; |
| 8542 | } |
| 8543 | } |
| 8544 | |
| 8545 | expand_string_message = string_sprintf(CS msg, s); |
| 8546 | return -2; |
| 8547 | } |
| 8548 | |
| 8549 | |
| 8550 | /* These values are usually fixed boolean values, but they are permitted to be |
| 8551 | expanded strings. |
| 8552 | |
| 8553 | Arguments: |
| 8554 | addr address being routed |
| 8555 | mtype the module type |
| 8556 | mname the module name |
| 8557 | dbg_opt debug selectors |
| 8558 | oname the option name |
| 8559 | bvalue the router's boolean value |
| 8560 | svalue the router's string value |
| 8561 | rvalue where to put the returned value |
| 8562 | |
| 8563 | Returns: OK value placed in rvalue |
| 8564 | DEFER expansion failed |
| 8565 | */ |
| 8566 | |
| 8567 | int |
| 8568 | exp_bool(address_item *addr, |
| 8569 | uschar *mtype, uschar *mname, unsigned dbg_opt, |
| 8570 | uschar *oname, BOOL bvalue, |
| 8571 | uschar *svalue, BOOL *rvalue) |
| 8572 | { |
| 8573 | uschar *expanded; |
| 8574 | if (!svalue) { *rvalue = bvalue; return OK; } |
| 8575 | |
| 8576 | if (!(expanded = expand_string(svalue))) |
| 8577 | { |
| 8578 | if (f.expand_string_forcedfail) |
| 8579 | { |
| 8580 | DEBUG(dbg_opt) debug_printf("expansion of \"%s\" forced failure\n", oname); |
| 8581 | *rvalue = bvalue; |
| 8582 | return OK; |
| 8583 | } |
| 8584 | addr->message = string_sprintf("failed to expand \"%s\" in %s %s: %s", |
| 8585 | oname, mname, mtype, expand_string_message); |
| 8586 | DEBUG(dbg_opt) debug_printf("%s\n", addr->message); |
| 8587 | return DEFER; |
| 8588 | } |
| 8589 | |
| 8590 | DEBUG(dbg_opt) debug_printf("expansion of \"%s\" yields \"%s\"\n", oname, |
| 8591 | expanded); |
| 8592 | |
| 8593 | if (strcmpic(expanded, US"true") == 0 || strcmpic(expanded, US"yes") == 0) |
| 8594 | *rvalue = TRUE; |
| 8595 | else if (strcmpic(expanded, US"false") == 0 || strcmpic(expanded, US"no") == 0) |
| 8596 | *rvalue = FALSE; |
| 8597 | else |
| 8598 | { |
| 8599 | addr->message = string_sprintf("\"%s\" is not a valid value for the " |
| 8600 | "\"%s\" option in the %s %s", expanded, oname, mname, mtype); |
| 8601 | return DEFER; |
| 8602 | } |
| 8603 | |
| 8604 | return OK; |
| 8605 | } |
| 8606 | |
| 8607 | |
| 8608 | |
| 8609 | /* Avoid potentially exposing a password in a string about to be logged */ |
| 8610 | |
| 8611 | uschar * |
| 8612 | expand_hide_passwords(uschar * s) |
| 8613 | { |
| 8614 | return ( ( Ustrstr(s, "failed to expand") != NULL |
| 8615 | || Ustrstr(s, "expansion of ") != NULL |
| 8616 | ) |
| 8617 | && ( Ustrstr(s, "mysql") != NULL |
| 8618 | || Ustrstr(s, "pgsql") != NULL |
| 8619 | || Ustrstr(s, "redis") != NULL |
| 8620 | || Ustrstr(s, "sqlite") != NULL |
| 8621 | || Ustrstr(s, "ldap:") != NULL |
| 8622 | || Ustrstr(s, "ldaps:") != NULL |
| 8623 | || Ustrstr(s, "ldapi:") != NULL |
| 8624 | || Ustrstr(s, "ldapdn:") != NULL |
| 8625 | || Ustrstr(s, "ldapm:") != NULL |
| 8626 | ) ) |
| 8627 | ? US"Temporary internal error" : s; |
| 8628 | } |
| 8629 | |
| 8630 | |
| 8631 | /* Read given named file into big_buffer. Use for keying material etc. |
| 8632 | The content will have an ascii NUL appended. |
| 8633 | |
| 8634 | Arguments: |
| 8635 | filename as it says |
| 8636 | |
| 8637 | Return: pointer to buffer, or NULL on error. |
| 8638 | */ |
| 8639 | |
| 8640 | uschar * |
| 8641 | expand_file_big_buffer(const uschar * filename) |
| 8642 | { |
| 8643 | int fd, off = 0, len; |
| 8644 | |
| 8645 | if ((fd = exim_open2(CS filename, O_RDONLY)) < 0) |
| 8646 | { |
| 8647 | log_write(0, LOG_MAIN | LOG_PANIC, "unable to open file for reading: %s", |
| 8648 | filename); |
| 8649 | return NULL; |
| 8650 | } |
| 8651 | |
| 8652 | do |
| 8653 | { |
| 8654 | if ((len = read(fd, big_buffer + off, big_buffer_size - 2 - off)) < 0) |
| 8655 | { |
| 8656 | (void) close(fd); |
| 8657 | log_write(0, LOG_MAIN|LOG_PANIC, "unable to read file: %s", filename); |
| 8658 | return NULL; |
| 8659 | } |
| 8660 | off += len; |
| 8661 | } |
| 8662 | while (len > 0); |
| 8663 | |
| 8664 | (void) close(fd); |
| 8665 | big_buffer[off] = '\0'; |
| 8666 | return big_buffer; |
| 8667 | } |
| 8668 | |
| 8669 | |
| 8670 | |
| 8671 | /************************************************* |
| 8672 | * Error-checking for testsuite * |
| 8673 | *************************************************/ |
| 8674 | typedef struct { |
| 8675 | uschar * region_start; |
| 8676 | uschar * region_end; |
| 8677 | const uschar *var_name; |
| 8678 | const uschar *var_data; |
| 8679 | } err_ctx; |
| 8680 | |
| 8681 | static void |
| 8682 | assert_variable_notin(uschar * var_name, uschar * var_data, void * ctx) |
| 8683 | { |
| 8684 | err_ctx * e = ctx; |
| 8685 | if (var_data >= e->region_start && var_data < e->region_end) |
| 8686 | { |
| 8687 | e->var_name = CUS var_name; |
| 8688 | e->var_data = CUS var_data; |
| 8689 | } |
| 8690 | } |
| 8691 | |
| 8692 | void |
| 8693 | assert_no_variables(void * ptr, int len, const char * filename, int linenumber) |
| 8694 | { |
| 8695 | err_ctx e = { .region_start = ptr, .region_end = US ptr + len, |
| 8696 | .var_name = NULL, .var_data = NULL }; |
| 8697 | |
| 8698 | /* check acl_ variables */ |
| 8699 | tree_walk(acl_var_c, assert_variable_notin, &e); |
| 8700 | tree_walk(acl_var_m, assert_variable_notin, &e); |
| 8701 | |
| 8702 | /* check auth<n> variables */ |
| 8703 | for (int i = 0; i < AUTH_VARS; i++) if (auth_vars[i]) |
| 8704 | assert_variable_notin(US"auth<n>", auth_vars[i], &e); |
| 8705 | |
| 8706 | /* check regex<n> variables */ |
| 8707 | for (int i = 0; i < REGEX_VARS; i++) if (regex_vars[i]) |
| 8708 | assert_variable_notin(US"regex<n>", regex_vars[i], &e); |
| 8709 | |
| 8710 | /* check known-name variables */ |
| 8711 | for (var_entry * v = var_table; v < var_table + var_table_size; v++) |
| 8712 | if (v->type == vtype_stringptr) |
| 8713 | assert_variable_notin(US v->name, *(USS v->value), &e); |
| 8714 | |
| 8715 | /* check dns and address trees */ |
| 8716 | tree_walk(tree_dns_fails, assert_variable_notin, &e); |
| 8717 | tree_walk(tree_duplicates, assert_variable_notin, &e); |
| 8718 | tree_walk(tree_nonrecipients, assert_variable_notin, &e); |
| 8719 | tree_walk(tree_unusable, assert_variable_notin, &e); |
| 8720 | |
| 8721 | if (e.var_name) |
| 8722 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
| 8723 | "live variable '%s' destroyed by reset_store at %s:%d\n- value '%.64s'", |
| 8724 | e.var_name, filename, linenumber, e.var_data); |
| 8725 | } |
| 8726 | |
| 8727 | |
| 8728 | |
| 8729 | /************************************************* |
| 8730 | ************************************************** |
| 8731 | * Stand-alone test program * |
| 8732 | ************************************************** |
| 8733 | *************************************************/ |
| 8734 | |
| 8735 | #ifdef STAND_ALONE |
| 8736 | |
| 8737 | |
| 8738 | BOOL |
| 8739 | regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup) |
| 8740 | { |
| 8741 | int ovector[3*(EXPAND_MAXN+1)]; |
| 8742 | int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options, |
| 8743 | ovector, nelem(ovector)); |
| 8744 | BOOL yield = n >= 0; |
| 8745 | if (n == 0) n = EXPAND_MAXN + 1; |
| 8746 | if (yield) |
| 8747 | { |
| 8748 | expand_nmax = setup < 0 ? 0 : setup + 1; |
| 8749 | for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2) |
| 8750 | { |
| 8751 | expand_nstring[expand_nmax] = subject + ovector[nn]; |
| 8752 | expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn]; |
| 8753 | } |
| 8754 | expand_nmax--; |
| 8755 | } |
| 8756 | return yield; |
| 8757 | } |
| 8758 | |
| 8759 | |
| 8760 | int main(int argc, uschar **argv) |
| 8761 | { |
| 8762 | uschar buffer[1024]; |
| 8763 | |
| 8764 | debug_selector = D_v; |
| 8765 | debug_file = stderr; |
| 8766 | debug_fd = fileno(debug_file); |
| 8767 | big_buffer = malloc(big_buffer_size); |
| 8768 | |
| 8769 | for (int i = 1; i < argc; i++) |
| 8770 | { |
| 8771 | if (argv[i][0] == '+') |
| 8772 | { |
| 8773 | debug_trace_memory = 2; |
| 8774 | argv[i]++; |
| 8775 | } |
| 8776 | if (isdigit(argv[i][0])) |
| 8777 | debug_selector = Ustrtol(argv[i], NULL, 0); |
| 8778 | else |
| 8779 | if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") == |
| 8780 | Ustrlen(argv[i])) |
| 8781 | { |
| 8782 | #ifdef LOOKUP_LDAP |
| 8783 | eldap_default_servers = argv[i]; |
| 8784 | #endif |
| 8785 | #ifdef LOOKUP_MYSQL |
| 8786 | mysql_servers = argv[i]; |
| 8787 | #endif |
| 8788 | #ifdef LOOKUP_PGSQL |
| 8789 | pgsql_servers = argv[i]; |
| 8790 | #endif |
| 8791 | #ifdef LOOKUP_REDIS |
| 8792 | redis_servers = argv[i]; |
| 8793 | #endif |
| 8794 | } |
| 8795 | #ifdef EXIM_PERL |
| 8796 | else opt_perl_startup = argv[i]; |
| 8797 | #endif |
| 8798 | } |
| 8799 | |
| 8800 | printf("Testing string expansion: debug_level = %d\n\n", debug_level); |
| 8801 | |
| 8802 | expand_nstring[1] = US"string 1...."; |
| 8803 | expand_nlength[1] = 8; |
| 8804 | expand_nmax = 1; |
| 8805 | |
| 8806 | #ifdef EXIM_PERL |
| 8807 | if (opt_perl_startup != NULL) |
| 8808 | { |
| 8809 | uschar *errstr; |
| 8810 | printf("Starting Perl interpreter\n"); |
| 8811 | errstr = init_perl(opt_perl_startup); |
| 8812 | if (errstr != NULL) |
| 8813 | { |
| 8814 | printf("** error in perl_startup code: %s\n", errstr); |
| 8815 | return EXIT_FAILURE; |
| 8816 | } |
| 8817 | } |
| 8818 | #endif /* EXIM_PERL */ |
| 8819 | |
| 8820 | /* Thie deliberately regards the input as untainted, so that it can be |
| 8821 | expanded; only reasonable since this is a test for string-expansions. */ |
| 8822 | |
| 8823 | while (fgets(buffer, sizeof(buffer), stdin) != NULL) |
| 8824 | { |
| 8825 | rmark reset_point = store_mark(); |
| 8826 | uschar *yield = expand_string(buffer); |
| 8827 | if (yield) |
| 8828 | printf("%s\n", yield); |
| 8829 | else |
| 8830 | { |
| 8831 | if (f.search_find_defer) printf("search_find deferred\n"); |
| 8832 | printf("Failed: %s\n", expand_string_message); |
| 8833 | if (f.expand_string_forcedfail) printf("Forced failure\n"); |
| 8834 | printf("\n"); |
| 8835 | } |
| 8836 | store_reset(reset_point); |
| 8837 | } |
| 8838 | |
| 8839 | search_tidyup(); |
| 8840 | |
| 8841 | return 0; |
| 8842 | } |
| 8843 | |
| 8844 | #endif |
| 8845 | |
| 8846 | /* vi: aw ai sw=2 |
| 8847 | */ |
| 8848 | /* End of expand.c */ |