| 1 | /* $Cambridge: exim/src/src/acl.c,v 1.3 2004/10/19 11:04:26 ph10 Exp $ */ |
| 2 | |
| 3 | /************************************************* |
| 4 | * Exim - an Internet mail transport agent * |
| 5 | *************************************************/ |
| 6 | |
| 7 | /* Copyright (c) University of Cambridge 1995 - 2004 */ |
| 8 | /* See the file NOTICE for conditions of use and distribution. */ |
| 9 | |
| 10 | /* Code for handling Access Control Lists (ACLs) */ |
| 11 | |
| 12 | #include "exim.h" |
| 13 | |
| 14 | |
| 15 | /* Default callout timeout */ |
| 16 | |
| 17 | #define CALLOUT_TIMEOUT_DEFAULT 30 |
| 18 | |
| 19 | /* ACL verb codes - keep in step with the table of verbs that follows */ |
| 20 | |
| 21 | enum { ACL_ACCEPT, ACL_DEFER, ACL_DENY, ACL_DISCARD, ACL_DROP, ACL_REQUIRE, |
| 22 | ACL_WARN }; |
| 23 | |
| 24 | /* ACL verbs */ |
| 25 | |
| 26 | static uschar *verbs[] = |
| 27 | { US"accept", US"defer", US"deny", US"discard", US"drop", US"require", |
| 28 | US"warn" }; |
| 29 | |
| 30 | /* For each verb, the condition for which "message" is used */ |
| 31 | |
| 32 | static int msgcond[] = { FAIL, OK, OK, FAIL, OK, FAIL, OK }; |
| 33 | |
| 34 | /* ACL condition and modifier codes - keep in step with the table that |
| 35 | follows. */ |
| 36 | |
| 37 | enum { ACLC_ACL, ACLC_AUTHENTICATED, ACLC_CONDITION, ACLC_CONTROL, ACLC_DELAY, |
| 38 | ACLC_DNSLISTS, ACLC_DOMAINS, ACLC_ENCRYPTED, ACLC_ENDPASS, ACLC_HOSTS, |
| 39 | ACLC_LOCAL_PARTS, ACLC_LOG_MESSAGE, ACLC_LOGWRITE, ACLC_MESSAGE, |
| 40 | ACLC_RECIPIENTS, ACLC_SENDER_DOMAINS, ACLC_SENDERS, ACLC_SET, ACLC_VERIFY }; |
| 41 | |
| 42 | /* ACL conditions/modifiers: "delay", "control", "endpass", "message", |
| 43 | "log_message", "logwrite", and "set" are modifiers that look like conditions |
| 44 | but always return TRUE. They are used for their side effects. */ |
| 45 | |
| 46 | static uschar *conditions[] = { US"acl", US"authenticated", US"condition", |
| 47 | US"control", US"delay", US"dnslists", US"domains", US"encrypted", |
| 48 | US"endpass", US"hosts", US"local_parts", US"log_message", US"logwrite", |
| 49 | US"message", US"recipients", US"sender_domains", US"senders", US"set", |
| 50 | US"verify" }; |
| 51 | |
| 52 | /* ACL control names */ |
| 53 | |
| 54 | static uschar *controls[] = { US"error", US"caseful_local_part", |
| 55 | US"caselower_local_part", US"enforce_sync", US"no_enforce_sync", US"freeze", |
| 56 | US"queue_only", US"submission", US"no_multiline"}; |
| 57 | |
| 58 | /* Flags to indicate for which conditions /modifiers a string expansion is done |
| 59 | at the outer level. In the other cases, expansion already occurs in the |
| 60 | checking functions. */ |
| 61 | |
| 62 | static uschar cond_expand_at_top[] = { |
| 63 | TRUE, /* acl */ |
| 64 | FALSE, /* authenticated */ |
| 65 | TRUE, /* condition */ |
| 66 | TRUE, /* control */ |
| 67 | TRUE, /* delay */ |
| 68 | TRUE, /* dnslists */ |
| 69 | FALSE, /* domains */ |
| 70 | FALSE, /* encrypted */ |
| 71 | TRUE, /* endpass */ |
| 72 | FALSE, /* hosts */ |
| 73 | FALSE, /* local_parts */ |
| 74 | TRUE, /* log_message */ |
| 75 | TRUE, /* logwrite */ |
| 76 | TRUE, /* message */ |
| 77 | FALSE, /* recipients */ |
| 78 | FALSE, /* sender_domains */ |
| 79 | FALSE, /* senders */ |
| 80 | TRUE, /* set */ |
| 81 | TRUE /* verify */ |
| 82 | }; |
| 83 | |
| 84 | /* Flags to identify the modifiers */ |
| 85 | |
| 86 | static uschar cond_modifiers[] = { |
| 87 | FALSE, /* acl */ |
| 88 | FALSE, /* authenticated */ |
| 89 | FALSE, /* condition */ |
| 90 | TRUE, /* control */ |
| 91 | TRUE, /* delay */ |
| 92 | FALSE, /* dnslists */ |
| 93 | FALSE, /* domains */ |
| 94 | FALSE, /* encrypted */ |
| 95 | TRUE, /* endpass */ |
| 96 | FALSE, /* hosts */ |
| 97 | FALSE, /* local_parts */ |
| 98 | TRUE, /* log_message */ |
| 99 | TRUE, /* log_write */ |
| 100 | TRUE, /* message */ |
| 101 | FALSE, /* recipients */ |
| 102 | FALSE, /* sender_domains */ |
| 103 | FALSE, /* senders */ |
| 104 | TRUE, /* set */ |
| 105 | FALSE /* verify */ |
| 106 | }; |
| 107 | |
| 108 | /* Bit map vector of which conditions are not allowed at certain times. For |
| 109 | each condition, there's a bitmap of dis-allowed times. */ |
| 110 | |
| 111 | static unsigned int cond_forbids[] = { |
| 112 | 0, /* acl */ |
| 113 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_CONNECT)| /* authenticated */ |
| 114 | (1<<ACL_WHERE_HELO), |
| 115 | 0, /* condition */ |
| 116 | |
| 117 | /* Certain types of control are always allowed, so we let it through |
| 118 | always and check in the control processing itself */ |
| 119 | |
| 120 | 0, /* control */ |
| 121 | 0, /* delay */ |
| 122 | (1<<ACL_WHERE_NOTSMTP), /* dnslists */ |
| 123 | |
| 124 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_AUTH)| /* domains */ |
| 125 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
| 126 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_PREDATA)| |
| 127 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
| 128 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| |
| 129 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| |
| 130 | (1<<ACL_WHERE_VRFY), |
| 131 | |
| 132 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_CONNECT)| /* encrypted */ |
| 133 | (1<<ACL_WHERE_HELO), |
| 134 | 0, /* endpass */ |
| 135 | (1<<ACL_WHERE_NOTSMTP), /* hosts */ |
| 136 | |
| 137 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_AUTH)| /* local_parts */ |
| 138 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
| 139 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_PREDATA)| |
| 140 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
| 141 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| |
| 142 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| |
| 143 | (1<<ACL_WHERE_VRFY), |
| 144 | |
| 145 | 0, /* log_message */ |
| 146 | 0, /* logwrite */ |
| 147 | 0, /* message */ |
| 148 | |
| 149 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_AUTH)| /* recipients */ |
| 150 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
| 151 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_PREDATA)| |
| 152 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
| 153 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| |
| 154 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| |
| 155 | (1<<ACL_WHERE_VRFY), |
| 156 | |
| 157 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* sender_domains */ |
| 158 | (1<<ACL_WHERE_HELO)| |
| 159 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| |
| 160 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
| 161 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), |
| 162 | |
| 163 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* senders */ |
| 164 | (1<<ACL_WHERE_HELO)| |
| 165 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| |
| 166 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
| 167 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), |
| 168 | |
| 169 | 0, /* set */ |
| 170 | |
| 171 | /* Certain types of verify are always allowed, so we let it through |
| 172 | always and check in the verify function itself */ |
| 173 | |
| 174 | 0 /* verify */ |
| 175 | }; |
| 176 | |
| 177 | |
| 178 | /* Return values from decode_control() */ |
| 179 | |
| 180 | enum { CONTROL_ERROR, CONTROL_CASEFUL_LOCAL_PART, CONTROL_CASELOWER_LOCAL_PART, |
| 181 | CONTROL_ENFORCE_SYNC, CONTROL_NO_ENFORCE_SYNC, CONTROL_FREEZE, |
| 182 | CONTROL_QUEUE_ONLY, CONTROL_SUBMISSION, CONTROL_NO_MULTILINE }; |
| 183 | |
| 184 | /* Bit map vector of which controls are not allowed at certain times. For |
| 185 | each control, there's a bitmap of dis-allowed times. For some, it is easier to |
| 186 | specify the negation of a small number of allowed times. */ |
| 187 | |
| 188 | static unsigned int control_forbids[] = { |
| 189 | 0, /* error */ |
| 190 | ~(1<<ACL_WHERE_RCPT), /* caseful_local_part */ |
| 191 | ~(1<<ACL_WHERE_RCPT), /* caselower_local_part */ |
| 192 | (1<<ACL_WHERE_NOTSMTP), /* enforce_sync */ |
| 193 | (1<<ACL_WHERE_NOTSMTP), /* no_enforce_sync */ |
| 194 | |
| 195 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* freeze */ |
| 196 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
| 197 | (1<<ACL_WHERE_NOTSMTP)), |
| 198 | |
| 199 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* queue_only */ |
| 200 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
| 201 | (1<<ACL_WHERE_NOTSMTP)), |
| 202 | |
| 203 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* submission */ |
| 204 | (1<<ACL_WHERE_PREDATA)), |
| 205 | |
| 206 | (1<<ACL_WHERE_NOTSMTP) /* no_multiline */ |
| 207 | }; |
| 208 | |
| 209 | /* Structure listing various control arguments, with their characteristics. */ |
| 210 | |
| 211 | typedef struct control_def { |
| 212 | uschar *name; |
| 213 | int value; /* CONTROL_xxx value */ |
| 214 | BOOL has_option; /* Has /option(s) following */ |
| 215 | } control_def; |
| 216 | |
| 217 | static control_def controls_list[] = { |
| 218 | { US"caseful_local_part", CONTROL_CASEFUL_LOCAL_PART, FALSE}, |
| 219 | { US"caselower_local_part", CONTROL_CASELOWER_LOCAL_PART, FALSE}, |
| 220 | { US"enforce_sync", CONTROL_ENFORCE_SYNC, FALSE}, |
| 221 | { US"freeze", CONTROL_FREEZE, FALSE}, |
| 222 | { US"no_enforce_sync", CONTROL_NO_ENFORCE_SYNC, FALSE}, |
| 223 | { US"no_multiline_responses", CONTROL_NO_MULTILINE, FALSE}, |
| 224 | { US"queue_only", CONTROL_QUEUE_ONLY, FALSE}, |
| 225 | { US"submission", CONTROL_SUBMISSION, TRUE} |
| 226 | }; |
| 227 | |
| 228 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
| 229 | |
| 230 | static int acl_check_internal(int, address_item *, uschar *, int, uschar **, |
| 231 | uschar **); |
| 232 | |
| 233 | |
| 234 | /************************************************* |
| 235 | * Pick out name from list * |
| 236 | *************************************************/ |
| 237 | |
| 238 | /* Use a binary chop method |
| 239 | |
| 240 | Arguments: |
| 241 | name name to find |
| 242 | list list of names |
| 243 | end size of list |
| 244 | |
| 245 | Returns: offset in list, or -1 if not found |
| 246 | */ |
| 247 | |
| 248 | static int |
| 249 | acl_checkname(uschar *name, uschar **list, int end) |
| 250 | { |
| 251 | int start = 0; |
| 252 | |
| 253 | while (start < end) |
| 254 | { |
| 255 | int mid = (start + end)/2; |
| 256 | int c = Ustrcmp(name, list[mid]); |
| 257 | if (c == 0) return mid; |
| 258 | if (c < 0) end = mid; else start = mid + 1; |
| 259 | } |
| 260 | |
| 261 | return -1; |
| 262 | } |
| 263 | |
| 264 | |
| 265 | /************************************************* |
| 266 | * Read and parse one ACL * |
| 267 | *************************************************/ |
| 268 | |
| 269 | /* This function is called both from readconf in order to parse the ACLs in the |
| 270 | configuration file, and also when an ACL is encountered dynamically (e.g. as |
| 271 | the result of an expansion). It is given a function to call in order to |
| 272 | retrieve the lines of the ACL. This function handles skipping comments and |
| 273 | blank lines (where relevant). |
| 274 | |
| 275 | Arguments: |
| 276 | func function to get next line of ACL |
| 277 | error where to put an error message |
| 278 | |
| 279 | Returns: pointer to ACL, or NULL |
| 280 | NULL can be legal (empty ACL); in this case error will be NULL |
| 281 | */ |
| 282 | |
| 283 | acl_block * |
| 284 | acl_read(uschar *(*func)(void), uschar **error) |
| 285 | { |
| 286 | acl_block *yield = NULL; |
| 287 | acl_block **lastp = &yield; |
| 288 | acl_block *this = NULL; |
| 289 | acl_condition_block *cond; |
| 290 | acl_condition_block **condp = NULL; |
| 291 | uschar *s; |
| 292 | |
| 293 | *error = NULL; |
| 294 | |
| 295 | while ((s = (*func)()) != NULL) |
| 296 | { |
| 297 | int v, c; |
| 298 | BOOL negated = FALSE; |
| 299 | uschar *saveline = s; |
| 300 | uschar name[64]; |
| 301 | |
| 302 | /* Conditions (but not verbs) are allowed to be negated by an initial |
| 303 | exclamation mark. */ |
| 304 | |
| 305 | while (isspace(*s)) s++; |
| 306 | if (*s == '!') |
| 307 | { |
| 308 | negated = TRUE; |
| 309 | s++; |
| 310 | } |
| 311 | |
| 312 | /* Read the name of a verb or a condition, or the start of a new ACL */ |
| 313 | |
| 314 | s = readconf_readname(name, sizeof(name), s); |
| 315 | if (*s == ':') |
| 316 | { |
| 317 | if (negated || name[0] == 0) |
| 318 | { |
| 319 | *error = string_sprintf("malformed ACL name in \"%s\"", saveline); |
| 320 | return NULL; |
| 321 | } |
| 322 | break; |
| 323 | } |
| 324 | |
| 325 | /* If a verb is unrecognized, it may be another condition or modifier that |
| 326 | continues the previous verb. */ |
| 327 | |
| 328 | v = acl_checkname(name, verbs, sizeof(verbs)/sizeof(char *)); |
| 329 | if (v < 0) |
| 330 | { |
| 331 | if (this == NULL) |
| 332 | { |
| 333 | *error = string_sprintf("unknown ACL verb in \"%s\"", saveline); |
| 334 | return NULL; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | /* New verb */ |
| 339 | |
| 340 | else |
| 341 | { |
| 342 | if (negated) |
| 343 | { |
| 344 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); |
| 345 | return NULL; |
| 346 | } |
| 347 | this = store_get(sizeof(acl_block)); |
| 348 | *lastp = this; |
| 349 | lastp = &(this->next); |
| 350 | this->next = NULL; |
| 351 | this->verb = v; |
| 352 | this->condition = NULL; |
| 353 | condp = &(this->condition); |
| 354 | if (*s == 0) continue; /* No condition on this line */ |
| 355 | if (*s == '!') |
| 356 | { |
| 357 | negated = TRUE; |
| 358 | s++; |
| 359 | } |
| 360 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ |
| 361 | } |
| 362 | |
| 363 | /* Handle a condition or modifier. */ |
| 364 | |
| 365 | c = acl_checkname(name, conditions, sizeof(conditions)/sizeof(char *)); |
| 366 | if (c < 0) |
| 367 | { |
| 368 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", |
| 369 | saveline); |
| 370 | return NULL; |
| 371 | } |
| 372 | |
| 373 | /* The modifiers may not be negated */ |
| 374 | |
| 375 | if (negated && cond_modifiers[c]) |
| 376 | { |
| 377 | *error = string_sprintf("ACL error: negation is not allowed with " |
| 378 | "\"%s\"", conditions[c]); |
| 379 | return NULL; |
| 380 | } |
| 381 | |
| 382 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ |
| 383 | |
| 384 | if (c == ACLC_ENDPASS && |
| 385 | this->verb != ACL_ACCEPT && |
| 386 | this->verb != ACL_DISCARD) |
| 387 | { |
| 388 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", |
| 389 | conditions[c], verbs[this->verb]); |
| 390 | return NULL; |
| 391 | } |
| 392 | |
| 393 | cond = store_get(sizeof(acl_condition_block)); |
| 394 | cond->next = NULL; |
| 395 | cond->type = c; |
| 396 | cond->u.negated = negated; |
| 397 | |
| 398 | *condp = cond; |
| 399 | condp = &(cond->next); |
| 400 | |
| 401 | /* The "set" modifier is different in that its argument is "name=value" |
| 402 | rather than just a value, and we can check the validity of the name, which |
| 403 | gives us a variable number to insert into the data block. */ |
| 404 | |
| 405 | if (c == ACLC_SET) |
| 406 | { |
| 407 | if (Ustrncmp(s, "acl_", 4) != 0 || (s[4] != 'c' && s[4] != 'm') || |
| 408 | !isdigit(s[5]) || (!isspace(s[6]) && s[6] != '=')) |
| 409 | { |
| 410 | *error = string_sprintf("unrecognized name after \"set\" in ACL " |
| 411 | "modifier \"set %s\"", s); |
| 412 | return NULL; |
| 413 | } |
| 414 | |
| 415 | cond->u.varnumber = s[5] - '0'; |
| 416 | if (s[4] == 'm') cond->u.varnumber += ACL_C_MAX; |
| 417 | s += 6; |
| 418 | while (isspace(*s)) s++; |
| 419 | } |
| 420 | |
| 421 | /* For "set", we are now positioned for the data. For the others, only |
| 422 | "endpass" has no data */ |
| 423 | |
| 424 | if (c != ACLC_ENDPASS) |
| 425 | { |
| 426 | if (*s++ != '=') |
| 427 | { |
| 428 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, |
| 429 | cond_modifiers[c]? US"modifier" : US"condition"); |
| 430 | return NULL; |
| 431 | } |
| 432 | while (isspace(*s)) s++; |
| 433 | cond->arg = string_copy(s); |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | return yield; |
| 438 | } |
| 439 | |
| 440 | |
| 441 | |
| 442 | /************************************************* |
| 443 | * Handle warnings * |
| 444 | *************************************************/ |
| 445 | |
| 446 | /* This function is called when a WARN verb's conditions are true. It adds to |
| 447 | the message's headers, and/or writes information to the log. In each case, this |
| 448 | only happens once (per message for headers, per connection for log). |
| 449 | |
| 450 | Arguments: |
| 451 | where ACL_WHERE_xxxx indicating which ACL this is |
| 452 | user_message message for adding to headers |
| 453 | log_message message for logging, if different |
| 454 | |
| 455 | Returns: nothing |
| 456 | */ |
| 457 | |
| 458 | static void |
| 459 | acl_warn(int where, uschar *user_message, uschar *log_message) |
| 460 | { |
| 461 | int hlen; |
| 462 | |
| 463 | if (log_message != NULL && log_message != user_message) |
| 464 | { |
| 465 | uschar *text; |
| 466 | string_item *logged; |
| 467 | |
| 468 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), |
| 469 | string_printing(log_message)); |
| 470 | |
| 471 | /* If a sender verification has failed, and the log message is "sender verify |
| 472 | failed", add the failure message. */ |
| 473 | |
| 474 | if (sender_verified_failed != NULL && |
| 475 | sender_verified_failed->message != NULL && |
| 476 | strcmpic(log_message, US"sender verify failed") == 0) |
| 477 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); |
| 478 | |
| 479 | /* Search previously logged warnings. They are kept in malloc store so they |
| 480 | can be freed at the start of a new message. */ |
| 481 | |
| 482 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) |
| 483 | if (Ustrcmp(logged->text, text) == 0) break; |
| 484 | |
| 485 | if (logged == NULL) |
| 486 | { |
| 487 | int length = Ustrlen(text) + 1; |
| 488 | log_write(0, LOG_MAIN, "%s", text); |
| 489 | logged = store_malloc(sizeof(string_item) + length); |
| 490 | logged->text = (uschar *)logged + sizeof(string_item); |
| 491 | memcpy(logged->text, text, length); |
| 492 | logged->next = acl_warn_logged; |
| 493 | acl_warn_logged = logged; |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | /* If there's no user message, we are done. */ |
| 498 | |
| 499 | if (user_message == NULL) return; |
| 500 | |
| 501 | /* If this isn't a message ACL, we can't do anything with a user message. |
| 502 | Log an error. */ |
| 503 | |
| 504 | if (where > ACL_WHERE_NOTSMTP) |
| 505 | { |
| 506 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " |
| 507 | "found in a non-message (%s) ACL: cannot specify header lines here: " |
| 508 | "message ignored", acl_wherenames[where]); |
| 509 | return; |
| 510 | } |
| 511 | |
| 512 | /* Treat the user message as a sequence of one or more header lines. */ |
| 513 | |
| 514 | hlen = Ustrlen(user_message); |
| 515 | if (hlen > 0) |
| 516 | { |
| 517 | uschar *text, *p, *q; |
| 518 | |
| 519 | /* Add a final newline if not present */ |
| 520 | |
| 521 | text = ((user_message)[hlen-1] == '\n')? user_message : |
| 522 | string_sprintf("%s\n", user_message); |
| 523 | |
| 524 | /* Loop for multiple header lines, taking care about continuations */ |
| 525 | |
| 526 | for (p = q = text; *p != 0; ) |
| 527 | { |
| 528 | uschar *s; |
| 529 | int newtype = htype_add_bot; |
| 530 | header_line **hptr = &acl_warn_headers; |
| 531 | |
| 532 | /* Find next header line within the string */ |
| 533 | |
| 534 | for (;;) |
| 535 | { |
| 536 | q = Ustrchr(q, '\n'); |
| 537 | if (*(++q) != ' ' && *q != '\t') break; |
| 538 | } |
| 539 | |
| 540 | /* If the line starts with a colon, interpret the instruction for where to |
| 541 | add it. This temporarily sets up a new type. */ |
| 542 | |
| 543 | if (*p == ':') |
| 544 | { |
| 545 | if (strncmpic(p, US":after_received:", 16) == 0) |
| 546 | { |
| 547 | newtype = htype_add_rec; |
| 548 | p += 16; |
| 549 | } |
| 550 | else if (strncmpic(p, US":at_start:", 10) == 0) |
| 551 | { |
| 552 | newtype = htype_add_top; |
| 553 | p += 10; |
| 554 | } |
| 555 | else if (strncmpic(p, US":at_end:", 8) == 0) |
| 556 | { |
| 557 | newtype = htype_add_bot; |
| 558 | p += 8; |
| 559 | } |
| 560 | while (*p == ' ' || *p == '\t') p++; |
| 561 | } |
| 562 | |
| 563 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: |
| 564 | to the front of it. */ |
| 565 | |
| 566 | for (s = p; s < q - 1; s++) |
| 567 | { |
| 568 | if (*s == ':' || !isgraph(*s)) break; |
| 569 | } |
| 570 | |
| 571 | s = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", q - p, p); |
| 572 | hlen = Ustrlen(s); |
| 573 | |
| 574 | /* See if this line has already been added */ |
| 575 | |
| 576 | while (*hptr != NULL) |
| 577 | { |
| 578 | if (Ustrncmp((*hptr)->text, s, hlen) == 0) break; |
| 579 | hptr = &((*hptr)->next); |
| 580 | } |
| 581 | |
| 582 | /* Add if not previously present */ |
| 583 | |
| 584 | if (*hptr == NULL) |
| 585 | { |
| 586 | header_line *h = store_get(sizeof(header_line)); |
| 587 | h->text = s; |
| 588 | h->next = NULL; |
| 589 | h->type = newtype; |
| 590 | h->slen = hlen; |
| 591 | *hptr = h; |
| 592 | hptr = &(h->next); |
| 593 | } |
| 594 | |
| 595 | /* Advance for next header line within the string */ |
| 596 | |
| 597 | p = q; |
| 598 | } |
| 599 | } |
| 600 | } |
| 601 | |
| 602 | |
| 603 | |
| 604 | /************************************************* |
| 605 | * Verify and check reverse DNS * |
| 606 | *************************************************/ |
| 607 | |
| 608 | /* Called from acl_verify() below. We look up the host name(s) of the client IP |
| 609 | address if this has not yet been done. The host_name_lookup() function checks |
| 610 | that one of these names resolves to an address list that contains the client IP |
| 611 | address, so we don't actually have to do the check here. |
| 612 | |
| 613 | Arguments: |
| 614 | user_msgptr pointer for user message |
| 615 | log_msgptr pointer for log message |
| 616 | |
| 617 | Returns: OK verification condition succeeded |
| 618 | FAIL verification failed |
| 619 | DEFER there was a problem verifying |
| 620 | */ |
| 621 | |
| 622 | static int |
| 623 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) |
| 624 | { |
| 625 | int rc; |
| 626 | |
| 627 | user_msgptr = user_msgptr; /* stop compiler warning */ |
| 628 | |
| 629 | /* Previous success */ |
| 630 | |
| 631 | if (sender_host_name != NULL) return OK; |
| 632 | |
| 633 | /* Previous failure */ |
| 634 | |
| 635 | if (host_lookup_failed) |
| 636 | { |
| 637 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); |
| 638 | return FAIL; |
| 639 | } |
| 640 | |
| 641 | /* Need to do a lookup */ |
| 642 | |
| 643 | HDEBUG(D_acl) |
| 644 | debug_printf("looking up host name to force name/address consistency check\n"); |
| 645 | |
| 646 | if ((rc = host_name_lookup()) != OK) |
| 647 | { |
| 648 | *log_msgptr = (rc == DEFER)? |
| 649 | US"host lookup deferred for reverse lookup check" |
| 650 | : |
| 651 | string_sprintf("host lookup failed for reverse lookup check%s", |
| 652 | host_lookup_msg); |
| 653 | return rc; /* DEFER or FAIL */ |
| 654 | } |
| 655 | |
| 656 | host_build_sender_fullhost(); |
| 657 | return OK; |
| 658 | } |
| 659 | |
| 660 | |
| 661 | |
| 662 | /************************************************* |
| 663 | * Handle verification (address & other) * |
| 664 | *************************************************/ |
| 665 | |
| 666 | /* This function implements the "verify" condition. It is called when |
| 667 | encountered in any ACL, because some tests are almost always permitted. Some |
| 668 | just don't make sense, and always fail (for example, an attempt to test a host |
| 669 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. |
| 670 | |
| 671 | Arguments: |
| 672 | where where called from |
| 673 | addr the recipient address that the ACL is handling, or NULL |
| 674 | arg the argument of "verify" |
| 675 | user_msgptr pointer for user message |
| 676 | log_msgptr pointer for log message |
| 677 | basic_errno where to put verify errno |
| 678 | |
| 679 | Returns: OK verification condition succeeded |
| 680 | FAIL verification failed |
| 681 | DEFER there was a problem verifying |
| 682 | ERROR syntax error |
| 683 | */ |
| 684 | |
| 685 | static int |
| 686 | acl_verify(int where, address_item *addr, uschar *arg, |
| 687 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) |
| 688 | { |
| 689 | int sep = '/'; |
| 690 | int callout = -1; |
| 691 | int callout_overall = -1; |
| 692 | int verify_options = 0; |
| 693 | int rc; |
| 694 | BOOL verify_header_sender = FALSE; |
| 695 | BOOL defer_ok = FALSE; |
| 696 | BOOL callout_defer_ok = FALSE; |
| 697 | BOOL no_details = FALSE; |
| 698 | address_item *sender_vaddr = NULL; |
| 699 | uschar *verify_sender_address = NULL; |
| 700 | uschar *pm_mailfrom = NULL; |
| 701 | uschar *se_mailfrom = NULL; |
| 702 | uschar *list = arg; |
| 703 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); |
| 704 | |
| 705 | if (ss == NULL) goto BAD_VERIFY; |
| 706 | |
| 707 | /* Handle name/address consistency verification in a separate function. */ |
| 708 | |
| 709 | if (strcmpic(ss, US"reverse_host_lookup") == 0) |
| 710 | { |
| 711 | if (sender_host_address == NULL) return OK; |
| 712 | return acl_verify_reverse(user_msgptr, log_msgptr); |
| 713 | } |
| 714 | |
| 715 | /* TLS certificate verification is done at STARTTLS time; here we just |
| 716 | test whether it was successful or not. (This is for optional verification; for |
| 717 | mandatory verification, the connection doesn't last this long.) */ |
| 718 | |
| 719 | if (strcmpic(ss, US"certificate") == 0) |
| 720 | { |
| 721 | if (tls_certificate_verified) return OK; |
| 722 | *user_msgptr = US"no verified certificate"; |
| 723 | return FAIL; |
| 724 | } |
| 725 | |
| 726 | /* We can test the result of optional HELO verification */ |
| 727 | |
| 728 | if (strcmpic(ss, US"helo") == 0) return helo_verified? OK : FAIL; |
| 729 | |
| 730 | /* Handle header verification options - permitted only after DATA or a non-SMTP |
| 731 | message. */ |
| 732 | |
| 733 | if (strncmpic(ss, US"header_", 7) == 0) |
| 734 | { |
| 735 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) |
| 736 | { |
| 737 | *log_msgptr = string_sprintf("cannot check header contents in ACL for %s " |
| 738 | "(only possible in ACL for DATA)", acl_wherenames[where]); |
| 739 | return ERROR; |
| 740 | } |
| 741 | |
| 742 | /* Check that all relevant header lines have the correct syntax. If there is |
| 743 | a syntax error, we return details of the error to the sender if configured to |
| 744 | send out full details. (But a "message" setting on the ACL can override, as |
| 745 | always). */ |
| 746 | |
| 747 | if (strcmpic(ss+7, US"syntax") == 0) |
| 748 | { |
| 749 | int rc = verify_check_headers(log_msgptr); |
| 750 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) |
| 751 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); |
| 752 | return rc; |
| 753 | } |
| 754 | |
| 755 | /* Check that there is at least one verifiable sender address in the relevant |
| 756 | header lines. This can be followed by callout and defer options, just like |
| 757 | sender and recipient. */ |
| 758 | |
| 759 | else if (strcmpic(ss+7, US"sender") == 0) verify_header_sender = TRUE; |
| 760 | |
| 761 | /* Unknown verify argument starting with "header_" */ |
| 762 | |
| 763 | else goto BAD_VERIFY; |
| 764 | } |
| 765 | |
| 766 | /* Otherwise, first item in verify argument must be "sender" or "recipient". |
| 767 | In the case of a sender, this can optionally be followed by an address to use |
| 768 | in place of the actual sender (rare special-case requirement). */ |
| 769 | |
| 770 | else if (strncmpic(ss, US"sender", 6) == 0) |
| 771 | { |
| 772 | uschar *s = ss + 6; |
| 773 | if (where > ACL_WHERE_NOTSMTP) |
| 774 | { |
| 775 | *log_msgptr = string_sprintf("cannot verify sender in ACL for %s " |
| 776 | "(only possible for MAIL, RCPT, PREDATA, or DATA)", |
| 777 | acl_wherenames[where]); |
| 778 | return ERROR; |
| 779 | } |
| 780 | if (*s == 0) |
| 781 | verify_sender_address = sender_address; |
| 782 | else |
| 783 | { |
| 784 | while (isspace(*s)) s++; |
| 785 | if (*s++ != '=') goto BAD_VERIFY; |
| 786 | while (isspace(*s)) s++; |
| 787 | verify_sender_address = string_copy(s); |
| 788 | } |
| 789 | } |
| 790 | else |
| 791 | { |
| 792 | if (strcmpic(ss, US"recipient") != 0) goto BAD_VERIFY; |
| 793 | if (addr == NULL) |
| 794 | { |
| 795 | *log_msgptr = string_sprintf("cannot verify recipient in ACL for %s " |
| 796 | "(only possible for RCPT)", acl_wherenames[where]); |
| 797 | return ERROR; |
| 798 | } |
| 799 | } |
| 800 | |
| 801 | /* Remaining items are optional */ |
| 802 | |
| 803 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) |
| 804 | != NULL) |
| 805 | { |
| 806 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; |
| 807 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; |
| 808 | |
| 809 | /* These two old options are left for backwards compatibility */ |
| 810 | |
| 811 | else if (strcmpic(ss, US"callout_defer_ok") == 0) |
| 812 | { |
| 813 | callout_defer_ok = TRUE; |
| 814 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; |
| 815 | } |
| 816 | |
| 817 | else if (strcmpic(ss, US"check_postmaster") == 0) |
| 818 | { |
| 819 | pm_mailfrom = US""; |
| 820 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; |
| 821 | } |
| 822 | |
| 823 | /* The callout option has a number of sub-options, comma separated */ |
| 824 | |
| 825 | else if (strncmpic(ss, US"callout", 7) == 0) |
| 826 | { |
| 827 | callout = CALLOUT_TIMEOUT_DEFAULT; |
| 828 | ss += 7; |
| 829 | if (*ss != 0) |
| 830 | { |
| 831 | while (isspace(*ss)) ss++; |
| 832 | if (*ss++ == '=') |
| 833 | { |
| 834 | int optsep = ','; |
| 835 | uschar *opt; |
| 836 | uschar buffer[256]; |
| 837 | while (isspace(*ss)) ss++; |
| 838 | while ((opt = string_nextinlist(&ss, &optsep, buffer, sizeof(buffer))) |
| 839 | != NULL) |
| 840 | { |
| 841 | if (strcmpic(opt, US"defer_ok") == 0) callout_defer_ok = TRUE; |
| 842 | else if (strcmpic(opt, US"no_cache") == 0) |
| 843 | verify_options |= vopt_callout_no_cache; |
| 844 | else if (strcmpic(opt, US"random") == 0) |
| 845 | verify_options |= vopt_callout_random; |
| 846 | else if (strcmpic(opt, US"use_sender") == 0) |
| 847 | verify_options |= vopt_callout_recipsender; |
| 848 | else if (strcmpic(opt, US"use_postmaster") == 0) |
| 849 | verify_options |= vopt_callout_recippmaster; |
| 850 | else if (strcmpic(opt, US"postmaster") == 0) pm_mailfrom = US""; |
| 851 | |
| 852 | else if (strncmpic(opt, US"mailfrom", 8) == 0) |
| 853 | { |
| 854 | if (!verify_header_sender) |
| 855 | { |
| 856 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " |
| 857 | "callout option only for verify=header_sender (detected in ACL " |
| 858 | "condition \"%s\")", arg); |
| 859 | return ERROR; |
| 860 | } |
| 861 | opt += 8; |
| 862 | while (isspace(*opt)) opt++; |
| 863 | if (*opt++ != '=') |
| 864 | { |
| 865 | *log_msgptr = string_sprintf("'=' expected after " |
| 866 | "\"mailfrom\" in ACL condition \"%s\"", arg); |
| 867 | return ERROR; |
| 868 | } |
| 869 | while (isspace(*opt)) opt++; |
| 870 | se_mailfrom = string_copy(opt); |
| 871 | } |
| 872 | |
| 873 | else if (strncmpic(opt, US"postmaster_mailfrom", 19) == 0) |
| 874 | { |
| 875 | opt += 19; |
| 876 | while (isspace(*opt)) opt++; |
| 877 | if (*opt++ != '=') |
| 878 | { |
| 879 | *log_msgptr = string_sprintf("'=' expected after " |
| 880 | "\"postmaster_mailfrom\" in ACL condition \"%s\"", arg); |
| 881 | return ERROR; |
| 882 | } |
| 883 | while (isspace(*opt)) opt++; |
| 884 | pm_mailfrom = string_copy(opt); |
| 885 | } |
| 886 | |
| 887 | else if (strncmpic(opt, US"maxwait", 7) == 0) |
| 888 | { |
| 889 | opt += 7; |
| 890 | while (isspace(*opt)) opt++; |
| 891 | if (*opt++ != '=') |
| 892 | { |
| 893 | *log_msgptr = string_sprintf("'=' expected after \"maxwait\" in " |
| 894 | "ACL condition \"%s\"", arg); |
| 895 | return ERROR; |
| 896 | } |
| 897 | while (isspace(*opt)) opt++; |
| 898 | callout_overall = readconf_readtime(opt, 0, FALSE); |
| 899 | if (callout_overall < 0) |
| 900 | { |
| 901 | *log_msgptr = string_sprintf("bad time value in ACL condition " |
| 902 | "\"verify %s\"", arg); |
| 903 | return ERROR; |
| 904 | } |
| 905 | } |
| 906 | else /* Plain time is callout connect/command timeout */ |
| 907 | { |
| 908 | callout = readconf_readtime(opt, 0, FALSE); |
| 909 | if (callout < 0) |
| 910 | { |
| 911 | *log_msgptr = string_sprintf("bad time value in ACL condition " |
| 912 | "\"verify %s\"", arg); |
| 913 | return ERROR; |
| 914 | } |
| 915 | } |
| 916 | } |
| 917 | } |
| 918 | else |
| 919 | { |
| 920 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " |
| 921 | "ACL condition \"%s\"", arg); |
| 922 | return ERROR; |
| 923 | } |
| 924 | } |
| 925 | } |
| 926 | |
| 927 | /* Option not recognized */ |
| 928 | |
| 929 | else |
| 930 | { |
| 931 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " |
| 932 | "condition \"verify %s\"", ss, arg); |
| 933 | return ERROR; |
| 934 | } |
| 935 | } |
| 936 | |
| 937 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == |
| 938 | (vopt_callout_recipsender|vopt_callout_recippmaster)) |
| 939 | { |
| 940 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " |
| 941 | "for a recipient callout"; |
| 942 | return ERROR; |
| 943 | } |
| 944 | |
| 945 | /* Handle sender-in-header verification. Default the user message to the log |
| 946 | message if giving out verification details. */ |
| 947 | |
| 948 | if (verify_header_sender) |
| 949 | { |
| 950 | rc = verify_check_header_address(user_msgptr, log_msgptr, callout, |
| 951 | callout_overall, se_mailfrom, pm_mailfrom, verify_options); |
| 952 | if (smtp_return_error_details) |
| 953 | { |
| 954 | if (*user_msgptr == NULL && *log_msgptr != NULL) |
| 955 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); |
| 956 | if (rc == DEFER) acl_temp_details = TRUE; |
| 957 | } |
| 958 | } |
| 959 | |
| 960 | /* Handle a sender address. The default is to verify *the* sender address, but |
| 961 | optionally a different address can be given, for special requirements. If the |
| 962 | address is empty, we are dealing with a bounce message that has no sender, so |
| 963 | we cannot do any checking. If the real sender address gets rewritten during |
| 964 | verification (e.g. DNS widening), set the flag to stop it being rewritten again |
| 965 | during message reception. |
| 966 | |
| 967 | A list of verified "sender" addresses is kept to try to avoid doing to much |
| 968 | work repetitively when there are multiple recipients in a message and they all |
| 969 | require sender verification. However, when callouts are involved, it gets too |
| 970 | complicated because different recipients may require different callout options. |
| 971 | Therefore, we always do a full sender verify when any kind of callout is |
| 972 | specified. Caching elsewhere, for instance in the DNS resolver and in the |
| 973 | callout handling, should ensure that this is not terribly inefficient. */ |
| 974 | |
| 975 | else if (verify_sender_address != NULL) |
| 976 | { |
| 977 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) |
| 978 | != 0) |
| 979 | { |
| 980 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " |
| 981 | "sender verify callout"; |
| 982 | return ERROR; |
| 983 | } |
| 984 | |
| 985 | sender_vaddr = verify_checked_sender(verify_sender_address); |
| 986 | if (sender_vaddr != NULL && /* Previously checked */ |
| 987 | callout <= 0) /* No callout needed this time */ |
| 988 | { |
| 989 | /* If the "routed" flag is set, it means that routing worked before, so |
| 990 | this check can give OK (the saved return code value, if set, belongs to a |
| 991 | callout that was done previously). If the "routed" flag is not set, routing |
| 992 | must have failed, so we use the saved return code. */ |
| 993 | |
| 994 | if (testflag(sender_vaddr, af_verify_routed)) rc = OK; else |
| 995 | { |
| 996 | rc = sender_vaddr->special_action; |
| 997 | *basic_errno = sender_vaddr->basic_errno; |
| 998 | } |
| 999 | HDEBUG(D_acl) debug_printf("using cached sender verify result\n"); |
| 1000 | } |
| 1001 | |
| 1002 | /* Do a new verification, and cache the result. The cache is used to avoid |
| 1003 | verifying the sender multiple times for multiple RCPTs when callouts are not |
| 1004 | specified (see comments above). |
| 1005 | |
| 1006 | The cache is also used on failure to give details in response to the first |
| 1007 | RCPT that gets bounced for this reason. However, this can be suppressed by |
| 1008 | the no_details option, which sets the flag that says "this detail has already |
| 1009 | been sent". The cache normally contains just one address, but there may be |
| 1010 | more in esoteric circumstances. */ |
| 1011 | |
| 1012 | else |
| 1013 | { |
| 1014 | BOOL routed = TRUE; |
| 1015 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
| 1016 | if (no_details) setflag(sender_vaddr, af_sverify_told); |
| 1017 | if (verify_sender_address[0] != 0) |
| 1018 | { |
| 1019 | /* If this is the real sender address, save the unrewritten version |
| 1020 | for use later in receive. Otherwise, set a flag so that rewriting the |
| 1021 | sender in verify_address() does not update sender_address. */ |
| 1022 | |
| 1023 | if (verify_sender_address == sender_address) |
| 1024 | sender_address_unrewritten = sender_address; |
| 1025 | else |
| 1026 | verify_options |= vopt_fake_sender; |
| 1027 | |
| 1028 | /* The recipient, qualify, and expn options are never set in |
| 1029 | verify_options. */ |
| 1030 | |
| 1031 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, |
| 1032 | callout_overall, se_mailfrom, pm_mailfrom, &routed); |
| 1033 | |
| 1034 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); |
| 1035 | |
| 1036 | if (rc == OK) |
| 1037 | { |
| 1038 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) |
| 1039 | { |
| 1040 | DEBUG(D_acl) debug_printf("sender %s verified ok as %s\n", |
| 1041 | verify_sender_address, sender_vaddr->address); |
| 1042 | } |
| 1043 | else |
| 1044 | { |
| 1045 | DEBUG(D_acl) debug_printf("sender %s verified ok\n", |
| 1046 | verify_sender_address); |
| 1047 | } |
| 1048 | } |
| 1049 | else *basic_errno = sender_vaddr->basic_errno; |
| 1050 | } |
| 1051 | else rc = OK; /* Null sender */ |
| 1052 | |
| 1053 | /* Cache the result code */ |
| 1054 | |
| 1055 | if (routed) setflag(sender_vaddr, af_verify_routed); |
| 1056 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); |
| 1057 | sender_vaddr->special_action = rc; |
| 1058 | sender_vaddr->next = sender_verified_list; |
| 1059 | sender_verified_list = sender_vaddr; |
| 1060 | } |
| 1061 | } |
| 1062 | |
| 1063 | /* A recipient address just gets a straightforward verify; again we must handle |
| 1064 | the DEFER overrides. */ |
| 1065 | |
| 1066 | else |
| 1067 | { |
| 1068 | address_item addr2; |
| 1069 | |
| 1070 | /* We must use a copy of the address for verification, because it might |
| 1071 | get rewritten. */ |
| 1072 | |
| 1073 | addr2 = *addr; |
| 1074 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, |
| 1075 | callout_overall, se_mailfrom, pm_mailfrom, NULL); |
| 1076 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); |
| 1077 | *log_msgptr = addr2.message; |
| 1078 | *user_msgptr = addr2.user_message; |
| 1079 | *basic_errno = addr2.basic_errno; |
| 1080 | |
| 1081 | /* Make $address_data visible */ |
| 1082 | deliver_address_data = addr2.p.address_data; |
| 1083 | } |
| 1084 | |
| 1085 | /* We have a result from the relevant test. Handle defer overrides first. */ |
| 1086 | |
| 1087 | if (rc == DEFER && (defer_ok || |
| 1088 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) |
| 1089 | { |
| 1090 | HDEBUG(D_acl) debug_printf("verify defer overridden by %s\n", |
| 1091 | defer_ok? "defer_ok" : "callout_defer_ok"); |
| 1092 | rc = OK; |
| 1093 | } |
| 1094 | |
| 1095 | /* If we've failed a sender, set up a recipient message, and point |
| 1096 | sender_verified_failed to the address item that actually failed. */ |
| 1097 | |
| 1098 | if (rc != OK && verify_sender_address != NULL) |
| 1099 | { |
| 1100 | if (rc != DEFER) |
| 1101 | { |
| 1102 | *log_msgptr = *user_msgptr = US"Sender verify failed"; |
| 1103 | } |
| 1104 | else if (*basic_errno != ERRNO_CALLOUTDEFER) |
| 1105 | { |
| 1106 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; |
| 1107 | } |
| 1108 | else |
| 1109 | { |
| 1110 | *log_msgptr = US"Could not complete sender verify callout"; |
| 1111 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : |
| 1112 | *log_msgptr; |
| 1113 | } |
| 1114 | |
| 1115 | sender_verified_failed = sender_vaddr; |
| 1116 | } |
| 1117 | |
| 1118 | /* Verifying an address messes up the values of $domain and $local_part, |
| 1119 | so reset them before returning if this is a RCPT ACL. */ |
| 1120 | |
| 1121 | if (addr != NULL) |
| 1122 | { |
| 1123 | deliver_domain = addr->domain; |
| 1124 | deliver_localpart = addr->local_part; |
| 1125 | } |
| 1126 | return rc; |
| 1127 | |
| 1128 | /* Syntax errors in the verify argument come here. */ |
| 1129 | |
| 1130 | BAD_VERIFY: |
| 1131 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " |
| 1132 | "\"header_syntax\" or \"header_sender\" at start of ACL condition " |
| 1133 | "\"verify %s\"", arg); |
| 1134 | return ERROR; |
| 1135 | } |
| 1136 | |
| 1137 | |
| 1138 | |
| 1139 | |
| 1140 | /************************************************* |
| 1141 | * Check argument for control= modifier * |
| 1142 | *************************************************/ |
| 1143 | |
| 1144 | /* Called from acl_check_condition() below |
| 1145 | |
| 1146 | Arguments: |
| 1147 | arg the argument string for control= |
| 1148 | pptr set to point to the terminating character |
| 1149 | where which ACL we are in |
| 1150 | log_msgptr for error messages |
| 1151 | |
| 1152 | Returns: CONTROL_xxx value |
| 1153 | */ |
| 1154 | |
| 1155 | static int |
| 1156 | decode_control(uschar *arg, uschar **pptr, int where, uschar **log_msgptr) |
| 1157 | { |
| 1158 | int len; |
| 1159 | control_def *d; |
| 1160 | |
| 1161 | for (d = controls_list; |
| 1162 | d < controls_list + sizeof(controls_list)/sizeof(control_def); |
| 1163 | d++) |
| 1164 | { |
| 1165 | len = Ustrlen(d->name); |
| 1166 | if (Ustrncmp(d->name, arg, len) == 0) break; |
| 1167 | } |
| 1168 | |
| 1169 | if (d >= controls_list + sizeof(controls_list)/sizeof(control_def) || |
| 1170 | (arg[len] != 0 && (!d->has_option || arg[len] != '/'))) |
| 1171 | { |
| 1172 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); |
| 1173 | return CONTROL_ERROR; |
| 1174 | } |
| 1175 | |
| 1176 | *pptr = arg + len; |
| 1177 | return d->value; |
| 1178 | } |
| 1179 | |
| 1180 | |
| 1181 | |
| 1182 | /************************************************* |
| 1183 | * Handle conditions/modifiers on an ACL item * |
| 1184 | *************************************************/ |
| 1185 | |
| 1186 | /* Called from acl_check() below. |
| 1187 | |
| 1188 | Arguments: |
| 1189 | verb ACL verb |
| 1190 | cb ACL condition block - if NULL, result is OK |
| 1191 | where where called from |
| 1192 | addr the address being checked for RCPT, or NULL |
| 1193 | level the nesting level |
| 1194 | epp pointer to pass back TRUE if "endpass" encountered |
| 1195 | (applies only to "accept" and "discard") |
| 1196 | user_msgptr user message pointer |
| 1197 | log_msgptr log message pointer |
| 1198 | basic_errno pointer to where to put verify error |
| 1199 | |
| 1200 | Returns: OK - all conditions are met |
| 1201 | DISCARD - an "acl" condition returned DISCARD - only allowed |
| 1202 | for "accept" or "discard" verbs |
| 1203 | FAIL - at least one condition fails |
| 1204 | FAIL_DROP - an "acl" condition returned FAIL_DROP |
| 1205 | DEFER - can't tell at the moment (typically, lookup defer, |
| 1206 | but can be temporary callout problem) |
| 1207 | ERROR - ERROR from nested ACL or expansion failure or other |
| 1208 | error |
| 1209 | */ |
| 1210 | |
| 1211 | static int |
| 1212 | acl_check_condition(int verb, acl_condition_block *cb, int where, |
| 1213 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, |
| 1214 | uschar **log_msgptr, int *basic_errno) |
| 1215 | { |
| 1216 | uschar *user_message = NULL; |
| 1217 | uschar *log_message = NULL; |
| 1218 | uschar *p; |
| 1219 | int rc = OK; |
| 1220 | |
| 1221 | for (; cb != NULL; cb = cb->next) |
| 1222 | { |
| 1223 | uschar *arg; |
| 1224 | int control_type; |
| 1225 | |
| 1226 | /* The message and log_message items set up messages to be used in |
| 1227 | case of rejection. They are expanded later. */ |
| 1228 | |
| 1229 | if (cb->type == ACLC_MESSAGE) |
| 1230 | { |
| 1231 | user_message = cb->arg; |
| 1232 | continue; |
| 1233 | } |
| 1234 | |
| 1235 | if (cb->type == ACLC_LOG_MESSAGE) |
| 1236 | { |
| 1237 | log_message = cb->arg; |
| 1238 | continue; |
| 1239 | } |
| 1240 | |
| 1241 | /* The endpass "condition" just sets a flag to show it occurred. This is |
| 1242 | checked at compile time to be on an "accept" or "discard" item. */ |
| 1243 | |
| 1244 | if (cb->type == ACLC_ENDPASS) |
| 1245 | { |
| 1246 | *epp = TRUE; |
| 1247 | continue; |
| 1248 | } |
| 1249 | |
| 1250 | /* For other conditions and modifiers, the argument is expanded now for some |
| 1251 | of them, but not for all, because expansion happens down in some lower level |
| 1252 | checking functions in some cases. */ |
| 1253 | |
| 1254 | if (cond_expand_at_top[cb->type]) |
| 1255 | { |
| 1256 | arg = expand_string(cb->arg); |
| 1257 | if (arg == NULL) |
| 1258 | { |
| 1259 | if (expand_string_forcedfail) continue; |
| 1260 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", |
| 1261 | cb->arg, expand_string_message); |
| 1262 | return search_find_defer? DEFER : ERROR; |
| 1263 | } |
| 1264 | } |
| 1265 | else arg = cb->arg; |
| 1266 | |
| 1267 | /* Show condition, and expanded condition if it's different */ |
| 1268 | |
| 1269 | HDEBUG(D_acl) |
| 1270 | { |
| 1271 | int lhswidth = 0; |
| 1272 | debug_printf("check %s%s %n", |
| 1273 | (!cond_modifiers[cb->type] && cb->u.negated)? "!":"", |
| 1274 | conditions[cb->type], &lhswidth); |
| 1275 | |
| 1276 | if (cb->type == ACLC_SET) |
| 1277 | { |
| 1278 | int n = cb->u.varnumber; |
| 1279 | int t = (n < ACL_C_MAX)? 'c' : 'm'; |
| 1280 | if (n >= ACL_C_MAX) n -= ACL_C_MAX; |
| 1281 | debug_printf("acl_%c%d ", t, n); |
| 1282 | lhswidth += 7; |
| 1283 | } |
| 1284 | |
| 1285 | debug_printf("= %s\n", cb->arg); |
| 1286 | |
| 1287 | if (arg != cb->arg) |
| 1288 | debug_printf("%.*s= %s\n", lhswidth, |
| 1289 | US" ", CS arg); |
| 1290 | } |
| 1291 | |
| 1292 | /* Check that this condition makes sense at this time */ |
| 1293 | |
| 1294 | if ((cond_forbids[cb->type] & (1 << where)) != 0) |
| 1295 | { |
| 1296 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", |
| 1297 | cond_modifiers[cb->type]? "use" : "test", |
| 1298 | conditions[cb->type], acl_wherenames[where]); |
| 1299 | return ERROR; |
| 1300 | } |
| 1301 | |
| 1302 | /* Run the appropriate test for each condition, or take the appropriate |
| 1303 | action for the remaining modifiers. */ |
| 1304 | |
| 1305 | switch(cb->type) |
| 1306 | { |
| 1307 | /* A nested ACL that returns "discard" makes sense only for an "accept" or |
| 1308 | "discard" verb. */ |
| 1309 | |
| 1310 | case ACLC_ACL: |
| 1311 | rc = acl_check_internal(where, addr, arg, level+1, user_msgptr, log_msgptr); |
| 1312 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) |
| 1313 | { |
| 1314 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " |
| 1315 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", |
| 1316 | verbs[verb]); |
| 1317 | return ERROR; |
| 1318 | } |
| 1319 | break; |
| 1320 | |
| 1321 | case ACLC_AUTHENTICATED: |
| 1322 | rc = (sender_host_authenticated == NULL)? FAIL : |
| 1323 | match_isinlist(sender_host_authenticated, &arg, 0, NULL, NULL, MCL_STRING, |
| 1324 | TRUE, NULL); |
| 1325 | break; |
| 1326 | |
| 1327 | case ACLC_CONDITION: |
| 1328 | if (Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ |
| 1329 | rc = (Uatoi(arg) == 0)? FAIL : OK; |
| 1330 | else |
| 1331 | rc = (strcmpic(arg, US"no") == 0 || |
| 1332 | strcmpic(arg, US"false") == 0)? FAIL : |
| 1333 | (strcmpic(arg, US"yes") == 0 || |
| 1334 | strcmpic(arg, US"true") == 0)? OK : DEFER; |
| 1335 | if (rc == DEFER) |
| 1336 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); |
| 1337 | break; |
| 1338 | |
| 1339 | case ACLC_CONTROL: |
| 1340 | control_type = decode_control(arg, &p, where, log_msgptr); |
| 1341 | |
| 1342 | /* Check this control makes sense at this time */ |
| 1343 | |
| 1344 | if ((control_forbids[control_type] & (1 << where)) != 0) |
| 1345 | { |
| 1346 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", |
| 1347 | controls[control_type], acl_wherenames[where]); |
| 1348 | return ERROR; |
| 1349 | } |
| 1350 | |
| 1351 | switch(control_type) |
| 1352 | { |
| 1353 | case CONTROL_ERROR: |
| 1354 | return ERROR; |
| 1355 | |
| 1356 | case CONTROL_CASEFUL_LOCAL_PART: |
| 1357 | deliver_localpart = addr->cc_local_part; |
| 1358 | break; |
| 1359 | |
| 1360 | case CONTROL_CASELOWER_LOCAL_PART: |
| 1361 | deliver_localpart = addr->lc_local_part; |
| 1362 | break; |
| 1363 | |
| 1364 | case CONTROL_ENFORCE_SYNC: |
| 1365 | smtp_enforce_sync = TRUE; |
| 1366 | break; |
| 1367 | |
| 1368 | case CONTROL_NO_ENFORCE_SYNC: |
| 1369 | smtp_enforce_sync = FALSE; |
| 1370 | break; |
| 1371 | |
| 1372 | case CONTROL_NO_MULTILINE: |
| 1373 | no_multiline_responses = TRUE; |
| 1374 | break; |
| 1375 | |
| 1376 | case CONTROL_FREEZE: |
| 1377 | deliver_freeze = TRUE; |
| 1378 | deliver_frozen_at = time(NULL); |
| 1379 | break; |
| 1380 | |
| 1381 | case CONTROL_QUEUE_ONLY: |
| 1382 | queue_only_policy = TRUE; |
| 1383 | break; |
| 1384 | |
| 1385 | case CONTROL_SUBMISSION: |
| 1386 | submission_mode = TRUE; |
| 1387 | while (*p == '/') |
| 1388 | { |
| 1389 | if (Ustrncmp(p, "/sender_retain", 14) == 0) |
| 1390 | { |
| 1391 | p += 14; |
| 1392 | active_local_sender_retain = TRUE; |
| 1393 | active_local_from_check = FALSE; |
| 1394 | } |
| 1395 | else if (Ustrncmp(p, "/domain=", 8) == 0) |
| 1396 | { |
| 1397 | uschar *pp = p + 8; |
| 1398 | while (*pp != 0 && *pp != '/') pp++; |
| 1399 | submission_domain = string_copyn(p+8, pp-p); |
| 1400 | p = pp; |
| 1401 | } |
| 1402 | else break; |
| 1403 | } |
| 1404 | if (*p != 0) |
| 1405 | { |
| 1406 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); |
| 1407 | return ERROR; |
| 1408 | } |
| 1409 | break; |
| 1410 | } |
| 1411 | break; |
| 1412 | |
| 1413 | case ACLC_DELAY: |
| 1414 | { |
| 1415 | int delay = readconf_readtime(arg, 0, FALSE); |
| 1416 | if (delay < 0) |
| 1417 | { |
| 1418 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " |
| 1419 | "modifier: \"%s\" is not a time value", arg); |
| 1420 | return ERROR; |
| 1421 | } |
| 1422 | else |
| 1423 | { |
| 1424 | HDEBUG(D_acl) debug_printf("delay modifier requests %d-second delay\n", |
| 1425 | delay); |
| 1426 | if (host_checking) |
| 1427 | { |
| 1428 | HDEBUG(D_acl) |
| 1429 | debug_printf("delay skipped in -bh checking mode\n"); |
| 1430 | } |
| 1431 | else sleep(delay); |
| 1432 | } |
| 1433 | } |
| 1434 | break; |
| 1435 | |
| 1436 | case ACLC_DNSLISTS: |
| 1437 | rc = verify_check_dnsbl(&arg); |
| 1438 | break; |
| 1439 | |
| 1440 | case ACLC_DOMAINS: |
| 1441 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, |
| 1442 | addr->domain_cache, MCL_DOMAIN, TRUE, &deliver_domain_data); |
| 1443 | break; |
| 1444 | |
| 1445 | /* The value in tls_cipher is the full cipher name, for example, |
| 1446 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the |
| 1447 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know |
| 1448 | what may in practice come out of the SSL library - which at the time of |
| 1449 | writing is poorly documented. */ |
| 1450 | |
| 1451 | case ACLC_ENCRYPTED: |
| 1452 | if (tls_cipher == NULL) rc = FAIL; else |
| 1453 | { |
| 1454 | uschar *endcipher = NULL; |
| 1455 | uschar *cipher = Ustrchr(tls_cipher, ':'); |
| 1456 | if (cipher == NULL) cipher = tls_cipher; else |
| 1457 | { |
| 1458 | endcipher = Ustrchr(++cipher, ':'); |
| 1459 | if (endcipher != NULL) *endcipher = 0; |
| 1460 | } |
| 1461 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); |
| 1462 | if (endcipher != NULL) *endcipher = ':'; |
| 1463 | } |
| 1464 | break; |
| 1465 | |
| 1466 | /* Use verify_check_this_host() instead of verify_check_host() so that |
| 1467 | we can pass over &host_data to catch any looked up data. Once it has been |
| 1468 | set, it retains its value so that it's still there if another ACL verb |
| 1469 | comes through here and uses the cache. However, we must put it into |
| 1470 | permanent store in case it is also expected to be used in a subsequent |
| 1471 | message in the same SMTP connection. */ |
| 1472 | |
| 1473 | case ACLC_HOSTS: |
| 1474 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, |
| 1475 | (sender_host_address == NULL)? US"" : sender_host_address, &host_data); |
| 1476 | if (host_data != NULL) host_data = string_copy_malloc(host_data); |
| 1477 | break; |
| 1478 | |
| 1479 | case ACLC_LOCAL_PARTS: |
| 1480 | rc = match_isinlist(addr->cc_local_part, &arg, 0, |
| 1481 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, |
| 1482 | &deliver_localpart_data); |
| 1483 | break; |
| 1484 | |
| 1485 | case ACLC_LOGWRITE: |
| 1486 | { |
| 1487 | int logbits = 0; |
| 1488 | uschar *s = arg; |
| 1489 | if (*s == ':') |
| 1490 | { |
| 1491 | s++; |
| 1492 | while (*s != ':') |
| 1493 | { |
| 1494 | if (Ustrncmp(s, "main", 4) == 0) |
| 1495 | { logbits |= LOG_MAIN; s += 4; } |
| 1496 | else if (Ustrncmp(s, "panic", 5) == 0) |
| 1497 | { logbits |= LOG_PANIC; s += 5; } |
| 1498 | else if (Ustrncmp(s, "reject", 6) == 0) |
| 1499 | { logbits |= LOG_REJECT; s += 6; } |
| 1500 | else |
| 1501 | { |
| 1502 | logbits = LOG_MAIN|LOG_PANIC; |
| 1503 | s = string_sprintf(":unknown log name in \"%s\" in " |
| 1504 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); |
| 1505 | } |
| 1506 | if (*s == ',') s++; |
| 1507 | } |
| 1508 | s++; |
| 1509 | } |
| 1510 | while (isspace(*s)) s++; |
| 1511 | if (logbits == 0) logbits = LOG_MAIN; |
| 1512 | log_write(0, logbits, "%s", string_printing(s)); |
| 1513 | } |
| 1514 | break; |
| 1515 | |
| 1516 | case ACLC_RECIPIENTS: |
| 1517 | rc = match_address_list(addr->address, TRUE, TRUE, &arg, NULL, -1, 0, |
| 1518 | &recipient_data); |
| 1519 | break; |
| 1520 | |
| 1521 | case ACLC_SENDER_DOMAINS: |
| 1522 | { |
| 1523 | uschar *sdomain; |
| 1524 | sdomain = Ustrrchr(sender_address, '@'); |
| 1525 | sdomain = (sdomain == NULL)? US"" : sdomain + 1; |
| 1526 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, |
| 1527 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); |
| 1528 | } |
| 1529 | break; |
| 1530 | |
| 1531 | case ACLC_SENDERS: |
| 1532 | rc = match_address_list(sender_address, TRUE, TRUE, &arg, |
| 1533 | sender_address_cache, -1, 0, &sender_data); |
| 1534 | break; |
| 1535 | |
| 1536 | /* Connection variables must persist forever */ |
| 1537 | |
| 1538 | case ACLC_SET: |
| 1539 | { |
| 1540 | int old_pool = store_pool; |
| 1541 | if (cb->u.varnumber < ACL_C_MAX) store_pool = POOL_PERM; |
| 1542 | acl_var[cb->u.varnumber] = string_copy(arg); |
| 1543 | store_pool = old_pool; |
| 1544 | } |
| 1545 | break; |
| 1546 | |
| 1547 | /* If the verb is WARN, discard any user message from verification, because |
| 1548 | such messages are SMTP responses, not header additions. The latter come |
| 1549 | only from explicit "message" modifiers. */ |
| 1550 | |
| 1551 | case ACLC_VERIFY: |
| 1552 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); |
| 1553 | if (verb == ACL_WARN) *user_msgptr = NULL; |
| 1554 | break; |
| 1555 | |
| 1556 | default: |
| 1557 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " |
| 1558 | "condition %d", cb->type); |
| 1559 | break; |
| 1560 | } |
| 1561 | |
| 1562 | /* If a condition was negated, invert OK/FAIL. */ |
| 1563 | |
| 1564 | if (!cond_modifiers[cb->type] && cb->u.negated) |
| 1565 | { |
| 1566 | if (rc == OK) rc = FAIL; |
| 1567 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; |
| 1568 | } |
| 1569 | |
| 1570 | if (rc != OK) break; /* Conditions loop */ |
| 1571 | } |
| 1572 | |
| 1573 | |
| 1574 | /* If the result is the one for which "message" and/or "log_message" are used, |
| 1575 | handle the values of these options. Most verbs have but a single return for |
| 1576 | which the messages are relevant, but for "discard", it's useful to have the log |
| 1577 | message both when it succeeds and when it fails. Also, for an "accept" that |
| 1578 | appears in a QUIT ACL, we want to handle the user message. Since only "accept" |
| 1579 | and "warn" are permitted in that ACL, we don't need to test the verb. |
| 1580 | |
| 1581 | These modifiers act in different ways: |
| 1582 | |
| 1583 | "message" is a user message that will be included in an SMTP response. Unless |
| 1584 | it is empty, it overrides any previously set user message. |
| 1585 | |
| 1586 | "log_message" is a non-user message, and it adds to any existing non-user |
| 1587 | message that is already set. |
| 1588 | |
| 1589 | If there isn't a log message set, we make it the same as the user message. */ |
| 1590 | |
| 1591 | if (((rc == FAIL_DROP)? FAIL : rc) == msgcond[verb] || |
| 1592 | (verb == ACL_DISCARD && rc == OK) || |
| 1593 | (where == ACL_WHERE_QUIT)) |
| 1594 | { |
| 1595 | uschar *expmessage; |
| 1596 | |
| 1597 | /* If the verb is "warn", messages generated by conditions (verification or |
| 1598 | nested ACLs) are discarded. Only messages specified at this level are used. |
| 1599 | However, the value of an existing message is available in $acl_verify_message |
| 1600 | during expansions. */ |
| 1601 | |
| 1602 | uschar *old_user_msgptr = *user_msgptr; |
| 1603 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; |
| 1604 | |
| 1605 | if (verb == ACL_WARN) *log_msgptr = *user_msgptr = NULL; |
| 1606 | |
| 1607 | if (user_message != NULL) |
| 1608 | { |
| 1609 | acl_verify_message = old_user_msgptr; |
| 1610 | expmessage = expand_string(user_message); |
| 1611 | if (expmessage == NULL) |
| 1612 | { |
| 1613 | if (!expand_string_forcedfail) |
| 1614 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", |
| 1615 | user_message, expand_string_message); |
| 1616 | } |
| 1617 | else if (expmessage[0] != 0) *user_msgptr = expmessage; |
| 1618 | } |
| 1619 | |
| 1620 | if (log_message != NULL) |
| 1621 | { |
| 1622 | acl_verify_message = old_log_msgptr; |
| 1623 | expmessage = expand_string(log_message); |
| 1624 | if (expmessage == NULL) |
| 1625 | { |
| 1626 | if (!expand_string_forcedfail) |
| 1627 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", |
| 1628 | log_message, expand_string_message); |
| 1629 | } |
| 1630 | else if (expmessage[0] != 0) |
| 1631 | { |
| 1632 | *log_msgptr = (*log_msgptr == NULL)? expmessage : |
| 1633 | string_sprintf("%s: %s", expmessage, *log_msgptr); |
| 1634 | } |
| 1635 | } |
| 1636 | |
| 1637 | /* If no log message, default it to the user message */ |
| 1638 | |
| 1639 | if (*log_msgptr == NULL) *log_msgptr = *user_msgptr; |
| 1640 | } |
| 1641 | |
| 1642 | acl_verify_message = NULL; |
| 1643 | return rc; |
| 1644 | } |
| 1645 | |
| 1646 | |
| 1647 | |
| 1648 | |
| 1649 | |
| 1650 | /************************************************* |
| 1651 | * Get line from a literal ACL * |
| 1652 | *************************************************/ |
| 1653 | |
| 1654 | /* This function is passed to acl_read() in order to extract individual lines |
| 1655 | of a literal ACL, which we access via static pointers. We can destroy the |
| 1656 | contents because this is called only once (the compiled ACL is remembered). |
| 1657 | |
| 1658 | This code is intended to treat the data in the same way as lines in the main |
| 1659 | Exim configuration file. That is: |
| 1660 | |
| 1661 | . Leading spaces are ignored. |
| 1662 | |
| 1663 | . A \ at the end of a line is a continuation - trailing spaces after the \ |
| 1664 | are permitted (this is because I don't believe in making invisible things |
| 1665 | significant). Leading spaces on the continued part of a line are ignored. |
| 1666 | |
| 1667 | . Physical lines starting (significantly) with # are totally ignored, and |
| 1668 | may appear within a sequence of backslash-continued lines. |
| 1669 | |
| 1670 | . Blank lines are ignored, but will end a sequence of continuations. |
| 1671 | |
| 1672 | Arguments: none |
| 1673 | Returns: a pointer to the next line |
| 1674 | */ |
| 1675 | |
| 1676 | |
| 1677 | static uschar *acl_text; /* Current pointer in the text */ |
| 1678 | static uschar *acl_text_end; /* Points one past the terminating '0' */ |
| 1679 | |
| 1680 | |
| 1681 | static uschar * |
| 1682 | acl_getline(void) |
| 1683 | { |
| 1684 | uschar *yield; |
| 1685 | |
| 1686 | /* This loop handles leading blank lines and comments. */ |
| 1687 | |
| 1688 | for(;;) |
| 1689 | { |
| 1690 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ |
| 1691 | if (*acl_text == 0) return NULL; /* No more data */ |
| 1692 | yield = acl_text; /* Potential data line */ |
| 1693 | |
| 1694 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; |
| 1695 | |
| 1696 | /* If we hit the end before a newline, we have the whole logical line. If |
| 1697 | it's a comment, there's no more data to be given. Otherwise, yield it. */ |
| 1698 | |
| 1699 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; |
| 1700 | |
| 1701 | /* After reaching a newline, end this loop if the physical line does not |
| 1702 | start with '#'. If it does, it's a comment, and the loop continues. */ |
| 1703 | |
| 1704 | if (*yield != '#') break; |
| 1705 | } |
| 1706 | |
| 1707 | /* This loop handles continuations. We know we have some real data, ending in |
| 1708 | newline. See if there is a continuation marker at the end (ignoring trailing |
| 1709 | white space). We know that *yield is not white space, so no need to test for |
| 1710 | cont > yield in the backwards scanning loop. */ |
| 1711 | |
| 1712 | for(;;) |
| 1713 | { |
| 1714 | uschar *cont; |
| 1715 | for (cont = acl_text - 1; isspace(*cont); cont--); |
| 1716 | |
| 1717 | /* If no continuation follows, we are done. Mark the end of the line and |
| 1718 | return it. */ |
| 1719 | |
| 1720 | if (*cont != '\\') |
| 1721 | { |
| 1722 | *acl_text++ = 0; |
| 1723 | return yield; |
| 1724 | } |
| 1725 | |
| 1726 | /* We have encountered a continuation. Skip over whitespace at the start of |
| 1727 | the next line, and indeed the whole of the next line or lines if they are |
| 1728 | comment lines. */ |
| 1729 | |
| 1730 | for (;;) |
| 1731 | { |
| 1732 | while (*(++acl_text) == ' ' || *acl_text == '\t'); |
| 1733 | if (*acl_text != '#') break; |
| 1734 | while (*(++acl_text) != 0 && *acl_text != '\n'); |
| 1735 | } |
| 1736 | |
| 1737 | /* We have the start of a continuation line. Move all the rest of the data |
| 1738 | to join onto the previous line, and then find its end. If the end is not a |
| 1739 | newline, we are done. Otherwise loop to look for another continuation. */ |
| 1740 | |
| 1741 | memmove(cont, acl_text, acl_text_end - acl_text); |
| 1742 | acl_text_end -= acl_text - cont; |
| 1743 | acl_text = cont; |
| 1744 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; |
| 1745 | if (*acl_text == 0) return yield; |
| 1746 | } |
| 1747 | |
| 1748 | /* Control does not reach here */ |
| 1749 | } |
| 1750 | |
| 1751 | |
| 1752 | |
| 1753 | |
| 1754 | |
| 1755 | /************************************************* |
| 1756 | * Check access using an ACL * |
| 1757 | *************************************************/ |
| 1758 | |
| 1759 | /* This function is called from address_check. It may recurse via |
| 1760 | acl_check_condition() - hence the use of a level to stop looping. The ACL is |
| 1761 | passed as a string which is expanded. A forced failure implies no access check |
| 1762 | is required. If the result is a single word, it is taken as the name of an ACL |
| 1763 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL |
| 1764 | text, complete with newlines, and parsed as such. In both cases, the ACL check |
| 1765 | is then run. This function uses an auxiliary function for acl_read() to call |
| 1766 | for reading individual lines of a literal ACL. This is acl_getline(), which |
| 1767 | appears immediately above. |
| 1768 | |
| 1769 | Arguments: |
| 1770 | where where called from |
| 1771 | addr address item when called from RCPT; otherwise NULL |
| 1772 | s the input string; NULL is the same as an empty ACL => DENY |
| 1773 | level the nesting level |
| 1774 | user_msgptr where to put a user error (for SMTP response) |
| 1775 | log_msgptr where to put a logging message (not for SMTP response) |
| 1776 | |
| 1777 | Returns: OK access is granted |
| 1778 | DISCARD access is apparently granted... |
| 1779 | FAIL access is denied |
| 1780 | FAIL_DROP access is denied; drop the connection |
| 1781 | DEFER can't tell at the moment |
| 1782 | ERROR disaster |
| 1783 | */ |
| 1784 | |
| 1785 | static int |
| 1786 | acl_check_internal(int where, address_item *addr, uschar *s, int level, |
| 1787 | uschar **user_msgptr, uschar **log_msgptr) |
| 1788 | { |
| 1789 | int fd = -1; |
| 1790 | acl_block *acl = NULL; |
| 1791 | uschar *acl_name = US"inline ACL"; |
| 1792 | uschar *ss; |
| 1793 | |
| 1794 | /* Catch configuration loops */ |
| 1795 | |
| 1796 | if (level > 20) |
| 1797 | { |
| 1798 | *log_msgptr = US"ACL nested too deep: possible loop"; |
| 1799 | return ERROR; |
| 1800 | } |
| 1801 | |
| 1802 | if (s == NULL) |
| 1803 | { |
| 1804 | HDEBUG(D_acl) debug_printf("ACL is NULL: implicit DENY\n"); |
| 1805 | return FAIL; |
| 1806 | } |
| 1807 | |
| 1808 | /* At top level, we expand the incoming string. At lower levels, it has already |
| 1809 | been expanded as part of condition processing. */ |
| 1810 | |
| 1811 | if (level == 0) |
| 1812 | { |
| 1813 | ss = expand_string(s); |
| 1814 | if (ss == NULL) |
| 1815 | { |
| 1816 | if (expand_string_forcedfail) return OK; |
| 1817 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, |
| 1818 | expand_string_message); |
| 1819 | return ERROR; |
| 1820 | } |
| 1821 | } |
| 1822 | else ss = s; |
| 1823 | |
| 1824 | while (isspace(*ss))ss++; |
| 1825 | |
| 1826 | /* If we can't find a named ACL, the default is to parse it as an inline one. |
| 1827 | (Unless it begins with a slash; non-existent files give rise to an error.) */ |
| 1828 | |
| 1829 | acl_text = ss; |
| 1830 | |
| 1831 | /* Handle the case of a string that does not contain any spaces. Look for a |
| 1832 | named ACL among those read from the configuration, or a previously read file. |
| 1833 | It is possible that the pointer to the ACL is NULL if the configuration |
| 1834 | contains a name with no data. If not found, and the text begins with '/', |
| 1835 | read an ACL from a file, and save it so it can be re-used. */ |
| 1836 | |
| 1837 | if (Ustrchr(ss, ' ') == NULL) |
| 1838 | { |
| 1839 | tree_node *t = tree_search(acl_anchor, ss); |
| 1840 | if (t != NULL) |
| 1841 | { |
| 1842 | acl = (acl_block *)(t->data.ptr); |
| 1843 | if (acl == NULL) |
| 1844 | { |
| 1845 | HDEBUG(D_acl) debug_printf("ACL \"%s\" is empty: implicit DENY\n", ss); |
| 1846 | return FAIL; |
| 1847 | } |
| 1848 | acl_name = string_sprintf("ACL \"%s\"", ss); |
| 1849 | HDEBUG(D_acl) debug_printf("using ACL \"%s\"\n", ss); |
| 1850 | } |
| 1851 | |
| 1852 | else if (*ss == '/') |
| 1853 | { |
| 1854 | struct stat statbuf; |
| 1855 | fd = Uopen(ss, O_RDONLY, 0); |
| 1856 | if (fd < 0) |
| 1857 | { |
| 1858 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, |
| 1859 | strerror(errno)); |
| 1860 | return ERROR; |
| 1861 | } |
| 1862 | |
| 1863 | if (fstat(fd, &statbuf) != 0) |
| 1864 | { |
| 1865 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, |
| 1866 | strerror(errno)); |
| 1867 | return ERROR; |
| 1868 | } |
| 1869 | |
| 1870 | acl_text = store_get(statbuf.st_size + 1); |
| 1871 | acl_text_end = acl_text + statbuf.st_size + 1; |
| 1872 | |
| 1873 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) |
| 1874 | { |
| 1875 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", |
| 1876 | ss, strerror(errno)); |
| 1877 | return ERROR; |
| 1878 | } |
| 1879 | acl_text[statbuf.st_size] = 0; |
| 1880 | close(fd); |
| 1881 | |
| 1882 | acl_name = string_sprintf("ACL \"%s\"", ss); |
| 1883 | HDEBUG(D_acl) debug_printf("read ACL from file %s\n", ss); |
| 1884 | } |
| 1885 | } |
| 1886 | |
| 1887 | /* Parse an ACL that is still in text form. If it came from a file, remember it |
| 1888 | in the ACL tree, having read it into the POOL_PERM store pool so that it |
| 1889 | persists between multiple messages. */ |
| 1890 | |
| 1891 | if (acl == NULL) |
| 1892 | { |
| 1893 | int old_pool = store_pool; |
| 1894 | if (fd >= 0) store_pool = POOL_PERM; |
| 1895 | acl = acl_read(acl_getline, log_msgptr); |
| 1896 | store_pool = old_pool; |
| 1897 | if (acl == NULL && *log_msgptr != NULL) return ERROR; |
| 1898 | if (fd >= 0) |
| 1899 | { |
| 1900 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); |
| 1901 | Ustrcpy(t->name, ss); |
| 1902 | t->data.ptr = acl; |
| 1903 | (void)tree_insertnode(&acl_anchor, t); |
| 1904 | } |
| 1905 | } |
| 1906 | |
| 1907 | /* Now we have an ACL to use. It's possible it may be NULL. */ |
| 1908 | |
| 1909 | while (acl != NULL) |
| 1910 | { |
| 1911 | int cond; |
| 1912 | int basic_errno = 0; |
| 1913 | BOOL endpass_seen = FALSE; |
| 1914 | |
| 1915 | *log_msgptr = *user_msgptr = NULL; |
| 1916 | acl_temp_details = FALSE; |
| 1917 | |
| 1918 | if (where == ACL_WHERE_QUIT && |
| 1919 | acl->verb != ACL_ACCEPT && |
| 1920 | acl->verb != ACL_WARN) |
| 1921 | { |
| 1922 | *log_msgptr = string_sprintf("\"%s\" is not allowed in a QUIT ACL", |
| 1923 | verbs[acl->verb]); |
| 1924 | return ERROR; |
| 1925 | } |
| 1926 | |
| 1927 | HDEBUG(D_acl) debug_printf("processing \"%s\"\n", verbs[acl->verb]); |
| 1928 | |
| 1929 | /* Clear out any search error message from a previous check before testing |
| 1930 | this condition. */ |
| 1931 | |
| 1932 | search_error_message = NULL; |
| 1933 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, level, |
| 1934 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); |
| 1935 | |
| 1936 | /* Handle special returns: DEFER causes a return except on a WARN verb; |
| 1937 | ERROR always causes a return. */ |
| 1938 | |
| 1939 | switch (cond) |
| 1940 | { |
| 1941 | case DEFER: |
| 1942 | HDEBUG(D_acl) debug_printf("%s: condition test deferred\n", verbs[acl->verb]); |
| 1943 | if (basic_errno != ERRNO_CALLOUTDEFER) |
| 1944 | { |
| 1945 | if (search_error_message != NULL && *search_error_message != 0) |
| 1946 | *log_msgptr = search_error_message; |
| 1947 | if (smtp_return_error_details) acl_temp_details = TRUE; |
| 1948 | } |
| 1949 | else |
| 1950 | { |
| 1951 | acl_temp_details = TRUE; |
| 1952 | } |
| 1953 | if (acl->verb != ACL_WARN) return DEFER; |
| 1954 | break; |
| 1955 | |
| 1956 | default: /* Paranoia */ |
| 1957 | case ERROR: |
| 1958 | HDEBUG(D_acl) debug_printf("%s: condition test error\n", verbs[acl->verb]); |
| 1959 | return ERROR; |
| 1960 | |
| 1961 | case OK: |
| 1962 | HDEBUG(D_acl) debug_printf("%s: condition test succeeded\n", |
| 1963 | verbs[acl->verb]); |
| 1964 | break; |
| 1965 | |
| 1966 | case FAIL: |
| 1967 | HDEBUG(D_acl) debug_printf("%s: condition test failed\n", verbs[acl->verb]); |
| 1968 | break; |
| 1969 | |
| 1970 | /* DISCARD and DROP can happen only from a nested ACL condition, and |
| 1971 | DISCARD can happen only for an "accept" or "discard" verb. */ |
| 1972 | |
| 1973 | case DISCARD: |
| 1974 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\"\n", |
| 1975 | verbs[acl->verb]); |
| 1976 | break; |
| 1977 | |
| 1978 | case FAIL_DROP: |
| 1979 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\"\n", |
| 1980 | verbs[acl->verb]); |
| 1981 | break; |
| 1982 | } |
| 1983 | |
| 1984 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of |
| 1985 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and |
| 1986 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ |
| 1987 | |
| 1988 | switch(acl->verb) |
| 1989 | { |
| 1990 | case ACL_ACCEPT: |
| 1991 | if (cond == OK || cond == DISCARD) return cond; |
| 1992 | if (endpass_seen) |
| 1993 | { |
| 1994 | HDEBUG(D_acl) debug_printf("accept: endpass encountered - denying access\n"); |
| 1995 | return cond; |
| 1996 | } |
| 1997 | break; |
| 1998 | |
| 1999 | case ACL_DEFER: |
| 2000 | if (cond == OK) |
| 2001 | { |
| 2002 | acl_temp_details = TRUE; |
| 2003 | return DEFER; |
| 2004 | } |
| 2005 | break; |
| 2006 | |
| 2007 | case ACL_DENY: |
| 2008 | if (cond == OK) return FAIL; |
| 2009 | break; |
| 2010 | |
| 2011 | case ACL_DISCARD: |
| 2012 | if (cond == OK || cond == DISCARD) return DISCARD; |
| 2013 | if (endpass_seen) |
| 2014 | { |
| 2015 | HDEBUG(D_acl) debug_printf("discard: endpass encountered - denying access\n"); |
| 2016 | return cond; |
| 2017 | } |
| 2018 | break; |
| 2019 | |
| 2020 | case ACL_DROP: |
| 2021 | if (cond == OK) return FAIL_DROP; |
| 2022 | break; |
| 2023 | |
| 2024 | case ACL_REQUIRE: |
| 2025 | if (cond != OK) return cond; |
| 2026 | break; |
| 2027 | |
| 2028 | case ACL_WARN: |
| 2029 | if (cond == OK) |
| 2030 | acl_warn(where, *user_msgptr, *log_msgptr); |
| 2031 | else if (cond == DEFER) |
| 2032 | acl_warn(where, NULL, string_sprintf("ACL \"warn\" statement skipped: " |
| 2033 | "condition test deferred: %s", |
| 2034 | (*log_msgptr == NULL)? US"" : *log_msgptr)); |
| 2035 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
| 2036 | break; |
| 2037 | |
| 2038 | default: |
| 2039 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", |
| 2040 | acl->verb); |
| 2041 | break; |
| 2042 | } |
| 2043 | |
| 2044 | /* Pass to the next ACL item */ |
| 2045 | |
| 2046 | acl = acl->next; |
| 2047 | } |
| 2048 | |
| 2049 | /* We have reached the end of the ACL. This is an implicit DENY. */ |
| 2050 | |
| 2051 | HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name); |
| 2052 | return FAIL; |
| 2053 | } |
| 2054 | |
| 2055 | |
| 2056 | /************************************************* |
| 2057 | * Check access using an ACL * |
| 2058 | *************************************************/ |
| 2059 | |
| 2060 | /* This is the external interface for ACL checks. It sets up an address and the |
| 2061 | expansions for $domain and $local_part when called after RCPT, then calls |
| 2062 | acl_check_internal() to do the actual work. |
| 2063 | |
| 2064 | Arguments: |
| 2065 | where ACL_WHERE_xxxx indicating where called from |
| 2066 | data_string RCPT address, or SMTP command argument, or NULL |
| 2067 | s the input string; NULL is the same as an empty ACL => DENY |
| 2068 | user_msgptr where to put a user error (for SMTP response) |
| 2069 | log_msgptr where to put a logging message (not for SMTP response) |
| 2070 | |
| 2071 | Returns: OK access is granted by an ACCEPT verb |
| 2072 | DISCARD access is granted by a DISCARD verb |
| 2073 | FAIL access is denied |
| 2074 | FAIL_DROP access is denied; drop the connection |
| 2075 | DEFER can't tell at the moment |
| 2076 | ERROR disaster |
| 2077 | */ |
| 2078 | |
| 2079 | int |
| 2080 | acl_check(int where, uschar *data_string, uschar *s, uschar **user_msgptr, |
| 2081 | uschar **log_msgptr) |
| 2082 | { |
| 2083 | int rc; |
| 2084 | address_item adb; |
| 2085 | address_item *addr; |
| 2086 | |
| 2087 | *user_msgptr = *log_msgptr = NULL; |
| 2088 | sender_verified_failed = NULL; |
| 2089 | |
| 2090 | if (where == ACL_WHERE_RCPT) |
| 2091 | { |
| 2092 | adb = address_defaults; |
| 2093 | addr = &adb; |
| 2094 | addr->address = data_string; |
| 2095 | if (deliver_split_address(addr) == DEFER) |
| 2096 | { |
| 2097 | *log_msgptr = US"defer in percent_hack_domains check"; |
| 2098 | return DEFER; |
| 2099 | } |
| 2100 | deliver_domain = addr->domain; |
| 2101 | deliver_localpart = addr->local_part; |
| 2102 | } |
| 2103 | else |
| 2104 | { |
| 2105 | addr = NULL; |
| 2106 | smtp_command_argument = data_string; |
| 2107 | } |
| 2108 | |
| 2109 | rc = acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); |
| 2110 | |
| 2111 | smtp_command_argument = deliver_domain = |
| 2112 | deliver_localpart = deliver_address_data = NULL; |
| 2113 | |
| 2114 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA |
| 2115 | ACL, which is really in the middle of an SMTP command. */ |
| 2116 | |
| 2117 | if (rc == DISCARD) |
| 2118 | { |
| 2119 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) |
| 2120 | { |
| 2121 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " |
| 2122 | "ACL", acl_wherenames[where]); |
| 2123 | return ERROR; |
| 2124 | } |
| 2125 | return DISCARD; |
| 2126 | } |
| 2127 | |
| 2128 | /* A DROP response is not permitted from MAILAUTH */ |
| 2129 | |
| 2130 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) |
| 2131 | { |
| 2132 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " |
| 2133 | "ACL", acl_wherenames[where]); |
| 2134 | return ERROR; |
| 2135 | } |
| 2136 | |
| 2137 | /* Before giving an error response, take a look at the length of any user |
| 2138 | message, and split it up into multiple lines if possible. */ |
| 2139 | |
| 2140 | if (rc != OK && *user_msgptr != NULL && Ustrlen(*user_msgptr) > 75) |
| 2141 | { |
| 2142 | uschar *s = *user_msgptr = string_copy(*user_msgptr); |
| 2143 | uschar *ss = s; |
| 2144 | |
| 2145 | for (;;) |
| 2146 | { |
| 2147 | int i = 0; |
| 2148 | while (i < 75 && *ss != 0 && *ss != '\n') ss++, i++; |
| 2149 | if (*ss == 0) break; |
| 2150 | if (*ss == '\n') |
| 2151 | s = ++ss; |
| 2152 | else |
| 2153 | { |
| 2154 | uschar *t = ss + 1; |
| 2155 | uschar *tt = NULL; |
| 2156 | while (--t > s + 35) |
| 2157 | { |
| 2158 | if (*t == ' ') |
| 2159 | { |
| 2160 | if (t[-1] == ':') { tt = t; break; } |
| 2161 | if (tt == NULL) tt = t; |
| 2162 | } |
| 2163 | } |
| 2164 | |
| 2165 | if (tt == NULL) /* Can't split behind - try ahead */ |
| 2166 | { |
| 2167 | t = ss + 1; |
| 2168 | while (*t != 0) |
| 2169 | { |
| 2170 | if (*t == ' ' || *t == '\n') |
| 2171 | { tt = t; break; } |
| 2172 | t++; |
| 2173 | } |
| 2174 | } |
| 2175 | |
| 2176 | if (tt == NULL) break; /* Can't find anywhere to split */ |
| 2177 | *tt = '\n'; |
| 2178 | s = ss = tt+1; |
| 2179 | } |
| 2180 | } |
| 2181 | } |
| 2182 | |
| 2183 | return rc; |
| 2184 | } |
| 2185 | |
| 2186 | /* End of acl.c */ |