14d7ce451471a8d734311c565360c16ac437e3bb
[exim.git] / src / src / expand.c
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 US"substr",
133 US"tr" };
134
135 enum {
136 EITEM_ACL,
137 EITEM_AUTHRESULTS,
138 EITEM_CERTEXTRACT,
139 EITEM_DLFUNC,
140 EITEM_ENV,
141 EITEM_EXTRACT,
142 EITEM_FILTER,
143 EITEM_HASH,
144 EITEM_HMAC,
145 EITEM_IF,
146 #ifdef SUPPORT_I18N
147 EITEM_IMAPFOLDER,
148 #endif
149 EITEM_LENGTH,
150 EITEM_LISTEXTRACT,
151 EITEM_LOOKUP,
152 EITEM_MAP,
153 EITEM_NHASH,
154 EITEM_PERL,
155 EITEM_PRVS,
156 EITEM_PRVSCHECK,
157 EITEM_READFILE,
158 EITEM_READSOCK,
159 EITEM_REDUCE,
160 EITEM_RUN,
161 EITEM_SG,
162 EITEM_SORT,
163 EITEM_SUBSTR,
164 EITEM_TR };
165
166 /* Tables of operator names, and corresponding switch numbers. The names must be
167 in alphabetical order. There are two tables, because underscore is used in some
168 cases to introduce arguments, whereas for other it is part of the name. This is
169 an historical mis-design. */
170
171 static uschar *op_table_underscore[] = {
172 US"from_utf8",
173 US"local_part",
174 US"quote_local_part",
175 US"reverse_ip",
176 US"time_eval",
177 US"time_interval"
178 #ifdef SUPPORT_I18N
179 ,US"utf8_domain_from_alabel",
180 US"utf8_domain_to_alabel",
181 US"utf8_localpart_from_alabel",
182 US"utf8_localpart_to_alabel"
183 #endif
184 };
185
186 enum {
187 EOP_FROM_UTF8,
188 EOP_LOCAL_PART,
189 EOP_QUOTE_LOCAL_PART,
190 EOP_REVERSE_IP,
191 EOP_TIME_EVAL,
192 EOP_TIME_INTERVAL
193 #ifdef SUPPORT_I18N
194 ,EOP_UTF8_DOMAIN_FROM_ALABEL,
195 EOP_UTF8_DOMAIN_TO_ALABEL,
196 EOP_UTF8_LOCALPART_FROM_ALABEL,
197 EOP_UTF8_LOCALPART_TO_ALABEL
198 #endif
199 };
200
201 static uschar *op_table_main[] = {
202 US"address",
203 US"addresses",
204 US"base32",
205 US"base32d",
206 US"base62",
207 US"base62d",
208 US"base64",
209 US"base64d",
210 US"domain",
211 US"escape",
212 US"escape8bit",
213 US"eval",
214 US"eval10",
215 US"expand",
216 US"h",
217 US"hash",
218 US"hex2b64",
219 US"hexquote",
220 US"ipv6denorm",
221 US"ipv6norm",
222 US"l",
223 US"lc",
224 US"length",
225 US"listcount",
226 US"listnamed",
227 US"mask",
228 US"md5",
229 US"nh",
230 US"nhash",
231 US"quote",
232 US"randint",
233 US"rfc2047",
234 US"rfc2047d",
235 US"rxquote",
236 US"s",
237 US"sha1",
238 US"sha256",
239 US"sha3",
240 US"stat",
241 US"str2b64",
242 US"strlen",
243 US"substr",
244 US"uc",
245 US"utf8clean" };
246
247 enum {
248 EOP_ADDRESS = nelem(op_table_underscore),
249 EOP_ADDRESSES,
250 EOP_BASE32,
251 EOP_BASE32D,
252 EOP_BASE62,
253 EOP_BASE62D,
254 EOP_BASE64,
255 EOP_BASE64D,
256 EOP_DOMAIN,
257 EOP_ESCAPE,
258 EOP_ESCAPE8BIT,
259 EOP_EVAL,
260 EOP_EVAL10,
261 EOP_EXPAND,
262 EOP_H,
263 EOP_HASH,
264 EOP_HEX2B64,
265 EOP_HEXQUOTE,
266 EOP_IPV6DENORM,
267 EOP_IPV6NORM,
268 EOP_L,
269 EOP_LC,
270 EOP_LENGTH,
271 EOP_LISTCOUNT,
272 EOP_LISTNAMED,
273 EOP_MASK,
274 EOP_MD5,
275 EOP_NH,
276 EOP_NHASH,
277 EOP_QUOTE,
278 EOP_RANDINT,
279 EOP_RFC2047,
280 EOP_RFC2047D,
281 EOP_RXQUOTE,
282 EOP_S,
283 EOP_SHA1,
284 EOP_SHA256,
285 EOP_SHA3,
286 EOP_STAT,
287 EOP_STR2B64,
288 EOP_STRLEN,
289 EOP_SUBSTR,
290 EOP_UC,
291 EOP_UTF8CLEAN };
292
293
294 /* Table of condition names, and corresponding switch numbers. The names must
295 be in alphabetical order. */
296
297 static uschar *cond_table[] = {
298 US"<",
299 US"<=",
300 US"=",
301 US"==", /* Backward compatibility */
302 US">",
303 US">=",
304 US"acl",
305 US"and",
306 US"bool",
307 US"bool_lax",
308 US"crypteq",
309 US"def",
310 US"eq",
311 US"eqi",
312 US"exists",
313 US"first_delivery",
314 US"forall",
315 US"forall_json",
316 US"forall_jsons",
317 US"forany",
318 US"forany_json",
319 US"forany_jsons",
320 US"ge",
321 US"gei",
322 US"gt",
323 US"gti",
324 US"inlist",
325 US"inlisti",
326 US"isip",
327 US"isip4",
328 US"isip6",
329 US"ldapauth",
330 US"le",
331 US"lei",
332 US"lt",
333 US"lti",
334 US"match",
335 US"match_address",
336 US"match_domain",
337 US"match_ip",
338 US"match_local_part",
339 US"or",
340 US"pam",
341 US"pwcheck",
342 US"queue_running",
343 US"radius",
344 US"saslauthd"
345 };
346
347 enum {
348 ECOND_NUM_L,
349 ECOND_NUM_LE,
350 ECOND_NUM_E,
351 ECOND_NUM_EE,
352 ECOND_NUM_G,
353 ECOND_NUM_GE,
354 ECOND_ACL,
355 ECOND_AND,
356 ECOND_BOOL,
357 ECOND_BOOL_LAX,
358 ECOND_CRYPTEQ,
359 ECOND_DEF,
360 ECOND_STR_EQ,
361 ECOND_STR_EQI,
362 ECOND_EXISTS,
363 ECOND_FIRST_DELIVERY,
364 ECOND_FORALL,
365 ECOND_FORALL_JSON,
366 ECOND_FORALL_JSONS,
367 ECOND_FORANY,
368 ECOND_FORANY_JSON,
369 ECOND_FORANY_JSONS,
370 ECOND_STR_GE,
371 ECOND_STR_GEI,
372 ECOND_STR_GT,
373 ECOND_STR_GTI,
374 ECOND_INLIST,
375 ECOND_INLISTI,
376 ECOND_ISIP,
377 ECOND_ISIP4,
378 ECOND_ISIP6,
379 ECOND_LDAPAUTH,
380 ECOND_STR_LE,
381 ECOND_STR_LEI,
382 ECOND_STR_LT,
383 ECOND_STR_LTI,
384 ECOND_MATCH,
385 ECOND_MATCH_ADDRESS,
386 ECOND_MATCH_DOMAIN,
387 ECOND_MATCH_IP,
388 ECOND_MATCH_LOCAL_PART,
389 ECOND_OR,
390 ECOND_PAM,
391 ECOND_PWCHECK,
392 ECOND_QUEUE_RUNNING,
393 ECOND_RADIUS,
394 ECOND_SASLAUTHD
395 };
396
397
398 /* Types of table entry */
399
400 enum vtypes {
401 vtype_int, /* value is address of int */
402 vtype_filter_int, /* ditto, but recognized only when filtering */
403 vtype_ino, /* value is address of ino_t (not always an int) */
404 vtype_uid, /* value is address of uid_t (not always an int) */
405 vtype_gid, /* value is address of gid_t (not always an int) */
406 vtype_bool, /* value is address of bool */
407 vtype_stringptr, /* value is address of pointer to string */
408 vtype_msgbody, /* as stringptr, but read when first required */
409 vtype_msgbody_end, /* ditto, the end of the message */
410 vtype_msgheaders, /* the message's headers, processed */
411 vtype_msgheaders_raw, /* the message's headers, unprocessed */
412 vtype_localpart, /* extract local part from string */
413 vtype_domain, /* extract domain from string */
414 vtype_string_func, /* value is string returned by given function */
415 vtype_todbsdin, /* value not used; generate BSD inbox tod */
416 vtype_tode, /* value not used; generate tod in epoch format */
417 vtype_todel, /* value not used; generate tod in epoch/usec format */
418 vtype_todf, /* value not used; generate full tod */
419 vtype_todl, /* value not used; generate log tod */
420 vtype_todlf, /* value not used; generate log file datestamp tod */
421 vtype_todzone, /* value not used; generate time zone only */
422 vtype_todzulu, /* value not used; generate zulu tod */
423 vtype_reply, /* value not used; get reply from headers */
424 vtype_pid, /* value not used; result is pid */
425 vtype_host_lookup, /* value not used; get host name */
426 vtype_load_avg, /* value not used; result is int from os_getloadavg */
427 vtype_pspace, /* partition space; value is T/F for spool/log */
428 vtype_pinodes, /* partition inodes; value is T/F for spool/log */
429 vtype_cert /* SSL certificate */
430 #ifndef DISABLE_DKIM
431 ,vtype_dkim /* Lookup of value in DKIM signature */
432 #endif
433 };
434
435 /* Type for main variable table */
436
437 typedef struct {
438 const char *name;
439 enum vtypes type;
440 void *value;
441 } var_entry;
442
443 /* Type for entries pointing to address/length pairs. Not currently
444 in use. */
445
446 typedef struct {
447 uschar **address;
448 int *length;
449 } alblock;
450
451 static uschar * fn_recipients(void);
452
453 /* This table must be kept in alphabetical order. */
454
455 static var_entry var_table[] = {
456 /* WARNING: Do not invent variables whose names start acl_c or acl_m because
457 they will be confused with user-creatable ACL variables. */
458 { "acl_arg1", vtype_stringptr, &acl_arg[0] },
459 { "acl_arg2", vtype_stringptr, &acl_arg[1] },
460 { "acl_arg3", vtype_stringptr, &acl_arg[2] },
461 { "acl_arg4", vtype_stringptr, &acl_arg[3] },
462 { "acl_arg5", vtype_stringptr, &acl_arg[4] },
463 { "acl_arg6", vtype_stringptr, &acl_arg[5] },
464 { "acl_arg7", vtype_stringptr, &acl_arg[6] },
465 { "acl_arg8", vtype_stringptr, &acl_arg[7] },
466 { "acl_arg9", vtype_stringptr, &acl_arg[8] },
467 { "acl_narg", vtype_int, &acl_narg },
468 { "acl_verify_message", vtype_stringptr, &acl_verify_message },
469 { "address_data", vtype_stringptr, &deliver_address_data },
470 { "address_file", vtype_stringptr, &address_file },
471 { "address_pipe", vtype_stringptr, &address_pipe },
472 #ifdef EXPERIMENTAL_ARC
473 { "arc_domains", vtype_string_func, &fn_arc_domains },
474 { "arc_oldest_pass", vtype_int, &arc_oldest_pass },
475 { "arc_state", vtype_stringptr, &arc_state },
476 { "arc_state_reason", vtype_stringptr, &arc_state_reason },
477 #endif
478 { "authenticated_fail_id",vtype_stringptr, &authenticated_fail_id },
479 { "authenticated_id", vtype_stringptr, &authenticated_id },
480 { "authenticated_sender",vtype_stringptr, &authenticated_sender },
481 { "authentication_failed",vtype_int, &authentication_failed },
482 #ifdef WITH_CONTENT_SCAN
483 { "av_failed", vtype_int, &av_failed },
484 #endif
485 #ifdef EXPERIMENTAL_BRIGHTMAIL
486 { "bmi_alt_location", vtype_stringptr, &bmi_alt_location },
487 { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict },
488 { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict },
489 { "bmi_deliver", vtype_int, &bmi_deliver },
490 #endif
491 { "body_linecount", vtype_int, &body_linecount },
492 { "body_zerocount", vtype_int, &body_zerocount },
493 { "bounce_recipient", vtype_stringptr, &bounce_recipient },
494 { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit },
495 { "caller_gid", vtype_gid, &real_gid },
496 { "caller_uid", vtype_uid, &real_uid },
497 { "callout_address", vtype_stringptr, &callout_address },
498 { "compile_date", vtype_stringptr, &version_date },
499 { "compile_number", vtype_stringptr, &version_cnumber },
500 { "config_dir", vtype_stringptr, &config_main_directory },
501 { "config_file", vtype_stringptr, &config_main_filename },
502 { "csa_status", vtype_stringptr, &csa_status },
503 #ifdef EXPERIMENTAL_DCC
504 { "dcc_header", vtype_stringptr, &dcc_header },
505 { "dcc_result", vtype_stringptr, &dcc_result },
506 #endif
507 #ifndef DISABLE_DKIM
508 { "dkim_algo", vtype_dkim, (void *)DKIM_ALGO },
509 { "dkim_bodylength", vtype_dkim, (void *)DKIM_BODYLENGTH },
510 { "dkim_canon_body", vtype_dkim, (void *)DKIM_CANON_BODY },
511 { "dkim_canon_headers", vtype_dkim, (void *)DKIM_CANON_HEADERS },
512 { "dkim_copiedheaders", vtype_dkim, (void *)DKIM_COPIEDHEADERS },
513 { "dkim_created", vtype_dkim, (void *)DKIM_CREATED },
514 { "dkim_cur_signer", vtype_stringptr, &dkim_cur_signer },
515 { "dkim_domain", vtype_stringptr, &dkim_signing_domain },
516 { "dkim_expires", vtype_dkim, (void *)DKIM_EXPIRES },
517 { "dkim_headernames", vtype_dkim, (void *)DKIM_HEADERNAMES },
518 { "dkim_identity", vtype_dkim, (void *)DKIM_IDENTITY },
519 { "dkim_key_granularity",vtype_dkim, (void *)DKIM_KEY_GRANULARITY },
520 { "dkim_key_length", vtype_int, &dkim_key_length },
521 { "dkim_key_nosubdomains",vtype_dkim, (void *)DKIM_NOSUBDOMAINS },
522 { "dkim_key_notes", vtype_dkim, (void *)DKIM_KEY_NOTES },
523 { "dkim_key_srvtype", vtype_dkim, (void *)DKIM_KEY_SRVTYPE },
524 { "dkim_key_testing", vtype_dkim, (void *)DKIM_KEY_TESTING },
525 { "dkim_selector", vtype_stringptr, &dkim_signing_selector },
526 { "dkim_signers", vtype_stringptr, &dkim_signers },
527 { "dkim_verify_reason", vtype_stringptr, &dkim_verify_reason },
528 { "dkim_verify_status", vtype_stringptr, &dkim_verify_status },
529 #endif
530 #ifdef EXPERIMENTAL_DMARC
531 { "dmarc_domain_policy", vtype_stringptr, &dmarc_domain_policy },
532 { "dmarc_status", vtype_stringptr, &dmarc_status },
533 { "dmarc_status_text", vtype_stringptr, &dmarc_status_text },
534 { "dmarc_used_domain", vtype_stringptr, &dmarc_used_domain },
535 #endif
536 { "dnslist_domain", vtype_stringptr, &dnslist_domain },
537 { "dnslist_matched", vtype_stringptr, &dnslist_matched },
538 { "dnslist_text", vtype_stringptr, &dnslist_text },
539 { "dnslist_value", vtype_stringptr, &dnslist_value },
540 { "domain", vtype_stringptr, &deliver_domain },
541 { "domain_data", vtype_stringptr, &deliver_domain_data },
542 #ifndef DISABLE_EVENT
543 { "event_data", vtype_stringptr, &event_data },
544
545 /*XXX want to use generic vars for as many of these as possible*/
546 { "event_defer_errno", vtype_int, &event_defer_errno },
547
548 { "event_name", vtype_stringptr, &event_name },
549 #endif
550 { "exim_gid", vtype_gid, &exim_gid },
551 { "exim_path", vtype_stringptr, &exim_path },
552 { "exim_uid", vtype_uid, &exim_uid },
553 { "exim_version", vtype_stringptr, &version_string },
554 { "headers_added", vtype_string_func, &fn_hdrs_added },
555 { "home", vtype_stringptr, &deliver_home },
556 { "host", vtype_stringptr, &deliver_host },
557 { "host_address", vtype_stringptr, &deliver_host_address },
558 { "host_data", vtype_stringptr, &host_data },
559 { "host_lookup_deferred",vtype_int, &host_lookup_deferred },
560 { "host_lookup_failed", vtype_int, &host_lookup_failed },
561 { "host_port", vtype_int, &deliver_host_port },
562 { "initial_cwd", vtype_stringptr, &initial_cwd },
563 { "inode", vtype_ino, &deliver_inode },
564 { "interface_address", vtype_stringptr, &interface_address },
565 { "interface_port", vtype_int, &interface_port },
566 { "item", vtype_stringptr, &iterate_item },
567 #ifdef LOOKUP_LDAP
568 { "ldap_dn", vtype_stringptr, &eldap_dn },
569 #endif
570 { "load_average", vtype_load_avg, NULL },
571 { "local_part", vtype_stringptr, &deliver_localpart },
572 { "local_part_data", vtype_stringptr, &deliver_localpart_data },
573 { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix },
574 { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix },
575 #ifdef HAVE_LOCAL_SCAN
576 { "local_scan_data", vtype_stringptr, &local_scan_data },
577 #endif
578 { "local_user_gid", vtype_gid, &local_user_gid },
579 { "local_user_uid", vtype_uid, &local_user_uid },
580 { "localhost_number", vtype_int, &host_number },
581 { "log_inodes", vtype_pinodes, (void *)FALSE },
582 { "log_space", vtype_pspace, (void *)FALSE },
583 { "lookup_dnssec_authenticated",vtype_stringptr,&lookup_dnssec_authenticated},
584 { "mailstore_basename", vtype_stringptr, &mailstore_basename },
585 #ifdef WITH_CONTENT_SCAN
586 { "malware_name", vtype_stringptr, &malware_name },
587 #endif
588 { "max_received_linelength", vtype_int, &max_received_linelength },
589 { "message_age", vtype_int, &message_age },
590 { "message_body", vtype_msgbody, &message_body },
591 { "message_body_end", vtype_msgbody_end, &message_body_end },
592 { "message_body_size", vtype_int, &message_body_size },
593 { "message_exim_id", vtype_stringptr, &message_id },
594 { "message_headers", vtype_msgheaders, NULL },
595 { "message_headers_raw", vtype_msgheaders_raw, NULL },
596 { "message_id", vtype_stringptr, &message_id },
597 { "message_linecount", vtype_int, &message_linecount },
598 { "message_size", vtype_int, &message_size },
599 #ifdef SUPPORT_I18N
600 { "message_smtputf8", vtype_bool, &message_smtputf8 },
601 #endif
602 #ifdef WITH_CONTENT_SCAN
603 { "mime_anomaly_level", vtype_int, &mime_anomaly_level },
604 { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text },
605 { "mime_boundary", vtype_stringptr, &mime_boundary },
606 { "mime_charset", vtype_stringptr, &mime_charset },
607 { "mime_content_description", vtype_stringptr, &mime_content_description },
608 { "mime_content_disposition", vtype_stringptr, &mime_content_disposition },
609 { "mime_content_id", vtype_stringptr, &mime_content_id },
610 { "mime_content_size", vtype_int, &mime_content_size },
611 { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding },
612 { "mime_content_type", vtype_stringptr, &mime_content_type },
613 { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename },
614 { "mime_filename", vtype_stringptr, &mime_filename },
615 { "mime_is_coverletter", vtype_int, &mime_is_coverletter },
616 { "mime_is_multipart", vtype_int, &mime_is_multipart },
617 { "mime_is_rfc822", vtype_int, &mime_is_rfc822 },
618 { "mime_part_count", vtype_int, &mime_part_count },
619 #endif
620 { "n0", vtype_filter_int, &filter_n[0] },
621 { "n1", vtype_filter_int, &filter_n[1] },
622 { "n2", vtype_filter_int, &filter_n[2] },
623 { "n3", vtype_filter_int, &filter_n[3] },
624 { "n4", vtype_filter_int, &filter_n[4] },
625 { "n5", vtype_filter_int, &filter_n[5] },
626 { "n6", vtype_filter_int, &filter_n[6] },
627 { "n7", vtype_filter_int, &filter_n[7] },
628 { "n8", vtype_filter_int, &filter_n[8] },
629 { "n9", vtype_filter_int, &filter_n[9] },
630 { "original_domain", vtype_stringptr, &deliver_domain_orig },
631 { "original_local_part", vtype_stringptr, &deliver_localpart_orig },
632 { "originator_gid", vtype_gid, &originator_gid },
633 { "originator_uid", vtype_uid, &originator_uid },
634 { "parent_domain", vtype_stringptr, &deliver_domain_parent },
635 { "parent_local_part", vtype_stringptr, &deliver_localpart_parent },
636 { "pid", vtype_pid, NULL },
637 #ifndef DISABLE_PRDR
638 { "prdr_requested", vtype_bool, &prdr_requested },
639 #endif
640 { "primary_hostname", vtype_stringptr, &primary_hostname },
641 #if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS)
642 { "proxy_external_address",vtype_stringptr, &proxy_external_address },
643 { "proxy_external_port", vtype_int, &proxy_external_port },
644 { "proxy_local_address", vtype_stringptr, &proxy_local_address },
645 { "proxy_local_port", vtype_int, &proxy_local_port },
646 { "proxy_session", vtype_bool, &proxy_session },
647 #endif
648 { "prvscheck_address", vtype_stringptr, &prvscheck_address },
649 { "prvscheck_keynum", vtype_stringptr, &prvscheck_keynum },
650 { "prvscheck_result", vtype_stringptr, &prvscheck_result },
651 { "qualify_domain", vtype_stringptr, &qualify_domain_sender },
652 { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient },
653 { "queue_name", vtype_stringptr, &queue_name },
654 { "rcpt_count", vtype_int, &rcpt_count },
655 { "rcpt_defer_count", vtype_int, &rcpt_defer_count },
656 { "rcpt_fail_count", vtype_int, &rcpt_fail_count },
657 { "received_count", vtype_int, &received_count },
658 { "received_for", vtype_stringptr, &received_for },
659 { "received_ip_address", vtype_stringptr, &interface_address },
660 { "received_port", vtype_int, &interface_port },
661 { "received_protocol", vtype_stringptr, &received_protocol },
662 { "received_time", vtype_int, &received_time.tv_sec },
663 { "recipient_data", vtype_stringptr, &recipient_data },
664 { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure },
665 { "recipients", vtype_string_func, &fn_recipients },
666 { "recipients_count", vtype_int, &recipients_count },
667 #ifdef WITH_CONTENT_SCAN
668 { "regex_match_string", vtype_stringptr, &regex_match_string },
669 #endif
670 { "reply_address", vtype_reply, NULL },
671 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
672 { "requiretls", vtype_bool, &tls_requiretls },
673 #endif
674 { "return_path", vtype_stringptr, &return_path },
675 { "return_size_limit", vtype_int, &bounce_return_size_limit },
676 { "router_name", vtype_stringptr, &router_name },
677 { "runrc", vtype_int, &runrc },
678 { "self_hostname", vtype_stringptr, &self_hostname },
679 { "sender_address", vtype_stringptr, &sender_address },
680 { "sender_address_data", vtype_stringptr, &sender_address_data },
681 { "sender_address_domain", vtype_domain, &sender_address },
682 { "sender_address_local_part", vtype_localpart, &sender_address },
683 { "sender_data", vtype_stringptr, &sender_data },
684 { "sender_fullhost", vtype_stringptr, &sender_fullhost },
685 { "sender_helo_dnssec", vtype_bool, &sender_helo_dnssec },
686 { "sender_helo_name", vtype_stringptr, &sender_helo_name },
687 { "sender_host_address", vtype_stringptr, &sender_host_address },
688 { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated },
689 { "sender_host_dnssec", vtype_bool, &sender_host_dnssec },
690 { "sender_host_name", vtype_host_lookup, NULL },
691 { "sender_host_port", vtype_int, &sender_host_port },
692 { "sender_ident", vtype_stringptr, &sender_ident },
693 { "sender_rate", vtype_stringptr, &sender_rate },
694 { "sender_rate_limit", vtype_stringptr, &sender_rate_limit },
695 { "sender_rate_period", vtype_stringptr, &sender_rate_period },
696 { "sender_rcvhost", vtype_stringptr, &sender_rcvhost },
697 { "sender_verify_failure",vtype_stringptr, &sender_verify_failure },
698 { "sending_ip_address", vtype_stringptr, &sending_ip_address },
699 { "sending_port", vtype_int, &sending_port },
700 { "smtp_active_hostname", vtype_stringptr, &smtp_active_hostname },
701 { "smtp_command", vtype_stringptr, &smtp_cmd_buffer },
702 { "smtp_command_argument", vtype_stringptr, &smtp_cmd_argument },
703 { "smtp_command_history", vtype_string_func, &smtp_cmd_hist },
704 { "smtp_count_at_connection_start", vtype_int, &smtp_accept_count },
705 { "smtp_notquit_reason", vtype_stringptr, &smtp_notquit_reason },
706 { "sn0", vtype_filter_int, &filter_sn[0] },
707 { "sn1", vtype_filter_int, &filter_sn[1] },
708 { "sn2", vtype_filter_int, &filter_sn[2] },
709 { "sn3", vtype_filter_int, &filter_sn[3] },
710 { "sn4", vtype_filter_int, &filter_sn[4] },
711 { "sn5", vtype_filter_int, &filter_sn[5] },
712 { "sn6", vtype_filter_int, &filter_sn[6] },
713 { "sn7", vtype_filter_int, &filter_sn[7] },
714 { "sn8", vtype_filter_int, &filter_sn[8] },
715 { "sn9", vtype_filter_int, &filter_sn[9] },
716 #ifdef WITH_CONTENT_SCAN
717 { "spam_action", vtype_stringptr, &spam_action },
718 { "spam_bar", vtype_stringptr, &spam_bar },
719 { "spam_report", vtype_stringptr, &spam_report },
720 { "spam_score", vtype_stringptr, &spam_score },
721 { "spam_score_int", vtype_stringptr, &spam_score_int },
722 #endif
723 #ifdef SUPPORT_SPF
724 { "spf_guess", vtype_stringptr, &spf_guess },
725 { "spf_header_comment", vtype_stringptr, &spf_header_comment },
726 { "spf_received", vtype_stringptr, &spf_received },
727 { "spf_result", vtype_stringptr, &spf_result },
728 { "spf_result_guessed", vtype_bool, &spf_result_guessed },
729 { "spf_smtp_comment", vtype_stringptr, &spf_smtp_comment },
730 #endif
731 { "spool_directory", vtype_stringptr, &spool_directory },
732 { "spool_inodes", vtype_pinodes, (void *)TRUE },
733 { "spool_space", vtype_pspace, (void *)TRUE },
734 #ifdef EXPERIMENTAL_SRS
735 { "srs_db_address", vtype_stringptr, &srs_db_address },
736 { "srs_db_key", vtype_stringptr, &srs_db_key },
737 { "srs_orig_recipient", vtype_stringptr, &srs_orig_recipient },
738 { "srs_orig_sender", vtype_stringptr, &srs_orig_sender },
739 { "srs_recipient", vtype_stringptr, &srs_recipient },
740 { "srs_status", vtype_stringptr, &srs_status },
741 #endif
742 { "thisaddress", vtype_stringptr, &filter_thisaddress },
743
744 /* The non-(in,out) variables are now deprecated */
745 { "tls_bits", vtype_int, &tls_in.bits },
746 { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified },
747 { "tls_cipher", vtype_stringptr, &tls_in.cipher },
748
749 { "tls_in_bits", vtype_int, &tls_in.bits },
750 { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified },
751 { "tls_in_cipher", vtype_stringptr, &tls_in.cipher },
752 { "tls_in_cipher_std", vtype_stringptr, &tls_in.cipher_stdname },
753 { "tls_in_ocsp", vtype_int, &tls_in.ocsp },
754 { "tls_in_ourcert", vtype_cert, &tls_in.ourcert },
755 { "tls_in_peercert", vtype_cert, &tls_in.peercert },
756 { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn },
757 #if defined(SUPPORT_TLS)
758 { "tls_in_sni", vtype_stringptr, &tls_in.sni },
759 #endif
760 { "tls_out_bits", vtype_int, &tls_out.bits },
761 { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified },
762 { "tls_out_cipher", vtype_stringptr, &tls_out.cipher },
763 { "tls_out_cipher_std", vtype_stringptr, &tls_out.cipher_stdname },
764 #ifdef SUPPORT_DANE
765 { "tls_out_dane", vtype_bool, &tls_out.dane_verified },
766 #endif
767 { "tls_out_ocsp", vtype_int, &tls_out.ocsp },
768 { "tls_out_ourcert", vtype_cert, &tls_out.ourcert },
769 { "tls_out_peercert", vtype_cert, &tls_out.peercert },
770 { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn },
771 #if defined(SUPPORT_TLS)
772 { "tls_out_sni", vtype_stringptr, &tls_out.sni },
773 #endif
774 #ifdef SUPPORT_DANE
775 { "tls_out_tlsa_usage", vtype_int, &tls_out.tlsa_usage },
776 #endif
777
778 { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */
779 #if defined(SUPPORT_TLS)
780 { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */
781 #endif
782
783 { "tod_bsdinbox", vtype_todbsdin, NULL },
784 { "tod_epoch", vtype_tode, NULL },
785 { "tod_epoch_l", vtype_todel, NULL },
786 { "tod_full", vtype_todf, NULL },
787 { "tod_log", vtype_todl, NULL },
788 { "tod_logfile", vtype_todlf, NULL },
789 { "tod_zone", vtype_todzone, NULL },
790 { "tod_zulu", vtype_todzulu, NULL },
791 { "transport_name", vtype_stringptr, &transport_name },
792 { "value", vtype_stringptr, &lookup_value },
793 { "verify_mode", vtype_stringptr, &verify_mode },
794 { "version_number", vtype_stringptr, &version_string },
795 { "warn_message_delay", vtype_stringptr, &warnmsg_delay },
796 { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients },
797 { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients },
798 { "warnmsg_delay", vtype_stringptr, &warnmsg_delay },
799 { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients },
800 { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients }
801 };
802
803 static int var_table_size = nelem(var_table);
804 static uschar var_buffer[256];
805 static BOOL malformed_header;
806
807 /* For textual hashes */
808
809 static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz"
810 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
811 "0123456789";
812
813 enum { HMAC_MD5, HMAC_SHA1 };
814
815 /* For numeric hashes */
816
817 static unsigned int prime[] = {
818 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
819 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
820 73, 79, 83, 89, 97, 101, 103, 107, 109, 113};
821
822 /* For printing modes in symbolic form */
823
824 static uschar *mtable_normal[] =
825 { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" };
826
827 static uschar *mtable_setid[] =
828 { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" };
829
830 static uschar *mtable_sticky[] =
831 { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" };
832
833 /* flags for find_header() */
834 #define FH_EXISTS_ONLY BIT(0)
835 #define FH_WANT_RAW BIT(1)
836 #define FH_WANT_LIST BIT(2)
837
838
839 /*************************************************
840 * Tables for UTF-8 support *
841 *************************************************/
842
843 /* Table of the number of extra characters, indexed by the first character
844 masked with 0x3f. The highest number for a valid UTF-8 character is in fact
845 0x3d. */
846
847 static uschar utf8_table1[] = {
848 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
849 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
850 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
851 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
852
853 /* These are the masks for the data bits in the first byte of a character,
854 indexed by the number of additional bytes. */
855
856 static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
857
858 /* Get the next UTF-8 character, advancing the pointer. */
859
860 #define GETUTF8INC(c, ptr) \
861 c = *ptr++; \
862 if ((c & 0xc0) == 0xc0) \
863 { \
864 int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \
865 int s = 6*a; \
866 c = (c & utf8_table2[a]) << s; \
867 while (a-- > 0) \
868 { \
869 s -= 6; \
870 c |= (*ptr++ & 0x3f) << s; \
871 } \
872 }
873
874
875
876 static uschar * base32_chars = US"abcdefghijklmnopqrstuvwxyz234567";
877
878 /*************************************************
879 * Binary chop search on a table *
880 *************************************************/
881
882 /* This is used for matching expansion items and operators.
883
884 Arguments:
885 name the name that is being sought
886 table the table to search
887 table_size the number of items in the table
888
889 Returns: the offset in the table, or -1
890 */
891
892 static int
893 chop_match(uschar *name, uschar **table, int table_size)
894 {
895 uschar **bot = table;
896 uschar **top = table + table_size;
897
898 while (top > bot)
899 {
900 uschar **mid = bot + (top - bot)/2;
901 int c = Ustrcmp(name, *mid);
902 if (c == 0) return mid - table;
903 if (c > 0) bot = mid + 1; else top = mid;
904 }
905
906 return -1;
907 }
908
909
910
911 /*************************************************
912 * Check a condition string *
913 *************************************************/
914
915 /* This function is called to expand a string, and test the result for a "true"
916 or "false" value. Failure of the expansion yields FALSE; logged unless it was a
917 forced fail or lookup defer.
918
919 We used to release all store used, but this is not not safe due
920 to ${dlfunc } and ${acl }. In any case expand_string_internal()
921 is reasonably careful to release what it can.
922
923 The actual false-value tests should be replicated for ECOND_BOOL_LAX.
924
925 Arguments:
926 condition the condition string
927 m1 text to be incorporated in panic error
928 m2 ditto
929
930 Returns: TRUE if condition is met, FALSE if not
931 */
932
933 BOOL
934 expand_check_condition(uschar *condition, uschar *m1, uschar *m2)
935 {
936 int rc;
937 uschar *ss = expand_string(condition);
938 if (ss == NULL)
939 {
940 if (!f.expand_string_forcedfail && !f.search_find_defer)
941 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" "
942 "for %s %s: %s", condition, m1, m2, expand_string_message);
943 return FALSE;
944 }
945 rc = ss[0] != 0 && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 &&
946 strcmpic(ss, US"false") != 0;
947 return rc;
948 }
949
950
951
952
953 /*************************************************
954 * Pseudo-random number generation *
955 *************************************************/
956
957 /* Pseudo-random number generation. The result is not "expected" to be
958 cryptographically strong but not so weak that someone will shoot themselves
959 in the foot using it as a nonce in some email header scheme or whatever
960 weirdness they'll twist this into. The result should ideally handle fork().
961
962 However, if we're stuck unable to provide this, then we'll fall back to
963 appallingly bad randomness.
964
965 If SUPPORT_TLS is defined then this will not be used except as an emergency
966 fallback.
967
968 Arguments:
969 max range maximum
970 Returns a random number in range [0, max-1]
971 */
972
973 #ifdef SUPPORT_TLS
974 # define vaguely_random_number vaguely_random_number_fallback
975 #endif
976 int
977 vaguely_random_number(int max)
978 {
979 #ifdef SUPPORT_TLS
980 # undef vaguely_random_number
981 #endif
982 static pid_t pid = 0;
983 pid_t p2;
984 #if defined(HAVE_SRANDOM) && !defined(HAVE_SRANDOMDEV)
985 struct timeval tv;
986 #endif
987
988 p2 = getpid();
989 if (p2 != pid)
990 {
991 if (pid != 0)
992 {
993
994 #ifdef HAVE_ARC4RANDOM
995 /* cryptographically strong randomness, common on *BSD platforms, not
996 so much elsewhere. Alas. */
997 #ifndef NOT_HAVE_ARC4RANDOM_STIR
998 arc4random_stir();
999 #endif
1000 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1001 #ifdef HAVE_SRANDOMDEV
1002 /* uses random(4) for seeding */
1003 srandomdev();
1004 #else
1005 gettimeofday(&tv, NULL);
1006 srandom(tv.tv_sec | tv.tv_usec | getpid());
1007 #endif
1008 #else
1009 /* Poor randomness and no seeding here */
1010 #endif
1011
1012 }
1013 pid = p2;
1014 }
1015
1016 #ifdef HAVE_ARC4RANDOM
1017 return arc4random() % max;
1018 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1019 return random() % max;
1020 #else
1021 /* This one returns a 16-bit number, definitely not crypto-strong */
1022 return random_number(max);
1023 #endif
1024 }
1025
1026
1027
1028
1029 /*************************************************
1030 * Pick out a name from a string *
1031 *************************************************/
1032
1033 /* If the name is too long, it is silently truncated.
1034
1035 Arguments:
1036 name points to a buffer into which to put the name
1037 max is the length of the buffer
1038 s points to the first alphabetic character of the name
1039 extras chars other than alphanumerics to permit
1040
1041 Returns: pointer to the first character after the name
1042
1043 Note: The test for *s != 0 in the while loop is necessary because
1044 Ustrchr() yields non-NULL if the character is zero (which is not something
1045 I expected). */
1046
1047 static const uschar *
1048 read_name(uschar *name, int max, const uschar *s, uschar *extras)
1049 {
1050 int ptr = 0;
1051 while (*s != 0 && (isalnum(*s) || Ustrchr(extras, *s) != NULL))
1052 {
1053 if (ptr < max-1) name[ptr++] = *s;
1054 s++;
1055 }
1056 name[ptr] = 0;
1057 return s;
1058 }
1059
1060
1061
1062 /*************************************************
1063 * Pick out the rest of a header name *
1064 *************************************************/
1065
1066 /* A variable name starting $header_ (or just $h_ for those who like
1067 abbreviations) might not be the complete header name because headers can
1068 contain any printing characters in their names, except ':'. This function is
1069 called to read the rest of the name, chop h[eader]_ off the front, and put ':'
1070 on the end, if the name was terminated by white space.
1071
1072 Arguments:
1073 name points to a buffer in which the name read so far exists
1074 max is the length of the buffer
1075 s points to the first character after the name so far, i.e. the
1076 first non-alphameric character after $header_xxxxx
1077
1078 Returns: a pointer to the first character after the header name
1079 */
1080
1081 static const uschar *
1082 read_header_name(uschar *name, int max, const uschar *s)
1083 {
1084 int prelen = Ustrchr(name, '_') - name + 1;
1085 int ptr = Ustrlen(name) - prelen;
1086 if (ptr > 0) memmove(name, name+prelen, ptr);
1087 while (mac_isgraph(*s) && *s != ':')
1088 {
1089 if (ptr < max-1) name[ptr++] = *s;
1090 s++;
1091 }
1092 if (*s == ':') s++;
1093 name[ptr++] = ':';
1094 name[ptr] = 0;
1095 return s;
1096 }
1097
1098
1099
1100 /*************************************************
1101 * Pick out a number from a string *
1102 *************************************************/
1103
1104 /* Arguments:
1105 n points to an integer into which to put the number
1106 s points to the first digit of the number
1107
1108 Returns: a pointer to the character after the last digit
1109 */
1110 /*XXX consider expanding to int_eximarith_t. But the test for
1111 "overbig numbers" in 0002 still needs to overflow it. */
1112
1113 static uschar *
1114 read_number(int *n, uschar *s)
1115 {
1116 *n = 0;
1117 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1118 return s;
1119 }
1120
1121 static const uschar *
1122 read_cnumber(int *n, const uschar *s)
1123 {
1124 *n = 0;
1125 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1126 return s;
1127 }
1128
1129
1130
1131 /*************************************************
1132 * Extract keyed subfield from a string *
1133 *************************************************/
1134
1135 /* The yield is in dynamic store; NULL means that the key was not found.
1136
1137 Arguments:
1138 key points to the name of the key
1139 s points to the string from which to extract the subfield
1140
1141 Returns: NULL if the subfield was not found, or
1142 a pointer to the subfield's data
1143 */
1144
1145 static uschar *
1146 expand_getkeyed(uschar * key, const uschar * s)
1147 {
1148 int length = Ustrlen(key);
1149 while (isspace(*s)) s++;
1150
1151 /* Loop to search for the key */
1152
1153 while (*s)
1154 {
1155 int dkeylength;
1156 uschar * data;
1157 const uschar * dkey = s;
1158
1159 while (*s && *s != '=' && !isspace(*s)) s++;
1160 dkeylength = s - dkey;
1161 while (isspace(*s)) s++;
1162 if (*s == '=') while (isspace((*(++s))));
1163
1164 data = string_dequote(&s);
1165 if (length == dkeylength && strncmpic(key, dkey, length) == 0)
1166 return data;
1167
1168 while (isspace(*s)) s++;
1169 }
1170
1171 return NULL;
1172 }
1173
1174
1175
1176 static var_entry *
1177 find_var_ent(uschar * name)
1178 {
1179 int first = 0;
1180 int last = var_table_size;
1181
1182 while (last > first)
1183 {
1184 int middle = (first + last)/2;
1185 int c = Ustrcmp(name, var_table[middle].name);
1186
1187 if (c > 0) { first = middle + 1; continue; }
1188 if (c < 0) { last = middle; continue; }
1189 return &var_table[middle];
1190 }
1191 return NULL;
1192 }
1193
1194 /*************************************************
1195 * Extract numbered subfield from string *
1196 *************************************************/
1197
1198 /* Extracts a numbered field from a string that is divided by tokens - for
1199 example a line from /etc/passwd is divided by colon characters. First field is
1200 numbered one. Negative arguments count from the right. Zero returns the whole
1201 string. Returns NULL if there are insufficient tokens in the string
1202
1203 ***WARNING***
1204 Modifies final argument - this is a dynamically generated string, so that's OK.
1205
1206 Arguments:
1207 field number of field to be extracted,
1208 first field = 1, whole string = 0, last field = -1
1209 separators characters that are used to break string into tokens
1210 s points to the string from which to extract the subfield
1211
1212 Returns: NULL if the field was not found,
1213 a pointer to the field's data inside s (modified to add 0)
1214 */
1215
1216 static uschar *
1217 expand_gettokened (int field, uschar *separators, uschar *s)
1218 {
1219 int sep = 1;
1220 int count;
1221 uschar *ss = s;
1222 uschar *fieldtext = NULL;
1223
1224 if (field == 0) return s;
1225
1226 /* Break the line up into fields in place; for field > 0 we stop when we have
1227 done the number of fields we want. For field < 0 we continue till the end of
1228 the string, counting the number of fields. */
1229
1230 count = (field > 0)? field : INT_MAX;
1231
1232 while (count-- > 0)
1233 {
1234 size_t len;
1235
1236 /* Previous field was the last one in the string. For a positive field
1237 number, this means there are not enough fields. For a negative field number,
1238 check that there are enough, and scan back to find the one that is wanted. */
1239
1240 if (sep == 0)
1241 {
1242 if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL;
1243 if ((-field) == (INT_MAX - count - 1)) return s;
1244 while (field++ < 0)
1245 {
1246 ss--;
1247 while (ss[-1] != 0) ss--;
1248 }
1249 fieldtext = ss;
1250 break;
1251 }
1252
1253 /* Previous field was not last in the string; save its start and put a
1254 zero at its end. */
1255
1256 fieldtext = ss;
1257 len = Ustrcspn(ss, separators);
1258 sep = ss[len];
1259 ss[len] = 0;
1260 ss += len + 1;
1261 }
1262
1263 return fieldtext;
1264 }
1265
1266
1267 static uschar *
1268 expand_getlistele(int field, const uschar * list)
1269 {
1270 const uschar * tlist = list;
1271 int sep = 0;
1272 uschar dummy;
1273
1274 if (field < 0)
1275 {
1276 for (field++; string_nextinlist(&tlist, &sep, &dummy, 1); ) field++;
1277 sep = 0;
1278 }
1279 if (field == 0) return NULL;
1280 while (--field > 0 && (string_nextinlist(&list, &sep, &dummy, 1))) ;
1281 return string_nextinlist(&list, &sep, NULL, 0);
1282 }
1283
1284
1285 /* Certificate fields, by name. Worry about by-OID later */
1286 /* Names are chosen to not have common prefixes */
1287
1288 #ifdef SUPPORT_TLS
1289 typedef struct
1290 {
1291 uschar * name;
1292 int namelen;
1293 uschar * (*getfn)(void * cert, uschar * mod);
1294 } certfield;
1295 static certfield certfields[] =
1296 { /* linear search; no special order */
1297 { US"version", 7, &tls_cert_version },
1298 { US"serial_number", 13, &tls_cert_serial_number },
1299 { US"subject", 7, &tls_cert_subject },
1300 { US"notbefore", 9, &tls_cert_not_before },
1301 { US"notafter", 8, &tls_cert_not_after },
1302 { US"issuer", 6, &tls_cert_issuer },
1303 { US"signature", 9, &tls_cert_signature },
1304 { US"sig_algorithm", 13, &tls_cert_signature_algorithm },
1305 { US"subj_altname", 12, &tls_cert_subject_altname },
1306 { US"ocsp_uri", 8, &tls_cert_ocsp_uri },
1307 { US"crl_uri", 7, &tls_cert_crl_uri },
1308 };
1309
1310 static uschar *
1311 expand_getcertele(uschar * field, uschar * certvar)
1312 {
1313 var_entry * vp;
1314
1315 if (!(vp = find_var_ent(certvar)))
1316 {
1317 expand_string_message =
1318 string_sprintf("no variable named \"%s\"", certvar);
1319 return NULL; /* Unknown variable name */
1320 }
1321 /* NB this stops us passing certs around in variable. Might
1322 want to do that in future */
1323 if (vp->type != vtype_cert)
1324 {
1325 expand_string_message =
1326 string_sprintf("\"%s\" is not a certificate", certvar);
1327 return NULL; /* Unknown variable name */
1328 }
1329 if (!*(void **)vp->value)
1330 return NULL;
1331
1332 if (*field >= '0' && *field <= '9')
1333 return tls_cert_ext_by_oid(*(void **)vp->value, field, 0);
1334
1335 for (certfield * cp = certfields;
1336 cp < certfields + nelem(certfields);
1337 cp++)
1338 if (Ustrncmp(cp->name, field, cp->namelen) == 0)
1339 {
1340 uschar * modifier = *(field += cp->namelen) == ','
1341 ? ++field : NULL;
1342 return (*cp->getfn)( *(void **)vp->value, modifier );
1343 }
1344
1345 expand_string_message =
1346 string_sprintf("bad field selector \"%s\" for certextract", field);
1347 return NULL;
1348 }
1349 #endif /*SUPPORT_TLS*/
1350
1351 /*************************************************
1352 * Extract a substring from a string *
1353 *************************************************/
1354
1355 /* Perform the ${substr or ${length expansion operations.
1356
1357 Arguments:
1358 subject the input string
1359 value1 the offset from the start of the input string to the start of
1360 the output string; if negative, count from the right.
1361 value2 the length of the output string, or negative (-1) for unset
1362 if value1 is positive, unset means "all after"
1363 if value1 is negative, unset means "all before"
1364 len set to the length of the returned string
1365
1366 Returns: pointer to the output string, or NULL if there is an error
1367 */
1368
1369 static uschar *
1370 extract_substr(uschar *subject, int value1, int value2, int *len)
1371 {
1372 int sublen = Ustrlen(subject);
1373
1374 if (value1 < 0) /* count from right */
1375 {
1376 value1 += sublen;
1377
1378 /* If the position is before the start, skip to the start, and adjust the
1379 length. If the length ends up negative, the substring is null because nothing
1380 can precede. This falls out naturally when the length is unset, meaning "all
1381 to the left". */
1382
1383 if (value1 < 0)
1384 {
1385 value2 += value1;
1386 if (value2 < 0) value2 = 0;
1387 value1 = 0;
1388 }
1389
1390 /* Otherwise an unset length => characters before value1 */
1391
1392 else if (value2 < 0)
1393 {
1394 value2 = value1;
1395 value1 = 0;
1396 }
1397 }
1398
1399 /* For a non-negative offset, if the starting position is past the end of the
1400 string, the result will be the null string. Otherwise, an unset length means
1401 "rest"; just set it to the maximum - it will be cut down below if necessary. */
1402
1403 else
1404 {
1405 if (value1 > sublen)
1406 {
1407 value1 = sublen;
1408 value2 = 0;
1409 }
1410 else if (value2 < 0) value2 = sublen;
1411 }
1412
1413 /* Cut the length down to the maximum possible for the offset value, and get
1414 the required characters. */
1415
1416 if (value1 + value2 > sublen) value2 = sublen - value1;
1417 *len = value2;
1418 return subject + value1;
1419 }
1420
1421
1422
1423
1424 /*************************************************
1425 * Old-style hash of a string *
1426 *************************************************/
1427
1428 /* Perform the ${hash expansion operation.
1429
1430 Arguments:
1431 subject the input string (an expanded substring)
1432 value1 the length of the output string; if greater or equal to the
1433 length of the input string, the input string is returned
1434 value2 the number of hash characters to use, or 26 if negative
1435 len set to the length of the returned string
1436
1437 Returns: pointer to the output string, or NULL if there is an error
1438 */
1439
1440 static uschar *
1441 compute_hash(uschar *subject, int value1, int value2, int *len)
1442 {
1443 int sublen = Ustrlen(subject);
1444
1445 if (value2 < 0) value2 = 26;
1446 else if (value2 > Ustrlen(hashcodes))
1447 {
1448 expand_string_message =
1449 string_sprintf("hash count \"%d\" too big", value2);
1450 return NULL;
1451 }
1452
1453 /* Calculate the hash text. We know it is shorter than the original string, so
1454 can safely place it in subject[] (we know that subject is always itself an
1455 expanded substring). */
1456
1457 if (value1 < sublen)
1458 {
1459 int c;
1460 int i = 0;
1461 int j = value1;
1462 while ((c = (subject[j])) != 0)
1463 {
1464 int shift = (c + j++) & 7;
1465 subject[i] ^= (c << shift) | (c >> (8-shift));
1466 if (++i >= value1) i = 0;
1467 }
1468 for (i = 0; i < value1; i++)
1469 subject[i] = hashcodes[(subject[i]) % value2];
1470 }
1471 else value1 = sublen;
1472
1473 *len = value1;
1474 return subject;
1475 }
1476
1477
1478
1479
1480 /*************************************************
1481 * Numeric hash of a string *
1482 *************************************************/
1483
1484 /* Perform the ${nhash expansion operation. The first characters of the
1485 string are treated as most important, and get the highest prime numbers.
1486
1487 Arguments:
1488 subject the input string
1489 value1 the maximum value of the first part of the result
1490 value2 the maximum value of the second part of the result,
1491 or negative to produce only a one-part result
1492 len set to the length of the returned string
1493
1494 Returns: pointer to the output string, or NULL if there is an error.
1495 */
1496
1497 static uschar *
1498 compute_nhash (uschar *subject, int value1, int value2, int *len)
1499 {
1500 uschar *s = subject;
1501 int i = 0;
1502 unsigned long int total = 0; /* no overflow */
1503
1504 while (*s != 0)
1505 {
1506 if (i == 0) i = nelem(prime) - 1;
1507 total += prime[i--] * (unsigned int)(*s++);
1508 }
1509
1510 /* If value2 is unset, just compute one number */
1511
1512 if (value2 < 0)
1513 s = string_sprintf("%lu", total % value1);
1514
1515 /* Otherwise do a div/mod hash */
1516
1517 else
1518 {
1519 total = total % (value1 * value2);
1520 s = string_sprintf("%lu/%lu", total/value2, total % value2);
1521 }
1522
1523 *len = Ustrlen(s);
1524 return s;
1525 }
1526
1527
1528
1529
1530
1531 /*************************************************
1532 * Find the value of a header or headers *
1533 *************************************************/
1534
1535 /* Multiple instances of the same header get concatenated, and this function
1536 can also return a concatenation of all the header lines. When concatenating
1537 specific headers that contain lists of addresses, a comma is inserted between
1538 them. Otherwise we use a straight concatenation. Because some messages can have
1539 pathologically large number of lines, there is a limit on the length that is
1540 returned.
1541
1542 Arguments:
1543 name the name of the header, without the leading $header_ or $h_,
1544 or NULL if a concatenation of all headers is required
1545 newsize return the size of memory block that was obtained; may be NULL
1546 if exists_only is TRUE
1547 flags FH_EXISTS_ONLY
1548 set if called from a def: test; don't need to build a string;
1549 just return a string that is not "" and not "0" if the header
1550 exists
1551 FH_WANT_RAW
1552 set if called for $rh_ or $rheader_ items; no processing,
1553 other than concatenating, will be done on the header. Also used
1554 for $message_headers_raw.
1555 FH_WANT_LIST
1556 Double colon chars in the content, and replace newline with
1557 colon between each element when concatenating; returning a
1558 colon-sep list (elements might contain newlines)
1559 charset name of charset to translate MIME words to; used only if
1560 want_raw is false; if NULL, no translation is done (this is
1561 used for $bh_ and $bheader_)
1562
1563 Returns: NULL if the header does not exist, else a pointer to a new
1564 store block
1565 */
1566
1567 static uschar *
1568 find_header(uschar *name, int *newsize, unsigned flags, uschar *charset)
1569 {
1570 BOOL found = !name;
1571 int len = name ? Ustrlen(name) : 0;
1572 BOOL comma = FALSE;
1573 gstring * g = NULL;
1574
1575 for (header_line * h = header_list; h; h = h->next)
1576 if (h->type != htype_old && h->text) /* NULL => Received: placeholder */
1577 if (!name || (len <= h->slen && strncmpic(name, h->text, len) == 0))
1578 {
1579 uschar * s, * t;
1580 size_t inc;
1581
1582 if (flags & FH_EXISTS_ONLY)
1583 return US"1"; /* don't need actual string */
1584
1585 found = TRUE;
1586 s = h->text + len; /* text to insert */
1587 if (!(flags & FH_WANT_RAW)) /* unless wanted raw, */
1588 while (isspace(*s)) s++; /* remove leading white space */
1589 t = h->text + h->slen; /* end-point */
1590
1591 /* Unless wanted raw, remove trailing whitespace, including the
1592 newline. */
1593
1594 if (flags & FH_WANT_LIST)
1595 while (t > s && t[-1] == '\n') t--;
1596 else if (!(flags & FH_WANT_RAW))
1597 {
1598 while (t > s && isspace(t[-1])) t--;
1599
1600 /* Set comma if handling a single header and it's one of those
1601 that contains an address list, except when asked for raw headers. Only
1602 need to do this once. */
1603
1604 if (name && !comma && Ustrchr("BCFRST", h->type)) comma = TRUE;
1605 }
1606
1607 /* Trim the header roughly if we're approaching limits */
1608 inc = t - s;
1609 if ((g ? g->ptr : 0) + inc > header_insert_maxlen)
1610 inc = header_insert_maxlen - (g ? g->ptr : 0);
1611
1612 /* For raw just copy the data; for a list, add the data as a colon-sep
1613 list-element; for comma-list add as an unchecked comma,newline sep
1614 list-elemment; for other nonraw add as an unchecked newline-sep list (we
1615 stripped trailing WS above including the newline). We ignore the potential
1616 expansion due to colon-doubling, just leaving the loop if the limit is met
1617 or exceeded. */
1618
1619 if (flags & FH_WANT_LIST)
1620 g = string_append_listele_n(g, ':', s, (unsigned)inc);
1621 else if (flags & FH_WANT_RAW)
1622 {
1623 g = string_catn(g, s, (unsigned)inc);
1624 (void) string_from_gstring(g);
1625 }
1626 else if (inc > 0)
1627 if (comma)
1628 g = string_append2_listele_n(g, US",\n", s, (unsigned)inc);
1629 else
1630 g = string_append2_listele_n(g, US"\n", s, (unsigned)inc);
1631
1632 if (g && g->ptr >= header_insert_maxlen) break;
1633 }
1634
1635 if (!found) return NULL; /* No header found */
1636 if (!g) return US"";
1637
1638 /* That's all we do for raw header expansion. */
1639
1640 *newsize = g->size;
1641 if (flags & FH_WANT_RAW)
1642 return g->s;
1643
1644 /* Otherwise do RFC 2047 decoding, translating the charset if requested.
1645 The rfc2047_decode2() function can return an error with decoded data if the
1646 charset translation fails. If decoding fails, it returns NULL. */
1647
1648 else
1649 {
1650 uschar *decoded, *error;
1651
1652 decoded = rfc2047_decode2(g->s, check_rfc2047_length, charset, '?', NULL,
1653 newsize, &error);
1654 if (error)
1655 {
1656 DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n"
1657 " input was: %s\n", error, g->s);
1658 }
1659 return decoded ? decoded : g->s;
1660 }
1661 }
1662
1663
1664
1665
1666 /* Append a "local" element to an Authentication-Results: header
1667 if this was a non-smtp message.
1668 */
1669
1670 static gstring *
1671 authres_local(gstring * g, const uschar * sysname)
1672 {
1673 if (!f.authentication_local)
1674 return g;
1675 g = string_append(g, 3, US";\n\tlocal=pass (non-smtp, ", sysname, US")");
1676 if (authenticated_id) g = string_append(g, 2, " u=", authenticated_id);
1677 return g;
1678 }
1679
1680
1681 /* Append an "iprev" element to an Authentication-Results: header
1682 if we have attempted to get the calling host's name.
1683 */
1684
1685 static gstring *
1686 authres_iprev(gstring * g)
1687 {
1688 if (sender_host_name)
1689 g = string_append(g, 3, US";\n\tiprev=pass (", sender_host_name, US")");
1690 else if (host_lookup_deferred)
1691 g = string_catn(g, US";\n\tiprev=temperror", 19);
1692 else if (host_lookup_failed)
1693 g = string_catn(g, US";\n\tiprev=fail", 13);
1694 else
1695 return g;
1696
1697 if (sender_host_address)
1698 g = string_append(g, 2, US" smtp.remote-ip=", sender_host_address);
1699 return g;
1700 }
1701
1702
1703
1704 /*************************************************
1705 * Return list of recipients *
1706 *************************************************/
1707 /* A recipients list is available only during system message filtering,
1708 during ACL processing after DATA, and while expanding pipe commands
1709 generated from a system filter, but not elsewhere. */
1710
1711 static uschar *
1712 fn_recipients(void)
1713 {
1714 uschar * s;
1715 gstring * g = NULL;
1716
1717 if (!f.enable_dollar_recipients) return NULL;
1718
1719 for (int i = 0; i < recipients_count; i++)
1720 {
1721 s = recipients_list[i].address;
1722 g = string_append2_listele_n(g, US", ", s, Ustrlen(s));
1723 }
1724 return g ? g->s : NULL;
1725 }
1726
1727
1728 /*************************************************
1729 * Find value of a variable *
1730 *************************************************/
1731
1732 /* The table of variables is kept in alphabetic order, so we can search it
1733 using a binary chop. The "choplen" variable is nothing to do with the binary
1734 chop.
1735
1736 Arguments:
1737 name the name of the variable being sought
1738 exists_only TRUE if this is a def: test; passed on to find_header()
1739 skipping TRUE => skip any processing evaluation; this is not the same as
1740 exists_only because def: may test for values that are first
1741 evaluated here
1742 newsize pointer to an int which is initially zero; if the answer is in
1743 a new memory buffer, *newsize is set to its size
1744
1745 Returns: NULL if the variable does not exist, or
1746 a pointer to the variable's contents, or
1747 something non-NULL if exists_only is TRUE
1748 */
1749
1750 static uschar *
1751 find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize)
1752 {
1753 var_entry * vp;
1754 uschar *s, *domain;
1755 uschar **ss;
1756 void * val;
1757
1758 /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx.
1759 Originally, xxx had to be a number in the range 0-9 (later 0-19), but from
1760 release 4.64 onwards arbitrary names are permitted, as long as the first 5
1761 characters are acl_c or acl_m and the sixth is either a digit or an underscore
1762 (this gave backwards compatibility at the changeover). There may be built-in
1763 variables whose names start acl_ but they should never start in this way. This
1764 slightly messy specification is a consequence of the history, needless to say.
1765
1766 If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is
1767 set, in which case give an error. */
1768
1769 if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) &&
1770 !isalpha(name[5]))
1771 {
1772 tree_node *node =
1773 tree_search((name[4] == 'c')? acl_var_c : acl_var_m, name + 4);
1774 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1775 }
1776
1777 /* Handle $auth<n> variables. */
1778
1779 if (Ustrncmp(name, "auth", 4) == 0)
1780 {
1781 uschar *endptr;
1782 int n = Ustrtoul(name + 4, &endptr, 10);
1783 if (*endptr == 0 && n != 0 && n <= AUTH_VARS)
1784 return !auth_vars[n-1] ? US"" : auth_vars[n-1];
1785 }
1786 else if (Ustrncmp(name, "regex", 5) == 0)
1787 {
1788 uschar *endptr;
1789 int n = Ustrtoul(name + 5, &endptr, 10);
1790 if (*endptr == 0 && n != 0 && n <= REGEX_VARS)
1791 return !regex_vars[n-1] ? US"" : regex_vars[n-1];
1792 }
1793
1794 /* For all other variables, search the table */
1795
1796 if (!(vp = find_var_ent(name)))
1797 return NULL; /* Unknown variable name */
1798
1799 /* Found an existing variable. If in skipping state, the value isn't needed,
1800 and we want to avoid processing (such as looking up the host name). */
1801
1802 if (skipping)
1803 return US"";
1804
1805 val = vp->value;
1806 switch (vp->type)
1807 {
1808 case vtype_filter_int:
1809 if (!f.filter_running) return NULL;
1810 /* Fall through */
1811 /* VVVVVVVVVVVV */
1812 case vtype_int:
1813 sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */
1814 return var_buffer;
1815
1816 case vtype_ino:
1817 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */
1818 return var_buffer;
1819
1820 case vtype_gid:
1821 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */
1822 return var_buffer;
1823
1824 case vtype_uid:
1825 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */
1826 return var_buffer;
1827
1828 case vtype_bool:
1829 sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */
1830 return var_buffer;
1831
1832 case vtype_stringptr: /* Pointer to string */
1833 return (s = *((uschar **)(val))) ? s : US"";
1834
1835 case vtype_pid:
1836 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
1837 return var_buffer;
1838
1839 case vtype_load_avg:
1840 sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */
1841 return var_buffer;
1842
1843 case vtype_host_lookup: /* Lookup if not done so */
1844 if ( !sender_host_name && sender_host_address
1845 && !host_lookup_failed && host_name_lookup() == OK)
1846 host_build_sender_fullhost();
1847 return sender_host_name ? sender_host_name : US"";
1848
1849 case vtype_localpart: /* Get local part from address */
1850 s = *((uschar **)(val));
1851 if (s == NULL) return US"";
1852 domain = Ustrrchr(s, '@');
1853 if (domain == NULL) return s;
1854 if (domain - s > sizeof(var_buffer) - 1)
1855 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT
1856 " in string expansion", sizeof(var_buffer));
1857 Ustrncpy(var_buffer, s, domain - s);
1858 var_buffer[domain - s] = 0;
1859 return var_buffer;
1860
1861 case vtype_domain: /* Get domain from address */
1862 s = *((uschar **)(val));
1863 if (s == NULL) return US"";
1864 domain = Ustrrchr(s, '@');
1865 return (domain == NULL)? US"" : domain + 1;
1866
1867 case vtype_msgheaders:
1868 return find_header(NULL, newsize, exists_only ? FH_EXISTS_ONLY : 0, NULL);
1869
1870 case vtype_msgheaders_raw:
1871 return find_header(NULL, newsize,
1872 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW, NULL);
1873
1874 case vtype_msgbody: /* Pointer to msgbody string */
1875 case vtype_msgbody_end: /* Ditto, the end of the msg */
1876 ss = (uschar **)(val);
1877 if (!*ss && deliver_datafile >= 0) /* Read body when needed */
1878 {
1879 uschar *body;
1880 off_t start_offset = SPOOL_DATA_START_OFFSET;
1881 int len = message_body_visible;
1882 if (len > message_size) len = message_size;
1883 *ss = body = store_malloc(len+1);
1884 body[0] = 0;
1885 if (vp->type == vtype_msgbody_end)
1886 {
1887 struct stat statbuf;
1888 if (fstat(deliver_datafile, &statbuf) == 0)
1889 {
1890 start_offset = statbuf.st_size - len;
1891 if (start_offset < SPOOL_DATA_START_OFFSET)
1892 start_offset = SPOOL_DATA_START_OFFSET;
1893 }
1894 }
1895 if (lseek(deliver_datafile, start_offset, SEEK_SET) < 0)
1896 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "deliver_datafile lseek: %s",
1897 strerror(errno));
1898 len = read(deliver_datafile, body, len);
1899 if (len > 0)
1900 {
1901 body[len] = 0;
1902 if (message_body_newlines) /* Separate loops for efficiency */
1903 while (len > 0)
1904 { if (body[--len] == 0) body[len] = ' '; }
1905 else
1906 while (len > 0)
1907 { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; }
1908 }
1909 }
1910 return *ss ? *ss : US"";
1911
1912 case vtype_todbsdin: /* BSD inbox time of day */
1913 return tod_stamp(tod_bsdin);
1914
1915 case vtype_tode: /* Unix epoch time of day */
1916 return tod_stamp(tod_epoch);
1917
1918 case vtype_todel: /* Unix epoch/usec time of day */
1919 return tod_stamp(tod_epoch_l);
1920
1921 case vtype_todf: /* Full time of day */
1922 return tod_stamp(tod_full);
1923
1924 case vtype_todl: /* Log format time of day */
1925 return tod_stamp(tod_log_bare); /* (without timezone) */
1926
1927 case vtype_todzone: /* Time zone offset only */
1928 return tod_stamp(tod_zone);
1929
1930 case vtype_todzulu: /* Zulu time */
1931 return tod_stamp(tod_zulu);
1932
1933 case vtype_todlf: /* Log file datestamp tod */
1934 return tod_stamp(tod_log_datestamp_daily);
1935
1936 case vtype_reply: /* Get reply address */
1937 s = find_header(US"reply-to:", newsize,
1938 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
1939 headers_charset);
1940 if (s) while (isspace(*s)) s++;
1941 if (!s || !*s)
1942 {
1943 *newsize = 0; /* For the *s==0 case */
1944 s = find_header(US"from:", newsize,
1945 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
1946 headers_charset);
1947 }
1948 if (s)
1949 {
1950 uschar *t;
1951 while (isspace(*s)) s++;
1952 for (t = s; *t != 0; t++) if (*t == '\n') *t = ' ';
1953 while (t > s && isspace(t[-1])) t--;
1954 *t = 0;
1955 }
1956 return s ? s : US"";
1957
1958 case vtype_string_func:
1959 {
1960 uschar * (*fn)() = val;
1961 return fn();
1962 }
1963
1964 case vtype_pspace:
1965 {
1966 int inodes;
1967 sprintf(CS var_buffer, PR_EXIM_ARITH,
1968 receive_statvfs(val == (void *)TRUE, &inodes));
1969 }
1970 return var_buffer;
1971
1972 case vtype_pinodes:
1973 {
1974 int inodes;
1975 (void) receive_statvfs(val == (void *)TRUE, &inodes);
1976 sprintf(CS var_buffer, "%d", inodes);
1977 }
1978 return var_buffer;
1979
1980 case vtype_cert:
1981 return *(void **)val ? US"<cert>" : US"";
1982
1983 #ifndef DISABLE_DKIM
1984 case vtype_dkim:
1985 return dkim_exim_expand_query((int)(long)val);
1986 #endif
1987
1988 }
1989
1990 return NULL; /* Unknown variable. Silences static checkers. */
1991 }
1992
1993
1994
1995
1996 void
1997 modify_variable(uschar *name, void * value)
1998 {
1999 var_entry * vp;
2000 if ((vp = find_var_ent(name))) vp->value = value;
2001 return; /* Unknown variable name, fail silently */
2002 }
2003
2004
2005
2006
2007
2008
2009 /*************************************************
2010 * Read and expand substrings *
2011 *************************************************/
2012
2013 /* This function is called to read and expand argument substrings for various
2014 expansion items. Some have a minimum requirement that is less than the maximum;
2015 in these cases, the first non-present one is set to NULL.
2016
2017 Arguments:
2018 sub points to vector of pointers to set
2019 n maximum number of substrings
2020 m minimum required
2021 sptr points to current string pointer
2022 skipping the skipping flag
2023 check_end if TRUE, check for final '}'
2024 name name of item, for error message
2025 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
2026 the store.
2027
2028 Returns: 0 OK; string pointer updated
2029 1 curly bracketing error (too few arguments)
2030 2 too many arguments (only if check_end is set); message set
2031 3 other error (expansion failure)
2032 */
2033
2034 static int
2035 read_subs(uschar **sub, int n, int m, const uschar **sptr, BOOL skipping,
2036 BOOL check_end, uschar *name, BOOL *resetok)
2037 {
2038 const uschar *s = *sptr;
2039
2040 while (isspace(*s)) s++;
2041 for (int i = 0; i < n; i++)
2042 {
2043 if (*s != '{')
2044 {
2045 if (i < m)
2046 {
2047 expand_string_message = string_sprintf("Not enough arguments for '%s' "
2048 "(min is %d)", name, m);
2049 return 1;
2050 }
2051 sub[i] = NULL;
2052 break;
2053 }
2054 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, resetok)))
2055 return 3;
2056 if (*s++ != '}') return 1;
2057 while (isspace(*s)) s++;
2058 }
2059 if (check_end && *s++ != '}')
2060 {
2061 if (s[-1] == '{')
2062 {
2063 expand_string_message = string_sprintf("Too many arguments for '%s' "
2064 "(max is %d)", name, n);
2065 return 2;
2066 }
2067 expand_string_message = string_sprintf("missing '}' after '%s'", name);
2068 return 1;
2069 }
2070
2071 *sptr = s;
2072 return 0;
2073 }
2074
2075
2076
2077
2078 /*************************************************
2079 * Elaborate message for bad variable *
2080 *************************************************/
2081
2082 /* For the "unknown variable" message, take a look at the variable's name, and
2083 give additional information about possible ACL variables. The extra information
2084 is added on to expand_string_message.
2085
2086 Argument: the name of the variable
2087 Returns: nothing
2088 */
2089
2090 static void
2091 check_variable_error_message(uschar *name)
2092 {
2093 if (Ustrncmp(name, "acl_", 4) == 0)
2094 expand_string_message = string_sprintf("%s (%s)", expand_string_message,
2095 (name[4] == 'c' || name[4] == 'm')?
2096 (isalpha(name[5])?
2097 US"6th character of a user-defined ACL variable must be a digit or underscore" :
2098 US"strict_acl_vars is set" /* Syntax is OK, it has to be this */
2099 ) :
2100 US"user-defined ACL variables must start acl_c or acl_m");
2101 }
2102
2103
2104
2105 /*
2106 Load args from sub array to globals, and call acl_check().
2107 Sub array will be corrupted on return.
2108
2109 Returns: OK access is granted by an ACCEPT verb
2110 DISCARD access is (apparently) granted by a DISCARD verb
2111 FAIL access is denied
2112 FAIL_DROP access is denied; drop the connection
2113 DEFER can't tell at the moment
2114 ERROR disaster
2115 */
2116 static int
2117 eval_acl(uschar ** sub, int nsub, uschar ** user_msgp)
2118 {
2119 int i;
2120 int sav_narg = acl_narg;
2121 int ret;
2122 uschar * dummy_logmsg;
2123 extern int acl_where;
2124
2125 if(--nsub > nelem(acl_arg)) nsub = nelem(acl_arg);
2126 for (i = 0; i < nsub && sub[i+1]; i++)
2127 {
2128 uschar * tmp = acl_arg[i];
2129 acl_arg[i] = sub[i+1]; /* place callers args in the globals */
2130 sub[i+1] = tmp; /* stash the old args using our caller's storage */
2131 }
2132 acl_narg = i;
2133 while (i < nsub)
2134 {
2135 sub[i+1] = acl_arg[i];
2136 acl_arg[i++] = NULL;
2137 }
2138
2139 DEBUG(D_expand)
2140 debug_printf_indent("expanding: acl: %s arg: %s%s\n",
2141 sub[0],
2142 acl_narg>0 ? acl_arg[0] : US"<none>",
2143 acl_narg>1 ? " +more" : "");
2144
2145 ret = acl_eval(acl_where, sub[0], user_msgp, &dummy_logmsg);
2146
2147 for (i = 0; i < nsub; i++)
2148 acl_arg[i] = sub[i+1]; /* restore old args */
2149 acl_narg = sav_narg;
2150
2151 return ret;
2152 }
2153
2154
2155
2156
2157 /* Return pointer to dewrapped string, with enclosing specified chars removed.
2158 The given string is modified on return. Leading whitespace is skipped while
2159 looking for the opening wrap character, then the rest is scanned for the trailing
2160 (non-escaped) wrap character. A backslash in the string will act as an escape.
2161
2162 A nul is written over the trailing wrap, and a pointer to the char after the
2163 leading wrap is returned.
2164
2165 Arguments:
2166 s String for de-wrapping
2167 wrap Two-char string, the first being the opener, second the closer wrapping
2168 character
2169 Return:
2170 Pointer to de-wrapped string, or NULL on error (with expand_string_message set).
2171 */
2172
2173 static uschar *
2174 dewrap(uschar * s, const uschar * wrap)
2175 {
2176 uschar * p = s;
2177 unsigned depth = 0;
2178 BOOL quotesmode = wrap[0] == wrap[1];
2179
2180 while (isspace(*p)) p++;
2181
2182 if (*p == *wrap)
2183 {
2184 s = ++p;
2185 wrap++;
2186 while (*p)
2187 {
2188 if (*p == '\\') p++;
2189 else if (!quotesmode && *p == wrap[-1]) depth++;
2190 else if (*p == *wrap)
2191 if (depth == 0)
2192 {
2193 *p = '\0';
2194 return s;
2195 }
2196 else
2197 depth--;
2198 p++;
2199 }
2200 }
2201 expand_string_message = string_sprintf("missing '%c'", *wrap);
2202 return NULL;
2203 }
2204
2205
2206 /* Pull off the leading array or object element, returning
2207 a copy in an allocated string. Update the list pointer.
2208
2209 The element may itself be an abject or array.
2210 Return NULL when the list is empty.
2211 */
2212
2213 static uschar *
2214 json_nextinlist(const uschar ** list)
2215 {
2216 unsigned array_depth = 0, object_depth = 0;
2217 const uschar * s = *list, * item;
2218
2219 while (isspace(*s)) s++;
2220
2221 for (item = s;
2222 *s && (*s != ',' || array_depth != 0 || object_depth != 0);
2223 s++)
2224 switch (*s)
2225 {
2226 case '[': array_depth++; break;
2227 case ']': array_depth--; break;
2228 case '{': object_depth++; break;
2229 case '}': object_depth--; break;
2230 }
2231 *list = *s ? s+1 : s;
2232 if (item == s) return NULL;
2233 item = string_copyn(item, s - item);
2234 DEBUG(D_expand) debug_printf_indent(" json ele: '%s'\n", item);
2235 return US item;
2236 }
2237
2238
2239
2240 /*************************************************
2241 * Read and evaluate a condition *
2242 *************************************************/
2243
2244 /*
2245 Arguments:
2246 s points to the start of the condition text
2247 resetok points to a BOOL which is written false if it is unsafe to
2248 free memory. Certain condition types (acl) may have side-effect
2249 allocation which must be preserved.
2250 yield points to a BOOL to hold the result of the condition test;
2251 if NULL, we are just reading through a condition that is
2252 part of an "or" combination to check syntax, or in a state
2253 where the answer isn't required
2254
2255 Returns: a pointer to the first character after the condition, or
2256 NULL after an error
2257 */
2258
2259 static const uschar *
2260 eval_condition(const uschar *s, BOOL *resetok, BOOL *yield)
2261 {
2262 BOOL testfor = TRUE;
2263 BOOL tempcond, combined_cond;
2264 BOOL *subcondptr;
2265 BOOL sub2_honour_dollar = TRUE;
2266 BOOL is_forany, is_json, is_jsons;
2267 int rc, cond_type, roffset;
2268 int_eximarith_t num[2];
2269 struct stat statbuf;
2270 uschar name[256];
2271 const uschar *sub[10];
2272
2273 const pcre *re;
2274 const uschar *rerror;
2275
2276 for (;;)
2277 {
2278 while (isspace(*s)) s++;
2279 if (*s == '!') { testfor = !testfor; s++; } else break;
2280 }
2281
2282 /* Numeric comparisons are symbolic */
2283
2284 if (*s == '=' || *s == '>' || *s == '<')
2285 {
2286 int p = 0;
2287 name[p++] = *s++;
2288 if (*s == '=')
2289 {
2290 name[p++] = '=';
2291 s++;
2292 }
2293 name[p] = 0;
2294 }
2295
2296 /* All other conditions are named */
2297
2298 else s = read_name(name, 256, s, US"_");
2299
2300 /* If we haven't read a name, it means some non-alpha character is first. */
2301
2302 if (name[0] == 0)
2303 {
2304 expand_string_message = string_sprintf("condition name expected, "
2305 "but found \"%.16s\"", s);
2306 return NULL;
2307 }
2308
2309 /* Find which condition we are dealing with, and switch on it */
2310
2311 cond_type = chop_match(name, cond_table, nelem(cond_table));
2312 switch(cond_type)
2313 {
2314 /* def: tests for a non-empty variable, or for the existence of a header. If
2315 yield == NULL we are in a skipping state, and don't care about the answer. */
2316
2317 case ECOND_DEF:
2318 {
2319 uschar * t;
2320
2321 if (*s != ':')
2322 {
2323 expand_string_message = US"\":\" expected after \"def\"";
2324 return NULL;
2325 }
2326
2327 s = read_name(name, 256, s+1, US"_");
2328
2329 /* Test for a header's existence. If the name contains a closing brace
2330 character, this may be a user error where the terminating colon has been
2331 omitted. Set a flag to adjust a subsequent error message in this case. */
2332
2333 if ( ( *(t = name) == 'h'
2334 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
2335 )
2336 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
2337 )
2338 {
2339 s = read_header_name(name, 256, s);
2340 /* {-for-text-editors */
2341 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
2342 if (yield) *yield =
2343 (find_header(name, NULL, FH_EXISTS_ONLY, NULL) != NULL) == testfor;
2344 }
2345
2346 /* Test for a variable's having a non-empty value. A non-existent variable
2347 causes an expansion failure. */
2348
2349 else
2350 {
2351 if (!(t = find_variable(name, TRUE, yield == NULL, NULL)))
2352 {
2353 expand_string_message = (name[0] == 0)?
2354 string_sprintf("variable name omitted after \"def:\"") :
2355 string_sprintf("unknown variable \"%s\" after \"def:\"", name);
2356 check_variable_error_message(name);
2357 return NULL;
2358 }
2359 if (yield) *yield = (t[0] != 0) == testfor;
2360 }
2361
2362 return s;
2363 }
2364
2365
2366 /* first_delivery tests for first delivery attempt */
2367
2368 case ECOND_FIRST_DELIVERY:
2369 if (yield != NULL) *yield = f.deliver_firsttime == testfor;
2370 return s;
2371
2372
2373 /* queue_running tests for any process started by a queue runner */
2374
2375 case ECOND_QUEUE_RUNNING:
2376 if (yield != NULL) *yield = (queue_run_pid != (pid_t)0) == testfor;
2377 return s;
2378
2379
2380 /* exists: tests for file existence
2381 isip: tests for any IP address
2382 isip4: tests for an IPv4 address
2383 isip6: tests for an IPv6 address
2384 pam: does PAM authentication
2385 radius: does RADIUS authentication
2386 ldapauth: does LDAP authentication
2387 pwcheck: does Cyrus SASL pwcheck authentication
2388 */
2389
2390 case ECOND_EXISTS:
2391 case ECOND_ISIP:
2392 case ECOND_ISIP4:
2393 case ECOND_ISIP6:
2394 case ECOND_PAM:
2395 case ECOND_RADIUS:
2396 case ECOND_LDAPAUTH:
2397 case ECOND_PWCHECK:
2398
2399 while (isspace(*s)) s++;
2400 if (*s != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2401
2402 sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL, TRUE, resetok);
2403 if (sub[0] == NULL) return NULL;
2404 /* {-for-text-editors */
2405 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2406
2407 if (yield == NULL) return s; /* No need to run the test if skipping */
2408
2409 switch(cond_type)
2410 {
2411 case ECOND_EXISTS:
2412 if ((expand_forbid & RDO_EXISTS) != 0)
2413 {
2414 expand_string_message = US"File existence tests are not permitted";
2415 return NULL;
2416 }
2417 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
2418 break;
2419
2420 case ECOND_ISIP:
2421 case ECOND_ISIP4:
2422 case ECOND_ISIP6:
2423 rc = string_is_ip_address(sub[0], NULL);
2424 *yield = ((cond_type == ECOND_ISIP)? (rc != 0) :
2425 (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor;
2426 break;
2427
2428 /* Various authentication tests - all optionally compiled */
2429
2430 case ECOND_PAM:
2431 #ifdef SUPPORT_PAM
2432 rc = auth_call_pam(sub[0], &expand_string_message);
2433 goto END_AUTH;
2434 #else
2435 goto COND_FAILED_NOT_COMPILED;
2436 #endif /* SUPPORT_PAM */
2437
2438 case ECOND_RADIUS:
2439 #ifdef RADIUS_CONFIG_FILE
2440 rc = auth_call_radius(sub[0], &expand_string_message);
2441 goto END_AUTH;
2442 #else
2443 goto COND_FAILED_NOT_COMPILED;
2444 #endif /* RADIUS_CONFIG_FILE */
2445
2446 case ECOND_LDAPAUTH:
2447 #ifdef LOOKUP_LDAP
2448 {
2449 /* Just to keep the interface the same */
2450 BOOL do_cache;
2451 int old_pool = store_pool;
2452 store_pool = POOL_SEARCH;
2453 rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL,
2454 &expand_string_message, &do_cache);
2455 store_pool = old_pool;
2456 }
2457 goto END_AUTH;
2458 #else
2459 goto COND_FAILED_NOT_COMPILED;
2460 #endif /* LOOKUP_LDAP */
2461
2462 case ECOND_PWCHECK:
2463 #ifdef CYRUS_PWCHECK_SOCKET
2464 rc = auth_call_pwcheck(sub[0], &expand_string_message);
2465 goto END_AUTH;
2466 #else
2467 goto COND_FAILED_NOT_COMPILED;
2468 #endif /* CYRUS_PWCHECK_SOCKET */
2469
2470 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
2471 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
2472 END_AUTH:
2473 if (rc == ERROR || rc == DEFER) return NULL;
2474 *yield = (rc == OK) == testfor;
2475 #endif
2476 }
2477 return s;
2478
2479
2480 /* call ACL (in a conditional context). Accept true, deny false.
2481 Defer is a forced-fail. Anything set by message= goes to $value.
2482 Up to ten parameters are used; we use the braces round the name+args
2483 like the saslauthd condition does, to permit a variable number of args.
2484 See also the expansion-item version EITEM_ACL and the traditional
2485 acl modifier ACLC_ACL.
2486 Since the ACL may allocate new global variables, tell our caller to not
2487 reclaim memory.
2488 */
2489
2490 case ECOND_ACL:
2491 /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */
2492 {
2493 uschar *sub[10];
2494 uschar *user_msg;
2495 BOOL cond = FALSE;
2496
2497 while (isspace(*s)) s++;
2498 if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/
2499
2500 switch(read_subs(sub, nelem(sub), 1,
2501 &s, yield == NULL, TRUE, US"acl", resetok))
2502 {
2503 case 1: expand_string_message = US"too few arguments or bracketing "
2504 "error for acl";
2505 case 2:
2506 case 3: return NULL;
2507 }
2508
2509 if (yield != NULL)
2510 {
2511 *resetok = FALSE; /* eval_acl() might allocate; do not reclaim */
2512 switch(eval_acl(sub, nelem(sub), &user_msg))
2513 {
2514 case OK:
2515 cond = TRUE;
2516 case FAIL:
2517 lookup_value = NULL;
2518 if (user_msg)
2519 lookup_value = string_copy(user_msg);
2520 *yield = cond == testfor;
2521 break;
2522
2523 case DEFER:
2524 f.expand_string_forcedfail = TRUE;
2525 /*FALLTHROUGH*/
2526 default:
2527 expand_string_message = string_sprintf("error from acl \"%s\"", sub[0]);
2528 return NULL;
2529 }
2530 }
2531 return s;
2532 }
2533
2534
2535 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
2536
2537 ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}}
2538
2539 However, the last two are optional. That is why the whole set is enclosed
2540 in their own set of braces. */
2541
2542 case ECOND_SASLAUTHD:
2543 #ifndef CYRUS_SASLAUTHD_SOCKET
2544 goto COND_FAILED_NOT_COMPILED;
2545 #else
2546 {
2547 uschar *sub[4];
2548 while (isspace(*s)) s++;
2549 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2550 switch(read_subs(sub, nelem(sub), 2, &s, yield == NULL, TRUE, US"saslauthd",
2551 resetok))
2552 {
2553 case 1: expand_string_message = US"too few arguments or bracketing "
2554 "error for saslauthd";
2555 case 2:
2556 case 3: return NULL;
2557 }
2558 if (sub[2] == NULL) sub[3] = NULL; /* realm if no service */
2559 if (yield != NULL)
2560 {
2561 int rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
2562 &expand_string_message);
2563 if (rc == ERROR || rc == DEFER) return NULL;
2564 *yield = (rc == OK) == testfor;
2565 }
2566 return s;
2567 }
2568 #endif /* CYRUS_SASLAUTHD_SOCKET */
2569
2570
2571 /* symbolic operators for numeric and string comparison, and a number of
2572 other operators, all requiring two arguments.
2573
2574 crypteq: encrypts plaintext and compares against an encrypted text,
2575 using crypt(), crypt16(), MD5 or SHA-1
2576 inlist/inlisti: checks if first argument is in the list of the second
2577 match: does a regular expression match and sets up the numerical
2578 variables if it succeeds
2579 match_address: matches in an address list
2580 match_domain: matches in a domain list
2581 match_ip: matches a host list that is restricted to IP addresses
2582 match_local_part: matches in a local part list
2583 */
2584
2585 case ECOND_MATCH_ADDRESS:
2586 case ECOND_MATCH_DOMAIN:
2587 case ECOND_MATCH_IP:
2588 case ECOND_MATCH_LOCAL_PART:
2589 #ifndef EXPAND_LISTMATCH_RHS
2590 sub2_honour_dollar = FALSE;
2591 #endif
2592 /* FALLTHROUGH */
2593
2594 case ECOND_CRYPTEQ:
2595 case ECOND_INLIST:
2596 case ECOND_INLISTI:
2597 case ECOND_MATCH:
2598
2599 case ECOND_NUM_L: /* Numerical comparisons */
2600 case ECOND_NUM_LE:
2601 case ECOND_NUM_E:
2602 case ECOND_NUM_EE:
2603 case ECOND_NUM_G:
2604 case ECOND_NUM_GE:
2605
2606 case ECOND_STR_LT: /* String comparisons */
2607 case ECOND_STR_LTI:
2608 case ECOND_STR_LE:
2609 case ECOND_STR_LEI:
2610 case ECOND_STR_EQ:
2611 case ECOND_STR_EQI:
2612 case ECOND_STR_GT:
2613 case ECOND_STR_GTI:
2614 case ECOND_STR_GE:
2615 case ECOND_STR_GEI:
2616
2617 for (int i = 0; i < 2; i++)
2618 {
2619 /* Sometimes, we don't expand substrings; too many insecure configurations
2620 created using match_address{}{} and friends, where the second param
2621 includes information from untrustworthy sources. */
2622 BOOL honour_dollar = TRUE;
2623 if ((i > 0) && !sub2_honour_dollar)
2624 honour_dollar = FALSE;
2625
2626 while (isspace(*s)) s++;
2627 if (*s != '{')
2628 {
2629 if (i == 0) goto COND_FAILED_CURLY_START;
2630 expand_string_message = string_sprintf("missing 2nd string in {} "
2631 "after \"%s\"", name);
2632 return NULL;
2633 }
2634 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL,
2635 honour_dollar, resetok)))
2636 return NULL;
2637 DEBUG(D_expand) if (i == 1 && !sub2_honour_dollar && Ustrchr(sub[1], '$'))
2638 debug_printf_indent("WARNING: the second arg is NOT expanded,"
2639 " for security reasons\n");
2640 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2641
2642 /* Convert to numerical if required; we know that the names of all the
2643 conditions that compare numbers do not start with a letter. This just saves
2644 checking for them individually. */
2645
2646 if (!isalpha(name[0]) && yield != NULL)
2647 if (sub[i][0] == 0)
2648 {
2649 num[i] = 0;
2650 DEBUG(D_expand)
2651 debug_printf_indent("empty string cast to zero for numerical comparison\n");
2652 }
2653 else
2654 {
2655 num[i] = expanded_string_integer(sub[i], FALSE);
2656 if (expand_string_message != NULL) return NULL;
2657 }
2658 }
2659
2660 /* Result not required */
2661
2662 if (yield == NULL) return s;
2663
2664 /* Do an appropriate comparison */
2665
2666 switch(cond_type)
2667 {
2668 case ECOND_NUM_E:
2669 case ECOND_NUM_EE:
2670 tempcond = (num[0] == num[1]);
2671 break;
2672
2673 case ECOND_NUM_G:
2674 tempcond = (num[0] > num[1]);
2675 break;
2676
2677 case ECOND_NUM_GE:
2678 tempcond = (num[0] >= num[1]);
2679 break;
2680
2681 case ECOND_NUM_L:
2682 tempcond = (num[0] < num[1]);
2683 break;
2684
2685 case ECOND_NUM_LE:
2686 tempcond = (num[0] <= num[1]);
2687 break;
2688
2689 case ECOND_STR_LT:
2690 tempcond = (Ustrcmp(sub[0], sub[1]) < 0);
2691 break;
2692
2693 case ECOND_STR_LTI:
2694 tempcond = (strcmpic(sub[0], sub[1]) < 0);
2695 break;
2696
2697 case ECOND_STR_LE:
2698 tempcond = (Ustrcmp(sub[0], sub[1]) <= 0);
2699 break;
2700
2701 case ECOND_STR_LEI:
2702 tempcond = (strcmpic(sub[0], sub[1]) <= 0);
2703 break;
2704
2705 case ECOND_STR_EQ:
2706 tempcond = (Ustrcmp(sub[0], sub[1]) == 0);
2707 break;
2708
2709 case ECOND_STR_EQI:
2710 tempcond = (strcmpic(sub[0], sub[1]) == 0);
2711 break;
2712
2713 case ECOND_STR_GT:
2714 tempcond = (Ustrcmp(sub[0], sub[1]) > 0);
2715 break;
2716
2717 case ECOND_STR_GTI:
2718 tempcond = (strcmpic(sub[0], sub[1]) > 0);
2719 break;
2720
2721 case ECOND_STR_GE:
2722 tempcond = (Ustrcmp(sub[0], sub[1]) >= 0);
2723 break;
2724
2725 case ECOND_STR_GEI:
2726 tempcond = (strcmpic(sub[0], sub[1]) >= 0);
2727 break;
2728
2729 case ECOND_MATCH: /* Regular expression match */
2730 re = pcre_compile(CS sub[1], PCRE_COPT, (const char **)&rerror, &roffset,
2731 NULL);
2732 if (re == NULL)
2733 {
2734 expand_string_message = string_sprintf("regular expression error in "
2735 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
2736 return NULL;
2737 }
2738 tempcond = regex_match_and_setup(re, sub[0], 0, -1);
2739 break;
2740
2741 case ECOND_MATCH_ADDRESS: /* Match in an address list */
2742 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0, NULL);
2743 goto MATCHED_SOMETHING;
2744
2745 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
2746 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
2747 MCL_DOMAIN + MCL_NOEXPAND, TRUE, NULL);
2748 goto MATCHED_SOMETHING;
2749
2750 case ECOND_MATCH_IP: /* Match IP address in a host list */
2751 if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0)
2752 {
2753 expand_string_message = string_sprintf("\"%s\" is not an IP address",
2754 sub[0]);
2755 return NULL;
2756 }
2757 else
2758 {
2759 unsigned int *nullcache = NULL;
2760 check_host_block cb;
2761
2762 cb.host_name = US"";
2763 cb.host_address = sub[0];
2764
2765 /* If the host address starts off ::ffff: it is an IPv6 address in
2766 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
2767 addresses. */
2768
2769 cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)?
2770 cb.host_address + 7 : cb.host_address;
2771
2772 rc = match_check_list(
2773 &sub[1], /* the list */
2774 0, /* separator character */
2775 &hostlist_anchor, /* anchor pointer */
2776 &nullcache, /* cache pointer */
2777 check_host, /* function for testing */
2778 &cb, /* argument for function */
2779 MCL_HOST, /* type of check */
2780 sub[0], /* text for debugging */
2781 NULL); /* where to pass back data */
2782 }
2783 goto MATCHED_SOMETHING;
2784
2785 case ECOND_MATCH_LOCAL_PART:
2786 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
2787 MCL_LOCALPART + MCL_NOEXPAND, TRUE, NULL);
2788 /* Fall through */
2789 /* VVVVVVVVVVVV */
2790 MATCHED_SOMETHING:
2791 switch(rc)
2792 {
2793 case OK:
2794 tempcond = TRUE;
2795 break;
2796
2797 case FAIL:
2798 tempcond = FALSE;
2799 break;
2800
2801 case DEFER:
2802 expand_string_message = string_sprintf("unable to complete match "
2803 "against \"%s\": %s", sub[1], search_error_message);
2804 return NULL;
2805 }
2806
2807 break;
2808
2809 /* Various "encrypted" comparisons. If the second string starts with
2810 "{" then an encryption type is given. Default to crypt() or crypt16()
2811 (build-time choice). */
2812 /* }-for-text-editors */
2813
2814 case ECOND_CRYPTEQ:
2815 #ifndef SUPPORT_CRYPTEQ
2816 goto COND_FAILED_NOT_COMPILED;
2817 #else
2818 if (strncmpic(sub[1], US"{md5}", 5) == 0)
2819 {
2820 int sublen = Ustrlen(sub[1]+5);
2821 md5 base;
2822 uschar digest[16];
2823
2824 md5_start(&base);
2825 md5_end(&base, sub[0], Ustrlen(sub[0]), digest);
2826
2827 /* If the length that we are comparing against is 24, the MD5 digest
2828 is expressed as a base64 string. This is the way LDAP does it. However,
2829 some other software uses a straightforward hex representation. We assume
2830 this if the length is 32. Other lengths fail. */
2831
2832 if (sublen == 24)
2833 {
2834 uschar *coded = b64encode(CUS digest, 16);
2835 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
2836 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
2837 tempcond = (Ustrcmp(coded, sub[1]+5) == 0);
2838 }
2839 else if (sublen == 32)
2840 {
2841 uschar coded[36];
2842 for (int i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
2843 coded[32] = 0;
2844 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
2845 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
2846 tempcond = (strcmpic(coded, sub[1]+5) == 0);
2847 }
2848 else
2849 {
2850 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
2851 "fail\n crypted=%s\n", sub[1]+5);
2852 tempcond = FALSE;
2853 }
2854 }
2855
2856 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
2857 {
2858 int sublen = Ustrlen(sub[1]+6);
2859 hctx h;
2860 uschar digest[20];
2861
2862 sha1_start(&h);
2863 sha1_end(&h, sub[0], Ustrlen(sub[0]), digest);
2864
2865 /* If the length that we are comparing against is 28, assume the SHA1
2866 digest is expressed as a base64 string. If the length is 40, assume a
2867 straightforward hex representation. Other lengths fail. */
2868
2869 if (sublen == 28)
2870 {
2871 uschar *coded = b64encode(CUS digest, 20);
2872 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
2873 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
2874 tempcond = (Ustrcmp(coded, sub[1]+6) == 0);
2875 }
2876 else if (sublen == 40)
2877 {
2878 uschar coded[44];
2879 for (int i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
2880 coded[40] = 0;
2881 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
2882 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
2883 tempcond = (strcmpic(coded, sub[1]+6) == 0);
2884 }
2885 else
2886 {
2887 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
2888 "fail\n crypted=%s\n", sub[1]+6);
2889 tempcond = FALSE;
2890 }
2891 }
2892
2893 else /* {crypt} or {crypt16} and non-{ at start */
2894 /* }-for-text-editors */
2895 {
2896 int which = 0;
2897 uschar *coded;
2898
2899 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
2900 {
2901 sub[1] += 7;
2902 which = 1;
2903 }
2904 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
2905 {
2906 sub[1] += 9;
2907 which = 2;
2908 }
2909 else if (sub[1][0] == '{') /* }-for-text-editors */
2910 {
2911 expand_string_message = string_sprintf("unknown encryption mechanism "
2912 "in \"%s\"", sub[1]);
2913 return NULL;
2914 }
2915
2916 switch(which)
2917 {
2918 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
2919 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
2920 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
2921 }
2922
2923 #define STR(s) # s
2924 #define XSTR(s) STR(s)
2925 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
2926 " subject=%s\n crypted=%s\n",
2927 which == 0 ? XSTR(DEFAULT_CRYPT) : which == 1 ? "crypt" : "crypt16",
2928 coded, sub[1]);
2929 #undef STR
2930 #undef XSTR
2931
2932 /* If the encrypted string contains fewer than two characters (for the
2933 salt), force failure. Otherwise we get false positives: with an empty
2934 string the yield of crypt() is an empty string! */
2935
2936 if (coded)
2937 tempcond = Ustrlen(sub[1]) < 2 ? FALSE : Ustrcmp(coded, sub[1]) == 0;
2938 else if (errno == EINVAL)
2939 tempcond = FALSE;
2940 else
2941 {
2942 expand_string_message = string_sprintf("crypt error: %s\n",
2943 US strerror(errno));
2944 return NULL;
2945 }
2946 }
2947 break;
2948 #endif /* SUPPORT_CRYPTEQ */
2949
2950 case ECOND_INLIST:
2951 case ECOND_INLISTI:
2952 {
2953 const uschar * list = sub[1];
2954 int sep = 0;
2955 uschar *save_iterate_item = iterate_item;
2956 int (*compare)(const uschar *, const uschar *);
2957
2958 DEBUG(D_expand) debug_printf_indent("condition: %s item: %s\n", name, sub[0]);
2959
2960 tempcond = FALSE;
2961 compare = cond_type == ECOND_INLISTI
2962 ? strcmpic : (int (*)(const uschar *, const uschar *)) strcmp;
2963
2964 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
2965 {
2966 DEBUG(D_expand) debug_printf_indent(" compare %s\n", iterate_item);
2967 if (compare(sub[0], iterate_item) == 0)
2968 {
2969 tempcond = TRUE;
2970 break;
2971 }
2972 }
2973 iterate_item = save_iterate_item;
2974 }
2975
2976 } /* Switch for comparison conditions */
2977
2978 *yield = tempcond == testfor;
2979 return s; /* End of comparison conditions */
2980
2981
2982 /* and/or: computes logical and/or of several conditions */
2983
2984 case ECOND_AND:
2985 case ECOND_OR:
2986 subcondptr = (yield == NULL)? NULL : &tempcond;
2987 combined_cond = (cond_type == ECOND_AND);
2988
2989 while (isspace(*s)) s++;
2990 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2991
2992 for (;;)
2993 {
2994 while (isspace(*s)) s++;
2995 /* {-for-text-editors */
2996 if (*s == '}') break;
2997 if (*s != '{') /* }-for-text-editors */
2998 {
2999 expand_string_message = string_sprintf("each subcondition "
3000 "inside an \"%s{...}\" condition must be in its own {}", name);
3001 return NULL;
3002 }
3003
3004 if (!(s = eval_condition(s+1, resetok, subcondptr)))
3005 {
3006 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
3007 expand_string_message, name);
3008 return NULL;
3009 }
3010 while (isspace(*s)) s++;
3011
3012 /* {-for-text-editors */
3013 if (*s++ != '}')
3014 {
3015 /* {-for-text-editors */
3016 expand_string_message = string_sprintf("missing } at end of condition "
3017 "inside \"%s\" group", name);
3018 return NULL;
3019 }
3020
3021 if (yield != NULL)
3022 {
3023 if (cond_type == ECOND_AND)
3024 {
3025 combined_cond &= tempcond;
3026 if (!combined_cond) subcondptr = NULL; /* once false, don't */
3027 } /* evaluate any more */
3028 else
3029 {
3030 combined_cond |= tempcond;
3031 if (combined_cond) subcondptr = NULL; /* once true, don't */
3032 } /* evaluate any more */
3033 }
3034 }
3035
3036 if (yield != NULL) *yield = (combined_cond == testfor);
3037 return ++s;
3038
3039
3040 /* forall/forany: iterates a condition with different values */
3041
3042 case ECOND_FORALL: is_forany = FALSE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3043 case ECOND_FORANY: is_forany = TRUE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3044 case ECOND_FORALL_JSON: is_forany = FALSE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3045 case ECOND_FORANY_JSON: is_forany = TRUE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3046 case ECOND_FORALL_JSONS: is_forany = FALSE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3047 case ECOND_FORANY_JSONS: is_forany = TRUE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3048
3049 FORMANY:
3050 {
3051 const uschar * list;
3052 int sep = 0;
3053 uschar *save_iterate_item = iterate_item;
3054
3055 DEBUG(D_expand) debug_printf_indent("condition: %s\n", name);
3056
3057 while (isspace(*s)) s++;
3058 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3059 sub[0] = expand_string_internal(s, TRUE, &s, (yield == NULL), TRUE, resetok);
3060 if (sub[0] == NULL) return NULL;
3061 /* {-for-text-editors */
3062 if (*s++ != '}') goto COND_FAILED_CURLY_END;
3063
3064 while (isspace(*s)) s++;
3065 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3066
3067 sub[1] = s;
3068
3069 /* Call eval_condition once, with result discarded (as if scanning a
3070 "false" part). This allows us to find the end of the condition, because if
3071 the list it empty, we won't actually evaluate the condition for real. */
3072
3073 if (!(s = eval_condition(sub[1], resetok, NULL)))
3074 {
3075 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3076 expand_string_message, name);
3077 return NULL;
3078 }
3079 while (isspace(*s)) s++;
3080
3081 /* {-for-text-editors */
3082 if (*s++ != '}')
3083 {
3084 /* {-for-text-editors */
3085 expand_string_message = string_sprintf("missing } at end of condition "
3086 "inside \"%s\"", name);
3087 return NULL;
3088 }
3089
3090 if (yield) *yield = !testfor;
3091 list = sub[0];
3092 if (is_json) list = dewrap(string_copy(list), US"[]");
3093 while ((iterate_item = is_json
3094 ? json_nextinlist(&list) : string_nextinlist(&list, &sep, NULL, 0)))
3095 {
3096 if (is_jsons)
3097 if (!(iterate_item = dewrap(iterate_item, US"\"\"")))
3098 {
3099 expand_string_message =
3100 string_sprintf("%s wrapping string result for extract jsons",
3101 expand_string_message);
3102 iterate_item = save_iterate_item;
3103 return NULL;
3104 }
3105
3106 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, iterate_item);
3107 if (!eval_condition(sub[1], resetok, &tempcond))
3108 {
3109 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3110 expand_string_message, name);
3111 iterate_item = save_iterate_item;
3112 return NULL;
3113 }
3114 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", name,
3115 tempcond? "true":"false");
3116
3117 if (yield) *yield = (tempcond == testfor);
3118 if (tempcond == is_forany) break;
3119 }
3120
3121 iterate_item = save_iterate_item;
3122 return s;
3123 }
3124
3125
3126 /* The bool{} expansion condition maps a string to boolean.
3127 The values supported should match those supported by the ACL condition
3128 (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas
3129 of true/false. Note that Router "condition" rules have a different
3130 interpretation, where general data can be used and only a few values
3131 map to FALSE.
3132 Note that readconf.c boolean matching, for boolean configuration options,
3133 only matches true/yes/false/no.
3134 The bool_lax{} condition matches the Router logic, which is much more
3135 liberal. */
3136 case ECOND_BOOL:
3137 case ECOND_BOOL_LAX:
3138 {
3139 uschar *sub_arg[1];
3140 uschar *t, *t2;
3141 uschar *ourname;
3142 size_t len;
3143 BOOL boolvalue = FALSE;
3144 while (isspace(*s)) s++;
3145 if (*s != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3146 ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
3147 switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname, resetok))
3148 {
3149 case 1: expand_string_message = string_sprintf(
3150 "too few arguments or bracketing error for %s",
3151 ourname);
3152 /*FALLTHROUGH*/
3153 case 2:
3154 case 3: return NULL;
3155 }
3156 t = sub_arg[0];
3157 while (isspace(*t)) t++;
3158 len = Ustrlen(t);
3159 if (len)
3160 {
3161 /* trailing whitespace: seems like a good idea to ignore it too */
3162 t2 = t + len - 1;
3163 while (isspace(*t2)) t2--;
3164 if (t2 != (t + len))
3165 {
3166 *++t2 = '\0';
3167 len = t2 - t;
3168 }
3169 }
3170 DEBUG(D_expand)
3171 debug_printf_indent("considering %s: %s\n", ourname, len ? t : US"<empty>");
3172 /* logic for the lax case from expand_check_condition(), which also does
3173 expands, and the logic is both short and stable enough that there should
3174 be no maintenance burden from replicating it. */
3175 if (len == 0)
3176 boolvalue = FALSE;
3177 else if (*t == '-'
3178 ? Ustrspn(t+1, "0123456789") == len-1
3179 : Ustrspn(t, "0123456789") == len)
3180 {
3181 boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
3182 /* expand_check_condition only does a literal string "0" check */
3183 if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
3184 boolvalue = TRUE;
3185 }
3186 else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
3187 boolvalue = TRUE;
3188 else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
3189 boolvalue = FALSE;
3190 else if (cond_type == ECOND_BOOL_LAX)
3191 boolvalue = TRUE;
3192 else
3193 {
3194 expand_string_message = string_sprintf("unrecognised boolean "
3195 "value \"%s\"", t);
3196 return NULL;
3197 }
3198 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", ourname,
3199 boolvalue? "true":"false");
3200 if (yield != NULL) *yield = (boolvalue == testfor);
3201 return s;
3202 }
3203
3204 /* Unknown condition */
3205
3206 default:
3207 expand_string_message = string_sprintf("unknown condition \"%s\"", name);
3208 return NULL;
3209 } /* End switch on condition type */
3210
3211 /* Missing braces at start and end of data */
3212
3213 COND_FAILED_CURLY_START:
3214 expand_string_message = string_sprintf("missing { after \"%s\"", name);
3215 return NULL;
3216
3217 COND_FAILED_CURLY_END:
3218 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
3219 name);
3220 return NULL;
3221
3222 /* A condition requires code that is not compiled */
3223
3224 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
3225 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
3226 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
3227 COND_FAILED_NOT_COMPILED:
3228 expand_string_message = string_sprintf("support for \"%s\" not compiled",
3229 name);
3230 return NULL;
3231 #endif
3232 }
3233
3234
3235
3236
3237 /*************************************************
3238 * Save numerical variables *
3239 *************************************************/
3240
3241 /* This function is called from items such as "if" that want to preserve and
3242 restore the numbered variables.
3243
3244 Arguments:
3245 save_expand_string points to an array of pointers to set
3246 save_expand_nlength points to an array of ints for the lengths
3247
3248 Returns: the value of expand max to save
3249 */
3250
3251 static int
3252 save_expand_strings(uschar **save_expand_nstring, int *save_expand_nlength)
3253 {
3254 for (int i = 0; i <= expand_nmax; i++)
3255 {
3256 save_expand_nstring[i] = expand_nstring[i];
3257 save_expand_nlength[i] = expand_nlength[i];
3258 }
3259 return expand_nmax;
3260 }
3261
3262
3263
3264 /*************************************************
3265 * Restore numerical variables *
3266 *************************************************/
3267
3268 /* This function restored saved values of numerical strings.
3269
3270 Arguments:
3271 save_expand_nmax the number of strings to restore
3272 save_expand_string points to an array of pointers
3273 save_expand_nlength points to an array of ints
3274
3275 Returns: nothing
3276 */
3277
3278 static void
3279 restore_expand_strings(int save_expand_nmax, uschar **save_expand_nstring,
3280 int *save_expand_nlength)
3281 {
3282 expand_nmax = save_expand_nmax;
3283 for (int i = 0; i <= expand_nmax; i++)
3284 {
3285 expand_nstring[i] = save_expand_nstring[i];
3286 expand_nlength[i] = save_expand_nlength[i];
3287 }
3288 }
3289
3290
3291
3292
3293
3294 /*************************************************
3295 * Handle yes/no substrings *
3296 *************************************************/
3297
3298 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
3299 alternative substrings that depend on whether or not the condition was true,
3300 or the lookup or extraction succeeded. The substrings always have to be
3301 expanded, to check their syntax, but "skipping" is set when the result is not
3302 needed - this avoids unnecessary nested lookups.
3303
3304 Arguments:
3305 skipping TRUE if we were skipping when this item was reached
3306 yes TRUE if the first string is to be used, else use the second
3307 save_lookup a value to put back into lookup_value before the 2nd expansion
3308 sptr points to the input string pointer
3309 yieldptr points to the output growable-string pointer
3310 type "lookup", "if", "extract", "run", "env", "listextract" or
3311 "certextract" for error message
3312 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
3313 the store.
3314
3315 Returns: 0 OK; lookup_value has been reset to save_lookup
3316 1 expansion failed
3317 2 expansion failed because of bracketing error
3318 */
3319
3320 static int
3321 process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, const uschar **sptr,
3322 gstring ** yieldptr, uschar *type, BOOL *resetok)
3323 {
3324 int rc = 0;
3325 const uschar *s = *sptr; /* Local value */
3326 uschar *sub1, *sub2;
3327 const uschar * errwhere;
3328
3329 /* If there are no following strings, we substitute the contents of $value for
3330 lookups and for extractions in the success case. For the ${if item, the string
3331 "true" is substituted. In the fail case, nothing is substituted for all three
3332 items. */
3333
3334 while (isspace(*s)) s++;
3335 if (*s == '}')
3336 {
3337 if (type[0] == 'i')
3338 {
3339 if (yes && !skipping)
3340 *yieldptr = string_catn(*yieldptr, US"true", 4);
3341 }
3342 else
3343 {
3344 if (yes && lookup_value && !skipping)
3345 *yieldptr = string_cat(*yieldptr, lookup_value);
3346 lookup_value = save_lookup;
3347 }
3348 s++;
3349 goto RETURN;
3350 }
3351
3352 /* The first following string must be braced. */
3353
3354 if (*s++ != '{')
3355 {
3356 errwhere = US"'yes' part did not start with '{'";
3357 goto FAILED_CURLY;
3358 }