ARC: add $arc_oldest_pass variable, for verify
[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"forany",
316 US"ge",
317 US"gei",
318 US"gt",
319 US"gti",
320 US"inlist",
321 US"inlisti",
322 US"isip",
323 US"isip4",
324 US"isip6",
325 US"ldapauth",
326 US"le",
327 US"lei",
328 US"lt",
329 US"lti",
330 US"match",
331 US"match_address",
332 US"match_domain",
333 US"match_ip",
334 US"match_local_part",
335 US"or",
336 US"pam",
337 US"pwcheck",
338 US"queue_running",
339 US"radius",
340 US"saslauthd"
341 };
342
343 enum {
344 ECOND_NUM_L,
345 ECOND_NUM_LE,
346 ECOND_NUM_E,
347 ECOND_NUM_EE,
348 ECOND_NUM_G,
349 ECOND_NUM_GE,
350 ECOND_ACL,
351 ECOND_AND,
352 ECOND_BOOL,
353 ECOND_BOOL_LAX,
354 ECOND_CRYPTEQ,
355 ECOND_DEF,
356 ECOND_STR_EQ,
357 ECOND_STR_EQI,
358 ECOND_EXISTS,
359 ECOND_FIRST_DELIVERY,
360 ECOND_FORALL,
361 ECOND_FORANY,
362 ECOND_STR_GE,
363 ECOND_STR_GEI,
364 ECOND_STR_GT,
365 ECOND_STR_GTI,
366 ECOND_INLIST,
367 ECOND_INLISTI,
368 ECOND_ISIP,
369 ECOND_ISIP4,
370 ECOND_ISIP6,
371 ECOND_LDAPAUTH,
372 ECOND_STR_LE,
373 ECOND_STR_LEI,
374 ECOND_STR_LT,
375 ECOND_STR_LTI,
376 ECOND_MATCH,
377 ECOND_MATCH_ADDRESS,
378 ECOND_MATCH_DOMAIN,
379 ECOND_MATCH_IP,
380 ECOND_MATCH_LOCAL_PART,
381 ECOND_OR,
382 ECOND_PAM,
383 ECOND_PWCHECK,
384 ECOND_QUEUE_RUNNING,
385 ECOND_RADIUS,
386 ECOND_SASLAUTHD
387 };
388
389
390 /* Types of table entry */
391
392 enum vtypes {
393 vtype_int, /* value is address of int */
394 vtype_filter_int, /* ditto, but recognized only when filtering */
395 vtype_ino, /* value is address of ino_t (not always an int) */
396 vtype_uid, /* value is address of uid_t (not always an int) */
397 vtype_gid, /* value is address of gid_t (not always an int) */
398 vtype_bool, /* value is address of bool */
399 vtype_stringptr, /* value is address of pointer to string */
400 vtype_msgbody, /* as stringptr, but read when first required */
401 vtype_msgbody_end, /* ditto, the end of the message */
402 vtype_msgheaders, /* the message's headers, processed */
403 vtype_msgheaders_raw, /* the message's headers, unprocessed */
404 vtype_localpart, /* extract local part from string */
405 vtype_domain, /* extract domain from string */
406 vtype_string_func, /* value is string returned by given function */
407 vtype_todbsdin, /* value not used; generate BSD inbox tod */
408 vtype_tode, /* value not used; generate tod in epoch format */
409 vtype_todel, /* value not used; generate tod in epoch/usec format */
410 vtype_todf, /* value not used; generate full tod */
411 vtype_todl, /* value not used; generate log tod */
412 vtype_todlf, /* value not used; generate log file datestamp tod */
413 vtype_todzone, /* value not used; generate time zone only */
414 vtype_todzulu, /* value not used; generate zulu tod */
415 vtype_reply, /* value not used; get reply from headers */
416 vtype_pid, /* value not used; result is pid */
417 vtype_host_lookup, /* value not used; get host name */
418 vtype_load_avg, /* value not used; result is int from os_getloadavg */
419 vtype_pspace, /* partition space; value is T/F for spool/log */
420 vtype_pinodes, /* partition inodes; value is T/F for spool/log */
421 vtype_cert /* SSL certificate */
422 #ifndef DISABLE_DKIM
423 ,vtype_dkim /* Lookup of value in DKIM signature */
424 #endif
425 };
426
427 /* Type for main variable table */
428
429 typedef struct {
430 const char *name;
431 enum vtypes type;
432 void *value;
433 } var_entry;
434
435 /* Type for entries pointing to address/length pairs. Not currently
436 in use. */
437
438 typedef struct {
439 uschar **address;
440 int *length;
441 } alblock;
442
443 static uschar * fn_recipients(void);
444
445 /* This table must be kept in alphabetical order. */
446
447 static var_entry var_table[] = {
448 /* WARNING: Do not invent variables whose names start acl_c or acl_m because
449 they will be confused with user-creatable ACL variables. */
450 { "acl_arg1", vtype_stringptr, &acl_arg[0] },
451 { "acl_arg2", vtype_stringptr, &acl_arg[1] },
452 { "acl_arg3", vtype_stringptr, &acl_arg[2] },
453 { "acl_arg4", vtype_stringptr, &acl_arg[3] },
454 { "acl_arg5", vtype_stringptr, &acl_arg[4] },
455 { "acl_arg6", vtype_stringptr, &acl_arg[5] },
456 { "acl_arg7", vtype_stringptr, &acl_arg[6] },
457 { "acl_arg8", vtype_stringptr, &acl_arg[7] },
458 { "acl_arg9", vtype_stringptr, &acl_arg[8] },
459 { "acl_narg", vtype_int, &acl_narg },
460 { "acl_verify_message", vtype_stringptr, &acl_verify_message },
461 { "address_data", vtype_stringptr, &deliver_address_data },
462 { "address_file", vtype_stringptr, &address_file },
463 { "address_pipe", vtype_stringptr, &address_pipe },
464 #ifdef EXPERIMENTAL_ARC
465 { "arc_domains", vtype_string_func, &fn_arc_domains },
466 { "arc_oldest_pass", vtype_int, &arc_oldest_pass },
467 { "arc_state", vtype_stringptr, &arc_state },
468 { "arc_state_reason", vtype_stringptr, &arc_state_reason },
469 #endif
470 { "authenticated_fail_id",vtype_stringptr, &authenticated_fail_id },
471 { "authenticated_id", vtype_stringptr, &authenticated_id },
472 { "authenticated_sender",vtype_stringptr, &authenticated_sender },
473 { "authentication_failed",vtype_int, &authentication_failed },
474 #ifdef WITH_CONTENT_SCAN
475 { "av_failed", vtype_int, &av_failed },
476 #endif
477 #ifdef EXPERIMENTAL_BRIGHTMAIL
478 { "bmi_alt_location", vtype_stringptr, &bmi_alt_location },
479 { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict },
480 { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict },
481 { "bmi_deliver", vtype_int, &bmi_deliver },
482 #endif
483 { "body_linecount", vtype_int, &body_linecount },
484 { "body_zerocount", vtype_int, &body_zerocount },
485 { "bounce_recipient", vtype_stringptr, &bounce_recipient },
486 { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit },
487 { "caller_gid", vtype_gid, &real_gid },
488 { "caller_uid", vtype_uid, &real_uid },
489 { "callout_address", vtype_stringptr, &callout_address },
490 { "compile_date", vtype_stringptr, &version_date },
491 { "compile_number", vtype_stringptr, &version_cnumber },
492 { "config_dir", vtype_stringptr, &config_main_directory },
493 { "config_file", vtype_stringptr, &config_main_filename },
494 { "csa_status", vtype_stringptr, &csa_status },
495 #ifdef EXPERIMENTAL_DCC
496 { "dcc_header", vtype_stringptr, &dcc_header },
497 { "dcc_result", vtype_stringptr, &dcc_result },
498 #endif
499 #ifndef DISABLE_DKIM
500 { "dkim_algo", vtype_dkim, (void *)DKIM_ALGO },
501 { "dkim_bodylength", vtype_dkim, (void *)DKIM_BODYLENGTH },
502 { "dkim_canon_body", vtype_dkim, (void *)DKIM_CANON_BODY },
503 { "dkim_canon_headers", vtype_dkim, (void *)DKIM_CANON_HEADERS },
504 { "dkim_copiedheaders", vtype_dkim, (void *)DKIM_COPIEDHEADERS },
505 { "dkim_created", vtype_dkim, (void *)DKIM_CREATED },
506 { "dkim_cur_signer", vtype_stringptr, &dkim_cur_signer },
507 { "dkim_domain", vtype_stringptr, &dkim_signing_domain },
508 { "dkim_expires", vtype_dkim, (void *)DKIM_EXPIRES },
509 { "dkim_headernames", vtype_dkim, (void *)DKIM_HEADERNAMES },
510 { "dkim_identity", vtype_dkim, (void *)DKIM_IDENTITY },
511 { "dkim_key_granularity",vtype_dkim, (void *)DKIM_KEY_GRANULARITY },
512 { "dkim_key_length", vtype_int, &dkim_key_length },
513 { "dkim_key_nosubdomains",vtype_dkim, (void *)DKIM_NOSUBDOMAINS },
514 { "dkim_key_notes", vtype_dkim, (void *)DKIM_KEY_NOTES },
515 { "dkim_key_srvtype", vtype_dkim, (void *)DKIM_KEY_SRVTYPE },
516 { "dkim_key_testing", vtype_dkim, (void *)DKIM_KEY_TESTING },
517 { "dkim_selector", vtype_stringptr, &dkim_signing_selector },
518 { "dkim_signers", vtype_stringptr, &dkim_signers },
519 { "dkim_verify_reason", vtype_stringptr, &dkim_verify_reason },
520 { "dkim_verify_status", vtype_stringptr, &dkim_verify_status },
521 #endif
522 #ifdef EXPERIMENTAL_DMARC
523 { "dmarc_domain_policy", vtype_stringptr, &dmarc_domain_policy },
524 { "dmarc_status", vtype_stringptr, &dmarc_status },
525 { "dmarc_status_text", vtype_stringptr, &dmarc_status_text },
526 { "dmarc_used_domain", vtype_stringptr, &dmarc_used_domain },
527 #endif
528 { "dnslist_domain", vtype_stringptr, &dnslist_domain },
529 { "dnslist_matched", vtype_stringptr, &dnslist_matched },
530 { "dnslist_text", vtype_stringptr, &dnslist_text },
531 { "dnslist_value", vtype_stringptr, &dnslist_value },
532 { "domain", vtype_stringptr, &deliver_domain },
533 { "domain_data", vtype_stringptr, &deliver_domain_data },
534 #ifndef DISABLE_EVENT
535 { "event_data", vtype_stringptr, &event_data },
536
537 /*XXX want to use generic vars for as many of these as possible*/
538 { "event_defer_errno", vtype_int, &event_defer_errno },
539
540 { "event_name", vtype_stringptr, &event_name },
541 #endif
542 { "exim_gid", vtype_gid, &exim_gid },
543 { "exim_path", vtype_stringptr, &exim_path },
544 { "exim_uid", vtype_uid, &exim_uid },
545 { "exim_version", vtype_stringptr, &version_string },
546 { "headers_added", vtype_string_func, &fn_hdrs_added },
547 { "home", vtype_stringptr, &deliver_home },
548 { "host", vtype_stringptr, &deliver_host },
549 { "host_address", vtype_stringptr, &deliver_host_address },
550 { "host_data", vtype_stringptr, &host_data },
551 { "host_lookup_deferred",vtype_int, &host_lookup_deferred },
552 { "host_lookup_failed", vtype_int, &host_lookup_failed },
553 { "host_port", vtype_int, &deliver_host_port },
554 { "initial_cwd", vtype_stringptr, &initial_cwd },
555 { "inode", vtype_ino, &deliver_inode },
556 { "interface_address", vtype_stringptr, &interface_address },
557 { "interface_port", vtype_int, &interface_port },
558 { "item", vtype_stringptr, &iterate_item },
559 #ifdef LOOKUP_LDAP
560 { "ldap_dn", vtype_stringptr, &eldap_dn },
561 #endif
562 { "load_average", vtype_load_avg, NULL },
563 { "local_part", vtype_stringptr, &deliver_localpart },
564 { "local_part_data", vtype_stringptr, &deliver_localpart_data },
565 { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix },
566 { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix },
567 #ifdef HAVE_LOCAL_SCAN
568 { "local_scan_data", vtype_stringptr, &local_scan_data },
569 #endif
570 { "local_user_gid", vtype_gid, &local_user_gid },
571 { "local_user_uid", vtype_uid, &local_user_uid },
572 { "localhost_number", vtype_int, &host_number },
573 { "log_inodes", vtype_pinodes, (void *)FALSE },
574 { "log_space", vtype_pspace, (void *)FALSE },
575 { "lookup_dnssec_authenticated",vtype_stringptr,&lookup_dnssec_authenticated},
576 { "mailstore_basename", vtype_stringptr, &mailstore_basename },
577 #ifdef WITH_CONTENT_SCAN
578 { "malware_name", vtype_stringptr, &malware_name },
579 #endif
580 { "max_received_linelength", vtype_int, &max_received_linelength },
581 { "message_age", vtype_int, &message_age },
582 { "message_body", vtype_msgbody, &message_body },
583 { "message_body_end", vtype_msgbody_end, &message_body_end },
584 { "message_body_size", vtype_int, &message_body_size },
585 { "message_exim_id", vtype_stringptr, &message_id },
586 { "message_headers", vtype_msgheaders, NULL },
587 { "message_headers_raw", vtype_msgheaders_raw, NULL },
588 { "message_id", vtype_stringptr, &message_id },
589 { "message_linecount", vtype_int, &message_linecount },
590 { "message_size", vtype_int, &message_size },
591 #ifdef SUPPORT_I18N
592 { "message_smtputf8", vtype_bool, &message_smtputf8 },
593 #endif
594 #ifdef WITH_CONTENT_SCAN
595 { "mime_anomaly_level", vtype_int, &mime_anomaly_level },
596 { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text },
597 { "mime_boundary", vtype_stringptr, &mime_boundary },
598 { "mime_charset", vtype_stringptr, &mime_charset },
599 { "mime_content_description", vtype_stringptr, &mime_content_description },
600 { "mime_content_disposition", vtype_stringptr, &mime_content_disposition },
601 { "mime_content_id", vtype_stringptr, &mime_content_id },
602 { "mime_content_size", vtype_int, &mime_content_size },
603 { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding },
604 { "mime_content_type", vtype_stringptr, &mime_content_type },
605 { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename },
606 { "mime_filename", vtype_stringptr, &mime_filename },
607 { "mime_is_coverletter", vtype_int, &mime_is_coverletter },
608 { "mime_is_multipart", vtype_int, &mime_is_multipart },
609 { "mime_is_rfc822", vtype_int, &mime_is_rfc822 },
610 { "mime_part_count", vtype_int, &mime_part_count },
611 #endif
612 { "n0", vtype_filter_int, &filter_n[0] },
613 { "n1", vtype_filter_int, &filter_n[1] },
614 { "n2", vtype_filter_int, &filter_n[2] },
615 { "n3", vtype_filter_int, &filter_n[3] },
616 { "n4", vtype_filter_int, &filter_n[4] },
617 { "n5", vtype_filter_int, &filter_n[5] },
618 { "n6", vtype_filter_int, &filter_n[6] },
619 { "n7", vtype_filter_int, &filter_n[7] },
620 { "n8", vtype_filter_int, &filter_n[8] },
621 { "n9", vtype_filter_int, &filter_n[9] },
622 { "original_domain", vtype_stringptr, &deliver_domain_orig },
623 { "original_local_part", vtype_stringptr, &deliver_localpart_orig },
624 { "originator_gid", vtype_gid, &originator_gid },
625 { "originator_uid", vtype_uid, &originator_uid },
626 { "parent_domain", vtype_stringptr, &deliver_domain_parent },
627 { "parent_local_part", vtype_stringptr, &deliver_localpart_parent },
628 { "pid", vtype_pid, NULL },
629 #ifndef DISABLE_PRDR
630 { "prdr_requested", vtype_bool, &prdr_requested },
631 #endif
632 { "primary_hostname", vtype_stringptr, &primary_hostname },
633 #if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS)
634 { "proxy_external_address",vtype_stringptr, &proxy_external_address },
635 { "proxy_external_port", vtype_int, &proxy_external_port },
636 { "proxy_local_address", vtype_stringptr, &proxy_local_address },
637 { "proxy_local_port", vtype_int, &proxy_local_port },
638 { "proxy_session", vtype_bool, &proxy_session },
639 #endif
640 { "prvscheck_address", vtype_stringptr, &prvscheck_address },
641 { "prvscheck_keynum", vtype_stringptr, &prvscheck_keynum },
642 { "prvscheck_result", vtype_stringptr, &prvscheck_result },
643 { "qualify_domain", vtype_stringptr, &qualify_domain_sender },
644 { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient },
645 { "queue_name", vtype_stringptr, &queue_name },
646 { "rcpt_count", vtype_int, &rcpt_count },
647 { "rcpt_defer_count", vtype_int, &rcpt_defer_count },
648 { "rcpt_fail_count", vtype_int, &rcpt_fail_count },
649 { "received_count", vtype_int, &received_count },
650 { "received_for", vtype_stringptr, &received_for },
651 { "received_ip_address", vtype_stringptr, &interface_address },
652 { "received_port", vtype_int, &interface_port },
653 { "received_protocol", vtype_stringptr, &received_protocol },
654 { "received_time", vtype_int, &received_time.tv_sec },
655 { "recipient_data", vtype_stringptr, &recipient_data },
656 { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure },
657 { "recipients", vtype_string_func, &fn_recipients },
658 { "recipients_count", vtype_int, &recipients_count },
659 #ifdef WITH_CONTENT_SCAN
660 { "regex_match_string", vtype_stringptr, &regex_match_string },
661 #endif
662 { "reply_address", vtype_reply, NULL },
663 { "return_path", vtype_stringptr, &return_path },
664 { "return_size_limit", vtype_int, &bounce_return_size_limit },
665 { "router_name", vtype_stringptr, &router_name },
666 { "runrc", vtype_int, &runrc },
667 { "self_hostname", vtype_stringptr, &self_hostname },
668 { "sender_address", vtype_stringptr, &sender_address },
669 { "sender_address_data", vtype_stringptr, &sender_address_data },
670 { "sender_address_domain", vtype_domain, &sender_address },
671 { "sender_address_local_part", vtype_localpart, &sender_address },
672 { "sender_data", vtype_stringptr, &sender_data },
673 { "sender_fullhost", vtype_stringptr, &sender_fullhost },
674 { "sender_helo_dnssec", vtype_bool, &sender_helo_dnssec },
675 { "sender_helo_name", vtype_stringptr, &sender_helo_name },
676 { "sender_host_address", vtype_stringptr, &sender_host_address },
677 { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated },
678 { "sender_host_dnssec", vtype_bool, &sender_host_dnssec },
679 { "sender_host_name", vtype_host_lookup, NULL },
680 { "sender_host_port", vtype_int, &sender_host_port },
681 { "sender_ident", vtype_stringptr, &sender_ident },
682 { "sender_rate", vtype_stringptr, &sender_rate },
683 { "sender_rate_limit", vtype_stringptr, &sender_rate_limit },
684 { "sender_rate_period", vtype_stringptr, &sender_rate_period },
685 { "sender_rcvhost", vtype_stringptr, &sender_rcvhost },
686 { "sender_verify_failure",vtype_stringptr, &sender_verify_failure },
687 { "sending_ip_address", vtype_stringptr, &sending_ip_address },
688 { "sending_port", vtype_int, &sending_port },
689 { "smtp_active_hostname", vtype_stringptr, &smtp_active_hostname },
690 { "smtp_command", vtype_stringptr, &smtp_cmd_buffer },
691 { "smtp_command_argument", vtype_stringptr, &smtp_cmd_argument },
692 { "smtp_command_history", vtype_string_func, &smtp_cmd_hist },
693 { "smtp_count_at_connection_start", vtype_int, &smtp_accept_count },
694 { "smtp_notquit_reason", vtype_stringptr, &smtp_notquit_reason },
695 { "sn0", vtype_filter_int, &filter_sn[0] },
696 { "sn1", vtype_filter_int, &filter_sn[1] },
697 { "sn2", vtype_filter_int, &filter_sn[2] },
698 { "sn3", vtype_filter_int, &filter_sn[3] },
699 { "sn4", vtype_filter_int, &filter_sn[4] },
700 { "sn5", vtype_filter_int, &filter_sn[5] },
701 { "sn6", vtype_filter_int, &filter_sn[6] },
702 { "sn7", vtype_filter_int, &filter_sn[7] },
703 { "sn8", vtype_filter_int, &filter_sn[8] },
704 { "sn9", vtype_filter_int, &filter_sn[9] },
705 #ifdef WITH_CONTENT_SCAN
706 { "spam_action", vtype_stringptr, &spam_action },
707 { "spam_bar", vtype_stringptr, &spam_bar },
708 { "spam_report", vtype_stringptr, &spam_report },
709 { "spam_score", vtype_stringptr, &spam_score },
710 { "spam_score_int", vtype_stringptr, &spam_score_int },
711 #endif
712 #ifdef SUPPORT_SPF
713 { "spf_guess", vtype_stringptr, &spf_guess },
714 { "spf_header_comment", vtype_stringptr, &spf_header_comment },
715 { "spf_received", vtype_stringptr, &spf_received },
716 { "spf_result", vtype_stringptr, &spf_result },
717 { "spf_result_guessed", vtype_bool, &spf_result_guessed },
718 { "spf_smtp_comment", vtype_stringptr, &spf_smtp_comment },
719 #endif
720 { "spool_directory", vtype_stringptr, &spool_directory },
721 { "spool_inodes", vtype_pinodes, (void *)TRUE },
722 { "spool_space", vtype_pspace, (void *)TRUE },
723 #ifdef EXPERIMENTAL_SRS
724 { "srs_db_address", vtype_stringptr, &srs_db_address },
725 { "srs_db_key", vtype_stringptr, &srs_db_key },
726 { "srs_orig_recipient", vtype_stringptr, &srs_orig_recipient },
727 { "srs_orig_sender", vtype_stringptr, &srs_orig_sender },
728 { "srs_recipient", vtype_stringptr, &srs_recipient },
729 { "srs_status", vtype_stringptr, &srs_status },
730 #endif
731 { "thisaddress", vtype_stringptr, &filter_thisaddress },
732
733 /* The non-(in,out) variables are now deprecated */
734 { "tls_bits", vtype_int, &tls_in.bits },
735 { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified },
736 { "tls_cipher", vtype_stringptr, &tls_in.cipher },
737
738 { "tls_in_bits", vtype_int, &tls_in.bits },
739 { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified },
740 { "tls_in_cipher", vtype_stringptr, &tls_in.cipher },
741 { "tls_in_ocsp", vtype_int, &tls_in.ocsp },
742 { "tls_in_ourcert", vtype_cert, &tls_in.ourcert },
743 { "tls_in_peercert", vtype_cert, &tls_in.peercert },
744 { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn },
745 #if defined(SUPPORT_TLS)
746 { "tls_in_sni", vtype_stringptr, &tls_in.sni },
747 #endif
748 { "tls_out_bits", vtype_int, &tls_out.bits },
749 { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified },
750 { "tls_out_cipher", vtype_stringptr, &tls_out.cipher },
751 #ifdef SUPPORT_DANE
752 { "tls_out_dane", vtype_bool, &tls_out.dane_verified },
753 #endif
754 { "tls_out_ocsp", vtype_int, &tls_out.ocsp },
755 { "tls_out_ourcert", vtype_cert, &tls_out.ourcert },
756 { "tls_out_peercert", vtype_cert, &tls_out.peercert },
757 { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn },
758 #if defined(SUPPORT_TLS)
759 { "tls_out_sni", vtype_stringptr, &tls_out.sni },
760 #endif
761 #ifdef SUPPORT_DANE
762 { "tls_out_tlsa_usage", vtype_int, &tls_out.tlsa_usage },
763 #endif
764
765 { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */
766 #if defined(SUPPORT_TLS)
767 { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */
768 #endif
769
770 { "tod_bsdinbox", vtype_todbsdin, NULL },
771 { "tod_epoch", vtype_tode, NULL },
772 { "tod_epoch_l", vtype_todel, NULL },
773 { "tod_full", vtype_todf, NULL },
774 { "tod_log", vtype_todl, NULL },
775 { "tod_logfile", vtype_todlf, NULL },
776 { "tod_zone", vtype_todzone, NULL },
777 { "tod_zulu", vtype_todzulu, NULL },
778 { "transport_name", vtype_stringptr, &transport_name },
779 { "value", vtype_stringptr, &lookup_value },
780 { "verify_mode", vtype_stringptr, &verify_mode },
781 { "version_number", vtype_stringptr, &version_string },
782 { "warn_message_delay", vtype_stringptr, &warnmsg_delay },
783 { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients },
784 { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients },
785 { "warnmsg_delay", vtype_stringptr, &warnmsg_delay },
786 { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients },
787 { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients }
788 };
789
790 static int var_table_size = nelem(var_table);
791 static uschar var_buffer[256];
792 static BOOL malformed_header;
793
794 /* For textual hashes */
795
796 static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz"
797 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
798 "0123456789";
799
800 enum { HMAC_MD5, HMAC_SHA1 };
801
802 /* For numeric hashes */
803
804 static unsigned int prime[] = {
805 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
806 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
807 73, 79, 83, 89, 97, 101, 103, 107, 109, 113};
808
809 /* For printing modes in symbolic form */
810
811 static uschar *mtable_normal[] =
812 { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" };
813
814 static uschar *mtable_setid[] =
815 { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" };
816
817 static uschar *mtable_sticky[] =
818 { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" };
819
820
821
822 /*************************************************
823 * Tables for UTF-8 support *
824 *************************************************/
825
826 /* Table of the number of extra characters, indexed by the first character
827 masked with 0x3f. The highest number for a valid UTF-8 character is in fact
828 0x3d. */
829
830 static uschar utf8_table1[] = {
831 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
832 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
833 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
834 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
835
836 /* These are the masks for the data bits in the first byte of a character,
837 indexed by the number of additional bytes. */
838
839 static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
840
841 /* Get the next UTF-8 character, advancing the pointer. */
842
843 #define GETUTF8INC(c, ptr) \
844 c = *ptr++; \
845 if ((c & 0xc0) == 0xc0) \
846 { \
847 int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \
848 int s = 6*a; \
849 c = (c & utf8_table2[a]) << s; \
850 while (a-- > 0) \
851 { \
852 s -= 6; \
853 c |= (*ptr++ & 0x3f) << s; \
854 } \
855 }
856
857
858
859 static uschar * base32_chars = US"abcdefghijklmnopqrstuvwxyz234567";
860
861 /*************************************************
862 * Binary chop search on a table *
863 *************************************************/
864
865 /* This is used for matching expansion items and operators.
866
867 Arguments:
868 name the name that is being sought
869 table the table to search
870 table_size the number of items in the table
871
872 Returns: the offset in the table, or -1
873 */
874
875 static int
876 chop_match(uschar *name, uschar **table, int table_size)
877 {
878 uschar **bot = table;
879 uschar **top = table + table_size;
880
881 while (top > bot)
882 {
883 uschar **mid = bot + (top - bot)/2;
884 int c = Ustrcmp(name, *mid);
885 if (c == 0) return mid - table;
886 if (c > 0) bot = mid + 1; else top = mid;
887 }
888
889 return -1;
890 }
891
892
893
894 /*************************************************
895 * Check a condition string *
896 *************************************************/
897
898 /* This function is called to expand a string, and test the result for a "true"
899 or "false" value. Failure of the expansion yields FALSE; logged unless it was a
900 forced fail or lookup defer.
901
902 We used to release all store used, but this is not not safe due
903 to ${dlfunc } and ${acl }. In any case expand_string_internal()
904 is reasonably careful to release what it can.
905
906 The actual false-value tests should be replicated for ECOND_BOOL_LAX.
907
908 Arguments:
909 condition the condition string
910 m1 text to be incorporated in panic error
911 m2 ditto
912
913 Returns: TRUE if condition is met, FALSE if not
914 */
915
916 BOOL
917 expand_check_condition(uschar *condition, uschar *m1, uschar *m2)
918 {
919 int rc;
920 uschar *ss = expand_string(condition);
921 if (ss == NULL)
922 {
923 if (!expand_string_forcedfail && !search_find_defer)
924 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" "
925 "for %s %s: %s", condition, m1, m2, expand_string_message);
926 return FALSE;
927 }
928 rc = ss[0] != 0 && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 &&
929 strcmpic(ss, US"false") != 0;
930 return rc;
931 }
932
933
934
935
936 /*************************************************
937 * Pseudo-random number generation *
938 *************************************************/
939
940 /* Pseudo-random number generation. The result is not "expected" to be
941 cryptographically strong but not so weak that someone will shoot themselves
942 in the foot using it as a nonce in some email header scheme or whatever
943 weirdness they'll twist this into. The result should ideally handle fork().
944
945 However, if we're stuck unable to provide this, then we'll fall back to
946 appallingly bad randomness.
947
948 If SUPPORT_TLS is defined then this will not be used except as an emergency
949 fallback.
950
951 Arguments:
952 max range maximum
953 Returns a random number in range [0, max-1]
954 */
955
956 #ifdef SUPPORT_TLS
957 # define vaguely_random_number vaguely_random_number_fallback
958 #endif
959 int
960 vaguely_random_number(int max)
961 {
962 #ifdef SUPPORT_TLS
963 # undef vaguely_random_number
964 #endif
965 static pid_t pid = 0;
966 pid_t p2;
967 #if defined(HAVE_SRANDOM) && !defined(HAVE_SRANDOMDEV)
968 struct timeval tv;
969 #endif
970
971 p2 = getpid();
972 if (p2 != pid)
973 {
974 if (pid != 0)
975 {
976
977 #ifdef HAVE_ARC4RANDOM
978 /* cryptographically strong randomness, common on *BSD platforms, not
979 so much elsewhere. Alas. */
980 #ifndef NOT_HAVE_ARC4RANDOM_STIR
981 arc4random_stir();
982 #endif
983 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
984 #ifdef HAVE_SRANDOMDEV
985 /* uses random(4) for seeding */
986 srandomdev();
987 #else
988 gettimeofday(&tv, NULL);
989 srandom(tv.tv_sec | tv.tv_usec | getpid());
990 #endif
991 #else
992 /* Poor randomness and no seeding here */
993 #endif
994
995 }
996 pid = p2;
997 }
998
999 #ifdef HAVE_ARC4RANDOM
1000 return arc4random() % max;
1001 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1002 return random() % max;
1003 #else
1004 /* This one returns a 16-bit number, definitely not crypto-strong */
1005 return random_number(max);
1006 #endif
1007 }
1008
1009
1010
1011
1012 /*************************************************
1013 * Pick out a name from a string *
1014 *************************************************/
1015
1016 /* If the name is too long, it is silently truncated.
1017
1018 Arguments:
1019 name points to a buffer into which to put the name
1020 max is the length of the buffer
1021 s points to the first alphabetic character of the name
1022 extras chars other than alphanumerics to permit
1023
1024 Returns: pointer to the first character after the name
1025
1026 Note: The test for *s != 0 in the while loop is necessary because
1027 Ustrchr() yields non-NULL if the character is zero (which is not something
1028 I expected). */
1029
1030 static const uschar *
1031 read_name(uschar *name, int max, const uschar *s, uschar *extras)
1032 {
1033 int ptr = 0;
1034 while (*s != 0 && (isalnum(*s) || Ustrchr(extras, *s) != NULL))
1035 {
1036 if (ptr < max-1) name[ptr++] = *s;
1037 s++;
1038 }
1039 name[ptr] = 0;
1040 return s;
1041 }
1042
1043
1044
1045 /*************************************************
1046 * Pick out the rest of a header name *
1047 *************************************************/
1048
1049 /* A variable name starting $header_ (or just $h_ for those who like
1050 abbreviations) might not be the complete header name because headers can
1051 contain any printing characters in their names, except ':'. This function is
1052 called to read the rest of the name, chop h[eader]_ off the front, and put ':'
1053 on the end, if the name was terminated by white space.
1054
1055 Arguments:
1056 name points to a buffer in which the name read so far exists
1057 max is the length of the buffer
1058 s points to the first character after the name so far, i.e. the
1059 first non-alphameric character after $header_xxxxx
1060
1061 Returns: a pointer to the first character after the header name
1062 */
1063
1064 static const uschar *
1065 read_header_name(uschar *name, int max, const uschar *s)
1066 {
1067 int prelen = Ustrchr(name, '_') - name + 1;
1068 int ptr = Ustrlen(name) - prelen;
1069 if (ptr > 0) memmove(name, name+prelen, ptr);
1070 while (mac_isgraph(*s) && *s != ':')
1071 {
1072 if (ptr < max-1) name[ptr++] = *s;
1073 s++;
1074 }
1075 if (*s == ':') s++;
1076 name[ptr++] = ':';
1077 name[ptr] = 0;
1078 return s;
1079 }
1080
1081
1082
1083 /*************************************************
1084 * Pick out a number from a string *
1085 *************************************************/
1086
1087 /* Arguments:
1088 n points to an integer into which to put the number
1089 s points to the first digit of the number
1090
1091 Returns: a pointer to the character after the last digit
1092 */
1093 /*XXX consider expanding to int_eximarith_t. But the test for
1094 "overbig numbers" in 0002 still needs to overflow it. */
1095
1096 static uschar *
1097 read_number(int *n, uschar *s)
1098 {
1099 *n = 0;
1100 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1101 return s;
1102 }
1103
1104 static const uschar *
1105 read_cnumber(int *n, const uschar *s)
1106 {
1107 *n = 0;
1108 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1109 return s;
1110 }
1111
1112
1113
1114 /*************************************************
1115 * Extract keyed subfield from a string *
1116 *************************************************/
1117
1118 /* The yield is in dynamic store; NULL means that the key was not found.
1119
1120 Arguments:
1121 key points to the name of the key
1122 s points to the string from which to extract the subfield
1123
1124 Returns: NULL if the subfield was not found, or
1125 a pointer to the subfield's data
1126 */
1127
1128 static uschar *
1129 expand_getkeyed(uschar *key, const uschar *s)
1130 {
1131 int length = Ustrlen(key);
1132 while (isspace(*s)) s++;
1133
1134 /* Loop to search for the key */
1135
1136 while (*s != 0)
1137 {
1138 int dkeylength;
1139 uschar *data;
1140 const uschar *dkey = s;
1141
1142 while (*s != 0 && *s != '=' && !isspace(*s)) s++;
1143 dkeylength = s - dkey;
1144 while (isspace(*s)) s++;
1145 if (*s == '=') while (isspace((*(++s))));
1146
1147 data = string_dequote(&s);
1148 if (length == dkeylength && strncmpic(key, dkey, length) == 0)
1149 return data;
1150
1151 while (isspace(*s)) s++;
1152 }
1153
1154 return NULL;
1155 }
1156
1157
1158
1159 static var_entry *
1160 find_var_ent(uschar * name)
1161 {
1162 int first = 0;
1163 int last = var_table_size;
1164
1165 while (last > first)
1166 {
1167 int middle = (first + last)/2;
1168 int c = Ustrcmp(name, var_table[middle].name);
1169
1170 if (c > 0) { first = middle + 1; continue; }
1171 if (c < 0) { last = middle; continue; }
1172 return &var_table[middle];
1173 }
1174 return NULL;
1175 }
1176
1177 /*************************************************
1178 * Extract numbered subfield from string *
1179 *************************************************/
1180
1181 /* Extracts a numbered field from a string that is divided by tokens - for
1182 example a line from /etc/passwd is divided by colon characters. First field is
1183 numbered one. Negative arguments count from the right. Zero returns the whole
1184 string. Returns NULL if there are insufficient tokens in the string
1185
1186 ***WARNING***
1187 Modifies final argument - this is a dynamically generated string, so that's OK.
1188
1189 Arguments:
1190 field number of field to be extracted,
1191 first field = 1, whole string = 0, last field = -1
1192 separators characters that are used to break string into tokens
1193 s points to the string from which to extract the subfield
1194
1195 Returns: NULL if the field was not found,
1196 a pointer to the field's data inside s (modified to add 0)
1197 */
1198
1199 static uschar *
1200 expand_gettokened (int field, uschar *separators, uschar *s)
1201 {
1202 int sep = 1;
1203 int count;
1204 uschar *ss = s;
1205 uschar *fieldtext = NULL;
1206
1207 if (field == 0) return s;
1208
1209 /* Break the line up into fields in place; for field > 0 we stop when we have
1210 done the number of fields we want. For field < 0 we continue till the end of
1211 the string, counting the number of fields. */
1212
1213 count = (field > 0)? field : INT_MAX;
1214
1215 while (count-- > 0)
1216 {
1217 size_t len;
1218
1219 /* Previous field was the last one in the string. For a positive field
1220 number, this means there are not enough fields. For a negative field number,
1221 check that there are enough, and scan back to find the one that is wanted. */
1222
1223 if (sep == 0)
1224 {
1225 if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL;
1226 if ((-field) == (INT_MAX - count - 1)) return s;
1227 while (field++ < 0)
1228 {
1229 ss--;
1230 while (ss[-1] != 0) ss--;
1231 }
1232 fieldtext = ss;
1233 break;
1234 }
1235
1236 /* Previous field was not last in the string; save its start and put a
1237 zero at its end. */
1238
1239 fieldtext = ss;
1240 len = Ustrcspn(ss, separators);
1241 sep = ss[len];
1242 ss[len] = 0;
1243 ss += len + 1;
1244 }
1245
1246 return fieldtext;
1247 }
1248
1249
1250 static uschar *
1251 expand_getlistele(int field, const uschar * list)
1252 {
1253 const uschar * tlist= list;
1254 int sep= 0;
1255 uschar dummy;
1256
1257 if(field<0)
1258 {
1259 for(field++; string_nextinlist(&tlist, &sep, &dummy, 1); ) field++;
1260 sep= 0;
1261 }
1262 if(field==0) return NULL;
1263 while(--field>0 && (string_nextinlist(&list, &sep, &dummy, 1))) ;
1264 return string_nextinlist(&list, &sep, NULL, 0);
1265 }
1266
1267
1268 /* Certificate fields, by name. Worry about by-OID later */
1269 /* Names are chosen to not have common prefixes */
1270
1271 #ifdef SUPPORT_TLS
1272 typedef struct
1273 {
1274 uschar * name;
1275 int namelen;
1276 uschar * (*getfn)(void * cert, uschar * mod);
1277 } certfield;
1278 static certfield certfields[] =
1279 { /* linear search; no special order */
1280 { US"version", 7, &tls_cert_version },
1281 { US"serial_number", 13, &tls_cert_serial_number },
1282 { US"subject", 7, &tls_cert_subject },
1283 { US"notbefore", 9, &tls_cert_not_before },
1284 { US"notafter", 8, &tls_cert_not_after },
1285 { US"issuer", 6, &tls_cert_issuer },
1286 { US"signature", 9, &tls_cert_signature },
1287 { US"sig_algorithm", 13, &tls_cert_signature_algorithm },
1288 { US"subj_altname", 12, &tls_cert_subject_altname },
1289 { US"ocsp_uri", 8, &tls_cert_ocsp_uri },
1290 { US"crl_uri", 7, &tls_cert_crl_uri },
1291 };
1292
1293 static uschar *
1294 expand_getcertele(uschar * field, uschar * certvar)
1295 {
1296 var_entry * vp;
1297 certfield * cp;
1298
1299 if (!(vp = find_var_ent(certvar)))
1300 {
1301 expand_string_message =
1302 string_sprintf("no variable named \"%s\"", certvar);
1303 return NULL; /* Unknown variable name */
1304 }
1305 /* NB this stops us passing certs around in variable. Might
1306 want to do that in future */
1307 if (vp->type != vtype_cert)
1308 {
1309 expand_string_message =
1310 string_sprintf("\"%s\" is not a certificate", certvar);
1311 return NULL; /* Unknown variable name */
1312 }
1313 if (!*(void **)vp->value)
1314 return NULL;
1315
1316 if (*field >= '0' && *field <= '9')
1317 return tls_cert_ext_by_oid(*(void **)vp->value, field, 0);
1318
1319 for(cp = certfields;
1320 cp < certfields + nelem(certfields);
1321 cp++)
1322 if (Ustrncmp(cp->name, field, cp->namelen) == 0)
1323 {
1324 uschar * modifier = *(field += cp->namelen) == ','
1325 ? ++field : NULL;
1326 return (*cp->getfn)( *(void **)vp->value, modifier );
1327 }
1328
1329 expand_string_message =
1330 string_sprintf("bad field selector \"%s\" for certextract", field);
1331 return NULL;
1332 }
1333 #endif /*SUPPORT_TLS*/
1334
1335 /*************************************************
1336 * Extract a substring from a string *
1337 *************************************************/
1338
1339 /* Perform the ${substr or ${length expansion operations.
1340
1341 Arguments:
1342 subject the input string
1343 value1 the offset from the start of the input string to the start of
1344 the output string; if negative, count from the right.
1345 value2 the length of the output string, or negative (-1) for unset
1346 if value1 is positive, unset means "all after"
1347 if value1 is negative, unset means "all before"
1348 len set to the length of the returned string
1349
1350 Returns: pointer to the output string, or NULL if there is an error
1351 */
1352
1353 static uschar *
1354 extract_substr(uschar *subject, int value1, int value2, int *len)
1355 {
1356 int sublen = Ustrlen(subject);
1357
1358 if (value1 < 0) /* count from right */
1359 {
1360 value1 += sublen;
1361
1362 /* If the position is before the start, skip to the start, and adjust the
1363 length. If the length ends up negative, the substring is null because nothing
1364 can precede. This falls out naturally when the length is unset, meaning "all
1365 to the left". */
1366
1367 if (value1 < 0)
1368 {
1369 value2 += value1;
1370 if (value2 < 0) value2 = 0;
1371 value1 = 0;
1372 }
1373
1374 /* Otherwise an unset length => characters before value1 */
1375
1376 else if (value2 < 0)
1377 {
1378 value2 = value1;
1379 value1 = 0;
1380 }
1381 }
1382
1383 /* For a non-negative offset, if the starting position is past the end of the
1384 string, the result will be the null string. Otherwise, an unset length means
1385 "rest"; just set it to the maximum - it will be cut down below if necessary. */
1386
1387 else
1388 {
1389 if (value1 > sublen)
1390 {
1391 value1 = sublen;
1392 value2 = 0;
1393 }
1394 else if (value2 < 0) value2 = sublen;
1395 }
1396
1397 /* Cut the length down to the maximum possible for the offset value, and get
1398 the required characters. */
1399
1400 if (value1 + value2 > sublen) value2 = sublen - value1;
1401 *len = value2;
1402 return subject + value1;
1403 }
1404
1405
1406
1407
1408 /*************************************************
1409 * Old-style hash of a string *
1410 *************************************************/
1411
1412 /* Perform the ${hash expansion operation.
1413
1414 Arguments:
1415 subject the input string (an expanded substring)
1416 value1 the length of the output string; if greater or equal to the
1417 length of the input string, the input string is returned
1418 value2 the number of hash characters to use, or 26 if negative
1419 len set to the length of the returned string
1420
1421 Returns: pointer to the output string, or NULL if there is an error
1422 */
1423
1424 static uschar *
1425 compute_hash(uschar *subject, int value1, int value2, int *len)
1426 {
1427 int sublen = Ustrlen(subject);
1428
1429 if (value2 < 0) value2 = 26;
1430 else if (value2 > Ustrlen(hashcodes))
1431 {
1432 expand_string_message =
1433 string_sprintf("hash count \"%d\" too big", value2);
1434 return NULL;
1435 }
1436
1437 /* Calculate the hash text. We know it is shorter than the original string, so
1438 can safely place it in subject[] (we know that subject is always itself an
1439 expanded substring). */
1440
1441 if (value1 < sublen)
1442 {
1443 int c;
1444 int i = 0;
1445 int j = value1;
1446 while ((c = (subject[j])) != 0)
1447 {
1448 int shift = (c + j++) & 7;
1449 subject[i] ^= (c << shift) | (c >> (8-shift));
1450 if (++i >= value1) i = 0;
1451 }
1452 for (i = 0; i < value1; i++)
1453 subject[i] = hashcodes[(subject[i]) % value2];
1454 }
1455 else value1 = sublen;
1456
1457 *len = value1;
1458 return subject;
1459 }
1460
1461
1462
1463
1464 /*************************************************
1465 * Numeric hash of a string *
1466 *************************************************/
1467
1468 /* Perform the ${nhash expansion operation. The first characters of the
1469 string are treated as most important, and get the highest prime numbers.
1470
1471 Arguments:
1472 subject the input string
1473 value1 the maximum value of the first part of the result
1474 value2 the maximum value of the second part of the result,
1475 or negative to produce only a one-part result
1476 len set to the length of the returned string
1477
1478 Returns: pointer to the output string, or NULL if there is an error.
1479 */
1480
1481 static uschar *
1482 compute_nhash (uschar *subject, int value1, int value2, int *len)
1483 {
1484 uschar *s = subject;
1485 int i = 0;
1486 unsigned long int total = 0; /* no overflow */
1487
1488 while (*s != 0)
1489 {
1490 if (i == 0) i = nelem(prime) - 1;
1491 total += prime[i--] * (unsigned int)(*s++);
1492 }
1493
1494 /* If value2 is unset, just compute one number */
1495
1496 if (value2 < 0)
1497 s = string_sprintf("%lu", total % value1);
1498
1499 /* Otherwise do a div/mod hash */
1500
1501 else
1502 {
1503 total = total % (value1 * value2);
1504 s = string_sprintf("%lu/%lu", total/value2, total % value2);
1505 }
1506
1507 *len = Ustrlen(s);
1508 return s;
1509 }
1510
1511
1512
1513
1514
1515 /*************************************************
1516 * Find the value of a header or headers *
1517 *************************************************/
1518
1519 /* Multiple instances of the same header get concatenated, and this function
1520 can also return a concatenation of all the header lines. When concatenating
1521 specific headers that contain lists of addresses, a comma is inserted between
1522 them. Otherwise we use a straight concatenation. Because some messages can have
1523 pathologically large number of lines, there is a limit on the length that is
1524 returned. Also, to avoid massive store use which would result from using
1525 string_cat() as it copies and extends strings, we do a preliminary pass to find
1526 out exactly how much store will be needed. On "normal" messages this will be
1527 pretty trivial.
1528
1529 Arguments:
1530 name the name of the header, without the leading $header_ or $h_,
1531 or NULL if a concatenation of all headers is required
1532 exists_only TRUE if called from a def: test; don't need to build a string;
1533 just return a string that is not "" and not "0" if the header
1534 exists
1535 newsize return the size of memory block that was obtained; may be NULL
1536 if exists_only is TRUE
1537 want_raw TRUE if called for $rh_ or $rheader_ variables; no processing,
1538 other than concatenating, will be done on the header. Also used
1539 for $message_headers_raw.
1540 charset name of charset to translate MIME words to; used only if
1541 want_raw is false; if NULL, no translation is done (this is
1542 used for $bh_ and $bheader_)
1543
1544 Returns: NULL if the header does not exist, else a pointer to a new
1545 store block
1546 */
1547
1548 static uschar *
1549 find_header(uschar *name, BOOL exists_only, int *newsize, BOOL want_raw,
1550 uschar *charset)
1551 {
1552 BOOL found = name == NULL;
1553 int comma = 0;
1554 int len = found? 0 : Ustrlen(name);
1555 int i;
1556 uschar *yield = NULL;
1557 uschar *ptr = NULL;
1558
1559 /* Loop for two passes - saves code repetition */
1560
1561 for (i = 0; i < 2; i++)
1562 {
1563 int size = 0;
1564 header_line *h;
1565
1566 for (h = header_list; size < header_insert_maxlen && h; h = h->next)
1567 if (h->type != htype_old && h->text) /* NULL => Received: placeholder */
1568 if (!name || (len <= h->slen && strncmpic(name, h->text, len) == 0))
1569 {
1570 int ilen;
1571 uschar *t;
1572
1573 if (exists_only) return US"1"; /* don't need actual string */
1574 found = TRUE;
1575 t = h->text + len; /* text to insert */
1576 if (!want_raw) /* unless wanted raw, */
1577 while (isspace(*t)) t++; /* remove leading white space */
1578 ilen = h->slen - (t - h->text); /* length to insert */
1579
1580 /* Unless wanted raw, remove trailing whitespace, including the
1581 newline. */
1582
1583 if (!want_raw)
1584 while (ilen > 0 && isspace(t[ilen-1])) ilen--;
1585
1586 /* Set comma = 1 if handling a single header and it's one of those
1587 that contains an address list, except when asked for raw headers. Only
1588 need to do this once. */
1589
1590 if (!want_raw && name && comma == 0 &&
1591 Ustrchr("BCFRST", h->type) != NULL)
1592 comma = 1;
1593
1594 /* First pass - compute total store needed; second pass - compute
1595 total store used, including this header. */
1596
1597 size += ilen + comma + 1; /* +1 for the newline */
1598
1599 /* Second pass - concatenate the data, up to a maximum. Note that
1600 the loop stops when size hits the limit. */
1601
1602 if (i != 0)
1603 {
1604 if (size > header_insert_maxlen)
1605 {
1606 ilen -= size - header_insert_maxlen - 1;
1607 comma = 0;
1608 }
1609 Ustrncpy(ptr, t, ilen);
1610 ptr += ilen;
1611
1612 /* For a non-raw header, put in the comma if needed, then add
1613 back the newline we removed above, provided there was some text in
1614 the header. */
1615
1616 if (!want_raw && ilen > 0)
1617 {
1618 if (comma != 0) *ptr++ = ',';
1619 *ptr++ = '\n';
1620 }
1621 }
1622 }
1623
1624 /* At end of first pass, return NULL if no header found. Then truncate size
1625 if necessary, and get the buffer to hold the data, returning the buffer size.
1626 */
1627
1628 if (i == 0)
1629 {
1630 if (!found) return NULL;
1631 if (size > header_insert_maxlen) size = header_insert_maxlen;
1632 *newsize = size + 1;
1633 ptr = yield = store_get(*newsize);
1634 }
1635 }
1636
1637 /* That's all we do for raw header expansion. */
1638
1639 if (want_raw)
1640 *ptr = 0;
1641
1642 /* Otherwise, remove a final newline and a redundant added comma. Then we do
1643 RFC 2047 decoding, translating the charset if requested. The rfc2047_decode2()
1644 function can return an error with decoded data if the charset translation
1645 fails. If decoding fails, it returns NULL. */
1646
1647 else
1648 {
1649 uschar *decoded, *error;
1650 if (ptr > yield && ptr[-1] == '\n') ptr--;
1651 if (ptr > yield && comma != 0 && ptr[-1] == ',') ptr--;
1652 *ptr = 0;
1653 decoded = rfc2047_decode2(yield, check_rfc2047_length, charset, '?', NULL,
1654 newsize, &error);
1655 if (error != NULL)
1656 {
1657 DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n"
1658 " input was: %s\n", error, yield);
1659 }
1660 if (decoded != NULL) yield = decoded;
1661 }
1662
1663 return yield;
1664 }
1665
1666
1667
1668
1669 /* Append a "local" element to an Autherntication-Results: header
1670 if this was a non-smtp message.
1671 */
1672
1673 static gstring *
1674 authres_local(gstring * g, const uschar * sysname)
1675 {
1676 if (!authentication_local)
1677 return g;
1678 g = string_append(g, 3, US";\n\tlocal=pass (non-smtp, ", sysname, US")");
1679 if (authenticated_id) g = string_append(g, 2, " u=", authenticated_id);
1680 return g;
1681 }
1682
1683
1684 /* Append an "iprev" element to an Autherntication-Results: header
1685 if we have attempted to get the calling host's name.
1686 */
1687
1688 static gstring *
1689 authres_iprev(gstring * g)
1690 {
1691 if (sender_host_name)
1692 return string_append(g, sender_host_address ? 5 : 3,
1693 US";\n\tiprev=pass (", sender_host_name, US")",
1694 US" smtp.client-ip=", sender_host_address);
1695 if (host_lookup_deferred)
1696 return string_catn(g, US";\n\tiprev=temperror", 19);
1697 if (host_lookup_failed)
1698 return string_catn(g, US";\n\tiprev=fail", 13);
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 gstring * g = NULL;
1715 int i;
1716
1717 if (!enable_dollar_recipients) return NULL;
1718
1719 for (i = 0; i < recipients_count; i++)
1720 {
1721 /*XXX variant of list_appendele? */
1722 if (i != 0) g = string_catn(g, US", ", 2);
1723 g = string_cat(g, recipients_list[i].address);
1724 }
1725 return string_from_gstring(g);
1726 }
1727
1728
1729 /*************************************************
1730 * Find value of a variable *
1731 *************************************************/
1732
1733 /* The table of variables is kept in alphabetic order, so we can search it
1734 using a binary chop. The "choplen" variable is nothing to do with the binary
1735 chop.
1736
1737 Arguments:
1738 name the name of the variable being sought
1739 exists_only TRUE if this is a def: test; passed on to find_header()
1740 skipping TRUE => skip any processing evaluation; this is not the same as
1741 exists_only because def: may test for values that are first
1742 evaluated here
1743 newsize pointer to an int which is initially zero; if the answer is in
1744 a new memory buffer, *newsize is set to its size
1745
1746 Returns: NULL if the variable does not exist, or
1747 a pointer to the variable's contents, or
1748 something non-NULL if exists_only is TRUE
1749 */
1750
1751 static uschar *
1752 find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize)
1753 {
1754 var_entry * vp;
1755 uschar *s, *domain;
1756 uschar **ss;
1757 void * val;
1758
1759 /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx.
1760 Originally, xxx had to be a number in the range 0-9 (later 0-19), but from
1761 release 4.64 onwards arbitrary names are permitted, as long as the first 5
1762 characters are acl_c or acl_m and the sixth is either a digit or an underscore
1763 (this gave backwards compatibility at the changeover). There may be built-in
1764 variables whose names start acl_ but they should never start in this way. This
1765 slightly messy specification is a consequence of the history, needless to say.
1766
1767 If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is
1768 set, in which case give an error. */
1769
1770 if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) &&
1771 !isalpha(name[5]))
1772 {
1773 tree_node *node =
1774 tree_search((name[4] == 'c')? acl_var_c : acl_var_m, name + 4);
1775 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1776 }
1777
1778 /* Handle $auth<n> variables. */
1779
1780 if (Ustrncmp(name, "auth", 4) == 0)
1781 {
1782 uschar *endptr;
1783 int n = Ustrtoul(name + 4, &endptr, 10);
1784 if (*endptr == 0 && n != 0 && n <= AUTH_VARS)
1785 return !auth_vars[n-1] ? US"" : auth_vars[n-1];
1786 }
1787 else if (Ustrncmp(name, "regex", 5) == 0)
1788 {
1789 uschar *endptr;
1790 int n = Ustrtoul(name + 5, &endptr, 10);
1791 if (*endptr == 0 && n != 0 && n <= REGEX_VARS)
1792 return !regex_vars[n-1] ? US"" : regex_vars[n-1];
1793 }
1794
1795 /* For all other variables, search the table */
1796
1797 if (!(vp = find_var_ent(name)))
1798 return NULL; /* Unknown variable name */
1799
1800 /* Found an existing variable. If in skipping state, the value isn't needed,
1801 and we want to avoid processing (such as looking up the host name). */
1802
1803 if (skipping)
1804 return US"";
1805
1806 val = vp->value;
1807 switch (vp->type)
1808 {
1809 case vtype_filter_int:
1810 if (!filter_running) return NULL;
1811 /* Fall through */
1812 /* VVVVVVVVVVVV */
1813 case vtype_int:
1814 sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */
1815 return var_buffer;
1816
1817 case vtype_ino:
1818 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */
1819 return var_buffer;
1820
1821 case vtype_gid:
1822 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */
1823 return var_buffer;
1824
1825 case vtype_uid:
1826 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */
1827 return var_buffer;
1828
1829 case vtype_bool:
1830 sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */
1831 return var_buffer;
1832
1833 case vtype_stringptr: /* Pointer to string */
1834 return (s = *((uschar **)(val))) ? s : US"";
1835
1836 case vtype_pid:
1837 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
1838 return var_buffer;
1839
1840 case vtype_load_avg:
1841 sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */
1842 return var_buffer;
1843
1844 case vtype_host_lookup: /* Lookup if not done so */
1845 if ( !sender_host_name && sender_host_address
1846 && !host_lookup_failed && host_name_lookup() == OK)
1847 host_build_sender_fullhost();
1848 return sender_host_name ? sender_host_name : US"";
1849
1850 case vtype_localpart: /* Get local part from address */
1851 s = *((uschar **)(val));
1852 if (s == NULL) return US"";
1853 domain = Ustrrchr(s, '@');
1854 if (domain == NULL) return s;
1855 if (domain - s > sizeof(var_buffer) - 1)
1856 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT
1857 " in string expansion", sizeof(var_buffer));
1858 Ustrncpy(var_buffer, s, domain - s);
1859 var_buffer[domain - s] = 0;
1860 return var_buffer;
1861
1862 case vtype_domain: /* Get domain from address */
1863 s = *((uschar **)(val));
1864 if (s == NULL) return US"";
1865 domain = Ustrrchr(s, '@');
1866 return (domain == NULL)? US"" : domain + 1;
1867
1868 case vtype_msgheaders:
1869 return find_header(NULL, exists_only, newsize, FALSE, NULL);
1870
1871 case vtype_msgheaders_raw:
1872 return find_header(NULL, exists_only, newsize, TRUE, 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:", exists_only, newsize, TRUE,
1938 headers_charset);
1939 if (s) while (isspace(*s)) s++;
1940 if (!s || !*s)
1941 {
1942 *newsize = 0; /* For the *s==0 case */
1943 s = find_header(US"from:", exists_only, newsize, TRUE, headers_charset);
1944 }
1945 if (s)
1946 {
1947 uschar *t;
1948 while (isspace(*s)) s++;
1949 for (t = s; *t != 0; t++) if (*t == '\n') *t = ' ';
1950 while (t > s && isspace(t[-1])) t--;
1951 *t = 0;
1952 }
1953 return s ? s : US"";
1954
1955 case vtype_string_func:
1956 {
1957 uschar * (*fn)() = val;
1958 return fn();
1959 }
1960
1961 case vtype_pspace:
1962 {
1963 int inodes;
1964 sprintf(CS var_buffer, "%d",
1965 receive_statvfs(val == (void *)TRUE, &inodes));
1966 }
1967 return var_buffer;
1968
1969 case vtype_pinodes:
1970 {
1971 int inodes;
1972 (void) receive_statvfs(val == (void *)TRUE, &inodes);
1973 sprintf(CS var_buffer, "%d", inodes);
1974 }
1975 return var_buffer;
1976
1977 case vtype_cert:
1978 return *(void **)val ? US"<cert>" : US"";
1979
1980 #ifndef DISABLE_DKIM
1981 case vtype_dkim:
1982 return dkim_exim_expand_query((int)(long)val);
1983 #endif
1984
1985 }
1986
1987 return NULL; /* Unknown variable. Silences static checkers. */
1988 }
1989
1990
1991
1992
1993 void
1994 modify_variable(uschar *name, void * value)
1995 {
1996 var_entry * vp;
1997 if ((vp = find_var_ent(name))) vp->value = value;
1998 return; /* Unknown variable name, fail silently */
1999 }
2000
2001
2002
2003
2004
2005
2006 /*************************************************
2007 * Read and expand substrings *
2008 *************************************************/
2009
2010 /* This function is called to read and expand argument substrings for various
2011 expansion items. Some have a minimum requirement that is less than the maximum;
2012 in these cases, the first non-present one is set to NULL.
2013
2014 Arguments:
2015 sub points to vector of pointers to set
2016 n maximum number of substrings
2017 m minimum required
2018 sptr points to current string pointer
2019 skipping the skipping flag
2020 check_end if TRUE, check for final '}'
2021 name name of item, for error message
2022 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
2023 the store.
2024
2025 Returns: 0 OK; string pointer updated
2026 1 curly bracketing error (too few arguments)
2027 2 too many arguments (only if check_end is set); message set
2028 3 other error (expansion failure)
2029 */
2030
2031 static int
2032 read_subs(uschar **sub, int n, int m, const uschar **sptr, BOOL skipping,
2033 BOOL check_end, uschar *name, BOOL *resetok)
2034 {
2035 int i;
2036 const uschar *s = *sptr;
2037
2038 while (isspace(*s)) s++;
2039 for (i = 0; i < n; i++)
2040 {
2041 if (*s != '{')
2042 {
2043 if (i < m)
2044 {
2045 expand_string_message = string_sprintf("Not enough arguments for '%s' "
2046 "(min is %d)", name, m);
2047 return 1;
2048 }
2049 sub[i] = NULL;
2050 break;
2051 }
2052 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, resetok)))
2053 return 3;
2054 if (*s++ != '}') return 1;
2055 while (isspace(*s)) s++;
2056 }
2057 if (check_end && *s++ != '}')
2058 {
2059 if (s[-1] == '{')
2060 {
2061 expand_string_message = string_sprintf("Too many arguments for '%s' "
2062 "(max is %d)", name, n);
2063 return 2;
2064 }
2065 expand_string_message = string_sprintf("missing '}' after '%s'", name);
2066 return 1;
2067 }
2068
2069 *sptr = s;
2070 return 0;
2071 }
2072
2073
2074
2075
2076 /*************************************************
2077 * Elaborate message for bad variable *
2078 *************************************************/
2079
2080 /* For the "unknown variable" message, take a look at the variable's name, and
2081 give additional information about possible ACL variables. The extra information
2082 is added on to expand_string_message.
2083
2084 Argument: the name of the variable
2085 Returns: nothing
2086 */
2087
2088 static void
2089 check_variable_error_message(uschar *name)
2090 {
2091 if (Ustrncmp(name, "acl_", 4) == 0)
2092 expand_string_message = string_sprintf("%s (%s)", expand_string_message,
2093 (name[4] == 'c' || name[4] == 'm')?
2094 (isalpha(name[5])?
2095 US"6th character of a user-defined ACL variable must be a digit or underscore" :
2096 US"strict_acl_vars is set" /* Syntax is OK, it has to be this */
2097 ) :
2098 US"user-defined ACL variables must start acl_c or acl_m");
2099 }
2100
2101
2102
2103 /*
2104 Load args from sub array to globals, and call acl_check().
2105 Sub array will be corrupted on return.
2106
2107 Returns: OK access is granted by an ACCEPT verb
2108 DISCARD access is (apparently) granted by a DISCARD verb
2109 FAIL access is denied
2110 FAIL_DROP access is denied; drop the connection
2111 DEFER can't tell at the moment
2112 ERROR disaster
2113 */
2114 static int
2115 eval_acl(uschar ** sub, int nsub, uschar ** user_msgp)
2116 {
2117 int i;
2118 int sav_narg = acl_narg;
2119 int ret;
2120 uschar * dummy_logmsg;
2121 extern int acl_where;
2122
2123 if(--nsub > nelem(acl_arg)) nsub = nelem(acl_arg);
2124 for (i = 0; i < nsub && sub[i+1]; i++)
2125 {
2126 uschar * tmp = acl_arg[i];
2127 acl_arg[i] = sub[i+1]; /* place callers args in the globals */
2128 sub[i+1] = tmp; /* stash the old args using our caller's storage */
2129 }
2130 acl_narg = i;
2131 while (i < nsub)
2132 {
2133 sub[i+1] = acl_arg[i];
2134 acl_arg[i++] = NULL;
2135 }
2136
2137 DEBUG(D_expand)
2138 debug_printf_indent("expanding: acl: %s arg: %s%s\n",
2139 sub[0],
2140 acl_narg>0 ? acl_arg[0] : US"<none>",
2141 acl_narg>1 ? " +more" : "");
2142
2143 ret = acl_eval(acl_where, sub[0], user_msgp, &dummy_logmsg);
2144
2145 for (i = 0; i < nsub; i++)
2146 acl_arg[i] = sub[i+1]; /* restore old args */
2147 acl_narg = sav_narg;
2148
2149 return ret;
2150 }
2151
2152
2153
2154
2155 /*************************************************
2156 * Read and evaluate a condition *
2157 *************************************************/
2158
2159 /*
2160 Arguments:
2161 s points to the start of the condition text
2162 resetok points to a BOOL which is written false if it is unsafe to
2163 free memory. Certain condition types (acl) may have side-effect
2164 allocation which must be preserved.
2165 yield points to a BOOL to hold the result of the condition test;
2166 if NULL, we are just reading through a condition that is
2167 part of an "or" combination to check syntax, or in a state
2168 where the answer isn't required
2169
2170 Returns: a pointer to the first character after the condition, or
2171 NULL after an error
2172 */
2173
2174 static const uschar *
2175 eval_condition(const uschar *s, BOOL *resetok, BOOL *yield)
2176 {
2177 BOOL testfor = TRUE;
2178 BOOL tempcond, combined_cond;
2179 BOOL *subcondptr;
2180 BOOL sub2_honour_dollar = TRUE;
2181 int i, rc, cond_type, roffset;
2182 int_eximarith_t num[2];
2183 struct stat statbuf;
2184 uschar name[256];
2185 const uschar *sub[10];
2186
2187 const pcre *re;
2188 const uschar *rerror;
2189
2190 for (;;)
2191 {
2192 while (isspace(*s)) s++;
2193 if (*s == '!') { testfor = !testfor; s++; } else break;
2194 }
2195
2196 /* Numeric comparisons are symbolic */
2197
2198 if (*s == '=' || *s == '>' || *s == '<')
2199 {
2200 int p = 0;
2201 name[p++] = *s++;
2202 if (*s == '=')
2203 {
2204 name[p++] = '=';
2205 s++;
2206 }
2207 name[p] = 0;
2208 }
2209
2210 /* All other conditions are named */
2211
2212 else s = read_name(name, 256, s, US"_");
2213
2214 /* If we haven't read a name, it means some non-alpha character is first. */
2215
2216 if (name[0] == 0)
2217 {
2218 expand_string_message = string_sprintf("condition name expected, "
2219 "but found \"%.16s\"", s);
2220 return NULL;
2221 }
2222
2223 /* Find which condition we are dealing with, and switch on it */
2224
2225 cond_type = chop_match(name, cond_table, nelem(cond_table));
2226 switch(cond_type)
2227 {
2228 /* def: tests for a non-empty variable, or for the existence of a header. If
2229 yield == NULL we are in a skipping state, and don't care about the answer. */
2230
2231 case ECOND_DEF:
2232 if (*s != ':')
2233 {
2234 expand_string_message = US"\":\" expected after \"def\"";
2235 return NULL;
2236 }
2237
2238 s = read_name(name, 256, s+1, US"_");
2239
2240 /* Test for a header's existence. If the name contains a closing brace
2241 character, this may be a user error where the terminating colon has been
2242 omitted. Set a flag to adjust a subsequent error message in this case. */
2243
2244 if (Ustrncmp(name, "h_", 2) == 0 ||
2245 Ustrncmp(name, "rh_", 3) == 0 ||
2246 Ustrncmp(name, "bh_", 3) == 0 ||
2247 Ustrncmp(name, "header_", 7) == 0 ||
2248 Ustrncmp(name, "rheader_", 8) == 0 ||
2249 Ustrncmp(name, "bheader_", 8) == 0)
2250 {
2251 s = read_header_name(name, 256, s);
2252 /* {-for-text-editors */
2253 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
2254 if (yield != NULL) *yield =
2255 (find_header(name, TRUE, NULL, FALSE, NULL) != NULL) == testfor;
2256 }
2257
2258 /* Test for a variable's having a non-empty value. A non-existent variable
2259 causes an expansion failure. */
2260
2261 else
2262 {
2263 uschar *value = find_variable(name, TRUE, yield == NULL, NULL);
2264 if (value == NULL)
2265 {
2266 expand_string_message = (name[0] == 0)?
2267 string_sprintf("variable name omitted after \"def:\"") :
2268 string_sprintf("unknown variable \"%s\" after \"def:\"", name);
2269 check_variable_error_message(name);
2270 return NULL;
2271 }
2272 if (yield != NULL) *yield = (value[0] != 0) == testfor;
2273 }
2274
2275 return s;
2276
2277
2278 /* first_delivery tests for first delivery attempt */
2279
2280 case ECOND_FIRST_DELIVERY:
2281 if (yield != NULL) *yield = deliver_firsttime == testfor;
2282 return s;
2283
2284
2285 /* queue_running tests for any process started by a queue runner */
2286
2287 case ECOND_QUEUE_RUNNING:
2288 if (yield != NULL) *yield = (queue_run_pid != (pid_t)0) == testfor;
2289 return s;
2290
2291
2292 /* exists: tests for file existence
2293 isip: tests for any IP address
2294 isip4: tests for an IPv4 address
2295 isip6: tests for an IPv6 address
2296 pam: does PAM authentication
2297 radius: does RADIUS authentication
2298 ldapauth: does LDAP authentication
2299 pwcheck: does Cyrus SASL pwcheck authentication
2300 */
2301
2302 case ECOND_EXISTS:
2303 case ECOND_ISIP:
2304 case ECOND_ISIP4:
2305 case ECOND_ISIP6:
2306 case ECOND_PAM:
2307 case ECOND_RADIUS:
2308 case ECOND_LDAPAUTH:
2309 case ECOND_PWCHECK:
2310
2311 while (isspace(*s)) s++;
2312 if (*s != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2313
2314 sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL, TRUE, resetok);
2315 if (sub[0] == NULL) return NULL;
2316 /* {-for-text-editors */
2317 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2318
2319 if (yield == NULL) return s; /* No need to run the test if skipping */
2320
2321 switch(cond_type)
2322 {
2323 case ECOND_EXISTS:
2324 if ((expand_forbid & RDO_EXISTS) != 0)
2325 {
2326 expand_string_message = US"File existence tests are not permitted";
2327 return NULL;
2328 }
2329 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
2330 break;
2331
2332 case ECOND_ISIP:
2333 case ECOND_ISIP4:
2334 case ECOND_ISIP6:
2335 rc = string_is_ip_address(sub[0], NULL);
2336 *yield = ((cond_type == ECOND_ISIP)? (rc != 0) :
2337 (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor;
2338 break;
2339
2340 /* Various authentication tests - all optionally compiled */
2341
2342 case ECOND_PAM:
2343 #ifdef SUPPORT_PAM
2344 rc = auth_call_pam(sub[0], &expand_string_message);
2345 goto END_AUTH;
2346 #else
2347 goto COND_FAILED_NOT_COMPILED;
2348 #endif /* SUPPORT_PAM */
2349
2350 case ECOND_RADIUS:
2351 #ifdef RADIUS_CONFIG_FILE
2352 rc = auth_call_radius(sub[0], &expand_string_message);
2353 goto END_AUTH;
2354 #else
2355 goto COND_FAILED_NOT_COMPILED;
2356 #endif /* RADIUS_CONFIG_FILE */
2357
2358 case ECOND_LDAPAUTH:
2359 #ifdef LOOKUP_LDAP
2360 {
2361 /* Just to keep the interface the same */
2362 BOOL do_cache;
2363 int old_pool = store_pool;
2364 store_pool = POOL_SEARCH;
2365 rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL,
2366 &expand_string_message, &do_cache);
2367 store_pool = old_pool;
2368 }
2369 goto END_AUTH;
2370 #else
2371 goto COND_FAILED_NOT_COMPILED;
2372 #endif /* LOOKUP_LDAP */
2373
2374 case ECOND_PWCHECK:
2375 #ifdef CYRUS_PWCHECK_SOCKET
2376 rc = auth_call_pwcheck(sub[0], &expand_string_message);
2377 goto END_AUTH;
2378 #else
2379 goto COND_FAILED_NOT_COMPILED;
2380 #endif /* CYRUS_PWCHECK_SOCKET */
2381
2382 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
2383 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
2384 END_AUTH:
2385 if (rc == ERROR || rc == DEFER) return NULL;
2386 *yield = (rc == OK) == testfor;
2387 #endif
2388 }
2389 return s;
2390
2391
2392 /* call ACL (in a conditional context). Accept true, deny false.
2393 Defer is a forced-fail. Anything set by message= goes to $value.
2394 Up to ten parameters are used; we use the braces round the name+args
2395 like the saslauthd condition does, to permit a variable number of args.
2396 See also the expansion-item version EITEM_ACL and the traditional
2397 acl modifier ACLC_ACL.
2398 Since the ACL may allocate new global variables, tell our caller to not
2399 reclaim memory.
2400 */
2401
2402 case ECOND_ACL:
2403 /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */
2404 {
2405 uschar *sub[10];
2406 uschar *user_msg;
2407 BOOL cond = FALSE;
2408
2409 while (isspace(*s)) s++;
2410 if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/
2411
2412 switch(read_subs(sub, nelem(sub), 1,
2413 &s, yield == NULL, TRUE, US"acl", resetok))
2414 {
2415 case 1: expand_string_message = US"too few arguments or bracketing "
2416 "error for acl";
2417 case 2:
2418 case 3: return NULL;
2419 }
2420
2421 if (yield != NULL)
2422 {
2423 *resetok = FALSE; /* eval_acl() might allocate; do not reclaim */
2424 switch(eval_acl(sub, nelem(sub), &user_msg))
2425 {
2426 case OK:
2427 cond = TRUE;
2428 case FAIL:
2429 lookup_value = NULL;
2430 if (user_msg)
2431 lookup_value = string_copy(user_msg);
2432 *yield = cond == testfor;
2433 break;
2434
2435 case DEFER:
2436 expand_string_forcedfail = TRUE;
2437 /*FALLTHROUGH*/
2438 default:
2439 expand_string_message = string_sprintf("error from acl \"%s\"", sub[0]);
2440 return NULL;
2441 }
2442 }
2443 return s;
2444 }
2445
2446
2447 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
2448
2449 ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}}
2450
2451 However, the last two are optional. That is why the whole set is enclosed
2452 in their own set of braces. */
2453
2454 case ECOND_SASLAUTHD:
2455 #ifndef CYRUS_SASLAUTHD_SOCKET
2456 goto COND_FAILED_NOT_COMPILED;
2457 #else
2458 {
2459 uschar *sub[4];
2460 while (isspace(*s)) s++;
2461 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2462 switch(read_subs(sub, nelem(sub), 2, &s, yield == NULL, TRUE, US"saslauthd",
2463 resetok))
2464 {
2465 case 1: expand_string_message = US"too few arguments or bracketing "
2466 "error for saslauthd";
2467 case 2:
2468 case 3: return NULL;
2469 }
2470 if (sub[2] == NULL) sub[3] = NULL; /* realm if no service */
2471 if (yield != NULL)
2472 {
2473 int rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
2474 &expand_string_message);
2475 if (rc == ERROR || rc == DEFER) return NULL;
2476 *yield = (rc == OK) == testfor;
2477 }
2478 return s;
2479 }
2480 #endif /* CYRUS_SASLAUTHD_SOCKET */
2481
2482
2483 /* symbolic operators for numeric and string comparison, and a number of
2484 other operators, all requiring two arguments.
2485
2486 crypteq: encrypts plaintext and compares against an encrypted text,
2487 using crypt(), crypt16(), MD5 or SHA-1
2488 inlist/inlisti: checks if first argument is in the list of the second
2489 match: does a regular expression match and sets up the numerical
2490 variables if it succeeds
2491 match_address: matches in an address list
2492 match_domain: matches in a domain list
2493 match_ip: matches a host list that is restricted to IP addresses
2494 match_local_part: matches in a local part list
2495 */
2496
2497 case ECOND_MATCH_ADDRESS:
2498 case ECOND_MATCH_DOMAIN:
2499 case ECOND_MATCH_IP:
2500 case ECOND_MATCH_LOCAL_PART:
2501 #ifndef EXPAND_LISTMATCH_RHS
2502 sub2_honour_dollar = FALSE;
2503 #endif
2504 /* FALLTHROUGH */
2505
2506 case ECOND_CRYPTEQ:
2507 case ECOND_INLIST:
2508 case ECOND_INLISTI:
2509 case ECOND_MATCH:
2510
2511 case ECOND_NUM_L: /* Numerical comparisons */
2512 case ECOND_NUM_LE:
2513 case ECOND_NUM_E:
2514 case ECOND_NUM_EE:
2515 case ECOND_NUM_G:
2516 case ECOND_NUM_GE:
2517
2518 case ECOND_STR_LT: /* String comparisons */
2519 case ECOND_STR_LTI:
2520 case ECOND_STR_LE:
2521 case ECOND_STR_LEI:
2522 case ECOND_STR_EQ:
2523 case ECOND_STR_EQI:
2524 case ECOND_STR_GT:
2525 case ECOND_STR_GTI:
2526 case ECOND_STR_GE:
2527 case ECOND_STR_GEI:
2528
2529 for (i = 0; i < 2; i++)
2530 {
2531 /* Sometimes, we don't expand substrings; too many insecure configurations
2532 created using match_address{}{} and friends, where the second param
2533 includes information from untrustworthy sources. */
2534 BOOL honour_dollar = TRUE;
2535 if ((i > 0) && !sub2_honour_dollar)
2536 honour_dollar = FALSE;
2537
2538 while (isspace(*s)) s++;
2539 if (*s != '{')
2540 {
2541 if (i == 0) goto COND_FAILED_CURLY_START;
2542 expand_string_message = string_sprintf("missing 2nd string in {} "
2543 "after \"%s\"", name);
2544 return NULL;
2545 }
2546 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL,
2547 honour_dollar, resetok)))
2548 return NULL;
2549 DEBUG(D_expand) if (i == 1 && !sub2_honour_dollar && Ustrchr(sub[1], '$'))
2550 debug_printf_indent("WARNING: the second arg is NOT expanded,"
2551 " for security reasons\n");
2552 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2553
2554 /* Convert to numerical if required; we know that the names of all the
2555 conditions that compare numbers do not start with a letter. This just saves
2556 checking for them individually. */
2557
2558 if (!isalpha(name[0]) && yield != NULL)
2559 if (sub[i][0] == 0)
2560 {
2561 num[i] = 0;
2562 DEBUG(D_expand)
2563 debug_printf_indent("empty string cast to zero for numerical comparison\n");
2564 }
2565 else
2566 {
2567 num[i] = expanded_string_integer(sub[i], FALSE);
2568 if (expand_string_message != NULL) return NULL;
2569 }
2570 }
2571
2572 /* Result not required */
2573
2574 if (yield == NULL) return s;
2575
2576 /* Do an appropriate comparison */
2577
2578 switch(cond_type)
2579 {
2580 case ECOND_NUM_E:
2581 case ECOND_NUM_EE:
2582 tempcond = (num[0] == num[1]);
2583 break;
2584
2585 case ECOND_NUM_G:
2586 tempcond = (num[0] > num[1]);
2587 break;
2588
2589 case ECOND_NUM_GE:
2590 tempcond = (num[0] >= num[1]);
2591 break;
2592
2593 case ECOND_NUM_L:
2594 tempcond = (num[0] < num[1]);
2595 break;
2596
2597 case ECOND_NUM_LE:
2598 tempcond = (num[0] <= num[1]);
2599 break;
2600
2601 case ECOND_STR_LT:
2602 tempcond = (Ustrcmp(sub[0], sub[1]) < 0);
2603 break;
2604
2605 case ECOND_STR_LTI:
2606 tempcond = (strcmpic(sub[0], sub[1]) < 0);
2607 break;
2608
2609 case ECOND_STR_LE:
2610 tempcond = (Ustrcmp(sub[0], sub[1]) <= 0);
2611 break;
2612
2613 case ECOND_STR_LEI:
2614 tempcond = (strcmpic(sub[0], sub[1]) <= 0);
2615 break;
2616
2617 case ECOND_STR_EQ:
2618 tempcond = (Ustrcmp(sub[0], sub[1]) == 0);
2619 break;
2620
2621 case ECOND_STR_EQI:
2622 tempcond = (strcmpic(sub[0], sub[1]) == 0);
2623 break;
2624
2625 case ECOND_STR_GT:
2626 tempcond = (Ustrcmp(sub[0], sub[1]) > 0);
2627 break;
2628
2629 case ECOND_STR_GTI:
2630 tempcond = (strcmpic(sub[0], sub[1]) > 0);
2631 break;
2632
2633 case ECOND_STR_GE:
2634 tempcond = (Ustrcmp(sub[0], sub[1]) >= 0);
2635 break;
2636
2637 case ECOND_STR_GEI:
2638 tempcond = (strcmpic(sub[0], sub[1]) >= 0);
2639 break;
2640
2641 case ECOND_MATCH: /* Regular expression match */
2642 re = pcre_compile(CS sub[1], PCRE_COPT, (const char **)&rerror, &roffset,
2643 NULL);
2644 if (re == NULL)
2645 {
2646 expand_string_message = string_sprintf("regular expression error in "
2647 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
2648 return NULL;
2649 }
2650 tempcond = regex_match_and_setup(re, sub[0], 0, -1);
2651 break;
2652
2653 case ECOND_MATCH_ADDRESS: /* Match in an address list */
2654 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0, NULL);
2655 goto MATCHED_SOMETHING;
2656
2657 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
2658 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
2659 MCL_DOMAIN + MCL_NOEXPAND, TRUE, NULL);
2660 goto MATCHED_SOMETHING;
2661
2662 case ECOND_MATCH_IP: /* Match IP address in a host list */
2663 if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0)
2664 {
2665 expand_string_message = string_sprintf("\"%s\" is not an IP address",
2666 sub[0]);
2667 return NULL;
2668 }
2669 else
2670 {
2671 unsigned int *nullcache = NULL;
2672 check_host_block cb;
2673
2674 cb.host_name = US"";
2675 cb.host_address = sub[0];
2676
2677 /* If the host address starts off ::ffff: it is an IPv6 address in
2678 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
2679 addresses. */
2680
2681 cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)?
2682 cb.host_address + 7 : cb.host_address;
2683
2684 rc = match_check_list(
2685 &sub[1], /* the list */
2686 0, /* separator character */
2687 &hostlist_anchor, /* anchor pointer */
2688 &nullcache, /* cache pointer */
2689 check_host, /* function for testing */
2690 &cb, /* argument for function */
2691 MCL_HOST, /* type of check */
2692 sub[0], /* text for debugging */
2693 NULL); /* where to pass back data */
2694 }
2695 goto MATCHED_SOMETHING;
2696
2697 case ECOND_MATCH_LOCAL_PART:
2698 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
2699 MCL_LOCALPART + MCL_NOEXPAND, TRUE, NULL);
2700 /* Fall through */
2701 /* VVVVVVVVVVVV */
2702 MATCHED_SOMETHING:
2703 switch(rc)
2704 {
2705 case OK:
2706 tempcond = TRUE;
2707 break;
2708
2709 case FAIL:
2710 tempcond = FALSE;
2711 break;
2712
2713 case DEFER:
2714 expand_string_message = string_sprintf("unable to complete match "
2715 "against \"%s\": %s", sub[1], search_error_message);
2716 return NULL;
2717 }
2718
2719 break;
2720
2721 /* Various "encrypted" comparisons. If the second string starts with
2722 "{" then an encryption type is given. Default to crypt() or crypt16()
2723 (build-time choice). */
2724 /* }-for-text-editors */
2725
2726 case ECOND_CRYPTEQ:
2727 #ifndef SUPPORT_CRYPTEQ
2728 goto COND_FAILED_NOT_COMPILED;
2729 #else
2730 if (strncmpic(sub[1], US"{md5}", 5) == 0)
2731 {
2732 int sublen = Ustrlen(sub[1]+5);
2733 md5 base;
2734 uschar digest[16];
2735
2736 md5_start(&base);
2737 md5_end(&base, sub[0], Ustrlen(sub[0]), digest);
2738
2739 /* If the length that we are comparing against is 24, the MD5 digest
2740 is expressed as a base64 string. This is the way LDAP does it. However,
2741 some other software uses a straightforward hex representation. We assume
2742 this if the length is 32. Other lengths fail. */
2743
2744 if (sublen == 24)
2745 {
2746 uschar *coded = b64encode(digest, 16);
2747 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
2748 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
2749 tempcond = (Ustrcmp(coded, sub[1]+5) == 0);
2750 }
2751 else if (sublen == 32)
2752 {
2753 int i;
2754 uschar coded[36];
2755 for (i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
2756 coded[32] = 0;
2757 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
2758 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
2759 tempcond = (strcmpic(coded, sub[1]+5) == 0);
2760 }
2761 else
2762 {
2763 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
2764 "fail\n crypted=%s\n", sub[1]+5);
2765 tempcond = FALSE;
2766 }
2767 }
2768
2769 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
2770 {
2771 int sublen = Ustrlen(sub[1]+6);
2772 hctx h;
2773 uschar digest[20];
2774
2775 sha1_start(&h);
2776 sha1_end(&h, sub[0], Ustrlen(sub[0]), digest);
2777
2778 /* If the length that we are comparing against is 28, assume the SHA1
2779 digest is expressed as a base64 string. If the length is 40, assume a
2780 straightforward hex representation. Other lengths fail. */
2781
2782 if (sublen == 28)
2783 {
2784 uschar *coded = b64encode(digest, 20);
2785 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
2786 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
2787 tempcond = (Ustrcmp(coded, sub[1]+6) == 0);
2788 }
2789 else if (sublen == 40)
2790 {
2791 int i;
2792 uschar coded[44];
2793 for (i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
2794 coded[40] = 0;
2795 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
2796 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
2797 tempcond = (strcmpic(coded, sub[1]+6) == 0);
2798 }
2799 else
2800 {
2801 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
2802 "fail\n crypted=%s\n", sub[1]+6);
2803 tempcond = FALSE;
2804 }
2805 }
2806
2807 else /* {crypt} or {crypt16} and non-{ at start */
2808 /* }-for-text-editors */
2809 {
2810 int which = 0;
2811 uschar *coded;
2812
2813 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
2814 {
2815 sub[1] += 7;
2816 which = 1;
2817 }
2818 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
2819 {
2820 sub[1] += 9;
2821 which = 2;
2822 }
2823 else if (sub[1][0] == '{') /* }-for-text-editors */
2824 {
2825 expand_string_message = string_sprintf("unknown encryption mechanism "
2826 "in \"%s\"", sub[1]);
2827 return NULL;
2828 }
2829
2830 switch(which)
2831 {
2832 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
2833 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
2834 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
2835 }
2836
2837 #define STR(s) # s
2838 #define XSTR(s) STR(s)
2839 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
2840 " subject=%s\n crypted=%s\n",
2841 which == 0 ? XSTR(DEFAULT_CRYPT) : which == 1 ? "crypt" : "crypt16",
2842 coded, sub[1]);
2843 #undef STR
2844 #undef XSTR
2845
2846 /* If the encrypted string contains fewer than two characters (for the
2847 salt), force failure. Otherwise we get false positives: with an empty
2848 string the yield of crypt() is an empty string! */
2849
2850 if (coded)
2851 tempcond = Ustrlen(sub[1]) < 2 ? FALSE : Ustrcmp(coded, sub[1]) == 0;
2852 else if (errno == EINVAL)
2853 tempcond = FALSE;
2854 else
2855 {
2856 expand_string_message = string_sprintf("crypt error: %s\n",
2857 US strerror(errno));
2858 return NULL;
2859 }
2860 }
2861 break;
2862 #endif /* SUPPORT_CRYPTEQ */
2863
2864 case ECOND_INLIST:
2865 case ECOND_INLISTI:
2866 {
2867 const uschar * list = sub[1];
2868 int sep = 0;
2869 uschar *save_iterate_item = iterate_item;
2870 int (*compare)(const uschar *, const uschar *);
2871
2872 DEBUG(D_expand) debug_printf_indent("condition: %s item: %s\n", name, sub[0]);
2873
2874 tempcond = FALSE;
2875 compare = cond_type == ECOND_INLISTI
2876 ? strcmpic : (int (*)(const uschar *, const uschar *)) strcmp;
2877
2878 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
2879 {
2880 DEBUG(D_expand) debug_printf_indent(" compare %s\n", iterate_item);
2881 if (compare(sub[0], iterate_item) == 0)
2882 {
2883 tempcond = TRUE;
2884 break;
2885 }
2886 }
2887 iterate_item = save_iterate_item;
2888 }
2889
2890 } /* Switch for comparison conditions */
2891
2892 *yield = tempcond == testfor;
2893 return s; /* End of comparison conditions */
2894
2895
2896 /* and/or: computes logical and/or of several conditions */
2897
2898 case ECOND_AND:
2899 case ECOND_OR:
2900 subcondptr = (yield == NULL)? NULL : &tempcond;
2901 combined_cond = (cond_type == ECOND_AND);
2902
2903 while (isspace(*s)) s++;
2904 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2905
2906 for (;;)
2907 {
2908 while (isspace(*s)) s++;
2909 /* {-for-text-editors */
2910 if (*s == '}') break;
2911 if (*s != '{') /* }-for-text-editors */
2912 {
2913 expand_string_message = string_sprintf("each subcondition "
2914 "inside an \"%s{...}\" condition must be in its own {}", name);
2915 return NULL;
2916 }
2917
2918 if (!(s = eval_condition(s+1, resetok, subcondptr)))
2919 {
2920 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
2921 expand_string_message, name);
2922 return NULL;
2923 }
2924 while (isspace(*s)) s++;
2925
2926 /* {-for-text-editors */
2927 if (*s++ != '}')
2928 {
2929 /* {-for-text-editors */
2930 expand_string_message = string_sprintf("missing } at end of condition "
2931 "inside \"%s\" group", name);
2932 return NULL;
2933 }
2934
2935 if (yield != NULL)
2936 {
2937 if (cond_type == ECOND_AND)
2938 {
2939 combined_cond &= tempcond;
2940 if (!combined_cond) subcondptr = NULL; /* once false, don't */
2941 } /* evaluate any more */
2942 else
2943 {
2944 combined_cond |= tempcond;
2945 if (combined_cond) subcondptr = NULL; /* once true, don't */
2946 } /* evaluate any more */
2947 }
2948 }
2949
2950 if (yield != NULL) *yield = (combined_cond == testfor);
2951 return ++s;
2952
2953
2954 /* forall/forany: iterates a condition with different values */
2955
2956 case ECOND_FORALL:
2957 case ECOND_FORANY:
2958 {
2959 const uschar * list;
2960 int sep = 0;
2961 uschar *save_iterate_item = iterate_item;
2962
2963 DEBUG(D_expand) debug_printf_indent("condition: %s\n", name);
2964
2965 while (isspace(*s)) s++;
2966 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2967 sub[0] = expand_string_internal(s, TRUE, &s, (yield == NULL), TRUE, resetok);
2968 if (sub[0] == NULL) return NULL;
2969 /* {-for-text-editors */
2970 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2971
2972 while (isspace(*s)) s++;
2973 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2974
2975 sub[1] = s;
2976
2977 /* Call eval_condition once, with result discarded (as if scanning a
2978 "false" part). This allows us to find the end of the condition, because if
2979 the list it empty, we won't actually evaluate the condition for real. */
2980
2981 if (!(s = eval_condition(sub[1], resetok, NULL)))
2982 {
2983 expand_string_message = string_sprintf("%s inside \"%s\" condition",
2984 expand_string_message, name);
2985 return NULL;
2986 }
2987 while (isspace(*s)) s++;
2988
2989 /* {-for-text-editors */
2990 if (*s++ != '}')
2991 {
2992 /* {-for-text-editors */
2993 expand_string_message = string_sprintf("missing } at end of condition "
2994 "inside \"%s\"", name);
2995 return NULL;
2996 }
2997
2998 if (yield != NULL) *yield = !testfor;
2999 list = sub[0];
3000 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)) != NULL)
3001 {
3002 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, iterate_item);
3003 if (!eval_condition(sub[1], resetok, &tempcond))
3004 {
3005 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3006 expand_string_message, name);
3007 iterate_item = save_iterate_item;
3008 return NULL;
3009 }
3010 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", name,
3011 tempcond? "true":"false");
3012
3013 if (yield != NULL) *yield = (tempcond == testfor);
3014 if (tempcond == (cond_type == ECOND_FORANY)) break;
3015 }
3016
3017 iterate_item = save_iterate_item;
3018 return s;
3019 }
3020
3021
3022 /* The bool{} expansion condition maps a string to boolean.
3023 The values supported should match those supported by the ACL condition
3024 (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas
3025 of true/false. Note that Router "condition" rules have a different
3026 interpretation, where general data can be used and only a few values
3027 map to FALSE.
3028 Note that readconf.c boolean matching, for boolean configuration options,
3029 only matches true/yes/false/no.
3030 The bool_lax{} condition matches the Router logic, which is much more
3031 liberal. */
3032 case ECOND_BOOL:
3033 case ECOND_BOOL_LAX:
3034 {
3035 uschar *sub_arg[1];
3036 uschar *t, *t2;
3037 uschar *ourname;
3038 size_t len;
3039 BOOL boolvalue = FALSE;
3040 while (isspace(*s)) s++;
3041 if (*s != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3042 ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
3043 switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname, resetok))
3044 {
3045 case 1: expand_string_message = string_sprintf(
3046 "too few arguments or bracketing error for %s",
3047 ourname);
3048 /*FALLTHROUGH*/
3049 case 2:
3050 case 3: return NULL;
3051 }
3052 t = sub_arg[0];
3053 while (isspace(*t)) t++;
3054 len = Ustrlen(t);
3055 if (len)
3056 {
3057 /* trailing whitespace: seems like a good idea to ignore it too */
3058 t2 = t + len - 1;
3059 while (isspace(*t2)) t2--;
3060 if (t2 != (t + len))
3061 {
3062 *++t2 = '\0';
3063 len = t2 - t;
3064 }
3065 }
3066 DEBUG(D_expand)
3067 debug_printf_indent("considering %s: %s\n", ourname, len ? t : US"<empty>");
3068 /* logic for the lax case from expand_check_condition(), which also does
3069 expands, and the logic is both short and stable enough that there should
3070 be no maintenance burden from replicating it. */
3071 if (len == 0)
3072 boolvalue = FALSE;
3073 else if (*t == '-'
3074 ? Ustrspn(t+1, "0123456789") == len-1
3075 : Ustrspn(t, "0123456789") == len)
3076 {
3077 boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
3078 /* expand_check_condition only does a literal string "0" check */
3079 if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
3080 boolvalue = TRUE;
3081 }
3082 else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
3083 boolvalue = TRUE;
3084 else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
3085 boolvalue = FALSE;
3086 else if (cond_type == ECOND_BOOL_LAX)
3087 boolvalue = TRUE;
3088 else
3089 {
3090 expand_string_message = string_sprintf("unrecognised boolean "
3091 "value \"%s\"", t);
3092 return NULL;
3093 }
3094 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", ourname,
3095 boolvalue? "true":"false");
3096 if (yield != NULL) *yield = (boolvalue == testfor);
3097 return s;
3098 }
3099
3100 /* Unknown condition */
3101
3102 default:
3103 expand_string_message = string_sprintf("unknown condition \"%s\"", name);
3104 return NULL;
3105 } /* End switch on condition type */
3106
3107 /* Missing braces at start and end of data */
3108
3109 COND_FAILED_CURLY_START:
3110 expand_string_message = string_sprintf("missing { after \"%s\"", name);
3111 return NULL;
3112
3113 COND_FAILED_CURLY_END:
3114 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
3115 name);
3116 return NULL;
3117
3118 /* A condition requires code that is not compiled */
3119
3120 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
3121 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
3122 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
3123 COND_FAILED_NOT_COMPILED:
3124 expand_string_message = string_sprintf("support for \"%s\" not compiled",
3125 name);
3126 return NULL;
3127 #endif
3128 }
3129
3130
3131
3132
3133 /*************************************************
3134 * Save numerical variables *
3135 *************************************************/
3136
3137 /* This function is called from items such as "if" that want to preserve and
3138 restore the numbered variables.
3139
3140 Arguments:
3141 save_expand_string points to an array of pointers to set
3142 save_expand_nlength points to an array of ints for the lengths
3143
3144 Returns: the value of expand max to save
3145 */
3146
3147 static int
3148 save_expand_strings(uschar **save_expand_nstring, int *save_expand_nlength)
3149 {
3150 int i;
3151 for (i = 0; i <= expand_nmax; i++)
3152 {
3153 save_expand_nstring[i] = expand_nstring[i];
3154 save_expand_nlength[i] = expand_nlength[i];
3155 }
3156 return expand_nmax;
3157 }
3158
3159
3160
3161 /*************************************************
3162 * Restore numerical variables *
3163 *************************************************/
3164
3165 /* This function restored saved values of numerical strings.
3166
3167 Arguments:
3168 save_expand_nmax the number of strings to restore
3169 save_expand_string points to an array of pointers
3170 save_expand_nlength points to an array of ints
3171
3172 Returns: nothing
3173 */
3174
3175 static void
3176 restore_expand_strings(int save_expand_nmax, uschar **save_expand_nstring,
3177 int *save_expand_nlength)
3178 {
3179 int i;
3180 expand_nmax = save_expand_nmax;
3181 for (i = 0; i <= expand_nmax; i++)
3182 {
3183 expand_nstring[i] = save_expand_nstring[i];
3184 expand_nlength[i] = save_expand_nlength[i];
3185 }
3186 }
3187
3188
3189
3190
3191
3192 /*************************************************
3193 * Handle yes/no substrings *
3194 *************************************************/
3195
3196 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
3197 alternative substrings that depend on whether or not the condition was true,
3198 or the lookup or extraction succeeded. The substrings always have to be
3199 expanded, to check their syntax, but "skipping" is set when the result is not
3200 needed - this avoids unnecessary nested lookups.
3201
3202 Arguments:
3203 skipping TRUE if we were skipping when this item was reached
3204 yes TRUE if the first string is to be used, else use the second
3205 save_lookup a value to put back into lookup_value before the 2nd expansion
3206 sptr points to the input string pointer
3207 yieldptr points to the output growable-string pointer
3208 type "lookup", "if", "extract", "run", "env", "listextract" or
3209 "certextract" for error message
3210 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
3211 the store.
3212
3213 Returns: 0 OK; lookup_value has been reset to save_lookup
3214 1 expansion failed
3215 2 expansion failed because of bracketing error
3216 */
3217
3218 static int
3219 process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, const uschar **sptr,
3220 gstring ** yieldptr, uschar *type, BOOL *resetok)
3221 {
3222 int rc = 0;
3223 const uschar *s = *sptr; /* Local value */
3224 uschar *sub1, *sub2;
3225 const uschar * errwhere;
3226
3227 /* If there are no following strings, we substitute the contents of $value for
3228 lookups and for extractions in the success case. For the ${if item, the string
3229 "true" is substituted. In the fail case, nothing is substituted for all three
3230 items. */
3231
3232 while (isspace(*s)) s++;
3233 if (*s == '}')
3234 {
3235 if (type[0] == 'i')
3236 {
3237 if (yes && !skipping)
3238 *yieldptr = string_catn(*yieldptr, US"true", 4);
3239 }
3240 else
3241 {
3242 if (yes && lookup_value && !skipping)
3243 *yieldptr = string_cat(*yieldptr, lookup_value);
3244 lookup_value = save_lookup;
3245 }
3246 s++;
3247 goto RETURN;
3248 }
3249
3250 /* The first following string must be braced. */
3251
3252 if (*s++ != '{')
3253 {
3254 errwhere = US"'yes' part did not start with '{'";
3255 goto FAILED_CURLY;
3256 }
3257
3258 /* Expand the first substring. Forced failures are noticed only if we actually
3259 want this string. Set skipping in the call in the fail case (this will always
3260 be the case if we were already skipping). */
3261
3262 sub1 = expand_string_internal(s, TRUE, &s, !yes, TRUE, resetok);
3263 if (sub1 == NULL && (yes || !expand_string_forcedfail)) goto FAILED;
3264 expand_string_forcedfail = FALSE;
3265 if (*s++ != '}')
3266 {
3267 errwhere = US"'yes' part did not end with '}'";
3268 goto FAILED_CURLY;
3269 }
3270
3271 /* If we want the first string, add it to the output */
3272
3273 if (yes)
3274 *yieldptr = string_cat(*yieldptr, sub1);
3275
3276 /* If this is called from a lookup/env or a (cert)extract, we want to restore
3277 $value to what it was at the start of the item, so that it has this value
3278 during the second string expansion. For the call from "if" or "run" to this
3279 function, save_lookup is set to lookup_value, so that this statement does
3280 nothing. */
3281
3282 lookup_value = save_lookup;
3283
3284 /* There now follows either another substring, or "fail", or nothing. This
3285 time, forced failures are noticed only if we want the second string. We must
3286 set skipping in the nested call if we don't want this string, or if we were
3287 already skipping. */
3288
3289 while (isspace(*s)) s++;
3290 if (*s == '{')
3291 {
3292 sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping, TRUE, resetok);
3293 if (sub2 == NULL && (!yes || !expand_string_forcedfail)) goto FAILED;
3294 expand_string_forcedfail = FALSE;
3295 if (*s++ != '}')
3296 {
3297 errwhere = US"'no' part did not start with '{'";
3298 goto FAILED_CURLY;
3299 }
3300
3301 /* If we want the second string, add it to the output */
3302
3303 if (!yes)
3304 *yieldptr = string_cat(*yieldptr, sub2);
3305 }
3306
3307 /* If there is no second string, but the word "fail" is present when the use of
3308 the second string is wanted, set a flag indicating it was a forced failure
3309 rather than a syntactic error. Swallow the terminating } in case this is nested
3310 inside another lookup or if or extract. */
3311
3312 else if (*s != '}')
3313 {
3314 uschar name[256];
3315 /* deconst cast ok here as source is s anyway */
3316 s = US read_name(name, sizeof(name), s, US"_");
3317 if (Ustrcmp(name, "fail") == 0)
3318 {
3319 if (!yes && !skipping)
3320 {
3321 while (isspace(*s)) s++;
3322 if (*s++ != '}')
3323 {
3324 errwhere = US"did not close with '}' after forcedfail";
3325 goto FAILED_CURLY;
3326 }
3327 expand_string_message =
3328 string_sprintf("\"%s\" failed and \"fail\" requested", type);
3329 expand_string_forcedfail = TRUE;
3330 goto FAILED;
3331 }
3332 }
3333 else
3334 {
3335 expand_string_message =
3336 string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type);
3337 goto FAILED;
3338 }
3339 }
3340
3341 /* All we have to do now is to check on the final closing brace. */
3342
3343 while (isspace(*s)) s++;
3344 if (*s++ != '}')
3345 {
3346 errwhere = US"did not close with '}'";
3347 goto FAILED_CURLY;
3348 }
3349
3350
3351 RETURN:
3352 /* Update the input pointer value before returning */
3353 *sptr = s;
3354 return rc;
3355
3356 FAILED_CURLY:
3357 /* Get here if there is a bracketing failure */
3358 expand_string_message = string_sprintf(
3359 "curly-bracket problem in conditional yes/no parsing: %s\n"
3360 " remaining string is '%s'", errwhere, --s);
3361