Fix non-ARC build
[exim.git] / src / src / verify.c
CommitLineData
059ec3d9
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
f9ba5e22 5/* Copyright (c) University of Cambridge 1995 - 2018 */
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6/* See the file NOTICE for conditions of use and distribution. */
7
8/* Functions concerned with verifying things. The original code for callout
9caching was contributed by Kevin Fleming (but I hacked it around a bit). */
10
11
12#include "exim.h"
817d9f57 13#include "transports/smtp.h"
059ec3d9 14
e4bdf652
JH
15#define CUTTHROUGH_CMD_TIMEOUT 30 /* timeout for cutthrough-routing calls */
16#define CUTTHROUGH_DATA_TIMEOUT 60 /* timeout for cutthrough-routing calls */
817d9f57
JH
17static smtp_outblock ctblock;
18uschar ctbuffer[8192];
19
059ec3d9
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20
21/* Structure for caching DNSBL lookups */
22
23typedef struct dnsbl_cache_block {
14b3c5bc 24 time_t expiry;
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25 dns_address *rhs;
26 uschar *text;
27 int rc;
28 BOOL text_set;
29} dnsbl_cache_block;
30
31
32/* Anchor for DNSBL cache */
33
34static tree_node *dnsbl_cache = NULL;
35
36
431b7361
PH
37/* Bits for match_type in one_check_dnsbl() */
38
39#define MT_NOT 1
40#define MT_ALL 2
41
57cc2785 42static uschar cutthrough_response(int, char, uschar **, int);
431b7361 43
8d330698 44
059ec3d9
PH
45
46/*************************************************
47* Retrieve a callout cache record *
48*************************************************/
49
50/* If a record exists, check whether it has expired.
51
52Arguments:
53 dbm_file an open hints file
54 key the record key
55 type "address" or "domain"
56 positive_expire expire time for positive records
57 negative_expire expire time for negative records
58
59Returns: the cache record if a non-expired one exists, else NULL
60*/
61
62static dbdata_callout_cache *
55414b25 63get_callout_cache_record(open_db *dbm_file, const uschar *key, uschar *type,
059ec3d9
PH
64 int positive_expire, int negative_expire)
65{
66BOOL negative;
67int length, expire;
68time_t now;
69dbdata_callout_cache *cache_record;
70
b6323c75 71if (!(cache_record = dbfn_read_with_length(dbm_file, key, &length)))
059ec3d9 72 {
6f4d5ad3 73 HDEBUG(D_verify) debug_printf("callout cache: no %s record found for %s\n", type, key);
059ec3d9
PH
74 return NULL;
75 }
76
77/* We treat a record as "negative" if its result field is not positive, or if
78it is a domain record and the postmaster field is negative. */
79
80negative = cache_record->result != ccache_accept ||
81 (type[0] == 'd' && cache_record->postmaster_result == ccache_reject);
82expire = negative? negative_expire : positive_expire;
83now = time(NULL);
84
85if (now - cache_record->time_stamp > expire)
86 {
6f4d5ad3 87 HDEBUG(D_verify) debug_printf("callout cache: %s record expired for %s\n", type, key);
059ec3d9
PH
88 return NULL;
89 }
90
91/* If this is a non-reject domain record, check for the obsolete format version
92that doesn't have the postmaster and random timestamps, by looking at the
93length. If so, copy it to a new-style block, replicating the record's
94timestamp. Then check the additional timestamps. (There's no point wasting
95effort if connections are rejected.) */
96
97if (type[0] == 'd' && cache_record->result != ccache_reject)
98 {
99 if (length == sizeof(dbdata_callout_cache_obs))
100 {
101 dbdata_callout_cache *new = store_get(sizeof(dbdata_callout_cache));
102 memcpy(new, cache_record, length);
103 new->postmaster_stamp = new->random_stamp = new->time_stamp;
104 cache_record = new;
105 }
106
107 if (now - cache_record->postmaster_stamp > expire)
108 cache_record->postmaster_result = ccache_unknown;
109
110 if (now - cache_record->random_stamp > expire)
111 cache_record->random_result = ccache_unknown;
112 }
113
6f4d5ad3 114HDEBUG(D_verify) debug_printf("callout cache: found %s record for %s\n", type, key);
059ec3d9
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115return cache_record;
116}
117
118
119
707ee5b1
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120/* Check the callout cache.
121Options * pm_mailfrom may be modified by cache partial results.
059ec3d9 122
707ee5b1 123Return: TRUE if result found
059ec3d9
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124*/
125
707ee5b1
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126static BOOL
127cached_callout_lookup(address_item * addr, uschar * address_key,
128 uschar * from_address, int * opt_ptr, uschar ** pm_ptr,
129 int * yield, uschar ** failure_ptr,
130 dbdata_callout_cache * new_domain_record, int * old_domain_res)
059ec3d9 131{
707ee5b1 132int options = *opt_ptr;
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133open_db dbblock;
134open_db *dbm_file = NULL;
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135
136/* Open the callout cache database, it it exists, for reading only at this
137stage, unless caching has been disabled. */
138
8b9476ba 139if (options & vopt_callout_no_cache)
059ec3d9
PH
140 {
141 HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n");
142 }
707ee5b1 143else if (!(dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE)))
059ec3d9
PH
144 {
145 HDEBUG(D_verify) debug_printf("callout cache: not available\n");
146 }
707ee5b1 147else
059ec3d9 148 {
707ee5b1
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149 /* If a cache database is available see if we can avoid the need to do an
150 actual callout by making use of previously-obtained data. */
151
152 dbdata_callout_cache_address * cache_address_record;
153 dbdata_callout_cache * cache_record = get_callout_cache_record(dbm_file,
154 addr->domain, US"domain",
155 callout_cache_domain_positive_expire, callout_cache_domain_negative_expire);
059ec3d9
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156
157 /* If an unexpired cache record was found for this domain, see if the callout
158 process can be short-circuited. */
159
ff5929e3 160 if (cache_record)
059ec3d9 161 {
2b1c6e3a
PH
162 /* In most cases, if an early command (up to and including MAIL FROM:<>)
163 was rejected, there is no point carrying on. The callout fails. However, if
164 we are doing a recipient verification with use_sender or use_postmaster
165 set, a previous failure of MAIL FROM:<> doesn't count, because this time we
166 will be using a non-empty sender. We have to remember this situation so as
167 not to disturb the cached domain value if this whole verification succeeds
168 (we don't want it turning into "accept"). */
169
707ee5b1 170 *old_domain_res = cache_record->result;
2b1c6e3a 171
707ee5b1
JH
172 if ( cache_record->result == ccache_reject
173 || *from_address == 0 && cache_record->result == ccache_reject_mfnull)
059ec3d9
PH
174 {
175 setflag(addr, af_verify_nsfail);
176 HDEBUG(D_verify)
707ee5b1
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177 debug_printf("callout cache: domain gave initial rejection, or "
178 "does not accept HELO or MAIL FROM:<>\n");
059ec3d9
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179 setflag(addr, af_verify_nsfail);
180 addr->user_message = US"(result of an earlier callout reused).";
707ee5b1 181 *yield = FAIL;
8e669ac1 182 *failure_ptr = US"mail";
707ee5b1
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183 dbfn_close(dbm_file);
184 return TRUE;
059ec3d9
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185 }
186
187 /* If a previous check on a "random" local part was accepted, we assume
188 that the server does not do any checking on local parts. There is therefore
189 no point in doing the callout, because it will always be successful. If a
190 random check previously failed, arrange not to do it again, but preserve
191 the data in the new record. If a random check is required but hasn't been
192 done, skip the remaining cache processing. */
193
8b9476ba 194 if (options & vopt_callout_random) switch(cache_record->random_result)
059ec3d9
PH
195 {
196 case ccache_accept:
8b9476ba
JH
197 HDEBUG(D_verify)
198 debug_printf("callout cache: domain accepts random addresses\n");
707ee5b1
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199 dbfn_close(dbm_file);
200 return TRUE; /* Default yield is OK */
059ec3d9
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201
202 case ccache_reject:
8b9476ba
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203 HDEBUG(D_verify)
204 debug_printf("callout cache: domain rejects random addresses\n");
707ee5b1
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205 *opt_ptr = options & ~vopt_callout_random;
206 new_domain_record->random_result = ccache_reject;
207 new_domain_record->random_stamp = cache_record->random_stamp;
8b9476ba 208 break;
059ec3d9
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209
210 default:
8b9476ba
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211 HDEBUG(D_verify)
212 debug_printf("callout cache: need to check random address handling "
213 "(not cached or cache expired)\n");
707ee5b1
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214 dbfn_close(dbm_file);
215 return FALSE;
059ec3d9
PH
216 }
217
218 /* If a postmaster check is requested, but there was a previous failure,
219 there is again no point in carrying on. If a postmaster check is required,
220 but has not been done before, we are going to have to do a callout, so skip
221 remaining cache processing. */
222
707ee5b1 223 if (*pm_ptr)
059ec3d9
PH
224 {
225 if (cache_record->postmaster_result == ccache_reject)
707ee5b1
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226 {
227 setflag(addr, af_verify_pmfail);
228 HDEBUG(D_verify)
229 debug_printf("callout cache: domain does not accept "
230 "RCPT TO:<postmaster@domain>\n");
231 *yield = FAIL;
232 *failure_ptr = US"postmaster";
233 setflag(addr, af_verify_pmfail);
234 addr->user_message = US"(result of earlier verification reused).";
235 dbfn_close(dbm_file);
236 return TRUE;
237 }
059ec3d9 238 if (cache_record->postmaster_result == ccache_unknown)
707ee5b1
JH
239 {
240 HDEBUG(D_verify)
241 debug_printf("callout cache: need to check RCPT "
242 "TO:<postmaster@domain> (not cached or cache expired)\n");
243 dbfn_close(dbm_file);
244 return FALSE;
245 }
059ec3d9
PH
246
247 /* If cache says OK, set pm_mailfrom NULL to prevent a redundant
248 postmaster check if the address itself has to be checked. Also ensure
249 that the value in the cache record is preserved (with its old timestamp).
250 */
251
252 HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT "
707ee5b1
JH
253 "TO:<postmaster@domain>\n");
254 *pm_ptr = NULL;
255 new_domain_record->postmaster_result = ccache_accept;
256 new_domain_record->postmaster_stamp = cache_record->postmaster_stamp;
059ec3d9
PH
257 }
258 }
259
260 /* We can't give a result based on information about the domain. See if there
261 is an unexpired cache record for this specific address (combined with the
262 sender address if we are doing a recipient callout with a non-empty sender).
263 */
264
707ee5b1
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265 if (!(cache_address_record = (dbdata_callout_cache_address *)
266 get_callout_cache_record(dbm_file, address_key, US"address",
267 callout_cache_positive_expire, callout_cache_negative_expire)))
268 {
269 dbfn_close(dbm_file);
270 return FALSE;
271 }
059ec3d9 272
707ee5b1 273 if (cache_address_record->result == ccache_accept)
059ec3d9 274 {
707ee5b1
JH
275 HDEBUG(D_verify)
276 debug_printf("callout cache: address record is positive\n");
277 }
278 else
279 {
280 HDEBUG(D_verify)
281 debug_printf("callout cache: address record is negative\n");
282 addr->user_message = US"Previous (cached) callout verification failure";
283 *failure_ptr = US"recipient";
284 *yield = FAIL;
059ec3d9
PH
285 }
286
287 /* Close the cache database while we actually do the callout for real. */
288
059ec3d9 289 dbfn_close(dbm_file);
707ee5b1
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290 return TRUE;
291 }
292return FALSE;
293}
294
295
296/* Write results to callout cache
297*/
298static void
299cache_callout_write(dbdata_callout_cache * dom_rec, const uschar * domain,
300 int done, dbdata_callout_cache_address * addr_rec, uschar * address_key)
301{
302open_db dbblock;
303open_db *dbm_file = NULL;
304
305/* If we get here with done == TRUE, a successful callout happened, and yield
306will be set OK or FAIL according to the response to the RCPT command.
307Otherwise, we looped through the hosts but couldn't complete the business.
308However, there may be domain-specific information to cache in both cases.
309
310The value of the result field in the new_domain record is ccache_unknown if
311there was an error before or with MAIL FROM:, and errno was not zero,
312implying some kind of I/O error. We don't want to write the cache in that case.
313Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
314
315if (dom_rec->result != ccache_unknown)
316 if (!(dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE)))
317 {
318 HDEBUG(D_verify) debug_printf("callout cache: not available\n");
319 }
320 else
321 {
322 (void)dbfn_write(dbm_file, domain, dom_rec,
323 (int)sizeof(dbdata_callout_cache));
324 HDEBUG(D_verify) debug_printf("wrote callout cache domain record for %s:\n"
325 " result=%d postmaster=%d random=%d\n",
326 domain,
327 dom_rec->result,
328 dom_rec->postmaster_result,
329 dom_rec->random_result);
330 }
331
332/* If a definite result was obtained for the callout, cache it unless caching
333is disabled. */
334
335if (done && addr_rec->result != ccache_unknown)
336 {
337 if (!dbm_file)
338 dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE);
339 if (!dbm_file)
340 {
341 HDEBUG(D_verify) debug_printf("no callout cache available\n");
342 }
343 else
344 {
345 (void)dbfn_write(dbm_file, address_key, addr_rec,
346 (int)sizeof(dbdata_callout_cache_address));
347 HDEBUG(D_verify) debug_printf("wrote %s callout cache address record for %s\n",
348 addr_rec->result == ccache_accept ? "positive" : "negative",
349 address_key);
350 }
351 }
352
353if (dbm_file) dbfn_close(dbm_file);
354}
355
356
c4c940fd
JH
357/* Cutthrough-multi. If the existing cached cutthrough connection matches
358the one we would make for a subsequent recipient, use it. Send the RCPT TO
359and check the result, nonpipelined as it may be wanted immediately for
360recipient-verification.
361
362It seems simpler to deal with this case separately from the main callout loop.
363We will need to remember it has sent, or not, so that rcpt-acl tail code
364can do it there for the non-rcpt-verify case. For this we keep an addresscount.
365
366Return: TRUE for a definitive result for the recipient
367*/
368static int
369cutthrough_multi(address_item * addr, host_item * host_list,
370 transport_feedback * tf, int * yield)
371{
372BOOL done = FALSE;
373host_item * host;
374
375if (addr->transport == cutthrough.addr.transport)
376 for (host = host_list; host; host = host->next)
377 if (Ustrcmp(host->address, cutthrough.host.address) == 0)
378 {
379 int host_af;
380 uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
381 int port = 25;
382
383 deliver_host = host->name;
384 deliver_host_address = host->address;
385 deliver_host_port = host->port;
386 deliver_domain = addr->domain;
387 transport_name = addr->transport->name;
388
57cc2785 389 host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
c4c940fd 390
f83a760f
JH
391 if ( !smtp_get_interface(tf->interface, host_af, addr, &interface,
392 US"callout")
393 || !smtp_get_port(tf->port, addr, &port, US"callout")
394 )
c4c940fd
JH
395 log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
396 addr->message);
397
f83a760f
JH
398 smtp_port_for_connect(host, port);
399
c4c940fd
JH
400 if ( ( interface == cutthrough.interface
401 || ( interface
402 && cutthrough.interface
403 && Ustrcmp(interface, cutthrough.interface) == 0
404 ) )
f83a760f 405 && host->port == cutthrough.host.port
c4c940fd
JH
406 )
407 {
408 uschar * resp = NULL;
409
410 /* Match! Send the RCPT TO, set done from the response */
411 done =
4e910c01 412 smtp_write_command(&ctblock, SCMD_FLUSH, "RCPT TO:<%.1000s>\r\n",
c4c940fd
JH
413 transport_rcpt_address(addr,
414 addr->transport->rcpt_include_affixes)) >= 0 &&
57cc2785 415 cutthrough_response(cutthrough.fd, '2', &resp, CUTTHROUGH_DATA_TIMEOUT) == '2';
c4c940fd
JH
416
417 /* This would go horribly wrong if a callout fail was ignored by ACL.
418 We punt by abandoning cutthrough on a reject, like the
419 first-rcpt does. */
420
421 if (done)
422 {
423 address_item * na = store_get(sizeof(address_item));
424 *na = cutthrough.addr;
425 cutthrough.addr = *addr;
426 cutthrough.addr.host_used = &cutthrough.host;
427 cutthrough.addr.next = na;
428
429 cutthrough.nrcpt++;
430 }
431 else
432 {
57cc2785 433 cancel_cutthrough_connection(TRUE, US"recipient rejected");
c4c940fd
JH
434 if (!resp || errno == ETIMEDOUT)
435 {
436 HDEBUG(D_verify) debug_printf("SMTP timeout\n");
437 }
438 else if (errno == 0)
439 {
440 if (*resp == 0)
441 Ustrcpy(resp, US"connection dropped");
442
443 addr->message =
e9166683
JH
444 string_sprintf("response to \"%s\" was: %s",
445 big_buffer, string_printing(resp));
c4c940fd
JH
446
447 addr->user_message =
448 string_sprintf("Callout verification failed:\n%s", resp);
449
450 /* Hard rejection ends the process */
451
452 if (resp[0] == '5') /* Address rejected */
453 {
454 *yield = FAIL;
455 done = TRUE;
456 }
457 }
458 }
459 }
460 break; /* host_list */
461 }
462if (!done)
57cc2785 463 cancel_cutthrough_connection(TRUE, US"incompatible connection");
c4c940fd
JH
464return done;
465}
466
467
707ee5b1
JH
468/*************************************************
469* Do callout verification for an address *
470*************************************************/
471
472/* This function is called from verify_address() when the address has routed to
473a host list, and a callout has been requested. Callouts are expensive; that is
474why a cache is used to improve the efficiency.
475
476Arguments:
477 addr the address that's been routed
478 host_list the list of hosts to try
479 tf the transport feedback block
480
481 ifstring "interface" option from transport, or NULL
482 portstring "port" option from transport, or NULL
483 protocolstring "protocol" option from transport, or NULL
484 callout the per-command callout timeout
485 callout_overall the overall callout timeout (if < 0 use 4*callout)
486 callout_connect the callout connection timeout (if < 0 use callout)
487 options the verification options - these bits are used:
488 vopt_is_recipient => this is a recipient address
489 vopt_callout_no_cache => don't use callout cache
490 vopt_callout_fullpm => if postmaster check, do full one
491 vopt_callout_random => do the "random" thing
492 vopt_callout_recipsender => use real sender for recipient
493 vopt_callout_recippmaster => use postmaster for recipient
57cc2785 494 vopt_callout_hold => lazy close connection
707ee5b1
JH
495 se_mailfrom MAIL FROM address for sender verify; NULL => ""
496 pm_mailfrom if non-NULL, do the postmaster check with this sender
497
498Returns: OK/FAIL/DEFER
499*/
500
501static int
502do_callout(address_item *addr, host_item *host_list, transport_feedback *tf,
503 int callout, int callout_overall, int callout_connect, int options,
504 uschar *se_mailfrom, uschar *pm_mailfrom)
505{
506int yield = OK;
507int old_domain_cache_result = ccache_accept;
508BOOL done = FALSE;
509uschar *address_key;
510uschar *from_address;
511uschar *random_local_part = NULL;
512const uschar *save_deliver_domain = deliver_domain;
513uschar **failure_ptr = options & vopt_is_recipient
514 ? &recipient_verify_failure : &sender_verify_failure;
515dbdata_callout_cache new_domain_record;
516dbdata_callout_cache_address new_address_record;
707ee5b1
JH
517time_t callout_start_time;
518
519new_domain_record.result = ccache_unknown;
520new_domain_record.postmaster_result = ccache_unknown;
521new_domain_record.random_result = ccache_unknown;
522
523memset(&new_address_record, 0, sizeof(new_address_record));
524
525/* For a recipient callout, the key used for the address cache record must
526include the sender address if we are using the real sender in the callout,
527because that may influence the result of the callout. */
528
529if (options & vopt_is_recipient)
530 if (options & vopt_callout_recipsender)
531 {
532 from_address = sender_address;
533 address_key = string_sprintf("%s/<%s>", addr->address, sender_address);
534 if (cutthrough.delivery) options |= vopt_callout_no_cache;
535 }
536 else if (options & vopt_callout_recippmaster)
537 {
538 from_address = string_sprintf("postmaster@%s", qualify_domain_sender);
539 address_key = string_sprintf("%s/<postmaster@%s>", addr->address,
540 qualify_domain_sender);
541 }
542 else
543 {
544 from_address = US"";
545 address_key = addr->address;
546 }
547
548/* For a sender callout, we must adjust the key if the mailfrom address is not
549empty. */
550
551else
552 {
553 from_address = se_mailfrom ? se_mailfrom : US"";
554 address_key = *from_address
555 ? string_sprintf("%s/<%s>", addr->address, from_address) : addr->address;
059ec3d9
PH
556 }
557
707ee5b1
JH
558if (cached_callout_lookup(addr, address_key, from_address,
559 &options, &pm_mailfrom, &yield, failure_ptr,
560 &new_domain_record, &old_domain_cache_result))
57cc2785
JH
561 {
562 cancel_cutthrough_connection(TRUE, US"cache-hit");
707ee5b1 563 goto END_CALLOUT;
57cc2785 564 }
707ee5b1 565
193e3acd 566if (!addr->transport)
059ec3d9 567 {
193e3acd 568 HDEBUG(D_verify) debug_printf("cannot callout via null transport\n");
059ec3d9 569 }
6681531a
HSHR
570else if (Ustrcmp(addr->transport->driver_name, "smtp") != 0)
571 log_write(0, LOG_MAIN|LOG_PANIC|LOG_CONFIG_FOR, "callout transport '%s': %s is non-smtp",
572 addr->transport->name, addr->transport->driver_name);
193e3acd
JH
573else
574 {
575 smtp_transport_options_block *ob =
9d9c3746 576 (smtp_transport_options_block *)addr->transport->options_block;
c4c940fd 577 host_item * host;
059ec3d9 578
193e3acd
JH
579 /* The information wasn't available in the cache, so we have to do a real
580 callout and save the result in the cache for next time, unless no_cache is set,
581 or unless we have a previously cached negative random result. If we are to test
582 with a random local part, ensure that such a local part is available. If not,
4c04137d 583 log the fact, but carry on without randomising. */
059ec3d9 584
707ee5b1 585 if (options & vopt_callout_random && callout_random_local_part)
65f1c92a 586 if (!(random_local_part = expand_string(callout_random_local_part)))
193e3acd
JH
587 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand "
588 "callout_random_local_part: %s", expand_string_message);
059ec3d9 589
193e3acd
JH
590 /* Default the connect and overall callout timeouts if not set, and record the
591 time we are starting so that we can enforce it. */
4c590bd1 592
193e3acd
JH
593 if (callout_overall < 0) callout_overall = 4 * callout;
594 if (callout_connect < 0) callout_connect = callout;
595 callout_start_time = time(NULL);
4c590bd1 596
193e3acd
JH
597 /* Before doing a real callout, if this is an SMTP connection, flush the SMTP
598 output because a callout might take some time. When PIPELINING is active and
599 there are many recipients, the total time for doing lots of callouts can add up
600 and cause the client to time out. So in this case we forgo the PIPELINING
601 optimization. */
817d9f57 602
ff5929e3 603 if (smtp_out && !disable_callout_flush) mac_smtp_fflush();
059ec3d9 604
c4c940fd
JH
605 clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
606 clearflag(addr, af_verify_nsfail); /* null sender callout flag */
607
5032d1cf
JH
608/* cutthrough-multi: if a nonfirst rcpt has the same routing as the first,
609and we are holding a cutthrough conn open, we can just append the rcpt to
610that conn for verification purposes (and later delivery also). Simplest
c4c940fd 611coding means skipping this whole loop and doing the append separately. */
5032d1cf
JH
612
613 /* Can we re-use an open cutthrough connection? */
614 if ( cutthrough.fd >= 0
615 && (options & (vopt_callout_recipsender | vopt_callout_recippmaster))
616 == vopt_callout_recipsender
617 && !random_local_part
618 && !pm_mailfrom
619 )
c4c940fd 620 done = cutthrough_multi(addr, host_list, tf, &yield);
5032d1cf 621
c4c940fd
JH
622 /* If we did not use a cached connection, make connections to the hosts
623 and do real callouts. The list of hosts is passed in as an argument. */
059ec3d9 624
ff5929e3 625 for (host = host_list; host && !done; host = host->next)
059ec3d9 626 {
193e3acd
JH
627 int host_af;
628 int port = 25;
193e3acd 629 uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
02b41d71 630 smtp_context sx;
193e3acd 631
ff5929e3 632 if (!host->address)
193e3acd
JH
633 {
634 DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
635 host->name);
636 continue;
637 }
059ec3d9 638
193e3acd 639 /* Check the overall callout timeout */
059ec3d9 640
193e3acd
JH
641 if (time(NULL) - callout_start_time >= callout_overall)
642 {
643 HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
644 break;
645 }
059ec3d9 646
193e3acd 647 /* Set IPv4 or IPv6 */
059ec3d9 648
e9166683 649 host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
de3a88fb 650
193e3acd
JH
651 /* Expand and interpret the interface and port strings. The latter will not
652 be used if there is a host-specific port (e.g. from a manualroute router).
653 This has to be delayed till now, because they may expand differently for
654 different hosts. If there's a failure, log it, but carry on with the
655 defaults. */
de3a88fb 656
193e3acd
JH
657 deliver_host = host->name;
658 deliver_host_address = host->address;
a7538db1 659 deliver_host_port = host->port;
193e3acd 660 deliver_domain = addr->domain;
aec45841 661 transport_name = addr->transport->name;
059ec3d9 662
6f6dedcc 663 if ( !smtp_get_interface(tf->interface, host_af, addr, &interface,
bf7aabb4
JH
664 US"callout")
665 || !smtp_get_port(tf->port, addr, &port, US"callout")
666 )
193e3acd
JH
667 log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
668 addr->message);
059ec3d9 669
02b41d71
JH
670 sx.addrlist = addr;
671 sx.host = host;
672 sx.host_af = host_af,
673 sx.port = port;
674 sx.interface = interface;
675 sx.helo_data = tf->helo_data;
676 sx.tblock = addr->transport;
e9166683 677 sx.verify = TRUE;
02b41d71
JH
678
679tls_retry_connection:
680 /* Set the address state so that errors are recorded in it */
681
682 addr->transport_return = PENDING_DEFER;
683 ob->connect_timeout = callout_connect;
684 ob->command_timeout = callout;
685
686 /* Get the channel set up ready for a message (MAIL FROM being the next
687 SMTP command to send. If we tried TLS but it failed, try again without
688 if permitted */
689
f10e3ea3
JH
690 yield = smtp_setup_conn(&sx, FALSE);
691#ifdef SUPPORT_TLS
692 if ( yield == DEFER
02b41d71
JH
693 && addr->basic_errno == ERRNO_TLSFAILURE
694 && ob->tls_tempfail_tryclear
695 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
696 )
193e3acd 697 {
cf0c6164
JH
698 log_write(0, LOG_MAIN,
699 "%s: callout unencrypted to %s [%s] (not in hosts_require_tls)",
700 addr->message, host->name, host->address);
e9166683
JH
701 addr->transport_return = PENDING_DEFER;
702 yield = smtp_setup_conn(&sx, TRUE);
02b41d71 703 }
f10e3ea3 704#endif
02b41d71
JH
705 if (yield != OK)
706 {
02b41d71 707 errno = addr->basic_errno;
aec45841 708 transport_name = NULL;
193e3acd
JH
709 deliver_host = deliver_host_address = NULL;
710 deliver_domain = save_deliver_domain;
bf7aabb4 711
02b41d71
JH
712 /* Failure to accept HELO is cached; this blocks the whole domain for all
713 senders. I/O errors and defer responses are not cached. */
770747fd 714
02b41d71 715 if (yield == FAIL && (errno == 0 || errno == ERRNO_SMTPCLOSED))
a7538db1 716 {
02b41d71
JH
717 setflag(addr, af_verify_nsfail);
718 new_domain_record.result = ccache_reject;
719 done = TRUE;
a7538db1 720 }
193e3acd 721 else
02b41d71
JH
722 done = FALSE;
723 goto no_conn;
3c8b3577 724 }
9bfc60eb 725
02b41d71
JH
726 /* If we needed to authenticate, smtp_setup_conn() did that. Copy
727 the AUTH info for logging */
fcc8e047 728
02b41d71
JH
729 addr->authenticator = client_authenticator;
730 addr->auth_id = client_authenticated_id;
b4a2b536 731
e9166683
JH
732 sx.from_addr = from_address;
733 sx.first_addr = sx.sync_addr = addr;
734 sx.ok = FALSE; /*XXX these 3 last might not be needed for verify? */
735 sx.send_rset = TRUE;
736 sx.completed_addr = FALSE;
b4a2b536 737
cf0c6164 738 new_domain_record.result = old_domain_cache_result == ccache_reject_mfnull
e9166683 739 ? ccache_reject_mfnull : ccache_accept;
c4c940fd 740
e9166683
JH
741 /* Do the random local part check first. Temporarily replace the recipient
742 with the "random" value */
02b41d71 743
e9166683 744 if (random_local_part)
059ec3d9 745 {
e9166683 746 uschar * main_address = addr->address;
921dfc11
JH
747 const uschar * rcpt_domain = addr->domain;
748
8c5d388a 749#ifdef SUPPORT_I18N
921dfc11
JH
750 uschar * errstr = NULL;
751 if ( testflag(addr, af_utf8_downcvt)
752 && (rcpt_domain = string_domain_utf8_to_alabel(rcpt_domain,
753 &errstr), errstr)
754 )
755 {
756 addr->message = errstr;
757 errno = ERRNO_EXPANDFAIL;
758 setflag(addr, af_verify_nsfail);
759 done = FALSE;
760 rcpt_domain = US""; /*XXX errorhandling! */
761 }
762#endif
763
57cc2785
JH
764 /* This would be ok for 1st rcpt of a cutthrough (the case handled here;
765 subsequents are done in cutthrough_multi()), but no way to
766 handle a subsequent because of the RSET vaporising the MAIL FROM.
767 So refuse to support any. Most cutthrough use will not involve
768 random_local_part, so no loss. */
769 cancel_cutthrough_connection(TRUE, US"random-recipient");
059ec3d9 770
e9166683
JH
771 addr->address = string_sprintf("%s@%.1000s",
772 random_local_part, rcpt_domain);
773 done = FALSE;
902fbd69
JH
774
775 /* If accepted, we aren't going to do any further tests below.
776 Otherwise, cache a real negative response, and get back to the right
777 state to send RCPT. Unless there's some problem such as a dropped
778 connection, we expect to succeed, because the commands succeeded above.
779 However, some servers drop the connection after responding to an
780 invalid recipient, so on (any) error we drop and remake the connection.
781 XXX We don't care about that for postmaster_full. Should we?
782
783 XXX could we add another flag to the context, and have the common
784 code emit the RSET too? Even pipelined after the RCPT...
785 Then the main-verify call could use it if there's to be a subsequent
786 postmaster-verify.
787 The sync_responses() would need to be taught about it and we'd
788 need another return code filtering out to here.
14de8063
JH
789
790 Avoid using a SIZE option on the MAIL for all randon-rcpt checks.
902fbd69
JH
791 */
792
14de8063
JH
793 sx.avoid_option = OPTION_SIZE;
794
a65c4156
JH
795 /* Remember when we last did a random test */
796 new_domain_record.random_stamp = time(NULL);
797
e9166683
JH
798 if (smtp_write_mail_and_rcpt_cmds(&sx, &yield) == 0)
799 switch(addr->transport_return)
800 {
b6323c75 801 case PENDING_OK: /* random was accepted, unfortunately */
e9166683 802 new_domain_record.random_result = ccache_accept;
b6323c75 803 yield = OK; /* Only usable verify result we can return */
fae8970d
JH
804 done = TRUE;
805 goto no_conn;
b6323c75 806 case FAIL: /* rejected: the preferred result */
e9166683 807 new_domain_record.random_result = ccache_reject;
14de8063 808 sx.avoid_option = 0;
193e3acd 809
e9166683 810 /* Between each check, issue RSET, because some servers accept only
902fbd69
JH
811 one recipient after MAIL FROM:<>.
812 XXX We don't care about that for postmaster_full. Should we? */
193e3acd 813
e9166683 814 if ((done =
4e910c01 815 smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0 &&
e9166683
JH
816 smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
817 '2', callout)))
818 break;
65f1c92a 819
65f1c92a 820 HDEBUG(D_acl|D_v)
e1d04f48 821 debug_printf_indent("problem after random/rset/mfrom; reopen conn\n");
65f1c92a
JH
822 random_local_part = NULL;
823#ifdef SUPPORT_TLS
dec766a1 824 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
65f1c92a 825#endif
e1d04f48 826 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
02b41d71 827 (void)close(sx.inblock.sock);
e9166683 828 sx.inblock.sock = sx.outblock.sock = -1;
0cbf2b82 829#ifndef DISABLE_EVENT
65f1c92a
JH
830 (void) event_raise(addr->transport->event_action,
831 US"tcp:close", NULL);
832#endif
a65c4156
JH
833 addr->address = main_address;
834 addr->transport_return = PENDING_DEFER;
835 sx.first_addr = sx.sync_addr = addr;
836 sx.ok = FALSE;
837 sx.send_rset = TRUE;
838 sx.completed_addr = FALSE;
65f1c92a 839 goto tls_retry_connection;
b6323c75
JH
840 case DEFER: /* 4xx response to random */
841 break; /* Just to be clear. ccache_unknown, !done. */
e9166683 842 }
059ec3d9 843
e9166683
JH
844 /* Re-setup for main verify, or for the error message when failing */
845 addr->address = main_address;
846 addr->transport_return = PENDING_DEFER;
847 sx.first_addr = sx.sync_addr = addr;
848 sx.ok = FALSE;
849 sx.send_rset = TRUE;
850 sx.completed_addr = FALSE;
851 }
852 else
853 done = TRUE;
921dfc11 854
14de8063
JH
855 /* Main verify. For rcpt-verify use SIZE if we know it and we're not cacheing;
856 for sndr-verify never use it. */
e9166683
JH
857
858 if (done)
859 {
14de8063
JH
860 if (!(options & vopt_is_recipient && options & vopt_callout_no_cache))
861 sx.avoid_option = OPTION_SIZE;
862
e9166683
JH
863 done = FALSE;
864 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
865 {
866 case 0: switch(addr->transport_return) /* ok so far */
867 {
868 case PENDING_OK: done = TRUE;
869 new_address_record.result = ccache_accept;
870 break;
14de8063 871 case FAIL: done = TRUE;
e9166683
JH
872 yield = FAIL;
873 *failure_ptr = US"recipient";
874 new_address_record.result = ccache_reject;
875 break;
14de8063 876 default: break;
e9166683
JH
877 }
878 break;
879
880 case -1: /* MAIL response error */
881 *failure_ptr = US"mail";
882 if (errno == 0 && sx.buffer[0] == '5')
883 {
884 setflag(addr, af_verify_nsfail);
885 if (from_address[0] == 0)
886 new_domain_record.result = ccache_reject_mfnull;
887 }
888 break;
889 /* non-MAIL read i/o error */
890 /* non-MAIL response timeout */
891 /* internal error; channel still usable */
892 default: break; /* transmit failed */
893 }
894 }
895
896 addr->auth_sndr = client_authenticated_sender;
897
898 deliver_host = deliver_host_address = NULL;
899 deliver_domain = save_deliver_domain;
900
901 /* Do postmaster check if requested; if a full check is required, we
902 check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
903
904 if (done && pm_mailfrom)
905 {
906 /* Could possibly shift before main verify, just above, and be ok
907 for cutthrough. But no way to handle a subsequent rcpt, so just
908 refuse any */
57cc2785 909 cancel_cutthrough_connection(TRUE, US"postmaster verify");
e1d04f48 910 HDEBUG(D_acl|D_v) debug_printf_indent("Cutthrough cancelled by presence of postmaster verify\n");
e9166683 911
4e910c01 912 done = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0
e9166683
JH
913 && smtp_read_response(&sx.inblock, sx.buffer,
914 sizeof(sx.buffer), '2', callout);
915
916 if (done)
917 {
918 uschar * main_address = addr->address;
919
920 /*XXX oops, affixes */
921 addr->address = string_sprintf("postmaster@%.1000s", addr->domain);
922 addr->transport_return = PENDING_DEFER;
923
924 sx.from_addr = pm_mailfrom;
925 sx.first_addr = sx.sync_addr = addr;
926 sx.ok = FALSE;
927 sx.send_rset = TRUE;
928 sx.completed_addr = FALSE;
14de8063 929 sx.avoid_option = OPTION_SIZE;
e9166683
JH
930
931 if( smtp_write_mail_and_rcpt_cmds(&sx, &yield) == 0
932 && addr->transport_return == PENDING_OK
933 )
934 done = TRUE;
921dfc11 935 else
e9166683 936 done = (options & vopt_callout_fullpm) != 0
4e910c01 937 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
e9166683
JH
938 "RCPT TO:<postmaster>\r\n") >= 0
939 && smtp_read_response(&sx.inblock, sx.buffer,
940 sizeof(sx.buffer), '2', callout);
921dfc11 941
e9166683 942 /* Sort out the cache record */
2a4be8f9 943
e9166683
JH
944 new_domain_record.postmaster_stamp = time(NULL);
945
946 if (done)
947 new_domain_record.postmaster_result = ccache_accept;
948 else if (errno == 0 && sx.buffer[0] == '5')
949 {
950 *failure_ptr = US"postmaster";
951 setflag(addr, af_verify_pmfail);
952 new_domain_record.postmaster_result = ccache_reject;
953 }
954
955 addr->address = main_address;
956 }
957 }
193e3acd
JH
958 /* For any failure of the main check, other than a negative response, we just
959 close the connection and carry on. We can identify a negative response by the
960 fact that errno is zero. For I/O errors it will be non-zero
2a4be8f9 961
193e3acd
JH
962 Set up different error texts for logging and for sending back to the caller
963 as an SMTP response. Log in all cases, using a one-line format. For sender
964 callouts, give a full response to the caller, but for recipient callouts,
965 don't give the IP address because this may be an internal host whose identity
966 is not to be widely broadcast. */
2a4be8f9 967
02b41d71 968no_conn:
e9166683 969 switch(errno)
193e3acd 970 {
02b41d71
JH
971 case ETIMEDOUT:
972 HDEBUG(D_verify) debug_printf("SMTP timeout\n");
973 sx.send_quit = FALSE;
974 break;
975
8c5d388a 976#ifdef SUPPORT_I18N
02b41d71 977 case ERRNO_UTF8_FWD:
9bfc60eb
JH
978 {
979 extern int acl_where; /* src/acl.c */
980 errno = 0;
981 addr->message = string_sprintf(
e9166683 982 "response to \"EHLO\" did not include SMTPUTF8");
02b41d71
JH
983 addr->user_message = acl_where == ACL_WHERE_RCPT
984 ? US"533 no support for internationalised mailbox name"
9bfc60eb
JH
985 : US"550 mailbox unavailable";
986 yield = FAIL;
987 done = TRUE;
988 }
02b41d71 989 break;
9bfc60eb 990#endif
02b41d71
JH
991 case ECONNREFUSED:
992 sx.send_quit = FALSE;
993 break;
2a4be8f9 994
02b41d71 995 case 0:
e9166683 996 if (*sx.buffer == 0) Ustrcpy(sx.buffer, US"connection dropped");
059ec3d9 997
e9166683 998 /*XXX test here is ugly; seem to have a split of responsibility for
b6323c75 999 building this message. Need to rationalise. Where is it done
e9166683
JH
1000 before here, and when not?
1001 Not == 5xx resp to MAIL on main-verify
1002 */
1003 if (!addr->message) addr->message =
1004 string_sprintf("response to \"%s\" was: %s",
1005 big_buffer, string_printing(sx.buffer));
02b41d71
JH
1006
1007 addr->user_message = options & vopt_is_recipient
e9166683 1008 ? string_sprintf("Callout verification failed:\n%s", sx.buffer)
02b41d71 1009 : string_sprintf("Called: %s\nSent: %s\nResponse: %s",
e9166683 1010 host->address, big_buffer, sx.buffer);
059ec3d9 1011
02b41d71 1012 /* Hard rejection ends the process */
193e3acd 1013
e9166683 1014 if (sx.buffer[0] == '5') /* Address rejected */
02b41d71
JH
1015 {
1016 yield = FAIL;
1017 done = TRUE;
1018 }
1019 break;
193e3acd 1020 }
059ec3d9 1021
193e3acd
JH
1022 /* End the SMTP conversation and close the connection. */
1023
4c04137d 1024 /* Cutthrough - on a successful connect and recipient-verify with
5032d1cf 1025 use-sender and we are 1st rcpt and have no cutthrough conn so far
57cc2785
JH
1026 here is where we want to leave the conn open. Ditto for a lazy-close
1027 verify. */
1028
857eaf37
JH
1029 if (cutthrough.delivery)
1030 {
1031 if (addr->transport->filter_command)
1032 {
1033 cutthrough.delivery= FALSE;
1034 HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of transport filter\n");
1035 }
72cb765f
JH
1036#ifndef DISABLE_DKIM
1037 if (ob->dkim.dkim_domain)
857eaf37
JH
1038 {
1039 cutthrough.delivery= FALSE;
72cb765f 1040 HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of DKIM signing\n");
857eaf37 1041 }
72cb765f
JH
1042#endif
1043#ifdef EXPERIMENTAL_ARC
1044 if (ob->arc_sign)
1045 {
1046 cutthrough.delivery= FALSE;
1047 HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of ARC signing\n");
1048 }
1049#endif
857eaf37
JH
1050 }
1051
57cc2785 1052 if ( (cutthrough.delivery || options & vopt_callout_hold)
5032d1cf 1053 && rcpt_count == 1
193e3acd
JH
1054 && done
1055 && yield == OK
98c82a3d
JH
1056 && (options & (vopt_callout_recipsender|vopt_callout_recippmaster|vopt_success_on_redirect))
1057 == vopt_callout_recipsender
193e3acd
JH
1058 && !random_local_part
1059 && !pm_mailfrom
5032d1cf 1060 && cutthrough.fd < 0
02b41d71 1061 && !sx.lmtp
193e3acd 1062 )
059ec3d9 1063 {
57cc2785
JH
1064 HDEBUG(D_acl|D_v) debug_printf_indent("holding verify callout open for %s\n",
1065 cutthrough.delivery
1066 ? "cutthrough delivery" : "potential further verifies and delivery");
1067
1068 cutthrough.callout_hold_only = !cutthrough.delivery;
1069 cutthrough.is_tls = tls_out.active >= 0;
1070 cutthrough.fd = sx.outblock.sock; /* We assume no buffer in use in the outblock */
1071 cutthrough.nrcpt = 1;
1072 cutthrough.transport = addr->transport->name;
1073 cutthrough.interface = interface;
1074 cutthrough.snd_port = sending_port;
1075 cutthrough.peer_options = smtp_peer_options;
1076 cutthrough.host = *host;
1077 {
1078 int oldpool = store_pool;
1079 store_pool = POOL_PERM;
1080 cutthrough.snd_ip = string_copy(sending_ip_address);
1081 cutthrough.host.name = string_copy(host->name);
1082 cutthrough.host.address = string_copy(host->address);
1083 store_pool = oldpool;
1084 }
1085 cutthrough.addr = *addr; /* Save the address_item for later logging */
1086 cutthrough.addr.next = NULL;
5032d1cf 1087 cutthrough.addr.host_used = &cutthrough.host;
193e3acd 1088 if (addr->parent)
5032d1cf
JH
1089 *(cutthrough.addr.parent = store_get(sizeof(address_item))) =
1090 *addr->parent;
193e3acd
JH
1091 ctblock.buffer = ctbuffer;
1092 ctblock.buffersize = sizeof(ctbuffer);
1093 ctblock.ptr = ctbuffer;
1094 /* ctblock.cmd_count = 0; ctblock.authenticating = FALSE; */
5032d1cf 1095 ctblock.sock = cutthrough.fd;
059ec3d9 1096 }
193e3acd 1097 else
059ec3d9 1098 {
57cc2785 1099 /* Ensure no cutthrough on multiple verifies that were incompatible */
193e3acd 1100 if (options & vopt_callout_recipsender)
57cc2785 1101 cancel_cutthrough_connection(TRUE, US"not usable for cutthrough");
02b41d71 1102 if (sx.send_quit)
2760b518 1103 {
4e910c01 1104 (void) smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
059ec3d9 1105
2760b518 1106 /* Wait a short time for response, and discard it */
e9166683 1107 smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
2760b518
JH
1108 '2', 1);
1109 }
1110
02b41d71
JH
1111 if (sx.inblock.sock >= 0)
1112 {
a7538db1 1113#ifdef SUPPORT_TLS
dec766a1 1114 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
a7538db1 1115#endif
e1d04f48 1116 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
02b41d71
JH
1117 (void)close(sx.inblock.sock);
1118 sx.inblock.sock = sx.outblock.sock = -1;
0cbf2b82 1119#ifndef DISABLE_EVENT
02b41d71 1120 (void) event_raise(addr->transport->event_action, US"tcp:close", NULL);
a7538db1 1121#endif
02b41d71 1122 }
059ec3d9 1123 }
059ec3d9 1124
e9166683
JH
1125 if (!done || yield != OK)
1126 addr->message = string_sprintf("%s [%s] : %s", host->name, host->address,
1127 addr->message);
193e3acd
JH
1128 } /* Loop through all hosts, while !done */
1129 }
059ec3d9
PH
1130
1131/* If we get here with done == TRUE, a successful callout happened, and yield
1132will be set OK or FAIL according to the response to the RCPT command.
1133Otherwise, we looped through the hosts but couldn't complete the business.
707ee5b1 1134However, there may be domain-specific information to cache in both cases. */
059ec3d9 1135
707ee5b1
JH
1136if (!(options & vopt_callout_no_cache))
1137 cache_callout_write(&new_domain_record, addr->domain,
1138 done, &new_address_record, address_key);
059ec3d9
PH
1139
1140/* Failure to connect to any host, or any response other than 2xx or 5xx is a
1141temporary error. If there was only one host, and a response was received, leave
1142it alone if supplying details. Otherwise, give a generic response. */
1143
707ee5b1 1144if (!done)
059ec3d9 1145 {
ff5929e3 1146 uschar * dullmsg = string_sprintf("Could not complete %s verify callout",
8b9476ba 1147 options & vopt_is_recipient ? "recipient" : "sender");
059ec3d9
PH
1148 yield = DEFER;
1149
02b41d71
JH
1150 addr->message = host_list->next || !addr->message
1151 ? dullmsg : string_sprintf("%s: %s", dullmsg, addr->message);
059ec3d9 1152
ff5929e3
JH
1153 addr->user_message = smtp_return_error_details
1154 ? string_sprintf("%s for <%s>.\n"
059ec3d9
PH
1155 "The mail server(s) for the domain may be temporarily unreachable, or\n"
1156 "they may be permanently unreachable from this server. In the latter case,\n%s",
1157 dullmsg, addr->address,
8b9476ba 1158 options & vopt_is_recipient
ff5929e3 1159 ? "the address will never be accepted."
8b9476ba
JH
1160 : "you need to change the address or create an MX record for its domain\n"
1161 "if it is supposed to be generally accessible from the Internet.\n"
ff5929e3
JH
1162 "Talk to your mail administrator for details.")
1163 : dullmsg;
059ec3d9
PH
1164
1165 /* Force a specific error code */
1166
1167 addr->basic_errno = ERRNO_CALLOUTDEFER;
1168 }
1169
1170/* Come here from within the cache-reading code on fast-track exit. */
1171
1172END_CALLOUT:
02b41d71 1173tls_modify_variables(&tls_in);
059ec3d9
PH
1174return yield;
1175}
1176
1177
1178
817d9f57
JH
1179/* Called after recipient-acl to get a cutthrough connection open when
1180 one was requested and a recipient-verify wasn't subsequently done.
1181*/
f9334a28 1182int
e4bdf652
JH
1183open_cutthrough_connection( address_item * addr )
1184{
1185address_item addr2;
f9334a28 1186int rc;
e4bdf652
JH
1187
1188/* Use a recipient-verify-callout to set up the cutthrough connection. */
1189/* We must use a copy of the address for verification, because it might
1190get rewritten. */
1191
1192addr2 = *addr;
e1d04f48 1193HDEBUG(D_acl) debug_printf_indent("----------- %s cutthrough setup ------------\n",
5032d1cf 1194 rcpt_count > 1 ? "more" : "start");
ff5929e3 1195rc = verify_address(&addr2, NULL,
e4bdf652
JH
1196 vopt_is_recipient | vopt_callout_recipsender | vopt_callout_no_cache,
1197 CUTTHROUGH_CMD_TIMEOUT, -1, -1,
1198 NULL, NULL, NULL);
ff5929e3
JH
1199addr->message = addr2.message;
1200addr->user_message = addr2.user_message;
e1d04f48 1201HDEBUG(D_acl) debug_printf_indent("----------- end cutthrough setup ------------\n");
f9334a28 1202return rc;
e4bdf652
JH
1203}
1204
1205
e4bdf652 1206
817d9f57
JH
1207/* Send given number of bytes from the buffer */
1208static BOOL
1209cutthrough_send(int n)
e4bdf652 1210{
5032d1cf 1211if(cutthrough.fd < 0)
817d9f57 1212 return TRUE;
e4bdf652 1213
817d9f57
JH
1214if(
1215#ifdef SUPPORT_TLS
925ac8e4 1216 tls_out.active == cutthrough.fd ? tls_write(FALSE, ctblock.buffer, n, FALSE) :
817d9f57 1217#endif
5032d1cf 1218 send(cutthrough.fd, ctblock.buffer, n, 0) > 0
817d9f57
JH
1219 )
1220{
1221 transport_count += n;
1222 ctblock.ptr= ctblock.buffer;
1223 return TRUE;
1224}
e4bdf652 1225
e1d04f48 1226HDEBUG(D_transport|D_acl) debug_printf_indent("cutthrough_send failed: %s\n", strerror(errno));
817d9f57 1227return FALSE;
e4bdf652
JH
1228}
1229
1230
1231
817d9f57
JH
1232static BOOL
1233_cutthrough_puts(uschar * cp, int n)
1234{
1235while(n--)
1236 {
1237 if(ctblock.ptr >= ctblock.buffer+ctblock.buffersize)
1238 if(!cutthrough_send(ctblock.buffersize))
1239 return FALSE;
1240
1241 *ctblock.ptr++ = *cp++;
1242 }
1243return TRUE;
1244}
1245
1246/* Buffered output of counted data block. Return boolean success */
57cc2785 1247static BOOL
e4bdf652
JH
1248cutthrough_puts(uschar * cp, int n)
1249{
5032d1cf 1250if (cutthrough.fd < 0) return TRUE;
817d9f57 1251if (_cutthrough_puts(cp, n)) return TRUE;
57cc2785 1252cancel_cutthrough_connection(TRUE, US"transmit failed");
817d9f57
JH
1253return FALSE;
1254}
e4bdf652 1255
6851a9c5 1256void
57cc2785
JH
1257cutthrough_data_puts(uschar * cp, int n)
1258{
6851a9c5 1259if (cutthrough.delivery) (void) cutthrough_puts(cp, n);
78a3bbd5 1260return;
57cc2785
JH
1261}
1262
e4bdf652 1263
817d9f57 1264static BOOL
5032d1cf 1265_cutthrough_flush_send(void)
817d9f57 1266{
57cc2785 1267int n = ctblock.ptr - ctblock.buffer;
e4bdf652 1268
817d9f57
JH
1269if(n>0)
1270 if(!cutthrough_send(n))
1271 return FALSE;
1272return TRUE;
e4bdf652
JH
1273}
1274
817d9f57
JH
1275
1276/* Send out any bufferred output. Return boolean success. */
e4bdf652 1277BOOL
5032d1cf 1278cutthrough_flush_send(void)
e4bdf652 1279{
817d9f57 1280if (_cutthrough_flush_send()) return TRUE;
57cc2785 1281cancel_cutthrough_connection(TRUE, US"transmit failed");
e4bdf652
JH
1282return FALSE;
1283}
1284
1285
57cc2785 1286static BOOL
5032d1cf 1287cutthrough_put_nl(void)
e4bdf652
JH
1288{
1289return cutthrough_puts(US"\r\n", 2);
1290}
1291
1292
6851a9c5 1293void
57cc2785
JH
1294cutthrough_data_put_nl(void)
1295{
6851a9c5 1296cutthrough_data_puts(US"\r\n", 2);
57cc2785
JH
1297}
1298
1299
e4bdf652
JH
1300/* Get and check response from cutthrough target */
1301static uschar
57cc2785 1302cutthrough_response(int fd, char expect, uschar ** copy, int timeout)
e4bdf652
JH
1303{
1304smtp_inblock inblock;
1305uschar inbuffer[4096];
1306uschar responsebuffer[4096];
1307
1308inblock.buffer = inbuffer;
1309inblock.buffersize = sizeof(inbuffer);
1310inblock.ptr = inbuffer;
1311inblock.ptrend = inbuffer;
57cc2785 1312inblock.sock = fd;
817d9f57 1313/* this relies on (inblock.sock == tls_out.active) */
2760b518 1314if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, timeout))
57cc2785 1315 cancel_cutthrough_connection(TRUE, US"target timeout on read");
e4bdf652 1316
57cc2785 1317if(copy)
e4bdf652
JH
1318 {
1319 uschar * cp;
5032d1cf 1320 *copy = cp = string_copy(responsebuffer);
e4bdf652
JH
1321 /* Trim the trailing end of line */
1322 cp += Ustrlen(responsebuffer);
1323 if(cp > *copy && cp[-1] == '\n') *--cp = '\0';
1324 if(cp > *copy && cp[-1] == '\r') *--cp = '\0';
1325 }
1326
1327return responsebuffer[0];
1328}
1329
1330
1331/* Negotiate dataphase with the cutthrough target, returning success boolean */
1332BOOL
5032d1cf 1333cutthrough_predata(void)
e4bdf652 1334{
57cc2785 1335if(cutthrough.fd < 0 || cutthrough.callout_hold_only)
e4bdf652
JH
1336 return FALSE;
1337
e1d04f48 1338HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> DATA\n");
817d9f57
JH
1339cutthrough_puts(US"DATA\r\n", 6);
1340cutthrough_flush_send();
e4bdf652
JH
1341
1342/* Assume nothing buffered. If it was it gets ignored. */
57cc2785 1343return cutthrough_response(cutthrough.fd, '3', NULL, CUTTHROUGH_DATA_TIMEOUT) == '3';
e4bdf652
JH
1344}
1345
1346
42055a33 1347/* tctx arg only to match write_chunk() */
511a6c14 1348static BOOL
42055a33 1349cutthrough_write_chunk(transport_ctx * tctx, uschar * s, int len)
511a6c14
JH
1350{
1351uschar * s2;
1352while(s && (s2 = Ustrchr(s, '\n')))
1353 {
1354 if(!cutthrough_puts(s, s2-s) || !cutthrough_put_nl())
1355 return FALSE;
1356 s = s2+1;
1357 }
1358return TRUE;
1359}
1360
1361
e4bdf652 1362/* Buffered send of headers. Return success boolean. */
817d9f57 1363/* Expands newlines to wire format (CR,NL). */
e4bdf652 1364/* Also sends header-terminating blank line. */
e4bdf652 1365BOOL
5032d1cf 1366cutthrough_headers_send(void)
e4bdf652 1367{
6d5c916c
JH
1368transport_ctx tctx;
1369
57cc2785 1370if(cutthrough.fd < 0 || cutthrough.callout_hold_only)
e4bdf652
JH
1371 return FALSE;
1372
511a6c14
JH
1373/* We share a routine with the mainline transport to handle header add/remove/rewrites,
1374 but having a separate buffered-output function (for now)
1375*/
e1d04f48 1376HDEBUG(D_acl) debug_printf_indent("----------- start cutthrough headers send -----------\n");
e4bdf652 1377
42055a33 1378tctx.u.fd = cutthrough.fd;
6d5c916c
JH
1379tctx.tblock = cutthrough.addr.transport;
1380tctx.addr = &cutthrough.addr;
1381tctx.check_string = US".";
1382tctx.escape_string = US"..";
328c5688 1383/*XXX check under spool_files_wireformat. Might be irrelevant */
6d5c916c
JH
1384tctx.options = topt_use_crlf;
1385
42055a33 1386if (!transport_headers_send(&tctx, &cutthrough_write_chunk))
511a6c14
JH
1387 return FALSE;
1388
e1d04f48 1389HDEBUG(D_acl) debug_printf_indent("----------- done cutthrough headers send ------------\n");
511a6c14 1390return TRUE;
817d9f57
JH
1391}
1392
1393
1394static void
78a3bbd5 1395close_cutthrough_connection(const uschar * why)
817d9f57 1396{
57cc2785
JH
1397int fd = cutthrough.fd;
1398if(fd >= 0)
817d9f57
JH
1399 {
1400 /* We could be sending this after a bunch of data, but that is ok as
1401 the only way to cancel the transfer in dataphase is to drop the tcp
1402 conn before the final dot.
1403 */
1404 ctblock.ptr = ctbuffer;
e1d04f48 1405 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n");
817d9f57
JH
1406 _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */
1407 _cutthrough_flush_send();
57cc2785 1408 cutthrough.fd = -1; /* avoid recursion via read timeout */
06fdb9f7 1409 cutthrough.nrcpt = 0; /* permit re-cutthrough on subsequent message */
2760b518
JH
1410
1411 /* Wait a short time for response, and discard it */
57cc2785 1412 cutthrough_response(fd, '2', NULL, 1);
817d9f57 1413
57cc2785 1414#ifdef SUPPORT_TLS
dec766a1 1415 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
57cc2785 1416#endif
e1d04f48 1417 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
57cc2785 1418 (void)close(fd);
e1d04f48 1419 HDEBUG(D_acl) debug_printf_indent("----------- cutthrough shutdown (%s) ------------\n", why);
817d9f57
JH
1420 }
1421ctblock.ptr = ctbuffer;
e4bdf652
JH
1422}
1423
817d9f57 1424void
57cc2785
JH
1425cancel_cutthrough_connection(BOOL close_noncutthrough_verifies, const uschar * why)
1426{
1427if (cutthrough.delivery || close_noncutthrough_verifies)
1428 close_cutthrough_connection(why);
1429cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
1430}
1431
1432
1433void
1434release_cutthrough_connection(const uschar * why)
817d9f57 1435{
5ea5d64c 1436if (cutthrough.fd < 0) return;
57cc2785
JH
1437HDEBUG(D_acl) debug_printf_indent("release cutthrough conn: %s\n", why);
1438cutthrough.fd = -1;
1439cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
817d9f57
JH
1440}
1441
1442
1443
e4bdf652
JH
1444
1445/* Have senders final-dot. Send one to cutthrough target, and grab the response.
1446 Log an OK response as a transmission.
817d9f57 1447 Close the connection.
e4bdf652 1448 Return smtp response-class digit.
e4bdf652
JH
1449*/
1450uschar *
5032d1cf 1451cutthrough_finaldot(void)
e4bdf652 1452{
5032d1cf
JH
1453uschar res;
1454address_item * addr;
e1d04f48 1455HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> .\n");
e4bdf652
JH
1456
1457/* Assume data finshed with new-line */
5032d1cf
JH
1458if( !cutthrough_puts(US".", 1)
1459 || !cutthrough_put_nl()
1460 || !cutthrough_flush_send()
1461 )
1462 return cutthrough.addr.message;
e4bdf652 1463
57cc2785 1464res = cutthrough_response(cutthrough.fd, '2', &cutthrough.addr.message, CUTTHROUGH_DATA_TIMEOUT);
5032d1cf 1465for (addr = &cutthrough.addr; addr; addr = addr->next)
817d9f57 1466 {
5032d1cf
JH
1467 addr->message = cutthrough.addr.message;
1468 switch(res)
1469 {
1470 case '2':
1471 delivery_log(LOG_MAIN, addr, (int)'>', NULL);
78a3bbd5 1472 close_cutthrough_connection(US"delivered");
5032d1cf 1473 break;
817d9f57 1474
5032d1cf
JH
1475 case '4':
1476 delivery_log(LOG_MAIN, addr, 0,
1477 US"tmp-reject from cutthrough after DATA:");
1478 break;
e4bdf652 1479
5032d1cf
JH
1480 case '5':
1481 delivery_log(LOG_MAIN|LOG_REJECT, addr, 0,
1482 US"rejected after DATA:");
1483 break;
e4bdf652 1484
5032d1cf
JH
1485 default:
1486 break;
1487 }
817d9f57 1488 }
5032d1cf 1489return cutthrough.addr.message;
e4bdf652
JH
1490}
1491
1492
817d9f57 1493
059ec3d9
PH
1494/*************************************************
1495* Copy error to toplevel address *
1496*************************************************/
1497
1498/* This function is used when a verify fails or defers, to ensure that the
1499failure or defer information is in the original toplevel address. This applies
1500when an address is redirected to a single new address, and the failure or
1501deferral happens to the child address.
1502
1503Arguments:
1504 vaddr the verify address item
1505 addr the final address item
1506 yield FAIL or DEFER
1507
1508Returns: the value of YIELD
1509*/
1510
1511static int
1512copy_error(address_item *vaddr, address_item *addr, int yield)
1513{
1514if (addr != vaddr)
1515 {
1516 vaddr->message = addr->message;
1517 vaddr->user_message = addr->user_message;
1518 vaddr->basic_errno = addr->basic_errno;
1519 vaddr->more_errno = addr->more_errno;
d43cbe25 1520 vaddr->prop.address_data = addr->prop.address_data;
42855d71 1521 copyflag(vaddr, addr, af_pass_message);
059ec3d9
PH
1522 }
1523return yield;
1524}
1525
1526
1527
1528
ce552449
NM
1529/**************************************************
1530* printf that automatically handles TLS if needed *
1531***************************************************/
1532
1533/* This function is used by verify_address() as a substitute for all fprintf()
1534calls; a direct fprintf() will not produce output in a TLS SMTP session, such
1535as a response to an EXPN command. smtp_in.c makes smtp_printf available but
1536that assumes that we always use the smtp_out FILE* when not using TLS or the
1537ssl buffer when we are. Instead we take a FILE* parameter and check to see if
1538that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular
1539fprintf().
1540
1541Arguments:
1542 f the candidate FILE* to write to
1543 format format string
1544 ... optional arguments
1545
1546Returns:
1547 nothing
1548*/
1549
1550static void PRINTF_FUNCTION(2,3)
1ba28e2b 1551respond_printf(FILE *f, const char *format, ...)
ce552449
NM
1552{
1553va_list ap;
1554
1555va_start(ap, format);
1556if (smtp_out && (f == smtp_out))
925ac8e4 1557 smtp_vprintf(format, FALSE, ap);
ce552449 1558else
513afc6a 1559 vfprintf(f, format, ap);
ce552449
NM
1560va_end(ap);
1561}
1562
1563
1564
059ec3d9
PH
1565/*************************************************
1566* Verify an email address *
1567*************************************************/
1568
1569/* This function is used both for verification (-bv and at other times) and
1570address testing (-bt), which is indicated by address_test_mode being set.
1571
1572Arguments:
1573 vaddr contains the address to verify; the next field in this block
1574 must be NULL
1575 f if not NULL, write the result to this file
1576 options various option bits:
1577 vopt_fake_sender => this sender verify is not for the real
1578 sender (it was verify=sender=xxxx or an address from a
1579 header line) - rewriting must not change sender_address
1580 vopt_is_recipient => this is a recipient address, otherwise
1581 it's a sender address - this affects qualification and
1582 rewriting and messages from callouts
1583 vopt_qualify => qualify an unqualified address; else error
1584 vopt_expn => called from SMTP EXPN command
eafd343b
TK
1585 vopt_success_on_redirect => when a new address is generated
1586 the verification instantly succeeds
059ec3d9
PH
1587
1588 These ones are used by do_callout() -- the options variable
1589 is passed to it.
1590
2a4be8f9 1591 vopt_callout_fullpm => if postmaster check, do full one
059ec3d9
PH
1592 vopt_callout_no_cache => don't use callout cache
1593 vopt_callout_random => do the "random" thing
1594 vopt_callout_recipsender => use real sender for recipient
1595 vopt_callout_recippmaster => use postmaster for recipient
1596
1597 callout if > 0, specifies that callout is required, and gives timeout
4deaf07d 1598 for individual commands
059ec3d9
PH
1599 callout_overall if > 0, gives overall timeout for the callout function;
1600 if < 0, a default is used (see do_callout())
8e669ac1 1601 callout_connect the connection timeout for callouts
059ec3d9
PH
1602 se_mailfrom when callout is requested to verify a sender, use this
1603 in MAIL FROM; NULL => ""
1604 pm_mailfrom when callout is requested, if non-NULL, do the postmaster
1605 thing and use this as the sender address (may be "")
1606
1607 routed if not NULL, set TRUE if routing succeeded, so we can
1608 distinguish between routing failed and callout failed
1609
1610Returns: OK address verified
1611 FAIL address failed to verify
1612 DEFER can't tell at present
1613*/
1614
1615int
1616verify_address(address_item *vaddr, FILE *f, int options, int callout,
8e669ac1 1617 int callout_overall, int callout_connect, uschar *se_mailfrom,
4deaf07d 1618 uschar *pm_mailfrom, BOOL *routed)
059ec3d9
PH
1619{
1620BOOL allok = TRUE;
1621BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0);
059ec3d9 1622BOOL expn = (options & vopt_expn) != 0;
eafd343b 1623BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0;
059ec3d9
PH
1624int i;
1625int yield = OK;
1626int verify_type = expn? v_expn :
1627 address_test_mode? v_none :
8b9476ba 1628 options & vopt_is_recipient? v_recipient : v_sender;
059ec3d9
PH
1629address_item *addr_list;
1630address_item *addr_new = NULL;
1631address_item *addr_remote = NULL;
1632address_item *addr_local = NULL;
1633address_item *addr_succeed = NULL;
8b9476ba
JH
1634uschar **failure_ptr = options & vopt_is_recipient
1635 ? &recipient_verify_failure : &sender_verify_failure;
059ec3d9
PH
1636uschar *ko_prefix, *cr;
1637uschar *address = vaddr->address;
1638uschar *save_sender;
1639uschar null_sender[] = { 0 }; /* Ensure writeable memory */
1640
2c7db3f5
PH
1641/* Clear, just in case */
1642
1643*failure_ptr = NULL;
1644
059ec3d9
PH
1645/* Set up a prefix and suffix for error message which allow us to use the same
1646output statements both in EXPN mode (where an SMTP response is needed) and when
1647debugging with an output file. */
1648
1649if (expn)
1650 {
1651 ko_prefix = US"553 ";
1652 cr = US"\r";
1653 }
1654else ko_prefix = cr = US"";
1655
1656/* Add qualify domain if permitted; otherwise an unqualified address fails. */
1657
1658if (parse_find_at(address) == NULL)
1659 {
1660 if ((options & vopt_qualify) == 0)
1661 {
1662 if (f != NULL)
ce552449
NM
1663 respond_printf(f, "%sA domain is required for \"%s\"%s\n",
1664 ko_prefix, address, cr);
8e669ac1 1665 *failure_ptr = US"qualify";
059ec3d9
PH
1666 return FAIL;
1667 }
8b9476ba 1668 address = rewrite_address_qualify(address, options & vopt_is_recipient);
059ec3d9
PH
1669 }
1670
1671DEBUG(D_verify)
1672 {
1673 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1674 debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address);
1675 }
1676
1677/* Rewrite and report on it. Clear the domain and local part caches - these
1678may have been set by domains and local part tests during an ACL. */
1679
1680if (global_rewrite_rules != NULL)
1681 {
1682 uschar *old = address;
8b9476ba 1683 address = rewrite_address(address, options & vopt_is_recipient, FALSE,
059ec3d9
PH
1684 global_rewrite_rules, rewrite_existflags);
1685 if (address != old)
1686 {
1687 for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0;
1688 for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0;
1689 if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address);
1690 }
1691 }
1692
1693/* If this is the real sender address, we must update sender_address at
1694this point, because it may be referred to in the routers. */
1695
1696if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0)
1697 sender_address = address;
1698
1699/* If the address was rewritten to <> no verification can be done, and we have
1700to return OK. This rewriting is permitted only for sender addresses; for other
1701addresses, such rewriting fails. */
1702
1703if (address[0] == 0) return OK;
1704
d9b2312b
JH
1705/* Flip the legacy TLS-related variables over to the outbound set in case
1706they're used in the context of a transport used by verification. Reset them
ea90b718 1707at exit from this routine (so no returns allowed from here on). */
d9b2312b 1708
35aba663 1709tls_modify_variables(&tls_out);
d9b2312b 1710
059ec3d9
PH
1711/* Save a copy of the sender address for re-instating if we change it to <>
1712while verifying a sender address (a nice bit of self-reference there). */
1713
1714save_sender = sender_address;
1715
ea90b718
JH
1716/* Observability variable for router/transport use */
1717
8b9476ba 1718verify_mode = options & vopt_is_recipient ? US"R" : US"S";
ea90b718 1719
059ec3d9
PH
1720/* Update the address structure with the possibly qualified and rewritten
1721address. Set it up as the starting address on the chain of new addresses. */
1722
1723vaddr->address = address;
1724addr_new = vaddr;
1725
1726/* We need a loop, because an address can generate new addresses. We must also
1727cope with generated pipes and files at the top level. (See also the code and
1728comment in deliver.c.) However, it is usually the case that the router for
1729user's .forward files has its verify flag turned off.
1730
1731If an address generates more than one child, the loop is used only when
1732full_info is set, and this can only be set locally. Remote enquiries just get
1733information about the top level address, not anything that it generated. */
1734
ea90b718 1735while (addr_new)
059ec3d9
PH
1736 {
1737 int rc;
1738 address_item *addr = addr_new;
1739
1740 addr_new = addr->next;
1741 addr->next = NULL;
1742
1743 DEBUG(D_verify)
1744 {
1745 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1746 debug_printf("Considering %s\n", addr->address);
1747 }
1748
1749 /* Handle generated pipe, file or reply addresses. We don't get these
1750 when handling EXPN, as it does only one level of expansion. */
1751
1752 if (testflag(addr, af_pfr))
1753 {
1754 allok = FALSE;
1755 if (f != NULL)
1756 {
1757 BOOL allow;
1758
1759 if (addr->address[0] == '>')
1760 {
1761 allow = testflag(addr, af_allow_reply);
1762 fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1);
1763 }
1764 else
1765 {
1766 allow = (addr->address[0] == '|')?
1767 testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file);
1768 fprintf(f, "%s -> %s", addr->parent->address, addr->address);
1769 }
1770
1771 if (addr->basic_errno == ERRNO_BADTRANSPORT)
1772 fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n"
1773 "%s\n", addr->message);
1774 else if (allow)
1775 fprintf(f, "\n transport = %s\n", addr->transport->name);
1776 else
1777 fprintf(f, " *** forbidden ***\n");
1778 }
1779 continue;
1780 }
1781
1782 /* Just in case some router parameter refers to it. */
1783
2f682e45
JH
1784 return_path = addr->prop.errors_address
1785 ? addr->prop.errors_address : sender_address;
059ec3d9
PH
1786
1787 /* Split the address into domain and local part, handling the %-hack if
1788 necessary, and then route it. While routing a sender address, set
1789 $sender_address to <> because that is what it will be if we were trying to
1790 send a bounce to the sender. */
1791
2f682e45 1792 if (routed) *routed = FALSE;
059ec3d9
PH
1793 if ((rc = deliver_split_address(addr)) == OK)
1794 {
8b9476ba 1795 if (!(options & vopt_is_recipient)) sender_address = null_sender;
059ec3d9
PH
1796 rc = route_address(addr, &addr_local, &addr_remote, &addr_new,
1797 &addr_succeed, verify_type);
1798 sender_address = save_sender; /* Put back the real sender */
1799 }
1800
1801 /* If routing an address succeeded, set the flag that remembers, for use when
1802 an ACL cached a sender verify (in case a callout fails). Then if routing set
1803 up a list of hosts or the transport has a host list, and the callout option
1804 is set, and we aren't in a host checking run, do the callout verification,
1805 and set another flag that notes that a callout happened. */
1806
1807 if (rc == OK)
1808 {
2f682e45 1809 if (routed) *routed = TRUE;
059ec3d9
PH
1810 if (callout > 0)
1811 {
08f3b11b 1812 transport_instance * tp;
2f682e45 1813 host_item * host_list = addr->host_list;
059ec3d9 1814
26da7e20
PH
1815 /* Make up some data for use in the case where there is no remote
1816 transport. */
1817
1818 transport_feedback tf = {
f2ed27cf
JH
1819 .interface = NULL, /* interface (=> any) */
1820 .port = US"smtp",
1821 .protocol = US"smtp",
1822 .hosts = NULL,
1823 .helo_data = US"$smtp_active_hostname",
1824 .hosts_override = FALSE,
1825 .hosts_randomize = FALSE,
1826 .gethostbyname = FALSE,
1827 .qualify_single = TRUE,
1828 .search_parents = FALSE
26da7e20 1829 };
059ec3d9
PH
1830
1831 /* If verification yielded a remote transport, we want to use that
1832 transport's options, so as to mimic what would happen if we were really
1833 sending a message to this address. */
1834
08f3b11b 1835 if ((tp = addr->transport) && !tp->info->local)
059ec3d9 1836 {
08f3b11b 1837 (void)(tp->setup)(tp, addr, &tf, 0, 0, NULL);
059ec3d9
PH
1838
1839 /* If the transport has hosts and the router does not, or if the
1840 transport is configured to override the router's hosts, we must build a
1841 host list of the transport's hosts, and find the IP addresses */
1842
2f682e45 1843 if (tf.hosts && (!host_list || tf.hosts_override))
059ec3d9
PH
1844 {
1845 uschar *s;
55414b25 1846 const uschar *save_deliver_domain = deliver_domain;
750af86e 1847 uschar *save_deliver_localpart = deliver_localpart;
059ec3d9
PH
1848
1849 host_list = NULL; /* Ignore the router's hosts */
1850
1851 deliver_domain = addr->domain;
1852 deliver_localpart = addr->local_part;
1853 s = expand_string(tf.hosts);
750af86e
PH
1854 deliver_domain = save_deliver_domain;
1855 deliver_localpart = save_deliver_localpart;
059ec3d9 1856
2f682e45 1857 if (!s)
059ec3d9
PH
1858 {
1859 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts "
1860 "\"%s\" in %s transport for callout: %s", tf.hosts,
08f3b11b 1861 tp->name, expand_string_message);
059ec3d9
PH
1862 }
1863 else
1864 {
322050c2 1865 int flags;
d8ef3577 1866 host_item *host, *nexthost;
059ec3d9
PH
1867 host_build_hostlist(&host_list, s, tf.hosts_randomize);
1868
1869 /* Just ignore failures to find a host address. If we don't manage
8e669ac1
PH
1870 to find any addresses, the callout will defer. Note that more than
1871 one address may be found for a single host, which will result in
1872 additional host items being inserted into the chain. Hence we must
d8ef3577 1873 save the next host first. */
059ec3d9 1874
66387a73 1875 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
322050c2
PH
1876 if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
1877 if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
1878
2f682e45 1879 for (host = host_list; host; host = nexthost)
059ec3d9 1880 {
d8ef3577 1881 nexthost = host->next;
8e669ac1 1882 if (tf.gethostbyname ||
7e66e54d 1883 string_is_ip_address(host->name, NULL) != 0)
55414b25 1884 (void)host_find_byname(host, NULL, flags, NULL, TRUE);
059ec3d9 1885 else
9d9c3746 1886 {
7cd171b7 1887 dnssec_domains * dnssec_domains = NULL;
08f3b11b 1888 if (Ustrcmp(tp->driver_name, "smtp") == 0)
9d9c3746
JH
1889 {
1890 smtp_transport_options_block * ob =
08f3b11b 1891 (smtp_transport_options_block *) tp->options_block;
7cd171b7 1892 dnssec_domains = &ob->dnssec;
9d9c3746
JH
1893 }
1894
2546388c 1895 (void) host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
7cd171b7 1896 dnssec_domains, NULL, NULL);
9d9c3746 1897 }
059ec3d9
PH
1898 }
1899 }
1900 }
1901 }
1902
8e669ac1 1903 /* Can only do a callout if we have at least one host! If the callout
2c7db3f5 1904 fails, it will have set ${sender,recipient}_verify_failure. */
059ec3d9 1905
2f682e45 1906 if (host_list)
059ec3d9
PH
1907 {
1908 HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n");
1909 if (host_checking && !host_checking_callout)
1910 {
1911 HDEBUG(D_verify)
1912 debug_printf("... callout omitted by default when host testing\n"
1913 "(Use -bhc if you want the callouts to happen.)\n");
1914 }
1915 else
1916 {
4ed8d31a
JH
1917#ifdef SUPPORT_TLS
1918 deliver_set_expansions(addr);
1919#endif
059ec3d9 1920 rc = do_callout(addr, host_list, &tf, callout, callout_overall,
4deaf07d 1921 callout_connect, options, se_mailfrom, pm_mailfrom);
059ec3d9
PH
1922 }
1923 }
1924 else
1925 {
1926 HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor "
1927 "transport provided a host list\n");
1928 }
1929 }
1930 }
8e669ac1 1931
2c7db3f5 1932 /* Otherwise, any failure is a routing failure */
8e669ac1
PH
1933
1934 else *failure_ptr = US"route";
059ec3d9
PH
1935
1936 /* A router may return REROUTED if it has set up a child address as a result
1937 of a change of domain name (typically from widening). In this case we always
1938 want to continue to verify the new child. */
1939
1940 if (rc == REROUTED) continue;
8e669ac1 1941
059ec3d9
PH
1942 /* Handle hard failures */
1943
1944 if (rc == FAIL)
1945 {
1946 allok = FALSE;
2f682e45 1947 if (f)
059ec3d9 1948 {
e6f6568e
PH
1949 address_item *p = addr->parent;
1950
ce552449 1951 respond_printf(f, "%s%s %s", ko_prefix,
2f682e45
JH
1952 full_info ? addr->address : address,
1953 address_test_mode ? "is undeliverable" : "failed to verify");
059ec3d9
PH
1954 if (!expn && admin_user)
1955 {
1956 if (addr->basic_errno > 0)
ce552449 1957 respond_printf(f, ": %s", strerror(addr->basic_errno));
2f682e45 1958 if (addr->message)
ce552449 1959 respond_printf(f, ": %s", addr->message);
e6f6568e
PH
1960 }
1961
1962 /* Show parents iff doing full info */
1963
2f682e45 1964 if (full_info) while (p)
e6f6568e 1965 {
ce552449 1966 respond_printf(f, "%s\n <-- %s", cr, p->address);
e6f6568e 1967 p = p->parent;
059ec3d9 1968 }
ce552449 1969 respond_printf(f, "%s\n", cr);
059ec3d9 1970 }
57cc2785 1971 cancel_cutthrough_connection(TRUE, US"routing hard fail");
059ec3d9 1972
d9b2312b 1973 if (!full_info)
2f682e45 1974 {
d9b2312b
JH
1975 yield = copy_error(vaddr, addr, FAIL);
1976 goto out;
2f682e45
JH
1977 }
1978 yield = FAIL;
059ec3d9
PH
1979 }
1980
1981 /* Soft failure */
1982
1983 else if (rc == DEFER)
1984 {
1985 allok = FALSE;
2f682e45 1986 if (f)
059ec3d9 1987 {
e6f6568e 1988 address_item *p = addr->parent;
ce552449 1989 respond_printf(f, "%s%s cannot be resolved at this time", ko_prefix,
322050c2 1990 full_info? addr->address : address);
059ec3d9
PH
1991 if (!expn && admin_user)
1992 {
1993 if (addr->basic_errno > 0)
ce552449 1994 respond_printf(f, ": %s", strerror(addr->basic_errno));
2f682e45 1995 if (addr->message)
ce552449 1996 respond_printf(f, ": %s", addr->message);
059ec3d9 1997 else if (addr->basic_errno <= 0)
ce552449 1998 respond_printf(f, ": unknown error");
059ec3d9
PH
1999 }
2000
e6f6568e
PH
2001 /* Show parents iff doing full info */
2002
2f682e45 2003 if (full_info) while (p)
e6f6568e 2004 {
ce552449 2005 respond_printf(f, "%s\n <-- %s", cr, p->address);
e6f6568e
PH
2006 p = p->parent;
2007 }
ce552449 2008 respond_printf(f, "%s\n", cr);
059ec3d9 2009 }
57cc2785 2010 cancel_cutthrough_connection(TRUE, US"routing soft fail");
e4bdf652 2011
d9b2312b
JH
2012 if (!full_info)
2013 {
2014 yield = copy_error(vaddr, addr, DEFER);
2015 goto out;
2016 }
2f682e45 2017 if (yield == OK) yield = DEFER;
059ec3d9
PH
2018 }
2019
2020 /* If we are handling EXPN, we do not want to continue to route beyond
e6f6568e 2021 the top level (whose address is in "address"). */
059ec3d9
PH
2022
2023 else if (expn)
2024 {
2025 uschar *ok_prefix = US"250-";
2f682e45
JH
2026
2027 if (!addr_new)
2028 if (!addr_local && !addr_remote)
ce552449 2029 respond_printf(f, "250 mail to <%s> is discarded\r\n", address);
059ec3d9 2030 else
ce552449 2031 respond_printf(f, "250 <%s>\r\n", address);
2f682e45
JH
2032
2033 else do
059ec3d9
PH
2034 {
2035 address_item *addr2 = addr_new;
2036 addr_new = addr2->next;
2f682e45 2037 if (!addr_new) ok_prefix = US"250 ";
ce552449 2038 respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address);
2f682e45 2039 } while (addr_new);
d9b2312b
JH
2040 yield = OK;
2041 goto out;
059ec3d9
PH
2042 }
2043
2044 /* Successful routing other than EXPN. */
2045
2046 else
2047 {
2048 /* Handle successful routing when short info wanted. Otherwise continue for
2049 other (generated) addresses. Short info is the operational case. Full info
2050 can be requested only when debug_selector != 0 and a file is supplied.
2051
2052 There is a conflict between the use of aliasing as an alternate email
2053 address, and as a sort of mailing list. If an alias turns the incoming
2054 address into just one address (e.g. J.Caesar->jc44) you may well want to
2055 carry on verifying the generated address to ensure it is valid when
2056 checking incoming mail. If aliasing generates multiple addresses, you
2057 probably don't want to do this. Exim therefore treats the generation of
2058 just a single new address as a special case, and continues on to verify the
2059 generated address. */
2060
2f682e45
JH
2061 if ( !full_info /* Stop if short info wanted AND */
2062 && ( ( !addr_new /* No new address OR */
2063 || addr_new->next /* More than one new address OR */
2064 || testflag(addr_new, af_pfr) /* New address is pfr */
2065 )
2066 || /* OR */
2067 ( addr_new /* At least one new address AND */
2068 && success_on_redirect /* success_on_redirect is set */
2069 ) )
2070 )
059ec3d9 2071 {
2f682e45
JH
2072 if (f) fprintf(f, "%s %s\n",
2073 address, address_test_mode ? "is deliverable" : "verified");
059ec3d9
PH
2074
2075 /* If we have carried on to verify a child address, we want the value
2076 of $address_data to be that of the child */
2077
d43cbe25 2078 vaddr->prop.address_data = addr->prop.address_data;
98c82a3d
JH
2079
2080 /* If stopped because more than one new address, cannot cutthrough */
2081
2082 if (addr_new && addr_new->next)
57cc2785 2083 cancel_cutthrough_connection(TRUE, US"multiple addresses from routing");
98c82a3d 2084
d9b2312b
JH
2085 yield = OK;
2086 goto out;
059ec3d9
PH
2087 }
2088 }
2089 } /* Loop for generated addresses */
2090
2091/* Display the full results of the successful routing, including any generated
2092addresses. Control gets here only when full_info is set, which requires f not
2093to be NULL, and this occurs only when a top-level verify is called with the
2094debugging switch on.
2095
2096If there are no local and no remote addresses, and there were no pipes, files,
2097or autoreplies, and there were no errors or deferments, the message is to be
2098discarded, usually because of the use of :blackhole: in an alias file. */
2099
2f682e45 2100if (allok && !addr_local && !addr_remote)
dbcef0ea 2101 {
059ec3d9 2102 fprintf(f, "mail to %s is discarded\n", address);
d9b2312b 2103 goto out;
dbcef0ea 2104 }
059ec3d9 2105
dbcef0ea 2106for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
08f3b11b 2107 while (addr_list)
059ec3d9
PH
2108 {
2109 address_item *addr = addr_list;
2110 address_item *p = addr->parent;
08f3b11b
JH
2111 transport_instance * tp = addr->transport;
2112
059ec3d9
PH
2113 addr_list = addr->next;
2114
2115 fprintf(f, "%s", CS addr->address);
384152a6 2116#ifdef EXPERIMENTAL_SRS
d43cbe25
JH
2117 if(addr->prop.srs_sender)
2118 fprintf(f, " [srs = %s]", addr->prop.srs_sender);
384152a6 2119#endif
dbcef0ea
PH
2120
2121 /* If the address is a duplicate, show something about it. */
2122
2123 if (!testflag(addr, af_pfr))
2124 {
2125 tree_node *tnode;
08f3b11b 2126 if ((tnode = tree_search(tree_duplicates, addr->unique)))
dbcef0ea
PH
2127 fprintf(f, " [duplicate, would not be delivered]");
2128 else tree_add_duplicate(addr->unique, addr);
2129 }
2130
2131 /* Now show its parents */
2132
08f3b11b 2133 for (p = addr->parent; p; p = p->parent)
059ec3d9 2134 fprintf(f, "\n <-- %s", p->address);
059ec3d9
PH
2135 fprintf(f, "\n ");
2136
2137 /* Show router, and transport */
2138
08f3b11b
JH
2139 fprintf(f, "router = %s, transport = %s\n",
2140 addr->router->name, tp ? tp->name : US"unset");
059ec3d9
PH
2141
2142 /* Show any hosts that are set up by a router unless the transport
2143 is going to override them; fiddle a bit to get a nice format. */
2144
08f3b11b 2145 if (addr->host_list && tp && !tp->overrides_hosts)
059ec3d9
PH
2146 {
2147 host_item *h;
2148 int maxlen = 0;
2149 int maxaddlen = 0;
08f3b11b
JH
2150 for (h = addr->host_list; h; h = h->next)
2151 { /* get max lengths of host names, addrs */
059ec3d9
PH
2152 int len = Ustrlen(h->name);
2153 if (len > maxlen) maxlen = len;
08f3b11b 2154 len = h->address ? Ustrlen(h->address) : 7;
059ec3d9
PH
2155 if (len > maxaddlen) maxaddlen = len;
2156 }
08f3b11b
JH
2157 for (h = addr->host_list; h; h = h->next)
2158 {
2159 fprintf(f, " host %-*s ", maxlen, h->name);
2160
2161 if (h->address)
2162 fprintf(f, "[%s%-*c", h->address, maxaddlen+1 - Ustrlen(h->address), ']');
2163 else if (tp->info->local)
2164 fprintf(f, " %-*s ", maxaddlen, ""); /* Omit [unknown] for local */
2165 else
2166 fprintf(f, "[%s%-*c", "unknown", maxaddlen+1 - 7, ']');
2167
2168 if (h->mx >= 0) fprintf(f, " MX=%d", h->mx);
059ec3d9 2169 if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port);
08f3b11b
JH
2170 if (running_in_test_harness && h->dnssec == DS_YES) fputs(" AD", f);
2171 if (h->status == hstatus_unusable) fputs(" ** unusable **", f);
2172 fputc('\n', f);
059ec3d9
PH
2173 }
2174 }
2175 }
059ec3d9 2176
d9b2312b 2177/* Yield will be DEFER or FAIL if any one address has, only for full_info (which is
2c7db3f5
PH
2178the -bv or -bt case). */
2179
d9b2312b 2180out:
ea90b718 2181verify_mode = NULL;
35aba663 2182tls_modify_variables(&tls_in);
d9b2312b 2183
8e669ac1 2184return yield;
059ec3d9
PH
2185}
2186
2187
2188
2189
2190/*************************************************
2191* Check headers for syntax errors *
2192*************************************************/
2193
2194/* This function checks those header lines that contain addresses, and verifies
db57e575 2195that all the addresses therein are 5322-syntactially correct.
059ec3d9
PH
2196
2197Arguments:
2198 msgptr where to put an error message
2199
2200Returns: OK
2201 FAIL
2202*/
2203
2204int
2205verify_check_headers(uschar **msgptr)
2206{
2207header_line *h;
2208uschar *colon, *s;
1eccaa59 2209int yield = OK;
059ec3d9 2210
db57e575 2211for (h = header_list; h && yield == OK; h = h->next)
059ec3d9
PH
2212 {
2213 if (h->type != htype_from &&
2214 h->type != htype_reply_to &&
2215 h->type != htype_sender &&
2216 h->type != htype_to &&
2217 h->type != htype_cc &&
2218 h->type != htype_bcc)
2219 continue;
2220
2221 colon = Ustrchr(h->text, ':');
2222 s = colon + 1;
2223 while (isspace(*s)) s++;
2224
1eccaa59
PH
2225 /* Loop for multiple addresses in the header, enabling group syntax. Note
2226 that we have to reset this after the header has been scanned. */
059ec3d9 2227
1eccaa59 2228 parse_allow_group = TRUE;
059ec3d9 2229
db57e575 2230 while (*s)
059ec3d9
PH
2231 {
2232 uschar *ss = parse_find_address_end(s, FALSE);
2233 uschar *recipient, *errmess;
2234 int terminator = *ss;
2235 int start, end, domain;
2236
2237 /* Temporarily terminate the string at this point, and extract the
1eccaa59 2238 operative address within, allowing group syntax. */
059ec3d9
PH
2239
2240 *ss = 0;
2241 recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
2242 *ss = terminator;
2243
2244 /* Permit an unqualified address only if the message is local, or if the
2245 sending host is configured to be permitted to send them. */
2246
db57e575 2247 if (recipient && !domain)
059ec3d9
PH
2248 {
2249 if (h->type == htype_from || h->type == htype_sender)
2250 {
2251 if (!allow_unqualified_sender) recipient = NULL;
2252 }
2253 else
2254 {
2255 if (!allow_unqualified_recipient) recipient = NULL;
2256 }
2257 if (recipient == NULL) errmess = US"unqualified address not permitted";
2258 }
2259
2260 /* It's an error if no address could be extracted, except for the special
2261 case of an empty address. */
2262
db57e575 2263 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
059ec3d9
PH
2264 {
2265 uschar *verb = US"is";
2266 uschar *t = ss;
1ab95fa6 2267 uschar *tt = colon;
059ec3d9
PH
2268 int len;
2269
2270 /* Arrange not to include any white space at the end in the
1ab95fa6 2271 error message or the header name. */
059ec3d9
PH
2272
2273 while (t > s && isspace(t[-1])) t--;
1ab95fa6 2274 while (tt > h->text && isspace(tt[-1])) tt--;
059ec3d9 2275
1ab95fa6 2276 /* Add the address that failed to the error message, since in a
059ec3d9
PH
2277 header with very many addresses it is sometimes hard to spot
2278 which one is at fault. However, limit the amount of address to
2279 quote - cases have been seen where, for example, a missing double
2280 quote in a humungous To: header creates an "address" that is longer
2281 than string_sprintf can handle. */
2282
2283 len = t - s;
2284 if (len > 1024)
2285 {
2286 len = 1024;
2287 verb = US"begins";
2288 }
2289
55414b25
JH
2290 /* deconst cast ok as we're passing a non-const to string_printing() */
2291 *msgptr = US string_printing(
1ab95fa6 2292 string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s",
bb07bcd3 2293 errmess, (int)(tt - h->text), h->text, verb, len, s));
059ec3d9 2294
1eccaa59
PH
2295 yield = FAIL;
2296 break; /* Out of address loop */
059ec3d9
PH
2297 }
2298
2299 /* Advance to the next address */
2300
db57e575 2301 s = ss + (terminator ? 1 : 0);
059ec3d9
PH
2302 while (isspace(*s)) s++;
2303 } /* Next address */
059ec3d9 2304
1eccaa59
PH
2305 parse_allow_group = FALSE;
2306 parse_found_group = FALSE;
2307 } /* Next header unless yield has been set FALSE */
2308
2309return yield;
059ec3d9
PH
2310}
2311
2312
770747fd
MFM
2313/*************************************************
2314* Check header names for 8-bit characters *
2315*************************************************/
2316
4c04137d 2317/* This function checks for invalid characters in header names. See
770747fd
MFM
2318RFC 5322, 2.2. and RFC 6532, 3.
2319
2320Arguments:
2321 msgptr where to put an error message
2322
2323Returns: OK
2324 FAIL
2325*/
2326
2327int
2328verify_check_header_names_ascii(uschar **msgptr)
2329{
2330header_line *h;
2331uschar *colon, *s;
2332
57cc2785 2333for (h = header_list; h; h = h->next)
770747fd 2334 {
57cc2785
JH
2335 colon = Ustrchr(h->text, ':');
2336 for(s = h->text; s < colon; s++)
2337 if ((*s < 33) || (*s > 126))
2338 {
2339 *msgptr = string_sprintf("Invalid character in header \"%.*s\" found",
2340 colon - h->text, h->text);
2341 return FAIL;
2342 }
770747fd
MFM
2343 }
2344return OK;
2345}
059ec3d9 2346
1c41c9cc
PH
2347/*************************************************
2348* Check for blind recipients *
2349*************************************************/
2350
2351/* This function checks that every (envelope) recipient is mentioned in either
2352the To: or Cc: header lines, thus detecting blind carbon copies.
2353
2354There are two ways of scanning that could be used: either scan the header lines
2355and tick off the recipients, or scan the recipients and check the header lines.
2356The original proposed patch did the former, but I have chosen to do the latter,
2357because (a) it requires no memory and (b) will use fewer resources when there
2358are many addresses in To: and/or Cc: and only one or two envelope recipients.
2359
2360Arguments: none
2361Returns: OK if there are no blind recipients
2362 FAIL if there is at least one blind recipient
2363*/
2364
2365int
2366verify_check_notblind(void)
2367{
2368int i;
2369for (i = 0; i < recipients_count; i++)
2370 {
2371 header_line *h;
2372 BOOL found = FALSE;
2373 uschar *address = recipients_list[i].address;
2374
2375 for (h = header_list; !found && h != NULL; h = h->next)
2376 {
2377 uschar *colon, *s;
2378
2379 if (h->type != htype_to && h->type != htype_cc) continue;
2380
2381 colon = Ustrchr(h->text, ':');
2382 s = colon + 1;
2383 while (isspace(*s)) s++;
2384
1eccaa59
PH
2385 /* Loop for multiple addresses in the header, enabling group syntax. Note
2386 that we have to reset this after the header has been scanned. */
1c41c9cc 2387
1eccaa59 2388 parse_allow_group = TRUE;
1c41c9cc
PH
2389
2390 while (*s != 0)
2391 {
2392 uschar *ss = parse_find_address_end(s, FALSE);
2393 uschar *recipient,*errmess;
2394 int terminator = *ss;
2395 int start, end, domain;
2396
2397 /* Temporarily terminate the string at this point, and extract the
1eccaa59 2398 operative address within, allowing group syntax. */
1c41c9cc
PH
2399
2400 *ss = 0;
2401 recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
2402 *ss = terminator;
2403
2404 /* If we found a valid recipient that has a domain, compare it with the
2405 envelope recipient. Local parts are compared case-sensitively, domains
2406 case-insensitively. By comparing from the start with length "domain", we
2407 include the "@" at the end, which ensures that we are comparing the whole
2408 local part of each address. */
2409
2410 if (recipient != NULL && domain != 0)
2411 {
2412 found = Ustrncmp(recipient, address, domain) == 0 &&
2413 strcmpic(recipient + domain, address + domain) == 0;
2414 if (found) break;
2415 }
2416
2417 /* Advance to the next address */
2418
2419 s = ss + (terminator? 1:0);
2420 while (isspace(*s)) s++;
2421 } /* Next address */
1eccaa59
PH
2422
2423 parse_allow_group = FALSE;
2424 parse_found_group = FALSE;
1c41c9cc
PH
2425 } /* Next header (if found is false) */
2426
2427 if (!found) return FAIL;
2428 } /* Next recipient */
2429
2430return OK;
2431}
2432
2433
059ec3d9
PH
2434
2435/*************************************************
2436* Find if verified sender *
2437*************************************************/
2438
2439/* Usually, just a single address is verified as the sender of the message.
2440However, Exim can be made to verify other addresses as well (often related in
2441some way), and this is useful in some environments. There may therefore be a
2442chain of such addresses that have previously been tested. This function finds
2443whether a given address is on the chain.
2444
2445Arguments: the address to be verified
2446Returns: pointer to an address item, or NULL
2447*/
2448
2449address_item *
2450verify_checked_sender(uschar *sender)
2451{
2452address_item *addr;
2453for (addr = sender_verified_list; addr != NULL; addr = addr->next)
2454 if (Ustrcmp(sender, addr->address) == 0) break;
2455return addr;
2456}
2457
2458
2459
2460
2461
2462/*************************************************
2463* Get valid header address *
2464*************************************************/
2465
2466/* Scan the originator headers of the message, looking for an address that
2467verifies successfully. RFC 822 says:
2468
2469 o The "Sender" field mailbox should be sent notices of
2470 any problems in transport or delivery of the original
2471 messages. If there is no "Sender" field, then the
2472 "From" field mailbox should be used.
2473
2474 o If the "Reply-To" field exists, then the reply should
2475 go to the addresses indicated in that field and not to
2476 the address(es) indicated in the "From" field.
2477
2478So we check a Sender field if there is one, else a Reply_to field, else a From
2479field. As some strange messages may have more than one of these fields,
2480especially if they are resent- fields, check all of them if there is more than
2481one.
2482
2483Arguments:
2484 user_msgptr points to where to put a user error message
2485 log_msgptr points to where to put a log error message
2486 callout timeout for callout check (passed to verify_address())
2487 callout_overall overall callout timeout (ditto)
8e669ac1 2488 callout_connect connect callout timeout (ditto)
059ec3d9
PH
2489 se_mailfrom mailfrom for verify; NULL => ""
2490 pm_mailfrom sender for pm callout check (passed to verify_address())
2491 options callout options (passed to verify_address())
8e669ac1 2492 verrno where to put the address basic_errno
059ec3d9
PH
2493
2494If log_msgptr is set to something without setting user_msgptr, the caller
2495normally uses log_msgptr for both things.
2496
2497Returns: result of the verification attempt: OK, FAIL, or DEFER;
2498 FAIL is given if no appropriate headers are found
2499*/
2500
2501int
2502verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr,
8e669ac1 2503 int callout, int callout_overall, int callout_connect, uschar *se_mailfrom,
fe5b5d0b 2504 uschar *pm_mailfrom, int options, int *verrno)
059ec3d9
PH
2505{
2506static int header_types[] = { htype_sender, htype_reply_to, htype_from };
1eccaa59 2507BOOL done = FALSE;
059ec3d9
PH
2508int yield = FAIL;
2509int i;
2510
1eccaa59 2511for (i = 0; i < 3 && !done; i++)
059ec3d9
PH
2512 {
2513 header_line *h;
1eccaa59 2514 for (h = header_list; h != NULL && !done; h = h->next)
059ec3d9
PH
2515 {
2516 int terminator, new_ok;
2517 uschar *s, *ss, *endname;
2518
2519 if (h->type != header_types[i]) continue;
2520 s = endname = Ustrchr(h->text, ':') + 1;
2521
1eccaa59
PH
2522 /* Scan the addresses in the header, enabling group syntax. Note that we
2523 have to reset this after the header has been scanned. */
2524
2525 parse_allow_group = TRUE;
2526
059ec3d9
PH
2527 while (*s != 0)
2528 {
2529 address_item *vaddr;
2530
2531 while (isspace(*s) || *s == ',') s++;
2532 if (*s == 0) break; /* End of header */
2533
2534 ss = parse_find_address_end(s, FALSE);
2535
2536 /* The terminator is a comma or end of header, but there may be white
2537 space preceding it (including newline for the last address). Move back
2538 past any white space so we can check against any cached envelope sender
2539 address verifications. */
2540
2541 while (isspace(ss[-1])) ss--;
2542 terminator = *ss;
2543 *ss = 0;
2544
2545 HDEBUG(D_verify) debug_printf("verifying %.*s header address %s\n",
2546 (int)(endname - h->text), h->text, s);
2547
2548 /* See if we have already verified this address as an envelope sender,
2549 and if so, use the previous answer. */
2550
2551 vaddr = verify_checked_sender(s);
2552
2553 if (vaddr != NULL && /* Previously checked */
2554 (callout <= 0 || /* No callout needed; OR */
2555 vaddr->special_action > 256)) /* Callout was done */
2556 {
2557 new_ok = vaddr->special_action & 255;
2558 HDEBUG(D_verify) debug_printf("previously checked as envelope sender\n");
2559 *ss = terminator; /* Restore shortened string */
2560 }
2561
2562 /* Otherwise we run the verification now. We must restore the shortened
2563 string before running the verification, so the headers are correct, in
2564 case there is any rewriting. */
2565
2566 else
2567 {
2568 int start, end, domain;
1eccaa59
PH
2569 uschar *address = parse_extract_address(s, log_msgptr, &start, &end,
2570 &domain, FALSE);
059ec3d9
PH
2571
2572 *ss = terminator;
2573
1eccaa59
PH
2574 /* If we found an empty address, just carry on with the next one, but
2575 kill the message. */
2576
2577 if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0)
2578 {
2579 *log_msgptr = NULL;
2580 s = ss;
2581 continue;
2582 }
2583
059ec3d9
PH
2584 /* If verification failed because of a syntax error, fail this
2585 function, and ensure that the failing address gets added to the error
2586 message. */
2587
2588 if (address == NULL)
2589 {
2590 new_ok = FAIL;
1eccaa59
PH
2591 while (ss > s && isspace(ss[-1])) ss--;
2592 *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
2593 "scanning for sender: %s in \"%.*s\"",
bb07bcd3 2594 (int)(endname - h->text), h->text, *log_msgptr, (int)(ss - s), s);
1eccaa59
PH
2595 yield = FAIL;
2596 done = TRUE;
2597 break;
059ec3d9
PH
2598 }
2599
2f6603e1 2600 /* Else go ahead with the sender verification. But it isn't *the*
059ec3d9
PH
2601 sender of the message, so set vopt_fake_sender to stop sender_address
2602 being replaced after rewriting or qualification. */
2603
2604 else
2605 {
2606 vaddr = deliver_make_addr(address, FALSE);
2607 new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender,
8e669ac1 2608 callout, callout_overall, callout_connect, se_mailfrom,
4deaf07d 2609 pm_mailfrom, NULL);
059ec3d9
PH
2610 }
2611 }
2612
2613 /* We now have the result, either newly found, or cached. If we are
2614 giving out error details, set a specific user error. This means that the
2615 last of these will be returned to the user if all three fail. We do not
2616 set a log message - the generic one below will be used. */
2617
fe5b5d0b 2618 if (new_ok != OK)
059ec3d9 2619 {
8e669ac1 2620 *verrno = vaddr->basic_errno;
fe5b5d0b 2621 if (smtp_return_error_details)
fe5b5d0b
PH
2622 *user_msgptr = string_sprintf("Rejected after DATA: "
2623 "could not verify \"%.*s\" header address\n%s: %s",
bb07bcd3 2624 (int)(endname - h->text), h->text, vaddr->address, vaddr->message);
8e669ac1 2625 }
059ec3d9
PH
2626
2627 /* Success or defer */
2628
1eccaa59
PH
2629 if (new_ok == OK)
2630 {
2631 yield = OK;
2632 done = TRUE;
2633 break;
2634 }
2635
059ec3d9
PH
2636 if (new_ok == DEFER) yield = DEFER;
2637
2638 /* Move on to any more addresses in the header */
2639
2640 s = ss;
1eccaa59
PH
2641 } /* Next address */
2642
2643 parse_allow_group = FALSE;
2644 parse_found_group = FALSE;
2645 } /* Next header, unless done */
2646 } /* Next header type unless done */
059ec3d9
PH
2647
2648if (yield == FAIL && *log_msgptr == NULL)
2649 *log_msgptr = US"there is no valid sender in any header line";
2650
2651if (yield == DEFER && *log_msgptr == NULL)
2652 *log_msgptr = US"all attempts to verify a sender in a header line deferred";
2653
2654return yield;
2655}
2656
2657
2658
2659
2660/*************************************************
2661* Get RFC 1413 identification *
2662*************************************************/
2663
2664/* Attempt to get an id from the sending machine via the RFC 1413 protocol. If
2665the timeout is set to zero, then the query is not done. There may also be lists
2666of hosts and nets which are exempt. To guard against malefactors sending
2667non-printing characters which could, for example, disrupt a message's headers,
2668make sure the string consists of printing characters only.
2669
2670Argument:
2671 port the port to connect to; usually this is IDENT_PORT (113), but when
2672 running in the test harness with -bh a different value is used.
2673
2674Returns: nothing
2675
2676Side effect: any received ident value is put in sender_ident (NULL otherwise)
2677*/
2678
2679void
2680verify_get_ident(int port)
2681{
2682int sock, host_af, qlen;
2683int received_sender_port, received_interface_port, n;
2684uschar *p;
44e6c20c 2685blob early_data;
059ec3d9
PH
2686uschar buffer[2048];
2687
2688/* Default is no ident. Check whether we want to do an ident check for this
2689host. */
2690
2691sender_ident = NULL;
2692if (rfc1413_query_timeout <= 0 || verify_check_host(&rfc1413_hosts) != OK)
2693 return;
2694
2695DEBUG(D_ident) debug_printf("doing ident callback\n");
2696
2697/* Set up a connection to the ident port of the remote host. Bind the local end
2698to the incoming interface address. If the sender host address is an IPv6
2699address, the incoming interface address will also be IPv6. */
2700
fb05276a
JH
2701host_af = Ustrchr(sender_host_address, ':') == NULL ? AF_INET : AF_INET6;
2702if ((sock = ip_socket(SOCK_STREAM, host_af)) < 0) return;
059ec3d9
PH
2703
2704if (ip_bind(sock, host_af, interface_address, 0) < 0)
2705 {
2706 DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n",
2707 strerror(errno));
2708 goto END_OFF;
2709 }
2710
44e6c20c
JH
2711/* Construct and send the query. */
2712
2713qlen = snprintf(CS buffer, sizeof(buffer), "%d , %d\r\n",
2714 sender_host_port, interface_port);
2715early_data.data = buffer;
2716early_data.len = qlen;
2717
fb05276a 2718if (ip_connect(sock, host_af, sender_host_address, port,
44e6c20c 2719 rfc1413_query_timeout, &early_data) < 0)
059ec3d9 2720 {
6c6d6e48 2721 if (errno == ETIMEDOUT && LOGGING(ident_timeout))
059ec3d9
PH
2722 log_write(0, LOG_MAIN, "ident connection to %s timed out",
2723 sender_host_address);
059ec3d9 2724 else
059ec3d9
PH
2725 DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n",
2726 sender_host_address, strerror(errno));
059ec3d9
PH
2727 goto END_OFF;
2728 }
2729
059ec3d9
PH
2730/* Read a response line. We put it into the rest of the buffer, using several
2731recv() calls if necessary. */
2732
2733p = buffer + qlen;
2734
2735for (;;)
2736 {
2737 uschar *pp;
2738 int count;
2739 int size = sizeof(buffer) - (p - buffer);
2740
2741 if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */
2742 count = ip_recv(sock, p, size, rfc1413_query_timeout);
2743 if (count <= 0) goto END_OFF; /* Read error or EOF */
2744
2745 /* Scan what we just read, to see if we have reached the terminating \r\n. Be
2746 generous, and accept a plain \n terminator as well. The only illegal
2747 character is 0. */
2748
2749 for (pp = p; pp < p + count; pp++)
2750 {
2751 if (*pp == 0) goto END_OFF; /* Zero octet not allowed */
2752 if (*pp == '\n')
2753 {
2754 if (pp[-1] == '\r') pp--;
2755 *pp = 0;
2756 goto GOT_DATA; /* Break out of both loops */
2757 }
2758 }
2759
2760 /* Reached the end of the data without finding \n. Let the loop continue to
2761 read some more, if there is room. */
2762
2763 p = pp;
2764 }
2765
2766GOT_DATA:
2767
2768/* We have received a line of data. Check it carefully. It must start with the
2769same two port numbers that we sent, followed by data as defined by the RFC. For
2770example,
2771
2772 12345 , 25 : USERID : UNIX :root
2773
2774However, the amount of white space may be different to what we sent. In the
2775"osname" field there may be several sub-fields, comma separated. The data we
2776actually want to save follows the third colon. Some systems put leading spaces
2777in it - we discard those. */
2778
2779if (sscanf(CS buffer + qlen, "%d , %d%n", &received_sender_port,
2780 &received_interface_port, &n) != 2 ||
2781 received_sender_port != sender_host_port ||
2782 received_interface_port != interface_port)
2783 goto END_OFF;
2784
2785p = buffer + qlen + n;
2786while(isspace(*p)) p++;
2787if (*p++ != ':') goto END_OFF;
2788while(isspace(*p)) p++;
2789if (Ustrncmp(p, "USERID", 6) != 0) goto END_OFF;
2790p += 6;
2791while(isspace(*p)) p++;
2792if (*p++ != ':') goto END_OFF;
2793while (*p != 0 && *p != ':') p++;
2794if (*p++ == 0) goto END_OFF;
2795while(isspace(*p)) p++;
2796if (*p == 0) goto END_OFF;
2797
2798/* The rest of the line is the data we want. We turn it into printing
2799characters when we save it, so that it cannot mess up the format of any logging
2800or Received: lines into which it gets inserted. We keep a maximum of 127
55414b25 2801characters. The deconst cast is ok as we fed a nonconst to string_printing() */
059ec3d9 2802
55414b25 2803sender_ident = US string_printing(string_copyn(p, 127));
059ec3d9
PH
2804DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident);
2805
2806END_OFF:
f1e894f3 2807(void)close(sock);
059ec3d9
PH
2808return;
2809}
2810
2811
2812
2813
2814/*************************************************
2815* Match host to a single host-list item *
2816*************************************************/
2817
2818/* This function compares a host (name or address) against a single item
2819from a host list. The host name gets looked up if it is needed and is not
2820already known. The function is called from verify_check_this_host() via
2821match_check_list(), which is why most of its arguments are in a single block.
2822
2823Arguments:
2824 arg the argument block (see below)
2825 ss the host-list item
2826 valueptr where to pass back looked up data, or NULL
2827 error for error message when returning ERROR
2828
2829The block contains:
32d668a5
PH
2830 host_name (a) the host name, or
2831 (b) NULL, implying use sender_host_name and
2832 sender_host_aliases, looking them up if required, or
2833 (c) the empty string, meaning that only IP address matches
2834 are permitted
059ec3d9
PH
2835 host_address the host address
2836 host_ipv4 the IPv4 address taken from an IPv6 one
2837
2838Returns: OK matched
2839 FAIL did not match
2840 DEFER lookup deferred
32d668a5
PH
2841 ERROR (a) failed to find the host name or IP address, or
2842 (b) unknown lookup type specified, or
2843 (c) host name encountered when only IP addresses are
2844 being matched
059ec3d9
PH
2845*/
2846
32d668a5 2847int
55414b25 2848check_host(void *arg, const uschar *ss, const uschar **valueptr, uschar **error)
059ec3d9
PH
2849{
2850check_host_block *cb = (check_host_block *)arg;
32d668a5 2851int mlen = -1;
059ec3d9 2852int maskoffset;
32d668a5 2853BOOL iplookup = FALSE;
059ec3d9 2854BOOL isquery = FALSE;
32d668a5 2855BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0;
55414b25 2856const uschar *t;
32d668a5 2857uschar *semicolon;
059ec3d9
PH
2858uschar **aliases;
2859
2860/* Optimize for the special case when the pattern is "*". */
2861
2862if (*ss == '*' && ss[1] == 0) return OK;
2863
2864/* If the pattern is empty, it matches only in the case when there is no host -
2865this can occur in ACL checking for SMTP input using the -bs option. In this
2866situation, the host address is the empty string. */
2867
2868if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL;
2869if (*ss == 0) return FAIL;
2870
32d668a5
PH
2871/* If the pattern is precisely "@" then match against the primary host name,
2872provided that host name matching is permitted; if it's "@[]" match against the
2873local host's IP addresses. */
059ec3d9
PH
2874
2875if (*ss == '@')
2876 {
32d668a5
PH
2877 if (ss[1] == 0)
2878 {
2879 if (isiponly) return ERROR;
2880 ss = primary_hostname;
2881 }
059ec3d9
PH
2882 else if (Ustrcmp(ss, "@[]") == 0)
2883 {
2884 ip_address_item *ip;
2885 for (ip = host_find_interfaces(); ip != NULL; ip = ip->next)
2886 if (Ustrcmp(ip->address, cb->host_address) == 0) return OK;
2887 return FAIL;
2888 }
2889 }
2890
2891/* If the pattern is an IP address, optionally followed by a bitmask count, do
4c04137d 2892a (possibly masked) comparison with the current IP address. */
059ec3d9 2893
7e66e54d 2894if (string_is_ip_address(ss, &maskoffset) != 0)
059ec3d9
PH
2895 return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL);
2896
1688f43b
PH
2897/* The pattern is not an IP address. A common error that people make is to omit
2898one component of an IPv4 address, either by accident, or believing that, for
2899example, 1.2.3/24 is the same as 1.2.3.0/24, or 1.2.3 is the same as 1.2.3.0,
2900which it isn't. (Those applications that do accept 1.2.3 as an IP address
2901interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an
2902ancient specification.) To aid in debugging these cases, we give a specific
2903error if the pattern contains only digits and dots or contains a slash preceded
2904only by digits and dots (a slash at the start indicates a file name and of
2905course slashes may be present in lookups, but not preceded only by digits and
2906dots). */
2907
2908for (t = ss; isdigit(*t) || *t == '.'; t++);
2909if (*t == 0 || (*t == '/' && t != ss))
2910 {
2911 *error = US"malformed IPv4 address or address mask";
2912 return ERROR;
2913 }
2914
32d668a5 2915/* See if there is a semicolon in the pattern */
059ec3d9 2916
32d668a5
PH
2917semicolon = Ustrchr(ss, ';');
2918
2919/* If we are doing an IP address only match, then all lookups must be IP
df199fec 2920address lookups, even if there is no "net-". */
32d668a5
PH
2921
2922if (isiponly)
059ec3d9 2923 {
32d668a5
PH
2924 iplookup = semicolon != NULL;
2925 }
059ec3d9 2926
32d668a5 2927/* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is
df199fec
PH
2928a lookup on a masked IP network, in textual form. We obey this code even if we
2929have already set iplookup, so as to skip over the "net-" prefix and to set the
2930mask length. The net- stuff really only applies to single-key lookups where the
2931key is implicit. For query-style lookups the key is specified in the query.
2932From release 4.30, the use of net- for query style is no longer needed, but we
2933retain it for backward compatibility. */
2934
2935if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL)
32d668a5
PH
2936 {
2937 mlen = 0;
2938 for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0';
2939 if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */
2940 iplookup = (*t++ == '-');
2941 }
1688f43b 2942else t = ss;
059ec3d9 2943
32d668a5 2944/* Do the IP address lookup if that is indeed what we have */
059ec3d9 2945
32d668a5
PH
2946if (iplookup)
2947 {
2948 int insize;
2949 int search_type;
2950 int incoming[4];
2951 void *handle;
2952 uschar *filename, *key, *result;
2953 uschar buffer[64];
059ec3d9 2954
32d668a5 2955 /* Find the search type */
059ec3d9 2956
32d668a5 2957 search_type = search_findtype(t, semicolon - t);
059ec3d9 2958
32d668a5
PH
2959 if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
2960 search_error_message);
059ec3d9 2961
13b685f9
PH
2962 /* Adjust parameters for the type of lookup. For a query-style lookup, there
2963 is no file name, and the "key" is just the query. For query-style with a file
2964 name, we have to fish the file off the start of the query. For a single-key
2965 lookup, the key is the current IP address, masked appropriately, and
2966 reconverted to text form, with the mask appended. For IPv6 addresses, specify
6a3bceb1
PH
2967 dot separators instead of colons, except when the lookup type is "iplsearch".
2968 */
059ec3d9 2969
13b685f9
PH
2970 if (mac_islookup(search_type, lookup_absfilequery))
2971 {
2972 filename = semicolon + 1;
2973 key = filename;
2974 while (*key != 0 && !isspace(*key)) key++;
2975 filename = string_copyn(filename, key - filename);
2976 while (isspace(*key)) key++;
2977 }
2978 else if (mac_islookup(search_type, lookup_querystyle))
32d668a5
PH
2979 {
2980 filename = NULL;
2981 key = semicolon + 1;
2982 }
6a3bceb1 2983 else /* Single-key style */
32d668a5 2984 {
e6d225ae 2985 int sep = (Ustrcmp(lookup_list[search_type]->name, "iplsearch") == 0)?
6a3bceb1 2986 ':' : '.';
32d668a5
PH
2987 insize = host_aton(cb->host_address, incoming);
2988 host_mask(insize, incoming, mlen);
6a3bceb1 2989 (void)host_nmtoa(insize, incoming, mlen, buffer, sep);
32d668a5
PH
2990 key = buffer;
2991 filename = semicolon + 1;
059ec3d9 2992 }
32d668a5
PH
2993
2994 /* Now do the actual lookup; note that there is no search_close() because
2995 of the caching arrangements. */
2996
d4ff61d1
JH
2997 if (!(handle = search_open(filename, search_type, 0, NULL, NULL)))
2998 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", search_error_message);
2999
32d668a5
PH
3000 result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL);
3001 if (valueptr != NULL) *valueptr = result;
3002 return (result != NULL)? OK : search_find_defer? DEFER: FAIL;
059ec3d9
PH
3003 }
3004
3005/* The pattern is not an IP address or network reference of any kind. That is,
32d668a5
PH
3006it is a host name pattern. If this is an IP only match, there's an error in the
3007host list. */
3008
3009if (isiponly)
3010 {
3011 *error = US"cannot match host name in match_ip list";
3012 return ERROR;
3013 }
3014
3015/* Check the characters of the pattern to see if they comprise only letters,
3016digits, full stops, and hyphens (the constituents of domain names). Allow
3017underscores, as they are all too commonly found. Sigh. Also, if
3018allow_utf8_domains is set, allow top-bit characters. */
059ec3d9
PH
3019
3020for (t = ss; *t != 0; t++)
3021 if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' &&
3022 (!allow_utf8_domains || *t < 128)) break;
3023
3024/* If the pattern is a complete domain name, with no fancy characters, look up
3025its IP address and match against that. Note that a multi-homed host will add
3026items to the chain. */
3027
3028if (*t == 0)
3029 {
3030 int rc;
3031 host_item h;
3032 h.next = NULL;
3033 h.name = ss;
3034 h.address = NULL;
3035 h.mx = MX_NONE;
9b8fadde 3036
1f155f8e
JH
3037 /* Using byname rather than bydns here means we cannot determine dnssec
3038 status. On the other hand it is unclear how that could be either
3039 propagated up or enforced. */
3040
322050c2 3041 rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE);
059ec3d9
PH
3042 if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
3043 {
3044 host_item *hh;
3045 for (hh = &h; hh != NULL; hh = hh->next)
3046 {
96776534 3047 if (host_is_in_net(hh->address, cb->host_address, 0)) return OK;
059ec3d9
PH
3048 }
3049 return FAIL;
3050 }
3051 if (rc == HOST_FIND_AGAIN) return DEFER;
3052 *error = string_sprintf("failed to find IP address for %s", ss);
3053 return ERROR;
3054 }
3055
3056/* Almost all subsequent comparisons require the host name, and can be done
3057using the general string matching function. When this function is called for
3058outgoing hosts, the name is always given explicitly. If it is NULL, it means we
3059must use sender_host_name and its aliases, looking them up if necessary. */
3060
3061if (cb->host_name != NULL) /* Explicit host name given */
3062 return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE,
3063 valueptr);
3064
3065/* Host name not given; in principle we need the sender host name and its
3066aliases. However, for query-style lookups, we do not need the name if the
3067query does not contain $sender_host_name. From release 4.23, a reference to
3068$sender_host_name causes it to be looked up, so we don't need to do the lookup
3069on spec. */
3070
3071if ((semicolon = Ustrchr(ss, ';')) != NULL)
3072 {
55414b25 3073 const uschar *affix;
059ec3d9
PH
3074 int partial, affixlen, starflags, id;
3075
3076 *semicolon = 0;
3077 id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags);
3078 *semicolon=';';
3079
3080 if (id < 0) /* Unknown lookup type */
3081 {
3082 log_write(0, LOG_MAIN|LOG_PANIC, "%s in host list item \"%s\"",
3083 search_error_message, ss);
3084 return DEFER;
3085 }
13b685f9 3086 isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery);
059ec3d9
PH
3087 }
3088
3089if (isquery)
3090 {
3091 switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr))
3092 {
3093 case OK: return OK;
3094 case DEFER: return DEFER;
3095 default: return FAIL;
3096 }
3097 }
3098
3099/* Not a query-style lookup; must ensure the host name is present, and then we
3100do a check on the name and all its aliases. */
3101
2d0dc929 3102if (!sender_host_name)
059ec3d9
PH
3103 {
3104 HDEBUG(D_host_lookup)
3105 debug_printf("sender host name required, to match against %s\n", ss);
3106 if (host_lookup_failed || host_name_lookup() != OK)
3107 {
3108 *error = string_sprintf("failed to find host name for %s",
3109 sender_host_address);;
3110 return ERROR;
3111 }
3112 host_build_sender_fullhost();
3113 }
3114
3115/* Match on the sender host name, using the general matching function */
3116
2d0dc929 3117switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE, valueptr))
059ec3d9
PH
3118 {
3119 case OK: return OK;
3120 case DEFER: return DEFER;
3121 }
3122
3123/* If there are aliases, try matching on them. */
3124
3125aliases = sender_host_aliases;
2d0dc929 3126while (*aliases)
059ec3d9
PH
3127 switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr))
3128 {
3129 case OK: return OK;
3130 case DEFER: return DEFER;
3131 }
059ec3d9
PH
3132return FAIL;
3133}
3134
3135
3136
3137
3138/*************************************************
3139* Check a specific host matches a host list *
3140*************************************************/
3141
3142/* This function is passed a host list containing items in a number of
3143different formats and the identity of a host. Its job is to determine whether
3144the given host is in the set of hosts defined by the list. The host name is
3145passed as a pointer so that it can be looked up if needed and not already
3146known. This is commonly the case when called from verify_check_host() to check
3147an incoming connection. When called from elsewhere the host name should usually
3148be set.
3149
3150This function is now just a front end to match_check_list(), which runs common
3151code for scanning a list. We pass it the check_host() function to perform a
3152single test.
3153
3154Arguments:
3155 listptr pointer to the host list
3156 cache_bits pointer to cache for named lists, or NULL
3157 host_name the host name or NULL, implying use sender_host_name and
3158 sender_host_aliases, looking them up if required
3159 host_address the IP address
3160 valueptr if not NULL, data from a lookup is passed back here
3161
3162Returns: OK if the host is in the defined set
3163 FAIL if the host is not in the defined set,
3164 DEFER if a data lookup deferred (not a host lookup)
3165
3166If the host name was needed in order to make a comparison, and could not be
3167determined from the IP address, the result is FAIL unless the item
3168"+allow_unknown" was met earlier in the list, in which case OK is returned. */
3169
3170int
55414b25
JH
3171verify_check_this_host(const uschar **listptr, unsigned int *cache_bits,
3172 const uschar *host_name, const uschar *host_address, const uschar **valueptr)
059ec3d9 3173{
d4eb88df 3174int rc;
059ec3d9 3175unsigned int *local_cache_bits = cache_bits;
55414b25 3176const uschar *save_host_address = deliver_host_address;
0ab63f3d 3177check_host_block cb = { .host_name = host_name, .host_address = host_address };
059ec3d9 3178
0ab63f3d 3179if (valueptr) *valueptr = NULL;
059ec3d9
PH
3180
3181/* If the host address starts off ::ffff: it is an IPv6 address in
3182IPv4-compatible mode. Find the IPv4 part for checking against IPv4
3183addresses. */
3184
0ab63f3d
JH
3185cb.host_ipv4 = Ustrncmp(host_address, "::ffff:", 7) == 0
3186 ? host_address + 7 : host_address;
059ec3d9 3187
8e669ac1
PH
3188/* During the running of the check, put the IP address into $host_address. In
3189the case of calls from the smtp transport, it will already be there. However,
3190in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
d4eb88df
PH
3191the safe side, any existing setting is preserved, though as I write this
3192(November 2004) I can't see any cases where it is actually needed. */
3193
3194deliver_host_address = host_address;
3195rc = match_check_list(
3196 listptr, /* the list */
3197 0, /* separator character */
3198 &hostlist_anchor, /* anchor pointer */
3199 &local_cache_bits, /* cache pointer */
3200 check_host, /* function for testing */
3201 &cb, /* argument for function */
3202 MCL_HOST, /* type of check */
8e669ac1 3203 (host_address == sender_host_address)?
d4eb88df
PH
3204 US"host" : host_address, /* text for debugging */
3205 valueptr); /* where to pass back data */
3206deliver_host_address = save_host_address;
8e669ac1 3207return rc;
059ec3d9
PH
3208}
3209
3210
3211
3212
3213/*************************************************
5130845b
JH
3214* Check the given host item matches a list *
3215*************************************************/
3216int
3217verify_check_given_host(uschar **listptr, host_item *host)
3218{
55414b25 3219return verify_check_this_host(CUSS listptr, NULL, host->name, host->address, NULL);
5130845b
JH
3220}
3221
3222/*************************************************
059ec3d9
PH
3223* Check the remote host matches a list *
3224*************************************************/
3225
3226/* This is a front end to verify_check_this_host(), created because checking
3227the remote host is a common occurrence. With luck, a good compiler will spot
3228the tail recursion and optimize it. If there's no host address, this is
3229command-line SMTP input - check against an empty string for the address.
3230
3231Arguments:
3232 listptr pointer to the host list
3233
3234Returns: the yield of verify_check_this_host(),
3235 i.e. OK, FAIL, or DEFER
3236*/
3237
3238int
3239verify_check_host(uschar **listptr)
3240{
55414b25 3241return verify_check_this_host(CUSS listptr, sender_host_cache, NULL,
059ec3d9
PH
3242 (sender_host_address == NULL)? US"" : sender_host_address, NULL);
3243}
3244
3245
3246
3247
3248
3249/*************************************************
83e029d5 3250* Invert an IP address *
059ec3d9
PH
3251*************************************************/
3252
83e029d5
PP
3253/* Originally just used for DNS xBL lists, now also used for the
3254reverse_ip expansion operator.
3255
059ec3d9
PH
3256Arguments:
3257 buffer where to put the answer
3258 address the address to invert
3259*/
3260
83e029d5 3261void
059ec3d9
PH
3262invert_address(uschar *buffer, uschar *address)
3263{
3264int bin[4];
3265uschar *bptr = buffer;
3266
3267/* If this is an IPv4 address mapped into IPv6 format, adjust the pointer
3268to the IPv4 part only. */
3269
3270if (Ustrncmp(address, "::ffff:", 7) == 0) address += 7;
3271
3272/* Handle IPv4 address: when HAVE_IPV6 is false, the result of host_aton() is
3273always 1. */
3274
3275if (host_aton(address, bin) == 1)
3276 {
3277 int i;
3278 int x = bin[0];
3279 for (i = 0; i < 4; i++)
3280 {
3281 sprintf(CS bptr, "%d.", x & 255);
3282 while (*bptr) bptr++;
3283 x >>= 8;
3284 }
3285 }
3286
3287/* Handle IPv6 address. Actually, as far as I know, there are no IPv6 addresses
3288in any DNS black lists, and the format in which they will be looked up is
3289unknown. This is just a guess. */
3290
3291#if HAVE_IPV6
3292else
3293 {
3294 int i, j;
3295 for (j = 3; j >= 0; j--)
3296 {
3297 int x = bin[j];
3298 for (i = 0; i < 8; i++)
3299 {
3300 sprintf(CS bptr, "%x.", x & 15);
3301 while (*bptr) bptr++;
3302 x >>= 4;
3303 }
3304 }
3305 }
3306#endif
d6f6e0dc
PH
3307
3308/* Remove trailing period -- this is needed so that both arbitrary
3309dnsbl keydomains and inverted addresses may be combined with the
3310same format string, "%s.%s" */
3311
3312*(--bptr) = 0;
059ec3d9
PH
3313}
3314
3315
3316
3317/*************************************************
0bcb2a0e
PH
3318* Perform a single dnsbl lookup *
3319*************************************************/
3320
d6f6e0dc
PH
3321/* This function is called from verify_check_dnsbl() below. It is also called
3322recursively from within itself when domain and domain_txt are different
3323pointers, in order to get the TXT record from the alternate domain.
0bcb2a0e
PH
3324
3325Arguments:
d6f6e0dc
PH
3326 domain the outer dnsbl domain
3327 domain_txt alternate domain to lookup TXT record on success; when the
3328 same domain is to be used, domain_txt == domain (that is,
3329 the pointers must be identical, not just the text)
8e669ac1 3330 keydomain the current keydomain (for debug message)
d6f6e0dc
PH
3331 prepend subdomain to lookup (like keydomain, but
3332 reversed if IP address)
3333 iplist the list of matching IP addresses, or NULL for "any"
8e669ac1 3334 bitmask true if bitmask matching is wanted
431b7361
PH
3335 match_type condition for 'succeed' result
3336 0 => Any RR in iplist (=)
3337 1 => No RR in iplist (!=)
3338 2 => All RRs in iplist (==)
3339 3 => Some RRs not in iplist (!==)
3340 the two bits are defined as MT_NOT and MT_ALL
8e669ac1 3341 defer_return what to return for a defer
0bcb2a0e
PH
3342
3343Returns: OK if lookup succeeded
3344 FAIL if not
3345*/
3346
3347static int
d6f6e0dc 3348one_check_dnsbl(uschar *domain, uschar *domain_txt, uschar *keydomain,
431b7361 3349 uschar *prepend, uschar *iplist, BOOL bitmask, int match_type,
d6f6e0dc 3350 int defer_return)
8e669ac1 3351{
0bcb2a0e
PH
3352dns_answer dnsa;
3353dns_scan dnss;
3354tree_node *t;
3355dnsbl_cache_block *cb;
3356int old_pool = store_pool;
d6f6e0dc
PH
3357uschar query[256]; /* DNS domain max length */
3358
3359/* Construct the specific query domainname */
3360
3361if (!string_format(query, sizeof(query), "%s.%s", prepend, domain))
3362 {
3363 log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
3364 "(ignored): %s...", query);
3365 return FAIL;
3366 }
0bcb2a0e
PH
3367
3368/* Look for this query in the cache. */
3369
14b3c5bc
JH
3370if ( (t = tree_search(dnsbl_cache, query))
3371 && (cb = t->data.ptr)->expiry > time(NULL)
3372 )
3373
3374/* Previous lookup was cached */
3375
3376 {
3377 HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n");
3378 }
0bcb2a0e
PH
3379
3380/* If not cached from a previous lookup, we must do a DNS lookup, and
3381cache the result in permanent memory. */
3382
14b3c5bc 3383else
0bcb2a0e 3384 {
e162fc97 3385 uint ttl = 3600;
14b3c5bc 3386
0bcb2a0e
PH
3387 store_pool = POOL_PERM;
3388
14b3c5bc
JH
3389 if (t)
3390 {
3391 HDEBUG(D_dnsbl) debug_printf("cached data found but past valid time; ");
3392 }
0bcb2a0e 3393
14b3c5bc
JH
3394 else
3395 { /* Set up a tree entry to cache the lookup */
3396 t = store_get(sizeof(tree_node) + Ustrlen(query));
3397 Ustrcpy(t->name, query);
3398 t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block));
3399 (void)tree_insertnode(&dnsbl_cache, t);
3400 }
0bcb2a0e 3401
4c04137d 3402 /* Do the DNS lookup . */
0bcb2a0e
PH
3403
3404 HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query);
3405 cb->rc = dns_basic_lookup(&dnsa, query, T_A);
3406 cb->text_set = FALSE;
3407 cb->text = NULL;
3408 cb->rhs = NULL;
3409
3410 /* If the lookup succeeded, cache the RHS address. The code allows for
3411 more than one address - this was for complete generality and the possible
3412 use of A6 records. However, A6 records have been reduced to experimental
3413 status (August 2001) and may die out. So they may never get used at all,
3414 let alone in dnsbl records. However, leave the code here, just in case.
3415
3416 Quite apart from one A6 RR generating multiple addresses, there are DNS
3417 lists that return more than one A record, so we must handle multiple
e162fc97
JH
3418 addresses generated in that way as well.
3419
3420 Mark the cache entry with the "now" plus the minimum of the address TTLs,
3421 or some suitably far-future time if none were found. */
0bcb2a0e
PH
3422
3423 if (cb->rc == DNS_SUCCEED)
3424 {
3425 dns_record *rr;
3426 dns_address **addrp = &(cb->rhs);
3427 for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
e1a3f32f 3428 rr;
0bcb2a0e 3429 rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
0bcb2a0e
PH
3430 if (rr->type == T_A)
3431 {
3432 dns_address *da = dns_address_from_rr(&dnsa, rr);
e1a3f32f 3433 if (da)
0bcb2a0e
PH
3434 {
3435 *addrp = da;
2d0dc929
JH
3436 while (da->next) da = da->next;
3437 addrp = &da->next;
14b3c5bc 3438 if (ttl > rr->ttl) ttl = rr->ttl;
0bcb2a0e
PH
3439 }
3440 }
0bcb2a0e
PH
3441
3442 /* If we didn't find any A records, change the return code. This can
3443 happen when there is a CNAME record but there are no A records for what
3444 it points to. */
3445
2d0dc929 3446 if (!cb->rhs) cb->rc = DNS_NODATA;
0bcb2a0e
PH
3447 }
3448
14b3c5bc 3449 cb->expiry = time(NULL)+ttl;
0bcb2a0e
PH
3450 store_pool = old_pool;
3451 }
3452
0bcb2a0e
PH
3453/* We now have the result of the DNS lookup, either newly done, or cached
3454from a previous call. If the lookup succeeded, check against the address
3455list if there is one. This may be a positive equality list (introduced by
3456"="), a negative equality list (introduced by "!="), a positive bitmask
3457list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/
3458
3459if (cb->rc == DNS_SUCCEED)
3460 {
3461 dns_address *da = NULL;
3462 uschar *addlist = cb->rhs->address;
3463
3464 /* For A and AAAA records, there may be multiple addresses from multiple
3465 records. For A6 records (currently not expected to be used) there may be
3466 multiple addresses from a single record. */
3467
2d0dc929 3468 for (da = cb->rhs->next; da; da = da->next)
0bcb2a0e
PH
3469 addlist = string_sprintf("%s, %s", addlist, da->address);
3470
3471 HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n",
3472 query, addlist);
3473
3474 /* Address list check; this can be either for equality, or via a bitmask.
3475 In the latter case, all the bits must match. */
3476
2d0dc929 3477 if (iplist)
0bcb2a0e 3478 {
2d0dc929 3479 for (da = cb->rhs; da; da = da->next)
0bcb2a0e 3480 {
431b7361
PH
3481 int ipsep = ',';
3482 uschar ip[46];
55414b25 3483 const uschar *ptr = iplist;
431b7361
PH
3484 uschar *res;
3485
0bcb2a0e 3486 /* Handle exact matching */
431b7361 3487
0bcb2a0e 3488 if (!bitmask)
2d0dc929
JH
3489 {
3490 while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))))
3491 if (Ustrcmp(CS da->address, ip) == 0)
3492 break;
3493 }
431b7361 3494
0bcb2a0e 3495 /* Handle bitmask matching */
431b7361 3496
0bcb2a0e
PH
3497 else
3498 {
3499 int address[4];
3500 int mask = 0;
3501
3502 /* At present, all known DNS blocking lists use A records, with
3503