Revert "Show the DNSSEC status (ad=) always in -bt/-bv output"
[exim.git] / src / src / verify.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2015 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 /* Functions concerned with verifying things. The original code for callout
9 caching was contributed by Kevin Fleming (but I hacked it around a bit). */
10
11
12 #include "exim.h"
13 #include "transports/smtp.h"
14
15 #define CUTTHROUGH_CMD_TIMEOUT 30 /* timeout for cutthrough-routing calls */
16 #define CUTTHROUGH_DATA_TIMEOUT 60 /* timeout for cutthrough-routing calls */
17 static smtp_outblock ctblock;
18 uschar ctbuffer[8192];
19
20
21 /* Structure for caching DNSBL lookups */
22
23 typedef struct dnsbl_cache_block {
24 dns_address *rhs;
25 uschar *text;
26 int rc;
27 BOOL text_set;
28 } dnsbl_cache_block;
29
30
31 /* Anchor for DNSBL cache */
32
33 static tree_node *dnsbl_cache = NULL;
34
35
36 /* Bits for match_type in one_check_dnsbl() */
37
38 #define MT_NOT 1
39 #define MT_ALL 2
40
41 static uschar cutthrough_response(char, uschar **);
42
43
44 /*************************************************
45 * Retrieve a callout cache record *
46 *************************************************/
47
48 /* If a record exists, check whether it has expired.
49
50 Arguments:
51 dbm_file an open hints file
52 key the record key
53 type "address" or "domain"
54 positive_expire expire time for positive records
55 negative_expire expire time for negative records
56
57 Returns: the cache record if a non-expired one exists, else NULL
58 */
59
60 static dbdata_callout_cache *
61 get_callout_cache_record(open_db *dbm_file, const uschar *key, uschar *type,
62 int positive_expire, int negative_expire)
63 {
64 BOOL negative;
65 int length, expire;
66 time_t now;
67 dbdata_callout_cache *cache_record;
68
69 cache_record = dbfn_read_with_length(dbm_file, key, &length);
70
71 if (cache_record == NULL)
72 {
73 HDEBUG(D_verify) debug_printf("callout cache: no %s record found for %s\n", type, key);
74 return NULL;
75 }
76
77 /* We treat a record as "negative" if its result field is not positive, or if
78 it is a domain record and the postmaster field is negative. */
79
80 negative = cache_record->result != ccache_accept ||
81 (type[0] == 'd' && cache_record->postmaster_result == ccache_reject);
82 expire = negative? negative_expire : positive_expire;
83 now = time(NULL);
84
85 if (now - cache_record->time_stamp > expire)
86 {
87 HDEBUG(D_verify) debug_printf("callout cache: %s record expired for %s\n", type, key);
88 return NULL;
89 }
90
91 /* If this is a non-reject domain record, check for the obsolete format version
92 that doesn't have the postmaster and random timestamps, by looking at the
93 length. If so, copy it to a new-style block, replicating the record's
94 timestamp. Then check the additional timestamps. (There's no point wasting
95 effort if connections are rejected.) */
96
97 if (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
114 HDEBUG(D_verify) debug_printf("callout cache: found %s record for %s\n", type, key);
115 return cache_record;
116 }
117
118
119
120 /*************************************************
121 * Do callout verification for an address *
122 *************************************************/
123
124 /* This function is called from verify_address() when the address has routed to
125 a host list, and a callout has been requested. Callouts are expensive; that is
126 why a cache is used to improve the efficiency.
127
128 Arguments:
129 addr the address that's been routed
130 host_list the list of hosts to try
131 tf the transport feedback block
132
133 ifstring "interface" option from transport, or NULL
134 portstring "port" option from transport, or NULL
135 protocolstring "protocol" option from transport, or NULL
136 callout the per-command callout timeout
137 callout_overall the overall callout timeout (if < 0 use 4*callout)
138 callout_connect the callout connection timeout (if < 0 use callout)
139 options the verification options - these bits are used:
140 vopt_is_recipient => this is a recipient address
141 vopt_callout_no_cache => don't use callout cache
142 vopt_callout_fullpm => if postmaster check, do full one
143 vopt_callout_random => do the "random" thing
144 vopt_callout_recipsender => use real sender for recipient
145 vopt_callout_recippmaster => use postmaster for recipient
146 se_mailfrom MAIL FROM address for sender verify; NULL => ""
147 pm_mailfrom if non-NULL, do the postmaster check with this sender
148
149 Returns: OK/FAIL/DEFER
150 */
151
152 static int
153 do_callout(address_item *addr, host_item *host_list, transport_feedback *tf,
154 int callout, int callout_overall, int callout_connect, int options,
155 uschar *se_mailfrom, uschar *pm_mailfrom)
156 {
157 BOOL is_recipient = (options & vopt_is_recipient) != 0;
158 BOOL callout_no_cache = (options & vopt_callout_no_cache) != 0;
159 BOOL callout_random = (options & vopt_callout_random) != 0;
160
161 int yield = OK;
162 int old_domain_cache_result = ccache_accept;
163 BOOL done = FALSE;
164 uschar *address_key;
165 uschar *from_address;
166 uschar *random_local_part = NULL;
167 const uschar *save_deliver_domain = deliver_domain;
168 uschar **failure_ptr = is_recipient?
169 &recipient_verify_failure : &sender_verify_failure;
170 open_db dbblock;
171 open_db *dbm_file = NULL;
172 dbdata_callout_cache new_domain_record;
173 dbdata_callout_cache_address new_address_record;
174 host_item *host;
175 time_t callout_start_time;
176 #ifdef EXPERIMENTAL_INTERNATIONAL
177 BOOL utf8_offered = FALSE;
178 #endif
179
180 new_domain_record.result = ccache_unknown;
181 new_domain_record.postmaster_result = ccache_unknown;
182 new_domain_record.random_result = ccache_unknown;
183
184 memset(&new_address_record, 0, sizeof(new_address_record));
185
186 /* For a recipient callout, the key used for the address cache record must
187 include the sender address if we are using the real sender in the callout,
188 because that may influence the result of the callout. */
189
190 address_key = addr->address;
191 from_address = US"";
192
193 if (is_recipient)
194 {
195 if (options & vopt_callout_recipsender)
196 {
197 address_key = string_sprintf("%s/<%s>", addr->address, sender_address);
198 from_address = sender_address;
199 }
200 else if (options & vopt_callout_recippmaster)
201 {
202 address_key = string_sprintf("%s/<postmaster@%s>", addr->address,
203 qualify_domain_sender);
204 from_address = string_sprintf("postmaster@%s", qualify_domain_sender);
205 }
206 }
207
208 /* For a sender callout, we must adjust the key if the mailfrom address is not
209 empty. */
210
211 else
212 {
213 from_address = (se_mailfrom == NULL)? US"" : se_mailfrom;
214 if (from_address[0] != 0)
215 address_key = string_sprintf("%s/<%s>", addr->address, from_address);
216 }
217
218 /* Open the callout cache database, it it exists, for reading only at this
219 stage, unless caching has been disabled. */
220
221 if (callout_no_cache)
222 {
223 HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n");
224 }
225 else if ((dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE)) == NULL)
226 {
227 HDEBUG(D_verify) debug_printf("callout cache: not available\n");
228 }
229
230 /* If a cache database is available see if we can avoid the need to do an
231 actual callout by making use of previously-obtained data. */
232
233 if (dbm_file != NULL)
234 {
235 dbdata_callout_cache_address *cache_address_record;
236 dbdata_callout_cache *cache_record = get_callout_cache_record(dbm_file,
237 addr->domain, US"domain",
238 callout_cache_domain_positive_expire,
239 callout_cache_domain_negative_expire);
240
241 /* If an unexpired cache record was found for this domain, see if the callout
242 process can be short-circuited. */
243
244 if (cache_record != NULL)
245 {
246 /* In most cases, if an early command (up to and including MAIL FROM:<>)
247 was rejected, there is no point carrying on. The callout fails. However, if
248 we are doing a recipient verification with use_sender or use_postmaster
249 set, a previous failure of MAIL FROM:<> doesn't count, because this time we
250 will be using a non-empty sender. We have to remember this situation so as
251 not to disturb the cached domain value if this whole verification succeeds
252 (we don't want it turning into "accept"). */
253
254 old_domain_cache_result = cache_record->result;
255
256 if (cache_record->result == ccache_reject ||
257 (*from_address == 0 && cache_record->result == ccache_reject_mfnull))
258 {
259 setflag(addr, af_verify_nsfail);
260 HDEBUG(D_verify)
261 debug_printf("callout cache: domain gave initial rejection, or "
262 "does not accept HELO or MAIL FROM:<>\n");
263 setflag(addr, af_verify_nsfail);
264 addr->user_message = US"(result of an earlier callout reused).";
265 yield = FAIL;
266 *failure_ptr = US"mail";
267 goto END_CALLOUT;
268 }
269
270 /* If a previous check on a "random" local part was accepted, we assume
271 that the server does not do any checking on local parts. There is therefore
272 no point in doing the callout, because it will always be successful. If a
273 random check previously failed, arrange not to do it again, but preserve
274 the data in the new record. If a random check is required but hasn't been
275 done, skip the remaining cache processing. */
276
277 if (callout_random) switch(cache_record->random_result)
278 {
279 case ccache_accept:
280 HDEBUG(D_verify)
281 debug_printf("callout cache: domain accepts random addresses\n");
282 goto END_CALLOUT; /* Default yield is OK */
283
284 case ccache_reject:
285 HDEBUG(D_verify)
286 debug_printf("callout cache: domain rejects random addresses\n");
287 callout_random = FALSE;
288 new_domain_record.random_result = ccache_reject;
289 new_domain_record.random_stamp = cache_record->random_stamp;
290 break;
291
292 default:
293 HDEBUG(D_verify)
294 debug_printf("callout cache: need to check random address handling "
295 "(not cached or cache expired)\n");
296 goto END_CACHE;
297 }
298
299 /* If a postmaster check is requested, but there was a previous failure,
300 there is again no point in carrying on. If a postmaster check is required,
301 but has not been done before, we are going to have to do a callout, so skip
302 remaining cache processing. */
303
304 if (pm_mailfrom != NULL)
305 {
306 if (cache_record->postmaster_result == ccache_reject)
307 {
308 setflag(addr, af_verify_pmfail);
309 HDEBUG(D_verify)
310 debug_printf("callout cache: domain does not accept "
311 "RCPT TO:<postmaster@domain>\n");
312 yield = FAIL;
313 *failure_ptr = US"postmaster";
314 setflag(addr, af_verify_pmfail);
315 addr->user_message = US"(result of earlier verification reused).";
316 goto END_CALLOUT;
317 }
318 if (cache_record->postmaster_result == ccache_unknown)
319 {
320 HDEBUG(D_verify)
321 debug_printf("callout cache: need to check RCPT "
322 "TO:<postmaster@domain> (not cached or cache expired)\n");
323 goto END_CACHE;
324 }
325
326 /* If cache says OK, set pm_mailfrom NULL to prevent a redundant
327 postmaster check if the address itself has to be checked. Also ensure
328 that the value in the cache record is preserved (with its old timestamp).
329 */
330
331 HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT "
332 "TO:<postmaster@domain>\n");
333 pm_mailfrom = NULL;
334 new_domain_record.postmaster_result = ccache_accept;
335 new_domain_record.postmaster_stamp = cache_record->postmaster_stamp;
336 }
337 }
338
339 /* We can't give a result based on information about the domain. See if there
340 is an unexpired cache record for this specific address (combined with the
341 sender address if we are doing a recipient callout with a non-empty sender).
342 */
343
344 cache_address_record = (dbdata_callout_cache_address *)
345 get_callout_cache_record(dbm_file,
346 address_key, US"address",
347 callout_cache_positive_expire,
348 callout_cache_negative_expire);
349
350 if (cache_address_record != NULL)
351 {
352 if (cache_address_record->result == ccache_accept)
353 {
354 HDEBUG(D_verify)
355 debug_printf("callout cache: address record is positive\n");
356 }
357 else
358 {
359 HDEBUG(D_verify)
360 debug_printf("callout cache: address record is negative\n");
361 addr->user_message = US"Previous (cached) callout verification failure";
362 *failure_ptr = US"recipient";
363 yield = FAIL;
364 }
365 goto END_CALLOUT;
366 }
367
368 /* Close the cache database while we actually do the callout for real. */
369
370 END_CACHE:
371 dbfn_close(dbm_file);
372 dbm_file = NULL;
373 }
374
375 if (!addr->transport)
376 {
377 HDEBUG(D_verify) debug_printf("cannot callout via null transport\n");
378 }
379 else if (Ustrcmp(addr->transport->driver_name, "smtp") != 0)
380 log_write(0, LOG_MAIN|LOG_PANIC|LOG_CONFIG_FOR, "callout transport '%s': %s is non-smtp",
381 addr->transport->name, addr->transport->driver_name);
382 else
383 {
384 smtp_transport_options_block *ob =
385 (smtp_transport_options_block *)addr->transport->options_block;
386
387 /* The information wasn't available in the cache, so we have to do a real
388 callout and save the result in the cache for next time, unless no_cache is set,
389 or unless we have a previously cached negative random result. If we are to test
390 with a random local part, ensure that such a local part is available. If not,
391 log the fact, but carry on without randomming. */
392
393 if (callout_random && callout_random_local_part != NULL)
394 if (!(random_local_part = expand_string(callout_random_local_part)))
395 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand "
396 "callout_random_local_part: %s", expand_string_message);
397
398 /* Default the connect and overall callout timeouts if not set, and record the
399 time we are starting so that we can enforce it. */
400
401 if (callout_overall < 0) callout_overall = 4 * callout;
402 if (callout_connect < 0) callout_connect = callout;
403 callout_start_time = time(NULL);
404
405 /* Before doing a real callout, if this is an SMTP connection, flush the SMTP
406 output because a callout might take some time. When PIPELINING is active and
407 there are many recipients, the total time for doing lots of callouts can add up
408 and cause the client to time out. So in this case we forgo the PIPELINING
409 optimization. */
410
411 if (smtp_out != NULL && !disable_callout_flush) mac_smtp_fflush();
412
413 /* cutthrough-multi: if a nonfirst rcpt has the same routing as the first,
414 and we are holding a cutthrough conn open, we can just append the rcpt to
415 that conn for verification purposes (and later delivery also). Simplest
416 coding means skipping this whole loop and doing the append separately.
417
418 We will need to remember it has been appended so that rcpt-acl tail code
419 can do it there for the non-rcpt-verify case. For this we keep an addresscount.
420 */
421
422 /* Can we re-use an open cutthrough connection? */
423 if ( cutthrough.fd >= 0
424 && (options & (vopt_callout_recipsender | vopt_callout_recippmaster))
425 == vopt_callout_recipsender
426 && !random_local_part
427 && !pm_mailfrom
428 )
429 {
430 if (addr->transport == cutthrough.addr.transport)
431 for (host = host_list; host; host = host->next)
432 if (Ustrcmp(host->address, cutthrough.host.address) == 0)
433 {
434 int host_af;
435 uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
436 int port = 25;
437
438 deliver_host = host->name;
439 deliver_host_address = host->address;
440 deliver_host_port = host->port;
441 deliver_domain = addr->domain;
442 transport_name = addr->transport->name;
443
444 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
445
446 if (!smtp_get_interface(tf->interface, host_af, addr, NULL, &interface,
447 US"callout") ||
448 !smtp_get_port(tf->port, addr, &port, US"callout"))
449 log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
450 addr->message);
451
452 if ( ( interface == cutthrough.interface
453 || ( interface
454 && cutthrough.interface
455 && Ustrcmp(interface, cutthrough.interface) == 0
456 ) )
457 && port == cutthrough.host.port
458 )
459 {
460 uschar * resp;
461
462 /* Match! Send the RCPT TO, append the addr, set done */
463 done =
464 smtp_write_command(&ctblock, FALSE, "RCPT TO:<%.1000s>\r\n",
465 transport_rcpt_address(addr,
466 (addr->transport == NULL)? FALSE :
467 addr->transport->rcpt_include_affixes)) >= 0 &&
468 cutthrough_response('2', &resp) == '2';
469
470 /* This would go horribly wrong if a callout fail was ignored by ACL.
471 We punt by abandoning cutthrough on a reject, like the
472 first-rcpt does. */
473
474 if (done)
475 {
476 address_item * na = store_get(sizeof(address_item));
477 *na = cutthrough.addr;
478 cutthrough.addr = *addr;
479 cutthrough.addr.host_used = &cutthrough.host;
480 cutthrough.addr.next = na;
481
482 cutthrough.nrcpt++;
483 }
484 else
485 {
486 cancel_cutthrough_connection("recipient rejected");
487 if (errno == ETIMEDOUT)
488 {
489 HDEBUG(D_verify) debug_printf("SMTP timeout\n");
490 }
491 else if (errno == 0)
492 {
493 if (*resp == 0)
494 Ustrcpy(resp, US"connection dropped");
495
496 addr->message =
497 string_sprintf("response to \"%s\" from %s [%s] was: %s",
498 big_buffer, host->name, host->address,
499 string_printing(resp));
500
501 addr->user_message =
502 string_sprintf("Callout verification failed:\n%s", resp);
503
504 /* Hard rejection ends the process */
505
506 if (resp[0] == '5') /* Address rejected */
507 {
508 yield = FAIL;
509 done = TRUE;
510 }
511 }
512 }
513 }
514 break;
515 }
516 if (!done)
517 cancel_cutthrough_connection("incompatible connection");
518 }
519
520 /* Now make connections to the hosts and do real callouts. The list of hosts
521 is passed in as an argument. */
522
523 for (host = host_list; host != NULL && !done; host = host->next)
524 {
525 smtp_inblock inblock;
526 smtp_outblock outblock;
527 int host_af;
528 int port = 25;
529 BOOL send_quit = TRUE;
530 uschar *active_hostname = smtp_active_hostname;
531 BOOL lmtp;
532 BOOL smtps;
533 BOOL esmtp;
534 BOOL suppress_tls = FALSE;
535 uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
536 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
537 BOOL dane = FALSE;
538 BOOL dane_required;
539 dns_answer tlsa_dnsa;
540 #endif
541 uschar inbuffer[4096];
542 uschar outbuffer[1024];
543 uschar responsebuffer[4096];
544
545 clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
546 clearflag(addr, af_verify_nsfail); /* null sender callout flag */
547
548 /* Skip this host if we don't have an IP address for it. */
549
550 if (host->address == NULL)
551 {
552 DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
553 host->name);
554 continue;
555 }
556
557 /* Check the overall callout timeout */
558
559 if (time(NULL) - callout_start_time >= callout_overall)
560 {
561 HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
562 break;
563 }
564
565 /* Set IPv4 or IPv6 */
566
567 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
568
569 /* Expand and interpret the interface and port strings. The latter will not
570 be used if there is a host-specific port (e.g. from a manualroute router).
571 This has to be delayed till now, because they may expand differently for
572 different hosts. If there's a failure, log it, but carry on with the
573 defaults. */
574
575 deliver_host = host->name;
576 deliver_host_address = host->address;
577 deliver_host_port = host->port;
578 deliver_domain = addr->domain;
579 transport_name = addr->transport->name;
580
581 if ( !smtp_get_interface(tf->interface, host_af, addr, NULL, &interface,
582 US"callout")
583 || !smtp_get_port(tf->port, addr, &port, US"callout")
584 )
585 log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
586 addr->message);
587
588 /* Set HELO string according to the protocol */
589 lmtp= Ustrcmp(tf->protocol, "lmtp") == 0;
590 smtps= Ustrcmp(tf->protocol, "smtps") == 0;
591
592
593 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
594
595 /* Set up the buffer for reading SMTP response packets. */
596
597 inblock.buffer = inbuffer;
598 inblock.buffersize = sizeof(inbuffer);
599 inblock.ptr = inbuffer;
600 inblock.ptrend = inbuffer;
601
602 /* Set up the buffer for holding SMTP commands while pipelining */
603
604 outblock.buffer = outbuffer;
605 outblock.buffersize = sizeof(outbuffer);
606 outblock.ptr = outbuffer;
607 outblock.cmd_count = 0;
608 outblock.authenticating = FALSE;
609
610 /* Connect to the host; on failure, just loop for the next one, but we
611 set the error for the last one. Use the callout_connect timeout. */
612
613 tls_retry_connection:
614
615 /* Reset the parameters of a TLS session */
616 tls_out.cipher = tls_out.peerdn = tls_out.peercert = NULL;
617
618 inblock.sock = outblock.sock =
619 smtp_connect(host, host_af, port, interface, callout_connect,
620 addr->transport);
621 if (inblock.sock < 0)
622 {
623 addr->message = string_sprintf("could not connect to %s [%s]: %s",
624 host->name, host->address, strerror(errno));
625 transport_name = NULL;
626 deliver_host = deliver_host_address = NULL;
627 deliver_domain = save_deliver_domain;
628 continue;
629 }
630
631 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
632 {
633 int rc;
634
635 tls_out.dane_verified = FALSE;
636 tls_out.tlsa_usage = 0;
637
638 dane_required =
639 verify_check_given_host(&ob->hosts_require_dane, host) == OK;
640
641 if (host->dnssec == DS_YES)
642 {
643 if( ( dane_required
644 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
645 )
646 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
647 )
648 return rc;
649 }
650 else if (dane_required)
651 {
652 log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
653 return FAIL;
654 }
655
656 if (dane)
657 ob->tls_tempfail_tryclear = FALSE;
658 }
659 #endif /*DANE*/
660
661 /* Expand the helo_data string to find the host name to use. */
662
663 if (tf->helo_data != NULL)
664 {
665 uschar *s = expand_string(tf->helo_data);
666 if (s == NULL)
667 log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: failed to expand transport's "
668 "helo_data value for callout: %s", addr->address,
669 expand_string_message);
670 else active_hostname = s;
671 }
672
673 /* Wait for initial response, and send HELO. The smtp_write_command()
674 function leaves its command in big_buffer. This is used in error responses.
675 Initialize it in case the connection is rejected. */
676
677 Ustrcpy(big_buffer, "initial connection");
678
679 /* Unless ssl-on-connect, wait for the initial greeting */
680 smtps_redo_greeting:
681
682 #ifdef SUPPORT_TLS
683 if (!smtps || (smtps && tls_out.active >= 0))
684 #endif
685 {
686 if (!(done= smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), '2', callout)))
687 goto RESPONSE_FAILED;
688
689 #ifdef EXPERIMENTAL_EVENT
690 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
691 : host->dnssec==DS_NO ? US"no" : NULL;
692 if (event_raise(addr->transport->event_action,
693 US"smtp:connect", responsebuffer))
694 {
695 lookup_dnssec_authenticated = NULL;
696 /* Logging? Debug? */
697 goto RESPONSE_FAILED;
698 }
699 lookup_dnssec_authenticated = NULL;
700 #endif
701 }
702
703 /* Not worth checking greeting line for ESMTP support */
704 if (!(esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK))
705 DEBUG(D_transport)
706 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
707
708 tls_redo_helo:
709
710 #ifdef SUPPORT_TLS
711 if (smtps && tls_out.active < 0) /* ssl-on-connect, first pass */
712 {
713 tls_offered = TRUE;
714 ob->tls_tempfail_tryclear = FALSE;
715 }
716 else /* all other cases */
717 #endif
718
719 { esmtp_retry:
720
721 if (!(done= smtp_write_command(&outblock, FALSE, "%s %s\r\n",
722 !esmtp? "HELO" : lmtp? "LHLO" : "EHLO", active_hostname) >= 0))
723 goto SEND_FAILED;
724 if (!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), '2', callout))
725 {
726 if (errno != 0 || responsebuffer[0] == 0 || lmtp || !esmtp || tls_out.active >= 0)
727 {
728 done= FALSE;
729 goto RESPONSE_FAILED;
730 }
731 #ifdef SUPPORT_TLS
732 tls_offered = FALSE;
733 #endif
734 esmtp = FALSE;
735 goto esmtp_retry; /* fallback to HELO */
736 }
737
738 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
739 #ifdef SUPPORT_TLS
740 if (esmtp && !suppress_tls && tls_out.active < 0)
741 {
742 if (regex_STARTTLS == NULL) regex_STARTTLS =
743 regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
744
745 tls_offered = pcre_exec(regex_STARTTLS, NULL, CS responsebuffer,
746 Ustrlen(responsebuffer), 0, PCRE_EOPT, NULL, 0) >= 0;
747 }
748 else
749 tls_offered = FALSE;
750 #endif
751 }
752
753 /* If TLS is available on this connection attempt to
754 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
755 send another EHLO - the server may give a different answer in secure mode. We
756 use a separate buffer for reading the response to STARTTLS so that if it is
757 negative, the original EHLO data is available for subsequent analysis, should
758 the client not be required to use TLS. If the response is bad, copy the buffer
759 for error analysis. */
760
761 #ifdef SUPPORT_TLS
762 if ( tls_offered
763 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK
764 && verify_check_given_host(&ob->hosts_verify_avoid_tls, host) != OK
765 )
766 {
767 uschar buffer2[4096];
768 if ( !smtps
769 && !(done= smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") >= 0))
770 goto SEND_FAILED;
771
772 /* If there is an I/O error, transmission of this message is deferred. If
773 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
774 false, we also defer. However, if there is a temporary rejection of STARTTLS
775 and tls_tempfail_tryclear is true, or if there is an outright rejection of
776 STARTTLS, we carry on. This means we will try to send the message in clear,
777 unless the host is in hosts_require_tls (tested below). */
778
779 if (!smtps && !smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
780 ob->command_timeout))
781 {
782 if (errno != 0 || buffer2[0] == 0 ||
783 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
784 {
785 Ustrncpy(responsebuffer, buffer2, sizeof(responsebuffer));
786 done= FALSE;
787 goto RESPONSE_FAILED;
788 }
789 }
790
791 /* STARTTLS accepted or ssl-on-connect: try to negotiate a TLS session. */
792 else
793 {
794 int oldtimeout = ob->command_timeout;
795 int rc;
796
797 tls_negotiate:
798 ob->command_timeout = callout;
799 rc = tls_client_start(inblock.sock, host, addr, addr->transport
800 # ifdef EXPERIMENTAL_DANE
801 , dane ? &tlsa_dnsa : NULL
802 # endif
803 );
804 ob->command_timeout = oldtimeout;
805
806 /* TLS negotiation failed; give an error. Try in clear on a new
807 connection, if the options permit it for this host. */
808 if (rc != OK)
809 {
810 if (rc == DEFER)
811 {
812 (void)close(inblock.sock);
813 # ifdef EXPERIMENTAL_EVENT
814 (void) event_raise(addr->transport->event_action,
815 US"tcp:close", NULL);
816 # endif
817 # ifdef EXPERIMENTAL_DANE
818 if (dane)
819 {
820 if (!dane_required)
821 {
822 log_write(0, LOG_MAIN, "DANE attempt failed;"
823 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
824 host->name, host->address);
825 dane = FALSE;
826 goto tls_negotiate;
827 }
828 }
829 else
830 # endif
831 if ( ob->tls_tempfail_tryclear
832 && !smtps
833 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
834 )
835 {
836 log_write(0, LOG_MAIN, "TLS session failure:"
837 " delivering unencrypted to %s [%s] (not in hosts_require_tls)",
838 host->name, host->address);
839 suppress_tls = TRUE;
840 goto tls_retry_connection;
841 }
842 }
843
844 /*save_errno = ERRNO_TLSFAILURE;*/
845 /*message = US"failure while setting up TLS session";*/
846 send_quit = FALSE;
847 done= FALSE;
848 goto TLS_FAILED;
849 }
850
851 /* TLS session is set up. Copy info for logging. */
852 addr->cipher = tls_out.cipher;
853 addr->peerdn = tls_out.peerdn;
854
855 /* For SMTPS we need to wait for the initial OK response, then do HELO. */
856 if (smtps)
857 goto smtps_redo_greeting;
858
859 /* For STARTTLS we need to redo EHLO */
860 goto tls_redo_helo;
861 }
862 }
863
864 /* If the host is required to use a secure channel, ensure that we have one. */
865 if (tls_out.active < 0)
866 if (
867 # ifdef EXPERIMENTAL_DANE
868 dane ||
869 # endif
870 verify_check_given_host(&ob->hosts_require_tls, host) == OK
871 )
872 {
873 /*save_errno = ERRNO_TLSREQUIRED;*/
874 log_write(0, LOG_MAIN,
875 "H=%s [%s]: a TLS session is required for this host, but %s",
876 host->name, host->address,
877 tls_offered ? "an attempt to start TLS failed"
878 : "the server did not offer TLS support");
879 done= FALSE;
880 goto TLS_FAILED;
881 }
882
883 #endif /*SUPPORT_TLS*/
884
885 done = TRUE; /* so far so good; have response to HELO */
886
887 /*XXX the EHLO response would be analyzed here for IGNOREQUOTA, SIZE, PIPELINING */
888
889 /* For now, transport_filter by cutthrough-delivery is not supported */
890 /* Need proper integration with the proper transport mechanism. */
891 if (cutthrough.delivery)
892 {
893 if (addr->transport->filter_command)
894 {
895 cutthrough.delivery = FALSE;
896 HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of transport filter\n");
897 }
898 #ifndef DISABLE_DKIM
899 if (ob->dkim_domain)
900 {
901 cutthrough.delivery = FALSE;
902 HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of DKIM signing\n");
903 }
904 #endif
905 }
906
907 SEND_FAILED:
908 RESPONSE_FAILED:
909 TLS_FAILED:
910 ;
911 /* Clear down of the TLS, SMTP and TCP layers on error is handled below. */
912
913 /* Failure to accept HELO is cached; this blocks the whole domain for all
914 senders. I/O errors and defer responses are not cached. */
915
916 if (!done)
917 {
918 *failure_ptr = US"mail"; /* At or before MAIL */
919 if (errno == 0 && responsebuffer[0] == '5')
920 {
921 setflag(addr, af_verify_nsfail);
922 new_domain_record.result = ccache_reject;
923 }
924 }
925
926 #ifdef EXPERIMENTAL_INTERNATIONAL
927 else if ( addr->prop.utf8_msg
928 && !addr->prop.utf8_downcvt
929 && !( esmtp
930 && ( regex_UTF8
931 || ( (regex_UTF8 = regex_must_compile(
932 US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE)),
933 TRUE
934 ) )
935 && ( (utf8_offered = pcre_exec(regex_UTF8, NULL,
936 CS responsebuffer, Ustrlen(responsebuffer),
937 0, PCRE_EOPT, NULL, 0) >= 0)
938 || addr->prop.utf8_downcvt_maybe
939 ) ) )
940 {
941 HDEBUG(D_acl|D_v) debug_printf("utf8 required but not offered\n");
942 errno = ERRNO_UTF8_FWD;
943 setflag(addr, af_verify_nsfail);
944 done = FALSE;
945 }
946 else if ( addr->prop.utf8_msg
947 && (addr->prop.utf8_downcvt || !utf8_offered)
948 && (setflag(addr, af_utf8_downcvt),
949 from_address = string_address_utf8_to_alabel(from_address,
950 &addr->message),
951 addr->message
952 ) )
953 {
954 errno = ERRNO_EXPANDFAIL;
955 setflag(addr, af_verify_nsfail);
956 done = FALSE;
957 }
958 #endif
959
960 /* If we haven't authenticated, but are required to, give up. */
961 /* Try to AUTH */
962
963 else done = smtp_auth(responsebuffer, sizeof(responsebuffer),
964 addr, host, ob, esmtp, &inblock, &outblock) == OK &&
965
966 /* Copy AUTH info for logging */
967 ( (addr->authenticator = client_authenticator),
968 (addr->auth_id = client_authenticated_id),
969
970 /* Build a mail-AUTH string (re-using responsebuffer for convenience */
971 !smtp_mail_auth_str(responsebuffer, sizeof(responsebuffer), addr, ob)
972 ) &&
973
974 ( (addr->auth_sndr = client_authenticated_sender),
975
976 /* Send the MAIL command */
977 (smtp_write_command(&outblock, FALSE,
978 #ifdef EXPERIMENTAL_INTERNATIONAL
979 addr->prop.utf8_msg && !addr->prop.utf8_downcvt
980 ? "MAIL FROM:<%s>%s SMTPUTF8\r\n"
981 :
982 #endif
983 "MAIL FROM:<%s>%s\r\n",
984 from_address, responsebuffer) >= 0)
985 ) &&
986
987 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
988 '2', callout);
989
990 deliver_host = deliver_host_address = NULL;
991 deliver_domain = save_deliver_domain;
992
993 /* If the host does not accept MAIL FROM:<>, arrange to cache this
994 information, but again, don't record anything for an I/O error or a defer. Do
995 not cache rejections of MAIL when a non-empty sender has been used, because
996 that blocks the whole domain for all senders. */
997
998 if (!done)
999 {
1000 *failure_ptr = US"mail"; /* At or before MAIL */
1001 if (errno == 0 && responsebuffer[0] == '5')
1002 {
1003 setflag(addr, af_verify_nsfail);
1004 if (from_address[0] == 0)
1005 new_domain_record.result = ccache_reject_mfnull;
1006 }
1007 }
1008
1009 /* Otherwise, proceed to check a "random" address (if required), then the
1010 given address, and the postmaster address (if required). Between each check,
1011 issue RSET, because some servers accept only one recipient after MAIL
1012 FROM:<>.
1013
1014 Before doing this, set the result in the domain cache record to "accept",
1015 unless its previous value was ccache_reject_mfnull. In that case, the domain
1016 rejects MAIL FROM:<> and we want to continue to remember that. When that is
1017 the case, we have got here only in the case of a recipient verification with
1018 a non-null sender. */
1019
1020 else
1021 {
1022 const uschar * rcpt_domain = addr->domain;
1023
1024 #ifdef EXPERIMENTAL_INTERNATIONAL
1025 uschar * errstr = NULL;
1026 if ( testflag(addr, af_utf8_downcvt)
1027 && (rcpt_domain = string_domain_utf8_to_alabel(rcpt_domain,
1028 &errstr), errstr)
1029 )
1030 {
1031 addr->message = errstr;
1032 errno = ERRNO_EXPANDFAIL;
1033 setflag(addr, af_verify_nsfail);
1034 done = FALSE;
1035 rcpt_domain = US""; /*XXX errorhandling! */
1036 }
1037 #endif
1038
1039 new_domain_record.result =
1040 (old_domain_cache_result == ccache_reject_mfnull)?
1041 ccache_reject_mfnull: ccache_accept;
1042
1043 /* Do the random local part check first */
1044
1045 if (random_local_part != NULL)
1046 {
1047 uschar randombuffer[1024];
1048 BOOL random_ok =
1049 smtp_write_command(&outblock, FALSE,
1050 "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part,
1051 rcpt_domain) >= 0 &&
1052 smtp_read_response(&inblock, randombuffer,
1053 sizeof(randombuffer), '2', callout);
1054
1055 /* Remember when we last did a random test */
1056
1057 new_domain_record.random_stamp = time(NULL);
1058
1059 /* If accepted, we aren't going to do any further tests below. */
1060
1061 if (random_ok)
1062 new_domain_record.random_result = ccache_accept;
1063
1064 /* Otherwise, cache a real negative response, and get back to the right
1065 state to send RCPT. Unless there's some problem such as a dropped
1066 connection, we expect to succeed, because the commands succeeded above.
1067 However, some servers drop the connection after responding to an
1068 invalid recipient, so on (any) error we drop and remake the connection.
1069 */
1070
1071 else if (errno == 0)
1072 {
1073 /* This would be ok for 1st rcpt a cutthrough, but no way to
1074 handle a subsequent. So refuse to support any */
1075 cancel_cutthrough_connection("random-recipient");
1076
1077 if (randombuffer[0] == '5')
1078 new_domain_record.random_result = ccache_reject;
1079
1080 done =
1081 smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
1082 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
1083 '2', callout) &&
1084
1085 smtp_write_command(&outblock, FALSE,
1086 #ifdef EXPERIMENTAL_INTERNATIONAL
1087 addr->prop.utf8_msg && !addr->prop.utf8_downcvt
1088 ? "MAIL FROM:<%s> SMTPUTF8\r\n"
1089 :
1090 #endif
1091 "MAIL FROM:<%s>\r\n",
1092 from_address) >= 0 &&
1093 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
1094 '2', callout);
1095
1096 if (!done)
1097 {
1098 HDEBUG(D_acl|D_v)
1099 debug_printf("problem after random/rset/mfrom; reopen conn\n");
1100 random_local_part = NULL;
1101 #ifdef SUPPORT_TLS
1102 tls_close(FALSE, TRUE);
1103 #endif
1104 (void)close(inblock.sock);
1105 #ifdef EXPERIMENTAL_EVENT
1106 (void) event_raise(addr->transport->event_action,
1107 US"tcp:close", NULL);
1108 #endif
1109 goto tls_retry_connection;
1110 }
1111 }
1112 else done = FALSE; /* Some timeout/connection problem */
1113 } /* Random check */
1114
1115 /* If the host is accepting all local parts, as determined by the "random"
1116 check, we don't need to waste time doing any further checking. */
1117
1118 if (new_domain_record.random_result != ccache_accept && done)
1119 {
1120 /* Get the rcpt_include_affixes flag from the transport if there is one,
1121 but assume FALSE if there is not. */
1122
1123 uschar * rcpt = transport_rcpt_address(addr,
1124 addr->transport ? addr->transport->rcpt_include_affixes : FALSE);
1125
1126 #ifdef EXPERIMENTAL_INTERNATIONAL
1127 /*XXX should the conversion be moved into transport_rcpt_address() ? */
1128 uschar * dummy_errstr = NULL;
1129 if ( testflag(addr, af_utf8_downcvt)
1130 && (rcpt = string_address_utf8_to_alabel(rcpt, &dummy_errstr),
1131 dummy_errstr
1132 ) )
1133 {
1134 errno = ERRNO_EXPANDFAIL;
1135 *failure_ptr = US"recipient";
1136 done = FALSE;
1137 }
1138 else
1139 #endif
1140
1141 done =
1142 smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
1143 rcpt) >= 0 &&
1144 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
1145 '2', callout);
1146
1147 if (done)
1148 new_address_record.result = ccache_accept;
1149 else if (errno == 0 && responsebuffer[0] == '5')
1150 {
1151 *failure_ptr = US"recipient";
1152 new_address_record.result = ccache_reject;
1153 }
1154
1155 /* Do postmaster check if requested; if a full check is required, we
1156 check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
1157
1158 if (done && pm_mailfrom != NULL)
1159 {
1160 /* Could possibly shift before main verify, just above, and be ok
1161 for cutthrough. But no way to handle a subsequent rcpt, so just
1162 refuse any */
1163 cancel_cutthrough_connection("postmaster verify");
1164 HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of postmaster verify\n");
1165
1166 done =
1167 smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
1168 smtp_read_response(&inblock, responsebuffer,
1169 sizeof(responsebuffer), '2', callout) &&
1170
1171 smtp_write_command(&outblock, FALSE,
1172 "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 &&
1173 smtp_read_response(&inblock, responsebuffer,
1174 sizeof(responsebuffer), '2', callout) &&
1175
1176 /* First try using the current domain */
1177
1178 ((
1179 smtp_write_command(&outblock, FALSE,
1180 "RCPT TO:<postmaster@%.1000s>\r\n", rcpt_domain) >= 0 &&
1181 smtp_read_response(&inblock, responsebuffer,
1182 sizeof(responsebuffer), '2', callout)
1183 )
1184
1185 ||
1186
1187 /* If that doesn't work, and a full check is requested,
1188 try without the domain. */
1189
1190 (
1191 (options & vopt_callout_fullpm) != 0 &&
1192 smtp_write_command(&outblock, FALSE,
1193 "RCPT TO:<postmaster>\r\n") >= 0 &&
1194 smtp_read_response(&inblock, responsebuffer,
1195 sizeof(responsebuffer), '2', callout)
1196 ));
1197
1198 /* Sort out the cache record */
1199
1200 new_domain_record.postmaster_stamp = time(NULL);
1201
1202 if (done)
1203 new_domain_record.postmaster_result = ccache_accept;
1204 else if (errno == 0 && responsebuffer[0] == '5')
1205 {
1206 *failure_ptr = US"postmaster";
1207 setflag(addr, af_verify_pmfail);
1208 new_domain_record.postmaster_result = ccache_reject;
1209 }
1210 }
1211 } /* Random not accepted */
1212 } /* MAIL FROM: accepted */
1213
1214 /* For any failure of the main check, other than a negative response, we just
1215 close the connection and carry on. We can identify a negative response by the
1216 fact that errno is zero. For I/O errors it will be non-zero
1217
1218 Set up different error texts for logging and for sending back to the caller
1219 as an SMTP response. Log in all cases, using a one-line format. For sender
1220 callouts, give a full response to the caller, but for recipient callouts,
1221 don't give the IP address because this may be an internal host whose identity
1222 is not to be widely broadcast. */
1223
1224 if (!done)
1225 {
1226 if (errno == ETIMEDOUT)
1227 {
1228 HDEBUG(D_verify) debug_printf("SMTP timeout\n");
1229 send_quit = FALSE;
1230 }
1231 #ifdef EXPERIMENTAL_INTERNATIONAL
1232 else if (errno == ERRNO_UTF8_FWD)
1233 {
1234 extern int acl_where; /* src/acl.c */
1235 errno = 0;
1236 addr->message = string_sprintf(
1237 "response to \"%s\" from %s [%s] did not include SMTPUTF8",
1238 big_buffer, host->name, host->address);
1239 addr->user_message = acl_where == ACL_WHERE_RCPT
1240 ? US"533 mailbox name not allowed"
1241 : US"550 mailbox unavailable";
1242 yield = FAIL;
1243 done = TRUE;
1244 }
1245 #endif
1246 else if (errno == 0)
1247 {
1248 if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped");
1249
1250 addr->message =
1251 string_sprintf("response to \"%s\" from %s [%s] was: %s",
1252 big_buffer, host->name, host->address,
1253 string_printing(responsebuffer));
1254
1255 addr->user_message = is_recipient?
1256 string_sprintf("Callout verification failed:\n%s", responsebuffer)
1257 :
1258 string_sprintf("Called: %s\nSent: %s\nResponse: %s",
1259 host->address, big_buffer, responsebuffer);
1260
1261 /* Hard rejection ends the process */
1262
1263 if (responsebuffer[0] == '5') /* Address rejected */
1264 {
1265 yield = FAIL;
1266 done = TRUE;
1267 }
1268 }
1269 }
1270
1271 /* End the SMTP conversation and close the connection. */
1272
1273 /* Cutthrough - on a successfull connect and recipient-verify with
1274 use-sender and we are 1st rcpt and have no cutthrough conn so far
1275 here is where we want to leave the conn open */
1276 if ( cutthrough.delivery
1277 && rcpt_count == 1
1278 && done
1279 && yield == OK
1280 && (options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == vopt_callout_recipsender
1281 && !random_local_part
1282 && !pm_mailfrom
1283 && cutthrough.fd < 0
1284 && !lmtp
1285 )
1286 {
1287 cutthrough.fd = outblock.sock; /* We assume no buffer in use in the outblock */
1288 cutthrough.nrcpt = 1;
1289 cutthrough.interface = interface;
1290 cutthrough.host = *host;
1291 cutthrough.addr = *addr; /* Save the address_item for later logging */
1292 cutthrough.addr.next = NULL;
1293 cutthrough.addr.host_used = &cutthrough.host;
1294 if (addr->parent)
1295 *(cutthrough.addr.parent = store_get(sizeof(address_item))) =
1296 *addr->parent;
1297 ctblock.buffer = ctbuffer;
1298 ctblock.buffersize = sizeof(ctbuffer);
1299 ctblock.ptr = ctbuffer;
1300 /* ctblock.cmd_count = 0; ctblock.authenticating = FALSE; */
1301 ctblock.sock = cutthrough.fd;
1302 }
1303 else
1304 {
1305 /* Ensure no cutthrough on multiple address verifies */
1306 if (options & vopt_callout_recipsender)
1307 cancel_cutthrough_connection("multiple verify calls");
1308 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
1309
1310 #ifdef SUPPORT_TLS
1311 tls_close(FALSE, TRUE);
1312 #endif
1313 (void)close(inblock.sock);
1314 #ifdef EXPERIMENTAL_EVENT
1315 (void) event_raise(addr->transport->event_action,
1316 US"tcp:close", NULL);
1317 #endif
1318 }
1319
1320 } /* Loop through all hosts, while !done */
1321 }
1322
1323 /* If we get here with done == TRUE, a successful callout happened, and yield
1324 will be set OK or FAIL according to the response to the RCPT command.
1325 Otherwise, we looped through the hosts but couldn't complete the business.
1326 However, there may be domain-specific information to cache in both cases.
1327
1328 The value of the result field in the new_domain record is ccache_unknown if
1329 there was an error before or with MAIL FROM:, and errno was not zero,
1330 implying some kind of I/O error. We don't want to write the cache in that case.
1331 Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
1332
1333 if (!callout_no_cache && new_domain_record.result != ccache_unknown)
1334 {
1335 if ((dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE))
1336 == NULL)
1337 {
1338 HDEBUG(D_verify) debug_printf("callout cache: not available\n");
1339 }
1340 else
1341 {
1342 (void)dbfn_write(dbm_file, addr->domain, &new_domain_record,
1343 (int)sizeof(dbdata_callout_cache));
1344 HDEBUG(D_verify) debug_printf("wrote callout cache domain record:\n"
1345 " result=%d postmaster=%d random=%d\n",
1346 new_domain_record.result,
1347 new_domain_record.postmaster_result,
1348 new_domain_record.random_result);
1349 }
1350 }
1351
1352 /* If a definite result was obtained for the callout, cache it unless caching
1353 is disabled. */
1354
1355 if (done)
1356 {
1357 if (!callout_no_cache && new_address_record.result != ccache_unknown)
1358 {
1359 if (dbm_file == NULL)
1360 dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE);
1361 if (dbm_file == NULL)
1362 {
1363 HDEBUG(D_verify) debug_printf("no callout cache available\n");
1364 }
1365 else
1366 {
1367 (void)dbfn_write(dbm_file, address_key, &new_address_record,
1368 (int)sizeof(dbdata_callout_cache_address));
1369 HDEBUG(D_verify) debug_printf("wrote %s callout cache address record\n",
1370 (new_address_record.result == ccache_accept)? "positive" : "negative");
1371 }
1372 }
1373 } /* done */
1374
1375 /* Failure to connect to any host, or any response other than 2xx or 5xx is a
1376 temporary error. If there was only one host, and a response was received, leave
1377 it alone if supplying details. Otherwise, give a generic response. */
1378
1379 else /* !done */
1380 {
1381 uschar *dullmsg = string_sprintf("Could not complete %s verify callout",
1382 is_recipient? "recipient" : "sender");
1383 yield = DEFER;
1384
1385 if (host_list->next != NULL || addr->message == NULL) addr->message = dullmsg;
1386
1387 addr->user_message = (!smtp_return_error_details)? dullmsg :
1388 string_sprintf("%s for <%s>.\n"
1389 "The mail server(s) for the domain may be temporarily unreachable, or\n"
1390 "they may be permanently unreachable from this server. In the latter case,\n%s",
1391 dullmsg, addr->address,
1392 is_recipient?
1393 "the address will never be accepted."
1394 :
1395 "you need to change the address or create an MX record for its domain\n"
1396 "if it is supposed to be generally accessible from the Internet.\n"
1397 "Talk to your mail administrator for details.");
1398
1399 /* Force a specific error code */
1400
1401 addr->basic_errno = ERRNO_CALLOUTDEFER;
1402 }
1403
1404 /* Come here from within the cache-reading code on fast-track exit. */
1405
1406 END_CALLOUT:
1407 if (dbm_file != NULL) dbfn_close(dbm_file);
1408 return yield;
1409 }
1410
1411
1412
1413 /* Called after recipient-acl to get a cutthrough connection open when
1414 one was requested and a recipient-verify wasn't subsequently done.
1415 */
1416 void
1417 open_cutthrough_connection( address_item * addr )
1418 {
1419 address_item addr2;
1420
1421 /* Use a recipient-verify-callout to set up the cutthrough connection. */
1422 /* We must use a copy of the address for verification, because it might
1423 get rewritten. */
1424
1425 addr2 = *addr;
1426 HDEBUG(D_acl) debug_printf("----------- %s cutthrough setup ------------\n",
1427 rcpt_count > 1 ? "more" : "start");
1428 (void) verify_address(&addr2, NULL,
1429 vopt_is_recipient | vopt_callout_recipsender | vopt_callout_no_cache,
1430 CUTTHROUGH_CMD_TIMEOUT, -1, -1,
1431 NULL, NULL, NULL);
1432 HDEBUG(D_acl) debug_printf("----------- end cutthrough setup ------------\n");
1433 return;
1434 }
1435
1436
1437
1438 /* Send given number of bytes from the buffer */
1439 static BOOL
1440 cutthrough_send(int n)
1441 {
1442 if(cutthrough.fd < 0)
1443 return TRUE;
1444
1445 if(
1446 #ifdef SUPPORT_TLS
1447 (tls_out.active == cutthrough.fd) ? tls_write(FALSE, ctblock.buffer, n) :
1448 #endif
1449 send(cutthrough.fd, ctblock.buffer, n, 0) > 0
1450 )
1451 {
1452 transport_count += n;
1453 ctblock.ptr= ctblock.buffer;
1454 return TRUE;
1455 }
1456
1457 HDEBUG(D_transport|D_acl) debug_printf("cutthrough_send failed: %s\n", strerror(errno));
1458 return FALSE;
1459 }
1460
1461
1462
1463 static BOOL
1464 _cutthrough_puts(uschar * cp, int n)
1465 {
1466 while(n--)
1467 {
1468 if(ctblock.ptr >= ctblock.buffer+ctblock.buffersize)
1469 if(!cutthrough_send(ctblock.buffersize))
1470 return FALSE;
1471
1472 *ctblock.ptr++ = *cp++;
1473 }
1474 return TRUE;
1475 }
1476
1477 /* Buffered output of counted data block. Return boolean success */
1478 BOOL
1479 cutthrough_puts(uschar * cp, int n)
1480 {
1481 if (cutthrough.fd < 0) return TRUE;
1482 if (_cutthrough_puts(cp, n)) return TRUE;
1483 cancel_cutthrough_connection("transmit failed");
1484 return FALSE;
1485 }
1486
1487
1488 static BOOL
1489 _cutthrough_flush_send(void)
1490 {
1491 int n= ctblock.ptr-ctblock.buffer;
1492
1493 if(n>0)
1494 if(!cutthrough_send(n))
1495 return FALSE;
1496 return TRUE;
1497 }
1498
1499
1500 /* Send out any bufferred output. Return boolean success. */
1501 BOOL
1502 cutthrough_flush_send(void)
1503 {
1504 if (_cutthrough_flush_send()) return TRUE;
1505 cancel_cutthrough_connection("transmit failed");
1506 return FALSE;
1507 }
1508
1509
1510 BOOL
1511 cutthrough_put_nl(void)
1512 {
1513 return cutthrough_puts(US"\r\n", 2);
1514 }
1515
1516
1517 /* Get and check response from cutthrough target */
1518 static uschar
1519 cutthrough_response(char expect, uschar ** copy)
1520 {
1521 smtp_inblock inblock;
1522 uschar inbuffer[4096];
1523 uschar responsebuffer[4096];
1524
1525 inblock.buffer = inbuffer;
1526 inblock.buffersize = sizeof(inbuffer);
1527 inblock.ptr = inbuffer;
1528 inblock.ptrend = inbuffer;
1529 inblock.sock = cutthrough.fd;
1530 /* this relies on (inblock.sock == tls_out.active) */
1531 if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, CUTTHROUGH_DATA_TIMEOUT))
1532 cancel_cutthrough_connection("target timeout on read");
1533
1534 if(copy != NULL)
1535 {
1536 uschar * cp;
1537 *copy = cp = string_copy(responsebuffer);
1538 /* Trim the trailing end of line */
1539 cp += Ustrlen(responsebuffer);
1540 if(cp > *copy && cp[-1] == '\n') *--cp = '\0';
1541 if(cp > *copy && cp[-1] == '\r') *--cp = '\0';
1542 }
1543
1544 return responsebuffer[0];
1545 }
1546
1547
1548 /* Negotiate dataphase with the cutthrough target, returning success boolean */
1549 BOOL
1550 cutthrough_predata(void)
1551 {
1552 if(cutthrough.fd < 0)
1553 return FALSE;
1554
1555 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> DATA\n");
1556 cutthrough_puts(US"DATA\r\n", 6);
1557 cutthrough_flush_send();
1558
1559 /* Assume nothing buffered. If it was it gets ignored. */
1560 return cutthrough_response('3', NULL) == '3';
1561 }
1562
1563
1564 /* fd and use_crlf args only to match write_chunk() */
1565 static BOOL
1566 cutthrough_write_chunk(int fd, uschar * s, int len, BOOL use_crlf)
1567 {
1568 uschar * s2;
1569 while(s && (s2 = Ustrchr(s, '\n')))
1570 {
1571 if(!cutthrough_puts(s, s2-s) || !cutthrough_put_nl())
1572 return FALSE;
1573 s = s2+1;
1574 }
1575 return TRUE;
1576 }
1577
1578
1579 /* Buffered send of headers. Return success boolean. */
1580 /* Expands newlines to wire format (CR,NL). */
1581 /* Also sends header-terminating blank line. */
1582 BOOL
1583 cutthrough_headers_send(void)
1584 {
1585 if(cutthrough.fd < 0)
1586 return FALSE;
1587
1588 /* We share a routine with the mainline transport to handle header add/remove/rewrites,
1589 but having a separate buffered-output function (for now)
1590 */
1591 HDEBUG(D_acl) debug_printf("----------- start cutthrough headers send -----------\n");
1592
1593 if (!transport_headers_send(&cutthrough.addr, cutthrough.fd,
1594 cutthrough.addr.transport->add_headers,
1595 cutthrough.addr.transport->remove_headers,
1596 &cutthrough_write_chunk, TRUE,
1597 cutthrough.addr.transport->rewrite_rules,
1598 cutthrough.addr.transport->rewrite_existflags))
1599 return FALSE;
1600
1601 HDEBUG(D_acl) debug_printf("----------- done cutthrough headers send ------------\n");
1602 return TRUE;
1603 }
1604
1605
1606 static void
1607 close_cutthrough_connection(const char * why)
1608 {
1609 if(cutthrough.fd >= 0)
1610 {
1611 /* We could be sending this after a bunch of data, but that is ok as
1612 the only way to cancel the transfer in dataphase is to drop the tcp
1613 conn before the final dot.
1614 */
1615 ctblock.ptr = ctbuffer;
1616 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> QUIT\n");
1617 _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */
1618 _cutthrough_flush_send();
1619 /* No wait for response */
1620
1621 #ifdef SUPPORT_TLS
1622 tls_close(FALSE, TRUE);
1623 #endif
1624 (void)close(cutthrough.fd);
1625 cutthrough.fd = -1;
1626 HDEBUG(D_acl) debug_printf("----------- cutthrough shutdown (%s) ------------\n", why);
1627 }
1628 ctblock.ptr = ctbuffer;
1629 }
1630
1631 void
1632 cancel_cutthrough_connection(const char * why)
1633 {
1634 close_cutthrough_connection(why);
1635 cutthrough.delivery = FALSE;
1636 }
1637
1638
1639
1640
1641 /* Have senders final-dot. Send one to cutthrough target, and grab the response.
1642 Log an OK response as a transmission.
1643 Close the connection.
1644 Return smtp response-class digit.
1645 */
1646 uschar *
1647 cutthrough_finaldot(void)
1648 {
1649 uschar res;
1650 address_item * addr;
1651 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> .\n");
1652
1653 /* Assume data finshed with new-line */
1654 if( !cutthrough_puts(US".", 1)
1655 || !cutthrough_put_nl()
1656 || !cutthrough_flush_send()
1657 )
1658 return cutthrough.addr.message;
1659
1660 res = cutthrough_response('2', &cutthrough.addr.message);
1661 for (addr = &cutthrough.addr; addr; addr = addr->next)
1662 {
1663 addr->message = cutthrough.addr.message;
1664 switch(res)
1665 {
1666 case '2':
1667 delivery_log(LOG_MAIN, addr, (int)'>', NULL);
1668 close_cutthrough_connection("delivered");
1669 break;
1670
1671 case '4':
1672 delivery_log(LOG_MAIN, addr, 0,
1673 US"tmp-reject from cutthrough after DATA:");
1674 break;
1675
1676 case '5':
1677 delivery_log(LOG_MAIN|LOG_REJECT, addr, 0,
1678 US"rejected after DATA:");
1679 break;
1680
1681 default:
1682 break;
1683 }
1684 }
1685 return cutthrough.addr.message;
1686 }
1687
1688
1689
1690 /*************************************************
1691 * Copy error to toplevel address *
1692 *************************************************/
1693
1694 /* This function is used when a verify fails or defers, to ensure that the
1695 failure or defer information is in the original toplevel address. This applies
1696 when an address is redirected to a single new address, and the failure or
1697 deferral happens to the child address.
1698
1699 Arguments:
1700 vaddr the verify address item
1701 addr the final address item
1702 yield FAIL or DEFER
1703
1704 Returns: the value of YIELD
1705 */
1706
1707 static int
1708 copy_error(address_item *vaddr, address_item *addr, int yield)
1709 {
1710 if (addr != vaddr)
1711 {
1712 vaddr->message = addr->message;
1713 vaddr->user_message = addr->user_message;
1714 vaddr->basic_errno = addr->basic_errno;
1715 vaddr->more_errno = addr->more_errno;
1716 vaddr->prop.address_data = addr->prop.address_data;
1717 copyflag(vaddr, addr, af_pass_message);
1718 }
1719 return yield;
1720 }
1721
1722
1723
1724
1725 /**************************************************
1726 * printf that automatically handles TLS if needed *
1727 ***************************************************/
1728
1729 /* This function is used by verify_address() as a substitute for all fprintf()
1730 calls; a direct fprintf() will not produce output in a TLS SMTP session, such
1731 as a response to an EXPN command. smtp_in.c makes smtp_printf available but
1732 that assumes that we always use the smtp_out FILE* when not using TLS or the
1733 ssl buffer when we are. Instead we take a FILE* parameter and check to see if
1734 that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular
1735 fprintf().
1736
1737 Arguments:
1738 f the candidate FILE* to write to
1739 format format string
1740 ... optional arguments
1741
1742 Returns:
1743 nothing
1744 */
1745
1746 static void PRINTF_FUNCTION(2,3)
1747 respond_printf(FILE *f, const char *format, ...)
1748 {
1749 va_list ap;
1750
1751 va_start(ap, format);
1752 if (smtp_out && (f == smtp_out))
1753 smtp_vprintf(format, ap);
1754 else
1755 vfprintf(f, format, ap);
1756 va_end(ap);
1757 }
1758
1759
1760
1761 /*************************************************
1762 * Verify an email address *
1763 *************************************************/
1764
1765 /* This function is used both for verification (-bv and at other times) and
1766 address testing (-bt), which is indicated by address_test_mode being set.
1767
1768 Arguments:
1769 vaddr contains the address to verify; the next field in this block
1770 must be NULL
1771 f if not NULL, write the result to this file
1772 options various option bits:
1773 vopt_fake_sender => this sender verify is not for the real
1774 sender (it was verify=sender=xxxx or an address from a
1775 header line) - rewriting must not change sender_address
1776 vopt_is_recipient => this is a recipient address, otherwise
1777 it's a sender address - this affects qualification and
1778 rewriting and messages from callouts
1779 vopt_qualify => qualify an unqualified address; else error
1780 vopt_expn => called from SMTP EXPN command
1781 vopt_success_on_redirect => when a new address is generated
1782 the verification instantly succeeds
1783
1784 These ones are used by do_callout() -- the options variable
1785 is passed to it.
1786
1787 vopt_callout_fullpm => if postmaster check, do full one
1788 vopt_callout_no_cache => don't use callout cache
1789 vopt_callout_random => do the "random" thing
1790 vopt_callout_recipsender => use real sender for recipient
1791 vopt_callout_recippmaster => use postmaster for recipient
1792
1793 callout if > 0, specifies that callout is required, and gives timeout
1794 for individual commands
1795 callout_overall if > 0, gives overall timeout for the callout function;
1796 if < 0, a default is used (see do_callout())
1797 callout_connect the connection timeout for callouts
1798 se_mailfrom when callout is requested to verify a sender, use this
1799 in MAIL FROM; NULL => ""
1800 pm_mailfrom when callout is requested, if non-NULL, do the postmaster
1801 thing and use this as the sender address (may be "")
1802
1803 routed if not NULL, set TRUE if routing succeeded, so we can
1804 distinguish between routing failed and callout failed
1805
1806 Returns: OK address verified
1807 FAIL address failed to verify
1808 DEFER can't tell at present
1809 */
1810
1811 int
1812 verify_address(address_item *vaddr, FILE *f, int options, int callout,
1813 int callout_overall, int callout_connect, uschar *se_mailfrom,
1814 uschar *pm_mailfrom, BOOL *routed)
1815 {
1816 BOOL allok = TRUE;
1817 BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0);
1818 BOOL is_recipient = (options & vopt_is_recipient) != 0;
1819 BOOL expn = (options & vopt_expn) != 0;
1820 BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0;
1821 int i;
1822 int yield = OK;
1823 int verify_type = expn? v_expn :
1824 address_test_mode? v_none :
1825 is_recipient? v_recipient : v_sender;
1826 address_item *addr_list;
1827 address_item *addr_new = NULL;
1828 address_item *addr_remote = NULL;
1829 address_item *addr_local = NULL;
1830 address_item *addr_succeed = NULL;
1831 uschar **failure_ptr = is_recipient?
1832 &recipient_verify_failure : &sender_verify_failure;
1833 uschar *ko_prefix, *cr;
1834 uschar *address = vaddr->address;
1835 uschar *save_sender;
1836 uschar null_sender[] = { 0 }; /* Ensure writeable memory */
1837
1838 /* Clear, just in case */
1839
1840 *failure_ptr = NULL;
1841
1842 /* Set up a prefix and suffix for error message which allow us to use the same
1843 output statements both in EXPN mode (where an SMTP response is needed) and when
1844 debugging with an output file. */
1845
1846 if (expn)
1847 {
1848 ko_prefix = US"553 ";
1849 cr = US"\r";
1850 }
1851 else ko_prefix = cr = US"";
1852
1853 /* Add qualify domain if permitted; otherwise an unqualified address fails. */
1854
1855 if (parse_find_at(address) == NULL)
1856 {
1857 if ((options & vopt_qualify) == 0)
1858 {
1859 if (f != NULL)
1860 respond_printf(f, "%sA domain is required for \"%s\"%s\n",
1861 ko_prefix, address, cr);
1862 *failure_ptr = US"qualify";
1863 return FAIL;
1864 }
1865 address = rewrite_address_qualify(address, is_recipient);
1866 }
1867
1868 DEBUG(D_verify)
1869 {
1870 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1871 debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address);
1872 }
1873
1874 /* Rewrite and report on it. Clear the domain and local part caches - these
1875 may have been set by domains and local part tests during an ACL. */
1876
1877 if (global_rewrite_rules != NULL)
1878 {
1879 uschar *old = address;
1880 address = rewrite_address(address, is_recipient, FALSE,
1881 global_rewrite_rules, rewrite_existflags);
1882 if (address != old)
1883 {
1884 for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0;
1885 for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0;
1886 if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address);
1887 }
1888 }
1889
1890 /* If this is the real sender address, we must update sender_address at
1891 this point, because it may be referred to in the routers. */
1892
1893 if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0)
1894 sender_address = address;
1895
1896 /* If the address was rewritten to <> no verification can be done, and we have
1897 to return OK. This rewriting is permitted only for sender addresses; for other
1898 addresses, such rewriting fails. */
1899
1900 if (address[0] == 0) return OK;
1901
1902 /* Flip the legacy TLS-related variables over to the outbound set in case
1903 they're used in the context of a transport used by verification. Reset them
1904 at exit from this routine. */
1905
1906 tls_modify_variables(&tls_out);
1907
1908 /* Save a copy of the sender address for re-instating if we change it to <>
1909 while verifying a sender address (a nice bit of self-reference there). */
1910
1911 save_sender = sender_address;
1912
1913 /* Update the address structure with the possibly qualified and rewritten
1914 address. Set it up as the starting address on the chain of new addresses. */
1915
1916 vaddr->address = address;
1917 addr_new = vaddr;
1918
1919 /* We need a loop, because an address can generate new addresses. We must also
1920 cope with generated pipes and files at the top level. (See also the code and
1921 comment in deliver.c.) However, it is usually the case that the router for
1922 user's .forward files has its verify flag turned off.
1923
1924 If an address generates more than one child, the loop is used only when
1925 full_info is set, and this can only be set locally. Remote enquiries just get
1926 information about the top level address, not anything that it generated. */
1927
1928 while (addr_new != NULL)
1929 {
1930 int rc;
1931 address_item *addr = addr_new;
1932
1933 addr_new = addr->next;
1934 addr->next = NULL;
1935
1936 DEBUG(D_verify)
1937 {
1938 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1939 debug_printf("Considering %s\n", addr->address);
1940 }
1941
1942 /* Handle generated pipe, file or reply addresses. We don't get these
1943 when handling EXPN, as it does only one level of expansion. */
1944
1945 if (testflag(addr, af_pfr))
1946 {
1947 allok = FALSE;
1948 if (f != NULL)
1949 {
1950 BOOL allow;
1951
1952 if (addr->address[0] == '>')
1953 {
1954 allow = testflag(addr, af_allow_reply);
1955 fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1);
1956 }
1957 else
1958 {
1959 allow = (addr->address[0] == '|')?
1960 testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file);
1961 fprintf(f, "%s -> %s", addr->parent->address, addr->address);
1962 }
1963
1964 if (addr->basic_errno == ERRNO_BADTRANSPORT)
1965 fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n"
1966 "%s\n", addr->message);
1967 else if (allow)
1968 fprintf(f, "\n transport = %s\n", addr->transport->name);
1969 else
1970 fprintf(f, " *** forbidden ***\n");
1971 }
1972 continue;
1973 }
1974
1975 /* Just in case some router parameter refers to it. */
1976
1977 return_path = (addr->prop.errors_address != NULL)?
1978 addr->prop.errors_address : sender_address;
1979
1980 /* Split the address into domain and local part, handling the %-hack if
1981 necessary, and then route it. While routing a sender address, set
1982 $sender_address to <> because that is what it will be if we were trying to
1983 send a bounce to the sender. */
1984
1985 if (routed != NULL) *routed = FALSE;
1986 if ((rc = deliver_split_address(addr)) == OK)
1987 {
1988 if (!is_recipient) sender_address = null_sender;
1989 rc = route_address(addr, &addr_local, &addr_remote, &addr_new,
1990 &addr_succeed, verify_type);
1991 sender_address = save_sender; /* Put back the real sender */
1992 }
1993
1994 /* If routing an address succeeded, set the flag that remembers, for use when
1995 an ACL cached a sender verify (in case a callout fails). Then if routing set
1996 up a list of hosts or the transport has a host list, and the callout option
1997 is set, and we aren't in a host checking run, do the callout verification,
1998 and set another flag that notes that a callout happened. */
1999
2000 if (rc == OK)
2001 {
2002 if (routed != NULL) *routed = TRUE;
2003 if (callout > 0)
2004 {
2005 host_item *host_list = addr->host_list;
2006
2007 /* Make up some data for use in the case where there is no remote
2008 transport. */
2009
2010 transport_feedback tf = {
2011 NULL, /* interface (=> any) */
2012 US"smtp", /* port */
2013 US"smtp", /* protocol */
2014 NULL, /* hosts */
2015 US"$smtp_active_hostname", /* helo_data */
2016 FALSE, /* hosts_override */
2017 FALSE, /* hosts_randomize */
2018 FALSE, /* gethostbyname */
2019 TRUE, /* qualify_single */
2020 FALSE /* search_parents */
2021 };
2022
2023 /* If verification yielded a remote transport, we want to use that
2024 transport's options, so as to mimic what would happen if we were really
2025 sending a message to this address. */
2026
2027 if (addr->transport != NULL && !addr->transport->info->local)
2028 {
2029 (void)(addr->transport->setup)(addr->transport, addr, &tf, 0, 0, NULL);
2030
2031 /* If the transport has hosts and the router does not, or if the
2032 transport is configured to override the router's hosts, we must build a
2033 host list of the transport's hosts, and find the IP addresses */
2034
2035 if (tf.hosts != NULL && (host_list == NULL || tf.hosts_override))
2036 {
2037 uschar *s;
2038 const uschar *save_deliver_domain = deliver_domain;
2039 uschar *save_deliver_localpart = deliver_localpart;
2040
2041 host_list = NULL; /* Ignore the router's hosts */
2042
2043 deliver_domain = addr->domain;
2044 deliver_localpart = addr->local_part;
2045 s = expand_string(tf.hosts);
2046 deliver_domain = save_deliver_domain;
2047 deliver_localpart = save_deliver_localpart;
2048
2049 if (s == NULL)
2050 {
2051 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts "
2052 "\"%s\" in %s transport for callout: %s", tf.hosts,
2053 addr->transport->name, expand_string_message);
2054 }
2055 else
2056 {
2057 int flags;
2058 host_item *host, *nexthost;
2059 host_build_hostlist(&host_list, s, tf.hosts_randomize);
2060
2061 /* Just ignore failures to find a host address. If we don't manage
2062 to find any addresses, the callout will defer. Note that more than
2063 one address may be found for a single host, which will result in
2064 additional host items being inserted into the chain. Hence we must
2065 save the next host first. */
2066
2067 flags = HOST_FIND_BY_A;
2068 if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2069 if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2070
2071 for (host = host_list; host != NULL; host = nexthost)
2072 {
2073 nexthost = host->next;
2074 if (tf.gethostbyname ||
2075 string_is_ip_address(host->name, NULL) != 0)
2076 (void)host_find_byname(host, NULL, flags, NULL, TRUE);
2077 else
2078 {
2079 dnssec_domains * dnssec_domains = NULL;
2080 if (Ustrcmp(addr->transport->driver_name, "smtp") == 0)
2081 {
2082 smtp_transport_options_block * ob =
2083 (smtp_transport_options_block *)
2084 addr->transport->options_block;
2085 dnssec_domains = &ob->dnssec;
2086 }
2087
2088 (void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2089 dnssec_domains, NULL, NULL);
2090 }
2091 }
2092 }
2093 }
2094 }
2095
2096 /* Can only do a callout if we have at least one host! If the callout
2097 fails, it will have set ${sender,recipient}_verify_failure. */
2098
2099 if (host_list != NULL)
2100 {
2101 HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n");
2102 if (host_checking && !host_checking_callout)
2103 {
2104 HDEBUG(D_verify)
2105 debug_printf("... callout omitted by default when host testing\n"
2106 "(Use -bhc if you want the callouts to happen.)\n");
2107 }
2108 else
2109 {
2110 #ifdef SUPPORT_TLS
2111 deliver_set_expansions(addr);
2112 #endif
2113 verify_mode = is_recipient ? US"R" : US"S";
2114 rc = do_callout(addr, host_list, &tf, callout, callout_overall,
2115 callout_connect, options, se_mailfrom, pm_mailfrom);
2116 verify_mode = NULL;
2117 }
2118 }
2119 else
2120 {
2121 HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor "
2122 "transport provided a host list\n");
2123 }
2124 }
2125 }
2126
2127 /* Otherwise, any failure is a routing failure */
2128
2129 else *failure_ptr = US"route";
2130
2131 /* A router may return REROUTED if it has set up a child address as a result
2132 of a change of domain name (typically from widening). In this case we always
2133 want to continue to verify the new child. */
2134
2135 if (rc == REROUTED) continue;
2136
2137 /* Handle hard failures */
2138
2139 if (rc == FAIL)
2140 {
2141 allok = FALSE;
2142 if (f != NULL)
2143 {
2144 address_item *p = addr->parent;
2145
2146 respond_printf(f, "%s%s %s", ko_prefix,
2147 full_info? addr->address : address,
2148 address_test_mode? "is undeliverable" : "failed to verify");
2149 if (!expn && admin_user)
2150 {
2151 if (addr->basic_errno > 0)
2152 respond_printf(f, ": %s", strerror(addr->basic_errno));
2153 if (addr->message != NULL)
2154 respond_printf(f, ": %s", addr->message);
2155 }
2156
2157 /* Show parents iff doing full info */
2158
2159 if (full_info) while (p != NULL)
2160 {
2161 respond_printf(f, "%s\n <-- %s", cr, p->address);
2162 p = p->parent;
2163 }
2164 respond_printf(f, "%s\n", cr);
2165 }
2166 cancel_cutthrough_connection("routing hard fail");
2167
2168 if (!full_info)
2169 {
2170 yield = copy_error(vaddr, addr, FAIL);
2171 goto out;
2172 }
2173 else yield = FAIL;
2174 }
2175
2176 /* Soft failure */
2177
2178 else if (rc == DEFER)
2179 {
2180 allok = FALSE;
2181 if (f != NULL)
2182 {
2183 address_item *p = addr->parent;
2184 respond_printf(f, "%s%s cannot be resolved at this time", ko_prefix,
2185 full_info? addr->address : address);
2186 if (!expn && admin_user)
2187 {
2188 if (addr->basic_errno > 0)
2189 respond_printf(f, ": %s", strerror(addr->basic_errno));
2190 if (addr->message != NULL)
2191 respond_printf(f, ": %s", addr->message);
2192 else if (addr->basic_errno <= 0)
2193 respond_printf(f, ": unknown error");
2194 }
2195
2196 /* Show parents iff doing full info */
2197
2198 if (full_info) while (p != NULL)
2199 {
2200 respond_printf(f, "%s\n <-- %s", cr, p->address);
2201 p = p->parent;
2202 }
2203 respond_printf(f, "%s\n", cr);
2204 }
2205 cancel_cutthrough_connection("routing soft fail");
2206
2207 if (!full_info)
2208 {
2209 yield = copy_error(vaddr, addr, DEFER);
2210 goto out;
2211 }
2212 else if (yield == OK) yield = DEFER;
2213 }
2214
2215 /* If we are handling EXPN, we do not want to continue to route beyond
2216 the top level (whose address is in "address"). */
2217
2218 else if (expn)
2219 {
2220 uschar *ok_prefix = US"250-";
2221 if (addr_new == NULL)
2222 {
2223 if (addr_local == NULL && addr_remote == NULL)
2224 respond_printf(f, "250 mail to <%s> is discarded\r\n", address);
2225 else
2226 respond_printf(f, "250 <%s>\r\n", address);
2227 }
2228 else while (addr_new != NULL)
2229 {
2230 address_item *addr2 = addr_new;
2231 addr_new = addr2->next;
2232 if (addr_new == NULL) ok_prefix = US"250 ";
2233 respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address);
2234 }
2235 yield = OK;
2236 goto out;
2237 }
2238
2239 /* Successful routing other than EXPN. */
2240
2241 else
2242 {
2243 /* Handle successful routing when short info wanted. Otherwise continue for
2244 other (generated) addresses. Short info is the operational case. Full info
2245 can be requested only when debug_selector != 0 and a file is supplied.
2246
2247 There is a conflict between the use of aliasing as an alternate email
2248 address, and as a sort of mailing list. If an alias turns the incoming
2249 address into just one address (e.g. J.Caesar->jc44) you may well want to
2250 carry on verifying the generated address to ensure it is valid when
2251 checking incoming mail. If aliasing generates multiple addresses, you
2252 probably don't want to do this. Exim therefore treats the generation of
2253 just a single new address as a special case, and continues on to verify the
2254 generated address. */
2255
2256 if (!full_info && /* Stop if short info wanted AND */
2257 (((addr_new == NULL || /* No new address OR */
2258 addr_new->next != NULL || /* More than one new address OR */
2259 testflag(addr_new, af_pfr))) /* New address is pfr */
2260 || /* OR */
2261 (addr_new != NULL && /* At least one new address AND */
2262 success_on_redirect))) /* success_on_redirect is set */
2263 {
2264 if (f != NULL) fprintf(f, "%s %s\n", address,
2265 address_test_mode? "is deliverable" : "verified");
2266
2267 /* If we have carried on to verify a child address, we want the value
2268 of $address_data to be that of the child */
2269
2270 vaddr->prop.address_data = addr->prop.address_data;
2271 yield = OK;
2272 goto out;
2273 }
2274 }
2275 } /* Loop for generated addresses */
2276
2277 /* Display the full results of the successful routing, including any generated
2278 addresses. Control gets here only when full_info is set, which requires f not
2279 to be NULL, and this occurs only when a top-level verify is called with the
2280 debugging switch on.
2281
2282 If there are no local and no remote addresses, and there were no pipes, files,
2283 or autoreplies, and there were no errors or deferments, the message is to be
2284 discarded, usually because of the use of :blackhole: in an alias file. */
2285
2286 if (allok && addr_local == NULL && addr_remote == NULL)
2287 {
2288 fprintf(f, "mail to %s is discarded\n", address);
2289 goto out;
2290 }
2291
2292 for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
2293 {
2294 while (addr_list != NULL)
2295 {
2296 address_item *addr = addr_list;
2297 address_item *p = addr->parent;
2298 addr_list = addr->next;
2299
2300 fprintf(f, "%s", CS addr->address);
2301 #ifdef EXPERIMENTAL_SRS
2302 if(addr->prop.srs_sender)
2303 fprintf(f, " [srs = %s]", addr->prop.srs_sender);
2304 #endif
2305
2306 /* If the address is a duplicate, show something about it. */
2307
2308 if (!testflag(addr, af_pfr))
2309 {
2310 tree_node *tnode;
2311 if ((tnode = tree_search(tree_duplicates, addr->unique)) != NULL)
2312 fprintf(f, " [duplicate, would not be delivered]");
2313 else tree_add_duplicate(addr->unique, addr);
2314 }
2315
2316 /* Now show its parents */
2317
2318 while (p != NULL)
2319 {
2320 fprintf(f, "\n <-- %s", p->address);
2321 p = p->parent;
2322 }
2323 fprintf(f, "\n ");
2324
2325 /* Show router, and transport */
2326
2327 fprintf(f, "router = %s, ", addr->router->name);
2328 fprintf(f, "transport = %s\n", (addr->transport == NULL)? US"unset" :
2329 addr->transport->name);
2330
2331 /* Show any hosts that are set up by a router unless the transport
2332 is going to override them; fiddle a bit to get a nice format. */
2333
2334 if (addr->host_list != NULL && addr->transport != NULL &&
2335 !addr->transport->overrides_hosts)
2336 {
2337 host_item *h;
2338 int maxlen = 0;
2339 int maxaddlen = 0;
2340 for (h = addr->host_list; h != NULL; h = h->next)
2341 {
2342 int len = Ustrlen(h->name);
2343 if (len > maxlen) maxlen = len;
2344 len = (h->address != NULL)? Ustrlen(h->address) : 7;
2345 if (len > maxaddlen) maxaddlen = len;
2346 }
2347 for (h = addr->host_list; h != NULL; h = h->next)
2348 {
2349 int len = Ustrlen(h->name);
2350 fprintf(f, " host %s ", h->name);
2351 while (len++ < maxlen) fprintf(f, " ");
2352 if (h->address != NULL)
2353 {
2354 fprintf(f, "[%s] ", h->address);
2355 len = Ustrlen(h->address);
2356 }
2357 else if (!addr->transport->info->local) /* Omit [unknown] for local */
2358 {
2359 fprintf(f, "[unknown] ");
2360 len = 7;
2361 }
2362 else len = -3;
2363 while (len++ < maxaddlen) fprintf(f," ");
2364 if (h->mx >= 0) fprintf(f, "MX=%d", h->mx);
2365 if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port);
2366 if (running_in_test_harness)
2367 #ifndef DISABLE_DNSSEC
2368 fprintf(f, " ad=%s", h->dnssec==DS_YES ? "yes" : "no");
2369 #else
2370 fprintf(f, " ad=no");
2371 #endif
2372 if (h->status == hstatus_unusable) fprintf(f, " ** unusable **");
2373 fprintf(f, "\n");
2374 }
2375 }
2376 }
2377 }
2378
2379 /* Yield will be DEFER or FAIL if any one address has, only for full_info (which is
2380 the -bv or -bt case). */
2381
2382 out:
2383 tls_modify_variables(&tls_in);
2384
2385 return yield;
2386 }
2387
2388
2389
2390
2391 /*************************************************
2392 * Check headers for syntax errors *
2393 *************************************************/
2394
2395 /* This function checks those header lines that contain addresses, and verifies
2396 that all the addresses therein are syntactially correct.
2397
2398 Arguments:
2399 msgptr where to put an error message
2400
2401 Returns: OK
2402 FAIL
2403 */
2404
2405 int
2406 verify_check_headers(uschar **msgptr)
2407 {
2408 header_line *h;
2409 uschar *colon, *s;
2410 int yield = OK;
2411
2412 for (h = header_list; h != NULL && yield == OK; h = h->next)
2413 {
2414 if (h->type != htype_from &&
2415 h->type != htype_reply_to &&
2416 h->type != htype_sender &&
2417 h->type != htype_to &&
2418 h->type != htype_cc &&
2419 h->type != htype_bcc)
2420 continue;
2421
2422 colon = Ustrchr(h->text, ':');
2423 s = colon + 1;
2424 while (isspace(*s)) s++;
2425
2426 /* Loop for multiple addresses in the header, enabling group syntax. Note
2427 that we have to reset this after the header has been scanned. */
2428
2429 parse_allow_group = TRUE;
2430
2431 while (*s != 0)
2432 {
2433 uschar *ss = parse_find_address_end(s, FALSE);
2434 uschar *recipient, *errmess;
2435 int terminator = *ss;
2436 int start, end, domain;
2437
2438 /* Temporarily terminate the string at this point, and extract the
2439 operative address within, allowing group syntax. */
2440
2441 *ss = 0;
2442 recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
2443 *ss = terminator;
2444
2445 /* Permit an unqualified address only if the message is local, or if the
2446 sending host is configured to be permitted to send them. */
2447
2448 if (recipient != NULL && domain == 0)
2449 {
2450 if (h->type == htype_from || h->type == htype_sender)
2451 {
2452 if (!allow_unqualified_sender) recipient = NULL;
2453 }
2454 else
2455 {
2456 if (!allow_unqualified_recipient) recipient = NULL;
2457 }
2458 if (recipient == NULL) errmess = US"unqualified address not permitted";
2459 }
2460
2461 /* It's an error if no address could be extracted, except for the special
2462 case of an empty address. */
2463
2464 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2465 {
2466 uschar *verb = US"is";
2467 uschar *t = ss;
2468 uschar *tt = colon;
2469 int len;
2470
2471 /* Arrange not to include any white space at the end in the
2472 error message or the header name. */
2473
2474 while (t > s && isspace(t[-1])) t--;
2475 while (tt > h->text && isspace(tt[-1])) tt--;
2476
2477 /* Add the address that failed to the error message, since in a
2478 header with very many addresses it is sometimes hard to spot
2479 which one is at fault. However, limit the amount of address to
2480 quote - cases have been seen where, for example, a missing double
2481 quote in a humungous To: header creates an "address" that is longer
2482 than string_sprintf can handle. */
2483
2484 len = t - s;
2485 if (len > 1024)
2486 {
2487 len = 1024;
2488 verb = US"begins";
2489 }
2490
2491 /* deconst cast ok as we're passing a non-const to string_printing() */
2492 *msgptr = US string_printing(
2493 string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s",
2494 errmess, tt - h->text, h->text, verb, len, s));
2495
2496 yield = FAIL;
2497 break; /* Out of address loop */
2498 }
2499
2500 /* Advance to the next address */
2501
2502 s = ss + (terminator? 1:0);
2503 while (isspace(*s)) s++;
2504 } /* Next address */
2505
2506 parse_allow_group = FALSE;
2507 parse_found_group = FALSE;
2508 } /* Next header unless yield has been set FALSE */
2509
2510 return yield;
2511 }
2512
2513
2514 /*************************************************
2515 * Check header names for 8-bit characters *
2516 *************************************************/
2517
2518 /* This function checks for invalid charcters in header names. See
2519 RFC 5322, 2.2. and RFC 6532, 3.
2520
2521 Arguments:
2522 msgptr where to put an error message
2523
2524 Returns: OK
2525 FAIL
2526 */
2527
2528 int
2529 verify_check_header_names_ascii(uschar **msgptr)
2530 {
2531 header_line *h;
2532 uschar *colon, *s;
2533
2534 for (h = header_list; h != NULL; h = h->next)
2535 {
2536 colon = Ustrchr(h->text, ':');
2537 for(s = h->text; s < colon; s++)
2538 {
2539 if ((*s < 33) || (*s > 126))
2540 {
2541 *msgptr = string_sprintf("Invalid character in header \"%.*s\" found",
2542 colon - h->text, h->text);
2543 return FAIL;
2544 }
2545 }
2546 }
2547 return OK;
2548 }
2549
2550 /*************************************************
2551 * Check for blind recipients *
2552 *************************************************/
2553
2554 /* This function checks that every (envelope) recipient is mentioned in either
2555 the To: or Cc: header lines, thus detecting blind carbon copies.
2556
2557 There are two ways of scanning that could be used: either scan the header lines
2558 and tick off the recipients, or scan the recipients and check the header lines.
2559 The original proposed patch did the former, but I have chosen to do the latter,
2560 because (a) it requires no memory and (b) will use fewer resources when there
2561 are many addresses in To: and/or Cc: and only one or two envelope recipients.
2562
2563 Arguments: none
2564 Returns: OK if there are no blind recipients
2565 FAIL if there is at least one blind recipient
2566 */
2567
2568 int
2569 verify_check_notblind(void)
2570 {
2571 int i;
2572 for (i = 0; i < recipients_count; i++)
2573 {
2574 header_line *h;
2575 BOOL found = FALSE;
2576 uschar *address = recipients_list[i].address;
2577
2578 for (h = header_list; !found && h != NULL; h = h->next)
2579 {
2580 uschar *colon, *s;
2581
2582 if (h->type != htype_to && h->type != htype_cc) continue;
2583
2584 colon = Ustrchr(h->text, ':');
2585 s = colon + 1;
2586 while (isspace(*s)) s++;
2587
2588 /* Loop for multiple addresses in the header, enabling group syntax. Note
2589 that we have to reset this after the header has been scanned. */
2590
2591 parse_allow_group = TRUE;
2592
2593 while (*s != 0)
2594 {
2595 uschar *ss = parse_find_address_end(s, FALSE);
2596 uschar *recipient,*errmess;
2597 int terminator = *ss;
2598 int start, end, domain;
2599
2600 /* Temporarily terminate the string at this point, and extract the
2601 operative address within, allowing group syntax. */
2602
2603 *ss = 0;
2604 recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
2605 *ss = terminator;
2606
2607 /* If we found a valid recipient that has a domain, compare it with the
2608 envelope recipient. Local parts are compared case-sensitively, domains
2609 case-insensitively. By comparing from the start with length "domain", we
2610 include the "@" at the end, which ensures that we are comparing the whole
2611 local part of each address. */
2612
2613 if (recipient != NULL && domain != 0)
2614 {
2615 found = Ustrncmp(recipient, address, domain) == 0 &&
2616 strcmpic(recipient + domain, address + domain) == 0;
2617 if (found) break;
2618 }
2619
2620 /* Advance to the next address */
2621
2622 s = ss + (terminator? 1:0);
2623 while (isspace(*s)) s++;
2624 } /* Next address */
2625
2626 parse_allow_group = FALSE;
2627 parse_found_group = FALSE;
2628 } /* Next header (if found is false) */
2629
2630 if (!found) return FAIL;
2631 } /* Next recipient */
2632
2633 return OK;
2634 }
2635
2636
2637
2638 /*************************************************
2639 * Find if verified sender *
2640 *************************************************/
2641
2642 /* Usually, just a single address is verified as the sender of the message.
2643 However, Exim can be made to verify other addresses as well (often related in
2644 some way), and this is useful in some environments. There may therefore be a
2645 chain of such addresses that have previously been tested. This function finds
2646 whether a given address is on the chain.
2647
2648 Arguments: the address to be verified
2649 Returns: pointer to an address item, or NULL
2650 */
2651
2652 address_item *
2653 verify_checked_sender(uschar *sender)
2654 {
2655 address_item *addr;
2656 for (addr = sender_verified_list; addr != NULL; addr = addr->next)
2657 if (Ustrcmp(sender, addr->address) == 0) break;
2658 return addr;
2659 }
2660
2661
2662
2663
2664
2665 /*************************************************
2666 * Get valid header address *
2667 *************************************************/
2668
2669 /* Scan the originator headers of the message, looking for an address that
2670 verifies successfully. RFC 822 says:
2671
2672 o The "Sender" field mailbox should be sent notices of
2673 any problems in transport or delivery of the original
2674 messages. If there is no "Sender" field, then the
2675 "From" field mailbox should be used.
2676
2677 o If the "Reply-To" field exists, then the reply should
2678 go to the addresses indicated in that field and not to
2679 the address(es) indicated in the "From" field.
2680
2681 So we check a Sender field if there is one, else a Reply_to field, else a From
2682 field. As some strange messages may have more than one of these fields,
2683 especially if they are resent- fields, check all of them if there is more than
2684 one.
2685
2686 Arguments:
2687 user_msgptr points to where to put a user error message
2688 log_msgptr points to where to put a log error message
2689 callout timeout for callout check (passed to verify_address())
2690 callout_overall overall callout timeout (ditto)
2691 callout_connect connect callout timeout (ditto)
2692 se_mailfrom mailfrom for verify; NULL => ""
2693 pm_mailfrom sender for pm callout check (passed to verify_address())
2694 options callout options (passed to verify_address())
2695 verrno where to put the address basic_errno
2696
2697 If log_msgptr is set to something without setting user_msgptr, the caller
2698 normally uses log_msgptr for both things.
2699
2700 Returns: result of the verification attempt: OK, FAIL, or DEFER;
2701 FAIL is given if no appropriate headers are found
2702 */
2703
2704 int
2705 verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr,
2706 int callout, int callout_overall, int callout_connect, uschar *se_mailfrom,
2707 uschar *pm_mailfrom, int options, int *verrno)
2708 {
2709 static int header_types[] = { htype_sender, htype_reply_to, htype_from };
2710 BOOL done = FALSE;
2711 int yield = FAIL;
2712 int i;
2713
2714 for (i = 0; i < 3 && !done; i++)
2715 {
2716 header_line *h;
2717 for (h = header_list; h != NULL && !done; h = h->next)
2718 {
2719 int terminator, new_ok;
2720 uschar *s, *ss, *endname;
2721
2722 if (h->type != header_types[i]) continue;
2723 s = endname = Ustrchr(h->text, ':') + 1;
2724
2725 /* Scan the addresses in the header, enabling group syntax. Note that we
2726 have to reset this after the header has been scanned. */
2727
2728 parse_allow_group = TRUE;
2729
2730 while (*s != 0)
2731 {
2732 address_item *vaddr;
2733
2734 while (isspace(*s) || *s == ',') s++;
2735 if (*s == 0) break; /* End of header */
2736
2737 ss = parse_find_address_end(s, FALSE);
2738
2739 /* The terminator is a comma or end of header, but there may be white
2740 space preceding it (including newline for the last address). Move back
2741 past any white space so we can check against any cached envelope sender
2742 address verifications. */
2743
2744 while (isspace(ss[-1])) ss--;
2745 terminator = *ss;
2746 *ss = 0;
2747
2748 HDEBUG(D_verify) debug_printf("verifying %.*s header address %s\n",
2749 (int)(endname - h->text), h->text, s);
2750
2751 /* See if we have already verified this address as an envelope sender,
2752 and if so, use the previous answer. */
2753
2754 vaddr = verify_checked_sender(s);
2755
2756 if (vaddr != NULL && /* Previously checked */
2757 (callout <= 0 || /* No callout needed; OR */
2758 vaddr->special_action > 256)) /* Callout was done */
2759 {
2760 new_ok = vaddr->special_action & 255;
2761 HDEBUG(D_verify) debug_printf("previously checked as envelope sender\n");
2762 *ss = terminator; /* Restore shortened string */
2763 }
2764
2765 /* Otherwise we run the verification now. We must restore the shortened
2766 string before running the verification, so the headers are correct, in
2767 case there is any rewriting. */
2768
2769 else
2770 {
2771 int start, end, domain;
2772 uschar *address = parse_extract_address(s, log_msgptr, &start, &end,
2773 &domain, FALSE);
2774
2775 *ss = terminator;
2776
2777 /* If we found an empty address, just carry on with the next one, but
2778 kill the message. */
2779
2780 if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0)
2781 {
2782 *log_msgptr = NULL;
2783 s = ss;
2784 continue;
2785 }
2786
2787 /* If verification failed because of a syntax error, fail this
2788 function, and ensure that the failing address gets added to the error
2789 message. */
2790
2791 if (address == NULL)
2792 {
2793 new_ok = FAIL;
2794 while (ss > s && isspace(ss[-1])) ss--;
2795 *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
2796 "scanning for sender: %s in \"%.*s\"",
2797 endname - h->text, h->text, *log_msgptr, ss - s, s);
2798 yield = FAIL;
2799 done = TRUE;
2800 break;
2801 }
2802
2803 /* Else go ahead with the sender verification. But it isn't *the*
2804 sender of the message, so set vopt_fake_sender to stop sender_address
2805 being replaced after rewriting or qualification. */
2806
2807 else
2808 {
2809 vaddr = deliver_make_addr(address, FALSE);
2810 new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender,
2811 callout, callout_overall, callout_connect, se_mailfrom,
2812 pm_mailfrom, NULL);
2813 }
2814 }
2815
2816 /* We now have the result, either newly found, or cached. If we are
2817 giving out error details, set a specific user error. This means that the
2818 last of these will be returned to the user if all three fail. We do not
2819 set a log message - the generic one below will be used. */
2820
2821 if (new_ok != OK)
2822 {
2823 *verrno = vaddr->basic_errno;
2824 if (smtp_return_error_details)
2825 {
2826 *user_msgptr = string_sprintf("Rejected after DATA: "
2827 "could not verify \"%.*s\" header address\n%s: %s",
2828 endname - h->text, h->text, vaddr->address, vaddr->message);
2829 }
2830 }
2831
2832 /* Success or defer */
2833
2834 if (new_ok == OK)
2835 {
2836 yield = OK;
2837 done = TRUE;
2838 break;
2839 }
2840
2841 if (new_ok == DEFER) yield = DEFER;
2842
2843 /* Move on to any more addresses in the header */
2844
2845 s = ss;
2846 } /* Next address */
2847
2848 parse_allow_group = FALSE;
2849 parse_found_group = FALSE;
2850 } /* Next header, unless done */
2851 } /* Next header type unless done */
2852
2853 if (yield == FAIL && *log_msgptr == NULL)
2854 *log_msgptr = US"there is no valid sender in any header line";
2855
2856 if (yield == DEFER && *log_msgptr == NULL)
2857 *log_msgptr = US"all attempts to verify a sender in a header line deferred";
2858
2859 return yield;
2860 }
2861
2862
2863
2864
2865 /*************************************************
2866 * Get RFC 1413 identification *
2867 *************************************************/
2868
2869 /* Attempt to get an id from the sending machine via the RFC 1413 protocol. If
2870 the timeout is set to zero, then the query is not done. There may also be lists
2871 of hosts and nets which are exempt. To guard against malefactors sending
2872 non-printing characters which could, for example, disrupt a message's headers,
2873 make sure the string consists of printing characters only.
2874
2875 Argument:
2876 port the port to connect to; usually this is IDENT_PORT (113), but when
2877 running in the test harness with -bh a different value is used.
2878
2879 Returns: nothing
2880
2881 Side effect: any received ident value is put in sender_ident (NULL otherwise)
2882 */
2883
2884 void
2885 verify_get_ident(int port)
2886 {
2887 int sock, host_af, qlen;
2888 int received_sender_port, received_interface_port, n;
2889 uschar *p;
2890 uschar buffer[2048];
2891
2892 /* Default is no ident. Check whether we want to do an ident check for this
2893 host. */
2894
2895 sender_ident = NULL;
2896 if (rfc1413_query_timeout <= 0 || verify_check_host(&rfc1413_hosts) != OK)
2897 return;
2898
2899 DEBUG(D_ident) debug_printf("doing ident callback\n");
2900
2901 /* Set up a connection to the ident port of the remote host. Bind the local end
2902 to the incoming interface address. If the sender host address is an IPv6
2903 address, the incoming interface address will also be IPv6. */
2904
2905 host_af = (Ustrchr(sender_host_address, ':') == NULL)? AF_INET : AF_INET6;
2906 sock = ip_socket(SOCK_STREAM, host_af);
2907 if (sock < 0) return;
2908
2909 if (ip_bind(sock, host_af, interface_address, 0) < 0)
2910 {
2911 DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n",
2912 strerror(errno));
2913 goto END_OFF;
2914 }
2915
2916 if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout)
2917 < 0)
2918 {
2919 if (errno == ETIMEDOUT && (log_extra_selector & LX_ident_timeout) != 0)
2920 {
2921 log_write(0, LOG_MAIN, "ident connection to %s timed out",
2922 sender_host_address);
2923 }
2924 else
2925 {
2926 DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n",
2927 sender_host_address, strerror(errno));
2928 }
2929 goto END_OFF;
2930 }
2931
2932 /* Construct and send the query. */
2933
2934 sprintf(CS buffer, "%d , %d\r\n", sender_host_port, interface_port);
2935 qlen = Ustrlen(buffer);
2936 if (send(sock, buffer, qlen, 0) < 0)
2937 {
2938 DEBUG(D_ident) debug_printf("ident send failed: %s\n", strerror(errno));
2939 goto END_OFF;
2940 }
2941
2942 /* Read a response line. We put it into the rest of the buffer, using several
2943 recv() calls if necessary. */
2944
2945 p = buffer + qlen;
2946
2947 for (;;)
2948 {
2949 uschar *pp;
2950 int count;
2951 int size = sizeof(buffer) - (p - buffer);
2952
2953 if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */
2954 count = ip_recv(sock, p, size, rfc1413_query_timeout);
2955 if (count <= 0) goto END_OFF; /* Read error or EOF */
2956
2957 /* Scan what we just read, to see if we have reached the terminating \r\n. Be
2958 generous, and accept a plain \n terminator as well. The only illegal
2959 character is 0. */
2960
2961 for (pp = p; pp < p + count; pp++)
2962 {
2963 if (*pp == 0) goto END_OFF; /* Zero octet not allowed */
2964 if (*pp == '\n')
2965 {
2966 if (pp[-1] == '\r') pp--;
2967 *pp = 0;
2968 goto GOT_DATA; /* Break out of both loops */
2969 }
2970 }
2971
2972 /* Reached the end of the data without finding \n. Let the loop continue to
2973 read some more, if there is room. */
2974
2975 p = pp;
2976 }
2977
2978 GOT_DATA:
2979
2980 /* We have received a line of data. Check it carefully. It must start with the
2981 same two port numbers that we sent, followed by data as defined by the RFC. For
2982 example,
2983
2984 12345 , 25 : USERID : UNIX :root
2985
2986 However, the amount of white space may be different to what we sent. In the
2987 "osname" field there may be several sub-fields, comma separated. The data we
2988 actually want to save follows the third colon. Some systems put leading spaces
2989 in it - we discard those. */
2990
2991 if (sscanf(CS buffer + qlen, "%d , %d%n", &received_sender_port,
2992 &received_interface_port, &n) != 2 ||
2993 received_sender_port != sender_host_port ||
2994 received_interface_port != interface_port)
2995 goto END_OFF;
2996
2997 p = buffer + qlen + n;
2998 while(isspace(*p)) p++;
2999 if (*p++ != ':') goto END_OFF;
3000 while(isspace(*p)) p++;
3001 if (Ustrncmp(p, "USERID", 6) != 0) goto END_OFF;
3002 p += 6;
3003 while(isspace(*p)) p++;
3004 if (*p++ != ':') goto END_OFF;
3005 while (*p != 0 && *p != ':') p++;
3006 if (*p++ == 0) goto END_OFF;
3007 while(isspace(*p)) p++;
3008 if (*p == 0) goto END_OFF;
3009
3010 /* The rest of the line is the data we want. We turn it into printing
3011 characters when we save it, so that it cannot mess up the format of any logging
3012 or Received: lines into which it gets inserted. We keep a maximum of 127
3013 characters. The deconst cast is ok as we fed a nonconst to string_printing() */
3014
3015 sender_ident = US string_printing(string_copyn(p, 127));
3016 DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident);
3017
3018 END_OFF:
3019 (void)close(sock);
3020 return;
3021 }
3022
3023
3024
3025
3026 /*************************************************
3027 * Match host to a single host-list item *
3028 *************************************************/
3029
3030 /* This function compares a host (name or address) against a single item
3031 from a host list. The host name gets looked up if it is needed and is not
3032 already known. The function is called from verify_check_this_host() via
3033 match_check_list(), which is why most of its arguments are in a single block.
3034
3035 Arguments:
3036 arg the argument block (see below)
3037 ss the host-list item
3038 valueptr where to pass back looked up data, or NULL
3039 error for error message when returning ERROR
3040
3041 The block contains:
3042 host_name (a) the host name, or
3043 (b) NULL, implying use sender_host_name and
3044 sender_host_aliases, looking them up if required, or
3045 (c) the empty string, meaning that only IP address matches
3046 are permitted
3047 host_address the host address
3048 host_ipv4 the IPv4 address taken from an IPv6 one
3049
3050 Returns: OK matched
3051 FAIL did not match
3052 DEFER lookup deferred
3053 ERROR (a) failed to find the host name or IP address, or
3054 (b) unknown lookup type specified, or
3055 (c) host name encountered when only IP addresses are
3056 being matched
3057 */
3058
3059 int
3060 check_host(void *arg, const uschar *ss, const uschar **valueptr, uschar **error)
3061 {
3062 check_host_block *cb = (check_host_block *)arg;
3063 int mlen = -1;
3064 int maskoffset;
3065 BOOL iplookup = FALSE;
3066 BOOL isquery = FALSE;
3067 BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0;
3068 const uschar *t;
3069 uschar *semicolon;
3070 uschar **aliases;
3071
3072 /* Optimize for the special case when the pattern is "*". */
3073
3074 if (*ss == '*' && ss[1] == 0) return OK;
3075
3076 /* If the pattern is empty, it matches only in the case when there is no host -
3077 this can occur in ACL checking for SMTP input using the -bs option. In this
3078 situation, the host address is the empty string. */
3079
3080 if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL;
3081 if (*ss == 0) return FAIL;
3082
3083 /* If the pattern is precisely "@" then match against the primary host name,
3084 provided that host name matching is permitted; if it's "@[]" match against the
3085 local host's IP addresses. */
3086
3087 if (*ss == '@')
3088 {
3089 if (ss[1] == 0)
3090 {
3091 if (isiponly) return ERROR;
3092 ss = primary_hostname;
3093 }
3094 else if (Ustrcmp(ss, "@[]") == 0)
3095 {
3096 ip_address_item *ip;
3097 for (ip = host_find_interfaces(); ip != NULL; ip = ip->next)
3098 if (Ustrcmp(ip->address, cb->host_address) == 0) return OK;
3099 return FAIL;
3100 }
3101 }
3102
3103 /* If the pattern is an IP address, optionally followed by a bitmask count, do
3104 a (possibly masked) comparision with the current IP address. */
3105
3106 if (string_is_ip_address(ss, &maskoffset) != 0)
3107 return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL);
3108
3109 /* The pattern is not an IP address. A common error that people make is to omit
3110 one component of an IPv4 address, either by accident, or believing that, for
3111 example, 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,
3112 which it isn't. (Those applications that do accept 1.2.3 as an IP address
3113 interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an
3114 ancient specification.) To aid in debugging these cases, we give a specific
3115 error if the pattern contains only digits and dots or contains a slash preceded
3116 only by digits and dots (a slash at the start indicates a file name and of
3117 course slashes may be present in lookups, but not preceded only by digits and
3118 dots). */
3119
3120 for (t = ss; isdigit(*t) || *t == '.'; t++);
3121 if (*t == 0 || (*t == '/' && t != ss))
3122 {
3123 *error = US"malformed IPv4 address or address mask";
3124 return ERROR;
3125 }
3126
3127 /* See if there is a semicolon in the pattern */
3128
3129 semicolon = Ustrchr(ss, ';');
3130
3131 /* If we are doing an IP address only match, then all lookups must be IP
3132 address lookups, even if there is no "net-". */
3133
3134 if (isiponly)
3135 {
3136 iplookup = semicolon != NULL;
3137 }
3138
3139 /* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is
3140 a lookup on a masked IP network, in textual form. We obey this code even if we
3141 have already set iplookup, so as to skip over the "net-" prefix and to set the
3142 mask length. The net- stuff really only applies to single-key lookups where the
3143 key is implicit. For query-style lookups the key is specified in the query.
3144 From release 4.30, the use of net- for query style is no longer needed, but we
3145 retain it for backward compatibility. */
3146
3147 if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL)
3148 {
3149 mlen = 0;
3150 for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0';
3151 if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */
3152 iplookup = (*t++ == '-');
3153 }
3154 else t = ss;
3155
3156 /* Do the IP address lookup if that is indeed what we have */
3157
3158 if (iplookup)
3159 {
3160 int insize;
3161 int search_type;
3162 int incoming[4];
3163 void *handle;
3164 uschar *filename, *key, *result;
3165 uschar buffer[64];
3166
3167 /* Find the search type */
3168
3169 search_type = search_findtype(t, semicolon - t);
3170
3171 if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
3172 search_error_message);
3173
3174 /* Adjust parameters for the type of lookup. For a query-style lookup, there
3175 is no file name, and the "key" is just the query. For query-style with a file
3176 name, we have to fish the file off the start of the query. For a single-key
3177 lookup, the key is the current IP address, masked appropriately, and
3178 reconverted to text form, with the mask appended. For IPv6 addresses, specify
3179 dot separators instead of colons, except when the lookup type is "iplsearch".
3180 */
3181
3182 if (mac_islookup(search_type, lookup_absfilequery))
3183 {
3184 filename = semicolon + 1;
3185 key = filename;
3186 while (*key != 0 && !isspace(*key)) key++;
3187 filename = string_copyn(filename, key - filename);
3188 while (isspace(*key)) key++;
3189 }
3190 else if (mac_islookup(search_type, lookup_querystyle))
3191 {
3192 filename = NULL;
3193 key = semicolon + 1;
3194 }
3195 else /* Single-key style */
3196 {
3197 int sep = (Ustrcmp(lookup_list[search_type]->name, "iplsearch") == 0)?
3198 ':' : '.';
3199 insize = host_aton(cb->host_address, incoming);
3200 host_mask(insize, incoming, mlen);
3201 (void)host_nmtoa(insize, incoming, mlen, buffer, sep);
3202 key = buffer;
3203 filename = semicolon + 1;
3204 }
3205
3206 /* Now do the actual lookup; note that there is no search_close() because
3207 of the caching arrangements. */
3208
3209 handle = search_open(filename, search_type, 0, NULL, NULL);
3210 if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
3211 search_error_message);
3212 result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL);
3213 if (valueptr != NULL) *valueptr = result;
3214 return (result != NULL)? OK : search_find_defer? DEFER: FAIL;
3215 }
3216
3217 /* The pattern is not an IP address or network reference of any kind. That is,
3218 it is a host name pattern. If this is an IP only match, there's an error in the
3219 host list. */
3220
3221 if (isiponly)
3222 {
3223 *error = US"cannot match host name in match_ip list";
3224 return ERROR;
3225 }
3226
3227 /* Check the characters of the pattern to see if they comprise only letters,
3228 digits, full stops, and hyphens (the constituents of domain names). Allow
3229 underscores, as they are all too commonly found. Sigh. Also, if
3230 allow_utf8_domains is set, allow top-bit characters. */
3231
3232 for (t = ss; *t != 0; t++)
3233 if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' &&
3234 (!allow_utf8_domains || *t < 128)) break;
3235
3236 /* If the pattern is a complete domain name, with no fancy characters, look up
3237 its IP address and match against that. Note that a multi-homed host will add
3238 items to the chain. */
3239
3240 if (*t == 0)
3241 {
3242 int rc;
3243 host_item h;
3244 h.next = NULL;
3245 h.name = ss;
3246 h.address = NULL;
3247 h.mx = MX_NONE;
3248
3249 /* Using byname rather than bydns here means we cannot determine dnssec
3250 status. On the other hand it is unclear how that could be either
3251 propagated up or enforced. */
3252
3253 rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE);
3254 if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
3255 {
3256 host_item *hh;
3257 for (hh = &h; hh != NULL; hh = hh->next)
3258 {
3259 if (host_is_in_net(hh->address, cb->host_address, 0)) return OK;
3260 }
3261 return FAIL;
3262 }
3263 if (rc == HOST_FIND_AGAIN) return DEFER;
3264 *error = string_sprintf("failed to find IP address for %s", ss);
3265 return ERROR;
3266 }
3267
3268 /* Almost all subsequent comparisons require the host name, and can be done
3269 using the general string matching function. When this function is called for
3270 outgoing hosts, the name is always given explicitly. If it is NULL, it means we
3271 must use sender_host_name and its aliases, looking them up if necessary. */
3272
3273 if (cb->host_name != NULL) /* Explicit host name given */
3274 return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE,
3275 valueptr);
3276
3277 /* Host name not given; in principle we need the sender host name and its
3278 aliases. However, for query-style lookups, we do not need the name if the
3279 query does not contain $sender_host_name. From release 4.23, a reference to
3280 $sender_host_name causes it to be looked up, so we don't need to do the lookup
3281 on spec. */
3282
3283 if ((semicolon = Ustrchr(ss, ';')) != NULL)
3284 {
3285 const uschar *affix;
3286 int partial, affixlen, starflags, id;
3287
3288 *semicolon = 0;
3289 id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags);
3290 *semicolon=';';
3291
3292 if (id < 0) /* Unknown lookup type */
3293 {
3294 log_write(0, LOG_MAIN|LOG_PANIC, "%s in host list item \"%s\"",
3295 search_error_message, ss);
3296 return DEFER;
3297 }
3298 isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery);
3299 }
3300
3301 if (isquery)
3302 {
3303 switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr))
3304 {
3305 case OK: return OK;
3306 case DEFER: return DEFER;
3307 default: return FAIL;
3308 }
3309 }
3310
3311 /* Not a query-style lookup; must ensure the host name is present, and then we
3312 do a check on the name and all its aliases. */
3313
3314 if (sender_host_name == NULL)
3315 {
3316 HDEBUG(D_host_lookup)
3317 debug_printf("sender host name required, to match against %s\n", ss);
3318 if (host_lookup_failed || host_name_lookup() != OK)
3319 {
3320 *error = string_sprintf("failed to find host name for %s",
3321 sender_host_address);;
3322 return ERROR;
3323 }
3324 host_build_sender_fullhost();
3325 }
3326
3327 /* Match on the sender host name, using the general matching function */
3328
3329 switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE,
3330 valueptr))
3331 {
3332 case OK: return OK;
3333 case DEFER: return DEFER;
3334 }
3335
3336 /* If there are aliases, try matching on them. */
3337
3338 aliases = sender_host_aliases;
3339 while (*aliases != NULL)
3340 {
3341 switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr))
3342 {
3343 case OK: return OK;
3344 case DEFER: return DEFER;
3345 }
3346 }
3347 return FAIL;
3348 }
3349
3350
3351
3352
3353 /*************************************************
3354 * Check a specific host matches a host list *
3355 *************************************************/
3356
3357 /* This function is passed a host list containing items in a number of
3358 different formats and the identity of a host. Its job is to determine whether
3359 the given host is in the set of hosts defined by the list. The host name is
3360 passed as a pointer so that it can be looked up if needed and not already
3361 known. This is commonly the case when called from verify_check_host() to check
3362 an incoming connection. When called from elsewhere the host name should usually
3363 be set.
3364
3365 This function is now just a front end to match_check_list(), which runs common
3366 code for scanning a list. We pass it the check_host() function to perform a
3367 single test.
3368
3369 Arguments:
3370 listptr pointer to the host list
3371 cache_bits pointer to cache for named lists, or NULL
3372 host_name the host name or NULL, implying use sender_host_name and
3373 sender_host_aliases, looking them up if required
3374 host_address the IP address
3375 valueptr if not NULL, data from a lookup is passed back here
3376
3377 Returns: OK if the host is in the defined set
3378 FAIL if the host is not in the defined set,
3379 DEFER if a data lookup deferred (not a host lookup)
3380
3381 If the host name was needed in order to make a comparison, and could not be
3382 determined from the IP address, the result is FAIL unless the item
3383 "+allow_unknown" was met earlier in the list, in which case OK is returned. */
3384
3385 int
3386 verify_check_this_host(const uschar **listptr, unsigned int *cache_bits,
3387 const uschar *host_name, const uschar *host_address, const uschar **valueptr)
3388 {
3389 int rc;
3390 unsigned int *local_cache_bits = cache_bits;
3391 const uschar *save_host_address = deliver_host_address;
3392 check_host_block cb;
3393 cb.host_name = host_name;
3394 cb.host_address = host_address;
3395
3396 if (valueptr != NULL) *valueptr = NULL;
3397
3398 /* If the host address starts off ::ffff: it is an IPv6 address in
3399 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
3400 addresses. */
3401
3402 cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)?
3403 host_address + 7 : host_address;
3404
3405 /* During the running of the check, put the IP address into $host_address. In
3406 the case of calls from the smtp transport, it will already be there. However,
3407 in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
3408 the safe side, any existing setting is preserved, though as I write this
3409 (November 2004) I can't see any cases where it is actually needed. */
3410
3411 deliver_host_address = host_address;
3412 rc = match_check_list(
3413 listptr, /* the list */
3414 0, /* separator character */
3415 &hostlist_anchor, /* anchor pointer */
3416 &local_cache_bits, /* cache pointer */
3417 check_host, /* function for testing */
3418 &cb, /* argument for function */
3419 MCL_HOST, /* type of check */
3420 (host_address == sender_host_address)?
3421 US"host" : host_address, /* text for debugging */
3422 valueptr); /* where to pass back data */
3423 deliver_host_address = save_host_address;
3424 return rc;
3425 }
3426
3427
3428
3429
3430 /*************************************************
3431 * Check the given host item matches a list *
3432 *************************************************/
3433 int
3434 verify_check_given_host(uschar **listptr, host_item *host)
3435 {
3436 return verify_check_this_host(CUSS listptr, NULL, host->name, host->address, NULL);
3437 }
3438
3439 /*************************************************
3440 * Check the remote host matches a list *
3441 *************************************************/
3442
3443 /* This is a front end to verify_check_this_host(), created because checking