tidying
[exim.git] / src / src / verify.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
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 time_t expiry;
25 dns_address *rhs;
26 uschar *text;
27 int rc;
28 BOOL text_set;
29 } dnsbl_cache_block;
30
31
32 /* Anchor for DNSBL cache */
33
34 static tree_node *dnsbl_cache = NULL;
35
36
37 /* Bits for match_type in one_check_dnsbl() */
38
39 #define MT_NOT 1
40 #define MT_ALL 2
41
42 static uschar cutthrough_response(char, uschar **);
43
44
45 /*************************************************
46 * Retrieve a callout cache record *
47 *************************************************/
48
49 /* If a record exists, check whether it has expired.
50
51 Arguments:
52 dbm_file an open hints file
53 key the record key
54 type "address" or "domain"
55 positive_expire expire time for positive records
56 negative_expire expire time for negative records
57
58 Returns: the cache record if a non-expired one exists, else NULL
59 */
60
61 static dbdata_callout_cache *
62 get_callout_cache_record(open_db *dbm_file, const uschar *key, uschar *type,
63 int positive_expire, int negative_expire)
64 {
65 BOOL negative;
66 int length, expire;
67 time_t now;
68 dbdata_callout_cache *cache_record;
69
70 cache_record = dbfn_read_with_length(dbm_file, key, &length);
71
72 if (cache_record == NULL)
73 {
74 HDEBUG(D_verify) debug_printf("callout cache: no %s record found for %s\n", type, key);
75 return NULL;
76 }
77
78 /* We treat a record as "negative" if its result field is not positive, or if
79 it is a domain record and the postmaster field is negative. */
80
81 negative = cache_record->result != ccache_accept ||
82 (type[0] == 'd' && cache_record->postmaster_result == ccache_reject);
83 expire = negative? negative_expire : positive_expire;
84 now = time(NULL);
85
86 if (now - cache_record->time_stamp > expire)
87 {
88 HDEBUG(D_verify) debug_printf("callout cache: %s record expired for %s\n", type, key);
89 return NULL;
90 }
91
92 /* If this is a non-reject domain record, check for the obsolete format version
93 that doesn't have the postmaster and random timestamps, by looking at the
94 length. If so, copy it to a new-style block, replicating the record's
95 timestamp. Then check the additional timestamps. (There's no point wasting
96 effort if connections are rejected.) */
97
98 if (type[0] == 'd' && cache_record->result != ccache_reject)
99 {
100 if (length == sizeof(dbdata_callout_cache_obs))
101 {
102 dbdata_callout_cache *new = store_get(sizeof(dbdata_callout_cache));
103 memcpy(new, cache_record, length);
104 new->postmaster_stamp = new->random_stamp = new->time_stamp;
105 cache_record = new;
106 }
107
108 if (now - cache_record->postmaster_stamp > expire)
109 cache_record->postmaster_result = ccache_unknown;
110
111 if (now - cache_record->random_stamp > expire)
112 cache_record->random_result = ccache_unknown;
113 }
114
115 HDEBUG(D_verify) debug_printf("callout cache: found %s record for %s\n", type, key);
116 return cache_record;
117 }
118
119
120
121 /*************************************************
122 * Do callout verification for an address *
123 *************************************************/
124
125 /* This function is called from verify_address() when the address has routed to
126 a host list, and a callout has been requested. Callouts are expensive; that is
127 why a cache is used to improve the efficiency.
128
129 Arguments:
130 addr the address that's been routed
131 host_list the list of hosts to try
132 tf the transport feedback block
133
134 ifstring "interface" option from transport, or NULL
135 portstring "port" option from transport, or NULL
136 protocolstring "protocol" option from transport, or NULL
137 callout the per-command callout timeout
138 callout_overall the overall callout timeout (if < 0 use 4*callout)
139 callout_connect the callout connection timeout (if < 0 use callout)
140 options the verification options - these bits are used:
141 vopt_is_recipient => this is a recipient address
142 vopt_callout_no_cache => don't use callout cache
143 vopt_callout_fullpm => if postmaster check, do full one
144 vopt_callout_random => do the "random" thing
145 vopt_callout_recipsender => use real sender for recipient
146 vopt_callout_recippmaster => use postmaster for recipient
147 se_mailfrom MAIL FROM address for sender verify; NULL => ""
148 pm_mailfrom if non-NULL, do the postmaster check with this sender
149
150 Returns: OK/FAIL/DEFER
151 */
152
153 static int
154 do_callout(address_item *addr, host_item *host_list, transport_feedback *tf,
155 int callout, int callout_overall, int callout_connect, int options,
156 uschar *se_mailfrom, uschar *pm_mailfrom)
157 {
158 int yield = OK;
159 int old_domain_cache_result = ccache_accept;
160 BOOL done = FALSE;
161 uschar *address_key;
162 uschar *from_address;
163 uschar *random_local_part = NULL;
164 const uschar *save_deliver_domain = deliver_domain;
165 uschar **failure_ptr = options & vopt_is_recipient
166 ? &recipient_verify_failure : &sender_verify_failure;
167 open_db dbblock;
168 open_db *dbm_file = NULL;
169 dbdata_callout_cache new_domain_record;
170 dbdata_callout_cache_address new_address_record;
171 host_item *host;
172 time_t callout_start_time;
173 uschar peer_offered = 0;
174
175 new_domain_record.result = ccache_unknown;
176 new_domain_record.postmaster_result = ccache_unknown;
177 new_domain_record.random_result = ccache_unknown;
178
179 memset(&new_address_record, 0, sizeof(new_address_record));
180
181 /* For a recipient callout, the key used for the address cache record must
182 include the sender address if we are using the real sender in the callout,
183 because that may influence the result of the callout. */
184
185 address_key = addr->address;
186 from_address = US"";
187
188 if (options & vopt_is_recipient)
189 {
190 if (options & vopt_callout_recipsender)
191 {
192 address_key = string_sprintf("%s/<%s>", addr->address, sender_address);
193 from_address = sender_address;
194 if (cutthrough.delivery) options |= vopt_callout_no_cache;
195 }
196 else if (options & vopt_callout_recippmaster)
197 {
198 address_key = string_sprintf("%s/<postmaster@%s>", addr->address,
199 qualify_domain_sender);
200 from_address = string_sprintf("postmaster@%s", qualify_domain_sender);
201 }
202 }
203
204 /* For a sender callout, we must adjust the key if the mailfrom address is not
205 empty. */
206
207 else
208 {
209 from_address = (se_mailfrom == NULL)? US"" : se_mailfrom;
210 if (from_address[0] != 0)
211 address_key = string_sprintf("%s/<%s>", addr->address, from_address);
212 }
213
214 /* Open the callout cache database, it it exists, for reading only at this
215 stage, unless caching has been disabled. */
216
217 if (options & vopt_callout_no_cache)
218 {
219 HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n");
220 }
221 else if ((dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE)) == NULL)
222 {
223 HDEBUG(D_verify) debug_printf("callout cache: not available\n");
224 }
225
226 /* If a cache database is available see if we can avoid the need to do an
227 actual callout by making use of previously-obtained data. */
228
229 if (dbm_file != NULL)
230 {
231 dbdata_callout_cache_address *cache_address_record;
232 dbdata_callout_cache *cache_record = get_callout_cache_record(dbm_file,
233 addr->domain, US"domain",
234 callout_cache_domain_positive_expire,
235 callout_cache_domain_negative_expire);
236
237 /* If an unexpired cache record was found for this domain, see if the callout
238 process can be short-circuited. */
239
240 if (cache_record != NULL)
241 {
242 /* In most cases, if an early command (up to and including MAIL FROM:<>)
243 was rejected, there is no point carrying on. The callout fails. However, if
244 we are doing a recipient verification with use_sender or use_postmaster
245 set, a previous failure of MAIL FROM:<> doesn't count, because this time we
246 will be using a non-empty sender. We have to remember this situation so as
247 not to disturb the cached domain value if this whole verification succeeds
248 (we don't want it turning into "accept"). */
249
250 old_domain_cache_result = cache_record->result;
251
252 if (cache_record->result == ccache_reject ||
253 (*from_address == 0 && cache_record->result == ccache_reject_mfnull))
254 {
255 setflag(addr, af_verify_nsfail);
256 HDEBUG(D_verify)
257 debug_printf("callout cache: domain gave initial rejection, or "
258 "does not accept HELO or MAIL FROM:<>\n");
259 setflag(addr, af_verify_nsfail);
260 addr->user_message = US"(result of an earlier callout reused).";
261 yield = FAIL;
262 *failure_ptr = US"mail";
263 goto END_CALLOUT;
264 }
265
266 /* If a previous check on a "random" local part was accepted, we assume
267 that the server does not do any checking on local parts. There is therefore
268 no point in doing the callout, because it will always be successful. If a
269 random check previously failed, arrange not to do it again, but preserve
270 the data in the new record. If a random check is required but hasn't been
271 done, skip the remaining cache processing. */
272
273 if (options & vopt_callout_random) switch(cache_record->random_result)
274 {
275 case ccache_accept:
276 HDEBUG(D_verify)
277 debug_printf("callout cache: domain accepts random addresses\n");
278 goto END_CALLOUT; /* Default yield is OK */
279
280 case ccache_reject:
281 HDEBUG(D_verify)
282 debug_printf("callout cache: domain rejects random addresses\n");
283 options &= ~vopt_callout_random;
284 new_domain_record.random_result = ccache_reject;
285 new_domain_record.random_stamp = cache_record->random_stamp;
286 break;
287
288 default:
289 HDEBUG(D_verify)
290 debug_printf("callout cache: need to check random address handling "
291 "(not cached or cache expired)\n");
292 goto END_CACHE;
293 }
294
295 /* If a postmaster check is requested, but there was a previous failure,
296 there is again no point in carrying on. If a postmaster check is required,
297 but has not been done before, we are going to have to do a callout, so skip
298 remaining cache processing. */
299
300 if (pm_mailfrom != NULL)
301 {
302 if (cache_record->postmaster_result == ccache_reject)
303 {
304 setflag(addr, af_verify_pmfail);
305 HDEBUG(D_verify)
306 debug_printf("callout cache: domain does not accept "
307 "RCPT TO:<postmaster@domain>\n");
308 yield = FAIL;
309 *failure_ptr = US"postmaster";
310 setflag(addr, af_verify_pmfail);
311 addr->user_message = US"(result of earlier verification reused).";
312 goto END_CALLOUT;
313 }
314 if (cache_record->postmaster_result == ccache_unknown)
315 {
316 HDEBUG(D_verify)
317 debug_printf("callout cache: need to check RCPT "
318 "TO:<postmaster@domain> (not cached or cache expired)\n");
319 goto END_CACHE;
320 }
321
322 /* If cache says OK, set pm_mailfrom NULL to prevent a redundant
323 postmaster check if the address itself has to be checked. Also ensure
324 that the value in the cache record is preserved (with its old timestamp).
325 */
326
327 HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT "
328 "TO:<postmaster@domain>\n");
329 pm_mailfrom = NULL;
330 new_domain_record.postmaster_result = ccache_accept;
331 new_domain_record.postmaster_stamp = cache_record->postmaster_stamp;
332 }
333 }
334
335 /* We can't give a result based on information about the domain. See if there
336 is an unexpired cache record for this specific address (combined with the
337 sender address if we are doing a recipient callout with a non-empty sender).
338 */
339
340 cache_address_record = (dbdata_callout_cache_address *)
341 get_callout_cache_record(dbm_file,
342 address_key, US"address",
343 callout_cache_positive_expire,
344 callout_cache_negative_expire);
345
346 if (cache_address_record != NULL)
347 {
348 if (cache_address_record->result == ccache_accept)
349 {
350 HDEBUG(D_verify)
351 debug_printf("callout cache: address record is positive\n");
352 }
353 else
354 {
355 HDEBUG(D_verify)
356 debug_printf("callout cache: address record is negative\n");
357 addr->user_message = US"Previous (cached) callout verification failure";
358 *failure_ptr = US"recipient";
359 yield = FAIL;
360 }
361 goto END_CALLOUT;
362 }
363
364 /* Close the cache database while we actually do the callout for real. */
365
366 END_CACHE:
367 dbfn_close(dbm_file);
368 dbm_file = NULL;
369 }
370
371 if (!addr->transport)
372 {
373 HDEBUG(D_verify) debug_printf("cannot callout via null transport\n");
374 }
375 else if (Ustrcmp(addr->transport->driver_name, "smtp") != 0)
376 log_write(0, LOG_MAIN|LOG_PANIC|LOG_CONFIG_FOR, "callout transport '%s': %s is non-smtp",
377 addr->transport->name, addr->transport->driver_name);
378 else
379 {
380 smtp_transport_options_block *ob =
381 (smtp_transport_options_block *)addr->transport->options_block;
382
383 /* The information wasn't available in the cache, so we have to do a real
384 callout and save the result in the cache for next time, unless no_cache is set,
385 or unless we have a previously cached negative random result. If we are to test
386 with a random local part, ensure that such a local part is available. If not,
387 log the fact, but carry on without randomming. */
388
389 if (options & vopt_callout_random && callout_random_local_part != NULL)
390 if (!(random_local_part = expand_string(callout_random_local_part)))
391 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand "
392 "callout_random_local_part: %s", expand_string_message);
393
394 /* Default the connect and overall callout timeouts if not set, and record the
395 time we are starting so that we can enforce it. */
396
397 if (callout_overall < 0) callout_overall = 4 * callout;
398 if (callout_connect < 0) callout_connect = callout;
399 callout_start_time = time(NULL);
400
401 /* Before doing a real callout, if this is an SMTP connection, flush the SMTP
402 output because a callout might take some time. When PIPELINING is active and
403 there are many recipients, the total time for doing lots of callouts can add up
404 and cause the client to time out. So in this case we forgo the PIPELINING
405 optimization. */
406
407 if (smtp_out != NULL && !disable_callout_flush) mac_smtp_fflush();
408
409 /* cutthrough-multi: if a nonfirst rcpt has the same routing as the first,
410 and we are holding a cutthrough conn open, we can just append the rcpt to
411 that conn for verification purposes (and later delivery also). Simplest
412 coding means skipping this whole loop and doing the append separately.
413
414 We will need to remember it has been appended so that rcpt-acl tail code
415 can do it there for the non-rcpt-verify case. For this we keep an addresscount.
416 */
417
418 /* Can we re-use an open cutthrough connection? */
419 if ( cutthrough.fd >= 0
420 && (options & (vopt_callout_recipsender | vopt_callout_recippmaster))
421 == vopt_callout_recipsender
422 && !random_local_part
423 && !pm_mailfrom
424 )
425 {
426 if (addr->transport == cutthrough.addr.transport)
427 for (host = host_list; host; host = host->next)
428 if (Ustrcmp(host->address, cutthrough.host.address) == 0)
429 {
430 int host_af;
431 uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
432 int port = 25;
433
434 deliver_host = host->name;
435 deliver_host_address = host->address;
436 deliver_host_port = host->port;
437 deliver_domain = addr->domain;
438 transport_name = addr->transport->name;
439
440 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
441
442 if (!smtp_get_interface(tf->interface, host_af, addr, &interface,
443 US"callout") ||
444 !smtp_get_port(tf->port, addr, &port, US"callout"))
445 log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
446 addr->message);
447
448 if ( ( interface == cutthrough.interface
449 || ( interface
450 && cutthrough.interface
451 && Ustrcmp(interface, cutthrough.interface) == 0
452 ) )
453 && port == cutthrough.host.port
454 )
455 {
456 uschar * resp = NULL;
457
458 /* Match! Send the RCPT TO, append the addr, set done */
459 done =
460 smtp_write_command(&ctblock, FALSE, "RCPT TO:<%.1000s>\r\n",
461 transport_rcpt_address(addr,
462 (addr->transport == NULL)? FALSE :
463 addr->transport->rcpt_include_affixes)) >= 0 &&
464 cutthrough_response('2', &resp) == '2';
465
466 /* This would go horribly wrong if a callout fail was ignored by ACL.
467 We punt by abandoning cutthrough on a reject, like the
468 first-rcpt does. */
469
470 if (done)
471 {
472 address_item * na = store_get(sizeof(address_item));
473 *na = cutthrough.addr;
474 cutthrough.addr = *addr;
475 cutthrough.addr.host_used = &cutthrough.host;
476 cutthrough.addr.next = na;
477
478 cutthrough.nrcpt++;
479 }
480 else
481 {
482 cancel_cutthrough_connection("recipient rejected");
483 if (!resp || errno == ETIMEDOUT)
484 {
485 HDEBUG(D_verify) debug_printf("SMTP timeout\n");
486 }
487 else if (errno == 0)
488 {
489 if (*resp == 0)
490 Ustrcpy(resp, US"connection dropped");
491
492 addr->message =
493 string_sprintf("response to \"%s\" from %s [%s] was: %s",
494 big_buffer, host->name, host->address,
495 string_printing(resp));
496
497 addr->user_message =
498 string_sprintf("Callout verification failed:\n%s", resp);
499
500 /* Hard rejection ends the process */
501
502 if (resp[0] == '5') /* Address rejected */
503 {
504 yield = FAIL;
505 done = TRUE;
506 }
507 }
508 }
509 }
510 break;
511 }
512 if (!done)
513 cancel_cutthrough_connection("incompatible connection");
514 }
515
516 /* Now make connections to the hosts and do real callouts. The list of hosts
517 is passed in as an argument. */
518
519 for (host = host_list; host != NULL && !done; host = host->next)
520 {
521 smtp_inblock inblock;
522 smtp_outblock outblock;
523 int host_af;
524 int port = 25;
525 BOOL send_quit = TRUE;
526 uschar *active_hostname = smtp_active_hostname;
527 BOOL lmtp;
528 BOOL smtps;
529 BOOL esmtp;
530 BOOL suppress_tls = FALSE;
531 uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
532 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
533 BOOL dane = FALSE;
534 BOOL dane_required;
535 dns_answer tlsa_dnsa;
536 #endif
537 uschar inbuffer[4096];
538 uschar outbuffer[1024];
539 uschar responsebuffer[4096];
540 uschar * size_str;
541
542 clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
543 clearflag(addr, af_verify_nsfail); /* null sender callout flag */
544
545 /* Skip this host if we don't have an IP address for it. */
546
547 if (host->address == NULL)
548 {
549 DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
550 host->name);
551 continue;
552 }
553
554 /* Check the overall callout timeout */
555
556 if (time(NULL) - callout_start_time >= callout_overall)
557 {
558 HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
559 break;
560 }
561
562 /* Set IPv4 or IPv6 */
563
564 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
565
566 /* Expand and interpret the interface and port strings. The latter will not
567 be used if there is a host-specific port (e.g. from a manualroute router).
568 This has to be delayed till now, because they may expand differently for
569 different hosts. If there's a failure, log it, but carry on with the
570 defaults. */
571
572 deliver_host = host->name;
573 deliver_host_address = host->address;
574 deliver_host_port = host->port;
575 deliver_domain = addr->domain;
576 transport_name = addr->transport->name;
577
578 if ( !smtp_get_interface(tf->interface, host_af, addr, &interface,
579 US"callout")
580 || !smtp_get_port(tf->port, addr, &port, US"callout")
581 )
582 log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
583 addr->message);
584
585 /* Set HELO string according to the protocol */
586 lmtp= Ustrcmp(tf->protocol, "lmtp") == 0;
587 smtps= Ustrcmp(tf->protocol, "smtps") == 0;
588
589
590 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
591
592 /* Set up the buffer for reading SMTP response packets. */
593
594 inblock.buffer = inbuffer;
595 inblock.buffersize = sizeof(inbuffer);
596 inblock.ptr = inbuffer;
597 inblock.ptrend = inbuffer;
598
599 /* Set up the buffer for holding SMTP commands while pipelining */
600
601 outblock.buffer = outbuffer;
602 outblock.buffersize = sizeof(outbuffer);
603 outblock.ptr = outbuffer;
604 outblock.cmd_count = 0;
605 outblock.authenticating = FALSE;
606
607 /* Connect to the host; on failure, just loop for the next one, but we
608 set the error for the last one. Use the callout_connect timeout. */
609
610 tls_retry_connection:
611
612 /* Reset the parameters of a TLS session */
613 tls_out.cipher = tls_out.peerdn = tls_out.peercert = NULL;
614
615 inblock.sock = outblock.sock =
616 smtp_connect(host, host_af, port, interface, callout_connect,
617 addr->transport);
618 if (inblock.sock < 0)
619 {
620 addr->message = string_sprintf("could not connect to %s [%s]: %s",
621 host->name, host->address, strerror(errno));
622 transport_name = NULL;
623 deliver_host = deliver_host_address = NULL;
624 deliver_domain = save_deliver_domain;
625 continue;
626 }
627
628 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
629 {
630 int rc;
631
632 tls_out.dane_verified = FALSE;
633 tls_out.tlsa_usage = 0;
634
635 dane_required =
636 verify_check_given_host(&ob->hosts_require_dane, host) == OK;
637
638 if (host->dnssec == DS_YES)
639 {
640 if( dane_required
641 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
642 )
643 {
644 if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required)) != OK)
645 return rc;
646 dane = TRUE;
647 }
648 }
649 else if (dane_required)
650 {
651 log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
652 return FAIL;
653 }
654
655 if (dane)
656 ob->tls_tempfail_tryclear = FALSE;
657 }
658 #endif /*DANE*/
659
660 /* Expand the helo_data string to find the host name to use. */
661
662 if (tf->helo_data != NULL)
663 {
664 uschar *s = expand_string(tf->helo_data);
665 if (s == NULL)
666 log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: failed to expand transport's "
667 "helo_data value for callout: %s", addr->address,
668 expand_string_message);
669 else active_hostname = s;
670 }
671
672 /* Wait for initial response, and send HELO. The smtp_write_command()
673 function leaves its command in big_buffer. This is used in error responses.
674 Initialize it in case the connection is rejected. */
675
676 Ustrcpy(big_buffer, "initial connection");
677
678 /* Unless ssl-on-connect, wait for the initial greeting */
679 smtps_redo_greeting:
680
681 #ifdef SUPPORT_TLS
682 if (!smtps || (smtps && tls_out.active >= 0))
683 #endif
684 {
685 if (!(done= smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), '2', callout)))
686 goto RESPONSE_FAILED;
687
688 #ifndef DISABLE_EVENT
689 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
690 : host->dnssec==DS_NO ? US"no" : NULL;
691 if (event_raise(addr->transport->event_action,
692 US"smtp:connect", responsebuffer))
693 {
694 lookup_dnssec_authenticated = NULL;
695 /* Logging? Debug? */
696 goto RESPONSE_FAILED;
697 }
698 lookup_dnssec_authenticated = NULL;
699 #endif
700 }
701
702 /* Not worth checking greeting line for ESMTP support */
703 if (!(esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK))
704 DEBUG(D_transport)
705 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
706
707 tls_redo_helo:
708
709 #ifdef SUPPORT_TLS
710 if (smtps && tls_out.active < 0) /* ssl-on-connect, first pass */
711 {
712 peer_offered &= ~PEER_OFFERED_TLS;
713 ob->tls_tempfail_tryclear = FALSE;
714 }
715 else /* all other cases */
716 #endif
717
718 { esmtp_retry:
719
720 if (!(done= smtp_write_command(&outblock, FALSE, "%s %s\r\n",
721 !esmtp? "HELO" : lmtp? "LHLO" : "EHLO", active_hostname) >= 0))
722 goto SEND_FAILED;
723 if (!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), '2', callout))
724 {
725 if (errno != 0 || responsebuffer[0] == 0 || lmtp || !esmtp || tls_out.active >= 0)
726 {
727 done= FALSE;
728 goto RESPONSE_FAILED;
729 }
730 #ifdef SUPPORT_TLS
731 peer_offered &= ~PEER_OFFERED_TLS;
732 #endif
733 esmtp = FALSE;
734 goto esmtp_retry; /* fallback to HELO */
735 }
736
737 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
738
739 peer_offered = esmtp
740 ? ehlo_response(responsebuffer, sizeof(responsebuffer),
741 (!suppress_tls && tls_out.active < 0 ? PEER_OFFERED_TLS : 0)
742 | 0 /* no IGNQ */
743 | 0 /* no PRDR */
744 #ifdef SUPPORT_I18N
745 | (addr->prop.utf8_msg && !addr->prop.utf8_downcvt
746 ? PEER_OFFERED_UTF8 : 0)
747 #endif
748 | 0 /* no DSN */
749 | 0 /* no PIPE */
750
751 /* only care about SIZE if we have size from inbound */
752 | (message_size > 0 && ob->size_addition >= 0
753 ? PEER_OFFERED_SIZE : 0)
754 )
755 : 0;
756 }
757
758 size_str = peer_offered & PEER_OFFERED_SIZE
759 ? string_sprintf(" SIZE=%d", message_size + ob->size_addition) : US"";
760
761 #ifdef SUPPORT_TLS
762 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
763 #endif
764
765 /* If TLS is available on this connection attempt to
766 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
767 send another EHLO - the server may give a different answer in secure mode. We
768 use a separate buffer for reading the response to STARTTLS so that if it is
769 negative, the original EHLO data is available for subsequent analysis, should
770 the client not be required to use TLS. If the response is bad, copy the buffer
771 for error analysis. */
772
773 #ifdef SUPPORT_TLS
774 if ( peer_offered & PEER_OFFERED_TLS
775 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK
776 && verify_check_given_host(&ob->hosts_verify_avoid_tls, host) != OK
777 )
778 {
779 uschar buffer2[4096];
780 if ( !smtps
781 && !(done= smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") >= 0))
782 goto SEND_FAILED;
783
784 /* If there is an I/O error, transmission of this message is deferred. If
785 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
786 false, we also defer. However, if there is a temporary rejection of STARTTLS
787 and tls_tempfail_tryclear is true, or if there is an outright rejection of
788 STARTTLS, we carry on. This means we will try to send the message in clear,
789 unless the host is in hosts_require_tls (tested below). */
790
791 if (!smtps && !smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
792 ob->command_timeout))
793 {
794 if ( errno != 0
795 || buffer2[0] == 0
796 || buffer2[0] == '4' && !ob->tls_tempfail_tryclear
797 )
798 {
799 Ustrncpy(responsebuffer, buffer2, sizeof(responsebuffer));
800 done= FALSE;
801 goto RESPONSE_FAILED;
802 }
803 }
804
805 /* STARTTLS accepted or ssl-on-connect: try to negotiate a TLS session. */
806 else
807 {
808 int oldtimeout = ob->command_timeout;
809 int rc;
810
811 tls_negotiate:
812 ob->command_timeout = callout;
813 rc = tls_client_start(inblock.sock, host, addr, addr->transport
814 # ifdef EXPERIMENTAL_DANE
815 , dane ? &tlsa_dnsa : NULL
816 # endif
817 );
818 ob->command_timeout = oldtimeout;
819
820 /* TLS negotiation failed; give an error. Try in clear on a new
821 connection, if the options permit it for this host. */
822 if (rc != OK)
823 {
824 if (rc == DEFER)
825 {
826 (void)close(inblock.sock);
827 # ifndef DISABLE_EVENT
828 (void) event_raise(addr->transport->event_action,
829 US"tcp:close", NULL);
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 peer_offered & PEER_OFFERED_TLS
878 ? "an attempt to start TLS failed"
879 : "the server did not offer TLS support");
880 done= FALSE;
881 goto TLS_FAILED;
882 }
883
884 #endif /*SUPPORT_TLS*/
885
886 done = TRUE; /* so far so good; have response to HELO */
887
888 /* For now, transport_filter by cutthrough-delivery is not supported */
889 /* Need proper integration with the proper transport mechanism. */
890 if (cutthrough.delivery)
891 {
892 #ifndef DISABLE_DKIM
893 uschar * s;
894 #endif
895 if (addr->transport->filter_command)
896 {
897 cutthrough.delivery = FALSE;
898 HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of transport filter\n");
899 }
900 #ifndef DISABLE_DKIM
901 else if ((s = ob->dkim.dkim_domain) && (s = expand_string(s)) && *s)
902 {
903 cutthrough.delivery = FALSE;
904 HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of DKIM signing\n");
905 }
906 #endif
907 }
908
909 SEND_FAILED:
910 RESPONSE_FAILED:
911 TLS_FAILED:
912 ;
913 /* Clear down of the TLS, SMTP and TCP layers on error is handled below. */
914
915 /* Failure to accept HELO is cached; this blocks the whole domain for all
916 senders. I/O errors and defer responses are not cached. */
917
918 if (!done)
919 {
920 *failure_ptr = US"mail"; /* At or before MAIL */
921 if (errno == 0 && responsebuffer[0] == '5')
922 {
923 setflag(addr, af_verify_nsfail);
924 new_domain_record.result = ccache_reject;
925 }
926 }
927
928 #ifdef SUPPORT_I18N
929 else if ( addr->prop.utf8_msg
930 && !addr->prop.utf8_downcvt
931 && !(peer_offered & PEER_OFFERED_UTF8)
932 )
933 {
934 HDEBUG(D_acl|D_v) debug_printf("utf8 required but not offered\n");
935 errno = ERRNO_UTF8_FWD;
936 setflag(addr, af_verify_nsfail);
937 done = FALSE;
938 }
939 else if ( addr->prop.utf8_msg
940 && (addr->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
941 && (setflag(addr, af_utf8_downcvt),
942 from_address = string_address_utf8_to_alabel(from_address,
943 &addr->message),
944 addr->message
945 ) )
946 {
947 errno = ERRNO_EXPANDFAIL;
948 setflag(addr, af_verify_nsfail);
949 done = FALSE;
950 }
951 #endif
952
953 /* If we haven't authenticated, but are required to, give up. */
954 /* Try to AUTH */
955
956 else done = smtp_auth(responsebuffer, sizeof(responsebuffer),
957 addr, host, ob, esmtp, &inblock, &outblock) == OK &&
958
959 /* Copy AUTH info for logging */
960 ( (addr->authenticator = client_authenticator),
961 (addr->auth_id = client_authenticated_id),
962
963 /* Build a mail-AUTH string (re-using responsebuffer for convenience */
964 !smtp_mail_auth_str(responsebuffer, sizeof(responsebuffer), addr, ob)
965 ) &&
966
967 ( (addr->auth_sndr = client_authenticated_sender),
968
969 /* Send the MAIL command */
970 (smtp_write_command(&outblock, FALSE,
971 #ifdef SUPPORT_I18N
972 addr->prop.utf8_msg && !addr->prop.utf8_downcvt
973 ? "MAIL FROM:<%s>%s%s SMTPUTF8\r\n"
974 :
975 #endif
976 "MAIL FROM:<%s>%s%s\r\n",
977 from_address, responsebuffer, size_str) >= 0)
978 ) &&
979
980 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
981 '2', callout);
982
983 deliver_host = deliver_host_address = NULL;
984 deliver_domain = save_deliver_domain;
985
986 /* If the host does not accept MAIL FROM:<>, arrange to cache this
987 information, but again, don't record anything for an I/O error or a defer. Do
988 not cache rejections of MAIL when a non-empty sender has been used, because
989 that blocks the whole domain for all senders. */
990
991 if (!done)
992 {
993 *failure_ptr = US"mail"; /* At or before MAIL */
994 if (errno == 0 && responsebuffer[0] == '5')
995 {
996 setflag(addr, af_verify_nsfail);
997 if (from_address[0] == 0)
998 new_domain_record.result = ccache_reject_mfnull;
999 }
1000 }
1001
1002 /* Otherwise, proceed to check a "random" address (if required), then the
1003 given address, and the postmaster address (if required). Between each check,
1004 issue RSET, because some servers accept only one recipient after MAIL
1005 FROM:<>.
1006
1007 Before doing this, set the result in the domain cache record to "accept",
1008 unless its previous value was ccache_reject_mfnull. In that case, the domain
1009 rejects MAIL FROM:<> and we want to continue to remember that. When that is
1010 the case, we have got here only in the case of a recipient verification with
1011 a non-null sender. */
1012
1013 else
1014 {
1015 const uschar * rcpt_domain = addr->domain;
1016
1017 #ifdef SUPPORT_I18N
1018 uschar * errstr = NULL;
1019 if ( testflag(addr, af_utf8_downcvt)
1020 && (rcpt_domain = string_domain_utf8_to_alabel(rcpt_domain,
1021 &errstr), errstr)
1022 )
1023 {
1024 addr->message = errstr;
1025 errno = ERRNO_EXPANDFAIL;
1026 setflag(addr, af_verify_nsfail);
1027 done = FALSE;
1028 rcpt_domain = US""; /*XXX errorhandling! */
1029 }
1030 #endif
1031
1032 new_domain_record.result =
1033 (old_domain_cache_result == ccache_reject_mfnull)?
1034 ccache_reject_mfnull: ccache_accept;
1035
1036 /* Do the random local part check first */
1037
1038 if (random_local_part != NULL)
1039 {
1040 uschar randombuffer[1024];
1041 BOOL random_ok =
1042 smtp_write_command(&outblock, FALSE,
1043 "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part,
1044 rcpt_domain) >= 0 &&
1045 smtp_read_response(&inblock, randombuffer,
1046 sizeof(randombuffer), '2', callout);
1047
1048 /* Remember when we last did a random test */
1049
1050 new_domain_record.random_stamp = time(NULL);
1051
1052 /* If accepted, we aren't going to do any further tests below. */
1053
1054 if (random_ok)
1055 new_domain_record.random_result = ccache_accept;
1056
1057 /* Otherwise, cache a real negative response, and get back to the right
1058 state to send RCPT. Unless there's some problem such as a dropped
1059 connection, we expect to succeed, because the commands succeeded above.
1060 However, some servers drop the connection after responding to an
1061 invalid recipient, so on (any) error we drop and remake the connection.
1062 */
1063
1064 else if (errno == 0)
1065 {
1066 /* This would be ok for 1st rcpt a cutthrough, but no way to
1067 handle a subsequent. So refuse to support any */
1068 cancel_cutthrough_connection("random-recipient");
1069
1070 if (randombuffer[0] == '5')
1071 new_domain_record.random_result = ccache_reject;
1072
1073 done =
1074 smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
1075 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
1076 '2', callout) &&
1077
1078 smtp_write_command(&outblock, FALSE,
1079 #ifdef SUPPORT_I18N
1080 addr->prop.utf8_msg && !addr->prop.utf8_downcvt
1081 ? "MAIL FROM:<%s> SMTPUTF8\r\n"
1082 :
1083 #endif
1084 "MAIL FROM:<%s>\r\n",
1085 from_address) >= 0 &&
1086 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
1087 '2', callout);
1088
1089 if (!done)
1090 {
1091 HDEBUG(D_acl|D_v)
1092 debug_printf("problem after random/rset/mfrom; reopen conn\n");
1093 random_local_part = NULL;
1094 #ifdef SUPPORT_TLS
1095 tls_close(FALSE, TRUE);
1096 #endif
1097 (void)close(inblock.sock);
1098 #ifndef DISABLE_EVENT
1099 (void) event_raise(addr->transport->event_action,
1100 US"tcp:close", NULL);
1101 #endif
1102 goto tls_retry_connection;
1103 }
1104 }
1105 else done = FALSE; /* Some timeout/connection problem */
1106 } /* Random check */
1107
1108 /* If the host is accepting all local parts, as determined by the "random"
1109 check, we don't need to waste time doing any further checking. */
1110
1111 if (new_domain_record.random_result != ccache_accept && done)
1112 {
1113 /* Get the rcpt_include_affixes flag from the transport if there is one,
1114 but assume FALSE if there is not. */
1115
1116 uschar * rcpt = transport_rcpt_address(addr,
1117 addr->transport ? addr->transport->rcpt_include_affixes : FALSE);
1118
1119 #ifdef SUPPORT_I18N
1120 /*XXX should the conversion be moved into transport_rcpt_address() ? */
1121 uschar * dummy_errstr = NULL;
1122 if ( testflag(addr, af_utf8_downcvt)
1123 && (rcpt = string_address_utf8_to_alabel(rcpt, &dummy_errstr),
1124 dummy_errstr
1125 ) )
1126 {
1127 errno = ERRNO_EXPANDFAIL;
1128 *failure_ptr = US"recipient";
1129 done = FALSE;
1130 }
1131 else
1132 #endif
1133
1134 done =
1135 smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
1136 rcpt) >= 0 &&
1137 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
1138 '2', callout);
1139
1140 if (done)
1141 new_address_record.result = ccache_accept;
1142 else if (errno == 0 && responsebuffer[0] == '5')
1143 {
1144 *failure_ptr = US"recipient";
1145 new_address_record.result = ccache_reject;
1146 }
1147
1148 /* Do postmaster check if requested; if a full check is required, we
1149 check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
1150
1151 if (done && pm_mailfrom != NULL)
1152 {
1153 /* Could possibly shift before main verify, just above, and be ok
1154 for cutthrough. But no way to handle a subsequent rcpt, so just
1155 refuse any */
1156 cancel_cutthrough_connection("postmaster verify");
1157 HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of postmaster verify\n");
1158
1159 done =
1160 smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
1161 smtp_read_response(&inblock, responsebuffer,
1162 sizeof(responsebuffer), '2', callout) &&
1163
1164 smtp_write_command(&outblock, FALSE,
1165 "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 &&
1166 smtp_read_response(&inblock, responsebuffer,
1167 sizeof(responsebuffer), '2', callout) &&
1168
1169 /* First try using the current domain */
1170
1171 ((
1172 smtp_write_command(&outblock, FALSE,
1173 "RCPT TO:<postmaster@%.1000s>\r\n", rcpt_domain) >= 0 &&
1174 smtp_read_response(&inblock, responsebuffer,
1175 sizeof(responsebuffer), '2', callout)
1176 )
1177
1178 ||
1179
1180 /* If that doesn't work, and a full check is requested,
1181 try without the domain. */
1182
1183 (
1184 (options & vopt_callout_fullpm) != 0 &&
1185 smtp_write_command(&outblock, FALSE,
1186 "RCPT TO:<postmaster>\r\n") >= 0 &&
1187 smtp_read_response(&inblock, responsebuffer,
1188 sizeof(responsebuffer), '2', callout)
1189 ));
1190
1191 /* Sort out the cache record */
1192
1193 new_domain_record.postmaster_stamp = time(NULL);
1194
1195 if (done)
1196 new_domain_record.postmaster_result = ccache_accept;
1197 else if (errno == 0 && responsebuffer[0] == '5')
1198 {
1199 *failure_ptr = US"postmaster";
1200 setflag(addr, af_verify_pmfail);
1201 new_domain_record.postmaster_result = ccache_reject;
1202 }
1203 }
1204 } /* Random not accepted */
1205 } /* MAIL FROM: accepted */
1206
1207 /* For any failure of the main check, other than a negative response, we just
1208 close the connection and carry on. We can identify a negative response by the
1209 fact that errno is zero. For I/O errors it will be non-zero
1210
1211 Set up different error texts for logging and for sending back to the caller
1212 as an SMTP response. Log in all cases, using a one-line format. For sender
1213 callouts, give a full response to the caller, but for recipient callouts,
1214 don't give the IP address because this may be an internal host whose identity
1215 is not to be widely broadcast. */
1216
1217 if (!done)
1218 {
1219 if (errno == ETIMEDOUT)
1220 {
1221 HDEBUG(D_verify) debug_printf("SMTP timeout\n");
1222 send_quit = FALSE;
1223 }
1224 #ifdef SUPPORT_I18N
1225 else if (errno == ERRNO_UTF8_FWD)
1226 {
1227 extern int acl_where; /* src/acl.c */
1228 errno = 0;
1229 addr->message = string_sprintf(
1230 "response to \"%s\" from %s [%s] did not include SMTPUTF8",
1231 big_buffer, host->name, host->address);
1232 addr->user_message = acl_where == ACL_WHERE_RCPT
1233 ? US"533 mailbox name not allowed"
1234 : US"550 mailbox unavailable";
1235 yield = FAIL;
1236 done = TRUE;
1237 }
1238 #endif
1239 else if (errno == 0)
1240 {
1241 if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped");
1242
1243 addr->message =
1244 string_sprintf("response to \"%s\" from %s [%s] was: %s",
1245 big_buffer, host->name, host->address,
1246 string_printing(responsebuffer));
1247
1248 addr->user_message = options & vopt_is_recipient
1249 ? string_sprintf("Callout verification failed:\n%s", responsebuffer)
1250 : string_sprintf("Called: %s\nSent: %s\nResponse: %s",
1251 host->address, big_buffer, responsebuffer);
1252
1253 /* Hard rejection ends the process */
1254
1255 if (responsebuffer[0] == '5') /* Address rejected */
1256 {
1257 yield = FAIL;
1258 done = TRUE;
1259 }
1260 }
1261 }
1262
1263 /* End the SMTP conversation and close the connection. */
1264
1265 /* Cutthrough - on a successfull connect and recipient-verify with
1266 use-sender and we are 1st rcpt and have no cutthrough conn so far
1267 here is where we want to leave the conn open */
1268 if ( cutthrough.delivery
1269 && rcpt_count == 1
1270 && done
1271 && yield == OK
1272 && (options & (vopt_callout_recipsender|vopt_callout_recippmaster|vopt_success_on_redirect))
1273 == vopt_callout_recipsender
1274 && !random_local_part
1275 && !pm_mailfrom
1276 && cutthrough.fd < 0
1277 && !lmtp
1278 )
1279 {
1280 HDEBUG(D_acl|D_v) debug_printf("holding verify callout open for cutthrough delivery\n");
1281
1282 cutthrough.fd = outblock.sock; /* We assume no buffer in use in the outblock */
1283 cutthrough.nrcpt = 1;
1284 cutthrough.interface = interface;
1285 cutthrough.host = *host;
1286 cutthrough.addr = *addr; /* Save the address_item for later logging */
1287 cutthrough.addr.next = NULL;
1288 cutthrough.addr.host_used = &cutthrough.host;
1289 if (addr->parent)
1290 *(cutthrough.addr.parent = store_get(sizeof(address_item))) =
1291 *addr->parent;
1292 ctblock.buffer = ctbuffer;
1293 ctblock.buffersize = sizeof(ctbuffer);
1294 ctblock.ptr = ctbuffer;
1295 /* ctblock.cmd_count = 0; ctblock.authenticating = FALSE; */
1296 ctblock.sock = cutthrough.fd;
1297 }
1298 else
1299 {
1300 /* Ensure no cutthrough on multiple address verifies */
1301 if (options & vopt_callout_recipsender)
1302 cancel_cutthrough_connection("multiple verify calls");
1303 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
1304
1305 #ifdef SUPPORT_TLS
1306 tls_close(FALSE, TRUE);
1307 #endif
1308 (void)close(inblock.sock);
1309 #ifndef DISABLE_EVENT
1310 (void) event_raise(addr->transport->event_action, US"tcp:close", NULL);
1311 #endif
1312 }
1313
1314 } /* Loop through all hosts, while !done */
1315 }
1316
1317 /* If we get here with done == TRUE, a successful callout happened, and yield
1318 will be set OK or FAIL according to the response to the RCPT command.
1319 Otherwise, we looped through the hosts but couldn't complete the business.
1320 However, there may be domain-specific information to cache in both cases.
1321
1322 The value of the result field in the new_domain record is ccache_unknown if
1323 there was an error before or with MAIL FROM:, and errno was not zero,
1324 implying some kind of I/O error. We don't want to write the cache in that case.
1325 Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
1326
1327 if ( !(options & vopt_callout_no_cache)
1328 && new_domain_record.result != ccache_unknown)
1329 {
1330 if ((dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE))
1331 == NULL)
1332 {
1333 HDEBUG(D_verify) debug_printf("callout cache: not available\n");
1334 }
1335 else
1336 {
1337 (void)dbfn_write(dbm_file, addr->domain, &new_domain_record,
1338 (int)sizeof(dbdata_callout_cache));
1339 HDEBUG(D_verify) debug_printf("wrote callout cache domain record for %s:\n"
1340 " result=%d postmaster=%d random=%d\n",
1341 addr->domain,
1342 new_domain_record.result,
1343 new_domain_record.postmaster_result,
1344 new_domain_record.random_result);
1345 }
1346 }
1347
1348 /* If a definite result was obtained for the callout, cache it unless caching
1349 is disabled. */
1350
1351 if (done)
1352 {
1353 if ( !(options & vopt_callout_no_cache)
1354 && new_address_record.result != ccache_unknown)
1355 {
1356 if (dbm_file == NULL)
1357 dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE);
1358 if (dbm_file == NULL)
1359 {
1360 HDEBUG(D_verify) debug_printf("no callout cache available\n");
1361 }
1362 else
1363 {
1364 (void)dbfn_write(dbm_file, address_key, &new_address_record,
1365 (int)sizeof(dbdata_callout_cache_address));
1366 HDEBUG(D_verify) debug_printf("wrote %s callout cache address record for %s\n",
1367 new_address_record.result == ccache_accept ? "positive" : "negative",
1368 address_key);
1369 }
1370 }
1371 } /* done */
1372
1373 /* Failure to connect to any host, or any response other than 2xx or 5xx is a
1374 temporary error. If there was only one host, and a response was received, leave
1375 it alone if supplying details. Otherwise, give a generic response. */
1376
1377 else /* !done */
1378 {
1379 uschar *dullmsg = string_sprintf("Could not complete %s verify callout",
1380 options & vopt_is_recipient ? "recipient" : "sender");
1381 yield = DEFER;
1382
1383 if (host_list->next != NULL || addr->message == NULL) addr->message = dullmsg;
1384
1385 addr->user_message = (!smtp_return_error_details)? dullmsg :
1386 string_sprintf("%s for <%s>.\n"
1387 "The mail server(s) for the domain may be temporarily unreachable, or\n"
1388 "they may be permanently unreachable from this server. In the latter case,\n%s",
1389 dullmsg, addr->address,
1390 options & vopt_is_recipient
1391 ? "the address will never be accepted."
1392 : "you need to change the address or create an MX record for its domain\n"
1393 "if it is supposed to be generally accessible from the Internet.\n"
1394 "Talk to your mail administrator for details.");
1395
1396 /* Force a specific error code */
1397
1398 addr->basic_errno = ERRNO_CALLOUTDEFER;
1399 }
1400
1401 /* Come here from within the cache-reading code on fast-track exit. */
1402
1403 END_CALLOUT:
1404 if (dbm_file != NULL) dbfn_close(dbm_file);
1405 return yield;
1406 }
1407
1408
1409
1410 /* Called after recipient-acl to get a cutthrough connection open when
1411 one was requested and a recipient-verify wasn't subsequently done.
1412 */
1413 int
1414 open_cutthrough_connection( address_item * addr )
1415 {
1416 address_item addr2;
1417 int rc;
1418
1419 /* Use a recipient-verify-callout to set up the cutthrough connection. */
1420 /* We must use a copy of the address for verification, because it might
1421 get rewritten. */
1422
1423 addr2 = *addr;
1424 HDEBUG(D_acl) debug_printf("----------- %s cutthrough setup ------------\n",
1425 rcpt_count > 1 ? "more" : "start");
1426 rc= verify_address(&addr2, NULL,
1427 vopt_is_recipient | vopt_callout_recipsender | vopt_callout_no_cache,
1428 CUTTHROUGH_CMD_TIMEOUT, -1, -1,
1429 NULL, NULL, NULL);
1430 HDEBUG(D_acl) debug_printf("----------- end cutthrough setup ------------\n");
1431 return rc;
1432 }
1433
1434
1435
1436 /* Send given number of bytes from the buffer */
1437 static BOOL
1438 cutthrough_send(int n)
1439 {
1440 if(cutthrough.fd < 0)
1441 return TRUE;
1442
1443 if(
1444 #ifdef SUPPORT_TLS
1445 (tls_out.active == cutthrough.fd) ? tls_write(FALSE, ctblock.buffer, n) :
1446 #endif
1447 send(cutthrough.fd, ctblock.buffer, n, 0) > 0
1448 )
1449 {
1450 transport_count += n;
1451 ctblock.ptr= ctblock.buffer;
1452 return TRUE;
1453 }
1454
1455 HDEBUG(D_transport|D_acl) debug_printf("cutthrough_send failed: %s\n", strerror(errno));
1456 return FALSE;
1457 }
1458
1459
1460
1461 static BOOL
1462 _cutthrough_puts(uschar * cp, int n)
1463 {
1464 while(n--)
1465 {
1466 if(ctblock.ptr >= ctblock.buffer+ctblock.buffersize)
1467 if(!cutthrough_send(ctblock.buffersize))
1468 return FALSE;
1469
1470 *ctblock.ptr++ = *cp++;
1471 }
1472 return TRUE;
1473 }
1474
1475 /* Buffered output of counted data block. Return boolean success */
1476 BOOL
1477 cutthrough_puts(uschar * cp, int n)
1478 {
1479 if (cutthrough.fd < 0) return TRUE;
1480 if (_cutthrough_puts(cp, n)) return TRUE;
1481 cancel_cutthrough_connection("transmit failed");
1482 return FALSE;
1483 }
1484
1485
1486 static BOOL
1487 _cutthrough_flush_send(void)
1488 {
1489 int n= ctblock.ptr-ctblock.buffer;
1490
1491 if(n>0)
1492 if(!cutthrough_send(n))
1493 return FALSE;
1494 return TRUE;
1495 }
1496
1497
1498 /* Send out any bufferred output. Return boolean success. */
1499 BOOL
1500 cutthrough_flush_send(void)
1501 {
1502 if (_cutthrough_flush_send()) return TRUE;
1503 cancel_cutthrough_connection("transmit failed");
1504 return FALSE;
1505 }
1506
1507
1508 BOOL
1509 cutthrough_put_nl(void)
1510 {
1511 return cutthrough_puts(US"\r\n", 2);
1512 }
1513
1514
1515 /* Get and check response from cutthrough target */
1516 static uschar
1517 cutthrough_response(char expect, uschar ** copy)
1518 {
1519 smtp_inblock inblock;
1520 uschar inbuffer[4096];
1521 uschar responsebuffer[4096];
1522
1523 inblock.buffer = inbuffer;
1524 inblock.buffersize = sizeof(inbuffer);
1525 inblock.ptr = inbuffer;
1526 inblock.ptrend = inbuffer;
1527 inblock.sock = cutthrough.fd;
1528 /* this relies on (inblock.sock == tls_out.active) */
1529 if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, CUTTHROUGH_DATA_TIMEOUT))
1530 cancel_cutthrough_connection("target timeout on read");
1531
1532 if(copy != NULL)
1533 {
1534 uschar * cp;
1535 *copy = cp = string_copy(responsebuffer);
1536 /* Trim the trailing end of line */
1537 cp += Ustrlen(responsebuffer);
1538 if(cp > *copy && cp[-1] == '\n') *--cp = '\0';
1539 if(cp > *copy && cp[-1] == '\r') *--cp = '\0';
1540 }
1541
1542 return responsebuffer[0];
1543 }
1544
1545
1546 /* Negotiate dataphase with the cutthrough target, returning success boolean */
1547 BOOL
1548 cutthrough_predata(void)
1549 {
1550 if(cutthrough.fd < 0)
1551 return FALSE;
1552
1553 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> DATA\n");
1554 cutthrough_puts(US"DATA\r\n", 6);
1555 cutthrough_flush_send();
1556
1557 /* Assume nothing buffered. If it was it gets ignored. */
1558 return cutthrough_response('3', NULL) == '3';
1559 }
1560
1561
1562 /* fd and use_crlf args only to match write_chunk() */
1563 static BOOL
1564 cutthrough_write_chunk(int fd, uschar * s, int len, BOOL use_crlf)
1565 {
1566 uschar * s2;
1567 while(s && (s2 = Ustrchr(s, '\n')))
1568 {
1569 if(!cutthrough_puts(s, s2-s) || !cutthrough_put_nl())
1570 return FALSE;
1571 s = s2+1;
1572 }
1573 return TRUE;
1574 }
1575
1576
1577 /* Buffered send of headers. Return success boolean. */
1578 /* Expands newlines to wire format (CR,NL). */
1579 /* Also sends header-terminating blank line. */
1580 BOOL
1581 cutthrough_headers_send(void)
1582 {
1583 if(cutthrough.fd < 0)
1584 return FALSE;
1585
1586 /* We share a routine with the mainline transport to handle header add/remove/rewrites,
1587 but having a separate buffered-output function (for now)
1588 */
1589 HDEBUG(D_acl) debug_printf("----------- start cutthrough headers send -----------\n");
1590
1591 if (!transport_headers_send(&cutthrough.addr, cutthrough.fd,
1592 cutthrough.addr.transport->add_headers,
1593 cutthrough.addr.transport->remove_headers,
1594 &cutthrough_write_chunk, TRUE,
1595 cutthrough.addr.transport->rewrite_rules,
1596 cutthrough.addr.transport->rewrite_existflags))
1597 return FALSE;
1598
1599 HDEBUG(D_acl) debug_printf("----------- done cutthrough headers send ------------\n");
1600 return TRUE;
1601 }
1602
1603
1604 static void
1605 close_cutthrough_connection(const char * why)
1606 {
1607 if(cutthrough.fd >= 0)
1608 {
1609 /* We could be sending this after a bunch of data, but that is ok as
1610 the only way to cancel the transfer in dataphase is to drop the tcp
1611 conn before the final dot.
1612 */
1613 ctblock.ptr = ctbuffer;
1614 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> QUIT\n");
1615 _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */
1616 _cutthrough_flush_send();
1617 /* No wait for response */
1618
1619 #ifdef SUPPORT_TLS
1620 tls_close(FALSE, TRUE);
1621 #endif
1622 (void)close(cutthrough.fd);
1623 cutthrough.fd = -1;
1624 HDEBUG(D_acl) debug_printf("----------- cutthrough shutdown (%s) ------------\n", why);
1625 }
1626 ctblock.ptr = ctbuffer;
1627 }
1628
1629 void
1630 cancel_cutthrough_connection(const char * why)
1631 {
1632 close_cutthrough_connection(why);
1633 cutthrough.delivery = FALSE;
1634 }
1635
1636
1637
1638
1639 /* Have senders final-dot. Send one to cutthrough target, and grab the response.
1640 Log an OK response as a transmission.
1641 Close the connection.
1642 Return smtp response-class digit.
1643 */
1644 uschar *
1645 cutthrough_finaldot(void)
1646 {
1647 uschar res;
1648 address_item * addr;
1649 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> .\n");
1650
1651 /* Assume data finshed with new-line */
1652 if( !cutthrough_puts(US".", 1)
1653 || !cutthrough_put_nl()
1654 || !cutthrough_flush_send()
1655 )
1656 return cutthrough.addr.message;
1657
1658 res = cutthrough_response('2', &cutthrough.addr.message);
1659 for (addr = &cutthrough.addr; addr; addr = addr->next)
1660 {
1661 addr->message = cutthrough.addr.message;
1662 switch(res)
1663 {
1664 case '2':
1665 delivery_log(LOG_MAIN, addr, (int)'>', NULL);
1666 close_cutthrough_connection("delivered");
1667 break;
1668
1669 case '4':
1670 delivery_log(LOG_MAIN, addr, 0,
1671 US"tmp-reject from cutthrough after DATA:");
1672 break;
1673
1674 case '5':
1675 delivery_log(LOG_MAIN|LOG_REJECT, addr, 0,
1676 US"rejected after DATA:");
1677 break;
1678
1679 default:
1680 break;
1681 }
1682 }
1683 return cutthrough.addr.message;
1684 }
1685
1686
1687
1688 /*************************************************
1689 * Copy error to toplevel address *
1690 *************************************************/
1691
1692 /* This function is used when a verify fails or defers, to ensure that the
1693 failure or defer information is in the original toplevel address. This applies
1694 when an address is redirected to a single new address, and the failure or
1695 deferral happens to the child address.
1696
1697 Arguments:
1698 vaddr the verify address item
1699 addr the final address item
1700 yield FAIL or DEFER
1701
1702 Returns: the value of YIELD
1703 */
1704
1705 static int
1706 copy_error(address_item *vaddr, address_item *addr, int yield)
1707 {
1708 if (addr != vaddr)
1709 {
1710 vaddr->message = addr->message;
1711 vaddr->user_message = addr->user_message;
1712 vaddr->basic_errno = addr->basic_errno;
1713 vaddr->more_errno = addr->more_errno;
1714 vaddr->prop.address_data = addr->prop.address_data;
1715 copyflag(vaddr, addr, af_pass_message);
1716 }
1717 return yield;
1718 }
1719
1720
1721
1722
1723 /**************************************************
1724 * printf that automatically handles TLS if needed *
1725 ***************************************************/
1726
1727 /* This function is used by verify_address() as a substitute for all fprintf()
1728 calls; a direct fprintf() will not produce output in a TLS SMTP session, such
1729 as a response to an EXPN command. smtp_in.c makes smtp_printf available but
1730 that assumes that we always use the smtp_out FILE* when not using TLS or the
1731 ssl buffer when we are. Instead we take a FILE* parameter and check to see if
1732 that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular
1733 fprintf().
1734
1735 Arguments:
1736 f the candidate FILE* to write to
1737 format format string
1738 ... optional arguments
1739
1740 Returns:
1741 nothing
1742 */
1743
1744 static void PRINTF_FUNCTION(2,3)
1745 respond_printf(FILE *f, const char *format, ...)
1746 {
1747 va_list ap;
1748
1749 va_start(ap, format);
1750 if (smtp_out && (f == smtp_out))
1751 smtp_vprintf(format, ap);
1752 else
1753 vfprintf(f, format, ap);
1754 va_end(ap);
1755 }
1756
1757
1758
1759 /*************************************************
1760 * Verify an email address *
1761 *************************************************/
1762
1763 /* This function is used both for verification (-bv and at other times) and
1764 address testing (-bt), which is indicated by address_test_mode being set.
1765
1766 Arguments:
1767 vaddr contains the address to verify; the next field in this block
1768 must be NULL
1769 f if not NULL, write the result to this file
1770 options various option bits:
1771 vopt_fake_sender => this sender verify is not for the real
1772 sender (it was verify=sender=xxxx or an address from a
1773 header line) - rewriting must not change sender_address
1774 vopt_is_recipient => this is a recipient address, otherwise
1775 it's a sender address - this affects qualification and
1776 rewriting and messages from callouts
1777 vopt_qualify => qualify an unqualified address; else error
1778 vopt_expn => called from SMTP EXPN command
1779 vopt_success_on_redirect => when a new address is generated
1780 the verification instantly succeeds
1781
1782 These ones are used by do_callout() -- the options variable
1783 is passed to it.
1784
1785 vopt_callout_fullpm => if postmaster check, do full one
1786 vopt_callout_no_cache => don't use callout cache
1787 vopt_callout_random => do the "random" thing
1788 vopt_callout_recipsender => use real sender for recipient
1789 vopt_callout_recippmaster => use postmaster for recipient
1790
1791 callout if > 0, specifies that callout is required, and gives timeout
1792 for individual commands
1793 callout_overall if > 0, gives overall timeout for the callout function;
1794 if < 0, a default is used (see do_callout())
1795 callout_connect the connection timeout for callouts
1796 se_mailfrom when callout is requested to verify a sender, use this
1797 in MAIL FROM; NULL => ""
1798 pm_mailfrom when callout is requested, if non-NULL, do the postmaster
1799 thing and use this as the sender address (may be "")
1800
1801 routed if not NULL, set TRUE if routing succeeded, so we can
1802 distinguish between routing failed and callout failed
1803
1804 Returns: OK address verified
1805 FAIL address failed to verify
1806 DEFER can't tell at present
1807 */
1808
1809 int
1810 verify_address(address_item *vaddr, FILE *f, int options, int callout,
1811 int callout_overall, int callout_connect, uschar *se_mailfrom,
1812 uschar *pm_mailfrom, BOOL *routed)
1813 {
1814 BOOL allok = TRUE;
1815 BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0);
1816 BOOL expn = (options & vopt_expn) != 0;
1817 BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0;
1818 int i;
1819 int yield = OK;
1820 int verify_type = expn? v_expn :
1821 address_test_mode? v_none :
1822 options & vopt_is_recipient? v_recipient : v_sender;
1823 address_item *addr_list;
1824 address_item *addr_new = NULL;
1825 address_item *addr_remote = NULL;
1826 address_item *addr_local = NULL;
1827 address_item *addr_succeed = NULL;
1828 uschar **failure_ptr = options & vopt_is_recipient
1829 ? &recipient_verify_failure : &sender_verify_failure;
1830 uschar *ko_prefix, *cr;
1831 uschar *address = vaddr->address;
1832 uschar *save_sender;
1833 uschar null_sender[] = { 0 }; /* Ensure writeable memory */
1834
1835 /* Clear, just in case */
1836
1837 *failure_ptr = NULL;
1838
1839 /* Set up a prefix and suffix for error message which allow us to use the same
1840 output statements both in EXPN mode (where an SMTP response is needed) and when
1841 debugging with an output file. */
1842
1843 if (expn)
1844 {
1845 ko_prefix = US"553 ";
1846 cr = US"\r";
1847 }
1848 else ko_prefix = cr = US"";
1849
1850 /* Add qualify domain if permitted; otherwise an unqualified address fails. */
1851
1852 if (parse_find_at(address) == NULL)
1853 {
1854 if ((options & vopt_qualify) == 0)
1855 {
1856 if (f != NULL)
1857 respond_printf(f, "%sA domain is required for \"%s\"%s\n",
1858 ko_prefix, address, cr);
1859 *failure_ptr = US"qualify";
1860 return FAIL;
1861 }
1862 address = rewrite_address_qualify(address, options & vopt_is_recipient);
1863 }
1864
1865 DEBUG(D_verify)
1866 {
1867 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1868 debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address);
1869 }
1870
1871 /* Rewrite and report on it. Clear the domain and local part caches - these
1872 may have been set by domains and local part tests during an ACL. */
1873
1874 if (global_rewrite_rules != NULL)
1875 {
1876 uschar *old = address;
1877 address = rewrite_address(address, options & vopt_is_recipient, FALSE,
1878 global_rewrite_rules, rewrite_existflags);
1879 if (address != old)
1880 {
1881 for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0;
1882 for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0;
1883 if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address);
1884 }
1885 }
1886
1887 /* If this is the real sender address, we must update sender_address at
1888 this point, because it may be referred to in the routers. */
1889
1890 if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0)
1891 sender_address = address;
1892
1893 /* If the address was rewritten to <> no verification can be done, and we have
1894 to return OK. This rewriting is permitted only for sender addresses; for other
1895 addresses, such rewriting fails. */
1896
1897 if (address[0] == 0) return OK;
1898
1899 /* Flip the legacy TLS-related variables over to the outbound set in case
1900 they're used in the context of a transport used by verification. Reset them
1901 at exit from this routine (so no returns allowed from here on). */
1902
1903 tls_modify_variables(&tls_out);
1904
1905 /* Save a copy of the sender address for re-instating if we change it to <>
1906 while verifying a sender address (a nice bit of self-reference there). */
1907
1908 save_sender = sender_address;
1909
1910 /* Observability variable for router/transport use */
1911
1912 verify_mode = options & vopt_is_recipient ? US"R" : US"S";
1913
1914 /* Update the address structure with the possibly qualified and rewritten
1915 address. Set it up as the starting address on the chain of new addresses. */
1916
1917 vaddr->address = address;
1918 addr_new = vaddr;
1919
1920 /* We need a loop, because an address can generate new addresses. We must also
1921 cope with generated pipes and files at the top level. (See also the code and
1922 comment in deliver.c.) However, it is usually the case that the router for
1923 user's .forward files has its verify flag turned off.
1924
1925 If an address generates more than one child, the loop is used only when
1926 full_info is set, and this can only be set locally. Remote enquiries just get
1927 information about the top level address, not anything that it generated. */
1928
1929 while (addr_new)
1930 {
1931 int rc;
1932 address_item *addr = addr_new;
1933
1934 addr_new = addr->next;
1935 addr->next = NULL;
1936
1937 DEBUG(D_verify)
1938 {
1939 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1940 debug_printf("Considering %s\n", addr->address);
1941 }
1942
1943 /* Handle generated pipe, file or reply addresses. We don't get these
1944 when handling EXPN, as it does only one level of expansion. */
1945
1946 if (testflag(addr, af_pfr))
1947 {
1948 allok = FALSE;
1949 if (f != NULL)
1950 {
1951 BOOL allow;
1952
1953 if (addr->address[0] == '>')
1954 {
1955 allow = testflag(addr, af_allow_reply);
1956 fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1);
1957 }
1958 else
1959 {
1960 allow = (addr->address[0] == '|')?
1961 testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file);
1962 fprintf(f, "%s -> %s", addr->parent->address, addr->address);
1963 }
1964
1965 if (addr->basic_errno == ERRNO_BADTRANSPORT)
1966 fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n"
1967 "%s\n", addr->message);
1968 else if (allow)
1969 fprintf(f, "\n transport = %s\n", addr->transport->name);
1970 else
1971 fprintf(f, " *** forbidden ***\n");
1972 }
1973 continue;
1974 }
1975
1976 /* Just in case some router parameter refers to it. */
1977
1978 return_path = addr->prop.errors_address
1979 ? addr->prop.errors_address : sender_address;
1980
1981 /* Split the address into domain and local part, handling the %-hack if
1982 necessary, and then route it. While routing a sender address, set
1983 $sender_address to <> because that is what it will be if we were trying to
1984 send a bounce to the sender. */
1985
1986 if (routed) *routed = FALSE;
1987 if ((rc = deliver_split_address(addr)) == OK)
1988 {
1989 if (!(options & vopt_is_recipient)) sender_address = null_sender;
1990 rc = route_address(addr, &addr_local, &addr_remote, &addr_new,
1991 &addr_succeed, verify_type);
1992 sender_address = save_sender; /* Put back the real sender */
1993 }
1994
1995 /* If routing an address succeeded, set the flag that remembers, for use when
1996 an ACL cached a sender verify (in case a callout fails). Then if routing set
1997 up a list of hosts or the transport has a host list, and the callout option
1998 is set, and we aren't in a host checking run, do the callout verification,
1999 and set another flag that notes that a callout happened. */
2000
2001 if (rc == OK)
2002 {
2003 if (routed) *routed = TRUE;
2004 if (callout > 0)
2005 {
2006 transport_instance * tp;
2007 host_item * host_list = addr->host_list;
2008
2009 /* Make up some data for use in the case where there is no remote
2010 transport. */
2011
2012 transport_feedback tf = {
2013 NULL, /* interface (=> any) */
2014 US"smtp", /* port */
2015 US"smtp", /* protocol */
2016 NULL, /* hosts */
2017 US"$smtp_active_hostname", /* helo_data */
2018 FALSE, /* hosts_override */
2019 FALSE, /* hosts_randomize */
2020 FALSE, /* gethostbyname */
2021 TRUE, /* qualify_single */
2022 FALSE /* search_parents */
2023 };
2024
2025 /* If verification yielded a remote transport, we want to use that
2026 transport's options, so as to mimic what would happen if we were really
2027 sending a message to this address. */
2028
2029 if ((tp = addr->transport) && !tp->info->local)
2030 {
2031 (void)(tp->setup)(tp, addr, &tf, 0, 0, NULL);
2032
2033 /* If the transport has hosts and the router does not, or if the
2034 transport is configured to override the router's hosts, we must build a
2035 host list of the transport's hosts, and find the IP addresses */
2036
2037 if (tf.hosts && (!host_list || tf.hosts_override))
2038 {
2039 uschar *s;
2040 const uschar *save_deliver_domain = deliver_domain;
2041 uschar *save_deliver_localpart = deliver_localpart;
2042
2043 host_list = NULL; /* Ignore the router's hosts */
2044
2045 deliver_domain = addr->domain;
2046 deliver_localpart = addr->local_part;
2047 s = expand_string(tf.hosts);
2048 deliver_domain = save_deliver_domain;
2049 deliver_localpart = save_deliver_localpart;
2050
2051 if (!s)
2052 {
2053 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts "
2054 "\"%s\" in %s transport for callout: %s", tf.hosts,
2055 tp->name, expand_string_message);
2056 }
2057 else
2058 {
2059 int flags;
2060 host_item *host, *nexthost;
2061 host_build_hostlist(&host_list, s, tf.hosts_randomize);
2062
2063 /* Just ignore failures to find a host address. If we don't manage
2064 to find any addresses, the callout will defer. Note that more than
2065 one address may be found for a single host, which will result in
2066 additional host items being inserted into the chain. Hence we must
2067 save the next host first. */
2068
2069 flags = HOST_FIND_BY_A;
2070 if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2071 if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2072
2073 for (host = host_list; host; host = nexthost)
2074 {
2075 nexthost = host->next;
2076 if (tf.gethostbyname ||
2077 string_is_ip_address(host->name, NULL) != 0)
2078 (void)host_find_byname(host, NULL, flags, NULL, TRUE);
2079 else
2080 {
2081 dnssec_domains * dnssec_domains = NULL;
2082 if (Ustrcmp(tp->driver_name, "smtp") == 0)
2083 {
2084 smtp_transport_options_block * ob =
2085 (smtp_transport_options_block *) tp->options_block;
2086 dnssec_domains = &ob->dnssec;
2087 }
2088
2089 (void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2090 dnssec_domains, NULL, NULL);
2091 }
2092 }
2093 }
2094 }
2095 }
2096
2097 /* Can only do a callout if we have at least one host! If the callout
2098 fails, it will have set ${sender,recipient}_verify_failure. */
2099
2100 if (host_list)
2101 {
2102 HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n");
2103 if (host_checking && !host_checking_callout)
2104 {
2105 HDEBUG(D_verify)
2106 debug_printf("... callout omitted by default when host testing\n"
2107 "(Use -bhc if you want the callouts to happen.)\n");
2108 }
2109 else
2110 {
2111 #ifdef SUPPORT_TLS
2112 deliver_set_expansions(addr);
2113 #endif
2114 rc = do_callout(addr, host_list, &tf, callout, callout_overall,
2115 callout_connect, options, se_mailfrom, pm_mailfrom);
2116 }
2117 }
2118 else
2119 {
2120 HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor "
2121 "transport provided a host list\n");
2122 }
2123 }
2124 }
2125
2126 /* Otherwise, any failure is a routing failure */
2127
2128 else *failure_ptr = US"route";
2129
2130 /* A router may return REROUTED if it has set up a child address as a result
2131 of a change of domain name (typically from widening). In this case we always
2132 want to continue to verify the new child. */
2133
2134 if (rc == REROUTED) continue;
2135
2136 /* Handle hard failures */
2137
2138 if (rc == FAIL)
2139 {
2140 allok = FALSE;
2141 if (f)
2142 {
2143 address_item *p = addr->parent;
2144
2145 respond_printf(f, "%s%s %s", ko_prefix,
2146 full_info ? addr->address : address,
2147 address_test_mode ? "is undeliverable" : "failed to verify");
2148 if (!expn && admin_user)
2149 {
2150 if (addr->basic_errno > 0)
2151 respond_printf(f, ": %s", strerror(addr->basic_errno));
2152 if (addr->message)
2153 respond_printf(f, ": %s", addr->message);
2154 }
2155
2156 /* Show parents iff doing full info */
2157
2158 if (full_info) while (p)
2159 {
2160 respond_printf(f, "%s\n <-- %s", cr, p->address);
2161 p = p->parent;
2162 }
2163 respond_printf(f, "%s\n", cr);
2164 }
2165 cancel_cutthrough_connection("routing hard fail");
2166
2167 if (!full_info)
2168 {
2169 yield = copy_error(vaddr, addr, FAIL);
2170 goto out;
2171 }
2172 yield = FAIL;
2173 }
2174
2175 /* Soft failure */
2176
2177 else if (rc == DEFER)
2178 {
2179 allok = FALSE;
2180 if (f)
2181 {
2182 address_item *p = addr->parent;
2183 respond_printf(f, "%s%s cannot be resolved at this time", ko_prefix,
2184 full_info? addr->address : address);
2185 if (!expn && admin_user)
2186 {
2187 if (addr->basic_errno > 0)
2188 respond_printf(f, ": %s", strerror(addr->basic_errno));
2189 if (addr->message)
2190 respond_printf(f, ": %s", addr->message);
2191 else if (addr->basic_errno <= 0)
2192 respond_printf(f, ": unknown error");
2193 }
2194
2195 /* Show parents iff doing full info */
2196
2197 if (full_info) while (p)
2198 {
2199 respond_printf(f, "%s\n <-- %s", cr, p->address);
2200 p = p->parent;
2201 }
2202 respond_printf(f, "%s\n", cr);
2203 }
2204 cancel_cutthrough_connection("routing soft fail");
2205
2206 if (!full_info)
2207 {
2208 yield = copy_error(vaddr, addr, DEFER);
2209 goto out;
2210 }
2211 if (yield == OK) yield = DEFER;
2212 }
2213
2214 /* If we are handling EXPN, we do not want to continue to route beyond
2215 the top level (whose address is in "address"). */
2216
2217 else if (expn)
2218 {
2219 uschar *ok_prefix = US"250-";
2220
2221 if (!addr_new)
2222 if (!addr_local && !addr_remote)
2223 respond_printf(f, "250 mail to <%s> is discarded\r\n", address);
2224 else
2225 respond_printf(f, "250 <%s>\r\n", address);
2226
2227 else do
2228 {
2229 address_item *addr2 = addr_new;
2230 addr_new = addr2->next;
2231 if (!addr_new) ok_prefix = US"250 ";
2232 respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address);
2233 } while (addr_new);
2234 yield = OK;
2235 goto out;
2236 }
2237
2238 /* Successful routing other than EXPN. */
2239
2240 else
2241 {
2242 /* Handle successful routing when short info wanted. Otherwise continue for
2243 other (generated) addresses. Short info is the operational case. Full info
2244 can be requested only when debug_selector != 0 and a file is supplied.
2245
2246 There is a conflict between the use of aliasing as an alternate email
2247 address, and as a sort of mailing list. If an alias turns the incoming
2248 address into just one address (e.g. J.Caesar->jc44) you may well want to
2249 carry on verifying the generated address to ensure it is valid when
2250 checking incoming mail. If aliasing generates multiple addresses, you
2251 probably don't want to do this. Exim therefore treats the generation of
2252 just a single new address as a special case, and continues on to verify the
2253 generated address. */
2254
2255 if ( !full_info /* Stop if short info wanted AND */
2256 && ( ( !addr_new /* No new address OR */
2257 || addr_new->next /* More than one new address OR */
2258 || testflag(addr_new, af_pfr) /* New address is pfr */
2259 )
2260 || /* OR */
2261 ( addr_new /* At least one new address AND */
2262 && success_on_redirect /* success_on_redirect is set */
2263 ) )
2264 )
2265 {
2266 if (f) fprintf(f, "%s %s\n",
2267 address, address_test_mode ? "is deliverable" : "verified");
2268
2269 /* If we have carried on to verify a child address, we want the value
2270 of $address_data to be that of the child */
2271
2272 vaddr->prop.address_data = addr->prop.address_data;
2273
2274 /* If stopped because more than one new address, cannot cutthrough */
2275
2276 if (addr_new && addr_new->next)
2277 cancel_cutthrough_connection("multiple addresses from routing");
2278
2279 yield = OK;
2280 goto out;
2281 }
2282 }
2283 } /* Loop for generated addresses */
2284
2285 /* Display the full results of the successful routing, including any generated
2286 addresses. Control gets here only when full_info is set, which requires f not
2287 to be NULL, and this occurs only when a top-level verify is called with the
2288 debugging switch on.
2289
2290 If there are no local and no remote addresses, and there were no pipes, files,
2291 or autoreplies, and there were no errors or deferments, the message is to be
2292 discarded, usually because of the use of :blackhole: in an alias file. */
2293
2294 if (allok && !addr_local && !addr_remote)
2295 {
2296 fprintf(f, "mail to %s is discarded\n", address);
2297 goto out;
2298 }
2299
2300 for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
2301 while (addr_list)
2302 {
2303 address_item *addr = addr_list;
2304 address_item *p = addr->parent;
2305 transport_instance * tp = addr->transport;
2306
2307 addr_list = addr->next;
2308
2309 fprintf(f, "%s", CS addr->address);
2310 #ifdef EXPERIMENTAL_SRS
2311 if(addr->prop.srs_sender)
2312 fprintf(f, " [srs = %s]", addr->prop.srs_sender);
2313 #endif
2314
2315 /* If the address is a duplicate, show something about it. */
2316
2317 if (!testflag(addr, af_pfr))
2318 {
2319 tree_node *tnode;
2320 if ((tnode = tree_search(tree_duplicates, addr->unique)))
2321 fprintf(f, " [duplicate, would not be delivered]");
2322 else tree_add_duplicate(addr->unique, addr);
2323 }
2324
2325 /* Now show its parents */
2326
2327 for (p = addr->parent; p; p = p->parent)
2328 fprintf(f, "\n <-- %s", p->address);
2329 fprintf(f, "\n ");
2330
2331 /* Show router, and transport */
2332
2333 fprintf(f, "router = %s, transport = %s\n",
2334 addr->router->name, tp ? tp->name : US"unset");
2335
2336 /* Show any hosts that are set up by a router unless the transport
2337 is going to override them; fiddle a bit to get a nice format. */
2338
2339 if (addr->host_list && tp && !tp->overrides_hosts)
2340 {
2341 host_item *h;
2342 int maxlen = 0;
2343 int maxaddlen = 0;
2344 for (h = addr->host_list; h; h = h->next)
2345 { /* get max lengths of host names, addrs */
2346 int len = Ustrlen(h->name);
2347 if (len > maxlen) maxlen = len;
2348 len = h->address ? Ustrlen(h->address) : 7;
2349 if (len > maxaddlen) maxaddlen = len;
2350 }
2351 for (h = addr->host_list; h; h = h->next)
2352 {
2353 fprintf(f, " host %-*s ", maxlen, h->name);
2354
2355 if (h->address)
2356 fprintf(f, "[%s%-*c", h->address, maxaddlen+1 - Ustrlen(h->address), ']');
2357 else if (tp->info->local)
2358 fprintf(f, " %-*s ", maxaddlen, ""); /* Omit [unknown] for local */
2359 else
2360 fprintf(f, "[%s%-*c", "unknown", maxaddlen+1 - 7, ']');
2361
2362 if (h->mx >= 0) fprintf(f, " MX=%d", h->mx);
2363 if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port);
2364 if (running_in_test_harness && h->dnssec == DS_YES) fputs(" AD", f);
2365 if (h->status == hstatus_unusable) fputs(" ** unusable **", f);
2366 fputc('\n', f);
2367 }
2368 }
2369 }
2370
2371 /* Yield will be DEFER or FAIL if any one address has, only for full_info (which is
2372 the -bv or -bt case). */
2373
2374 out:
2375 verify_mode = NULL;
2376 tls_modify_variables(&tls_in);
2377
2378 return yield;
2379 }
2380
2381
2382
2383
2384 /*************************************************
2385 * Check headers for syntax errors *
2386 *************************************************/
2387
2388 /* This function checks those header lines that contain addresses, and verifies
2389 that all the addresses therein are syntactially correct.
2390
2391 Arguments:
2392 msgptr where to put an error message
2393
2394 Returns: OK
2395 FAIL
2396 */
2397
2398 int
2399 verify_check_headers(uschar **msgptr)
2400 {
2401 header_line *h;
2402 uschar *colon, *s;
2403 int yield = OK;
2404
2405 for (h = header_list; h != NULL && yield == OK; h = h->next)
2406 {
2407 if (h->type != htype_from &&
2408 h->type != htype_reply_to &&
2409 h->type != htype_sender &&
2410 h->type != htype_to &&
2411 h->type != htype_cc &&
2412 h->type != htype_bcc)
2413 continue;
2414
2415 colon = Ustrchr(h->text, ':');
2416 s = colon + 1;
2417 while (isspace(*s)) s++;
2418
2419 /* Loop for multiple addresses in the header, enabling group syntax. Note
2420 that we have to reset this after the header has been scanned. */
2421
2422 parse_allow_group = TRUE;
2423
2424 while (*s != 0)
2425 {
2426 uschar *ss = parse_find_address_end(s, FALSE);
2427 uschar *recipient, *errmess;
2428 int terminator = *ss;
2429 int start, end, domain;
2430
2431 /* Temporarily terminate the string at this point, and extract the
2432 operative address within, allowing group syntax. */
2433
2434 *ss = 0;
2435 recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
2436 *ss = terminator;
2437
2438 /* Permit an unqualified address only if the message is local, or if the
2439 sending host is configured to be permitted to send them. */
2440
2441 if (recipient != NULL && domain == 0)
2442 {
2443 if (h->type == htype_from || h->type == htype_sender)
2444 {
2445 if (!allow_unqualified_sender) recipient = NULL;
2446 }
2447 else
2448 {
2449 if (!allow_unqualified_recipient) recipient = NULL;
2450 }
2451 if (recipient == NULL) errmess = US"unqualified address not permitted";
2452 }
2453
2454 /* It's an error if no address could be extracted, except for the special
2455 case of an empty address. */
2456
2457 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2458 {
2459 uschar *verb = US"is";
2460 uschar *t = ss;
2461 uschar *tt = colon;
2462 int len;
2463
2464 /* Arrange not to include any white space at the end in the
2465 error message or the header name. */
2466
2467 while (t > s && isspace(t[-1])) t--;
2468 while (tt > h->text && isspace(tt[-1])) tt--;
2469
2470 /* Add the address that failed to the error message, since in a
2471 header with very many addresses it is sometimes hard to spot
2472 which one is at fault. However, limit the amount of address to
2473 quote - cases have been seen where, for example, a missing double
2474 quote in a humungous To: header creates an "address" that is longer
2475 than string_sprintf can handle. */
2476
2477 len = t - s;
2478 if (len > 1024)
2479 {
2480 len = 1024;
2481 verb = US"begins";
2482 }
2483
2484 /* deconst cast ok as we're passing a non-const to string_printing() */
2485 *msgptr = US string_printing(
2486 string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s",
2487 errmess, tt - h->text, h->text, verb, len, s));
2488
2489 yield = FAIL;
2490 break; /* Out of address loop */
2491 }
2492
2493 /* Advance to the next address */
2494
2495 s = ss + (terminator? 1:0);
2496 while (isspace(*s)) s++;
2497 } /* Next address */
2498
2499 parse_allow_group = FALSE;
2500 parse_found_group = FALSE;
2501 } /* Next header unless yield has been set FALSE */
2502
2503 return yield;
2504 }
2505
2506
2507 /*************************************************
2508 * Check header names for 8-bit characters *
2509 *************************************************/
2510
2511 /* This function checks for invalid charcters in header names. See
2512 RFC 5322, 2.2. and RFC 6532, 3.
2513
2514 Arguments:
2515 msgptr where to put an error message
2516
2517 Returns: OK
2518 FAIL
2519 */
2520
2521 int
2522 verify_check_header_names_ascii(uschar **msgptr)
2523 {
2524 header_line *h;
2525 uschar *colon, *s;
2526
2527 for (h = header_list; h != NULL; h = h->next)
2528 {
2529 colon = Ustrchr(h->text, ':');
2530 for(s = h->text; s < colon; s++)
2531 {
2532 if ((*s < 33) || (*s > 126))
2533 {
2534 *msgptr = string_sprintf("Invalid character in header \"%.*s\" found",
2535 colon - h->text, h->text);
2536 return FAIL;
2537 }
2538 }
2539 }
2540 return OK;
2541 }
2542
2543 /*************************************************
2544 * Check for blind recipients *
2545 *************************************************/
2546
2547 /* This function checks that every (envelope) recipient is mentioned in either
2548 the To: or Cc: header lines, thus detecting blind carbon copies.
2549
2550 There are two ways of scanning that could be used: either scan the header lines
2551 and tick off the recipients, or scan the recipients and check the header lines.
2552 The original proposed patch did the former, but I have chosen to do the latter,
2553 because (a) it requires no memory and (b) will use fewer resources when there
2554 are many addresses in To: and/or Cc: and only one or two envelope recipients.
2555
2556 Arguments: none
2557 Returns: OK if there are no blind recipients
2558 FAIL if there is at least one blind recipient
2559 */
2560
2561 int
2562 verify_check_notblind(void)
2563 {
2564 int i;
2565 for (i = 0; i < recipients_count; i++)
2566 {
2567 header_line *h;
2568 BOOL found = FALSE;
2569 uschar *address = recipients_list[i].address;
2570
2571 for (h = header_list; !found && h != NULL; h = h->next)
2572 {
2573 uschar *colon, *s;
2574
2575 if (h->type != htype_to && h->type != htype_cc) continue;
2576
2577 colon = Ustrchr(h->text, ':');
2578 s = colon + 1;
2579 while (isspace(*s)) s++;
2580
2581 /* Loop for multiple addresses in the header, enabling group syntax. Note
2582 that we have to reset this after the header has been scanned. */
2583
2584 parse_allow_group = TRUE;
2585
2586 while (*s != 0)
2587 {
2588 uschar *ss = parse_find_address_end(s, FALSE);
2589 uschar *recipient,*errmess;
2590 int terminator = *ss;
2591 int start, end, domain;
2592
2593 /* Temporarily terminate the string at this point, and extract the
2594 operative address within, allowing group syntax. */
2595
2596 *ss = 0;
2597 recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
2598 *ss = terminator;
2599
2600 /* If we found a valid recipient that has a domain, compare it with the
2601 envelope recipient. Local parts are compared case-sensitively, domains
2602 case-insensitively. By comparing from the start with length "domain", we
2603 include the "@" at the end, which ensures that we are comparing the whole
2604 local part of each address. */
2605
2606 if (recipient != NULL && domain != 0)
2607 {
2608 found = Ustrncmp(recipient, address, domain) == 0 &&
2609 strcmpic(recipient + domain, address + domain) == 0;
2610 if (found) break;
2611 }
2612
2613 /* Advance to the next address */
2614
2615 s = ss + (terminator? 1:0);
2616 while (isspace(*s)) s++;
2617 } /* Next address */
2618
2619 parse_allow_group = FALSE;
2620 parse_found_group = FALSE;
2621 } /* Next header (if found is false) */
2622
2623 if (!found) return FAIL;
2624 } /* Next recipient */
2625
2626 return OK;
2627 }
2628
2629
2630
2631 /*************************************************
2632 * Find if verified sender *
2633 *************************************************/
2634
2635 /* Usually, just a single address is verified as the sender of the message.
2636 However, Exim can be made to verify other addresses as well (often related in
2637 some way), and this is useful in some environments. There may therefore be a
2638 chain of such addresses that have previously been tested. This function finds
2639 whether a given address is on the chain.
2640
2641 Arguments: the address to be verified
2642 Returns: pointer to an address item, or NULL
2643 */
2644
2645 address_item *
2646 verify_checked_sender(uschar *sender)
2647 {
2648 address_item *addr;
2649 for (addr = sender_verified_list; addr != NULL; addr = addr->next)
2650 if (Ustrcmp(sender, addr->address) == 0) break;
2651 return addr;
2652 }
2653
2654
2655
2656
2657
2658 /*************************************************
2659 * Get valid header address *
2660 *************************************************/
2661
2662 /* Scan the originator headers of the message, looking for an address that
2663 verifies successfully. RFC 822 says:
2664
2665 o The "Sender" field mailbox should be sent notices of
2666 any problems in transport or delivery of the original
2667 messages. If there is no "Sender" field, then the
2668 "From" field mailbox should be used.
2669
2670 o If the "Reply-To" field exists, then the reply should
2671 go to the addresses indicated in that field and not to
2672 the address(es) indicated in the "From" field.
2673
2674 So we check a Sender field if there is one, else a Reply_to field, else a From
2675 field. As some strange messages may have more than one of these fields,
2676 especially if they are resent- fields, check all of them if there is more than
2677 one.
2678
2679 Arguments:
2680 user_msgptr points to where to put a user error message
2681 log_msgptr points to where to put a log error message
2682 callout timeout for callout check (passed to verify_address())
2683 callout_overall overall callout timeout (ditto)
2684 callout_connect connect callout timeout (ditto)
2685 se_mailfrom mailfrom for verify; NULL => ""
2686 pm_mailfrom sender for pm callout check (passed to verify_address())
2687 options callout options (passed to verify_address())
2688 verrno where to put the address basic_errno
2689
2690 If log_msgptr is set to something without setting user_msgptr, the caller
2691 normally uses log_msgptr for both things.
2692
2693 Returns: result of the verification attempt: OK, FAIL, or DEFER;
2694 FAIL is given if no appropriate headers are found
2695 */
2696
2697 int
2698 verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr,
2699 int callout, int callout_overall, int callout_connect, uschar *se_mailfrom,
2700 uschar *pm_mailfrom, int options, int *verrno)
2701 {
2702 static int header_types[] = { htype_sender, htype_reply_to, htype_from };
2703 BOOL done = FALSE;
2704 int yield = FAIL;
2705 int i;
2706
2707 for (i = 0; i < 3 && !done; i++)
2708 {
2709 header_line *h;
2710 for (h = header_list; h != NULL && !done; h = h->next)
2711 {
2712 int terminator, new_ok;
2713 uschar *s, *ss, *endname;
2714
2715 if (h->type != header_types[i]) continue;
2716 s = endname = Ustrchr(h->text, ':') + 1;
2717
2718 /* Scan the addresses in the header, enabling group syntax. Note that we
2719 have to reset this after the header has been scanned. */
2720
2721 parse_allow_group = TRUE;
2722
2723 while (*s != 0)
2724 {
2725 address_item *vaddr;
2726
2727 while (isspace(*s) || *s == ',') s++;
2728 if (*s == 0) break; /* End of header */
2729
2730 ss = parse_find_address_end(s, FALSE);
2731
2732 /* The terminator is a comma or end of header, but there may be white
2733 space preceding it (including newline for the last address). Move back
2734 past any white space so we can check against any cached envelope sender
2735 address verifications. */
2736
2737 while (isspace(ss[-1])) ss--;
2738 terminator = *ss;
2739 *ss = 0;
2740
2741 HDEBUG(D_verify) debug_printf("verifying %.*s header address %s\n",
2742 (int)(endname - h->text), h->text, s);
2743
2744 /* See if we have already verified this address as an envelope sender,
2745 and if so, use the previous answer. */
2746
2747 vaddr = verify_checked_sender(s);
2748
2749 if (vaddr != NULL && /* Previously checked */
2750 (callout <= 0 || /* No callout needed; OR */
2751 vaddr->special_action > 256)) /* Callout was done */
2752 {
2753 new_ok = vaddr->special_action & 255;
2754 HDEBUG(D_verify) debug_printf("previously checked as envelope sender\n");
2755 *ss = terminator; /* Restore shortened string */
2756 }
2757
2758 /* Otherwise we run the verification now. We must restore the shortened
2759 string before running the verification, so the headers are correct, in
2760 case there is any rewriting. */
2761
2762 else
2763 {
2764 int start, end, domain;
2765 uschar *address = parse_extract_address(s, log_msgptr, &start, &end,
2766 &domain, FALSE);
2767
2768 *ss = terminator;
2769
2770 /* If we found an empty address, just carry on with the next one, but
2771 kill the message. */
2772
2773 if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0)
2774 {
2775 *log_msgptr = NULL;
2776 s = ss;
2777 continue;
2778 }
2779
2780 /* If verification failed because of a syntax error, fail this
2781 function, and ensure that the failing address gets added to the error
2782 message. */
2783
2784 if (address == NULL)
2785 {
2786 new_ok = FAIL;
2787 while (ss > s && isspace(ss[-1])) ss--;
2788 *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
2789 "scanning for sender: %s in \"%.*s\"",
2790 endname - h->text, h->text, *log_msgptr, ss - s, s);
2791 yield = FAIL;
2792 done = TRUE;
2793 break;
2794 }
2795
2796 /* Else go ahead with the sender verification. But it isn't *the*
2797 sender of the message, so set vopt_fake_sender to stop sender_address
2798 being replaced after rewriting or qualification. */
2799
2800 else
2801 {
2802 vaddr = deliver_make_addr(address, FALSE);
2803 new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender,
2804 callout, callout_overall, callout_connect, se_mailfrom,
2805 pm_mailfrom, NULL);
2806 }
2807 }
2808
2809 /* We now have the result, either newly found, or cached. If we are
2810 giving out error details, set a specific user error. This means that the
2811 last of these will be returned to the user if all three fail. We do not
2812 set a log message - the generic one below will be used. */
2813
2814 if (new_ok != OK)
2815 {
2816 *verrno = vaddr->basic_errno;
2817 if (smtp_return_error_details)
2818 {
2819 *user_msgptr = string_sprintf("Rejected after DATA: "
2820 "could not verify \"%.*s\" header address\n%s: %s",
2821 endname - h->text, h->text, vaddr->address, vaddr->message);
2822 }
2823 }
2824
2825 /* Success or defer */
2826
2827 if (new_ok == OK)
2828 {
2829 yield = OK;
2830 done = TRUE;
2831 break;
2832 }
2833
2834 if (new_ok == DEFER) yield = DEFER;
2835
2836 /* Move on to any more addresses in the header */
2837
2838 s = ss;
2839 } /* Next address */
2840
2841 parse_allow_group = FALSE;
2842 parse_found_group = FALSE;
2843 } /* Next header, unless done */
2844 } /* Next header type unless done */
2845
2846 if (yield == FAIL && *log_msgptr == NULL)
2847 *log_msgptr = US"there is no valid sender in any header line";
2848
2849 if (yield == DEFER && *log_msgptr == NULL)
2850 *log_msgptr = US"all attempts to verify a sender in a header line deferred";
2851
2852 return yield;
2853 }
2854
2855
2856
2857
2858 /*************************************************
2859 * Get RFC 1413 identification *
2860 *************************************************/
2861
2862 /* Attempt to get an id from the sending machine via the RFC 1413 protocol. If
2863 the timeout is set to zero, then the query is not done. There may also be lists
2864 of hosts and nets which are exempt. To guard against malefactors sending
2865 non-printing characters which could, for example, disrupt a message's headers,
2866 make sure the string consists of printing characters only.
2867
2868 Argument:
2869 port the port to connect to; usually this is IDENT_PORT (113), but when
2870 running in the test harness with -bh a different value is used.
2871
2872 Returns: nothing
2873
2874 Side effect: any received ident value is put in sender_ident (NULL otherwise)
2875 */
2876
2877 void
2878 verify_get_ident(int port)
2879 {
2880 int sock, host_af, qlen;
2881 int received_sender_port, received_interface_port, n;
2882 uschar *p;
2883 uschar buffer[2048];
2884
2885 /* Default is no ident. Check whether we want to do an ident check for this
2886 host. */
2887
2888 sender_ident = NULL;
2889 if (rfc1413_query_timeout <= 0 || verify_check_host(&rfc1413_hosts) != OK)
2890 return;
2891
2892 DEBUG(D_ident) debug_printf("doing ident callback\n");
2893
2894 /* Set up a connection to the ident port of the remote host. Bind the local end
2895 to the incoming interface address. If the sender host address is an IPv6
2896 address, the incoming interface address will also be IPv6. */
2897
2898 host_af = (Ustrchr(sender_host_address, ':') == NULL)? AF_INET : AF_INET6;
2899 sock = ip_socket(SOCK_STREAM, host_af);
2900 if (sock < 0) return;
2901
2902 if (ip_bind(sock, host_af, interface_address, 0) < 0)
2903 {
2904 DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n",
2905 strerror(errno));
2906 goto END_OFF;
2907 }
2908
2909 if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout)
2910 < 0)
2911 {
2912 if (errno == ETIMEDOUT && LOGGING(ident_timeout))
2913 {
2914 log_write(0, LOG_MAIN, "ident connection to %s timed out",
2915 sender_host_address);
2916 }
2917 else
2918 {
2919 DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n",
2920 sender_host_address, strerror(errno));
2921 }
2922 goto END_OFF;
2923 }
2924
2925 /* Construct and send the query. */
2926
2927 sprintf(CS buffer, "%d , %d\r\n", sender_host_port, interface_port);
2928 qlen = Ustrlen(buffer);
2929 if (send(sock, buffer, qlen, 0) < 0)
2930 {
2931 DEBUG(D_ident) debug_printf("ident send failed: %s\n", strerror(errno));
2932 goto END_OFF;
2933 }
2934
2935 /* Read a response line. We put it into the rest of the buffer, using several
2936 recv() calls if necessary. */
2937
2938 p = buffer + qlen;
2939
2940 for (;;)
2941 {
2942 uschar *pp;
2943 int count;
2944 int size = sizeof(buffer) - (p - buffer);
2945
2946 if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */
2947 count = ip_recv(sock, p, size, rfc1413_query_timeout);
2948 if (count <= 0) goto END_OFF; /* Read error or EOF */
2949
2950 /* Scan what we just read, to see if we have reached the terminating \r\n. Be
2951 generous, and accept a plain \n terminator as well. The only illegal
2952 character is 0. */
2953
2954 for (pp = p; pp < p + count; pp++)
2955 {
2956 if (*pp == 0) goto END_OFF; /* Zero octet not allowed */
2957 if (*pp == '\n')
2958 {
2959 if (pp[-1] == '\r') pp--;
2960 *pp = 0;
2961 goto GOT_DATA; /* Break out of both loops */
2962 }
2963 }
2964
2965 /* Reached the end of the data without finding \n. Let the loop continue to
2966 read some more, if there is room. */
2967
2968 p = pp;
2969 }
2970
2971 GOT_DATA:
2972
2973 /* We have received a line of data. Check it carefully. It must start with the
2974 same two port numbers that we sent, followed by data as defined by the RFC. For
2975 example,
2976
2977 12345 , 25 : USERID : UNIX :root
2978
2979 However, the amount of white space may be different to what we sent. In the
2980 "osname" field there may be several sub-fields, comma separated. The data we
2981 actually want to save follows the third colon. Some systems put leading spaces
2982 in it - we discard those. */
2983
2984 if (sscanf(CS buffer + qlen, "%d , %d%n", &received_sender_port,
2985 &received_interface_port, &n) != 2 ||
2986 received_sender_port != sender_host_port ||
2987 received_interface_port != interface_port)
2988 goto END_OFF;
2989
2990 p = buffer + qlen + n;
2991 while(isspace(*p)) p++;
2992 if (*p++ != ':') goto END_OFF;
2993 while(isspace(*p)) p++;
2994 if (Ustrncmp(p, "USERID", 6) != 0) goto END_OFF;
2995 p += 6;
2996 while(isspace(*p)) p++;
2997 if (*p++ != ':') goto END_OFF;
2998 while (*p != 0 && *p != ':') p++;
2999 if (*p++ == 0) goto END_OFF;
3000 while(isspace(*p)) p++;
3001 if (*p == 0) goto END_OFF;
3002
3003 /* The rest of the line is the data we want. We turn it into printing
3004 characters when we save it, so that it cannot mess up the format of any logging
3005 or Received: lines into which it gets inserted. We keep a maximum of 127
3006 characters. The deconst cast is ok as we fed a nonconst to string_printing() */
3007
3008 sender_ident = US string_printing(string_copyn(p, 127));
3009 DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident);
3010
3011 END_OFF:
3012 (void)close(sock);
3013 return;
3014 }
3015
3016
3017
3018
3019 /*************************************************
3020 * Match host to a single host-list item *
3021 *************************************************/
3022
3023 /* This function compares a host (name or address) against a single item
3024 from a host list. The host name gets looked up if it is needed and is not
3025 already known. The function is called from verify_check_this_host() via
3026 match_check_list(), which is why most of its arguments are in a single block.
3027
3028 Arguments:
3029 arg the argument block (see below)
3030 ss the host-list item
3031 valueptr where to pass back looked up data, or NULL
3032 error for error message when returning ERROR
3033
3034 The block contains:
3035 host_name (a) the host name, or
3036 (b) NULL, implying use sender_host_name and
3037 sender_host_aliases, looking them up if required, or
3038 (c) the empty string, meaning that only IP address matches
3039 are permitted
3040 host_address the host address
3041 host_ipv4 the IPv4 address taken from an IPv6 one
3042
3043 Returns: OK matched
3044 FAIL did not match
3045 DEFER lookup deferred
3046 ERROR (a) failed to find the host name or IP address, or
3047 (b) unknown lookup type specified, or
3048 (c) host name encountered when only IP addresses are
3049 being matched
3050 */
3051
3052 int
3053 check_host(void *arg, const uschar *ss, const uschar **valueptr, uschar **error)
3054 {
3055 check_host_block *cb = (check_host_block *)arg;
3056 int mlen = -1;
3057 int maskoffset;
3058 BOOL iplookup = FALSE;
3059 BOOL isquery = FALSE;
3060 BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0;
3061 const uschar *t;
3062 uschar *semicolon;
3063 uschar **aliases;
3064
3065 /* Optimize for the special case when the pattern is "*". */
3066
3067 if (*ss == '*' && ss[1] == 0) return OK;
3068
3069 /* If the pattern is empty, it matches only in the case when there is no host -
3070 this can occur in ACL checking for SMTP input using the -bs option. In this
3071 situation, the host address is the empty string. */
3072
3073 if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL;
3074 if (*ss == 0) return FAIL;
3075
3076 /* If the pattern is precisely "@" then match against the primary host name,
3077 provided that host name matching is permitted; if it's "@[]" match against the
3078 local host's IP addresses. */
3079
3080 if (*ss == '@')
3081 {
3082 if (ss[1] == 0)
3083 {
3084 if (isiponly) return ERROR;
3085 ss = primary_hostname;
3086 }
3087 else if (Ustrcmp(ss, "@[]") == 0)
3088 {
3089 ip_address_item *ip;
3090 for (ip = host_find_interfaces(); ip != NULL; ip = ip->next)
3091 if (Ustrcmp(ip->address, cb->host_address) == 0) return OK;
3092 return FAIL;
3093 }
3094 }
3095
3096 /* If the pattern is an IP address, optionally followed by a bitmask count, do
3097 a (possibly masked) comparision with the current IP address. */
3098
3099 if (string_is_ip_address(ss, &maskoffset) != 0)
3100 return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL);
3101
3102 /* The pattern is not an IP address. A common error that people make is to omit
3103 one component of an IPv4 address, either by accident, or believing that, for
3104 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,
3105 which it isn't. (Those applications that do accept 1.2.3 as an IP address
3106 interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an
3107 ancient specification.) To aid in debugging these cases, we give a specific
3108 error if the pattern contains only digits and dots or contains a slash preceded
3109 only by digits and dots (a slash at the start indicates a file name and of
3110 course slashes may be present in lookups, but not preceded only by digits and
3111 dots). */
3112
3113 for (t = ss; isdigit(*t) || *t == '.'; t++);
3114 if (*t == 0 || (*t == '/' && t != ss))
3115 {
3116 *error = US"malformed IPv4 address or address mask";
3117 return ERROR;
3118 }
3119
3120 /* See if there is a semicolon in the pattern */
3121
3122 semicolon = Ustrchr(ss, ';');
3123
3124 /* If we are doing an IP address only match, then all lookups must be IP
3125 address lookups, even if there is no "net-". */
3126
3127 if (isiponly)
3128 {
3129 iplookup = semicolon != NULL;
3130 }
3131
3132 /* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is
3133 a lookup on a masked IP network, in textual form. We obey this code even if we
3134 have already set iplookup, so as to skip over the "net-" prefix and to set the
3135 mask length. The net- stuff really only applies to single-key lookups where the
3136 key is implicit. For query-style lookups the key is specified in the query.
3137 From release 4.30, the use of net- for query style is no longer needed, but we
3138 retain it for backward compatibility. */
3139
3140 if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL)
3141 {
3142 mlen = 0;
3143 for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0';
3144 if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */
3145 iplookup = (*t++ == '-');
3146 }
3147 else t = ss;
3148
3149 /* Do the IP address lookup if that is indeed what we have */
3150
3151 if (iplookup)
3152 {
3153 int insize;
3154 int search_type;
3155 int incoming[4];
3156 void *handle;
3157 uschar *filename, *key, *result;
3158 uschar buffer[64];
3159
3160 /* Find the search type */
3161
3162 search_type = search_findtype(t, semicolon - t);
3163
3164 if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
3165 search_error_message);
3166
3167 /* Adjust parameters for the type of lookup. For a query-style lookup, there
3168 is no file name, and the "key" is just the query. For query-style with a file
3169 name, we have to fish the file off the start of the query. For a single-key
3170 lookup, the key is the current IP address, masked appropriately, and
3171 reconverted to text form, with the mask appended. For IPv6 addresses, specify
3172 dot separators instead of colons, except when the lookup type is "iplsearch".
3173 */
3174
3175 if (mac_islookup(search_type, lookup_absfilequery))
3176 {
3177 filename = semicolon + 1;
3178 key = filename;
3179 while (*key != 0 && !isspace(*key)) key++;
3180 filename = string_copyn(filename, key - filename);
3181 while (isspace(*key)) key++;
3182 }
3183 else if (mac_islookup(search_type, lookup_querystyle))
3184 {
3185 filename = NULL;
3186 key = semicolon + 1;
3187 }
3188 else /* Single-key style */
3189 {
3190 int sep = (Ustrcmp(lookup_list[search_type]->name, "iplsearch") == 0)?
3191 ':' : '.';
3192 insize = host_aton(cb->host_address, incoming);
3193 host_mask(insize, incoming, mlen);
3194 (void)host_nmtoa(insize, incoming, mlen, buffer, sep);
3195 key = buffer;
3196 filename = semicolon + 1;
3197 }
3198
3199 /* Now do the actual lookup; note that there is no search_close() because
3200 of the caching arrangements. */
3201
3202 if (!(handle = search_open(filename, search_type, 0, NULL, NULL)))
3203 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", search_error_message);
3204
3205 result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL);
3206 if (valueptr != NULL) *valueptr = result;
3207 return (result != NULL)? OK : search_find_defer? DEFER: FAIL;
3208 }
3209
3210 /* The pattern is not an IP address or network reference of any kind. That is,
3211 it is a host name pattern. If this is an IP only match, there's an error in the
3212 host list. */
3213
3214 if (isiponly)
3215 {
3216 *error = US"cannot match host name in match_ip list";
3217 return ERROR;
3218 }
3219
3220 /* Check the characters of the pattern to see if they comprise only letters,
3221 digits, full stops, and hyphens (the constituents of domain names). Allow
3222 underscores, as they are all too commonly found. Sigh. Also, if
3223 allow_utf8_domains is set, allow top-bit characters. */
3224
3225 for (t = ss; *t != 0; t++)
3226 if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' &&
3227 (!allow_utf8_domains || *t < 128)) break;
3228
3229 /* If the pattern is a complete domain name, with no fancy characters, look up
3230 its IP address and match against that. Note that a multi-homed host will add
3231 items to the chain. */
3232
3233 if (*t == 0)
3234 {
3235 int rc;
3236 host_item h;
3237 h.next = NULL;
3238 h.name = ss;
3239 h.address = NULL;
3240 h.mx = MX_NONE;
3241
3242 /* Using byname rather than bydns here means we cannot determine dnssec
3243 status. On the other hand it is unclear how that could be either
3244 propagated up or enforced. */
3245
3246 rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE);
3247 if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
3248 {
3249 host_item *hh;
3250 for (hh = &h; hh != NULL; hh = hh->next)
3251 {
3252 if (host_is_in_net(hh->address, cb->host_address, 0)) return OK;
3253 }
3254 return FAIL;
3255 }
3256 if (rc == HOST_FIND_AGAIN) return DEFER;
3257 *error = string_sprintf("failed to find IP address for %s", ss);
3258 return ERROR;
3259 }
3260
3261 /* Almost all subsequent comparisons require the host name, and can be done
3262 using the general string matching function. When this function is called for
3263 outgoing hosts, the name is always given explicitly. If it is NULL, it means we
3264 must use sender_host_name and its aliases, looking them up if necessary. */
3265
3266 if (cb->host_name != NULL) /* Explicit host name given */
3267 return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE,
3268 valueptr);
3269
3270 /* Host name not given; in principle we need the sender host name and its
3271 aliases. However, for query-style lookups, we do not need the name if the
3272 query does not contain $sender_host_name. From release 4.23, a reference to
3273 $sender_host_name causes it to be looked up, so we don't need to do the lookup
3274 on spec. */
3275
3276 if ((semicolon = Ustrchr(ss, ';')) != NULL)
3277 {
3278 const uschar *affix;
3279 int partial, affixlen, starflags, id;
3280
3281 *semicolon = 0;
3282 id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags);
3283 *semicolon=';';
3284
3285 if (id < 0) /* Unknown lookup type */
3286 {
3287 log_write(0, LOG_MAIN|LOG_PANIC, "%s in host list item \"%s\"",
3288 search_error_message, ss);
3289 return DEFER;
3290 }
3291 isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery);
3292 }
3293
3294 if (isquery)
3295 {
3296 switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr))
3297 {
3298 case OK: return OK;
3299 case DEFER: return DEFER;
3300 default: return FAIL;
3301 }
3302 }
3303
3304 /* Not a query-style lookup; must ensure the host name is present, and then we
3305 do a check on the name and all its aliases. */
3306
3307 if (sender_host_name == NULL)
3308 {
3309 HDEBUG(D_host_lookup)
3310 debug_printf("sender host name required, to match against %s\n", ss);
3311 if (host_lookup_failed || host_name_lookup() != OK)
3312 {
3313 *error = string_sprintf("failed to find host name for %s",
3314 sender_host_address);;
3315 return ERROR;
3316 }
3317 host_build_sender_fullhost();
3318 }
3319
3320 /* Match on the sender host name, using the general matching function */
3321
3322 switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE,
3323 valueptr))
3324 {
3325 case OK: return OK;
3326 case DEFER: return DEFER;
3327 }
3328
3329 /* If there are aliases, try matching on them. */
3330
3331 aliases = sender_host_aliases;
3332 while (*aliases != NULL)
3333 {
3334 switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr))
3335 {
3336 case OK: return OK;
3337 case DEFER: return DEFER;
3338 }
3339 }
3340 return FAIL;
3341 }
3342
3343
3344
3345
3346 /*************************************************
3347 * Check a specific host matches a host list *
3348 *************************************************/
3349
3350 /* This function is passed a host list containing items in a number of
3351 different formats and the identity of a host. Its job is to determine whether
3352 the given host is in the set of hosts defined by the list. The host name is
3353 passed as a pointer so that it can be looked up if needed and not already
3354 known. This is commonly the case when called from verify_check_host() to check
3355 an incoming connection. When called from elsewhere the host name should usually
3356 be set.
3357
3358 This function is now just a front end to match_check_list(), which runs common
3359 code for scanning a list. We pass it the check_host() function to perform a
3360 single test.
3361
3362 Arguments:
3363 listptr pointer to the host list
3364 cache_bits pointer to cache for named lists, or NULL
3365 host_name the host name or NULL, implying use sender_host_name and
3366 sender_host_aliases, looking them up if required
3367 host_address the IP address
3368 valueptr if not NULL, data from a lookup is passed back here
3369
3370 Returns: OK if the host is in the defined set
3371 FAIL if the host is not in the defined set,
3372 DEFER if a data lookup deferred (not a host lookup)
3373
3374 If the host name was needed in order to make a comparison, and could not be
3375 determined from the IP address, the result is FAIL unless the item
3376 "+allow_unknown" was met earlier in the list, in which case OK is returned. */
3377
3378 int
3379 verify_check_this_host(const uschar **listptr, unsigned int *cache_bits,
3380 const uschar *host_name, const uschar *host_address, const uschar **valueptr)
3381 {
3382 int rc;
3383 unsigned int *local_cache_bits = cache_bits;
3384 const uschar *save_host_address = deliver_host_address;
3385 check_host_block cb;
3386 cb.host_name = host_name;
3387 cb.host_address = host_address;
3388
3389 if (valueptr != NULL) *valueptr = NULL;
3390
3391 /* If the host address starts off ::ffff: it is an IPv6 address in
3392 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
3393 addresses. */
3394
3395 cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)?
3396 host_address + 7 : host_address;
3397
3398 /* During the running of the check, put the IP address into $host_address. In
3399 the case of calls from the smtp transport, it will already be there. However,
3400 in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
3401 the safe side, any existing setting is preserved, though as I write this
3402 (November 2004) I can't see any cases where it is actually needed. */
3403
3404 deliver_host_address = host_address;
3405 rc = match_check_list(
3406 listptr, /* the list */
3407 0, /* separator character */
3408 &hostlist_anchor, /* anchor pointer */
3409 &local_cache_bits, /* cache pointer */
3410 check_host, /* function for testing */
3411 &cb, /* argument for function */
3412 MCL_HOST, /* type of check */
3413 (host_address == sender_host_address)?
3414 US"host" : host_address, /* text for debugging */
3415 valueptr); /* where to pass back data */
3416 deliver_host_address = save_host_address;
3417 return rc;
3418 }
3419
3420
3421
3422
3423 /*************************************************
3424 * Check the given host item matches a list *
3425 *************************************************/
3426 int
3427 verify_check_given_host(uschar **listptr, host_item *host)
3428 {
3429 return verify_check_this_host(CUSS listptr, NULL, host->name, host->address, NULL);
3430 }
3431
3432 /*************************************************
3433 * Check the remote host matches a list *
3434 *************************************************/
3435
3436 /* This is a front end to verify_check_this_host(), created because checking
3437 the remote host is a common occurrence. With luck, a good compiler will spot
3438 the tail recursion and optimize it. If there's no host address, this is
3439 command-line SMTP input - check against an empty string for the address.
3440
3441 Arguments:
3442 listptr pointer to the host list
3443
3444 Returns: the yield of verify_check_this_host(),
3445 i.e. OK, FAIL, or DEFER
3446 */
3447
3448 int
3449 verify_check_host(uschar **listptr)
3450 {
3451 return verify_check_this_host(CUSS listptr, sender_host_cache, NULL,