Cutthrough: option to reflect 4xx errors from target to initiator
[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)
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)
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)
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)
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 && !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 && !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)
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)
663 {
664 uschar * s = expand_string(tf->helo_data);
665 if (!s)
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 smtp_peer_options |= 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("not usable for cutthrough");
1303 if (send_quit)
1304 (void) smtp_write_command(&outblock, FALSE, "QUIT\r\n");
1305
1306 #ifdef SUPPORT_TLS
1307 tls_close(FALSE, TRUE);
1308 #endif
1309 (void)close(inblock.sock);
1310 #ifndef DISABLE_EVENT
1311 (void) event_raise(addr->transport->event_action, US"tcp:close", NULL);
1312 #endif
1313 }
1314
1315 } /* Loop through all hosts, while !done */
1316 }
1317
1318 /* If we get here with done == TRUE, a successful callout happened, and yield
1319 will be set OK or FAIL according to the response to the RCPT command.
1320 Otherwise, we looped through the hosts but couldn't complete the business.
1321 However, there may be domain-specific information to cache in both cases.
1322
1323 The value of the result field in the new_domain record is ccache_unknown if
1324 there was an error before or with MAIL FROM:, and errno was not zero,
1325 implying some kind of I/O error. We don't want to write the cache in that case.
1326 Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
1327
1328 if ( !(options & vopt_callout_no_cache)
1329 && new_domain_record.result != ccache_unknown)
1330 {
1331 if ((dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE))
1332 == NULL)
1333 {
1334 HDEBUG(D_verify) debug_printf("callout cache: not available\n");
1335 }
1336 else
1337 {
1338 (void)dbfn_write(dbm_file, addr->domain, &new_domain_record,
1339 (int)sizeof(dbdata_callout_cache));
1340 HDEBUG(D_verify) debug_printf("wrote callout cache domain record for %s:\n"
1341 " result=%d postmaster=%d random=%d\n",
1342 addr->domain,
1343 new_domain_record.result,
1344 new_domain_record.postmaster_result,
1345 new_domain_record.random_result);
1346 }
1347 }
1348
1349 /* If a definite result was obtained for the callout, cache it unless caching
1350 is disabled. */
1351
1352 if (done)
1353 {
1354 if ( !(options & vopt_callout_no_cache)
1355 && new_address_record.result != ccache_unknown)
1356 {
1357 if (!dbm_file)
1358 dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE);
1359 if (!dbm_file)
1360 {
1361 HDEBUG(D_verify) debug_printf("no callout cache available\n");
1362 }
1363 else
1364 {
1365 (void)dbfn_write(dbm_file, address_key, &new_address_record,
1366 (int)sizeof(dbdata_callout_cache_address));
1367 HDEBUG(D_verify) debug_printf("wrote %s callout cache address record for %s\n",
1368 new_address_record.result == ccache_accept ? "positive" : "negative",
1369 address_key);
1370 }
1371 }
1372 } /* done */
1373
1374 /* Failure to connect to any host, or any response other than 2xx or 5xx is a
1375 temporary error. If there was only one host, and a response was received, leave
1376 it alone if supplying details. Otherwise, give a generic response. */
1377
1378 else /* !done */
1379 {
1380 uschar * dullmsg = string_sprintf("Could not complete %s verify callout",
1381 options & vopt_is_recipient ? "recipient" : "sender");
1382 yield = DEFER;
1383
1384 if (host_list->next || !addr->message)
1385 addr->message = dullmsg;
1386
1387 addr->user_message = smtp_return_error_details
1388 ? string_sprintf("%s for <%s>.\n"
1389 "The mail server(s) for the domain may be temporarily unreachable, or\n"
1390 "they may be permanently unreachable from this server. In the latter case,\n%s",
1391 dullmsg, addr->address,
1392 options & vopt_is_recipient
1393 ? "the address will never be accepted."
1394 : "you need to change the address or create an MX record for its domain\n"
1395 "if it is supposed to be generally accessible from the Internet.\n"
1396 "Talk to your mail administrator for details.")
1397 : dullmsg;
1398
1399 /* Force a specific error code */
1400
1401 addr->basic_errno = ERRNO_CALLOUTDEFER;
1402 }
1403
1404 /* Come here from within the cache-reading code on fast-track exit. */
1405
1406 END_CALLOUT:
1407 if (dbm_file) dbfn_close(dbm_file);
1408 return yield;
1409 }
1410
1411
1412
1413 /* Called after recipient-acl to get a cutthrough connection open when
1414 one was requested and a recipient-verify wasn't subsequently done.
1415 */
1416 int
1417 open_cutthrough_connection( address_item * addr )
1418 {
1419 address_item addr2;
1420 int rc;
1421
1422 /* Use a recipient-verify-callout to set up the cutthrough connection. */
1423 /* We must use a copy of the address for verification, because it might
1424 get rewritten. */
1425
1426 addr2 = *addr;
1427 HDEBUG(D_acl) debug_printf("----------- %s cutthrough setup ------------\n",
1428 rcpt_count > 1 ? "more" : "start");
1429 rc = verify_address(&addr2, NULL,
1430 vopt_is_recipient | vopt_callout_recipsender | vopt_callout_no_cache,
1431 CUTTHROUGH_CMD_TIMEOUT, -1, -1,
1432 NULL, NULL, NULL);
1433 addr->message = addr2.message;
1434 addr->user_message = addr2.user_message;
1435 HDEBUG(D_acl) debug_printf("----------- end cutthrough setup ------------\n");
1436 return rc;
1437 }
1438
1439
1440
1441 /* Send given number of bytes from the buffer */
1442 static BOOL
1443 cutthrough_send(int n)
1444 {
1445 if(cutthrough.fd < 0)
1446 return TRUE;
1447
1448 if(
1449 #ifdef SUPPORT_TLS
1450 (tls_out.active == cutthrough.fd) ? tls_write(FALSE, ctblock.buffer, n) :
1451 #endif
1452 send(cutthrough.fd, ctblock.buffer, n, 0) > 0
1453 )
1454 {
1455 transport_count += n;
1456 ctblock.ptr= ctblock.buffer;
1457 return TRUE;
1458 }
1459
1460 HDEBUG(D_transport|D_acl) debug_printf("cutthrough_send failed: %s\n", strerror(errno));
1461 return FALSE;
1462 }
1463
1464
1465
1466 static BOOL
1467 _cutthrough_puts(uschar * cp, int n)
1468 {
1469 while(n--)
1470 {
1471 if(ctblock.ptr >= ctblock.buffer+ctblock.buffersize)
1472 if(!cutthrough_send(ctblock.buffersize))
1473 return FALSE;
1474
1475 *ctblock.ptr++ = *cp++;
1476 }
1477 return TRUE;
1478 }
1479
1480 /* Buffered output of counted data block. Return boolean success */
1481 BOOL
1482 cutthrough_puts(uschar * cp, int n)
1483 {
1484 if (cutthrough.fd < 0) return TRUE;
1485 if (_cutthrough_puts(cp, n)) return TRUE;
1486 cancel_cutthrough_connection("transmit failed");
1487 return FALSE;
1488 }
1489
1490
1491 static BOOL
1492 _cutthrough_flush_send(void)
1493 {
1494 int n= ctblock.ptr-ctblock.buffer;
1495
1496 if(n>0)
1497 if(!cutthrough_send(n))
1498 return FALSE;
1499 return TRUE;
1500 }
1501
1502
1503 /* Send out any bufferred output. Return boolean success. */
1504 BOOL
1505 cutthrough_flush_send(void)
1506 {
1507 if (_cutthrough_flush_send()) return TRUE;
1508 cancel_cutthrough_connection("transmit failed");
1509 return FALSE;
1510 }
1511
1512
1513 BOOL
1514 cutthrough_put_nl(void)
1515 {
1516 return cutthrough_puts(US"\r\n", 2);
1517 }
1518
1519
1520 /* Get and check response from cutthrough target */
1521 static uschar
1522 cutthrough_response(char expect, uschar ** copy)
1523 {
1524 smtp_inblock inblock;
1525 uschar inbuffer[4096];
1526 uschar responsebuffer[4096];
1527
1528 inblock.buffer = inbuffer;
1529 inblock.buffersize = sizeof(inbuffer);
1530 inblock.ptr = inbuffer;
1531 inblock.ptrend = inbuffer;
1532 inblock.sock = cutthrough.fd;
1533 /* this relies on (inblock.sock == tls_out.active) */
1534 if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, CUTTHROUGH_DATA_TIMEOUT))
1535 cancel_cutthrough_connection("target timeout on read");
1536
1537 if(copy != NULL)
1538 {
1539 uschar * cp;
1540 *copy = cp = string_copy(responsebuffer);
1541 /* Trim the trailing end of line */
1542 cp += Ustrlen(responsebuffer);
1543 if(cp > *copy && cp[-1] == '\n') *--cp = '\0';
1544 if(cp > *copy && cp[-1] == '\r') *--cp = '\0';
1545 }
1546
1547 return responsebuffer[0];
1548 }
1549
1550
1551 /* Negotiate dataphase with the cutthrough target, returning success boolean */
1552 BOOL
1553 cutthrough_predata(void)
1554 {
1555 if(cutthrough.fd < 0)
1556 return FALSE;
1557
1558 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> DATA\n");
1559 cutthrough_puts(US"DATA\r\n", 6);
1560 cutthrough_flush_send();
1561
1562 /* Assume nothing buffered. If it was it gets ignored. */
1563 return cutthrough_response('3', NULL) == '3';
1564 }
1565
1566
1567 /* fd and tctx args only to match write_chunk() */
1568 static BOOL
1569 cutthrough_write_chunk(int fd, transport_ctx * tctx, uschar * s, int len)
1570 {
1571 uschar * s2;
1572 while(s && (s2 = Ustrchr(s, '\n')))
1573 {
1574 if(!cutthrough_puts(s, s2-s) || !cutthrough_put_nl())
1575 return FALSE;
1576 s = s2+1;
1577 }
1578 return TRUE;
1579 }
1580
1581
1582 /* Buffered send of headers. Return success boolean. */
1583 /* Expands newlines to wire format (CR,NL). */
1584 /* Also sends header-terminating blank line. */
1585 BOOL
1586 cutthrough_headers_send(void)
1587 {
1588 transport_ctx tctx;
1589
1590 if(cutthrough.fd < 0)
1591 return FALSE;
1592
1593 /* We share a routine with the mainline transport to handle header add/remove/rewrites,
1594 but having a separate buffered-output function (for now)
1595 */
1596 HDEBUG(D_acl) debug_printf("----------- start cutthrough headers send -----------\n");
1597
1598 tctx.tblock = cutthrough.addr.transport;
1599 tctx.addr = &cutthrough.addr;
1600 tctx.check_string = US".";
1601 tctx.escape_string = US"..";
1602 tctx.options = topt_use_crlf;
1603
1604 if (!transport_headers_send(cutthrough.fd, &tctx, &cutthrough_write_chunk))
1605 return FALSE;
1606
1607 HDEBUG(D_acl) debug_printf("----------- done cutthrough headers send ------------\n");
1608 return TRUE;
1609 }
1610
1611
1612 static void
1613 close_cutthrough_connection(const char * why)
1614 {
1615 if(cutthrough.fd >= 0)
1616 {
1617 /* We could be sending this after a bunch of data, but that is ok as
1618 the only way to cancel the transfer in dataphase is to drop the tcp
1619 conn before the final dot.
1620 */
1621 ctblock.ptr = ctbuffer;
1622 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> QUIT\n");
1623 _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */
1624 _cutthrough_flush_send();
1625 /* No wait for response */
1626
1627 #ifdef SUPPORT_TLS
1628 tls_close(FALSE, TRUE);
1629 #endif
1630 (void)close(cutthrough.fd);
1631 cutthrough.fd = -1;
1632 HDEBUG(D_acl) debug_printf("----------- cutthrough shutdown (%s) ------------\n", why);
1633 }
1634 ctblock.ptr = ctbuffer;
1635 }
1636
1637 void
1638 cancel_cutthrough_connection(const char * why)
1639 {
1640 close_cutthrough_connection(why);
1641 cutthrough.delivery = FALSE;
1642 }
1643
1644
1645
1646
1647 /* Have senders final-dot. Send one to cutthrough target, and grab the response.
1648 Log an OK response as a transmission.
1649 Close the connection.
1650 Return smtp response-class digit.
1651 */
1652 uschar *
1653 cutthrough_finaldot(void)
1654 {
1655 uschar res;
1656 address_item * addr;
1657 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> .\n");
1658
1659 /* Assume data finshed with new-line */
1660 if( !cutthrough_puts(US".", 1)
1661 || !cutthrough_put_nl()
1662 || !cutthrough_flush_send()
1663 )
1664 return cutthrough.addr.message;
1665
1666 res = cutthrough_response('2', &cutthrough.addr.message);
1667 for (addr = &cutthrough.addr; addr; addr = addr->next)
1668 {
1669 addr->message = cutthrough.addr.message;
1670 switch(res)
1671 {
1672 case '2':
1673 delivery_log(LOG_MAIN, addr, (int)'>', NULL);
1674 close_cutthrough_connection("delivered");
1675 break;
1676
1677 case '4':
1678 delivery_log(LOG_MAIN, addr, 0,
1679 US"tmp-reject from cutthrough after DATA:");
1680 break;
1681
1682 case '5':
1683 delivery_log(LOG_MAIN|LOG_REJECT, addr, 0,
1684 US"rejected after DATA:");
1685 break;
1686
1687 default:
1688 break;
1689 }
1690 }
1691 return cutthrough.addr.message;
1692 }
1693
1694
1695
1696 /*************************************************
1697 * Copy error to toplevel address *
1698 *************************************************/
1699
1700 /* This function is used when a verify fails or defers, to ensure that the
1701 failure or defer information is in the original toplevel address. This applies
1702 when an address is redirected to a single new address, and the failure or
1703 deferral happens to the child address.
1704
1705 Arguments:
1706 vaddr the verify address item
1707 addr the final address item
1708 yield FAIL or DEFER
1709
1710 Returns: the value of YIELD
1711 */
1712
1713 static int
1714 copy_error(address_item *vaddr, address_item *addr, int yield)
1715 {
1716 if (addr != vaddr)
1717 {
1718 vaddr->message = addr->message;
1719 vaddr->user_message = addr->user_message;
1720 vaddr->basic_errno = addr->basic_errno;
1721 vaddr->more_errno = addr->more_errno;
1722 vaddr->prop.address_data = addr->prop.address_data;
1723 copyflag(vaddr, addr, af_pass_message);
1724 }
1725 return yield;
1726 }
1727
1728
1729
1730
1731 /**************************************************
1732 * printf that automatically handles TLS if needed *
1733 ***************************************************/
1734
1735 /* This function is used by verify_address() as a substitute for all fprintf()
1736 calls; a direct fprintf() will not produce output in a TLS SMTP session, such
1737 as a response to an EXPN command. smtp_in.c makes smtp_printf available but
1738 that assumes that we always use the smtp_out FILE* when not using TLS or the
1739 ssl buffer when we are. Instead we take a FILE* parameter and check to see if
1740 that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular
1741 fprintf().
1742
1743 Arguments:
1744 f the candidate FILE* to write to
1745 format format string
1746 ... optional arguments
1747
1748 Returns:
1749 nothing
1750 */
1751
1752 static void PRINTF_FUNCTION(2,3)
1753 respond_printf(FILE *f, const char *format, ...)
1754 {
1755 va_list ap;
1756
1757 va_start(ap, format);
1758 if (smtp_out && (f == smtp_out))
1759 smtp_vprintf(format, ap);
1760 else
1761 vfprintf(f, format, ap);
1762 va_end(ap);
1763 }
1764
1765
1766
1767 /*************************************************
1768 * Verify an email address *
1769 *************************************************/
1770
1771 /* This function is used both for verification (-bv and at other times) and
1772 address testing (-bt), which is indicated by address_test_mode being set.
1773
1774 Arguments:
1775 vaddr contains the address to verify; the next field in this block
1776 must be NULL
1777 f if not NULL, write the result to this file
1778 options various option bits:
1779 vopt_fake_sender => this sender verify is not for the real
1780 sender (it was verify=sender=xxxx or an address from a
1781 header line) - rewriting must not change sender_address
1782 vopt_is_recipient => this is a recipient address, otherwise
1783 it's a sender address - this affects qualification and
1784 rewriting and messages from callouts
1785 vopt_qualify => qualify an unqualified address; else error
1786 vopt_expn => called from SMTP EXPN command
1787 vopt_success_on_redirect => when a new address is generated
1788 the verification instantly succeeds
1789
1790 These ones are used by do_callout() -- the options variable
1791 is passed to it.
1792
1793 vopt_callout_fullpm => if postmaster check, do full one
1794 vopt_callout_no_cache => don't use callout cache
1795 vopt_callout_random => do the "random" thing
1796 vopt_callout_recipsender => use real sender for recipient
1797 vopt_callout_recippmaster => use postmaster for recipient
1798
1799 callout if > 0, specifies that callout is required, and gives timeout
1800 for individual commands
1801 callout_overall if > 0, gives overall timeout for the callout function;
1802 if < 0, a default is used (see do_callout())
1803 callout_connect the connection timeout for callouts
1804 se_mailfrom when callout is requested to verify a sender, use this
1805 in MAIL FROM; NULL => ""
1806 pm_mailfrom when callout is requested, if non-NULL, do the postmaster
1807 thing and use this as the sender address (may be "")
1808
1809 routed if not NULL, set TRUE if routing succeeded, so we can
1810 distinguish between routing failed and callout failed
1811
1812 Returns: OK address verified
1813 FAIL address failed to verify
1814 DEFER can't tell at present
1815 */
1816
1817 int
1818 verify_address(address_item *vaddr, FILE *f, int options, int callout,
1819 int callout_overall, int callout_connect, uschar *se_mailfrom,
1820 uschar *pm_mailfrom, BOOL *routed)
1821 {
1822 BOOL allok = TRUE;
1823 BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0);
1824 BOOL expn = (options & vopt_expn) != 0;
1825 BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0;
1826 int i;
1827 int yield = OK;
1828 int verify_type = expn? v_expn :
1829 address_test_mode? v_none :
1830 options & vopt_is_recipient? v_recipient : v_sender;
1831 address_item *addr_list;
1832 address_item *addr_new = NULL;
1833 address_item *addr_remote = NULL;
1834 address_item *addr_local = NULL;
1835 address_item *addr_succeed = NULL;
1836 uschar **failure_ptr = options & vopt_is_recipient
1837 ? &recipient_verify_failure : &sender_verify_failure;
1838 uschar *ko_prefix, *cr;
1839 uschar *address = vaddr->address;
1840 uschar *save_sender;
1841 uschar null_sender[] = { 0 }; /* Ensure writeable memory */
1842
1843 /* Clear, just in case */
1844
1845 *failure_ptr = NULL;
1846
1847 /* Set up a prefix and suffix for error message which allow us to use the same
1848 output statements both in EXPN mode (where an SMTP response is needed) and when
1849 debugging with an output file. */
1850
1851 if (expn)
1852 {
1853 ko_prefix = US"553 ";
1854 cr = US"\r";
1855 }
1856 else ko_prefix = cr = US"";
1857
1858 /* Add qualify domain if permitted; otherwise an unqualified address fails. */
1859
1860 if (parse_find_at(address) == NULL)
1861 {
1862 if ((options & vopt_qualify) == 0)
1863 {
1864 if (f != NULL)
1865 respond_printf(f, "%sA domain is required for \"%s\"%s\n",
1866 ko_prefix, address, cr);
1867 *failure_ptr = US"qualify";
1868 return FAIL;
1869 }
1870 address = rewrite_address_qualify(address, options & vopt_is_recipient);
1871 }
1872
1873 DEBUG(D_verify)
1874 {
1875 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1876 debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address);
1877 }
1878
1879 /* Rewrite and report on it. Clear the domain and local part caches - these
1880 may have been set by domains and local part tests during an ACL. */
1881
1882 if (global_rewrite_rules != NULL)
1883 {
1884 uschar *old = address;
1885 address = rewrite_address(address, options & vopt_is_recipient, FALSE,
1886 global_rewrite_rules, rewrite_existflags);
1887 if (address != old)
1888 {
1889 for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0;
1890 for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0;
1891 if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address);
1892 }
1893 }
1894
1895 /* If this is the real sender address, we must update sender_address at
1896 this point, because it may be referred to in the routers. */
1897
1898 if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0)
1899 sender_address = address;
1900
1901 /* If the address was rewritten to <> no verification can be done, and we have
1902 to return OK. This rewriting is permitted only for sender addresses; for other
1903 addresses, such rewriting fails. */
1904
1905 if (address[0] == 0) return OK;
1906
1907 /* Flip the legacy TLS-related variables over to the outbound set in case
1908 they're used in the context of a transport used by verification. Reset them
1909 at exit from this routine (so no returns allowed from here on). */
1910
1911 tls_modify_variables(&tls_out);
1912
1913 /* Save a copy of the sender address for re-instating if we change it to <>
1914 while verifying a sender address (a nice bit of self-reference there). */
1915
1916 save_sender = sender_address;
1917
1918 /* Observability variable for router/transport use */
1919
1920 verify_mode = options & vopt_is_recipient ? US"R" : US"S";
1921
1922 /* Update the address structure with the possibly qualified and rewritten
1923 address. Set it up as the starting address on the chain of new addresses. */
1924
1925 vaddr->address = address;
1926 addr_new = vaddr;
1927
1928 /* We need a loop, because an address can generate new addresses. We must also
1929 cope with generated pipes and files at the top level. (See also the code and
1930 comment in deliver.c.) However, it is usually the case that the router for
1931 user's .forward files has its verify flag turned off.
1932
1933 If an address generates more than one child, the loop is used only when
1934 full_info is set, and this can only be set locally. Remote enquiries just get
1935 information about the top level address, not anything that it generated. */
1936
1937 while (addr_new)
1938 {
1939 int rc;
1940 address_item *addr = addr_new;
1941
1942 addr_new = addr->next;
1943 addr->next = NULL;
1944
1945 DEBUG(D_verify)
1946 {
1947 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1948 debug_printf("Considering %s\n", addr->address);
1949 }
1950
1951 /* Handle generated pipe, file or reply addresses. We don't get these
1952 when handling EXPN, as it does only one level of expansion. */
1953
1954 if (testflag(addr, af_pfr))
1955 {
1956 allok = FALSE;
1957 if (f != NULL)
1958 {
1959 BOOL allow;
1960
1961 if (addr->address[0] == '>')
1962 {
1963 allow = testflag(addr, af_allow_reply);
1964 fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1);
1965 }
1966 else
1967 {
1968 allow = (addr->address[0] == '|')?
1969 testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file);
1970 fprintf(f, "%s -> %s", addr->parent->address, addr->address);
1971 }
1972
1973 if (addr->basic_errno == ERRNO_BADTRANSPORT)
1974 fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n"
1975 "%s\n", addr->message);
1976 else if (allow)
1977 fprintf(f, "\n transport = %s\n", addr->transport->name);
1978 else
1979 fprintf(f, " *** forbidden ***\n");
1980 }
1981 continue;
1982 }
1983
1984 /* Just in case some router parameter refers to it. */
1985
1986 return_path = addr->prop.errors_address
1987 ? addr->prop.errors_address : sender_address;
1988
1989 /* Split the address into domain and local part, handling the %-hack if
1990 necessary, and then route it. While routing a sender address, set
1991 $sender_address to <> because that is what it will be if we were trying to
1992 send a bounce to the sender. */
1993
1994 if (routed) *routed = FALSE;
1995 if ((rc = deliver_split_address(addr)) == OK)
1996 {
1997 if (!(options & vopt_is_recipient)) sender_address = null_sender;
1998 rc = route_address(addr, &addr_local, &addr_remote, &addr_new,
1999 &addr_succeed, verify_type);
2000 sender_address = save_sender; /* Put back the real sender */
2001 }
2002
2003 /* If routing an address succeeded, set the flag that remembers, for use when
2004 an ACL cached a sender verify (in case a callout fails). Then if routing set
2005 up a list of hosts or the transport has a host list, and the callout option
2006 is set, and we aren't in a host checking run, do the callout verification,
2007 and set another flag that notes that a callout happened. */
2008
2009 if (rc == OK)
2010 {
2011 if (routed) *routed = TRUE;
2012 if (callout > 0)
2013 {
2014 transport_instance * tp;
2015 host_item * host_list = addr->host_list;
2016
2017 /* Make up some data for use in the case where there is no remote
2018 transport. */
2019
2020 transport_feedback tf = {
2021 NULL, /* interface (=> any) */
2022 US"smtp", /* port */
2023 US"smtp", /* protocol */
2024 NULL, /* hosts */
2025 US"$smtp_active_hostname", /* helo_data */
2026 FALSE, /* hosts_override */
2027 FALSE, /* hosts_randomize */
2028 FALSE, /* gethostbyname */
2029 TRUE, /* qualify_single */
2030 FALSE /* search_parents */
2031 };
2032
2033 /* If verification yielded a remote transport, we want to use that
2034 transport's options, so as to mimic what would happen if we were really
2035 sending a message to this address. */
2036
2037 if ((tp = addr->transport) && !tp->info->local)
2038 {
2039 (void)(tp->setup)(tp, addr, &tf, 0, 0, NULL);
2040
2041 /* If the transport has hosts and the router does not, or if the
2042 transport is configured to override the router's hosts, we must build a
2043 host list of the transport's hosts, and find the IP addresses */
2044
2045 if (tf.hosts && (!host_list || tf.hosts_override))
2046 {
2047 uschar *s;
2048 const uschar *save_deliver_domain = deliver_domain;
2049 uschar *save_deliver_localpart = deliver_localpart;
2050
2051 host_list = NULL; /* Ignore the router's hosts */
2052
2053 deliver_domain = addr->domain;
2054 deliver_localpart = addr->local_part;
2055 s = expand_string(tf.hosts);
2056 deliver_domain = save_deliver_domain;
2057 deliver_localpart = save_deliver_localpart;
2058
2059 if (!s)
2060 {
2061 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts "
2062 "\"%s\" in %s transport for callout: %s", tf.hosts,
2063 tp->name, expand_string_message);
2064 }
2065 else
2066 {
2067 int flags;
2068 host_item *host, *nexthost;
2069 host_build_hostlist(&host_list, s, tf.hosts_randomize);
2070
2071 /* Just ignore failures to find a host address. If we don't manage
2072 to find any addresses, the callout will defer. Note that more than
2073 one address may be found for a single host, which will result in
2074 additional host items being inserted into the chain. Hence we must
2075 save the next host first. */
2076
2077 flags = HOST_FIND_BY_A;
2078 if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2079 if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2080
2081 for (host = host_list; host; host = nexthost)
2082 {
2083 nexthost = host->next;
2084 if (tf.gethostbyname ||
2085 string_is_ip_address(host->name, NULL) != 0)
2086 (void)host_find_byname(host, NULL, flags, NULL, TRUE);
2087 else
2088 {
2089 dnssec_domains * dnssec_domains = NULL;
2090 if (Ustrcmp(tp->driver_name, "smtp") == 0)
2091 {
2092 smtp_transport_options_block * ob =
2093 (smtp_transport_options_block *) tp->options_block;
2094 dnssec_domains = &ob->dnssec;
2095 }
2096
2097 (void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2098 dnssec_domains, NULL, NULL);
2099 }
2100 }
2101 }
2102 }
2103 }
2104
2105 /* Can only do a callout if we have at least one host! If the callout
2106 fails, it will have set ${sender,recipient}_verify_failure. */
2107
2108 if (host_list)
2109 {
2110 HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n");
2111 if (host_checking && !host_checking_callout)
2112 {
2113 HDEBUG(D_verify)
2114 debug_printf("... callout omitted by default when host testing\n"
2115 "(Use -bhc if you want the callouts to happen.)\n");
2116 }
2117 else
2118 {
2119 #ifdef SUPPORT_TLS
2120 deliver_set_expansions(addr);
2121 #endif
2122 rc = do_callout(addr, host_list, &tf, callout, callout_overall,
2123 callout_connect, options, se_mailfrom, pm_mailfrom);
2124 }
2125 }
2126 else
2127 {
2128 HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor "
2129 "transport provided a host list\n");
2130 }
2131 }
2132 }
2133
2134 /* Otherwise, any failure is a routing failure */
2135
2136 else *failure_ptr = US"route";
2137
2138 /* A router may return REROUTED if it has set up a child address as a result
2139 of a change of domain name (typically from widening). In this case we always
2140 want to continue to verify the new child. */
2141
2142 if (rc == REROUTED) continue;
2143
2144 /* Handle hard failures */
2145
2146 if (rc == FAIL)
2147 {
2148 allok = FALSE;
2149 if (f)
2150 {
2151 address_item *p = addr->parent;
2152
2153 respond_printf(f, "%s%s %s", ko_prefix,
2154 full_info ? addr->address : address,
2155 address_test_mode ? "is undeliverable" : "failed to verify");
2156 if (!expn && admin_user)
2157 {
2158 if (addr->basic_errno > 0)
2159 respond_printf(f, ": %s", strerror(addr->basic_errno));
2160 if (addr->message)
2161 respond_printf(f, ": %s", addr->message);
2162 }
2163
2164 /* Show parents iff doing full info */
2165
2166 if (full_info) while (p)
2167 {
2168 respond_printf(f, "%s\n <-- %s", cr, p->address);
2169 p = p->parent;
2170 }
2171 respond_printf(f, "%s\n", cr);
2172 }
2173 cancel_cutthrough_connection("routing hard fail");
2174
2175 if (!full_info)
2176 {
2177 yield = copy_error(vaddr, addr, FAIL);
2178 goto out;
2179 }
2180 yield = FAIL;
2181 }
2182
2183 /* Soft failure */
2184
2185 else if (rc == DEFER)
2186 {
2187 allok = FALSE;
2188 if (f)
2189 {
2190 address_item *p = addr->parent;
2191 respond_printf(f, "%s%s cannot be resolved at this time", ko_prefix,
2192 full_info? addr->address : address);
2193 if (!expn && admin_user)
2194 {
2195 if (addr->basic_errno > 0)
2196 respond_printf(f, ": %s", strerror(addr->basic_errno));
2197 if (addr->message)
2198 respond_printf(f, ": %s", addr->message);
2199 else if (addr->basic_errno <= 0)
2200 respond_printf(f, ": unknown error");
2201 }
2202
2203 /* Show parents iff doing full info */
2204
2205 if (full_info) while (p)
2206 {
2207 respond_printf(f, "%s\n <-- %s", cr, p->address);
2208 p = p->parent;
2209 }
2210 respond_printf(f, "%s\n", cr);
2211 }
2212 cancel_cutthrough_connection("routing soft fail");
2213
2214 if (!full_info)
2215 {
2216 yield = copy_error(vaddr, addr, DEFER);
2217 goto out;
2218 }
2219 if (yield == OK) yield = DEFER;
2220 }
2221
2222 /* If we are handling EXPN, we do not want to continue to route beyond
2223 the top level (whose address is in "address"). */
2224
2225 else if (expn)
2226 {
2227 uschar *ok_prefix = US"250-";
2228
2229 if (!addr_new)
2230 if (!addr_local && !addr_remote)
2231 respond_printf(f, "250 mail to <%s> is discarded\r\n", address);
2232 else
2233 respond_printf(f, "250 <%s>\r\n", address);
2234
2235 else do
2236 {
2237 address_item *addr2 = addr_new;
2238 addr_new = addr2->next;
2239 if (!addr_new) ok_prefix = US"250 ";
2240 respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address);
2241 } while (addr_new);
2242 yield = OK;
2243 goto out;
2244 }
2245
2246 /* Successful routing other than EXPN. */
2247
2248 else
2249 {
2250 /* Handle successful routing when short info wanted. Otherwise continue for
2251 other (generated) addresses. Short info is the operational case. Full info
2252 can be requested only when debug_selector != 0 and a file is supplied.
2253
2254 There is a conflict between the use of aliasing as an alternate email
2255 address, and as a sort of mailing list. If an alias turns the incoming
2256 address into just one address (e.g. J.Caesar->jc44) you may well want to
2257 carry on verifying the generated address to ensure it is valid when
2258 checking incoming mail. If aliasing generates multiple addresses, you
2259 probably don't want to do this. Exim therefore treats the generation of
2260 just a single new address as a special case, and continues on to verify the
2261 generated address. */
2262
2263 if ( !full_info /* Stop if short info wanted AND */
2264 && ( ( !addr_new /* No new address OR */
2265 || addr_new->next /* More than one new address OR */
2266 || testflag(addr_new, af_pfr) /* New address is pfr */
2267 )
2268 || /* OR */
2269 ( addr_new /* At least one new address AND */
2270 && success_on_redirect /* success_on_redirect is set */
2271 ) )
2272 )
2273 {
2274 if (f) fprintf(f, "%s %s\n",
2275 address, address_test_mode ? "is deliverable" : "verified");
2276
2277 /* If we have carried on to verify a child address, we want the value
2278 of $address_data to be that of the child */
2279
2280 vaddr->prop.address_data = addr->prop.address_data;
2281
2282 /* If stopped because more than one new address, cannot cutthrough */
2283
2284 if (addr_new && addr_new->next)
2285 cancel_cutthrough_connection("multiple addresses from routing");
2286
2287 yield = OK;
2288 goto out;
2289 }
2290 }
2291 } /* Loop for generated addresses */
2292
2293 /* Display the full results of the successful routing, including any generated
2294 addresses. Control gets here only when full_info is set, which requires f not
2295 to be NULL, and this occurs only when a top-level verify is called with the
2296 debugging switch on.
2297
2298 If there are no local and no remote addresses, and there were no pipes, files,
2299 or autoreplies, and there were no errors or deferments, the message is to be
2300 discarded, usually because of the use of :blackhole: in an alias file. */
2301
2302 if (allok && !addr_local && !addr_remote)
2303 {
2304 fprintf(f, "mail to %s is discarded\n", address);
2305 goto out;
2306 }
2307
2308 for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
2309 while (addr_list)
2310 {
2311 address_item *addr = addr_list;
2312 address_item *p = addr->parent;
2313 transport_instance * tp = addr->transport;
2314
2315 addr_list = addr->next;
2316
2317 fprintf(f, "%s", CS addr->address);
2318 #ifdef EXPERIMENTAL_SRS
2319 if(addr->prop.srs_sender)
2320 fprintf(f, " [srs = %s]", addr->prop.srs_sender);
2321 #endif
2322
2323 /* If the address is a duplicate, show something about it. */
2324
2325 if (!testflag(addr, af_pfr))
2326 {
2327 tree_node *tnode;
2328 if ((tnode = tree_search(tree_duplicates, addr->unique)))
2329 fprintf(f, " [duplicate, would not be delivered]");
2330 else tree_add_duplicate(addr->unique, addr);
2331 }
2332
2333 /* Now show its parents */
2334
2335 for (p = addr->parent; p; p = p->parent)
2336 fprintf(f, "\n <-- %s", p->address);
2337 fprintf(f, "\n ");
2338
2339 /* Show router, and transport */
2340
2341 fprintf(f, "router = %s, transport = %s\n",
2342 addr->router->name, tp ? tp->name : US"unset");
2343
2344 /* Show any hosts that are set up by a router unless the transport
2345 is going to override them; fiddle a bit to get a nice format. */
2346
2347 if (addr->host_list && tp && !tp->overrides_hosts)
2348 {
2349 host_item *h;
2350 int maxlen = 0;
2351 int maxaddlen = 0;
2352 for (h = addr->host_list; h; h = h->next)
2353 { /* get max lengths of host names, addrs */
2354 int len = Ustrlen(h->name);
2355 if (len > maxlen) maxlen = len;
2356 len = h->address ? Ustrlen(h->address) : 7;
2357 if (len > maxaddlen) maxaddlen = len;
2358 }
2359 for (h = addr->host_list; h; h = h->next)
2360 {
2361 fprintf(f, " host %-*s ", maxlen, h->name);
2362
2363 if (h->address)
2364 fprintf(f, "[%s%-*c", h->address, maxaddlen+1 - Ustrlen(h->address), ']');
2365 else if (tp->info->local)
2366 fprintf(f, " %-*s ", maxaddlen, ""); /* Omit [unknown] for local */
2367 else
2368 fprintf(f, "[%s%-*c", "unknown", maxaddlen+1 - 7, ']');
2369
2370 if (h->mx >= 0) fprintf(f, " MX=%d", h->mx);
2371 if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port);
2372 if (running_in_test_harness && h->dnssec == DS_YES) fputs(" AD", f);
2373 if (h->status == hstatus_unusable) fputs(" ** unusable **", f);
2374 fputc('\n', f);
2375 }
2376 }
2377 }
2378
2379 /* Yield will be DEFER or FAIL if any one address has, only for full_info (which is
2380 the -bv or -bt case). */
2381
2382 out:
2383 verify_mode = NULL;
2384 tls_modify_variables(&tls_in);
2385
2386 return yield;
2387 }
2388
2389
2390
2391
2392 /*************************************************
2393 * Check headers for syntax errors *
2394 *************************************************/
2395
2396 /* This function checks those header lines that contain addresses, and verifies
2397 that all the addresses therein are syntactially correct.
2398
2399 Arguments:
2400 msgptr where to put an error message
2401
2402 Returns: OK
2403 FAIL
2404 */
2405
2406 int
2407 verify_check_headers(uschar **msgptr)
2408 {
2409 header_line *h;
2410 uschar *colon, *s;
2411 int yield = OK;
2412
2413 for (h = header_list; h != NULL && yield == OK; h = h->next)
2414 {
2415 if (h->type != htype_from &&
2416 h->type != htype_reply_to &&
2417 h->type != htype_sender &&
2418 h->type != htype_to &&
2419 h->type != htype_cc &&
2420 h->type != htype_bcc)
2421 continue;
2422
2423 colon = Ustrchr(h->text, ':');
2424 s = colon + 1;
2425 while (isspace(*s)) s++;
2426
2427 /* Loop for multiple addresses in the header, enabling group syntax. Note
2428 that we have to reset this after the header has been scanned. */
2429
2430 parse_allow_group = TRUE;
2431
2432 while (*s != 0)
2433 {
2434 uschar *ss = parse_find_address_end(s, FALSE);
2435 uschar *recipient, *errmess;
2436 int terminator = *ss;
2437 int start, end, domain;
2438
2439 /* Temporarily terminate the string at this point, and extract the
2440 operative address within, allowing group syntax. */
2441
2442 *ss = 0;
2443 recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
2444 *ss = terminator;
2445
2446 /* Permit an unqualified address only if the message is local, or if the
2447 sending host is configured to be permitted to send them. */
2448
2449 if (recipient != NULL && domain == 0)
2450 {
2451 if (h->type == htype_from || h->type == htype_sender)
2452 {
2453 if (!allow_unqualified_sender) recipient = NULL;
2454 }
2455 else
2456 {
2457 if (!allow_unqualified_recipient) recipient = NULL;
2458 }
2459 if (recipient == NULL) errmess = US"unqualified address not permitted";
2460 }
2461
2462 /* It's an error if no address could be extracted, except for the special
2463 case of an empty address. */
2464
2465 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2466 {
2467 uschar *verb = US"is";
2468 uschar *t = ss;
2469 uschar *tt = colon;
2470 int len;
2471
2472 /* Arrange not to include any white space at the end in the
2473 error message or the header name. */
2474
2475 while (t > s && isspace(t[-1])) t--;
2476 while (tt > h->text && isspace(tt[-1])) tt--;
2477
2478 /* Add the address that failed to the error message, since in a
2479 header with very many addresses it is sometimes hard to spot
2480 which one is at fault. However, limit the amount of address to
2481 quote - cases have been seen where, for example, a missing double
2482 quote in a humungous To: header creates an "address" that is longer
2483 than string_sprintf can handle. */
2484
2485 len = t - s;
2486 if (len > 1024)
2487 {
2488 len = 1024;
2489 verb = US"begins";
2490 }
2491
2492 /* deconst cast ok as we're passing a non-const to string_printing() */
2493 *msgptr = US string_printing(
2494 string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s",
2495 errmess, tt - h->text, h->text, verb, len, s));
2496
2497 yield = FAIL;
2498 break; /* Out of address loop */
2499 }
2500
2501 /* Advance to the next address */
2502
2503 s = ss + (terminator? 1:0);
2504 while (isspace(*s)) s++;
2505 } /* Next address */
2506
2507 parse_allow_group = FALSE;
2508 parse_found_group = FALSE;
2509 } /* Next header unless yield has been set FALSE */
2510
2511 return yield;
2512 }
2513
2514
2515 /*************************************************
2516 * Check header names for 8-bit characters *
2517 *************************************************/
2518
2519 /* This function checks for invalid charcters in header names. See
2520 RFC 5322, 2.2. and RFC 6532, 3.
2521
2522 Arguments:
2523 msgptr where to put an error message
2524
2525 Returns: OK
2526 FAIL
2527 */
2528
2529 int
2530 verify_check_header_names_ascii(uschar **msgptr)
2531 {
2532 header_line *h;
2533 uschar *colon, *s;
2534
2535 for (h = header_list; h != NULL; h = h->next)
2536 {
2537 colon = Ustrchr(h->text, ':');
2538 for(s = h->text; s < colon; s++)
2539 {
2540 if ((*s < 33) || (*s > 126))
2541 {
2542 *msgptr = string_sprintf("Invalid character in header \"%.*s\" found",
2543 colon - h->text, h->text);
2544 return FAIL;
2545 }
2546 }
2547 }
2548 return OK;
2549 }
2550
2551 /*************************************************
2552 * Check for blind recipients *
2553 *************************************************/
2554
2555 /* This function checks that every (envelope) recipient is mentioned in either
2556 the To: or Cc: header lines, thus detecting blind carbon copies.
2557
2558 There are two ways of scanning that could be used: either scan the header lines
2559 and tick off the recipients, or scan the recipients and check the header lines.
2560 The original proposed patch did the former, but I have chosen to do the latter,
2561 because (a) it requires no memory and (b) will use fewer resources when there
2562 are many addresses in To: and/or Cc: and only one or two envelope recipients.
2563
2564 Arguments: none
2565 Returns: OK if there are no blind recipients
2566 FAIL if there is at least one blind recipient
2567 */
2568
2569 int
2570 verify_check_notblind(void)
2571 {
2572 int i;
2573 for (i = 0; i < recipients_count; i++)
2574 {
2575 header_line *h;
2576 BOOL found = FALSE;
2577 uschar *address = recipients_list[i].address;
2578
2579 for (h = header_list; !found && h != NULL; h = h->next)
2580 {
2581 uschar *colon, *s;
2582
2583 if (h->type != htype_to && h->type != htype_cc) continue;
2584
2585 colon = Ustrchr(h->text, ':');
2586 s = colon + 1;
2587 while (isspace(*s)) s++;
2588
2589 /* Loop for multiple addresses in the header, enabling group syntax. Note
2590 that we have to reset this after the header has been scanned. */
2591
2592 parse_allow_group = TRUE;
2593
2594 while (*s != 0)
2595 {
2596 uschar *ss = parse_find_address_end(s, FALSE);
2597 uschar *recipient,*errmess;
2598 int terminator = *ss;
2599 int start, end, domain;
2600
2601 /* Temporarily terminate the string at this point, and extract the
2602 operative address within, allowing group syntax. */
2603
2604 *ss = 0;
2605 recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
2606 *ss = terminator;
2607
2608 /* If we found a valid recipient that has a domain, compare it with the
2609 envelope recipient. Local parts are compared case-sensitively, domains
2610 case-insensitively. By comparing from the start with length "domain", we
2611 include the "@" at the end, which ensures that we are comparing the whole
2612 local part of each address. */
2613
2614 if (recipient != NULL && domain != 0)
2615 {
2616 found = Ustrncmp(recipient, address, domain) == 0 &&
2617 strcmpic(recipient + domain, address + domain) == 0;
2618 if (found) break;
2619 }
2620
2621 /* Advance to the next address */
2622
2623 s = ss + (terminator? 1:0);
2624 while (isspace(*s)) s++;
2625 } /* Next address */
2626
2627 parse_allow_group = FALSE;
2628 parse_found_group = FALSE;
2629 } /* Next header (if found is false) */
2630
2631 if (!found) return FAIL;
2632 } /* Next recipient */
2633
2634 return OK;
2635 }
2636
2637
2638
2639 /*************************************************
2640 * Find if verified sender *
2641 *************************************************/
2642
2643 /* Usually, just a single address is verified as the sender of the message.
2644 However, Exim can be made to verify other addresses as well (often related in
2645 some way), and this is useful in some environments. There may therefore be a
2646 chain of such addresses that have previously been tested. This function finds
2647 whether a given address is on the chain.
2648
2649 Arguments: the address to be verified
2650 Returns: pointer to an address item, or NULL
2651 */
2652
2653 address_item *
2654 verify_checked_sender(uschar *sender)
2655 {
2656 address_item *addr;
2657 for (addr = sender_verified_list; addr != NULL; addr = addr->next)
2658 if (Ustrcmp(sender, addr->address) == 0) break;
2659 return addr;
2660 }
2661
2662
2663
2664
2665
2666 /*************************************************
2667 * Get valid header address *
2668 *************************************************/
2669
2670 /* Scan the originator headers of the message, looking for an address that
2671 verifies successfully. RFC 822 says:
2672
2673 o The "Sender" field mailbox should be sent notices of
2674 any problems in transport or delivery of the original
2675 messages. If there is no "Sender" field, then the
2676 "From" field mailbox should be used.
2677
2678 o If the "Reply-To" field exists, then the reply should
2679 go to the addresses indicated in that field and not to
2680 the address(es) indicated in the "From" field.
2681
2682 So we check a Sender field if there is one, else a Reply_to field, else a From
2683 field. As some strange messages may have more than one of these fields,
2684 especially if they are resent- fields, check all of them if there is more than
2685 one.
2686
2687 Arguments:
2688 user_msgptr points to where to put a user error message
2689 log_msgptr points to where to put a log error message
2690 callout timeout for callout check (passed to verify_address())
2691 callout_overall overall callout timeout (ditto)
2692 callout_connect connect callout timeout (ditto)
2693 se_mailfrom mailfrom for verify; NULL => ""
2694 pm_mailfrom sender for pm callout check (passed to verify_address())
2695 options callout options (passed to verify_address())
2696 verrno where to put the address basic_errno
2697
2698 If log_msgptr is set to something without setting user_msgptr, the caller
2699 normally uses log_msgptr for both things.
2700
2701 Returns: result of the verification attempt: OK, FAIL, or DEFER;
2702 FAIL is given if no appropriate headers are found
2703 */
2704
2705 int
2706 verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr,
2707 int callout, int callout_overall, int callout_connect, uschar *se_mailfrom,
2708 uschar *pm_mailfrom, int options, int *verrno)
2709 {
2710 static int header_types[] = { htype_sender, htype_reply_to, htype_from };
2711 BOOL done = FALSE;
2712 int yield = FAIL;
2713 int i;
2714
2715 for (i = 0; i < 3 && !done; i++)
2716 {
2717 header_line *h;
2718 for (h = header_list; h != NULL && !done; h = h->next)
2719 {
2720 int terminator, new_ok;
2721 uschar *s, *ss, *endname;
2722
2723 if (h->type != header_types[i]) continue;
2724 s = endname = Ustrchr(h->text, ':') + 1;
2725
2726 /* Scan the addresses in the header, enabling group syntax. Note that we
2727 have to reset this after the header has been scanned. */
2728
2729 parse_allow_group = TRUE;
2730
2731 while (*s != 0)
2732 {
2733 address_item *vaddr;
2734
2735 while (isspace(*s) || *s == ',') s++;
2736 if (*s == 0) break; /* End of header */
2737
2738 ss = parse_find_address_end(s, FALSE);
2739
2740 /* The terminator is a comma or end of header, but there may be white
2741 space preceding it (including newline for the last address). Move back
2742 past any white space so we can check against any cached envelope sender
2743 address verifications. */
2744
2745 while (isspace(ss[-1])) ss--;
2746 terminator = *ss;
2747 *ss = 0;
2748
2749 HDEBUG(D_verify) debug_printf("verifying %.*s header address %s\n",
2750 (int)(endname - h->text), h->text, s);
2751
2752 /* See if we have already verified this address as an envelope sender,
2753 and if so, use the previous answer. */
2754
2755 vaddr = verify_checked_sender(s);
2756
2757 if (vaddr != NULL && /* Previously checked */
2758 (callout <= 0 || /* No callout needed; OR */
2759 vaddr->special_action > 256)) /* Callout was done */
2760 {
2761 new_ok = vaddr->special_action & 255;
2762 HDEBUG(D_verify) debug_printf("previously checked as envelope sender\n");
2763 *ss = terminator; /* Restore shortened string */
2764 }
2765
2766 /* Otherwise we run the verification now. We must restore the shortened
2767 string before running the verification, so the headers are correct, in
2768 case there is any rewriting. */
2769
2770 else
2771 {
2772 int start, end, domain;
2773 uschar *address = parse_extract_address(s, log_msgptr, &start, &end,
2774 &domain, FALSE);
2775
2776 *ss = terminator;
2777
2778 /* If we found an empty address, just carry on with the next one, but
2779 kill the message. */
2780
2781 if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0)
2782 {
2783 *log_msgptr = NULL;
2784 s = ss;
2785 continue;
2786 }
2787
2788 /* If verification failed because of a syntax error, fail this
2789 function, and ensure that the failing address gets added to the error
2790 message. */
2791
2792 if (address == NULL)
2793 {
2794 new_ok = FAIL;
2795 while (ss > s && isspace(ss[-1])) ss--;
2796 *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
2797 "scanning for sender: %s in \"%.*s\"",
2798 endname - h->text, h->text, *log_msgptr, ss - s, s);
2799 yield = FAIL;
2800 done = TRUE;
2801 break;
2802 }
2803
2804 /* Else go ahead with the sender verification. But it isn't *the*
2805 sender of the message, so set vopt_fake_sender to stop sender_address
2806 being replaced after rewriting or qualification. */
2807
2808 else
2809 {
2810 vaddr = deliver_make_addr(address, FALSE);
2811 new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender,
2812 callout, callout_overall, callout_connect, se_mailfrom,
2813 pm_mailfrom, NULL);
2814 }
2815 }
2816
2817 /* We now have the result, either newly found, or cached. If we are
2818 giving out error details, set a specific user error. This means that the
2819 last of these will be returned to the user if all three fail. We do not
2820 set a log message - the generic one below will be used. */
2821
2822 if (new_ok != OK)
2823 {
2824 *verrno = vaddr->basic_errno;
2825 if (smtp_return_error_details)
2826 {
2827 *user_msgptr = string_sprintf("Rejected after DATA: "
2828 "could not verify \"%.*s\" header address\n%s: %s",
2829 endname - h->text, h->text, vaddr->address, vaddr->message);
2830 }
2831 }
2832
2833 /* Success or defer */
2834
2835 if (new_ok == OK)
2836 {
2837 yield = OK;
2838 done = TRUE;
2839 break;
2840 }
2841
2842 if (new_ok == DEFER) yield = DEFER;
2843
2844 /* Move on to any more addresses in the header */
2845
2846 s = ss;
2847 } /* Next address */
2848
2849 parse_allow_group = FALSE;
2850 parse_found_group = FALSE;
2851 } /* Next header, unless done */
2852 } /* Next header type unless done */
2853
2854 if (yield == FAIL && *log_msgptr == NULL)
2855 *log_msgptr = US"there is no valid sender in any header line";
2856
2857 if (yield == DEFER && *log_msgptr == NULL)
2858 *log_msgptr = US"all attempts to verify a sender in a header line deferred";
2859
2860 return yield;
2861 }
2862
2863
2864
2865
2866 /*************************************************
2867 * Get RFC 1413 identification *
2868 *************************************************/
2869
2870 /* Attempt to get an id from the sending machine via the RFC 1413 protocol. If
2871 the timeout is set to zero, then the query is not done. There may also be lists
2872 of hosts and nets which are exempt. To guard against malefactors sending
2873 non-printing characters which could, for example, disrupt a message's headers,
2874 make sure the string consists of printing characters only.
2875
2876 Argument:
2877 port the port to connect to; usually this is IDENT_PORT (113), but when
2878 running in the test harness with -bh a different value is used.
2879
2880 Returns: nothing
2881
2882 Side effect: any received ident value is put in sender_ident (NULL otherwise)
2883 */
2884
2885 void
2886 verify_get_ident(int port)
2887 {
2888 int sock, host_af, qlen;
2889 int received_sender_port, received_interface_port, n;
2890 uschar *p;
2891 uschar buffer[2048];
2892
2893 /* Default is no ident. Check whether we want to do an ident check for this
2894 host. */
2895
2896 sender_ident = NULL;
2897 if (rfc1413_query_timeout <= 0 || verify_check_host(&rfc1413_hosts) != OK)
2898 return;
2899
2900 DEBUG(D_ident) debug_printf("doing ident callback\n");
2901
2902 /* Set up a connection to the ident port of the remote host. Bind the local end
2903 to the incoming interface address. If the sender host address is an IPv6
2904 address, the incoming interface address will also be IPv6. */
2905
2906 host_af = (Ustrchr(sender_host_address, ':') == NULL)? AF_INET : AF_INET6;
2907 sock = ip_socket(SOCK_STREAM, host_af);
2908 if (sock < 0) return;
2909
2910 if (ip_bind(sock, host_af, interface_address, 0) < 0)
2911 {
2912 DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n",
2913 strerror(errno));
2914 goto END_OFF;
2915 }
2916
2917 if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout)
2918 < 0)
2919 {
2920 if (errno == ETIMEDOUT && LOGGING(ident_timeout))
2921 {
2922 log_write(0, LOG_MAIN, "ident connection to %s timed out",
2923 sender_host_address);
2924 }
2925 else
2926 {
2927 DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n",
2928 sender_host_address, strerror(errno));
2929 }
2930 goto END_OFF;
2931 }
2932
2933 /* Construct and send the query. */
2934
2935 sprintf(CS buffer, "%d , %d\r\n", sender_host_port, interface_port);
2936 qlen = Ustrlen(buffer);
2937 if (send(sock, buffer, qlen, 0) < 0)
2938 {
2939 DEBUG(D_ident) debug_printf("ident send failed: %s\n", strerror(errno));
2940 goto END_OFF;
2941 }
2942
2943 /* Read a response line. We put it into the rest of the buffer, using several
2944 recv() calls if necessary. */
2945
2946 p = buffer + qlen;
2947
2948 for (;;)
2949 {
2950 uschar *pp;
2951 int count;
2952 int size = sizeof(buffer) - (p - buffer);
2953
2954 if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */
2955 count = ip_recv(sock, p, size, rfc1413_query_timeout);
2956 if (count <= 0) goto END_OFF; /* Read error or EOF */
2957
2958 /* Scan what we just read, to see if we have reached the terminating \r\n. Be
2959 generous, and accept a plain \n terminator as well. The only illegal
2960 character is 0. */
2961
2962 for (pp = p; pp < p + count; pp++)
2963 {
2964 if (*pp == 0) goto END_OFF; /* Zero octet not allowed */
2965 if (*pp == '\n')
2966 {
2967 if (pp[-1] == '\r') pp--;
2968 *pp = 0;
2969 goto GOT_DATA; /* Break out of both loops */
2970 }
2971 }
2972
2973 /* Reached the end of the data without finding \n. Let the loop continue to
2974 read some more, if there is room. */
2975
2976 p = pp;
2977 }
2978
2979 GOT_DATA:
2980
2981 /* We have received a line of data. Check it carefully. It must start with the
2982 same two port numbers that we sent, followed by data as defined by the RFC. For
2983 example,
2984
2985 12345 , 25 : USERID : UNIX :root
2986
2987 However, the amount of white space may be different to what we sent. In the
2988 "osname" field there may be several sub-fields, comma separated. The data we
2989 actually want to save follows the third colon. Some systems put leading spaces
2990 in it - we discard those. */
2991
2992 if (sscanf(CS buffer + qlen, "%d , %d%n", &received_sender_port,
2993 &received_interface_port, &n) != 2 ||
2994 received_sender_port != sender_host_port ||
2995 received_interface_port != interface_port)
2996 goto END_OFF;
2997
2998 p = buffer + qlen + n;
2999 while(isspace(*p)) p++;
3000 if (*p++ != ':') goto END_OFF;
3001 while(isspace(*p)) p++;
3002 if (Ustrncmp(p, "USERID", 6) != 0) goto END_OFF;
3003 p += 6;
3004 while(isspace(*p)) p++;
3005 if (*p++ != ':') goto END_OFF;
3006 while (*p != 0 && *p != ':') p++;
3007 if (*p++ == 0) goto END_OFF;
3008 while(isspace(*p)) p++;
3009 if (*p == 0) goto END_OFF;
3010
3011 /* The rest of the line is the data we want. We turn it into printing
3012 characters when we save it, so that it cannot mess up the format of any logging
3013 or Received: lines into which it gets inserted. We keep a maximum of 127
3014 characters. The deconst cast is ok as we fed a nonconst to string_printing() */
3015
3016 sender_ident = US string_printing(string_copyn(p, 127));
3017 DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident);
3018
3019 END_OFF:
3020 (void)close(sock);
3021 return;
3022 }
3023
3024
3025
3026
3027 /*************************************************
3028 * Match host to a single host-list item *
3029 *************************************************/
3030
3031 /* This function compares a host (name or address) against a single item
3032 from a host list. The host name gets looked up if it is needed and is not
3033 already known. The function is called from verify_check_this_host() via
3034 match_check_list(), which is why most of its arguments are in a single block.
3035
3036 Arguments:
3037 arg the argument block (see below)
3038 ss the host-list item
3039 valueptr where to pass back looked up data, or NULL
3040 error for error message when returning ERROR
3041
3042 The block contains:
3043 host_name (a) the host name, or
3044 (b) NULL, implying use sender_host_name and
3045 sender_host_aliases, looking them up if required, or
3046 (c) the empty string, meaning that only IP address matches
3047 are permitted
3048 host_address the host address
3049 host_ipv4 the IPv4 address taken from an IPv6 one
3050
3051 Returns: OK matched
3052 FAIL did not match
3053 DEFER lookup deferred
3054 ERROR (a) failed to find the host name or IP address, or
3055 (b) unknown lookup type specified, or
3056 (c) host name encountered when only IP addresses are
3057 being matched
3058 */
3059
3060 int
3061 check_host(void *arg, const uschar *ss, const uschar **valueptr, uschar **error)
3062 {
3063 check_host_block *cb = (check_host_block *)arg;
3064 int mlen = -1;
3065 int maskoffset;
3066 BOOL iplookup = FALSE;
3067 BOOL isquery = FALSE;
3068 BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0;
3069 const uschar *t;
3070 uschar *semicolon;
3071 uschar **aliases;
3072
3073 /* Optimize for the special case when the pattern is "*". */
3074
3075 if (*ss == '*' && ss[1] == 0) return OK;
3076
3077 /* If the pattern is empty, it matches only in the case when there is no host -
3078 this can occur in ACL checking for SMTP input using the -bs option. In this
3079 situation, the host address is the empty string. */
3080
3081 if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL;
3082 if (*ss == 0) return FAIL;
3083
3084 /* If the pattern is precisely "@" then match against the primary host name,
3085 provided that host name matching is permitted; if it's "@[]" match against the
3086 local host's IP addresses. */
3087
3088 if (*ss == '@')
3089 {
3090 if (ss[1] == 0)
3091 {
3092 if (isiponly) return ERROR;
3093 ss = primary_hostname;
3094 }
3095 else if (Ustrcmp(ss, "@[]") == 0)
3096 {
3097 ip_address_item *ip;
3098 for (ip = host_find_interfaces(); ip != NULL; ip = ip->next)
3099 if (Ustrcmp(ip->address, cb->host_address) == 0) return OK;
3100 return FAIL;
3101 }
3102 }
3103
3104 /* If the pattern is an IP address, optionally followed by a bitmask count, do
3105 a (possibly masked) comparision with the current IP address. */
3106
3107 if (string_is_ip_address(ss, &maskoffset) != 0)
3108 return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL);
3109
3110 /* The pattern is not an IP address. A common error that people make is to omit
3111 one component of an IPv4 address, either by accident, or believing that, for
3112 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,
3113 which it isn't. (Those applications that do accept 1.2.3 as an IP address
3114 interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an
3115 ancient specification.) To aid in debugging these cases, we give a specific
3116 error if the pattern contains only digits and dots or contains a slash preceded
3117 only by digits and dots (a slash at the start indicates a file name and of
3118 course slashes may be present in lookups, but not preceded only by digits and
3119 dots). */
3120
3121 for (t = ss; isdigit(*t) || *t == '.'; t++);
3122 if (*t == 0 || (*t == '/' && t != ss))
3123 {
3124 *error = US"malformed IPv4 address or address mask";
3125 return ERROR;
3126 }
3127
3128 /* See if there is a semicolon in the pattern */
3129
3130 semicolon = Ustrchr(ss, ';');
3131
3132 /* If we are doing an IP address only match, then all lookups must be IP
3133 address lookups, even if there is no "net-". */
3134
3135 if (isiponly)
3136 {
3137 iplookup = semicolon != NULL;
3138 }
3139
3140 /* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is
3141 a lookup on a masked IP network, in textual form. We obey this code even if we
3142 have already set iplookup, so as to skip over the "net-" prefix and to set the
3143 mask length. The net- stuff really only applies to single-key lookups where the
3144 key is implicit. For query-style lookups the key is specified in the query.
3145 From release 4.30, the use of net- for query style is no longer needed, but we
3146 retain it for backward compatibility. */
3147
3148 if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL)
3149 {
3150 mlen = 0;
3151 for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0';
3152 if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */
3153 iplookup = (*t++ == '-');
3154 }
3155 else t = ss;
3156
3157 /* Do the IP address lookup if that is indeed what we have */
3158
3159 if (iplookup)
3160 {
3161 int insize;
3162 int search_type;
3163 int incoming[4];
3164 void *handle;
3165 uschar *filename, *key, *result;
3166 uschar buffer[64];
3167
3168 /* Find the search type */
3169
3170 search_type = search_findtype(t, semicolon - t);
3171
3172 if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
3173 search_error_message);
3174
3175 /* Adjust parameters for the type of lookup. For a query-style lookup, there
3176 is no file name, and the "key" is just the query. For query-style with a file
3177 name, we have to fish the file off the start of the query. For a single-key
3178 lookup, the key is the current IP address, masked appropriately, and
3179 reconverted to text form, with the mask appended. For IPv6 addresses, specify
3180 dot separators instead of colons, except when the lookup type is "iplsearch".
3181 */
3182
3183 if (mac_islookup(search_type, lookup_absfilequery))
3184 {
3185 filename = semicolon + 1;
3186 key = filename;
3187 while (*key != 0 && !isspace(*key)) key++;
3188 filename = string_copyn(filename, key - filename);
3189 while (isspace(*key)) key++;
3190 }
3191 else if (mac_islookup(search_type, lookup_querystyle))
3192 {
3193 filename = NULL;
3194 key = semicolon + 1;
3195 }
3196 else /* Single-key style */
3197 {
3198 int sep = (Ustrcmp(lookup_list[search_type]->name, "iplsearch") == 0)?
3199 ':' : '.';
3200 insize = host_aton(cb->host_address, incoming);
3201 host_mask(insize, incoming, mlen);
3202 (void)host_nmtoa(insize, incoming, mlen, buffer, sep);
3203 key = buffer;
3204 filename = semicolon + 1;
3205 }
3206
3207 /* Now do the actual lookup; note that there is no search_close() because
3208 of the caching arrangements. */
3209
3210 if (!(handle = search_open(filename, search_type, 0, NULL, NULL)))
3211 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", search_error_message);
3212
3213 result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL);
3214 if (valueptr != NULL) *valueptr = result;
3215 return (result != NULL)? OK : search_find_defer? DEFER: FAIL;
3216 }
3217
3218 /* The pattern is not an IP address or network reference of any kind. That is,
3219 it is a host name pattern. If this is an IP only match, there's an error in the
3220 host list. */
3221
3222 if (isiponly)
3223 {
3224 *error = US"cannot match host name in match_ip list";
3225 return ERROR;
3226 }
3227
3228 /* Check the characters of the pattern to see if they comprise only letters,
3229 digits, full stops, and hyphens (the constituents of domain names). Allow
3230 underscores, as they are all too commonly found. Sigh. Also, if
3231 allow_utf8_domains is set, allow top-bit characters. */
3232
3233 for (t = ss; *t != 0; t++)
3234 if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' &&
3235 (!allow_utf8_domains || *t < 128)) break;
3236
3237 /* If the pattern is a complete domain name, with no fancy characters, look up
3238 its IP address and match against that. Note that a multi-homed host will add
3239 items to the chain. */
3240
3241 if (*t == 0)
3242 {
3243 int rc;
3244 host_item h;
3245 h.next = NULL;
3246 h.name = ss;
3247 h.address = NULL;
3248 h.mx = MX_NONE;
3249
3250 /* Using byname rather than bydns here means we cannot determine dnssec
3251 status. On the other hand it is unclear how that could be either
3252 propagated up or enforced. */
3253
3254 rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE);
3255 if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
3256 {
3257 host_item *hh;
3258 for (hh = &h; hh != NULL; hh = hh->next)
3259 {
3260 if (host_is_in_net(hh->address, cb->host_address, 0)) return OK;
3261 }
3262 return FAIL;
3263 }
3264 if (rc == HOST_FIND_AGAIN) return DEFER;
3265 *error = string_sprintf("failed to find IP address for %s", ss);
3266 return ERROR;
3267 }
3268
3269 /* Almost all subsequent comparisons require the host name, and can be done
3270 using the general string matching function. When this function is called for
3271 outgoing hosts, the name is always given explicitly. If it is NULL, it means we
3272 must use sender_host_name and its aliases, looking them up if necessary. */
3273
3274 if (cb->host_name != NULL) /* Explicit host name given */
3275 return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE,
3276 valueptr);
3277
3278 /* Host name not given; in principle we need the sender host name and its
3279 aliases. However, for query-style lookups, we do not need the name if the
3280 query does not contain $sender_host_name. From release 4.23, a reference to
3281 $sender_host_name causes it to be looked up, so we don't need to do the lookup
3282 on spec. */
3283
3284 if ((semicolon = Ustrchr(ss, ';')) != NULL)
3285 {
3286 const uschar *affix;
3287 int partial, affixlen, starflags, id;
3288
3289 *semicolon = 0;
3290 id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags);
3291 *semicolon=';';
3292
3293 if (id < 0) /* Unknown lookup type */
3294 {
3295 log_write(0, LOG_MAIN|LOG_PANIC, "%s in host list item \"%s\"",
3296 search_error_message, ss);
3297 return DEFER;
3298 }
3299 isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery);
3300 }
3301
3302 if (isquery)
3303 {
3304 switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr))
3305 {
3306 case OK: return OK;
3307 case DEFER: return DEFER;
3308 default: return FAIL;
3309 }
3310 }
3311
3312 /* Not a query-style lookup; must ensure the host name is present, and then we
3313 do a check on the name and all its aliases. */
3314
3315 if (sender_host_name == NULL)
3316 {
3317 HDEBUG(D_host_lookup)
3318 debug_printf("sender host name required, to match against %s\n", ss);
3319 if (host_lookup_failed || host_name_lookup() != OK)
3320 {
3321 *error = string_sprintf("failed to find host name for %s",
3322 sender_host_address);;
3323 return ERROR;
3324 }
3325 host_build_sender_fullhost();
3326 }
3327
3328 /* Match on the sender host name, using the general matching function */
3329
3330 switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE,
3331 valueptr))
3332 {
3333 case OK: return OK;
3334 case DEFER: return DEFER;
3335 }
3336
3337 /* If there are aliases, try matching on them. */
3338
3339 aliases = sender_host_aliases;
3340 while (*aliases != NULL)
3341 {
3342 switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr))
3343 {
3344 case OK: return OK;
3345 case DEFER: return DEFER;
3346 }
3347 }
3348 return FAIL;
3349 }
3350
3351
3352
3353
3354 /*************************************************
3355 * Check a specific host matches a host list *
3356 *************************************************/
3357
3358 /* This function is passed a host list containing items in a number of
3359 different formats and the identity of a host. Its job is to determine whether
3360 the given host is in the set of hosts defined by the list. The host name is
3361 passed as a pointer so that it can be looked up if needed and not already
3362 known. This is commonly the case when called from verify_check_host() to check
3363 an incoming connection. When called from elsewhere the host name should usually
3364 be set.
3365
3366 This function is now just a front end to match_check_list(), which runs common
3367 code for scanning a list. We pass it the check_host() function to perform a
3368 single test.
3369
3370 Arguments:
3371 listptr pointer to the host list
3372 cache_bits pointer to cache for named lists, or NULL
3373 host_name the host name or NULL, implying use sender_host_name and
3374 sender_host_aliases, looking them up if required
3375 host_address the IP address
3376 valueptr if not NULL, data from a lookup is passed back here
3377
3378 Returns: OK if the host is in the defined set
3379 FAIL if the host is not in the defined set,
3380 DEFER if a data lookup deferred (not a host lookup)
3381
3382 If the host name was needed in order to make a comparison, and could not be
3383 determined from the IP address, the result is FAIL unless the item
3384 "+allow_unknown" was met earlier in the list, in which case OK is returned. */
3385
3386 int
3387 verify_check_this_host(const uschar **listptr, unsigned int *cache_bits,
3388 const uschar *host_name, const uschar *host_address, const uschar **valueptr)
3389 {
3390 int rc;
3391 unsigned int *local_cache_bits = cache_bits;
3392 const uschar *save_host_address = deliver_host_address;
3393 check_host_block cb;
3394 cb.host_name = host_name;
3395 cb.host_address = host_address;
3396
3397 if (valueptr != NULL) *valueptr = NULL;
3398
3399 /* If the host address starts off ::ffff: it is an IPv6 address in
3400 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
3401 addresses. */
3402
3403 cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)?
3404 host_address + 7 : host_address;
3405
3406 /* During the running of the check, put the IP address into $host_address. In
3407 the case of calls from the smtp transport, it will already be there. However,
3408 in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
3409 the safe side, any existing setting is preserved, though as I write this
3410 (November 2004) I can't see any cases where it is actually needed. */
3411
3412 deliver_host_address = host_address;
3413 rc = match_check_list(
3414 listptr, /* the list */
3415 0, /* separator character */
3416 &hostlist_anchor, /* anchor pointer */
3417 &local_cache_bits, /* cache pointer */
3418 check_host, /* function for testing */
3419 &cb, /* argument for function */
3420 MCL_HOST, /* type of check */
3421 (host_address == sender_host_address)?
3422 US"host" : host_address, /* text for debugging */
3423 valueptr); /* where to pass back data */
3424 deliver_host_address = save_host_address;
3425 return rc;
3426 }
3427
3428
3429
3430
3431 /*************************************************
3432 * Check the given host item matches a list *
3433 *************************************************/
3434 int
3435 verify_check_given_host(uschar **listptr, host_item *host)
3436 {
3437 return verify_check_this_host(CUSS listptr, NULL, host->name, host->address, NULL);
3438 }
3439
3440 /*************************************************
3441 * Check the remote host matches a list *
3442 *************************************************/
3443
3444 /* This is a front end to verify_check_this_host(), created because checking
3445 the remote host is a common occurrence. With luck, a good compiler will spot
3446 the tail recursion and optimize it. If there's no host address, this is
3447 command-line SMTP input - check against an empty string for the address.
3448
3449 Arguments:
3450 listptr pointer to the host list
3451
3452 Returns: the yield of verify_check_this_host(),
3453 i.e. OK, FAIL, or DEFER
3454 */