Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
2331cfe7 | 5 | /* Copyright (c) University of Cambridge 1995 - 2014 */ |
059ec3d9 PH |
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" | |
817d9f57 | 13 | #include "transports/smtp.h" |
059ec3d9 | 14 | |
e4bdf652 JH |
15 | #define CUTTHROUGH_CMD_TIMEOUT 30 /* timeout for cutthrough-routing calls */ |
16 | #define CUTTHROUGH_DATA_TIMEOUT 60 /* timeout for cutthrough-routing calls */ | |
817d9f57 JH |
17 | static smtp_outblock ctblock; |
18 | uschar ctbuffer[8192]; | |
19 | ||
059ec3d9 PH |
20 | |
21 | /* Structure for caching DNSBL lookups */ | |
22 | ||
23 | typedef struct dnsbl_cache_block { | |
24 | dns_address *rhs; | |
25 | uschar *text; | |
26 | int rc; | |
27 | BOOL text_set; | |
28 | } dnsbl_cache_block; | |
29 | ||
30 | ||
31 | /* Anchor for DNSBL cache */ | |
32 | ||
33 | static tree_node *dnsbl_cache = NULL; | |
34 | ||
35 | ||
431b7361 PH |
36 | /* Bits for match_type in one_check_dnsbl() */ |
37 | ||
38 | #define MT_NOT 1 | |
39 | #define MT_ALL 2 | |
40 | ||
5032d1cf | 41 | static uschar cutthrough_response(char, uschar **); |
431b7361 | 42 | |
059ec3d9 PH |
43 | |
44 | /************************************************* | |
45 | * Retrieve a callout cache record * | |
46 | *************************************************/ | |
47 | ||
48 | /* If a record exists, check whether it has expired. | |
49 | ||
50 | Arguments: | |
51 | dbm_file an open hints file | |
52 | key the record key | |
53 | type "address" or "domain" | |
54 | positive_expire expire time for positive records | |
55 | negative_expire expire time for negative records | |
56 | ||
57 | Returns: the cache record if a non-expired one exists, else NULL | |
58 | */ | |
59 | ||
60 | static dbdata_callout_cache * | |
61 | get_callout_cache_record(open_db *dbm_file, uschar *key, uschar *type, | |
62 | int positive_expire, int negative_expire) | |
63 | { | |
64 | BOOL negative; | |
65 | int length, expire; | |
66 | time_t now; | |
67 | dbdata_callout_cache *cache_record; | |
68 | ||
69 | cache_record = dbfn_read_with_length(dbm_file, key, &length); | |
70 | ||
71 | if (cache_record == NULL) | |
72 | { | |
73 | HDEBUG(D_verify) debug_printf("callout cache: no %s record found\n", type); | |
74 | return NULL; | |
75 | } | |
76 | ||
77 | /* We treat a record as "negative" if its result field is not positive, or if | |
78 | it is a domain record and the postmaster field is negative. */ | |
79 | ||
80 | negative = cache_record->result != ccache_accept || | |
81 | (type[0] == 'd' && cache_record->postmaster_result == ccache_reject); | |
82 | expire = negative? negative_expire : positive_expire; | |
83 | now = time(NULL); | |
84 | ||
85 | if (now - cache_record->time_stamp > expire) | |
86 | { | |
87 | HDEBUG(D_verify) debug_printf("callout cache: %s record expired\n", type); | |
88 | return NULL; | |
89 | } | |
90 | ||
91 | /* If this is a non-reject domain record, check for the obsolete format version | |
92 | that doesn't have the postmaster and random timestamps, by looking at the | |
93 | length. If so, copy it to a new-style block, replicating the record's | |
94 | timestamp. Then check the additional timestamps. (There's no point wasting | |
95 | effort if connections are rejected.) */ | |
96 | ||
97 | if (type[0] == 'd' && cache_record->result != ccache_reject) | |
98 | { | |
99 | if (length == sizeof(dbdata_callout_cache_obs)) | |
100 | { | |
101 | dbdata_callout_cache *new = store_get(sizeof(dbdata_callout_cache)); | |
102 | memcpy(new, cache_record, length); | |
103 | new->postmaster_stamp = new->random_stamp = new->time_stamp; | |
104 | cache_record = new; | |
105 | } | |
106 | ||
107 | if (now - cache_record->postmaster_stamp > expire) | |
108 | cache_record->postmaster_result = ccache_unknown; | |
109 | ||
110 | if (now - cache_record->random_stamp > expire) | |
111 | cache_record->random_result = ccache_unknown; | |
112 | } | |
113 | ||
114 | HDEBUG(D_verify) debug_printf("callout cache: found %s record\n", type); | |
115 | return cache_record; | |
116 | } | |
117 | ||
118 | ||
119 | ||
120 | /************************************************* | |
121 | * Do callout verification for an address * | |
122 | *************************************************/ | |
123 | ||
124 | /* This function is called from verify_address() when the address has routed to | |
125 | a host list, and a callout has been requested. Callouts are expensive; that is | |
126 | why a cache is used to improve the efficiency. | |
127 | ||
128 | Arguments: | |
129 | addr the address that's been routed | |
130 | host_list the list of hosts to try | |
131 | tf the transport feedback block | |
132 | ||
133 | ifstring "interface" option from transport, or NULL | |
134 | portstring "port" option from transport, or NULL | |
135 | protocolstring "protocol" option from transport, or NULL | |
136 | callout the per-command callout timeout | |
4deaf07d PH |
137 | callout_overall the overall callout timeout (if < 0 use 4*callout) |
138 | callout_connect the callout connection timeout (if < 0 use callout) | |
059ec3d9 PH |
139 | options the verification options - these bits are used: |
140 | vopt_is_recipient => this is a recipient address | |
141 | vopt_callout_no_cache => don't use callout cache | |
2a4be8f9 | 142 | vopt_callout_fullpm => if postmaster check, do full one |
059ec3d9 PH |
143 | vopt_callout_random => do the "random" thing |
144 | vopt_callout_recipsender => use real sender for recipient | |
145 | vopt_callout_recippmaster => use postmaster for recipient | |
146 | se_mailfrom MAIL FROM address for sender verify; NULL => "" | |
147 | pm_mailfrom if non-NULL, do the postmaster check with this sender | |
148 | ||
149 | Returns: OK/FAIL/DEFER | |
150 | */ | |
151 | ||
152 | static int | |
153 | do_callout(address_item *addr, host_item *host_list, transport_feedback *tf, | |
8e669ac1 | 154 | int callout, int callout_overall, int callout_connect, int options, |
4deaf07d | 155 | uschar *se_mailfrom, uschar *pm_mailfrom) |
059ec3d9 PH |
156 | { |
157 | BOOL is_recipient = (options & vopt_is_recipient) != 0; | |
158 | BOOL callout_no_cache = (options & vopt_callout_no_cache) != 0; | |
159 | BOOL callout_random = (options & vopt_callout_random) != 0; | |
160 | ||
161 | int yield = OK; | |
2b1c6e3a | 162 | int old_domain_cache_result = ccache_accept; |
059ec3d9 PH |
163 | BOOL done = FALSE; |
164 | uschar *address_key; | |
165 | uschar *from_address; | |
166 | uschar *random_local_part = NULL; | |
750af86e | 167 | uschar *save_deliver_domain = deliver_domain; |
8e669ac1 | 168 | uschar **failure_ptr = is_recipient? |
2c7db3f5 | 169 | &recipient_verify_failure : &sender_verify_failure; |
059ec3d9 PH |
170 | open_db dbblock; |
171 | open_db *dbm_file = NULL; | |
172 | dbdata_callout_cache new_domain_record; | |
173 | dbdata_callout_cache_address new_address_record; | |
174 | host_item *host; | |
175 | time_t callout_start_time; | |
176 | ||
177 | new_domain_record.result = ccache_unknown; | |
178 | new_domain_record.postmaster_result = ccache_unknown; | |
179 | new_domain_record.random_result = ccache_unknown; | |
180 | ||
181 | memset(&new_address_record, 0, sizeof(new_address_record)); | |
182 | ||
183 | /* For a recipient callout, the key used for the address cache record must | |
184 | include the sender address if we are using the real sender in the callout, | |
185 | because that may influence the result of the callout. */ | |
186 | ||
187 | address_key = addr->address; | |
188 | from_address = US""; | |
189 | ||
190 | if (is_recipient) | |
191 | { | |
5032d1cf | 192 | if (options & vopt_callout_recipsender) |
059ec3d9 PH |
193 | { |
194 | address_key = string_sprintf("%s/<%s>", addr->address, sender_address); | |
195 | from_address = sender_address; | |
196 | } | |
5032d1cf | 197 | else if (options & vopt_callout_recippmaster) |
059ec3d9 PH |
198 | { |
199 | address_key = string_sprintf("%s/<postmaster@%s>", addr->address, | |
200 | qualify_domain_sender); | |
201 | from_address = string_sprintf("postmaster@%s", qualify_domain_sender); | |
202 | } | |
203 | } | |
204 | ||
205 | /* For a sender callout, we must adjust the key if the mailfrom address is not | |
206 | empty. */ | |
207 | ||
208 | else | |
209 | { | |
210 | from_address = (se_mailfrom == NULL)? US"" : se_mailfrom; | |
211 | if (from_address[0] != 0) | |
212 | address_key = string_sprintf("%s/<%s>", addr->address, from_address); | |
213 | } | |
214 | ||
215 | /* Open the callout cache database, it it exists, for reading only at this | |
216 | stage, unless caching has been disabled. */ | |
217 | ||
218 | if (callout_no_cache) | |
219 | { | |
220 | HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n"); | |
221 | } | |
222 | else if ((dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE)) == NULL) | |
223 | { | |
224 | HDEBUG(D_verify) debug_printf("callout cache: not available\n"); | |
225 | } | |
226 | ||
227 | /* If a cache database is available see if we can avoid the need to do an | |
228 | actual callout by making use of previously-obtained data. */ | |
229 | ||
230 | if (dbm_file != NULL) | |
231 | { | |
232 | dbdata_callout_cache_address *cache_address_record; | |
233 | dbdata_callout_cache *cache_record = get_callout_cache_record(dbm_file, | |
234 | addr->domain, US"domain", | |
235 | callout_cache_domain_positive_expire, | |
236 | callout_cache_domain_negative_expire); | |
237 | ||
238 | /* If an unexpired cache record was found for this domain, see if the callout | |
239 | process can be short-circuited. */ | |
240 | ||
241 | if (cache_record != NULL) | |
242 | { | |
2b1c6e3a PH |
243 | /* In most cases, if an early command (up to and including MAIL FROM:<>) |
244 | was rejected, there is no point carrying on. The callout fails. However, if | |
245 | we are doing a recipient verification with use_sender or use_postmaster | |
246 | set, a previous failure of MAIL FROM:<> doesn't count, because this time we | |
247 | will be using a non-empty sender. We have to remember this situation so as | |
248 | not to disturb the cached domain value if this whole verification succeeds | |
249 | (we don't want it turning into "accept"). */ | |
250 | ||
251 | old_domain_cache_result = cache_record->result; | |
252 | ||
253 | if (cache_record->result == ccache_reject || | |
254 | (*from_address == 0 && cache_record->result == ccache_reject_mfnull)) | |
059ec3d9 PH |
255 | { |
256 | setflag(addr, af_verify_nsfail); | |
257 | HDEBUG(D_verify) | |
258 | debug_printf("callout cache: domain gave initial rejection, or " | |
259 | "does not accept HELO or MAIL FROM:<>\n"); | |
260 | setflag(addr, af_verify_nsfail); | |
261 | addr->user_message = US"(result of an earlier callout reused)."; | |
262 | yield = FAIL; | |
8e669ac1 | 263 | *failure_ptr = US"mail"; |
059ec3d9 PH |
264 | goto END_CALLOUT; |
265 | } | |
266 | ||
267 | /* If a previous check on a "random" local part was accepted, we assume | |
268 | that the server does not do any checking on local parts. There is therefore | |
269 | no point in doing the callout, because it will always be successful. If a | |
270 | random check previously failed, arrange not to do it again, but preserve | |
271 | the data in the new record. If a random check is required but hasn't been | |
272 | done, skip the remaining cache processing. */ | |
273 | ||
274 | if (callout_random) switch(cache_record->random_result) | |
275 | { | |
276 | case ccache_accept: | |
277 | HDEBUG(D_verify) | |
278 | debug_printf("callout cache: domain accepts random addresses\n"); | |
279 | goto END_CALLOUT; /* Default yield is OK */ | |
280 | ||
281 | case ccache_reject: | |
282 | HDEBUG(D_verify) | |
283 | debug_printf("callout cache: domain rejects random addresses\n"); | |
284 | callout_random = FALSE; | |
285 | new_domain_record.random_result = ccache_reject; | |
286 | new_domain_record.random_stamp = cache_record->random_stamp; | |
287 | break; | |
288 | ||
289 | default: | |
290 | HDEBUG(D_verify) | |
291 | debug_printf("callout cache: need to check random address handling " | |
292 | "(not cached or cache expired)\n"); | |
293 | goto END_CACHE; | |
294 | } | |
295 | ||
296 | /* If a postmaster check is requested, but there was a previous failure, | |
297 | there is again no point in carrying on. If a postmaster check is required, | |
298 | but has not been done before, we are going to have to do a callout, so skip | |
299 | remaining cache processing. */ | |
300 | ||
301 | if (pm_mailfrom != NULL) | |
302 | { | |
303 | if (cache_record->postmaster_result == ccache_reject) | |
304 | { | |
305 | setflag(addr, af_verify_pmfail); | |
306 | HDEBUG(D_verify) | |
307 | debug_printf("callout cache: domain does not accept " | |
308 | "RCPT TO:<postmaster@domain>\n"); | |
309 | yield = FAIL; | |
8e669ac1 | 310 | *failure_ptr = US"postmaster"; |
059ec3d9 PH |
311 | setflag(addr, af_verify_pmfail); |
312 | addr->user_message = US"(result of earlier verification reused)."; | |
313 | goto END_CALLOUT; | |
314 | } | |
315 | if (cache_record->postmaster_result == ccache_unknown) | |
316 | { | |
317 | HDEBUG(D_verify) | |
318 | debug_printf("callout cache: need to check RCPT " | |
319 | "TO:<postmaster@domain> (not cached or cache expired)\n"); | |
320 | goto END_CACHE; | |
321 | } | |
322 | ||
323 | /* If cache says OK, set pm_mailfrom NULL to prevent a redundant | |
324 | postmaster check if the address itself has to be checked. Also ensure | |
325 | that the value in the cache record is preserved (with its old timestamp). | |
326 | */ | |
327 | ||
328 | HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT " | |
329 | "TO:<postmaster@domain>\n"); | |
330 | pm_mailfrom = NULL; | |
331 | new_domain_record.postmaster_result = ccache_accept; | |
332 | new_domain_record.postmaster_stamp = cache_record->postmaster_stamp; | |
333 | } | |
334 | } | |
335 | ||
336 | /* We can't give a result based on information about the domain. See if there | |
337 | is an unexpired cache record for this specific address (combined with the | |
338 | sender address if we are doing a recipient callout with a non-empty sender). | |
339 | */ | |
340 | ||
341 | cache_address_record = (dbdata_callout_cache_address *) | |
342 | get_callout_cache_record(dbm_file, | |
343 | address_key, US"address", | |
344 | callout_cache_positive_expire, | |
345 | callout_cache_negative_expire); | |
346 | ||
347 | if (cache_address_record != NULL) | |
348 | { | |
349 | if (cache_address_record->result == ccache_accept) | |
350 | { | |
351 | HDEBUG(D_verify) | |
352 | debug_printf("callout cache: address record is positive\n"); | |
353 | } | |
354 | else | |
355 | { | |
356 | HDEBUG(D_verify) | |
357 | debug_printf("callout cache: address record is negative\n"); | |
358 | addr->user_message = US"Previous (cached) callout verification failure"; | |
8e669ac1 | 359 | *failure_ptr = US"recipient"; |
059ec3d9 PH |
360 | yield = FAIL; |
361 | } | |
362 | goto END_CALLOUT; | |
363 | } | |
364 | ||
365 | /* Close the cache database while we actually do the callout for real. */ | |
366 | ||
367 | END_CACHE: | |
368 | dbfn_close(dbm_file); | |
369 | dbm_file = NULL; | |
370 | } | |
371 | ||
193e3acd | 372 | if (!addr->transport) |
059ec3d9 | 373 | { |
193e3acd | 374 | HDEBUG(D_verify) debug_printf("cannot callout via null transport\n"); |
059ec3d9 | 375 | } |
6681531a HSHR |
376 | else if (Ustrcmp(addr->transport->driver_name, "smtp") != 0) |
377 | log_write(0, LOG_MAIN|LOG_PANIC|LOG_CONFIG_FOR, "callout transport '%s': %s is non-smtp", | |
378 | addr->transport->name, addr->transport->driver_name); | |
193e3acd JH |
379 | else |
380 | { | |
381 | smtp_transport_options_block *ob = | |
9d9c3746 | 382 | (smtp_transport_options_block *)addr->transport->options_block; |
059ec3d9 | 383 | |
193e3acd JH |
384 | /* The information wasn't available in the cache, so we have to do a real |
385 | callout and save the result in the cache for next time, unless no_cache is set, | |
386 | or unless we have a previously cached negative random result. If we are to test | |
387 | with a random local part, ensure that such a local part is available. If not, | |
388 | log the fact, but carry on without randomming. */ | |
059ec3d9 | 389 | |
193e3acd JH |
390 | if (callout_random && callout_random_local_part != NULL) |
391 | { | |
392 | random_local_part = expand_string(callout_random_local_part); | |
393 | if (random_local_part == NULL) | |
394 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand " | |
395 | "callout_random_local_part: %s", expand_string_message); | |
396 | } | |
059ec3d9 | 397 | |
193e3acd JH |
398 | /* Default the connect and overall callout timeouts if not set, and record the |
399 | time we are starting so that we can enforce it. */ | |
4c590bd1 | 400 | |
193e3acd JH |
401 | if (callout_overall < 0) callout_overall = 4 * callout; |
402 | if (callout_connect < 0) callout_connect = callout; | |
403 | callout_start_time = time(NULL); | |
4c590bd1 | 404 | |
193e3acd JH |
405 | /* Before doing a real callout, if this is an SMTP connection, flush the SMTP |
406 | output because a callout might take some time. When PIPELINING is active and | |
407 | there are many recipients, the total time for doing lots of callouts can add up | |
408 | and cause the client to time out. So in this case we forgo the PIPELINING | |
409 | optimization. */ | |
817d9f57 | 410 | |
193e3acd | 411 | if (smtp_out != NULL && !disable_callout_flush) mac_smtp_fflush(); |
059ec3d9 | 412 | |
5032d1cf JH |
413 | /* cutthrough-multi: if a nonfirst rcpt has the same routing as the first, |
414 | and we are holding a cutthrough conn open, we can just append the rcpt to | |
415 | that conn for verification purposes (and later delivery also). Simplest | |
416 | coding means skipping this whole loop and doing the append separately. | |
417 | ||
418 | We will need to remember it has been appended so that rcpt-acl tail code | |
419 | can do it there for the non-rcpt-verify case. For this we keep an addresscount. | |
420 | */ | |
421 | ||
422 | /* Can we re-use an open cutthrough connection? */ | |
423 | if ( cutthrough.fd >= 0 | |
424 | && (options & (vopt_callout_recipsender | vopt_callout_recippmaster)) | |
425 | == vopt_callout_recipsender | |
426 | && !random_local_part | |
427 | && !pm_mailfrom | |
428 | ) | |
429 | { | |
430 | if (addr->transport == cutthrough.addr.transport) | |
431 | for (host = host_list; host; host = host->next) | |
432 | if (Ustrcmp(host->address, cutthrough.host.address) == 0) | |
433 | { | |
434 | int host_af; | |
435 | uschar *interface = NULL; /* Outgoing interface to use; NULL => any */ | |
436 | int port = 25; | |
437 | ||
438 | deliver_host = host->name; | |
439 | deliver_host_address = host->address; | |
440 | deliver_host_port = host->port; | |
441 | deliver_domain = addr->domain; | |
442 | transport_name = addr->transport->name; | |
443 | ||
444 | host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6; | |
445 | ||
446 | if (!smtp_get_interface(tf->interface, host_af, addr, NULL, &interface, | |
447 | US"callout") || | |
448 | !smtp_get_port(tf->port, addr, &port, US"callout")) | |
449 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address, | |
450 | addr->message); | |
451 | ||
452 | if ( ( interface == cutthrough.interface | |
453 | || ( interface | |
454 | && cutthrough.interface | |
455 | && Ustrcmp(interface, cutthrough.interface) == 0 | |
456 | ) ) | |
457 | && port == cutthrough.host.port | |
458 | ) | |
459 | { | |
460 | uschar * resp; | |
461 | ||
462 | /* Match! Send the RCPT TO, append the addr, set done */ | |
463 | done = | |
464 | smtp_write_command(&ctblock, FALSE, "RCPT TO:<%.1000s>\r\n", | |
465 | transport_rcpt_address(addr, | |
466 | (addr->transport == NULL)? FALSE : | |
467 | addr->transport->rcpt_include_affixes)) >= 0 && | |
468 | cutthrough_response('2', &resp) == '2'; | |
469 | ||
470 | /* This would go horribly wrong if a callout fail was ignored by ACL. | |
471 | We punt by abandoning cutthrough on a reject, like the | |
472 | first-rcpt does. */ | |
473 | ||
474 | if (done) | |
475 | { | |
476 | address_item * na = store_get(sizeof(address_item)); | |
477 | *na = cutthrough.addr; | |
478 | cutthrough.addr = *addr; | |
479 | cutthrough.addr.host_used = &cutthrough.host; | |
480 | cutthrough.addr.next = na; | |
481 | ||
482 | cutthrough.nrcpt++; | |
483 | } | |
484 | else | |
485 | { | |
486 | cancel_cutthrough_connection("recipient rejected"); | |
487 | if (errno == ETIMEDOUT) | |
488 | { | |
489 | HDEBUG(D_verify) debug_printf("SMTP timeout\n"); | |
490 | } | |
491 | else if (errno == 0) | |
492 | { | |
493 | if (*resp == 0) | |
494 | Ustrcpy(resp, US"connection dropped"); | |
495 | ||
496 | addr->message = | |
497 | string_sprintf("response to \"%s\" from %s [%s] was: %s", | |
498 | big_buffer, host->name, host->address, | |
499 | string_printing(resp)); | |
500 | ||
501 | addr->user_message = | |
502 | string_sprintf("Callout verification failed:\n%s", resp); | |
503 | ||
504 | /* Hard rejection ends the process */ | |
505 | ||
506 | if (resp[0] == '5') /* Address rejected */ | |
507 | { | |
508 | yield = FAIL; | |
509 | done = TRUE; | |
510 | } | |
511 | } | |
512 | } | |
513 | } | |
514 | break; | |
515 | } | |
516 | if (!done) | |
517 | cancel_cutthrough_connection("incompatible connection"); | |
518 | } | |
519 | ||
193e3acd JH |
520 | /* Now make connections to the hosts and do real callouts. The list of hosts |
521 | is passed in as an argument. */ | |
059ec3d9 | 522 | |
193e3acd | 523 | for (host = host_list; host != NULL && !done; host = host->next) |
059ec3d9 | 524 | { |
193e3acd JH |
525 | smtp_inblock inblock; |
526 | smtp_outblock outblock; | |
527 | int host_af; | |
528 | int port = 25; | |
529 | BOOL send_quit = TRUE; | |
530 | uschar *active_hostname = smtp_active_hostname; | |
531 | BOOL lmtp; | |
532 | BOOL smtps; | |
533 | BOOL esmtp; | |
534 | BOOL suppress_tls = FALSE; | |
535 | uschar *interface = NULL; /* Outgoing interface to use; NULL => any */ | |
0e66b3b6 JH |
536 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE) |
537 | BOOL dane = FALSE; | |
538 | dns_answer tlsa_dnsa; | |
539 | #endif | |
193e3acd JH |
540 | uschar inbuffer[4096]; |
541 | uschar outbuffer[1024]; | |
542 | uschar responsebuffer[4096]; | |
543 | ||
544 | clearflag(addr, af_verify_pmfail); /* postmaster callout flag */ | |
545 | clearflag(addr, af_verify_nsfail); /* null sender callout flag */ | |
546 | ||
547 | /* Skip this host if we don't have an IP address for it. */ | |
548 | ||
549 | if (host->address == NULL) | |
550 | { | |
551 | DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n", | |
552 | host->name); | |
553 | continue; | |
554 | } | |
059ec3d9 | 555 | |
193e3acd | 556 | /* Check the overall callout timeout */ |
059ec3d9 | 557 | |
193e3acd JH |
558 | if (time(NULL) - callout_start_time >= callout_overall) |
559 | { | |
560 | HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n"); | |
561 | break; | |
562 | } | |
059ec3d9 | 563 | |
193e3acd | 564 | /* Set IPv4 or IPv6 */ |
059ec3d9 | 565 | |
193e3acd | 566 | host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6; |
de3a88fb | 567 | |
193e3acd JH |
568 | /* Expand and interpret the interface and port strings. The latter will not |
569 | be used if there is a host-specific port (e.g. from a manualroute router). | |
570 | This has to be delayed till now, because they may expand differently for | |
571 | different hosts. If there's a failure, log it, but carry on with the | |
572 | defaults. */ | |
de3a88fb | 573 | |
193e3acd JH |
574 | deliver_host = host->name; |
575 | deliver_host_address = host->address; | |
a7538db1 | 576 | deliver_host_port = host->port; |
193e3acd | 577 | deliver_domain = addr->domain; |
aec45841 | 578 | transport_name = addr->transport->name; |
059ec3d9 | 579 | |
193e3acd JH |
580 | if (!smtp_get_interface(tf->interface, host_af, addr, NULL, &interface, |
581 | US"callout") || | |
582 | !smtp_get_port(tf->port, addr, &port, US"callout")) | |
583 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address, | |
584 | addr->message); | |
059ec3d9 | 585 | |
193e3acd JH |
586 | /* Set HELO string according to the protocol */ |
587 | lmtp= Ustrcmp(tf->protocol, "lmtp") == 0; | |
588 | smtps= Ustrcmp(tf->protocol, "smtps") == 0; | |
059ec3d9 | 589 | |
059ec3d9 | 590 | |
193e3acd | 591 | HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port); |
059ec3d9 | 592 | |
0e66b3b6 JH |
593 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE) |
594 | { | |
595 | BOOL dane_required; | |
596 | int rc; | |
597 | ||
598 | tls_out.dane_verified = FALSE; | |
599 | tls_out.tlsa_usage = 0; | |
600 | ||
5130845b JH |
601 | dane_required = |
602 | verify_check_given_host(&ob->hosts_require_dane, host) == OK; | |
0e66b3b6 JH |
603 | |
604 | if (host->dnssec == DS_YES) | |
605 | { | |
606 | if( dane_required | |
5130845b | 607 | || verify_check_given_host(&ob->hosts_try_dane, host) == OK |
0e66b3b6 JH |
608 | ) |
609 | if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK) | |
610 | return rc; | |
611 | } | |
612 | else if (dane_required) | |
613 | { | |
614 | log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name); | |
615 | return FAIL; | |
616 | } | |
617 | ||
618 | if (dane) | |
619 | ob->tls_tempfail_tryclear = FALSE; | |
620 | } | |
621 | #endif /*DANE*/ | |
622 | ||
193e3acd | 623 | /* Set up the buffer for reading SMTP response packets. */ |
059ec3d9 | 624 | |
193e3acd JH |
625 | inblock.buffer = inbuffer; |
626 | inblock.buffersize = sizeof(inbuffer); | |
627 | inblock.ptr = inbuffer; | |
628 | inblock.ptrend = inbuffer; | |
059ec3d9 | 629 | |
193e3acd | 630 | /* Set up the buffer for holding SMTP commands while pipelining */ |
817d9f57 | 631 | |
193e3acd JH |
632 | outblock.buffer = outbuffer; |
633 | outblock.buffersize = sizeof(outbuffer); | |
634 | outblock.ptr = outbuffer; | |
635 | outblock.cmd_count = 0; | |
636 | outblock.authenticating = FALSE; | |
059ec3d9 | 637 | |
193e3acd JH |
638 | /* Reset the parameters of a TLS session */ |
639 | tls_out.cipher = tls_out.peerdn = NULL; | |
817d9f57 | 640 | |
193e3acd JH |
641 | /* Connect to the host; on failure, just loop for the next one, but we |
642 | set the error for the last one. Use the callout_connect timeout. */ | |
059ec3d9 | 643 | |
193e3acd | 644 | tls_retry_connection: |
41c7c167 | 645 | |
193e3acd | 646 | inblock.sock = outblock.sock = |
a7538db1 | 647 | smtp_connect(host, host_af, port, interface, callout_connect, TRUE, NULL |
774ef2d7 JH |
648 | #ifdef EXPERIMENTAL_EVENT |
649 | /*XXX event action? NULL for now. */ | |
a7538db1 JH |
650 | , NULL |
651 | #endif | |
652 | ); | |
193e3acd JH |
653 | /* reconsider DSCP here */ |
654 | if (inblock.sock < 0) | |
655 | { | |
656 | addr->message = string_sprintf("could not connect to %s [%s]: %s", | |
657 | host->name, host->address, strerror(errno)); | |
aec45841 | 658 | transport_name = NULL; |
193e3acd JH |
659 | deliver_host = deliver_host_address = NULL; |
660 | deliver_domain = save_deliver_domain; | |
661 | continue; | |
662 | } | |
41c7c167 | 663 | |
193e3acd | 664 | /* Expand the helo_data string to find the host name to use. */ |
41c7c167 | 665 | |
193e3acd JH |
666 | if (tf->helo_data != NULL) |
667 | { | |
668 | uschar *s = expand_string(tf->helo_data); | |
669 | if (s == NULL) | |
670 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: failed to expand transport's " | |
671 | "helo_data value for callout: %s", addr->address, | |
672 | expand_string_message); | |
673 | else active_hostname = s; | |
674 | } | |
059ec3d9 | 675 | |
193e3acd JH |
676 | /* Wait for initial response, and send HELO. The smtp_write_command() |
677 | function leaves its command in big_buffer. This is used in error responses. | |
678 | Initialize it in case the connection is rejected. */ | |
817d9f57 | 679 | |
193e3acd | 680 | Ustrcpy(big_buffer, "initial connection"); |
817d9f57 | 681 | |
193e3acd JH |
682 | /* Unless ssl-on-connect, wait for the initial greeting */ |
683 | smtps_redo_greeting: | |
817d9f57 | 684 | |
a7538db1 | 685 | #ifdef SUPPORT_TLS |
193e3acd | 686 | if (!smtps || (smtps && tls_out.active >= 0)) |
a7538db1 JH |
687 | #endif |
688 | { | |
193e3acd JH |
689 | if (!(done= smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), '2', callout))) |
690 | goto RESPONSE_FAILED; | |
770747fd | 691 | |
774ef2d7 | 692 | #ifdef EXPERIMENTAL_EVENT |
aaedd1b5 JH |
693 | lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes" |
694 | : host->dnssec==DS_NO ? US"no" : NULL; | |
774ef2d7 | 695 | if (event_raise(addr->transport->event_action, |
b30275b8 | 696 | US"smtp:connect", responsebuffer)) |
a7538db1 | 697 | { |
aaedd1b5 | 698 | lookup_dnssec_authenticated = NULL; |
a7538db1 JH |
699 | /* Logging? Debug? */ |
700 | goto RESPONSE_FAILED; | |
701 | } | |
aaedd1b5 | 702 | lookup_dnssec_authenticated = NULL; |
a7538db1 JH |
703 | #endif |
704 | } | |
705 | ||
193e3acd | 706 | /* Not worth checking greeting line for ESMTP support */ |
5130845b | 707 | if (!(esmtp = verify_check_given_host(&(ob->hosts_avoid_esmtp), host) != OK)) |
193e3acd JH |
708 | DEBUG(D_transport) |
709 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); | |
817d9f57 | 710 | |
193e3acd | 711 | tls_redo_helo: |
817d9f57 | 712 | |
a7538db1 | 713 | #ifdef SUPPORT_TLS |
193e3acd | 714 | if (smtps && tls_out.active < 0) /* ssl-on-connect, first pass */ |
817d9f57 | 715 | { |
193e3acd JH |
716 | tls_offered = TRUE; |
717 | ob->tls_tempfail_tryclear = FALSE; | |
817d9f57 | 718 | } |
a7538db1 JH |
719 | else /* all other cases */ |
720 | #endif | |
817d9f57 | 721 | |
193e3acd | 722 | { esmtp_retry: |
817d9f57 | 723 | |
193e3acd JH |
724 | if (!(done= smtp_write_command(&outblock, FALSE, "%s %s\r\n", |
725 | !esmtp? "HELO" : lmtp? "LHLO" : "EHLO", active_hostname) >= 0)) | |
726 | goto SEND_FAILED; | |
727 | if (!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), '2', callout)) | |
728 | { | |
4ed8d31a JH |
729 | if (errno != 0 || responsebuffer[0] == 0 || lmtp || !esmtp || tls_out.active >= 0) |
730 | { | |
731 | done= FALSE; | |
732 | goto RESPONSE_FAILED; | |
733 | } | |
a7538db1 | 734 | #ifdef SUPPORT_TLS |
193e3acd | 735 | tls_offered = FALSE; |
a7538db1 | 736 | #endif |
193e3acd JH |
737 | esmtp = FALSE; |
738 | goto esmtp_retry; /* fallback to HELO */ | |
739 | } | |
740 | ||
741 | /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */ | |
a7538db1 | 742 | #ifdef SUPPORT_TLS |
4ed8d31a | 743 | if (esmtp && !suppress_tls && tls_out.active < 0) |
a7538db1 JH |
744 | { |
745 | if (regex_STARTTLS == NULL) regex_STARTTLS = | |
746 | regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE); | |
4ed8d31a | 747 | |
a7538db1 JH |
748 | tls_offered = pcre_exec(regex_STARTTLS, NULL, CS responsebuffer, |
749 | Ustrlen(responsebuffer), 0, PCRE_EOPT, NULL, 0) >= 0; | |
4ed8d31a JH |
750 | } |
751 | else | |
752 | tls_offered = FALSE; | |
a7538db1 | 753 | #endif |
817d9f57 JH |
754 | } |
755 | ||
193e3acd JH |
756 | /* If TLS is available on this connection attempt to |
757 | start up a TLS session, unless the host is in hosts_avoid_tls. If successful, | |
758 | send another EHLO - the server may give a different answer in secure mode. We | |
759 | use a separate buffer for reading the response to STARTTLS so that if it is | |
760 | negative, the original EHLO data is available for subsequent analysis, should | |
761 | the client not be required to use TLS. If the response is bad, copy the buffer | |
762 | for error analysis. */ | |
763 | ||
a7538db1 | 764 | #ifdef SUPPORT_TLS |
5130845b JH |
765 | if ( tls_offered |
766 | && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK | |
767 | && verify_check_given_host(&ob->hosts_verify_avoid_tls, host) != OK | |
99400968 | 768 | ) |
817d9f57 | 769 | { |
193e3acd JH |
770 | uschar buffer2[4096]; |
771 | if ( !smtps | |
772 | && !(done= smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") >= 0)) | |
773 | goto SEND_FAILED; | |
774 | ||
775 | /* If there is an I/O error, transmission of this message is deferred. If | |
776 | there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is | |
777 | false, we also defer. However, if there is a temporary rejection of STARTTLS | |
778 | and tls_tempfail_tryclear is true, or if there is an outright rejection of | |
779 | STARTTLS, we carry on. This means we will try to send the message in clear, | |
780 | unless the host is in hosts_require_tls (tested below). */ | |
781 | ||
782 | if (!smtps && !smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2', | |
783 | ob->command_timeout)) | |
817d9f57 | 784 | { |
193e3acd JH |
785 | if (errno != 0 || buffer2[0] == 0 || |
786 | (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)) | |
a7538db1 JH |
787 | { |
788 | Ustrncpy(responsebuffer, buffer2, sizeof(responsebuffer)); | |
789 | done= FALSE; | |
790 | goto RESPONSE_FAILED; | |
791 | } | |
193e3acd | 792 | } |
817d9f57 | 793 | |
193e3acd JH |
794 | /* STARTTLS accepted or ssl-on-connect: try to negotiate a TLS session. */ |
795 | else | |
796 | { | |
65867078 JH |
797 | int oldtimeout = ob->command_timeout; |
798 | int rc; | |
799 | ||
800 | ob->command_timeout = callout; | |
0e66b3b6 | 801 | rc = tls_client_start(inblock.sock, host, addr, addr->transport |
5032d1cf | 802 | # ifdef EXPERIMENTAL_DANE |
0e66b3b6 | 803 | , dane ? &tlsa_dnsa : NULL |
5032d1cf | 804 | # endif |
0e66b3b6 | 805 | ); |
65867078 | 806 | ob->command_timeout = oldtimeout; |
193e3acd JH |
807 | |
808 | /* TLS negotiation failed; give an error. Try in clear on a new connection, | |
809 | if the options permit it for this host. */ | |
810 | if (rc != OK) | |
83b27293 | 811 | { |
a1bccd48 JH |
812 | if ( rc == DEFER |
813 | && ob->tls_tempfail_tryclear | |
814 | && !smtps | |
5130845b | 815 | && verify_check_given_host(&ob->hosts_require_tls, host) != OK |
a1bccd48 JH |
816 | ) |
817 | { | |
83b27293 | 818 | (void)close(inblock.sock); |
5032d1cf | 819 | # ifdef EXPERIMENTAL_EVENT |
774ef2d7 | 820 | (void) event_raise(addr->transport->event_action, |
83b27293 | 821 | US"tcp:close", NULL); |
5032d1cf | 822 | # endif |
a7538db1 JH |
823 | log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted " |
824 | "to %s [%s] (not in hosts_require_tls)", host->name, host->address); | |
825 | suppress_tls = TRUE; | |
826 | goto tls_retry_connection; | |
827 | } | |
828 | /*save_errno = ERRNO_TLSFAILURE;*/ | |
829 | /*message = US"failure while setting up TLS session";*/ | |
830 | send_quit = FALSE; | |
831 | done= FALSE; | |
832 | goto TLS_FAILED; | |
833 | } | |
193e3acd JH |
834 | |
835 | /* TLS session is set up. Copy info for logging. */ | |
836 | addr->cipher = tls_out.cipher; | |
837 | addr->peerdn = tls_out.peerdn; | |
838 | ||
839 | /* For SMTPS we need to wait for the initial OK response, then do HELO. */ | |
840 | if (smtps) | |
a7538db1 | 841 | goto smtps_redo_greeting; |
193e3acd JH |
842 | |
843 | /* For STARTTLS we need to redo EHLO */ | |
844 | goto tls_redo_helo; | |
845 | } | |
817d9f57 JH |
846 | } |
847 | ||
193e3acd JH |
848 | /* If the host is required to use a secure channel, ensure that we have one. */ |
849 | if (tls_out.active < 0) | |
0e66b3b6 | 850 | if ( |
5032d1cf | 851 | # ifdef EXPERIMENTAL_DANE |
0e66b3b6 | 852 | dane || |
5032d1cf | 853 | # endif |
5130845b | 854 | verify_check_given_host(&ob->hosts_require_tls, host) == OK |
7a31d643 | 855 | ) |
193e3acd JH |
856 | { |
857 | /*save_errno = ERRNO_TLSREQUIRED;*/ | |
c562fd30 JH |
858 | log_write(0, LOG_MAIN, |
859 | "H=%s [%s]: a TLS session is required for this host, but %s", | |
193e3acd | 860 | host->name, host->address, |
c562fd30 JH |
861 | tls_offered ? "an attempt to start TLS failed" |
862 | : "the server did not offer TLS support"); | |
193e3acd JH |
863 | done= FALSE; |
864 | goto TLS_FAILED; | |
865 | } | |
817d9f57 | 866 | |
5032d1cf | 867 | #endif /*SUPPORT_TLS*/ |
817d9f57 | 868 | |
193e3acd | 869 | done = TRUE; /* so far so good; have response to HELO */ |
817d9f57 | 870 | |
d6e96b36 | 871 | /*XXX the EHLO response would be analyzed here for IGNOREQUOTA, SIZE, PIPELINING */ |
817d9f57 | 872 | |
d6e96b36 | 873 | /* For now, transport_filter by cutthrough-delivery is not supported */ |
193e3acd | 874 | /* Need proper integration with the proper transport mechanism. */ |
5032d1cf | 875 | if (cutthrough.delivery) |
d6e96b36 | 876 | { |
6e62c454 JH |
877 | if (addr->transport->filter_command) |
878 | { | |
5032d1cf | 879 | cutthrough.delivery = FALSE; |
6e62c454 JH |
880 | HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of transport filter\n"); |
881 | } | |
a7538db1 | 882 | #ifndef DISABLE_DKIM |
6e62c454 JH |
883 | if (ob->dkim_domain) |
884 | { | |
5032d1cf | 885 | cutthrough.delivery = FALSE; |
6e62c454 JH |
886 | HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of DKIM signing\n"); |
887 | } | |
a7538db1 | 888 | #endif |
d6e96b36 | 889 | } |
817d9f57 | 890 | |
193e3acd JH |
891 | SEND_FAILED: |
892 | RESPONSE_FAILED: | |
893 | TLS_FAILED: | |
894 | ; | |
895 | /* Clear down of the TLS, SMTP and TCP layers on error is handled below. */ | |
059ec3d9 | 896 | |
193e3acd JH |
897 | /* Failure to accept HELO is cached; this blocks the whole domain for all |
898 | senders. I/O errors and defer responses are not cached. */ | |
899 | ||
900 | if (!done) | |
2b1c6e3a | 901 | { |
193e3acd JH |
902 | *failure_ptr = US"mail"; /* At or before MAIL */ |
903 | if (errno == 0 && responsebuffer[0] == '5') | |
904 | { | |
905 | setflag(addr, af_verify_nsfail); | |
906 | new_domain_record.result = ccache_reject; | |
907 | } | |
2b1c6e3a | 908 | } |
2b1c6e3a | 909 | |
d6e96b36 | 910 | /* If we haven't authenticated, but are required to, give up. */ |
fcc8e047 JH |
911 | /* Try to AUTH */ |
912 | ||
913 | else done = smtp_auth(responsebuffer, sizeof(responsebuffer), | |
914 | addr, host, ob, esmtp, &inblock, &outblock) == OK && | |
915 | ||
b4a2b536 JH |
916 | /* Copy AUTH info for logging */ |
917 | ( (addr->authenticator = client_authenticator), | |
918 | (addr->auth_id = client_authenticated_id), | |
919 | ||
fcc8e047 | 920 | /* Build a mail-AUTH string (re-using responsebuffer for convenience */ |
b4a2b536 JH |
921 | !smtp_mail_auth_str(responsebuffer, sizeof(responsebuffer), addr, ob) |
922 | ) && | |
923 | ||
924 | ( (addr->auth_sndr = client_authenticated_sender), | |
fcc8e047 | 925 | |
193e3acd | 926 | /* Send the MAIL command */ |
b4a2b536 JH |
927 | (smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>%s\r\n", |
928 | from_address, responsebuffer) >= 0) | |
929 | ) && | |
2b1c6e3a | 930 | |
193e3acd JH |
931 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), |
932 | '2', callout); | |
059ec3d9 | 933 | |
00bff6f6 JH |
934 | deliver_host = deliver_host_address = NULL; |
935 | deliver_domain = save_deliver_domain; | |
936 | ||
193e3acd JH |
937 | /* If the host does not accept MAIL FROM:<>, arrange to cache this |
938 | information, but again, don't record anything for an I/O error or a defer. Do | |
939 | not cache rejections of MAIL when a non-empty sender has been used, because | |
940 | that blocks the whole domain for all senders. */ | |
059ec3d9 | 941 | |
193e3acd | 942 | if (!done) |
059ec3d9 | 943 | { |
193e3acd JH |
944 | *failure_ptr = US"mail"; /* At or before MAIL */ |
945 | if (errno == 0 && responsebuffer[0] == '5') | |
946 | { | |
947 | setflag(addr, af_verify_nsfail); | |
948 | if (from_address[0] == 0) | |
949 | new_domain_record.result = ccache_reject_mfnull; | |
950 | } | |
059ec3d9 | 951 | } |
059ec3d9 | 952 | |
193e3acd JH |
953 | /* Otherwise, proceed to check a "random" address (if required), then the |
954 | given address, and the postmaster address (if required). Between each check, | |
955 | issue RSET, because some servers accept only one recipient after MAIL | |
956 | FROM:<>. | |
2b1c6e3a | 957 | |
193e3acd JH |
958 | Before doing this, set the result in the domain cache record to "accept", |
959 | unless its previous value was ccache_reject_mfnull. In that case, the domain | |
960 | rejects MAIL FROM:<> and we want to continue to remember that. When that is | |
961 | the case, we have got here only in the case of a recipient verification with | |
962 | a non-null sender. */ | |
059ec3d9 | 963 | |
193e3acd | 964 | else |
059ec3d9 | 965 | { |
193e3acd JH |
966 | new_domain_record.result = |
967 | (old_domain_cache_result == ccache_reject_mfnull)? | |
968 | ccache_reject_mfnull: ccache_accept; | |
059ec3d9 | 969 | |
193e3acd | 970 | /* Do the random local part check first */ |
059ec3d9 | 971 | |
193e3acd | 972 | if (random_local_part != NULL) |
059ec3d9 | 973 | { |
193e3acd JH |
974 | uschar randombuffer[1024]; |
975 | BOOL random_ok = | |
976 | smtp_write_command(&outblock, FALSE, | |
977 | "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part, | |
978 | addr->domain) >= 0 && | |
979 | smtp_read_response(&inblock, randombuffer, | |
980 | sizeof(randombuffer), '2', callout); | |
059ec3d9 | 981 | |
193e3acd | 982 | /* Remember when we last did a random test */ |
059ec3d9 | 983 | |
193e3acd | 984 | new_domain_record.random_stamp = time(NULL); |
059ec3d9 | 985 | |
193e3acd | 986 | /* If accepted, we aren't going to do any further tests below. */ |
059ec3d9 | 987 | |
193e3acd | 988 | if (random_ok) |
193e3acd | 989 | new_domain_record.random_result = ccache_accept; |
059ec3d9 | 990 | |
193e3acd JH |
991 | /* Otherwise, cache a real negative response, and get back to the right |
992 | state to send RCPT. Unless there's some problem such as a dropped | |
993 | connection, we expect to succeed, because the commands succeeded above. */ | |
059ec3d9 | 994 | |
193e3acd JH |
995 | else if (errno == 0) |
996 | { | |
5032d1cf JH |
997 | cancel_cutthrough_connection("random-recipient"); |
998 | ||
193e3acd JH |
999 | if (randombuffer[0] == '5') |
1000 | new_domain_record.random_result = ccache_reject; | |
1001 | ||
1002 | done = | |
1003 | smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 && | |
1004 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), | |
1005 | '2', callout) && | |
1006 | ||
1007 | smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n", | |
1008 | from_address) >= 0 && | |
1009 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), | |
1010 | '2', callout); | |
1011 | } | |
1012 | else done = FALSE; /* Some timeout/connection problem */ | |
1013 | } /* Random check */ | |
059ec3d9 | 1014 | |
193e3acd JH |
1015 | /* If the host is accepting all local parts, as determined by the "random" |
1016 | check, we don't need to waste time doing any further checking. */ | |
059ec3d9 | 1017 | |
193e3acd | 1018 | if (new_domain_record.random_result != ccache_accept && done) |
059ec3d9 | 1019 | { |
193e3acd JH |
1020 | /* Get the rcpt_include_affixes flag from the transport if there is one, |
1021 | but assume FALSE if there is not. */ | |
e4bdf652 | 1022 | |
059ec3d9 | 1023 | done = |
193e3acd JH |
1024 | smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n", |
1025 | transport_rcpt_address(addr, | |
1026 | (addr->transport == NULL)? FALSE : | |
1027 | addr->transport->rcpt_include_affixes)) >= 0 && | |
1028 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), | |
1029 | '2', callout); | |
059ec3d9 | 1030 | |
193e3acd JH |
1031 | if (done) |
1032 | new_address_record.result = ccache_accept; | |
1033 | else if (errno == 0 && responsebuffer[0] == '5') | |
1034 | { | |
1035 | *failure_ptr = US"recipient"; | |
1036 | new_address_record.result = ccache_reject; | |
1037 | } | |
059ec3d9 | 1038 | |
193e3acd JH |
1039 | /* Do postmaster check if requested; if a full check is required, we |
1040 | check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */ | |
2a4be8f9 | 1041 | |
193e3acd JH |
1042 | if (done && pm_mailfrom != NULL) |
1043 | { | |
5032d1cf JH |
1044 | /*XXX not suitable for cutthrough - we cannot afford to do an RSET |
1045 | and lose the original mail-from */ | |
1046 | cancel_cutthrough_connection("postmaster verify"); | |
193e3acd JH |
1047 | HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of postmaster verify\n"); |
1048 | ||
1049 | done = | |
1050 | smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 && | |
1051 | smtp_read_response(&inblock, responsebuffer, | |
1052 | sizeof(responsebuffer), '2', callout) && | |
1053 | ||
1054 | smtp_write_command(&outblock, FALSE, | |
1055 | "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 && | |
1056 | smtp_read_response(&inblock, responsebuffer, | |
1057 | sizeof(responsebuffer), '2', callout) && | |
1058 | ||
1059 | /* First try using the current domain */ | |
1060 | ||
1061 | (( | |
1062 | smtp_write_command(&outblock, FALSE, | |
1063 | "RCPT TO:<postmaster@%.1000s>\r\n", addr->domain) >= 0 && | |
1064 | smtp_read_response(&inblock, responsebuffer, | |
1065 | sizeof(responsebuffer), '2', callout) | |
1066 | ) | |
1067 | ||
1068 | || | |
1069 | ||
1070 | /* If that doesn't work, and a full check is requested, | |
1071 | try without the domain. */ | |
1072 | ||
1073 | ( | |
1074 | (options & vopt_callout_fullpm) != 0 && | |
1075 | smtp_write_command(&outblock, FALSE, | |
1076 | "RCPT TO:<postmaster>\r\n") >= 0 && | |
1077 | smtp_read_response(&inblock, responsebuffer, | |
1078 | sizeof(responsebuffer), '2', callout) | |
1079 | )); | |
1080 | ||
1081 | /* Sort out the cache record */ | |
1082 | ||
1083 | new_domain_record.postmaster_stamp = time(NULL); | |
1084 | ||
1085 | if (done) | |
1086 | new_domain_record.postmaster_result = ccache_accept; | |
1087 | else if (errno == 0 && responsebuffer[0] == '5') | |
1088 | { | |
1089 | *failure_ptr = US"postmaster"; | |
1090 | setflag(addr, af_verify_pmfail); | |
1091 | new_domain_record.postmaster_result = ccache_reject; | |
1092 | } | |
1093 | } | |
1094 | } /* Random not accepted */ | |
1095 | } /* MAIL FROM: accepted */ | |
2a4be8f9 | 1096 | |
193e3acd JH |
1097 | /* For any failure of the main check, other than a negative response, we just |
1098 | close the connection and carry on. We can identify a negative response by the | |
1099 | fact that errno is zero. For I/O errors it will be non-zero | |
2a4be8f9 | 1100 | |
193e3acd JH |
1101 | Set up different error texts for logging and for sending back to the caller |
1102 | as an SMTP response. Log in all cases, using a one-line format. For sender | |
1103 | callouts, give a full response to the caller, but for recipient callouts, | |
1104 | don't give the IP address because this may be an internal host whose identity | |
1105 | is not to be widely broadcast. */ | |
2a4be8f9 | 1106 | |
193e3acd JH |
1107 | if (!done) |
1108 | { | |
1109 | if (errno == ETIMEDOUT) | |
1110 | { | |
1111 | HDEBUG(D_verify) debug_printf("SMTP timeout\n"); | |
1112 | send_quit = FALSE; | |
1113 | } | |
1114 | else if (errno == 0) | |
1115 | { | |
1116 | if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped"); | |
2a4be8f9 | 1117 | |
193e3acd JH |
1118 | addr->message = |
1119 | string_sprintf("response to \"%s\" from %s [%s] was: %s", | |
1120 | big_buffer, host->name, host->address, | |
1121 | string_printing(responsebuffer)); | |
059ec3d9 | 1122 | |
193e3acd JH |
1123 | addr->user_message = is_recipient? |
1124 | string_sprintf("Callout verification failed:\n%s", responsebuffer) | |
1125 | : | |
1126 | string_sprintf("Called: %s\nSent: %s\nResponse: %s", | |
1127 | host->address, big_buffer, responsebuffer); | |
059ec3d9 | 1128 | |
193e3acd JH |
1129 | /* Hard rejection ends the process */ |
1130 | ||
1131 | if (responsebuffer[0] == '5') /* Address rejected */ | |
059ec3d9 | 1132 | { |
193e3acd JH |
1133 | yield = FAIL; |
1134 | done = TRUE; | |
059ec3d9 PH |
1135 | } |
1136 | } | |
193e3acd | 1137 | } |
059ec3d9 | 1138 | |
193e3acd JH |
1139 | /* End the SMTP conversation and close the connection. */ |
1140 | ||
5032d1cf JH |
1141 | /* Cutthrough - on a successfull connect and recipient-verify with |
1142 | use-sender and we are 1st rcpt and have no cutthrough conn so far | |
193e3acd | 1143 | here is where we want to leave the conn open */ |
5032d1cf JH |
1144 | if ( cutthrough.delivery |
1145 | && rcpt_count == 1 | |
193e3acd JH |
1146 | && done |
1147 | && yield == OK | |
1148 | && (options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == vopt_callout_recipsender | |
1149 | && !random_local_part | |
1150 | && !pm_mailfrom | |
5032d1cf | 1151 | && cutthrough.fd < 0 |
193e3acd | 1152 | ) |
059ec3d9 | 1153 | { |
5032d1cf JH |
1154 | cutthrough.fd = outblock.sock; /* We assume no buffer in use in the outblock */ |
1155 | cutthrough.nrcpt = 1; | |
1156 | cutthrough.interface = interface; | |
1157 | cutthrough.host = *host; | |
1158 | cutthrough.addr = *addr; /* Save the address_item for later logging */ | |
1159 | cutthrough.addr.next = NULL; | |
1160 | cutthrough.addr.host_used = &cutthrough.host; | |
193e3acd | 1161 | if (addr->parent) |
5032d1cf JH |
1162 | *(cutthrough.addr.parent = store_get(sizeof(address_item))) = |
1163 | *addr->parent; | |
193e3acd JH |
1164 | ctblock.buffer = ctbuffer; |
1165 | ctblock.buffersize = sizeof(ctbuffer); | |
1166 | ctblock.ptr = ctbuffer; | |
1167 | /* ctblock.cmd_count = 0; ctblock.authenticating = FALSE; */ | |
5032d1cf | 1168 | ctblock.sock = cutthrough.fd; |
059ec3d9 | 1169 | } |
193e3acd | 1170 | else |
059ec3d9 | 1171 | { |
2e5b33cd | 1172 | /* Ensure no cutthrough on multiple address verifies */ |
193e3acd | 1173 | if (options & vopt_callout_recipsender) |
2e5b33cd | 1174 | cancel_cutthrough_connection("multiple verify calls"); |
193e3acd | 1175 | if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); |
059ec3d9 | 1176 | |
a7538db1 | 1177 | #ifdef SUPPORT_TLS |
193e3acd | 1178 | tls_close(FALSE, TRUE); |
a7538db1 | 1179 | #endif |
193e3acd | 1180 | (void)close(inblock.sock); |
774ef2d7 JH |
1181 | #ifdef EXPERIMENTAL_EVENT |
1182 | (void) event_raise(addr->transport->event_action, | |
a7538db1 JH |
1183 | US"tcp:close", NULL); |
1184 | #endif | |
059ec3d9 | 1185 | } |
059ec3d9 | 1186 | |
193e3acd JH |
1187 | } /* Loop through all hosts, while !done */ |
1188 | } | |
059ec3d9 PH |
1189 | |
1190 | /* If we get here with done == TRUE, a successful callout happened, and yield | |
1191 | will be set OK or FAIL according to the response to the RCPT command. | |
1192 | Otherwise, we looped through the hosts but couldn't complete the business. | |
1193 | However, there may be domain-specific information to cache in both cases. | |
1194 | ||
1195 | The value of the result field in the new_domain record is ccache_unknown if | |
90e9ce59 | 1196 | there was an error before or with MAIL FROM:, and errno was not zero, |
059ec3d9 | 1197 | implying some kind of I/O error. We don't want to write the cache in that case. |
2b1c6e3a | 1198 | Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */ |
059ec3d9 PH |
1199 | |
1200 | if (!callout_no_cache && new_domain_record.result != ccache_unknown) | |
1201 | { | |
1202 | if ((dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE)) | |
1203 | == NULL) | |
1204 | { | |
1205 | HDEBUG(D_verify) debug_printf("callout cache: not available\n"); | |
1206 | } | |
1207 | else | |
1208 | { | |
1209 | (void)dbfn_write(dbm_file, addr->domain, &new_domain_record, | |
1210 | (int)sizeof(dbdata_callout_cache)); | |
1211 | HDEBUG(D_verify) debug_printf("wrote callout cache domain record:\n" | |
1212 | " result=%d postmaster=%d random=%d\n", | |
1213 | new_domain_record.result, | |
1214 | new_domain_record.postmaster_result, | |
1215 | new_domain_record.random_result); | |
1216 | } | |
1217 | } | |
1218 | ||
1219 | /* If a definite result was obtained for the callout, cache it unless caching | |
1220 | is disabled. */ | |
1221 | ||
1222 | if (done) | |
1223 | { | |
1224 | if (!callout_no_cache && new_address_record.result != ccache_unknown) | |
1225 | { | |
1226 | if (dbm_file == NULL) | |
1227 | dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE); | |
1228 | if (dbm_file == NULL) | |
1229 | { | |
1230 | HDEBUG(D_verify) debug_printf("no callout cache available\n"); | |
1231 | } | |
1232 | else | |
1233 | { | |
1234 | (void)dbfn_write(dbm_file, address_key, &new_address_record, | |
1235 | (int)sizeof(dbdata_callout_cache_address)); | |
1236 | HDEBUG(D_verify) debug_printf("wrote %s callout cache address record\n", | |
1237 | (new_address_record.result == ccache_accept)? "positive" : "negative"); | |
1238 | } | |
1239 | } | |
1240 | } /* done */ | |
1241 | ||
1242 | /* Failure to connect to any host, or any response other than 2xx or 5xx is a | |
1243 | temporary error. If there was only one host, and a response was received, leave | |
1244 | it alone if supplying details. Otherwise, give a generic response. */ | |
1245 | ||
1246 | else /* !done */ | |
1247 | { | |
1248 | uschar *dullmsg = string_sprintf("Could not complete %s verify callout", | |
1249 | is_recipient? "recipient" : "sender"); | |
1250 | yield = DEFER; | |
1251 | ||
1252 | if (host_list->next != NULL || addr->message == NULL) addr->message = dullmsg; | |
1253 | ||
1254 | addr->user_message = (!smtp_return_error_details)? dullmsg : | |
1255 | string_sprintf("%s for <%s>.\n" | |
1256 | "The mail server(s) for the domain may be temporarily unreachable, or\n" | |
1257 | "they may be permanently unreachable from this server. In the latter case,\n%s", | |
1258 | dullmsg, addr->address, | |
1259 | is_recipient? | |
1260 | "the address will never be accepted." | |
1261 | : | |
1262 | "you need to change the address or create an MX record for its domain\n" | |
1263 | "if it is supposed to be generally accessible from the Internet.\n" | |
1264 | "Talk to your mail administrator for details."); | |
1265 | ||
1266 | /* Force a specific error code */ | |
1267 | ||
1268 | addr->basic_errno = ERRNO_CALLOUTDEFER; | |
1269 | } | |
1270 | ||
1271 | /* Come here from within the cache-reading code on fast-track exit. */ | |
1272 | ||
1273 | END_CALLOUT: | |
1274 | if (dbm_file != NULL) dbfn_close(dbm_file); | |
1275 | return yield; | |
1276 | } | |
1277 | ||
1278 | ||
1279 | ||
817d9f57 JH |
1280 | /* Called after recipient-acl to get a cutthrough connection open when |
1281 | one was requested and a recipient-verify wasn't subsequently done. | |
1282 | */ | |
e4bdf652 JH |
1283 | void |
1284 | open_cutthrough_connection( address_item * addr ) | |
1285 | { | |
1286 | address_item addr2; | |
1287 | ||
1288 | /* Use a recipient-verify-callout to set up the cutthrough connection. */ | |
1289 | /* We must use a copy of the address for verification, because it might | |
1290 | get rewritten. */ | |
1291 | ||
1292 | addr2 = *addr; | |
5032d1cf JH |
1293 | HDEBUG(D_acl) debug_printf("----------- %s cutthrough setup ------------\n", |
1294 | rcpt_count > 1 ? "more" : "start"); | |
e4bdf652 JH |
1295 | (void) verify_address(&addr2, NULL, |
1296 | vopt_is_recipient | vopt_callout_recipsender | vopt_callout_no_cache, | |
1297 | CUTTHROUGH_CMD_TIMEOUT, -1, -1, | |
1298 | NULL, NULL, NULL); | |
1299 | HDEBUG(D_acl) debug_printf("----------- end cutthrough setup ------------\n"); | |
1300 | return; | |
1301 | } | |
1302 | ||
1303 | ||
e4bdf652 | 1304 | |
817d9f57 JH |
1305 | /* Send given number of bytes from the buffer */ |
1306 | static BOOL | |
1307 | cutthrough_send(int n) | |
e4bdf652 | 1308 | { |
5032d1cf | 1309 | if(cutthrough.fd < 0) |
817d9f57 | 1310 | return TRUE; |
e4bdf652 | 1311 | |
817d9f57 JH |
1312 | if( |
1313 | #ifdef SUPPORT_TLS | |
5032d1cf | 1314 | (tls_out.active == cutthrough.fd) ? tls_write(FALSE, ctblock.buffer, n) : |
817d9f57 | 1315 | #endif |
5032d1cf | 1316 | send(cutthrough.fd, ctblock.buffer, n, 0) > 0 |
817d9f57 JH |
1317 | ) |
1318 | { | |
1319 | transport_count += n; | |
1320 | ctblock.ptr= ctblock.buffer; | |
1321 | return TRUE; | |
1322 | } | |
e4bdf652 | 1323 | |
817d9f57 JH |
1324 | HDEBUG(D_transport|D_acl) debug_printf("cutthrough_send failed: %s\n", strerror(errno)); |
1325 | return FALSE; | |
e4bdf652 JH |
1326 | } |
1327 | ||
1328 | ||
1329 | ||
817d9f57 JH |
1330 | static BOOL |
1331 | _cutthrough_puts(uschar * cp, int n) | |
1332 | { | |
1333 | while(n--) | |
1334 | { | |
1335 | if(ctblock.ptr >= ctblock.buffer+ctblock.buffersize) | |
1336 | if(!cutthrough_send(ctblock.buffersize)) | |
1337 | return FALSE; | |
1338 | ||
1339 | *ctblock.ptr++ = *cp++; | |
1340 | } | |
1341 | return TRUE; | |
1342 | } | |
1343 | ||
1344 | /* Buffered output of counted data block. Return boolean success */ | |
e4bdf652 JH |
1345 | BOOL |
1346 | cutthrough_puts(uschar * cp, int n) | |
1347 | { | |
5032d1cf | 1348 | if (cutthrough.fd < 0) return TRUE; |
817d9f57 | 1349 | if (_cutthrough_puts(cp, n)) return TRUE; |
2e5b33cd | 1350 | cancel_cutthrough_connection("transmit failed"); |
817d9f57 JH |
1351 | return FALSE; |
1352 | } | |
e4bdf652 | 1353 | |
e4bdf652 | 1354 | |
817d9f57 | 1355 | static BOOL |
5032d1cf | 1356 | _cutthrough_flush_send(void) |
817d9f57 JH |
1357 | { |
1358 | int n= ctblock.ptr-ctblock.buffer; | |
e4bdf652 | 1359 | |
817d9f57 JH |
1360 | if(n>0) |
1361 | if(!cutthrough_send(n)) | |
1362 | return FALSE; | |
1363 | return TRUE; | |
e4bdf652 JH |
1364 | } |
1365 | ||
817d9f57 JH |
1366 | |
1367 | /* Send out any bufferred output. Return boolean success. */ | |
e4bdf652 | 1368 | BOOL |
5032d1cf | 1369 | cutthrough_flush_send(void) |
e4bdf652 | 1370 | { |
817d9f57 | 1371 | if (_cutthrough_flush_send()) return TRUE; |
2e5b33cd | 1372 | cancel_cutthrough_connection("transmit failed"); |
e4bdf652 JH |
1373 | return FALSE; |
1374 | } | |
1375 | ||
1376 | ||
1377 | BOOL | |
5032d1cf | 1378 | cutthrough_put_nl(void) |
e4bdf652 JH |
1379 | { |
1380 | return cutthrough_puts(US"\r\n", 2); | |
1381 | } | |
1382 | ||
1383 | ||
1384 | /* Get and check response from cutthrough target */ | |
1385 | static uschar | |
1386 | cutthrough_response(char expect, uschar ** copy) | |
1387 | { | |
1388 | smtp_inblock inblock; | |
1389 | uschar inbuffer[4096]; | |
1390 | uschar responsebuffer[4096]; | |
1391 | ||
1392 | inblock.buffer = inbuffer; | |
1393 | inblock.buffersize = sizeof(inbuffer); | |
1394 | inblock.ptr = inbuffer; | |
1395 | inblock.ptrend = inbuffer; | |
5032d1cf | 1396 | inblock.sock = cutthrough.fd; |
817d9f57 | 1397 | /* this relies on (inblock.sock == tls_out.active) */ |
e4bdf652 | 1398 | if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, CUTTHROUGH_DATA_TIMEOUT)) |
2e5b33cd | 1399 | cancel_cutthrough_connection("target timeout on read"); |
e4bdf652 JH |
1400 | |
1401 | if(copy != NULL) | |
1402 | { | |
1403 | uschar * cp; | |
5032d1cf | 1404 | *copy = cp = string_copy(responsebuffer); |
e4bdf652 JH |
1405 | /* Trim the trailing end of line */ |
1406 | cp += Ustrlen(responsebuffer); | |
1407 | if(cp > *copy && cp[-1] == '\n') *--cp = '\0'; | |
1408 | if(cp > *copy && cp[-1] == '\r') *--cp = '\0'; | |
1409 | } | |
1410 | ||
1411 | return responsebuffer[0]; | |
1412 | } | |
1413 | ||
1414 | ||
1415 | /* Negotiate dataphase with the cutthrough target, returning success boolean */ | |
1416 | BOOL | |
5032d1cf | 1417 | cutthrough_predata(void) |
e4bdf652 | 1418 | { |
5032d1cf | 1419 | if(cutthrough.fd < 0) |
e4bdf652 JH |
1420 | return FALSE; |
1421 | ||
1422 | HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> DATA\n"); | |
817d9f57 JH |
1423 | cutthrough_puts(US"DATA\r\n", 6); |
1424 | cutthrough_flush_send(); | |
e4bdf652 JH |
1425 | |
1426 | /* Assume nothing buffered. If it was it gets ignored. */ | |
1427 | return cutthrough_response('3', NULL) == '3'; | |
1428 | } | |
1429 | ||
1430 | ||
511a6c14 JH |
1431 | /* fd and use_crlf args only to match write_chunk() */ |
1432 | static BOOL | |
1433 | cutthrough_write_chunk(int fd, uschar * s, int len, BOOL use_crlf) | |
1434 | { | |
1435 | uschar * s2; | |
1436 | while(s && (s2 = Ustrchr(s, '\n'))) | |
1437 | { | |
1438 | if(!cutthrough_puts(s, s2-s) || !cutthrough_put_nl()) | |
1439 | return FALSE; | |
1440 | s = s2+1; | |
1441 | } | |
1442 | return TRUE; | |
1443 | } | |
1444 | ||
1445 | ||
e4bdf652 | 1446 | /* Buffered send of headers. Return success boolean. */ |
817d9f57 | 1447 | /* Expands newlines to wire format (CR,NL). */ |
e4bdf652 | 1448 | /* Also sends header-terminating blank line. */ |
e4bdf652 | 1449 | BOOL |
5032d1cf | 1450 | cutthrough_headers_send(void) |
e4bdf652 | 1451 | { |
5032d1cf | 1452 | if(cutthrough.fd < 0) |
e4bdf652 JH |
1453 | return FALSE; |
1454 | ||
511a6c14 JH |
1455 | /* We share a routine with the mainline transport to handle header add/remove/rewrites, |
1456 | but having a separate buffered-output function (for now) | |
1457 | */ | |
1458 | HDEBUG(D_acl) debug_printf("----------- start cutthrough headers send -----------\n"); | |
e4bdf652 | 1459 | |
5032d1cf JH |
1460 | if (!transport_headers_send(&cutthrough.addr, cutthrough.fd, |
1461 | cutthrough.addr.transport->add_headers, | |
1462 | cutthrough.addr.transport->remove_headers, | |
511a6c14 | 1463 | &cutthrough_write_chunk, TRUE, |
5032d1cf JH |
1464 | cutthrough.addr.transport->rewrite_rules, |
1465 | cutthrough.addr.transport->rewrite_existflags)) | |
511a6c14 JH |
1466 | return FALSE; |
1467 | ||
1468 | HDEBUG(D_acl) debug_printf("----------- done cutthrough headers send ------------\n"); | |
1469 | return TRUE; | |
817d9f57 JH |
1470 | } |
1471 | ||
1472 | ||
1473 | static void | |
5032d1cf | 1474 | close_cutthrough_connection(const char * why) |
817d9f57 | 1475 | { |
5032d1cf | 1476 | if(cutthrough.fd >= 0) |
817d9f57 JH |
1477 | { |
1478 | /* We could be sending this after a bunch of data, but that is ok as | |
1479 | the only way to cancel the transfer in dataphase is to drop the tcp | |
1480 | conn before the final dot. | |
1481 | */ | |
1482 | ctblock.ptr = ctbuffer; | |
1483 | HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> QUIT\n"); | |
1484 | _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */ | |
1485 | _cutthrough_flush_send(); | |
1486 | /* No wait for response */ | |
1487 | ||
1488 | #ifdef SUPPORT_TLS | |
1489 | tls_close(FALSE, TRUE); | |
1490 | #endif | |
5032d1cf JH |
1491 | (void)close(cutthrough.fd); |
1492 | cutthrough.fd = -1; | |
2e5b33cd | 1493 | HDEBUG(D_acl) debug_printf("----------- cutthrough shutdown (%s) ------------\n", why); |
817d9f57 JH |
1494 | } |
1495 | ctblock.ptr = ctbuffer; | |
e4bdf652 JH |
1496 | } |
1497 | ||
817d9f57 | 1498 | void |
5032d1cf | 1499 | cancel_cutthrough_connection(const char * why) |
817d9f57 | 1500 | { |
2e5b33cd | 1501 | close_cutthrough_connection(why); |
5032d1cf | 1502 | cutthrough.delivery = FALSE; |
817d9f57 JH |
1503 | } |
1504 | ||
1505 | ||
1506 | ||
e4bdf652 JH |
1507 | |
1508 | /* Have senders final-dot. Send one to cutthrough target, and grab the response. | |
1509 | Log an OK response as a transmission. | |
817d9f57 | 1510 | Close the connection. |
e4bdf652 | 1511 | Return smtp response-class digit. |
e4bdf652 JH |
1512 | */ |
1513 | uschar * | |
5032d1cf | 1514 | cutthrough_finaldot(void) |
e4bdf652 | 1515 | { |
5032d1cf JH |
1516 | uschar res; |
1517 | address_item * addr; | |
e4bdf652 JH |
1518 | HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> .\n"); |
1519 | ||
1520 | /* Assume data finshed with new-line */ | |
5032d1cf JH |
1521 | if( !cutthrough_puts(US".", 1) |
1522 | || !cutthrough_put_nl() | |
1523 | || !cutthrough_flush_send() | |
1524 | ) | |
1525 | return cutthrough.addr.message; | |
e4bdf652 | 1526 | |
5032d1cf JH |
1527 | res = cutthrough_response('2', &cutthrough.addr.message); |
1528 | for (addr = &cutthrough.addr; addr; addr = addr->next) | |
817d9f57 | 1529 | { |
5032d1cf JH |
1530 | addr->message = cutthrough.addr.message; |
1531 | switch(res) | |
1532 | { | |
1533 | case '2': | |
1534 | delivery_log(LOG_MAIN, addr, (int)'>', NULL); | |
1535 | close_cutthrough_connection("delivered"); | |
1536 | break; | |
817d9f57 | 1537 | |
5032d1cf JH |
1538 | case '4': |
1539 | delivery_log(LOG_MAIN, addr, 0, | |
1540 | US"tmp-reject from cutthrough after DATA:"); | |
1541 | break; | |
e4bdf652 | 1542 | |
5032d1cf JH |
1543 | case '5': |
1544 | delivery_log(LOG_MAIN|LOG_REJECT, addr, 0, | |
1545 | US"rejected after DATA:"); | |
1546 | break; | |
e4bdf652 | 1547 | |
5032d1cf JH |
1548 | default: |
1549 | break; | |
1550 | } | |
817d9f57 | 1551 | } |
5032d1cf | 1552 | return cutthrough.addr.message; |
e4bdf652 JH |
1553 | } |
1554 | ||
1555 | ||
817d9f57 | 1556 | |
059ec3d9 PH |
1557 | /************************************************* |
1558 | * Copy error to toplevel address * | |
1559 | *************************************************/ | |
1560 | ||
1561 | /* This function is used when a verify fails or defers, to ensure that the | |
1562 | failure or defer information is in the original toplevel address. This applies | |
1563 | when an address is redirected to a single new address, and the failure or | |
1564 | deferral happens to the child address. | |
1565 | ||
1566 | Arguments: | |
1567 | vaddr the verify address item | |
1568 | addr the final address item | |
1569 | yield FAIL or DEFER | |
1570 | ||
1571 | Returns: the value of YIELD | |
1572 | */ | |
1573 | ||
1574 | static int | |
1575 | copy_error(address_item *vaddr, address_item *addr, int yield) | |
1576 | { | |
1577 | if (addr != vaddr) | |
1578 | { | |
1579 | vaddr->message = addr->message; | |
1580 | vaddr->user_message = addr->user_message; | |
1581 | vaddr->basic_errno = addr->basic_errno; | |
1582 | vaddr->more_errno = addr->more_errno; | |
b37c4101 | 1583 | vaddr->p.address_data = addr->p.address_data; |
42855d71 | 1584 | copyflag(vaddr, addr, af_pass_message); |
059ec3d9 PH |
1585 | } |
1586 | return yield; | |
1587 | } | |
1588 | ||
1589 | ||
1590 | ||
1591 | ||
ce552449 NM |
1592 | /************************************************** |
1593 | * printf that automatically handles TLS if needed * | |
1594 | ***************************************************/ | |
1595 | ||
1596 | /* This function is used by verify_address() as a substitute for all fprintf() | |
1597 | calls; a direct fprintf() will not produce output in a TLS SMTP session, such | |
1598 | as a response to an EXPN command. smtp_in.c makes smtp_printf available but | |
1599 | that assumes that we always use the smtp_out FILE* when not using TLS or the | |
1600 | ssl buffer when we are. Instead we take a FILE* parameter and check to see if | |
1601 | that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular | |
1602 | fprintf(). | |
1603 | ||
1604 | Arguments: | |
1605 | f the candidate FILE* to write to | |
1606 | format format string | |
1607 | ... optional arguments | |
1608 | ||
1609 | Returns: | |
1610 | nothing | |
1611 | */ | |
1612 | ||
1613 | static void PRINTF_FUNCTION(2,3) | |
1ba28e2b | 1614 | respond_printf(FILE *f, const char *format, ...) |
ce552449 NM |
1615 | { |
1616 | va_list ap; | |
1617 | ||
1618 | va_start(ap, format); | |
1619 | if (smtp_out && (f == smtp_out)) | |
1620 | smtp_vprintf(format, ap); | |
1621 | else | |
513afc6a | 1622 | vfprintf(f, format, ap); |
ce552449 NM |
1623 | va_end(ap); |
1624 | } | |
1625 | ||
1626 | ||
1627 | ||
059ec3d9 PH |
1628 | /************************************************* |
1629 | * Verify an email address * | |
1630 | *************************************************/ | |
1631 | ||
1632 | /* This function is used both for verification (-bv and at other times) and | |
1633 | address testing (-bt), which is indicated by address_test_mode being set. | |
1634 | ||
1635 | Arguments: | |
1636 | vaddr contains the address to verify; the next field in this block | |
1637 | must be NULL | |
1638 | f if not NULL, write the result to this file | |
1639 | options various option bits: | |
1640 | vopt_fake_sender => this sender verify is not for the real | |
1641 | sender (it was verify=sender=xxxx or an address from a | |
1642 | header line) - rewriting must not change sender_address | |
1643 | vopt_is_recipient => this is a recipient address, otherwise | |
1644 | it's a sender address - this affects qualification and | |
1645 | rewriting and messages from callouts | |
1646 | vopt_qualify => qualify an unqualified address; else error | |
1647 | vopt_expn => called from SMTP EXPN command | |
eafd343b TK |
1648 | vopt_success_on_redirect => when a new address is generated |
1649 | the verification instantly succeeds | |
059ec3d9 PH |
1650 | |
1651 | These ones are used by do_callout() -- the options variable | |
1652 | is passed to it. | |
1653 | ||
2a4be8f9 | 1654 | vopt_callout_fullpm => if postmaster check, do full one |
059ec3d9 PH |
1655 | vopt_callout_no_cache => don't use callout cache |
1656 | vopt_callout_random => do the "random" thing | |
1657 | vopt_callout_recipsender => use real sender for recipient | |
1658 | vopt_callout_recippmaster => use postmaster for recipient | |
1659 | ||
1660 | callout if > 0, specifies that callout is required, and gives timeout | |
4deaf07d | 1661 | for individual commands |
059ec3d9 PH |
1662 | callout_overall if > 0, gives overall timeout for the callout function; |
1663 | if < 0, a default is used (see do_callout()) | |
8e669ac1 | 1664 | callout_connect the connection timeout for callouts |
059ec3d9 PH |
1665 | se_mailfrom when callout is requested to verify a sender, use this |
1666 | in MAIL FROM; NULL => "" | |
1667 | pm_mailfrom when callout is requested, if non-NULL, do the postmaster | |
1668 | thing and use this as the sender address (may be "") | |
1669 | ||
1670 | routed if not NULL, set TRUE if routing succeeded, so we can | |
1671 | distinguish between routing failed and callout failed | |
1672 | ||
1673 | Returns: OK address verified | |
1674 | FAIL address failed to verify | |
1675 | DEFER can't tell at present | |
1676 | */ | |
1677 | ||
1678 | int | |
1679 | verify_address(address_item *vaddr, FILE *f, int options, int callout, | |
8e669ac1 | 1680 | int callout_overall, int callout_connect, uschar *se_mailfrom, |
4deaf07d | 1681 | uschar *pm_mailfrom, BOOL *routed) |
059ec3d9 PH |
1682 | { |
1683 | BOOL allok = TRUE; | |
1684 | BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0); | |
1685 | BOOL is_recipient = (options & vopt_is_recipient) != 0; | |
1686 | BOOL expn = (options & vopt_expn) != 0; | |
eafd343b | 1687 | BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0; |
059ec3d9 PH |
1688 | int i; |
1689 | int yield = OK; | |
1690 | int verify_type = expn? v_expn : | |
1691 | address_test_mode? v_none : | |
1692 | is_recipient? v_recipient : v_sender; | |
1693 | address_item *addr_list; | |
1694 | address_item *addr_new = NULL; | |
1695 | address_item *addr_remote = NULL; | |
1696 | address_item *addr_local = NULL; | |
1697 | address_item *addr_succeed = NULL; | |
8e669ac1 | 1698 | uschar **failure_ptr = is_recipient? |
2c7db3f5 | 1699 | &recipient_verify_failure : &sender_verify_failure; |
059ec3d9 PH |
1700 | uschar *ko_prefix, *cr; |
1701 | uschar *address = vaddr->address; | |
1702 | uschar *save_sender; | |
1703 | uschar null_sender[] = { 0 }; /* Ensure writeable memory */ | |
1704 | ||
2c7db3f5 PH |
1705 | /* Clear, just in case */ |
1706 | ||
1707 | *failure_ptr = NULL; | |
1708 | ||
059ec3d9 PH |
1709 | /* Set up a prefix and suffix for error message which allow us to use the same |
1710 | output statements both in EXPN mode (where an SMTP response is needed) and when | |
1711 | debugging with an output file. */ | |
1712 | ||
1713 | if (expn) | |
1714 | { | |
1715 | ko_prefix = US"553 "; | |
1716 | cr = US"\r"; | |
1717 | } | |
1718 | else ko_prefix = cr = US""; | |
1719 | ||
1720 | /* Add qualify domain if permitted; otherwise an unqualified address fails. */ | |
1721 | ||
1722 | if (parse_find_at(address) == NULL) | |
1723 | { | |
1724 | if ((options & vopt_qualify) == 0) | |
1725 | { | |
1726 | if (f != NULL) | |
ce552449 NM |
1727 | respond_printf(f, "%sA domain is required for \"%s\"%s\n", |
1728 | ko_prefix, address, cr); | |
8e669ac1 | 1729 | *failure_ptr = US"qualify"; |
059ec3d9 PH |
1730 | return FAIL; |
1731 | } | |
1732 | address = rewrite_address_qualify(address, is_recipient); | |
1733 | } | |
1734 | ||
1735 | DEBUG(D_verify) | |
1736 | { | |
1737 | debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1738 | debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address); | |
1739 | } | |
1740 | ||
1741 | /* Rewrite and report on it. Clear the domain and local part caches - these | |
1742 | may have been set by domains and local part tests during an ACL. */ | |
1743 | ||
1744 | if (global_rewrite_rules != NULL) | |
1745 | { | |
1746 | uschar *old = address; | |
1747 | address = rewrite_address(address, is_recipient, FALSE, | |
1748 | global_rewrite_rules, rewrite_existflags); | |
1749 | if (address != old) | |
1750 | { | |
1751 | for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0; | |
1752 | for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0; | |
1753 | if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address); | |
1754 | } | |
1755 | } | |
1756 | ||
1757 | /* If this is the real sender address, we must update sender_address at | |
1758 | this point, because it may be referred to in the routers. */ | |
1759 | ||
1760 | if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0) | |
1761 | sender_address = address; | |
1762 | ||
1763 | /* If the address was rewritten to <> no verification can be done, and we have | |
1764 | to return OK. This rewriting is permitted only for sender addresses; for other | |
1765 | addresses, such rewriting fails. */ | |
1766 | ||
1767 | if (address[0] == 0) return OK; | |
1768 | ||
d9b2312b JH |
1769 | /* Flip the legacy TLS-related variables over to the outbound set in case |
1770 | they're used in the context of a transport used by verification. Reset them | |
1771 | at exit from this routine. */ | |
1772 | ||
35aba663 | 1773 | tls_modify_variables(&tls_out); |
d9b2312b | 1774 | |
059ec3d9 PH |
1775 | /* Save a copy of the sender address for re-instating if we change it to <> |
1776 | while verifying a sender address (a nice bit of self-reference there). */ | |
1777 | ||
1778 | save_sender = sender_address; | |
1779 | ||
1780 | /* Update the address structure with the possibly qualified and rewritten | |
1781 | address. Set it up as the starting address on the chain of new addresses. */ | |
1782 | ||
1783 | vaddr->address = address; | |
1784 | addr_new = vaddr; | |
1785 | ||
1786 | /* We need a loop, because an address can generate new addresses. We must also | |
1787 | cope with generated pipes and files at the top level. (See also the code and | |
1788 | comment in deliver.c.) However, it is usually the case that the router for | |
1789 | user's .forward files has its verify flag turned off. | |
1790 | ||
1791 | If an address generates more than one child, the loop is used only when | |
1792 | full_info is set, and this can only be set locally. Remote enquiries just get | |
1793 | information about the top level address, not anything that it generated. */ | |
1794 | ||
1795 | while (addr_new != NULL) | |
1796 | { | |
1797 | int rc; | |
1798 | address_item *addr = addr_new; | |
1799 | ||
1800 | addr_new = addr->next; | |
1801 | addr->next = NULL; | |
1802 | ||
1803 | DEBUG(D_verify) | |
1804 | { | |
1805 | debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1806 | debug_printf("Considering %s\n", addr->address); | |
1807 | } | |
1808 | ||
1809 | /* Handle generated pipe, file or reply addresses. We don't get these | |
1810 | when handling EXPN, as it does only one level of expansion. */ | |
1811 | ||
1812 | if (testflag(addr, af_pfr)) | |
1813 | { | |
1814 | allok = FALSE; | |
1815 | if (f != NULL) | |
1816 | { | |
1817 | BOOL allow; | |
1818 | ||
1819 | if (addr->address[0] == '>') | |
1820 | { | |
1821 | allow = testflag(addr, af_allow_reply); | |
1822 | fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1); | |
1823 | } | |
1824 | else | |
1825 | { | |
1826 | allow = (addr->address[0] == '|')? | |
1827 | testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file); | |
1828 | fprintf(f, "%s -> %s", addr->parent->address, addr->address); | |
1829 | } | |
1830 | ||
1831 | if (addr->basic_errno == ERRNO_BADTRANSPORT) | |
1832 | fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n" | |
1833 | "%s\n", addr->message); | |
1834 | else if (allow) | |
1835 | fprintf(f, "\n transport = %s\n", addr->transport->name); | |
1836 | else | |
1837 | fprintf(f, " *** forbidden ***\n"); | |
1838 | } | |
1839 | continue; | |
1840 | } | |
1841 | ||
1842 | /* Just in case some router parameter refers to it. */ | |
1843 | ||
1844 | return_path = (addr->p.errors_address != NULL)? | |
1845 | addr->p.errors_address : sender_address; | |
1846 | ||
1847 | /* Split the address into domain and local part, handling the %-hack if | |
1848 | necessary, and then route it. While routing a sender address, set | |
1849 | $sender_address to <> because that is what it will be if we were trying to | |
1850 | send a bounce to the sender. */ | |
1851 | ||
1852 | if (routed != NULL) *routed = FALSE; | |
1853 | if ((rc = deliver_split_address(addr)) == OK) | |
1854 | { | |
1855 | if (!is_recipient) sender_address = null_sender; | |
1856 | rc = route_address(addr, &addr_local, &addr_remote, &addr_new, | |
1857 | &addr_succeed, verify_type); | |
1858 | sender_address = save_sender; /* Put back the real sender */ | |
1859 | } | |
1860 | ||
1861 | /* If routing an address succeeded, set the flag that remembers, for use when | |
1862 | an ACL cached a sender verify (in case a callout fails). Then if routing set | |
1863 | up a list of hosts or the transport has a host list, and the callout option | |
1864 | is set, and we aren't in a host checking run, do the callout verification, | |
1865 | and set another flag that notes that a callout happened. */ | |
1866 | ||
1867 | if (rc == OK) | |
1868 | { | |
1869 | if (routed != NULL) *routed = TRUE; | |
1870 | if (callout > 0) | |
1871 | { | |
1872 | host_item *host_list = addr->host_list; | |
1873 | ||
26da7e20 PH |
1874 | /* Make up some data for use in the case where there is no remote |
1875 | transport. */ | |
1876 | ||
1877 | transport_feedback tf = { | |
1878 | NULL, /* interface (=> any) */ | |
1879 | US"smtp", /* port */ | |
1880 | US"smtp", /* protocol */ | |
1881 | NULL, /* hosts */ | |
1882 | US"$smtp_active_hostname", /* helo_data */ | |
1883 | FALSE, /* hosts_override */ | |
1884 | FALSE, /* hosts_randomize */ | |
1885 | FALSE, /* gethostbyname */ | |
1886 | TRUE, /* qualify_single */ | |
1887 | FALSE /* search_parents */ | |
1888 | }; | |
059ec3d9 PH |
1889 | |
1890 | /* If verification yielded a remote transport, we want to use that | |
1891 | transport's options, so as to mimic what would happen if we were really | |
1892 | sending a message to this address. */ | |
1893 | ||
1894 | if (addr->transport != NULL && !addr->transport->info->local) | |
1895 | { | |
929ba01c | 1896 | (void)(addr->transport->setup)(addr->transport, addr, &tf, 0, 0, NULL); |
059ec3d9 PH |
1897 | |
1898 | /* If the transport has hosts and the router does not, or if the | |
1899 | transport is configured to override the router's hosts, we must build a | |
1900 | host list of the transport's hosts, and find the IP addresses */ | |
1901 | ||
1902 | if (tf.hosts != NULL && (host_list == NULL || tf.hosts_override)) | |
1903 | { | |
1904 | uschar *s; | |
750af86e PH |
1905 | uschar *save_deliver_domain = deliver_domain; |
1906 | uschar *save_deliver_localpart = deliver_localpart; | |
059ec3d9 PH |
1907 | |
1908 | host_list = NULL; /* Ignore the router's hosts */ | |
1909 | ||
1910 | deliver_domain = addr->domain; | |
1911 | deliver_localpart = addr->local_part; | |
1912 | s = expand_string(tf.hosts); | |
750af86e PH |
1913 | deliver_domain = save_deliver_domain; |
1914 | deliver_localpart = save_deliver_localpart; | |
059ec3d9 PH |
1915 | |
1916 | if (s == NULL) | |
1917 | { | |
1918 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts " | |
1919 | "\"%s\" in %s transport for callout: %s", tf.hosts, | |
1920 | addr->transport->name, expand_string_message); | |
1921 | } | |
1922 | else | |
1923 | { | |
322050c2 | 1924 | int flags; |
059ec3d9 | 1925 | uschar *canonical_name; |
d8ef3577 | 1926 | host_item *host, *nexthost; |
059ec3d9 PH |
1927 | host_build_hostlist(&host_list, s, tf.hosts_randomize); |
1928 | ||
1929 | /* Just ignore failures to find a host address. If we don't manage | |
8e669ac1 PH |
1930 | to find any addresses, the callout will defer. Note that more than |
1931 | one address may be found for a single host, which will result in | |
1932 | additional host items being inserted into the chain. Hence we must | |
d8ef3577 | 1933 | save the next host first. */ |
059ec3d9 | 1934 | |
322050c2 PH |
1935 | flags = HOST_FIND_BY_A; |
1936 | if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; | |
1937 | if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS; | |
1938 | ||
d8ef3577 | 1939 | for (host = host_list; host != NULL; host = nexthost) |
059ec3d9 | 1940 | { |
d8ef3577 | 1941 | nexthost = host->next; |
8e669ac1 | 1942 | if (tf.gethostbyname || |
7e66e54d | 1943 | string_is_ip_address(host->name, NULL) != 0) |
322050c2 | 1944 | (void)host_find_byname(host, NULL, flags, &canonical_name, TRUE); |
059ec3d9 | 1945 | else |
9d9c3746 JH |
1946 | { |
1947 | uschar * d_request = NULL, * d_require = NULL; | |
1948 | if (Ustrcmp(addr->transport->driver_name, "smtp") == 0) | |
1949 | { | |
1950 | smtp_transport_options_block * ob = | |
1951 | (smtp_transport_options_block *) | |
1952 | addr->transport->options_block; | |
1953 | d_request = ob->dnssec_request_domains; | |
1954 | d_require = ob->dnssec_require_domains; | |
1955 | } | |
1956 | ||
059ec3d9 | 1957 | (void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
9d9c3746 JH |
1958 | d_request, d_require, &canonical_name, NULL); |
1959 | } | |
059ec3d9 PH |
1960 | } |
1961 | } | |
1962 | } | |
1963 | } | |
1964 | ||
8e669ac1 | 1965 | /* Can only do a callout if we have at least one host! If the callout |
2c7db3f5 | 1966 | fails, it will have set ${sender,recipient}_verify_failure. */ |
059ec3d9 PH |
1967 | |
1968 | if (host_list != NULL) | |
1969 | { | |
1970 | HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n"); | |
1971 | if (host_checking && !host_checking_callout) | |
1972 | { | |
1973 | HDEBUG(D_verify) | |
1974 | debug_printf("... callout omitted by default when host testing\n" | |
1975 | "(Use -bhc if you want the callouts to happen.)\n"); | |
1976 | } | |
1977 | else | |
1978 | { | |
4ed8d31a JH |
1979 | #ifdef SUPPORT_TLS |
1980 | deliver_set_expansions(addr); | |
1981 | #endif | |
aec45841 | 1982 | verify_mode = is_recipient ? US"R" : US"S"; |
059ec3d9 | 1983 | rc = do_callout(addr, host_list, &tf, callout, callout_overall, |
4deaf07d | 1984 | callout_connect, options, se_mailfrom, pm_mailfrom); |
aec45841 | 1985 | verify_mode = NULL; |
059ec3d9 PH |
1986 | } |
1987 | } | |
1988 | else | |
1989 | { | |
1990 | HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor " | |
1991 | "transport provided a host list\n"); | |
1992 | } | |
1993 | } | |
1994 | } | |
8e669ac1 | 1995 | |
2c7db3f5 | 1996 | /* Otherwise, any failure is a routing failure */ |
8e669ac1 PH |
1997 | |
1998 | else *failure_ptr = US"route"; | |
059ec3d9 PH |
1999 | |
2000 | /* A router may return REROUTED if it has set up a child address as a result | |
2001 | of a change of domain name (typically from widening). In this case we always | |
2002 | want to continue to verify the new child. */ | |
2003 | ||
2004 | if (rc == REROUTED) continue; | |
8e669ac1 | 2005 | |
059ec3d9 PH |
2006 | /* Handle hard failures */ |
2007 | ||
2008 | if (rc == FAIL) | |
2009 | { | |
2010 | allok = FALSE; | |
2011 | if (f != NULL) | |
2012 | { | |
e6f6568e PH |
2013 | address_item *p = addr->parent; |
2014 | ||
ce552449 NM |
2015 | respond_printf(f, "%s%s %s", ko_prefix, |
2016 | full_info? addr->address : address, | |
059ec3d9 PH |
2017 | address_test_mode? "is undeliverable" : "failed to verify"); |
2018 | if (!expn && admin_user) | |
2019 | { | |
2020 | if (addr->basic_errno > 0) | |
ce552449 | 2021 | respond_printf(f, ": %s", strerror(addr->basic_errno)); |
059ec3d9 | 2022 | if (addr->message != NULL) |
ce552449 | 2023 | respond_printf(f, ": %s", addr->message); |
e6f6568e PH |
2024 | } |
2025 | ||
2026 | /* Show parents iff doing full info */ | |
2027 | ||
2028 | if (full_info) while (p != NULL) | |
2029 | { | |
ce552449 | 2030 | respond_printf(f, "%s\n <-- %s", cr, p->address); |
e6f6568e | 2031 | p = p->parent; |
059ec3d9 | 2032 | } |
ce552449 | 2033 | respond_printf(f, "%s\n", cr); |
059ec3d9 | 2034 | } |
2e5b33cd | 2035 | cancel_cutthrough_connection("routing hard fail"); |
059ec3d9 | 2036 | |
d9b2312b JH |
2037 | if (!full_info) |
2038 | { | |
2039 | yield = copy_error(vaddr, addr, FAIL); | |
2040 | goto out; | |
2041 | } | |
2042 | else yield = FAIL; | |
059ec3d9 PH |
2043 | } |
2044 | ||
2045 | /* Soft failure */ | |
2046 | ||
2047 | else if (rc == DEFER) | |
2048 | { | |
2049 | allok = FALSE; | |
2050 | if (f != NULL) | |
2051 | { | |
e6f6568e | 2052 | address_item *p = addr->parent; |
ce552449 | 2053 | respond_printf(f, "%s%s cannot be resolved at this time", ko_prefix, |
322050c2 | 2054 | full_info? addr->address : address); |
059ec3d9 PH |
2055 | if (!expn && admin_user) |
2056 | { | |
2057 | if (addr->basic_errno > 0) | |
ce552449 | 2058 | respond_printf(f, ": %s", strerror(addr->basic_errno)); |
059ec3d9 | 2059 | if (addr->message != NULL) |
ce552449 | 2060 | respond_printf(f, ": %s", addr->message); |
059ec3d9 | 2061 | else if (addr->basic_errno <= 0) |
ce552449 | 2062 | respond_printf(f, ": unknown error"); |
059ec3d9 PH |
2063 | } |
2064 | ||
e6f6568e PH |
2065 | /* Show parents iff doing full info */ |
2066 | ||
2067 | if (full_info) while (p != NULL) | |
2068 | { | |
ce552449 | 2069 | respond_printf(f, "%s\n <-- %s", cr, p->address); |
e6f6568e PH |
2070 | p = p->parent; |
2071 | } | |
ce552449 | 2072 | respond_printf(f, "%s\n", cr); |
059ec3d9 | 2073 | } |
2e5b33cd | 2074 | cancel_cutthrough_connection("routing soft fail"); |
e4bdf652 | 2075 | |
d9b2312b JH |
2076 | if (!full_info) |
2077 | { | |
2078 | yield = copy_error(vaddr, addr, DEFER); | |
2079 | goto out; | |
2080 | } | |
2081 | else if (yield == OK) yield = DEFER; | |
059ec3d9 PH |
2082 | } |
2083 | ||
2084 | /* If we are handling EXPN, we do not want to continue to route beyond | |
e6f6568e | 2085 | the top level (whose address is in "address"). */ |
059ec3d9 PH |
2086 | |
2087 | else if (expn) | |
2088 | { | |
2089 | uschar *ok_prefix = US"250-"; | |
2090 | if (addr_new == NULL) | |
2091 | { | |
2092 | if (addr_local == NULL && addr_remote == NULL) | |
ce552449 | 2093 | respond_printf(f, "250 mail to <%s> is discarded\r\n", address); |
059ec3d9 | 2094 | else |
ce552449 | 2095 | respond_printf(f, "250 <%s>\r\n", address); |
059ec3d9 PH |
2096 | } |
2097 | else while (addr_new != NULL) | |
2098 | { | |
2099 | address_item *addr2 = addr_new; | |
2100 | addr_new = addr2->next; | |
2101 | if (addr_new == NULL) ok_prefix = US"250 "; | |
ce552449 | 2102 | respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address); |
059ec3d9 | 2103 | } |
d9b2312b JH |
2104 | yield = OK; |
2105 | goto out; | |
059ec3d9 PH |
2106 | } |
2107 | ||
2108 | /* Successful routing other than EXPN. */ | |
2109 | ||
2110 | else | |
2111 | { | |
2112 | /* Handle successful routing when short info wanted. Otherwise continue for | |
2113 | other (generated) addresses. Short info is the operational case. Full info | |
2114 | can be requested only when debug_selector != 0 and a file is supplied. | |
2115 | ||
2116 | There is a conflict between the use of aliasing as an alternate email | |
2117 | address, and as a sort of mailing list. If an alias turns the incoming | |
2118 | address into just one address (e.g. J.Caesar->jc44) you may well want to | |
2119 | carry on verifying the generated address to ensure it is valid when | |
2120 | checking incoming mail. If aliasing generates multiple addresses, you | |
2121 | probably don't want to do this. Exim therefore treats the generation of | |
2122 | just a single new address as a special case, and continues on to verify the | |
2123 | generated address. */ | |
2124 | ||
2125 | if (!full_info && /* Stop if short info wanted AND */ | |
eafd343b TK |
2126 | (((addr_new == NULL || /* No new address OR */ |
2127 | addr_new->next != NULL || /* More than one new address OR */ | |
2128 | testflag(addr_new, af_pfr))) /* New address is pfr */ | |
2129 | || /* OR */ | |
2130 | (addr_new != NULL && /* At least one new address AND */ | |
2131 | success_on_redirect))) /* success_on_redirect is set */ | |
059ec3d9 | 2132 | { |
322050c2 | 2133 | if (f != NULL) fprintf(f, "%s %s\n", address, |
059ec3d9 PH |
2134 | address_test_mode? "is deliverable" : "verified"); |
2135 | ||
2136 | /* If we have carried on to verify a child address, we want the value | |
2137 | of $address_data to be that of the child */ | |
2138 | ||
2139 | vaddr->p.address_data = addr->p.address_data; | |
d9b2312b JH |
2140 | yield = OK; |
2141 | goto out; | |
059ec3d9 PH |
2142 | } |
2143 | } | |
2144 | } /* Loop for generated addresses */ | |
2145 | ||
2146 | /* Display the full results of the successful routing, including any generated | |
2147 | addresses. Control gets here only when full_info is set, which requires f not | |
2148 | to be NULL, and this occurs only when a top-level verify is called with the | |
2149 | debugging switch on. | |
2150 | ||
2151 | If there are no local and no remote addresses, and there were no pipes, files, | |
2152 | or autoreplies, and there were no errors or deferments, the message is to be | |
2153 | discarded, usually because of the use of :blackhole: in an alias file. */ | |
2154 | ||
2155 | if (allok && addr_local == NULL && addr_remote == NULL) | |
dbcef0ea | 2156 | { |
059ec3d9 | 2157 | fprintf(f, "mail to %s is discarded\n", address); |
d9b2312b | 2158 | goto out; |
dbcef0ea | 2159 | } |
059ec3d9 | 2160 | |
dbcef0ea | 2161 | for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++) |
059ec3d9 PH |
2162 | { |
2163 | while (addr_list != NULL) | |
2164 | { | |
2165 | address_item *addr = addr_list; | |
2166 | address_item *p = addr->parent; | |
2167 | addr_list = addr->next; | |
2168 | ||
2169 | fprintf(f, "%s", CS addr->address); | |
384152a6 TK |
2170 | #ifdef EXPERIMENTAL_SRS |
2171 | if(addr->p.srs_sender) | |
2172 | fprintf(f, " [srs = %s]", addr->p.srs_sender); | |
2173 | #endif | |
dbcef0ea PH |
2174 | |
2175 | /* If the address is a duplicate, show something about it. */ | |
2176 | ||
2177 | if (!testflag(addr, af_pfr)) | |
2178 | { | |
2179 | tree_node *tnode; | |
2180 | if ((tnode = tree_search(tree_duplicates, addr->unique)) != NULL) | |
2181 | fprintf(f, " [duplicate, would not be delivered]"); | |
2182 | else tree_add_duplicate(addr->unique, addr); | |
2183 | } | |
2184 | ||
2185 | /* Now show its parents */ | |
2186 | ||
059ec3d9 PH |
2187 | while (p != NULL) |
2188 | { | |
2189 | fprintf(f, "\n <-- %s", p->address); | |
2190 | p = p->parent; | |
2191 | } | |
2192 | fprintf(f, "\n "); | |
2193 | ||
2194 | /* Show router, and transport */ | |
2195 | ||
2196 | fprintf(f, "router = %s, ", addr->router->name); | |
2197 | fprintf(f, "transport = %s\n", (addr->transport == NULL)? US"unset" : | |
2198 | addr->transport->name); | |
2199 | ||
2200 | /* Show any hosts that are set up by a router unless the transport | |
2201 | is going to override them; fiddle a bit to get a nice format. */ | |
2202 | ||
2203 | if (addr->host_list != NULL && addr->transport != NULL && | |
2204 | !addr->transport->overrides_hosts) | |
2205 | { | |
2206 | host_item *h; | |
2207 | int maxlen = 0; | |
2208 | int maxaddlen = 0; | |
2209 | for (h = addr->host_list; h != NULL; h = h->next) | |
2210 | { | |
2211 | int len = Ustrlen(h->name); | |
2212 | if (len > maxlen) maxlen = len; | |
2213 | len = (h->address != NULL)? Ustrlen(h->address) : 7; | |
2214 | if (len > maxaddlen) maxaddlen = len; | |
2215 | } | |
2216 | for (h = addr->host_list; h != NULL; h = h->next) | |
2217 | { | |
2218 | int len = Ustrlen(h->name); | |
2219 | fprintf(f, " host %s ", h->name); | |
2220 | while (len++ < maxlen) fprintf(f, " "); | |
2221 | if (h->address != NULL) | |
2222 | { | |
2223 | fprintf(f, "[%s] ", h->address); | |
2224 | len = Ustrlen(h->address); | |
2225 | } | |
2226 | else if (!addr->transport->info->local) /* Omit [unknown] for local */ | |
2227 | { | |
2228 | fprintf(f, "[unknown] "); | |
2229 | len = 7; | |
2230 | } | |
2231 | else len = -3; | |
2232 | while (len++ < maxaddlen) fprintf(f," "); | |
2233 | if (h->mx >= 0) fprintf(f, "MX=%d", h->mx); | |
2234 | if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port); | |
2235 | if (h->status == hstatus_unusable) fprintf(f, " ** unusable **"); | |
2236 | fprintf(f, "\n"); | |
2237 | } | |
2238 | } | |
2239 | } | |
2240 | } | |
2241 | ||
d9b2312b | 2242 | /* Yield will be DEFER or FAIL if any one address has, only for full_info (which is |
2c7db3f5 PH |
2243 | the -bv or -bt case). */ |
2244 | ||
d9b2312b | 2245 | out: |
35aba663 | 2246 | tls_modify_variables(&tls_in); |
d9b2312b | 2247 | |
8e669ac1 | 2248 | return yield; |
059ec3d9 PH |
2249 | } |
2250 | ||
2251 | ||
2252 | ||
2253 | ||
2254 | /************************************************* | |
2255 | * Check headers for syntax errors * | |
2256 | *************************************************/ | |
2257 | ||
2258 | /* This function checks those header lines that contain addresses, and verifies | |
2259 | that all the addresses therein are syntactially correct. | |
2260 | ||
2261 | Arguments: | |
2262 | msgptr where to put an error message | |
2263 | ||
2264 | Returns: OK | |
2265 | FAIL | |
2266 | */ | |
2267 | ||
2268 | int | |
2269 | verify_check_headers(uschar **msgptr) | |
2270 | { | |
2271 | header_line *h; | |
2272 | uschar *colon, *s; | |
1eccaa59 | 2273 | int yield = OK; |
059ec3d9 | 2274 | |
1eccaa59 | 2275 | for (h = header_list; h != NULL && yield == OK; h = h->next) |
059ec3d9 PH |
2276 | { |
2277 | if (h->type != htype_from && | |
2278 | h->type != htype_reply_to && | |
2279 | h->type != htype_sender && | |
2280 | h->type != htype_to && | |
2281 | h->type != htype_cc && | |
2282 | h->type != htype_bcc) | |
2283 | continue; | |
2284 | ||
2285 | colon = Ustrchr(h->text, ':'); | |
2286 | s = colon + 1; | |
2287 | while (isspace(*s)) s++; | |
2288 | ||
1eccaa59 PH |
2289 | /* Loop for multiple addresses in the header, enabling group syntax. Note |
2290 | that we have to reset this after the header has been scanned. */ | |
059ec3d9 | 2291 | |
1eccaa59 | 2292 | parse_allow_group = TRUE; |
059ec3d9 PH |
2293 | |
2294 | while (*s != 0) | |
2295 | { | |
2296 | uschar *ss = parse_find_address_end(s, FALSE); | |
2297 | uschar *recipient, *errmess; | |
2298 | int terminator = *ss; | |
2299 | int start, end, domain; | |
2300 | ||
2301 | /* Temporarily terminate the string at this point, and extract the | |
1eccaa59 | 2302 | operative address within, allowing group syntax. */ |
059ec3d9 PH |
2303 | |
2304 | *ss = 0; | |
2305 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
2306 | *ss = terminator; | |
2307 | ||
2308 | /* Permit an unqualified address only if the message is local, or if the | |
2309 | sending host is configured to be permitted to send them. */ | |
2310 | ||
2311 | if (recipient != NULL && domain == 0) | |
2312 | { | |
2313 | if (h->type == htype_from || h->type == htype_sender) | |
2314 | { | |
2315 | if (!allow_unqualified_sender) recipient = NULL; | |
2316 | } | |
2317 | else | |
2318 | { | |
2319 | if (!allow_unqualified_recipient) recipient = NULL; | |
2320 | } | |
2321 | if (recipient == NULL) errmess = US"unqualified address not permitted"; | |
2322 | } | |
2323 | ||
2324 | /* It's an error if no address could be extracted, except for the special | |
2325 | case of an empty address. */ | |
2326 | ||
2327 | if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0) | |
2328 | { | |
2329 | uschar *verb = US"is"; | |
2330 | uschar *t = ss; | |
1ab95fa6 | 2331 | uschar *tt = colon; |
059ec3d9 PH |
2332 | int len; |
2333 | ||
2334 | /* Arrange not to include any white space at the end in the | |
1ab95fa6 | 2335 | error message or the header name. */ |
059ec3d9 PH |
2336 | |
2337 | while (t > s && isspace(t[-1])) t--; | |
1ab95fa6 | 2338 | while (tt > h->text && isspace(tt[-1])) tt--; |
059ec3d9 | 2339 | |
1ab95fa6 | 2340 | /* Add the address that failed to the error message, since in a |
059ec3d9 PH |
2341 | header with very many addresses it is sometimes hard to spot |
2342 | which one is at fault. However, limit the amount of address to | |
2343 | quote - cases have been seen where, for example, a missing double | |
2344 | quote in a humungous To: header creates an "address" that is longer | |
2345 | than string_sprintf can handle. */ | |
2346 | ||
2347 | len = t - s; | |
2348 | if (len > 1024) | |
2349 | { | |
2350 | len = 1024; | |
2351 | verb = US"begins"; | |
2352 | } | |
2353 | ||
2354 | *msgptr = string_printing( | |
1ab95fa6 PH |
2355 | string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s", |
2356 | errmess, tt - h->text, h->text, verb, len, s)); | |
059ec3d9 | 2357 | |
1eccaa59 PH |
2358 | yield = FAIL; |
2359 | break; /* Out of address loop */ | |
059ec3d9 PH |
2360 | } |
2361 | ||
2362 | /* Advance to the next address */ | |
2363 | ||
2364 | s = ss + (terminator? 1:0); | |
2365 | while (isspace(*s)) s++; | |
2366 | } /* Next address */ | |
059ec3d9 | 2367 | |
1eccaa59 PH |
2368 | parse_allow_group = FALSE; |
2369 | parse_found_group = FALSE; | |
2370 | } /* Next header unless yield has been set FALSE */ | |
2371 | ||
2372 | return yield; | |
059ec3d9 PH |
2373 | } |
2374 | ||
2375 | ||
770747fd MFM |
2376 | /************************************************* |
2377 | * Check header names for 8-bit characters * | |
2378 | *************************************************/ | |
2379 | ||
2380 | /* This function checks for invalid charcters in header names. See | |
2381 | RFC 5322, 2.2. and RFC 6532, 3. | |
2382 | ||
2383 | Arguments: | |
2384 | msgptr where to put an error message | |
2385 | ||
2386 | Returns: OK | |
2387 | FAIL | |
2388 | */ | |
2389 | ||
2390 | int | |
2391 | verify_check_header_names_ascii(uschar **msgptr) | |
2392 | { | |
2393 | header_line *h; | |
2394 | uschar *colon, *s; | |
2395 | ||
2396 | for (h = header_list; h != NULL; h = h->next) | |
2397 | { | |
2398 | colon = Ustrchr(h->text, ':'); | |
2399 | for(s = h->text; s < colon; s++) | |
2400 | { | |
2401 | if ((*s < 33) || (*s > 126)) | |
2402 | { | |
2403 | *msgptr = string_sprintf("Invalid character in header \"%.*s\" found", | |
2404 | colon - h->text, h->text); | |
2405 | return FAIL; | |
2406 | } | |
2407 | } | |
2408 | } | |
2409 | return OK; | |
2410 | } | |
059ec3d9 | 2411 | |
1c41c9cc PH |
2412 | /************************************************* |
2413 | * Check for blind recipients * | |
2414 | *************************************************/ | |
2415 | ||
2416 | /* This function checks that every (envelope) recipient is mentioned in either | |
2417 | the To: or Cc: header lines, thus detecting blind carbon copies. | |
2418 | ||
2419 | There are two ways of scanning that could be used: either scan the header lines | |
2420 | and tick off the recipients, or scan the recipients and check the header lines. | |
2421 | The original proposed patch did the former, but I have chosen to do the latter, | |
2422 | because (a) it requires no memory and (b) will use fewer resources when there | |
2423 | are many addresses in To: and/or Cc: and only one or two envelope recipients. | |
2424 | ||
2425 | Arguments: none | |
2426 | Returns: OK if there are no blind recipients | |
2427 | FAIL if there is at least one blind recipient | |
2428 | */ | |
2429 | ||
2430 | int | |
2431 | verify_check_notblind(void) | |
2432 | { | |
2433 | int i; | |
2434 | for (i = 0; i < recipients_count; i++) | |
2435 | { | |
2436 | header_line *h; | |
2437 | BOOL found = FALSE; | |
2438 | uschar *address = recipients_list[i].address; | |
2439 | ||
2440 | for (h = header_list; !found && h != NULL; h = h->next) | |
2441 | { | |
2442 | uschar *colon, *s; | |
2443 | ||
2444 | if (h->type != htype_to && h->type != htype_cc) continue; | |
2445 | ||
2446 | colon = Ustrchr(h->text, ':'); | |
2447 | s = colon + 1; | |
2448 | while (isspace(*s)) s++; | |
2449 | ||
1eccaa59 PH |
2450 | /* Loop for multiple addresses in the header, enabling group syntax. Note |
2451 | that we have to reset this after the header has been scanned. */ | |
1c41c9cc | 2452 | |
1eccaa59 | 2453 | parse_allow_group = TRUE; |
1c41c9cc PH |
2454 | |
2455 | while (*s != 0) | |
2456 | { | |
2457 | uschar *ss = parse_find_address_end(s, FALSE); | |
2458 | uschar *recipient,*errmess; | |
2459 | int terminator = *ss; | |
2460 | int start, end, domain; | |
2461 | ||
2462 | /* Temporarily terminate the string at this point, and extract the | |
1eccaa59 | 2463 | operative address within, allowing group syntax. */ |
1c41c9cc PH |
2464 | |
2465 | *ss = 0; | |
2466 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
2467 | *ss = terminator; | |
2468 | ||
2469 | /* If we found a valid recipient that has a domain, compare it with the | |
2470 | envelope recipient. Local parts are compared case-sensitively, domains | |
2471 | case-insensitively. By comparing from the start with length "domain", we | |
2472 | include the "@" at the end, which ensures that we are comparing the whole | |
2473 | local part of each address. */ | |
2474 | ||
2475 | if (recipient != NULL && domain != 0) | |
2476 | { | |
2477 | found = Ustrncmp(recipient, address, domain) == 0 && | |
2478 | strcmpic(recipient + domain, address + domain) == 0; | |
2479 | if (found) break; | |
2480 | } | |
2481 | ||
2482 | /* Advance to the next address */ | |
2483 | ||
2484 | s = ss + (terminator? 1:0); | |
2485 | while (isspace(*s)) s++; | |
2486 | } /* Next address */ | |
1eccaa59 PH |
2487 | |
2488 | parse_allow_group = FALSE; | |
2489 | parse_found_group = FALSE; | |
1c41c9cc PH |
2490 | } /* Next header (if found is false) */ |
2491 | ||
2492 | if (!found) return FAIL; | |
2493 | } /* Next recipient */ | |
2494 | ||
2495 | return OK; | |
2496 | } | |
2497 | ||
2498 | ||
059ec3d9 PH |
2499 | |
2500 | /************************************************* | |
2501 | * Find if verified sender * | |
2502 | *************************************************/ | |
2503 | ||
2504 | /* Usually, just a single address is verified as the sender of the message. | |
2505 | However, Exim can be made to verify other addresses as well (often related in | |
2506 | some way), and this is useful in some environments. There may therefore be a | |
2507 | chain of such addresses that have previously been tested. This function finds | |
2508 | whether a given address is on the chain. | |
2509 | ||
2510 | Arguments: the address to be verified | |
2511 | Returns: pointer to an address item, or NULL | |
2512 | */ | |
2513 | ||
2514 | address_item * | |
2515 | verify_checked_sender(uschar *sender) | |
2516 | { | |
2517 | address_item *addr; | |
2518 | for (addr = sender_verified_list; addr != NULL; addr = addr->next) | |
2519 | if (Ustrcmp(sender, addr->address) == 0) break; | |
2520 | return addr; | |
2521 | } | |
2522 | ||
2523 | ||
2524 | ||
2525 | ||
2526 | ||
2527 | /************************************************* | |
2528 | * Get valid header address * | |
2529 | *************************************************/ | |
2530 | ||
2531 | /* Scan the originator headers of the message, looking for an address that | |
2532 | verifies successfully. RFC 822 says: | |
2533 | ||
2534 | o The "Sender" field mailbox should be sent notices of | |
2535 | any problems in transport or delivery of the original | |
2536 | messages. If there is no "Sender" field, then the | |
2537 | "From" field mailbox should be used. | |
2538 | ||
2539 | o If the "Reply-To" field exists, then the reply should | |
2540 | go to the addresses indicated in that field and not to | |
2541 | the address(es) indicated in the "From" field. | |
2542 | ||
2543 | So we check a Sender field if there is one, else a Reply_to field, else a From | |
2544 | field. As some strange messages may have more than one of these fields, | |
2545 | especially if they are resent- fields, check all of them if there is more than | |
2546 | one. | |
2547 | ||
2548 | Arguments: | |
2549 | user_msgptr points to where to put a user error message | |
2550 | log_msgptr points to where to put a log error message | |
2551 | callout timeout for callout check (passed to verify_address()) | |
2552 | callout_overall overall callout timeout (ditto) | |
8e669ac1 | 2553 | callout_connect connect callout timeout (ditto) |
059ec3d9 PH |
2554 | se_mailfrom mailfrom for verify; NULL => "" |
2555 | pm_mailfrom sender for pm callout check (passed to verify_address()) | |
2556 | options callout options (passed to verify_address()) | |
8e669ac1 | 2557 | verrno where to put the address basic_errno |
059ec3d9 PH |
2558 | |
2559 | If log_msgptr is set to something without setting user_msgptr, the caller | |
2560 | normally uses log_msgptr for both things. | |
2561 | ||
2562 | Returns: result of the verification attempt: OK, FAIL, or DEFER; | |
2563 | FAIL is given if no appropriate headers are found | |
2564 | */ | |
2565 | ||
2566 | int | |
2567 | verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr, | |
8e669ac1 | 2568 | int callout, int callout_overall, int callout_connect, uschar *se_mailfrom, |
fe5b5d0b | 2569 | uschar *pm_mailfrom, int options, int *verrno) |
059ec3d9 PH |
2570 | { |
2571 | static int header_types[] = { htype_sender, htype_reply_to, htype_from }; | |
1eccaa59 | 2572 | BOOL done = FALSE; |
059ec3d9 PH |
2573 | int yield = FAIL; |
2574 | int i; | |
2575 | ||
1eccaa59 | 2576 | for (i = 0; i < 3 && !done; i++) |
059ec3d9 PH |
2577 | { |
2578 | header_line *h; | |
1eccaa59 | 2579 | for (h = header_list; h != NULL && !done; h = h->next) |
059ec3d9 PH |
2580 | { |
2581 | int terminator, new_ok; | |
2582 | uschar *s, *ss, *endname; | |
2583 | ||
2584 | if (h->type != header_types[i]) continue; | |
2585 | s = endname = Ustrchr(h->text, ':') + 1; | |
2586 | ||
1eccaa59 PH |
2587 | /* Scan the addresses in the header, enabling group syntax. Note that we |
2588 | have to reset this after the header has been scanned. */ | |
2589 | ||
2590 | parse_allow_group = TRUE; | |
2591 | ||
059ec3d9 PH |
2592 | while (*s != 0) |
2593 | { | |
2594 | address_item *vaddr; | |
2595 | ||
2596 | while (isspace(*s) || *s == ',') s++; | |
2597 | if (*s == 0) break; /* End of header */ | |
2598 | ||
2599 | ss = parse_find_address_end(s, FALSE); | |
2600 | ||
2601 | /* The terminator is a comma or end of header, but there may be white | |
2602 | space preceding it (including newline for the last address). Move back | |
2603 | past any white space so we can check against any cached envelope sender | |
2604 | address verifications. */ | |
2605 | ||
2606 | while (isspace(ss[-1])) ss--; | |
2607 | terminator = *ss; | |
2608 | *ss = 0; | |
2609 | ||
2610 | HDEBUG(D_verify) debug_printf("verifying %.*s header address %s\n", | |
2611 | (int)(endname - h->text), h->text, s); | |
2612 | ||
2613 | /* See if we have already verified this address as an envelope sender, | |
2614 | and if so, use the previous answer. */ | |
2615 | ||
2616 | vaddr = verify_checked_sender(s); | |
2617 | ||
2618 | if (vaddr != NULL && /* Previously checked */ | |
2619 | (callout <= 0 || /* No callout needed; OR */ | |
2620 | vaddr->special_action > 256)) /* Callout was done */ | |
2621 | { | |
2622 | new_ok = vaddr->special_action & 255; | |
2623 | HDEBUG(D_verify) debug_printf("previously checked as envelope sender\n"); | |
2624 | *ss = terminator; /* Restore shortened string */ | |
2625 | } | |
2626 | ||
2627 | /* Otherwise we run the verification now. We must restore the shortened | |
2628 | string before running the verification, so the headers are correct, in | |
2629 | case there is any rewriting. */ | |
2630 | ||
2631 | else | |
2632 | { | |
2633 | int start, end, domain; | |
1eccaa59 PH |
2634 | uschar *address = parse_extract_address(s, log_msgptr, &start, &end, |
2635 | &domain, FALSE); | |
059ec3d9 PH |
2636 | |
2637 | *ss = terminator; | |
2638 | ||
1eccaa59 PH |
2639 | /* If we found an empty address, just carry on with the next one, but |
2640 | kill the message. */ | |
2641 | ||
2642 | if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0) | |
2643 | { | |
2644 | *log_msgptr = NULL; | |
2645 | s = ss; | |
2646 | continue; | |
2647 | } | |
2648 | ||
059ec3d9 PH |
2649 | /* If verification failed because of a syntax error, fail this |
2650 | function, and ensure that the failing address gets added to the error | |
2651 | message. */ | |
2652 | ||
2653 | if (address == NULL) | |
2654 | { | |
2655 | new_ok = FAIL; | |
1eccaa59 PH |
2656 | while (ss > s && isspace(ss[-1])) ss--; |
2657 | *log_msgptr = string_sprintf("syntax error in '%.*s' header when " | |
2658 | "scanning for sender: %s in \"%.*s\"", | |
2659 | endname - h->text, h->text, *log_msgptr, ss - s, s); | |
2660 | yield = FAIL; | |
2661 | done = TRUE; | |
2662 | break; | |
059ec3d9 PH |
2663 | } |
2664 | ||
2f6603e1 | 2665 | /* Else go ahead with the sender verification. But it isn't *the* |
059ec3d9 PH |
2666 | sender of the message, so set vopt_fake_sender to stop sender_address |
2667 | being replaced after rewriting or qualification. */ | |
2668 | ||
2669 | else | |
2670 | { | |
2671 | vaddr = deliver_make_addr(address, FALSE); | |
2672 | new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender, | |
8e669ac1 | 2673 | callout, callout_overall, callout_connect, se_mailfrom, |
4deaf07d | 2674 | pm_mailfrom, NULL); |
059ec3d9 PH |
2675 | } |
2676 | } | |
2677 | ||
2678 | /* We now have the result, either newly found, or cached. If we are | |
2679 | giving out error details, set a specific user error. This means that the | |
2680 | last of these will be returned to the user if all three fail. We do not | |
2681 | set a log message - the generic one below will be used. */ | |
2682 | ||
fe5b5d0b | 2683 | if (new_ok != OK) |
059ec3d9 | 2684 | { |
8e669ac1 | 2685 | *verrno = vaddr->basic_errno; |
fe5b5d0b PH |
2686 | if (smtp_return_error_details) |
2687 | { | |
2688 | *user_msgptr = string_sprintf("Rejected after DATA: " | |
2689 | "could not verify \"%.*s\" header address\n%s: %s", | |
2690 | endname - h->text, h->text, vaddr->address, vaddr->message); | |
2691 | } | |
8e669ac1 | 2692 | } |
059ec3d9 PH |
2693 | |
2694 | /* Success or defer */ | |
2695 | ||
1eccaa59 PH |
2696 | if (new_ok == OK) |
2697 | { | |
2698 | yield = OK; | |
2699 | done = TRUE; | |
2700 | break; | |
2701 | } | |
2702 | ||
059ec3d9 PH |
2703 | if (new_ok == DEFER) yield = DEFER; |
2704 | ||
2705 | /* Move on to any more addresses in the header */ | |
2706 | ||
2707 | s = ss; | |
1eccaa59 PH |
2708 | } /* Next address */ |
2709 | ||
2710 | parse_allow_group = FALSE; | |
2711 | parse_found_group = FALSE; | |
2712 | } /* Next header, unless done */ | |
2713 | } /* Next header type unless done */ | |
059ec3d9 PH |
2714 | |
2715 | if (yield == FAIL && *log_msgptr == NULL) | |
2716 | *log_msgptr = US"there is no valid sender in any header line"; | |
2717 | ||
2718 | if (yield == DEFER && *log_msgptr == NULL) | |
2719 | *log_msgptr = US"all attempts to verify a sender in a header line deferred"; | |
2720 | ||
2721 | return yield; | |
2722 | } | |
2723 | ||
2724 | ||
2725 | ||
2726 | ||
2727 | /************************************************* | |
2728 | * Get RFC 1413 identification * | |
2729 | *************************************************/ | |
2730 | ||
2731 | /* Attempt to get an id from the sending machine via the RFC 1413 protocol. If | |
2732 | the timeout is set to zero, then the query is not done. There may also be lists | |
2733 | of hosts and nets which are exempt. To guard against malefactors sending | |
2734 | non-printing characters which could, for example, disrupt a message's headers, | |
2735 | make sure the string consists of printing characters only. | |
2736 | ||
2737 | Argument: | |
2738 | port the port to connect to; usually this is IDENT_PORT (113), but when | |
2739 | running in the test harness with -bh a different value is used. | |
2740 | ||
2741 | Returns: nothing | |
2742 | ||
2743 | Side effect: any received ident value is put in sender_ident (NULL otherwise) | |
2744 | */ | |
2745 | ||
2746 | void | |
2747 | verify_get_ident(int port) | |
2748 | { | |
2749 | int sock, host_af, qlen; | |
2750 | int received_sender_port, received_interface_port, n; | |
2751 | uschar *p; | |
2752 | uschar buffer[2048]; | |
2753 | ||
2754 | /* Default is no ident. Check whether we want to do an ident check for this | |
2755 | host. */ | |
2756 | ||
2757 | sender_ident = NULL; | |
2758 | if (rfc1413_query_timeout <= 0 || verify_check_host(&rfc1413_hosts) != OK) | |
2759 | return; | |
2760 | ||
2761 | DEBUG(D_ident) debug_printf("doing ident callback\n"); | |
2762 | ||
2763 | /* Set up a connection to the ident port of the remote host. Bind the local end | |
2764 | to the incoming interface address. If the sender host address is an IPv6 | |
2765 | address, the incoming interface address will also be IPv6. */ | |
2766 | ||
2767 | host_af = (Ustrchr(sender_host_address, ':') == NULL)? AF_INET : AF_INET6; | |
2768 | sock = ip_socket(SOCK_STREAM, host_af); | |
2769 | if (sock < 0) return; | |
2770 | ||
2771 | if (ip_bind(sock, host_af, interface_address, 0) < 0) | |
2772 | { | |
2773 | DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n", | |
2774 | strerror(errno)); | |
2775 | goto END_OFF; | |
2776 | } | |
2777 | ||
2778 | if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout) | |
2779 | < 0) | |
2780 | { | |
2781 | if (errno == ETIMEDOUT && (log_extra_selector & LX_ident_timeout) != 0) | |
2782 | { | |
2783 | log_write(0, LOG_MAIN, "ident connection to %s timed out", | |
2784 | sender_host_address); | |
2785 | } | |
2786 | else | |
2787 | { | |
2788 | DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n", | |
2789 | sender_host_address, strerror(errno)); | |
2790 | } | |
2791 | goto END_OFF; | |
2792 | } | |
2793 | ||
2794 | /* Construct and send the query. */ | |
2795 | ||
2796 | sprintf(CS buffer, "%d , %d\r\n", sender_host_port, interface_port); | |
2797 | qlen = Ustrlen(buffer); | |
2798 | if (send(sock, buffer, qlen, 0) < 0) | |
2799 | { | |
2800 | DEBUG(D_ident) debug_printf("ident send failed: %s\n", strerror(errno)); | |
2801 | goto END_OFF; | |
2802 | } | |
2803 | ||
2804 | /* Read a response line. We put it into the rest of the buffer, using several | |
2805 | recv() calls if necessary. */ | |
2806 | ||
2807 | p = buffer + qlen; | |
2808 | ||
2809 | for (;;) | |
2810 | { | |
2811 | uschar *pp; | |
2812 | int count; | |
2813 | int size = sizeof(buffer) - (p - buffer); | |
2814 | ||
2815 | if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */ | |
2816 | count = ip_recv(sock, p, size, rfc1413_query_timeout); | |
2817 | if (count <= 0) goto END_OFF; /* Read error or EOF */ | |
2818 | ||
2819 | /* Scan what we just read, to see if we have reached the terminating \r\n. Be | |
2820 | generous, and accept a plain \n terminator as well. The only illegal | |
2821 | character is 0. */ | |
2822 | ||
2823 | for (pp = p; pp < p + count; pp++) | |
2824 | { | |
2825 | if (*pp == 0) goto END_OFF; /* Zero octet not allowed */ | |
2826 | if (*pp == '\n') | |
2827 | { | |
2828 | if (pp[-1] == '\r') pp--; | |
2829 | *pp = 0; | |
2830 | goto GOT_DATA; /* Break out of both loops */ | |
2831 | } | |
2832 | } | |
2833 | ||
2834 | /* Reached the end of the data without finding \n. Let the loop continue to | |
2835 | read some more, if there is room. */ | |
2836 | ||
2837 | p = pp; | |
2838 | } | |
2839 | ||
2840 | GOT_DATA: | |
2841 | ||
2842 | /* We have received a line of data. Check it carefully. It must start with the | |
2843 | same two port numbers that we sent, followed by data as defined by the RFC. For | |
2844 | example, | |
2845 | ||
2846 | 12345 , 25 : USERID : UNIX :root | |
2847 | ||
2848 | However, the amount of white space may be different to what we sent. In the | |
2849 | "osname" field there may be several sub-fields, comma separated. The data we | |
2850 | actually want to save follows the third colon. Some systems put leading spaces | |
2851 | in it - we discard those. */ | |
2852 | ||
2853 | if (sscanf(CS buffer + qlen, "%d , %d%n", &received_sender_port, | |
2854 | &received_interface_port, &n) != 2 || | |
2855 | received_sender_port != sender_host_port || | |
2856 | received_interface_port != interface_port) | |
2857 | goto END_OFF; | |
2858 | ||
2859 | p = buffer + qlen + n; | |
2860 | while(isspace(*p)) p++; | |
2861 | if (*p++ != ':') goto END_OFF; | |
2862 | while(isspace(*p)) p++; | |
2863 | if (Ustrncmp(p, "USERID", 6) != 0) goto END_OFF; | |
2864 | p += 6; | |
2865 | while(isspace(*p)) p++; | |
2866 | if (*p++ != ':') goto END_OFF; | |
2867 | while (*p != 0 && *p != ':') p++; | |
2868 | if (*p++ == 0) goto END_OFF; | |
2869 | while(isspace(*p)) p++; | |
2870 | if (*p == 0) goto END_OFF; | |
2871 | ||
2872 | /* The rest of the line is the data we want. We turn it into printing | |
2873 | characters when we save it, so that it cannot mess up the format of any logging | |
2874 | or Received: lines into which it gets inserted. We keep a maximum of 127 | |
2875 | characters. */ | |
2876 | ||
2877 | sender_ident = string_printing(string_copyn(p, 127)); | |
2878 | DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident); | |
2879 | ||
2880 | END_OFF: | |
f1e894f3 | 2881 | (void)close(sock); |
059ec3d9 PH |
2882 | return; |
2883 | } | |
2884 | ||
2885 | ||
2886 | ||
2887 | ||
2888 | /************************************************* | |
2889 | * Match host to a single host-list item * | |
2890 | *************************************************/ | |
2891 | ||
2892 | /* This function compares a host (name or address) against a single item | |
2893 | from a host list. The host name gets looked up if it is needed and is not | |
2894 | already known. The function is called from verify_check_this_host() via | |
2895 | match_check_list(), which is why most of its arguments are in a single block. | |
2896 | ||
2897 | Arguments: | |
2898 | arg the argument block (see below) | |
2899 | ss the host-list item | |
2900 | valueptr where to pass back looked up data, or NULL | |
2901 | error for error message when returning ERROR | |
2902 | ||
2903 | The block contains: | |
32d668a5 PH |
2904 | host_name (a) the host name, or |
2905 | (b) NULL, implying use sender_host_name and | |
2906 | sender_host_aliases, looking them up if required, or | |
2907 | (c) the empty string, meaning that only IP address matches | |
2908 | are permitted | |
059ec3d9 PH |
2909 | host_address the host address |
2910 | host_ipv4 the IPv4 address taken from an IPv6 one | |
2911 | ||
2912 | Returns: OK matched | |
2913 | FAIL did not match | |
2914 | DEFER lookup deferred | |
32d668a5 PH |
2915 | ERROR (a) failed to find the host name or IP address, or |
2916 | (b) unknown lookup type specified, or | |
2917 | (c) host name encountered when only IP addresses are | |
2918 | being matched | |
059ec3d9 PH |
2919 | */ |
2920 | ||
32d668a5 | 2921 | int |
059ec3d9 PH |
2922 | check_host(void *arg, uschar *ss, uschar **valueptr, uschar **error) |
2923 | { | |
2924 | check_host_block *cb = (check_host_block *)arg; | |
32d668a5 | 2925 | int mlen = -1; |
059ec3d9 | 2926 | int maskoffset; |
32d668a5 | 2927 | BOOL iplookup = FALSE; |
059ec3d9 | 2928 | BOOL isquery = FALSE; |
32d668a5 | 2929 | BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0; |
1688f43b | 2930 | uschar *t; |
32d668a5 | 2931 | uschar *semicolon; |
059ec3d9 PH |
2932 | uschar **aliases; |
2933 | ||
2934 | /* Optimize for the special case when the pattern is "*". */ | |
2935 | ||
2936 | if (*ss == '*' && ss[1] == 0) return OK; | |
2937 | ||
2938 | /* If the pattern is empty, it matches only in the case when there is no host - | |
2939 | this can occur in ACL checking for SMTP input using the -bs option. In this | |
2940 | situation, the host address is the empty string. */ | |
2941 | ||
2942 | if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL; | |
2943 | if (*ss == 0) return FAIL; | |
2944 | ||
32d668a5 PH |
2945 | /* If the pattern is precisely "@" then match against the primary host name, |
2946 | provided that host name matching is permitted; if it's "@[]" match against the | |
2947 | local host's IP addresses. */ | |
059ec3d9 PH |
2948 | |
2949 | if (*ss == '@') | |
2950 | { | |
32d668a5 PH |
2951 | if (ss[1] == 0) |
2952 | { | |
2953 | if (isiponly) return ERROR; | |
2954 | ss = primary_hostname; | |
2955 | } | |
059ec3d9 PH |
2956 | else if (Ustrcmp(ss, "@[]") == 0) |
2957 | { | |
2958 | ip_address_item *ip; | |
2959 | for (ip = host_find_interfaces(); ip != NULL; ip = ip->next) | |
2960 | if (Ustrcmp(ip->address, cb->host_address) == 0) return OK; | |
2961 | return FAIL; | |
2962 | } | |
2963 | } | |
2964 | ||
2965 | /* If the pattern is an IP address, optionally followed by a bitmask count, do | |
2966 | a (possibly masked) comparision with the current IP address. */ | |
2967 | ||
7e66e54d | 2968 | if (string_is_ip_address(ss, &maskoffset) != 0) |
059ec3d9 PH |
2969 | return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL); |
2970 | ||
1688f43b PH |
2971 | /* The pattern is not an IP address. A common error that people make is to omit |
2972 | one component of an IPv4 address, either by accident, or believing that, for | |
2973 | 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, | |
2974 | which it isn't. (Those applications that do accept 1.2.3 as an IP address | |
2975 | interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an | |
2976 | ancient specification.) To aid in debugging these cases, we give a specific | |
2977 | error if the pattern contains only digits and dots or contains a slash preceded | |
2978 | only by digits and dots (a slash at the start indicates a file name and of | |
2979 | course slashes may be present in lookups, but not preceded only by digits and | |
2980 | dots). */ | |
2981 | ||
2982 | for (t = ss; isdigit(*t) || *t == '.'; t++); | |
2983 | if (*t == 0 || (*t == '/' && t != ss)) | |
2984 | { | |
2985 | *error = US"malformed IPv4 address or address mask"; | |
2986 | return ERROR; | |
2987 | } | |
2988 | ||
32d668a5 | 2989 | /* See if there is a semicolon in the pattern */ |
059ec3d9 | 2990 | |
32d668a5 PH |
2991 | semicolon = Ustrchr(ss, ';'); |
2992 | ||
2993 | /* If we are doing an IP address only match, then all lookups must be IP | |
df199fec | 2994 | address lookups, even if there is no "net-". */ |
32d668a5 PH |
2995 | |
2996 | if (isiponly) | |
059ec3d9 | 2997 | { |
32d668a5 PH |
2998 | iplookup = semicolon != NULL; |
2999 | } | |
059ec3d9 | 3000 | |
32d668a5 | 3001 | /* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is |
df199fec PH |
3002 | a lookup on a masked IP network, in textual form. We obey this code even if we |
3003 | have already set iplookup, so as to skip over the "net-" prefix and to set the | |
3004 | mask length. The net- stuff really only applies to single-key lookups where the | |
3005 | key is implicit. For query-style lookups the key is specified in the query. | |
3006 | From release 4.30, the use of net- for query style is no longer needed, but we | |
3007 | retain it for backward compatibility. */ | |
3008 | ||
3009 | if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL) | |
32d668a5 PH |
3010 | { |
3011 | mlen = 0; | |
3012 | for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0'; | |
3013 | if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */ | |
3014 | iplookup = (*t++ == '-'); | |
3015 | } | |
1688f43b | 3016 | else t = ss; |
059ec3d9 | 3017 | |
32d668a5 | 3018 | /* Do the IP address lookup if that is indeed what we have */ |
059ec3d9 | 3019 | |
32d668a5 PH |
3020 | if (iplookup) |
3021 | { | |
3022 | int insize; | |
3023 | int search_type; | |
3024 | int incoming[4]; | |
3025 | void *handle; | |
3026 | uschar *filename, *key, *result; | |
3027 | uschar buffer[64]; | |
059ec3d9 | 3028 | |
32d668a5 | 3029 | /* Find the search type */ |
059ec3d9 | 3030 | |
32d668a5 | 3031 | search_type = search_findtype(t, semicolon - t); |
059ec3d9 | 3032 | |
32d668a5 PH |
3033 | if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", |
3034 | search_error_message); | |
059ec3d9 | 3035 | |
13b685f9 PH |
3036 | /* Adjust parameters for the type of lookup. For a query-style lookup, there |
3037 | is no file name, and the "key" is just the query. For query-style with a file | |
3038 | name, we have to fish the file off the start of the query. For a single-key | |
3039 | lookup, the key is the current IP address, masked appropriately, and | |
3040 | reconverted to text form, with the mask appended. For IPv6 addresses, specify | |
6a3bceb1 PH |
3041 | dot separators instead of colons, except when the lookup type is "iplsearch". |
3042 | */ | |
059ec3d9 | 3043 | |
13b685f9 PH |
3044 | if (mac_islookup(search_type, lookup_absfilequery)) |
3045 | { | |
3046 | filename = semicolon + 1; | |
3047 | key = filename; | |
3048 | while (*key != 0 && !isspace(*key)) key++; | |
3049 | filename = string_copyn(filename, key - filename); | |
3050 | while (isspace(*key)) key++; | |
3051 | } | |
3052 | else if (mac_islookup(search_type, lookup_querystyle)) | |
32d668a5 PH |
3053 | { |
3054 | filename = NULL; | |
3055 | key = semicolon + 1; | |
3056 | } | |
6a3bceb1 | 3057 | else /* Single-key style */ |
32d668a5 | 3058 | { |
e6d225ae | 3059 | int sep = (Ustrcmp(lookup_list[search_type]->name, "iplsearch") == 0)? |
6a3bceb1 | 3060 | ':' : '.'; |
32d668a5 PH |
3061 | insize = host_aton(cb->host_address, incoming); |
3062 | host_mask(insize, incoming, mlen); | |
6a3bceb1 | 3063 | (void)host_nmtoa(insize, incoming, mlen, buffer, sep); |
32d668a5 PH |
3064 | key = buffer; |
3065 | filename = semicolon + 1; | |
059ec3d9 | 3066 | } |
32d668a5 PH |
3067 | |
3068 | /* Now do the actual lookup; note that there is no search_close() because | |
3069 | of the caching arrangements. */ | |
3070 | ||
3071 | handle = search_open(filename, search_type, 0, NULL, NULL); | |
3072 | if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", | |
3073 | search_error_message); | |
3074 | result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL); | |
3075 | if (valueptr != NULL) *valueptr = result; | |
3076 | return (result != NULL)? OK : search_find_defer? DEFER: FAIL; | |
059ec3d9 PH |
3077 | } |
3078 | ||
3079 | /* The pattern is not an IP address or network reference of any kind. That is, | |
32d668a5 PH |
3080 | it is a host name pattern. If this is an IP only match, there's an error in the |
3081 | host list. */ | |
3082 | ||
3083 | if (isiponly) | |
3084 | { | |
3085 | *error = US"cannot match host name in match_ip list"; | |
3086 | return ERROR; | |
3087 | } | |
3088 | ||
3089 | /* Check the characters of the pattern to see if they comprise only letters, | |
3090 | digits, full stops, and hyphens (the constituents of domain names). Allow | |
3091 | underscores, as they are all too commonly found. Sigh. Also, if | |
3092 | allow_utf8_domains is set, allow top-bit characters. */ | |
059ec3d9 PH |
3093 | |
3094 | for (t = ss; *t != 0; t++) | |
3095 | if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' && | |
3096 | (!allow_utf8_domains || *t < 128)) break; | |
3097 | ||
3098 | /* If the pattern is a complete domain name, with no fancy characters, look up | |
3099 | its IP address and match against that. Note that a multi-homed host will add | |
3100 | items to the chain. */ | |
3101 | ||
3102 | if (*t == 0) | |
3103 | { | |
3104 | int rc; | |
3105 | host_item h; | |
3106 | h.next = NULL; | |
3107 | h.name = ss; | |
3108 | h.address = NULL; | |
3109 | h.mx = MX_NONE; | |
9b8fadde | 3110 | |
322050c2 | 3111 | rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE); |
059ec3d9 PH |
3112 | if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL) |
3113 | { | |
3114 | host_item *hh; | |
3115 | for (hh = &h; hh != NULL; hh = hh->next) | |
3116 | { | |
96776534 | 3117 | if (host_is_in_net(hh->address, cb->host_address, 0)) return OK; |
059ec3d9 PH |
3118 | } |
3119 | return FAIL; | |
3120 | } | |
3121 | if (rc == HOST_FIND_AGAIN) return DEFER; | |
3122 | *error = string_sprintf("failed to find IP address for %s", ss); | |
3123 | return ERROR; | |
3124 | } | |
3125 | ||
3126 | /* Almost all subsequent comparisons require the host name, and can be done | |
3127 | using the general string matching function. When this function is called for | |
3128 | outgoing hosts, the name is always given explicitly. If it is NULL, it means we | |
3129 | must use sender_host_name and its aliases, looking them up if necessary. */ | |
3130 | ||
3131 | if (cb->host_name != NULL) /* Explicit host name given */ | |
3132 | return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE, | |
3133 | valueptr); | |
3134 | ||
3135 | /* Host name not given; in principle we need the sender host name and its | |
3136 | aliases. However, for query-style lookups, we do not need the name if the | |
3137 | query does not contain $sender_host_name. From release 4.23, a reference to | |
3138 | $sender_host_name causes it to be looked up, so we don't need to do the lookup | |
3139 | on spec. */ | |
3140 | ||
3141 | if ((semicolon = Ustrchr(ss, ';')) != NULL) | |
3142 | { | |
3143 | uschar *affix; | |
3144 | int partial, affixlen, starflags, id; | |
3145 | ||
3146 | *semicolon = 0; | |
3147 | id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags); | |
3148 | *semicolon=';'; | |
3149 | ||
3150 | if (id < 0) /* Unknown lookup type */ | |
3151 | { | |
3152 | log_write(0, LOG_MAIN|LOG_PANIC, "%s in host list item \"%s\"", | |
3153 | search_error_message, ss); | |
3154 | return DEFER; | |
3155 | } | |
13b685f9 | 3156 | isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery); |
059ec3d9 PH |
3157 | } |
3158 | ||
3159 | if (isquery) | |
3160 | { | |
3161 | switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr)) | |
3162 | { | |
3163 | case OK: return OK; | |
3164 | case DEFER: return DEFER; | |
3165 | default: return FAIL; | |
3166 | } | |
3167 | } | |
3168 | ||
3169 | /* Not a query-style lookup; must ensure the host name is present, and then we | |
3170 | do a check on the name and all its aliases. */ | |
3171 | ||
3172 | if (sender_host_name == NULL) | |
3173 | { | |
3174 | HDEBUG(D_host_lookup) | |
3175 | debug_printf("sender host name required, to match against %s\n", ss); | |
3176 | if (host_lookup_failed || host_name_lookup() != OK) | |
3177 | { | |
3178 | *error = string_sprintf("failed to find host name for %s", | |
3179 | sender_host_address);; | |
3180 | return ERROR; | |
3181 | } | |
3182 | host_build_sender_fullhost(); | |
3183 | } | |
3184 | ||
3185 | /* Match on the sender host name, using the general matching function */ | |
3186 | ||
3187 | switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE, | |
3188 | valueptr)) | |
3189 | { | |
3190 | case OK: return OK; | |
3191 | case DEFER: return DEFER; | |
3192 | } | |
3193 | ||
3194 | /* If there are aliases, try matching on them. */ | |
3195 | ||
3196 | aliases = sender_host_aliases; | |
3197 | while (*aliases != NULL) | |
3198 | { | |
3199 | switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr)) | |
3200 | { | |
3201 | case OK: return OK; | |
3202 | case DEFER: return DEFER; | |
3203 | } | |
3204 | } | |
3205 | return FAIL; | |
3206 | } | |
3207 | ||
3208 | ||
3209 | ||
3210 | ||
3211 | /************************************************* | |
3212 | * Check a specific host matches a host list * | |
3213 | *************************************************/ | |
3214 | ||
3215 | /* This function is passed a host list containing items in a number of | |
3216 | different formats and the identity of a host. Its job is to determine whether | |
3217 | the given host is in the set of hosts defined by the list. The host name is | |
3218 | passed as a pointer so that it can be looked up if needed and not already | |
3219 | known. This is commonly the case when called from verify_check_host() to check | |
3220 | an incoming connection. When called from elsewhere the host name should usually | |
3221 | be set. | |
3222 | ||
3223 | This function is now just a front end to match_check_list(), which runs common | |
3224 | code for scanning a list. We pass it the check_host() function to perform a | |
3225 | single test. | |
3226 | ||
3227 | Arguments: | |
3228 | listptr pointer to the host list | |
3229 | cache_bits pointer to cache for named lists, or NULL | |
3230 | host_name the host name or NULL, implying use sender_host_name and | |
3231 | sender_host_aliases, looking them up if required | |
3232 | host_address the IP address | |
3233 | valueptr if not NULL, data from a lookup is passed back here | |
3234 | ||
3235 | Returns: OK if the host is in the defined set | |
3236 | FAIL if the host is not in the defined set, | |
3237 | DEFER if a data lookup deferred (not a host lookup) | |
3238 | ||
3239 | If the host name was needed in order to make a comparison, and could not be | |
3240 | determined from the IP address, the result is FAIL unless the item | |
3241 | "+allow_unknown" was met earlier in the list, in which case OK is returned. */ | |
3242 | ||
3243 | int | |
3244 | verify_check_this_host(uschar **listptr, unsigned int *cache_bits, | |
3245 | uschar *host_name, uschar *host_address, uschar **valueptr) | |
3246 | { | |
d4eb88df | 3247 | int rc; |
059ec3d9 | 3248 | unsigned int *local_cache_bits = cache_bits; |
d4eb88df | 3249 | uschar *save_host_address = deliver_host_address; |
059ec3d9 PH |
3250 | check_host_block cb; |
3251 | cb.host_name = host_name; | |
3252 | cb.host_address = host_address; | |
3253 | ||
3254 | if (valueptr != NULL) *valueptr = NULL; | |
3255 | ||
3256 | /* If the host address starts off ::ffff: it is an IPv6 address in | |
3257 | IPv4-compatible mode. Find the IPv4 part for checking against IPv4 | |
3258 | addresses. */ | |
3259 | ||
3260 | cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)? | |
3261 | host_address + 7 : host_address; | |
3262 | ||
8e669ac1 PH |
3263 | /* During the running of the check, put the IP address into $host_address. In |
3264 | the case of calls from the smtp transport, it will already be there. However, | |
3265 | in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on | |
d4eb88df PH |
3266 | the safe side, any existing setting is preserved, though as I write this |
3267 | (November 2004) I can't see any cases where it is actually needed. */ | |
3268 | ||
3269 | deliver_host_address = host_address; | |
3270 | rc = match_check_list( | |
3271 | listptr, /* the list */ | |
3272 | 0, /* separator character */ | |
3273 | &hostlist_anchor, /* anchor pointer */ | |
3274 | &local_cache_bits, /* cache pointer */ | |
3275 | check_host, /* function for testing */ | |
3276 | &cb, /* argument for function */ | |
3277 | MCL_HOST, /* type of check */ | |
8e669ac1 | 3278 | (host_address == sender_host_address)? |
d4eb88df PH |
3279 | US"host" : host_address, /* text for debugging */ |
3280 | valueptr); /* where to pass back data */ | |
3281 | deliver_host_address = save_host_address; | |
8e669ac1 | 3282 | return rc; |
059ec3d9 PH |
3283 | } |
3284 | ||
3285 | ||
3286 | ||
3287 | ||
5130845b JH |
3288 | /************************************************* |
3289 | * Check the given host item matches a list * | |
3290 | *************************************************/ | |
3291 | int | |
3292 | verify_check_given_host(uschar **listptr, host_item *host) | |
3293 | { | |
3294 | return verify_check_this_host(listptr, NULL, host->name, host->address, NULL); | |
3295 | } | |
3296 | ||
059ec3d9 PH |
3297 | /************************************************* |
3298 | * Check the remote host matches a list * | |
3299 | *************************************************/ | |
3300 | ||
3301 | /* This is a front end to verify_check_this_host(), created because checking | |
3302 | the remote host is a common occurrence. With luck, a good compiler will spot | |
3303 | the tail recursion and optimize it. If there's no host address, this is | |
3304 | command-line SMTP input - check against an empty string for the address. | |
3305 | ||
3306 | Arguments: | |
3307 | listptr pointer to the host list | |
3308 | ||
3309 | Returns: the yield of verify_check_this_host(), | |
3310 | i.e. OK, FAIL, or DEFER | |
3311 | */ | |
3312 | ||
3313 | int | |
3314 | verify_check_host(uschar **listptr) | |
3315 | { | |
3316 | return verify_check_this_host(listptr, sender_host_cache, NULL, | |
3317 | (sender_host_address == NULL)? US"" : sender_host_address, NULL); | |
3318 | } | |
3319 | ||
3320 | ||
3321 | ||
3322 | ||
3323 | ||
3324 | /************************************************* | |
83e029d5 | 3325 | * Invert an IP address * |
059ec3d9 PH |
3326 | *************************************************/ |
3327 | ||
83e029d5 PP |
3328 | /* Originally just used for DNS xBL lists, now also used for the |
3329 | reverse_ip expansion operator. | |
3330 | ||
059ec3d9 PH |
3331 | Arguments: |
3332 | buffer where to put the answer | |
3333 | address the address to invert | |
3334 | */ | |
3335 | ||
83e029d5 | 3336 | void |
059ec3d9 PH |
3337 | invert_address(uschar *buffer, uschar *address) |
3338 | { | |
3339 | int bin[4]; | |
3340 | uschar *bptr = buffer; | |
3341 | ||
3342 | /* If this is an IPv4 address mapped into IPv6 format, adjust the pointer | |
3343 | to the IPv4 part only. */ | |
3344 | ||
3345 | if (Ustrncmp(address, "::ffff:", 7) == 0) address += 7; | |
3346 | ||
3347 | /* Handle IPv4 address: when HAVE_IPV6 is false, the result of host_aton() is | |
3348 | always 1. */ | |
3349 | ||
3350 | if (host_aton(address, bin) == 1) | |
3351 | { | |
3352 | int i; | |
3353 | int x = bin[0]; | |
3354 | for (i = 0; i < 4; i++) | |
3355 | { | |
3356 | sprintf(CS bptr, "%d.", x & 255); | |
3357 | while (*bptr) bptr++; | |
3358 | x >>= 8; | |
3359 | } | |
3360 | } | |
3361 | ||
3362 | /* Handle IPv6 address. Actually, as far as I know, there are no IPv6 addresses | |
3363 | in any DNS black lists, and the format in which they will be looked up is | |
3364 | unknown. This is just a guess. */ | |
3365 | ||
3366 | #if HAVE_IPV6 | |
3367 | else | |
3368 | { | |
3369 | int i, j; | |
3370 | for (j = 3; j >= 0; j--) | |
3371 | { | |
3372 | int x = bin[j]; | |
3373 | for (i = 0; i < 8; i++) | |
3374 | { | |
3375 | sprintf(CS bptr, "%x.", x & 15); | |
3376 | while (*bptr) bptr++; | |
3377 | x >>= 4; | |
3378 | } | |
3379 | } | |
3380 | } | |
3381 | #endif | |
d6f6e0dc PH |
3382 | |
3383 | /* Remove trailing period -- this is needed so that both arbitrary | |
3384 | dnsbl keydomains and inverted addresses may be combined with the | |
3385 | same format string, "%s.%s" */ | |
3386 | ||
3387 | *(--bptr) = 0; | |
059ec3d9 PH |
3388 | } |
3389 | ||
3390 | ||
3391 | ||
0bcb2a0e PH |
3392 | /************************************************* |
3393 | * Perform a single dnsbl lookup * | |
3394 | *************************************************/ | |
3395 | ||
d6f6e0dc PH |
3396 | /* This function is called from verify_check_dnsbl() below. It is also called |
3397 | recursively from within itself when domain and domain_txt are different | |
3398 | pointers, in order to get the TXT record from the alternate domain. | |
0bcb2a0e PH |
3399 | |
3400 | Arguments: | |
d6f6e0dc PH |
3401 | domain the outer dnsbl domain |
3402 | domain_txt alternate domain to lookup TXT record on success; when the | |
3403 | same domain is to be used, domain_txt == domain (that is, | |
3404 | the pointers must be identical, not just the text) | |
8e669ac1 | 3405 | keydomain the current keydomain (for debug message) |
d6f6e0dc PH |
3406 | prepend subdomain to lookup (like keydomain, but |
3407 | reversed if IP address) | |
3408 | iplist the list of matching IP addresses, or NULL for "any" | |
8e669ac1 | 3409 | bitmask true if bitmask matching is wanted |
431b7361 PH |
3410 | match_type condition for 'succeed' result |
3411 | 0 => Any RR in iplist (=) | |
3412 | 1 => No RR in iplist (!=) | |
3413 | 2 => All RRs in iplist (==) | |
3414 | 3 => Some RRs not in iplist (!==) | |
3415 | the two bits are defined as MT_NOT and MT_ALL | |
8e669ac1 | 3416 | defer_return what to return for a defer |
0bcb2a0e PH |
3417 | |
3418 | Returns: OK if lookup succeeded | |
3419 | FAIL if not | |
3420 | */ | |
3421 | ||
3422 | static int | |
d6f6e0dc | 3423 | one_check_dnsbl(uschar *domain, uschar *domain_txt, uschar *keydomain, |
431b7361 | 3424 | uschar *prepend, uschar *iplist, BOOL bitmask, int match_type, |
d6f6e0dc | 3425 | int defer_return) |
8e669ac1 | 3426 | { |
0bcb2a0e PH |
3427 | dns_answer dnsa; |
3428 | dns_scan dnss; | |
3429 | tree_node *t; | |
3430 | dnsbl_cache_block *cb; | |
3431 | int old_pool = store_pool; | |
d6f6e0dc PH |
3432 | uschar query[256]; /* DNS domain max length */ |
3433 | ||
3434 | /* Construct the specific query domainname */ | |
3435 | ||
3436 | if (!string_format(query, sizeof(query), "%s.%s", prepend, domain)) | |
3437 | { | |
3438 | log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long " | |
3439 | "(ignored): %s...", query); | |
3440 | return FAIL; | |
3441 | } | |
0bcb2a0e PH |
3442 | |
3443 | /* Look for this query in the cache. */ | |
3444 | ||
3445 | t = tree_search(dnsbl_cache, query); | |
3446 | ||
3447 | /* If not cached from a previous lookup, we must do a DNS lookup, and | |
3448 | cache the result in permanent memory. */ | |
3449 | ||
3450 | if (t == NULL) | |
3451 | { | |
3452 | store_pool = POOL_PERM; | |
3453 | ||
3454 | /* Set up a tree entry to cache the lookup */ | |
3455 | ||
3456 | t = store_get(sizeof(tree_node) + Ustrlen(query)); | |
3457 | Ustrcpy(t->name, query); | |
3458 | t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block)); | |
3459 | (void)tree_insertnode(&dnsbl_cache, t); | |
3460 | ||
3461 | /* Do the DNS loopup . */ | |
3462 | ||
3463 | HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query); | |
3464 | cb->rc = dns_basic_lookup(&dnsa, query, T_A); | |
3465 | cb->text_set = FALSE; | |
3466 | cb->text = NULL; | |
3467 | cb->rhs = NULL; | |
3468 | ||
3469 | /* If the lookup succeeded, cache the RHS address. The code allows for | |
3470 | more than one address - this was for complete generality and the possible | |
3471 | use of A6 records. However, A6 records have been reduced to experimental | |
3472 | status (August 2001) and may die out. So they may never get used at all, | |
3473 | let alone in dnsbl records. However, leave the code here, just in case. | |
3474 | ||
3475 | Quite apart from one A6 RR generating multiple addresses, there are DNS | |
3476 | lists that return more than one A record, so we must handle multiple | |
3477 | addresses generated in that way as well. */ | |
3478 | ||
3479 | if (cb->rc == DNS_SUCCEED) | |
3480 | { | |
3481 | dns_record *rr; | |
3482 | dns_address **addrp = &(cb->rhs); | |
3483 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
3484 | rr != NULL; | |
3485 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
3486 | { | |
3487 | if (rr->type == T_A) | |
3488 | { | |
3489 | dns_address *da = dns_address_from_rr(&dnsa, rr); | |
3490 | if (da != NULL) | |
3491 | { | |
3492 | *addrp = da; | |
3493 | while (da->next != NULL) da = da->next; | |
3494 | addrp = &(da->next); | |
3495 | } | |
3496 | } | |
3497 | } | |
3498 | ||
3499 | /* If we didn't find any A records, change the return code. This can | |
3500 | happen when there is a CNAME record but there are no A records for what | |
3501 | it points to. */ | |
3502 | ||
3503 | if (cb->rhs == NULL) cb->rc = DNS_NODATA; | |
3504 | } | |
3505 | ||
3506 | store_pool = old_pool; | |
3507 | } | |
3508 | ||
3509 | /* Previous lookup was cached */ | |
3510 | ||
3511 | else | |
3512 | { | |
3513 | HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n"); | |
3514 | cb = t->data.ptr; | |
3515 | } | |
3516 | ||
3517 | /* We now have the result of the DNS lookup, either newly done, or cached | |
3518 | from a previous call. If the lookup succeeded, check against the address | |
3519 | list if there is one. This may be a positive equality list (introduced by | |
3520 | "="), a negative equality list (introduced by "!="), a positive bitmask | |
3521 | list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/ | |
3522 | ||
3523 | if (cb->rc == DNS_SUCCEED) | |
3524 | { | |
3525 | dns_address *da = NULL; | |
3526 | uschar *addlist = cb->rhs->address; | |
3527 | ||
3528 | /* For A and AAAA records, there may be multiple addresses from multiple | |
3529 | records. For A6 records (currently not expected to be used) there may be | |
3530 | multiple addresses from a single record. */ | |
3531 | ||
3532 | for (da = cb->rhs->next; da != NULL; da = da->next) | |
3533 | addlist = string_sprintf("%s, %s", addlist, da->address); | |
3534 | ||
3535 | HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n", | |
3536 | query, addlist); | |
3537 | ||
3538 | /* Address list check; this can be either for equality, or via a bitmask. | |
3539 | In the latter case, all the bits must match. */ | |
3540 | ||
3541 | if (iplist != NULL) | |
3542 | { | |
431b7361 | 3543 | for (da = cb->rhs; da != NULL; da = da->next) |
0bcb2a0e | 3544 | { |
431b7361 PH |
3545 | int ipsep = ','; |
3546 | uschar ip[46]; | |
3547 | uschar *ptr = iplist; | |
3548 | uschar *res; | |
3549 | ||
0bcb2a0e | 3550 | /* Handle exact matching */ |
431b7361 | 3551 | |
0bcb2a0e PH |
3552 | if (!bitmask) |
3553 | { | |
431b7361 | 3554 | while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL) |
0bcb2a0e PH |
3555 | { |
3556 | if (Ustrcmp(CS da->address, ip) == 0) break; | |
3557 | } | |
3558 | } | |
431b7361 | 3559 | |
0bcb2a0e | 3560 | /* Handle bitmask matching */ |
431b7361 | 3561 | |
0bcb2a0e PH |
3562 | else |
3563 | { | |
3564 | int address[4]; | |
3565 | int mask = 0; | |
3566 | ||
3567 | /* At present, all known DNS blocking lists use A records, with | |
3568 | IPv4 addresses on the RHS encoding the information they return. I | |
3569 | wonder if this will linger on as the last vestige of IPv4 when IPv6 | |
3570 | is ubiquitous? Anyway, for now we use paranoia code to completely | |
3571 | ignore IPv6 addresses. The default mask is 0, which always matches. | |
3572 | We change this only for IPv4 addresses in the list. */ | |
3573 | ||
431b7361 | 3574 | if (host_aton(da->address, address) == 1) mask = address[0]; |
0bcb2a0e PH |
3575 | |
3576 | /* Scan the returned addresses, skipping any that are IPv6 */ | |
3577 | ||
431b7361 | 3578 | while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL) |
0bcb2a0e | 3579 | { |
431b7361 PH |
3580 | if (host_aton(ip, address) != 1) continue; |
3581 | if ((address[0] & mask) == address[0]) break; | |
0bcb2a0e PH |
3582 | } |
3583 | } | |
3584 | ||
431b7361 PH |
3585 | /* If either |
3586 | ||
3587 | (a) An IP address in an any ('=') list matched, or | |
3588 | (b) No IP address in an all ('==') list matched | |
0bcb2a0e | 3589 | |
431b7361 PH |
3590 | then we're done searching. */ |
3591 | ||
3592 | if (((match_type & MT_ALL) != 0) == (res == NULL)) break; | |
0bcb2a0e PH |
3593 | } |
3594 | ||
431b7361 | 3595 | /* If da == NULL, either |
0bcb2a0e | 3596 | |
431b7361 PH |
3597 | (a) No IP address in an any ('=') list matched, or |
3598 | (b) An IP address in an all ('==') list didn't match | |
0bcb2a0e | 3599 | |
431b7361 PH |
3600 | so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on |
3601 | the list. */ | |
0bcb2a0e | 3602 | |
431b7361 | 3603 | if ((match_type == MT_NOT || match_type == MT_ALL) != (da == NULL)) |
0bcb2a0e PH |
3604 | { |
3605 | HDEBUG(D_dnsbl) | |
3606 | { | |
431b7361 PH |
3607 | uschar *res = NULL; |
3608 | switch(match_type) | |
3609 | { | |
3610 | case 0: | |
3611 | res = US"was no match"; | |
3612 | break; | |
3613 | case MT_NOT: | |
3614 | res = US"was an exclude match"; | |
3615 | break; | |
3616 | case MT_ALL: | |
3617 | res = US"was an IP address that did not match"; | |
3618 | break; | |
3619 | case MT_NOT|MT_ALL: | |
3620 | res = US"were no IP addresses that did not match"; | |
3621 | break; | |
3622 | } | |
0bcb2a0e | 3623 | debug_printf("=> but we are not accepting this block class because\n"); |
431b7361 PH |
3624 | debug_printf("=> there %s for %s%c%s\n", |
3625 | res, | |
3626 | ((match_type & MT_ALL) == 0)? "" : "=", | |
3627 | bitmask? '&' : '=', iplist); | |
0bcb2a0e | 3628 | } |
8e669ac1 | 3629 | return FAIL; |
0bcb2a0e PH |
3630 | } |
3631 | } | |
3632 | ||
d6f6e0dc PH |
3633 | /* Either there was no IP list, or the record matched, implying that the |
3634 | domain is on the list. We now want to find a corresponding TXT record. If an | |
3635 | alternate domain is specified for the TXT record, call this function | |
3636 | recursively to look that up; this has the side effect of re-checking that | |
3637 | there is indeed an A record at the alternate domain. */ | |
3638 | ||
3639 | if (domain_txt != domain) | |
3640 | return one_check_dnsbl(domain_txt, domain_txt, keydomain, prepend, NULL, | |
431b7361 | 3641 | FALSE, match_type, defer_return); |
d6f6e0dc PH |
3642 | |
3643 | /* If there is no alternate domain, look up a TXT record in the main domain | |
3644 | if it has not previously been cached. */ | |
0bcb2a0e PH |
3645 | |
3646 | if (!cb->text_set) | |
3647 | { | |
3648 | cb->text_set = TRUE; | |
3649 | if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED) | |
3650 | { | |
3651 | dns_record *rr; | |
3652 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
3653 | rr != NULL; | |
3654 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
3655 | if (rr->type == T_TXT) break; | |
3656 | if (rr != NULL) | |
3657 | { | |
3658 | int len = (rr->data)[0]; | |
3659 | if (len > 511) len = 127; | |
3660 | store_pool = POOL_PERM; | |
3661 | cb->text = string_sprintf("%.*s", len, (const uschar *)(rr->data+1)); | |
3662 | store_pool = old_pool; | |
3663 | } | |
3664 | } | |
3665 | } | |
3666 | ||
3667 | dnslist_value = addlist; | |
3668 | dnslist_text = cb->text; | |
3669 | return OK; | |
3670 | } | |
3671 | ||
3672 | /* There was a problem with the DNS lookup */ | |
3673 | ||
3674 | if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA) | |
3675 | { | |
3676 | log_write(L_dnslist_defer, LOG_MAIN, | |
3677 | "DNS list lookup defer (probably timeout) for %s: %s", query, | |
3678 | (defer_return == OK)? US"assumed in list" : | |
3679 | (defer_return == FAIL)? US"assumed not in list" : | |
3680 | US"returned DEFER"); | |
3681 | return defer_return; | |
3682 | } | |
3683 | ||
3684 | /* No entry was found in the DNS; continue for next domain */ | |
3685 | ||
3686 | HDEBUG(D_dnsbl) | |
3687 | { | |
3688 | debug_printf("DNS lookup for %s failed\n", query); | |
3689 | debug_printf("=> that means %s is not listed at %s\n", | |
3690 | keydomain, domain); | |
3691 | } | |
3692 | ||
3693 | return FAIL; | |
3694 | } | |
3695 | ||
3696 | ||
3697 | ||
3698 | ||
059ec3d9 PH |
3699 | /************************************************* |
3700 | * Check host against DNS black lists * | |
3701 | *************************************************/ | |
3702 | ||
3703 | /* This function runs checks against a list of DNS black lists, until one | |
3704 | matches. Each item on the list can be of the form | |
3705 | ||
3706 | domain=ip-address/key | |
3707 | ||
3708 | The domain is the right-most domain that is used for the query, for example, | |
3709 | blackholes.mail-abuse.org. If the IP address is present, there is a match only | |
3710 | if the DNS lookup returns a matching IP address. Several addresses may be | |
3711 | given, comma-separated, for example: x.y.z=127.0.0.1,127.0.0.2. | |
3712 | ||
3713 | If no key is given, what is looked up in the domain is the inverted IP address | |
3714 | of the current client host. If a key is given, it is used to construct the | |
d6f6e0dc | 3715 | domain for the lookup. For example: |
059ec3d9 PH |
3716 | |
3717 | dsn.rfc-ignorant.org/$sender_address_domain | |
3718 | ||
3719 | After finding a match in the DNS, the domain is placed in $dnslist_domain, and | |
3720 | then we check for a TXT record for an error message, and if found, save its | |
3721 | value in $dnslist_text. We also cache everything in a tree, to optimize | |
3722 | multiple lookups. | |
3723 | ||
d6f6e0dc PH |
3724 | The TXT record is normally looked up in the same domain as the A record, but |
3725 | when many lists are combined in a single DNS domain, this will not be a very | |
3726 | specific message. It is possible to specify a different domain for looking up | |
3727 | TXT records; this is given before the main domain, comma-separated. For | |
3728 | example: | |
3729 | ||
3730 | dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \ | |
3731 | socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3 | |
3732 | ||
3733 | The caching ensures that only one lookup in dnsbl.sorbs.net is done. | |
3734 | ||
059ec3d9 PH |
3735 | Note: an address for testing RBL is 192.203.178.39 |
3736 | Note: an address for testing DUL is 192.203.178.4 | |
3737 | Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org | |
3738 | ||
3739 | Arguments: | |
3740 | listptr the domain/address/data list | |
3741 | ||
3742 | Returns: OK successful lookup (i.e. the address is on the list), or | |
3743 | lookup deferred after +include_unknown | |
3744 | FAIL name not found, or no data found for the given type, or | |
3745 | lookup deferred after +exclude_unknown (default) | |
3746 | DEFER lookup failure, if +defer_unknown was set | |
3747 | */ | |
3748 | ||
3749 | int | |
3750 | verify_check_dnsbl(uschar **listptr) | |
3751 | { | |
3752 | int sep = 0; | |
3753 | int defer_return = FAIL; | |
059ec3d9 PH |
3754 | uschar *list = *listptr; |
3755 | uschar *domain; | |
3756 | uschar *s; | |
3757 | uschar buffer[1024]; | |
059ec3d9 PH |
3758 | uschar revadd[128]; /* Long enough for IPv6 address */ |
3759 | ||
3760 | /* Indicate that the inverted IP address is not yet set up */ | |
3761 | ||
3762 | revadd[0] = 0; | |
3763 | ||
0bcb2a0e PH |
3764 | /* In case this is the first time the DNS resolver is being used. */ |
3765 | ||
8c51eead | 3766 | dns_init(FALSE, FALSE, FALSE); /*XXX dnssec? */ |
0bcb2a0e | 3767 | |
059ec3d9 PH |
3768 | /* Loop through all the domains supplied, until something matches */ |
3769 | ||
3770 | while ((domain = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL) | |
3771 | { | |
0bcb2a0e | 3772 | int rc; |
059ec3d9 | 3773 | BOOL bitmask = FALSE; |
431b7361 | 3774 | int match_type = 0; |
d6f6e0dc PH |
3775 | uschar *domain_txt; |
3776 | uschar *comma; | |
059ec3d9 PH |
3777 | uschar *iplist; |
3778 | uschar *key; | |
059ec3d9 PH |
3779 | |
3780 | HDEBUG(D_dnsbl) debug_printf("DNS list check: %s\n", domain); | |
3781 | ||
3782 | /* Deal with special values that change the behaviour on defer */ | |
3783 | ||
3784 | if (domain[0] == '+') | |
3785 | { | |
3786 | if (strcmpic(domain, US"+include_unknown") == 0) defer_return = OK; | |
3787 | else if (strcmpic(domain, US"+exclude_unknown") == 0) defer_return = FAIL; | |
3788 | else if (strcmpic(domain, US"+defer_unknown") == 0) defer_return = DEFER; | |
3789 | else | |
3790 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown item in dnslist (ignored): %s", | |
3791 | domain); | |
3792 | continue; | |
3793 | } | |
3794 | ||
3795 | /* See if there's explicit data to be looked up */ | |
3796 | ||
3797 | key = Ustrchr(domain, '/'); | |
3798 | if (key != NULL) *key++ = 0; | |
3799 | ||
3800 | /* See if there's a list of addresses supplied after the domain name. This is | |
431b7361 PH |
3801 | introduced by an = or a & character; if preceded by = we require all matches |
3802 | and if preceded by ! we invert the result. */ | |
059ec3d9 PH |
3803 | |
3804 | iplist = Ustrchr(domain, '='); | |
3805 | if (iplist == NULL) | |
3806 | { | |
3807 | bitmask = TRUE; | |
3808 | iplist = Ustrchr(domain, '&'); | |
3809 | } | |
3810 | ||
431b7361 | 3811 | if (iplist != NULL) /* Found either = or & */ |
059ec3d9 | 3812 | { |
431b7361 | 3813 | if (iplist > domain && iplist[-1] == '!') /* Handle preceding ! */ |
059ec3d9 | 3814 | { |
431b7361 | 3815 | match_type |= MT_NOT; |
059ec3d9 PH |
3816 | iplist[-1] = 0; |
3817 | } | |
431b7361 PH |
3818 | |
3819 | *iplist++ = 0; /* Terminate domain, move on */ | |
3820 | ||
3821 | /* If we found = (bitmask == FALSE), check for == or =& */ | |
3822 | ||
3823 | if (!bitmask && (*iplist == '=' || *iplist == '&')) | |
3824 | { | |
3825 | bitmask = *iplist++ == '&'; | |
3826 | match_type |= MT_ALL; | |
3827 | } | |
059ec3d9 PH |
3828 | } |
3829 | ||
d6f6e0dc PH |
3830 | /* If there is a comma in the domain, it indicates that a second domain for |
3831 | looking up TXT records is provided, before the main domain. Otherwise we must | |
3832 | set domain_txt == domain. */ | |
3833 | ||
3834 | domain_txt = domain; | |
3835 | comma = Ustrchr(domain, ','); | |
3836 | if (comma != NULL) | |
3837 | { | |
3838 | *comma++ = 0; | |
3839 | domain = comma; | |
3840 | } | |
3841 | ||
059ec3d9 PH |
3842 | /* Check that what we have left is a sensible domain name. There is no reason |
3843 | why these domains should in fact use the same syntax as hosts and email | |
3844 | domains, but in practice they seem to. However, there is little point in | |
3845 | actually causing an error here, because that would no doubt hold up incoming | |
3846 | mail. Instead, I'll just log it. */ | |
3847 | ||
3848 | for (s = domain; *s != 0; s++) | |
3849 | { | |
09dcaba9 | 3850 | if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_') |
059ec3d9 PH |
3851 | { |
3852 | log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains " | |
3853 | "strange characters - is this right?", domain); | |
3854 | break; | |
3855 | } | |
3856 | } | |
3857 | ||
d6f6e0dc PH |
3858 | /* Check the alternate domain if present */ |
3859 | ||
3860 | if (domain_txt != domain) for (s = domain_txt; *s != 0; s++) | |
3861 | { | |
09dcaba9 | 3862 | if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_') |
d6f6e0dc PH |
3863 | { |
3864 | log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains " | |
3865 | "strange characters - is this right?", domain_txt); | |
3866 | break; | |
3867 | } | |
3868 | } | |
3869 | ||
8e669ac1 | 3870 | /* If there is no key string, construct the query by adding the domain name |
0bcb2a0e | 3871 | onto the inverted host address, and perform a single DNS lookup. */ |
8e669ac1 | 3872 | |
059ec3d9 PH |
3873 | if (key == NULL) |
3874 | { | |
3875 | if (sender_host_address == NULL) return FAIL; /* can never match */ | |
3876 | if (revadd[0] == 0) invert_address(revadd, sender_host_address); | |
d6f6e0dc | 3877 | rc = one_check_dnsbl(domain, domain_txt, sender_host_address, revadd, |
431b7361 | 3878 | iplist, bitmask, match_type, defer_return); |
0bcb2a0e PH |
3879 | if (rc == OK) |
3880 | { | |
d6f6e0dc | 3881 | dnslist_domain = string_copy(domain_txt); |
93655c46 | 3882 | dnslist_matched = string_copy(sender_host_address); |
8e669ac1 | 3883 | HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n", |
d6f6e0dc | 3884 | sender_host_address, dnslist_domain); |
0bcb2a0e | 3885 | } |
0bcb2a0e | 3886 | if (rc != FAIL) return rc; /* OK or DEFER */ |
059ec3d9 | 3887 | } |
8e669ac1 PH |
3888 | |
3889 | /* If there is a key string, it can be a list of domains or IP addresses to | |
0bcb2a0e | 3890 | be concatenated with the main domain. */ |
8e669ac1 | 3891 | |
059ec3d9 PH |
3892 | else |
3893 | { | |
0bcb2a0e | 3894 | int keysep = 0; |
8e669ac1 PH |
3895 | BOOL defer = FALSE; |
3896 | uschar *keydomain; | |
0bcb2a0e | 3897 | uschar keybuffer[256]; |
d6f6e0dc | 3898 | uschar keyrevadd[128]; |
8e669ac1 PH |
3899 | |
3900 | while ((keydomain = string_nextinlist(&key, &keysep, keybuffer, | |
0bcb2a0e | 3901 | sizeof(keybuffer))) != NULL) |
8e669ac1 | 3902 | { |
d6f6e0dc PH |
3903 | uschar *prepend = keydomain; |
3904 | ||
7e66e54d | 3905 | if (string_is_ip_address(keydomain, NULL) != 0) |
059ec3d9 | 3906 | { |
0bcb2a0e | 3907 | invert_address(keyrevadd, keydomain); |
d6f6e0dc | 3908 | prepend = keyrevadd; |
059ec3d9 | 3909 | } |
8e669ac1 | 3910 | |
d6f6e0dc | 3911 | rc = one_check_dnsbl(domain, domain_txt, keydomain, prepend, iplist, |
431b7361 | 3912 | bitmask, match_type, defer_return); |
8e669ac1 | 3913 | |
0bcb2a0e | 3914 | if (rc == OK) |
059ec3d9 | 3915 | { |
d6f6e0dc | 3916 | dnslist_domain = string_copy(domain_txt); |
93655c46 | 3917 | dnslist_matched = string_copy(keydomain); |
8e669ac1 | 3918 | HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n", |
d6f6e0dc | 3919 | keydomain, dnslist_domain); |
8e669ac1 | 3920 | return OK; |
059ec3d9 | 3921 | } |
8e669ac1 | 3922 | |
c38d6da9 PH |
3923 | /* If the lookup deferred, remember this fact. We keep trying the rest |
3924 | of the list to see if we get a useful result, and if we don't, we return | |
3925 | DEFER at the end. */ | |
059ec3d9 | 3926 | |
c38d6da9 | 3927 | if (rc == DEFER) defer = TRUE; |
0bcb2a0e | 3928 | } /* continue with next keystring domain/address */ |
c38d6da9 PH |
3929 | |
3930 | if (defer) return DEFER; | |
8e669ac1 | 3931 | } |
0bcb2a0e | 3932 | } /* continue with next dnsdb outer domain */ |
059ec3d9 PH |
3933 | |
3934 | return FAIL; | |
3935 | } | |
3936 | ||
511a6c14 JH |
3937 | /* vi: aw ai sw=2 |
3938 | */ | |
059ec3d9 | 3939 | /* End of verify.c */ |