Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
80fea873 | 5 | /* Copyright (c) University of Cambridge 1995 - 2016 */ |
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 { | |
14b3c5bc | 24 | time_t expiry; |
059ec3d9 PH |
25 | dns_address *rhs; |
26 | uschar *text; | |
27 | int rc; | |
28 | BOOL text_set; | |
29 | } dnsbl_cache_block; | |
30 | ||
31 | ||
32 | /* Anchor for DNSBL cache */ | |
33 | ||
34 | static tree_node *dnsbl_cache = NULL; | |
35 | ||
36 | ||
431b7361 PH |
37 | /* Bits for match_type in one_check_dnsbl() */ |
38 | ||
39 | #define MT_NOT 1 | |
40 | #define MT_ALL 2 | |
41 | ||
2760b518 | 42 | static uschar cutthrough_response(char, uschar **, int); |
431b7361 | 43 | |
8d330698 | 44 | |
059ec3d9 PH |
45 | |
46 | /************************************************* | |
47 | * Retrieve a callout cache record * | |
48 | *************************************************/ | |
49 | ||
50 | /* If a record exists, check whether it has expired. | |
51 | ||
52 | Arguments: | |
53 | dbm_file an open hints file | |
54 | key the record key | |
55 | type "address" or "domain" | |
56 | positive_expire expire time for positive records | |
57 | negative_expire expire time for negative records | |
58 | ||
59 | Returns: the cache record if a non-expired one exists, else NULL | |
60 | */ | |
61 | ||
62 | static dbdata_callout_cache * | |
55414b25 | 63 | get_callout_cache_record(open_db *dbm_file, const uschar *key, uschar *type, |
059ec3d9 PH |
64 | int positive_expire, int negative_expire) |
65 | { | |
66 | BOOL negative; | |
67 | int length, expire; | |
68 | time_t now; | |
69 | dbdata_callout_cache *cache_record; | |
70 | ||
71 | cache_record = dbfn_read_with_length(dbm_file, key, &length); | |
72 | ||
73 | if (cache_record == NULL) | |
74 | { | |
6f4d5ad3 | 75 | HDEBUG(D_verify) debug_printf("callout cache: no %s record found for %s\n", type, key); |
059ec3d9 PH |
76 | return NULL; |
77 | } | |
78 | ||
79 | /* We treat a record as "negative" if its result field is not positive, or if | |
80 | it is a domain record and the postmaster field is negative. */ | |
81 | ||
82 | negative = cache_record->result != ccache_accept || | |
83 | (type[0] == 'd' && cache_record->postmaster_result == ccache_reject); | |
84 | expire = negative? negative_expire : positive_expire; | |
85 | now = time(NULL); | |
86 | ||
87 | if (now - cache_record->time_stamp > expire) | |
88 | { | |
6f4d5ad3 | 89 | HDEBUG(D_verify) debug_printf("callout cache: %s record expired for %s\n", type, key); |
059ec3d9 PH |
90 | return NULL; |
91 | } | |
92 | ||
93 | /* If this is a non-reject domain record, check for the obsolete format version | |
94 | that doesn't have the postmaster and random timestamps, by looking at the | |
95 | length. If so, copy it to a new-style block, replicating the record's | |
96 | timestamp. Then check the additional timestamps. (There's no point wasting | |
97 | effort if connections are rejected.) */ | |
98 | ||
99 | if (type[0] == 'd' && cache_record->result != ccache_reject) | |
100 | { | |
101 | if (length == sizeof(dbdata_callout_cache_obs)) | |
102 | { | |
103 | dbdata_callout_cache *new = store_get(sizeof(dbdata_callout_cache)); | |
104 | memcpy(new, cache_record, length); | |
105 | new->postmaster_stamp = new->random_stamp = new->time_stamp; | |
106 | cache_record = new; | |
107 | } | |
108 | ||
109 | if (now - cache_record->postmaster_stamp > expire) | |
110 | cache_record->postmaster_result = ccache_unknown; | |
111 | ||
112 | if (now - cache_record->random_stamp > expire) | |
113 | cache_record->random_result = ccache_unknown; | |
114 | } | |
115 | ||
6f4d5ad3 | 116 | HDEBUG(D_verify) debug_printf("callout cache: found %s record for %s\n", type, key); |
059ec3d9 PH |
117 | return cache_record; |
118 | } | |
119 | ||
120 | ||
121 | ||
122 | /************************************************* | |
123 | * Do callout verification for an address * | |
124 | *************************************************/ | |
125 | ||
126 | /* This function is called from verify_address() when the address has routed to | |
127 | a host list, and a callout has been requested. Callouts are expensive; that is | |
128 | why a cache is used to improve the efficiency. | |
129 | ||
130 | Arguments: | |
131 | addr the address that's been routed | |
132 | host_list the list of hosts to try | |
133 | tf the transport feedback block | |
134 | ||
135 | ifstring "interface" option from transport, or NULL | |
136 | portstring "port" option from transport, or NULL | |
137 | protocolstring "protocol" option from transport, or NULL | |
138 | callout the per-command callout timeout | |
4deaf07d PH |
139 | callout_overall the overall callout timeout (if < 0 use 4*callout) |
140 | callout_connect the callout connection timeout (if < 0 use callout) | |
059ec3d9 PH |
141 | options the verification options - these bits are used: |
142 | vopt_is_recipient => this is a recipient address | |
143 | vopt_callout_no_cache => don't use callout cache | |
2a4be8f9 | 144 | vopt_callout_fullpm => if postmaster check, do full one |
059ec3d9 PH |
145 | vopt_callout_random => do the "random" thing |
146 | vopt_callout_recipsender => use real sender for recipient | |
147 | vopt_callout_recippmaster => use postmaster for recipient | |
148 | se_mailfrom MAIL FROM address for sender verify; NULL => "" | |
149 | pm_mailfrom if non-NULL, do the postmaster check with this sender | |
150 | ||
151 | Returns: OK/FAIL/DEFER | |
152 | */ | |
153 | ||
154 | static int | |
155 | do_callout(address_item *addr, host_item *host_list, transport_feedback *tf, | |
8e669ac1 | 156 | int callout, int callout_overall, int callout_connect, int options, |
4deaf07d | 157 | uschar *se_mailfrom, uschar *pm_mailfrom) |
059ec3d9 | 158 | { |
059ec3d9 | 159 | int yield = OK; |
2b1c6e3a | 160 | int old_domain_cache_result = ccache_accept; |
059ec3d9 PH |
161 | BOOL done = FALSE; |
162 | uschar *address_key; | |
163 | uschar *from_address; | |
164 | uschar *random_local_part = NULL; | |
55414b25 | 165 | const uschar *save_deliver_domain = deliver_domain; |
8b9476ba JH |
166 | uschar **failure_ptr = options & vopt_is_recipient |
167 | ? &recipient_verify_failure : &sender_verify_failure; | |
059ec3d9 PH |
168 | open_db dbblock; |
169 | open_db *dbm_file = NULL; | |
170 | dbdata_callout_cache new_domain_record; | |
171 | dbdata_callout_cache_address new_address_record; | |
172 | host_item *host; | |
173 | time_t callout_start_time; | |
174 | ||
175 | new_domain_record.result = ccache_unknown; | |
176 | new_domain_record.postmaster_result = ccache_unknown; | |
177 | new_domain_record.random_result = ccache_unknown; | |
178 | ||
179 | memset(&new_address_record, 0, sizeof(new_address_record)); | |
180 | ||
181 | /* For a recipient callout, the key used for the address cache record must | |
182 | include the sender address if we are using the real sender in the callout, | |
183 | because that may influence the result of the callout. */ | |
184 | ||
185 | address_key = addr->address; | |
186 | from_address = US""; | |
187 | ||
8b9476ba | 188 | if (options & vopt_is_recipient) |
059ec3d9 | 189 | { |
5032d1cf | 190 | if (options & vopt_callout_recipsender) |
059ec3d9 PH |
191 | { |
192 | address_key = string_sprintf("%s/<%s>", addr->address, sender_address); | |
193 | from_address = sender_address; | |
8b9476ba | 194 | if (cutthrough.delivery) options |= vopt_callout_no_cache; |
059ec3d9 | 195 | } |
5032d1cf | 196 | else if (options & vopt_callout_recippmaster) |
059ec3d9 PH |
197 | { |
198 | address_key = string_sprintf("%s/<postmaster@%s>", addr->address, | |
199 | qualify_domain_sender); | |
200 | from_address = string_sprintf("postmaster@%s", qualify_domain_sender); | |
201 | } | |
202 | } | |
203 | ||
204 | /* For a sender callout, we must adjust the key if the mailfrom address is not | |
205 | empty. */ | |
206 | ||
207 | else | |
208 | { | |
209 | from_address = (se_mailfrom == NULL)? US"" : se_mailfrom; | |
210 | if (from_address[0] != 0) | |
211 | address_key = string_sprintf("%s/<%s>", addr->address, from_address); | |
212 | } | |
213 | ||
214 | /* Open the callout cache database, it it exists, for reading only at this | |
215 | stage, unless caching has been disabled. */ | |
216 | ||
8b9476ba | 217 | if (options & vopt_callout_no_cache) |
059ec3d9 PH |
218 | { |
219 | HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n"); | |
220 | } | |
221 | else if ((dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE)) == NULL) | |
222 | { | |
223 | HDEBUG(D_verify) debug_printf("callout cache: not available\n"); | |
224 | } | |
225 | ||
226 | /* If a cache database is available see if we can avoid the need to do an | |
227 | actual callout by making use of previously-obtained data. */ | |
228 | ||
ff5929e3 | 229 | if (dbm_file) |
059ec3d9 PH |
230 | { |
231 | dbdata_callout_cache_address *cache_address_record; | |
232 | dbdata_callout_cache *cache_record = get_callout_cache_record(dbm_file, | |
233 | addr->domain, US"domain", | |
234 | callout_cache_domain_positive_expire, | |
235 | callout_cache_domain_negative_expire); | |
236 | ||
237 | /* If an unexpired cache record was found for this domain, see if the callout | |
238 | process can be short-circuited. */ | |
239 | ||
ff5929e3 | 240 | if (cache_record) |
059ec3d9 | 241 | { |
2b1c6e3a PH |
242 | /* In most cases, if an early command (up to and including MAIL FROM:<>) |
243 | was rejected, there is no point carrying on. The callout fails. However, if | |
244 | we are doing a recipient verification with use_sender or use_postmaster | |
245 | set, a previous failure of MAIL FROM:<> doesn't count, because this time we | |
246 | will be using a non-empty sender. We have to remember this situation so as | |
247 | not to disturb the cached domain value if this whole verification succeeds | |
248 | (we don't want it turning into "accept"). */ | |
249 | ||
250 | old_domain_cache_result = cache_record->result; | |
251 | ||
252 | if (cache_record->result == ccache_reject || | |
253 | (*from_address == 0 && cache_record->result == ccache_reject_mfnull)) | |
059ec3d9 PH |
254 | { |
255 | setflag(addr, af_verify_nsfail); | |
256 | HDEBUG(D_verify) | |
257 | debug_printf("callout cache: domain gave initial rejection, or " | |
258 | "does not accept HELO or MAIL FROM:<>\n"); | |
259 | setflag(addr, af_verify_nsfail); | |
260 | addr->user_message = US"(result of an earlier callout reused)."; | |
261 | yield = FAIL; | |
8e669ac1 | 262 | *failure_ptr = US"mail"; |
059ec3d9 PH |
263 | goto END_CALLOUT; |
264 | } | |
265 | ||
266 | /* If a previous check on a "random" local part was accepted, we assume | |
267 | that the server does not do any checking on local parts. There is therefore | |
268 | no point in doing the callout, because it will always be successful. If a | |
269 | random check previously failed, arrange not to do it again, but preserve | |
270 | the data in the new record. If a random check is required but hasn't been | |
271 | done, skip the remaining cache processing. */ | |
272 | ||
8b9476ba | 273 | if (options & vopt_callout_random) switch(cache_record->random_result) |
059ec3d9 PH |
274 | { |
275 | case ccache_accept: | |
8b9476ba JH |
276 | HDEBUG(D_verify) |
277 | debug_printf("callout cache: domain accepts random addresses\n"); | |
278 | goto END_CALLOUT; /* Default yield is OK */ | |
059ec3d9 PH |
279 | |
280 | case ccache_reject: | |
8b9476ba JH |
281 | HDEBUG(D_verify) |
282 | debug_printf("callout cache: domain rejects random addresses\n"); | |
283 | options &= ~vopt_callout_random; | |
284 | new_domain_record.random_result = ccache_reject; | |
285 | new_domain_record.random_stamp = cache_record->random_stamp; | |
286 | break; | |
059ec3d9 PH |
287 | |
288 | default: | |
8b9476ba JH |
289 | HDEBUG(D_verify) |
290 | debug_printf("callout cache: need to check random address handling " | |
291 | "(not cached or cache expired)\n"); | |
292 | goto END_CACHE; | |
059ec3d9 PH |
293 | } |
294 | ||
295 | /* If a postmaster check is requested, but there was a previous failure, | |
296 | there is again no point in carrying on. If a postmaster check is required, | |
297 | but has not been done before, we are going to have to do a callout, so skip | |
298 | remaining cache processing. */ | |
299 | ||
ff5929e3 | 300 | if (pm_mailfrom) |
059ec3d9 PH |
301 | { |
302 | if (cache_record->postmaster_result == ccache_reject) | |
303 | { | |
304 | setflag(addr, af_verify_pmfail); | |
305 | HDEBUG(D_verify) | |
306 | debug_printf("callout cache: domain does not accept " | |
307 | "RCPT TO:<postmaster@domain>\n"); | |
308 | yield = FAIL; | |
8e669ac1 | 309 | *failure_ptr = US"postmaster"; |
059ec3d9 PH |
310 | setflag(addr, af_verify_pmfail); |
311 | addr->user_message = US"(result of earlier verification reused)."; | |
312 | goto END_CALLOUT; | |
313 | } | |
314 | if (cache_record->postmaster_result == ccache_unknown) | |
315 | { | |
316 | HDEBUG(D_verify) | |
317 | debug_printf("callout cache: need to check RCPT " | |
318 | "TO:<postmaster@domain> (not cached or cache expired)\n"); | |
319 | goto END_CACHE; | |
320 | } | |
321 | ||
322 | /* If cache says OK, set pm_mailfrom NULL to prevent a redundant | |
323 | postmaster check if the address itself has to be checked. Also ensure | |
324 | that the value in the cache record is preserved (with its old timestamp). | |
325 | */ | |
326 | ||
327 | HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT " | |
328 | "TO:<postmaster@domain>\n"); | |
329 | pm_mailfrom = NULL; | |
330 | new_domain_record.postmaster_result = ccache_accept; | |
331 | new_domain_record.postmaster_stamp = cache_record->postmaster_stamp; | |
332 | } | |
333 | } | |
334 | ||
335 | /* We can't give a result based on information about the domain. See if there | |
336 | is an unexpired cache record for this specific address (combined with the | |
337 | sender address if we are doing a recipient callout with a non-empty sender). | |
338 | */ | |
339 | ||
340 | cache_address_record = (dbdata_callout_cache_address *) | |
341 | get_callout_cache_record(dbm_file, | |
342 | address_key, US"address", | |
343 | callout_cache_positive_expire, | |
344 | callout_cache_negative_expire); | |
345 | ||
ff5929e3 | 346 | if (cache_address_record) |
059ec3d9 PH |
347 | { |
348 | if (cache_address_record->result == ccache_accept) | |
349 | { | |
350 | HDEBUG(D_verify) | |
351 | debug_printf("callout cache: address record is positive\n"); | |
352 | } | |
353 | else | |
354 | { | |
355 | HDEBUG(D_verify) | |
356 | debug_printf("callout cache: address record is negative\n"); | |
357 | addr->user_message = US"Previous (cached) callout verification failure"; | |
8e669ac1 | 358 | *failure_ptr = US"recipient"; |
059ec3d9 PH |
359 | yield = FAIL; |
360 | } | |
361 | goto END_CALLOUT; | |
362 | } | |
363 | ||
364 | /* Close the cache database while we actually do the callout for real. */ | |
365 | ||
366 | END_CACHE: | |
367 | dbfn_close(dbm_file); | |
368 | dbm_file = NULL; | |
369 | } | |
370 | ||
193e3acd | 371 | if (!addr->transport) |
059ec3d9 | 372 | { |
193e3acd | 373 | HDEBUG(D_verify) debug_printf("cannot callout via null transport\n"); |
059ec3d9 | 374 | } |
6681531a HSHR |
375 | else if (Ustrcmp(addr->transport->driver_name, "smtp") != 0) |
376 | log_write(0, LOG_MAIN|LOG_PANIC|LOG_CONFIG_FOR, "callout transport '%s': %s is non-smtp", | |
377 | addr->transport->name, addr->transport->driver_name); | |
193e3acd JH |
378 | else |
379 | { | |
380 | smtp_transport_options_block *ob = | |
9d9c3746 | 381 | (smtp_transport_options_block *)addr->transport->options_block; |
059ec3d9 | 382 | |
193e3acd JH |
383 | /* The information wasn't available in the cache, so we have to do a real |
384 | callout and save the result in the cache for next time, unless no_cache is set, | |
385 | or unless we have a previously cached negative random result. If we are to test | |
386 | with a random local part, ensure that such a local part is available. If not, | |
4c04137d | 387 | log the fact, but carry on without randomising. */ |
059ec3d9 | 388 | |
8b9476ba | 389 | if (options & vopt_callout_random && callout_random_local_part != NULL) |
65f1c92a | 390 | if (!(random_local_part = expand_string(callout_random_local_part))) |
193e3acd JH |
391 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand " |
392 | "callout_random_local_part: %s", expand_string_message); | |
059ec3d9 | 393 | |
193e3acd JH |
394 | /* Default the connect and overall callout timeouts if not set, and record the |
395 | time we are starting so that we can enforce it. */ | |
4c590bd1 | 396 | |
193e3acd JH |
397 | if (callout_overall < 0) callout_overall = 4 * callout; |
398 | if (callout_connect < 0) callout_connect = callout; | |
399 | callout_start_time = time(NULL); | |
4c590bd1 | 400 | |
193e3acd JH |
401 | /* Before doing a real callout, if this is an SMTP connection, flush the SMTP |
402 | output because a callout might take some time. When PIPELINING is active and | |
403 | there are many recipients, the total time for doing lots of callouts can add up | |
404 | and cause the client to time out. So in this case we forgo the PIPELINING | |
405 | optimization. */ | |
817d9f57 | 406 | |
ff5929e3 | 407 | if (smtp_out && !disable_callout_flush) mac_smtp_fflush(); |
059ec3d9 | 408 | |
5032d1cf JH |
409 | /* cutthrough-multi: if a nonfirst rcpt has the same routing as the first, |
410 | and we are holding a cutthrough conn open, we can just append the rcpt to | |
411 | that conn for verification purposes (and later delivery also). Simplest | |
412 | coding means skipping this whole loop and doing the append separately. | |
413 | ||
414 | We will need to remember it has been appended so that rcpt-acl tail code | |
415 | can do it there for the non-rcpt-verify case. For this we keep an addresscount. | |
416 | */ | |
417 | ||
418 | /* Can we re-use an open cutthrough connection? */ | |
419 | if ( cutthrough.fd >= 0 | |
420 | && (options & (vopt_callout_recipsender | vopt_callout_recippmaster)) | |
421 | == vopt_callout_recipsender | |
422 | && !random_local_part | |
423 | && !pm_mailfrom | |
424 | ) | |
425 | { | |
426 | if (addr->transport == cutthrough.addr.transport) | |
427 | for (host = host_list; host; host = host->next) | |
428 | if (Ustrcmp(host->address, cutthrough.host.address) == 0) | |
429 | { | |
430 | int host_af; | |
431 | uschar *interface = NULL; /* Outgoing interface to use; NULL => any */ | |
432 | int port = 25; | |
433 | ||
434 | deliver_host = host->name; | |
435 | deliver_host_address = host->address; | |
436 | deliver_host_port = host->port; | |
437 | deliver_domain = addr->domain; | |
438 | transport_name = addr->transport->name; | |
439 | ||
440 | host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6; | |
441 | ||
6f6dedcc | 442 | if (!smtp_get_interface(tf->interface, host_af, addr, &interface, |
5032d1cf JH |
443 | US"callout") || |
444 | !smtp_get_port(tf->port, addr, &port, US"callout")) | |
445 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address, | |
446 | addr->message); | |
447 | ||
448 | if ( ( interface == cutthrough.interface | |
449 | || ( interface | |
450 | && cutthrough.interface | |
451 | && Ustrcmp(interface, cutthrough.interface) == 0 | |
452 | ) ) | |
453 | && port == cutthrough.host.port | |
454 | ) | |
455 | { | |
806c3df9 | 456 | uschar * resp = NULL; |
5032d1cf JH |
457 | |
458 | /* Match! Send the RCPT TO, append the addr, set done */ | |
459 | done = | |
460 | smtp_write_command(&ctblock, FALSE, "RCPT TO:<%.1000s>\r\n", | |
461 | transport_rcpt_address(addr, | |
462 | (addr->transport == NULL)? FALSE : | |
463 | addr->transport->rcpt_include_affixes)) >= 0 && | |
2760b518 | 464 | cutthrough_response('2', &resp, CUTTHROUGH_DATA_TIMEOUT) == '2'; |
5032d1cf JH |
465 | |
466 | /* This would go horribly wrong if a callout fail was ignored by ACL. | |
467 | We punt by abandoning cutthrough on a reject, like the | |
468 | first-rcpt does. */ | |
469 | ||
470 | if (done) | |
471 | { | |
472 | address_item * na = store_get(sizeof(address_item)); | |
473 | *na = cutthrough.addr; | |
474 | cutthrough.addr = *addr; | |
475 | cutthrough.addr.host_used = &cutthrough.host; | |
476 | cutthrough.addr.next = na; | |
477 | ||
478 | cutthrough.nrcpt++; | |
479 | } | |
480 | else | |
481 | { | |
482 | cancel_cutthrough_connection("recipient rejected"); | |
806c3df9 | 483 | if (!resp || errno == ETIMEDOUT) |
5032d1cf JH |
484 | { |
485 | HDEBUG(D_verify) debug_printf("SMTP timeout\n"); | |
486 | } | |
487 | else if (errno == 0) | |
488 | { | |
489 | if (*resp == 0) | |
490 | Ustrcpy(resp, US"connection dropped"); | |
491 | ||
492 | addr->message = | |
493 | string_sprintf("response to \"%s\" from %s [%s] was: %s", | |
494 | big_buffer, host->name, host->address, | |
495 | string_printing(resp)); | |
496 | ||
497 | addr->user_message = | |
498 | string_sprintf("Callout verification failed:\n%s", resp); | |
499 | ||
500 | /* Hard rejection ends the process */ | |
501 | ||
502 | if (resp[0] == '5') /* Address rejected */ | |
503 | { | |
504 | yield = FAIL; | |
505 | done = TRUE; | |
506 | } | |
507 | } | |
508 | } | |
509 | } | |
02b41d71 | 510 | break; /* host_list */ |
5032d1cf JH |
511 | } |
512 | if (!done) | |
513 | cancel_cutthrough_connection("incompatible connection"); | |
514 | } | |
515 | ||
193e3acd JH |
516 | /* Now make connections to the hosts and do real callouts. The list of hosts |
517 | is passed in as an argument. */ | |
059ec3d9 | 518 | |
ff5929e3 | 519 | for (host = host_list; host && !done; host = host->next) |
059ec3d9 | 520 | { |
193e3acd JH |
521 | int host_af; |
522 | int port = 25; | |
193e3acd | 523 | uschar *interface = NULL; /* Outgoing interface to use; NULL => any */ |
02b41d71 | 524 | smtp_context sx; |
193e3acd JH |
525 | uschar responsebuffer[4096]; |
526 | ||
527 | clearflag(addr, af_verify_pmfail); /* postmaster callout flag */ | |
528 | clearflag(addr, af_verify_nsfail); /* null sender callout flag */ | |
529 | ||
530 | /* Skip this host if we don't have an IP address for it. */ | |
531 | ||
ff5929e3 | 532 | if (!host->address) |
193e3acd JH |
533 | { |
534 | DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n", | |
535 | host->name); | |
536 | continue; | |
537 | } | |
059ec3d9 | 538 | |
193e3acd | 539 | /* Check the overall callout timeout */ |
059ec3d9 | 540 | |
193e3acd JH |
541 | if (time(NULL) - callout_start_time >= callout_overall) |
542 | { | |
543 | HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n"); | |
544 | break; | |
545 | } | |
059ec3d9 | 546 | |
193e3acd | 547 | /* Set IPv4 or IPv6 */ |
059ec3d9 | 548 | |
ff5929e3 | 549 | host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6; |
de3a88fb | 550 | |
193e3acd JH |
551 | /* Expand and interpret the interface and port strings. The latter will not |
552 | be used if there is a host-specific port (e.g. from a manualroute router). | |
553 | This has to be delayed till now, because they may expand differently for | |
554 | different hosts. If there's a failure, log it, but carry on with the | |
555 | defaults. */ | |
de3a88fb | 556 | |
193e3acd JH |
557 | deliver_host = host->name; |
558 | deliver_host_address = host->address; | |
a7538db1 | 559 | deliver_host_port = host->port; |
193e3acd | 560 | deliver_domain = addr->domain; |
aec45841 | 561 | transport_name = addr->transport->name; |
059ec3d9 | 562 | |
6f6dedcc | 563 | if ( !smtp_get_interface(tf->interface, host_af, addr, &interface, |
bf7aabb4 JH |
564 | US"callout") |
565 | || !smtp_get_port(tf->port, addr, &port, US"callout") | |
566 | ) | |
193e3acd JH |
567 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address, |
568 | addr->message); | |
059ec3d9 | 569 | |
02b41d71 JH |
570 | sx.addrlist = addr; |
571 | sx.host = host; | |
572 | sx.host_af = host_af, | |
573 | sx.port = port; | |
574 | sx.interface = interface; | |
575 | sx.helo_data = tf->helo_data; | |
576 | sx.tblock = addr->transport; | |
577 | ||
578 | tls_retry_connection: | |
579 | /* Set the address state so that errors are recorded in it */ | |
580 | ||
581 | addr->transport_return = PENDING_DEFER; | |
582 | ob->connect_timeout = callout_connect; | |
583 | ob->command_timeout = callout; | |
584 | ||
585 | /* Get the channel set up ready for a message (MAIL FROM being the next | |
586 | SMTP command to send. If we tried TLS but it failed, try again without | |
587 | if permitted */ | |
588 | ||
589 | if ( (yield = smtp_setup_conn(&sx, FALSE, TRUE)) == DEFER | |
590 | && addr->basic_errno == ERRNO_TLSFAILURE | |
591 | && ob->tls_tempfail_tryclear | |
592 | && verify_check_given_host(&ob->hosts_require_tls, host) != OK | |
593 | ) | |
193e3acd | 594 | { |
02b41d71 JH |
595 | log_write(0, LOG_MAIN, "TLS session failure:" |
596 | " callout unencrypted to %s [%s] (not in hosts_require_tls)", | |
597 | host->name, host->address); | |
598 | yield = smtp_setup_conn(&sx, TRUE, TRUE); | |
599 | } | |
600 | if (yield != OK) | |
601 | { | |
602 | if (addr->message) addr->message = string_sprintf("%s [%s] %s", | |
603 | host->name, host->address, addr->message); | |
604 | errno = addr->basic_errno; | |
aec45841 | 605 | transport_name = NULL; |
193e3acd JH |
606 | deliver_host = deliver_host_address = NULL; |
607 | deliver_domain = save_deliver_domain; | |
bf7aabb4 | 608 | |
02b41d71 JH |
609 | /* Failure to accept HELO is cached; this blocks the whole domain for all |
610 | senders. I/O errors and defer responses are not cached. */ | |
770747fd | 611 | |
02b41d71 | 612 | if (yield == FAIL && (errno == 0 || errno == ERRNO_SMTPCLOSED)) |
a7538db1 | 613 | { |
02b41d71 JH |
614 | setflag(addr, af_verify_nsfail); |
615 | new_domain_record.result = ccache_reject; | |
616 | done = TRUE; | |
a7538db1 | 617 | } |
193e3acd | 618 | else |
02b41d71 JH |
619 | done = FALSE; |
620 | goto no_conn; | |
3c8b3577 | 621 | } |
9bfc60eb | 622 | |
02b41d71 JH |
623 | /* If we needed to authenticate, smtp_setup_conn() did that. Copy |
624 | the AUTH info for logging */ | |
fcc8e047 | 625 | |
02b41d71 JH |
626 | addr->authenticator = client_authenticator; |
627 | addr->auth_id = client_authenticated_id; | |
b4a2b536 | 628 | |
fcc8e047 | 629 | /* Build a mail-AUTH string (re-using responsebuffer for convenience */ |
b4a2b536 | 630 | |
02b41d71 JH |
631 | done = |
632 | !smtp_mail_auth_str(responsebuffer, sizeof(responsebuffer), addr, ob) | |
633 | && ( | |
634 | (addr->auth_sndr = client_authenticated_sender), | |
fcc8e047 | 635 | |
193e3acd | 636 | /* Send the MAIL command */ |
02b41d71 JH |
637 | |
638 | (smtp_write_command(&sx.outblock, FALSE, | |
8c5d388a | 639 | #ifdef SUPPORT_I18N |
02b41d71 JH |
640 | addr->prop.utf8_msg && !addr->prop.utf8_downcvt |
641 | ? "MAIL FROM:<%s>%s%s SMTPUTF8\r\n" | |
642 | : | |
9bfc60eb | 643 | #endif |
02b41d71 JH |
644 | "MAIL FROM:<%s>%s%s\r\n", |
645 | from_address, | |
646 | responsebuffer, | |
647 | options & vopt_is_recipient && sx.peer_offered & PEER_OFFERED_SIZE | |
648 | ? string_sprintf(" SIZE=%d", message_size + ob->size_addition) | |
649 | : US"" | |
650 | ||
651 | ) >= 0) | |
652 | ) | |
2b1c6e3a | 653 | |
02b41d71 JH |
654 | && smtp_read_response(&sx.inblock, responsebuffer, sizeof(responsebuffer), |
655 | '2', callout); | |
059ec3d9 | 656 | |
00bff6f6 JH |
657 | deliver_host = deliver_host_address = NULL; |
658 | deliver_domain = save_deliver_domain; | |
659 | ||
193e3acd JH |
660 | /* If the host does not accept MAIL FROM:<>, arrange to cache this |
661 | information, but again, don't record anything for an I/O error or a defer. Do | |
662 | not cache rejections of MAIL when a non-empty sender has been used, because | |
663 | that blocks the whole domain for all senders. */ | |
059ec3d9 | 664 | |
193e3acd | 665 | if (!done) |
059ec3d9 | 666 | { |
193e3acd JH |
667 | *failure_ptr = US"mail"; /* At or before MAIL */ |
668 | if (errno == 0 && responsebuffer[0] == '5') | |
669 | { | |
670 | setflag(addr, af_verify_nsfail); | |
671 | if (from_address[0] == 0) | |
672 | new_domain_record.result = ccache_reject_mfnull; | |
673 | } | |
059ec3d9 | 674 | } |
059ec3d9 | 675 | |
193e3acd JH |
676 | /* Otherwise, proceed to check a "random" address (if required), then the |
677 | given address, and the postmaster address (if required). Between each check, | |
678 | issue RSET, because some servers accept only one recipient after MAIL | |
679 | FROM:<>. | |
2b1c6e3a | 680 | |
193e3acd JH |
681 | Before doing this, set the result in the domain cache record to "accept", |
682 | unless its previous value was ccache_reject_mfnull. In that case, the domain | |
683 | rejects MAIL FROM:<> and we want to continue to remember that. When that is | |
684 | the case, we have got here only in the case of a recipient verification with | |
685 | a non-null sender. */ | |
059ec3d9 | 686 | |
193e3acd | 687 | else |
059ec3d9 | 688 | { |
921dfc11 JH |
689 | const uschar * rcpt_domain = addr->domain; |
690 | ||
8c5d388a | 691 | #ifdef SUPPORT_I18N |
921dfc11 JH |
692 | uschar * errstr = NULL; |
693 | if ( testflag(addr, af_utf8_downcvt) | |
694 | && (rcpt_domain = string_domain_utf8_to_alabel(rcpt_domain, | |
695 | &errstr), errstr) | |
696 | ) | |
697 | { | |
698 | addr->message = errstr; | |
699 | errno = ERRNO_EXPANDFAIL; | |
700 | setflag(addr, af_verify_nsfail); | |
701 | done = FALSE; | |
702 | rcpt_domain = US""; /*XXX errorhandling! */ | |
703 | } | |
704 | #endif | |
705 | ||
193e3acd JH |
706 | new_domain_record.result = |
707 | (old_domain_cache_result == ccache_reject_mfnull)? | |
708 | ccache_reject_mfnull: ccache_accept; | |
059ec3d9 | 709 | |
193e3acd | 710 | /* Do the random local part check first */ |
059ec3d9 | 711 | |
193e3acd | 712 | if (random_local_part != NULL) |
059ec3d9 | 713 | { |
193e3acd JH |
714 | uschar randombuffer[1024]; |
715 | BOOL random_ok = | |
02b41d71 | 716 | smtp_write_command(&sx.outblock, FALSE, |
193e3acd | 717 | "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part, |
921dfc11 | 718 | rcpt_domain) >= 0 && |
02b41d71 | 719 | smtp_read_response(&sx.inblock, randombuffer, |
193e3acd | 720 | sizeof(randombuffer), '2', callout); |
059ec3d9 | 721 | |
193e3acd | 722 | /* Remember when we last did a random test */ |
059ec3d9 | 723 | |
193e3acd | 724 | new_domain_record.random_stamp = time(NULL); |
059ec3d9 | 725 | |
193e3acd | 726 | /* If accepted, we aren't going to do any further tests below. */ |
059ec3d9 | 727 | |
193e3acd | 728 | if (random_ok) |
193e3acd | 729 | new_domain_record.random_result = ccache_accept; |
059ec3d9 | 730 | |
193e3acd JH |
731 | /* Otherwise, cache a real negative response, and get back to the right |
732 | state to send RCPT. Unless there's some problem such as a dropped | |
65f1c92a JH |
733 | connection, we expect to succeed, because the commands succeeded above. |
734 | However, some servers drop the connection after responding to an | |
735 | invalid recipient, so on (any) error we drop and remake the connection. | |
736 | */ | |
059ec3d9 | 737 | |
193e3acd JH |
738 | else if (errno == 0) |
739 | { | |
65f1c92a JH |
740 | /* This would be ok for 1st rcpt a cutthrough, but no way to |
741 | handle a subsequent. So refuse to support any */ | |
5032d1cf JH |
742 | cancel_cutthrough_connection("random-recipient"); |
743 | ||
193e3acd JH |
744 | if (randombuffer[0] == '5') |
745 | new_domain_record.random_result = ccache_reject; | |
746 | ||
747 | done = | |
02b41d71 JH |
748 | smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0 && |
749 | smtp_read_response(&sx.inblock, responsebuffer, sizeof(responsebuffer), | |
193e3acd JH |
750 | '2', callout) && |
751 | ||
02b41d71 | 752 | smtp_write_command(&sx.outblock, FALSE, |
8c5d388a | 753 | #ifdef SUPPORT_I18N |
921dfc11 | 754 | addr->prop.utf8_msg && !addr->prop.utf8_downcvt |
9bfc60eb JH |
755 | ? "MAIL FROM:<%s> SMTPUTF8\r\n" |
756 | : | |
757 | #endif | |
758 | "MAIL FROM:<%s>\r\n", | |
193e3acd | 759 | from_address) >= 0 && |
02b41d71 | 760 | smtp_read_response(&sx.inblock, responsebuffer, sizeof(responsebuffer), |
193e3acd | 761 | '2', callout); |
65f1c92a JH |
762 | |
763 | if (!done) | |
764 | { | |
765 | HDEBUG(D_acl|D_v) | |
766 | debug_printf("problem after random/rset/mfrom; reopen conn\n"); | |
767 | random_local_part = NULL; | |
768 | #ifdef SUPPORT_TLS | |
769 | tls_close(FALSE, TRUE); | |
770 | #endif | |
ae5afa61 | 771 | HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n"); |
02b41d71 | 772 | (void)close(sx.inblock.sock); |
0cbf2b82 | 773 | #ifndef DISABLE_EVENT |
65f1c92a JH |
774 | (void) event_raise(addr->transport->event_action, |
775 | US"tcp:close", NULL); | |
776 | #endif | |
777 | goto tls_retry_connection; | |
778 | } | |
193e3acd JH |
779 | } |
780 | else done = FALSE; /* Some timeout/connection problem */ | |
781 | } /* Random check */ | |
059ec3d9 | 782 | |
193e3acd JH |
783 | /* If the host is accepting all local parts, as determined by the "random" |
784 | check, we don't need to waste time doing any further checking. */ | |
059ec3d9 | 785 | |
193e3acd | 786 | if (new_domain_record.random_result != ccache_accept && done) |
059ec3d9 | 787 | { |
193e3acd JH |
788 | /* Get the rcpt_include_affixes flag from the transport if there is one, |
789 | but assume FALSE if there is not. */ | |
e4bdf652 | 790 | |
921dfc11 JH |
791 | uschar * rcpt = transport_rcpt_address(addr, |
792 | addr->transport ? addr->transport->rcpt_include_affixes : FALSE); | |
793 | ||
8c5d388a | 794 | #ifdef SUPPORT_I18N |
921dfc11 | 795 | /*XXX should the conversion be moved into transport_rcpt_address() ? */ |
921dfc11 | 796 | if ( testflag(addr, af_utf8_downcvt) |
9427e879 JH |
797 | && !(rcpt = string_address_utf8_to_alabel(rcpt, NULL)) |
798 | ) | |
799 | { | |
800 | errno = ERRNO_EXPANDFAIL; | |
801 | *failure_ptr = US"recipient"; | |
802 | done = FALSE; | |
803 | } | |
921dfc11 JH |
804 | else |
805 | #endif | |
806 | ||
059ec3d9 | 807 | done = |
02b41d71 | 808 | smtp_write_command(&sx.outblock, FALSE, "RCPT TO:<%.1000s>\r\n", |
921dfc11 | 809 | rcpt) >= 0 && |
02b41d71 | 810 | smtp_read_response(&sx.inblock, responsebuffer, sizeof(responsebuffer), |
193e3acd | 811 | '2', callout); |
059ec3d9 | 812 | |
193e3acd JH |
813 | if (done) |
814 | new_address_record.result = ccache_accept; | |
815 | else if (errno == 0 && responsebuffer[0] == '5') | |
816 | { | |
817 | *failure_ptr = US"recipient"; | |
818 | new_address_record.result = ccache_reject; | |
819 | } | |
059ec3d9 | 820 | |
193e3acd JH |
821 | /* Do postmaster check if requested; if a full check is required, we |
822 | check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */ | |
2a4be8f9 | 823 | |
02b41d71 | 824 | if (done && pm_mailfrom) |
193e3acd | 825 | { |
65f1c92a JH |
826 | /* Could possibly shift before main verify, just above, and be ok |
827 | for cutthrough. But no way to handle a subsequent rcpt, so just | |
828 | refuse any */ | |
5032d1cf | 829 | cancel_cutthrough_connection("postmaster verify"); |
193e3acd JH |
830 | HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of postmaster verify\n"); |
831 | ||
832 | done = | |
02b41d71 JH |
833 | smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0 && |
834 | smtp_read_response(&sx.inblock, responsebuffer, | |
193e3acd JH |
835 | sizeof(responsebuffer), '2', callout) && |
836 | ||
02b41d71 | 837 | smtp_write_command(&sx.outblock, FALSE, |
193e3acd | 838 | "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 && |
02b41d71 | 839 | smtp_read_response(&sx.inblock, responsebuffer, |
193e3acd JH |
840 | sizeof(responsebuffer), '2', callout) && |
841 | ||
842 | /* First try using the current domain */ | |
843 | ||
844 | (( | |
02b41d71 | 845 | smtp_write_command(&sx.outblock, FALSE, |
921dfc11 | 846 | "RCPT TO:<postmaster@%.1000s>\r\n", rcpt_domain) >= 0 && |
02b41d71 | 847 | smtp_read_response(&sx.inblock, responsebuffer, |
193e3acd JH |
848 | sizeof(responsebuffer), '2', callout) |
849 | ) | |
850 | ||
851 | || | |
852 | ||
853 | /* If that doesn't work, and a full check is requested, | |
854 | try without the domain. */ | |
855 | ||
856 | ( | |
857 | (options & vopt_callout_fullpm) != 0 && | |
02b41d71 | 858 | smtp_write_command(&sx.outblock, FALSE, |
193e3acd | 859 | "RCPT TO:<postmaster>\r\n") >= 0 && |
02b41d71 | 860 | smtp_read_response(&sx.inblock, responsebuffer, |
193e3acd JH |
861 | sizeof(responsebuffer), '2', callout) |
862 | )); | |
863 | ||
864 | /* Sort out the cache record */ | |
865 | ||
866 | new_domain_record.postmaster_stamp = time(NULL); | |
867 | ||
868 | if (done) | |
869 | new_domain_record.postmaster_result = ccache_accept; | |
870 | else if (errno == 0 && responsebuffer[0] == '5') | |
871 | { | |
872 | *failure_ptr = US"postmaster"; | |
873 | setflag(addr, af_verify_pmfail); | |
874 | new_domain_record.postmaster_result = ccache_reject; | |
875 | } | |
876 | } | |
877 | } /* Random not accepted */ | |
878 | } /* MAIL FROM: accepted */ | |
2a4be8f9 | 879 | |
193e3acd JH |
880 | /* For any failure of the main check, other than a negative response, we just |
881 | close the connection and carry on. We can identify a negative response by the | |
882 | fact that errno is zero. For I/O errors it will be non-zero | |
2a4be8f9 | 883 | |
193e3acd JH |
884 | Set up different error texts for logging and for sending back to the caller |
885 | as an SMTP response. Log in all cases, using a one-line format. For sender | |
886 | callouts, give a full response to the caller, but for recipient callouts, | |
887 | don't give the IP address because this may be an internal host whose identity | |
888 | is not to be widely broadcast. */ | |
2a4be8f9 | 889 | |
02b41d71 JH |
890 | no_conn: |
891 | if (!done) switch(errno) | |
193e3acd | 892 | { |
02b41d71 JH |
893 | case ETIMEDOUT: |
894 | HDEBUG(D_verify) debug_printf("SMTP timeout\n"); | |
895 | sx.send_quit = FALSE; | |
896 | break; | |
897 | ||
8c5d388a | 898 | #ifdef SUPPORT_I18N |
02b41d71 | 899 | case ERRNO_UTF8_FWD: |
9bfc60eb JH |
900 | { |
901 | extern int acl_where; /* src/acl.c */ | |
902 | errno = 0; | |
903 | addr->message = string_sprintf( | |
02b41d71 JH |
904 | "response to \"EHLO\" from %s [%s] did not include SMTPUTF8", |
905 | host->name, host->address); | |
906 | addr->user_message = acl_where == ACL_WHERE_RCPT | |
907 | ? US"533 no support for internationalised mailbox name" | |
9bfc60eb JH |
908 | : US"550 mailbox unavailable"; |
909 | yield = FAIL; | |
910 | done = TRUE; | |
911 | } | |
02b41d71 | 912 | break; |
9bfc60eb | 913 | #endif |
02b41d71 JH |
914 | case ECONNREFUSED: |
915 | sx.send_quit = FALSE; | |
916 | break; | |
2a4be8f9 | 917 | |
02b41d71 JH |
918 | case 0: |
919 | if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped"); | |
059ec3d9 | 920 | |
02b41d71 JH |
921 | addr->message = |
922 | string_sprintf("response to \"%s\" from %s [%s] was: %s", | |
923 | big_buffer, host->name, host->address, | |
924 | string_printing(responsebuffer)); | |
925 | ||
926 | addr->user_message = options & vopt_is_recipient | |
8b9476ba | 927 | ? string_sprintf("Callout verification failed:\n%s", responsebuffer) |
02b41d71 JH |
928 | : string_sprintf("Called: %s\nSent: %s\nResponse: %s", |
929 | host->address, big_buffer, responsebuffer); | |
059ec3d9 | 930 | |
02b41d71 | 931 | /* Hard rejection ends the process */ |
193e3acd | 932 | |
02b41d71 JH |
933 | if (responsebuffer[0] == '5') /* Address rejected */ |
934 | { | |
935 | yield = FAIL; | |
936 | done = TRUE; | |
937 | } | |
938 | break; | |
193e3acd | 939 | } |
059ec3d9 | 940 | |
193e3acd JH |
941 | /* End the SMTP conversation and close the connection. */ |
942 | ||
4c04137d | 943 | /* Cutthrough - on a successful connect and recipient-verify with |
5032d1cf | 944 | use-sender and we are 1st rcpt and have no cutthrough conn so far |
193e3acd | 945 | here is where we want to leave the conn open */ |
5032d1cf JH |
946 | if ( cutthrough.delivery |
947 | && rcpt_count == 1 | |
193e3acd JH |
948 | && done |
949 | && yield == OK | |
98c82a3d JH |
950 | && (options & (vopt_callout_recipsender|vopt_callout_recippmaster|vopt_success_on_redirect)) |
951 | == vopt_callout_recipsender | |
193e3acd JH |
952 | && !random_local_part |
953 | && !pm_mailfrom | |
5032d1cf | 954 | && cutthrough.fd < 0 |
02b41d71 | 955 | && !sx.lmtp |
193e3acd | 956 | ) |
059ec3d9 | 957 | { |
8b9476ba JH |
958 | HDEBUG(D_acl|D_v) debug_printf("holding verify callout open for cutthrough delivery\n"); |
959 | ||
02b41d71 | 960 | cutthrough.fd = sx.outblock.sock; /* We assume no buffer in use in the outblock */ |
5032d1cf JH |
961 | cutthrough.nrcpt = 1; |
962 | cutthrough.interface = interface; | |
963 | cutthrough.host = *host; | |
964 | cutthrough.addr = *addr; /* Save the address_item for later logging */ | |
965 | cutthrough.addr.next = NULL; | |
966 | cutthrough.addr.host_used = &cutthrough.host; | |
193e3acd | 967 | if (addr->parent) |
5032d1cf JH |
968 | *(cutthrough.addr.parent = store_get(sizeof(address_item))) = |
969 | *addr->parent; | |
193e3acd JH |
970 | ctblock.buffer = ctbuffer; |
971 | ctblock.buffersize = sizeof(ctbuffer); | |
972 | ctblock.ptr = ctbuffer; | |
973 | /* ctblock.cmd_count = 0; ctblock.authenticating = FALSE; */ | |
5032d1cf | 974 | ctblock.sock = cutthrough.fd; |
059ec3d9 | 975 | } |
193e3acd | 976 | else |
059ec3d9 | 977 | { |
2e5b33cd | 978 | /* Ensure no cutthrough on multiple address verifies */ |
193e3acd | 979 | if (options & vopt_callout_recipsender) |
ff5929e3 | 980 | cancel_cutthrough_connection("not usable for cutthrough"); |
02b41d71 | 981 | if (sx.send_quit) |
2760b518 | 982 | { |
02b41d71 | 983 | (void) smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n"); |
059ec3d9 | 984 | |
2760b518 | 985 | /* Wait a short time for response, and discard it */ |
02b41d71 | 986 | smtp_read_response(&sx.inblock, responsebuffer, sizeof(responsebuffer), |
2760b518 JH |
987 | '2', 1); |
988 | } | |
989 | ||
02b41d71 JH |
990 | if (sx.inblock.sock >= 0) |
991 | { | |
a7538db1 | 992 | #ifdef SUPPORT_TLS |
02b41d71 | 993 | tls_close(FALSE, TRUE); |
a7538db1 | 994 | #endif |
02b41d71 JH |
995 | HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n"); |
996 | (void)close(sx.inblock.sock); | |
997 | sx.inblock.sock = sx.outblock.sock = -1; | |
0cbf2b82 | 998 | #ifndef DISABLE_EVENT |
02b41d71 | 999 | (void) event_raise(addr->transport->event_action, US"tcp:close", NULL); |
a7538db1 | 1000 | #endif |
02b41d71 | 1001 | } |
059ec3d9 | 1002 | } |
059ec3d9 | 1003 | |
193e3acd JH |
1004 | } /* Loop through all hosts, while !done */ |
1005 | } | |
059ec3d9 PH |
1006 | |
1007 | /* If we get here with done == TRUE, a successful callout happened, and yield | |
1008 | will be set OK or FAIL according to the response to the RCPT command. | |
1009 | Otherwise, we looped through the hosts but couldn't complete the business. | |
1010 | However, there may be domain-specific information to cache in both cases. | |
1011 | ||
1012 | The value of the result field in the new_domain record is ccache_unknown if | |
90e9ce59 | 1013 | there was an error before or with MAIL FROM:, and errno was not zero, |
059ec3d9 | 1014 | implying some kind of I/O error. We don't want to write the cache in that case. |
2b1c6e3a | 1015 | Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */ |
059ec3d9 | 1016 | |
8b9476ba JH |
1017 | if ( !(options & vopt_callout_no_cache) |
1018 | && new_domain_record.result != ccache_unknown) | |
059ec3d9 PH |
1019 | { |
1020 | if ((dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE)) | |
1021 | == NULL) | |
1022 | { | |
1023 | HDEBUG(D_verify) debug_printf("callout cache: not available\n"); | |
1024 | } | |
1025 | else | |
1026 | { | |
1027 | (void)dbfn_write(dbm_file, addr->domain, &new_domain_record, | |
1028 | (int)sizeof(dbdata_callout_cache)); | |
8b9476ba | 1029 | HDEBUG(D_verify) debug_printf("wrote callout cache domain record for %s:\n" |
059ec3d9 | 1030 | " result=%d postmaster=%d random=%d\n", |
8b9476ba | 1031 | addr->domain, |
059ec3d9 PH |
1032 | new_domain_record.result, |
1033 | new_domain_record.postmaster_result, | |
1034 | new_domain_record.random_result); | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | /* If a definite result was obtained for the callout, cache it unless caching | |
1039 | is disabled. */ | |
1040 | ||
1041 | if (done) | |
1042 | { | |
8b9476ba JH |
1043 | if ( !(options & vopt_callout_no_cache) |
1044 | && new_address_record.result != ccache_unknown) | |
059ec3d9 | 1045 | { |
ff5929e3 | 1046 | if (!dbm_file) |
059ec3d9 | 1047 | dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE); |
ff5929e3 | 1048 | if (!dbm_file) |
059ec3d9 PH |
1049 | { |
1050 | HDEBUG(D_verify) debug_printf("no callout cache available\n"); | |
1051 | } | |
1052 | else | |
1053 | { | |
1054 | (void)dbfn_write(dbm_file, address_key, &new_address_record, | |
1055 | (int)sizeof(dbdata_callout_cache_address)); | |
8b9476ba JH |
1056 | HDEBUG(D_verify) debug_printf("wrote %s callout cache address record for %s\n", |
1057 | new_address_record.result == ccache_accept ? "positive" : "negative", | |
1058 | address_key); | |
059ec3d9 PH |
1059 | } |
1060 | } | |
1061 | } /* done */ | |
1062 | ||
1063 | /* Failure to connect to any host, or any response other than 2xx or 5xx is a | |
1064 | temporary error. If there was only one host, and a response was received, leave | |
1065 | it alone if supplying details. Otherwise, give a generic response. */ | |
1066 | ||
1067 | else /* !done */ | |
1068 | { | |
ff5929e3 | 1069 | uschar * dullmsg = string_sprintf("Could not complete %s verify callout", |
8b9476ba | 1070 | options & vopt_is_recipient ? "recipient" : "sender"); |
059ec3d9 PH |
1071 | yield = DEFER; |
1072 | ||
02b41d71 JH |
1073 | addr->message = host_list->next || !addr->message |
1074 | ? dullmsg : string_sprintf("%s: %s", dullmsg, addr->message); | |
059ec3d9 | 1075 | |
ff5929e3 JH |
1076 | addr->user_message = smtp_return_error_details |
1077 | ? string_sprintf("%s for <%s>.\n" | |
059ec3d9 PH |
1078 | "The mail server(s) for the domain may be temporarily unreachable, or\n" |
1079 | "they may be permanently unreachable from this server. In the latter case,\n%s", | |
1080 | dullmsg, addr->address, | |
8b9476ba | 1081 | options & vopt_is_recipient |
ff5929e3 | 1082 | ? "the address will never be accepted." |
8b9476ba JH |
1083 | : "you need to change the address or create an MX record for its domain\n" |
1084 | "if it is supposed to be generally accessible from the Internet.\n" | |
ff5929e3 JH |
1085 | "Talk to your mail administrator for details.") |
1086 | : dullmsg; | |
059ec3d9 PH |
1087 | |
1088 | /* Force a specific error code */ | |
1089 | ||
1090 | addr->basic_errno = ERRNO_CALLOUTDEFER; | |
1091 | } | |
1092 | ||
1093 | /* Come here from within the cache-reading code on fast-track exit. */ | |
1094 | ||
1095 | END_CALLOUT: | |
ff5929e3 | 1096 | if (dbm_file) dbfn_close(dbm_file); |
02b41d71 | 1097 | tls_modify_variables(&tls_in); |
059ec3d9 PH |
1098 | return yield; |
1099 | } | |
1100 | ||
1101 | ||
1102 | ||
817d9f57 JH |
1103 | /* Called after recipient-acl to get a cutthrough connection open when |
1104 | one was requested and a recipient-verify wasn't subsequently done. | |
1105 | */ | |
f9334a28 | 1106 | int |
e4bdf652 JH |
1107 | open_cutthrough_connection( address_item * addr ) |
1108 | { | |
1109 | address_item addr2; | |
f9334a28 | 1110 | int rc; |
e4bdf652 JH |
1111 | |
1112 | /* Use a recipient-verify-callout to set up the cutthrough connection. */ | |
1113 | /* We must use a copy of the address for verification, because it might | |
1114 | get rewritten. */ | |
1115 | ||
1116 | addr2 = *addr; | |
5032d1cf JH |
1117 | HDEBUG(D_acl) debug_printf("----------- %s cutthrough setup ------------\n", |
1118 | rcpt_count > 1 ? "more" : "start"); | |
ff5929e3 | 1119 | rc = verify_address(&addr2, NULL, |
e4bdf652 JH |
1120 | vopt_is_recipient | vopt_callout_recipsender | vopt_callout_no_cache, |
1121 | CUTTHROUGH_CMD_TIMEOUT, -1, -1, | |
1122 | NULL, NULL, NULL); | |
ff5929e3 JH |
1123 | addr->message = addr2.message; |
1124 | addr->user_message = addr2.user_message; | |
e4bdf652 | 1125 | HDEBUG(D_acl) debug_printf("----------- end cutthrough setup ------------\n"); |
f9334a28 | 1126 | return rc; |
e4bdf652 JH |
1127 | } |
1128 | ||
1129 | ||
e4bdf652 | 1130 | |
817d9f57 JH |
1131 | /* Send given number of bytes from the buffer */ |
1132 | static BOOL | |
1133 | cutthrough_send(int n) | |
e4bdf652 | 1134 | { |
5032d1cf | 1135 | if(cutthrough.fd < 0) |
817d9f57 | 1136 | return TRUE; |
e4bdf652 | 1137 | |
817d9f57 JH |
1138 | if( |
1139 | #ifdef SUPPORT_TLS | |
5032d1cf | 1140 | (tls_out.active == cutthrough.fd) ? tls_write(FALSE, ctblock.buffer, n) : |
817d9f57 | 1141 | #endif |
5032d1cf | 1142 | send(cutthrough.fd, ctblock.buffer, n, 0) > 0 |
817d9f57 JH |
1143 | ) |
1144 | { | |
1145 | transport_count += n; | |
1146 | ctblock.ptr= ctblock.buffer; | |
1147 | return TRUE; | |
1148 | } | |
e4bdf652 | 1149 | |
817d9f57 JH |
1150 | HDEBUG(D_transport|D_acl) debug_printf("cutthrough_send failed: %s\n", strerror(errno)); |
1151 | return FALSE; | |
e4bdf652 JH |
1152 | } |
1153 | ||
1154 | ||
1155 | ||
817d9f57 JH |
1156 | static BOOL |
1157 | _cutthrough_puts(uschar * cp, int n) | |
1158 | { | |
1159 | while(n--) | |
1160 | { | |
1161 | if(ctblock.ptr >= ctblock.buffer+ctblock.buffersize) | |
1162 | if(!cutthrough_send(ctblock.buffersize)) | |
1163 | return FALSE; | |
1164 | ||
1165 | *ctblock.ptr++ = *cp++; | |
1166 | } | |
1167 | return TRUE; | |
1168 | } | |
1169 | ||
1170 | /* Buffered output of counted data block. Return boolean success */ | |
e4bdf652 JH |
1171 | BOOL |
1172 | cutthrough_puts(uschar * cp, int n) | |
1173 | { | |
5032d1cf | 1174 | if (cutthrough.fd < 0) return TRUE; |
817d9f57 | 1175 | if (_cutthrough_puts(cp, n)) return TRUE; |
2e5b33cd | 1176 | cancel_cutthrough_connection("transmit failed"); |
817d9f57 JH |
1177 | return FALSE; |
1178 | } | |
e4bdf652 | 1179 | |
e4bdf652 | 1180 | |
817d9f57 | 1181 | static BOOL |
5032d1cf | 1182 | _cutthrough_flush_send(void) |
817d9f57 JH |
1183 | { |
1184 | int n= ctblock.ptr-ctblock.buffer; | |
e4bdf652 | 1185 | |
817d9f57 JH |
1186 | if(n>0) |
1187 | if(!cutthrough_send(n)) | |
1188 | return FALSE; | |
1189 | return TRUE; | |
e4bdf652 JH |
1190 | } |
1191 | ||
817d9f57 JH |
1192 | |
1193 | /* Send out any bufferred output. Return boolean success. */ | |
e4bdf652 | 1194 | BOOL |
5032d1cf | 1195 | cutthrough_flush_send(void) |
e4bdf652 | 1196 | { |
817d9f57 | 1197 | if (_cutthrough_flush_send()) return TRUE; |
2e5b33cd | 1198 | cancel_cutthrough_connection("transmit failed"); |
e4bdf652 JH |
1199 | return FALSE; |
1200 | } | |
1201 | ||
1202 | ||
1203 | BOOL | |
5032d1cf | 1204 | cutthrough_put_nl(void) |
e4bdf652 JH |
1205 | { |
1206 | return cutthrough_puts(US"\r\n", 2); | |
1207 | } | |
1208 | ||
1209 | ||
1210 | /* Get and check response from cutthrough target */ | |
1211 | static uschar | |
2760b518 | 1212 | cutthrough_response(char expect, uschar ** copy, int timeout) |
e4bdf652 JH |
1213 | { |
1214 | smtp_inblock inblock; | |
1215 | uschar inbuffer[4096]; | |
1216 | uschar responsebuffer[4096]; | |
1217 | ||
1218 | inblock.buffer = inbuffer; | |
1219 | inblock.buffersize = sizeof(inbuffer); | |
1220 | inblock.ptr = inbuffer; | |
1221 | inblock.ptrend = inbuffer; | |
5032d1cf | 1222 | inblock.sock = cutthrough.fd; |
817d9f57 | 1223 | /* this relies on (inblock.sock == tls_out.active) */ |
2760b518 | 1224 | if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, timeout)) |
2e5b33cd | 1225 | cancel_cutthrough_connection("target timeout on read"); |
e4bdf652 JH |
1226 | |
1227 | if(copy != NULL) | |
1228 | { | |
1229 | uschar * cp; | |
5032d1cf | 1230 | *copy = cp = string_copy(responsebuffer); |
e4bdf652 JH |
1231 | /* Trim the trailing end of line */ |
1232 | cp += Ustrlen(responsebuffer); | |
1233 | if(cp > *copy && cp[-1] == '\n') *--cp = '\0'; | |
1234 | if(cp > *copy && cp[-1] == '\r') *--cp = '\0'; | |
1235 | } | |
1236 | ||
1237 | return responsebuffer[0]; | |
1238 | } | |
1239 | ||
1240 | ||
1241 | /* Negotiate dataphase with the cutthrough target, returning success boolean */ | |
1242 | BOOL | |
5032d1cf | 1243 | cutthrough_predata(void) |
e4bdf652 | 1244 | { |
5032d1cf | 1245 | if(cutthrough.fd < 0) |
e4bdf652 JH |
1246 | return FALSE; |
1247 | ||
1248 | HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> DATA\n"); | |
817d9f57 JH |
1249 | cutthrough_puts(US"DATA\r\n", 6); |
1250 | cutthrough_flush_send(); | |
e4bdf652 JH |
1251 | |
1252 | /* Assume nothing buffered. If it was it gets ignored. */ | |
2760b518 | 1253 | return cutthrough_response('3', NULL, CUTTHROUGH_DATA_TIMEOUT) == '3'; |
e4bdf652 JH |
1254 | } |
1255 | ||
1256 | ||
6d5c916c | 1257 | /* fd and tctx args only to match write_chunk() */ |
511a6c14 | 1258 | static BOOL |
6d5c916c | 1259 | cutthrough_write_chunk(int fd, transport_ctx * tctx, uschar * s, int len) |
511a6c14 JH |
1260 | { |
1261 | uschar * s2; | |
1262 | while(s && (s2 = Ustrchr(s, '\n'))) | |
1263 | { | |
1264 | if(!cutthrough_puts(s, s2-s) || !cutthrough_put_nl()) | |
1265 | return FALSE; | |
1266 | s = s2+1; | |
1267 | } | |
1268 | return TRUE; | |
1269 | } | |
1270 | ||
1271 | ||
e4bdf652 | 1272 | /* Buffered send of headers. Return success boolean. */ |
817d9f57 | 1273 | /* Expands newlines to wire format (CR,NL). */ |
e4bdf652 | 1274 | /* Also sends header-terminating blank line. */ |
e4bdf652 | 1275 | BOOL |
5032d1cf | 1276 | cutthrough_headers_send(void) |
e4bdf652 | 1277 | { |
6d5c916c JH |
1278 | transport_ctx tctx; |
1279 | ||
5032d1cf | 1280 | if(cutthrough.fd < 0) |
e4bdf652 JH |
1281 | return FALSE; |
1282 | ||
511a6c14 JH |
1283 | /* We share a routine with the mainline transport to handle header add/remove/rewrites, |
1284 | but having a separate buffered-output function (for now) | |
1285 | */ | |
1286 | HDEBUG(D_acl) debug_printf("----------- start cutthrough headers send -----------\n"); | |
e4bdf652 | 1287 | |
6d5c916c JH |
1288 | tctx.tblock = cutthrough.addr.transport; |
1289 | tctx.addr = &cutthrough.addr; | |
1290 | tctx.check_string = US"."; | |
1291 | tctx.escape_string = US".."; | |
1292 | tctx.options = topt_use_crlf; | |
1293 | ||
1294 | if (!transport_headers_send(cutthrough.fd, &tctx, &cutthrough_write_chunk)) | |
511a6c14 JH |
1295 | return FALSE; |
1296 | ||
1297 | HDEBUG(D_acl) debug_printf("----------- done cutthrough headers send ------------\n"); | |
1298 | return TRUE; | |
817d9f57 JH |
1299 | } |
1300 | ||
1301 | ||
1302 | static void | |
5032d1cf | 1303 | close_cutthrough_connection(const char * why) |
817d9f57 | 1304 | { |
5032d1cf | 1305 | if(cutthrough.fd >= 0) |
817d9f57 JH |
1306 | { |
1307 | /* We could be sending this after a bunch of data, but that is ok as | |
1308 | the only way to cancel the transfer in dataphase is to drop the tcp | |
1309 | conn before the final dot. | |
1310 | */ | |
1311 | ctblock.ptr = ctbuffer; | |
1312 | HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> QUIT\n"); | |
1313 | _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */ | |
1314 | _cutthrough_flush_send(); | |
2760b518 JH |
1315 | |
1316 | /* Wait a short time for response, and discard it */ | |
1317 | cutthrough_response('2', NULL, 1); | |
817d9f57 JH |
1318 | |
1319 | #ifdef SUPPORT_TLS | |
1320 | tls_close(FALSE, TRUE); | |
1321 | #endif | |
ae5afa61 | 1322 | HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n"); |
5032d1cf JH |
1323 | (void)close(cutthrough.fd); |
1324 | cutthrough.fd = -1; | |
2e5b33cd | 1325 | HDEBUG(D_acl) debug_printf("----------- cutthrough shutdown (%s) ------------\n", why); |
817d9f57 JH |
1326 | } |
1327 | ctblock.ptr = ctbuffer; | |
e4bdf652 JH |
1328 | } |
1329 | ||
817d9f57 | 1330 | void |
5032d1cf | 1331 | cancel_cutthrough_connection(const char * why) |
817d9f57 | 1332 | { |
2e5b33cd | 1333 | close_cutthrough_connection(why); |
5032d1cf | 1334 | cutthrough.delivery = FALSE; |
817d9f57 JH |
1335 | } |
1336 | ||
1337 | ||
1338 | ||
e4bdf652 JH |
1339 | |
1340 | /* Have senders final-dot. Send one to cutthrough target, and grab the response. | |
1341 | Log an OK response as a transmission. | |
817d9f57 | 1342 | Close the connection. |
e4bdf652 | 1343 | Return smtp response-class digit. |
e4bdf652 JH |
1344 | */ |
1345 | uschar * | |
5032d1cf | 1346 | cutthrough_finaldot(void) |
e4bdf652 | 1347 | { |
5032d1cf JH |
1348 | uschar res; |
1349 | address_item * addr; | |
e4bdf652 JH |
1350 | HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> .\n"); |
1351 | ||
1352 | /* Assume data finshed with new-line */ | |
5032d1cf JH |
1353 | if( !cutthrough_puts(US".", 1) |
1354 | || !cutthrough_put_nl() | |
1355 | || !cutthrough_flush_send() | |
1356 | ) | |
1357 | return cutthrough.addr.message; | |
e4bdf652 | 1358 | |
2760b518 | 1359 | res = cutthrough_response('2', &cutthrough.addr.message, CUTTHROUGH_DATA_TIMEOUT); |
5032d1cf | 1360 | for (addr = &cutthrough.addr; addr; addr = addr->next) |
817d9f57 | 1361 | { |
5032d1cf JH |
1362 | addr->message = cutthrough.addr.message; |
1363 | switch(res) | |
1364 | { | |
1365 | case '2': | |
1366 | delivery_log(LOG_MAIN, addr, (int)'>', NULL); | |
1367 | close_cutthrough_connection("delivered"); | |
1368 | break; | |
817d9f57 | 1369 | |
5032d1cf JH |
1370 | case '4': |
1371 | delivery_log(LOG_MAIN, addr, 0, | |
1372 | US"tmp-reject from cutthrough after DATA:"); | |
1373 | break; | |
e4bdf652 | 1374 | |
5032d1cf JH |
1375 | case '5': |
1376 | delivery_log(LOG_MAIN|LOG_REJECT, addr, 0, | |
1377 | US"rejected after DATA:"); | |
1378 | break; | |
e4bdf652 | 1379 | |
5032d1cf JH |
1380 | default: |
1381 | break; | |
1382 | } | |
817d9f57 | 1383 | } |
5032d1cf | 1384 | return cutthrough.addr.message; |
e4bdf652 JH |
1385 | } |
1386 | ||
1387 | ||
817d9f57 | 1388 | |
059ec3d9 PH |
1389 | /************************************************* |
1390 | * Copy error to toplevel address * | |
1391 | *************************************************/ | |
1392 | ||
1393 | /* This function is used when a verify fails or defers, to ensure that the | |
1394 | failure or defer information is in the original toplevel address. This applies | |
1395 | when an address is redirected to a single new address, and the failure or | |
1396 | deferral happens to the child address. | |
1397 | ||
1398 | Arguments: | |
1399 | vaddr the verify address item | |
1400 | addr the final address item | |
1401 | yield FAIL or DEFER | |
1402 | ||
1403 | Returns: the value of YIELD | |
1404 | */ | |
1405 | ||
1406 | static int | |
1407 | copy_error(address_item *vaddr, address_item *addr, int yield) | |
1408 | { | |
1409 | if (addr != vaddr) | |
1410 | { | |
1411 | vaddr->message = addr->message; | |
1412 | vaddr->user_message = addr->user_message; | |
1413 | vaddr->basic_errno = addr->basic_errno; | |
1414 | vaddr->more_errno = addr->more_errno; | |
d43cbe25 | 1415 | vaddr->prop.address_data = addr->prop.address_data; |
42855d71 | 1416 | copyflag(vaddr, addr, af_pass_message); |
059ec3d9 PH |
1417 | } |
1418 | return yield; | |
1419 | } | |
1420 | ||
1421 | ||
1422 | ||
1423 | ||
ce552449 NM |
1424 | /************************************************** |
1425 | * printf that automatically handles TLS if needed * | |
1426 | ***************************************************/ | |
1427 | ||
1428 | /* This function is used by verify_address() as a substitute for all fprintf() | |
1429 | calls; a direct fprintf() will not produce output in a TLS SMTP session, such | |
1430 | as a response to an EXPN command. smtp_in.c makes smtp_printf available but | |
1431 | that assumes that we always use the smtp_out FILE* when not using TLS or the | |
1432 | ssl buffer when we are. Instead we take a FILE* parameter and check to see if | |
1433 | that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular | |
1434 | fprintf(). | |
1435 | ||
1436 | Arguments: | |
1437 | f the candidate FILE* to write to | |
1438 | format format string | |
1439 | ... optional arguments | |
1440 | ||
1441 | Returns: | |
1442 | nothing | |
1443 | */ | |
1444 | ||
1445 | static void PRINTF_FUNCTION(2,3) | |
1ba28e2b | 1446 | respond_printf(FILE *f, const char *format, ...) |
ce552449 NM |
1447 | { |
1448 | va_list ap; | |
1449 | ||
1450 | va_start(ap, format); | |
1451 | if (smtp_out && (f == smtp_out)) | |
1452 | smtp_vprintf(format, ap); | |
1453 | else | |
513afc6a | 1454 | vfprintf(f, format, ap); |
ce552449 NM |
1455 | va_end(ap); |
1456 | } | |
1457 | ||
1458 | ||
1459 | ||
059ec3d9 PH |
1460 | /************************************************* |
1461 | * Verify an email address * | |
1462 | *************************************************/ | |
1463 | ||
1464 | /* This function is used both for verification (-bv and at other times) and | |
1465 | address testing (-bt), which is indicated by address_test_mode being set. | |
1466 | ||
1467 | Arguments: | |
1468 | vaddr contains the address to verify; the next field in this block | |
1469 | must be NULL | |
1470 | f if not NULL, write the result to this file | |
1471 | options various option bits: | |
1472 | vopt_fake_sender => this sender verify is not for the real | |
1473 | sender (it was verify=sender=xxxx or an address from a | |
1474 | header line) - rewriting must not change sender_address | |
1475 | vopt_is_recipient => this is a recipient address, otherwise | |
1476 | it's a sender address - this affects qualification and | |
1477 | rewriting and messages from callouts | |
1478 | vopt_qualify => qualify an unqualified address; else error | |
1479 | vopt_expn => called from SMTP EXPN command | |
eafd343b TK |
1480 | vopt_success_on_redirect => when a new address is generated |
1481 | the verification instantly succeeds | |
059ec3d9 PH |
1482 | |
1483 | These ones are used by do_callout() -- the options variable | |
1484 | is passed to it. | |
1485 | ||
2a4be8f9 | 1486 | vopt_callout_fullpm => if postmaster check, do full one |
059ec3d9 PH |
1487 | vopt_callout_no_cache => don't use callout cache |
1488 | vopt_callout_random => do the "random" thing | |
1489 | vopt_callout_recipsender => use real sender for recipient | |
1490 | vopt_callout_recippmaster => use postmaster for recipient | |
1491 | ||
1492 | callout if > 0, specifies that callout is required, and gives timeout | |
4deaf07d | 1493 | for individual commands |
059ec3d9 PH |
1494 | callout_overall if > 0, gives overall timeout for the callout function; |
1495 | if < 0, a default is used (see do_callout()) | |
8e669ac1 | 1496 | callout_connect the connection timeout for callouts |
059ec3d9 PH |
1497 | se_mailfrom when callout is requested to verify a sender, use this |
1498 | in MAIL FROM; NULL => "" | |
1499 | pm_mailfrom when callout is requested, if non-NULL, do the postmaster | |
1500 | thing and use this as the sender address (may be "") | |
1501 | ||
1502 | routed if not NULL, set TRUE if routing succeeded, so we can | |
1503 | distinguish between routing failed and callout failed | |
1504 | ||
1505 | Returns: OK address verified | |
1506 | FAIL address failed to verify | |
1507 | DEFER can't tell at present | |
1508 | */ | |
1509 | ||
1510 | int | |
1511 | verify_address(address_item *vaddr, FILE *f, int options, int callout, | |
8e669ac1 | 1512 | int callout_overall, int callout_connect, uschar *se_mailfrom, |
4deaf07d | 1513 | uschar *pm_mailfrom, BOOL *routed) |
059ec3d9 PH |
1514 | { |
1515 | BOOL allok = TRUE; | |
1516 | BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0); | |
059ec3d9 | 1517 | BOOL expn = (options & vopt_expn) != 0; |
eafd343b | 1518 | BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0; |
059ec3d9 PH |
1519 | int i; |
1520 | int yield = OK; | |
1521 | int verify_type = expn? v_expn : | |
1522 | address_test_mode? v_none : | |
8b9476ba | 1523 | options & vopt_is_recipient? v_recipient : v_sender; |
059ec3d9 PH |
1524 | address_item *addr_list; |
1525 | address_item *addr_new = NULL; | |
1526 | address_item *addr_remote = NULL; | |
1527 | address_item *addr_local = NULL; | |
1528 | address_item *addr_succeed = NULL; | |
8b9476ba JH |
1529 | uschar **failure_ptr = options & vopt_is_recipient |
1530 | ? &recipient_verify_failure : &sender_verify_failure; | |
059ec3d9 PH |
1531 | uschar *ko_prefix, *cr; |
1532 | uschar *address = vaddr->address; | |
1533 | uschar *save_sender; | |
1534 | uschar null_sender[] = { 0 }; /* Ensure writeable memory */ | |
1535 | ||
2c7db3f5 PH |
1536 | /* Clear, just in case */ |
1537 | ||
1538 | *failure_ptr = NULL; | |
1539 | ||
059ec3d9 PH |
1540 | /* Set up a prefix and suffix for error message which allow us to use the same |
1541 | output statements both in EXPN mode (where an SMTP response is needed) and when | |
1542 | debugging with an output file. */ | |
1543 | ||
1544 | if (expn) | |
1545 | { | |
1546 | ko_prefix = US"553 "; | |
1547 | cr = US"\r"; | |
1548 | } | |
1549 | else ko_prefix = cr = US""; | |
1550 | ||
1551 | /* Add qualify domain if permitted; otherwise an unqualified address fails. */ | |
1552 | ||
1553 | if (parse_find_at(address) == NULL) | |
1554 | { | |
1555 | if ((options & vopt_qualify) == 0) | |
1556 | { | |
1557 | if (f != NULL) | |
ce552449 NM |
1558 | respond_printf(f, "%sA domain is required for \"%s\"%s\n", |
1559 | ko_prefix, address, cr); | |
8e669ac1 | 1560 | *failure_ptr = US"qualify"; |
059ec3d9 PH |
1561 | return FAIL; |
1562 | } | |
8b9476ba | 1563 | address = rewrite_address_qualify(address, options & vopt_is_recipient); |
059ec3d9 PH |
1564 | } |
1565 | ||
1566 | DEBUG(D_verify) | |
1567 | { | |
1568 | debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1569 | debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address); | |
1570 | } | |
1571 | ||
1572 | /* Rewrite and report on it. Clear the domain and local part caches - these | |
1573 | may have been set by domains and local part tests during an ACL. */ | |
1574 | ||
1575 | if (global_rewrite_rules != NULL) | |
1576 | { | |
1577 | uschar *old = address; | |
8b9476ba | 1578 | address = rewrite_address(address, options & vopt_is_recipient, FALSE, |
059ec3d9 PH |
1579 | global_rewrite_rules, rewrite_existflags); |
1580 | if (address != old) | |
1581 | { | |
1582 | for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0; | |
1583 | for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0; | |
1584 | if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address); | |
1585 | } | |
1586 | } | |
1587 | ||
1588 | /* If this is the real sender address, we must update sender_address at | |
1589 | this point, because it may be referred to in the routers. */ | |
1590 | ||
1591 | if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0) | |
1592 | sender_address = address; | |
1593 | ||
1594 | /* If the address was rewritten to <> no verification can be done, and we have | |
1595 | to return OK. This rewriting is permitted only for sender addresses; for other | |
1596 | addresses, such rewriting fails. */ | |
1597 | ||
1598 | if (address[0] == 0) return OK; | |
1599 | ||
d9b2312b JH |
1600 | /* Flip the legacy TLS-related variables over to the outbound set in case |
1601 | they're used in the context of a transport used by verification. Reset them | |
ea90b718 | 1602 | at exit from this routine (so no returns allowed from here on). */ |
d9b2312b | 1603 | |
35aba663 | 1604 | tls_modify_variables(&tls_out); |
d9b2312b | 1605 | |
059ec3d9 PH |
1606 | /* Save a copy of the sender address for re-instating if we change it to <> |
1607 | while verifying a sender address (a nice bit of self-reference there). */ | |
1608 | ||
1609 | save_sender = sender_address; | |
1610 | ||
ea90b718 JH |
1611 | /* Observability variable for router/transport use */ |
1612 | ||
8b9476ba | 1613 | verify_mode = options & vopt_is_recipient ? US"R" : US"S"; |
ea90b718 | 1614 | |
059ec3d9 PH |
1615 | /* Update the address structure with the possibly qualified and rewritten |
1616 | address. Set it up as the starting address on the chain of new addresses. */ | |
1617 | ||
1618 | vaddr->address = address; | |
1619 | addr_new = vaddr; | |
1620 | ||
1621 | /* We need a loop, because an address can generate new addresses. We must also | |
1622 | cope with generated pipes and files at the top level. (See also the code and | |
1623 | comment in deliver.c.) However, it is usually the case that the router for | |
1624 | user's .forward files has its verify flag turned off. | |
1625 | ||
1626 | If an address generates more than one child, the loop is used only when | |
1627 | full_info is set, and this can only be set locally. Remote enquiries just get | |
1628 | information about the top level address, not anything that it generated. */ | |
1629 | ||
ea90b718 | 1630 | while (addr_new) |
059ec3d9 PH |
1631 | { |
1632 | int rc; | |
1633 | address_item *addr = addr_new; | |
1634 | ||
1635 | addr_new = addr->next; | |
1636 | addr->next = NULL; | |
1637 | ||
1638 | DEBUG(D_verify) | |
1639 | { | |
1640 | debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1641 | debug_printf("Considering %s\n", addr->address); | |
1642 | } | |
1643 | ||
1644 | /* Handle generated pipe, file or reply addresses. We don't get these | |
1645 | when handling EXPN, as it does only one level of expansion. */ | |
1646 | ||
1647 | if (testflag(addr, af_pfr)) | |
1648 | { | |
1649 | allok = FALSE; | |
1650 | if (f != NULL) | |
1651 | { | |
1652 | BOOL allow; | |
1653 | ||
1654 | if (addr->address[0] == '>') | |
1655 | { | |
1656 | allow = testflag(addr, af_allow_reply); | |
1657 | fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1); | |
1658 | } | |
1659 | else | |
1660 | { | |
1661 | allow = (addr->address[0] == '|')? | |
1662 | testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file); | |
1663 | fprintf(f, "%s -> %s", addr->parent->address, addr->address); | |
1664 | } | |
1665 | ||
1666 | if (addr->basic_errno == ERRNO_BADTRANSPORT) | |
1667 | fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n" | |
1668 | "%s\n", addr->message); | |
1669 | else if (allow) | |
1670 | fprintf(f, "\n transport = %s\n", addr->transport->name); | |
1671 | else | |
1672 | fprintf(f, " *** forbidden ***\n"); | |
1673 | } | |
1674 | continue; | |
1675 | } | |
1676 | ||
1677 | /* Just in case some router parameter refers to it. */ | |
1678 | ||
2f682e45 JH |
1679 | return_path = addr->prop.errors_address |
1680 | ? addr->prop.errors_address : sender_address; | |
059ec3d9 PH |
1681 | |
1682 | /* Split the address into domain and local part, handling the %-hack if | |
1683 | necessary, and then route it. While routing a sender address, set | |
1684 | $sender_address to <> because that is what it will be if we were trying to | |
1685 | send a bounce to the sender. */ | |
1686 | ||
2f682e45 | 1687 | if (routed) *routed = FALSE; |
059ec3d9 PH |
1688 | if ((rc = deliver_split_address(addr)) == OK) |
1689 | { | |
8b9476ba | 1690 | if (!(options & vopt_is_recipient)) sender_address = null_sender; |
059ec3d9 PH |
1691 | rc = route_address(addr, &addr_local, &addr_remote, &addr_new, |
1692 | &addr_succeed, verify_type); | |
1693 | sender_address = save_sender; /* Put back the real sender */ | |
1694 | } | |
1695 | ||
1696 | /* If routing an address succeeded, set the flag that remembers, for use when | |
1697 | an ACL cached a sender verify (in case a callout fails). Then if routing set | |
1698 | up a list of hosts or the transport has a host list, and the callout option | |
1699 | is set, and we aren't in a host checking run, do the callout verification, | |
1700 | and set another flag that notes that a callout happened. */ | |
1701 | ||
1702 | if (rc == OK) | |
1703 | { | |
2f682e45 | 1704 | if (routed) *routed = TRUE; |
059ec3d9 PH |
1705 | if (callout > 0) |
1706 | { | |
08f3b11b | 1707 | transport_instance * tp; |
2f682e45 | 1708 | host_item * host_list = addr->host_list; |
059ec3d9 | 1709 | |
26da7e20 PH |
1710 | /* Make up some data for use in the case where there is no remote |
1711 | transport. */ | |
1712 | ||
1713 | transport_feedback tf = { | |
1714 | NULL, /* interface (=> any) */ | |
1715 | US"smtp", /* port */ | |
1716 | US"smtp", /* protocol */ | |
1717 | NULL, /* hosts */ | |
1718 | US"$smtp_active_hostname", /* helo_data */ | |
1719 | FALSE, /* hosts_override */ | |
1720 | FALSE, /* hosts_randomize */ | |
1721 | FALSE, /* gethostbyname */ | |
1722 | TRUE, /* qualify_single */ | |
1723 | FALSE /* search_parents */ | |
1724 | }; | |
059ec3d9 PH |
1725 | |
1726 | /* If verification yielded a remote transport, we want to use that | |
1727 | transport's options, so as to mimic what would happen if we were really | |
1728 | sending a message to this address. */ | |
1729 | ||
08f3b11b | 1730 | if ((tp = addr->transport) && !tp->info->local) |
059ec3d9 | 1731 | { |
08f3b11b | 1732 | (void)(tp->setup)(tp, addr, &tf, 0, 0, NULL); |
059ec3d9 PH |
1733 | |
1734 | /* If the transport has hosts and the router does not, or if the | |
1735 | transport is configured to override the router's hosts, we must build a | |
1736 | host list of the transport's hosts, and find the IP addresses */ | |
1737 | ||
2f682e45 | 1738 | if (tf.hosts && (!host_list || tf.hosts_override)) |
059ec3d9 PH |
1739 | { |
1740 | uschar *s; | |
55414b25 | 1741 | const uschar *save_deliver_domain = deliver_domain; |
750af86e | 1742 | uschar *save_deliver_localpart = deliver_localpart; |
059ec3d9 PH |
1743 | |
1744 | host_list = NULL; /* Ignore the router's hosts */ | |
1745 | ||
1746 | deliver_domain = addr->domain; | |
1747 | deliver_localpart = addr->local_part; | |
1748 | s = expand_string(tf.hosts); | |
750af86e PH |
1749 | deliver_domain = save_deliver_domain; |
1750 | deliver_localpart = save_deliver_localpart; | |
059ec3d9 | 1751 | |
2f682e45 | 1752 | if (!s) |
059ec3d9 PH |
1753 | { |
1754 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts " | |
1755 | "\"%s\" in %s transport for callout: %s", tf.hosts, | |
08f3b11b | 1756 | tp->name, expand_string_message); |
059ec3d9 PH |
1757 | } |
1758 | else | |
1759 | { | |
322050c2 | 1760 | int flags; |
d8ef3577 | 1761 | host_item *host, *nexthost; |
059ec3d9 PH |
1762 | host_build_hostlist(&host_list, s, tf.hosts_randomize); |
1763 | ||
1764 | /* Just ignore failures to find a host address. If we don't manage | |
8e669ac1 PH |
1765 | to find any addresses, the callout will defer. Note that more than |
1766 | one address may be found for a single host, which will result in | |
1767 | additional host items being inserted into the chain. Hence we must | |
d8ef3577 | 1768 | save the next host first. */ |
059ec3d9 | 1769 | |
322050c2 PH |
1770 | flags = HOST_FIND_BY_A; |
1771 | if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; | |
1772 | if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS; | |
1773 | ||
2f682e45 | 1774 | for (host = host_list; host; host = nexthost) |
059ec3d9 | 1775 | { |
d8ef3577 | 1776 | nexthost = host->next; |
8e669ac1 | 1777 | if (tf.gethostbyname || |
7e66e54d | 1778 | string_is_ip_address(host->name, NULL) != 0) |
55414b25 | 1779 | (void)host_find_byname(host, NULL, flags, NULL, TRUE); |
059ec3d9 | 1780 | else |
9d9c3746 | 1781 | { |
7cd171b7 | 1782 | dnssec_domains * dnssec_domains = NULL; |
08f3b11b | 1783 | if (Ustrcmp(tp->driver_name, "smtp") == 0) |
9d9c3746 JH |
1784 | { |
1785 | smtp_transport_options_block * ob = | |
08f3b11b | 1786 | (smtp_transport_options_block *) tp->options_block; |
7cd171b7 | 1787 | dnssec_domains = &ob->dnssec; |
9d9c3746 JH |
1788 | } |
1789 | ||
059ec3d9 | 1790 | (void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
7cd171b7 | 1791 | dnssec_domains, NULL, NULL); |
9d9c3746 | 1792 | } |
059ec3d9 PH |
1793 | } |
1794 | } | |
1795 | } | |
1796 | } | |
1797 | ||
8e669ac1 | 1798 | /* Can only do a callout if we have at least one host! If the callout |
2c7db3f5 | 1799 | fails, it will have set ${sender,recipient}_verify_failure. */ |
059ec3d9 | 1800 | |
2f682e45 | 1801 | if (host_list) |
059ec3d9 PH |
1802 | { |
1803 | HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n"); | |
1804 | if (host_checking && !host_checking_callout) | |
1805 | { | |
1806 | HDEBUG(D_verify) | |
1807 | debug_printf("... callout omitted by default when host testing\n" | |
1808 | "(Use -bhc if you want the callouts to happen.)\n"); | |
1809 | } | |
1810 | else | |
1811 | { | |
4ed8d31a JH |
1812 | #ifdef SUPPORT_TLS |
1813 | deliver_set_expansions(addr); | |
1814 | #endif | |
059ec3d9 | 1815 | rc = do_callout(addr, host_list, &tf, callout, callout_overall, |
4deaf07d | 1816 | callout_connect, options, se_mailfrom, pm_mailfrom); |
059ec3d9 PH |
1817 | } |
1818 | } | |
1819 | else | |
1820 | { | |
1821 | HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor " | |
1822 | "transport provided a host list\n"); | |
1823 | } | |
1824 | } | |
1825 | } | |
8e669ac1 | 1826 | |
2c7db3f5 | 1827 | /* Otherwise, any failure is a routing failure */ |
8e669ac1 PH |
1828 | |
1829 | else *failure_ptr = US"route"; | |
059ec3d9 PH |
1830 | |
1831 | /* A router may return REROUTED if it has set up a child address as a result | |
1832 | of a change of domain name (typically from widening). In this case we always | |
1833 | want to continue to verify the new child. */ | |
1834 | ||
1835 | if (rc == REROUTED) continue; | |
8e669ac1 | 1836 | |
059ec3d9 PH |
1837 | /* Handle hard failures */ |
1838 | ||
1839 | if (rc == FAIL) | |
1840 | { | |
1841 | allok = FALSE; | |
2f682e45 | 1842 | if (f) |
059ec3d9 | 1843 | { |
e6f6568e PH |
1844 | address_item *p = addr->parent; |
1845 | ||
ce552449 | 1846 | respond_printf(f, "%s%s %s", ko_prefix, |
2f682e45 JH |
1847 | full_info ? addr->address : address, |
1848 | address_test_mode ? "is undeliverable" : "failed to verify"); | |
059ec3d9 PH |
1849 | if (!expn && admin_user) |
1850 | { | |
1851 | if (addr->basic_errno > 0) | |
ce552449 | 1852 | respond_printf(f, ": %s", strerror(addr->basic_errno)); |
2f682e45 | 1853 | if (addr->message) |
ce552449 | 1854 | respond_printf(f, ": %s", addr->message); |
e6f6568e PH |
1855 | } |
1856 | ||
1857 | /* Show parents iff doing full info */ | |
1858 | ||
2f682e45 | 1859 | if (full_info) while (p) |
e6f6568e | 1860 | { |
ce552449 | 1861 | respond_printf(f, "%s\n <-- %s", cr, p->address); |
e6f6568e | 1862 | p = p->parent; |
059ec3d9 | 1863 | } |
ce552449 | 1864 | respond_printf(f, "%s\n", cr); |
059ec3d9 | 1865 | } |
2e5b33cd | 1866 | cancel_cutthrough_connection("routing hard fail"); |
059ec3d9 | 1867 | |
d9b2312b | 1868 | if (!full_info) |
2f682e45 | 1869 | { |
d9b2312b JH |
1870 | yield = copy_error(vaddr, addr, FAIL); |
1871 | goto out; | |
2f682e45 JH |
1872 | } |
1873 | yield = FAIL; | |
059ec3d9 PH |
1874 | } |
1875 | ||
1876 | /* Soft failure */ | |
1877 | ||
1878 | else if (rc == DEFER) | |
1879 | { | |
1880 | allok = FALSE; | |
2f682e45 | 1881 | if (f) |
059ec3d9 | 1882 | { |
e6f6568e | 1883 | address_item *p = addr->parent; |
ce552449 | 1884 | respond_printf(f, "%s%s cannot be resolved at this time", ko_prefix, |
322050c2 | 1885 | full_info? addr->address : address); |
059ec3d9 PH |
1886 | if (!expn && admin_user) |
1887 | { | |
1888 | if (addr->basic_errno > 0) | |
ce552449 | 1889 | respond_printf(f, ": %s", strerror(addr->basic_errno)); |
2f682e45 | 1890 | if (addr->message) |
ce552449 | 1891 | respond_printf(f, ": %s", addr->message); |
059ec3d9 | 1892 | else if (addr->basic_errno <= 0) |
ce552449 | 1893 | respond_printf(f, ": unknown error"); |
059ec3d9 PH |
1894 | } |
1895 | ||
e6f6568e PH |
1896 | /* Show parents iff doing full info */ |
1897 | ||
2f682e45 | 1898 | if (full_info) while (p) |
e6f6568e | 1899 | { |
ce552449 | 1900 | respond_printf(f, "%s\n <-- %s", cr, p->address); |
e6f6568e PH |
1901 | p = p->parent; |
1902 | } | |
ce552449 | 1903 | respond_printf(f, "%s\n", cr); |
059ec3d9 | 1904 | } |
2e5b33cd | 1905 | cancel_cutthrough_connection("routing soft fail"); |
e4bdf652 | 1906 | |
d9b2312b JH |
1907 | if (!full_info) |
1908 | { | |
1909 | yield = copy_error(vaddr, addr, DEFER); | |
1910 | goto out; | |
1911 | } | |
2f682e45 | 1912 | if (yield == OK) yield = DEFER; |
059ec3d9 PH |
1913 | } |
1914 | ||
1915 | /* If we are handling EXPN, we do not want to continue to route beyond | |
e6f6568e | 1916 | the top level (whose address is in "address"). */ |
059ec3d9 PH |
1917 | |
1918 | else if (expn) | |
1919 | { | |
1920 | uschar *ok_prefix = US"250-"; | |
2f682e45 JH |
1921 | |
1922 | if (!addr_new) | |
1923 | if (!addr_local && !addr_remote) | |
ce552449 | 1924 | respond_printf(f, "250 mail to <%s> is discarded\r\n", address); |
059ec3d9 | 1925 | else |
ce552449 | 1926 | respond_printf(f, "250 <%s>\r\n", address); |
2f682e45 JH |
1927 | |
1928 | else do | |
059ec3d9 PH |
1929 | { |
1930 | address_item *addr2 = addr_new; | |
1931 | addr_new = addr2->next; | |
2f682e45 | 1932 | if (!addr_new) ok_prefix = US"250 "; |
ce552449 | 1933 | respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address); |
2f682e45 | 1934 | } while (addr_new); |
d9b2312b JH |
1935 | yield = OK; |
1936 | goto out; | |
059ec3d9 PH |
1937 | } |
1938 | ||
1939 | /* Successful routing other than EXPN. */ | |
1940 | ||
1941 | else | |
1942 | { | |
1943 | /* Handle successful routing when short info wanted. Otherwise continue for | |
1944 | other (generated) addresses. Short info is the operational case. Full info | |
1945 | can be requested only when debug_selector != 0 and a file is supplied. | |
1946 | ||
1947 | There is a conflict between the use of aliasing as an alternate email | |
1948 | address, and as a sort of mailing list. If an alias turns the incoming | |
1949 | address into just one address (e.g. J.Caesar->jc44) you may well want to | |
1950 | carry on verifying the generated address to ensure it is valid when | |
1951 | checking incoming mail. If aliasing generates multiple addresses, you | |
1952 | probably don't want to do this. Exim therefore treats the generation of | |
1953 | just a single new address as a special case, and continues on to verify the | |
1954 | generated address. */ | |
1955 | ||
2f682e45 JH |
1956 | if ( !full_info /* Stop if short info wanted AND */ |
1957 | && ( ( !addr_new /* No new address OR */ | |
1958 | || addr_new->next /* More than one new address OR */ | |
1959 | || testflag(addr_new, af_pfr) /* New address is pfr */ | |
1960 | ) | |
1961 | || /* OR */ | |
1962 | ( addr_new /* At least one new address AND */ | |
1963 | && success_on_redirect /* success_on_redirect is set */ | |
1964 | ) ) | |
1965 | ) | |
059ec3d9 | 1966 | { |
2f682e45 JH |
1967 | if (f) fprintf(f, "%s %s\n", |
1968 | address, address_test_mode ? "is deliverable" : "verified"); | |
059ec3d9 PH |
1969 | |
1970 | /* If we have carried on to verify a child address, we want the value | |
1971 | of $address_data to be that of the child */ | |
1972 | ||
d43cbe25 | 1973 | vaddr->prop.address_data = addr->prop.address_data; |
98c82a3d JH |
1974 | |
1975 | /* If stopped because more than one new address, cannot cutthrough */ | |
1976 | ||
1977 | if (addr_new && addr_new->next) | |
1978 | cancel_cutthrough_connection("multiple addresses from routing"); | |
1979 | ||
d9b2312b JH |
1980 | yield = OK; |
1981 | goto out; | |
059ec3d9 PH |
1982 | } |
1983 | } | |
1984 | } /* Loop for generated addresses */ | |
1985 | ||
1986 | /* Display the full results of the successful routing, including any generated | |
1987 | addresses. Control gets here only when full_info is set, which requires f not | |
1988 | to be NULL, and this occurs only when a top-level verify is called with the | |
1989 | debugging switch on. | |
1990 | ||
1991 | If there are no local and no remote addresses, and there were no pipes, files, | |
1992 | or autoreplies, and there were no errors or deferments, the message is to be | |
1993 | discarded, usually because of the use of :blackhole: in an alias file. */ | |
1994 | ||
2f682e45 | 1995 | if (allok && !addr_local && !addr_remote) |
dbcef0ea | 1996 | { |
059ec3d9 | 1997 | fprintf(f, "mail to %s is discarded\n", address); |
d9b2312b | 1998 | goto out; |
dbcef0ea | 1999 | } |
059ec3d9 | 2000 | |
dbcef0ea | 2001 | for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++) |
08f3b11b | 2002 | while (addr_list) |
059ec3d9 PH |
2003 | { |
2004 | address_item *addr = addr_list; | |
2005 | address_item *p = addr->parent; | |
08f3b11b JH |
2006 | transport_instance * tp = addr->transport; |
2007 | ||
059ec3d9 PH |
2008 | addr_list = addr->next; |
2009 | ||
2010 | fprintf(f, "%s", CS addr->address); | |
384152a6 | 2011 | #ifdef EXPERIMENTAL_SRS |
d43cbe25 JH |
2012 | if(addr->prop.srs_sender) |
2013 | fprintf(f, " [srs = %s]", addr->prop.srs_sender); | |
384152a6 | 2014 | #endif |
dbcef0ea PH |
2015 | |
2016 | /* If the address is a duplicate, show something about it. */ | |
2017 | ||
2018 | if (!testflag(addr, af_pfr)) | |
2019 | { | |
2020 | tree_node *tnode; | |
08f3b11b | 2021 | if ((tnode = tree_search(tree_duplicates, addr->unique))) |
dbcef0ea PH |
2022 | fprintf(f, " [duplicate, would not be delivered]"); |
2023 | else tree_add_duplicate(addr->unique, addr); | |
2024 | } | |
2025 | ||
2026 | /* Now show its parents */ | |
2027 | ||
08f3b11b | 2028 | for (p = addr->parent; p; p = p->parent) |
059ec3d9 | 2029 | fprintf(f, "\n <-- %s", p->address); |
059ec3d9 PH |
2030 | fprintf(f, "\n "); |
2031 | ||
2032 | /* Show router, and transport */ | |
2033 | ||
08f3b11b JH |
2034 | fprintf(f, "router = %s, transport = %s\n", |
2035 | addr->router->name, tp ? tp->name : US"unset"); | |
059ec3d9 PH |
2036 | |
2037 | /* Show any hosts that are set up by a router unless the transport | |
2038 | is going to override them; fiddle a bit to get a nice format. */ | |
2039 | ||
08f3b11b | 2040 | if (addr->host_list && tp && !tp->overrides_hosts) |
059ec3d9 PH |
2041 | { |
2042 | host_item *h; | |
2043 | int maxlen = 0; | |
2044 | int maxaddlen = 0; | |
08f3b11b JH |
2045 | for (h = addr->host_list; h; h = h->next) |
2046 | { /* get max lengths of host names, addrs */ | |
059ec3d9 PH |
2047 | int len = Ustrlen(h->name); |
2048 | if (len > maxlen) maxlen = len; | |
08f3b11b | 2049 | len = h->address ? Ustrlen(h->address) : 7; |
059ec3d9 PH |
2050 | if (len > maxaddlen) maxaddlen = len; |
2051 | } | |
08f3b11b JH |
2052 | for (h = addr->host_list; h; h = h->next) |
2053 | { | |
2054 | fprintf(f, " host %-*s ", maxlen, h->name); | |
2055 | ||
2056 | if (h->address) | |
2057 | fprintf(f, "[%s%-*c", h->address, maxaddlen+1 - Ustrlen(h->address), ']'); | |
2058 | else if (tp->info->local) | |
2059 | fprintf(f, " %-*s ", maxaddlen, ""); /* Omit [unknown] for local */ | |
2060 | else | |
2061 | fprintf(f, "[%s%-*c", "unknown", maxaddlen+1 - 7, ']'); | |
2062 | ||
2063 | if (h->mx >= 0) fprintf(f, " MX=%d", h->mx); | |
059ec3d9 | 2064 | if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port); |
08f3b11b JH |
2065 | if (running_in_test_harness && h->dnssec == DS_YES) fputs(" AD", f); |
2066 | if (h->status == hstatus_unusable) fputs(" ** unusable **", f); | |
2067 | fputc('\n', f); | |
059ec3d9 PH |
2068 | } |
2069 | } | |
2070 | } | |
059ec3d9 | 2071 | |
d9b2312b | 2072 | /* Yield will be DEFER or FAIL if any one address has, only for full_info (which is |
2c7db3f5 PH |
2073 | the -bv or -bt case). */ |
2074 | ||
d9b2312b | 2075 | out: |
ea90b718 | 2076 | verify_mode = NULL; |
35aba663 | 2077 | tls_modify_variables(&tls_in); |
d9b2312b | 2078 | |
8e669ac1 | 2079 | return yield; |
059ec3d9 PH |
2080 | } |
2081 | ||
2082 | ||
2083 | ||
2084 | ||
2085 | /************************************************* | |
2086 | * Check headers for syntax errors * | |
2087 | *************************************************/ | |
2088 | ||
2089 | /* This function checks those header lines that contain addresses, and verifies | |
2090 | that all the addresses therein are syntactially correct. | |
2091 | ||
2092 | Arguments: | |
2093 | msgptr where to put an error message | |
2094 | ||
2095 | Returns: OK | |
2096 | FAIL | |
2097 | */ | |
2098 | ||
2099 | int | |
2100 | verify_check_headers(uschar **msgptr) | |
2101 | { | |
2102 | header_line *h; | |
2103 | uschar *colon, *s; | |
1eccaa59 | 2104 | int yield = OK; |
059ec3d9 | 2105 | |
1eccaa59 | 2106 | for (h = header_list; h != NULL && yield == OK; h = h->next) |
059ec3d9 PH |
2107 | { |
2108 | if (h->type != htype_from && | |
2109 | h->type != htype_reply_to && | |
2110 | h->type != htype_sender && | |
2111 | h->type != htype_to && | |
2112 | h->type != htype_cc && | |
2113 | h->type != htype_bcc) | |
2114 | continue; | |
2115 | ||
2116 | colon = Ustrchr(h->text, ':'); | |
2117 | s = colon + 1; | |
2118 | while (isspace(*s)) s++; | |
2119 | ||
1eccaa59 PH |
2120 | /* Loop for multiple addresses in the header, enabling group syntax. Note |
2121 | that we have to reset this after the header has been scanned. */ | |
059ec3d9 | 2122 | |
1eccaa59 | 2123 | parse_allow_group = TRUE; |
059ec3d9 PH |
2124 | |
2125 | while (*s != 0) | |
2126 | { | |
2127 | uschar *ss = parse_find_address_end(s, FALSE); | |
2128 | uschar *recipient, *errmess; | |
2129 | int terminator = *ss; | |
2130 | int start, end, domain; | |
2131 | ||
2132 | /* Temporarily terminate the string at this point, and extract the | |
1eccaa59 | 2133 | operative address within, allowing group syntax. */ |
059ec3d9 PH |
2134 | |
2135 | *ss = 0; | |
2136 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
2137 | *ss = terminator; | |
2138 | ||
2139 | /* Permit an unqualified address only if the message is local, or if the | |
2140 | sending host is configured to be permitted to send them. */ | |
2141 | ||
2142 | if (recipient != NULL && domain == 0) | |
2143 | { | |
2144 | if (h->type == htype_from || h->type == htype_sender) | |
2145 | { | |
2146 | if (!allow_unqualified_sender) recipient = NULL; | |
2147 | } | |
2148 | else | |
2149 | { | |
2150 | if (!allow_unqualified_recipient) recipient = NULL; | |
2151 | } | |
2152 | if (recipient == NULL) errmess = US"unqualified address not permitted"; | |
2153 | } | |
2154 | ||
2155 | /* It's an error if no address could be extracted, except for the special | |
2156 | case of an empty address. */ | |
2157 | ||
2158 | if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0) | |
2159 | { | |
2160 | uschar *verb = US"is"; | |
2161 | uschar *t = ss; | |
1ab95fa6 | 2162 | uschar *tt = colon; |
059ec3d9 PH |
2163 | int len; |
2164 | ||
2165 | /* Arrange not to include any white space at the end in the | |
1ab95fa6 | 2166 | error message or the header name. */ |
059ec3d9 PH |
2167 | |
2168 | while (t > s && isspace(t[-1])) t--; | |
1ab95fa6 | 2169 | while (tt > h->text && isspace(tt[-1])) tt--; |
059ec3d9 | 2170 | |
1ab95fa6 | 2171 | /* Add the address that failed to the error message, since in a |
059ec3d9 PH |
2172 | header with very many addresses it is sometimes hard to spot |
2173 | which one is at fault. However, limit the amount of address to | |
2174 | quote - cases have been seen where, for example, a missing double | |
2175 | quote in a humungous To: header creates an "address" that is longer | |
2176 | than string_sprintf can handle. */ | |
2177 | ||
2178 | len = t - s; | |
2179 | if (len > 1024) | |
2180 | { | |
2181 | len = 1024; | |
2182 | verb = US"begins"; | |
2183 | } | |
2184 | ||
55414b25 JH |
2185 | /* deconst cast ok as we're passing a non-const to string_printing() */ |
2186 | *msgptr = US string_printing( | |
1ab95fa6 PH |
2187 | string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s", |
2188 | errmess, tt - h->text, h->text, verb, len, s)); | |
059ec3d9 | 2189 | |
1eccaa59 PH |
2190 | yield = FAIL; |
2191 | break; /* Out of address loop */ | |
059ec3d9 PH |
2192 | } |
2193 | ||
2194 | /* Advance to the next address */ | |
2195 | ||
2196 | s = ss + (terminator? 1:0); | |
2197 | while (isspace(*s)) s++; | |
2198 | } /* Next address */ | |
059ec3d9 | 2199 | |
1eccaa59 PH |
2200 | parse_allow_group = FALSE; |
2201 | parse_found_group = FALSE; | |
2202 | } /* Next header unless yield has been set FALSE */ | |
2203 | ||
2204 | return yield; | |
059ec3d9 PH |
2205 | } |
2206 | ||
2207 | ||
770747fd MFM |
2208 | /************************************************* |
2209 | * Check header names for 8-bit characters * | |
2210 | *************************************************/ | |
2211 | ||
4c04137d | 2212 | /* This function checks for invalid characters in header names. See |
770747fd MFM |
2213 | RFC 5322, 2.2. and RFC 6532, 3. |
2214 | ||
2215 | Arguments: | |
2216 | msgptr where to put an error message | |
2217 | ||
2218 | Returns: OK | |
2219 | FAIL | |
2220 | */ | |
2221 | ||
2222 | int | |
2223 | verify_check_header_names_ascii(uschar **msgptr) | |
2224 | { | |
2225 | header_line *h; | |
2226 | uschar *colon, *s; | |
2227 | ||
2228 | for (h = header_list; h != NULL; h = h->next) | |
2229 | { | |
2230 | colon = Ustrchr(h->text, ':'); | |
2231 | for(s = h->text; s < colon; s++) | |
2232 | { | |
2233 | if ((*s < 33) || (*s > 126)) | |
2234 | { | |
2235 | *msgptr = string_sprintf("Invalid character in header \"%.*s\" found", | |
2236 | colon - h->text, h->text); | |
2237 | return FAIL; | |
2238 | } | |
2239 | } | |
2240 | } | |
2241 | return OK; | |
2242 | } | |
059ec3d9 | 2243 | |
1c41c9cc PH |
2244 | /************************************************* |
2245 | * Check for blind recipients * | |
2246 | *************************************************/ | |
2247 | ||
2248 | /* This function checks that every (envelope) recipient is mentioned in either | |
2249 | the To: or Cc: header lines, thus detecting blind carbon copies. | |
2250 | ||
2251 | There are two ways of scanning that could be used: either scan the header lines | |
2252 | and tick off the recipients, or scan the recipients and check the header lines. | |
2253 | The original proposed patch did the former, but I have chosen to do the latter, | |
2254 | because (a) it requires no memory and (b) will use fewer resources when there | |
2255 | are many addresses in To: and/or Cc: and only one or two envelope recipients. | |
2256 | ||
2257 | Arguments: none | |
2258 | Returns: OK if there are no blind recipients | |
2259 | FAIL if there is at least one blind recipient | |
2260 | */ | |
2261 | ||
2262 | int | |
2263 | verify_check_notblind(void) | |
2264 | { | |
2265 | int i; | |
2266 | for (i = 0; i < recipients_count; i++) | |
2267 | { | |
2268 | header_line *h; | |
2269 | BOOL found = FALSE; | |
2270 | uschar *address = recipients_list[i].address; | |
2271 | ||
2272 | for (h = header_list; !found && h != NULL; h = h->next) | |
2273 | { | |
2274 | uschar *colon, *s; | |
2275 | ||
2276 | if (h->type != htype_to && h->type != htype_cc) continue; | |
2277 | ||
2278 | colon = Ustrchr(h->text, ':'); | |
2279 | s = colon + 1; | |
2280 | while (isspace(*s)) s++; | |
2281 | ||
1eccaa59 PH |
2282 | /* Loop for multiple addresses in the header, enabling group syntax. Note |
2283 | that we have to reset this after the header has been scanned. */ | |
1c41c9cc | 2284 | |
1eccaa59 | 2285 | parse_allow_group = TRUE; |
1c41c9cc PH |
2286 | |
2287 | while (*s != 0) | |
2288 | { | |
2289 | uschar *ss = parse_find_address_end(s, FALSE); | |
2290 | uschar *recipient,*errmess; | |
2291 | int terminator = *ss; | |
2292 | int start, end, domain; | |
2293 | ||
2294 | /* Temporarily terminate the string at this point, and extract the | |
1eccaa59 | 2295 | operative address within, allowing group syntax. */ |
1c41c9cc PH |
2296 | |
2297 | *ss = 0; | |
2298 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
2299 | *ss = terminator; | |
2300 | ||
2301 | /* If we found a valid recipient that has a domain, compare it with the | |
2302 | envelope recipient. Local parts are compared case-sensitively, domains | |
2303 | case-insensitively. By comparing from the start with length "domain", we | |
2304 | include the "@" at the end, which ensures that we are comparing the whole | |
2305 | local part of each address. */ | |
2306 | ||
2307 | if (recipient != NULL && domain != 0) | |
2308 | { | |
2309 | found = Ustrncmp(recipient, address, domain) == 0 && | |
2310 | strcmpic(recipient + domain, address + domain) == 0; | |
2311 | if (found) break; | |
2312 | } | |
2313 | ||
2314 | /* Advance to the next address */ | |
2315 | ||
2316 | s = ss + (terminator? 1:0); | |
2317 | while (isspace(*s)) s++; | |
2318 | } /* Next address */ | |
1eccaa59 PH |
2319 | |
2320 | parse_allow_group = FALSE; | |
2321 | parse_found_group = FALSE; | |
1c41c9cc PH |
2322 | } /* Next header (if found is false) */ |
2323 | ||
2324 | if (!found) return FAIL; | |
2325 | } /* Next recipient */ | |
2326 | ||
2327 | return OK; | |
2328 | } | |
2329 | ||
2330 | ||
059ec3d9 PH |
2331 | |
2332 | /************************************************* | |
2333 | * Find if verified sender * | |
2334 | *************************************************/ | |
2335 | ||
2336 | /* Usually, just a single address is verified as the sender of the message. | |
2337 | However, Exim can be made to verify other addresses as well (often related in | |
2338 | some way), and this is useful in some environments. There may therefore be a | |
2339 | chain of such addresses that have previously been tested. This function finds | |
2340 | whether a given address is on the chain. | |
2341 | ||
2342 | Arguments: the address to be verified | |
2343 | Returns: pointer to an address item, or NULL | |
2344 | */ | |
2345 | ||
2346 | address_item * | |
2347 | verify_checked_sender(uschar *sender) | |
2348 | { | |
2349 | address_item *addr; | |
2350 | for (addr = sender_verified_list; addr != NULL; addr = addr->next) | |
2351 | if (Ustrcmp(sender, addr->address) == 0) break; | |
2352 | return addr; | |
2353 | } | |
2354 | ||
2355 | ||
2356 | ||
2357 | ||
2358 | ||
2359 | /************************************************* | |
2360 | * Get valid header address * | |
2361 | *************************************************/ | |
2362 | ||
2363 | /* Scan the originator headers of the message, looking for an address that | |
2364 | verifies successfully. RFC 822 says: | |
2365 | ||
2366 | o The "Sender" field mailbox should be sent notices of | |
2367 | any problems in transport or delivery of the original | |
2368 | messages. If there is no "Sender" field, then the | |
2369 | "From" field mailbox should be used. | |
2370 | ||
2371 | o If the "Reply-To" field exists, then the reply should | |
2372 | go to the addresses indicated in that field and not to | |
2373 | the address(es) indicated in the "From" field. | |
2374 | ||
2375 | So we check a Sender field if there is one, else a Reply_to field, else a From | |
2376 | field. As some strange messages may have more than one of these fields, | |
2377 | especially if they are resent- fields, check all of them if there is more than | |
2378 | one. | |
2379 | ||
2380 | Arguments: | |
2381 | user_msgptr points to where to put a user error message | |
2382 | log_msgptr points to where to put a log error message | |
2383 | callout timeout for callout check (passed to verify_address()) | |
2384 | callout_overall overall callout timeout (ditto) | |
8e669ac1 | 2385 | callout_connect connect callout timeout (ditto) |
059ec3d9 PH |
2386 | se_mailfrom mailfrom for verify; NULL => "" |
2387 | pm_mailfrom sender for pm callout check (passed to verify_address()) | |
2388 | options callout options (passed to verify_address()) | |
8e669ac1 | 2389 | verrno where to put the address basic_errno |
059ec3d9 PH |
2390 | |
2391 | If log_msgptr is set to something without setting user_msgptr, the caller | |
2392 | normally uses log_msgptr for both things. | |
2393 | ||
2394 | Returns: result of the verification attempt: OK, FAIL, or DEFER; | |
2395 | FAIL is given if no appropriate headers are found | |
2396 | */ | |
2397 | ||
2398 | int | |
2399 | verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr, | |
8e669ac1 | 2400 | int callout, int callout_overall, int callout_connect, uschar *se_mailfrom, |
fe5b5d0b | 2401 | uschar *pm_mailfrom, int options, int *verrno) |
059ec3d9 PH |
2402 | { |
2403 | static int header_types[] = { htype_sender, htype_reply_to, htype_from }; | |
1eccaa59 | 2404 | BOOL done = FALSE; |
059ec3d9 PH |
2405 | int yield = FAIL; |
2406 | int i; | |
2407 | ||
1eccaa59 | 2408 | for (i = 0; i < 3 && !done; i++) |
059ec3d9 PH |
2409 | { |
2410 | header_line *h; | |
1eccaa59 | 2411 | for (h = header_list; h != NULL && !done; h = h->next) |
059ec3d9 PH |
2412 | { |
2413 | int terminator, new_ok; | |
2414 | uschar *s, *ss, *endname; | |
2415 | ||
2416 | if (h->type != header_types[i]) continue; | |
2417 | s = endname = Ustrchr(h->text, ':') + 1; | |
2418 | ||
1eccaa59 PH |
2419 | /* Scan the addresses in the header, enabling group syntax. Note that we |
2420 | have to reset this after the header has been scanned. */ | |
2421 | ||
2422 | parse_allow_group = TRUE; | |
2423 | ||
059ec3d9 PH |
2424 | while (*s != 0) |
2425 | { | |
2426 | address_item *vaddr; | |
2427 | ||
2428 | while (isspace(*s) || *s == ',') s++; | |
2429 | if (*s == 0) break; /* End of header */ | |
2430 | ||
2431 | ss = parse_find_address_end(s, FALSE); | |
2432 | ||
2433 | /* The terminator is a comma or end of header, but there may be white | |
2434 | space preceding it (including newline for the last address). Move back | |
2435 | past any white space so we can check against any cached envelope sender | |
2436 | address verifications. */ | |
2437 | ||
2438 | while (isspace(ss[-1])) ss--; | |
2439 | terminator = *ss; | |
2440 | *ss = 0; | |
2441 | ||
2442 | HDEBUG(D_verify) debug_printf("verifying %.*s header address %s\n", | |
2443 | (int)(endname - h->text), h->text, s); | |
2444 | ||
2445 | /* See if we have already verified this address as an envelope sender, | |
2446 | and if so, use the previous answer. */ | |
2447 | ||
2448 | vaddr = verify_checked_sender(s); | |
2449 | ||
2450 | if (vaddr != NULL && /* Previously checked */ | |
2451 | (callout <= 0 || /* No callout needed; OR */ | |
2452 | vaddr->special_action > 256)) /* Callout was done */ | |
2453 | { | |
2454 | new_ok = vaddr->special_action & 255; | |
2455 | HDEBUG(D_verify) debug_printf("previously checked as envelope sender\n"); | |
2456 | *ss = terminator; /* Restore shortened string */ | |
2457 | } | |
2458 | ||
2459 | /* Otherwise we run the verification now. We must restore the shortened | |
2460 | string before running the verification, so the headers are correct, in | |
2461 | case there is any rewriting. */ | |
2462 | ||
2463 | else | |
2464 | { | |
2465 | int start, end, domain; | |
1eccaa59 PH |
2466 | uschar *address = parse_extract_address(s, log_msgptr, &start, &end, |
2467 | &domain, FALSE); | |
059ec3d9 PH |
2468 | |
2469 | *ss = terminator; | |
2470 | ||
1eccaa59 PH |
2471 | /* If we found an empty address, just carry on with the next one, but |
2472 | kill the message. */ | |
2473 | ||
2474 | if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0) | |
2475 | { | |
2476 | *log_msgptr = NULL; | |
2477 | s = ss; | |
2478 | continue; | |
2479 | } | |
2480 | ||
059ec3d9 PH |
2481 | /* If verification failed because of a syntax error, fail this |
2482 | function, and ensure that the failing address gets added to the error | |
2483 | message. */ | |
2484 | ||
2485 | if (address == NULL) | |
2486 | { | |
2487 | new_ok = FAIL; | |
1eccaa59 PH |
2488 | while (ss > s && isspace(ss[-1])) ss--; |
2489 | *log_msgptr = string_sprintf("syntax error in '%.*s' header when " | |
2490 | "scanning for sender: %s in \"%.*s\"", | |
2491 | endname - h->text, h->text, *log_msgptr, ss - s, s); | |
2492 | yield = FAIL; | |
2493 | done = TRUE; | |
2494 | break; | |
059ec3d9 PH |
2495 | } |
2496 | ||
2f6603e1 | 2497 | /* Else go ahead with the sender verification. But it isn't *the* |
059ec3d9 PH |
2498 | sender of the message, so set vopt_fake_sender to stop sender_address |
2499 | being replaced after rewriting or qualification. */ | |
2500 | ||
2501 | else | |
2502 | { | |
2503 | vaddr = deliver_make_addr(address, FALSE); | |
2504 | new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender, | |
8e669ac1 | 2505 | callout, callout_overall, callout_connect, se_mailfrom, |
4deaf07d | 2506 | pm_mailfrom, NULL); |
059ec3d9 PH |
2507 | } |
2508 | } | |
2509 | ||
2510 | /* We now have the result, either newly found, or cached. If we are | |
2511 | giving out error details, set a specific user error. This means that the | |
2512 | last of these will be returned to the user if all three fail. We do not | |
2513 | set a log message - the generic one below will be used. */ | |
2514 | ||
fe5b5d0b | 2515 | if (new_ok != OK) |
059ec3d9 | 2516 | { |
8e669ac1 | 2517 | *verrno = vaddr->basic_errno; |
fe5b5d0b PH |
2518 | if (smtp_return_error_details) |
2519 | { | |
2520 | *user_msgptr = string_sprintf("Rejected after DATA: " | |
2521 | "could not verify \"%.*s\" header address\n%s: %s", | |
2522 | endname - h->text, h->text, vaddr->address, vaddr->message); | |
2523 | } | |
8e669ac1 | 2524 | } |
059ec3d9 PH |
2525 | |
2526 | /* Success or defer */ | |
2527 | ||
1eccaa59 PH |
2528 | if (new_ok == OK) |
2529 | { | |
2530 | yield = OK; | |
2531 | done = TRUE; | |
2532 | break; | |
2533 | } | |
2534 | ||
059ec3d9 PH |
2535 | if (new_ok == DEFER) yield = DEFER; |
2536 | ||
2537 | /* Move on to any more addresses in the header */ | |
2538 | ||
2539 | s = ss; | |
1eccaa59 PH |
2540 | } /* Next address */ |
2541 | ||
2542 | parse_allow_group = FALSE; | |
2543 | parse_found_group = FALSE; | |
2544 | } /* Next header, unless done */ | |
2545 | } /* Next header type unless done */ | |
059ec3d9 PH |
2546 | |
2547 | if (yield == FAIL && *log_msgptr == NULL) | |
2548 | *log_msgptr = US"there is no valid sender in any header line"; | |
2549 | ||
2550 | if (yield == DEFER && *log_msgptr == NULL) | |
2551 | *log_msgptr = US"all attempts to verify a sender in a header line deferred"; | |
2552 | ||
2553 | return yield; | |
2554 | } | |
2555 | ||
2556 | ||
2557 | ||
2558 | ||
2559 | /************************************************* | |
2560 | * Get RFC 1413 identification * | |
2561 | *************************************************/ | |
2562 | ||
2563 | /* Attempt to get an id from the sending machine via the RFC 1413 protocol. If | |
2564 | the timeout is set to zero, then the query is not done. There may also be lists | |
2565 | of hosts and nets which are exempt. To guard against malefactors sending | |
2566 | non-printing characters which could, for example, disrupt a message's headers, | |
2567 | make sure the string consists of printing characters only. | |
2568 | ||
2569 | Argument: | |
2570 | port the port to connect to; usually this is IDENT_PORT (113), but when | |
2571 | running in the test harness with -bh a different value is used. | |
2572 | ||
2573 | Returns: nothing | |
2574 | ||
2575 | Side effect: any received ident value is put in sender_ident (NULL otherwise) | |
2576 | */ | |
2577 | ||
2578 | void | |
2579 | verify_get_ident(int port) | |
2580 | { | |
2581 | int sock, host_af, qlen; | |
2582 | int received_sender_port, received_interface_port, n; | |
2583 | uschar *p; | |
2584 | uschar buffer[2048]; | |
2585 | ||
2586 | /* Default is no ident. Check whether we want to do an ident check for this | |
2587 | host. */ | |
2588 | ||
2589 | sender_ident = NULL; | |
2590 | if (rfc1413_query_timeout <= 0 || verify_check_host(&rfc1413_hosts) != OK) | |
2591 | return; | |
2592 | ||
2593 | DEBUG(D_ident) debug_printf("doing ident callback\n"); | |
2594 | ||
2595 | /* Set up a connection to the ident port of the remote host. Bind the local end | |
2596 | to the incoming interface address. If the sender host address is an IPv6 | |
2597 | address, the incoming interface address will also be IPv6. */ | |
2598 | ||
fb05276a JH |
2599 | host_af = Ustrchr(sender_host_address, ':') == NULL ? AF_INET : AF_INET6; |
2600 | if ((sock = ip_socket(SOCK_STREAM, host_af)) < 0) return; | |
059ec3d9 PH |
2601 | |
2602 | if (ip_bind(sock, host_af, interface_address, 0) < 0) | |
2603 | { | |
2604 | DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n", | |
2605 | strerror(errno)); | |
2606 | goto END_OFF; | |
2607 | } | |
2608 | ||
fb05276a JH |
2609 | if (ip_connect(sock, host_af, sender_host_address, port, |
2610 | rfc1413_query_timeout, TRUE) < 0) | |
059ec3d9 | 2611 | { |
6c6d6e48 | 2612 | if (errno == ETIMEDOUT && LOGGING(ident_timeout)) |
059ec3d9 PH |
2613 | log_write(0, LOG_MAIN, "ident connection to %s timed out", |
2614 | sender_host_address); | |
059ec3d9 | 2615 | else |
059ec3d9 PH |
2616 | DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n", |
2617 | sender_host_address, strerror(errno)); | |
059ec3d9 PH |
2618 | goto END_OFF; |
2619 | } | |
2620 | ||
2621 | /* Construct and send the query. */ | |
2622 | ||
2623 | sprintf(CS buffer, "%d , %d\r\n", sender_host_port, interface_port); | |
2624 | qlen = Ustrlen(buffer); | |
2625 | if (send(sock, buffer, qlen, 0) < 0) | |
2626 | { | |
2627 | DEBUG(D_ident) debug_printf("ident send failed: %s\n", strerror(errno)); | |
2628 | goto END_OFF; | |
2629 | } | |
2630 | ||
2631 | /* Read a response line. We put it into the rest of the buffer, using several | |
2632 | recv() calls if necessary. */ | |
2633 | ||
2634 | p = buffer + qlen; | |
2635 | ||
2636 | for (;;) | |
2637 | { | |
2638 | uschar *pp; | |
2639 | int count; | |
2640 | int size = sizeof(buffer) - (p - buffer); | |
2641 | ||
2642 | if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */ | |
2643 | count = ip_recv(sock, p, size, rfc1413_query_timeout); | |
2644 | if (count <= 0) goto END_OFF; /* Read error or EOF */ | |
2645 | ||
2646 | /* Scan what we just read, to see if we have reached the terminating \r\n. Be | |
2647 | generous, and accept a plain \n terminator as well. The only illegal | |
2648 | character is 0. */ | |
2649 | ||
2650 | for (pp = p; pp < p + count; pp++) | |
2651 | { | |
2652 | if (*pp == 0) goto END_OFF; /* Zero octet not allowed */ | |
2653 | if (*pp == '\n') | |
2654 | { | |
2655 | if (pp[-1] == '\r') pp--; | |
2656 | *pp = 0; | |
2657 | goto GOT_DATA; /* Break out of both loops */ | |
2658 | } | |
2659 | } | |
2660 | ||
2661 | /* Reached the end of the data without finding \n. Let the loop continue to | |
2662 | read some more, if there is room. */ | |
2663 | ||
2664 | p = pp; | |
2665 | } | |
2666 | ||
2667 | GOT_DATA: | |
2668 | ||
2669 | /* We have received a line of data. Check it carefully. It must start with the | |
2670 | same two port numbers that we sent, followed by data as defined by the RFC. For | |
2671 | example, | |
2672 | ||
2673 | 12345 , 25 : USERID : UNIX :root | |
2674 | ||
2675 | However, the amount of white space may be different to what we sent. In the | |
2676 | "osname" field there may be several sub-fields, comma separated. The data we | |
2677 | actually want to save follows the third colon. Some systems put leading spaces | |
2678 | in it - we discard those. */ | |
2679 | ||
2680 | if (sscanf(CS buffer + qlen, "%d , %d%n", &received_sender_port, | |
2681 | &received_interface_port, &n) != 2 || | |
2682 | received_sender_port != sender_host_port || | |
2683 | received_interface_port != interface_port) | |
2684 | goto END_OFF; | |
2685 | ||
2686 | p = buffer + qlen + n; | |
2687 | while(isspace(*p)) p++; | |
2688 | if (*p++ != ':') goto END_OFF; | |
2689 | while(isspace(*p)) p++; | |
2690 | if (Ustrncmp(p, "USERID", 6) != 0) goto END_OFF; | |
2691 | p += 6; | |
2692 | while(isspace(*p)) p++; | |
2693 | if (*p++ != ':') goto END_OFF; | |
2694 | while (*p != 0 && *p != ':') p++; | |
2695 | if (*p++ == 0) goto END_OFF; | |
2696 | while(isspace(*p)) p++; | |
2697 | if (*p == 0) goto END_OFF; | |
2698 | ||
2699 | /* The rest of the line is the data we want. We turn it into printing | |
2700 | characters when we save it, so that it cannot mess up the format of any logging | |
2701 | or Received: lines into which it gets inserted. We keep a maximum of 127 | |
55414b25 | 2702 | characters. The deconst cast is ok as we fed a nonconst to string_printing() */ |
059ec3d9 | 2703 | |
55414b25 | 2704 | sender_ident = US string_printing(string_copyn(p, 127)); |
059ec3d9 PH |
2705 | DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident); |
2706 | ||
2707 | END_OFF: | |
f1e894f3 | 2708 | (void)close(sock); |
059ec3d9 PH |
2709 | return; |
2710 | } | |
2711 | ||
2712 | ||
2713 | ||
2714 | ||
2715 | /************************************************* | |
2716 | * Match host to a single host-list item * | |
2717 | *************************************************/ | |
2718 | ||
2719 | /* This function compares a host (name or address) against a single item | |
2720 | from a host list. The host name gets looked up if it is needed and is not | |
2721 | already known. The function is called from verify_check_this_host() via | |
2722 | match_check_list(), which is why most of its arguments are in a single block. | |
2723 | ||
2724 | Arguments: | |
2725 | arg the argument block (see below) | |
2726 | ss the host-list item | |
2727 | valueptr where to pass back looked up data, or NULL | |
2728 | error for error message when returning ERROR | |
2729 | ||
2730 | The block contains: | |
32d668a5 PH |
2731 | host_name (a) the host name, or |
2732 | (b) NULL, implying use sender_host_name and | |
2733 | sender_host_aliases, looking them up if required, or | |
2734 | (c) the empty string, meaning that only IP address matches | |
2735 | are permitted | |
059ec3d9 PH |
2736 | host_address the host address |
2737 | host_ipv4 the IPv4 address taken from an IPv6 one | |
2738 | ||
2739 | Returns: OK matched | |
2740 | FAIL did not match | |
2741 | DEFER lookup deferred | |
32d668a5 PH |
2742 | ERROR (a) failed to find the host name or IP address, or |
2743 | (b) unknown lookup type specified, or | |
2744 | (c) host name encountered when only IP addresses are | |
2745 | being matched | |
059ec3d9 PH |
2746 | */ |
2747 | ||
32d668a5 | 2748 | int |
55414b25 | 2749 | check_host(void *arg, const uschar *ss, const uschar **valueptr, uschar **error) |
059ec3d9 PH |
2750 | { |
2751 | check_host_block *cb = (check_host_block *)arg; | |
32d668a5 | 2752 | int mlen = -1; |
059ec3d9 | 2753 | int maskoffset; |
32d668a5 | 2754 | BOOL iplookup = FALSE; |
059ec3d9 | 2755 | BOOL isquery = FALSE; |
32d668a5 | 2756 | BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0; |
55414b25 | 2757 | const uschar *t; |
32d668a5 | 2758 | uschar *semicolon; |
059ec3d9 PH |
2759 | uschar **aliases; |
2760 | ||
2761 | /* Optimize for the special case when the pattern is "*". */ | |
2762 | ||
2763 | if (*ss == '*' && ss[1] == 0) return OK; | |
2764 | ||
2765 | /* If the pattern is empty, it matches only in the case when there is no host - | |
2766 | this can occur in ACL checking for SMTP input using the -bs option. In this | |
2767 | situation, the host address is the empty string. */ | |
2768 | ||
2769 | if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL; | |
2770 | if (*ss == 0) return FAIL; | |
2771 | ||
32d668a5 PH |
2772 | /* If the pattern is precisely "@" then match against the primary host name, |
2773 | provided that host name matching is permitted; if it's "@[]" match against the | |
2774 | local host's IP addresses. */ | |
059ec3d9 PH |
2775 | |
2776 | if (*ss == '@') | |
2777 | { | |
32d668a5 PH |
2778 | if (ss[1] == 0) |
2779 | { | |
2780 | if (isiponly) return ERROR; | |
2781 | ss = primary_hostname; | |
2782 | } | |
059ec3d9 PH |
2783 | else if (Ustrcmp(ss, "@[]") == 0) |
2784 | { | |
2785 | ip_address_item *ip; | |
2786 | for (ip = host_find_interfaces(); ip != NULL; ip = ip->next) | |
2787 | if (Ustrcmp(ip->address, cb->host_address) == 0) return OK; | |
2788 | return FAIL; | |
2789 | } | |
2790 | } | |
2791 | ||
2792 | /* If the pattern is an IP address, optionally followed by a bitmask count, do | |
4c04137d | 2793 | a (possibly masked) comparison with the current IP address. */ |
059ec3d9 | 2794 | |
7e66e54d | 2795 | if (string_is_ip_address(ss, &maskoffset) != 0) |
059ec3d9 PH |
2796 | return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL); |
2797 | ||
1688f43b PH |
2798 | /* The pattern is not an IP address. A common error that people make is to omit |
2799 | one component of an IPv4 address, either by accident, or believing that, for | |
2800 | 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, | |
2801 | which it isn't. (Those applications that do accept 1.2.3 as an IP address | |
2802 | interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an | |
2803 | ancient specification.) To aid in debugging these cases, we give a specific | |
2804 | error if the pattern contains only digits and dots or contains a slash preceded | |
2805 | only by digits and dots (a slash at the start indicates a file name and of | |
2806 | course slashes may be present in lookups, but not preceded only by digits and | |
2807 | dots). */ | |
2808 | ||
2809 | for (t = ss; isdigit(*t) || *t == '.'; t++); | |
2810 | if (*t == 0 || (*t == '/' && t != ss)) | |
2811 | { | |
2812 | *error = US"malformed IPv4 address or address mask"; | |
2813 | return ERROR; | |
2814 | } | |
2815 | ||
32d668a5 | 2816 | /* See if there is a semicolon in the pattern */ |
059ec3d9 | 2817 | |
32d668a5 PH |
2818 | semicolon = Ustrchr(ss, ';'); |
2819 | ||
2820 | /* If we are doing an IP address only match, then all lookups must be IP | |
df199fec | 2821 | address lookups, even if there is no "net-". */ |
32d668a5 PH |
2822 | |
2823 | if (isiponly) | |
059ec3d9 | 2824 | { |
32d668a5 PH |
2825 | iplookup = semicolon != NULL; |
2826 | } | |
059ec3d9 | 2827 | |
32d668a5 | 2828 | /* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is |
df199fec PH |
2829 | a lookup on a masked IP network, in textual form. We obey this code even if we |
2830 | have already set iplookup, so as to skip over the "net-" prefix and to set the | |
2831 | mask length. The net- stuff really only applies to single-key lookups where the | |
2832 | key is implicit. For query-style lookups the key is specified in the query. | |
2833 | From release 4.30, the use of net- for query style is no longer needed, but we | |
2834 | retain it for backward compatibility. */ | |
2835 | ||
2836 | if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL) | |
32d668a5 PH |
2837 | { |
2838 | mlen = 0; | |
2839 | for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0'; | |
2840 | if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */ | |
2841 | iplookup = (*t++ == '-'); | |
2842 | } | |
1688f43b | 2843 | else t = ss; |
059ec3d9 | 2844 | |
32d668a5 | 2845 | /* Do the IP address lookup if that is indeed what we have */ |
059ec3d9 | 2846 | |
32d668a5 PH |
2847 | if (iplookup) |
2848 | { | |
2849 | int insize; | |
2850 | int search_type; | |
2851 | int incoming[4]; | |
2852 | void *handle; | |
2853 | uschar *filename, *key, *result; | |
2854 | uschar buffer[64]; | |
059ec3d9 | 2855 | |
32d668a5 | 2856 | /* Find the search type */ |
059ec3d9 | 2857 | |
32d668a5 | 2858 | search_type = search_findtype(t, semicolon - t); |
059ec3d9 | 2859 | |
32d668a5 PH |
2860 | if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", |
2861 | search_error_message); | |
059ec3d9 | 2862 | |
13b685f9 PH |
2863 | /* Adjust parameters for the type of lookup. For a query-style lookup, there |
2864 | is no file name, and the "key" is just the query. For query-style with a file | |
2865 | name, we have to fish the file off the start of the query. For a single-key | |
2866 | lookup, the key is the current IP address, masked appropriately, and | |
2867 | reconverted to text form, with the mask appended. For IPv6 addresses, specify | |
6a3bceb1 PH |
2868 | dot separators instead of colons, except when the lookup type is "iplsearch". |
2869 | */ | |
059ec3d9 | 2870 | |
13b685f9 PH |
2871 | if (mac_islookup(search_type, lookup_absfilequery)) |
2872 | { | |
2873 | filename = semicolon + 1; | |
2874 | key = filename; | |
2875 | while (*key != 0 && !isspace(*key)) key++; | |
2876 | filename = string_copyn(filename, key - filename); | |
2877 | while (isspace(*key)) key++; | |
2878 | } | |
2879 | else if (mac_islookup(search_type, lookup_querystyle)) | |
32d668a5 PH |
2880 | { |
2881 | filename = NULL; | |
2882 | key = semicolon + 1; | |
2883 | } | |
6a3bceb1 | 2884 | else /* Single-key style */ |
32d668a5 | 2885 | { |
e6d225ae | 2886 | int sep = (Ustrcmp(lookup_list[search_type]->name, "iplsearch") == 0)? |
6a3bceb1 | 2887 | ':' : '.'; |
32d668a5 PH |
2888 | insize = host_aton(cb->host_address, incoming); |
2889 | host_mask(insize, incoming, mlen); | |
6a3bceb1 | 2890 | (void)host_nmtoa(insize, incoming, mlen, buffer, sep); |
32d668a5 PH |
2891 | key = buffer; |
2892 | filename = semicolon + 1; | |
059ec3d9 | 2893 | } |
32d668a5 PH |
2894 | |
2895 | /* Now do the actual lookup; note that there is no search_close() because | |
2896 | of the caching arrangements. */ | |
2897 | ||
d4ff61d1 JH |
2898 | if (!(handle = search_open(filename, search_type, 0, NULL, NULL))) |
2899 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", search_error_message); | |
2900 | ||
32d668a5 PH |
2901 | result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL); |
2902 | if (valueptr != NULL) *valueptr = result; | |
2903 | return (result != NULL)? OK : search_find_defer? DEFER: FAIL; | |
059ec3d9 PH |
2904 | } |
2905 | ||
2906 | /* The pattern is not an IP address or network reference of any kind. That is, | |
32d668a5 PH |
2907 | it is a host name pattern. If this is an IP only match, there's an error in the |
2908 | host list. */ | |
2909 | ||
2910 | if (isiponly) | |
2911 | { | |
2912 | *error = US"cannot match host name in match_ip list"; | |
2913 | return ERROR; | |
2914 | } | |
2915 | ||
2916 | /* Check the characters of the pattern to see if they comprise only letters, | |
2917 | digits, full stops, and hyphens (the constituents of domain names). Allow | |
2918 | underscores, as they are all too commonly found. Sigh. Also, if | |
2919 | allow_utf8_domains is set, allow top-bit characters. */ | |
059ec3d9 PH |
2920 | |
2921 | for (t = ss; *t != 0; t++) | |
2922 | if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' && | |
2923 | (!allow_utf8_domains || *t < 128)) break; | |
2924 | ||
2925 | /* If the pattern is a complete domain name, with no fancy characters, look up | |
2926 | its IP address and match against that. Note that a multi-homed host will add | |
2927 | items to the chain. */ | |
2928 | ||
2929 | if (*t == 0) | |
2930 | { | |
2931 | int rc; | |
2932 | host_item h; | |
2933 | h.next = NULL; | |
2934 | h.name = ss; | |
2935 | h.address = NULL; | |
2936 | h.mx = MX_NONE; | |
9b8fadde | 2937 | |
1f155f8e JH |
2938 | /* Using byname rather than bydns here means we cannot determine dnssec |
2939 | status. On the other hand it is unclear how that could be either | |
2940 | propagated up or enforced. */ | |
2941 | ||
322050c2 | 2942 | rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE); |
059ec3d9 PH |
2943 | if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL) |
2944 | { | |
2945 | host_item *hh; | |
2946 | for (hh = &h; hh != NULL; hh = hh->next) | |
2947 | { | |
96776534 | 2948 | if (host_is_in_net(hh->address, cb->host_address, 0)) return OK; |
059ec3d9 PH |
2949 | } |
2950 | return FAIL; | |
2951 | } | |
2952 | if (rc == HOST_FIND_AGAIN) return DEFER; | |
2953 | *error = string_sprintf("failed to find IP address for %s", ss); | |
2954 | return ERROR; | |
2955 | } | |
2956 | ||
2957 | /* Almost all subsequent comparisons require the host name, and can be done | |
2958 | using the general string matching function. When this function is called for | |
2959 | outgoing hosts, the name is always given explicitly. If it is NULL, it means we | |
2960 | must use sender_host_name and its aliases, looking them up if necessary. */ | |
2961 | ||
2962 | if (cb->host_name != NULL) /* Explicit host name given */ | |
2963 | return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE, | |
2964 | valueptr); | |
2965 | ||
2966 | /* Host name not given; in principle we need the sender host name and its | |
2967 | aliases. However, for query-style lookups, we do not need the name if the | |
2968 | query does not contain $sender_host_name. From release 4.23, a reference to | |
2969 | $sender_host_name causes it to be looked up, so we don't need to do the lookup | |
2970 | on spec. */ | |
2971 | ||
2972 | if ((semicolon = Ustrchr(ss, ';')) != NULL) | |
2973 | { | |
55414b25 | 2974 | const uschar *affix; |
059ec3d9 PH |
2975 | int partial, affixlen, starflags, id; |
2976 | ||
2977 | *semicolon = 0; | |
2978 | id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags); | |
2979 | *semicolon=';'; | |
2980 | ||
2981 | if (id < 0) /* Unknown lookup type */ | |
2982 | { | |
2983 | log_write(0, LOG_MAIN|LOG_PANIC, "%s in host list item \"%s\"", | |
2984 | search_error_message, ss); | |
2985 | return DEFER; | |
2986 | } | |
13b685f9 | 2987 | isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery); |
059ec3d9 PH |
2988 | } |
2989 | ||
2990 | if (isquery) | |
2991 | { | |
2992 | switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr)) | |
2993 | { | |
2994 | case OK: return OK; | |
2995 | case DEFER: return DEFER; | |
2996 | default: return FAIL; | |
2997 | } | |
2998 | } | |
2999 | ||
3000 | /* Not a query-style lookup; must ensure the host name is present, and then we | |
3001 | do a check on the name and all its aliases. */ | |
3002 | ||
3003 | if (sender_host_name == NULL) | |
3004 | { | |
3005 | HDEBUG(D_host_lookup) | |
3006 | debug_printf("sender host name required, to match against %s\n", ss); | |
3007 | if (host_lookup_failed || host_name_lookup() != OK) | |
3008 | { | |
3009 | *error = string_sprintf("failed to find host name for %s", | |
3010 | sender_host_address);; | |
3011 | return ERROR; | |
3012 | } | |
3013 | host_build_sender_fullhost(); | |
3014 | } | |
3015 | ||
3016 | /* Match on the sender host name, using the general matching function */ | |
3017 | ||
3018 | switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE, | |
3019 | valueptr)) | |
3020 | { | |
3021 | case OK: return OK; | |
3022 | case DEFER: return DEFER; | |
3023 | } | |
3024 | ||
3025 | /* If there are aliases, try matching on them. */ | |
3026 | ||
3027 | aliases = sender_host_aliases; | |
3028 | while (*aliases != NULL) | |
3029 | { | |
3030 | switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr)) | |
3031 | { | |
3032 | case OK: return OK; | |
3033 | case DEFER: return DEFER; | |
3034 | } | |
3035 | } | |
3036 | return FAIL; | |
3037 | } | |
3038 | ||
3039 | ||
3040 | ||
3041 | ||
3042 | /************************************************* | |
3043 | * Check a specific host matches a host list * | |
3044 | *************************************************/ | |
3045 | ||
3046 | /* This function is passed a host list containing items in a number of | |
3047 | different formats and the identity of a host. Its job is to determine whether | |
3048 | the given host is in the set of hosts defined by the list. The host name is | |
3049 | passed as a pointer so that it can be looked up if needed and not already | |
3050 | known. This is commonly the case when called from verify_check_host() to check | |
3051 | an incoming connection. When called from elsewhere the host name should usually | |
3052 | be set. | |
3053 | ||
3054 | This function is now just a front end to match_check_list(), which runs common | |
3055 | code for scanning a list. We pass it the check_host() function to perform a | |
3056 | single test. | |
3057 | ||
3058 | Arguments: | |
3059 | listptr pointer to the host list | |
3060 | cache_bits pointer to cache for named lists, or NULL | |
3061 | host_name the host name or NULL, implying use sender_host_name and | |
3062 | sender_host_aliases, looking them up if required | |
3063 | host_address the IP address | |
3064 | valueptr if not NULL, data from a lookup is passed back here | |
3065 | ||
3066 | Returns: OK if the host is in the defined set | |
3067 | FAIL if the host is not in the defined set, | |
3068 | DEFER if a data lookup deferred (not a host lookup) | |
3069 | ||
3070 | If the host name was needed in order to make a comparison, and could not be | |
3071 | determined from the IP address, the result is FAIL unless the item | |
3072 | "+allow_unknown" was met earlier in the list, in which case OK is returned. */ | |
3073 | ||
3074 | int | |
55414b25 JH |
3075 | verify_check_this_host(const uschar **listptr, unsigned int *cache_bits, |
3076 | const uschar *host_name, const uschar *host_address, const uschar **valueptr) | |
059ec3d9 | 3077 | { |
d4eb88df | 3078 | int rc; |
059ec3d9 | 3079 | unsigned int *local_cache_bits = cache_bits; |
55414b25 | 3080 | const uschar *save_host_address = deliver_host_address; |
059ec3d9 PH |
3081 | check_host_block cb; |
3082 | cb.host_name = host_name; | |
3083 | cb.host_address = host_address; | |
3084 | ||
3085 | if (valueptr != NULL) *valueptr = NULL; | |
3086 | ||
3087 | /* If the host address starts off ::ffff: it is an IPv6 address in | |
3088 | IPv4-compatible mode. Find the IPv4 part for checking against IPv4 | |
3089 | addresses. */ | |
3090 | ||
3091 | cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)? | |
3092 | host_address + 7 : host_address; | |
3093 | ||
8e669ac1 PH |
3094 | /* During the running of the check, put the IP address into $host_address. In |
3095 | the case of calls from the smtp transport, it will already be there. However, | |
3096 | in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on | |
d4eb88df PH |
3097 | the safe side, any existing setting is preserved, though as I write this |
3098 | (November 2004) I can't see any cases where it is actually needed. */ | |
3099 | ||
3100 | deliver_host_address = host_address; | |
3101 | rc = match_check_list( | |
3102 | listptr, /* the list */ | |
3103 | 0, /* separator character */ | |
3104 | &hostlist_anchor, /* anchor pointer */ | |
3105 | &local_cache_bits, /* cache pointer */ | |
3106 | check_host, /* function for testing */ | |
3107 | &cb, /* argument for function */ | |
3108 | MCL_HOST, /* type of check */ | |
8e669ac1 | 3109 | (host_address == sender_host_address)? |
d4eb88df PH |
3110 | US"host" : host_address, /* text for debugging */ |
3111 | valueptr); /* where to pass back data */ | |
3112 | deliver_host_address = save_host_address; | |
8e669ac1 | 3113 | return rc; |
059ec3d9 PH |
3114 | } |
3115 | ||
3116 | ||
3117 | ||
3118 | ||
5130845b JH |
3119 | /************************************************* |
3120 | * Check the given host item matches a list * | |
3121 | *************************************************/ | |
3122 | int | |
3123 | verify_check_given_host(uschar **listptr, host_item *host) | |
3124 | { | |
55414b25 | 3125 | return verify_check_this_host(CUSS listptr, NULL, host->name, host->address, NULL); |
5130845b JH |
3126 | } |
3127 | ||
059ec3d9 PH |
3128 | /************************************************* |
3129 | * Check the remote host matches a list * | |
3130 | *************************************************/ | |
3131 | ||
3132 | /* This is a front end to verify_check_this_host(), created because checking | |
3133 | the remote host is a common occurrence. With luck, a good compiler will spot | |
3134 | the tail recursion and optimize it. If there's no host address, this is | |
3135 | command-line SMTP input - check against an empty string for the address. | |
3136 | ||
3137 | Arguments: | |
3138 | listptr pointer to the host list | |
3139 | ||
3140 | Returns: the yield of verify_check_this_host(), | |
3141 | i.e. OK, FAIL, or DEFER | |
3142 | */ | |
3143 | ||
3144 | int | |
3145 | verify_check_host(uschar **listptr) | |
3146 | { | |
55414b25 | 3147 | return verify_check_this_host(CUSS listptr, sender_host_cache, NULL, |
059ec3d9 PH |
3148 | (sender_host_address == NULL)? US"" : sender_host_address, NULL); |
3149 | } | |
3150 | ||
3151 | ||
3152 | ||
3153 | ||
3154 | ||
3155 | /************************************************* | |
83e029d5 | 3156 | * Invert an IP address * |
059ec3d9 PH |
3157 | *************************************************/ |
3158 | ||
83e029d5 PP |
3159 | /* Originally just used for DNS xBL lists, now also used for the |
3160 | reverse_ip expansion operator. | |
3161 | ||
059ec3d9 PH |
3162 | Arguments: |
3163 | buffer where to put the answer | |
3164 | address the address to invert | |
3165 | */ | |
3166 | ||
83e029d5 | 3167 | void |
059ec3d9 PH |
3168 | invert_address(uschar *buffer, uschar *address) |
3169 | { | |
3170 | int bin[4]; | |
3171 | uschar *bptr = buffer; | |
3172 | ||
3173 | /* If this is an IPv4 address mapped into IPv6 format, adjust the pointer | |
3174 | to the IPv4 part only. */ | |
3175 | ||
3176 | if (Ustrncmp(address, "::ffff:", 7) == 0) address += 7; | |
3177 | ||
3178 | /* Handle IPv4 address: when HAVE_IPV6 is false, the result of host_aton() is | |
3179 | always 1. */ | |
3180 | ||
3181 | if (host_aton(address, bin) == 1) | |
3182 | { | |
3183 | int i; | |
3184 | int x = bin[0]; | |
3185 | for (i = 0; i < 4; i++) | |
3186 | { | |
3187 | sprintf(CS bptr, "%d.", x & 255); | |
3188 | while (*bptr) bptr++; | |
3189 | x >>= 8; | |
3190 | } | |
3191 | } | |
3192 | ||
3193 | /* Handle IPv6 address. Actually, as far as I know, there are no IPv6 addresses | |
3194 | in any DNS black lists, and the format in which they will be looked up is | |
3195 | unknown. This is just a guess. */ | |
3196 | ||
3197 | #if HAVE_IPV6 | |
3198 | else | |
3199 | { | |
3200 | int i, j; | |
3201 | for (j = 3; j >= 0; j--) | |
3202 | { | |
3203 | int x = bin[j]; | |
3204 | for (i = 0; i < 8; i++) | |
3205 | { | |
3206 | sprintf(CS bptr, "%x.", x & 15); | |
3207 | while (*bptr) bptr++; | |
3208 | x >>= 4; | |
3209 | } | |
3210 | } | |
3211 | } | |
3212 | #endif | |
d6f6e0dc PH |
3213 | |
3214 | /* Remove trailing period -- this is needed so that both arbitrary | |
3215 | dnsbl keydomains and inverted addresses may be combined with the | |
3216 | same format string, "%s.%s" */ | |
3217 | ||
3218 | *(--bptr) = 0; | |
059ec3d9 PH |
3219 | } |
3220 | ||
3221 | ||
3222 | ||
0bcb2a0e PH |
3223 | /************************************************* |
3224 | * Perform a single dnsbl lookup * | |
3225 | *************************************************/ | |
3226 | ||
d6f6e0dc PH |
3227 | /* This function is called from verify_check_dnsbl() below. It is also called |
3228 | recursively from within itself when domain and domain_txt are different | |
3229 | pointers, in order to get the TXT record from the alternate domain. | |
0bcb2a0e PH |
3230 | |
3231 | Arguments: | |
d6f6e0dc PH |
3232 | domain the outer dnsbl domain |
3233 | domain_txt alternate domain to lookup TXT record on success; when the | |
3234 | same domain is to be used, domain_txt == domain (that is, | |
3235 | the pointers must be identical, not just the text) | |
8e669ac1 | 3236 | keydomain the current keydomain (for debug message) |
d6f6e0dc PH |
3237 | prepend subdomain to lookup (like keydomain, but |
3238 | reversed if IP address) | |
3239 | iplist the list of matching IP addresses, or NULL for "any" | |
8e669ac1 | 3240 | bitmask true if bitmask matching is wanted |
431b7361 PH |
3241 | match_type condition for 'succeed' result |
3242 | 0 => Any RR in iplist (=) | |
3243 | 1 => No RR in iplist (!=) | |
3244 | 2 => All RRs in iplist (==) | |
3245 | 3 => Some RRs not in iplist (!==) | |
3246 | the two bits are defined as MT_NOT and MT_ALL | |
8e669ac1 | 3247 | defer_return what to return for a defer |
0bcb2a0e PH |
3248 | |
3249 | Returns: OK if lookup succeeded | |
3250 | FAIL if not | |
3251 | */ | |
3252 | ||
3253 | static int | |
d6f6e0dc | 3254 | one_check_dnsbl(uschar *domain, uschar *domain_txt, uschar *keydomain, |
431b7361 | 3255 | uschar *prepend, uschar *iplist, BOOL bitmask, int match_type, |
d6f6e0dc | 3256 | int defer_return) |
8e669ac1 | 3257 | { |
0bcb2a0e PH |
3258 | dns_answer dnsa; |
3259 | dns_scan dnss; | |
3260 | tree_node *t; | |
3261 | dnsbl_cache_block *cb; | |
3262 | int old_pool = store_pool; | |
d6f6e0dc PH |
3263 | uschar query[256]; /* DNS domain max length */ |
3264 | ||
3265 | /* Construct the specific query domainname */ | |
3266 | ||
3267 | if (!string_format(query, sizeof(query), "%s.%s", prepend, domain)) | |
3268 | { | |
3269 | log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long " | |
3270 | "(ignored): %s...", query); | |
3271 | return FAIL; | |
3272 | } | |
0bcb2a0e PH |
3273 | |
3274 | /* Look for this query in the cache. */ | |
3275 | ||
14b3c5bc JH |
3276 | if ( (t = tree_search(dnsbl_cache, query)) |
3277 | && (cb = t->data.ptr)->expiry > time(NULL) | |
3278 | ) | |
3279 | ||
3280 | /* Previous lookup was cached */ | |
3281 | ||
3282 | { | |
3283 | HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n"); | |
3284 | } | |
0bcb2a0e PH |
3285 | |
3286 | /* If not cached from a previous lookup, we must do a DNS lookup, and | |
3287 | cache the result in permanent memory. */ | |
3288 | ||
14b3c5bc | 3289 | else |
0bcb2a0e | 3290 | { |
e162fc97 | 3291 | uint ttl = 3600; |
14b3c5bc | 3292 | |
0bcb2a0e PH |
3293 | store_pool = POOL_PERM; |
3294 | ||
14b3c5bc JH |
3295 | if (t) |
3296 | { | |
3297 | HDEBUG(D_dnsbl) debug_printf("cached data found but past valid time; "); | |
3298 | } | |
0bcb2a0e | 3299 | |
14b3c5bc JH |
3300 | else |
3301 | { /* Set up a tree entry to cache the lookup */ | |
3302 | t = store_get(sizeof(tree_node) + Ustrlen(query)); | |
3303 | Ustrcpy(t->name, query); | |
3304 | t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block)); | |
3305 | (void)tree_insertnode(&dnsbl_cache, t); | |
3306 | } | |
0bcb2a0e | 3307 | |
4c04137d | 3308 | /* Do the DNS lookup . */ |
0bcb2a0e PH |
3309 | |
3310 | HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query); | |
3311 | cb->rc = dns_basic_lookup(&dnsa, query, T_A); | |
3312 | cb->text_set = FALSE; | |
3313 | cb->text = NULL; | |
3314 | cb->rhs = NULL; | |
3315 | ||
3316 | /* If the lookup succeeded, cache the RHS address. The code allows for | |
3317 | more than one address - this was for complete generality and the possible | |
3318 | use of A6 records. However, A6 records have been reduced to experimental | |
3319 | status (August 2001) and may die out. So they may never get used at all, | |
3320 | let alone in dnsbl records. However, leave the code here, just in case. | |
3321 | ||
3322 | Quite apart from one A6 RR generating multiple addresses, there are DNS | |
3323 | lists that return more than one A record, so we must handle multiple | |
e162fc97 JH |
3324 | addresses generated in that way as well. |
3325 | ||
3326 | Mark the cache entry with the "now" plus the minimum of the address TTLs, | |
3327 | or some suitably far-future time if none were found. */ | |
0bcb2a0e PH |
3328 | |
3329 | if (cb->rc == DNS_SUCCEED) | |
3330 | { | |
3331 | dns_record *rr; | |
3332 | dns_address **addrp = &(cb->rhs); | |
3333 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
e1a3f32f | 3334 | rr; |
0bcb2a0e PH |
3335 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) |
3336 | { | |
3337 | if (rr->type == T_A) | |
3338 | { | |
3339 | dns_address *da = dns_address_from_rr(&dnsa, rr); | |
e1a3f32f | 3340 | if (da) |
0bcb2a0e PH |
3341 | { |
3342 | *addrp = da; | |
3343 | while (da->next != NULL) da = da->next; | |
3344 | addrp = &(da->next); | |
14b3c5bc | 3345 | if (ttl > rr->ttl) ttl = rr->ttl; |
0bcb2a0e PH |
3346 | } |
3347 | } | |
3348 | } | |
3349 | ||
3350 | /* If we didn't find any A records, change the return code. This can | |
3351 | happen when there is a CNAME record but there are no A records for what | |
3352 | it points to. */ | |
3353 | ||
3354 | if (cb->rhs == NULL) cb->rc = DNS_NODATA; | |
3355 | } | |
3356 | ||
14b3c5bc | 3357 | cb->expiry = time(NULL)+ttl; |
0bcb2a0e PH |
3358 | store_pool = old_pool; |
3359 | } | |
3360 | ||
0bcb2a0e PH |
3361 | /* We now have the result of the DNS lookup, either newly done, or cached |
3362 | from a previous call. If the lookup succeeded, check against the address | |
3363 | list if there is one. This may be a positive equality list (introduced by | |
3364 | "="), a negative equality list (introduced by "!="), a positive bitmask | |
3365 | list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/ | |
3366 | ||
3367 | if (cb->rc == DNS_SUCCEED) | |
3368 | { | |
3369 | dns_address *da = NULL; | |
3370 | uschar *addlist = cb->rhs->address; | |
3371 | ||
3372 | /* For A and AAAA records, there may be multiple addresses from multiple | |
3373 | records. For A6 records (currently not expected to be used) there may be | |
3374 | multiple addresses from a single record. */ | |
3375 | ||
3376 | for (da = cb->rhs->next; da != NULL; da = da->next) | |
3377 | addlist = string_sprintf("%s, %s", addlist, da->address); | |
3378 | ||
3379 | HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n", | |
3380 | query, addlist); | |
3381 | ||
3382 | /* Address list check; this can be either for equality, or via a bitmask. | |
3383 | In the latter case, all the bits must match. */ | |
3384 | ||
3385 | if (iplist != NULL) | |
3386 | { | |
431b7361 | 3387 | for (da = cb->rhs; da != NULL; da = da->next) |
0bcb2a0e | 3388 | { |
431b7361 PH |
3389 | int ipsep = ','; |
3390 | uschar ip[46]; | |
55414b25 | 3391 | const uschar *ptr = iplist; |
431b7361 PH |
3392 | uschar *res; |
3393 | ||
0bcb2a0e | 3394 | /* Handle exact matching */ |
431b7361 | 3395 | |
0bcb2a0e PH |
3396 | if (!bitmask) |
3397 | { | |
431b7361 | 3398 | while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL) |
0bcb2a0e PH |
3399 | { |
3400 | if (Ustrcmp(CS da->address, ip) == 0) break; | |
3401 | } | |
3402 | } | |
431b7361 | 3403 | |
0bcb2a0e | 3404 | /* Handle bitmask matching */ |
431b7361 | 3405 | |
0bcb2a0e PH |
3406 | else |
3407 | { | |
3408 | int address[4]; | |
3409 | int mask = 0; | |
3410 | ||
3411 | /* At present, all known DNS blocking lists use A records, with | |
3412 | IPv4 addresses on the RHS encoding the information they return. I | |
3413 | wonder if this will linger on as the last vestige of IPv4 when IPv6 | |
3414 | is ubiquitous? Anyway, for now we use paranoia code to completely | |
3415 | ignore IPv6 addresses. The default mask is 0, which always matches. | |
3416 | We change this only for IPv4 addresses in the list. */ | |
3417 | ||
431b7361 | 3418 | if (host_aton(da->address, address) == 1) mask = address[0]; |
0bcb2a0e PH |
3419 | |
3420 | /* Scan the returned addresses, skipping any that are IPv6 */ | |
3421 | ||
431b7361 | 3422 | while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL) |
0bcb2a0e | 3423 | { |
431b7361 PH |
3424 | if (host_aton(ip, address) != 1) continue; |
3425 | if ((address[0] & mask) == address[0]) break; | |
0bcb2a0e PH |
3426 | } |
3427 | } | |
3428 | ||
431b7361 PH |
3429 | /* If either |
3430 | ||
3431 | (a) An IP address in an any ('=') list matched, or | |
3432 | (b) No IP address in an all ('==') list matched | |
0bcb2a0e | 3433 | |
431b7361 PH |
3434 | then we're done searching. */ |
3435 | ||
3436 | if (((match_type & MT_ALL) != 0) == (res == NULL)) break; | |
0bcb2a0e PH |
3437 | } |
3438 | ||
431b7361 | 3439 | /* If da == NULL, either |
0bcb2a0e | 3440 | |
431b7361 PH |
3441 | (a) No IP address in an any ('=') list matched, or |
3442 | (b) An IP address in an all ('==') list didn't match | |
0bcb2a0e | 3443 | |
431b7361 PH |
3444 | so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on |
3445 | the list. */ | |
0bcb2a0e | 3446 | |
431b7361 | 3447 | if ((match_type == MT_NOT || match_type == MT_ALL) != (da == NULL)) |
0bcb2a0e PH |
3448 | { |
3449 | HDEBUG(D_dnsbl) | |
3450 | { | |
431b7361 PH |
3451 | uschar *res = NULL; |
3452 | switch(match_type) | |
3453 | { | |
3454 | case 0: | |
3455 | res = US"was no match"; | |
3456 | break; | |
3457 | case MT_NOT: | |
3458 | res = US"was an exclude match"; | |
3459 | break; | |
3460 | case MT_ALL: | |
3461 | res = US"was an IP address that did not match"; | |
3462 | break; | |
3463 | case MT_NOT|MT_ALL: | |
3464 | res = US"were no IP addresses that did not match"; | |
3465 | break; | |
3466 | } | |
0bcb2a0e | 3467 | debug_printf("=> but we are not accepting this block class because\n"); |
431b7361 PH |
3468 | debug_printf("=> there %s for %s%c%s\n", |
3469 | res, | |
3470 | ((match_type & MT_ALL) == 0)? "" : "=", | |
3471 | bitmask? '&' : '=', iplist); | |
0bcb2a0e | 3472 | } |
8e669ac1 | 3473 | return FAIL; |
0bcb2a0e PH |
3474 | } |
3475 | } | |
3476 | ||
d6f6e0dc PH |
3477 | /* Either there was no IP list, or the record matched, implying that the |
3478 | domain is on the list. We now want to find a corresponding TXT record. If an | |
3479 | alternate domain is specified for the TXT record, call this function | |
3480 | recursively to look that up; this has the side effect of re-checking that | |
3481 | there is indeed an A record at the alternate domain. */ | |
3482 | ||
3483 | if (domain_txt != domain) | |
3484 | return one_check_dnsbl(domain_txt, domain_txt, keydomain, prepend, NULL, | |
431b7361 | 3485 | FALSE, match_type, defer_return); |
d6f6e0dc PH |
3486 | |
3487 | /* If there is no alternate domain, look up a TXT record in the main domain | |
3488 | if it has not previously been cached. */ | |
0bcb2a0e PH |
3489 | |
3490 | if (!cb->text_set) | |
3491 | { | |
3492 | cb->text_set = TRUE; | |
3493 | if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED) | |
3494 | { | |
3495 | dns_record *rr; | |
3496 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
3497 | rr != NULL; | |
3498 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
3499 | if (rr->type == T_TXT) break; | |
3500 | if (rr != NULL) | |
3501 | { | |
3502 | int len = (rr->data)[0]; | |
3503 | if (len > 511) len = 127; | |
3504 | store_pool = POOL_PERM; | |
3505 | cb->text = string_sprintf("%.*s", len, (const uschar *)(rr->data+1)); | |
3506 | store_pool = old_pool; | |
3507 | } | |
3508 | } | |
3509 | } | |
3510 | ||
3511 | dnslist_value = addlist; | |
3512 | dnslist_text = cb->text; | |
3513 | return OK; | |
3514 | } | |
3515 | ||
3516 | /* There was a problem with the DNS lookup */ | |
3517 | ||
3518 | if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA) | |
3519 | { | |
3520 | log_write(L_dnslist_defer, LOG_MAIN, | |
3521 | "DNS list lookup defer (probably timeout) for %s: %s", query, | |
3522 | (defer_return == OK)? US"assumed in list" : | |
3523 | (defer_return == FAIL)? US"assumed not in list" : | |
3524 | US"returned DEFER"); | |
3525 | return defer_return; | |
3526 | } | |
3527 | ||
3528 | /* No entry was found in the DNS; continue for next domain */ | |
3529 | ||
3530 | HDEBUG(D_dnsbl) | |
3531 | { | |
3532 | debug_printf("DNS lookup for %s failed\n", query); | |
3533 | debug_printf("=> that means %s is not listed at %s\n", | |
3534 | keydomain, domain); | |
3535 | } | |
3536 | ||
3537 | return FAIL; | |
3538 | } | |
3539 | ||
3540 | ||
3541 | ||
3542 | ||
059ec3d9 PH |
3543 | /************************************************* |
3544 | * Check host against DNS black lists * | |
3545 | *************************************************/ | |
3546 | ||
3547 | /* This function runs checks against a list of DNS black lists, until one | |
3548 | matches. Each item on the list can be of the form | |
3549 | ||
3550 | domain=ip-address/key | |
3551 | ||
3552 | The domain is the right-most domain that is used for the query, for example, | |
3553 | blackholes.mail-abuse.org. If the IP address is present, there is a match only | |
3554 | if the DNS lookup returns a matching IP address. Several addresses may be | |
3555 | given, comma-separated, for example: x.y.z=127.0.0.1,127.0.0.2. | |
3556 | ||
3557 | If no key is given, what is looked up in the domain is the inverted IP address | |
3558 | of the current client host. If a key is given, it is used to construct the | |
d6f6e0dc | 3559 | domain for the lookup. For example: |
059ec3d9 PH |
3560 | |
3561 | dsn.rfc-ignorant.org/$sender_address_domain | |
3562 | ||
3563 | After finding a match in the DNS, the domain is placed in $dnslist_domain, and | |
3564 | then we check for a TXT record for an error message, and if found, save its | |
3565 | value in $dnslist_text. We also cache everything in a tree, to optimize | |
3566 | multiple lookups. | |
3567 | ||
d6f6e0dc PH |
3568 | The TXT record is normally looked up in the same domain as the A record, but |
3569 | when many lists are combined in a single DNS domain, this will not be a very | |
3570 | specific message. It is possible to specify a different domain for looking up | |
3571 | TXT records; this is given before the main domain, comma-separated. For | |
3572 | example: | |
3573 | ||
3574 | dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \ | |
3575 | socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3 | |
3576 | ||
3577 | The caching ensures that only one lookup in dnsbl.sorbs.net is done. | |
3578 | ||
059ec3d9 PH |
3579 | Note: an address for testing RBL is 192.203.178.39 |
3580 | Note: an address for testing DUL is 192.203.178.4 | |
3581 | Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org | |
3582 | ||
3583 | Arguments: | |
379ba7d0 | 3584 | where the acl type |
059ec3d9 | 3585 | listptr the domain/address/data list |
379ba7d0 | 3586 | log_msgptr log message on error |
059ec3d9 PH |
3587 | |
3588 | Returns: OK successful lookup (i.e. the address is on the list), or | |
3589 | lookup deferred after +include_unknown | |
3590 | FAIL name not found, or no data found for the given type, or | |
3591 | lookup deferred after +exclude_unknown (default) | |
3592 | DEFER lookup failure, if +defer_unknown was set | |
3593 | */ | |
3594 | ||
3595 | int | |
379ba7d0 | 3596 | verify_check_dnsbl(int where, const uschar ** listptr, uschar ** log_msgptr) |
059ec3d9 PH |
3597 | { |
3598 | int sep = 0; | |
3599 | int defer_return = FAIL; | |
55414b25 | 3600 | const uschar *list = *listptr; |
059ec3d9 PH |
3601 | uschar *domain; |
3602 | uschar *s; | |
3603 | uschar buffer[1024]; | |
059ec3d9 PH |
3604 | uschar revadd[128]; /* Long enough for IPv6 address */ |
3605 | ||
3606 | /* Indicate that the inverted IP address is not yet set up */ | |
3607 | ||
3608 | revadd[0] = 0; | |
3609 | ||
0bcb2a0e PH |
3610 | /* In case this is the first time the DNS resolver is being used. */ |
3611 | ||
8c51eead | 3612 | dns_init(FALSE, FALSE, FALSE); /*XXX dnssec? */ |
0bcb2a0e | 3613 | |
059ec3d9 PH |
3614 | /* Loop through all the domains supplied, until something matches */ |
3615 | ||
3616 | while ((domain = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL) | |
3617 | { | |
0bcb2a0e | 3618 | int rc; |
059ec3d9 | 3619 | BOOL bitmask = FALSE; |
431b7361 | 3620 | int match_type = 0; |
d6f6e0dc PH |
3621 | uschar *domain_txt; |
3622 | uschar *comma; | |
059ec3d9 PH |
3623 | uschar *iplist; |
3624 | uschar *key; | |
059ec3d9 PH |
3625 | |
3626 | HDEBUG(D_dnsbl) debug_printf("DNS list check: %s\n", domain); | |
3627 | ||
3628 | /* Deal with special values that change the behaviour on defer */ | |
3629 | ||
3630 | if (domain[0] == '+') | |
3631 | { | |
3632 | if (strcmpic(domain, US"+include_unknown") == 0) defer_return = OK; | |
3633 | else if (strcmpic(domain, US"+exclude_unknown") == 0) defer_return = FAIL; | |
3634 | else if (strcmpic(domain, US"+defer_unknown") == 0) defer_return = DEFER; | |
3635 | else | |
3636 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown item in dnslist (ignored): %s", | |
3637 | domain); | |
3638 | continue; | |
3639 | } | |
3640 | ||
3641 | /* See if there's explicit data to be looked up */ | |
3642 | ||
379ba7d0 | 3643 | if ((key = Ustrchr(domain, '/'))) *key++ = 0; |
059ec3d9 PH |
3644 | |
3645 | /* See if there's a list of addresses supplied after the domain name. This is | |
431b7361 PH |
3646 | introduced by an = or a & character; if preceded by = we require all matches |
3647 | and if preceded by ! we invert the result. */ | |
059ec3d9 | 3648 | |
379ba7d0 | 3649 | if (!(iplist = Ustrchr(domain, '='))) |
059ec3d9 PH |
3650 | { |
3651 | bitmask = TRUE; | |
3652 | iplist = Ustrchr(domain, '&'); | |
3653 | } | |
3654 | ||
379ba7d0 | 3655 | if (iplist) /* Found either = or & */ |
059ec3d9 | 3656 | { |
431b7361 | 3657 | if (iplist > domain && iplist[-1] == '!') /* Handle preceding ! */ |
059ec3d9 | 3658 | { |
431b7361 | 3659 | match_type |= MT_NOT; |
059ec3d9 PH |
3660 | iplist[-1] = 0; |
3661 | } | |
431b7361 PH |
3662 | |
3663 | *iplist++ = 0; /* Terminate domain, move on */ | |
3664 | ||
3665 | /* If we found = (bitmask == FALSE), check for == or =& */ | |
3666 | ||
3667 | if (!bitmask && (*iplist == '=' || *iplist == '&')) | |
3668 | { | |
3669 | bitmask = *iplist++ == '&'; | |
3670 | match_type |= MT_ALL; | |
3671 | } | |
059ec3d9 PH |
3672 | } |
3673 | ||
379ba7d0 | 3674 | |
d6f6e0dc PH |
3675 | /* If there is a comma in the domain, it indicates that a second domain for |
3676 | looking up TXT records is provided, before the main domain. Otherwise we must | |
3677 | set domain_txt == domain. */ | |
3678 | ||
3679 | domain_txt = domain; | |
3680 | comma = Ustrchr(domain, ','); | |
3681 | if (comma != NULL) | |
3682 | { | |
3683 | *comma++ = 0; | |
3684 | domain = comma; | |
3685 | } | |
3686 | ||
059ec3d9 PH |
3687 | /* Check that what we have left is a sensible domain name. There is no reason |
3688 | why these domains should in fact use the same syntax as hosts and email | |
3689 | domains, but in practice they seem to. However, there is little point in | |
3690 | actually causing an error here, because that would no doubt hold up incoming | |
3691 | mail. Instead, I'll just log it. */ | |
3692 | ||
3693 | for (s = domain; *s != 0; s++) | |
3694 | { | |
09dcaba9 | 3695 | if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_') |
059ec3d9 PH |
3696 | { |
3697 | log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains " | |
3698 | "strange characters - is this right?", domain); | |
3699 | break; | |
3700 | } | |
3701 | } | |
3702 | ||
d6f6e0dc PH |
3703 | /* Check the alternate domain if present */ |
3704 | ||
3705 | if (domain_txt != domain) for (s = domain_txt; *s != 0; s++) | |
3706 | { | |
09dcaba9 | 3707 | if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_') |
d6f6e0dc PH |
3708 | { |
3709 | log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains " | |
3710 | "strange characters - is this right?", domain_txt); | |
3711 | break; | |
3712 | } | |
3713 | } | |
3714 | ||
8e669ac1 | 3715 | /* If there is no key string, construct the query by adding the domain name |
0bcb2a0e | 3716 | onto the inverted host address, and perform a single DNS lookup. */ |
8e669ac1 | 3717 | |
059ec3d9 PH |
3718 | if (key == NULL) |
3719 | { | |
379ba7d0 JH |
3720 | if (where == ACL_WHERE_NOTSMTP_START || where == ACL_WHERE_NOTSMTP) |
3721 | { | |
3722 | *log_msgptr = string_sprintf | |
3723 | ("cannot test auto-keyed dnslists condition in %s ACL", | |
3724 | acl_wherenames[where]); | |
3725 | return ERROR; | |
3726 | } | |
059ec3d9 PH |
3727 | if (sender_host_address == NULL) return FAIL; /* can never match */ |
3728 | if (revadd[0] == 0) invert_address(revadd, sender_host_address); | |
d6f6e0dc | 3729 | rc = one_check_dnsbl(domain, domain_txt, sender_host_address, revadd, |
431b7361 | 3730 | iplist, bitmask, match_type, defer_return); |
0bcb2a0e PH |
3731 | if (rc == OK) |
3732 | { | |
d6f6e0dc | 3733 | dnslist_domain = string_copy(domain_txt); |
93655c46 | 3734 | dnslist_matched = string_copy(sender_host_address); |
8e669ac1 | 3735 | HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n", |
d6f6e0dc | 3736 | sender_host_address, dnslist_domain); |
0bcb2a0e | 3737 | } |
0bcb2a0e | 3738 | if (rc != FAIL) return rc; /* OK or DEFER */ |
059ec3d9 | 3739 | } |
8e669ac1 PH |
3740 | |
3741 | /* If there is a key string, it can be a list of domains or IP addresses to | |
0bcb2a0e | 3742 | be concatenated with the main domain. */ |
8e669ac1 | 3743 | |
059ec3d9 PH |
3744 | else |
3745 | { | |
0bcb2a0e | 3746 | int keysep = 0; |
8e669ac1 PH |
3747 | BOOL defer = FALSE; |
3748 | uschar *keydomain; | |
0bcb2a0e | 3749 | uschar keybuffer[256]; |
d6f6e0dc | 3750 | uschar keyrevadd[128]; |
8e669ac1 | 3751 | |
55414b25 | 3752 | while ((keydomain = string_nextinlist(CUSS &key, &keysep, keybuffer, |
0bcb2a0e | 3753 | sizeof(keybuffer))) != NULL) |
8e669ac1 | 3754 | { |
d6f6e0dc PH |
3755 | uschar *prepend = keydomain; |
3756 | ||
7e66e54d | 3757 | if (string_is_ip_address(keydomain, NULL) != 0) |
059ec3d9 | 3758 | { |
0bcb2a0e | 3759 | invert_address(keyrevadd, keydomain); |
d6f6e0dc | 3760 | prepend = keyrevadd; |
059ec3d9 | 3761 | } |
8e669ac1 | 3762 | |
d6f6e0dc | 3763 | rc = one_check_dnsbl(domain, domain_txt, keydomain, prepend, iplist, |
431b7361 | 3764 | bitmask, match_type, defer_return); |
8e669ac1 | 3765 | |
0bcb2a0e | 3766 | if (rc == OK) |
059ec3d9 | 3767 | { |
d6f6e0dc | 3768 | dnslist_domain = string_copy(domain_txt); |
93655c46 | 3769 | dnslist_matched = string_copy(keydomain); |
8e669ac1 | 3770 | HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n", |
d6f6e0dc | 3771 | keydomain, dnslist_domain); |
8e669ac1 | 3772 | return OK; |
059ec3d9 | 3773 | } |
8e669ac1 | 3774 | |
c38d6da9 PH |
3775 | /* If the lookup deferred, remember this fact. We keep trying the rest |
3776 | of the list to see if we get a useful result, and if we don't, we return | |
3777 | DEFER at the end. */ | |
059ec3d9 | 3778 | |
c38d6da9 | 3779 | if (rc == DEFER) defer = TRUE; |
0bcb2a0e | 3780 | } /* continue with next keystring domain/address */ |
c38d6da9 PH |
3781 | |
3782 | if (defer) return DEFER; | |
8e669ac1 | 3783 | } |
0bcb2a0e | 3784 | } /* continue with next dnsdb outer domain */ |
059ec3d9 PH |
3785 | |
3786 | return FAIL; | |
3787 | } | |
3788 | ||
511a6c14 JH |
3789 | /* vi: aw ai sw=2 |
3790 | */ | |
059ec3d9 | 3791 | /* End of verify.c */ |