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93655c46 | 1 | /* $Cambridge: exim/src/src/verify.c,v 1.51 2007/06/14 14:18:19 ph10 Exp $ */ |
059ec3d9 PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
184e8823 | 7 | /* Copyright (c) University of Cambridge 1995 - 2007 */ |
059ec3d9 PH |
8 | /* See the file NOTICE for conditions of use and distribution. */ |
9 | ||
10 | /* Functions concerned with verifying things. The original code for callout | |
11 | caching was contributed by Kevin Fleming (but I hacked it around a bit). */ | |
12 | ||
13 | ||
14 | #include "exim.h" | |
15 | ||
16 | ||
17 | /* Structure for caching DNSBL lookups */ | |
18 | ||
19 | typedef struct dnsbl_cache_block { | |
20 | dns_address *rhs; | |
21 | uschar *text; | |
22 | int rc; | |
23 | BOOL text_set; | |
24 | } dnsbl_cache_block; | |
25 | ||
26 | ||
27 | /* Anchor for DNSBL cache */ | |
28 | ||
29 | static tree_node *dnsbl_cache = NULL; | |
30 | ||
31 | ||
431b7361 PH |
32 | /* Bits for match_type in one_check_dnsbl() */ |
33 | ||
34 | #define MT_NOT 1 | |
35 | #define MT_ALL 2 | |
36 | ||
37 | ||
059ec3d9 PH |
38 | |
39 | /************************************************* | |
40 | * Retrieve a callout cache record * | |
41 | *************************************************/ | |
42 | ||
43 | /* If a record exists, check whether it has expired. | |
44 | ||
45 | Arguments: | |
46 | dbm_file an open hints file | |
47 | key the record key | |
48 | type "address" or "domain" | |
49 | positive_expire expire time for positive records | |
50 | negative_expire expire time for negative records | |
51 | ||
52 | Returns: the cache record if a non-expired one exists, else NULL | |
53 | */ | |
54 | ||
55 | static dbdata_callout_cache * | |
56 | get_callout_cache_record(open_db *dbm_file, uschar *key, uschar *type, | |
57 | int positive_expire, int negative_expire) | |
58 | { | |
59 | BOOL negative; | |
60 | int length, expire; | |
61 | time_t now; | |
62 | dbdata_callout_cache *cache_record; | |
63 | ||
64 | cache_record = dbfn_read_with_length(dbm_file, key, &length); | |
65 | ||
66 | if (cache_record == NULL) | |
67 | { | |
68 | HDEBUG(D_verify) debug_printf("callout cache: no %s record found\n", type); | |
69 | return NULL; | |
70 | } | |
71 | ||
72 | /* We treat a record as "negative" if its result field is not positive, or if | |
73 | it is a domain record and the postmaster field is negative. */ | |
74 | ||
75 | negative = cache_record->result != ccache_accept || | |
76 | (type[0] == 'd' && cache_record->postmaster_result == ccache_reject); | |
77 | expire = negative? negative_expire : positive_expire; | |
78 | now = time(NULL); | |
79 | ||
80 | if (now - cache_record->time_stamp > expire) | |
81 | { | |
82 | HDEBUG(D_verify) debug_printf("callout cache: %s record expired\n", type); | |
83 | return NULL; | |
84 | } | |
85 | ||
86 | /* If this is a non-reject domain record, check for the obsolete format version | |
87 | that doesn't have the postmaster and random timestamps, by looking at the | |
88 | length. If so, copy it to a new-style block, replicating the record's | |
89 | timestamp. Then check the additional timestamps. (There's no point wasting | |
90 | effort if connections are rejected.) */ | |
91 | ||
92 | if (type[0] == 'd' && cache_record->result != ccache_reject) | |
93 | { | |
94 | if (length == sizeof(dbdata_callout_cache_obs)) | |
95 | { | |
96 | dbdata_callout_cache *new = store_get(sizeof(dbdata_callout_cache)); | |
97 | memcpy(new, cache_record, length); | |
98 | new->postmaster_stamp = new->random_stamp = new->time_stamp; | |
99 | cache_record = new; | |
100 | } | |
101 | ||
102 | if (now - cache_record->postmaster_stamp > expire) | |
103 | cache_record->postmaster_result = ccache_unknown; | |
104 | ||
105 | if (now - cache_record->random_stamp > expire) | |
106 | cache_record->random_result = ccache_unknown; | |
107 | } | |
108 | ||
109 | HDEBUG(D_verify) debug_printf("callout cache: found %s record\n", type); | |
110 | return cache_record; | |
111 | } | |
112 | ||
113 | ||
114 | ||
115 | /************************************************* | |
116 | * Do callout verification for an address * | |
117 | *************************************************/ | |
118 | ||
119 | /* This function is called from verify_address() when the address has routed to | |
120 | a host list, and a callout has been requested. Callouts are expensive; that is | |
121 | why a cache is used to improve the efficiency. | |
122 | ||
123 | Arguments: | |
124 | addr the address that's been routed | |
125 | host_list the list of hosts to try | |
126 | tf the transport feedback block | |
127 | ||
128 | ifstring "interface" option from transport, or NULL | |
129 | portstring "port" option from transport, or NULL | |
130 | protocolstring "protocol" option from transport, or NULL | |
131 | callout the per-command callout timeout | |
4deaf07d PH |
132 | callout_overall the overall callout timeout (if < 0 use 4*callout) |
133 | callout_connect the callout connection timeout (if < 0 use callout) | |
059ec3d9 PH |
134 | options the verification options - these bits are used: |
135 | vopt_is_recipient => this is a recipient address | |
136 | vopt_callout_no_cache => don't use callout cache | |
2a4be8f9 | 137 | vopt_callout_fullpm => if postmaster check, do full one |
059ec3d9 PH |
138 | vopt_callout_random => do the "random" thing |
139 | vopt_callout_recipsender => use real sender for recipient | |
140 | vopt_callout_recippmaster => use postmaster for recipient | |
141 | se_mailfrom MAIL FROM address for sender verify; NULL => "" | |
142 | pm_mailfrom if non-NULL, do the postmaster check with this sender | |
143 | ||
144 | Returns: OK/FAIL/DEFER | |
145 | */ | |
146 | ||
147 | static int | |
148 | do_callout(address_item *addr, host_item *host_list, transport_feedback *tf, | |
8e669ac1 | 149 | int callout, int callout_overall, int callout_connect, int options, |
4deaf07d | 150 | uschar *se_mailfrom, uschar *pm_mailfrom) |
059ec3d9 PH |
151 | { |
152 | BOOL is_recipient = (options & vopt_is_recipient) != 0; | |
153 | BOOL callout_no_cache = (options & vopt_callout_no_cache) != 0; | |
154 | BOOL callout_random = (options & vopt_callout_random) != 0; | |
155 | ||
156 | int yield = OK; | |
2b1c6e3a | 157 | int old_domain_cache_result = ccache_accept; |
059ec3d9 PH |
158 | BOOL done = FALSE; |
159 | uschar *address_key; | |
160 | uschar *from_address; | |
161 | uschar *random_local_part = NULL; | |
750af86e | 162 | uschar *save_deliver_domain = deliver_domain; |
8e669ac1 | 163 | uschar **failure_ptr = is_recipient? |
2c7db3f5 | 164 | &recipient_verify_failure : &sender_verify_failure; |
059ec3d9 PH |
165 | open_db dbblock; |
166 | open_db *dbm_file = NULL; | |
167 | dbdata_callout_cache new_domain_record; | |
168 | dbdata_callout_cache_address new_address_record; | |
169 | host_item *host; | |
170 | time_t callout_start_time; | |
171 | ||
172 | new_domain_record.result = ccache_unknown; | |
173 | new_domain_record.postmaster_result = ccache_unknown; | |
174 | new_domain_record.random_result = ccache_unknown; | |
175 | ||
176 | memset(&new_address_record, 0, sizeof(new_address_record)); | |
177 | ||
178 | /* For a recipient callout, the key used for the address cache record must | |
179 | include the sender address if we are using the real sender in the callout, | |
180 | because that may influence the result of the callout. */ | |
181 | ||
182 | address_key = addr->address; | |
183 | from_address = US""; | |
184 | ||
185 | if (is_recipient) | |
186 | { | |
187 | if ((options & vopt_callout_recipsender) != 0) | |
188 | { | |
189 | address_key = string_sprintf("%s/<%s>", addr->address, sender_address); | |
190 | from_address = sender_address; | |
191 | } | |
192 | else if ((options & vopt_callout_recippmaster) != 0) | |
193 | { | |
194 | address_key = string_sprintf("%s/<postmaster@%s>", addr->address, | |
195 | qualify_domain_sender); | |
196 | from_address = string_sprintf("postmaster@%s", qualify_domain_sender); | |
197 | } | |
198 | } | |
199 | ||
200 | /* For a sender callout, we must adjust the key if the mailfrom address is not | |
201 | empty. */ | |
202 | ||
203 | else | |
204 | { | |
205 | from_address = (se_mailfrom == NULL)? US"" : se_mailfrom; | |
206 | if (from_address[0] != 0) | |
207 | address_key = string_sprintf("%s/<%s>", addr->address, from_address); | |
208 | } | |
209 | ||
210 | /* Open the callout cache database, it it exists, for reading only at this | |
211 | stage, unless caching has been disabled. */ | |
212 | ||
213 | if (callout_no_cache) | |
214 | { | |
215 | HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n"); | |
216 | } | |
217 | else if ((dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE)) == NULL) | |
218 | { | |
219 | HDEBUG(D_verify) debug_printf("callout cache: not available\n"); | |
220 | } | |
221 | ||
222 | /* If a cache database is available see if we can avoid the need to do an | |
223 | actual callout by making use of previously-obtained data. */ | |
224 | ||
225 | if (dbm_file != NULL) | |
226 | { | |
227 | dbdata_callout_cache_address *cache_address_record; | |
228 | dbdata_callout_cache *cache_record = get_callout_cache_record(dbm_file, | |
229 | addr->domain, US"domain", | |
230 | callout_cache_domain_positive_expire, | |
231 | callout_cache_domain_negative_expire); | |
232 | ||
233 | /* If an unexpired cache record was found for this domain, see if the callout | |
234 | process can be short-circuited. */ | |
235 | ||
236 | if (cache_record != NULL) | |
237 | { | |
2b1c6e3a PH |
238 | /* In most cases, if an early command (up to and including MAIL FROM:<>) |
239 | was rejected, there is no point carrying on. The callout fails. However, if | |
240 | we are doing a recipient verification with use_sender or use_postmaster | |
241 | set, a previous failure of MAIL FROM:<> doesn't count, because this time we | |
242 | will be using a non-empty sender. We have to remember this situation so as | |
243 | not to disturb the cached domain value if this whole verification succeeds | |
244 | (we don't want it turning into "accept"). */ | |
245 | ||
246 | old_domain_cache_result = cache_record->result; | |
247 | ||
248 | if (cache_record->result == ccache_reject || | |
249 | (*from_address == 0 && cache_record->result == ccache_reject_mfnull)) | |
059ec3d9 PH |
250 | { |
251 | setflag(addr, af_verify_nsfail); | |
252 | HDEBUG(D_verify) | |
253 | debug_printf("callout cache: domain gave initial rejection, or " | |
254 | "does not accept HELO or MAIL FROM:<>\n"); | |
255 | setflag(addr, af_verify_nsfail); | |
256 | addr->user_message = US"(result of an earlier callout reused)."; | |
257 | yield = FAIL; | |
8e669ac1 | 258 | *failure_ptr = US"mail"; |
059ec3d9 PH |
259 | goto END_CALLOUT; |
260 | } | |
261 | ||
262 | /* If a previous check on a "random" local part was accepted, we assume | |
263 | that the server does not do any checking on local parts. There is therefore | |
264 | no point in doing the callout, because it will always be successful. If a | |
265 | random check previously failed, arrange not to do it again, but preserve | |
266 | the data in the new record. If a random check is required but hasn't been | |
267 | done, skip the remaining cache processing. */ | |
268 | ||
269 | if (callout_random) switch(cache_record->random_result) | |
270 | { | |
271 | case ccache_accept: | |
272 | HDEBUG(D_verify) | |
273 | debug_printf("callout cache: domain accepts random addresses\n"); | |
274 | goto END_CALLOUT; /* Default yield is OK */ | |
275 | ||
276 | case ccache_reject: | |
277 | HDEBUG(D_verify) | |
278 | debug_printf("callout cache: domain rejects random addresses\n"); | |
279 | callout_random = FALSE; | |
280 | new_domain_record.random_result = ccache_reject; | |
281 | new_domain_record.random_stamp = cache_record->random_stamp; | |
282 | break; | |
283 | ||
284 | default: | |
285 | HDEBUG(D_verify) | |
286 | debug_printf("callout cache: need to check random address handling " | |
287 | "(not cached or cache expired)\n"); | |
288 | goto END_CACHE; | |
289 | } | |
290 | ||
291 | /* If a postmaster check is requested, but there was a previous failure, | |
292 | there is again no point in carrying on. If a postmaster check is required, | |
293 | but has not been done before, we are going to have to do a callout, so skip | |
294 | remaining cache processing. */ | |
295 | ||
296 | if (pm_mailfrom != NULL) | |
297 | { | |
298 | if (cache_record->postmaster_result == ccache_reject) | |
299 | { | |
300 | setflag(addr, af_verify_pmfail); | |
301 | HDEBUG(D_verify) | |
302 | debug_printf("callout cache: domain does not accept " | |
303 | "RCPT TO:<postmaster@domain>\n"); | |
304 | yield = FAIL; | |
8e669ac1 | 305 | *failure_ptr = US"postmaster"; |
059ec3d9 PH |
306 | setflag(addr, af_verify_pmfail); |
307 | addr->user_message = US"(result of earlier verification reused)."; | |
308 | goto END_CALLOUT; | |
309 | } | |
310 | if (cache_record->postmaster_result == ccache_unknown) | |
311 | { | |
312 | HDEBUG(D_verify) | |
313 | debug_printf("callout cache: need to check RCPT " | |
314 | "TO:<postmaster@domain> (not cached or cache expired)\n"); | |
315 | goto END_CACHE; | |
316 | } | |
317 | ||
318 | /* If cache says OK, set pm_mailfrom NULL to prevent a redundant | |
319 | postmaster check if the address itself has to be checked. Also ensure | |
320 | that the value in the cache record is preserved (with its old timestamp). | |
321 | */ | |
322 | ||
323 | HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT " | |
324 | "TO:<postmaster@domain>\n"); | |
325 | pm_mailfrom = NULL; | |
326 | new_domain_record.postmaster_result = ccache_accept; | |
327 | new_domain_record.postmaster_stamp = cache_record->postmaster_stamp; | |
328 | } | |
329 | } | |
330 | ||
331 | /* We can't give a result based on information about the domain. See if there | |
332 | is an unexpired cache record for this specific address (combined with the | |
333 | sender address if we are doing a recipient callout with a non-empty sender). | |
334 | */ | |
335 | ||
336 | cache_address_record = (dbdata_callout_cache_address *) | |
337 | get_callout_cache_record(dbm_file, | |
338 | address_key, US"address", | |
339 | callout_cache_positive_expire, | |
340 | callout_cache_negative_expire); | |
341 | ||
342 | if (cache_address_record != NULL) | |
343 | { | |
344 | if (cache_address_record->result == ccache_accept) | |
345 | { | |
346 | HDEBUG(D_verify) | |
347 | debug_printf("callout cache: address record is positive\n"); | |
348 | } | |
349 | else | |
350 | { | |
351 | HDEBUG(D_verify) | |
352 | debug_printf("callout cache: address record is negative\n"); | |
353 | addr->user_message = US"Previous (cached) callout verification failure"; | |
8e669ac1 | 354 | *failure_ptr = US"recipient"; |
059ec3d9 PH |
355 | yield = FAIL; |
356 | } | |
357 | goto END_CALLOUT; | |
358 | } | |
359 | ||
360 | /* Close the cache database while we actually do the callout for real. */ | |
361 | ||
362 | END_CACHE: | |
363 | dbfn_close(dbm_file); | |
364 | dbm_file = NULL; | |
365 | } | |
366 | ||
367 | /* The information wasn't available in the cache, so we have to do a real | |
368 | callout and save the result in the cache for next time, unless no_cache is set, | |
369 | or unless we have a previously cached negative random result. If we are to test | |
370 | with a random local part, ensure that such a local part is available. If not, | |
371 | log the fact, but carry on without randomming. */ | |
372 | ||
373 | if (callout_random && callout_random_local_part != NULL) | |
374 | { | |
375 | random_local_part = expand_string(callout_random_local_part); | |
376 | if (random_local_part == NULL) | |
377 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand " | |
378 | "callout_random_local_part: %s", expand_string_message); | |
379 | } | |
380 | ||
4deaf07d PH |
381 | /* Default the connect and overall callout timeouts if not set, and record the |
382 | time we are starting so that we can enforce it. */ | |
059ec3d9 PH |
383 | |
384 | if (callout_overall < 0) callout_overall = 4 * callout; | |
4deaf07d | 385 | if (callout_connect < 0) callout_connect = callout; |
059ec3d9 PH |
386 | callout_start_time = time(NULL); |
387 | ||
4c590bd1 PH |
388 | /* Before doing a real callout, if this is an SMTP connection, flush the SMTP |
389 | output because a callout might take some time. When PIPELINING is active and | |
390 | there are many recipients, the total time for doing lots of callouts can add up | |
391 | and cause the client to time out. So in this case we forgo the PIPELINING | |
392 | optimization. */ | |
393 | ||
394 | if (smtp_out != NULL && !disable_callout_flush) mac_smtp_fflush(); | |
395 | ||
059ec3d9 PH |
396 | /* Now make connections to the hosts and do real callouts. The list of hosts |
397 | is passed in as an argument. */ | |
398 | ||
399 | for (host = host_list; host != NULL && !done; host = host->next) | |
400 | { | |
401 | smtp_inblock inblock; | |
402 | smtp_outblock outblock; | |
403 | int host_af; | |
404 | int port = 25; | |
8e669ac1 | 405 | BOOL send_quit = TRUE; |
26da7e20 | 406 | uschar *active_hostname = smtp_active_hostname; |
059ec3d9 PH |
407 | uschar *helo = US"HELO"; |
408 | uschar *interface = NULL; /* Outgoing interface to use; NULL => any */ | |
409 | uschar inbuffer[4096]; | |
410 | uschar outbuffer[1024]; | |
411 | uschar responsebuffer[4096]; | |
412 | ||
413 | clearflag(addr, af_verify_pmfail); /* postmaster callout flag */ | |
414 | clearflag(addr, af_verify_nsfail); /* null sender callout flag */ | |
415 | ||
416 | /* Skip this host if we don't have an IP address for it. */ | |
417 | ||
418 | if (host->address == NULL) | |
419 | { | |
420 | DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n", | |
421 | host->name); | |
422 | continue; | |
423 | } | |
424 | ||
425 | /* Check the overall callout timeout */ | |
426 | ||
427 | if (time(NULL) - callout_start_time >= callout_overall) | |
428 | { | |
429 | HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n"); | |
430 | break; | |
431 | } | |
432 | ||
433 | /* Set IPv4 or IPv6 */ | |
434 | ||
435 | host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6; | |
436 | ||
de3a88fb PH |
437 | /* Expand and interpret the interface and port strings. The latter will not |
438 | be used if there is a host-specific port (e.g. from a manualroute router). | |
439 | This has to be delayed till now, because they may expand differently for | |
440 | different hosts. If there's a failure, log it, but carry on with the | |
441 | defaults. */ | |
059ec3d9 PH |
442 | |
443 | deliver_host = host->name; | |
444 | deliver_host_address = host->address; | |
750af86e | 445 | deliver_domain = addr->domain; |
de3a88fb | 446 | |
059ec3d9 PH |
447 | if (!smtp_get_interface(tf->interface, host_af, addr, NULL, &interface, |
448 | US"callout") || | |
449 | !smtp_get_port(tf->port, addr, &port, US"callout")) | |
450 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address, | |
451 | addr->message); | |
de3a88fb | 452 | |
059ec3d9 PH |
453 | /* Set HELO string according to the protocol */ |
454 | ||
455 | if (Ustrcmp(tf->protocol, "lmtp") == 0) helo = US"LHLO"; | |
456 | ||
457 | HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port); | |
458 | ||
459 | /* Set up the buffer for reading SMTP response packets. */ | |
460 | ||
461 | inblock.buffer = inbuffer; | |
462 | inblock.buffersize = sizeof(inbuffer); | |
463 | inblock.ptr = inbuffer; | |
464 | inblock.ptrend = inbuffer; | |
465 | ||
466 | /* Set up the buffer for holding SMTP commands while pipelining */ | |
467 | ||
468 | outblock.buffer = outbuffer; | |
469 | outblock.buffersize = sizeof(outbuffer); | |
470 | outblock.ptr = outbuffer; | |
471 | outblock.cmd_count = 0; | |
472 | outblock.authenticating = FALSE; | |
473 | ||
474 | /* Connect to the host; on failure, just loop for the next one, but we | |
4deaf07d | 475 | set the error for the last one. Use the callout_connect timeout. */ |
059ec3d9 PH |
476 | |
477 | inblock.sock = outblock.sock = | |
4deaf07d | 478 | smtp_connect(host, host_af, port, interface, callout_connect, TRUE); |
059ec3d9 PH |
479 | if (inblock.sock < 0) |
480 | { | |
481 | addr->message = string_sprintf("could not connect to %s [%s]: %s", | |
482 | host->name, host->address, strerror(errno)); | |
41c7c167 PH |
483 | deliver_host = deliver_host_address = NULL; |
484 | deliver_domain = save_deliver_domain; | |
059ec3d9 PH |
485 | continue; |
486 | } | |
487 | ||
41c7c167 PH |
488 | /* Expand the helo_data string to find the host name to use. */ |
489 | ||
490 | if (tf->helo_data != NULL) | |
491 | { | |
492 | uschar *s = expand_string(tf->helo_data); | |
493 | if (s == NULL) | |
494 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: failed to expand transport's " | |
495 | "helo_data value for callout: %s", addr->address, | |
496 | expand_string_message); | |
497 | else active_hostname = s; | |
498 | } | |
499 | ||
500 | deliver_host = deliver_host_address = NULL; | |
501 | deliver_domain = save_deliver_domain; | |
502 | ||
2b1c6e3a PH |
503 | /* Wait for initial response, and send HELO. The smtp_write_command() |
504 | function leaves its command in big_buffer. This is used in error responses. | |
505 | Initialize it in case the connection is rejected. */ | |
059ec3d9 PH |
506 | |
507 | Ustrcpy(big_buffer, "initial connection"); | |
508 | ||
509 | done = | |
510 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), | |
511 | '2', callout) && | |
059ec3d9 | 512 | smtp_write_command(&outblock, FALSE, "%s %s\r\n", helo, |
26da7e20 | 513 | active_hostname) >= 0 && |
059ec3d9 | 514 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), |
2b1c6e3a | 515 | '2', callout); |
059ec3d9 | 516 | |
2b1c6e3a PH |
517 | /* Failure to accept HELO is cached; this blocks the whole domain for all |
518 | senders. I/O errors and defer responses are not cached. */ | |
519 | ||
520 | if (!done) | |
521 | { | |
522 | *failure_ptr = US"mail"; /* At or before MAIL */ | |
523 | if (errno == 0 && responsebuffer[0] == '5') | |
524 | { | |
525 | setflag(addr, af_verify_nsfail); | |
526 | new_domain_record.result = ccache_reject; | |
527 | } | |
528 | } | |
529 | ||
530 | /* Send the MAIL command */ | |
531 | ||
532 | else done = | |
059ec3d9 PH |
533 | smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n", |
534 | from_address) >= 0 && | |
535 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), | |
536 | '2', callout); | |
537 | ||
2b1c6e3a PH |
538 | /* If the host does not accept MAIL FROM:<>, arrange to cache this |
539 | information, but again, don't record anything for an I/O error or a defer. Do | |
540 | not cache rejections of MAIL when a non-empty sender has been used, because | |
541 | that blocks the whole domain for all senders. */ | |
059ec3d9 PH |
542 | |
543 | if (!done) | |
544 | { | |
2b1c6e3a | 545 | *failure_ptr = US"mail"; /* At or before MAIL */ |
059ec3d9 PH |
546 | if (errno == 0 && responsebuffer[0] == '5') |
547 | { | |
548 | setflag(addr, af_verify_nsfail); | |
2b1c6e3a PH |
549 | if (from_address[0] == 0) |
550 | new_domain_record.result = ccache_reject_mfnull; | |
059ec3d9 PH |
551 | } |
552 | } | |
553 | ||
554 | /* Otherwise, proceed to check a "random" address (if required), then the | |
555 | given address, and the postmaster address (if required). Between each check, | |
556 | issue RSET, because some servers accept only one recipient after MAIL | |
2b1c6e3a PH |
557 | FROM:<>. |
558 | ||
559 | Before doing this, set the result in the domain cache record to "accept", | |
560 | unless its previous value was ccache_reject_mfnull. In that case, the domain | |
561 | rejects MAIL FROM:<> and we want to continue to remember that. When that is | |
562 | the case, we have got here only in the case of a recipient verification with | |
563 | a non-null sender. */ | |
059ec3d9 PH |
564 | |
565 | else | |
566 | { | |
2b1c6e3a PH |
567 | new_domain_record.result = |
568 | (old_domain_cache_result == ccache_reject_mfnull)? | |
569 | ccache_reject_mfnull: ccache_accept; | |
059ec3d9 PH |
570 | |
571 | /* Do the random local part check first */ | |
572 | ||
573 | if (random_local_part != NULL) | |
574 | { | |
575 | uschar randombuffer[1024]; | |
576 | BOOL random_ok = | |
577 | smtp_write_command(&outblock, FALSE, | |
578 | "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part, | |
579 | addr->domain) >= 0 && | |
580 | smtp_read_response(&inblock, randombuffer, | |
581 | sizeof(randombuffer), '2', callout); | |
582 | ||
583 | /* Remember when we last did a random test */ | |
584 | ||
585 | new_domain_record.random_stamp = time(NULL); | |
586 | ||
587 | /* If accepted, we aren't going to do any further tests below. */ | |
588 | ||
589 | if (random_ok) | |
590 | { | |
591 | new_domain_record.random_result = ccache_accept; | |
592 | } | |
593 | ||
594 | /* Otherwise, cache a real negative response, and get back to the right | |
595 | state to send RCPT. Unless there's some problem such as a dropped | |
596 | connection, we expect to succeed, because the commands succeeded above. */ | |
597 | ||
598 | else if (errno == 0) | |
599 | { | |
600 | if (randombuffer[0] == '5') | |
601 | new_domain_record.random_result = ccache_reject; | |
602 | ||
603 | done = | |
604 | smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 && | |
605 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), | |
606 | '2', callout) && | |
607 | ||
90e9ce59 PH |
608 | smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n", |
609 | from_address) >= 0 && | |
059ec3d9 PH |
610 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), |
611 | '2', callout); | |
612 | } | |
613 | else done = FALSE; /* Some timeout/connection problem */ | |
614 | } /* Random check */ | |
615 | ||
616 | /* If the host is accepting all local parts, as determined by the "random" | |
617 | check, we don't need to waste time doing any further checking. */ | |
618 | ||
619 | if (new_domain_record.random_result != ccache_accept && done) | |
620 | { | |
5417f6d1 PH |
621 | /* Get the rcpt_include_affixes flag from the transport if there is one, |
622 | but assume FALSE if there is not. */ | |
623 | ||
059ec3d9 PH |
624 | done = |
625 | smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n", | |
c688b954 | 626 | transport_rcpt_address(addr, |
5417f6d1 PH |
627 | (addr->transport == NULL)? FALSE : |
628 | addr->transport->rcpt_include_affixes)) >= 0 && | |
059ec3d9 PH |
629 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), |
630 | '2', callout); | |
631 | ||
632 | if (done) | |
633 | new_address_record.result = ccache_accept; | |
634 | else if (errno == 0 && responsebuffer[0] == '5') | |
2c7db3f5 | 635 | { |
8e669ac1 | 636 | *failure_ptr = US"recipient"; |
059ec3d9 | 637 | new_address_record.result = ccache_reject; |
8e669ac1 | 638 | } |
059ec3d9 | 639 | |
2a4be8f9 PH |
640 | /* Do postmaster check if requested; if a full check is required, we |
641 | check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */ | |
059ec3d9 PH |
642 | |
643 | if (done && pm_mailfrom != NULL) | |
644 | { | |
645 | done = | |
646 | smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 && | |
647 | smtp_read_response(&inblock, responsebuffer, | |
648 | sizeof(responsebuffer), '2', callout) && | |
649 | ||
650 | smtp_write_command(&outblock, FALSE, | |
651 | "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 && | |
652 | smtp_read_response(&inblock, responsebuffer, | |
653 | sizeof(responsebuffer), '2', callout) && | |
654 | ||
2a4be8f9 PH |
655 | /* First try using the current domain */ |
656 | ||
657 | (( | |
059ec3d9 PH |
658 | smtp_write_command(&outblock, FALSE, |
659 | "RCPT TO:<postmaster@%.1000s>\r\n", addr->domain) >= 0 && | |
660 | smtp_read_response(&inblock, responsebuffer, | |
2a4be8f9 PH |
661 | sizeof(responsebuffer), '2', callout) |
662 | ) | |
663 | ||
664 | || | |
665 | ||
666 | /* If that doesn't work, and a full check is requested, | |
667 | try without the domain. */ | |
668 | ||
669 | ( | |
670 | (options & vopt_callout_fullpm) != 0 && | |
671 | smtp_write_command(&outblock, FALSE, | |
672 | "RCPT TO:<postmaster>\r\n") >= 0 && | |
673 | smtp_read_response(&inblock, responsebuffer, | |
674 | sizeof(responsebuffer), '2', callout) | |
675 | )); | |
676 | ||
677 | /* Sort out the cache record */ | |
059ec3d9 PH |
678 | |
679 | new_domain_record.postmaster_stamp = time(NULL); | |
680 | ||
681 | if (done) | |
682 | new_domain_record.postmaster_result = ccache_accept; | |
683 | else if (errno == 0 && responsebuffer[0] == '5') | |
684 | { | |
8e669ac1 | 685 | *failure_ptr = US"postmaster"; |
059ec3d9 PH |
686 | setflag(addr, af_verify_pmfail); |
687 | new_domain_record.postmaster_result = ccache_reject; | |
688 | } | |
689 | } | |
690 | } /* Random not accepted */ | |
90e9ce59 | 691 | } /* MAIL FROM: accepted */ |
059ec3d9 PH |
692 | |
693 | /* For any failure of the main check, other than a negative response, we just | |
694 | close the connection and carry on. We can identify a negative response by the | |
695 | fact that errno is zero. For I/O errors it will be non-zero | |
696 | ||
697 | Set up different error texts for logging and for sending back to the caller | |
698 | as an SMTP response. Log in all cases, using a one-line format. For sender | |
699 | callouts, give a full response to the caller, but for recipient callouts, | |
700 | don't give the IP address because this may be an internal host whose identity | |
701 | is not to be widely broadcast. */ | |
702 | ||
703 | if (!done) | |
704 | { | |
705 | if (errno == ETIMEDOUT) | |
706 | { | |
707 | HDEBUG(D_verify) debug_printf("SMTP timeout\n"); | |
8e669ac1 | 708 | send_quit = FALSE; |
059ec3d9 PH |
709 | } |
710 | else if (errno == 0) | |
711 | { | |
712 | if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped"); | |
713 | ||
714 | addr->message = | |
715 | string_sprintf("response to \"%s\" from %s [%s] was: %s", | |
716 | big_buffer, host->name, host->address, | |
717 | string_printing(responsebuffer)); | |
718 | ||
719 | addr->user_message = is_recipient? | |
720 | string_sprintf("Callout verification failed:\n%s", responsebuffer) | |
721 | : | |
722 | string_sprintf("Called: %s\nSent: %s\nResponse: %s", | |
723 | host->address, big_buffer, responsebuffer); | |
724 | ||
725 | /* Hard rejection ends the process */ | |
726 | ||
727 | if (responsebuffer[0] == '5') /* Address rejected */ | |
728 | { | |
729 | yield = FAIL; | |
730 | done = TRUE; | |
731 | } | |
732 | } | |
733 | } | |
734 | ||
735 | /* End the SMTP conversation and close the connection. */ | |
736 | ||
c9bdd01c | 737 | if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); |
f1e894f3 | 738 | (void)close(inblock.sock); |
059ec3d9 PH |
739 | } /* Loop through all hosts, while !done */ |
740 | ||
741 | /* If we get here with done == TRUE, a successful callout happened, and yield | |
742 | will be set OK or FAIL according to the response to the RCPT command. | |
743 | Otherwise, we looped through the hosts but couldn't complete the business. | |
744 | However, there may be domain-specific information to cache in both cases. | |
745 | ||
746 | The value of the result field in the new_domain record is ccache_unknown if | |
90e9ce59 | 747 | there was an error before or with MAIL FROM:, and errno was not zero, |
059ec3d9 | 748 | implying some kind of I/O error. We don't want to write the cache in that case. |
2b1c6e3a | 749 | Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */ |
059ec3d9 PH |
750 | |
751 | if (!callout_no_cache && new_domain_record.result != ccache_unknown) | |
752 | { | |
753 | if ((dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE)) | |
754 | == NULL) | |
755 | { | |
756 | HDEBUG(D_verify) debug_printf("callout cache: not available\n"); | |
757 | } | |
758 | else | |
759 | { | |
760 | (void)dbfn_write(dbm_file, addr->domain, &new_domain_record, | |
761 | (int)sizeof(dbdata_callout_cache)); | |
762 | HDEBUG(D_verify) debug_printf("wrote callout cache domain record:\n" | |
763 | " result=%d postmaster=%d random=%d\n", | |
764 | new_domain_record.result, | |
765 | new_domain_record.postmaster_result, | |
766 | new_domain_record.random_result); | |
767 | } | |
768 | } | |
769 | ||
770 | /* If a definite result was obtained for the callout, cache it unless caching | |
771 | is disabled. */ | |
772 | ||
773 | if (done) | |
774 | { | |
775 | if (!callout_no_cache && new_address_record.result != ccache_unknown) | |
776 | { | |
777 | if (dbm_file == NULL) | |
778 | dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE); | |
779 | if (dbm_file == NULL) | |
780 | { | |
781 | HDEBUG(D_verify) debug_printf("no callout cache available\n"); | |
782 | } | |
783 | else | |
784 | { | |
785 | (void)dbfn_write(dbm_file, address_key, &new_address_record, | |
786 | (int)sizeof(dbdata_callout_cache_address)); | |
787 | HDEBUG(D_verify) debug_printf("wrote %s callout cache address record\n", | |
788 | (new_address_record.result == ccache_accept)? "positive" : "negative"); | |
789 | } | |
790 | } | |
791 | } /* done */ | |
792 | ||
793 | /* Failure to connect to any host, or any response other than 2xx or 5xx is a | |
794 | temporary error. If there was only one host, and a response was received, leave | |
795 | it alone if supplying details. Otherwise, give a generic response. */ | |
796 | ||
797 | else /* !done */ | |
798 | { | |
799 | uschar *dullmsg = string_sprintf("Could not complete %s verify callout", | |
800 | is_recipient? "recipient" : "sender"); | |
801 | yield = DEFER; | |
802 | ||
803 | if (host_list->next != NULL || addr->message == NULL) addr->message = dullmsg; | |
804 | ||
805 | addr->user_message = (!smtp_return_error_details)? dullmsg : | |
806 | string_sprintf("%s for <%s>.\n" | |
807 | "The mail server(s) for the domain may be temporarily unreachable, or\n" | |
808 | "they may be permanently unreachable from this server. In the latter case,\n%s", | |
809 | dullmsg, addr->address, | |
810 | is_recipient? | |
811 | "the address will never be accepted." | |
812 | : | |
813 | "you need to change the address or create an MX record for its domain\n" | |
814 | "if it is supposed to be generally accessible from the Internet.\n" | |
815 | "Talk to your mail administrator for details."); | |
816 | ||
817 | /* Force a specific error code */ | |
818 | ||
819 | addr->basic_errno = ERRNO_CALLOUTDEFER; | |
820 | } | |
821 | ||
822 | /* Come here from within the cache-reading code on fast-track exit. */ | |
823 | ||
824 | END_CALLOUT: | |
825 | if (dbm_file != NULL) dbfn_close(dbm_file); | |
826 | return yield; | |
827 | } | |
828 | ||
829 | ||
830 | ||
831 | /************************************************* | |
832 | * Copy error to toplevel address * | |
833 | *************************************************/ | |
834 | ||
835 | /* This function is used when a verify fails or defers, to ensure that the | |
836 | failure or defer information is in the original toplevel address. This applies | |
837 | when an address is redirected to a single new address, and the failure or | |
838 | deferral happens to the child address. | |
839 | ||
840 | Arguments: | |
841 | vaddr the verify address item | |
842 | addr the final address item | |
843 | yield FAIL or DEFER | |
844 | ||
845 | Returns: the value of YIELD | |
846 | */ | |
847 | ||
848 | static int | |
849 | copy_error(address_item *vaddr, address_item *addr, int yield) | |
850 | { | |
851 | if (addr != vaddr) | |
852 | { | |
853 | vaddr->message = addr->message; | |
854 | vaddr->user_message = addr->user_message; | |
855 | vaddr->basic_errno = addr->basic_errno; | |
856 | vaddr->more_errno = addr->more_errno; | |
b37c4101 | 857 | vaddr->p.address_data = addr->p.address_data; |
42855d71 | 858 | copyflag(vaddr, addr, af_pass_message); |
059ec3d9 PH |
859 | } |
860 | return yield; | |
861 | } | |
862 | ||
863 | ||
864 | ||
865 | ||
866 | /************************************************* | |
867 | * Verify an email address * | |
868 | *************************************************/ | |
869 | ||
870 | /* This function is used both for verification (-bv and at other times) and | |
871 | address testing (-bt), which is indicated by address_test_mode being set. | |
872 | ||
873 | Arguments: | |
874 | vaddr contains the address to verify; the next field in this block | |
875 | must be NULL | |
876 | f if not NULL, write the result to this file | |
877 | options various option bits: | |
878 | vopt_fake_sender => this sender verify is not for the real | |
879 | sender (it was verify=sender=xxxx or an address from a | |
880 | header line) - rewriting must not change sender_address | |
881 | vopt_is_recipient => this is a recipient address, otherwise | |
882 | it's a sender address - this affects qualification and | |
883 | rewriting and messages from callouts | |
884 | vopt_qualify => qualify an unqualified address; else error | |
885 | vopt_expn => called from SMTP EXPN command | |
eafd343b TK |
886 | vopt_success_on_redirect => when a new address is generated |
887 | the verification instantly succeeds | |
059ec3d9 PH |
888 | |
889 | These ones are used by do_callout() -- the options variable | |
890 | is passed to it. | |
891 | ||
2a4be8f9 | 892 | vopt_callout_fullpm => if postmaster check, do full one |
059ec3d9 PH |
893 | vopt_callout_no_cache => don't use callout cache |
894 | vopt_callout_random => do the "random" thing | |
895 | vopt_callout_recipsender => use real sender for recipient | |
896 | vopt_callout_recippmaster => use postmaster for recipient | |
897 | ||
898 | callout if > 0, specifies that callout is required, and gives timeout | |
4deaf07d | 899 | for individual commands |
059ec3d9 PH |
900 | callout_overall if > 0, gives overall timeout for the callout function; |
901 | if < 0, a default is used (see do_callout()) | |
8e669ac1 | 902 | callout_connect the connection timeout for callouts |
059ec3d9 PH |
903 | se_mailfrom when callout is requested to verify a sender, use this |
904 | in MAIL FROM; NULL => "" | |
905 | pm_mailfrom when callout is requested, if non-NULL, do the postmaster | |
906 | thing and use this as the sender address (may be "") | |
907 | ||
908 | routed if not NULL, set TRUE if routing succeeded, so we can | |
909 | distinguish between routing failed and callout failed | |
910 | ||
911 | Returns: OK address verified | |
912 | FAIL address failed to verify | |
913 | DEFER can't tell at present | |
914 | */ | |
915 | ||
916 | int | |
917 | verify_address(address_item *vaddr, FILE *f, int options, int callout, | |
8e669ac1 | 918 | int callout_overall, int callout_connect, uschar *se_mailfrom, |
4deaf07d | 919 | uschar *pm_mailfrom, BOOL *routed) |
059ec3d9 PH |
920 | { |
921 | BOOL allok = TRUE; | |
922 | BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0); | |
923 | BOOL is_recipient = (options & vopt_is_recipient) != 0; | |
924 | BOOL expn = (options & vopt_expn) != 0; | |
eafd343b | 925 | BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0; |
059ec3d9 PH |
926 | int i; |
927 | int yield = OK; | |
928 | int verify_type = expn? v_expn : | |
929 | address_test_mode? v_none : | |
930 | is_recipient? v_recipient : v_sender; | |
931 | address_item *addr_list; | |
932 | address_item *addr_new = NULL; | |
933 | address_item *addr_remote = NULL; | |
934 | address_item *addr_local = NULL; | |
935 | address_item *addr_succeed = NULL; | |
8e669ac1 | 936 | uschar **failure_ptr = is_recipient? |
2c7db3f5 | 937 | &recipient_verify_failure : &sender_verify_failure; |
059ec3d9 PH |
938 | uschar *ko_prefix, *cr; |
939 | uschar *address = vaddr->address; | |
940 | uschar *save_sender; | |
941 | uschar null_sender[] = { 0 }; /* Ensure writeable memory */ | |
942 | ||
2c7db3f5 PH |
943 | /* Clear, just in case */ |
944 | ||
945 | *failure_ptr = NULL; | |
946 | ||
059ec3d9 PH |
947 | /* Set up a prefix and suffix for error message which allow us to use the same |
948 | output statements both in EXPN mode (where an SMTP response is needed) and when | |
949 | debugging with an output file. */ | |
950 | ||
951 | if (expn) | |
952 | { | |
953 | ko_prefix = US"553 "; | |
954 | cr = US"\r"; | |
955 | } | |
956 | else ko_prefix = cr = US""; | |
957 | ||
958 | /* Add qualify domain if permitted; otherwise an unqualified address fails. */ | |
959 | ||
960 | if (parse_find_at(address) == NULL) | |
961 | { | |
962 | if ((options & vopt_qualify) == 0) | |
963 | { | |
964 | if (f != NULL) | |
965 | fprintf(f, "%sA domain is required for \"%s\"%s\n", ko_prefix, address, | |
966 | cr); | |
8e669ac1 | 967 | *failure_ptr = US"qualify"; |
059ec3d9 PH |
968 | return FAIL; |
969 | } | |
970 | address = rewrite_address_qualify(address, is_recipient); | |
971 | } | |
972 | ||
973 | DEBUG(D_verify) | |
974 | { | |
975 | debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
976 | debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address); | |
977 | } | |
978 | ||
979 | /* Rewrite and report on it. Clear the domain and local part caches - these | |
980 | may have been set by domains and local part tests during an ACL. */ | |
981 | ||
982 | if (global_rewrite_rules != NULL) | |
983 | { | |
984 | uschar *old = address; | |
985 | address = rewrite_address(address, is_recipient, FALSE, | |
986 | global_rewrite_rules, rewrite_existflags); | |
987 | if (address != old) | |
988 | { | |
989 | for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0; | |
990 | for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0; | |
991 | if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address); | |
992 | } | |
993 | } | |
994 | ||
995 | /* If this is the real sender address, we must update sender_address at | |
996 | this point, because it may be referred to in the routers. */ | |
997 | ||
998 | if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0) | |
999 | sender_address = address; | |
1000 | ||
1001 | /* If the address was rewritten to <> no verification can be done, and we have | |
1002 | to return OK. This rewriting is permitted only for sender addresses; for other | |
1003 | addresses, such rewriting fails. */ | |
1004 | ||
1005 | if (address[0] == 0) return OK; | |
1006 | ||
1007 | /* Save a copy of the sender address for re-instating if we change it to <> | |
1008 | while verifying a sender address (a nice bit of self-reference there). */ | |
1009 | ||
1010 | save_sender = sender_address; | |
1011 | ||
1012 | /* Update the address structure with the possibly qualified and rewritten | |
1013 | address. Set it up as the starting address on the chain of new addresses. */ | |
1014 | ||
1015 | vaddr->address = address; | |
1016 | addr_new = vaddr; | |
1017 | ||
1018 | /* We need a loop, because an address can generate new addresses. We must also | |
1019 | cope with generated pipes and files at the top level. (See also the code and | |
1020 | comment in deliver.c.) However, it is usually the case that the router for | |
1021 | user's .forward files has its verify flag turned off. | |
1022 | ||
1023 | If an address generates more than one child, the loop is used only when | |
1024 | full_info is set, and this can only be set locally. Remote enquiries just get | |
1025 | information about the top level address, not anything that it generated. */ | |
1026 | ||
1027 | while (addr_new != NULL) | |
1028 | { | |
1029 | int rc; | |
1030 | address_item *addr = addr_new; | |
1031 | ||
1032 | addr_new = addr->next; | |
1033 | addr->next = NULL; | |
1034 | ||
1035 | DEBUG(D_verify) | |
1036 | { | |
1037 | debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1038 | debug_printf("Considering %s\n", addr->address); | |
1039 | } | |
1040 | ||
1041 | /* Handle generated pipe, file or reply addresses. We don't get these | |
1042 | when handling EXPN, as it does only one level of expansion. */ | |
1043 | ||
1044 | if (testflag(addr, af_pfr)) | |
1045 | { | |
1046 | allok = FALSE; | |
1047 | if (f != NULL) | |
1048 | { | |
1049 | BOOL allow; | |
1050 | ||
1051 | if (addr->address[0] == '>') | |
1052 | { | |
1053 | allow = testflag(addr, af_allow_reply); | |
1054 | fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1); | |
1055 | } | |
1056 | else | |
1057 | { | |
1058 | allow = (addr->address[0] == '|')? | |
1059 | testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file); | |
1060 | fprintf(f, "%s -> %s", addr->parent->address, addr->address); | |
1061 | } | |
1062 | ||
1063 | if (addr->basic_errno == ERRNO_BADTRANSPORT) | |
1064 | fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n" | |
1065 | "%s\n", addr->message); | |
1066 | else if (allow) | |
1067 | fprintf(f, "\n transport = %s\n", addr->transport->name); | |
1068 | else | |
1069 | fprintf(f, " *** forbidden ***\n"); | |
1070 | } | |
1071 | continue; | |
1072 | } | |
1073 | ||
1074 | /* Just in case some router parameter refers to it. */ | |
1075 | ||
1076 | return_path = (addr->p.errors_address != NULL)? | |
1077 | addr->p.errors_address : sender_address; | |
1078 | ||
1079 | /* Split the address into domain and local part, handling the %-hack if | |
1080 | necessary, and then route it. While routing a sender address, set | |
1081 | $sender_address to <> because that is what it will be if we were trying to | |
1082 | send a bounce to the sender. */ | |
1083 | ||
1084 | if (routed != NULL) *routed = FALSE; | |
1085 | if ((rc = deliver_split_address(addr)) == OK) | |
1086 | { | |
1087 | if (!is_recipient) sender_address = null_sender; | |
1088 | rc = route_address(addr, &addr_local, &addr_remote, &addr_new, | |
1089 | &addr_succeed, verify_type); | |
1090 | sender_address = save_sender; /* Put back the real sender */ | |
1091 | } | |
1092 | ||
1093 | /* If routing an address succeeded, set the flag that remembers, for use when | |
1094 | an ACL cached a sender verify (in case a callout fails). Then if routing set | |
1095 | up a list of hosts or the transport has a host list, and the callout option | |
1096 | is set, and we aren't in a host checking run, do the callout verification, | |
1097 | and set another flag that notes that a callout happened. */ | |
1098 | ||
1099 | if (rc == OK) | |
1100 | { | |
1101 | if (routed != NULL) *routed = TRUE; | |
1102 | if (callout > 0) | |
1103 | { | |
1104 | host_item *host_list = addr->host_list; | |
1105 | ||
26da7e20 PH |
1106 | /* Make up some data for use in the case where there is no remote |
1107 | transport. */ | |
1108 | ||
1109 | transport_feedback tf = { | |
1110 | NULL, /* interface (=> any) */ | |
1111 | US"smtp", /* port */ | |
1112 | US"smtp", /* protocol */ | |
1113 | NULL, /* hosts */ | |
1114 | US"$smtp_active_hostname", /* helo_data */ | |
1115 | FALSE, /* hosts_override */ | |
1116 | FALSE, /* hosts_randomize */ | |
1117 | FALSE, /* gethostbyname */ | |
1118 | TRUE, /* qualify_single */ | |
1119 | FALSE /* search_parents */ | |
1120 | }; | |
059ec3d9 PH |
1121 | |
1122 | /* If verification yielded a remote transport, we want to use that | |
1123 | transport's options, so as to mimic what would happen if we were really | |
1124 | sending a message to this address. */ | |
1125 | ||
1126 | if (addr->transport != NULL && !addr->transport->info->local) | |
1127 | { | |
929ba01c | 1128 | (void)(addr->transport->setup)(addr->transport, addr, &tf, 0, 0, NULL); |
059ec3d9 PH |
1129 | |
1130 | /* If the transport has hosts and the router does not, or if the | |
1131 | transport is configured to override the router's hosts, we must build a | |
1132 | host list of the transport's hosts, and find the IP addresses */ | |
1133 | ||
1134 | if (tf.hosts != NULL && (host_list == NULL || tf.hosts_override)) | |
1135 | { | |
1136 | uschar *s; | |
750af86e PH |
1137 | uschar *save_deliver_domain = deliver_domain; |
1138 | uschar *save_deliver_localpart = deliver_localpart; | |
059ec3d9 PH |
1139 | |
1140 | host_list = NULL; /* Ignore the router's hosts */ | |
1141 | ||
1142 | deliver_domain = addr->domain; | |
1143 | deliver_localpart = addr->local_part; | |
1144 | s = expand_string(tf.hosts); | |
750af86e PH |
1145 | deliver_domain = save_deliver_domain; |
1146 | deliver_localpart = save_deliver_localpart; | |
059ec3d9 PH |
1147 | |
1148 | if (s == NULL) | |
1149 | { | |
1150 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts " | |
1151 | "\"%s\" in %s transport for callout: %s", tf.hosts, | |
1152 | addr->transport->name, expand_string_message); | |
1153 | } | |
1154 | else | |
1155 | { | |
322050c2 | 1156 | int flags; |
059ec3d9 | 1157 | uschar *canonical_name; |
d8ef3577 | 1158 | host_item *host, *nexthost; |
059ec3d9 PH |
1159 | host_build_hostlist(&host_list, s, tf.hosts_randomize); |
1160 | ||
1161 | /* Just ignore failures to find a host address. If we don't manage | |
8e669ac1 PH |
1162 | to find any addresses, the callout will defer. Note that more than |
1163 | one address may be found for a single host, which will result in | |
1164 | additional host items being inserted into the chain. Hence we must | |
d8ef3577 | 1165 | save the next host first. */ |
059ec3d9 | 1166 | |
322050c2 PH |
1167 | flags = HOST_FIND_BY_A; |
1168 | if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; | |
1169 | if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS; | |
1170 | ||
d8ef3577 | 1171 | for (host = host_list; host != NULL; host = nexthost) |
059ec3d9 | 1172 | { |
d8ef3577 | 1173 | nexthost = host->next; |
8e669ac1 | 1174 | if (tf.gethostbyname || |
7e66e54d | 1175 | string_is_ip_address(host->name, NULL) != 0) |
322050c2 | 1176 | (void)host_find_byname(host, NULL, flags, &canonical_name, TRUE); |
059ec3d9 | 1177 | else |
059ec3d9 PH |
1178 | (void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
1179 | &canonical_name, NULL); | |
059ec3d9 PH |
1180 | } |
1181 | } | |
1182 | } | |
1183 | } | |
1184 | ||
8e669ac1 | 1185 | /* Can only do a callout if we have at least one host! If the callout |
2c7db3f5 | 1186 | fails, it will have set ${sender,recipient}_verify_failure. */ |
059ec3d9 PH |
1187 | |
1188 | if (host_list != NULL) | |
1189 | { | |
1190 | HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n"); | |
1191 | if (host_checking && !host_checking_callout) | |
1192 | { | |
1193 | HDEBUG(D_verify) | |
1194 | debug_printf("... callout omitted by default when host testing\n" | |
1195 | "(Use -bhc if you want the callouts to happen.)\n"); | |
1196 | } | |
1197 | else | |
1198 | { | |
1199 | rc = do_callout(addr, host_list, &tf, callout, callout_overall, | |
4deaf07d | 1200 | callout_connect, options, se_mailfrom, pm_mailfrom); |
059ec3d9 PH |
1201 | } |
1202 | } | |
1203 | else | |
1204 | { | |
1205 | HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor " | |
1206 | "transport provided a host list\n"); | |
1207 | } | |
1208 | } | |
1209 | } | |
8e669ac1 | 1210 | |
2c7db3f5 | 1211 | /* Otherwise, any failure is a routing failure */ |
8e669ac1 PH |
1212 | |
1213 | else *failure_ptr = US"route"; | |
059ec3d9 PH |
1214 | |
1215 | /* A router may return REROUTED if it has set up a child address as a result | |
1216 | of a change of domain name (typically from widening). In this case we always | |
1217 | want to continue to verify the new child. */ | |
1218 | ||
1219 | if (rc == REROUTED) continue; | |
8e669ac1 | 1220 | |
059ec3d9 PH |
1221 | /* Handle hard failures */ |
1222 | ||
1223 | if (rc == FAIL) | |
1224 | { | |
1225 | allok = FALSE; | |
1226 | if (f != NULL) | |
1227 | { | |
e6f6568e PH |
1228 | address_item *p = addr->parent; |
1229 | ||
322050c2 | 1230 | fprintf(f, "%s%s %s", ko_prefix, full_info? addr->address : address, |
059ec3d9 PH |
1231 | address_test_mode? "is undeliverable" : "failed to verify"); |
1232 | if (!expn && admin_user) | |
1233 | { | |
1234 | if (addr->basic_errno > 0) | |
1235 | fprintf(f, ": %s", strerror(addr->basic_errno)); | |
1236 | if (addr->message != NULL) | |
e6f6568e PH |
1237 | fprintf(f, ": %s", addr->message); |
1238 | } | |
1239 | ||
1240 | /* Show parents iff doing full info */ | |
1241 | ||
1242 | if (full_info) while (p != NULL) | |
1243 | { | |
1244 | fprintf(f, "%s\n <-- %s", cr, p->address); | |
1245 | p = p->parent; | |
059ec3d9 PH |
1246 | } |
1247 | fprintf(f, "%s\n", cr); | |
1248 | } | |
1249 | ||
1250 | if (!full_info) return copy_error(vaddr, addr, FAIL); | |
1251 | else yield = FAIL; | |
1252 | } | |
1253 | ||
1254 | /* Soft failure */ | |
1255 | ||
1256 | else if (rc == DEFER) | |
1257 | { | |
1258 | allok = FALSE; | |
1259 | if (f != NULL) | |
1260 | { | |
e6f6568e PH |
1261 | address_item *p = addr->parent; |
1262 | fprintf(f, "%s%s cannot be resolved at this time", ko_prefix, | |
322050c2 | 1263 | full_info? addr->address : address); |
059ec3d9 PH |
1264 | if (!expn && admin_user) |
1265 | { | |
1266 | if (addr->basic_errno > 0) | |
e6f6568e | 1267 | fprintf(f, ": %s", strerror(addr->basic_errno)); |
059ec3d9 | 1268 | if (addr->message != NULL) |
e6f6568e | 1269 | fprintf(f, ": %s", addr->message); |
059ec3d9 | 1270 | else if (addr->basic_errno <= 0) |
e6f6568e | 1271 | fprintf(f, ": unknown error"); |
059ec3d9 PH |
1272 | } |
1273 | ||
e6f6568e PH |
1274 | /* Show parents iff doing full info */ |
1275 | ||
1276 | if (full_info) while (p != NULL) | |
1277 | { | |
1278 | fprintf(f, "%s\n <-- %s", cr, p->address); | |
1279 | p = p->parent; | |
1280 | } | |
059ec3d9 PH |
1281 | fprintf(f, "%s\n", cr); |
1282 | } | |
1283 | if (!full_info) return copy_error(vaddr, addr, DEFER); | |
1284 | else if (yield == OK) yield = DEFER; | |
1285 | } | |
1286 | ||
1287 | /* If we are handling EXPN, we do not want to continue to route beyond | |
e6f6568e | 1288 | the top level (whose address is in "address"). */ |
059ec3d9 PH |
1289 | |
1290 | else if (expn) | |
1291 | { | |
1292 | uschar *ok_prefix = US"250-"; | |
1293 | if (addr_new == NULL) | |
1294 | { | |
1295 | if (addr_local == NULL && addr_remote == NULL) | |
1296 | fprintf(f, "250 mail to <%s> is discarded\r\n", address); | |
1297 | else | |
1298 | fprintf(f, "250 <%s>\r\n", address); | |
1299 | } | |
1300 | else while (addr_new != NULL) | |
1301 | { | |
1302 | address_item *addr2 = addr_new; | |
1303 | addr_new = addr2->next; | |
1304 | if (addr_new == NULL) ok_prefix = US"250 "; | |
1305 | fprintf(f, "%s<%s>\r\n", ok_prefix, addr2->address); | |
1306 | } | |
1307 | return OK; | |
1308 | } | |
1309 | ||
1310 | /* Successful routing other than EXPN. */ | |
1311 | ||
1312 | else | |
1313 | { | |
1314 | /* Handle successful routing when short info wanted. Otherwise continue for | |
1315 | other (generated) addresses. Short info is the operational case. Full info | |
1316 | can be requested only when debug_selector != 0 and a file is supplied. | |
1317 | ||
1318 | There is a conflict between the use of aliasing as an alternate email | |
1319 | address, and as a sort of mailing list. If an alias turns the incoming | |
1320 | address into just one address (e.g. J.Caesar->jc44) you may well want to | |
1321 | carry on verifying the generated address to ensure it is valid when | |
1322 | checking incoming mail. If aliasing generates multiple addresses, you | |
1323 | probably don't want to do this. Exim therefore treats the generation of | |
1324 | just a single new address as a special case, and continues on to verify the | |
1325 | generated address. */ | |
1326 | ||
1327 | if (!full_info && /* Stop if short info wanted AND */ | |
eafd343b TK |
1328 | (((addr_new == NULL || /* No new address OR */ |
1329 | addr_new->next != NULL || /* More than one new address OR */ | |
1330 | testflag(addr_new, af_pfr))) /* New address is pfr */ | |
1331 | || /* OR */ | |
1332 | (addr_new != NULL && /* At least one new address AND */ | |
1333 | success_on_redirect))) /* success_on_redirect is set */ | |
059ec3d9 | 1334 | { |
322050c2 | 1335 | if (f != NULL) fprintf(f, "%s %s\n", address, |
059ec3d9 PH |
1336 | address_test_mode? "is deliverable" : "verified"); |
1337 | ||
1338 | /* If we have carried on to verify a child address, we want the value | |
1339 | of $address_data to be that of the child */ | |
1340 | ||
1341 | vaddr->p.address_data = addr->p.address_data; | |
1342 | return OK; | |
1343 | } | |
1344 | } | |
1345 | } /* Loop for generated addresses */ | |
1346 | ||
1347 | /* Display the full results of the successful routing, including any generated | |
1348 | addresses. Control gets here only when full_info is set, which requires f not | |
1349 | to be NULL, and this occurs only when a top-level verify is called with the | |
1350 | debugging switch on. | |
1351 | ||
1352 | If there are no local and no remote addresses, and there were no pipes, files, | |
1353 | or autoreplies, and there were no errors or deferments, the message is to be | |
1354 | discarded, usually because of the use of :blackhole: in an alias file. */ | |
1355 | ||
1356 | if (allok && addr_local == NULL && addr_remote == NULL) | |
dbcef0ea | 1357 | { |
059ec3d9 | 1358 | fprintf(f, "mail to %s is discarded\n", address); |
dbcef0ea PH |
1359 | return yield; |
1360 | } | |
059ec3d9 | 1361 | |
dbcef0ea | 1362 | for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++) |
059ec3d9 PH |
1363 | { |
1364 | while (addr_list != NULL) | |
1365 | { | |
1366 | address_item *addr = addr_list; | |
1367 | address_item *p = addr->parent; | |
1368 | addr_list = addr->next; | |
1369 | ||
1370 | fprintf(f, "%s", CS addr->address); | |
384152a6 TK |
1371 | #ifdef EXPERIMENTAL_SRS |
1372 | if(addr->p.srs_sender) | |
1373 | fprintf(f, " [srs = %s]", addr->p.srs_sender); | |
1374 | #endif | |
dbcef0ea PH |
1375 | |
1376 | /* If the address is a duplicate, show something about it. */ | |
1377 | ||
1378 | if (!testflag(addr, af_pfr)) | |
1379 | { | |
1380 | tree_node *tnode; | |
1381 | if ((tnode = tree_search(tree_duplicates, addr->unique)) != NULL) | |
1382 | fprintf(f, " [duplicate, would not be delivered]"); | |
1383 | else tree_add_duplicate(addr->unique, addr); | |
1384 | } | |
1385 | ||
1386 | /* Now show its parents */ | |
1387 | ||
059ec3d9 PH |
1388 | while (p != NULL) |
1389 | { | |
1390 | fprintf(f, "\n <-- %s", p->address); | |
1391 | p = p->parent; | |
1392 | } | |
1393 | fprintf(f, "\n "); | |
1394 | ||
1395 | /* Show router, and transport */ | |
1396 | ||
1397 | fprintf(f, "router = %s, ", addr->router->name); | |
1398 | fprintf(f, "transport = %s\n", (addr->transport == NULL)? US"unset" : | |
1399 | addr->transport->name); | |
1400 | ||
1401 | /* Show any hosts that are set up by a router unless the transport | |
1402 | is going to override them; fiddle a bit to get a nice format. */ | |
1403 | ||
1404 | if (addr->host_list != NULL && addr->transport != NULL && | |
1405 | !addr->transport->overrides_hosts) | |
1406 | { | |
1407 | host_item *h; | |
1408 | int maxlen = 0; | |
1409 | int maxaddlen = 0; | |
1410 | for (h = addr->host_list; h != NULL; h = h->next) | |
1411 | { | |
1412 | int len = Ustrlen(h->name); | |
1413 | if (len > maxlen) maxlen = len; | |
1414 | len = (h->address != NULL)? Ustrlen(h->address) : 7; | |
1415 | if (len > maxaddlen) maxaddlen = len; | |
1416 | } | |
1417 | for (h = addr->host_list; h != NULL; h = h->next) | |
1418 | { | |
1419 | int len = Ustrlen(h->name); | |
1420 | fprintf(f, " host %s ", h->name); | |
1421 | while (len++ < maxlen) fprintf(f, " "); | |
1422 | if (h->address != NULL) | |
1423 | { | |
1424 | fprintf(f, "[%s] ", h->address); | |
1425 | len = Ustrlen(h->address); | |
1426 | } | |
1427 | else if (!addr->transport->info->local) /* Omit [unknown] for local */ | |
1428 | { | |
1429 | fprintf(f, "[unknown] "); | |
1430 | len = 7; | |
1431 | } | |
1432 | else len = -3; | |
1433 | while (len++ < maxaddlen) fprintf(f," "); | |
1434 | if (h->mx >= 0) fprintf(f, "MX=%d", h->mx); | |
1435 | if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port); | |
1436 | if (h->status == hstatus_unusable) fprintf(f, " ** unusable **"); | |
1437 | fprintf(f, "\n"); | |
1438 | } | |
1439 | } | |
1440 | } | |
1441 | } | |
1442 | ||
8e669ac1 | 1443 | /* Will be DEFER or FAIL if any one address has, only for full_info (which is |
2c7db3f5 PH |
1444 | the -bv or -bt case). */ |
1445 | ||
8e669ac1 | 1446 | return yield; |
059ec3d9 PH |
1447 | } |
1448 | ||
1449 | ||
1450 | ||
1451 | ||
1452 | /************************************************* | |
1453 | * Check headers for syntax errors * | |
1454 | *************************************************/ | |
1455 | ||
1456 | /* This function checks those header lines that contain addresses, and verifies | |
1457 | that all the addresses therein are syntactially correct. | |
1458 | ||
1459 | Arguments: | |
1460 | msgptr where to put an error message | |
1461 | ||
1462 | Returns: OK | |
1463 | FAIL | |
1464 | */ | |
1465 | ||
1466 | int | |
1467 | verify_check_headers(uschar **msgptr) | |
1468 | { | |
1469 | header_line *h; | |
1470 | uschar *colon, *s; | |
1eccaa59 | 1471 | int yield = OK; |
059ec3d9 | 1472 | |
1eccaa59 | 1473 | for (h = header_list; h != NULL && yield == OK; h = h->next) |
059ec3d9 PH |
1474 | { |
1475 | if (h->type != htype_from && | |
1476 | h->type != htype_reply_to && | |
1477 | h->type != htype_sender && | |
1478 | h->type != htype_to && | |
1479 | h->type != htype_cc && | |
1480 | h->type != htype_bcc) | |
1481 | continue; | |
1482 | ||
1483 | colon = Ustrchr(h->text, ':'); | |
1484 | s = colon + 1; | |
1485 | while (isspace(*s)) s++; | |
1486 | ||
1eccaa59 PH |
1487 | /* Loop for multiple addresses in the header, enabling group syntax. Note |
1488 | that we have to reset this after the header has been scanned. */ | |
059ec3d9 | 1489 | |
1eccaa59 | 1490 | parse_allow_group = TRUE; |
059ec3d9 PH |
1491 | |
1492 | while (*s != 0) | |
1493 | { | |
1494 | uschar *ss = parse_find_address_end(s, FALSE); | |
1495 | uschar *recipient, *errmess; | |
1496 | int terminator = *ss; | |
1497 | int start, end, domain; | |
1498 | ||
1499 | /* Temporarily terminate the string at this point, and extract the | |
1eccaa59 | 1500 | operative address within, allowing group syntax. */ |
059ec3d9 PH |
1501 | |
1502 | *ss = 0; | |
1503 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
1504 | *ss = terminator; | |
1505 | ||
1506 | /* Permit an unqualified address only if the message is local, or if the | |
1507 | sending host is configured to be permitted to send them. */ | |
1508 | ||
1509 | if (recipient != NULL && domain == 0) | |
1510 | { | |
1511 | if (h->type == htype_from || h->type == htype_sender) | |
1512 | { | |
1513 | if (!allow_unqualified_sender) recipient = NULL; | |
1514 | } | |
1515 | else | |
1516 | { | |
1517 | if (!allow_unqualified_recipient) recipient = NULL; | |
1518 | } | |
1519 | if (recipient == NULL) errmess = US"unqualified address not permitted"; | |
1520 | } | |
1521 | ||
1522 | /* It's an error if no address could be extracted, except for the special | |
1523 | case of an empty address. */ | |
1524 | ||
1525 | if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0) | |
1526 | { | |
1527 | uschar *verb = US"is"; | |
1528 | uschar *t = ss; | |
1ab95fa6 | 1529 | uschar *tt = colon; |
059ec3d9 PH |
1530 | int len; |
1531 | ||
1532 | /* Arrange not to include any white space at the end in the | |
1ab95fa6 | 1533 | error message or the header name. */ |
059ec3d9 PH |
1534 | |
1535 | while (t > s && isspace(t[-1])) t--; | |
1ab95fa6 | 1536 | while (tt > h->text && isspace(tt[-1])) tt--; |
059ec3d9 | 1537 | |
1ab95fa6 | 1538 | /* Add the address that failed to the error message, since in a |
059ec3d9 PH |
1539 | header with very many addresses it is sometimes hard to spot |
1540 | which one is at fault. However, limit the amount of address to | |
1541 | quote - cases have been seen where, for example, a missing double | |
1542 | quote in a humungous To: header creates an "address" that is longer | |
1543 | than string_sprintf can handle. */ | |
1544 | ||
1545 | len = t - s; | |
1546 | if (len > 1024) | |
1547 | { | |
1548 | len = 1024; | |
1549 | verb = US"begins"; | |
1550 | } | |
1551 | ||
1552 | *msgptr = string_printing( | |
1ab95fa6 PH |
1553 | string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s", |
1554 | errmess, tt - h->text, h->text, verb, len, s)); | |
059ec3d9 | 1555 | |
1eccaa59 PH |
1556 | yield = FAIL; |
1557 | break; /* Out of address loop */ | |
059ec3d9 PH |
1558 | } |
1559 | ||
1560 | /* Advance to the next address */ | |
1561 | ||
1562 | s = ss + (terminator? 1:0); | |
1563 | while (isspace(*s)) s++; | |
1564 | } /* Next address */ | |
059ec3d9 | 1565 | |
1eccaa59 PH |
1566 | parse_allow_group = FALSE; |
1567 | parse_found_group = FALSE; | |
1568 | } /* Next header unless yield has been set FALSE */ | |
1569 | ||
1570 | return yield; | |
059ec3d9 PH |
1571 | } |
1572 | ||
1573 | ||
1574 | ||
1c41c9cc PH |
1575 | /************************************************* |
1576 | * Check for blind recipients * | |
1577 | *************************************************/ | |
1578 | ||
1579 | /* This function checks that every (envelope) recipient is mentioned in either | |
1580 | the To: or Cc: header lines, thus detecting blind carbon copies. | |
1581 | ||
1582 | There are two ways of scanning that could be used: either scan the header lines | |
1583 | and tick off the recipients, or scan the recipients and check the header lines. | |
1584 | The original proposed patch did the former, but I have chosen to do the latter, | |
1585 | because (a) it requires no memory and (b) will use fewer resources when there | |
1586 | are many addresses in To: and/or Cc: and only one or two envelope recipients. | |
1587 | ||
1588 | Arguments: none | |
1589 | Returns: OK if there are no blind recipients | |
1590 | FAIL if there is at least one blind recipient | |
1591 | */ | |
1592 | ||
1593 | int | |
1594 | verify_check_notblind(void) | |
1595 | { | |
1596 | int i; | |
1597 | for (i = 0; i < recipients_count; i++) | |
1598 | { | |
1599 | header_line *h; | |
1600 | BOOL found = FALSE; | |
1601 | uschar *address = recipients_list[i].address; | |
1602 | ||
1603 | for (h = header_list; !found && h != NULL; h = h->next) | |
1604 | { | |
1605 | uschar *colon, *s; | |
1606 | ||
1607 | if (h->type != htype_to && h->type != htype_cc) continue; | |
1608 | ||
1609 | colon = Ustrchr(h->text, ':'); | |
1610 | s = colon + 1; | |
1611 | while (isspace(*s)) s++; | |
1612 | ||
1eccaa59 PH |
1613 | /* Loop for multiple addresses in the header, enabling group syntax. Note |
1614 | that we have to reset this after the header has been scanned. */ | |
1c41c9cc | 1615 | |
1eccaa59 | 1616 | parse_allow_group = TRUE; |
1c41c9cc PH |
1617 | |
1618 | while (*s != 0) | |
1619 | { | |
1620 | uschar *ss = parse_find_address_end(s, FALSE); | |
1621 | uschar *recipient,*errmess; | |
1622 | int terminator = *ss; | |
1623 | int start, end, domain; | |
1624 | ||
1625 | /* Temporarily terminate the string at this point, and extract the | |
1eccaa59 | 1626 | operative address within, allowing group syntax. */ |
1c41c9cc PH |
1627 | |
1628 | *ss = 0; | |
1629 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
1630 | *ss = terminator; | |
1631 | ||
1632 | /* If we found a valid recipient that has a domain, compare it with the | |
1633 | envelope recipient. Local parts are compared case-sensitively, domains | |
1634 | case-insensitively. By comparing from the start with length "domain", we | |
1635 | include the "@" at the end, which ensures that we are comparing the whole | |
1636 | local part of each address. */ | |
1637 | ||
1638 | if (recipient != NULL && domain != 0) | |
1639 | { | |
1640 | found = Ustrncmp(recipient, address, domain) == 0 && | |
1641 | strcmpic(recipient + domain, address + domain) == 0; | |
1642 | if (found) break; | |
1643 | } | |
1644 | ||
1645 | /* Advance to the next address */ | |
1646 | ||
1647 | s = ss + (terminator? 1:0); | |
1648 | while (isspace(*s)) s++; | |
1649 | } /* Next address */ | |
1eccaa59 PH |
1650 | |
1651 | parse_allow_group = FALSE; | |
1652 | parse_found_group = FALSE; | |
1c41c9cc PH |
1653 | } /* Next header (if found is false) */ |
1654 | ||
1655 | if (!found) return FAIL; | |
1656 | } /* Next recipient */ | |
1657 | ||
1658 | return OK; | |
1659 | } | |
1660 | ||
1661 | ||
059ec3d9 PH |
1662 | |
1663 | /************************************************* | |
1664 | * Find if verified sender * | |
1665 | *************************************************/ | |
1666 | ||
1667 | /* Usually, just a single address is verified as the sender of the message. | |
1668 | However, Exim can be made to verify other addresses as well (often related in | |
1669 | some way), and this is useful in some environments. There may therefore be a | |
1670 | chain of such addresses that have previously been tested. This function finds | |
1671 | whether a given address is on the chain. | |
1672 | ||
1673 | Arguments: the address to be verified | |
1674 | Returns: pointer to an address item, or NULL | |
1675 | */ | |
1676 | ||
1677 | address_item * | |
1678 | verify_checked_sender(uschar *sender) | |
1679 | { | |
1680 | address_item *addr; | |
1681 | for (addr = sender_verified_list; addr != NULL; addr = addr->next) | |
1682 | if (Ustrcmp(sender, addr->address) == 0) break; | |
1683 | return addr; | |
1684 | } | |
1685 | ||
1686 | ||
1687 | ||
1688 | ||
1689 | ||
1690 | /************************************************* | |
1691 | * Get valid header address * | |
1692 | *************************************************/ | |
1693 | ||
1694 | /* Scan the originator headers of the message, looking for an address that | |
1695 | verifies successfully. RFC 822 says: | |
1696 | ||
1697 | o The "Sender" field mailbox should be sent notices of | |
1698 | any problems in transport or delivery of the original | |
1699 | messages. If there is no "Sender" field, then the | |
1700 | "From" field mailbox should be used. | |
1701 | ||
1702 | o If the "Reply-To" field exists, then the reply should | |
1703 | go to the addresses indicated in that field and not to | |
1704 | the address(es) indicated in the "From" field. | |
1705 | ||
1706 | So we check a Sender field if there is one, else a Reply_to field, else a From | |
1707 | field. As some strange messages may have more than one of these fields, | |
1708 | especially if they are resent- fields, check all of them if there is more than | |
1709 | one. | |
1710 | ||
1711 | Arguments: | |
1712 | user_msgptr points to where to put a user error message | |
1713 | log_msgptr points to where to put a log error message | |
1714 | callout timeout for callout check (passed to verify_address()) | |
1715 | callout_overall overall callout timeout (ditto) | |
8e669ac1 | 1716 | callout_connect connect callout timeout (ditto) |
059ec3d9 PH |
1717 | se_mailfrom mailfrom for verify; NULL => "" |
1718 | pm_mailfrom sender for pm callout check (passed to verify_address()) | |
1719 | options callout options (passed to verify_address()) | |
8e669ac1 | 1720 | verrno where to put the address basic_errno |
059ec3d9 PH |
1721 | |
1722 | If log_msgptr is set to something without setting user_msgptr, the caller | |
1723 | normally uses log_msgptr for both things. | |
1724 | ||
1725 | Returns: result of the verification attempt: OK, FAIL, or DEFER; | |
1726 | FAIL is given if no appropriate headers are found | |
1727 | */ | |
1728 | ||
1729 | int | |
1730 | verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr, | |
8e669ac1 | 1731 | int callout, int callout_overall, int callout_connect, uschar *se_mailfrom, |
fe5b5d0b | 1732 | uschar *pm_mailfrom, int options, int *verrno) |
059ec3d9 PH |
1733 | { |
1734 | static int header_types[] = { htype_sender, htype_reply_to, htype_from }; | |
1eccaa59 | 1735 | BOOL done = FALSE; |
059ec3d9 PH |
1736 | int yield = FAIL; |
1737 | int i; | |
1738 | ||
1eccaa59 | 1739 | for (i = 0; i < 3 && !done; i++) |
059ec3d9 PH |
1740 | { |
1741 | header_line *h; | |
1eccaa59 | 1742 | for (h = header_list; h != NULL && !done; h = h->next) |
059ec3d9 PH |
1743 | { |
1744 | int terminator, new_ok; | |
1745 | uschar *s, *ss, *endname; | |
1746 | ||
1747 | if (h->type != header_types[i]) continue; | |
1748 | s = endname = Ustrchr(h->text, ':') + 1; | |
1749 | ||
1eccaa59 PH |
1750 | /* Scan the addresses in the header, enabling group syntax. Note that we |
1751 | have to reset this after the header has been scanned. */ | |
1752 | ||
1753 | parse_allow_group = TRUE; | |
1754 | ||
059ec3d9 PH |
1755 | while (*s != 0) |
1756 | { | |
1757 | address_item *vaddr; | |
1758 | ||
1759 | while (isspace(*s) || *s == ',') s++; | |
1760 | if (*s == 0) break; /* End of header */ | |
1761 | ||
1762 | ss = parse_find_address_end(s, FALSE); | |
1763 | ||
1764 | /* The terminator is a comma or end of header, but there may be white | |
1765 | space preceding it (including newline for the last address). Move back | |
1766 | past any white space so we can check against any cached envelope sender | |
1767 | address verifications. */ | |
1768 | ||
1769 | while (isspace(ss[-1])) ss--; | |
1770 | terminator = *ss; | |
1771 | *ss = 0; | |
1772 | ||
1773 | HDEBUG(D_verify) debug_printf("verifying %.*s header address %s\n", | |
1774 | (int)(endname - h->text), h->text, s); | |
1775 | ||
1776 | /* See if we have already verified this address as an envelope sender, | |
1777 | and if so, use the previous answer. */ | |
1778 | ||
1779 | vaddr = verify_checked_sender(s); | |
1780 | ||
1781 | if (vaddr != NULL && /* Previously checked */ | |
1782 | (callout <= 0 || /* No callout needed; OR */ | |
1783 | vaddr->special_action > 256)) /* Callout was done */ | |
1784 | { | |
1785 | new_ok = vaddr->special_action & 255; | |
1786 | HDEBUG(D_verify) debug_printf("previously checked as envelope sender\n"); | |
1787 | *ss = terminator; /* Restore shortened string */ | |
1788 | } | |
1789 | ||
1790 | /* Otherwise we run the verification now. We must restore the shortened | |
1791 | string before running the verification, so the headers are correct, in | |
1792 | case there is any rewriting. */ | |
1793 | ||
1794 | else | |
1795 | { | |
1796 | int start, end, domain; | |
1eccaa59 PH |
1797 | uschar *address = parse_extract_address(s, log_msgptr, &start, &end, |
1798 | &domain, FALSE); | |
059ec3d9 PH |
1799 | |
1800 | *ss = terminator; | |
1801 | ||
1eccaa59 PH |
1802 | /* If we found an empty address, just carry on with the next one, but |
1803 | kill the message. */ | |
1804 | ||
1805 | if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0) | |
1806 | { | |
1807 | *log_msgptr = NULL; | |
1808 | s = ss; | |
1809 | continue; | |
1810 | } | |
1811 | ||
059ec3d9 PH |
1812 | /* If verification failed because of a syntax error, fail this |
1813 | function, and ensure that the failing address gets added to the error | |
1814 | message. */ | |
1815 | ||
1816 | if (address == NULL) | |
1817 | { | |
1818 | new_ok = FAIL; | |
1eccaa59 PH |
1819 | while (ss > s && isspace(ss[-1])) ss--; |
1820 | *log_msgptr = string_sprintf("syntax error in '%.*s' header when " | |
1821 | "scanning for sender: %s in \"%.*s\"", | |
1822 | endname - h->text, h->text, *log_msgptr, ss - s, s); | |
1823 | yield = FAIL; | |
1824 | done = TRUE; | |
1825 | break; | |
059ec3d9 PH |
1826 | } |
1827 | ||
2f6603e1 | 1828 | /* Else go ahead with the sender verification. But it isn't *the* |
059ec3d9 PH |
1829 | sender of the message, so set vopt_fake_sender to stop sender_address |
1830 | being replaced after rewriting or qualification. */ | |
1831 | ||
1832 | else | |
1833 | { | |
1834 | vaddr = deliver_make_addr(address, FALSE); | |
1835 | new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender, | |
8e669ac1 | 1836 | callout, callout_overall, callout_connect, se_mailfrom, |
4deaf07d | 1837 | pm_mailfrom, NULL); |
059ec3d9 PH |
1838 | } |
1839 | } | |
1840 | ||
1841 | /* We now have the result, either newly found, or cached. If we are | |
1842 | giving out error details, set a specific user error. This means that the | |
1843 | last of these will be returned to the user if all three fail. We do not | |
1844 | set a log message - the generic one below will be used. */ | |
1845 | ||
fe5b5d0b | 1846 | if (new_ok != OK) |
059ec3d9 | 1847 | { |
8e669ac1 | 1848 | *verrno = vaddr->basic_errno; |
fe5b5d0b PH |
1849 | if (smtp_return_error_details) |
1850 | { | |
1851 | *user_msgptr = string_sprintf("Rejected after DATA: " | |
1852 | "could not verify \"%.*s\" header address\n%s: %s", | |
1853 | endname - h->text, h->text, vaddr->address, vaddr->message); | |
1854 | } | |
8e669ac1 | 1855 | } |
059ec3d9 PH |
1856 | |
1857 | /* Success or defer */ | |
1858 | ||
1eccaa59 PH |
1859 | if (new_ok == OK) |
1860 | { | |
1861 | yield = OK; | |
1862 | done = TRUE; | |
1863 | break; | |
1864 | } | |
1865 | ||
059ec3d9 PH |
1866 | if (new_ok == DEFER) yield = DEFER; |
1867 | ||
1868 | /* Move on to any more addresses in the header */ | |
1869 | ||
1870 | s = ss; | |
1eccaa59 PH |
1871 | } /* Next address */ |
1872 | ||
1873 | parse_allow_group = FALSE; | |
1874 | parse_found_group = FALSE; | |
1875 | } /* Next header, unless done */ | |
1876 | } /* Next header type unless done */ | |
059ec3d9 PH |
1877 | |
1878 | if (yield == FAIL && *log_msgptr == NULL) | |
1879 | *log_msgptr = US"there is no valid sender in any header line"; | |
1880 | ||
1881 | if (yield == DEFER && *log_msgptr == NULL) | |
1882 | *log_msgptr = US"all attempts to verify a sender in a header line deferred"; | |
1883 | ||
1884 | return yield; | |
1885 | } | |
1886 | ||
1887 | ||
1888 | ||
1889 | ||
1890 | /************************************************* | |
1891 | * Get RFC 1413 identification * | |
1892 | *************************************************/ | |
1893 | ||
1894 | /* Attempt to get an id from the sending machine via the RFC 1413 protocol. If | |
1895 | the timeout is set to zero, then the query is not done. There may also be lists | |
1896 | of hosts and nets which are exempt. To guard against malefactors sending | |
1897 | non-printing characters which could, for example, disrupt a message's headers, | |
1898 | make sure the string consists of printing characters only. | |
1899 | ||
1900 | Argument: | |
1901 | port the port to connect to; usually this is IDENT_PORT (113), but when | |
1902 | running in the test harness with -bh a different value is used. | |
1903 | ||
1904 | Returns: nothing | |
1905 | ||
1906 | Side effect: any received ident value is put in sender_ident (NULL otherwise) | |
1907 | */ | |
1908 | ||
1909 | void | |
1910 | verify_get_ident(int port) | |
1911 | { | |
1912 | int sock, host_af, qlen; | |
1913 | int received_sender_port, received_interface_port, n; | |
1914 | uschar *p; | |
1915 | uschar buffer[2048]; | |
1916 | ||
1917 | /* Default is no ident. Check whether we want to do an ident check for this | |
1918 | host. */ | |
1919 | ||
1920 | sender_ident = NULL; | |
1921 | if (rfc1413_query_timeout <= 0 || verify_check_host(&rfc1413_hosts) != OK) | |
1922 | return; | |
1923 | ||
1924 | DEBUG(D_ident) debug_printf("doing ident callback\n"); | |
1925 | ||
1926 | /* Set up a connection to the ident port of the remote host. Bind the local end | |
1927 | to the incoming interface address. If the sender host address is an IPv6 | |
1928 | address, the incoming interface address will also be IPv6. */ | |
1929 | ||
1930 | host_af = (Ustrchr(sender_host_address, ':') == NULL)? AF_INET : AF_INET6; | |
1931 | sock = ip_socket(SOCK_STREAM, host_af); | |
1932 | if (sock < 0) return; | |
1933 | ||
1934 | if (ip_bind(sock, host_af, interface_address, 0) < 0) | |
1935 | { | |
1936 | DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n", | |
1937 | strerror(errno)); | |
1938 | goto END_OFF; | |
1939 | } | |
1940 | ||
1941 | if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout) | |
1942 | < 0) | |
1943 | { | |
1944 | if (errno == ETIMEDOUT && (log_extra_selector & LX_ident_timeout) != 0) | |
1945 | { | |
1946 | log_write(0, LOG_MAIN, "ident connection to %s timed out", | |
1947 | sender_host_address); | |
1948 | } | |
1949 | else | |
1950 | { | |
1951 | DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n", | |
1952 | sender_host_address, strerror(errno)); | |
1953 | } | |
1954 | goto END_OFF; | |
1955 | } | |
1956 | ||
1957 | /* Construct and send the query. */ | |
1958 | ||
1959 | sprintf(CS buffer, "%d , %d\r\n", sender_host_port, interface_port); | |
1960 | qlen = Ustrlen(buffer); | |
1961 | if (send(sock, buffer, qlen, 0) < 0) | |
1962 | { | |
1963 | DEBUG(D_ident) debug_printf("ident send failed: %s\n", strerror(errno)); | |
1964 | goto END_OFF; | |
1965 | } | |
1966 | ||
1967 | /* Read a response line. We put it into the rest of the buffer, using several | |
1968 | recv() calls if necessary. */ | |
1969 | ||
1970 | p = buffer + qlen; | |
1971 | ||
1972 | for (;;) | |
1973 | { | |
1974 | uschar *pp; | |
1975 | int count; | |
1976 | int size = sizeof(buffer) - (p - buffer); | |
1977 | ||
1978 | if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */ | |
1979 | count = ip_recv(sock, p, size, rfc1413_query_timeout); | |
1980 | if (count <= 0) goto END_OFF; /* Read error or EOF */ | |
1981 | ||
1982 | /* Scan what we just read, to see if we have reached the terminating \r\n. Be | |
1983 | generous, and accept a plain \n terminator as well. The only illegal | |
1984 | character is 0. */ | |
1985 | ||
1986 | for (pp = p; pp < p + count; pp++) | |
1987 | { | |
1988 | if (*pp == 0) goto END_OFF; /* Zero octet not allowed */ | |
1989 | if (*pp == '\n') | |
1990 | { | |
1991 | if (pp[-1] == '\r') pp--; | |
1992 | *pp = 0; | |
1993 | goto GOT_DATA; /* Break out of both loops */ | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | /* Reached the end of the data without finding \n. Let the loop continue to | |
1998 | read some more, if there is room. */ | |
1999 | ||
2000 | p = pp; | |
2001 | } | |
2002 | ||
2003 | GOT_DATA: | |
2004 | ||
2005 | /* We have received a line of data. Check it carefully. It must start with the | |
2006 | same two port numbers that we sent, followed by data as defined by the RFC. For | |
2007 | example, | |
2008 | ||
2009 | 12345 , 25 : USERID : UNIX :root | |
2010 | ||
2011 | However, the amount of white space may be different to what we sent. In the | |
2012 | "osname" field there may be several sub-fields, comma separated. The data we | |
2013 | actually want to save follows the third colon. Some systems put leading spaces | |
2014 | in it - we discard those. */ | |
2015 | ||
2016 | if (sscanf(CS buffer + qlen, "%d , %d%n", &received_sender_port, | |
2017 | &received_interface_port, &n) != 2 || | |
2018 | received_sender_port != sender_host_port || | |
2019 | received_interface_port != interface_port) | |
2020 | goto END_OFF; | |
2021 | ||
2022 | p = buffer + qlen + n; | |
2023 | while(isspace(*p)) p++; | |
2024 | if (*p++ != ':') goto END_OFF; | |
2025 | while(isspace(*p)) p++; | |
2026 | if (Ustrncmp(p, "USERID", 6) != 0) goto END_OFF; | |
2027 | p += 6; | |
2028 | while(isspace(*p)) p++; | |
2029 | if (*p++ != ':') goto END_OFF; | |
2030 | while (*p != 0 && *p != ':') p++; | |
2031 | if (*p++ == 0) goto END_OFF; | |
2032 | while(isspace(*p)) p++; | |
2033 | if (*p == 0) goto END_OFF; | |
2034 | ||
2035 | /* The rest of the line is the data we want. We turn it into printing | |
2036 | characters when we save it, so that it cannot mess up the format of any logging | |
2037 | or Received: lines into which it gets inserted. We keep a maximum of 127 | |
2038 | characters. */ | |
2039 | ||
2040 | sender_ident = string_printing(string_copyn(p, 127)); | |
2041 | DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident); | |
2042 | ||
2043 | END_OFF: | |
f1e894f3 | 2044 | (void)close(sock); |
059ec3d9 PH |
2045 | return; |
2046 | } | |
2047 | ||
2048 | ||
2049 | ||
2050 | ||
2051 | /************************************************* | |
2052 | * Match host to a single host-list item * | |
2053 | *************************************************/ | |
2054 | ||
2055 | /* This function compares a host (name or address) against a single item | |
2056 | from a host list. The host name gets looked up if it is needed and is not | |
2057 | already known. The function is called from verify_check_this_host() via | |
2058 | match_check_list(), which is why most of its arguments are in a single block. | |
2059 | ||
2060 | Arguments: | |
2061 | arg the argument block (see below) | |
2062 | ss the host-list item | |
2063 | valueptr where to pass back looked up data, or NULL | |
2064 | error for error message when returning ERROR | |
2065 | ||
2066 | The block contains: | |
32d668a5 PH |
2067 | host_name (a) the host name, or |
2068 | (b) NULL, implying use sender_host_name and | |
2069 | sender_host_aliases, looking them up if required, or | |
2070 | (c) the empty string, meaning that only IP address matches | |
2071 | are permitted | |
059ec3d9 PH |
2072 | host_address the host address |
2073 | host_ipv4 the IPv4 address taken from an IPv6 one | |
2074 | ||
2075 | Returns: OK matched | |
2076 | FAIL did not match | |
2077 | DEFER lookup deferred | |
32d668a5 PH |
2078 | ERROR (a) failed to find the host name or IP address, or |
2079 | (b) unknown lookup type specified, or | |
2080 | (c) host name encountered when only IP addresses are | |
2081 | being matched | |
059ec3d9 PH |
2082 | */ |
2083 | ||
32d668a5 | 2084 | int |
059ec3d9 PH |
2085 | check_host(void *arg, uschar *ss, uschar **valueptr, uschar **error) |
2086 | { | |
2087 | check_host_block *cb = (check_host_block *)arg; | |
32d668a5 | 2088 | int mlen = -1; |
059ec3d9 | 2089 | int maskoffset; |
32d668a5 | 2090 | BOOL iplookup = FALSE; |
059ec3d9 | 2091 | BOOL isquery = FALSE; |
32d668a5 | 2092 | BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0; |
1688f43b | 2093 | uschar *t; |
32d668a5 | 2094 | uschar *semicolon; |
059ec3d9 PH |
2095 | uschar **aliases; |
2096 | ||
2097 | /* Optimize for the special case when the pattern is "*". */ | |
2098 | ||
2099 | if (*ss == '*' && ss[1] == 0) return OK; | |
2100 | ||
2101 | /* If the pattern is empty, it matches only in the case when there is no host - | |
2102 | this can occur in ACL checking for SMTP input using the -bs option. In this | |
2103 | situation, the host address is the empty string. */ | |
2104 | ||
2105 | if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL; | |
2106 | if (*ss == 0) return FAIL; | |
2107 | ||
32d668a5 PH |
2108 | /* If the pattern is precisely "@" then match against the primary host name, |
2109 | provided that host name matching is permitted; if it's "@[]" match against the | |
2110 | local host's IP addresses. */ | |
059ec3d9 PH |
2111 | |
2112 | if (*ss == '@') | |
2113 | { | |
32d668a5 PH |
2114 | if (ss[1] == 0) |
2115 | { | |
2116 | if (isiponly) return ERROR; | |
2117 | ss = primary_hostname; | |
2118 | } | |
059ec3d9 PH |
2119 | else if (Ustrcmp(ss, "@[]") == 0) |
2120 | { | |
2121 | ip_address_item *ip; | |
2122 | for (ip = host_find_interfaces(); ip != NULL; ip = ip->next) | |
2123 | if (Ustrcmp(ip->address, cb->host_address) == 0) return OK; | |
2124 | return FAIL; | |
2125 | } | |
2126 | } | |
2127 | ||
2128 | /* If the pattern is an IP address, optionally followed by a bitmask count, do | |
2129 | a (possibly masked) comparision with the current IP address. */ | |
2130 | ||
7e66e54d | 2131 | if (string_is_ip_address(ss, &maskoffset) != 0) |
059ec3d9 PH |
2132 | return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL); |
2133 | ||
1688f43b PH |
2134 | /* The pattern is not an IP address. A common error that people make is to omit |
2135 | one component of an IPv4 address, either by accident, or believing that, for | |
2136 | 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, | |
2137 | which it isn't. (Those applications that do accept 1.2.3 as an IP address | |
2138 | interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an | |
2139 | ancient specification.) To aid in debugging these cases, we give a specific | |
2140 | error if the pattern contains only digits and dots or contains a slash preceded | |
2141 | only by digits and dots (a slash at the start indicates a file name and of | |
2142 | course slashes may be present in lookups, but not preceded only by digits and | |
2143 | dots). */ | |
2144 | ||
2145 | for (t = ss; isdigit(*t) || *t == '.'; t++); | |
2146 | if (*t == 0 || (*t == '/' && t != ss)) | |
2147 | { | |
2148 | *error = US"malformed IPv4 address or address mask"; | |
2149 | return ERROR; | |
2150 | } | |
2151 | ||
32d668a5 | 2152 | /* See if there is a semicolon in the pattern */ |
059ec3d9 | 2153 | |
32d668a5 PH |
2154 | semicolon = Ustrchr(ss, ';'); |
2155 | ||
2156 | /* If we are doing an IP address only match, then all lookups must be IP | |
df199fec | 2157 | address lookups, even if there is no "net-". */ |
32d668a5 PH |
2158 | |
2159 | if (isiponly) | |
059ec3d9 | 2160 | { |
32d668a5 PH |
2161 | iplookup = semicolon != NULL; |
2162 | } | |
059ec3d9 | 2163 | |
32d668a5 | 2164 | /* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is |
df199fec PH |
2165 | a lookup on a masked IP network, in textual form. We obey this code even if we |
2166 | have already set iplookup, so as to skip over the "net-" prefix and to set the | |
2167 | mask length. The net- stuff really only applies to single-key lookups where the | |
2168 | key is implicit. For query-style lookups the key is specified in the query. | |
2169 | From release 4.30, the use of net- for query style is no longer needed, but we | |
2170 | retain it for backward compatibility. */ | |
2171 | ||
2172 | if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL) | |
32d668a5 PH |
2173 | { |
2174 | mlen = 0; | |
2175 | for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0'; | |
2176 | if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */ | |
2177 | iplookup = (*t++ == '-'); | |
2178 | } | |
1688f43b | 2179 | else t = ss; |
059ec3d9 | 2180 | |
32d668a5 | 2181 | /* Do the IP address lookup if that is indeed what we have */ |
059ec3d9 | 2182 | |
32d668a5 PH |
2183 | if (iplookup) |
2184 | { | |
2185 | int insize; | |
2186 | int search_type; | |
2187 | int incoming[4]; | |
2188 | void *handle; | |
2189 | uschar *filename, *key, *result; | |
2190 | uschar buffer[64]; | |
059ec3d9 | 2191 | |
32d668a5 | 2192 | /* Find the search type */ |
059ec3d9 | 2193 | |
32d668a5 | 2194 | search_type = search_findtype(t, semicolon - t); |
059ec3d9 | 2195 | |
32d668a5 PH |
2196 | if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", |
2197 | search_error_message); | |
059ec3d9 | 2198 | |
13b685f9 PH |
2199 | /* Adjust parameters for the type of lookup. For a query-style lookup, there |
2200 | is no file name, and the "key" is just the query. For query-style with a file | |
2201 | name, we have to fish the file off the start of the query. For a single-key | |
2202 | lookup, the key is the current IP address, masked appropriately, and | |
2203 | reconverted to text form, with the mask appended. For IPv6 addresses, specify | |
6a3bceb1 PH |
2204 | dot separators instead of colons, except when the lookup type is "iplsearch". |
2205 | */ | |
059ec3d9 | 2206 | |
13b685f9 PH |
2207 | if (mac_islookup(search_type, lookup_absfilequery)) |
2208 | { | |
2209 | filename = semicolon + 1; | |
2210 | key = filename; | |
2211 | while (*key != 0 && !isspace(*key)) key++; | |
2212 | filename = string_copyn(filename, key - filename); | |
2213 | while (isspace(*key)) key++; | |
2214 | } | |
2215 | else if (mac_islookup(search_type, lookup_querystyle)) | |
32d668a5 PH |
2216 | { |
2217 | filename = NULL; | |
2218 | key = semicolon + 1; | |
2219 | } | |
6a3bceb1 | 2220 | else /* Single-key style */ |
32d668a5 | 2221 | { |
6a3bceb1 PH |
2222 | int sep = (Ustrcmp(lookup_list[search_type].name, "iplsearch") == 0)? |
2223 | ':' : '.'; | |
32d668a5 PH |
2224 | insize = host_aton(cb->host_address, incoming); |
2225 | host_mask(insize, incoming, mlen); | |
6a3bceb1 | 2226 | (void)host_nmtoa(insize, incoming, mlen, buffer, sep); |
32d668a5 PH |
2227 | key = buffer; |
2228 | filename = semicolon + 1; | |
059ec3d9 | 2229 | } |
32d668a5 PH |
2230 | |
2231 | /* Now do the actual lookup; note that there is no search_close() because | |
2232 | of the caching arrangements. */ | |
2233 | ||
2234 | handle = search_open(filename, search_type, 0, NULL, NULL); | |
2235 | if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", | |
2236 | search_error_message); | |
2237 | result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL); | |
2238 | if (valueptr != NULL) *valueptr = result; | |
2239 | return (result != NULL)? OK : search_find_defer? DEFER: FAIL; | |
059ec3d9 PH |
2240 | } |
2241 | ||
2242 | /* The pattern is not an IP address or network reference of any kind. That is, | |
32d668a5 PH |
2243 | it is a host name pattern. If this is an IP only match, there's an error in the |
2244 | host list. */ | |
2245 | ||
2246 | if (isiponly) | |
2247 | { | |
2248 | *error = US"cannot match host name in match_ip list"; | |
2249 | return ERROR; | |
2250 | } | |
2251 | ||
2252 | /* Check the characters of the pattern to see if they comprise only letters, | |
2253 | digits, full stops, and hyphens (the constituents of domain names). Allow | |
2254 | underscores, as they are all too commonly found. Sigh. Also, if | |
2255 | allow_utf8_domains is set, allow top-bit characters. */ | |
059ec3d9 PH |
2256 | |
2257 | for (t = ss; *t != 0; t++) | |
2258 | if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' && | |
2259 | (!allow_utf8_domains || *t < 128)) break; | |
2260 | ||
2261 | /* If the pattern is a complete domain name, with no fancy characters, look up | |
2262 | its IP address and match against that. Note that a multi-homed host will add | |
2263 | items to the chain. */ | |
2264 | ||
2265 | if (*t == 0) | |
2266 | { | |
2267 | int rc; | |
2268 | host_item h; | |
2269 | h.next = NULL; | |
2270 | h.name = ss; | |
2271 | h.address = NULL; | |
2272 | h.mx = MX_NONE; | |
9b8fadde | 2273 | |
322050c2 | 2274 | rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE); |
059ec3d9 PH |
2275 | if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL) |
2276 | { | |
2277 | host_item *hh; | |
2278 | for (hh = &h; hh != NULL; hh = hh->next) | |
2279 | { | |
96776534 | 2280 | if (host_is_in_net(hh->address, cb->host_address, 0)) return OK; |
059ec3d9 PH |
2281 | } |
2282 | return FAIL; | |
2283 | } | |
2284 | if (rc == HOST_FIND_AGAIN) return DEFER; | |
2285 | *error = string_sprintf("failed to find IP address for %s", ss); | |
2286 | return ERROR; | |
2287 | } | |
2288 | ||
2289 | /* Almost all subsequent comparisons require the host name, and can be done | |
2290 | using the general string matching function. When this function is called for | |
2291 | outgoing hosts, the name is always given explicitly. If it is NULL, it means we | |
2292 | must use sender_host_name and its aliases, looking them up if necessary. */ | |
2293 | ||
2294 | if (cb->host_name != NULL) /* Explicit host name given */ | |
2295 | return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE, | |
2296 | valueptr); | |
2297 | ||
2298 | /* Host name not given; in principle we need the sender host name and its | |
2299 | aliases. However, for query-style lookups, we do not need the name if the | |
2300 | query does not contain $sender_host_name. From release 4.23, a reference to | |
2301 | $sender_host_name causes it to be looked up, so we don't need to do the lookup | |
2302 | on spec. */ | |
2303 | ||
2304 | if ((semicolon = Ustrchr(ss, ';')) != NULL) | |
2305 | { | |
2306 | uschar *affix; | |
2307 | int partial, affixlen, starflags, id; | |
2308 | ||
2309 | *semicolon = 0; | |
2310 | id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags); | |
2311 | *semicolon=';'; | |
2312 | ||
2313 | if (id < 0) /* Unknown lookup type */ | |
2314 | { | |
2315 | log_write(0, LOG_MAIN|LOG_PANIC, "%s in host list item \"%s\"", | |
2316 | search_error_message, ss); | |
2317 | return DEFER; | |
2318 | } | |
13b685f9 | 2319 | isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery); |
059ec3d9 PH |
2320 | } |
2321 | ||
2322 | if (isquery) | |
2323 | { | |
2324 | switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr)) | |
2325 | { | |
2326 | case OK: return OK; | |
2327 | case DEFER: return DEFER; | |
2328 | default: return FAIL; | |
2329 | } | |
2330 | } | |
2331 | ||
2332 | /* Not a query-style lookup; must ensure the host name is present, and then we | |
2333 | do a check on the name and all its aliases. */ | |
2334 | ||
2335 | if (sender_host_name == NULL) | |
2336 | { | |
2337 | HDEBUG(D_host_lookup) | |
2338 | debug_printf("sender host name required, to match against %s\n", ss); | |
2339 | if (host_lookup_failed || host_name_lookup() != OK) | |
2340 | { | |
2341 | *error = string_sprintf("failed to find host name for %s", | |
2342 | sender_host_address);; | |
2343 | return ERROR; | |
2344 | } | |
2345 | host_build_sender_fullhost(); | |
2346 | } | |
2347 | ||
2348 | /* Match on the sender host name, using the general matching function */ | |
2349 | ||
2350 | switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE, | |
2351 | valueptr)) | |
2352 | { | |
2353 | case OK: return OK; | |
2354 | case DEFER: return DEFER; | |
2355 | } | |
2356 | ||
2357 | /* If there are aliases, try matching on them. */ | |
2358 | ||
2359 | aliases = sender_host_aliases; | |
2360 | while (*aliases != NULL) | |
2361 | { | |
2362 | switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr)) | |
2363 | { | |
2364 | case OK: return OK; | |
2365 | case DEFER: return DEFER; | |
2366 | } | |
2367 | } | |
2368 | return FAIL; | |
2369 | } | |
2370 | ||
2371 | ||
2372 | ||
2373 | ||
2374 | /************************************************* | |
2375 | * Check a specific host matches a host list * | |
2376 | *************************************************/ | |
2377 | ||
2378 | /* This function is passed a host list containing items in a number of | |
2379 | different formats and the identity of a host. Its job is to determine whether | |
2380 | the given host is in the set of hosts defined by the list. The host name is | |
2381 | passed as a pointer so that it can be looked up if needed and not already | |
2382 | known. This is commonly the case when called from verify_check_host() to check | |
2383 | an incoming connection. When called from elsewhere the host name should usually | |
2384 | be set. | |
2385 | ||
2386 | This function is now just a front end to match_check_list(), which runs common | |
2387 | code for scanning a list. We pass it the check_host() function to perform a | |
2388 | single test. | |
2389 | ||
2390 | Arguments: | |
2391 | listptr pointer to the host list | |
2392 | cache_bits pointer to cache for named lists, or NULL | |
2393 | host_name the host name or NULL, implying use sender_host_name and | |
2394 | sender_host_aliases, looking them up if required | |
2395 | host_address the IP address | |
2396 | valueptr if not NULL, data from a lookup is passed back here | |
2397 | ||
2398 | Returns: OK if the host is in the defined set | |
2399 | FAIL if the host is not in the defined set, | |
2400 | DEFER if a data lookup deferred (not a host lookup) | |
2401 | ||
2402 | If the host name was needed in order to make a comparison, and could not be | |
2403 | determined from the IP address, the result is FAIL unless the item | |
2404 | "+allow_unknown" was met earlier in the list, in which case OK is returned. */ | |
2405 | ||
2406 | int | |
2407 | verify_check_this_host(uschar **listptr, unsigned int *cache_bits, | |
2408 | uschar *host_name, uschar *host_address, uschar **valueptr) | |
2409 | { | |
d4eb88df | 2410 | int rc; |
059ec3d9 | 2411 | unsigned int *local_cache_bits = cache_bits; |
d4eb88df | 2412 | uschar *save_host_address = deliver_host_address; |
059ec3d9 PH |
2413 | check_host_block cb; |
2414 | cb.host_name = host_name; | |
2415 | cb.host_address = host_address; | |
2416 | ||
2417 | if (valueptr != NULL) *valueptr = NULL; | |
2418 | ||
2419 | /* If the host address starts off ::ffff: it is an IPv6 address in | |
2420 | IPv4-compatible mode. Find the IPv4 part for checking against IPv4 | |
2421 | addresses. */ | |
2422 | ||
2423 | cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)? | |
2424 | host_address + 7 : host_address; | |
2425 | ||
8e669ac1 PH |
2426 | /* During the running of the check, put the IP address into $host_address. In |
2427 | the case of calls from the smtp transport, it will already be there. However, | |
2428 | in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on | |
d4eb88df PH |
2429 | the safe side, any existing setting is preserved, though as I write this |
2430 | (November 2004) I can't see any cases where it is actually needed. */ | |
2431 | ||
2432 | deliver_host_address = host_address; | |
2433 | rc = match_check_list( | |
2434 | listptr, /* the list */ | |
2435 | 0, /* separator character */ | |
2436 | &hostlist_anchor, /* anchor pointer */ | |
2437 | &local_cache_bits, /* cache pointer */ | |
2438 | check_host, /* function for testing */ | |
2439 | &cb, /* argument for function */ | |
2440 | MCL_HOST, /* type of check */ | |
8e669ac1 | 2441 | (host_address == sender_host_address)? |
d4eb88df PH |
2442 | US"host" : host_address, /* text for debugging */ |
2443 | valueptr); /* where to pass back data */ | |
2444 | deliver_host_address = save_host_address; | |
8e669ac1 | 2445 | return rc; |
059ec3d9 PH |
2446 | } |
2447 | ||
2448 | ||
2449 | ||
2450 | ||
2451 | /************************************************* | |
2452 | * Check the remote host matches a list * | |
2453 | *************************************************/ | |
2454 | ||
2455 | /* This is a front end to verify_check_this_host(), created because checking | |
2456 | the remote host is a common occurrence. With luck, a good compiler will spot | |
2457 | the tail recursion and optimize it. If there's no host address, this is | |
2458 | command-line SMTP input - check against an empty string for the address. | |
2459 | ||
2460 | Arguments: | |
2461 | listptr pointer to the host list | |
2462 | ||
2463 | Returns: the yield of verify_check_this_host(), | |
2464 | i.e. OK, FAIL, or DEFER | |
2465 | */ | |
2466 | ||
2467 | int | |
2468 | verify_check_host(uschar **listptr) | |
2469 | { | |
2470 | return verify_check_this_host(listptr, sender_host_cache, NULL, | |
2471 | (sender_host_address == NULL)? US"" : sender_host_address, NULL); | |
2472 | } | |
2473 | ||
2474 | ||
2475 | ||
2476 | ||
2477 | ||
2478 | /************************************************* | |
2479 | * Invert an IP address for a DNS black list * | |
2480 | *************************************************/ | |
2481 | ||
2482 | /* | |
2483 | Arguments: | |
2484 | buffer where to put the answer | |
2485 | address the address to invert | |
2486 | */ | |
2487 | ||
2488 | static void | |
2489 | invert_address(uschar *buffer, uschar *address) | |
2490 | { | |
2491 | int bin[4]; | |
2492 | uschar *bptr = buffer; | |
2493 | ||
2494 | /* If this is an IPv4 address mapped into IPv6 format, adjust the pointer | |
2495 | to the IPv4 part only. */ | |
2496 | ||
2497 | if (Ustrncmp(address, "::ffff:", 7) == 0) address += 7; | |
2498 | ||
2499 | /* Handle IPv4 address: when HAVE_IPV6 is false, the result of host_aton() is | |
2500 | always 1. */ | |
2501 | ||
2502 | if (host_aton(address, bin) == 1) | |
2503 | { | |
2504 | int i; | |
2505 | int x = bin[0]; | |
2506 | for (i = 0; i < 4; i++) | |
2507 | { | |
2508 | sprintf(CS bptr, "%d.", x & 255); | |
2509 | while (*bptr) bptr++; | |
2510 | x >>= 8; | |
2511 | } | |
2512 | } | |
2513 | ||
2514 | /* Handle IPv6 address. Actually, as far as I know, there are no IPv6 addresses | |
2515 | in any DNS black lists, and the format in which they will be looked up is | |
2516 | unknown. This is just a guess. */ | |
2517 | ||
2518 | #if HAVE_IPV6 | |
2519 | else | |
2520 | { | |
2521 | int i, j; | |
2522 | for (j = 3; j >= 0; j--) | |
2523 | { | |
2524 | int x = bin[j]; | |
2525 | for (i = 0; i < 8; i++) | |
2526 | { | |
2527 | sprintf(CS bptr, "%x.", x & 15); | |
2528 | while (*bptr) bptr++; | |
2529 | x >>= 4; | |
2530 | } | |
2531 | } | |
2532 | } | |
2533 | #endif | |
d6f6e0dc PH |
2534 | |
2535 | /* Remove trailing period -- this is needed so that both arbitrary | |
2536 | dnsbl keydomains and inverted addresses may be combined with the | |
2537 | same format string, "%s.%s" */ | |
2538 | ||
2539 | *(--bptr) = 0; | |
059ec3d9 PH |
2540 | } |
2541 | ||
2542 | ||
2543 | ||
0bcb2a0e PH |
2544 | /************************************************* |
2545 | * Perform a single dnsbl lookup * | |
2546 | *************************************************/ | |
2547 | ||
d6f6e0dc PH |
2548 | /* This function is called from verify_check_dnsbl() below. It is also called |
2549 | recursively from within itself when domain and domain_txt are different | |
2550 | pointers, in order to get the TXT record from the alternate domain. | |
0bcb2a0e PH |
2551 | |
2552 | Arguments: | |
d6f6e0dc PH |
2553 | domain the outer dnsbl domain |
2554 | domain_txt alternate domain to lookup TXT record on success; when the | |
2555 | same domain is to be used, domain_txt == domain (that is, | |
2556 | the pointers must be identical, not just the text) | |
8e669ac1 | 2557 | keydomain the current keydomain (for debug message) |
d6f6e0dc PH |
2558 | prepend subdomain to lookup (like keydomain, but |
2559 | reversed if IP address) | |
2560 | iplist the list of matching IP addresses, or NULL for "any" | |
8e669ac1 | 2561 | bitmask true if bitmask matching is wanted |
431b7361 PH |
2562 | match_type condition for 'succeed' result |
2563 | 0 => Any RR in iplist (=) | |
2564 | 1 => No RR in iplist (!=) | |
2565 | 2 => All RRs in iplist (==) | |
2566 | 3 => Some RRs not in iplist (!==) | |
2567 | the two bits are defined as MT_NOT and MT_ALL | |
8e669ac1 | 2568 | defer_return what to return for a defer |
0bcb2a0e PH |
2569 | |
2570 | Returns: OK if lookup succeeded | |
2571 | FAIL if not | |
2572 | */ | |
2573 | ||
2574 | static int | |
d6f6e0dc | 2575 | one_check_dnsbl(uschar *domain, uschar *domain_txt, uschar *keydomain, |
431b7361 | 2576 | uschar *prepend, uschar *iplist, BOOL bitmask, int match_type, |
d6f6e0dc | 2577 | int defer_return) |
8e669ac1 | 2578 | { |
0bcb2a0e PH |
2579 | dns_answer dnsa; |
2580 | dns_scan dnss; | |
2581 | tree_node *t; | |
2582 | dnsbl_cache_block *cb; | |
2583 | int old_pool = store_pool; | |
d6f6e0dc PH |
2584 | uschar query[256]; /* DNS domain max length */ |
2585 | ||
2586 | /* Construct the specific query domainname */ | |
2587 | ||
2588 | if (!string_format(query, sizeof(query), "%s.%s", prepend, domain)) | |
2589 | { | |
2590 | log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long " | |
2591 | "(ignored): %s...", query); | |
2592 | return FAIL; | |
2593 | } | |
0bcb2a0e PH |
2594 | |
2595 | /* Look for this query in the cache. */ | |
2596 | ||
2597 | t = tree_search(dnsbl_cache, query); | |
2598 | ||
2599 | /* If not cached from a previous lookup, we must do a DNS lookup, and | |
2600 | cache the result in permanent memory. */ | |
2601 | ||
2602 | if (t == NULL) | |
2603 | { | |
2604 | store_pool = POOL_PERM; | |
2605 | ||
2606 | /* Set up a tree entry to cache the lookup */ | |
2607 | ||
2608 | t = store_get(sizeof(tree_node) + Ustrlen(query)); | |
2609 | Ustrcpy(t->name, query); | |
2610 | t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block)); | |
2611 | (void)tree_insertnode(&dnsbl_cache, t); | |
2612 | ||
2613 | /* Do the DNS loopup . */ | |
2614 | ||
2615 | HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query); | |
2616 | cb->rc = dns_basic_lookup(&dnsa, query, T_A); | |
2617 | cb->text_set = FALSE; | |
2618 | cb->text = NULL; | |
2619 | cb->rhs = NULL; | |
2620 | ||
2621 | /* If the lookup succeeded, cache the RHS address. The code allows for | |
2622 | more than one address - this was for complete generality and the possible | |
2623 | use of A6 records. However, A6 records have been reduced to experimental | |
2624 | status (August 2001) and may die out. So they may never get used at all, | |
2625 | let alone in dnsbl records. However, leave the code here, just in case. | |
2626 | ||
2627 | Quite apart from one A6 RR generating multiple addresses, there are DNS | |
2628 | lists that return more than one A record, so we must handle multiple | |
2629 | addresses generated in that way as well. */ | |
2630 | ||
2631 | if (cb->rc == DNS_SUCCEED) | |
2632 | { | |
2633 | dns_record *rr; | |
2634 | dns_address **addrp = &(cb->rhs); | |
2635 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
2636 | rr != NULL; | |
2637 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
2638 | { | |
2639 | if (rr->type == T_A) | |
2640 | { | |
2641 | dns_address *da = dns_address_from_rr(&dnsa, rr); | |
2642 | if (da != NULL) | |
2643 | { | |
2644 | *addrp = da; | |
2645 | while (da->next != NULL) da = da->next; | |
2646 | addrp = &(da->next); | |
2647 | } | |
2648 | } | |
2649 | } | |
2650 | ||
2651 | /* If we didn't find any A records, change the return code. This can | |
2652 | happen when there is a CNAME record but there are no A records for what | |
2653 | it points to. */ | |
2654 | ||
2655 | if (cb->rhs == NULL) cb->rc = DNS_NODATA; | |
2656 | } | |
2657 | ||
2658 | store_pool = old_pool; | |
2659 | } | |
2660 | ||
2661 | /* Previous lookup was cached */ | |
2662 | ||
2663 | else | |
2664 | { | |
2665 | HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n"); | |
2666 | cb = t->data.ptr; | |
2667 | } | |
2668 | ||
2669 | /* We now have the result of the DNS lookup, either newly done, or cached | |
2670 | from a previous call. If the lookup succeeded, check against the address | |
2671 | list if there is one. This may be a positive equality list (introduced by | |
2672 | "="), a negative equality list (introduced by "!="), a positive bitmask | |
2673 | list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/ | |
2674 | ||
2675 | if (cb->rc == DNS_SUCCEED) | |
2676 | { | |
2677 | dns_address *da = NULL; | |
2678 | uschar *addlist = cb->rhs->address; | |
2679 | ||
2680 | /* For A and AAAA records, there may be multiple addresses from multiple | |
2681 | records. For A6 records (currently not expected to be used) there may be | |
2682 | multiple addresses from a single record. */ | |
2683 | ||
2684 | for (da = cb->rhs->next; da != NULL; da = da->next) | |
2685 | addlist = string_sprintf("%s, %s", addlist, da->address); | |
2686 | ||
2687 | HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n", | |
2688 | query, addlist); | |
2689 | ||
2690 | /* Address list check; this can be either for equality, or via a bitmask. | |
2691 | In the latter case, all the bits must match. */ | |
2692 | ||
2693 | if (iplist != NULL) | |
2694 | { | |
431b7361 | 2695 | for (da = cb->rhs; da != NULL; da = da->next) |
0bcb2a0e | 2696 | { |
431b7361 PH |
2697 | int ipsep = ','; |
2698 | uschar ip[46]; | |
2699 | uschar *ptr = iplist; | |
2700 | uschar *res; | |
2701 | ||
0bcb2a0e | 2702 | /* Handle exact matching */ |
431b7361 | 2703 | |
0bcb2a0e PH |
2704 | if (!bitmask) |
2705 | { | |
431b7361 | 2706 | while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL) |
0bcb2a0e PH |
2707 | { |
2708 | if (Ustrcmp(CS da->address, ip) == 0) break; | |
2709 | } | |
2710 | } | |
431b7361 | 2711 | |
0bcb2a0e | 2712 | /* Handle bitmask matching */ |
431b7361 | 2713 | |
0bcb2a0e PH |
2714 | else |
2715 | { | |
2716 | int address[4]; | |
2717 | int mask = 0; | |
2718 | ||
2719 | /* At present, all known DNS blocking lists use A records, with | |
2720 | IPv4 addresses on the RHS encoding the information they return. I | |
2721 | wonder if this will linger on as the last vestige of IPv4 when IPv6 | |
2722 | is ubiquitous? Anyway, for now we use paranoia code to completely | |
2723 | ignore IPv6 addresses. The default mask is 0, which always matches. | |
2724 | We change this only for IPv4 addresses in the list. */ | |
2725 | ||
431b7361 | 2726 | if (host_aton(da->address, address) == 1) mask = address[0]; |
0bcb2a0e PH |
2727 | |
2728 | /* Scan the returned addresses, skipping any that are IPv6 */ | |
2729 | ||
431b7361 | 2730 | while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL) |
0bcb2a0e | 2731 | { |
431b7361 PH |
2732 | if (host_aton(ip, address) != 1) continue; |
2733 | if ((address[0] & mask) == address[0]) break; | |
0bcb2a0e PH |
2734 | } |
2735 | } | |
2736 | ||
431b7361 PH |
2737 | /* If either |
2738 | ||
2739 | (a) An IP address in an any ('=') list matched, or | |
2740 | (b) No IP address in an all ('==') list matched | |
0bcb2a0e | 2741 | |
431b7361 PH |
2742 | then we're done searching. */ |
2743 | ||
2744 | if (((match_type & MT_ALL) != 0) == (res == NULL)) break; | |
0bcb2a0e PH |
2745 | } |
2746 | ||
431b7361 | 2747 | /* If da == NULL, either |
0bcb2a0e | 2748 | |
431b7361 PH |
2749 | (a) No IP address in an any ('=') list matched, or |
2750 | (b) An IP address in an all ('==') list didn't match | |
0bcb2a0e | 2751 | |
431b7361 PH |
2752 | so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on |
2753 | the list. */ | |
0bcb2a0e | 2754 | |
431b7361 | 2755 | if ((match_type == MT_NOT || match_type == MT_ALL) != (da == NULL)) |
0bcb2a0e PH |
2756 | { |
2757 | HDEBUG(D_dnsbl) | |
2758 | { | |
431b7361 PH |
2759 | uschar *res = NULL; |
2760 | switch(match_type) | |
2761 | { | |
2762 | case 0: | |
2763 | res = US"was no match"; | |
2764 | break; | |
2765 | case MT_NOT: | |
2766 | res = US"was an exclude match"; | |
2767 | break; | |
2768 | case MT_ALL: | |
2769 | res = US"was an IP address that did not match"; | |
2770 | break; | |
2771 | case MT_NOT|MT_ALL: | |
2772 | res = US"were no IP addresses that did not match"; | |
2773 | break; | |
2774 | } | |
0bcb2a0e | 2775 | debug_printf("=> but we are not accepting this block class because\n"); |
431b7361 PH |
2776 | debug_printf("=> there %s for %s%c%s\n", |
2777 | res, | |
2778 | ((match_type & MT_ALL) == 0)? "" : "=", | |
2779 | bitmask? '&' : '=', iplist); | |
0bcb2a0e | 2780 | } |
8e669ac1 | 2781 | return FAIL; |
0bcb2a0e PH |
2782 | } |
2783 | } | |
2784 | ||
d6f6e0dc PH |
2785 | /* Either there was no IP list, or the record matched, implying that the |
2786 | domain is on the list. We now want to find a corresponding TXT record. If an | |
2787 | alternate domain is specified for the TXT record, call this function | |
2788 | recursively to look that up; this has the side effect of re-checking that | |
2789 | there is indeed an A record at the alternate domain. */ | |
2790 | ||
2791 | if (domain_txt != domain) | |
2792 | return one_check_dnsbl(domain_txt, domain_txt, keydomain, prepend, NULL, | |
431b7361 | 2793 | FALSE, match_type, defer_return); |
d6f6e0dc PH |
2794 | |
2795 | /* If there is no alternate domain, look up a TXT record in the main domain | |
2796 | if it has not previously been cached. */ | |
0bcb2a0e PH |
2797 | |
2798 | if (!cb->text_set) | |
2799 | { | |
2800 | cb->text_set = TRUE; | |
2801 | if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED) | |
2802 | { | |
2803 | dns_record *rr; | |
2804 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
2805 | rr != NULL; | |
2806 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
2807 | if (rr->type == T_TXT) break; | |
2808 | if (rr != NULL) | |
2809 | { | |
2810 | int len = (rr->data)[0]; | |
2811 | if (len > 511) len = 127; | |
2812 | store_pool = POOL_PERM; | |
2813 | cb->text = string_sprintf("%.*s", len, (const uschar *)(rr->data+1)); | |
2814 | store_pool = old_pool; | |
2815 | } | |
2816 | } | |
2817 | } | |
2818 | ||
2819 | dnslist_value = addlist; | |
2820 | dnslist_text = cb->text; | |
2821 | return OK; | |
2822 | } | |
2823 | ||
2824 | /* There was a problem with the DNS lookup */ | |
2825 | ||
2826 | if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA) | |
2827 | { | |
2828 | log_write(L_dnslist_defer, LOG_MAIN, | |
2829 | "DNS list lookup defer (probably timeout) for %s: %s", query, | |
2830 | (defer_return == OK)? US"assumed in list" : | |
2831 | (defer_return == FAIL)? US"assumed not in list" : | |
2832 | US"returned DEFER"); | |
2833 | return defer_return; | |
2834 | } | |
2835 | ||
2836 | /* No entry was found in the DNS; continue for next domain */ | |
2837 | ||
2838 | HDEBUG(D_dnsbl) | |
2839 | { | |
2840 | debug_printf("DNS lookup for %s failed\n", query); | |
2841 | debug_printf("=> that means %s is not listed at %s\n", | |
2842 | keydomain, domain); | |
2843 | } | |
2844 | ||
2845 | return FAIL; | |
2846 | } | |
2847 | ||
2848 | ||
2849 | ||
2850 | ||
059ec3d9 PH |
2851 | /************************************************* |
2852 | * Check host against DNS black lists * | |
2853 | *************************************************/ | |
2854 | ||
2855 | /* This function runs checks against a list of DNS black lists, until one | |
2856 | matches. Each item on the list can be of the form | |
2857 | ||
2858 | domain=ip-address/key | |
2859 | ||
2860 | The domain is the right-most domain that is used for the query, for example, | |
2861 | blackholes.mail-abuse.org. If the IP address is present, there is a match only | |
2862 | if the DNS lookup returns a matching IP address. Several addresses may be | |
2863 | given, comma-separated, for example: x.y.z=127.0.0.1,127.0.0.2. | |
2864 | ||
2865 | If no key is given, what is looked up in the domain is the inverted IP address | |
2866 | of the current client host. If a key is given, it is used to construct the | |
d6f6e0dc | 2867 | domain for the lookup. For example: |
059ec3d9 PH |
2868 | |
2869 | dsn.rfc-ignorant.org/$sender_address_domain | |
2870 | ||
2871 | After finding a match in the DNS, the domain is placed in $dnslist_domain, and | |
2872 | then we check for a TXT record for an error message, and if found, save its | |
2873 | value in $dnslist_text. We also cache everything in a tree, to optimize | |
2874 | multiple lookups. | |
2875 | ||
d6f6e0dc PH |
2876 | The TXT record is normally looked up in the same domain as the A record, but |
2877 | when many lists are combined in a single DNS domain, this will not be a very | |
2878 | specific message. It is possible to specify a different domain for looking up | |
2879 | TXT records; this is given before the main domain, comma-separated. For | |
2880 | example: | |
2881 | ||
2882 | dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \ | |
2883 | socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3 | |
2884 | ||
2885 | The caching ensures that only one lookup in dnsbl.sorbs.net is done. | |
2886 | ||
059ec3d9 PH |
2887 | Note: an address for testing RBL is 192.203.178.39 |
2888 | Note: an address for testing DUL is 192.203.178.4 | |
2889 | Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org | |
2890 | ||
2891 | Arguments: | |
2892 | listptr the domain/address/data list | |
2893 | ||
2894 | Returns: OK successful lookup (i.e. the address is on the list), or | |
2895 | lookup deferred after +include_unknown | |
2896 | FAIL name not found, or no data found for the given type, or | |
2897 | lookup deferred after +exclude_unknown (default) | |
2898 | DEFER lookup failure, if +defer_unknown was set | |
2899 | */ | |
2900 | ||
2901 | int | |
2902 | verify_check_dnsbl(uschar **listptr) | |
2903 | { | |
2904 | int sep = 0; | |
2905 | int defer_return = FAIL; | |
059ec3d9 PH |
2906 | uschar *list = *listptr; |
2907 | uschar *domain; | |
2908 | uschar *s; | |
2909 | uschar buffer[1024]; | |
059ec3d9 PH |
2910 | uschar revadd[128]; /* Long enough for IPv6 address */ |
2911 | ||
2912 | /* Indicate that the inverted IP address is not yet set up */ | |
2913 | ||
2914 | revadd[0] = 0; | |
2915 | ||
0bcb2a0e PH |
2916 | /* In case this is the first time the DNS resolver is being used. */ |
2917 | ||
2918 | dns_init(FALSE, FALSE); | |
2919 | ||
059ec3d9 PH |
2920 | /* Loop through all the domains supplied, until something matches */ |
2921 | ||
2922 | while ((domain = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL) | |
2923 | { | |
0bcb2a0e | 2924 | int rc; |
059ec3d9 | 2925 | BOOL bitmask = FALSE; |
431b7361 | 2926 | int match_type = 0; |
d6f6e0dc PH |
2927 | uschar *domain_txt; |
2928 | uschar *comma; | |
059ec3d9 PH |
2929 | uschar *iplist; |
2930 | uschar *key; | |
059ec3d9 PH |
2931 | |
2932 | HDEBUG(D_dnsbl) debug_printf("DNS list check: %s\n", domain); | |
2933 | ||
2934 | /* Deal with special values that change the behaviour on defer */ | |
2935 | ||
2936 | if (domain[0] == '+') | |
2937 | { | |
2938 | if (strcmpic(domain, US"+include_unknown") == 0) defer_return = OK; | |
2939 | else if (strcmpic(domain, US"+exclude_unknown") == 0) defer_return = FAIL; | |
2940 | else if (strcmpic(domain, US"+defer_unknown") == 0) defer_return = DEFER; | |
2941 | else | |
2942 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown item in dnslist (ignored): %s", | |
2943 | domain); | |
2944 | continue; | |
2945 | } | |
2946 | ||
2947 | /* See if there's explicit data to be looked up */ | |
2948 | ||
2949 | key = Ustrchr(domain, '/'); | |
2950 | if (key != NULL) *key++ = 0; | |
2951 | ||
2952 | /* See if there's a list of addresses supplied after the domain name. This is | |
431b7361 PH |
2953 | introduced by an = or a & character; if preceded by = we require all matches |
2954 | and if preceded by ! we invert the result. */ | |
059ec3d9 PH |
2955 | |
2956 | iplist = Ustrchr(domain, '='); | |
2957 | if (iplist == NULL) | |
2958 | { | |
2959 | bitmask = TRUE; | |
2960 | iplist = Ustrchr(domain, '&'); | |
2961 | } | |
2962 | ||
431b7361 | 2963 | if (iplist != NULL) /* Found either = or & */ |
059ec3d9 | 2964 | { |
431b7361 | 2965 | if (iplist > domain && iplist[-1] == '!') /* Handle preceding ! */ |
059ec3d9 | 2966 | { |
431b7361 | 2967 | match_type |= MT_NOT; |
059ec3d9 PH |
2968 | iplist[-1] = 0; |
2969 | } | |
431b7361 PH |
2970 | |
2971 | *iplist++ = 0; /* Terminate domain, move on */ | |
2972 | ||
2973 | /* If we found = (bitmask == FALSE), check for == or =& */ | |
2974 | ||
2975 | if (!bitmask && (*iplist == '=' || *iplist == '&')) | |
2976 | { | |
2977 | bitmask = *iplist++ == '&'; | |
2978 | match_type |= MT_ALL; | |
2979 | } | |
059ec3d9 PH |
2980 | } |
2981 | ||
d6f6e0dc PH |
2982 | /* If there is a comma in the domain, it indicates that a second domain for |
2983 | looking up TXT records is provided, before the main domain. Otherwise we must | |
2984 | set domain_txt == domain. */ | |
2985 | ||
2986 | domain_txt = domain; | |
2987 | comma = Ustrchr(domain, ','); | |
2988 | if (comma != NULL) | |
2989 | { | |
2990 | *comma++ = 0; | |
2991 | domain = comma; | |
2992 | } | |
2993 | ||
059ec3d9 PH |
2994 | /* Check that what we have left is a sensible domain name. There is no reason |
2995 | why these domains should in fact use the same syntax as hosts and email | |
2996 | domains, but in practice they seem to. However, there is little point in | |
2997 | actually causing an error here, because that would no doubt hold up incoming | |
2998 | mail. Instead, I'll just log it. */ | |
2999 | ||
3000 | for (s = domain; *s != 0; s++) | |
3001 | { | |
3002 | if (!isalnum(*s) && *s != '-' && *s != '.') | |
3003 | { | |
3004 | log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains " | |
3005 | "strange characters - is this right?", domain); | |
3006 | break; | |
3007 | } | |
3008 | } | |
3009 | ||
d6f6e0dc PH |
3010 | /* Check the alternate domain if present */ |
3011 | ||
3012 | if (domain_txt != domain) for (s = domain_txt; *s != 0; s++) | |
3013 | { | |
3014 | if (!isalnum(*s) && *s != '-' && *s != '.') | |
3015 | { | |
3016 | log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains " | |
3017 | "strange characters - is this right?", domain_txt); | |
3018 | break; | |
3019 | } | |
3020 | } | |
3021 | ||
8e669ac1 | 3022 | /* If there is no key string, construct the query by adding the domain name |
0bcb2a0e | 3023 | onto the inverted host address, and perform a single DNS lookup. */ |
8e669ac1 | 3024 | |
059ec3d9 PH |
3025 | if (key == NULL) |
3026 | { | |
3027 | if (sender_host_address == NULL) return FAIL; /* can never match */ | |
3028 | if (revadd[0] == 0) invert_address(revadd, sender_host_address); | |
d6f6e0dc | 3029 | rc = one_check_dnsbl(domain, domain_txt, sender_host_address, revadd, |
431b7361 | 3030 | iplist, bitmask, match_type, defer_return); |
0bcb2a0e PH |
3031 | if (rc == OK) |
3032 | { | |
d6f6e0dc | 3033 | dnslist_domain = string_copy(domain_txt); |
93655c46 | 3034 | dnslist_matched = string_copy(sender_host_address); |
8e669ac1 | 3035 | HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n", |
d6f6e0dc | 3036 | sender_host_address, dnslist_domain); |
0bcb2a0e | 3037 | } |
0bcb2a0e | 3038 | if (rc != FAIL) return rc; /* OK or DEFER */ |
059ec3d9 | 3039 | } |
8e669ac1 PH |
3040 | |
3041 | /* If there is a key string, it can be a list of domains or IP addresses to | |
0bcb2a0e | 3042 | be concatenated with the main domain. */ |
8e669ac1 | 3043 | |
059ec3d9 PH |
3044 | else |
3045 | { | |
0bcb2a0e | 3046 | int keysep = 0; |
8e669ac1 PH |
3047 | BOOL defer = FALSE; |
3048 | uschar *keydomain; | |
0bcb2a0e | 3049 | uschar keybuffer[256]; |
d6f6e0dc | 3050 | uschar keyrevadd[128]; |
8e669ac1 PH |
3051 | |
3052 | while ((keydomain = string_nextinlist(&key, &keysep, keybuffer, | |
0bcb2a0e | 3053 | sizeof(keybuffer))) != NULL) |
8e669ac1 | 3054 | { |
d6f6e0dc PH |
3055 | uschar *prepend = keydomain; |
3056 | ||
7e66e54d | 3057 | if (string_is_ip_address(keydomain, NULL) != 0) |
059ec3d9 | 3058 | { |
0bcb2a0e | 3059 | invert_address(keyrevadd, keydomain); |
d6f6e0dc | 3060 | prepend = keyrevadd; |
059ec3d9 | 3061 | } |
8e669ac1 | 3062 | |
d6f6e0dc | 3063 | rc = one_check_dnsbl(domain, domain_txt, keydomain, prepend, iplist, |
431b7361 | 3064 | bitmask, match_type, defer_return); |
8e669ac1 | 3065 | |
0bcb2a0e | 3066 | if (rc == OK) |
059ec3d9 | 3067 | { |
d6f6e0dc | 3068 | dnslist_domain = string_copy(domain_txt); |
93655c46 | 3069 | dnslist_matched = string_copy(keydomain); |
8e669ac1 | 3070 | HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n", |
d6f6e0dc | 3071 | keydomain, dnslist_domain); |
8e669ac1 | 3072 | return OK; |
059ec3d9 | 3073 | } |
8e669ac1 | 3074 | |
c38d6da9 PH |
3075 | /* If the lookup deferred, remember this fact. We keep trying the rest |
3076 | of the list to see if we get a useful result, and if we don't, we return | |
3077 | DEFER at the end. */ | |
059ec3d9 | 3078 | |
c38d6da9 | 3079 | if (rc == DEFER) defer = TRUE; |
0bcb2a0e | 3080 | } /* continue with next keystring domain/address */ |
c38d6da9 PH |
3081 | |
3082 | if (defer) return DEFER; | |
8e669ac1 | 3083 | } |
0bcb2a0e | 3084 | } /* continue with next dnsdb outer domain */ |
059ec3d9 PH |
3085 | |
3086 | return FAIL; | |
3087 | } | |
3088 | ||
3089 | /* End of verify.c */ |