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322050c2 | 1 | /* $Cambridge: exim/src/src/verify.c,v 1.42 2006/10/09 14:36:25 ph10 Exp $ */ |
059ec3d9 PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
d7d7b7b9 | 7 | /* Copyright (c) University of Cambridge 1995 - 2006 */ |
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 | ||
32 | ||
33 | /************************************************* | |
34 | * Retrieve a callout cache record * | |
35 | *************************************************/ | |
36 | ||
37 | /* If a record exists, check whether it has expired. | |
38 | ||
39 | Arguments: | |
40 | dbm_file an open hints file | |
41 | key the record key | |
42 | type "address" or "domain" | |
43 | positive_expire expire time for positive records | |
44 | negative_expire expire time for negative records | |
45 | ||
46 | Returns: the cache record if a non-expired one exists, else NULL | |
47 | */ | |
48 | ||
49 | static dbdata_callout_cache * | |
50 | get_callout_cache_record(open_db *dbm_file, uschar *key, uschar *type, | |
51 | int positive_expire, int negative_expire) | |
52 | { | |
53 | BOOL negative; | |
54 | int length, expire; | |
55 | time_t now; | |
56 | dbdata_callout_cache *cache_record; | |
57 | ||
58 | cache_record = dbfn_read_with_length(dbm_file, key, &length); | |
59 | ||
60 | if (cache_record == NULL) | |
61 | { | |
62 | HDEBUG(D_verify) debug_printf("callout cache: no %s record found\n", type); | |
63 | return NULL; | |
64 | } | |
65 | ||
66 | /* We treat a record as "negative" if its result field is not positive, or if | |
67 | it is a domain record and the postmaster field is negative. */ | |
68 | ||
69 | negative = cache_record->result != ccache_accept || | |
70 | (type[0] == 'd' && cache_record->postmaster_result == ccache_reject); | |
71 | expire = negative? negative_expire : positive_expire; | |
72 | now = time(NULL); | |
73 | ||
74 | if (now - cache_record->time_stamp > expire) | |
75 | { | |
76 | HDEBUG(D_verify) debug_printf("callout cache: %s record expired\n", type); | |
77 | return NULL; | |
78 | } | |
79 | ||
80 | /* If this is a non-reject domain record, check for the obsolete format version | |
81 | that doesn't have the postmaster and random timestamps, by looking at the | |
82 | length. If so, copy it to a new-style block, replicating the record's | |
83 | timestamp. Then check the additional timestamps. (There's no point wasting | |
84 | effort if connections are rejected.) */ | |
85 | ||
86 | if (type[0] == 'd' && cache_record->result != ccache_reject) | |
87 | { | |
88 | if (length == sizeof(dbdata_callout_cache_obs)) | |
89 | { | |
90 | dbdata_callout_cache *new = store_get(sizeof(dbdata_callout_cache)); | |
91 | memcpy(new, cache_record, length); | |
92 | new->postmaster_stamp = new->random_stamp = new->time_stamp; | |
93 | cache_record = new; | |
94 | } | |
95 | ||
96 | if (now - cache_record->postmaster_stamp > expire) | |
97 | cache_record->postmaster_result = ccache_unknown; | |
98 | ||
99 | if (now - cache_record->random_stamp > expire) | |
100 | cache_record->random_result = ccache_unknown; | |
101 | } | |
102 | ||
103 | HDEBUG(D_verify) debug_printf("callout cache: found %s record\n", type); | |
104 | return cache_record; | |
105 | } | |
106 | ||
107 | ||
108 | ||
109 | /************************************************* | |
110 | * Do callout verification for an address * | |
111 | *************************************************/ | |
112 | ||
113 | /* This function is called from verify_address() when the address has routed to | |
114 | a host list, and a callout has been requested. Callouts are expensive; that is | |
115 | why a cache is used to improve the efficiency. | |
116 | ||
117 | Arguments: | |
118 | addr the address that's been routed | |
119 | host_list the list of hosts to try | |
120 | tf the transport feedback block | |
121 | ||
122 | ifstring "interface" option from transport, or NULL | |
123 | portstring "port" option from transport, or NULL | |
124 | protocolstring "protocol" option from transport, or NULL | |
125 | callout the per-command callout timeout | |
4deaf07d PH |
126 | callout_overall the overall callout timeout (if < 0 use 4*callout) |
127 | callout_connect the callout connection timeout (if < 0 use callout) | |
059ec3d9 PH |
128 | options the verification options - these bits are used: |
129 | vopt_is_recipient => this is a recipient address | |
130 | vopt_callout_no_cache => don't use callout cache | |
2a4be8f9 | 131 | vopt_callout_fullpm => if postmaster check, do full one |
059ec3d9 PH |
132 | vopt_callout_random => do the "random" thing |
133 | vopt_callout_recipsender => use real sender for recipient | |
134 | vopt_callout_recippmaster => use postmaster for recipient | |
135 | se_mailfrom MAIL FROM address for sender verify; NULL => "" | |
136 | pm_mailfrom if non-NULL, do the postmaster check with this sender | |
137 | ||
138 | Returns: OK/FAIL/DEFER | |
139 | */ | |
140 | ||
141 | static int | |
142 | do_callout(address_item *addr, host_item *host_list, transport_feedback *tf, | |
8e669ac1 | 143 | int callout, int callout_overall, int callout_connect, int options, |
4deaf07d | 144 | uschar *se_mailfrom, uschar *pm_mailfrom) |
059ec3d9 PH |
145 | { |
146 | BOOL is_recipient = (options & vopt_is_recipient) != 0; | |
147 | BOOL callout_no_cache = (options & vopt_callout_no_cache) != 0; | |
148 | BOOL callout_random = (options & vopt_callout_random) != 0; | |
149 | ||
150 | int yield = OK; | |
2b1c6e3a | 151 | int old_domain_cache_result = ccache_accept; |
059ec3d9 PH |
152 | BOOL done = FALSE; |
153 | uschar *address_key; | |
154 | uschar *from_address; | |
155 | uschar *random_local_part = NULL; | |
750af86e | 156 | uschar *save_deliver_domain = deliver_domain; |
8e669ac1 | 157 | uschar **failure_ptr = is_recipient? |
2c7db3f5 | 158 | &recipient_verify_failure : &sender_verify_failure; |
059ec3d9 PH |
159 | open_db dbblock; |
160 | open_db *dbm_file = NULL; | |
161 | dbdata_callout_cache new_domain_record; | |
162 | dbdata_callout_cache_address new_address_record; | |
163 | host_item *host; | |
164 | time_t callout_start_time; | |
165 | ||
166 | new_domain_record.result = ccache_unknown; | |
167 | new_domain_record.postmaster_result = ccache_unknown; | |
168 | new_domain_record.random_result = ccache_unknown; | |
169 | ||
170 | memset(&new_address_record, 0, sizeof(new_address_record)); | |
171 | ||
172 | /* For a recipient callout, the key used for the address cache record must | |
173 | include the sender address if we are using the real sender in the callout, | |
174 | because that may influence the result of the callout. */ | |
175 | ||
176 | address_key = addr->address; | |
177 | from_address = US""; | |
178 | ||
179 | if (is_recipient) | |
180 | { | |
181 | if ((options & vopt_callout_recipsender) != 0) | |
182 | { | |
183 | address_key = string_sprintf("%s/<%s>", addr->address, sender_address); | |
184 | from_address = sender_address; | |
185 | } | |
186 | else if ((options & vopt_callout_recippmaster) != 0) | |
187 | { | |
188 | address_key = string_sprintf("%s/<postmaster@%s>", addr->address, | |
189 | qualify_domain_sender); | |
190 | from_address = string_sprintf("postmaster@%s", qualify_domain_sender); | |
191 | } | |
192 | } | |
193 | ||
194 | /* For a sender callout, we must adjust the key if the mailfrom address is not | |
195 | empty. */ | |
196 | ||
197 | else | |
198 | { | |
199 | from_address = (se_mailfrom == NULL)? US"" : se_mailfrom; | |
200 | if (from_address[0] != 0) | |
201 | address_key = string_sprintf("%s/<%s>", addr->address, from_address); | |
202 | } | |
203 | ||
204 | /* Open the callout cache database, it it exists, for reading only at this | |
205 | stage, unless caching has been disabled. */ | |
206 | ||
207 | if (callout_no_cache) | |
208 | { | |
209 | HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n"); | |
210 | } | |
211 | else if ((dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE)) == NULL) | |
212 | { | |
213 | HDEBUG(D_verify) debug_printf("callout cache: not available\n"); | |
214 | } | |
215 | ||
216 | /* If a cache database is available see if we can avoid the need to do an | |
217 | actual callout by making use of previously-obtained data. */ | |
218 | ||
219 | if (dbm_file != NULL) | |
220 | { | |
221 | dbdata_callout_cache_address *cache_address_record; | |
222 | dbdata_callout_cache *cache_record = get_callout_cache_record(dbm_file, | |
223 | addr->domain, US"domain", | |
224 | callout_cache_domain_positive_expire, | |
225 | callout_cache_domain_negative_expire); | |
226 | ||
227 | /* If an unexpired cache record was found for this domain, see if the callout | |
228 | process can be short-circuited. */ | |
229 | ||
230 | if (cache_record != NULL) | |
231 | { | |
2b1c6e3a PH |
232 | /* In most cases, if an early command (up to and including MAIL FROM:<>) |
233 | was rejected, there is no point carrying on. The callout fails. However, if | |
234 | we are doing a recipient verification with use_sender or use_postmaster | |
235 | set, a previous failure of MAIL FROM:<> doesn't count, because this time we | |
236 | will be using a non-empty sender. We have to remember this situation so as | |
237 | not to disturb the cached domain value if this whole verification succeeds | |
238 | (we don't want it turning into "accept"). */ | |
239 | ||
240 | old_domain_cache_result = cache_record->result; | |
241 | ||
242 | if (cache_record->result == ccache_reject || | |
243 | (*from_address == 0 && cache_record->result == ccache_reject_mfnull)) | |
059ec3d9 PH |
244 | { |
245 | setflag(addr, af_verify_nsfail); | |
246 | HDEBUG(D_verify) | |
247 | debug_printf("callout cache: domain gave initial rejection, or " | |
248 | "does not accept HELO or MAIL FROM:<>\n"); | |
249 | setflag(addr, af_verify_nsfail); | |
250 | addr->user_message = US"(result of an earlier callout reused)."; | |
251 | yield = FAIL; | |
8e669ac1 | 252 | *failure_ptr = US"mail"; |
059ec3d9 PH |
253 | goto END_CALLOUT; |
254 | } | |
255 | ||
256 | /* If a previous check on a "random" local part was accepted, we assume | |
257 | that the server does not do any checking on local parts. There is therefore | |
258 | no point in doing the callout, because it will always be successful. If a | |
259 | random check previously failed, arrange not to do it again, but preserve | |
260 | the data in the new record. If a random check is required but hasn't been | |
261 | done, skip the remaining cache processing. */ | |
262 | ||
263 | if (callout_random) switch(cache_record->random_result) | |
264 | { | |
265 | case ccache_accept: | |
266 | HDEBUG(D_verify) | |
267 | debug_printf("callout cache: domain accepts random addresses\n"); | |
268 | goto END_CALLOUT; /* Default yield is OK */ | |
269 | ||
270 | case ccache_reject: | |
271 | HDEBUG(D_verify) | |
272 | debug_printf("callout cache: domain rejects random addresses\n"); | |
273 | callout_random = FALSE; | |
274 | new_domain_record.random_result = ccache_reject; | |
275 | new_domain_record.random_stamp = cache_record->random_stamp; | |
276 | break; | |
277 | ||
278 | default: | |
279 | HDEBUG(D_verify) | |
280 | debug_printf("callout cache: need to check random address handling " | |
281 | "(not cached or cache expired)\n"); | |
282 | goto END_CACHE; | |
283 | } | |
284 | ||
285 | /* If a postmaster check is requested, but there was a previous failure, | |
286 | there is again no point in carrying on. If a postmaster check is required, | |
287 | but has not been done before, we are going to have to do a callout, so skip | |
288 | remaining cache processing. */ | |
289 | ||
290 | if (pm_mailfrom != NULL) | |
291 | { | |
292 | if (cache_record->postmaster_result == ccache_reject) | |
293 | { | |
294 | setflag(addr, af_verify_pmfail); | |
295 | HDEBUG(D_verify) | |
296 | debug_printf("callout cache: domain does not accept " | |
297 | "RCPT TO:<postmaster@domain>\n"); | |
298 | yield = FAIL; | |
8e669ac1 | 299 | *failure_ptr = US"postmaster"; |
059ec3d9 PH |
300 | setflag(addr, af_verify_pmfail); |
301 | addr->user_message = US"(result of earlier verification reused)."; | |
302 | goto END_CALLOUT; | |
303 | } | |
304 | if (cache_record->postmaster_result == ccache_unknown) | |
305 | { | |
306 | HDEBUG(D_verify) | |
307 | debug_printf("callout cache: need to check RCPT " | |
308 | "TO:<postmaster@domain> (not cached or cache expired)\n"); | |
309 | goto END_CACHE; | |
310 | } | |
311 | ||
312 | /* If cache says OK, set pm_mailfrom NULL to prevent a redundant | |
313 | postmaster check if the address itself has to be checked. Also ensure | |
314 | that the value in the cache record is preserved (with its old timestamp). | |
315 | */ | |
316 | ||
317 | HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT " | |
318 | "TO:<postmaster@domain>\n"); | |
319 | pm_mailfrom = NULL; | |
320 | new_domain_record.postmaster_result = ccache_accept; | |
321 | new_domain_record.postmaster_stamp = cache_record->postmaster_stamp; | |
322 | } | |
323 | } | |
324 | ||
325 | /* We can't give a result based on information about the domain. See if there | |
326 | is an unexpired cache record for this specific address (combined with the | |
327 | sender address if we are doing a recipient callout with a non-empty sender). | |
328 | */ | |
329 | ||
330 | cache_address_record = (dbdata_callout_cache_address *) | |
331 | get_callout_cache_record(dbm_file, | |
332 | address_key, US"address", | |
333 | callout_cache_positive_expire, | |
334 | callout_cache_negative_expire); | |
335 | ||
336 | if (cache_address_record != NULL) | |
337 | { | |
338 | if (cache_address_record->result == ccache_accept) | |
339 | { | |
340 | HDEBUG(D_verify) | |
341 | debug_printf("callout cache: address record is positive\n"); | |
342 | } | |
343 | else | |
344 | { | |
345 | HDEBUG(D_verify) | |
346 | debug_printf("callout cache: address record is negative\n"); | |
347 | addr->user_message = US"Previous (cached) callout verification failure"; | |
8e669ac1 | 348 | *failure_ptr = US"recipient"; |
059ec3d9 PH |
349 | yield = FAIL; |
350 | } | |
351 | goto END_CALLOUT; | |
352 | } | |
353 | ||
354 | /* Close the cache database while we actually do the callout for real. */ | |
355 | ||
356 | END_CACHE: | |
357 | dbfn_close(dbm_file); | |
358 | dbm_file = NULL; | |
359 | } | |
360 | ||
361 | /* The information wasn't available in the cache, so we have to do a real | |
362 | callout and save the result in the cache for next time, unless no_cache is set, | |
363 | or unless we have a previously cached negative random result. If we are to test | |
364 | with a random local part, ensure that such a local part is available. If not, | |
365 | log the fact, but carry on without randomming. */ | |
366 | ||
367 | if (callout_random && callout_random_local_part != NULL) | |
368 | { | |
369 | random_local_part = expand_string(callout_random_local_part); | |
370 | if (random_local_part == NULL) | |
371 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand " | |
372 | "callout_random_local_part: %s", expand_string_message); | |
373 | } | |
374 | ||
4deaf07d PH |
375 | /* Default the connect and overall callout timeouts if not set, and record the |
376 | time we are starting so that we can enforce it. */ | |
059ec3d9 PH |
377 | |
378 | if (callout_overall < 0) callout_overall = 4 * callout; | |
4deaf07d | 379 | if (callout_connect < 0) callout_connect = callout; |
059ec3d9 PH |
380 | callout_start_time = time(NULL); |
381 | ||
382 | /* Now make connections to the hosts and do real callouts. The list of hosts | |
383 | is passed in as an argument. */ | |
384 | ||
385 | for (host = host_list; host != NULL && !done; host = host->next) | |
386 | { | |
387 | smtp_inblock inblock; | |
388 | smtp_outblock outblock; | |
389 | int host_af; | |
390 | int port = 25; | |
8e669ac1 | 391 | BOOL send_quit = TRUE; |
26da7e20 | 392 | uschar *active_hostname = smtp_active_hostname; |
059ec3d9 PH |
393 | uschar *helo = US"HELO"; |
394 | uschar *interface = NULL; /* Outgoing interface to use; NULL => any */ | |
395 | uschar inbuffer[4096]; | |
396 | uschar outbuffer[1024]; | |
397 | uschar responsebuffer[4096]; | |
398 | ||
399 | clearflag(addr, af_verify_pmfail); /* postmaster callout flag */ | |
400 | clearflag(addr, af_verify_nsfail); /* null sender callout flag */ | |
401 | ||
402 | /* Skip this host if we don't have an IP address for it. */ | |
403 | ||
404 | if (host->address == NULL) | |
405 | { | |
406 | DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n", | |
407 | host->name); | |
408 | continue; | |
409 | } | |
410 | ||
411 | /* Check the overall callout timeout */ | |
412 | ||
413 | if (time(NULL) - callout_start_time >= callout_overall) | |
414 | { | |
415 | HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n"); | |
416 | break; | |
417 | } | |
418 | ||
419 | /* Set IPv4 or IPv6 */ | |
420 | ||
421 | host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6; | |
422 | ||
de3a88fb PH |
423 | /* Expand and interpret the interface and port strings. The latter will not |
424 | be used if there is a host-specific port (e.g. from a manualroute router). | |
425 | This has to be delayed till now, because they may expand differently for | |
426 | different hosts. If there's a failure, log it, but carry on with the | |
427 | defaults. */ | |
059ec3d9 PH |
428 | |
429 | deliver_host = host->name; | |
430 | deliver_host_address = host->address; | |
750af86e | 431 | deliver_domain = addr->domain; |
de3a88fb | 432 | |
059ec3d9 PH |
433 | if (!smtp_get_interface(tf->interface, host_af, addr, NULL, &interface, |
434 | US"callout") || | |
435 | !smtp_get_port(tf->port, addr, &port, US"callout")) | |
436 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address, | |
437 | addr->message); | |
de3a88fb | 438 | |
26da7e20 PH |
439 | /* Expand the helo_data string to find the host name to use. */ |
440 | ||
441 | if (tf->helo_data != NULL) | |
442 | { | |
443 | uschar *s = expand_string(tf->helo_data); | |
444 | if (active_hostname == NULL) | |
445 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: failed to expand transport's " | |
446 | "helo_data value for callout: %s", expand_string_message); | |
447 | else active_hostname = s; | |
448 | } | |
449 | ||
059ec3d9 | 450 | deliver_host = deliver_host_address = NULL; |
750af86e | 451 | deliver_domain = save_deliver_domain; |
059ec3d9 PH |
452 | |
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)); | |
483 | continue; | |
484 | } | |
485 | ||
2b1c6e3a PH |
486 | /* Wait for initial response, and send HELO. The smtp_write_command() |
487 | function leaves its command in big_buffer. This is used in error responses. | |
488 | Initialize it in case the connection is rejected. */ | |
059ec3d9 PH |
489 | |
490 | Ustrcpy(big_buffer, "initial connection"); | |
491 | ||
492 | done = | |
493 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), | |
494 | '2', callout) && | |
059ec3d9 | 495 | smtp_write_command(&outblock, FALSE, "%s %s\r\n", helo, |
26da7e20 | 496 | active_hostname) >= 0 && |
059ec3d9 | 497 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), |
2b1c6e3a | 498 | '2', callout); |
059ec3d9 | 499 | |
2b1c6e3a PH |
500 | /* Failure to accept HELO is cached; this blocks the whole domain for all |
501 | senders. I/O errors and defer responses are not cached. */ | |
502 | ||
503 | if (!done) | |
504 | { | |
505 | *failure_ptr = US"mail"; /* At or before MAIL */ | |
506 | if (errno == 0 && responsebuffer[0] == '5') | |
507 | { | |
508 | setflag(addr, af_verify_nsfail); | |
509 | new_domain_record.result = ccache_reject; | |
510 | } | |
511 | } | |
512 | ||
513 | /* Send the MAIL command */ | |
514 | ||
515 | else done = | |
059ec3d9 PH |
516 | smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n", |
517 | from_address) >= 0 && | |
518 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), | |
519 | '2', callout); | |
520 | ||
2b1c6e3a PH |
521 | /* If the host does not accept MAIL FROM:<>, arrange to cache this |
522 | information, but again, don't record anything for an I/O error or a defer. Do | |
523 | not cache rejections of MAIL when a non-empty sender has been used, because | |
524 | that blocks the whole domain for all senders. */ | |
059ec3d9 PH |
525 | |
526 | if (!done) | |
527 | { | |
2b1c6e3a | 528 | *failure_ptr = US"mail"; /* At or before MAIL */ |
059ec3d9 PH |
529 | if (errno == 0 && responsebuffer[0] == '5') |
530 | { | |
531 | setflag(addr, af_verify_nsfail); | |
2b1c6e3a PH |
532 | if (from_address[0] == 0) |
533 | new_domain_record.result = ccache_reject_mfnull; | |
059ec3d9 PH |
534 | } |
535 | } | |
536 | ||
537 | /* Otherwise, proceed to check a "random" address (if required), then the | |
538 | given address, and the postmaster address (if required). Between each check, | |
539 | issue RSET, because some servers accept only one recipient after MAIL | |
2b1c6e3a PH |
540 | FROM:<>. |
541 | ||
542 | Before doing this, set the result in the domain cache record to "accept", | |
543 | unless its previous value was ccache_reject_mfnull. In that case, the domain | |
544 | rejects MAIL FROM:<> and we want to continue to remember that. When that is | |
545 | the case, we have got here only in the case of a recipient verification with | |
546 | a non-null sender. */ | |
059ec3d9 PH |
547 | |
548 | else | |
549 | { | |
2b1c6e3a PH |
550 | new_domain_record.result = |
551 | (old_domain_cache_result == ccache_reject_mfnull)? | |
552 | ccache_reject_mfnull: ccache_accept; | |
059ec3d9 PH |
553 | |
554 | /* Do the random local part check first */ | |
555 | ||
556 | if (random_local_part != NULL) | |
557 | { | |
558 | uschar randombuffer[1024]; | |
559 | BOOL random_ok = | |
560 | smtp_write_command(&outblock, FALSE, | |
561 | "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part, | |
562 | addr->domain) >= 0 && | |
563 | smtp_read_response(&inblock, randombuffer, | |
564 | sizeof(randombuffer), '2', callout); | |
565 | ||
566 | /* Remember when we last did a random test */ | |
567 | ||
568 | new_domain_record.random_stamp = time(NULL); | |
569 | ||
570 | /* If accepted, we aren't going to do any further tests below. */ | |
571 | ||
572 | if (random_ok) | |
573 | { | |
574 | new_domain_record.random_result = ccache_accept; | |
575 | } | |
576 | ||
577 | /* Otherwise, cache a real negative response, and get back to the right | |
578 | state to send RCPT. Unless there's some problem such as a dropped | |
579 | connection, we expect to succeed, because the commands succeeded above. */ | |
580 | ||
581 | else if (errno == 0) | |
582 | { | |
583 | if (randombuffer[0] == '5') | |
584 | new_domain_record.random_result = ccache_reject; | |
585 | ||
586 | done = | |
587 | smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 && | |
588 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), | |
589 | '2', callout) && | |
590 | ||
90e9ce59 PH |
591 | smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n", |
592 | from_address) >= 0 && | |
059ec3d9 PH |
593 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), |
594 | '2', callout); | |
595 | } | |
596 | else done = FALSE; /* Some timeout/connection problem */ | |
597 | } /* Random check */ | |
598 | ||
599 | /* If the host is accepting all local parts, as determined by the "random" | |
600 | check, we don't need to waste time doing any further checking. */ | |
601 | ||
602 | if (new_domain_record.random_result != ccache_accept && done) | |
603 | { | |
5417f6d1 PH |
604 | /* Get the rcpt_include_affixes flag from the transport if there is one, |
605 | but assume FALSE if there is not. */ | |
606 | ||
059ec3d9 PH |
607 | done = |
608 | smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n", | |
c688b954 | 609 | transport_rcpt_address(addr, |
5417f6d1 PH |
610 | (addr->transport == NULL)? FALSE : |
611 | addr->transport->rcpt_include_affixes)) >= 0 && | |
059ec3d9 PH |
612 | smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), |
613 | '2', callout); | |
614 | ||
615 | if (done) | |
616 | new_address_record.result = ccache_accept; | |
617 | else if (errno == 0 && responsebuffer[0] == '5') | |
2c7db3f5 | 618 | { |
8e669ac1 | 619 | *failure_ptr = US"recipient"; |
059ec3d9 | 620 | new_address_record.result = ccache_reject; |
8e669ac1 | 621 | } |
059ec3d9 | 622 | |
2a4be8f9 PH |
623 | /* Do postmaster check if requested; if a full check is required, we |
624 | check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */ | |
059ec3d9 PH |
625 | |
626 | if (done && pm_mailfrom != NULL) | |
627 | { | |
628 | done = | |
629 | smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 && | |
630 | smtp_read_response(&inblock, responsebuffer, | |
631 | sizeof(responsebuffer), '2', callout) && | |
632 | ||
633 | smtp_write_command(&outblock, FALSE, | |
634 | "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 && | |
635 | smtp_read_response(&inblock, responsebuffer, | |
636 | sizeof(responsebuffer), '2', callout) && | |
637 | ||
2a4be8f9 PH |
638 | /* First try using the current domain */ |
639 | ||
640 | (( | |
059ec3d9 PH |
641 | smtp_write_command(&outblock, FALSE, |
642 | "RCPT TO:<postmaster@%.1000s>\r\n", addr->domain) >= 0 && | |
643 | smtp_read_response(&inblock, responsebuffer, | |
2a4be8f9 PH |
644 | sizeof(responsebuffer), '2', callout) |
645 | ) | |
646 | ||
647 | || | |
648 | ||
649 | /* If that doesn't work, and a full check is requested, | |
650 | try without the domain. */ | |
651 | ||
652 | ( | |
653 | (options & vopt_callout_fullpm) != 0 && | |
654 | smtp_write_command(&outblock, FALSE, | |
655 | "RCPT TO:<postmaster>\r\n") >= 0 && | |
656 | smtp_read_response(&inblock, responsebuffer, | |
657 | sizeof(responsebuffer), '2', callout) | |
658 | )); | |
659 | ||
660 | /* Sort out the cache record */ | |
059ec3d9 PH |
661 | |
662 | new_domain_record.postmaster_stamp = time(NULL); | |
663 | ||
664 | if (done) | |
665 | new_domain_record.postmaster_result = ccache_accept; | |
666 | else if (errno == 0 && responsebuffer[0] == '5') | |
667 | { | |
8e669ac1 | 668 | *failure_ptr = US"postmaster"; |
059ec3d9 PH |
669 | setflag(addr, af_verify_pmfail); |
670 | new_domain_record.postmaster_result = ccache_reject; | |
671 | } | |
672 | } | |
673 | } /* Random not accepted */ | |
90e9ce59 | 674 | } /* MAIL FROM: accepted */ |
059ec3d9 PH |
675 | |
676 | /* For any failure of the main check, other than a negative response, we just | |
677 | close the connection and carry on. We can identify a negative response by the | |
678 | fact that errno is zero. For I/O errors it will be non-zero | |
679 | ||
680 | Set up different error texts for logging and for sending back to the caller | |
681 | as an SMTP response. Log in all cases, using a one-line format. For sender | |
682 | callouts, give a full response to the caller, but for recipient callouts, | |
683 | don't give the IP address because this may be an internal host whose identity | |
684 | is not to be widely broadcast. */ | |
685 | ||
686 | if (!done) | |
687 | { | |
688 | if (errno == ETIMEDOUT) | |
689 | { | |
690 | HDEBUG(D_verify) debug_printf("SMTP timeout\n"); | |
8e669ac1 | 691 | send_quit = FALSE; |
059ec3d9 PH |
692 | } |
693 | else if (errno == 0) | |
694 | { | |
695 | if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped"); | |
696 | ||
697 | addr->message = | |
698 | string_sprintf("response to \"%s\" from %s [%s] was: %s", | |
699 | big_buffer, host->name, host->address, | |
700 | string_printing(responsebuffer)); | |
701 | ||
702 | addr->user_message = is_recipient? | |
703 | string_sprintf("Callout verification failed:\n%s", responsebuffer) | |
704 | : | |
705 | string_sprintf("Called: %s\nSent: %s\nResponse: %s", | |
706 | host->address, big_buffer, responsebuffer); | |
707 | ||
708 | /* Hard rejection ends the process */ | |
709 | ||
710 | if (responsebuffer[0] == '5') /* Address rejected */ | |
711 | { | |
712 | yield = FAIL; | |
713 | done = TRUE; | |
714 | } | |
715 | } | |
716 | } | |
717 | ||
718 | /* End the SMTP conversation and close the connection. */ | |
719 | ||
c9bdd01c | 720 | if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); |
f1e894f3 | 721 | (void)close(inblock.sock); |
059ec3d9 PH |
722 | } /* Loop through all hosts, while !done */ |
723 | ||
724 | /* If we get here with done == TRUE, a successful callout happened, and yield | |
725 | will be set OK or FAIL according to the response to the RCPT command. | |
726 | Otherwise, we looped through the hosts but couldn't complete the business. | |
727 | However, there may be domain-specific information to cache in both cases. | |
728 | ||
729 | The value of the result field in the new_domain record is ccache_unknown if | |
90e9ce59 | 730 | there was an error before or with MAIL FROM:, and errno was not zero, |
059ec3d9 | 731 | implying some kind of I/O error. We don't want to write the cache in that case. |
2b1c6e3a | 732 | Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */ |
059ec3d9 PH |
733 | |
734 | if (!callout_no_cache && new_domain_record.result != ccache_unknown) | |
735 | { | |
736 | if ((dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE)) | |
737 | == NULL) | |
738 | { | |
739 | HDEBUG(D_verify) debug_printf("callout cache: not available\n"); | |
740 | } | |
741 | else | |
742 | { | |
743 | (void)dbfn_write(dbm_file, addr->domain, &new_domain_record, | |
744 | (int)sizeof(dbdata_callout_cache)); | |
745 | HDEBUG(D_verify) debug_printf("wrote callout cache domain record:\n" | |
746 | " result=%d postmaster=%d random=%d\n", | |
747 | new_domain_record.result, | |
748 | new_domain_record.postmaster_result, | |
749 | new_domain_record.random_result); | |
750 | } | |
751 | } | |
752 | ||
753 | /* If a definite result was obtained for the callout, cache it unless caching | |
754 | is disabled. */ | |
755 | ||
756 | if (done) | |
757 | { | |
758 | if (!callout_no_cache && new_address_record.result != ccache_unknown) | |
759 | { | |
760 | if (dbm_file == NULL) | |
761 | dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE); | |
762 | if (dbm_file == NULL) | |
763 | { | |
764 | HDEBUG(D_verify) debug_printf("no callout cache available\n"); | |
765 | } | |
766 | else | |
767 | { | |
768 | (void)dbfn_write(dbm_file, address_key, &new_address_record, | |
769 | (int)sizeof(dbdata_callout_cache_address)); | |
770 | HDEBUG(D_verify) debug_printf("wrote %s callout cache address record\n", | |
771 | (new_address_record.result == ccache_accept)? "positive" : "negative"); | |
772 | } | |
773 | } | |
774 | } /* done */ | |
775 | ||
776 | /* Failure to connect to any host, or any response other than 2xx or 5xx is a | |
777 | temporary error. If there was only one host, and a response was received, leave | |
778 | it alone if supplying details. Otherwise, give a generic response. */ | |
779 | ||
780 | else /* !done */ | |
781 | { | |
782 | uschar *dullmsg = string_sprintf("Could not complete %s verify callout", | |
783 | is_recipient? "recipient" : "sender"); | |
784 | yield = DEFER; | |
785 | ||
786 | if (host_list->next != NULL || addr->message == NULL) addr->message = dullmsg; | |
787 | ||
788 | addr->user_message = (!smtp_return_error_details)? dullmsg : | |
789 | string_sprintf("%s for <%s>.\n" | |
790 | "The mail server(s) for the domain may be temporarily unreachable, or\n" | |
791 | "they may be permanently unreachable from this server. In the latter case,\n%s", | |
792 | dullmsg, addr->address, | |
793 | is_recipient? | |
794 | "the address will never be accepted." | |
795 | : | |
796 | "you need to change the address or create an MX record for its domain\n" | |
797 | "if it is supposed to be generally accessible from the Internet.\n" | |
798 | "Talk to your mail administrator for details."); | |
799 | ||
800 | /* Force a specific error code */ | |
801 | ||
802 | addr->basic_errno = ERRNO_CALLOUTDEFER; | |
803 | } | |
804 | ||
805 | /* Come here from within the cache-reading code on fast-track exit. */ | |
806 | ||
807 | END_CALLOUT: | |
808 | if (dbm_file != NULL) dbfn_close(dbm_file); | |
809 | return yield; | |
810 | } | |
811 | ||
812 | ||
813 | ||
814 | /************************************************* | |
815 | * Copy error to toplevel address * | |
816 | *************************************************/ | |
817 | ||
818 | /* This function is used when a verify fails or defers, to ensure that the | |
819 | failure or defer information is in the original toplevel address. This applies | |
820 | when an address is redirected to a single new address, and the failure or | |
821 | deferral happens to the child address. | |
822 | ||
823 | Arguments: | |
824 | vaddr the verify address item | |
825 | addr the final address item | |
826 | yield FAIL or DEFER | |
827 | ||
828 | Returns: the value of YIELD | |
829 | */ | |
830 | ||
831 | static int | |
832 | copy_error(address_item *vaddr, address_item *addr, int yield) | |
833 | { | |
834 | if (addr != vaddr) | |
835 | { | |
836 | vaddr->message = addr->message; | |
837 | vaddr->user_message = addr->user_message; | |
838 | vaddr->basic_errno = addr->basic_errno; | |
839 | vaddr->more_errno = addr->more_errno; | |
b37c4101 | 840 | vaddr->p.address_data = addr->p.address_data; |
059ec3d9 PH |
841 | } |
842 | return yield; | |
843 | } | |
844 | ||
845 | ||
846 | ||
847 | ||
848 | /************************************************* | |
849 | * Verify an email address * | |
850 | *************************************************/ | |
851 | ||
852 | /* This function is used both for verification (-bv and at other times) and | |
853 | address testing (-bt), which is indicated by address_test_mode being set. | |
854 | ||
855 | Arguments: | |
856 | vaddr contains the address to verify; the next field in this block | |
857 | must be NULL | |
858 | f if not NULL, write the result to this file | |
859 | options various option bits: | |
860 | vopt_fake_sender => this sender verify is not for the real | |
861 | sender (it was verify=sender=xxxx or an address from a | |
862 | header line) - rewriting must not change sender_address | |
863 | vopt_is_recipient => this is a recipient address, otherwise | |
864 | it's a sender address - this affects qualification and | |
865 | rewriting and messages from callouts | |
866 | vopt_qualify => qualify an unqualified address; else error | |
867 | vopt_expn => called from SMTP EXPN command | |
eafd343b TK |
868 | vopt_success_on_redirect => when a new address is generated |
869 | the verification instantly succeeds | |
059ec3d9 PH |
870 | |
871 | These ones are used by do_callout() -- the options variable | |
872 | is passed to it. | |
873 | ||
2a4be8f9 | 874 | vopt_callout_fullpm => if postmaster check, do full one |
059ec3d9 PH |
875 | vopt_callout_no_cache => don't use callout cache |
876 | vopt_callout_random => do the "random" thing | |
877 | vopt_callout_recipsender => use real sender for recipient | |
878 | vopt_callout_recippmaster => use postmaster for recipient | |
879 | ||
880 | callout if > 0, specifies that callout is required, and gives timeout | |
4deaf07d | 881 | for individual commands |
059ec3d9 PH |
882 | callout_overall if > 0, gives overall timeout for the callout function; |
883 | if < 0, a default is used (see do_callout()) | |
8e669ac1 | 884 | callout_connect the connection timeout for callouts |
059ec3d9 PH |
885 | se_mailfrom when callout is requested to verify a sender, use this |
886 | in MAIL FROM; NULL => "" | |
887 | pm_mailfrom when callout is requested, if non-NULL, do the postmaster | |
888 | thing and use this as the sender address (may be "") | |
889 | ||
890 | routed if not NULL, set TRUE if routing succeeded, so we can | |
891 | distinguish between routing failed and callout failed | |
892 | ||
893 | Returns: OK address verified | |
894 | FAIL address failed to verify | |
895 | DEFER can't tell at present | |
896 | */ | |
897 | ||
898 | int | |
899 | verify_address(address_item *vaddr, FILE *f, int options, int callout, | |
8e669ac1 | 900 | int callout_overall, int callout_connect, uschar *se_mailfrom, |
4deaf07d | 901 | uschar *pm_mailfrom, BOOL *routed) |
059ec3d9 PH |
902 | { |
903 | BOOL allok = TRUE; | |
904 | BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0); | |
905 | BOOL is_recipient = (options & vopt_is_recipient) != 0; | |
906 | BOOL expn = (options & vopt_expn) != 0; | |
eafd343b | 907 | BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0; |
059ec3d9 PH |
908 | int i; |
909 | int yield = OK; | |
910 | int verify_type = expn? v_expn : | |
911 | address_test_mode? v_none : | |
912 | is_recipient? v_recipient : v_sender; | |
913 | address_item *addr_list; | |
914 | address_item *addr_new = NULL; | |
915 | address_item *addr_remote = NULL; | |
916 | address_item *addr_local = NULL; | |
917 | address_item *addr_succeed = NULL; | |
8e669ac1 | 918 | uschar **failure_ptr = is_recipient? |
2c7db3f5 | 919 | &recipient_verify_failure : &sender_verify_failure; |
059ec3d9 PH |
920 | uschar *ko_prefix, *cr; |
921 | uschar *address = vaddr->address; | |
922 | uschar *save_sender; | |
923 | uschar null_sender[] = { 0 }; /* Ensure writeable memory */ | |
924 | ||
2c7db3f5 PH |
925 | /* Clear, just in case */ |
926 | ||
927 | *failure_ptr = NULL; | |
928 | ||
059ec3d9 PH |
929 | /* Set up a prefix and suffix for error message which allow us to use the same |
930 | output statements both in EXPN mode (where an SMTP response is needed) and when | |
931 | debugging with an output file. */ | |
932 | ||
933 | if (expn) | |
934 | { | |
935 | ko_prefix = US"553 "; | |
936 | cr = US"\r"; | |
937 | } | |
938 | else ko_prefix = cr = US""; | |
939 | ||
940 | /* Add qualify domain if permitted; otherwise an unqualified address fails. */ | |
941 | ||
942 | if (parse_find_at(address) == NULL) | |
943 | { | |
944 | if ((options & vopt_qualify) == 0) | |
945 | { | |
946 | if (f != NULL) | |
947 | fprintf(f, "%sA domain is required for \"%s\"%s\n", ko_prefix, address, | |
948 | cr); | |
8e669ac1 | 949 | *failure_ptr = US"qualify"; |
059ec3d9 PH |
950 | return FAIL; |
951 | } | |
952 | address = rewrite_address_qualify(address, is_recipient); | |
953 | } | |
954 | ||
955 | DEBUG(D_verify) | |
956 | { | |
957 | debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
958 | debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address); | |
959 | } | |
960 | ||
961 | /* Rewrite and report on it. Clear the domain and local part caches - these | |
962 | may have been set by domains and local part tests during an ACL. */ | |
963 | ||
964 | if (global_rewrite_rules != NULL) | |
965 | { | |
966 | uschar *old = address; | |
967 | address = rewrite_address(address, is_recipient, FALSE, | |
968 | global_rewrite_rules, rewrite_existflags); | |
969 | if (address != old) | |
970 | { | |
971 | for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0; | |
972 | for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0; | |
973 | if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address); | |
974 | } | |
975 | } | |
976 | ||
977 | /* If this is the real sender address, we must update sender_address at | |
978 | this point, because it may be referred to in the routers. */ | |
979 | ||
980 | if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0) | |
981 | sender_address = address; | |
982 | ||
983 | /* If the address was rewritten to <> no verification can be done, and we have | |
984 | to return OK. This rewriting is permitted only for sender addresses; for other | |
985 | addresses, such rewriting fails. */ | |
986 | ||
987 | if (address[0] == 0) return OK; | |
988 | ||
989 | /* Save a copy of the sender address for re-instating if we change it to <> | |
990 | while verifying a sender address (a nice bit of self-reference there). */ | |
991 | ||
992 | save_sender = sender_address; | |
993 | ||
994 | /* Update the address structure with the possibly qualified and rewritten | |
995 | address. Set it up as the starting address on the chain of new addresses. */ | |
996 | ||
997 | vaddr->address = address; | |
998 | addr_new = vaddr; | |
999 | ||
1000 | /* We need a loop, because an address can generate new addresses. We must also | |
1001 | cope with generated pipes and files at the top level. (See also the code and | |
1002 | comment in deliver.c.) However, it is usually the case that the router for | |
1003 | user's .forward files has its verify flag turned off. | |
1004 | ||
1005 | If an address generates more than one child, the loop is used only when | |
1006 | full_info is set, and this can only be set locally. Remote enquiries just get | |
1007 | information about the top level address, not anything that it generated. */ | |
1008 | ||
1009 | while (addr_new != NULL) | |
1010 | { | |
1011 | int rc; | |
1012 | address_item *addr = addr_new; | |
1013 | ||
1014 | addr_new = addr->next; | |
1015 | addr->next = NULL; | |
1016 | ||
1017 | DEBUG(D_verify) | |
1018 | { | |
1019 | debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1020 | debug_printf("Considering %s\n", addr->address); | |
1021 | } | |
1022 | ||
1023 | /* Handle generated pipe, file or reply addresses. We don't get these | |
1024 | when handling EXPN, as it does only one level of expansion. */ | |
1025 | ||
1026 | if (testflag(addr, af_pfr)) | |
1027 | { | |
1028 | allok = FALSE; | |
1029 | if (f != NULL) | |
1030 | { | |
1031 | BOOL allow; | |
1032 | ||
1033 | if (addr->address[0] == '>') | |
1034 | { | |
1035 | allow = testflag(addr, af_allow_reply); | |
1036 | fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1); | |
1037 | } | |
1038 | else | |
1039 | { | |
1040 | allow = (addr->address[0] == '|')? | |
1041 | testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file); | |
1042 | fprintf(f, "%s -> %s", addr->parent->address, addr->address); | |
1043 | } | |
1044 | ||
1045 | if (addr->basic_errno == ERRNO_BADTRANSPORT) | |
1046 | fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n" | |
1047 | "%s\n", addr->message); | |
1048 | else if (allow) | |
1049 | fprintf(f, "\n transport = %s\n", addr->transport->name); | |
1050 | else | |
1051 | fprintf(f, " *** forbidden ***\n"); | |
1052 | } | |
1053 | continue; | |
1054 | } | |
1055 | ||
1056 | /* Just in case some router parameter refers to it. */ | |
1057 | ||
1058 | return_path = (addr->p.errors_address != NULL)? | |
1059 | addr->p.errors_address : sender_address; | |
1060 | ||
1061 | /* Split the address into domain and local part, handling the %-hack if | |
1062 | necessary, and then route it. While routing a sender address, set | |
1063 | $sender_address to <> because that is what it will be if we were trying to | |
1064 | send a bounce to the sender. */ | |
1065 | ||
1066 | if (routed != NULL) *routed = FALSE; | |
1067 | if ((rc = deliver_split_address(addr)) == OK) | |
1068 | { | |
1069 | if (!is_recipient) sender_address = null_sender; | |
1070 | rc = route_address(addr, &addr_local, &addr_remote, &addr_new, | |
1071 | &addr_succeed, verify_type); | |
1072 | sender_address = save_sender; /* Put back the real sender */ | |
1073 | } | |
1074 | ||
1075 | /* If routing an address succeeded, set the flag that remembers, for use when | |
1076 | an ACL cached a sender verify (in case a callout fails). Then if routing set | |
1077 | up a list of hosts or the transport has a host list, and the callout option | |
1078 | is set, and we aren't in a host checking run, do the callout verification, | |
1079 | and set another flag that notes that a callout happened. */ | |
1080 | ||
1081 | if (rc == OK) | |
1082 | { | |
1083 | if (routed != NULL) *routed = TRUE; | |
1084 | if (callout > 0) | |
1085 | { | |
1086 | host_item *host_list = addr->host_list; | |
1087 | ||
26da7e20 PH |
1088 | /* Make up some data for use in the case where there is no remote |
1089 | transport. */ | |
1090 | ||
1091 | transport_feedback tf = { | |
1092 | NULL, /* interface (=> any) */ | |
1093 | US"smtp", /* port */ | |
1094 | US"smtp", /* protocol */ | |
1095 | NULL, /* hosts */ | |
1096 | US"$smtp_active_hostname", /* helo_data */ | |
1097 | FALSE, /* hosts_override */ | |
1098 | FALSE, /* hosts_randomize */ | |
1099 | FALSE, /* gethostbyname */ | |
1100 | TRUE, /* qualify_single */ | |
1101 | FALSE /* search_parents */ | |
1102 | }; | |
059ec3d9 PH |
1103 | |
1104 | /* If verification yielded a remote transport, we want to use that | |
1105 | transport's options, so as to mimic what would happen if we were really | |
1106 | sending a message to this address. */ | |
1107 | ||
1108 | if (addr->transport != NULL && !addr->transport->info->local) | |
1109 | { | |
929ba01c | 1110 | (void)(addr->transport->setup)(addr->transport, addr, &tf, 0, 0, NULL); |
059ec3d9 PH |
1111 | |
1112 | /* If the transport has hosts and the router does not, or if the | |
1113 | transport is configured to override the router's hosts, we must build a | |
1114 | host list of the transport's hosts, and find the IP addresses */ | |
1115 | ||
1116 | if (tf.hosts != NULL && (host_list == NULL || tf.hosts_override)) | |
1117 | { | |
1118 | uschar *s; | |
750af86e PH |
1119 | uschar *save_deliver_domain = deliver_domain; |
1120 | uschar *save_deliver_localpart = deliver_localpart; | |
059ec3d9 PH |
1121 | |
1122 | host_list = NULL; /* Ignore the router's hosts */ | |
1123 | ||
1124 | deliver_domain = addr->domain; | |
1125 | deliver_localpart = addr->local_part; | |
1126 | s = expand_string(tf.hosts); | |
750af86e PH |
1127 | deliver_domain = save_deliver_domain; |
1128 | deliver_localpart = save_deliver_localpart; | |
059ec3d9 PH |
1129 | |
1130 | if (s == NULL) | |
1131 | { | |
1132 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts " | |
1133 | "\"%s\" in %s transport for callout: %s", tf.hosts, | |
1134 | addr->transport->name, expand_string_message); | |
1135 | } | |
1136 | else | |
1137 | { | |
322050c2 | 1138 | int flags; |
059ec3d9 | 1139 | uschar *canonical_name; |
d8ef3577 | 1140 | host_item *host, *nexthost; |
059ec3d9 PH |
1141 | host_build_hostlist(&host_list, s, tf.hosts_randomize); |
1142 | ||
1143 | /* Just ignore failures to find a host address. If we don't manage | |
8e669ac1 PH |
1144 | to find any addresses, the callout will defer. Note that more than |
1145 | one address may be found for a single host, which will result in | |
1146 | additional host items being inserted into the chain. Hence we must | |
d8ef3577 | 1147 | save the next host first. */ |
059ec3d9 | 1148 | |
322050c2 PH |
1149 | flags = HOST_FIND_BY_A; |
1150 | if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; | |
1151 | if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS; | |
1152 | ||
d8ef3577 | 1153 | for (host = host_list; host != NULL; host = nexthost) |
059ec3d9 | 1154 | { |
d8ef3577 | 1155 | nexthost = host->next; |
8e669ac1 | 1156 | if (tf.gethostbyname || |
7e66e54d | 1157 | string_is_ip_address(host->name, NULL) != 0) |
322050c2 | 1158 | (void)host_find_byname(host, NULL, flags, &canonical_name, TRUE); |
059ec3d9 | 1159 | else |
059ec3d9 PH |
1160 | (void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
1161 | &canonical_name, NULL); | |
059ec3d9 PH |
1162 | } |
1163 | } | |
1164 | } | |
1165 | } | |
1166 | ||
8e669ac1 | 1167 | /* Can only do a callout if we have at least one host! If the callout |
2c7db3f5 | 1168 | fails, it will have set ${sender,recipient}_verify_failure. */ |
059ec3d9 PH |
1169 | |
1170 | if (host_list != NULL) | |
1171 | { | |
1172 | HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n"); | |
1173 | if (host_checking && !host_checking_callout) | |
1174 | { | |
1175 | HDEBUG(D_verify) | |
1176 | debug_printf("... callout omitted by default when host testing\n" | |
1177 | "(Use -bhc if you want the callouts to happen.)\n"); | |
1178 | } | |
1179 | else | |
1180 | { | |
1181 | rc = do_callout(addr, host_list, &tf, callout, callout_overall, | |
4deaf07d | 1182 | callout_connect, options, se_mailfrom, pm_mailfrom); |
059ec3d9 PH |
1183 | } |
1184 | } | |
1185 | else | |
1186 | { | |
1187 | HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor " | |
1188 | "transport provided a host list\n"); | |
1189 | } | |
1190 | } | |
1191 | } | |
8e669ac1 | 1192 | |
2c7db3f5 | 1193 | /* Otherwise, any failure is a routing failure */ |
8e669ac1 PH |
1194 | |
1195 | else *failure_ptr = US"route"; | |
059ec3d9 PH |
1196 | |
1197 | /* A router may return REROUTED if it has set up a child address as a result | |
1198 | of a change of domain name (typically from widening). In this case we always | |
1199 | want to continue to verify the new child. */ | |
1200 | ||
1201 | if (rc == REROUTED) continue; | |
8e669ac1 | 1202 | |
059ec3d9 PH |
1203 | /* Handle hard failures */ |
1204 | ||
1205 | if (rc == FAIL) | |
1206 | { | |
1207 | allok = FALSE; | |
1208 | if (f != NULL) | |
1209 | { | |
e6f6568e PH |
1210 | address_item *p = addr->parent; |
1211 | ||
322050c2 | 1212 | fprintf(f, "%s%s %s", ko_prefix, full_info? addr->address : address, |
059ec3d9 PH |
1213 | address_test_mode? "is undeliverable" : "failed to verify"); |
1214 | if (!expn && admin_user) | |
1215 | { | |
1216 | if (addr->basic_errno > 0) | |
1217 | fprintf(f, ": %s", strerror(addr->basic_errno)); | |
1218 | if (addr->message != NULL) | |
e6f6568e PH |
1219 | fprintf(f, ": %s", addr->message); |
1220 | } | |
1221 | ||
1222 | /* Show parents iff doing full info */ | |
1223 | ||
1224 | if (full_info) while (p != NULL) | |
1225 | { | |
1226 | fprintf(f, "%s\n <-- %s", cr, p->address); | |
1227 | p = p->parent; | |
059ec3d9 PH |
1228 | } |
1229 | fprintf(f, "%s\n", cr); | |
1230 | } | |
1231 | ||
1232 | if (!full_info) return copy_error(vaddr, addr, FAIL); | |
1233 | else yield = FAIL; | |
1234 | } | |
1235 | ||
1236 | /* Soft failure */ | |
1237 | ||
1238 | else if (rc == DEFER) | |
1239 | { | |
1240 | allok = FALSE; | |
1241 | if (f != NULL) | |
1242 | { | |
e6f6568e PH |
1243 | address_item *p = addr->parent; |
1244 | fprintf(f, "%s%s cannot be resolved at this time", ko_prefix, | |
322050c2 | 1245 | full_info? addr->address : address); |
059ec3d9 PH |
1246 | if (!expn && admin_user) |
1247 | { | |
1248 | if (addr->basic_errno > 0) | |
e6f6568e | 1249 | fprintf(f, ": %s", strerror(addr->basic_errno)); |
059ec3d9 | 1250 | if (addr->message != NULL) |
e6f6568e | 1251 | fprintf(f, ": %s", addr->message); |
059ec3d9 | 1252 | else if (addr->basic_errno <= 0) |
e6f6568e | 1253 | fprintf(f, ": unknown error"); |
059ec3d9 PH |
1254 | } |
1255 | ||
e6f6568e PH |
1256 | /* Show parents iff doing full info */ |
1257 | ||
1258 | if (full_info) while (p != NULL) | |
1259 | { | |
1260 | fprintf(f, "%s\n <-- %s", cr, p->address); | |
1261 | p = p->parent; | |
1262 | } | |
059ec3d9 PH |
1263 | fprintf(f, "%s\n", cr); |
1264 | } | |
e6f6568e | 1265 | |
059ec3d9 PH |
1266 | if (!full_info) return copy_error(vaddr, addr, DEFER); |
1267 | else if (yield == OK) yield = DEFER; | |
1268 | } | |
1269 | ||
1270 | /* If we are handling EXPN, we do not want to continue to route beyond | |
e6f6568e | 1271 | the top level (whose address is in "address"). */ |
059ec3d9 PH |
1272 | |
1273 | else if (expn) | |
1274 | { | |
1275 | uschar *ok_prefix = US"250-"; | |
1276 | if (addr_new == NULL) | |
1277 | { | |
1278 | if (addr_local == NULL && addr_remote == NULL) | |
1279 | fprintf(f, "250 mail to <%s> is discarded\r\n", address); | |
1280 | else | |
1281 | fprintf(f, "250 <%s>\r\n", address); | |
1282 | } | |
1283 | else while (addr_new != NULL) | |
1284 | { | |
1285 | address_item *addr2 = addr_new; | |
1286 | addr_new = addr2->next; | |
1287 | if (addr_new == NULL) ok_prefix = US"250 "; | |
1288 | fprintf(f, "%s<%s>\r\n", ok_prefix, addr2->address); | |
1289 | } | |
1290 | return OK; | |
1291 | } | |
1292 | ||
1293 | /* Successful routing other than EXPN. */ | |
1294 | ||
1295 | else | |
1296 | { | |
1297 | /* Handle successful routing when short info wanted. Otherwise continue for | |
1298 | other (generated) addresses. Short info is the operational case. Full info | |
1299 | can be requested only when debug_selector != 0 and a file is supplied. | |
1300 | ||
1301 | There is a conflict between the use of aliasing as an alternate email | |
1302 | address, and as a sort of mailing list. If an alias turns the incoming | |
1303 | address into just one address (e.g. J.Caesar->jc44) you may well want to | |
1304 | carry on verifying the generated address to ensure it is valid when | |
1305 | checking incoming mail. If aliasing generates multiple addresses, you | |
1306 | probably don't want to do this. Exim therefore treats the generation of | |
1307 | just a single new address as a special case, and continues on to verify the | |
1308 | generated address. */ | |
1309 | ||
1310 | if (!full_info && /* Stop if short info wanted AND */ | |
eafd343b TK |
1311 | (((addr_new == NULL || /* No new address OR */ |
1312 | addr_new->next != NULL || /* More than one new address OR */ | |
1313 | testflag(addr_new, af_pfr))) /* New address is pfr */ | |
1314 | || /* OR */ | |
1315 | (addr_new != NULL && /* At least one new address AND */ | |
1316 | success_on_redirect))) /* success_on_redirect is set */ | |
059ec3d9 | 1317 | { |
322050c2 | 1318 | if (f != NULL) fprintf(f, "%s %s\n", address, |
059ec3d9 PH |
1319 | address_test_mode? "is deliverable" : "verified"); |
1320 | ||
1321 | /* If we have carried on to verify a child address, we want the value | |
1322 | of $address_data to be that of the child */ | |
1323 | ||
1324 | vaddr->p.address_data = addr->p.address_data; | |
1325 | return OK; | |
1326 | } | |
1327 | } | |
1328 | } /* Loop for generated addresses */ | |
1329 | ||
1330 | /* Display the full results of the successful routing, including any generated | |
1331 | addresses. Control gets here only when full_info is set, which requires f not | |
1332 | to be NULL, and this occurs only when a top-level verify is called with the | |
1333 | debugging switch on. | |
1334 | ||
1335 | If there are no local and no remote addresses, and there were no pipes, files, | |
1336 | or autoreplies, and there were no errors or deferments, the message is to be | |
1337 | discarded, usually because of the use of :blackhole: in an alias file. */ | |
1338 | ||
1339 | if (allok && addr_local == NULL && addr_remote == NULL) | |
dbcef0ea | 1340 | { |
059ec3d9 | 1341 | fprintf(f, "mail to %s is discarded\n", address); |
dbcef0ea PH |
1342 | return yield; |
1343 | } | |
059ec3d9 | 1344 | |
dbcef0ea | 1345 | for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++) |
059ec3d9 PH |
1346 | { |
1347 | while (addr_list != NULL) | |
1348 | { | |
1349 | address_item *addr = addr_list; | |
1350 | address_item *p = addr->parent; | |
1351 | addr_list = addr->next; | |
1352 | ||
1353 | fprintf(f, "%s", CS addr->address); | |
384152a6 TK |
1354 | #ifdef EXPERIMENTAL_SRS |
1355 | if(addr->p.srs_sender) | |
1356 | fprintf(f, " [srs = %s]", addr->p.srs_sender); | |
1357 | #endif | |
dbcef0ea PH |
1358 | |
1359 | /* If the address is a duplicate, show something about it. */ | |
1360 | ||
1361 | if (!testflag(addr, af_pfr)) | |
1362 | { | |
1363 | tree_node *tnode; | |
1364 | if ((tnode = tree_search(tree_duplicates, addr->unique)) != NULL) | |
1365 | fprintf(f, " [duplicate, would not be delivered]"); | |
1366 | else tree_add_duplicate(addr->unique, addr); | |
1367 | } | |
1368 | ||
1369 | /* Now show its parents */ | |
1370 | ||
059ec3d9 PH |
1371 | while (p != NULL) |
1372 | { | |
1373 | fprintf(f, "\n <-- %s", p->address); | |
1374 | p = p->parent; | |
1375 | } | |
1376 | fprintf(f, "\n "); | |
1377 | ||
1378 | /* Show router, and transport */ | |
1379 | ||
1380 | fprintf(f, "router = %s, ", addr->router->name); | |
1381 | fprintf(f, "transport = %s\n", (addr->transport == NULL)? US"unset" : | |
1382 | addr->transport->name); | |
1383 | ||
1384 | /* Show any hosts that are set up by a router unless the transport | |
1385 | is going to override them; fiddle a bit to get a nice format. */ | |
1386 | ||
1387 | if (addr->host_list != NULL && addr->transport != NULL && | |
1388 | !addr->transport->overrides_hosts) | |
1389 | { | |
1390 | host_item *h; | |
1391 | int maxlen = 0; | |
1392 | int maxaddlen = 0; | |
1393 | for (h = addr->host_list; h != NULL; h = h->next) | |
1394 | { | |
1395 | int len = Ustrlen(h->name); | |
1396 | if (len > maxlen) maxlen = len; | |
1397 | len = (h->address != NULL)? Ustrlen(h->address) : 7; | |
1398 | if (len > maxaddlen) maxaddlen = len; | |
1399 | } | |
1400 | for (h = addr->host_list; h != NULL; h = h->next) | |
1401 | { | |
1402 | int len = Ustrlen(h->name); | |
1403 | fprintf(f, " host %s ", h->name); | |
1404 | while (len++ < maxlen) fprintf(f, " "); | |
1405 | if (h->address != NULL) | |
1406 | { | |
1407 | fprintf(f, "[%s] ", h->address); | |
1408 | len = Ustrlen(h->address); | |
1409 | } | |
1410 | else if (!addr->transport->info->local) /* Omit [unknown] for local */ | |
1411 | { | |
1412 | fprintf(f, "[unknown] "); | |
1413 | len = 7; | |
1414 | } | |
1415 | else len = -3; | |
1416 | while (len++ < maxaddlen) fprintf(f," "); | |
1417 | if (h->mx >= 0) fprintf(f, "MX=%d", h->mx); | |
1418 | if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port); | |
1419 | if (h->status == hstatus_unusable) fprintf(f, " ** unusable **"); | |
1420 | fprintf(f, "\n"); | |
1421 | } | |
1422 | } | |
1423 | } | |
1424 | } | |
1425 | ||
8e669ac1 | 1426 | /* Will be DEFER or FAIL if any one address has, only for full_info (which is |
2c7db3f5 PH |
1427 | the -bv or -bt case). */ |
1428 | ||
8e669ac1 | 1429 | return yield; |
059ec3d9 PH |
1430 | } |
1431 | ||
1432 | ||
1433 | ||
1434 | ||
1435 | /************************************************* | |
1436 | * Check headers for syntax errors * | |
1437 | *************************************************/ | |
1438 | ||
1439 | /* This function checks those header lines that contain addresses, and verifies | |
1440 | that all the addresses therein are syntactially correct. | |
1441 | ||
1442 | Arguments: | |
1443 | msgptr where to put an error message | |
1444 | ||
1445 | Returns: OK | |
1446 | FAIL | |
1447 | */ | |
1448 | ||
1449 | int | |
1450 | verify_check_headers(uschar **msgptr) | |
1451 | { | |
1452 | header_line *h; | |
1453 | uschar *colon, *s; | |
1454 | ||
1455 | for (h = header_list; h != NULL; h = h->next) | |
1456 | { | |
1457 | if (h->type != htype_from && | |
1458 | h->type != htype_reply_to && | |
1459 | h->type != htype_sender && | |
1460 | h->type != htype_to && | |
1461 | h->type != htype_cc && | |
1462 | h->type != htype_bcc) | |
1463 | continue; | |
1464 | ||
1465 | colon = Ustrchr(h->text, ':'); | |
1466 | s = colon + 1; | |
1467 | while (isspace(*s)) s++; | |
1468 | ||
1469 | parse_allow_group = TRUE; /* Allow group syntax */ | |
1470 | ||
1471 | /* Loop for multiple addresses in the header */ | |
1472 | ||
1473 | while (*s != 0) | |
1474 | { | |
1475 | uschar *ss = parse_find_address_end(s, FALSE); | |
1476 | uschar *recipient, *errmess; | |
1477 | int terminator = *ss; | |
1478 | int start, end, domain; | |
1479 | ||
1480 | /* Temporarily terminate the string at this point, and extract the | |
1481 | operative address within. */ | |
1482 | ||
1483 | *ss = 0; | |
1484 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
1485 | *ss = terminator; | |
1486 | ||
1487 | /* Permit an unqualified address only if the message is local, or if the | |
1488 | sending host is configured to be permitted to send them. */ | |
1489 | ||
1490 | if (recipient != NULL && domain == 0) | |
1491 | { | |
1492 | if (h->type == htype_from || h->type == htype_sender) | |
1493 | { | |
1494 | if (!allow_unqualified_sender) recipient = NULL; | |
1495 | } | |
1496 | else | |
1497 | { | |
1498 | if (!allow_unqualified_recipient) recipient = NULL; | |
1499 | } | |
1500 | if (recipient == NULL) errmess = US"unqualified address not permitted"; | |
1501 | } | |
1502 | ||
1503 | /* It's an error if no address could be extracted, except for the special | |
1504 | case of an empty address. */ | |
1505 | ||
1506 | if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0) | |
1507 | { | |
1508 | uschar *verb = US"is"; | |
1509 | uschar *t = ss; | |
1ab95fa6 | 1510 | uschar *tt = colon; |
059ec3d9 PH |
1511 | int len; |
1512 | ||
1513 | /* Arrange not to include any white space at the end in the | |
1ab95fa6 | 1514 | error message or the header name. */ |
059ec3d9 PH |
1515 | |
1516 | while (t > s && isspace(t[-1])) t--; | |
1ab95fa6 | 1517 | while (tt > h->text && isspace(tt[-1])) tt--; |
059ec3d9 | 1518 | |
1ab95fa6 | 1519 | /* Add the address that failed to the error message, since in a |
059ec3d9 PH |
1520 | header with very many addresses it is sometimes hard to spot |
1521 | which one is at fault. However, limit the amount of address to | |
1522 | quote - cases have been seen where, for example, a missing double | |
1523 | quote in a humungous To: header creates an "address" that is longer | |
1524 | than string_sprintf can handle. */ | |
1525 | ||
1526 | len = t - s; | |
1527 | if (len > 1024) | |
1528 | { | |
1529 | len = 1024; | |
1530 | verb = US"begins"; | |
1531 | } | |
1532 | ||
1533 | *msgptr = string_printing( | |
1ab95fa6 PH |
1534 | string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s", |
1535 | errmess, tt - h->text, h->text, verb, len, s)); | |
059ec3d9 PH |
1536 | |
1537 | return FAIL; | |
1538 | } | |
1539 | ||
1540 | /* Advance to the next address */ | |
1541 | ||
1542 | s = ss + (terminator? 1:0); | |
1543 | while (isspace(*s)) s++; | |
1544 | } /* Next address */ | |
1545 | } /* Next header */ | |
1546 | ||
1547 | return OK; | |
1548 | } | |
1549 | ||
1550 | ||
1551 | ||
1c41c9cc PH |
1552 | /************************************************* |
1553 | * Check for blind recipients * | |
1554 | *************************************************/ | |
1555 | ||
1556 | /* This function checks that every (envelope) recipient is mentioned in either | |
1557 | the To: or Cc: header lines, thus detecting blind carbon copies. | |
1558 | ||
1559 | There are two ways of scanning that could be used: either scan the header lines | |
1560 | and tick off the recipients, or scan the recipients and check the header lines. | |
1561 | The original proposed patch did the former, but I have chosen to do the latter, | |
1562 | because (a) it requires no memory and (b) will use fewer resources when there | |
1563 | are many addresses in To: and/or Cc: and only one or two envelope recipients. | |
1564 | ||
1565 | Arguments: none | |
1566 | Returns: OK if there are no blind recipients | |
1567 | FAIL if there is at least one blind recipient | |
1568 | */ | |
1569 | ||
1570 | int | |
1571 | verify_check_notblind(void) | |
1572 | { | |
1573 | int i; | |
1574 | for (i = 0; i < recipients_count; i++) | |
1575 | { | |
1576 | header_line *h; | |
1577 | BOOL found = FALSE; | |
1578 | uschar *address = recipients_list[i].address; | |
1579 | ||
1580 | for (h = header_list; !found && h != NULL; h = h->next) | |
1581 | { | |
1582 | uschar *colon, *s; | |
1583 | ||
1584 | if (h->type != htype_to && h->type != htype_cc) continue; | |
1585 | ||
1586 | colon = Ustrchr(h->text, ':'); | |
1587 | s = colon + 1; | |
1588 | while (isspace(*s)) s++; | |
1589 | ||
1590 | parse_allow_group = TRUE; /* Allow group syntax */ | |
1591 | ||
1592 | /* Loop for multiple addresses in the header */ | |
1593 | ||
1594 | while (*s != 0) | |
1595 | { | |
1596 | uschar *ss = parse_find_address_end(s, FALSE); | |
1597 | uschar *recipient,*errmess; | |
1598 | int terminator = *ss; | |
1599 | int start, end, domain; | |
1600 | ||
1601 | /* Temporarily terminate the string at this point, and extract the | |
1602 | operative address within. */ | |
1603 | ||
1604 | *ss = 0; | |
1605 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
1606 | *ss = terminator; | |
1607 | ||
1608 | /* If we found a valid recipient that has a domain, compare it with the | |
1609 | envelope recipient. Local parts are compared case-sensitively, domains | |
1610 | case-insensitively. By comparing from the start with length "domain", we | |
1611 | include the "@" at the end, which ensures that we are comparing the whole | |
1612 | local part of each address. */ | |
1613 | ||
1614 | if (recipient != NULL && domain != 0) | |
1615 | { | |
1616 | found = Ustrncmp(recipient, address, domain) == 0 && | |
1617 | strcmpic(recipient + domain, address + domain) == 0; | |
1618 | if (found) break; | |
1619 | } | |
1620 | ||
1621 | /* Advance to the next address */ | |
1622 | ||
1623 | s = ss + (terminator? 1:0); | |
1624 | while (isspace(*s)) s++; | |
1625 | } /* Next address */ | |
1626 | } /* Next header (if found is false) */ | |
1627 | ||
1628 | if (!found) return FAIL; | |
1629 | } /* Next recipient */ | |
1630 | ||
1631 | return OK; | |
1632 | } | |
1633 | ||
1634 | ||
059ec3d9 PH |
1635 | |
1636 | /************************************************* | |
1637 | * Find if verified sender * | |
1638 | *************************************************/ | |
1639 | ||
1640 | /* Usually, just a single address is verified as the sender of the message. | |
1641 | However, Exim can be made to verify other addresses as well (often related in | |
1642 | some way), and this is useful in some environments. There may therefore be a | |
1643 | chain of such addresses that have previously been tested. This function finds | |
1644 | whether a given address is on the chain. | |
1645 | ||
1646 | Arguments: the address to be verified | |
1647 | Returns: pointer to an address item, or NULL | |
1648 | */ | |
1649 | ||
1650 | address_item * | |
1651 | verify_checked_sender(uschar *sender) | |
1652 | { | |
1653 | address_item *addr; | |
1654 | for (addr = sender_verified_list; addr != NULL; addr = addr->next) | |
1655 | if (Ustrcmp(sender, addr->address) == 0) break; | |
1656 | return addr; | |
1657 | } | |
1658 | ||
1659 | ||
1660 | ||
1661 | ||
1662 | ||
1663 | /************************************************* | |
1664 | * Get valid header address * | |
1665 | *************************************************/ | |
1666 | ||
1667 | /* Scan the originator headers of the message, looking for an address that | |
1668 | verifies successfully. RFC 822 says: | |
1669 | ||
1670 | o The "Sender" field mailbox should be sent notices of | |
1671 | any problems in transport or delivery of the original | |
1672 | messages. If there is no "Sender" field, then the | |
1673 | "From" field mailbox should be used. | |
1674 | ||
1675 | o If the "Reply-To" field exists, then the reply should | |
1676 | go to the addresses indicated in that field and not to | |
1677 | the address(es) indicated in the "From" field. | |
1678 | ||
1679 | So we check a Sender field if there is one, else a Reply_to field, else a From | |
1680 | field. As some strange messages may have more than one of these fields, | |
1681 | especially if they are resent- fields, check all of them if there is more than | |
1682 | one. | |
1683 | ||
1684 | Arguments: | |
1685 | user_msgptr points to where to put a user error message | |
1686 | log_msgptr points to where to put a log error message | |
1687 | callout timeout for callout check (passed to verify_address()) | |
1688 | callout_overall overall callout timeout (ditto) | |
8e669ac1 | 1689 | callout_connect connect callout timeout (ditto) |
059ec3d9 PH |
1690 | se_mailfrom mailfrom for verify; NULL => "" |
1691 | pm_mailfrom sender for pm callout check (passed to verify_address()) | |
1692 | options callout options (passed to verify_address()) | |
8e669ac1 | 1693 | verrno where to put the address basic_errno |
059ec3d9 PH |
1694 | |
1695 | If log_msgptr is set to something without setting user_msgptr, the caller | |
1696 | normally uses log_msgptr for both things. | |
1697 | ||
1698 | Returns: result of the verification attempt: OK, FAIL, or DEFER; | |
1699 | FAIL is given if no appropriate headers are found | |
1700 | */ | |
1701 | ||
1702 | int | |
1703 | verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr, | |
8e669ac1 | 1704 | int callout, int callout_overall, int callout_connect, uschar *se_mailfrom, |
fe5b5d0b | 1705 | uschar *pm_mailfrom, int options, int *verrno) |
059ec3d9 PH |
1706 | { |
1707 | static int header_types[] = { htype_sender, htype_reply_to, htype_from }; | |
1708 | int yield = FAIL; | |
1709 | int i; | |
1710 | ||
1711 | for (i = 0; i < 3; i++) | |
1712 | { | |
1713 | header_line *h; | |
1714 | for (h = header_list; h != NULL; h = h->next) | |
1715 | { | |
1716 | int terminator, new_ok; | |
1717 | uschar *s, *ss, *endname; | |
1718 | ||
1719 | if (h->type != header_types[i]) continue; | |
1720 | s = endname = Ustrchr(h->text, ':') + 1; | |
1721 | ||
1722 | while (*s != 0) | |
1723 | { | |
1724 | address_item *vaddr; | |
1725 | ||
1726 | while (isspace(*s) || *s == ',') s++; | |
1727 | if (*s == 0) break; /* End of header */ | |
1728 | ||
1729 | ss = parse_find_address_end(s, FALSE); | |
1730 | ||
1731 | /* The terminator is a comma or end of header, but there may be white | |
1732 | space preceding it (including newline for the last address). Move back | |
1733 | past any white space so we can check against any cached envelope sender | |
1734 | address verifications. */ | |
1735 | ||
1736 | while (isspace(ss[-1])) ss--; | |
1737 | terminator = *ss; | |
1738 | *ss = 0; | |
1739 | ||
1740 | HDEBUG(D_verify) debug_printf("verifying %.*s header address %s\n", | |
1741 | (int)(endname - h->text), h->text, s); | |
1742 | ||
1743 | /* See if we have already verified this address as an envelope sender, | |
1744 | and if so, use the previous answer. */ | |
1745 | ||
1746 | vaddr = verify_checked_sender(s); | |
1747 | ||
1748 | if (vaddr != NULL && /* Previously checked */ | |
1749 | (callout <= 0 || /* No callout needed; OR */ | |
1750 | vaddr->special_action > 256)) /* Callout was done */ | |
1751 | { | |
1752 | new_ok = vaddr->special_action & 255; | |
1753 | HDEBUG(D_verify) debug_printf("previously checked as envelope sender\n"); | |
1754 | *ss = terminator; /* Restore shortened string */ | |
1755 | } | |
1756 | ||
1757 | /* Otherwise we run the verification now. We must restore the shortened | |
1758 | string before running the verification, so the headers are correct, in | |
1759 | case there is any rewriting. */ | |
1760 | ||
1761 | else | |
1762 | { | |
1763 | int start, end, domain; | |
1764 | uschar *address = parse_extract_address(s, log_msgptr, &start, | |
1765 | &end, &domain, FALSE); | |
1766 | ||
1767 | *ss = terminator; | |
1768 | ||
1769 | /* If verification failed because of a syntax error, fail this | |
1770 | function, and ensure that the failing address gets added to the error | |
1771 | message. */ | |
1772 | ||
1773 | if (address == NULL) | |
1774 | { | |
1775 | new_ok = FAIL; | |
1776 | if (*log_msgptr != NULL) | |
1777 | { | |
1778 | while (ss > s && isspace(ss[-1])) ss--; | |
1779 | *log_msgptr = string_sprintf("syntax error in '%.*s' header when " | |
1780 | "scanning for sender: %s in \"%.*s\"", | |
1781 | endname - h->text, h->text, *log_msgptr, ss - s, s); | |
1782 | return FAIL; | |
1783 | } | |
1784 | } | |
1785 | ||
2f6603e1 | 1786 | /* Else go ahead with the sender verification. But it isn't *the* |
059ec3d9 PH |
1787 | sender of the message, so set vopt_fake_sender to stop sender_address |
1788 | being replaced after rewriting or qualification. */ | |
1789 | ||
1790 | else | |
1791 | { | |
1792 | vaddr = deliver_make_addr(address, FALSE); | |
1793 | new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender, | |
8e669ac1 | 1794 | callout, callout_overall, callout_connect, se_mailfrom, |
4deaf07d | 1795 | pm_mailfrom, NULL); |
059ec3d9 PH |
1796 | } |
1797 | } | |
1798 | ||
1799 | /* We now have the result, either newly found, or cached. If we are | |
1800 | giving out error details, set a specific user error. This means that the | |
1801 | last of these will be returned to the user if all three fail. We do not | |
1802 | set a log message - the generic one below will be used. */ | |
1803 | ||
fe5b5d0b | 1804 | if (new_ok != OK) |
059ec3d9 | 1805 | { |
8e669ac1 | 1806 | *verrno = vaddr->basic_errno; |
fe5b5d0b PH |
1807 | if (smtp_return_error_details) |
1808 | { | |
1809 | *user_msgptr = string_sprintf("Rejected after DATA: " | |
1810 | "could not verify \"%.*s\" header address\n%s: %s", | |
1811 | endname - h->text, h->text, vaddr->address, vaddr->message); | |
1812 | } | |
8e669ac1 | 1813 | } |
059ec3d9 PH |
1814 | |
1815 | /* Success or defer */ | |
1816 | ||
1817 | if (new_ok == OK) return OK; | |
1818 | if (new_ok == DEFER) yield = DEFER; | |
1819 | ||
1820 | /* Move on to any more addresses in the header */ | |
1821 | ||
1822 | s = ss; | |
1823 | } | |
1824 | } | |
1825 | } | |
1826 | ||
1827 | if (yield == FAIL && *log_msgptr == NULL) | |
1828 | *log_msgptr = US"there is no valid sender in any header line"; | |
1829 | ||
1830 | if (yield == DEFER && *log_msgptr == NULL) | |
1831 | *log_msgptr = US"all attempts to verify a sender in a header line deferred"; | |
1832 | ||
1833 | return yield; | |
1834 | } | |
1835 | ||
1836 | ||
1837 | ||
1838 | ||
1839 | /************************************************* | |
1840 | * Get RFC 1413 identification * | |
1841 | *************************************************/ | |
1842 | ||
1843 | /* Attempt to get an id from the sending machine via the RFC 1413 protocol. If | |
1844 | the timeout is set to zero, then the query is not done. There may also be lists | |
1845 | of hosts and nets which are exempt. To guard against malefactors sending | |
1846 | non-printing characters which could, for example, disrupt a message's headers, | |
1847 | make sure the string consists of printing characters only. | |
1848 | ||
1849 | Argument: | |
1850 | port the port to connect to; usually this is IDENT_PORT (113), but when | |
1851 | running in the test harness with -bh a different value is used. | |
1852 | ||
1853 | Returns: nothing | |
1854 | ||
1855 | Side effect: any received ident value is put in sender_ident (NULL otherwise) | |
1856 | */ | |
1857 | ||
1858 | void | |
1859 | verify_get_ident(int port) | |
1860 | { | |
1861 | int sock, host_af, qlen; | |
1862 | int received_sender_port, received_interface_port, n; | |
1863 | uschar *p; | |
1864 | uschar buffer[2048]; | |
1865 | ||
1866 | /* Default is no ident. Check whether we want to do an ident check for this | |
1867 | host. */ | |
1868 | ||
1869 | sender_ident = NULL; | |
1870 | if (rfc1413_query_timeout <= 0 || verify_check_host(&rfc1413_hosts) != OK) | |
1871 | return; | |
1872 | ||
1873 | DEBUG(D_ident) debug_printf("doing ident callback\n"); | |
1874 | ||
1875 | /* Set up a connection to the ident port of the remote host. Bind the local end | |
1876 | to the incoming interface address. If the sender host address is an IPv6 | |
1877 | address, the incoming interface address will also be IPv6. */ | |
1878 | ||
1879 | host_af = (Ustrchr(sender_host_address, ':') == NULL)? AF_INET : AF_INET6; | |
1880 | sock = ip_socket(SOCK_STREAM, host_af); | |
1881 | if (sock < 0) return; | |
1882 | ||
1883 | if (ip_bind(sock, host_af, interface_address, 0) < 0) | |
1884 | { | |
1885 | DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n", | |
1886 | strerror(errno)); | |
1887 | goto END_OFF; | |
1888 | } | |
1889 | ||
1890 | if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout) | |
1891 | < 0) | |
1892 | { | |
1893 | if (errno == ETIMEDOUT && (log_extra_selector & LX_ident_timeout) != 0) | |
1894 | { | |
1895 | log_write(0, LOG_MAIN, "ident connection to %s timed out", | |
1896 | sender_host_address); | |
1897 | } | |
1898 | else | |
1899 | { | |
1900 | DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n", | |
1901 | sender_host_address, strerror(errno)); | |
1902 | } | |
1903 | goto END_OFF; | |
1904 | } | |
1905 | ||
1906 | /* Construct and send the query. */ | |
1907 | ||
1908 | sprintf(CS buffer, "%d , %d\r\n", sender_host_port, interface_port); | |
1909 | qlen = Ustrlen(buffer); | |
1910 | if (send(sock, buffer, qlen, 0) < 0) | |
1911 | { | |
1912 | DEBUG(D_ident) debug_printf("ident send failed: %s\n", strerror(errno)); | |
1913 | goto END_OFF; | |
1914 | } | |
1915 | ||
1916 | /* Read a response line. We put it into the rest of the buffer, using several | |
1917 | recv() calls if necessary. */ | |
1918 | ||
1919 | p = buffer + qlen; | |
1920 | ||
1921 | for (;;) | |
1922 | { | |
1923 | uschar *pp; | |
1924 | int count; | |
1925 | int size = sizeof(buffer) - (p - buffer); | |
1926 | ||
1927 | if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */ | |
1928 | count = ip_recv(sock, p, size, rfc1413_query_timeout); | |
1929 | if (count <= 0) goto END_OFF; /* Read error or EOF */ | |
1930 | ||
1931 | /* Scan what we just read, to see if we have reached the terminating \r\n. Be | |
1932 | generous, and accept a plain \n terminator as well. The only illegal | |
1933 | character is 0. */ | |
1934 | ||
1935 | for (pp = p; pp < p + count; pp++) | |
1936 | { | |
1937 | if (*pp == 0) goto END_OFF; /* Zero octet not allowed */ | |
1938 | if (*pp == '\n') | |
1939 | { | |
1940 | if (pp[-1] == '\r') pp--; | |
1941 | *pp = 0; | |
1942 | goto GOT_DATA; /* Break out of both loops */ | |
1943 | } | |
1944 | } | |
1945 | ||
1946 | /* Reached the end of the data without finding \n. Let the loop continue to | |
1947 | read some more, if there is room. */ | |
1948 | ||
1949 | p = pp; | |
1950 | } | |
1951 | ||
1952 | GOT_DATA: | |
1953 | ||
1954 | /* We have received a line of data. Check it carefully. It must start with the | |
1955 | same two port numbers that we sent, followed by data as defined by the RFC. For | |
1956 | example, | |
1957 | ||
1958 | 12345 , 25 : USERID : UNIX :root | |
1959 | ||
1960 | However, the amount of white space may be different to what we sent. In the | |
1961 | "osname" field there may be several sub-fields, comma separated. The data we | |
1962 | actually want to save follows the third colon. Some systems put leading spaces | |
1963 | in it - we discard those. */ | |
1964 | ||
1965 | if (sscanf(CS buffer + qlen, "%d , %d%n", &received_sender_port, | |
1966 | &received_interface_port, &n) != 2 || | |
1967 | received_sender_port != sender_host_port || | |
1968 | received_interface_port != interface_port) | |
1969 | goto END_OFF; | |
1970 | ||
1971 | p = buffer + qlen + n; | |
1972 | while(isspace(*p)) p++; | |
1973 | if (*p++ != ':') goto END_OFF; | |
1974 | while(isspace(*p)) p++; | |
1975 | if (Ustrncmp(p, "USERID", 6) != 0) goto END_OFF; | |
1976 | p += 6; | |
1977 | while(isspace(*p)) p++; | |
1978 | if (*p++ != ':') goto END_OFF; | |
1979 | while (*p != 0 && *p != ':') p++; | |
1980 | if (*p++ == 0) goto END_OFF; | |
1981 | while(isspace(*p)) p++; | |
1982 | if (*p == 0) goto END_OFF; | |
1983 | ||
1984 | /* The rest of the line is the data we want. We turn it into printing | |
1985 | characters when we save it, so that it cannot mess up the format of any logging | |
1986 | or Received: lines into which it gets inserted. We keep a maximum of 127 | |
1987 | characters. */ | |
1988 | ||
1989 | sender_ident = string_printing(string_copyn(p, 127)); | |
1990 | DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident); | |
1991 | ||
1992 | END_OFF: | |
f1e894f3 | 1993 | (void)close(sock); |
059ec3d9 PH |
1994 | return; |
1995 | } | |
1996 | ||
1997 | ||
1998 | ||
1999 | ||
2000 | /************************************************* | |
2001 | * Match host to a single host-list item * | |
2002 | *************************************************/ | |
2003 | ||
2004 | /* This function compares a host (name or address) against a single item | |
2005 | from a host list. The host name gets looked up if it is needed and is not | |
2006 | already known. The function is called from verify_check_this_host() via | |
2007 | match_check_list(), which is why most of its arguments are in a single block. | |
2008 | ||
2009 | Arguments: | |
2010 | arg the argument block (see below) | |
2011 | ss the host-list item | |
2012 | valueptr where to pass back looked up data, or NULL | |
2013 | error for error message when returning ERROR | |
2014 | ||
2015 | The block contains: | |
32d668a5 PH |
2016 | host_name (a) the host name, or |
2017 | (b) NULL, implying use sender_host_name and | |
2018 | sender_host_aliases, looking them up if required, or | |
2019 | (c) the empty string, meaning that only IP address matches | |
2020 | are permitted | |
059ec3d9 PH |
2021 | host_address the host address |
2022 | host_ipv4 the IPv4 address taken from an IPv6 one | |
2023 | ||
2024 | Returns: OK matched | |
2025 | FAIL did not match | |
2026 | DEFER lookup deferred | |
32d668a5 PH |
2027 | ERROR (a) failed to find the host name or IP address, or |
2028 | (b) unknown lookup type specified, or | |
2029 | (c) host name encountered when only IP addresses are | |
2030 | being matched | |
059ec3d9 PH |
2031 | */ |
2032 | ||
32d668a5 | 2033 | int |
059ec3d9 PH |
2034 | check_host(void *arg, uschar *ss, uschar **valueptr, uschar **error) |
2035 | { | |
2036 | check_host_block *cb = (check_host_block *)arg; | |
32d668a5 | 2037 | int mlen = -1; |
059ec3d9 | 2038 | int maskoffset; |
32d668a5 | 2039 | BOOL iplookup = FALSE; |
059ec3d9 | 2040 | BOOL isquery = FALSE; |
32d668a5 | 2041 | BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0; |
1688f43b | 2042 | uschar *t; |
32d668a5 | 2043 | uschar *semicolon; |
059ec3d9 PH |
2044 | uschar **aliases; |
2045 | ||
2046 | /* Optimize for the special case when the pattern is "*". */ | |
2047 | ||
2048 | if (*ss == '*' && ss[1] == 0) return OK; | |
2049 | ||
2050 | /* If the pattern is empty, it matches only in the case when there is no host - | |
2051 | this can occur in ACL checking for SMTP input using the -bs option. In this | |
2052 | situation, the host address is the empty string. */ | |
2053 | ||
2054 | if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL; | |
2055 | if (*ss == 0) return FAIL; | |
2056 | ||
32d668a5 PH |
2057 | /* If the pattern is precisely "@" then match against the primary host name, |
2058 | provided that host name matching is permitted; if it's "@[]" match against the | |
2059 | local host's IP addresses. */ | |
059ec3d9 PH |
2060 | |
2061 | if (*ss == '@') | |
2062 | { | |
32d668a5 PH |
2063 | if (ss[1] == 0) |
2064 | { | |
2065 | if (isiponly) return ERROR; | |
2066 | ss = primary_hostname; | |
2067 | } | |
059ec3d9 PH |
2068 | else if (Ustrcmp(ss, "@[]") == 0) |
2069 | { | |
2070 | ip_address_item *ip; | |
2071 | for (ip = host_find_interfaces(); ip != NULL; ip = ip->next) | |
2072 | if (Ustrcmp(ip->address, cb->host_address) == 0) return OK; | |
2073 | return FAIL; | |
2074 | } | |
2075 | } | |
2076 | ||
2077 | /* If the pattern is an IP address, optionally followed by a bitmask count, do | |
2078 | a (possibly masked) comparision with the current IP address. */ | |
2079 | ||
7e66e54d | 2080 | if (string_is_ip_address(ss, &maskoffset) != 0) |
059ec3d9 PH |
2081 | return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL); |
2082 | ||
1688f43b PH |
2083 | /* The pattern is not an IP address. A common error that people make is to omit |
2084 | one component of an IPv4 address, either by accident, or believing that, for | |
2085 | 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, | |
2086 | which it isn't. (Those applications that do accept 1.2.3 as an IP address | |
2087 | interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an | |
2088 | ancient specification.) To aid in debugging these cases, we give a specific | |
2089 | error if the pattern contains only digits and dots or contains a slash preceded | |
2090 | only by digits and dots (a slash at the start indicates a file name and of | |
2091 | course slashes may be present in lookups, but not preceded only by digits and | |
2092 | dots). */ | |
2093 | ||
2094 | for (t = ss; isdigit(*t) || *t == '.'; t++); | |
2095 | if (*t == 0 || (*t == '/' && t != ss)) | |
2096 | { | |
2097 | *error = US"malformed IPv4 address or address mask"; | |
2098 | return ERROR; | |
2099 | } | |
2100 | ||
32d668a5 | 2101 | /* See if there is a semicolon in the pattern */ |
059ec3d9 | 2102 | |
32d668a5 PH |
2103 | semicolon = Ustrchr(ss, ';'); |
2104 | ||
2105 | /* If we are doing an IP address only match, then all lookups must be IP | |
df199fec | 2106 | address lookups, even if there is no "net-". */ |
32d668a5 PH |
2107 | |
2108 | if (isiponly) | |
059ec3d9 | 2109 | { |
32d668a5 PH |
2110 | iplookup = semicolon != NULL; |
2111 | } | |
059ec3d9 | 2112 | |
32d668a5 | 2113 | /* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is |
df199fec PH |
2114 | a lookup on a masked IP network, in textual form. We obey this code even if we |
2115 | have already set iplookup, so as to skip over the "net-" prefix and to set the | |
2116 | mask length. The net- stuff really only applies to single-key lookups where the | |
2117 | key is implicit. For query-style lookups the key is specified in the query. | |
2118 | From release 4.30, the use of net- for query style is no longer needed, but we | |
2119 | retain it for backward compatibility. */ | |
2120 | ||
2121 | if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL) | |
32d668a5 PH |
2122 | { |
2123 | mlen = 0; | |
2124 | for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0'; | |
2125 | if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */ | |
2126 | iplookup = (*t++ == '-'); | |
2127 | } | |
1688f43b | 2128 | else t = ss; |
059ec3d9 | 2129 | |
32d668a5 | 2130 | /* Do the IP address lookup if that is indeed what we have */ |
059ec3d9 | 2131 | |
32d668a5 PH |
2132 | if (iplookup) |
2133 | { | |
2134 | int insize; | |
2135 | int search_type; | |
2136 | int incoming[4]; | |
2137 | void *handle; | |
2138 | uschar *filename, *key, *result; | |
2139 | uschar buffer[64]; | |
059ec3d9 | 2140 | |
32d668a5 | 2141 | /* Find the search type */ |
059ec3d9 | 2142 | |
32d668a5 | 2143 | search_type = search_findtype(t, semicolon - t); |
059ec3d9 | 2144 | |
32d668a5 PH |
2145 | if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", |
2146 | search_error_message); | |
059ec3d9 | 2147 | |
13b685f9 PH |
2148 | /* Adjust parameters for the type of lookup. For a query-style lookup, there |
2149 | is no file name, and the "key" is just the query. For query-style with a file | |
2150 | name, we have to fish the file off the start of the query. For a single-key | |
2151 | lookup, the key is the current IP address, masked appropriately, and | |
2152 | reconverted to text form, with the mask appended. For IPv6 addresses, specify | |
2153 | dot separators instead of colons. */ | |
059ec3d9 | 2154 | |
13b685f9 PH |
2155 | if (mac_islookup(search_type, lookup_absfilequery)) |
2156 | { | |
2157 | filename = semicolon + 1; | |
2158 | key = filename; | |
2159 | while (*key != 0 && !isspace(*key)) key++; | |
2160 | filename = string_copyn(filename, key - filename); | |
2161 | while (isspace(*key)) key++; | |
2162 | } | |
2163 | else if (mac_islookup(search_type, lookup_querystyle)) | |
32d668a5 PH |
2164 | { |
2165 | filename = NULL; | |
2166 | key = semicolon + 1; | |
2167 | } | |
2168 | else | |
2169 | { | |
2170 | insize = host_aton(cb->host_address, incoming); | |
2171 | host_mask(insize, incoming, mlen); | |
2172 | (void)host_nmtoa(insize, incoming, mlen, buffer, '.'); | |
2173 | key = buffer; | |
2174 | filename = semicolon + 1; | |
059ec3d9 | 2175 | } |
32d668a5 PH |
2176 | |
2177 | /* Now do the actual lookup; note that there is no search_close() because | |
2178 | of the caching arrangements. */ | |
2179 | ||
2180 | handle = search_open(filename, search_type, 0, NULL, NULL); | |
2181 | if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", | |
2182 | search_error_message); | |
2183 | result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL); | |
2184 | if (valueptr != NULL) *valueptr = result; | |
2185 | return (result != NULL)? OK : search_find_defer? DEFER: FAIL; | |
059ec3d9 PH |
2186 | } |
2187 | ||
2188 | /* The pattern is not an IP address or network reference of any kind. That is, | |
32d668a5 PH |
2189 | it is a host name pattern. If this is an IP only match, there's an error in the |
2190 | host list. */ | |
2191 | ||
2192 | if (isiponly) | |
2193 | { | |
2194 | *error = US"cannot match host name in match_ip list"; | |
2195 | return ERROR; | |
2196 | } | |
2197 | ||
2198 | /* Check the characters of the pattern to see if they comprise only letters, | |
2199 | digits, full stops, and hyphens (the constituents of domain names). Allow | |
2200 | underscores, as they are all too commonly found. Sigh. Also, if | |
2201 | allow_utf8_domains is set, allow top-bit characters. */ | |
059ec3d9 PH |
2202 | |
2203 | for (t = ss; *t != 0; t++) | |
2204 | if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' && | |
2205 | (!allow_utf8_domains || *t < 128)) break; | |
2206 | ||
2207 | /* If the pattern is a complete domain name, with no fancy characters, look up | |
2208 | its IP address and match against that. Note that a multi-homed host will add | |
2209 | items to the chain. */ | |
2210 | ||
2211 | if (*t == 0) | |
2212 | { | |
2213 | int rc; | |
2214 | host_item h; | |
2215 | h.next = NULL; | |
2216 | h.name = ss; | |
2217 | h.address = NULL; | |
2218 | h.mx = MX_NONE; | |
9b8fadde | 2219 | |
322050c2 | 2220 | rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE); |
059ec3d9 PH |
2221 | if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL) |
2222 | { | |
2223 | host_item *hh; | |
2224 | for (hh = &h; hh != NULL; hh = hh->next) | |
2225 | { | |
96776534 | 2226 | if (host_is_in_net(hh->address, cb->host_address, 0)) return OK; |
059ec3d9 PH |
2227 | } |
2228 | return FAIL; | |
2229 | } | |
2230 | if (rc == HOST_FIND_AGAIN) return DEFER; | |
2231 | *error = string_sprintf("failed to find IP address for %s", ss); | |
2232 | return ERROR; | |
2233 | } | |
2234 | ||
2235 | /* Almost all subsequent comparisons require the host name, and can be done | |
2236 | using the general string matching function. When this function is called for | |
2237 | outgoing hosts, the name is always given explicitly. If it is NULL, it means we | |
2238 | must use sender_host_name and its aliases, looking them up if necessary. */ | |
2239 | ||
2240 | if (cb->host_name != NULL) /* Explicit host name given */ | |
2241 | return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE, | |
2242 | valueptr); | |
2243 | ||
2244 | /* Host name not given; in principle we need the sender host name and its | |
2245 | aliases. However, for query-style lookups, we do not need the name if the | |
2246 | query does not contain $sender_host_name. From release 4.23, a reference to | |
2247 | $sender_host_name causes it to be looked up, so we don't need to do the lookup | |
2248 | on spec. */ | |
2249 | ||
2250 | if ((semicolon = Ustrchr(ss, ';')) != NULL) | |
2251 | { | |
2252 | uschar *affix; | |
2253 | int partial, affixlen, starflags, id; | |
2254 | ||
2255 | *semicolon = 0; | |
2256 | id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags); | |
2257 | *semicolon=';'; | |
2258 | ||
2259 | if (id < 0) /* Unknown lookup type */ | |
2260 | { | |
2261 | log_write(0, LOG_MAIN|LOG_PANIC, "%s in host list item \"%s\"", | |
2262 | search_error_message, ss); | |
2263 | return DEFER; | |
2264 | } | |
13b685f9 | 2265 | isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery); |
059ec3d9 PH |
2266 | } |
2267 | ||
2268 | if (isquery) | |
2269 | { | |
2270 | switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr)) | |
2271 | { | |
2272 | case OK: return OK; | |
2273 | case DEFER: return DEFER; | |
2274 | default: return FAIL; | |
2275 | } | |
2276 | } | |
2277 | ||
2278 | /* Not a query-style lookup; must ensure the host name is present, and then we | |
2279 | do a check on the name and all its aliases. */ | |
2280 | ||
2281 | if (sender_host_name == NULL) | |
2282 | { | |
2283 | HDEBUG(D_host_lookup) | |
2284 | debug_printf("sender host name required, to match against %s\n", ss); | |
2285 | if (host_lookup_failed || host_name_lookup() != OK) | |
2286 | { | |
2287 | *error = string_sprintf("failed to find host name for %s", | |
2288 | sender_host_address);; | |
2289 | return ERROR; | |
2290 | } | |
2291 | host_build_sender_fullhost(); | |
2292 | } | |
2293 | ||
2294 | /* Match on the sender host name, using the general matching function */ | |
2295 | ||
2296 | switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE, | |
2297 | valueptr)) | |
2298 | { | |
2299 | case OK: return OK; | |
2300 | case DEFER: return DEFER; | |
2301 | } | |
2302 | ||
2303 | /* If there are aliases, try matching on them. */ | |
2304 | ||
2305 | aliases = sender_host_aliases; | |
2306 | while (*aliases != NULL) | |
2307 | { | |
2308 | switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr)) | |
2309 | { | |
2310 | case OK: return OK; | |
2311 | case DEFER: return DEFER; | |
2312 | } | |
2313 | } | |
2314 | return FAIL; | |
2315 | } | |
2316 | ||
2317 | ||
2318 | ||
2319 | ||
2320 | /************************************************* | |
2321 | * Check a specific host matches a host list * | |
2322 | *************************************************/ | |
2323 | ||
2324 | /* This function is passed a host list containing items in a number of | |
2325 | different formats and the identity of a host. Its job is to determine whether | |
2326 | the given host is in the set of hosts defined by the list. The host name is | |
2327 | passed as a pointer so that it can be looked up if needed and not already | |
2328 | known. This is commonly the case when called from verify_check_host() to check | |
2329 | an incoming connection. When called from elsewhere the host name should usually | |
2330 | be set. | |
2331 | ||
2332 | This function is now just a front end to match_check_list(), which runs common | |
2333 | code for scanning a list. We pass it the check_host() function to perform a | |
2334 | single test. | |
2335 | ||
2336 | Arguments: | |
2337 | listptr pointer to the host list | |
2338 | cache_bits pointer to cache for named lists, or NULL | |
2339 | host_name the host name or NULL, implying use sender_host_name and | |
2340 | sender_host_aliases, looking them up if required | |
2341 | host_address the IP address | |
2342 | valueptr if not NULL, data from a lookup is passed back here | |
2343 | ||
2344 | Returns: OK if the host is in the defined set | |
2345 | FAIL if the host is not in the defined set, | |
2346 | DEFER if a data lookup deferred (not a host lookup) | |
2347 | ||
2348 | If the host name was needed in order to make a comparison, and could not be | |
2349 | determined from the IP address, the result is FAIL unless the item | |
2350 | "+allow_unknown" was met earlier in the list, in which case OK is returned. */ | |
2351 | ||
2352 | int | |
2353 | verify_check_this_host(uschar **listptr, unsigned int *cache_bits, | |
2354 | uschar *host_name, uschar *host_address, uschar **valueptr) | |
2355 | { | |
d4eb88df | 2356 | int rc; |
059ec3d9 | 2357 | unsigned int *local_cache_bits = cache_bits; |
d4eb88df | 2358 | uschar *save_host_address = deliver_host_address; |
059ec3d9 PH |
2359 | check_host_block cb; |
2360 | cb.host_name = host_name; | |
2361 | cb.host_address = host_address; | |
2362 | ||
2363 | if (valueptr != NULL) *valueptr = NULL; | |
2364 | ||
2365 | /* If the host address starts off ::ffff: it is an IPv6 address in | |
2366 | IPv4-compatible mode. Find the IPv4 part for checking against IPv4 | |
2367 | addresses. */ | |
2368 | ||
2369 | cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)? | |
2370 | host_address + 7 : host_address; | |
2371 | ||
8e669ac1 PH |
2372 | /* During the running of the check, put the IP address into $host_address. In |
2373 | the case of calls from the smtp transport, it will already be there. However, | |
2374 | in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on | |
d4eb88df PH |
2375 | the safe side, any existing setting is preserved, though as I write this |
2376 | (November 2004) I can't see any cases where it is actually needed. */ | |
2377 | ||
2378 | deliver_host_address = host_address; | |
2379 | rc = match_check_list( | |
2380 | listptr, /* the list */ | |
2381 | 0, /* separator character */ | |
2382 | &hostlist_anchor, /* anchor pointer */ | |
2383 | &local_cache_bits, /* cache pointer */ | |
2384 | check_host, /* function for testing */ | |
2385 | &cb, /* argument for function */ | |
2386 | MCL_HOST, /* type of check */ | |
8e669ac1 | 2387 | (host_address == sender_host_address)? |
d4eb88df PH |
2388 | US"host" : host_address, /* text for debugging */ |
2389 | valueptr); /* where to pass back data */ | |
2390 | deliver_host_address = save_host_address; | |
8e669ac1 | 2391 | return rc; |
059ec3d9 PH |
2392 | } |
2393 | ||
2394 | ||
2395 | ||
2396 | ||
2397 | /************************************************* | |
2398 | * Check the remote host matches a list * | |
2399 | *************************************************/ | |
2400 | ||
2401 | /* This is a front end to verify_check_this_host(), created because checking | |
2402 | the remote host is a common occurrence. With luck, a good compiler will spot | |
2403 | the tail recursion and optimize it. If there's no host address, this is | |
2404 | command-line SMTP input - check against an empty string for the address. | |
2405 | ||
2406 | Arguments: | |
2407 | listptr pointer to the host list | |
2408 | ||
2409 | Returns: the yield of verify_check_this_host(), | |
2410 | i.e. OK, FAIL, or DEFER | |
2411 | */ | |
2412 | ||
2413 | int | |
2414 | verify_check_host(uschar **listptr) | |
2415 | { | |
2416 | return verify_check_this_host(listptr, sender_host_cache, NULL, | |
2417 | (sender_host_address == NULL)? US"" : sender_host_address, NULL); | |
2418 | } | |
2419 | ||
2420 | ||
2421 | ||
2422 | ||
2423 | ||
2424 | /************************************************* | |
2425 | * Invert an IP address for a DNS black list * | |
2426 | *************************************************/ | |
2427 | ||
2428 | /* | |
2429 | Arguments: | |
2430 | buffer where to put the answer | |
2431 | address the address to invert | |
2432 | */ | |
2433 | ||
2434 | static void | |
2435 | invert_address(uschar *buffer, uschar *address) | |
2436 | { | |
2437 | int bin[4]; | |
2438 | uschar *bptr = buffer; | |
2439 | ||
2440 | /* If this is an IPv4 address mapped into IPv6 format, adjust the pointer | |
2441 | to the IPv4 part only. */ | |
2442 | ||
2443 | if (Ustrncmp(address, "::ffff:", 7) == 0) address += 7; | |
2444 | ||
2445 | /* Handle IPv4 address: when HAVE_IPV6 is false, the result of host_aton() is | |
2446 | always 1. */ | |
2447 | ||
2448 | if (host_aton(address, bin) == 1) | |
2449 | { | |
2450 | int i; | |
2451 | int x = bin[0]; | |
2452 | for (i = 0; i < 4; i++) | |
2453 | { | |
2454 | sprintf(CS bptr, "%d.", x & 255); | |
2455 | while (*bptr) bptr++; | |
2456 | x >>= 8; | |
2457 | } | |
2458 | } | |
2459 | ||
2460 | /* Handle IPv6 address. Actually, as far as I know, there are no IPv6 addresses | |
2461 | in any DNS black lists, and the format in which they will be looked up is | |
2462 | unknown. This is just a guess. */ | |
2463 | ||
2464 | #if HAVE_IPV6 | |
2465 | else | |
2466 | { | |
2467 | int i, j; | |
2468 | for (j = 3; j >= 0; j--) | |
2469 | { | |
2470 | int x = bin[j]; | |
2471 | for (i = 0; i < 8; i++) | |
2472 | { | |
2473 | sprintf(CS bptr, "%x.", x & 15); | |
2474 | while (*bptr) bptr++; | |
2475 | x >>= 4; | |
2476 | } | |
2477 | } | |
2478 | } | |
2479 | #endif | |
d6f6e0dc PH |
2480 | |
2481 | /* Remove trailing period -- this is needed so that both arbitrary | |
2482 | dnsbl keydomains and inverted addresses may be combined with the | |
2483 | same format string, "%s.%s" */ | |
2484 | ||
2485 | *(--bptr) = 0; | |
059ec3d9 PH |
2486 | } |
2487 | ||
2488 | ||
2489 | ||
0bcb2a0e PH |
2490 | /************************************************* |
2491 | * Perform a single dnsbl lookup * | |
2492 | *************************************************/ | |
2493 | ||
d6f6e0dc PH |
2494 | /* This function is called from verify_check_dnsbl() below. It is also called |
2495 | recursively from within itself when domain and domain_txt are different | |
2496 | pointers, in order to get the TXT record from the alternate domain. | |
0bcb2a0e PH |
2497 | |
2498 | Arguments: | |
d6f6e0dc PH |
2499 | domain the outer dnsbl domain |
2500 | domain_txt alternate domain to lookup TXT record on success; when the | |
2501 | same domain is to be used, domain_txt == domain (that is, | |
2502 | the pointers must be identical, not just the text) | |
8e669ac1 | 2503 | keydomain the current keydomain (for debug message) |
d6f6e0dc PH |
2504 | prepend subdomain to lookup (like keydomain, but |
2505 | reversed if IP address) | |
2506 | iplist the list of matching IP addresses, or NULL for "any" | |
8e669ac1 PH |
2507 | bitmask true if bitmask matching is wanted |
2508 | invert_result true if result to be inverted | |
2509 | defer_return what to return for a defer | |
0bcb2a0e PH |
2510 | |
2511 | Returns: OK if lookup succeeded | |
2512 | FAIL if not | |
2513 | */ | |
2514 | ||
2515 | static int | |
d6f6e0dc PH |
2516 | one_check_dnsbl(uschar *domain, uschar *domain_txt, uschar *keydomain, |
2517 | uschar *prepend, uschar *iplist, BOOL bitmask, BOOL invert_result, | |
2518 | int defer_return) | |
8e669ac1 | 2519 | { |
0bcb2a0e PH |
2520 | dns_answer dnsa; |
2521 | dns_scan dnss; | |
2522 | tree_node *t; | |
2523 | dnsbl_cache_block *cb; | |
2524 | int old_pool = store_pool; | |
d6f6e0dc PH |
2525 | uschar query[256]; /* DNS domain max length */ |
2526 | ||
2527 | /* Construct the specific query domainname */ | |
2528 | ||
2529 | if (!string_format(query, sizeof(query), "%s.%s", prepend, domain)) | |
2530 | { | |
2531 | log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long " | |
2532 | "(ignored): %s...", query); | |
2533 | return FAIL; | |
2534 | } | |
0bcb2a0e PH |
2535 | |
2536 | /* Look for this query in the cache. */ | |
2537 | ||
2538 | t = tree_search(dnsbl_cache, query); | |
2539 | ||
2540 | /* If not cached from a previous lookup, we must do a DNS lookup, and | |
2541 | cache the result in permanent memory. */ | |
2542 | ||
2543 | if (t == NULL) | |
2544 | { | |
2545 | store_pool = POOL_PERM; | |
2546 | ||
2547 | /* Set up a tree entry to cache the lookup */ | |
2548 | ||
2549 | t = store_get(sizeof(tree_node) + Ustrlen(query)); | |
2550 | Ustrcpy(t->name, query); | |
2551 | t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block)); | |
2552 | (void)tree_insertnode(&dnsbl_cache, t); | |
2553 | ||
2554 | /* Do the DNS loopup . */ | |
2555 | ||
2556 | HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query); | |
2557 | cb->rc = dns_basic_lookup(&dnsa, query, T_A); | |
2558 | cb->text_set = FALSE; | |
2559 | cb->text = NULL; | |
2560 | cb->rhs = NULL; | |
2561 | ||
2562 | /* If the lookup succeeded, cache the RHS address. The code allows for | |
2563 | more than one address - this was for complete generality and the possible | |
2564 | use of A6 records. However, A6 records have been reduced to experimental | |
2565 | status (August 2001) and may die out. So they may never get used at all, | |
2566 | let alone in dnsbl records. However, leave the code here, just in case. | |
2567 | ||
2568 | Quite apart from one A6 RR generating multiple addresses, there are DNS | |
2569 | lists that return more than one A record, so we must handle multiple | |
2570 | addresses generated in that way as well. */ | |
2571 | ||
2572 | if (cb->rc == DNS_SUCCEED) | |
2573 | { | |
2574 | dns_record *rr; | |
2575 | dns_address **addrp = &(cb->rhs); | |
2576 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
2577 | rr != NULL; | |
2578 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
2579 | { | |
2580 | if (rr->type == T_A) | |
2581 | { | |
2582 | dns_address *da = dns_address_from_rr(&dnsa, rr); | |
2583 | if (da != NULL) | |
2584 | { | |
2585 | *addrp = da; | |
2586 | while (da->next != NULL) da = da->next; | |
2587 | addrp = &(da->next); | |
2588 | } | |
2589 | } | |
2590 | } | |
2591 | ||
2592 | /* If we didn't find any A records, change the return code. This can | |
2593 | happen when there is a CNAME record but there are no A records for what | |
2594 | it points to. */ | |
2595 | ||
2596 | if (cb->rhs == NULL) cb->rc = DNS_NODATA; | |
2597 | } | |
2598 | ||
2599 | store_pool = old_pool; | |
2600 | } | |
2601 | ||
2602 | /* Previous lookup was cached */ | |
2603 | ||
2604 | else | |
2605 | { | |
2606 | HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n"); | |
2607 | cb = t->data.ptr; | |
2608 | } | |
2609 | ||
2610 | /* We now have the result of the DNS lookup, either newly done, or cached | |
2611 | from a previous call. If the lookup succeeded, check against the address | |
2612 | list if there is one. This may be a positive equality list (introduced by | |
2613 | "="), a negative equality list (introduced by "!="), a positive bitmask | |
2614 | list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/ | |
2615 | ||
2616 | if (cb->rc == DNS_SUCCEED) | |
2617 | { | |
2618 | dns_address *da = NULL; | |
2619 | uschar *addlist = cb->rhs->address; | |
2620 | ||
2621 | /* For A and AAAA records, there may be multiple addresses from multiple | |
2622 | records. For A6 records (currently not expected to be used) there may be | |
2623 | multiple addresses from a single record. */ | |
2624 | ||
2625 | for (da = cb->rhs->next; da != NULL; da = da->next) | |
2626 | addlist = string_sprintf("%s, %s", addlist, da->address); | |
2627 | ||
2628 | HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n", | |
2629 | query, addlist); | |
2630 | ||
2631 | /* Address list check; this can be either for equality, or via a bitmask. | |
2632 | In the latter case, all the bits must match. */ | |
2633 | ||
2634 | if (iplist != NULL) | |
2635 | { | |
2636 | int ipsep = ','; | |
2637 | uschar ip[46]; | |
2638 | uschar *ptr = iplist; | |
2639 | ||
2640 | while (string_nextinlist(&ptr, &ipsep, ip, sizeof(ip)) != NULL) | |
2641 | { | |
2642 | /* Handle exact matching */ | |
2643 | if (!bitmask) | |
2644 | { | |
2645 | for (da = cb->rhs; da != NULL; da = da->next) | |
2646 | { | |
2647 | if (Ustrcmp(CS da->address, ip) == 0) break; | |
2648 | } | |
2649 | } | |
2650 | /* Handle bitmask matching */ | |
2651 | else | |
2652 | { | |
2653 | int address[4]; | |
2654 | int mask = 0; | |
2655 | ||
2656 | /* At present, all known DNS blocking lists use A records, with | |
2657 | IPv4 addresses on the RHS encoding the information they return. I | |
2658 | wonder if this will linger on as the last vestige of IPv4 when IPv6 | |
2659 | is ubiquitous? Anyway, for now we use paranoia code to completely | |
2660 | ignore IPv6 addresses. The default mask is 0, which always matches. | |
2661 | We change this only for IPv4 addresses in the list. */ | |
2662 | ||
2663 | if (host_aton(ip, address) == 1) mask = address[0]; | |
2664 | ||
2665 | /* Scan the returned addresses, skipping any that are IPv6 */ | |
2666 | ||
2667 | for (da = cb->rhs; da != NULL; da = da->next) | |
2668 | { | |
2669 | if (host_aton(da->address, address) != 1) continue; | |
2670 | if ((address[0] & mask) == mask) break; | |
2671 | } | |
2672 | } | |
2673 | ||
2674 | /* Break out if a match has been found */ | |
2675 | ||
2676 | if (da != NULL) break; | |
2677 | } | |
2678 | ||
2679 | /* If either | |
2680 | ||
2681 | (a) No IP address in a positive list matched, or | |
2682 | (b) An IP address in a negative list did match | |
2683 | ||
2684 | then behave as if the DNSBL lookup had not succeeded, i.e. the host is | |
2685 | not on the list. */ | |
2686 | ||
2687 | if (invert_result != (da == NULL)) | |
2688 | { | |
2689 | HDEBUG(D_dnsbl) | |
2690 | { | |
2691 | debug_printf("=> but we are not accepting this block class because\n"); | |
2692 | debug_printf("=> there was %s match for %c%s\n", | |
2693 | invert_result? "an exclude":"no", bitmask? '&' : '=', iplist); | |
2694 | } | |
8e669ac1 | 2695 | return FAIL; |
0bcb2a0e PH |
2696 | } |
2697 | } | |
2698 | ||
d6f6e0dc PH |
2699 | /* Either there was no IP list, or the record matched, implying that the |
2700 | domain is on the list. We now want to find a corresponding TXT record. If an | |
2701 | alternate domain is specified for the TXT record, call this function | |
2702 | recursively to look that up; this has the side effect of re-checking that | |
2703 | there is indeed an A record at the alternate domain. */ | |
2704 | ||
2705 | if (domain_txt != domain) | |
2706 | return one_check_dnsbl(domain_txt, domain_txt, keydomain, prepend, NULL, | |
2707 | FALSE, invert_result, defer_return); | |
2708 | ||
2709 | /* If there is no alternate domain, look up a TXT record in the main domain | |
2710 | if it has not previously been cached. */ | |
0bcb2a0e PH |
2711 | |
2712 | if (!cb->text_set) | |
2713 | { | |
2714 | cb->text_set = TRUE; | |
2715 | if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED) | |
2716 | { | |
2717 | dns_record *rr; | |
2718 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
2719 | rr != NULL; | |
2720 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
2721 | if (rr->type == T_TXT) break; | |
2722 | if (rr != NULL) | |
2723 | { | |
2724 | int len = (rr->data)[0]; | |
2725 | if (len > 511) len = 127; | |
2726 | store_pool = POOL_PERM; | |
2727 | cb->text = string_sprintf("%.*s", len, (const uschar *)(rr->data+1)); | |
2728 | store_pool = old_pool; | |
2729 | } | |
2730 | } | |
2731 | } | |
2732 | ||
2733 | dnslist_value = addlist; | |
2734 | dnslist_text = cb->text; | |
2735 | return OK; | |
2736 | } | |
2737 | ||
2738 | /* There was a problem with the DNS lookup */ | |
2739 | ||
2740 | if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA) | |
2741 | { | |
2742 | log_write(L_dnslist_defer, LOG_MAIN, | |
2743 | "DNS list lookup defer (probably timeout) for %s: %s", query, | |
2744 | (defer_return == OK)? US"assumed in list" : | |
2745 | (defer_return == FAIL)? US"assumed not in list" : | |
2746 | US"returned DEFER"); | |
2747 | return defer_return; | |
2748 | } | |
2749 | ||
2750 | /* No entry was found in the DNS; continue for next domain */ | |
2751 | ||
2752 | HDEBUG(D_dnsbl) | |
2753 | { | |
2754 | debug_printf("DNS lookup for %s failed\n", query); | |
2755 | debug_printf("=> that means %s is not listed at %s\n", | |
2756 | keydomain, domain); | |
2757 | } | |
2758 | ||
2759 | return FAIL; | |
2760 | } | |
2761 | ||
2762 | ||
2763 | ||
2764 | ||
059ec3d9 PH |
2765 | /************************************************* |
2766 | * Check host against DNS black lists * | |
2767 | *************************************************/ | |
2768 | ||
2769 | /* This function runs checks against a list of DNS black lists, until one | |
2770 | matches. Each item on the list can be of the form | |
2771 | ||
2772 | domain=ip-address/key | |
2773 | ||
2774 | The domain is the right-most domain that is used for the query, for example, | |
2775 | blackholes.mail-abuse.org. If the IP address is present, there is a match only | |
2776 | if the DNS lookup returns a matching IP address. Several addresses may be | |
2777 | given, comma-separated, for example: x.y.z=127.0.0.1,127.0.0.2. | |
2778 | ||
2779 | If no key is given, what is looked up in the domain is the inverted IP address | |
2780 | of the current client host. If a key is given, it is used to construct the | |
d6f6e0dc | 2781 | domain for the lookup. For example: |
059ec3d9 PH |
2782 | |
2783 | dsn.rfc-ignorant.org/$sender_address_domain | |
2784 | ||
2785 | After finding a match in the DNS, the domain is placed in $dnslist_domain, and | |
2786 | then we check for a TXT record for an error message, and if found, save its | |
2787 | value in $dnslist_text. We also cache everything in a tree, to optimize | |
2788 | multiple lookups. | |
2789 | ||
d6f6e0dc PH |
2790 | The TXT record is normally looked up in the same domain as the A record, but |
2791 | when many lists are combined in a single DNS domain, this will not be a very | |
2792 | specific message. It is possible to specify a different domain for looking up | |
2793 | TXT records; this is given before the main domain, comma-separated. For | |
2794 | example: | |
2795 | ||
2796 | dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \ | |
2797 | socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3 | |
2798 | ||
2799 | The caching ensures that only one lookup in dnsbl.sorbs.net is done. | |
2800 | ||
059ec3d9 PH |
2801 | Note: an address for testing RBL is 192.203.178.39 |
2802 | Note: an address for testing DUL is 192.203.178.4 | |
2803 | Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org | |
2804 | ||
2805 | Arguments: | |
2806 | listptr the domain/address/data list | |
2807 | ||
2808 | Returns: OK successful lookup (i.e. the address is on the list), or | |
2809 | lookup deferred after +include_unknown | |
2810 | FAIL name not found, or no data found for the given type, or | |
2811 | lookup deferred after +exclude_unknown (default) | |
2812 | DEFER lookup failure, if +defer_unknown was set | |
2813 | */ | |
2814 | ||
2815 | int | |
2816 | verify_check_dnsbl(uschar **listptr) | |
2817 | { | |
2818 | int sep = 0; | |
2819 | int defer_return = FAIL; | |
059ec3d9 PH |
2820 | BOOL invert_result = FALSE; |
2821 | uschar *list = *listptr; | |
2822 | uschar *domain; | |
2823 | uschar *s; | |
2824 | uschar buffer[1024]; | |
059ec3d9 PH |
2825 | uschar revadd[128]; /* Long enough for IPv6 address */ |
2826 | ||
2827 | /* Indicate that the inverted IP address is not yet set up */ | |
2828 | ||
2829 | revadd[0] = 0; | |
2830 | ||
0bcb2a0e PH |
2831 | /* In case this is the first time the DNS resolver is being used. */ |
2832 | ||
2833 | dns_init(FALSE, FALSE); | |
2834 | ||
059ec3d9 PH |
2835 | /* Loop through all the domains supplied, until something matches */ |
2836 | ||
2837 | while ((domain = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL) | |
2838 | { | |
0bcb2a0e | 2839 | int rc; |
059ec3d9 | 2840 | BOOL bitmask = FALSE; |
d6f6e0dc PH |
2841 | uschar *domain_txt; |
2842 | uschar *comma; | |
059ec3d9 PH |
2843 | uschar *iplist; |
2844 | uschar *key; | |
059ec3d9 PH |
2845 | |
2846 | HDEBUG(D_dnsbl) debug_printf("DNS list check: %s\n", domain); | |
2847 | ||
2848 | /* Deal with special values that change the behaviour on defer */ | |
2849 | ||
2850 | if (domain[0] == '+') | |
2851 | { | |
2852 | if (strcmpic(domain, US"+include_unknown") == 0) defer_return = OK; | |
2853 | else if (strcmpic(domain, US"+exclude_unknown") == 0) defer_return = FAIL; | |
2854 | else if (strcmpic(domain, US"+defer_unknown") == 0) defer_return = DEFER; | |
2855 | else | |
2856 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown item in dnslist (ignored): %s", | |
2857 | domain); | |
2858 | continue; | |
2859 | } | |
2860 | ||
2861 | /* See if there's explicit data to be looked up */ | |
2862 | ||
2863 | key = Ustrchr(domain, '/'); | |
2864 | if (key != NULL) *key++ = 0; | |
2865 | ||
2866 | /* See if there's a list of addresses supplied after the domain name. This is | |
2867 | introduced by an = or a & character; if preceded by ! we invert the result. | |
2868 | */ | |
2869 | ||
2870 | iplist = Ustrchr(domain, '='); | |
2871 | if (iplist == NULL) | |
2872 | { | |
2873 | bitmask = TRUE; | |
2874 | iplist = Ustrchr(domain, '&'); | |
2875 | } | |
2876 | ||
2877 | if (iplist != NULL) | |
2878 | { | |
2879 | if (iplist > domain && iplist[-1] == '!') | |
2880 | { | |
2881 | invert_result = TRUE; | |
2882 | iplist[-1] = 0; | |
2883 | } | |
2884 | *iplist++ = 0; | |
2885 | } | |
2886 | ||
d6f6e0dc PH |
2887 | /* If there is a comma in the domain, it indicates that a second domain for |
2888 | looking up TXT records is provided, before the main domain. Otherwise we must | |
2889 | set domain_txt == domain. */ | |
2890 | ||
2891 | domain_txt = domain; | |
2892 | comma = Ustrchr(domain, ','); | |
2893 | if (comma != NULL) | |
2894 | { | |
2895 | *comma++ = 0; | |
2896 | domain = comma; | |
2897 | } | |
2898 | ||
059ec3d9 PH |
2899 | /* Check that what we have left is a sensible domain name. There is no reason |
2900 | why these domains should in fact use the same syntax as hosts and email | |
2901 | domains, but in practice they seem to. However, there is little point in | |
2902 | actually causing an error here, because that would no doubt hold up incoming | |
2903 | mail. Instead, I'll just log it. */ | |
2904 | ||
2905 | for (s = domain; *s != 0; s++) | |
2906 | { | |
2907 | if (!isalnum(*s) && *s != '-' && *s != '.') | |
2908 | { | |
2909 | log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains " | |
2910 | "strange characters - is this right?", domain); | |
2911 | break; | |
2912 | } | |
2913 | } | |
2914 | ||
d6f6e0dc PH |
2915 | /* Check the alternate domain if present */ |
2916 | ||
2917 | if (domain_txt != domain) for (s = domain_txt; *s != 0; s++) | |
2918 | { | |
2919 | if (!isalnum(*s) && *s != '-' && *s != '.') | |
2920 | { | |
2921 | log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains " | |
2922 | "strange characters - is this right?", domain_txt); | |
2923 | break; | |
2924 | } | |
2925 | } | |
2926 | ||
8e669ac1 | 2927 | /* If there is no key string, construct the query by adding the domain name |
0bcb2a0e | 2928 | onto the inverted host address, and perform a single DNS lookup. */ |
8e669ac1 | 2929 | |
059ec3d9 PH |
2930 | if (key == NULL) |
2931 | { | |
2932 | if (sender_host_address == NULL) return FAIL; /* can never match */ | |
2933 | if (revadd[0] == 0) invert_address(revadd, sender_host_address); | |
d6f6e0dc PH |
2934 | rc = one_check_dnsbl(domain, domain_txt, sender_host_address, revadd, |
2935 | iplist, bitmask, invert_result, defer_return); | |
0bcb2a0e PH |
2936 | if (rc == OK) |
2937 | { | |
d6f6e0dc | 2938 | dnslist_domain = string_copy(domain_txt); |
8e669ac1 | 2939 | HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n", |
d6f6e0dc | 2940 | sender_host_address, dnslist_domain); |
0bcb2a0e | 2941 | } |
0bcb2a0e | 2942 | if (rc != FAIL) return rc; /* OK or DEFER */ |
059ec3d9 | 2943 | } |
8e669ac1 PH |
2944 | |
2945 | /* If there is a key string, it can be a list of domains or IP addresses to | |
0bcb2a0e | 2946 | be concatenated with the main domain. */ |
8e669ac1 | 2947 | |
059ec3d9 PH |
2948 | else |
2949 | { | |
0bcb2a0e | 2950 | int keysep = 0; |
8e669ac1 PH |
2951 | BOOL defer = FALSE; |
2952 | uschar *keydomain; | |
0bcb2a0e | 2953 | uschar keybuffer[256]; |
d6f6e0dc | 2954 | uschar keyrevadd[128]; |
8e669ac1 PH |
2955 | |
2956 | while ((keydomain = string_nextinlist(&key, &keysep, keybuffer, | |
0bcb2a0e | 2957 | sizeof(keybuffer))) != NULL) |
8e669ac1 | 2958 | { |
d6f6e0dc PH |
2959 | uschar *prepend = keydomain; |
2960 | ||
7e66e54d | 2961 | if (string_is_ip_address(keydomain, NULL) != 0) |
059ec3d9 | 2962 | { |
0bcb2a0e | 2963 | invert_address(keyrevadd, keydomain); |
d6f6e0dc | 2964 | prepend = keyrevadd; |
059ec3d9 | 2965 | } |
8e669ac1 | 2966 | |
d6f6e0dc PH |
2967 | rc = one_check_dnsbl(domain, domain_txt, keydomain, prepend, iplist, |
2968 | bitmask, invert_result, defer_return); | |
8e669ac1 | 2969 | |
0bcb2a0e | 2970 | if (rc == OK) |
059ec3d9 | 2971 | { |
d6f6e0dc | 2972 | dnslist_domain = string_copy(domain_txt); |
8e669ac1 | 2973 | HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n", |
d6f6e0dc | 2974 | keydomain, dnslist_domain); |
8e669ac1 | 2975 | return OK; |
059ec3d9 | 2976 | } |
8e669ac1 | 2977 | |
c38d6da9 PH |
2978 | /* If the lookup deferred, remember this fact. We keep trying the rest |
2979 | of the list to see if we get a useful result, and if we don't, we return | |
2980 | DEFER at the end. */ | |
059ec3d9 | 2981 | |
c38d6da9 | 2982 | if (rc == DEFER) defer = TRUE; |
0bcb2a0e | 2983 | } /* continue with next keystring domain/address */ |
c38d6da9 PH |
2984 | |
2985 | if (defer) return DEFER; | |
8e669ac1 | 2986 | } |
0bcb2a0e | 2987 | } /* continue with next dnsdb outer domain */ |
059ec3d9 PH |
2988 | |
2989 | return FAIL; | |
2990 | } | |
2991 | ||
2992 | /* End of verify.c */ |