Commit | Line | Data |
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059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
d4e5e70b | 5 | /* Copyright (c) University of Cambridge 1995 - 2017 */ |
059ec3d9 PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | /* Functions concerned with verifying things. The original code for callout | |
9 | caching was contributed by Kevin Fleming (but I hacked it around a bit). */ | |
10 | ||
11 | ||
12 | #include "exim.h" | |
817d9f57 | 13 | #include "transports/smtp.h" |
059ec3d9 | 14 | |
e4bdf652 JH |
15 | #define CUTTHROUGH_CMD_TIMEOUT 30 /* timeout for cutthrough-routing calls */ |
16 | #define CUTTHROUGH_DATA_TIMEOUT 60 /* timeout for cutthrough-routing calls */ | |
817d9f57 JH |
17 | static smtp_outblock ctblock; |
18 | uschar ctbuffer[8192]; | |
19 | ||
059ec3d9 PH |
20 | |
21 | /* Structure for caching DNSBL lookups */ | |
22 | ||
23 | typedef struct dnsbl_cache_block { | |
14b3c5bc | 24 | time_t expiry; |
059ec3d9 PH |
25 | dns_address *rhs; |
26 | uschar *text; | |
27 | int rc; | |
28 | BOOL text_set; | |
29 | } dnsbl_cache_block; | |
30 | ||
31 | ||
32 | /* Anchor for DNSBL cache */ | |
33 | ||
34 | static tree_node *dnsbl_cache = NULL; | |
35 | ||
36 | ||
431b7361 PH |
37 | /* Bits for match_type in one_check_dnsbl() */ |
38 | ||
39 | #define MT_NOT 1 | |
40 | #define MT_ALL 2 | |
41 | ||
57cc2785 | 42 | static uschar cutthrough_response(int, char, uschar **, int); |
431b7361 | 43 | |
8d330698 | 44 | |
059ec3d9 PH |
45 | |
46 | /************************************************* | |
47 | * Retrieve a callout cache record * | |
48 | *************************************************/ | |
49 | ||
50 | /* If a record exists, check whether it has expired. | |
51 | ||
52 | Arguments: | |
53 | dbm_file an open hints file | |
54 | key the record key | |
55 | type "address" or "domain" | |
56 | positive_expire expire time for positive records | |
57 | negative_expire expire time for negative records | |
58 | ||
59 | Returns: the cache record if a non-expired one exists, else NULL | |
60 | */ | |
61 | ||
62 | static dbdata_callout_cache * | |
55414b25 | 63 | get_callout_cache_record(open_db *dbm_file, const uschar *key, uschar *type, |
059ec3d9 PH |
64 | int positive_expire, int negative_expire) |
65 | { | |
66 | BOOL negative; | |
67 | int length, expire; | |
68 | time_t now; | |
69 | dbdata_callout_cache *cache_record; | |
70 | ||
71 | cache_record = dbfn_read_with_length(dbm_file, key, &length); | |
72 | ||
73 | if (cache_record == NULL) | |
74 | { | |
6f4d5ad3 | 75 | HDEBUG(D_verify) debug_printf("callout cache: no %s record found for %s\n", type, key); |
059ec3d9 PH |
76 | return NULL; |
77 | } | |
78 | ||
79 | /* We treat a record as "negative" if its result field is not positive, or if | |
80 | it is a domain record and the postmaster field is negative. */ | |
81 | ||
82 | negative = cache_record->result != ccache_accept || | |
83 | (type[0] == 'd' && cache_record->postmaster_result == ccache_reject); | |
84 | expire = negative? negative_expire : positive_expire; | |
85 | now = time(NULL); | |
86 | ||
87 | if (now - cache_record->time_stamp > expire) | |
88 | { | |
6f4d5ad3 | 89 | HDEBUG(D_verify) debug_printf("callout cache: %s record expired for %s\n", type, key); |
059ec3d9 PH |
90 | return NULL; |
91 | } | |
92 | ||
93 | /* If this is a non-reject domain record, check for the obsolete format version | |
94 | that doesn't have the postmaster and random timestamps, by looking at the | |
95 | length. If so, copy it to a new-style block, replicating the record's | |
96 | timestamp. Then check the additional timestamps. (There's no point wasting | |
97 | effort if connections are rejected.) */ | |
98 | ||
99 | if (type[0] == 'd' && cache_record->result != ccache_reject) | |
100 | { | |
101 | if (length == sizeof(dbdata_callout_cache_obs)) | |
102 | { | |
103 | dbdata_callout_cache *new = store_get(sizeof(dbdata_callout_cache)); | |
104 | memcpy(new, cache_record, length); | |
105 | new->postmaster_stamp = new->random_stamp = new->time_stamp; | |
106 | cache_record = new; | |
107 | } | |
108 | ||
109 | if (now - cache_record->postmaster_stamp > expire) | |
110 | cache_record->postmaster_result = ccache_unknown; | |
111 | ||
112 | if (now - cache_record->random_stamp > expire) | |
113 | cache_record->random_result = ccache_unknown; | |
114 | } | |
115 | ||
6f4d5ad3 | 116 | HDEBUG(D_verify) debug_printf("callout cache: found %s record for %s\n", type, key); |
059ec3d9 PH |
117 | return cache_record; |
118 | } | |
119 | ||
120 | ||
121 | ||
707ee5b1 JH |
122 | /* Check the callout cache. |
123 | Options * pm_mailfrom may be modified by cache partial results. | |
059ec3d9 | 124 | |
707ee5b1 | 125 | Return: TRUE if result found |
059ec3d9 PH |
126 | */ |
127 | ||
707ee5b1 JH |
128 | static BOOL |
129 | cached_callout_lookup(address_item * addr, uschar * address_key, | |
130 | uschar * from_address, int * opt_ptr, uschar ** pm_ptr, | |
131 | int * yield, uschar ** failure_ptr, | |
132 | dbdata_callout_cache * new_domain_record, int * old_domain_res) | |
059ec3d9 | 133 | { |
707ee5b1 | 134 | int options = *opt_ptr; |
059ec3d9 PH |
135 | open_db dbblock; |
136 | open_db *dbm_file = NULL; | |
059ec3d9 PH |
137 | |
138 | /* Open the callout cache database, it it exists, for reading only at this | |
139 | stage, unless caching has been disabled. */ | |
140 | ||
8b9476ba | 141 | if (options & vopt_callout_no_cache) |
059ec3d9 PH |
142 | { |
143 | HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n"); | |
144 | } | |
707ee5b1 | 145 | else if (!(dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE))) |
059ec3d9 PH |
146 | { |
147 | HDEBUG(D_verify) debug_printf("callout cache: not available\n"); | |
148 | } | |
707ee5b1 | 149 | else |
059ec3d9 | 150 | { |
707ee5b1 JH |
151 | /* If a cache database is available see if we can avoid the need to do an |
152 | actual callout by making use of previously-obtained data. */ | |
153 | ||
154 | dbdata_callout_cache_address * cache_address_record; | |
155 | dbdata_callout_cache * cache_record = get_callout_cache_record(dbm_file, | |
156 | addr->domain, US"domain", | |
157 | callout_cache_domain_positive_expire, callout_cache_domain_negative_expire); | |
059ec3d9 PH |
158 | |
159 | /* If an unexpired cache record was found for this domain, see if the callout | |
160 | process can be short-circuited. */ | |
161 | ||
ff5929e3 | 162 | if (cache_record) |
059ec3d9 | 163 | { |
2b1c6e3a PH |
164 | /* In most cases, if an early command (up to and including MAIL FROM:<>) |
165 | was rejected, there is no point carrying on. The callout fails. However, if | |
166 | we are doing a recipient verification with use_sender or use_postmaster | |
167 | set, a previous failure of MAIL FROM:<> doesn't count, because this time we | |
168 | will be using a non-empty sender. We have to remember this situation so as | |
169 | not to disturb the cached domain value if this whole verification succeeds | |
170 | (we don't want it turning into "accept"). */ | |
171 | ||
707ee5b1 | 172 | *old_domain_res = cache_record->result; |
2b1c6e3a | 173 | |
707ee5b1 JH |
174 | if ( cache_record->result == ccache_reject |
175 | || *from_address == 0 && cache_record->result == ccache_reject_mfnull) | |
059ec3d9 PH |
176 | { |
177 | setflag(addr, af_verify_nsfail); | |
178 | HDEBUG(D_verify) | |
707ee5b1 JH |
179 | debug_printf("callout cache: domain gave initial rejection, or " |
180 | "does not accept HELO or MAIL FROM:<>\n"); | |
059ec3d9 PH |
181 | setflag(addr, af_verify_nsfail); |
182 | addr->user_message = US"(result of an earlier callout reused)."; | |
707ee5b1 | 183 | *yield = FAIL; |
8e669ac1 | 184 | *failure_ptr = US"mail"; |
707ee5b1 JH |
185 | dbfn_close(dbm_file); |
186 | return TRUE; | |
059ec3d9 PH |
187 | } |
188 | ||
189 | /* If a previous check on a "random" local part was accepted, we assume | |
190 | that the server does not do any checking on local parts. There is therefore | |
191 | no point in doing the callout, because it will always be successful. If a | |
192 | random check previously failed, arrange not to do it again, but preserve | |
193 | the data in the new record. If a random check is required but hasn't been | |
194 | done, skip the remaining cache processing. */ | |
195 | ||
8b9476ba | 196 | if (options & vopt_callout_random) switch(cache_record->random_result) |
059ec3d9 PH |
197 | { |
198 | case ccache_accept: | |
8b9476ba JH |
199 | HDEBUG(D_verify) |
200 | debug_printf("callout cache: domain accepts random addresses\n"); | |
707ee5b1 JH |
201 | dbfn_close(dbm_file); |
202 | return TRUE; /* Default yield is OK */ | |
059ec3d9 PH |
203 | |
204 | case ccache_reject: | |
8b9476ba JH |
205 | HDEBUG(D_verify) |
206 | debug_printf("callout cache: domain rejects random addresses\n"); | |
707ee5b1 JH |
207 | *opt_ptr = options & ~vopt_callout_random; |
208 | new_domain_record->random_result = ccache_reject; | |
209 | new_domain_record->random_stamp = cache_record->random_stamp; | |
8b9476ba | 210 | break; |
059ec3d9 PH |
211 | |
212 | default: | |
8b9476ba JH |
213 | HDEBUG(D_verify) |
214 | debug_printf("callout cache: need to check random address handling " | |
215 | "(not cached or cache expired)\n"); | |
707ee5b1 JH |
216 | dbfn_close(dbm_file); |
217 | return FALSE; | |
059ec3d9 PH |
218 | } |
219 | ||
220 | /* If a postmaster check is requested, but there was a previous failure, | |
221 | there is again no point in carrying on. If a postmaster check is required, | |
222 | but has not been done before, we are going to have to do a callout, so skip | |
223 | remaining cache processing. */ | |
224 | ||
707ee5b1 | 225 | if (*pm_ptr) |
059ec3d9 PH |
226 | { |
227 | if (cache_record->postmaster_result == ccache_reject) | |
707ee5b1 JH |
228 | { |
229 | setflag(addr, af_verify_pmfail); | |
230 | HDEBUG(D_verify) | |
231 | debug_printf("callout cache: domain does not accept " | |
232 | "RCPT TO:<postmaster@domain>\n"); | |
233 | *yield = FAIL; | |
234 | *failure_ptr = US"postmaster"; | |
235 | setflag(addr, af_verify_pmfail); | |
236 | addr->user_message = US"(result of earlier verification reused)."; | |
237 | dbfn_close(dbm_file); | |
238 | return TRUE; | |
239 | } | |
059ec3d9 | 240 | if (cache_record->postmaster_result == ccache_unknown) |
707ee5b1 JH |
241 | { |
242 | HDEBUG(D_verify) | |
243 | debug_printf("callout cache: need to check RCPT " | |
244 | "TO:<postmaster@domain> (not cached or cache expired)\n"); | |
245 | dbfn_close(dbm_file); | |
246 | return FALSE; | |
247 | } | |
059ec3d9 PH |
248 | |
249 | /* If cache says OK, set pm_mailfrom NULL to prevent a redundant | |
250 | postmaster check if the address itself has to be checked. Also ensure | |
251 | that the value in the cache record is preserved (with its old timestamp). | |
252 | */ | |
253 | ||
254 | HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT " | |
707ee5b1 JH |
255 | "TO:<postmaster@domain>\n"); |
256 | *pm_ptr = NULL; | |
257 | new_domain_record->postmaster_result = ccache_accept; | |
258 | new_domain_record->postmaster_stamp = cache_record->postmaster_stamp; | |
059ec3d9 PH |
259 | } |
260 | } | |
261 | ||
262 | /* We can't give a result based on information about the domain. See if there | |
263 | is an unexpired cache record for this specific address (combined with the | |
264 | sender address if we are doing a recipient callout with a non-empty sender). | |
265 | */ | |
266 | ||
707ee5b1 JH |
267 | if (!(cache_address_record = (dbdata_callout_cache_address *) |
268 | get_callout_cache_record(dbm_file, address_key, US"address", | |
269 | callout_cache_positive_expire, callout_cache_negative_expire))) | |
270 | { | |
271 | dbfn_close(dbm_file); | |
272 | return FALSE; | |
273 | } | |
059ec3d9 | 274 | |
707ee5b1 | 275 | if (cache_address_record->result == ccache_accept) |
059ec3d9 | 276 | { |
707ee5b1 JH |
277 | HDEBUG(D_verify) |
278 | debug_printf("callout cache: address record is positive\n"); | |
279 | } | |
280 | else | |
281 | { | |
282 | HDEBUG(D_verify) | |
283 | debug_printf("callout cache: address record is negative\n"); | |
284 | addr->user_message = US"Previous (cached) callout verification failure"; | |
285 | *failure_ptr = US"recipient"; | |
286 | *yield = FAIL; | |
059ec3d9 PH |
287 | } |
288 | ||
289 | /* Close the cache database while we actually do the callout for real. */ | |
290 | ||
059ec3d9 | 291 | dbfn_close(dbm_file); |
707ee5b1 JH |
292 | return TRUE; |
293 | } | |
294 | return FALSE; | |
295 | } | |
296 | ||
297 | ||
298 | /* Write results to callout cache | |
299 | */ | |
300 | static void | |
301 | cache_callout_write(dbdata_callout_cache * dom_rec, const uschar * domain, | |
302 | int done, dbdata_callout_cache_address * addr_rec, uschar * address_key) | |
303 | { | |
304 | open_db dbblock; | |
305 | open_db *dbm_file = NULL; | |
306 | ||
307 | /* If we get here with done == TRUE, a successful callout happened, and yield | |
308 | will be set OK or FAIL according to the response to the RCPT command. | |
309 | Otherwise, we looped through the hosts but couldn't complete the business. | |
310 | However, there may be domain-specific information to cache in both cases. | |
311 | ||
312 | The value of the result field in the new_domain record is ccache_unknown if | |
313 | there was an error before or with MAIL FROM:, and errno was not zero, | |
314 | implying some kind of I/O error. We don't want to write the cache in that case. | |
315 | Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */ | |
316 | ||
317 | if (dom_rec->result != ccache_unknown) | |
318 | if (!(dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE))) | |
319 | { | |
320 | HDEBUG(D_verify) debug_printf("callout cache: not available\n"); | |
321 | } | |
322 | else | |
323 | { | |
324 | (void)dbfn_write(dbm_file, domain, dom_rec, | |
325 | (int)sizeof(dbdata_callout_cache)); | |
326 | HDEBUG(D_verify) debug_printf("wrote callout cache domain record for %s:\n" | |
327 | " result=%d postmaster=%d random=%d\n", | |
328 | domain, | |
329 | dom_rec->result, | |
330 | dom_rec->postmaster_result, | |
331 | dom_rec->random_result); | |
332 | } | |
333 | ||
334 | /* If a definite result was obtained for the callout, cache it unless caching | |
335 | is disabled. */ | |
336 | ||
337 | if (done && addr_rec->result != ccache_unknown) | |
338 | { | |
339 | if (!dbm_file) | |
340 | dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE); | |
341 | if (!dbm_file) | |
342 | { | |
343 | HDEBUG(D_verify) debug_printf("no callout cache available\n"); | |
344 | } | |
345 | else | |
346 | { | |
347 | (void)dbfn_write(dbm_file, address_key, addr_rec, | |
348 | (int)sizeof(dbdata_callout_cache_address)); | |
349 | HDEBUG(D_verify) debug_printf("wrote %s callout cache address record for %s\n", | |
350 | addr_rec->result == ccache_accept ? "positive" : "negative", | |
351 | address_key); | |
352 | } | |
353 | } | |
354 | ||
355 | if (dbm_file) dbfn_close(dbm_file); | |
356 | } | |
357 | ||
358 | ||
c4c940fd JH |
359 | /* Cutthrough-multi. If the existing cached cutthrough connection matches |
360 | the one we would make for a subsequent recipient, use it. Send the RCPT TO | |
361 | and check the result, nonpipelined as it may be wanted immediately for | |
362 | recipient-verification. | |
363 | ||
364 | It seems simpler to deal with this case separately from the main callout loop. | |
365 | We will need to remember it has sent, or not, so that rcpt-acl tail code | |
366 | can do it there for the non-rcpt-verify case. For this we keep an addresscount. | |
367 | ||
368 | Return: TRUE for a definitive result for the recipient | |
369 | */ | |
370 | static int | |
371 | cutthrough_multi(address_item * addr, host_item * host_list, | |
372 | transport_feedback * tf, int * yield) | |
373 | { | |
374 | BOOL done = FALSE; | |
375 | host_item * host; | |
376 | ||
377 | if (addr->transport == cutthrough.addr.transport) | |
378 | for (host = host_list; host; host = host->next) | |
379 | if (Ustrcmp(host->address, cutthrough.host.address) == 0) | |
380 | { | |
381 | int host_af; | |
382 | uschar *interface = NULL; /* Outgoing interface to use; NULL => any */ | |
383 | int port = 25; | |
384 | ||
385 | deliver_host = host->name; | |
386 | deliver_host_address = host->address; | |
387 | deliver_host_port = host->port; | |
388 | deliver_domain = addr->domain; | |
389 | transport_name = addr->transport->name; | |
390 | ||
57cc2785 | 391 | host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET; |
c4c940fd JH |
392 | |
393 | if (!smtp_get_interface(tf->interface, host_af, addr, &interface, | |
394 | US"callout") || | |
395 | !smtp_get_port(tf->port, addr, &port, US"callout")) | |
396 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address, | |
397 | addr->message); | |
398 | ||
399 | if ( ( interface == cutthrough.interface | |
400 | || ( interface | |
401 | && cutthrough.interface | |
402 | && Ustrcmp(interface, cutthrough.interface) == 0 | |
403 | ) ) | |
404 | && port == cutthrough.host.port | |
405 | ) | |
406 | { | |
407 | uschar * resp = NULL; | |
408 | ||
409 | /* Match! Send the RCPT TO, set done from the response */ | |
410 | done = | |
411 | smtp_write_command(&ctblock, FALSE, "RCPT TO:<%.1000s>\r\n", | |
412 | transport_rcpt_address(addr, | |
413 | addr->transport->rcpt_include_affixes)) >= 0 && | |
57cc2785 | 414 | cutthrough_response(cutthrough.fd, '2', &resp, CUTTHROUGH_DATA_TIMEOUT) == '2'; |
c4c940fd JH |
415 | |
416 | /* This would go horribly wrong if a callout fail was ignored by ACL. | |
417 | We punt by abandoning cutthrough on a reject, like the | |
418 | first-rcpt does. */ | |
419 | ||
420 | if (done) | |
421 | { | |
422 | address_item * na = store_get(sizeof(address_item)); | |
423 | *na = cutthrough.addr; | |
424 | cutthrough.addr = *addr; | |
425 | cutthrough.addr.host_used = &cutthrough.host; | |
426 | cutthrough.addr.next = na; | |
427 | ||
428 | cutthrough.nrcpt++; | |
429 | } | |
430 | else | |
431 | { | |
57cc2785 | 432 | cancel_cutthrough_connection(TRUE, US"recipient rejected"); |
c4c940fd JH |
433 | if (!resp || errno == ETIMEDOUT) |
434 | { | |
435 | HDEBUG(D_verify) debug_printf("SMTP timeout\n"); | |
436 | } | |
437 | else if (errno == 0) | |
438 | { | |
439 | if (*resp == 0) | |
440 | Ustrcpy(resp, US"connection dropped"); | |
441 | ||
442 | addr->message = | |
e9166683 JH |
443 | string_sprintf("response to \"%s\" was: %s", |
444 | big_buffer, string_printing(resp)); | |
c4c940fd JH |
445 | |
446 | addr->user_message = | |
447 | string_sprintf("Callout verification failed:\n%s", resp); | |
448 | ||
449 | /* Hard rejection ends the process */ | |
450 | ||
451 | if (resp[0] == '5') /* Address rejected */ | |
452 | { | |
453 | *yield = FAIL; | |
454 | done = TRUE; | |
455 | } | |
456 | } | |
457 | } | |
458 | } | |
459 | break; /* host_list */ | |
460 | } | |
461 | if (!done) | |
57cc2785 | 462 | cancel_cutthrough_connection(TRUE, US"incompatible connection"); |
c4c940fd JH |
463 | return done; |
464 | } | |
465 | ||
466 | ||
707ee5b1 JH |
467 | /************************************************* |
468 | * Do callout verification for an address * | |
469 | *************************************************/ | |
470 | ||
471 | /* This function is called from verify_address() when the address has routed to | |
472 | a host list, and a callout has been requested. Callouts are expensive; that is | |
473 | why a cache is used to improve the efficiency. | |
474 | ||
475 | Arguments: | |
476 | addr the address that's been routed | |
477 | host_list the list of hosts to try | |
478 | tf the transport feedback block | |
479 | ||
480 | ifstring "interface" option from transport, or NULL | |
481 | portstring "port" option from transport, or NULL | |
482 | protocolstring "protocol" option from transport, or NULL | |
483 | callout the per-command callout timeout | |
484 | callout_overall the overall callout timeout (if < 0 use 4*callout) | |
485 | callout_connect the callout connection timeout (if < 0 use callout) | |
486 | options the verification options - these bits are used: | |
487 | vopt_is_recipient => this is a recipient address | |
488 | vopt_callout_no_cache => don't use callout cache | |
489 | vopt_callout_fullpm => if postmaster check, do full one | |
490 | vopt_callout_random => do the "random" thing | |
491 | vopt_callout_recipsender => use real sender for recipient | |
492 | vopt_callout_recippmaster => use postmaster for recipient | |
57cc2785 | 493 | vopt_callout_hold => lazy close connection |
707ee5b1 JH |
494 | se_mailfrom MAIL FROM address for sender verify; NULL => "" |
495 | pm_mailfrom if non-NULL, do the postmaster check with this sender | |
496 | ||
497 | Returns: OK/FAIL/DEFER | |
498 | */ | |
499 | ||
500 | static int | |
501 | do_callout(address_item *addr, host_item *host_list, transport_feedback *tf, | |
502 | int callout, int callout_overall, int callout_connect, int options, | |
503 | uschar *se_mailfrom, uschar *pm_mailfrom) | |
504 | { | |
505 | int yield = OK; | |
506 | int old_domain_cache_result = ccache_accept; | |
507 | BOOL done = FALSE; | |
508 | uschar *address_key; | |
509 | uschar *from_address; | |
510 | uschar *random_local_part = NULL; | |
511 | const uschar *save_deliver_domain = deliver_domain; | |
512 | uschar **failure_ptr = options & vopt_is_recipient | |
513 | ? &recipient_verify_failure : &sender_verify_failure; | |
514 | dbdata_callout_cache new_domain_record; | |
515 | dbdata_callout_cache_address new_address_record; | |
707ee5b1 JH |
516 | time_t callout_start_time; |
517 | ||
518 | new_domain_record.result = ccache_unknown; | |
519 | new_domain_record.postmaster_result = ccache_unknown; | |
520 | new_domain_record.random_result = ccache_unknown; | |
521 | ||
522 | memset(&new_address_record, 0, sizeof(new_address_record)); | |
523 | ||
524 | /* For a recipient callout, the key used for the address cache record must | |
525 | include the sender address if we are using the real sender in the callout, | |
526 | because that may influence the result of the callout. */ | |
527 | ||
528 | if (options & vopt_is_recipient) | |
529 | if (options & vopt_callout_recipsender) | |
530 | { | |
531 | from_address = sender_address; | |
532 | address_key = string_sprintf("%s/<%s>", addr->address, sender_address); | |
533 | if (cutthrough.delivery) options |= vopt_callout_no_cache; | |
534 | } | |
535 | else if (options & vopt_callout_recippmaster) | |
536 | { | |
537 | from_address = string_sprintf("postmaster@%s", qualify_domain_sender); | |
538 | address_key = string_sprintf("%s/<postmaster@%s>", addr->address, | |
539 | qualify_domain_sender); | |
540 | } | |
541 | else | |
542 | { | |
543 | from_address = US""; | |
544 | address_key = addr->address; | |
545 | } | |
546 | ||
547 | /* For a sender callout, we must adjust the key if the mailfrom address is not | |
548 | empty. */ | |
549 | ||
550 | else | |
551 | { | |
552 | from_address = se_mailfrom ? se_mailfrom : US""; | |
553 | address_key = *from_address | |
554 | ? string_sprintf("%s/<%s>", addr->address, from_address) : addr->address; | |
059ec3d9 PH |
555 | } |
556 | ||
707ee5b1 JH |
557 | if (cached_callout_lookup(addr, address_key, from_address, |
558 | &options, &pm_mailfrom, &yield, failure_ptr, | |
559 | &new_domain_record, &old_domain_cache_result)) | |
57cc2785 JH |
560 | { |
561 | cancel_cutthrough_connection(TRUE, US"cache-hit"); | |
707ee5b1 | 562 | goto END_CALLOUT; |
57cc2785 | 563 | } |
707ee5b1 | 564 | |
193e3acd | 565 | if (!addr->transport) |
059ec3d9 | 566 | { |
193e3acd | 567 | HDEBUG(D_verify) debug_printf("cannot callout via null transport\n"); |
059ec3d9 | 568 | } |
6681531a HSHR |
569 | else if (Ustrcmp(addr->transport->driver_name, "smtp") != 0) |
570 | log_write(0, LOG_MAIN|LOG_PANIC|LOG_CONFIG_FOR, "callout transport '%s': %s is non-smtp", | |
571 | addr->transport->name, addr->transport->driver_name); | |
193e3acd JH |
572 | else |
573 | { | |
574 | smtp_transport_options_block *ob = | |
9d9c3746 | 575 | (smtp_transport_options_block *)addr->transport->options_block; |
c4c940fd | 576 | host_item * host; |
059ec3d9 | 577 | |
193e3acd JH |
578 | /* The information wasn't available in the cache, so we have to do a real |
579 | callout and save the result in the cache for next time, unless no_cache is set, | |
580 | or unless we have a previously cached negative random result. If we are to test | |
581 | with a random local part, ensure that such a local part is available. If not, | |
4c04137d | 582 | log the fact, but carry on without randomising. */ |
059ec3d9 | 583 | |
707ee5b1 | 584 | if (options & vopt_callout_random && callout_random_local_part) |
65f1c92a | 585 | if (!(random_local_part = expand_string(callout_random_local_part))) |
193e3acd JH |
586 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand " |
587 | "callout_random_local_part: %s", expand_string_message); | |
059ec3d9 | 588 | |
193e3acd JH |
589 | /* Default the connect and overall callout timeouts if not set, and record the |
590 | time we are starting so that we can enforce it. */ | |
4c590bd1 | 591 | |
193e3acd JH |
592 | if (callout_overall < 0) callout_overall = 4 * callout; |
593 | if (callout_connect < 0) callout_connect = callout; | |
594 | callout_start_time = time(NULL); | |
4c590bd1 | 595 | |
193e3acd JH |
596 | /* Before doing a real callout, if this is an SMTP connection, flush the SMTP |
597 | output because a callout might take some time. When PIPELINING is active and | |
598 | there are many recipients, the total time for doing lots of callouts can add up | |
599 | and cause the client to time out. So in this case we forgo the PIPELINING | |
600 | optimization. */ | |
817d9f57 | 601 | |
ff5929e3 | 602 | if (smtp_out && !disable_callout_flush) mac_smtp_fflush(); |
059ec3d9 | 603 | |
c4c940fd JH |
604 | clearflag(addr, af_verify_pmfail); /* postmaster callout flag */ |
605 | clearflag(addr, af_verify_nsfail); /* null sender callout flag */ | |
606 | ||
5032d1cf JH |
607 | /* cutthrough-multi: if a nonfirst rcpt has the same routing as the first, |
608 | and we are holding a cutthrough conn open, we can just append the rcpt to | |
609 | that conn for verification purposes (and later delivery also). Simplest | |
c4c940fd | 610 | coding means skipping this whole loop and doing the append separately. */ |
5032d1cf JH |
611 | |
612 | /* Can we re-use an open cutthrough connection? */ | |
613 | if ( cutthrough.fd >= 0 | |
614 | && (options & (vopt_callout_recipsender | vopt_callout_recippmaster)) | |
615 | == vopt_callout_recipsender | |
616 | && !random_local_part | |
617 | && !pm_mailfrom | |
618 | ) | |
c4c940fd | 619 | done = cutthrough_multi(addr, host_list, tf, &yield); |
5032d1cf | 620 | |
c4c940fd JH |
621 | /* If we did not use a cached connection, make connections to the hosts |
622 | and do real callouts. The list of hosts is passed in as an argument. */ | |
059ec3d9 | 623 | |
ff5929e3 | 624 | for (host = host_list; host && !done; host = host->next) |
059ec3d9 | 625 | { |
193e3acd JH |
626 | int host_af; |
627 | int port = 25; | |
193e3acd | 628 | uschar *interface = NULL; /* Outgoing interface to use; NULL => any */ |
02b41d71 | 629 | smtp_context sx; |
193e3acd | 630 | |
ff5929e3 | 631 | if (!host->address) |
193e3acd JH |
632 | { |
633 | DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n", | |
634 | host->name); | |
635 | continue; | |
636 | } | |
059ec3d9 | 637 | |
193e3acd | 638 | /* Check the overall callout timeout */ |
059ec3d9 | 639 | |
193e3acd JH |
640 | if (time(NULL) - callout_start_time >= callout_overall) |
641 | { | |
642 | HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n"); | |
643 | break; | |
644 | } | |
059ec3d9 | 645 | |
193e3acd | 646 | /* Set IPv4 or IPv6 */ |
059ec3d9 | 647 | |
e9166683 | 648 | host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET; |
de3a88fb | 649 | |
193e3acd JH |
650 | /* Expand and interpret the interface and port strings. The latter will not |
651 | be used if there is a host-specific port (e.g. from a manualroute router). | |
652 | This has to be delayed till now, because they may expand differently for | |
653 | different hosts. If there's a failure, log it, but carry on with the | |
654 | defaults. */ | |
de3a88fb | 655 | |
193e3acd JH |
656 | deliver_host = host->name; |
657 | deliver_host_address = host->address; | |
a7538db1 | 658 | deliver_host_port = host->port; |
193e3acd | 659 | deliver_domain = addr->domain; |
aec45841 | 660 | transport_name = addr->transport->name; |
059ec3d9 | 661 | |
6f6dedcc | 662 | if ( !smtp_get_interface(tf->interface, host_af, addr, &interface, |
bf7aabb4 JH |
663 | US"callout") |
664 | || !smtp_get_port(tf->port, addr, &port, US"callout") | |
665 | ) | |
193e3acd JH |
666 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address, |
667 | addr->message); | |
059ec3d9 | 668 | |
02b41d71 JH |
669 | sx.addrlist = addr; |
670 | sx.host = host; | |
671 | sx.host_af = host_af, | |
672 | sx.port = port; | |
673 | sx.interface = interface; | |
674 | sx.helo_data = tf->helo_data; | |
675 | sx.tblock = addr->transport; | |
e9166683 | 676 | sx.verify = TRUE; |
02b41d71 JH |
677 | |
678 | tls_retry_connection: | |
679 | /* Set the address state so that errors are recorded in it */ | |
680 | ||
681 | addr->transport_return = PENDING_DEFER; | |
682 | ob->connect_timeout = callout_connect; | |
683 | ob->command_timeout = callout; | |
684 | ||
685 | /* Get the channel set up ready for a message (MAIL FROM being the next | |
686 | SMTP command to send. If we tried TLS but it failed, try again without | |
687 | if permitted */ | |
688 | ||
f10e3ea3 JH |
689 | yield = smtp_setup_conn(&sx, FALSE); |
690 | #ifdef SUPPORT_TLS | |
691 | if ( yield == DEFER | |
02b41d71 JH |
692 | && addr->basic_errno == ERRNO_TLSFAILURE |
693 | && ob->tls_tempfail_tryclear | |
694 | && verify_check_given_host(&ob->hosts_require_tls, host) != OK | |
695 | ) | |
193e3acd | 696 | { |
cf0c6164 JH |
697 | log_write(0, LOG_MAIN, |
698 | "%s: callout unencrypted to %s [%s] (not in hosts_require_tls)", | |
699 | addr->message, host->name, host->address); | |
e9166683 JH |
700 | addr->transport_return = PENDING_DEFER; |
701 | yield = smtp_setup_conn(&sx, TRUE); | |
02b41d71 | 702 | } |
f10e3ea3 | 703 | #endif |
02b41d71 JH |
704 | if (yield != OK) |
705 | { | |
02b41d71 | 706 | errno = addr->basic_errno; |
aec45841 | 707 | transport_name = NULL; |
193e3acd JH |
708 | deliver_host = deliver_host_address = NULL; |
709 | deliver_domain = save_deliver_domain; | |
bf7aabb4 | 710 | |
02b41d71 JH |
711 | /* Failure to accept HELO is cached; this blocks the whole domain for all |
712 | senders. I/O errors and defer responses are not cached. */ | |
770747fd | 713 | |
02b41d71 | 714 | if (yield == FAIL && (errno == 0 || errno == ERRNO_SMTPCLOSED)) |
a7538db1 | 715 | { |
02b41d71 JH |
716 | setflag(addr, af_verify_nsfail); |
717 | new_domain_record.result = ccache_reject; | |
718 | done = TRUE; | |
a7538db1 | 719 | } |
193e3acd | 720 | else |
02b41d71 JH |
721 | done = FALSE; |
722 | goto no_conn; | |
3c8b3577 | 723 | } |
9bfc60eb | 724 | |
02b41d71 JH |
725 | /* If we needed to authenticate, smtp_setup_conn() did that. Copy |
726 | the AUTH info for logging */ | |
fcc8e047 | 727 | |
02b41d71 JH |
728 | addr->authenticator = client_authenticator; |
729 | addr->auth_id = client_authenticated_id; | |
b4a2b536 | 730 | |
e9166683 JH |
731 | sx.from_addr = from_address; |
732 | sx.first_addr = sx.sync_addr = addr; | |
733 | sx.ok = FALSE; /*XXX these 3 last might not be needed for verify? */ | |
734 | sx.send_rset = TRUE; | |
735 | sx.completed_addr = FALSE; | |
b4a2b536 | 736 | |
cf0c6164 | 737 | new_domain_record.result = old_domain_cache_result == ccache_reject_mfnull |
e9166683 | 738 | ? ccache_reject_mfnull : ccache_accept; |
c4c940fd | 739 | |
e9166683 JH |
740 | /* Do the random local part check first. Temporarily replace the recipient |
741 | with the "random" value */ | |
02b41d71 | 742 | |
e9166683 | 743 | if (random_local_part) |
059ec3d9 | 744 | { |
e9166683 | 745 | uschar * main_address = addr->address; |
921dfc11 JH |
746 | const uschar * rcpt_domain = addr->domain; |
747 | ||
8c5d388a | 748 | #ifdef SUPPORT_I18N |
921dfc11 JH |
749 | uschar * errstr = NULL; |
750 | if ( testflag(addr, af_utf8_downcvt) | |
751 | && (rcpt_domain = string_domain_utf8_to_alabel(rcpt_domain, | |
752 | &errstr), errstr) | |
753 | ) | |
754 | { | |
755 | addr->message = errstr; | |
756 | errno = ERRNO_EXPANDFAIL; | |
757 | setflag(addr, af_verify_nsfail); | |
758 | done = FALSE; | |
759 | rcpt_domain = US""; /*XXX errorhandling! */ | |
760 | } | |
761 | #endif | |
762 | ||
57cc2785 JH |
763 | /* This would be ok for 1st rcpt of a cutthrough (the case handled here; |
764 | subsequents are done in cutthrough_multi()), but no way to | |
765 | handle a subsequent because of the RSET vaporising the MAIL FROM. | |
766 | So refuse to support any. Most cutthrough use will not involve | |
767 | random_local_part, so no loss. */ | |
768 | cancel_cutthrough_connection(TRUE, US"random-recipient"); | |
059ec3d9 | 769 | |
e9166683 JH |
770 | addr->address = string_sprintf("%s@%.1000s", |
771 | random_local_part, rcpt_domain); | |
772 | done = FALSE; | |
902fbd69 JH |
773 | |
774 | /* If accepted, we aren't going to do any further tests below. | |
775 | Otherwise, cache a real negative response, and get back to the right | |
776 | state to send RCPT. Unless there's some problem such as a dropped | |
777 | connection, we expect to succeed, because the commands succeeded above. | |
778 | However, some servers drop the connection after responding to an | |
779 | invalid recipient, so on (any) error we drop and remake the connection. | |
780 | XXX We don't care about that for postmaster_full. Should we? | |
781 | ||
782 | XXX could we add another flag to the context, and have the common | |
783 | code emit the RSET too? Even pipelined after the RCPT... | |
784 | Then the main-verify call could use it if there's to be a subsequent | |
785 | postmaster-verify. | |
786 | The sync_responses() would need to be taught about it and we'd | |
787 | need another return code filtering out to here. | |
788 | */ | |
789 | ||
a65c4156 JH |
790 | /* Remember when we last did a random test */ |
791 | new_domain_record.random_stamp = time(NULL); | |
792 | ||
e9166683 JH |
793 | if (smtp_write_mail_and_rcpt_cmds(&sx, &yield) == 0) |
794 | switch(addr->transport_return) | |
795 | { | |
796 | case PENDING_OK: | |
797 | new_domain_record.random_result = ccache_accept; | |
798 | break; | |
799 | case FAIL: | |
800 | new_domain_record.random_result = ccache_reject; | |
193e3acd | 801 | |
e9166683 | 802 | /* Between each check, issue RSET, because some servers accept only |
902fbd69 JH |
803 | one recipient after MAIL FROM:<>. |
804 | XXX We don't care about that for postmaster_full. Should we? */ | |
193e3acd | 805 | |
e9166683 JH |
806 | if ((done = |
807 | smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0 && | |
808 | smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), | |
809 | '2', callout))) | |
810 | break; | |
65f1c92a | 811 | |
65f1c92a | 812 | HDEBUG(D_acl|D_v) |
e1d04f48 | 813 | debug_printf_indent("problem after random/rset/mfrom; reopen conn\n"); |
65f1c92a JH |
814 | random_local_part = NULL; |
815 | #ifdef SUPPORT_TLS | |
816 | tls_close(FALSE, TRUE); | |
817 | #endif | |
e1d04f48 | 818 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); |
02b41d71 | 819 | (void)close(sx.inblock.sock); |
e9166683 | 820 | sx.inblock.sock = sx.outblock.sock = -1; |
0cbf2b82 | 821 | #ifndef DISABLE_EVENT |
65f1c92a JH |
822 | (void) event_raise(addr->transport->event_action, |
823 | US"tcp:close", NULL); | |
824 | #endif | |
a65c4156 JH |
825 | addr->address = main_address; |
826 | addr->transport_return = PENDING_DEFER; | |
827 | sx.first_addr = sx.sync_addr = addr; | |
828 | sx.ok = FALSE; | |
829 | sx.send_rset = TRUE; | |
830 | sx.completed_addr = FALSE; | |
65f1c92a | 831 | goto tls_retry_connection; |
e9166683 | 832 | } |
059ec3d9 | 833 | |
e9166683 JH |
834 | /* Re-setup for main verify, or for the error message when failing */ |
835 | addr->address = main_address; | |
836 | addr->transport_return = PENDING_DEFER; | |
837 | sx.first_addr = sx.sync_addr = addr; | |
838 | sx.ok = FALSE; | |
839 | sx.send_rset = TRUE; | |
840 | sx.completed_addr = FALSE; | |
841 | } | |
842 | else | |
843 | done = TRUE; | |
921dfc11 | 844 | |
e9166683 JH |
845 | /* Main verify. If the host is accepting all local parts, as determined |
846 | by the "random" check, we don't need to waste time doing any further | |
847 | checking. */ | |
848 | ||
849 | if (done) | |
850 | { | |
851 | done = FALSE; | |
852 | switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield)) | |
853 | { | |
854 | case 0: switch(addr->transport_return) /* ok so far */ | |
855 | { | |
856 | case PENDING_OK: done = TRUE; | |
857 | new_address_record.result = ccache_accept; | |
858 | break; | |
859 | case FAIL: done = TRUE; | |
860 | yield = FAIL; | |
861 | *failure_ptr = US"recipient"; | |
862 | new_address_record.result = ccache_reject; | |
863 | break; | |
864 | default: break; | |
865 | } | |
866 | break; | |
867 | ||
868 | case -1: /* MAIL response error */ | |
869 | *failure_ptr = US"mail"; | |
870 | if (errno == 0 && sx.buffer[0] == '5') | |
871 | { | |
872 | setflag(addr, af_verify_nsfail); | |
873 | if (from_address[0] == 0) | |
874 | new_domain_record.result = ccache_reject_mfnull; | |
875 | } | |
876 | break; | |
877 | /* non-MAIL read i/o error */ | |
878 | /* non-MAIL response timeout */ | |
879 | /* internal error; channel still usable */ | |
880 | default: break; /* transmit failed */ | |
881 | } | |
882 | } | |
883 | ||
884 | addr->auth_sndr = client_authenticated_sender; | |
885 | ||
886 | deliver_host = deliver_host_address = NULL; | |
887 | deliver_domain = save_deliver_domain; | |
888 | ||
889 | /* Do postmaster check if requested; if a full check is required, we | |
890 | check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */ | |
891 | ||
892 | if (done && pm_mailfrom) | |
893 | { | |
894 | /* Could possibly shift before main verify, just above, and be ok | |
895 | for cutthrough. But no way to handle a subsequent rcpt, so just | |
896 | refuse any */ | |
57cc2785 | 897 | cancel_cutthrough_connection(TRUE, US"postmaster verify"); |
e1d04f48 | 898 | HDEBUG(D_acl|D_v) debug_printf_indent("Cutthrough cancelled by presence of postmaster verify\n"); |
e9166683 JH |
899 | |
900 | done = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0 | |
901 | && smtp_read_response(&sx.inblock, sx.buffer, | |
902 | sizeof(sx.buffer), '2', callout); | |
903 | ||
904 | if (done) | |
905 | { | |
906 | uschar * main_address = addr->address; | |
907 | ||
908 | /*XXX oops, affixes */ | |
909 | addr->address = string_sprintf("postmaster@%.1000s", addr->domain); | |
910 | addr->transport_return = PENDING_DEFER; | |
911 | ||
912 | sx.from_addr = pm_mailfrom; | |
913 | sx.first_addr = sx.sync_addr = addr; | |
914 | sx.ok = FALSE; | |
915 | sx.send_rset = TRUE; | |
916 | sx.completed_addr = FALSE; | |
917 | ||
918 | if( smtp_write_mail_and_rcpt_cmds(&sx, &yield) == 0 | |
919 | && addr->transport_return == PENDING_OK | |
920 | ) | |
921 | done = TRUE; | |
921dfc11 | 922 | else |
e9166683 JH |
923 | done = (options & vopt_callout_fullpm) != 0 |
924 | && smtp_write_command(&sx.outblock, FALSE, | |
925 | "RCPT TO:<postmaster>\r\n") >= 0 | |
926 | && smtp_read_response(&sx.inblock, sx.buffer, | |
927 | sizeof(sx.buffer), '2', callout); | |
921dfc11 | 928 | |
e9166683 | 929 | /* Sort out the cache record */ |
2a4be8f9 | 930 | |
e9166683 JH |
931 | new_domain_record.postmaster_stamp = time(NULL); |
932 | ||
933 | if (done) | |
934 | new_domain_record.postmaster_result = ccache_accept; | |
935 | else if (errno == 0 && sx.buffer[0] == '5') | |
936 | { | |
937 | *failure_ptr = US"postmaster"; | |
938 | setflag(addr, af_verify_pmfail); | |
939 | new_domain_record.postmaster_result = ccache_reject; | |
940 | } | |
941 | ||
942 | addr->address = main_address; | |
943 | } | |
944 | } | |
193e3acd JH |
945 | /* For any failure of the main check, other than a negative response, we just |
946 | close the connection and carry on. We can identify a negative response by the | |
947 | fact that errno is zero. For I/O errors it will be non-zero | |
2a4be8f9 | 948 | |
193e3acd JH |
949 | Set up different error texts for logging and for sending back to the caller |
950 | as an SMTP response. Log in all cases, using a one-line format. For sender | |
951 | callouts, give a full response to the caller, but for recipient callouts, | |
952 | don't give the IP address because this may be an internal host whose identity | |
953 | is not to be widely broadcast. */ | |
2a4be8f9 | 954 | |
02b41d71 | 955 | no_conn: |
e9166683 | 956 | switch(errno) |
193e3acd | 957 | { |
02b41d71 JH |
958 | case ETIMEDOUT: |
959 | HDEBUG(D_verify) debug_printf("SMTP timeout\n"); | |
960 | sx.send_quit = FALSE; | |
961 | break; | |
962 | ||
8c5d388a | 963 | #ifdef SUPPORT_I18N |
02b41d71 | 964 | case ERRNO_UTF8_FWD: |
9bfc60eb JH |
965 | { |
966 | extern int acl_where; /* src/acl.c */ | |
967 | errno = 0; | |
968 | addr->message = string_sprintf( | |
e9166683 | 969 | "response to \"EHLO\" did not include SMTPUTF8"); |
02b41d71 JH |
970 | addr->user_message = acl_where == ACL_WHERE_RCPT |
971 | ? US"533 no support for internationalised mailbox name" | |
9bfc60eb JH |
972 | : US"550 mailbox unavailable"; |
973 | yield = FAIL; | |
974 | done = TRUE; | |
975 | } | |
02b41d71 | 976 | break; |
9bfc60eb | 977 | #endif |
02b41d71 JH |
978 | case ECONNREFUSED: |
979 | sx.send_quit = FALSE; | |
980 | break; | |
2a4be8f9 | 981 | |
02b41d71 | 982 | case 0: |
e9166683 | 983 | if (*sx.buffer == 0) Ustrcpy(sx.buffer, US"connection dropped"); |
059ec3d9 | 984 | |
e9166683 JH |
985 | /*XXX test here is ugly; seem to have a split of responsibility for |
986 | building this message. Need to reationalise. Where is it done | |
987 | before here, and when not? | |
988 | Not == 5xx resp to MAIL on main-verify | |
989 | */ | |
990 | if (!addr->message) addr->message = | |
991 | string_sprintf("response to \"%s\" was: %s", | |
992 | big_buffer, string_printing(sx.buffer)); | |
02b41d71 JH |
993 | |
994 | addr->user_message = options & vopt_is_recipient | |
e9166683 | 995 | ? string_sprintf("Callout verification failed:\n%s", sx.buffer) |
02b41d71 | 996 | : string_sprintf("Called: %s\nSent: %s\nResponse: %s", |
e9166683 | 997 | host->address, big_buffer, sx.buffer); |
059ec3d9 | 998 | |
02b41d71 | 999 | /* Hard rejection ends the process */ |
193e3acd | 1000 | |
e9166683 | 1001 | if (sx.buffer[0] == '5') /* Address rejected */ |
02b41d71 JH |
1002 | { |
1003 | yield = FAIL; | |
1004 | done = TRUE; | |
1005 | } | |
1006 | break; | |
193e3acd | 1007 | } |
059ec3d9 | 1008 | |
193e3acd JH |
1009 | /* End the SMTP conversation and close the connection. */ |
1010 | ||
4c04137d | 1011 | /* Cutthrough - on a successful connect and recipient-verify with |
5032d1cf | 1012 | use-sender and we are 1st rcpt and have no cutthrough conn so far |
57cc2785 JH |
1013 | here is where we want to leave the conn open. Ditto for a lazy-close |
1014 | verify. */ | |
1015 | ||
1016 | if ( (cutthrough.delivery || options & vopt_callout_hold) | |
5032d1cf | 1017 | && rcpt_count == 1 |
193e3acd JH |
1018 | && done |
1019 | && yield == OK | |
98c82a3d JH |
1020 | && (options & (vopt_callout_recipsender|vopt_callout_recippmaster|vopt_success_on_redirect)) |
1021 | == vopt_callout_recipsender | |
193e3acd JH |
1022 | && !random_local_part |
1023 | && !pm_mailfrom | |
5032d1cf | 1024 | && cutthrough.fd < 0 |
02b41d71 | 1025 | && !sx.lmtp |
193e3acd | 1026 | ) |
059ec3d9 | 1027 | { |
57cc2785 JH |
1028 | HDEBUG(D_acl|D_v) debug_printf_indent("holding verify callout open for %s\n", |
1029 | cutthrough.delivery | |
1030 | ? "cutthrough delivery" : "potential further verifies and delivery"); | |
1031 | ||
1032 | cutthrough.callout_hold_only = !cutthrough.delivery; | |
1033 | cutthrough.is_tls = tls_out.active >= 0; | |
1034 | cutthrough.fd = sx.outblock.sock; /* We assume no buffer in use in the outblock */ | |
1035 | cutthrough.nrcpt = 1; | |
1036 | cutthrough.transport = addr->transport->name; | |
1037 | cutthrough.interface = interface; | |
1038 | cutthrough.snd_port = sending_port; | |
1039 | cutthrough.peer_options = smtp_peer_options; | |
1040 | cutthrough.host = *host; | |
1041 | { | |
1042 | int oldpool = store_pool; | |
1043 | store_pool = POOL_PERM; | |
1044 | cutthrough.snd_ip = string_copy(sending_ip_address); | |
1045 | cutthrough.host.name = string_copy(host->name); | |
1046 | cutthrough.host.address = string_copy(host->address); | |
1047 | store_pool = oldpool; | |
1048 | } | |
1049 | cutthrough.addr = *addr; /* Save the address_item for later logging */ | |
1050 | cutthrough.addr.next = NULL; | |
5032d1cf | 1051 | cutthrough.addr.host_used = &cutthrough.host; |
193e3acd | 1052 | if (addr->parent) |
5032d1cf JH |
1053 | *(cutthrough.addr.parent = store_get(sizeof(address_item))) = |
1054 | *addr->parent; | |
193e3acd JH |
1055 | ctblock.buffer = ctbuffer; |
1056 | ctblock.buffersize = sizeof(ctbuffer); | |
1057 | ctblock.ptr = ctbuffer; | |
1058 | /* ctblock.cmd_count = 0; ctblock.authenticating = FALSE; */ | |
5032d1cf | 1059 | ctblock.sock = cutthrough.fd; |
059ec3d9 | 1060 | } |
193e3acd | 1061 | else |
059ec3d9 | 1062 | { |
57cc2785 | 1063 | /* Ensure no cutthrough on multiple verifies that were incompatible */ |
193e3acd | 1064 | if (options & vopt_callout_recipsender) |
57cc2785 | 1065 | cancel_cutthrough_connection(TRUE, US"not usable for cutthrough"); |
02b41d71 | 1066 | if (sx.send_quit) |
2760b518 | 1067 | { |
02b41d71 | 1068 | (void) smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n"); |
059ec3d9 | 1069 | |
2760b518 | 1070 | /* Wait a short time for response, and discard it */ |
e9166683 | 1071 | smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), |
2760b518 JH |
1072 | '2', 1); |
1073 | } | |
1074 | ||
02b41d71 JH |
1075 | if (sx.inblock.sock >= 0) |
1076 | { | |
a7538db1 | 1077 | #ifdef SUPPORT_TLS |
02b41d71 | 1078 | tls_close(FALSE, TRUE); |
a7538db1 | 1079 | #endif |
e1d04f48 | 1080 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); |
02b41d71 JH |
1081 | (void)close(sx.inblock.sock); |
1082 | sx.inblock.sock = sx.outblock.sock = -1; | |
0cbf2b82 | 1083 | #ifndef DISABLE_EVENT |
02b41d71 | 1084 | (void) event_raise(addr->transport->event_action, US"tcp:close", NULL); |
a7538db1 | 1085 | #endif |
02b41d71 | 1086 | } |
059ec3d9 | 1087 | } |
059ec3d9 | 1088 | |
e9166683 JH |
1089 | if (!done || yield != OK) |
1090 | addr->message = string_sprintf("%s [%s] : %s", host->name, host->address, | |
1091 | addr->message); | |
193e3acd JH |
1092 | } /* Loop through all hosts, while !done */ |
1093 | } | |
059ec3d9 PH |
1094 | |
1095 | /* If we get here with done == TRUE, a successful callout happened, and yield | |
1096 | will be set OK or FAIL according to the response to the RCPT command. | |
1097 | Otherwise, we looped through the hosts but couldn't complete the business. | |
707ee5b1 | 1098 | However, there may be domain-specific information to cache in both cases. */ |
059ec3d9 | 1099 | |
707ee5b1 JH |
1100 | if (!(options & vopt_callout_no_cache)) |
1101 | cache_callout_write(&new_domain_record, addr->domain, | |
1102 | done, &new_address_record, address_key); | |
059ec3d9 PH |
1103 | |
1104 | /* Failure to connect to any host, or any response other than 2xx or 5xx is a | |
1105 | temporary error. If there was only one host, and a response was received, leave | |
1106 | it alone if supplying details. Otherwise, give a generic response. */ | |
1107 | ||
707ee5b1 | 1108 | if (!done) |
059ec3d9 | 1109 | { |
ff5929e3 | 1110 | uschar * dullmsg = string_sprintf("Could not complete %s verify callout", |
8b9476ba | 1111 | options & vopt_is_recipient ? "recipient" : "sender"); |
059ec3d9 PH |
1112 | yield = DEFER; |
1113 | ||
02b41d71 JH |
1114 | addr->message = host_list->next || !addr->message |
1115 | ? dullmsg : string_sprintf("%s: %s", dullmsg, addr->message); | |
059ec3d9 | 1116 | |
ff5929e3 JH |
1117 | addr->user_message = smtp_return_error_details |
1118 | ? string_sprintf("%s for <%s>.\n" | |
059ec3d9 PH |
1119 | "The mail server(s) for the domain may be temporarily unreachable, or\n" |
1120 | "they may be permanently unreachable from this server. In the latter case,\n%s", | |
1121 | dullmsg, addr->address, | |
8b9476ba | 1122 | options & vopt_is_recipient |
ff5929e3 | 1123 | ? "the address will never be accepted." |
8b9476ba JH |
1124 | : "you need to change the address or create an MX record for its domain\n" |
1125 | "if it is supposed to be generally accessible from the Internet.\n" | |
ff5929e3 JH |
1126 | "Talk to your mail administrator for details.") |
1127 | : dullmsg; | |
059ec3d9 PH |
1128 | |
1129 | /* Force a specific error code */ | |
1130 | ||
1131 | addr->basic_errno = ERRNO_CALLOUTDEFER; | |
1132 | } | |
1133 | ||
1134 | /* Come here from within the cache-reading code on fast-track exit. */ | |
1135 | ||
1136 | END_CALLOUT: | |
02b41d71 | 1137 | tls_modify_variables(&tls_in); |
059ec3d9 PH |
1138 | return yield; |
1139 | } | |
1140 | ||
1141 | ||
1142 | ||
817d9f57 JH |
1143 | /* Called after recipient-acl to get a cutthrough connection open when |
1144 | one was requested and a recipient-verify wasn't subsequently done. | |
1145 | */ | |
f9334a28 | 1146 | int |
e4bdf652 JH |
1147 | open_cutthrough_connection( address_item * addr ) |
1148 | { | |
1149 | address_item addr2; | |
f9334a28 | 1150 | int rc; |
e4bdf652 JH |
1151 | |
1152 | /* Use a recipient-verify-callout to set up the cutthrough connection. */ | |
1153 | /* We must use a copy of the address for verification, because it might | |
1154 | get rewritten. */ | |
1155 | ||
1156 | addr2 = *addr; | |
e1d04f48 | 1157 | HDEBUG(D_acl) debug_printf_indent("----------- %s cutthrough setup ------------\n", |
5032d1cf | 1158 | rcpt_count > 1 ? "more" : "start"); |
ff5929e3 | 1159 | rc = verify_address(&addr2, NULL, |
e4bdf652 JH |
1160 | vopt_is_recipient | vopt_callout_recipsender | vopt_callout_no_cache, |
1161 | CUTTHROUGH_CMD_TIMEOUT, -1, -1, | |
1162 | NULL, NULL, NULL); | |
ff5929e3 JH |
1163 | addr->message = addr2.message; |
1164 | addr->user_message = addr2.user_message; | |
e1d04f48 | 1165 | HDEBUG(D_acl) debug_printf_indent("----------- end cutthrough setup ------------\n"); |
f9334a28 | 1166 | return rc; |
e4bdf652 JH |
1167 | } |
1168 | ||
1169 | ||
e4bdf652 | 1170 | |
817d9f57 JH |
1171 | /* Send given number of bytes from the buffer */ |
1172 | static BOOL | |
1173 | cutthrough_send(int n) | |
e4bdf652 | 1174 | { |
5032d1cf | 1175 | if(cutthrough.fd < 0) |
817d9f57 | 1176 | return TRUE; |
e4bdf652 | 1177 | |
817d9f57 JH |
1178 | if( |
1179 | #ifdef SUPPORT_TLS | |
5032d1cf | 1180 | (tls_out.active == cutthrough.fd) ? tls_write(FALSE, ctblock.buffer, n) : |
817d9f57 | 1181 | #endif |
5032d1cf | 1182 | send(cutthrough.fd, ctblock.buffer, n, 0) > 0 |
817d9f57 JH |
1183 | ) |
1184 | { | |
1185 | transport_count += n; | |
1186 | ctblock.ptr= ctblock.buffer; | |
1187 | return TRUE; | |
1188 | } | |
e4bdf652 | 1189 | |
e1d04f48 | 1190 | HDEBUG(D_transport|D_acl) debug_printf_indent("cutthrough_send failed: %s\n", strerror(errno)); |
817d9f57 | 1191 | return FALSE; |
e4bdf652 JH |
1192 | } |
1193 | ||
1194 | ||
1195 | ||
817d9f57 JH |
1196 | static BOOL |
1197 | _cutthrough_puts(uschar * cp, int n) | |
1198 | { | |
1199 | while(n--) | |
1200 | { | |
1201 | if(ctblock.ptr >= ctblock.buffer+ctblock.buffersize) | |
1202 | if(!cutthrough_send(ctblock.buffersize)) | |
1203 | return FALSE; | |
1204 | ||
1205 | *ctblock.ptr++ = *cp++; | |
1206 | } | |
1207 | return TRUE; | |
1208 | } | |
1209 | ||
1210 | /* Buffered output of counted data block. Return boolean success */ | |
57cc2785 | 1211 | static BOOL |
e4bdf652 JH |
1212 | cutthrough_puts(uschar * cp, int n) |
1213 | { | |
5032d1cf | 1214 | if (cutthrough.fd < 0) return TRUE; |
817d9f57 | 1215 | if (_cutthrough_puts(cp, n)) return TRUE; |
57cc2785 | 1216 | cancel_cutthrough_connection(TRUE, US"transmit failed"); |
817d9f57 JH |
1217 | return FALSE; |
1218 | } | |
e4bdf652 | 1219 | |
57cc2785 JH |
1220 | BOOL |
1221 | cutthrough_data_puts(uschar * cp, int n) | |
1222 | { | |
1223 | if (cutthrough.delivery) cutthrough_puts(cp, n); | |
1224 | } | |
1225 | ||
e4bdf652 | 1226 | |
817d9f57 | 1227 | static BOOL |
5032d1cf | 1228 | _cutthrough_flush_send(void) |
817d9f57 | 1229 | { |
57cc2785 | 1230 | int n = ctblock.ptr - ctblock.buffer; |
e4bdf652 | 1231 | |
817d9f57 JH |
1232 | if(n>0) |
1233 | if(!cutthrough_send(n)) | |
1234 | return FALSE; | |
1235 | return TRUE; | |
e4bdf652 JH |
1236 | } |
1237 | ||
817d9f57 JH |
1238 | |
1239 | /* Send out any bufferred output. Return boolean success. */ | |
e4bdf652 | 1240 | BOOL |
5032d1cf | 1241 | cutthrough_flush_send(void) |
e4bdf652 | 1242 | { |
817d9f57 | 1243 | if (_cutthrough_flush_send()) return TRUE; |
57cc2785 | 1244 | cancel_cutthrough_connection(TRUE, US"transmit failed"); |
e4bdf652 JH |
1245 | return FALSE; |
1246 | } | |
1247 | ||
1248 | ||
57cc2785 | 1249 | static BOOL |
5032d1cf | 1250 | cutthrough_put_nl(void) |
e4bdf652 JH |
1251 | { |
1252 | return cutthrough_puts(US"\r\n", 2); | |
1253 | } | |
1254 | ||
1255 | ||
57cc2785 JH |
1256 | BOOL |
1257 | cutthrough_data_put_nl(void) | |
1258 | { | |
1259 | return cutthrough_data_puts(US"\r\n", 2); | |
1260 | } | |
1261 | ||
1262 | ||
e4bdf652 JH |
1263 | /* Get and check response from cutthrough target */ |
1264 | static uschar | |
57cc2785 | 1265 | cutthrough_response(int fd, char expect, uschar ** copy, int timeout) |
e4bdf652 JH |
1266 | { |
1267 | smtp_inblock inblock; | |
1268 | uschar inbuffer[4096]; | |
1269 | uschar responsebuffer[4096]; | |
1270 | ||
1271 | inblock.buffer = inbuffer; | |
1272 | inblock.buffersize = sizeof(inbuffer); | |
1273 | inblock.ptr = inbuffer; | |
1274 | inblock.ptrend = inbuffer; | |
57cc2785 | 1275 | inblock.sock = fd; |
817d9f57 | 1276 | /* this relies on (inblock.sock == tls_out.active) */ |
2760b518 | 1277 | if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, timeout)) |
57cc2785 | 1278 | cancel_cutthrough_connection(TRUE, US"target timeout on read"); |
e4bdf652 | 1279 | |
57cc2785 | 1280 | if(copy) |
e4bdf652 JH |
1281 | { |
1282 | uschar * cp; | |
5032d1cf | 1283 | *copy = cp = string_copy(responsebuffer); |
e4bdf652 JH |
1284 | /* Trim the trailing end of line */ |
1285 | cp += Ustrlen(responsebuffer); | |
1286 | if(cp > *copy && cp[-1] == '\n') *--cp = '\0'; | |
1287 | if(cp > *copy && cp[-1] == '\r') *--cp = '\0'; | |
1288 | } | |
1289 | ||
1290 | return responsebuffer[0]; | |
1291 | } | |
1292 | ||
1293 | ||
1294 | /* Negotiate dataphase with the cutthrough target, returning success boolean */ | |
1295 | BOOL | |
5032d1cf | 1296 | cutthrough_predata(void) |
e4bdf652 | 1297 | { |
57cc2785 | 1298 | if(cutthrough.fd < 0 || cutthrough.callout_hold_only) |
e4bdf652 JH |
1299 | return FALSE; |
1300 | ||
e1d04f48 | 1301 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> DATA\n"); |
817d9f57 JH |
1302 | cutthrough_puts(US"DATA\r\n", 6); |
1303 | cutthrough_flush_send(); | |
e4bdf652 JH |
1304 | |
1305 | /* Assume nothing buffered. If it was it gets ignored. */ | |
57cc2785 | 1306 | return cutthrough_response(cutthrough.fd, '3', NULL, CUTTHROUGH_DATA_TIMEOUT) == '3'; |
e4bdf652 JH |
1307 | } |
1308 | ||
1309 | ||
6d5c916c | 1310 | /* fd and tctx args only to match write_chunk() */ |
511a6c14 | 1311 | static BOOL |
6d5c916c | 1312 | cutthrough_write_chunk(int fd, transport_ctx * tctx, uschar * s, int len) |
511a6c14 JH |
1313 | { |
1314 | uschar * s2; | |
1315 | while(s && (s2 = Ustrchr(s, '\n'))) | |
1316 | { | |
1317 | if(!cutthrough_puts(s, s2-s) || !cutthrough_put_nl()) | |
1318 | return FALSE; | |
1319 | s = s2+1; | |
1320 | } | |
1321 | return TRUE; | |
1322 | } | |
1323 | ||
1324 | ||
e4bdf652 | 1325 | /* Buffered send of headers. Return success boolean. */ |
817d9f57 | 1326 | /* Expands newlines to wire format (CR,NL). */ |
e4bdf652 | 1327 | /* Also sends header-terminating blank line. */ |
e4bdf652 | 1328 | BOOL |
5032d1cf | 1329 | cutthrough_headers_send(void) |
e4bdf652 | 1330 | { |
6d5c916c JH |
1331 | transport_ctx tctx; |
1332 | ||
57cc2785 | 1333 | if(cutthrough.fd < 0 || cutthrough.callout_hold_only) |
e4bdf652 JH |
1334 | return FALSE; |
1335 | ||
511a6c14 JH |
1336 | /* We share a routine with the mainline transport to handle header add/remove/rewrites, |
1337 | but having a separate buffered-output function (for now) | |
1338 | */ | |
e1d04f48 | 1339 | HDEBUG(D_acl) debug_printf_indent("----------- start cutthrough headers send -----------\n"); |
e4bdf652 | 1340 | |
6d5c916c JH |
1341 | tctx.tblock = cutthrough.addr.transport; |
1342 | tctx.addr = &cutthrough.addr; | |
1343 | tctx.check_string = US"."; | |
1344 | tctx.escape_string = US".."; | |
1345 | tctx.options = topt_use_crlf; | |
1346 | ||
1347 | if (!transport_headers_send(cutthrough.fd, &tctx, &cutthrough_write_chunk)) | |
511a6c14 JH |
1348 | return FALSE; |
1349 | ||
e1d04f48 | 1350 | HDEBUG(D_acl) debug_printf_indent("----------- done cutthrough headers send ------------\n"); |
511a6c14 | 1351 | return TRUE; |
817d9f57 JH |
1352 | } |
1353 | ||
1354 | ||
1355 | static void | |
5032d1cf | 1356 | close_cutthrough_connection(const char * why) |
817d9f57 | 1357 | { |
57cc2785 JH |
1358 | int fd = cutthrough.fd; |
1359 | if(fd >= 0) | |
817d9f57 JH |
1360 | { |
1361 | /* We could be sending this after a bunch of data, but that is ok as | |
1362 | the only way to cancel the transfer in dataphase is to drop the tcp | |
1363 | conn before the final dot. | |
1364 | */ | |
1365 | ctblock.ptr = ctbuffer; | |
e1d04f48 | 1366 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n"); |
817d9f57 JH |
1367 | _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */ |
1368 | _cutthrough_flush_send(); | |
57cc2785 | 1369 | cutthrough.fd = -1; /* avoid recursion via read timeout */ |
2760b518 JH |
1370 | |
1371 | /* Wait a short time for response, and discard it */ | |
57cc2785 | 1372 | cutthrough_response(fd, '2', NULL, 1); |
817d9f57 | 1373 | |
57cc2785 | 1374 | #ifdef SUPPORT_TLS |
817d9f57 | 1375 | tls_close(FALSE, TRUE); |
57cc2785 | 1376 | #endif |
e1d04f48 | 1377 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); |
57cc2785 | 1378 | (void)close(fd); |
e1d04f48 | 1379 | HDEBUG(D_acl) debug_printf_indent("----------- cutthrough shutdown (%s) ------------\n", why); |
817d9f57 JH |
1380 | } |
1381 | ctblock.ptr = ctbuffer; | |
e4bdf652 JH |
1382 | } |
1383 | ||
817d9f57 | 1384 | void |
57cc2785 JH |
1385 | cancel_cutthrough_connection(BOOL close_noncutthrough_verifies, const uschar * why) |
1386 | { | |
1387 | if (cutthrough.delivery || close_noncutthrough_verifies) | |
1388 | close_cutthrough_connection(why); | |
1389 | cutthrough.delivery = cutthrough.callout_hold_only = FALSE; | |
1390 | } | |
1391 | ||
1392 | ||
1393 | void | |
1394 | release_cutthrough_connection(const uschar * why) | |
817d9f57 | 1395 | { |
57cc2785 JH |
1396 | HDEBUG(D_acl) debug_printf_indent("release cutthrough conn: %s\n", why); |
1397 | cutthrough.fd = -1; | |
1398 | cutthrough.delivery = cutthrough.callout_hold_only = FALSE; | |
817d9f57 JH |
1399 | } |
1400 | ||
1401 | ||
1402 | ||
e4bdf652 JH |
1403 | |
1404 | /* Have senders final-dot. Send one to cutthrough target, and grab the response. | |
1405 | Log an OK response as a transmission. | |
817d9f57 | 1406 | Close the connection. |
e4bdf652 | 1407 | Return smtp response-class digit. |
e4bdf652 JH |
1408 | */ |
1409 | uschar * | |
5032d1cf | 1410 | cutthrough_finaldot(void) |
e4bdf652 | 1411 | { |
5032d1cf JH |
1412 | uschar res; |
1413 | address_item * addr; | |
e1d04f48 | 1414 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> .\n"); |
e4bdf652 JH |
1415 | |
1416 | /* Assume data finshed with new-line */ | |
5032d1cf JH |
1417 | if( !cutthrough_puts(US".", 1) |
1418 | || !cutthrough_put_nl() | |
1419 | || !cutthrough_flush_send() | |
1420 | ) | |
1421 | return cutthrough.addr.message; | |
e4bdf652 | 1422 | |
57cc2785 | 1423 | res = cutthrough_response(cutthrough.fd, '2', &cutthrough.addr.message, CUTTHROUGH_DATA_TIMEOUT); |
5032d1cf | 1424 | for (addr = &cutthrough.addr; addr; addr = addr->next) |
817d9f57 | 1425 | { |
5032d1cf JH |
1426 | addr->message = cutthrough.addr.message; |
1427 | switch(res) | |
1428 | { | |
1429 | case '2': | |
1430 | delivery_log(LOG_MAIN, addr, (int)'>', NULL); | |
1431 | close_cutthrough_connection("delivered"); | |
1432 | break; | |
817d9f57 | 1433 | |
5032d1cf JH |
1434 | case '4': |
1435 | delivery_log(LOG_MAIN, addr, 0, | |
1436 | US"tmp-reject from cutthrough after DATA:"); | |
1437 | break; | |
e4bdf652 | 1438 | |
5032d1cf JH |
1439 | case '5': |
1440 | delivery_log(LOG_MAIN|LOG_REJECT, addr, 0, | |
1441 | US"rejected after DATA:"); | |
1442 | break; | |
e4bdf652 | 1443 | |
5032d1cf JH |
1444 | default: |
1445 | break; | |
1446 | } | |
817d9f57 | 1447 | } |
5032d1cf | 1448 | return cutthrough.addr.message; |
e4bdf652 JH |
1449 | } |
1450 | ||
1451 | ||
817d9f57 | 1452 | |
059ec3d9 PH |
1453 | /************************************************* |
1454 | * Copy error to toplevel address * | |
1455 | *************************************************/ | |
1456 | ||
1457 | /* This function is used when a verify fails or defers, to ensure that the | |
1458 | failure or defer information is in the original toplevel address. This applies | |
1459 | when an address is redirected to a single new address, and the failure or | |
1460 | deferral happens to the child address. | |
1461 | ||
1462 | Arguments: | |
1463 | vaddr the verify address item | |
1464 | addr the final address item | |
1465 | yield FAIL or DEFER | |
1466 | ||
1467 | Returns: the value of YIELD | |
1468 | */ | |
1469 | ||
1470 | static int | |
1471 | copy_error(address_item *vaddr, address_item *addr, int yield) | |
1472 | { | |
1473 | if (addr != vaddr) | |
1474 | { | |
1475 | vaddr->message = addr->message; | |
1476 | vaddr->user_message = addr->user_message; | |
1477 | vaddr->basic_errno = addr->basic_errno; | |
1478 | vaddr->more_errno = addr->more_errno; | |
d43cbe25 | 1479 | vaddr->prop.address_data = addr->prop.address_data; |
42855d71 | 1480 | copyflag(vaddr, addr, af_pass_message); |
059ec3d9 PH |
1481 | } |
1482 | return yield; | |
1483 | } | |
1484 | ||
1485 | ||
1486 | ||
1487 | ||
ce552449 NM |
1488 | /************************************************** |
1489 | * printf that automatically handles TLS if needed * | |
1490 | ***************************************************/ | |
1491 | ||
1492 | /* This function is used by verify_address() as a substitute for all fprintf() | |
1493 | calls; a direct fprintf() will not produce output in a TLS SMTP session, such | |
1494 | as a response to an EXPN command. smtp_in.c makes smtp_printf available but | |
1495 | that assumes that we always use the smtp_out FILE* when not using TLS or the | |
1496 | ssl buffer when we are. Instead we take a FILE* parameter and check to see if | |
1497 | that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular | |
1498 | fprintf(). | |
1499 | ||
1500 | Arguments: | |
1501 | f the candidate FILE* to write to | |
1502 | format format string | |
1503 | ... optional arguments | |
1504 | ||
1505 | Returns: | |
1506 | nothing | |
1507 | */ | |
1508 | ||
1509 | static void PRINTF_FUNCTION(2,3) | |
1ba28e2b | 1510 | respond_printf(FILE *f, const char *format, ...) |
ce552449 NM |
1511 | { |
1512 | va_list ap; | |
1513 | ||
1514 | va_start(ap, format); | |
1515 | if (smtp_out && (f == smtp_out)) | |
1516 | smtp_vprintf(format, ap); | |
1517 | else | |
513afc6a | 1518 | vfprintf(f, format, ap); |
ce552449 NM |
1519 | va_end(ap); |
1520 | } | |
1521 | ||
1522 | ||
1523 | ||
059ec3d9 PH |
1524 | /************************************************* |
1525 | * Verify an email address * | |
1526 | *************************************************/ | |
1527 | ||
1528 | /* This function is used both for verification (-bv and at other times) and | |
1529 | address testing (-bt), which is indicated by address_test_mode being set. | |
1530 | ||
1531 | Arguments: | |
1532 | vaddr contains the address to verify; the next field in this block | |
1533 | must be NULL | |
1534 | f if not NULL, write the result to this file | |
1535 | options various option bits: | |
1536 | vopt_fake_sender => this sender verify is not for the real | |
1537 | sender (it was verify=sender=xxxx or an address from a | |
1538 | header line) - rewriting must not change sender_address | |
1539 | vopt_is_recipient => this is a recipient address, otherwise | |
1540 | it's a sender address - this affects qualification and | |
1541 | rewriting and messages from callouts | |
1542 | vopt_qualify => qualify an unqualified address; else error | |
1543 | vopt_expn => called from SMTP EXPN command | |
eafd343b TK |
1544 | vopt_success_on_redirect => when a new address is generated |
1545 | the verification instantly succeeds | |
059ec3d9 PH |
1546 | |
1547 | These ones are used by do_callout() -- the options variable | |
1548 | is passed to it. | |
1549 | ||
2a4be8f9 | 1550 | vopt_callout_fullpm => if postmaster check, do full one |
059ec3d9 PH |
1551 | vopt_callout_no_cache => don't use callout cache |
1552 | vopt_callout_random => do the "random" thing | |
1553 | vopt_callout_recipsender => use real sender for recipient | |
1554 | vopt_callout_recippmaster => use postmaster for recipient | |
1555 | ||
1556 | callout if > 0, specifies that callout is required, and gives timeout | |
4deaf07d | 1557 | for individual commands |
059ec3d9 PH |
1558 | callout_overall if > 0, gives overall timeout for the callout function; |
1559 | if < 0, a default is used (see do_callout()) | |
8e669ac1 | 1560 | callout_connect the connection timeout for callouts |
059ec3d9 PH |
1561 | se_mailfrom when callout is requested to verify a sender, use this |
1562 | in MAIL FROM; NULL => "" | |
1563 | pm_mailfrom when callout is requested, if non-NULL, do the postmaster | |
1564 | thing and use this as the sender address (may be "") | |
1565 | ||
1566 | routed if not NULL, set TRUE if routing succeeded, so we can | |
1567 | distinguish between routing failed and callout failed | |
1568 | ||
1569 | Returns: OK address verified | |
1570 | FAIL address failed to verify | |
1571 | DEFER can't tell at present | |
1572 | */ | |
1573 | ||
1574 | int | |
1575 | verify_address(address_item *vaddr, FILE *f, int options, int callout, | |
8e669ac1 | 1576 | int callout_overall, int callout_connect, uschar *se_mailfrom, |
4deaf07d | 1577 | uschar *pm_mailfrom, BOOL *routed) |
059ec3d9 PH |
1578 | { |
1579 | BOOL allok = TRUE; | |
1580 | BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0); | |
059ec3d9 | 1581 | BOOL expn = (options & vopt_expn) != 0; |
eafd343b | 1582 | BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0; |
059ec3d9 PH |
1583 | int i; |
1584 | int yield = OK; | |
1585 | int verify_type = expn? v_expn : | |
1586 | address_test_mode? v_none : | |
8b9476ba | 1587 | options & vopt_is_recipient? v_recipient : v_sender; |
059ec3d9 PH |
1588 | address_item *addr_list; |
1589 | address_item *addr_new = NULL; | |
1590 | address_item *addr_remote = NULL; | |
1591 | address_item *addr_local = NULL; | |
1592 | address_item *addr_succeed = NULL; | |
8b9476ba JH |
1593 | uschar **failure_ptr = options & vopt_is_recipient |
1594 | ? &recipient_verify_failure : &sender_verify_failure; | |
059ec3d9 PH |
1595 | uschar *ko_prefix, *cr; |
1596 | uschar *address = vaddr->address; | |
1597 | uschar *save_sender; | |
1598 | uschar null_sender[] = { 0 }; /* Ensure writeable memory */ | |
1599 | ||
2c7db3f5 PH |
1600 | /* Clear, just in case */ |
1601 | ||
1602 | *failure_ptr = NULL; | |
1603 | ||
059ec3d9 PH |
1604 | /* Set up a prefix and suffix for error message which allow us to use the same |
1605 | output statements both in EXPN mode (where an SMTP response is needed) and when | |
1606 | debugging with an output file. */ | |
1607 | ||
1608 | if (expn) | |
1609 | { | |
1610 | ko_prefix = US"553 "; | |
1611 | cr = US"\r"; | |
1612 | } | |
1613 | else ko_prefix = cr = US""; | |
1614 | ||
1615 | /* Add qualify domain if permitted; otherwise an unqualified address fails. */ | |
1616 | ||
1617 | if (parse_find_at(address) == NULL) | |
1618 | { | |
1619 | if ((options & vopt_qualify) == 0) | |
1620 | { | |
1621 | if (f != NULL) | |
ce552449 NM |
1622 | respond_printf(f, "%sA domain is required for \"%s\"%s\n", |
1623 | ko_prefix, address, cr); | |
8e669ac1 | 1624 | *failure_ptr = US"qualify"; |
059ec3d9 PH |
1625 | return FAIL; |
1626 | } | |
8b9476ba | 1627 | address = rewrite_address_qualify(address, options & vopt_is_recipient); |
059ec3d9 PH |
1628 | } |
1629 | ||
1630 | DEBUG(D_verify) | |
1631 | { | |
1632 | debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1633 | debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address); | |
1634 | } | |
1635 | ||
1636 | /* Rewrite and report on it. Clear the domain and local part caches - these | |
1637 | may have been set by domains and local part tests during an ACL. */ | |
1638 | ||
1639 | if (global_rewrite_rules != NULL) | |
1640 | { | |
1641 | uschar *old = address; | |
8b9476ba | 1642 | address = rewrite_address(address, options & vopt_is_recipient, FALSE, |
059ec3d9 PH |
1643 | global_rewrite_rules, rewrite_existflags); |
1644 | if (address != old) | |
1645 | { | |
1646 | for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0; | |
1647 | for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0; | |
1648 | if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address); | |
1649 | } | |
1650 | } | |
1651 | ||
1652 | /* If this is the real sender address, we must update sender_address at | |
1653 | this point, because it may be referred to in the routers. */ | |
1654 | ||
1655 | if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0) | |
1656 | sender_address = address; | |
1657 | ||
1658 | /* If the address was rewritten to <> no verification can be done, and we have | |
1659 | to return OK. This rewriting is permitted only for sender addresses; for other | |
1660 | addresses, such rewriting fails. */ | |
1661 | ||
1662 | if (address[0] == 0) return OK; | |
1663 | ||
d9b2312b JH |
1664 | /* Flip the legacy TLS-related variables over to the outbound set in case |
1665 | they're used in the context of a transport used by verification. Reset them | |
ea90b718 | 1666 | at exit from this routine (so no returns allowed from here on). */ |
d9b2312b | 1667 | |
35aba663 | 1668 | tls_modify_variables(&tls_out); |
d9b2312b | 1669 | |
059ec3d9 PH |
1670 | /* Save a copy of the sender address for re-instating if we change it to <> |
1671 | while verifying a sender address (a nice bit of self-reference there). */ | |
1672 | ||
1673 | save_sender = sender_address; | |
1674 | ||
ea90b718 JH |
1675 | /* Observability variable for router/transport use */ |
1676 | ||
8b9476ba | 1677 | verify_mode = options & vopt_is_recipient ? US"R" : US"S"; |
ea90b718 | 1678 | |
059ec3d9 PH |
1679 | /* Update the address structure with the possibly qualified and rewritten |
1680 | address. Set it up as the starting address on the chain of new addresses. */ | |
1681 | ||
1682 | vaddr->address = address; | |
1683 | addr_new = vaddr; | |
1684 | ||
1685 | /* We need a loop, because an address can generate new addresses. We must also | |
1686 | cope with generated pipes and files at the top level. (See also the code and | |
1687 | comment in deliver.c.) However, it is usually the case that the router for | |
1688 | user's .forward files has its verify flag turned off. | |
1689 | ||
1690 | If an address generates more than one child, the loop is used only when | |
1691 | full_info is set, and this can only be set locally. Remote enquiries just get | |
1692 | information about the top level address, not anything that it generated. */ | |
1693 | ||
ea90b718 | 1694 | while (addr_new) |
059ec3d9 PH |
1695 | { |
1696 | int rc; | |
1697 | address_item *addr = addr_new; | |
1698 | ||
1699 | addr_new = addr->next; | |
1700 | addr->next = NULL; | |
1701 | ||
1702 | DEBUG(D_verify) | |
1703 | { | |
1704 | debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1705 | debug_printf("Considering %s\n", addr->address); | |
1706 | } | |
1707 | ||
1708 | /* Handle generated pipe, file or reply addresses. We don't get these | |
1709 | when handling EXPN, as it does only one level of expansion. */ | |
1710 | ||
1711 | if (testflag(addr, af_pfr)) | |
1712 | { | |
1713 | allok = FALSE; | |
1714 | if (f != NULL) | |
1715 | { | |
1716 | BOOL allow; | |
1717 | ||
1718 | if (addr->address[0] == '>') | |
1719 | { | |
1720 | allow = testflag(addr, af_allow_reply); | |
1721 | fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1); | |
1722 | } | |
1723 | else | |
1724 | { | |
1725 | allow = (addr->address[0] == '|')? | |
1726 | testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file); | |
1727 | fprintf(f, "%s -> %s", addr->parent->address, addr->address); | |
1728 | } | |
1729 | ||
1730 | if (addr->basic_errno == ERRNO_BADTRANSPORT) | |
1731 | fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n" | |
1732 | "%s\n", addr->message); | |
1733 | else if (allow) | |
1734 | fprintf(f, "\n transport = %s\n", addr->transport->name); | |
1735 | else | |
1736 | fprintf(f, " *** forbidden ***\n"); | |
1737 | } | |
1738 | continue; | |
1739 | } | |
1740 | ||
1741 | /* Just in case some router parameter refers to it. */ | |
1742 | ||
2f682e45 JH |
1743 | return_path = addr->prop.errors_address |
1744 | ? addr->prop.errors_address : sender_address; | |
059ec3d9 PH |
1745 | |
1746 | /* Split the address into domain and local part, handling the %-hack if | |
1747 | necessary, and then route it. While routing a sender address, set | |
1748 | $sender_address to <> because that is what it will be if we were trying to | |
1749 | send a bounce to the sender. */ | |
1750 | ||
2f682e45 | 1751 | if (routed) *routed = FALSE; |
059ec3d9 PH |
1752 | if ((rc = deliver_split_address(addr)) == OK) |
1753 | { | |
8b9476ba | 1754 | if (!(options & vopt_is_recipient)) sender_address = null_sender; |
059ec3d9 PH |
1755 | rc = route_address(addr, &addr_local, &addr_remote, &addr_new, |
1756 | &addr_succeed, verify_type); | |
1757 | sender_address = save_sender; /* Put back the real sender */ | |
1758 | } | |
1759 | ||
1760 | /* If routing an address succeeded, set the flag that remembers, for use when | |
1761 | an ACL cached a sender verify (in case a callout fails). Then if routing set | |
1762 | up a list of hosts or the transport has a host list, and the callout option | |
1763 | is set, and we aren't in a host checking run, do the callout verification, | |
1764 | and set another flag that notes that a callout happened. */ | |
1765 | ||
1766 | if (rc == OK) | |
1767 | { | |
2f682e45 | 1768 | if (routed) *routed = TRUE; |
059ec3d9 PH |
1769 | if (callout > 0) |
1770 | { | |
08f3b11b | 1771 | transport_instance * tp; |
2f682e45 | 1772 | host_item * host_list = addr->host_list; |
059ec3d9 | 1773 | |
26da7e20 PH |
1774 | /* Make up some data for use in the case where there is no remote |
1775 | transport. */ | |
1776 | ||
1777 | transport_feedback tf = { | |
1778 | NULL, /* interface (=> any) */ | |
1779 | US"smtp", /* port */ | |
1780 | US"smtp", /* protocol */ | |
1781 | NULL, /* hosts */ | |
1782 | US"$smtp_active_hostname", /* helo_data */ | |
1783 | FALSE, /* hosts_override */ | |
1784 | FALSE, /* hosts_randomize */ | |
1785 | FALSE, /* gethostbyname */ | |
1786 | TRUE, /* qualify_single */ | |
1787 | FALSE /* search_parents */ | |
1788 | }; | |
059ec3d9 PH |
1789 | |
1790 | /* If verification yielded a remote transport, we want to use that | |
1791 | transport's options, so as to mimic what would happen if we were really | |
1792 | sending a message to this address. */ | |
1793 | ||
08f3b11b | 1794 | if ((tp = addr->transport) && !tp->info->local) |
059ec3d9 | 1795 | { |
08f3b11b | 1796 | (void)(tp->setup)(tp, addr, &tf, 0, 0, NULL); |
059ec3d9 PH |
1797 | |
1798 | /* If the transport has hosts and the router does not, or if the | |
1799 | transport is configured to override the router's hosts, we must build a | |
1800 | host list of the transport's hosts, and find the IP addresses */ | |
1801 | ||
2f682e45 | 1802 | if (tf.hosts && (!host_list || tf.hosts_override)) |
059ec3d9 PH |
1803 | { |
1804 | uschar *s; | |
55414b25 | 1805 | const uschar *save_deliver_domain = deliver_domain; |
750af86e | 1806 | uschar *save_deliver_localpart = deliver_localpart; |
059ec3d9 PH |
1807 | |
1808 | host_list = NULL; /* Ignore the router's hosts */ | |
1809 | ||
1810 | deliver_domain = addr->domain; | |
1811 | deliver_localpart = addr->local_part; | |
1812 | s = expand_string(tf.hosts); | |
750af86e PH |
1813 | deliver_domain = save_deliver_domain; |
1814 | deliver_localpart = save_deliver_localpart; | |
059ec3d9 | 1815 | |
2f682e45 | 1816 | if (!s) |
059ec3d9 PH |
1817 | { |
1818 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts " | |
1819 | "\"%s\" in %s transport for callout: %s", tf.hosts, | |
08f3b11b | 1820 | tp->name, expand_string_message); |
059ec3d9 PH |
1821 | } |
1822 | else | |
1823 | { | |
322050c2 | 1824 | int flags; |
d8ef3577 | 1825 | host_item *host, *nexthost; |
059ec3d9 PH |
1826 | host_build_hostlist(&host_list, s, tf.hosts_randomize); |
1827 | ||
1828 | /* Just ignore failures to find a host address. If we don't manage | |
8e669ac1 PH |
1829 | to find any addresses, the callout will defer. Note that more than |
1830 | one address may be found for a single host, which will result in | |
1831 | additional host items being inserted into the chain. Hence we must | |
d8ef3577 | 1832 | save the next host first. */ |
059ec3d9 | 1833 | |
322050c2 PH |
1834 | flags = HOST_FIND_BY_A; |
1835 | if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; | |
1836 | if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS; | |
1837 | ||
2f682e45 | 1838 | for (host = host_list; host; host = nexthost) |
059ec3d9 | 1839 | { |
d8ef3577 | 1840 | nexthost = host->next; |
8e669ac1 | 1841 | if (tf.gethostbyname || |
7e66e54d | 1842 | string_is_ip_address(host->name, NULL) != 0) |
55414b25 | 1843 | (void)host_find_byname(host, NULL, flags, NULL, TRUE); |
059ec3d9 | 1844 | else |
9d9c3746 | 1845 | { |
7cd171b7 | 1846 | dnssec_domains * dnssec_domains = NULL; |
08f3b11b | 1847 | if (Ustrcmp(tp->driver_name, "smtp") == 0) |
9d9c3746 JH |
1848 | { |
1849 | smtp_transport_options_block * ob = | |
08f3b11b | 1850 | (smtp_transport_options_block *) tp->options_block; |
7cd171b7 | 1851 | dnssec_domains = &ob->dnssec; |
9d9c3746 JH |
1852 | } |
1853 | ||
2546388c | 1854 | (void) host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
7cd171b7 | 1855 | dnssec_domains, NULL, NULL); |
9d9c3746 | 1856 | } |
059ec3d9 PH |
1857 | } |
1858 | } | |
1859 | } | |
1860 | } | |
1861 | ||
8e669ac1 | 1862 | /* Can only do a callout if we have at least one host! If the callout |
2c7db3f5 | 1863 | fails, it will have set ${sender,recipient}_verify_failure. */ |
059ec3d9 | 1864 | |
2f682e45 | 1865 | if (host_list) |
059ec3d9 PH |
1866 | { |
1867 | HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n"); | |
1868 | if (host_checking && !host_checking_callout) | |
1869 | { | |
1870 | HDEBUG(D_verify) | |
1871 | debug_printf("... callout omitted by default when host testing\n" | |
1872 | "(Use -bhc if you want the callouts to happen.)\n"); | |
1873 | } | |
1874 | else | |
1875 | { | |
4ed8d31a JH |
1876 | #ifdef SUPPORT_TLS |
1877 | deliver_set_expansions(addr); | |
1878 | #endif | |
059ec3d9 | 1879 | rc = do_callout(addr, host_list, &tf, callout, callout_overall, |
4deaf07d | 1880 | callout_connect, options, se_mailfrom, pm_mailfrom); |
059ec3d9 PH |
1881 | } |
1882 | } | |
1883 | else | |
1884 | { | |
1885 | HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor " | |
1886 | "transport provided a host list\n"); | |
1887 | } | |
1888 | } | |
1889 | } | |
8e669ac1 | 1890 | |
2c7db3f5 | 1891 | /* Otherwise, any failure is a routing failure */ |
8e669ac1 PH |
1892 | |
1893 | else *failure_ptr = US"route"; | |
059ec3d9 PH |
1894 | |
1895 | /* A router may return REROUTED if it has set up a child address as a result | |
1896 | of a change of domain name (typically from widening). In this case we always | |
1897 | want to continue to verify the new child. */ | |
1898 | ||
1899 | if (rc == REROUTED) continue; | |
8e669ac1 | 1900 | |
059ec3d9 PH |
1901 | /* Handle hard failures */ |
1902 | ||
1903 | if (rc == FAIL) | |
1904 | { | |
1905 | allok = FALSE; | |
2f682e45 | 1906 | if (f) |
059ec3d9 | 1907 | { |
e6f6568e PH |
1908 | address_item *p = addr->parent; |
1909 | ||
ce552449 | 1910 | respond_printf(f, "%s%s %s", ko_prefix, |
2f682e45 JH |
1911 | full_info ? addr->address : address, |
1912 | address_test_mode ? "is undeliverable" : "failed to verify"); | |
059ec3d9 PH |
1913 | if (!expn && admin_user) |
1914 | { | |
1915 | if (addr->basic_errno > 0) | |
ce552449 | 1916 | respond_printf(f, ": %s", strerror(addr->basic_errno)); |
2f682e45 | 1917 | if (addr->message) |
ce552449 | 1918 | respond_printf(f, ": %s", addr->message); |
e6f6568e PH |
1919 | } |
1920 | ||
1921 | /* Show parents iff doing full info */ | |
1922 | ||
2f682e45 | 1923 | if (full_info) while (p) |
e6f6568e | 1924 | { |
ce552449 | 1925 | respond_printf(f, "%s\n <-- %s", cr, p->address); |
e6f6568e | 1926 | p = p->parent; |
059ec3d9 | 1927 | } |
ce552449 | 1928 | respond_printf(f, "%s\n", cr); |
059ec3d9 | 1929 | } |
57cc2785 | 1930 | cancel_cutthrough_connection(TRUE, US"routing hard fail"); |
059ec3d9 | 1931 | |
d9b2312b | 1932 | if (!full_info) |
2f682e45 | 1933 | { |
d9b2312b JH |
1934 | yield = copy_error(vaddr, addr, FAIL); |
1935 | goto out; | |
2f682e45 JH |
1936 | } |
1937 | yield = FAIL; | |
059ec3d9 PH |
1938 | } |
1939 | ||
1940 | /* Soft failure */ | |
1941 | ||
1942 | else if (rc == DEFER) | |
1943 | { | |
1944 | allok = FALSE; | |
2f682e45 | 1945 | if (f) |
059ec3d9 | 1946 | { |
e6f6568e | 1947 | address_item *p = addr->parent; |
ce552449 | 1948 | respond_printf(f, "%s%s cannot be resolved at this time", ko_prefix, |
322050c2 | 1949 | full_info? addr->address : address); |
059ec3d9 PH |
1950 | if (!expn && admin_user) |
1951 | { | |
1952 | if (addr->basic_errno > 0) | |
ce552449 | 1953 | respond_printf(f, ": %s", strerror(addr->basic_errno)); |
2f682e45 | 1954 | if (addr->message) |
ce552449 | 1955 | respond_printf(f, ": %s", addr->message); |
059ec3d9 | 1956 | else if (addr->basic_errno <= 0) |
ce552449 | 1957 | respond_printf(f, ": unknown error"); |
059ec3d9 PH |
1958 | } |
1959 | ||
e6f6568e PH |
1960 | /* Show parents iff doing full info */ |
1961 | ||
2f682e45 | 1962 | if (full_info) while (p) |
e6f6568e | 1963 | { |
ce552449 | 1964 | respond_printf(f, "%s\n <-- %s", cr, p->address); |
e6f6568e PH |
1965 | p = p->parent; |
1966 | } | |
ce552449 | 1967 | respond_printf(f, "%s\n", cr); |
059ec3d9 | 1968 | } |
57cc2785 | 1969 | cancel_cutthrough_connection(TRUE, US"routing soft fail"); |
e4bdf652 | 1970 | |
d9b2312b JH |
1971 | if (!full_info) |
1972 | { | |
1973 | yield = copy_error(vaddr, addr, DEFER); | |
1974 | goto out; | |
1975 | } | |
2f682e45 | 1976 | if (yield == OK) yield = DEFER; |
059ec3d9 PH |
1977 | } |
1978 | ||
1979 | /* If we are handling EXPN, we do not want to continue to route beyond | |
e6f6568e | 1980 | the top level (whose address is in "address"). */ |
059ec3d9 PH |
1981 | |
1982 | else if (expn) | |
1983 | { | |
1984 | uschar *ok_prefix = US"250-"; | |
2f682e45 JH |
1985 | |
1986 | if (!addr_new) | |
1987 | if (!addr_local && !addr_remote) | |
ce552449 | 1988 | respond_printf(f, "250 mail to <%s> is discarded\r\n", address); |
059ec3d9 | 1989 | else |
ce552449 | 1990 | respond_printf(f, "250 <%s>\r\n", address); |
2f682e45 JH |
1991 | |
1992 | else do | |
059ec3d9 PH |
1993 | { |
1994 | address_item *addr2 = addr_new; | |
1995 | addr_new = addr2->next; | |
2f682e45 | 1996 | if (!addr_new) ok_prefix = US"250 "; |
ce552449 | 1997 | respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address); |
2f682e45 | 1998 | } while (addr_new); |
d9b2312b JH |
1999 | yield = OK; |
2000 | goto out; | |
059ec3d9 PH |
2001 | } |
2002 | ||
2003 | /* Successful routing other than EXPN. */ | |
2004 | ||
2005 | else | |
2006 | { | |
2007 | /* Handle successful routing when short info wanted. Otherwise continue for | |
2008 | other (generated) addresses. Short info is the operational case. Full info | |
2009 | can be requested only when debug_selector != 0 and a file is supplied. | |
2010 | ||
2011 | There is a conflict between the use of aliasing as an alternate email | |
2012 | address, and as a sort of mailing list. If an alias turns the incoming | |
2013 | address into just one address (e.g. J.Caesar->jc44) you may well want to | |
2014 | carry on verifying the generated address to ensure it is valid when | |
2015 | checking incoming mail. If aliasing generates multiple addresses, you | |
2016 | probably don't want to do this. Exim therefore treats the generation of | |
2017 | just a single new address as a special case, and continues on to verify the | |
2018 | generated address. */ | |
2019 | ||
2f682e45 JH |
2020 | if ( !full_info /* Stop if short info wanted AND */ |
2021 | && ( ( !addr_new /* No new address OR */ | |
2022 | || addr_new->next /* More than one new address OR */ | |
2023 | || testflag(addr_new, af_pfr) /* New address is pfr */ | |
2024 | ) | |
2025 | || /* OR */ | |
2026 | ( addr_new /* At least one new address AND */ | |
2027 | && success_on_redirect /* success_on_redirect is set */ | |
2028 | ) ) | |
2029 | ) | |
059ec3d9 | 2030 | { |
2f682e45 JH |
2031 | if (f) fprintf(f, "%s %s\n", |
2032 | address, address_test_mode ? "is deliverable" : "verified"); | |
059ec3d9 PH |
2033 | |
2034 | /* If we have carried on to verify a child address, we want the value | |
2035 | of $address_data to be that of the child */ | |
2036 | ||
d43cbe25 | 2037 | vaddr->prop.address_data = addr->prop.address_data; |
98c82a3d JH |
2038 | |
2039 | /* If stopped because more than one new address, cannot cutthrough */ | |
2040 | ||
2041 | if (addr_new && addr_new->next) | |
57cc2785 | 2042 | cancel_cutthrough_connection(TRUE, US"multiple addresses from routing"); |
98c82a3d | 2043 | |
d9b2312b JH |
2044 | yield = OK; |
2045 | goto out; | |
059ec3d9 PH |
2046 | } |
2047 | } | |
2048 | } /* Loop for generated addresses */ | |
2049 | ||
2050 | /* Display the full results of the successful routing, including any generated | |
2051 | addresses. Control gets here only when full_info is set, which requires f not | |
2052 | to be NULL, and this occurs only when a top-level verify is called with the | |
2053 | debugging switch on. | |
2054 | ||
2055 | If there are no local and no remote addresses, and there were no pipes, files, | |
2056 | or autoreplies, and there were no errors or deferments, the message is to be | |
2057 | discarded, usually because of the use of :blackhole: in an alias file. */ | |
2058 | ||
2f682e45 | 2059 | if (allok && !addr_local && !addr_remote) |
dbcef0ea | 2060 | { |
059ec3d9 | 2061 | fprintf(f, "mail to %s is discarded\n", address); |
d9b2312b | 2062 | goto out; |
dbcef0ea | 2063 | } |
059ec3d9 | 2064 | |
dbcef0ea | 2065 | for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++) |
08f3b11b | 2066 | while (addr_list) |
059ec3d9 PH |
2067 | { |
2068 | address_item *addr = addr_list; | |
2069 | address_item *p = addr->parent; | |
08f3b11b JH |
2070 | transport_instance * tp = addr->transport; |
2071 | ||
059ec3d9 PH |
2072 | addr_list = addr->next; |
2073 | ||
2074 | fprintf(f, "%s", CS addr->address); | |
384152a6 | 2075 | #ifdef EXPERIMENTAL_SRS |
d43cbe25 JH |
2076 | if(addr->prop.srs_sender) |
2077 | fprintf(f, " [srs = %s]", addr->prop.srs_sender); | |
384152a6 | 2078 | #endif |
dbcef0ea PH |
2079 | |
2080 | /* If the address is a duplicate, show something about it. */ | |
2081 | ||
2082 | if (!testflag(addr, af_pfr)) | |
2083 | { | |
2084 | tree_node *tnode; | |
08f3b11b | 2085 | if ((tnode = tree_search(tree_duplicates, addr->unique))) |
dbcef0ea PH |
2086 | fprintf(f, " [duplicate, would not be delivered]"); |
2087 | else tree_add_duplicate(addr->unique, addr); | |
2088 | } | |
2089 | ||
2090 | /* Now show its parents */ | |
2091 | ||
08f3b11b | 2092 | for (p = addr->parent; p; p = p->parent) |
059ec3d9 | 2093 | fprintf(f, "\n <-- %s", p->address); |
059ec3d9 PH |
2094 | fprintf(f, "\n "); |
2095 | ||
2096 | /* Show router, and transport */ | |
2097 | ||
08f3b11b JH |
2098 | fprintf(f, "router = %s, transport = %s\n", |
2099 | addr->router->name, tp ? tp->name : US"unset"); | |
059ec3d9 PH |
2100 | |
2101 | /* Show any hosts that are set up by a router unless the transport | |
2102 | is going to override them; fiddle a bit to get a nice format. */ | |
2103 | ||
08f3b11b | 2104 | if (addr->host_list && tp && !tp->overrides_hosts) |
059ec3d9 PH |
2105 | { |
2106 | host_item *h; | |
2107 | int maxlen = 0; | |
2108 | int maxaddlen = 0; | |
08f3b11b JH |
2109 | for (h = addr->host_list; h; h = h->next) |
2110 | { /* get max lengths of host names, addrs */ | |
059ec3d9 PH |
2111 | int len = Ustrlen(h->name); |
2112 | if (len > maxlen) maxlen = len; | |
08f3b11b | 2113 | len = h->address ? Ustrlen(h->address) : 7; |
059ec3d9 PH |
2114 | if (len > maxaddlen) maxaddlen = len; |
2115 | } | |
08f3b11b JH |
2116 | for (h = addr->host_list; h; h = h->next) |
2117 | { | |
2118 | fprintf(f, " host %-*s ", maxlen, h->name); | |
2119 | ||
2120 | if (h->address) | |
2121 | fprintf(f, "[%s%-*c", h->address, maxaddlen+1 - Ustrlen(h->address), ']'); | |
2122 | else if (tp->info->local) | |
2123 | fprintf(f, " %-*s ", maxaddlen, ""); /* Omit [unknown] for local */ | |
2124 | else | |
2125 | fprintf(f, "[%s%-*c", "unknown", maxaddlen+1 - 7, ']'); | |
2126 | ||
2127 | if (h->mx >= 0) fprintf(f, " MX=%d", h->mx); | |
059ec3d9 | 2128 | if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port); |
08f3b11b JH |
2129 | if (running_in_test_harness && h->dnssec == DS_YES) fputs(" AD", f); |
2130 | if (h->status == hstatus_unusable) fputs(" ** unusable **", f); | |
2131 | fputc('\n', f); | |
059ec3d9 PH |
2132 | } |
2133 | } | |
2134 | } | |
059ec3d9 | 2135 | |
d9b2312b | 2136 | /* Yield will be DEFER or FAIL if any one address has, only for full_info (which is |
2c7db3f5 PH |
2137 | the -bv or -bt case). */ |
2138 | ||
d9b2312b | 2139 | out: |
ea90b718 | 2140 | verify_mode = NULL; |
35aba663 | 2141 | tls_modify_variables(&tls_in); |
d9b2312b | 2142 | |
8e669ac1 | 2143 | return yield; |
059ec3d9 PH |
2144 | } |
2145 | ||
2146 | ||
2147 | ||
2148 | ||
2149 | /************************************************* | |
2150 | * Check headers for syntax errors * | |
2151 | *************************************************/ | |
2152 | ||
2153 | /* This function checks those header lines that contain addresses, and verifies | |
2154 | that all the addresses therein are syntactially correct. | |
2155 | ||
2156 | Arguments: | |
2157 | msgptr where to put an error message | |
2158 | ||
2159 | Returns: OK | |
2160 | FAIL | |
2161 | */ | |
2162 | ||
2163 | int | |
2164 | verify_check_headers(uschar **msgptr) | |
2165 | { | |
2166 | header_line *h; | |
2167 | uschar *colon, *s; | |
1eccaa59 | 2168 | int yield = OK; |
059ec3d9 | 2169 | |
1eccaa59 | 2170 | for (h = header_list; h != NULL && yield == OK; h = h->next) |
059ec3d9 PH |
2171 | { |
2172 | if (h->type != htype_from && | |
2173 | h->type != htype_reply_to && | |
2174 | h->type != htype_sender && | |
2175 | h->type != htype_to && | |
2176 | h->type != htype_cc && | |
2177 | h->type != htype_bcc) | |
2178 | continue; | |
2179 | ||
2180 | colon = Ustrchr(h->text, ':'); | |
2181 | s = colon + 1; | |
2182 | while (isspace(*s)) s++; | |
2183 | ||
1eccaa59 PH |
2184 | /* Loop for multiple addresses in the header, enabling group syntax. Note |
2185 | that we have to reset this after the header has been scanned. */ | |
059ec3d9 | 2186 | |
1eccaa59 | 2187 | parse_allow_group = TRUE; |
059ec3d9 PH |
2188 | |
2189 | while (*s != 0) | |
2190 | { | |
2191 | uschar *ss = parse_find_address_end(s, FALSE); | |
2192 | uschar *recipient, *errmess; | |
2193 | int terminator = *ss; | |
2194 | int start, end, domain; | |
2195 | ||
2196 | /* Temporarily terminate the string at this point, and extract the | |
1eccaa59 | 2197 | operative address within, allowing group syntax. */ |
059ec3d9 PH |
2198 | |
2199 | *ss = 0; | |
2200 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
2201 | *ss = terminator; | |
2202 | ||
2203 | /* Permit an unqualified address only if the message is local, or if the | |
2204 | sending host is configured to be permitted to send them. */ | |
2205 | ||
2206 | if (recipient != NULL && domain == 0) | |
2207 | { | |
2208 | if (h->type == htype_from || h->type == htype_sender) | |
2209 | { | |
2210 | if (!allow_unqualified_sender) recipient = NULL; | |
2211 | } | |
2212 | else | |
2213 | { | |
2214 | if (!allow_unqualified_recipient) recipient = NULL; | |
2215 | } | |
2216 | if (recipient == NULL) errmess = US"unqualified address not permitted"; | |
2217 | } | |
2218 | ||
2219 | /* It's an error if no address could be extracted, except for the special | |
2220 | case of an empty address. */ | |
2221 | ||
2222 | if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0) | |
2223 | { | |
2224 | uschar *verb = US"is"; | |
2225 | uschar *t = ss; | |
1ab95fa6 | 2226 | uschar *tt = colon; |
059ec3d9 PH |
2227 | int len; |
2228 | ||
2229 | /* Arrange not to include any white space at the end in the | |
1ab95fa6 | 2230 | error message or the header name. */ |
059ec3d9 PH |
2231 | |
2232 | while (t > s && isspace(t[-1])) t--; | |
1ab95fa6 | 2233 | while (tt > h->text && isspace(tt[-1])) tt--; |
059ec3d9 | 2234 | |
1ab95fa6 | 2235 | /* Add the address that failed to the error message, since in a |
059ec3d9 PH |
2236 | header with very many addresses it is sometimes hard to spot |
2237 | which one is at fault. However, limit the amount of address to | |
2238 | quote - cases have been seen where, for example, a missing double | |
2239 | quote in a humungous To: header creates an "address" that is longer | |
2240 | than string_sprintf can handle. */ | |
2241 | ||
2242 | len = t - s; | |
2243 | if (len > 1024) | |
2244 | { | |
2245 | len = 1024; | |
2246 | verb = US"begins"; | |
2247 | } | |
2248 | ||
55414b25 JH |
2249 | /* deconst cast ok as we're passing a non-const to string_printing() */ |
2250 | *msgptr = US string_printing( | |
1ab95fa6 PH |
2251 | string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s", |
2252 | errmess, tt - h->text, h->text, verb, len, s)); | |
059ec3d9 | 2253 | |
1eccaa59 PH |
2254 | yield = FAIL; |
2255 | break; /* Out of address loop */ | |
059ec3d9 PH |
2256 | } |
2257 | ||
2258 | /* Advance to the next address */ | |
2259 | ||
2260 | s = ss + (terminator? 1:0); | |
2261 | while (isspace(*s)) s++; | |
2262 | } /* Next address */ | |
059ec3d9 | 2263 | |
1eccaa59 PH |
2264 | parse_allow_group = FALSE; |
2265 | parse_found_group = FALSE; | |
2266 | } /* Next header unless yield has been set FALSE */ | |
2267 | ||
2268 | return yield; | |
059ec3d9 PH |
2269 | } |
2270 | ||
2271 | ||
770747fd MFM |
2272 | /************************************************* |
2273 | * Check header names for 8-bit characters * | |
2274 | *************************************************/ | |
2275 | ||
4c04137d | 2276 | /* This function checks for invalid characters in header names. See |
770747fd MFM |
2277 | RFC 5322, 2.2. and RFC 6532, 3. |
2278 | ||
2279 | Arguments: | |
2280 | msgptr where to put an error message | |
2281 | ||
2282 | Returns: OK | |
2283 | FAIL | |
2284 | */ | |
2285 | ||
2286 | int | |
2287 | verify_check_header_names_ascii(uschar **msgptr) | |
2288 | { | |
2289 | header_line *h; | |
2290 | uschar *colon, *s; | |
2291 | ||
57cc2785 | 2292 | for (h = header_list; h; h = h->next) |
770747fd | 2293 | { |
57cc2785 JH |
2294 | colon = Ustrchr(h->text, ':'); |
2295 | for(s = h->text; s < colon; s++) | |
2296 | if ((*s < 33) || (*s > 126)) | |
2297 | { | |
2298 | *msgptr = string_sprintf("Invalid character in header \"%.*s\" found", | |
2299 | colon - h->text, h->text); | |
2300 | return FAIL; | |
2301 | } | |
770747fd MFM |
2302 | } |
2303 | return OK; | |
2304 | } | |
059ec3d9 | 2305 | |
1c41c9cc PH |
2306 | /************************************************* |
2307 | * Check for blind recipients * | |
2308 | *************************************************/ | |
2309 | ||
2310 | /* This function checks that every (envelope) recipient is mentioned in either | |
2311 | the To: or Cc: header lines, thus detecting blind carbon copies. | |
2312 | ||
2313 | There are two ways of scanning that could be used: either scan the header lines | |
2314 | and tick off the recipients, or scan the recipients and check the header lines. | |
2315 | The original proposed patch did the former, but I have chosen to do the latter, | |
2316 | because (a) it requires no memory and (b) will use fewer resources when there | |
2317 | are many addresses in To: and/or Cc: and only one or two envelope recipients. | |
2318 | ||
2319 | Arguments: none | |
2320 | Returns: OK if there are no blind recipients | |
2321 | FAIL if there is at least one blind recipient | |
2322 | */ | |
2323 | ||
2324 | int | |
2325 | verify_check_notblind(void) | |
2326 | { | |
2327 | int i; | |
2328 | for (i = 0; i < recipients_count; i++) | |
2329 | { | |
2330 | header_line *h; | |
2331 | BOOL found = FALSE; | |
2332 | uschar *address = recipients_list[i].address; | |
2333 | ||
2334 | for (h = header_list; !found && h != NULL; h = h->next) | |
2335 | { | |
2336 | uschar *colon, *s; | |
2337 | ||
2338 | if (h->type != htype_to && h->type != htype_cc) continue; | |
2339 | ||
2340 | colon = Ustrchr(h->text, ':'); | |
2341 | s = colon + 1; | |
2342 | while (isspace(*s)) s++; | |
2343 | ||
1eccaa59 PH |
2344 | /* Loop for multiple addresses in the header, enabling group syntax. Note |
2345 | that we have to reset this after the header has been scanned. */ | |
1c41c9cc | 2346 | |
1eccaa59 | 2347 | parse_allow_group = TRUE; |
1c41c9cc PH |
2348 | |
2349 | while (*s != 0) | |
2350 | { | |
2351 | uschar *ss = parse_find_address_end(s, FALSE); | |
2352 | uschar *recipient,*errmess; | |
2353 | int terminator = *ss; | |
2354 | int start, end, domain; | |
2355 | ||
2356 | /* Temporarily terminate the string at this point, and extract the | |
1eccaa59 | 2357 | operative address within, allowing group syntax. */ |
1c41c9cc PH |
2358 | |
2359 | *ss = 0; | |
2360 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
2361 | *ss = terminator; | |
2362 | ||
2363 | /* If we found a valid recipient that has a domain, compare it with the | |
2364 | envelope recipient. Local parts are compared case-sensitively, domains | |
2365 | case-insensitively. By comparing from the start with length "domain", we | |
2366 | include the "@" at the end, which ensures that we are comparing the whole | |
2367 | local part of each address. */ | |
2368 | ||
2369 | if (recipient != NULL && domain != 0) | |
2370 | { | |
2371 | found = Ustrncmp(recipient, address, domain) == 0 && | |
2372 | strcmpic(recipient + domain, address + domain) == 0; | |
2373 | if (found) break; | |
2374 | } | |
2375 | ||
2376 | /* Advance to the next address */ | |
2377 | ||
2378 | s = ss + (terminator? 1:0); | |
2379 | while (isspace(*s)) s++; | |
2380 | } /* Next address */ | |
1eccaa59 PH |
2381 | |
2382 | parse_allow_group = FALSE; | |
2383 | parse_found_group = FALSE; | |
1c41c9cc PH |
2384 | } /* Next header (if found is false) */ |
2385 | ||
2386 | if (!found) return FAIL; | |
2387 | } /* Next recipient */ | |
2388 | ||
2389 | return OK; | |
2390 | } | |
2391 | ||
2392 | ||
059ec3d9 PH |
2393 | |
2394 | /************************************************* | |
2395 | * Find if verified sender * | |
2396 | *************************************************/ | |
2397 | ||
2398 | /* Usually, just a single address is verified as the sender of the message. | |
2399 | However, Exim can be made to verify other addresses as well (often related in | |
2400 | some way), and this is useful in some environments. There may therefore be a | |
2401 | chain of such addresses that have previously been tested. This function finds | |
2402 | whether a given address is on the chain. | |
2403 | ||
2404 | Arguments: the address to be verified | |
2405 | Returns: pointer to an address item, or NULL | |
2406 | */ | |
2407 | ||
2408 | address_item * | |
2409 | verify_checked_sender(uschar *sender) | |
2410 | { | |
2411 | address_item *addr; | |
2412 | for (addr = sender_verified_list; addr != NULL; addr = addr->next) | |
2413 | if (Ustrcmp(sender, addr->address) == 0) break; | |
2414 | return addr; | |
2415 | } | |
2416 | ||
2417 | ||
2418 | ||
2419 | ||
2420 | ||
2421 | /************************************************* | |
2422 | * Get valid header address * | |
2423 | *************************************************/ | |
2424 | ||
2425 | /* Scan the originator headers of the message, looking for an address that | |
2426 | verifies successfully. RFC 822 says: | |
2427 | ||
2428 | o The "Sender" field mailbox should be sent notices of | |
2429 | any problems in transport or delivery of the original | |
2430 | messages. If there is no "Sender" field, then the | |
2431 | "From" field mailbox should be used. | |
2432 | ||
2433 | o If the "Reply-To" field exists, then the reply should | |
2434 | go to the addresses indicated in that field and not to | |
2435 | the address(es) indicated in the "From" field. | |
2436 | ||
2437 | So we check a Sender field if there is one, else a Reply_to field, else a From | |
2438 | field. As some strange messages may have more than one of these fields, | |
2439 | especially if they are resent- fields, check all of them if there is more than | |
2440 | one. | |
2441 | ||
2442 | Arguments: | |
2443 | user_msgptr points to where to put a user error message | |
2444 | log_msgptr points to where to put a log error message | |
2445 | callout timeout for callout check (passed to verify_address()) | |
2446 | callout_overall overall callout timeout (ditto) | |
8e669ac1 | 2447 | callout_connect connect callout timeout (ditto) |
059ec3d9 PH |
2448 | se_mailfrom mailfrom for verify; NULL => "" |
2449 | pm_mailfrom sender for pm callout check (passed to verify_address()) | |
2450 | options callout options (passed to verify_address()) | |
8e669ac1 | 2451 | verrno where to put the address basic_errno |
059ec3d9 PH |
2452 | |
2453 | If log_msgptr is set to something without setting user_msgptr, the caller | |
2454 | normally uses log_msgptr for both things. | |
2455 | ||
2456 | Returns: result of the verification attempt: OK, FAIL, or DEFER; | |
2457 | FAIL is given if no appropriate headers are found | |
2458 | */ | |
2459 | ||
2460 | int | |
2461 | verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr, | |
8e669ac1 | 2462 | int callout, int callout_overall, int callout_connect, uschar *se_mailfrom, |
fe5b5d0b | 2463 | uschar *pm_mailfrom, int options, int *verrno) |
059ec3d9 PH |
2464 | { |
2465 | static int header_types[] = { htype_sender, htype_reply_to, htype_from }; | |
1eccaa59 | 2466 | BOOL done = FALSE; |
059ec3d9 PH |
2467 | int yield = FAIL; |
2468 | int i; | |
2469 | ||
1eccaa59 | 2470 | for (i = 0; i < 3 && !done; i++) |
059ec3d9 PH |
2471 | { |
2472 | header_line *h; | |
1eccaa59 | 2473 | for (h = header_list; h != NULL && !done; h = h->next) |
059ec3d9 PH |
2474 | { |
2475 | int terminator, new_ok; | |
2476 | uschar *s, *ss, *endname; | |
2477 | ||
2478 | if (h->type != header_types[i]) continue; | |
2479 | s = endname = Ustrchr(h->text, ':') + 1; | |
2480 | ||
1eccaa59 PH |
2481 | /* Scan the addresses in the header, enabling group syntax. Note that we |
2482 | have to reset this after the header has been scanned. */ | |
2483 | ||
2484 | parse_allow_group = TRUE; | |
2485 | ||
059ec3d9 PH |
2486 | while (*s != 0) |
2487 | { | |
2488 | address_item *vaddr; | |
2489 | ||
2490 | while (isspace(*s) || *s == ',') s++; | |
2491 | if (*s == 0) break; /* End of header */ | |
2492 | ||
2493 | ss = parse_find_address_end(s, FALSE); | |
2494 | ||
2495 | /* The terminator is a comma or end of header, but there may be white | |
2496 | space preceding it (including newline for the last address). Move back | |
2497 | past any white space so we can check against any cached envelope sender | |
2498 | address verifications. */ | |
2499 | ||
2500 | while (isspace(ss[-1])) ss--; | |
2501 | terminator = *ss; | |
2502 | *ss = 0; | |
2503 | ||
2504 | HDEBUG(D_verify) debug_printf("verifying %.*s header address %s\n", | |
2505 | (int)(endname - h->text), h->text, s); | |
2506 | ||
2507 | /* See if we have already verified this address as an envelope sender, | |
2508 | and if so, use the previous answer. */ | |
2509 | ||
2510 | vaddr = verify_checked_sender(s); | |
2511 | ||
2512 | if (vaddr != NULL && /* Previously checked */ | |
2513 | (callout <= 0 || /* No callout needed; OR */ | |
2514 | vaddr->special_action > 256)) /* Callout was done */ | |
2515 | { | |
2516 | new_ok = vaddr->special_action & 255; | |
2517 | HDEBUG(D_verify) debug_printf("previously checked as envelope sender\n"); | |
2518 | *ss = terminator; /* Restore shortened string */ | |
2519 | } | |
2520 | ||
2521 | /* Otherwise we run the verification now. We must restore the shortened | |
2522 | string before running the verification, so the headers are correct, in | |
2523 | case there is any rewriting. */ | |
2524 | ||
2525 | else | |
2526 | { | |
2527 | int start, end, domain; | |
1eccaa59 PH |
2528 | uschar *address = parse_extract_address(s, log_msgptr, &start, &end, |
2529 | &domain, FALSE); | |
059ec3d9 PH |
2530 | |
2531 | *ss = terminator; | |
2532 | ||
1eccaa59 PH |
2533 | /* If we found an empty address, just carry on with the next one, but |
2534 | kill the message. */ | |
2535 | ||
2536 | if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0) | |
2537 | { | |
2538 | *log_msgptr = NULL; | |
2539 | s = ss; | |
2540 | continue; | |
2541 | } | |
2542 | ||
059ec3d9 PH |
2543 | /* If verification failed because of a syntax error, fail this |
2544 | function, and ensure that the failing address gets added to the error | |
2545 | message. */ | |
2546 | ||
2547 | if (address == NULL) | |
2548 | { | |
2549 | new_ok = FAIL; | |
1eccaa59 PH |
2550 | while (ss > s && isspace(ss[-1])) ss--; |
2551 | *log_msgptr = string_sprintf("syntax error in '%.*s' header when " | |
2552 | "scanning for sender: %s in \"%.*s\"", | |
2553 | endname - h->text, h->text, *log_msgptr, ss - s, s); | |
2554 | yield = FAIL; | |
2555 | done = TRUE; | |
2556 | break; | |
059ec3d9 PH |
2557 | } |
2558 | ||
2f6603e1 | 2559 | /* Else go ahead with the sender verification. But it isn't *the* |
059ec3d9 PH |
2560 | sender of the message, so set vopt_fake_sender to stop sender_address |
2561 | being replaced after rewriting or qualification. */ | |
2562 | ||
2563 | else | |
2564 | { | |
2565 | vaddr = deliver_make_addr(address, FALSE); | |
2566 | new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender, | |
8e669ac1 | 2567 | callout, callout_overall, callout_connect, se_mailfrom, |
4deaf07d | 2568 | pm_mailfrom, NULL); |
059ec3d9 PH |
2569 | } |
2570 | } | |
2571 | ||
2572 | /* We now have the result, either newly found, or cached. If we are | |
2573 | giving out error details, set a specific user error. This means that the | |
2574 | last of these will be returned to the user if all three fail. We do not | |
2575 | set a log message - the generic one below will be used. */ | |
2576 | ||
fe5b5d0b | 2577 | if (new_ok != OK) |
059ec3d9 | 2578 | { |
8e669ac1 | 2579 | *verrno = vaddr->basic_errno; |
fe5b5d0b PH |
2580 | if (smtp_return_error_details) |
2581 | { | |
2582 | *user_msgptr = string_sprintf("Rejected after DATA: " | |
2583 | "could not verify \"%.*s\" header address\n%s: %s", | |
2584 | endname - h->text, h->text, vaddr->address, vaddr->message); | |
2585 | } | |
8e669ac1 | 2586 | } |
059ec3d9 PH |
2587 | |
2588 | /* Success or defer */ | |
2589 | ||
1eccaa59 PH |
2590 | if (new_ok == OK) |
2591 | { | |
2592 | yield = OK; | |
2593 | done = TRUE; | |
2594 | break; | |
2595 | } | |
2596 | ||
059ec3d9 PH |
2597 | if (new_ok == DEFER) yield = DEFER; |
2598 | ||
2599 | /* Move on to any more addresses in the header */ | |
2600 | ||
2601 | s = ss; | |
1eccaa59 PH |
2602 | } /* Next address */ |
2603 | ||
2604 | parse_allow_group = FALSE; | |
2605 | parse_found_group = FALSE; | |
2606 | } /* Next header, unless done */ | |
2607 | } /* Next header type unless done */ | |
059ec3d9 PH |
2608 | |
2609 | if (yield == FAIL && *log_msgptr == NULL) | |
2610 | *log_msgptr = US"there is no valid sender in any header line"; | |
2611 | ||
2612 | if (yield == DEFER && *log_msgptr == NULL) | |
2613 | *log_msgptr = US"all attempts to verify a sender in a header line deferred"; | |
2614 | ||
2615 | return yield; | |
2616 | } | |
2617 | ||
2618 | ||
2619 | ||
2620 | ||
2621 | /************************************************* | |
2622 | * Get RFC 1413 identification * | |
2623 | *************************************************/ | |
2624 | ||
2625 | /* Attempt to get an id from the sending machine via the RFC 1413 protocol. If | |
2626 | the timeout is set to zero, then the query is not done. There may also be lists | |
2627 | of hosts and nets which are exempt. To guard against malefactors sending | |
2628 | non-printing characters which could, for example, disrupt a message's headers, | |
2629 | make sure the string consists of printing characters only. | |
2630 | ||
2631 | Argument: | |
2632 | port the port to connect to; usually this is IDENT_PORT (113), but when | |
2633 | running in the test harness with -bh a different value is used. | |
2634 | ||
2635 | Returns: nothing | |
2636 | ||
2637 | Side effect: any received ident value is put in sender_ident (NULL otherwise) | |
2638 | */ | |
2639 | ||
2640 | void | |
2641 | verify_get_ident(int port) | |
2642 | { | |
2643 | int sock, host_af, qlen; | |
2644 | int received_sender_port, received_interface_port, n; | |
2645 | uschar *p; | |
2646 | uschar buffer[2048]; | |
2647 | ||
2648 | /* Default is no ident. Check whether we want to do an ident check for this | |
2649 | host. */ | |
2650 | ||
2651 | sender_ident = NULL; | |
2652 | if (rfc1413_query_timeout <= 0 || verify_check_host(&rfc1413_hosts) != OK) | |
2653 | return; | |
2654 | ||
2655 | DEBUG(D_ident) debug_printf("doing ident callback\n"); | |
2656 | ||
2657 | /* Set up a connection to the ident port of the remote host. Bind the local end | |
2658 | to the incoming interface address. If the sender host address is an IPv6 | |
2659 | address, the incoming interface address will also be IPv6. */ | |
2660 | ||
fb05276a JH |
2661 | host_af = Ustrchr(sender_host_address, ':') == NULL ? AF_INET : AF_INET6; |
2662 | if ((sock = ip_socket(SOCK_STREAM, host_af)) < 0) return; | |
059ec3d9 PH |
2663 | |
2664 | if (ip_bind(sock, host_af, interface_address, 0) < 0) | |
2665 | { | |
2666 | DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n", | |
2667 | strerror(errno)); | |
2668 | goto END_OFF; | |
2669 | } | |
2670 | ||
fb05276a JH |
2671 | if (ip_connect(sock, host_af, sender_host_address, port, |
2672 | rfc1413_query_timeout, TRUE) < 0) | |
059ec3d9 | 2673 | { |
6c6d6e48 | 2674 | if (errno == ETIMEDOUT && LOGGING(ident_timeout)) |
059ec3d9 PH |
2675 | log_write(0, LOG_MAIN, "ident connection to %s timed out", |
2676 | sender_host_address); | |
059ec3d9 | 2677 | else |
059ec3d9 PH |
2678 | DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n", |
2679 | sender_host_address, strerror(errno)); | |
059ec3d9 PH |
2680 | goto END_OFF; |
2681 | } | |
2682 | ||
2683 | /* Construct and send the query. */ | |
2684 | ||
2685 | sprintf(CS buffer, "%d , %d\r\n", sender_host_port, interface_port); | |
2686 | qlen = Ustrlen(buffer); | |
2687 | if (send(sock, buffer, qlen, 0) < 0) | |
2688 | { | |
2689 | DEBUG(D_ident) debug_printf("ident send failed: %s\n", strerror(errno)); | |
2690 | goto END_OFF; | |
2691 | } | |
2692 | ||
2693 | /* Read a response line. We put it into the rest of the buffer, using several | |
2694 | recv() calls if necessary. */ | |
2695 | ||
2696 | p = buffer + qlen; | |
2697 | ||
2698 | for (;;) | |
2699 | { | |
2700 | uschar *pp; | |
2701 | int count; | |
2702 | int size = sizeof(buffer) - (p - buffer); | |
2703 | ||
2704 | if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */ | |
2705 | count = ip_recv(sock, p, size, rfc1413_query_timeout); | |
2706 | if (count <= 0) goto END_OFF; /* Read error or EOF */ | |
2707 | ||
2708 | /* Scan what we just read, to see if we have reached the terminating \r\n. Be | |
2709 | generous, and accept a plain \n terminator as well. The only illegal | |
2710 | character is 0. */ | |
2711 | ||
2712 | for (pp = p; pp < p + count; pp++) | |
2713 | { | |
2714 | if (*pp == 0) goto END_OFF; /* Zero octet not allowed */ | |
2715 | if (*pp == '\n') | |
2716 | { | |
2717 | if (pp[-1] == '\r') pp--; | |
2718 | *pp = 0; | |
2719 | goto GOT_DATA; /* Break out of both loops */ | |
2720 | } | |
2721 | } | |
2722 | ||
2723 | /* Reached the end of the data without finding \n. Let the loop continue to | |
2724 | read some more, if there is room. */ | |
2725 | ||
2726 | p = pp; | |
2727 | } | |
2728 | ||
2729 | GOT_DATA: | |
2730 | ||
2731 | /* We have received a line of data. Check it carefully. It must start with the | |
2732 | same two port numbers that we sent, followed by data as defined by the RFC. For | |
2733 | example, | |
2734 | ||
2735 | 12345 , 25 : USERID : UNIX :root | |
2736 | ||
2737 | However, the amount of white space may be different to what we sent. In the | |
2738 | "osname" field there may be several sub-fields, comma separated. The data we | |
2739 | actually want to save follows the third colon. Some systems put leading spaces | |
2740 | in it - we discard those. */ | |
2741 | ||
2742 | if (sscanf(CS buffer + qlen, "%d , %d%n", &received_sender_port, | |
2743 | &received_interface_port, &n) != 2 || | |
2744 | received_sender_port != sender_host_port || | |
2745 | received_interface_port != interface_port) | |
2746 | goto END_OFF; | |
2747 | ||
2748 | p = buffer + qlen + n; | |
2749 | while(isspace(*p)) p++; | |
2750 | if (*p++ != ':') goto END_OFF; | |
2751 | while(isspace(*p)) p++; | |
2752 | if (Ustrncmp(p, "USERID", 6) != 0) goto END_OFF; | |
2753 | p += 6; | |
2754 | while(isspace(*p)) p++; | |
2755 | if (*p++ != ':') goto END_OFF; | |
2756 | while (*p != 0 && *p != ':') p++; | |
2757 | if (*p++ == 0) goto END_OFF; | |
2758 | while(isspace(*p)) p++; | |
2759 | if (*p == 0) goto END_OFF; | |
2760 | ||
2761 | /* The rest of the line is the data we want. We turn it into printing | |
2762 | characters when we save it, so that it cannot mess up the format of any logging | |
2763 | or Received: lines into which it gets inserted. We keep a maximum of 127 | |
55414b25 | 2764 | characters. The deconst cast is ok as we fed a nonconst to string_printing() */ |
059ec3d9 | 2765 | |
55414b25 | 2766 | sender_ident = US string_printing(string_copyn(p, 127)); |
059ec3d9 PH |
2767 | DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident); |
2768 | ||
2769 | END_OFF: | |
f1e894f3 | 2770 | (void)close(sock); |
059ec3d9 PH |
2771 | return; |
2772 | } | |
2773 | ||
2774 | ||
2775 | ||
2776 | ||
2777 | /************************************************* | |
2778 | * Match host to a single host-list item * | |
2779 | *************************************************/ | |
2780 | ||
2781 | /* This function compares a host (name or address) against a single item | |
2782 | from a host list. The host name gets looked up if it is needed and is not | |
2783 | already known. The function is called from verify_check_this_host() via | |
2784 | match_check_list(), which is why most of its arguments are in a single block. | |
2785 | ||
2786 | Arguments: | |
2787 | arg the argument block (see below) | |
2788 | ss the host-list item | |
2789 | valueptr where to pass back looked up data, or NULL | |
2790 | error for error message when returning ERROR | |
2791 | ||
2792 | The block contains: | |
32d668a5 PH |
2793 | host_name (a) the host name, or |
2794 | (b) NULL, implying use sender_host_name and | |
2795 | sender_host_aliases, looking them up if required, or | |
2796 | (c) the empty string, meaning that only IP address matches | |
2797 | are permitted | |
059ec3d9 PH |
2798 | host_address the host address |
2799 | host_ipv4 the IPv4 address taken from an IPv6 one | |
2800 | ||
2801 | Returns: OK matched | |
2802 | FAIL did not match | |
2803 | DEFER lookup deferred | |
32d668a5 PH |
2804 | ERROR (a) failed to find the host name or IP address, or |
2805 | (b) unknown lookup type specified, or | |
2806 | (c) host name encountered when only IP addresses are | |
2807 | being matched | |
059ec3d9 PH |
2808 | */ |
2809 | ||
32d668a5 | 2810 | int |
55414b25 | 2811 | check_host(void *arg, const uschar *ss, const uschar **valueptr, uschar **error) |
059ec3d9 PH |
2812 | { |
2813 | check_host_block *cb = (check_host_block *)arg; | |
32d668a5 | 2814 | int mlen = -1; |
059ec3d9 | 2815 | int maskoffset; |
32d668a5 | 2816 | BOOL iplookup = FALSE; |
059ec3d9 | 2817 | BOOL isquery = FALSE; |
32d668a5 | 2818 | BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0; |
55414b25 | 2819 | const uschar *t; |
32d668a5 | 2820 | uschar *semicolon; |
059ec3d9 PH |
2821 | uschar **aliases; |
2822 | ||
2823 | /* Optimize for the special case when the pattern is "*". */ | |
2824 | ||
2825 | if (*ss == '*' && ss[1] == 0) return OK; | |
2826 | ||
2827 | /* If the pattern is empty, it matches only in the case when there is no host - | |
2828 | this can occur in ACL checking for SMTP input using the -bs option. In this | |
2829 | situation, the host address is the empty string. */ | |
2830 | ||
2831 | if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL; | |
2832 | if (*ss == 0) return FAIL; | |
2833 | ||
32d668a5 PH |
2834 | /* If the pattern is precisely "@" then match against the primary host name, |
2835 | provided that host name matching is permitted; if it's "@[]" match against the | |
2836 | local host's IP addresses. */ | |
059ec3d9 PH |
2837 | |
2838 | if (*ss == '@') | |
2839 | { | |
32d668a5 PH |
2840 | if (ss[1] == 0) |
2841 | { | |
2842 | if (isiponly) return ERROR; | |
2843 | ss = primary_hostname; | |
2844 | } | |
059ec3d9 PH |
2845 | else if (Ustrcmp(ss, "@[]") == 0) |
2846 | { | |
2847 | ip_address_item *ip; | |
2848 | for (ip = host_find_interfaces(); ip != NULL; ip = ip->next) | |
2849 | if (Ustrcmp(ip->address, cb->host_address) == 0) return OK; | |
2850 | return FAIL; | |
2851 | } | |
2852 | } | |
2853 | ||
2854 | /* If the pattern is an IP address, optionally followed by a bitmask count, do | |
4c04137d | 2855 | a (possibly masked) comparison with the current IP address. */ |
059ec3d9 | 2856 | |
7e66e54d | 2857 | if (string_is_ip_address(ss, &maskoffset) != 0) |
059ec3d9 PH |
2858 | return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL); |
2859 | ||
1688f43b PH |
2860 | /* The pattern is not an IP address. A common error that people make is to omit |
2861 | one component of an IPv4 address, either by accident, or believing that, for | |
2862 | 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, | |
2863 | which it isn't. (Those applications that do accept 1.2.3 as an IP address | |
2864 | interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an | |
2865 | ancient specification.) To aid in debugging these cases, we give a specific | |
2866 | error if the pattern contains only digits and dots or contains a slash preceded | |
2867 | only by digits and dots (a slash at the start indicates a file name and of | |
2868 | course slashes may be present in lookups, but not preceded only by digits and | |
2869 | dots). */ | |
2870 | ||
2871 | for (t = ss; isdigit(*t) || *t == '.'; t++); | |
2872 | if (*t == 0 || (*t == '/' && t != ss)) | |
2873 | { | |
2874 | *error = US"malformed IPv4 address or address mask"; | |
2875 | return ERROR; | |
2876 | } | |
2877 | ||
32d668a5 | 2878 | /* See if there is a semicolon in the pattern */ |
059ec3d9 | 2879 | |
32d668a5 PH |
2880 | semicolon = Ustrchr(ss, ';'); |
2881 | ||
2882 | /* If we are doing an IP address only match, then all lookups must be IP | |
df199fec | 2883 | address lookups, even if there is no "net-". */ |
32d668a5 PH |
2884 | |
2885 | if (isiponly) | |
059ec3d9 | 2886 | { |
32d668a5 PH |
2887 | iplookup = semicolon != NULL; |
2888 | } | |
059ec3d9 | 2889 | |
32d668a5 | 2890 | /* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is |
df199fec PH |
2891 | a lookup on a masked IP network, in textual form. We obey this code even if we |
2892 | have already set iplookup, so as to skip over the "net-" prefix and to set the | |
2893 | mask length. The net- stuff really only applies to single-key lookups where the | |
2894 | key is implicit. For query-style lookups the key is specified in the query. | |
2895 | From release 4.30, the use of net- for query style is no longer needed, but we | |
2896 | retain it for backward compatibility. */ | |
2897 | ||
2898 | if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL) | |
32d668a5 PH |
2899 | { |
2900 | mlen = 0; | |
2901 | for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0'; | |
2902 | if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */ | |
2903 | iplookup = (*t++ == '-'); | |
2904 | } | |
1688f43b | 2905 | else t = ss; |
059ec3d9 | 2906 | |
32d668a5 | 2907 | /* Do the IP address lookup if that is indeed what we have */ |
059ec3d9 | 2908 | |
32d668a5 PH |
2909 | if (iplookup) |
2910 | { | |
2911 | int insize; | |
2912 | int search_type; | |
2913 | int incoming[4]; | |
2914 | void *handle; | |
2915 | uschar *filename, *key, *result; | |
2916 | uschar buffer[64]; | |
059ec3d9 | 2917 | |
32d668a5 | 2918 | /* Find the search type */ |
059ec3d9 | 2919 | |
32d668a5 | 2920 | search_type = search_findtype(t, semicolon - t); |
059ec3d9 | 2921 | |
32d668a5 PH |
2922 | if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", |
2923 | search_error_message); | |
059ec3d9 | 2924 | |
13b685f9 PH |
2925 | /* Adjust parameters for the type of lookup. For a query-style lookup, there |
2926 | is no file name, and the "key" is just the query. For query-style with a file | |
2927 | name, we have to fish the file off the start of the query. For a single-key | |
2928 | lookup, the key is the current IP address, masked appropriately, and | |
2929 | reconverted to text form, with the mask appended. For IPv6 addresses, specify | |
6a3bceb1 PH |
2930 | dot separators instead of colons, except when the lookup type is "iplsearch". |
2931 | */ | |
059ec3d9 | 2932 | |
13b685f9 PH |
2933 | if (mac_islookup(search_type, lookup_absfilequery)) |
2934 | { | |
2935 | filename = semicolon + 1; | |
2936 | key = filename; | |
2937 | while (*key != 0 && !isspace(*key)) key++; | |
2938 | filename = string_copyn(filename, key - filename); | |
2939 | while (isspace(*key)) key++; | |
2940 | } | |
2941 | else if (mac_islookup(search_type, lookup_querystyle)) | |
32d668a5 PH |
2942 | { |
2943 | filename = NULL; | |
2944 | key = semicolon + 1; | |
2945 | } | |
6a3bceb1 | 2946 | else /* Single-key style */ |
32d668a5 | 2947 | { |
e6d225ae | 2948 | int sep = (Ustrcmp(lookup_list[search_type]->name, "iplsearch") == 0)? |
6a3bceb1 | 2949 | ':' : '.'; |
32d668a5 PH |
2950 | insize = host_aton(cb->host_address, incoming); |
2951 | host_mask(insize, incoming, mlen); | |
6a3bceb1 | 2952 | (void)host_nmtoa(insize, incoming, mlen, buffer, sep); |
32d668a5 PH |
2953 | key = buffer; |
2954 | filename = semicolon + 1; | |
059ec3d9 | 2955 | } |
32d668a5 PH |
2956 | |
2957 | /* Now do the actual lookup; note that there is no search_close() because | |
2958 | of the caching arrangements. */ | |
2959 | ||
d4ff61d1 JH |
2960 | if (!(handle = search_open(filename, search_type, 0, NULL, NULL))) |
2961 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", search_error_message); | |
2962 | ||
32d668a5 PH |
2963 | result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL); |
2964 | if (valueptr != NULL) *valueptr = result; | |
2965 | return (result != NULL)? OK : search_find_defer? DEFER: FAIL; | |
059ec3d9 PH |
2966 | } |
2967 | ||
2968 | /* The pattern is not an IP address or network reference of any kind. That is, | |
32d668a5 PH |
2969 | it is a host name pattern. If this is an IP only match, there's an error in the |
2970 | host list. */ | |
2971 | ||
2972 | if (isiponly) | |
2973 | { | |
2974 | *error = US"cannot match host name in match_ip list"; | |
2975 | return ERROR; | |
2976 | } | |
2977 | ||
2978 | /* Check the characters of the pattern to see if they comprise only letters, | |
2979 | digits, full stops, and hyphens (the constituents of domain names). Allow | |
2980 | underscores, as they are all too commonly found. Sigh. Also, if | |
2981 | allow_utf8_domains is set, allow top-bit characters. */ | |
059ec3d9 PH |
2982 | |
2983 | for (t = ss; *t != 0; t++) | |
2984 | if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' && | |
2985 | (!allow_utf8_domains || *t < 128)) break; | |
2986 | ||
2987 | /* If the pattern is a complete domain name, with no fancy characters, look up | |
2988 | its IP address and match against that. Note that a multi-homed host will add | |
2989 | items to the chain. */ | |
2990 | ||
2991 | if (*t == 0) | |
2992 | { | |
2993 | int rc; | |
2994 | host_item h; | |
2995 | h.next = NULL; | |
2996 | h.name = ss; | |
2997 | h.address = NULL; | |
2998 | h.mx = MX_NONE; | |
9b8fadde | 2999 | |
1f155f8e JH |
3000 | /* Using byname rather than bydns here means we cannot determine dnssec |
3001 | status. On the other hand it is unclear how that could be either | |
3002 | propagated up or enforced. */ | |
3003 | ||
322050c2 | 3004 | rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE); |
059ec3d9 PH |
3005 | if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL) |
3006 | { | |
3007 | host_item *hh; | |
3008 | for (hh = &h; hh != NULL; hh = hh->next) | |
3009 | { | |
96776534 | 3010 | if (host_is_in_net(hh->address, cb->host_address, 0)) return OK; |
059ec3d9 PH |
3011 | } |
3012 | return FAIL; | |
3013 | } | |
3014 | if (rc == HOST_FIND_AGAIN) return DEFER; | |
3015 | *error = string_sprintf("failed to find IP address for %s", ss); | |
3016 | return ERROR; | |
3017 | } | |
3018 | ||
3019 | /* Almost all subsequent comparisons require the host name, and can be done | |
3020 | using the general string matching function. When this function is called for | |
3021 | outgoing hosts, the name is always given explicitly. If it is NULL, it means we | |
3022 | must use sender_host_name and its aliases, looking them up if necessary. */ | |
3023 | ||
3024 | if (cb->host_name != NULL) /* Explicit host name given */ | |
3025 | return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE, | |
3026 | valueptr); | |
3027 | ||
3028 | /* Host name not given; in principle we need the sender host name and its | |
3029 | aliases. However, for query-style lookups, we do not need the name if the | |
3030 | query does not contain $sender_host_name. From release 4.23, a reference to | |
3031 | $sender_host_name causes it to be looked up, so we don't need to do the lookup | |
3032 | on spec. */ | |
3033 | ||
3034 | if ((semicolon = Ustrchr(ss, ';')) != NULL) | |
3035 | { | |
55414b25 | 3036 | const uschar *affix; |
059ec3d9 PH |
3037 | int partial, affixlen, starflags, id; |
3038 | ||
3039 | *semicolon = 0; | |
3040 | id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags); | |
3041 | *semicolon=';'; | |
3042 | ||
3043 | if (id < 0) /* Unknown lookup type */ | |
3044 | { | |
3045 | log_write(0, LOG_MAIN|LOG_PANIC, "%s in host list item \"%s\"", | |
3046 | search_error_message, ss); | |
3047 | return DEFER; | |
3048 | } | |
13b685f9 | 3049 | isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery); |
059ec3d9 PH |
3050 | } |
3051 | ||
3052 | if (isquery) | |
3053 | { | |
3054 | switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr)) | |
3055 | { | |
3056 | case OK: return OK; | |
3057 | case DEFER: return DEFER; | |
3058 | default: return FAIL; | |
3059 | } | |
3060 | } | |
3061 | ||
3062 | /* Not a query-style lookup; must ensure the host name is present, and then we | |
3063 | do a check on the name and all its aliases. */ | |
3064 | ||
3065 | if (sender_host_name == NULL) | |
3066 | { | |
3067 | HDEBUG(D_host_lookup) | |
3068 | debug_printf("sender host name required, to match against %s\n", ss); | |
3069 | if (host_lookup_failed || host_name_lookup() != OK) | |
3070 | { | |
3071 | *error = string_sprintf("failed to find host name for %s", | |
3072 | sender_host_address);; | |
3073 | return ERROR; | |
3074 | } | |
3075 | host_build_sender_fullhost(); | |
3076 | } | |
3077 | ||
3078 | /* Match on the sender host name, using the general matching function */ | |
3079 | ||
3080 | switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE, | |
3081 | valueptr)) | |
3082 | { | |
3083 | case OK: return OK; | |
3084 | case DEFER: return DEFER; | |
3085 | } | |
3086 | ||
3087 | /* If there are aliases, try matching on them. */ | |
3088 | ||
3089 | aliases = sender_host_aliases; | |
3090 | while (*aliases != NULL) | |
3091 | { | |
3092 | switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr)) | |
3093 | { | |
3094 | case OK: return OK; | |
3095 | case DEFER: return DEFER; | |
3096 | } | |
3097 | } | |
3098 | return FAIL; | |
3099 | } | |
3100 | ||
3101 | ||
3102 | ||
3103 | ||
3104 | /************************************************* | |
3105 | * Check a specific host matches a host list * | |
3106 | *************************************************/ | |
3107 | ||
3108 | /* This function is passed a host list containing items in a number of | |
3109 | different formats and the identity of a host. Its job is to determine whether | |
3110 | the given host is in the set of hosts defined by the list. The host name is | |
3111 | passed as a pointer so that it can be looked up if needed and not already | |
3112 | known. This is commonly the case when called from verify_check_host() to check | |
3113 | an incoming connection. When called from elsewhere the host name should usually | |
3114 | be set. | |
3115 | ||
3116 | This function is now just a front end to match_check_list(), which runs common | |
3117 | code for scanning a list. We pass it the check_host() function to perform a | |
3118 | single test. | |
3119 | ||
3120 | Arguments: | |
3121 | listptr pointer to the host list | |
3122 | cache_bits pointer to cache for named lists, or NULL | |
3123 | host_name the host name or NULL, implying use sender_host_name and | |
3124 | sender_host_aliases, looking them up if required | |
3125 | host_address the IP address | |
3126 | valueptr if not NULL, data from a lookup is passed back here | |
3127 | ||
3128 | Returns: OK if the host is in the defined set | |
3129 | FAIL if the host is not in the defined set, | |
3130 | DEFER if a data lookup deferred (not a host lookup) | |
3131 | ||
3132 | If the host name was needed in order to make a comparison, and could not be | |
3133 | determined from the IP address, the result is FAIL unless the item | |
3134 | "+allow_unknown" was met earlier in the list, in which case OK is returned. */ | |
3135 | ||
3136 | int | |
55414b25 JH |
3137 | verify_check_this_host(const uschar **listptr, unsigned int *cache_bits, |
3138 | const uschar *host_name, const uschar *host_address, const uschar **valueptr) | |
059ec3d9 | 3139 | { |
d4eb88df | 3140 | int rc; |
059ec3d9 | 3141 | unsigned int *local_cache_bits = cache_bits; |
55414b25 | 3142 | const uschar *save_host_address = deliver_host_address; |
059ec3d9 PH |
3143 | check_host_block cb; |
3144 | cb.host_name = host_name; | |
3145 | cb.host_address = host_address; | |
3146 | ||
3147 | if (valueptr != NULL) *valueptr = NULL; | |
3148 | ||
3149 | /* If the host address starts off ::ffff: it is an IPv6 address in | |
3150 | IPv4-compatible mode. Find the IPv4 part for checking against IPv4 | |
3151 | addresses. */ | |
3152 | ||
3153 | cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)? | |
3154 | host_address + 7 : host_address; | |
3155 | ||
8e669ac1 PH |
3156 | /* During the running of the check, put the IP address into $host_address. In |
3157 | the case of calls from the smtp transport, it will already be there. However, | |
3158 | in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on | |
d4eb88df PH |
3159 | the safe side, any existing setting is preserved, though as I write this |
3160 | (November 2004) I can't see any cases where it is actually needed. */ | |
3161 | ||
3162 | deliver_host_address = host_address; | |
3163 | rc = match_check_list( | |
3164 | listptr, /* the list */ | |
3165 | 0, /* separator character */ | |
3166 | &hostlist_anchor, /* anchor pointer */ | |
3167 | &local_cache_bits, /* cache pointer */ | |
3168 | check_host, /* function for testing */ | |
3169 | &cb, /* argument for function */ | |
3170 | MCL_HOST, /* type of check */ | |
8e669ac1 | 3171 | (host_address == sender_host_address)? |
d4eb88df PH |
3172 | US"host" : host_address, /* text for debugging */ |
3173 | valueptr); /* where to pass back data */ | |
3174 | deliver_host_address = save_host_address; | |
8e669ac1 | 3175 | return rc; |
059ec3d9 PH |
3176 | } |
3177 | ||
3178 | ||
3179 | ||
3180 | ||
5130845b JH |
3181 | /************************************************* |
3182 | * Check the given host item matches a list * | |
3183 | *************************************************/ | |
3184 | int | |
3185 | verify_check_given_host(uschar **listptr, host_item *host) | |
3186 | { | |
55414b25 | 3187 | return verify_check_this_host(CUSS listptr, NULL, host->name, host->address, NULL); |
5130845b JH |
3188 | } |
3189 | ||
059ec3d9 PH |
3190 | /************************************************* |
3191 | * Check the remote host matches a list * | |
3192 | *************************************************/ | |
3193 | ||
3194 | /* This is a front end to verify_check_this_host(), created because checking | |
3195 | the remote host is a common occurrence. With luck, a good compiler will spot | |
3196 | the tail recursion and optimize it. If there's no host address, this is | |
3197 | command-line SMTP input - check against an empty string for the address. | |
3198 | ||
3199 | Arguments: | |
3200 | listptr pointer to the host list | |
3201 | ||
3202 | Returns: the yield of verify_check_this_host(), | |
3203 | i.e. OK, FAIL, or DEFER | |
3204 | */ | |
3205 | ||
3206 | int | |
3207 | verify_check_host(uschar **listptr) | |
3208 | { | |
55414b25 | 3209 | return verify_check_this_host(CUSS listptr, sender_host_cache, NULL, |
059ec3d9 PH |
3210 | (sender_host_address == NULL)? US"" : sender_host_address, NULL); |
3211 | } | |
3212 | ||
3213 | ||
3214 | ||
3215 | ||
3216 | ||
3217 | /************************************************* | |
83e029d5 | 3218 | * Invert an IP address * |
059ec3d9 PH |
3219 | *************************************************/ |
3220 | ||
83e029d5 PP |
3221 | /* Originally just used for DNS xBL lists, now also used for the |
3222 | reverse_ip expansion operator. | |
3223 | ||
059ec3d9 PH |
3224 | Arguments: |
3225 | buffer where to put the answer | |
3226 | address the address to invert | |
3227 | */ | |
3228 | ||
83e029d5 | 3229 | void |
059ec3d9 PH |
3230 | invert_address(uschar *buffer, uschar *address) |
3231 | { | |
3232 | int bin[4]; | |
3233 | uschar *bptr = buffer; | |
3234 | ||
3235 | /* If this is an IPv4 address mapped into IPv6 format, adjust the pointer | |
3236 | to the IPv4 part only. */ | |
3237 | ||
3238 | if (Ustrncmp(address, "::ffff:", 7) == 0) address += 7; | |
3239 | ||
3240 | /* Handle IPv4 address: when HAVE_IPV6 is false, the result of host_aton() is | |
3241 | always 1. */ | |
3242 | ||
3243 | if (host_aton(address, bin) == 1) | |
3244 | { | |
3245 | int i; | |
3246 | int x = bin[0]; | |
3247 | for (i = 0; i < 4; i++) | |
3248 | { | |
3249 | sprintf(CS bptr, "%d.", x & 255); | |
3250 | while (*bptr) bptr++; | |
3251 | x >>= 8; | |
3252 | } | |
3253 | } | |
3254 | ||
3255 | /* Handle IPv6 address. Actually, as far as I know, there are no IPv6 addresses | |
3256 | in any DNS black lists, and the format in which they will be looked up is | |
3257 | unknown. This is just a guess. */ | |
3258 | ||
3259 | #if HAVE_IPV6 | |
3260 | else | |
3261 | { | |
3262 | int i, j; | |
3263 | for (j = 3; j >= 0; j--) | |
3264 | { | |
3265 | int x = bin[j]; | |
3266 | for (i = 0; i < 8; i++) | |
3267 | { | |
3268 | sprintf(CS bptr, "%x.", x & 15); | |
3269 | while (*bptr) bptr++; | |
3270 | x >>= 4; | |
3271 | } | |
3272 | } | |
3273 | } | |
3274 | #endif | |
d6f6e0dc PH |
3275 | |
3276 | /* Remove trailing period -- this is needed so that both arbitrary | |
3277 | dnsbl keydomains and inverted addresses may be combined with the | |
3278 | same format string, "%s.%s" */ | |
3279 | ||
3280 | *(--bptr) = 0; | |
059ec3d9 PH |
3281 | } |
3282 | ||
3283 | ||
3284 | ||
0bcb2a0e PH |
3285 | /************************************************* |
3286 | * Perform a single dnsbl lookup * | |
3287 | *************************************************/ | |
3288 | ||
d6f6e0dc PH |
3289 | /* This function is called from verify_check_dnsbl() below. It is also called |
3290 | recursively from within itself when domain and domain_txt are different | |
3291 | pointers, in order to get the TXT record from the alternate domain. | |
0bcb2a0e PH |
3292 | |
3293 | Arguments: | |
d6f6e0dc PH |
3294 | domain the outer dnsbl domain |
3295 | domain_txt alternate domain to lookup TXT record on success; when the | |
3296 | same domain is to be used, domain_txt == domain (that is, | |
3297 | the pointers must be identical, not just the text) | |
8e669ac1 | 3298 | keydomain the current keydomain (for debug message) |
d6f6e0dc PH |
3299 | prepend subdomain to lookup (like keydomain, but |
3300 | reversed if IP address) | |
3301 | iplist the list of matching IP addresses, or NULL for "any" | |
8e669ac1 | 3302 | bitmask true if bitmask matching is wanted |
431b7361 PH |
3303 | match_type condition for 'succeed' result |
3304 | 0 => Any RR in iplist (=) | |
3305 | 1 => No RR in iplist (!=) | |
3306 | 2 => All RRs in iplist (==) | |
3307 | 3 => Some RRs not in iplist (!==) | |
3308 | the two bits are defined as MT_NOT and MT_ALL | |
8e669ac1 | 3309 | defer_return what to return for a defer |
0bcb2a0e PH |
3310 | |
3311 | Returns: OK if lookup succeeded | |
3312 | FAIL if not | |
3313 | */ | |
3314 | ||
3315 | static int | |
d6f6e0dc | 3316 | one_check_dnsbl(uschar *domain, uschar *domain_txt, uschar *keydomain, |
431b7361 | 3317 | uschar *prepend, uschar *iplist, BOOL bitmask, int match_type, |
d6f6e0dc | 3318 | int defer_return) |
8e669ac1 | 3319 | { |
0bcb2a0e PH |
3320 | dns_answer dnsa; |
3321 | dns_scan dnss; | |
3322 | tree_node *t; | |
3323 | dnsbl_cache_block *cb; | |
3324 | int old_pool = store_pool; | |
d6f6e0dc PH |
3325 | uschar query[256]; /* DNS domain max length */ |
3326 | ||
3327 | /* Construct the specific query domainname */ | |
3328 | ||
3329 | if (!string_format(query, sizeof(query), "%s.%s", prepend, domain)) | |
3330 | { | |
3331 | log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long " | |
3332 | "(ignored): %s...", query); | |
3333 | return FAIL; | |
3334 | } | |
0bcb2a0e PH |
3335 | |
3336 | /* Look for this query in the cache. */ | |
3337 | ||
14b3c5bc JH |
3338 | if ( (t = tree_search(dnsbl_cache, query)) |
3339 | && (cb = t->data.ptr)->expiry > time(NULL) | |
3340 | ) | |
3341 | ||
3342 | /* Previous lookup was cached */ | |
3343 | ||
3344 | { | |
3345 | HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n"); | |
3346 | } | |
0bcb2a0e PH |
3347 | |
3348 | /* If not cached from a previous lookup, we must do a DNS lookup, and | |
3349 | cache the result in permanent memory. */ | |
3350 | ||
14b3c5bc | 3351 | else |
0bcb2a0e | 3352 | { |
e162fc97 | 3353 | uint ttl = 3600; |
14b3c5bc | 3354 | |
0bcb2a0e PH |
3355 | store_pool = POOL_PERM; |
3356 | ||
14b3c5bc JH |
3357 | if (t) |
3358 | { | |
3359 | HDEBUG(D_dnsbl) debug_printf("cached data found but past valid time; "); | |
3360 | } | |
0bcb2a0e | 3361 | |
14b3c5bc JH |
3362 | else |
3363 | { /* Set up a tree entry to cache the lookup */ | |
3364 | t = store_get(sizeof(tree_node) + Ustrlen(query)); | |
3365 | Ustrcpy(t->name, query); | |
3366 | t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block)); | |
3367 | (void)tree_insertnode(&dnsbl_cache, t); | |
3368 | } | |
0bcb2a0e | 3369 | |
4c04137d | 3370 | /* Do the DNS lookup . */ |
0bcb2a0e PH |
3371 | |
3372 | HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query); | |
3373 | cb->rc = dns_basic_lookup(&dnsa, query, T_A); | |
3374 | cb->text_set = FALSE; | |
3375 | cb->text = NULL; | |
3376 | cb->rhs = NULL; | |
3377 | ||
3378 | /* If the lookup succeeded, cache the RHS address. The code allows for | |
3379 | more than one address - this was for complete generality and the possible | |
3380 | use of A6 records. However, A6 records have been reduced to experimental | |
3381 | status (August 2001) and may die out. So they may never get used at all, | |
3382 | let alone in dnsbl records. However, leave the code here, just in case. | |
3383 | ||
3384 | Quite apart from one A6 RR generating multiple addresses, there are DNS | |
3385 | lists that return more than one A record, so we must handle multiple | |
e162fc97 JH |
3386 | addresses generated in that way as well. |
3387 | ||
3388 | Mark the cache entry with the "now" plus the minimum of the address TTLs, | |
3389 | or some suitably far-future time if none were found. */ | |
0bcb2a0e PH |
3390 | |
3391 | if (cb->rc == DNS_SUCCEED) | |
3392 | { | |
3393 | dns_record *rr; | |
3394 | dns_address **addrp = &(cb->rhs); | |
3395 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
e1a3f32f | 3396 | rr; |
0bcb2a0e PH |
3397 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) |
3398 | { | |
3399 | if (rr->type == T_A) | |
3400 | { | |
3401 | dns_address *da = dns_address_from_rr(&dnsa, rr); | |
e1a3f32f | 3402 | if (da) |
0bcb2a0e PH |
3403 | { |
3404 | *addrp = da; | |
3405 | while (da->next != NULL) da = da->next; | |
3406 | addrp = &(da->next); | |
14b3c5bc | 3407 | if (ttl > rr->ttl) ttl = rr->ttl; |
0bcb2a0e PH |
3408 | } |
3409 | } | |
3410 | } | |
3411 | ||
3412 | /* If we didn't find any A records, change the return code. This can | |
3413 | happen when there is a CNAME record but there are no A records for what | |
3414 | it points to. */ | |
3415 | ||
3416 | if (cb->rhs == NULL) cb->rc = DNS_NODATA; | |
3417 | } | |
3418 | ||
14b3c5bc | 3419 | cb->expiry = time(NULL)+ttl; |
0bcb2a0e PH |
3420 | store_pool = old_pool; |
3421 | } | |
3422 | ||
0bcb2a0e PH |
3423 | /* We now have the result of the DNS lookup, either newly done, or cached |
3424 | from a previous call. If the lookup succeeded, check against the address | |
3425 | list if there is one. This may be a positive equality list (introduced by | |
3426 | "="), a negative equality list (introduced by "!="), a positive bitmask | |
3427 | list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/ | |
3428 | ||
3429 | if (cb->rc == DNS_SUCCEED) | |
3430 | { | |
3431 | dns_address *da = NULL; | |
3432 | uschar *addlist = cb->rhs->address; | |
3433 | ||
3434 | /* For A and AAAA records, there may be multiple addresses from multiple | |
3435 | records. For A6 records (currently not expected to be used) there may be | |
3436 | multiple addresses from a single record. */ | |
3437 | ||
3438 | for (da = cb->rhs->next; da != NULL; da = da->next) | |
3439 | addlist = string_sprintf("%s, %s", addlist, da->address); | |
3440 | ||
3441 | HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n", | |
3442 | query, addlist); | |
3443 | ||
3444 | /* Address list check; this can be either for equality, or via a bitmask. | |
3445 | In the latter case, all the bits must match. */ | |
3446 | ||
3447 | if (iplist != NULL) | |
3448 | { | |
431b7361 | 3449 | for (da = cb->rhs; da != NULL; da = da->next) |
0bcb2a0e | 3450 | { |
431b7361 PH |
3451 | int ipsep = ','; |
3452 | uschar ip[46]; | |
55414b25 | 3453 | const uschar *ptr = iplist; |
431b7361 PH |
3454 | uschar *res; |
3455 | ||
0bcb2a0e | 3456 | /* Handle exact matching */ |
431b7361 | 3457 | |
0bcb2a0e PH |
3458 | if (!bitmask) |
3459 | { | |
431b7361 | 3460 | while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL) |
0bcb2a0e PH |
3461 | { |
3462 | if (Ustrcmp(CS da->address, ip) == 0) break; | |
3463 | } | |
3464 | } | |
431b7361 | 3465 | |
0bcb2a0e | 3466 | /* Handle bitmask matching */ |
431b7361 | 3467 | |
0bcb2a0e PH |
3468 | else |
3469 | { | |
3470 | int address[4]; | |
3471 | int mask = 0; | |
3472 | ||
3473 | /* At present, all known DNS blocking lists use A records, with | |
3474 | IPv4 addresses on the RHS encoding the information they return. I | |
3475 | wonder if this will linger on as the last vestige of IPv4 when IPv6 | |
3476 | is ubiquitous? Anyway, for now we use paranoia code to completely | |
3477 | ignore IPv6 addresses. The default mask is 0, which always matches. | |
3478 | We change this only for IPv4 addresses in the list. */ | |
3479 | ||
431b7361 | 3480 | if (host_aton(da->address, address) == 1) mask = address[0]; |
0bcb2a0e PH |
3481 | |
3482 | /* Scan the returned addresses, skipping any that are IPv6 */ | |
3483 | ||
431b7361 | 3484 | while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL) |
0bcb2a0e | 3485 | { |
431b7361 PH |
3486 | if (host_aton(ip, address) != 1) continue; |
3487 | if ((address[0] & mask) == address[0]) break; | |
0bcb2a0e PH |
3488 | } |
3489 | } | |
3490 | ||
431b7361 PH |
3491 | /* If either |
3492 | ||
3493 | (a) An IP address in an any ('=') list matched, or | |
3494 | (b) No IP address in an all ('==') list matched | |
0bcb2a0e | 3495 | |
431b7361 PH |
3496 | then we're done searching. */ |
3497 | ||
3498 | if (((match_type & MT_ALL) != 0) == (res == NULL)) break; | |
0bcb2a0e PH |
3499 | } |
3500 | ||
431b7361 | 3501 | /* If da == NULL, either |
0bcb2a0e | 3502 | |
431b7361 PH |
3503 | (a) No IP address in an any ('=') list matched, or |
3504 | (b) An IP address in an all ('==') list didn't match | |
0bcb2a0e | 3505 | |
431b7361 PH |
3506 | so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on |
3507 | the list. */ | |
0bcb2a0e | 3508 | |
431b7361 | 3509 | if ((match_type == MT_NOT || match_type == MT_ALL) != (da == NULL)) |
0bcb2a0e PH |
3510 | { |
3511 | HDEBUG(D_dnsbl) | |
3512 | { | |
431b7361 PH |
3513 | uschar *res = NULL; |
3514 | switch(match_type) | |
3515 | { | |
3516 | case 0: | |
3517 | res = US"was no match"; | |
3518 | break; | |
3519 | case MT_NOT: | |
3520 | res = US"was an exclude match"; | |
3521 | break; | |
3522 | case MT_ALL: | |
3523 | res = US"was an IP address that did not match"; | |
3524 | break; | |
3525 | case MT_NOT|MT_ALL: | |
3526 | res = US"were no IP addresses that did not match"; | |
3527 | break; | |
3528 | } | |
0bcb2a0e | 3529 | debug_printf("=> but we are not accepting this block class because\n"); |
431b7361 PH |
3530 | debug_printf("=> there %s for %s%c%s\n", |
3531 | res, | |
3532 | ((match_type & MT_ALL) == 0)? "" : "=", | |
3533 | bitmask? '&' : '=', iplist); | |
0bcb2a0e | 3534 | } |
8e669ac1 | 3535 | return FAIL; |
0bcb2a0e PH |
3536 | } |
3537 | } | |
3538 | ||
d6f6e0dc PH |
3539 | /* Either there was no IP list, or the record matched, implying that the |
3540 | domain is on the list. We now want to find a corresponding TXT record. If an | |
3541 | alternate domain is specified for the TXT record, call this function | |
3542 | recursively to look that up; this has the side effect of re-checking that | |
3543 | there is indeed an A record at the alternate domain. */ | |
3544 | ||
3545 | if (domain_txt != domain) | |
3546 | return one_check_dnsbl(domain_txt, domain_txt, keydomain, prepend, NULL, | |
431b7361 | 3547 | FALSE, match_type, defer_return); |
d6f6e0dc PH |
3548 | |
3549 | /* If there is no alternate domain, look up a TXT record in the main domain | |
3550 | if it has not previously been cached. */ | |
0bcb2a0e PH |
3551 | |
3552 | if (!cb->text_set) | |
3553 | { | |
3554 | cb->text_set = TRUE; | |
3555 | if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED) | |
3556 | { | |
3557 | dns_record *rr; | |
3558 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
3559 | rr != NULL; | |
3560 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
3561 | if (rr->type == T_TXT) break; | |
3562 | if (rr != NULL) | |
3563 | { | |
3564 | int len = (rr->data)[0]; | |
3565 | if (len > 511) len = 127; | |
3566 | store_pool = POOL_PERM; | |
3567 | cb->text = string_sprintf("%.*s", len, (const uschar *)(rr->data+1)); | |
3568 | store_pool = old_pool; | |
3569 | } | |
3570 | } | |
3571 | } | |
3572 | ||
3573 | dnslist_value = addlist; | |
3574 | dnslist_text = cb->text; | |
3575 | return OK; | |
3576 | } | |
3577 | ||
3578 | /* There was a problem with the DNS lookup */ | |
3579 | ||
3580 | if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA) | |
3581 | { | |
3582 | log_write(L_dnslist_defer, LOG_MAIN, | |
3583 | "DNS list lookup defer (probably timeout) for %s: %s", query, | |
3584 | (defer_return == OK)? US"assumed in list" : | |
3585 | (defer_return == FAIL)? US"assumed not in list" : | |
3586 | US"returned DEFER"); | |
3587 | return defer_return; | |
3588 | } | |
3589 | ||
3590 | /* No entry was found in the DNS; continue for next domain */ | |
3591 | ||
3592 | HDEBUG(D_dnsbl) | |
3593 | { | |
3594 | debug_printf("DNS lookup for %s failed\n", query); | |
3595 | debug_printf("=> that means %s is not listed at %s\n", | |
3596 | keydomain, domain); | |
3597 | } | |
3598 | ||
3599 | return FAIL; | |
3600 | } | |
3601 | ||
3602 | ||
3603 | ||
3604 | ||
059ec3d9 PH |
3605 | /************************************************* |
3606 | * Check host against DNS black lists * | |
3607 | *************************************************/ | |
3608 | ||
3609 | /* This function runs checks against a list of DNS black lists, until one | |
3610 | matches. Each item on the list can be of the form | |
3611 | ||
3612 | domain=ip-address/key | |
3613 | ||
3614 | The domain is the right-most domain that is used for the query, for example, | |
3615 | blackholes.mail-abuse.org. If the IP address is present, there is a match only | |
3616 | if the DNS lookup returns a matching IP address. Several addresses may be | |
3617 | given, comma-separated, for example: x.y.z=127.0.0.1,127.0.0.2. | |
3618 | ||
3619 | If no key is given, what is looked up in the domain is the inverted IP address | |
3620 | of the current client host. If a key is given, it is used to construct the | |
d6f6e0dc | 3621 | domain for the lookup. For example: |
059ec3d9 PH |
3622 | |
3623 | dsn.rfc-ignorant.org/$sender_address_domain | |
3624 | ||
3625 | After finding a match in the DNS, the domain is placed in $dnslist_domain, and | |
3626 | then we check for a TXT record for an error message, and if found, save its | |
3627 | value in $dnslist_text. We also cache everything in a tree, to optimize | |
3628 | multiple lookups. | |
3629 | ||
d6f6e0dc PH |
3630 | The TXT record is normally looked up in the same domain as the A record, but |
3631 | when many lists are combined in a single DNS domain, this will not be a very | |
3632 | specific message. It is possible to specify a different domain for looking up | |
3633 | TXT records; this is given before the main domain, comma-separated. For | |
3634 | example: | |
3635 | ||
3636 | dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \ | |
3637 | socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3 | |
3638 | ||
3639 | The caching ensures that only one lookup in dnsbl.sorbs.net is done. | |
3640 | ||
059ec3d9 PH |
3641 | Note: an address for testing RBL is 192.203.178.39 |
3642 | Note: an address for testing DUL is 192.203.178.4 | |
3643 | Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org | |
3644 | ||
3645 | Arguments: | |
379ba7d0 | 3646 | where the acl type |
059ec3d9 | 3647 | listptr the domain/address/data list |
379ba7d0 | 3648 | log_msgptr log message on error |
059ec3d9 PH |
3649 | |
3650 | Returns: OK successful lookup (i.e. the address is on the list), or | |
3651 | lookup deferred after +include_unknown | |
3652 | FAIL name not found, or no data found for the given type, or | |
3653 | lookup deferred after +exclude_unknown (default) | |
3654 | DEFER lookup failure, if +defer_unknown was set | |
3655 | */ | |
3656 | ||
3657 | int | |
379ba7d0 | 3658 | verify_check_dnsbl(int where, const uschar ** listptr, uschar ** log_msgptr) |
059ec3d9 PH |
3659 | { |
3660 | int sep = 0; | |
3661 | int defer_return = FAIL; | |
55414b25 | 3662 | const uschar *list = *listptr; |
059ec3d9 PH |
3663 | uschar *domain; |
3664 | uschar *s; | |
3665 | uschar buffer[1024]; | |
059ec3d9 PH |
3666 | uschar revadd[128]; /* Long enough for IPv6 address */ |
3667 | ||
3668 | /* Indicate that the inverted IP address is not yet set up */ | |
3669 | ||
3670 | revadd[0] = 0; | |
3671 | ||
0bcb2a0e PH |
3672 | /* In case this is the first time the DNS resolver is being used. */ |
3673 | ||
8c51eead | 3674 | dns_init(FALSE, FALSE, FALSE); /*XXX dnssec? */ |
0bcb2a0e | 3675 | |
059ec3d9 PH |
3676 | /* Loop through all the domains supplied, until something matches */ |
3677 | ||
3678 | while ((domain = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL) | |
3679 | { | |
0bcb2a0e | 3680 | int rc; |
059ec3d9 | 3681 | BOOL bitmask = FALSE; |
431b7361 | 3682 | int match_type = 0; |
d6f6e0dc PH |
3683 | uschar *domain_txt; |
3684 | uschar *comma; | |
059ec3d9 PH |
3685 | uschar *iplist; |
3686 | uschar *key; | |
059ec3d9 PH |
3687 | |
3688 | HDEBUG(D_dnsbl) debug_printf("DNS list check: %s\n", domain); | |
3689 | ||
3690 | /* Deal with special values that change the behaviour on defer */ | |
3691 | ||
3692 | if (domain[0] == '+') | |
3693 | { | |
3694 | if (strcmpic(domain, US"+include_unknown") == 0) defer_return = OK; | |
3695 | else if (strcmpic(domain, US"+exclude_unknown") == 0) defer_return = FAIL; | |
3696 | else if (strcmpic(domain, US"+defer_unknown") == 0) defer_return = DEFER; | |
3697 | else | |
3698 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown item in dnslist (ignored): %s", | |
3699 | domain); | |
3700 | continue; | |
3701 | } | |
3702 | ||
3703 | /* See if there's explicit data to be looked up */ | |
3704 | ||
379ba7d0 | 3705 | if ((key = Ustrchr(domain, '/'))) *key++ = 0; |
059ec3d9 PH |
3706 | |
3707 | /* See if there's a list of addresses supplied after the domain name. This is | |
431b7361 PH |
3708 | introduced by an = or a & character; if preceded by = we require all matches |
3709 | and if preceded by ! we invert the result. */ | |
059ec3d9 | 3710 | |
379ba7d0 | 3711 | if (!(iplist = Ustrchr(domain, '='))) |
059ec3d9 PH |
3712 | { |
3713 | bitmask = TRUE; | |
3714 | iplist = Ustrchr(domain, '&'); | |
3715 | } | |
3716 | ||
379ba7d0 | 3717 | if (iplist) /* Found either = or & */ |
059ec3d9 | 3718 | { |
431b7361 | 3719 | if (iplist > domain && iplist[-1] == '!') /* Handle preceding ! */ |
059ec3d9 | 3720 | { |
431b7361 | 3721 | match_type |= MT_NOT; |
059ec3d9 PH |
3722 | iplist[-1] = 0; |
3723 | } | |
431b7361 PH |
3724 | |
3725 | *iplist++ = 0; /* Terminate domain, move on */ | |
3726 | ||
3727 | /* If we found = (bitmask == FALSE), check for == or =& */ | |
3728 | ||
3729 | if (!bitmask && (*iplist == '=' || *iplist == '&')) | |
3730 | { | |
3731 | bitmask = *iplist++ == '&'; | |
3732 | match_type |= MT_ALL; | |
3733 | } | |
059ec3d9 PH |
3734 | } |
3735 | ||
379ba7d0 | 3736 | |
d6f6e0dc PH |
3737 | /* If there is a comma in the domain, it indicates that a second domain for |
3738 | looking up TXT records is provided, before the main domain. Otherwise we must | |
3739 | set domain_txt == domain. */ | |
3740 | ||
3741 | domain_txt = domain; | |
3742 | comma = Ustrchr(domain, ','); | |
3743 | if (comma != NULL) | |
3744 | { | |
3745 | *comma++ = 0; | |
3746 | domain = comma; | |
3747 | } | |
3748 | ||
059ec3d9 PH |
3749 | /* Check that what we have left is a sensible domain name. There is no reason |
3750 | why these domains should in fact use the same syntax as hosts and email | |
3751 | domains, but in practice they seem to. However, there is little point in | |
3752 | actually causing an error here, because that would no doubt hold up incoming | |
3753 | mail. Instead, I'll just log it. */ | |
3754 | ||
3755 | for (s = domain; *s != 0; s++) | |
3756 | { | |
09dcaba9 | 3757 | if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_') |
059ec3d9 PH |
3758 | { |
3759 | log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains " | |
3760 | "strange characters - is this right?", domain); | |
3761 | break; | |
3762 | } | |
3763 | } | |
3764 | ||
d6f6e0dc PH |
3765 | /* Check the alternate domain if present */ |
3766 | ||
3767 | if (domain_txt != domain) for (s = domain_txt; *s != 0; s++) | |
3768 | { | |
09dcaba9 | 3769 | if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_') |
d6f6e0dc PH |
3770 | { |
3771 | log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains " | |
3772 | "strange characters - is this right?", domain_txt); | |
3773 | break; | |
3774 | } | |
3775 | } | |
3776 | ||
8e669ac1 | 3777 | /* If there is no key string, construct the query by adding the domain name |
0bcb2a0e | 3778 | onto the inverted host address, and perform a single DNS lookup. */ |
8e669ac1 | 3779 | |
059ec3d9 PH |
3780 | if (key == NULL) |
3781 | { | |
379ba7d0 JH |
3782 | if (where == ACL_WHERE_NOTSMTP_START || where == ACL_WHERE_NOTSMTP) |
3783 | { | |
3784 | *log_msgptr = string_sprintf | |
3785 | ("cannot test auto-keyed dnslists condition in %s ACL", | |
3786 | acl_wherenames[where]); | |
3787 | return ERROR; | |
3788 | } | |
059ec3d9 PH |
3789 | if (sender_host_address == NULL) return FAIL; /* can never match */ |
3790 | if (revadd[0] == 0) invert_address(revadd, sender_host_address); | |
d6f6e0dc | 3791 | rc = one_check_dnsbl(domain, domain_txt, sender_host_address, revadd, |
431b7361 | 3792 | iplist, bitmask, match_type, defer_return); |
0bcb2a0e PH |
3793 | if (rc == OK) |
3794 | { | |
d6f6e0dc | 3795 | dnslist_domain = string_copy(domain_txt); |
93655c46 | 3796 | dnslist_matched = string_copy(sender_host_address); |
8e669ac1 | 3797 | HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n", |
d6f6e0dc | 3798 | sender_host_address, dnslist_domain); |
0bcb2a0e | 3799 | } |
0bcb2a0e | 3800 | if (rc != FAIL) return rc; /* OK or DEFER */ |
059ec3d9 | 3801 | } |
8e669ac1 PH |
3802 | |
3803 | /* If there is a key string, it can be a list of domains or IP addresses to | |
0bcb2a0e | 3804 | be concatenated with the main domain. */ |
8e669ac1 | 3805 | |
059ec3d9 PH |
3806 | else |
3807 | { | |
0bcb2a0e | 3808 | int keysep = 0; |
8e669ac1 PH |
3809 | BOOL defer = FALSE; |
3810 | uschar *keydomain; | |
0bcb2a0e | 3811 | uschar keybuffer[256]; |
d6f6e0dc | 3812 | uschar keyrevadd[128]; |
8e669ac1 | 3813 | |
55414b25 | 3814 | while ((keydomain = string_nextinlist(CUSS &key, &keysep, keybuffer, |
0bcb2a0e | 3815 | sizeof(keybuffer))) != NULL) |
8e669ac1 | 3816 | { |
d6f6e0dc PH |
3817 | uschar *prepend = keydomain; |
3818 | ||
7e66e54d | 3819 | if (string_is_ip_address(keydomain, NULL) != 0) |
059ec3d9 | 3820 | { |
0bcb2a0e | 3821 | invert_address(keyrevadd, keydomain); |
d6f6e0dc | 3822 | prepend = keyrevadd; |
059ec3d9 | 3823 | } |
8e669ac1 | 3824 | |
d6f6e0dc | 3825 | rc = one_check_dnsbl(domain, domain_txt, keydomain, prepend, iplist, |
431b7361 | 3826 | bitmask, match_type, defer_return); |
8e669ac1 | 3827 | |
0bcb2a0e | 3828 | if (rc == OK) |
059ec3d9 | 3829 | { |
d6f6e0dc | 3830 | dnslist_domain = string_copy(domain_txt); |
93655c46 | 3831 | dnslist_matched = string_copy(keydomain); |
8e669ac1 | 3832 | HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n", |
d6f6e0dc | 3833 | keydomain, dnslist_domain); |
8e669ac1 | 3834 | return OK; |
059ec3d9 | 3835 | } |
8e669ac1 | 3836 | |
c38d6da9 PH |
3837 | /* If the lookup deferred, remember this fact. We keep trying the rest |
3838 | of the list to see if we get a useful result, and if we don't, we return | |
3839 | DEFER at the end. */ | |
059ec3d9 | 3840 | |
c38d6da9 | 3841 | if (rc == DEFER) defer = TRUE; |
0bcb2a0e | 3842 | } /* continue with next keystring domain/address */ |
c38d6da9 PH |
3843 | |
3844 | if (defer) return DEFER; | |
8e669ac1 | 3845 | } |
0bcb2a0e | 3846 | } /* continue with next dnsdb outer domain */ |
059ec3d9 PH |
3847 | |
3848 | return FAIL; | |
3849 | } | |
3850 | ||
511a6c14 JH |
3851 | /* vi: aw ai sw=2 |
3852 | */ | |
059ec3d9 | 3853 | /* End of verify.c */ |