Commit | Line | Data |
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059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
f9ba5e22 | 5 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
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 | ||
b6323c75 | 71 | if (!(cache_record = dbfn_read_with_length(dbm_file, key, &length))) |
059ec3d9 | 72 | { |
6f4d5ad3 | 73 | HDEBUG(D_verify) debug_printf("callout cache: no %s record found for %s\n", type, key); |
059ec3d9 PH |
74 | return NULL; |
75 | } | |
76 | ||
77 | /* We treat a record as "negative" if its result field is not positive, or if | |
78 | it is a domain record and the postmaster field is negative. */ | |
79 | ||
80 | negative = cache_record->result != ccache_accept || | |
81 | (type[0] == 'd' && cache_record->postmaster_result == ccache_reject); | |
82 | expire = negative? negative_expire : positive_expire; | |
83 | now = time(NULL); | |
84 | ||
85 | if (now - cache_record->time_stamp > expire) | |
86 | { | |
6f4d5ad3 | 87 | HDEBUG(D_verify) debug_printf("callout cache: %s record expired for %s\n", type, key); |
059ec3d9 PH |
88 | return NULL; |
89 | } | |
90 | ||
91 | /* If this is a non-reject domain record, check for the obsolete format version | |
92 | that doesn't have the postmaster and random timestamps, by looking at the | |
93 | length. If so, copy it to a new-style block, replicating the record's | |
94 | timestamp. Then check the additional timestamps. (There's no point wasting | |
95 | effort if connections are rejected.) */ | |
96 | ||
97 | if (type[0] == 'd' && cache_record->result != ccache_reject) | |
98 | { | |
99 | if (length == sizeof(dbdata_callout_cache_obs)) | |
100 | { | |
101 | dbdata_callout_cache *new = store_get(sizeof(dbdata_callout_cache)); | |
102 | memcpy(new, cache_record, length); | |
103 | new->postmaster_stamp = new->random_stamp = new->time_stamp; | |
104 | cache_record = new; | |
105 | } | |
106 | ||
107 | if (now - cache_record->postmaster_stamp > expire) | |
108 | cache_record->postmaster_result = ccache_unknown; | |
109 | ||
110 | if (now - cache_record->random_stamp > expire) | |
111 | cache_record->random_result = ccache_unknown; | |
112 | } | |
113 | ||
6f4d5ad3 | 114 | HDEBUG(D_verify) debug_printf("callout cache: found %s record for %s\n", type, key); |
059ec3d9 PH |
115 | return cache_record; |
116 | } | |
117 | ||
118 | ||
119 | ||
707ee5b1 JH |
120 | /* Check the callout cache. |
121 | Options * pm_mailfrom may be modified by cache partial results. | |
059ec3d9 | 122 | |
707ee5b1 | 123 | Return: TRUE if result found |
059ec3d9 PH |
124 | */ |
125 | ||
707ee5b1 JH |
126 | static BOOL |
127 | cached_callout_lookup(address_item * addr, uschar * address_key, | |
128 | uschar * from_address, int * opt_ptr, uschar ** pm_ptr, | |
129 | int * yield, uschar ** failure_ptr, | |
130 | dbdata_callout_cache * new_domain_record, int * old_domain_res) | |
059ec3d9 | 131 | { |
707ee5b1 | 132 | int options = *opt_ptr; |
059ec3d9 PH |
133 | open_db dbblock; |
134 | open_db *dbm_file = NULL; | |
059ec3d9 PH |
135 | |
136 | /* Open the callout cache database, it it exists, for reading only at this | |
137 | stage, unless caching has been disabled. */ | |
138 | ||
8b9476ba | 139 | if (options & vopt_callout_no_cache) |
059ec3d9 PH |
140 | { |
141 | HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n"); | |
142 | } | |
707ee5b1 | 143 | else if (!(dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE))) |
059ec3d9 PH |
144 | { |
145 | HDEBUG(D_verify) debug_printf("callout cache: not available\n"); | |
146 | } | |
707ee5b1 | 147 | else |
059ec3d9 | 148 | { |
707ee5b1 JH |
149 | /* If a cache database is available see if we can avoid the need to do an |
150 | actual callout by making use of previously-obtained data. */ | |
151 | ||
152 | dbdata_callout_cache_address * cache_address_record; | |
153 | dbdata_callout_cache * cache_record = get_callout_cache_record(dbm_file, | |
154 | addr->domain, US"domain", | |
155 | callout_cache_domain_positive_expire, callout_cache_domain_negative_expire); | |
059ec3d9 PH |
156 | |
157 | /* If an unexpired cache record was found for this domain, see if the callout | |
158 | process can be short-circuited. */ | |
159 | ||
ff5929e3 | 160 | if (cache_record) |
059ec3d9 | 161 | { |
2b1c6e3a PH |
162 | /* In most cases, if an early command (up to and including MAIL FROM:<>) |
163 | was rejected, there is no point carrying on. The callout fails. However, if | |
164 | we are doing a recipient verification with use_sender or use_postmaster | |
165 | set, a previous failure of MAIL FROM:<> doesn't count, because this time we | |
166 | will be using a non-empty sender. We have to remember this situation so as | |
167 | not to disturb the cached domain value if this whole verification succeeds | |
168 | (we don't want it turning into "accept"). */ | |
169 | ||
707ee5b1 | 170 | *old_domain_res = cache_record->result; |
2b1c6e3a | 171 | |
707ee5b1 JH |
172 | if ( cache_record->result == ccache_reject |
173 | || *from_address == 0 && cache_record->result == ccache_reject_mfnull) | |
059ec3d9 PH |
174 | { |
175 | setflag(addr, af_verify_nsfail); | |
176 | HDEBUG(D_verify) | |
707ee5b1 JH |
177 | debug_printf("callout cache: domain gave initial rejection, or " |
178 | "does not accept HELO or MAIL FROM:<>\n"); | |
059ec3d9 PH |
179 | setflag(addr, af_verify_nsfail); |
180 | addr->user_message = US"(result of an earlier callout reused)."; | |
707ee5b1 | 181 | *yield = FAIL; |
8e669ac1 | 182 | *failure_ptr = US"mail"; |
707ee5b1 JH |
183 | dbfn_close(dbm_file); |
184 | return TRUE; | |
059ec3d9 PH |
185 | } |
186 | ||
187 | /* If a previous check on a "random" local part was accepted, we assume | |
188 | that the server does not do any checking on local parts. There is therefore | |
189 | no point in doing the callout, because it will always be successful. If a | |
190 | random check previously failed, arrange not to do it again, but preserve | |
191 | the data in the new record. If a random check is required but hasn't been | |
192 | done, skip the remaining cache processing. */ | |
193 | ||
8b9476ba | 194 | if (options & vopt_callout_random) switch(cache_record->random_result) |
059ec3d9 PH |
195 | { |
196 | case ccache_accept: | |
8b9476ba JH |
197 | HDEBUG(D_verify) |
198 | debug_printf("callout cache: domain accepts random addresses\n"); | |
707ee5b1 JH |
199 | dbfn_close(dbm_file); |
200 | return TRUE; /* Default yield is OK */ | |
059ec3d9 PH |
201 | |
202 | case ccache_reject: | |
8b9476ba JH |
203 | HDEBUG(D_verify) |
204 | debug_printf("callout cache: domain rejects random addresses\n"); | |
707ee5b1 JH |
205 | *opt_ptr = options & ~vopt_callout_random; |
206 | new_domain_record->random_result = ccache_reject; | |
207 | new_domain_record->random_stamp = cache_record->random_stamp; | |
8b9476ba | 208 | break; |
059ec3d9 PH |
209 | |
210 | default: | |
8b9476ba JH |
211 | HDEBUG(D_verify) |
212 | debug_printf("callout cache: need to check random address handling " | |
213 | "(not cached or cache expired)\n"); | |
707ee5b1 JH |
214 | dbfn_close(dbm_file); |
215 | return FALSE; | |
059ec3d9 PH |
216 | } |
217 | ||
218 | /* If a postmaster check is requested, but there was a previous failure, | |
219 | there is again no point in carrying on. If a postmaster check is required, | |
220 | but has not been done before, we are going to have to do a callout, so skip | |
221 | remaining cache processing. */ | |
222 | ||
707ee5b1 | 223 | if (*pm_ptr) |
059ec3d9 PH |
224 | { |
225 | if (cache_record->postmaster_result == ccache_reject) | |
707ee5b1 JH |
226 | { |
227 | setflag(addr, af_verify_pmfail); | |
228 | HDEBUG(D_verify) | |
229 | debug_printf("callout cache: domain does not accept " | |
230 | "RCPT TO:<postmaster@domain>\n"); | |
231 | *yield = FAIL; | |
232 | *failure_ptr = US"postmaster"; | |
233 | setflag(addr, af_verify_pmfail); | |
234 | addr->user_message = US"(result of earlier verification reused)."; | |
235 | dbfn_close(dbm_file); | |
236 | return TRUE; | |
237 | } | |
059ec3d9 | 238 | if (cache_record->postmaster_result == ccache_unknown) |
707ee5b1 JH |
239 | { |
240 | HDEBUG(D_verify) | |
241 | debug_printf("callout cache: need to check RCPT " | |
242 | "TO:<postmaster@domain> (not cached or cache expired)\n"); | |
243 | dbfn_close(dbm_file); | |
244 | return FALSE; | |
245 | } | |
059ec3d9 PH |
246 | |
247 | /* If cache says OK, set pm_mailfrom NULL to prevent a redundant | |
248 | postmaster check if the address itself has to be checked. Also ensure | |
249 | that the value in the cache record is preserved (with its old timestamp). | |
250 | */ | |
251 | ||
252 | HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT " | |
707ee5b1 JH |
253 | "TO:<postmaster@domain>\n"); |
254 | *pm_ptr = NULL; | |
255 | new_domain_record->postmaster_result = ccache_accept; | |
256 | new_domain_record->postmaster_stamp = cache_record->postmaster_stamp; | |
059ec3d9 PH |
257 | } |
258 | } | |
259 | ||
260 | /* We can't give a result based on information about the domain. See if there | |
261 | is an unexpired cache record for this specific address (combined with the | |
262 | sender address if we are doing a recipient callout with a non-empty sender). | |
263 | */ | |
264 | ||
707ee5b1 JH |
265 | if (!(cache_address_record = (dbdata_callout_cache_address *) |
266 | get_callout_cache_record(dbm_file, address_key, US"address", | |
267 | callout_cache_positive_expire, callout_cache_negative_expire))) | |
268 | { | |
269 | dbfn_close(dbm_file); | |
270 | return FALSE; | |
271 | } | |
059ec3d9 | 272 | |
707ee5b1 | 273 | if (cache_address_record->result == ccache_accept) |
059ec3d9 | 274 | { |
707ee5b1 JH |
275 | HDEBUG(D_verify) |
276 | debug_printf("callout cache: address record is positive\n"); | |
277 | } | |
278 | else | |
279 | { | |
280 | HDEBUG(D_verify) | |
281 | debug_printf("callout cache: address record is negative\n"); | |
282 | addr->user_message = US"Previous (cached) callout verification failure"; | |
283 | *failure_ptr = US"recipient"; | |
284 | *yield = FAIL; | |
059ec3d9 PH |
285 | } |
286 | ||
287 | /* Close the cache database while we actually do the callout for real. */ | |
288 | ||
059ec3d9 | 289 | dbfn_close(dbm_file); |
707ee5b1 JH |
290 | return TRUE; |
291 | } | |
292 | return FALSE; | |
293 | } | |
294 | ||
295 | ||
296 | /* Write results to callout cache | |
297 | */ | |
298 | static void | |
299 | cache_callout_write(dbdata_callout_cache * dom_rec, const uschar * domain, | |
300 | int done, dbdata_callout_cache_address * addr_rec, uschar * address_key) | |
301 | { | |
302 | open_db dbblock; | |
303 | open_db *dbm_file = NULL; | |
304 | ||
305 | /* If we get here with done == TRUE, a successful callout happened, and yield | |
306 | will be set OK or FAIL according to the response to the RCPT command. | |
307 | Otherwise, we looped through the hosts but couldn't complete the business. | |
308 | However, there may be domain-specific information to cache in both cases. | |
309 | ||
310 | The value of the result field in the new_domain record is ccache_unknown if | |
311 | there was an error before or with MAIL FROM:, and errno was not zero, | |
312 | implying some kind of I/O error. We don't want to write the cache in that case. | |
313 | Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */ | |
314 | ||
315 | if (dom_rec->result != ccache_unknown) | |
316 | if (!(dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE))) | |
317 | { | |
318 | HDEBUG(D_verify) debug_printf("callout cache: not available\n"); | |
319 | } | |
320 | else | |
321 | { | |
322 | (void)dbfn_write(dbm_file, domain, dom_rec, | |
323 | (int)sizeof(dbdata_callout_cache)); | |
324 | HDEBUG(D_verify) debug_printf("wrote callout cache domain record for %s:\n" | |
325 | " result=%d postmaster=%d random=%d\n", | |
326 | domain, | |
327 | dom_rec->result, | |
328 | dom_rec->postmaster_result, | |
329 | dom_rec->random_result); | |
330 | } | |
331 | ||
332 | /* If a definite result was obtained for the callout, cache it unless caching | |
333 | is disabled. */ | |
334 | ||
335 | if (done && addr_rec->result != ccache_unknown) | |
336 | { | |
337 | if (!dbm_file) | |
338 | dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE); | |
339 | if (!dbm_file) | |
340 | { | |
341 | HDEBUG(D_verify) debug_printf("no callout cache available\n"); | |
342 | } | |
343 | else | |
344 | { | |
345 | (void)dbfn_write(dbm_file, address_key, addr_rec, | |
346 | (int)sizeof(dbdata_callout_cache_address)); | |
347 | HDEBUG(D_verify) debug_printf("wrote %s callout cache address record for %s\n", | |
348 | addr_rec->result == ccache_accept ? "positive" : "negative", | |
349 | address_key); | |
350 | } | |
351 | } | |
352 | ||
353 | if (dbm_file) dbfn_close(dbm_file); | |
354 | } | |
355 | ||
356 | ||
c4c940fd JH |
357 | /* Cutthrough-multi. If the existing cached cutthrough connection matches |
358 | the one we would make for a subsequent recipient, use it. Send the RCPT TO | |
359 | and check the result, nonpipelined as it may be wanted immediately for | |
360 | recipient-verification. | |
361 | ||
362 | It seems simpler to deal with this case separately from the main callout loop. | |
363 | We will need to remember it has sent, or not, so that rcpt-acl tail code | |
364 | can do it there for the non-rcpt-verify case. For this we keep an addresscount. | |
365 | ||
366 | Return: TRUE for a definitive result for the recipient | |
367 | */ | |
368 | static int | |
369 | cutthrough_multi(address_item * addr, host_item * host_list, | |
370 | transport_feedback * tf, int * yield) | |
371 | { | |
372 | BOOL done = FALSE; | |
373 | host_item * host; | |
374 | ||
375 | if (addr->transport == cutthrough.addr.transport) | |
376 | for (host = host_list; host; host = host->next) | |
377 | if (Ustrcmp(host->address, cutthrough.host.address) == 0) | |
378 | { | |
379 | int host_af; | |
380 | uschar *interface = NULL; /* Outgoing interface to use; NULL => any */ | |
381 | int port = 25; | |
382 | ||
383 | deliver_host = host->name; | |
384 | deliver_host_address = host->address; | |
385 | deliver_host_port = host->port; | |
386 | deliver_domain = addr->domain; | |
387 | transport_name = addr->transport->name; | |
388 | ||
57cc2785 | 389 | host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET; |
c4c940fd | 390 | |
f83a760f JH |
391 | if ( !smtp_get_interface(tf->interface, host_af, addr, &interface, |
392 | US"callout") | |
393 | || !smtp_get_port(tf->port, addr, &port, US"callout") | |
394 | ) | |
c4c940fd JH |
395 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address, |
396 | addr->message); | |
397 | ||
f83a760f JH |
398 | smtp_port_for_connect(host, port); |
399 | ||
c4c940fd JH |
400 | if ( ( interface == cutthrough.interface |
401 | || ( interface | |
402 | && cutthrough.interface | |
403 | && Ustrcmp(interface, cutthrough.interface) == 0 | |
404 | ) ) | |
f83a760f | 405 | && host->port == cutthrough.host.port |
c4c940fd JH |
406 | ) |
407 | { | |
408 | uschar * resp = NULL; | |
409 | ||
410 | /* Match! Send the RCPT TO, set done from the response */ | |
411 | done = | |
4e910c01 | 412 | smtp_write_command(&ctblock, SCMD_FLUSH, "RCPT TO:<%.1000s>\r\n", |
c4c940fd JH |
413 | transport_rcpt_address(addr, |
414 | addr->transport->rcpt_include_affixes)) >= 0 && | |
57cc2785 | 415 | cutthrough_response(cutthrough.fd, '2', &resp, CUTTHROUGH_DATA_TIMEOUT) == '2'; |
c4c940fd JH |
416 | |
417 | /* This would go horribly wrong if a callout fail was ignored by ACL. | |
418 | We punt by abandoning cutthrough on a reject, like the | |
419 | first-rcpt does. */ | |
420 | ||
421 | if (done) | |
422 | { | |
423 | address_item * na = store_get(sizeof(address_item)); | |
424 | *na = cutthrough.addr; | |
425 | cutthrough.addr = *addr; | |
426 | cutthrough.addr.host_used = &cutthrough.host; | |
427 | cutthrough.addr.next = na; | |
428 | ||
429 | cutthrough.nrcpt++; | |
430 | } | |
431 | else | |
432 | { | |
57cc2785 | 433 | cancel_cutthrough_connection(TRUE, US"recipient rejected"); |
c4c940fd JH |
434 | if (!resp || errno == ETIMEDOUT) |
435 | { | |
436 | HDEBUG(D_verify) debug_printf("SMTP timeout\n"); | |
437 | } | |
438 | else if (errno == 0) | |
439 | { | |
440 | if (*resp == 0) | |
441 | Ustrcpy(resp, US"connection dropped"); | |
442 | ||
443 | addr->message = | |
e9166683 JH |
444 | string_sprintf("response to \"%s\" was: %s", |
445 | big_buffer, string_printing(resp)); | |
c4c940fd JH |
446 | |
447 | addr->user_message = | |
448 | string_sprintf("Callout verification failed:\n%s", resp); | |
449 | ||
450 | /* Hard rejection ends the process */ | |
451 | ||
452 | if (resp[0] == '5') /* Address rejected */ | |
453 | { | |
454 | *yield = FAIL; | |
455 | done = TRUE; | |
456 | } | |
457 | } | |
458 | } | |
459 | } | |
460 | break; /* host_list */ | |
461 | } | |
462 | if (!done) | |
57cc2785 | 463 | cancel_cutthrough_connection(TRUE, US"incompatible connection"); |
c4c940fd JH |
464 | return done; |
465 | } | |
466 | ||
467 | ||
707ee5b1 JH |
468 | /************************************************* |
469 | * Do callout verification for an address * | |
470 | *************************************************/ | |
471 | ||
472 | /* This function is called from verify_address() when the address has routed to | |
473 | a host list, and a callout has been requested. Callouts are expensive; that is | |
474 | why a cache is used to improve the efficiency. | |
475 | ||
476 | Arguments: | |
477 | addr the address that's been routed | |
478 | host_list the list of hosts to try | |
479 | tf the transport feedback block | |
480 | ||
481 | ifstring "interface" option from transport, or NULL | |
482 | portstring "port" option from transport, or NULL | |
483 | protocolstring "protocol" option from transport, or NULL | |
484 | callout the per-command callout timeout | |
485 | callout_overall the overall callout timeout (if < 0 use 4*callout) | |
486 | callout_connect the callout connection timeout (if < 0 use callout) | |
487 | options the verification options - these bits are used: | |
488 | vopt_is_recipient => this is a recipient address | |
489 | vopt_callout_no_cache => don't use callout cache | |
490 | vopt_callout_fullpm => if postmaster check, do full one | |
491 | vopt_callout_random => do the "random" thing | |
492 | vopt_callout_recipsender => use real sender for recipient | |
493 | vopt_callout_recippmaster => use postmaster for recipient | |
57cc2785 | 494 | vopt_callout_hold => lazy close connection |
707ee5b1 JH |
495 | se_mailfrom MAIL FROM address for sender verify; NULL => "" |
496 | pm_mailfrom if non-NULL, do the postmaster check with this sender | |
497 | ||
498 | Returns: OK/FAIL/DEFER | |
499 | */ | |
500 | ||
501 | static int | |
502 | do_callout(address_item *addr, host_item *host_list, transport_feedback *tf, | |
503 | int callout, int callout_overall, int callout_connect, int options, | |
504 | uschar *se_mailfrom, uschar *pm_mailfrom) | |
505 | { | |
506 | int yield = OK; | |
507 | int old_domain_cache_result = ccache_accept; | |
508 | BOOL done = FALSE; | |
509 | uschar *address_key; | |
510 | uschar *from_address; | |
511 | uschar *random_local_part = NULL; | |
512 | const uschar *save_deliver_domain = deliver_domain; | |
513 | uschar **failure_ptr = options & vopt_is_recipient | |
514 | ? &recipient_verify_failure : &sender_verify_failure; | |
515 | dbdata_callout_cache new_domain_record; | |
516 | dbdata_callout_cache_address new_address_record; | |
707ee5b1 JH |
517 | time_t callout_start_time; |
518 | ||
519 | new_domain_record.result = ccache_unknown; | |
520 | new_domain_record.postmaster_result = ccache_unknown; | |
521 | new_domain_record.random_result = ccache_unknown; | |
522 | ||
523 | memset(&new_address_record, 0, sizeof(new_address_record)); | |
524 | ||
525 | /* For a recipient callout, the key used for the address cache record must | |
526 | include the sender address if we are using the real sender in the callout, | |
527 | because that may influence the result of the callout. */ | |
528 | ||
529 | if (options & vopt_is_recipient) | |
530 | if (options & vopt_callout_recipsender) | |
531 | { | |
532 | from_address = sender_address; | |
533 | address_key = string_sprintf("%s/<%s>", addr->address, sender_address); | |
534 | if (cutthrough.delivery) options |= vopt_callout_no_cache; | |
535 | } | |
536 | else if (options & vopt_callout_recippmaster) | |
537 | { | |
538 | from_address = string_sprintf("postmaster@%s", qualify_domain_sender); | |
539 | address_key = string_sprintf("%s/<postmaster@%s>", addr->address, | |
540 | qualify_domain_sender); | |
541 | } | |
542 | else | |
543 | { | |
544 | from_address = US""; | |
545 | address_key = addr->address; | |
546 | } | |
547 | ||
548 | /* For a sender callout, we must adjust the key if the mailfrom address is not | |
549 | empty. */ | |
550 | ||
551 | else | |
552 | { | |
553 | from_address = se_mailfrom ? se_mailfrom : US""; | |
554 | address_key = *from_address | |
555 | ? string_sprintf("%s/<%s>", addr->address, from_address) : addr->address; | |
059ec3d9 PH |
556 | } |
557 | ||
707ee5b1 JH |
558 | if (cached_callout_lookup(addr, address_key, from_address, |
559 | &options, &pm_mailfrom, &yield, failure_ptr, | |
560 | &new_domain_record, &old_domain_cache_result)) | |
57cc2785 JH |
561 | { |
562 | cancel_cutthrough_connection(TRUE, US"cache-hit"); | |
707ee5b1 | 563 | goto END_CALLOUT; |
57cc2785 | 564 | } |
707ee5b1 | 565 | |
193e3acd | 566 | if (!addr->transport) |
059ec3d9 | 567 | { |
193e3acd | 568 | HDEBUG(D_verify) debug_printf("cannot callout via null transport\n"); |
059ec3d9 | 569 | } |
6681531a HSHR |
570 | else if (Ustrcmp(addr->transport->driver_name, "smtp") != 0) |
571 | log_write(0, LOG_MAIN|LOG_PANIC|LOG_CONFIG_FOR, "callout transport '%s': %s is non-smtp", | |
572 | addr->transport->name, addr->transport->driver_name); | |
193e3acd JH |
573 | else |
574 | { | |
575 | smtp_transport_options_block *ob = | |
9d9c3746 | 576 | (smtp_transport_options_block *)addr->transport->options_block; |
c4c940fd | 577 | host_item * host; |
059ec3d9 | 578 | |
193e3acd JH |
579 | /* The information wasn't available in the cache, so we have to do a real |
580 | callout and save the result in the cache for next time, unless no_cache is set, | |
581 | or unless we have a previously cached negative random result. If we are to test | |
582 | with a random local part, ensure that such a local part is available. If not, | |
4c04137d | 583 | log the fact, but carry on without randomising. */ |
059ec3d9 | 584 | |
707ee5b1 | 585 | if (options & vopt_callout_random && callout_random_local_part) |
65f1c92a | 586 | if (!(random_local_part = expand_string(callout_random_local_part))) |
193e3acd JH |
587 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand " |
588 | "callout_random_local_part: %s", expand_string_message); | |
059ec3d9 | 589 | |
193e3acd JH |
590 | /* Default the connect and overall callout timeouts if not set, and record the |
591 | time we are starting so that we can enforce it. */ | |
4c590bd1 | 592 | |
193e3acd JH |
593 | if (callout_overall < 0) callout_overall = 4 * callout; |
594 | if (callout_connect < 0) callout_connect = callout; | |
595 | callout_start_time = time(NULL); | |
4c590bd1 | 596 | |
193e3acd JH |
597 | /* Before doing a real callout, if this is an SMTP connection, flush the SMTP |
598 | output because a callout might take some time. When PIPELINING is active and | |
599 | there are many recipients, the total time for doing lots of callouts can add up | |
600 | and cause the client to time out. So in this case we forgo the PIPELINING | |
601 | optimization. */ | |
817d9f57 | 602 | |
ff5929e3 | 603 | if (smtp_out && !disable_callout_flush) mac_smtp_fflush(); |
059ec3d9 | 604 | |
c4c940fd JH |
605 | clearflag(addr, af_verify_pmfail); /* postmaster callout flag */ |
606 | clearflag(addr, af_verify_nsfail); /* null sender callout flag */ | |
607 | ||
5032d1cf JH |
608 | /* cutthrough-multi: if a nonfirst rcpt has the same routing as the first, |
609 | and we are holding a cutthrough conn open, we can just append the rcpt to | |
610 | that conn for verification purposes (and later delivery also). Simplest | |
c4c940fd | 611 | coding means skipping this whole loop and doing the append separately. */ |
5032d1cf JH |
612 | |
613 | /* Can we re-use an open cutthrough connection? */ | |
614 | if ( cutthrough.fd >= 0 | |
615 | && (options & (vopt_callout_recipsender | vopt_callout_recippmaster)) | |
616 | == vopt_callout_recipsender | |
617 | && !random_local_part | |
618 | && !pm_mailfrom | |
619 | ) | |
c4c940fd | 620 | done = cutthrough_multi(addr, host_list, tf, &yield); |
5032d1cf | 621 | |
c4c940fd JH |
622 | /* If we did not use a cached connection, make connections to the hosts |
623 | and do real callouts. The list of hosts is passed in as an argument. */ | |
059ec3d9 | 624 | |
ff5929e3 | 625 | for (host = host_list; host && !done; host = host->next) |
059ec3d9 | 626 | { |
193e3acd JH |
627 | int host_af; |
628 | int port = 25; | |
193e3acd | 629 | uschar *interface = NULL; /* Outgoing interface to use; NULL => any */ |
02b41d71 | 630 | smtp_context sx; |
193e3acd | 631 | |
ff5929e3 | 632 | if (!host->address) |
193e3acd JH |
633 | { |
634 | DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n", | |
635 | host->name); | |
636 | continue; | |
637 | } | |
059ec3d9 | 638 | |
193e3acd | 639 | /* Check the overall callout timeout */ |
059ec3d9 | 640 | |
193e3acd JH |
641 | if (time(NULL) - callout_start_time >= callout_overall) |
642 | { | |
643 | HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n"); | |
644 | break; | |
645 | } | |
059ec3d9 | 646 | |
193e3acd | 647 | /* Set IPv4 or IPv6 */ |
059ec3d9 | 648 | |
e9166683 | 649 | host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET; |
de3a88fb | 650 | |
193e3acd JH |
651 | /* Expand and interpret the interface and port strings. The latter will not |
652 | be used if there is a host-specific port (e.g. from a manualroute router). | |
653 | This has to be delayed till now, because they may expand differently for | |
654 | different hosts. If there's a failure, log it, but carry on with the | |
655 | defaults. */ | |
de3a88fb | 656 | |
193e3acd JH |
657 | deliver_host = host->name; |
658 | deliver_host_address = host->address; | |
a7538db1 | 659 | deliver_host_port = host->port; |
193e3acd | 660 | deliver_domain = addr->domain; |
aec45841 | 661 | transport_name = addr->transport->name; |
059ec3d9 | 662 | |
6f6dedcc | 663 | if ( !smtp_get_interface(tf->interface, host_af, addr, &interface, |
bf7aabb4 JH |
664 | US"callout") |
665 | || !smtp_get_port(tf->port, addr, &port, US"callout") | |
666 | ) | |
193e3acd JH |
667 | log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address, |
668 | addr->message); | |
059ec3d9 | 669 | |
02b41d71 JH |
670 | sx.addrlist = addr; |
671 | sx.host = host; | |
672 | sx.host_af = host_af, | |
673 | sx.port = port; | |
674 | sx.interface = interface; | |
675 | sx.helo_data = tf->helo_data; | |
676 | sx.tblock = addr->transport; | |
e9166683 | 677 | sx.verify = TRUE; |
02b41d71 JH |
678 | |
679 | tls_retry_connection: | |
680 | /* Set the address state so that errors are recorded in it */ | |
681 | ||
682 | addr->transport_return = PENDING_DEFER; | |
683 | ob->connect_timeout = callout_connect; | |
684 | ob->command_timeout = callout; | |
685 | ||
686 | /* Get the channel set up ready for a message (MAIL FROM being the next | |
687 | SMTP command to send. If we tried TLS but it failed, try again without | |
688 | if permitted */ | |
689 | ||
f10e3ea3 JH |
690 | yield = smtp_setup_conn(&sx, FALSE); |
691 | #ifdef SUPPORT_TLS | |
692 | if ( yield == DEFER | |
02b41d71 JH |
693 | && addr->basic_errno == ERRNO_TLSFAILURE |
694 | && ob->tls_tempfail_tryclear | |
695 | && verify_check_given_host(&ob->hosts_require_tls, host) != OK | |
696 | ) | |
193e3acd | 697 | { |
cf0c6164 JH |
698 | log_write(0, LOG_MAIN, |
699 | "%s: callout unencrypted to %s [%s] (not in hosts_require_tls)", | |
700 | addr->message, host->name, host->address); | |
e9166683 JH |
701 | addr->transport_return = PENDING_DEFER; |
702 | yield = smtp_setup_conn(&sx, TRUE); | |
02b41d71 | 703 | } |
f10e3ea3 | 704 | #endif |
02b41d71 JH |
705 | if (yield != OK) |
706 | { | |
02b41d71 | 707 | errno = addr->basic_errno; |
aec45841 | 708 | transport_name = NULL; |
193e3acd JH |
709 | deliver_host = deliver_host_address = NULL; |
710 | deliver_domain = save_deliver_domain; | |
bf7aabb4 | 711 | |
02b41d71 JH |
712 | /* Failure to accept HELO is cached; this blocks the whole domain for all |
713 | senders. I/O errors and defer responses are not cached. */ | |
770747fd | 714 | |
02b41d71 | 715 | if (yield == FAIL && (errno == 0 || errno == ERRNO_SMTPCLOSED)) |
a7538db1 | 716 | { |
02b41d71 JH |
717 | setflag(addr, af_verify_nsfail); |
718 | new_domain_record.result = ccache_reject; | |
719 | done = TRUE; | |
a7538db1 | 720 | } |
193e3acd | 721 | else |
02b41d71 JH |
722 | done = FALSE; |
723 | goto no_conn; | |
3c8b3577 | 724 | } |
9bfc60eb | 725 | |
02b41d71 JH |
726 | /* If we needed to authenticate, smtp_setup_conn() did that. Copy |
727 | the AUTH info for logging */ | |
fcc8e047 | 728 | |
02b41d71 JH |
729 | addr->authenticator = client_authenticator; |
730 | addr->auth_id = client_authenticated_id; | |
b4a2b536 | 731 | |
e9166683 JH |
732 | sx.from_addr = from_address; |
733 | sx.first_addr = sx.sync_addr = addr; | |
734 | sx.ok = FALSE; /*XXX these 3 last might not be needed for verify? */ | |
735 | sx.send_rset = TRUE; | |
736 | sx.completed_addr = FALSE; | |
b4a2b536 | 737 | |
cf0c6164 | 738 | new_domain_record.result = old_domain_cache_result == ccache_reject_mfnull |
e9166683 | 739 | ? ccache_reject_mfnull : ccache_accept; |
c4c940fd | 740 | |
e9166683 JH |
741 | /* Do the random local part check first. Temporarily replace the recipient |
742 | with the "random" value */ | |
02b41d71 | 743 | |
e9166683 | 744 | if (random_local_part) |
059ec3d9 | 745 | { |
e9166683 | 746 | uschar * main_address = addr->address; |
921dfc11 JH |
747 | const uschar * rcpt_domain = addr->domain; |
748 | ||
8c5d388a | 749 | #ifdef SUPPORT_I18N |
921dfc11 JH |
750 | uschar * errstr = NULL; |
751 | if ( testflag(addr, af_utf8_downcvt) | |
752 | && (rcpt_domain = string_domain_utf8_to_alabel(rcpt_domain, | |
753 | &errstr), errstr) | |
754 | ) | |
755 | { | |
756 | addr->message = errstr; | |
757 | errno = ERRNO_EXPANDFAIL; | |
758 | setflag(addr, af_verify_nsfail); | |
759 | done = FALSE; | |
760 | rcpt_domain = US""; /*XXX errorhandling! */ | |
761 | } | |
762 | #endif | |
763 | ||
57cc2785 JH |
764 | /* This would be ok for 1st rcpt of a cutthrough (the case handled here; |
765 | subsequents are done in cutthrough_multi()), but no way to | |
766 | handle a subsequent because of the RSET vaporising the MAIL FROM. | |
767 | So refuse to support any. Most cutthrough use will not involve | |
768 | random_local_part, so no loss. */ | |
769 | cancel_cutthrough_connection(TRUE, US"random-recipient"); | |
059ec3d9 | 770 | |
e9166683 JH |
771 | addr->address = string_sprintf("%s@%.1000s", |
772 | random_local_part, rcpt_domain); | |
773 | done = FALSE; | |
902fbd69 JH |
774 | |
775 | /* If accepted, we aren't going to do any further tests below. | |
776 | Otherwise, cache a real negative response, and get back to the right | |
777 | state to send RCPT. Unless there's some problem such as a dropped | |
778 | connection, we expect to succeed, because the commands succeeded above. | |
779 | However, some servers drop the connection after responding to an | |
780 | invalid recipient, so on (any) error we drop and remake the connection. | |
781 | XXX We don't care about that for postmaster_full. Should we? | |
782 | ||
783 | XXX could we add another flag to the context, and have the common | |
784 | code emit the RSET too? Even pipelined after the RCPT... | |
785 | Then the main-verify call could use it if there's to be a subsequent | |
786 | postmaster-verify. | |
787 | The sync_responses() would need to be taught about it and we'd | |
788 | need another return code filtering out to here. | |
14de8063 JH |
789 | |
790 | Avoid using a SIZE option on the MAIL for all randon-rcpt checks. | |
902fbd69 JH |
791 | */ |
792 | ||
14de8063 JH |
793 | sx.avoid_option = OPTION_SIZE; |
794 | ||
a65c4156 JH |
795 | /* Remember when we last did a random test */ |
796 | new_domain_record.random_stamp = time(NULL); | |
797 | ||
e9166683 JH |
798 | if (smtp_write_mail_and_rcpt_cmds(&sx, &yield) == 0) |
799 | switch(addr->transport_return) | |
800 | { | |
b6323c75 | 801 | case PENDING_OK: /* random was accepted, unfortunately */ |
e9166683 | 802 | new_domain_record.random_result = ccache_accept; |
b6323c75 | 803 | yield = OK; /* Only usable verify result we can return */ |
fae8970d JH |
804 | done = TRUE; |
805 | goto no_conn; | |
b6323c75 | 806 | case FAIL: /* rejected: the preferred result */ |
e9166683 | 807 | new_domain_record.random_result = ccache_reject; |
14de8063 | 808 | sx.avoid_option = 0; |
193e3acd | 809 | |
e9166683 | 810 | /* Between each check, issue RSET, because some servers accept only |
902fbd69 JH |
811 | one recipient after MAIL FROM:<>. |
812 | XXX We don't care about that for postmaster_full. Should we? */ | |
193e3acd | 813 | |
e9166683 | 814 | if ((done = |
4e910c01 | 815 | smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0 && |
e9166683 JH |
816 | smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), |
817 | '2', callout))) | |
818 | break; | |
65f1c92a | 819 | |
65f1c92a | 820 | HDEBUG(D_acl|D_v) |
e1d04f48 | 821 | debug_printf_indent("problem after random/rset/mfrom; reopen conn\n"); |
65f1c92a JH |
822 | random_local_part = NULL; |
823 | #ifdef SUPPORT_TLS | |
dec766a1 | 824 | tls_close(FALSE, TLS_SHUTDOWN_NOWAIT); |
65f1c92a | 825 | #endif |
e1d04f48 | 826 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); |
02b41d71 | 827 | (void)close(sx.inblock.sock); |
e9166683 | 828 | sx.inblock.sock = sx.outblock.sock = -1; |
0cbf2b82 | 829 | #ifndef DISABLE_EVENT |
65f1c92a JH |
830 | (void) event_raise(addr->transport->event_action, |
831 | US"tcp:close", NULL); | |
832 | #endif | |
a65c4156 JH |
833 | addr->address = main_address; |
834 | addr->transport_return = PENDING_DEFER; | |
835 | sx.first_addr = sx.sync_addr = addr; | |
836 | sx.ok = FALSE; | |
837 | sx.send_rset = TRUE; | |
838 | sx.completed_addr = FALSE; | |
65f1c92a | 839 | goto tls_retry_connection; |
b6323c75 JH |
840 | case DEFER: /* 4xx response to random */ |
841 | break; /* Just to be clear. ccache_unknown, !done. */ | |
e9166683 | 842 | } |
059ec3d9 | 843 | |
e9166683 JH |
844 | /* Re-setup for main verify, or for the error message when failing */ |
845 | addr->address = main_address; | |
846 | addr->transport_return = PENDING_DEFER; | |
847 | sx.first_addr = sx.sync_addr = addr; | |
848 | sx.ok = FALSE; | |
849 | sx.send_rset = TRUE; | |
850 | sx.completed_addr = FALSE; | |
851 | } | |
852 | else | |
853 | done = TRUE; | |
921dfc11 | 854 | |
14de8063 JH |
855 | /* Main verify. For rcpt-verify use SIZE if we know it and we're not cacheing; |
856 | for sndr-verify never use it. */ | |
e9166683 JH |
857 | |
858 | if (done) | |
859 | { | |
14de8063 JH |
860 | if (!(options & vopt_is_recipient && options & vopt_callout_no_cache)) |
861 | sx.avoid_option = OPTION_SIZE; | |
862 | ||
e9166683 JH |
863 | done = FALSE; |
864 | switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield)) | |
865 | { | |
866 | case 0: switch(addr->transport_return) /* ok so far */ | |
867 | { | |
868 | case PENDING_OK: done = TRUE; | |
869 | new_address_record.result = ccache_accept; | |
870 | break; | |
14de8063 | 871 | case FAIL: done = TRUE; |
e9166683 JH |
872 | yield = FAIL; |
873 | *failure_ptr = US"recipient"; | |
874 | new_address_record.result = ccache_reject; | |
875 | break; | |
14de8063 | 876 | default: break; |
e9166683 JH |
877 | } |
878 | break; | |
879 | ||
880 | case -1: /* MAIL response error */ | |
881 | *failure_ptr = US"mail"; | |
882 | if (errno == 0 && sx.buffer[0] == '5') | |
883 | { | |
884 | setflag(addr, af_verify_nsfail); | |
885 | if (from_address[0] == 0) | |
886 | new_domain_record.result = ccache_reject_mfnull; | |
887 | } | |
888 | break; | |
889 | /* non-MAIL read i/o error */ | |
890 | /* non-MAIL response timeout */ | |
891 | /* internal error; channel still usable */ | |
892 | default: break; /* transmit failed */ | |
893 | } | |
894 | } | |
895 | ||
896 | addr->auth_sndr = client_authenticated_sender; | |
897 | ||
898 | deliver_host = deliver_host_address = NULL; | |
899 | deliver_domain = save_deliver_domain; | |
900 | ||
901 | /* Do postmaster check if requested; if a full check is required, we | |
902 | check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */ | |
903 | ||
904 | if (done && pm_mailfrom) | |
905 | { | |
906 | /* Could possibly shift before main verify, just above, and be ok | |
907 | for cutthrough. But no way to handle a subsequent rcpt, so just | |
908 | refuse any */ | |
57cc2785 | 909 | cancel_cutthrough_connection(TRUE, US"postmaster verify"); |
e1d04f48 | 910 | HDEBUG(D_acl|D_v) debug_printf_indent("Cutthrough cancelled by presence of postmaster verify\n"); |
e9166683 | 911 | |
4e910c01 | 912 | done = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0 |
e9166683 JH |
913 | && smtp_read_response(&sx.inblock, sx.buffer, |
914 | sizeof(sx.buffer), '2', callout); | |
915 | ||
916 | if (done) | |
917 | { | |
918 | uschar * main_address = addr->address; | |
919 | ||
920 | /*XXX oops, affixes */ | |
921 | addr->address = string_sprintf("postmaster@%.1000s", addr->domain); | |
922 | addr->transport_return = PENDING_DEFER; | |
923 | ||
924 | sx.from_addr = pm_mailfrom; | |
925 | sx.first_addr = sx.sync_addr = addr; | |
926 | sx.ok = FALSE; | |
927 | sx.send_rset = TRUE; | |
928 | sx.completed_addr = FALSE; | |
14de8063 | 929 | sx.avoid_option = OPTION_SIZE; |
e9166683 JH |
930 | |
931 | if( smtp_write_mail_and_rcpt_cmds(&sx, &yield) == 0 | |
932 | && addr->transport_return == PENDING_OK | |
933 | ) | |
934 | done = TRUE; | |
921dfc11 | 935 | else |
e9166683 | 936 | done = (options & vopt_callout_fullpm) != 0 |
4e910c01 | 937 | && smtp_write_command(&sx.outblock, SCMD_FLUSH, |
e9166683 JH |
938 | "RCPT TO:<postmaster>\r\n") >= 0 |
939 | && smtp_read_response(&sx.inblock, sx.buffer, | |
940 | sizeof(sx.buffer), '2', callout); | |
921dfc11 | 941 | |
e9166683 | 942 | /* Sort out the cache record */ |
2a4be8f9 | 943 | |
e9166683 JH |
944 | new_domain_record.postmaster_stamp = time(NULL); |
945 | ||
946 | if (done) | |
947 | new_domain_record.postmaster_result = ccache_accept; | |
948 | else if (errno == 0 && sx.buffer[0] == '5') | |
949 | { | |
950 | *failure_ptr = US"postmaster"; | |
951 | setflag(addr, af_verify_pmfail); | |
952 | new_domain_record.postmaster_result = ccache_reject; | |
953 | } | |
954 | ||
955 | addr->address = main_address; | |
956 | } | |
957 | } | |
193e3acd JH |
958 | /* For any failure of the main check, other than a negative response, we just |
959 | close the connection and carry on. We can identify a negative response by the | |
960 | fact that errno is zero. For I/O errors it will be non-zero | |
2a4be8f9 | 961 | |
193e3acd JH |
962 | Set up different error texts for logging and for sending back to the caller |
963 | as an SMTP response. Log in all cases, using a one-line format. For sender | |
964 | callouts, give a full response to the caller, but for recipient callouts, | |
965 | don't give the IP address because this may be an internal host whose identity | |
966 | is not to be widely broadcast. */ | |
2a4be8f9 | 967 | |
02b41d71 | 968 | no_conn: |
e9166683 | 969 | switch(errno) |
193e3acd | 970 | { |
02b41d71 JH |
971 | case ETIMEDOUT: |
972 | HDEBUG(D_verify) debug_printf("SMTP timeout\n"); | |
973 | sx.send_quit = FALSE; | |
974 | break; | |
975 | ||
8c5d388a | 976 | #ifdef SUPPORT_I18N |
02b41d71 | 977 | case ERRNO_UTF8_FWD: |
9bfc60eb JH |
978 | { |
979 | extern int acl_where; /* src/acl.c */ | |
980 | errno = 0; | |
981 | addr->message = string_sprintf( | |
e9166683 | 982 | "response to \"EHLO\" did not include SMTPUTF8"); |
02b41d71 JH |
983 | addr->user_message = acl_where == ACL_WHERE_RCPT |
984 | ? US"533 no support for internationalised mailbox name" | |
9bfc60eb JH |
985 | : US"550 mailbox unavailable"; |
986 | yield = FAIL; | |
987 | done = TRUE; | |
988 | } | |
02b41d71 | 989 | break; |
9bfc60eb | 990 | #endif |
02b41d71 JH |
991 | case ECONNREFUSED: |
992 | sx.send_quit = FALSE; | |
993 | break; | |
2a4be8f9 | 994 | |
02b41d71 | 995 | case 0: |
e9166683 | 996 | if (*sx.buffer == 0) Ustrcpy(sx.buffer, US"connection dropped"); |
059ec3d9 | 997 | |
e9166683 | 998 | /*XXX test here is ugly; seem to have a split of responsibility for |
b6323c75 | 999 | building this message. Need to rationalise. Where is it done |
e9166683 JH |
1000 | before here, and when not? |
1001 | Not == 5xx resp to MAIL on main-verify | |
1002 | */ | |
1003 | if (!addr->message) addr->message = | |
1004 | string_sprintf("response to \"%s\" was: %s", | |
1005 | big_buffer, string_printing(sx.buffer)); | |
02b41d71 JH |
1006 | |
1007 | addr->user_message = options & vopt_is_recipient | |
e9166683 | 1008 | ? string_sprintf("Callout verification failed:\n%s", sx.buffer) |
02b41d71 | 1009 | : string_sprintf("Called: %s\nSent: %s\nResponse: %s", |
e9166683 | 1010 | host->address, big_buffer, sx.buffer); |
059ec3d9 | 1011 | |
02b41d71 | 1012 | /* Hard rejection ends the process */ |
193e3acd | 1013 | |
e9166683 | 1014 | if (sx.buffer[0] == '5') /* Address rejected */ |
02b41d71 JH |
1015 | { |
1016 | yield = FAIL; | |
1017 | done = TRUE; | |
1018 | } | |
1019 | break; | |
193e3acd | 1020 | } |
059ec3d9 | 1021 | |
193e3acd JH |
1022 | /* End the SMTP conversation and close the connection. */ |
1023 | ||
4c04137d | 1024 | /* Cutthrough - on a successful connect and recipient-verify with |
5032d1cf | 1025 | use-sender and we are 1st rcpt and have no cutthrough conn so far |
57cc2785 JH |
1026 | here is where we want to leave the conn open. Ditto for a lazy-close |
1027 | verify. */ | |
1028 | ||
1029 | if ( (cutthrough.delivery || options & vopt_callout_hold) | |
5032d1cf | 1030 | && rcpt_count == 1 |
193e3acd JH |
1031 | && done |
1032 | && yield == OK | |
98c82a3d JH |
1033 | && (options & (vopt_callout_recipsender|vopt_callout_recippmaster|vopt_success_on_redirect)) |
1034 | == vopt_callout_recipsender | |
193e3acd JH |
1035 | && !random_local_part |
1036 | && !pm_mailfrom | |
5032d1cf | 1037 | && cutthrough.fd < 0 |
02b41d71 | 1038 | && !sx.lmtp |
193e3acd | 1039 | ) |
059ec3d9 | 1040 | { |
57cc2785 JH |
1041 | HDEBUG(D_acl|D_v) debug_printf_indent("holding verify callout open for %s\n", |
1042 | cutthrough.delivery | |
1043 | ? "cutthrough delivery" : "potential further verifies and delivery"); | |
1044 | ||
1045 | cutthrough.callout_hold_only = !cutthrough.delivery; | |
1046 | cutthrough.is_tls = tls_out.active >= 0; | |
1047 | cutthrough.fd = sx.outblock.sock; /* We assume no buffer in use in the outblock */ | |
1048 | cutthrough.nrcpt = 1; | |
1049 | cutthrough.transport = addr->transport->name; | |
1050 | cutthrough.interface = interface; | |
1051 | cutthrough.snd_port = sending_port; | |
1052 | cutthrough.peer_options = smtp_peer_options; | |
1053 | cutthrough.host = *host; | |
1054 | { | |
1055 | int oldpool = store_pool; | |
1056 | store_pool = POOL_PERM; | |
1057 | cutthrough.snd_ip = string_copy(sending_ip_address); | |
1058 | cutthrough.host.name = string_copy(host->name); | |
1059 | cutthrough.host.address = string_copy(host->address); | |
1060 | store_pool = oldpool; | |
1061 | } | |
1062 | cutthrough.addr = *addr; /* Save the address_item for later logging */ | |
1063 | cutthrough.addr.next = NULL; | |
5032d1cf | 1064 | cutthrough.addr.host_used = &cutthrough.host; |
193e3acd | 1065 | if (addr->parent) |
5032d1cf JH |
1066 | *(cutthrough.addr.parent = store_get(sizeof(address_item))) = |
1067 | *addr->parent; | |
193e3acd JH |
1068 | ctblock.buffer = ctbuffer; |
1069 | ctblock.buffersize = sizeof(ctbuffer); | |
1070 | ctblock.ptr = ctbuffer; | |
1071 | /* ctblock.cmd_count = 0; ctblock.authenticating = FALSE; */ | |
5032d1cf | 1072 | ctblock.sock = cutthrough.fd; |
059ec3d9 | 1073 | } |
193e3acd | 1074 | else |
059ec3d9 | 1075 | { |
57cc2785 | 1076 | /* Ensure no cutthrough on multiple verifies that were incompatible */ |
193e3acd | 1077 | if (options & vopt_callout_recipsender) |
57cc2785 | 1078 | cancel_cutthrough_connection(TRUE, US"not usable for cutthrough"); |
02b41d71 | 1079 | if (sx.send_quit) |
2760b518 | 1080 | { |
4e910c01 | 1081 | (void) smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n"); |
059ec3d9 | 1082 | |
2760b518 | 1083 | /* Wait a short time for response, and discard it */ |
e9166683 | 1084 | smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), |
2760b518 JH |
1085 | '2', 1); |
1086 | } | |
1087 | ||
02b41d71 JH |
1088 | if (sx.inblock.sock >= 0) |
1089 | { | |
a7538db1 | 1090 | #ifdef SUPPORT_TLS |
dec766a1 | 1091 | tls_close(FALSE, TLS_SHUTDOWN_NOWAIT); |
a7538db1 | 1092 | #endif |
e1d04f48 | 1093 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); |
02b41d71 JH |
1094 | (void)close(sx.inblock.sock); |
1095 | sx.inblock.sock = sx.outblock.sock = -1; | |
0cbf2b82 | 1096 | #ifndef DISABLE_EVENT |
02b41d71 | 1097 | (void) event_raise(addr->transport->event_action, US"tcp:close", NULL); |
a7538db1 | 1098 | #endif |
02b41d71 | 1099 | } |
059ec3d9 | 1100 | } |
059ec3d9 | 1101 | |
e9166683 JH |
1102 | if (!done || yield != OK) |
1103 | addr->message = string_sprintf("%s [%s] : %s", host->name, host->address, | |
1104 | addr->message); | |
193e3acd JH |
1105 | } /* Loop through all hosts, while !done */ |
1106 | } | |
059ec3d9 PH |
1107 | |
1108 | /* If we get here with done == TRUE, a successful callout happened, and yield | |
1109 | will be set OK or FAIL according to the response to the RCPT command. | |
1110 | Otherwise, we looped through the hosts but couldn't complete the business. | |
707ee5b1 | 1111 | However, there may be domain-specific information to cache in both cases. */ |
059ec3d9 | 1112 | |
707ee5b1 JH |
1113 | if (!(options & vopt_callout_no_cache)) |
1114 | cache_callout_write(&new_domain_record, addr->domain, | |
1115 | done, &new_address_record, address_key); | |
059ec3d9 PH |
1116 | |
1117 | /* Failure to connect to any host, or any response other than 2xx or 5xx is a | |
1118 | temporary error. If there was only one host, and a response was received, leave | |
1119 | it alone if supplying details. Otherwise, give a generic response. */ | |
1120 | ||
707ee5b1 | 1121 | if (!done) |
059ec3d9 | 1122 | { |
ff5929e3 | 1123 | uschar * dullmsg = string_sprintf("Could not complete %s verify callout", |
8b9476ba | 1124 | options & vopt_is_recipient ? "recipient" : "sender"); |
059ec3d9 PH |
1125 | yield = DEFER; |
1126 | ||
02b41d71 JH |
1127 | addr->message = host_list->next || !addr->message |
1128 | ? dullmsg : string_sprintf("%s: %s", dullmsg, addr->message); | |
059ec3d9 | 1129 | |
ff5929e3 JH |
1130 | addr->user_message = smtp_return_error_details |
1131 | ? string_sprintf("%s for <%s>.\n" | |
059ec3d9 PH |
1132 | "The mail server(s) for the domain may be temporarily unreachable, or\n" |
1133 | "they may be permanently unreachable from this server. In the latter case,\n%s", | |
1134 | dullmsg, addr->address, | |
8b9476ba | 1135 | options & vopt_is_recipient |
ff5929e3 | 1136 | ? "the address will never be accepted." |
8b9476ba JH |
1137 | : "you need to change the address or create an MX record for its domain\n" |
1138 | "if it is supposed to be generally accessible from the Internet.\n" | |
ff5929e3 JH |
1139 | "Talk to your mail administrator for details.") |
1140 | : dullmsg; | |
059ec3d9 PH |
1141 | |
1142 | /* Force a specific error code */ | |
1143 | ||
1144 | addr->basic_errno = ERRNO_CALLOUTDEFER; | |
1145 | } | |
1146 | ||
1147 | /* Come here from within the cache-reading code on fast-track exit. */ | |
1148 | ||
1149 | END_CALLOUT: | |
02b41d71 | 1150 | tls_modify_variables(&tls_in); |
059ec3d9 PH |
1151 | return yield; |
1152 | } | |
1153 | ||
1154 | ||
1155 | ||
817d9f57 JH |
1156 | /* Called after recipient-acl to get a cutthrough connection open when |
1157 | one was requested and a recipient-verify wasn't subsequently done. | |
1158 | */ | |
f9334a28 | 1159 | int |
e4bdf652 JH |
1160 | open_cutthrough_connection( address_item * addr ) |
1161 | { | |
1162 | address_item addr2; | |
f9334a28 | 1163 | int rc; |
e4bdf652 JH |
1164 | |
1165 | /* Use a recipient-verify-callout to set up the cutthrough connection. */ | |
1166 | /* We must use a copy of the address for verification, because it might | |
1167 | get rewritten. */ | |
1168 | ||
1169 | addr2 = *addr; | |
e1d04f48 | 1170 | HDEBUG(D_acl) debug_printf_indent("----------- %s cutthrough setup ------------\n", |
5032d1cf | 1171 | rcpt_count > 1 ? "more" : "start"); |
ff5929e3 | 1172 | rc = verify_address(&addr2, NULL, |
e4bdf652 JH |
1173 | vopt_is_recipient | vopt_callout_recipsender | vopt_callout_no_cache, |
1174 | CUTTHROUGH_CMD_TIMEOUT, -1, -1, | |
1175 | NULL, NULL, NULL); | |
ff5929e3 JH |
1176 | addr->message = addr2.message; |
1177 | addr->user_message = addr2.user_message; | |
e1d04f48 | 1178 | HDEBUG(D_acl) debug_printf_indent("----------- end cutthrough setup ------------\n"); |
f9334a28 | 1179 | return rc; |
e4bdf652 JH |
1180 | } |
1181 | ||
1182 | ||
e4bdf652 | 1183 | |
817d9f57 JH |
1184 | /* Send given number of bytes from the buffer */ |
1185 | static BOOL | |
1186 | cutthrough_send(int n) | |
e4bdf652 | 1187 | { |
5032d1cf | 1188 | if(cutthrough.fd < 0) |
817d9f57 | 1189 | return TRUE; |
e4bdf652 | 1190 | |
817d9f57 JH |
1191 | if( |
1192 | #ifdef SUPPORT_TLS | |
925ac8e4 | 1193 | tls_out.active == cutthrough.fd ? tls_write(FALSE, ctblock.buffer, n, FALSE) : |
817d9f57 | 1194 | #endif |
5032d1cf | 1195 | send(cutthrough.fd, ctblock.buffer, n, 0) > 0 |
817d9f57 JH |
1196 | ) |
1197 | { | |
1198 | transport_count += n; | |
1199 | ctblock.ptr= ctblock.buffer; | |
1200 | return TRUE; | |
1201 | } | |
e4bdf652 | 1202 | |
e1d04f48 | 1203 | HDEBUG(D_transport|D_acl) debug_printf_indent("cutthrough_send failed: %s\n", strerror(errno)); |
817d9f57 | 1204 | return FALSE; |
e4bdf652 JH |
1205 | } |
1206 | ||
1207 | ||
1208 | ||
817d9f57 JH |
1209 | static BOOL |
1210 | _cutthrough_puts(uschar * cp, int n) | |
1211 | { | |
1212 | while(n--) | |
1213 | { | |
1214 | if(ctblock.ptr >= ctblock.buffer+ctblock.buffersize) | |
1215 | if(!cutthrough_send(ctblock.buffersize)) | |
1216 | return FALSE; | |
1217 | ||
1218 | *ctblock.ptr++ = *cp++; | |
1219 | } | |
1220 | return TRUE; | |
1221 | } | |
1222 | ||
1223 | /* Buffered output of counted data block. Return boolean success */ | |
57cc2785 | 1224 | static BOOL |
e4bdf652 JH |
1225 | cutthrough_puts(uschar * cp, int n) |
1226 | { | |
5032d1cf | 1227 | if (cutthrough.fd < 0) return TRUE; |
817d9f57 | 1228 | if (_cutthrough_puts(cp, n)) return TRUE; |
57cc2785 | 1229 | cancel_cutthrough_connection(TRUE, US"transmit failed"); |
817d9f57 JH |
1230 | return FALSE; |
1231 | } | |
e4bdf652 | 1232 | |
6851a9c5 | 1233 | void |
57cc2785 JH |
1234 | cutthrough_data_puts(uschar * cp, int n) |
1235 | { | |
6851a9c5 | 1236 | if (cutthrough.delivery) (void) cutthrough_puts(cp, n); |
78a3bbd5 | 1237 | return; |
57cc2785 JH |
1238 | } |
1239 | ||
e4bdf652 | 1240 | |
817d9f57 | 1241 | static BOOL |
5032d1cf | 1242 | _cutthrough_flush_send(void) |
817d9f57 | 1243 | { |
57cc2785 | 1244 | int n = ctblock.ptr - ctblock.buffer; |
e4bdf652 | 1245 | |
817d9f57 JH |
1246 | if(n>0) |
1247 | if(!cutthrough_send(n)) | |
1248 | return FALSE; | |
1249 | return TRUE; | |
e4bdf652 JH |
1250 | } |
1251 | ||
817d9f57 JH |
1252 | |
1253 | /* Send out any bufferred output. Return boolean success. */ | |
e4bdf652 | 1254 | BOOL |
5032d1cf | 1255 | cutthrough_flush_send(void) |
e4bdf652 | 1256 | { |
817d9f57 | 1257 | if (_cutthrough_flush_send()) return TRUE; |
57cc2785 | 1258 | cancel_cutthrough_connection(TRUE, US"transmit failed"); |
e4bdf652 JH |
1259 | return FALSE; |
1260 | } | |
1261 | ||
1262 | ||
57cc2785 | 1263 | static BOOL |
5032d1cf | 1264 | cutthrough_put_nl(void) |
e4bdf652 JH |
1265 | { |
1266 | return cutthrough_puts(US"\r\n", 2); | |
1267 | } | |
1268 | ||
1269 | ||
6851a9c5 | 1270 | void |
57cc2785 JH |
1271 | cutthrough_data_put_nl(void) |
1272 | { | |
6851a9c5 | 1273 | cutthrough_data_puts(US"\r\n", 2); |
57cc2785 JH |
1274 | } |
1275 | ||
1276 | ||
e4bdf652 JH |
1277 | /* Get and check response from cutthrough target */ |
1278 | static uschar | |
57cc2785 | 1279 | cutthrough_response(int fd, char expect, uschar ** copy, int timeout) |
e4bdf652 JH |
1280 | { |
1281 | smtp_inblock inblock; | |
1282 | uschar inbuffer[4096]; | |
1283 | uschar responsebuffer[4096]; | |
1284 | ||
1285 | inblock.buffer = inbuffer; | |
1286 | inblock.buffersize = sizeof(inbuffer); | |
1287 | inblock.ptr = inbuffer; | |
1288 | inblock.ptrend = inbuffer; | |
57cc2785 | 1289 | inblock.sock = fd; |
817d9f57 | 1290 | /* this relies on (inblock.sock == tls_out.active) */ |
2760b518 | 1291 | if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, timeout)) |
57cc2785 | 1292 | cancel_cutthrough_connection(TRUE, US"target timeout on read"); |
e4bdf652 | 1293 | |
57cc2785 | 1294 | if(copy) |
e4bdf652 JH |
1295 | { |
1296 | uschar * cp; | |
5032d1cf | 1297 | *copy = cp = string_copy(responsebuffer); |
e4bdf652 JH |
1298 | /* Trim the trailing end of line */ |
1299 | cp += Ustrlen(responsebuffer); | |
1300 | if(cp > *copy && cp[-1] == '\n') *--cp = '\0'; | |
1301 | if(cp > *copy && cp[-1] == '\r') *--cp = '\0'; | |
1302 | } | |
1303 | ||
1304 | return responsebuffer[0]; | |
1305 | } | |
1306 | ||
1307 | ||
1308 | /* Negotiate dataphase with the cutthrough target, returning success boolean */ | |
1309 | BOOL | |
5032d1cf | 1310 | cutthrough_predata(void) |
e4bdf652 | 1311 | { |
57cc2785 | 1312 | if(cutthrough.fd < 0 || cutthrough.callout_hold_only) |
e4bdf652 JH |
1313 | return FALSE; |
1314 | ||
e1d04f48 | 1315 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> DATA\n"); |
817d9f57 JH |
1316 | cutthrough_puts(US"DATA\r\n", 6); |
1317 | cutthrough_flush_send(); | |
e4bdf652 JH |
1318 | |
1319 | /* Assume nothing buffered. If it was it gets ignored. */ | |
57cc2785 | 1320 | return cutthrough_response(cutthrough.fd, '3', NULL, CUTTHROUGH_DATA_TIMEOUT) == '3'; |
e4bdf652 JH |
1321 | } |
1322 | ||
1323 | ||
42055a33 | 1324 | /* tctx arg only to match write_chunk() */ |
511a6c14 | 1325 | static BOOL |
42055a33 | 1326 | cutthrough_write_chunk(transport_ctx * tctx, uschar * s, int len) |
511a6c14 JH |
1327 | { |
1328 | uschar * s2; | |
1329 | while(s && (s2 = Ustrchr(s, '\n'))) | |
1330 | { | |
1331 | if(!cutthrough_puts(s, s2-s) || !cutthrough_put_nl()) | |
1332 | return FALSE; | |
1333 | s = s2+1; | |
1334 | } | |
1335 | return TRUE; | |
1336 | } | |
1337 | ||
1338 | ||
e4bdf652 | 1339 | /* Buffered send of headers. Return success boolean. */ |
817d9f57 | 1340 | /* Expands newlines to wire format (CR,NL). */ |
e4bdf652 | 1341 | /* Also sends header-terminating blank line. */ |
e4bdf652 | 1342 | BOOL |
5032d1cf | 1343 | cutthrough_headers_send(void) |
e4bdf652 | 1344 | { |
6d5c916c JH |
1345 | transport_ctx tctx; |
1346 | ||
57cc2785 | 1347 | if(cutthrough.fd < 0 || cutthrough.callout_hold_only) |
e4bdf652 JH |
1348 | return FALSE; |
1349 | ||
511a6c14 JH |
1350 | /* We share a routine with the mainline transport to handle header add/remove/rewrites, |
1351 | but having a separate buffered-output function (for now) | |
1352 | */ | |
e1d04f48 | 1353 | HDEBUG(D_acl) debug_printf_indent("----------- start cutthrough headers send -----------\n"); |
e4bdf652 | 1354 | |
42055a33 | 1355 | tctx.u.fd = cutthrough.fd; |
6d5c916c JH |
1356 | tctx.tblock = cutthrough.addr.transport; |
1357 | tctx.addr = &cutthrough.addr; | |
1358 | tctx.check_string = US"."; | |
1359 | tctx.escape_string = US".."; | |
328c5688 | 1360 | /*XXX check under spool_files_wireformat. Might be irrelevant */ |
6d5c916c JH |
1361 | tctx.options = topt_use_crlf; |
1362 | ||
42055a33 | 1363 | if (!transport_headers_send(&tctx, &cutthrough_write_chunk)) |
511a6c14 JH |
1364 | return FALSE; |
1365 | ||
e1d04f48 | 1366 | HDEBUG(D_acl) debug_printf_indent("----------- done cutthrough headers send ------------\n"); |
511a6c14 | 1367 | return TRUE; |
817d9f57 JH |
1368 | } |
1369 | ||
1370 | ||
1371 | static void | |
78a3bbd5 | 1372 | close_cutthrough_connection(const uschar * why) |
817d9f57 | 1373 | { |
57cc2785 JH |
1374 | int fd = cutthrough.fd; |
1375 | if(fd >= 0) | |
817d9f57 JH |
1376 | { |
1377 | /* We could be sending this after a bunch of data, but that is ok as | |
1378 | the only way to cancel the transfer in dataphase is to drop the tcp | |
1379 | conn before the final dot. | |
1380 | */ | |
1381 | ctblock.ptr = ctbuffer; | |
e1d04f48 | 1382 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n"); |
817d9f57 JH |
1383 | _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */ |
1384 | _cutthrough_flush_send(); | |
57cc2785 | 1385 | cutthrough.fd = -1; /* avoid recursion via read timeout */ |
06fdb9f7 | 1386 | cutthrough.nrcpt = 0; /* permit re-cutthrough on subsequent message */ |
2760b518 JH |
1387 | |
1388 | /* Wait a short time for response, and discard it */ | |
57cc2785 | 1389 | cutthrough_response(fd, '2', NULL, 1); |
817d9f57 | 1390 | |
57cc2785 | 1391 | #ifdef SUPPORT_TLS |
dec766a1 | 1392 | tls_close(FALSE, TLS_SHUTDOWN_NOWAIT); |
57cc2785 | 1393 | #endif |
e1d04f48 | 1394 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); |
57cc2785 | 1395 | (void)close(fd); |
e1d04f48 | 1396 | HDEBUG(D_acl) debug_printf_indent("----------- cutthrough shutdown (%s) ------------\n", why); |
817d9f57 JH |
1397 | } |
1398 | ctblock.ptr = ctbuffer; | |
e4bdf652 JH |
1399 | } |
1400 | ||
817d9f57 | 1401 | void |
57cc2785 JH |
1402 | cancel_cutthrough_connection(BOOL close_noncutthrough_verifies, const uschar * why) |
1403 | { | |
1404 | if (cutthrough.delivery || close_noncutthrough_verifies) | |
1405 | close_cutthrough_connection(why); | |
1406 | cutthrough.delivery = cutthrough.callout_hold_only = FALSE; | |
1407 | } | |
1408 | ||
1409 | ||
1410 | void | |
1411 | release_cutthrough_connection(const uschar * why) | |
817d9f57 | 1412 | { |
5ea5d64c | 1413 | if (cutthrough.fd < 0) return; |
57cc2785 JH |
1414 | HDEBUG(D_acl) debug_printf_indent("release cutthrough conn: %s\n", why); |
1415 | cutthrough.fd = -1; | |
1416 | cutthrough.delivery = cutthrough.callout_hold_only = FALSE; | |
817d9f57 JH |
1417 | } |
1418 | ||
1419 | ||
1420 | ||
e4bdf652 JH |
1421 | |
1422 | /* Have senders final-dot. Send one to cutthrough target, and grab the response. | |
1423 | Log an OK response as a transmission. | |
817d9f57 | 1424 | Close the connection. |
e4bdf652 | 1425 | Return smtp response-class digit. |
e4bdf652 JH |
1426 | */ |
1427 | uschar * | |
5032d1cf | 1428 | cutthrough_finaldot(void) |
e4bdf652 | 1429 | { |
5032d1cf JH |
1430 | uschar res; |
1431 | address_item * addr; | |
e1d04f48 | 1432 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> .\n"); |
e4bdf652 JH |
1433 | |
1434 | /* Assume data finshed with new-line */ | |
5032d1cf JH |
1435 | if( !cutthrough_puts(US".", 1) |
1436 | || !cutthrough_put_nl() | |
1437 | || !cutthrough_flush_send() | |
1438 | ) | |
1439 | return cutthrough.addr.message; | |
e4bdf652 | 1440 | |
57cc2785 | 1441 | res = cutthrough_response(cutthrough.fd, '2', &cutthrough.addr.message, CUTTHROUGH_DATA_TIMEOUT); |
5032d1cf | 1442 | for (addr = &cutthrough.addr; addr; addr = addr->next) |
817d9f57 | 1443 | { |
5032d1cf JH |
1444 | addr->message = cutthrough.addr.message; |
1445 | switch(res) | |
1446 | { | |
1447 | case '2': | |
1448 | delivery_log(LOG_MAIN, addr, (int)'>', NULL); | |
78a3bbd5 | 1449 | close_cutthrough_connection(US"delivered"); |
5032d1cf | 1450 | break; |
817d9f57 | 1451 | |
5032d1cf JH |
1452 | case '4': |
1453 | delivery_log(LOG_MAIN, addr, 0, | |
1454 | US"tmp-reject from cutthrough after DATA:"); | |
1455 | break; | |
e4bdf652 | 1456 | |
5032d1cf JH |
1457 | case '5': |
1458 | delivery_log(LOG_MAIN|LOG_REJECT, addr, 0, | |
1459 | US"rejected after DATA:"); | |
1460 | break; | |
e4bdf652 | 1461 | |
5032d1cf JH |
1462 | default: |
1463 | break; | |
1464 | } | |
817d9f57 | 1465 | } |
5032d1cf | 1466 | return cutthrough.addr.message; |
e4bdf652 JH |
1467 | } |
1468 | ||
1469 | ||
817d9f57 | 1470 | |
059ec3d9 PH |
1471 | /************************************************* |
1472 | * Copy error to toplevel address * | |
1473 | *************************************************/ | |
1474 | ||
1475 | /* This function is used when a verify fails or defers, to ensure that the | |
1476 | failure or defer information is in the original toplevel address. This applies | |
1477 | when an address is redirected to a single new address, and the failure or | |
1478 | deferral happens to the child address. | |
1479 | ||
1480 | Arguments: | |
1481 | vaddr the verify address item | |
1482 | addr the final address item | |
1483 | yield FAIL or DEFER | |
1484 | ||
1485 | Returns: the value of YIELD | |
1486 | */ | |
1487 | ||
1488 | static int | |
1489 | copy_error(address_item *vaddr, address_item *addr, int yield) | |
1490 | { | |
1491 | if (addr != vaddr) | |
1492 | { | |
1493 | vaddr->message = addr->message; | |
1494 | vaddr->user_message = addr->user_message; | |
1495 | vaddr->basic_errno = addr->basic_errno; | |
1496 | vaddr->more_errno = addr->more_errno; | |
d43cbe25 | 1497 | vaddr->prop.address_data = addr->prop.address_data; |
42855d71 | 1498 | copyflag(vaddr, addr, af_pass_message); |
059ec3d9 PH |
1499 | } |
1500 | return yield; | |
1501 | } | |
1502 | ||
1503 | ||
1504 | ||
1505 | ||
ce552449 NM |
1506 | /************************************************** |
1507 | * printf that automatically handles TLS if needed * | |
1508 | ***************************************************/ | |
1509 | ||
1510 | /* This function is used by verify_address() as a substitute for all fprintf() | |
1511 | calls; a direct fprintf() will not produce output in a TLS SMTP session, such | |
1512 | as a response to an EXPN command. smtp_in.c makes smtp_printf available but | |
1513 | that assumes that we always use the smtp_out FILE* when not using TLS or the | |
1514 | ssl buffer when we are. Instead we take a FILE* parameter and check to see if | |
1515 | that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular | |
1516 | fprintf(). | |
1517 | ||
1518 | Arguments: | |
1519 | f the candidate FILE* to write to | |
1520 | format format string | |
1521 | ... optional arguments | |
1522 | ||
1523 | Returns: | |
1524 | nothing | |
1525 | */ | |
1526 | ||
1527 | static void PRINTF_FUNCTION(2,3) | |
1ba28e2b | 1528 | respond_printf(FILE *f, const char *format, ...) |
ce552449 NM |
1529 | { |
1530 | va_list ap; | |
1531 | ||
1532 | va_start(ap, format); | |
1533 | if (smtp_out && (f == smtp_out)) | |
925ac8e4 | 1534 | smtp_vprintf(format, FALSE, ap); |
ce552449 | 1535 | else |
513afc6a | 1536 | vfprintf(f, format, ap); |
ce552449 NM |
1537 | va_end(ap); |
1538 | } | |
1539 | ||
1540 | ||
1541 | ||
059ec3d9 PH |
1542 | /************************************************* |
1543 | * Verify an email address * | |
1544 | *************************************************/ | |
1545 | ||
1546 | /* This function is used both for verification (-bv and at other times) and | |
1547 | address testing (-bt), which is indicated by address_test_mode being set. | |
1548 | ||
1549 | Arguments: | |
1550 | vaddr contains the address to verify; the next field in this block | |
1551 | must be NULL | |
1552 | f if not NULL, write the result to this file | |
1553 | options various option bits: | |
1554 | vopt_fake_sender => this sender verify is not for the real | |
1555 | sender (it was verify=sender=xxxx or an address from a | |
1556 | header line) - rewriting must not change sender_address | |
1557 | vopt_is_recipient => this is a recipient address, otherwise | |
1558 | it's a sender address - this affects qualification and | |
1559 | rewriting and messages from callouts | |
1560 | vopt_qualify => qualify an unqualified address; else error | |
1561 | vopt_expn => called from SMTP EXPN command | |
eafd343b TK |
1562 | vopt_success_on_redirect => when a new address is generated |
1563 | the verification instantly succeeds | |
059ec3d9 PH |
1564 | |
1565 | These ones are used by do_callout() -- the options variable | |
1566 | is passed to it. | |
1567 | ||
2a4be8f9 | 1568 | vopt_callout_fullpm => if postmaster check, do full one |
059ec3d9 PH |
1569 | vopt_callout_no_cache => don't use callout cache |
1570 | vopt_callout_random => do the "random" thing | |
1571 | vopt_callout_recipsender => use real sender for recipient | |
1572 | vopt_callout_recippmaster => use postmaster for recipient | |
1573 | ||
1574 | callout if > 0, specifies that callout is required, and gives timeout | |
4deaf07d | 1575 | for individual commands |
059ec3d9 PH |
1576 | callout_overall if > 0, gives overall timeout for the callout function; |
1577 | if < 0, a default is used (see do_callout()) | |
8e669ac1 | 1578 | callout_connect the connection timeout for callouts |
059ec3d9 PH |
1579 | se_mailfrom when callout is requested to verify a sender, use this |
1580 | in MAIL FROM; NULL => "" | |
1581 | pm_mailfrom when callout is requested, if non-NULL, do the postmaster | |
1582 | thing and use this as the sender address (may be "") | |
1583 | ||
1584 | routed if not NULL, set TRUE if routing succeeded, so we can | |
1585 | distinguish between routing failed and callout failed | |
1586 | ||
1587 | Returns: OK address verified | |
1588 | FAIL address failed to verify | |
1589 | DEFER can't tell at present | |
1590 | */ | |
1591 | ||
1592 | int | |
1593 | verify_address(address_item *vaddr, FILE *f, int options, int callout, | |
8e669ac1 | 1594 | int callout_overall, int callout_connect, uschar *se_mailfrom, |
4deaf07d | 1595 | uschar *pm_mailfrom, BOOL *routed) |
059ec3d9 PH |
1596 | { |
1597 | BOOL allok = TRUE; | |
1598 | BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0); | |
059ec3d9 | 1599 | BOOL expn = (options & vopt_expn) != 0; |
eafd343b | 1600 | BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0; |
059ec3d9 PH |
1601 | int i; |
1602 | int yield = OK; | |
1603 | int verify_type = expn? v_expn : | |
1604 | address_test_mode? v_none : | |
8b9476ba | 1605 | options & vopt_is_recipient? v_recipient : v_sender; |
059ec3d9 PH |
1606 | address_item *addr_list; |
1607 | address_item *addr_new = NULL; | |
1608 | address_item *addr_remote = NULL; | |
1609 | address_item *addr_local = NULL; | |
1610 | address_item *addr_succeed = NULL; | |
8b9476ba JH |
1611 | uschar **failure_ptr = options & vopt_is_recipient |
1612 | ? &recipient_verify_failure : &sender_verify_failure; | |
059ec3d9 PH |
1613 | uschar *ko_prefix, *cr; |
1614 | uschar *address = vaddr->address; | |
1615 | uschar *save_sender; | |
1616 | uschar null_sender[] = { 0 }; /* Ensure writeable memory */ | |
1617 | ||
2c7db3f5 PH |
1618 | /* Clear, just in case */ |
1619 | ||
1620 | *failure_ptr = NULL; | |
1621 | ||
059ec3d9 PH |
1622 | /* Set up a prefix and suffix for error message which allow us to use the same |
1623 | output statements both in EXPN mode (where an SMTP response is needed) and when | |
1624 | debugging with an output file. */ | |
1625 | ||
1626 | if (expn) | |
1627 | { | |
1628 | ko_prefix = US"553 "; | |
1629 | cr = US"\r"; | |
1630 | } | |
1631 | else ko_prefix = cr = US""; | |
1632 | ||
1633 | /* Add qualify domain if permitted; otherwise an unqualified address fails. */ | |
1634 | ||
1635 | if (parse_find_at(address) == NULL) | |
1636 | { | |
1637 | if ((options & vopt_qualify) == 0) | |
1638 | { | |
1639 | if (f != NULL) | |
ce552449 NM |
1640 | respond_printf(f, "%sA domain is required for \"%s\"%s\n", |
1641 | ko_prefix, address, cr); | |
8e669ac1 | 1642 | *failure_ptr = US"qualify"; |
059ec3d9 PH |
1643 | return FAIL; |
1644 | } | |
8b9476ba | 1645 | address = rewrite_address_qualify(address, options & vopt_is_recipient); |
059ec3d9 PH |
1646 | } |
1647 | ||
1648 | DEBUG(D_verify) | |
1649 | { | |
1650 | debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1651 | debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address); | |
1652 | } | |
1653 | ||
1654 | /* Rewrite and report on it. Clear the domain and local part caches - these | |
1655 | may have been set by domains and local part tests during an ACL. */ | |
1656 | ||
1657 | if (global_rewrite_rules != NULL) | |
1658 | { | |
1659 | uschar *old = address; | |
8b9476ba | 1660 | address = rewrite_address(address, options & vopt_is_recipient, FALSE, |
059ec3d9 PH |
1661 | global_rewrite_rules, rewrite_existflags); |
1662 | if (address != old) | |
1663 | { | |
1664 | for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0; | |
1665 | for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0; | |
1666 | if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address); | |
1667 | } | |
1668 | } | |
1669 | ||
1670 | /* If this is the real sender address, we must update sender_address at | |
1671 | this point, because it may be referred to in the routers. */ | |
1672 | ||
1673 | if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0) | |
1674 | sender_address = address; | |
1675 | ||
1676 | /* If the address was rewritten to <> no verification can be done, and we have | |
1677 | to return OK. This rewriting is permitted only for sender addresses; for other | |
1678 | addresses, such rewriting fails. */ | |
1679 | ||
1680 | if (address[0] == 0) return OK; | |
1681 | ||
d9b2312b JH |
1682 | /* Flip the legacy TLS-related variables over to the outbound set in case |
1683 | they're used in the context of a transport used by verification. Reset them | |
ea90b718 | 1684 | at exit from this routine (so no returns allowed from here on). */ |
d9b2312b | 1685 | |
35aba663 | 1686 | tls_modify_variables(&tls_out); |
d9b2312b | 1687 | |
059ec3d9 PH |
1688 | /* Save a copy of the sender address for re-instating if we change it to <> |
1689 | while verifying a sender address (a nice bit of self-reference there). */ | |
1690 | ||
1691 | save_sender = sender_address; | |
1692 | ||
ea90b718 JH |
1693 | /* Observability variable for router/transport use */ |
1694 | ||
8b9476ba | 1695 | verify_mode = options & vopt_is_recipient ? US"R" : US"S"; |
ea90b718 | 1696 | |
059ec3d9 PH |
1697 | /* Update the address structure with the possibly qualified and rewritten |
1698 | address. Set it up as the starting address on the chain of new addresses. */ | |
1699 | ||
1700 | vaddr->address = address; | |
1701 | addr_new = vaddr; | |
1702 | ||
1703 | /* We need a loop, because an address can generate new addresses. We must also | |
1704 | cope with generated pipes and files at the top level. (See also the code and | |
1705 | comment in deliver.c.) However, it is usually the case that the router for | |
1706 | user's .forward files has its verify flag turned off. | |
1707 | ||
1708 | If an address generates more than one child, the loop is used only when | |
1709 | full_info is set, and this can only be set locally. Remote enquiries just get | |
1710 | information about the top level address, not anything that it generated. */ | |
1711 | ||
ea90b718 | 1712 | while (addr_new) |
059ec3d9 PH |
1713 | { |
1714 | int rc; | |
1715 | address_item *addr = addr_new; | |
1716 | ||
1717 | addr_new = addr->next; | |
1718 | addr->next = NULL; | |
1719 | ||
1720 | DEBUG(D_verify) | |
1721 | { | |
1722 | debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); | |
1723 | debug_printf("Considering %s\n", addr->address); | |
1724 | } | |
1725 | ||
1726 | /* Handle generated pipe, file or reply addresses. We don't get these | |
1727 | when handling EXPN, as it does only one level of expansion. */ | |
1728 | ||
1729 | if (testflag(addr, af_pfr)) | |
1730 | { | |
1731 | allok = FALSE; | |
1732 | if (f != NULL) | |
1733 | { | |
1734 | BOOL allow; | |
1735 | ||
1736 | if (addr->address[0] == '>') | |
1737 | { | |
1738 | allow = testflag(addr, af_allow_reply); | |
1739 | fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1); | |
1740 | } | |
1741 | else | |
1742 | { | |
1743 | allow = (addr->address[0] == '|')? | |
1744 | testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file); | |
1745 | fprintf(f, "%s -> %s", addr->parent->address, addr->address); | |
1746 | } | |
1747 | ||
1748 | if (addr->basic_errno == ERRNO_BADTRANSPORT) | |
1749 | fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n" | |
1750 | "%s\n", addr->message); | |
1751 | else if (allow) | |
1752 | fprintf(f, "\n transport = %s\n", addr->transport->name); | |
1753 | else | |
1754 | fprintf(f, " *** forbidden ***\n"); | |
1755 | } | |
1756 | continue; | |
1757 | } | |
1758 | ||
1759 | /* Just in case some router parameter refers to it. */ | |
1760 | ||
2f682e45 JH |
1761 | return_path = addr->prop.errors_address |
1762 | ? addr->prop.errors_address : sender_address; | |
059ec3d9 PH |
1763 | |
1764 | /* Split the address into domain and local part, handling the %-hack if | |
1765 | necessary, and then route it. While routing a sender address, set | |
1766 | $sender_address to <> because that is what it will be if we were trying to | |
1767 | send a bounce to the sender. */ | |
1768 | ||
2f682e45 | 1769 | if (routed) *routed = FALSE; |
059ec3d9 PH |
1770 | if ((rc = deliver_split_address(addr)) == OK) |
1771 | { | |
8b9476ba | 1772 | if (!(options & vopt_is_recipient)) sender_address = null_sender; |
059ec3d9 PH |
1773 | rc = route_address(addr, &addr_local, &addr_remote, &addr_new, |
1774 | &addr_succeed, verify_type); | |
1775 | sender_address = save_sender; /* Put back the real sender */ | |
1776 | } | |
1777 | ||
1778 | /* If routing an address succeeded, set the flag that remembers, for use when | |
1779 | an ACL cached a sender verify (in case a callout fails). Then if routing set | |
1780 | up a list of hosts or the transport has a host list, and the callout option | |
1781 | is set, and we aren't in a host checking run, do the callout verification, | |
1782 | and set another flag that notes that a callout happened. */ | |
1783 | ||
1784 | if (rc == OK) | |
1785 | { | |
2f682e45 | 1786 | if (routed) *routed = TRUE; |
059ec3d9 PH |
1787 | if (callout > 0) |
1788 | { | |
08f3b11b | 1789 | transport_instance * tp; |
2f682e45 | 1790 | host_item * host_list = addr->host_list; |
059ec3d9 | 1791 | |
26da7e20 PH |
1792 | /* Make up some data for use in the case where there is no remote |
1793 | transport. */ | |
1794 | ||
1795 | transport_feedback tf = { | |
f2ed27cf JH |
1796 | .interface = NULL, /* interface (=> any) */ |
1797 | .port = US"smtp", | |
1798 | .protocol = US"smtp", | |
1799 | .hosts = NULL, | |
1800 | .helo_data = US"$smtp_active_hostname", | |
1801 | .hosts_override = FALSE, | |
1802 | .hosts_randomize = FALSE, | |
1803 | .gethostbyname = FALSE, | |
1804 | .qualify_single = TRUE, | |
1805 | .search_parents = FALSE | |
26da7e20 | 1806 | }; |
059ec3d9 PH |
1807 | |
1808 | /* If verification yielded a remote transport, we want to use that | |
1809 | transport's options, so as to mimic what would happen if we were really | |
1810 | sending a message to this address. */ | |
1811 | ||
08f3b11b | 1812 | if ((tp = addr->transport) && !tp->info->local) |
059ec3d9 | 1813 | { |
08f3b11b | 1814 | (void)(tp->setup)(tp, addr, &tf, 0, 0, NULL); |
059ec3d9 PH |
1815 | |
1816 | /* If the transport has hosts and the router does not, or if the | |
1817 | transport is configured to override the router's hosts, we must build a | |
1818 | host list of the transport's hosts, and find the IP addresses */ | |
1819 | ||
2f682e45 | 1820 | if (tf.hosts && (!host_list || tf.hosts_override)) |
059ec3d9 PH |
1821 | { |
1822 | uschar *s; | |
55414b25 | 1823 | const uschar *save_deliver_domain = deliver_domain; |
750af86e | 1824 | uschar *save_deliver_localpart = deliver_localpart; |
059ec3d9 PH |
1825 | |
1826 | host_list = NULL; /* Ignore the router's hosts */ | |
1827 | ||
1828 | deliver_domain = addr->domain; | |
1829 | deliver_localpart = addr->local_part; | |
1830 | s = expand_string(tf.hosts); | |
750af86e PH |
1831 | deliver_domain = save_deliver_domain; |
1832 | deliver_localpart = save_deliver_localpart; | |
059ec3d9 | 1833 | |
2f682e45 | 1834 | if (!s) |
059ec3d9 PH |
1835 | { |
1836 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts " | |
1837 | "\"%s\" in %s transport for callout: %s", tf.hosts, | |
08f3b11b | 1838 | tp->name, expand_string_message); |
059ec3d9 PH |
1839 | } |
1840 | else | |
1841 | { | |
322050c2 | 1842 | int flags; |
d8ef3577 | 1843 | host_item *host, *nexthost; |
059ec3d9 PH |
1844 | host_build_hostlist(&host_list, s, tf.hosts_randomize); |
1845 | ||
1846 | /* Just ignore failures to find a host address. If we don't manage | |
8e669ac1 PH |
1847 | to find any addresses, the callout will defer. Note that more than |
1848 | one address may be found for a single host, which will result in | |
1849 | additional host items being inserted into the chain. Hence we must | |
d8ef3577 | 1850 | save the next host first. */ |
059ec3d9 | 1851 | |
66387a73 | 1852 | flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA; |
322050c2 PH |
1853 | if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; |
1854 | if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS; | |
1855 | ||
2f682e45 | 1856 | for (host = host_list; host; host = nexthost) |
059ec3d9 | 1857 | { |
d8ef3577 | 1858 | nexthost = host->next; |
8e669ac1 | 1859 | if (tf.gethostbyname || |
7e66e54d | 1860 | string_is_ip_address(host->name, NULL) != 0) |
55414b25 | 1861 | (void)host_find_byname(host, NULL, flags, NULL, TRUE); |
059ec3d9 | 1862 | else |
9d9c3746 | 1863 | { |
7cd171b7 | 1864 | dnssec_domains * dnssec_domains = NULL; |
08f3b11b | 1865 | if (Ustrcmp(tp->driver_name, "smtp") == 0) |
9d9c3746 JH |
1866 | { |
1867 | smtp_transport_options_block * ob = | |
08f3b11b | 1868 | (smtp_transport_options_block *) tp->options_block; |
7cd171b7 | 1869 | dnssec_domains = &ob->dnssec; |
9d9c3746 JH |
1870 | } |
1871 | ||
2546388c | 1872 | (void) host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
7cd171b7 | 1873 | dnssec_domains, NULL, NULL); |
9d9c3746 | 1874 | } |
059ec3d9 PH |
1875 | } |
1876 | } | |
1877 | } | |
1878 | } | |
1879 | ||
8e669ac1 | 1880 | /* Can only do a callout if we have at least one host! If the callout |
2c7db3f5 | 1881 | fails, it will have set ${sender,recipient}_verify_failure. */ |
059ec3d9 | 1882 | |
2f682e45 | 1883 | if (host_list) |
059ec3d9 PH |
1884 | { |
1885 | HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n"); | |
1886 | if (host_checking && !host_checking_callout) | |
1887 | { | |
1888 | HDEBUG(D_verify) | |
1889 | debug_printf("... callout omitted by default when host testing\n" | |
1890 | "(Use -bhc if you want the callouts to happen.)\n"); | |
1891 | } | |
1892 | else | |
1893 | { | |
4ed8d31a JH |
1894 | #ifdef SUPPORT_TLS |
1895 | deliver_set_expansions(addr); | |
1896 | #endif | |
059ec3d9 | 1897 | rc = do_callout(addr, host_list, &tf, callout, callout_overall, |
4deaf07d | 1898 | callout_connect, options, se_mailfrom, pm_mailfrom); |
059ec3d9 PH |
1899 | } |
1900 | } | |
1901 | else | |
1902 | { | |
1903 | HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor " | |
1904 | "transport provided a host list\n"); | |
1905 | } | |
1906 | } | |
1907 | } | |
8e669ac1 | 1908 | |
2c7db3f5 | 1909 | /* Otherwise, any failure is a routing failure */ |
8e669ac1 PH |
1910 | |
1911 | else *failure_ptr = US"route"; | |
059ec3d9 PH |
1912 | |
1913 | /* A router may return REROUTED if it has set up a child address as a result | |
1914 | of a change of domain name (typically from widening). In this case we always | |
1915 | want to continue to verify the new child. */ | |
1916 | ||
1917 | if (rc == REROUTED) continue; | |
8e669ac1 | 1918 | |
059ec3d9 PH |
1919 | /* Handle hard failures */ |
1920 | ||
1921 | if (rc == FAIL) | |
1922 | { | |
1923 | allok = FALSE; | |
2f682e45 | 1924 | if (f) |
059ec3d9 | 1925 | { |
e6f6568e PH |
1926 | address_item *p = addr->parent; |
1927 | ||
ce552449 | 1928 | respond_printf(f, "%s%s %s", ko_prefix, |
2f682e45 JH |
1929 | full_info ? addr->address : address, |
1930 | address_test_mode ? "is undeliverable" : "failed to verify"); | |
059ec3d9 PH |
1931 | if (!expn && admin_user) |
1932 | { | |
1933 | if (addr->basic_errno > 0) | |
ce552449 | 1934 | respond_printf(f, ": %s", strerror(addr->basic_errno)); |
2f682e45 | 1935 | if (addr->message) |
ce552449 | 1936 | respond_printf(f, ": %s", addr->message); |
e6f6568e PH |
1937 | } |
1938 | ||
1939 | /* Show parents iff doing full info */ | |
1940 | ||
2f682e45 | 1941 | if (full_info) while (p) |
e6f6568e | 1942 | { |
ce552449 | 1943 | respond_printf(f, "%s\n <-- %s", cr, p->address); |
e6f6568e | 1944 | p = p->parent; |
059ec3d9 | 1945 | } |
ce552449 | 1946 | respond_printf(f, "%s\n", cr); |
059ec3d9 | 1947 | } |
57cc2785 | 1948 | cancel_cutthrough_connection(TRUE, US"routing hard fail"); |
059ec3d9 | 1949 | |
d9b2312b | 1950 | if (!full_info) |
2f682e45 | 1951 | { |
d9b2312b JH |
1952 | yield = copy_error(vaddr, addr, FAIL); |
1953 | goto out; | |
2f682e45 JH |
1954 | } |
1955 | yield = FAIL; | |
059ec3d9 PH |
1956 | } |
1957 | ||
1958 | /* Soft failure */ | |
1959 | ||
1960 | else if (rc == DEFER) | |
1961 | { | |
1962 | allok = FALSE; | |
2f682e45 | 1963 | if (f) |
059ec3d9 | 1964 | { |
e6f6568e | 1965 | address_item *p = addr->parent; |
ce552449 | 1966 | respond_printf(f, "%s%s cannot be resolved at this time", ko_prefix, |
322050c2 | 1967 | full_info? addr->address : address); |
059ec3d9 PH |
1968 | if (!expn && admin_user) |
1969 | { | |
1970 | if (addr->basic_errno > 0) | |
ce552449 | 1971 | respond_printf(f, ": %s", strerror(addr->basic_errno)); |
2f682e45 | 1972 | if (addr->message) |
ce552449 | 1973 | respond_printf(f, ": %s", addr->message); |
059ec3d9 | 1974 | else if (addr->basic_errno <= 0) |
ce552449 | 1975 | respond_printf(f, ": unknown error"); |
059ec3d9 PH |
1976 | } |
1977 | ||
e6f6568e PH |
1978 | /* Show parents iff doing full info */ |
1979 | ||
2f682e45 | 1980 | if (full_info) while (p) |
e6f6568e | 1981 | { |
ce552449 | 1982 | respond_printf(f, "%s\n <-- %s", cr, p->address); |
e6f6568e PH |
1983 | p = p->parent; |
1984 | } | |
ce552449 | 1985 | respond_printf(f, "%s\n", cr); |
059ec3d9 | 1986 | } |
57cc2785 | 1987 | cancel_cutthrough_connection(TRUE, US"routing soft fail"); |
e4bdf652 | 1988 | |
d9b2312b JH |
1989 | if (!full_info) |
1990 | { | |
1991 | yield = copy_error(vaddr, addr, DEFER); | |
1992 | goto out; | |
1993 | } | |
2f682e45 | 1994 | if (yield == OK) yield = DEFER; |
059ec3d9 PH |
1995 | } |
1996 | ||
1997 | /* If we are handling EXPN, we do not want to continue to route beyond | |
e6f6568e | 1998 | the top level (whose address is in "address"). */ |
059ec3d9 PH |
1999 | |
2000 | else if (expn) | |
2001 | { | |
2002 | uschar *ok_prefix = US"250-"; | |
2f682e45 JH |
2003 | |
2004 | if (!addr_new) | |
2005 | if (!addr_local && !addr_remote) | |
ce552449 | 2006 | respond_printf(f, "250 mail to <%s> is discarded\r\n", address); |
059ec3d9 | 2007 | else |
ce552449 | 2008 | respond_printf(f, "250 <%s>\r\n", address); |
2f682e45 JH |
2009 | |
2010 | else do | |
059ec3d9 PH |
2011 | { |
2012 | address_item *addr2 = addr_new; | |
2013 | addr_new = addr2->next; | |
2f682e45 | 2014 | if (!addr_new) ok_prefix = US"250 "; |
ce552449 | 2015 | respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address); |
2f682e45 | 2016 | } while (addr_new); |
d9b2312b JH |
2017 | yield = OK; |
2018 | goto out; | |
059ec3d9 PH |
2019 | } |
2020 | ||
2021 | /* Successful routing other than EXPN. */ | |
2022 | ||
2023 | else | |
2024 | { | |
2025 | /* Handle successful routing when short info wanted. Otherwise continue for | |
2026 | other (generated) addresses. Short info is the operational case. Full info | |
2027 | can be requested only when debug_selector != 0 and a file is supplied. | |
2028 | ||
2029 | There is a conflict between the use of aliasing as an alternate email | |
2030 | address, and as a sort of mailing list. If an alias turns the incoming | |
2031 | address into just one address (e.g. J.Caesar->jc44) you may well want to | |
2032 | carry on verifying the generated address to ensure it is valid when | |
2033 | checking incoming mail. If aliasing generates multiple addresses, you | |
2034 | probably don't want to do this. Exim therefore treats the generation of | |
2035 | just a single new address as a special case, and continues on to verify the | |
2036 | generated address. */ | |
2037 | ||
2f682e45 JH |
2038 | if ( !full_info /* Stop if short info wanted AND */ |
2039 | && ( ( !addr_new /* No new address OR */ | |
2040 | || addr_new->next /* More than one new address OR */ | |
2041 | || testflag(addr_new, af_pfr) /* New address is pfr */ | |
2042 | ) | |
2043 | || /* OR */ | |
2044 | ( addr_new /* At least one new address AND */ | |
2045 | && success_on_redirect /* success_on_redirect is set */ | |
2046 | ) ) | |
2047 | ) | |
059ec3d9 | 2048 | { |
2f682e45 JH |
2049 | if (f) fprintf(f, "%s %s\n", |
2050 | address, address_test_mode ? "is deliverable" : "verified"); | |
059ec3d9 PH |
2051 | |
2052 | /* If we have carried on to verify a child address, we want the value | |
2053 | of $address_data to be that of the child */ | |
2054 | ||
d43cbe25 | 2055 | vaddr->prop.address_data = addr->prop.address_data; |
98c82a3d JH |
2056 | |
2057 | /* If stopped because more than one new address, cannot cutthrough */ | |
2058 | ||
2059 | if (addr_new && addr_new->next) | |
57cc2785 | 2060 | cancel_cutthrough_connection(TRUE, US"multiple addresses from routing"); |
98c82a3d | 2061 | |
d9b2312b JH |
2062 | yield = OK; |
2063 | goto out; | |
059ec3d9 PH |
2064 | } |
2065 | } | |
2066 | } /* Loop for generated addresses */ | |
2067 | ||
2068 | /* Display the full results of the successful routing, including any generated | |
2069 | addresses. Control gets here only when full_info is set, which requires f not | |
2070 | to be NULL, and this occurs only when a top-level verify is called with the | |
2071 | debugging switch on. | |
2072 | ||
2073 | If there are no local and no remote addresses, and there were no pipes, files, | |
2074 | or autoreplies, and there were no errors or deferments, the message is to be | |
2075 | discarded, usually because of the use of :blackhole: in an alias file. */ | |
2076 | ||
2f682e45 | 2077 | if (allok && !addr_local && !addr_remote) |
dbcef0ea | 2078 | { |
059ec3d9 | 2079 | fprintf(f, "mail to %s is discarded\n", address); |
d9b2312b | 2080 | goto out; |
dbcef0ea | 2081 | } |
059ec3d9 | 2082 | |
dbcef0ea | 2083 | for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++) |
08f3b11b | 2084 | while (addr_list) |
059ec3d9 PH |
2085 | { |
2086 | address_item *addr = addr_list; | |
2087 | address_item *p = addr->parent; | |
08f3b11b JH |
2088 | transport_instance * tp = addr->transport; |
2089 | ||
059ec3d9 PH |
2090 | addr_list = addr->next; |
2091 | ||
2092 | fprintf(f, "%s", CS addr->address); | |
384152a6 | 2093 | #ifdef EXPERIMENTAL_SRS |
d43cbe25 JH |
2094 | if(addr->prop.srs_sender) |
2095 | fprintf(f, " [srs = %s]", addr->prop.srs_sender); | |
384152a6 | 2096 | #endif |
dbcef0ea PH |
2097 | |
2098 | /* If the address is a duplicate, show something about it. */ | |
2099 | ||
2100 | if (!testflag(addr, af_pfr)) | |
2101 | { | |
2102 | tree_node *tnode; | |
08f3b11b | 2103 | if ((tnode = tree_search(tree_duplicates, addr->unique))) |
dbcef0ea PH |
2104 | fprintf(f, " [duplicate, would not be delivered]"); |
2105 | else tree_add_duplicate(addr->unique, addr); | |
2106 | } | |
2107 | ||
2108 | /* Now show its parents */ | |
2109 | ||
08f3b11b | 2110 | for (p = addr->parent; p; p = p->parent) |
059ec3d9 | 2111 | fprintf(f, "\n <-- %s", p->address); |
059ec3d9 PH |
2112 | fprintf(f, "\n "); |
2113 | ||
2114 | /* Show router, and transport */ | |
2115 | ||
08f3b11b JH |
2116 | fprintf(f, "router = %s, transport = %s\n", |
2117 | addr->router->name, tp ? tp->name : US"unset"); | |
059ec3d9 PH |
2118 | |
2119 | /* Show any hosts that are set up by a router unless the transport | |
2120 | is going to override them; fiddle a bit to get a nice format. */ | |
2121 | ||
08f3b11b | 2122 | if (addr->host_list && tp && !tp->overrides_hosts) |
059ec3d9 PH |
2123 | { |
2124 | host_item *h; | |
2125 | int maxlen = 0; | |
2126 | int maxaddlen = 0; | |
08f3b11b JH |
2127 | for (h = addr->host_list; h; h = h->next) |
2128 | { /* get max lengths of host names, addrs */ | |
059ec3d9 PH |
2129 | int len = Ustrlen(h->name); |
2130 | if (len > maxlen) maxlen = len; | |
08f3b11b | 2131 | len = h->address ? Ustrlen(h->address) : 7; |
059ec3d9 PH |
2132 | if (len > maxaddlen) maxaddlen = len; |
2133 | } | |
08f3b11b JH |
2134 | for (h = addr->host_list; h; h = h->next) |
2135 | { | |
2136 | fprintf(f, " host %-*s ", maxlen, h->name); | |
2137 | ||
2138 | if (h->address) | |
2139 | fprintf(f, "[%s%-*c", h->address, maxaddlen+1 - Ustrlen(h->address), ']'); | |
2140 | else if (tp->info->local) | |
2141 | fprintf(f, " %-*s ", maxaddlen, ""); /* Omit [unknown] for local */ | |
2142 | else | |
2143 | fprintf(f, "[%s%-*c", "unknown", maxaddlen+1 - 7, ']'); | |
2144 | ||
2145 | if (h->mx >= 0) fprintf(f, " MX=%d", h->mx); | |
059ec3d9 | 2146 | if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port); |
08f3b11b JH |
2147 | if (running_in_test_harness && h->dnssec == DS_YES) fputs(" AD", f); |
2148 | if (h->status == hstatus_unusable) fputs(" ** unusable **", f); | |
2149 | fputc('\n', f); | |
059ec3d9 PH |
2150 | } |
2151 | } | |
2152 | } | |
059ec3d9 | 2153 | |
d9b2312b | 2154 | /* Yield will be DEFER or FAIL if any one address has, only for full_info (which is |
2c7db3f5 PH |
2155 | the -bv or -bt case). */ |
2156 | ||
d9b2312b | 2157 | out: |
ea90b718 | 2158 | verify_mode = NULL; |
35aba663 | 2159 | tls_modify_variables(&tls_in); |
d9b2312b | 2160 | |
8e669ac1 | 2161 | return yield; |
059ec3d9 PH |
2162 | } |
2163 | ||
2164 | ||
2165 | ||
2166 | ||
2167 | /************************************************* | |
2168 | * Check headers for syntax errors * | |
2169 | *************************************************/ | |
2170 | ||
2171 | /* This function checks those header lines that contain addresses, and verifies | |
db57e575 | 2172 | that all the addresses therein are 5322-syntactially correct. |
059ec3d9 PH |
2173 | |
2174 | Arguments: | |
2175 | msgptr where to put an error message | |
2176 | ||
2177 | Returns: OK | |
2178 | FAIL | |
2179 | */ | |
2180 | ||
2181 | int | |
2182 | verify_check_headers(uschar **msgptr) | |
2183 | { | |
2184 | header_line *h; | |
2185 | uschar *colon, *s; | |
1eccaa59 | 2186 | int yield = OK; |
059ec3d9 | 2187 | |
db57e575 | 2188 | for (h = header_list; h && yield == OK; h = h->next) |
059ec3d9 PH |
2189 | { |
2190 | if (h->type != htype_from && | |
2191 | h->type != htype_reply_to && | |
2192 | h->type != htype_sender && | |
2193 | h->type != htype_to && | |
2194 | h->type != htype_cc && | |
2195 | h->type != htype_bcc) | |
2196 | continue; | |
2197 | ||
2198 | colon = Ustrchr(h->text, ':'); | |
2199 | s = colon + 1; | |
2200 | while (isspace(*s)) s++; | |
2201 | ||
1eccaa59 PH |
2202 | /* Loop for multiple addresses in the header, enabling group syntax. Note |
2203 | that we have to reset this after the header has been scanned. */ | |
059ec3d9 | 2204 | |
1eccaa59 | 2205 | parse_allow_group = TRUE; |
059ec3d9 | 2206 | |
db57e575 | 2207 | while (*s) |
059ec3d9 PH |
2208 | { |
2209 | uschar *ss = parse_find_address_end(s, FALSE); | |
2210 | uschar *recipient, *errmess; | |
2211 | int terminator = *ss; | |
2212 | int start, end, domain; | |
2213 | ||
2214 | /* Temporarily terminate the string at this point, and extract the | |
1eccaa59 | 2215 | operative address within, allowing group syntax. */ |
059ec3d9 PH |
2216 | |
2217 | *ss = 0; | |
2218 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
2219 | *ss = terminator; | |
2220 | ||
2221 | /* Permit an unqualified address only if the message is local, or if the | |
2222 | sending host is configured to be permitted to send them. */ | |
2223 | ||
db57e575 | 2224 | if (recipient && !domain) |
059ec3d9 PH |
2225 | { |
2226 | if (h->type == htype_from || h->type == htype_sender) | |
2227 | { | |
2228 | if (!allow_unqualified_sender) recipient = NULL; | |
2229 | } | |
2230 | else | |
2231 | { | |
2232 | if (!allow_unqualified_recipient) recipient = NULL; | |
2233 | } | |
2234 | if (recipient == NULL) errmess = US"unqualified address not permitted"; | |
2235 | } | |
2236 | ||
2237 | /* It's an error if no address could be extracted, except for the special | |
2238 | case of an empty address. */ | |
2239 | ||
db57e575 | 2240 | if (!recipient && Ustrcmp(errmess, "empty address") != 0) |
059ec3d9 PH |
2241 | { |
2242 | uschar *verb = US"is"; | |
2243 | uschar *t = ss; | |
1ab95fa6 | 2244 | uschar *tt = colon; |
059ec3d9 PH |
2245 | int len; |
2246 | ||
2247 | /* Arrange not to include any white space at the end in the | |
1ab95fa6 | 2248 | error message or the header name. */ |
059ec3d9 PH |
2249 | |
2250 | while (t > s && isspace(t[-1])) t--; | |
1ab95fa6 | 2251 | while (tt > h->text && isspace(tt[-1])) tt--; |
059ec3d9 | 2252 | |
1ab95fa6 | 2253 | /* Add the address that failed to the error message, since in a |
059ec3d9 PH |
2254 | header with very many addresses it is sometimes hard to spot |
2255 | which one is at fault. However, limit the amount of address to | |
2256 | quote - cases have been seen where, for example, a missing double | |
2257 | quote in a humungous To: header creates an "address" that is longer | |
2258 | than string_sprintf can handle. */ | |
2259 | ||
2260 | len = t - s; | |
2261 | if (len > 1024) | |
2262 | { | |
2263 | len = 1024; | |
2264 | verb = US"begins"; | |
2265 | } | |
2266 | ||
55414b25 JH |
2267 | /* deconst cast ok as we're passing a non-const to string_printing() */ |
2268 | *msgptr = US string_printing( | |
1ab95fa6 | 2269 | string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s", |
bb07bcd3 | 2270 | errmess, (int)(tt - h->text), h->text, verb, len, s)); |
059ec3d9 | 2271 | |
1eccaa59 PH |
2272 | yield = FAIL; |
2273 | break; /* Out of address loop */ | |
059ec3d9 PH |
2274 | } |
2275 | ||
2276 | /* Advance to the next address */ | |
2277 | ||
db57e575 | 2278 | s = ss + (terminator ? 1 : 0); |
059ec3d9 PH |
2279 | while (isspace(*s)) s++; |
2280 | } /* Next address */ | |
059ec3d9 | 2281 | |
1eccaa59 PH |
2282 | parse_allow_group = FALSE; |
2283 | parse_found_group = FALSE; | |
2284 | } /* Next header unless yield has been set FALSE */ | |
2285 | ||
2286 | return yield; | |
059ec3d9 PH |
2287 | } |
2288 | ||
2289 | ||
770747fd MFM |
2290 | /************************************************* |
2291 | * Check header names for 8-bit characters * | |
2292 | *************************************************/ | |
2293 | ||
4c04137d | 2294 | /* This function checks for invalid characters in header names. See |
770747fd MFM |
2295 | RFC 5322, 2.2. and RFC 6532, 3. |
2296 | ||
2297 | Arguments: | |
2298 | msgptr where to put an error message | |
2299 | ||
2300 | Returns: OK | |
2301 | FAIL | |
2302 | */ | |
2303 | ||
2304 | int | |
2305 | verify_check_header_names_ascii(uschar **msgptr) | |
2306 | { | |
2307 | header_line *h; | |
2308 | uschar *colon, *s; | |
2309 | ||
57cc2785 | 2310 | for (h = header_list; h; h = h->next) |
770747fd | 2311 | { |
57cc2785 JH |
2312 | colon = Ustrchr(h->text, ':'); |
2313 | for(s = h->text; s < colon; s++) | |
2314 | if ((*s < 33) || (*s > 126)) | |
2315 | { | |
2316 | *msgptr = string_sprintf("Invalid character in header \"%.*s\" found", | |
2317 | colon - h->text, h->text); | |
2318 | return FAIL; | |
2319 | } | |
770747fd MFM |
2320 | } |
2321 | return OK; | |
2322 | } | |
059ec3d9 | 2323 | |
1c41c9cc PH |
2324 | /************************************************* |
2325 | * Check for blind recipients * | |
2326 | *************************************************/ | |
2327 | ||
2328 | /* This function checks that every (envelope) recipient is mentioned in either | |
2329 | the To: or Cc: header lines, thus detecting blind carbon copies. | |
2330 | ||
2331 | There are two ways of scanning that could be used: either scan the header lines | |
2332 | and tick off the recipients, or scan the recipients and check the header lines. | |
2333 | The original proposed patch did the former, but I have chosen to do the latter, | |
2334 | because (a) it requires no memory and (b) will use fewer resources when there | |
2335 | are many addresses in To: and/or Cc: and only one or two envelope recipients. | |
2336 | ||
2337 | Arguments: none | |
2338 | Returns: OK if there are no blind recipients | |
2339 | FAIL if there is at least one blind recipient | |
2340 | */ | |
2341 | ||
2342 | int | |
2343 | verify_check_notblind(void) | |
2344 | { | |
2345 | int i; | |
2346 | for (i = 0; i < recipients_count; i++) | |
2347 | { | |
2348 | header_line *h; | |
2349 | BOOL found = FALSE; | |
2350 | uschar *address = recipients_list[i].address; | |
2351 | ||
2352 | for (h = header_list; !found && h != NULL; h = h->next) | |
2353 | { | |
2354 | uschar *colon, *s; | |
2355 | ||
2356 | if (h->type != htype_to && h->type != htype_cc) continue; | |
2357 | ||
2358 | colon = Ustrchr(h->text, ':'); | |
2359 | s = colon + 1; | |
2360 | while (isspace(*s)) s++; | |
2361 | ||
1eccaa59 PH |
2362 | /* Loop for multiple addresses in the header, enabling group syntax. Note |
2363 | that we have to reset this after the header has been scanned. */ | |
1c41c9cc | 2364 | |
1eccaa59 | 2365 | parse_allow_group = TRUE; |
1c41c9cc PH |
2366 | |
2367 | while (*s != 0) | |
2368 | { | |
2369 | uschar *ss = parse_find_address_end(s, FALSE); | |
2370 | uschar *recipient,*errmess; | |
2371 | int terminator = *ss; | |
2372 | int start, end, domain; | |
2373 | ||
2374 | /* Temporarily terminate the string at this point, and extract the | |
1eccaa59 | 2375 | operative address within, allowing group syntax. */ |
1c41c9cc PH |
2376 | |
2377 | *ss = 0; | |
2378 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
2379 | *ss = terminator; | |
2380 | ||
2381 | /* If we found a valid recipient that has a domain, compare it with the | |
2382 | envelope recipient. Local parts are compared case-sensitively, domains | |
2383 | case-insensitively. By comparing from the start with length "domain", we | |
2384 | include the "@" at the end, which ensures that we are comparing the whole | |
2385 | local part of each address. */ | |
2386 | ||
2387 | if (recipient != NULL && domain != 0) | |
2388 | { | |
2389 | found = Ustrncmp(recipient, address, domain) == 0 && | |
2390 | strcmpic(recipient + domain, address + domain) == 0; | |
2391 | if (found) break; | |
2392 | } | |
2393 | ||
2394 | /* Advance to the next address */ | |
2395 | ||
2396 | s = ss + (terminator? 1:0); | |
2397 | while (isspace(*s)) s++; | |
2398 | } /* Next address */ | |
1eccaa59 PH |
2399 | |
2400 | parse_allow_group = FALSE; | |
2401 | parse_found_group = FALSE; | |
1c41c9cc PH |
2402 | } /* Next header (if found is false) */ |
2403 | ||
2404 | if (!found) return FAIL; | |
2405 | } /* Next recipient */ | |
2406 | ||
2407 | return OK; | |
2408 | } | |
2409 | ||
2410 | ||
059ec3d9 PH |
2411 | |
2412 | /************************************************* | |
2413 | * Find if verified sender * | |
2414 | *************************************************/ | |
2415 | ||
2416 | /* Usually, just a single address is verified as the sender of the message. | |
2417 | However, Exim can be made to verify other addresses as well (often related in | |
2418 | some way), and this is useful in some environments. There may therefore be a | |
2419 | chain of such addresses that have previously been tested. This function finds | |
2420 | whether a given address is on the chain. | |
2421 | ||
2422 | Arguments: the address to be verified | |
2423 | Returns: pointer to an address item, or NULL | |
2424 | */ | |
2425 | ||
2426 | address_item * | |
2427 | verify_checked_sender(uschar *sender) | |
2428 | { | |
2429 | address_item *addr; | |
2430 | for (addr = sender_verified_list; addr != NULL; addr = addr->next) | |
2431 | if (Ustrcmp(sender, addr->address) == 0) break; | |
2432 | return addr; | |
2433 | } | |
2434 | ||
2435 | ||
2436 | ||
2437 | ||
2438 | ||
2439 | /************************************************* | |
2440 | * Get valid header address * | |
2441 | *************************************************/ | |
2442 | ||
2443 | /* Scan the originator headers of the message, looking for an address that | |
2444 | verifies successfully. RFC 822 says: | |
2445 | ||
2446 | o The "Sender" field mailbox should be sent notices of | |
2447 | any problems in transport or delivery of the original | |
2448 | messages. If there is no "Sender" field, then the | |
2449 | "From" field mailbox should be used. | |
2450 | ||
2451 | o If the "Reply-To" field exists, then the reply should | |
2452 | go to the addresses indicated in that field and not to | |
2453 | the address(es) indicated in the "From" field. | |
2454 | ||
2455 | So we check a Sender field if there is one, else a Reply_to field, else a From | |
2456 | field. As some strange messages may have more than one of these fields, | |
2457 | especially if they are resent- fields, check all of them if there is more than | |
2458 | one. | |
2459 | ||
2460 | Arguments: | |
2461 | user_msgptr points to where to put a user error message | |
2462 | log_msgptr points to where to put a log error message | |
2463 | callout timeout for callout check (passed to verify_address()) | |
2464 | callout_overall overall callout timeout (ditto) | |
8e669ac1 | 2465 | callout_connect connect callout timeout (ditto) |
059ec3d9 PH |
2466 | se_mailfrom mailfrom for verify; NULL => "" |
2467 | pm_mailfrom sender for pm callout check (passed to verify_address()) | |
2468 | options callout options (passed to verify_address()) | |
8e669ac1 | 2469 | verrno where to put the address basic_errno |
059ec3d9 PH |
2470 | |
2471 | If log_msgptr is set to something without setting user_msgptr, the caller | |
2472 | normally uses log_msgptr for both things. | |
2473 | ||
2474 | Returns: result of the verification attempt: OK, FAIL, or DEFER; | |
2475 | FAIL is given if no appropriate headers are found | |
2476 | */ | |
2477 | ||
2478 | int | |
2479 | verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr, | |
8e669ac1 | 2480 | int callout, int callout_overall, int callout_connect, uschar *se_mailfrom, |
fe5b5d0b | 2481 | uschar *pm_mailfrom, int options, int *verrno) |
059ec3d9 PH |
2482 | { |
2483 | static int header_types[] = { htype_sender, htype_reply_to, htype_from }; | |
1eccaa59 | 2484 | BOOL done = FALSE; |
059ec3d9 PH |
2485 | int yield = FAIL; |
2486 | int i; | |
2487 | ||
1eccaa59 | 2488 | for (i = 0; i < 3 && !done; i++) |
059ec3d9 PH |
2489 | { |
2490 | header_line *h; | |
1eccaa59 | 2491 | for (h = header_list; h != NULL && !done; h = h->next) |
059ec3d9 PH |
2492 | { |
2493 | int terminator, new_ok; | |
2494 | uschar *s, *ss, *endname; | |
2495 | ||
2496 | if (h->type != header_types[i]) continue; | |
2497 | s = endname = Ustrchr(h->text, ':') + 1; | |
2498 | ||
1eccaa59 PH |
2499 | /* Scan the addresses in the header, enabling group syntax. Note that we |
2500 | have to reset this after the header has been scanned. */ | |
2501 | ||
2502 | parse_allow_group = TRUE; | |
2503 | ||
059ec3d9 PH |
2504 | while (*s != 0) |
2505 | { | |
2506 | address_item *vaddr; | |
2507 | ||
2508 | while (isspace(*s) || *s == ',') s++; | |
2509 | if (*s == 0) break; /* End of header */ | |
2510 | ||
2511 | ss = parse_find_address_end(s, FALSE); | |
2512 | ||
2513 | /* The terminator is a comma or end of header, but there may be white | |
2514 | space preceding it (including newline for the last address). Move back | |
2515 | past any white space so we can check against any cached envelope sender | |
2516 | address verifications. */ | |
2517 | ||
2518 | while (isspace(ss[-1])) ss--; | |
2519 | terminator = *ss; | |
2520 | *ss = 0; | |
2521 | ||
2522 | HDEBUG(D_verify) debug_printf("verifying %.*s header address %s\n", | |
2523 | (int)(endname - h->text), h->text, s); | |
2524 | ||
2525 | /* See if we have already verified this address as an envelope sender, | |
2526 | and if so, use the previous answer. */ | |
2527 | ||
2528 | vaddr = verify_checked_sender(s); | |
2529 | ||
2530 | if (vaddr != NULL && /* Previously checked */ | |
2531 | (callout <= 0 || /* No callout needed; OR */ | |
2532 | vaddr->special_action > 256)) /* Callout was done */ | |
2533 | { | |
2534 | new_ok = vaddr->special_action & 255; | |
2535 | HDEBUG(D_verify) debug_printf("previously checked as envelope sender\n"); | |
2536 | *ss = terminator; /* Restore shortened string */ | |
2537 | } | |
2538 | ||
2539 | /* Otherwise we run the verification now. We must restore the shortened | |
2540 | string before running the verification, so the headers are correct, in | |
2541 | case there is any rewriting. */ | |
2542 | ||
2543 | else | |
2544 | { | |
2545 | int start, end, domain; | |
1eccaa59 PH |
2546 | uschar *address = parse_extract_address(s, log_msgptr, &start, &end, |
2547 | &domain, FALSE); | |
059ec3d9 PH |
2548 | |
2549 | *ss = terminator; | |
2550 | ||
1eccaa59 PH |
2551 | /* If we found an empty address, just carry on with the next one, but |
2552 | kill the message. */ | |
2553 | ||
2554 | if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0) | |
2555 | { | |
2556 | *log_msgptr = NULL; | |
2557 | s = ss; | |
2558 | continue; | |
2559 | } | |
2560 | ||
059ec3d9 PH |
2561 | /* If verification failed because of a syntax error, fail this |
2562 | function, and ensure that the failing address gets added to the error | |
2563 | message. */ | |
2564 | ||
2565 | if (address == NULL) | |
2566 | { | |
2567 | new_ok = FAIL; | |
1eccaa59 PH |
2568 | while (ss > s && isspace(ss[-1])) ss--; |
2569 | *log_msgptr = string_sprintf("syntax error in '%.*s' header when " | |
2570 | "scanning for sender: %s in \"%.*s\"", | |
bb07bcd3 | 2571 | (int)(endname - h->text), h->text, *log_msgptr, (int)(ss - s), s); |
1eccaa59 PH |
2572 | yield = FAIL; |
2573 | done = TRUE; | |
2574 | break; | |
059ec3d9 PH |
2575 | } |
2576 | ||
2f6603e1 | 2577 | /* Else go ahead with the sender verification. But it isn't *the* |
059ec3d9 PH |
2578 | sender of the message, so set vopt_fake_sender to stop sender_address |
2579 | being replaced after rewriting or qualification. */ | |
2580 | ||
2581 | else | |
2582 | { | |
2583 | vaddr = deliver_make_addr(address, FALSE); | |
2584 | new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender, | |
8e669ac1 | 2585 | callout, callout_overall, callout_connect, se_mailfrom, |
4deaf07d | 2586 | pm_mailfrom, NULL); |
059ec3d9 PH |
2587 | } |
2588 | } | |
2589 | ||
2590 | /* We now have the result, either newly found, or cached. If we are | |
2591 | giving out error details, set a specific user error. This means that the | |
2592 | last of these will be returned to the user if all three fail. We do not | |
2593 | set a log message - the generic one below will be used. */ | |
2594 | ||
fe5b5d0b | 2595 | if (new_ok != OK) |
059ec3d9 | 2596 | { |
8e669ac1 | 2597 | *verrno = vaddr->basic_errno; |
fe5b5d0b | 2598 | if (smtp_return_error_details) |
fe5b5d0b PH |
2599 | *user_msgptr = string_sprintf("Rejected after DATA: " |
2600 | "could not verify \"%.*s\" header address\n%s: %s", | |
bb07bcd3 | 2601 | (int)(endname - h->text), h->text, vaddr->address, vaddr->message); |
8e669ac1 | 2602 | } |
059ec3d9 PH |
2603 | |
2604 | /* Success or defer */ | |
2605 | ||
1eccaa59 PH |
2606 | if (new_ok == OK) |
2607 | { | |
2608 | yield = OK; | |
2609 | done = TRUE; | |
2610 | break; | |
2611 | } | |
2612 | ||
059ec3d9 PH |
2613 | if (new_ok == DEFER) yield = DEFER; |
2614 | ||
2615 | /* Move on to any more addresses in the header */ | |
2616 | ||
2617 | s = ss; | |
1eccaa59 PH |
2618 | } /* Next address */ |
2619 | ||
2620 | parse_allow_group = FALSE; | |
2621 | parse_found_group = FALSE; | |
2622 | } /* Next header, unless done */ | |
2623 | } /* Next header type unless done */ | |
059ec3d9 PH |
2624 | |
2625 | if (yield == FAIL && *log_msgptr == NULL) | |
2626 | *log_msgptr = US"there is no valid sender in any header line"; | |
2627 | ||
2628 | if (yield == DEFER && *log_msgptr == NULL) | |
2629 | *log_msgptr = US"all attempts to verify a sender in a header line deferred"; | |
2630 | ||
2631 | return yield; | |
2632 | } | |
2633 | ||
2634 | ||
2635 | ||
2636 | ||
2637 | /************************************************* | |
2638 | * Get RFC 1413 identification * | |
2639 | *************************************************/ | |
2640 | ||
2641 | /* Attempt to get an id from the sending machine via the RFC 1413 protocol. If | |
2642 | the timeout is set to zero, then the query is not done. There may also be lists | |
2643 | of hosts and nets which are exempt. To guard against malefactors sending | |
2644 | non-printing characters which could, for example, disrupt a message's headers, | |
2645 | make sure the string consists of printing characters only. | |
2646 | ||
2647 | Argument: | |
2648 | port the port to connect to; usually this is IDENT_PORT (113), but when | |
2649 | running in the test harness with -bh a different value is used. | |
2650 | ||
2651 | Returns: nothing | |
2652 | ||
2653 | Side effect: any received ident value is put in sender_ident (NULL otherwise) | |
2654 | */ | |
2655 | ||
2656 | void | |
2657 | verify_get_ident(int port) | |
2658 | { | |
2659 | int sock, host_af, qlen; | |
2660 | int received_sender_port, received_interface_port, n; | |
2661 | uschar *p; | |
44e6c20c | 2662 | blob early_data; |
059ec3d9 PH |
2663 | uschar buffer[2048]; |
2664 | ||
2665 | /* Default is no ident. Check whether we want to do an ident check for this | |
2666 | host. */ | |
2667 | ||
2668 | sender_ident = NULL; | |
2669 | if (rfc1413_query_timeout <= 0 || verify_check_host(&rfc1413_hosts) != OK) | |
2670 | return; | |
2671 | ||
2672 | DEBUG(D_ident) debug_printf("doing ident callback\n"); | |
2673 | ||
2674 | /* Set up a connection to the ident port of the remote host. Bind the local end | |
2675 | to the incoming interface address. If the sender host address is an IPv6 | |
2676 | address, the incoming interface address will also be IPv6. */ | |
2677 | ||
fb05276a JH |
2678 | host_af = Ustrchr(sender_host_address, ':') == NULL ? AF_INET : AF_INET6; |
2679 | if ((sock = ip_socket(SOCK_STREAM, host_af)) < 0) return; | |
059ec3d9 PH |
2680 | |
2681 | if (ip_bind(sock, host_af, interface_address, 0) < 0) | |
2682 | { | |
2683 | DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n", | |
2684 | strerror(errno)); | |
2685 | goto END_OFF; | |
2686 | } | |
2687 | ||
44e6c20c JH |
2688 | /* Construct and send the query. */ |
2689 | ||
2690 | qlen = snprintf(CS buffer, sizeof(buffer), "%d , %d\r\n", | |
2691 | sender_host_port, interface_port); | |
2692 | early_data.data = buffer; | |
2693 | early_data.len = qlen; | |
2694 | ||
fb05276a | 2695 | if (ip_connect(sock, host_af, sender_host_address, port, |
44e6c20c | 2696 | rfc1413_query_timeout, &early_data) < 0) |
059ec3d9 | 2697 | { |
6c6d6e48 | 2698 | if (errno == ETIMEDOUT && LOGGING(ident_timeout)) |
059ec3d9 PH |
2699 | log_write(0, LOG_MAIN, "ident connection to %s timed out", |
2700 | sender_host_address); | |
059ec3d9 | 2701 | else |
059ec3d9 PH |
2702 | DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n", |
2703 | sender_host_address, strerror(errno)); | |
059ec3d9 PH |
2704 | goto END_OFF; |
2705 | } | |
2706 | ||
059ec3d9 PH |
2707 | /* Read a response line. We put it into the rest of the buffer, using several |
2708 | recv() calls if necessary. */ | |
2709 | ||
2710 | p = buffer + qlen; | |
2711 | ||
2712 | for (;;) | |
2713 | { | |
2714 | uschar *pp; | |
2715 | int count; | |
2716 | int size = sizeof(buffer) - (p - buffer); | |
2717 | ||
2718 | if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */ | |
2719 | count = ip_recv(sock, p, size, rfc1413_query_timeout); | |
2720 | if (count <= 0) goto END_OFF; /* Read error or EOF */ | |
2721 | ||
2722 | /* Scan what we just read, to see if we have reached the terminating \r\n. Be | |
2723 | generous, and accept a plain \n terminator as well. The only illegal | |
2724 | character is 0. */ | |
2725 | ||
2726 | for (pp = p; pp < p + count; pp++) | |
2727 | { | |
2728 | if (*pp == 0) goto END_OFF; /* Zero octet not allowed */ | |
2729 | if (*pp == '\n') | |
2730 | { | |
2731 | if (pp[-1] == '\r') pp--; | |
2732 | *pp = 0; | |
2733 | goto GOT_DATA; /* Break out of both loops */ | |
2734 | } | |
2735 | } | |
2736 | ||
2737 | /* Reached the end of the data without finding \n. Let the loop continue to | |
2738 | read some more, if there is room. */ | |
2739 | ||
2740 | p = pp; | |
2741 | } | |
2742 | ||
2743 | GOT_DATA: | |
2744 | ||
2745 | /* We have received a line of data. Check it carefully. It must start with the | |
2746 | same two port numbers that we sent, followed by data as defined by the RFC. For | |
2747 | example, | |
2748 | ||
2749 | 12345 , 25 : USERID : UNIX :root | |
2750 | ||
2751 | However, the amount of white space may be different to what we sent. In the | |
2752 | "osname" field there may be several sub-fields, comma separated. The data we | |
2753 | actually want to save follows the third colon. Some systems put leading spaces | |
2754 | in it - we discard those. */ | |
2755 | ||
2756 | if (sscanf(CS buffer + qlen, "%d , %d%n", &received_sender_port, | |
2757 | &received_interface_port, &n) != 2 || | |
2758 | received_sender_port != sender_host_port || | |
2759 | received_interface_port != interface_port) | |
2760 | goto END_OFF; | |
2761 | ||
2762 | p = buffer + qlen + n; | |
2763 | while(isspace(*p)) p++; | |
2764 | if (*p++ != ':') goto END_OFF; | |
2765 | while(isspace(*p)) p++; | |
2766 | if (Ustrncmp(p, "USERID", 6) != 0) goto END_OFF; | |
2767 | p += 6; | |
2768 | while(isspace(*p)) p++; | |
2769 | if (*p++ != ':') goto END_OFF; | |
2770 | while (*p != 0 && *p != ':') p++; | |
2771 | if (*p++ == 0) goto END_OFF; | |
2772 | while(isspace(*p)) p++; | |
2773 | if (*p == 0) goto END_OFF; | |
2774 | ||
2775 | /* The rest of the line is the data we want. We turn it into printing | |
2776 | characters when we save it, so that it cannot mess up the format of any logging | |
2777 | or Received: lines into which it gets inserted. We keep a maximum of 127 | |
55414b25 | 2778 | characters. The deconst cast is ok as we fed a nonconst to string_printing() */ |
059ec3d9 | 2779 | |
55414b25 | 2780 | sender_ident = US string_printing(string_copyn(p, 127)); |
059ec3d9 PH |
2781 | DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident); |
2782 | ||
2783 | END_OFF: | |
f1e894f3 | 2784 | (void)close(sock); |
059ec3d9 PH |
2785 | return; |
2786 | } | |
2787 | ||
2788 | ||
2789 | ||
2790 | ||
2791 | /************************************************* | |
2792 | * Match host to a single host-list item * | |
2793 | *************************************************/ | |
2794 | ||
2795 | /* This function compares a host (name or address) against a single item | |
2796 | from a host list. The host name gets looked up if it is needed and is not | |
2797 | already known. The function is called from verify_check_this_host() via | |
2798 | match_check_list(), which is why most of its arguments are in a single block. | |
2799 | ||
2800 | Arguments: | |
2801 | arg the argument block (see below) | |
2802 | ss the host-list item | |
2803 | valueptr where to pass back looked up data, or NULL | |
2804 | error for error message when returning ERROR | |
2805 | ||
2806 | The block contains: | |
32d668a5 PH |
2807 | host_name (a) the host name, or |
2808 | (b) NULL, implying use sender_host_name and | |
2809 | sender_host_aliases, looking them up if required, or | |
2810 | (c) the empty string, meaning that only IP address matches | |
2811 | are permitted | |
059ec3d9 PH |
2812 | host_address the host address |
2813 | host_ipv4 the IPv4 address taken from an IPv6 one | |
2814 | ||
2815 | Returns: OK matched | |
2816 | FAIL did not match | |
2817 | DEFER lookup deferred | |
32d668a5 PH |
2818 | ERROR (a) failed to find the host name or IP address, or |
2819 | (b) unknown lookup type specified, or | |
2820 | (c) host name encountered when only IP addresses are | |
2821 | being matched | |
059ec3d9 PH |
2822 | */ |
2823 | ||
32d668a5 | 2824 | int |
55414b25 | 2825 | check_host(void *arg, const uschar *ss, const uschar **valueptr, uschar **error) |
059ec3d9 PH |
2826 | { |
2827 | check_host_block *cb = (check_host_block *)arg; | |
32d668a5 | 2828 | int mlen = -1; |
059ec3d9 | 2829 | int maskoffset; |
32d668a5 | 2830 | BOOL iplookup = FALSE; |
059ec3d9 | 2831 | BOOL isquery = FALSE; |
32d668a5 | 2832 | BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0; |
55414b25 | 2833 | const uschar *t; |
32d668a5 | 2834 | uschar *semicolon; |
059ec3d9 PH |
2835 | uschar **aliases; |
2836 | ||
2837 | /* Optimize for the special case when the pattern is "*". */ | |
2838 | ||
2839 | if (*ss == '*' && ss[1] == 0) return OK; | |
2840 | ||
2841 | /* If the pattern is empty, it matches only in the case when there is no host - | |
2842 | this can occur in ACL checking for SMTP input using the -bs option. In this | |
2843 | situation, the host address is the empty string. */ | |
2844 | ||
2845 | if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL; | |
2846 | if (*ss == 0) return FAIL; | |
2847 | ||
32d668a5 PH |
2848 | /* If the pattern is precisely "@" then match against the primary host name, |
2849 | provided that host name matching is permitted; if it's "@[]" match against the | |
2850 | local host's IP addresses. */ | |
059ec3d9 PH |
2851 | |
2852 | if (*ss == '@') | |
2853 | { | |
32d668a5 PH |
2854 | if (ss[1] == 0) |
2855 | { | |
2856 | if (isiponly) return ERROR; | |
2857 | ss = primary_hostname; | |
2858 | } | |
059ec3d9 PH |
2859 | else if (Ustrcmp(ss, "@[]") == 0) |
2860 | { | |
2861 | ip_address_item *ip; | |
2862 | for (ip = host_find_interfaces(); ip != NULL; ip = ip->next) | |
2863 | if (Ustrcmp(ip->address, cb->host_address) == 0) return OK; | |
2864 | return FAIL; | |
2865 | } | |
2866 | } | |
2867 | ||
2868 | /* If the pattern is an IP address, optionally followed by a bitmask count, do | |
4c04137d | 2869 | a (possibly masked) comparison with the current IP address. */ |
059ec3d9 | 2870 | |
7e66e54d | 2871 | if (string_is_ip_address(ss, &maskoffset) != 0) |
059ec3d9 PH |
2872 | return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL); |
2873 | ||
1688f43b PH |
2874 | /* The pattern is not an IP address. A common error that people make is to omit |
2875 | one component of an IPv4 address, either by accident, or believing that, for | |
2876 | 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, | |
2877 | which it isn't. (Those applications that do accept 1.2.3 as an IP address | |
2878 | interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an | |
2879 | ancient specification.) To aid in debugging these cases, we give a specific | |
2880 | error if the pattern contains only digits and dots or contains a slash preceded | |
2881 | only by digits and dots (a slash at the start indicates a file name and of | |
2882 | course slashes may be present in lookups, but not preceded only by digits and | |
2883 | dots). */ | |
2884 | ||
2885 | for (t = ss; isdigit(*t) || *t == '.'; t++); | |
2886 | if (*t == 0 || (*t == '/' && t != ss)) | |
2887 | { | |
2888 | *error = US"malformed IPv4 address or address mask"; | |
2889 | return ERROR; | |
2890 | } | |
2891 | ||
32d668a5 | 2892 | /* See if there is a semicolon in the pattern */ |
059ec3d9 | 2893 | |
32d668a5 PH |
2894 | semicolon = Ustrchr(ss, ';'); |
2895 | ||
2896 | /* If we are doing an IP address only match, then all lookups must be IP | |
df199fec | 2897 | address lookups, even if there is no "net-". */ |
32d668a5 PH |
2898 | |
2899 | if (isiponly) | |
059ec3d9 | 2900 | { |
32d668a5 PH |
2901 | iplookup = semicolon != NULL; |
2902 | } | |
059ec3d9 | 2903 | |
32d668a5 | 2904 | /* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is |
df199fec PH |
2905 | a lookup on a masked IP network, in textual form. We obey this code even if we |
2906 | have already set iplookup, so as to skip over the "net-" prefix and to set the | |
2907 | mask length. The net- stuff really only applies to single-key lookups where the | |
2908 | key is implicit. For query-style lookups the key is specified in the query. | |
2909 | From release 4.30, the use of net- for query style is no longer needed, but we | |
2910 | retain it for backward compatibility. */ | |
2911 | ||
2912 | if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL) | |
32d668a5 PH |
2913 | { |
2914 | mlen = 0; | |
2915 | for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0'; | |
2916 | if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */ | |
2917 | iplookup = (*t++ == '-'); | |
2918 | } | |
1688f43b | 2919 | else t = ss; |
059ec3d9 | 2920 | |
32d668a5 | 2921 | /* Do the IP address lookup if that is indeed what we have */ |
059ec3d9 | 2922 | |
32d668a5 PH |
2923 | if (iplookup) |
2924 | { | |
2925 | int insize; | |
2926 | int search_type; | |
2927 | int incoming[4]; | |
2928 | void *handle; | |
2929 | uschar *filename, *key, *result; | |
2930 | uschar buffer[64]; | |
059ec3d9 | 2931 | |
32d668a5 | 2932 | /* Find the search type */ |
059ec3d9 | 2933 | |
32d668a5 | 2934 | search_type = search_findtype(t, semicolon - t); |
059ec3d9 | 2935 | |
32d668a5 PH |
2936 | if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", |
2937 | search_error_message); | |
059ec3d9 | 2938 | |
13b685f9 PH |
2939 | /* Adjust parameters for the type of lookup. For a query-style lookup, there |
2940 | is no file name, and the "key" is just the query. For query-style with a file | |
2941 | name, we have to fish the file off the start of the query. For a single-key | |
2942 | lookup, the key is the current IP address, masked appropriately, and | |
2943 | reconverted to text form, with the mask appended. For IPv6 addresses, specify | |
6a3bceb1 PH |
2944 | dot separators instead of colons, except when the lookup type is "iplsearch". |
2945 | */ | |
059ec3d9 | 2946 | |
13b685f9 PH |
2947 | if (mac_islookup(search_type, lookup_absfilequery)) |
2948 | { | |
2949 | filename = semicolon + 1; | |
2950 | key = filename; | |
2951 | while (*key != 0 && !isspace(*key)) key++; | |
2952 | filename = string_copyn(filename, key - filename); | |
2953 | while (isspace(*key)) key++; | |
2954 | } | |
2955 | else if (mac_islookup(search_type, lookup_querystyle)) | |
32d668a5 PH |
2956 | { |
2957 | filename = NULL; | |
2958 | key = semicolon + 1; | |
2959 | } | |
6a3bceb1 | 2960 | else /* Single-key style */ |
32d668a5 | 2961 | { |
e6d225ae | 2962 | int sep = (Ustrcmp(lookup_list[search_type]->name, "iplsearch") == 0)? |
6a3bceb1 | 2963 | ':' : '.'; |
32d668a5 PH |
2964 | insize = host_aton(cb->host_address, incoming); |
2965 | host_mask(insize, incoming, mlen); | |
6a3bceb1 | 2966 | (void)host_nmtoa(insize, incoming, mlen, buffer, sep); |
32d668a5 PH |
2967 | key = buffer; |
2968 | filename = semicolon + 1; | |
059ec3d9 | 2969 | } |
32d668a5 PH |
2970 | |
2971 | /* Now do the actual lookup; note that there is no search_close() because | |
2972 | of the caching arrangements. */ | |
2973 | ||
d4ff61d1 JH |
2974 | if (!(handle = search_open(filename, search_type, 0, NULL, NULL))) |
2975 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", search_error_message); | |
2976 | ||
32d668a5 PH |
2977 | result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL); |
2978 | if (valueptr != NULL) *valueptr = result; | |
2979 | return (result != NULL)? OK : search_find_defer? DEFER: FAIL; | |
059ec3d9 PH |
2980 | } |
2981 | ||
2982 | /* The pattern is not an IP address or network reference of any kind. That is, | |
32d668a5 PH |
2983 | it is a host name pattern. If this is an IP only match, there's an error in the |
2984 | host list. */ | |
2985 | ||
2986 | if (isiponly) | |
2987 | { | |
2988 | *error = US"cannot match host name in match_ip list"; | |
2989 | return ERROR; | |
2990 | } | |
2991 | ||
2992 | /* Check the characters of the pattern to see if they comprise only letters, | |
2993 | digits, full stops, and hyphens (the constituents of domain names). Allow | |
2994 | underscores, as they are all too commonly found. Sigh. Also, if | |
2995 | allow_utf8_domains is set, allow top-bit characters. */ | |
059ec3d9 PH |
2996 | |
2997 | for (t = ss; *t != 0; t++) | |
2998 | if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' && | |
2999 | (!allow_utf8_domains || *t < 128)) break; | |
3000 | ||
3001 | /* If the pattern is a complete domain name, with no fancy characters, look up | |
3002 | its IP address and match against that. Note that a multi-homed host will add | |
3003 | items to the chain. */ | |
3004 | ||
3005 | if (*t == 0) | |
3006 | { | |
3007 | int rc; | |
3008 | host_item h; | |
3009 | h.next = NULL; | |
3010 | h.name = ss; | |
3011 | h.address = NULL; | |
3012 | h.mx = MX_NONE; | |
9b8fadde | 3013 | |
1f155f8e JH |
3014 | /* Using byname rather than bydns here means we cannot determine dnssec |
3015 | status. On the other hand it is unclear how that could be either | |
3016 | propagated up or enforced. */ | |
3017 | ||
322050c2 | 3018 | rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE); |
059ec3d9 PH |
3019 | if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL) |
3020 | { | |
3021 | host_item *hh; | |
3022 | for (hh = &h; hh != NULL; hh = hh->next) | |
3023 | { | |
96776534 | 3024 | if (host_is_in_net(hh->address, cb->host_address, 0)) return OK; |
059ec3d9 PH |
3025 | } |
3026 | return FAIL; | |
3027 | } | |
3028 | if (rc == HOST_FIND_AGAIN) return DEFER; | |
3029 | *error = string_sprintf("failed to find IP address for %s", ss); | |
3030 | return ERROR; | |
3031 | } | |
3032 | ||
3033 | /* Almost all subsequent comparisons require the host name, and can be done | |
3034 | using the general string matching function. When this function is called for | |
3035 | outgoing hosts, the name is always given explicitly. If it is NULL, it means we | |
3036 | must use sender_host_name and its aliases, looking them up if necessary. */ | |
3037 | ||
3038 | if (cb->host_name != NULL) /* Explicit host name given */ | |
3039 | return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE, | |
3040 | valueptr); | |
3041 | ||
3042 | /* Host name not given; in principle we need the sender host name and its | |
3043 | aliases. However, for query-style lookups, we do not need the name if the | |
3044 | query does not contain $sender_host_name. From release 4.23, a reference to | |
3045 | $sender_host_name causes it to be looked up, so we don't need to do the lookup | |
3046 | on spec. */ | |
3047 | ||
3048 | if ((semicolon = Ustrchr(ss, ';')) != NULL) | |
3049 | { | |
55414b25 | 3050 | const uschar *affix; |
059ec3d9 PH |
3051 | int partial, affixlen, starflags, id; |
3052 | ||
3053 | *semicolon = 0; | |
3054 | id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags); | |
3055 | *semicolon=';'; | |
3056 | ||
3057 | if (id < 0) /* Unknown lookup type */ | |
3058 | { | |
3059 | log_write(0, LOG_MAIN|LOG_PANIC, "%s in host list item \"%s\"", | |
3060 | search_error_message, ss); | |
3061 | return DEFER; | |
3062 | } | |
13b685f9 | 3063 | isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery); |
059ec3d9 PH |
3064 | } |
3065 | ||
3066 | if (isquery) | |
3067 | { | |
3068 | switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr)) | |
3069 | { | |
3070 | case OK: return OK; | |
3071 | case DEFER: return DEFER; | |
3072 | default: return FAIL; | |
3073 | } | |
3074 | } | |
3075 | ||
3076 | /* Not a query-style lookup; must ensure the host name is present, and then we | |
3077 | do a check on the name and all its aliases. */ | |
3078 | ||
2d0dc929 | 3079 | if (!sender_host_name) |
059ec3d9 PH |
3080 | { |
3081 | HDEBUG(D_host_lookup) | |
3082 | debug_printf("sender host name required, to match against %s\n", ss); | |
3083 | if (host_lookup_failed || host_name_lookup() != OK) | |
3084 | { | |
3085 | *error = string_sprintf("failed to find host name for %s", | |
3086 | sender_host_address);; | |
3087 | return ERROR; | |
3088 | } | |
3089 | host_build_sender_fullhost(); | |
3090 | } | |
3091 | ||
3092 | /* Match on the sender host name, using the general matching function */ | |
3093 | ||
2d0dc929 | 3094 | switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE, valueptr)) |
059ec3d9 PH |
3095 | { |
3096 | case OK: return OK; | |
3097 | case DEFER: return DEFER; | |
3098 | } | |
3099 | ||
3100 | /* If there are aliases, try matching on them. */ | |
3101 | ||
3102 | aliases = sender_host_aliases; | |
2d0dc929 | 3103 | while (*aliases) |
059ec3d9 PH |
3104 | switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr)) |
3105 | { | |
3106 | case OK: return OK; | |
3107 | case DEFER: return DEFER; | |
3108 | } | |
059ec3d9 PH |
3109 | return FAIL; |
3110 | } | |
3111 | ||
3112 | ||
3113 | ||
3114 | ||
3115 | /************************************************* | |
3116 | * Check a specific host matches a host list * | |
3117 | *************************************************/ | |
3118 | ||
3119 | /* This function is passed a host list containing items in a number of | |
3120 | different formats and the identity of a host. Its job is to determine whether | |
3121 | the given host is in the set of hosts defined by the list. The host name is | |
3122 | passed as a pointer so that it can be looked up if needed and not already | |
3123 | known. This is commonly the case when called from verify_check_host() to check | |
3124 | an incoming connection. When called from elsewhere the host name should usually | |
3125 | be set. | |
3126 | ||
3127 | This function is now just a front end to match_check_list(), which runs common | |
3128 | code for scanning a list. We pass it the check_host() function to perform a | |
3129 | single test. | |
3130 | ||
3131 | Arguments: | |
3132 | listptr pointer to the host list | |
3133 | cache_bits pointer to cache for named lists, or NULL | |
3134 | host_name the host name or NULL, implying use sender_host_name and | |
3135 | sender_host_aliases, looking them up if required | |
3136 | host_address the IP address | |
3137 | valueptr if not NULL, data from a lookup is passed back here | |
3138 | ||
3139 | Returns: OK if the host is in the defined set | |
3140 | FAIL if the host is not in the defined set, | |
3141 | DEFER if a data lookup deferred (not a host lookup) | |
3142 | ||
3143 | If the host name was needed in order to make a comparison, and could not be | |
3144 | determined from the IP address, the result is FAIL unless the item | |
3145 | "+allow_unknown" was met earlier in the list, in which case OK is returned. */ | |
3146 | ||
3147 | int | |
55414b25 JH |
3148 | verify_check_this_host(const uschar **listptr, unsigned int *cache_bits, |
3149 | const uschar *host_name, const uschar *host_address, const uschar **valueptr) | |
059ec3d9 | 3150 | { |
d4eb88df | 3151 | int rc; |
059ec3d9 | 3152 | unsigned int *local_cache_bits = cache_bits; |
55414b25 | 3153 | const uschar *save_host_address = deliver_host_address; |
0ab63f3d | 3154 | check_host_block cb = { .host_name = host_name, .host_address = host_address }; |
059ec3d9 | 3155 | |
0ab63f3d | 3156 | if (valueptr) *valueptr = NULL; |
059ec3d9 PH |
3157 | |
3158 | /* If the host address starts off ::ffff: it is an IPv6 address in | |
3159 | IPv4-compatible mode. Find the IPv4 part for checking against IPv4 | |
3160 | addresses. */ | |
3161 | ||
0ab63f3d JH |
3162 | cb.host_ipv4 = Ustrncmp(host_address, "::ffff:", 7) == 0 |
3163 | ? host_address + 7 : host_address; | |
059ec3d9 | 3164 | |
8e669ac1 PH |
3165 | /* During the running of the check, put the IP address into $host_address. In |
3166 | the case of calls from the smtp transport, it will already be there. However, | |
3167 | in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on | |
d4eb88df PH |
3168 | the safe side, any existing setting is preserved, though as I write this |
3169 | (November 2004) I can't see any cases where it is actually needed. */ | |
3170 | ||
3171 | deliver_host_address = host_address; | |
3172 | rc = match_check_list( | |
3173 | listptr, /* the list */ | |
3174 | 0, /* separator character */ | |
3175 | &hostlist_anchor, /* anchor pointer */ | |
3176 | &local_cache_bits, /* cache pointer */ | |
3177 | check_host, /* function for testing */ | |
3178 | &cb, /* argument for function */ | |
3179 | MCL_HOST, /* type of check */ | |
8e669ac1 | 3180 | (host_address == sender_host_address)? |
d4eb88df PH |
3181 | US"host" : host_address, /* text for debugging */ |
3182 | valueptr); /* where to pass back data */ | |
3183 | deliver_host_address = save_host_address; | |
8e669ac1 | 3184 | return rc; |
059ec3d9 PH |
3185 | } |
3186 | ||
3187 | ||
3188 | ||
3189 | ||
5130845b JH |
3190 | /************************************************* |
3191 | * Check the given host item matches a list * | |
3192 | *************************************************/ | |
3193 | int | |
3194 | verify_check_given_host(uschar **listptr, host_item *host) | |
3195 | { | |
55414b25 | 3196 | return verify_check_this_host(CUSS listptr, NULL, host->name, host->address, NULL); |
5130845b JH |
3197 | } |
3198 | ||
059ec3d9 PH |
3199 | /************************************************* |
3200 | * Check the remote host matches a list * | |
3201 | *************************************************/ | |
3202 | ||
3203 | /* This is a front end to verify_check_this_host(), created because checking | |
3204 | the remote host is a common occurrence. With luck, a good compiler will spot | |
3205 | the tail recursion and optimize it. If there's no host address, this is | |
3206 | command-line SMTP input - check against an empty string for the address. | |
3207 | ||
3208 | Arguments: | |
3209 | listptr pointer to the host list | |
3210 | ||
3211 | Returns: the yield of verify_check_this_host(), | |
3212 | i.e. OK, FAIL, or DEFER | |
3213 | */ | |
3214 | ||
3215 | int | |
3216 | verify_check_host(uschar **listptr) | |
3217 | { | |
55414b25 | 3218 | return verify_check_this_host(CUSS listptr, sender_host_cache, NULL, |
059ec3d9 PH |
3219 | (sender_host_address == NULL)? US"" : sender_host_address, NULL); |
3220 | } | |
3221 | ||
3222 | ||
3223 | ||
3224 | ||
3225 | ||
3226 | /************************************************* | |
83e029d5 | 3227 | * Invert an IP address * |
059ec3d9 PH |
3228 | *************************************************/ |
3229 | ||
83e029d5 PP |
3230 | /* Originally just used for DNS xBL lists, now also used for the |
3231 | reverse_ip expansion operator. | |
3232 | ||
059ec3d9 PH |
3233 | Arguments: |
3234 | buffer where to put the answer | |
3235 | address the address to invert | |
3236 | */ | |
3237 | ||
83e029d5 | 3238 | void |
059ec3d9 PH |
3239 | invert_address(uschar *buffer, uschar *address) |
3240 | { | |
3241 | int bin[4]; | |
3242 | uschar *bptr = buffer; | |
3243 | ||
3244 | /* If this is an IPv4 address mapped into IPv6 format, adjust the pointer | |
3245 | to the IPv4 part only. */ | |
3246 | ||
3247 | if (Ustrncmp(address, "::ffff:", 7) == 0) address += 7; | |
3248 | ||
3249 | /* Handle IPv4 address: when HAVE_IPV6 is false, the result of host_aton() is | |
3250 | always 1. */ | |
3251 | ||
3252 | if (host_aton(address, bin) == 1) | |
3253 | { | |
3254 | int i; | |
3255 | int x = bin[0]; | |
3256 | for (i = 0; i < 4; i++) | |
3257 | { | |
3258 | sprintf(CS bptr, "%d.", x & 255); | |
3259 | while (*bptr) bptr++; | |
3260 | x >>= 8; | |
3261 | } | |
3262 | } | |
3263 | ||
3264 | /* Handle IPv6 address. Actually, as far as I know, there are no IPv6 addresses | |
3265 | in any DNS black lists, and the format in which they will be looked up is | |
3266 | unknown. This is just a guess. */ | |
3267 | ||
3268 | #if HAVE_IPV6 | |
3269 | else | |
3270 | { | |
3271 | int i, j; | |
3272 | for (j = 3; j >= 0; j--) | |
3273 | { | |
3274 | int x = bin[j]; | |
3275 | for (i = 0; i < 8; i++) | |
3276 | { | |
3277 | sprintf(CS bptr, "%x.", x & 15); | |
3278 | while (*bptr) bptr++; | |
3279 | x >>= 4; | |
3280 | } | |
3281 | } | |
3282 | } | |
3283 | #endif | |
d6f6e0dc PH |
3284 | |
3285 | /* Remove trailing period -- this is needed so that both arbitrary | |
3286 | dnsbl keydomains and inverted addresses may be combined with the | |
3287 | same format string, "%s.%s" */ | |
3288 | ||
3289 | *(--bptr) = 0; | |
059ec3d9 PH |
3290 | } |
3291 | ||
3292 | ||
3293 | ||
0bcb2a0e PH |
3294 | /************************************************* |
3295 | * Perform a single dnsbl lookup * | |
3296 | *************************************************/ | |
3297 | ||
d6f6e0dc PH |
3298 | /* This function is called from verify_check_dnsbl() below. It is also called |
3299 | recursively from within itself when domain and domain_txt are different | |
3300 | pointers, in order to get the TXT record from the alternate domain. | |
0bcb2a0e PH |
3301 | |
3302 | Arguments: | |
d6f6e0dc PH |
3303 | domain the outer dnsbl domain |
3304 | domain_txt alternate domain to lookup TXT record on success; when the | |
3305 | same domain is to be used, domain_txt == domain (that is, | |
3306 | the pointers must be identical, not just the text) | |
8e669ac1 | 3307 | keydomain the current keydomain (for debug message) |
d6f6e0dc PH |
3308 | prepend subdomain to lookup (like keydomain, but |
3309 | reversed if IP address) | |
3310 | iplist the list of matching IP addresses, or NULL for "any" | |
8e669ac1 | 3311 | bitmask true if bitmask matching is wanted |
431b7361 PH |
3312 | match_type condition for 'succeed' result |
3313 | 0 => Any RR in iplist (=) | |
3314 | 1 => No RR in iplist (!=) | |
3315 | 2 => All RRs in iplist (==) | |
3316 | 3 => Some RRs not in iplist (!==) | |
3317 | the two bits are defined as MT_NOT and MT_ALL | |
8e669ac1 | 3318 | defer_return what to return for a defer |
0bcb2a0e PH |
3319 | |
3320 | Returns: OK if lookup succeeded | |
3321 | FAIL if not | |
3322 | */ | |
3323 | ||
3324 | static int | |
d6f6e0dc | 3325 | one_check_dnsbl(uschar *domain, uschar *domain_txt, uschar *keydomain, |
431b7361 | 3326 | uschar *prepend, uschar *iplist, BOOL bitmask, int match_type, |
d6f6e0dc | 3327 | int defer_return) |
8e669ac1 | 3328 | { |
0bcb2a0e PH |
3329 | dns_answer dnsa; |
3330 | dns_scan dnss; | |
3331 | tree_node *t; | |
3332 | dnsbl_cache_block *cb; | |
3333 | int old_pool = store_pool; | |
d6f6e0dc PH |
3334 | uschar query[256]; /* DNS domain max length */ |
3335 | ||
3336 | /* Construct the specific query domainname */ | |
3337 | ||
3338 | if (!string_format(query, sizeof(query), "%s.%s", prepend, domain)) | |
3339 | { | |
3340 | log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long " | |
3341 | "(ignored): %s...", query); | |
3342 | return FAIL; | |
3343 | } | |
0bcb2a0e PH |
3344 | |
3345 | /* Look for this query in the cache. */ | |
3346 | ||
14b3c5bc JH |
3347 | if ( (t = tree_search(dnsbl_cache, query)) |
3348 | && (cb = t->data.ptr)->expiry > time(NULL) | |
3349 | ) | |
3350 | ||
3351 | /* Previous lookup was cached */ | |
3352 | ||
3353 | { | |
3354 | HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n"); | |
3355 | } | |
0bcb2a0e PH |
3356 | |
3357 | /* If not cached from a previous lookup, we must do a DNS lookup, and | |
3358 | cache the result in permanent memory. */ | |
3359 | ||
14b3c5bc | 3360 | else |
0bcb2a0e | 3361 | { |
e162fc97 | 3362 | uint ttl = 3600; |
14b3c5bc | 3363 | |
0bcb2a0e PH |
3364 | store_pool = POOL_PERM; |
3365 | ||
14b3c5bc JH |
3366 | if (t) |
3367 | { | |
3368 | HDEBUG(D_dnsbl) debug_printf("cached data found but past valid time; "); | |
3369 | } | |
0bcb2a0e | 3370 | |
14b3c5bc JH |
3371 | else |
3372 | { /* Set up a tree entry to cache the lookup */ | |
3373 | t = store_get(sizeof(tree_node) + Ustrlen(query)); | |
3374 | Ustrcpy(t->name, query); | |
3375 | t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block)); | |
3376 | (void)tree_insertnode(&dnsbl_cache, t); | |
3377 | } | |
0bcb2a0e | 3378 | |
4c04137d | 3379 | /* Do the DNS lookup . */ |
0bcb2a0e PH |
3380 | |
3381 | HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query); | |
3382 | cb->rc = dns_basic_lookup(&dnsa, query, T_A); | |
3383 | cb->text_set = FALSE; | |
3384 | cb->text = NULL; | |
3385 | cb->rhs = NULL; | |
3386 | ||
3387 | /* If the lookup succeeded, cache the RHS address. The code allows for | |
3388 | more than one address - this was for complete generality and the possible | |
3389 | use of A6 records. However, A6 records have been reduced to experimental | |
3390 | status (August 2001) and may die out. So they may never get used at all, | |
3391 | let alone in dnsbl records. However, leave the code here, just in case. | |
3392 | ||
3393 | Quite apart from one A6 RR generating multiple addresses, there are DNS | |
3394 | lists that return more than one A record, so we must handle multiple | |
e162fc97 JH |
3395 | addresses generated in that way as well. |
3396 | ||
3397 | Mark the cache entry with the "now" plus the minimum of the address TTLs, | |
3398 | or some suitably far-future time if none were found. */ | |
0bcb2a0e PH |
3399 | |
3400 | if (cb->rc == DNS_SUCCEED) | |
3401 | { | |
3402 | dns_record *rr; | |
3403 | dns_address **addrp = &(cb->rhs); | |
3404 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
e1a3f32f | 3405 | rr; |
0bcb2a0e | 3406 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) |
0bcb2a0e PH |
3407 | if (rr->type == T_A) |
3408 | { | |
3409 | dns_address *da = dns_address_from_rr(&dnsa, rr); | |
e1a3f32f | 3410 | if (da) |
0bcb2a0e PH |
3411 | { |
3412 | *addrp = da; | |
2d0dc929 JH |
3413 | while (da->next) da = da->next; |
3414 | addrp = &da->next; | |
14b3c5bc | 3415 | if (ttl > rr->ttl) ttl = rr->ttl; |
0bcb2a0e PH |
3416 | } |
3417 | } | |
0bcb2a0e PH |
3418 | |
3419 | /* If we didn't find any A records, change the return code. This can | |
3420 | happen when there is a CNAME record but there are no A records for what | |
3421 | it points to. */ | |
3422 | ||
2d0dc929 | 3423 | if (!cb->rhs) cb->rc = DNS_NODATA; |
0bcb2a0e PH |
3424 | } |
3425 | ||
14b3c5bc | 3426 | cb->expiry = time(NULL)+ttl; |
0bcb2a0e PH |
3427 | store_pool = old_pool; |
3428 | } | |
3429 | ||
0bcb2a0e PH |
3430 | /* We now have the result of the DNS lookup, either newly done, or cached |
3431 | from a previous call. If the lookup succeeded, check against the address | |
3432 | list if there is one. This may be a positive equality list (introduced by | |
3433 | "="), a negative equality list (introduced by "!="), a positive bitmask | |
3434 | list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/ | |
3435 | ||
3436 | if (cb->rc == DNS_SUCCEED) | |
3437 | { | |
3438 | dns_address *da = NULL; | |
3439 | uschar *addlist = cb->rhs->address; | |
3440 | ||
3441 | /* For A and AAAA records, there may be multiple addresses from multiple | |
3442 | records. For A6 records (currently not expected to be used) there may be | |
3443 | multiple addresses from a single record. */ | |
3444 | ||
2d0dc929 | 3445 | for (da = cb->rhs->next; da; da = da->next) |
0bcb2a0e PH |
3446 | addlist = string_sprintf("%s, %s", addlist, da->address); |
3447 | ||
3448 | HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n", | |
3449 | query, addlist); | |
3450 | ||
3451 | /* Address list check; this can be either for equality, or via a bitmask. | |
3452 | In the latter case, all the bits must match. */ | |
3453 | ||
2d0dc929 | 3454 | if (iplist) |
0bcb2a0e | 3455 | { |
2d0dc929 | 3456 | for (da = cb->rhs; da; da = da->next) |
0bcb2a0e | 3457 | { |
431b7361 PH |
3458 | int ipsep = ','; |
3459 | uschar ip[46]; | |
55414b25 | 3460 | const uschar *ptr = iplist; |
431b7361 PH |
3461 | uschar *res; |
3462 | ||
0bcb2a0e | 3463 | /* Handle exact matching */ |
431b7361 | 3464 | |
0bcb2a0e | 3465 | if (!bitmask) |
2d0dc929 JH |
3466 | { |
3467 | while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip)))) | |
3468 | if (Ustrcmp(CS da->address, ip) == 0) | |
3469 | break; | |
3470 | } | |
431b7361 | 3471 | |
0bcb2a0e | 3472 | /* Handle bitmask matching */ |
431b7361 | 3473 | |
0bcb2a0e PH |
3474 | else |
3475 | { | |
3476 | int address[4]; | |
3477 | int mask = 0; | |
3478 | ||
3479 | /* At present, all known DNS blocking lists use A records, with | |
3480 | IPv4 addresses on the RHS encoding the information they return. I | |
3481 | wonder if this will linger on as the last vestige of IPv4 when IPv6 | |
3482 | is ubiquitous? Anyway, for now we use paranoia code to completely | |
3483 | ignore IPv6 addresses. The default mask is 0, which always matches. | |
3484 | We change this only for IPv4 addresses in the list. */ | |
3485 | ||
431b7361 | 3486 | if (host_aton(da->address, address) == 1) mask = address[0]; |
0bcb2a0e PH |
3487 | |
3488 | /* Scan the returned addresses, skipping any that are IPv6 */ | |
3489 | ||
2d0dc929 | 3490 | while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip)))) |
0bcb2a0e | 3491 | { |
431b7361 PH |
3492 | if (host_aton(ip, address) != 1) continue; |
3493 | if ((address[0] & mask) == address[0]) break; | |
0bcb2a0e PH |
3494 | } |
3495 | } | |
3496 | ||
431b7361 PH |
3497 | /* If either |
3498 | ||
3499 | (a) An IP address in an any ('=') list matched, or | |
3500 | (b) No IP address in an all ('==') list matched | |
0bcb2a0e | 3501 | |
431b7361 PH |
3502 | then we're done searching. */ |
3503 | ||
3504 | if (((match_type & MT_ALL) != 0) == (res == NULL)) break; | |
0bcb2a0e PH |
3505 | } |
3506 | ||
431b7361 | 3507 | /* If da == NULL, either |
0bcb2a0e | 3508 | |
431b7361 PH |
3509 | (a) No IP address in an any ('=') list matched, or |
3510 | (b) An IP address in an all ('==') list didn't match | |
0bcb2a0e | 3511 | |
431b7361 PH |
3512 | so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on |
3513 | the list. */ | |
0bcb2a0e | 3514 | |
431b7361 | 3515 | if ((match_type == MT_NOT || match_type == MT_ALL) != (da == NULL)) |
0bcb2a0e PH |
3516 | { |
3517 | HDEBUG(D_dnsbl) | |
3518 | { | |
431b7361 PH |
3519 | uschar *res = NULL; |
3520 | switch(match_type) | |
3521 | { | |
3522 | case 0: | |
2d0dc929 | 3523 | res = US"was no match"; break; |
431b7361 | 3524 | case MT_NOT: |
2d0dc929 | 3525 | res = US"was an exclude match"; break; |
431b7361 | 3526 | case MT_ALL: |
2d0dc929 | 3527 | res = US"was an IP address that did not match"; break; |
431b7361 | 3528 | case MT_NOT|MT_ALL: |
2d0dc929 | 3529 | res = US"were no IP addresses that did not match"; break; |
431b7361 | 3530 | } |
0bcb2a0e | 3531 | debug_printf("=> but we are not accepting this block class because\n"); |
431b7361 PH |
3532 | debug_printf("=> there %s for %s%c%s\n", |
3533 | res, | |
3534 | ((match_type & MT_ALL) == 0)? "" : "=", | |
3535 | bitmask? '&' : '=', iplist); | |
0bcb2a0e | 3536 | } |
8e669ac1 | 3537 | return FAIL; |
0bcb2a0e PH |
3538 | } |
3539 | } | |
3540 | ||
d6f6e0dc PH |
3541 | /* Either there was no IP list, or the record matched, implying that the |
3542 | domain is on the list. We now want to find a corresponding TXT record. If an | |
3543 | alternate domain is specified for the TXT record, call this function | |
3544 | recursively to look that up; this has the side effect of re-checking that | |
3545 | there is indeed an A record at the alternate domain. */ | |
3546 | ||
3547 | if (domain_txt != domain) | |
3548 | return one_check_dnsbl(domain_txt, domain_txt, keydomain, prepend, NULL, | |
431b7361 | 3549 | FALSE, match_type, defer_return); |
d6f6e0dc PH |
3550 | |
3551 | /* If there is no alternate domain, look up a TXT record in the main domain | |
3552 | if it has not previously been cached. */ | |
0bcb2a0e PH |
3553 | |
3554 | if (!cb->text_set) | |
3555 | { | |
3556 | cb->text_set = TRUE; | |
3557 | if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED) | |
3558 | { | |
3559 | dns_record *rr; | |
3560 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
2d0dc929 | 3561 | rr; |
0bcb2a0e PH |
3562 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) |
3563 | if (rr->type == T_TXT) break; | |
2d0dc929 | 3564 | if (rr) |
0bcb2a0e PH |
3565 | { |
3566 | int len = (rr->data)[0]; | |
3567 | if (len > 511) len = 127; | |
3568 | store_pool = POOL_PERM; | |
2d0dc929 | 3569 | cb->text = string_sprintf("%.*s", len, CUS (rr->data+1)); |
0bcb2a0e PH |
3570 | store_pool = old_pool; |
3571 | } | |
3572 | } | |
3573 | } | |
3574 | ||
3575 | dnslist_value = addlist; | |
3576 | dnslist_text = cb->text; | |
3577 | return OK; | |
3578 | } | |
3579 | ||
3580 | /* There was a problem with the DNS lookup */ | |
3581 | ||
3582 | if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA) | |
3583 | { | |
3584 | log_write(L_dnslist_defer, LOG_MAIN, | |
3585 | "DNS list lookup defer (probably timeout) for %s: %s", query, | |
3586 | (defer_return == OK)? US"assumed in list" : | |
3587 | (defer_return == FAIL)? US"assumed not in list" : | |
3588 | US"returned DEFER"); | |
3589 | return defer_return; | |
3590 | } | |
3591 | ||
3592 | /* No entry was found in the DNS; continue for next domain */ | |
3593 | ||
3594 | HDEBUG(D_dnsbl) | |
3595 | { | |
3596 | debug_printf("DNS lookup for %s failed\n", query); | |
3597 | debug_printf("=> that means %s is not listed at %s\n", | |
3598 | keydomain, domain); | |
3599 | } | |
3600 | ||
3601 | return FAIL; | |
3602 | } | |
3603 | ||
3604 | ||
3605 | ||
3606 | ||
059ec3d9 PH |
3607 | /************************************************* |
3608 | * Check host against DNS black lists * | |
3609 | *************************************************/ | |
3610 | ||
3611 | /* This function runs checks against a list of DNS black lists, until one | |
3612 | matches. Each item on the list can be of the form | |
3613 | ||
3614 | domain=ip-address/key | |
3615 | ||
3616 | The domain is the right-most domain that is used for the query, for example, | |
3617 | blackholes.mail-abuse.org. If the IP address is present, there is a match only | |
3618 | if the DNS lookup returns a matching IP address. Several addresses may be | |
3619 | given, comma-separated, for example: x.y.z=127.0.0.1,127.0.0.2. | |
3620 | ||
3621 | If no key is given, what is looked up in the domain is the inverted IP address | |
3622 | of the current client host. If a key is given, it is used to construct the | |
d6f6e0dc | 3623 | domain for the lookup. For example: |
059ec3d9 PH |
3624 | |
3625 | dsn.rfc-ignorant.org/$sender_address_domain | |
3626 | ||
3627 | After finding a match in the DNS, the domain is placed in $dnslist_domain, and | |
3628 | then we check for a TXT record for an error message, and if found, save its | |
3629 | value in $dnslist_text. We also cache everything in a tree, to optimize | |
3630 | multiple lookups. | |
3631 | ||
d6f6e0dc PH |
3632 | The TXT record is normally looked up in the same domain as the A record, but |
3633 | when many lists are combined in a single DNS domain, this will not be a very | |
3634 | specific message. It is possible to specify a different domain for looking up | |
3635 | TXT records; this is given before the main domain, comma-separated. For | |
3636 | example: | |
3637 | ||
3638 | dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \ | |
3639 | socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3 | |
3640 | ||
3641 | The caching ensures that only one lookup in dnsbl.sorbs.net is done. | |
3642 | ||
059ec3d9 PH |
3643 | Note: an address for testing RBL is 192.203.178.39 |
3644 | Note: an address for testing DUL is 192.203.178.4 | |
3645 | Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org | |
3646 | ||
3647 | Arguments: | |
379ba7d0 | 3648 | where the acl type |
059ec3d9 | 3649 | listptr the domain/address/data list |
379ba7d0 | 3650 | log_msgptr log message on error |
059ec3d9 PH |
3651 | |
3652 | Returns: OK successful lookup (i.e. the address is on the list), or | |
3653 | lookup deferred after +include_unknown | |
3654 | FAIL name not found, or no data found for the given type, or | |
3655 | lookup deferred after +exclude_unknown (default) | |
3656 | DEFER lookup failure, if +defer_unknown was set | |
3657 | */ | |
3658 | ||
3659 | int | |
379ba7d0 | 3660 | verify_check_dnsbl(int where, const uschar ** listptr, uschar ** log_msgptr) |
059ec3d9 PH |
3661 | { |
3662 | int sep = 0; | |
3663 | int defer_return = FAIL; | |
55414b25 | 3664 | const uschar *list = *listptr; |
059ec3d9 PH |
3665 | uschar *domain; |
3666 | uschar *s; | |
3667 | uschar buffer[1024]; | |
059ec3d9 PH |
3668 | uschar revadd[128]; /* Long enough for IPv6 address */ |
3669 | ||
3670 | /* Indicate that the inverted IP address is not yet set up */ | |
3671 | ||
3672 | revadd[0] = 0; | |
3673 | ||
0bcb2a0e PH |
3674 | /* In case this is the first time the DNS resolver is being used. */ |
3675 | ||
8c51eead | 3676 | dns_init(FALSE, FALSE, FALSE); /*XXX dnssec? */ |
0bcb2a0e | 3677 | |
059ec3d9 PH |
3678 | /* Loop through all the domains supplied, until something matches */ |
3679 | ||
3680 | while ((domain = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL) | |
3681 | { | |
0bcb2a0e | 3682 | int rc; |
059ec3d9 | 3683 | BOOL bitmask = FALSE; |
431b7361 | 3684 | int match_type = 0; |
d6f6e0dc PH |
3685 | uschar *domain_txt; |
3686 | uschar *comma; | |
059ec3d9 PH |
3687 | uschar *iplist; |
3688 | uschar *key; | |
059ec3d9 PH |
3689 | |
3690 | HDEBUG(D_dnsbl) debug_printf("DNS list check: %s\n", domain); | |
3691 | ||
3692 | /* Deal with special values that change the behaviour on defer */ | |
3693 | ||
3694 | if (domain[0] == '+') | |
3695 | { | |
3696 | if (strcmpic(domain, US"+include_unknown") == 0) defer_return = OK; | |
3697 | else if (strcmpic(domain, US"+exclude_unknown") == 0) defer_return = FAIL; | |
3698 | else if (strcmpic(domain, US"+defer_unknown") == 0) defer_return = DEFER; | |
3699 | else | |
3700 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown item in dnslist (ignored): %s", | |
3701 | domain); | |
3702 | continue; | |
3703 | } | |
3704 | ||
3705 | /* See if there's explicit data to be looked up */ | |
3706 | ||
379ba7d0 | 3707 | if ((key = Ustrchr(domain, '/'))) *key++ = 0; |
059ec3d9 PH |
3708 | |
3709 | /* See if there's a list of addresses supplied after the domain name. This is | |
431b7361 PH |
3710 | introduced by an = or a & character; if preceded by = we require all matches |
3711 | and if preceded by ! we invert the result. */ | |
059ec3d9 | 3712 | |
379ba7d0 | 3713 | if (!(iplist = Ustrchr(domain, '='))) |
059ec3d9 PH |
3714 | { |
3715 | bitmask = TRUE; | |
3716 | iplist = Ustrchr(domain, '&'); | |
3717 | } | |
3718 | ||
379ba7d0 | 3719 | if (iplist) /* Found either = or & */ |
059ec3d9 | 3720 | { |
431b7361 | 3721 | if (iplist > domain && iplist[-1] == '!') /* Handle preceding ! */ |
059ec3d9 | 3722 | { |
431b7361 | 3723 | match_type |= MT_NOT; |
059ec3d9 PH |
3724 | iplist[-1] = 0; |
3725 | } | |
431b7361 PH |
3726 | |
3727 | *iplist++ = 0; /* Terminate domain, move on */ | |
3728 | ||
3729 | /* If we found = (bitmask == FALSE), check for == or =& */ | |
3730 | ||
3731 | if (!bitmask && (*iplist == '=' || *iplist == '&')) | |
3732 | { | |
3733 | bitmask = *iplist++ == '&'; | |
3734 | match_type |= MT_ALL; | |
3735 | } | |
059ec3d9 PH |
3736 | } |
3737 | ||
379ba7d0 | 3738 | |
d6f6e0dc PH |
3739 | /* If there is a comma in the domain, it indicates that a second domain for |
3740 | looking up TXT records is provided, before the main domain. Otherwise we must | |
3741 | set domain_txt == domain. */ | |
3742 | ||
3743 | domain_txt = domain; | |
3744 | comma = Ustrchr(domain, ','); | |
3745 | if (comma != NULL) | |
3746 | { | |
3747 | *comma++ = 0; | |
3748 | domain = comma; | |
3749 | } | |
3750 | ||
059ec3d9 PH |
3751 | /* Check that what we have left is a sensible domain name. There is no reason |
3752 | why these domains should in fact use the same syntax as hosts and email | |
3753 | domains, but in practice they seem to. However, there is little point in | |
3754 | actually causing an error here, because that would no doubt hold up incoming | |
3755 | mail. Instead, I'll just log it. */ | |
3756 | ||
3757 | for (s = domain; *s != 0; s++) | |
3758 | { | |
09dcaba9 | 3759 | if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_') |
059ec3d9 PH |
3760 | { |
3761 | log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains " | |
3762 | "strange characters - is this right?", domain); | |
3763 | break; | |
3764 | } | |
3765 | } | |
3766 | ||
d6f6e0dc PH |
3767 | /* Check the alternate domain if present */ |
3768 | ||
3769 | if (domain_txt != domain) for (s = domain_txt; *s != 0; s++) | |
3770 | { | |
09dcaba9 | 3771 | if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_') |
d6f6e0dc PH |
3772 | { |
3773 | log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains " | |
3774 | "strange characters - is this right?", domain_txt); | |
3775 | break; | |
3776 | } | |
3777 | } | |
3778 | ||
8e669ac1 | 3779 | /* If there is no key string, construct the query by adding the domain name |
0bcb2a0e | 3780 | onto the inverted host address, and perform a single DNS lookup. */ |
8e669ac1 | 3781 | |
059ec3d9 PH |
3782 | if (key == NULL) |
3783 | { | |
379ba7d0 JH |
3784 | if (where == ACL_WHERE_NOTSMTP_START || where == ACL_WHERE_NOTSMTP) |
3785 | { | |
3786 | *log_msgptr = string_sprintf | |
3787 | ("cannot test auto-keyed dnslists condition in %s ACL", | |
3788 | acl_wherenames[where]); | |
3789 | return ERROR; | |
3790 | } | |
059ec3d9 PH |
3791 | if (sender_host_address == NULL) return FAIL; /* can never match */ |
3792 | if (revadd[0] == 0) invert_address(revadd, sender_host_address); | |
d6f6e0dc | 3793 | rc = one_check_dnsbl(domain, domain_txt, sender_host_address, revadd, |
431b7361 | 3794 | iplist, bitmask, match_type, defer_return); |
0bcb2a0e PH |
3795 | if (rc == OK) |
3796 | { | |
d6f6e0dc | 3797 | dnslist_domain = string_copy(domain_txt); |
93655c46 | 3798 | dnslist_matched = string_copy(sender_host_address); |
8e669ac1 | 3799 | HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n", |
d6f6e0dc | 3800 | sender_host_address, dnslist_domain); |
0bcb2a0e | 3801 | } |
0bcb2a0e | 3802 | if (rc != FAIL) return rc; /* OK or DEFER */ |
059ec3d9 | 3803 | } |
8e669ac1 PH |
3804 | |
3805 | /* If there is a key string, it can be a list of domains or IP addresses to | |
0bcb2a0e | 3806 | be concatenated with the main domain. */ |
8e669ac1 | 3807 | |
059ec3d9 PH |
3808 | else |
3809 | { | |
0bcb2a0e | 3810 | int keysep = 0; |
8e669ac1 PH |
3811 | BOOL defer = FALSE; |
3812 | uschar *keydomain; | |
0bcb2a0e | 3813 | uschar keybuffer[256]; |
d6f6e0dc | 3814 | uschar keyrevadd[128]; |
8e669ac1 | 3815 | |
55414b25 | 3816 | while ((keydomain = string_nextinlist(CUSS &key, &keysep, keybuffer, |
0bcb2a0e | 3817 | sizeof(keybuffer))) != NULL) |
8e669ac1 | 3818 | { |
d6f6e0dc PH |
3819 | uschar *prepend = keydomain; |
3820 | ||
7e66e54d | 3821 | if (string_is_ip_address(keydomain, NULL) != 0) |
059ec3d9 | 3822 | { |
0bcb2a0e | 3823 | invert_address(keyrevadd, keydomain); |
d6f6e0dc | 3824 | prepend = keyrevadd; |
059ec3d9 | 3825 | } |
8e669ac1 | 3826 | |
d6f6e0dc | 3827 | rc = one_check_dnsbl(domain, domain_txt, keydomain, prepend, iplist, |
431b7361 | 3828 | bitmask, match_type, defer_return); |
8e669ac1 | 3829 | |
0bcb2a0e | 3830 | if (rc == OK) |
059ec3d9 | 3831 | { |
d6f6e0dc | 3832 | dnslist_domain = string_copy(domain_txt); |
93655c46 | 3833 | dnslist_matched = string_copy(keydomain); |
8e669ac1 | 3834 | HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n", |
d6f6e0dc | 3835 | keydomain, dnslist_domain); |
8e669ac1 | 3836 | return OK; |
059ec3d9 | 3837 | } |
8e669ac1 | 3838 | |
c38d6da9 PH |
3839 | /* If the lookup deferred, remember this fact. We keep trying the rest |
3840 | of the list to see if we get a useful result, and if we don't, we return | |
3841 | DEFER at the end. */ | |
059ec3d9 | 3842 | |
c38d6da9 | 3843 | if (rc == DEFER) defer = TRUE; |
0bcb2a0e | 3844 | } /* continue with next keystring domain/address */ |
c38d6da9 PH |
3845 | |
3846 | if (defer) return DEFER; | |
8e669ac1 | 3847 | } |
0bcb2a0e | 3848 | } /* continue with next dnsdb outer domain */ |
059ec3d9 PH |
3849 | |
3850 | return FAIL; | |
3851 | } | |
3852 | ||
511a6c14 JH |
3853 | /* vi: aw ai sw=2 |
3854 | */ | |
059ec3d9 | 3855 | /* End of verify.c */ |