PIPE_CONNECT: fix feature-cache refresh
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
16
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 #ifdef EXPERIMENTAL_ARC
28 { "arc_sign", opt_stringptr,
29 (void *)offsetof(smtp_transport_options_block, arc_sign) },
30 #endif
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 # ifdef SUPPORT_DANE
42 { "dane_require_tls_ciphers", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dane_require_tls_ciphers) },
44 # endif
45 { "data_timeout", opt_time,
46 (void *)offsetof(smtp_transport_options_block, data_timeout) },
47 { "delay_after_cutoff", opt_bool,
48 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
49 #ifndef DISABLE_DKIM
50 { "dkim_canon", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
52 { "dkim_domain", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
54 { "dkim_hash", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
56 { "dkim_identity", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
58 { "dkim_private_key", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
60 { "dkim_selector", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
62 { "dkim_sign_headers", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
64 { "dkim_strict", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
66 { "dkim_timestamps", opt_stringptr,
67 (void *)offsetof(smtp_transport_options_block, dkim.dkim_timestamps) },
68 #endif
69 { "dns_qualify_single", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
71 { "dns_search_parents", opt_bool,
72 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
73 { "dnssec_request_domains", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
75 { "dnssec_require_domains", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
77 { "dscp", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, dscp) },
79 { "fallback_hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
81 { "final_timeout", opt_time,
82 (void *)offsetof(smtp_transport_options_block, final_timeout) },
83 { "gethostbyname", opt_bool,
84 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
85 { "helo_data", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, helo_data) },
87 { "hosts", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts) },
89 { "hosts_avoid_esmtp", opt_stringptr,
90 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
91 { "hosts_avoid_pipelining", opt_stringptr,
92 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
93 #ifdef SUPPORT_TLS
94 { "hosts_avoid_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
96 #endif
97 { "hosts_max_try", opt_int,
98 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
99 { "hosts_max_try_hardlimit", opt_int,
100 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
101 #ifdef SUPPORT_TLS
102 { "hosts_nopass_tls", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
104 { "hosts_noproxy_tls", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
106 #endif
107 { "hosts_override", opt_bool,
108 (void *)offsetof(smtp_transport_options_block, hosts_override) },
109 #ifdef EXPERIMENTAL_PIPE_CONNECT
110 { "hosts_pipe_connect", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_pipe_connect) },
112 #endif
113 { "hosts_randomize", opt_bool,
114 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
115 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
116 { "hosts_request_ocsp", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
118 #endif
119 { "hosts_require_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
121 #ifdef SUPPORT_TLS
122 # ifdef SUPPORT_DANE
123 { "hosts_require_dane", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
125 # endif
126 # ifndef DISABLE_OCSP
127 { "hosts_require_ocsp", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
129 # endif
130 { "hosts_require_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
132 #endif
133 { "hosts_try_auth", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
135 { "hosts_try_chunking", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
137 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
138 { "hosts_try_dane", opt_stringptr,
139 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
140 #endif
141 { "hosts_try_fastopen", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
143 #ifndef DISABLE_PRDR
144 { "hosts_try_prdr", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
146 #endif
147 #ifdef SUPPORT_TLS
148 { "hosts_verify_avoid_tls", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
150 #endif
151 { "interface", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, interface) },
153 { "keepalive", opt_bool,
154 (void *)offsetof(smtp_transport_options_block, keepalive) },
155 { "lmtp_ignore_quota", opt_bool,
156 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
157 { "max_rcpt", opt_int | opt_public,
158 (void *)offsetof(transport_instance, max_addresses) },
159 { "multi_domain", opt_expand_bool | opt_public,
160 (void *)offsetof(transport_instance, multi_domain) },
161 { "port", opt_stringptr,
162 (void *)offsetof(smtp_transport_options_block, port) },
163 { "protocol", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, protocol) },
165 { "retry_include_ip_address", opt_expand_bool,
166 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
167 { "serialize_hosts", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
169 { "size_addition", opt_int,
170 (void *)offsetof(smtp_transport_options_block, size_addition) },
171 #ifdef SUPPORT_SOCKS
172 { "socks_proxy", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, socks_proxy) },
174 #endif
175 #ifdef SUPPORT_TLS
176 { "tls_certificate", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
178 { "tls_crl", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_crl) },
180 { "tls_dh_min_bits", opt_int,
181 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
182 { "tls_privatekey", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
184 { "tls_require_ciphers", opt_stringptr,
185 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
186 { "tls_sni", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block, tls_sni) },
188 { "tls_tempfail_tryclear", opt_bool,
189 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
190 { "tls_try_verify_hosts", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
192 { "tls_verify_cert_hostnames", opt_stringptr,
193 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
194 { "tls_verify_certificates", opt_stringptr,
195 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
196 { "tls_verify_hosts", opt_stringptr,
197 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) },
198 #endif
199 #ifdef SUPPORT_I18N
200 { "utf8_downconvert", opt_stringptr,
201 (void *)offsetof(smtp_transport_options_block, utf8_downconvert) },
202 #endif
203 };
204
205 /* Size of the options list. An extern variable has to be used so that its
206 address can appear in the tables drtables.c. */
207
208 int smtp_transport_options_count = nelem(smtp_transport_options);
209
210
211 #ifdef MACRO_PREDEF
212
213 /* Dummy values */
214 smtp_transport_options_block smtp_transport_option_defaults = {0};
215 void smtp_transport_init(transport_instance *tblock) {}
216 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
217 void smtp_transport_closedown(transport_instance *tblock) {}
218
219 #else /*!MACRO_PREDEF*/
220
221
222 /* Default private options block for the smtp transport. */
223
224 smtp_transport_options_block smtp_transport_option_defaults = {
225 .hosts = NULL,
226 .fallback_hosts = NULL,
227 .hostlist = NULL,
228 .fallback_hostlist = NULL,
229 .helo_data = US"$primary_hostname",
230 .interface = NULL,
231 .port = NULL,
232 .protocol = US"smtp",
233 .dscp = NULL,
234 .serialize_hosts = NULL,
235 .hosts_try_auth = NULL,
236 .hosts_require_auth = NULL,
237 .hosts_try_chunking = US"*",
238 #ifdef SUPPORT_DANE
239 .hosts_try_dane = NULL,
240 .hosts_require_dane = NULL,
241 .dane_require_tls_ciphers = NULL,
242 #endif
243 .hosts_try_fastopen = NULL,
244 #ifndef DISABLE_PRDR
245 .hosts_try_prdr = US"*",
246 #endif
247 #ifndef DISABLE_OCSP
248 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
249 .hosts_require_ocsp = NULL,
250 #endif
251 .hosts_require_tls = NULL,
252 .hosts_avoid_tls = NULL,
253 .hosts_verify_avoid_tls = NULL,
254 .hosts_avoid_pipelining = NULL,
255 #ifdef EXPERIMENTAL_PIPE_CONNECT
256 .hosts_pipe_connect = NULL,
257 #endif
258 .hosts_avoid_esmtp = NULL,
259 #ifdef SUPPORT_TLS
260 .hosts_nopass_tls = NULL,
261 .hosts_noproxy_tls = US"*",
262 #endif
263 .command_timeout = 5*60,
264 .connect_timeout = 5*60,
265 .data_timeout = 5*60,
266 .final_timeout = 10*60,
267 .size_addition = 1024,
268 .hosts_max_try = 5,
269 .hosts_max_try_hardlimit = 50,
270 .address_retry_include_sender = TRUE,
271 .allow_localhost = FALSE,
272 .authenticated_sender_force = FALSE,
273 .gethostbyname = FALSE,
274 .dns_qualify_single = TRUE,
275 .dns_search_parents = FALSE,
276 .dnssec = { .request=NULL, .require=NULL },
277 .delay_after_cutoff = TRUE,
278 .hosts_override = FALSE,
279 .hosts_randomize = FALSE,
280 .keepalive = TRUE,
281 .lmtp_ignore_quota = FALSE,
282 .expand_retry_include_ip_address = NULL,
283 .retry_include_ip_address = TRUE,
284 #ifdef SUPPORT_SOCKS
285 .socks_proxy = NULL,
286 #endif
287 #ifdef SUPPORT_TLS
288 .tls_certificate = NULL,
289 .tls_crl = NULL,
290 .tls_privatekey = NULL,
291 .tls_require_ciphers = NULL,
292 .tls_sni = NULL,
293 .tls_verify_certificates = US"system",
294 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
295 .tls_tempfail_tryclear = TRUE,
296 .tls_verify_hosts = NULL,
297 .tls_try_verify_hosts = US"*",
298 .tls_verify_cert_hostnames = US"*",
299 #endif
300 #ifdef SUPPORT_I18N
301 .utf8_downconvert = NULL,
302 #endif
303 #ifndef DISABLE_DKIM
304 .dkim =
305 {.dkim_domain = NULL,
306 .dkim_identity = NULL,
307 .dkim_private_key = NULL,
308 .dkim_selector = NULL,
309 .dkim_canon = NULL,
310 .dkim_sign_headers = NULL,
311 .dkim_strict = NULL,
312 .dkim_hash = US"sha256",
313 .dkim_timestamps = NULL,
314 .dot_stuffed = FALSE,
315 .force_bodyhash = FALSE,
316 # ifdef EXPERIMENTAL_ARC
317 .arc_signspec = NULL,
318 # endif
319 },
320 # ifdef EXPERIMENTAL_ARC
321 .arc_sign = NULL,
322 # endif
323 #endif
324 };
325
326 /* some DSN flags for use later */
327
328 static int rf_list[] = {rf_notify_never, rf_notify_success,
329 rf_notify_failure, rf_notify_delay };
330
331 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
332
333
334
335 /* Local statics */
336
337 static uschar *smtp_command; /* Points to last cmd for error messages */
338 static uschar *mail_command; /* Points to MAIL cmd for error messages */
339 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
340 static BOOL update_waiting; /* TRUE to update the "wait" database */
341
342 /*XXX move to smtp_context */
343 static BOOL pipelining_active; /* current transaction is in pipe mode */
344
345
346 static unsigned ehlo_response(uschar * buf, unsigned checks);
347
348
349 /*************************************************
350 * Setup entry point *
351 *************************************************/
352
353 /* This function is called when the transport is about to be used,
354 but before running it in a sub-process. It is used for two things:
355
356 (1) To set the fallback host list in addresses, when delivering.
357 (2) To pass back the interface, port, protocol, and other options, for use
358 during callout verification.
359
360 Arguments:
361 tblock pointer to the transport instance block
362 addrlist list of addresses about to be transported
363 tf if not NULL, pointer to block in which to return options
364 uid the uid that will be set (not used)
365 gid the gid that will be set (not used)
366 errmsg place for error message (not used)
367
368 Returns: OK always (FAIL, DEFER not used)
369 */
370
371 static int
372 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
373 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
374 {
375 smtp_transport_options_block *ob = SOB tblock->options_block;
376
377 errmsg = errmsg; /* Keep picky compilers happy */
378 uid = uid;
379 gid = gid;
380
381 /* Pass back options if required. This interface is getting very messy. */
382
383 if (tf)
384 {
385 tf->interface = ob->interface;
386 tf->port = ob->port;
387 tf->protocol = ob->protocol;
388 tf->hosts = ob->hosts;
389 tf->hosts_override = ob->hosts_override;
390 tf->hosts_randomize = ob->hosts_randomize;
391 tf->gethostbyname = ob->gethostbyname;
392 tf->qualify_single = ob->dns_qualify_single;
393 tf->search_parents = ob->dns_search_parents;
394 tf->helo_data = ob->helo_data;
395 }
396
397 /* Set the fallback host list for all the addresses that don't have fallback
398 host lists, provided that the local host wasn't present in the original host
399 list. */
400
401 if (!testflag(addrlist, af_local_host_removed))
402 for (; addrlist; addrlist = addrlist->next)
403 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
404
405 return OK;
406 }
407
408
409
410 /*************************************************
411 * Initialization entry point *
412 *************************************************/
413
414 /* Called for each instance, after its options have been read, to
415 enable consistency checks to be done, or anything else that needs
416 to be set up.
417
418 Argument: pointer to the transport instance block
419 Returns: nothing
420 */
421
422 void
423 smtp_transport_init(transport_instance *tblock)
424 {
425 smtp_transport_options_block *ob = SOB tblock->options_block;
426
427 /* Retry_use_local_part defaults FALSE if unset */
428
429 if (tblock->retry_use_local_part == TRUE_UNSET)
430 tblock->retry_use_local_part = FALSE;
431
432 /* Set the default port according to the protocol */
433
434 if (!ob->port)
435 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
436 ? US"lmtp"
437 : strcmpic(ob->protocol, US"smtps") == 0
438 ? US"smtps" : US"smtp";
439
440 /* Set up the setup entry point, to be called before subprocesses for this
441 transport. */
442
443 tblock->setup = smtp_transport_setup;
444
445 /* Complain if any of the timeouts are zero. */
446
447 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
448 ob->final_timeout <= 0)
449 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
450 "command, data, or final timeout value is zero for %s transport",
451 tblock->name);
452
453 /* If hosts_override is set and there are local hosts, set the global
454 flag that stops verify from showing router hosts. */
455
456 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
457
458 /* If there are any fallback hosts listed, build a chain of host items
459 for them, but do not do any lookups at this time. */
460
461 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
462 }
463
464
465
466
467
468 /*************************************************
469 * Set delivery info into all active addresses *
470 *************************************************/
471
472 /* Only addresses whose status is >= PENDING are relevant. A lesser
473 status means that an address is not currently being processed.
474
475 Arguments:
476 addrlist points to a chain of addresses
477 errno_value to put in each address's errno field
478 msg to put in each address's message field
479 rc to put in each address's transport_return field
480 pass_message if TRUE, set the "pass message" flag in the address
481 host if set, mark addrs as having used this host
482 smtp_greeting from peer
483 helo_response from peer
484
485 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
486 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
487 this particular type of timeout.
488
489 Returns: nothing
490 */
491
492 static void
493 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
494 BOOL pass_message, host_item * host
495 #ifdef EXPERIMENTAL_DSN_INFO
496 , const uschar * smtp_greeting, const uschar * helo_response
497 #endif
498 )
499 {
500 address_item *addr;
501 int orvalue = 0;
502 if (errno_value == ERRNO_CONNECTTIMEOUT)
503 {
504 errno_value = ETIMEDOUT;
505 orvalue = RTEF_CTOUT;
506 }
507 for (addr = addrlist; addr; addr = addr->next)
508 if (addr->transport_return >= PENDING)
509 {
510 addr->basic_errno = errno_value;
511 addr->more_errno |= orvalue;
512 if (msg)
513 {
514 addr->message = msg;
515 if (pass_message) setflag(addr, af_pass_message);
516 }
517 addr->transport_return = rc;
518 if (host)
519 {
520 addr->host_used = host;
521 #ifdef EXPERIMENTAL_DSN_INFO
522 if (smtp_greeting)
523 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
524 addr->smtp_greeting = smtp_greeting;
525
526 if (helo_response)
527 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
528 addr->helo_response = helo_response;
529 #endif
530 }
531 }
532 }
533
534 static void
535 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
536 BOOL pass_message)
537 {
538 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
539 #ifdef EXPERIMENTAL_DSN_INFO
540 , NULL, NULL
541 #endif
542 );
543 }
544
545
546 /*************************************************
547 * Check an SMTP response *
548 *************************************************/
549
550 /* This function is given an errno code and the SMTP response buffer
551 to analyse, together with the host identification for generating messages. It
552 sets an appropriate message and puts the first digit of the response code into
553 the yield variable. If no response was actually read, a suitable digit is
554 chosen.
555
556 Arguments:
557 host the current host, to get its name for messages
558 errno_value pointer to the errno value
559 more_errno from the top address for use with ERRNO_FILTER_FAIL
560 buffer the SMTP response buffer
561 yield where to put a one-digit SMTP response code
562 message where to put an error message
563 pass_message set TRUE if message is an SMTP response
564
565 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
566 */
567
568 static BOOL
569 check_response(host_item *host, int *errno_value, int more_errno,
570 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
571 {
572 uschar * pl = pipelining_active ? US"pipelined " : US"";
573 const uschar * s;
574
575 *yield = '4'; /* Default setting is to give a temporary error */
576
577 switch(*errno_value)
578 {
579 case ETIMEDOUT: /* Handle response timeout */
580 *message = US string_sprintf("SMTP timeout after %s%s",
581 pl, smtp_command);
582 if (transport_count > 0)
583 *message = US string_sprintf("%s (%d bytes written)", *message,
584 transport_count);
585 return FALSE;
586
587 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
588 s = string_printing(buffer);
589 while (isspace(*s)) s++;
590 *message = *s == 0
591 ? string_sprintf("Malformed SMTP reply (an empty line) "
592 "in response to %s%s", pl, smtp_command)
593 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
594 pl, smtp_command, s);
595 return FALSE;
596
597 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
598 can't send QUIT as we mustn't end the DATA. */
599 *message = string_sprintf("transport filter process failed (%d)%s",
600 more_errno,
601 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
602 return FALSE;
603
604 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
605 can't send QUIT as we mustn't end the DATA. */
606 *message =
607 string_sprintf("failed to expand headers_add or headers_remove: %s",
608 expand_string_message);
609 return FALSE;
610
611 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
612 *message = string_sprintf("failed to write a data block");
613 return FALSE;
614
615 #ifdef SUPPORT_I18N
616 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
617 *message = US"utf8 support required but not offered for forwarding";
618 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
619 return TRUE;
620 #endif
621 }
622
623 /* Handle error responses from the remote mailer. */
624
625 if (buffer[0] != 0)
626 {
627 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
628 "%s", pl, smtp_command, s = string_printing(buffer));
629 *pass_message = TRUE;
630 *yield = buffer[0];
631 return TRUE;
632 }
633
634 /* No data was read. If there is no errno, this must be the EOF (i.e.
635 connection closed) case, which causes deferral. An explicit connection reset
636 error has the same effect. Otherwise, put the host's identity in the message,
637 leaving the errno value to be interpreted as well. In all cases, we have to
638 assume the connection is now dead. */
639
640 if (*errno_value == 0 || *errno_value == ECONNRESET)
641 {
642 *errno_value = ERRNO_SMTPCLOSED;
643 *message = US string_sprintf("Remote host closed connection "
644 "in response to %s%s", pl, smtp_command);
645 }
646 else
647 *message = US string_sprintf("%s [%s]", host->name, host->address);
648
649 return FALSE;
650 }
651
652
653
654 /*************************************************
655 * Write error message to logs *
656 *************************************************/
657
658 /* This writes to the main log and to the message log.
659
660 Arguments:
661 host the current host
662 detail the current message (addr_item->message)
663 basic_errno the errno (addr_item->basic_errno)
664
665 Returns: nothing
666 */
667
668 static void
669 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
670 {
671 gstring * message = LOGGING(outgoing_port)
672 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
673 host->port == PORT_NONE ? 25 : host->port)
674 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
675
676 if (suffix)
677 {
678 message = string_fmt_append(message, ": %s", suffix);
679 if (basic_errno > 0)
680 message = string_fmt_append(message, ": %s", strerror(basic_errno));
681 }
682 else
683 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
684
685 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
686 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
687 }
688
689 static void
690 msglog_line(host_item * host, uschar * message)
691 {
692 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
693 host->name, host->address, message);
694 }
695
696
697
698 #ifndef DISABLE_EVENT
699 /*************************************************
700 * Post-defer action *
701 *************************************************/
702
703 /* This expands an arbitrary per-transport string.
704 It might, for example, be used to write to the database log.
705
706 Arguments:
707 addr the address item containing error information
708 host the current host
709
710 Returns: nothing
711 */
712
713 static void
714 deferred_event_raise(address_item *addr, host_item *host)
715 {
716 uschar * action = addr->transport->event_action;
717 const uschar * save_domain;
718 uschar * save_local;
719
720 if (!action)
721 return;
722
723 save_domain = deliver_domain;
724 save_local = deliver_localpart;
725
726 /*XXX would ip & port already be set up? */
727 deliver_host_address = string_copy(host->address);
728 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
729 event_defer_errno = addr->basic_errno;
730
731 router_name = addr->router->name;
732 transport_name = addr->transport->name;
733 deliver_domain = addr->domain;
734 deliver_localpart = addr->local_part;
735
736 (void) event_raise(action, US"msg:host:defer",
737 addr->message
738 ? addr->basic_errno > 0
739 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
740 : string_copy(addr->message)
741 : addr->basic_errno > 0
742 ? string_copy(US strerror(addr->basic_errno))
743 : NULL);
744
745 deliver_localpart = save_local;
746 deliver_domain = save_domain;
747 router_name = transport_name = NULL;
748 }
749 #endif
750
751 /*************************************************
752 * Reap SMTP specific responses *
753 *************************************************/
754 static int
755 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
756 int count)
757 {
758 uschar flushbuffer[4096];
759
760 while (count-- > 0)
761 {
762 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
763 '2', ob->command_timeout)
764 && (errno != 0 || flushbuffer[0] == 0))
765 break;
766 }
767 return count;
768 }
769
770
771 /* Return boolean success */
772
773 static BOOL
774 smtp_reap_banner(smtp_context * sx)
775 {
776 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
777 '2', (SOB sx->conn_args.ob)->command_timeout);
778 #ifdef EXPERIMENTAL_DSN_INFO
779 sx->smtp_greeting = string_copy(sx->buffer);
780 #endif
781 return good_response;
782 }
783
784 static BOOL
785 smtp_reap_ehlo(smtp_context * sx)
786 {
787 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
788 (SOB sx->conn_args.ob)->command_timeout))
789 {
790 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
791 {
792 #ifdef EXPERIMENTAL_DSN_INFO
793 sx->helo_response = string_copy(sx->buffer);
794 #endif
795 return FALSE;
796 }
797 sx->esmtp = FALSE;
798 }
799 #ifdef EXPERIMENTAL_DSN_INFO
800 sx->helo_response = string_copy(sx->buffer);
801 #endif
802 return TRUE;
803 }
804
805
806
807 #ifdef EXPERIMENTAL_PIPE_CONNECT
808 static uschar *
809 ehlo_cache_key(const smtp_context * sx)
810 {
811 host_item * host = sx->conn_args.host;
812 return Ustrchr(host->address, ':')
813 ? string_sprintf("[%s]:%d.EHLO", host->address,
814 host->port == PORT_NONE ? sx->port : host->port)
815 : string_sprintf("%s:%d.EHLO", host->address,
816 host->port == PORT_NONE ? sx->port : host->port);
817 }
818
819 static void
820 write_ehlo_cache_entry(const smtp_context * sx)
821 {
822 open_db dbblock, * dbm_file;
823
824 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
825 {
826 uschar * ehlo_resp_key = ehlo_cache_key(sx);
827 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
828
829 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
830 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
831 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
832
833 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
834 dbfn_close(dbm_file);
835 }
836 }
837
838 static void
839 invalidate_ehlo_cache_entry(smtp_context * sx)
840 {
841 open_db dbblock, * dbm_file;
842
843 if ( sx->early_pipe_active
844 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
845 {
846 uschar * ehlo_resp_key = ehlo_cache_key(sx);
847 dbfn_delete(dbm_file, ehlo_resp_key);
848 dbfn_close(dbm_file);
849 }
850 }
851
852 static BOOL
853 read_ehlo_cache_entry(smtp_context * sx)
854 {
855 open_db dbblock;
856 open_db * dbm_file;
857
858 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE)))
859 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
860 else
861 {
862 uschar * ehlo_resp_key = ehlo_cache_key(sx);
863 dbdata_ehlo_resp * er;
864
865 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
866 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
867 else if (time(NULL) - er->time_stamp > retry_data_expire)
868 {
869 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
870 dbfn_close(dbm_file);
871 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
872 dbfn_delete(dbm_file, ehlo_resp_key);
873 }
874 else
875 {
876 sx->ehlo_resp = er->data;
877 dbfn_close(dbm_file);
878 DEBUG(D_transport) debug_printf(
879 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
880 er->data.cleartext_features, er->data.crypted_features);
881 return TRUE;
882 }
883 dbfn_close(dbm_file);
884 }
885 return FALSE;
886 }
887
888
889
890 /* Return an auths bitmap for the set of AUTH methods offered by the server
891 which match our authenticators. */
892
893 static unsigned short
894 study_ehlo_auths(smtp_context * sx)
895 {
896 uschar * names;
897 auth_instance * au;
898 uschar authnum;
899 unsigned short authbits = 0;
900
901 if (!sx->esmtp) return 0;
902 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
903 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
904 expand_nmax = -1; /* reset */
905 names = string_copyn(expand_nstring[1], expand_nlength[1]);
906
907 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
908 {
909 const uschar * list = names;
910 int sep = ' ';
911 uschar name[32];
912
913 while (string_nextinlist(&list, &sep, name, sizeof(name)))
914 if (strcmpic(au->public_name, name) == 0)
915 { authbits |= BIT(authnum); break; }
916 }
917
918 DEBUG(D_transport)
919 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
920 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
921
922 if (tls_out.active.sock >= 0)
923 sx->ehlo_resp.crypted_auths = authbits;
924 else
925 sx->ehlo_resp.cleartext_auths = authbits;
926 return authbits;
927 }
928
929
930
931
932 /* Wait for and check responses for early-pipelining.
933
934 Called from the lower-level smtp_read_response() function
935 used for general code that assume synchronisation, if context
936 flags indicate outstanding early-pipelining commands. Also
937 called fom sync_responses() which handles pipelined commands.
938
939 Arguments:
940 sx smtp connection context
941 countp number of outstanding responses, adjusted on return
942
943 Return:
944 OK all well
945 FAIL SMTP error in response
946 */
947 int
948 smtp_reap_early_pipe(smtp_context * sx, int * countp)
949 {
950 BOOL pending_BANNER = sx->pending_BANNER;
951 BOOL pending_EHLO = sx->pending_EHLO;
952
953 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
954 sx->pending_EHLO = FALSE;
955
956 if (pending_BANNER)
957 {
958 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
959 (*countp)--;
960 if (!smtp_reap_banner(sx))
961 {
962 DEBUG(D_transport) debug_printf("bad banner\n");
963 goto fail;
964 }
965 }
966
967 if (pending_EHLO)
968 {
969 unsigned peer_offered;
970 unsigned short authbits = 0, * ap;
971
972 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
973 (*countp)--;
974 if (!smtp_reap_ehlo(sx))
975 {
976 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
977 goto fail;
978 }
979
980 /* Compare the actual EHLO response to the cached value we assumed;
981 on difference, dump or rewrite the cache and arrange for a retry. */
982
983 ap = tls_out.active.sock < 0
984 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
985
986 peer_offered = ehlo_response(sx->buffer,
987 (tls_out.active.sock < 0 ? OPTION_TLS : OPTION_REQUIRETLS)
988 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
989 | OPTION_UTF8 | OPTION_EARLY_PIPE
990 );
991 if ( peer_offered != sx->peer_offered
992 || (authbits = study_ehlo_auths(sx)) != *ap)
993 {
994 HDEBUG(D_transport)
995 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
996 tls_out.active.sock < 0 ? "cleartext" : "crypted",
997 sx->peer_offered, *ap, peer_offered, authbits);
998 *(tls_out.active.sock < 0
999 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1000 *ap = authbits;
1001 if (peer_offered & OPTION_EARLY_PIPE)
1002 write_ehlo_cache_entry(sx);
1003 else
1004 invalidate_ehlo_cache_entry(sx);
1005
1006 return OK; /* just carry on */
1007 }
1008 }
1009 return OK;
1010
1011 fail:
1012 invalidate_ehlo_cache_entry(sx);
1013 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1014 return FAIL;
1015 }
1016 #endif
1017
1018
1019 /*************************************************
1020 * Synchronize SMTP responses *
1021 *************************************************/
1022
1023 /* This function is called from smtp_deliver() to receive SMTP responses from
1024 the server, and match them up with the commands to which they relate. When
1025 PIPELINING is not in use, this function is called after every command, and is
1026 therefore somewhat over-engineered, but it is simpler to use a single scheme
1027 that works both with and without PIPELINING instead of having two separate sets
1028 of code.
1029
1030 The set of commands that are buffered up with pipelining may start with MAIL
1031 and may end with DATA; in between are RCPT commands that correspond to the
1032 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1033 etc.) are never buffered.
1034
1035 Errors after MAIL or DATA abort the whole process leaving the response in the
1036 buffer. After MAIL, pending responses are flushed, and the original command is
1037 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1038 permitted to reject some recipient addresses while accepting others. However
1039 certain errors clearly abort the whole process. Set the value in
1040 transport_return to PENDING_OK if the address is accepted. If there is a
1041 subsequent general error, it will get reset accordingly. If not, it will get
1042 converted to OK at the end.
1043
1044 Arguments:
1045 sx smtp connection context
1046 count the number of responses to read
1047 pending_DATA 0 if last command sent was not DATA
1048 +1 if previously had a good recipient
1049 -1 if not previously had a good recipient
1050
1051 Returns: 3 if at least one address had 2xx and one had 5xx
1052 2 if at least one address had 5xx but none had 2xx
1053 1 if at least one host had a 2xx response, but none had 5xx
1054 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1055 -1 timeout while reading RCPT response
1056 -2 I/O or other non-response error for RCPT
1057 -3 DATA or MAIL failed - errno and buffer set
1058 -4 banner or EHLO failed (early-pipelining)
1059 */
1060
1061 static int
1062 sync_responses(smtp_context * sx, int count, int pending_DATA)
1063 {
1064 address_item * addr = sx->sync_addr;
1065 smtp_transport_options_block * ob = sx->conn_args.ob;
1066 int yield = 0;
1067
1068 #ifdef EXPERIMENTAL_PIPE_CONNECT
1069 if (smtp_reap_early_pipe(sx, &count) != OK)
1070 return -4;
1071 #endif
1072
1073 /* Handle the response for a MAIL command. On error, reinstate the original
1074 command in big_buffer for error message use, and flush any further pending
1075 responses before returning, except after I/O errors and timeouts. */
1076
1077 if (sx->pending_MAIL)
1078 {
1079 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1080 count--;
1081 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1082 '2', ob->command_timeout))
1083 {
1084 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1085 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1086 if (errno == 0 && sx->buffer[0] != 0)
1087 {
1088 int save_errno = 0;
1089 if (sx->buffer[0] == '4')
1090 {
1091 save_errno = ERRNO_MAIL4XX;
1092 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1093 }
1094 count = smtp_discard_responses(sx, ob, count);
1095 errno = save_errno;
1096 }
1097
1098 if (pending_DATA) count--; /* Number of RCPT responses to come */
1099 while (count-- > 0) /* Mark any pending addrs with the host used */
1100 {
1101 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1102 addr->host_used = sx->conn_args.host;
1103 addr = addr->next;
1104 }
1105 return -3;
1106 }
1107 }
1108
1109 if (pending_DATA) count--; /* Number of RCPT responses to come */
1110
1111 /* Read and handle the required number of RCPT responses, matching each one up
1112 with an address by scanning for the next address whose status is PENDING_DEFER.
1113 */
1114
1115 while (count-- > 0)
1116 {
1117 while (addr->transport_return != PENDING_DEFER)
1118 if (!(addr = addr->next))
1119 return -2;
1120
1121 /* The address was accepted */
1122 addr->host_used = sx->conn_args.host;
1123
1124 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1125 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1126 '2', ob->command_timeout))
1127 {
1128 yield |= 1;
1129 addr->transport_return = PENDING_OK;
1130
1131 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1132 ensure that any address-specific retry record is expunged. We do this both
1133 for the basic key and for the version that also includes the sender. */
1134
1135 if (testflag(addr, af_dr_retry_exists))
1136 {
1137 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1138 sender_address);
1139 retry_add_item(addr, altkey, rf_delete);
1140 retry_add_item(addr, addr->address_retry_key, rf_delete);
1141 }
1142 }
1143
1144 /* Timeout while reading the response */
1145
1146 else if (errno == ETIMEDOUT)
1147 {
1148 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1149 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1150 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1151 retry_add_item(addr, addr->address_retry_key, 0);
1152 update_waiting = FALSE;
1153 return -1;
1154 }
1155
1156 /* Handle other errors in obtaining an SMTP response by returning -1. This
1157 will cause all the addresses to be deferred. Restore the SMTP command in
1158 big_buffer for which we are checking the response, so the error message
1159 makes sense. */
1160
1161 else if (errno != 0 || sx->buffer[0] == 0)
1162 {
1163 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
1164 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1165 return -2;
1166 }
1167
1168 /* Handle SMTP permanent and temporary response codes. */
1169
1170 else
1171 {
1172 addr->message =
1173 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1174 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1175 string_printing(sx->buffer));
1176 setflag(addr, af_pass_message);
1177 if (!sx->verify)
1178 msglog_line(sx->conn_args.host, addr->message);
1179
1180 /* The response was 5xx */
1181
1182 if (sx->buffer[0] == '5')
1183 {
1184 addr->transport_return = FAIL;
1185 yield |= 2;
1186 }
1187
1188 /* The response was 4xx */
1189
1190 else
1191 {
1192 addr->transport_return = DEFER;
1193 addr->basic_errno = ERRNO_RCPT4XX;
1194 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1195
1196 if (!sx->verify)
1197 {
1198 #ifndef DISABLE_EVENT
1199 event_defer_errno = addr->more_errno;
1200 msg_event_raise(US"msg:rcpt:host:defer", addr);
1201 #endif
1202
1203 /* Log temporary errors if there are more hosts to be tried.
1204 If not, log this last one in the == line. */
1205
1206 if (sx->conn_args.host->next)
1207 if (LOGGING(outgoing_port))
1208 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1209 sx->conn_args.host->address,
1210 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1211 else
1212 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1213 sx->conn_args.host->address, addr->message);
1214
1215 #ifndef DISABLE_EVENT
1216 else
1217 msg_event_raise(US"msg:rcpt:defer", addr);
1218 #endif
1219
1220 /* Do not put this message on the list of those waiting for specific
1221 hosts, as otherwise it is likely to be tried too often. */
1222
1223 update_waiting = FALSE;
1224
1225 /* Add a retry item for the address so that it doesn't get tried again
1226 too soon. If address_retry_include_sender is true, add the sender address
1227 to the retry key. */
1228
1229 retry_add_item(addr,
1230 ob->address_retry_include_sender
1231 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1232 : addr->address_retry_key,
1233 0);
1234 }
1235 }
1236 }
1237 } /* Loop for next RCPT response */
1238
1239 /* Update where to start at for the next block of responses, unless we
1240 have already handled all the addresses. */
1241
1242 if (addr) sx->sync_addr = addr->next;
1243
1244 /* Handle a response to DATA. If we have not had any good recipients, either
1245 previously or in this block, the response is ignored. */
1246
1247 if (pending_DATA != 0)
1248 {
1249 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1250 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1251 '3', ob->command_timeout))
1252 {
1253 int code;
1254 uschar *msg;
1255 BOOL pass_message;
1256 if (pending_DATA > 0 || (yield & 1) != 0)
1257 {
1258 if (errno == 0 && sx->buffer[0] == '4')
1259 {
1260 errno = ERRNO_DATA4XX;
1261 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1262 }
1263 return -3;
1264 }
1265 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1266 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1267 "is in use and there were no good recipients\n", msg);
1268 }
1269 }
1270
1271 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1272 present) received 3xx. If any RCPTs were handled and yielded anything other
1273 than 4xx, yield will be set non-zero. */
1274
1275 return yield;
1276 }
1277
1278
1279
1280
1281
1282 /* Try an authenticator's client entry */
1283
1284 static int
1285 try_authenticator(smtp_context * sx, auth_instance * au)
1286 {
1287 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1288 host_item * host = sx->conn_args.host; /* host to deliver to */
1289 int rc;
1290
1291 sx->outblock.authenticating = TRUE;
1292 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1293 sx->buffer, sizeof(sx->buffer));
1294 sx->outblock.authenticating = FALSE;
1295 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1296
1297 /* A temporary authentication failure must hold up delivery to
1298 this host. After a permanent authentication failure, we carry on
1299 to try other authentication methods. If all fail hard, try to
1300 deliver the message unauthenticated unless require_auth was set. */
1301
1302 switch(rc)
1303 {
1304 case OK:
1305 f.smtp_authenticated = TRUE; /* stops the outer loop */
1306 client_authenticator = au->name;
1307 if (au->set_client_id)
1308 client_authenticated_id = expand_string(au->set_client_id);
1309 break;
1310
1311 /* Failure after writing a command */
1312
1313 case FAIL_SEND:
1314 return FAIL_SEND;
1315
1316 /* Failure after reading a response */
1317
1318 case FAIL:
1319 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1320 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1321 au->name, host->name, host->address, sx->buffer);
1322 break;
1323
1324 /* Failure by some other means. In effect, the authenticator
1325 decided it wasn't prepared to handle this case. Typically this
1326 is the result of "fail" in an expansion string. Do we need to
1327 log anything here? Feb 2006: a message is now put in the buffer
1328 if logging is required. */
1329
1330 case CANCELLED:
1331 if (*sx->buffer != 0)
1332 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1333 "authentication H=%s [%s] %s", au->name, host->name,
1334 host->address, sx->buffer);
1335 break;
1336
1337 /* Internal problem, message in buffer. */
1338
1339 case ERROR:
1340 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1341 DEFER, FALSE);
1342 return ERROR;
1343 }
1344 return OK;
1345 }
1346
1347
1348
1349
1350 /* Do the client side of smtp-level authentication.
1351
1352 Arguments:
1353 sx smtp connection context
1354
1355 sx->buffer should have the EHLO response from server (gets overwritten)
1356
1357 Returns:
1358 OK Success, or failed (but not required): global "smtp_authenticated" set
1359 DEFER Failed authentication (and was required)
1360 ERROR Internal problem
1361
1362 FAIL_SEND Failed communications - transmit
1363 FAIL - response
1364 */
1365
1366 static int
1367 smtp_auth(smtp_context * sx)
1368 {
1369 host_item * host = sx->conn_args.host; /* host to deliver to */
1370 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1371 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1372 #ifdef EXPERIMENTAL_PIPE_CONNECT
1373 unsigned short authbits = tls_out.active.sock >= 0
1374 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1375 #endif
1376 uschar * fail_reason = US"server did not advertise AUTH support";
1377
1378 f.smtp_authenticated = FALSE;
1379 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1380
1381 if (!regex_AUTH)
1382 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1383
1384 /* Is the server offering AUTH? */
1385
1386 if ( sx->esmtp
1387 &&
1388 #ifdef EXPERIMENTAL_PIPE_CONNECT
1389 sx->early_pipe_active ? authbits
1390 :
1391 #endif
1392 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1393 )
1394 {
1395 uschar * names = NULL;
1396 expand_nmax = -1; /* reset */
1397
1398 #ifdef EXPERIMENTAL_PIPE_CONNECT
1399 if (!sx->early_pipe_active)
1400 #endif
1401 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1402
1403 /* Must not do this check until after we have saved the result of the
1404 regex match above as the check could be another RE. */
1405
1406 if ( require_auth == OK
1407 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1408 {
1409 auth_instance * au;
1410
1411 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1412 fail_reason = US"no common mechanisms were found";
1413
1414 #ifdef EXPERIMENTAL_PIPE_CONNECT
1415 if (sx->early_pipe_active)
1416 {
1417 /* Scan our authenticators (which support use by a client and were offered
1418 by the server (checked at cache-write time)), not suppressed by
1419 client_condition. If one is found, attempt to authenticate by calling its
1420 client function. We are limited to supporting up to 16 authenticator
1421 public-names by the number of bits in a short. */
1422
1423 uschar bitnum;
1424 int rc;
1425
1426 for (bitnum = 0, au = auths;
1427 !f.smtp_authenticated && au && bitnum < 16;
1428 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1429 {
1430 if ( au->client_condition
1431 && !expand_check_condition(au->client_condition, au->name,
1432 US"client authenticator"))
1433 {
1434 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1435 au->name, "client_condition is false");
1436 continue;
1437 }
1438
1439 /* Found data for a listed mechanism. Call its client entry. Set
1440 a flag in the outblock so that data is overwritten after sending so
1441 that reflections don't show it. */
1442
1443 fail_reason = US"authentication attempt(s) failed";
1444
1445 if ((rc = try_authenticator(sx, au)) != OK)
1446 return rc;
1447 }
1448 }
1449 else
1450 #endif
1451
1452 /* Scan the configured authenticators looking for one which is configured
1453 for use as a client, which is not suppressed by client_condition, and
1454 whose name matches an authentication mechanism supported by the server.
1455 If one is found, attempt to authenticate by calling its client function.
1456 */
1457
1458 for (au = auths; !f.smtp_authenticated && au; au = au->next)
1459 {
1460 uschar *p = names;
1461
1462 if ( !au->client
1463 || ( au->client_condition
1464 && !expand_check_condition(au->client_condition, au->name,
1465 US"client authenticator")))
1466 {
1467 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1468 au->name,
1469 (au->client)? "client_condition is false" :
1470 "not configured as a client");
1471 continue;
1472 }
1473
1474 /* Loop to scan supported server mechanisms */
1475
1476 while (*p)
1477 {
1478 int len = Ustrlen(au->public_name);
1479 int rc;
1480
1481 while (isspace(*p)) p++;
1482
1483 if (strncmpic(au->public_name, p, len) != 0 ||
1484 (p[len] != 0 && !isspace(p[len])))
1485 {
1486 while (*p != 0 && !isspace(*p)) p++;
1487 continue;
1488 }
1489
1490 /* Found data for a listed mechanism. Call its client entry. Set
1491 a flag in the outblock so that data is overwritten after sending so
1492 that reflections don't show it. */
1493
1494 fail_reason = US"authentication attempt(s) failed";
1495
1496 if ((rc = try_authenticator(sx, au)) != OK)
1497 return rc;
1498
1499 break; /* If not authenticated, try next authenticator */
1500 } /* Loop for scanning supported server mechanisms */
1501 } /* Loop for further authenticators */
1502 }
1503 }
1504
1505 /* If we haven't authenticated, but are required to, give up. */
1506
1507 if (require_auth == OK && !f.smtp_authenticated)
1508 {
1509 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1510 string_sprintf("authentication required but %s", fail_reason), DEFER,
1511 FALSE);
1512 return DEFER;
1513 }
1514
1515 return OK;
1516 }
1517
1518
1519 /* Construct AUTH appendix string for MAIL TO */
1520 /*
1521 Arguments
1522 buffer to build string
1523 addrlist chain of potential addresses to deliver
1524 ob transport options
1525
1526 Globals f.smtp_authenticated
1527 client_authenticated_sender
1528 Return True on error, otherwise buffer has (possibly empty) terminated string
1529 */
1530
1531 BOOL
1532 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1533 smtp_transport_options_block *ob)
1534 {
1535 uschar *local_authenticated_sender = authenticated_sender;
1536
1537 #ifdef notdef
1538 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1539 #endif
1540
1541 if (ob->authenticated_sender != NULL)
1542 {
1543 uschar *new = expand_string(ob->authenticated_sender);
1544 if (new == NULL)
1545 {
1546 if (!f.expand_string_forcedfail)
1547 {
1548 uschar *message = string_sprintf("failed to expand "
1549 "authenticated_sender: %s", expand_string_message);
1550 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1551 return TRUE;
1552 }
1553 }
1554 else if (new[0] != 0) local_authenticated_sender = new;
1555 }
1556
1557 /* Add the authenticated sender address if present */
1558
1559 if ((f.smtp_authenticated || ob->authenticated_sender_force) &&
1560 local_authenticated_sender != NULL)
1561 {
1562 string_format(buffer, bufsize, " AUTH=%s",
1563 auth_xtextencode(local_authenticated_sender,
1564 Ustrlen(local_authenticated_sender)));
1565 client_authenticated_sender = string_copy(local_authenticated_sender);
1566 }
1567 else
1568 *buffer= 0;
1569
1570 return FALSE;
1571 }
1572
1573
1574
1575 #ifdef SUPPORT_DANE
1576 /* Lookup TLSA record for host/port.
1577 Return: OK success with dnssec; DANE mode
1578 DEFER Do not use this host now, may retry later
1579 FAIL_FORCED No TLSA record; DANE not usable
1580 FAIL Do not use this connection
1581 */
1582
1583 int
1584 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1585 {
1586 /* move this out to host.c given the similarity to dns_lookup() ? */
1587 uschar buffer[300];
1588 const uschar * fullname = buffer;
1589 int rc;
1590 BOOL sec;
1591
1592 /* TLSA lookup string */
1593 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1594
1595 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1596 sec = dns_is_secure(dnsa);
1597 DEBUG(D_transport)
1598 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1599
1600 switch (rc)
1601 {
1602 case DNS_AGAIN:
1603 return DEFER; /* just defer this TLS'd conn */
1604
1605 case DNS_SUCCEED:
1606 if (sec)
1607 {
1608 DEBUG(D_transport)
1609 {
1610 dns_scan dnss;
1611 dns_record * rr;
1612 for (rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1613 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1614 if (rr->type == T_TLSA && rr->size > 3)
1615 {
1616 uint16_t payload_length = rr->size - 3;
1617 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1618
1619 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1620 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1621 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1622 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1623 sp += sprintf(CS sp, "%02x", *p++);
1624
1625 debug_printf(" %s\n", s);
1626 }
1627 }
1628 return OK;
1629 }
1630 log_write(0, LOG_MAIN,
1631 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1632 /*FALLTRHOUGH*/
1633
1634 case DNS_NODATA: /* no TLSA RR for this lookup */
1635 case DNS_NOMATCH: /* no records at all for this lookup */
1636 return dane_required ? FAIL : FAIL_FORCED;
1637
1638 default:
1639 case DNS_FAIL:
1640 return dane_required ? FAIL : DEFER;
1641 }
1642 }
1643 #endif
1644
1645
1646
1647 typedef struct smtp_compare_s
1648 {
1649 uschar *current_sender_address;
1650 struct transport_instance *tblock;
1651 } smtp_compare_t;
1652
1653
1654 /* Create a unique string that identifies this message, it is based on
1655 sender_address, helo_data and tls_certificate if enabled.
1656 */
1657
1658 static uschar *
1659 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1660 {
1661 address_item * addr1;
1662 uschar * if1 = US"";
1663 uschar * helo1 = US"";
1664 #ifdef SUPPORT_TLS
1665 uschar * tlsc1 = US"";
1666 #endif
1667 uschar * save_sender_address = sender_address;
1668 uschar * local_identity = NULL;
1669 smtp_transport_options_block * ob = SOB tblock->options_block;
1670
1671 sender_address = sender;
1672
1673 addr1 = deliver_make_addr (sender, TRUE);
1674 deliver_set_expansions(addr1);
1675
1676 if (ob->interface)
1677 if1 = expand_string(ob->interface);
1678
1679 if (ob->helo_data)
1680 helo1 = expand_string(ob->helo_data);
1681
1682 #ifdef SUPPORT_TLS
1683 if (ob->tls_certificate)
1684 tlsc1 = expand_string(ob->tls_certificate);
1685 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1686 #else
1687 local_identity = string_sprintf ("%s^%s", if1, helo1);
1688 #endif
1689
1690 deliver_set_expansions(NULL);
1691 sender_address = save_sender_address;
1692
1693 return local_identity;
1694 }
1695
1696
1697
1698 /* This routine is a callback that is called from transport_check_waiting.
1699 This function will evaluate the incoming message versus the previous
1700 message. If the incoming message is using a different local identity then
1701 we will veto this new message. */
1702
1703 static BOOL
1704 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1705 {
1706 uschar * message_local_identity,
1707 * current_local_identity,
1708 * new_sender_address;
1709
1710 current_local_identity =
1711 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1712
1713 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1714 return 0;
1715
1716 message_local_identity =
1717 smtp_local_identity(new_sender_address, s_compare->tblock);
1718
1719 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1720 }
1721
1722
1723
1724 static unsigned
1725 ehlo_response(uschar * buf, unsigned checks)
1726 {
1727 size_t bsize = Ustrlen(buf);
1728
1729 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1730
1731 #ifdef SUPPORT_TLS
1732 # ifdef EXPERIMENTAL_REQUIRETLS
1733 if ( checks & OPTION_REQUIRETLS
1734 && pcre_exec(regex_REQUIRETLS, NULL, CS buf,bsize, 0, PCRE_EOPT, NULL,0) < 0)
1735 # endif
1736 checks &= ~OPTION_REQUIRETLS;
1737
1738 if ( checks & OPTION_TLS
1739 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1740 #endif
1741 checks &= ~OPTION_TLS;
1742
1743 if ( checks & OPTION_IGNQ
1744 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1745 PCRE_EOPT, NULL, 0) < 0)
1746 checks &= ~OPTION_IGNQ;
1747
1748 if ( checks & OPTION_CHUNKING
1749 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1750 checks &= ~OPTION_CHUNKING;
1751
1752 #ifndef DISABLE_PRDR
1753 if ( checks & OPTION_PRDR
1754 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1755 #endif
1756 checks &= ~OPTION_PRDR;
1757
1758 #ifdef SUPPORT_I18N
1759 if ( checks & OPTION_UTF8
1760 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1761 #endif
1762 checks &= ~OPTION_UTF8;
1763
1764 if ( checks & OPTION_DSN
1765 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1766 checks &= ~OPTION_DSN;
1767
1768 if ( checks & OPTION_PIPE
1769 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1770 PCRE_EOPT, NULL, 0) < 0)
1771 checks &= ~OPTION_PIPE;
1772
1773 if ( checks & OPTION_SIZE
1774 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1775 checks &= ~OPTION_SIZE;
1776
1777 #ifdef EXPERIMENTAL_PIPE_CONNECT
1778 if ( checks & OPTION_EARLY_PIPE
1779 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1780 PCRE_EOPT, NULL, 0) < 0)
1781 #endif
1782 checks &= ~OPTION_EARLY_PIPE;
1783
1784 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1785 return checks;
1786 }
1787
1788
1789
1790 /* Callback for emitting a BDAT data chunk header.
1791
1792 If given a nonzero size, first flush any buffered SMTP commands
1793 then emit the command.
1794
1795 Reap previous SMTP command responses if requested, and always reap
1796 the response from a previous BDAT command.
1797
1798 Args:
1799 tctx transport context
1800 chunk_size value for SMTP BDAT command
1801 flags
1802 tc_chunk_last add LAST option to SMTP BDAT command
1803 tc_reap_prev reap response to previous SMTP commands
1804
1805 Returns: OK or ERROR
1806 */
1807
1808 static int
1809 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1810 unsigned flags)
1811 {
1812 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1813 smtp_context * sx = tctx->smtp_context;
1814 int cmd_count = 0;
1815 int prev_cmd_count;
1816
1817 /* Write SMTP chunk header command. If not reaping responses, note that
1818 there may be more writes (like, the chunk data) done soon. */
1819
1820 if (chunk_size > 0)
1821 {
1822 #ifdef EXPERIMENTAL_PIPE_CONNECT
1823 BOOL new_conn = !!(sx->outblock.conn_args);
1824 #endif
1825 if((cmd_count = smtp_write_command(sx,
1826 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1827 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1828 ) < 0) return ERROR;
1829 if (flags & tc_chunk_last)
1830 data_command = string_copy(big_buffer); /* Save for later error message */
1831 #ifdef EXPERIMENTAL_PIPE_CONNECT
1832 /* That command write could have been the one that made the connection.
1833 Copy the fd from the client conn ctx (smtp transport specific) to the
1834 generic transport ctx. */
1835
1836 if (new_conn)
1837 tctx->u.fd = sx->outblock.cctx->sock;
1838 #endif
1839 }
1840
1841 prev_cmd_count = cmd_count += sx->cmd_count;
1842
1843 /* Reap responses for any previous, but not one we just emitted */
1844
1845 if (chunk_size > 0)
1846 prev_cmd_count--;
1847 if (sx->pending_BDAT)
1848 prev_cmd_count--;
1849
1850 if (flags & tc_reap_prev && prev_cmd_count > 0)
1851 {
1852 DEBUG(D_transport) debug_printf("look for %d responses"
1853 " for previous pipelined cmds\n", prev_cmd_count);
1854
1855 switch(sync_responses(sx, prev_cmd_count, 0))
1856 {
1857 case 1: /* 2xx (only) => OK */
1858 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1859 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1860 case 0: break; /* No 2xx or 5xx, but no probs */
1861
1862 case -1: /* Timeout on RCPT */
1863 #ifdef EXPERIMENTAL_PIPE_CONNECT
1864 case -4: /* non-2xx for pipelined banner or EHLO */
1865 #endif
1866 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1867 }
1868 cmd_count = 1;
1869 if (!sx->pending_BDAT)
1870 pipelining_active = FALSE;
1871 }
1872
1873 /* Reap response for an outstanding BDAT */
1874
1875 if (sx->pending_BDAT)
1876 {
1877 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1878
1879 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1880 ob->command_timeout))
1881 {
1882 if (errno == 0 && sx->buffer[0] == '4')
1883 {
1884 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1885 sx->addrlist->more_errno |=
1886 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1887 }
1888 return ERROR;
1889 }
1890 cmd_count--;
1891 sx->pending_BDAT = FALSE;
1892 pipelining_active = FALSE;
1893 }
1894 else if (chunk_size > 0)
1895 sx->pending_BDAT = TRUE;
1896
1897
1898 sx->cmd_count = cmd_count;
1899 return OK;
1900 }
1901
1902
1903
1904
1905
1906 /*************************************************
1907 * Make connection for given message *
1908 *************************************************/
1909
1910 /*
1911 Arguments:
1912 ctx connection context
1913 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1914 a second attempt after TLS initialization fails
1915
1916 Returns: OK - the connection was made and the delivery attempted;
1917 fd is set in the conn context, tls_out set up.
1918 DEFER - the connection could not be made, or something failed
1919 while setting up the SMTP session, or there was a
1920 non-message-specific error, such as a timeout.
1921 ERROR - helo_data or add_headers or authenticated_sender is
1922 specified for this transport, and the string failed
1923 to expand
1924 */
1925 int
1926 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1927 {
1928 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1929 dns_answer tlsa_dnsa;
1930 #endif
1931 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1932 BOOL pass_message = FALSE;
1933 uschar * message = NULL;
1934 int yield = OK;
1935 int rc;
1936
1937 sx->conn_args.ob = ob;
1938
1939 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1940 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1941 sx->ok = FALSE;
1942 sx->send_rset = TRUE;
1943 sx->send_quit = TRUE;
1944 sx->setting_up = TRUE;
1945 sx->esmtp = TRUE;
1946 sx->esmtp_sent = FALSE;
1947 #ifdef SUPPORT_I18N
1948 sx->utf8_needed = FALSE;
1949 #endif
1950 sx->dsn_all_lasthop = TRUE;
1951 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1952 sx->dane = FALSE;
1953 sx->dane_required =
1954 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1955 #endif
1956 #ifdef EXPERIMENTAL_PIPE_CONNECT
1957 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1958 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1959 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1960 #endif
1961
1962 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1963 sx->peer_offered = 0;
1964 sx->avoid_option = 0;
1965 sx->igquotstr = US"";
1966 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1967 #ifdef EXPERIMENTAL_DSN_INFO
1968 sx->smtp_greeting = NULL;
1969 sx->helo_response = NULL;
1970 #endif
1971
1972 smtp_command = US"initial connection";
1973 sx->buffer[0] = '\0';
1974
1975 /* Set up the buffer for reading SMTP response packets. */
1976
1977 sx->inblock.buffer = sx->inbuffer;
1978 sx->inblock.buffersize = sizeof(sx->inbuffer);
1979 sx->inblock.ptr = sx->inbuffer;
1980 sx->inblock.ptrend = sx->inbuffer;
1981
1982 /* Set up the buffer for holding SMTP commands while pipelining */
1983
1984 sx->outblock.buffer = sx->outbuffer;
1985 sx->outblock.buffersize = sizeof(sx->outbuffer);
1986 sx->outblock.ptr = sx->outbuffer;
1987 sx->outblock.cmd_count = 0;
1988 sx->outblock.authenticating = FALSE;
1989 sx->outblock.conn_args = NULL;
1990
1991 /* Reset the parameters of a TLS session. */
1992
1993 tls_out.bits = 0;
1994 tls_out.cipher = NULL; /* the one we may use for this transport */
1995 tls_out.ourcert = NULL;
1996 tls_out.peercert = NULL;
1997 tls_out.peerdn = NULL;
1998 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1999 tls_out.sni = NULL;
2000 #endif
2001 tls_out.ocsp = OCSP_NOT_REQ;
2002
2003 /* Flip the legacy TLS-related variables over to the outbound set in case
2004 they're used in the context of the transport. Don't bother resetting
2005 afterward (when being used by a transport) as we're in a subprocess.
2006 For verify, unflipped once the callout is dealt with */
2007
2008 tls_modify_variables(&tls_out);
2009
2010 #ifndef SUPPORT_TLS
2011 if (sx->smtps)
2012 {
2013 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2014 DEFER, FALSE);
2015 return ERROR;
2016 }
2017 #endif
2018
2019 /* Make a connection to the host if this isn't a continued delivery, and handle
2020 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2021 specially so they can be identified for retries. */
2022
2023 if (!continue_hostname)
2024 {
2025 if (sx->verify)
2026 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2027
2028 /* Get the actual port the connection will use, into sx->conn_args.host */
2029
2030 smtp_port_for_connect(sx->conn_args.host, sx->port);
2031
2032 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
2033 /* Do TLSA lookup for DANE */
2034 {
2035 tls_out.dane_verified = FALSE;
2036 tls_out.tlsa_usage = 0;
2037
2038 if (sx->conn_args.host->dnssec == DS_YES)
2039 {
2040 if( sx->dane_required
2041 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2042 )
2043 switch (rc = tlsa_lookup(sx->conn_args.host, &tlsa_dnsa, sx->dane_required))
2044 {
2045 case OK: sx->dane = TRUE;
2046 ob->tls_tempfail_tryclear = FALSE;
2047 break;
2048 case FAIL_FORCED: break;
2049 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2050 string_sprintf("DANE error: tlsa lookup %s",
2051 rc == DEFER ? "DEFER" : "FAIL"),
2052 rc, FALSE);
2053 # ifndef DISABLE_EVENT
2054 (void) event_raise(sx->conn_args.tblock->event_action,
2055 US"dane:fail", sx->dane_required
2056 ? US"dane-required" : US"dnssec-invalid");
2057 # endif
2058 return rc;
2059 }
2060 }
2061 else if (sx->dane_required)
2062 {
2063 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2064 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2065 FAIL, FALSE);
2066 # ifndef DISABLE_EVENT
2067 (void) event_raise(sx->conn_args.tblock->event_action,
2068 US"dane:fail", US"dane-required");
2069 # endif
2070 return FAIL;
2071 }
2072 }
2073 #endif /*DANE*/
2074
2075 /* Make the TCP connection */
2076
2077 sx->cctx.tls_ctx = NULL;
2078 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2079 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2080
2081 #ifdef EXPERIMENTAL_PIPE_CONNECT
2082 if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK)
2083 {
2084 sx->early_pipe_ok = TRUE;
2085 if ( read_ehlo_cache_entry(sx)
2086 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2087 {
2088 DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2089 sx->early_pipe_active = TRUE;
2090 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2091 }
2092 }
2093
2094 if (sx->early_pipe_active)
2095 sx->outblock.conn_args = &sx->conn_args;
2096 else
2097 #endif
2098 {
2099 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2100 {
2101 uschar * msg = NULL;
2102 if (sx->verify)
2103 {
2104 msg = US strerror(errno);
2105 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
2106 }
2107 set_errno_nohost(sx->addrlist,
2108 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2109 sx->verify ? string_sprintf("could not connect: %s", msg)
2110 : NULL,
2111 DEFER, FALSE);
2112 sx->send_quit = FALSE;
2113 return DEFER;
2114 }
2115 }
2116 /* Expand the greeting message while waiting for the initial response. (Makes
2117 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2118 delayed till here so that $sending_interface and $sending_port are set. */
2119 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2120 will be? Somehow I doubt it. */
2121
2122 if (sx->helo_data)
2123 if (!(sx->helo_data = expand_string(sx->helo_data)))
2124 if (sx->verify)
2125 log_write(0, LOG_MAIN|LOG_PANIC,
2126 "<%s>: failed to expand transport's helo_data value for callout: %s",
2127 sx->addrlist->address, expand_string_message);
2128
2129 #ifdef SUPPORT_I18N
2130 if (sx->helo_data)
2131 {
2132 expand_string_message = NULL;
2133 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2134 &expand_string_message)),
2135 expand_string_message)
2136 if (sx->verify)
2137 log_write(0, LOG_MAIN|LOG_PANIC,
2138 "<%s>: failed to expand transport's helo_data value for callout: %s",
2139 sx->addrlist->address, expand_string_message);
2140 else
2141 sx->helo_data = NULL;
2142 }
2143 #endif
2144
2145 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2146 is nevertheless a reasonably clean way of programming this kind of logic,
2147 where you want to escape on any error. */
2148
2149 if (!sx->smtps)
2150 {
2151 #ifdef EXPERIMENTAL_PIPE_CONNECT
2152 if (sx->early_pipe_active)
2153 {
2154 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2155 sx->outblock.cmd_count = 1;
2156 }
2157 else
2158 #endif
2159 {
2160 #ifdef TCP_QUICKACK
2161 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2162 sizeof(off));
2163 #endif
2164 if (!smtp_reap_banner(sx))
2165 goto RESPONSE_FAILED;
2166 }
2167
2168 #ifndef DISABLE_EVENT
2169 {
2170 uschar * s;
2171 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2172 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2173 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2174 if (s)
2175 {
2176 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2177 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2178 DEFER, FALSE);
2179 yield = DEFER;
2180 goto SEND_QUIT;
2181 }
2182 }
2183 #endif
2184
2185 /* Now check if the helo_data expansion went well, and sign off cleanly if
2186 it didn't. */
2187
2188 if (!sx->helo_data)
2189 {
2190 message = string_sprintf("failed to expand helo_data: %s",
2191 expand_string_message);
2192 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2193 yield = DEFER;
2194 goto SEND_QUIT;
2195 }
2196 }
2197
2198 /** Debugging without sending a message
2199 sx->addrlist->transport_return = DEFER;
2200 goto SEND_QUIT;
2201 **/
2202
2203 /* Errors that occur after this point follow an SMTP command, which is
2204 left in big_buffer by smtp_write_command() for use in error messages. */
2205
2206 smtp_command = big_buffer;
2207
2208 /* Tell the remote who we are...
2209
2210 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2211 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2212 greeting is of this form. The assumption was that the far end supports it
2213 properly... but experience shows that there are some that give 5xx responses,
2214 even though the banner includes "ESMTP" (there's a bloody-minded one that
2215 says "ESMTP not spoken here"). Cope with that case.
2216
2217 September 2000: Time has passed, and it seems reasonable now to always send
2218 EHLO at the start. It is also convenient to make the change while installing
2219 the TLS stuff.
2220
2221 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2222 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2223 would be no way to send out the mails, so there is now a host list
2224 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2225 PIPELINING problem as well. Maybe it can also be useful to cure other
2226 problems with broken servers.
2227
2228 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2229 Then somebody tried it with a Microsoft mailer... It seems that all other
2230 mailers use upper case for some reason (the RFC is quite clear about case
2231 independence) so, for peace of mind, I gave in. */
2232
2233 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2234
2235 /* Alas; be careful, since this goto is not an error-out, so conceivably
2236 we might set data between here and the target which we assume to exist
2237 and be usable. I can see this coming back to bite us. */
2238 #ifdef SUPPORT_TLS
2239 if (sx->smtps)
2240 {
2241 smtp_peer_options |= OPTION_TLS;
2242 suppress_tls = FALSE;
2243 ob->tls_tempfail_tryclear = FALSE;
2244 smtp_command = US"SSL-on-connect";
2245 goto TLS_NEGOTIATE;
2246 }
2247 #endif
2248
2249 if (sx->esmtp)
2250 {
2251 if (smtp_write_command(sx,
2252 #ifdef EXPERIMENTAL_PIPE_CONNECT
2253 sx->early_pipe_active ? SCMD_BUFFER :
2254 #endif
2255 SCMD_FLUSH,
2256 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2257 goto SEND_FAILED;
2258 sx->esmtp_sent = TRUE;
2259
2260 #ifdef EXPERIMENTAL_PIPE_CONNECT
2261 if (sx->early_pipe_active)
2262 {
2263 sx->pending_EHLO = TRUE;
2264
2265 /* If we have too many authenticators to handle and might need to AUTH
2266 for this transport, pipeline no further as we will need the
2267 list of auth methods offered. Reap the banner and EHLO. */
2268
2269 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2270 && f.smtp_in_early_pipe_no_auth)
2271 {
2272 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2273 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2274 goto SEND_FAILED;
2275 if (sync_responses(sx, 2, 0) != 0)
2276 {
2277 HDEBUG(D_transport)
2278 debug_printf("failed reaping pipelined cmd responses\n");
2279 goto RESPONSE_FAILED;
2280 }
2281 sx->early_pipe_active = FALSE;
2282 }
2283 }
2284 else
2285 #endif
2286 if (!smtp_reap_ehlo(sx))
2287 goto RESPONSE_FAILED;
2288 }
2289 else
2290 DEBUG(D_transport)
2291 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2292
2293 #ifdef EXPERIMENTAL_PIPE_CONNECT
2294 if (!sx->early_pipe_active)
2295 #endif
2296 if (!sx->esmtp)
2297 {
2298 BOOL good_response;
2299 int n = sizeof(sx->buffer);
2300 uschar * rsp = sx->buffer;
2301
2302 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2303 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2304
2305 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2306 goto SEND_FAILED;
2307 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2308 #ifdef EXPERIMENTAL_DSN_INFO
2309 sx->helo_response = string_copy(rsp);
2310 #endif
2311 if (!good_response)
2312 {
2313 /* Handle special logging for a closed connection after HELO
2314 when had previously sent EHLO */
2315
2316 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2317 {
2318 errno = ERRNO_SMTPCLOSED;
2319 goto EHLOHELO_FAILED;
2320 }
2321 memmove(sx->buffer, rsp, Ustrlen(rsp));
2322 goto RESPONSE_FAILED;
2323 }
2324 }
2325
2326 if (sx->esmtp || sx->lmtp)
2327 {
2328 #ifdef EXPERIMENTAL_PIPE_CONNECT
2329 if (!sx->early_pipe_active)
2330 #endif
2331 {
2332 sx->peer_offered = ehlo_response(sx->buffer,
2333 OPTION_TLS /* others checked later */
2334 #ifdef EXPERIMENTAL_PIPE_CONNECT
2335 | (sx->early_pipe_ok
2336 ? OPTION_IGNQ
2337 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2338 #ifdef SUPPORT_I18N
2339 | OPTION_UTF8
2340 #endif
2341 | OPTION_EARLY_PIPE
2342 : 0
2343 )
2344 #endif
2345 );
2346 #ifdef EXPERIMENTAL_PIPE_CONNECT
2347 if (sx->early_pipe_ok)
2348 {
2349 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2350
2351 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2352 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2353 {
2354 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2355 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2356 write_ehlo_cache_entry(sx);
2357 }
2358 }
2359 #endif
2360 }
2361
2362 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2363
2364 #ifdef SUPPORT_TLS
2365 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2366 #endif
2367 }
2368 }
2369
2370 /* For continuing deliveries down the same channel, having re-exec'd the socket
2371 is the standard input; for a socket held open from verify it is recorded
2372 in the cutthrough context block. Either way we don't need to redo EHLO here
2373 (but may need to do so for TLS - see below).
2374 Set up the pointer to where subsequent commands will be left, for
2375 error messages. Note that smtp_peer_options will have been
2376 set from the command line if they were set in the process that passed the
2377 connection on. */
2378
2379 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2380 as the continue goes via transport_pass_socket() and doublefork and exec.
2381 It does not wait. Unclear how we keep separate host's responses
2382 separate - we could match up by host ip+port as a bodge. */
2383
2384 else
2385 {
2386 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2387 {
2388 sx->cctx = cutthrough.cctx;
2389 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2390 }
2391 else
2392 {
2393 sx->cctx.sock = 0; /* stdin */
2394 sx->cctx.tls_ctx = NULL;
2395 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2396 }
2397 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2398 smtp_command = big_buffer;
2399 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2400
2401 /* For a continued connection with TLS being proxied for us, or a
2402 held-open verify connection with TLS, nothing more to do. */
2403
2404 if ( continue_proxy_cipher
2405 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2406 && cutthrough.is_tls)
2407 )
2408 {
2409 sx->peer_offered = smtp_peer_options;
2410 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2411 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2412 continue_proxy_cipher ? "proxied" : "verify conn with");
2413 return OK;
2414 }
2415 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2416 }
2417
2418 /* If TLS is available on this connection, whether continued or not, attempt to
2419 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2420 send another EHLO - the server may give a different answer in secure mode. We
2421 use a separate buffer for reading the response to STARTTLS so that if it is
2422 negative, the original EHLO data is available for subsequent analysis, should
2423 the client not be required to use TLS. If the response is bad, copy the buffer
2424 for error analysis. */
2425
2426 #ifdef SUPPORT_TLS
2427 if ( smtp_peer_options & OPTION_TLS
2428 && !suppress_tls
2429 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2430 && ( !sx->verify
2431 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2432 ) )
2433 {
2434 uschar buffer2[4096];
2435
2436 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2437 goto SEND_FAILED;
2438
2439 #ifdef EXPERIMENTAL_PIPE_CONNECT
2440 /* If doing early-pipelining reap the banner and EHLO-response but leave
2441 the response for the STARTTLS we just sent alone. */
2442
2443 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2444 {
2445 HDEBUG(D_transport)
2446 debug_printf("failed reaping pipelined cmd responses\n");
2447 goto RESPONSE_FAILED;
2448 }
2449 #endif
2450
2451 /* If there is an I/O error, transmission of this message is deferred. If
2452 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2453 false, we also defer. However, if there is a temporary rejection of STARTTLS
2454 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2455 STARTTLS, we carry on. This means we will try to send the message in clear,
2456 unless the host is in hosts_require_tls (tested below). */
2457
2458 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2459 {
2460 if ( errno != 0
2461 || buffer2[0] == 0
2462 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2463 )
2464 {
2465 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2466 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2467 goto RESPONSE_FAILED;
2468 }
2469 }
2470
2471 /* STARTTLS accepted: try to negotiate a TLS session. */
2472
2473 else
2474 TLS_NEGOTIATE:
2475 {
2476 address_item * addr;
2477 uschar * errstr;
2478 sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->conn_args.host,
2479 sx->addrlist, sx->conn_args.tblock,
2480 # ifdef SUPPORT_DANE
2481 sx->dane ? &tlsa_dnsa : NULL,
2482 # endif
2483 &tls_out, &errstr);
2484
2485 if (!sx->cctx.tls_ctx)
2486 {
2487 /* TLS negotiation failed; give an error. From outside, this function may
2488 be called again to try in clear on a new connection, if the options permit
2489 it for this host. */
2490 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", errstr);
2491
2492 # ifdef SUPPORT_DANE
2493 if (sx->dane)
2494 {
2495 log_write(0, LOG_MAIN,
2496 "DANE attempt failed; TLS connection to %s [%s]: %s",
2497 sx->conn_args.host->name, sx->conn_args.host->address, errstr);
2498 # ifndef DISABLE_EVENT
2499 (void) event_raise(sx->conn_args.tblock->event_action,
2500 US"dane:fail", US"validation-failure"); /* could do with better detail */
2501 # endif
2502 }
2503 # endif
2504
2505 errno = ERRNO_TLSFAILURE;
2506 message = string_sprintf("TLS session: %s", errstr);
2507 sx->send_quit = FALSE;
2508 goto TLS_FAILED;
2509 }
2510
2511 /* TLS session is set up */
2512
2513 smtp_peer_options_wrap = smtp_peer_options;
2514 for (addr = sx->addrlist; addr; addr = addr->next)
2515 if (addr->transport_return == PENDING_DEFER)
2516 {
2517 addr->cipher = tls_out.cipher;
2518 addr->ourcert = tls_out.ourcert;
2519 addr->peercert = tls_out.peercert;
2520 addr->peerdn = tls_out.peerdn;
2521 addr->ocsp = tls_out.ocsp;
2522 }
2523 }
2524 }
2525
2526 /* if smtps, we'll have smtp_command set to something else; always safe to
2527 reset it here. */
2528 smtp_command = big_buffer;
2529
2530 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2531 helo_data is null, we are dealing with a connection that was passed from
2532 another process, and so we won't have expanded helo_data above. We have to
2533 expand it here. $sending_ip_address and $sending_port are set up right at the
2534 start of the Exim process (in exim.c). */
2535
2536 if (tls_out.active.sock >= 0)
2537 {
2538 uschar * greeting_cmd;
2539
2540 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2541 {
2542 uschar *message = string_sprintf("failed to expand helo_data: %s",
2543 expand_string_message);
2544 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2545 yield = DEFER;
2546 goto SEND_QUIT;
2547 }
2548
2549 #ifdef EXPERIMENTAL_PIPE_CONNECT
2550 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2551 We're unlikely to get the group sent and delivered before the server sends its
2552 banner, but it's still worth sending as a group.
2553 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2554 the reverse. */
2555
2556 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2557 {
2558 sx->peer_offered = sx->ehlo_resp.crypted_features;
2559 if ((sx->early_pipe_active =
2560 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2561 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2562 }
2563 #endif
2564
2565 /* For SMTPS we need to wait for the initial OK response. */
2566 if (sx->smtps)
2567 #ifdef EXPERIMENTAL_PIPE_CONNECT
2568 if (sx->early_pipe_active)
2569 {
2570 sx->pending_BANNER = TRUE;
2571 sx->outblock.cmd_count = 1;
2572 }
2573 else
2574 #endif
2575 if (!smtp_reap_banner(sx))
2576 goto RESPONSE_FAILED;
2577
2578 if (sx->lmtp)
2579 greeting_cmd = US"LHLO";
2580 else if (sx->esmtp)
2581 greeting_cmd = US"EHLO";
2582 else
2583 {
2584 greeting_cmd = US"HELO";
2585 DEBUG(D_transport)
2586 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2587 }
2588
2589 if (smtp_write_command(sx,
2590 #ifdef EXPERIMENTAL_PIPE_CONNECT
2591 sx->early_pipe_active ? SCMD_BUFFER :
2592 #endif
2593 SCMD_FLUSH,
2594 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2595 goto SEND_FAILED;
2596
2597 #ifdef EXPERIMENTAL_PIPE_CONNECT
2598 if (sx->early_pipe_active)
2599 sx->pending_EHLO = TRUE;
2600 else
2601 #endif
2602 {
2603 if (!smtp_reap_ehlo(sx))
2604 goto RESPONSE_FAILED;
2605 smtp_peer_options = 0;
2606 }
2607 }
2608
2609 /* If the host is required to use a secure channel, ensure that we
2610 have one. */
2611
2612 else if ( sx->smtps
2613 # ifdef SUPPORT_DANE
2614 || sx->dane
2615 # endif
2616 # ifdef EXPERIMENTAL_REQUIRETLS
2617 || tls_requiretls & REQUIRETLS_MSG
2618 # endif
2619 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2620 )
2621 {
2622 errno =
2623 # ifdef EXPERIMENTAL_REQUIRETLS
2624 tls_requiretls & REQUIRETLS_MSG ? ERRNO_REQUIRETLS :
2625 # endif
2626 ERRNO_TLSREQUIRED;
2627 message = string_sprintf("a TLS session is required, but %s",
2628 smtp_peer_options & OPTION_TLS
2629 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2630 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2631 if (sx->dane)
2632 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2633 smtp_peer_options & OPTION_TLS
2634 ? US"validation-failure" /* could do with better detail */
2635 : US"starttls-not-supported");
2636 # endif
2637 goto TLS_FAILED;
2638 }
2639 #endif /*SUPPORT_TLS*/
2640
2641 /* If TLS is active, we have just started it up and re-done the EHLO command,
2642 so its response needs to be analyzed. If TLS is not active and this is a
2643 continued session down a previously-used socket, we haven't just done EHLO, so
2644 we skip this. */
2645
2646 if (continue_hostname == NULL
2647 #ifdef SUPPORT_TLS
2648 || tls_out.active.sock >= 0
2649 #endif
2650 )
2651 {
2652 if (sx->esmtp || sx->lmtp)
2653 {
2654 #ifdef EXPERIMENTAL_PIPE_CONNECT
2655 if (!sx->early_pipe_active)
2656 #endif
2657 {
2658 sx->peer_offered = ehlo_response(sx->buffer,
2659 0 /* no TLS */
2660 #ifdef EXPERIMENTAL_PIPE_CONNECT
2661 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2662 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2663 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8 | OPTION_REQUIRETLS
2664 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2665
2666 #else
2667
2668 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2669 | OPTION_CHUNKING
2670 | OPTION_PRDR
2671 # ifdef SUPPORT_I18N
2672 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2673 /*XXX if we hand peercaps on to continued-conn processes,
2674 must not depend on this addr */
2675 # endif
2676 | OPTION_DSN
2677 | OPTION_PIPE
2678 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2679 # if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2680 | (tls_requiretls & REQUIRETLS_MSG ? OPTION_REQUIRETLS : 0)
2681 # endif
2682 #endif
2683 );
2684 #ifdef EXPERIMENTAL_PIPE_CONNECT
2685 if (tls_out.active.sock >= 0)
2686 sx->ehlo_resp.crypted_features = sx->peer_offered;
2687 #endif
2688 }
2689
2690 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2691 lmtp_ignore_quota option was set. */
2692
2693 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2694
2695 /* If the response to EHLO specified support for the SIZE parameter, note
2696 this, provided size_addition is non-negative. */
2697
2698 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2699
2700 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2701 the current host, esmtp will be false, so PIPELINING can never be used. If
2702 the current host matches hosts_avoid_pipelining, don't do it. */
2703
2704 if ( sx->peer_offered & OPTION_PIPE
2705 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2706 smtp_peer_options |= OPTION_PIPE;
2707
2708 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2709 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2710
2711 if ( sx->peer_offered & OPTION_CHUNKING
2712 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2713 sx->peer_offered &= ~OPTION_CHUNKING;
2714
2715 if (sx->peer_offered & OPTION_CHUNKING)
2716 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2717
2718 #ifndef DISABLE_PRDR
2719 if ( sx->peer_offered & OPTION_PRDR
2720 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2721 sx->peer_offered &= ~OPTION_PRDR;
2722
2723 if (sx->peer_offered & OPTION_PRDR)
2724 DEBUG(D_transport) debug_printf("PRDR usable\n");
2725 #endif
2726
2727 /* Note if the server supports DSN */
2728 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2729 DEBUG(D_transport) debug_printf("%susing DSN\n",
2730 sx->peer_offered & OPTION_DSN ? "" : "not ");
2731
2732 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2733 if (sx->peer_offered & OPTION_REQUIRETLS)
2734 {
2735 smtp_peer_options |= OPTION_REQUIRETLS;
2736 DEBUG(D_transport) debug_printf(
2737 tls_requiretls & REQUIRETLS_MSG
2738 ? "using REQUIRETLS\n" : "REQUIRETLS offered\n");
2739 }
2740 #endif
2741
2742 #ifdef EXPERIMENTAL_PIPE_CONNECT
2743 if ( sx->early_pipe_ok
2744 && !sx->early_pipe_active
2745 && tls_out.active.sock >= 0
2746 && smtp_peer_options & OPTION_PIPE
2747 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2748 & OPTION_EARLY_PIPE)
2749 {
2750 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2751 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2752 write_ehlo_cache_entry(sx);
2753 }
2754 #endif
2755
2756 /* Note if the response to EHLO specifies support for the AUTH extension.
2757 If it has, check that this host is one we want to authenticate to, and do
2758 the business. The host name and address must be available when the
2759 authenticator's client driver is running. */
2760
2761 switch (yield = smtp_auth(sx))
2762 {
2763 default: goto SEND_QUIT;
2764 case OK: break;
2765 case FAIL_SEND: goto SEND_FAILED;
2766 case FAIL: goto RESPONSE_FAILED;
2767 }
2768 }
2769 }
2770 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2771
2772 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2773 message-specific. */
2774
2775 sx->setting_up = FALSE;
2776
2777 #ifdef SUPPORT_I18N
2778 if (sx->addrlist->prop.utf8_msg)
2779 {
2780 uschar * s;
2781
2782 /* If the transport sets a downconversion mode it overrides any set by ACL
2783 for the message. */
2784
2785 if ((s = ob->utf8_downconvert))
2786 {
2787 if (!(s = expand_string(s)))
2788 {
2789 message = string_sprintf("failed to expand utf8_downconvert: %s",
2790 expand_string_message);
2791 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2792 yield = DEFER;
2793 goto SEND_QUIT;
2794 }
2795 switch (*s)
2796 {
2797 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2798 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2799 break;
2800 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2801 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2802 break;
2803 case '-': if (s[1] == '1')
2804 {
2805 sx->addrlist->prop.utf8_downcvt = FALSE;
2806 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2807 }
2808 break;
2809 }
2810 }
2811
2812 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2813 && !sx->addrlist->prop.utf8_downcvt_maybe;
2814 DEBUG(D_transport) if (!sx->utf8_needed)
2815 debug_printf("utf8: %s downconvert\n",
2816 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2817 }
2818
2819 /* If this is an international message we need the host to speak SMTPUTF8 */
2820 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2821 {
2822 errno = ERRNO_UTF8_FWD;
2823 goto RESPONSE_FAILED;
2824 }
2825 #endif /*SUPPORT_I18N*/
2826
2827 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2828 /*XXX should tls_requiretls actually be per-addr? */
2829
2830 if ( tls_requiretls & REQUIRETLS_MSG
2831 && !(sx->peer_offered & OPTION_REQUIRETLS)
2832 )
2833 {
2834 sx->setting_up = TRUE;
2835 errno = ERRNO_REQUIRETLS;
2836 message = US"REQUIRETLS support is required from the server"
2837 " but it was not offered";
2838 DEBUG(D_transport) debug_printf("%s\n", message);
2839 goto TLS_FAILED;
2840 }
2841 #endif
2842
2843 return OK;
2844
2845
2846 {
2847 int code;
2848
2849 RESPONSE_FAILED:
2850 message = NULL;
2851 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2852 sx->buffer, &code, &message, &pass_message);
2853 yield = DEFER;
2854 goto FAILED;
2855
2856 SEND_FAILED:
2857 code = '4';
2858 message = US string_sprintf("send() to %s [%s] failed: %s",
2859 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2860 sx->send_quit = FALSE;
2861 yield = DEFER;
2862 goto FAILED;
2863
2864 EHLOHELO_FAILED:
2865 code = '4';
2866 message = string_sprintf("Remote host closed connection in response to %s"
2867 " (EHLO response was: %s)", smtp_command, sx->buffer);
2868 sx->send_quit = FALSE;
2869 yield = DEFER;
2870 goto FAILED;
2871
2872 /* This label is jumped to directly when a TLS negotiation has failed,
2873 or was not done for a host for which it is required. Values will be set
2874 in message and errno, and setting_up will always be true. Treat as
2875 a temporary error. */
2876
2877 #ifdef SUPPORT_TLS
2878 TLS_FAILED:
2879 # ifdef EXPERIMENTAL_REQUIRETLS
2880 if (errno == ERRNO_REQUIRETLS)
2881 code = '5', yield = FAIL;
2882 /*XXX DSN will be labelled 500; prefer 530 5.7.4 */
2883 else
2884 # endif
2885 code = '4', yield = DEFER;
2886 goto FAILED;
2887 #endif
2888
2889 /* The failure happened while setting up the call; see if the failure was
2890 a 5xx response (this will either be on connection, or following HELO - a 5xx
2891 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2892 fail all addresses, as this host is never going to accept them. For other
2893 errors during setting up (timeouts or whatever), defer all addresses, and
2894 yield DEFER, so that the host is not tried again for a while.
2895
2896 XXX This peeking for another host feels like a layering violation. We want
2897 to note the host as unusable, but down here we shouldn't know if this was
2898 the last host to try for the addr(list). Perhaps the upper layer should be
2899 the one to do set_errno() ? The problem is that currently the addr is where
2900 errno etc. are stashed, but until we run out of hosts to try the errors are
2901 host-specific. Maybe we should enhance the host_item definition? */
2902
2903 FAILED:
2904 sx->ok = FALSE; /* For when reached by GOTO */
2905 set_errno(sx->addrlist, errno, message,
2906 sx->conn_args.host->next
2907 ? DEFER
2908 : code == '5'
2909 #ifdef SUPPORT_I18N
2910 || errno == ERRNO_UTF8_FWD
2911 #endif
2912 ? FAIL : DEFER,
2913 pass_message, sx->conn_args.host
2914 #ifdef EXPERIMENTAL_DSN_INFO
2915 , sx->smtp_greeting, sx->helo_response
2916 #endif
2917 );
2918 }
2919
2920
2921 SEND_QUIT:
2922
2923 if (sx->send_quit)
2924 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2925
2926 #ifdef SUPPORT_TLS
2927 if (sx->cctx.tls_ctx)
2928 {
2929 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2930 sx->cctx.tls_ctx = NULL;
2931 }
2932 #endif
2933
2934 /* Close the socket, and return the appropriate value, first setting
2935 works because the NULL setting is passed back to the calling process, and
2936 remote_max_parallel is forced to 1 when delivering over an existing connection,
2937 */
2938
2939 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2940 if (sx->send_quit)
2941 {
2942 shutdown(sx->cctx.sock, SHUT_WR);
2943 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2944 for (rc = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2945 rc--; /* drain socket */
2946 sx->send_quit = FALSE;
2947 }
2948 (void)close(sx->cctx.sock);
2949 sx->cctx.sock = -1;
2950
2951 #ifndef DISABLE_EVENT
2952 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2953 #endif
2954
2955 continue_transport = NULL;
2956 continue_hostname = NULL;
2957 return yield;
2958 }
2959
2960
2961
2962
2963 /* Create the string of options that will be appended to the MAIL FROM:
2964 in the connection context buffer */
2965
2966 static int
2967 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2968 {
2969 uschar * p = sx->buffer;
2970 address_item * addr;
2971 int address_count;
2972
2973 *p = 0;
2974
2975 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2976 send it, adding something to the message size to allow for imprecision
2977 and things that get added en route. Exim keeps the number of lines
2978 in a message, so we can give an accurate value for the original message, but we
2979 need some additional to handle added headers. (Double "." characters don't get
2980 included in the count.) */
2981
2982 if ( message_size > 0
2983 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2984 {
2985 /*XXX problem here under spool_files_wireformat?
2986 Or just forget about lines? Or inflate by a fixed proportion? */
2987
2988 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2989 while (*p) p++;
2990 }
2991
2992 #ifndef DISABLE_PRDR
2993 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2994 request that */
2995
2996 sx->prdr_active = FALSE;
2997 if (sx->peer_offered & OPTION_PRDR)
2998 for (addr = addrlist; addr; addr = addr->next)
2999 if (addr->transport_return == PENDING_DEFER)
3000 {
3001 for (addr = addr->next; addr; addr = addr->next)
3002 if (addr->transport_return == PENDING_DEFER)
3003 { /* at least two recipients to send */
3004 sx->prdr_active = TRUE;
3005 sprintf(CS p, " PRDR"); p += 5;
3006 break;
3007 }
3008 break;
3009 }
3010 #endif
3011
3012 #ifdef SUPPORT_I18N
3013 /* If it supports internationalised messages, and this meesage need that,
3014 request it */
3015
3016 if ( sx->peer_offered & OPTION_UTF8
3017 && addrlist->prop.utf8_msg
3018 && !addrlist->prop.utf8_downcvt
3019 )
3020 Ustrcpy(p, " SMTPUTF8"), p += 9;
3021 #endif
3022
3023 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
3024 if (tls_requiretls & REQUIRETLS_MSG)
3025 Ustrcpy(p, " REQUIRETLS") , p += 11;
3026 #endif
3027
3028 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3029 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3030 addr && address_count < sx->max_rcpt;
3031 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3032 {
3033 address_count++;
3034 if (!(addr->dsn_flags & rf_dsnlasthop))
3035 {
3036 sx->dsn_all_lasthop = FALSE;
3037 break;
3038 }
3039 }
3040
3041 /* Add any DSN flags to the mail command */
3042
3043 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3044 {
3045 if (dsn_ret == dsn_ret_hdrs)
3046 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3047 else if (dsn_ret == dsn_ret_full)
3048 { Ustrcpy(p, " RET=FULL"); p += 9; }
3049
3050 if (dsn_envid)
3051 {
3052 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3053 while (*p) p++;
3054 }
3055 }
3056
3057 /* If an authenticated_sender override has been specified for this transport
3058 instance, expand it. If the expansion is forced to fail, and there was already
3059 an authenticated_sender for this message, the original value will be used.
3060 Other expansion failures are serious. An empty result is ignored, but there is
3061 otherwise no check - this feature is expected to be used with LMTP and other
3062 cases where non-standard addresses (e.g. without domains) might be required. */
3063
3064 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3065 return ERROR;
3066
3067 return OK;
3068 }
3069
3070
3071 static void
3072 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3073 {
3074 uschar * p = sx->buffer;
3075 *p = 0;
3076
3077 /* Add any DSN flags to the rcpt command */
3078
3079 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3080 {
3081 if (addr->dsn_flags & rf_dsnflags)
3082 {
3083 int i;
3084 BOOL first = TRUE;
3085
3086 Ustrcpy(p, " NOTIFY=");
3087 while (*p) p++;
3088 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3089 {
3090 if (!first) *p++ = ',';
3091 first = FALSE;
3092 Ustrcpy(p, rf_names[i]);
3093 while (*p) p++;
3094 }
3095 }
3096
3097 if (addr->dsn_orcpt)
3098 {
3099 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3100 addr->dsn_orcpt);
3101 while (*p) p++;
3102 }
3103 }
3104 }
3105
3106
3107
3108 /*
3109 Return:
3110 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3111 -1 MAIL response error
3112 -2 any non-MAIL read i/o error
3113 -3 non-MAIL response timeout
3114 -4 internal error; channel still usable
3115 -5 transmit failed
3116 */
3117
3118 int
3119 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3120 {
3121 address_item * addr;
3122 int address_count;
3123 int rc;
3124
3125 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3126 {
3127 *yield = ERROR;
3128 return -4;
3129 }
3130
3131 /* From here until we send the DATA command, we can make use of PIPELINING
3132 if the server host supports it. The code has to be able to check the responses
3133 at any point, for when the buffer fills up, so we write it totally generally.
3134 When PIPELINING is off, each command written reports that it has flushed the
3135 buffer. */
3136
3137 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3138
3139 {
3140 uschar * s = sx->from_addr;
3141 #ifdef SUPPORT_I18N
3142 uschar * errstr = NULL;
3143
3144 /* If we must downconvert, do the from-address here. Remember we had to
3145 for the to-addresses (done below), and also (ugly) for re-doing when building
3146 the delivery log line. */
3147
3148 if ( sx->addrlist->prop.utf8_msg
3149 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3150 )
3151 {
3152 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3153 {
3154 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3155 *yield = ERROR;
3156 return -4;
3157 }
3158 setflag(sx->addrlist, af_utf8_downcvt);
3159 }
3160 #endif
3161
3162 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3163 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3164 }
3165
3166 mail_command = string_copy(big_buffer); /* Save for later error message */
3167
3168 switch(rc)
3169 {
3170 case -1: /* Transmission error */
3171 return -5;
3172
3173 case +1: /* Cmd was sent */
3174 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3175 (SOB sx->conn_args.ob)->command_timeout))
3176 {
3177 if (errno == 0 && sx->buffer[0] == '4')
3178 {
3179 errno = ERRNO_MAIL4XX;
3180 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3181 }
3182 return -1;
3183 }
3184 sx->pending_MAIL = FALSE;
3185 break;
3186
3187 /* otherwise zero: command queued for pipeline */
3188 }
3189
3190 /* Pass over all the relevant recipient addresses for this host, which are the
3191 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3192 several before we have to read the responses for those seen so far. This
3193 checking is done by a subroutine because it also needs to be done at the end.
3194 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3195 the next one if not all are sent.
3196
3197 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3198 last address because we want to abort if any recipients have any kind of
3199 problem, temporary or permanent. We know that all recipient addresses will have
3200 the PENDING_DEFER status, because only one attempt is ever made, and we know
3201 that max_rcpt will be large, so all addresses will be done at once.
3202
3203 For verify we flush the pipeline after any (the only) rcpt address. */
3204
3205 for (addr = sx->first_addr, address_count = 0;
3206 addr && address_count < sx->max_rcpt;
3207 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3208 {
3209 int count;
3210 BOOL no_flush;
3211 uschar * rcpt_addr;
3212
3213 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3214 ? dsn_support_yes : dsn_support_no;
3215
3216 address_count++;
3217 no_flush = pipelining_active && !sx->verify
3218 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3219
3220 build_rcptcmd_options(sx, addr);
3221
3222 /* Now send the RCPT command, and process outstanding responses when
3223 necessary. After a timeout on RCPT, we just end the function, leaving the
3224 yield as OK, because this error can often mean that there is a problem with
3225 just one address, so we don't want to delay the host. */
3226
3227 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3228
3229 #ifdef SUPPORT_I18N
3230 if ( testflag(sx->addrlist, af_utf8_downcvt)
3231 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3232 )
3233 {
3234 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3235 errno = ERRNO_EXPANDFAIL;
3236 return -5; /*XXX too harsh? */
3237 }
3238 #endif
3239
3240 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3241 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3242
3243 if (count < 0) return -5;
3244 if (count > 0)
3245 {
3246 switch(sync_responses(sx, count, 0))
3247 {
3248 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3249 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3250 break;
3251
3252 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3253 if (!sx->lmtp) /* can't tell about progress yet */
3254 sx->completed_addr = TRUE;
3255 case 0: /* No 2xx or 5xx, but no probs */
3256 break;
3257
3258 case -1: return -3; /* Timeout on RCPT */
3259 case -2: return -2; /* non-MAIL read i/o error */
3260 default: return -1; /* any MAIL error */
3261
3262 #ifdef EXPERIMENTAL_PIPE_CONNECT
3263 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3264 #endif
3265 }
3266 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3267 }
3268 } /* Loop for next address */
3269
3270 sx->next_addr = addr;
3271 return 0;
3272 }
3273
3274
3275 #ifdef SUPPORT_TLS
3276 /*****************************************************
3277 * Proxy TLS connection for another transport process *
3278 ******************************************************/
3279 /*
3280 Close the unused end of the pipe, fork once more, then use the given buffer
3281 as a staging area, and select on both the given fd and the TLS'd client-fd for
3282 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).