Fix expansions for RFC 822 addresses having comments in local-part and/or domain...
[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 int orvalue = 0;
501 if (errno_value == ERRNO_CONNECTTIMEOUT)
502 {
503 errno_value = ETIMEDOUT;
504 orvalue = RTEF_CTOUT;
505 }
506 for (address_item * addr = addrlist; addr; addr = addr->next)
507 if (addr->transport_return >= PENDING)
508 {
509 addr->basic_errno = errno_value;
510 addr->more_errno |= orvalue;
511 if (msg)
512 {
513 addr->message = msg;
514 if (pass_message) setflag(addr, af_pass_message);
515 }
516 addr->transport_return = rc;
517 if (host)
518 {
519 addr->host_used = host;
520 #ifdef EXPERIMENTAL_DSN_INFO
521 if (smtp_greeting)
522 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
523 addr->smtp_greeting = smtp_greeting;
524
525 if (helo_response)
526 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
527 addr->helo_response = helo_response;
528 #endif
529 }
530 }
531 }
532
533 static void
534 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
535 BOOL pass_message)
536 {
537 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
538 #ifdef EXPERIMENTAL_DSN_INFO
539 , NULL, NULL
540 #endif
541 );
542 }
543
544
545 /*************************************************
546 * Check an SMTP response *
547 *************************************************/
548
549 /* This function is given an errno code and the SMTP response buffer
550 to analyse, together with the host identification for generating messages. It
551 sets an appropriate message and puts the first digit of the response code into
552 the yield variable. If no response was actually read, a suitable digit is
553 chosen.
554
555 Arguments:
556 host the current host, to get its name for messages
557 errno_value pointer to the errno value
558 more_errno from the top address for use with ERRNO_FILTER_FAIL
559 buffer the SMTP response buffer
560 yield where to put a one-digit SMTP response code
561 message where to put an error message
562 pass_message set TRUE if message is an SMTP response
563
564 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
565 */
566
567 static BOOL
568 check_response(host_item *host, int *errno_value, int more_errno,
569 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
570 {
571 uschar * pl = pipelining_active ? US"pipelined " : US"";
572 const uschar * s;
573
574 *yield = '4'; /* Default setting is to give a temporary error */
575
576 switch(*errno_value)
577 {
578 case ETIMEDOUT: /* Handle response timeout */
579 *message = US string_sprintf("SMTP timeout after %s%s",
580 pl, smtp_command);
581 if (transport_count > 0)
582 *message = US string_sprintf("%s (%d bytes written)", *message,
583 transport_count);
584 return FALSE;
585
586 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
587 s = string_printing(buffer);
588 while (isspace(*s)) s++;
589 *message = *s == 0
590 ? string_sprintf("Malformed SMTP reply (an empty line) "
591 "in response to %s%s", pl, smtp_command)
592 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
593 pl, smtp_command, s);
594 return FALSE;
595
596 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
597 GnuTLS and TLS1.3 */
598 *message = US"bad first read from TLS conn";
599 return TRUE;
600
601 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
602 can't send QUIT as we mustn't end the DATA. */
603 *message = string_sprintf("transport filter process failed (%d)%s",
604 more_errno,
605 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
606 return FALSE;
607
608 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
609 can't send QUIT as we mustn't end the DATA. */
610 *message =
611 string_sprintf("failed to expand headers_add or headers_remove: %s",
612 expand_string_message);
613 return FALSE;
614
615 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
616 *message = string_sprintf("failed to write a data block");
617 return FALSE;
618
619 #ifdef SUPPORT_I18N
620 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
621 *message = US"utf8 support required but not offered for forwarding";
622 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
623 return TRUE;
624 #endif
625 }
626
627 /* Handle error responses from the remote mailer. */
628
629 if (buffer[0] != 0)
630 {
631 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
632 "%s", pl, smtp_command, s = string_printing(buffer));
633 *pass_message = TRUE;
634 *yield = buffer[0];
635 return TRUE;
636 }
637
638 /* No data was read. If there is no errno, this must be the EOF (i.e.
639 connection closed) case, which causes deferral. An explicit connection reset
640 error has the same effect. Otherwise, put the host's identity in the message,
641 leaving the errno value to be interpreted as well. In all cases, we have to
642 assume the connection is now dead. */
643
644 if (*errno_value == 0 || *errno_value == ECONNRESET)
645 {
646 *errno_value = ERRNO_SMTPCLOSED;
647 *message = US string_sprintf("Remote host closed connection "
648 "in response to %s%s", pl, smtp_command);
649 }
650 else
651 *message = US string_sprintf("%s [%s]", host->name, host->address);
652
653 return FALSE;
654 }
655
656
657
658 /*************************************************
659 * Write error message to logs *
660 *************************************************/
661
662 /* This writes to the main log and to the message log.
663
664 Arguments:
665 host the current host
666 detail the current message (addr_item->message)
667 basic_errno the errno (addr_item->basic_errno)
668
669 Returns: nothing
670 */
671
672 static void
673 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
674 {
675 gstring * message = LOGGING(outgoing_port)
676 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
677 host->port == PORT_NONE ? 25 : host->port)
678 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
679
680 if (suffix)
681 {
682 message = string_fmt_append(message, ": %s", suffix);
683 if (basic_errno > 0)
684 message = string_fmt_append(message, ": %s", strerror(basic_errno));
685 }
686 else
687 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
688
689 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
690 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
691 }
692
693 static void
694 msglog_line(host_item * host, uschar * message)
695 {
696 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
697 host->name, host->address, message);
698 }
699
700
701
702 #ifndef DISABLE_EVENT
703 /*************************************************
704 * Post-defer action *
705 *************************************************/
706
707 /* This expands an arbitrary per-transport string.
708 It might, for example, be used to write to the database log.
709
710 Arguments:
711 addr the address item containing error information
712 host the current host
713
714 Returns: nothing
715 */
716
717 static void
718 deferred_event_raise(address_item *addr, host_item *host)
719 {
720 uschar * action = addr->transport->event_action;
721 const uschar * save_domain;
722 uschar * save_local;
723
724 if (!action)
725 return;
726
727 save_domain = deliver_domain;
728 save_local = deliver_localpart;
729
730 /*XXX would ip & port already be set up? */
731 deliver_host_address = string_copy(host->address);
732 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
733 event_defer_errno = addr->basic_errno;
734
735 router_name = addr->router->name;
736 transport_name = addr->transport->name;
737 deliver_domain = addr->domain;
738 deliver_localpart = addr->local_part;
739
740 (void) event_raise(action, US"msg:host:defer",
741 addr->message
742 ? addr->basic_errno > 0
743 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
744 : string_copy(addr->message)
745 : addr->basic_errno > 0
746 ? string_copy(US strerror(addr->basic_errno))
747 : NULL);
748
749 deliver_localpart = save_local;
750 deliver_domain = save_domain;
751 router_name = transport_name = NULL;
752 }
753 #endif
754
755 /*************************************************
756 * Reap SMTP specific responses *
757 *************************************************/
758 static int
759 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
760 int count)
761 {
762 uschar flushbuffer[4096];
763
764 while (count-- > 0)
765 {
766 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
767 '2', ob->command_timeout)
768 && (errno != 0 || flushbuffer[0] == 0))
769 break;
770 }
771 return count;
772 }
773
774
775 /* Return boolean success */
776
777 static BOOL
778 smtp_reap_banner(smtp_context * sx)
779 {
780 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
781 '2', (SOB sx->conn_args.ob)->command_timeout);
782 #ifdef EXPERIMENTAL_DSN_INFO
783 sx->smtp_greeting = string_copy(sx->buffer);
784 #endif
785 return good_response;
786 }
787
788 static BOOL
789 smtp_reap_ehlo(smtp_context * sx)
790 {
791 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
792 (SOB sx->conn_args.ob)->command_timeout))
793 {
794 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
795 {
796 #ifdef EXPERIMENTAL_DSN_INFO
797 sx->helo_response = string_copy(sx->buffer);
798 #endif
799 return FALSE;
800 }
801 sx->esmtp = FALSE;
802 }
803 #ifdef EXPERIMENTAL_DSN_INFO
804 sx->helo_response = string_copy(sx->buffer);
805 #endif
806 return TRUE;
807 }
808
809
810
811 #ifdef EXPERIMENTAL_PIPE_CONNECT
812 static uschar *
813 ehlo_cache_key(const smtp_context * sx)
814 {
815 host_item * host = sx->conn_args.host;
816 return Ustrchr(host->address, ':')
817 ? string_sprintf("[%s]:%d.EHLO", host->address,
818 host->port == PORT_NONE ? sx->port : host->port)
819 : string_sprintf("%s:%d.EHLO", host->address,
820 host->port == PORT_NONE ? sx->port : host->port);
821 }
822
823 static void
824 write_ehlo_cache_entry(const smtp_context * sx)
825 {
826 open_db dbblock, * dbm_file;
827
828 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
829 {
830 uschar * ehlo_resp_key = ehlo_cache_key(sx);
831 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
832
833 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
834 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
835 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
836
837 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
838 dbfn_close(dbm_file);
839 }
840 }
841
842 static void
843 invalidate_ehlo_cache_entry(smtp_context * sx)
844 {
845 open_db dbblock, * dbm_file;
846
847 if ( sx->early_pipe_active
848 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
849 {
850 uschar * ehlo_resp_key = ehlo_cache_key(sx);
851 dbfn_delete(dbm_file, ehlo_resp_key);
852 dbfn_close(dbm_file);
853 }
854 }
855
856 static BOOL
857 read_ehlo_cache_entry(smtp_context * sx)
858 {
859 open_db dbblock;
860 open_db * dbm_file;
861
862 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE)))
863 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
864 else
865 {
866 uschar * ehlo_resp_key = ehlo_cache_key(sx);
867 dbdata_ehlo_resp * er;
868
869 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
870 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
871 else if (time(NULL) - er->time_stamp > retry_data_expire)
872 {
873 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
874 dbfn_close(dbm_file);
875 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
876 dbfn_delete(dbm_file, ehlo_resp_key);
877 }
878 else
879 {
880 sx->ehlo_resp = er->data;
881 dbfn_close(dbm_file);
882 DEBUG(D_transport) debug_printf(
883 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
884 er->data.cleartext_features, er->data.crypted_features);
885 return TRUE;
886 }
887 dbfn_close(dbm_file);
888 }
889 return FALSE;
890 }
891
892
893
894 /* Return an auths bitmap for the set of AUTH methods offered by the server
895 which match our authenticators. */
896
897 static unsigned short
898 study_ehlo_auths(smtp_context * sx)
899 {
900 uschar * names;
901 auth_instance * au;
902 uschar authnum;
903 unsigned short authbits = 0;
904
905 if (!sx->esmtp) return 0;
906 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
907 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
908 expand_nmax = -1; /* reset */
909 names = string_copyn(expand_nstring[1], expand_nlength[1]);
910
911 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
912 {
913 const uschar * list = names;
914 int sep = ' ';
915 uschar name[32];
916
917 while (string_nextinlist(&list, &sep, name, sizeof(name)))
918 if (strcmpic(au->public_name, name) == 0)
919 { authbits |= BIT(authnum); break; }
920 }
921
922 DEBUG(D_transport)
923 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
924 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
925
926 if (tls_out.active.sock >= 0)
927 sx->ehlo_resp.crypted_auths = authbits;
928 else
929 sx->ehlo_resp.cleartext_auths = authbits;
930 return authbits;
931 }
932
933
934
935
936 /* Wait for and check responses for early-pipelining.
937
938 Called from the lower-level smtp_read_response() function
939 used for general code that assume synchronisation, if context
940 flags indicate outstanding early-pipelining commands. Also
941 called fom sync_responses() which handles pipelined commands.
942
943 Arguments:
944 sx smtp connection context
945 countp number of outstanding responses, adjusted on return
946
947 Return:
948 OK all well
949 DEFER error on first read of TLS'd conn
950 FAIL SMTP error in response
951 */
952 int
953 smtp_reap_early_pipe(smtp_context * sx, int * countp)
954 {
955 BOOL pending_BANNER = sx->pending_BANNER;
956 BOOL pending_EHLO = sx->pending_EHLO;
957 int rc = FAIL;
958
959 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
960 sx->pending_EHLO = FALSE;
961
962 if (pending_BANNER)
963 {
964 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
965 (*countp)--;
966 if (!smtp_reap_banner(sx))
967 {
968 DEBUG(D_transport) debug_printf("bad banner\n");
969 if (tls_out.active.sock >= 0) rc = DEFER;
970 goto fail;
971 }
972 }
973
974 if (pending_EHLO)
975 {
976 unsigned peer_offered;
977 unsigned short authbits = 0, * ap;
978
979 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
980 (*countp)--;
981 if (!smtp_reap_ehlo(sx))
982 {
983 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
984 if (tls_out.active.sock >= 0) rc = DEFER;
985 goto fail;
986 }
987
988 /* Compare the actual EHLO response to the cached value we assumed;
989 on difference, dump or rewrite the cache and arrange for a retry. */
990
991 ap = tls_out.active.sock < 0
992 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
993
994 peer_offered = ehlo_response(sx->buffer,
995 (tls_out.active.sock < 0 ? OPTION_TLS : OPTION_REQUIRETLS)
996 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
997 | OPTION_UTF8 | OPTION_EARLY_PIPE
998 );
999 if ( peer_offered != sx->peer_offered
1000 || (authbits = study_ehlo_auths(sx)) != *ap)
1001 {
1002 HDEBUG(D_transport)
1003 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1004 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1005 sx->peer_offered, *ap, peer_offered, authbits);
1006 *(tls_out.active.sock < 0
1007 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1008 *ap = authbits;
1009 if (peer_offered & OPTION_EARLY_PIPE)
1010 write_ehlo_cache_entry(sx);
1011 else
1012 invalidate_ehlo_cache_entry(sx);
1013
1014 return OK; /* just carry on */
1015 }
1016 }
1017 return OK;
1018
1019 fail:
1020 invalidate_ehlo_cache_entry(sx);
1021 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1022 return rc;
1023 }
1024 #endif
1025
1026
1027 /*************************************************
1028 * Synchronize SMTP responses *
1029 *************************************************/
1030
1031 /* This function is called from smtp_deliver() to receive SMTP responses from
1032 the server, and match them up with the commands to which they relate. When
1033 PIPELINING is not in use, this function is called after every command, and is
1034 therefore somewhat over-engineered, but it is simpler to use a single scheme
1035 that works both with and without PIPELINING instead of having two separate sets
1036 of code.
1037
1038 The set of commands that are buffered up with pipelining may start with MAIL
1039 and may end with DATA; in between are RCPT commands that correspond to the
1040 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1041 etc.) are never buffered.
1042
1043 Errors after MAIL or DATA abort the whole process leaving the response in the
1044 buffer. After MAIL, pending responses are flushed, and the original command is
1045 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1046 permitted to reject some recipient addresses while accepting others. However
1047 certain errors clearly abort the whole process. Set the value in
1048 transport_return to PENDING_OK if the address is accepted. If there is a
1049 subsequent general error, it will get reset accordingly. If not, it will get
1050 converted to OK at the end.
1051
1052 Arguments:
1053 sx smtp connection context
1054 count the number of responses to read
1055 pending_DATA 0 if last command sent was not DATA
1056 +1 if previously had a good recipient
1057 -1 if not previously had a good recipient
1058
1059 Returns: 3 if at least one address had 2xx and one had 5xx
1060 2 if at least one address had 5xx but none had 2xx
1061 1 if at least one host had a 2xx response, but none had 5xx
1062 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1063 -1 timeout while reading RCPT response
1064 -2 I/O or other non-response error for RCPT
1065 -3 DATA or MAIL failed - errno and buffer set
1066 -4 banner or EHLO failed (early-pipelining)
1067 -5 banner or EHLO failed (early-pipelining, TLS)
1068 */
1069
1070 static int
1071 sync_responses(smtp_context * sx, int count, int pending_DATA)
1072 {
1073 address_item * addr = sx->sync_addr;
1074 smtp_transport_options_block * ob = sx->conn_args.ob;
1075 int yield = 0;
1076 int rc;
1077
1078 #ifdef EXPERIMENTAL_PIPE_CONNECT
1079 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1080 return rc == FAIL ? -4 : -5;
1081 #endif
1082
1083 /* Handle the response for a MAIL command. On error, reinstate the original
1084 command in big_buffer for error message use, and flush any further pending
1085 responses before returning, except after I/O errors and timeouts. */
1086
1087 if (sx->pending_MAIL)
1088 {
1089 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1090 count--;
1091 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1092 '2', ob->command_timeout))
1093 {
1094 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1095 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1096 if (errno == ERRNO_TLSFAILURE)
1097 return -5;
1098 if (errno == 0 && sx->buffer[0] != 0)
1099 {
1100 int save_errno = 0;
1101 if (sx->buffer[0] == '4')
1102 {
1103 save_errno = ERRNO_MAIL4XX;
1104 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1105 }
1106 count = smtp_discard_responses(sx, ob, count);
1107 errno = save_errno;
1108 }
1109
1110 if (pending_DATA) count--; /* Number of RCPT responses to come */
1111 while (count-- > 0) /* Mark any pending addrs with the host used */
1112 {
1113 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1114 addr->host_used = sx->conn_args.host;
1115 addr = addr->next;
1116 }
1117 return -3;
1118 }
1119 }
1120
1121 if (pending_DATA) count--; /* Number of RCPT responses to come */
1122
1123 /* Read and handle the required number of RCPT responses, matching each one up
1124 with an address by scanning for the next address whose status is PENDING_DEFER.
1125 */
1126
1127 while (count-- > 0)
1128 {
1129 while (addr->transport_return != PENDING_DEFER)
1130 if (!(addr = addr->next))
1131 return -2;
1132
1133 /* The address was accepted */
1134 addr->host_used = sx->conn_args.host;
1135
1136 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1137 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1138 '2', ob->command_timeout))
1139 {
1140 yield |= 1;
1141 addr->transport_return = PENDING_OK;
1142
1143 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1144 ensure that any address-specific retry record is expunged. We do this both
1145 for the basic key and for the version that also includes the sender. */
1146
1147 if (testflag(addr, af_dr_retry_exists))
1148 {
1149 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1150 sender_address);
1151 retry_add_item(addr, altkey, rf_delete);
1152 retry_add_item(addr, addr->address_retry_key, rf_delete);
1153 }
1154 }
1155
1156 /* Error on first TLS read */
1157
1158 else if (errno == ERRNO_TLSFAILURE)
1159 return -5;
1160
1161 /* Timeout while reading the response */
1162
1163 else if (errno == ETIMEDOUT)
1164 {
1165 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1166 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1167 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1168 retry_add_item(addr, addr->address_retry_key, 0);
1169 update_waiting = FALSE;
1170 return -1;
1171 }
1172
1173 /* Handle other errors in obtaining an SMTP response by returning -1. This
1174 will cause all the addresses to be deferred. Restore the SMTP command in
1175 big_buffer for which we are checking the response, so the error message
1176 makes sense. */
1177
1178 else if (errno != 0 || sx->buffer[0] == 0)
1179 {
1180 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
1181 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1182 return -2;
1183 }
1184
1185 /* Handle SMTP permanent and temporary response codes. */
1186
1187 else
1188 {
1189 addr->message =
1190 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1191 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1192 string_printing(sx->buffer));
1193 setflag(addr, af_pass_message);
1194 if (!sx->verify)
1195 msglog_line(sx->conn_args.host, addr->message);
1196
1197 /* The response was 5xx */
1198
1199 if (sx->buffer[0] == '5')
1200 {
1201 addr->transport_return = FAIL;
1202 yield |= 2;
1203 }
1204
1205 /* The response was 4xx */
1206
1207 else
1208 {
1209 addr->transport_return = DEFER;
1210 addr->basic_errno = ERRNO_RCPT4XX;
1211 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1212
1213 if (!sx->verify)
1214 {
1215 #ifndef DISABLE_EVENT
1216 event_defer_errno = addr->more_errno;
1217 msg_event_raise(US"msg:rcpt:host:defer", addr);
1218 #endif
1219
1220 /* Log temporary errors if there are more hosts to be tried.
1221 If not, log this last one in the == line. */
1222
1223 if (sx->conn_args.host->next)
1224 if (LOGGING(outgoing_port))
1225 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1226 sx->conn_args.host->address,
1227 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1228 else
1229 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1230 sx->conn_args.host->address, addr->message);
1231
1232 #ifndef DISABLE_EVENT
1233 else
1234 msg_event_raise(US"msg:rcpt:defer", addr);
1235 #endif
1236
1237 /* Do not put this message on the list of those waiting for specific
1238 hosts, as otherwise it is likely to be tried too often. */
1239
1240 update_waiting = FALSE;
1241
1242 /* Add a retry item for the address so that it doesn't get tried again
1243 too soon. If address_retry_include_sender is true, add the sender address
1244 to the retry key. */
1245
1246 retry_add_item(addr,
1247 ob->address_retry_include_sender
1248 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1249 : addr->address_retry_key,
1250 0);
1251 }
1252 }
1253 }
1254 } /* Loop for next RCPT response */
1255
1256 /* Update where to start at for the next block of responses, unless we
1257 have already handled all the addresses. */
1258
1259 if (addr) sx->sync_addr = addr->next;
1260
1261 /* Handle a response to DATA. If we have not had any good recipients, either
1262 previously or in this block, the response is ignored. */
1263
1264 if (pending_DATA != 0)
1265 {
1266 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1267 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1268 '3', ob->command_timeout))
1269 {
1270 int code;
1271 uschar *msg;
1272 BOOL pass_message;
1273
1274 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1275 return -5;
1276
1277 if (pending_DATA > 0 || (yield & 1) != 0)
1278 {
1279 if (errno == 0 && sx->buffer[0] == '4')
1280 {
1281 errno = ERRNO_DATA4XX;
1282 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1283 }
1284 return -3;
1285 }
1286 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1287 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1288 "is in use and there were no good recipients\n", msg);
1289 }
1290 }
1291
1292 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1293 present) received 3xx. If any RCPTs were handled and yielded anything other
1294 than 4xx, yield will be set non-zero. */
1295
1296 return yield;
1297 }
1298
1299
1300
1301
1302
1303 /* Try an authenticator's client entry */
1304
1305 static int
1306 try_authenticator(smtp_context * sx, auth_instance * au)
1307 {
1308 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1309 host_item * host = sx->conn_args.host; /* host to deliver to */
1310 int rc;
1311
1312 sx->outblock.authenticating = TRUE;
1313 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1314 sx->buffer, sizeof(sx->buffer));
1315 sx->outblock.authenticating = FALSE;
1316 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1317
1318 /* A temporary authentication failure must hold up delivery to
1319 this host. After a permanent authentication failure, we carry on
1320 to try other authentication methods. If all fail hard, try to
1321 deliver the message unauthenticated unless require_auth was set. */
1322
1323 switch(rc)
1324 {
1325 case OK:
1326 f.smtp_authenticated = TRUE; /* stops the outer loop */
1327 client_authenticator = au->name;
1328 if (au->set_client_id)
1329 client_authenticated_id = expand_string(au->set_client_id);
1330 break;
1331
1332 /* Failure after writing a command */
1333
1334 case FAIL_SEND:
1335 return FAIL_SEND;
1336
1337 /* Failure after reading a response */
1338
1339 case FAIL:
1340 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1341 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1342 au->name, host->name, host->address, sx->buffer);
1343 break;
1344
1345 /* Failure by some other means. In effect, the authenticator
1346 decided it wasn't prepared to handle this case. Typically this
1347 is the result of "fail" in an expansion string. Do we need to
1348 log anything here? Feb 2006: a message is now put in the buffer
1349 if logging is required. */
1350
1351 case CANCELLED:
1352 if (*sx->buffer != 0)
1353 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1354 "authentication H=%s [%s] %s", au->name, host->name,
1355 host->address, sx->buffer);
1356 break;
1357
1358 /* Internal problem, message in buffer. */
1359
1360 case ERROR:
1361 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1362 DEFER, FALSE);
1363 return ERROR;
1364 }
1365 return OK;
1366 }
1367
1368
1369
1370
1371 /* Do the client side of smtp-level authentication.
1372
1373 Arguments:
1374 sx smtp connection context
1375
1376 sx->buffer should have the EHLO response from server (gets overwritten)
1377
1378 Returns:
1379 OK Success, or failed (but not required): global "smtp_authenticated" set
1380 DEFER Failed authentication (and was required)
1381 ERROR Internal problem
1382
1383 FAIL_SEND Failed communications - transmit
1384 FAIL - response
1385 */
1386
1387 static int
1388 smtp_auth(smtp_context * sx)
1389 {
1390 host_item * host = sx->conn_args.host; /* host to deliver to */
1391 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1392 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1393 #ifdef EXPERIMENTAL_PIPE_CONNECT
1394 unsigned short authbits = tls_out.active.sock >= 0
1395 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1396 #endif
1397 uschar * fail_reason = US"server did not advertise AUTH support";
1398
1399 f.smtp_authenticated = FALSE;
1400 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1401
1402 if (!regex_AUTH)
1403 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1404
1405 /* Is the server offering AUTH? */
1406
1407 if ( sx->esmtp
1408 &&
1409 #ifdef EXPERIMENTAL_PIPE_CONNECT
1410 sx->early_pipe_active ? authbits
1411 :
1412 #endif
1413 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1414 )
1415 {
1416 uschar * names = NULL;
1417 expand_nmax = -1; /* reset */
1418
1419 #ifdef EXPERIMENTAL_PIPE_CONNECT
1420 if (!sx->early_pipe_active)
1421 #endif
1422 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1423
1424 /* Must not do this check until after we have saved the result of the
1425 regex match above as the check could be another RE. */
1426
1427 if ( require_auth == OK
1428 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1429 {
1430 auth_instance * au;
1431
1432 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1433 fail_reason = US"no common mechanisms were found";
1434
1435 #ifdef EXPERIMENTAL_PIPE_CONNECT
1436 if (sx->early_pipe_active)
1437 {
1438 /* Scan our authenticators (which support use by a client and were offered
1439 by the server (checked at cache-write time)), not suppressed by
1440 client_condition. If one is found, attempt to authenticate by calling its
1441 client function. We are limited to supporting up to 16 authenticator
1442 public-names by the number of bits in a short. */
1443
1444 uschar bitnum;
1445 int rc;
1446
1447 for (bitnum = 0, au = auths;
1448 !f.smtp_authenticated && au && bitnum < 16;
1449 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1450 {
1451 if ( au->client_condition
1452 && !expand_check_condition(au->client_condition, au->name,
1453 US"client authenticator"))
1454 {
1455 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1456 au->name, "client_condition is false");
1457 continue;
1458 }
1459
1460 /* Found data for a listed mechanism. Call its client entry. Set
1461 a flag in the outblock so that data is overwritten after sending so
1462 that reflections don't show it. */
1463
1464 fail_reason = US"authentication attempt(s) failed";
1465
1466 if ((rc = try_authenticator(sx, au)) != OK)
1467 return rc;
1468 }
1469 }
1470 else
1471 #endif
1472
1473 /* Scan the configured authenticators looking for one which is configured
1474 for use as a client, which is not suppressed by client_condition, and
1475 whose name matches an authentication mechanism supported by the server.
1476 If one is found, attempt to authenticate by calling its client function.
1477 */
1478
1479 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1480 {
1481 uschar *p = names;
1482
1483 if ( !au->client
1484 || ( au->client_condition
1485 && !expand_check_condition(au->client_condition, au->name,
1486 US"client authenticator")))
1487 {
1488 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1489 au->name,
1490 (au->client)? "client_condition is false" :
1491 "not configured as a client");
1492 continue;
1493 }
1494
1495 /* Loop to scan supported server mechanisms */
1496
1497 while (*p)
1498 {
1499 int len = Ustrlen(au->public_name);
1500 int rc;
1501
1502 while (isspace(*p)) p++;
1503
1504 if (strncmpic(au->public_name, p, len) != 0 ||
1505 (p[len] != 0 && !isspace(p[len])))
1506 {
1507 while (*p != 0 && !isspace(*p)) p++;
1508 continue;
1509 }
1510
1511 /* Found data for a listed mechanism. Call its client entry. Set
1512 a flag in the outblock so that data is overwritten after sending so
1513 that reflections don't show it. */
1514
1515 fail_reason = US"authentication attempt(s) failed";
1516
1517 if ((rc = try_authenticator(sx, au)) != OK)
1518 return rc;
1519
1520 break; /* If not authenticated, try next authenticator */
1521 } /* Loop for scanning supported server mechanisms */
1522 } /* Loop for further authenticators */
1523 }
1524 }
1525
1526 /* If we haven't authenticated, but are required to, give up. */
1527
1528 if (require_auth == OK && !f.smtp_authenticated)
1529 {
1530 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1531 string_sprintf("authentication required but %s", fail_reason), DEFER,
1532 FALSE);
1533 return DEFER;
1534 }
1535
1536 return OK;
1537 }
1538
1539
1540 /* Construct AUTH appendix string for MAIL TO */
1541 /*
1542 Arguments
1543 buffer to build string
1544 addrlist chain of potential addresses to deliver
1545 ob transport options
1546
1547 Globals f.smtp_authenticated
1548 client_authenticated_sender
1549 Return True on error, otherwise buffer has (possibly empty) terminated string
1550 */
1551
1552 BOOL
1553 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1554 smtp_transport_options_block *ob)
1555 {
1556 uschar *local_authenticated_sender = authenticated_sender;
1557
1558 #ifdef notdef
1559 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1560 #endif
1561
1562 if (ob->authenticated_sender != NULL)
1563 {
1564 uschar *new = expand_string(ob->authenticated_sender);
1565 if (new == NULL)
1566 {
1567 if (!f.expand_string_forcedfail)
1568 {
1569 uschar *message = string_sprintf("failed to expand "
1570 "authenticated_sender: %s", expand_string_message);
1571 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1572 return TRUE;
1573 }
1574 }
1575 else if (new[0] != 0) local_authenticated_sender = new;
1576 }
1577
1578 /* Add the authenticated sender address if present */
1579
1580 if ((f.smtp_authenticated || ob->authenticated_sender_force) &&
1581 local_authenticated_sender != NULL)
1582 {
1583 string_format(buffer, bufsize, " AUTH=%s",
1584 auth_xtextencode(local_authenticated_sender,
1585 Ustrlen(local_authenticated_sender)));
1586 client_authenticated_sender = string_copy(local_authenticated_sender);
1587 }
1588 else
1589 *buffer= 0;
1590
1591 return FALSE;
1592 }
1593
1594
1595
1596 #ifdef SUPPORT_DANE
1597 /* Lookup TLSA record for host/port.
1598 Return: OK success with dnssec; DANE mode
1599 DEFER Do not use this host now, may retry later
1600 FAIL_FORCED No TLSA record; DANE not usable
1601 FAIL Do not use this connection
1602 */
1603
1604 int
1605 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1606 {
1607 /* move this out to host.c given the similarity to dns_lookup() ? */
1608 uschar buffer[300];
1609 const uschar * fullname = buffer;
1610 int rc;
1611 BOOL sec;
1612
1613 /* TLSA lookup string */
1614 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1615
1616 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1617 sec = dns_is_secure(dnsa);
1618 DEBUG(D_transport)
1619 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1620
1621 switch (rc)
1622 {
1623 case DNS_AGAIN:
1624 return DEFER; /* just defer this TLS'd conn */
1625
1626 case DNS_SUCCEED:
1627 if (sec)
1628 {
1629 DEBUG(D_transport)
1630 {
1631 dns_scan dnss;
1632 for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1633 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1634 if (rr->type == T_TLSA && rr->size > 3)
1635 {
1636 uint16_t payload_length = rr->size - 3;
1637 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1638
1639 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1640 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1641 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1642 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1643 sp += sprintf(CS sp, "%02x", *p++);
1644
1645 debug_printf(" %s\n", s);
1646 }
1647 }
1648 return OK;
1649 }
1650 log_write(0, LOG_MAIN,
1651 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1652 /*FALLTRHOUGH*/
1653
1654 case DNS_NODATA: /* no TLSA RR for this lookup */
1655 case DNS_NOMATCH: /* no records at all for this lookup */
1656 return dane_required ? FAIL : FAIL_FORCED;
1657
1658 default:
1659 case DNS_FAIL:
1660 return dane_required ? FAIL : DEFER;
1661 }
1662 }
1663 #endif
1664
1665
1666
1667 typedef struct smtp_compare_s
1668 {
1669 uschar *current_sender_address;
1670 struct transport_instance *tblock;
1671 } smtp_compare_t;
1672
1673
1674 /* Create a unique string that identifies this message, it is based on
1675 sender_address, helo_data and tls_certificate if enabled.
1676 */
1677
1678 static uschar *
1679 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1680 {
1681 address_item * addr1;
1682 uschar * if1 = US"";
1683 uschar * helo1 = US"";
1684 #ifdef SUPPORT_TLS
1685 uschar * tlsc1 = US"";
1686 #endif
1687 uschar * save_sender_address = sender_address;
1688 uschar * local_identity = NULL;
1689 smtp_transport_options_block * ob = SOB tblock->options_block;
1690
1691 sender_address = sender;
1692
1693 addr1 = deliver_make_addr (sender, TRUE);
1694 deliver_set_expansions(addr1);
1695
1696 if (ob->interface)
1697 if1 = expand_string(ob->interface);
1698
1699 if (ob->helo_data)
1700 helo1 = expand_string(ob->helo_data);
1701
1702 #ifdef SUPPORT_TLS
1703 if (ob->tls_certificate)
1704 tlsc1 = expand_string(ob->tls_certificate);
1705 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1706 #else
1707 local_identity = string_sprintf ("%s^%s", if1, helo1);
1708 #endif
1709
1710 deliver_set_expansions(NULL);
1711 sender_address = save_sender_address;
1712
1713 return local_identity;
1714 }
1715
1716
1717
1718 /* This routine is a callback that is called from transport_check_waiting.
1719 This function will evaluate the incoming message versus the previous
1720 message. If the incoming message is using a different local identity then
1721 we will veto this new message. */
1722
1723 static BOOL
1724 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1725 {
1726 uschar * message_local_identity,
1727 * current_local_identity,
1728 * new_sender_address;
1729
1730 current_local_identity =
1731 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1732
1733 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1734 return 0;
1735
1736 message_local_identity =
1737 smtp_local_identity(new_sender_address, s_compare->tblock);
1738
1739 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1740 }
1741
1742
1743
1744 static unsigned
1745 ehlo_response(uschar * buf, unsigned checks)
1746 {
1747 size_t bsize = Ustrlen(buf);
1748
1749 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1750
1751 #ifdef SUPPORT_TLS
1752 # ifdef EXPERIMENTAL_REQUIRETLS
1753 if ( checks & OPTION_REQUIRETLS
1754 && pcre_exec(regex_REQUIRETLS, NULL, CS buf,bsize, 0, PCRE_EOPT, NULL,0) < 0)
1755 # endif
1756 checks &= ~OPTION_REQUIRETLS;
1757
1758 if ( checks & OPTION_TLS
1759 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1760 #endif
1761 checks &= ~OPTION_TLS;
1762
1763 if ( checks & OPTION_IGNQ
1764 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1765 PCRE_EOPT, NULL, 0) < 0)
1766 checks &= ~OPTION_IGNQ;
1767
1768 if ( checks & OPTION_CHUNKING
1769 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1770 checks &= ~OPTION_CHUNKING;
1771
1772 #ifndef DISABLE_PRDR
1773 if ( checks & OPTION_PRDR
1774 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1775 #endif
1776 checks &= ~OPTION_PRDR;
1777
1778 #ifdef SUPPORT_I18N
1779 if ( checks & OPTION_UTF8
1780 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1781 #endif
1782 checks &= ~OPTION_UTF8;
1783
1784 if ( checks & OPTION_DSN
1785 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1786 checks &= ~OPTION_DSN;
1787
1788 if ( checks & OPTION_PIPE
1789 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1790 PCRE_EOPT, NULL, 0) < 0)
1791 checks &= ~OPTION_PIPE;
1792
1793 if ( checks & OPTION_SIZE
1794 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1795 checks &= ~OPTION_SIZE;
1796
1797 #ifdef EXPERIMENTAL_PIPE_CONNECT
1798 if ( checks & OPTION_EARLY_PIPE
1799 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1800 PCRE_EOPT, NULL, 0) < 0)
1801 #endif
1802 checks &= ~OPTION_EARLY_PIPE;
1803
1804 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1805 return checks;
1806 }
1807
1808
1809
1810 /* Callback for emitting a BDAT data chunk header.
1811
1812 If given a nonzero size, first flush any buffered SMTP commands
1813 then emit the command.
1814
1815 Reap previous SMTP command responses if requested, and always reap
1816 the response from a previous BDAT command.
1817
1818 Args:
1819 tctx transport context
1820 chunk_size value for SMTP BDAT command
1821 flags
1822 tc_chunk_last add LAST option to SMTP BDAT command
1823 tc_reap_prev reap response to previous SMTP commands
1824
1825 Returns:
1826 OK or ERROR
1827 DEFER TLS error on first read (EHLO-resp); errno set
1828 */
1829
1830 static int
1831 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1832 unsigned flags)
1833 {
1834 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1835 smtp_context * sx = tctx->smtp_context;
1836 int cmd_count = 0;
1837 int prev_cmd_count;
1838
1839 /* Write SMTP chunk header command. If not reaping responses, note that
1840 there may be more writes (like, the chunk data) done soon. */
1841
1842 if (chunk_size > 0)
1843 {
1844 #ifdef EXPERIMENTAL_PIPE_CONNECT
1845 BOOL new_conn = !!(sx->outblock.conn_args);
1846 #endif
1847 if((cmd_count = smtp_write_command(sx,
1848 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1849 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1850 ) < 0) return ERROR;
1851 if (flags & tc_chunk_last)
1852 data_command = string_copy(big_buffer); /* Save for later error message */
1853 #ifdef EXPERIMENTAL_PIPE_CONNECT
1854 /* That command write could have been the one that made the connection.
1855 Copy the fd from the client conn ctx (smtp transport specific) to the
1856 generic transport ctx. */
1857
1858 if (new_conn)
1859 tctx->u.fd = sx->outblock.cctx->sock;
1860 #endif
1861 }
1862
1863 prev_cmd_count = cmd_count += sx->cmd_count;
1864
1865 /* Reap responses for any previous, but not one we just emitted */
1866
1867 if (chunk_size > 0)
1868 prev_cmd_count--;
1869 if (sx->pending_BDAT)
1870 prev_cmd_count--;
1871
1872 if (flags & tc_reap_prev && prev_cmd_count > 0)
1873 {
1874 DEBUG(D_transport) debug_printf("look for %d responses"
1875 " for previous pipelined cmds\n", prev_cmd_count);
1876
1877 switch(sync_responses(sx, prev_cmd_count, 0))
1878 {
1879 case 1: /* 2xx (only) => OK */
1880 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1881 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1882 case 0: break; /* No 2xx or 5xx, but no probs */
1883
1884 case -5: errno = ERRNO_TLSFAILURE;
1885 return DEFER;
1886 #ifdef EXPERIMENTAL_PIPE_CONNECT
1887 case -4: /* non-2xx for pipelined banner or EHLO */
1888 #endif
1889 case -1: /* Timeout on RCPT */
1890 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1891 }
1892 cmd_count = 1;
1893 if (!sx->pending_BDAT)
1894 pipelining_active = FALSE;
1895 }
1896
1897 /* Reap response for an outstanding BDAT */
1898
1899 if (sx->pending_BDAT)
1900 {
1901 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1902
1903 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1904 ob->command_timeout))
1905 {
1906 if (errno == 0 && sx->buffer[0] == '4')
1907 {
1908 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1909 sx->addrlist->more_errno |=
1910 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1911 }
1912 return ERROR;
1913 }
1914 cmd_count--;
1915 sx->pending_BDAT = FALSE;
1916 pipelining_active = FALSE;
1917 }
1918 else if (chunk_size > 0)
1919 sx->pending_BDAT = TRUE;
1920
1921
1922 sx->cmd_count = cmd_count;
1923 return OK;
1924 }
1925
1926
1927
1928
1929
1930 /*************************************************
1931 * Make connection for given message *
1932 *************************************************/
1933
1934 /*
1935 Arguments:
1936 ctx connection context
1937 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1938 a second attempt after TLS initialization fails
1939
1940 Returns: OK - the connection was made and the delivery attempted;
1941 fd is set in the conn context, tls_out set up.
1942 DEFER - the connection could not be made, or something failed
1943 while setting up the SMTP session, or there was a
1944 non-message-specific error, such as a timeout.
1945 ERROR - helo_data or add_headers or authenticated_sender is
1946 specified for this transport, and the string failed
1947 to expand
1948 */
1949 int
1950 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1951 {
1952 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1953 dns_answer tlsa_dnsa;
1954 #endif
1955 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1956 BOOL pass_message = FALSE;
1957 uschar * message = NULL;
1958 int yield = OK;
1959 int rc;
1960 #ifdef SUPPORT_TLS
1961 uschar * tls_errstr;
1962 #endif
1963
1964 sx->conn_args.ob = ob;
1965
1966 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1967 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1968 sx->ok = FALSE;
1969 sx->send_rset = TRUE;
1970 sx->send_quit = TRUE;
1971 sx->setting_up = TRUE;
1972 sx->esmtp = TRUE;
1973 sx->esmtp_sent = FALSE;
1974 #ifdef SUPPORT_I18N
1975 sx->utf8_needed = FALSE;
1976 #endif
1977 sx->dsn_all_lasthop = TRUE;
1978 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1979 sx->dane = FALSE;
1980 sx->dane_required =
1981 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1982 #endif
1983 #ifdef EXPERIMENTAL_PIPE_CONNECT
1984 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1985 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1986 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1987 #endif
1988
1989 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1990 sx->peer_offered = 0;
1991 sx->avoid_option = 0;
1992 sx->igquotstr = US"";
1993 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1994 #ifdef EXPERIMENTAL_DSN_INFO
1995 sx->smtp_greeting = NULL;
1996 sx->helo_response = NULL;
1997 #endif
1998
1999 smtp_command = US"initial connection";
2000 sx->buffer[0] = '\0';
2001
2002 /* Set up the buffer for reading SMTP response packets. */
2003
2004 sx->inblock.buffer = sx->inbuffer;
2005 sx->inblock.buffersize = sizeof(sx->inbuffer);
2006 sx->inblock.ptr = sx->inbuffer;
2007 sx->inblock.ptrend = sx->inbuffer;
2008
2009 /* Set up the buffer for holding SMTP commands while pipelining */
2010
2011 sx->outblock.buffer = sx->outbuffer;
2012 sx->outblock.buffersize = sizeof(sx->outbuffer);
2013 sx->outblock.ptr = sx->outbuffer;
2014 sx->outblock.cmd_count = 0;
2015 sx->outblock.authenticating = FALSE;
2016 sx->outblock.conn_args = NULL;
2017
2018 /* Reset the parameters of a TLS session. */
2019
2020 tls_out.bits = 0;
2021 tls_out.cipher = NULL; /* the one we may use for this transport */
2022 tls_out.ourcert = NULL;
2023 tls_out.peercert = NULL;
2024 tls_out.peerdn = NULL;
2025 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
2026 tls_out.sni = NULL;
2027 #endif
2028 tls_out.ocsp = OCSP_NOT_REQ;
2029
2030 /* Flip the legacy TLS-related variables over to the outbound set in case
2031 they're used in the context of the transport. Don't bother resetting
2032 afterward (when being used by a transport) as we're in a subprocess.
2033 For verify, unflipped once the callout is dealt with */
2034
2035 tls_modify_variables(&tls_out);
2036
2037 #ifndef SUPPORT_TLS
2038 if (sx->smtps)
2039 {
2040 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2041 DEFER, FALSE);
2042 return ERROR;
2043 }
2044 #endif
2045
2046 /* Make a connection to the host if this isn't a continued delivery, and handle
2047 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2048 specially so they can be identified for retries. */
2049
2050 if (!continue_hostname)
2051 {
2052 if (sx->verify)
2053 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2054
2055 /* Get the actual port the connection will use, into sx->conn_args.host */
2056
2057 smtp_port_for_connect(sx->conn_args.host, sx->port);
2058
2059 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
2060 /* Do TLSA lookup for DANE */
2061 {
2062 tls_out.dane_verified = FALSE;
2063 tls_out.tlsa_usage = 0;
2064
2065 if (sx->conn_args.host->dnssec == DS_YES)
2066 {
2067 if( sx->dane_required
2068 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2069 )
2070 switch (rc = tlsa_lookup(sx->conn_args.host, &tlsa_dnsa, sx->dane_required))
2071 {
2072 case OK: sx->dane = TRUE;
2073 ob->tls_tempfail_tryclear = FALSE;
2074 break;
2075 case FAIL_FORCED: break;
2076 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2077 string_sprintf("DANE error: tlsa lookup %s",
2078 rc_to_string(rc)),
2079 rc, FALSE);
2080 # ifndef DISABLE_EVENT
2081 (void) event_raise(sx->conn_args.tblock->event_action,
2082 US"dane:fail", sx->dane_required
2083 ? US"dane-required" : US"dnssec-invalid");
2084 # endif
2085 return rc;
2086 }
2087 }
2088 else if (sx->dane_required)
2089 {
2090 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2091 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2092 FAIL, FALSE);
2093 # ifndef DISABLE_EVENT
2094 (void) event_raise(sx->conn_args.tblock->event_action,
2095 US"dane:fail", US"dane-required");
2096 # endif
2097 return FAIL;
2098 }
2099 }
2100 #endif /*DANE*/
2101
2102 /* Make the TCP connection */
2103
2104 sx->cctx.tls_ctx = NULL;
2105 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2106 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2107
2108 #ifdef EXPERIMENTAL_PIPE_CONNECT
2109 if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK)
2110 {
2111 sx->early_pipe_ok = TRUE;
2112 if ( read_ehlo_cache_entry(sx)
2113 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2114 {
2115 DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2116 sx->early_pipe_active = TRUE;
2117 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2118 }
2119 }
2120
2121 if (sx->early_pipe_active)
2122 sx->outblock.conn_args = &sx->conn_args;
2123 else
2124 #endif
2125 {
2126 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2127 {
2128 uschar * msg = NULL;
2129 if (sx->verify)
2130 {
2131 msg = US strerror(errno);
2132 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
2133 }
2134 set_errno_nohost(sx->addrlist,
2135 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2136 sx->verify ? string_sprintf("could not connect: %s", msg)
2137 : NULL,
2138 DEFER, FALSE);
2139 sx->send_quit = FALSE;
2140 return DEFER;
2141 }
2142 }
2143 /* Expand the greeting message while waiting for the initial response. (Makes
2144 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2145 delayed till here so that $sending_interface and $sending_port are set. */
2146 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2147 will be? Somehow I doubt it. */
2148
2149 if (sx->helo_data)
2150 if (!(sx->helo_data = expand_string(sx->helo_data)))
2151 if (sx->verify)
2152 log_write(0, LOG_MAIN|LOG_PANIC,
2153 "<%s>: failed to expand transport's helo_data value for callout: %s",
2154 sx->addrlist->address, expand_string_message);
2155
2156 #ifdef SUPPORT_I18N
2157 if (sx->helo_data)
2158 {
2159 expand_string_message = NULL;
2160 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2161 &expand_string_message)),
2162 expand_string_message)
2163 if (sx->verify)
2164 log_write(0, LOG_MAIN|LOG_PANIC,
2165 "<%s>: failed to expand transport's helo_data value for callout: %s",
2166 sx->addrlist->address, expand_string_message);
2167 else
2168 sx->helo_data = NULL;
2169 }
2170 #endif
2171
2172 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2173 is nevertheless a reasonably clean way of programming this kind of logic,
2174 where you want to escape on any error. */
2175
2176 if (!sx->smtps)
2177 {
2178 #ifdef EXPERIMENTAL_PIPE_CONNECT
2179 if (sx->early_pipe_active)
2180 {
2181 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2182 sx->outblock.cmd_count = 1;
2183 }
2184 else
2185 #endif
2186 {
2187 #ifdef TCP_QUICKACK
2188 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2189 sizeof(off));
2190 #endif
2191 if (!smtp_reap_banner(sx))
2192 goto RESPONSE_FAILED;
2193 }
2194
2195 #ifndef DISABLE_EVENT
2196 {
2197 uschar * s;
2198 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2199 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2200 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2201 if (s)
2202 {
2203 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2204 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2205 DEFER, FALSE);
2206 yield = DEFER;
2207 goto SEND_QUIT;
2208 }
2209 }
2210 #endif
2211
2212 /* Now check if the helo_data expansion went well, and sign off cleanly if
2213 it didn't. */
2214
2215 if (!sx->helo_data)
2216 {
2217 message = string_sprintf("failed to expand helo_data: %s",
2218 expand_string_message);
2219 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2220 yield = DEFER;
2221 goto SEND_QUIT;
2222 }
2223 }
2224
2225 /** Debugging without sending a message
2226 sx->addrlist->transport_return = DEFER;
2227 goto SEND_QUIT;
2228 **/
2229
2230 /* Errors that occur after this point follow an SMTP command, which is
2231 left in big_buffer by smtp_write_command() for use in error messages. */
2232
2233 smtp_command = big_buffer;
2234
2235 /* Tell the remote who we are...
2236
2237 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2238 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2239 greeting is of this form. The assumption was that the far end supports it
2240 properly... but experience shows that there are some that give 5xx responses,
2241 even though the banner includes "ESMTP" (there's a bloody-minded one that
2242 says "ESMTP not spoken here"). Cope with that case.
2243
2244 September 2000: Time has passed, and it seems reasonable now to always send
2245 EHLO at the start. It is also convenient to make the change while installing
2246 the TLS stuff.
2247
2248 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2249 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2250 would be no way to send out the mails, so there is now a host list
2251 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2252 PIPELINING problem as well. Maybe it can also be useful to cure other
2253 problems with broken servers.
2254
2255 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2256 Then somebody tried it with a Microsoft mailer... It seems that all other
2257 mailers use upper case for some reason (the RFC is quite clear about case
2258 independence) so, for peace of mind, I gave in. */
2259
2260 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2261
2262 /* Alas; be careful, since this goto is not an error-out, so conceivably
2263 we might set data between here and the target which we assume to exist
2264 and be usable. I can see this coming back to bite us. */
2265 #ifdef SUPPORT_TLS
2266 if (sx->smtps)
2267 {
2268 smtp_peer_options |= OPTION_TLS;
2269 suppress_tls = FALSE;
2270 ob->tls_tempfail_tryclear = FALSE;
2271 smtp_command = US"SSL-on-connect";
2272 goto TLS_NEGOTIATE;
2273 }
2274 #endif
2275
2276 if (sx->esmtp)
2277 {
2278 if (smtp_write_command(sx,
2279 #ifdef EXPERIMENTAL_PIPE_CONNECT
2280 sx->early_pipe_active ? SCMD_BUFFER :
2281 #endif
2282 SCMD_FLUSH,
2283 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2284 goto SEND_FAILED;
2285 sx->esmtp_sent = TRUE;
2286
2287 #ifdef EXPERIMENTAL_PIPE_CONNECT
2288 if (sx->early_pipe_active)
2289 {
2290 sx->pending_EHLO = TRUE;
2291
2292 /* If we have too many authenticators to handle and might need to AUTH
2293 for this transport, pipeline no further as we will need the
2294 list of auth methods offered. Reap the banner and EHLO. */
2295
2296 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2297 && f.smtp_in_early_pipe_no_auth)
2298 {
2299 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2300 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2301 goto SEND_FAILED;
2302 if (sync_responses(sx, 2, 0) != 0)
2303 {
2304 HDEBUG(D_transport)
2305 debug_printf("failed reaping pipelined cmd responses\n");
2306 goto RESPONSE_FAILED;
2307 }
2308 sx->early_pipe_active = FALSE;
2309 }
2310 }
2311 else
2312 #endif
2313 if (!smtp_reap_ehlo(sx))
2314 goto RESPONSE_FAILED;
2315 }
2316 else
2317 DEBUG(D_transport)
2318 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2319
2320 #ifdef EXPERIMENTAL_PIPE_CONNECT
2321 if (!sx->early_pipe_active)
2322 #endif
2323 if (!sx->esmtp)
2324 {
2325 BOOL good_response;
2326 int n = sizeof(sx->buffer);
2327 uschar * rsp = sx->buffer;
2328
2329 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2330 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2331
2332 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2333 goto SEND_FAILED;
2334 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2335 #ifdef EXPERIMENTAL_DSN_INFO
2336 sx->helo_response = string_copy(rsp);
2337 #endif
2338 if (!good_response)
2339 {
2340 /* Handle special logging for a closed connection after HELO
2341 when had previously sent EHLO */
2342
2343 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2344 {
2345 errno = ERRNO_SMTPCLOSED;
2346 goto EHLOHELO_FAILED;
2347 }
2348 memmove(sx->buffer, rsp, Ustrlen(rsp));
2349 goto RESPONSE_FAILED;
2350 }
2351 }
2352
2353 if (sx->esmtp || sx->lmtp)
2354 {
2355 #ifdef EXPERIMENTAL_PIPE_CONNECT
2356 if (!sx->early_pipe_active)
2357 #endif
2358 {
2359 sx->peer_offered = ehlo_response(sx->buffer,
2360 OPTION_TLS /* others checked later */
2361 #ifdef EXPERIMENTAL_PIPE_CONNECT
2362 | (sx->early_pipe_ok
2363 ? OPTION_IGNQ
2364 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2365 #ifdef SUPPORT_I18N
2366 | OPTION_UTF8
2367 #endif
2368 | OPTION_EARLY_PIPE
2369 : 0
2370 )
2371 #endif
2372 );
2373 #ifdef EXPERIMENTAL_PIPE_CONNECT
2374 if (sx->early_pipe_ok)
2375 {
2376 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2377
2378 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2379 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2380 {
2381 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2382 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2383 write_ehlo_cache_entry(sx);
2384 }
2385 }
2386 #endif
2387 }
2388
2389 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2390
2391 #ifdef SUPPORT_TLS
2392 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2393 #endif
2394 }
2395 }
2396
2397 /* For continuing deliveries down the same channel, having re-exec'd the socket
2398 is the standard input; for a socket held open from verify it is recorded
2399 in the cutthrough context block. Either way we don't need to redo EHLO here
2400 (but may need to do so for TLS - see below).
2401 Set up the pointer to where subsequent commands will be left, for
2402 error messages. Note that smtp_peer_options will have been
2403 set from the command line if they were set in the process that passed the
2404 connection on. */
2405
2406 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2407 as the continue goes via transport_pass_socket() and doublefork and exec.
2408 It does not wait. Unclear how we keep separate host's responses
2409 separate - we could match up by host ip+port as a bodge. */
2410
2411 else
2412 {
2413 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2414 {
2415 sx->cctx = cutthrough.cctx;
2416 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2417 }
2418 else
2419 {
2420 sx->cctx.sock = 0; /* stdin */
2421 sx->cctx.tls_ctx = NULL;
2422 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2423 }
2424 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2425 smtp_command = big_buffer;
2426 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2427
2428 /* For a continued connection with TLS being proxied for us, or a
2429 held-open verify connection with TLS, nothing more to do. */
2430
2431 if ( continue_proxy_cipher
2432 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2433 && cutthrough.is_tls)
2434 )
2435 {
2436 sx->peer_offered = smtp_peer_options;
2437 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2438 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2439 continue_proxy_cipher ? "proxied" : "verify conn with");
2440 return OK;
2441 }
2442 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2443 }
2444
2445 /* If TLS is available on this connection, whether continued or not, attempt to
2446 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2447 send another EHLO - the server may give a different answer in secure mode. We
2448 use a separate buffer for reading the response to STARTTLS so that if it is
2449 negative, the original EHLO data is available for subsequent analysis, should
2450 the client not be required to use TLS. If the response is bad, copy the buffer
2451 for error analysis. */
2452
2453 #ifdef SUPPORT_TLS
2454 if ( smtp_peer_options & OPTION_TLS
2455 && !suppress_tls
2456 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2457 && ( !sx->verify
2458 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2459 ) )
2460 {
2461 uschar buffer2[4096];
2462
2463 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2464 goto SEND_FAILED;
2465
2466 #ifdef EXPERIMENTAL_PIPE_CONNECT
2467 /* If doing early-pipelining reap the banner and EHLO-response but leave
2468 the response for the STARTTLS we just sent alone. */
2469
2470 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2471 {
2472 HDEBUG(D_transport)
2473 debug_printf("failed reaping pipelined cmd responses\n");
2474 goto RESPONSE_FAILED;
2475 }
2476 #endif
2477
2478 /* If there is an I/O error, transmission of this message is deferred. If
2479 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2480 false, we also defer. However, if there is a temporary rejection of STARTTLS
2481 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2482 STARTTLS, we carry on. This means we will try to send the message in clear,
2483 unless the host is in hosts_require_tls (tested below). */
2484
2485 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2486 {
2487 if ( errno != 0
2488 || buffer2[0] == 0
2489 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2490 )
2491 {
2492 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2493 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2494 goto RESPONSE_FAILED;
2495 }
2496 }
2497
2498 /* STARTTLS accepted: try to negotiate a TLS session. */
2499
2500 else
2501 TLS_NEGOTIATE:
2502 {
2503 sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->conn_args.host,
2504 sx->addrlist, sx->conn_args.tblock,
2505 # ifdef SUPPORT_DANE
2506 sx->dane ? &tlsa_dnsa : NULL,
2507 # endif
2508 &tls_out, &tls_errstr);
2509
2510 if (!sx->cctx.tls_ctx)
2511 {
2512 /* TLS negotiation failed; give an error. From outside, this function may
2513 be called again to try in clear on a new connection, if the options permit
2514 it for this host. */
2515 GNUTLS_CONN_FAILED:
2516 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2517
2518 # ifdef SUPPORT_DANE
2519 if (sx->dane)
2520 {
2521 log_write(0, LOG_MAIN,
2522 "DANE attempt failed; TLS connection to %s [%s]: %s",
2523 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2524 # ifndef DISABLE_EVENT
2525 (void) event_raise(sx->conn_args.tblock->event_action,
2526 US"dane:fail", US"validation-failure"); /* could do with better detail */
2527 # endif
2528 }
2529 # endif
2530
2531 errno = ERRNO_TLSFAILURE;
2532 message = string_sprintf("TLS session: %s", tls_errstr);
2533 sx->send_quit = FALSE;
2534 goto TLS_FAILED;
2535 }
2536
2537 /* TLS session is set up */
2538
2539 smtp_peer_options_wrap = smtp_peer_options;
2540 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2541 if (addr->transport_return == PENDING_DEFER)
2542 {
2543 addr->cipher = tls_out.cipher;
2544 addr->ourcert = tls_out.ourcert;
2545 addr->peercert = tls_out.peercert;
2546 addr->peerdn = tls_out.peerdn;
2547 addr->ocsp = tls_out.ocsp;
2548 }
2549 }
2550 }
2551
2552 /* if smtps, we'll have smtp_command set to something else; always safe to
2553 reset it here. */
2554 smtp_command = big_buffer;
2555
2556 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2557 helo_data is null, we are dealing with a connection that was passed from
2558 another process, and so we won't have expanded helo_data above. We have to
2559 expand it here. $sending_ip_address and $sending_port are set up right at the
2560 start of the Exim process (in exim.c). */
2561
2562 if (tls_out.active.sock >= 0)
2563 {
2564 uschar * greeting_cmd;
2565
2566 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2567 {
2568 uschar *message = string_sprintf("failed to expand helo_data: %s",
2569 expand_string_message);
2570 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2571 yield = DEFER;
2572 goto SEND_QUIT;
2573 }
2574
2575 #ifdef EXPERIMENTAL_PIPE_CONNECT
2576 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2577 We're unlikely to get the group sent and delivered before the server sends its
2578 banner, but it's still worth sending as a group.
2579 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2580 the reverse. */
2581
2582 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2583 {
2584 sx->peer_offered = sx->ehlo_resp.crypted_features;
2585 if ((sx->early_pipe_active =
2586 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2587 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2588 }
2589 #endif
2590
2591 /* For SMTPS we need to wait for the initial OK response. */
2592 if (sx->smtps)
2593 #ifdef EXPERIMENTAL_PIPE_CONNECT
2594 if (sx->early_pipe_active)
2595 {
2596 sx->pending_BANNER = TRUE;
2597 sx->outblock.cmd_count = 1;
2598 }
2599 else
2600 #endif
2601 if (!smtp_reap_banner(sx))
2602 goto RESPONSE_FAILED;
2603
2604 if (sx->lmtp)
2605 greeting_cmd = US"LHLO";
2606 else if (sx->esmtp)
2607 greeting_cmd = US"EHLO";
2608 else
2609 {
2610 greeting_cmd = US"HELO";
2611 DEBUG(D_transport)
2612 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2613 }
2614
2615 if (smtp_write_command(sx,
2616 #ifdef EXPERIMENTAL_PIPE_CONNECT
2617 sx->early_pipe_active ? SCMD_BUFFER :
2618 #endif
2619 SCMD_FLUSH,
2620 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2621 goto SEND_FAILED;
2622
2623 #ifdef EXPERIMENTAL_PIPE_CONNECT
2624 if (sx->early_pipe_active)
2625 sx->pending_EHLO = TRUE;
2626 else
2627 #endif
2628 {
2629 if (!smtp_reap_ehlo(sx))
2630 #ifdef USE_GNUTLS
2631 {
2632 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2633 cert late, under TLS1.3 - which means here; the first time we try to
2634 receive crypted data. Treat it as if it was a connect-time failure.
2635 See also the early-pipe equivalent... which will be hard; every call
2636 to sync_responses will need to check the result.
2637 It would be nicer to have GnuTLS check the cert during the handshake.
2638 Can it do that, with all the flexibility we need? */
2639
2640 tls_errstr = US"error on first read";
2641 goto GNUTLS_CONN_FAILED;
2642 }
2643 #else
2644 goto RESPONSE_FAILED;
2645 #endif
2646 smtp_peer_options = 0;
2647 }
2648 }
2649
2650 /* If the host is required to use a secure channel, ensure that we
2651 have one. */
2652
2653 else if ( sx->smtps
2654 # ifdef SUPPORT_DANE
2655 || sx->dane
2656 # endif
2657 # ifdef EXPERIMENTAL_REQUIRETLS
2658 || tls_requiretls & REQUIRETLS_MSG
2659 # endif
2660 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2661 )
2662 {
2663 errno =
2664 # ifdef EXPERIMENTAL_REQUIRETLS
2665 tls_requiretls & REQUIRETLS_MSG ? ERRNO_REQUIRETLS :
2666 # endif
2667 ERRNO_TLSREQUIRED;
2668 message = string_sprintf("a TLS session is required, but %s",
2669 smtp_peer_options & OPTION_TLS
2670 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2671 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2672 if (sx->dane)
2673 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2674 smtp_peer_options & OPTION_TLS
2675 ? US"validation-failure" /* could do with better detail */
2676 : US"starttls-not-supported");
2677 # endif
2678 goto TLS_FAILED;
2679 }
2680 #endif /*SUPPORT_TLS*/
2681
2682 /* If TLS is active, we have just started it up and re-done the EHLO command,
2683 so its response needs to be analyzed. If TLS is not active and this is a
2684 continued session down a previously-used socket, we haven't just done EHLO, so
2685 we skip this. */
2686
2687 if (continue_hostname == NULL
2688 #ifdef SUPPORT_TLS
2689 || tls_out.active.sock >= 0
2690 #endif
2691 )
2692 {
2693 if (sx->esmtp || sx->lmtp)
2694 {
2695 #ifdef EXPERIMENTAL_PIPE_CONNECT
2696 if (!sx->early_pipe_active)
2697 #endif
2698 {
2699 sx->peer_offered = ehlo_response(sx->buffer,
2700 0 /* no TLS */
2701 #ifdef EXPERIMENTAL_PIPE_CONNECT
2702 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2703 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2704 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8 | OPTION_REQUIRETLS
2705 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2706
2707 #else
2708
2709 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2710 | OPTION_CHUNKING
2711 | OPTION_PRDR
2712 # ifdef SUPPORT_I18N
2713 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2714 /*XXX if we hand peercaps on to continued-conn processes,
2715 must not depend on this addr */
2716 # endif
2717 | OPTION_DSN
2718 | OPTION_PIPE
2719 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2720 # if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2721 | (tls_requiretls & REQUIRETLS_MSG ? OPTION_REQUIRETLS : 0)
2722 # endif
2723 #endif
2724 );
2725 #ifdef EXPERIMENTAL_PIPE_CONNECT
2726 if (tls_out.active.sock >= 0)
2727 sx->ehlo_resp.crypted_features = sx->peer_offered;
2728 #endif
2729 }
2730
2731 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2732 lmtp_ignore_quota option was set. */
2733
2734 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2735
2736 /* If the response to EHLO specified support for the SIZE parameter, note
2737 this, provided size_addition is non-negative. */
2738
2739 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2740
2741 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2742 the current host, esmtp will be false, so PIPELINING can never be used. If
2743 the current host matches hosts_avoid_pipelining, don't do it. */
2744
2745 if ( sx->peer_offered & OPTION_PIPE
2746 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2747 smtp_peer_options |= OPTION_PIPE;
2748
2749 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2750 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2751
2752 if ( sx->peer_offered & OPTION_CHUNKING
2753 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2754 sx->peer_offered &= ~OPTION_CHUNKING;
2755
2756 if (sx->peer_offered & OPTION_CHUNKING)
2757 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2758
2759 #ifndef DISABLE_PRDR
2760 if ( sx->peer_offered & OPTION_PRDR
2761 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2762 sx->peer_offered &= ~OPTION_PRDR;
2763
2764 if (sx->peer_offered & OPTION_PRDR)
2765 DEBUG(D_transport) debug_printf("PRDR usable\n");
2766 #endif
2767
2768 /* Note if the server supports DSN */
2769 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2770 DEBUG(D_transport) debug_printf("%susing DSN\n",
2771 sx->peer_offered & OPTION_DSN ? "" : "not ");
2772
2773 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2774 if (sx->peer_offered & OPTION_REQUIRETLS)
2775 {
2776 smtp_peer_options |= OPTION_REQUIRETLS;
2777 DEBUG(D_transport) debug_printf(
2778 tls_requiretls & REQUIRETLS_MSG
2779 ? "using REQUIRETLS\n" : "REQUIRETLS offered\n");
2780 }
2781 #endif
2782
2783 #ifdef EXPERIMENTAL_PIPE_CONNECT
2784 if ( sx->early_pipe_ok
2785 && !sx->early_pipe_active
2786 && tls_out.active.sock >= 0
2787 && smtp_peer_options & OPTION_PIPE
2788 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2789 & OPTION_EARLY_PIPE)
2790 {
2791 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2792 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2793 write_ehlo_cache_entry(sx);
2794 }
2795 #endif
2796
2797 /* Note if the response to EHLO specifies support for the AUTH extension.
2798 If it has, check that this host is one we want to authenticate to, and do
2799 the business. The host name and address must be available when the
2800 authenticator's client driver is running. */
2801
2802 switch (yield = smtp_auth(sx))
2803 {
2804 default: goto SEND_QUIT;
2805 case OK: break;
2806 case FAIL_SEND: goto SEND_FAILED;
2807 case FAIL: goto RESPONSE_FAILED;
2808 }
2809 }
2810 }
2811 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2812
2813 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2814 message-specific. */
2815
2816 sx->setting_up = FALSE;
2817
2818 #ifdef SUPPORT_I18N
2819 if (sx->addrlist->prop.utf8_msg)
2820 {
2821 uschar * s;
2822
2823 /* If the transport sets a downconversion mode it overrides any set by ACL
2824 for the message. */
2825
2826 if ((s = ob->utf8_downconvert))
2827 {
2828 if (!(s = expand_string(s)))
2829 {
2830 message = string_sprintf("failed to expand utf8_downconvert: %s",
2831 expand_string_message);
2832 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2833 yield = DEFER;
2834 goto SEND_QUIT;
2835 }
2836 switch (*s)
2837 {
2838 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2839 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2840 break;
2841 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2842 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2843 break;
2844 case '-': if (s[1] == '1')
2845 {
2846 sx->addrlist->prop.utf8_downcvt = FALSE;
2847 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2848 }
2849 break;
2850 }
2851 }
2852
2853 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2854 && !sx->addrlist->prop.utf8_downcvt_maybe;
2855 DEBUG(D_transport) if (!sx->utf8_needed)
2856 debug_printf("utf8: %s downconvert\n",
2857 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2858 }
2859
2860 /* If this is an international message we need the host to speak SMTPUTF8 */
2861 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2862 {
2863 errno = ERRNO_UTF8_FWD;
2864 goto RESPONSE_FAILED;
2865 }
2866 #endif /*SUPPORT_I18N*/
2867
2868 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2869 /*XXX should tls_requiretls actually be per-addr? */
2870
2871 if ( tls_requiretls & REQUIRETLS_MSG
2872 && !(sx->peer_offered & OPTION_REQUIRETLS)
2873 )
2874 {
2875 sx->setting_up = TRUE;
2876 errno = ERRNO_REQUIRETLS;
2877 message = US"REQUIRETLS support is required from the server"
2878 " but it was not offered";
2879 DEBUG(D_transport) debug_printf("%s\n", message);
2880 goto TLS_FAILED;
2881 }
2882 #endif
2883
2884 return OK;
2885
2886
2887 {
2888 int code;
2889
2890 RESPONSE_FAILED:
2891 message = NULL;
2892 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2893 sx->buffer, &code, &message, &pass_message);
2894 yield = DEFER;
2895 goto FAILED;
2896
2897 SEND_FAILED:
2898 code = '4';
2899 message = US string_sprintf("send() to %s [%s] failed: %s",
2900 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2901 sx->send_quit = FALSE;
2902 yield = DEFER;
2903 goto FAILED;
2904
2905 EHLOHELO_FAILED:
2906 code = '4';
2907 message = string_sprintf("Remote host closed connection in response to %s"
2908 " (EHLO response was: %s)", smtp_command, sx->buffer);
2909 sx->send_quit = FALSE;
2910 yield = DEFER;
2911 goto FAILED;
2912
2913 /* This label is jumped to directly when a TLS negotiation has failed,
2914 or was not done for a host for which it is required. Values will be set
2915 in message and errno, and setting_up will always be true. Treat as
2916 a temporary error. */
2917
2918 #ifdef SUPPORT_TLS
2919 TLS_FAILED:
2920 # ifdef EXPERIMENTAL_REQUIRETLS
2921 if (errno == ERRNO_REQUIRETLS)
2922 code = '5', yield = FAIL;
2923 /*XXX DSN will be labelled 500; prefer 530 5.7.4 */
2924 else
2925 # endif
2926 code = '4', yield = DEFER;
2927 goto FAILED;
2928 #endif
2929
2930 /* The failure happened while setting up the call; see if the failure was
2931 a 5xx response (this will either be on connection, or following HELO - a 5xx
2932 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2933 fail all addresses, as this host is never going to accept them. For other
2934 errors during setting up (timeouts or whatever), defer all addresses, and
2935 yield DEFER, so that the host is not tried again for a while.
2936
2937 XXX This peeking for another host feels like a layering violation. We want
2938 to note the host as unusable, but down here we shouldn't know if this was
2939 the last host to try for the addr(list). Perhaps the upper layer should be
2940 the one to do set_errno() ? The problem is that currently the addr is where
2941 errno etc. are stashed, but until we run out of hosts to try the errors are
2942 host-specific. Maybe we should enhance the host_item definition? */
2943
2944 FAILED:
2945 sx->ok = FALSE; /* For when reached by GOTO */
2946 set_errno(sx->addrlist, errno, message,
2947 sx->conn_args.host->next
2948 ? DEFER
2949 : code == '5'
2950 #ifdef SUPPORT_I18N
2951 || errno == ERRNO_UTF8_FWD
2952 #endif
2953 ? FAIL : DEFER,
2954 pass_message, sx->conn_args.host
2955 #ifdef EXPERIMENTAL_DSN_INFO
2956 , sx->smtp_greeting, sx->helo_response
2957 #endif
2958 );
2959 }
2960
2961
2962 SEND_QUIT:
2963
2964 if (sx->send_quit)
2965 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2966
2967 #ifdef SUPPORT_TLS
2968 if (sx->cctx.tls_ctx)
2969 {
2970 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2971 sx->cctx.tls_ctx = NULL;
2972 }
2973 #endif
2974
2975 /* Close the socket, and return the appropriate value, first setting
2976 works because the NULL setting is passed back to the calling process, and
2977 remote_max_parallel is forced to 1 when delivering over an existing connection,
2978 */
2979
2980 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2981 if (sx->send_quit)
2982 {
2983 shutdown(sx->cctx.sock, SHUT_WR);
2984 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2985 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2986 i--; /* drain socket */
2987 sx->send_quit = FALSE;
2988 }
2989 (void)close(sx->cctx.sock);
2990 sx->cctx.sock = -1;
2991
2992 #ifndef DISABLE_EVENT
2993 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2994 #endif
2995
2996 continue_transport = NULL;
2997 continue_hostname = NULL;
2998 return yield;
2999 }
3000
3001
3002
3003
3004 /* Create the string of options that will be appended to the MAIL FROM:
3005 in the connection context buffer */
3006
3007 static int
3008 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3009 {
3010 uschar * p = sx->buffer;
3011 address_item * addr;
3012 int address_count;
3013
3014 *p = 0;
3015
3016 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3017 send it, adding something to the message size to allow for imprecision
3018 and things that get added en route. Exim keeps the number of lines
3019 in a message, so we can give an accurate value for the original message, but we
3020 need some additional to handle added headers. (Double "." characters don't get
3021 included in the count.) */
3022
3023 if ( message_size > 0
3024 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3025 {
3026 /*XXX problem here under spool_files_wireformat?
3027 Or just forget about lines? Or inflate by a fixed proportion? */
3028
3029 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3030 while (*p) p++;
3031 }
3032
3033 #ifndef DISABLE_PRDR
3034 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3035 request that */
3036
3037 sx->prdr_active = FALSE;
3038 if (sx->peer_offered & OPTION_PRDR)
3039 for (address_item * addr = addrlist; addr; addr = addr->next)
3040 if (addr->transport_return == PENDING_DEFER)
3041 {
3042 for (addr = addr->next; addr; addr = addr->next)
3043 if (addr->transport_return == PENDING_DEFER)
3044 { /* at least two recipients to send */
3045 sx->prdr_active = TRUE;
3046 sprintf(CS p, " PRDR"); p += 5;
3047 break;
3048 }
3049 break;
3050 }
3051 #endif
3052
3053 #ifdef SUPPORT_I18N
3054 /* If it supports internationalised messages, and this meesage need that,
3055 request it */
3056
3057 if ( sx->peer_offered & OPTION_UTF8
3058 && addrlist->prop.utf8_msg
3059 && !addrlist->prop.utf8_downcvt
3060 )
3061 Ustrcpy(p, " SMTPUTF8"), p += 9;
3062 #endif
3063
3064 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
3065 if (tls_requiretls & REQUIRETLS_MSG)
3066 Ustrcpy(p, " REQUIRETLS") , p += 11;
3067 #endif
3068
3069 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3070 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3071 addr && address_count < sx->max_rcpt;
3072 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3073 {
3074 address_count++;
3075 if (!(addr->dsn_flags & rf_dsnlasthop))
3076 {
3077 sx->dsn_all_lasthop = FALSE;
3078 break;
3079 }
3080 }
3081
3082 /* Add any DSN flags to the mail command */
3083
3084 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3085 {
3086 if (dsn_ret == dsn_ret_hdrs)
3087 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3088 else if (dsn_ret == dsn_ret_full)
3089 { Ustrcpy(p, " RET=FULL"); p += 9; }
3090
3091 if (dsn_envid)
3092 {
3093 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3094 while (*p) p++;
3095 }
3096 }
3097
3098 /* If an authenticated_sender override has been specified for this transport
3099 instance, expand it. If the expansion is forced to fail, and there was already
3100 an authenticated_sender for this message, the original value will be used.
3101 Other expansion failures are serious. An empty result is ignored, but there is
3102 otherwise no check - this feature is expected to be used with LMTP and other
3103 cases where non-standard addresses (e.g. without domains) might be required. */
3104
3105 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3106 return ERROR;
3107
3108 return OK;
3109 }
3110
3111
3112 static void
3113 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3114 {
3115 uschar * p = sx->buffer;
3116 *p = 0;
3117
3118 /* Add any DSN flags to the rcpt command */
3119
3120 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3121 {
3122 if (addr->dsn_flags & rf_dsnflags)
3123 {
3124 BOOL first = TRUE;
3125
3126 Ustrcpy(p, " NOTIFY=");
3127 while (*p) p++;
3128 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3129 {
3130 if (!first) *p++ = ',';
3131 first = FALSE;
3132 Ustrcpy(p, rf_names[i]);
3133 while (*p) p++;
3134 }
3135 }
3136
3137 if (addr->dsn_orcpt)
3138 {
3139 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3140 addr->dsn_orcpt);
3141 while (*p) p++;
3142 }
3143 }
3144 }
3145
3146
3147
3148 /*
3149 Return:
3150 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3151 -1 MAIL response error
3152 -2 any non-MAIL read i/o error
3153 -3 non-MAIL response timeout
3154 -4 internal error; channel still usable
3155 -5 transmit failed
3156 */
3157
3158 int
3159 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3160 {
3161 address_item * addr;
3162 int address_count;
3163 int rc;
3164
3165 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3166 {
3167 *yield = ERROR;
3168 return -4;
3169 }
3170
3171 /* From here until we send the DATA command, we can make use of PIPELINING
3172 if the server host supports it. The code has to be able to check the responses
3173 at any point, for when the buffer fills up, so we write it totally generally.
3174 When PIPELINING is off, each command written reports that it has flushed the
3175 buffer. */
3176
3177 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3178
3179 {
3180 uschar * s = sx->from_addr;
3181 #ifdef SUPPORT_I18N
3182 uschar * errstr = NULL;
3183
3184 /* If we must downconvert, do the from-address here. Remember we had to
3185 for the to-addresses (done below), and also (ugly) for re-doing when building
3186 the delivery log line. */
3187
3188 if ( sx->addrlist->prop.utf8_msg
3189 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3190 )
3191 {
3192 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3193 {
3194 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3195 *yield = ERROR;
3196 return -4;
3197 }
3198 setflag(sx->addrlist, af_utf8_downcvt);
3199 }
3200 #endif
3201
3202 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3203 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3204 }
3205
3206 mail_command = string_copy(big_buffer); /* Save for later error message */
3207
3208 switch(rc)
3209 {
3210 case -1: /* Transmission error */
3211 return -5;
3212
3213 case +1: /* Cmd was sent */
3214 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3215 (SOB sx->conn_args.ob)->command_timeout))
3216 {
3217 if (errno == 0 && sx->buffer[0] == '4')
3218 {
3219 errno = ERRNO_MAIL4XX;
3220 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3221 }
3222 return -1;
3223 }
3224 sx->pending_MAIL = FALSE;
3225 break;
3226
3227 /* otherwise zero: command queued for pipeline */
3228 }
3229
3230 /* Pass over all the relevant recipient addresses for this host, which are the
3231 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3232 several before we have to read the responses for those seen so far. This
3233 checking is done by a subroutine because it also needs to be done at the end.
3234 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3235 the next one if not all are sent.
3236
3237 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3238 last address because we want to abort if any recipients have any kind of
3239 problem, temporary or permanent. We know that all recipient addresses will have
3240 the PENDING_DEFER status, because only one attempt is ever made, and we know
3241 that max_rcpt will be large, so all addresses will be done at once.
3242
3243 For verify we flush the pipeline after any (the only) rcpt address. */
3244
3245 for (addr = sx->first_addr, address_count = 0;
3246 addr && address_count < sx->max_rcpt;
3247 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3248 {
3249 int count;
3250 BOOL no_flush;
3251 uschar * rcpt_addr;
3252
3253 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3254 ? dsn_support_yes : dsn_support_no;
3255
3256 address_count++;
3257 no_flush = pipelining_active && !sx->verify
3258 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3259
3260 build_rcptcmd_options(sx, addr);
3261
3262 /* Now send the RCPT command, and process outstanding responses when
3263 necessary. After a timeout on RCPT, we just end the function, leaving the
3264 yield as OK, because this error can often mean that there is a problem with
3265 just one address, so we don't want to delay the host. */
3266
3267 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3268
3269 #ifdef SUPPORT_I18N
3270 if ( testflag(sx->addrlist, af_utf8_downcvt)
3271 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3272 )
3273 {
3274 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3275 errno = ERRNO_EXPANDFAIL;
3276 return -5; /*XXX too harsh? */
3277 }
3278 #endif
3279
3280 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3281 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3282
3283 if (count < 0) return -5;
3284 if (count > 0)