TLS: refactor client-start interface
[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 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1953 BOOL pass_message = FALSE;
1954 uschar * message = NULL;
1955 int yield = OK;
1956 int rc;
1957 #ifdef SUPPORT_TLS
1958 uschar * tls_errstr;
1959 #endif
1960
1961 sx->conn_args.ob = ob;
1962
1963 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1964 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1965 sx->ok = FALSE;
1966 sx->send_rset = TRUE;
1967 sx->send_quit = TRUE;
1968 sx->setting_up = TRUE;
1969 sx->esmtp = TRUE;
1970 sx->esmtp_sent = FALSE;
1971 #ifdef SUPPORT_I18N
1972 sx->utf8_needed = FALSE;
1973 #endif
1974 sx->dsn_all_lasthop = TRUE;
1975 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1976 sx->conn_args.dane = FALSE;
1977 sx->dane_required =
1978 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1979 #endif
1980 #ifdef EXPERIMENTAL_PIPE_CONNECT
1981 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1982 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1983 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1984 #endif
1985
1986 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1987 sx->peer_offered = 0;
1988 sx->avoid_option = 0;
1989 sx->igquotstr = US"";
1990 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1991 #ifdef EXPERIMENTAL_DSN_INFO
1992 sx->smtp_greeting = NULL;
1993 sx->helo_response = NULL;
1994 #endif
1995
1996 smtp_command = US"initial connection";
1997 sx->buffer[0] = '\0';
1998
1999 /* Set up the buffer for reading SMTP response packets. */
2000
2001 sx->inblock.buffer = sx->inbuffer;
2002 sx->inblock.buffersize = sizeof(sx->inbuffer);
2003 sx->inblock.ptr = sx->inbuffer;
2004 sx->inblock.ptrend = sx->inbuffer;
2005
2006 /* Set up the buffer for holding SMTP commands while pipelining */
2007
2008 sx->outblock.buffer = sx->outbuffer;
2009 sx->outblock.buffersize = sizeof(sx->outbuffer);
2010 sx->outblock.ptr = sx->outbuffer;
2011 sx->outblock.cmd_count = 0;
2012 sx->outblock.authenticating = FALSE;
2013 sx->outblock.conn_args = NULL;
2014
2015 /* Reset the parameters of a TLS session. */
2016
2017 tls_out.bits = 0;
2018 tls_out.cipher = NULL; /* the one we may use for this transport */
2019 tls_out.ourcert = NULL;
2020 tls_out.peercert = NULL;
2021 tls_out.peerdn = NULL;
2022 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
2023 tls_out.sni = NULL;
2024 #endif
2025 tls_out.ocsp = OCSP_NOT_REQ;
2026
2027 /* Flip the legacy TLS-related variables over to the outbound set in case
2028 they're used in the context of the transport. Don't bother resetting
2029 afterward (when being used by a transport) as we're in a subprocess.
2030 For verify, unflipped once the callout is dealt with */
2031
2032 tls_modify_variables(&tls_out);
2033
2034 #ifndef SUPPORT_TLS
2035 if (sx->smtps)
2036 {
2037 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2038 DEFER, FALSE);
2039 return ERROR;
2040 }
2041 #endif
2042
2043 /* Make a connection to the host if this isn't a continued delivery, and handle
2044 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2045 specially so they can be identified for retries. */
2046
2047 if (!continue_hostname)
2048 {
2049 if (sx->verify)
2050 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2051
2052 /* Get the actual port the connection will use, into sx->conn_args.host */
2053
2054 smtp_port_for_connect(sx->conn_args.host, sx->port);
2055
2056 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
2057 /* Do TLSA lookup for DANE */
2058 {
2059 tls_out.dane_verified = FALSE;
2060 tls_out.tlsa_usage = 0;
2061
2062 if (sx->conn_args.host->dnssec == DS_YES)
2063 {
2064 if( sx->dane_required
2065 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2066 )
2067 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2068 {
2069 case OK: sx->conn_args.dane = TRUE;
2070 ob->tls_tempfail_tryclear = FALSE;
2071 break;
2072 case FAIL_FORCED: break;
2073 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2074 string_sprintf("DANE error: tlsa lookup %s",
2075 rc_to_string(rc)),
2076 rc, FALSE);
2077 # ifndef DISABLE_EVENT
2078 (void) event_raise(sx->conn_args.tblock->event_action,
2079 US"dane:fail", sx->dane_required
2080 ? US"dane-required" : US"dnssec-invalid");
2081 # endif
2082 return rc;
2083 }
2084 }
2085 else if (sx->dane_required)
2086 {
2087 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2088 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2089 FAIL, FALSE);
2090 # ifndef DISABLE_EVENT
2091 (void) event_raise(sx->conn_args.tblock->event_action,
2092 US"dane:fail", US"dane-required");
2093 # endif
2094 return FAIL;
2095 }
2096 }
2097 #endif /*DANE*/
2098
2099 /* Make the TCP connection */
2100
2101 sx->cctx.tls_ctx = NULL;
2102 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2103 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2104
2105 #ifdef EXPERIMENTAL_PIPE_CONNECT
2106 if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK)
2107 {
2108 sx->early_pipe_ok = TRUE;
2109 if ( read_ehlo_cache_entry(sx)
2110 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2111 {
2112 DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2113 sx->early_pipe_active = TRUE;
2114 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2115 }
2116 }
2117
2118 if (sx->early_pipe_active)
2119 sx->outblock.conn_args = &sx->conn_args;
2120 else
2121 #endif
2122 {
2123 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2124 {
2125 uschar * msg = NULL;
2126 if (sx->verify)
2127 {
2128 msg = US strerror(errno);
2129 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
2130 }
2131 set_errno_nohost(sx->addrlist,
2132 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2133 sx->verify ? string_sprintf("could not connect: %s", msg)
2134 : NULL,
2135 DEFER, FALSE);
2136 sx->send_quit = FALSE;
2137 return DEFER;
2138 }
2139 }
2140 /* Expand the greeting message while waiting for the initial response. (Makes
2141 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2142 delayed till here so that $sending_interface and $sending_port are set. */
2143 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2144 will be? Somehow I doubt it. */
2145
2146 if (sx->helo_data)
2147 if (!(sx->helo_data = expand_string(sx->helo_data)))
2148 if (sx->verify)
2149 log_write(0, LOG_MAIN|LOG_PANIC,
2150 "<%s>: failed to expand transport's helo_data value for callout: %s",
2151 sx->addrlist->address, expand_string_message);
2152
2153 #ifdef SUPPORT_I18N
2154 if (sx->helo_data)
2155 {
2156 expand_string_message = NULL;
2157 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2158 &expand_string_message)),
2159 expand_string_message)
2160 if (sx->verify)
2161 log_write(0, LOG_MAIN|LOG_PANIC,
2162 "<%s>: failed to expand transport's helo_data value for callout: %s",
2163 sx->addrlist->address, expand_string_message);
2164 else
2165 sx->helo_data = NULL;
2166 }
2167 #endif
2168
2169 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2170 is nevertheless a reasonably clean way of programming this kind of logic,
2171 where you want to escape on any error. */
2172
2173 if (!sx->smtps)
2174 {
2175 #ifdef EXPERIMENTAL_PIPE_CONNECT
2176 if (sx->early_pipe_active)
2177 {
2178 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2179 sx->outblock.cmd_count = 1;
2180 }
2181 else
2182 #endif
2183 {
2184 #ifdef TCP_QUICKACK
2185 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2186 sizeof(off));
2187 #endif
2188 if (!smtp_reap_banner(sx))
2189 goto RESPONSE_FAILED;
2190 }
2191
2192 #ifndef DISABLE_EVENT
2193 {
2194 uschar * s;
2195 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2196 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2197 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2198 if (s)
2199 {
2200 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2201 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2202 DEFER, FALSE);
2203 yield = DEFER;
2204 goto SEND_QUIT;
2205 }
2206 }
2207 #endif
2208
2209 /* Now check if the helo_data expansion went well, and sign off cleanly if
2210 it didn't. */
2211
2212 if (!sx->helo_data)
2213 {
2214 message = string_sprintf("failed to expand helo_data: %s",
2215 expand_string_message);
2216 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2217 yield = DEFER;
2218 goto SEND_QUIT;
2219 }
2220 }
2221
2222 /** Debugging without sending a message
2223 sx->addrlist->transport_return = DEFER;
2224 goto SEND_QUIT;
2225 **/
2226
2227 /* Errors that occur after this point follow an SMTP command, which is
2228 left in big_buffer by smtp_write_command() for use in error messages. */
2229
2230 smtp_command = big_buffer;
2231
2232 /* Tell the remote who we are...
2233
2234 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2235 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2236 greeting is of this form. The assumption was that the far end supports it
2237 properly... but experience shows that there are some that give 5xx responses,
2238 even though the banner includes "ESMTP" (there's a bloody-minded one that
2239 says "ESMTP not spoken here"). Cope with that case.
2240
2241 September 2000: Time has passed, and it seems reasonable now to always send
2242 EHLO at the start. It is also convenient to make the change while installing
2243 the TLS stuff.
2244
2245 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2246 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2247 would be no way to send out the mails, so there is now a host list
2248 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2249 PIPELINING problem as well. Maybe it can also be useful to cure other
2250 problems with broken servers.
2251
2252 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2253 Then somebody tried it with a Microsoft mailer... It seems that all other
2254 mailers use upper case for some reason (the RFC is quite clear about case
2255 independence) so, for peace of mind, I gave in. */
2256
2257 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2258
2259 /* Alas; be careful, since this goto is not an error-out, so conceivably
2260 we might set data between here and the target which we assume to exist
2261 and be usable. I can see this coming back to bite us. */
2262 #ifdef SUPPORT_TLS
2263 if (sx->smtps)
2264 {
2265 smtp_peer_options |= OPTION_TLS;
2266 suppress_tls = FALSE;
2267 ob->tls_tempfail_tryclear = FALSE;
2268 smtp_command = US"SSL-on-connect";
2269 goto TLS_NEGOTIATE;
2270 }
2271 #endif
2272
2273 if (sx->esmtp)
2274 {
2275 if (smtp_write_command(sx,
2276 #ifdef EXPERIMENTAL_PIPE_CONNECT
2277 sx->early_pipe_active ? SCMD_BUFFER :
2278 #endif
2279 SCMD_FLUSH,
2280 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2281 goto SEND_FAILED;
2282 sx->esmtp_sent = TRUE;
2283
2284 #ifdef EXPERIMENTAL_PIPE_CONNECT
2285 if (sx->early_pipe_active)
2286 {
2287 sx->pending_EHLO = TRUE;
2288
2289 /* If we have too many authenticators to handle and might need to AUTH
2290 for this transport, pipeline no further as we will need the
2291 list of auth methods offered. Reap the banner and EHLO. */
2292
2293 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2294 && f.smtp_in_early_pipe_no_auth)
2295 {
2296 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2297 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2298 goto SEND_FAILED;
2299 if (sync_responses(sx, 2, 0) != 0)
2300 {
2301 HDEBUG(D_transport)
2302 debug_printf("failed reaping pipelined cmd responses\n");
2303 goto RESPONSE_FAILED;
2304 }
2305 sx->early_pipe_active = FALSE;
2306 }
2307 }
2308 else
2309 #endif
2310 if (!smtp_reap_ehlo(sx))
2311 goto RESPONSE_FAILED;
2312 }
2313 else
2314 DEBUG(D_transport)
2315 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2316
2317 #ifdef EXPERIMENTAL_PIPE_CONNECT
2318 if (!sx->early_pipe_active)
2319 #endif
2320 if (!sx->esmtp)
2321 {
2322 BOOL good_response;
2323 int n = sizeof(sx->buffer);
2324 uschar * rsp = sx->buffer;
2325
2326 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2327 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2328
2329 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2330 goto SEND_FAILED;
2331 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2332 #ifdef EXPERIMENTAL_DSN_INFO
2333 sx->helo_response = string_copy(rsp);
2334 #endif
2335 if (!good_response)
2336 {
2337 /* Handle special logging for a closed connection after HELO
2338 when had previously sent EHLO */
2339
2340 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2341 {
2342 errno = ERRNO_SMTPCLOSED;
2343 goto EHLOHELO_FAILED;
2344 }
2345 memmove(sx->buffer, rsp, Ustrlen(rsp));
2346 goto RESPONSE_FAILED;
2347 }
2348 }
2349
2350 if (sx->esmtp || sx->lmtp)
2351 {
2352 #ifdef EXPERIMENTAL_PIPE_CONNECT
2353 if (!sx->early_pipe_active)
2354 #endif
2355 {
2356 sx->peer_offered = ehlo_response(sx->buffer,
2357 OPTION_TLS /* others checked later */
2358 #ifdef EXPERIMENTAL_PIPE_CONNECT
2359 | (sx->early_pipe_ok
2360 ? OPTION_IGNQ
2361 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2362 #ifdef SUPPORT_I18N
2363 | OPTION_UTF8
2364 #endif
2365 | OPTION_EARLY_PIPE
2366 : 0
2367 )
2368 #endif
2369 );
2370 #ifdef EXPERIMENTAL_PIPE_CONNECT
2371 if (sx->early_pipe_ok)
2372 {
2373 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2374
2375 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2376 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2377 {
2378 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2379 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2380 write_ehlo_cache_entry(sx);
2381 }
2382 }
2383 #endif
2384 }
2385
2386 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2387
2388 #ifdef SUPPORT_TLS
2389 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2390 #endif
2391 }
2392 }
2393
2394 /* For continuing deliveries down the same channel, having re-exec'd the socket
2395 is the standard input; for a socket held open from verify it is recorded
2396 in the cutthrough context block. Either way we don't need to redo EHLO here
2397 (but may need to do so for TLS - see below).
2398 Set up the pointer to where subsequent commands will be left, for
2399 error messages. Note that smtp_peer_options will have been
2400 set from the command line if they were set in the process that passed the
2401 connection on. */
2402
2403 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2404 as the continue goes via transport_pass_socket() and doublefork and exec.
2405 It does not wait. Unclear how we keep separate host's responses
2406 separate - we could match up by host ip+port as a bodge. */
2407
2408 else
2409 {
2410 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2411 {
2412 sx->cctx = cutthrough.cctx;
2413 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2414 }
2415 else
2416 {
2417 sx->cctx.sock = 0; /* stdin */
2418 sx->cctx.tls_ctx = NULL;
2419 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2420 }
2421 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2422 smtp_command = big_buffer;
2423 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2424
2425 /* For a continued connection with TLS being proxied for us, or a
2426 held-open verify connection with TLS, nothing more to do. */
2427
2428 if ( continue_proxy_cipher
2429 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2430 && cutthrough.is_tls)
2431 )
2432 {
2433 sx->peer_offered = smtp_peer_options;
2434 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2435 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2436 continue_proxy_cipher ? "proxied" : "verify conn with");
2437 return OK;
2438 }
2439 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2440 }
2441
2442 /* If TLS is available on this connection, whether continued or not, attempt to
2443 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2444 send another EHLO - the server may give a different answer in secure mode. We
2445 use a separate buffer for reading the response to STARTTLS so that if it is
2446 negative, the original EHLO data is available for subsequent analysis, should
2447 the client not be required to use TLS. If the response is bad, copy the buffer
2448 for error analysis. */
2449
2450 #ifdef SUPPORT_TLS
2451 if ( smtp_peer_options & OPTION_TLS
2452 && !suppress_tls
2453 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2454 && ( !sx->verify
2455 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2456 ) )
2457 {
2458 uschar buffer2[4096];
2459
2460 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2461 goto SEND_FAILED;
2462
2463 #ifdef EXPERIMENTAL_PIPE_CONNECT
2464 /* If doing early-pipelining reap the banner and EHLO-response but leave
2465 the response for the STARTTLS we just sent alone. */
2466
2467 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2468 {
2469 HDEBUG(D_transport)
2470 debug_printf("failed reaping pipelined cmd responses\n");
2471 goto RESPONSE_FAILED;
2472 }
2473 #endif
2474
2475 /* If there is an I/O error, transmission of this message is deferred. If
2476 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2477 false, we also defer. However, if there is a temporary rejection of STARTTLS
2478 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2479 STARTTLS, we carry on. This means we will try to send the message in clear,
2480 unless the host is in hosts_require_tls (tested below). */
2481
2482 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2483 {
2484 if ( errno != 0
2485 || buffer2[0] == 0
2486 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2487 )
2488 {
2489 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2490 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2491 goto RESPONSE_FAILED;
2492 }
2493 }
2494
2495 /* STARTTLS accepted: try to negotiate a TLS session. */
2496
2497 else
2498 TLS_NEGOTIATE:
2499 {
2500 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2501 {
2502 /* TLS negotiation failed; give an error. From outside, this function may
2503 be called again to try in clear on a new connection, if the options permit
2504 it for this host. */
2505 GNUTLS_CONN_FAILED:
2506 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2507
2508 # ifdef SUPPORT_DANE
2509 if (sx->conn_args.dane)
2510 {
2511 log_write(0, LOG_MAIN,
2512 "DANE attempt failed; TLS connection to %s [%s]: %s",
2513 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2514 # ifndef DISABLE_EVENT
2515 (void) event_raise(sx->conn_args.tblock->event_action,
2516 US"dane:fail", US"validation-failure"); /* could do with better detail */
2517 # endif
2518 }
2519 # endif
2520
2521 errno = ERRNO_TLSFAILURE;
2522 message = string_sprintf("TLS session: %s", tls_errstr);
2523 sx->send_quit = FALSE;
2524 goto TLS_FAILED;
2525 }
2526
2527 /* TLS session is set up */
2528
2529 smtp_peer_options_wrap = smtp_peer_options;
2530 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2531 if (addr->transport_return == PENDING_DEFER)
2532 {
2533 addr->cipher = tls_out.cipher;
2534 addr->ourcert = tls_out.ourcert;
2535 addr->peercert = tls_out.peercert;
2536 addr->peerdn = tls_out.peerdn;
2537 addr->ocsp = tls_out.ocsp;
2538 }
2539 }
2540 }
2541
2542 /* if smtps, we'll have smtp_command set to something else; always safe to
2543 reset it here. */
2544 smtp_command = big_buffer;
2545
2546 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2547 helo_data is null, we are dealing with a connection that was passed from
2548 another process, and so we won't have expanded helo_data above. We have to
2549 expand it here. $sending_ip_address and $sending_port are set up right at the
2550 start of the Exim process (in exim.c). */
2551
2552 if (tls_out.active.sock >= 0)
2553 {
2554 uschar * greeting_cmd;
2555
2556 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2557 {
2558 uschar *message = string_sprintf("failed to expand helo_data: %s",
2559 expand_string_message);
2560 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2561 yield = DEFER;
2562 goto SEND_QUIT;
2563 }
2564
2565 #ifdef EXPERIMENTAL_PIPE_CONNECT
2566 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2567 We're unlikely to get the group sent and delivered before the server sends its
2568 banner, but it's still worth sending as a group.
2569 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2570 the reverse. */
2571
2572 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2573 {
2574 sx->peer_offered = sx->ehlo_resp.crypted_features;
2575 if ((sx->early_pipe_active =
2576 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2577 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2578 }
2579 #endif
2580
2581 /* For SMTPS we need to wait for the initial OK response. */
2582 if (sx->smtps)
2583 #ifdef EXPERIMENTAL_PIPE_CONNECT
2584 if (sx->early_pipe_active)
2585 {
2586 sx->pending_BANNER = TRUE;
2587 sx->outblock.cmd_count = 1;
2588 }
2589 else
2590 #endif
2591 if (!smtp_reap_banner(sx))
2592 goto RESPONSE_FAILED;
2593
2594 if (sx->lmtp)
2595 greeting_cmd = US"LHLO";
2596 else if (sx->esmtp)
2597 greeting_cmd = US"EHLO";
2598 else
2599 {
2600 greeting_cmd = US"HELO";
2601 DEBUG(D_transport)
2602 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2603 }
2604
2605 if (smtp_write_command(sx,
2606 #ifdef EXPERIMENTAL_PIPE_CONNECT
2607 sx->early_pipe_active ? SCMD_BUFFER :
2608 #endif
2609 SCMD_FLUSH,
2610 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2611 goto SEND_FAILED;
2612
2613 #ifdef EXPERIMENTAL_PIPE_CONNECT
2614 if (sx->early_pipe_active)
2615 sx->pending_EHLO = TRUE;
2616 else
2617 #endif
2618 {
2619 if (!smtp_reap_ehlo(sx))
2620 #ifdef USE_GNUTLS
2621 {
2622 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2623 cert late, under TLS1.3 - which means here; the first time we try to
2624 receive crypted data. Treat it as if it was a connect-time failure.
2625 See also the early-pipe equivalent... which will be hard; every call
2626 to sync_responses will need to check the result.
2627 It would be nicer to have GnuTLS check the cert during the handshake.
2628 Can it do that, with all the flexibility we need? */
2629
2630 tls_errstr = US"error on first read";
2631 goto GNUTLS_CONN_FAILED;
2632 }
2633 #else
2634 goto RESPONSE_FAILED;
2635 #endif
2636 smtp_peer_options = 0;
2637 }
2638 }
2639
2640 /* If the host is required to use a secure channel, ensure that we
2641 have one. */
2642
2643 else if ( sx->smtps
2644 # ifdef SUPPORT_DANE
2645 || sx->conn_args.dane
2646 # endif
2647 # ifdef EXPERIMENTAL_REQUIRETLS
2648 || tls_requiretls & REQUIRETLS_MSG
2649 # endif
2650 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2651 )
2652 {
2653 errno =
2654 # ifdef EXPERIMENTAL_REQUIRETLS
2655 tls_requiretls & REQUIRETLS_MSG ? ERRNO_REQUIRETLS :
2656 # endif
2657 ERRNO_TLSREQUIRED;
2658 message = string_sprintf("a TLS session is required, but %s",
2659 smtp_peer_options & OPTION_TLS
2660 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2661 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2662 if (sx->conn_args.dane)
2663 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2664 smtp_peer_options & OPTION_TLS
2665 ? US"validation-failure" /* could do with better detail */
2666 : US"starttls-not-supported");
2667 # endif
2668 goto TLS_FAILED;
2669 }
2670 #endif /*SUPPORT_TLS*/
2671
2672 /* If TLS is active, we have just started it up and re-done the EHLO command,
2673 so its response needs to be analyzed. If TLS is not active and this is a
2674 continued session down a previously-used socket, we haven't just done EHLO, so
2675 we skip this. */
2676
2677 if (continue_hostname == NULL
2678 #ifdef SUPPORT_TLS
2679 || tls_out.active.sock >= 0
2680 #endif
2681 )
2682 {
2683 if (sx->esmtp || sx->lmtp)
2684 {
2685 #ifdef EXPERIMENTAL_PIPE_CONNECT
2686 if (!sx->early_pipe_active)
2687 #endif
2688 {
2689 sx->peer_offered = ehlo_response(sx->buffer,
2690 0 /* no TLS */
2691 #ifdef EXPERIMENTAL_PIPE_CONNECT
2692 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2693 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2694 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8 | OPTION_REQUIRETLS
2695 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2696
2697 #else
2698
2699 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2700 | OPTION_CHUNKING
2701 | OPTION_PRDR
2702 # ifdef SUPPORT_I18N
2703 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2704 /*XXX if we hand peercaps on to continued-conn processes,
2705 must not depend on this addr */
2706 # endif
2707 | OPTION_DSN
2708 | OPTION_PIPE
2709 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2710 # if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2711 | (tls_requiretls & REQUIRETLS_MSG ? OPTION_REQUIRETLS : 0)
2712 # endif
2713 #endif
2714 );
2715 #ifdef EXPERIMENTAL_PIPE_CONNECT
2716 if (tls_out.active.sock >= 0)
2717 sx->ehlo_resp.crypted_features = sx->peer_offered;
2718 #endif
2719 }
2720
2721 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2722 lmtp_ignore_quota option was set. */
2723
2724 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2725
2726 /* If the response to EHLO specified support for the SIZE parameter, note
2727 this, provided size_addition is non-negative. */
2728
2729 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2730
2731 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2732 the current host, esmtp will be false, so PIPELINING can never be used. If
2733 the current host matches hosts_avoid_pipelining, don't do it. */
2734
2735 if ( sx->peer_offered & OPTION_PIPE
2736 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2737 smtp_peer_options |= OPTION_PIPE;
2738
2739 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2740 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2741
2742 if ( sx->peer_offered & OPTION_CHUNKING
2743 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2744 sx->peer_offered &= ~OPTION_CHUNKING;
2745
2746 if (sx->peer_offered & OPTION_CHUNKING)
2747 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2748
2749 #ifndef DISABLE_PRDR
2750 if ( sx->peer_offered & OPTION_PRDR
2751 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2752 sx->peer_offered &= ~OPTION_PRDR;
2753
2754 if (sx->peer_offered & OPTION_PRDR)
2755 DEBUG(D_transport) debug_printf("PRDR usable\n");
2756 #endif
2757
2758 /* Note if the server supports DSN */
2759 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2760 DEBUG(D_transport) debug_printf("%susing DSN\n",
2761 sx->peer_offered & OPTION_DSN ? "" : "not ");
2762
2763 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2764 if (sx->peer_offered & OPTION_REQUIRETLS)
2765 {
2766 smtp_peer_options |= OPTION_REQUIRETLS;
2767 DEBUG(D_transport) debug_printf(
2768 tls_requiretls & REQUIRETLS_MSG
2769 ? "using REQUIRETLS\n" : "REQUIRETLS offered\n");
2770 }
2771 #endif
2772
2773 #ifdef EXPERIMENTAL_PIPE_CONNECT
2774 if ( sx->early_pipe_ok
2775 && !sx->early_pipe_active
2776 && tls_out.active.sock >= 0
2777 && smtp_peer_options & OPTION_PIPE
2778 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2779 & OPTION_EARLY_PIPE)
2780 {
2781 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2782 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2783 write_ehlo_cache_entry(sx);
2784 }
2785 #endif
2786
2787 /* Note if the response to EHLO specifies support for the AUTH extension.
2788 If it has, check that this host is one we want to authenticate to, and do
2789 the business. The host name and address must be available when the
2790 authenticator's client driver is running. */
2791
2792 switch (yield = smtp_auth(sx))
2793 {
2794 default: goto SEND_QUIT;
2795 case OK: break;
2796 case FAIL_SEND: goto SEND_FAILED;
2797 case FAIL: goto RESPONSE_FAILED;
2798 }
2799 }
2800 }
2801 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2802
2803 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2804 message-specific. */
2805
2806 sx->setting_up = FALSE;
2807
2808 #ifdef SUPPORT_I18N
2809 if (sx->addrlist->prop.utf8_msg)
2810 {
2811 uschar * s;
2812
2813 /* If the transport sets a downconversion mode it overrides any set by ACL
2814 for the message. */
2815
2816 if ((s = ob->utf8_downconvert))
2817 {
2818 if (!(s = expand_string(s)))
2819 {
2820 message = string_sprintf("failed to expand utf8_downconvert: %s",
2821 expand_string_message);
2822 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2823 yield = DEFER;
2824 goto SEND_QUIT;
2825 }
2826 switch (*s)
2827 {
2828 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2829 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2830 break;
2831 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2832 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2833 break;
2834 case '-': if (s[1] == '1')
2835 {
2836 sx->addrlist->prop.utf8_downcvt = FALSE;
2837 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2838 }
2839 break;
2840 }
2841 }
2842
2843 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2844 && !sx->addrlist->prop.utf8_downcvt_maybe;
2845 DEBUG(D_transport) if (!sx->utf8_needed)
2846 debug_printf("utf8: %s downconvert\n",
2847 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2848 }
2849
2850 /* If this is an international message we need the host to speak SMTPUTF8 */
2851 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2852 {
2853 errno = ERRNO_UTF8_FWD;
2854 goto RESPONSE_FAILED;
2855 }
2856 #endif /*SUPPORT_I18N*/
2857
2858 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2859 /*XXX should tls_requiretls actually be per-addr? */
2860
2861 if ( tls_requiretls & REQUIRETLS_MSG
2862 && !(sx->peer_offered & OPTION_REQUIRETLS)
2863 )
2864 {
2865 sx->setting_up = TRUE;
2866 errno = ERRNO_REQUIRETLS;
2867 message = US"REQUIRETLS support is required from the server"
2868 " but it was not offered";
2869 DEBUG(D_transport) debug_printf("%s\n", message);
2870 goto TLS_FAILED;
2871 }
2872 #endif
2873
2874 return OK;
2875
2876
2877 {
2878 int code;
2879
2880 RESPONSE_FAILED:
2881 message = NULL;
2882 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2883 sx->buffer, &code, &message, &pass_message);
2884 yield = DEFER;
2885 goto FAILED;
2886
2887 SEND_FAILED:
2888 code = '4';
2889 message = US string_sprintf("send() to %s [%s] failed: %s",
2890 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2891 sx->send_quit = FALSE;
2892 yield = DEFER;
2893 goto FAILED;
2894
2895 EHLOHELO_FAILED:
2896 code = '4';
2897 message = string_sprintf("Remote host closed connection in response to %s"
2898 " (EHLO response was: %s)", smtp_command, sx->buffer);
2899 sx->send_quit = FALSE;
2900 yield = DEFER;
2901 goto FAILED;
2902
2903 /* This label is jumped to directly when a TLS negotiation has failed,
2904 or was not done for a host for which it is required. Values will be set
2905 in message and errno, and setting_up will always be true. Treat as
2906 a temporary error. */
2907
2908 #ifdef SUPPORT_TLS
2909 TLS_FAILED:
2910 # ifdef EXPERIMENTAL_REQUIRETLS
2911 if (errno == ERRNO_REQUIRETLS)
2912 code = '5', yield = FAIL;
2913 /*XXX DSN will be labelled 500; prefer 530 5.7.4 */
2914 else
2915 # endif
2916 code = '4', yield = DEFER;
2917 goto FAILED;
2918 #endif
2919
2920 /* The failure happened while setting up the call; see if the failure was
2921 a 5xx response (this will either be on connection, or following HELO - a 5xx
2922 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2923 fail all addresses, as this host is never going to accept them. For other
2924 errors during setting up (timeouts or whatever), defer all addresses, and
2925 yield DEFER, so that the host is not tried again for a while.
2926
2927 XXX This peeking for another host feels like a layering violation. We want
2928 to note the host as unusable, but down here we shouldn't know if this was
2929 the last host to try for the addr(list). Perhaps the upper layer should be
2930 the one to do set_errno() ? The problem is that currently the addr is where
2931 errno etc. are stashed, but until we run out of hosts to try the errors are
2932 host-specific. Maybe we should enhance the host_item definition? */
2933
2934 FAILED:
2935 sx->ok = FALSE; /* For when reached by GOTO */
2936 set_errno(sx->addrlist, errno, message,
2937 sx->conn_args.host->next
2938 ? DEFER
2939 : code == '5'
2940 #ifdef SUPPORT_I18N
2941 || errno == ERRNO_UTF8_FWD
2942 #endif
2943 ? FAIL : DEFER,
2944 pass_message, sx->conn_args.host
2945 #ifdef EXPERIMENTAL_DSN_INFO
2946 , sx->smtp_greeting, sx->helo_response
2947 #endif
2948 );
2949 }
2950
2951
2952 SEND_QUIT:
2953
2954 if (sx->send_quit)
2955 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2956
2957 #ifdef SUPPORT_TLS
2958 if (sx->cctx.tls_ctx)
2959 {
2960 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2961 sx->cctx.tls_ctx = NULL;
2962 }
2963 #endif
2964
2965 /* Close the socket, and return the appropriate value, first setting
2966 works because the NULL setting is passed back to the calling process, and
2967 remote_max_parallel is forced to 1 when delivering over an existing connection,
2968 */
2969
2970 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2971 if (sx->send_quit)
2972 {
2973 shutdown(sx->cctx.sock, SHUT_WR);
2974 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2975 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2976 i--; /* drain socket */
2977 sx->send_quit = FALSE;
2978 }
2979 (void)close(sx->cctx.sock);
2980 sx->cctx.sock = -1;
2981
2982 #ifndef DISABLE_EVENT
2983 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2984 #endif
2985
2986 continue_transport = NULL;
2987 continue_hostname = NULL;
2988 return yield;
2989 }
2990
2991
2992
2993
2994 /* Create the string of options that will be appended to the MAIL FROM:
2995 in the connection context buffer */
2996
2997 static int
2998 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2999 {
3000 uschar * p = sx->buffer;
3001 address_item * addr;
3002 int address_count;
3003
3004 *p = 0;
3005
3006 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3007 send it, adding something to the message size to allow for imprecision
3008 and things that get added en route. Exim keeps the number of lines
3009 in a message, so we can give an accurate value for the original message, but we
3010 need some additional to handle added headers. (Double "." characters don't get
3011 included in the count.) */
3012
3013 if ( message_size > 0
3014 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3015 {
3016 /*XXX problem here under spool_files_wireformat?
3017 Or just forget about lines? Or inflate by a fixed proportion? */
3018
3019 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3020 while (*p) p++;
3021 }
3022
3023 #ifndef DISABLE_PRDR
3024 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3025 request that */
3026
3027 sx->prdr_active = FALSE;
3028 if (sx->peer_offered & OPTION_PRDR)
3029 for (address_item * addr = addrlist; addr; addr = addr->next)
3030 if (addr->transport_return == PENDING_DEFER)
3031 {
3032 for (addr = addr->next; addr; addr = addr->next)
3033 if (addr->transport_return == PENDING_DEFER)
3034 { /* at least two recipients to send */
3035 sx->prdr_active = TRUE;
3036 sprintf(CS p, " PRDR"); p += 5;
3037 break;
3038 }
3039 break;
3040 }
3041 #endif
3042
3043 #ifdef SUPPORT_I18N
3044 /* If it supports internationalised messages, and this meesage need that,
3045 request it */
3046
3047 if ( sx->peer_offered & OPTION_UTF8
3048 && addrlist->prop.utf8_msg
3049 && !addrlist->prop.utf8_downcvt
3050 )
3051 Ustrcpy(p, " SMTPUTF8"), p += 9;
3052 #endif
3053
3054 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
3055 if (tls_requiretls & REQUIRETLS_MSG)
3056 Ustrcpy(p, " REQUIRETLS") , p += 11;
3057 #endif
3058
3059 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3060 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3061 addr && address_count < sx->max_rcpt;
3062 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3063 {
3064 address_count++;
3065 if (!(addr->dsn_flags & rf_dsnlasthop))
3066 {
3067 sx->dsn_all_lasthop = FALSE;
3068 break;
3069 }
3070 }
3071
3072 /* Add any DSN flags to the mail command */
3073
3074 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3075 {
3076 if (dsn_ret == dsn_ret_hdrs)
3077 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3078 else if (dsn_ret == dsn_ret_full)
3079 { Ustrcpy(p, " RET=FULL"); p += 9; }
3080
3081 if (dsn_envid)
3082 {
3083 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3084 while (*p) p++;
3085 }
3086 }
3087
3088 /* If an authenticated_sender override has been specified for this transport
3089 instance, expand it. If the expansion is forced to fail, and there was already
3090 an authenticated_sender for this message, the original value will be used.
3091 Other expansion failures are serious. An empty result is ignored, but there is
3092 otherwise no check - this feature is expected to be used with LMTP and other
3093 cases where non-standard addresses (e.g. without domains) might be required. */
3094
3095 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3096 return ERROR;
3097
3098 return OK;
3099 }
3100
3101
3102 static void
3103 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3104 {
3105 uschar * p = sx->buffer;
3106 *p = 0;
3107
3108 /* Add any DSN flags to the rcpt command */
3109
3110 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3111 {
3112 if (addr->dsn_flags & rf_dsnflags)
3113 {
3114 BOOL first = TRUE;
3115
3116 Ustrcpy(p, " NOTIFY=");
3117 while (*p) p++;
3118 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3119 {
3120 if (!first) *p++ = ',';
3121 first = FALSE;
3122 Ustrcpy(p, rf_names[i]);
3123 while (*p) p++;
3124 }
3125 }
3126
3127 if (addr->dsn_orcpt)
3128 {
3129 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3130 addr->dsn_orcpt);
3131 while (*p) p++;
3132 }
3133 }
3134 }
3135
3136
3137
3138 /*
3139 Return:
3140 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3141 -1 MAIL response error
3142 -2 any non-MAIL read i/o error
3143 -3 non-MAIL response timeout
3144 -4 internal error; channel still usable
3145 -5 transmit failed
3146 */
3147
3148 int
3149 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3150 {
3151 address_item * addr;
3152 int address_count;
3153 int rc;
3154
3155 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3156 {
3157 *yield = ERROR;
3158 return -4;
3159 }
3160
3161 /* From here until we send the DATA command, we can make use of PIPELINING
3162 if the server host supports it. The code has to be able to check the responses
3163 at any point, for when the buffer fills up, so we write it totally generally.
3164 When PIPELINING is off, each command written reports that it has flushed the
3165 buffer. */
3166
3167 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3168
3169 {
3170 uschar * s = sx->from_addr;
3171 #ifdef SUPPORT_I18N
3172 uschar * errstr = NULL;
3173
3174 /* If we must downconvert, do the from-address here. Remember we had to
3175 for the to-addresses (done below), and also (ugly) for re-doing when building
3176 the delivery log line. */
3177
3178 if ( sx->addrlist->prop.utf8_msg
3179 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3180 )
3181 {
3182 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3183 {
3184 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3185 *yield = ERROR;
3186 return -4;
3187 }
3188 setflag(sx->addrlist, af_utf8_downcvt);
3189 }
3190 #endif
3191
3192 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3193 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3194 }
3195
3196 mail_command = string_copy(big_buffer); /* Save for later error message */
3197
3198 switch(rc)
3199 {
3200 case -1: /* Transmission error */
3201 return -5;
3202
3203 case +1: /* Cmd was sent */
3204 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3205 (SOB sx->conn_args.ob)->command_timeout))
3206 {
3207 if (errno == 0 && sx->buffer[0] == '4')
3208 {
3209 errno = ERRNO_MAIL4XX;
3210 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3211 }
3212 return -1;
3213 }
3214 sx->pending_MAIL = FALSE;
3215 break;
3216
3217 /* otherwise zero: command queued for pipeline */
3218 }
3219
3220 /* Pass over all the relevant recipient addresses for this host, which are the
3221 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3222 several before we have to read the responses for those seen so far. This
3223 checking is done by a subroutine because it also needs to be done at the end.
3224 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3225 the next one if not all are sent.
3226
3227 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3228 last address because we want to abort if any recipients have any kind of
3229 problem, temporary or permanent. We know that all recipient addresses will have
3230 the PENDING_DEFER status, because only one attempt is ever made, and we know
3231 that max_rcpt will be large, so all addresses will be done at once.
3232
3233 For verify we flush the pipeline after any (the only) rcpt address. */
3234
3235 for (addr = sx->first_addr, address_count = 0;
3236 addr && address_count < sx->max_rcpt;
3237 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3238 {
3239 int count;
3240 BOOL no_flush;
3241 uschar * rcpt_addr;
3242
3243 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3244 ? dsn_support_yes : dsn_support_no;
3245
3246 address_count++;
3247 no_flush = pipelining_active && !sx->verify
3248 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3249
3250 build_rcptcmd_options(sx, addr);
3251
3252 /* Now send the RCPT command, and process outstanding responses when
3253 necessary. After a timeout on RCPT, we just end the function, leaving the
3254 yield as OK, because this error can often mean that there is a problem with
3255 just one address, so we don't want to delay the host. */
3256
3257 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3258
3259 #ifdef SUPPORT_I18N
3260 if ( testflag(sx->addrlist, af_utf8_downcvt)
3261 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3262 )
3263 {
3264 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3265 errno = ERRNO_EXPANDFAIL;
3266 return -5; /*XXX too harsh? */
3267 }
3268 #endif
3269
3270 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3271 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3272
3273 if (count < 0) return -5;
3274 if (count > 0)
3275 {
3276 switch(sync_responses(sx, count, 0))
3277 {
3278 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3279 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3280 break;
3281
3282 case 1: sx->ok = T