TLS: move from SUPPORT_TLS to DISABLE_TLS macro for the build
[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 #ifndef DISABLE_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 #ifndef DISABLE_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(DISABLE_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 #ifndef DISABLE_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(DISABLE_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 #ifndef DISABLE_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 #ifndef DISABLE_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 # ifdef EXPERIMENTAL_TLS_RESUME
187 { "tls_resumption_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_resumption_hosts) },
189 # endif
190 { "tls_sni", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_sni) },
192 { "tls_tempfail_tryclear", opt_bool,
193 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
194 { "tls_try_verify_hosts", opt_stringptr,
195 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
196 { "tls_verify_cert_hostnames", opt_stringptr,
197 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
198 { "tls_verify_certificates", opt_stringptr,
199 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
200 { "tls_verify_hosts", opt_stringptr,
201 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) },
202 #endif
203 #ifdef SUPPORT_I18N
204 { "utf8_downconvert", opt_stringptr,
205 (void *)offsetof(smtp_transport_options_block, utf8_downconvert) },
206 #endif
207 };
208
209 /* Size of the options list. An extern variable has to be used so that its
210 address can appear in the tables drtables.c. */
211
212 int smtp_transport_options_count = nelem(smtp_transport_options);
213
214
215 #ifdef MACRO_PREDEF
216
217 /* Dummy values */
218 smtp_transport_options_block smtp_transport_option_defaults = {0};
219 void smtp_transport_init(transport_instance *tblock) {}
220 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
221 void smtp_transport_closedown(transport_instance *tblock) {}
222
223 #else /*!MACRO_PREDEF*/
224
225
226 /* Default private options block for the smtp transport. */
227
228 smtp_transport_options_block smtp_transport_option_defaults = {
229 .hosts = NULL,
230 .fallback_hosts = NULL,
231 .hostlist = NULL,
232 .fallback_hostlist = NULL,
233 .helo_data = US"$primary_hostname",
234 .interface = NULL,
235 .port = NULL,
236 .protocol = US"smtp",
237 .dscp = NULL,
238 .serialize_hosts = NULL,
239 .hosts_try_auth = NULL,
240 .hosts_require_auth = NULL,
241 .hosts_try_chunking = US"*",
242 #ifdef SUPPORT_DANE
243 .hosts_try_dane = US"*",
244 .hosts_require_dane = NULL,
245 .dane_require_tls_ciphers = NULL,
246 #endif
247 .hosts_try_fastopen = NULL,
248 #ifndef DISABLE_PRDR
249 .hosts_try_prdr = US"*",
250 #endif
251 #ifndef DISABLE_OCSP
252 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
253 .hosts_require_ocsp = NULL,
254 #endif
255 .hosts_require_tls = NULL,
256 .hosts_avoid_tls = NULL,
257 .hosts_verify_avoid_tls = NULL,
258 .hosts_avoid_pipelining = NULL,
259 #ifdef EXPERIMENTAL_PIPE_CONNECT
260 .hosts_pipe_connect = NULL,
261 #endif
262 .hosts_avoid_esmtp = NULL,
263 #ifndef DISABLE_TLS
264 .hosts_nopass_tls = NULL,
265 .hosts_noproxy_tls = NULL,
266 #endif
267 .command_timeout = 5*60,
268 .connect_timeout = 5*60,
269 .data_timeout = 5*60,
270 .final_timeout = 10*60,
271 .size_addition = 1024,
272 .hosts_max_try = 5,
273 .hosts_max_try_hardlimit = 50,
274 .address_retry_include_sender = TRUE,
275 .allow_localhost = FALSE,
276 .authenticated_sender_force = FALSE,
277 .gethostbyname = FALSE,
278 .dns_qualify_single = TRUE,
279 .dns_search_parents = FALSE,
280 .dnssec = { .request=NULL, .require=NULL },
281 .delay_after_cutoff = TRUE,
282 .hosts_override = FALSE,
283 .hosts_randomize = FALSE,
284 .keepalive = TRUE,
285 .lmtp_ignore_quota = FALSE,
286 .expand_retry_include_ip_address = NULL,
287 .retry_include_ip_address = TRUE,
288 #ifdef SUPPORT_SOCKS
289 .socks_proxy = NULL,
290 #endif
291 #ifndef DISABLE_TLS
292 .tls_certificate = NULL,
293 .tls_crl = NULL,
294 .tls_privatekey = NULL,
295 .tls_require_ciphers = NULL,
296 .tls_sni = NULL,
297 .tls_verify_certificates = US"system",
298 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
299 .tls_tempfail_tryclear = TRUE,
300 # ifdef EXPERIMENTAL_TLS_RESUME
301 .tls_resumption_hosts = NULL,
302 # endif
303 .tls_verify_hosts = NULL,
304 .tls_try_verify_hosts = US"*",
305 .tls_verify_cert_hostnames = US"*",
306 #endif
307 #ifdef SUPPORT_I18N
308 .utf8_downconvert = NULL,
309 #endif
310 #ifndef DISABLE_DKIM
311 .dkim =
312 {.dkim_domain = NULL,
313 .dkim_identity = NULL,
314 .dkim_private_key = NULL,
315 .dkim_selector = NULL,
316 .dkim_canon = NULL,
317 .dkim_sign_headers = NULL,
318 .dkim_strict = NULL,
319 .dkim_hash = US"sha256",
320 .dkim_timestamps = NULL,
321 .dot_stuffed = FALSE,
322 .force_bodyhash = FALSE,
323 # ifdef EXPERIMENTAL_ARC
324 .arc_signspec = NULL,
325 # endif
326 },
327 # ifdef EXPERIMENTAL_ARC
328 .arc_sign = NULL,
329 # endif
330 #endif
331 };
332
333 /* some DSN flags for use later */
334
335 static int rf_list[] = {rf_notify_never, rf_notify_success,
336 rf_notify_failure, rf_notify_delay };
337
338 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
339
340
341
342 /* Local statics */
343
344 static uschar *smtp_command; /* Points to last cmd for error messages */
345 static uschar *mail_command; /* Points to MAIL cmd for error messages */
346 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
347 static BOOL update_waiting; /* TRUE to update the "wait" database */
348
349 /*XXX move to smtp_context */
350 static BOOL pipelining_active; /* current transaction is in pipe mode */
351
352
353 static unsigned ehlo_response(uschar * buf, unsigned checks);
354
355
356 /*************************************************
357 * Setup entry point *
358 *************************************************/
359
360 /* This function is called when the transport is about to be used,
361 but before running it in a sub-process. It is used for two things:
362
363 (1) To set the fallback host list in addresses, when delivering.
364 (2) To pass back the interface, port, protocol, and other options, for use
365 during callout verification.
366
367 Arguments:
368 tblock pointer to the transport instance block
369 addrlist list of addresses about to be transported
370 tf if not NULL, pointer to block in which to return options
371 uid the uid that will be set (not used)
372 gid the gid that will be set (not used)
373 errmsg place for error message (not used)
374
375 Returns: OK always (FAIL, DEFER not used)
376 */
377
378 static int
379 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
380 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
381 {
382 smtp_transport_options_block *ob = SOB tblock->options_block;
383
384 errmsg = errmsg; /* Keep picky compilers happy */
385 uid = uid;
386 gid = gid;
387
388 /* Pass back options if required. This interface is getting very messy. */
389
390 if (tf)
391 {
392 tf->interface = ob->interface;
393 tf->port = ob->port;
394 tf->protocol = ob->protocol;
395 tf->hosts = ob->hosts;
396 tf->hosts_override = ob->hosts_override;
397 tf->hosts_randomize = ob->hosts_randomize;
398 tf->gethostbyname = ob->gethostbyname;
399 tf->qualify_single = ob->dns_qualify_single;
400 tf->search_parents = ob->dns_search_parents;
401 tf->helo_data = ob->helo_data;
402 }
403
404 /* Set the fallback host list for all the addresses that don't have fallback
405 host lists, provided that the local host wasn't present in the original host
406 list. */
407
408 if (!testflag(addrlist, af_local_host_removed))
409 for (; addrlist; addrlist = addrlist->next)
410 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
411
412 return OK;
413 }
414
415
416
417 /*************************************************
418 * Initialization entry point *
419 *************************************************/
420
421 /* Called for each instance, after its options have been read, to
422 enable consistency checks to be done, or anything else that needs
423 to be set up.
424
425 Argument: pointer to the transport instance block
426 Returns: nothing
427 */
428
429 void
430 smtp_transport_init(transport_instance *tblock)
431 {
432 smtp_transport_options_block *ob = SOB tblock->options_block;
433
434 /* Retry_use_local_part defaults FALSE if unset */
435
436 if (tblock->retry_use_local_part == TRUE_UNSET)
437 tblock->retry_use_local_part = FALSE;
438
439 /* Set the default port according to the protocol */
440
441 if (!ob->port)
442 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
443 ? US"lmtp"
444 : strcmpic(ob->protocol, US"smtps") == 0
445 ? US"smtps" : US"smtp";
446
447 /* Set up the setup entry point, to be called before subprocesses for this
448 transport. */
449
450 tblock->setup = smtp_transport_setup;
451
452 /* Complain if any of the timeouts are zero. */
453
454 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
455 ob->final_timeout <= 0)
456 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
457 "command, data, or final timeout value is zero for %s transport",
458 tblock->name);
459
460 /* If hosts_override is set and there are local hosts, set the global
461 flag that stops verify from showing router hosts. */
462
463 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
464
465 /* If there are any fallback hosts listed, build a chain of host items
466 for them, but do not do any lookups at this time. */
467
468 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
469 }
470
471
472
473
474
475 /*************************************************
476 * Set delivery info into all active addresses *
477 *************************************************/
478
479 /* Only addresses whose status is >= PENDING are relevant. A lesser
480 status means that an address is not currently being processed.
481
482 Arguments:
483 addrlist points to a chain of addresses
484 errno_value to put in each address's errno field
485 msg to put in each address's message field
486 rc to put in each address's transport_return field
487 pass_message if TRUE, set the "pass message" flag in the address
488 host if set, mark addrs as having used this host
489 smtp_greeting from peer
490 helo_response from peer
491
492 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
493 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
494 this particular type of timeout.
495
496 Returns: nothing
497 */
498
499 static void
500 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
501 BOOL pass_message, host_item * host
502 #ifdef EXPERIMENTAL_DSN_INFO
503 , const uschar * smtp_greeting, const uschar * helo_response
504 #endif
505 )
506 {
507 int orvalue = 0;
508 if (errno_value == ERRNO_CONNECTTIMEOUT)
509 {
510 errno_value = ETIMEDOUT;
511 orvalue = RTEF_CTOUT;
512 }
513 for (address_item * addr = addrlist; addr; addr = addr->next)
514 if (addr->transport_return >= PENDING)
515 {
516 addr->basic_errno = errno_value;
517 addr->more_errno |= orvalue;
518 if (msg)
519 {
520 addr->message = msg;
521 if (pass_message) setflag(addr, af_pass_message);
522 }
523 addr->transport_return = rc;
524 if (host)
525 {
526 addr->host_used = host;
527 #ifdef EXPERIMENTAL_DSN_INFO
528 if (smtp_greeting)
529 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
530 addr->smtp_greeting = smtp_greeting;
531
532 if (helo_response)
533 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
534 addr->helo_response = helo_response;
535 #endif
536 }
537 }
538 }
539
540 static void
541 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
542 BOOL pass_message)
543 {
544 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
545 #ifdef EXPERIMENTAL_DSN_INFO
546 , NULL, NULL
547 #endif
548 );
549 }
550
551
552 /*************************************************
553 * Check an SMTP response *
554 *************************************************/
555
556 /* This function is given an errno code and the SMTP response buffer
557 to analyse, together with the host identification for generating messages. It
558 sets an appropriate message and puts the first digit of the response code into
559 the yield variable. If no response was actually read, a suitable digit is
560 chosen.
561
562 Arguments:
563 host the current host, to get its name for messages
564 errno_value pointer to the errno value
565 more_errno from the top address for use with ERRNO_FILTER_FAIL
566 buffer the SMTP response buffer
567 yield where to put a one-digit SMTP response code
568 message where to put an error message
569 pass_message set TRUE if message is an SMTP response
570
571 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
572 */
573
574 static BOOL
575 check_response(host_item *host, int *errno_value, int more_errno,
576 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
577 {
578 uschar * pl = pipelining_active ? US"pipelined " : US"";
579 const uschar * s;
580
581 *yield = '4'; /* Default setting is to give a temporary error */
582
583 switch(*errno_value)
584 {
585 case ETIMEDOUT: /* Handle response timeout */
586 *message = US string_sprintf("SMTP timeout after %s%s",
587 pl, smtp_command);
588 if (transport_count > 0)
589 *message = US string_sprintf("%s (%d bytes written)", *message,
590 transport_count);
591 return FALSE;
592
593 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
594 s = string_printing(buffer);
595 while (isspace(*s)) s++;
596 *message = *s == 0
597 ? string_sprintf("Malformed SMTP reply (an empty line) "
598 "in response to %s%s", pl, smtp_command)
599 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
600 pl, smtp_command, s);
601 return FALSE;
602
603 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
604 GnuTLS and TLS1.3 */
605 *message = US"bad first read from TLS conn";
606 return TRUE;
607
608 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
609 can't send QUIT as we mustn't end the DATA. */
610 *message = string_sprintf("transport filter process failed (%d)%s",
611 more_errno,
612 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
613 return FALSE;
614
615 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
616 can't send QUIT as we mustn't end the DATA. */
617 *message =
618 string_sprintf("failed to expand headers_add or headers_remove: %s",
619 expand_string_message);
620 return FALSE;
621
622 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
623 *message = string_sprintf("failed to write a data block");
624 return FALSE;
625
626 #ifdef SUPPORT_I18N
627 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
628 *message = US"utf8 support required but not offered for forwarding";
629 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
630 return TRUE;
631 #endif
632 }
633
634 /* Handle error responses from the remote mailer. */
635
636 if (buffer[0] != 0)
637 {
638 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
639 "%s", pl, smtp_command, s = string_printing(buffer));
640 *pass_message = TRUE;
641 *yield = buffer[0];
642 return TRUE;
643 }
644
645 /* No data was read. If there is no errno, this must be the EOF (i.e.
646 connection closed) case, which causes deferral. An explicit connection reset
647 error has the same effect. Otherwise, put the host's identity in the message,
648 leaving the errno value to be interpreted as well. In all cases, we have to
649 assume the connection is now dead. */
650
651 if (*errno_value == 0 || *errno_value == ECONNRESET)
652 {
653 *errno_value = ERRNO_SMTPCLOSED;
654 *message = US string_sprintf("Remote host closed connection "
655 "in response to %s%s", pl, smtp_command);
656 }
657 else
658 *message = US string_sprintf("%s [%s]", host->name, host->address);
659
660 return FALSE;
661 }
662
663
664
665 /*************************************************
666 * Write error message to logs *
667 *************************************************/
668
669 /* This writes to the main log and to the message log.
670
671 Arguments:
672 host the current host
673 detail the current message (addr_item->message)
674 basic_errno the errno (addr_item->basic_errno)
675
676 Returns: nothing
677 */
678
679 static void
680 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
681 {
682 gstring * message = LOGGING(outgoing_port)
683 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
684 host->port == PORT_NONE ? 25 : host->port)
685 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
686
687 if (suffix)
688 {
689 message = string_fmt_append(message, ": %s", suffix);
690 if (basic_errno > 0)
691 message = string_fmt_append(message, ": %s", strerror(basic_errno));
692 }
693 else
694 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
695
696 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
697 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
698 }
699
700 static void
701 msglog_line(host_item * host, uschar * message)
702 {
703 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
704 host->name, host->address, message);
705 }
706
707
708
709 #ifndef DISABLE_EVENT
710 /*************************************************
711 * Post-defer action *
712 *************************************************/
713
714 /* This expands an arbitrary per-transport string.
715 It might, for example, be used to write to the database log.
716
717 Arguments:
718 addr the address item containing error information
719 host the current host
720
721 Returns: nothing
722 */
723
724 static void
725 deferred_event_raise(address_item *addr, host_item *host)
726 {
727 uschar * action = addr->transport->event_action;
728 const uschar * save_domain;
729 uschar * save_local;
730
731 if (!action)
732 return;
733
734 save_domain = deliver_domain;
735 save_local = deliver_localpart;
736
737 /*XXX would ip & port already be set up? */
738 deliver_host_address = string_copy(host->address);
739 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
740 event_defer_errno = addr->basic_errno;
741
742 router_name = addr->router->name;
743 transport_name = addr->transport->name;
744 deliver_domain = addr->domain;
745 deliver_localpart = addr->local_part;
746
747 (void) event_raise(action, US"msg:host:defer",
748 addr->message
749 ? addr->basic_errno > 0
750 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
751 : string_copy(addr->message)
752 : addr->basic_errno > 0
753 ? string_copy(US strerror(addr->basic_errno))
754 : NULL);
755
756 deliver_localpart = save_local;
757 deliver_domain = save_domain;
758 router_name = transport_name = NULL;
759 }
760 #endif
761
762 /*************************************************
763 * Reap SMTP specific responses *
764 *************************************************/
765 static int
766 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
767 int count)
768 {
769 uschar flushbuffer[4096];
770
771 while (count-- > 0)
772 {
773 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
774 '2', ob->command_timeout)
775 && (errno != 0 || flushbuffer[0] == 0))
776 break;
777 }
778 return count;
779 }
780
781
782 /* Return boolean success */
783
784 static BOOL
785 smtp_reap_banner(smtp_context * sx)
786 {
787 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
788 '2', (SOB sx->conn_args.ob)->command_timeout);
789 #ifdef EXPERIMENTAL_DSN_INFO
790 sx->smtp_greeting = string_copy(sx->buffer);
791 #endif
792 return good_response;
793 }
794
795 static BOOL
796 smtp_reap_ehlo(smtp_context * sx)
797 {
798 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
799 (SOB sx->conn_args.ob)->command_timeout))
800 {
801 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
802 {
803 #ifdef EXPERIMENTAL_DSN_INFO
804 sx->helo_response = string_copy(sx->buffer);
805 #endif
806 return FALSE;
807 }
808 sx->esmtp = FALSE;
809 }
810 #ifdef EXPERIMENTAL_DSN_INFO
811 sx->helo_response = string_copy(sx->buffer);
812 #endif
813 return TRUE;
814 }
815
816
817
818 #ifdef EXPERIMENTAL_PIPE_CONNECT
819 static uschar *
820 ehlo_cache_key(const smtp_context * sx)
821 {
822 host_item * host = sx->conn_args.host;
823 return Ustrchr(host->address, ':')
824 ? string_sprintf("[%s]:%d.EHLO", host->address,
825 host->port == PORT_NONE ? sx->port : host->port)
826 : string_sprintf("%s:%d.EHLO", host->address,
827 host->port == PORT_NONE ? sx->port : host->port);
828 }
829
830 static void
831 write_ehlo_cache_entry(const smtp_context * sx)
832 {
833 open_db dbblock, * dbm_file;
834
835 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
836 {
837 uschar * ehlo_resp_key = ehlo_cache_key(sx);
838 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
839
840 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
841 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
842 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
843
844 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
845 dbfn_close(dbm_file);
846 }
847 }
848
849 static void
850 invalidate_ehlo_cache_entry(smtp_context * sx)
851 {
852 open_db dbblock, * dbm_file;
853
854 if ( sx->early_pipe_active
855 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
856 {
857 uschar * ehlo_resp_key = ehlo_cache_key(sx);
858 dbfn_delete(dbm_file, ehlo_resp_key);
859 dbfn_close(dbm_file);
860 }
861 }
862
863 static BOOL
864 read_ehlo_cache_entry(smtp_context * sx)
865 {
866 open_db dbblock;
867 open_db * dbm_file;
868
869 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
870 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
871 else
872 {
873 uschar * ehlo_resp_key = ehlo_cache_key(sx);
874 dbdata_ehlo_resp * er;
875
876 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
877 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
878 else if (time(NULL) - er->time_stamp > retry_data_expire)
879 {
880 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
881 dbfn_close(dbm_file);
882 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
883 dbfn_delete(dbm_file, ehlo_resp_key);
884 }
885 else
886 {
887 sx->ehlo_resp = er->data;
888 dbfn_close(dbm_file);
889 DEBUG(D_transport) debug_printf(
890 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
891 er->data.cleartext_features, er->data.crypted_features);
892 return TRUE;
893 }
894 dbfn_close(dbm_file);
895 }
896 return FALSE;
897 }
898
899
900
901 /* Return an auths bitmap for the set of AUTH methods offered by the server
902 which match our authenticators. */
903
904 static unsigned short
905 study_ehlo_auths(smtp_context * sx)
906 {
907 uschar * names;
908 auth_instance * au;
909 uschar authnum;
910 unsigned short authbits = 0;
911
912 if (!sx->esmtp) return 0;
913 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
914 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
915 expand_nmax = -1; /* reset */
916 names = string_copyn(expand_nstring[1], expand_nlength[1]);
917
918 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
919 {
920 const uschar * list = names;
921 int sep = ' ';
922 uschar name[32];
923
924 while (string_nextinlist(&list, &sep, name, sizeof(name)))
925 if (strcmpic(au->public_name, name) == 0)
926 { authbits |= BIT(authnum); break; }
927 }
928
929 DEBUG(D_transport)
930 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
931 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
932
933 if (tls_out.active.sock >= 0)
934 sx->ehlo_resp.crypted_auths = authbits;
935 else
936 sx->ehlo_resp.cleartext_auths = authbits;
937 return authbits;
938 }
939
940
941
942
943 /* Wait for and check responses for early-pipelining.
944
945 Called from the lower-level smtp_read_response() function
946 used for general code that assume synchronisation, if context
947 flags indicate outstanding early-pipelining commands. Also
948 called fom sync_responses() which handles pipelined commands.
949
950 Arguments:
951 sx smtp connection context
952 countp number of outstanding responses, adjusted on return
953
954 Return:
955 OK all well
956 DEFER error on first read of TLS'd conn
957 FAIL SMTP error in response
958 */
959 int
960 smtp_reap_early_pipe(smtp_context * sx, int * countp)
961 {
962 BOOL pending_BANNER = sx->pending_BANNER;
963 BOOL pending_EHLO = sx->pending_EHLO;
964 int rc = FAIL;
965
966 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
967 sx->pending_EHLO = FALSE;
968
969 if (pending_BANNER)
970 {
971 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
972 (*countp)--;
973 if (!smtp_reap_banner(sx))
974 {
975 DEBUG(D_transport) debug_printf("bad banner\n");
976 if (tls_out.active.sock >= 0) rc = DEFER;
977 goto fail;
978 }
979 }
980
981 if (pending_EHLO)
982 {
983 unsigned peer_offered;
984 unsigned short authbits = 0, * ap;
985
986 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
987 (*countp)--;
988 if (!smtp_reap_ehlo(sx))
989 {
990 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
991 if (tls_out.active.sock >= 0) rc = DEFER;
992 goto fail;
993 }
994
995 /* Compare the actual EHLO response to the cached value we assumed;
996 on difference, dump or rewrite the cache and arrange for a retry. */
997
998 ap = tls_out.active.sock < 0
999 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1000
1001 peer_offered = ehlo_response(sx->buffer,
1002 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1003 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1004 | OPTION_UTF8 | OPTION_EARLY_PIPE
1005 );
1006 if ( peer_offered != sx->peer_offered
1007 || (authbits = study_ehlo_auths(sx)) != *ap)
1008 {
1009 HDEBUG(D_transport)
1010 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1011 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1012 sx->peer_offered, *ap, peer_offered, authbits);
1013 *(tls_out.active.sock < 0
1014 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1015 *ap = authbits;
1016 if (peer_offered & OPTION_EARLY_PIPE)
1017 write_ehlo_cache_entry(sx);
1018 else
1019 invalidate_ehlo_cache_entry(sx);
1020
1021 return OK; /* just carry on */
1022 }
1023 }
1024 return OK;
1025
1026 fail:
1027 invalidate_ehlo_cache_entry(sx);
1028 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1029 return rc;
1030 }
1031 #endif
1032
1033
1034 /*************************************************
1035 * Synchronize SMTP responses *
1036 *************************************************/
1037
1038 /* This function is called from smtp_deliver() to receive SMTP responses from
1039 the server, and match them up with the commands to which they relate. When
1040 PIPELINING is not in use, this function is called after every command, and is
1041 therefore somewhat over-engineered, but it is simpler to use a single scheme
1042 that works both with and without PIPELINING instead of having two separate sets
1043 of code.
1044
1045 The set of commands that are buffered up with pipelining may start with MAIL
1046 and may end with DATA; in between are RCPT commands that correspond to the
1047 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1048 etc.) are never buffered.
1049
1050 Errors after MAIL or DATA abort the whole process leaving the response in the
1051 buffer. After MAIL, pending responses are flushed, and the original command is
1052 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1053 permitted to reject some recipient addresses while accepting others. However
1054 certain errors clearly abort the whole process. Set the value in
1055 transport_return to PENDING_OK if the address is accepted. If there is a
1056 subsequent general error, it will get reset accordingly. If not, it will get
1057 converted to OK at the end.
1058
1059 Arguments:
1060 sx smtp connection context
1061 count the number of responses to read
1062 pending_DATA 0 if last command sent was not DATA
1063 +1 if previously had a good recipient
1064 -1 if not previously had a good recipient
1065
1066 Returns: 3 if at least one address had 2xx and one had 5xx
1067 2 if at least one address had 5xx but none had 2xx
1068 1 if at least one host had a 2xx response, but none had 5xx
1069 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1070 -1 timeout while reading RCPT response
1071 -2 I/O or other non-response error for RCPT
1072 -3 DATA or MAIL failed - errno and buffer set
1073 -4 banner or EHLO failed (early-pipelining)
1074 -5 banner or EHLO failed (early-pipelining, TLS)
1075 */
1076
1077 static int
1078 sync_responses(smtp_context * sx, int count, int pending_DATA)
1079 {
1080 address_item * addr = sx->sync_addr;
1081 smtp_transport_options_block * ob = sx->conn_args.ob;
1082 int yield = 0;
1083
1084 #ifdef EXPERIMENTAL_PIPE_CONNECT
1085 int rc;
1086 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1087 return rc == FAIL ? -4 : -5;
1088 #endif
1089
1090 /* Handle the response for a MAIL command. On error, reinstate the original
1091 command in big_buffer for error message use, and flush any further pending
1092 responses before returning, except after I/O errors and timeouts. */
1093
1094 if (sx->pending_MAIL)
1095 {
1096 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1097 count--;
1098 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1099 '2', ob->command_timeout))
1100 {
1101 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1102 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1103 if (errno == ERRNO_TLSFAILURE)
1104 return -5;
1105 if (errno == 0 && sx->buffer[0] != 0)
1106 {
1107 int save_errno = 0;
1108 if (sx->buffer[0] == '4')
1109 {
1110 save_errno = ERRNO_MAIL4XX;
1111 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1112 }
1113 count = smtp_discard_responses(sx, ob, count);
1114 errno = save_errno;
1115 }
1116
1117 if (pending_DATA) count--; /* Number of RCPT responses to come */
1118 while (count-- > 0) /* Mark any pending addrs with the host used */
1119 {
1120 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1121 addr->host_used = sx->conn_args.host;
1122 addr = addr->next;
1123 }
1124 return -3;
1125 }
1126 }
1127
1128 if (pending_DATA) count--; /* Number of RCPT responses to come */
1129
1130 /* Read and handle the required number of RCPT responses, matching each one up
1131 with an address by scanning for the next address whose status is PENDING_DEFER.
1132 */
1133
1134 while (count-- > 0)
1135 {
1136 while (addr->transport_return != PENDING_DEFER)
1137 if (!(addr = addr->next))
1138 return -2;
1139
1140 /* The address was accepted */
1141 addr->host_used = sx->conn_args.host;
1142
1143 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1144 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1145 '2', ob->command_timeout))
1146 {
1147 yield |= 1;
1148 addr->transport_return = PENDING_OK;
1149
1150 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1151 ensure that any address-specific retry record is expunged. We do this both
1152 for the basic key and for the version that also includes the sender. */
1153
1154 if (testflag(addr, af_dr_retry_exists))
1155 {
1156 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1157 sender_address);
1158 retry_add_item(addr, altkey, rf_delete);
1159 retry_add_item(addr, addr->address_retry_key, rf_delete);
1160 }
1161 }
1162
1163 /* Error on first TLS read */
1164
1165 else if (errno == ERRNO_TLSFAILURE)
1166 return -5;
1167
1168 /* Timeout while reading the response */
1169
1170 else if (errno == ETIMEDOUT)
1171 {
1172 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1173 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1174 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1175 retry_add_item(addr, addr->address_retry_key, 0);
1176 update_waiting = FALSE;
1177 return -1;
1178 }
1179
1180 /* Handle other errors in obtaining an SMTP response by returning -1. This
1181 will cause all the addresses to be deferred. Restore the SMTP command in
1182 big_buffer for which we are checking the response, so the error message
1183 makes sense. */
1184
1185 else if (errno != 0 || sx->buffer[0] == 0)
1186 {
1187 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
1188 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1189 return -2;
1190 }
1191
1192 /* Handle SMTP permanent and temporary response codes. */
1193
1194 else
1195 {
1196 addr->message =
1197 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1198 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1199 string_printing(sx->buffer));
1200 setflag(addr, af_pass_message);
1201 if (!sx->verify)
1202 msglog_line(sx->conn_args.host, addr->message);
1203
1204 /* The response was 5xx */
1205
1206 if (sx->buffer[0] == '5')
1207 {
1208 addr->transport_return = FAIL;
1209 yield |= 2;
1210 }
1211
1212 /* The response was 4xx */
1213
1214 else
1215 {
1216 addr->transport_return = DEFER;
1217 addr->basic_errno = ERRNO_RCPT4XX;
1218 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1219
1220 if (!sx->verify)
1221 {
1222 #ifndef DISABLE_EVENT
1223 event_defer_errno = addr->more_errno;
1224 msg_event_raise(US"msg:rcpt:host:defer", addr);
1225 #endif
1226
1227 /* Log temporary errors if there are more hosts to be tried.
1228 If not, log this last one in the == line. */
1229
1230 if (sx->conn_args.host->next)
1231 if (LOGGING(outgoing_port))
1232 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1233 sx->conn_args.host->address,
1234 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1235 else
1236 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1237 sx->conn_args.host->address, addr->message);
1238
1239 #ifndef DISABLE_EVENT
1240 else
1241 msg_event_raise(US"msg:rcpt:defer", addr);
1242 #endif
1243
1244 /* Do not put this message on the list of those waiting for specific
1245 hosts, as otherwise it is likely to be tried too often. */
1246
1247 update_waiting = FALSE;
1248
1249 /* Add a retry item for the address so that it doesn't get tried again
1250 too soon. If address_retry_include_sender is true, add the sender address
1251 to the retry key. */
1252
1253 retry_add_item(addr,
1254 ob->address_retry_include_sender
1255 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1256 : addr->address_retry_key,
1257 0);
1258 }
1259 }
1260 }
1261 } /* Loop for next RCPT response */
1262
1263 /* Update where to start at for the next block of responses, unless we
1264 have already handled all the addresses. */
1265
1266 if (addr) sx->sync_addr = addr->next;
1267
1268 /* Handle a response to DATA. If we have not had any good recipients, either
1269 previously or in this block, the response is ignored. */
1270
1271 if (pending_DATA != 0)
1272 {
1273 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1274 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1275 '3', ob->command_timeout))
1276 {
1277 int code;
1278 uschar *msg;
1279 BOOL pass_message;
1280
1281 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1282 return -5;
1283
1284 if (pending_DATA > 0 || (yield & 1) != 0)
1285 {
1286 if (errno == 0 && sx->buffer[0] == '4')
1287 {
1288 errno = ERRNO_DATA4XX;
1289 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1290 }
1291 return -3;
1292 }
1293 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1294 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1295 "is in use and there were no good recipients\n", msg);
1296 }
1297 }
1298
1299 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1300 present) received 3xx. If any RCPTs were handled and yielded anything other
1301 than 4xx, yield will be set non-zero. */
1302
1303 return yield;
1304 }
1305
1306
1307
1308
1309
1310 /* Try an authenticator's client entry */
1311
1312 static int
1313 try_authenticator(smtp_context * sx, auth_instance * au)
1314 {
1315 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1316 host_item * host = sx->conn_args.host; /* host to deliver to */
1317 int rc;
1318
1319 sx->outblock.authenticating = TRUE;
1320 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1321 sx->buffer, sizeof(sx->buffer));
1322 sx->outblock.authenticating = FALSE;
1323 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1324
1325 /* A temporary authentication failure must hold up delivery to
1326 this host. After a permanent authentication failure, we carry on
1327 to try other authentication methods. If all fail hard, try to
1328 deliver the message unauthenticated unless require_auth was set. */
1329
1330 switch(rc)
1331 {
1332 case OK:
1333 f.smtp_authenticated = TRUE; /* stops the outer loop */
1334 client_authenticator = au->name;
1335 if (au->set_client_id)
1336 client_authenticated_id = expand_string(au->set_client_id);
1337 break;
1338
1339 /* Failure after writing a command */
1340
1341 case FAIL_SEND:
1342 return FAIL_SEND;
1343
1344 /* Failure after reading a response */
1345
1346 case FAIL:
1347 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1348 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1349 au->name, host->name, host->address, sx->buffer);
1350 break;
1351
1352 /* Failure by some other means. In effect, the authenticator
1353 decided it wasn't prepared to handle this case. Typically this
1354 is the result of "fail" in an expansion string. Do we need to
1355 log anything here? Feb 2006: a message is now put in the buffer
1356 if logging is required. */
1357
1358 case CANCELLED:
1359 if (*sx->buffer != 0)
1360 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1361 "authentication H=%s [%s] %s", au->name, host->name,
1362 host->address, sx->buffer);
1363 break;
1364
1365 /* Internal problem, message in buffer. */
1366
1367 case ERROR:
1368 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1369 DEFER, FALSE);
1370 return ERROR;
1371 }
1372 return OK;
1373 }
1374
1375
1376
1377
1378 /* Do the client side of smtp-level authentication.
1379
1380 Arguments:
1381 sx smtp connection context
1382
1383 sx->buffer should have the EHLO response from server (gets overwritten)
1384
1385 Returns:
1386 OK Success, or failed (but not required): global "smtp_authenticated" set
1387 DEFER Failed authentication (and was required)
1388 ERROR Internal problem
1389
1390 FAIL_SEND Failed communications - transmit
1391 FAIL - response
1392 */
1393
1394 static int
1395 smtp_auth(smtp_context * sx)
1396 {
1397 host_item * host = sx->conn_args.host; /* host to deliver to */
1398 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1399 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1400 #ifdef EXPERIMENTAL_PIPE_CONNECT
1401 unsigned short authbits = tls_out.active.sock >= 0
1402 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1403 #endif
1404 uschar * fail_reason = US"server did not advertise AUTH support";
1405
1406 f.smtp_authenticated = FALSE;
1407 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1408
1409 if (!regex_AUTH)
1410 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1411
1412 /* Is the server offering AUTH? */
1413
1414 if ( sx->esmtp
1415 &&
1416 #ifdef EXPERIMENTAL_PIPE_CONNECT
1417 sx->early_pipe_active ? authbits
1418 :
1419 #endif
1420 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1421 )
1422 {
1423 uschar * names = NULL;
1424 expand_nmax = -1; /* reset */
1425
1426 #ifdef EXPERIMENTAL_PIPE_CONNECT
1427 if (!sx->early_pipe_active)
1428 #endif
1429 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1430
1431 /* Must not do this check until after we have saved the result of the
1432 regex match above as the check could be another RE. */
1433
1434 if ( require_auth == OK
1435 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1436 {
1437 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1438 fail_reason = US"no common mechanisms were found";
1439
1440 #ifdef EXPERIMENTAL_PIPE_CONNECT
1441 if (sx->early_pipe_active)
1442 {
1443 /* Scan our authenticators (which support use by a client and were offered
1444 by the server (checked at cache-write time)), not suppressed by
1445 client_condition. If one is found, attempt to authenticate by calling its
1446 client function. We are limited to supporting up to 16 authenticator
1447 public-names by the number of bits in a short. */
1448
1449 auth_instance * au;
1450 uschar bitnum;
1451 int rc;
1452
1453 for (bitnum = 0, au = auths;
1454 !f.smtp_authenticated && au && bitnum < 16;
1455 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1456 {
1457 if ( au->client_condition
1458 && !expand_check_condition(au->client_condition, au->name,
1459 US"client authenticator"))
1460 {
1461 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1462 au->name, "client_condition is false");
1463 continue;
1464 }
1465
1466 /* Found data for a listed mechanism. Call its client entry. Set
1467 a flag in the outblock so that data is overwritten after sending so
1468 that reflections don't show it. */
1469
1470 fail_reason = US"authentication attempt(s) failed";
1471
1472 if ((rc = try_authenticator(sx, au)) != OK)
1473 return rc;
1474 }
1475 }
1476 else
1477 #endif
1478
1479 /* Scan the configured authenticators looking for one which is configured
1480 for use as a client, which is not suppressed by client_condition, and
1481 whose name matches an authentication mechanism supported by the server.
1482 If one is found, attempt to authenticate by calling its client function.
1483 */
1484
1485 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1486 {
1487 uschar *p = names;
1488
1489 if ( !au->client
1490 || ( au->client_condition
1491 && !expand_check_condition(au->client_condition, au->name,
1492 US"client authenticator")))
1493 {
1494 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1495 au->name,
1496 (au->client)? "client_condition is false" :
1497 "not configured as a client");
1498 continue;
1499 }
1500
1501 /* Loop to scan supported server mechanisms */
1502
1503 while (*p)
1504 {
1505 int len = Ustrlen(au->public_name);
1506 int rc;
1507
1508 while (isspace(*p)) p++;
1509
1510 if (strncmpic(au->public_name, p, len) != 0 ||
1511 (p[len] != 0 && !isspace(p[len])))
1512 {
1513 while (*p != 0 && !isspace(*p)) p++;
1514 continue;
1515 }
1516
1517 /* Found data for a listed mechanism. Call its client entry. Set
1518 a flag in the outblock so that data is overwritten after sending so
1519 that reflections don't show it. */
1520
1521 fail_reason = US"authentication attempt(s) failed";
1522
1523 if ((rc = try_authenticator(sx, au)) != OK)
1524 return rc;
1525
1526 break; /* If not authenticated, try next authenticator */
1527 } /* Loop for scanning supported server mechanisms */
1528 } /* Loop for further authenticators */
1529 }
1530 }
1531
1532 /* If we haven't authenticated, but are required to, give up. */
1533
1534 if (require_auth == OK && !f.smtp_authenticated)
1535 {
1536 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1537 string_sprintf("authentication required but %s", fail_reason), DEFER,
1538 FALSE);
1539 return DEFER;
1540 }
1541
1542 return OK;
1543 }
1544
1545
1546 /* Construct AUTH appendix string for MAIL TO */
1547 /*
1548 Arguments
1549 buffer to build string
1550 addrlist chain of potential addresses to deliver
1551 ob transport options
1552
1553 Globals f.smtp_authenticated
1554 client_authenticated_sender
1555 Return True on error, otherwise buffer has (possibly empty) terminated string
1556 */
1557
1558 BOOL
1559 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1560 smtp_transport_options_block *ob)
1561 {
1562 uschar *local_authenticated_sender = authenticated_sender;
1563
1564 #ifdef notdef
1565 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1566 #endif
1567
1568 if (ob->authenticated_sender != NULL)
1569 {
1570 uschar *new = expand_string(ob->authenticated_sender);
1571 if (new == NULL)
1572 {
1573 if (!f.expand_string_forcedfail)
1574 {
1575 uschar *message = string_sprintf("failed to expand "
1576 "authenticated_sender: %s", expand_string_message);
1577 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1578 return TRUE;
1579 }
1580 }
1581 else if (new[0] != 0) local_authenticated_sender = new;
1582 }
1583
1584 /* Add the authenticated sender address if present */
1585
1586 if ((f.smtp_authenticated || ob->authenticated_sender_force) &&
1587 local_authenticated_sender != NULL)
1588 {
1589 string_format(buffer, bufsize, " AUTH=%s",
1590 auth_xtextencode(local_authenticated_sender,
1591 Ustrlen(local_authenticated_sender)));
1592 client_authenticated_sender = string_copy(local_authenticated_sender);
1593 }
1594 else
1595 *buffer= 0;
1596
1597 return FALSE;
1598 }
1599
1600
1601
1602 #ifdef SUPPORT_DANE
1603 /* Lookup TLSA record for host/port.
1604 Return: OK success with dnssec; DANE mode
1605 DEFER Do not use this host now, may retry later
1606 FAIL_FORCED No TLSA record; DANE not usable
1607 FAIL Do not use this connection
1608 */
1609
1610 int
1611 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1612 {
1613 /* move this out to host.c given the similarity to dns_lookup() ? */
1614 uschar buffer[300];
1615 const uschar * fullname = buffer;
1616 int rc;
1617 BOOL sec;
1618
1619 /* TLSA lookup string */
1620 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1621
1622 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1623 sec = dns_is_secure(dnsa);
1624 DEBUG(D_transport)
1625 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1626
1627 switch (rc)
1628 {
1629 case DNS_AGAIN:
1630 return DEFER; /* just defer this TLS'd conn */
1631
1632 case DNS_SUCCEED:
1633 if (sec)
1634 {
1635 DEBUG(D_transport)
1636 {
1637 dns_scan dnss;
1638 for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1639 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1640 if (rr->type == T_TLSA && rr->size > 3)
1641 {
1642 uint16_t payload_length = rr->size - 3;
1643 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1644
1645 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1646 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1647 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1648 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1649 sp += sprintf(CS sp, "%02x", *p++);
1650
1651 debug_printf(" %s\n", s);
1652 }
1653 }
1654 return OK;
1655 }
1656 log_write(0, LOG_MAIN,
1657 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1658 /*FALLTRHOUGH*/
1659
1660 case DNS_NODATA: /* no TLSA RR for this lookup */
1661 case DNS_NOMATCH: /* no records at all for this lookup */
1662 return dane_required ? FAIL : FAIL_FORCED;
1663
1664 default:
1665 case DNS_FAIL:
1666 return dane_required ? FAIL : DEFER;
1667 }
1668 }
1669 #endif
1670
1671
1672
1673 typedef struct smtp_compare_s
1674 {
1675 uschar *current_sender_address;
1676 struct transport_instance *tblock;
1677 } smtp_compare_t;
1678
1679
1680 /* Create a unique string that identifies this message, it is based on
1681 sender_address, helo_data and tls_certificate if enabled.
1682 */
1683
1684 static uschar *
1685 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1686 {
1687 address_item * addr1;
1688 uschar * if1 = US"";
1689 uschar * helo1 = US"";
1690 #ifndef DISABLE_TLS
1691 uschar * tlsc1 = US"";
1692 #endif
1693 uschar * save_sender_address = sender_address;
1694 uschar * local_identity = NULL;
1695 smtp_transport_options_block * ob = SOB tblock->options_block;
1696
1697 sender_address = sender;
1698
1699 addr1 = deliver_make_addr (sender, TRUE);
1700 deliver_set_expansions(addr1);
1701
1702 if (ob->interface)
1703 if1 = expand_string(ob->interface);
1704
1705 if (ob->helo_data)
1706 helo1 = expand_string(ob->helo_data);
1707
1708 #ifndef DISABLE_TLS
1709 if (ob->tls_certificate)
1710 tlsc1 = expand_string(ob->tls_certificate);
1711 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1712 #else
1713 local_identity = string_sprintf ("%s^%s", if1, helo1);
1714 #endif
1715
1716 deliver_set_expansions(NULL);
1717 sender_address = save_sender_address;
1718
1719 return local_identity;
1720 }
1721
1722
1723
1724 /* This routine is a callback that is called from transport_check_waiting.
1725 This function will evaluate the incoming message versus the previous
1726 message. If the incoming message is using a different local identity then
1727 we will veto this new message. */
1728
1729 static BOOL
1730 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1731 {
1732 uschar * message_local_identity,
1733 * current_local_identity,
1734 * new_sender_address;
1735
1736 current_local_identity =
1737 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1738
1739 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1740 return 0;
1741
1742 message_local_identity =
1743 smtp_local_identity(new_sender_address, s_compare->tblock);
1744
1745 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1746 }
1747
1748
1749
1750 static unsigned
1751 ehlo_response(uschar * buf, unsigned checks)
1752 {
1753 size_t bsize = Ustrlen(buf);
1754
1755 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1756
1757 #ifndef DISABLE_TLS
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 #ifndef DISABLE_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(DISABLE_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(DISABLE_TLS) && !defined(USE_GNUTLS)
2023 tls_out.sni = NULL;
2024 #endif
2025 tls_out.ocsp = OCSP_NOT_REQ;
2026 #ifdef EXPERIMENTAL_TLS_RESUME
2027 tls_out.resumption = 0;
2028 #endif
2029
2030 /* Flip the legacy TLS-related variables over to the outbound set in case
2031 they're used in the context of the transport. Don't bother resetting
2032 afterward (when being used by a transport) as we're in a subprocess.
2033 For verify, unflipped once the callout is dealt with */
2034
2035 tls_modify_variables(&tls_out);
2036
2037 #ifdef DISABLE_TLS
2038 if (sx->smtps)
2039 {
2040 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2041 DEFER, FALSE);
2042 return ERROR;
2043 }
2044 #endif
2045
2046 /* Make a connection to the host if this isn't a continued delivery, and handle
2047 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2048 specially so they can be identified for retries. */
2049
2050 if (!continue_hostname)
2051 {
2052 if (sx->verify)
2053 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2054
2055 /* Get the actual port the connection will use, into sx->conn_args.host */
2056
2057 smtp_port_for_connect(sx->conn_args.host, sx->port);
2058
2059 #if !defined(DISABLE_TLS) && defined(SUPPORT_DANE)
2060 /* Do TLSA lookup for DANE */
2061 {
2062 tls_out.dane_verified = FALSE;
2063 tls_out.tlsa_usage = 0;
2064
2065 if (sx->conn_args.host->dnssec == DS_YES)
2066 {
2067 if( sx->dane_required
2068 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2069 )
2070 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2071 {
2072 case OK: sx->conn_args.dane = TRUE;
2073 ob->tls_tempfail_tryclear = FALSE;
2074 break;
2075 case FAIL_FORCED: break;
2076 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2077 string_sprintf("DANE error: tlsa lookup %s",
2078 rc_to_string(rc)),
2079 rc, FALSE);
2080 # ifndef DISABLE_EVENT
2081 (void) event_raise(sx->conn_args.tblock->event_action,
2082 US"dane:fail", sx->dane_required
2083 ? US"dane-required" : US"dnssec-invalid");
2084 # endif
2085 return rc;
2086 }
2087 }
2088 else if (sx->dane_required)
2089 {
2090 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2091 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2092 FAIL, FALSE);
2093 # ifndef DISABLE_EVENT
2094 (void) event_raise(sx->conn_args.tblock->event_action,
2095 US"dane:fail", US"dane-required");
2096 # endif
2097 return FAIL;
2098 }
2099 }
2100 #endif /*DANE*/
2101
2102 /* Make the TCP connection */
2103
2104 sx->cctx.tls_ctx = NULL;
2105 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2106 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2107
2108 #ifdef EXPERIMENTAL_PIPE_CONNECT
2109 if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK)
2110 {
2111 sx->early_pipe_ok = TRUE;
2112 if ( read_ehlo_cache_entry(sx)
2113 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2114 {
2115 DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2116 sx->early_pipe_active = TRUE;
2117 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2118 }
2119 }
2120
2121 if (sx->early_pipe_active)
2122 sx->outblock.conn_args = &sx->conn_args;
2123 else
2124 #endif
2125 {
2126 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2127 {
2128 uschar * msg = NULL;
2129 if (sx->verify)
2130 {
2131 msg = US strerror(errno);
2132 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
2133 }
2134 set_errno_nohost(sx->addrlist,
2135 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2136 sx->verify ? string_sprintf("could not connect: %s", msg)
2137 : NULL,
2138 DEFER, FALSE);
2139 sx->send_quit = FALSE;
2140 return DEFER;
2141 }
2142 }
2143 /* Expand the greeting message while waiting for the initial response. (Makes
2144 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2145 delayed till here so that $sending_interface and $sending_port are set. */
2146 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2147 will be? Somehow I doubt it. */
2148
2149 if (sx->helo_data)
2150 if (!(sx->helo_data = expand_string(sx->helo_data)))
2151 if (sx->verify)
2152 log_write(0, LOG_MAIN|LOG_PANIC,
2153 "<%s>: failed to expand transport's helo_data value for callout: %s",
2154 sx->addrlist->address, expand_string_message);
2155
2156 #ifdef SUPPORT_I18N
2157 if (sx->helo_data)
2158 {
2159 expand_string_message = NULL;
2160 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2161 &expand_string_message)),
2162 expand_string_message)
2163 if (sx->verify)
2164 log_write(0, LOG_MAIN|LOG_PANIC,
2165 "<%s>: failed to expand transport's helo_data value for callout: %s",
2166 sx->addrlist->address, expand_string_message);
2167 else
2168 sx->helo_data = NULL;
2169 }
2170 #endif
2171
2172 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2173 is nevertheless a reasonably clean way of programming this kind of logic,
2174 where you want to escape on any error. */
2175
2176 if (!sx->smtps)
2177 {
2178 #ifdef EXPERIMENTAL_PIPE_CONNECT
2179 if (sx->early_pipe_active)
2180 {
2181 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2182 sx->outblock.cmd_count = 1;
2183 }
2184 else
2185 #endif
2186 {
2187 #ifdef TCP_QUICKACK
2188 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2189 sizeof(off));
2190 #endif
2191 if (!smtp_reap_banner(sx))
2192 goto RESPONSE_FAILED;
2193 }
2194
2195 #ifndef DISABLE_EVENT
2196 {
2197 uschar * s;
2198 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2199 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2200 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2201 if (s)
2202 {
2203 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2204 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2205 DEFER, FALSE);
2206 yield = DEFER;
2207 goto SEND_QUIT;
2208 }
2209 }
2210 #endif
2211
2212 /* Now check if the helo_data expansion went well, and sign off cleanly if
2213 it didn't. */
2214
2215 if (!sx->helo_data)
2216 {
2217 message = string_sprintf("failed to expand helo_data: %s",
2218 expand_string_message);
2219 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2220 yield = DEFER;
2221 goto SEND_QUIT;
2222 }
2223 }
2224
2225 /** Debugging without sending a message
2226 sx->addrlist->transport_return = DEFER;
2227 goto SEND_QUIT;
2228 **/
2229
2230 /* Errors that occur after this point follow an SMTP command, which is
2231 left in big_buffer by smtp_write_command() for use in error messages. */
2232
2233 smtp_command = big_buffer;
2234
2235 /* Tell the remote who we are...
2236
2237 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2238 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2239 greeting is of this form. The assumption was that the far end supports it
2240 properly... but experience shows that there are some that give 5xx responses,
2241 even though the banner includes "ESMTP" (there's a bloody-minded one that
2242 says "ESMTP not spoken here"). Cope with that case.
2243
2244 September 2000: Time has passed, and it seems reasonable now to always send
2245 EHLO at the start. It is also convenient to make the change while installing
2246 the TLS stuff.
2247
2248 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2249 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2250 would be no way to send out the mails, so there is now a host list
2251 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2252 PIPELINING problem as well. Maybe it can also be useful to cure other
2253 problems with broken servers.
2254
2255 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2256 Then somebody tried it with a Microsoft mailer... It seems that all other
2257 mailers use upper case for some reason (the RFC is quite clear about case
2258 independence) so, for peace of mind, I gave in. */
2259
2260 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2261
2262 /* Alas; be careful, since this goto is not an error-out, so conceivably
2263 we might set data between here and the target which we assume to exist
2264 and be usable. I can see this coming back to bite us. */
2265 #ifndef DISABLE_TLS
2266 if (sx->smtps)
2267 {
2268 smtp_peer_options |= OPTION_TLS;
2269 suppress_tls = FALSE;
2270 ob->tls_tempfail_tryclear = FALSE;
2271 smtp_command = US"SSL-on-connect";
2272 goto TLS_NEGOTIATE;
2273 }
2274 #endif
2275
2276 if (sx->esmtp)
2277 {
2278 if (smtp_write_command(sx,
2279 #ifdef EXPERIMENTAL_PIPE_CONNECT
2280 sx->early_pipe_active ? SCMD_BUFFER :
2281 #endif
2282 SCMD_FLUSH,
2283 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2284 goto SEND_FAILED;
2285 sx->esmtp_sent = TRUE;
2286
2287 #ifdef EXPERIMENTAL_PIPE_CONNECT
2288 if (sx->early_pipe_active)
2289 {
2290 sx->pending_EHLO = TRUE;
2291
2292 /* If we have too many authenticators to handle and might need to AUTH
2293 for this transport, pipeline no further as we will need the
2294 list of auth methods offered. Reap the banner and EHLO. */
2295
2296 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2297 && f.smtp_in_early_pipe_no_auth)
2298 {
2299 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2300 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2301 goto SEND_FAILED;
2302 if (sync_responses(sx, 2, 0) != 0)
2303 {
2304 HDEBUG(D_transport)
2305 debug_printf("failed reaping pipelined cmd responses\n");
2306 goto RESPONSE_FAILED;
2307 }
2308 sx->early_pipe_active = FALSE;
2309 }
2310 }
2311 else
2312 #endif
2313 if (!smtp_reap_ehlo(sx))
2314 goto RESPONSE_FAILED;
2315 }
2316 else
2317 DEBUG(D_transport)
2318 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2319
2320 #ifdef EXPERIMENTAL_PIPE_CONNECT
2321 if (!sx->early_pipe_active)
2322 #endif
2323 if (!sx->esmtp)
2324 {
2325 BOOL good_response;
2326 int n = sizeof(sx->buffer);
2327 uschar * rsp = sx->buffer;
2328
2329 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2330 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2331
2332 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2333 goto SEND_FAILED;
2334 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2335 #ifdef EXPERIMENTAL_DSN_INFO
2336 sx->helo_response = string_copy(rsp);
2337 #endif
2338 if (!good_response)
2339 {
2340 /* Handle special logging for a closed connection after HELO
2341 when had previously sent EHLO */
2342
2343 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2344 {
2345 errno = ERRNO_SMTPCLOSED;
2346 goto EHLOHELO_FAILED;
2347 }
2348 memmove(sx->buffer, rsp, Ustrlen(rsp));
2349 goto RESPONSE_FAILED;
2350 }
2351 }
2352
2353 if (sx->esmtp || sx->lmtp)
2354 {
2355 #ifdef EXPERIMENTAL_PIPE_CONNECT
2356 if (!sx->early_pipe_active)
2357 #endif
2358 {
2359 sx->peer_offered = ehlo_response(sx->buffer,
2360 OPTION_TLS /* others checked later */
2361 #ifdef EXPERIMENTAL_PIPE_CONNECT
2362 | (sx->early_pipe_ok
2363 ? OPTION_IGNQ
2364 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2365 #ifdef SUPPORT_I18N
2366 | OPTION_UTF8
2367 #endif
2368 | OPTION_EARLY_PIPE
2369 : 0
2370 )
2371 #endif
2372 );
2373 #ifdef EXPERIMENTAL_PIPE_CONNECT
2374 if (sx->early_pipe_ok)
2375 {
2376 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2377
2378 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2379 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2380 {
2381 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2382 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2383 write_ehlo_cache_entry(sx);
2384 }
2385 }
2386 #endif
2387 }
2388
2389 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2390
2391 #ifndef DISABLE_TLS
2392 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2393 #endif
2394 }
2395 }
2396
2397 /* For continuing deliveries down the same channel, having re-exec'd the socket
2398 is the standard input; for a socket held open from verify it is recorded
2399 in the cutthrough context block. Either way we don't need to redo EHLO here
2400 (but may need to do so for TLS - see below).
2401 Set up the pointer to where subsequent commands will be left, for
2402 error messages. Note that smtp_peer_options will have been
2403 set from the command line if they were set in the process that passed the
2404 connection on. */
2405
2406 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2407 as the continue goes via transport_pass_socket() and doublefork and exec.
2408 It does not wait. Unclear how we keep separate host's responses
2409 separate - we could match up by host ip+port as a bodge. */
2410
2411 else
2412 {
2413 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2414 {
2415 sx->cctx = cutthrough.cctx;
2416 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2417 }
2418 else
2419 {
2420 sx->cctx.sock = 0; /* stdin */
2421 sx->cctx.tls_ctx = NULL;
2422 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2423 }
2424 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2425 smtp_command = big_buffer;
2426 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2427
2428 /* For a continued connection with TLS being proxied for us, or a
2429 held-open verify connection with TLS, nothing more to do. */
2430
2431 if ( continue_proxy_cipher
2432 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2433 && cutthrough.is_tls)
2434 )
2435 {
2436 sx->peer_offered = smtp_peer_options;
2437 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2438 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2439 continue_proxy_cipher ? "proxied" : "verify conn with");
2440 return OK;
2441 }
2442 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2443 }
2444
2445 /* If TLS is available on this connection, whether continued or not, attempt to
2446 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2447 send another EHLO - the server may give a different answer in secure mode. We
2448 use a separate buffer for reading the response to STARTTLS so that if it is
2449 negative, the original EHLO data is available for subsequent analysis, should
2450 the client not be required to use TLS. If the response is bad, copy the buffer
2451 for error analysis. */
2452
2453 #ifndef DISABLE_TLS
2454 if ( smtp_peer_options & OPTION_TLS
2455 && !suppress_tls
2456 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2457 && ( !sx->verify
2458 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2459 ) )
2460 {
2461 uschar buffer2[4096];
2462
2463 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2464 goto SEND_FAILED;
2465
2466 #ifdef EXPERIMENTAL_PIPE_CONNECT
2467 /* If doing early-pipelining reap the banner and EHLO-response but leave
2468 the response for the STARTTLS we just sent alone. */
2469
2470 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2471 {
2472 HDEBUG(D_transport)
2473 debug_printf("failed reaping pipelined cmd responses\n");
2474 goto RESPONSE_FAILED;
2475 }
2476 #endif
2477
2478 /* If there is an I/O error, transmission of this message is deferred. If
2479 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2480 false, we also defer. However, if there is a temporary rejection of STARTTLS
2481 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2482 STARTTLS, we carry on. This means we will try to send the message in clear,
2483 unless the host is in hosts_require_tls (tested below). */
2484
2485 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2486 {
2487 if ( errno != 0
2488 || buffer2[0] == 0
2489 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2490 )
2491 {
2492 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2493 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2494 goto RESPONSE_FAILED;
2495 }
2496 }
2497
2498 /* STARTTLS accepted: try to negotiate a TLS session. */
2499
2500 else
2501 TLS_NEGOTIATE:
2502 {
2503 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2504 {
2505 /* TLS negotiation failed; give an error. From outside, this function may
2506 be called again to try in clear on a new connection, if the options permit
2507 it for this host. */
2508 #ifdef USE_GNUTLS
2509 GNUTLS_CONN_FAILED:
2510 #endif
2511 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2512
2513 # ifdef SUPPORT_DANE
2514 if (sx->conn_args.dane)
2515 {
2516 log_write(0, LOG_MAIN,
2517 "DANE attempt failed; TLS connection to %s [%s]: %s",
2518 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2519 # ifndef DISABLE_EVENT
2520 (void) event_raise(sx->conn_args.tblock->event_action,
2521 US"dane:fail", US"validation-failure"); /* could do with better detail */
2522 # endif
2523 }
2524 # endif
2525
2526 errno = ERRNO_TLSFAILURE;
2527 message = string_sprintf("TLS session: %s", tls_errstr);
2528 sx->send_quit = FALSE;
2529 goto TLS_FAILED;
2530 }
2531
2532 /* TLS session is set up */
2533
2534 smtp_peer_options_wrap = smtp_peer_options;
2535 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2536 if (addr->transport_return == PENDING_DEFER)
2537 {
2538 addr->cipher = tls_out.cipher;
2539 addr->ourcert = tls_out.ourcert;
2540 addr->peercert = tls_out.peercert;
2541 addr->peerdn = tls_out.peerdn;
2542 addr->ocsp = tls_out.ocsp;
2543 }
2544 }
2545 }
2546
2547 /* if smtps, we'll have smtp_command set to something else; always safe to
2548 reset it here. */
2549 smtp_command = big_buffer;
2550
2551 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2552 helo_data is null, we are dealing with a connection that was passed from
2553 another process, and so we won't have expanded helo_data above. We have to
2554 expand it here. $sending_ip_address and $sending_port are set up right at the
2555 start of the Exim process (in exim.c). */
2556
2557 if (tls_out.active.sock >= 0)
2558 {
2559 uschar * greeting_cmd;
2560
2561 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2562 {
2563 uschar *message = string_sprintf("failed to expand helo_data: %s",
2564 expand_string_message);
2565 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2566 yield = DEFER;
2567 goto SEND_QUIT;
2568 }
2569
2570 #ifdef EXPERIMENTAL_PIPE_CONNECT
2571 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2572 We're unlikely to get the group sent and delivered before the server sends its
2573 banner, but it's still worth sending as a group.
2574 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2575 the reverse. */
2576
2577 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2578 {
2579 sx->peer_offered = sx->ehlo_resp.crypted_features;
2580 if ((sx->early_pipe_active =
2581 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2582 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2583 }
2584 #endif
2585
2586 /* For SMTPS we need to wait for the initial OK response. */
2587 if (sx->smtps)
2588 #ifdef EXPERIMENTAL_PIPE_CONNECT
2589 if (sx->early_pipe_active)
2590 {
2591 sx->pending_BANNER = TRUE;
2592 sx->outblock.cmd_count = 1;
2593 }
2594 else
2595 #endif
2596 if (!smtp_reap_banner(sx))
2597 goto RESPONSE_FAILED;
2598
2599 if (sx->lmtp)
2600 greeting_cmd = US"LHLO";
2601 else if (sx->esmtp)
2602 greeting_cmd = US"EHLO";
2603 else
2604 {
2605 greeting_cmd = US"HELO";
2606 DEBUG(D_transport)
2607 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2608 }
2609
2610 if (smtp_write_command(sx,
2611 #ifdef EXPERIMENTAL_PIPE_CONNECT
2612 sx->early_pipe_active ? SCMD_BUFFER :
2613 #endif
2614 SCMD_FLUSH,
2615 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2616 goto SEND_FAILED;
2617
2618 #ifdef EXPERIMENTAL_PIPE_CONNECT
2619 if (sx->early_pipe_active)
2620 sx->pending_EHLO = TRUE;
2621 else
2622 #endif
2623 {
2624 if (!smtp_reap_ehlo(sx))
2625 #ifdef USE_GNUTLS
2626 {
2627 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2628 cert late, under TLS1.3 - which means here; the first time we try to
2629 receive crypted data. Treat it as if it was a connect-time failure.
2630 See also the early-pipe equivalent... which will be hard; every call
2631 to sync_responses will need to check the result.
2632 It would be nicer to have GnuTLS check the cert during the handshake.
2633 Can it do that, with all the flexibility we need? */
2634
2635 tls_errstr = US"error on first read";
2636 goto GNUTLS_CONN_FAILED;
2637 }
2638 #else
2639 goto RESPONSE_FAILED;
2640 #endif
2641 smtp_peer_options = 0;
2642 }
2643 }
2644
2645 /* If the host is required to use a secure channel, ensure that we
2646 have one. */
2647
2648 else if ( sx->smtps
2649 # ifdef SUPPORT_DANE
2650 || sx->conn_args.dane
2651 # endif
2652 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2653 )
2654 {
2655 errno = ERRNO_TLSREQUIRED;
2656 message = string_sprintf("a TLS session is required, but %s",
2657 smtp_peer_options & OPTION_TLS
2658 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2659 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2660 if (sx->conn_args.dane)
2661 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2662 smtp_peer_options & OPTION_TLS
2663 ? US"validation-failure" /* could do with better detail */
2664 : US"starttls-not-supported");
2665 # endif
2666 goto TLS_FAILED;
2667 }
2668 #endif /*DISABLE_TLS*/
2669
2670 /* If TLS is active, we have just started it up and re-done the EHLO command,
2671 so its response needs to be analyzed. If TLS is not active and this is a
2672 continued session down a previously-used socket, we haven't just done EHLO, so
2673 we skip this. */
2674
2675 if (continue_hostname == NULL
2676 #ifndef DISABLE_TLS
2677 || tls_out.active.sock >= 0
2678 #endif
2679 )
2680 {
2681 if (sx->esmtp || sx->lmtp)
2682 {
2683 #ifdef EXPERIMENTAL_PIPE_CONNECT
2684 if (!sx->early_pipe_active)
2685 #endif
2686 {
2687 sx->peer_offered = ehlo_response(sx->buffer,
2688 0 /* no TLS */
2689 #ifdef EXPERIMENTAL_PIPE_CONNECT
2690 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2691 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2692 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2693 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2694
2695 #else
2696
2697 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2698 | OPTION_CHUNKING
2699 | OPTION_PRDR
2700 # ifdef SUPPORT_I18N
2701 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2702 /*XXX if we hand peercaps on to continued-conn processes,
2703 must not depend on this addr */
2704 # endif
2705 | OPTION_DSN
2706 | OPTION_PIPE
2707 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2708 #endif
2709 );
2710 #ifdef EXPERIMENTAL_PIPE_CONNECT
2711 if (tls_out.active.sock >= 0)
2712 sx->ehlo_resp.crypted_features = sx->peer_offered;
2713 #endif
2714 }
2715
2716 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2717 lmtp_ignore_quota option was set. */
2718
2719 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2720
2721 /* If the response to EHLO specified support for the SIZE parameter, note
2722 this, provided size_addition is non-negative. */
2723
2724 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2725
2726 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2727 the current host, esmtp will be false, so PIPELINING can never be used. If
2728 the current host matches hosts_avoid_pipelining, don't do it. */
2729
2730 if ( sx->peer_offered & OPTION_PIPE
2731 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2732 smtp_peer_options |= OPTION_PIPE;
2733
2734 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2735 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2736
2737 if ( sx->peer_offered & OPTION_CHUNKING
2738 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2739 sx->peer_offered &= ~OPTION_CHUNKING;
2740
2741 if (sx->peer_offered & OPTION_CHUNKING)
2742 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2743
2744 #ifndef DISABLE_PRDR
2745 if ( sx->peer_offered & OPTION_PRDR
2746 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2747 sx->peer_offered &= ~OPTION_PRDR;
2748
2749 if (sx->peer_offered & OPTION_PRDR)
2750 DEBUG(D_transport) debug_printf("PRDR usable\n");
2751 #endif
2752
2753 /* Note if the server supports DSN */
2754 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2755 DEBUG(D_transport) debug_printf("%susing DSN\n",
2756 sx->peer_offered & OPTION_DSN ? "" : "not ");
2757
2758 #ifdef EXPERIMENTAL_PIPE_CONNECT
2759 if ( sx->early_pipe_ok
2760 && !sx->early_pipe_active
2761 && tls_out.active.sock >= 0
2762 && smtp_peer_options & OPTION_PIPE
2763 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2764 & OPTION_EARLY_PIPE)
2765 {
2766 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2767 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2768 write_ehlo_cache_entry(sx);
2769 }
2770 #endif
2771
2772 /* Note if the response to EHLO specifies support for the AUTH extension.
2773 If it has, check that this host is one we want to authenticate to, and do
2774 the business. The host name and address must be available when the
2775 authenticator's client driver is running. */
2776
2777 switch (yield = smtp_auth(sx))
2778 {
2779 default: goto SEND_QUIT;
2780 case OK: break;
2781 case FAIL_SEND: goto SEND_FAILED;
2782 case FAIL: goto RESPONSE_FAILED;
2783 }
2784 }
2785 }
2786 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2787
2788 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2789 message-specific. */
2790
2791 sx->setting_up = FALSE;
2792
2793 #ifdef SUPPORT_I18N
2794 if (sx->addrlist->prop.utf8_msg)
2795 {
2796 uschar * s;
2797
2798 /* If the transport sets a downconversion mode it overrides any set by ACL
2799 for the message. */
2800
2801 if ((s = ob->utf8_downconvert))
2802 {
2803 if (!(s = expand_string(s)))
2804 {
2805 message = string_sprintf("failed to expand utf8_downconvert: %s",
2806 expand_string_message);
2807 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2808 yield = DEFER;
2809 goto SEND_QUIT;
2810 }
2811 switch (*s)
2812 {
2813 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2814 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2815 break;
2816 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2817 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2818 break;
2819 case '-': if (s[1] == '1')
2820 {
2821 sx->addrlist->prop.utf8_downcvt = FALSE;
2822 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2823 }
2824 break;
2825 }
2826 }
2827
2828 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2829 && !sx->addrlist->prop.utf8_downcvt_maybe;
2830 DEBUG(D_transport) if (!sx->utf8_needed)
2831 debug_printf("utf8: %s downconvert\n",
2832 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2833 }
2834
2835 /* If this is an international message we need the host to speak SMTPUTF8 */
2836 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2837 {
2838 errno = ERRNO_UTF8_FWD;
2839 goto RESPONSE_FAILED;
2840 }
2841 #endif /*SUPPORT_I18N*/
2842
2843 return OK;
2844
2845
2846 {
2847 int code;
2848
2849 RESPONSE_FAILED:
2850 message = NULL;
2851 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2852 sx->buffer, &code, &message, &pass_message);
2853 yield = DEFER;
2854 goto FAILED;
2855
2856 SEND_FAILED:
2857 code = '4';
2858 message = US string_sprintf("send() to %s [%s] failed: %s",
2859 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2860 sx->send_quit = FALSE;
2861 yield = DEFER;
2862 goto FAILED;
2863
2864 EHLOHELO_FAILED:
2865 code = '4';
2866 message = string_sprintf("Remote host closed connection in response to %s"
2867 " (EHLO response was: %s)", smtp_command, sx->buffer);
2868 sx->send_quit = FALSE;
2869 yield = DEFER;
2870 goto FAILED;
2871
2872 /* This label is jumped to directly when a TLS negotiation has failed,
2873 or was not done for a host for which it is required. Values will be set
2874 in message and errno, and setting_up will always be true. Treat as
2875 a temporary error. */
2876
2877 #ifndef DISABLE_TLS
2878 TLS_FAILED:
2879 code = '4', yield = DEFER;
2880 goto FAILED;
2881 #endif
2882
2883 /* The failure happened while setting up the call; see if the failure was
2884 a 5xx response (this will either be on connection, or following HELO - a 5xx
2885 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2886 fail all addresses, as this host is never going to accept them. For other
2887 errors during setting up (timeouts or whatever), defer all addresses, and
2888 yield DEFER, so that the host is not tried again for a while.
2889
2890 XXX This peeking for another host feels like a layering violation. We want
2891 to note the host as unusable, but down here we shouldn't know if this was
2892 the last host to try for the addr(list). Perhaps the upper layer should be
2893 the one to do set_errno() ? The problem is that currently the addr is where
2894 errno etc. are stashed, but until we run out of hosts to try the errors are
2895 host-specific. Maybe we should enhance the host_item definition? */
2896
2897 FAILED:
2898 sx->ok = FALSE; /* For when reached by GOTO */
2899 set_errno(sx->addrlist, errno, message,
2900 sx->conn_args.host->next
2901 ? DEFER
2902 : code == '5'
2903 #ifdef SUPPORT_I18N
2904 || errno == ERRNO_UTF8_FWD
2905 #endif
2906 ? FAIL : DEFER,
2907 pass_message, sx->conn_args.host
2908 #ifdef EXPERIMENTAL_DSN_INFO
2909 , sx->smtp_greeting, sx->helo_response
2910 #endif
2911 );
2912 }
2913
2914
2915 SEND_QUIT:
2916
2917 if (sx->send_quit)
2918 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2919
2920 #ifndef DISABLE_TLS
2921 if (sx->cctx.tls_ctx)
2922 {
2923 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2924 sx->cctx.tls_ctx = NULL;
2925 }
2926 #endif
2927
2928 /* Close the socket, and return the appropriate value, first setting
2929 works because the NULL setting is passed back to the calling process, and
2930 remote_max_parallel is forced to 1 when delivering over an existing connection,
2931 */
2932
2933 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2934 if (sx->send_quit)
2935 {
2936 shutdown(sx->cctx.sock, SHUT_WR);
2937 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2938 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2939 i--; /* drain socket */
2940 sx->send_quit = FALSE;
2941 }
2942 (void)close(sx->cctx.sock);
2943 sx->cctx.sock = -1;
2944
2945 #ifndef DISABLE_EVENT
2946 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2947 #endif
2948
2949 continue_transport = NULL;
2950 continue_hostname = NULL;
2951 return yield;
2952 }
2953
2954
2955
2956
2957 /* Create the string of options that will be appended to the MAIL FROM:
2958 in the connection context buffer */
2959
2960 static int
2961 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2962 {
2963 uschar * p = sx->buffer;
2964 address_item * addr;
2965 int address_count;
2966
2967 *p = 0;
2968
2969 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2970 send it, adding something to the message size to allow for imprecision
2971 and things that get added en route. Exim keeps the number of lines
2972 in a message, so we can give an accurate value for the original message, but we
2973 need some additional to handle added headers. (Double "." characters don't get
2974 included in the count.) */
2975
2976 if ( message_size > 0
2977 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2978 {
2979 /*XXX problem here under spool_files_wireformat?
2980 Or just forget about lines? Or inflate by a fixed proportion? */
2981
2982 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2983 while (*p) p++;
2984 }
2985
2986 #ifndef DISABLE_PRDR
2987 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2988 request that */
2989
2990 sx->prdr_active = FALSE;
2991 if (sx->peer_offered & OPTION_PRDR)
2992 for (address_item * addr = addrlist; addr; addr = addr->next)
2993 if (addr->transport_return == PENDING_DEFER)
2994 {
2995 for (addr = addr->next; addr; addr = addr->next)
2996 if (addr->transport_return == PENDING_DEFER)
2997 { /* at least two recipients to send */
2998 sx->prdr_active = TRUE;
2999 sprintf(CS p, " PRDR"); p += 5;
3000 break;
3001 }
3002 break;
3003 }
3004 #endif
3005
3006 #ifdef SUPPORT_I18N
3007 /* If it supports internationalised messages, and this meesage need that,
3008 request it */
3009
3010 if ( sx->peer_offered & OPTION_UTF8
3011 && addrlist->prop.utf8_msg
3012 && !addrlist->prop.utf8_downcvt
3013 )
3014 Ustrcpy(p, " SMTPUTF8"), p += 9;
3015 #endif
3016
3017 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3018 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3019 addr && address_count < sx->max_rcpt;
3020 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3021 {
3022 address_count++;
3023 if (!(addr->dsn_flags & rf_dsnlasthop))
3024 {
3025 sx->dsn_all_lasthop = FALSE;
3026 break;
3027 }
3028 }
3029
3030 /* Add any DSN flags to the mail command */
3031
3032 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3033 {
3034 if (dsn_ret == dsn_ret_hdrs)
3035 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3036 else if (dsn_ret == dsn_ret_full)
3037 { Ustrcpy(p, " RET=FULL"); p += 9; }
3038
3039 if (dsn_envid)
3040 {
3041 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3042 while (*p) p++;
3043 }
3044 }
3045
3046 /* If an authenticated_sender override has been specified for this transport
3047 instance, expand it. If the expansion is forced to fail, and there was already
3048 an authenticated_sender for this message, the original value will be used.
3049 Other expansion failures are serious. An empty result is ignored, but there is
3050 otherwise no check - this feature is expected to be used with LMTP and other
3051 cases where non-standard addresses (e.g. without domains) might be required. */
3052
3053 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3054 return ERROR;
3055
3056 return OK;
3057 }
3058
3059
3060 static void
3061 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3062 {
3063 uschar * p = sx->buffer;
3064 *p = 0;
3065
3066 /* Add any DSN flags to the rcpt command */
3067
3068 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3069 {
3070 if (addr->dsn_flags & rf_dsnflags)
3071 {
3072 BOOL first = TRUE;
3073
3074 Ustrcpy(p, " NOTIFY=");
3075 while (*p) p++;
3076 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3077 {
3078 if (!first) *p++ = ',';
3079 first = FALSE;
3080 Ustrcpy(p, rf_names[i]);
3081 while (*p) p++;
3082 }
3083 }
3084
3085 if (addr->dsn_orcpt)
3086 {
3087 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3088 addr->dsn_orcpt);
3089 while (*p) p++;
3090 }
3091 }
3092 }
3093
3094
3095
3096 /*
3097 Return:
3098 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3099 -1 MAIL response error
3100 -2 any non-MAIL read i/o error
3101 -3 non-MAIL response timeout
3102 -4 internal error; channel still usable
3103 -5 transmit failed
3104 */
3105
3106 int
3107 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3108 {
3109 address_item * addr;
3110 int address_count;
3111 int rc;
3112
3113 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3114 {
3115 *yield = ERROR;
3116 return -4;
3117 }
3118
3119 /* From here until we send the DATA command, we can make use of PIPELINING
3120 if the server host supports it. The code has to be able to check the responses
3121 at any point, for when the buffer fills up, so we write it totally generally.
3122 When PIPELINING is off, each command written reports that it has flushed the
3123 buffer. */
3124
3125 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3126
3127 {
3128 uschar * s = sx->from_addr;
3129 #ifdef SUPPORT_I18N
3130 uschar * errstr = NULL;
3131
3132 /* If we must downconvert, do the from-address here. Remember we had to
3133 for the to-addresses (done below), and also (ugly) for re-doing when building
3134 the delivery log line. */
3135
3136 if ( sx->addrlist->prop.utf8_msg
3137 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3138 )
3139 {
3140 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3141 {
3142 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3143 *yield = ERROR;
3144 return -4;
3145 }
3146 setflag(sx->addrlist, af_utf8_downcvt);
3147 }
3148 #endif
3149
3150 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3151 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3152 }
3153
3154 mail_command = string_copy(big_buffer); /* Save for later error message */
3155
3156 switch(rc)
3157 {
3158 case -1: /* Transmission error */
3159 return -5;
3160
3161 case +1: /* Cmd was sent */
3162 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3163 (SOB sx->conn_args.ob)->command_timeout))
3164 {
3165 if (errno == 0 && sx->buffer[0] == '4')
3166 {
3167 errno = ERRNO_MAIL4XX;
3168 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3169 }
3170 return -1;
3171 }
3172 sx->pending_MAIL = FALSE;
3173 break;
3174
3175 /* otherwise zero: command queued for pipeline */
3176 }
3177
3178 /* Pass over all the relevant recipient addresses for this host, which are the
3179 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3180 several before we have to read the responses for those seen so far. This
3181 checking is done by a subroutine because it also needs to be done at the end.
3182 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3183 the next one if not all are sent.
3184
3185 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3186 last address because we want to abort if any recipients have any kind of
3187 problem, temporary or permanent. We know that all recipient addresses will have
3188 the PENDING_DEFER status, because only one attempt is ever made, and we know
3189 that max_rcpt will be large, so all addresses will be done at once.
3190
3191 For verify we flush the pipeline after any (the only) rcpt address. */
3192
3193 for (addr = sx->first_addr, address_count = 0;
3194 addr && address_count < sx->max_rcpt;
3195 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3196 {
3197 int count;
3198 BOOL no_flush;
3199 uschar * rcpt_addr;
3200
3201 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3202 ? dsn_support_yes : dsn_support_no;
3203
3204 address_count++;
3205 no_flush = pipelining_active && !sx->verify
3206 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3207
3208 build_rcptcmd_options(sx, addr);
3209
3210 /* Now send the RCPT command, and process outstanding responses when
3211 necessary. After a timeout on RCPT, we just end the function, leaving the
3212 yield as OK, because this error can often mean that there is a problem with
3213 just one address, so we don't want to delay the host. */
3214
3215 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3216
3217 #ifdef SUPPORT_I18N
3218 if ( testflag(sx->addrlist, af_utf8_downcvt)
3219 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3220 )
3221 {
3222 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3223 errno = ERRNO_EXPANDFAIL;
3224 return -5; /*XXX too harsh? */
3225 }
3226 #endif
3227
3228 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3229 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3230
3231 if (count < 0) return -5;
3232 if (count > 0)
3233 {
3234 switch(sync_responses(sx, count, 0))
3235 {
3236 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3237 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3238 break;
3239
3240 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3241 if (!sx->lmtp) /* can't tell about progress yet */
3242 sx->completed_addr = TRUE;
3243 case 0: /* No 2xx or 5xx, but no probs */
3244 break;
3245
3246 case -1: return -3; /* Timeout on RCPT */
3247 case -2: return -2; /* non-MAIL read i/o error */
3248 default: return -1; /* any MAIL error */
3249
3250 #ifdef EXPERIMENTAL_PIPE_CONNECT
3251 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3252 case -5: return -1; /* TLS first-read error */
3253 #endif
3254 }
3255 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3256 }
3257 } /* Loop for next address */
3258
3259 sx->next_addr = addr;
3260 return 0;
3261 }
3262
3263
3264 #ifndef DISABLE_TLS
3265 /*****************************************************
3266 * Proxy TLS connection for another transport process *
3267 ******************************************************/
3268 /*
3269 Close the unused end of the pipe, fork once more, then use the given buffer
3270 as a staging area, and select on both the given fd and the TLS'd client-fd for
3271 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3272 Do blocking full-size writes, and reads under a timeout. Once both input
3273 channels are closed, exit the process.
3274
3275 Arguments:
3276 ct_ctx tls context
3277 buf space to use for buffering
3278 bufsiz size of buffer
3279 pfd pipe filedescriptor array; [0] is comms to proxied process
3280 timeout per-read timeout, seconds