Copyright updates:
[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 /* Copyright (c) The Exim Maintainers 2020 */
7 /* See the file NOTICE for conditions of use and distribution. */
8
9 #include "../exim.h"
10 #include "smtp.h"
11
12 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
13 # error TLS is required for DANE
14 #endif
15
16
17 /* Options specific to the smtp transport. This transport also supports LMTP
18 over TCP/IP. The options must be in alphabetic order (note that "_" comes
19 before the lower case letters). Some live in the transport_instance block so as
20 to be publicly visible; these are flagged with opt_public. */
21
22 #define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
23
24 optionlist smtp_transport_options[] = {
25 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
26 OPT_OFF(transport_instance, expand_multi_domain) },
27 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
28 LOFF(expand_retry_include_ip_address) },
29
30 { "address_retry_include_sender", opt_bool,
31 LOFF(address_retry_include_sender) },
32 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
33 #ifdef EXPERIMENTAL_ARC
34 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
35 #endif
36 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
37 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
38 { "command_timeout", opt_time, LOFF(command_timeout) },
39 { "connect_timeout", opt_time, LOFF(connect_timeout) },
40 { "connection_max_messages", opt_int | opt_public,
41 OPT_OFF(transport_instance, connection_max_messages) },
42 # ifdef SUPPORT_DANE
43 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
44 # endif
45 { "data_timeout", opt_time, LOFF(data_timeout) },
46 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
47 #ifndef DISABLE_DKIM
48 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
49 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
50 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
51 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
52 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
53 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
55 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
56 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
57 #endif
58 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
59 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
60 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
62 { "dscp", opt_stringptr, LOFF(dscp) },
63 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
64 { "final_timeout", opt_time, LOFF(final_timeout) },
65 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
66 { "helo_data", opt_stringptr, LOFF(helo_data) },
67 { "hosts", opt_stringptr, LOFF(hosts) },
68 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
69 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
70 #ifndef DISABLE_TLS
71 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
72 #endif
73 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
74 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
75 #ifndef DISABLE_TLS
76 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
77 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
78 #endif
79 { "hosts_override", opt_bool, LOFF(hosts_override) },
80 #ifndef DISABLE_PIPE_CONNECT
81 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
82 #endif
83 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
84 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
85 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
86 #endif
87 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
88 #ifndef DISABLE_TLS
89 # ifdef SUPPORT_DANE
90 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
91 # endif
92 # ifndef DISABLE_OCSP
93 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
94 # endif
95 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
96 #endif
97 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
98 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
99 #ifdef SUPPORT_DANE
100 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
101 #endif
102 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
103 #ifndef DISABLE_PRDR
104 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
105 #endif
106 #ifndef DISABLE_TLS
107 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
108 #endif
109 { "interface", opt_stringptr, LOFF(interface) },
110 { "keepalive", opt_bool, LOFF(keepalive) },
111 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
112 { "max_rcpt", opt_int | opt_public,
113 OPT_OFF(transport_instance, max_addresses) },
114 { "multi_domain", opt_expand_bool | opt_public,
115 OPT_OFF(transport_instance, multi_domain) },
116 { "port", opt_stringptr, LOFF(port) },
117 { "protocol", opt_stringptr, LOFF(protocol) },
118 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
119 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
120 { "size_addition", opt_int, LOFF(size_addition) },
121 #ifdef SUPPORT_SOCKS
122 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
123 #endif
124 #ifndef DISABLE_TLS
125 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
126 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
127 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
128 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
129 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
130 # ifdef EXPERIMENTAL_TLS_RESUME
131 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
132 # endif
133 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
134 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
135 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
136 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
137 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
138 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
139 #endif
140 #ifdef SUPPORT_I18N
141 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
142 #endif
143 };
144
145 /* Size of the options list. An extern variable has to be used so that its
146 address can appear in the tables drtables.c. */
147
148 int smtp_transport_options_count = nelem(smtp_transport_options);
149
150
151 #ifdef MACRO_PREDEF
152
153 /* Dummy values */
154 smtp_transport_options_block smtp_transport_option_defaults = {0};
155 void smtp_transport_init(transport_instance *tblock) {}
156 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
157 void smtp_transport_closedown(transport_instance *tblock) {}
158
159 #else /*!MACRO_PREDEF*/
160
161
162 /* Default private options block for the smtp transport. */
163
164 smtp_transport_options_block smtp_transport_option_defaults = {
165 .hosts = NULL,
166 .fallback_hosts = NULL,
167 .hostlist = NULL,
168 .fallback_hostlist = NULL,
169 .helo_data = US"$primary_hostname",
170 .interface = NULL,
171 .port = NULL,
172 .protocol = US"smtp",
173 .dscp = NULL,
174 .serialize_hosts = NULL,
175 .hosts_try_auth = NULL,
176 .hosts_require_auth = NULL,
177 .hosts_try_chunking = US"*",
178 #ifdef SUPPORT_DANE
179 .hosts_try_dane = US"*",
180 .hosts_require_dane = NULL,
181 .dane_require_tls_ciphers = NULL,
182 #endif
183 .hosts_try_fastopen = US"*",
184 #ifndef DISABLE_PRDR
185 .hosts_try_prdr = US"*",
186 #endif
187 #ifndef DISABLE_OCSP
188 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
189 .hosts_require_ocsp = NULL,
190 #endif
191 .hosts_require_tls = NULL,
192 .hosts_avoid_tls = NULL,
193 .hosts_verify_avoid_tls = NULL,
194 .hosts_avoid_pipelining = NULL,
195 #ifndef DISABLE_PIPE_CONNECT
196 .hosts_pipe_connect = NULL,
197 #endif
198 .hosts_avoid_esmtp = NULL,
199 #ifndef DISABLE_TLS
200 .hosts_nopass_tls = NULL,
201 .hosts_noproxy_tls = NULL,
202 #endif
203 .command_timeout = 5*60,
204 .connect_timeout = 5*60,
205 .data_timeout = 5*60,
206 .final_timeout = 10*60,
207 .size_addition = 1024,
208 .hosts_max_try = 5,
209 .hosts_max_try_hardlimit = 50,
210 .address_retry_include_sender = TRUE,
211 .allow_localhost = FALSE,
212 .authenticated_sender_force = FALSE,
213 .gethostbyname = FALSE,
214 .dns_qualify_single = TRUE,
215 .dns_search_parents = FALSE,
216 .dnssec = { .request= US"*", .require=NULL },
217 .delay_after_cutoff = TRUE,
218 .hosts_override = FALSE,
219 .hosts_randomize = FALSE,
220 .keepalive = TRUE,
221 .lmtp_ignore_quota = FALSE,
222 .expand_retry_include_ip_address = NULL,
223 .retry_include_ip_address = TRUE,
224 #ifdef SUPPORT_SOCKS
225 .socks_proxy = NULL,
226 #endif
227 #ifndef DISABLE_TLS
228 .tls_certificate = NULL,
229 .tls_crl = NULL,
230 .tls_privatekey = NULL,
231 .tls_require_ciphers = NULL,
232 .tls_sni = NULL,
233 .tls_verify_certificates = US"system",
234 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
235 .tls_tempfail_tryclear = TRUE,
236 # ifdef EXPERIMENTAL_TLS_RESUME
237 .tls_resumption_hosts = NULL,
238 # endif
239 .tls_verify_hosts = NULL,
240 .tls_try_verify_hosts = US"*",
241 .tls_verify_cert_hostnames = US"*",
242 #endif
243 #ifdef SUPPORT_I18N
244 .utf8_downconvert = NULL,
245 #endif
246 #ifndef DISABLE_DKIM
247 .dkim =
248 {.dkim_domain = NULL,
249 .dkim_identity = NULL,
250 .dkim_private_key = NULL,
251 .dkim_selector = NULL,
252 .dkim_canon = NULL,
253 .dkim_sign_headers = NULL,
254 .dkim_strict = NULL,
255 .dkim_hash = US"sha256",
256 .dkim_timestamps = NULL,
257 .dot_stuffed = FALSE,
258 .force_bodyhash = FALSE,
259 # ifdef EXPERIMENTAL_ARC
260 .arc_signspec = NULL,
261 # endif
262 },
263 # ifdef EXPERIMENTAL_ARC
264 .arc_sign = NULL,
265 # endif
266 #endif
267 };
268
269 /* some DSN flags for use later */
270
271 static int rf_list[] = {rf_notify_never, rf_notify_success,
272 rf_notify_failure, rf_notify_delay };
273
274 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
275
276
277
278 /* Local statics */
279
280 static uschar *smtp_command; /* Points to last cmd for error messages */
281 static uschar *mail_command; /* Points to MAIL cmd for error messages */
282 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
283 static BOOL update_waiting; /* TRUE to update the "wait" database */
284
285 /*XXX move to smtp_context */
286 static BOOL pipelining_active; /* current transaction is in pipe mode */
287
288
289 static unsigned ehlo_response(uschar * buf, unsigned checks);
290
291
292 /******************************************************************************/
293
294 void
295 smtp_deliver_init(void)
296 {
297 if (!regex_PIPELINING) regex_PIPELINING =
298 regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE);
299
300 if (!regex_SIZE) regex_SIZE =
301 regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE);
302
303 if (!regex_AUTH) regex_AUTH =
304 regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
305
306 #ifndef DISABLE_TLS
307 if (!regex_STARTTLS) regex_STARTTLS =
308 regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
309 #endif
310
311 if (!regex_CHUNKING) regex_CHUNKING =
312 regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE);
313
314 #ifndef DISABLE_PRDR
315 if (!regex_PRDR) regex_PRDR =
316 regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE);
317 #endif
318
319 #ifdef SUPPORT_I18N
320 if (!regex_UTF8) regex_UTF8 =
321 regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE);
322 #endif
323
324 if (!regex_DSN) regex_DSN =
325 regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE);
326
327 if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA =
328 regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE);
329
330 #ifndef DISABLE_PIPE_CONNECT
331 if (!regex_EARLY_PIPE) regex_EARLY_PIPE =
332 regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE);
333 #endif
334 }
335
336
337 /*************************************************
338 * Setup entry point *
339 *************************************************/
340
341 /* This function is called when the transport is about to be used,
342 but before running it in a sub-process. It is used for two things:
343
344 (1) To set the fallback host list in addresses, when delivering.
345 (2) To pass back the interface, port, protocol, and other options, for use
346 during callout verification.
347
348 Arguments:
349 tblock pointer to the transport instance block
350 addrlist list of addresses about to be transported
351 tf if not NULL, pointer to block in which to return options
352 uid the uid that will be set (not used)
353 gid the gid that will be set (not used)
354 errmsg place for error message (not used)
355
356 Returns: OK always (FAIL, DEFER not used)
357 */
358
359 static int
360 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
361 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
362 {
363 smtp_transport_options_block *ob = SOB tblock->options_block;
364
365 errmsg = errmsg; /* Keep picky compilers happy */
366 uid = uid;
367 gid = gid;
368
369 /* Pass back options if required. This interface is getting very messy. */
370
371 if (tf)
372 {
373 tf->interface = ob->interface;
374 tf->port = ob->port;
375 tf->protocol = ob->protocol;
376 tf->hosts = ob->hosts;
377 tf->hosts_override = ob->hosts_override;
378 tf->hosts_randomize = ob->hosts_randomize;
379 tf->gethostbyname = ob->gethostbyname;
380 tf->qualify_single = ob->dns_qualify_single;
381 tf->search_parents = ob->dns_search_parents;
382 tf->helo_data = ob->helo_data;
383 }
384
385 /* Set the fallback host list for all the addresses that don't have fallback
386 host lists, provided that the local host wasn't present in the original host
387 list. */
388
389 if (!testflag(addrlist, af_local_host_removed))
390 for (; addrlist; addrlist = addrlist->next)
391 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
392
393 return OK;
394 }
395
396
397
398 /*************************************************
399 * Initialization entry point *
400 *************************************************/
401
402 /* Called for each instance, after its options have been read, to
403 enable consistency checks to be done, or anything else that needs
404 to be set up.
405
406 Argument: pointer to the transport instance block
407 Returns: nothing
408 */
409
410 void
411 smtp_transport_init(transport_instance *tblock)
412 {
413 smtp_transport_options_block *ob = SOB tblock->options_block;
414
415 /* Retry_use_local_part defaults FALSE if unset */
416
417 if (tblock->retry_use_local_part == TRUE_UNSET)
418 tblock->retry_use_local_part = FALSE;
419
420 /* Set the default port according to the protocol */
421
422 if (!ob->port)
423 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
424 ? US"lmtp"
425 : strcmpic(ob->protocol, US"smtps") == 0
426 ? US"smtps" : US"smtp";
427
428 /* Set up the setup entry point, to be called before subprocesses for this
429 transport. */
430
431 tblock->setup = smtp_transport_setup;
432
433 /* Complain if any of the timeouts are zero. */
434
435 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
436 ob->final_timeout <= 0)
437 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
438 "command, data, or final timeout value is zero for %s transport",
439 tblock->name);
440
441 /* If hosts_override is set and there are local hosts, set the global
442 flag that stops verify from showing router hosts. */
443
444 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
445
446 /* If there are any fallback hosts listed, build a chain of host items
447 for them, but do not do any lookups at this time. */
448
449 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
450 }
451
452
453
454
455
456 /*************************************************
457 * Set delivery info into all active addresses *
458 *************************************************/
459
460 /* Only addresses whose status is >= PENDING are relevant. A lesser
461 status means that an address is not currently being processed.
462
463 Arguments:
464 addrlist points to a chain of addresses
465 errno_value to put in each address's errno field
466 msg to put in each address's message field
467 rc to put in each address's transport_return field
468 pass_message if TRUE, set the "pass message" flag in the address
469 host if set, mark addrs as having used this host
470 smtp_greeting from peer
471 helo_response from peer
472 start points to timestamp of delivery start
473
474 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
475 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
476 this particular type of timeout.
477
478 Returns: nothing
479 */
480
481 static void
482 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
483 BOOL pass_message, host_item * host,
484 #ifdef EXPERIMENTAL_DSN_INFO
485 const uschar * smtp_greeting, const uschar * helo_response,
486 #endif
487 struct timeval * start
488 )
489 {
490 int orvalue = 0;
491 struct timeval deliver_time;
492
493 if (errno_value == ERRNO_CONNECTTIMEOUT)
494 {
495 errno_value = ETIMEDOUT;
496 orvalue = RTEF_CTOUT;
497 }
498 timesince(&deliver_time, start);
499
500 for (address_item * addr = addrlist; addr; addr = addr->next)
501 if (addr->transport_return >= PENDING)
502 {
503 addr->basic_errno = errno_value;
504 addr->more_errno |= orvalue;
505 addr->delivery_time = deliver_time;
506 if (msg)
507 {
508 addr->message = msg;
509 if (pass_message) setflag(addr, af_pass_message);
510 }
511 addr->transport_return = rc;
512 if (host)
513 {
514 addr->host_used = host;
515 #ifdef EXPERIMENTAL_DSN_INFO
516 if (smtp_greeting)
517 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
518 addr->smtp_greeting = smtp_greeting;
519
520 if (helo_response)
521 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
522 addr->helo_response = helo_response;
523 #endif
524 }
525 }
526 }
527
528 static void
529 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
530 BOOL pass_message, struct timeval * start)
531 {
532 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
533 #ifdef EXPERIMENTAL_DSN_INFO
534 NULL, NULL,
535 #endif
536 start);
537 }
538
539
540 /*************************************************
541 * Check an SMTP response *
542 *************************************************/
543
544 /* This function is given an errno code and the SMTP response buffer
545 to analyse, together with the host identification for generating messages. It
546 sets an appropriate message and puts the first digit of the response code into
547 the yield variable. If no response was actually read, a suitable digit is
548 chosen.
549
550 Arguments:
551 host the current host, to get its name for messages
552 errno_value pointer to the errno value
553 more_errno from the top address for use with ERRNO_FILTER_FAIL
554 buffer the SMTP response buffer
555 yield where to put a one-digit SMTP response code
556 message where to put an error message
557 pass_message set TRUE if message is an SMTP response
558
559 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
560 */
561
562 static BOOL
563 check_response(host_item *host, int *errno_value, int more_errno,
564 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
565 {
566 uschar * pl = pipelining_active ? US"pipelined " : US"";
567 const uschar * s;
568
569 *yield = '4'; /* Default setting is to give a temporary error */
570
571 switch(*errno_value)
572 {
573 case ETIMEDOUT: /* Handle response timeout */
574 *message = US string_sprintf("SMTP timeout after %s%s",
575 pl, smtp_command);
576 if (transport_count > 0)
577 *message = US string_sprintf("%s (%d bytes written)", *message,
578 transport_count);
579 return FALSE;
580
581 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
582 s = string_printing(buffer);
583 while (isspace(*s)) s++;
584 *message = *s == 0
585 ? string_sprintf("Malformed SMTP reply (an empty line) "
586 "in response to %s%s", pl, smtp_command)
587 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
588 pl, smtp_command, s);
589 return FALSE;
590
591 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
592 GnuTLS and TLS1.3 */
593 *message = US"bad first read from TLS conn";
594 return TRUE;
595
596 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
597 can't send QUIT as we mustn't end the DATA. */
598 *message = string_sprintf("transport filter process failed (%d)%s",
599 more_errno,
600 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
601 return FALSE;
602
603 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
604 can't send QUIT as we mustn't end the DATA. */
605 *message =
606 string_sprintf("failed to expand headers_add or headers_remove: %s",
607 expand_string_message);
608 return FALSE;
609
610 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
611 *message = US"failed to write a data block";
612 return FALSE;
613
614 #ifdef SUPPORT_I18N
615 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
616 *message = US"utf8 support required but not offered for forwarding";
617 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
618 return TRUE;
619 #endif
620 }
621
622 /* Handle error responses from the remote mailer. */
623
624 if (buffer[0] != 0)
625 {
626 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
627 "%s", pl, smtp_command, s = string_printing(buffer));
628 *pass_message = TRUE;
629 *yield = buffer[0];
630 return TRUE;
631 }
632
633 /* No data was read. If there is no errno, this must be the EOF (i.e.
634 connection closed) case, which causes deferral. An explicit connection reset
635 error has the same effect. Otherwise, put the host's identity in the message,
636 leaving the errno value to be interpreted as well. In all cases, we have to
637 assume the connection is now dead. */
638
639 if (*errno_value == 0 || *errno_value == ECONNRESET)
640 {
641 *errno_value = ERRNO_SMTPCLOSED;
642 *message = US string_sprintf("Remote host closed connection "
643 "in response to %s%s", pl, smtp_command);
644 }
645 else
646 *message = US string_sprintf("%s [%s]", host->name, host->address);
647
648 return FALSE;
649 }
650
651
652
653 /*************************************************
654 * Write error message to logs *
655 *************************************************/
656
657 /* This writes to the main log and to the message log.
658
659 Arguments:
660 host the current host
661 detail the current message (addr_item->message)
662 basic_errno the errno (addr_item->basic_errno)
663
664 Returns: nothing
665 */
666
667 static void
668 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
669 {
670 gstring * message = LOGGING(outgoing_port)
671 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
672 host->port == PORT_NONE ? 25 : host->port)
673 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
674
675 if (suffix)
676 {
677 message = string_fmt_append(message, ": %s", suffix);
678 if (basic_errno > 0)
679 message = string_fmt_append(message, ": %s", strerror(basic_errno));
680 }
681 else
682 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
683
684 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
685 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
686 }
687
688 static void
689 msglog_line(host_item * host, uschar * message)
690 {
691 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
692 host->name, host->address, message);
693 }
694
695
696
697 #ifndef DISABLE_EVENT
698 /*************************************************
699 * Post-defer action *
700 *************************************************/
701
702 /* This expands an arbitrary per-transport string.
703 It might, for example, be used to write to the database log.
704
705 Arguments:
706 addr the address item containing error information
707 host the current host
708 evstr the event
709
710 Returns: nothing
711 */
712
713 static void
714 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
715 {
716 uschar * action = addr->transport->event_action;
717 const uschar * save_domain;
718 uschar * save_local;
719
720 if (!action)
721 return;
722
723 save_domain = deliver_domain;
724 save_local = deliver_localpart;
725
726 /*XXX would ip & port already be set up? */
727 deliver_host_address = string_copy(host->address);
728 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
729 event_defer_errno = addr->basic_errno;
730
731 router_name = addr->router->name;
732 transport_name = addr->transport->name;
733 deliver_domain = addr->domain;
734 deliver_localpart = addr->local_part;
735
736 (void) event_raise(action, evstr,
737 addr->message
738 ? addr->basic_errno > 0
739 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
740 : string_copy(addr->message)
741 : addr->basic_errno > 0
742 ? string_copy(US strerror(addr->basic_errno))
743 : NULL);
744
745 deliver_localpart = save_local;
746 deliver_domain = save_domain;
747 router_name = transport_name = NULL;
748 }
749 #endif
750
751 /*************************************************
752 * Reap SMTP specific responses *
753 *************************************************/
754 static int
755 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
756 int count)
757 {
758 uschar flushbuffer[4096];
759
760 while (count-- > 0)
761 {
762 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
763 '2', ob->command_timeout)
764 && (errno != 0 || flushbuffer[0] == 0))
765 break;
766 }
767 return count;
768 }
769
770
771 /* Return boolean success */
772
773 static BOOL
774 smtp_reap_banner(smtp_context * sx)
775 {
776 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
777 '2', (SOB sx->conn_args.ob)->command_timeout);
778 #ifdef EXPERIMENTAL_DSN_INFO
779 sx->smtp_greeting = string_copy(sx->buffer);
780 #endif
781 return good_response;
782 }
783
784 static BOOL
785 smtp_reap_ehlo(smtp_context * sx)
786 {
787 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
788 (SOB sx->conn_args.ob)->command_timeout))
789 {
790 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
791 {
792 #ifdef EXPERIMENTAL_DSN_INFO
793 sx->helo_response = string_copy(sx->buffer);
794 #endif
795 return FALSE;
796 }
797 sx->esmtp = FALSE;
798 }
799 #ifdef EXPERIMENTAL_DSN_INFO
800 sx->helo_response = string_copy(sx->buffer);
801 #endif
802 #ifndef DISABLE_EVENT
803 (void) event_raise(sx->conn_args.tblock->event_action,
804 US"smtp:ehlo", sx->buffer);
805 #endif
806 return TRUE;
807 }
808
809
810
811 #ifndef DISABLE_PIPE_CONNECT
812 static uschar *
813 ehlo_cache_key(const smtp_context * sx)
814 {
815 host_item * host = sx->conn_args.host;
816 return Ustrchr(host->address, ':')
817 ? string_sprintf("[%s]:%d.EHLO", host->address,
818 host->port == PORT_NONE ? sx->port : host->port)
819 : string_sprintf("%s:%d.EHLO", host->address,
820 host->port == PORT_NONE ? sx->port : host->port);
821 }
822
823 static void
824 write_ehlo_cache_entry(const smtp_context * sx)
825 {
826 open_db dbblock, * dbm_file;
827
828 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
829 {
830 uschar * ehlo_resp_key = ehlo_cache_key(sx);
831 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
832
833 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
834 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
835 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
836
837 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
838 dbfn_close(dbm_file);
839 }
840 }
841
842 static void
843 invalidate_ehlo_cache_entry(smtp_context * sx)
844 {
845 open_db dbblock, * dbm_file;
846
847 if ( sx->early_pipe_active
848 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
849 {
850 uschar * ehlo_resp_key = ehlo_cache_key(sx);
851 dbfn_delete(dbm_file, ehlo_resp_key);
852 dbfn_close(dbm_file);
853 }
854 }
855
856 static BOOL
857 read_ehlo_cache_entry(smtp_context * sx)
858 {
859 open_db dbblock;
860 open_db * dbm_file;
861
862 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
863 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
864 else
865 {
866 uschar * ehlo_resp_key = ehlo_cache_key(sx);
867 dbdata_ehlo_resp * er;
868
869 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
870 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
871 else if (time(NULL) - er->time_stamp > retry_data_expire)
872 {
873 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
874 dbfn_close(dbm_file);
875 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
876 dbfn_delete(dbm_file, ehlo_resp_key);
877 }
878 else
879 {
880 sx->ehlo_resp = er->data;
881 dbfn_close(dbm_file);
882 DEBUG(D_transport) debug_printf(
883 "EHLO response bits from cache: cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
884 er->data.cleartext_features, er->data.cleartext_auths,
885 er->data.crypted_features, er->data.crypted_auths);
886 return TRUE;
887 }
888 dbfn_close(dbm_file);
889 }
890 return FALSE;
891 }
892
893
894
895 /* Return an auths bitmap for the set of AUTH methods offered by the server
896 which match our authenticators. */
897
898 static unsigned short
899 study_ehlo_auths(smtp_context * sx)
900 {
901 uschar * names;
902 auth_instance * au;
903 uschar authnum;
904 unsigned short authbits = 0;
905
906 if (!sx->esmtp) return 0;
907 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
908 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
909 expand_nmax = -1; /* reset */
910 names = string_copyn(expand_nstring[1], expand_nlength[1]);
911
912 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
913 {
914 const uschar * list = names;
915 uschar * s;
916 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
917 if (strcmpic(au->public_name, s) == 0)
918 { authbits |= BIT(authnum); break; }
919 }
920
921 DEBUG(D_transport)
922 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
923 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
924
925 if (tls_out.active.sock >= 0)
926 sx->ehlo_resp.crypted_auths = authbits;
927 else
928 sx->ehlo_resp.cleartext_auths = authbits;
929 return authbits;
930 }
931
932
933
934
935 /* Wait for and check responses for early-pipelining.
936
937 Called from the lower-level smtp_read_response() function
938 used for general code that assume synchronisation, if context
939 flags indicate outstanding early-pipelining commands. Also
940 called fom sync_responses() which handles pipelined commands.
941
942 Arguments:
943 sx smtp connection context
944 countp number of outstanding responses, adjusted on return
945
946 Return:
947 OK all well
948 DEFER error on first read of TLS'd conn
949 FAIL SMTP error in response
950 */
951 int
952 smtp_reap_early_pipe(smtp_context * sx, int * countp)
953 {
954 BOOL pending_BANNER = sx->pending_BANNER;
955 BOOL pending_EHLO = sx->pending_EHLO;
956 int rc = FAIL;
957
958 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
959 sx->pending_EHLO = FALSE;
960
961 if (pending_BANNER)
962 {
963 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
964 (*countp)--;
965 if (!smtp_reap_banner(sx))
966 {
967 DEBUG(D_transport) debug_printf("bad banner\n");
968 if (tls_out.active.sock >= 0) rc = DEFER;
969 goto fail;
970 }
971 }
972
973 if (pending_EHLO)
974 {
975 unsigned peer_offered;
976 unsigned short authbits = 0, * ap;
977
978 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
979 (*countp)--;
980 if (!smtp_reap_ehlo(sx))
981 {
982 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
983 if (tls_out.active.sock >= 0) rc = DEFER;
984 goto fail;
985 }
986
987 /* Compare the actual EHLO response to the cached value we assumed;
988 on difference, dump or rewrite the cache and arrange for a retry. */
989
990 ap = tls_out.active.sock < 0
991 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
992
993 peer_offered = ehlo_response(sx->buffer,
994 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
995 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
996 | OPTION_UTF8 | OPTION_EARLY_PIPE
997 );
998 if ( peer_offered != sx->peer_offered
999 || (authbits = study_ehlo_auths(sx)) != *ap)
1000 {
1001 HDEBUG(D_transport)
1002 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1003 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1004 sx->peer_offered, *ap, peer_offered, authbits);
1005 *(tls_out.active.sock < 0
1006 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1007 *ap = authbits;
1008 if (peer_offered & OPTION_EARLY_PIPE)
1009 write_ehlo_cache_entry(sx);
1010 else
1011 invalidate_ehlo_cache_entry(sx);
1012
1013 return OK; /* just carry on */
1014 }
1015 }
1016 return OK;
1017
1018 fail:
1019 invalidate_ehlo_cache_entry(sx);
1020 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1021 return rc;
1022 }
1023 #endif
1024
1025
1026 /*************************************************
1027 * Synchronize SMTP responses *
1028 *************************************************/
1029
1030 /* This function is called from smtp_deliver() to receive SMTP responses from
1031 the server, and match them up with the commands to which they relate. When
1032 PIPELINING is not in use, this function is called after every command, and is
1033 therefore somewhat over-engineered, but it is simpler to use a single scheme
1034 that works both with and without PIPELINING instead of having two separate sets
1035 of code.
1036
1037 The set of commands that are buffered up with pipelining may start with MAIL
1038 and may end with DATA; in between are RCPT commands that correspond to the
1039 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1040 etc.) are never buffered.
1041
1042 Errors after MAIL or DATA abort the whole process leaving the response in the
1043 buffer. After MAIL, pending responses are flushed, and the original command is
1044 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1045 permitted to reject some recipient addresses while accepting others. However
1046 certain errors clearly abort the whole process. Set the value in
1047 transport_return to PENDING_OK if the address is accepted. If there is a
1048 subsequent general error, it will get reset accordingly. If not, it will get
1049 converted to OK at the end.
1050
1051 Arguments:
1052 sx smtp connection context
1053 count the number of responses to read
1054 pending_DATA 0 if last command sent was not DATA
1055 +1 if previously had a good recipient
1056 -1 if not previously had a good recipient
1057
1058 Returns: 3 if at least one address had 2xx and one had 5xx
1059 2 if at least one address had 5xx but none had 2xx
1060 1 if at least one host had a 2xx response, but none had 5xx
1061 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1062 -1 timeout while reading RCPT response
1063 -2 I/O or other non-response error for RCPT
1064 -3 DATA or MAIL failed - errno and buffer set
1065 -4 banner or EHLO failed (early-pipelining)
1066 -5 banner or EHLO failed (early-pipelining, TLS)
1067 */
1068
1069 static int
1070 sync_responses(smtp_context * sx, int count, int pending_DATA)
1071 {
1072 address_item * addr = sx->sync_addr;
1073 smtp_transport_options_block * ob = sx->conn_args.ob;
1074 int yield = 0;
1075
1076 #ifndef DISABLE_PIPE_CONNECT
1077 int rc;
1078 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1079 return rc == FAIL ? -4 : -5;
1080 #endif
1081
1082 /* Handle the response for a MAIL command. On error, reinstate the original
1083 command in big_buffer for error message use, and flush any further pending
1084 responses before returning, except after I/O errors and timeouts. */
1085
1086 if (sx->pending_MAIL)
1087 {
1088 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1089 count--;
1090 sx->pending_MAIL = FALSE;
1091 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1092 '2', ob->command_timeout))
1093 {
1094 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1095 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1096 if (errno == ERRNO_TLSFAILURE)
1097 return -5;
1098 if (errno == 0 && sx->buffer[0] != 0)
1099 {
1100 int save_errno = 0;
1101 if (sx->buffer[0] == '4')
1102 {
1103 save_errno = ERRNO_MAIL4XX;
1104 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1105 }
1106 count = smtp_discard_responses(sx, ob, count);
1107 errno = save_errno;
1108 }
1109
1110 if (pending_DATA) count--; /* Number of RCPT responses to come */
1111 while (count-- > 0) /* Mark any pending addrs with the host used */
1112 {
1113 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1114 addr->host_used = sx->conn_args.host;
1115 addr = addr->next;
1116 }
1117 return -3;
1118 }
1119 }
1120
1121 if (pending_DATA) count--; /* Number of RCPT responses to come */
1122
1123 /* Read and handle the required number of RCPT responses, matching each one up
1124 with an address by scanning for the next address whose status is PENDING_DEFER.
1125 */
1126
1127 while (count-- > 0)
1128 {
1129 while (addr->transport_return != PENDING_DEFER)
1130 if (!(addr = addr->next))
1131 return -2;
1132
1133 /* The address was accepted */
1134 addr->host_used = sx->conn_args.host;
1135
1136 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1137 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1138 '2', ob->command_timeout))
1139 {
1140 yield |= 1;
1141 addr->transport_return = PENDING_OK;
1142
1143 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1144 ensure that any address-specific retry record is expunged. We do this both
1145 for the basic key and for the version that also includes the sender. */
1146
1147 if (testflag(addr, af_dr_retry_exists))
1148 {
1149 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1150 sender_address);
1151 retry_add_item(addr, altkey, rf_delete);
1152 retry_add_item(addr, addr->address_retry_key, rf_delete);
1153 }
1154 }
1155
1156 /* Error on first TLS read */
1157
1158 else if (errno == ERRNO_TLSFAILURE)
1159 return -5;
1160
1161 /* Timeout while reading the response */
1162
1163 else if (errno == ETIMEDOUT)
1164 {
1165 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1166 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1167 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1168 retry_add_item(addr, addr->address_retry_key, 0);
1169 update_waiting = FALSE;
1170 return -1;
1171 }
1172
1173 /* Handle other errors in obtaining an SMTP response by returning -1. This
1174 will cause all the addresses to be deferred. Restore the SMTP command in
1175 big_buffer for which we are checking the response, so the error message
1176 makes sense. */
1177
1178 else if (errno != 0 || sx->buffer[0] == 0)
1179 {
1180 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1181
1182 /* Use taint-unchecked routines for writing into big_buffer, trusting
1183 that we'll never expand it. */
1184
1185 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1186 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1187 string_from_gstring(g);
1188 return -2;
1189 }
1190
1191 /* Handle SMTP permanent and temporary response codes. */
1192
1193 else
1194 {
1195 addr->message =
1196 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1197 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1198 string_printing(sx->buffer));
1199 setflag(addr, af_pass_message);
1200 if (!sx->verify)
1201 msglog_line(sx->conn_args.host, addr->message);
1202
1203 /* The response was 5xx */
1204
1205 if (sx->buffer[0] == '5')
1206 {
1207 addr->transport_return = FAIL;
1208 yield |= 2;
1209 }
1210
1211 /* The response was 4xx */
1212
1213 else
1214 {
1215 addr->transport_return = DEFER;
1216 addr->basic_errno = ERRNO_RCPT4XX;
1217 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1218
1219 if (!sx->verify)
1220 {
1221 #ifndef DISABLE_EVENT
1222 event_defer_errno = addr->more_errno;
1223 msg_event_raise(US"msg:rcpt:host:defer", addr);
1224 #endif
1225 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1226 start point for another MAIL command. */
1227
1228 if (addr->more_errno >> 8 == 52 && yield & 3)
1229 {
1230 if (!sx->RCPT_452)
1231 {
1232 DEBUG(D_transport)
1233 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1234 sx->RCPT_452 = TRUE;
1235 sx->next_addr = addr;
1236 }
1237 addr->transport_return = PENDING_DEFER;
1238 addr->basic_errno = 0;
1239 }
1240 else
1241 {
1242 /* Log temporary errors if there are more hosts to be tried.
1243 If not, log this last one in the == line. */
1244
1245 if (sx->conn_args.host->next)
1246 if (LOGGING(outgoing_port))
1247 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1248 sx->conn_args.host->address,
1249 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1250 else
1251 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1252 sx->conn_args.host->address, addr->message);
1253
1254 #ifndef DISABLE_EVENT
1255 else
1256 msg_event_raise(US"msg:rcpt:defer", addr);
1257 #endif
1258
1259 /* Do not put this message on the list of those waiting for specific
1260 hosts, as otherwise it is likely to be tried too often. */
1261
1262 update_waiting = FALSE;
1263
1264 /* Add a retry item for the address so that it doesn't get tried again
1265 too soon. If address_retry_include_sender is true, add the sender address
1266 to the retry key. */
1267
1268 retry_add_item(addr,
1269 ob->address_retry_include_sender
1270 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1271 : addr->address_retry_key,
1272 0);
1273 }
1274 }
1275 }
1276 }
1277 } /* Loop for next RCPT response */
1278
1279 /* Update where to start at for the next block of responses, unless we
1280 have already handled all the addresses. */
1281
1282 if (addr) sx->sync_addr = addr->next;
1283
1284 /* Handle a response to DATA. If we have not had any good recipients, either
1285 previously or in this block, the response is ignored. */
1286
1287 if (pending_DATA != 0)
1288 {
1289 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1290 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1291 '3', ob->command_timeout))
1292 {
1293 int code;
1294 uschar *msg;
1295 BOOL pass_message;
1296
1297 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1298 return -5;
1299
1300 if (pending_DATA > 0 || (yield & 1) != 0)
1301 {
1302 if (errno == 0 && sx->buffer[0] == '4')
1303 {
1304 errno = ERRNO_DATA4XX;
1305 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1306 }
1307 return -3;
1308 }
1309 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1310 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1311 "is in use and there were no good recipients\n", msg);
1312 }
1313 }
1314
1315 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1316 present) received 3xx. If any RCPTs were handled and yielded anything other
1317 than 4xx, yield will be set non-zero. */
1318
1319 return yield;
1320 }
1321
1322
1323
1324
1325
1326 /* Try an authenticator's client entry */
1327
1328 static int
1329 try_authenticator(smtp_context * sx, auth_instance * au)
1330 {
1331 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1332 host_item * host = sx->conn_args.host; /* host to deliver to */
1333 int rc;
1334
1335 sx->outblock.authenticating = TRUE;
1336 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1337 sx->buffer, sizeof(sx->buffer));
1338 sx->outblock.authenticating = FALSE;
1339 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1340
1341 /* A temporary authentication failure must hold up delivery to
1342 this host. After a permanent authentication failure, we carry on
1343 to try other authentication methods. If all fail hard, try to
1344 deliver the message unauthenticated unless require_auth was set. */
1345
1346 switch(rc)
1347 {
1348 case OK:
1349 f.smtp_authenticated = TRUE; /* stops the outer loop */
1350 client_authenticator = au->name;
1351 if (au->set_client_id)
1352 client_authenticated_id = expand_string(au->set_client_id);
1353 break;
1354
1355 /* Failure after writing a command */
1356
1357 case FAIL_SEND:
1358 return FAIL_SEND;
1359
1360 /* Failure after reading a response */
1361
1362 case FAIL:
1363 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1364 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1365 au->name, host->name, host->address, sx->buffer);
1366 break;
1367
1368 /* Failure by some other means. In effect, the authenticator
1369 decided it wasn't prepared to handle this case. Typically this
1370 is the result of "fail" in an expansion string. Do we need to
1371 log anything here? Feb 2006: a message is now put in the buffer
1372 if logging is required. */
1373
1374 case CANCELLED:
1375 if (*sx->buffer != 0)
1376 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1377 "authentication H=%s [%s] %s", au->name, host->name,
1378 host->address, sx->buffer);
1379 break;
1380
1381 /* Internal problem, message in buffer. */
1382
1383 case ERROR:
1384 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1385 DEFER, FALSE, &sx->delivery_start);
1386 return ERROR;
1387 }
1388 return OK;
1389 }
1390
1391
1392
1393
1394 /* Do the client side of smtp-level authentication.
1395
1396 Arguments:
1397 sx smtp connection context
1398
1399 sx->buffer should have the EHLO response from server (gets overwritten)
1400
1401 Returns:
1402 OK Success, or failed (but not required): global "smtp_authenticated" set
1403 DEFER Failed authentication (and was required)
1404 ERROR Internal problem
1405
1406 FAIL_SEND Failed communications - transmit
1407 FAIL - response
1408 */
1409
1410 static int
1411 smtp_auth(smtp_context * sx)
1412 {
1413 host_item * host = sx->conn_args.host; /* host to deliver to */
1414 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1415 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1416 #ifndef DISABLE_PIPE_CONNECT
1417 unsigned short authbits = tls_out.active.sock >= 0
1418 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1419 #endif
1420 uschar * fail_reason = US"server did not advertise AUTH support";
1421
1422 f.smtp_authenticated = FALSE;
1423 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1424
1425 if (!regex_AUTH)
1426 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1427
1428 /* Is the server offering AUTH? */
1429
1430 if ( sx->esmtp
1431 &&
1432 #ifndef DISABLE_PIPE_CONNECT
1433 sx->early_pipe_active ? authbits
1434 :
1435 #endif
1436 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1437 )
1438 {
1439 uschar * names = NULL;
1440 expand_nmax = -1; /* reset */
1441
1442 #ifndef DISABLE_PIPE_CONNECT
1443 if (!sx->early_pipe_active)
1444 #endif
1445 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1446
1447 /* Must not do this check until after we have saved the result of the
1448 regex match above as the check could be another RE. */
1449
1450 if ( require_auth == OK
1451 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1452 {
1453 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1454 fail_reason = US"no common mechanisms were found";
1455
1456 #ifndef DISABLE_PIPE_CONNECT
1457 if (sx->early_pipe_active)
1458 {
1459 /* Scan our authenticators (which support use by a client and were offered
1460 by the server (checked at cache-write time)), not suppressed by
1461 client_condition. If one is found, attempt to authenticate by calling its
1462 client function. We are limited to supporting up to 16 authenticator
1463 public-names by the number of bits in a short. */
1464
1465 auth_instance * au;
1466 uschar bitnum;
1467 int rc;
1468
1469 for (bitnum = 0, au = auths;
1470 !f.smtp_authenticated && au && bitnum < 16;
1471 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1472 {
1473 if ( au->client_condition
1474 && !expand_check_condition(au->client_condition, au->name,
1475 US"client authenticator"))
1476 {
1477 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1478 au->name, "client_condition is false");
1479 continue;
1480 }
1481
1482 /* Found data for a listed mechanism. Call its client entry. Set
1483 a flag in the outblock so that data is overwritten after sending so
1484 that reflections don't show it. */
1485
1486 fail_reason = US"authentication attempt(s) failed";
1487
1488 if ((rc = try_authenticator(sx, au)) != OK)
1489 return rc;
1490 }
1491 }
1492 else
1493 #endif
1494
1495 /* Scan the configured authenticators looking for one which is configured
1496 for use as a client, which is not suppressed by client_condition, and
1497 whose name matches an authentication mechanism supported by the server.
1498 If one is found, attempt to authenticate by calling its client function.
1499 */
1500
1501 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1502 {
1503 uschar *p = names;
1504
1505 if ( !au->client
1506 || ( au->client_condition
1507 && !expand_check_condition(au->client_condition, au->name,
1508 US"client authenticator")))
1509 {
1510 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1511 au->name,
1512 (au->client)? "client_condition is false" :
1513 "not configured as a client");
1514 continue;
1515 }
1516
1517 /* Loop to scan supported server mechanisms */
1518
1519 while (*p)
1520 {
1521 int len = Ustrlen(au->public_name);
1522 int rc;
1523
1524 while (isspace(*p)) p++;
1525
1526 if (strncmpic(au->public_name, p, len) != 0 ||
1527 (p[len] != 0 && !isspace(p[len])))
1528 {
1529 while (*p != 0 && !isspace(*p)) p++;
1530 continue;
1531 }
1532
1533 /* Found data for a listed mechanism. Call its client entry. Set
1534 a flag in the outblock so that data is overwritten after sending so
1535 that reflections don't show it. */
1536
1537 fail_reason = US"authentication attempt(s) failed";
1538
1539 if ((rc = try_authenticator(sx, au)) != OK)
1540 return rc;
1541
1542 break; /* If not authenticated, try next authenticator */
1543 } /* Loop for scanning supported server mechanisms */
1544 } /* Loop for further authenticators */
1545 }
1546 }
1547
1548 /* If we haven't authenticated, but are required to, give up. */
1549
1550 if (require_auth == OK && !f.smtp_authenticated)
1551 {
1552 invalidate_ehlo_cache_entry(sx);
1553 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1554 string_sprintf("authentication required but %s", fail_reason), DEFER,
1555 FALSE, &sx->delivery_start);
1556 return DEFER;
1557 }
1558
1559 return OK;
1560 }
1561
1562
1563 /* Construct AUTH appendix string for MAIL TO */
1564 /*
1565 Arguments
1566 sx context for smtp connection
1567 p point in sx->buffer to build string
1568 addrlist chain of potential addresses to deliver
1569
1570 Globals f.smtp_authenticated
1571 client_authenticated_sender
1572 Return True on error, otherwise buffer has (possibly empty) terminated string
1573 */
1574
1575 static BOOL
1576 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1577 {
1578 smtp_transport_options_block * ob = sx->conn_args.ob;
1579 uschar * local_authenticated_sender = authenticated_sender;
1580
1581 #ifdef notdef
1582 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1583 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1584 #endif
1585
1586 if (ob->authenticated_sender)
1587 {
1588 uschar * new = expand_string(ob->authenticated_sender);
1589 if (!new)
1590 {
1591 if (!f.expand_string_forcedfail)
1592 {
1593 uschar *message = string_sprintf("failed to expand "
1594 "authenticated_sender: %s", expand_string_message);
1595 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1596 return TRUE;
1597 }
1598 }
1599 else if (*new)
1600 local_authenticated_sender = new;
1601 }
1602
1603 /* Add the authenticated sender address if present */
1604
1605 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1606 && local_authenticated_sender)
1607 {
1608 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1609 auth_xtextencode(local_authenticated_sender,
1610 Ustrlen(local_authenticated_sender)));
1611 client_authenticated_sender = string_copy(local_authenticated_sender);
1612 }
1613 else
1614 *p = 0;
1615
1616 return FALSE;
1617 }
1618
1619
1620
1621 typedef struct smtp_compare_s
1622 {
1623 uschar *current_sender_address;
1624 struct transport_instance *tblock;
1625 } smtp_compare_t;
1626
1627
1628 /* Create a unique string that identifies this message, it is based on
1629 sender_address, helo_data and tls_certificate if enabled.
1630 */
1631
1632 static uschar *
1633 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1634 {
1635 address_item * addr1;
1636 uschar * if1 = US"";
1637 uschar * helo1 = US"";
1638 #ifndef DISABLE_TLS
1639 uschar * tlsc1 = US"";
1640 #endif
1641 uschar * save_sender_address = sender_address;
1642 uschar * local_identity = NULL;
1643 smtp_transport_options_block * ob = SOB tblock->options_block;
1644
1645 sender_address = sender;
1646
1647 addr1 = deliver_make_addr (sender, TRUE);
1648 deliver_set_expansions(addr1);
1649
1650 if (ob->interface)
1651 if1 = expand_string(ob->interface);
1652
1653 if (ob->helo_data)
1654 helo1 = expand_string(ob->helo_data);
1655
1656 #ifndef DISABLE_TLS
1657 if (ob->tls_certificate)
1658 tlsc1 = expand_string(ob->tls_certificate);
1659 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1660 #else
1661 local_identity = string_sprintf ("%s^%s", if1, helo1);
1662 #endif
1663
1664 deliver_set_expansions(NULL);
1665 sender_address = save_sender_address;
1666
1667 return local_identity;
1668 }
1669
1670
1671
1672 /* This routine is a callback that is called from transport_check_waiting.
1673 This function will evaluate the incoming message versus the previous
1674 message. If the incoming message is using a different local identity then
1675 we will veto this new message. */
1676
1677 static BOOL
1678 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1679 {
1680 uschar * message_local_identity,
1681 * current_local_identity,
1682 * new_sender_address;
1683
1684 current_local_identity =
1685 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1686
1687 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1688 return FALSE;
1689
1690 message_local_identity =
1691 smtp_local_identity(new_sender_address, s_compare->tblock);
1692
1693 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1694 }
1695
1696
1697
1698 static unsigned
1699 ehlo_response(uschar * buf, unsigned checks)
1700 {
1701 size_t bsize = Ustrlen(buf);
1702
1703 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1704
1705 #ifndef DISABLE_TLS
1706 if ( checks & OPTION_TLS
1707 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1708 #endif
1709 checks &= ~OPTION_TLS;
1710
1711 if ( checks & OPTION_IGNQ
1712 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1713 PCRE_EOPT, NULL, 0) < 0)
1714 checks &= ~OPTION_IGNQ;
1715
1716 if ( checks & OPTION_CHUNKING
1717 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1718 checks &= ~OPTION_CHUNKING;
1719
1720 #ifndef DISABLE_PRDR
1721 if ( checks & OPTION_PRDR
1722 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1723 #endif
1724 checks &= ~OPTION_PRDR;
1725
1726 #ifdef SUPPORT_I18N
1727 if ( checks & OPTION_UTF8
1728 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1729 #endif
1730 checks &= ~OPTION_UTF8;
1731
1732 if ( checks & OPTION_DSN
1733 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1734 checks &= ~OPTION_DSN;
1735
1736 if ( checks & OPTION_PIPE
1737 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1738 PCRE_EOPT, NULL, 0) < 0)
1739 checks &= ~OPTION_PIPE;
1740
1741 if ( checks & OPTION_SIZE
1742 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1743 checks &= ~OPTION_SIZE;
1744
1745 #ifndef DISABLE_PIPE_CONNECT
1746 if ( checks & OPTION_EARLY_PIPE
1747 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1748 PCRE_EOPT, NULL, 0) < 0)
1749 #endif
1750 checks &= ~OPTION_EARLY_PIPE;
1751
1752 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1753 return checks;
1754 }
1755
1756
1757
1758 /* Callback for emitting a BDAT data chunk header.
1759
1760 If given a nonzero size, first flush any buffered SMTP commands
1761 then emit the command.
1762
1763 Reap previous SMTP command responses if requested, and always reap
1764 the response from a previous BDAT command.
1765
1766 Args:
1767 tctx transport context
1768 chunk_size value for SMTP BDAT command
1769 flags
1770 tc_chunk_last add LAST option to SMTP BDAT command
1771 tc_reap_prev reap response to previous SMTP commands
1772
1773 Returns:
1774 OK or ERROR
1775 DEFER TLS error on first read (EHLO-resp); errno set
1776 */
1777
1778 static int
1779 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1780 unsigned flags)
1781 {
1782 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1783 smtp_context * sx = tctx->smtp_context;
1784 int cmd_count = 0;
1785 int prev_cmd_count;
1786
1787 /* Write SMTP chunk header command. If not reaping responses, note that
1788 there may be more writes (like, the chunk data) done soon. */
1789
1790 if (chunk_size > 0)
1791 {
1792 #ifndef DISABLE_PIPE_CONNECT
1793 BOOL new_conn = !!(sx->outblock.conn_args);
1794 #endif
1795 if((cmd_count = smtp_write_command(sx,
1796 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1797 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1798 ) < 0) return ERROR;
1799 if (flags & tc_chunk_last)
1800 data_command = string_copy(big_buffer); /* Save for later error message */
1801 #ifndef DISABLE_PIPE_CONNECT
1802 /* That command write could have been the one that made the connection.
1803 Copy the fd from the client conn ctx (smtp transport specific) to the
1804 generic transport ctx. */
1805
1806 if (new_conn)
1807 tctx->u.fd = sx->outblock.cctx->sock;
1808 #endif
1809 }
1810
1811 prev_cmd_count = cmd_count += sx->cmd_count;
1812
1813 /* Reap responses for any previous, but not one we just emitted */
1814
1815 if (chunk_size > 0)
1816 prev_cmd_count--;
1817 if (sx->pending_BDAT)
1818 prev_cmd_count--;
1819
1820 if (flags & tc_reap_prev && prev_cmd_count > 0)
1821 {
1822 DEBUG(D_transport) debug_printf("look for %d responses"
1823 " for previous pipelined cmds\n", prev_cmd_count);
1824
1825 switch(sync_responses(sx, prev_cmd_count, 0))
1826 {
1827 case 1: /* 2xx (only) => OK */
1828 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1829 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1830 case 0: break; /* No 2xx or 5xx, but no probs */
1831
1832 case -5: errno = ERRNO_TLSFAILURE;
1833 return DEFER;
1834 #ifndef DISABLE_PIPE_CONNECT
1835 case -4: /* non-2xx for pipelined banner or EHLO */
1836 #endif
1837 case -1: /* Timeout on RCPT */
1838 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1839 }
1840 cmd_count = 1;
1841 if (!sx->pending_BDAT)
1842 pipelining_active = FALSE;
1843 }
1844
1845 /* Reap response for an outstanding BDAT */
1846
1847 if (sx->pending_BDAT)
1848 {
1849 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1850
1851 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1852 ob->command_timeout))
1853 {
1854 if (errno == 0 && sx->buffer[0] == '4')
1855 {
1856 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1857 sx->addrlist->more_errno |=
1858 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1859 }
1860 return ERROR;
1861 }
1862 cmd_count--;
1863 sx->pending_BDAT = FALSE;
1864 pipelining_active = FALSE;
1865 }
1866 else if (chunk_size > 0)
1867 sx->pending_BDAT = TRUE;
1868
1869
1870 sx->cmd_count = cmd_count;
1871 return OK;
1872 }
1873
1874
1875
1876
1877
1878 /*************************************************
1879 * Make connection for given message *
1880 *************************************************/
1881
1882 /*
1883 Arguments:
1884 ctx connection context
1885 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1886 a second attempt after TLS initialization fails
1887
1888 Returns: OK - the connection was made and the delivery attempted;
1889 fd is set in the conn context, tls_out set up.
1890 DEFER - the connection could not be made, or something failed
1891 while setting up the SMTP session, or there was a
1892 non-message-specific error, such as a timeout.
1893 ERROR - helo_data or add_headers or authenticated_sender is
1894 specified for this transport, and the string failed
1895 to expand
1896 */
1897 int
1898 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1899 {
1900 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1901 BOOL pass_message = FALSE;
1902 uschar * message = NULL;
1903 int yield = OK;
1904 #ifndef DISABLE_TLS
1905 uschar * tls_errstr;
1906 #endif
1907
1908 sx->conn_args.ob = ob;
1909
1910 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1911 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1912 /* sx->ok = FALSE; */
1913 sx->send_rset = TRUE;
1914 sx->send_quit = TRUE;
1915 sx->setting_up = TRUE;
1916 sx->esmtp = TRUE;
1917 /* sx->esmtp_sent = FALSE; */
1918 #ifdef SUPPORT_I18N
1919 /* sx->utf8_needed = FALSE; */
1920 #endif
1921 sx->dsn_all_lasthop = TRUE;
1922 #ifdef SUPPORT_DANE
1923 /* sx->conn_args.dane = FALSE; */
1924 sx->dane_required =
1925 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1926 #endif
1927 #ifndef DISABLE_PIPE_CONNECT
1928 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
1929 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
1930 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
1931 #endif
1932
1933 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1934 /* sx->peer_offered = 0; */
1935 /* sx->avoid_option = 0; */
1936 sx->igquotstr = US"";
1937 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1938 #ifdef EXPERIMENTAL_DSN_INFO
1939 /* sx->smtp_greeting = NULL; */
1940 /* sx->helo_response = NULL; */
1941 #endif
1942
1943 smtp_command = US"initial connection";
1944 /* sx->buffer[0] = '\0'; */
1945
1946 /* Set up the buffer for reading SMTP response packets. */
1947
1948 sx->inblock.buffer = sx->inbuffer;
1949 sx->inblock.buffersize = sizeof(sx->inbuffer);
1950 sx->inblock.ptr = sx->inbuffer;
1951 sx->inblock.ptrend = sx->inbuffer;
1952
1953 /* Set up the buffer for holding SMTP commands while pipelining */
1954
1955 sx->outblock.buffer = sx->outbuffer;
1956 sx->outblock.buffersize = sizeof(sx->outbuffer);
1957 sx->outblock.ptr = sx->outbuffer;
1958 /* sx->outblock.cmd_count = 0; */
1959 /* sx->outblock.authenticating = FALSE; */
1960 /* sx->outblock.conn_args = NULL; */
1961
1962 /* Reset the parameters of a TLS session. */
1963
1964 tls_out.bits = 0;
1965 tls_out.cipher = NULL; /* the one we may use for this transport */
1966 tls_out.ourcert = NULL;
1967 tls_out.peercert = NULL;
1968 tls_out.peerdn = NULL;
1969 #ifdef USE_OPENSSL
1970 tls_out.sni = NULL;
1971 #endif
1972 tls_out.ocsp = OCSP_NOT_REQ;
1973 #ifdef EXPERIMENTAL_TLS_RESUME
1974 tls_out.resumption = 0;
1975 #endif
1976 tls_out.ver = NULL;
1977
1978 /* Flip the legacy TLS-related variables over to the outbound set in case
1979 they're used in the context of the transport. Don't bother resetting
1980 afterward (when being used by a transport) as we're in a subprocess.
1981 For verify, unflipped once the callout is dealt with */
1982
1983 tls_modify_variables(&tls_out);
1984
1985 #ifdef DISABLE_TLS
1986 if (sx->smtps)
1987 {
1988 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1989 DEFER, FALSE, &sx->delivery_start);
1990 return ERROR;
1991 }
1992 #endif
1993
1994 /* Make a connection to the host if this isn't a continued delivery, and handle
1995 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1996 specially so they can be identified for retries. */
1997
1998 if (!continue_hostname)
1999 {
2000 if (sx->verify)
2001 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2002
2003 /* Get the actual port the connection will use, into sx->conn_args.host */
2004
2005 smtp_port_for_connect(sx->conn_args.host, sx->port);
2006
2007 #ifdef SUPPORT_DANE
2008 /* Do TLSA lookup for DANE */
2009 {
2010 tls_out.dane_verified = FALSE;
2011 tls_out.tlsa_usage = 0;
2012
2013 if (sx->conn_args.host->dnssec == DS_YES)
2014 {
2015 int rc;
2016 if( sx->dane_required
2017 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2018 )
2019 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2020 {
2021 case OK: sx->conn_args.dane = TRUE;
2022 ob->tls_tempfail_tryclear = FALSE;
2023 break;
2024 case FAIL_FORCED: break;
2025 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2026 string_sprintf("DANE error: tlsa lookup %s",
2027 rc_to_string(rc)),
2028 rc, FALSE, &sx->delivery_start);
2029 # ifndef DISABLE_EVENT
2030 (void) event_raise(sx->conn_args.tblock->event_action,
2031 US"dane:fail", sx->dane_required
2032 ? US"dane-required" : US"dnssec-invalid");
2033 # endif
2034 return rc;
2035 }
2036 }
2037 else if (sx->dane_required)
2038 {
2039 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2040 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2041 FAIL, FALSE, &sx->delivery_start);
2042 # ifndef DISABLE_EVENT
2043 (void) event_raise(sx->conn_args.tblock->event_action,
2044 US"dane:fail", US"dane-required");
2045 # endif
2046 return FAIL;
2047 }
2048 }
2049 #endif /*DANE*/
2050
2051 /* Make the TCP connection */
2052
2053 sx->cctx.tls_ctx = NULL;
2054 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2055 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2056
2057 #ifndef DISABLE_PIPE_CONNECT
2058 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2059 sx->conn_args.host) == OK)
2060
2061 /* We don't find out the local ip address until the connect, so if
2062 the helo string might use it avoid doing early-pipelining. */
2063
2064 if ( !sx->helo_data
2065 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2066 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2067 )
2068 {
2069 sx->early_pipe_ok = TRUE;
2070 if ( read_ehlo_cache_entry(sx)
2071 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2072 {
2073 DEBUG(D_transport)
2074 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2075 sx->early_pipe_active = TRUE;
2076 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2077 }
2078 }
2079 else DEBUG(D_transport)
2080 debug_printf("helo needs $sending_ip_address\n");
2081
2082 PIPE_CONNECT_RETRY:
2083 if (sx->early_pipe_active)
2084 sx->outblock.conn_args = &sx->conn_args;
2085 else
2086 #endif
2087 {
2088 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2089 {
2090 set_errno_nohost(sx->addrlist,
2091 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2092 sx->verify ? US strerror(errno) : NULL,
2093 DEFER, FALSE, &sx->delivery_start);
2094 sx->send_quit = FALSE;
2095 return DEFER;
2096 }
2097 }
2098 /* Expand the greeting message while waiting for the initial response. (Makes
2099 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2100 delayed till here so that $sending_interface and $sending_port are set. */
2101 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2102 will be? Somehow I doubt it. */
2103
2104 if (sx->helo_data)
2105 if (!(sx->helo_data = expand_string(sx->helo_data)))
2106 if (sx->verify)
2107 log_write(0, LOG_MAIN|LOG_PANIC,
2108 "<%s>: failed to expand transport's helo_data value for callout: %s",
2109 sx->addrlist->address, expand_string_message);
2110
2111 #ifdef SUPPORT_I18N
2112 if (sx->helo_data)
2113 {
2114 expand_string_message = NULL;
2115 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2116 &expand_string_message)),
2117 expand_string_message)
2118 if (sx->verify)
2119 log_write(0, LOG_MAIN|LOG_PANIC,
2120 "<%s>: failed to expand transport's helo_data value for callout: %s",
2121 sx->addrlist->address, expand_string_message);
2122 else
2123 sx->helo_data = NULL;
2124 }
2125 #endif
2126
2127 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2128 is nevertheless a reasonably clean way of programming this kind of logic,
2129 where you want to escape on any error. */
2130
2131 if (!sx->smtps)
2132 {
2133 #ifndef DISABLE_PIPE_CONNECT
2134 if (sx->early_pipe_active)
2135 {
2136 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2137 sx->outblock.cmd_count = 1;
2138 }
2139 else
2140 #endif
2141 {
2142 #ifdef TCP_QUICKACK
2143 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2144 sizeof(off));
2145 #endif
2146 if (!smtp_reap_banner(sx))
2147 goto RESPONSE_FAILED;
2148 }
2149
2150 #ifndef DISABLE_EVENT
2151 {
2152 uschar * s;
2153 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2154 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2155 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2156 if (s)
2157 {
2158 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2159 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2160 DEFER, FALSE, &sx->delivery_start);
2161 yield = DEFER;
2162 goto SEND_QUIT;
2163 }
2164 }
2165 #endif
2166
2167 /* Now check if the helo_data expansion went well, and sign off cleanly if
2168 it didn't. */
2169
2170 if (!sx->helo_data)
2171 {
2172 message = string_sprintf("failed to expand helo_data: %s",
2173 expand_string_message);
2174 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2175 yield = DEFER;
2176 goto SEND_QUIT;
2177 }
2178 }
2179
2180 /** Debugging without sending a message
2181 sx->addrlist->transport_return = DEFER;
2182 goto SEND_QUIT;
2183 **/
2184
2185 /* Errors that occur after this point follow an SMTP command, which is
2186 left in big_buffer by smtp_write_command() for use in error messages. */
2187
2188 smtp_command = big_buffer;
2189
2190 /* Tell the remote who we are...
2191
2192 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2193 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2194 greeting is of this form. The assumption was that the far end supports it
2195 properly... but experience shows that there are some that give 5xx responses,
2196 even though the banner includes "ESMTP" (there's a bloody-minded one that
2197 says "ESMTP not spoken here"). Cope with that case.
2198
2199 September 2000: Time has passed, and it seems reasonable now to always send
2200 EHLO at the start. It is also convenient to make the change while installing
2201 the TLS stuff.
2202
2203 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2204 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2205 would be no way to send out the mails, so there is now a host list
2206 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2207 PIPELINING problem as well. Maybe it can also be useful to cure other
2208 problems with broken servers.
2209
2210 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2211 Then somebody tried it with a Microsoft mailer... It seems that all other
2212 mailers use upper case for some reason (the RFC is quite clear about case
2213 independence) so, for peace of mind, I gave in. */
2214
2215 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2216
2217 /* Alas; be careful, since this goto is not an error-out, so conceivably
2218 we might set data between here and the target which we assume to exist
2219 and be usable. I can see this coming back to bite us. */
2220 #ifndef DISABLE_TLS
2221 if (sx->smtps)
2222 {
2223 smtp_peer_options |= OPTION_TLS;
2224 suppress_tls = FALSE;
2225 ob->tls_tempfail_tryclear = FALSE;
2226 smtp_command = US"SSL-on-connect";
2227 goto TLS_NEGOTIATE;
2228 }
2229 #endif
2230
2231 if (sx->esmtp)
2232 {
2233 if (smtp_write_command(sx,
2234 #ifndef DISABLE_PIPE_CONNECT
2235 sx->early_pipe_active ? SCMD_BUFFER :
2236 #endif
2237 SCMD_FLUSH,
2238 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2239 goto SEND_FAILED;
2240 sx->esmtp_sent = TRUE;
2241
2242 #ifndef DISABLE_PIPE_CONNECT
2243 if (sx->early_pipe_active)
2244 {
2245 sx->pending_EHLO = TRUE;
2246
2247 /* If we have too many authenticators to handle and might need to AUTH
2248 for this transport, pipeline no further as we will need the
2249 list of auth methods offered. Reap the banner and EHLO. */
2250
2251 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2252 && f.smtp_in_early_pipe_no_auth)
2253 {
2254 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2255 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2256 goto SEND_FAILED;
2257 if (sync_responses(sx, 2, 0) != 0)
2258 {
2259 HDEBUG(D_transport)
2260 debug_printf("failed reaping pipelined cmd responses\n");
2261 goto RESPONSE_FAILED;
2262 }
2263 sx->early_pipe_active = FALSE;
2264 }
2265 }
2266 else
2267 #endif
2268 if (!smtp_reap_ehlo(sx))
2269 goto RESPONSE_FAILED;
2270 }
2271 else
2272 DEBUG(D_transport)
2273 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2274
2275 #ifndef DISABLE_PIPE_CONNECT
2276 if (!sx->early_pipe_active)
2277 #endif
2278 if (!sx->esmtp)
2279 {
2280 BOOL good_response;
2281 int n = sizeof(sx->buffer);
2282 uschar * rsp = sx->buffer;
2283
2284 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2285 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2286
2287 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2288 goto SEND_FAILED;
2289 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2290 #ifdef EXPERIMENTAL_DSN_INFO
2291 sx->helo_response = string_copy(rsp);
2292 #endif
2293 if (!good_response)
2294 {
2295 /* Handle special logging for a closed connection after HELO
2296 when had previously sent EHLO */
2297
2298 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2299 {
2300 errno = ERRNO_SMTPCLOSED;
2301 goto EHLOHELO_FAILED;
2302 }
2303 memmove(sx->buffer, rsp, Ustrlen(rsp));
2304 goto RESPONSE_FAILED;
2305 }
2306 }
2307
2308 if (sx->esmtp || sx->lmtp)
2309 {
2310 #ifndef DISABLE_PIPE_CONNECT
2311 if (!sx->early_pipe_active)
2312 #endif
2313 {
2314 sx->peer_offered = ehlo_response(sx->buffer,
2315 OPTION_TLS /* others checked later */
2316 #ifndef DISABLE_PIPE_CONNECT
2317 | (sx->early_pipe_ok
2318 ? OPTION_IGNQ
2319 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2320 #ifdef SUPPORT_I18N
2321 | OPTION_UTF8
2322 #endif
2323 | OPTION_EARLY_PIPE
2324 : 0
2325 )
2326 #endif
2327 );
2328 #ifndef DISABLE_PIPE_CONNECT
2329 if (sx->early_pipe_ok)
2330 {
2331 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2332
2333 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2334 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2335 {
2336 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2337 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2338 write_ehlo_cache_entry(sx);
2339 }
2340 }
2341 #endif
2342 }
2343
2344 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2345
2346 #ifndef DISABLE_TLS
2347 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2348 #endif
2349 }
2350 }
2351
2352 /* For continuing deliveries down the same channel, having re-exec'd the socket
2353 is the standard input; for a socket held open from verify it is recorded
2354 in the cutthrough context block. Either way we don't need to redo EHLO here
2355 (but may need to do so for TLS - see below).
2356 Set up the pointer to where subsequent commands will be left, for
2357 error messages. Note that smtp_peer_options will have been
2358 set from the command line if they were set in the process that passed the
2359 connection on. */
2360
2361 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2362 as the continue goes via transport_pass_socket() and doublefork and exec.
2363 It does not wait. Unclear how we keep separate host's responses
2364 separate - we could match up by host ip+port as a bodge. */
2365
2366 else
2367 {
2368 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2369 {
2370 sx->cctx = cutthrough.cctx;
2371 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2372 }
2373 else
2374 {
2375 sx->cctx.sock = 0; /* stdin */
2376 sx->cctx.tls_ctx = NULL;
2377 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2378 }
2379 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2380 smtp_command = big_buffer;
2381 sx->peer_offered = smtp_peer_options;
2382 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2383
2384 /* For a continued connection with TLS being proxied for us, or a
2385 held-open verify connection with TLS, nothing more to do. */
2386
2387 if ( continue_proxy_cipher
2388 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2389 && cutthrough.is_tls)
2390 )
2391 {
2392 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2393 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2394 continue_proxy_cipher ? "proxied" : "verify conn with");
2395 return OK;
2396 }
2397 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2398 }
2399
2400 /* If TLS is available on this connection, whether continued or not, attempt to
2401 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2402 send another EHLO - the server may give a different answer in secure mode. We
2403 use a separate buffer for reading the response to STARTTLS so that if it is
2404 negative, the original EHLO data is available for subsequent analysis, should
2405 the client not be required to use TLS. If the response is bad, copy the buffer
2406 for error analysis. */
2407
2408 #ifndef DISABLE_TLS
2409 if ( smtp_peer_options & OPTION_TLS
2410 && !suppress_tls
2411 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2412 && ( !sx->verify
2413 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2414 ) )
2415 {
2416 uschar buffer2[4096];
2417
2418 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2419 goto SEND_FAILED;
2420
2421 #ifndef DISABLE_PIPE_CONNECT
2422 /* If doing early-pipelining reap the banner and EHLO-response but leave
2423 the response for the STARTTLS we just sent alone. */
2424
2425 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2426 {
2427 HDEBUG(D_transport)
2428 debug_printf("failed reaping pipelined cmd responses\n");
2429 close(sx->cctx.sock);
2430 sx->cctx.sock = -1;
2431 sx->early_pipe_active = FALSE;
2432 goto PIPE_CONNECT_RETRY;
2433 }
2434 #endif
2435
2436 /* If there is an I/O error, transmission of this message is deferred. If
2437 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2438 false, we also defer. However, if there is a temporary rejection of STARTTLS
2439 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2440 STARTTLS, we carry on. This means we will try to send the message in clear,
2441 unless the host is in hosts_require_tls (tested below). */
2442
2443 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2444 {
2445 if ( errno != 0
2446 || buffer2[0] == 0
2447 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2448 )
2449 {
2450 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2451 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2452 goto RESPONSE_FAILED;
2453 }
2454 }
2455
2456 /* STARTTLS accepted: try to negotiate a TLS session. */
2457
2458 else
2459 TLS_NEGOTIATE:
2460 {
2461 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2462 {
2463 /* TLS negotiation failed; give an error. From outside, this function may
2464 be called again to try in clear on a new connection, if the options permit
2465 it for this host. */
2466 #ifdef USE_GNUTLS
2467 GNUTLS_CONN_FAILED:
2468 #endif
2469 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2470
2471 # ifdef SUPPORT_DANE
2472 if (sx->conn_args.dane)
2473 {
2474 log_write(0, LOG_MAIN,
2475 "DANE attempt failed; TLS connection to %s [%s]: %s",
2476 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2477 # ifndef DISABLE_EVENT
2478 (void) event_raise(sx->conn_args.tblock->event_action,
2479 US"dane:fail", US"validation-failure"); /* could do with better detail */
2480 # endif
2481 }
2482 # endif
2483
2484 errno = ERRNO_TLSFAILURE;
2485 message = string_sprintf("TLS session: %s", tls_errstr);
2486 sx->send_quit = FALSE;
2487 goto TLS_FAILED;
2488 }
2489
2490 /* TLS session is set up */
2491
2492 smtp_peer_options_wrap = smtp_peer_options;
2493 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2494 if (addr->transport_return == PENDING_DEFER)
2495 {
2496 addr->cipher = tls_out.cipher;
2497 addr->ourcert = tls_out.ourcert;
2498 addr->peercert = tls_out.peercert;
2499 addr->peerdn = tls_out.peerdn;
2500 addr->ocsp = tls_out.ocsp;
2501 addr->tlsver = tls_out.ver;
2502 }
2503 }
2504 }
2505
2506 /* if smtps, we'll have smtp_command set to something else; always safe to
2507 reset it here. */
2508 smtp_command = big_buffer;
2509
2510 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2511 helo_data is null, we are dealing with a connection that was passed from
2512 another process, and so we won't have expanded helo_data above. We have to
2513 expand it here. $sending_ip_address and $sending_port are set up right at the
2514 start of the Exim process (in exim.c). */
2515
2516 if (tls_out.active.sock >= 0)
2517 {
2518 uschar * greeting_cmd;
2519
2520 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2521 {
2522 uschar *message = string_sprintf("failed to expand helo_data: %s",
2523 expand_string_message);
2524 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2525 yield = DEFER;
2526 goto SEND_QUIT;
2527 }
2528
2529 #ifndef DISABLE_PIPE_CONNECT
2530 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2531 We're unlikely to get the group sent and delivered before the server sends its
2532 banner, but it's still worth sending as a group.
2533 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2534 the reverse. */
2535
2536 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2537 {
2538 sx->peer_offered = sx->ehlo_resp.crypted_features;
2539 if ((sx->early_pipe_active =
2540 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2541 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2542 }
2543 #endif
2544
2545 /* For SMTPS we need to wait for the initial OK response. */
2546 if (sx->smtps)
2547 #ifndef DISABLE_PIPE_CONNECT
2548 if (sx->early_pipe_active)
2549 {
2550 sx->pending_BANNER = TRUE;
2551 sx->outblock.cmd_count = 1;
2552 }
2553 else
2554 #endif
2555 if (!smtp_reap_banner(sx))
2556 goto RESPONSE_FAILED;
2557
2558 if (sx->lmtp)
2559 greeting_cmd = US"LHLO";
2560 else if (sx->esmtp)
2561 greeting_cmd = US"EHLO";
2562 else
2563 {
2564 greeting_cmd = US"HELO";
2565 DEBUG(D_transport)
2566 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2567 }
2568
2569 if (smtp_write_command(sx,
2570 #ifndef DISABLE_PIPE_CONNECT
2571 sx->early_pipe_active ? SCMD_BUFFER :
2572 #endif
2573 SCMD_FLUSH,
2574 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2575 goto SEND_FAILED;
2576
2577 #ifndef DISABLE_PIPE_CONNECT
2578 if (sx->early_pipe_active)
2579 sx->pending_EHLO = TRUE;
2580 else
2581 #endif
2582 {
2583 if (!smtp_reap_ehlo(sx))
2584 #ifdef USE_GNUTLS
2585 {
2586 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2587 cert late, under TLS1.3 - which means here; the first time we try to
2588 receive crypted data. Treat it as if it was a connect-time failure.
2589 See also the early-pipe equivalent... which will be hard; every call
2590 to sync_responses will need to check the result.
2591 It would be nicer to have GnuTLS check the cert during the handshake.
2592 Can it do that, with all the flexibility we need? */
2593
2594 tls_errstr = US"error on first read";
2595 goto GNUTLS_CONN_FAILED;
2596 }
2597 #else
2598 goto RESPONSE_FAILED;
2599 #endif
2600 smtp_peer_options = 0;
2601 }
2602 }
2603
2604 /* If the host is required to use a secure channel, ensure that we
2605 have one. */
2606
2607 else if ( sx->smtps
2608 # ifdef SUPPORT_DANE
2609 || sx->conn_args.dane
2610 # endif
2611 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2612 )
2613 {
2614 errno = ERRNO_TLSREQUIRED;
2615 message = string_sprintf("a TLS session is required, but %s",
2616 smtp_peer_options & OPTION_TLS
2617 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2618 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2619 if (sx->conn_args.dane)
2620 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2621 smtp_peer_options & OPTION_TLS
2622 ? US"validation-failure" /* could do with better detail */
2623 : US"starttls-not-supported");
2624 # endif
2625 goto TLS_FAILED;
2626 }
2627 #endif /*DISABLE_TLS*/
2628
2629 /* If TLS is active, we have just started it up and re-done the EHLO command,
2630 so its response needs to be analyzed. If TLS is not active and this is a
2631 continued session down a previously-used socket, we haven't just done EHLO, so
2632 we skip this. */
2633
2634 if (continue_hostname == NULL
2635 #ifndef DISABLE_TLS
2636 || tls_out.active.sock >= 0
2637 #endif
2638 )
2639 {
2640 if (sx->esmtp || sx->lmtp)
2641 {
2642 #ifndef DISABLE_PIPE_CONNECT
2643 if (!sx->early_pipe_active)
2644 #endif
2645 {
2646 sx->peer_offered = ehlo_response(sx->buffer,
2647 0 /* no TLS */
2648 #ifndef DISABLE_PIPE_CONNECT
2649 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2650 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2651 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2652 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2653
2654 #else
2655
2656 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2657 | OPTION_CHUNKING
2658 | OPTION_PRDR
2659 # ifdef SUPPORT_I18N
2660 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2661 /*XXX if we hand peercaps on to continued-conn processes,
2662 must not depend on this addr */
2663 # endif
2664 | OPTION_DSN
2665 | OPTION_PIPE
2666 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2667 #endif
2668 );
2669 #ifndef DISABLE_PIPE_CONNECT
2670 if (tls_out.active.sock >= 0)
2671 sx->ehlo_resp.crypted_features = sx->peer_offered;
2672 #endif
2673 }
2674
2675 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2676 lmtp_ignore_quota option was set. */
2677
2678 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2679
2680 /* If the response to EHLO specified support for the SIZE parameter, note
2681 this, provided size_addition is non-negative. */
2682
2683 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2684
2685 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2686 the current host, esmtp will be false, so PIPELINING can never be used. If
2687 the current host matches hosts_avoid_pipelining, don't do it. */
2688
2689 if ( sx->peer_offered & OPTION_PIPE
2690 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2691 smtp_peer_options |= OPTION_PIPE;
2692
2693 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2694 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2695
2696 if ( sx->peer_offered & OPTION_CHUNKING
2697 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2698 sx->peer_offered &= ~OPTION_CHUNKING;
2699
2700 if (sx->peer_offered & OPTION_CHUNKING)
2701 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2702
2703 #ifndef DISABLE_PRDR
2704 if ( sx->peer_offered & OPTION_PRDR
2705 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2706 sx->peer_offered &= ~OPTION_PRDR;
2707
2708 if (sx->peer_offered & OPTION_PRDR)
2709 DEBUG(D_transport) debug_printf("PRDR usable\n");
2710 #endif
2711
2712 /* Note if the server supports DSN */
2713 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2714 DEBUG(D_transport) debug_printf("%susing DSN\n",
2715 sx->peer_offered & OPTION_DSN ? "" : "not ");
2716
2717 #ifndef DISABLE_PIPE_CONNECT
2718 if ( sx->early_pipe_ok
2719 && !sx->early_pipe_active
2720 && tls_out.active.sock >= 0
2721 && smtp_peer_options & OPTION_PIPE
2722 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2723 & OPTION_EARLY_PIPE)
2724 {
2725 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2726 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2727 write_ehlo_cache_entry(sx);
2728 }
2729 #endif
2730
2731 /* Note if the response to EHLO specifies support for the AUTH extension.
2732 If it has, check that this host is one we want to authenticate to, and do
2733 the business. The host name and address must be available when the
2734 authenticator's client driver is running. */
2735
2736 switch (yield = smtp_auth(sx))
2737 {
2738 default: goto SEND_QUIT;
2739 case OK: break;
2740 case FAIL_SEND: goto SEND_FAILED;
2741 case FAIL: goto RESPONSE_FAILED;
2742 }
2743 }
2744 }
2745 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2746
2747 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2748 message-specific. */
2749
2750 sx->setting_up = FALSE;
2751
2752 #ifdef SUPPORT_I18N
2753 if (sx->addrlist->prop.utf8_msg)
2754 {
2755 uschar * s;
2756
2757 /* If the transport sets a downconversion mode it overrides any set by ACL
2758 for the message. */
2759
2760 if ((s = ob->utf8_downconvert))
2761 {
2762 if (!(s = expand_string(s)))
2763 {
2764 message = string_sprintf("failed to expand utf8_downconvert: %s",
2765 expand_string_message);
2766 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2767 yield = DEFER;
2768 goto SEND_QUIT;
2769 }
2770 switch (*s)
2771 {
2772 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2773 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2774 break;
2775 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2776 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2777 break;
2778 case '-': if (s[1] == '1')
2779 {
2780 sx->addrlist->prop.utf8_downcvt = FALSE;
2781 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2782 }
2783 break;
2784 }
2785 }
2786
2787 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2788 && !sx->addrlist->prop.utf8_downcvt_maybe;
2789 DEBUG(D_transport) if (!sx->utf8_needed)
2790 debug_printf("utf8: %s downconvert\n",
2791 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2792 }
2793
2794 /* If this is an international message we need the host to speak SMTPUTF8 */
2795 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2796 {
2797 errno = ERRNO_UTF8_FWD;
2798 goto RESPONSE_FAILED;
2799 }
2800 #endif /*SUPPORT_I18N*/
2801
2802 return OK;
2803
2804
2805 {
2806 int code;
2807
2808 RESPONSE_FAILED:
2809 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2810 {
2811 /* There is a testing facility for simulating a connection timeout, as I
2812 can't think of any other way of doing this. It converts a connection
2813 refused into a timeout if the timeout is set to 999999. This is done for
2814 a 3whs connection in ip_connect(), but a TFO connection does not error
2815 there - instead it gets ECONNREFUSED on the first data read. Tracking
2816 that a TFO really was done is too hard, or we would set a
2817 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2818 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2819 cmd-timeout. */
2820
2821 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2822 errno = ETIMEDOUT;
2823 set_errno_nohost(sx->addrlist,
2824 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2825 sx->verify ? US strerror(errno) : NULL,
2826 DEFER, FALSE, &sx->delivery_start);
2827 sx->send_quit = FALSE;
2828 return DEFER;
2829 }
2830
2831 /* really an error on an SMTP read */
2832 message = NULL;
2833 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2834 sx->buffer, &code, &message, &pass_message);
2835 yield = DEFER;
2836 goto FAILED;
2837
2838 SEND_FAILED:
2839 code = '4';
2840 message = US string_sprintf("send() to %s [%s] failed: %s",
2841 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2842 sx->send_quit = FALSE;
2843 yield = DEFER;
2844 goto FAILED;
2845
2846 EHLOHELO_FAILED:
2847 code = '4';
2848 message = string_sprintf("Remote host closed connection in response to %s"
2849 " (EHLO response was: %s)", smtp_command, sx->buffer);
2850 sx->send_quit = FALSE;
2851 yield = DEFER;
2852 goto FAILED;
2853
2854 /* This label is jumped to directly when a TLS negotiation has failed,
2855 or was not done for a host for which it is required. Values will be set
2856 in message and errno, and setting_up will always be true. Treat as
2857 a temporary error. */
2858
2859 #ifndef DISABLE_TLS
2860 TLS_FAILED:
2861 code = '4', yield = DEFER;
2862 goto FAILED;
2863 #endif
2864
2865 /* The failure happened while setting up the call; see if the failure was
2866 a 5xx response (this will either be on connection, or following HELO - a 5xx
2867 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2868 fail all addresses, as this host is never going to accept them. For other
2869 errors during setting up (timeouts or whatever), defer all addresses, and
2870 yield DEFER, so that the host is not tried again for a while.
2871
2872 XXX This peeking for another host feels like a layering violation. We want
2873 to note the host as unusable, but down here we shouldn't know if this was
2874 the last host to try for the addr(list). Perhaps the upper layer should be
2875 the one to do set_errno() ? The problem is that currently the addr is where
2876 errno etc. are stashed, but until we run out of hosts to try the errors are
2877 host-specific. Maybe we should enhance the host_item definition? */
2878
2879 FAILED:
2880 sx->ok = FALSE; /* For when reached by GOTO */
2881 set_errno(sx->addrlist, errno, message,
2882 sx->conn_args.host->next
2883 ? DEFER
2884 : code == '5'
2885 #ifdef SUPPORT_I18N
2886 || errno == ERRNO_UTF8_FWD
2887 #endif
2888 ? FAIL : DEFER,
2889 pass_message,
2890 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
2891 #ifdef EXPERIMENTAL_DSN_INFO
2892 sx->smtp_greeting, sx->helo_response,
2893 #endif
2894 &sx->delivery_start);
2895 }
2896
2897
2898 SEND_QUIT:
2899
2900 if (sx->send_quit)
2901 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2902
2903 #ifndef DISABLE_TLS
2904 if (sx->cctx.tls_ctx)
2905 {
2906 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2907 sx->cctx.tls_ctx = NULL;
2908 }
2909 #endif
2910
2911 /* Close the socket, and return the appropriate value, first setting
2912 works because the NULL setting is passed back to the calling process, and
2913 remote_max_parallel is forced to 1 when delivering over an existing connection,
2914 */
2915
2916 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2917 if (sx->send_quit)
2918 {
2919 shutdown(sx->cctx.sock, SHUT_WR);
2920 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2921 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2922 i--; /* drain socket */
2923 sx->send_quit = FALSE;
2924 }
2925 (void)close(sx->cctx.sock);
2926 sx->cctx.sock = -1;
2927
2928 #ifndef DISABLE_EVENT
2929 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2930 #endif
2931
2932 continue_transport = NULL;
2933 continue_hostname = NULL;
2934 return yield;
2935 }
2936
2937
2938
2939
2940 /* Create the string of options that will be appended to the MAIL FROM:
2941 in the connection context buffer */
2942
2943 static int
2944 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2945 {
2946 uschar * p = sx->buffer;
2947 address_item * addr;
2948 int address_count;
2949
2950 *p = 0;
2951
2952 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2953 send it, adding something to the message size to allow for imprecision
2954 and things that get added en route. Exim keeps the number of lines
2955 in a message, so we can give an accurate value for the original message, but we
2956 need some additional to handle added headers. (Double "." characters don't get
2957 included in the count.) */
2958
2959 if ( message_size > 0
2960 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2961 {
2962 /*XXX problem here under spool_files_wireformat?
2963 Or just forget about lines? Or inflate by a fixed proportion? */
2964
2965 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2966 while (*p) p++;
2967 }
2968
2969 #ifndef DISABLE_PRDR
2970 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2971 request that */
2972
2973 sx->prdr_active = FALSE;
2974 if (sx->peer_offered & OPTION_PRDR)
2975 for (address_item * addr = addrlist; addr; addr = addr->next)
2976 if (addr->transport_return == PENDING_DEFER)
2977 {
2978 for (addr = addr->next; addr; addr = addr->next)
2979 if (addr->transport_return == PENDING_DEFER)
2980 { /* at least two recipients to send */
2981 sx->prdr_active = TRUE;
2982 sprintf(CS p, " PRDR"); p += 5;
2983 break;
2984 }
2985 break;
2986 }
2987 #endif
2988
2989 #ifdef SUPPORT_I18N
2990 /* If it supports internationalised messages, and this meesage need that,
2991 request it */
2992
2993 if ( sx->peer_offered & OPTION_UTF8
2994 && addrlist->prop.utf8_msg
2995 && !addrlist->prop.utf8_downcvt
2996 )
2997 Ustrcpy(p, US" SMTPUTF8"), p += 9;
2998 #endif
2999
3000 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3001 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3002 addr && address_count < sx->max_rcpt;
3003 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3004 {
3005 address_count++;
3006 if (!(addr->dsn_flags & rf_dsnlasthop))
3007 {
3008 sx->dsn_all_lasthop = FALSE;
3009 break;
3010 }
3011 }
3012
3013 /* Add any DSN flags to the mail command */
3014
3015 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3016 {
3017 if (dsn_ret == dsn_ret_hdrs)
3018 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3019 else if (dsn_ret == dsn_ret_full)
3020 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3021
3022 if (dsn_envid)
3023 {
3024 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3025 while (*p) p++;
3026 }
3027 }
3028
3029 /* If an authenticated_sender override has been specified for this transport
3030 instance, expand it. If the expansion is forced to fail, and there was already
3031 an authenticated_sender for this message, the original value will be used.
3032 Other expansion failures are serious. An empty result is ignored, but there is
3033 otherwise no check - this feature is expected to be used with LMTP and other
3034 cases where non-standard addresses (e.g. without domains) might be required. */
3035
3036 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3037 }
3038
3039
3040 static void
3041 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3042 {
3043 uschar * p = sx->buffer;
3044 *p = 0;
3045
3046 /* Add any DSN flags to the rcpt command */
3047
3048 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3049 {
3050 if (addr->dsn_flags & rf_dsnflags)
3051 {
3052 BOOL first = TRUE;
3053
3054 Ustrcpy(p, US" NOTIFY=");
3055 while (*p) p++;
3056 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3057 {
3058 if (!first) *p++ = ',';
3059 first = FALSE;
3060 Ustrcpy(p, rf_names[i]);
3061 while (*p) p++;
3062 }
3063 }
3064
3065 if (addr->dsn_orcpt)
3066 {
3067 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3068 addr->dsn_orcpt);
3069 while (*p) p++;
3070 }
3071 }
3072 }
3073
3074
3075
3076 /*
3077 Return:
3078 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3079 -1 MAIL response error
3080 -2 any non-MAIL read i/o error
3081 -3 non-MAIL response timeout
3082 -4 internal error; channel still usable
3083 -5 transmit failed
3084 */
3085
3086 int
3087 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3088 {
3089 address_item * addr;
3090 int address_count, pipe_limit;
3091 int rc;
3092
3093 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3094 {
3095 *yield = ERROR;
3096 return -4;
3097 }
3098
3099 /* From here until we send the DATA command, we can make use of PIPELINING
3100 if the server host supports it. The code has to be able to check the responses
3101 at any point, for when the buffer fills up, so we write it totally generally.
3102 When PIPELINING is off, each command written reports that it has flushed the
3103 buffer. */
3104
3105 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3106
3107 {
3108 uschar * s = sx->from_addr;
3109 #ifdef SUPPORT_I18N
3110 uschar * errstr = NULL;
3111
3112 /* If we must downconvert, do the from-address here. Remember we had to
3113 for the to-addresses (done below), and also (ugly) for re-doing when building
3114 the delivery log line. */
3115
3116 if ( sx->addrlist->prop.utf8_msg
3117 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3118 )
3119 {
3120 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3121 {
3122 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3123 *yield = ERROR;
3124 return -4;
3125 }
3126 setflag(sx->addrlist, af_utf8_downcvt);
3127 }
3128 #endif
3129
3130 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3131 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3132 }
3133
3134 mail_command = string_copy(big_buffer); /* Save for later error message */
3135
3136 switch(rc)
3137 {
3138 case -1: /* Transmission error */
3139 return -5;
3140
3141 case +1: /* Cmd was sent */
3142 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3143 (SOB sx->conn_args.ob)->command_timeout))
3144 {
3145 if (errno == 0 && sx->buffer[0] == '4')
3146 {
3147 errno = ERRNO_MAIL4XX;
3148 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3149 }
3150 return -1;
3151 }
3152 sx->pending_MAIL = FALSE;
3153 break;
3154
3155 /* otherwise zero: command queued for pipeline */
3156 }
3157
3158 /* Pass over all the relevant recipient addresses for this host, which are the
3159 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3160 several before we have to read the responses for those seen so far. This
3161 checking is done by a subroutine because it also needs to be done at the end.
3162 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3163 the next one if not all are sent.
3164
3165 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3166 last address because we want to abort if any recipients have any kind of
3167 problem, temporary or permanent. We know that all recipient addresses will have
3168 the PENDING_DEFER status, because only one attempt is ever made, and we know
3169 that max_rcpt will be large, so all addresses will be done at once.
3170
3171 For verify we flush the pipeline after any (the only) rcpt address. */
3172
3173 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3174 addr && address_count < sx->max_rcpt;
3175 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3176 {
3177 int cmds_sent;
3178 BOOL no_flush;
3179 uschar * rcpt_addr;
3180
3181 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3182 ? dsn_support_yes : dsn_support_no;
3183
3184 address_count++;
3185 if (pipe_limit-- <= 0)
3186 { no_flush = FALSE; pipe_limit = 100; }
3187 else
3188 no_flush = pipelining_active && !sx->verify
3189 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3190
3191 build_rcptcmd_options(sx, addr);
3192
3193 /* Now send the RCPT command, and process outstanding responses when
3194 necessary. After a timeout on RCPT, we just end the function, leaving the
3195 yield as OK, because this error can often mean that there is a problem with
3196 just one address, so we don't want to delay the host. */
3197
3198 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3199
3200 #ifdef SUPPORT_I18N
3201 if ( testflag(sx->addrlist, af_utf8_downcvt)
3202 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3203 )
3204 {
3205 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3206 errno = ERRNO_EXPANDFAIL;
3207 return -5; /*XXX too harsh? */
3208 }
3209 #endif
3210
3211 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3212 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3213
3214 if (cmds_sent < 0) return -5;
3215 if (cmds_sent > 0)
3216 {
3217 switch(sync_responses(sx, cmds_sent, 0))
3218 {
3219 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3220 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3221 break;
3222
3223 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3224 if (!sx->lmtp) /* can't tell about progress yet */
3225 sx->completed_addr = TRUE;
3226 case 0: /* No 2xx or 5xx, but no probs */
3227 /* If any RCPT got a 452 response then next_addr has been updated
3228 for restarting with a new MAIL on the same connection. Send no more
3229 RCPTs for this MAIL. */
3230
3231 if (sx->RCPT_452)
3232 {
3233 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3234 sx->RCPT_452 = FALSE;
3235 /* sx->next_addr has been reset for fast_retry */
3236 return 0;
3237 }
3238 break;
3239
3240 case -1: return -3; /* Timeout on RCPT */
3241 case -2: return -2; /* non-MAIL read i/o error */
3242 default: return -1; /* any MAIL error */
3243
3244 #ifndef DISABLE_PIPE_CONNECT
3245 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3246 case -5: return -1; /* TLS first-read error */
3247 #endif
3248 }
3249 }
3250 } /* Loop for next address */
3251
3252 sx->next_addr = addr;
3253 return 0;
3254 }
3255
3256
3257 #ifndef DISABLE_TLS
3258 /*****************************************************
3259 * Proxy TLS connection for another transport process *
3260 ******************************************************/
3261 /*
3262 Close the unused end of the pipe, fork once more, then use the given buffer
3263 as a staging area, and select on both the given fd and the TLS'd client-fd for
3264 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3265 Do blocking full-size writes, and reads under a timeout. Once both input
3266 channels are closed, exit the process.
3267
3268 Arguments:
3269 ct_ctx tls context
3270 buf space to use for buffering
3271 bufsiz size of buffer
3272 pfd pipe filedescriptor array; [0] is comms to proxied process
3273 timeout per-read timeout, seconds
3274
3275 Does not return.
3276 */
3277
3278 void
3279 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3280 int timeout)
3281 {
3282 fd_set rfds, efds;
3283 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3284 int rc, i;
3285
3286 close(pfd[1]);
3287 if ((rc = exim_fork(US"tls-proxy")))
3288 _exit(rc < 0