a3f0351e374d966edb76b5f8ae72e06390092568
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
12 # error TLS is required for DANE
13 #endif
14
15
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
20
21 #define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
22
23 optionlist smtp_transport_options[] = {
24 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
25 OPT_OFF(transport_instance, expand_multi_domain) },
26 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
27 LOFF(expand_retry_include_ip_address) },
28
29 { "address_retry_include_sender", opt_bool,
30 LOFF(address_retry_include_sender) },
31 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
32 #ifdef EXPERIMENTAL_ARC
33 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
34 #endif
35 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
36 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
37 { "command_timeout", opt_time, LOFF(command_timeout) },
38 { "connect_timeout", opt_time, LOFF(connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 OPT_OFF(transport_instance, connection_max_messages) },
41 # ifdef SUPPORT_DANE
42 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
43 # endif
44 { "data_timeout", opt_time, LOFF(data_timeout) },
45 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
46 #ifndef DISABLE_DKIM
47 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
48 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
49 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
50 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
51 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
52 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
53 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
54 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
55 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
56 #endif
57 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
58 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
60 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
61 { "dscp", opt_stringptr, LOFF(dscp) },
62 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
63 { "final_timeout", opt_time, LOFF(final_timeout) },
64 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
65 { "helo_data", opt_stringptr, LOFF(helo_data) },
66 { "hosts", opt_stringptr, LOFF(hosts) },
67 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
68 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
69 #ifndef DISABLE_TLS
70 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
71 #endif
72 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
73 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
74 #ifndef DISABLE_TLS
75 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
76 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
77 #endif
78 { "hosts_override", opt_bool, LOFF(hosts_override) },
79 #ifndef DISABLE_PIPE_CONNECT
80 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
81 #endif
82 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
83 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
84 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
85 #endif
86 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
87 #ifndef DISABLE_TLS
88 # ifdef SUPPORT_DANE
89 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
90 # endif
91 # ifndef DISABLE_OCSP
92 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
93 # endif
94 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
95 #endif
96 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
97 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
98 #ifdef SUPPORT_DANE
99 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
100 #endif
101 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
102 #ifndef DISABLE_PRDR
103 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
104 #endif
105 #ifndef DISABLE_TLS
106 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
107 #endif
108 { "interface", opt_stringptr, LOFF(interface) },
109 { "keepalive", opt_bool, LOFF(keepalive) },
110 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
111 { "max_rcpt", opt_int | opt_public,
112 OPT_OFF(transport_instance, max_addresses) },
113 { "multi_domain", opt_expand_bool | opt_public,
114 OPT_OFF(transport_instance, multi_domain) },
115 { "port", opt_stringptr, LOFF(port) },
116 { "protocol", opt_stringptr, LOFF(protocol) },
117 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
118 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
119 { "size_addition", opt_int, LOFF(size_addition) },
120 #ifdef SUPPORT_SOCKS
121 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
122 #endif
123 #ifndef DISABLE_TLS
124 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
125 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
126 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
127 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
128 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
129 # ifdef EXPERIMENTAL_TLS_RESUME
130 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
131 # endif
132 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
133 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
134 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
135 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
136 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
137 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
138 #endif
139 #ifdef SUPPORT_I18N
140 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
141 #endif
142 };
143
144 /* Size of the options list. An extern variable has to be used so that its
145 address can appear in the tables drtables.c. */
146
147 int smtp_transport_options_count = nelem(smtp_transport_options);
148
149
150 #ifdef MACRO_PREDEF
151
152 /* Dummy values */
153 smtp_transport_options_block smtp_transport_option_defaults = {0};
154 void smtp_transport_init(transport_instance *tblock) {}
155 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
156 void smtp_transport_closedown(transport_instance *tblock) {}
157
158 #else /*!MACRO_PREDEF*/
159
160
161 /* Default private options block for the smtp transport. */
162
163 smtp_transport_options_block smtp_transport_option_defaults = {
164 .hosts = NULL,
165 .fallback_hosts = NULL,
166 .hostlist = NULL,
167 .fallback_hostlist = NULL,
168 .helo_data = US"$primary_hostname",
169 .interface = NULL,
170 .port = NULL,
171 .protocol = US"smtp",
172 .dscp = NULL,
173 .serialize_hosts = NULL,
174 .hosts_try_auth = NULL,
175 .hosts_require_auth = NULL,
176 .hosts_try_chunking = US"*",
177 #ifdef SUPPORT_DANE
178 .hosts_try_dane = US"*",
179 .hosts_require_dane = NULL,
180 .dane_require_tls_ciphers = NULL,
181 #endif
182 .hosts_try_fastopen = US"*",
183 #ifndef DISABLE_PRDR
184 .hosts_try_prdr = US"*",
185 #endif
186 #ifndef DISABLE_OCSP
187 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
188 .hosts_require_ocsp = NULL,
189 #endif
190 .hosts_require_tls = NULL,
191 .hosts_avoid_tls = NULL,
192 .hosts_verify_avoid_tls = NULL,
193 .hosts_avoid_pipelining = NULL,
194 #ifndef DISABLE_PIPE_CONNECT
195 .hosts_pipe_connect = NULL,
196 #endif
197 .hosts_avoid_esmtp = NULL,
198 #ifndef DISABLE_TLS
199 .hosts_nopass_tls = NULL,
200 .hosts_noproxy_tls = NULL,
201 #endif
202 .command_timeout = 5*60,
203 .connect_timeout = 5*60,
204 .data_timeout = 5*60,
205 .final_timeout = 10*60,
206 .size_addition = 1024,
207 .hosts_max_try = 5,
208 .hosts_max_try_hardlimit = 50,
209 .address_retry_include_sender = TRUE,
210 .allow_localhost = FALSE,
211 .authenticated_sender_force = FALSE,
212 .gethostbyname = FALSE,
213 .dns_qualify_single = TRUE,
214 .dns_search_parents = FALSE,
215 .dnssec = { .request= US"*", .require=NULL },
216 .delay_after_cutoff = TRUE,
217 .hosts_override = FALSE,
218 .hosts_randomize = FALSE,
219 .keepalive = TRUE,
220 .lmtp_ignore_quota = FALSE,
221 .expand_retry_include_ip_address = NULL,
222 .retry_include_ip_address = TRUE,
223 #ifdef SUPPORT_SOCKS
224 .socks_proxy = NULL,
225 #endif
226 #ifndef DISABLE_TLS
227 .tls_certificate = NULL,
228 .tls_crl = NULL,
229 .tls_privatekey = NULL,
230 .tls_require_ciphers = NULL,
231 .tls_sni = NULL,
232 .tls_verify_certificates = US"system",
233 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
234 .tls_tempfail_tryclear = TRUE,
235 # ifdef EXPERIMENTAL_TLS_RESUME
236 .tls_resumption_hosts = NULL,
237 # endif
238 .tls_verify_hosts = NULL,
239 .tls_try_verify_hosts = US"*",
240 .tls_verify_cert_hostnames = US"*",
241 #endif
242 #ifdef SUPPORT_I18N
243 .utf8_downconvert = NULL,
244 #endif
245 #ifndef DISABLE_DKIM
246 .dkim =
247 {.dkim_domain = NULL,
248 .dkim_identity = NULL,
249 .dkim_private_key = NULL,
250 .dkim_selector = NULL,
251 .dkim_canon = NULL,
252 .dkim_sign_headers = NULL,
253 .dkim_strict = NULL,
254 .dkim_hash = US"sha256",
255 .dkim_timestamps = NULL,
256 .dot_stuffed = FALSE,
257 .force_bodyhash = FALSE,
258 # ifdef EXPERIMENTAL_ARC
259 .arc_signspec = NULL,
260 # endif
261 },
262 # ifdef EXPERIMENTAL_ARC
263 .arc_sign = NULL,
264 # endif
265 #endif
266 };
267
268 /* some DSN flags for use later */
269
270 static int rf_list[] = {rf_notify_never, rf_notify_success,
271 rf_notify_failure, rf_notify_delay };
272
273 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
274
275
276
277 /* Local statics */
278
279 static uschar *smtp_command; /* Points to last cmd for error messages */
280 static uschar *mail_command; /* Points to MAIL cmd for error messages */
281 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
282 static BOOL update_waiting; /* TRUE to update the "wait" database */
283
284 /*XXX move to smtp_context */
285 static BOOL pipelining_active; /* current transaction is in pipe mode */
286
287
288 static unsigned ehlo_response(uschar * buf, unsigned checks);
289
290
291 /******************************************************************************/
292
293 void
294 smtp_deliver_init(void)
295 {
296 if (!regex_PIPELINING) regex_PIPELINING =
297 regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE);
298
299 if (!regex_SIZE) regex_SIZE =
300 regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE);
301
302 if (!regex_AUTH) regex_AUTH =
303 regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
304
305 #ifndef DISABLE_TLS
306 if (!regex_STARTTLS) regex_STARTTLS =
307 regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
308 #endif
309
310 if (!regex_CHUNKING) regex_CHUNKING =
311 regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE);
312
313 #ifndef DISABLE_PRDR
314 if (!regex_PRDR) regex_PRDR =
315 regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE);
316 #endif
317
318 #ifdef SUPPORT_I18N
319 if (!regex_UTF8) regex_UTF8 =
320 regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE);
321 #endif
322
323 if (!regex_DSN) regex_DSN =
324 regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE);
325
326 if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA =
327 regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE);
328
329 #ifndef DISABLE_PIPE_CONNECT
330 if (!regex_EARLY_PIPE) regex_EARLY_PIPE =
331 regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE);
332 #endif
333 }
334
335
336 /*************************************************
337 * Setup entry point *
338 *************************************************/
339
340 /* This function is called when the transport is about to be used,
341 but before running it in a sub-process. It is used for two things:
342
343 (1) To set the fallback host list in addresses, when delivering.
344 (2) To pass back the interface, port, protocol, and other options, for use
345 during callout verification.
346
347 Arguments:
348 tblock pointer to the transport instance block
349 addrlist list of addresses about to be transported
350 tf if not NULL, pointer to block in which to return options
351 uid the uid that will be set (not used)
352 gid the gid that will be set (not used)
353 errmsg place for error message (not used)
354
355 Returns: OK always (FAIL, DEFER not used)
356 */
357
358 static int
359 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
360 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
361 {
362 smtp_transport_options_block *ob = SOB tblock->options_block;
363
364 errmsg = errmsg; /* Keep picky compilers happy */
365 uid = uid;
366 gid = gid;
367
368 /* Pass back options if required. This interface is getting very messy. */
369
370 if (tf)
371 {
372 tf->interface = ob->interface;
373 tf->port = ob->port;
374 tf->protocol = ob->protocol;
375 tf->hosts = ob->hosts;
376 tf->hosts_override = ob->hosts_override;
377 tf->hosts_randomize = ob->hosts_randomize;
378 tf->gethostbyname = ob->gethostbyname;
379 tf->qualify_single = ob->dns_qualify_single;
380 tf->search_parents = ob->dns_search_parents;
381 tf->helo_data = ob->helo_data;
382 }
383
384 /* Set the fallback host list for all the addresses that don't have fallback
385 host lists, provided that the local host wasn't present in the original host
386 list. */
387
388 if (!testflag(addrlist, af_local_host_removed))
389 for (; addrlist; addrlist = addrlist->next)
390 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
391
392 return OK;
393 }
394
395
396
397 /*************************************************
398 * Initialization entry point *
399 *************************************************/
400
401 /* Called for each instance, after its options have been read, to
402 enable consistency checks to be done, or anything else that needs
403 to be set up.
404
405 Argument: pointer to the transport instance block
406 Returns: nothing
407 */
408
409 void
410 smtp_transport_init(transport_instance *tblock)
411 {
412 smtp_transport_options_block *ob = SOB tblock->options_block;
413
414 /* Retry_use_local_part defaults FALSE if unset */
415
416 if (tblock->retry_use_local_part == TRUE_UNSET)
417 tblock->retry_use_local_part = FALSE;
418
419 /* Set the default port according to the protocol */
420
421 if (!ob->port)
422 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
423 ? US"lmtp"
424 : strcmpic(ob->protocol, US"smtps") == 0
425 ? US"smtps" : US"smtp";
426
427 /* Set up the setup entry point, to be called before subprocesses for this
428 transport. */
429
430 tblock->setup = smtp_transport_setup;
431
432 /* Complain if any of the timeouts are zero. */
433
434 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
435 ob->final_timeout <= 0)
436 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
437 "command, data, or final timeout value is zero for %s transport",
438 tblock->name);
439
440 /* If hosts_override is set and there are local hosts, set the global
441 flag that stops verify from showing router hosts. */
442
443 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
444
445 /* If there are any fallback hosts listed, build a chain of host items
446 for them, but do not do any lookups at this time. */
447
448 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
449 }
450
451
452
453
454
455 /*************************************************
456 * Set delivery info into all active addresses *
457 *************************************************/
458
459 /* Only addresses whose status is >= PENDING are relevant. A lesser
460 status means that an address is not currently being processed.
461
462 Arguments:
463 addrlist points to a chain of addresses
464 errno_value to put in each address's errno field
465 msg to put in each address's message field
466 rc to put in each address's transport_return field
467 pass_message if TRUE, set the "pass message" flag in the address
468 host if set, mark addrs as having used this host
469 smtp_greeting from peer
470 helo_response from peer
471 start points to timestamp of delivery start
472
473 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
474 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
475 this particular type of timeout.
476
477 Returns: nothing
478 */
479
480 static void
481 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
482 BOOL pass_message, host_item * host,
483 #ifdef EXPERIMENTAL_DSN_INFO
484 const uschar * smtp_greeting, const uschar * helo_response,
485 #endif
486 struct timeval * start
487 )
488 {
489 int orvalue = 0;
490 struct timeval deliver_time;
491
492 if (errno_value == ERRNO_CONNECTTIMEOUT)
493 {
494 errno_value = ETIMEDOUT;
495 orvalue = RTEF_CTOUT;
496 }
497 timesince(&deliver_time, start);
498
499 for (address_item * addr = addrlist; addr; addr = addr->next)
500 if (addr->transport_return >= PENDING)
501 {
502 addr->basic_errno = errno_value;
503 addr->more_errno |= orvalue;
504 addr->delivery_time = deliver_time;
505 if (msg)
506 {
507 addr->message = msg;
508 if (pass_message) setflag(addr, af_pass_message);
509 }
510 addr->transport_return = rc;
511 if (host)
512 {
513 addr->host_used = host;
514 #ifdef EXPERIMENTAL_DSN_INFO
515 if (smtp_greeting)
516 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
517 addr->smtp_greeting = smtp_greeting;
518
519 if (helo_response)
520 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
521 addr->helo_response = helo_response;
522 #endif
523 }
524 }
525 }
526
527 static void
528 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
529 BOOL pass_message, struct timeval * start)
530 {
531 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
532 #ifdef EXPERIMENTAL_DSN_INFO
533 NULL, NULL,
534 #endif
535 start);
536 }
537
538
539 /*************************************************
540 * Check an SMTP response *
541 *************************************************/
542
543 /* This function is given an errno code and the SMTP response buffer
544 to analyse, together with the host identification for generating messages. It
545 sets an appropriate message and puts the first digit of the response code into
546 the yield variable. If no response was actually read, a suitable digit is
547 chosen.
548
549 Arguments:
550 host the current host, to get its name for messages
551 errno_value pointer to the errno value
552 more_errno from the top address for use with ERRNO_FILTER_FAIL
553 buffer the SMTP response buffer
554 yield where to put a one-digit SMTP response code
555 message where to put an error message
556 pass_message set TRUE if message is an SMTP response
557
558 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
559 */
560
561 static BOOL
562 check_response(host_item *host, int *errno_value, int more_errno,
563 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
564 {
565 uschar * pl = pipelining_active ? US"pipelined " : US"";
566 const uschar * s;
567
568 *yield = '4'; /* Default setting is to give a temporary error */
569
570 switch(*errno_value)
571 {
572 case ETIMEDOUT: /* Handle response timeout */
573 *message = US string_sprintf("SMTP timeout after %s%s",
574 pl, smtp_command);
575 if (transport_count > 0)
576 *message = US string_sprintf("%s (%d bytes written)", *message,
577 transport_count);
578 return FALSE;
579
580 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
581 s = string_printing(buffer);
582 while (isspace(*s)) s++;
583 *message = *s == 0
584 ? string_sprintf("Malformed SMTP reply (an empty line) "
585 "in response to %s%s", pl, smtp_command)
586 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
587 pl, smtp_command, s);
588 return FALSE;
589
590 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
591 GnuTLS and TLS1.3 */
592 *message = US"bad first read from TLS conn";
593 return TRUE;
594
595 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
596 can't send QUIT as we mustn't end the DATA. */
597 *message = string_sprintf("transport filter process failed (%d)%s",
598 more_errno,
599 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
600 return FALSE;
601
602 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
603 can't send QUIT as we mustn't end the DATA. */
604 *message =
605 string_sprintf("failed to expand headers_add or headers_remove: %s",
606 expand_string_message);
607 return FALSE;
608
609 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
610 *message = US"failed to write a data block";
611 return FALSE;
612
613 #ifdef SUPPORT_I18N
614 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
615 *message = US"utf8 support required but not offered for forwarding";
616 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
617 return TRUE;
618 #endif
619 }
620
621 /* Handle error responses from the remote mailer. */
622
623 if (buffer[0] != 0)
624 {
625 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
626 "%s", pl, smtp_command, s = string_printing(buffer));
627 *pass_message = TRUE;
628 *yield = buffer[0];
629 return TRUE;
630 }
631
632 /* No data was read. If there is no errno, this must be the EOF (i.e.
633 connection closed) case, which causes deferral. An explicit connection reset
634 error has the same effect. Otherwise, put the host's identity in the message,
635 leaving the errno value to be interpreted as well. In all cases, we have to
636 assume the connection is now dead. */
637
638 if (*errno_value == 0 || *errno_value == ECONNRESET)
639 {
640 *errno_value = ERRNO_SMTPCLOSED;
641 *message = US string_sprintf("Remote host closed connection "
642 "in response to %s%s", pl, smtp_command);
643 }
644 else
645 *message = US string_sprintf("%s [%s]", host->name, host->address);
646
647 return FALSE;
648 }
649
650
651
652 /*************************************************
653 * Write error message to logs *
654 *************************************************/
655
656 /* This writes to the main log and to the message log.
657
658 Arguments:
659 host the current host
660 detail the current message (addr_item->message)
661 basic_errno the errno (addr_item->basic_errno)
662
663 Returns: nothing
664 */
665
666 static void
667 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
668 {
669 gstring * message = LOGGING(outgoing_port)
670 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
671 host->port == PORT_NONE ? 25 : host->port)
672 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
673
674 if (suffix)
675 {
676 message = string_fmt_append(message, ": %s", suffix);
677 if (basic_errno > 0)
678 message = string_fmt_append(message, ": %s", strerror(basic_errno));
679 }
680 else
681 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
682
683 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
684 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
685 }
686
687 static void
688 msglog_line(host_item * host, uschar * message)
689 {
690 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
691 host->name, host->address, message);
692 }
693
694
695
696 #ifndef DISABLE_EVENT
697 /*************************************************
698 * Post-defer action *
699 *************************************************/
700
701 /* This expands an arbitrary per-transport string.
702 It might, for example, be used to write to the database log.
703
704 Arguments:
705 addr the address item containing error information
706 host the current host
707 evstr the event
708
709 Returns: nothing
710 */
711
712 static void
713 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
714 {
715 uschar * action = addr->transport->event_action;
716 const uschar * save_domain;
717 uschar * save_local;
718
719 if (!action)
720 return;
721
722 save_domain = deliver_domain;
723 save_local = deliver_localpart;
724
725 /*XXX would ip & port already be set up? */
726 deliver_host_address = string_copy(host->address);
727 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
728 event_defer_errno = addr->basic_errno;
729
730 router_name = addr->router->name;
731 transport_name = addr->transport->name;
732 deliver_domain = addr->domain;
733 deliver_localpart = addr->local_part;
734
735 (void) event_raise(action, evstr,
736 addr->message
737 ? addr->basic_errno > 0
738 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
739 : string_copy(addr->message)
740 : addr->basic_errno > 0
741 ? string_copy(US strerror(addr->basic_errno))
742 : NULL);
743
744 deliver_localpart = save_local;
745 deliver_domain = save_domain;
746 router_name = transport_name = NULL;
747 }
748 #endif
749
750 /*************************************************
751 * Reap SMTP specific responses *
752 *************************************************/
753 static int
754 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
755 int count)
756 {
757 uschar flushbuffer[4096];
758
759 while (count-- > 0)
760 {
761 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
762 '2', ob->command_timeout)
763 && (errno != 0 || flushbuffer[0] == 0))
764 break;
765 }
766 return count;
767 }
768
769
770 /* Return boolean success */
771
772 static BOOL
773 smtp_reap_banner(smtp_context * sx)
774 {
775 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
776 '2', (SOB sx->conn_args.ob)->command_timeout);
777 #ifdef EXPERIMENTAL_DSN_INFO
778 sx->smtp_greeting = string_copy(sx->buffer);
779 #endif
780 return good_response;
781 }
782
783 static BOOL
784 smtp_reap_ehlo(smtp_context * sx)
785 {
786 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
787 (SOB sx->conn_args.ob)->command_timeout))
788 {
789 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
790 {
791 #ifdef EXPERIMENTAL_DSN_INFO
792 sx->helo_response = string_copy(sx->buffer);
793 #endif
794 return FALSE;
795 }
796 sx->esmtp = FALSE;
797 }
798 #ifdef EXPERIMENTAL_DSN_INFO
799 sx->helo_response = string_copy(sx->buffer);
800 #endif
801 #ifndef DISABLE_EVENT
802 (void) event_raise(sx->conn_args.tblock->event_action,
803 US"smtp:ehlo", sx->buffer);
804 #endif
805 return TRUE;
806 }
807
808
809
810 #ifndef DISABLE_PIPE_CONNECT
811 static uschar *
812 ehlo_cache_key(const smtp_context * sx)
813 {
814 host_item * host = sx->conn_args.host;
815 return Ustrchr(host->address, ':')
816 ? string_sprintf("[%s]:%d.EHLO", host->address,
817 host->port == PORT_NONE ? sx->port : host->port)
818 : string_sprintf("%s:%d.EHLO", host->address,
819 host->port == PORT_NONE ? sx->port : host->port);
820 }
821
822 static void
823 write_ehlo_cache_entry(const smtp_context * sx)
824 {
825 open_db dbblock, * dbm_file;
826
827 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
828 {
829 uschar * ehlo_resp_key = ehlo_cache_key(sx);
830 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
831
832 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
833 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
834 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
835
836 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
837 dbfn_close(dbm_file);
838 }
839 }
840
841 static void
842 invalidate_ehlo_cache_entry(smtp_context * sx)
843 {
844 open_db dbblock, * dbm_file;
845
846 if ( sx->early_pipe_active
847 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
848 {
849 uschar * ehlo_resp_key = ehlo_cache_key(sx);
850 dbfn_delete(dbm_file, ehlo_resp_key);
851 dbfn_close(dbm_file);
852 }
853 }
854
855 static BOOL
856 read_ehlo_cache_entry(smtp_context * sx)
857 {
858 open_db dbblock;
859 open_db * dbm_file;
860
861 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
862 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
863 else
864 {
865 uschar * ehlo_resp_key = ehlo_cache_key(sx);
866 dbdata_ehlo_resp * er;
867
868 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
869 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
870 else if (time(NULL) - er->time_stamp > retry_data_expire)
871 {
872 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
873 dbfn_close(dbm_file);
874 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
875 dbfn_delete(dbm_file, ehlo_resp_key);
876 }
877 else
878 {
879 sx->ehlo_resp = er->data;
880 dbfn_close(dbm_file);
881 DEBUG(D_transport) debug_printf(
882 "EHLO response bits from cache: cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
883 er->data.cleartext_features, er->data.cleartext_auths,
884 er->data.crypted_features, er->data.crypted_auths);
885 return TRUE;
886 }
887 dbfn_close(dbm_file);
888 }
889 return FALSE;
890 }
891
892
893
894 /* Return an auths bitmap for the set of AUTH methods offered by the server
895 which match our authenticators. */
896
897 static unsigned short
898 study_ehlo_auths(smtp_context * sx)
899 {
900 uschar * names;
901 auth_instance * au;
902 uschar authnum;
903 unsigned short authbits = 0;
904
905 if (!sx->esmtp) return 0;
906 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
907 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
908 expand_nmax = -1; /* reset */
909 names = string_copyn(expand_nstring[1], expand_nlength[1]);
910
911 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
912 {
913 const uschar * list = names;
914 uschar * s;
915 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
916 if (strcmpic(au->public_name, s) == 0)
917 { authbits |= BIT(authnum); break; }
918 }
919
920 DEBUG(D_transport)
921 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
922 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
923
924 if (tls_out.active.sock >= 0)
925 sx->ehlo_resp.crypted_auths = authbits;
926 else
927 sx->ehlo_resp.cleartext_auths = authbits;
928 return authbits;
929 }
930
931
932
933
934 /* Wait for and check responses for early-pipelining.
935
936 Called from the lower-level smtp_read_response() function
937 used for general code that assume synchronisation, if context
938 flags indicate outstanding early-pipelining commands. Also
939 called fom sync_responses() which handles pipelined commands.
940
941 Arguments:
942 sx smtp connection context
943 countp number of outstanding responses, adjusted on return
944
945 Return:
946 OK all well
947 DEFER error on first read of TLS'd conn
948 FAIL SMTP error in response
949 */
950 int
951 smtp_reap_early_pipe(smtp_context * sx, int * countp)
952 {
953 BOOL pending_BANNER = sx->pending_BANNER;
954 BOOL pending_EHLO = sx->pending_EHLO;
955 int rc = FAIL;
956
957 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
958 sx->pending_EHLO = FALSE;
959
960 if (pending_BANNER)
961 {
962 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
963 (*countp)--;
964 if (!smtp_reap_banner(sx))
965 {
966 DEBUG(D_transport) debug_printf("bad banner\n");
967 if (tls_out.active.sock >= 0) rc = DEFER;
968 goto fail;
969 }
970 }
971
972 if (pending_EHLO)
973 {
974 unsigned peer_offered;
975 unsigned short authbits = 0, * ap;
976
977 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
978 (*countp)--;
979 if (!smtp_reap_ehlo(sx))
980 {
981 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
982 if (tls_out.active.sock >= 0) rc = DEFER;
983 goto fail;
984 }
985
986 /* Compare the actual EHLO response to the cached value we assumed;
987 on difference, dump or rewrite the cache and arrange for a retry. */
988
989 ap = tls_out.active.sock < 0
990 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
991
992 peer_offered = ehlo_response(sx->buffer,
993 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
994 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
995 | OPTION_UTF8 | OPTION_EARLY_PIPE
996 );
997 if ( peer_offered != sx->peer_offered
998 || (authbits = study_ehlo_auths(sx)) != *ap)
999 {
1000 HDEBUG(D_transport)
1001 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1002 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1003 sx->peer_offered, *ap, peer_offered, authbits);
1004 *(tls_out.active.sock < 0
1005 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1006 *ap = authbits;
1007 if (peer_offered & OPTION_EARLY_PIPE)
1008 write_ehlo_cache_entry(sx);
1009 else
1010 invalidate_ehlo_cache_entry(sx);
1011
1012 return OK; /* just carry on */
1013 }
1014 }
1015 return OK;
1016
1017 fail:
1018 invalidate_ehlo_cache_entry(sx);
1019 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1020 return rc;
1021 }
1022 #endif
1023
1024
1025 /*************************************************
1026 * Synchronize SMTP responses *
1027 *************************************************/
1028
1029 /* This function is called from smtp_deliver() to receive SMTP responses from
1030 the server, and match them up with the commands to which they relate. When
1031 PIPELINING is not in use, this function is called after every command, and is
1032 therefore somewhat over-engineered, but it is simpler to use a single scheme
1033 that works both with and without PIPELINING instead of having two separate sets
1034 of code.
1035
1036 The set of commands that are buffered up with pipelining may start with MAIL
1037 and may end with DATA; in between are RCPT commands that correspond to the
1038 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1039 etc.) are never buffered.
1040
1041 Errors after MAIL or DATA abort the whole process leaving the response in the
1042 buffer. After MAIL, pending responses are flushed, and the original command is
1043 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1044 permitted to reject some recipient addresses while accepting others. However
1045 certain errors clearly abort the whole process. Set the value in
1046 transport_return to PENDING_OK if the address is accepted. If there is a
1047 subsequent general error, it will get reset accordingly. If not, it will get
1048 converted to OK at the end.
1049
1050 Arguments:
1051 sx smtp connection context
1052 count the number of responses to read
1053 pending_DATA 0 if last command sent was not DATA
1054 +1 if previously had a good recipient
1055 -1 if not previously had a good recipient
1056
1057 Returns: 3 if at least one address had 2xx and one had 5xx
1058 2 if at least one address had 5xx but none had 2xx
1059 1 if at least one host had a 2xx response, but none had 5xx
1060 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1061 -1 timeout while reading RCPT response
1062 -2 I/O or other non-response error for RCPT
1063 -3 DATA or MAIL failed - errno and buffer set
1064 -4 banner or EHLO failed (early-pipelining)
1065 -5 banner or EHLO failed (early-pipelining, TLS)
1066 */
1067
1068 static int
1069 sync_responses(smtp_context * sx, int count, int pending_DATA)
1070 {
1071 address_item * addr = sx->sync_addr;
1072 smtp_transport_options_block * ob = sx->conn_args.ob;
1073 int yield = 0;
1074
1075 #ifndef DISABLE_PIPE_CONNECT
1076 int rc;
1077 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1078 return rc == FAIL ? -4 : -5;
1079 #endif
1080
1081 /* Handle the response for a MAIL command. On error, reinstate the original
1082 command in big_buffer for error message use, and flush any further pending
1083 responses before returning, except after I/O errors and timeouts. */
1084
1085 if (sx->pending_MAIL)
1086 {
1087 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1088 count--;
1089 sx->pending_MAIL = FALSE;
1090 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1091 '2', ob->command_timeout))
1092 {
1093 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1094 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1095 if (errno == ERRNO_TLSFAILURE)
1096 return -5;
1097 if (errno == 0 && sx->buffer[0] != 0)
1098 {
1099 int save_errno = 0;
1100 if (sx->buffer[0] == '4')
1101 {
1102 save_errno = ERRNO_MAIL4XX;
1103 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1104 }
1105 count = smtp_discard_responses(sx, ob, count);
1106 errno = save_errno;
1107 }
1108
1109 if (pending_DATA) count--; /* Number of RCPT responses to come */
1110 while (count-- > 0) /* Mark any pending addrs with the host used */
1111 {
1112 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1113 addr->host_used = sx->conn_args.host;
1114 addr = addr->next;
1115 }
1116 return -3;
1117 }
1118 }
1119
1120 if (pending_DATA) count--; /* Number of RCPT responses to come */
1121
1122 /* Read and handle the required number of RCPT responses, matching each one up
1123 with an address by scanning for the next address whose status is PENDING_DEFER.
1124 */
1125
1126 while (count-- > 0)
1127 {
1128 while (addr->transport_return != PENDING_DEFER)
1129 if (!(addr = addr->next))
1130 return -2;
1131
1132 /* The address was accepted */
1133 addr->host_used = sx->conn_args.host;
1134
1135 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1136 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1137 '2', ob->command_timeout))
1138 {
1139 yield |= 1;
1140 addr->transport_return = PENDING_OK;
1141
1142 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1143 ensure that any address-specific retry record is expunged. We do this both
1144 for the basic key and for the version that also includes the sender. */
1145
1146 if (testflag(addr, af_dr_retry_exists))
1147 {
1148 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1149 sender_address);
1150 retry_add_item(addr, altkey, rf_delete);
1151 retry_add_item(addr, addr->address_retry_key, rf_delete);
1152 }
1153 }
1154
1155 /* Error on first TLS read */
1156
1157 else if (errno == ERRNO_TLSFAILURE)
1158 return -5;
1159
1160 /* Timeout while reading the response */
1161
1162 else if (errno == ETIMEDOUT)
1163 {
1164 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1165 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1166 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1167 retry_add_item(addr, addr->address_retry_key, 0);
1168 update_waiting = FALSE;
1169 return -1;
1170 }
1171
1172 /* Handle other errors in obtaining an SMTP response by returning -1. This
1173 will cause all the addresses to be deferred. Restore the SMTP command in
1174 big_buffer for which we are checking the response, so the error message
1175 makes sense. */
1176
1177 else if (errno != 0 || sx->buffer[0] == 0)
1178 {
1179 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1180
1181 /* Use taint-unchecked routines for writing into big_buffer, trusting
1182 that we'll never expand it. */
1183
1184 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1185 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1186 string_from_gstring(g);
1187 return -2;
1188 }
1189
1190 /* Handle SMTP permanent and temporary response codes. */
1191
1192 else
1193 {
1194 addr->message =
1195 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1196 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1197 string_printing(sx->buffer));
1198 setflag(addr, af_pass_message);
1199 if (!sx->verify)
1200 msglog_line(sx->conn_args.host, addr->message);
1201
1202 /* The response was 5xx */
1203
1204 if (sx->buffer[0] == '5')
1205 {
1206 addr->transport_return = FAIL;
1207 yield |= 2;
1208 }
1209
1210 /* The response was 4xx */
1211
1212 else
1213 {
1214 addr->transport_return = DEFER;
1215 addr->basic_errno = ERRNO_RCPT4XX;
1216 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1217
1218 if (!sx->verify)
1219 {
1220 #ifndef DISABLE_EVENT
1221 event_defer_errno = addr->more_errno;
1222 msg_event_raise(US"msg:rcpt:host:defer", addr);
1223 #endif
1224 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1225 start point for another MAIL command. */
1226
1227 if (addr->more_errno >> 8 == 52 && yield & 3)
1228 {
1229 if (!sx->RCPT_452)
1230 {
1231 DEBUG(D_transport)
1232 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1233 sx->RCPT_452 = TRUE;
1234 sx->next_addr = addr;
1235 }
1236 addr->transport_return = PENDING_DEFER;
1237 addr->basic_errno = 0;
1238 }
1239 else
1240 {
1241 /* Log temporary errors if there are more hosts to be tried.
1242 If not, log this last one in the == line. */
1243
1244 if (sx->conn_args.host->next)
1245 if (LOGGING(outgoing_port))
1246 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1247 sx->conn_args.host->address,
1248 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1249 else
1250 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1251 sx->conn_args.host->address, addr->message);
1252
1253 #ifndef DISABLE_EVENT
1254 else
1255 msg_event_raise(US"msg:rcpt:defer", addr);
1256 #endif
1257
1258 /* Do not put this message on the list of those waiting for specific
1259 hosts, as otherwise it is likely to be tried too often. */
1260
1261 update_waiting = FALSE;
1262
1263 /* Add a retry item for the address so that it doesn't get tried again
1264 too soon. If address_retry_include_sender is true, add the sender address
1265 to the retry key. */
1266
1267 retry_add_item(addr,
1268 ob->address_retry_include_sender
1269 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1270 : addr->address_retry_key,
1271 0);
1272 }
1273 }
1274 }
1275 }
1276 } /* Loop for next RCPT response */
1277
1278 /* Update where to start at for the next block of responses, unless we
1279 have already handled all the addresses. */
1280
1281 if (addr) sx->sync_addr = addr->next;
1282
1283 /* Handle a response to DATA. If we have not had any good recipients, either
1284 previously or in this block, the response is ignored. */
1285
1286 if (pending_DATA != 0)
1287 {
1288 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1289 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1290 '3', ob->command_timeout))
1291 {
1292 int code;
1293 uschar *msg;
1294 BOOL pass_message;
1295
1296 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1297 return -5;
1298
1299 if (pending_DATA > 0 || (yield & 1) != 0)
1300 {
1301 if (errno == 0 && sx->buffer[0] == '4')
1302 {
1303 errno = ERRNO_DATA4XX;
1304 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1305 }
1306 return -3;
1307 }
1308 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1309 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1310 "is in use and there were no good recipients\n", msg);
1311 }
1312 }
1313
1314 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1315 present) received 3xx. If any RCPTs were handled and yielded anything other
1316 than 4xx, yield will be set non-zero. */
1317
1318 return yield;
1319 }
1320
1321
1322
1323
1324
1325 /* Try an authenticator's client entry */
1326
1327 static int
1328 try_authenticator(smtp_context * sx, auth_instance * au)
1329 {
1330 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1331 host_item * host = sx->conn_args.host; /* host to deliver to */
1332 int rc;
1333
1334 sx->outblock.authenticating = TRUE;
1335 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1336 sx->buffer, sizeof(sx->buffer));
1337 sx->outblock.authenticating = FALSE;
1338 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1339
1340 /* A temporary authentication failure must hold up delivery to
1341 this host. After a permanent authentication failure, we carry on
1342 to try other authentication methods. If all fail hard, try to
1343 deliver the message unauthenticated unless require_auth was set. */
1344
1345 switch(rc)
1346 {
1347 case OK:
1348 f.smtp_authenticated = TRUE; /* stops the outer loop */
1349 client_authenticator = au->name;
1350 if (au->set_client_id)
1351 client_authenticated_id = expand_string(au->set_client_id);
1352 break;
1353
1354 /* Failure after writing a command */
1355
1356 case FAIL_SEND:
1357 return FAIL_SEND;
1358
1359 /* Failure after reading a response */
1360
1361 case FAIL:
1362 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1363 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1364 au->name, host->name, host->address, sx->buffer);
1365 break;
1366
1367 /* Failure by some other means. In effect, the authenticator
1368 decided it wasn't prepared to handle this case. Typically this
1369 is the result of "fail" in an expansion string. Do we need to
1370 log anything here? Feb 2006: a message is now put in the buffer
1371 if logging is required. */
1372
1373 case CANCELLED:
1374 if (*sx->buffer != 0)
1375 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1376 "authentication H=%s [%s] %s", au->name, host->name,
1377 host->address, sx->buffer);
1378 break;
1379
1380 /* Internal problem, message in buffer. */
1381
1382 case ERROR:
1383 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1384 DEFER, FALSE, &sx->delivery_start);
1385 return ERROR;
1386 }
1387 return OK;
1388 }
1389
1390
1391
1392
1393 /* Do the client side of smtp-level authentication.
1394
1395 Arguments:
1396 sx smtp connection context
1397
1398 sx->buffer should have the EHLO response from server (gets overwritten)
1399
1400 Returns:
1401 OK Success, or failed (but not required): global "smtp_authenticated" set
1402 DEFER Failed authentication (and was required)
1403 ERROR Internal problem
1404
1405 FAIL_SEND Failed communications - transmit
1406 FAIL - response
1407 */
1408
1409 static int
1410 smtp_auth(smtp_context * sx)
1411 {
1412 host_item * host = sx->conn_args.host; /* host to deliver to */
1413 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1414 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1415 #ifndef DISABLE_PIPE_CONNECT
1416 unsigned short authbits = tls_out.active.sock >= 0
1417 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1418 #endif
1419 uschar * fail_reason = US"server did not advertise AUTH support";
1420
1421 f.smtp_authenticated = FALSE;
1422 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1423
1424 if (!regex_AUTH)
1425 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1426
1427 /* Is the server offering AUTH? */
1428
1429 if ( sx->esmtp
1430 &&
1431 #ifndef DISABLE_PIPE_CONNECT
1432 sx->early_pipe_active ? authbits
1433 :
1434 #endif
1435 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1436 )
1437 {
1438 uschar * names = NULL;
1439 expand_nmax = -1; /* reset */
1440
1441 #ifndef DISABLE_PIPE_CONNECT
1442 if (!sx->early_pipe_active)
1443 #endif
1444 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1445
1446 /* Must not do this check until after we have saved the result of the
1447 regex match above as the check could be another RE. */
1448
1449 if ( require_auth == OK
1450 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1451 {
1452 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1453 fail_reason = US"no common mechanisms were found";
1454
1455 #ifndef DISABLE_PIPE_CONNECT
1456 if (sx->early_pipe_active)
1457 {
1458 /* Scan our authenticators (which support use by a client and were offered
1459 by the server (checked at cache-write time)), not suppressed by
1460 client_condition. If one is found, attempt to authenticate by calling its
1461 client function. We are limited to supporting up to 16 authenticator
1462 public-names by the number of bits in a short. */
1463
1464 auth_instance * au;
1465 uschar bitnum;
1466 int rc;
1467
1468 for (bitnum = 0, au = auths;
1469 !f.smtp_authenticated && au && bitnum < 16;
1470 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1471 {
1472 if ( au->client_condition
1473 && !expand_check_condition(au->client_condition, au->name,
1474 US"client authenticator"))
1475 {
1476 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1477 au->name, "client_condition is false");
1478 continue;
1479 }
1480
1481 /* Found data for a listed mechanism. Call its client entry. Set
1482 a flag in the outblock so that data is overwritten after sending so
1483 that reflections don't show it. */
1484
1485 fail_reason = US"authentication attempt(s) failed";
1486
1487 if ((rc = try_authenticator(sx, au)) != OK)
1488 return rc;
1489 }
1490 }
1491 else
1492 #endif
1493
1494 /* Scan the configured authenticators looking for one which is configured
1495 for use as a client, which is not suppressed by client_condition, and
1496 whose name matches an authentication mechanism supported by the server.
1497 If one is found, attempt to authenticate by calling its client function.
1498 */
1499
1500 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1501 {
1502 uschar *p = names;
1503
1504 if ( !au->client
1505 || ( au->client_condition
1506 && !expand_check_condition(au->client_condition, au->name,
1507 US"client authenticator")))
1508 {
1509 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1510 au->name,
1511 (au->client)? "client_condition is false" :
1512 "not configured as a client");
1513 continue;
1514 }
1515
1516 /* Loop to scan supported server mechanisms */
1517
1518 while (*p)
1519 {
1520 int len = Ustrlen(au->public_name);
1521 int rc;
1522
1523 while (isspace(*p)) p++;
1524
1525 if (strncmpic(au->public_name, p, len) != 0 ||
1526 (p[len] != 0 && !isspace(p[len])))
1527 {
1528 while (*p != 0 && !isspace(*p)) p++;
1529 continue;
1530 }
1531
1532 /* Found data for a listed mechanism. Call its client entry. Set
1533 a flag in the outblock so that data is overwritten after sending so
1534 that reflections don't show it. */
1535
1536 fail_reason = US"authentication attempt(s) failed";
1537
1538 if ((rc = try_authenticator(sx, au)) != OK)
1539 return rc;
1540
1541 break; /* If not authenticated, try next authenticator */
1542 } /* Loop for scanning supported server mechanisms */
1543 } /* Loop for further authenticators */
1544 }
1545 }
1546
1547 /* If we haven't authenticated, but are required to, give up. */
1548
1549 if (require_auth == OK && !f.smtp_authenticated)
1550 {
1551 invalidate_ehlo_cache_entry(sx);
1552 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1553 string_sprintf("authentication required but %s", fail_reason), DEFER,
1554 FALSE, &sx->delivery_start);
1555 return DEFER;
1556 }
1557
1558 return OK;
1559 }
1560
1561
1562 /* Construct AUTH appendix string for MAIL TO */
1563 /*
1564 Arguments
1565 sx context for smtp connection
1566 p point in sx->buffer to build string
1567 addrlist chain of potential addresses to deliver
1568
1569 Globals f.smtp_authenticated
1570 client_authenticated_sender
1571 Return True on error, otherwise buffer has (possibly empty) terminated string
1572 */
1573
1574 static BOOL
1575 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1576 {
1577 smtp_transport_options_block * ob = sx->conn_args.ob;
1578 uschar * local_authenticated_sender = authenticated_sender;
1579
1580 #ifdef notdef
1581 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1582 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1583 #endif
1584
1585 if (ob->authenticated_sender)
1586 {
1587 uschar * new = expand_string(ob->authenticated_sender);
1588 if (!new)
1589 {
1590 if (!f.expand_string_forcedfail)
1591 {
1592 uschar *message = string_sprintf("failed to expand "
1593 "authenticated_sender: %s", expand_string_message);
1594 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1595 return TRUE;
1596 }
1597 }
1598 else if (*new)
1599 local_authenticated_sender = new;
1600 }
1601
1602 /* Add the authenticated sender address if present */
1603
1604 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1605 && local_authenticated_sender)
1606 {
1607 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1608 auth_xtextencode(local_authenticated_sender,
1609 Ustrlen(local_authenticated_sender)));
1610 client_authenticated_sender = string_copy(local_authenticated_sender);
1611 }
1612 else
1613 *p = 0;
1614
1615 return FALSE;
1616 }
1617
1618
1619
1620 typedef struct smtp_compare_s
1621 {
1622 uschar *current_sender_address;
1623 struct transport_instance *tblock;
1624 } smtp_compare_t;
1625
1626
1627 /* Create a unique string that identifies this message, it is based on
1628 sender_address, helo_data and tls_certificate if enabled.
1629 */
1630
1631 static uschar *
1632 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1633 {
1634 address_item * addr1;
1635 uschar * if1 = US"";
1636 uschar * helo1 = US"";
1637 #ifndef DISABLE_TLS
1638 uschar * tlsc1 = US"";
1639 #endif
1640 uschar * save_sender_address = sender_address;
1641 uschar * local_identity = NULL;
1642 smtp_transport_options_block * ob = SOB tblock->options_block;
1643
1644 sender_address = sender;
1645
1646 addr1 = deliver_make_addr (sender, TRUE);
1647 deliver_set_expansions(addr1);
1648
1649 if (ob->interface)
1650 if1 = expand_string(ob->interface);
1651
1652 if (ob->helo_data)
1653 helo1 = expand_string(ob->helo_data);
1654
1655 #ifndef DISABLE_TLS
1656 if (ob->tls_certificate)
1657 tlsc1 = expand_string(ob->tls_certificate);
1658 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1659 #else
1660 local_identity = string_sprintf ("%s^%s", if1, helo1);
1661 #endif
1662
1663 deliver_set_expansions(NULL);
1664 sender_address = save_sender_address;
1665
1666 return local_identity;
1667 }
1668
1669
1670
1671 /* This routine is a callback that is called from transport_check_waiting.
1672 This function will evaluate the incoming message versus the previous
1673 message. If the incoming message is using a different local identity then
1674 we will veto this new message. */
1675
1676 static BOOL
1677 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1678 {
1679 uschar * message_local_identity,
1680 * current_local_identity,
1681 * new_sender_address;
1682
1683 current_local_identity =
1684 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1685
1686 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1687 return FALSE;
1688
1689 message_local_identity =
1690 smtp_local_identity(new_sender_address, s_compare->tblock);
1691
1692 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1693 }
1694
1695
1696
1697 static unsigned
1698 ehlo_response(uschar * buf, unsigned checks)
1699 {
1700 size_t bsize = Ustrlen(buf);
1701
1702 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1703
1704 #ifndef DISABLE_TLS
1705 if ( checks & OPTION_TLS
1706 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1707 #endif
1708 checks &= ~OPTION_TLS;
1709
1710 if ( checks & OPTION_IGNQ
1711 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1712 PCRE_EOPT, NULL, 0) < 0)
1713 checks &= ~OPTION_IGNQ;
1714
1715 if ( checks & OPTION_CHUNKING
1716 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1717 checks &= ~OPTION_CHUNKING;
1718
1719 #ifndef DISABLE_PRDR
1720 if ( checks & OPTION_PRDR
1721 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1722 #endif
1723 checks &= ~OPTION_PRDR;
1724
1725 #ifdef SUPPORT_I18N
1726 if ( checks & OPTION_UTF8
1727 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1728 #endif
1729 checks &= ~OPTION_UTF8;
1730
1731 if ( checks & OPTION_DSN
1732 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1733 checks &= ~OPTION_DSN;
1734
1735 if ( checks & OPTION_PIPE
1736 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1737 PCRE_EOPT, NULL, 0) < 0)
1738 checks &= ~OPTION_PIPE;
1739
1740 if ( checks & OPTION_SIZE
1741 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1742 checks &= ~OPTION_SIZE;
1743
1744 #ifndef DISABLE_PIPE_CONNECT
1745 if ( checks & OPTION_EARLY_PIPE
1746 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1747 PCRE_EOPT, NULL, 0) < 0)
1748 #endif
1749 checks &= ~OPTION_EARLY_PIPE;
1750
1751 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1752 return checks;
1753 }
1754
1755
1756
1757 /* Callback for emitting a BDAT data chunk header.
1758
1759 If given a nonzero size, first flush any buffered SMTP commands
1760 then emit the command.
1761
1762 Reap previous SMTP command responses if requested, and always reap
1763 the response from a previous BDAT command.
1764
1765 Args:
1766 tctx transport context
1767 chunk_size value for SMTP BDAT command
1768 flags
1769 tc_chunk_last add LAST option to SMTP BDAT command
1770 tc_reap_prev reap response to previous SMTP commands
1771
1772 Returns:
1773 OK or ERROR
1774 DEFER TLS error on first read (EHLO-resp); errno set
1775 */
1776
1777 static int
1778 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1779 unsigned flags)
1780 {
1781 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1782 smtp_context * sx = tctx->smtp_context;
1783 int cmd_count = 0;
1784 int prev_cmd_count;
1785
1786 /* Write SMTP chunk header command. If not reaping responses, note that
1787 there may be more writes (like, the chunk data) done soon. */
1788
1789 if (chunk_size > 0)
1790 {
1791 #ifndef DISABLE_PIPE_CONNECT
1792 BOOL new_conn = !!(sx->outblock.conn_args);
1793 #endif
1794 if((cmd_count = smtp_write_command(sx,
1795 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1796 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1797 ) < 0) return ERROR;
1798 if (flags & tc_chunk_last)
1799 data_command = string_copy(big_buffer); /* Save for later error message */
1800 #ifndef DISABLE_PIPE_CONNECT
1801 /* That command write could have been the one that made the connection.
1802 Copy the fd from the client conn ctx (smtp transport specific) to the
1803 generic transport ctx. */
1804
1805 if (new_conn)
1806 tctx->u.fd = sx->outblock.cctx->sock;
1807 #endif
1808 }
1809
1810 prev_cmd_count = cmd_count += sx->cmd_count;
1811
1812 /* Reap responses for any previous, but not one we just emitted */
1813
1814 if (chunk_size > 0)
1815 prev_cmd_count--;
1816 if (sx->pending_BDAT)
1817 prev_cmd_count--;
1818
1819 if (flags & tc_reap_prev && prev_cmd_count > 0)
1820 {
1821 DEBUG(D_transport) debug_printf("look for %d responses"
1822 " for previous pipelined cmds\n", prev_cmd_count);
1823
1824 switch(sync_responses(sx, prev_cmd_count, 0))
1825 {
1826 case 1: /* 2xx (only) => OK */
1827 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1828 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1829 case 0: break; /* No 2xx or 5xx, but no probs */
1830
1831 case -5: errno = ERRNO_TLSFAILURE;
1832 return DEFER;
1833 #ifndef DISABLE_PIPE_CONNECT
1834 case -4: /* non-2xx for pipelined banner or EHLO */
1835 #endif
1836 case -1: /* Timeout on RCPT */
1837 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1838 }
1839 cmd_count = 1;
1840 if (!sx->pending_BDAT)
1841 pipelining_active = FALSE;
1842 }
1843
1844 /* Reap response for an outstanding BDAT */
1845
1846 if (sx->pending_BDAT)
1847 {
1848 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1849
1850 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1851 ob->command_timeout))
1852 {
1853 if (errno == 0 && sx->buffer[0] == '4')
1854 {
1855 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1856 sx->addrlist->more_errno |=
1857 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1858 }
1859 return ERROR;
1860 }
1861 cmd_count--;
1862 sx->pending_BDAT = FALSE;
1863 pipelining_active = FALSE;
1864 }
1865 else if (chunk_size > 0)
1866 sx->pending_BDAT = TRUE;
1867
1868
1869 sx->cmd_count = cmd_count;
1870 return OK;
1871 }
1872
1873
1874
1875
1876
1877 /*************************************************
1878 * Make connection for given message *
1879 *************************************************/
1880
1881 /*
1882 Arguments:
1883 ctx connection context
1884 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1885 a second attempt after TLS initialization fails
1886
1887 Returns: OK - the connection was made and the delivery attempted;
1888 fd is set in the conn context, tls_out set up.
1889 DEFER - the connection could not be made, or something failed
1890 while setting up the SMTP session, or there was a
1891 non-message-specific error, such as a timeout.
1892 ERROR - helo_data or add_headers or authenticated_sender is
1893 specified for this transport, and the string failed
1894 to expand
1895 */
1896 int
1897 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1898 {
1899 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1900 BOOL pass_message = FALSE;
1901 uschar * message = NULL;
1902 int yield = OK;
1903 #ifndef DISABLE_TLS
1904 uschar * tls_errstr;
1905 #endif
1906
1907 sx->conn_args.ob = ob;
1908
1909 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1910 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1911 /* sx->ok = FALSE; */
1912 sx->send_rset = TRUE;
1913 sx->send_quit = TRUE;
1914 sx->setting_up = TRUE;
1915 sx->esmtp = TRUE;
1916 /* sx->esmtp_sent = FALSE; */
1917 #ifdef SUPPORT_I18N
1918 /* sx->utf8_needed = FALSE; */
1919 #endif
1920 sx->dsn_all_lasthop = TRUE;
1921 #ifdef SUPPORT_DANE
1922 /* sx->conn_args.dane = FALSE; */
1923 sx->dane_required =
1924 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1925 #endif
1926 #ifndef DISABLE_PIPE_CONNECT
1927 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
1928 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
1929 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
1930 #endif
1931
1932 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1933 /* sx->peer_offered = 0; */
1934 /* sx->avoid_option = 0; */
1935 sx->igquotstr = US"";
1936 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1937 #ifdef EXPERIMENTAL_DSN_INFO
1938 /* sx->smtp_greeting = NULL; */
1939 /* sx->helo_response = NULL; */
1940 #endif
1941
1942 smtp_command = US"initial connection";
1943 /* sx->buffer[0] = '\0'; */
1944
1945 /* Set up the buffer for reading SMTP response packets. */
1946
1947 sx->inblock.buffer = sx->inbuffer;
1948 sx->inblock.buffersize = sizeof(sx->inbuffer);
1949 sx->inblock.ptr = sx->inbuffer;
1950 sx->inblock.ptrend = sx->inbuffer;
1951
1952 /* Set up the buffer for holding SMTP commands while pipelining */
1953
1954 sx->outblock.buffer = sx->outbuffer;
1955 sx->outblock.buffersize = sizeof(sx->outbuffer);
1956 sx->outblock.ptr = sx->outbuffer;
1957 /* sx->outblock.cmd_count = 0; */
1958 /* sx->outblock.authenticating = FALSE; */
1959 /* sx->outblock.conn_args = NULL; */
1960
1961 /* Reset the parameters of a TLS session. */
1962
1963 tls_out.bits = 0;
1964 tls_out.cipher = NULL; /* the one we may use for this transport */
1965 tls_out.ourcert = NULL;
1966 tls_out.peercert = NULL;
1967 tls_out.peerdn = NULL;
1968 #ifdef USE_OPENSSL
1969 tls_out.sni = NULL;
1970 #endif
1971 tls_out.ocsp = OCSP_NOT_REQ;
1972 #ifdef EXPERIMENTAL_TLS_RESUME
1973 tls_out.resumption = 0;
1974 #endif
1975 tls_out.ver = NULL;
1976
1977 /* Flip the legacy TLS-related variables over to the outbound set in case
1978 they're used in the context of the transport. Don't bother resetting
1979 afterward (when being used by a transport) as we're in a subprocess.
1980 For verify, unflipped once the callout is dealt with */
1981
1982 tls_modify_variables(&tls_out);
1983
1984 #ifdef DISABLE_TLS
1985 if (sx->smtps)
1986 {
1987 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1988 DEFER, FALSE, &sx->delivery_start);
1989 return ERROR;
1990 }
1991 #endif
1992
1993 /* Make a connection to the host if this isn't a continued delivery, and handle
1994 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1995 specially so they can be identified for retries. */
1996
1997 if (!continue_hostname)
1998 {
1999 if (sx->verify)
2000 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2001
2002 /* Get the actual port the connection will use, into sx->conn_args.host */
2003
2004 smtp_port_for_connect(sx->conn_args.host, sx->port);
2005
2006 #ifdef SUPPORT_DANE
2007 /* Do TLSA lookup for DANE */
2008 {
2009 tls_out.dane_verified = FALSE;
2010 tls_out.tlsa_usage = 0;
2011
2012 if (sx->conn_args.host->dnssec == DS_YES)
2013 {
2014 int rc;
2015 if( sx->dane_required
2016 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2017 )
2018 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2019 {
2020 case OK: sx->conn_args.dane = TRUE;
2021 ob->tls_tempfail_tryclear = FALSE;
2022 break;
2023 case FAIL_FORCED: break;
2024 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2025 string_sprintf("DANE error: tlsa lookup %s",
2026 rc_to_string(rc)),
2027 rc, FALSE, &sx->delivery_start);
2028 # ifndef DISABLE_EVENT
2029 (void) event_raise(sx->conn_args.tblock->event_action,
2030 US"dane:fail", sx->dane_required
2031 ? US"dane-required" : US"dnssec-invalid");
2032 # endif
2033 return rc;
2034 }
2035 }
2036 else if (sx->dane_required)
2037 {
2038 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2039 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2040 FAIL, FALSE, &sx->delivery_start);
2041 # ifndef DISABLE_EVENT
2042 (void) event_raise(sx->conn_args.tblock->event_action,
2043 US"dane:fail", US"dane-required");
2044 # endif
2045 return FAIL;
2046 }
2047 }
2048 #endif /*DANE*/
2049
2050 /* Make the TCP connection */
2051
2052 sx->cctx.tls_ctx = NULL;
2053 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2054 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2055
2056 #ifndef DISABLE_PIPE_CONNECT
2057 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2058 sx->conn_args.host) == OK)
2059
2060 /* We don't find out the local ip address until the connect, so if
2061 the helo string might use it avoid doing early-pipelining. */
2062
2063 if ( !sx->helo_data
2064 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2065 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2066 )
2067 {
2068 sx->early_pipe_ok = TRUE;
2069 if ( read_ehlo_cache_entry(sx)
2070 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2071 {
2072 DEBUG(D_transport)
2073 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2074 sx->early_pipe_active = TRUE;
2075 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2076 }
2077 }
2078 else DEBUG(D_transport)
2079 debug_printf("helo needs $sending_ip_address\n");
2080
2081 PIPE_CONNECT_RETRY:
2082 if (sx->early_pipe_active)
2083 sx->outblock.conn_args = &sx->conn_args;
2084 else
2085 #endif
2086 {
2087 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2088 {
2089 set_errno_nohost(sx->addrlist,
2090 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2091 sx->verify ? US strerror(errno) : NULL,
2092 DEFER, FALSE, &sx->delivery_start);
2093 sx->send_quit = FALSE;
2094 return DEFER;
2095 }
2096 }
2097 /* Expand the greeting message while waiting for the initial response. (Makes
2098 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2099 delayed till here so that $sending_interface and $sending_port are set. */
2100 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2101 will be? Somehow I doubt it. */
2102
2103 if (sx->helo_data)
2104 if (!(sx->helo_data = expand_string(sx->helo_data)))
2105 if (sx->verify)
2106 log_write(0, LOG_MAIN|LOG_PANIC,
2107 "<%s>: failed to expand transport's helo_data value for callout: %s",
2108 sx->addrlist->address, expand_string_message);
2109
2110 #ifdef SUPPORT_I18N
2111 if (sx->helo_data)
2112 {
2113 expand_string_message = NULL;
2114 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2115 &expand_string_message)),
2116 expand_string_message)
2117 if (sx->verify)
2118 log_write(0, LOG_MAIN|LOG_PANIC,
2119 "<%s>: failed to expand transport's helo_data value for callout: %s",
2120 sx->addrlist->address, expand_string_message);
2121 else
2122 sx->helo_data = NULL;
2123 }
2124 #endif
2125
2126 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2127 is nevertheless a reasonably clean way of programming this kind of logic,
2128 where you want to escape on any error. */
2129
2130 if (!sx->smtps)
2131 {
2132 #ifndef DISABLE_PIPE_CONNECT
2133 if (sx->early_pipe_active)
2134 {
2135 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2136 sx->outblock.cmd_count = 1;
2137 }
2138 else
2139 #endif
2140 {
2141 #ifdef TCP_QUICKACK
2142 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2143 sizeof(off));
2144 #endif
2145 if (!smtp_reap_banner(sx))
2146 goto RESPONSE_FAILED;
2147 }
2148
2149 #ifndef DISABLE_EVENT
2150 {
2151 uschar * s;
2152 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2153 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2154 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2155 if (s)
2156 {
2157 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2158 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2159 DEFER, FALSE, &sx->delivery_start);
2160 yield = DEFER;
2161 goto SEND_QUIT;
2162 }
2163 }
2164 #endif
2165
2166 /* Now check if the helo_data expansion went well, and sign off cleanly if
2167 it didn't. */
2168
2169 if (!sx->helo_data)
2170 {
2171 message = string_sprintf("failed to expand helo_data: %s",
2172 expand_string_message);
2173 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2174 yield = DEFER;
2175 goto SEND_QUIT;
2176 }
2177 }
2178
2179 /** Debugging without sending a message
2180 sx->addrlist->transport_return = DEFER;
2181 goto SEND_QUIT;
2182 **/
2183
2184 /* Errors that occur after this point follow an SMTP command, which is
2185 left in big_buffer by smtp_write_command() for use in error messages. */
2186
2187 smtp_command = big_buffer;
2188
2189 /* Tell the remote who we are...
2190
2191 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2192 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2193 greeting is of this form. The assumption was that the far end supports it
2194 properly... but experience shows that there are some that give 5xx responses,
2195 even though the banner includes "ESMTP" (there's a bloody-minded one that
2196 says "ESMTP not spoken here"). Cope with that case.
2197
2198 September 2000: Time has passed, and it seems reasonable now to always send
2199 EHLO at the start. It is also convenient to make the change while installing
2200 the TLS stuff.
2201
2202 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2203 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2204 would be no way to send out the mails, so there is now a host list
2205 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2206 PIPELINING problem as well. Maybe it can also be useful to cure other
2207 problems with broken servers.
2208
2209 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2210 Then somebody tried it with a Microsoft mailer... It seems that all other
2211 mailers use upper case for some reason (the RFC is quite clear about case
2212 independence) so, for peace of mind, I gave in. */
2213
2214 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2215
2216 /* Alas; be careful, since this goto is not an error-out, so conceivably
2217 we might set data between here and the target which we assume to exist
2218 and be usable. I can see this coming back to bite us. */
2219 #ifndef DISABLE_TLS
2220 if (sx->smtps)
2221 {
2222 smtp_peer_options |= OPTION_TLS;
2223 suppress_tls = FALSE;
2224 ob->tls_tempfail_tryclear = FALSE;
2225 smtp_command = US"SSL-on-connect";
2226 goto TLS_NEGOTIATE;
2227 }
2228 #endif
2229
2230 if (sx->esmtp)
2231 {
2232 if (smtp_write_command(sx,
2233 #ifndef DISABLE_PIPE_CONNECT
2234 sx->early_pipe_active ? SCMD_BUFFER :
2235 #endif
2236 SCMD_FLUSH,
2237 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2238 goto SEND_FAILED;
2239 sx->esmtp_sent = TRUE;
2240
2241 #ifndef DISABLE_PIPE_CONNECT
2242 if (sx->early_pipe_active)
2243 {
2244 sx->pending_EHLO = TRUE;
2245
2246 /* If we have too many authenticators to handle and might need to AUTH
2247 for this transport, pipeline no further as we will need the
2248 list of auth methods offered. Reap the banner and EHLO. */
2249
2250 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2251 && f.smtp_in_early_pipe_no_auth)
2252 {
2253 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2254 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2255 goto SEND_FAILED;
2256 if (sync_responses(sx, 2, 0) != 0)
2257 {
2258 HDEBUG(D_transport)
2259 debug_printf("failed reaping pipelined cmd responses\n");
2260 goto RESPONSE_FAILED;
2261 }
2262 sx->early_pipe_active = FALSE;
2263 }
2264 }
2265 else
2266 #endif
2267 if (!smtp_reap_ehlo(sx))
2268 goto RESPONSE_FAILED;
2269 }
2270 else
2271 DEBUG(D_transport)
2272 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2273
2274 #ifndef DISABLE_PIPE_CONNECT
2275 if (!sx->early_pipe_active)
2276 #endif
2277 if (!sx->esmtp)
2278 {
2279 BOOL good_response;
2280 int n = sizeof(sx->buffer);
2281 uschar * rsp = sx->buffer;
2282
2283 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2284 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2285
2286 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2287 goto SEND_FAILED;
2288 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2289 #ifdef EXPERIMENTAL_DSN_INFO
2290 sx->helo_response = string_copy(rsp);
2291 #endif
2292 if (!good_response)
2293 {
2294 /* Handle special logging for a closed connection after HELO
2295 when had previously sent EHLO */
2296
2297 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2298 {
2299 errno = ERRNO_SMTPCLOSED;
2300 goto EHLOHELO_FAILED;
2301 }
2302 memmove(sx->buffer, rsp, Ustrlen(rsp));
2303 goto RESPONSE_FAILED;
2304 }
2305 }
2306
2307 if (sx->esmtp || sx->lmtp)
2308 {
2309 #ifndef DISABLE_PIPE_CONNECT
2310 if (!sx->early_pipe_active)
2311 #endif
2312 {
2313 sx->peer_offered = ehlo_response(sx->buffer,
2314 OPTION_TLS /* others checked later */
2315 #ifndef DISABLE_PIPE_CONNECT
2316 | (sx->early_pipe_ok
2317 ? OPTION_IGNQ
2318 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2319 #ifdef SUPPORT_I18N
2320 | OPTION_UTF8
2321 #endif
2322 | OPTION_EARLY_PIPE
2323 : 0
2324 )
2325 #endif
2326 );
2327 #ifndef DISABLE_PIPE_CONNECT
2328 if (sx->early_pipe_ok)
2329 {
2330 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2331
2332 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2333 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2334 {
2335 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2336 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2337 write_ehlo_cache_entry(sx);
2338 }
2339 }
2340 #endif
2341 }
2342
2343 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2344
2345 #ifndef DISABLE_TLS
2346 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2347 #endif
2348 }
2349 }
2350
2351 /* For continuing deliveries down the same channel, having re-exec'd the socket
2352 is the standard input; for a socket held open from verify it is recorded
2353 in the cutthrough context block. Either way we don't need to redo EHLO here
2354 (but may need to do so for TLS - see below).
2355 Set up the pointer to where subsequent commands will be left, for
2356 error messages. Note that smtp_peer_options will have been
2357 set from the command line if they were set in the process that passed the
2358 connection on. */
2359
2360 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2361 as the continue goes via transport_pass_socket() and doublefork and exec.
2362 It does not wait. Unclear how we keep separate host's responses
2363 separate - we could match up by host ip+port as a bodge. */
2364
2365 else
2366 {
2367 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2368 {
2369 sx->cctx = cutthrough.cctx;
2370 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2371 }
2372 else
2373 {
2374 sx->cctx.sock = 0; /* stdin */
2375 sx->cctx.tls_ctx = NULL;
2376 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2377 }
2378 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2379 smtp_command = big_buffer;
2380 sx->peer_offered = smtp_peer_options;
2381 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2382
2383 /* For a continued connection with TLS being proxied for us, or a
2384 held-open verify connection with TLS, nothing more to do. */
2385
2386 if ( continue_proxy_cipher
2387 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2388 && cutthrough.is_tls)
2389 )
2390 {
2391 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2392 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2393 continue_proxy_cipher ? "proxied" : "verify conn with");
2394 return OK;
2395 }
2396 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2397 }
2398
2399 /* If TLS is available on this connection, whether continued or not, attempt to
2400 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2401 send another EHLO - the server may give a different answer in secure mode. We
2402 use a separate buffer for reading the response to STARTTLS so that if it is
2403 negative, the original EHLO data is available for subsequent analysis, should
2404 the client not be required to use TLS. If the response is bad, copy the buffer
2405 for error analysis. */
2406
2407 #ifndef DISABLE_TLS
2408 if ( smtp_peer_options & OPTION_TLS
2409 && !suppress_tls
2410 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2411 && ( !sx->verify
2412 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2413 ) )
2414 {
2415 uschar buffer2[4096];
2416
2417 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2418 goto SEND_FAILED;
2419
2420 #ifndef DISABLE_PIPE_CONNECT
2421 /* If doing early-pipelining reap the banner and EHLO-response but leave
2422 the response for the STARTTLS we just sent alone. */
2423
2424 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2425 {
2426 HDEBUG(D_transport)
2427 debug_printf("failed reaping pipelined cmd responses\n");
2428 close(sx->cctx.sock);
2429 sx->cctx.sock = -1;
2430 sx->early_pipe_active = FALSE;
2431 goto PIPE_CONNECT_RETRY;
2432 }
2433 #endif
2434
2435 /* If there is an I/O error, transmission of this message is deferred. If
2436 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2437 false, we also defer. However, if there is a temporary rejection of STARTTLS
2438 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2439 STARTTLS, we carry on. This means we will try to send the message in clear,
2440 unless the host is in hosts_require_tls (tested below). */
2441
2442 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2443 {
2444 if ( errno != 0
2445 || buffer2[0] == 0
2446 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2447 )
2448 {
2449 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2450 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2451 goto RESPONSE_FAILED;
2452 }
2453 }
2454
2455 /* STARTTLS accepted: try to negotiate a TLS session. */
2456
2457 else
2458 TLS_NEGOTIATE:
2459 {
2460 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2461 {
2462 /* TLS negotiation failed; give an error. From outside, this function may
2463 be called again to try in clear on a new connection, if the options permit
2464 it for this host. */
2465 #ifdef USE_GNUTLS
2466 GNUTLS_CONN_FAILED:
2467 #endif
2468 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2469
2470 # ifdef SUPPORT_DANE
2471 if (sx->conn_args.dane)
2472 {
2473 log_write(0, LOG_MAIN,
2474 "DANE attempt failed; TLS connection to %s [%s]: %s",
2475 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2476 # ifndef DISABLE_EVENT
2477 (void) event_raise(sx->conn_args.tblock->event_action,
2478 US"dane:fail", US"validation-failure"); /* could do with better detail */
2479 # endif
2480 }
2481 # endif
2482
2483 errno = ERRNO_TLSFAILURE;
2484 message = string_sprintf("TLS session: %s", tls_errstr);
2485 sx->send_quit = FALSE;
2486 goto TLS_FAILED;
2487 }
2488
2489 /* TLS session is set up */
2490
2491 smtp_peer_options_wrap = smtp_peer_options;
2492 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2493 if (addr->transport_return == PENDING_DEFER)
2494 {
2495 addr->cipher = tls_out.cipher;
2496 addr->ourcert = tls_out.ourcert;
2497 addr->peercert = tls_out.peercert;
2498 addr->peerdn = tls_out.peerdn;
2499 addr->ocsp = tls_out.ocsp;
2500 addr->tlsver = tls_out.ver;
2501 }
2502 }
2503 }
2504
2505 /* if smtps, we'll have smtp_command set to something else; always safe to
2506 reset it here. */
2507 smtp_command = big_buffer;
2508
2509 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2510 helo_data is null, we are dealing with a connection that was passed from
2511 another process, and so we won't have expanded helo_data above. We have to
2512 expand it here. $sending_ip_address and $sending_port are set up right at the
2513 start of the Exim process (in exim.c). */
2514
2515 if (tls_out.active.sock >= 0)
2516 {
2517 uschar * greeting_cmd;
2518
2519 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2520 {
2521 uschar *message = string_sprintf("failed to expand helo_data: %s",
2522 expand_string_message);
2523 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2524 yield = DEFER;
2525 goto SEND_QUIT;
2526 }
2527
2528 #ifndef DISABLE_PIPE_CONNECT
2529 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2530 We're unlikely to get the group sent and delivered before the server sends its
2531 banner, but it's still worth sending as a group.
2532 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2533 the reverse. */
2534
2535 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2536 {
2537 sx->peer_offered = sx->ehlo_resp.crypted_features;
2538 if ((sx->early_pipe_active =
2539 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2540 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2541 }
2542 #endif
2543
2544 /* For SMTPS we need to wait for the initial OK response. */
2545 if (sx->smtps)
2546 #ifndef DISABLE_PIPE_CONNECT
2547 if (sx->early_pipe_active)
2548 {
2549 sx->pending_BANNER = TRUE;
2550 sx->outblock.cmd_count = 1;
2551 }
2552 else
2553 #endif
2554 if (!smtp_reap_banner(sx))
2555 goto RESPONSE_FAILED;
2556
2557 if (sx->lmtp)
2558 greeting_cmd = US"LHLO";
2559 else if (sx->esmtp)
2560 greeting_cmd = US"EHLO";
2561 else
2562 {
2563 greeting_cmd = US"HELO";
2564 DEBUG(D_transport)
2565 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2566 }
2567
2568 if (smtp_write_command(sx,
2569 #ifndef DISABLE_PIPE_CONNECT
2570 sx->early_pipe_active ? SCMD_BUFFER :
2571 #endif
2572 SCMD_FLUSH,
2573 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2574 goto SEND_FAILED;
2575
2576 #ifndef DISABLE_PIPE_CONNECT
2577 if (sx->early_pipe_active)
2578 sx->pending_EHLO = TRUE;
2579 else
2580 #endif
2581 {
2582 if (!smtp_reap_ehlo(sx))
2583 #ifdef USE_GNUTLS
2584 {
2585 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2586 cert late, under TLS1.3 - which means here; the first time we try to
2587 receive crypted data. Treat it as if it was a connect-time failure.
2588 See also the early-pipe equivalent... which will be hard; every call
2589 to sync_responses will need to check the result.
2590 It would be nicer to have GnuTLS check the cert during the handshake.
2591 Can it do that, with all the flexibility we need? */
2592
2593 tls_errstr = US"error on first read";
2594 goto GNUTLS_CONN_FAILED;
2595 }
2596 #else
2597 goto RESPONSE_FAILED;
2598 #endif
2599 smtp_peer_options = 0;
2600 }
2601 }
2602
2603 /* If the host is required to use a secure channel, ensure that we
2604 have one. */
2605
2606 else if ( sx->smtps
2607 # ifdef SUPPORT_DANE
2608 || sx->conn_args.dane
2609 # endif
2610 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2611 )
2612 {
2613 errno = ERRNO_TLSREQUIRED;
2614 message = string_sprintf("a TLS session is required, but %s",
2615 smtp_peer_options & OPTION_TLS
2616 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2617 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2618 if (sx->conn_args.dane)
2619 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2620 smtp_peer_options & OPTION_TLS
2621 ? US"validation-failure" /* could do with better detail */
2622 : US"starttls-not-supported");
2623 # endif
2624 goto TLS_FAILED;
2625 }
2626 #endif /*DISABLE_TLS*/
2627
2628 /* If TLS is active, we have just started it up and re-done the EHLO command,
2629 so its response needs to be analyzed. If TLS is not active and this is a
2630 continued session down a previously-used socket, we haven't just done EHLO, so
2631 we skip this. */
2632
2633 if (continue_hostname == NULL
2634 #ifndef DISABLE_TLS
2635 || tls_out.active.sock >= 0
2636 #endif
2637 )
2638 {
2639 if (sx->esmtp || sx->lmtp)
2640 {
2641 #ifndef DISABLE_PIPE_CONNECT
2642 if (!sx->early_pipe_active)
2643 #endif
2644 {
2645 sx->peer_offered = ehlo_response(sx->buffer,
2646 0 /* no TLS */
2647 #ifndef DISABLE_PIPE_CONNECT
2648 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2649 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2650 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2651 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2652
2653 #else
2654
2655 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2656 | OPTION_CHUNKING
2657 | OPTION_PRDR
2658 # ifdef SUPPORT_I18N
2659 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2660 /*XXX if we hand peercaps on to continued-conn processes,
2661 must not depend on this addr */
2662 # endif
2663 | OPTION_DSN
2664 | OPTION_PIPE
2665 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2666 #endif
2667 );
2668 #ifndef DISABLE_PIPE_CONNECT
2669 if (tls_out.active.sock >= 0)
2670 sx->ehlo_resp.crypted_features = sx->peer_offered;
2671 #endif
2672 }
2673
2674 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2675 lmtp_ignore_quota option was set. */
2676
2677 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2678
2679 /* If the response to EHLO specified support for the SIZE parameter, note
2680 this, provided size_addition is non-negative. */
2681
2682 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2683
2684 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2685 the current host, esmtp will be false, so PIPELINING can never be used. If
2686 the current host matches hosts_avoid_pipelining, don't do it. */
2687
2688 if ( sx->peer_offered & OPTION_PIPE
2689 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2690 smtp_peer_options |= OPTION_PIPE;
2691
2692 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2693 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2694
2695 if ( sx->peer_offered & OPTION_CHUNKING
2696 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2697 sx->peer_offered &= ~OPTION_CHUNKING;
2698
2699 if (sx->peer_offered & OPTION_CHUNKING)
2700 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2701
2702 #ifndef DISABLE_PRDR
2703 if ( sx->peer_offered & OPTION_PRDR
2704 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2705 sx->peer_offered &= ~OPTION_PRDR;
2706
2707 if (sx->peer_offered & OPTION_PRDR)
2708 DEBUG(D_transport) debug_printf("PRDR usable\n");
2709 #endif
2710
2711 /* Note if the server supports DSN */
2712 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2713 DEBUG(D_transport) debug_printf("%susing DSN\n",
2714 sx->peer_offered & OPTION_DSN ? "" : "not ");
2715
2716 #ifndef DISABLE_PIPE_CONNECT
2717 if ( sx->early_pipe_ok
2718 && !sx->early_pipe_active
2719 && tls_out.active.sock >= 0
2720 && smtp_peer_options & OPTION_PIPE
2721 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2722 & OPTION_EARLY_PIPE)
2723 {
2724 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2725 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2726 write_ehlo_cache_entry(sx);
2727 }
2728 #endif
2729
2730 /* Note if the response to EHLO specifies support for the AUTH extension.
2731 If it has, check that this host is one we want to authenticate to, and do
2732 the business. The host name and address must be available when the
2733 authenticator's client driver is running. */
2734
2735 switch (yield = smtp_auth(sx))
2736 {
2737 default: goto SEND_QUIT;
2738 case OK: break;
2739 case FAIL_SEND: goto SEND_FAILED;
2740 case FAIL: goto RESPONSE_FAILED;
2741 }
2742 }
2743 }
2744 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2745
2746 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2747 message-specific. */
2748
2749 sx->setting_up = FALSE;
2750
2751 #ifdef SUPPORT_I18N
2752 if (sx->addrlist->prop.utf8_msg)
2753 {
2754 uschar * s;
2755
2756 /* If the transport sets a downconversion mode it overrides any set by ACL
2757 for the message. */
2758
2759 if ((s = ob->utf8_downconvert))
2760 {
2761 if (!(s = expand_string(s)))
2762 {
2763 message = string_sprintf("failed to expand utf8_downconvert: %s",
2764 expand_string_message);
2765 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2766 yield = DEFER;
2767 goto SEND_QUIT;
2768 }
2769 switch (*s)
2770 {
2771 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2772 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2773 break;
2774 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2775 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2776 break;
2777 case '-': if (s[1] == '1')
2778 {
2779 sx->addrlist->prop.utf8_downcvt = FALSE;
2780 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2781 }
2782 break;
2783 }
2784 }
2785
2786 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2787 && !sx->addrlist->prop.utf8_downcvt_maybe;
2788 DEBUG(D_transport) if (!sx->utf8_needed)
2789 debug_printf("utf8: %s downconvert\n",
2790 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2791 }
2792
2793 /* If this is an international message we need the host to speak SMTPUTF8 */
2794 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2795 {
2796 errno = ERRNO_UTF8_FWD;
2797 goto RESPONSE_FAILED;
2798 }
2799 #endif /*SUPPORT_I18N*/
2800
2801 return OK;
2802
2803
2804 {
2805 int code;
2806
2807 RESPONSE_FAILED:
2808 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2809 {
2810 /* There is a testing facility for simulating a connection timeout, as I
2811 can't think of any other way of doing this. It converts a connection
2812 refused into a timeout if the timeout is set to 999999. This is done for
2813 a 3whs connection in ip_connect(), but a TFO connection does not error
2814 there - instead it gets ECONNREFUSED on the first data read. Tracking
2815 that a TFO really was done is too hard, or we would set a
2816 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2817 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2818 cmd-timeout. */
2819
2820 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2821 errno = ETIMEDOUT;
2822 set_errno_nohost(sx->addrlist,
2823 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2824 sx->verify ? US strerror(errno) : NULL,
2825 DEFER, FALSE, &sx->delivery_start);
2826 sx->send_quit = FALSE;
2827 return DEFER;
2828 }
2829
2830 /* really an error on an SMTP read */
2831 message = NULL;
2832 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2833 sx->buffer, &code, &message, &pass_message);
2834 yield = DEFER;
2835 goto FAILED;
2836
2837 SEND_FAILED:
2838 code = '4';
2839 message = US string_sprintf("send() to %s [%s] failed: %s",
2840 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2841 sx->send_quit = FALSE;
2842 yield = DEFER;
2843 goto FAILED;
2844
2845 EHLOHELO_FAILED:
2846 code = '4';
2847 message = string_sprintf("Remote host closed connection in response to %s"
2848 " (EHLO response was: %s)", smtp_command, sx->buffer);
2849 sx->send_quit = FALSE;
2850 yield = DEFER;
2851 goto FAILED;
2852
2853 /* This label is jumped to directly when a TLS negotiation has failed,
2854 or was not done for a host for which it is required. Values will be set
2855 in message and errno, and setting_up will always be true. Treat as
2856 a temporary error. */
2857
2858 #ifndef DISABLE_TLS
2859 TLS_FAILED:
2860 code = '4', yield = DEFER;
2861 goto FAILED;
2862 #endif
2863
2864 /* The failure happened while setting up the call; see if the failure was
2865 a 5xx response (this will either be on connection, or following HELO - a 5xx
2866 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2867 fail all addresses, as this host is never going to accept them. For other
2868 errors during setting up (timeouts or whatever), defer all addresses, and
2869 yield DEFER, so that the host is not tried again for a while.
2870
2871 XXX This peeking for another host feels like a layering violation. We want
2872 to note the host as unusable, but down here we shouldn't know if this was
2873 the last host to try for the addr(list). Perhaps the upper layer should be
2874 the one to do set_errno() ? The problem is that currently the addr is where
2875 errno etc. are stashed, but until we run out of hosts to try the errors are
2876 host-specific. Maybe we should enhance the host_item definition? */
2877
2878 FAILED:
2879 sx->ok = FALSE; /* For when reached by GOTO */
2880 set_errno(sx->addrlist, errno, message,
2881 sx->conn_args.host->next
2882 ? DEFER
2883 : code == '5'
2884 #ifdef SUPPORT_I18N
2885 || errno == ERRNO_UTF8_FWD
2886 #endif
2887 ? FAIL : DEFER,
2888 pass_message,
2889 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
2890 #ifdef EXPERIMENTAL_DSN_INFO
2891 sx->smtp_greeting, sx->helo_response,
2892 #endif
2893 &sx->delivery_start);
2894 }
2895
2896
2897 SEND_QUIT:
2898
2899 if (sx->send_quit)
2900 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2901
2902 #ifndef DISABLE_TLS
2903 if (sx->cctx.tls_ctx)
2904 {
2905 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2906 sx->cctx.tls_ctx = NULL;
2907 }
2908 #endif
2909
2910 /* Close the socket, and return the appropriate value, first setting
2911 works because the NULL setting is passed back to the calling process, and
2912 remote_max_parallel is forced to 1 when delivering over an existing connection,
2913 */
2914
2915 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2916 if (sx->send_quit)
2917 {
2918 shutdown(sx->cctx.sock, SHUT_WR);
2919 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2920 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2921 i--; /* drain socket */
2922 sx->send_quit = FALSE;
2923 }
2924 (void)close(sx->cctx.sock);
2925 sx->cctx.sock = -1;
2926
2927 #ifndef DISABLE_EVENT
2928 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2929 #endif
2930
2931 continue_transport = NULL;
2932 continue_hostname = NULL;
2933 return yield;
2934 }
2935
2936
2937
2938
2939 /* Create the string of options that will be appended to the MAIL FROM:
2940 in the connection context buffer */
2941
2942 static int
2943 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2944 {
2945 uschar * p = sx->buffer;
2946 address_item * addr;
2947 int address_count;
2948
2949 *p = 0;
2950
2951 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2952 send it, adding something to the message size to allow for imprecision
2953 and things that get added en route. Exim keeps the number of lines
2954 in a message, so we can give an accurate value for the original message, but we
2955 need some additional to handle added headers. (Double "." characters don't get
2956 included in the count.) */
2957
2958 if ( message_size > 0
2959 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2960 {
2961 /*XXX problem here under spool_files_wireformat?
2962 Or just forget about lines? Or inflate by a fixed proportion? */
2963
2964 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2965 while (*p) p++;
2966 }
2967
2968 #ifndef DISABLE_PRDR
2969 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2970 request that */
2971
2972 sx->prdr_active = FALSE;
2973 if (sx->peer_offered & OPTION_PRDR)
2974 for (address_item * addr = addrlist; addr; addr = addr->next)
2975 if (addr->transport_return == PENDING_DEFER)
2976 {
2977 for (addr = addr->next; addr; addr = addr->next)
2978 if (addr->transport_return == PENDING_DEFER)
2979 { /* at least two recipients to send */
2980 sx->prdr_active = TRUE;
2981 sprintf(CS p, " PRDR"); p += 5;
2982 break;
2983 }
2984 break;
2985 }
2986 #endif
2987
2988 #ifdef SUPPORT_I18N
2989 /* If it supports internationalised messages, and this meesage need that,
2990 request it */
2991
2992 if ( sx->peer_offered & OPTION_UTF8
2993 && addrlist->prop.utf8_msg
2994 && !addrlist->prop.utf8_downcvt
2995 )
2996 Ustrcpy(p, US" SMTPUTF8"), p += 9;
2997 #endif
2998
2999 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3000 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3001 addr && address_count < sx->max_rcpt;
3002 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3003 {
3004 address_count++;
3005 if (!(addr->dsn_flags & rf_dsnlasthop))
3006 {
3007 sx->dsn_all_lasthop = FALSE;
3008 break;
3009 }
3010 }
3011
3012 /* Add any DSN flags to the mail command */
3013
3014 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3015 {
3016 if (dsn_ret == dsn_ret_hdrs)
3017 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3018 else if (dsn_ret == dsn_ret_full)
3019 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3020
3021 if (dsn_envid)
3022 {
3023 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3024 while (*p) p++;
3025 }
3026 }
3027
3028 /* If an authenticated_sender override has been specified for this transport
3029 instance, expand it. If the expansion is forced to fail, and there was already
3030 an authenticated_sender for this message, the original value will be used.
3031 Other expansion failures are serious. An empty result is ignored, but there is
3032 otherwise no check - this feature is expected to be used with LMTP and other
3033 cases where non-standard addresses (e.g. without domains) might be required. */
3034
3035 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3036 }
3037
3038
3039 static void
3040 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3041 {
3042 uschar * p = sx->buffer;
3043 *p = 0;
3044
3045 /* Add any DSN flags to the rcpt command */
3046
3047 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3048 {
3049 if (addr->dsn_flags & rf_dsnflags)
3050 {
3051 BOOL first = TRUE;
3052
3053 Ustrcpy(p, US" NOTIFY=");
3054 while (*p) p++;
3055 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3056 {
3057 if (!first) *p++ = ',';
3058 first = FALSE;
3059 Ustrcpy(p, rf_names[i]);
3060 while (*p) p++;
3061 }
3062 }
3063
3064 if (addr->dsn_orcpt)
3065 {
3066 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3067 addr->dsn_orcpt);
3068 while (*p) p++;
3069 }
3070 }
3071 }
3072
3073
3074
3075 /*
3076 Return:
3077 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3078 -1 MAIL response error
3079 -2 any non-MAIL read i/o error
3080 -3 non-MAIL response timeout
3081 -4 internal error; channel still usable
3082 -5 transmit failed
3083 */
3084
3085 int
3086 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3087 {
3088 address_item * addr;
3089 int address_count, pipe_limit;
3090 int rc;
3091
3092 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3093 {
3094 *yield = ERROR;
3095 return -4;
3096 }
3097
3098 /* From here until we send the DATA command, we can make use of PIPELINING
3099 if the server host supports it. The code has to be able to check the responses
3100 at any point, for when the buffer fills up, so we write it totally generally.
3101 When PIPELINING is off, each command written reports that it has flushed the
3102 buffer. */
3103
3104 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3105
3106 {
3107 uschar * s = sx->from_addr;
3108 #ifdef SUPPORT_I18N
3109 uschar * errstr = NULL;
3110
3111 /* If we must downconvert, do the from-address here. Remember we had to
3112 for the to-addresses (done below), and also (ugly) for re-doing when building
3113 the delivery log line. */
3114
3115 if ( sx->addrlist->prop.utf8_msg
3116 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3117 )
3118 {
3119 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3120 {
3121 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3122 *yield = ERROR;
3123 return -4;
3124 }
3125 setflag(sx->addrlist, af_utf8_downcvt);
3126 }
3127 #endif
3128
3129 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3130 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3131 }
3132
3133 mail_command = string_copy(big_buffer); /* Save for later error message */
3134
3135 switch(rc)
3136 {
3137 case -1: /* Transmission error */
3138 return -5;
3139
3140 case +1: /* Cmd was sent */
3141 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3142 (SOB sx->conn_args.ob)->command_timeout))
3143 {
3144 if (errno == 0 && sx->buffer[0] == '4')
3145 {
3146 errno = ERRNO_MAIL4XX;
3147 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3148 }
3149 return -1;
3150 }
3151 sx->pending_MAIL = FALSE;
3152 break;
3153
3154 /* otherwise zero: command queued for pipeline */
3155 }
3156
3157 /* Pass over all the relevant recipient addresses for this host, which are the
3158 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3159 several before we have to read the responses for those seen so far. This
3160 checking is done by a subroutine because it also needs to be done at the end.
3161 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3162 the next one if not all are sent.
3163
3164 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3165 last address because we want to abort if any recipients have any kind of
3166 problem, temporary or permanent. We know that all recipient addresses will have
3167 the PENDING_DEFER status, because only one attempt is ever made, and we know
3168 that max_rcpt will be large, so all addresses will be done at once.
3169
3170 For verify we flush the pipeline after any (the only) rcpt address. */
3171
3172 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3173 addr && address_count < sx->max_rcpt;
3174 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3175 {
3176 int cmds_sent;
3177 BOOL no_flush;
3178 uschar * rcpt_addr;
3179
3180 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3181 ? dsn_support_yes : dsn_support_no;
3182
3183 address_count++;
3184 if (pipe_limit-- <= 0)
3185 { no_flush = FALSE; pipe_limit = 100; }
3186 else
3187 no_flush = pipelining_active && !sx->verify
3188 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3189
3190 build_rcptcmd_options(sx, addr);
3191
3192 /* Now send the RCPT command, and process outstanding responses when
3193 necessary. After a timeout on RCPT, we just end the function, leaving the
3194 yield as OK, because this error can often mean that there is a problem with
3195 just one address, so we don't want to delay the host. */
3196
3197 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3198
3199 #ifdef SUPPORT_I18N
3200 if ( testflag(sx->addrlist, af_utf8_downcvt)
3201 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3202 )
3203 {
3204 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3205 errno = ERRNO_EXPANDFAIL;
3206 return -5; /*XXX too harsh? */
3207 }
3208 #endif
3209
3210 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3211 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3212
3213 if (cmds_sent < 0) return -5;
3214 if (cmds_sent > 0)
3215 {
3216 switch(sync_responses(sx, cmds_sent, 0))
3217 {
3218 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3219 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3220 break;
3221
3222 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3223 if (!sx->lmtp) /* can't tell about progress yet */
3224 sx->completed_addr = TRUE;
3225 case 0: /* No 2xx or 5xx, but no probs */
3226 /* If any RCPT got a 452 response then next_addr has been updated
3227 for restarting with a new MAIL on the same connection. Send no more
3228 RCPTs for this MAIL. */
3229
3230 if (sx->RCPT_452)
3231 {
3232 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3233 sx->RCPT_452 = FALSE;
3234 /* sx->next_addr has been reset for fast_retry */
3235 return 0;
3236 }
3237 break;
3238
3239 case -1: return -3; /* Timeout on RCPT */
3240 case -2: return -2; /* non-MAIL read i/o error */
3241 default: return -1; /* any MAIL error */
3242
3243 #ifndef DISABLE_PIPE_CONNECT
3244 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3245 case -5: return -1; /* TLS first-read error */
3246 #endif
3247 }
3248 }
3249 } /* Loop for next address */
3250
3251 sx->next_addr = addr;
3252 return 0;
3253 }
3254
3255
3256 #ifndef DISABLE_TLS
3257 /*****************************************************
3258 * Proxy TLS connection for another transport process *
3259 ******************************************************/
3260 /*
3261 Close the unused end of the pipe, fork once more, then use the given buffer
3262 as a staging area, and select on both the given fd and the TLS'd client-fd for
3263 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3264 Do blocking full-size writes, and reads under a timeout. Once both input
3265 channels are closed, exit the process.
3266
3267 Arguments:
3268 ct_ctx tls context
3269 buf space to use for buffering
3270 bufsiz size of buffer
3271 pfd pipe filedescriptor array; [0] is comms to proxied process
3272 timeout per-read timeout, seconds
3273
3274 Does not return.
3275 */
3276
3277 void
3278 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3279 int timeout)
3280 {
3281 fd_set rfds, efds;
3282 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3283 int rc, i;
3284
3285 close(pfd[1]);
3286 if ((rc = exim_fork(US"tls-proxy")))
3287 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3288
3289 set_process_info("proxying TLS connection for continued transport");
3290 FD_ZERO(&rfds);
3291 FD_SET(tls_out.active.sock, &rfds);
3292 FD_SET(pfd[0], &rfds);
3293
3294 for (int fd_bits = 3; fd_bits; )
3295 {
3296 time_t time_left = timeout;
3297 time_t time_start = time(NULL);
3298
3299 /* wait for data */
3300 efds = rfds;
3301 do
3302 {
3303 struct timeval tv = { time_left, 0 };
3304
3305 rc = select(max_fd,
3306 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3307
3308 if (rc < 0 && errno == EINTR)
3309 if ((time_left -= time(NULL) - time_start) > 0) continue;
3310
3311 if (rc <= 0)
3312 {
3313 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3314 goto done;
3315 }
3316
3317 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3318 {
3319 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3320 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3321 goto done;
3322 }
3323 }
3324 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3325
3326 /* handle inbound data */
3327 if (FD_ISSET(tls_out.active.sock, &rfds))
3328 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3329 {
3330 fd_bits &= ~1;
3331 FD_CLR(tls_out.active.sock, &rfds);
3332 shutdown(pfd[0], SHUT_WR);
3333 timeout = 5;
3334 }
3335 else
3336 {
3337 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3338 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3339 }
3340 else if (fd_bits & 1)
3341 FD_SET(tls_out.active.sock, &rfds);
3342
3343 /* handle outbound data */
3344 if (FD_ISSET(pfd[0], &rfds))
3345 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3346 {
3347 fd_bits = 0;
3348 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3349 ct_ctx = NULL;
3350 }
3351 else
3352 {
3353 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3354 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3355 goto done;
3356 }
3357 else if (fd_bits & 2)
3358 FD_SET(pfd[0], &rfds);
3359 }
3360
3361 done:
3362 testharness_pause_ms(100); /* let logging complete */
3363 exim_exit(EXIT_SUCCESS);
3364 }
3365 #endif
3366
3367
3368 /*************************************************
3369 * Deliver address list to given host *
3370 *************************************************/
3371
3372 /* If continue_hostname is not null, we get here only when continuing to
3373 deliver down an existing channel. The channel was passed as the standard
3374 input. TLS is never active on a passed channel; the previous process either
3375 closes it down before passing the connection on, or inserts a TLS-proxy
3376 process and passes on a cleartext conection.
3377
3378 Otherwise, we have to make a connection to the remote host, and do the
3379 initial protocol exchange.
3380
3381 When running as an MUA wrapper, if the sender or any recipient is rejected,
3382 temporarily or permanently, we force failure for all recipients.
3383
3384 Arguments:
3385 addrlist chain of potential addresses to deliver; only those whose
3386 transport_return field is set to PENDING_DEFER are currently
3387 being processed; others should be skipped - they have either
3388 been delivered to an earlier host or IP address, or been
3389 failed by one of them.
3390 host host to deliver to
3391 host_af AF_INET or AF_INET6
3392 defport default TCP/IP port to use if host does not specify, in host
3393 byte order
3394 interface interface to bind to, or NULL
3395 tblock transport instance block
3396 message_defer set TRUE if yield is OK, but all addresses were deferred
3397 because of a non-recipient, non-host failure, that is, a
3398 4xx response to MAIL FROM, DATA, or ".". This is a defer
3399 that is specific to the message.
3400 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3401 a second attempt after TLS initialization fails
3402
3403 Returns: OK - the connection was made and the delivery attempted;
3404 the result for each address is in its data block.
3405 DEFER - the connection could not be made, or something failed
3406 while setting up the SMTP session, or there was a
3407 non-message-specific error, such as a timeout.
3408 ERROR - a filter command is specified for this transport,
3409 and there was a problem setting it up; OR helo_data
3410 or add_headers or authenticated_sender is specified
3411 for this transport, and the string failed to expand
3412
3413 For all non-OK returns the first addr of the list carries the
3414 time taken for the attempt.
3415 */
3416
3417 static int
3418 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3419 uschar *interface, transport_instance *tblock,
3420 BOOL *message_defer, BOOL suppress_tls)
3421 {
3422 smtp_transport_options_block * ob = SOB tblock->options_block;
3423 int yield = OK;
3424 int save_errno;
3425 int rc;
3426
3427 BOOL pass_message = FALSE;
3428 uschar *message = NULL;
3429 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3430 smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */
3431
3432 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3433 *message_defer = FALSE;
3434
3435 memset(sx, 0, sizeof(*sx));
3436 sx->addrlist = addrlist;
3437 sx->conn_args.host = host;
3438 sx->conn_args.host_af = host_af,
3439 sx->port = defport;
3440 sx->conn_args.interface = interface;
3441 sx->helo_data = NULL;
3442 sx->conn_args.tblock = tblock;
3443 /* sx->verify = FALSE; */
3444 gettimeofday(&sx->delivery_start, NULL);
3445 sx->sync_addr = sx->first_addr = addrlist;
3446
3447 /* Get the channel set up ready for a message (MAIL FROM being the next
3448 SMTP command to send */
3449
3450 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3451 {
3452 timesince(&addrlist->delivery_time, &sx->delivery_start);
3453 return rc;
3454 }
3455
3456 /* If there is a filter command specified for this transport, we can now
3457 set it up. This cannot be done until the identity of the host is known. */
3458
3459 if (tblock->filter_command)
3460 {
3461 transport_filter_timeout = tblock->filter_timeout;
3462
3463 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3464 yield ERROR. */
3465
3466 if (!transport_set_up_command(&transport_filter_argv,
3467 tblock->filter_command, TRUE, DEFER, addrlist,
3468 string_sprintf("%.50s transport", tblock->name), NULL))
3469 {
3470 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3471 FALSE, &sx->delivery_start);
3472 yield = ERROR;
3473 goto SEND_QUIT;
3474 }
3475
3476 if ( transport_filter_argv
3477 && *transport_filter_argv
3478 && **transport_filter_argv
3479 && sx->peer_offered & OPTION_CHUNKING
3480 #ifndef DISABLE_DKIM
3481 /* When dkim signing, chunking is handled even with a transport-filter */
3482 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3483 && !ob->dkim.force_bodyhash
3484 #endif
3485 )
3486 {
3487 sx->peer_offered &= ~OPTION_CHUNKING;
3488 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3489 }
3490 }
3491
3492 /* For messages that have more than the maximum number of envelope recipients,
3493 we want to send several transactions down the same SMTP connection. (See
3494 comments in deliver.c as to how this reconciles, heuristically, with
3495 remote_max_parallel.) This optimization was added to Exim after the following
3496 code was already working. The simplest way to put it in without disturbing the
3497 code was to use a goto to jump back to this point when there is another
3498 transaction to handle. */
3499
3500 SEND_MESSAGE:
3501 sx->from_addr = return_path;
3502 sx->sync_addr = sx->first_addr;
3503 sx->ok = FALSE;
3504 sx->send_rset = TRUE;
3505 sx->completed_addr = FALSE;
3506
3507
3508 /* If we are a continued-connection-after-verify the MAIL and RCPT
3509 commands were already sent; do not re-send but do mark the addrs as
3510 having been accepted up to RCPT stage. A traditional cont-conn
3511 always has a sequence number greater than one. */
3512
3513 if (continue_hostname && continue_sequence == 1)
3514 {
3515 /* sx->pending_MAIL = FALSE; */
3516 sx->ok = TRUE;
3517 /* sx->next_addr = NULL; */
3518
3519 for (address_item * addr = addrlist; addr; addr = addr->next)
3520 addr->transport_return = PENDING_OK;
3521 }
3522 else
3523 {
3524 /* Initiate a message transfer. */
3525
3526 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3527 {
3528 case 0: break;
3529 case -1: case -2: goto RESPONSE_FAILED;
3530 case -3: goto END_OFF;
3531 case -4: goto SEND_QUIT;
3532 default: goto SEND_FAILED;
3533 }
3534
3535 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3536 permanently or temporarily. We should have flushed and synced after the last
3537 RCPT. */
3538
3539 if (mua_wrapper)
3540 {
3541 address_item * a;
3542 unsigned cnt;
3543
3544 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3545 if (a->transport_return != PENDING_OK)
3546 {
3547 /*XXX could we find a better errno than 0 here? */
3548 set_errno_nohost(addrlist, 0, a->message, FAIL,
3549 testflag(a, af_pass_message), &sx->delivery_start);
3550 sx->ok = FALSE;
3551 break;
3552 }
3553 }
3554 }
3555
3556 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3557 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3558 have a good recipient buffered up if we are pipelining. We don't want to waste
3559 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3560 are pipelining. The responses are all handled by sync_responses().
3561 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3562 to send is. */
3563
3564 if ( !(sx->peer_offered & OPTION_CHUNKING)
3565 && (sx->ok || (pipelining_active && !mua_wrapper)))
3566 {
3567 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3568
3569 if (count < 0) goto SEND_FAILED;
3570 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3571 {
3572 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3573 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3574 break;
3575
3576 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3577 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3578 case 0: break; /* No 2xx or 5xx, but no probs */
3579
3580 case -1: goto END_OFF; /* Timeout on RCPT */
3581
3582 #ifndef DISABLE_PIPE_CONNECT
3583 case -5: /* TLS first-read error */
3584 case -4: HDEBUG(D_transport)
3585 debug_printf("failed reaping pipelined cmd responses\n");
3586 #endif
3587 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3588 }
3589 pipelining_active = FALSE;
3590 data_command = string_copy(big_buffer); /* Save for later error message */
3591 }
3592
3593 /* If there were no good recipients (but otherwise there have been no
3594 problems), just set ok TRUE, since we have handled address-specific errors
3595 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3596 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3597 well as body. Set the appropriate timeout value to be used for each chunk.
3598 (Haven't been able to make it work using select() for writing yet.) */
3599
3600 if ( !sx->ok
3601 && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active))
3602 {
3603 /* Save the first address of the next batch. */
3604 sx->first_addr = sx->next_addr;
3605
3606 sx->ok = TRUE;
3607 }
3608 else
3609 {
3610 transport_ctx tctx = {
3611 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3612 .tblock = tblock,
3613 .addr = addrlist,
3614 .check_string = US".",
3615 .escape_string = US"..", /* Escaping strings */
3616 .options =
3617 topt_use_crlf | topt_escape_headers
3618 | (tblock->body_only ? topt_no_headers : 0)
3619 | (tblock->headers_only ? topt_no_body : 0)
3620 | (tblock->return_path_add ? topt_add_return_path : 0)
3621 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3622 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3623 };
3624
3625 /* If using CHUNKING we need a callback from the generic transport
3626 support to us, for the sending of BDAT smtp commands and the reaping
3627 of responses. The callback needs a whole bunch of state so set up
3628 a transport-context structure to be passed around. */
3629
3630 if (sx->peer_offered & OPTION_CHUNKING)
3631 {
3632 tctx.check_string = tctx.escape_string = NULL;
3633 tctx.options |= topt_use_bdat;
3634 tctx.chunk_cb = smtp_chunk_cmd_callback;
3635 sx->pending_BDAT = FALSE;
3636 sx->good_RCPT = sx->ok;
3637 sx->cmd_count = 0;
3638 tctx.smtp_context = sx;
3639 }
3640 else
3641 tctx.options |= topt_end_dot;
3642
3643 /* Save the first address of the next batch. */
3644 sx->first_addr = sx->next_addr;
3645
3646 /* Responses from CHUNKING commands go in buffer. Otherwise,
3647 there has not been a response. */
3648
3649 sx->buffer[0] = 0;
3650
3651 sigalrm_seen = FALSE;
3652 transport_write_timeout = ob->data_timeout;
3653 smtp_command = US"sending data block"; /* For error messages */
3654 DEBUG(D_transport|D_v)
3655 if (sx->peer_offered & OPTION_CHUNKING)
3656 debug_printf(" will write message using CHUNKING\n");
3657 else
3658 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3659 transport_count = 0;
3660
3661 #ifndef DISABLE_DKIM
3662 {
3663 # ifdef MEASURE_TIMING
3664 struct timeval t0;
3665 gettimeofday(&t0, NULL);
3666 # endif
3667 dkim_exim_sign_init();
3668 # ifdef EXPERIMENTAL_ARC
3669 {
3670 uschar * s = ob->arc_sign;
3671 if (s)
3672 {
3673 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3674 {
3675 if (!f.expand_string_forcedfail)
3676 {
3677 message = US"failed to expand arc_sign";
3678 sx->ok = FALSE;
3679 goto SEND_FAILED;
3680 }
3681 }
3682 else if (*s)
3683 {
3684 /* Ask dkim code to hash the body for ARC */
3685 (void) arc_ams_setup_sign_bodyhash();
3686 ob->dkim.force_bodyhash = TRUE;
3687 }
3688 }
3689 }
3690 # endif
3691 # ifdef MEASURE_TIMING
3692 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
3693 # endif
3694 }
3695 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3696 #else
3697 sx->ok = transport_write_message(&tctx, 0);
3698 #endif
3699
3700 /* transport_write_message() uses write() because it is called from other
3701 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3702 it can exit with "Broken pipe" as its error. This really means that the
3703 socket got closed at the far end. */
3704
3705 transport_write_timeout = 0; /* for subsequent transports */
3706
3707 /* Failure can either be some kind of I/O disaster (including timeout),
3708 or the failure of a transport filter or the expansion of added headers.
3709 Or, when CHUNKING, it can be a protocol-detected failure. */
3710
3711 if (!sx->ok)
3712 if (message) goto SEND_FAILED;
3713 else goto RESPONSE_FAILED;
3714
3715 /* We used to send the terminating "." explicitly here, but because of
3716 buffering effects at both ends of TCP/IP connections, you don't gain
3717 anything by keeping it separate, so it might as well go in the final
3718 data buffer for efficiency. This is now done by setting the topt_end_dot
3719 flag above. */
3720
3721 smtp_command = US"end of data";
3722
3723 if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
3724 {
3725 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3726 switch(sync_responses(sx, sx->cmd_count-1, 0))
3727 {
3728 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3729 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3730 break;
3731
3732 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3733 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3734 case 0: break; /* No 2xx or 5xx, but no probs */
3735
3736 case -1: goto END_OFF; /* Timeout on RCPT */
3737
3738 #ifndef DISABLE_PIPE_CONNECT
3739 case -5: /* TLS first-read error */
3740 case -4: HDEBUG(D_transport)
3741 debug_printf("failed reaping pipelined cmd responses\n");
3742 #endif
3743 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3744 }
3745 }
3746
3747 #ifndef DISABLE_PRDR
3748 /* For PRDR we optionally get a partial-responses warning followed by the
3749 individual responses, before going on with the overall response. If we don't
3750 get the warning then deal with per non-PRDR. */
3751
3752 if(sx->prdr_active)
3753 {
3754 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
3755 if (!sx->ok && errno == 0) switch(sx->buffer[0])
3756 {
3757 case '2': sx->prdr_active = FALSE;
3758 sx->ok = TRUE;
3759 break;
3760 case '4': errno = ERRNO_DATA4XX;
3761 addrlist->more_errno |=
3762 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3763 break;
3764 }
3765 }
3766 else
3767 #endif
3768
3769 /* For non-PRDR SMTP, we now read a single response that applies to the
3770 whole message. If it is OK, then all the addresses have been delivered. */
3771
3772 if (!sx->lmtp)
3773 {
3774 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3775 ob->final_timeout);
3776 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
3777 {
3778 errno = ERRNO_DATA4XX;
3779 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3780 }
3781 }
3782
3783 /* For LMTP, we get back a response for every RCPT command that we sent;
3784 some may be accepted and some rejected. For those that get a response, their
3785 status is fixed; any that are accepted have been handed over, even if later
3786 responses crash - at least, that's how I read RFC 2033.
3787
3788 If all went well, mark the recipient addresses as completed, record which
3789 host/IPaddress they were delivered to, and cut out RSET when sending another
3790 message down the same channel. Write the completed addresses to the journal
3791 now so that they are recorded in case there is a crash of hardware or
3792 software before the spool gets updated. Also record the final SMTP
3793 confirmation if needed (for SMTP only). */
3794
3795 if (sx->ok)
3796 {
3797 int flag = '=';
3798 struct timeval delivery_time;
3799 int len;
3800 uschar * conf = NULL;
3801
3802 timesince(&delivery_time, &sx->delivery_start);
3803 sx->send_rset = FALSE;
3804 pipelining_active = FALSE;
3805
3806 /* Set up confirmation if needed - applies only to SMTP */
3807
3808 if (
3809 #ifdef DISABLE_EVENT
3810 LOGGING(smtp_confirmation) &&
3811 #endif
3812 !sx->lmtp
3813 )
3814 {
3815 const uschar *s = string_printing(sx->buffer