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debug tidying
[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 int sep = ' ';
915 uschar name[32];
916
917 while (string_nextinlist(&list, &sep, name, sizeof(name)))
918 if (strcmpic(au->public_name, name) == 0)
919 { authbits |= BIT(authnum); break; }
920 }
921
922 DEBUG(D_transport)
923 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
924 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
925
926 if (tls_out.active.sock >= 0)
927 sx->ehlo_resp.crypted_auths = authbits;
928 else
929 sx->ehlo_resp.cleartext_auths = authbits;
930 return authbits;
931 }
932
933
934
935
936 /* Wait for and check responses for early-pipelining.
937
938 Called from the lower-level smtp_read_response() function
939 used for general code that assume synchronisation, if context
940 flags indicate outstanding early-pipelining commands. Also
941 called fom sync_responses() which handles pipelined commands.
942
943 Arguments:
944 sx smtp connection context
945 countp number of outstanding responses, adjusted on return
946
947 Return:
948 OK all well
949 DEFER error on first read of TLS'd conn
950 FAIL SMTP error in response
951 */
952 int
953 smtp_reap_early_pipe(smtp_context * sx, int * countp)
954 {
955 BOOL pending_BANNER = sx->pending_BANNER;
956 BOOL pending_EHLO = sx->pending_EHLO;
957 int rc = FAIL;
958
959 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
960 sx->pending_EHLO = FALSE;
961
962 if (pending_BANNER)
963 {
964 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
965 (*countp)--;
966 if (!smtp_reap_banner(sx))
967 {
968 DEBUG(D_transport) debug_printf("bad banner\n");
969 if (tls_out.active.sock >= 0) rc = DEFER;
970 goto fail;
971 }
972 }
973
974 if (pending_EHLO)
975 {
976 unsigned peer_offered;
977 unsigned short authbits = 0, * ap;
978
979 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
980 (*countp)--;
981 if (!smtp_reap_ehlo(sx))
982 {
983 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
984 if (tls_out.active.sock >= 0) rc = DEFER;
985 goto fail;
986 }
987
988 /* Compare the actual EHLO response to the cached value we assumed;
989 on difference, dump or rewrite the cache and arrange for a retry. */
990
991 ap = tls_out.active.sock < 0
992 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
993
994 peer_offered = ehlo_response(sx->buffer,
995 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
996 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
997 | OPTION_UTF8 | OPTION_EARLY_PIPE
998 );
999 if ( peer_offered != sx->peer_offered
1000 || (authbits = study_ehlo_auths(sx)) != *ap)
1001 {
1002 HDEBUG(D_transport)
1003 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1004 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1005 sx->peer_offered, *ap, peer_offered, authbits);
1006 *(tls_out.active.sock < 0
1007 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1008 *ap = authbits;
1009 if (peer_offered & OPTION_EARLY_PIPE)
1010 write_ehlo_cache_entry(sx);
1011 else
1012 invalidate_ehlo_cache_entry(sx);
1013
1014 return OK; /* just carry on */
1015 }
1016 }
1017 return OK;
1018
1019 fail:
1020 invalidate_ehlo_cache_entry(sx);
1021 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1022 return rc;
1023 }
1024 #endif
1025
1026
1027 /*************************************************
1028 * Synchronize SMTP responses *
1029 *************************************************/
1030
1031 /* This function is called from smtp_deliver() to receive SMTP responses from
1032 the server, and match them up with the commands to which they relate. When
1033 PIPELINING is not in use, this function is called after every command, and is
1034 therefore somewhat over-engineered, but it is simpler to use a single scheme
1035 that works both with and without PIPELINING instead of having two separate sets
1036 of code.
1037
1038 The set of commands that are buffered up with pipelining may start with MAIL
1039 and may end with DATA; in between are RCPT commands that correspond to the
1040 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1041 etc.) are never buffered.
1042
1043 Errors after MAIL or DATA abort the whole process leaving the response in the
1044 buffer. After MAIL, pending responses are flushed, and the original command is
1045 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1046 permitted to reject some recipient addresses while accepting others. However
1047 certain errors clearly abort the whole process. Set the value in
1048 transport_return to PENDING_OK if the address is accepted. If there is a
1049 subsequent general error, it will get reset accordingly. If not, it will get
1050 converted to OK at the end.
1051
1052 Arguments:
1053 sx smtp connection context
1054 count the number of responses to read
1055 pending_DATA 0 if last command sent was not DATA
1056 +1 if previously had a good recipient
1057 -1 if not previously had a good recipient
1058
1059 Returns: 3 if at least one address had 2xx and one had 5xx
1060 2 if at least one address had 5xx but none had 2xx
1061 1 if at least one host had a 2xx response, but none had 5xx
1062 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1063 -1 timeout while reading RCPT response
1064 -2 I/O or other non-response error for RCPT
1065 -3 DATA or MAIL failed - errno and buffer set
1066 -4 banner or EHLO failed (early-pipelining)
1067 -5 banner or EHLO failed (early-pipelining, TLS)
1068 */
1069
1070 static int
1071 sync_responses(smtp_context * sx, int count, int pending_DATA)
1072 {
1073 address_item * addr = sx->sync_addr;
1074 smtp_transport_options_block * ob = sx->conn_args.ob;
1075 int yield = 0;
1076
1077 #ifndef DISABLE_PIPE_CONNECT
1078 int rc;
1079 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1080 return rc == FAIL ? -4 : -5;
1081 #endif
1082
1083 /* Handle the response for a MAIL command. On error, reinstate the original
1084 command in big_buffer for error message use, and flush any further pending
1085 responses before returning, except after I/O errors and timeouts. */
1086
1087 if (sx->pending_MAIL)
1088 {
1089 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1090 count--;
1091 sx->pending_MAIL = FALSE;
1092 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1093 '2', ob->command_timeout))
1094 {
1095 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1096 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1097 if (errno == ERRNO_TLSFAILURE)
1098 return -5;
1099 if (errno == 0 && sx->buffer[0] != 0)
1100 {
1101 int save_errno = 0;
1102 if (sx->buffer[0] == '4')
1103 {
1104 save_errno = ERRNO_MAIL4XX;
1105 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1106 }
1107 count = smtp_discard_responses(sx, ob, count);
1108 errno = save_errno;
1109 }
1110
1111 if (pending_DATA) count--; /* Number of RCPT responses to come */
1112 while (count-- > 0) /* Mark any pending addrs with the host used */
1113 {
1114 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1115 addr->host_used = sx->conn_args.host;
1116 addr = addr->next;
1117 }
1118 return -3;
1119 }
1120 }
1121
1122 if (pending_DATA) count--; /* Number of RCPT responses to come */
1123
1124 /* Read and handle the required number of RCPT responses, matching each one up
1125 with an address by scanning for the next address whose status is PENDING_DEFER.
1126 */
1127
1128 while (count-- > 0)
1129 {
1130 while (addr->transport_return != PENDING_DEFER)
1131 if (!(addr = addr->next))
1132 return -2;
1133
1134 /* The address was accepted */
1135 addr->host_used = sx->conn_args.host;
1136
1137 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1138 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1139 '2', ob->command_timeout))
1140 {
1141 yield |= 1;
1142 addr->transport_return = PENDING_OK;
1143
1144 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1145 ensure that any address-specific retry record is expunged. We do this both
1146 for the basic key and for the version that also includes the sender. */
1147
1148 if (testflag(addr, af_dr_retry_exists))
1149 {
1150 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1151 sender_address);
1152 retry_add_item(addr, altkey, rf_delete);
1153 retry_add_item(addr, addr->address_retry_key, rf_delete);
1154 }
1155 }
1156
1157 /* Error on first TLS read */
1158
1159 else if (errno == ERRNO_TLSFAILURE)
1160 return -5;
1161
1162 /* Timeout while reading the response */
1163
1164 else if (errno == ETIMEDOUT)
1165 {
1166 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1167 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1168 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1169 retry_add_item(addr, addr->address_retry_key, 0);
1170 update_waiting = FALSE;
1171 return -1;
1172 }
1173
1174 /* Handle other errors in obtaining an SMTP response by returning -1. This
1175 will cause all the addresses to be deferred. Restore the SMTP command in
1176 big_buffer for which we are checking the response, so the error message
1177 makes sense. */
1178
1179 else if (errno != 0 || sx->buffer[0] == 0)
1180 {
1181 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1182
1183 /* Use taint-unchecked routines for writing into big_buffer, trusting
1184 that we'll never expand it. */
1185
1186 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1187 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1188 string_from_gstring(g);
1189 return -2;
1190 }
1191
1192 /* Handle SMTP permanent and temporary response codes. */
1193
1194 else
1195 {
1196 addr->message =
1197 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1198 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1199 string_printing(sx->buffer));
1200 setflag(addr, af_pass_message);
1201 if (!sx->verify)
1202 msglog_line(sx->conn_args.host, addr->message);
1203
1204 /* The response was 5xx */
1205
1206 if (sx->buffer[0] == '5')
1207 {
1208 addr->transport_return = FAIL;
1209 yield |= 2;
1210 }
1211
1212 /* The response was 4xx */
1213
1214 else
1215 {
1216 addr->transport_return = DEFER;
1217 addr->basic_errno = ERRNO_RCPT4XX;
1218 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1219
1220 if (!sx->verify)
1221 {
1222 #ifndef DISABLE_EVENT
1223 event_defer_errno = addr->more_errno;
1224 msg_event_raise(US"msg:rcpt:host:defer", addr);
1225 #endif
1226 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1227 start point for another MAIL command. */
1228
1229 if (addr->more_errno >> 8 == 52 && yield & 3)
1230 {
1231 if (!sx->RCPT_452)
1232 {
1233 DEBUG(D_transport)
1234 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1235 sx->RCPT_452 = TRUE;
1236 sx->next_addr = addr;
1237 }
1238 addr->transport_return = PENDING_DEFER;
1239 addr->basic_errno = 0;
1240 }
1241 else
1242 {
1243 /* Log temporary errors if there are more hosts to be tried.
1244 If not, log this last one in the == line. */
1245
1246 if (sx->conn_args.host->next)
1247 if (LOGGING(outgoing_port))
1248 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1249 sx->conn_args.host->address,
1250 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1251 else
1252 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1253 sx->conn_args.host->address, addr->message);
1254
1255 #ifndef DISABLE_EVENT
1256 else
1257 msg_event_raise(US"msg:rcpt:defer", addr);
1258 #endif
1259
1260 /* Do not put this message on the list of those waiting for specific
1261 hosts, as otherwise it is likely to be tried too often. */
1262
1263 update_waiting = FALSE;
1264
1265 /* Add a retry item for the address so that it doesn't get tried again
1266 too soon. If address_retry_include_sender is true, add the sender address
1267 to the retry key. */
1268
1269 retry_add_item(addr,
1270 ob->address_retry_include_sender
1271 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1272 : addr->address_retry_key,
1273 0);
1274 }
1275 }
1276 }
1277 }
1278 } /* Loop for next RCPT response */
1279
1280 /* Update where to start at for the next block of responses, unless we
1281 have already handled all the addresses. */
1282
1283 if (addr) sx->sync_addr = addr->next;
1284
1285 /* Handle a response to DATA. If we have not had any good recipients, either
1286 previously or in this block, the response is ignored. */
1287
1288 if (pending_DATA != 0)
1289 {
1290 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1291 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1292 '3', ob->command_timeout))
1293 {
1294 int code;
1295 uschar *msg;
1296 BOOL pass_message;
1297
1298 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1299 return -5;
1300
1301 if (pending_DATA > 0 || (yield & 1) != 0)
1302 {
1303 if (errno == 0 && sx->buffer[0] == '4')
1304 {
1305 errno = ERRNO_DATA4XX;
1306 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1307 }
1308 return -3;
1309 }
1310 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1311 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1312 "is in use and there were no good recipients\n", msg);
1313 }
1314 }
1315
1316 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1317 present) received 3xx. If any RCPTs were handled and yielded anything other
1318 than 4xx, yield will be set non-zero. */
1319
1320 return yield;
1321 }
1322
1323
1324
1325
1326
1327 /* Try an authenticator's client entry */
1328
1329 static int
1330 try_authenticator(smtp_context * sx, auth_instance * au)
1331 {
1332 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1333 host_item * host = sx->conn_args.host; /* host to deliver to */
1334 int rc;
1335
1336 sx->outblock.authenticating = TRUE;
1337 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1338 sx->buffer, sizeof(sx->buffer));
1339 sx->outblock.authenticating = FALSE;
1340 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1341
1342 /* A temporary authentication failure must hold up delivery to
1343 this host. After a permanent authentication failure, we carry on
1344 to try other authentication methods. If all fail hard, try to
1345 deliver the message unauthenticated unless require_auth was set. */
1346
1347 switch(rc)
1348 {
1349 case OK:
1350 f.smtp_authenticated = TRUE; /* stops the outer loop */
1351 client_authenticator = au->name;
1352 if (au->set_client_id)
1353 client_authenticated_id = expand_string(au->set_client_id);
1354 break;
1355
1356 /* Failure after writing a command */
1357
1358 case FAIL_SEND:
1359 return FAIL_SEND;
1360
1361 /* Failure after reading a response */
1362
1363 case FAIL:
1364 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1365 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1366 au->name, host->name, host->address, sx->buffer);
1367 break;
1368
1369 /* Failure by some other means. In effect, the authenticator
1370 decided it wasn't prepared to handle this case. Typically this
1371 is the result of "fail" in an expansion string. Do we need to
1372 log anything here? Feb 2006: a message is now put in the buffer
1373 if logging is required. */
1374
1375 case CANCELLED:
1376 if (*sx->buffer != 0)
1377 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1378 "authentication H=%s [%s] %s", au->name, host->name,
1379 host->address, sx->buffer);
1380 break;
1381
1382 /* Internal problem, message in buffer. */
1383
1384 case ERROR:
1385 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1386 DEFER, FALSE, &sx->delivery_start);
1387 return ERROR;
1388 }
1389 return OK;
1390 }
1391
1392
1393
1394
1395 /* Do the client side of smtp-level authentication.
1396
1397 Arguments:
1398 sx smtp connection context
1399
1400 sx->buffer should have the EHLO response from server (gets overwritten)
1401
1402 Returns:
1403 OK Success, or failed (but not required): global "smtp_authenticated" set
1404 DEFER Failed authentication (and was required)
1405 ERROR Internal problem
1406
1407 FAIL_SEND Failed communications - transmit
1408 FAIL - response
1409 */
1410
1411 static int
1412 smtp_auth(smtp_context * sx)
1413 {
1414 host_item * host = sx->conn_args.host; /* host to deliver to */
1415 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1416 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1417 #ifndef DISABLE_PIPE_CONNECT
1418 unsigned short authbits = tls_out.active.sock >= 0
1419 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1420 #endif
1421 uschar * fail_reason = US"server did not advertise AUTH support";
1422
1423 f.smtp_authenticated = FALSE;
1424 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1425
1426 if (!regex_AUTH)
1427 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1428
1429 /* Is the server offering AUTH? */
1430
1431 if ( sx->esmtp
1432 &&
1433 #ifndef DISABLE_PIPE_CONNECT
1434 sx->early_pipe_active ? authbits
1435 :
1436 #endif
1437 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1438 )
1439 {
1440 uschar * names = NULL;
1441 expand_nmax = -1; /* reset */
1442
1443 #ifndef DISABLE_PIPE_CONNECT
1444 if (!sx->early_pipe_active)
1445 #endif
1446 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1447
1448 /* Must not do this check until after we have saved the result of the
1449 regex match above as the check could be another RE. */
1450
1451 if ( require_auth == OK
1452 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1453 {
1454 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1455 fail_reason = US"no common mechanisms were found";
1456
1457 #ifndef DISABLE_PIPE_CONNECT
1458 if (sx->early_pipe_active)
1459 {
1460 /* Scan our authenticators (which support use by a client and were offered
1461 by the server (checked at cache-write time)), not suppressed by
1462 client_condition. If one is found, attempt to authenticate by calling its
1463 client function. We are limited to supporting up to 16 authenticator
1464 public-names by the number of bits in a short. */
1465
1466 auth_instance * au;
1467 uschar bitnum;
1468 int rc;
1469
1470 for (bitnum = 0, au = auths;
1471 !f.smtp_authenticated && au && bitnum < 16;
1472 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1473 {
1474 if ( au->client_condition
1475 && !expand_check_condition(au->client_condition, au->name,
1476 US"client authenticator"))
1477 {
1478 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1479 au->name, "client_condition is false");
1480 continue;
1481 }
1482
1483 /* Found data for a listed mechanism. Call its client entry. Set
1484 a flag in the outblock so that data is overwritten after sending so
1485 that reflections don't show it. */
1486
1487 fail_reason = US"authentication attempt(s) failed";
1488
1489 if ((rc = try_authenticator(sx, au)) != OK)
1490 return rc;
1491 }
1492 }
1493 else
1494 #endif
1495
1496 /* Scan the configured authenticators looking for one which is configured
1497 for use as a client, which is not suppressed by client_condition, and
1498 whose name matches an authentication mechanism supported by the server.
1499 If one is found, attempt to authenticate by calling its client function.
1500 */
1501
1502 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1503 {
1504 uschar *p = names;
1505
1506 if ( !au->client
1507 || ( au->client_condition
1508 && !expand_check_condition(au->client_condition, au->name,
1509 US"client authenticator")))
1510 {
1511 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1512 au->name,
1513 (au->client)? "client_condition is false" :
1514 "not configured as a client");
1515 continue;
1516 }
1517
1518 /* Loop to scan supported server mechanisms */
1519
1520 while (*p)
1521 {
1522 int len = Ustrlen(au->public_name);
1523 int rc;
1524
1525 while (isspace(*p)) p++;
1526
1527 if (strncmpic(au->public_name, p, len) != 0 ||
1528 (p[len] != 0 && !isspace(p[len])))
1529 {
1530 while (*p != 0 && !isspace(*p)) p++;
1531 continue;
1532 }
1533
1534 /* Found data for a listed mechanism. Call its client entry. Set
1535 a flag in the outblock so that data is overwritten after sending so
1536 that reflections don't show it. */
1537
1538 fail_reason = US"authentication attempt(s) failed";
1539
1540 if ((rc = try_authenticator(sx, au)) != OK)
1541 return rc;
1542
1543 break; /* If not authenticated, try next authenticator */
1544 } /* Loop for scanning supported server mechanisms */
1545 } /* Loop for further authenticators */
1546 }
1547 }
1548
1549 /* If we haven't authenticated, but are required to, give up. */
1550
1551 if (require_auth == OK && !f.smtp_authenticated)
1552 {
1553 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1554 string_sprintf("authentication required but %s", fail_reason), DEFER,
1555 FALSE, &sx->delivery_start);
1556 return DEFER;
1557 }
1558
1559 return OK;
1560 }
1561
1562
1563 /* Construct AUTH appendix string for MAIL TO */
1564 /*
1565 Arguments
1566 sx context for smtp connection
1567 p point in sx->buffer to build string
1568 addrlist chain of potential addresses to deliver
1569
1570 Globals f.smtp_authenticated
1571 client_authenticated_sender
1572 Return True on error, otherwise buffer has (possibly empty) terminated string
1573 */
1574
1575 static BOOL
1576 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1577 {
1578 smtp_transport_options_block * ob = sx->conn_args.ob;
1579 uschar * local_authenticated_sender = authenticated_sender;
1580
1581 #ifdef notdef
1582 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1583 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1584 #endif
1585
1586 if (ob->authenticated_sender)
1587 {
1588 uschar * new = expand_string(ob->authenticated_sender);
1589 if (!new)
1590 {
1591 if (!f.expand_string_forcedfail)
1592 {
1593 uschar *message = string_sprintf("failed to expand "
1594 "authenticated_sender: %s", expand_string_message);
1595 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1596 return TRUE;
1597 }
1598 }
1599 else if (*new)
1600 local_authenticated_sender = new;
1601 }
1602
1603 /* Add the authenticated sender address if present */
1604
1605 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1606 && local_authenticated_sender)
1607 {
1608 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1609 auth_xtextencode(local_authenticated_sender,
1610 Ustrlen(local_authenticated_sender)));
1611 client_authenticated_sender = string_copy(local_authenticated_sender);
1612 }
1613 else
1614 *p = 0;
1615
1616 return FALSE;
1617 }
1618
1619
1620
1621 typedef struct smtp_compare_s
1622 {
1623 uschar *current_sender_address;
1624 struct transport_instance *tblock;
1625 } smtp_compare_t;
1626
1627
1628 /* Create a unique string that identifies this message, it is based on
1629 sender_address, helo_data and tls_certificate if enabled.
1630 */
1631
1632 static uschar *
1633 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1634 {
1635 address_item * addr1;
1636 uschar * if1 = US"";
1637 uschar * helo1 = US"";
1638 #ifndef DISABLE_TLS
1639 uschar * tlsc1 = US"";
1640 #endif
1641 uschar * save_sender_address = sender_address;
1642 uschar * local_identity = NULL;
1643 smtp_transport_options_block * ob = SOB tblock->options_block;
1644
1645 sender_address = sender;
1646
1647 addr1 = deliver_make_addr (sender, TRUE);
1648 deliver_set_expansions(addr1);
1649
1650 if (ob->interface)
1651 if1 = expand_string(ob->interface);
1652
1653 if (ob->helo_data)
1654 helo1 = expand_string(ob->helo_data);
1655
1656 #ifndef DISABLE_TLS
1657 if (ob->tls_certificate)
1658 tlsc1 = expand_string(ob->tls_certificate);
1659 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1660 #else
1661 local_identity = string_sprintf ("%s^%s", if1, helo1);
1662 #endif
1663
1664 deliver_set_expansions(NULL);
1665 sender_address = save_sender_address;
1666
1667 return local_identity;
1668 }
1669
1670
1671
1672 /* This routine is a callback that is called from transport_check_waiting.
1673 This function will evaluate the incoming message versus the previous
1674 message. If the incoming message is using a different local identity then
1675 we will veto this new message. */
1676
1677 static BOOL
1678 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1679 {
1680 uschar * message_local_identity,
1681 * current_local_identity,
1682 * new_sender_address;
1683
1684 current_local_identity =
1685 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1686
1687 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1688 return FALSE;
1689
1690 message_local_identity =
1691 smtp_local_identity(new_sender_address, s_compare->tblock);
1692
1693 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1694 }
1695
1696
1697
1698 static unsigned
1699 ehlo_response(uschar * buf, unsigned checks)
1700 {
1701 size_t bsize = Ustrlen(buf);
1702
1703 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1704
1705 #ifndef DISABLE_TLS
1706 if ( checks & OPTION_TLS
1707 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1708 #endif
1709 checks &= ~OPTION_TLS;
1710
1711 if ( checks & OPTION_IGNQ
1712 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1713 PCRE_EOPT, NULL, 0) < 0)
1714 checks &= ~OPTION_IGNQ;
1715
1716 if ( checks & OPTION_CHUNKING
1717 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1718 checks &= ~OPTION_CHUNKING;
1719
1720 #ifndef DISABLE_PRDR
1721 if ( checks & OPTION_PRDR
1722 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1723 #endif
1724 checks &= ~OPTION_PRDR;
1725
1726 #ifdef SUPPORT_I18N
1727 if ( checks & OPTION_UTF8
1728 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1729 #endif
1730 checks &= ~OPTION_UTF8;
1731
1732 if ( checks & OPTION_DSN
1733 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1734 checks &= ~OPTION_DSN;
1735
1736 if ( checks & OPTION_PIPE
1737 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1738 PCRE_EOPT, NULL, 0) < 0)
1739 checks &= ~OPTION_PIPE;
1740
1741 if ( checks & OPTION_SIZE
1742 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1743 checks &= ~OPTION_SIZE;
1744
1745 #ifndef DISABLE_PIPE_CONNECT
1746 if ( checks & OPTION_EARLY_PIPE
1747 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1748 PCRE_EOPT, NULL, 0) < 0)
1749 #endif
1750 checks &= ~OPTION_EARLY_PIPE;
1751
1752 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1753 return checks;
1754 }
1755
1756
1757
1758 /* Callback for emitting a BDAT data chunk header.
1759
1760 If given a nonzero size, first flush any buffered SMTP commands
1761 then emit the command.
1762
1763 Reap previous SMTP command responses if requested, and always reap
1764 the response from a previous BDAT command.
1765
1766 Args:
1767 tctx transport context
1768 chunk_size value for SMTP BDAT command
1769 flags
1770 tc_chunk_last add LAST option to SMTP BDAT command
1771 tc_reap_prev reap response to previous SMTP commands
1772
1773 Returns:
1774 OK or ERROR
1775 DEFER TLS error on first read (EHLO-resp); errno set
1776 */
1777
1778 static int
1779 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1780 unsigned flags)
1781 {
1782 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1783 smtp_context * sx = tctx->smtp_context;
1784 int cmd_count = 0;
1785 int prev_cmd_count;
1786
1787 /* Write SMTP chunk header command. If not reaping responses, note that
1788 there may be more writes (like, the chunk data) done soon. */
1789
1790 if (chunk_size > 0)
1791 {
1792 #ifndef DISABLE_PIPE_CONNECT
1793 BOOL new_conn = !!(sx->outblock.conn_args);
1794 #endif
1795 if((cmd_count = smtp_write_command(sx,
1796 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1797 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1798 ) < 0) return ERROR;
1799 if (flags & tc_chunk_last)
1800 data_command = string_copy(big_buffer); /* Save for later error message */
1801 #ifndef DISABLE_PIPE_CONNECT
1802 /* That command write could have been the one that made the connection.
1803 Copy the fd from the client conn ctx (smtp transport specific) to the
1804 generic transport ctx. */
1805
1806 if (new_conn)
1807 tctx->u.fd = sx->outblock.cctx->sock;
1808 #endif
1809 }
1810
1811 prev_cmd_count = cmd_count += sx->cmd_count;
1812
1813 /* Reap responses for any previous, but not one we just emitted */
1814
1815 if (chunk_size > 0)
1816 prev_cmd_count--;
1817 if (sx->pending_BDAT)
1818 prev_cmd_count--;
1819
1820 if (flags & tc_reap_prev && prev_cmd_count > 0)
1821 {
1822 DEBUG(D_transport) debug_printf("look for %d responses"
1823 " for previous pipelined cmds\n", prev_cmd_count);
1824
1825 switch(sync_responses(sx, prev_cmd_count, 0))
1826 {
1827 case 1: /* 2xx (only) => OK */
1828 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1829 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1830 case 0: break; /* No 2xx or 5xx, but no probs */
1831
1832 case -5: errno = ERRNO_TLSFAILURE;
1833 return DEFER;
1834 #ifndef DISABLE_PIPE_CONNECT
1835 case -4: /* non-2xx for pipelined banner or EHLO */
1836 #endif
1837 case -1: /* Timeout on RCPT */
1838 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1839 }
1840 cmd_count = 1;
1841 if (!sx->pending_BDAT)
1842 pipelining_active = FALSE;
1843 }
1844
1845 /* Reap response for an outstanding BDAT */
1846
1847 if (sx->pending_BDAT)
1848 {
1849 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1850
1851 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1852 ob->command_timeout))
1853 {
1854 if (errno == 0 && sx->buffer[0] == '4')
1855 {
1856 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1857 sx->addrlist->more_errno |=
1858 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1859 }
1860 return ERROR;
1861 }
1862 cmd_count--;
1863 sx->pending_BDAT = FALSE;
1864 pipelining_active = FALSE;
1865 }
1866 else if (chunk_size > 0)
1867 sx->pending_BDAT = TRUE;
1868
1869
1870 sx->cmd_count = cmd_count;
1871 return OK;
1872 }
1873
1874
1875
1876
1877
1878 /*************************************************
1879 * Make connection for given message *
1880 *************************************************/
1881
1882 /*
1883 Arguments:
1884 ctx connection context
1885 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1886 a second attempt after TLS initialization fails
1887
1888 Returns: OK - the connection was made and the delivery attempted;
1889 fd is set in the conn context, tls_out set up.
1890 DEFER - the connection could not be made, or something failed
1891 while setting up the SMTP session, or there was a
1892 non-message-specific error, such as a timeout.
1893 ERROR - helo_data or add_headers or authenticated_sender is
1894 specified for this transport, and the string failed
1895 to expand
1896 */
1897 int
1898 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1899 {
1900 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1901 BOOL pass_message = FALSE;
1902 uschar * message = NULL;
1903 int yield = OK;
1904 #ifndef DISABLE_TLS
1905 uschar * tls_errstr;
1906 #endif
1907
1908 sx->conn_args.ob = ob;
1909
1910 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1911 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1912 /* sx->ok = FALSE; */
1913 sx->send_rset = TRUE;
1914 sx->send_quit = TRUE;
1915 sx->setting_up = TRUE;
1916 sx->esmtp = TRUE;
1917 /* sx->esmtp_sent = FALSE; */
1918 #ifdef SUPPORT_I18N
1919 /* sx->utf8_needed = FALSE; */
1920 #endif
1921 sx->dsn_all_lasthop = TRUE;
1922 #ifdef SUPPORT_DANE
1923 /* sx->conn_args.dane = FALSE; */
1924 sx->dane_required =
1925 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1926 #endif
1927 #ifndef DISABLE_PIPE_CONNECT
1928 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
1929 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
1930 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
1931 #endif
1932
1933 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1934 /* sx->peer_offered = 0; */
1935 /* sx->avoid_option = 0; */
1936 sx->igquotstr = US"";
1937 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1938 #ifdef EXPERIMENTAL_DSN_INFO
1939 /* sx->smtp_greeting = NULL; */
1940 /* sx->helo_response = NULL; */
1941 #endif
1942
1943 smtp_command = US"initial connection";
1944 /* sx->buffer[0] = '\0'; */
1945
1946 /* Set up the buffer for reading SMTP response packets. */
1947
1948 sx->inblock.buffer = sx->inbuffer;
1949 sx->inblock.buffersize = sizeof(sx->inbuffer);
1950 sx->inblock.ptr = sx->inbuffer;
1951 sx->inblock.ptrend = sx->inbuffer;
1952
1953 /* Set up the buffer for holding SMTP commands while pipelining */
1954
1955 sx->outblock.buffer = sx->outbuffer;
1956 sx->outblock.buffersize = sizeof(sx->outbuffer);
1957 sx->outblock.ptr = sx->outbuffer;
1958 /* sx->outblock.cmd_count = 0; */
1959 /* sx->outblock.authenticating = FALSE; */
1960 /* sx->outblock.conn_args = NULL; */
1961
1962 /* Reset the parameters of a TLS session. */
1963
1964 tls_out.bits = 0;
1965 tls_out.cipher = NULL; /* the one we may use for this transport */
1966 tls_out.ourcert = NULL;
1967 tls_out.peercert = NULL;
1968 tls_out.peerdn = NULL;
1969 #ifdef USE_OPENSSL
1970 tls_out.sni = NULL;
1971 #endif
1972 tls_out.ocsp = OCSP_NOT_REQ;
1973 #ifdef EXPERIMENTAL_TLS_RESUME
1974 tls_out.resumption = 0;
1975 #endif
1976 tls_out.ver = NULL;
1977
1978 /* Flip the legacy TLS-related variables over to the outbound set in case
1979 they're used in the context of the transport. Don't bother resetting
1980 afterward (when being used by a transport) as we're in a subprocess.
1981 For verify, unflipped once the callout is dealt with */
1982
1983 tls_modify_variables(&tls_out);
1984
1985 #ifdef DISABLE_TLS
1986 if (sx->smtps)
1987 {
1988 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1989 DEFER, FALSE, &sx->delivery_start);
1990 return ERROR;
1991 }
1992 #endif
1993
1994 /* Make a connection to the host if this isn't a continued delivery, and handle
1995 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1996 specially so they can be identified for retries. */
1997
1998 if (!continue_hostname)
1999 {
2000 if (sx->verify)
2001 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2002
2003 /* Get the actual port the connection will use, into sx->conn_args.host */
2004
2005 smtp_port_for_connect(sx->conn_args.host, sx->port);
2006
2007 #ifdef SUPPORT_DANE
2008 /* Do TLSA lookup for DANE */
2009 {
2010 tls_out.dane_verified = FALSE;
2011 tls_out.tlsa_usage = 0;
2012
2013 if (sx->conn_args.host->dnssec == DS_YES)
2014 {
2015 int rc;
2016 if( sx->dane_required
2017 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2018 )
2019 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2020 {
2021 case OK: sx->conn_args.dane = TRUE;
2022 ob->tls_tempfail_tryclear = FALSE;
2023 break;
2024 case FAIL_FORCED: break;
2025 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2026 string_sprintf("DANE error: tlsa lookup %s",
2027 rc_to_string(rc)),
2028 rc, FALSE, &sx->delivery_start);
2029 # ifndef DISABLE_EVENT
2030 (void) event_raise(sx->conn_args.tblock->event_action,
2031 US"dane:fail", sx->dane_required
2032 ? US"dane-required" : US"dnssec-invalid");
2033 # endif
2034 return rc;
2035 }
2036 }
2037 else if (sx->dane_required)
2038 {
2039 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2040 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2041 FAIL, FALSE, &sx->delivery_start);
2042 # ifndef DISABLE_EVENT
2043 (void) event_raise(sx->conn_args.tblock->event_action,
2044 US"dane:fail", US"dane-required");
2045 # endif
2046 return FAIL;
2047 }
2048 }
2049 #endif /*DANE*/
2050
2051 /* Make the TCP connection */
2052
2053 sx->cctx.tls_ctx = NULL;
2054 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2055 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2056
2057 #ifndef DISABLE_PIPE_CONNECT
2058 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2059 sx->conn_args.host) == OK)
2060
2061 /* We don't find out the local ip address until the connect, so if
2062 the helo string might use it avoid doing early-pipelining. */
2063
2064 if ( !sx->helo_data
2065 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2066 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2067 )
2068 {
2069 sx->early_pipe_ok = TRUE;
2070 if ( read_ehlo_cache_entry(sx)
2071 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2072 {
2073 DEBUG(D_transport)
2074 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2075 sx->early_pipe_active = TRUE;
2076 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2077 }
2078 }
2079 else DEBUG(D_transport)
2080 debug_printf("helo needs $sending_ip_address\n");
2081
2082 PIPE_CONNECT_RETRY:
2083 if (sx->early_pipe_active)
2084 sx->outblock.conn_args = &sx->conn_args;
2085 else
2086 #endif
2087 {
2088 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2089 {
2090 set_errno_nohost(sx->addrlist,
2091 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2092 sx->verify ? US strerror(errno) : NULL,
2093 DEFER, FALSE, &sx->delivery_start);
2094 sx->send_quit = FALSE;
2095 return DEFER;
2096 }
2097 }
2098 /* Expand the greeting message while waiting for the initial response. (Makes
2099 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2100 delayed till here so that $sending_interface and $sending_port are set. */
2101 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2102 will be? Somehow I doubt it. */
2103
2104 if (sx->helo_data)
2105 if (!(sx->helo_data = expand_string(sx->helo_data)))
2106 if (sx->verify)
2107 log_write(0, LOG_MAIN|LOG_PANIC,
2108 "<%s>: failed to expand transport's helo_data value for callout: %s",
2109 sx->addrlist->address, expand_string_message);
2110
2111 #ifdef SUPPORT_I18N
2112 if (sx->helo_data)
2113 {
2114 expand_string_message = NULL;
2115 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2116 &expand_string_message)),
2117 expand_string_message)
2118 if (sx->verify)
2119 log_write(0, LOG_MAIN|LOG_PANIC,
2120 "<%s>: failed to expand transport's helo_data value for callout: %s",
2121 sx->addrlist->address, expand_string_message);
2122 else
2123 sx->helo_data = NULL;
2124 }
2125 #endif
2126
2127 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2128 is nevertheless a reasonably clean way of programming this kind of logic,
2129 where you want to escape on any error. */
2130
2131 if (!sx->smtps)
2132 {
2133 #ifndef DISABLE_PIPE_CONNECT
2134 if (sx->early_pipe_active)
2135 {
2136 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2137 sx->outblock.cmd_count = 1;
2138 }
2139 else
2140 #endif
2141 {
2142 #ifdef TCP_QUICKACK
2143 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2144 sizeof(off));
2145 #endif
2146 if (!smtp_reap_banner(sx))
2147 goto RESPONSE_FAILED;
2148 }
2149
2150 #ifndef DISABLE_EVENT
2151 {
2152 uschar * s;
2153 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2154 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2155 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2156 if (s)
2157 {
2158 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2159 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2160 DEFER, FALSE, &sx->delivery_start);
2161 yield = DEFER;
2162 goto SEND_QUIT;
2163 }
2164 }
2165 #endif
2166
2167 /* Now check if the helo_data expansion went well, and sign off cleanly if
2168 it didn't. */
2169
2170 if (!sx->helo_data)
2171 {
2172 message = string_sprintf("failed to expand helo_data: %s",
2173 expand_string_message);
2174 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2175 yield = DEFER;
2176 goto SEND_QUIT;
2177 }
2178 }
2179
2180 /** Debugging without sending a message
2181 sx->addrlist->transport_return = DEFER;
2182 goto SEND_QUIT;
2183 **/
2184
2185 /* Errors that occur after this point follow an SMTP command, which is
2186 left in big_buffer by smtp_write_command() for use in error messages. */
2187
2188 smtp_command = big_buffer;
2189
2190 /* Tell the remote who we are...
2191
2192 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2193 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2194 greeting is of this form. The assumption was that the far end supports it
2195 properly... but experience shows that there are some that give 5xx responses,
2196 even though the banner includes "ESMTP" (there's a bloody-minded one that
2197 says "ESMTP not spoken here"). Cope with that case.
2198
2199 September 2000: Time has passed, and it seems reasonable now to always send
2200 EHLO at the start. It is also convenient to make the change while installing
2201 the TLS stuff.
2202
2203 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2204 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2205 would be no way to send out the mails, so there is now a host list
2206 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2207 PIPELINING problem as well. Maybe it can also be useful to cure other
2208 problems with broken servers.
2209
2210 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2211 Then somebody tried it with a Microsoft mailer... It seems that all other
2212 mailers use upper case for some reason (the RFC is quite clear about case
2213 independence) so, for peace of mind, I gave in. */
2214
2215 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2216
2217 /* Alas; be careful, since this goto is not an error-out, so conceivably
2218 we might set data between here and the target which we assume to exist
2219 and be usable. I can see this coming back to bite us. */
2220 #ifndef DISABLE_TLS
2221 if (sx->smtps)
2222 {
2223 smtp_peer_options |= OPTION_TLS;
2224 suppress_tls = FALSE;
2225 ob->tls_tempfail_tryclear = FALSE;
2226 smtp_command = US"SSL-on-connect";
2227 goto TLS_NEGOTIATE;
2228 }
2229 #endif
2230
2231 if (sx->esmtp)
2232 {
2233 if (smtp_write_command(sx,
2234 #ifndef DISABLE_PIPE_CONNECT
2235 sx->early_pipe_active ? SCMD_BUFFER :
2236 #endif
2237 SCMD_FLUSH,
2238 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2239 goto SEND_FAILED;
2240 sx->esmtp_sent = TRUE;
2241
2242 #ifndef DISABLE_PIPE_CONNECT
2243 if (sx->early_pipe_active)
2244 {
2245 sx->pending_EHLO = TRUE;
2246
2247 /* If we have too many authenticators to handle and might need to AUTH
2248 for this transport, pipeline no further as we will need the
2249 list of auth methods offered. Reap the banner and EHLO. */
2250
2251 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2252 && f.smtp_in_early_pipe_no_auth)
2253 {
2254 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2255 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2256 goto SEND_FAILED;
2257 if (sync_responses(sx, 2, 0) != 0)
2258 {
2259 HDEBUG(D_transport)
2260 debug_printf("failed reaping pipelined cmd responses\n");
2261 goto RESPONSE_FAILED;
2262 }
2263 sx->early_pipe_active = FALSE;
2264 }
2265 }
2266 else
2267 #endif
2268 if (!smtp_reap_ehlo(sx))
2269 goto RESPONSE_FAILED;
2270 }
2271 else
2272 DEBUG(D_transport)
2273 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2274
2275 #ifndef DISABLE_PIPE_CONNECT
2276 if (!sx->early_pipe_active)
2277 #endif
2278 if (!sx->esmtp)
2279 {
2280 BOOL good_response;
2281 int n = sizeof(sx->buffer);
2282 uschar * rsp = sx->buffer;
2283
2284 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2285 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2286
2287 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2288 goto SEND_FAILED;
2289 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2290 #ifdef EXPERIMENTAL_DSN_INFO
2291 sx->helo_response = string_copy(rsp);
2292 #endif
2293 if (!good_response)
2294 {
2295 /* Handle special logging for a closed connection after HELO
2296 when had previously sent EHLO */
2297
2298 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2299 {
2300 errno = ERRNO_SMTPCLOSED;
2301 goto EHLOHELO_FAILED;
2302 }
2303 memmove(sx->buffer, rsp, Ustrlen(rsp));
2304 goto RESPONSE_FAILED;
2305 }
2306 }
2307
2308 if (sx->esmtp || sx->lmtp)
2309 {
2310 #ifndef DISABLE_PIPE_CONNECT
2311 if (!sx->early_pipe_active)
2312 #endif
2313 {
2314 sx->peer_offered = ehlo_response(sx->buffer,
2315 OPTION_TLS /* others checked later */
2316 #ifndef DISABLE_PIPE_CONNECT
2317 | (sx->early_pipe_ok
2318 ? OPTION_IGNQ
2319 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2320 #ifdef SUPPORT_I18N
2321 | OPTION_UTF8
2322 #endif
2323 | OPTION_EARLY_PIPE
2324 : 0
2325 )
2326 #endif
2327 );
2328 #ifndef DISABLE_PIPE_CONNECT
2329 if (sx->early_pipe_ok)
2330 {
2331 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2332
2333 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2334 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2335 {
2336 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2337 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2338 write_ehlo_cache_entry(sx);
2339 }
2340 }
2341 #endif
2342 }
2343
2344 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2345
2346 #ifndef DISABLE_TLS
2347 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2348 #endif
2349 }
2350 }
2351
2352 /* For continuing deliveries down the same channel, having re-exec'd the socket
2353 is the standard input; for a socket held open from verify it is recorded
2354 in the cutthrough context block. Either way we don't need to redo EHLO here
2355 (but may need to do so for TLS - see below).
2356 Set up the pointer to where subsequent commands will be left, for
2357 error messages. Note that smtp_peer_options will have been
2358 set from the command line if they were set in the process that passed the
2359 connection on. */
2360
2361 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2362 as the continue goes via transport_pass_socket() and doublefork and exec.
2363 It does not wait. Unclear how we keep separate host's responses
2364 separate - we could match up by host ip+port as a bodge. */
2365
2366 else
2367 {
2368 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2369 {
2370 sx->cctx = cutthrough.cctx;
2371 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2372 }
2373 else
2374 {
2375 sx->cctx.sock = 0; /* stdin */
2376 sx->cctx.tls_ctx = NULL;
2377 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2378 }
2379 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2380 smtp_command = big_buffer;
2381 sx->peer_offered = smtp_peer_options;
2382 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2383
2384 /* For a continued connection with TLS being proxied for us, or a
2385 held-open verify connection with TLS, nothing more to do. */
2386
2387 if ( continue_proxy_cipher
2388 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2389 && cutthrough.is_tls)
2390 )
2391 {
2392 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2393 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2394 continue_proxy_cipher ? "proxied" : "verify conn with");
2395 return OK;
2396 }
2397 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2398 }
2399
2400 /* If TLS is available on this connection, whether continued or not, attempt to
2401 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2402 send another EHLO - the server may give a different answer in secure mode. We
2403 use a separate buffer for reading the response to STARTTLS so that if it is
2404 negative, the original EHLO data is available for subsequent analysis, should
2405 the client not be required to use TLS. If the response is bad, copy the buffer
2406 for error analysis. */
2407
2408 #ifndef DISABLE_TLS
2409 if ( smtp_peer_options & OPTION_TLS
2410 && !suppress_tls
2411 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2412 && ( !sx->verify
2413 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2414 ) )
2415 {
2416 uschar buffer2[4096];
2417
2418 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2419 goto SEND_FAILED;
2420
2421 #ifndef DISABLE_PIPE_CONNECT
2422 /* If doing early-pipelining reap the banner and EHLO-response but leave
2423 the response for the STARTTLS we just sent alone. */
2424
2425 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2426 {
2427 HDEBUG(D_transport)
2428 debug_printf("failed reaping pipelined cmd responses\n");
2429 close(sx->cctx.sock);
2430 sx->cctx.sock = -1;
2431 sx->early_pipe_active = FALSE;
2432 goto PIPE_CONNECT_RETRY;
2433 }
2434 #endif
2435
2436 /* If there is an I/O error, transmission of this message is deferred. If
2437 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2438 false, we also defer. However, if there is a temporary rejection of STARTTLS
2439 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2440 STARTTLS, we carry on. This means we will try to send the message in clear,
2441 unless the host is in hosts_require_tls (tested below). */
2442
2443 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2444 {
2445 if ( errno != 0
2446 || buffer2[0] == 0
2447 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2448 )
2449 {
2450 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2451 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2452 goto RESPONSE_FAILED;
2453 }
2454 }
2455
2456 /* STARTTLS accepted: try to negotiate a TLS session. */
2457
2458 else
2459 TLS_NEGOTIATE:
2460 {
2461 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2462 {
2463 /* TLS negotiation failed; give an error. From outside, this function may
2464 be called again to try in clear on a new connection, if the options permit
2465 it for this host. */
2466 #ifdef USE_GNUTLS
2467 GNUTLS_CONN_FAILED:
2468 #endif
2469 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2470
2471 # ifdef SUPPORT_DANE
2472 if (sx->conn_args.dane)
2473 {
2474 log_write(0, LOG_MAIN,
2475 "DANE attempt failed; TLS connection to %s [%s]: %s",
2476 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2477 # ifndef DISABLE_EVENT
2478 (void) event_raise(sx->conn_args.tblock->event_action,
2479 US"dane:fail", US"validation-failure"); /* could do with better detail */
2480 # endif
2481 }
2482 # endif
2483
2484 errno = ERRNO_TLSFAILURE;
2485 message = string_sprintf("TLS session: %s", tls_errstr);
2486 sx->send_quit = FALSE;
2487 goto TLS_FAILED;
2488 }
2489
2490 /* TLS session is set up */
2491
2492 smtp_peer_options_wrap = smtp_peer_options;
2493 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2494 if (addr->transport_return == PENDING_DEFER)
2495 {
2496 addr->cipher = tls_out.cipher;
2497 addr->ourcert = tls_out.ourcert;
2498 addr->peercert = tls_out.peercert;
2499 addr->peerdn = tls_out.peerdn;
2500 addr->ocsp = tls_out.ocsp;
2501 addr->tlsver = tls_out.ver;
2502 }
2503 }
2504 }
2505
2506 /* if smtps, we'll have smtp_command set to something else; always safe to
2507 reset it here. */
2508 smtp_command = big_buffer;
2509
2510 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2511 helo_data is null, we are dealing with a connection that was passed from
2512 another process, and so we won't have expanded helo_data above. We have to
2513 expand it here. $sending_ip_address and $sending_port are set up right at the
2514 start of the Exim process (in exim.c). */
2515
2516 if (tls_out.active.sock >= 0)
2517 {
2518 uschar * greeting_cmd;
2519
2520 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2521 {
2522 uschar *message = string_sprintf("failed to expand helo_data: %s",
2523 expand_string_message);
2524 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2525 yield = DEFER;
2526 goto SEND_QUIT;
2527 }
2528
2529 #ifndef DISABLE_PIPE_CONNECT
2530 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2531 We're unlikely to get the group sent and delivered before the server sends its
2532 banner, but it's still worth sending as a group.
2533 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2534 the reverse. */
2535
2536 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2537 {
2538 sx->peer_offered = sx->ehlo_resp.crypted_features;
2539 if ((sx->early_pipe_active =
2540 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2541 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2542 }
2543 #endif
2544
2545 /* For SMTPS we need to wait for the initial OK response. */
2546 if (sx->smtps)
2547 #ifndef DISABLE_PIPE_CONNECT
2548 if (sx->early_pipe_active)
2549 {
2550 sx->pending_BANNER = TRUE;
2551 sx->outblock.cmd_count = 1;
2552 }
2553 else
2554 #endif
2555 if (!smtp_reap_banner(sx))
2556 goto RESPONSE_FAILED;
2557
2558 if (sx->lmtp)
2559 greeting_cmd = US"LHLO";
2560 else if (sx->esmtp)
2561 greeting_cmd = US"EHLO";
2562 else
2563 {
2564 greeting_cmd = US"HELO";
2565 DEBUG(D_transport)
2566 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2567 }
2568
2569 if (smtp_write_command(sx,
2570 #ifndef DISABLE_PIPE_CONNECT
2571 sx->early_pipe_active ? SCMD_BUFFER :
2572 #endif
2573 SCMD_FLUSH,
2574 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2575 goto SEND_FAILED;
2576
2577 #ifndef DISABLE_PIPE_CONNECT
2578 if (sx->early_pipe_active)
2579 sx->pending_EHLO = TRUE;
2580 else
2581 #endif
2582 {
2583 if (!smtp_reap_ehlo(sx))
2584 #ifdef USE_GNUTLS
2585 {
2586 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2587 cert late, under TLS1.3 - which means here; the first time we try to
2588 receive crypted data. Treat it as if it was a connect-time failure.
2589 See also the early-pipe equivalent... which will be hard; every call
2590 to sync_responses will need to check the result.
2591 It would be nicer to have GnuTLS check the cert during the handshake.
2592 Can it do that, with all the flexibility we need? */
2593
2594 tls_errstr = US"error on first read";
2595 goto GNUTLS_CONN_FAILED;
2596 }
2597 #else
2598 goto RESPONSE_FAILED;
2599 #endif
2600 smtp_peer_options = 0;
2601 }
2602 }
2603
2604 /* If the host is required to use a secure channel, ensure that we
2605 have one. */
2606
2607 else if ( sx->smtps
2608 # ifdef SUPPORT_DANE
2609 || sx->conn_args.dane
2610 # endif
2611 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2612 )
2613 {
2614 errno = ERRNO_TLSREQUIRED;
2615 message = string_sprintf("a TLS session is required, but %s",
2616 smtp_peer_options & OPTION_TLS
2617 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2618 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2619 if (sx->conn_args.dane)
2620 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2621 smtp_peer_options & OPTION_TLS
2622 ? US"validation-failure" /* could do with better detail */
2623 : US"starttls-not-supported");
2624 # endif
2625 goto TLS_FAILED;
2626 }
2627 #endif /*DISABLE_TLS*/
2628
2629 /* If TLS is active, we have just started it up and re-done the EHLO command,
2630 so its response needs to be analyzed. If TLS is not active and this is a
2631 continued session down a previously-used socket, we haven't just done EHLO, so
2632 we skip this. */
2633
2634 if (continue_hostname == NULL
2635 #ifndef DISABLE_TLS
2636 || tls_out.active.sock >= 0
2637 #endif
2638 )
2639 {
2640 if (sx->esmtp || sx->lmtp)
2641 {
2642 #ifndef DISABLE_PIPE_CONNECT
2643 if (!sx->early_pipe_active)
2644 #endif
2645 {
2646 sx->peer_offered = ehlo_response(sx->buffer,
2647 0 /* no TLS */
2648 #ifndef DISABLE_PIPE_CONNECT
2649 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2650 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2651 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2652 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2653
2654 #else
2655
2656 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2657 | OPTION_CHUNKING
2658 | OPTION_PRDR
2659 # ifdef SUPPORT_I18N
2660 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2661 /*XXX if we hand peercaps on to continued-conn processes,
2662 must not depend on this addr */
2663 # endif
2664 | OPTION_DSN
2665 | OPTION_PIPE
2666 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2667 #endif
2668 );
2669 #ifndef DISABLE_PIPE_CONNECT
2670 if (tls_out.active.sock >= 0)
2671 sx->ehlo_resp.crypted_features = sx->peer_offered;
2672 #endif
2673 }
2674
2675 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2676 lmtp_ignore_quota option was set. */
2677
2678 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2679
2680 /* If the response to EHLO specified support for the SIZE parameter, note
2681 this, provided size_addition is non-negative. */
2682
2683 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2684
2685 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2686 the current host, esmtp will be false, so PIPELINING can never be used. If
2687 the current host matches hosts_avoid_pipelining, don't do it. */
2688
2689 if ( sx->peer_offered & OPTION_PIPE
2690 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2691 smtp_peer_options |= OPTION_PIPE;
2692
2693 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2694 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2695
2696 if ( sx->peer_offered & OPTION_CHUNKING
2697 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2698 sx->peer_offered &= ~OPTION_CHUNKING;
2699
2700 if (sx->peer_offered & OPTION_CHUNKING)
2701 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2702
2703 #ifndef DISABLE_PRDR
2704 if ( sx->peer_offered & OPTION_PRDR
2705 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2706 sx->peer_offered &= ~OPTION_PRDR;
2707
2708 if (sx->peer_offered & OPTION_PRDR)
2709 DEBUG(D_transport) debug_printf("PRDR usable\n");
2710 #endif
2711
2712 /* Note if the server supports DSN */
2713 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2714 DEBUG(D_transport) debug_printf("%susing DSN\n",
2715 sx->peer_offered & OPTION_DSN ? "" : "not ");
2716
2717 #ifndef DISABLE_PIPE_CONNECT
2718 if ( sx->early_pipe_ok
2719 && !sx->early_pipe_active
2720 && tls_out.active.sock >= 0
2721 && smtp_peer_options & OPTION_PIPE
2722 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2723 & OPTION_EARLY_PIPE)
2724 {
2725 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2726 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2727 write_ehlo_cache_entry(sx);
2728 }
2729 #endif
2730
2731 /* Note if the response to EHLO specifies support for the AUTH extension.
2732 If it has, check that this host is one we want to authenticate to, and do
2733 the business. The host name and address must be available when the
2734 authenticator's client driver is running. */
2735
2736 switch (yield = smtp_auth(sx))
2737 {
2738 default: goto SEND_QUIT;
2739 case OK: break;
2740 case FAIL_SEND: goto SEND_FAILED;
2741 case FAIL: goto RESPONSE_FAILED;
2742 }
2743 }
2744 }
2745 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2746
2747 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2748 message-specific. */
2749
2750 sx->setting_up = FALSE;
2751
2752 #ifdef SUPPORT_I18N
2753 if (sx->addrlist->prop.utf8_msg)
2754 {
2755 uschar * s;
2756
2757 /* If the transport sets a downconversion mode it overrides any set by ACL
2758 for the message. */
2759
2760 if ((s = ob->utf8_downconvert))
2761 {
2762 if (!(s = expand_string(s)))
2763 {
2764 message = string_sprintf("failed to expand utf8_downconvert: %s",
2765 expand_string_message);
2766 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2767 yield = DEFER;
2768 goto SEND_QUIT;
2769 }
2770 switch (*s)
2771 {
2772 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2773 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2774 break;
2775 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2776 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2777 break;
2778 case '-': if (s[1] == '1')
2779 {
2780 sx->addrlist->prop.utf8_downcvt = FALSE;
2781 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2782 }
2783 break;
2784 }
2785 }
2786
2787 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2788 && !sx->addrlist->prop.utf8_downcvt_maybe;
2789 DEBUG(D_transport) if (!sx->utf8_needed)
2790 debug_printf("utf8: %s downconvert\n",
2791 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2792 }
2793
2794 /* If this is an international message we need the host to speak SMTPUTF8 */
2795 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2796 {
2797 errno = ERRNO_UTF8_FWD;
2798 goto RESPONSE_FAILED;
2799 }
2800 #endif /*SUPPORT_I18N*/
2801
2802 return OK;
2803
2804
2805 {
2806 int code;
2807
2808 RESPONSE_FAILED:
2809 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2810 {
2811 /* There is a testing facility for simulating a connection timeout, as I
2812 can't think of any other way of doing this. It converts a connection
2813 refused into a timeout if the timeout is set to 999999. This is done for
2814 a 3whs connection in ip_connect(), but a TFO connection does not error
2815 there - instead it gets ECONNREFUSED on the first data read. Tracking
2816 that a TFO really was done is too hard, or we would set a
2817 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2818 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2819 cmd-timeout. */
2820
2821 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2822 errno = ETIMEDOUT;
2823 set_errno_nohost(sx->addrlist,
2824 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2825 sx->verify ? US strerror(errno) : NULL,
2826 DEFER, FALSE, &sx->delivery_start);
2827 sx->send_quit = FALSE;
2828 return DEFER;
2829 }
2830
2831 /* really an error on an SMTP read */
2832 message = NULL;
2833 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2834 sx->buffer, &code, &message, &pass_message);
2835 yield = DEFER;
2836 goto FAILED;
2837
2838 SEND_FAILED:
2839 code = '4';
2840 message = US string_sprintf("send() to %s [%s] failed: %s",
2841 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2842 sx->send_quit = FALSE;
2843 yield = DEFER;
2844 goto FAILED;
2845
2846 EHLOHELO_FAILED:
2847 code = '4';
2848 message = string_sprintf("Remote host closed connection in response to %s"
2849 " (EHLO response was: %s)", smtp_command, sx->buffer);
2850 sx->send_quit = FALSE;
2851 yield = DEFER;
2852 goto FAILED;
2853
2854 /* This label is jumped to directly when a TLS negotiation has failed,
2855 or was not done for a host for which it is required. Values will be set
2856 in message and errno, and setting_up will always be true. Treat as
2857 a temporary error. */
2858
2859 #ifndef DISABLE_TLS
2860 TLS_FAILED:
2861 code = '4', yield = DEFER;
2862 goto FAILED;
2863 #endif
2864
2865 /* The failure happened while setting up the call; see if the failure was
2866 a 5xx response (this will either be on connection, or following HELO - a 5xx
2867 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2868 fail all addresses, as this host is never going to accept them. For other
2869 errors during setting up (timeouts or whatever), defer all addresses, and
2870 yield DEFER, so that the host is not tried again for a while.
2871
2872 XXX This peeking for another host feels like a layering violation. We want
2873 to note the host as unusable, but down here we shouldn't know if this was
2874 the last host to try for the addr(list). Perhaps the upper layer should be
2875 the one to do set_errno() ? The problem is that currently the addr is where
2876 errno etc. are stashed, but until we run out of hosts to try the errors are
2877 host-specific. Maybe we should enhance the host_item definition? */
2878
2879 FAILED:
2880 sx->ok = FALSE; /* For when reached by GOTO */
2881 set_errno(sx->addrlist, errno, message,
2882 sx->conn_args.host->next
2883 ? DEFER
2884 : code == '5'
2885 #ifdef SUPPORT_I18N
2886 || errno == ERRNO_UTF8_FWD
2887 #endif
2888 ? FAIL : DEFER,
2889 pass_message,
2890 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
2891 #ifdef EXPERIMENTAL_DSN_INFO
2892 sx->smtp_greeting, sx->helo_response,
2893 #endif
2894 &sx->delivery_start);
2895 }
2896
2897
2898 SEND_QUIT:
2899
2900 if (sx->send_quit)
2901 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2902
2903 #ifndef DISABLE_TLS
2904 if (sx->cctx.tls_ctx)
2905 {
2906 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2907 sx->cctx.tls_ctx = NULL;
2908 }
2909 #endif
2910
2911 /* Close the socket, and return the appropriate value, first setting
2912 works because the NULL setting is passed back to the calling process, and
2913 remote_max_parallel is forced to 1 when delivering over an existing connection,
2914 */
2915
2916 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2917 if (sx->send_quit)
2918 {
2919 shutdown(sx->cctx.sock, SHUT_WR);
2920 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2921 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2922 i--; /* drain socket */
2923 sx->send_quit = FALSE;
2924 }
2925 (void)close(sx->cctx.sock);
2926 sx->cctx.sock = -1;
2927
2928 #ifndef DISABLE_EVENT
2929 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2930 #endif
2931
2932 continue_transport = NULL;
2933 continue_hostname = NULL;
2934 return yield;
2935 }
2936
2937
2938
2939
2940 /* Create the string of options that will be appended to the MAIL FROM:
2941 in the connection context buffer */
2942
2943 static int
2944 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2945 {
2946 uschar * p = sx->buffer;
2947 address_item * addr;
2948 int address_count;
2949
2950 *p = 0;
2951
2952 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2953 send it, adding something to the message size to allow for imprecision
2954 and things that get added en route. Exim keeps the number of lines
2955 in a message, so we can give an accurate value for the original message, but we
2956 need some additional to handle added headers. (Double "." characters don't get
2957 included in the count.) */
2958
2959 if ( message_size > 0
2960 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2961 {
2962 /*XXX problem here under spool_files_wireformat?
2963 Or just forget about lines? Or inflate by a fixed proportion? */
2964
2965 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2966 while (*p) p++;
2967 }
2968
2969 #ifndef DISABLE_PRDR
2970 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2971 request that */
2972
2973 sx->prdr_active = FALSE;
2974 if (sx->peer_offered & OPTION_PRDR)
2975 for (address_item * addr = addrlist; addr; addr = addr->next)
2976 if (addr->transport_return == PENDING_DEFER)
2977 {
2978 for (addr = addr->next; addr; addr = addr->next)
2979 if (addr->transport_return == PENDING_DEFER)
2980 { /* at least two recipients to send */
2981 sx->prdr_active = TRUE;
2982 sprintf(CS p, " PRDR"); p += 5;
2983 break;
2984 }
2985 break;
2986 }
2987 #endif
2988
2989 #ifdef SUPPORT_I18N
2990 /* If it supports internationalised messages, and this meesage need that,
2991 request it */
2992
2993 if ( sx->peer_offered & OPTION_UTF8
2994 && addrlist->prop.utf8_msg
2995 && !addrlist->prop.utf8_downcvt
2996 )
2997 Ustrcpy(p, US" SMTPUTF8"), p += 9;
2998 #endif
2999
3000 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3001 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3002 addr && address_count < sx->max_rcpt;
3003 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3004 {
3005 address_count++;
3006 if (!(addr->dsn_flags & rf_dsnlasthop))
3007 {
3008 sx->dsn_all_lasthop = FALSE;
3009 break;
3010 }
3011 }
3012
3013 /* Add any DSN flags to the mail command */
3014
3015 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3016 {
3017 if (dsn_ret == dsn_ret_hdrs)
3018 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3019 else if (dsn_ret == dsn_ret_full)
3020 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3021
3022 if (dsn_envid)
3023 {
3024 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3025 while (*p) p++;
3026 }
3027 }
3028
3029 /* If an authenticated_sender override has been specified for this transport
3030 instance, expand it. If the expansion is forced to fail, and there was already
3031 an authenticated_sender for this message, the original value will be used.
3032 Other expansion failures are serious. An empty result is ignored, but there is
3033 otherwise no check - this feature is expected to be used with LMTP and other
3034 cases where non-standard addresses (e.g. without domains) might be required. */
3035
3036 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3037 }
3038
3039
3040 static void
3041 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3042 {
3043 uschar * p = sx->buffer;
3044 *p = 0;
3045
3046 /* Add any DSN flags to the rcpt command */
3047
3048 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3049 {
3050 if (addr->dsn_flags & rf_dsnflags)
3051 {
3052 BOOL first = TRUE;
3053
3054 Ustrcpy(p, US" NOTIFY=");
3055 while (*p) p++;
3056 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3057 {
3058 if (!first) *p++ = ',';
3059 first = FALSE;
3060 Ustrcpy(p, rf_names[i]);
3061 while (*p) p++;
3062 }
3063 }
3064
3065 if (addr->dsn_orcpt)
3066 {
3067 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3068 addr->dsn_orcpt);
3069 while (*p) p++;
3070 }
3071 }
3072 }
3073
3074
3075
3076 /*
3077 Return:
3078 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3079 -1 MAIL response error
3080 -2 any non-MAIL read i/o error
3081 -3 non-MAIL response timeout
3082 -4 internal error; channel still usable
3083 -5 transmit failed
3084 */
3085
3086 int
3087 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3088 {
3089 address_item * addr;
3090 int address_count, pipe_limit;
3091 int rc;
3092
3093 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3094 {
3095 *yield = ERROR;
3096 return -4;
3097 }
3098
3099 /* From here until we send the DATA command, we can make use of PIPELINING
3100 if the server host supports it. The code has to be able to check the responses
3101 at any point, for when the buffer fills up, so we write it totally generally.
3102 When PIPELINING is off, each command written reports that it has flushed the
3103 buffer. */
3104
3105 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3106
3107 {
3108 uschar * s = sx->from_addr;
3109 #ifdef SUPPORT_I18N
3110 uschar * errstr = NULL;
3111
3112 /* If we must downconvert, do the from-address here. Remember we had to
3113 for the to-addresses (done below), and also (ugly) for re-doing when building
3114 the delivery log line. */
3115
3116 if ( sx->addrlist->prop.utf8_msg
3117 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3118 )
3119 {
3120 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3121 {
3122 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3123 *yield = ERROR;
3124 return -4;
3125 }
3126 setflag(sx->addrlist, af_utf8_downcvt);
3127 }
3128 #endif
3129
3130 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3131 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3132 }
3133
3134 mail_command = string_copy(big_buffer); /* Save for later error message */
3135
3136 switch(rc)
3137 {
3138 case -1: /* Transmission error */
3139 return -5;
3140
3141 case +1: /* Cmd was sent */
3142 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3143 (SOB sx->conn_args.ob)->command_timeout))
3144 {
3145 if (errno == 0 && sx->buffer[0] == '4')
3146 {
3147 errno = ERRNO_MAIL4XX;
3148 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3149 }
3150 return -1;
3151 }
3152 sx->pending_MAIL = FALSE;
3153 break;
3154
3155 /* otherwise zero: command queued for pipeline */
3156 }
3157
3158 /* Pass over all the relevant recipient addresses for this host, which are the
3159 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3160 several before we have to read the responses for those seen so far. This
3161 checking is done by a subroutine because it also needs to be done at the end.
3162 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3163 the next one if not all are sent.
3164
3165 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3166 last address because we want to abort if any recipients have any kind of
3167 problem, temporary or permanent. We know that all recipient addresses will have
3168 the PENDING_DEFER status, because only one attempt is ever made, and we know
3169 that max_rcpt will be large, so all addresses will be done at once.
3170
3171 For verify we flush the pipeline after any (the only) rcpt address. */
3172
3173 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3174 addr && address_count < sx->max_rcpt;
3175 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3176 {
3177 int cmds_sent;
3178 BOOL no_flush;
3179 uschar * rcpt_addr;
3180
3181 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3182 ? dsn_support_yes : dsn_support_no;
3183
3184 address_count++;
3185 if (pipe_limit-- <= 0)
3186 { no_flush = FALSE; pipe_limit = 100; }
3187 else
3188 no_flush = pipelining_active && !sx->verify
3189 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3190
3191 build_rcptcmd_options(sx, addr);
3192
3193 /* Now send the RCPT command, and process outstanding responses when
3194 necessary. After a timeout on RCPT, we just end the function, leaving the
3195 yield as OK, because this error can often mean that there is a problem with
3196 just one address, so we don't want to delay the host. */
3197
3198 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3199
3200 #ifdef SUPPORT_I18N
3201 if ( testflag(sx->addrlist, af_utf8_downcvt)
3202 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3203 )
3204 {
3205 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3206 errno = ERRNO_EXPANDFAIL;
3207 return -5; /*XXX too harsh? */
3208 }
3209 #endif
3210
3211 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3212 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3213
3214 if (cmds_sent < 0) return -5;
3215 if (cmds_sent > 0)
3216 {
3217 switch(sync_responses(sx, cmds_sent, 0))
3218 {
3219 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3220 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3221 break;
3222
3223 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3224 if (!sx->lmtp) /* can't tell about progress yet */
3225 sx->completed_addr = TRUE;
3226 case 0: /* No 2xx or 5xx, but no probs */
3227 /* If any RCPT got a 452 response then next_addr has been updated
3228 for restarting with a new MAIL on the same connection. Send no more
3229 RCPTs for this MAIL. */
3230
3231 if (sx->RCPT_452)
3232 {
3233 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3234 sx->RCPT_452 = FALSE;
3235 /* sx->next_addr has been reset for fast_retry */
3236 return 0;
3237 }
3238 break;
3239
3240 case -1: return -3; /* Timeout on RCPT */
3241 case -2: return -2; /* non-MAIL read i/o error */
3242 default: return -1; /* any MAIL error */
3243
3244 #ifndef DISABLE_PIPE_CONNECT
3245 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3246 case -5: return -1; /* TLS first-read error */
3247 #endif
3248 }
3249 }
3250 } /* Loop for next address */
3251
3252 sx->next_addr = addr;
3253 return 0;
3254 }
3255
3256
3257 #ifndef DISABLE_TLS
3258 /*****************************************************
3259 * Proxy TLS connection for another transport process *
3260 ******************************************************/
3261 /*
3262 Close the unused end of the pipe, fork once more, then use the given buffer
3263 as a staging area, and select on both the given fd and the TLS'd client-fd for
3264 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3265 Do blocking full-size writes, and reads under a timeout. Once both input
3266 channels are closed, exit the process.
3267
3268 Arguments:
3269 ct_ctx tls context
3270 buf space to use for buffering
3271 bufsiz size of buffer
3272 pfd pipe filedescriptor array; [0] is comms to proxied process
3273 timeout per-read timeout, seconds
3274
3275 Does not return.
3276 */
3277
3278 void
3279 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3280 int timeout)
3281 {
3282 fd_set rfds, efds;
3283 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3284 int rc, i;
3285
3286 close(pfd[1]);
3287 if ((rc = exim_fork(US"tls-proxy")))
3288 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);