1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
17 optionlist smtp_transport_options
[] = {
18 { "*expand_multi_domain", opt_stringptr
| opt_hidden
| opt_public
,
19 (void *)offsetof(transport_instance
, expand_multi_domain
) },
20 { "*expand_retry_include_ip_address", opt_stringptr
| opt_hidden
,
21 (void *)(offsetof(smtp_transport_options_block
, expand_retry_include_ip_address
)) },
23 { "address_retry_include_sender", opt_bool
,
24 (void *)offsetof(smtp_transport_options_block
, address_retry_include_sender
) },
25 { "allow_localhost", opt_bool
,
26 (void *)offsetof(smtp_transport_options_block
, allow_localhost
) },
27 #ifdef EXPERIMENTAL_ARC
28 { "arc_sign", opt_stringptr
,
29 (void *)offsetof(smtp_transport_options_block
, arc_sign
) },
31 { "authenticated_sender", opt_stringptr
,
32 (void *)offsetof(smtp_transport_options_block
, authenticated_sender
) },
33 { "authenticated_sender_force", opt_bool
,
34 (void *)offsetof(smtp_transport_options_block
, authenticated_sender_force
) },
35 { "command_timeout", opt_time
,
36 (void *)offsetof(smtp_transport_options_block
, command_timeout
) },
37 { "connect_timeout", opt_time
,
38 (void *)offsetof(smtp_transport_options_block
, connect_timeout
) },
39 { "connection_max_messages", opt_int
| opt_public
,
40 (void *)offsetof(transport_instance
, connection_max_messages
) },
42 { "dane_require_tls_ciphers", opt_stringptr
,
43 (void *)offsetof(smtp_transport_options_block
, dane_require_tls_ciphers
) },
45 { "data_timeout", opt_time
,
46 (void *)offsetof(smtp_transport_options_block
, data_timeout
) },
47 { "delay_after_cutoff", opt_bool
,
48 (void *)offsetof(smtp_transport_options_block
, delay_after_cutoff
) },
50 { "dkim_canon", opt_stringptr
,
51 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_canon
) },
52 { "dkim_domain", opt_stringptr
,
53 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_domain
) },
54 { "dkim_hash", opt_stringptr
,
55 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_hash
) },
56 { "dkim_identity", opt_stringptr
,
57 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_identity
) },
58 { "dkim_private_key", opt_stringptr
,
59 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_private_key
) },
60 { "dkim_selector", opt_stringptr
,
61 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_selector
) },
62 { "dkim_sign_headers", opt_stringptr
,
63 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_sign_headers
) },
64 { "dkim_strict", opt_stringptr
,
65 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_strict
) },
66 { "dkim_timestamps", opt_stringptr
,
67 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_timestamps
) },
69 { "dns_qualify_single", opt_bool
,
70 (void *)offsetof(smtp_transport_options_block
, dns_qualify_single
) },
71 { "dns_search_parents", opt_bool
,
72 (void *)offsetof(smtp_transport_options_block
, dns_search_parents
) },
73 { "dnssec_request_domains", opt_stringptr
,
74 (void *)offsetof(smtp_transport_options_block
, dnssec
.request
) },
75 { "dnssec_require_domains", opt_stringptr
,
76 (void *)offsetof(smtp_transport_options_block
, dnssec
.require
) },
77 { "dscp", opt_stringptr
,
78 (void *)offsetof(smtp_transport_options_block
, dscp
) },
79 { "fallback_hosts", opt_stringptr
,
80 (void *)offsetof(smtp_transport_options_block
, fallback_hosts
) },
81 { "final_timeout", opt_time
,
82 (void *)offsetof(smtp_transport_options_block
, final_timeout
) },
83 { "gethostbyname", opt_bool
,
84 (void *)offsetof(smtp_transport_options_block
, gethostbyname
) },
85 { "helo_data", opt_stringptr
,
86 (void *)offsetof(smtp_transport_options_block
, helo_data
) },
87 { "hosts", opt_stringptr
,
88 (void *)offsetof(smtp_transport_options_block
, hosts
) },
89 { "hosts_avoid_esmtp", opt_stringptr
,
90 (void *)offsetof(smtp_transport_options_block
, hosts_avoid_esmtp
) },
91 { "hosts_avoid_pipelining", opt_stringptr
,
92 (void *)offsetof(smtp_transport_options_block
, hosts_avoid_pipelining
) },
94 { "hosts_avoid_tls", opt_stringptr
,
95 (void *)offsetof(smtp_transport_options_block
, hosts_avoid_tls
) },
97 { "hosts_max_try", opt_int
,
98 (void *)offsetof(smtp_transport_options_block
, hosts_max_try
) },
99 { "hosts_max_try_hardlimit", opt_int
,
100 (void *)offsetof(smtp_transport_options_block
, hosts_max_try_hardlimit
) },
102 { "hosts_nopass_tls", opt_stringptr
,
103 (void *)offsetof(smtp_transport_options_block
, hosts_nopass_tls
) },
104 { "hosts_noproxy_tls", opt_stringptr
,
105 (void *)offsetof(smtp_transport_options_block
, hosts_noproxy_tls
) },
107 { "hosts_override", opt_bool
,
108 (void *)offsetof(smtp_transport_options_block
, hosts_override
) },
109 #ifdef EXPERIMENTAL_PIPE_CONNECT
110 { "hosts_pipe_connect", opt_stringptr
,
111 (void *)offsetof(smtp_transport_options_block
, hosts_pipe_connect
) },
113 { "hosts_randomize", opt_bool
,
114 (void *)offsetof(smtp_transport_options_block
, hosts_randomize
) },
115 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
116 { "hosts_request_ocsp", opt_stringptr
,
117 (void *)offsetof(smtp_transport_options_block
, hosts_request_ocsp
) },
119 { "hosts_require_auth", opt_stringptr
,
120 (void *)offsetof(smtp_transport_options_block
, hosts_require_auth
) },
123 { "hosts_require_dane", opt_stringptr
,
124 (void *)offsetof(smtp_transport_options_block
, hosts_require_dane
) },
126 # ifndef DISABLE_OCSP
127 { "hosts_require_ocsp", opt_stringptr
,
128 (void *)offsetof(smtp_transport_options_block
, hosts_require_ocsp
) },
130 { "hosts_require_tls", opt_stringptr
,
131 (void *)offsetof(smtp_transport_options_block
, hosts_require_tls
) },
133 { "hosts_try_auth", opt_stringptr
,
134 (void *)offsetof(smtp_transport_options_block
, hosts_try_auth
) },
135 { "hosts_try_chunking", opt_stringptr
,
136 (void *)offsetof(smtp_transport_options_block
, hosts_try_chunking
) },
137 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
138 { "hosts_try_dane", opt_stringptr
,
139 (void *)offsetof(smtp_transport_options_block
, hosts_try_dane
) },
141 { "hosts_try_fastopen", opt_stringptr
,
142 (void *)offsetof(smtp_transport_options_block
, hosts_try_fastopen
) },
144 { "hosts_try_prdr", opt_stringptr
,
145 (void *)offsetof(smtp_transport_options_block
, hosts_try_prdr
) },
148 { "hosts_verify_avoid_tls", opt_stringptr
,
149 (void *)offsetof(smtp_transport_options_block
, hosts_verify_avoid_tls
) },
151 { "interface", opt_stringptr
,
152 (void *)offsetof(smtp_transport_options_block
, interface
) },
153 { "keepalive", opt_bool
,
154 (void *)offsetof(smtp_transport_options_block
, keepalive
) },
155 { "lmtp_ignore_quota", opt_bool
,
156 (void *)offsetof(smtp_transport_options_block
, lmtp_ignore_quota
) },
157 { "max_rcpt", opt_int
| opt_public
,
158 (void *)offsetof(transport_instance
, max_addresses
) },
159 { "multi_domain", opt_expand_bool
| opt_public
,
160 (void *)offsetof(transport_instance
, multi_domain
) },
161 { "port", opt_stringptr
,
162 (void *)offsetof(smtp_transport_options_block
, port
) },
163 { "protocol", opt_stringptr
,
164 (void *)offsetof(smtp_transport_options_block
, protocol
) },
165 { "retry_include_ip_address", opt_expand_bool
,
166 (void *)offsetof(smtp_transport_options_block
, retry_include_ip_address
) },
167 { "serialize_hosts", opt_stringptr
,
168 (void *)offsetof(smtp_transport_options_block
, serialize_hosts
) },
169 { "size_addition", opt_int
,
170 (void *)offsetof(smtp_transport_options_block
, size_addition
) },
172 { "socks_proxy", opt_stringptr
,
173 (void *)offsetof(smtp_transport_options_block
, socks_proxy
) },
176 { "tls_certificate", opt_stringptr
,
177 (void *)offsetof(smtp_transport_options_block
, tls_certificate
) },
178 { "tls_crl", opt_stringptr
,
179 (void *)offsetof(smtp_transport_options_block
, tls_crl
) },
180 { "tls_dh_min_bits", opt_int
,
181 (void *)offsetof(smtp_transport_options_block
, tls_dh_min_bits
) },
182 { "tls_privatekey", opt_stringptr
,
183 (void *)offsetof(smtp_transport_options_block
, tls_privatekey
) },
184 { "tls_require_ciphers", opt_stringptr
,
185 (void *)offsetof(smtp_transport_options_block
, tls_require_ciphers
) },
186 { "tls_sni", opt_stringptr
,
187 (void *)offsetof(smtp_transport_options_block
, tls_sni
) },
188 { "tls_tempfail_tryclear", opt_bool
,
189 (void *)offsetof(smtp_transport_options_block
, tls_tempfail_tryclear
) },
190 { "tls_try_verify_hosts", opt_stringptr
,
191 (void *)offsetof(smtp_transport_options_block
, tls_try_verify_hosts
) },
192 { "tls_verify_cert_hostnames", opt_stringptr
,
193 (void *)offsetof(smtp_transport_options_block
,tls_verify_cert_hostnames
)},
194 { "tls_verify_certificates", opt_stringptr
,
195 (void *)offsetof(smtp_transport_options_block
, tls_verify_certificates
) },
196 { "tls_verify_hosts", opt_stringptr
,
197 (void *)offsetof(smtp_transport_options_block
, tls_verify_hosts
) },
200 { "utf8_downconvert", opt_stringptr
,
201 (void *)offsetof(smtp_transport_options_block
, utf8_downconvert
) },
205 /* Size of the options list. An extern variable has to be used so that its
206 address can appear in the tables drtables.c. */
208 int smtp_transport_options_count
= nelem(smtp_transport_options
);
214 smtp_transport_options_block smtp_transport_option_defaults
= {0};
215 void smtp_transport_init(transport_instance
*tblock
) {}
216 BOOL
smtp_transport_entry(transport_instance
*tblock
, address_item
*addr
) {return FALSE
;}
217 void smtp_transport_closedown(transport_instance
*tblock
) {}
219 #else /*!MACRO_PREDEF*/
222 /* Default private options block for the smtp transport. */
224 smtp_transport_options_block smtp_transport_option_defaults
= {
226 .fallback_hosts
= NULL
,
228 .fallback_hostlist
= NULL
,
229 .helo_data
= US
"$primary_hostname",
232 .protocol
= US
"smtp",
234 .serialize_hosts
= NULL
,
235 .hosts_try_auth
= NULL
,
236 .hosts_require_auth
= NULL
,
237 .hosts_try_chunking
= US
"*",
239 .hosts_try_dane
= NULL
,
240 .hosts_require_dane
= NULL
,
241 .dane_require_tls_ciphers
= NULL
,
243 .hosts_try_fastopen
= NULL
,
245 .hosts_try_prdr
= US
"*",
248 .hosts_request_ocsp
= US
"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
249 .hosts_require_ocsp
= NULL
,
251 .hosts_require_tls
= NULL
,
252 .hosts_avoid_tls
= NULL
,
253 .hosts_verify_avoid_tls
= NULL
,
254 .hosts_avoid_pipelining
= NULL
,
255 #ifdef EXPERIMENTAL_PIPE_CONNECT
256 .hosts_pipe_connect
= NULL
,
258 .hosts_avoid_esmtp
= NULL
,
260 .hosts_nopass_tls
= NULL
,
261 .hosts_noproxy_tls
= US
"*",
263 .command_timeout
= 5*60,
264 .connect_timeout
= 5*60,
265 .data_timeout
= 5*60,
266 .final_timeout
= 10*60,
267 .size_addition
= 1024,
269 .hosts_max_try_hardlimit
= 50,
270 .address_retry_include_sender
= TRUE
,
271 .allow_localhost
= FALSE
,
272 .authenticated_sender_force
= FALSE
,
273 .gethostbyname
= FALSE
,
274 .dns_qualify_single
= TRUE
,
275 .dns_search_parents
= FALSE
,
276 .dnssec
= { .request
=NULL
, .require
=NULL
},
277 .delay_after_cutoff
= TRUE
,
278 .hosts_override
= FALSE
,
279 .hosts_randomize
= FALSE
,
281 .lmtp_ignore_quota
= FALSE
,
282 .expand_retry_include_ip_address
= NULL
,
283 .retry_include_ip_address
= TRUE
,
288 .tls_certificate
= NULL
,
290 .tls_privatekey
= NULL
,
291 .tls_require_ciphers
= NULL
,
293 .tls_verify_certificates
= US
"system",
294 .tls_dh_min_bits
= EXIM_CLIENT_DH_DEFAULT_MIN_BITS
,
295 .tls_tempfail_tryclear
= TRUE
,
296 .tls_verify_hosts
= NULL
,
297 .tls_try_verify_hosts
= US
"*",
298 .tls_verify_cert_hostnames
= US
"*",
301 .utf8_downconvert
= NULL
,
305 {.dkim_domain
= NULL
,
306 .dkim_identity
= NULL
,
307 .dkim_private_key
= NULL
,
308 .dkim_selector
= NULL
,
310 .dkim_sign_headers
= NULL
,
312 .dkim_hash
= US
"sha256",
313 .dkim_timestamps
= NULL
,
314 .dot_stuffed
= FALSE
,
315 .force_bodyhash
= FALSE
,
316 # ifdef EXPERIMENTAL_ARC
317 .arc_signspec
= NULL
,
320 # ifdef EXPERIMENTAL_ARC
326 /* some DSN flags for use later */
328 static int rf_list
[] = {rf_notify_never
, rf_notify_success
,
329 rf_notify_failure
, rf_notify_delay
};
331 static uschar
*rf_names
[] = { US
"NEVER", US
"SUCCESS", US
"FAILURE", US
"DELAY" };
337 static uschar
*smtp_command
; /* Points to last cmd for error messages */
338 static uschar
*mail_command
; /* Points to MAIL cmd for error messages */
339 static uschar
*data_command
= US
""; /* Points to DATA cmd for error messages */
340 static BOOL update_waiting
; /* TRUE to update the "wait" database */
342 /*XXX move to smtp_context */
343 static BOOL pipelining_active
; /* current transaction is in pipe mode */
346 static unsigned ehlo_response(uschar
* buf
, unsigned checks
);
349 /*************************************************
350 * Setup entry point *
351 *************************************************/
353 /* This function is called when the transport is about to be used,
354 but before running it in a sub-process. It is used for two things:
356 (1) To set the fallback host list in addresses, when delivering.
357 (2) To pass back the interface, port, protocol, and other options, for use
358 during callout verification.
361 tblock pointer to the transport instance block
362 addrlist list of addresses about to be transported
363 tf if not NULL, pointer to block in which to return options
364 uid the uid that will be set (not used)
365 gid the gid that will be set (not used)
366 errmsg place for error message (not used)
368 Returns: OK always (FAIL, DEFER not used)
372 smtp_transport_setup(transport_instance
*tblock
, address_item
*addrlist
,
373 transport_feedback
*tf
, uid_t uid
, gid_t gid
, uschar
**errmsg
)
375 smtp_transport_options_block
*ob
= SOB tblock
->options_block
;
377 errmsg
= errmsg
; /* Keep picky compilers happy */
381 /* Pass back options if required. This interface is getting very messy. */
385 tf
->interface
= ob
->interface
;
387 tf
->protocol
= ob
->protocol
;
388 tf
->hosts
= ob
->hosts
;
389 tf
->hosts_override
= ob
->hosts_override
;
390 tf
->hosts_randomize
= ob
->hosts_randomize
;
391 tf
->gethostbyname
= ob
->gethostbyname
;
392 tf
->qualify_single
= ob
->dns_qualify_single
;
393 tf
->search_parents
= ob
->dns_search_parents
;
394 tf
->helo_data
= ob
->helo_data
;
397 /* Set the fallback host list for all the addresses that don't have fallback
398 host lists, provided that the local host wasn't present in the original host
401 if (!testflag(addrlist
, af_local_host_removed
))
402 for (; addrlist
; addrlist
= addrlist
->next
)
403 if (!addrlist
->fallback_hosts
) addrlist
->fallback_hosts
= ob
->fallback_hostlist
;
410 /*************************************************
411 * Initialization entry point *
412 *************************************************/
414 /* Called for each instance, after its options have been read, to
415 enable consistency checks to be done, or anything else that needs
418 Argument: pointer to the transport instance block
423 smtp_transport_init(transport_instance
*tblock
)
425 smtp_transport_options_block
*ob
= SOB tblock
->options_block
;
427 /* Retry_use_local_part defaults FALSE if unset */
429 if (tblock
->retry_use_local_part
== TRUE_UNSET
)
430 tblock
->retry_use_local_part
= FALSE
;
432 /* Set the default port according to the protocol */
435 ob
->port
= strcmpic(ob
->protocol
, US
"lmtp") == 0
437 : strcmpic(ob
->protocol
, US
"smtps") == 0
438 ? US
"smtps" : US
"smtp";
440 /* Set up the setup entry point, to be called before subprocesses for this
443 tblock
->setup
= smtp_transport_setup
;
445 /* Complain if any of the timeouts are zero. */
447 if (ob
->command_timeout
<= 0 || ob
->data_timeout
<= 0 ||
448 ob
->final_timeout
<= 0)
449 log_write(0, LOG_PANIC_DIE
|LOG_CONFIG
,
450 "command, data, or final timeout value is zero for %s transport",
453 /* If hosts_override is set and there are local hosts, set the global
454 flag that stops verify from showing router hosts. */
456 if (ob
->hosts_override
&& ob
->hosts
!= NULL
) tblock
->overrides_hosts
= TRUE
;
458 /* If there are any fallback hosts listed, build a chain of host items
459 for them, but do not do any lookups at this time. */
461 host_build_hostlist(&(ob
->fallback_hostlist
), ob
->fallback_hosts
, FALSE
);
468 /*************************************************
469 * Set delivery info into all active addresses *
470 *************************************************/
472 /* Only addresses whose status is >= PENDING are relevant. A lesser
473 status means that an address is not currently being processed.
476 addrlist points to a chain of addresses
477 errno_value to put in each address's errno field
478 msg to put in each address's message field
479 rc to put in each address's transport_return field
480 pass_message if TRUE, set the "pass message" flag in the address
481 host if set, mark addrs as having used this host
482 smtp_greeting from peer
483 helo_response from peer
485 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
486 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
487 this particular type of timeout.
493 set_errno(address_item
*addrlist
, int errno_value
, uschar
*msg
, int rc
,
494 BOOL pass_message
, host_item
* host
495 #ifdef EXPERIMENTAL_DSN_INFO
496 , const uschar
* smtp_greeting
, const uschar
* helo_response
502 if (errno_value
== ERRNO_CONNECTTIMEOUT
)
504 errno_value
= ETIMEDOUT
;
505 orvalue
= RTEF_CTOUT
;
507 for (addr
= addrlist
; addr
; addr
= addr
->next
)
508 if (addr
->transport_return
>= PENDING
)
510 addr
->basic_errno
= errno_value
;
511 addr
->more_errno
|= orvalue
;
515 if (pass_message
) setflag(addr
, af_pass_message
);
517 addr
->transport_return
= rc
;
520 addr
->host_used
= host
;
521 #ifdef EXPERIMENTAL_DSN_INFO
523 {uschar
* s
= Ustrchr(smtp_greeting
, '\n'); if (s
) *s
= '\0';}
524 addr
->smtp_greeting
= smtp_greeting
;
527 {uschar
* s
= Ustrchr(helo_response
, '\n'); if (s
) *s
= '\0';}
528 addr
->helo_response
= helo_response
;
535 set_errno_nohost(address_item
*addrlist
, int errno_value
, uschar
*msg
, int rc
,
538 set_errno(addrlist
, errno_value
, msg
, rc
, pass_message
, NULL
539 #ifdef EXPERIMENTAL_DSN_INFO
546 /*************************************************
547 * Check an SMTP response *
548 *************************************************/
550 /* This function is given an errno code and the SMTP response buffer
551 to analyse, together with the host identification for generating messages. It
552 sets an appropriate message and puts the first digit of the response code into
553 the yield variable. If no response was actually read, a suitable digit is
557 host the current host, to get its name for messages
558 errno_value pointer to the errno value
559 more_errno from the top address for use with ERRNO_FILTER_FAIL
560 buffer the SMTP response buffer
561 yield where to put a one-digit SMTP response code
562 message where to put an error message
563 pass_message set TRUE if message is an SMTP response
565 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
569 check_response(host_item
*host
, int *errno_value
, int more_errno
,
570 uschar
*buffer
, int *yield
, uschar
**message
, BOOL
*pass_message
)
572 uschar
* pl
= pipelining_active ? US
"pipelined " : US
"";
575 *yield
= '4'; /* Default setting is to give a temporary error */
579 case ETIMEDOUT
: /* Handle response timeout */
580 *message
= US
string_sprintf("SMTP timeout after %s%s",
582 if (transport_count
> 0)
583 *message
= US
string_sprintf("%s (%d bytes written)", *message
,
587 case ERRNO_SMTPFORMAT
: /* Handle malformed SMTP response */
588 s
= string_printing(buffer
);
589 while (isspace(*s
)) s
++;
591 ?
string_sprintf("Malformed SMTP reply (an empty line) "
592 "in response to %s%s", pl
, smtp_command
)
593 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
594 pl
, smtp_command
, s
);
597 case ERRNO_FILTER_FAIL
: /* Handle a failed filter process error;
598 can't send QUIT as we mustn't end the DATA. */
599 *message
= string_sprintf("transport filter process failed (%d)%s",
601 more_errno
== EX_EXECFAILED ?
": unable to execute command" : "");
604 case ERRNO_CHHEADER_FAIL
: /* Handle a failed add_headers expansion;
605 can't send QUIT as we mustn't end the DATA. */
607 string_sprintf("failed to expand headers_add or headers_remove: %s",
608 expand_string_message
);
611 case ERRNO_WRITEINCOMPLETE
: /* failure to write a complete data block */
612 *message
= string_sprintf("failed to write a data block");
616 case ERRNO_UTF8_FWD
: /* no advertised SMTPUTF8, for international message */
617 *message
= US
"utf8 support required but not offered for forwarding";
618 DEBUG(D_deliver
|D_transport
) debug_printf("%s\n", *message
);
623 /* Handle error responses from the remote mailer. */
627 *message
= string_sprintf("SMTP error from remote mail server after %s%s: "
628 "%s", pl
, smtp_command
, s
= string_printing(buffer
));
629 *pass_message
= TRUE
;
634 /* No data was read. If there is no errno, this must be the EOF (i.e.
635 connection closed) case, which causes deferral. An explicit connection reset
636 error has the same effect. Otherwise, put the host's identity in the message,
637 leaving the errno value to be interpreted as well. In all cases, we have to
638 assume the connection is now dead. */
640 if (*errno_value
== 0 || *errno_value
== ECONNRESET
)
642 *errno_value
= ERRNO_SMTPCLOSED
;
643 *message
= US
string_sprintf("Remote host closed connection "
644 "in response to %s%s", pl
, smtp_command
);
647 *message
= US
string_sprintf("%s [%s]", host
->name
, host
->address
);
654 /*************************************************
655 * Write error message to logs *
656 *************************************************/
658 /* This writes to the main log and to the message log.
661 host the current host
662 detail the current message (addr_item->message)
663 basic_errno the errno (addr_item->basic_errno)
669 write_logs(const host_item
*host
, const uschar
*suffix
, int basic_errno
)
671 gstring
* message
= LOGGING(outgoing_port
)
672 ?
string_fmt_append(NULL
, "H=%s [%s]:%d", host
->name
, host
->address
,
673 host
->port
== PORT_NONE ?
25 : host
->port
)
674 : string_fmt_append(NULL
, "H=%s [%s]", host
->name
, host
->address
);
678 message
= string_fmt_append(message
, ": %s", suffix
);
680 message
= string_fmt_append(message
, ": %s", strerror(basic_errno
));
683 message
= string_fmt_append(message
, " %s", exim_errstr(basic_errno
));
685 log_write(0, LOG_MAIN
, "%s", string_from_gstring(message
));
686 deliver_msglog("%s %s\n", tod_stamp(tod_log
), message
->s
);
690 msglog_line(host_item
* host
, uschar
* message
)
692 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log
),
693 host
->name
, host
->address
, message
);
698 #ifndef DISABLE_EVENT
699 /*************************************************
700 * Post-defer action *
701 *************************************************/
703 /* This expands an arbitrary per-transport string.
704 It might, for example, be used to write to the database log.
707 addr the address item containing error information
708 host the current host
714 deferred_event_raise(address_item
*addr
, host_item
*host
)
716 uschar
* action
= addr
->transport
->event_action
;
717 const uschar
* save_domain
;
723 save_domain
= deliver_domain
;
724 save_local
= deliver_localpart
;
726 /*XXX would ip & port already be set up? */
727 deliver_host_address
= string_copy(host
->address
);
728 deliver_host_port
= host
->port
== PORT_NONE ?
25 : host
->port
;
729 event_defer_errno
= addr
->basic_errno
;
731 router_name
= addr
->router
->name
;
732 transport_name
= addr
->transport
->name
;
733 deliver_domain
= addr
->domain
;
734 deliver_localpart
= addr
->local_part
;
736 (void) event_raise(action
, US
"msg:host:defer",
738 ? addr
->basic_errno
> 0
739 ?
string_sprintf("%s: %s", addr
->message
, strerror(addr
->basic_errno
))
740 : string_copy(addr
->message
)
741 : addr
->basic_errno
> 0
742 ?
string_copy(US
strerror(addr
->basic_errno
))
745 deliver_localpart
= save_local
;
746 deliver_domain
= save_domain
;
747 router_name
= transport_name
= NULL
;
751 /*************************************************
752 * Reap SMTP specific responses *
753 *************************************************/
755 smtp_discard_responses(smtp_context
* sx
, smtp_transport_options_block
* ob
,
758 uschar flushbuffer
[4096];
762 if (!smtp_read_response(sx
, flushbuffer
, sizeof(flushbuffer
),
763 '2', ob
->command_timeout
)
764 && (errno
!= 0 || flushbuffer
[0] == 0))
771 /* Return boolean success */
774 smtp_reap_banner(smtp_context
* sx
)
776 BOOL good_response
= smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
777 '2', (SOB sx
->conn_args
.ob
)->command_timeout
);
778 #ifdef EXPERIMENTAL_DSN_INFO
779 sx
->smtp_greeting
= string_copy(sx
->buffer
);
781 return good_response
;
785 smtp_reap_ehlo(smtp_context
* sx
)
787 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
788 (SOB sx
->conn_args
.ob
)->command_timeout
))
790 if (errno
!= 0 || sx
->buffer
[0] == 0 || sx
->lmtp
)
792 #ifdef EXPERIMENTAL_DSN_INFO
793 sx
->helo_response
= string_copy(sx
->buffer
);
799 #ifdef EXPERIMENTAL_DSN_INFO
800 sx
->helo_response
= string_copy(sx
->buffer
);
807 #ifdef EXPERIMENTAL_PIPE_CONNECT
809 ehlo_cache_key(const smtp_context
* sx
)
811 host_item
* host
= sx
->conn_args
.host
;
812 return Ustrchr(host
->address
, ':')
813 ?
string_sprintf("[%s]:%d.EHLO", host
->address
,
814 host
->port
== PORT_NONE ? sx
->port
: host
->port
)
815 : string_sprintf("%s:%d.EHLO", host
->address
,
816 host
->port
== PORT_NONE ? sx
->port
: host
->port
);
820 write_ehlo_cache_entry(const smtp_context
* sx
)
822 open_db dbblock
, * dbm_file
;
824 if ((dbm_file
= dbfn_open(US
"misc", O_RDWR
, &dbblock
, TRUE
)))
826 uschar
* ehlo_resp_key
= ehlo_cache_key(sx
);
827 dbdata_ehlo_resp er
= { .data
= sx
->ehlo_resp
};
829 HDEBUG(D_transport
) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
830 sx
->ehlo_resp
.cleartext_features
, sx
->ehlo_resp
.cleartext_auths
,
831 sx
->ehlo_resp
.crypted_features
, sx
->ehlo_resp
.crypted_auths
);
833 dbfn_write(dbm_file
, ehlo_resp_key
, &er
, (int)sizeof(er
));
834 dbfn_close(dbm_file
);
839 invalidate_ehlo_cache_entry(smtp_context
* sx
)
841 open_db dbblock
, * dbm_file
;
843 if ( sx
->early_pipe_active
844 && (dbm_file
= dbfn_open(US
"misc", O_RDWR
, &dbblock
, TRUE
)))
846 uschar
* ehlo_resp_key
= ehlo_cache_key(sx
);
847 dbfn_delete(dbm_file
, ehlo_resp_key
);
848 dbfn_close(dbm_file
);
853 read_ehlo_cache_entry(smtp_context
* sx
)
858 if (!(dbm_file
= dbfn_open(US
"misc", O_RDONLY
, &dbblock
, FALSE
)))
859 { DEBUG(D_transport
) debug_printf("ehlo-cache: no misc DB\n"); }
862 uschar
* ehlo_resp_key
= ehlo_cache_key(sx
);
863 dbdata_ehlo_resp
* er
;
865 if (!(er
= dbfn_read(dbm_file
, ehlo_resp_key
)))
866 { DEBUG(D_transport
) debug_printf("no ehlo-resp record\n"); }
867 else if (time(NULL
) - er
->time_stamp
> retry_data_expire
)
869 DEBUG(D_transport
) debug_printf("ehlo-resp record too old\n");
870 dbfn_close(dbm_file
);
871 if ((dbm_file
= dbfn_open(US
"misc", O_RDWR
, &dbblock
, TRUE
)))
872 dbfn_delete(dbm_file
, ehlo_resp_key
);
876 sx
->ehlo_resp
= er
->data
;
877 dbfn_close(dbm_file
);
878 DEBUG(D_transport
) debug_printf(
879 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
880 er
->data
.cleartext_features
, er
->data
.crypted_features
);
883 dbfn_close(dbm_file
);
890 /* Return an auths bitmap for the set of AUTH methods offered by the server
891 which match our authenticators. */
893 static unsigned short
894 study_ehlo_auths(smtp_context
* sx
)
899 unsigned short authbits
= 0;
901 if (!sx
->esmtp
) return 0;
902 if (!regex_AUTH
) regex_AUTH
= regex_must_compile(AUTHS_REGEX
, FALSE
, TRUE
);
903 if (!regex_match_and_setup(regex_AUTH
, sx
->buffer
, 0, -1)) return 0;
904 expand_nmax
= -1; /* reset */
905 names
= string_copyn(expand_nstring
[1], expand_nlength
[1]);
907 for (au
= auths
, authnum
= 0; au
; au
= au
->next
, authnum
++) if (au
->client
)
909 const uschar
* list
= names
;
913 while (string_nextinlist(&list
, &sep
, name
, sizeof(name
)))
914 if (strcmpic(au
->public_name
, name
) == 0)
915 { authbits
|= BIT(authnum
); break; }
919 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
920 tls_out
.active
.sock
>= 0 ?
"crypted" : "plaintext", names
, authbits
);
922 if (tls_out
.active
.sock
>= 0)
923 sx
->ehlo_resp
.crypted_auths
= authbits
;
925 sx
->ehlo_resp
.cleartext_auths
= authbits
;
932 /* Wait for and check responses for early-pipelining.
934 Called from the lower-level smtp_read_response() function
935 used for general code that assume synchronisation, if context
936 flags indicate outstanding early-pipelining commands. Also
937 called fom sync_responses() which handles pipelined commands.
940 sx smtp connection context
941 countp number of outstanding responses, adjusted on return
945 FAIL SMTP error in response
948 smtp_reap_early_pipe(smtp_context
* sx
, int * countp
)
950 BOOL pending_BANNER
= sx
->pending_BANNER
;
951 BOOL pending_EHLO
= sx
->pending_EHLO
;
953 sx
->pending_BANNER
= FALSE
; /* clear early to avoid recursion */
954 sx
->pending_EHLO
= FALSE
;
958 DEBUG(D_transport
) debug_printf("%s expect banner\n", __FUNCTION__
);
960 if (!smtp_reap_banner(sx
))
962 DEBUG(D_transport
) debug_printf("bad banner\n");
969 unsigned peer_offered
;
970 unsigned short authbits
= 0, * ap
;
972 DEBUG(D_transport
) debug_printf("%s expect ehlo\n", __FUNCTION__
);
974 if (!smtp_reap_ehlo(sx
))
976 DEBUG(D_transport
) debug_printf("bad response for EHLO\n");
980 /* Compare the actual EHLO response to the cached value we assumed;
981 on difference, dump or rewrite the cache and arrange for a retry. */
983 ap
= tls_out
.active
.sock
< 0
984 ?
&sx
->ehlo_resp
.cleartext_auths
: &sx
->ehlo_resp
.crypted_auths
;
986 peer_offered
= ehlo_response(sx
->buffer
,
987 (tls_out
.active
.sock
< 0 ? OPTION_TLS
: OPTION_REQUIRETLS
)
988 | OPTION_CHUNKING
| OPTION_PRDR
| OPTION_DSN
| OPTION_PIPE
| OPTION_SIZE
989 | OPTION_UTF8
| OPTION_EARLY_PIPE
991 if ( peer_offered
!= sx
->peer_offered
992 || (authbits
= study_ehlo_auths(sx
)) != *ap
)
995 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
996 tls_out
.active
.sock
< 0 ?
"cleartext" : "crypted",
997 sx
->peer_offered
, *ap
, peer_offered
, authbits
);
998 *(tls_out
.active
.sock
< 0
999 ?
&sx
->ehlo_resp
.cleartext_features
: &sx
->ehlo_resp
.crypted_features
) = peer_offered
;
1001 if (peer_offered
& OPTION_EARLY_PIPE
)
1002 write_ehlo_cache_entry(sx
);
1004 invalidate_ehlo_cache_entry(sx
);
1006 return OK
; /* just carry on */
1012 invalidate_ehlo_cache_entry(sx
);
1013 (void) smtp_discard_responses(sx
, sx
->conn_args
.ob
, *countp
);
1019 /*************************************************
1020 * Synchronize SMTP responses *
1021 *************************************************/
1023 /* This function is called from smtp_deliver() to receive SMTP responses from
1024 the server, and match them up with the commands to which they relate. When
1025 PIPELINING is not in use, this function is called after every command, and is
1026 therefore somewhat over-engineered, but it is simpler to use a single scheme
1027 that works both with and without PIPELINING instead of having two separate sets
1030 The set of commands that are buffered up with pipelining may start with MAIL
1031 and may end with DATA; in between are RCPT commands that correspond to the
1032 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1033 etc.) are never buffered.
1035 Errors after MAIL or DATA abort the whole process leaving the response in the
1036 buffer. After MAIL, pending responses are flushed, and the original command is
1037 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1038 permitted to reject some recipient addresses while accepting others. However
1039 certain errors clearly abort the whole process. Set the value in
1040 transport_return to PENDING_OK if the address is accepted. If there is a
1041 subsequent general error, it will get reset accordingly. If not, it will get
1042 converted to OK at the end.
1045 sx smtp connection context
1046 count the number of responses to read
1047 pending_DATA 0 if last command sent was not DATA
1048 +1 if previously had a good recipient
1049 -1 if not previously had a good recipient
1051 Returns: 3 if at least one address had 2xx and one had 5xx
1052 2 if at least one address had 5xx but none had 2xx
1053 1 if at least one host had a 2xx response, but none had 5xx
1054 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1055 -1 timeout while reading RCPT response
1056 -2 I/O or other non-response error for RCPT
1057 -3 DATA or MAIL failed - errno and buffer set
1058 -4 banner or EHLO failed (early-pipelining)
1062 sync_responses(smtp_context
* sx
, int count
, int pending_DATA
)
1064 address_item
* addr
= sx
->sync_addr
;
1065 smtp_transport_options_block
* ob
= sx
->conn_args
.ob
;
1068 #ifdef EXPERIMENTAL_PIPE_CONNECT
1069 if (smtp_reap_early_pipe(sx
, &count
) != OK
)
1073 /* Handle the response for a MAIL command. On error, reinstate the original
1074 command in big_buffer for error message use, and flush any further pending
1075 responses before returning, except after I/O errors and timeouts. */
1077 if (sx
->pending_MAIL
)
1079 DEBUG(D_transport
) debug_printf("%s expect mail\n", __FUNCTION__
);
1081 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
1082 '2', ob
->command_timeout
))
1084 DEBUG(D_transport
) debug_printf("bad response for MAIL\n");
1085 Ustrcpy(big_buffer
, mail_command
); /* Fits, because it came from there! */
1086 if (errno
== 0 && sx
->buffer
[0] != 0)
1089 if (sx
->buffer
[0] == '4')
1091 save_errno
= ERRNO_MAIL4XX
;
1092 addr
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
1094 count
= smtp_discard_responses(sx
, ob
, count
);
1098 if (pending_DATA
) count
--; /* Number of RCPT responses to come */
1099 while (count
-- > 0) /* Mark any pending addrs with the host used */
1101 while (addr
->transport_return
!= PENDING_DEFER
) addr
= addr
->next
;
1102 addr
->host_used
= sx
->conn_args
.host
;
1109 if (pending_DATA
) count
--; /* Number of RCPT responses to come */
1111 /* Read and handle the required number of RCPT responses, matching each one up
1112 with an address by scanning for the next address whose status is PENDING_DEFER.
1117 while (addr
->transport_return
!= PENDING_DEFER
)
1118 if (!(addr
= addr
->next
))
1121 /* The address was accepted */
1122 addr
->host_used
= sx
->conn_args
.host
;
1124 DEBUG(D_transport
) debug_printf("%s expect rcpt\n", __FUNCTION__
);
1125 if (smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
1126 '2', ob
->command_timeout
))
1129 addr
->transport_return
= PENDING_OK
;
1131 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1132 ensure that any address-specific retry record is expunged. We do this both
1133 for the basic key and for the version that also includes the sender. */
1135 if (testflag(addr
, af_dr_retry_exists
))
1137 uschar
*altkey
= string_sprintf("%s:<%s>", addr
->address_retry_key
,
1139 retry_add_item(addr
, altkey
, rf_delete
);
1140 retry_add_item(addr
, addr
->address_retry_key
, rf_delete
);
1144 /* Timeout while reading the response */
1146 else if (errno
== ETIMEDOUT
)
1148 uschar
*message
= string_sprintf("SMTP timeout after RCPT TO:<%s>",
1149 transport_rcpt_address(addr
, sx
->conn_args
.tblock
->rcpt_include_affixes
));
1150 set_errno_nohost(sx
->first_addr
, ETIMEDOUT
, message
, DEFER
, FALSE
);
1151 retry_add_item(addr
, addr
->address_retry_key
, 0);
1152 update_waiting
= FALSE
;
1156 /* Handle other errors in obtaining an SMTP response by returning -1. This
1157 will cause all the addresses to be deferred. Restore the SMTP command in
1158 big_buffer for which we are checking the response, so the error message
1161 else if (errno
!= 0 || sx
->buffer
[0] == 0)
1163 string_format(big_buffer
, big_buffer_size
, "RCPT TO:<%s>",
1164 transport_rcpt_address(addr
, sx
->conn_args
.tblock
->rcpt_include_affixes
));
1168 /* Handle SMTP permanent and temporary response codes. */
1173 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1174 "%s", transport_rcpt_address(addr
, sx
->conn_args
.tblock
->rcpt_include_affixes
),
1175 string_printing(sx
->buffer
));
1176 setflag(addr
, af_pass_message
);
1178 msglog_line(sx
->conn_args
.host
, addr
->message
);
1180 /* The response was 5xx */
1182 if (sx
->buffer
[0] == '5')
1184 addr
->transport_return
= FAIL
;
1188 /* The response was 4xx */
1192 addr
->transport_return
= DEFER
;
1193 addr
->basic_errno
= ERRNO_RCPT4XX
;
1194 addr
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
1198 #ifndef DISABLE_EVENT
1199 event_defer_errno
= addr
->more_errno
;
1200 msg_event_raise(US
"msg:rcpt:host:defer", addr
);
1203 /* Log temporary errors if there are more hosts to be tried.
1204 If not, log this last one in the == line. */
1206 if (sx
->conn_args
.host
->next
)
1207 if (LOGGING(outgoing_port
))
1208 log_write(0, LOG_MAIN
, "H=%s [%s]:%d %s", sx
->conn_args
.host
->name
,
1209 sx
->conn_args
.host
->address
,
1210 sx
->port
== PORT_NONE ?
25 : sx
->port
, addr
->message
);
1212 log_write(0, LOG_MAIN
, "H=%s [%s]: %s", sx
->conn_args
.host
->name
,
1213 sx
->conn_args
.host
->address
, addr
->message
);
1215 #ifndef DISABLE_EVENT
1217 msg_event_raise(US
"msg:rcpt:defer", addr
);
1220 /* Do not put this message on the list of those waiting for specific
1221 hosts, as otherwise it is likely to be tried too often. */
1223 update_waiting
= FALSE
;
1225 /* Add a retry item for the address so that it doesn't get tried again
1226 too soon. If address_retry_include_sender is true, add the sender address
1227 to the retry key. */
1229 retry_add_item(addr
,
1230 ob
->address_retry_include_sender
1231 ?
string_sprintf("%s:<%s>", addr
->address_retry_key
, sender_address
)
1232 : addr
->address_retry_key
,
1237 } /* Loop for next RCPT response */
1239 /* Update where to start at for the next block of responses, unless we
1240 have already handled all the addresses. */
1242 if (addr
) sx
->sync_addr
= addr
->next
;
1244 /* Handle a response to DATA. If we have not had any good recipients, either
1245 previously or in this block, the response is ignored. */
1247 if (pending_DATA
!= 0)
1249 DEBUG(D_transport
) debug_printf("%s expect data\n", __FUNCTION__
);
1250 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
1251 '3', ob
->command_timeout
))
1256 if (pending_DATA
> 0 || (yield
& 1) != 0)
1258 if (errno
== 0 && sx
->buffer
[0] == '4')
1260 errno
= ERRNO_DATA4XX
;
1261 sx
->first_addr
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
1265 (void)check_response(sx
->conn_args
.host
, &errno
, 0, sx
->buffer
, &code
, &msg
, &pass_message
);
1266 DEBUG(D_transport
) debug_printf("%s\nerror for DATA ignored: pipelining "
1267 "is in use and there were no good recipients\n", msg
);
1271 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1272 present) received 3xx. If any RCPTs were handled and yielded anything other
1273 than 4xx, yield will be set non-zero. */
1282 /* Try an authenticator's client entry */
1285 try_authenticator(smtp_context
* sx
, auth_instance
* au
)
1287 smtp_transport_options_block
* ob
= sx
->conn_args
.ob
; /* transport options */
1288 host_item
* host
= sx
->conn_args
.host
; /* host to deliver to */
1291 sx
->outblock
.authenticating
= TRUE
;
1292 rc
= (au
->info
->clientcode
)(au
, sx
, ob
->command_timeout
,
1293 sx
->buffer
, sizeof(sx
->buffer
));
1294 sx
->outblock
.authenticating
= FALSE
;
1295 DEBUG(D_transport
) debug_printf("%s authenticator yielded %d\n", au
->name
, rc
);
1297 /* A temporary authentication failure must hold up delivery to
1298 this host. After a permanent authentication failure, we carry on
1299 to try other authentication methods. If all fail hard, try to
1300 deliver the message unauthenticated unless require_auth was set. */
1305 f
.smtp_authenticated
= TRUE
; /* stops the outer loop */
1306 client_authenticator
= au
->name
;
1307 if (au
->set_client_id
)
1308 client_authenticated_id
= expand_string(au
->set_client_id
);
1311 /* Failure after writing a command */
1316 /* Failure after reading a response */
1319 if (errno
!= 0 || sx
->buffer
[0] != '5') return FAIL
;
1320 log_write(0, LOG_MAIN
, "%s authenticator failed H=%s [%s] %s",
1321 au
->name
, host
->name
, host
->address
, sx
->buffer
);
1324 /* Failure by some other means. In effect, the authenticator
1325 decided it wasn't prepared to handle this case. Typically this
1326 is the result of "fail" in an expansion string. Do we need to
1327 log anything here? Feb 2006: a message is now put in the buffer
1328 if logging is required. */
1331 if (*sx
->buffer
!= 0)
1332 log_write(0, LOG_MAIN
, "%s authenticator cancelled "
1333 "authentication H=%s [%s] %s", au
->name
, host
->name
,
1334 host
->address
, sx
->buffer
);
1337 /* Internal problem, message in buffer. */
1340 set_errno_nohost(sx
->addrlist
, ERRNO_AUTHPROB
, string_copy(sx
->buffer
),
1350 /* Do the client side of smtp-level authentication.
1353 sx smtp connection context
1355 sx->buffer should have the EHLO response from server (gets overwritten)
1358 OK Success, or failed (but not required): global "smtp_authenticated" set
1359 DEFER Failed authentication (and was required)
1360 ERROR Internal problem
1362 FAIL_SEND Failed communications - transmit
1367 smtp_auth(smtp_context
* sx
)
1369 host_item
* host
= sx
->conn_args
.host
; /* host to deliver to */
1370 smtp_transport_options_block
* ob
= sx
->conn_args
.ob
; /* transport options */
1371 int require_auth
= verify_check_given_host(CUSS
&ob
->hosts_require_auth
, host
);
1372 #ifdef EXPERIMENTAL_PIPE_CONNECT
1373 unsigned short authbits
= tls_out
.active
.sock
>= 0
1374 ? sx
->ehlo_resp
.crypted_auths
: sx
->ehlo_resp
.cleartext_auths
;
1376 uschar
* fail_reason
= US
"server did not advertise AUTH support";
1378 f
.smtp_authenticated
= FALSE
;
1379 client_authenticator
= client_authenticated_id
= client_authenticated_sender
= NULL
;
1382 regex_AUTH
= regex_must_compile(AUTHS_REGEX
, FALSE
, TRUE
);
1384 /* Is the server offering AUTH? */
1388 #ifdef EXPERIMENTAL_PIPE_CONNECT
1389 sx
->early_pipe_active ? authbits
1392 regex_match_and_setup(regex_AUTH
, sx
->buffer
, 0, -1)
1395 uschar
* names
= NULL
;
1396 expand_nmax
= -1; /* reset */
1398 #ifdef EXPERIMENTAL_PIPE_CONNECT
1399 if (!sx
->early_pipe_active
)
1401 names
= string_copyn(expand_nstring
[1], expand_nlength
[1]);
1403 /* Must not do this check until after we have saved the result of the
1404 regex match above as the check could be another RE. */
1406 if ( require_auth
== OK
1407 || verify_check_given_host(CUSS
&ob
->hosts_try_auth
, host
) == OK
)
1411 DEBUG(D_transport
) debug_printf("scanning authentication mechanisms\n");
1412 fail_reason
= US
"no common mechanisms were found";
1414 #ifdef EXPERIMENTAL_PIPE_CONNECT
1415 if (sx
->early_pipe_active
)
1417 /* Scan our authenticators (which support use by a client and were offered
1418 by the server (checked at cache-write time)), not suppressed by
1419 client_condition. If one is found, attempt to authenticate by calling its
1420 client function. We are limited to supporting up to 16 authenticator
1421 public-names by the number of bits in a short. */
1426 for (bitnum
= 0, au
= auths
;
1427 !f
.smtp_authenticated
&& au
&& bitnum
< 16;
1428 bitnum
++, au
= au
->next
) if (authbits
& BIT(bitnum
))
1430 if ( au
->client_condition
1431 && !expand_check_condition(au
->client_condition
, au
->name
,
1432 US
"client authenticator"))
1434 DEBUG(D_transport
) debug_printf("skipping %s authenticator: %s\n",
1435 au
->name
, "client_condition is false");
1439 /* Found data for a listed mechanism. Call its client entry. Set
1440 a flag in the outblock so that data is overwritten after sending so
1441 that reflections don't show it. */
1443 fail_reason
= US
"authentication attempt(s) failed";
1445 if ((rc
= try_authenticator(sx
, au
)) != OK
)
1452 /* Scan the configured authenticators looking for one which is configured
1453 for use as a client, which is not suppressed by client_condition, and
1454 whose name matches an authentication mechanism supported by the server.
1455 If one is found, attempt to authenticate by calling its client function.
1458 for (au
= auths
; !f
.smtp_authenticated
&& au
; au
= au
->next
)
1463 || ( au
->client_condition
1464 && !expand_check_condition(au
->client_condition
, au
->name
,
1465 US
"client authenticator")))
1467 DEBUG(D_transport
) debug_printf("skipping %s authenticator: %s\n",
1469 (au
->client
)?
"client_condition is false" :
1470 "not configured as a client");
1474 /* Loop to scan supported server mechanisms */
1478 int len
= Ustrlen(au
->public_name
);
1481 while (isspace(*p
)) p
++;
1483 if (strncmpic(au
->public_name
, p
, len
) != 0 ||
1484 (p
[len
] != 0 && !isspace(p
[len
])))
1486 while (*p
!= 0 && !isspace(*p
)) p
++;
1490 /* Found data for a listed mechanism. Call its client entry. Set
1491 a flag in the outblock so that data is overwritten after sending so
1492 that reflections don't show it. */
1494 fail_reason
= US
"authentication attempt(s) failed";
1496 if ((rc
= try_authenticator(sx
, au
)) != OK
)
1499 break; /* If not authenticated, try next authenticator */
1500 } /* Loop for scanning supported server mechanisms */
1501 } /* Loop for further authenticators */
1505 /* If we haven't authenticated, but are required to, give up. */
1507 if (require_auth
== OK
&& !f
.smtp_authenticated
)
1509 set_errno_nohost(sx
->addrlist
, ERRNO_AUTHFAIL
,
1510 string_sprintf("authentication required but %s", fail_reason
), DEFER
,
1519 /* Construct AUTH appendix string for MAIL TO */
1522 buffer to build string
1523 addrlist chain of potential addresses to deliver
1524 ob transport options
1526 Globals f.smtp_authenticated
1527 client_authenticated_sender
1528 Return True on error, otherwise buffer has (possibly empty) terminated string
1532 smtp_mail_auth_str(uschar
*buffer
, unsigned bufsize
, address_item
*addrlist
,
1533 smtp_transport_options_block
*ob
)
1535 uschar
*local_authenticated_sender
= authenticated_sender
;
1538 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender
, ob
->authenticated_sender
, f
.smtp_authenticated?
"Y":"N");
1541 if (ob
->authenticated_sender
!= NULL
)
1543 uschar
*new = expand_string(ob
->authenticated_sender
);
1546 if (!f
.expand_string_forcedfail
)
1548 uschar
*message
= string_sprintf("failed to expand "
1549 "authenticated_sender: %s", expand_string_message
);
1550 set_errno_nohost(addrlist
, ERRNO_EXPANDFAIL
, message
, DEFER
, FALSE
);
1554 else if (new[0] != 0) local_authenticated_sender
= new;
1557 /* Add the authenticated sender address if present */
1559 if ((f
.smtp_authenticated
|| ob
->authenticated_sender_force
) &&
1560 local_authenticated_sender
!= NULL
)
1562 string_format(buffer
, bufsize
, " AUTH=%s",
1563 auth_xtextencode(local_authenticated_sender
,
1564 Ustrlen(local_authenticated_sender
)));
1565 client_authenticated_sender
= string_copy(local_authenticated_sender
);
1576 /* Lookup TLSA record for host/port.
1577 Return: OK success with dnssec; DANE mode
1578 DEFER Do not use this host now, may retry later
1579 FAIL_FORCED No TLSA record; DANE not usable
1580 FAIL Do not use this connection
1584 tlsa_lookup(const host_item
* host
, dns_answer
* dnsa
, BOOL dane_required
)
1586 /* move this out to host.c given the similarity to dns_lookup() ? */
1588 const uschar
* fullname
= buffer
;
1592 /* TLSA lookup string */
1593 (void)sprintf(CS buffer
, "_%d._tcp.%.256s", host
->port
, host
->name
);
1595 rc
= dns_lookup(dnsa
, buffer
, T_TLSA
, &fullname
);
1596 sec
= dns_is_secure(dnsa
);
1598 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc
, sec ?
"" : "not ");
1603 return DEFER
; /* just defer this TLS'd conn */
1612 for (rr
= dns_next_rr(dnsa
, &dnss
, RESET_ANSWERS
); rr
;
1613 rr
= dns_next_rr(dnsa
, &dnss
, RESET_NEXT
))
1614 if (rr
->type
== T_TLSA
&& rr
->size
> 3)
1616 uint16_t payload_length
= rr
->size
- 3;
1617 uschar s
[MAX_TLSA_EXPANDED_SIZE
], * sp
= s
, * p
= US rr
->data
;
1619 sp
+= sprintf(CS sp
, "%d ", *p
++); /* usage */
1620 sp
+= sprintf(CS sp
, "%d ", *p
++); /* selector */
1621 sp
+= sprintf(CS sp
, "%d ", *p
++); /* matchtype */
1622 while (payload_length
-- > 0 && sp
-s
< (MAX_TLSA_EXPANDED_SIZE
- 4))
1623 sp
+= sprintf(CS sp
, "%02x", *p
++);
1625 debug_printf(" %s\n", s
);
1630 log_write(0, LOG_MAIN
,
1631 "DANE error: TLSA lookup for %s not DNSSEC", host
->name
);
1634 case DNS_NODATA
: /* no TLSA RR for this lookup */
1635 case DNS_NOMATCH
: /* no records at all for this lookup */
1636 return dane_required ? FAIL
: FAIL_FORCED
;
1640 return dane_required ? FAIL
: DEFER
;
1647 typedef struct smtp_compare_s
1649 uschar
*current_sender_address
;
1650 struct transport_instance
*tblock
;
1654 /* Create a unique string that identifies this message, it is based on
1655 sender_address, helo_data and tls_certificate if enabled.
1659 smtp_local_identity(uschar
* sender
, struct transport_instance
* tblock
)
1661 address_item
* addr1
;
1662 uschar
* if1
= US
"";
1663 uschar
* helo1
= US
"";
1665 uschar
* tlsc1
= US
"";
1667 uschar
* save_sender_address
= sender_address
;
1668 uschar
* local_identity
= NULL
;
1669 smtp_transport_options_block
* ob
= SOB tblock
->options_block
;
1671 sender_address
= sender
;
1673 addr1
= deliver_make_addr (sender
, TRUE
);
1674 deliver_set_expansions(addr1
);
1677 if1
= expand_string(ob
->interface
);
1680 helo1
= expand_string(ob
->helo_data
);
1683 if (ob
->tls_certificate
)
1684 tlsc1
= expand_string(ob
->tls_certificate
);
1685 local_identity
= string_sprintf ("%s^%s^%s", if1
, helo1
, tlsc1
);
1687 local_identity
= string_sprintf ("%s^%s", if1
, helo1
);
1690 deliver_set_expansions(NULL
);
1691 sender_address
= save_sender_address
;
1693 return local_identity
;
1698 /* This routine is a callback that is called from transport_check_waiting.
1699 This function will evaluate the incoming message versus the previous
1700 message. If the incoming message is using a different local identity then
1701 we will veto this new message. */
1704 smtp_are_same_identities(uschar
* message_id
, smtp_compare_t
* s_compare
)
1706 uschar
* message_local_identity
,
1707 * current_local_identity
,
1708 * new_sender_address
;
1710 current_local_identity
=
1711 smtp_local_identity(s_compare
->current_sender_address
, s_compare
->tblock
);
1713 if (!(new_sender_address
= deliver_get_sender_address(message_id
)))
1716 message_local_identity
=
1717 smtp_local_identity(new_sender_address
, s_compare
->tblock
);
1719 return Ustrcmp(current_local_identity
, message_local_identity
) == 0;
1725 ehlo_response(uschar
* buf
, unsigned checks
)
1727 size_t bsize
= Ustrlen(buf
);
1729 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1732 # ifdef EXPERIMENTAL_REQUIRETLS
1733 if ( checks
& OPTION_REQUIRETLS
1734 && pcre_exec(regex_REQUIRETLS
, NULL
, CS buf
,bsize
, 0, PCRE_EOPT
, NULL
,0) < 0)
1736 checks
&= ~OPTION_REQUIRETLS
;
1738 if ( checks
& OPTION_TLS
1739 && pcre_exec(regex_STARTTLS
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1741 checks
&= ~OPTION_TLS
;
1743 if ( checks
& OPTION_IGNQ
1744 && pcre_exec(regex_IGNOREQUOTA
, NULL
, CS buf
, bsize
, 0,
1745 PCRE_EOPT
, NULL
, 0) < 0)
1746 checks
&= ~OPTION_IGNQ
;
1748 if ( checks
& OPTION_CHUNKING
1749 && pcre_exec(regex_CHUNKING
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1750 checks
&= ~OPTION_CHUNKING
;
1752 #ifndef DISABLE_PRDR
1753 if ( checks
& OPTION_PRDR
1754 && pcre_exec(regex_PRDR
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1756 checks
&= ~OPTION_PRDR
;
1759 if ( checks
& OPTION_UTF8
1760 && pcre_exec(regex_UTF8
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1762 checks
&= ~OPTION_UTF8
;
1764 if ( checks
& OPTION_DSN
1765 && pcre_exec(regex_DSN
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1766 checks
&= ~OPTION_DSN
;
1768 if ( checks
& OPTION_PIPE
1769 && pcre_exec(regex_PIPELINING
, NULL
, CS buf
, bsize
, 0,
1770 PCRE_EOPT
, NULL
, 0) < 0)
1771 checks
&= ~OPTION_PIPE
;
1773 if ( checks
& OPTION_SIZE
1774 && pcre_exec(regex_SIZE
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1775 checks
&= ~OPTION_SIZE
;
1777 #ifdef EXPERIMENTAL_PIPE_CONNECT
1778 if ( checks
& OPTION_EARLY_PIPE
1779 && pcre_exec(regex_EARLY_PIPE
, NULL
, CS buf
, bsize
, 0,
1780 PCRE_EOPT
, NULL
, 0) < 0)
1782 checks
&= ~OPTION_EARLY_PIPE
;
1784 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1790 /* Callback for emitting a BDAT data chunk header.
1792 If given a nonzero size, first flush any buffered SMTP commands
1793 then emit the command.
1795 Reap previous SMTP command responses if requested, and always reap
1796 the response from a previous BDAT command.
1799 tctx transport context
1800 chunk_size value for SMTP BDAT command
1802 tc_chunk_last add LAST option to SMTP BDAT command
1803 tc_reap_prev reap response to previous SMTP commands
1805 Returns: OK or ERROR
1809 smtp_chunk_cmd_callback(transport_ctx
* tctx
, unsigned chunk_size
,
1812 smtp_transport_options_block
* ob
= SOB tctx
->tblock
->options_block
;
1813 smtp_context
* sx
= tctx
->smtp_context
;
1817 /* Write SMTP chunk header command. If not reaping responses, note that
1818 there may be more writes (like, the chunk data) done soon. */
1822 #ifdef EXPERIMENTAL_PIPE_CONNECT
1823 BOOL new_conn
= !!(sx
->outblock
.conn_args
);
1825 if((cmd_count
= smtp_write_command(sx
,
1826 flags
& tc_reap_prev ? SCMD_FLUSH
: SCMD_MORE
,
1827 "BDAT %u%s\r\n", chunk_size
, flags
& tc_chunk_last ?
" LAST" : "")
1828 ) < 0) return ERROR
;
1829 if (flags
& tc_chunk_last
)
1830 data_command
= string_copy(big_buffer
); /* Save for later error message */
1831 #ifdef EXPERIMENTAL_PIPE_CONNECT
1832 /* That command write could have been the one that made the connection.
1833 Copy the fd from the client conn ctx (smtp transport specific) to the
1834 generic transport ctx. */
1837 tctx
->u
.fd
= sx
->outblock
.cctx
->sock
;
1841 prev_cmd_count
= cmd_count
+= sx
->cmd_count
;
1843 /* Reap responses for any previous, but not one we just emitted */
1847 if (sx
->pending_BDAT
)
1850 if (flags
& tc_reap_prev
&& prev_cmd_count
> 0)
1852 DEBUG(D_transport
) debug_printf("look for %d responses"
1853 " for previous pipelined cmds\n", prev_cmd_count
);
1855 switch(sync_responses(sx
, prev_cmd_count
, 0))
1857 case 1: /* 2xx (only) => OK */
1858 case 3: sx
->good_RCPT
= TRUE
; /* 2xx & 5xx => OK & progress made */
1859 case 2: sx
->completed_addr
= TRUE
; /* 5xx (only) => progress made */
1860 case 0: break; /* No 2xx or 5xx, but no probs */
1862 case -1: /* Timeout on RCPT */
1863 #ifdef EXPERIMENTAL_PIPE_CONNECT
1864 case -4: /* non-2xx for pipelined banner or EHLO */
1866 default: return ERROR
; /* I/O error, or any MAIL/DATA error */
1869 if (!sx
->pending_BDAT
)
1870 pipelining_active
= FALSE
;
1873 /* Reap response for an outstanding BDAT */
1875 if (sx
->pending_BDAT
)
1877 DEBUG(D_transport
) debug_printf("look for one response for BDAT\n");
1879 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
1880 ob
->command_timeout
))
1882 if (errno
== 0 && sx
->buffer
[0] == '4')
1884 errno
= ERRNO_DATA4XX
; /*XXX does this actually get used? */
1885 sx
->addrlist
->more_errno
|=
1886 ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
1891 sx
->pending_BDAT
= FALSE
;
1892 pipelining_active
= FALSE
;
1894 else if (chunk_size
> 0)
1895 sx
->pending_BDAT
= TRUE
;
1898 sx
->cmd_count
= cmd_count
;
1906 /*************************************************
1907 * Make connection for given message *
1908 *************************************************/
1912 ctx connection context
1913 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1914 a second attempt after TLS initialization fails
1916 Returns: OK - the connection was made and the delivery attempted;
1917 fd is set in the conn context, tls_out set up.
1918 DEFER - the connection could not be made, or something failed
1919 while setting up the SMTP session, or there was a
1920 non-message-specific error, such as a timeout.
1921 ERROR - helo_data or add_headers or authenticated_sender is
1922 specified for this transport, and the string failed
1926 smtp_setup_conn(smtp_context
* sx
, BOOL suppress_tls
)
1928 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1929 dns_answer tlsa_dnsa
;
1931 smtp_transport_options_block
* ob
= sx
->conn_args
.tblock
->options_block
;
1932 BOOL pass_message
= FALSE
;
1933 uschar
* message
= NULL
;
1937 sx
->conn_args
.ob
= ob
;
1939 sx
->lmtp
= strcmpic(ob
->protocol
, US
"lmtp") == 0;
1940 sx
->smtps
= strcmpic(ob
->protocol
, US
"smtps") == 0;
1942 sx
->send_rset
= TRUE
;
1943 sx
->send_quit
= TRUE
;
1944 sx
->setting_up
= TRUE
;
1946 sx
->esmtp_sent
= FALSE
;
1948 sx
->utf8_needed
= FALSE
;
1950 sx
->dsn_all_lasthop
= TRUE
;
1951 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1954 verify_check_given_host(CUSS
&ob
->hosts_require_dane
, sx
->conn_args
.host
) == OK
;
1956 #ifdef EXPERIMENTAL_PIPE_CONNECT
1957 sx
->early_pipe_active
= sx
->early_pipe_ok
= FALSE
;
1958 sx
->ehlo_resp
.cleartext_features
= sx
->ehlo_resp
.crypted_features
= 0;
1959 sx
->pending_BANNER
= sx
->pending_EHLO
= FALSE
;
1962 if ((sx
->max_rcpt
= sx
->conn_args
.tblock
->max_addresses
) == 0) sx
->max_rcpt
= 999999;
1963 sx
->peer_offered
= 0;
1964 sx
->avoid_option
= 0;
1965 sx
->igquotstr
= US
"";
1966 if (!sx
->helo_data
) sx
->helo_data
= ob
->helo_data
;
1967 #ifdef EXPERIMENTAL_DSN_INFO
1968 sx
->smtp_greeting
= NULL
;
1969 sx
->helo_response
= NULL
;
1972 smtp_command
= US
"initial connection";
1973 sx
->buffer
[0] = '\0';
1975 /* Set up the buffer for reading SMTP response packets. */
1977 sx
->inblock
.buffer
= sx
->inbuffer
;
1978 sx
->inblock
.buffersize
= sizeof(sx
->inbuffer
);
1979 sx
->inblock
.ptr
= sx
->inbuffer
;
1980 sx
->inblock
.ptrend
= sx
->inbuffer
;
1982 /* Set up the buffer for holding SMTP commands while pipelining */
1984 sx
->outblock
.buffer
= sx
->outbuffer
;
1985 sx
->outblock
.buffersize
= sizeof(sx
->outbuffer
);
1986 sx
->outblock
.ptr
= sx
->outbuffer
;
1987 sx
->outblock
.cmd_count
= 0;
1988 sx
->outblock
.authenticating
= FALSE
;
1989 sx
->outblock
.conn_args
= NULL
;
1991 /* Reset the parameters of a TLS session. */
1994 tls_out
.cipher
= NULL
; /* the one we may use for this transport */
1995 tls_out
.ourcert
= NULL
;
1996 tls_out
.peercert
= NULL
;
1997 tls_out
.peerdn
= NULL
;
1998 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
2001 tls_out
.ocsp
= OCSP_NOT_REQ
;
2003 /* Flip the legacy TLS-related variables over to the outbound set in case
2004 they're used in the context of the transport. Don't bother resetting
2005 afterward (when being used by a transport) as we're in a subprocess.
2006 For verify, unflipped once the callout is dealt with */
2008 tls_modify_variables(&tls_out
);
2013 set_errno_nohost(sx
->addrlist
, ERRNO_TLSFAILURE
, US
"TLS support not available",
2019 /* Make a connection to the host if this isn't a continued delivery, and handle
2020 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2021 specially so they can be identified for retries. */
2023 if (!continue_hostname
)
2026 HDEBUG(D_verify
) debug_printf("interface=%s port=%d\n", sx
->conn_args
.interface
, sx
->port
);
2028 /* Get the actual port the connection will use, into sx->conn_args.host */
2030 smtp_port_for_connect(sx
->conn_args
.host
, sx
->port
);
2032 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
2033 /* Do TLSA lookup for DANE */
2035 tls_out
.dane_verified
= FALSE
;
2036 tls_out
.tlsa_usage
= 0;
2038 if (sx
->conn_args
.host
->dnssec
== DS_YES
)
2040 if( sx
->dane_required
2041 || verify_check_given_host(CUSS
&ob
->hosts_try_dane
, sx
->conn_args
.host
) == OK
2043 switch (rc
= tlsa_lookup(sx
->conn_args
.host
, &tlsa_dnsa
, sx
->dane_required
))
2045 case OK
: sx
->dane
= TRUE
;
2046 ob
->tls_tempfail_tryclear
= FALSE
;
2048 case FAIL_FORCED
: break;
2049 default: set_errno_nohost(sx
->addrlist
, ERRNO_DNSDEFER
,
2050 string_sprintf("DANE error: tlsa lookup %s",
2051 rc
== DEFER ?
"DEFER" : "FAIL"),
2053 # ifndef DISABLE_EVENT
2054 (void) event_raise(sx
->conn_args
.tblock
->event_action
,
2055 US
"dane:fail", sx
->dane_required
2056 ? US
"dane-required" : US
"dnssec-invalid");
2061 else if (sx
->dane_required
)
2063 set_errno_nohost(sx
->addrlist
, ERRNO_DNSDEFER
,
2064 string_sprintf("DANE error: %s lookup not DNSSEC", sx
->conn_args
.host
->name
),
2066 # ifndef DISABLE_EVENT
2067 (void) event_raise(sx
->conn_args
.tblock
->event_action
,
2068 US
"dane:fail", US
"dane-required");
2075 /* Make the TCP connection */
2077 sx
->cctx
.tls_ctx
= NULL
;
2078 sx
->inblock
.cctx
= sx
->outblock
.cctx
= &sx
->cctx
;
2079 sx
->avoid_option
= sx
->peer_offered
= smtp_peer_options
= 0;
2081 #ifdef EXPERIMENTAL_PIPE_CONNECT
2082 if (verify_check_given_host(CUSS
&ob
->hosts_pipe_connect
, sx
->conn_args
.host
) == OK
)
2084 sx
->early_pipe_ok
= TRUE
;
2085 if ( read_ehlo_cache_entry(sx
)
2086 && sx
->ehlo_resp
.cleartext_features
& OPTION_EARLY_PIPE
)
2088 DEBUG(D_transport
) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2089 sx
->early_pipe_active
= TRUE
;
2090 sx
->peer_offered
= sx
->ehlo_resp
.cleartext_features
;
2094 if (sx
->early_pipe_active
)
2095 sx
->outblock
.conn_args
= &sx
->conn_args
;
2099 if ((sx
->cctx
.sock
= smtp_connect(&sx
->conn_args
, NULL
)) < 0)
2101 uschar
* msg
= NULL
;
2104 msg
= US
strerror(errno
);
2105 HDEBUG(D_verify
) debug_printf("connect: %s\n", msg
);
2107 set_errno_nohost(sx
->addrlist
,
2108 errno
== ETIMEDOUT ? ERRNO_CONNECTTIMEOUT
: errno
,
2109 sx
->verify ?
string_sprintf("could not connect: %s", msg
)
2112 sx
->send_quit
= FALSE
;
2116 /* Expand the greeting message while waiting for the initial response. (Makes
2117 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2118 delayed till here so that $sending_interface and $sending_port are set. */
2119 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2120 will be? Somehow I doubt it. */
2123 if (!(sx
->helo_data
= expand_string(sx
->helo_data
)))
2125 log_write(0, LOG_MAIN
|LOG_PANIC
,
2126 "<%s>: failed to expand transport's helo_data value for callout: %s",
2127 sx
->addrlist
->address
, expand_string_message
);
2132 expand_string_message
= NULL
;
2133 if ((sx
->helo_data
= string_domain_utf8_to_alabel(sx
->helo_data
,
2134 &expand_string_message
)),
2135 expand_string_message
)
2137 log_write(0, LOG_MAIN
|LOG_PANIC
,
2138 "<%s>: failed to expand transport's helo_data value for callout: %s",
2139 sx
->addrlist
->address
, expand_string_message
);
2141 sx
->helo_data
= NULL
;
2145 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2146 is nevertheless a reasonably clean way of programming this kind of logic,
2147 where you want to escape on any error. */
2151 #ifdef EXPERIMENTAL_PIPE_CONNECT
2152 if (sx
->early_pipe_active
)
2154 sx
->pending_BANNER
= TRUE
; /* sync_responses() must eventually handle */
2155 sx
->outblock
.cmd_count
= 1;
2161 (void) setsockopt(sx
->cctx
.sock
, IPPROTO_TCP
, TCP_QUICKACK
, US
&off
,
2164 if (!smtp_reap_banner(sx
))
2165 goto RESPONSE_FAILED
;
2168 #ifndef DISABLE_EVENT
2171 lookup_dnssec_authenticated
= sx
->conn_args
.host
->dnssec
==DS_YES ? US
"yes"
2172 : sx
->conn_args
.host
->dnssec
==DS_NO ? US
"no" : NULL
;
2173 s
= event_raise(sx
->conn_args
.tblock
->event_action
, US
"smtp:connect", sx
->buffer
);
2176 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
,
2177 string_sprintf("deferred by smtp:connect event expansion: %s", s
),
2185 /* Now check if the helo_data expansion went well, and sign off cleanly if
2190 message
= string_sprintf("failed to expand helo_data: %s",
2191 expand_string_message
);
2192 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
, message
, DEFER
, FALSE
);
2198 /** Debugging without sending a message
2199 sx->addrlist->transport_return = DEFER;
2203 /* Errors that occur after this point follow an SMTP command, which is
2204 left in big_buffer by smtp_write_command() for use in error messages. */
2206 smtp_command
= big_buffer
;
2208 /* Tell the remote who we are...
2210 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2211 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2212 greeting is of this form. The assumption was that the far end supports it
2213 properly... but experience shows that there are some that give 5xx responses,
2214 even though the banner includes "ESMTP" (there's a bloody-minded one that
2215 says "ESMTP not spoken here"). Cope with that case.
2217 September 2000: Time has passed, and it seems reasonable now to always send
2218 EHLO at the start. It is also convenient to make the change while installing
2221 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2222 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2223 would be no way to send out the mails, so there is now a host list
2224 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2225 PIPELINING problem as well. Maybe it can also be useful to cure other
2226 problems with broken servers.
2228 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2229 Then somebody tried it with a Microsoft mailer... It seems that all other
2230 mailers use upper case for some reason (the RFC is quite clear about case
2231 independence) so, for peace of mind, I gave in. */
2233 sx
->esmtp
= verify_check_given_host(CUSS
&ob
->hosts_avoid_esmtp
, sx
->conn_args
.host
) != OK
;
2235 /* Alas; be careful, since this goto is not an error-out, so conceivably
2236 we might set data between here and the target which we assume to exist
2237 and be usable. I can see this coming back to bite us. */
2241 smtp_peer_options
|= OPTION_TLS
;
2242 suppress_tls
= FALSE
;
2243 ob
->tls_tempfail_tryclear
= FALSE
;
2244 smtp_command
= US
"SSL-on-connect";
2251 if (smtp_write_command(sx
,
2252 #ifdef EXPERIMENTAL_PIPE_CONNECT
2253 sx
->early_pipe_active ? SCMD_BUFFER
:
2256 "%s %s\r\n", sx
->lmtp ?
"LHLO" : "EHLO", sx
->helo_data
) < 0)
2258 sx
->esmtp_sent
= TRUE
;
2260 #ifdef EXPERIMENTAL_PIPE_CONNECT
2261 if (sx
->early_pipe_active
)
2263 sx
->pending_EHLO
= TRUE
;
2265 /* If we have too many authenticators to handle and might need to AUTH
2266 for this transport, pipeline no further as we will need the
2267 list of auth methods offered. Reap the banner and EHLO. */
2269 if ( (ob
->hosts_require_auth
|| ob
->hosts_try_auth
)
2270 && f
.smtp_in_early_pipe_no_auth
)
2272 DEBUG(D_transport
) debug_printf("may need to auth, so pipeline no further\n");
2273 if (smtp_write_command(sx
, SCMD_FLUSH
, NULL
) < 0)
2275 if (sync_responses(sx
, 2, 0) != 0)
2278 debug_printf("failed reaping pipelined cmd responses\n");
2279 goto RESPONSE_FAILED
;
2281 sx
->early_pipe_active
= FALSE
;
2286 if (!smtp_reap_ehlo(sx
))
2287 goto RESPONSE_FAILED
;
2291 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2293 #ifdef EXPERIMENTAL_PIPE_CONNECT
2294 if (!sx
->early_pipe_active
)
2299 int n
= sizeof(sx
->buffer
);
2300 uschar
* rsp
= sx
->buffer
;
2302 if (sx
->esmtp_sent
&& (n
= Ustrlen(sx
->buffer
)) < sizeof(sx
->buffer
)/2)
2303 { rsp
= sx
->buffer
+ n
+ 1; n
= sizeof(sx
->buffer
) - n
; }
2305 if (smtp_write_command(sx
, SCMD_FLUSH
, "HELO %s\r\n", sx
->helo_data
) < 0)
2307 good_response
= smtp_read_response(sx
, rsp
, n
, '2', ob
->command_timeout
);
2308 #ifdef EXPERIMENTAL_DSN_INFO
2309 sx
->helo_response
= string_copy(rsp
);
2313 /* Handle special logging for a closed connection after HELO
2314 when had previously sent EHLO */
2316 if (rsp
!= sx
->buffer
&& rsp
[0] == 0 && (errno
== 0 || errno
== ECONNRESET
))
2318 errno
= ERRNO_SMTPCLOSED
;
2319 goto EHLOHELO_FAILED
;
2321 memmove(sx
->buffer
, rsp
, Ustrlen(rsp
));
2322 goto RESPONSE_FAILED
;
2326 if (sx
->esmtp
|| sx
->lmtp
)
2328 #ifdef EXPERIMENTAL_PIPE_CONNECT
2329 if (!sx
->early_pipe_active
)
2332 sx
->peer_offered
= ehlo_response(sx
->buffer
,
2333 OPTION_TLS
/* others checked later */
2334 #ifdef EXPERIMENTAL_PIPE_CONNECT
2335 | (sx
->early_pipe_ok
2337 | OPTION_CHUNKING
| OPTION_PRDR
| OPTION_DSN
| OPTION_PIPE
| OPTION_SIZE
2346 #ifdef EXPERIMENTAL_PIPE_CONNECT
2347 if (sx
->early_pipe_ok
)
2349 sx
->ehlo_resp
.cleartext_features
= sx
->peer_offered
;
2351 if ( (sx
->peer_offered
& (OPTION_PIPE
| OPTION_EARLY_PIPE
))
2352 == (OPTION_PIPE
| OPTION_EARLY_PIPE
))
2354 DEBUG(D_transport
) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2355 sx
->ehlo_resp
.cleartext_auths
= study_ehlo_auths(sx
);
2356 write_ehlo_cache_entry(sx
);
2362 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2365 smtp_peer_options
|= sx
->peer_offered
& OPTION_TLS
;
2370 /* For continuing deliveries down the same channel, having re-exec'd the socket
2371 is the standard input; for a socket held open from verify it is recorded
2372 in the cutthrough context block. Either way we don't need to redo EHLO here
2373 (but may need to do so for TLS - see below).
2374 Set up the pointer to where subsequent commands will be left, for
2375 error messages. Note that smtp_peer_options will have been
2376 set from the command line if they were set in the process that passed the
2379 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2380 as the continue goes via transport_pass_socket() and doublefork and exec.
2381 It does not wait. Unclear how we keep separate host's responses
2382 separate - we could match up by host ip+port as a bodge. */
2386 if (cutthrough
.cctx
.sock
>= 0 && cutthrough
.callout_hold_only
)
2388 sx
->cctx
= cutthrough
.cctx
;
2389 sx
->conn_args
.host
->port
= sx
->port
= cutthrough
.host
.port
;
2393 sx
->cctx
.sock
= 0; /* stdin */
2394 sx
->cctx
.tls_ctx
= NULL
;
2395 smtp_port_for_connect(sx
->conn_args
.host
, sx
->port
); /* Record the port that was used */
2397 sx
->inblock
.cctx
= sx
->outblock
.cctx
= &sx
->cctx
;
2398 smtp_command
= big_buffer
;
2399 sx
->helo_data
= NULL
; /* ensure we re-expand ob->helo_data */
2401 /* For a continued connection with TLS being proxied for us, or a
2402 held-open verify connection with TLS, nothing more to do. */
2404 if ( continue_proxy_cipher
2405 || (cutthrough
.cctx
.sock
>= 0 && cutthrough
.callout_hold_only
2406 && cutthrough
.is_tls
)
2409 sx
->peer_offered
= smtp_peer_options
;
2410 sx
->pipelining_used
= pipelining_active
= !!(smtp_peer_options
& OPTION_PIPE
);
2411 HDEBUG(D_transport
) debug_printf("continued connection, %s TLS\n",
2412 continue_proxy_cipher ?
"proxied" : "verify conn with");
2415 HDEBUG(D_transport
) debug_printf("continued connection, no TLS\n");
2418 /* If TLS is available on this connection, whether continued or not, attempt to
2419 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2420 send another EHLO - the server may give a different answer in secure mode. We
2421 use a separate buffer for reading the response to STARTTLS so that if it is
2422 negative, the original EHLO data is available for subsequent analysis, should
2423 the client not be required to use TLS. If the response is bad, copy the buffer
2424 for error analysis. */
2427 if ( smtp_peer_options
& OPTION_TLS
2429 && verify_check_given_host(CUSS
&ob
->hosts_avoid_tls
, sx
->conn_args
.host
) != OK
2431 || verify_check_given_host(CUSS
&ob
->hosts_verify_avoid_tls
, sx
->conn_args
.host
) != OK
2434 uschar buffer2
[4096];
2436 if (smtp_write_command(sx
, SCMD_FLUSH
, "STARTTLS\r\n") < 0)
2439 #ifdef EXPERIMENTAL_PIPE_CONNECT
2440 /* If doing early-pipelining reap the banner and EHLO-response but leave
2441 the response for the STARTTLS we just sent alone. */
2443 if (sx
->early_pipe_active
&& sync_responses(sx
, 2, 0) != 0)
2446 debug_printf("failed reaping pipelined cmd responses\n");
2447 goto RESPONSE_FAILED
;
2451 /* If there is an I/O error, transmission of this message is deferred. If
2452 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2453 false, we also defer. However, if there is a temporary rejection of STARTTLS
2454 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2455 STARTTLS, we carry on. This means we will try to send the message in clear,
2456 unless the host is in hosts_require_tls (tested below). */
2458 if (!smtp_read_response(sx
, buffer2
, sizeof(buffer2
), '2', ob
->command_timeout
))
2462 || (buffer2
[0] == '4' && !ob
->tls_tempfail_tryclear
)
2465 Ustrncpy(sx
->buffer
, buffer2
, sizeof(sx
->buffer
));
2466 sx
->buffer
[sizeof(sx
->buffer
)-1] = '\0';
2467 goto RESPONSE_FAILED
;
2471 /* STARTTLS accepted: try to negotiate a TLS session. */
2476 address_item
* addr
;
2478 sx
->cctx
.tls_ctx
= tls_client_start(sx
->cctx
.sock
, sx
->conn_args
.host
,
2479 sx
->addrlist
, sx
->conn_args
.tblock
,
2480 # ifdef SUPPORT_DANE
2481 sx
->dane ?
&tlsa_dnsa
: NULL
,
2485 if (!sx
->cctx
.tls_ctx
)
2487 /* TLS negotiation failed; give an error. From outside, this function may
2488 be called again to try in clear on a new connection, if the options permit
2489 it for this host. */
2490 DEBUG(D_tls
) debug_printf("TLS session fail: %s\n", errstr
);
2492 # ifdef SUPPORT_DANE
2495 log_write(0, LOG_MAIN
,
2496 "DANE attempt failed; TLS connection to %s [%s]: %s",
2497 sx
->conn_args
.host
->name
, sx
->conn_args
.host
->address
, errstr
);
2498 # ifndef DISABLE_EVENT
2499 (void) event_raise(sx
->conn_args
.tblock
->event_action
,
2500 US
"dane:fail", US
"validation-failure"); /* could do with better detail */
2505 errno
= ERRNO_TLSFAILURE
;
2506 message
= string_sprintf("TLS session: %s", errstr
);
2507 sx
->send_quit
= FALSE
;
2511 /* TLS session is set up */
2513 smtp_peer_options_wrap
= smtp_peer_options
;
2514 for (addr
= sx
->addrlist
; addr
; addr
= addr
->next
)
2515 if (addr
->transport_return
== PENDING_DEFER
)
2517 addr
->cipher
= tls_out
.cipher
;
2518 addr
->ourcert
= tls_out
.ourcert
;
2519 addr
->peercert
= tls_out
.peercert
;
2520 addr
->peerdn
= tls_out
.peerdn
;
2521 addr
->ocsp
= tls_out
.ocsp
;
2526 /* if smtps, we'll have smtp_command set to something else; always safe to
2528 smtp_command
= big_buffer
;
2530 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2531 helo_data is null, we are dealing with a connection that was passed from
2532 another process, and so we won't have expanded helo_data above. We have to
2533 expand it here. $sending_ip_address and $sending_port are set up right at the
2534 start of the Exim process (in exim.c). */
2536 if (tls_out
.active
.sock
>= 0)
2538 uschar
* greeting_cmd
;
2540 if (!sx
->helo_data
&& !(sx
->helo_data
= expand_string(ob
->helo_data
)))
2542 uschar
*message
= string_sprintf("failed to expand helo_data: %s",
2543 expand_string_message
);
2544 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
, message
, DEFER
, FALSE
);
2549 #ifdef EXPERIMENTAL_PIPE_CONNECT
2550 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2551 We're unlikely to get the group sent and delivered before the server sends its
2552 banner, but it's still worth sending as a group.
2553 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2556 if (sx
->smtps ? sx
->early_pipe_ok
: sx
->early_pipe_active
)
2558 sx
->peer_offered
= sx
->ehlo_resp
.crypted_features
;
2559 if ((sx
->early_pipe_active
=
2560 !!(sx
->ehlo_resp
.crypted_features
& OPTION_EARLY_PIPE
)))
2561 DEBUG(D_transport
) debug_printf("Using cached crypted PIPE_CONNECT\n");
2565 /* For SMTPS we need to wait for the initial OK response. */
2567 #ifdef EXPERIMENTAL_PIPE_CONNECT
2568 if (sx
->early_pipe_active
)
2570 sx
->pending_BANNER
= TRUE
;
2571 sx
->outblock
.cmd_count
= 1;
2575 if (!smtp_reap_banner(sx
))
2576 goto RESPONSE_FAILED
;
2579 greeting_cmd
= US
"LHLO";
2581 greeting_cmd
= US
"EHLO";
2584 greeting_cmd
= US
"HELO";
2586 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2589 if (smtp_write_command(sx
,
2590 #ifdef EXPERIMENTAL_PIPE_CONNECT
2591 sx
->early_pipe_active ? SCMD_BUFFER
:
2594 "%s %s\r\n", greeting_cmd
, sx
->helo_data
) < 0)
2597 #ifdef EXPERIMENTAL_PIPE_CONNECT
2598 if (sx
->early_pipe_active
)
2599 sx
->pending_EHLO
= TRUE
;
2603 if (!smtp_reap_ehlo(sx
))
2604 goto RESPONSE_FAILED
;
2605 smtp_peer_options
= 0;
2609 /* If the host is required to use a secure channel, ensure that we
2613 # ifdef SUPPORT_DANE
2616 # ifdef EXPERIMENTAL_REQUIRETLS
2617 || tls_requiretls
& REQUIRETLS_MSG
2619 || verify_check_given_host(CUSS
&ob
->hosts_require_tls
, sx
->conn_args
.host
) == OK
2623 # ifdef EXPERIMENTAL_REQUIRETLS
2624 tls_requiretls
& REQUIRETLS_MSG ? ERRNO_REQUIRETLS
:
2627 message
= string_sprintf("a TLS session is required, but %s",
2628 smtp_peer_options
& OPTION_TLS
2629 ?
"an attempt to start TLS failed" : "the server did not offer TLS support");
2630 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2632 (void) event_raise(sx
->conn_args
.tblock
->event_action
, US
"dane:fail",
2633 smtp_peer_options
& OPTION_TLS
2634 ? US
"validation-failure" /* could do with better detail */
2635 : US
"starttls-not-supported");
2639 #endif /*SUPPORT_TLS*/
2641 /* If TLS is active, we have just started it up and re-done the EHLO command,
2642 so its response needs to be analyzed. If TLS is not active and this is a
2643 continued session down a previously-used socket, we haven't just done EHLO, so
2646 if (continue_hostname
== NULL
2648 || tls_out
.active
.sock
>= 0
2652 if (sx
->esmtp
|| sx
->lmtp
)
2654 #ifdef EXPERIMENTAL_PIPE_CONNECT
2655 if (!sx
->early_pipe_active
)
2658 sx
->peer_offered
= ehlo_response(sx
->buffer
,
2660 #ifdef EXPERIMENTAL_PIPE_CONNECT
2661 | (sx
->lmtp
&& ob
->lmtp_ignore_quota ? OPTION_IGNQ
: 0)
2662 | OPTION_DSN
| OPTION_PIPE
| OPTION_SIZE
2663 | OPTION_CHUNKING
| OPTION_PRDR
| OPTION_UTF8
| OPTION_REQUIRETLS
2664 | (tls_out
.active
.sock
>= 0 ? OPTION_EARLY_PIPE
: 0) /* not for lmtp */
2668 | (sx
->lmtp
&& ob
->lmtp_ignore_quota ? OPTION_IGNQ
: 0)
2671 # ifdef SUPPORT_I18N
2672 | (sx
->addrlist
->prop
.utf8_msg ? OPTION_UTF8
: 0)
2673 /*XXX if we hand peercaps on to continued-conn processes,
2674 must not depend on this addr */
2678 | (ob
->size_addition
>= 0 ? OPTION_SIZE
: 0)
2679 # if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2680 | (tls_requiretls
& REQUIRETLS_MSG ? OPTION_REQUIRETLS
: 0)
2684 #ifdef EXPERIMENTAL_PIPE_CONNECT
2685 if (tls_out
.active
.sock
>= 0)
2686 sx
->ehlo_resp
.crypted_features
= sx
->peer_offered
;
2690 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2691 lmtp_ignore_quota option was set. */
2693 sx
->igquotstr
= sx
->peer_offered
& OPTION_IGNQ ? US
" IGNOREQUOTA" : US
"";
2695 /* If the response to EHLO specified support for the SIZE parameter, note
2696 this, provided size_addition is non-negative. */
2698 smtp_peer_options
|= sx
->peer_offered
& OPTION_SIZE
;
2700 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2701 the current host, esmtp will be false, so PIPELINING can never be used. If
2702 the current host matches hosts_avoid_pipelining, don't do it. */
2704 if ( sx
->peer_offered
& OPTION_PIPE
2705 && verify_check_given_host(CUSS
&ob
->hosts_avoid_pipelining
, sx
->conn_args
.host
) != OK
)
2706 smtp_peer_options
|= OPTION_PIPE
;
2708 DEBUG(D_transport
) debug_printf("%susing PIPELINING\n",
2709 smtp_peer_options
& OPTION_PIPE ?
"" : "not ");
2711 if ( sx
->peer_offered
& OPTION_CHUNKING
2712 && verify_check_given_host(CUSS
&ob
->hosts_try_chunking
, sx
->conn_args
.host
) != OK
)
2713 sx
->peer_offered
&= ~OPTION_CHUNKING
;
2715 if (sx
->peer_offered
& OPTION_CHUNKING
)
2716 DEBUG(D_transport
) debug_printf("CHUNKING usable\n");
2718 #ifndef DISABLE_PRDR
2719 if ( sx
->peer_offered
& OPTION_PRDR
2720 && verify_check_given_host(CUSS
&ob
->hosts_try_prdr
, sx
->conn_args
.host
) != OK
)
2721 sx
->peer_offered
&= ~OPTION_PRDR
;
2723 if (sx
->peer_offered
& OPTION_PRDR
)
2724 DEBUG(D_transport
) debug_printf("PRDR usable\n");
2727 /* Note if the server supports DSN */
2728 smtp_peer_options
|= sx
->peer_offered
& OPTION_DSN
;
2729 DEBUG(D_transport
) debug_printf("%susing DSN\n",
2730 sx
->peer_offered
& OPTION_DSN ?
"" : "not ");
2732 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2733 if (sx
->peer_offered
& OPTION_REQUIRETLS
)
2735 smtp_peer_options
|= OPTION_REQUIRETLS
;
2736 DEBUG(D_transport
) debug_printf(
2737 tls_requiretls
& REQUIRETLS_MSG
2738 ?
"using REQUIRETLS\n" : "REQUIRETLS offered\n");
2742 #ifdef EXPERIMENTAL_PIPE_CONNECT
2743 if ( sx
->early_pipe_ok
2744 && !sx
->early_pipe_active
2745 && tls_out
.active
.sock
>= 0
2746 && smtp_peer_options
& OPTION_PIPE
2747 && ( sx
->ehlo_resp
.cleartext_features
| sx
->ehlo_resp
.crypted_features
)
2748 & OPTION_EARLY_PIPE
)
2750 DEBUG(D_transport
) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2751 sx
->ehlo_resp
.crypted_auths
= study_ehlo_auths(sx
);
2752 write_ehlo_cache_entry(sx
);
2756 /* Note if the response to EHLO specifies support for the AUTH extension.
2757 If it has, check that this host is one we want to authenticate to, and do
2758 the business. The host name and address must be available when the
2759 authenticator's client driver is running. */
2761 switch (yield
= smtp_auth(sx
))
2763 default: goto SEND_QUIT
;
2765 case FAIL_SEND
: goto SEND_FAILED
;
2766 case FAIL
: goto RESPONSE_FAILED
;
2770 sx
->pipelining_used
= pipelining_active
= !!(smtp_peer_options
& OPTION_PIPE
);
2772 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2773 message-specific. */
2775 sx
->setting_up
= FALSE
;
2778 if (sx
->addrlist
->prop
.utf8_msg
)
2782 /* If the transport sets a downconversion mode it overrides any set by ACL
2785 if ((s
= ob
->utf8_downconvert
))
2787 if (!(s
= expand_string(s
)))
2789 message
= string_sprintf("failed to expand utf8_downconvert: %s",
2790 expand_string_message
);
2791 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
, message
, DEFER
, FALSE
);
2797 case '1': sx
->addrlist
->prop
.utf8_downcvt
= TRUE
;
2798 sx
->addrlist
->prop
.utf8_downcvt_maybe
= FALSE
;
2800 case '0': sx
->addrlist
->prop
.utf8_downcvt
= FALSE
;
2801 sx
->addrlist
->prop
.utf8_downcvt_maybe
= FALSE
;
2803 case '-': if (s
[1] == '1')
2805 sx
->addrlist
->prop
.utf8_downcvt
= FALSE
;
2806 sx
->addrlist
->prop
.utf8_downcvt_maybe
= TRUE
;
2812 sx
->utf8_needed
= !sx
->addrlist
->prop
.utf8_downcvt
2813 && !sx
->addrlist
->prop
.utf8_downcvt_maybe
;
2814 DEBUG(D_transport
) if (!sx
->utf8_needed
)
2815 debug_printf("utf8: %s downconvert\n",
2816 sx
->addrlist
->prop
.utf8_downcvt ?
"mandatory" : "optional");
2819 /* If this is an international message we need the host to speak SMTPUTF8 */
2820 if (sx
->utf8_needed
&& !(sx
->peer_offered
& OPTION_UTF8
))
2822 errno
= ERRNO_UTF8_FWD
;
2823 goto RESPONSE_FAILED
;
2825 #endif /*SUPPORT_I18N*/
2827 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2828 /*XXX should tls_requiretls actually be per-addr? */
2830 if ( tls_requiretls
& REQUIRETLS_MSG
2831 && !(sx
->peer_offered
& OPTION_REQUIRETLS
)
2834 sx
->setting_up
= TRUE
;
2835 errno
= ERRNO_REQUIRETLS
;
2836 message
= US
"REQUIRETLS support is required from the server"
2837 " but it was not offered";
2838 DEBUG(D_transport
) debug_printf("%s\n", message
);
2851 sx
->send_quit
= check_response(sx
->conn_args
.host
, &errno
, sx
->addrlist
->more_errno
,
2852 sx
->buffer
, &code
, &message
, &pass_message
);
2858 message
= US
string_sprintf("send() to %s [%s] failed: %s",
2859 sx
->conn_args
.host
->name
, sx
->conn_args
.host
->address
, strerror(errno
));
2860 sx
->send_quit
= FALSE
;
2866 message
= string_sprintf("Remote host closed connection in response to %s"
2867 " (EHLO response was: %s)", smtp_command
, sx
->buffer
);
2868 sx
->send_quit
= FALSE
;
2872 /* This label is jumped to directly when a TLS negotiation has failed,
2873 or was not done for a host for which it is required. Values will be set
2874 in message and errno, and setting_up will always be true. Treat as
2875 a temporary error. */
2879 # ifdef EXPERIMENTAL_REQUIRETLS
2880 if (errno
== ERRNO_REQUIRETLS
)
2881 code
= '5', yield
= FAIL
;
2882 /*XXX DSN will be labelled 500; prefer 530 5.7.4 */
2885 code
= '4', yield
= DEFER
;
2889 /* The failure happened while setting up the call; see if the failure was
2890 a 5xx response (this will either be on connection, or following HELO - a 5xx
2891 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2892 fail all addresses, as this host is never going to accept them. For other
2893 errors during setting up (timeouts or whatever), defer all addresses, and
2894 yield DEFER, so that the host is not tried again for a while.
2896 XXX This peeking for another host feels like a layering violation. We want
2897 to note the host as unusable, but down here we shouldn't know if this was
2898 the last host to try for the addr(list). Perhaps the upper layer should be
2899 the one to do set_errno() ? The problem is that currently the addr is where
2900 errno etc. are stashed, but until we run out of hosts to try the errors are
2901 host-specific. Maybe we should enhance the host_item definition? */
2904 sx
->ok
= FALSE
; /* For when reached by GOTO */
2905 set_errno(sx
->addrlist
, errno
, message
,
2906 sx
->conn_args
.host
->next
2910 || errno
== ERRNO_UTF8_FWD
2913 pass_message
, sx
->conn_args
.host
2914 #ifdef EXPERIMENTAL_DSN_INFO
2915 , sx
->smtp_greeting
, sx
->helo_response
2924 (void)smtp_write_command(sx
, SCMD_FLUSH
, "QUIT\r\n");
2927 if (sx
->cctx
.tls_ctx
)
2929 tls_close(sx
->cctx
.tls_ctx
, TLS_SHUTDOWN_NOWAIT
);
2930 sx
->cctx
.tls_ctx
= NULL
;
2934 /* Close the socket, and return the appropriate value, first setting
2935 works because the NULL setting is passed back to the calling process, and
2936 remote_max_parallel is forced to 1 when delivering over an existing connection,
2939 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf_indent(" SMTP(close)>>\n");
2942 shutdown(sx
->cctx
.sock
, SHUT_WR
);
2943 if (fcntl(sx
->cctx
.sock
, F_SETFL
, O_NONBLOCK
) == 0)
2944 for (rc
= 16; read(sx
->cctx
.sock
, sx
->inbuffer
, sizeof(sx
->inbuffer
)) > 0 && rc
> 0;)
2945 rc
--; /* drain socket */
2946 sx
->send_quit
= FALSE
;
2948 (void)close(sx
->cctx
.sock
);
2951 #ifndef DISABLE_EVENT
2952 (void) event_raise(sx
->conn_args
.tblock
->event_action
, US
"tcp:close", NULL
);
2955 continue_transport
= NULL
;
2956 continue_hostname
= NULL
;
2963 /* Create the string of options that will be appended to the MAIL FROM:
2964 in the connection context buffer */
2967 build_mailcmd_options(smtp_context
* sx
, address_item
* addrlist
)
2969 uschar
* p
= sx
->buffer
;
2970 address_item
* addr
;
2975 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2976 send it, adding something to the message size to allow for imprecision
2977 and things that get added en route. Exim keeps the number of lines
2978 in a message, so we can give an accurate value for the original message, but we
2979 need some additional to handle added headers. (Double "." characters don't get
2980 included in the count.) */
2982 if ( message_size
> 0
2983 && sx
->peer_offered
& OPTION_SIZE
&& !(sx
->avoid_option
& OPTION_SIZE
))
2985 /*XXX problem here under spool_files_wireformat?
2986 Or just forget about lines? Or inflate by a fixed proportion? */
2988 sprintf(CS p
, " SIZE=%d", message_size
+message_linecount
+(SOB sx
->conn_args
.ob
)->size_addition
);
2992 #ifndef DISABLE_PRDR
2993 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2996 sx
->prdr_active
= FALSE
;
2997 if (sx
->peer_offered
& OPTION_PRDR
)
2998 for (addr
= addrlist
; addr
; addr
= addr
->next
)
2999 if (addr
->transport_return
== PENDING_DEFER
)
3001 for (addr
= addr
->next
; addr
; addr
= addr
->next
)
3002 if (addr
->transport_return
== PENDING_DEFER
)
3003 { /* at least two recipients to send */
3004 sx
->prdr_active
= TRUE
;
3005 sprintf(CS p
, " PRDR"); p
+= 5;
3013 /* If it supports internationalised messages, and this meesage need that,
3016 if ( sx
->peer_offered
& OPTION_UTF8
3017 && addrlist
->prop
.utf8_msg
3018 && !addrlist
->prop
.utf8_downcvt
3020 Ustrcpy(p
, " SMTPUTF8"), p
+= 9;
3023 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
3024 if (tls_requiretls
& REQUIRETLS_MSG
)
3025 Ustrcpy(p
, " REQUIRETLS") , p
+= 11;
3028 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3029 for (sx
->dsn_all_lasthop
= TRUE
, addr
= addrlist
, address_count
= 0;
3030 addr
&& address_count
< sx
->max_rcpt
;
3031 addr
= addr
->next
) if (addr
->transport_return
== PENDING_DEFER
)
3034 if (!(addr
->dsn_flags
& rf_dsnlasthop
))
3036 sx
->dsn_all_lasthop
= FALSE
;
3041 /* Add any DSN flags to the mail command */
3043 if (sx
->peer_offered
& OPTION_DSN
&& !sx
->dsn_all_lasthop
)
3045 if (dsn_ret
== dsn_ret_hdrs
)
3046 { Ustrcpy(p
, " RET=HDRS"); p
+= 9; }
3047 else if (dsn_ret
== dsn_ret_full
)
3048 { Ustrcpy(p
, " RET=FULL"); p
+= 9; }
3052 string_format(p
, sizeof(sx
->buffer
) - (p
-sx
->buffer
), " ENVID=%s", dsn_envid
);
3057 /* If an authenticated_sender override has been specified for this transport
3058 instance, expand it. If the expansion is forced to fail, and there was already
3059 an authenticated_sender for this message, the original value will be used.
3060 Other expansion failures are serious. An empty result is ignored, but there is
3061 otherwise no check - this feature is expected to be used with LMTP and other
3062 cases where non-standard addresses (e.g. without domains) might be required. */
3064 if (smtp_mail_auth_str(p
, sizeof(sx
->buffer
) - (p
-sx
->buffer
), addrlist
, sx
->conn_args
.ob
))
3072 build_rcptcmd_options(smtp_context
* sx
, const address_item
* addr
)
3074 uschar
* p
= sx
->buffer
;
3077 /* Add any DSN flags to the rcpt command */
3079 if (sx
->peer_offered
& OPTION_DSN
&& !(addr
->dsn_flags
& rf_dsnlasthop
))
3081 if (addr
->dsn_flags
& rf_dsnflags
)
3086 Ustrcpy(p
, " NOTIFY=");
3088 for (i
= 0; i
< nelem(rf_list
); i
++) if (addr
->dsn_flags
& rf_list
[i
])
3090 if (!first
) *p
++ = ',';
3092 Ustrcpy(p
, rf_names
[i
]);
3097 if (addr
->dsn_orcpt
)
3099 string_format(p
, sizeof(sx
->buffer
) - (p
-sx
->buffer
), " ORCPT=%s",
3110 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3111 -1 MAIL response error
3112 -2 any non-MAIL read i/o error
3113 -3 non-MAIL response timeout
3114 -4 internal error; channel still usable
3119 smtp_write_mail_and_rcpt_cmds(smtp_context
* sx
, int * yield
)
3121 address_item
* addr
;
3125 if (build_mailcmd_options(sx
, sx
->first_addr
) != OK
)
3131 /* From here until we send the DATA command, we can make use of PIPELINING
3132 if the server host supports it. The code has to be able to check the responses
3133 at any point, for when the buffer fills up, so we write it totally generally.
3134 When PIPELINING is off, each command written reports that it has flushed the
3137 sx
->pending_MAIL
= TRUE
; /* The block starts with MAIL */
3140 uschar
* s
= sx
->from_addr
;
3142 uschar
* errstr
= NULL
;
3144 /* If we must downconvert, do the from-address here. Remember we had to
3145 for the to-addresses (done below), and also (ugly) for re-doing when building
3146 the delivery log line. */
3148 if ( sx
->addrlist
->prop
.utf8_msg
3149 && (sx
->addrlist
->prop
.utf8_downcvt
|| !(sx
->peer_offered
& OPTION_UTF8
))
3152 if (s
= string_address_utf8_to_alabel(s
, &errstr
), errstr
)
3154 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
, errstr
, DEFER
, FALSE
);
3158 setflag(sx
->addrlist
, af_utf8_downcvt
);
3162 rc
= smtp_write_command(sx
, pipelining_active ? SCMD_BUFFER
: SCMD_FLUSH
,
3163 "MAIL FROM:<%s>%s\r\n", s
, sx
->buffer
);
3166 mail_command
= string_copy(big_buffer
); /* Save for later error message */
3170 case -1: /* Transmission error */
3173 case +1: /* Cmd was sent */
3174 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
3175 (SOB sx
->conn_args
.ob
)->command_timeout
))
3177 if (errno
== 0 && sx
->buffer
[0] == '4')
3179 errno
= ERRNO_MAIL4XX
;
3180 sx
->addrlist
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
3184 sx
->pending_MAIL
= FALSE
;
3187 /* otherwise zero: command queued for pipeline */
3190 /* Pass over all the relevant recipient addresses for this host, which are the
3191 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3192 several before we have to read the responses for those seen so far. This
3193 checking is done by a subroutine because it also needs to be done at the end.
3194 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3195 the next one if not all are sent.
3197 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3198 last address because we want to abort if any recipients have any kind of
3199 problem, temporary or permanent. We know that all recipient addresses will have
3200 the PENDING_DEFER status, because only one attempt is ever made, and we know
3201 that max_rcpt will be large, so all addresses will be done at once.
3203 For verify we flush the pipeline after any (the only) rcpt address. */
3205 for (addr
= sx
->first_addr
, address_count
= 0;
3206 addr
&& address_count
< sx
->max_rcpt
;
3207 addr
= addr
->next
) if (addr
->transport_return
== PENDING_DEFER
)
3213 addr
->dsn_aware
= sx
->peer_offered
& OPTION_DSN
3214 ? dsn_support_yes
: dsn_support_no
;
3217 no_flush
= pipelining_active
&& !sx
->verify
3218 && (!mua_wrapper
|| addr
->next
&& address_count
< sx
->max_rcpt
);
3220 build_rcptcmd_options(sx
, addr
);
3222 /* Now send the RCPT command, and process outstanding responses when
3223 necessary. After a timeout on RCPT, we just end the function, leaving the
3224 yield as OK, because this error can often mean that there is a problem with
3225 just one address, so we don't want to delay the host. */
3227 rcpt_addr
= transport_rcpt_address(addr
, sx
->conn_args
.tblock
->rcpt_include_affixes
);
3230 if ( testflag(sx
->addrlist
, af_utf8_downcvt
)
3231 && !(rcpt_addr
= string_address_utf8_to_alabel(rcpt_addr
, NULL
))
3234 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3235 errno
= ERRNO_EXPANDFAIL
;
3236 return -5; /*XXX too harsh? */
3240 count
= smtp_write_command(sx
, no_flush ? SCMD_BUFFER
: SCMD_FLUSH
,
3241 "RCPT TO:<%s>%s%s\r\n", rcpt_addr
, sx
->igquotstr
, sx
->buffer
);
3243 if (count
< 0) return -5;
3246 switch(sync_responses(sx
, count
, 0))
3248 case 3: sx
->ok
= TRUE
; /* 2xx & 5xx => OK & progress made */
3249 case 2: sx
->completed_addr
= TRUE
; /* 5xx (only) => progress made */
3252 case 1: sx
->ok
= TRUE
; /* 2xx (only) => OK, but if LMTP, */
3253 if (!sx
->lmtp
) /* can't tell about progress yet */
3254 sx
->completed_addr
= TRUE
;
3255 case 0: /* No 2xx or 5xx, but no probs */
3258 case -1: return -3; /* Timeout on RCPT */
3259 case -2: return -2; /* non-MAIL read i/o error */
3260 default: return -1; /* any MAIL error */
3262 #ifdef EXPERIMENTAL_PIPE_CONNECT
3263 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3266 sx
->pending_MAIL
= FALSE
; /* Dealt with MAIL */
3268 } /* Loop for next address */
3270 sx
->next_addr
= addr
;
3276 /*****************************************************
3277 * Proxy TLS connection for another transport process *
3278 ******************************************************/
3280 Close the unused end of the pipe, fork once more, then use the given buffer
3281 as a staging area, and select on both the given fd and the TLS'd client-fd for
3282 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).