1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Functions concerned with verifying things. The original code for callout
9 caching was contributed by Kevin Fleming (but I hacked it around a bit). */
13 #include "transports/smtp.h"
15 #define CUTTHROUGH_CMD_TIMEOUT 30 /* timeout for cutthrough-routing calls */
16 #define CUTTHROUGH_DATA_TIMEOUT 60 /* timeout for cutthrough-routing calls */
17 address_item cutthrough_addr
;
18 static smtp_outblock ctblock
;
19 uschar ctbuffer
[8192];
22 /* Structure for caching DNSBL lookups */
24 typedef struct dnsbl_cache_block
{
32 /* Anchor for DNSBL cache */
34 static tree_node
*dnsbl_cache
= NULL
;
37 /* Bits for match_type in one_check_dnsbl() */
44 /*************************************************
45 * Retrieve a callout cache record *
46 *************************************************/
48 /* If a record exists, check whether it has expired.
51 dbm_file an open hints file
53 type "address" or "domain"
54 positive_expire expire time for positive records
55 negative_expire expire time for negative records
57 Returns: the cache record if a non-expired one exists, else NULL
60 static dbdata_callout_cache
*
61 get_callout_cache_record(open_db
*dbm_file
, uschar
*key
, uschar
*type
,
62 int positive_expire
, int negative_expire
)
67 dbdata_callout_cache
*cache_record
;
69 cache_record
= dbfn_read_with_length(dbm_file
, key
, &length
);
71 if (cache_record
== NULL
)
73 HDEBUG(D_verify
) debug_printf("callout cache: no %s record found\n", type
);
77 /* We treat a record as "negative" if its result field is not positive, or if
78 it is a domain record and the postmaster field is negative. */
80 negative
= cache_record
->result
!= ccache_accept
||
81 (type
[0] == 'd' && cache_record
->postmaster_result
== ccache_reject
);
82 expire
= negative
? negative_expire
: positive_expire
;
85 if (now
- cache_record
->time_stamp
> expire
)
87 HDEBUG(D_verify
) debug_printf("callout cache: %s record expired\n", type
);
91 /* If this is a non-reject domain record, check for the obsolete format version
92 that doesn't have the postmaster and random timestamps, by looking at the
93 length. If so, copy it to a new-style block, replicating the record's
94 timestamp. Then check the additional timestamps. (There's no point wasting
95 effort if connections are rejected.) */
97 if (type
[0] == 'd' && cache_record
->result
!= ccache_reject
)
99 if (length
== sizeof(dbdata_callout_cache_obs
))
101 dbdata_callout_cache
*new = store_get(sizeof(dbdata_callout_cache
));
102 memcpy(new, cache_record
, length
);
103 new->postmaster_stamp
= new->random_stamp
= new->time_stamp
;
107 if (now
- cache_record
->postmaster_stamp
> expire
)
108 cache_record
->postmaster_result
= ccache_unknown
;
110 if (now
- cache_record
->random_stamp
> expire
)
111 cache_record
->random_result
= ccache_unknown
;
114 HDEBUG(D_verify
) debug_printf("callout cache: found %s record\n", type
);
120 /*************************************************
121 * Do callout verification for an address *
122 *************************************************/
124 /* This function is called from verify_address() when the address has routed to
125 a host list, and a callout has been requested. Callouts are expensive; that is
126 why a cache is used to improve the efficiency.
129 addr the address that's been routed
130 host_list the list of hosts to try
131 tf the transport feedback block
133 ifstring "interface" option from transport, or NULL
134 portstring "port" option from transport, or NULL
135 protocolstring "protocol" option from transport, or NULL
136 callout the per-command callout timeout
137 callout_overall the overall callout timeout (if < 0 use 4*callout)
138 callout_connect the callout connection timeout (if < 0 use callout)
139 options the verification options - these bits are used:
140 vopt_is_recipient => this is a recipient address
141 vopt_callout_no_cache => don't use callout cache
142 vopt_callout_fullpm => if postmaster check, do full one
143 vopt_callout_random => do the "random" thing
144 vopt_callout_recipsender => use real sender for recipient
145 vopt_callout_recippmaster => use postmaster for recipient
146 se_mailfrom MAIL FROM address for sender verify; NULL => ""
147 pm_mailfrom if non-NULL, do the postmaster check with this sender
149 Returns: OK/FAIL/DEFER
153 do_callout(address_item
*addr
, host_item
*host_list
, transport_feedback
*tf
,
154 int callout
, int callout_overall
, int callout_connect
, int options
,
155 uschar
*se_mailfrom
, uschar
*pm_mailfrom
)
157 BOOL is_recipient
= (options
& vopt_is_recipient
) != 0;
158 BOOL callout_no_cache
= (options
& vopt_callout_no_cache
) != 0;
159 BOOL callout_random
= (options
& vopt_callout_random
) != 0;
162 int old_domain_cache_result
= ccache_accept
;
165 uschar
*from_address
;
166 uschar
*random_local_part
= NULL
;
167 uschar
*save_deliver_domain
= deliver_domain
;
168 uschar
**failure_ptr
= is_recipient
?
169 &recipient_verify_failure
: &sender_verify_failure
;
171 open_db
*dbm_file
= NULL
;
172 dbdata_callout_cache new_domain_record
;
173 dbdata_callout_cache_address new_address_record
;
175 time_t callout_start_time
;
177 new_domain_record
.result
= ccache_unknown
;
178 new_domain_record
.postmaster_result
= ccache_unknown
;
179 new_domain_record
.random_result
= ccache_unknown
;
181 memset(&new_address_record
, 0, sizeof(new_address_record
));
183 /* For a recipient callout, the key used for the address cache record must
184 include the sender address if we are using the real sender in the callout,
185 because that may influence the result of the callout. */
187 address_key
= addr
->address
;
192 if ((options
& vopt_callout_recipsender
) != 0)
194 address_key
= string_sprintf("%s/<%s>", addr
->address
, sender_address
);
195 from_address
= sender_address
;
197 else if ((options
& vopt_callout_recippmaster
) != 0)
199 address_key
= string_sprintf("%s/<postmaster@%s>", addr
->address
,
200 qualify_domain_sender
);
201 from_address
= string_sprintf("postmaster@%s", qualify_domain_sender
);
205 /* For a sender callout, we must adjust the key if the mailfrom address is not
210 from_address
= (se_mailfrom
== NULL
)? US
"" : se_mailfrom
;
211 if (from_address
[0] != 0)
212 address_key
= string_sprintf("%s/<%s>", addr
->address
, from_address
);
215 /* Open the callout cache database, it it exists, for reading only at this
216 stage, unless caching has been disabled. */
218 if (callout_no_cache
)
220 HDEBUG(D_verify
) debug_printf("callout cache: disabled by no_cache\n");
222 else if ((dbm_file
= dbfn_open(US
"callout", O_RDWR
, &dbblock
, FALSE
)) == NULL
)
224 HDEBUG(D_verify
) debug_printf("callout cache: not available\n");
227 /* If a cache database is available see if we can avoid the need to do an
228 actual callout by making use of previously-obtained data. */
230 if (dbm_file
!= NULL
)
232 dbdata_callout_cache_address
*cache_address_record
;
233 dbdata_callout_cache
*cache_record
= get_callout_cache_record(dbm_file
,
234 addr
->domain
, US
"domain",
235 callout_cache_domain_positive_expire
,
236 callout_cache_domain_negative_expire
);
238 /* If an unexpired cache record was found for this domain, see if the callout
239 process can be short-circuited. */
241 if (cache_record
!= NULL
)
243 /* In most cases, if an early command (up to and including MAIL FROM:<>)
244 was rejected, there is no point carrying on. The callout fails. However, if
245 we are doing a recipient verification with use_sender or use_postmaster
246 set, a previous failure of MAIL FROM:<> doesn't count, because this time we
247 will be using a non-empty sender. We have to remember this situation so as
248 not to disturb the cached domain value if this whole verification succeeds
249 (we don't want it turning into "accept"). */
251 old_domain_cache_result
= cache_record
->result
;
253 if (cache_record
->result
== ccache_reject
||
254 (*from_address
== 0 && cache_record
->result
== ccache_reject_mfnull
))
256 setflag(addr
, af_verify_nsfail
);
258 debug_printf("callout cache: domain gave initial rejection, or "
259 "does not accept HELO or MAIL FROM:<>\n");
260 setflag(addr
, af_verify_nsfail
);
261 addr
->user_message
= US
"(result of an earlier callout reused).";
263 *failure_ptr
= US
"mail";
267 /* If a previous check on a "random" local part was accepted, we assume
268 that the server does not do any checking on local parts. There is therefore
269 no point in doing the callout, because it will always be successful. If a
270 random check previously failed, arrange not to do it again, but preserve
271 the data in the new record. If a random check is required but hasn't been
272 done, skip the remaining cache processing. */
274 if (callout_random
) switch(cache_record
->random_result
)
278 debug_printf("callout cache: domain accepts random addresses\n");
279 goto END_CALLOUT
; /* Default yield is OK */
283 debug_printf("callout cache: domain rejects random addresses\n");
284 callout_random
= FALSE
;
285 new_domain_record
.random_result
= ccache_reject
;
286 new_domain_record
.random_stamp
= cache_record
->random_stamp
;
291 debug_printf("callout cache: need to check random address handling "
292 "(not cached or cache expired)\n");
296 /* If a postmaster check is requested, but there was a previous failure,
297 there is again no point in carrying on. If a postmaster check is required,
298 but has not been done before, we are going to have to do a callout, so skip
299 remaining cache processing. */
301 if (pm_mailfrom
!= NULL
)
303 if (cache_record
->postmaster_result
== ccache_reject
)
305 setflag(addr
, af_verify_pmfail
);
307 debug_printf("callout cache: domain does not accept "
308 "RCPT TO:<postmaster@domain>\n");
310 *failure_ptr
= US
"postmaster";
311 setflag(addr
, af_verify_pmfail
);
312 addr
->user_message
= US
"(result of earlier verification reused).";
315 if (cache_record
->postmaster_result
== ccache_unknown
)
318 debug_printf("callout cache: need to check RCPT "
319 "TO:<postmaster@domain> (not cached or cache expired)\n");
323 /* If cache says OK, set pm_mailfrom NULL to prevent a redundant
324 postmaster check if the address itself has to be checked. Also ensure
325 that the value in the cache record is preserved (with its old timestamp).
328 HDEBUG(D_verify
) debug_printf("callout cache: domain accepts RCPT "
329 "TO:<postmaster@domain>\n");
331 new_domain_record
.postmaster_result
= ccache_accept
;
332 new_domain_record
.postmaster_stamp
= cache_record
->postmaster_stamp
;
336 /* We can't give a result based on information about the domain. See if there
337 is an unexpired cache record for this specific address (combined with the
338 sender address if we are doing a recipient callout with a non-empty sender).
341 cache_address_record
= (dbdata_callout_cache_address
*)
342 get_callout_cache_record(dbm_file
,
343 address_key
, US
"address",
344 callout_cache_positive_expire
,
345 callout_cache_negative_expire
);
347 if (cache_address_record
!= NULL
)
349 if (cache_address_record
->result
== ccache_accept
)
352 debug_printf("callout cache: address record is positive\n");
357 debug_printf("callout cache: address record is negative\n");
358 addr
->user_message
= US
"Previous (cached) callout verification failure";
359 *failure_ptr
= US
"recipient";
365 /* Close the cache database while we actually do the callout for real. */
368 dbfn_close(dbm_file
);
372 if (!addr
->transport
)
374 HDEBUG(D_verify
) debug_printf("cannot callout via null transport\n");
376 else if (Ustrcmp(addr
->transport
->driver_name
, "smtp") != 0)
377 log_write(0, LOG_MAIN
|LOG_PANIC
|LOG_CONFIG_FOR
, "callout transport '%s': %s is non-smtp",
378 addr
->transport
->name
, addr
->transport
->driver_name
);
381 smtp_transport_options_block
*ob
=
382 (smtp_transport_options_block
*)addr
->transport
->options_block
;
384 /* The information wasn't available in the cache, so we have to do a real
385 callout and save the result in the cache for next time, unless no_cache is set,
386 or unless we have a previously cached negative random result. If we are to test
387 with a random local part, ensure that such a local part is available. If not,
388 log the fact, but carry on without randomming. */
390 if (callout_random
&& callout_random_local_part
!= NULL
)
392 random_local_part
= expand_string(callout_random_local_part
);
393 if (random_local_part
== NULL
)
394 log_write(0, LOG_MAIN
|LOG_PANIC
, "failed to expand "
395 "callout_random_local_part: %s", expand_string_message
);
398 /* Default the connect and overall callout timeouts if not set, and record the
399 time we are starting so that we can enforce it. */
401 if (callout_overall
< 0) callout_overall
= 4 * callout
;
402 if (callout_connect
< 0) callout_connect
= callout
;
403 callout_start_time
= time(NULL
);
405 /* Before doing a real callout, if this is an SMTP connection, flush the SMTP
406 output because a callout might take some time. When PIPELINING is active and
407 there are many recipients, the total time for doing lots of callouts can add up
408 and cause the client to time out. So in this case we forgo the PIPELINING
411 if (smtp_out
!= NULL
&& !disable_callout_flush
) mac_smtp_fflush();
413 /* Now make connections to the hosts and do real callouts. The list of hosts
414 is passed in as an argument. */
416 for (host
= host_list
; host
!= NULL
&& !done
; host
= host
->next
)
418 smtp_inblock inblock
;
419 smtp_outblock outblock
;
422 BOOL send_quit
= TRUE
;
423 uschar
*active_hostname
= smtp_active_hostname
;
427 BOOL suppress_tls
= FALSE
;
428 uschar
*interface
= NULL
; /* Outgoing interface to use; NULL => any */
429 uschar inbuffer
[4096];
430 uschar outbuffer
[1024];
431 uschar responsebuffer
[4096];
433 clearflag(addr
, af_verify_pmfail
); /* postmaster callout flag */
434 clearflag(addr
, af_verify_nsfail
); /* null sender callout flag */
436 /* Skip this host if we don't have an IP address for it. */
438 if (host
->address
== NULL
)
440 DEBUG(D_verify
) debug_printf("no IP address for host name %s: skipping\n",
445 /* Check the overall callout timeout */
447 if (time(NULL
) - callout_start_time
>= callout_overall
)
449 HDEBUG(D_verify
) debug_printf("overall timeout for callout exceeded\n");
453 /* Set IPv4 or IPv6 */
455 host_af
= (Ustrchr(host
->address
, ':') == NULL
)? AF_INET
:AF_INET6
;
457 /* Expand and interpret the interface and port strings. The latter will not
458 be used if there is a host-specific port (e.g. from a manualroute router).
459 This has to be delayed till now, because they may expand differently for
460 different hosts. If there's a failure, log it, but carry on with the
463 deliver_host
= host
->name
;
464 deliver_host_address
= host
->address
;
465 deliver_host_port
= host
->port
;
466 deliver_domain
= addr
->domain
;
468 if (!smtp_get_interface(tf
->interface
, host_af
, addr
, NULL
, &interface
,
470 !smtp_get_port(tf
->port
, addr
, &port
, US
"callout"))
471 log_write(0, LOG_MAIN
|LOG_PANIC
, "<%s>: %s", addr
->address
,
474 /* Set HELO string according to the protocol */
475 lmtp
= Ustrcmp(tf
->protocol
, "lmtp") == 0;
476 smtps
= Ustrcmp(tf
->protocol
, "smtps") == 0;
479 HDEBUG(D_verify
) debug_printf("interface=%s port=%d\n", interface
, port
);
481 /* Set up the buffer for reading SMTP response packets. */
483 inblock
.buffer
= inbuffer
;
484 inblock
.buffersize
= sizeof(inbuffer
);
485 inblock
.ptr
= inbuffer
;
486 inblock
.ptrend
= inbuffer
;
488 /* Set up the buffer for holding SMTP commands while pipelining */
490 outblock
.buffer
= outbuffer
;
491 outblock
.buffersize
= sizeof(outbuffer
);
492 outblock
.ptr
= outbuffer
;
493 outblock
.cmd_count
= 0;
494 outblock
.authenticating
= FALSE
;
496 /* Reset the parameters of a TLS session */
497 tls_out
.cipher
= tls_out
.peerdn
= NULL
;
499 /* Connect to the host; on failure, just loop for the next one, but we
500 set the error for the last one. Use the callout_connect timeout. */
502 tls_retry_connection
:
504 inblock
.sock
= outblock
.sock
=
505 smtp_connect(host
, host_af
, port
, interface
, callout_connect
, TRUE
, NULL
506 #ifdef EXPERIMENTAL_TPDA
507 /*XXX tpda action? NULL for now. */
511 /* reconsider DSCP here */
512 if (inblock
.sock
< 0)
514 addr
->message
= string_sprintf("could not connect to %s [%s]: %s",
515 host
->name
, host
->address
, strerror(errno
));
516 deliver_host
= deliver_host_address
= NULL
;
517 deliver_domain
= save_deliver_domain
;
521 /* Expand the helo_data string to find the host name to use. */
523 if (tf
->helo_data
!= NULL
)
525 uschar
*s
= expand_string(tf
->helo_data
);
527 log_write(0, LOG_MAIN
|LOG_PANIC
, "<%s>: failed to expand transport's "
528 "helo_data value for callout: %s", addr
->address
,
529 expand_string_message
);
530 else active_hostname
= s
;
533 /* Wait for initial response, and send HELO. The smtp_write_command()
534 function leaves its command in big_buffer. This is used in error responses.
535 Initialize it in case the connection is rejected. */
537 Ustrcpy(big_buffer
, "initial connection");
539 /* Unless ssl-on-connect, wait for the initial greeting */
543 if (!smtps
|| (smtps
&& tls_out
.active
>= 0))
546 if (!(done
= smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
), '2', callout
)))
547 goto RESPONSE_FAILED
;
549 #ifdef EXPERIMENTAL_TPDA
550 if (tpda_raise_event(addr
->transport
->tpda_event_action
,
551 US
"smtp:connect", responsebuffer
) == DEFER
)
553 /* Logging? Debug? */
554 goto RESPONSE_FAILED
;
559 /* Not worth checking greeting line for ESMTP support */
560 if (!(esmtp
= verify_check_this_host(&(ob
->hosts_avoid_esmtp
), NULL
,
561 host
->name
, host
->address
, NULL
) != OK
))
563 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
568 if (smtps
&& tls_out
.active
< 0) /* ssl-on-connect, first pass */
571 ob
->tls_tempfail_tryclear
= FALSE
;
573 else /* all other cases */
578 if (!(done
= smtp_write_command(&outblock
, FALSE
, "%s %s\r\n",
579 !esmtp
? "HELO" : lmtp
? "LHLO" : "EHLO", active_hostname
) >= 0))
581 if (!smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
), '2', callout
))
583 if (errno
!= 0 || responsebuffer
[0] == 0 || lmtp
|| !esmtp
|| tls_out
.active
>= 0)
586 goto RESPONSE_FAILED
;
592 goto esmtp_retry
; /* fallback to HELO */
595 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
597 if (esmtp
&& !suppress_tls
&& tls_out
.active
< 0)
599 if (regex_STARTTLS
== NULL
) regex_STARTTLS
=
600 regex_must_compile(US
"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE
, TRUE
);
602 tls_offered
= pcre_exec(regex_STARTTLS
, NULL
, CS responsebuffer
,
603 Ustrlen(responsebuffer
), 0, PCRE_EOPT
, NULL
, 0) >= 0;
610 /* If TLS is available on this connection attempt to
611 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
612 send another EHLO - the server may give a different answer in secure mode. We
613 use a separate buffer for reading the response to STARTTLS so that if it is
614 negative, the original EHLO data is available for subsequent analysis, should
615 the client not be required to use TLS. If the response is bad, copy the buffer
616 for error analysis. */
620 verify_check_this_host(&(ob
->hosts_avoid_tls
), NULL
, host
->name
,
621 host
->address
, NULL
) != OK
&&
622 verify_check_this_host(&(ob
->hosts_verify_avoid_tls
), NULL
, host
->name
,
623 host
->address
, NULL
) != OK
626 uschar buffer2
[4096];
628 && !(done
= smtp_write_command(&outblock
, FALSE
, "STARTTLS\r\n") >= 0))
631 /* If there is an I/O error, transmission of this message is deferred. If
632 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
633 false, we also defer. However, if there is a temporary rejection of STARTTLS
634 and tls_tempfail_tryclear is true, or if there is an outright rejection of
635 STARTTLS, we carry on. This means we will try to send the message in clear,
636 unless the host is in hosts_require_tls (tested below). */
638 if (!smtps
&& !smtp_read_response(&inblock
, buffer2
, sizeof(buffer2
), '2',
639 ob
->command_timeout
))
641 if (errno
!= 0 || buffer2
[0] == 0 ||
642 (buffer2
[0] == '4' && !ob
->tls_tempfail_tryclear
))
644 Ustrncpy(responsebuffer
, buffer2
, sizeof(responsebuffer
));
646 goto RESPONSE_FAILED
;
650 /* STARTTLS accepted or ssl-on-connect: try to negotiate a TLS session. */
653 int oldtimeout
= ob
->command_timeout
;
656 ob
->command_timeout
= callout
;
657 rc
= tls_client_start(inblock
.sock
, host
, addr
, addr
->transport
);
658 ob
->command_timeout
= oldtimeout
;
660 /* TLS negotiation failed; give an error. Try in clear on a new connection,
661 if the options permit it for this host. */
664 if (rc
== DEFER
&& ob
->tls_tempfail_tryclear
&& !smtps
&&
665 verify_check_this_host(&(ob
->hosts_require_tls
), NULL
, host
->name
,
666 host
->address
, NULL
) != OK
)
668 (void)close(inblock
.sock
);
669 #ifdef EXPERIMENTAL_TPDA
670 (void) tpda_raise_event(addr
->transport
->tpda_event_action
,
671 US
"tcp:close", NULL
);
673 log_write(0, LOG_MAIN
, "TLS session failure: delivering unencrypted "
674 "to %s [%s] (not in hosts_require_tls)", host
->name
, host
->address
);
676 goto tls_retry_connection
;
678 /*save_errno = ERRNO_TLSFAILURE;*/
679 /*message = US"failure while setting up TLS session";*/
685 /* TLS session is set up. Copy info for logging. */
686 addr
->cipher
= tls_out
.cipher
;
687 addr
->peerdn
= tls_out
.peerdn
;
689 /* For SMTPS we need to wait for the initial OK response, then do HELO. */
691 goto smtps_redo_greeting
;
693 /* For STARTTLS we need to redo EHLO */
698 /* If the host is required to use a secure channel, ensure that we have one. */
699 if (tls_out
.active
< 0)
700 if (verify_check_this_host(&(ob
->hosts_require_tls
), NULL
, host
->name
,
701 host
->address
, NULL
) == OK
)
703 /*save_errno = ERRNO_TLSREQUIRED;*/
704 log_write(0, LOG_MAIN
, "a TLS session is required for %s [%s], but %s",
705 host
->name
, host
->address
,
706 tls_offered
? "an attempt to start TLS failed" : "the server did not offer TLS support");
711 #endif /*SUPPORT_TLS*/
713 done
= TRUE
; /* so far so good; have response to HELO */
715 /*XXX the EHLO response would be analyzed here for IGNOREQUOTA, SIZE, PIPELINING */
717 /* For now, transport_filter by cutthrough-delivery is not supported */
718 /* Need proper integration with the proper transport mechanism. */
719 if (cutthrough_delivery
)
721 if (addr
->transport
->filter_command
)
723 cutthrough_delivery
= FALSE
;
724 HDEBUG(D_acl
|D_v
) debug_printf("Cutthrough cancelled by presence of transport filter\n");
729 cutthrough_delivery
= FALSE
;
730 HDEBUG(D_acl
|D_v
) debug_printf("Cutthrough cancelled by presence of DKIM signing\n");
739 /* Clear down of the TLS, SMTP and TCP layers on error is handled below. */
741 /* Failure to accept HELO is cached; this blocks the whole domain for all
742 senders. I/O errors and defer responses are not cached. */
746 *failure_ptr
= US
"mail"; /* At or before MAIL */
747 if (errno
== 0 && responsebuffer
[0] == '5')
749 setflag(addr
, af_verify_nsfail
);
750 new_domain_record
.result
= ccache_reject
;
754 /* If we haven't authenticated, but are required to, give up. */
757 else done
= smtp_auth(responsebuffer
, sizeof(responsebuffer
),
758 addr
, host
, ob
, esmtp
, &inblock
, &outblock
) == OK
&&
760 /* Copy AUTH info for logging */
761 ( (addr
->authenticator
= client_authenticator
),
762 (addr
->auth_id
= client_authenticated_id
),
764 /* Build a mail-AUTH string (re-using responsebuffer for convenience */
765 !smtp_mail_auth_str(responsebuffer
, sizeof(responsebuffer
), addr
, ob
)
768 ( (addr
->auth_sndr
= client_authenticated_sender
),
770 /* Send the MAIL command */
771 (smtp_write_command(&outblock
, FALSE
, "MAIL FROM:<%s>%s\r\n",
772 from_address
, responsebuffer
) >= 0)
775 smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
),
778 deliver_host
= deliver_host_address
= NULL
;
779 deliver_domain
= save_deliver_domain
;
781 /* If the host does not accept MAIL FROM:<>, arrange to cache this
782 information, but again, don't record anything for an I/O error or a defer. Do
783 not cache rejections of MAIL when a non-empty sender has been used, because
784 that blocks the whole domain for all senders. */
788 *failure_ptr
= US
"mail"; /* At or before MAIL */
789 if (errno
== 0 && responsebuffer
[0] == '5')
791 setflag(addr
, af_verify_nsfail
);
792 if (from_address
[0] == 0)
793 new_domain_record
.result
= ccache_reject_mfnull
;
797 /* Otherwise, proceed to check a "random" address (if required), then the
798 given address, and the postmaster address (if required). Between each check,
799 issue RSET, because some servers accept only one recipient after MAIL
802 Before doing this, set the result in the domain cache record to "accept",
803 unless its previous value was ccache_reject_mfnull. In that case, the domain
804 rejects MAIL FROM:<> and we want to continue to remember that. When that is
805 the case, we have got here only in the case of a recipient verification with
806 a non-null sender. */
810 new_domain_record
.result
=
811 (old_domain_cache_result
== ccache_reject_mfnull
)?
812 ccache_reject_mfnull
: ccache_accept
;
814 /* Do the random local part check first */
816 if (random_local_part
!= NULL
)
818 uschar randombuffer
[1024];
820 smtp_write_command(&outblock
, FALSE
,
821 "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part
,
822 addr
->domain
) >= 0 &&
823 smtp_read_response(&inblock
, randombuffer
,
824 sizeof(randombuffer
), '2', callout
);
826 /* Remember when we last did a random test */
828 new_domain_record
.random_stamp
= time(NULL
);
830 /* If accepted, we aren't going to do any further tests below. */
834 new_domain_record
.random_result
= ccache_accept
;
837 /* Otherwise, cache a real negative response, and get back to the right
838 state to send RCPT. Unless there's some problem such as a dropped
839 connection, we expect to succeed, because the commands succeeded above. */
843 if (randombuffer
[0] == '5')
844 new_domain_record
.random_result
= ccache_reject
;
847 smtp_write_command(&outblock
, FALSE
, "RSET\r\n") >= 0 &&
848 smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
),
851 smtp_write_command(&outblock
, FALSE
, "MAIL FROM:<%s>\r\n",
852 from_address
) >= 0 &&
853 smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
),
856 else done
= FALSE
; /* Some timeout/connection problem */
859 /* If the host is accepting all local parts, as determined by the "random"
860 check, we don't need to waste time doing any further checking. */
862 if (new_domain_record
.random_result
!= ccache_accept
&& done
)
864 /* Get the rcpt_include_affixes flag from the transport if there is one,
865 but assume FALSE if there is not. */
868 smtp_write_command(&outblock
, FALSE
, "RCPT TO:<%.1000s>\r\n",
869 transport_rcpt_address(addr
,
870 (addr
->transport
== NULL
)? FALSE
:
871 addr
->transport
->rcpt_include_affixes
)) >= 0 &&
872 smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
),
876 new_address_record
.result
= ccache_accept
;
877 else if (errno
== 0 && responsebuffer
[0] == '5')
879 *failure_ptr
= US
"recipient";
880 new_address_record
.result
= ccache_reject
;
883 /* Do postmaster check if requested; if a full check is required, we
884 check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
886 if (done
&& pm_mailfrom
!= NULL
)
888 /*XXX not suitable for cutthrough - sequencing problems */
889 cutthrough_delivery
= FALSE
;
890 HDEBUG(D_acl
|D_v
) debug_printf("Cutthrough cancelled by presence of postmaster verify\n");
893 smtp_write_command(&outblock
, FALSE
, "RSET\r\n") >= 0 &&
894 smtp_read_response(&inblock
, responsebuffer
,
895 sizeof(responsebuffer
), '2', callout
) &&
897 smtp_write_command(&outblock
, FALSE
,
898 "MAIL FROM:<%s>\r\n", pm_mailfrom
) >= 0 &&
899 smtp_read_response(&inblock
, responsebuffer
,
900 sizeof(responsebuffer
), '2', callout
) &&
902 /* First try using the current domain */
905 smtp_write_command(&outblock
, FALSE
,
906 "RCPT TO:<postmaster@%.1000s>\r\n", addr
->domain
) >= 0 &&
907 smtp_read_response(&inblock
, responsebuffer
,
908 sizeof(responsebuffer
), '2', callout
)
913 /* If that doesn't work, and a full check is requested,
914 try without the domain. */
917 (options
& vopt_callout_fullpm
) != 0 &&
918 smtp_write_command(&outblock
, FALSE
,
919 "RCPT TO:<postmaster>\r\n") >= 0 &&
920 smtp_read_response(&inblock
, responsebuffer
,
921 sizeof(responsebuffer
), '2', callout
)
924 /* Sort out the cache record */
926 new_domain_record
.postmaster_stamp
= time(NULL
);
929 new_domain_record
.postmaster_result
= ccache_accept
;
930 else if (errno
== 0 && responsebuffer
[0] == '5')
932 *failure_ptr
= US
"postmaster";
933 setflag(addr
, af_verify_pmfail
);
934 new_domain_record
.postmaster_result
= ccache_reject
;
937 } /* Random not accepted */
938 } /* MAIL FROM: accepted */
940 /* For any failure of the main check, other than a negative response, we just
941 close the connection and carry on. We can identify a negative response by the
942 fact that errno is zero. For I/O errors it will be non-zero
944 Set up different error texts for logging and for sending back to the caller
945 as an SMTP response. Log in all cases, using a one-line format. For sender
946 callouts, give a full response to the caller, but for recipient callouts,
947 don't give the IP address because this may be an internal host whose identity
948 is not to be widely broadcast. */
952 if (errno
== ETIMEDOUT
)
954 HDEBUG(D_verify
) debug_printf("SMTP timeout\n");
959 if (*responsebuffer
== 0) Ustrcpy(responsebuffer
, US
"connection dropped");
962 string_sprintf("response to \"%s\" from %s [%s] was: %s",
963 big_buffer
, host
->name
, host
->address
,
964 string_printing(responsebuffer
));
966 addr
->user_message
= is_recipient
?
967 string_sprintf("Callout verification failed:\n%s", responsebuffer
)
969 string_sprintf("Called: %s\nSent: %s\nResponse: %s",
970 host
->address
, big_buffer
, responsebuffer
);
972 /* Hard rejection ends the process */
974 if (responsebuffer
[0] == '5') /* Address rejected */
982 /* End the SMTP conversation and close the connection. */
984 /* Cutthrough - on a successfull connect and recipient-verify with use-sender
985 and we have no cutthrough conn so far
986 here is where we want to leave the conn open */
987 if ( cutthrough_delivery
990 && (options
& (vopt_callout_recipsender
|vopt_callout_recippmaster
)) == vopt_callout_recipsender
991 && !random_local_part
996 cutthrough_fd
= outblock
.sock
; /* We assume no buffer in use in the outblock */
997 cutthrough_addr
= *addr
; /* Save the address_item for later logging */
998 cutthrough_addr
.next
= NULL
;
999 cutthrough_addr
.host_used
= store_get(sizeof(host_item
));
1000 cutthrough_addr
.host_used
->name
= host
->name
;
1001 cutthrough_addr
.host_used
->address
= host
->address
;
1002 cutthrough_addr
.host_used
->port
= port
;
1004 *(cutthrough_addr
.parent
= store_get(sizeof(address_item
)))= *addr
->parent
;
1005 ctblock
.buffer
= ctbuffer
;
1006 ctblock
.buffersize
= sizeof(ctbuffer
);
1007 ctblock
.ptr
= ctbuffer
;
1008 /* ctblock.cmd_count = 0; ctblock.authenticating = FALSE; */
1009 ctblock
.sock
= cutthrough_fd
;
1013 /* Ensure no cutthrough on multiple address verifies */
1014 if (options
& vopt_callout_recipsender
)
1015 cancel_cutthrough_connection("multiple verify calls");
1016 if (send_quit
) (void)smtp_write_command(&outblock
, FALSE
, "QUIT\r\n");
1019 tls_close(FALSE
, TRUE
);
1021 (void)close(inblock
.sock
);
1022 #ifdef EXPERIMENTAL_TPDA
1023 (void) tpda_raise_event(addr
->transport
->tpda_event_action
,
1024 US
"tcp:close", NULL
);
1028 } /* Loop through all hosts, while !done */
1031 /* If we get here with done == TRUE, a successful callout happened, and yield
1032 will be set OK or FAIL according to the response to the RCPT command.
1033 Otherwise, we looped through the hosts but couldn't complete the business.
1034 However, there may be domain-specific information to cache in both cases.
1036 The value of the result field in the new_domain record is ccache_unknown if
1037 there was an error before or with MAIL FROM:, and errno was not zero,
1038 implying some kind of I/O error. We don't want to write the cache in that case.
1039 Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
1041 if (!callout_no_cache
&& new_domain_record
.result
!= ccache_unknown
)
1043 if ((dbm_file
= dbfn_open(US
"callout", O_RDWR
|O_CREAT
, &dbblock
, FALSE
))
1046 HDEBUG(D_verify
) debug_printf("callout cache: not available\n");
1050 (void)dbfn_write(dbm_file
, addr
->domain
, &new_domain_record
,
1051 (int)sizeof(dbdata_callout_cache
));
1052 HDEBUG(D_verify
) debug_printf("wrote callout cache domain record:\n"
1053 " result=%d postmaster=%d random=%d\n",
1054 new_domain_record
.result
,
1055 new_domain_record
.postmaster_result
,
1056 new_domain_record
.random_result
);
1060 /* If a definite result was obtained for the callout, cache it unless caching
1065 if (!callout_no_cache
&& new_address_record
.result
!= ccache_unknown
)
1067 if (dbm_file
== NULL
)
1068 dbm_file
= dbfn_open(US
"callout", O_RDWR
|O_CREAT
, &dbblock
, FALSE
);
1069 if (dbm_file
== NULL
)
1071 HDEBUG(D_verify
) debug_printf("no callout cache available\n");
1075 (void)dbfn_write(dbm_file
, address_key
, &new_address_record
,
1076 (int)sizeof(dbdata_callout_cache_address
));
1077 HDEBUG(D_verify
) debug_printf("wrote %s callout cache address record\n",
1078 (new_address_record
.result
== ccache_accept
)? "positive" : "negative");
1083 /* Failure to connect to any host, or any response other than 2xx or 5xx is a
1084 temporary error. If there was only one host, and a response was received, leave
1085 it alone if supplying details. Otherwise, give a generic response. */
1089 uschar
*dullmsg
= string_sprintf("Could not complete %s verify callout",
1090 is_recipient
? "recipient" : "sender");
1093 if (host_list
->next
!= NULL
|| addr
->message
== NULL
) addr
->message
= dullmsg
;
1095 addr
->user_message
= (!smtp_return_error_details
)? dullmsg
:
1096 string_sprintf("%s for <%s>.\n"
1097 "The mail server(s) for the domain may be temporarily unreachable, or\n"
1098 "they may be permanently unreachable from this server. In the latter case,\n%s",
1099 dullmsg
, addr
->address
,
1101 "the address will never be accepted."
1103 "you need to change the address or create an MX record for its domain\n"
1104 "if it is supposed to be generally accessible from the Internet.\n"
1105 "Talk to your mail administrator for details.");
1107 /* Force a specific error code */
1109 addr
->basic_errno
= ERRNO_CALLOUTDEFER
;
1112 /* Come here from within the cache-reading code on fast-track exit. */
1115 if (dbm_file
!= NULL
) dbfn_close(dbm_file
);
1121 /* Called after recipient-acl to get a cutthrough connection open when
1122 one was requested and a recipient-verify wasn't subsequently done.
1125 open_cutthrough_connection( address_item
* addr
)
1129 /* Use a recipient-verify-callout to set up the cutthrough connection. */
1130 /* We must use a copy of the address for verification, because it might
1134 HDEBUG(D_acl
) debug_printf("----------- start cutthrough setup ------------\n");
1135 (void) verify_address(&addr2
, NULL
,
1136 vopt_is_recipient
| vopt_callout_recipsender
| vopt_callout_no_cache
,
1137 CUTTHROUGH_CMD_TIMEOUT
, -1, -1,
1139 HDEBUG(D_acl
) debug_printf("----------- end cutthrough setup ------------\n");
1145 /* Send given number of bytes from the buffer */
1147 cutthrough_send(int n
)
1149 if(cutthrough_fd
< 0)
1154 (tls_out
.active
== cutthrough_fd
) ? tls_write(FALSE
, ctblock
.buffer
, n
) :
1156 send(cutthrough_fd
, ctblock
.buffer
, n
, 0) > 0
1159 transport_count
+= n
;
1160 ctblock
.ptr
= ctblock
.buffer
;
1164 HDEBUG(D_transport
|D_acl
) debug_printf("cutthrough_send failed: %s\n", strerror(errno
));
1171 _cutthrough_puts(uschar
* cp
, int n
)
1175 if(ctblock
.ptr
>= ctblock
.buffer
+ctblock
.buffersize
)
1176 if(!cutthrough_send(ctblock
.buffersize
))
1179 *ctblock
.ptr
++ = *cp
++;
1184 /* Buffered output of counted data block. Return boolean success */
1186 cutthrough_puts(uschar
* cp
, int n
)
1188 if (cutthrough_fd
< 0) return TRUE
;
1189 if (_cutthrough_puts(cp
, n
)) return TRUE
;
1190 cancel_cutthrough_connection("transmit failed");
1196 _cutthrough_flush_send( void )
1198 int n
= ctblock
.ptr
-ctblock
.buffer
;
1201 if(!cutthrough_send(n
))
1207 /* Send out any bufferred output. Return boolean success. */
1209 cutthrough_flush_send( void )
1211 if (_cutthrough_flush_send()) return TRUE
;
1212 cancel_cutthrough_connection("transmit failed");
1218 cutthrough_put_nl( void )
1220 return cutthrough_puts(US
"\r\n", 2);
1224 /* Get and check response from cutthrough target */
1226 cutthrough_response(char expect
, uschar
** copy
)
1228 smtp_inblock inblock
;
1229 uschar inbuffer
[4096];
1230 uschar responsebuffer
[4096];
1232 inblock
.buffer
= inbuffer
;
1233 inblock
.buffersize
= sizeof(inbuffer
);
1234 inblock
.ptr
= inbuffer
;
1235 inblock
.ptrend
= inbuffer
;
1236 inblock
.sock
= cutthrough_fd
;
1237 /* this relies on (inblock.sock == tls_out.active) */
1238 if(!smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
), expect
, CUTTHROUGH_DATA_TIMEOUT
))
1239 cancel_cutthrough_connection("target timeout on read");
1244 *copy
= cp
= string_copy(responsebuffer
);
1245 /* Trim the trailing end of line */
1246 cp
+= Ustrlen(responsebuffer
);
1247 if(cp
> *copy
&& cp
[-1] == '\n') *--cp
= '\0';
1248 if(cp
> *copy
&& cp
[-1] == '\r') *--cp
= '\0';
1251 return responsebuffer
[0];
1255 /* Negotiate dataphase with the cutthrough target, returning success boolean */
1257 cutthrough_predata( void )
1259 if(cutthrough_fd
< 0)
1262 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf(" SMTP>> DATA\n");
1263 cutthrough_puts(US
"DATA\r\n", 6);
1264 cutthrough_flush_send();
1266 /* Assume nothing buffered. If it was it gets ignored. */
1267 return cutthrough_response('3', NULL
) == '3';
1271 /* fd and use_crlf args only to match write_chunk() */
1273 cutthrough_write_chunk(int fd
, uschar
* s
, int len
, BOOL use_crlf
)
1276 while(s
&& (s2
= Ustrchr(s
, '\n')))
1278 if(!cutthrough_puts(s
, s2
-s
) || !cutthrough_put_nl())
1286 /* Buffered send of headers. Return success boolean. */
1287 /* Expands newlines to wire format (CR,NL). */
1288 /* Also sends header-terminating blank line. */
1290 cutthrough_headers_send( void )
1292 if(cutthrough_fd
< 0)
1295 /* We share a routine with the mainline transport to handle header add/remove/rewrites,
1296 but having a separate buffered-output function (for now)
1298 HDEBUG(D_acl
) debug_printf("----------- start cutthrough headers send -----------\n");
1300 if (!transport_headers_send(&cutthrough_addr
, cutthrough_fd
,
1301 cutthrough_addr
.transport
->add_headers
, cutthrough_addr
.transport
->remove_headers
,
1302 &cutthrough_write_chunk
, TRUE
,
1303 cutthrough_addr
.transport
->rewrite_rules
, cutthrough_addr
.transport
->rewrite_existflags
))
1306 HDEBUG(D_acl
) debug_printf("----------- done cutthrough headers send ------------\n");
1312 close_cutthrough_connection( const char * why
)
1314 if(cutthrough_fd
>= 0)
1316 /* We could be sending this after a bunch of data, but that is ok as
1317 the only way to cancel the transfer in dataphase is to drop the tcp
1318 conn before the final dot.
1320 ctblock
.ptr
= ctbuffer
;
1321 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf(" SMTP>> QUIT\n");
1322 _cutthrough_puts(US
"QUIT\r\n", 6); /* avoid recursion */
1323 _cutthrough_flush_send();
1324 /* No wait for response */
1327 tls_close(FALSE
, TRUE
);
1329 (void)close(cutthrough_fd
);
1331 HDEBUG(D_acl
) debug_printf("----------- cutthrough shutdown (%s) ------------\n", why
);
1333 ctblock
.ptr
= ctbuffer
;
1337 cancel_cutthrough_connection( const char * why
)
1339 close_cutthrough_connection(why
);
1340 cutthrough_delivery
= FALSE
;
1346 /* Have senders final-dot. Send one to cutthrough target, and grab the response.
1347 Log an OK response as a transmission.
1348 Close the connection.
1349 Return smtp response-class digit.
1352 cutthrough_finaldot( void )
1354 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf(" SMTP>> .\n");
1356 /* Assume data finshed with new-line */
1357 if(!cutthrough_puts(US
".", 1) || !cutthrough_put_nl() || !cutthrough_flush_send())
1358 return cutthrough_addr
.message
;
1360 switch(cutthrough_response('2', &cutthrough_addr
.message
))
1363 delivery_log(LOG_MAIN
, &cutthrough_addr
, (int)'>', NULL
);
1364 close_cutthrough_connection("delivered");
1368 delivery_log(LOG_MAIN
, &cutthrough_addr
, 0, US
"tmp-reject from cutthrough after DATA:");
1372 delivery_log(LOG_MAIN
|LOG_REJECT
, &cutthrough_addr
, 0, US
"rejected after DATA:");
1378 return cutthrough_addr
.message
;
1383 /*************************************************
1384 * Copy error to toplevel address *
1385 *************************************************/
1387 /* This function is used when a verify fails or defers, to ensure that the
1388 failure or defer information is in the original toplevel address. This applies
1389 when an address is redirected to a single new address, and the failure or
1390 deferral happens to the child address.
1393 vaddr the verify address item
1394 addr the final address item
1397 Returns: the value of YIELD
1401 copy_error(address_item
*vaddr
, address_item
*addr
, int yield
)
1405 vaddr
->message
= addr
->message
;
1406 vaddr
->user_message
= addr
->user_message
;
1407 vaddr
->basic_errno
= addr
->basic_errno
;
1408 vaddr
->more_errno
= addr
->more_errno
;
1409 vaddr
->p
.address_data
= addr
->p
.address_data
;
1410 copyflag(vaddr
, addr
, af_pass_message
);
1418 /**************************************************
1419 * printf that automatically handles TLS if needed *
1420 ***************************************************/
1422 /* This function is used by verify_address() as a substitute for all fprintf()
1423 calls; a direct fprintf() will not produce output in a TLS SMTP session, such
1424 as a response to an EXPN command. smtp_in.c makes smtp_printf available but
1425 that assumes that we always use the smtp_out FILE* when not using TLS or the
1426 ssl buffer when we are. Instead we take a FILE* parameter and check to see if
1427 that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular
1431 f the candidate FILE* to write to
1432 format format string
1433 ... optional arguments
1439 static void PRINTF_FUNCTION(2,3)
1440 respond_printf(FILE *f
, const char *format
, ...)
1444 va_start(ap
, format
);
1445 if (smtp_out
&& (f
== smtp_out
))
1446 smtp_vprintf(format
, ap
);
1448 vfprintf(f
, format
, ap
);
1454 /*************************************************
1455 * Verify an email address *
1456 *************************************************/
1458 /* This function is used both for verification (-bv and at other times) and
1459 address testing (-bt), which is indicated by address_test_mode being set.
1462 vaddr contains the address to verify; the next field in this block
1464 f if not NULL, write the result to this file
1465 options various option bits:
1466 vopt_fake_sender => this sender verify is not for the real
1467 sender (it was verify=sender=xxxx or an address from a
1468 header line) - rewriting must not change sender_address
1469 vopt_is_recipient => this is a recipient address, otherwise
1470 it's a sender address - this affects qualification and
1471 rewriting and messages from callouts
1472 vopt_qualify => qualify an unqualified address; else error
1473 vopt_expn => called from SMTP EXPN command
1474 vopt_success_on_redirect => when a new address is generated
1475 the verification instantly succeeds
1477 These ones are used by do_callout() -- the options variable
1480 vopt_callout_fullpm => if postmaster check, do full one
1481 vopt_callout_no_cache => don't use callout cache
1482 vopt_callout_random => do the "random" thing
1483 vopt_callout_recipsender => use real sender for recipient
1484 vopt_callout_recippmaster => use postmaster for recipient
1486 callout if > 0, specifies that callout is required, and gives timeout
1487 for individual commands
1488 callout_overall if > 0, gives overall timeout for the callout function;
1489 if < 0, a default is used (see do_callout())
1490 callout_connect the connection timeout for callouts
1491 se_mailfrom when callout is requested to verify a sender, use this
1492 in MAIL FROM; NULL => ""
1493 pm_mailfrom when callout is requested, if non-NULL, do the postmaster
1494 thing and use this as the sender address (may be "")
1496 routed if not NULL, set TRUE if routing succeeded, so we can
1497 distinguish between routing failed and callout failed
1499 Returns: OK address verified
1500 FAIL address failed to verify
1501 DEFER can't tell at present
1505 verify_address(address_item
*vaddr
, FILE *f
, int options
, int callout
,
1506 int callout_overall
, int callout_connect
, uschar
*se_mailfrom
,
1507 uschar
*pm_mailfrom
, BOOL
*routed
)
1510 BOOL full_info
= (f
== NULL
)? FALSE
: (debug_selector
!= 0);
1511 BOOL is_recipient
= (options
& vopt_is_recipient
) != 0;
1512 BOOL expn
= (options
& vopt_expn
) != 0;
1513 BOOL success_on_redirect
= (options
& vopt_success_on_redirect
) != 0;
1516 int verify_type
= expn
? v_expn
:
1517 address_test_mode
? v_none
:
1518 is_recipient
? v_recipient
: v_sender
;
1519 address_item
*addr_list
;
1520 address_item
*addr_new
= NULL
;
1521 address_item
*addr_remote
= NULL
;
1522 address_item
*addr_local
= NULL
;
1523 address_item
*addr_succeed
= NULL
;
1524 uschar
**failure_ptr
= is_recipient
?
1525 &recipient_verify_failure
: &sender_verify_failure
;
1526 uschar
*ko_prefix
, *cr
;
1527 uschar
*address
= vaddr
->address
;
1528 uschar
*save_sender
;
1529 uschar null_sender
[] = { 0 }; /* Ensure writeable memory */
1531 /* Clear, just in case */
1533 *failure_ptr
= NULL
;
1535 /* Set up a prefix and suffix for error message which allow us to use the same
1536 output statements both in EXPN mode (where an SMTP response is needed) and when
1537 debugging with an output file. */
1541 ko_prefix
= US
"553 ";
1544 else ko_prefix
= cr
= US
"";
1546 /* Add qualify domain if permitted; otherwise an unqualified address fails. */
1548 if (parse_find_at(address
) == NULL
)
1550 if ((options
& vopt_qualify
) == 0)
1553 respond_printf(f
, "%sA domain is required for \"%s\"%s\n",
1554 ko_prefix
, address
, cr
);
1555 *failure_ptr
= US
"qualify";
1558 address
= rewrite_address_qualify(address
, is_recipient
);
1563 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1564 debug_printf("%s %s\n", address_test_mode
? "Testing" : "Verifying", address
);
1567 /* Rewrite and report on it. Clear the domain and local part caches - these
1568 may have been set by domains and local part tests during an ACL. */
1570 if (global_rewrite_rules
!= NULL
)
1572 uschar
*old
= address
;
1573 address
= rewrite_address(address
, is_recipient
, FALSE
,
1574 global_rewrite_rules
, rewrite_existflags
);
1577 for (i
= 0; i
< (MAX_NAMED_LIST
* 2)/32; i
++) vaddr
->localpart_cache
[i
] = 0;
1578 for (i
= 0; i
< (MAX_NAMED_LIST
* 2)/32; i
++) vaddr
->domain_cache
[i
] = 0;
1579 if (f
!= NULL
&& !expn
) fprintf(f
, "Address rewritten as: %s\n", address
);
1583 /* If this is the real sender address, we must update sender_address at
1584 this point, because it may be referred to in the routers. */
1586 if ((options
& (vopt_fake_sender
|vopt_is_recipient
)) == 0)
1587 sender_address
= address
;
1589 /* If the address was rewritten to <> no verification can be done, and we have
1590 to return OK. This rewriting is permitted only for sender addresses; for other
1591 addresses, such rewriting fails. */
1593 if (address
[0] == 0) return OK
;
1595 /* Flip the legacy TLS-related variables over to the outbound set in case
1596 they're used in the context of a transport used by verification. Reset them
1597 at exit from this routine. */
1599 tls_modify_variables(&tls_out
);
1601 /* Save a copy of the sender address for re-instating if we change it to <>
1602 while verifying a sender address (a nice bit of self-reference there). */
1604 save_sender
= sender_address
;
1606 /* Update the address structure with the possibly qualified and rewritten
1607 address. Set it up as the starting address on the chain of new addresses. */
1609 vaddr
->address
= address
;
1612 /* We need a loop, because an address can generate new addresses. We must also
1613 cope with generated pipes and files at the top level. (See also the code and
1614 comment in deliver.c.) However, it is usually the case that the router for
1615 user's .forward files has its verify flag turned off.
1617 If an address generates more than one child, the loop is used only when
1618 full_info is set, and this can only be set locally. Remote enquiries just get
1619 information about the top level address, not anything that it generated. */
1621 while (addr_new
!= NULL
)
1624 address_item
*addr
= addr_new
;
1626 addr_new
= addr
->next
;
1631 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1632 debug_printf("Considering %s\n", addr
->address
);
1635 /* Handle generated pipe, file or reply addresses. We don't get these
1636 when handling EXPN, as it does only one level of expansion. */
1638 if (testflag(addr
, af_pfr
))
1645 if (addr
->address
[0] == '>')
1647 allow
= testflag(addr
, af_allow_reply
);
1648 fprintf(f
, "%s -> mail %s", addr
->parent
->address
, addr
->address
+ 1);
1652 allow
= (addr
->address
[0] == '|')?
1653 testflag(addr
, af_allow_pipe
) : testflag(addr
, af_allow_file
);
1654 fprintf(f
, "%s -> %s", addr
->parent
->address
, addr
->address
);
1657 if (addr
->basic_errno
== ERRNO_BADTRANSPORT
)
1658 fprintf(f
, "\n*** Error in setting up pipe, file, or autoreply:\n"
1659 "%s\n", addr
->message
);
1661 fprintf(f
, "\n transport = %s\n", addr
->transport
->name
);
1663 fprintf(f
, " *** forbidden ***\n");
1668 /* Just in case some router parameter refers to it. */
1670 return_path
= (addr
->p
.errors_address
!= NULL
)?
1671 addr
->p
.errors_address
: sender_address
;
1673 /* Split the address into domain and local part, handling the %-hack if
1674 necessary, and then route it. While routing a sender address, set
1675 $sender_address to <> because that is what it will be if we were trying to
1676 send a bounce to the sender. */
1678 if (routed
!= NULL
) *routed
= FALSE
;
1679 if ((rc
= deliver_split_address(addr
)) == OK
)
1681 if (!is_recipient
) sender_address
= null_sender
;
1682 rc
= route_address(addr
, &addr_local
, &addr_remote
, &addr_new
,
1683 &addr_succeed
, verify_type
);
1684 sender_address
= save_sender
; /* Put back the real sender */
1687 /* If routing an address succeeded, set the flag that remembers, for use when
1688 an ACL cached a sender verify (in case a callout fails). Then if routing set
1689 up a list of hosts or the transport has a host list, and the callout option
1690 is set, and we aren't in a host checking run, do the callout verification,
1691 and set another flag that notes that a callout happened. */
1695 if (routed
!= NULL
) *routed
= TRUE
;
1698 host_item
*host_list
= addr
->host_list
;
1700 /* Make up some data for use in the case where there is no remote
1703 transport_feedback tf
= {
1704 NULL
, /* interface (=> any) */
1705 US
"smtp", /* port */
1706 US
"smtp", /* protocol */
1708 US
"$smtp_active_hostname", /* helo_data */
1709 FALSE
, /* hosts_override */
1710 FALSE
, /* hosts_randomize */
1711 FALSE
, /* gethostbyname */
1712 TRUE
, /* qualify_single */
1713 FALSE
/* search_parents */
1716 /* If verification yielded a remote transport, we want to use that
1717 transport's options, so as to mimic what would happen if we were really
1718 sending a message to this address. */
1720 if (addr
->transport
!= NULL
&& !addr
->transport
->info
->local
)
1722 (void)(addr
->transport
->setup
)(addr
->transport
, addr
, &tf
, 0, 0, NULL
);
1724 /* If the transport has hosts and the router does not, or if the
1725 transport is configured to override the router's hosts, we must build a
1726 host list of the transport's hosts, and find the IP addresses */
1728 if (tf
.hosts
!= NULL
&& (host_list
== NULL
|| tf
.hosts_override
))
1731 uschar
*save_deliver_domain
= deliver_domain
;
1732 uschar
*save_deliver_localpart
= deliver_localpart
;
1734 host_list
= NULL
; /* Ignore the router's hosts */
1736 deliver_domain
= addr
->domain
;
1737 deliver_localpart
= addr
->local_part
;
1738 s
= expand_string(tf
.hosts
);
1739 deliver_domain
= save_deliver_domain
;
1740 deliver_localpart
= save_deliver_localpart
;
1744 log_write(0, LOG_MAIN
|LOG_PANIC
, "failed to expand list of hosts "
1745 "\"%s\" in %s transport for callout: %s", tf
.hosts
,
1746 addr
->transport
->name
, expand_string_message
);
1751 uschar
*canonical_name
;
1752 host_item
*host
, *nexthost
;
1753 host_build_hostlist(&host_list
, s
, tf
.hosts_randomize
);
1755 /* Just ignore failures to find a host address. If we don't manage
1756 to find any addresses, the callout will defer. Note that more than
1757 one address may be found for a single host, which will result in
1758 additional host items being inserted into the chain. Hence we must
1759 save the next host first. */
1761 flags
= HOST_FIND_BY_A
;
1762 if (tf
.qualify_single
) flags
|= HOST_FIND_QUALIFY_SINGLE
;
1763 if (tf
.search_parents
) flags
|= HOST_FIND_SEARCH_PARENTS
;
1765 for (host
= host_list
; host
!= NULL
; host
= nexthost
)
1767 nexthost
= host
->next
;
1768 if (tf
.gethostbyname
||
1769 string_is_ip_address(host
->name
, NULL
) != 0)
1770 (void)host_find_byname(host
, NULL
, flags
, &canonical_name
, TRUE
);
1773 uschar
* d_request
= NULL
, * d_require
= NULL
;
1774 if (Ustrcmp(addr
->transport
->driver_name
, "smtp") == 0)
1776 smtp_transport_options_block
* ob
=
1777 (smtp_transport_options_block
*)
1778 addr
->transport
->options_block
;
1779 d_request
= ob
->dnssec_request_domains
;
1780 d_require
= ob
->dnssec_require_domains
;
1783 (void)host_find_bydns(host
, NULL
, flags
, NULL
, NULL
, NULL
,
1784 d_request
, d_require
, &canonical_name
, NULL
);
1791 /* Can only do a callout if we have at least one host! If the callout
1792 fails, it will have set ${sender,recipient}_verify_failure. */
1794 if (host_list
!= NULL
)
1796 HDEBUG(D_verify
) debug_printf("Attempting full verification using callout\n");
1797 if (host_checking
&& !host_checking_callout
)
1800 debug_printf("... callout omitted by default when host testing\n"
1801 "(Use -bhc if you want the callouts to happen.)\n");
1806 deliver_set_expansions(addr
);
1808 rc
= do_callout(addr
, host_list
, &tf
, callout
, callout_overall
,
1809 callout_connect
, options
, se_mailfrom
, pm_mailfrom
);
1814 HDEBUG(D_verify
) debug_printf("Cannot do callout: neither router nor "
1815 "transport provided a host list\n");
1820 /* Otherwise, any failure is a routing failure */
1822 else *failure_ptr
= US
"route";
1824 /* A router may return REROUTED if it has set up a child address as a result
1825 of a change of domain name (typically from widening). In this case we always
1826 want to continue to verify the new child. */
1828 if (rc
== REROUTED
) continue;
1830 /* Handle hard failures */
1837 address_item
*p
= addr
->parent
;
1839 respond_printf(f
, "%s%s %s", ko_prefix
,
1840 full_info
? addr
->address
: address
,
1841 address_test_mode
? "is undeliverable" : "failed to verify");
1842 if (!expn
&& admin_user
)
1844 if (addr
->basic_errno
> 0)
1845 respond_printf(f
, ": %s", strerror(addr
->basic_errno
));
1846 if (addr
->message
!= NULL
)
1847 respond_printf(f
, ": %s", addr
->message
);
1850 /* Show parents iff doing full info */
1852 if (full_info
) while (p
!= NULL
)
1854 respond_printf(f
, "%s\n <-- %s", cr
, p
->address
);
1857 respond_printf(f
, "%s\n", cr
);
1859 cancel_cutthrough_connection("routing hard fail");
1863 yield
= copy_error(vaddr
, addr
, FAIL
);
1871 else if (rc
== DEFER
)
1876 address_item
*p
= addr
->parent
;
1877 respond_printf(f
, "%s%s cannot be resolved at this time", ko_prefix
,
1878 full_info
? addr
->address
: address
);
1879 if (!expn
&& admin_user
)
1881 if (addr
->basic_errno
> 0)
1882 respond_printf(f
, ": %s", strerror(addr
->basic_errno
));
1883 if (addr
->message
!= NULL
)
1884 respond_printf(f
, ": %s", addr
->message
);
1885 else if (addr
->basic_errno
<= 0)
1886 respond_printf(f
, ": unknown error");
1889 /* Show parents iff doing full info */
1891 if (full_info
) while (p
!= NULL
)
1893 respond_printf(f
, "%s\n <-- %s", cr
, p
->address
);
1896 respond_printf(f
, "%s\n", cr
);
1898 cancel_cutthrough_connection("routing soft fail");
1902 yield
= copy_error(vaddr
, addr
, DEFER
);
1905 else if (yield
== OK
) yield
= DEFER
;
1908 /* If we are handling EXPN, we do not want to continue to route beyond
1909 the top level (whose address is in "address"). */
1913 uschar
*ok_prefix
= US
"250-";
1914 if (addr_new
== NULL
)
1916 if (addr_local
== NULL
&& addr_remote
== NULL
)
1917 respond_printf(f
, "250 mail to <%s> is discarded\r\n", address
);
1919 respond_printf(f
, "250 <%s>\r\n", address
);
1921 else while (addr_new
!= NULL
)
1923 address_item
*addr2
= addr_new
;
1924 addr_new
= addr2
->next
;
1925 if (addr_new
== NULL
) ok_prefix
= US
"250 ";
1926 respond_printf(f
, "%s<%s>\r\n", ok_prefix
, addr2
->address
);
1932 /* Successful routing other than EXPN. */
1936 /* Handle successful routing when short info wanted. Otherwise continue for
1937 other (generated) addresses. Short info is the operational case. Full info
1938 can be requested only when debug_selector != 0 and a file is supplied.
1940 There is a conflict between the use of aliasing as an alternate email
1941 address, and as a sort of mailing list. If an alias turns the incoming
1942 address into just one address (e.g. J.Caesar->jc44) you may well want to
1943 carry on verifying the generated address to ensure it is valid when
1944 checking incoming mail. If aliasing generates multiple addresses, you
1945 probably don't want to do this. Exim therefore treats the generation of
1946 just a single new address as a special case, and continues on to verify the
1947 generated address. */
1949 if (!full_info
&& /* Stop if short info wanted AND */
1950 (((addr_new
== NULL
|| /* No new address OR */
1951 addr_new
->next
!= NULL
|| /* More than one new address OR */
1952 testflag(addr_new
, af_pfr
))) /* New address is pfr */
1954 (addr_new
!= NULL
&& /* At least one new address AND */
1955 success_on_redirect
))) /* success_on_redirect is set */
1957 if (f
!= NULL
) fprintf(f
, "%s %s\n", address
,
1958 address_test_mode
? "is deliverable" : "verified");
1960 /* If we have carried on to verify a child address, we want the value
1961 of $address_data to be that of the child */
1963 vaddr
->p
.address_data
= addr
->p
.address_data
;
1968 } /* Loop for generated addresses */
1970 /* Display the full results of the successful routing, including any generated
1971 addresses. Control gets here only when full_info is set, which requires f not
1972 to be NULL, and this occurs only when a top-level verify is called with the
1973 debugging switch on.
1975 If there are no local and no remote addresses, and there were no pipes, files,
1976 or autoreplies, and there were no errors or deferments, the message is to be
1977 discarded, usually because of the use of :blackhole: in an alias file. */
1979 if (allok
&& addr_local
== NULL
&& addr_remote
== NULL
)
1981 fprintf(f
, "mail to %s is discarded\n", address
);
1985 for (addr_list
= addr_local
, i
= 0; i
< 2; addr_list
= addr_remote
, i
++)
1987 while (addr_list
!= NULL
)
1989 address_item
*addr
= addr_list
;
1990 address_item
*p
= addr
->parent
;
1991 addr_list
= addr
->next
;
1993 fprintf(f
, "%s", CS addr
->address
);
1994 #ifdef EXPERIMENTAL_SRS
1995 if(addr
->p
.srs_sender
)
1996 fprintf(f
, " [srs = %s]", addr
->p
.srs_sender
);
1999 /* If the address is a duplicate, show something about it. */
2001 if (!testflag(addr
, af_pfr
))
2004 if ((tnode
= tree_search(tree_duplicates
, addr
->unique
)) != NULL
)
2005 fprintf(f
, " [duplicate, would not be delivered]");
2006 else tree_add_duplicate(addr
->unique
, addr
);
2009 /* Now show its parents */
2013 fprintf(f
, "\n <-- %s", p
->address
);
2018 /* Show router, and transport */
2020 fprintf(f
, "router = %s, ", addr
->router
->name
);
2021 fprintf(f
, "transport = %s\n", (addr
->transport
== NULL
)? US
"unset" :
2022 addr
->transport
->name
);
2024 /* Show any hosts that are set up by a router unless the transport
2025 is going to override them; fiddle a bit to get a nice format. */
2027 if (addr
->host_list
!= NULL
&& addr
->transport
!= NULL
&&
2028 !addr
->transport
->overrides_hosts
)
2033 for (h
= addr
->host_list
; h
!= NULL
; h
= h
->next
)
2035 int len
= Ustrlen(h
->name
);
2036 if (len
> maxlen
) maxlen
= len
;
2037 len
= (h
->address
!= NULL
)? Ustrlen(h
->address
) : 7;
2038 if (len
> maxaddlen
) maxaddlen
= len
;
2040 for (h
= addr
->host_list
; h
!= NULL
; h
= h
->next
)
2042 int len
= Ustrlen(h
->name
);
2043 fprintf(f
, " host %s ", h
->name
);
2044 while (len
++ < maxlen
) fprintf(f
, " ");
2045 if (h
->address
!= NULL
)
2047 fprintf(f
, "[%s] ", h
->address
);
2048 len
= Ustrlen(h
->address
);
2050 else if (!addr
->transport
->info
->local
) /* Omit [unknown] for local */
2052 fprintf(f
, "[unknown] ");
2056 while (len
++ < maxaddlen
) fprintf(f
," ");
2057 if (h
->mx
>= 0) fprintf(f
, "MX=%d", h
->mx
);
2058 if (h
->port
!= PORT_NONE
) fprintf(f
, " port=%d", h
->port
);
2059 if (h
->status
== hstatus_unusable
) fprintf(f
, " ** unusable **");
2066 /* Yield will be DEFER or FAIL if any one address has, only for full_info (which is
2067 the -bv or -bt case). */
2070 tls_modify_variables(&tls_in
);
2078 /*************************************************
2079 * Check headers for syntax errors *
2080 *************************************************/
2082 /* This function checks those header lines that contain addresses, and verifies
2083 that all the addresses therein are syntactially correct.
2086 msgptr where to put an error message
2093 verify_check_headers(uschar
**msgptr
)
2099 for (h
= header_list
; h
!= NULL
&& yield
== OK
; h
= h
->next
)
2101 if (h
->type
!= htype_from
&&
2102 h
->type
!= htype_reply_to
&&
2103 h
->type
!= htype_sender
&&
2104 h
->type
!= htype_to
&&
2105 h
->type
!= htype_cc
&&
2106 h
->type
!= htype_bcc
)
2109 colon
= Ustrchr(h
->text
, ':');
2111 while (isspace(*s
)) s
++;
2113 /* Loop for multiple addresses in the header, enabling group syntax. Note
2114 that we have to reset this after the header has been scanned. */
2116 parse_allow_group
= TRUE
;
2120 uschar
*ss
= parse_find_address_end(s
, FALSE
);
2121 uschar
*recipient
, *errmess
;
2122 int terminator
= *ss
;
2123 int start
, end
, domain
;
2125 /* Temporarily terminate the string at this point, and extract the
2126 operative address within, allowing group syntax. */
2129 recipient
= parse_extract_address(s
,&errmess
,&start
,&end
,&domain
,FALSE
);
2132 /* Permit an unqualified address only if the message is local, or if the
2133 sending host is configured to be permitted to send them. */
2135 if (recipient
!= NULL
&& domain
== 0)
2137 if (h
->type
== htype_from
|| h
->type
== htype_sender
)
2139 if (!allow_unqualified_sender
) recipient
= NULL
;
2143 if (!allow_unqualified_recipient
) recipient
= NULL
;
2145 if (recipient
== NULL
) errmess
= US
"unqualified address not permitted";
2148 /* It's an error if no address could be extracted, except for the special
2149 case of an empty address. */
2151 if (recipient
== NULL
&& Ustrcmp(errmess
, "empty address") != 0)
2153 uschar
*verb
= US
"is";
2158 /* Arrange not to include any white space at the end in the
2159 error message or the header name. */
2161 while (t
> s
&& isspace(t
[-1])) t
--;
2162 while (tt
> h
->text
&& isspace(tt
[-1])) tt
--;
2164 /* Add the address that failed to the error message, since in a
2165 header with very many addresses it is sometimes hard to spot
2166 which one is at fault. However, limit the amount of address to
2167 quote - cases have been seen where, for example, a missing double
2168 quote in a humungous To: header creates an "address" that is longer
2169 than string_sprintf can handle. */
2178 *msgptr
= string_printing(
2179 string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s",
2180 errmess
, tt
- h
->text
, h
->text
, verb
, len
, s
));
2183 break; /* Out of address loop */
2186 /* Advance to the next address */
2188 s
= ss
+ (terminator
? 1:0);
2189 while (isspace(*s
)) s
++;
2190 } /* Next address */
2192 parse_allow_group
= FALSE
;
2193 parse_found_group
= FALSE
;
2194 } /* Next header unless yield has been set FALSE */
2200 /*************************************************
2201 * Check header names for 8-bit characters *
2202 *************************************************/
2204 /* This function checks for invalid charcters in header names. See
2205 RFC 5322, 2.2. and RFC 6532, 3.
2208 msgptr where to put an error message
2215 verify_check_header_names_ascii(uschar
**msgptr
)
2220 for (h
= header_list
; h
!= NULL
; h
= h
->next
)
2222 colon
= Ustrchr(h
->text
, ':');
2223 for(s
= h
->text
; s
< colon
; s
++)
2225 if ((*s
< 33) || (*s
> 126))
2227 *msgptr
= string_sprintf("Invalid character in header \"%.*s\" found",
2228 colon
- h
->text
, h
->text
);
2236 /*************************************************
2237 * Check for blind recipients *
2238 *************************************************/
2240 /* This function checks that every (envelope) recipient is mentioned in either
2241 the To: or Cc: header lines, thus detecting blind carbon copies.
2243 There are two ways of scanning that could be used: either scan the header lines
2244 and tick off the recipients, or scan the recipients and check the header lines.
2245 The original proposed patch did the former, but I have chosen to do the latter,
2246 because (a) it requires no memory and (b) will use fewer resources when there
2247 are many addresses in To: and/or Cc: and only one or two envelope recipients.
2250 Returns: OK if there are no blind recipients
2251 FAIL if there is at least one blind recipient
2255 verify_check_notblind(void)
2258 for (i
= 0; i
< recipients_count
; i
++)
2262 uschar
*address
= recipients_list
[i
].address
;
2264 for (h
= header_list
; !found
&& h
!= NULL
; h
= h
->next
)
2268 if (h
->type
!= htype_to
&& h
->type
!= htype_cc
) continue;
2270 colon
= Ustrchr(h
->text
, ':');
2272 while (isspace(*s
)) s
++;
2274 /* Loop for multiple addresses in the header, enabling group syntax. Note
2275 that we have to reset this after the header has been scanned. */
2277 parse_allow_group
= TRUE
;
2281 uschar
*ss
= parse_find_address_end(s
, FALSE
);
2282 uschar
*recipient
,*errmess
;
2283 int terminator
= *ss
;
2284 int start
, end
, domain
;
2286 /* Temporarily terminate the string at this point, and extract the
2287 operative address within, allowing group syntax. */
2290 recipient
= parse_extract_address(s
,&errmess
,&start
,&end
,&domain
,FALSE
);
2293 /* If we found a valid recipient that has a domain, compare it with the
2294 envelope recipient. Local parts are compared case-sensitively, domains
2295 case-insensitively. By comparing from the start with length "domain", we
2296 include the "@" at the end, which ensures that we are comparing the whole
2297 local part of each address. */
2299 if (recipient
!= NULL
&& domain
!= 0)
2301 found
= Ustrncmp(recipient
, address
, domain
) == 0 &&
2302 strcmpic(recipient
+ domain
, address
+ domain
) == 0;
2306 /* Advance to the next address */
2308 s
= ss
+ (terminator
? 1:0);
2309 while (isspace(*s
)) s
++;
2310 } /* Next address */
2312 parse_allow_group
= FALSE
;
2313 parse_found_group
= FALSE
;
2314 } /* Next header (if found is false) */
2316 if (!found
) return FAIL
;
2317 } /* Next recipient */
2324 /*************************************************
2325 * Find if verified sender *
2326 *************************************************/
2328 /* Usually, just a single address is verified as the sender of the message.
2329 However, Exim can be made to verify other addresses as well (often related in
2330 some way), and this is useful in some environments. There may therefore be a
2331 chain of such addresses that have previously been tested. This function finds
2332 whether a given address is on the chain.
2334 Arguments: the address to be verified
2335 Returns: pointer to an address item, or NULL
2339 verify_checked_sender(uschar
*sender
)
2342 for (addr
= sender_verified_list
; addr
!= NULL
; addr
= addr
->next
)
2343 if (Ustrcmp(sender
, addr
->address
) == 0) break;
2351 /*************************************************
2352 * Get valid header address *
2353 *************************************************/
2355 /* Scan the originator headers of the message, looking for an address that
2356 verifies successfully. RFC 822 says:
2358 o The "Sender" field mailbox should be sent notices of
2359 any problems in transport or delivery of the original
2360 messages. If there is no "Sender" field, then the
2361 "From" field mailbox should be used.
2363 o If the "Reply-To" field exists, then the reply should
2364 go to the addresses indicated in that field and not to
2365 the address(es) indicated in the "From" field.
2367 So we check a Sender field if there is one, else a Reply_to field, else a From
2368 field. As some strange messages may have more than one of these fields,
2369 especially if they are resent- fields, check all of them if there is more than
2373 user_msgptr points to where to put a user error message
2374 log_msgptr points to where to put a log error message
2375 callout timeout for callout check (passed to verify_address())
2376 callout_overall overall callout timeout (ditto)
2377 callout_connect connect callout timeout (ditto)
2378 se_mailfrom mailfrom for verify; NULL => ""
2379 pm_mailfrom sender for pm callout check (passed to verify_address())
2380 options callout options (passed to verify_address())
2381 verrno where to put the address basic_errno
2383 If log_msgptr is set to something without setting user_msgptr, the caller
2384 normally uses log_msgptr for both things.
2386 Returns: result of the verification attempt: OK, FAIL, or DEFER;
2387 FAIL is given if no appropriate headers are found
2391 verify_check_header_address(uschar
**user_msgptr
, uschar
**log_msgptr
,
2392 int callout
, int callout_overall
, int callout_connect
, uschar
*se_mailfrom
,
2393 uschar
*pm_mailfrom
, int options
, int *verrno
)
2395 static int header_types
[] = { htype_sender
, htype_reply_to
, htype_from
};
2400 for (i
= 0; i
< 3 && !done
; i
++)
2403 for (h
= header_list
; h
!= NULL
&& !done
; h
= h
->next
)
2405 int terminator
, new_ok
;
2406 uschar
*s
, *ss
, *endname
;
2408 if (h
->type
!= header_types
[i
]) continue;
2409 s
= endname
= Ustrchr(h
->text
, ':') + 1;
2411 /* Scan the addresses in the header, enabling group syntax. Note that we
2412 have to reset this after the header has been scanned. */
2414 parse_allow_group
= TRUE
;
2418 address_item
*vaddr
;
2420 while (isspace(*s
) || *s
== ',') s
++;
2421 if (*s
== 0) break; /* End of header */
2423 ss
= parse_find_address_end(s
, FALSE
);
2425 /* The terminator is a comma or end of header, but there may be white
2426 space preceding it (including newline for the last address). Move back
2427 past any white space so we can check against any cached envelope sender
2428 address verifications. */
2430 while (isspace(ss
[-1])) ss
--;
2434 HDEBUG(D_verify
) debug_printf("verifying %.*s header address %s\n",
2435 (int)(endname
- h
->text
), h
->text
, s
);
2437 /* See if we have already verified this address as an envelope sender,
2438 and if so, use the previous answer. */
2440 vaddr
= verify_checked_sender(s
);
2442 if (vaddr
!= NULL
&& /* Previously checked */
2443 (callout
<= 0 || /* No callout needed; OR */
2444 vaddr
->special_action
> 256)) /* Callout was done */
2446 new_ok
= vaddr
->special_action
& 255;
2447 HDEBUG(D_verify
) debug_printf("previously checked as envelope sender\n");
2448 *ss
= terminator
; /* Restore shortened string */
2451 /* Otherwise we run the verification now. We must restore the shortened
2452 string before running the verification, so the headers are correct, in
2453 case there is any rewriting. */
2457 int start
, end
, domain
;
2458 uschar
*address
= parse_extract_address(s
, log_msgptr
, &start
, &end
,
2463 /* If we found an empty address, just carry on with the next one, but
2464 kill the message. */
2466 if (address
== NULL
&& Ustrcmp(*log_msgptr
, "empty address") == 0)
2473 /* If verification failed because of a syntax error, fail this
2474 function, and ensure that the failing address gets added to the error
2477 if (address
== NULL
)
2480 while (ss
> s
&& isspace(ss
[-1])) ss
--;
2481 *log_msgptr
= string_sprintf("syntax error in '%.*s' header when "
2482 "scanning for sender: %s in \"%.*s\"",
2483 endname
- h
->text
, h
->text
, *log_msgptr
, ss
- s
, s
);
2489 /* Else go ahead with the sender verification. But it isn't *the*
2490 sender of the message, so set vopt_fake_sender to stop sender_address
2491 being replaced after rewriting or qualification. */
2495 vaddr
= deliver_make_addr(address
, FALSE
);
2496 new_ok
= verify_address(vaddr
, NULL
, options
| vopt_fake_sender
,
2497 callout
, callout_overall
, callout_connect
, se_mailfrom
,
2502 /* We now have the result, either newly found, or cached. If we are
2503 giving out error details, set a specific user error. This means that the
2504 last of these will be returned to the user if all three fail. We do not
2505 set a log message - the generic one below will be used. */
2509 *verrno
= vaddr
->basic_errno
;
2510 if (smtp_return_error_details
)
2512 *user_msgptr
= string_sprintf("Rejected after DATA: "
2513 "could not verify \"%.*s\" header address\n%s: %s",
2514 endname
- h
->text
, h
->text
, vaddr
->address
, vaddr
->message
);
2518 /* Success or defer */
2527 if (new_ok
== DEFER
) yield
= DEFER
;
2529 /* Move on to any more addresses in the header */
2532 } /* Next address */
2534 parse_allow_group
= FALSE
;
2535 parse_found_group
= FALSE
;
2536 } /* Next header, unless done */
2537 } /* Next header type unless done */
2539 if (yield
== FAIL
&& *log_msgptr
== NULL
)
2540 *log_msgptr
= US
"there is no valid sender in any header line";
2542 if (yield
== DEFER
&& *log_msgptr
== NULL
)
2543 *log_msgptr
= US
"all attempts to verify a sender in a header line deferred";
2551 /*************************************************
2552 * Get RFC 1413 identification *
2553 *************************************************/
2555 /* Attempt to get an id from the sending machine via the RFC 1413 protocol. If
2556 the timeout is set to zero, then the query is not done. There may also be lists
2557 of hosts and nets which are exempt. To guard against malefactors sending
2558 non-printing characters which could, for example, disrupt a message's headers,
2559 make sure the string consists of printing characters only.
2562 port the port to connect to; usually this is IDENT_PORT (113), but when
2563 running in the test harness with -bh a different value is used.
2567 Side effect: any received ident value is put in sender_ident (NULL otherwise)
2571 verify_get_ident(int port
)
2573 int sock
, host_af
, qlen
;
2574 int received_sender_port
, received_interface_port
, n
;
2576 uschar buffer
[2048];
2578 /* Default is no ident. Check whether we want to do an ident check for this
2581 sender_ident
= NULL
;
2582 if (rfc1413_query_timeout
<= 0 || verify_check_host(&rfc1413_hosts
) != OK
)
2585 DEBUG(D_ident
) debug_printf("doing ident callback\n");
2587 /* Set up a connection to the ident port of the remote host. Bind the local end
2588 to the incoming interface address. If the sender host address is an IPv6
2589 address, the incoming interface address will also be IPv6. */
2591 host_af
= (Ustrchr(sender_host_address
, ':') == NULL
)? AF_INET
: AF_INET6
;
2592 sock
= ip_socket(SOCK_STREAM
, host_af
);
2593 if (sock
< 0) return;
2595 if (ip_bind(sock
, host_af
, interface_address
, 0) < 0)
2597 DEBUG(D_ident
) debug_printf("bind socket for ident failed: %s\n",
2602 if (ip_connect(sock
, host_af
, sender_host_address
, port
, rfc1413_query_timeout
)
2605 if (errno
== ETIMEDOUT
&& (log_extra_selector
& LX_ident_timeout
) != 0)
2607 log_write(0, LOG_MAIN
, "ident connection to %s timed out",
2608 sender_host_address
);
2612 DEBUG(D_ident
) debug_printf("ident connection to %s failed: %s\n",
2613 sender_host_address
, strerror(errno
));
2618 /* Construct and send the query. */
2620 sprintf(CS buffer
, "%d , %d\r\n", sender_host_port
, interface_port
);
2621 qlen
= Ustrlen(buffer
);
2622 if (send(sock
, buffer
, qlen
, 0) < 0)
2624 DEBUG(D_ident
) debug_printf("ident send failed: %s\n", strerror(errno
));
2628 /* Read a response line. We put it into the rest of the buffer, using several
2629 recv() calls if necessary. */
2637 int size
= sizeof(buffer
) - (p
- buffer
);
2639 if (size
<= 0) goto END_OFF
; /* Buffer filled without seeing \n. */
2640 count
= ip_recv(sock
, p
, size
, rfc1413_query_timeout
);
2641 if (count
<= 0) goto END_OFF
; /* Read error or EOF */
2643 /* Scan what we just read, to see if we have reached the terminating \r\n. Be
2644 generous, and accept a plain \n terminator as well. The only illegal
2647 for (pp
= p
; pp
< p
+ count
; pp
++)
2649 if (*pp
== 0) goto END_OFF
; /* Zero octet not allowed */
2652 if (pp
[-1] == '\r') pp
--;
2654 goto GOT_DATA
; /* Break out of both loops */
2658 /* Reached the end of the data without finding \n. Let the loop continue to
2659 read some more, if there is room. */
2666 /* We have received a line of data. Check it carefully. It must start with the
2667 same two port numbers that we sent, followed by data as defined by the RFC. For
2670 12345 , 25 : USERID : UNIX :root
2672 However, the amount of white space may be different to what we sent. In the
2673 "osname" field there may be several sub-fields, comma separated. The data we
2674 actually want to save follows the third colon. Some systems put leading spaces
2675 in it - we discard those. */
2677 if (sscanf(CS buffer
+ qlen
, "%d , %d%n", &received_sender_port
,
2678 &received_interface_port
, &n
) != 2 ||
2679 received_sender_port
!= sender_host_port
||
2680 received_interface_port
!= interface_port
)
2683 p
= buffer
+ qlen
+ n
;
2684 while(isspace(*p
)) p
++;
2685 if (*p
++ != ':') goto END_OFF
;
2686 while(isspace(*p
)) p
++;
2687 if (Ustrncmp(p
, "USERID", 6) != 0) goto END_OFF
;
2689 while(isspace(*p
)) p
++;
2690 if (*p
++ != ':') goto END_OFF
;
2691 while (*p
!= 0 && *p
!= ':') p
++;
2692 if (*p
++ == 0) goto END_OFF
;
2693 while(isspace(*p
)) p
++;
2694 if (*p
== 0) goto END_OFF
;
2696 /* The rest of the line is the data we want. We turn it into printing
2697 characters when we save it, so that it cannot mess up the format of any logging
2698 or Received: lines into which it gets inserted. We keep a maximum of 127
2701 sender_ident
= string_printing(string_copyn(p
, 127));
2702 DEBUG(D_ident
) debug_printf("sender_ident = %s\n", sender_ident
);
2712 /*************************************************
2713 * Match host to a single host-list item *
2714 *************************************************/
2716 /* This function compares a host (name or address) against a single item
2717 from a host list. The host name gets looked up if it is needed and is not
2718 already known. The function is called from verify_check_this_host() via
2719 match_check_list(), which is why most of its arguments are in a single block.
2722 arg the argument block (see below)
2723 ss the host-list item
2724 valueptr where to pass back looked up data, or NULL
2725 error for error message when returning ERROR
2728 host_name (a) the host name, or
2729 (b) NULL, implying use sender_host_name and
2730 sender_host_aliases, looking them up if required, or
2731 (c) the empty string, meaning that only IP address matches
2733 host_address the host address
2734 host_ipv4 the IPv4 address taken from an IPv6 one
2738 DEFER lookup deferred
2739 ERROR (a) failed to find the host name or IP address, or
2740 (b) unknown lookup type specified, or
2741 (c) host name encountered when only IP addresses are
2746 check_host(void *arg
, uschar
*ss
, uschar
**valueptr
, uschar
**error
)
2748 check_host_block
*cb
= (check_host_block
*)arg
;
2751 BOOL iplookup
= FALSE
;
2752 BOOL isquery
= FALSE
;
2753 BOOL isiponly
= cb
->host_name
!= NULL
&& cb
->host_name
[0] == 0;
2758 /* Optimize for the special case when the pattern is "*". */
2760 if (*ss
== '*' && ss
[1] == 0) return OK
;
2762 /* If the pattern is empty, it matches only in the case when there is no host -
2763 this can occur in ACL checking for SMTP input using the -bs option. In this
2764 situation, the host address is the empty string. */
2766 if (cb
->host_address
[0] == 0) return (*ss
== 0)? OK
: FAIL
;
2767 if (*ss
== 0) return FAIL
;
2769 /* If the pattern is precisely "@" then match against the primary host name,
2770 provided that host name matching is permitted; if it's "@[]" match against the
2771 local host's IP addresses. */
2777 if (isiponly
) return ERROR
;
2778 ss
= primary_hostname
;
2780 else if (Ustrcmp(ss
, "@[]") == 0)
2782 ip_address_item
*ip
;
2783 for (ip
= host_find_interfaces(); ip
!= NULL
; ip
= ip
->next
)
2784 if (Ustrcmp(ip
->address
, cb
->host_address
) == 0) return OK
;
2789 /* If the pattern is an IP address, optionally followed by a bitmask count, do
2790 a (possibly masked) comparision with the current IP address. */
2792 if (string_is_ip_address(ss
, &maskoffset
) != 0)
2793 return (host_is_in_net(cb
->host_address
, ss
, maskoffset
)? OK
: FAIL
);
2795 /* The pattern is not an IP address. A common error that people make is to omit
2796 one component of an IPv4 address, either by accident, or believing that, for
2797 example, 1.2.3/24 is the same as 1.2.3.0/24, or 1.2.3 is the same as 1.2.3.0,
2798 which it isn't. (Those applications that do accept 1.2.3 as an IP address
2799 interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an
2800 ancient specification.) To aid in debugging these cases, we give a specific
2801 error if the pattern contains only digits and dots or contains a slash preceded
2802 only by digits and dots (a slash at the start indicates a file name and of
2803 course slashes may be present in lookups, but not preceded only by digits and
2806 for (t
= ss
; isdigit(*t
) || *t
== '.'; t
++);
2807 if (*t
== 0 || (*t
== '/' && t
!= ss
))
2809 *error
= US
"malformed IPv4 address or address mask";
2813 /* See if there is a semicolon in the pattern */
2815 semicolon
= Ustrchr(ss
, ';');
2817 /* If we are doing an IP address only match, then all lookups must be IP
2818 address lookups, even if there is no "net-". */
2822 iplookup
= semicolon
!= NULL
;
2825 /* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is
2826 a lookup on a masked IP network, in textual form. We obey this code even if we
2827 have already set iplookup, so as to skip over the "net-" prefix and to set the
2828 mask length. The net- stuff really only applies to single-key lookups where the
2829 key is implicit. For query-style lookups the key is specified in the query.
2830 From release 4.30, the use of net- for query style is no longer needed, but we
2831 retain it for backward compatibility. */
2833 if (Ustrncmp(ss
, "net", 3) == 0 && semicolon
!= NULL
)
2836 for (t
= ss
+ 3; isdigit(*t
); t
++) mlen
= mlen
* 10 + *t
- '0';
2837 if (mlen
== 0 && t
== ss
+3) mlen
= -1; /* No mask supplied */
2838 iplookup
= (*t
++ == '-');
2842 /* Do the IP address lookup if that is indeed what we have */
2850 uschar
*filename
, *key
, *result
;
2853 /* Find the search type */
2855 search_type
= search_findtype(t
, semicolon
- t
);
2857 if (search_type
< 0) log_write(0, LOG_MAIN
|LOG_PANIC_DIE
, "%s",
2858 search_error_message
);
2860 /* Adjust parameters for the type of lookup. For a query-style lookup, there
2861 is no file name, and the "key" is just the query. For query-style with a file
2862 name, we have to fish the file off the start of the query. For a single-key
2863 lookup, the key is the current IP address, masked appropriately, and
2864 reconverted to text form, with the mask appended. For IPv6 addresses, specify
2865 dot separators instead of colons, except when the lookup type is "iplsearch".
2868 if (mac_islookup(search_type
, lookup_absfilequery
))
2870 filename
= semicolon
+ 1;
2872 while (*key
!= 0 && !isspace(*key
)) key
++;
2873 filename
= string_copyn(filename
, key
- filename
);
2874 while (isspace(*key
)) key
++;
2876 else if (mac_islookup(search_type
, lookup_querystyle
))
2879 key
= semicolon
+ 1;
2881 else /* Single-key style */
2883 int sep
= (Ustrcmp(lookup_list
[search_type
]->name
, "iplsearch") == 0)?
2885 insize
= host_aton(cb
->host_address
, incoming
);
2886 host_mask(insize
, incoming
, mlen
);
2887 (void)host_nmtoa(insize
, incoming
, mlen
, buffer
, sep
);
2889 filename
= semicolon
+ 1;
2892 /* Now do the actual lookup; note that there is no search_close() because
2893 of the caching arrangements. */
2895 handle
= search_open(filename
, search_type
, 0, NULL
, NULL
);
2896 if (handle
== NULL
) log_write(0, LOG_MAIN
|LOG_PANIC_DIE
, "%s",
2897 search_error_message
);
2898 result
= search_find(handle
, filename
, key
, -1, NULL
, 0, 0, NULL
);
2899 if (valueptr
!= NULL
) *valueptr
= result
;
2900 return (result
!= NULL
)? OK
: search_find_defer
? DEFER
: FAIL
;
2903 /* The pattern is not an IP address or network reference of any kind. That is,
2904 it is a host name pattern. If this is an IP only match, there's an error in the
2909 *error
= US
"cannot match host name in match_ip list";
2913 /* Check the characters of the pattern to see if they comprise only letters,
2914 digits, full stops, and hyphens (the constituents of domain names). Allow
2915 underscores, as they are all too commonly found. Sigh. Also, if
2916 allow_utf8_domains is set, allow top-bit characters. */
2918 for (t
= ss
; *t
!= 0; t
++)
2919 if (!isalnum(*t
) && *t
!= '.' && *t
!= '-' && *t
!= '_' &&
2920 (!allow_utf8_domains
|| *t
< 128)) break;
2922 /* If the pattern is a complete domain name, with no fancy characters, look up
2923 its IP address and match against that. Note that a multi-homed host will add
2924 items to the chain. */
2935 rc
= host_find_byname(&h
, NULL
, HOST_FIND_QUALIFY_SINGLE
, NULL
, FALSE
);
2936 if (rc
== HOST_FOUND
|| rc
== HOST_FOUND_LOCAL
)
2939 for (hh
= &h
; hh
!= NULL
; hh
= hh
->next
)
2941 if (host_is_in_net(hh
->address
, cb
->host_address
, 0)) return OK
;
2945 if (rc
== HOST_FIND_AGAIN
) return DEFER
;
2946 *error
= string_sprintf("failed to find IP address for %s", ss
);
2950 /* Almost all subsequent comparisons require the host name, and can be done
2951 using the general string matching function. When this function is called for
2952 outgoing hosts, the name is always given explicitly. If it is NULL, it means we
2953 must use sender_host_name and its aliases, looking them up if necessary. */
2955 if (cb
->host_name
!= NULL
) /* Explicit host name given */
2956 return match_check_string(cb
->host_name
, ss
, -1, TRUE
, TRUE
, TRUE
,
2959 /* Host name not given; in principle we need the sender host name and its
2960 aliases. However, for query-style lookups, we do not need the name if the
2961 query does not contain $sender_host_name. From release 4.23, a reference to
2962 $sender_host_name causes it to be looked up, so we don't need to do the lookup
2965 if ((semicolon
= Ustrchr(ss
, ';')) != NULL
)
2968 int partial
, affixlen
, starflags
, id
;
2971 id
= search_findtype_partial(ss
, &partial
, &affix
, &affixlen
, &starflags
);
2974 if (id
< 0) /* Unknown lookup type */
2976 log_write(0, LOG_MAIN
|LOG_PANIC
, "%s in host list item \"%s\"",
2977 search_error_message
, ss
);
2980 isquery
= mac_islookup(id
, lookup_querystyle
|lookup_absfilequery
);
2985 switch(match_check_string(US
"", ss
, -1, TRUE
, TRUE
, TRUE
, valueptr
))
2988 case DEFER
: return DEFER
;
2989 default: return FAIL
;
2993 /* Not a query-style lookup; must ensure the host name is present, and then we
2994 do a check on the name and all its aliases. */
2996 if (sender_host_name
== NULL
)
2998 HDEBUG(D_host_lookup
)
2999 debug_printf("sender host name required, to match against %s\n", ss
);
3000 if (host_lookup_failed
|| host_name_lookup() != OK
)
3002 *error
= string_sprintf("failed to find host name for %s",
3003 sender_host_address
);;
3006 host_build_sender_fullhost();
3009 /* Match on the sender host name, using the general matching function */
3011 switch(match_check_string(sender_host_name
, ss
, -1, TRUE
, TRUE
, TRUE
,
3015 case DEFER
: return DEFER
;
3018 /* If there are aliases, try matching on them. */
3020 aliases
= sender_host_aliases
;
3021 while (*aliases
!= NULL
)
3023 switch(match_check_string(*aliases
++, ss
, -1, TRUE
, TRUE
, TRUE
, valueptr
))
3026 case DEFER
: return DEFER
;
3035 /*************************************************
3036 * Check a specific host matches a host list *
3037 *************************************************/
3039 /* This function is passed a host list containing items in a number of
3040 different formats and the identity of a host. Its job is to determine whether
3041 the given host is in the set of hosts defined by the list. The host name is
3042 passed as a pointer so that it can be looked up if needed and not already
3043 known. This is commonly the case when called from verify_check_host() to check
3044 an incoming connection. When called from elsewhere the host name should usually
3047 This function is now just a front end to match_check_list(), which runs common
3048 code for scanning a list. We pass it the check_host() function to perform a
3052 listptr pointer to the host list
3053 cache_bits pointer to cache for named lists, or NULL
3054 host_name the host name or NULL, implying use sender_host_name and
3055 sender_host_aliases, looking them up if required
3056 host_address the IP address
3057 valueptr if not NULL, data from a lookup is passed back here
3059 Returns: OK if the host is in the defined set
3060 FAIL if the host is not in the defined set,
3061 DEFER if a data lookup deferred (not a host lookup)
3063 If the host name was needed in order to make a comparison, and could not be
3064 determined from the IP address, the result is FAIL unless the item
3065 "+allow_unknown" was met earlier in the list, in which case OK is returned. */
3068 verify_check_this_host(uschar
**listptr
, unsigned int *cache_bits
,
3069 uschar
*host_name
, uschar
*host_address
, uschar
**valueptr
)
3072 unsigned int *local_cache_bits
= cache_bits
;
3073 uschar
*save_host_address
= deliver_host_address
;
3074 check_host_block cb
;
3075 cb
.host_name
= host_name
;
3076 cb
.host_address
= host_address
;
3078 if (valueptr
!= NULL
) *valueptr
= NULL
;
3080 /* If the host address starts off ::ffff: it is an IPv6 address in
3081 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
3084 cb
.host_ipv4
= (Ustrncmp(host_address
, "::ffff:", 7) == 0)?
3085 host_address
+ 7 : host_address
;
3087 /* During the running of the check, put the IP address into $host_address. In
3088 the case of calls from the smtp transport, it will already be there. However,
3089 in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
3090 the safe side, any existing setting is preserved, though as I write this
3091 (November 2004) I can't see any cases where it is actually needed. */
3093 deliver_host_address
= host_address
;
3094 rc
= match_check_list(
3095 listptr
, /* the list */
3096 0, /* separator character */
3097 &hostlist_anchor
, /* anchor pointer */
3098 &local_cache_bits
, /* cache pointer */
3099 check_host
, /* function for testing */
3100 &cb
, /* argument for function */
3101 MCL_HOST
, /* type of check */
3102 (host_address
== sender_host_address
)?
3103 US
"host" : host_address
, /* text for debugging */
3104 valueptr
); /* where to pass back data */
3105 deliver_host_address
= save_host_address
;
3112 /*************************************************
3113 * Check the remote host matches a list *
3114 *************************************************/
3116 /* This is a front end to verify_check_this_host(), created because checking
3117 the remote host is a common occurrence. With luck, a good compiler will spot
3118 the tail recursion and optimize it. If there's no host address, this is
3119 command-line SMTP input - check against an empty string for the address.
3122 listptr pointer to the host list
3124 Returns: the yield of verify_check_this_host(),
3125 i.e. OK, FAIL, or DEFER
3129 verify_check_host(uschar
**listptr
)
3131 return verify_check_this_host(listptr
, sender_host_cache
, NULL
,
3132 (sender_host_address
== NULL
)? US
"" : sender_host_address
, NULL
);
3139 /*************************************************
3140 * Invert an IP address *
3141 *************************************************/
3143 /* Originally just used for DNS xBL lists, now also used for the
3144 reverse_ip expansion operator.
3147 buffer where to put the answer
3148 address the address to invert
3152 invert_address(uschar
*buffer
, uschar
*address
)
3155 uschar
*bptr
= buffer
;
3157 /* If this is an IPv4 address mapped into IPv6 format, adjust the pointer
3158 to the IPv4 part only. */
3160 if (Ustrncmp(address
, "::ffff:", 7) == 0) address
+= 7;
3162 /* Handle IPv4 address: when HAVE_IPV6 is false, the result of host_aton() is
3165 if (host_aton(address
, bin
) == 1)
3169 for (i
= 0; i
< 4; i
++)
3171 sprintf(CS bptr
, "%d.", x
& 255);
3172 while (*bptr
) bptr
++;
3177 /* Handle IPv6 address. Actually, as far as I know, there are no IPv6 addresses
3178 in any DNS black lists, and the format in which they will be looked up is
3179 unknown. This is just a guess. */
3185 for (j
= 3; j
>= 0; j
--)
3188 for (i
= 0; i
< 8; i
++)
3190 sprintf(CS bptr
, "%x.", x
& 15);
3191 while (*bptr
) bptr
++;
3198 /* Remove trailing period -- this is needed so that both arbitrary
3199 dnsbl keydomains and inverted addresses may be combined with the
3200 same format string, "%s.%s" */
3207 /*************************************************
3208 * Perform a single dnsbl lookup *
3209 *************************************************/
3211 /* This function is called from verify_check_dnsbl() below. It is also called
3212 recursively from within itself when domain and domain_txt are different
3213 pointers, in order to get the TXT record from the alternate domain.
3216 domain the outer dnsbl domain
3217 domain_txt alternate domain to lookup TXT record on success; when the
3218 same domain is to be used, domain_txt == domain (that is,
3219 the pointers must be identical, not just the text)
3220 keydomain the current keydomain (for debug message)
3221 prepend subdomain to lookup (like keydomain, but
3222 reversed if IP address)
3223 iplist the list of matching IP addresses, or NULL for "any"
3224 bitmask true if bitmask matching is wanted
3225 match_type condition for 'succeed' result
3226 0 => Any RR in iplist (=)
3227 1 => No RR in iplist (!=)
3228 2 => All RRs in iplist (==)
3229 3 => Some RRs not in iplist (!==)
3230 the two bits are defined as MT_NOT and MT_ALL
3231 defer_return what to return for a defer
3233 Returns: OK if lookup succeeded
3238 one_check_dnsbl(uschar
*domain
, uschar
*domain_txt
, uschar
*keydomain
,
3239 uschar
*prepend
, uschar
*iplist
, BOOL bitmask
, int match_type
,
3245 dnsbl_cache_block
*cb
;
3246 int old_pool
= store_pool
;
3247 uschar query
[256]; /* DNS domain max length */
3249 /* Construct the specific query domainname */
3251 if (!string_format(query
, sizeof(query
), "%s.%s", prepend
, domain
))
3253 log_write(0, LOG_MAIN
|LOG_PANIC
, "dnslist query is too long "
3254 "(ignored): %s...", query
);
3258 /* Look for this query in the cache. */
3260 t
= tree_search(dnsbl_cache
, query
);
3262 /* If not cached from a previous lookup, we must do a DNS lookup, and
3263 cache the result in permanent memory. */
3267 store_pool
= POOL_PERM
;
3269 /* Set up a tree entry to cache the lookup */
3271 t
= store_get(sizeof(tree_node
) + Ustrlen(query
));
3272 Ustrcpy(t
->name
, query
);
3273 t
->data
.ptr
= cb
= store_get(sizeof(dnsbl_cache_block
));
3274 (void)tree_insertnode(&dnsbl_cache
, t
);
3276 /* Do the DNS loopup . */
3278 HDEBUG(D_dnsbl
) debug_printf("new DNS lookup for %s\n", query
);
3279 cb
->rc
= dns_basic_lookup(&dnsa
, query
, T_A
);
3280 cb
->text_set
= FALSE
;
3284 /* If the lookup succeeded, cache the RHS address. The code allows for
3285 more than one address - this was for complete generality and the possible
3286 use of A6 records. However, A6 records have been reduced to experimental
3287 status (August 2001) and may die out. So they may never get used at all,
3288 let alone in dnsbl records. However, leave the code here, just in case.
3290 Quite apart from one A6 RR generating multiple addresses, there are DNS
3291 lists that return more than one A record, so we must handle multiple
3292 addresses generated in that way as well. */
3294 if (cb
->rc
== DNS_SUCCEED
)
3297 dns_address
**addrp
= &(cb
->rhs
);
3298 for (rr
= dns_next_rr(&dnsa
, &dnss
, RESET_ANSWERS
);
3300 rr
= dns_next_rr(&dnsa
, &dnss
, RESET_NEXT
))
3302 if (rr
->type
== T_A
)
3304 dns_address
*da
= dns_address_from_rr(&dnsa
, rr
);
3308 while (da
->next
!= NULL
) da
= da
->next
;
3309 addrp
= &(da
->next
);
3314 /* If we didn't find any A records, change the return code. This can
3315 happen when there is a CNAME record but there are no A records for what
3318 if (cb
->rhs
== NULL
) cb
->rc
= DNS_NODATA
;
3321 store_pool
= old_pool
;
3324 /* Previous lookup was cached */
3328 HDEBUG(D_dnsbl
) debug_printf("using result of previous DNS lookup\n");
3332 /* We now have the result of the DNS lookup, either newly done, or cached
3333 from a previous call. If the lookup succeeded, check against the address
3334 list if there is one. This may be a positive equality list (introduced by
3335 "="), a negative equality list (introduced by "!="), a positive bitmask
3336 list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/
3338 if (cb
->rc
== DNS_SUCCEED
)
3340 dns_address
*da
= NULL
;
3341 uschar
*addlist
= cb
->rhs
->address
;
3343 /* For A and AAAA records, there may be multiple addresses from multiple
3344 records. For A6 records (currently not expected to be used) there may be
3345 multiple addresses from a single record. */
3347 for (da
= cb
->rhs
->next
; da
!= NULL
; da
= da
->next
)
3348 addlist
= string_sprintf("%s, %s", addlist
, da
->address
);
3350 HDEBUG(D_dnsbl
) debug_printf("DNS lookup for %s succeeded (yielding %s)\n",
3353 /* Address list check; this can be either for equality, or via a bitmask.
3354 In the latter case, all the bits must match. */
3358 for (da
= cb
->rhs
; da
!= NULL
; da
= da
->next
)
3362 uschar
*ptr
= iplist
;
3365 /* Handle exact matching */
3369 while ((res
= string_nextinlist(&ptr
, &ipsep
, ip
, sizeof(ip
))) != NULL
)
3371 if (Ustrcmp(CS da
->address
, ip
) == 0) break;
3375 /* Handle bitmask matching */
3382 /* At present, all known DNS blocking lists use A records, with
3383 IPv4 addresses on the RHS encoding the information they return. I
3384 wonder if this will linger on as the last vestige of IPv4 when IPv6
3385 is ubiquitous? Anyway, for now we use paranoia code to completely
3386 ignore IPv6 addresses. The default mask is 0, which always matches.
3387 We change this only for IPv4 addresses in the list. */
3389 if (host_aton(da
->address
, address
) == 1) mask
= address
[0];
3391 /* Scan the returned addresses, skipping any that are IPv6 */
3393 while ((res
= string_nextinlist(&ptr
, &ipsep
, ip
, sizeof(ip
))) != NULL
)
3395 if (host_aton(ip
, address
) != 1) continue;
3396 if ((address
[0] & mask
) == address
[0]) break;
3402 (a) An IP address in an any ('=') list matched, or
3403 (b) No IP address in an all ('==') list matched
3405 then we're done searching. */
3407 if (((match_type
& MT_ALL
) != 0) == (res
== NULL
)) break;
3410 /* If da == NULL, either
3412 (a) No IP address in an any ('=') list matched, or
3413 (b) An IP address in an all ('==') list didn't match
3415 so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on
3418 if ((match_type
== MT_NOT
|| match_type
== MT_ALL
) != (da
== NULL
))
3426 res
= US
"was no match";
3429 res
= US
"was an exclude match";
3432 res
= US
"was an IP address that did not match";
3435 res
= US
"were no IP addresses that did not match";
3438 debug_printf("=> but we are not accepting this block class because\n");
3439 debug_printf("=> there %s for %s%c%s\n",
3441 ((match_type
& MT_ALL
) == 0)? "" : "=",
3442 bitmask
? '&' : '=', iplist
);
3448 /* Either there was no IP list, or the record matched, implying that the
3449 domain is on the list. We now want to find a corresponding TXT record. If an
3450 alternate domain is specified for the TXT record, call this function
3451 recursively to look that up; this has the side effect of re-checking that
3452 there is indeed an A record at the alternate domain. */
3454 if (domain_txt
!= domain
)
3455 return one_check_dnsbl(domain_txt
, domain_txt
, keydomain
, prepend
, NULL
,
3456 FALSE
, match_type
, defer_return
);
3458 /* If there is no alternate domain, look up a TXT record in the main domain
3459 if it has not previously been cached. */
3463 cb
->text_set
= TRUE
;
3464 if (dns_basic_lookup(&dnsa
, query
, T_TXT
) == DNS_SUCCEED
)
3467 for (rr
= dns_next_rr(&dnsa
, &dnss
, RESET_ANSWERS
);
3469 rr
= dns_next_rr(&dnsa
, &dnss
, RESET_NEXT
))
3470 if (rr
->type
== T_TXT
) break;
3473 int len
= (rr
->data
)[0];
3474 if (len
> 511) len
= 127;
3475 store_pool
= POOL_PERM
;
3476 cb
->text
= string_sprintf("%.*s", len
, (const uschar
*)(rr
->data
+1));
3477 store_pool
= old_pool
;
3482 dnslist_value
= addlist
;
3483 dnslist_text
= cb
->text
;
3487 /* There was a problem with the DNS lookup */
3489 if (cb
->rc
!= DNS_NOMATCH
&& cb
->rc
!= DNS_NODATA
)
3491 log_write(L_dnslist_defer
, LOG_MAIN
,
3492 "DNS list lookup defer (probably timeout) for %s: %s", query
,
3493 (defer_return
== OK
)? US
"assumed in list" :
3494 (defer_return
== FAIL
)? US
"assumed not in list" :
3495 US
"returned DEFER");
3496 return defer_return
;
3499 /* No entry was found in the DNS; continue for next domain */
3503 debug_printf("DNS lookup for %s failed\n", query
);
3504 debug_printf("=> that means %s is not listed at %s\n",
3514 /*************************************************
3515 * Check host against DNS black lists *
3516 *************************************************/
3518 /* This function runs checks against a list of DNS black lists, until one
3519 matches. Each item on the list can be of the form
3521 domain=ip-address/key
3523 The domain is the right-most domain that is used for the query, for example,
3524 blackholes.mail-abuse.org. If the IP address is present, there is a match only
3525 if the DNS lookup returns a matching IP address. Several addresses may be
3526 given, comma-separated, for example: x.y.z=127.0.0.1,127.0.0.2.
3528 If no key is given, what is looked up in the domain is the inverted IP address
3529 of the current client host. If a key is given, it is used to construct the
3530 domain for the lookup. For example:
3532 dsn.rfc-ignorant.org/$sender_address_domain
3534 After finding a match in the DNS, the domain is placed in $dnslist_domain, and
3535 then we check for a TXT record for an error message, and if found, save its
3536 value in $dnslist_text. We also cache everything in a tree, to optimize
3539 The TXT record is normally looked up in the same domain as the A record, but
3540 when many lists are combined in a single DNS domain, this will not be a very
3541 specific message. It is possible to specify a different domain for looking up
3542 TXT records; this is given before the main domain, comma-separated. For
3545 dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \
3546 socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3
3548 The caching ensures that only one lookup in dnsbl.sorbs.net is done.
3550 Note: an address for testing RBL is 192.203.178.39
3551 Note: an address for testing DUL is 192.203.178.4
3552 Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org
3555 listptr the domain/address/data list
3557 Returns: OK successful lookup (i.e. the address is on the list), or
3558 lookup deferred after +include_unknown
3559 FAIL name not found, or no data found for the given type, or
3560 lookup deferred after +exclude_unknown (default)
3561 DEFER lookup failure, if +defer_unknown was set
3565 verify_check_dnsbl(uschar
**listptr
)
3568 int defer_return
= FAIL
;
3569 uschar
*list
= *listptr
;
3572 uschar buffer
[1024];
3573 uschar revadd
[128]; /* Long enough for IPv6 address */
3575 /* Indicate that the inverted IP address is not yet set up */
3579 /* In case this is the first time the DNS resolver is being used. */
3581 dns_init(FALSE
, FALSE
, FALSE
); /*XXX dnssec? */
3583 /* Loop through all the domains supplied, until something matches */
3585 while ((domain
= string_nextinlist(&list
, &sep
, buffer
, sizeof(buffer
))) != NULL
)
3588 BOOL bitmask
= FALSE
;
3595 HDEBUG(D_dnsbl
) debug_printf("DNS list check: %s\n", domain
);
3597 /* Deal with special values that change the behaviour on defer */
3599 if (domain
[0] == '+')
3601 if (strcmpic(domain
, US
"+include_unknown") == 0) defer_return
= OK
;
3602 else if (strcmpic(domain
, US
"+exclude_unknown") == 0) defer_return
= FAIL
;
3603 else if (strcmpic(domain
, US
"+defer_unknown") == 0) defer_return
= DEFER
;
3605 log_write(0, LOG_MAIN
|LOG_PANIC
, "unknown item in dnslist (ignored): %s",
3610 /* See if there's explicit data to be looked up */
3612 key
= Ustrchr(domain
, '/');
3613 if (key
!= NULL
) *key
++ = 0;
3615 /* See if there's a list of addresses supplied after the domain name. This is
3616 introduced by an = or a & character; if preceded by = we require all matches
3617 and if preceded by ! we invert the result. */
3619 iplist
= Ustrchr(domain
, '=');
3623 iplist
= Ustrchr(domain
, '&');
3626 if (iplist
!= NULL
) /* Found either = or & */
3628 if (iplist
> domain
&& iplist
[-1] == '!') /* Handle preceding ! */
3630 match_type
|= MT_NOT
;
3634 *iplist
++ = 0; /* Terminate domain, move on */
3636 /* If we found = (bitmask == FALSE), check for == or =& */
3638 if (!bitmask
&& (*iplist
== '=' || *iplist
== '&'))
3640 bitmask
= *iplist
++ == '&';
3641 match_type
|= MT_ALL
;
3645 /* If there is a comma in the domain, it indicates that a second domain for
3646 looking up TXT records is provided, before the main domain. Otherwise we must
3647 set domain_txt == domain. */
3649 domain_txt
= domain
;
3650 comma
= Ustrchr(domain
, ',');
3657 /* Check that what we have left is a sensible domain name. There is no reason
3658 why these domains should in fact use the same syntax as hosts and email
3659 domains, but in practice they seem to. However, there is little point in
3660 actually causing an error here, because that would no doubt hold up incoming
3661 mail. Instead, I'll just log it. */
3663 for (s
= domain
; *s
!= 0; s
++)
3665 if (!isalnum(*s
) && *s
!= '-' && *s
!= '.' && *s
!= '_')
3667 log_write(0, LOG_MAIN
, "dnslists domain \"%s\" contains "
3668 "strange characters - is this right?", domain
);
3673 /* Check the alternate domain if present */
3675 if (domain_txt
!= domain
) for (s
= domain_txt
; *s
!= 0; s
++)
3677 if (!isalnum(*s
) && *s
!= '-' && *s
!= '.' && *s
!= '_')
3679 log_write(0, LOG_MAIN
, "dnslists domain \"%s\" contains "
3680 "strange characters - is this right?", domain_txt
);
3685 /* If there is no key string, construct the query by adding the domain name
3686 onto the inverted host address, and perform a single DNS lookup. */
3690 if (sender_host_address
== NULL
) return FAIL
; /* can never match */
3691 if (revadd
[0] == 0) invert_address(revadd
, sender_host_address
);
3692 rc
= one_check_dnsbl(domain
, domain_txt
, sender_host_address
, revadd
,
3693 iplist
, bitmask
, match_type
, defer_return
);
3696 dnslist_domain
= string_copy(domain_txt
);
3697 dnslist_matched
= string_copy(sender_host_address
);
3698 HDEBUG(D_dnsbl
) debug_printf("=> that means %s is listed at %s\n",
3699 sender_host_address
, dnslist_domain
);
3701 if (rc
!= FAIL
) return rc
; /* OK or DEFER */
3704 /* If there is a key string, it can be a list of domains or IP addresses to
3705 be concatenated with the main domain. */
3712 uschar keybuffer
[256];
3713 uschar keyrevadd
[128];
3715 while ((keydomain
= string_nextinlist(&key
, &keysep
, keybuffer
,
3716 sizeof(keybuffer
))) != NULL
)
3718 uschar
*prepend
= keydomain
;
3720 if (string_is_ip_address(keydomain
, NULL
) != 0)
3722 invert_address(keyrevadd
, keydomain
);
3723 prepend
= keyrevadd
;
3726 rc
= one_check_dnsbl(domain
, domain_txt
, keydomain
, prepend
, iplist
,
3727 bitmask
, match_type
, defer_return
);
3731 dnslist_domain
= string_copy(domain_txt
);
3732 dnslist_matched
= string_copy(keydomain
);
3733 HDEBUG(D_dnsbl
) debug_printf("=> that means %s is listed at %s\n",
3734 keydomain
, dnslist_domain
);
3738 /* If the lookup deferred, remember this fact. We keep trying the rest
3739 of the list to see if we get a useful result, and if we don't, we return
3740 DEFER at the end. */
3742 if (rc
== DEFER
) defer
= TRUE
;
3743 } /* continue with next keystring domain/address */
3745 if (defer
) return DEFER
;
3747 } /* continue with next dnsdb outer domain */
3754 /* End of verify.c */