1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4 /* Experimental DMARC support.
5 Copyright (c) Todd Lyons <tlyons@exim.org> 2012 - 2014
6 Copyright (c) The Exim Maintainers 2019
9 /* Portions Copyright (c) 2012, 2013, The Trusted Domain Project;
10 All rights reserved, licensed for use per LICENSE.opendmarc. */
12 /* Code for calling dmarc checks via libopendmarc. Called from acl.c. */
15 #ifdef EXPERIMENTAL_DMARC
16 # if !defined SUPPORT_SPF
17 # error SPF must also be enabled for DMARC
18 # elif defined DISABLE_DKIM
19 # error DKIM must also be enabled for DMARC
22 # include "functions.h"
24 # include "pdkim/pdkim.h"
26 OPENDMARC_LIB_T dmarc_ctx
;
27 DMARC_POLICY_T
*dmarc_pctx
= NULL
;
28 OPENDMARC_STATUS_T libdm_status
, action
, dmarc_policy
;
29 OPENDMARC_STATUS_T da
, sa
, action
;
30 BOOL dmarc_abort
= FALSE
;
31 uschar
*dmarc_pass_fail
= US
"skipped";
32 header_line
*from_header
= NULL
;
33 extern SPF_response_t
*spf_response
;
34 int dmarc_spf_ares_result
= 0;
35 uschar
*spf_sender_domain
= NULL
;
36 uschar
*spf_human_readable
= NULL
;
37 u_char
*header_from_sender
= NULL
;
38 int history_file_status
= DMARC_HIST_OK
;
39 uschar
*dkim_history_buffer
= NULL
;
41 typedef struct dmarc_exim_p
{
46 static dmarc_exim_p dmarc_policy_description
[] = {
48 { US
"", DMARC_RECORD_P_UNSPECIFIED
},
49 { US
"none", DMARC_RECORD_P_NONE
},
50 { US
"quarantine", DMARC_RECORD_P_QUARANTINE
},
51 { US
"reject", DMARC_RECORD_P_REJECT
},
54 /* Accept an error_block struct, initialize if empty, parse to the
55 * end, and append the two strings passed to it. Used for adding
56 * variable amounts of value:pair data to the forensic emails. */
59 add_to_eblock(error_block
*eblock
, uschar
*t1
, uschar
*t2
)
61 error_block
*eb
= store_malloc(sizeof(error_block
));
66 /* Find the end of the eblock struct and point it at eb */
67 error_block
*tmp
= eblock
;
68 while(tmp
->next
!= NULL
)
78 /* dmarc_init sets up a context that can be re-used for several
79 messages on the same SMTP connection (that come from the
80 same host with the same HELO string) */
85 int *netmask
= NULL
; /* Ignored */
88 /* Set some sane defaults. Also clears previous results when
89 * multiple messages in one connection. */
91 dmarc_status
= US
"none";
93 dmarc_pass_fail
= US
"skipped";
94 dmarc_used_domain
= US
"";
95 f
.dmarc_has_been_checked
= FALSE
;
96 header_from_sender
= NULL
;
97 spf_sender_domain
= NULL
;
98 spf_human_readable
= NULL
;
100 /* ACLs have "control=dmarc_disable_verify" */
101 if (f
.dmarc_disable_verify
== TRUE
)
104 (void) memset(&dmarc_ctx
, '\0', sizeof dmarc_ctx
);
105 dmarc_ctx
.nscount
= 0;
106 libdm_status
= opendmarc_policy_library_init(&dmarc_ctx
);
107 if (libdm_status
!= DMARC_PARSE_OKAY
)
109 log_write(0, LOG_MAIN
|LOG_PANIC
, "DMARC failure to init library: %s",
110 opendmarc_policy_status_to_str(libdm_status
));
113 if (!dmarc_tld_file
|| !*dmarc_tld_file
)
115 DEBUG(D_receive
) debug_printf("DMARC: no dmarc_tld_file\n");
118 else if (opendmarc_tld_read_file(CS dmarc_tld_file
, NULL
, NULL
, NULL
))
120 log_write(0, LOG_MAIN
|LOG_PANIC
, "DMARC failure to load tld list '%s': %s",
121 dmarc_tld_file
, strerror(errno
));
124 if (!sender_host_address
)
126 DEBUG(D_receive
) debug_printf("DMARC: no sender_host_address\n");
129 /* This catches locally originated email and startup errors above. */
132 is_ipv6
= string_is_ip_address(sender_host_address
, netmask
) == 6;
133 if (!(dmarc_pctx
= opendmarc_policy_connect_init(sender_host_address
, is_ipv6
)))
135 log_write(0, LOG_MAIN
|LOG_PANIC
,
136 "DMARC failure creating policy context: ip=%s", sender_host_address
);
145 /* dmarc_store_data stores the header data so that subsequent
146 dmarc_process can access the data */
149 dmarc_store_data(header_line
*hdr
)
151 /* No debug output because would change every test debug output */
152 if (!f
.dmarc_disable_verify
)
159 dmarc_send_forensic_report(u_char
**ruf
)
161 uschar
*recipient
, *save_sender
;
162 BOOL send_status
= FALSE
;
163 error_block
*eblock
= NULL
;
164 FILE *message_file
= NULL
;
166 /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
167 if (!f
.dmarc_enable_forensic
)
170 if ( dmarc_policy
== DMARC_POLICY_REJECT
&& action
== DMARC_RESULT_REJECT
171 || dmarc_policy
== DMARC_POLICY_QUARANTINE
&& action
== DMARC_RESULT_QUARANTINE
172 || dmarc_policy
== DMARC_POLICY_NONE
&& action
== DMARC_RESULT_REJECT
173 || dmarc_policy
== DMARC_POLICY_NONE
&& action
== DMARC_RESULT_QUARANTINE
177 eblock
= add_to_eblock(eblock
, US
"Sender Domain", dmarc_used_domain
);
178 eblock
= add_to_eblock(eblock
, US
"Sender IP Address", sender_host_address
);
179 eblock
= add_to_eblock(eblock
, US
"Received Date", tod_stamp(tod_full
));
180 eblock
= add_to_eblock(eblock
, US
"SPF Alignment",
181 sa
== DMARC_POLICY_SPF_ALIGNMENT_PASS
? US
"yes" : US
"no");
182 eblock
= add_to_eblock(eblock
, US
"DKIM Alignment",
183 da
== DMARC_POLICY_DKIM_ALIGNMENT_PASS
? US
"yes" : US
"no");
184 eblock
= add_to_eblock(eblock
, US
"DMARC Results", dmarc_status_text
);
186 for (int c
= 0; ruf
[c
]; c
++)
188 recipient
= string_copylc(ruf
[c
]);
189 if (Ustrncmp(recipient
, "mailto:",7))
191 /* Move to first character past the colon */
194 debug_printf("DMARC forensic report to %s%s\n", recipient
,
195 (host_checking
|| f
.running_in_test_harness
) ? " (not really)" : "");
196 if (host_checking
|| f
.running_in_test_harness
)
199 if (!moan_send_message(recipient
, ERRMESS_DMARC_FORENSIC
, eblock
,
200 header_list
, message_file
, NULL
))
201 log_write(0, LOG_MAIN
|LOG_PANIC
,
202 "failure to send DMARC forensic report to %s", recipient
);
208 /* Look up a DNS dmarc record for the given domain. Return it or NULL */
211 dmarc_dns_lookup(uschar
* dom
)
213 dns_answer
* dnsa
= store_get_dns_answer();
215 int rc
= dns_lookup(dnsa
, string_sprintf("_dmarc.%s", dom
), T_TXT
, NULL
);
217 if (rc
== DNS_SUCCEED
)
218 for (dns_record
* rr
= dns_next_rr(dnsa
, &dnss
, RESET_ANSWERS
); rr
;
219 rr
= dns_next_rr(dnsa
, &dnss
, RESET_NEXT
))
220 if (rr
->type
== T_TXT
&& rr
->size
> 3)
221 return string_copyn(US rr
->data
, rr
->size
);
226 /* dmarc_process adds the envelope sender address to the existing
227 context (if any), retrieves the result, sets up expansion
228 strings and evaluates the condition outcome. */
233 int sr
, origin
; /* used in SPF section */
234 int dmarc_spf_result
= 0; /* stores spf into dmarc conn ctx */
236 pdkim_signature
* sig
= dkim_signatures
;
238 BOOL has_dmarc_record
= TRUE
;
239 u_char
**ruf
; /* forensic report addressees, if called for */
241 /* ACLs have "control=dmarc_disable_verify" */
242 if (f
.dmarc_disable_verify
)
245 /* Store the header From: sender domain for this part of DMARC.
246 * If there is no from_header struct, then it's likely this message
247 * is locally generated and relying on fixups to add it. Just skip
248 * the entire DMARC system if we can't find a From: header....or if
249 * there was a previous error.
253 DEBUG(D_receive
) debug_printf("DMARC: no From: header\n");
256 else if (!dmarc_abort
)
263 f
.parse_allow_group
= TRUE
;
264 p
= parse_find_address_end(from_header
->text
, FALSE
);
265 saveend
= *p
; *p
= '\0';
266 if ((header_from_sender
= parse_extract_address(from_header
->text
, &errormsg
,
267 &dummy
, &dummy
, &domain
, FALSE
)))
268 header_from_sender
+= domain
;
271 /* The opendmarc library extracts the domain from the email address, but
272 * only try to store it if it's not empty. Otherwise, skip out of DMARC. */
273 if (!header_from_sender
|| (strcmp( CCS header_from_sender
, "") == 0))
275 libdm_status
= dmarc_abort
277 : opendmarc_policy_store_from_domain(dmarc_pctx
, header_from_sender
);
278 if (libdm_status
!= DMARC_PARSE_OKAY
)
280 log_write(0, LOG_MAIN
|LOG_PANIC
,
281 "failure to store header From: in DMARC: %s, header was '%s'",
282 opendmarc_policy_status_to_str(libdm_status
), from_header
->text
);
287 /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
288 * instead do this in the ACLs. */
289 if (!dmarc_abort
&& !sender_host_authenticated
)
291 uschar
* dmarc_domain
;
293 /* Use the envelope sender domain for this part of DMARC */
294 spf_sender_domain
= expand_string(US
"$sender_address_domain");
297 /* No spf data means null envelope sender so generate a domain name
298 * from the sender_helo_name */
299 if (!spf_sender_domain
)
301 spf_sender_domain
= sender_helo_name
;
302 log_write(0, LOG_MAIN
, "DMARC using synthesized SPF sender domain = %s\n",
305 debug_printf("DMARC using synthesized SPF sender domain = %s\n",
308 dmarc_spf_result
= DMARC_POLICY_SPF_OUTCOME_NONE
;
309 dmarc_spf_ares_result
= ARES_RESULT_UNKNOWN
;
310 origin
= DMARC_POLICY_SPF_ORIGIN_HELO
;
311 spf_human_readable
= US
"";
315 sr
= spf_response
->result
;
316 dmarc_spf_result
= sr
== SPF_RESULT_NEUTRAL
? DMARC_POLICY_SPF_OUTCOME_NONE
:
317 sr
== SPF_RESULT_PASS
? DMARC_POLICY_SPF_OUTCOME_PASS
:
318 sr
== SPF_RESULT_FAIL
? DMARC_POLICY_SPF_OUTCOME_FAIL
:
319 sr
== SPF_RESULT_SOFTFAIL
? DMARC_POLICY_SPF_OUTCOME_TMPFAIL
:
320 DMARC_POLICY_SPF_OUTCOME_NONE
;
321 dmarc_spf_ares_result
= sr
== SPF_RESULT_NEUTRAL
? ARES_RESULT_NEUTRAL
:
322 sr
== SPF_RESULT_PASS
? ARES_RESULT_PASS
:
323 sr
== SPF_RESULT_FAIL
? ARES_RESULT_FAIL
:
324 sr
== SPF_RESULT_SOFTFAIL
? ARES_RESULT_SOFTFAIL
:
325 sr
== SPF_RESULT_NONE
? ARES_RESULT_NONE
:
326 sr
== SPF_RESULT_TEMPERROR
? ARES_RESULT_TEMPERROR
:
327 sr
== SPF_RESULT_PERMERROR
? ARES_RESULT_PERMERROR
:
329 origin
= DMARC_POLICY_SPF_ORIGIN_MAILFROM
;
330 spf_human_readable
= US spf_response
->header_comment
;
332 debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain
);
334 if (strcmp( CCS spf_sender_domain
, "") == 0)
338 libdm_status
= opendmarc_policy_store_spf(dmarc_pctx
, spf_sender_domain
,
339 dmarc_spf_result
, origin
, spf_human_readable
);
340 if (libdm_status
!= DMARC_PARSE_OKAY
)
341 log_write(0, LOG_MAIN
|LOG_PANIC
, "failure to store spf for DMARC: %s",
342 opendmarc_policy_status_to_str(libdm_status
));
345 /* Now we cycle through the dkim signature results and put into
346 * the opendmarc context, further building the DMARC reply. */
347 dkim_history_buffer
= US
"";
350 int dkim_result
, dkim_ares_result
, vs
, ves
;
352 vs
= sig
->verify_status
& ~PDKIM_VERIFY_POLICY
;
353 ves
= sig
->verify_ext_status
;
354 dkim_result
= vs
== PDKIM_VERIFY_PASS
? DMARC_POLICY_DKIM_OUTCOME_PASS
:
355 vs
== PDKIM_VERIFY_FAIL
? DMARC_POLICY_DKIM_OUTCOME_FAIL
:
356 vs
== PDKIM_VERIFY_INVALID
? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL
:
357 DMARC_POLICY_DKIM_OUTCOME_NONE
;
358 libdm_status
= opendmarc_policy_store_dkim(dmarc_pctx
, US sig
->domain
,
361 debug_printf("DMARC adding DKIM sender domain = %s\n", sig
->domain
);
362 if (libdm_status
!= DMARC_PARSE_OKAY
)
363 log_write(0, LOG_MAIN
|LOG_PANIC
,
364 "failure to store dkim (%s) for DMARC: %s",
365 sig
->domain
, opendmarc_policy_status_to_str(libdm_status
));
368 vs
== PDKIM_VERIFY_PASS
? ARES_RESULT_PASS
:
369 vs
== PDKIM_VERIFY_FAIL
? ARES_RESULT_FAIL
:
370 vs
== PDKIM_VERIFY_NONE
? ARES_RESULT_NONE
:
371 vs
== PDKIM_VERIFY_INVALID
?
372 ves
== PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE
? ARES_RESULT_PERMERROR
:
373 ves
== PDKIM_VERIFY_INVALID_BUFFER_SIZE
? ARES_RESULT_PERMERROR
:
374 ves
== PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD
? ARES_RESULT_PERMERROR
:
375 ves
== PDKIM_VERIFY_INVALID_PUBKEY_IMPORT
? ARES_RESULT_PERMERROR
:
376 ARES_RESULT_UNKNOWN
:
378 dkim_history_buffer
= string_sprintf("%sdkim %s %d\n", dkim_history_buffer
,
379 sig
->domain
, dkim_ares_result
);
383 /* Look up DMARC policy record in DNS. We do this explicitly, rather than
384 letting the dmarc library do it with opendmarc_policy_query_dmarc(), so that
385 our dns access path is used for debug tracing and for the testsuite
388 libdm_status
= (rr
= dmarc_dns_lookup(header_from_sender
))
389 ? opendmarc_policy_store_dmarc(dmarc_pctx
, rr
, header_from_sender
, NULL
)
390 : DMARC_DNS_ERROR_NO_RECORD
;
391 switch (libdm_status
)
393 case DMARC_DNS_ERROR_NXDOMAIN
:
394 case DMARC_DNS_ERROR_NO_RECORD
:
396 debug_printf("DMARC no record found for %s\n", header_from_sender
);
397 has_dmarc_record
= FALSE
;
399 case DMARC_PARSE_OKAY
:
401 debug_printf("DMARC record found for %s\n", header_from_sender
);
403 case DMARC_PARSE_ERROR_BAD_VALUE
:
405 debug_printf("DMARC record parse error for %s\n", header_from_sender
);
406 has_dmarc_record
= FALSE
;
409 /* everything else, skip dmarc */
411 debug_printf("DMARC skipping (%d), unsure what to do with %s",
412 libdm_status
, from_header
->text
);
413 has_dmarc_record
= FALSE
;
417 /* Store the policy string in an expandable variable. */
419 libdm_status
= opendmarc_policy_fetch_p(dmarc_pctx
, &tmp_ans
);
420 for (c
= 0; dmarc_policy_description
[c
].name
; c
++)
421 if (tmp_ans
== dmarc_policy_description
[c
].value
)
423 dmarc_domain_policy
= string_sprintf("%s",dmarc_policy_description
[c
].name
);
427 /* Can't use exim's string manipulation functions so allocate memory
428 for libopendmarc using its max hostname length definition. */
430 dmarc_domain
= store_get(DMARC_MAXHOSTNAMELEN
, TRUE
);
431 libdm_status
= opendmarc_policy_fetch_utilized_domain(dmarc_pctx
,
432 dmarc_domain
, DMARC_MAXHOSTNAMELEN
-1);
433 store_release_above(dmarc_domain
+ Ustrlen(dmarc_domain
)+1);
434 dmarc_used_domain
= dmarc_domain
;
436 if (libdm_status
!= DMARC_PARSE_OKAY
)
437 log_write(0, LOG_MAIN
|LOG_PANIC
,
438 "failure to read domainname used for DMARC lookup: %s",
439 opendmarc_policy_status_to_str(libdm_status
));
441 dmarc_policy
= libdm_status
= opendmarc_get_policy_to_enforce(dmarc_pctx
);
444 case DMARC_POLICY_ABSENT
: /* No DMARC record found */
445 dmarc_status
= US
"norecord";
446 dmarc_pass_fail
= US
"none";
447 dmarc_status_text
= US
"No DMARC record";
448 action
= DMARC_RESULT_ACCEPT
;
450 case DMARC_FROM_DOMAIN_ABSENT
: /* No From: domain */
451 dmarc_status
= US
"nofrom";
452 dmarc_pass_fail
= US
"temperror";
453 dmarc_status_text
= US
"No From: domain found";
454 action
= DMARC_RESULT_ACCEPT
;
456 case DMARC_POLICY_NONE
: /* Accept and report */
457 dmarc_status
= US
"none";
458 dmarc_pass_fail
= US
"none";
459 dmarc_status_text
= US
"None, Accept";
460 action
= DMARC_RESULT_ACCEPT
;
462 case DMARC_POLICY_PASS
: /* Explicit accept */
463 dmarc_status
= US
"accept";
464 dmarc_pass_fail
= US
"pass";
465 dmarc_status_text
= US
"Accept";
466 action
= DMARC_RESULT_ACCEPT
;
468 case DMARC_POLICY_REJECT
: /* Explicit reject */
469 dmarc_status
= US
"reject";
470 dmarc_pass_fail
= US
"fail";
471 dmarc_status_text
= US
"Reject";
472 action
= DMARC_RESULT_REJECT
;
474 case DMARC_POLICY_QUARANTINE
: /* Explicit quarantine */
475 dmarc_status
= US
"quarantine";
476 dmarc_pass_fail
= US
"fail";
477 dmarc_status_text
= US
"Quarantine";
478 action
= DMARC_RESULT_QUARANTINE
;
481 dmarc_status
= US
"temperror";
482 dmarc_pass_fail
= US
"temperror";
483 dmarc_status_text
= US
"Internal Policy Error";
484 action
= DMARC_RESULT_TEMPFAIL
;
488 libdm_status
= opendmarc_policy_fetch_alignment(dmarc_pctx
, &da
, &sa
);
489 if (libdm_status
!= DMARC_PARSE_OKAY
)
490 log_write(0, LOG_MAIN
|LOG_PANIC
, "failure to read DMARC alignment: %s",
491 opendmarc_policy_status_to_str(libdm_status
));
493 if (has_dmarc_record
)
495 log_write(0, LOG_MAIN
, "DMARC results: spf_domain=%s dmarc_domain=%s "
496 "spf_align=%s dkim_align=%s enforcement='%s'",
497 spf_sender_domain
, dmarc_used_domain
,
498 sa
==DMARC_POLICY_SPF_ALIGNMENT_PASS
?"yes":"no",
499 da
==DMARC_POLICY_DKIM_ALIGNMENT_PASS
?"yes":"no",
501 history_file_status
= dmarc_write_history_file();
502 /* Now get the forensic reporting addresses, if any */
503 ruf
= opendmarc_policy_fetch_ruf(dmarc_pctx
, NULL
, 0, 1);
504 dmarc_send_forensic_report(ruf
);
508 /* shut down libopendmarc */
510 (void) opendmarc_policy_connect_shutdown(dmarc_pctx
);
511 if (!f
.dmarc_disable_verify
)
512 (void) opendmarc_policy_library_shutdown(&dmarc_ctx
);
518 dmarc_write_history_file()
523 u_char
**rua
; /* aggregate report addressees */
524 uschar
*history_buffer
= NULL
;
526 if (!dmarc_history_file
)
528 DEBUG(D_receive
) debug_printf("DMARC history file not set\n");
529 return DMARC_HIST_DISABLED
;
531 history_file_fd
= log_create(dmarc_history_file
);
533 if (history_file_fd
< 0)
535 log_write(0, LOG_MAIN
|LOG_PANIC
, "failure to create DMARC history file: %s",
537 return DMARC_HIST_FILE_ERR
;
540 /* Generate the contents of the history file */
541 history_buffer
= string_sprintf(
542 "job %s\nreporter %s\nreceived %ld\nipaddr %s\nfrom %s\nmfrom %s\n",
543 message_id
, primary_hostname
, time(NULL
), sender_host_address
,
544 header_from_sender
, expand_string(US
"$sender_address_domain"));
547 history_buffer
= string_sprintf("%sspf %d\n", history_buffer
, dmarc_spf_ares_result
);
548 /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */
550 history_buffer
= string_sprintf(
551 "%s%spdomain %s\npolicy %d\n",
552 history_buffer
, dkim_history_buffer
, dmarc_used_domain
, dmarc_policy
);
554 if ((rua
= opendmarc_policy_fetch_rua(dmarc_pctx
, NULL
, 0, 1)))
555 for (tmp_ans
= 0; rua
[tmp_ans
]; tmp_ans
++)
556 history_buffer
= string_sprintf("%srua %s\n", history_buffer
, rua
[tmp_ans
]);
558 history_buffer
= string_sprintf("%srua -\n", history_buffer
);
560 opendmarc_policy_fetch_pct(dmarc_pctx
, &tmp_ans
);
561 history_buffer
= string_sprintf("%spct %d\n", history_buffer
, tmp_ans
);
563 opendmarc_policy_fetch_adkim(dmarc_pctx
, &tmp_ans
);
564 history_buffer
= string_sprintf("%sadkim %d\n", history_buffer
, tmp_ans
);
566 opendmarc_policy_fetch_aspf(dmarc_pctx
, &tmp_ans
);
567 history_buffer
= string_sprintf("%saspf %d\n", history_buffer
, tmp_ans
);
569 opendmarc_policy_fetch_p(dmarc_pctx
, &tmp_ans
);
570 history_buffer
= string_sprintf("%sp %d\n", history_buffer
, tmp_ans
);
572 opendmarc_policy_fetch_sp(dmarc_pctx
, &tmp_ans
);
573 history_buffer
= string_sprintf("%ssp %d\n", history_buffer
, tmp_ans
);
575 history_buffer
= string_sprintf(
576 "%salign_dkim %d\nalign_spf %d\naction %d\n",
577 history_buffer
, da
, sa
, action
);
579 /* Write the contents to the history file */
581 debug_printf("DMARC logging history data for opendmarc reporting%s\n",
582 (host_checking
|| f
.running_in_test_harness
) ? " (not really)" : "");
583 if (host_checking
|| f
.running_in_test_harness
)
586 debug_printf("DMARC history data for debugging:\n%s", history_buffer
);
590 written_len
= write_to_fd_buf(history_file_fd
,
592 Ustrlen(history_buffer
));
593 if (written_len
== 0)
595 log_write(0, LOG_MAIN
|LOG_PANIC
, "failure to write to DMARC history file: %s",
597 return DMARC_HIST_WRITE_ERR
;
599 (void)close(history_file_fd
);
601 return DMARC_HIST_OK
;
606 dmarc_exim_expand_query(int what
)
608 if (f
.dmarc_disable_verify
|| !dmarc_pctx
)
609 return dmarc_exim_expand_defaults(what
);
611 if (what
== DMARC_VERIFY_STATUS
)
617 dmarc_exim_expand_defaults(int what
)
619 if (what
== DMARC_VERIFY_STATUS
)
620 return f
.dmarc_disable_verify
? US
"off" : US
"none";
626 authres_dmarc(gstring
* g
)
628 if (f
.dmarc_has_been_checked
)
630 g
= string_append(g
, 2, US
";\n\tdmarc=", dmarc_pass_fail
);
631 if (header_from_sender
)
632 g
= string_append(g
, 2, US
" header.from=", header_from_sender
);
637 # endif /* SUPPORT_SPF */
638 #endif /* EXPERIMENTAL_DMARC */