Merge tag 'exim-4_82_1'
[exim.git] / src / src / dmarc.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4 /* Experimental DMARC support.
5 Copyright (c) Todd Lyons <tlyons@exim.org> 2012 - 2014
6 License: GPL */
7
8 /* Portions Copyright (c) 2012, 2013, The Trusted Domain Project;
9 All rights reserved, licensed for use per LICENSE.opendmarc. */
10
11 /* Code for calling dmarc checks via libopendmarc. Called from acl.c. */
12
13 #include "exim.h"
14 #ifdef EXPERIMENTAL_DMARC
15 #if !defined EXPERIMENTAL_SPF
16 #error SPF must also be enabled for DMARC
17 #elif defined DISABLE_DKIM
18 #error DKIM must also be enabled for DMARC
19 #else
20
21 #include "functions.h"
22 #include "dmarc.h"
23 #include "pdkim/pdkim.h"
24
25 OPENDMARC_LIB_T dmarc_ctx;
26 DMARC_POLICY_T *dmarc_pctx = NULL;
27 OPENDMARC_STATUS_T libdm_status, action, dmarc_policy;
28 OPENDMARC_STATUS_T da, sa, action;
29 BOOL dmarc_abort = FALSE;
30 uschar *dmarc_pass_fail = US"skipped";
31 extern pdkim_signature *dkim_signatures;
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;
40
41 typedef struct dmarc_exim_p {
42 uschar *name;
43 int value;
44 } dmarc_exim_p;
45
46 static dmarc_exim_p dmarc_policy_description[] = {
47 { US"", DMARC_RECORD_P_UNSPECIFIED },
48 { US"none", DMARC_RECORD_P_NONE },
49 { US"quarantine", DMARC_RECORD_P_QUARANTINE },
50 { US"reject", DMARC_RECORD_P_REJECT },
51 { NULL, 0 }
52 };
53 /* Accept an error_block struct, initialize if empty, parse to the
54 * end, and append the two strings passed to it. Used for adding
55 * variable amounts of value:pair data to the forensic emails. */
56
57 static error_block *
58 add_to_eblock(error_block *eblock, uschar *t1, uschar *t2)
59 {
60 error_block *eb = malloc(sizeof(error_block));
61 if (eblock == NULL)
62 eblock = eb;
63 else
64 {
65 /* Find the end of the eblock struct and point it at eb */
66 error_block *tmp = eblock;
67 while(tmp->next != NULL)
68 tmp = tmp->next;
69 tmp->next = eb;
70 }
71 eb->text1 = t1;
72 eb->text2 = t2;
73 eb->next = NULL;
74 return eblock;
75 }
76
77 /* dmarc_init sets up a context that can be re-used for several
78 messages on the same SMTP connection (that come from the
79 same host with the same HELO string) */
80
81 int dmarc_init()
82 {
83 int *netmask = NULL; /* Ignored */
84 int is_ipv6 = 0;
85 char *tld_file = (dmarc_tld_file == NULL) ?
86 "/etc/exim/opendmarc.tlds" :
87 (char *)dmarc_tld_file;
88
89 /* Set some sane defaults. Also clears previous results when
90 * multiple messages in one connection. */
91 dmarc_pctx = NULL;
92 dmarc_status = US"none";
93 dmarc_abort = FALSE;
94 dmarc_pass_fail = US"skipped";
95 dmarc_used_domain = US"";
96 dmarc_ar_header = NULL;
97 dmarc_has_been_checked = FALSE;
98 header_from_sender = NULL;
99 spf_sender_domain = NULL;
100 spf_human_readable = NULL;
101
102 /* ACLs have "control=dmarc_disable_verify" */
103 if (dmarc_disable_verify == TRUE)
104 return OK;
105
106 (void) memset(&dmarc_ctx, '\0', sizeof dmarc_ctx);
107 dmarc_ctx.nscount = 0;
108 libdm_status = opendmarc_policy_library_init(&dmarc_ctx);
109 if (libdm_status != DMARC_PARSE_OKAY)
110 {
111 log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to init library: %s",
112 opendmarc_policy_status_to_str(libdm_status));
113 dmarc_abort = TRUE;
114 }
115 if (dmarc_tld_file == NULL)
116 dmarc_abort = TRUE;
117 else if (opendmarc_tld_read_file(tld_file, NULL, NULL, NULL))
118 {
119 log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list %s: %d",
120 tld_file, errno);
121 dmarc_abort = TRUE;
122 }
123 if (sender_host_address == NULL)
124 dmarc_abort = TRUE;
125 /* This catches locally originated email and startup errors above. */
126 if ( dmarc_abort == FALSE )
127 {
128 is_ipv6 = string_is_ip_address(sender_host_address, netmask);
129 is_ipv6 = (is_ipv6 == 6) ? TRUE :
130 (is_ipv6 == 4) ? FALSE : FALSE;
131 dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6);
132 if (dmarc_pctx == NULL )
133 {
134 log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure creating policy context: ip=%s",
135 sender_host_address);
136 dmarc_abort = TRUE;
137 }
138 }
139
140 return OK;
141 }
142
143
144 /* dmarc_store_data stores the header data so that subsequent
145 * dmarc_process can access the data */
146
147 int dmarc_store_data(header_line *hdr) {
148 /* No debug output because would change every test debug output */
149 if (dmarc_disable_verify != TRUE)
150 from_header = hdr;
151 return OK;
152 }
153
154
155 /* dmarc_process adds the envelope sender address to the existing
156 context (if any), retrieves the result, sets up expansion
157 strings and evaluates the condition outcome. */
158
159 int dmarc_process() {
160 int sr, origin; /* used in SPF section */
161 int dmarc_spf_result = 0; /* stores spf into dmarc conn ctx */
162 int tmp_ans, c;
163 pdkim_signature *sig = NULL;
164 BOOL has_dmarc_record = TRUE;
165 u_char **ruf; /* forensic report addressees, if called for */
166
167 /* ACLs have "control=dmarc_disable_verify" */
168 if (dmarc_disable_verify == TRUE)
169 {
170 dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
171 return OK;
172 }
173
174 /* Store the header From: sender domain for this part of DMARC.
175 * If there is no from_header struct, then it's likely this message
176 * is locally generated and relying on fixups to add it. Just skip
177 * the entire DMARC system if we can't find a From: header....or if
178 * there was a previous error.
179 */
180 if (from_header == NULL || dmarc_abort == TRUE)
181 dmarc_abort = TRUE;
182 else
183 {
184 uschar * errormsg;
185 int dummy, domain;
186 uschar * p;
187 uschar saveend;
188
189 parse_allow_group = TRUE;
190 p = parse_find_address_end(from_header->text, FALSE);
191 saveend = *p; *p = '\0';
192 if ((header_from_sender = parse_extract_address(from_header->text, &errormsg,
193 &dummy, &dummy, &domain, FALSE)))
194 header_from_sender += domain;
195 *p = saveend;
196
197 /* The opendmarc library extracts the domain from the email address, but
198 * only try to store it if it's not empty. Otherwise, skip out of DMARC. */
199 if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0))
200 dmarc_abort = TRUE;
201 libdm_status = dmarc_abort ?
202 DMARC_PARSE_OKAY :
203 opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
204 if (libdm_status != DMARC_PARSE_OKAY)
205 {
206 log_write(0, LOG_MAIN|LOG_PANIC,
207 "failure to store header From: in DMARC: %s, header was '%s'",
208 opendmarc_policy_status_to_str(libdm_status), from_header->text);
209 dmarc_abort = TRUE;
210 }
211 }
212
213 /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
214 * instead do this in the ACLs. */
215 if (dmarc_abort == FALSE && sender_host_authenticated == NULL)
216 {
217 /* Use the envelope sender domain for this part of DMARC */
218 spf_sender_domain = expand_string(US"$sender_address_domain");
219 if ( spf_response == NULL )
220 {
221 /* No spf data means null envelope sender so generate a domain name
222 * from the sender_helo_name */
223 if (spf_sender_domain == NULL)
224 {
225 spf_sender_domain = sender_helo_name;
226 log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n",
227 spf_sender_domain);
228 DEBUG(D_receive)
229 debug_printf("DMARC using synthesized SPF sender domain = %s\n", spf_sender_domain);
230 }
231 dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE;
232 dmarc_spf_ares_result = ARES_RESULT_UNKNOWN;
233 origin = DMARC_POLICY_SPF_ORIGIN_HELO;
234 spf_human_readable = US"";
235 }
236 else
237 {
238 sr = spf_response->result;
239 dmarc_spf_result = (sr == SPF_RESULT_NEUTRAL) ? DMARC_POLICY_SPF_OUTCOME_NONE :
240 (sr == SPF_RESULT_PASS) ? DMARC_POLICY_SPF_OUTCOME_PASS :
241 (sr == SPF_RESULT_FAIL) ? DMARC_POLICY_SPF_OUTCOME_FAIL :
242 (sr == SPF_RESULT_SOFTFAIL) ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL :
243 DMARC_POLICY_SPF_OUTCOME_NONE;
244 dmarc_spf_ares_result = (sr == SPF_RESULT_NEUTRAL) ? ARES_RESULT_NEUTRAL :
245 (sr == SPF_RESULT_PASS) ? ARES_RESULT_PASS :
246 (sr == SPF_RESULT_FAIL) ? ARES_RESULT_FAIL :
247 (sr == SPF_RESULT_SOFTFAIL) ? ARES_RESULT_SOFTFAIL :
248 (sr == SPF_RESULT_NONE) ? ARES_RESULT_NONE :
249 (sr == SPF_RESULT_TEMPERROR) ? ARES_RESULT_TEMPERROR :
250 (sr == SPF_RESULT_PERMERROR) ? ARES_RESULT_PERMERROR :
251 ARES_RESULT_UNKNOWN;
252 origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM;
253 spf_human_readable = (uschar *)spf_response->header_comment;
254 DEBUG(D_receive)
255 debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain);
256 }
257 if (strcmp( CCS spf_sender_domain, "") == 0)
258 dmarc_abort = TRUE;
259 if (dmarc_abort == FALSE)
260 {
261 libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain,
262 dmarc_spf_result, origin, spf_human_readable);
263 if (libdm_status != DMARC_PARSE_OKAY)
264 log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s",
265 opendmarc_policy_status_to_str(libdm_status));
266 }
267
268 /* Now we cycle through the dkim signature results and put into
269 * the opendmarc context, further building the DMARC reply. */
270 sig = dkim_signatures;
271 dkim_history_buffer = US"";
272 while (sig != NULL)
273 {
274 int dkim_result, dkim_ares_result, vs, ves;
275 vs = sig->verify_status;
276 ves = sig->verify_ext_status;
277 dkim_result = ( vs == PDKIM_VERIFY_PASS ) ? DMARC_POLICY_DKIM_OUTCOME_PASS :
278 ( vs == PDKIM_VERIFY_FAIL ) ? DMARC_POLICY_DKIM_OUTCOME_FAIL :
279 ( vs == PDKIM_VERIFY_INVALID ) ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
280 DMARC_POLICY_DKIM_OUTCOME_NONE;
281 libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, (uschar *)sig->domain,
282 dkim_result, US"");
283 DEBUG(D_receive)
284 debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
285 if (libdm_status != DMARC_PARSE_OKAY)
286 log_write(0, LOG_MAIN|LOG_PANIC, "failure to store dkim (%s) for DMARC: %s",
287 sig->domain, opendmarc_policy_status_to_str(libdm_status));
288
289 dkim_ares_result = ( vs == PDKIM_VERIFY_PASS ) ? ARES_RESULT_PASS :
290 ( vs == PDKIM_VERIFY_FAIL ) ? ARES_RESULT_FAIL :
291 ( vs == PDKIM_VERIFY_NONE ) ? ARES_RESULT_NONE :
292 ( vs == PDKIM_VERIFY_INVALID ) ?
293 ( ves == PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE ? ARES_RESULT_PERMERROR :
294 ves == PDKIM_VERIFY_INVALID_BUFFER_SIZE ? ARES_RESULT_PERMERROR :
295 ves == PDKIM_VERIFY_INVALID_PUBKEY_PARSING ? ARES_RESULT_PERMERROR :
296 ARES_RESULT_UNKNOWN ) :
297 ARES_RESULT_UNKNOWN;
298 dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
299 sig->domain, dkim_ares_result);
300 sig = sig->next;
301 }
302 libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US"");
303 switch (libdm_status)
304 {
305 case DMARC_DNS_ERROR_NXDOMAIN:
306 case DMARC_DNS_ERROR_NO_RECORD:
307 DEBUG(D_receive)
308 debug_printf("DMARC no record found for %s\n", header_from_sender);
309 has_dmarc_record = FALSE;
310 break;
311 case DMARC_PARSE_OKAY:
312 DEBUG(D_receive)
313 debug_printf("DMARC record found for %s\n", header_from_sender);
314 break;
315 case DMARC_PARSE_ERROR_BAD_VALUE:
316 DEBUG(D_receive)
317 debug_printf("DMARC record parse error for %s\n", header_from_sender);
318 has_dmarc_record = FALSE;
319 break;
320 default:
321 /* everything else, skip dmarc */
322 DEBUG(D_receive)
323 debug_printf("DMARC skipping (%d), unsure what to do with %s",
324 libdm_status, from_header->text);
325 has_dmarc_record = FALSE;
326 break;
327 }
328
329 /* Store the policy string in an expandable variable. */
330 libdm_status = opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
331 for (c=0; dmarc_policy_description[c].name != NULL; c++) {
332 if (tmp_ans == dmarc_policy_description[c].value) {
333 dmarc_domain_policy = string_sprintf("%s",dmarc_policy_description[c].name);
334 break;
335 }
336 }
337
338 /* Can't use exim's string manipulation functions so allocate memory
339 * for libopendmarc using its max hostname length definition. */
340 uschar *dmarc_domain = (uschar *)calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar));
341 libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx, dmarc_domain,
342 DMARC_MAXHOSTNAMELEN-1);
343 dmarc_used_domain = string_copy(dmarc_domain);
344 free(dmarc_domain);
345 if (libdm_status != DMARC_PARSE_OKAY)
346 {
347 log_write(0, LOG_MAIN|LOG_PANIC, "failure to read domainname used for DMARC lookup: %s",
348 opendmarc_policy_status_to_str(libdm_status));
349 }
350 libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
351 dmarc_policy = libdm_status;
352 switch(libdm_status)
353 {
354 case DMARC_POLICY_ABSENT: /* No DMARC record found */
355 dmarc_status = US"norecord";
356 dmarc_pass_fail = US"none";
357 dmarc_status_text = US"No DMARC record";
358 action = DMARC_RESULT_ACCEPT;
359 break;
360 case DMARC_FROM_DOMAIN_ABSENT: /* No From: domain */
361 dmarc_status = US"nofrom";
362 dmarc_pass_fail = US"temperror";
363 dmarc_status_text = US"No From: domain found";
364 action = DMARC_RESULT_ACCEPT;
365 break;
366 case DMARC_POLICY_NONE: /* Accept and report */
367 dmarc_status = US"none";
368 dmarc_pass_fail = US"none";
369 dmarc_status_text = US"None, Accept";
370 action = DMARC_RESULT_ACCEPT;
371 break;
372 case DMARC_POLICY_PASS: /* Explicit accept */
373 dmarc_status = US"accept";
374 dmarc_pass_fail = US"pass";
375 dmarc_status_text = US"Accept";
376 action = DMARC_RESULT_ACCEPT;
377 break;
378 case DMARC_POLICY_REJECT: /* Explicit reject */
379 dmarc_status = US"reject";
380 dmarc_pass_fail = US"fail";
381 dmarc_status_text = US"Reject";
382 action = DMARC_RESULT_REJECT;
383 break;
384 case DMARC_POLICY_QUARANTINE: /* Explicit quarantine */
385 dmarc_status = US"quarantine";
386 dmarc_pass_fail = US"fail";
387 dmarc_status_text = US"Quarantine";
388 action = DMARC_RESULT_QUARANTINE;
389 break;
390 default:
391 dmarc_status = US"temperror";
392 dmarc_pass_fail = US"temperror";
393 dmarc_status_text = US"Internal Policy Error";
394 action = DMARC_RESULT_TEMPFAIL;
395 break;
396 }
397
398 libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
399 if (libdm_status != DMARC_PARSE_OKAY)
400 {
401 log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
402 opendmarc_policy_status_to_str(libdm_status));
403 }
404
405 if (has_dmarc_record == TRUE)
406 {
407 log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
408 "spf_align=%s dkim_align=%s enforcement='%s'",
409 spf_sender_domain, dmarc_used_domain,
410 (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?"yes":"no",
411 (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?"yes":"no",
412 dmarc_status_text);
413 history_file_status = dmarc_write_history_file();
414 /* Now get the forensic reporting addresses, if any */
415 ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
416 dmarc_send_forensic_report(ruf);
417 }
418 }
419
420 /* set some global variables here */
421 dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
422
423 /* shut down libopendmarc */
424 if ( dmarc_pctx != NULL )
425 (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
426 if ( dmarc_disable_verify == FALSE )
427 (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
428
429 return OK;
430 }
431
432 int dmarc_write_history_file()
433 {
434 int history_file_fd;
435 ssize_t written_len;
436 int tmp_ans;
437 u_char **rua; /* aggregate report addressees */
438 uschar *history_buffer = NULL;
439
440 if (dmarc_history_file == NULL)
441 return DMARC_HIST_DISABLED;
442 history_file_fd = log_create(dmarc_history_file);
443
444 if (history_file_fd < 0)
445 {
446 log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
447 dmarc_history_file);
448 return DMARC_HIST_FILE_ERR;
449 }
450
451 /* Generate the contents of the history file */
452 history_buffer = string_sprintf("job %s\n", message_id);
453 history_buffer = string_sprintf("%sreporter %s\n", history_buffer, primary_hostname);
454 history_buffer = string_sprintf("%sreceived %ld\n", history_buffer, time(NULL));
455 history_buffer = string_sprintf("%sipaddr %s\n", history_buffer, sender_host_address);
456 history_buffer = string_sprintf("%sfrom %s\n", history_buffer, header_from_sender);
457 history_buffer = string_sprintf("%smfrom %s\n", history_buffer,
458 expand_string(US"$sender_address_domain"));
459
460 if (spf_response != NULL)
461 history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result);
462 /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */
463
464 history_buffer = string_sprintf("%s%s", history_buffer, dkim_history_buffer);
465 history_buffer = string_sprintf("%spdomain %s\n", history_buffer, dmarc_used_domain);
466 history_buffer = string_sprintf("%spolicy %d\n", history_buffer, dmarc_policy);
467
468 rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1);
469 if (rua != NULL)
470 {
471 for (tmp_ans = 0; rua[tmp_ans] != NULL; tmp_ans++)
472 {
473 history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
474 }
475 }
476 else
477 history_buffer = string_sprintf("%srua -\n", history_buffer);
478
479 opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
480 history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
481
482 opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
483 history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
484
485 opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
486 history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
487
488 opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
489 history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
490
491 opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
492 history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
493
494 history_buffer = string_sprintf("%salign_dkim %d\n", history_buffer, da);
495 history_buffer = string_sprintf("%salign_spf %d\n", history_buffer, sa);
496 history_buffer = string_sprintf("%saction %d\n", history_buffer, action);
497
498 /* Write the contents to the history file */
499 DEBUG(D_receive)
500 debug_printf("DMARC logging history data for opendmarc reporting%s\n",
501 (host_checking || running_in_test_harness) ? " (not really)" : "");
502 if (host_checking || running_in_test_harness)
503 {
504 DEBUG(D_receive)
505 debug_printf("DMARC history data for debugging:\n%s", history_buffer);
506 }
507 else
508 {
509 written_len = write_to_fd_buf(history_file_fd,
510 history_buffer,
511 Ustrlen(history_buffer));
512 if (written_len == 0)
513 {
514 log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
515 dmarc_history_file);
516 return DMARC_HIST_WRITE_ERR;
517 }
518 (void)close(history_file_fd);
519 }
520 return DMARC_HIST_OK;
521 }
522
523 void dmarc_send_forensic_report(u_char **ruf)
524 {
525 int c;
526 uschar *recipient, *save_sender;
527 BOOL send_status = FALSE;
528 error_block *eblock = NULL;
529 FILE *message_file = NULL;
530
531 /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
532 if (dmarc_enable_forensic == FALSE)
533 return;
534
535 if ((dmarc_policy == DMARC_POLICY_REJECT && action == DMARC_RESULT_REJECT) ||
536 (dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE) )
537 {
538 if (ruf != NULL)
539 {
540 eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
541 eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
542 eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
543 eblock = add_to_eblock(eblock, US"SPF Alignment",
544 (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no");
545 eblock = add_to_eblock(eblock, US"DKIM Alignment",
546 (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no");
547 eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
548 /* Set a sane default envelope sender */
549 dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender :
550 dsn_from ? dsn_from :
551 string_sprintf("do-not-reply@%s",primary_hostname);
552 for (c = 0; ruf[c] != NULL; c++)
553 {
554 recipient = string_copylc(ruf[c]);
555 if (Ustrncmp(recipient, "mailto:",7))
556 continue;
557 /* Move to first character past the colon */
558 recipient += 7;
559 DEBUG(D_receive)
560 debug_printf("DMARC forensic report to %s%s\n", recipient,
561 (host_checking || running_in_test_harness) ? " (not really)" : "");
562 if (host_checking || running_in_test_harness)
563 continue;
564 save_sender = sender_address;
565 sender_address = recipient;
566 send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock,
567 header_list, message_file, FALSE);
568 sender_address = save_sender;
569 if (send_status == FALSE)
570 log_write(0, LOG_MAIN|LOG_PANIC, "failure to send DMARC forensic report to %s",
571 recipient);
572 }
573 }
574 }
575 }
576
577 uschar *dmarc_exim_expand_query(int what)
578 {
579 if (dmarc_disable_verify || !dmarc_pctx)
580 return dmarc_exim_expand_defaults(what);
581
582 switch(what) {
583 case DMARC_VERIFY_STATUS:
584 return(dmarc_status);
585 default:
586 return US"";
587 }
588 }
589
590 uschar *dmarc_exim_expand_defaults(int what)
591 {
592 switch(what) {
593 case DMARC_VERIFY_STATUS:
594 return (dmarc_disable_verify) ?
595 US"off" :
596 US"none";
597 default:
598 return US"";
599 }
600 }
601
602 uschar *dmarc_auth_results_header(header_line *from_header, uschar *hostname)
603 {
604 uschar *hdr_tmp = US"";
605
606 /* Allow a server hostname to be passed to this function, but is
607 * currently unused */
608 if (hostname == NULL)
609 hostname = primary_hostname;
610 hdr_tmp = string_sprintf("%s %s;", DMARC_AR_HEADER, hostname);
611
612 #if 0
613 /* I don't think this belongs here, but left it here commented out
614 * because it was a lot of work to get working right. */
615 if (spf_response != NULL) {
616 uschar *dmarc_ar_spf = US"";
617 int sr = 0;
618 sr = spf_response->result;
619 dmarc_ar_spf = (sr == SPF_RESULT_NEUTRAL) ? US"neutral" :
620 (sr == SPF_RESULT_PASS) ? US"pass" :
621 (sr == SPF_RESULT_FAIL) ? US"fail" :
622 (sr == SPF_RESULT_SOFTFAIL) ? US"softfail" :
623 US"none";
624 hdr_tmp = string_sprintf("%s spf=%s (%s) smtp.mail=%s;",
625 hdr_tmp, dmarc_ar_spf_result,
626 spf_response->header_comment,
627 expand_string(US"$sender_address") );
628 }
629 #endif
630 hdr_tmp = string_sprintf("%s dmarc=%s",
631 hdr_tmp, dmarc_pass_fail);
632 if (header_from_sender)
633 hdr_tmp = string_sprintf("%s header.from=%s",
634 hdr_tmp, header_from_sender);
635 return hdr_tmp;
636 }
637
638 #endif /* EXPERIMENTAL_SPF */
639 #endif /* EXPERIMENTAL_DMARC */