Increase limit of smtp_confirmation logging from 100 to 256 chars. Bug 1408
[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 /* I strongly encourage anybody who can make this better to contact me directly!
185 * <cannonball> Is this an insane way to extract the email address from the From: header?
186 * <jgh_hm> it's sure a horrid layer-crossing....
187 * <cannonball> I'm not denying that :-/
188 * <jgh_hm> there may well be no better though
189 */
190 header_from_sender = expand_string(
191 string_sprintf("${domain:${extract{1}{:}{${addresses:\\N%s\\N}}}}",
192 from_header->text) );
193 /* The opendmarc library extracts the domain from the email address, but
194 * only try to store it if it's not empty. Otherwise, skip out of DMARC. */
195 if ((header_from_sender == NULL) || (strcmp( CCS header_from_sender, "") == 0))
196 dmarc_abort = TRUE;
197 libdm_status = (dmarc_abort == TRUE) ?
198 DMARC_PARSE_OKAY :
199 opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
200 if (libdm_status != DMARC_PARSE_OKAY)
201 {
202 log_write(0, LOG_MAIN|LOG_PANIC,
203 "failure to store header From: in DMARC: %s, header was '%s'",
204 opendmarc_policy_status_to_str(libdm_status), from_header->text);
205 dmarc_abort = TRUE;
206 }
207 }
208
209 /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
210 * instead do this in the ACLs. */
211 if (dmarc_abort == FALSE && sender_host_authenticated == NULL)
212 {
213 /* Use the envelope sender domain for this part of DMARC */
214 spf_sender_domain = expand_string(US"$sender_address_domain");
215 if ( spf_response == NULL )
216 {
217 /* No spf data means null envelope sender so generate a domain name
218 * from the sender_helo_name */
219 if (spf_sender_domain == NULL)
220 {
221 spf_sender_domain = sender_helo_name;
222 log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n",
223 spf_sender_domain);
224 DEBUG(D_receive)
225 debug_printf("DMARC using synthesized SPF sender domain = %s\n", spf_sender_domain);
226 }
227 dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE;
228 dmarc_spf_ares_result = ARES_RESULT_UNKNOWN;
229 origin = DMARC_POLICY_SPF_ORIGIN_HELO;
230 spf_human_readable = US"";
231 }
232 else
233 {
234 sr = spf_response->result;
235 dmarc_spf_result = (sr == SPF_RESULT_NEUTRAL) ? DMARC_POLICY_SPF_OUTCOME_NONE :
236 (sr == SPF_RESULT_PASS) ? DMARC_POLICY_SPF_OUTCOME_PASS :
237 (sr == SPF_RESULT_FAIL) ? DMARC_POLICY_SPF_OUTCOME_FAIL :
238 (sr == SPF_RESULT_SOFTFAIL) ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL :
239 DMARC_POLICY_SPF_OUTCOME_NONE;
240 dmarc_spf_ares_result = (sr == SPF_RESULT_NEUTRAL) ? ARES_RESULT_NEUTRAL :
241 (sr == SPF_RESULT_PASS) ? ARES_RESULT_PASS :
242 (sr == SPF_RESULT_FAIL) ? ARES_RESULT_FAIL :
243 (sr == SPF_RESULT_SOFTFAIL) ? ARES_RESULT_SOFTFAIL :
244 (sr == SPF_RESULT_NONE) ? ARES_RESULT_NONE :
245 (sr == SPF_RESULT_TEMPERROR) ? ARES_RESULT_TEMPERROR :
246 (sr == SPF_RESULT_PERMERROR) ? ARES_RESULT_PERMERROR :
247 ARES_RESULT_UNKNOWN;
248 origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM;
249 spf_human_readable = (uschar *)spf_response->header_comment;
250 DEBUG(D_receive)
251 debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain);
252 }
253 if (strcmp( CCS spf_sender_domain, "") == 0)
254 dmarc_abort = TRUE;
255 if (dmarc_abort == FALSE)
256 {
257 libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain,
258 dmarc_spf_result, origin, spf_human_readable);
259 if (libdm_status != DMARC_PARSE_OKAY)
260 log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s",
261 opendmarc_policy_status_to_str(libdm_status));
262 }
263
264 /* Now we cycle through the dkim signature results and put into
265 * the opendmarc context, further building the DMARC reply. */
266 sig = dkim_signatures;
267 dkim_history_buffer = US"";
268 while (sig != NULL)
269 {
270 int dkim_result, dkim_ares_result, vs, ves;
271 vs = sig->verify_status;
272 ves = sig->verify_ext_status;
273 dkim_result = ( vs == PDKIM_VERIFY_PASS ) ? DMARC_POLICY_DKIM_OUTCOME_PASS :
274 ( vs == PDKIM_VERIFY_FAIL ) ? DMARC_POLICY_DKIM_OUTCOME_FAIL :
275 ( vs == PDKIM_VERIFY_INVALID ) ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
276 DMARC_POLICY_DKIM_OUTCOME_NONE;
277 libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, (uschar *)sig->domain,
278 dkim_result, US"");
279 DEBUG(D_receive)
280 debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
281 if (libdm_status != DMARC_PARSE_OKAY)
282 log_write(0, LOG_MAIN|LOG_PANIC, "failure to store dkim (%s) for DMARC: %s",
283 sig->domain, opendmarc_policy_status_to_str(libdm_status));
284
285 dkim_ares_result = ( vs == PDKIM_VERIFY_PASS ) ? ARES_RESULT_PASS :
286 ( vs == PDKIM_VERIFY_FAIL ) ? ARES_RESULT_FAIL :
287 ( vs == PDKIM_VERIFY_NONE ) ? ARES_RESULT_NONE :
288 ( vs == PDKIM_VERIFY_INVALID ) ?
289 ( ves == PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE ? ARES_RESULT_PERMERROR :
290 ves == PDKIM_VERIFY_INVALID_BUFFER_SIZE ? ARES_RESULT_PERMERROR :
291 ves == PDKIM_VERIFY_INVALID_PUBKEY_PARSING ? ARES_RESULT_PERMERROR :
292 ARES_RESULT_UNKNOWN ) :
293 ARES_RESULT_UNKNOWN;
294 dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
295 sig->domain, dkim_ares_result);
296 sig = sig->next;
297 }
298 libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US"");
299 switch (libdm_status)
300 {
301 case DMARC_DNS_ERROR_NXDOMAIN:
302 case DMARC_DNS_ERROR_NO_RECORD:
303 DEBUG(D_receive)
304 debug_printf("DMARC no record found for %s\n", header_from_sender);
305 has_dmarc_record = FALSE;
306 break;
307 case DMARC_PARSE_OKAY:
308 DEBUG(D_receive)
309 debug_printf("DMARC record found for %s\n", header_from_sender);
310 break;
311 case DMARC_PARSE_ERROR_BAD_VALUE:
312 DEBUG(D_receive)
313 debug_printf("DMARC record parse error for %s\n", header_from_sender);
314 has_dmarc_record = FALSE;
315 break;
316 default:
317 /* everything else, skip dmarc */
318 DEBUG(D_receive)
319 debug_printf("DMARC skipping (%d), unsure what to do with %s",
320 libdm_status, from_header->text);
321 has_dmarc_record = FALSE;
322 break;
323 }
324
325 /* Store the policy string in an expandable variable. */
326 libdm_status = opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
327 for (c=0; dmarc_policy_description[c].name != NULL; c++) {
328 if (tmp_ans == dmarc_policy_description[c].value) {
329 dmarc_domain_policy = string_sprintf("%s",dmarc_policy_description[c].name);
330 break;
331 }
332 }
333
334 /* Can't use exim's string manipulation functions so allocate memory
335 * for libopendmarc using its max hostname length definition. */
336 uschar *dmarc_domain = (uschar *)calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar));
337 libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx, dmarc_domain,
338 DMARC_MAXHOSTNAMELEN-1);
339 dmarc_used_domain = string_copy(dmarc_domain);
340 free(dmarc_domain);
341 if (libdm_status != DMARC_PARSE_OKAY)
342 {
343 log_write(0, LOG_MAIN|LOG_PANIC, "failure to read domainname used for DMARC lookup: %s",
344 opendmarc_policy_status_to_str(libdm_status));
345 }
346 libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
347 dmarc_policy = libdm_status;
348 switch(libdm_status)
349 {
350 case DMARC_POLICY_ABSENT: /* No DMARC record found */
351 dmarc_status = US"norecord";
352 dmarc_pass_fail = US"none";
353 dmarc_status_text = US"No DMARC record";
354 action = DMARC_RESULT_ACCEPT;
355 break;
356 case DMARC_FROM_DOMAIN_ABSENT: /* No From: domain */
357 dmarc_status = US"nofrom";
358 dmarc_pass_fail = US"temperror";
359 dmarc_status_text = US"No From: domain found";
360 action = DMARC_RESULT_ACCEPT;
361 break;
362 case DMARC_POLICY_NONE: /* Accept and report */
363 dmarc_status = US"none";
364 dmarc_pass_fail = US"none";
365 dmarc_status_text = US"None, Accept";
366 action = DMARC_RESULT_ACCEPT;
367 break;
368 case DMARC_POLICY_PASS: /* Explicit accept */
369 dmarc_status = US"accept";
370 dmarc_pass_fail = US"pass";
371 dmarc_status_text = US"Accept";
372 action = DMARC_RESULT_ACCEPT;
373 break;
374 case DMARC_POLICY_REJECT: /* Explicit reject */
375 dmarc_status = US"reject";
376 dmarc_pass_fail = US"fail";
377 dmarc_status_text = US"Reject";
378 action = DMARC_RESULT_REJECT;
379 break;
380 case DMARC_POLICY_QUARANTINE: /* Explicit quarantine */
381 dmarc_status = US"quarantine";
382 dmarc_pass_fail = US"fail";
383 dmarc_status_text = US"Quarantine";
384 action = DMARC_RESULT_QUARANTINE;
385 break;
386 default:
387 dmarc_status = US"temperror";
388 dmarc_pass_fail = US"temperror";
389 dmarc_status_text = US"Internal Policy Error";
390 action = DMARC_RESULT_TEMPFAIL;
391 break;
392 }
393
394 libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
395 if (libdm_status != DMARC_PARSE_OKAY)
396 {
397 log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
398 opendmarc_policy_status_to_str(libdm_status));
399 }
400
401 if (has_dmarc_record == TRUE)
402 {
403 log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
404 "spf_align=%s dkim_align=%s enforcement='%s'",
405 spf_sender_domain, dmarc_used_domain,
406 (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?"yes":"no",
407 (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?"yes":"no",
408 dmarc_status_text);
409 history_file_status = dmarc_write_history_file();
410 /* Now get the forensic reporting addresses, if any */
411 ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
412 dmarc_send_forensic_report(ruf);
413 }
414 }
415
416 /* set some global variables here */
417 dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
418
419 /* shut down libopendmarc */
420 if ( dmarc_pctx != NULL )
421 (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
422 if ( dmarc_disable_verify == FALSE )
423 (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
424
425 return OK;
426 }
427
428 int dmarc_write_history_file()
429 {
430 int history_file_fd;
431 ssize_t written_len;
432 int tmp_ans;
433 u_char **rua; /* aggregate report addressees */
434 uschar *history_buffer = NULL;
435
436 if (dmarc_history_file == NULL)
437 return DMARC_HIST_DISABLED;
438 history_file_fd = log_create(dmarc_history_file);
439
440 if (history_file_fd < 0)
441 {
442 log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
443 dmarc_history_file);
444 return DMARC_HIST_FILE_ERR;
445 }
446
447 /* Generate the contents of the history file */
448 history_buffer = string_sprintf("job %s\n", message_id);
449 history_buffer = string_sprintf("%sreporter %s\n", history_buffer, primary_hostname);
450 history_buffer = string_sprintf("%sreceived %ld\n", history_buffer, time(NULL));
451 history_buffer = string_sprintf("%sipaddr %s\n", history_buffer, sender_host_address);
452 history_buffer = string_sprintf("%sfrom %s\n", history_buffer, header_from_sender);
453 history_buffer = string_sprintf("%smfrom %s\n", history_buffer,
454 expand_string(US"$sender_address_domain"));
455
456 if (spf_response != NULL)
457 history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result);
458 /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */
459
460 history_buffer = string_sprintf("%s%s", history_buffer, dkim_history_buffer);
461 history_buffer = string_sprintf("%spdomain %s\n", history_buffer, dmarc_used_domain);
462 history_buffer = string_sprintf("%spolicy %d\n", history_buffer, dmarc_policy);
463
464 rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1);
465 if (rua != NULL)
466 {
467 for (tmp_ans = 0; rua[tmp_ans] != NULL; tmp_ans++)
468 {
469 history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
470 }
471 }
472 else
473 history_buffer = string_sprintf("%srua -\n", history_buffer);
474
475 opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
476 history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
477
478 opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
479 history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
480
481 opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
482 history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
483
484 opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
485 history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
486
487 opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
488 history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
489
490 history_buffer = string_sprintf("%salign_dkim %d\n", history_buffer, da);
491 history_buffer = string_sprintf("%salign_spf %d\n", history_buffer, sa);
492 history_buffer = string_sprintf("%saction %d\n", history_buffer, action);
493
494 /* Write the contents to the history file */
495 DEBUG(D_receive)
496 debug_printf("DMARC logging history data for opendmarc reporting%s\n",
497 (host_checking || running_in_test_harness) ? " (not really)" : "");
498 if (host_checking || running_in_test_harness)
499 {
500 DEBUG(D_receive)
501 debug_printf("DMARC history data for debugging:\n%s", history_buffer);
502 }
503 else
504 {
505 written_len = write_to_fd_buf(history_file_fd,
506 history_buffer,
507 Ustrlen(history_buffer));
508 if (written_len == 0)
509 {
510 log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
511 dmarc_history_file);
512 return DMARC_HIST_WRITE_ERR;
513 }
514 (void)close(history_file_fd);
515 }
516 return DMARC_HIST_OK;
517 }
518
519 void dmarc_send_forensic_report(u_char **ruf)
520 {
521 int c;
522 uschar *recipient, *save_sender;
523 BOOL send_status = FALSE;
524 error_block *eblock = NULL;
525 FILE *message_file = NULL;
526
527 /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
528 if (dmarc_enable_forensic == FALSE)
529 return;
530
531 if ((dmarc_policy == DMARC_POLICY_REJECT && action == DMARC_RESULT_REJECT) ||
532 (dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE) )
533 {
534 if (ruf != NULL)
535 {
536 eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
537 eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
538 eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
539 eblock = add_to_eblock(eblock, US"SPF Alignment",
540 (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no");
541 eblock = add_to_eblock(eblock, US"DKIM Alignment",
542 (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no");
543 eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
544 /* Set a sane default envelope sender */
545 dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender :
546 dsn_from ? dsn_from :
547 string_sprintf("do-not-reply@%s",primary_hostname);
548 for (c = 0; ruf[c] != NULL; c++)
549 {
550 recipient = string_copylc(ruf[c]);
551 if (Ustrncmp(recipient, "mailto:",7))
552 continue;
553 /* Move to first character past the colon */
554 recipient += 7;
555 DEBUG(D_receive)
556 debug_printf("DMARC forensic report to %s%s\n", recipient,
557 (host_checking || running_in_test_harness) ? " (not really)" : "");
558 if (host_checking || running_in_test_harness)
559 continue;
560 save_sender = sender_address;
561 sender_address = recipient;
562 send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock,
563 header_list, message_file, FALSE);
564 sender_address = save_sender;
565 if (send_status == FALSE)
566 log_write(0, LOG_MAIN|LOG_PANIC, "failure to send DMARC forensic report to %s",
567 recipient);
568 }
569 }
570 }
571 }
572
573 uschar *dmarc_exim_expand_query(int what)
574 {
575 if (dmarc_disable_verify || !dmarc_pctx)
576 return dmarc_exim_expand_defaults(what);
577
578 switch(what) {
579 case DMARC_VERIFY_STATUS:
580 return(dmarc_status);
581 default:
582 return US"";
583 }
584 }
585
586 uschar *dmarc_exim_expand_defaults(int what)
587 {
588 switch(what) {
589 case DMARC_VERIFY_STATUS:
590 return (dmarc_disable_verify) ?
591 US"off" :
592 US"none";
593 default:
594 return US"";
595 }
596 }
597
598 uschar *dmarc_auth_results_header(header_line *from_header, uschar *hostname)
599 {
600 uschar *hdr_tmp = US"";
601
602 /* Allow a server hostname to be passed to this function, but is
603 * currently unused */
604 if (hostname == NULL)
605 hostname = primary_hostname;
606 hdr_tmp = string_sprintf("%s %s;", DMARC_AR_HEADER, hostname);
607
608 #if 0
609 /* I don't think this belongs here, but left it here commented out
610 * because it was a lot of work to get working right. */
611 if (spf_response != NULL) {
612 uschar *dmarc_ar_spf = US"";
613 int sr = 0;
614 sr = spf_response->result;
615 dmarc_ar_spf = (sr == SPF_RESULT_NEUTRAL) ? US"neutral" :
616 (sr == SPF_RESULT_PASS) ? US"pass" :
617 (sr == SPF_RESULT_FAIL) ? US"fail" :
618 (sr == SPF_RESULT_SOFTFAIL) ? US"softfail" :
619 US"none";
620 hdr_tmp = string_sprintf("%s spf=%s (%s) smtp.mail=%s;",
621 hdr_tmp, dmarc_ar_spf_result,
622 spf_response->header_comment,
623 expand_string(US"$sender_address") );
624 }
625 #endif
626 hdr_tmp = string_sprintf("%s dmarc=%s",
627 hdr_tmp, dmarc_pass_fail);
628 if (header_from_sender)
629 hdr_tmp = string_sprintf("%s header.from=%s",
630 hdr_tmp, header_from_sender);
631 return hdr_tmp;
632 }
633
634 #endif /* EXPERIMENTAL_SPF */
635 #endif /* EXPERIMENTAL_DMARC */