c6190613e928d7a9882636a3a07e320f80f65e96
[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, 2013
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 /* Accept an error_block struct, initialize if empty, parse to the
42 * end, and append the two strings passed to it. Used for adding
43 * variable amounts of value:pair data to the forensic emails. */
44
45 static error_block *
46 add_to_eblock(error_block *eblock, uschar *t1, uschar *t2)
47 {
48 error_block *eb = malloc(sizeof(error_block));
49 if (eblock == NULL)
50 eblock = eb;
51 else
52 {
53 /* Find the end of the eblock struct and point it at eb */
54 error_block *tmp = eblock;
55 while(tmp->next != NULL)
56 tmp = tmp->next;
57 tmp->next = eb;
58 }
59 eb->text1 = t1;
60 eb->text2 = t2;
61 eb->next = NULL;
62 return eblock;
63 }
64
65 /* dmarc_init sets up a context that can be re-used for several
66 messages on the same SMTP connection (that come from the
67 same host with the same HELO string) */
68
69 int dmarc_init()
70 {
71 int *netmask = NULL; /* Ignored */
72 int is_ipv6 = 0;
73 char *tld_file = (dmarc_tld_file == NULL) ?
74 "/etc/exim/opendmarc.tlds" :
75 (char *)dmarc_tld_file;
76
77 /* Set some sane defaults. Also clears previous results when
78 * multiple messages in one connection. */
79 dmarc_pctx = NULL;
80 dmarc_status = US"none";
81 dmarc_abort = FALSE;
82 dmarc_pass_fail = US"skipped";
83 dmarc_used_domain = US"";
84 dmarc_ar_header = NULL;
85 dmarc_has_been_checked = FALSE;
86 header_from_sender = NULL;
87 spf_sender_domain = NULL;
88 spf_human_readable = NULL;
89
90 /* ACLs have "control=dmarc_disable_verify" */
91 if (dmarc_disable_verify == TRUE)
92 return OK;
93
94 (void) memset(&dmarc_ctx, '\0', sizeof dmarc_ctx);
95 dmarc_ctx.nscount = 0;
96 libdm_status = opendmarc_policy_library_init(&dmarc_ctx);
97 if (libdm_status != DMARC_PARSE_OKAY)
98 {
99 log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to init library: %s",
100 opendmarc_policy_status_to_str(libdm_status));
101 dmarc_abort = TRUE;
102 }
103 if (dmarc_tld_file == NULL)
104 dmarc_abort = TRUE;
105 else if (opendmarc_tld_read_file(tld_file, NULL, NULL, NULL))
106 {
107 log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list %s: %d",
108 tld_file, errno);
109 dmarc_abort = TRUE;
110 }
111 if (sender_host_address == NULL)
112 dmarc_abort = TRUE;
113 /* This catches locally originated email and startup errors above. */
114 if ( dmarc_abort == FALSE )
115 {
116 is_ipv6 = string_is_ip_address(sender_host_address, netmask);
117 is_ipv6 = (is_ipv6 == 6) ? TRUE :
118 (is_ipv6 == 4) ? FALSE : FALSE;
119 dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6);
120 if (dmarc_pctx == NULL )
121 {
122 log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure creating policy context: ip=%s",
123 sender_host_address);
124 dmarc_abort = TRUE;
125 }
126 }
127
128 return OK;
129 }
130
131
132 /* dmarc_store_data stores the header data so that subsequent
133 * dmarc_process can access the data */
134
135 int dmarc_store_data(header_line *hdr) {
136 /* No debug output because would change every test debug output */
137 if (dmarc_disable_verify != TRUE)
138 from_header = hdr;
139 return OK;
140 }
141
142
143 /* dmarc_process adds the envelope sender address to the existing
144 context (if any), retrieves the result, sets up expansion
145 strings and evaluates the condition outcome. */
146
147 int dmarc_process() {
148 int sr, origin; /* used in SPF section */
149 int dmarc_spf_result = 0; /* stores spf into dmarc conn ctx */
150 pdkim_signature *sig = NULL;
151 BOOL has_dmarc_record = TRUE;
152 u_char **ruf; /* forensic report addressees, if called for */
153
154 /* ACLs have "control=dmarc_disable_verify" */
155 if (dmarc_disable_verify == TRUE)
156 {
157 dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
158 return OK;
159 }
160
161 /* Store the header From: sender domain for this part of DMARC.
162 * If there is no from_header struct, then it's likely this message
163 * is locally generated and relying on fixups to add it. Just skip
164 * the entire DMARC system if we can't find a From: header....or if
165 * there was a previous error.
166 */
167 if (from_header == NULL || dmarc_abort == TRUE)
168 dmarc_abort = TRUE;
169 else
170 {
171 uschar * errormsg;
172 int dummy, domain;
173 uschar * p;
174 uschar saveend;
175
176 parse_allow_group = TRUE;
177 p = parse_find_address_end(from_header->text, FALSE);
178 saveend = *p; *p = '\0';
179 if ((header_from_sender = parse_extract_address(from_header->text, &errormsg,
180 &dummy, &dummy, &domain, FALSE)))
181 header_from_sender += domain;
182 *p = saveend;
183
184 /* The opendmarc library extracts the domain from the email address, but
185 * only try to store it if it's not empty. Otherwise, skip out of DMARC. */
186 if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0))
187 dmarc_abort = TRUE;
188 libdm_status = dmarc_abort ?
189 DMARC_PARSE_OKAY :
190 opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
191 if (libdm_status != DMARC_PARSE_OKAY)
192 {
193 log_write(0, LOG_MAIN|LOG_PANIC,
194 "failure to store header From: in DMARC: %s, header was '%s'",
195 opendmarc_policy_status_to_str(libdm_status), from_header->text);
196 dmarc_abort = TRUE;
197 }
198 }
199
200 /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
201 * instead do this in the ACLs. */
202 if (dmarc_abort == FALSE && sender_host_authenticated == NULL)
203 {
204 /* Use the envelope sender domain for this part of DMARC */
205 spf_sender_domain = expand_string(US"$sender_address_domain");
206 if ( spf_response == NULL )
207 {
208 /* No spf data means null envelope sender so generate a domain name
209 * from the sender_helo_name */
210 if (spf_sender_domain == NULL)
211 {
212 spf_sender_domain = sender_helo_name;
213 log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n",
214 spf_sender_domain);
215 DEBUG(D_receive)
216 debug_printf("DMARC using synthesized SPF sender domain = %s\n", spf_sender_domain);
217 }
218 dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE;
219 dmarc_spf_ares_result = ARES_RESULT_UNKNOWN;
220 origin = DMARC_POLICY_SPF_ORIGIN_HELO;
221 spf_human_readable = US"";
222 }
223 else
224 {
225 sr = spf_response->result;
226 dmarc_spf_result = (sr == SPF_RESULT_NEUTRAL) ? DMARC_POLICY_SPF_OUTCOME_NONE :
227 (sr == SPF_RESULT_PASS) ? DMARC_POLICY_SPF_OUTCOME_PASS :
228 (sr == SPF_RESULT_FAIL) ? DMARC_POLICY_SPF_OUTCOME_FAIL :
229 (sr == SPF_RESULT_SOFTFAIL) ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL :
230 DMARC_POLICY_SPF_OUTCOME_NONE;
231 dmarc_spf_ares_result = (sr == SPF_RESULT_NEUTRAL) ? ARES_RESULT_NEUTRAL :
232 (sr == SPF_RESULT_PASS) ? ARES_RESULT_PASS :
233 (sr == SPF_RESULT_FAIL) ? ARES_RESULT_FAIL :
234 (sr == SPF_RESULT_SOFTFAIL) ? ARES_RESULT_SOFTFAIL :
235 (sr == SPF_RESULT_NONE) ? ARES_RESULT_NONE :
236 (sr == SPF_RESULT_TEMPERROR) ? ARES_RESULT_TEMPERROR :
237 (sr == SPF_RESULT_PERMERROR) ? ARES_RESULT_PERMERROR :
238 ARES_RESULT_UNKNOWN;
239 origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM;
240 spf_human_readable = (uschar *)spf_response->header_comment;
241 DEBUG(D_receive)
242 debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain);
243 }
244 if (strcmp( CCS spf_sender_domain, "") == 0)
245 dmarc_abort = TRUE;
246 if (dmarc_abort == FALSE)
247 {
248 libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain,
249 dmarc_spf_result, origin, spf_human_readable);
250 if (libdm_status != DMARC_PARSE_OKAY)
251 log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s",
252 opendmarc_policy_status_to_str(libdm_status));
253 }
254
255 /* Now we cycle through the dkim signature results and put into
256 * the opendmarc context, further building the DMARC reply. */
257 sig = dkim_signatures;
258 dkim_history_buffer = US"";
259 while (sig != NULL)
260 {
261 int dkim_result, dkim_ares_result, vs, ves;
262 vs = sig->verify_status;
263 ves = sig->verify_ext_status;
264 dkim_result = ( vs == PDKIM_VERIFY_PASS ) ? DMARC_POLICY_DKIM_OUTCOME_PASS :
265 ( vs == PDKIM_VERIFY_FAIL ) ? DMARC_POLICY_DKIM_OUTCOME_FAIL :
266 ( vs == PDKIM_VERIFY_INVALID ) ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
267 DMARC_POLICY_DKIM_OUTCOME_NONE;
268 libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, (uschar *)sig->domain,
269 dkim_result, US"");
270 DEBUG(D_receive)
271 debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
272 if (libdm_status != DMARC_PARSE_OKAY)
273 log_write(0, LOG_MAIN|LOG_PANIC, "failure to store dkim (%s) for DMARC: %s",
274 sig->domain, opendmarc_policy_status_to_str(libdm_status));
275
276 dkim_ares_result = ( vs == PDKIM_VERIFY_PASS ) ? ARES_RESULT_PASS :
277 ( vs == PDKIM_VERIFY_FAIL ) ? ARES_RESULT_FAIL :
278 ( vs == PDKIM_VERIFY_NONE ) ? ARES_RESULT_NONE :
279 ( vs == PDKIM_VERIFY_INVALID ) ?
280 ( ves == PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE ? ARES_RESULT_PERMERROR :
281 ves == PDKIM_VERIFY_INVALID_BUFFER_SIZE ? ARES_RESULT_PERMERROR :
282 ves == PDKIM_VERIFY_INVALID_PUBKEY_PARSING ? ARES_RESULT_PERMERROR :
283 ARES_RESULT_UNKNOWN ) :
284 ARES_RESULT_UNKNOWN;
285 dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
286 sig->domain, dkim_ares_result);
287 sig = sig->next;
288 }
289 libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US"");
290 switch (libdm_status)
291 {
292 case DMARC_DNS_ERROR_NXDOMAIN:
293 case DMARC_DNS_ERROR_NO_RECORD:
294 DEBUG(D_receive)
295 debug_printf("DMARC no record found for %s\n", header_from_sender);
296 has_dmarc_record = FALSE;
297 break;
298 case DMARC_PARSE_OKAY:
299 DEBUG(D_receive)
300 debug_printf("DMARC record found for %s\n", header_from_sender);
301 break;
302 case DMARC_PARSE_ERROR_BAD_VALUE:
303 DEBUG(D_receive)
304 debug_printf("DMARC record parse error for %s\n", header_from_sender);
305 has_dmarc_record = FALSE;
306 break;
307 default:
308 /* everything else, skip dmarc */
309 DEBUG(D_receive)
310 debug_printf("DMARC skipping (%d), unsure what to do with %s",
311 libdm_status, from_header->text);
312 has_dmarc_record = FALSE;
313 break;
314 }
315 /* Can't use exim's string manipulation functions so allocate memory
316 * for libopendmarc using its max hostname length definition. */
317 uschar *dmarc_domain = (uschar *)calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar));
318 libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx, dmarc_domain,
319 DMARC_MAXHOSTNAMELEN-1);
320 dmarc_used_domain = string_copy(dmarc_domain);
321 free(dmarc_domain);
322 if (libdm_status != DMARC_PARSE_OKAY)
323 {
324 log_write(0, LOG_MAIN|LOG_PANIC, "failure to read domainname used for DMARC lookup: %s",
325 opendmarc_policy_status_to_str(libdm_status));
326 }
327 libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
328 dmarc_policy = libdm_status;
329 switch(libdm_status)
330 {
331 case DMARC_POLICY_ABSENT: /* No DMARC record found */
332 dmarc_status = US"norecord";
333 dmarc_pass_fail = US"none";
334 dmarc_status_text = US"No DMARC record";
335 action = DMARC_RESULT_ACCEPT;
336 break;
337 case DMARC_FROM_DOMAIN_ABSENT: /* No From: domain */
338 dmarc_status = US"nofrom";
339 dmarc_pass_fail = US"temperror";
340 dmarc_status_text = US"No From: domain found";
341 action = DMARC_RESULT_ACCEPT;
342 break;
343 case DMARC_POLICY_NONE: /* Accept and report */
344 dmarc_status = US"none";
345 dmarc_pass_fail = US"none";
346 dmarc_status_text = US"None, Accept";
347 action = DMARC_RESULT_ACCEPT;
348 break;
349 case DMARC_POLICY_PASS: /* Explicit accept */
350 dmarc_status = US"accept";
351 dmarc_pass_fail = US"pass";
352 dmarc_status_text = US"Accept";
353 action = DMARC_RESULT_ACCEPT;
354 break;
355 case DMARC_POLICY_REJECT: /* Explicit reject */
356 dmarc_status = US"reject";
357 dmarc_pass_fail = US"fail";
358 dmarc_status_text = US"Reject";
359 action = DMARC_RESULT_REJECT;
360 break;
361 case DMARC_POLICY_QUARANTINE: /* Explicit quarantine */
362 dmarc_status = US"quarantine";
363 dmarc_pass_fail = US"fail";
364 dmarc_status_text = US"Quarantine";
365 action = DMARC_RESULT_QUARANTINE;
366 break;
367 default:
368 dmarc_status = US"temperror";
369 dmarc_pass_fail = US"temperror";
370 dmarc_status_text = US"Internal Policy Error";
371 action = DMARC_RESULT_TEMPFAIL;
372 break;
373 }
374
375 libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
376 if (libdm_status != DMARC_PARSE_OKAY)
377 {
378 log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
379 opendmarc_policy_status_to_str(libdm_status));
380 }
381
382 if (has_dmarc_record == TRUE)
383 {
384 log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
385 "spf_align=%s dkim_align=%s enforcement='%s'",
386 spf_sender_domain, dmarc_used_domain,
387 (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?"yes":"no",
388 (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?"yes":"no",
389 dmarc_status_text);
390 history_file_status = dmarc_write_history_file();
391 /* Now get the forensic reporting addresses, if any */
392 ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
393 dmarc_send_forensic_report(ruf);
394 }
395 }
396
397 /* set some global variables here */
398 dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
399
400 /* shut down libopendmarc */
401 if ( dmarc_pctx != NULL )
402 (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
403 if ( dmarc_disable_verify == FALSE )
404 (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
405
406 return OK;
407 }
408
409 int dmarc_write_history_file()
410 {
411 int history_file_fd;
412 ssize_t written_len;
413 int tmp_ans;
414 u_char **rua; /* aggregate report addressees */
415 uschar *history_buffer = NULL;
416
417 if (dmarc_history_file == NULL)
418 return DMARC_HIST_DISABLED;
419 history_file_fd = log_create(dmarc_history_file);
420
421 if (history_file_fd < 0)
422 {
423 log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
424 dmarc_history_file);
425 return DMARC_HIST_FILE_ERR;
426 }
427
428 /* Generate the contents of the history file */
429 history_buffer = string_sprintf("job %s\n", message_id);
430 history_buffer = string_sprintf("%sreporter %s\n", history_buffer, primary_hostname);
431 history_buffer = string_sprintf("%sreceived %ld\n", history_buffer, time(NULL));
432 history_buffer = string_sprintf("%sipaddr %s\n", history_buffer, sender_host_address);
433 history_buffer = string_sprintf("%sfrom %s\n", history_buffer, header_from_sender);
434 history_buffer = string_sprintf("%smfrom %s\n", history_buffer,
435 expand_string(US"$sender_address_domain"));
436
437 if (spf_response != NULL)
438 history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result);
439 // history_buffer = string_sprintf("%sspf -1\n", history_buffer);
440
441 history_buffer = string_sprintf("%s%s", history_buffer, dkim_history_buffer);
442 history_buffer = string_sprintf("%spdomain %s\n", history_buffer, dmarc_used_domain);
443 history_buffer = string_sprintf("%spolicy %d\n", history_buffer, dmarc_policy);
444
445 rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1);
446 if (rua != NULL)
447 {
448 for (tmp_ans = 0; rua[tmp_ans] != NULL; tmp_ans++)
449 {
450 history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
451 }
452 }
453 else
454 history_buffer = string_sprintf("%srua -\n", history_buffer);
455
456 opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
457 history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
458
459 opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
460 history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
461
462 opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
463 history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
464
465 opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
466 history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
467
468 opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
469 history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
470
471 history_buffer = string_sprintf("%salign_dkim %d\n", history_buffer, da);
472 history_buffer = string_sprintf("%salign_spf %d\n", history_buffer, sa);
473 history_buffer = string_sprintf("%saction %d\n", history_buffer, action);
474
475 /* Write the contents to the history file */
476 DEBUG(D_receive)
477 debug_printf("DMARC logging history data for opendmarc reporting%s\n",
478 (host_checking || running_in_test_harness) ? " (not really)" : "");
479 if (host_checking || running_in_test_harness)
480 {
481 DEBUG(D_receive)
482 debug_printf("DMARC history data for debugging:\n%s", history_buffer);
483 }
484 else
485 {
486 written_len = write_to_fd_buf(history_file_fd,
487 history_buffer,
488 Ustrlen(history_buffer));
489 if (written_len == 0)
490 {
491 log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
492 dmarc_history_file);
493 return DMARC_HIST_WRITE_ERR;
494 }
495 (void)close(history_file_fd);
496 }
497 return DMARC_HIST_OK;
498 }
499
500 void dmarc_send_forensic_report(u_char **ruf)
501 {
502 int c;
503 uschar *recipient, *save_sender;
504 BOOL send_status = FALSE;
505 error_block *eblock = NULL;
506 FILE *message_file = NULL;
507
508 /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
509 if (dmarc_enable_forensic == FALSE)
510 return;
511
512 if ((dmarc_policy == DMARC_POLICY_REJECT && action == DMARC_RESULT_REJECT) ||
513 (dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE) )
514 {
515 if (ruf != NULL)
516 {
517 eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
518 eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
519 eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
520 eblock = add_to_eblock(eblock, US"SPF Alignment",
521 (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no");
522 eblock = add_to_eblock(eblock, US"DKIM Alignment",
523 (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no");
524 eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
525 /* Set a sane default envelope sender */
526 dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender :
527 dsn_from ? dsn_from :
528 string_sprintf("do-not-reply@%s",primary_hostname);
529 for (c = 0; ruf[c] != NULL; c++)
530 {
531 recipient = string_copylc(ruf[c]);
532 if (Ustrncmp(recipient, "mailto:",7))
533 continue;
534 /* Move to first character past the colon */
535 recipient += 7;
536 DEBUG(D_receive)
537 debug_printf("DMARC forensic report to %s%s\n", recipient,
538 (host_checking || running_in_test_harness) ? " (not really)" : "");
539 if (host_checking || running_in_test_harness)
540 continue;
541 save_sender = sender_address;
542 sender_address = recipient;
543 send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock,
544 header_list, message_file, FALSE);
545 sender_address = save_sender;
546 if (send_status == FALSE)
547 log_write(0, LOG_MAIN|LOG_PANIC, "failure to send DMARC forensic report to %s",
548 recipient);
549 }
550 }
551 }
552 }
553
554 uschar *dmarc_exim_expand_query(int what)
555 {
556 if (dmarc_disable_verify || !dmarc_pctx)
557 return dmarc_exim_expand_defaults(what);
558
559 switch(what) {
560 case DMARC_VERIFY_STATUS:
561 return(dmarc_status);
562 default:
563 return US"";
564 }
565 }
566
567 uschar *dmarc_exim_expand_defaults(int what)
568 {
569 switch(what) {
570 case DMARC_VERIFY_STATUS:
571 return (dmarc_disable_verify) ?
572 US"off" :
573 US"none";
574 default:
575 return US"";
576 }
577 }
578
579 uschar *dmarc_auth_results_header(header_line *from_header, uschar *hostname)
580 {
581 uschar *hdr_tmp = US"";
582
583 /* Allow a server hostname to be passed to this function, but is
584 * currently unused */
585 if (hostname == NULL)
586 hostname = primary_hostname;
587 hdr_tmp = string_sprintf("%s %s;", DMARC_AR_HEADER, hostname);
588
589 #if 0
590 /* I don't think this belongs here, but left it here commented out
591 * because it was a lot of work to get working right. */
592 if (spf_response != NULL) {
593 uschar *dmarc_ar_spf = US"";
594 int sr = 0;
595 sr = spf_response->result;
596 dmarc_ar_spf = (sr == SPF_RESULT_NEUTRAL) ? US"neutral" :
597 (sr == SPF_RESULT_PASS) ? US"pass" :
598 (sr == SPF_RESULT_FAIL) ? US"fail" :
599 (sr == SPF_RESULT_SOFTFAIL) ? US"softfail" :
600 US"none";
601 hdr_tmp = string_sprintf("%s spf=%s (%s) smtp.mail=%s;",
602 hdr_tmp, dmarc_ar_spf_result,
603 spf_response->header_comment,
604 expand_string(US"$sender_address") );
605 }
606 #endif
607 hdr_tmp = string_sprintf("%s dmarc=%s",
608 hdr_tmp, dmarc_pass_fail);
609 if (header_from_sender)
610 hdr_tmp = string_sprintf("%s header.from=%s",
611 hdr_tmp, header_from_sender);
612 return hdr_tmp;
613 }
614
615 #endif /* EXPERIMENTAL_SPF */
616 #endif /* EXPERIMENTAL_DMARC */
617
618 // vim:sw=2 expandtab