Commit | Line | Data |
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420a0d19 CE |
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 | |
2ea97746 | 15 | # if !defined SUPPORT_SPF |
420a0d19 CE |
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"; | |
420a0d19 CE |
31 | header_line *from_header = NULL; |
32 | extern SPF_response_t *spf_response; | |
33 | int dmarc_spf_ares_result = 0; | |
34 | uschar *spf_sender_domain = NULL; | |
35 | uschar *spf_human_readable = NULL; | |
36 | u_char *header_from_sender = NULL; | |
37 | int history_file_status = DMARC_HIST_OK; | |
38 | uschar *dkim_history_buffer= NULL; | |
39 | ||
40 | typedef struct dmarc_exim_p { | |
41 | uschar *name; | |
42 | int value; | |
43 | } dmarc_exim_p; | |
44 | ||
45 | static dmarc_exim_p dmarc_policy_description[] = { | |
2ea97746 | 46 | /* name value */ |
420a0d19 CE |
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 | { | |
2ea97746 | 60 | error_block *eb = store_malloc(sizeof(error_block)); |
420a0d19 CE |
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 | ||
2ea97746 CE |
81 | int |
82 | dmarc_init() | |
420a0d19 CE |
83 | { |
84 | int *netmask = NULL; /* Ignored */ | |
85 | int is_ipv6 = 0; | |
420a0d19 CE |
86 | |
87 | /* Set some sane defaults. Also clears previous results when | |
88 | * multiple messages in one connection. */ | |
89 | dmarc_pctx = NULL; | |
90 | dmarc_status = US"none"; | |
91 | dmarc_abort = FALSE; | |
92 | dmarc_pass_fail = US"skipped"; | |
93 | dmarc_used_domain = US""; | |
2ea97746 | 94 | f.dmarc_has_been_checked = FALSE; |
420a0d19 CE |
95 | header_from_sender = NULL; |
96 | spf_sender_domain = NULL; | |
97 | spf_human_readable = NULL; | |
98 | ||
99 | /* ACLs have "control=dmarc_disable_verify" */ | |
2ea97746 | 100 | if (f.dmarc_disable_verify == TRUE) |
420a0d19 CE |
101 | return OK; |
102 | ||
103 | (void) memset(&dmarc_ctx, '\0', sizeof dmarc_ctx); | |
104 | dmarc_ctx.nscount = 0; | |
105 | libdm_status = opendmarc_policy_library_init(&dmarc_ctx); | |
106 | if (libdm_status != DMARC_PARSE_OKAY) | |
107 | { | |
108 | log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to init library: %s", | |
109 | opendmarc_policy_status_to_str(libdm_status)); | |
110 | dmarc_abort = TRUE; | |
111 | } | |
2ea97746 CE |
112 | if (!dmarc_tld_file) |
113 | { | |
114 | DEBUG(D_receive) debug_printf("DMARC: no dmarc_tld_file\n"); | |
420a0d19 | 115 | dmarc_abort = TRUE; |
2ea97746 CE |
116 | } |
117 | else if (opendmarc_tld_read_file(CS dmarc_tld_file, NULL, NULL, NULL)) | |
420a0d19 CE |
118 | { |
119 | log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list %s: %d", | |
2ea97746 | 120 | dmarc_tld_file, errno); |
420a0d19 CE |
121 | dmarc_abort = TRUE; |
122 | } | |
2ea97746 CE |
123 | if (!sender_host_address) |
124 | { | |
125 | DEBUG(D_receive) debug_printf("DMARC: no sender_host_address\n"); | |
420a0d19 | 126 | dmarc_abort = TRUE; |
2ea97746 | 127 | } |
420a0d19 CE |
128 | /* This catches locally originated email and startup errors above. */ |
129 | if (!dmarc_abort) | |
130 | { | |
131 | is_ipv6 = string_is_ip_address(sender_host_address, netmask) == 6; | |
2ea97746 | 132 | if (!(dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6))) |
420a0d19 CE |
133 | { |
134 | log_write(0, LOG_MAIN|LOG_PANIC, | |
135 | "DMARC failure creating policy context: ip=%s", 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 | |
2ea97746 | 145 | dmarc_process can access the data */ |
420a0d19 | 146 | |
2ea97746 CE |
147 | int |
148 | dmarc_store_data(header_line *hdr) | |
149 | { | |
150 | /* No debug output because would change every test debug output */ | |
151 | if (!f.dmarc_disable_verify) | |
152 | from_header = hdr; | |
153 | return OK; | |
420a0d19 CE |
154 | } |
155 | ||
156 | ||
2ea97746 CE |
157 | static void |
158 | dmarc_send_forensic_report(u_char **ruf) | |
159 | { | |
160 | int c; | |
161 | uschar *recipient, *save_sender; | |
162 | BOOL send_status = FALSE; | |
163 | error_block *eblock = NULL; | |
164 | FILE *message_file = NULL; | |
165 | ||
166 | /* Earlier ACL does not have *required* control=dmarc_enable_forensic */ | |
167 | if (!f.dmarc_enable_forensic) | |
168 | return; | |
169 | ||
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 | |
174 | ) | |
175 | if (ruf) | |
176 | { | |
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); | |
185 | ||
186 | for (c = 0; ruf[c]; c++) | |
187 | { | |
188 | recipient = string_copylc(ruf[c]); | |
189 | if (Ustrncmp(recipient, "mailto:",7)) | |
190 | continue; | |
191 | /* Move to first character past the colon */ | |
192 | recipient += 7; | |
193 | DEBUG(D_receive) | |
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) | |
197 | continue; | |
198 | ||
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); | |
203 | } | |
204 | } | |
205 | } | |
206 | ||
420a0d19 | 207 | /* dmarc_process adds the envelope sender address to the existing |
2ea97746 CE |
208 | context (if any), retrieves the result, sets up expansion |
209 | strings and evaluates the condition outcome. */ | |
420a0d19 CE |
210 | |
211 | int | |
212 | dmarc_process() | |
213 | { | |
214 | int sr, origin; /* used in SPF section */ | |
215 | int dmarc_spf_result = 0; /* stores spf into dmarc conn ctx */ | |
216 | int tmp_ans, c; | |
2ea97746 | 217 | pdkim_signature * sig = dkim_signatures; |
420a0d19 CE |
218 | BOOL has_dmarc_record = TRUE; |
219 | u_char **ruf; /* forensic report addressees, if called for */ | |
220 | ||
221 | /* ACLs have "control=dmarc_disable_verify" */ | |
2ea97746 | 222 | if (f.dmarc_disable_verify) |
420a0d19 | 223 | return OK; |
420a0d19 CE |
224 | |
225 | /* Store the header From: sender domain for this part of DMARC. | |
226 | * If there is no from_header struct, then it's likely this message | |
227 | * is locally generated and relying on fixups to add it. Just skip | |
228 | * the entire DMARC system if we can't find a From: header....or if | |
229 | * there was a previous error. | |
230 | */ | |
2ea97746 CE |
231 | if (!from_header) |
232 | { | |
233 | DEBUG(D_receive) debug_printf("DMARC: no From: header\n"); | |
420a0d19 | 234 | dmarc_abort = TRUE; |
2ea97746 CE |
235 | } |
236 | else if (!dmarc_abort) | |
420a0d19 | 237 | { |
2ea97746 CE |
238 | uschar * errormsg; |
239 | int dummy, domain; | |
240 | uschar * p; | |
241 | uschar saveend; | |
242 | ||
243 | f.parse_allow_group = TRUE; | |
244 | p = parse_find_address_end(from_header->text, FALSE); | |
245 | saveend = *p; *p = '\0'; | |
246 | if ((header_from_sender = parse_extract_address(from_header->text, &errormsg, | |
247 | &dummy, &dummy, &domain, FALSE))) | |
248 | header_from_sender += domain; | |
249 | *p = saveend; | |
250 | ||
251 | /* The opendmarc library extracts the domain from the email address, but | |
252 | * only try to store it if it's not empty. Otherwise, skip out of DMARC. */ | |
253 | if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0)) | |
254 | dmarc_abort = TRUE; | |
255 | libdm_status = dmarc_abort | |
256 | ? DMARC_PARSE_OKAY | |
257 | : opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender); | |
258 | if (libdm_status != DMARC_PARSE_OKAY) | |
420a0d19 CE |
259 | { |
260 | log_write(0, LOG_MAIN|LOG_PANIC, | |
261 | "failure to store header From: in DMARC: %s, header was '%s'", | |
262 | opendmarc_policy_status_to_str(libdm_status), from_header->text); | |
263 | dmarc_abort = TRUE; | |
264 | } | |
265 | } | |
266 | ||
267 | /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should | |
268 | * instead do this in the ACLs. */ | |
269 | if (!dmarc_abort && !sender_host_authenticated) | |
270 | { | |
2ea97746 CE |
271 | uschar * dmarc_domain; |
272 | ||
420a0d19 CE |
273 | /* Use the envelope sender domain for this part of DMARC */ |
274 | spf_sender_domain = expand_string(US"$sender_address_domain"); | |
275 | if (!spf_response) | |
276 | { | |
277 | /* No spf data means null envelope sender so generate a domain name | |
278 | * from the sender_helo_name */ | |
279 | if (!spf_sender_domain) | |
280 | { | |
281 | spf_sender_domain = sender_helo_name; | |
282 | log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n", | |
283 | spf_sender_domain); | |
284 | DEBUG(D_receive) | |
285 | debug_printf("DMARC using synthesized SPF sender domain = %s\n", | |
286 | spf_sender_domain); | |
287 | } | |
288 | dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE; | |
289 | dmarc_spf_ares_result = ARES_RESULT_UNKNOWN; | |
290 | origin = DMARC_POLICY_SPF_ORIGIN_HELO; | |
291 | spf_human_readable = US""; | |
292 | } | |
293 | else | |
294 | { | |
295 | sr = spf_response->result; | |
296 | dmarc_spf_result = sr == SPF_RESULT_NEUTRAL ? DMARC_POLICY_SPF_OUTCOME_NONE : | |
297 | sr == SPF_RESULT_PASS ? DMARC_POLICY_SPF_OUTCOME_PASS : | |
298 | sr == SPF_RESULT_FAIL ? DMARC_POLICY_SPF_OUTCOME_FAIL : | |
299 | sr == SPF_RESULT_SOFTFAIL ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL : | |
300 | DMARC_POLICY_SPF_OUTCOME_NONE; | |
301 | dmarc_spf_ares_result = sr == SPF_RESULT_NEUTRAL ? ARES_RESULT_NEUTRAL : | |
302 | sr == SPF_RESULT_PASS ? ARES_RESULT_PASS : | |
303 | sr == SPF_RESULT_FAIL ? ARES_RESULT_FAIL : | |
304 | sr == SPF_RESULT_SOFTFAIL ? ARES_RESULT_SOFTFAIL : | |
305 | sr == SPF_RESULT_NONE ? ARES_RESULT_NONE : | |
306 | sr == SPF_RESULT_TEMPERROR ? ARES_RESULT_TEMPERROR : | |
307 | sr == SPF_RESULT_PERMERROR ? ARES_RESULT_PERMERROR : | |
308 | ARES_RESULT_UNKNOWN; | |
309 | origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM; | |
2ea97746 | 310 | spf_human_readable = US spf_response->header_comment; |
420a0d19 CE |
311 | DEBUG(D_receive) |
312 | debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain); | |
313 | } | |
314 | if (strcmp( CCS spf_sender_domain, "") == 0) | |
315 | dmarc_abort = TRUE; | |
316 | if (!dmarc_abort) | |
317 | { | |
318 | libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain, | |
319 | dmarc_spf_result, origin, spf_human_readable); | |
320 | if (libdm_status != DMARC_PARSE_OKAY) | |
321 | log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s", | |
322 | opendmarc_policy_status_to_str(libdm_status)); | |
323 | } | |
324 | ||
325 | /* Now we cycle through the dkim signature results and put into | |
326 | * the opendmarc context, further building the DMARC reply. */ | |
420a0d19 CE |
327 | dkim_history_buffer = US""; |
328 | while (sig) | |
329 | { | |
330 | int dkim_result, dkim_ares_result, vs, ves; | |
2ea97746 CE |
331 | |
332 | vs = sig->verify_status & ~PDKIM_VERIFY_POLICY; | |
420a0d19 CE |
333 | ves = sig->verify_ext_status; |
334 | dkim_result = vs == PDKIM_VERIFY_PASS ? DMARC_POLICY_DKIM_OUTCOME_PASS : | |
335 | vs == PDKIM_VERIFY_FAIL ? DMARC_POLICY_DKIM_OUTCOME_FAIL : | |
336 | vs == PDKIM_VERIFY_INVALID ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL : | |
337 | DMARC_POLICY_DKIM_OUTCOME_NONE; | |
2ea97746 | 338 | libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, US sig->domain, |
420a0d19 CE |
339 | dkim_result, US""); |
340 | DEBUG(D_receive) | |
341 | debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain); | |
342 | if (libdm_status != DMARC_PARSE_OKAY) | |
343 | log_write(0, LOG_MAIN|LOG_PANIC, | |
344 | "failure to store dkim (%s) for DMARC: %s", | |
345 | sig->domain, opendmarc_policy_status_to_str(libdm_status)); | |
346 | ||
347 | dkim_ares_result = | |
348 | vs == PDKIM_VERIFY_PASS ? ARES_RESULT_PASS : | |
349 | vs == PDKIM_VERIFY_FAIL ? ARES_RESULT_FAIL : | |
350 | vs == PDKIM_VERIFY_NONE ? ARES_RESULT_NONE : | |
351 | vs == PDKIM_VERIFY_INVALID ? | |
352 | ves == PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE ? ARES_RESULT_PERMERROR : | |
353 | ves == PDKIM_VERIFY_INVALID_BUFFER_SIZE ? ARES_RESULT_PERMERROR : | |
2ea97746 CE |
354 | ves == PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD ? ARES_RESULT_PERMERROR : |
355 | ves == PDKIM_VERIFY_INVALID_PUBKEY_IMPORT ? ARES_RESULT_PERMERROR : | |
420a0d19 CE |
356 | ARES_RESULT_UNKNOWN : |
357 | ARES_RESULT_UNKNOWN; | |
358 | dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer, | |
359 | sig->domain, dkim_ares_result); | |
360 | sig = sig->next; | |
361 | } | |
362 | libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US""); | |
363 | switch (libdm_status) | |
364 | { | |
365 | case DMARC_DNS_ERROR_NXDOMAIN: | |
366 | case DMARC_DNS_ERROR_NO_RECORD: | |
367 | DEBUG(D_receive) | |
368 | debug_printf("DMARC no record found for %s\n", header_from_sender); | |
369 | has_dmarc_record = FALSE; | |
370 | break; | |
371 | case DMARC_PARSE_OKAY: | |
372 | DEBUG(D_receive) | |
373 | debug_printf("DMARC record found for %s\n", header_from_sender); | |
374 | break; | |
375 | case DMARC_PARSE_ERROR_BAD_VALUE: | |
376 | DEBUG(D_receive) | |
377 | debug_printf("DMARC record parse error for %s\n", header_from_sender); | |
378 | has_dmarc_record = FALSE; | |
379 | break; | |
380 | default: | |
381 | /* everything else, skip dmarc */ | |
382 | DEBUG(D_receive) | |
383 | debug_printf("DMARC skipping (%d), unsure what to do with %s", | |
384 | libdm_status, from_header->text); | |
385 | has_dmarc_record = FALSE; | |
386 | break; | |
387 | } | |
388 | ||
389 | /* Store the policy string in an expandable variable. */ | |
390 | ||
391 | libdm_status = opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans); | |
392 | for (c = 0; dmarc_policy_description[c].name; c++) | |
393 | if (tmp_ans == dmarc_policy_description[c].value) | |
394 | { | |
395 | dmarc_domain_policy = string_sprintf("%s",dmarc_policy_description[c].name); | |
396 | break; | |
397 | } | |
398 | ||
399 | /* Can't use exim's string manipulation functions so allocate memory | |
2ea97746 | 400 | for libopendmarc using its max hostname length definition. */ |
420a0d19 | 401 | |
2ea97746 | 402 | dmarc_domain = US calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar)); |
420a0d19 CE |
403 | libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx, |
404 | dmarc_domain, DMARC_MAXHOSTNAMELEN-1); | |
405 | dmarc_used_domain = string_copy(dmarc_domain); | |
406 | free(dmarc_domain); | |
407 | ||
408 | if (libdm_status != DMARC_PARSE_OKAY) | |
409 | log_write(0, LOG_MAIN|LOG_PANIC, | |
410 | "failure to read domainname used for DMARC lookup: %s", | |
411 | opendmarc_policy_status_to_str(libdm_status)); | |
412 | ||
2ea97746 | 413 | dmarc_policy = libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx); |
420a0d19 CE |
414 | switch(libdm_status) |
415 | { | |
416 | case DMARC_POLICY_ABSENT: /* No DMARC record found */ | |
417 | dmarc_status = US"norecord"; | |
418 | dmarc_pass_fail = US"none"; | |
419 | dmarc_status_text = US"No DMARC record"; | |
420 | action = DMARC_RESULT_ACCEPT; | |
421 | break; | |
422 | case DMARC_FROM_DOMAIN_ABSENT: /* No From: domain */ | |
423 | dmarc_status = US"nofrom"; | |
424 | dmarc_pass_fail = US"temperror"; | |
425 | dmarc_status_text = US"No From: domain found"; | |
426 | action = DMARC_RESULT_ACCEPT; | |
427 | break; | |
428 | case DMARC_POLICY_NONE: /* Accept and report */ | |
429 | dmarc_status = US"none"; | |
430 | dmarc_pass_fail = US"none"; | |
431 | dmarc_status_text = US"None, Accept"; | |
432 | action = DMARC_RESULT_ACCEPT; | |
433 | break; | |
434 | case DMARC_POLICY_PASS: /* Explicit accept */ | |
435 | dmarc_status = US"accept"; | |
436 | dmarc_pass_fail = US"pass"; | |
437 | dmarc_status_text = US"Accept"; | |
438 | action = DMARC_RESULT_ACCEPT; | |
439 | break; | |
440 | case DMARC_POLICY_REJECT: /* Explicit reject */ | |
441 | dmarc_status = US"reject"; | |
442 | dmarc_pass_fail = US"fail"; | |
443 | dmarc_status_text = US"Reject"; | |
444 | action = DMARC_RESULT_REJECT; | |
445 | break; | |
446 | case DMARC_POLICY_QUARANTINE: /* Explicit quarantine */ | |
447 | dmarc_status = US"quarantine"; | |
448 | dmarc_pass_fail = US"fail"; | |
449 | dmarc_status_text = US"Quarantine"; | |
450 | action = DMARC_RESULT_QUARANTINE; | |
451 | break; | |
452 | default: | |
453 | dmarc_status = US"temperror"; | |
454 | dmarc_pass_fail = US"temperror"; | |
455 | dmarc_status_text = US"Internal Policy Error"; | |
456 | action = DMARC_RESULT_TEMPFAIL; | |
457 | break; | |
458 | } | |
459 | ||
460 | libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa); | |
461 | if (libdm_status != DMARC_PARSE_OKAY) | |
462 | log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s", | |
463 | opendmarc_policy_status_to_str(libdm_status)); | |
464 | ||
2ea97746 | 465 | if (has_dmarc_record) |
420a0d19 CE |
466 | { |
467 | log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s " | |
468 | "spf_align=%s dkim_align=%s enforcement='%s'", | |
469 | spf_sender_domain, dmarc_used_domain, | |
2ea97746 CE |
470 | sa==DMARC_POLICY_SPF_ALIGNMENT_PASS ?"yes":"no", |
471 | da==DMARC_POLICY_DKIM_ALIGNMENT_PASS ?"yes":"no", | |
420a0d19 CE |
472 | dmarc_status_text); |
473 | history_file_status = dmarc_write_history_file(); | |
474 | /* Now get the forensic reporting addresses, if any */ | |
475 | ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1); | |
476 | dmarc_send_forensic_report(ruf); | |
477 | } | |
478 | } | |
479 | ||
420a0d19 | 480 | /* shut down libopendmarc */ |
2ea97746 | 481 | if (dmarc_pctx) |
420a0d19 | 482 | (void) opendmarc_policy_connect_shutdown(dmarc_pctx); |
2ea97746 | 483 | if (!f.dmarc_disable_verify) |
420a0d19 CE |
484 | (void) opendmarc_policy_library_shutdown(&dmarc_ctx); |
485 | ||
486 | return OK; | |
487 | } | |
488 | ||
2ea97746 | 489 | static int |
420a0d19 CE |
490 | dmarc_write_history_file() |
491 | { | |
492 | int history_file_fd; | |
493 | ssize_t written_len; | |
494 | int tmp_ans; | |
495 | u_char **rua; /* aggregate report addressees */ | |
496 | uschar *history_buffer = NULL; | |
497 | ||
498 | if (!dmarc_history_file) | |
2ea97746 CE |
499 | { |
500 | DEBUG(D_receive) debug_printf("DMARC history file not set\n"); | |
420a0d19 | 501 | return DMARC_HIST_DISABLED; |
2ea97746 | 502 | } |
420a0d19 CE |
503 | history_file_fd = log_create(dmarc_history_file); |
504 | ||
505 | if (history_file_fd < 0) | |
2ea97746 | 506 | { |
420a0d19 CE |
507 | log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s", |
508 | dmarc_history_file); | |
509 | return DMARC_HIST_FILE_ERR; | |
2ea97746 | 510 | } |
420a0d19 CE |
511 | |
512 | /* Generate the contents of the history file */ | |
513 | history_buffer = string_sprintf( | |
514 | "job %s\nreporter %s\nreceived %ld\nipaddr %s\nfrom %s\nmfrom %s\n", | |
515 | message_id, primary_hostname, time(NULL), sender_host_address, | |
516 | header_from_sender, expand_string(US"$sender_address_domain")); | |
517 | ||
518 | if (spf_response) | |
519 | history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result); | |
520 | /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */ | |
521 | ||
522 | history_buffer = string_sprintf( | |
523 | "%s%spdomain %s\npolicy %d\n", | |
524 | history_buffer, dkim_history_buffer, dmarc_used_domain, dmarc_policy); | |
525 | ||
526 | if ((rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1))) | |
527 | for (tmp_ans = 0; rua[tmp_ans]; tmp_ans++) | |
528 | history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]); | |
529 | else | |
530 | history_buffer = string_sprintf("%srua -\n", history_buffer); | |
531 | ||
532 | opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans); | |
533 | history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans); | |
534 | ||
535 | opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans); | |
536 | history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans); | |
537 | ||
538 | opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans); | |
539 | history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans); | |
540 | ||
541 | opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans); | |
542 | history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans); | |
543 | ||
544 | opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans); | |
545 | history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans); | |
546 | ||
547 | history_buffer = string_sprintf( | |
548 | "%salign_dkim %d\nalign_spf %d\naction %d\n", | |
549 | history_buffer, da, sa, action); | |
550 | ||
551 | /* Write the contents to the history file */ | |
552 | DEBUG(D_receive) | |
553 | debug_printf("DMARC logging history data for opendmarc reporting%s\n", | |
2ea97746 CE |
554 | (host_checking || f.running_in_test_harness) ? " (not really)" : ""); |
555 | if (host_checking || f.running_in_test_harness) | |
420a0d19 CE |
556 | { |
557 | DEBUG(D_receive) | |
558 | debug_printf("DMARC history data for debugging:\n%s", history_buffer); | |
559 | } | |
560 | else | |
561 | { | |
562 | written_len = write_to_fd_buf(history_file_fd, | |
563 | history_buffer, | |
564 | Ustrlen(history_buffer)); | |
565 | if (written_len == 0) | |
566 | { | |
567 | log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s", | |
568 | dmarc_history_file); | |
569 | return DMARC_HIST_WRITE_ERR; | |
570 | } | |
571 | (void)close(history_file_fd); | |
572 | } | |
573 | return DMARC_HIST_OK; | |
574 | } | |
575 | ||
420a0d19 CE |
576 | |
577 | uschar * | |
578 | dmarc_exim_expand_query(int what) | |
579 | { | |
2ea97746 | 580 | if (f.dmarc_disable_verify || !dmarc_pctx) |
420a0d19 CE |
581 | return dmarc_exim_expand_defaults(what); |
582 | ||
2ea97746 CE |
583 | if (what == DMARC_VERIFY_STATUS) |
584 | return dmarc_status; | |
585 | return US""; | |
420a0d19 CE |
586 | } |
587 | ||
588 | uschar * | |
589 | dmarc_exim_expand_defaults(int what) | |
590 | { | |
2ea97746 CE |
591 | if (what == DMARC_VERIFY_STATUS) |
592 | return f.dmarc_disable_verify ? US"off" : US"none"; | |
593 | return US""; | |
420a0d19 CE |
594 | } |
595 | ||
420a0d19 | 596 | |
2ea97746 CE |
597 | gstring * |
598 | authres_dmarc(gstring * g) | |
599 | { | |
600 | if (f.dmarc_has_been_checked) | |
601 | { | |
602 | g = string_append(g, 2, US";\n\tdmarc=", dmarc_pass_fail); | |
603 | if (header_from_sender) | |
604 | g = string_append(g, 2, US" header.from=", header_from_sender); | |
605 | } | |
606 | return g; | |
420a0d19 CE |
607 | } |
608 | ||
2ea97746 | 609 | # endif /* SUPPORT_SPF */ |
420a0d19 CE |
610 | #endif /* EXPERIMENTAL_DMARC */ |
611 | /* vi: aw ai sw=2 | |
612 | */ |