Commit | Line | Data |
---|---|---|
4840604e TL |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | /* Experimental DMARC support. | |
5a66c31b | 5 | Copyright (c) Todd Lyons <tlyons@exim.org> 2012 - 2014 |
4840604e TL |
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 | |
7952eef9 | 15 | # if !defined SUPPORT_SPF |
c007c974 JH |
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 | |
4840604e | 20 | |
c007c974 JH |
21 | # include "functions.h" |
22 | # include "dmarc.h" | |
23 | # include "pdkim/pdkim.h" | |
4840604e TL |
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; | |
4840604e | 33 | extern SPF_response_t *spf_response; |
620df281 | 34 | int dmarc_spf_ares_result = 0; |
4840604e TL |
35 | uschar *spf_sender_domain = NULL; |
36 | uschar *spf_human_readable = NULL; | |
4840604e TL |
37 | u_char *header_from_sender = NULL; |
38 | int history_file_status = DMARC_HIST_OK; | |
4840604e TL |
39 | uschar *dkim_history_buffer= NULL; |
40 | ||
8c8b8274 TL |
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[] = { | |
f2ed27cf | 47 | /* name value */ |
8c8b8274 TL |
48 | { US"", DMARC_RECORD_P_UNSPECIFIED }, |
49 | { US"none", DMARC_RECORD_P_NONE }, | |
50 | { US"quarantine", DMARC_RECORD_P_QUARANTINE }, | |
51 | { US"reject", DMARC_RECORD_P_REJECT }, | |
52 | { NULL, 0 } | |
53 | }; | |
4840604e TL |
54 | /* Accept an error_block struct, initialize if empty, parse to the |
55 | * end, and append the two strings passed to it. Used for adding | |
56 | * variable amounts of value:pair data to the forensic emails. */ | |
57 | ||
58 | static error_block * | |
59 | add_to_eblock(error_block *eblock, uschar *t1, uschar *t2) | |
60 | { | |
40c90bca | 61 | error_block *eb = store_malloc(sizeof(error_block)); |
c007c974 JH |
62 | if (eblock == NULL) |
63 | eblock = eb; | |
64 | else | |
4840604e | 65 | { |
c007c974 JH |
66 | /* Find the end of the eblock struct and point it at eb */ |
67 | error_block *tmp = eblock; | |
68 | while(tmp->next != NULL) | |
69 | tmp = tmp->next; | |
70 | tmp->next = eb; | |
4840604e | 71 | } |
c007c974 JH |
72 | eb->text1 = t1; |
73 | eb->text2 = t2; | |
74 | eb->next = NULL; | |
75 | return eblock; | |
4840604e TL |
76 | } |
77 | ||
78 | /* dmarc_init sets up a context that can be re-used for several | |
79 | messages on the same SMTP connection (that come from the | |
80 | same host with the same HELO string) */ | |
81 | ||
5bfe3b35 JH |
82 | int |
83 | dmarc_init() | |
4a8ce2d8 | 84 | { |
c007c974 JH |
85 | int *netmask = NULL; /* Ignored */ |
86 | int is_ipv6 = 0; | |
c007c974 JH |
87 | |
88 | /* Set some sane defaults. Also clears previous results when | |
89 | * multiple messages in one connection. */ | |
90 | dmarc_pctx = NULL; | |
91 | dmarc_status = US"none"; | |
92 | dmarc_abort = FALSE; | |
93 | dmarc_pass_fail = US"skipped"; | |
94 | dmarc_used_domain = US""; | |
c007c974 JH |
95 | dmarc_has_been_checked = FALSE; |
96 | header_from_sender = NULL; | |
97 | spf_sender_domain = NULL; | |
98 | spf_human_readable = NULL; | |
99 | ||
100 | /* ACLs have "control=dmarc_disable_verify" */ | |
101 | if (dmarc_disable_verify == TRUE) | |
102 | return OK; | |
103 | ||
104 | (void) memset(&dmarc_ctx, '\0', sizeof dmarc_ctx); | |
105 | dmarc_ctx.nscount = 0; | |
106 | libdm_status = opendmarc_policy_library_init(&dmarc_ctx); | |
107 | if (libdm_status != DMARC_PARSE_OKAY) | |
4840604e | 108 | { |
c007c974 JH |
109 | log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to init library: %s", |
110 | opendmarc_policy_status_to_str(libdm_status)); | |
111 | dmarc_abort = TRUE; | |
4840604e | 112 | } |
d7b5f2ab JH |
113 | if (!dmarc_tld_file) |
114 | { | |
115 | DEBUG(D_receive) debug_printf("DMARC: no dmarc_tld_file\n"); | |
c007c974 | 116 | dmarc_abort = TRUE; |
d7b5f2ab JH |
117 | } |
118 | else if (opendmarc_tld_read_file(dmarc_tld_file, NULL, NULL, NULL)) | |
4840604e | 119 | { |
c007c974 | 120 | log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list %s: %d", |
d7b5f2ab | 121 | dmarc_tld_file, errno); |
c007c974 | 122 | dmarc_abort = TRUE; |
4840604e | 123 | } |
d7b5f2ab JH |
124 | if (!sender_host_address) |
125 | { | |
126 | DEBUG(D_receive) debug_printf("DMARC: no sender_host_address\n"); | |
c007c974 | 127 | dmarc_abort = TRUE; |
d7b5f2ab | 128 | } |
c007c974 JH |
129 | /* This catches locally originated email and startup errors above. */ |
130 | if (!dmarc_abort) | |
4840604e | 131 | { |
c007c974 | 132 | is_ipv6 = string_is_ip_address(sender_host_address, netmask) == 6; |
d7b5f2ab | 133 | if (!(dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6))) |
4840604e | 134 | { |
c007c974 JH |
135 | log_write(0, LOG_MAIN|LOG_PANIC, |
136 | "DMARC failure creating policy context: ip=%s", sender_host_address); | |
137 | dmarc_abort = TRUE; | |
4840604e TL |
138 | } |
139 | } | |
140 | ||
c007c974 | 141 | return OK; |
4840604e TL |
142 | } |
143 | ||
144 | ||
145 | /* dmarc_store_data stores the header data so that subsequent | |
c9cf9ac4 | 146 | dmarc_process can access the data */ |
4840604e | 147 | |
c9cf9ac4 JH |
148 | int |
149 | dmarc_store_data(header_line *hdr) | |
150 | { | |
151 | /* No debug output because would change every test debug output */ | |
152 | if (!dmarc_disable_verify) | |
153 | from_header = hdr; | |
154 | return OK; | |
4840604e TL |
155 | } |
156 | ||
157 | ||
72a201e2 TM |
158 | static void |
159 | dmarc_send_forensic_report(u_char **ruf) | |
160 | { | |
161 | int c; | |
162 | uschar *recipient, *save_sender; | |
163 | BOOL send_status = FALSE; | |
164 | error_block *eblock = NULL; | |
165 | FILE *message_file = NULL; | |
166 | ||
167 | /* Earlier ACL does not have *required* control=dmarc_enable_forensic */ | |
168 | if (!dmarc_enable_forensic) | |
169 | return; | |
170 | ||
171 | if ( dmarc_policy == DMARC_POLICY_REJECT && action == DMARC_RESULT_REJECT | |
172 | || dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE | |
173 | || dmarc_policy == DMARC_POLICY_NONE && action == DMARC_RESULT_REJECT | |
174 | || dmarc_policy == DMARC_POLICY_NONE && action == DMARC_RESULT_QUARANTINE | |
175 | ) | |
176 | if (ruf) | |
177 | { | |
178 | eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain); | |
179 | eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address); | |
180 | eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full)); | |
181 | eblock = add_to_eblock(eblock, US"SPF Alignment", | |
182 | (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no"); | |
183 | eblock = add_to_eblock(eblock, US"DKIM Alignment", | |
184 | (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no"); | |
185 | eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text); | |
186 | /* Set a sane default envelope sender */ | |
187 | dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender : | |
188 | dsn_from ? dsn_from : | |
189 | string_sprintf("do-not-reply@%s",primary_hostname); | |
190 | for (c = 0; ruf[c]; c++) | |
191 | { | |
192 | recipient = string_copylc(ruf[c]); | |
193 | if (Ustrncmp(recipient, "mailto:",7)) | |
194 | continue; | |
195 | /* Move to first character past the colon */ | |
196 | recipient += 7; | |
197 | DEBUG(D_receive) | |
198 | debug_printf("DMARC forensic report to %s%s\n", recipient, | |
199 | (host_checking || running_in_test_harness) ? " (not really)" : ""); | |
200 | if (host_checking || running_in_test_harness) | |
201 | continue; | |
202 | ||
203 | save_sender = sender_address; | |
204 | sender_address = recipient; | |
205 | send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock, | |
206 | header_list, message_file, FALSE); | |
207 | sender_address = save_sender; | |
208 | if (!send_status) | |
209 | log_write(0, LOG_MAIN|LOG_PANIC, | |
210 | "failure to send DMARC forensic report to %s", recipient); | |
211 | } | |
212 | } | |
213 | } | |
214 | ||
4840604e | 215 | /* dmarc_process adds the envelope sender address to the existing |
c9cf9ac4 JH |
216 | context (if any), retrieves the result, sets up expansion |
217 | strings and evaluates the condition outcome. */ | |
4840604e | 218 | |
c007c974 JH |
219 | int |
220 | dmarc_process() | |
221 | { | |
222 | int sr, origin; /* used in SPF section */ | |
223 | int dmarc_spf_result = 0; /* stores spf into dmarc conn ctx */ | |
224 | int tmp_ans, c; | |
225 | pdkim_signature *sig = NULL; | |
226 | BOOL has_dmarc_record = TRUE; | |
227 | u_char **ruf; /* forensic report addressees, if called for */ | |
228 | ||
229 | /* ACLs have "control=dmarc_disable_verify" */ | |
230 | if (dmarc_disable_verify) | |
c007c974 | 231 | return OK; |
4840604e | 232 | |
c007c974 JH |
233 | /* Store the header From: sender domain for this part of DMARC. |
234 | * If there is no from_header struct, then it's likely this message | |
235 | * is locally generated and relying on fixups to add it. Just skip | |
236 | * the entire DMARC system if we can't find a From: header....or if | |
237 | * there was a previous error. | |
238 | */ | |
d7b5f2ab JH |
239 | if (!from_header) |
240 | { | |
241 | DEBUG(D_receive) debug_printf("DMARC: no From: header\n"); | |
c007c974 | 242 | dmarc_abort = TRUE; |
d7b5f2ab JH |
243 | } |
244 | else if (!dmarc_abort) | |
4840604e | 245 | { |
d502442a TL |
246 | uschar * errormsg; |
247 | int dummy, domain; | |
248 | uschar * p; | |
249 | uschar saveend; | |
250 | ||
251 | parse_allow_group = TRUE; | |
252 | p = parse_find_address_end(from_header->text, FALSE); | |
253 | saveend = *p; *p = '\0'; | |
254 | if ((header_from_sender = parse_extract_address(from_header->text, &errormsg, | |
255 | &dummy, &dummy, &domain, FALSE))) | |
256 | header_from_sender += domain; | |
257 | *p = saveend; | |
258 | ||
4840604e TL |
259 | /* The opendmarc library extracts the domain from the email address, but |
260 | * only try to store it if it's not empty. Otherwise, skip out of DMARC. */ | |
d502442a | 261 | if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0)) |
4840604e | 262 | dmarc_abort = TRUE; |
d502442a | 263 | libdm_status = dmarc_abort ? |
5a1b8443 WB |
264 | DMARC_PARSE_OKAY : |
265 | opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender); | |
4840604e TL |
266 | if (libdm_status != DMARC_PARSE_OKAY) |
267 | { | |
c007c974 JH |
268 | log_write(0, LOG_MAIN|LOG_PANIC, |
269 | "failure to store header From: in DMARC: %s, header was '%s'", | |
270 | opendmarc_policy_status_to_str(libdm_status), from_header->text); | |
271 | dmarc_abort = TRUE; | |
4840604e TL |
272 | } |
273 | } | |
274 | ||
c007c974 JH |
275 | /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should |
276 | * instead do this in the ACLs. */ | |
277 | if (!dmarc_abort && !sender_host_authenticated) | |
4840604e | 278 | { |
c007c974 JH |
279 | /* Use the envelope sender domain for this part of DMARC */ |
280 | spf_sender_domain = expand_string(US"$sender_address_domain"); | |
281 | if (!spf_response) | |
4840604e | 282 | { |
c007c974 JH |
283 | /* No spf data means null envelope sender so generate a domain name |
284 | * from the sender_helo_name */ | |
285 | if (!spf_sender_domain) | |
4840604e | 286 | { |
c007c974 JH |
287 | spf_sender_domain = sender_helo_name; |
288 | log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n", | |
289 | spf_sender_domain); | |
290 | DEBUG(D_receive) | |
291 | debug_printf("DMARC using synthesized SPF sender domain = %s\n", | |
292 | spf_sender_domain); | |
4840604e | 293 | } |
c007c974 JH |
294 | dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE; |
295 | dmarc_spf_ares_result = ARES_RESULT_UNKNOWN; | |
296 | origin = DMARC_POLICY_SPF_ORIGIN_HELO; | |
297 | spf_human_readable = US""; | |
4840604e | 298 | } |
c007c974 | 299 | else |
4840604e | 300 | { |
c007c974 JH |
301 | sr = spf_response->result; |
302 | dmarc_spf_result = sr == SPF_RESULT_NEUTRAL ? DMARC_POLICY_SPF_OUTCOME_NONE : | |
303 | sr == SPF_RESULT_PASS ? DMARC_POLICY_SPF_OUTCOME_PASS : | |
304 | sr == SPF_RESULT_FAIL ? DMARC_POLICY_SPF_OUTCOME_FAIL : | |
305 | sr == SPF_RESULT_SOFTFAIL ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL : | |
306 | DMARC_POLICY_SPF_OUTCOME_NONE; | |
307 | dmarc_spf_ares_result = sr == SPF_RESULT_NEUTRAL ? ARES_RESULT_NEUTRAL : | |
308 | sr == SPF_RESULT_PASS ? ARES_RESULT_PASS : | |
309 | sr == SPF_RESULT_FAIL ? ARES_RESULT_FAIL : | |
310 | sr == SPF_RESULT_SOFTFAIL ? ARES_RESULT_SOFTFAIL : | |
311 | sr == SPF_RESULT_NONE ? ARES_RESULT_NONE : | |
312 | sr == SPF_RESULT_TEMPERROR ? ARES_RESULT_TEMPERROR : | |
313 | sr == SPF_RESULT_PERMERROR ? ARES_RESULT_PERMERROR : | |
314 | ARES_RESULT_UNKNOWN; | |
315 | origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM; | |
5903c6ff | 316 | spf_human_readable = US spf_response->header_comment; |
c007c974 JH |
317 | DEBUG(D_receive) |
318 | debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain); | |
4840604e | 319 | } |
c007c974 JH |
320 | if (strcmp( CCS spf_sender_domain, "") == 0) |
321 | dmarc_abort = TRUE; | |
322 | if (!dmarc_abort) | |
4840604e | 323 | { |
c007c974 JH |
324 | libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain, |
325 | dmarc_spf_result, origin, spf_human_readable); | |
326 | if (libdm_status != DMARC_PARSE_OKAY) | |
327 | log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s", | |
328 | opendmarc_policy_status_to_str(libdm_status)); | |
4840604e | 329 | } |
4840604e | 330 | |
c007c974 JH |
331 | /* Now we cycle through the dkim signature results and put into |
332 | * the opendmarc context, further building the DMARC reply. */ | |
333 | sig = dkim_signatures; | |
334 | dkim_history_buffer = US""; | |
335 | while (sig) | |
4840604e | 336 | { |
c007c974 | 337 | int dkim_result, dkim_ares_result, vs, ves; |
6678c382 | 338 | vs = sig->verify_status & ~PDKIM_VERIFY_POLICY; |
c007c974 JH |
339 | ves = sig->verify_ext_status; |
340 | dkim_result = vs == PDKIM_VERIFY_PASS ? DMARC_POLICY_DKIM_OUTCOME_PASS : | |
341 | vs == PDKIM_VERIFY_FAIL ? DMARC_POLICY_DKIM_OUTCOME_FAIL : | |
342 | vs == PDKIM_VERIFY_INVALID ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL : | |
343 | DMARC_POLICY_DKIM_OUTCOME_NONE; | |
5903c6ff | 344 | libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, US sig->domain, |
c007c974 JH |
345 | dkim_result, US""); |
346 | DEBUG(D_receive) | |
347 | debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain); | |
348 | if (libdm_status != DMARC_PARSE_OKAY) | |
349 | log_write(0, LOG_MAIN|LOG_PANIC, | |
350 | "failure to store dkim (%s) for DMARC: %s", | |
351 | sig->domain, opendmarc_policy_status_to_str(libdm_status)); | |
352 | ||
353 | dkim_ares_result = | |
354 | vs == PDKIM_VERIFY_PASS ? ARES_RESULT_PASS : | |
355 | vs == PDKIM_VERIFY_FAIL ? ARES_RESULT_FAIL : | |
356 | vs == PDKIM_VERIFY_NONE ? ARES_RESULT_NONE : | |
357 | vs == PDKIM_VERIFY_INVALID ? | |
358 | ves == PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE ? ARES_RESULT_PERMERROR : | |
359 | ves == PDKIM_VERIFY_INVALID_BUFFER_SIZE ? ARES_RESULT_PERMERROR : | |
78f72498 JH |
360 | ves == PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD ? ARES_RESULT_PERMERROR : |
361 | ves == PDKIM_VERIFY_INVALID_PUBKEY_IMPORT ? ARES_RESULT_PERMERROR : | |
c007c974 JH |
362 | ARES_RESULT_UNKNOWN : |
363 | ARES_RESULT_UNKNOWN; | |
364 | dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer, | |
365 | sig->domain, dkim_ares_result); | |
366 | sig = sig->next; | |
4840604e | 367 | } |
c007c974 JH |
368 | libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US""); |
369 | switch (libdm_status) | |
4840604e | 370 | { |
c007c974 JH |
371 | case DMARC_DNS_ERROR_NXDOMAIN: |
372 | case DMARC_DNS_ERROR_NO_RECORD: | |
373 | DEBUG(D_receive) | |
374 | debug_printf("DMARC no record found for %s\n", header_from_sender); | |
375 | has_dmarc_record = FALSE; | |
376 | break; | |
377 | case DMARC_PARSE_OKAY: | |
378 | DEBUG(D_receive) | |
379 | debug_printf("DMARC record found for %s\n", header_from_sender); | |
380 | break; | |
381 | case DMARC_PARSE_ERROR_BAD_VALUE: | |
382 | DEBUG(D_receive) | |
383 | debug_printf("DMARC record parse error for %s\n", header_from_sender); | |
384 | has_dmarc_record = FALSE; | |
385 | break; | |
386 | default: | |
387 | /* everything else, skip dmarc */ | |
388 | DEBUG(D_receive) | |
389 | debug_printf("DMARC skipping (%d), unsure what to do with %s", | |
390 | libdm_status, from_header->text); | |
391 | has_dmarc_record = FALSE; | |
392 | break; | |
4840604e | 393 | } |
8c8b8274 | 394 | |
c007c974 JH |
395 | /* Store the policy string in an expandable variable. */ |
396 | ||
397 | libdm_status = opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans); | |
398 | for (c = 0; dmarc_policy_description[c].name; c++) | |
399 | if (tmp_ans == dmarc_policy_description[c].value) | |
400 | { | |
401 | dmarc_domain_policy = string_sprintf("%s",dmarc_policy_description[c].name); | |
402 | break; | |
8c8b8274 | 403 | } |
8c8b8274 | 404 | |
c007c974 JH |
405 | /* Can't use exim's string manipulation functions so allocate memory |
406 | * for libopendmarc using its max hostname length definition. */ | |
4840604e | 407 | |
5903c6ff | 408 | uschar *dmarc_domain = US calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar)); |
c007c974 JH |
409 | libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx, |
410 | dmarc_domain, DMARC_MAXHOSTNAMELEN-1); | |
411 | dmarc_used_domain = string_copy(dmarc_domain); | |
412 | free(dmarc_domain); | |
413 | ||
414 | if (libdm_status != DMARC_PARSE_OKAY) | |
415 | log_write(0, LOG_MAIN|LOG_PANIC, | |
416 | "failure to read domainname used for DMARC lookup: %s", | |
417 | opendmarc_policy_status_to_str(libdm_status)); | |
418 | ||
419 | libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx); | |
420 | dmarc_policy = libdm_status; | |
421 | switch(libdm_status) | |
4840604e | 422 | { |
c007c974 JH |
423 | case DMARC_POLICY_ABSENT: /* No DMARC record found */ |
424 | dmarc_status = US"norecord"; | |
425 | dmarc_pass_fail = US"none"; | |
426 | dmarc_status_text = US"No DMARC record"; | |
427 | action = DMARC_RESULT_ACCEPT; | |
428 | break; | |
429 | case DMARC_FROM_DOMAIN_ABSENT: /* No From: domain */ | |
430 | dmarc_status = US"nofrom"; | |
431 | dmarc_pass_fail = US"temperror"; | |
432 | dmarc_status_text = US"No From: domain found"; | |
433 | action = DMARC_RESULT_ACCEPT; | |
434 | break; | |
435 | case DMARC_POLICY_NONE: /* Accept and report */ | |
436 | dmarc_status = US"none"; | |
437 | dmarc_pass_fail = US"none"; | |
438 | dmarc_status_text = US"None, Accept"; | |
439 | action = DMARC_RESULT_ACCEPT; | |
440 | break; | |
441 | case DMARC_POLICY_PASS: /* Explicit accept */ | |
442 | dmarc_status = US"accept"; | |
443 | dmarc_pass_fail = US"pass"; | |
444 | dmarc_status_text = US"Accept"; | |
445 | action = DMARC_RESULT_ACCEPT; | |
446 | break; | |
447 | case DMARC_POLICY_REJECT: /* Explicit reject */ | |
448 | dmarc_status = US"reject"; | |
449 | dmarc_pass_fail = US"fail"; | |
450 | dmarc_status_text = US"Reject"; | |
451 | action = DMARC_RESULT_REJECT; | |
452 | break; | |
453 | case DMARC_POLICY_QUARANTINE: /* Explicit quarantine */ | |
454 | dmarc_status = US"quarantine"; | |
455 | dmarc_pass_fail = US"fail"; | |
456 | dmarc_status_text = US"Quarantine"; | |
457 | action = DMARC_RESULT_QUARANTINE; | |
458 | break; | |
459 | default: | |
460 | dmarc_status = US"temperror"; | |
461 | dmarc_pass_fail = US"temperror"; | |
462 | dmarc_status_text = US"Internal Policy Error"; | |
463 | action = DMARC_RESULT_TEMPFAIL; | |
464 | break; | |
4840604e TL |
465 | } |
466 | ||
c007c974 JH |
467 | libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa); |
468 | if (libdm_status != DMARC_PARSE_OKAY) | |
469 | log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s", | |
470 | opendmarc_policy_status_to_str(libdm_status)); | |
471 | ||
c9cf9ac4 | 472 | if (has_dmarc_record) |
4840604e | 473 | { |
c007c974 JH |
474 | log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s " |
475 | "spf_align=%s dkim_align=%s enforcement='%s'", | |
476 | spf_sender_domain, dmarc_used_domain, | |
477 | (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?"yes":"no", | |
478 | (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?"yes":"no", | |
479 | dmarc_status_text); | |
480 | history_file_status = dmarc_write_history_file(); | |
481 | /* Now get the forensic reporting addresses, if any */ | |
482 | ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1); | |
483 | dmarc_send_forensic_report(ruf); | |
4840604e TL |
484 | } |
485 | } | |
486 | ||
c007c974 | 487 | /* shut down libopendmarc */ |
c9cf9ac4 | 488 | if (dmarc_pctx) |
c007c974 | 489 | (void) opendmarc_policy_connect_shutdown(dmarc_pctx); |
c9cf9ac4 | 490 | if (!dmarc_disable_verify) |
c007c974 | 491 | (void) opendmarc_policy_library_shutdown(&dmarc_ctx); |
4840604e | 492 | |
c007c974 | 493 | return OK; |
4840604e TL |
494 | } |
495 | ||
c007c974 JH |
496 | int |
497 | dmarc_write_history_file() | |
4840604e | 498 | { |
c007c974 JH |
499 | int history_file_fd; |
500 | ssize_t written_len; | |
501 | int tmp_ans; | |
502 | u_char **rua; /* aggregate report addressees */ | |
503 | uschar *history_buffer = NULL; | |
4840604e | 504 | |
c007c974 JH |
505 | if (!dmarc_history_file) |
506 | return DMARC_HIST_DISABLED; | |
507 | history_file_fd = log_create(dmarc_history_file); | |
4840604e | 508 | |
c007c974 | 509 | if (history_file_fd < 0) |
5bfe3b35 | 510 | { |
c007c974 JH |
511 | log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s", |
512 | dmarc_history_file); | |
513 | return DMARC_HIST_FILE_ERR; | |
5bfe3b35 | 514 | } |
4840604e | 515 | |
c007c974 JH |
516 | /* Generate the contents of the history file */ |
517 | history_buffer = string_sprintf( | |
518 | "job %s\nreporter %s\nreceived %ld\nipaddr %s\nfrom %s\nmfrom %s\n", | |
519 | message_id, primary_hostname, time(NULL), sender_host_address, | |
520 | header_from_sender, expand_string(US"$sender_address_domain")); | |
4840604e | 521 | |
c007c974 JH |
522 | if (spf_response) |
523 | history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result); | |
524 | /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */ | |
4840604e | 525 | |
c007c974 JH |
526 | history_buffer = string_sprintf( |
527 | "%s%spdomain %s\npolicy %d\n", | |
528 | history_buffer, dkim_history_buffer, dmarc_used_domain, dmarc_policy); | |
4840604e | 529 | |
c007c974 JH |
530 | if ((rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1))) |
531 | for (tmp_ans = 0; rua[tmp_ans]; tmp_ans++) | |
532 | history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]); | |
533 | else | |
534 | history_buffer = string_sprintf("%srua -\n", history_buffer); | |
4840604e | 535 | |
c007c974 JH |
536 | opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans); |
537 | history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans); | |
4840604e | 538 | |
c007c974 JH |
539 | opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans); |
540 | history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans); | |
4840604e | 541 | |
c007c974 JH |
542 | opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans); |
543 | history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans); | |
4840604e | 544 | |
c007c974 JH |
545 | opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans); |
546 | history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans); | |
547 | ||
548 | opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans); | |
549 | history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans); | |
550 | ||
551 | history_buffer = string_sprintf( | |
552 | "%salign_dkim %d\nalign_spf %d\naction %d\n", | |
553 | history_buffer, da, sa, action); | |
554 | ||
555 | /* Write the contents to the history file */ | |
556 | DEBUG(D_receive) | |
557 | debug_printf("DMARC logging history data for opendmarc reporting%s\n", | |
558 | (host_checking || running_in_test_harness) ? " (not really)" : ""); | |
559 | if (host_checking || running_in_test_harness) | |
4840604e | 560 | { |
c007c974 JH |
561 | DEBUG(D_receive) |
562 | debug_printf("DMARC history data for debugging:\n%s", history_buffer); | |
4840604e | 563 | } |
c007c974 | 564 | else |
4840604e | 565 | { |
c007c974 JH |
566 | written_len = write_to_fd_buf(history_file_fd, |
567 | history_buffer, | |
568 | Ustrlen(history_buffer)); | |
569 | if (written_len == 0) | |
4840604e | 570 | { |
c007c974 JH |
571 | log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s", |
572 | dmarc_history_file); | |
573 | return DMARC_HIST_WRITE_ERR; | |
4840604e | 574 | } |
c007c974 | 575 | (void)close(history_file_fd); |
4840604e | 576 | } |
c007c974 | 577 | return DMARC_HIST_OK; |
4840604e TL |
578 | } |
579 | ||
5bfe3b35 | 580 | |
c007c974 JH |
581 | uschar * |
582 | dmarc_exim_expand_query(int what) | |
4840604e | 583 | { |
c007c974 JH |
584 | if (dmarc_disable_verify || !dmarc_pctx) |
585 | return dmarc_exim_expand_defaults(what); | |
4840604e | 586 | |
5bfe3b35 JH |
587 | if (what == DMARC_VERIFY_STATUS) |
588 | return dmarc_status; | |
589 | return US""; | |
4840604e TL |
590 | } |
591 | ||
c007c974 JH |
592 | uschar * |
593 | dmarc_exim_expand_defaults(int what) | |
4840604e | 594 | { |
5bfe3b35 JH |
595 | if (what == DMARC_VERIFY_STATUS) |
596 | return dmarc_disable_verify ? US"off" : US"none"; | |
597 | return US""; | |
4840604e TL |
598 | } |
599 | ||
c007c974 | 600 | |
c9cf9ac4 JH |
601 | gstring * |
602 | authres_dmarc(gstring * g) | |
603 | { | |
d7b5f2ab JH |
604 | if (dmarc_has_been_checked) |
605 | { | |
606 | g = string_append(g, 2, US";\n\tdmarc=", dmarc_pass_fail); | |
607 | if (header_from_sender) | |
87e9d061 | 608 | g = string_append(g, 2, US" header.from=", header_from_sender); |
d7b5f2ab | 609 | } |
c9cf9ac4 | 610 | return g; |
4840604e TL |
611 | } |
612 | ||
7952eef9 | 613 | # endif /* SUPPORT_SPF */ |
4a8ce2d8 | 614 | #endif /* EXPERIMENTAL_DMARC */ |
c007c974 JH |
615 | /* vi: aw ai sw=2 |
616 | */ |