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"; | |
4840604e | 31 | header_line *from_header = NULL; |
4840604e | 32 | extern SPF_response_t *spf_response; |
620df281 | 33 | int dmarc_spf_ares_result = 0; |
4840604e TL |
34 | uschar *spf_sender_domain = NULL; |
35 | uschar *spf_human_readable = NULL; | |
4840604e TL |
36 | u_char *header_from_sender = NULL; |
37 | int history_file_status = DMARC_HIST_OK; | |
4840604e TL |
38 | uschar *dkim_history_buffer= NULL; |
39 | ||
8c8b8274 TL |
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[] = { | |
f2ed27cf | 46 | /* name value */ |
8c8b8274 TL |
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 | }; | |
4840604e TL |
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 | { | |
40c90bca | 60 | error_block *eb = store_malloc(sizeof(error_block)); |
c007c974 JH |
61 | if (eblock == NULL) |
62 | eblock = eb; | |
63 | else | |
4840604e | 64 | { |
c007c974 JH |
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; | |
4840604e | 70 | } |
c007c974 JH |
71 | eb->text1 = t1; |
72 | eb->text2 = t2; | |
73 | eb->next = NULL; | |
74 | return eblock; | |
4840604e TL |
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 | ||
5bfe3b35 JH |
81 | int |
82 | dmarc_init() | |
4a8ce2d8 | 83 | { |
c007c974 JH |
84 | int *netmask = NULL; /* Ignored */ |
85 | int is_ipv6 = 0; | |
c007c974 JH |
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""; | |
8768d548 | 94 | f.dmarc_has_been_checked = FALSE; |
c007c974 JH |
95 | header_from_sender = NULL; |
96 | spf_sender_domain = NULL; | |
97 | spf_human_readable = NULL; | |
98 | ||
99 | /* ACLs have "control=dmarc_disable_verify" */ | |
8768d548 | 100 | if (f.dmarc_disable_verify == TRUE) |
c007c974 JH |
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) | |
4840604e | 107 | { |
c007c974 JH |
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; | |
4840604e | 111 | } |
590fd9ee | 112 | if (!dmarc_tld_file || !*dmarc_tld_file) |
d7b5f2ab JH |
113 | { |
114 | DEBUG(D_receive) debug_printf("DMARC: no dmarc_tld_file\n"); | |
c007c974 | 115 | dmarc_abort = TRUE; |
d7b5f2ab | 116 | } |
48224640 | 117 | else if (opendmarc_tld_read_file(CS dmarc_tld_file, NULL, NULL, NULL)) |
4840604e | 118 | { |
590fd9ee JH |
119 | log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list '%s': %s", |
120 | dmarc_tld_file, strerror(errno)); | |
c007c974 | 121 | dmarc_abort = TRUE; |
4840604e | 122 | } |
d7b5f2ab JH |
123 | if (!sender_host_address) |
124 | { | |
125 | DEBUG(D_receive) debug_printf("DMARC: no sender_host_address\n"); | |
c007c974 | 126 | dmarc_abort = TRUE; |
d7b5f2ab | 127 | } |
c007c974 JH |
128 | /* This catches locally originated email and startup errors above. */ |
129 | if (!dmarc_abort) | |
4840604e | 130 | { |
c007c974 | 131 | is_ipv6 = string_is_ip_address(sender_host_address, netmask) == 6; |
d7b5f2ab | 132 | if (!(dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6))) |
4840604e | 133 | { |
c007c974 JH |
134 | log_write(0, LOG_MAIN|LOG_PANIC, |
135 | "DMARC failure creating policy context: ip=%s", sender_host_address); | |
136 | dmarc_abort = TRUE; | |
4840604e TL |
137 | } |
138 | } | |
139 | ||
c007c974 | 140 | return OK; |
4840604e TL |
141 | } |
142 | ||
143 | ||
144 | /* dmarc_store_data stores the header data so that subsequent | |
c9cf9ac4 | 145 | dmarc_process can access the data */ |
4840604e | 146 | |
c9cf9ac4 JH |
147 | int |
148 | dmarc_store_data(header_line *hdr) | |
149 | { | |
150 | /* No debug output because would change every test debug output */ | |
8768d548 | 151 | if (!f.dmarc_disable_verify) |
c9cf9ac4 JH |
152 | from_header = hdr; |
153 | return OK; | |
4840604e TL |
154 | } |
155 | ||
156 | ||
72a201e2 TM |
157 | static void |
158 | dmarc_send_forensic_report(u_char **ruf) | |
159 | { | |
72a201e2 TM |
160 | uschar *recipient, *save_sender; |
161 | BOOL send_status = FALSE; | |
162 | error_block *eblock = NULL; | |
163 | FILE *message_file = NULL; | |
164 | ||
165 | /* Earlier ACL does not have *required* control=dmarc_enable_forensic */ | |
8768d548 | 166 | if (!f.dmarc_enable_forensic) |
72a201e2 TM |
167 | return; |
168 | ||
169 | if ( dmarc_policy == DMARC_POLICY_REJECT && action == DMARC_RESULT_REJECT | |
170 | || dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE | |
171 | || dmarc_policy == DMARC_POLICY_NONE && action == DMARC_RESULT_REJECT | |
172 | || dmarc_policy == DMARC_POLICY_NONE && action == DMARC_RESULT_QUARANTINE | |
173 | ) | |
174 | if (ruf) | |
175 | { | |
176 | eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain); | |
177 | eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address); | |
178 | eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full)); | |
179 | eblock = add_to_eblock(eblock, US"SPF Alignment", | |
5455f548 | 180 | sa == DMARC_POLICY_SPF_ALIGNMENT_PASS ? US"yes" : US"no"); |
72a201e2 | 181 | eblock = add_to_eblock(eblock, US"DKIM Alignment", |
5455f548 | 182 | da == DMARC_POLICY_DKIM_ALIGNMENT_PASS ? US"yes" : US"no"); |
72a201e2 | 183 | eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text); |
5455f548 | 184 | |
d7978c0f | 185 | for (int c = 0; ruf[c]; c++) |
72a201e2 TM |
186 | { |
187 | recipient = string_copylc(ruf[c]); | |
188 | if (Ustrncmp(recipient, "mailto:",7)) | |
189 | continue; | |
190 | /* Move to first character past the colon */ | |
191 | recipient += 7; | |
192 | DEBUG(D_receive) | |
193 | debug_printf("DMARC forensic report to %s%s\n", recipient, | |
8768d548 JH |
194 | (host_checking || f.running_in_test_harness) ? " (not really)" : ""); |
195 | if (host_checking || f.running_in_test_harness) | |
72a201e2 TM |
196 | continue; |
197 | ||
5455f548 JH |
198 | if (!moan_send_message(recipient, ERRMESS_DMARC_FORENSIC, eblock, |
199 | header_list, message_file, NULL)) | |
72a201e2 TM |
200 | log_write(0, LOG_MAIN|LOG_PANIC, |
201 | "failure to send DMARC forensic report to %s", recipient); | |
202 | } | |
203 | } | |
204 | } | |
205 | ||
4840604e | 206 | /* dmarc_process adds the envelope sender address to the existing |
c9cf9ac4 JH |
207 | context (if any), retrieves the result, sets up expansion |
208 | strings and evaluates the condition outcome. */ | |
4840604e | 209 | |
c007c974 JH |
210 | int |
211 | dmarc_process() | |
212 | { | |
213 | int sr, origin; /* used in SPF section */ | |
214 | int dmarc_spf_result = 0; /* stores spf into dmarc conn ctx */ | |
215 | int tmp_ans, c; | |
b4757e36 | 216 | pdkim_signature * sig = dkim_signatures; |
c007c974 JH |
217 | BOOL has_dmarc_record = TRUE; |
218 | u_char **ruf; /* forensic report addressees, if called for */ | |
219 | ||
220 | /* ACLs have "control=dmarc_disable_verify" */ | |
8768d548 | 221 | if (f.dmarc_disable_verify) |
c007c974 | 222 | return OK; |
4840604e | 223 | |
c007c974 JH |
224 | /* Store the header From: sender domain for this part of DMARC. |
225 | * If there is no from_header struct, then it's likely this message | |
226 | * is locally generated and relying on fixups to add it. Just skip | |
227 | * the entire DMARC system if we can't find a From: header....or if | |
228 | * there was a previous error. | |
229 | */ | |
d7b5f2ab JH |
230 | if (!from_header) |
231 | { | |
232 | DEBUG(D_receive) debug_printf("DMARC: no From: header\n"); | |
c007c974 | 233 | dmarc_abort = TRUE; |
d7b5f2ab JH |
234 | } |
235 | else if (!dmarc_abort) | |
4840604e | 236 | { |
b4757e36 JH |
237 | uschar * errormsg; |
238 | int dummy, domain; | |
239 | uschar * p; | |
240 | uschar saveend; | |
241 | ||
8768d548 | 242 | f.parse_allow_group = TRUE; |
b4757e36 JH |
243 | p = parse_find_address_end(from_header->text, FALSE); |
244 | saveend = *p; *p = '\0'; | |
245 | if ((header_from_sender = parse_extract_address(from_header->text, &errormsg, | |
246 | &dummy, &dummy, &domain, FALSE))) | |
247 | header_from_sender += domain; | |
248 | *p = saveend; | |
249 | ||
250 | /* The opendmarc library extracts the domain from the email address, but | |
251 | * only try to store it if it's not empty. Otherwise, skip out of DMARC. */ | |
252 | if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0)) | |
253 | dmarc_abort = TRUE; | |
254 | libdm_status = dmarc_abort | |
255 | ? DMARC_PARSE_OKAY | |
256 | : opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender); | |
257 | if (libdm_status != DMARC_PARSE_OKAY) | |
4840604e | 258 | { |
c007c974 JH |
259 | log_write(0, LOG_MAIN|LOG_PANIC, |
260 | "failure to store header From: in DMARC: %s, header was '%s'", | |
261 | opendmarc_policy_status_to_str(libdm_status), from_header->text); | |
262 | dmarc_abort = TRUE; | |
4840604e TL |
263 | } |
264 | } | |
265 | ||
c007c974 JH |
266 | /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should |
267 | * instead do this in the ACLs. */ | |
268 | if (!dmarc_abort && !sender_host_authenticated) | |
4840604e | 269 | { |
b4757e36 JH |
270 | uschar * dmarc_domain; |
271 | ||
c007c974 JH |
272 | /* Use the envelope sender domain for this part of DMARC */ |
273 | spf_sender_domain = expand_string(US"$sender_address_domain"); | |
274 | if (!spf_response) | |
4840604e | 275 | { |
c007c974 JH |
276 | /* No spf data means null envelope sender so generate a domain name |
277 | * from the sender_helo_name */ | |
278 | if (!spf_sender_domain) | |
4840604e | 279 | { |
c007c974 JH |
280 | spf_sender_domain = sender_helo_name; |
281 | log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n", | |
282 | spf_sender_domain); | |
283 | DEBUG(D_receive) | |
284 | debug_printf("DMARC using synthesized SPF sender domain = %s\n", | |
285 | spf_sender_domain); | |
4840604e | 286 | } |
c007c974 JH |
287 | dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE; |
288 | dmarc_spf_ares_result = ARES_RESULT_UNKNOWN; | |
289 | origin = DMARC_POLICY_SPF_ORIGIN_HELO; | |
290 | spf_human_readable = US""; | |
4840604e | 291 | } |
c007c974 | 292 | else |
4840604e | 293 | { |
c007c974 JH |
294 | sr = spf_response->result; |
295 | dmarc_spf_result = sr == SPF_RESULT_NEUTRAL ? DMARC_POLICY_SPF_OUTCOME_NONE : | |
296 | sr == SPF_RESULT_PASS ? DMARC_POLICY_SPF_OUTCOME_PASS : | |
297 | sr == SPF_RESULT_FAIL ? DMARC_POLICY_SPF_OUTCOME_FAIL : | |
298 | sr == SPF_RESULT_SOFTFAIL ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL : | |
299 | DMARC_POLICY_SPF_OUTCOME_NONE; | |
300 | dmarc_spf_ares_result = sr == SPF_RESULT_NEUTRAL ? ARES_RESULT_NEUTRAL : | |
301 | sr == SPF_RESULT_PASS ? ARES_RESULT_PASS : | |
302 | sr == SPF_RESULT_FAIL ? ARES_RESULT_FAIL : | |
303 | sr == SPF_RESULT_SOFTFAIL ? ARES_RESULT_SOFTFAIL : | |
304 | sr == SPF_RESULT_NONE ? ARES_RESULT_NONE : | |
305 | sr == SPF_RESULT_TEMPERROR ? ARES_RESULT_TEMPERROR : | |
306 | sr == SPF_RESULT_PERMERROR ? ARES_RESULT_PERMERROR : | |
307 | ARES_RESULT_UNKNOWN; | |
308 | origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM; | |
5903c6ff | 309 | spf_human_readable = US spf_response->header_comment; |
c007c974 JH |
310 | DEBUG(D_receive) |
311 | debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain); | |
4840604e | 312 | } |
c007c974 JH |
313 | if (strcmp( CCS spf_sender_domain, "") == 0) |
314 | dmarc_abort = TRUE; | |
315 | if (!dmarc_abort) | |
4840604e | 316 | { |
c007c974 JH |
317 | libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain, |
318 | dmarc_spf_result, origin, spf_human_readable); | |
319 | if (libdm_status != DMARC_PARSE_OKAY) | |
320 | log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s", | |
321 | opendmarc_policy_status_to_str(libdm_status)); | |
4840604e | 322 | } |
4840604e | 323 | |
c007c974 JH |
324 | /* Now we cycle through the dkim signature results and put into |
325 | * the opendmarc context, further building the DMARC reply. */ | |
c007c974 JH |
326 | dkim_history_buffer = US""; |
327 | while (sig) | |
4840604e | 328 | { |
c007c974 | 329 | int dkim_result, dkim_ares_result, vs, ves; |
b4757e36 | 330 | |
6678c382 | 331 | vs = sig->verify_status & ~PDKIM_VERIFY_POLICY; |
c007c974 JH |
332 | ves = sig->verify_ext_status; |
333 | dkim_result = vs == PDKIM_VERIFY_PASS ? DMARC_POLICY_DKIM_OUTCOME_PASS : | |
334 | vs == PDKIM_VERIFY_FAIL ? DMARC_POLICY_DKIM_OUTCOME_FAIL : | |
335 | vs == PDKIM_VERIFY_INVALID ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL : | |
336 | DMARC_POLICY_DKIM_OUTCOME_NONE; | |
5903c6ff | 337 | libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, US sig->domain, |
c007c974 JH |
338 | dkim_result, US""); |
339 | DEBUG(D_receive) | |
340 | debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain); | |
341 | if (libdm_status != DMARC_PARSE_OKAY) | |
342 | log_write(0, LOG_MAIN|LOG_PANIC, | |
343 | "failure to store dkim (%s) for DMARC: %s", | |
344 | sig->domain, opendmarc_policy_status_to_str(libdm_status)); | |
345 | ||
346 | dkim_ares_result = | |
347 | vs == PDKIM_VERIFY_PASS ? ARES_RESULT_PASS : | |
348 | vs == PDKIM_VERIFY_FAIL ? ARES_RESULT_FAIL : | |
349 | vs == PDKIM_VERIFY_NONE ? ARES_RESULT_NONE : | |
350 | vs == PDKIM_VERIFY_INVALID ? | |
351 | ves == PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE ? ARES_RESULT_PERMERROR : | |
352 | ves == PDKIM_VERIFY_INVALID_BUFFER_SIZE ? ARES_RESULT_PERMERROR : | |
78f72498 JH |
353 | ves == PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD ? ARES_RESULT_PERMERROR : |
354 | ves == PDKIM_VERIFY_INVALID_PUBKEY_IMPORT ? ARES_RESULT_PERMERROR : | |
c007c974 JH |
355 | ARES_RESULT_UNKNOWN : |
356 | ARES_RESULT_UNKNOWN; | |
357 | dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer, | |
358 | sig->domain, dkim_ares_result); | |
359 | sig = sig->next; | |
4840604e | 360 | } |
c007c974 JH |
361 | libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US""); |
362 | switch (libdm_status) | |
4840604e | 363 | { |
c007c974 JH |
364 | case DMARC_DNS_ERROR_NXDOMAIN: |
365 | case DMARC_DNS_ERROR_NO_RECORD: | |
366 | DEBUG(D_receive) | |
367 | debug_printf("DMARC no record found for %s\n", header_from_sender); | |
368 | has_dmarc_record = FALSE; | |
369 | break; | |
370 | case DMARC_PARSE_OKAY: | |
371 | DEBUG(D_receive) | |
372 | debug_printf("DMARC record found for %s\n", header_from_sender); | |
373 | break; | |
374 | case DMARC_PARSE_ERROR_BAD_VALUE: | |
375 | DEBUG(D_receive) | |
376 | debug_printf("DMARC record parse error for %s\n", header_from_sender); | |
377 | has_dmarc_record = FALSE; | |
378 | break; | |
379 | default: | |
380 | /* everything else, skip dmarc */ | |
381 | DEBUG(D_receive) | |
382 | debug_printf("DMARC skipping (%d), unsure what to do with %s", | |
383 | libdm_status, from_header->text); | |
384 | has_dmarc_record = FALSE; | |
385 | break; | |
4840604e | 386 | } |
8c8b8274 | 387 | |
c007c974 JH |
388 | /* Store the policy string in an expandable variable. */ |
389 | ||
390 | libdm_status = opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans); | |
391 | for (c = 0; dmarc_policy_description[c].name; c++) | |
392 | if (tmp_ans == dmarc_policy_description[c].value) | |
393 | { | |
394 | dmarc_domain_policy = string_sprintf("%s",dmarc_policy_description[c].name); | |
395 | break; | |
8c8b8274 | 396 | } |
8c8b8274 | 397 | |
c007c974 | 398 | /* Can't use exim's string manipulation functions so allocate memory |
b4757e36 | 399 | for libopendmarc using its max hostname length definition. */ |
4840604e | 400 | |
b4757e36 | 401 | dmarc_domain = US calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar)); |
c007c974 JH |
402 | libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx, |
403 | dmarc_domain, DMARC_MAXHOSTNAMELEN-1); | |
404 | dmarc_used_domain = string_copy(dmarc_domain); | |
405 | free(dmarc_domain); | |
406 | ||
407 | if (libdm_status != DMARC_PARSE_OKAY) | |
408 | log_write(0, LOG_MAIN|LOG_PANIC, | |
409 | "failure to read domainname used for DMARC lookup: %s", | |
410 | opendmarc_policy_status_to_str(libdm_status)); | |
411 | ||
b4757e36 | 412 | dmarc_policy = libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx); |
c007c974 | 413 | switch(libdm_status) |
4840604e | 414 | { |
c007c974 JH |
415 | case DMARC_POLICY_ABSENT: /* No DMARC record found */ |
416 | dmarc_status = US"norecord"; | |
417 | dmarc_pass_fail = US"none"; | |
418 | dmarc_status_text = US"No DMARC record"; | |
419 | action = DMARC_RESULT_ACCEPT; | |
420 | break; | |
421 | case DMARC_FROM_DOMAIN_ABSENT: /* No From: domain */ | |
422 | dmarc_status = US"nofrom"; | |
423 | dmarc_pass_fail = US"temperror"; | |
424 | dmarc_status_text = US"No From: domain found"; | |
425 | action = DMARC_RESULT_ACCEPT; | |
426 | break; | |
427 | case DMARC_POLICY_NONE: /* Accept and report */ | |
428 | dmarc_status = US"none"; | |
429 | dmarc_pass_fail = US"none"; | |
430 | dmarc_status_text = US"None, Accept"; | |
431 | action = DMARC_RESULT_ACCEPT; | |
432 | break; | |
433 | case DMARC_POLICY_PASS: /* Explicit accept */ | |
434 | dmarc_status = US"accept"; | |
435 | dmarc_pass_fail = US"pass"; | |
436 | dmarc_status_text = US"Accept"; | |
437 | action = DMARC_RESULT_ACCEPT; | |
438 | break; | |
439 | case DMARC_POLICY_REJECT: /* Explicit reject */ | |
440 | dmarc_status = US"reject"; | |
441 | dmarc_pass_fail = US"fail"; | |
442 | dmarc_status_text = US"Reject"; | |
443 | action = DMARC_RESULT_REJECT; | |
444 | break; | |
445 | case DMARC_POLICY_QUARANTINE: /* Explicit quarantine */ | |
446 | dmarc_status = US"quarantine"; | |
447 | dmarc_pass_fail = US"fail"; | |
448 | dmarc_status_text = US"Quarantine"; | |
449 | action = DMARC_RESULT_QUARANTINE; | |
450 | break; | |
451 | default: | |
452 | dmarc_status = US"temperror"; | |
453 | dmarc_pass_fail = US"temperror"; | |
454 | dmarc_status_text = US"Internal Policy Error"; | |
455 | action = DMARC_RESULT_TEMPFAIL; | |
456 | break; | |
4840604e TL |
457 | } |
458 | ||
c007c974 JH |
459 | libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa); |
460 | if (libdm_status != DMARC_PARSE_OKAY) | |
461 | log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s", | |
462 | opendmarc_policy_status_to_str(libdm_status)); | |
463 | ||
c9cf9ac4 | 464 | if (has_dmarc_record) |
4840604e | 465 | { |
c007c974 JH |
466 | log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s " |
467 | "spf_align=%s dkim_align=%s enforcement='%s'", | |
468 | spf_sender_domain, dmarc_used_domain, | |
d341f2a2 JH |
469 | sa==DMARC_POLICY_SPF_ALIGNMENT_PASS ?"yes":"no", |
470 | da==DMARC_POLICY_DKIM_ALIGNMENT_PASS ?"yes":"no", | |
c007c974 JH |
471 | dmarc_status_text); |
472 | history_file_status = dmarc_write_history_file(); | |
473 | /* Now get the forensic reporting addresses, if any */ | |
474 | ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1); | |
475 | dmarc_send_forensic_report(ruf); | |
4840604e TL |
476 | } |
477 | } | |
478 | ||
c007c974 | 479 | /* shut down libopendmarc */ |
c9cf9ac4 | 480 | if (dmarc_pctx) |
c007c974 | 481 | (void) opendmarc_policy_connect_shutdown(dmarc_pctx); |
8768d548 | 482 | if (!f.dmarc_disable_verify) |
c007c974 | 483 | (void) opendmarc_policy_library_shutdown(&dmarc_ctx); |
4840604e | 484 | |
c007c974 | 485 | return OK; |
4840604e TL |
486 | } |
487 | ||
d341f2a2 | 488 | static int |
c007c974 | 489 | dmarc_write_history_file() |
4840604e | 490 | { |
c007c974 JH |
491 | int history_file_fd; |
492 | ssize_t written_len; | |
493 | int tmp_ans; | |
494 | u_char **rua; /* aggregate report addressees */ | |
495 | uschar *history_buffer = NULL; | |
4840604e | 496 | |
c007c974 | 497 | if (!dmarc_history_file) |
d341f2a2 JH |
498 | { |
499 | DEBUG(D_receive) debug_printf("DMARC history file not set\n"); | |
c007c974 | 500 | return DMARC_HIST_DISABLED; |
d341f2a2 | 501 | } |
c007c974 | 502 | history_file_fd = log_create(dmarc_history_file); |
4840604e | 503 | |
c007c974 | 504 | if (history_file_fd < 0) |
5bfe3b35 | 505 | { |
c007c974 JH |
506 | log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s", |
507 | dmarc_history_file); | |
508 | return DMARC_HIST_FILE_ERR; | |
5bfe3b35 | 509 | } |
4840604e | 510 | |
c007c974 JH |
511 | /* Generate the contents of the history file */ |
512 | history_buffer = string_sprintf( | |
513 | "job %s\nreporter %s\nreceived %ld\nipaddr %s\nfrom %s\nmfrom %s\n", | |
514 | message_id, primary_hostname, time(NULL), sender_host_address, | |
515 | header_from_sender, expand_string(US"$sender_address_domain")); | |
4840604e | 516 | |
c007c974 JH |
517 | if (spf_response) |
518 | history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result); | |
519 | /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */ | |
4840604e | 520 | |
c007c974 JH |
521 | history_buffer = string_sprintf( |
522 | "%s%spdomain %s\npolicy %d\n", | |
523 | history_buffer, dkim_history_buffer, dmarc_used_domain, dmarc_policy); | |
4840604e | 524 | |
c007c974 JH |
525 | if ((rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1))) |
526 | for (tmp_ans = 0; rua[tmp_ans]; tmp_ans++) | |
527 | history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]); | |
528 | else | |
529 | history_buffer = string_sprintf("%srua -\n", history_buffer); | |
4840604e | 530 | |
c007c974 JH |
531 | opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans); |
532 | history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans); | |
4840604e | 533 | |
c007c974 JH |
534 | opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans); |
535 | history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans); | |
4840604e | 536 | |
c007c974 JH |
537 | opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans); |
538 | history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans); | |
4840604e | 539 | |
c007c974 JH |
540 | opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans); |
541 | history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans); | |
542 | ||
543 | opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans); | |
544 | history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans); | |
545 | ||
546 | history_buffer = string_sprintf( | |
547 | "%salign_dkim %d\nalign_spf %d\naction %d\n", | |
548 | history_buffer, da, sa, action); | |
549 | ||
550 | /* Write the contents to the history file */ | |
551 | DEBUG(D_receive) | |
552 | debug_printf("DMARC logging history data for opendmarc reporting%s\n", | |
8768d548 JH |
553 | (host_checking || f.running_in_test_harness) ? " (not really)" : ""); |
554 | if (host_checking || f.running_in_test_harness) | |
4840604e | 555 | { |
c007c974 JH |
556 | DEBUG(D_receive) |
557 | debug_printf("DMARC history data for debugging:\n%s", history_buffer); | |
4840604e | 558 | } |
c007c974 | 559 | else |
4840604e | 560 | { |
c007c974 JH |
561 | written_len = write_to_fd_buf(history_file_fd, |
562 | history_buffer, | |
563 | Ustrlen(history_buffer)); | |
564 | if (written_len == 0) | |
4840604e | 565 | { |
c007c974 JH |
566 | log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s", |
567 | dmarc_history_file); | |
568 | return DMARC_HIST_WRITE_ERR; | |
4840604e | 569 | } |
c007c974 | 570 | (void)close(history_file_fd); |
4840604e | 571 | } |
c007c974 | 572 | return DMARC_HIST_OK; |
4840604e TL |
573 | } |
574 | ||
5bfe3b35 | 575 | |
c007c974 JH |
576 | uschar * |
577 | dmarc_exim_expand_query(int what) | |
4840604e | 578 | { |
8768d548 | 579 | if (f.dmarc_disable_verify || !dmarc_pctx) |
c007c974 | 580 | return dmarc_exim_expand_defaults(what); |
4840604e | 581 | |
5bfe3b35 JH |
582 | if (what == DMARC_VERIFY_STATUS) |
583 | return dmarc_status; | |
584 | return US""; | |
4840604e TL |
585 | } |
586 | ||
c007c974 JH |
587 | uschar * |
588 | dmarc_exim_expand_defaults(int what) | |
4840604e | 589 | { |
5bfe3b35 | 590 | if (what == DMARC_VERIFY_STATUS) |
8768d548 | 591 | return f.dmarc_disable_verify ? US"off" : US"none"; |
5bfe3b35 | 592 | return US""; |
4840604e TL |
593 | } |
594 | ||
c007c974 | 595 | |
c9cf9ac4 JH |
596 | gstring * |
597 | authres_dmarc(gstring * g) | |
598 | { | |
8768d548 | 599 | if (f.dmarc_has_been_checked) |
d7b5f2ab JH |
600 | { |
601 | g = string_append(g, 2, US";\n\tdmarc=", dmarc_pass_fail); | |
602 | if (header_from_sender) | |
87e9d061 | 603 | g = string_append(g, 2, US" header.from=", header_from_sender); |
d7b5f2ab | 604 | } |
c9cf9ac4 | 605 | return g; |
4840604e TL |
606 | } |
607 | ||
7952eef9 | 608 | # endif /* SUPPORT_SPF */ |
4a8ce2d8 | 609 | #endif /* EXPERIMENTAL_DMARC */ |
c007c974 JH |
610 | /* vi: aw ai sw=2 |
611 | */ |