1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge, 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for DKIM support. Other DKIM relevant code is in
9 receive.c, transport.c and transports/smtp.c */
15 # include "pdkim/pdkim.h"
18 # include "macro_predef.h"
23 builtin_macro_create_var(US"_DKIM_SIGN_HEADERS", US PDKIM_DEFAULT_SIGN_HEADERS);
25 # else /*!MACRO_PREDEF*/
29 pdkim_ctx dkim_sign_ctx;
31 int dkim_verify_oldpool;
32 pdkim_ctx *dkim_verify_ctx = NULL;
33 pdkim_signature *dkim_cur_sig = NULL;
34 static const uschar * dkim_collect_error = NULL;
36 #define DKIM_MAX_SIGNATURES 20
40 /*XXX the caller only uses the first record if we return multiple.
44 dkim_exim_query_dns_txt(uschar * name)
51 lookup_dnssec_authenticated = NULL;
52 if (dns_lookup(&dnsa, name, T_TXT, NULL) != DNS_SUCCEED)
53 return NULL; /*XXX better error detail? logging? */
55 /* Search for TXT record */
57 for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
59 rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
60 if (rr->type == T_TXT)
64 /* Copy record content to the answer buffer */
66 while (rr_offset < rr->size)
68 uschar len = rr->data[rr_offset++];
70 g = string_catn(g, US(rr->data + rr_offset), len);
71 if (g->ptr >= PDKIM_DNS_TXT_MAX_RECLEN)
77 /* check if this looks like a DKIM record */
78 if (Ustrncmp(g->s, "v=", 2) != 0 || strncasecmp(CS g->s, "v=dkim", 6) == 0)
80 gstring_reset_unused(g);
81 return string_from_gstring(g);
84 if (g) g->ptr = 0; /* overwrite previous record */
88 if (g) store_reset(g);
89 return NULL; /*XXX better error detail? logging? */
102 dkim_exim_verify_init(BOOL dot_stuffing)
104 /* There is a store-reset between header & body reception
105 so cannot use the main pool. Any allocs done by Exim
106 memory-handling must use the perm pool. */
108 dkim_verify_oldpool = store_pool;
109 store_pool = POOL_PERM;
111 /* Free previous context if there is one */
114 pdkim_free_ctx(dkim_verify_ctx);
116 /* Create new context */
118 dkim_verify_ctx = pdkim_init_verify(&dkim_exim_query_dns_txt, dot_stuffing);
119 dkim_collect_input = dkim_verify_ctx ? DKIM_MAX_SIGNATURES : 0;
120 dkim_collect_error = NULL;
122 /* Start feed up with any cached data */
125 store_pool = dkim_verify_oldpool;
130 dkim_exim_verify_feed(uschar * data, int len)
134 store_pool = POOL_PERM;
135 if ( dkim_collect_input
136 && (rc = pdkim_feed(dkim_verify_ctx, data, len)) != PDKIM_OK)
138 dkim_collect_error = pdkim_errstr(rc);
139 log_write(0, LOG_MAIN,
140 "DKIM: validation error: %.100s", dkim_collect_error);
141 dkim_collect_input = 0;
143 store_pool = dkim_verify_oldpool;
147 /* Log the result for the given signature */
149 dkim_exim_verify_log_sig(pdkim_signature * sig)
156 /* Remember the domain for the first pass result */
158 if ( !dkim_verify_overall
159 && dkim_verify_status
160 ? Ustrcmp(dkim_verify_status, US"pass") == 0
161 : sig->verify_status == PDKIM_VERIFY_PASS
163 dkim_verify_overall = string_copy(sig->domain);
165 /* Rewrite the sig result if the ACL overrode it. This is only
166 needed because the DMARC code (sigh) peeks at the dkim sigs.
167 Mark the sig for this having been done. */
169 if ( dkim_verify_status
170 && ( dkim_verify_status != dkim_exim_expand_query(DKIM_VERIFY_STATUS)
171 || dkim_verify_reason != dkim_exim_expand_query(DKIM_VERIFY_REASON)
173 { /* overridden by ACL */
174 sig->verify_ext_status = -1;
175 if (Ustrcmp(dkim_verify_status, US"fail") == 0)
176 sig->verify_status = PDKIM_VERIFY_POLICY | PDKIM_VERIFY_FAIL;
177 else if (Ustrcmp(dkim_verify_status, US"invalid") == 0)
178 sig->verify_status = PDKIM_VERIFY_POLICY | PDKIM_VERIFY_INVALID;
179 else if (Ustrcmp(dkim_verify_status, US"none") == 0)
180 sig->verify_status = PDKIM_VERIFY_POLICY | PDKIM_VERIFY_NONE;
181 else if (Ustrcmp(dkim_verify_status, US"pass") == 0)
182 sig->verify_status = PDKIM_VERIFY_POLICY | PDKIM_VERIFY_PASS;
184 sig->verify_status = -1;
187 if (!LOGGING(dkim_verbose)) return;
190 logmsg = string_catn(NULL, US"DKIM: ", 6);
191 if (!(s = sig->domain)) s = US"<UNSET>";
192 logmsg = string_append(logmsg, 2, "d=", s);
193 if (!(s = sig->selector)) s = US"<UNSET>";
194 logmsg = string_append(logmsg, 2, " s=", s);
195 logmsg = string_fmt_append(logmsg, " c=%s/%s a=%s b=" SIZE_T_FMT,
196 sig->canon_headers == PDKIM_CANON_SIMPLE ? "simple" : "relaxed",
197 sig->canon_body == PDKIM_CANON_SIMPLE ? "simple" : "relaxed",
198 dkim_sig_to_a_tag(sig),
199 (int)sig->sighash.len > -1 ? sig->sighash.len * 8 : (size_t)0);
200 if ((s= sig->identity)) logmsg = string_append(logmsg, 2, " i=", s);
201 if (sig->created > 0) logmsg = string_fmt_append(logmsg, " t=%lu",
203 if (sig->expires > 0) logmsg = string_fmt_append(logmsg, " x=%lu",
205 if (sig->bodylength > -1) logmsg = string_fmt_append(logmsg, " l=%lu",
208 if (sig->verify_status & PDKIM_VERIFY_POLICY)
209 logmsg = string_append(logmsg, 5,
210 US" [", dkim_verify_status, US" - ", dkim_verify_reason, US"]");
212 switch (sig->verify_status)
214 case PDKIM_VERIFY_NONE:
215 logmsg = string_cat(logmsg, US" [not verified]");
218 case PDKIM_VERIFY_INVALID:
219 logmsg = string_cat(logmsg, US" [invalid - ");
220 switch (sig->verify_ext_status)
222 case PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE:
223 logmsg = string_cat(logmsg,
224 US"public key record (currently?) unavailable]");
227 case PDKIM_VERIFY_INVALID_BUFFER_SIZE:
228 logmsg = string_cat(logmsg, US"overlong public key record]");
231 case PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD:
232 case PDKIM_VERIFY_INVALID_PUBKEY_IMPORT:
233 logmsg = string_cat(logmsg, US"syntax error in public key record]");
236 case PDKIM_VERIFY_INVALID_SIGNATURE_ERROR:
237 logmsg = string_cat(logmsg, US"signature tag missing or invalid]");
240 case PDKIM_VERIFY_INVALID_DKIM_VERSION:
241 logmsg = string_cat(logmsg, US"unsupported DKIM version]");
245 logmsg = string_cat(logmsg, US"unspecified problem]");
249 case PDKIM_VERIFY_FAIL:
250 logmsg = string_cat(logmsg, US" [verification failed - ");
251 switch (sig->verify_ext_status)
253 case PDKIM_VERIFY_FAIL_BODY:
254 logmsg = string_cat(logmsg,
255 US"body hash mismatch (body probably modified in transit)]");
258 case PDKIM_VERIFY_FAIL_MESSAGE:
259 logmsg = string_cat(logmsg,
260 US"signature did not verify "
261 "(headers probably modified in transit)]");
265 logmsg = string_cat(logmsg, US"unspecified reason]");
269 case PDKIM_VERIFY_PASS:
270 logmsg = string_cat(logmsg, US" [verification succeeded]");
274 log_write(0, LOG_MAIN, "%s", string_from_gstring(logmsg));
279 /* Log a line for each signature */
281 dkim_exim_verify_log_all(void)
283 pdkim_signature * sig;
284 for (sig = dkim_signatures; sig; sig = sig->next) dkim_exim_verify_log_sig(sig);
289 dkim_exim_verify_finish(void)
291 pdkim_signature * sig;
294 const uschar * errstr = NULL;
296 store_pool = POOL_PERM;
298 /* Delete eventual previous signature chain */
301 dkim_signatures = NULL;
303 if (dkim_collect_error)
305 log_write(0, LOG_MAIN,
306 "DKIM: Error during validation, disabling signature verification: %.100s",
308 f.dkim_disable_verify = TRUE;
312 dkim_collect_input = 0;
314 /* Finish DKIM operation and fetch link to signatures chain */
316 rc = pdkim_feed_finish(dkim_verify_ctx, (pdkim_signature **)&dkim_signatures,
318 if (rc != PDKIM_OK && errstr)
319 log_write(0, LOG_MAIN, "DKIM: validation error: %s", errstr);
321 /* Build a colon-separated list of signing domains (and identities, if present) in dkim_signers */
323 for (sig = dkim_signatures; sig; sig = sig->next)
325 if (sig->domain) g = string_append_listele(g, ':', sig->domain);
326 if (sig->identity) g = string_append_listele(g, ':', sig->identity);
329 if (g) dkim_signers = g->s;
332 store_pool = dkim_verify_oldpool;
337 /* Args as per dkim_exim_acl_run() below */
339 dkim_acl_call(uschar * id, gstring ** res_ptr,
340 uschar ** user_msgptr, uschar ** log_msgptr)
344 debug_printf("calling acl_smtp_dkim for dkim_cur_signer='%s'\n", id);
346 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim, user_msgptr, log_msgptr);
347 dkim_exim_verify_log_sig(dkim_cur_sig);
348 *res_ptr = string_append_listele(*res_ptr, ':', dkim_verify_status);
354 /* For the given identity, run the DKIM ACL once for each matching signature.
357 id Identity to look for in dkim signatures
358 res_ptr ptr to growable string-list of status results,
359 appended to per ACL run
360 user_msgptr where to put a user error (for SMTP response)
361 log_msgptr where to put a logging message (not for SMTP response)
363 Returns: OK access is granted by an ACCEPT verb
364 DISCARD access is granted by a DISCARD verb
365 FAIL access is denied
366 FAIL_DROP access is denied; drop the connection
367 DEFER can't tell at the moment
372 dkim_exim_acl_run(uschar * id, gstring ** res_ptr,
373 uschar ** user_msgptr, uschar ** log_msgptr)
375 pdkim_signature * sig;
379 dkim_verify_status = US"none";
380 dkim_verify_reason = US"";
381 dkim_cur_signer = id;
383 if (f.dkim_disable_verify || !id || !dkim_verify_ctx)
386 /* Find signatures to run ACL on */
388 for (sig = dkim_signatures; sig; sig = sig->next)
389 if ( (cmp_val = Ustrchr(id, '@') != NULL ? US sig->identity : US sig->domain)
390 && strcmpic(cmp_val, id) == 0
393 /* The "dkim_domain" and "dkim_selector" expansion variables have
394 related globals, since they are used in the signing code too.
395 Instead of inventing separate names for verification, we set
396 them here. This is easy since a domain and selector is guaranteed
397 to be in a signature. The other dkim_* expansion items are
398 dynamically fetched from dkim_cur_sig at expansion time (see
399 dkim_exim_expand_query() below). */
402 dkim_signing_domain = US sig->domain;
403 dkim_signing_selector = US sig->selector;
404 dkim_key_length = sig->sighash.len * 8;
406 /* These two return static strings, so we can compare the addr
407 later to see if the ACL overwrote them. Check that when logging */
409 dkim_verify_status = dkim_exim_expand_query(DKIM_VERIFY_STATUS);
410 dkim_verify_reason = dkim_exim_expand_query(DKIM_VERIFY_REASON);
412 if ((rc = dkim_acl_call(id, res_ptr, user_msgptr, log_msgptr)) != OK)
419 /* No matching sig found. Call ACL once anyway. */
422 return dkim_acl_call(id, res_ptr, user_msgptr, log_msgptr);
427 dkim_exim_expand_defaults(int what)
431 case DKIM_ALGO: return US"";
432 case DKIM_BODYLENGTH: return US"9999999999999";
433 case DKIM_CANON_BODY: return US"";
434 case DKIM_CANON_HEADERS: return US"";
435 case DKIM_COPIEDHEADERS: return US"";
436 case DKIM_CREATED: return US"0";
437 case DKIM_EXPIRES: return US"9999999999999";
438 case DKIM_HEADERNAMES: return US"";
439 case DKIM_IDENTITY: return US"";
440 case DKIM_KEY_GRANULARITY: return US"*";
441 case DKIM_KEY_SRVTYPE: return US"*";
442 case DKIM_KEY_NOTES: return US"";
443 case DKIM_KEY_TESTING: return US"0";
444 case DKIM_NOSUBDOMAINS: return US"0";
445 case DKIM_VERIFY_STATUS: return US"none";
446 case DKIM_VERIFY_REASON: return US"";
447 default: return US"";
453 dkim_exim_expand_query(int what)
455 if (!dkim_verify_ctx || f.dkim_disable_verify || !dkim_cur_sig)
456 return dkim_exim_expand_defaults(what);
461 return dkim_sig_to_a_tag(dkim_cur_sig);
463 case DKIM_BODYLENGTH:
464 return dkim_cur_sig->bodylength >= 0
465 ? string_sprintf("%ld", dkim_cur_sig->bodylength)
466 : dkim_exim_expand_defaults(what);
468 case DKIM_CANON_BODY:
469 switch (dkim_cur_sig->canon_body)
471 case PDKIM_CANON_RELAXED: return US"relaxed";
472 case PDKIM_CANON_SIMPLE:
473 default: return US"simple";
476 case DKIM_CANON_HEADERS:
477 switch (dkim_cur_sig->canon_headers)
479 case PDKIM_CANON_RELAXED: return US"relaxed";
480 case PDKIM_CANON_SIMPLE:
481 default: return US"simple";
484 case DKIM_COPIEDHEADERS:
485 return dkim_cur_sig->copiedheaders
486 ? US dkim_cur_sig->copiedheaders : dkim_exim_expand_defaults(what);
489 return dkim_cur_sig->created > 0
490 ? string_sprintf("%lu", dkim_cur_sig->created)
491 : dkim_exim_expand_defaults(what);
494 return dkim_cur_sig->expires > 0
495 ? string_sprintf("%lu", dkim_cur_sig->expires)
496 : dkim_exim_expand_defaults(what);
498 case DKIM_HEADERNAMES:
499 return dkim_cur_sig->headernames
500 ? dkim_cur_sig->headernames : dkim_exim_expand_defaults(what);
503 return dkim_cur_sig->identity
504 ? US dkim_cur_sig->identity : dkim_exim_expand_defaults(what);
506 case DKIM_KEY_GRANULARITY:
507 return dkim_cur_sig->pubkey
508 ? dkim_cur_sig->pubkey->granularity
509 ? US dkim_cur_sig->pubkey->granularity
510 : dkim_exim_expand_defaults(what)
511 : dkim_exim_expand_defaults(what);
513 case DKIM_KEY_SRVTYPE:
514 return dkim_cur_sig->pubkey
515 ? dkim_cur_sig->pubkey->srvtype
516 ? US dkim_cur_sig->pubkey->srvtype
517 : dkim_exim_expand_defaults(what)
518 : dkim_exim_expand_defaults(what);
521 return dkim_cur_sig->pubkey
522 ? dkim_cur_sig->pubkey->notes
523 ? US dkim_cur_sig->pubkey->notes
524 : dkim_exim_expand_defaults(what)
525 : dkim_exim_expand_defaults(what);
527 case DKIM_KEY_TESTING:
528 return dkim_cur_sig->pubkey
529 ? dkim_cur_sig->pubkey->testing
531 : dkim_exim_expand_defaults(what)
532 : dkim_exim_expand_defaults(what);
534 case DKIM_NOSUBDOMAINS:
535 return dkim_cur_sig->pubkey
536 ? dkim_cur_sig->pubkey->no_subdomaining
538 : dkim_exim_expand_defaults(what)
539 : dkim_exim_expand_defaults(what);
541 case DKIM_VERIFY_STATUS:
542 switch (dkim_cur_sig->verify_status)
544 case PDKIM_VERIFY_INVALID: return US"invalid";
545 case PDKIM_VERIFY_FAIL: return US"fail";
546 case PDKIM_VERIFY_PASS: return US"pass";
547 case PDKIM_VERIFY_NONE:
548 default: return US"none";
551 case DKIM_VERIFY_REASON:
552 switch (dkim_cur_sig->verify_ext_status)
554 case PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE:
555 return US"pubkey_unavailable";
556 case PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD:return US"pubkey_dns_syntax";
557 case PDKIM_VERIFY_INVALID_PUBKEY_IMPORT: return US"pubkey_der_syntax";
558 case PDKIM_VERIFY_FAIL_BODY: return US"bodyhash_mismatch";
559 case PDKIM_VERIFY_FAIL_MESSAGE: return US"signature_incorrect";
569 dkim_exim_sign_init(void)
571 int old_pool = store_pool;
572 store_pool = POOL_MAIN;
573 pdkim_init_context(&dkim_sign_ctx, FALSE, &dkim_exim_query_dns_txt);
574 store_pool = old_pool;
578 /* Generate signatures for the given file.
579 If a prefix is given, prepend it to the file for the calculations.
582 NULL: error; error string written
583 string: signature header(s), or a zero-length string (not an error)
587 dkim_exim_sign(int fd, off_t off, uschar * prefix,
588 struct ob_dkim * dkim, const uschar ** errstr)
590 const uschar * dkim_domain = NULL;
592 gstring * seen_doms = NULL;
593 pdkim_signature * sig;
599 int old_pool = store_pool;
603 if (dkim->dot_stuffed)
604 dkim_sign_ctx.flags |= PDKIM_DOT_TERM;
606 store_pool = POOL_MAIN;
608 if ((s = dkim->dkim_domain) && !(dkim_domain = expand_cstring(s)))
609 /* expansion error, do not send message. */
610 { errwhen = US"dkim_domain"; goto expand_bad; }
612 /* Set $dkim_domain expansion variable to each unique domain in list. */
615 while ((dkim_signing_domain = string_nextinlist(&dkim_domain, &sep, NULL, 0)))
617 const uschar * dkim_sel;
620 if (dkim_signing_domain[0] == '\0')
623 /* Only sign once for each domain, no matter how often it
624 appears in the expanded list. */
626 if (match_isinlist(dkim_signing_domain, CUSS &seen_doms,
627 0, NULL, NULL, MCL_STRING, TRUE, NULL) == OK)
630 seen_doms = string_append_listele(seen_doms, ':', dkim_signing_domain);
632 /* Set $dkim_selector expansion variable to each selector in list,
635 if (!(dkim_sel = expand_string(dkim->dkim_selector)))
636 { errwhen = US"dkim_selector"; goto expand_bad; }
638 while ((dkim_signing_selector = string_nextinlist(&dkim_sel, &sel_sep,
641 uschar * dkim_canon_expanded;
643 uschar * dkim_sign_headers_expanded = NULL;
644 uschar * dkim_private_key_expanded;
645 uschar * dkim_hash_expanded;
646 uschar * dkim_identity_expanded = NULL;
647 uschar * dkim_timestamps_expanded = NULL;
648 unsigned long tval = 0, xval = 0;
650 /* Get canonicalization to use */
652 dkim_canon_expanded = dkim->dkim_canon
653 ? expand_string(dkim->dkim_canon) : US"relaxed";
654 if (!dkim_canon_expanded) /* expansion error, do not send message. */
655 { errwhen = US"dkim_canon"; goto expand_bad; }
657 if (Ustrcmp(dkim_canon_expanded, "relaxed") == 0)
658 pdkim_canon = PDKIM_CANON_RELAXED;
659 else if (Ustrcmp(dkim_canon_expanded, "simple") == 0)
660 pdkim_canon = PDKIM_CANON_SIMPLE;
663 log_write(0, LOG_MAIN,
664 "DKIM: unknown canonicalization method '%s', defaulting to 'relaxed'.\n",
665 dkim_canon_expanded);
666 pdkim_canon = PDKIM_CANON_RELAXED;
669 if ( dkim->dkim_sign_headers
670 && !(dkim_sign_headers_expanded = expand_string(dkim->dkim_sign_headers)))
671 { errwhen = US"dkim_sign_header"; goto expand_bad; }
672 /* else pass NULL, which means default header list */
674 /* Get private key to use. */
676 if (!(dkim_private_key_expanded = expand_string(dkim->dkim_private_key)))
677 { errwhen = US"dkim_private_key"; goto expand_bad; }
679 if ( Ustrlen(dkim_private_key_expanded) == 0
680 || Ustrcmp(dkim_private_key_expanded, "0") == 0
681 || Ustrcmp(dkim_private_key_expanded, "false") == 0
683 continue; /* don't sign, but no error */
685 if ( dkim_private_key_expanded[0] == '/'
686 && !(dkim_private_key_expanded =
687 expand_file_big_buffer(dkim_private_key_expanded)))
690 if (!(dkim_hash_expanded = expand_string(dkim->dkim_hash)))
691 { errwhen = US"dkim_hash"; goto expand_bad; }
693 if (dkim->dkim_identity)
694 if (!(dkim_identity_expanded = expand_string(dkim->dkim_identity)))
695 { errwhen = US"dkim_identity"; goto expand_bad; }
696 else if (!*dkim_identity_expanded)
697 dkim_identity_expanded = NULL;
699 if (dkim->dkim_timestamps)
700 if (!(dkim_timestamps_expanded = expand_string(dkim->dkim_timestamps)))
701 { errwhen = US"dkim_timestamps"; goto expand_bad; }
703 xval = (tval = (unsigned long) time(NULL))
704 + strtoul(CCS dkim_timestamps_expanded, NULL, 10);
706 if (!(sig = pdkim_init_sign(&dkim_sign_ctx, dkim_signing_domain,
707 dkim_signing_selector,
708 dkim_private_key_expanded,
713 dkim_private_key_expanded[0] = '\0';
715 pdkim_set_optional(sig,
716 CS dkim_sign_headers_expanded,
717 CS dkim_identity_expanded,
719 pdkim_canon, -1, tval, xval);
721 if (!pdkim_set_sig_bodyhash(&dkim_sign_ctx, sig))
724 if (!dkim_sign_ctx.sig) /* link sig to context chain */
725 dkim_sign_ctx.sig = sig;
728 pdkim_signature * n = dkim_sign_ctx.sig;
729 while (n->next) n = n->next;
735 /* We may need to carry on with the data-feed even if there are no DKIM sigs to
736 produce, if some other package (eg. ARC) is signing. */
738 if (!dkim_sign_ctx.sig && !dkim->force_bodyhash)
740 DEBUG(D_transport) debug_printf("DKIM: no viable signatures to use\n");
741 sigbuf = string_get(1); /* return a zero-len string */
745 if (prefix && (pdkim_rc = pdkim_feed(&dkim_sign_ctx, prefix, Ustrlen(prefix))) != PDKIM_OK)
748 if (lseek(fd, off, SEEK_SET) < 0)
751 while ((sread = read(fd, &buf, sizeof(buf))) > 0)
752 if ((pdkim_rc = pdkim_feed(&dkim_sign_ctx, buf, sread)) != PDKIM_OK)
755 /* Handle failed read above. */
758 debug_printf("DKIM: Error reading -K file.\n");
763 /* Build string of headers, one per signature */
765 if ((pdkim_rc = pdkim_feed_finish(&dkim_sign_ctx, &sig, errstr)) != PDKIM_OK)
770 DEBUG(D_transport) debug_printf("DKIM: no signatures to use\n");
771 sigbuf = string_get(1); /* return a zero-len string */
773 else for (sigbuf = NULL; sig; sig = sig->next)
774 sigbuf = string_append(sigbuf, 2, US sig->signature_header, US"\r\n");
778 (void) string_from_gstring(sigbuf);
779 store_pool = old_pool;
784 log_write(0, LOG_MAIN|LOG_PANIC,
785 "DKIM: signing failed: %.100s", pdkim_errstr(pdkim_rc));
791 log_write(0, LOG_MAIN | LOG_PANIC, "failed to expand %s: %s",
792 errwhen, expand_string_message);
800 authres_dkim(gstring * g)
802 pdkim_signature * sig;
803 int start = 0; /* compiler quietening */
805 DEBUG(D_acl) start = g->ptr;
807 for (sig = dkim_signatures; sig; sig = sig->next)
809 g = string_catn(g, US";\n\tdkim=", 8);
811 if (sig->verify_status & PDKIM_VERIFY_POLICY)
812 g = string_append(g, 5,
813 US"policy (", dkim_verify_status, US" - ", dkim_verify_reason, US")");
814 else switch(sig->verify_status)
816 case PDKIM_VERIFY_NONE: g = string_cat(g, US"none"); break;
817 case PDKIM_VERIFY_INVALID:
818 switch (sig->verify_ext_status)
820 case PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE:
821 g = string_cat(g, US"tmperror (pubkey unavailable)\n\t\t"); break;
822 case PDKIM_VERIFY_INVALID_BUFFER_SIZE:
823 g = string_cat(g, US"permerror (overlong public key record)\n\t\t"); break;
824 case PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD:
825 case PDKIM_VERIFY_INVALID_PUBKEY_IMPORT:
826 g = string_cat(g, US"neutral (public key record import problem)\n\t\t");
828 case PDKIM_VERIFY_INVALID_SIGNATURE_ERROR:
829 g = string_cat(g, US"neutral (signature tag missing or invalid)\n\t\t");
831 case PDKIM_VERIFY_INVALID_DKIM_VERSION:
832 g = string_cat(g, US"neutral (unsupported DKIM version)\n\t\t");
835 g = string_cat(g, US"permerror (unspecified problem)\n\t\t"); break;
838 case PDKIM_VERIFY_FAIL:
839 switch (sig->verify_ext_status)
841 case PDKIM_VERIFY_FAIL_BODY:
843 US"fail (body hash mismatch; body probably modified in transit)\n\t\t");
845 case PDKIM_VERIFY_FAIL_MESSAGE:
847 US"fail (signature did not verify; headers probably modified in transit)\n\t\t");
850 g = string_cat(g, US"fail (unspecified reason)\n\t\t");
854 case PDKIM_VERIFY_PASS: g = string_cat(g, US"pass"); break;
855 default: g = string_cat(g, US"permerror"); break;
857 if (sig->domain) g = string_append(g, 2, US" header.d=", sig->domain);
858 if (sig->identity) g = string_append(g, 2, US" header.i=", sig->identity);
859 if (sig->selector) g = string_append(g, 2, US" header.s=", sig->selector);
860 g = string_append(g, 2, US" header.a=", dkim_sig_to_a_tag(sig));
865 debug_printf("DKIM: no authres\n");
867 debug_printf("DKIM: authres '%.*s'\n", g->ptr - start - 3, g->s + start + 3);
872 # endif /*!MACRO_PREDEF*/
873 #endif /*!DISABLE_DKIM*/