2 * PDKIM - a RFC4871 (DKIM) implementation
4 * Copyright (C) 2009 Tom Kistner <tom@duncanthrax.net>
6 * http://duncanthrax.net/pdkim/
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
35 #define PDKIM_SIGNATURE_VERSION "1"
36 #define PDKIM_PUB_RECORD_VERSION "DKIM1"
38 #define PDKIM_MAX_HEADER_LEN 65536
39 #define PDKIM_MAX_HEADERS 512
40 #define PDKIM_MAX_BODY_LINE_LEN 16384
41 #define PDKIM_DNS_TXT_MAX_NAMELEN 1024
42 #define PDKIM_DEFAULT_SIGN_HEADERS "From:Sender:Reply-To:Subject:Date:"\
43 "Message-ID:To:Cc:MIME-Version:Content-Type:"\
44 "Content-Transfer-Encoding:Content-ID:"\
45 "Content-Description:Resent-Date:Resent-From:"\
46 "Resent-Sender:Resent-To:Resent-Cc:"\
47 "Resent-Message-ID:In-Reply-To:References:"\
48 "List-Id:List-Help:List-Unsubscribe:"\
49 "List-Subscribe:List-Post:List-Owner:List-Archive"
51 /* -------------------------------------------------------------------------- */
52 struct pdkim_stringlist
{
58 #define PDKIM_STR_ALLOC_FRAG 256
62 unsigned int allocated
;
65 /* -------------------------------------------------------------------------- */
66 /* A bunch of list constants */
67 const char *pdkim_querymethods
[] = {
71 const char *pdkim_algos
[] = {
76 const char *pdkim_canons
[] = {
81 const char *pdkim_hashes
[] = {
86 const char *pdkim_keytypes
[] = {
91 typedef struct pdkim_combined_canon_entry
{
95 } pdkim_combined_canon_entry
;
96 pdkim_combined_canon_entry pdkim_combined_canons
[] = {
97 { "simple/simple", PDKIM_CANON_SIMPLE
, PDKIM_CANON_SIMPLE
},
98 { "simple/relaxed", PDKIM_CANON_SIMPLE
, PDKIM_CANON_RELAXED
},
99 { "relaxed/simple", PDKIM_CANON_RELAXED
, PDKIM_CANON_SIMPLE
},
100 { "relaxed/relaxed", PDKIM_CANON_RELAXED
, PDKIM_CANON_RELAXED
},
101 { "simple", PDKIM_CANON_SIMPLE
, PDKIM_CANON_SIMPLE
},
102 { "relaxed", PDKIM_CANON_RELAXED
, PDKIM_CANON_SIMPLE
},
107 const char *pdkim_verify_status_str(int status
) {
109 case PDKIM_VERIFY_NONE
: return "PDKIM_VERIFY_NONE";
110 case PDKIM_VERIFY_INVALID
: return "PDKIM_VERIFY_INVALID";
111 case PDKIM_VERIFY_FAIL
: return "PDKIM_VERIFY_FAIL";
112 case PDKIM_VERIFY_PASS
: return "PDKIM_VERIFY_PASS";
113 default: return "PDKIM_VERIFY_UNKNOWN";
116 const char *pdkim_verify_ext_status_str(int ext_status
) {
118 case PDKIM_VERIFY_FAIL_BODY
: return "PDKIM_VERIFY_FAIL_BODY";
119 case PDKIM_VERIFY_FAIL_MESSAGE
: return "PDKIM_VERIFY_FAIL_MESSAGE";
120 case PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE
: return "PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE";
121 case PDKIM_VERIFY_INVALID_BUFFER_SIZE
: return "PDKIM_VERIFY_INVALID_BUFFER_SIZE";
122 case PDKIM_VERIFY_INVALID_PUBKEY_PARSING
: return "PDKIM_VERIFY_INVALID_PUBKEY_PARSING";
123 default: return "PDKIM_VERIFY_UNKNOWN";
128 /* -------------------------------------------------------------------------- */
129 /* Print debugging functions */
131 void pdkim_quoteprint(FILE *stream
, const char *data
, int len
, int lf
) {
133 const unsigned char *p
= (const unsigned char *)data
;
135 for (i
=0;i
<len
;i
++) {
138 case ' ' : fprintf(stream
,"{SP}"); break;
139 case '\t': fprintf(stream
,"{TB}"); break;
140 case '\r': fprintf(stream
,"{CR}"); break;
141 case '\n': fprintf(stream
,"{LF}"); break;
142 case '{' : fprintf(stream
,"{BO}"); break;
143 case '}' : fprintf(stream
,"{BC}"); break;
145 if ( (c
< 32) || (c
> 127) )
146 fprintf(stream
,"{%02x}",c
);
155 void pdkim_hexprint(FILE *stream
, const char *data
, int len
, int lf
) {
157 const unsigned char *p
= (const unsigned char *)data
;
159 for (i
=0;i
<len
;i
++) {
161 fprintf(stream
,"%02x",c
);
169 /* -------------------------------------------------------------------------- */
170 /* Simple string list implementation for convinience */
171 pdkim_stringlist
*pdkim_append_stringlist(pdkim_stringlist
*base
, char *str
) {
172 pdkim_stringlist
*new_entry
= malloc(sizeof(pdkim_stringlist
));
173 if (new_entry
== NULL
) return NULL
;
174 memset(new_entry
,0,sizeof(pdkim_stringlist
));
175 new_entry
->value
= strdup(str
);
176 if (new_entry
->value
== NULL
) return NULL
;
178 pdkim_stringlist
*last
= base
;
179 while (last
->next
!= NULL
) { last
= last
->next
; }
180 last
->next
= new_entry
;
183 else return new_entry
;
185 pdkim_stringlist
*pdkim_prepend_stringlist(pdkim_stringlist
*base
, char *str
) {
186 pdkim_stringlist
*new_entry
= malloc(sizeof(pdkim_stringlist
));
187 if (new_entry
== NULL
) return NULL
;
188 memset(new_entry
,0,sizeof(pdkim_stringlist
));
189 new_entry
->value
= strdup(str
);
190 if (new_entry
->value
== NULL
) return NULL
;
192 new_entry
->next
= base
;
198 /* -------------------------------------------------------------------------- */
199 /* A small "growing string" implementation to escape malloc/realloc hell */
200 pdkim_str
*pdkim_strnew (const char *cstr
) {
201 unsigned int len
= cstr
?strlen(cstr
):0;
202 pdkim_str
*p
= malloc(sizeof(pdkim_str
));
203 if (p
== NULL
) return NULL
;
204 memset(p
,0,sizeof(pdkim_str
));
205 p
->str
= malloc(len
+1);
206 if (p
->str
== NULL
) {
210 p
->allocated
=(len
+1);
212 if (cstr
) strcpy(p
->str
,cstr
);
213 else p
->str
[p
->len
] = '\0';
216 char *pdkim_strncat(pdkim_str
*str
, const char *data
, int len
) {
217 if ((str
->allocated
- str
->len
) < (len
+1)) {
218 /* Extend the buffer */
219 int num_frags
= ((len
+1)/PDKIM_STR_ALLOC_FRAG
)+1;
220 char *n
= realloc(str
->str
,
221 (str
->allocated
+(num_frags
*PDKIM_STR_ALLOC_FRAG
)));
222 if (n
== NULL
) return NULL
;
224 str
->allocated
+= (num_frags
*PDKIM_STR_ALLOC_FRAG
);
226 strncpy(&(str
->str
[str
->len
]),data
,len
);
228 str
->str
[str
->len
] = '\0';
231 char *pdkim_strcat(pdkim_str
*str
, const char *cstr
) {
232 return pdkim_strncat(str
, cstr
, strlen(cstr
));
234 char *pdkim_numcat(pdkim_str
*str
, unsigned long num
) {
236 snprintf(minibuf
,20,"%lu",num
);
237 return pdkim_strcat(str
,minibuf
);
239 char *pdkim_strtrim(pdkim_str
*str
) {
242 while ( (*p
!= '\0') && ((*p
== '\t') || (*p
== ' ')) ) p
++;
243 while (*p
!= '\0') {*q
= *p
; q
++; p
++;}
245 while ( (q
!= str
->str
) && ( (*q
== '\0') || (*q
== '\t') || (*q
== ' ') ) ) {
249 str
->len
= strlen(str
->str
);
252 char *pdkim_strclear(pdkim_str
*str
) {
257 void pdkim_strfree(pdkim_str
*str
) {
258 if (str
== NULL
) return;
259 if (str
->str
!= NULL
) free(str
->str
);
265 /* -------------------------------------------------------------------------- */
266 void pdkim_free_pubkey(pdkim_pubkey
*pub
) {
268 if (pub
->version
!= NULL
) free(pub
->version
);
269 if (pub
->granularity
!= NULL
) free(pub
->granularity
);
270 if (pub
->hashes
!= NULL
) free(pub
->hashes
);
271 if (pub
->keytype
!= NULL
) free(pub
->keytype
);
272 if (pub
->srvtype
!= NULL
) free(pub
->srvtype
);
273 if (pub
->notes
!= NULL
) free(pub
->notes
);
274 if (pub
->key
!= NULL
) free(pub
->key
);
280 /* -------------------------------------------------------------------------- */
281 void pdkim_free_sig(pdkim_signature
*sig
) {
283 pdkim_signature
*next
= (pdkim_signature
*)sig
->next
;
285 pdkim_stringlist
*e
= sig
->headers
;
287 pdkim_stringlist
*c
= e
;
288 if (e
->value
!= NULL
) free(e
->value
);
293 if (sig
->sigdata
!= NULL
) free(sig
->sigdata
);
294 if (sig
->bodyhash
!= NULL
) free(sig
->bodyhash
);
295 if (sig
->selector
!= NULL
) free(sig
->selector
);
296 if (sig
->domain
!= NULL
) free(sig
->domain
);
297 if (sig
->identity
!= NULL
) free(sig
->identity
);
298 if (sig
->headernames
!= NULL
) free(sig
->headernames
);
299 if (sig
->copiedheaders
!= NULL
) free(sig
->copiedheaders
);
300 if (sig
->rsa_privkey
!= NULL
) free(sig
->rsa_privkey
);
301 if (sig
->sign_headers
!= NULL
) free(sig
->sign_headers
);
302 if (sig
->signature_header
!= NULL
) free(sig
->signature_header
);
303 if (sig
->sha1_body
!= NULL
) free(sig
->sha1_body
);
304 if (sig
->sha2_body
!= NULL
) free(sig
->sha2_body
);
306 if (sig
->pubkey
!= NULL
) pdkim_free_pubkey(sig
->pubkey
);
309 if (next
!= NULL
) pdkim_free_sig(next
);
314 /* -------------------------------------------------------------------------- */
315 DLLEXPORT
void pdkim_free_ctx(pdkim_ctx
*ctx
) {
317 pdkim_stringlist
*e
= ctx
->headers
;
319 pdkim_stringlist
*c
= e
;
320 if (e
->value
!= NULL
) free(e
->value
);
324 pdkim_free_sig(ctx
->sig
);
325 pdkim_strfree(ctx
->cur_header
);
331 /* -------------------------------------------------------------------------- */
332 /* Matches the name of the passed raw "header" against
333 the passed colon-separated "list", starting at entry
334 "start". Returns the position of the header name in
336 int header_name_match(const char *header
,
345 /* Get header name */
346 char *hcolon
= strchr(header
,':');
347 if (hcolon
== NULL
) return rc
; /* This isn't a header */
348 hname
= malloc((hcolon
-header
)+1);
349 if (hname
== NULL
) return PDKIM_ERR_OOM
;
350 memset(hname
,0,(hcolon
-header
)+1);
351 strncpy(hname
,header
,(hcolon
-header
));
353 /* Copy tick-off list locally, so we can punch zeroes into it */
354 lcopy
= strdup(tick
);
357 return PDKIM_ERR_OOM
;
364 if (strcasecmp(p
,hname
) == 0) {
366 /* Invalidate header name instance in tick-off list */
367 if (do_tick
) tick
[p
-lcopy
] = '_';
375 if (strcasecmp(p
,hname
) == 0) {
377 /* Invalidate header name instance in tick-off list */
378 if (do_tick
) tick
[p
-lcopy
] = '_';
388 /* -------------------------------------------------------------------------- */
389 /* Performs "relaxed" canonicalization of a header. The returned pointer needs
391 char *pdkim_relax_header (char *header
, int crlf
) {
392 int past_field_name
= 0;
396 char *relaxed
= malloc(strlen(header
)+3);
397 if (relaxed
== NULL
) return NULL
;
402 if ( (c
== '\r') || (c
== '\n') ) {
406 if ( (c
== '\t') || (c
== ' ') ) {
407 c
= ' '; /* Turns WSP into SP */
415 if ( (!past_field_name
) && (c
== ':') ) {
416 if (seen_wsp
) q
--; /* This removes WSP before the colon */
417 seen_wsp
= 1; /* This removes WSP after the colon */
422 /* Lowercase header name */
423 if (!past_field_name
) c
= tolower(c
);
428 if ((q
>relaxed
) && (*(q
-1) == ' ')) q
--; /* Squash eventual trailing SP */
430 if (crlf
) strcat(relaxed
,"\r\n");
435 /* -------------------------------------------------------------------------- */
436 #define PDKIM_QP_ERROR_DECODE -1
437 char *pdkim_decode_qp_char(char *qp_p
, int *c
) {
438 char *initial_pos
= qp_p
;
440 /* Advance one char */
443 /* Check for two hex digits and decode them */
444 if (isxdigit(*qp_p
) && isxdigit(qp_p
[1])) {
445 /* Do hex conversion */
446 if (isdigit(*qp_p
)) {*c
= *qp_p
- '0';}
447 else {*c
= toupper(*qp_p
) - 'A' + 10;}
449 if (isdigit(qp_p
[1])) {*c
|= qp_p
[1] - '0';}
450 else {*c
|= toupper(qp_p
[1]) - 'A' + 10;}
454 /* Illegal char here */
455 *c
= PDKIM_QP_ERROR_DECODE
;
460 /* -------------------------------------------------------------------------- */
461 char *pdkim_decode_qp(char *str
) {
465 char *n
= malloc(strlen(p
)+1);
466 if (n
== NULL
) return NULL
;
471 p
= pdkim_decode_qp_char(p
,&nchar
);
489 /* -------------------------------------------------------------------------- */
490 char *pdkim_decode_base64(char *str
, int *num_decoded
) {
494 base64_decode(NULL
, &dlen
, (unsigned char *)str
, strlen(str
));
495 res
= malloc(dlen
+1);
496 if (res
== NULL
) return NULL
;
497 if (base64_decode((unsigned char *)res
,&dlen
,(unsigned char *)str
,strlen(str
)) != 0) {
501 if (num_decoded
!= NULL
) *num_decoded
= dlen
;
505 /* -------------------------------------------------------------------------- */
506 char *pdkim_encode_base64(char *str
, int num
) {
510 base64_encode(NULL
, &dlen
, (unsigned char *)str
, num
);
511 res
= malloc(dlen
+1);
512 if (res
== NULL
) return NULL
;
513 if (base64_encode((unsigned char *)res
,&dlen
,(unsigned char *)str
,num
) != 0) {
521 /* -------------------------------------------------------------------------- */
522 #define PDKIM_HDR_LIMBO 0
523 #define PDKIM_HDR_TAG 1
524 #define PDKIM_HDR_VALUE 2
525 pdkim_signature
*pdkim_parse_sig_header(pdkim_ctx
*ctx
, char *raw_hdr
) {
526 pdkim_signature
*sig
;
528 pdkim_str
*cur_tag
= NULL
;
529 pdkim_str
*cur_val
= NULL
;
532 int where
= PDKIM_HDR_LIMBO
;
535 sig
= malloc(sizeof(pdkim_signature
));
536 if (sig
== NULL
) return NULL
;
537 memset(sig
,0,sizeof(pdkim_signature
));
538 sig
->bodylength
= -1;
540 sig
->rawsig_no_b_val
= malloc(strlen(raw_hdr
)+1);
541 if (sig
->rawsig_no_b_val
== NULL
) {
547 q
= sig
->rawsig_no_b_val
;
552 if ( (*p
== '\r') || (*p
== '\n') )
555 /* Fast-forward through header name */
557 if (*p
== ':') past_hname
= 1;
561 if (where
== PDKIM_HDR_LIMBO
) {
562 /* In limbo, just wait for a tag-char to appear */
563 if (!((*p
>= 'a') && (*p
<= 'z')))
566 where
= PDKIM_HDR_TAG
;
569 if (where
== PDKIM_HDR_TAG
) {
571 cur_tag
= pdkim_strnew(NULL
);
573 if ((*p
>= 'a') && (*p
<= 'z'))
574 pdkim_strncat(cur_tag
,p
,1);
577 if (strcmp(cur_tag
->str
,"b") == 0) {
581 where
= PDKIM_HDR_VALUE
;
586 if (where
== PDKIM_HDR_VALUE
) {
588 cur_val
= pdkim_strnew(NULL
);
590 if ( (*p
== '\r') || (*p
== '\n') || (*p
== ' ') || (*p
== '\t') )
593 if ( (*p
== ';') || (*p
== '\0') ) {
594 if (cur_tag
->len
> 0) {
595 pdkim_strtrim(cur_val
);
597 if (ctx
->debug_stream
)
598 fprintf(ctx
->debug_stream
, "%s=%s\n", cur_tag
->str
, cur_val
->str
);
600 switch (cur_tag
->str
[0]) {
602 switch (cur_tag
->str
[1]) {
604 sig
->bodyhash
= pdkim_decode_base64(cur_val
->str
,&(sig
->bodyhash_len
));
607 sig
->sigdata
= pdkim_decode_base64(cur_val
->str
,&(sig
->sigdata_len
));
612 if (strcmp(cur_val
->str
,PDKIM_SIGNATURE_VERSION
) == 0) {
613 /* We only support version 1, and that is currently the
614 only version there is. */
620 while (pdkim_algos
[i
] != NULL
) {
621 if (strcmp(cur_val
->str
,pdkim_algos
[i
]) == 0 ) {
630 while (pdkim_combined_canons
[i
].str
!= NULL
) {
631 if (strcmp(cur_val
->str
,pdkim_combined_canons
[i
].str
) == 0 ) {
632 sig
->canon_headers
= pdkim_combined_canons
[i
].canon_headers
;
633 sig
->canon_body
= pdkim_combined_canons
[i
].canon_body
;
641 while (pdkim_querymethods
[i
] != NULL
) {
642 if (strcmp(cur_val
->str
,pdkim_querymethods
[i
]) == 0 ) {
643 sig
->querymethod
= i
;
650 sig
->selector
= strdup(cur_val
->str
);
653 sig
->domain
= strdup(cur_val
->str
);
656 sig
->identity
= pdkim_decode_qp(cur_val
->str
);
659 sig
->created
= strtoul(cur_val
->str
,NULL
,10);
662 sig
->expires
= strtoul(cur_val
->str
,NULL
,10);
665 sig
->bodylength
= strtol(cur_val
->str
,NULL
,10);
668 sig
->headernames
= strdup(cur_val
->str
);
671 sig
->copiedheaders
= pdkim_decode_qp(cur_val
->str
);
675 if (ctx
->debug_stream
)
676 fprintf(ctx
->debug_stream
, "Unknown tag encountered\n");
681 pdkim_strclear(cur_tag
);
682 pdkim_strclear(cur_val
);
684 where
= PDKIM_HDR_LIMBO
;
687 else pdkim_strncat(cur_val
,p
,1);
691 if (*p
== '\0') break;
700 /* Make sure the most important bits are there. */
701 if (!(sig
->domain
&& (*(sig
->domain
) != '\0') &&
702 sig
->selector
&& (*(sig
->selector
) != '\0') &&
703 sig
->headernames
&& (*(sig
->headernames
) != '\0') &&
712 /* Chomp raw header. The final newline must not be added to the signature. */
714 while( (q
> sig
->rawsig_no_b_val
) && ((*q
== '\r') || (*q
== '\n')) ) {
719 if (ctx
->debug_stream
) {
720 fprintf(ctx
->debug_stream
,
721 "PDKIM >> Raw signature w/o b= tag value >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
722 pdkim_quoteprint(ctx
->debug_stream
,
723 sig
->rawsig_no_b_val
,
724 strlen(sig
->rawsig_no_b_val
), 1);
725 fprintf(ctx
->debug_stream
,
726 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
730 sig
->sha1_body
= malloc(sizeof(sha1_context
));
731 if (sig
->sha1_body
== NULL
) {
735 sig
->sha2_body
= malloc(sizeof(sha2_context
));
736 if (sig
->sha2_body
== NULL
) {
741 sha1_starts(sig
->sha1_body
);
742 sha2_starts(sig
->sha2_body
,0);
748 /* -------------------------------------------------------------------------- */
749 pdkim_pubkey
*pdkim_parse_pubkey_record(pdkim_ctx
*ctx
, char *raw_record
) {
752 pdkim_str
*cur_tag
= NULL
;
753 pdkim_str
*cur_val
= NULL
;
754 int where
= PDKIM_HDR_LIMBO
;
756 pub
= malloc(sizeof(pdkim_pubkey
));
757 if (pub
== NULL
) return NULL
;
758 memset(pub
,0,sizeof(pdkim_pubkey
));
765 if ( (*p
== '\r') || (*p
== '\n') )
768 if (where
== PDKIM_HDR_LIMBO
) {
769 /* In limbo, just wait for a tag-char to appear */
770 if (!((*p
>= 'a') && (*p
<= 'z')))
773 where
= PDKIM_HDR_TAG
;
776 if (where
== PDKIM_HDR_TAG
) {
778 cur_tag
= pdkim_strnew(NULL
);
780 if ((*p
>= 'a') && (*p
<= 'z'))
781 pdkim_strncat(cur_tag
,p
,1);
784 where
= PDKIM_HDR_VALUE
;
789 if (where
== PDKIM_HDR_VALUE
) {
791 cur_val
= pdkim_strnew(NULL
);
793 if ( (*p
== '\r') || (*p
== '\n') )
796 if ( (*p
== ';') || (*p
== '\0') ) {
797 if (cur_tag
->len
> 0) {
798 pdkim_strtrim(cur_val
);
800 if (ctx
->debug_stream
)
801 fprintf(ctx
->debug_stream
, "%s=%s\n", cur_tag
->str
, cur_val
->str
);
803 switch (cur_tag
->str
[0]) {
805 /* This tag isn't evaluated because:
806 - We only support version DKIM1.
807 - Which is the default for this value (set below)
808 - Other versions are currently not specified. */
811 pub
->hashes
= strdup(cur_val
->str
);
814 pub
->granularity
= strdup(cur_val
->str
);
817 pub
->notes
= pdkim_decode_qp(cur_val
->str
);
820 pub
->key
= pdkim_decode_base64(cur_val
->str
,&(pub
->key_len
));
823 pub
->hashes
= strdup(cur_val
->str
);
826 pub
->srvtype
= strdup(cur_val
->str
);
829 if (strchr(cur_val
->str
,'y') != NULL
) pub
->testing
= 1;
830 if (strchr(cur_val
->str
,'s') != NULL
) pub
->no_subdomaining
= 1;
834 if (ctx
->debug_stream
)
835 fprintf(ctx
->debug_stream
, "Unknown tag encountered\n");
840 pdkim_strclear(cur_tag
);
841 pdkim_strclear(cur_val
);
842 where
= PDKIM_HDR_LIMBO
;
845 else pdkim_strncat(cur_val
,p
,1);
849 if (*p
== '\0') break;
853 /* Set fallback defaults */
854 if (pub
->version
== NULL
) pub
->version
= strdup(PDKIM_PUB_RECORD_VERSION
);
855 if (pub
->granularity
== NULL
) pub
->granularity
= strdup("*");
856 if (pub
->keytype
== NULL
) pub
->keytype
= strdup("rsa");
857 if (pub
->srvtype
== NULL
) pub
->srvtype
= strdup("*");
860 if (pub
->key
== NULL
) {
861 pdkim_free_pubkey(pub
);
869 /* -------------------------------------------------------------------------- */
870 int pdkim_update_bodyhash(pdkim_ctx
*ctx
, const char *data
, int len
) {
871 pdkim_signature
*sig
= ctx
->sig
;
872 /* Cache relaxed version of data */
873 char *relaxed_data
= NULL
;
876 /* Traverse all signatures, updating their hashes. */
877 while (sig
!= NULL
) {
878 /* Defaults to simple canon (no further treatment necessary) */
879 const char *canon_data
= data
;
882 if (sig
->canon_body
== PDKIM_CANON_RELAXED
) {
883 /* Relax the line if not done already */
884 if (relaxed_data
== NULL
) {
886 const char *p
= data
;
888 relaxed_data
= malloc(len
+1);
889 if (relaxed_data
== NULL
) return PDKIM_ERR_OOM
;
893 if ( (q
> 0) && (relaxed_data
[q
-1] == ' ') ) q
--;
895 else if ( (c
== '\t') || (c
== ' ') ) {
896 c
= ' '; /* Turns WSP into SP */
904 relaxed_data
[q
++] = c
;
907 relaxed_data
[q
] = '\0';
910 canon_data
= relaxed_data
;
911 canon_len
= relaxed_len
;
914 /* Make sure we don't exceed the to-be-signed body length */
915 if ((sig
->bodylength
>= 0) &&
916 ((sig
->signed_body_bytes
+(unsigned long)canon_len
) > sig
->bodylength
))
917 canon_len
= (sig
->bodylength
- sig
->signed_body_bytes
);
920 if (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)
921 sha1_update(sig
->sha1_body
,(unsigned char *)canon_data
,canon_len
);
923 sha2_update(sig
->sha2_body
,(unsigned char *)canon_data
,canon_len
);
924 sig
->signed_body_bytes
+= canon_len
;
926 if (ctx
->debug_stream
!=NULL
)
927 pdkim_quoteprint(ctx
->debug_stream
,canon_data
,canon_len
,0);
934 if (relaxed_data
!= NULL
) free(relaxed_data
);
939 /* -------------------------------------------------------------------------- */
940 int pdkim_finish_bodyhash(pdkim_ctx
*ctx
) {
941 pdkim_signature
*sig
= ctx
->sig
;
943 /* Traverse all signatures */
944 while (sig
!= NULL
) {
947 unsigned char bh
[32]; /* SHA-256 = 32 Bytes, SHA-1 = 20 Bytes */
948 if (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)
949 sha1_finish(sig
->sha1_body
,bh
);
951 sha2_finish(sig
->sha2_body
,bh
);
954 if (ctx
->debug_stream
) {
955 fprintf(ctx
->debug_stream
, "PDKIM [%s] Body bytes hashed: %lu\n",
956 sig
->domain
, sig
->signed_body_bytes
);
957 fprintf(ctx
->debug_stream
, "PDKIM [%s] bh computed: ", sig
->domain
);
958 pdkim_hexprint(ctx
->debug_stream
, (char *)bh
,
959 (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)?20:32,1);
963 /* SIGNING -------------------------------------------------------------- */
964 if (ctx
->mode
== PDKIM_MODE_SIGN
) {
965 sig
->bodyhash_len
= (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)?20:32;
966 sig
->bodyhash
= malloc(sig
->bodyhash_len
);
967 if (sig
->bodyhash
== NULL
) return PDKIM_ERR_OOM
;
968 memcpy(sig
->bodyhash
,bh
,sig
->bodyhash_len
);
970 /* If bodylength limit is set, and we have received less bytes
971 than the requested amount, effectively remove the limit tag. */
972 if (sig
->signed_body_bytes
< sig
->bodylength
) sig
->bodylength
= -1;
974 /* VERIFICATION --------------------------------------------------------- */
976 /* Compare bodyhash */
977 if (memcmp(bh
,sig
->bodyhash
,
978 (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)?20:32) == 0) {
980 if (ctx
->debug_stream
)
981 fprintf(ctx
->debug_stream
, "PDKIM [%s] Body hash verified OK\n",
987 if (ctx
->debug_stream
) {
988 fprintf(ctx
->debug_stream
, "PDKIM [%s] Body hash did NOT verify\n",
990 fprintf(ctx
->debug_stream
, "PDKIM [%s] bh signature: ", sig
->domain
);
991 pdkim_hexprint(ctx
->debug_stream
, sig
->bodyhash
,
992 (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)?20:32,1);
995 sig
->verify_status
= PDKIM_VERIFY_FAIL
;
996 sig
->verify_ext_status
= PDKIM_VERIFY_FAIL_BODY
;
1008 /* -------------------------------------------------------------------------- */
1009 /* Callback from pdkim_feed below for processing complete body lines */
1010 int pdkim_bodyline_complete(pdkim_ctx
*ctx
) {
1011 char *p
= ctx
->linebuf
;
1012 int n
= ctx
->linebuf_offset
;
1014 /* Ignore extra data if we've seen the end-of-data marker */
1015 if (ctx
->seen_eod
) goto BAIL
;
1017 /* We've always got one extra byte to stuff a zero ... */
1018 ctx
->linebuf
[(ctx
->linebuf_offset
)] = '\0';
1020 if (ctx
->input_mode
== PDKIM_INPUT_SMTP
) {
1021 /* Terminate on EOD marker */
1022 if (memcmp(p
,".\r\n",3) == 0) {
1027 if (memcmp(p
,"..",2) == 0) {
1033 /* Empty lines need to be buffered until we find a non-empty line */
1034 if (memcmp(p
,"\r\n",2) == 0) {
1035 ctx
->num_buffered_crlf
++;
1039 /* At this point, we have a non-empty line, so release the buffered ones. */
1040 while (ctx
->num_buffered_crlf
) {
1041 pdkim_update_bodyhash(ctx
,"\r\n",2);
1042 ctx
->num_buffered_crlf
--;
1045 pdkim_update_bodyhash(ctx
,p
,n
);
1048 ctx
->linebuf_offset
= 0;
1053 /* -------------------------------------------------------------------------- */
1054 /* Callback from pdkim_feed below for processing complete headers */
1055 #define DKIM_SIGNATURE_HEADERNAME "DKIM-Signature:"
1056 int pdkim_header_complete(pdkim_ctx
*ctx
) {
1057 pdkim_signature
*sig
= ctx
->sig
;
1059 /* Special case: The last header can have an extra \r appended */
1060 if ( (ctx
->cur_header
->len
> 1) &&
1061 (ctx
->cur_header
->str
[(ctx
->cur_header
->len
)-1] == '\r') ) {
1062 ctx
->cur_header
->str
[(ctx
->cur_header
->len
)-1] = '\0';
1063 ctx
->cur_header
->len
--;
1067 if (ctx
->num_headers
> PDKIM_MAX_HEADERS
) goto BAIL
;
1069 /* SIGNING -------------------------------------------------------------- */
1070 if (ctx
->mode
== PDKIM_MODE_SIGN
) {
1071 /* Traverse all signatures */
1072 while (sig
!= NULL
) {
1073 pdkim_stringlist
*list
;
1075 if (header_name_match(ctx
->cur_header
->str
,
1078 PDKIM_DEFAULT_SIGN_HEADERS
, 0) != PDKIM_OK
) goto NEXT_SIG
;
1080 /* Add header to the signed headers list (in reverse order) */
1081 list
= pdkim_prepend_stringlist(sig
->headers
,
1082 ctx
->cur_header
->str
);
1083 if (list
== NULL
) return PDKIM_ERR_OOM
;
1084 sig
->headers
= list
;
1091 /* DKIM-Signature: headers are added to the verification list */
1092 if (ctx
->mode
== PDKIM_MODE_VERIFY
) {
1093 if (strncasecmp(ctx
->cur_header
->str
,
1094 DKIM_SIGNATURE_HEADERNAME
,
1095 strlen(DKIM_SIGNATURE_HEADERNAME
)) == 0) {
1096 pdkim_signature
*new_sig
;
1097 /* Create and chain new signature block */
1099 if (ctx
->debug_stream
)
1100 fprintf(ctx
->debug_stream
,
1101 "PDKIM >> Found sig, trying to parse >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1103 new_sig
= pdkim_parse_sig_header(ctx
, ctx
->cur_header
->str
);
1104 if (new_sig
!= NULL
) {
1105 pdkim_signature
*last_sig
= ctx
->sig
;
1106 if (last_sig
== NULL
) {
1110 while (last_sig
->next
!= NULL
) { last_sig
= last_sig
->next
; }
1111 last_sig
->next
= new_sig
;
1116 if (ctx
->debug_stream
) {
1117 fprintf(ctx
->debug_stream
,"Error while parsing signature header\n");
1118 fprintf(ctx
->debug_stream
,
1119 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1124 /* every other header is stored for signature verification */
1126 pdkim_stringlist
*list
;
1128 list
= pdkim_prepend_stringlist(ctx
->headers
,
1129 ctx
->cur_header
->str
);
1130 if (list
== NULL
) return PDKIM_ERR_OOM
;
1131 ctx
->headers
= list
;
1136 pdkim_strclear(ctx
->cur_header
); /* Re-use existing pdkim_str */
1142 /* -------------------------------------------------------------------------- */
1143 #define HEADER_BUFFER_FRAG_SIZE 256
1144 DLLEXPORT
int pdkim_feed (pdkim_ctx
*ctx
,
1148 for (p
=0;p
<len
;p
++) {
1150 if (ctx
->past_headers
) {
1151 /* Processing body byte */
1152 ctx
->linebuf
[(ctx
->linebuf_offset
)++] = c
;
1154 int rc
= pdkim_bodyline_complete(ctx
); /* End of line */
1155 if (rc
!= PDKIM_OK
) return rc
;
1157 if (ctx
->linebuf_offset
== (PDKIM_MAX_BODY_LINE_LEN
-1))
1158 return PDKIM_ERR_LONG_LINE
;
1161 /* Processing header byte */
1165 int rc
= pdkim_header_complete(ctx
); /* Seen last header line */
1166 if (rc
!= PDKIM_OK
) return rc
;
1167 ctx
->past_headers
= 1;
1170 if (ctx
->debug_stream
)
1171 fprintf(ctx
->debug_stream
,
1172 "PDKIM >> Hashed body data, canonicalized >>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1176 else ctx
->seen_lf
= 1;
1178 else if (ctx
->seen_lf
) {
1179 if (! ((c
== '\t') || (c
== ' '))) {
1180 int rc
= pdkim_header_complete(ctx
); /* End of header */
1181 if (rc
!= PDKIM_OK
) return rc
;
1186 if (ctx
->cur_header
== NULL
) {
1187 ctx
->cur_header
= pdkim_strnew(NULL
);
1188 if (ctx
->cur_header
== NULL
) return PDKIM_ERR_OOM
;
1190 if (ctx
->cur_header
->len
< PDKIM_MAX_HEADER_LEN
)
1191 if (pdkim_strncat(ctx
->cur_header
,&data
[p
],1) == NULL
)
1192 return PDKIM_ERR_OOM
;
1199 /* -------------------------------------------------------------------------- */
1200 char *pdkim_create_header(pdkim_signature
*sig
, int final
) {
1202 char *base64_bh
= NULL
;
1203 char *base64_b
= NULL
;
1204 pdkim_str
*hdr
= pdkim_strnew("DKIM-Signature: v="PDKIM_SIGNATURE_VERSION
);
1205 if (hdr
== NULL
) return NULL
;
1207 base64_bh
= pdkim_encode_base64(sig
->bodyhash
, sig
->bodyhash_len
);
1208 if (base64_bh
== NULL
) goto BAIL
;
1210 /* Required and static bits */
1212 pdkim_strcat(hdr
,"; a=") &&
1213 pdkim_strcat(hdr
,pdkim_algos
[sig
->algo
]) &&
1214 pdkim_strcat(hdr
,"; q=") &&
1215 pdkim_strcat(hdr
,pdkim_querymethods
[sig
->querymethod
]) &&
1216 pdkim_strcat(hdr
,"; c=") &&
1217 pdkim_strcat(hdr
,pdkim_canons
[sig
->canon_headers
]) &&
1218 pdkim_strcat(hdr
,"/") &&
1219 pdkim_strcat(hdr
,pdkim_canons
[sig
->canon_body
]) &&
1220 pdkim_strcat(hdr
,"; d=") &&
1221 pdkim_strcat(hdr
,sig
->domain
) &&
1222 pdkim_strcat(hdr
,"; s=") &&
1223 pdkim_strcat(hdr
,sig
->selector
) &&
1224 pdkim_strcat(hdr
,";\r\n\th=") &&
1225 pdkim_strcat(hdr
,sig
->headernames
) &&
1226 pdkim_strcat(hdr
,"; bh=") &&
1227 pdkim_strcat(hdr
,base64_bh
) &&
1228 pdkim_strcat(hdr
,";\r\n\t")
1231 if (sig
->identity
!= NULL
) {
1232 if (!( pdkim_strcat(hdr
,"i=") &&
1233 pdkim_strcat(hdr
,sig
->identity
) &&
1234 pdkim_strcat(hdr
,";") ) ) {
1238 if (sig
->created
> 0) {
1239 if (!( pdkim_strcat(hdr
,"t=") &&
1240 pdkim_numcat(hdr
,sig
->created
) &&
1241 pdkim_strcat(hdr
,";") ) ) {
1245 if (sig
->expires
> 0) {
1246 if (!( pdkim_strcat(hdr
,"x=") &&
1247 pdkim_numcat(hdr
,sig
->expires
) &&
1248 pdkim_strcat(hdr
,";") ) ) {
1252 if (sig
->bodylength
>= 0) {
1253 if (!( pdkim_strcat(hdr
,"l=") &&
1254 pdkim_numcat(hdr
,sig
->bodylength
) &&
1255 pdkim_strcat(hdr
,";") ) ) {
1259 /* Extra linebreak */
1260 if (hdr
->str
[(hdr
->len
)-1] == ';') {
1261 if (!pdkim_strcat(hdr
," \r\n\t")) goto BAIL
;
1263 /* Preliminary or final version? */
1265 base64_b
= pdkim_encode_base64(sig
->sigdata
, sig
->sigdata_len
);
1266 if (base64_b
== NULL
) goto BAIL
;
1268 pdkim_strcat(hdr
,"b=") &&
1269 pdkim_strcat(hdr
,base64_b
) &&
1270 pdkim_strcat(hdr
,";")
1274 if (pdkim_strcat(hdr
,"b=;")) goto DONE
;
1281 rc
= strdup(hdr
->str
);
1285 if (base64_bh
!= NULL
) free(base64_bh
);
1286 if (base64_b
!= NULL
) free(base64_b
);
1291 /* -------------------------------------------------------------------------- */
1292 DLLEXPORT
int pdkim_feed_finish(pdkim_ctx
*ctx
, pdkim_signature
**return_signatures
) {
1293 pdkim_signature
*sig
= ctx
->sig
;
1294 pdkim_str
*headernames
= NULL
; /* Collected signed header names */
1296 /* Check if we must still flush a (partial) header. If that is the
1297 case, the message has no body, and we must compute a body hash
1298 out of '<CR><LF>' */
1299 if (ctx
->cur_header
&& ctx
->cur_header
->len
) {
1300 int rc
= pdkim_header_complete(ctx
);
1301 if (rc
!= PDKIM_OK
) return rc
;
1302 pdkim_update_bodyhash(ctx
,"\r\n",2);
1305 /* For non-smtp input, check if there's an unfinished line in the
1306 body line buffer. If that is the case, we must add a CRLF to the
1307 hash to properly terminate the message. */
1308 if ((ctx
->input_mode
== PDKIM_INPUT_NORMAL
) && ctx
->linebuf_offset
) {
1309 pdkim_update_bodyhash(ctx
, ctx
->linebuf
, ctx
->linebuf_offset
);
1310 pdkim_update_bodyhash(ctx
,"\r\n",2);
1313 if (ctx
->debug_stream
)
1314 fprintf(ctx
->debug_stream
,
1315 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1319 /* Build (and/or evaluate) body hash */
1320 if (pdkim_finish_bodyhash(ctx
) != PDKIM_OK
) return PDKIM_ERR_OOM
;
1322 /* SIGNING -------------------------------------------------------------- */
1323 if (ctx
->mode
== PDKIM_MODE_SIGN
) {
1324 headernames
= pdkim_strnew(NULL
);
1325 if (headernames
== NULL
) return PDKIM_ERR_OOM
;
1327 /* ---------------------------------------------------------------------- */
1329 while (sig
!= NULL
) {
1330 sha1_context sha1_headers
;
1331 sha2_context sha2_headers
;
1333 char headerhash
[32];
1335 if (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)
1336 sha1_starts(&sha1_headers
);
1338 sha2_starts(&sha2_headers
,0);
1341 if (ctx
->debug_stream
)
1342 fprintf(ctx
->debug_stream
,
1343 "PDKIM >> Hashed header data, canonicalized, in sequence >>>>>>>>>>>>>>\n");
1346 /* SIGNING ---------------------------------------------------------------- */
1347 /* When signing, walk through our header list and add them to the hash. As we
1348 go, construct a list of the header's names to use for the h= parameter. */
1349 if (ctx
->mode
== PDKIM_MODE_SIGN
) {
1350 pdkim_stringlist
*p
= sig
->headers
;
1353 /* Collect header names (Note: colon presence is guaranteed here) */
1354 char *q
= strchr(p
->value
,':');
1355 if (pdkim_strncat(headernames
, p
->value
,
1356 (q
-(p
->value
))+((p
->next
==NULL
)?0:1)) == NULL
)
1357 return PDKIM_ERR_OOM
;
1359 if (sig
->canon_headers
== PDKIM_CANON_RELAXED
)
1360 rh
= pdkim_relax_header(p
->value
,1); /* cook header for relaxed canon */
1362 rh
= strdup(p
->value
); /* just copy it for simple canon */
1364 if (rh
== NULL
) return PDKIM_ERR_OOM
;
1366 /* Feed header to the hash algorithm */
1367 if (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)
1368 sha1_update(&(sha1_headers
),(unsigned char *)rh
,strlen(rh
));
1370 sha2_update(&(sha2_headers
),(unsigned char *)rh
,strlen(rh
));
1372 if (ctx
->debug_stream
)
1373 pdkim_quoteprint(ctx
->debug_stream
, rh
, strlen(rh
), 1);
1379 /* VERIFICATION ----------------------------------------------------------- */
1380 /* When verifying, walk through the header name list in the h= parameter and
1381 add the headers to the hash in that order. */
1383 char *b
= strdup(sig
->headernames
);
1386 if (b
== NULL
) return PDKIM_ERR_OOM
;
1389 pdkim_stringlist
*hdrs
= ctx
->headers
;
1390 while (hdrs
!= NULL
) {
1396 hdrs
= ctx
->headers
;
1398 if (q
!= NULL
) *q
= '\0';
1399 while (hdrs
!= NULL
) {
1400 if ( (hdrs
->tag
== 0) &&
1401 (strncasecmp(hdrs
->value
,p
,strlen(p
)) == 0) &&
1402 ((hdrs
->value
)[strlen(p
)] == ':') ) {
1404 if (sig
->canon_headers
== PDKIM_CANON_RELAXED
)
1405 rh
= pdkim_relax_header(hdrs
->value
,1); /* cook header for relaxed canon */
1407 rh
= strdup(hdrs
->value
); /* just copy it for simple canon */
1408 if (rh
== NULL
) return PDKIM_ERR_OOM
;
1409 /* Feed header to the hash algorithm */
1410 if (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)
1411 sha1_update(&(sha1_headers
),(unsigned char *)rh
,strlen(rh
));
1413 sha2_update(&(sha2_headers
),(unsigned char *)rh
,strlen(rh
));
1415 if (ctx
->debug_stream
)
1416 pdkim_quoteprint(ctx
->debug_stream
, rh
, strlen(rh
), 1);
1424 if (q
== NULL
) break;
1431 if (ctx
->debug_stream
)
1432 fprintf(ctx
->debug_stream
,
1433 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1436 /* SIGNING ---------------------------------------------------------------- */
1437 if (ctx
->mode
== PDKIM_MODE_SIGN
) {
1438 /* Copy headernames to signature struct */
1439 sig
->headernames
= strdup(headernames
->str
);
1440 pdkim_strfree(headernames
);
1442 /* Create signature header with b= omitted */
1443 sig_hdr
= pdkim_create_header(ctx
->sig
,0);
1445 /* VERIFICATION ----------------------------------------------------------- */
1447 sig_hdr
= strdup(sig
->rawsig_no_b_val
);
1449 /* ------------------------------------------------------------------------ */
1451 if (sig_hdr
== NULL
) return PDKIM_ERR_OOM
;
1453 /* Relax header if necessary */
1454 if (sig
->canon_headers
== PDKIM_CANON_RELAXED
) {
1455 char *relaxed_hdr
= pdkim_relax_header(sig_hdr
,0);
1457 if (relaxed_hdr
== NULL
) return PDKIM_ERR_OOM
;
1458 sig_hdr
= relaxed_hdr
;
1462 if (ctx
->debug_stream
) {
1463 fprintf(ctx
->debug_stream
,
1464 "PDKIM >> Signed DKIM-Signature header, canonicalized >>>>>>>>>>>>>>>>>\n");
1465 pdkim_quoteprint(ctx
->debug_stream
, sig_hdr
, strlen(sig_hdr
), 1);
1466 fprintf(ctx
->debug_stream
,
1467 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1471 /* Finalize header hash */
1472 if (sig
->algo
== PDKIM_ALGO_RSA_SHA1
) {
1473 sha1_update(&(sha1_headers
),(unsigned char *)sig_hdr
,strlen(sig_hdr
));
1474 sha1_finish(&(sha1_headers
),(unsigned char *)headerhash
);
1476 if (ctx
->debug_stream
) {
1477 fprintf(ctx
->debug_stream
, "PDKIM [%s] hh computed: ", sig
->domain
);
1478 pdkim_hexprint(ctx
->debug_stream
, headerhash
, 20, 1);
1483 sha2_update(&(sha2_headers
),(unsigned char *)sig_hdr
,strlen(sig_hdr
));
1484 sha2_finish(&(sha2_headers
),(unsigned char *)headerhash
);
1486 if (ctx
->debug_stream
) {
1487 fprintf(ctx
->debug_stream
, "PDKIM [%s] hh computed: ", sig
->domain
);
1488 pdkim_hexprint(ctx
->debug_stream
, headerhash
, 32, 1);
1495 /* SIGNING ---------------------------------------------------------------- */
1496 if (ctx
->mode
== PDKIM_MODE_SIGN
) {
1499 rsa_init(&rsa
,RSA_PKCS_V15
,0);
1501 /* Perform private key operation */
1502 if (rsa_parse_key(&rsa
, (unsigned char *)sig
->rsa_privkey
,
1503 strlen(sig
->rsa_privkey
), NULL
, 0) != 0) {
1504 return PDKIM_ERR_RSA_PRIVKEY
;
1507 sig
->sigdata_len
= mpi_size(&(rsa
.N
));
1508 sig
->sigdata
= malloc(sig
->sigdata_len
);
1509 if (sig
->sigdata
== NULL
) return PDKIM_ERR_OOM
;
1511 if (rsa_pkcs1_sign( &rsa
, RSA_PRIVATE
,
1512 ((sig
->algo
== PDKIM_ALGO_RSA_SHA1
)?
1513 SIG_RSA_SHA1
:SIG_RSA_SHA256
),
1515 (unsigned char *)headerhash
,
1516 (unsigned char *)sig
->sigdata
) != 0) {
1517 return PDKIM_ERR_RSA_SIGNING
;
1523 if (ctx
->debug_stream
) {
1524 fprintf(ctx
->debug_stream
, "PDKIM [%s] b computed: ",
1526 pdkim_hexprint(ctx
->debug_stream
, sig
->sigdata
, sig
->sigdata_len
, 1);
1530 sig
->signature_header
= pdkim_create_header(ctx
->sig
,1);
1531 if (sig
->signature_header
== NULL
) return PDKIM_ERR_OOM
;
1533 /* VERIFICATION ----------------------------------------------------------- */
1536 char *dns_txt_name
, *dns_txt_reply
;
1538 rsa_init(&rsa
,RSA_PKCS_V15
,0);
1540 dns_txt_name
= malloc(PDKIM_DNS_TXT_MAX_NAMELEN
);
1541 if (dns_txt_name
== NULL
) return PDKIM_ERR_OOM
;
1542 dns_txt_reply
= malloc(PDKIM_DNS_TXT_MAX_RECLEN
);
1543 if (dns_txt_reply
== NULL
) {
1545 return PDKIM_ERR_OOM
;
1547 memset(dns_txt_reply
,0,PDKIM_DNS_TXT_MAX_RECLEN
);
1548 memset(dns_txt_name
,0,PDKIM_DNS_TXT_MAX_NAMELEN
);
1550 if (snprintf(dns_txt_name
,PDKIM_DNS_TXT_MAX_NAMELEN
,
1551 "%s._domainkey.%s.",
1552 sig
->selector
,sig
->domain
) >= PDKIM_DNS_TXT_MAX_NAMELEN
) {
1553 sig
->verify_status
= PDKIM_VERIFY_INVALID
;
1554 sig
->verify_ext_status
= PDKIM_VERIFY_INVALID_BUFFER_SIZE
;
1558 if ((ctx
->dns_txt_callback(dns_txt_name
, dns_txt_reply
) != PDKIM_OK
) ||
1559 (dns_txt_reply
[0] == '\0')) {
1560 sig
->verify_status
= PDKIM_VERIFY_INVALID
;
1561 sig
->verify_ext_status
= PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE
;
1566 if (ctx
->debug_stream
) {
1567 fprintf(ctx
->debug_stream
,
1568 "PDKIM >> Parsing public key record >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1569 fprintf(ctx
->debug_stream
,"Raw record: ");
1570 pdkim_quoteprint(ctx
->debug_stream
, dns_txt_reply
, strlen(dns_txt_reply
), 1);
1574 sig
->pubkey
= pdkim_parse_pubkey_record(ctx
,dns_txt_reply
);
1575 if (sig
->pubkey
== NULL
) {
1576 sig
->verify_status
= PDKIM_VERIFY_INVALID
;
1577 sig
->verify_ext_status
= PDKIM_VERIFY_INVALID_PUBKEY_PARSING
;
1579 if (ctx
->debug_stream
) {
1580 fprintf(ctx
->debug_stream
,"Error while parsing public key record\n");
1581 fprintf(ctx
->debug_stream
,
1582 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1589 if (ctx
->debug_stream
) {
1590 fprintf(ctx
->debug_stream
,
1591 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1595 if (rsa_parse_public_key(&rsa
,
1596 (unsigned char *)sig
->pubkey
->key
,
1597 sig
->pubkey
->key_len
) != 0) {
1598 sig
->verify_status
= PDKIM_VERIFY_INVALID
;
1599 sig
->verify_ext_status
= PDKIM_VERIFY_INVALID_PUBKEY_PARSING
;
1603 /* Check the signature */
1604 if (rsa_pkcs1_verify(&rsa
,
1606 ((sig
->algo
== PDKIM_ALGO_RSA_SHA1
)?
1607 SIG_RSA_SHA1
:SIG_RSA_SHA256
),
1609 (unsigned char *)headerhash
,
1610 (unsigned char *)sig
->sigdata
) != 0) {
1611 sig
->verify_status
= PDKIM_VERIFY_FAIL
;
1612 sig
->verify_ext_status
= PDKIM_VERIFY_FAIL_MESSAGE
;
1616 /* We have a winner! (if bodydhash was correct earlier) */
1617 if (sig
->verify_status
== PDKIM_VERIFY_NONE
) {
1618 sig
->verify_status
= PDKIM_VERIFY_PASS
;
1624 if (ctx
->debug_stream
) {
1625 fprintf(ctx
->debug_stream
, "PDKIM [%s] signature status: %s",
1626 sig
->domain
, pdkim_verify_status_str(sig
->verify_status
));
1627 if (sig
->verify_ext_status
> 0) {
1628 fprintf(ctx
->debug_stream
, " (%s)\n",
1629 pdkim_verify_ext_status_str(sig
->verify_ext_status
));
1632 fprintf(ctx
->debug_stream
, "\n");
1639 free(dns_txt_reply
);
1645 /* If requested, set return pointer to signature(s) */
1646 if (return_signatures
!= NULL
) {
1647 *return_signatures
= ctx
->sig
;
1654 /* -------------------------------------------------------------------------- */
1655 DLLEXPORT pdkim_ctx
*pdkim_init_verify(int input_mode
,
1656 int(*dns_txt_callback
)(char *, char *)
1658 pdkim_ctx
*ctx
= malloc(sizeof(pdkim_ctx
));
1659 if (ctx
== NULL
) return NULL
;
1660 memset(ctx
,0,sizeof(pdkim_ctx
));
1662 ctx
->linebuf
= malloc(PDKIM_MAX_BODY_LINE_LEN
);
1663 if (ctx
->linebuf
== NULL
) {
1668 ctx
->mode
= PDKIM_MODE_VERIFY
;
1669 ctx
->input_mode
= input_mode
;
1670 ctx
->dns_txt_callback
= dns_txt_callback
;
1676 /* -------------------------------------------------------------------------- */
1677 DLLEXPORT pdkim_ctx
*pdkim_init_sign(int input_mode
,
1680 char *rsa_privkey
) {
1682 pdkim_signature
*sig
;
1684 if (!domain
|| !selector
|| !rsa_privkey
) return NULL
;
1686 ctx
= malloc(sizeof(pdkim_ctx
));
1687 if (ctx
== NULL
) return NULL
;
1688 memset(ctx
,0,sizeof(pdkim_ctx
));
1690 ctx
->linebuf
= malloc(PDKIM_MAX_BODY_LINE_LEN
);
1691 if (ctx
->linebuf
== NULL
) {
1696 sig
= malloc(sizeof(pdkim_signature
));
1702 memset(sig
,0,sizeof(pdkim_signature
));
1703 sig
->bodylength
= -1;
1705 ctx
->mode
= PDKIM_MODE_SIGN
;
1706 ctx
->input_mode
= input_mode
;
1709 ctx
->sig
->domain
= strdup(domain
);
1710 ctx
->sig
->selector
= strdup(selector
);
1711 ctx
->sig
->rsa_privkey
= strdup(rsa_privkey
);
1713 if (!ctx
->sig
->domain
|| !ctx
->sig
->selector
|| !ctx
->sig
->rsa_privkey
) {
1714 pdkim_free_ctx(ctx
);
1718 ctx
->sig
->sha1_body
= malloc(sizeof(sha1_context
));
1719 if (ctx
->sig
->sha1_body
== NULL
) {
1720 pdkim_free_ctx(ctx
);
1723 sha1_starts(ctx
->sig
->sha1_body
);
1725 ctx
->sig
->sha2_body
= malloc(sizeof(sha2_context
));
1726 if (ctx
->sig
->sha2_body
== NULL
) {
1727 pdkim_free_ctx(ctx
);
1730 sha2_starts(ctx
->sig
->sha2_body
,0);
1736 /* -------------------------------------------------------------------------- */
1737 DLLEXPORT
void pdkim_set_debug_stream(pdkim_ctx
*ctx
,
1738 FILE *debug_stream
) {
1739 ctx
->debug_stream
= debug_stream
;
1743 /* -------------------------------------------------------------------------- */
1744 DLLEXPORT
int pdkim_set_optional(pdkim_ctx
*ctx
,
1751 unsigned long created
,
1752 unsigned long expires
) {
1754 if (identity
!= NULL
) {
1755 ctx
->sig
->identity
= strdup(identity
);
1756 if (ctx
->sig
->identity
== NULL
) return PDKIM_ERR_OOM
;
1759 if (sign_headers
!= NULL
) {
1760 ctx
->sig
->sign_headers
= strdup(sign_headers
);
1761 if (ctx
->sig
->sign_headers
== NULL
) return PDKIM_ERR_OOM
;
1764 ctx
->sig
->canon_headers
= canon_headers
;
1765 ctx
->sig
->canon_body
= canon_body
;
1766 ctx
->sig
->bodylength
= bodylength
;
1767 ctx
->sig
->algo
= algo
;
1768 ctx
->sig
->created
= created
;
1769 ctx
->sig
->expires
= expires
;