2 * PDKIM - a RFC4871 (DKIM) implementation
4 * Copyright (C) 2009 - 2016 Tom Kistner <tom@duncanthrax.net>
5 * Copyright (C) 2016 Jeremy Harris <jgh@exim.org>
7 * http://duncanthrax.net/pdkim/
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #ifndef DISABLE_DKIM /* entire file */
30 # error Need SUPPORT_TLS for DKIM
33 #include "crypt_ver.h"
36 # include <openssl/rsa.h>
37 # include <openssl/ssl.h>
38 # include <openssl/err.h>
39 #elif defined(RSA_GNUTLS)
40 # include <gnutls/gnutls.h>
41 # include <gnutls/x509.h>
42 # include <gnutls/abstract.h>
46 # include <gnutls/crypto.h>
47 #elif defined(SHA_POLARSSL)
48 # include "polarssl/sha1.h"
49 # include "polarssl/sha2.h"
54 #define PDKIM_SIGNATURE_VERSION "1"
55 #define PDKIM_PUB_RECORD_VERSION "DKIM1"
57 #define PDKIM_MAX_HEADER_LEN 65536
58 #define PDKIM_MAX_HEADERS 512
59 #define PDKIM_MAX_BODY_LINE_LEN 16384
60 #define PDKIM_DNS_TXT_MAX_NAMELEN 1024
61 #define PDKIM_DEFAULT_SIGN_HEADERS "From:Sender:Reply-To:Subject:Date:"\
62 "Message-ID:To:Cc:MIME-Version:Content-Type:"\
63 "Content-Transfer-Encoding:Content-ID:"\
64 "Content-Description:Resent-Date:Resent-From:"\
65 "Resent-Sender:Resent-To:Resent-Cc:"\
66 "Resent-Message-ID:In-Reply-To:References:"\
67 "List-Id:List-Help:List-Unsubscribe:"\
68 "List-Subscribe:List-Post:List-Owner:List-Archive"
70 /* -------------------------------------------------------------------------- */
71 struct pdkim_stringlist
{
77 #define PDKIM_STR_ALLOC_FRAG 256
81 unsigned int allocated
;
84 /* -------------------------------------------------------------------------- */
85 /* A bunch of list constants */
86 const char *pdkim_querymethods
[] = {
90 const char *pdkim_algos
[] = {
95 const char *pdkim_canons
[] = {
100 const char *pdkim_hashes
[] = {
105 const char *pdkim_keytypes
[] = {
110 typedef struct pdkim_combined_canon_entry
{
114 } pdkim_combined_canon_entry
;
116 pdkim_combined_canon_entry pdkim_combined_canons
[] = {
117 { "simple/simple", PDKIM_CANON_SIMPLE
, PDKIM_CANON_SIMPLE
},
118 { "simple/relaxed", PDKIM_CANON_SIMPLE
, PDKIM_CANON_RELAXED
},
119 { "relaxed/simple", PDKIM_CANON_RELAXED
, PDKIM_CANON_SIMPLE
},
120 { "relaxed/relaxed", PDKIM_CANON_RELAXED
, PDKIM_CANON_RELAXED
},
121 { "simple", PDKIM_CANON_SIMPLE
, PDKIM_CANON_SIMPLE
},
122 { "relaxed", PDKIM_CANON_RELAXED
, PDKIM_CANON_SIMPLE
},
127 /* -------------------------------------------------------------------------- */
130 pdkim_verify_status_str(int status
)
133 case PDKIM_VERIFY_NONE
: return "PDKIM_VERIFY_NONE";
134 case PDKIM_VERIFY_INVALID
: return "PDKIM_VERIFY_INVALID";
135 case PDKIM_VERIFY_FAIL
: return "PDKIM_VERIFY_FAIL";
136 case PDKIM_VERIFY_PASS
: return "PDKIM_VERIFY_PASS";
137 default: return "PDKIM_VERIFY_UNKNOWN";
142 pdkim_verify_ext_status_str(int ext_status
)
145 case PDKIM_VERIFY_FAIL_BODY
: return "PDKIM_VERIFY_FAIL_BODY";
146 case PDKIM_VERIFY_FAIL_MESSAGE
: return "PDKIM_VERIFY_FAIL_MESSAGE";
147 case PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE
: return "PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE";
148 case PDKIM_VERIFY_INVALID_BUFFER_SIZE
: return "PDKIM_VERIFY_INVALID_BUFFER_SIZE";
149 case PDKIM_VERIFY_INVALID_PUBKEY_PARSING
: return "PDKIM_VERIFY_INVALID_PUBKEY_PARSING";
150 default: return "PDKIM_VERIFY_UNKNOWN";
155 /* -------------------------------------------------------------------------- */
156 /* Print debugging functions */
158 pdkim_quoteprint(const char *data
, int len
, int lf
)
161 const unsigned char *p
= (const unsigned char *)data
;
163 for (i
= 0; i
< len
; i
++)
168 case ' ' : debug_printf("{SP}"); break;
169 case '\t': debug_printf("{TB}"); break;
170 case '\r': debug_printf("{CR}"); break;
171 case '\n': debug_printf("{LF}"); break;
172 case '{' : debug_printf("{BO}"); break;
173 case '}' : debug_printf("{BC}"); break;
175 if ( (c
< 32) || (c
> 127) )
176 debug_printf("{%02x}", c
);
178 debug_printf("%c", c
);
187 pdkim_hexprint(const char *data
, int len
, int lf
)
190 const unsigned char *p
= (const unsigned char *)data
;
192 for (i
= 0 ; i
< len
; i
++)
193 debug_printf("%02x", p
[i
]);
200 /* String package: should be replaced by Exim standard ones */
202 static pdkim_stringlist
*
203 pdkim_prepend_stringlist(pdkim_stringlist
*base
, char *str
)
205 pdkim_stringlist
*new_entry
= malloc(sizeof(pdkim_stringlist
));
207 if (!new_entry
) return NULL
;
208 memset(new_entry
, 0, sizeof(pdkim_stringlist
));
209 if (!(new_entry
->value
= strdup(str
))) return NULL
;
212 pdkim_stringlist
*last
= base
;
213 while (last
->next
!= NULL
) { last
= last
->next
; }
214 last
->next
= new_entry
;
222 /* -------------------------------------------------------------------------- */
223 /* A small "growing string" implementation to escape malloc/realloc hell */
226 pdkim_strnew (const char *cstr
)
228 unsigned int len
= cstr
? strlen(cstr
) : 0;
229 pdkim_str
*p
= malloc(sizeof(pdkim_str
));
232 memset(p
, 0, sizeof(pdkim_str
));
233 if (!(p
->str
= malloc(len
+1)))
238 p
->allocated
= len
+1;
241 strcpy(p
->str
, cstr
);
243 p
->str
[p
->len
] = '\0';
248 pdkim_strncat(pdkim_str
*str
, const char *data
, int len
)
250 if ((str
->allocated
- str
->len
) < (len
+1))
252 /* Extend the buffer */
253 int num_frags
= ((len
+1)/PDKIM_STR_ALLOC_FRAG
)+1;
254 char *n
= realloc(str
->str
,
255 (str
->allocated
+(num_frags
*PDKIM_STR_ALLOC_FRAG
)));
256 if (n
== NULL
) return NULL
;
258 str
->allocated
+= (num_frags
*PDKIM_STR_ALLOC_FRAG
);
260 strncpy(&(str
->str
[str
->len
]), data
, len
);
262 str
->str
[str
->len
] = '\0';
267 pdkim_strcat(pdkim_str
*str
, const char *cstr
)
269 return pdkim_strncat(str
, cstr
, strlen(cstr
));
273 pdkim_strtrim(pdkim_str
*str
)
277 while ( (*p
!= '\0') && ((*p
== '\t') || (*p
== ' ')) ) p
++;
278 while (*p
!= '\0') {*q
= *p
; q
++; p
++;}
280 while ( (q
!= str
->str
) && ( (*q
== '\0') || (*q
== '\t') || (*q
== ' ') ) )
285 str
->len
= strlen(str
->str
);
290 pdkim_strclear(pdkim_str
*str
)
298 pdkim_strfree(pdkim_str
*str
)
301 if (str
->str
) free(str
->str
);
307 /* -------------------------------------------------------------------------- */
310 pdkim_free_pubkey(pdkim_pubkey
*pub
)
314 if (pub
->version
) free(pub
->version
);
315 if (pub
->granularity
) free(pub
->granularity
);
316 if (pub
->hashes
) free(pub
->hashes
);
317 if (pub
->keytype
) free(pub
->keytype
);
318 if (pub
->srvtype
) free(pub
->srvtype
);
319 if (pub
->notes
) free(pub
->notes
);
320 /* if (pub->key ) free(pub->key); */
326 /* -------------------------------------------------------------------------- */
329 pdkim_free_sig(pdkim_signature
*sig
)
333 pdkim_signature
*next
= (pdkim_signature
*)sig
->next
;
335 pdkim_stringlist
*e
= sig
->headers
;
338 pdkim_stringlist
*c
= e
;
339 if (e
->value
) free(e
->value
);
344 if (sig
->selector
) free(sig
->selector
);
345 if (sig
->domain
) free(sig
->domain
);
346 if (sig
->identity
) free(sig
->identity
);
347 if (sig
->headernames
) free(sig
->headernames
);
348 if (sig
->copiedheaders
) free(sig
->copiedheaders
);
349 if (sig
->rsa_privkey
) free(sig
->rsa_privkey
);
350 if (sig
->sign_headers
) free(sig
->sign_headers
);
351 if (sig
->signature_header
) free(sig
->signature_header
);
353 if (sig
->pubkey
) pdkim_free_pubkey(sig
->pubkey
);
356 if (next
) pdkim_free_sig(next
);
361 /* -------------------------------------------------------------------------- */
364 pdkim_free_ctx(pdkim_ctx
*ctx
)
368 pdkim_stringlist
*e
= ctx
->headers
;
371 pdkim_stringlist
*c
= e
;
372 if (e
->value
) free(e
->value
);
376 pdkim_free_sig(ctx
->sig
);
377 pdkim_strfree(ctx
->cur_header
);
383 /* -------------------------------------------------------------------------- */
384 /* Matches the name of the passed raw "header" against
385 the passed colon-separated "list", starting at entry
386 "start". Returns the position of the header name in
390 header_name_match(const char *header
,
400 /* Get header name */
401 char *hcolon
= strchr(header
, ':');
403 if (!hcolon
) return rc
; /* This isn't a header */
405 if (!(hname
= malloc((hcolon
-header
)+1)))
406 return PDKIM_ERR_OOM
;
407 memset(hname
, 0, (hcolon
-header
)+1);
408 strncpy(hname
, header
, (hcolon
-header
));
410 /* Copy tick-off list locally, so we can punch zeroes into it */
411 if (!(lcopy
= strdup(tick
)))
414 return PDKIM_ERR_OOM
;
422 if (strcasecmp(p
, hname
) == 0)
425 /* Invalidate header name instance in tick-off list */
426 if (do_tick
) tick
[p
-lcopy
] = '_';
434 if (strcasecmp(p
, hname
) == 0)
437 /* Invalidate header name instance in tick-off list */
438 if (do_tick
) tick
[p
-lcopy
] = '_';
448 /* -------------------------------------------------------------------------- */
449 /* Performs "relaxed" canonicalization of a header. The returned pointer needs
453 pdkim_relax_header (char *header
, int crlf
)
455 BOOL past_field_name
= FALSE
;
456 BOOL seen_wsp
= FALSE
;
459 char *relaxed
= malloc(strlen(header
)+3);
461 if (!relaxed
) return NULL
;
464 for (p
= header
; *p
!= '\0'; p
++)
468 if (c
== '\r' || c
== '\n')
470 if (c
== '\t' || c
== ' ')
474 c
= ' '; /* Turns WSP into SP */
478 if (!past_field_name
&& c
== ':')
480 if (seen_wsp
) q
--; /* This removes WSP before the colon */
481 seen_wsp
= TRUE
; /* This removes WSP after the colon */
482 past_field_name
= TRUE
;
487 /* Lowercase header name */
488 if (!past_field_name
) c
= tolower(c
);
492 if (q
> relaxed
&& q
[-1] == ' ') q
--; /* Squash eventual trailing SP */
495 if (crlf
) strcat(relaxed
, "\r\n");
500 /* -------------------------------------------------------------------------- */
501 #define PDKIM_QP_ERROR_DECODE -1
504 pdkim_decode_qp_char(char *qp_p
, int *c
)
506 char *initial_pos
= qp_p
;
508 /* Advance one char */
511 /* Check for two hex digits and decode them */
512 if (isxdigit(*qp_p
) && isxdigit(qp_p
[1]))
514 /* Do hex conversion */
515 *c
= (isdigit(*qp_p
) ? *qp_p
- '0' : toupper(*qp_p
) - 'A' + 10) << 4;
516 *c
|= isdigit(qp_p
[1]) ? qp_p
[1] - '0' : toupper(qp_p
[1]) - 'A' + 10;
520 /* Illegal char here */
521 *c
= PDKIM_QP_ERROR_DECODE
;
526 /* -------------------------------------------------------------------------- */
529 pdkim_decode_qp(char *str
)
534 char *n
= malloc(strlen(p
)+1);
544 p
= pdkim_decode_qp_char(p
, &nchar
);
560 /* -------------------------------------------------------------------------- */
563 pdkim_decode_base64(char *str
, int *num_decoded
)
567 int old_pool
= store_pool
;
569 /* There is a store-reset between header & body reception
570 so cannot use the main pool */
572 store_pool
= POOL_PERM
;
573 dlen
= b64decode(US str
, USS
&res
);
574 store_pool
= old_pool
;
576 if (dlen
< 0) return NULL
;
578 if (num_decoded
) *num_decoded
= dlen
;
583 /* -------------------------------------------------------------------------- */
586 pdkim_encode_base64(char *str
, int num
)
589 int old_pool
= store_pool
;
591 store_pool
= POOL_PERM
;
592 ret
= CS
b64encode(US str
, num
);
593 store_pool
= old_pool
;
598 /* -------------------------------------------------------------------------- */
599 #define PDKIM_HDR_LIMBO 0
600 #define PDKIM_HDR_TAG 1
601 #define PDKIM_HDR_VALUE 2
603 static pdkim_signature
*
604 pdkim_parse_sig_header(pdkim_ctx
*ctx
, char *raw_hdr
)
606 pdkim_signature
*sig
;
608 pdkim_str
*cur_tag
= NULL
;
609 pdkim_str
*cur_val
= NULL
;
610 BOOL past_hname
= FALSE
;
611 BOOL in_b_val
= FALSE
;
612 int where
= PDKIM_HDR_LIMBO
;
615 if (!(sig
= malloc(sizeof(pdkim_signature
)))) return NULL
;
616 memset(sig
, 0, sizeof(pdkim_signature
));
617 sig
->bodylength
= -1;
619 if (!(sig
->rawsig_no_b_val
= malloc(strlen(raw_hdr
)+1)))
625 q
= sig
->rawsig_no_b_val
;
627 for (p
= raw_hdr
; ; p
++)
632 if (c
== '\r' || c
== '\n')
635 /* Fast-forward through header name */
638 if (c
== ':') past_hname
= TRUE
;
642 if (where
== PDKIM_HDR_LIMBO
)
644 /* In limbo, just wait for a tag-char to appear */
645 if (!(c
>= 'a' && c
<= 'z'))
648 where
= PDKIM_HDR_TAG
;
651 if (where
== PDKIM_HDR_TAG
)
654 cur_tag
= pdkim_strnew(NULL
);
656 if (c
>= 'a' && c
<= 'z')
657 pdkim_strncat(cur_tag
, p
, 1);
661 if (strcmp(cur_tag
->str
, "b") == 0)
666 where
= PDKIM_HDR_VALUE
;
671 if (where
== PDKIM_HDR_VALUE
)
674 cur_val
= pdkim_strnew(NULL
);
676 if (c
== '\r' || c
== '\n' || c
== ' ' || c
== '\t')
679 if (c
== ';' || c
== '\0')
681 if (cur_tag
->len
> 0)
683 pdkim_strtrim(cur_val
);
685 DEBUG(D_acl
) debug_printf(" %s=%s\n", cur_tag
->str
, cur_val
->str
);
687 switch (cur_tag
->str
[0])
690 if (cur_tag
->str
[1] == 'h')
691 sig
->bodyhash
= pdkim_decode_base64(cur_val
->str
,
694 sig
->sigdata
= pdkim_decode_base64(cur_val
->str
,
698 /* We only support version 1, and that is currently the
699 only version there is. */
700 if (strcmp(cur_val
->str
, PDKIM_SIGNATURE_VERSION
) == 0)
704 for (i
= 0; pdkim_algos
[i
]; i
++)
705 if (strcmp(cur_val
->str
, pdkim_algos
[i
]) == 0)
712 for (i
= 0; pdkim_combined_canons
[i
].str
; i
++)
713 if (strcmp(cur_val
->str
, pdkim_combined_canons
[i
].str
) == 0)
715 sig
->canon_headers
= pdkim_combined_canons
[i
].canon_headers
;
716 sig
->canon_body
= pdkim_combined_canons
[i
].canon_body
;
721 for (i
= 0; pdkim_querymethods
[i
]; i
++)
722 if (strcmp(cur_val
->str
, pdkim_querymethods
[i
]) == 0)
724 sig
->querymethod
= i
;
729 sig
->selector
= strdup(cur_val
->str
); break;
731 sig
->domain
= strdup(cur_val
->str
); break;
733 sig
->identity
= pdkim_decode_qp(cur_val
->str
); break;
735 sig
->created
= strtoul(cur_val
->str
, NULL
, 10); break;
737 sig
->expires
= strtoul(cur_val
->str
, NULL
, 10); break;
739 sig
->bodylength
= strtol(cur_val
->str
, NULL
, 10); break;
741 sig
->headernames
= strdup(cur_val
->str
); break;
743 sig
->copiedheaders
= pdkim_decode_qp(cur_val
->str
); break;
745 DEBUG(D_acl
) debug_printf(" Unknown tag encountered\n");
749 pdkim_strclear(cur_tag
);
750 pdkim_strclear(cur_val
);
752 where
= PDKIM_HDR_LIMBO
;
755 pdkim_strncat(cur_val
, p
, 1);
766 /* Make sure the most important bits are there. */
767 if (!(sig
->domain
&& (*(sig
->domain
) != '\0') &&
768 sig
->selector
&& (*(sig
->selector
) != '\0') &&
769 sig
->headernames
&& (*(sig
->headernames
) != '\0') &&
779 /* Chomp raw header. The final newline must not be added to the signature. */
781 while (q
> sig
->rawsig_no_b_val
&& (*q
== '\r' || *q
== '\n'))
782 *q
= '\0'; q
--; /*XXX questionable code layout; possible bug */
787 "PDKIM >> Raw signature w/o b= tag value >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
788 pdkim_quoteprint(sig
->rawsig_no_b_val
, strlen(sig
->rawsig_no_b_val
), 1);
790 "PDKIM >> Sig size: %4d bits\n", sig
->sigdata_len
*8);
792 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
797 SHA1_Init (&sig
->sha1_body
);
798 SHA256_Init(&sig
->sha2_body
);
800 #elif defined(SHA_GNUTLS)
802 gnutls_hash_init(&sig
->sha_body
,
803 sig
->algo
== PDKIM_ALGO_RSA_SHA1
? GNUTLS_DIG_SHA1
: GNUTLS_DIG_SHA256
);
805 #elif defined(SHA_POLARSSL)
807 if ( !(sig
->sha1_body
= malloc(sizeof(sha1_context
)))
808 || !(sig
->sha2_body
= malloc(sizeof(sha2_context
)))
815 sha1_starts(sig
->sha1_body
);
816 sha2_starts(sig
->sha2_body
, 0);
818 #endif /* SHA impl */
824 /* -------------------------------------------------------------------------- */
826 static pdkim_pubkey
*
827 pdkim_parse_pubkey_record(pdkim_ctx
*ctx
, char *raw_record
)
831 pdkim_str
*cur_tag
= NULL
;
832 pdkim_str
*cur_val
= NULL
;
833 int where
= PDKIM_HDR_LIMBO
;
835 if (!(pub
= malloc(sizeof(pdkim_pubkey
)))) return NULL
;
836 memset(pub
, 0, sizeof(pdkim_pubkey
));
838 for (p
= raw_record
; ; p
++)
843 if (c
== '\r' || c
== '\n')
846 if (where
== PDKIM_HDR_LIMBO
)
848 /* In limbo, just wait for a tag-char to appear */
849 if (!(c
>= 'a' && c
<= 'z'))
852 where
= PDKIM_HDR_TAG
;
855 if (where
== PDKIM_HDR_TAG
)
858 cur_tag
= pdkim_strnew(NULL
);
860 if (c
>= 'a' && c
<= 'z')
861 pdkim_strncat(cur_tag
, p
, 1);
865 where
= PDKIM_HDR_VALUE
;
870 if (where
== PDKIM_HDR_VALUE
)
873 cur_val
= pdkim_strnew(NULL
);
875 if (c
== '\r' || c
== '\n')
878 if (c
== ';' || c
== '\0')
880 if (cur_tag
->len
> 0)
882 pdkim_strtrim(cur_val
);
883 DEBUG(D_acl
) debug_printf(" %s=%s\n", cur_tag
->str
, cur_val
->str
);
885 switch (cur_tag
->str
[0])
888 /* This tag isn't evaluated because:
889 - We only support version DKIM1.
890 - Which is the default for this value (set below)
891 - Other versions are currently not specified. */
894 pub
->hashes
= strdup(cur_val
->str
); break;
896 pub
->granularity
= strdup(cur_val
->str
); break;
898 pub
->notes
= pdkim_decode_qp(cur_val
->str
); break;
900 pub
->key
= pdkim_decode_base64(cur_val
->str
, &(pub
->key_len
)); break;
902 pub
->hashes
= strdup(cur_val
->str
); break;
904 pub
->srvtype
= strdup(cur_val
->str
); break;
906 if (strchr(cur_val
->str
, 'y') != NULL
) pub
->testing
= 1;
907 if (strchr(cur_val
->str
, 's') != NULL
) pub
->no_subdomaining
= 1;
910 DEBUG(D_acl
) debug_printf(" Unknown tag encountered\n");
914 pdkim_strclear(cur_tag
);
915 pdkim_strclear(cur_val
);
916 where
= PDKIM_HDR_LIMBO
;
919 pdkim_strncat(cur_val
, p
, 1);
923 if (c
== '\0') break;
926 /* Set fallback defaults */
927 if (!pub
->version
) pub
->version
= strdup(PDKIM_PUB_RECORD_VERSION
);
928 if (!pub
->granularity
) pub
->granularity
= strdup("*");
929 if (!pub
->keytype
) pub
->keytype
= strdup("rsa");
930 if (!pub
->srvtype
) pub
->srvtype
= strdup("*");
936 pdkim_free_pubkey(pub
);
941 /* -------------------------------------------------------------------------- */
944 pdkim_update_bodyhash(pdkim_ctx
*ctx
, const char *data
, int len
)
946 pdkim_signature
*sig
= ctx
->sig
;
947 /* Cache relaxed version of data */
948 char *relaxed_data
= NULL
;
951 /* Traverse all signatures, updating their hashes. */
954 /* Defaults to simple canon (no further treatment necessary) */
955 const char *canon_data
= data
;
958 if (sig
->canon_body
== PDKIM_CANON_RELAXED
)
960 /* Relax the line if not done already */
963 BOOL seen_wsp
= FALSE
;
967 if (!(relaxed_data
= malloc(len
+1)))
968 return PDKIM_ERR_OOM
;
970 for (p
= data
; *p
; p
++)
975 if (q
> 0 && relaxed_data
[q
-1] == ' ')
978 else if (c
== '\t' || c
== ' ')
980 c
= ' '; /* Turns WSP into SP */
987 relaxed_data
[q
++] = c
;
989 relaxed_data
[q
] = '\0';
992 canon_data
= relaxed_data
;
993 canon_len
= relaxed_len
;
996 /* Make sure we don't exceed the to-be-signed body length */
997 if ( sig
->bodylength
>= 0
998 && sig
->signed_body_bytes
+ (unsigned long)canon_len
> sig
->bodylength
1000 canon_len
= sig
->bodylength
- sig
->signed_body_bytes
;
1005 gnutls_hash(sig
->sha_body
, canon_data
, canon_len
);
1007 if (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)
1009 SHA1_Update (&sig
->sha1_body
, canon_data
, canon_len
);
1011 SHA256_Update(&sig
->sha2_body
, canon_data
, canon_len
);
1012 # elif defined(SHA_POLARSSL)
1013 sha1_update(sig
->sha1_body
, US canon_data
, canon_len
);
1015 sha2_update(sig
->sha2_body
, US canon_data
, canon_len
);
1019 sig
->signed_body_bytes
+= canon_len
;
1020 DEBUG(D_acl
) pdkim_quoteprint(canon_data
, canon_len
, 1);
1026 if (relaxed_data
) free(relaxed_data
);
1031 /* -------------------------------------------------------------------------- */
1034 pdkim_finish_bodyhash(pdkim_ctx
*ctx
)
1036 pdkim_signature
*sig
;
1038 /* Traverse all signatures */
1039 for (sig
= ctx
->sig
; sig
; sig
= sig
->next
)
1040 { /* Finish hashes */
1041 uschar bh
[32]; /* SHA-256 = 32 Bytes, SHA-1 = 20 Bytes */
1044 gnutls_hash_output(sig
->sha_body
, bh
);
1046 if (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)
1048 SHA1_Final (bh
, &sig
->sha1_body
);
1050 SHA256_Final(bh
, &sig
->sha2_body
);
1051 # elif defined(SHA_POLARSSL)
1052 sha1_finish(sig
->sha1_body
, bh
);
1054 sha2_finish(sig
->sha2_body
, bh
);
1060 debug_printf("PDKIM [%s] Body bytes hashed: %lu\n"
1061 "PDKIM [%s] bh computed: ",
1062 sig
->domain
, sig
->signed_body_bytes
, sig
->domain
);
1063 pdkim_hexprint((char *)bh
, sig
->algo
== PDKIM_ALGO_RSA_SHA1
? 20 : 32, 1);
1066 /* SIGNING -------------------------------------------------------------- */
1067 if (ctx
->mode
== PDKIM_MODE_SIGN
)
1069 sig
->bodyhash_len
= sig
->algo
== PDKIM_ALGO_RSA_SHA1
? 20:32;
1070 sig
->bodyhash
= CS
string_copyn(US bh
, sig
->bodyhash_len
);
1072 /* If bodylength limit is set, and we have received less bytes
1073 than the requested amount, effectively remove the limit tag. */
1074 if (sig
->signed_body_bytes
< sig
->bodylength
)
1075 sig
->bodylength
= -1;
1078 /* VERIFICATION --------------------------------------------------------- */
1081 /* Compare bodyhash */
1082 if (memcmp(bh
, sig
->bodyhash
,
1083 (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)?20:32) == 0)
1085 DEBUG(D_acl
) debug_printf("PDKIM [%s] Body hash verified OK\n", sig
->domain
);
1091 debug_printf("PDKIM [%s] bh signature: ", sig
->domain
);
1092 pdkim_hexprint(sig
->bodyhash
,
1093 sig
->algo
== PDKIM_ALGO_RSA_SHA1
? 20 : 32, 1);
1094 debug_printf("PDKIM [%s] Body hash did NOT verify\n", sig
->domain
);
1096 sig
->verify_status
= PDKIM_VERIFY_FAIL
;
1097 sig
->verify_ext_status
= PDKIM_VERIFY_FAIL_BODY
;
1107 /* -------------------------------------------------------------------------- */
1108 /* Callback from pdkim_feed below for processing complete body lines */
1111 pdkim_bodyline_complete(pdkim_ctx
*ctx
)
1113 char *p
= ctx
->linebuf
;
1114 int n
= ctx
->linebuf_offset
;
1115 pdkim_signature
*sig
= ctx
->sig
; /*XXX assumes only one sig */
1117 /* Ignore extra data if we've seen the end-of-data marker */
1118 if (ctx
->seen_eod
) goto BAIL
;
1120 /* We've always got one extra byte to stuff a zero ... */
1121 ctx
->linebuf
[ctx
->linebuf_offset
] = '\0';
1123 /* Terminate on EOD marker */
1124 if (memcmp(p
, ".\r\n", 3) == 0)
1126 /* In simple body mode, if any empty lines were buffered,
1127 replace with one. rfc 4871 3.4.3 */
1128 /*XXX checking the signed-body-bytes is a gross hack; I think
1129 it indicates that all linebreaks should be buffered, including
1130 the one terminating a text line */
1131 if ( sig
&& sig
->canon_body
== PDKIM_CANON_SIMPLE
1132 && sig
->signed_body_bytes
== 0
1133 && ctx
->num_buffered_crlf
> 0
1135 pdkim_update_bodyhash(ctx
, "\r\n", 2);
1137 ctx
->seen_eod
= TRUE
;
1141 if (memcmp(p
, "..", 2) == 0)
1147 /* Empty lines need to be buffered until we find a non-empty line */
1148 if (memcmp(p
, "\r\n", 2) == 0)
1150 ctx
->num_buffered_crlf
++;
1154 if (sig
&& sig
->canon_body
== PDKIM_CANON_RELAXED
)
1156 /* Lines with just spaces need to be buffered too */
1158 while (memcmp(check
, "\r\n", 2) != 0)
1162 if (c
!= '\t' && c
!= ' ')
1167 ctx
->num_buffered_crlf
++;
1172 /* At this point, we have a non-empty line, so release the buffered ones. */
1173 while (ctx
->num_buffered_crlf
)
1175 pdkim_update_bodyhash(ctx
, "\r\n", 2);
1176 ctx
->num_buffered_crlf
--;
1179 pdkim_update_bodyhash(ctx
, p
, n
);
1182 ctx
->linebuf_offset
= 0;
1187 /* -------------------------------------------------------------------------- */
1188 /* Callback from pdkim_feed below for processing complete headers */
1189 #define DKIM_SIGNATURE_HEADERNAME "DKIM-Signature:"
1192 pdkim_header_complete(pdkim_ctx
*ctx
)
1194 /* Special case: The last header can have an extra \r appended */
1195 if ( (ctx
->cur_header
->len
> 1) &&
1196 (ctx
->cur_header
->str
[(ctx
->cur_header
->len
)-1] == '\r') )
1198 ctx
->cur_header
->str
[(ctx
->cur_header
->len
)-1] = '\0';
1199 ctx
->cur_header
->len
--;
1203 if (ctx
->num_headers
> PDKIM_MAX_HEADERS
) goto BAIL
;
1205 /* SIGNING -------------------------------------------------------------- */
1206 if (ctx
->mode
== PDKIM_MODE_SIGN
)
1208 pdkim_signature
*sig
;
1210 for (sig
= ctx
->sig
; sig
; sig
= sig
->next
) /* Traverse all signatures */
1211 if (header_name_match(ctx
->cur_header
->str
,
1214 PDKIM_DEFAULT_SIGN_HEADERS
, 0) == PDKIM_OK
)
1216 pdkim_stringlist
*list
;
1218 /* Add header to the signed headers list (in reverse order) */
1219 if (!(list
= pdkim_prepend_stringlist(sig
->headers
,
1220 ctx
->cur_header
->str
)))
1221 return PDKIM_ERR_OOM
;
1222 sig
->headers
= list
;
1226 /* VERIFICATION ----------------------------------------------------------- */
1227 /* DKIM-Signature: headers are added to the verification list */
1228 if (ctx
->mode
== PDKIM_MODE_VERIFY
)
1230 if (strncasecmp(ctx
->cur_header
->str
,
1231 DKIM_SIGNATURE_HEADERNAME
,
1232 strlen(DKIM_SIGNATURE_HEADERNAME
)) == 0)
1234 pdkim_signature
*new_sig
;
1236 /* Create and chain new signature block */
1237 DEBUG(D_acl
) debug_printf(
1238 "PDKIM >> Found sig, trying to parse >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1240 if ((new_sig
= pdkim_parse_sig_header(ctx
, ctx
->cur_header
->str
)))
1242 pdkim_signature
*last_sig
= ctx
->sig
;
1247 while (last_sig
->next
) last_sig
= last_sig
->next
;
1248 last_sig
->next
= new_sig
;
1252 DEBUG(D_acl
) debug_printf(
1253 "Error while parsing signature header\n"
1254 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1257 /* every other header is stored for signature verification */
1260 pdkim_stringlist
*list
;
1262 if (!(list
= pdkim_prepend_stringlist(ctx
->headers
, ctx
->cur_header
->str
)))
1263 return PDKIM_ERR_OOM
;
1264 ctx
->headers
= list
;
1269 pdkim_strclear(ctx
->cur_header
); /* Re-use existing pdkim_str */
1275 /* -------------------------------------------------------------------------- */
1276 #define HEADER_BUFFER_FRAG_SIZE 256
1279 pdkim_feed (pdkim_ctx
*ctx
, char *data
, int len
)
1283 for (p
= 0; p
<len
; p
++)
1287 if (ctx
->past_headers
)
1289 /* Processing body byte */
1290 ctx
->linebuf
[ctx
->linebuf_offset
++] = c
;
1293 int rc
= pdkim_bodyline_complete(ctx
); /* End of line */
1294 if (rc
!= PDKIM_OK
) return rc
;
1296 if (ctx
->linebuf_offset
== (PDKIM_MAX_BODY_LINE_LEN
-1))
1297 return PDKIM_ERR_LONG_LINE
;
1301 /* Processing header byte */
1308 int rc
= pdkim_header_complete(ctx
); /* Seen last header line */
1309 if (rc
!= PDKIM_OK
) return rc
;
1311 ctx
->past_headers
= TRUE
;
1313 DEBUG(D_acl
) debug_printf(
1314 "PDKIM >> Hashed body data, canonicalized >>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1318 ctx
->seen_lf
= TRUE
;
1320 else if (ctx
->seen_lf
)
1322 if (!(c
== '\t' || c
== ' '))
1324 int rc
= pdkim_header_complete(ctx
); /* End of header */
1325 if (rc
!= PDKIM_OK
) return rc
;
1327 ctx
->seen_lf
= FALSE
;
1331 if (!ctx
->cur_header
)
1332 if (!(ctx
->cur_header
= pdkim_strnew(NULL
)))
1333 return PDKIM_ERR_OOM
;
1335 if (ctx
->cur_header
->len
< PDKIM_MAX_HEADER_LEN
)
1336 if (!pdkim_strncat(ctx
->cur_header
, &data
[p
], 1))
1337 return PDKIM_ERR_OOM
;
1344 * RFC 5322 specifies that header line length SHOULD be no more than 78
1349 * col: this int holds and receives column number (octets since last '\n')
1350 * str: partial string to append to
1351 * pad: padding, split line or space after before or after eg: ";"
1352 * intro: - must join to payload eg "h=", usually the tag name
1353 * payload: eg base64 data - long data can be split arbitrarily.
1355 * this code doesn't fold the header in some of the places that RFC4871
1356 * allows: As per RFC5322(2.2.3) it only folds before or after tag-value
1357 * pairs and inside long values. it also always spaces or breaks after the
1360 * no guarantees are made for output given out-of range input. like tag
1361 * names longer than 78, or bogus col. Input is assumed to be free of line breaks.
1365 pdkim_headcat(int *col
, pdkim_str
*str
, const char * pad
,
1366 const char *intro
, const char *payload
)
1375 pdkim_strcat(str
, "\r\n\t");
1378 pdkim_strncat(str
, pad
, l
);
1382 l
= (pad
?1:0) + (intro
?strlen(intro
):0);
1385 { /*can't fit intro - start a new line to make room.*/
1386 pdkim_strcat(str
, "\r\n\t");
1388 l
= intro
?strlen(intro
):0;
1391 l
+= payload
? strlen(payload
):0 ;
1394 { /* this fragment will not fit on a single line */
1397 pdkim_strcat(str
, " ");
1399 pad
= NULL
; /* only want this once */
1405 size_t sl
= strlen(intro
);
1407 pdkim_strncat(str
, intro
, sl
);
1410 intro
= NULL
; /* only want this once */
1415 size_t sl
= strlen(payload
);
1416 size_t chomp
= *col
+sl
< 77 ? sl
: 78-*col
;
1418 pdkim_strncat(str
, payload
, chomp
);
1424 /* the while precondition tells us it didn't fit. */
1425 pdkim_strcat(str
, "\r\n\t");
1431 pdkim_strcat(str
, "\r\n\t");
1438 pdkim_strcat(str
, " ");
1445 size_t sl
= strlen(intro
);
1447 pdkim_strncat(str
, intro
, sl
);
1455 size_t sl
= strlen(payload
);
1457 pdkim_strncat(str
, payload
, sl
);
1465 /* -------------------------------------------------------------------------- */
1468 pdkim_create_header(pdkim_signature
*sig
, int final
)
1471 char *base64_bh
= NULL
;
1472 char *base64_b
= NULL
;
1475 pdkim_str
*canon_all
;
1477 if (!(hdr
= pdkim_strnew("DKIM-Signature: v="PDKIM_SIGNATURE_VERSION
)))
1480 if (!(canon_all
= pdkim_strnew(pdkim_canons
[sig
->canon_headers
])))
1483 if (!(base64_bh
= pdkim_encode_base64(sig
->bodyhash
, sig
->bodyhash_len
)))
1486 col
= strlen(hdr
->str
);
1488 /* Required and static bits */
1489 if ( pdkim_headcat(&col
, hdr
, ";", "a=", pdkim_algos
[sig
->algo
])
1490 && pdkim_headcat(&col
, hdr
, ";", "q=", pdkim_querymethods
[sig
->querymethod
])
1491 && pdkim_strcat(canon_all
, "/")
1492 && pdkim_strcat(canon_all
, pdkim_canons
[sig
->canon_body
])
1493 && pdkim_headcat(&col
, hdr
, ";", "c=", canon_all
->str
)
1494 && pdkim_headcat(&col
, hdr
, ";", "d=", sig
->domain
)
1495 && pdkim_headcat(&col
, hdr
, ";", "s=", sig
->selector
)
1498 /* list of eader names can be split between items. */
1500 char *n
= strdup(sig
->headernames
);
1508 char *c
= strchr(n
, ':');
1513 if (!pdkim_headcat(&col
, hdr
, NULL
, NULL
, ":"))
1519 if (!pdkim_headcat(&col
, hdr
, s
, i
, n
))
1535 if(!pdkim_headcat(&col
, hdr
, ";", "bh=", base64_bh
))
1540 if(!pdkim_headcat(&col
, hdr
, ";", "i=", sig
->identity
))
1543 if (sig
->created
> 0)
1547 snprintf(minibuf
, 20, "%lu", sig
->created
);
1548 if(!pdkim_headcat(&col
, hdr
, ";", "t=", minibuf
))
1552 if (sig
->expires
> 0)
1556 snprintf(minibuf
, 20, "%lu", sig
->expires
);
1557 if(!pdkim_headcat(&col
, hdr
, ";", "x=", minibuf
))
1561 if (sig
->bodylength
>= 0)
1565 snprintf(minibuf
, 20, "%lu", sig
->bodylength
);
1566 if(!pdkim_headcat(&col
, hdr
, ";", "l=", minibuf
))
1570 /* Preliminary or final version? */
1573 if (!(base64_b
= pdkim_encode_base64(sig
->sigdata
, sig
->sigdata_len
)))
1575 if (!pdkim_headcat(&col
, hdr
, ";", "b=", base64_b
))
1579 if(!pdkim_headcat(&col
, hdr
, ";", "b=", ""))
1582 /* add trailing semicolon: I'm not sure if this is actually needed */
1583 if (!pdkim_headcat(&col
, hdr
, NULL
, ";", ""))
1587 rc
= strdup(hdr
->str
);
1591 if (canon_all
) pdkim_strfree(canon_all
);
1596 /* -------------------------------------------------------------------------- */
1599 pdkim_feed_finish(pdkim_ctx
*ctx
, pdkim_signature
**return_signatures
)
1601 pdkim_signature
*sig
= ctx
->sig
;
1602 pdkim_str
*headernames
= NULL
; /* Collected signed header names */
1604 /* Check if we must still flush a (partial) header. If that is the
1605 case, the message has no body, and we must compute a body hash
1606 out of '<CR><LF>' */
1607 if (ctx
->cur_header
&& ctx
->cur_header
->len
)
1609 int rc
= pdkim_header_complete(ctx
);
1610 if (rc
!= PDKIM_OK
) return rc
;
1611 pdkim_update_bodyhash(ctx
, "\r\n", 2);
1614 DEBUG(D_acl
) debug_printf(
1615 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1617 /* Build (and/or evaluate) body hash */
1618 if (pdkim_finish_bodyhash(ctx
) != PDKIM_OK
)
1619 return PDKIM_ERR_OOM
;
1621 /* SIGNING -------------------------------------------------------------- */
1622 if (ctx
->mode
== PDKIM_MODE_SIGN
)
1623 if (!(headernames
= pdkim_strnew(NULL
)))
1624 return PDKIM_ERR_OOM
;
1625 /* ---------------------------------------------------------------------- */
1630 SHA_CTX sha1_headers
;
1631 SHA256_CTX sha2_headers
;
1632 #elif defined(SHA_GNUTLS)
1633 gnutls_hash_hd_t sha_headers
;
1634 #elif defined(SHA_POLARSSL)
1635 sha1_context sha1_headers
;
1636 sha2_context sha2_headers
;
1640 char headerhash
[32];
1643 uschar
* hdata
= NULL
;
1644 int hdata_alloc
= 0;
1649 gnutls_hash_init(&sha_headers
,
1650 sig
->algo
== PDKIM_ALGO_RSA_SHA1
? GNUTLS_DIG_SHA1
: GNUTLS_DIG_SHA256
);
1652 if (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)
1654 SHA1_Init(&sha1_headers
);
1656 SHA256_Init(&sha2_headers
);
1657 # elif defined(SHA_POLARSSL)
1658 sha1_starts(&sha1_headers
);
1660 sha2_starts(&sha2_headers
, 0);
1664 DEBUG(D_acl
) debug_printf(
1665 "PDKIM >> Hashed header data, canonicalized, in sequence >>>>>>>>>>>>>>\n");
1667 /* SIGNING ---------------------------------------------------------------- */
1668 /* When signing, walk through our header list and add them to the hash. As we
1669 go, construct a list of the header's names to use for the h= parameter. */
1671 if (ctx
->mode
== PDKIM_MODE_SIGN
)
1673 pdkim_stringlist
*p
;
1675 for (p
= sig
->headers
; p
; p
= p
->next
)
1678 /* Collect header names (Note: colon presence is guaranteed here) */
1679 char *q
= strchr(p
->value
, ':');
1681 if (!(pdkim_strncat(headernames
, p
->value
,
1682 (q
-(p
->value
)) + (p
->next
? 1 : 0))))
1683 return PDKIM_ERR_OOM
;
1685 rh
= sig
->canon_headers
== PDKIM_CANON_RELAXED
1686 ? pdkim_relax_header(p
->value
, 1) /* cook header for relaxed canon */
1687 : strdup(p
->value
); /* just copy it for simple canon */
1689 return PDKIM_ERR_OOM
;
1691 /* Feed header to the hash algorithm */
1693 gnutls_hash(sha_headers
, rh
, strlen(rh
));
1695 if (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)
1697 SHA1_Update (&sha1_headers
, rh
, strlen(rh
));
1699 SHA256_Update(&sha2_headers
, rh
, strlen(rh
));
1700 # elif defined(SHA_POLARSSL)
1701 sha1_update(&sha1_headers
, US rh
, strlen(rh
));
1703 sha2_update(&sha2_headers
, US rh
, strlen(rh
));
1708 /* Remember headers block for signing */
1709 hdata
= string_append(hdata
, &hdata_alloc
, &hdata_size
, 1, rh
);
1712 DEBUG(D_acl
) pdkim_quoteprint(rh
, strlen(rh
), 1);
1717 /* VERIFICATION ----------------------------------------------------------- */
1718 /* When verifying, walk through the header name list in the h= parameter and
1719 add the headers to the hash in that order. */
1722 char *b
= strdup(sig
->headernames
);
1725 pdkim_stringlist
*hdrs
;
1727 if (!b
) return PDKIM_ERR_OOM
;
1730 for (hdrs
= ctx
->headers
; hdrs
; hdrs
= hdrs
->next
)
1735 if ((q
= strchr(p
, ':')))
1738 for (hdrs
= ctx
->headers
; hdrs
; hdrs
= hdrs
->next
)
1740 && strncasecmp(hdrs
->value
, p
, strlen(p
)) == 0
1741 && (hdrs
->value
)[strlen(p
)] == ':'
1746 rh
= sig
->canon_headers
== PDKIM_CANON_RELAXED
1747 ? pdkim_relax_header(hdrs
->value
, 1) /* cook header for relaxed canon */
1748 : strdup(hdrs
->value
); /* just copy it for simple canon */
1750 return PDKIM_ERR_OOM
;
1752 /* Feed header to the hash algorithm */
1754 gnutls_hash(sha_headers
, rh
, strlen(rh
));
1756 if (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)
1758 SHA1_Update (&sha1_headers
, rh
, strlen(rh
));
1760 SHA256_Update(&sha2_headers
, rh
, strlen(rh
));
1761 # elif defined(SHA_POLARSSL)
1762 sha1_update(&sha1_headers
, US rh
, strlen(rh
));
1764 sha2_update(&sha2_headers
, US rh
, strlen(rh
));
1768 DEBUG(D_acl
) pdkim_quoteprint(rh
, strlen(rh
), 1);
1780 DEBUG(D_acl
) debug_printf(
1781 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1783 /* SIGNING ---------------------------------------------------------------- */
1784 if (ctx
->mode
== PDKIM_MODE_SIGN
)
1786 /* Copy headernames to signature struct */
1787 sig
->headernames
= strdup(headernames
->str
);
1788 pdkim_strfree(headernames
);
1790 /* Create signature header with b= omitted */
1791 sig_hdr
= pdkim_create_header(ctx
->sig
, 0);
1794 /* VERIFICATION ----------------------------------------------------------- */
1796 sig_hdr
= strdup(sig
->rawsig_no_b_val
);
1797 /* ------------------------------------------------------------------------ */
1800 return PDKIM_ERR_OOM
;
1802 /* Relax header if necessary */
1803 if (sig
->canon_headers
== PDKIM_CANON_RELAXED
)
1805 char *relaxed_hdr
= pdkim_relax_header(sig_hdr
, 0);
1809 return PDKIM_ERR_OOM
;
1810 sig_hdr
= relaxed_hdr
;
1816 "PDKIM >> Signed DKIM-Signature header, canonicalized >>>>>>>>>>>>>>>>>\n");
1817 pdkim_quoteprint(sig_hdr
, strlen(sig_hdr
), 1);
1819 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1822 /* Finalize header hash */
1824 gnutls_hash(sha_headers
, sig_hdr
, strlen(sig_hdr
));
1825 gnutls_hash_output(sha_headers
, headerhash
);
1827 if (sig
->algo
== PDKIM_ALGO_RSA_SHA1
)
1830 SHA1_Update(&sha1_headers
, sig_hdr
, strlen(sig_hdr
));
1831 SHA1_Final(US headerhash
, &sha1_headers
);
1835 SHA256_Update(&sha2_headers
, sig_hdr
, strlen(sig_hdr
));
1836 SHA256_Final(US headerhash
, &sha2_headers
);
1838 # elif defined(SHA_POLARSSL)
1840 sha1_update(&sha1_headers
, US sig_hdr
, strlen(sig_hdr
));
1841 sha1_finish(&sha1_headers
, US headerhash
);
1845 sha2_update(&sha2_headers
, US sig_hdr
, strlen(sig_hdr
));
1846 sha2_finish(&sha2_headers
, US headerhash
);
1853 debug_printf("PDKIM [%s] hh computed: ", sig
->domain
);
1854 pdkim_hexprint(headerhash
, sig
->algo
== PDKIM_ALGO_RSA_SHA1
? 20:32, 1);
1858 if (ctx
->mode
== PDKIM_MODE_SIGN
)
1859 hdata
= string_append(hdata
, &hdata_alloc
, &hdata_size
, 1, sig_hdr
);
1864 /* SIGNING ---------------------------------------------------------------- */
1865 if (ctx
->mode
== PDKIM_MODE_SIGN
)
1871 #elif defined(RSA_GNUTLS)
1872 gnutls_x509_privkey_t rsa
;
1878 /* Import private key */
1881 if ( !(p
= Ustrstr(sig
->rsa_privkey
, "-----BEGIN RSA PRIVATE KEY-----"))
1882 || !(q
= Ustrstr(p
+=31, "-----END RSA PRIVATE KEY-----"))
1884 return PDKIM_ERR_RSA_PRIVKEY
;
1886 if ( (len
= b64decode(p
, &p
)) < 0
1887 || !(rsa
= d2i_RSAPrivateKey(NULL
, CUSS
&p
, len
))
1889 /*XXX todo: get errstring from library */
1890 return PDKIM_ERR_RSA_PRIVKEY
;
1892 #elif defined(RSA_GNUTLS)
1894 k
.data
= sig
->rsa_privkey
;
1895 k
.size
= strlen(sig
->rsa_privkey
);
1896 if ( (rc
= gnutls_x509_privkey_init(&rsa
)) != GNUTLS_E_SUCCESS
1897 || (rc
= gnutls_x509_privkey_import2(rsa
, &k
,
1898 GNUTLS_X509_FMT_PEM
, NULL
, GNUTLS_PKCS_PLAIN
)) != GNUTLS_E_SUCCESS
1901 DEBUG(D_acl
) debug_printf("gnutls_x509_privkey_import2: %s\n",
1902 gnutls_strerror(rc
));
1903 return PDKIM_ERR_RSA_PRIVKEY
;
1909 /* Allocate mem for signature */
1911 sig
->sigdata
= store_get(RSA_size(rsa
));
1912 #elif defined(RSA_GNUTLS)
1914 k
.size
= hdata_size
;
1915 (void) gnutls_x509_privkey_sign_data(rsa
,
1916 sig
->algo
== PDKIM_ALGO_RSA_SHA1
? GNUTLS_DIG_SHA1
: GNUTLS_DIG_SHA256
,
1917 0, &k
, NULL
, &sigsize
);
1918 sig
->sigdata
= store_get(sig
->sigdata_len
= sigsize
);
1924 if (RSA_sign(sig
->algo
== PDKIM_ALGO_RSA_SHA1
? NID_sha1
: NID_sha256
,
1925 CUS headerhash
, sig
->algo
== PDKIM_ALGO_RSA_SHA1
? 20 : 32,
1926 US sig
->sigdata
, (unsigned int *)&sig
->sigdata_len
,
1928 return PDKIM_ERR_RSA_SIGNING
;
1931 #elif defined(RSA_GNUTLS)
1933 if ((rc
= gnutls_x509_privkey_sign_data(rsa
,
1934 sig
->algo
== PDKIM_ALGO_RSA_SHA1
? GNUTLS_DIG_SHA1
: GNUTLS_DIG_SHA256
,
1935 0, &k
, sig
->sigdata
, &sigsize
)) != GNUTLS_E_SUCCESS
1938 DEBUG(D_acl
) debug_printf("gnutls_x509_privkey_sign_data: %s\n",
1939 gnutls_strerror(rc
));
1940 return PDKIM_ERR_RSA_SIGNING
;
1942 gnutls_x509_privkey_deinit(rsa
);
1949 debug_printf( "PDKIM [%s] b computed: ", sig
->domain
);
1950 pdkim_hexprint(sig
->sigdata
, sig
->sigdata_len
, 1);
1953 if (!(sig
->signature_header
= pdkim_create_header(ctx
->sig
, 1)))
1954 return PDKIM_ERR_OOM
;
1957 /* VERIFICATION ----------------------------------------------------------- */
1962 const unsigned char * p
;
1963 #elif defined(RSA_GNUTLS)
1964 gnutls_pubkey_t rsa
;
1965 gnutls_datum_t k
, s
;
1968 char *dns_txt_name
, *dns_txt_reply
;
1971 gnutls_pubkey_init(&rsa
);
1974 /* Fetch public key for signing domain, from DNS */
1976 if (!(dns_txt_name
= malloc(PDKIM_DNS_TXT_MAX_NAMELEN
)))
1977 return PDKIM_ERR_OOM
;
1979 if (!(dns_txt_reply
= malloc(PDKIM_DNS_TXT_MAX_RECLEN
)))
1982 return PDKIM_ERR_OOM
;
1985 memset(dns_txt_reply
, 0, PDKIM_DNS_TXT_MAX_RECLEN
);
1986 memset(dns_txt_name
, 0, PDKIM_DNS_TXT_MAX_NAMELEN
);
1988 if (snprintf(dns_txt_name
, PDKIM_DNS_TXT_MAX_NAMELEN
,
1989 "%s._domainkey.%s.",
1990 sig
->selector
, sig
->domain
) >= PDKIM_DNS_TXT_MAX_NAMELEN
)
1992 sig
->verify_status
= PDKIM_VERIFY_INVALID
;
1993 sig
->verify_ext_status
= PDKIM_VERIFY_INVALID_BUFFER_SIZE
;
1997 if ( ctx
->dns_txt_callback(dns_txt_name
, dns_txt_reply
) != PDKIM_OK
1998 || dns_txt_reply
[0] == '\0')
2000 sig
->verify_status
= PDKIM_VERIFY_INVALID
;
2001 sig
->verify_ext_status
= PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE
;
2008 "PDKIM >> Parsing public key record >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"
2010 pdkim_quoteprint(dns_txt_reply
, strlen(dns_txt_reply
), 1);
2013 if (!(sig
->pubkey
= pdkim_parse_pubkey_record(ctx
, dns_txt_reply
)))
2015 sig
->verify_status
= PDKIM_VERIFY_INVALID
;
2016 sig
->verify_ext_status
= PDKIM_VERIFY_INVALID_PUBKEY_PARSING
;
2018 DEBUG(D_acl
) debug_printf(
2019 " Error while parsing public key record\n"
2020 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
2024 DEBUG(D_acl
) debug_printf(
2025 "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
2027 /* Import public key */
2030 p
= CUS sig
->pubkey
->key
;
2031 if (!(rsa
= d2i_RSA_PUBKEY(NULL
, &p
, (long) sig
->pubkey
->key_len
)))
2033 #elif defined(RSA_GNUTLS)
2035 k
.data
= sig
->pubkey
->key
;
2036 k
.size
= sig
->pubkey
->key_len
;
2037 if ((rc
= gnutls_pubkey_import(rsa
, &k
, GNUTLS_X509_FMT_DER
))
2038 != GNUTLS_E_SUCCESS
)
2046 ERR_load_crypto_strings(); /*XXX move to a startup routine */
2047 while ((e
= ERR_get_error()))
2048 debug_printf("Az: %.120s\n", ERR_error_string(e
, NULL
));
2049 #elif defined(RSA_GNUTLS)
2050 debug_printf("gnutls_pubkey_import: %s\n", gnutls_strerror(rc
));
2054 sig
->verify_status
= PDKIM_VERIFY_INVALID
;
2055 sig
->verify_ext_status
= PDKIM_VERIFY_INVALID_PUBKEY_PARSING
;
2059 /* Check the signature */
2062 if (RSA_verify(sig
->algo
== PDKIM_ALGO_RSA_SHA1
? NID_sha1
: NID_sha256
,
2063 CUS headerhash
, sig
->algo
== PDKIM_ALGO_RSA_SHA1
? 20 : 32,
2064 US sig
->sigdata
, (unsigned int)sig
->sigdata_len
,
2067 #elif defined(RSA_GNUTLS)
2069 k
.data
= headerhash
;
2070 k
.size
= sig
->algo
== PDKIM_ALGO_RSA_SHA1
? 20 : 32;
2071 s
.data
= sig
->sigdata
;
2072 s
.size
= sig
->sigdata_len
;
2073 if ((rc
= gnutls_pubkey_verify_hash2(rsa
,
2074 sig
->algo
== PDKIM_ALGO_RSA_SHA1
2075 ? GNUTLS_SIGN_RSA_SHA1
: GNUTLS_SIGN_RSA_SHA256
,
2080 #if defined(RSA_GNUTLS)
2081 debug_printf("gnutls_pubkey_verify_hash2: %s\n", gnutls_strerror(rc
));
2083 sig
->verify_status
= PDKIM_VERIFY_FAIL
;
2084 sig
->verify_ext_status
= PDKIM_VERIFY_FAIL_MESSAGE
;
2088 /* We have a winner! (if bodydhash was correct earlier) */
2089 if (sig
->verify_status
== PDKIM_VERIFY_NONE
)
2090 sig
->verify_status
= PDKIM_VERIFY_PASS
;
2096 debug_printf("PDKIM [%s] signature status: %s",
2097 sig
->domain
, pdkim_verify_status_str(sig
->verify_status
));
2098 if (sig
->verify_ext_status
> 0)
2099 debug_printf(" (%s)\n",
2100 pdkim_verify_ext_status_str(sig
->verify_ext_status
));
2106 gnutls_pubkey_deinit(rsa
);
2109 free(dns_txt_reply
);
2115 /* If requested, set return pointer to signature(s) */
2116 if (return_signatures
)
2117 *return_signatures
= ctx
->sig
;
2123 /* -------------------------------------------------------------------------- */
2125 DLLEXPORT pdkim_ctx
*
2126 pdkim_init_verify(int(*dns_txt_callback
)(char *, char *))
2128 pdkim_ctx
*ctx
= malloc(sizeof(pdkim_ctx
));
2132 memset(ctx
, 0, sizeof(pdkim_ctx
));
2134 if (!(ctx
->linebuf
= malloc(PDKIM_MAX_BODY_LINE_LEN
)))
2140 ctx
->mode
= PDKIM_MODE_VERIFY
;
2141 ctx
->dns_txt_callback
= dns_txt_callback
;
2147 /* -------------------------------------------------------------------------- */
2149 DLLEXPORT pdkim_ctx
*
2150 pdkim_init_sign(char *domain
, char *selector
, char *rsa_privkey
, int algo
)
2153 pdkim_signature
*sig
;
2155 if (!domain
|| !selector
|| !rsa_privkey
)
2158 if (!(ctx
= malloc(sizeof(pdkim_ctx
))))
2160 memset(ctx
, 0, sizeof(pdkim_ctx
));
2162 if (!(ctx
->linebuf
= malloc(PDKIM_MAX_BODY_LINE_LEN
)))
2168 if (!(sig
= malloc(sizeof(pdkim_signature
))))
2174 memset(sig
, 0, sizeof(pdkim_signature
));
2176 sig
->bodylength
= -1;
2178 ctx
->mode
= PDKIM_MODE_SIGN
;
2181 ctx
->sig
->domain
= strdup(domain
);
2182 ctx
->sig
->selector
= strdup(selector
);
2183 ctx
->sig
->rsa_privkey
= strdup(rsa_privkey
);
2184 ctx
->sig
->algo
= algo
;
2186 if (!ctx
->sig
->domain
|| !ctx
->sig
->selector
|| !ctx
->sig
->rsa_privkey
)
2190 SHA1_Init (&ctx
->sig
->sha1_body
);
2191 SHA256_Init(&ctx
->sig
->sha2_body
);
2193 #elif defined(SHA_GNUTLS)
2194 gnutls_hash_init(&ctx
->sig
->sha_body
,
2195 algo
== PDKIM_ALGO_RSA_SHA1
? GNUTLS_DIG_SHA1
: GNUTLS_DIG_SHA256
);
2197 #elif defined(SHA_POLARSSL)
2198 if (!(ctx
->sig
->sha1_body
= malloc(sizeof(sha1_context
))))
2200 sha1_starts(ctx
->sig
->sha1_body
);
2202 if (!(ctx
->sig
->sha2_body
= malloc(sizeof(sha2_context
))))
2204 sha2_starts(ctx
->sig
->sha2_body
, 0);
2211 pdkim_free_ctx(ctx
);
2216 /* -------------------------------------------------------------------------- */
2219 pdkim_set_optional(pdkim_ctx
*ctx
,
2225 unsigned long created
,
2226 unsigned long expires
)
2229 if (!(ctx
->sig
->identity
= strdup(identity
)))
2230 return PDKIM_ERR_OOM
;
2233 if (!(ctx
->sig
->sign_headers
= strdup(sign_headers
)))
2234 return PDKIM_ERR_OOM
;
2236 ctx
->sig
->canon_headers
= canon_headers
;
2237 ctx
->sig
->canon_body
= canon_body
;
2238 ctx
->sig
->bodylength
= bodylength
;
2239 ctx
->sig
->created
= created
;
2240 ctx
->sig
->expires
= expires
;
2246 #endif /*DISABLE_DKIM*/