-/* $Cambridge: exim/src/src/pdkim/pdkim.c,v 1.1.2.4 2009/02/26 16:07:36 tom Exp $ */
+/* $Cambridge: exim/src/src/pdkim/pdkim.c,v 1.1.2.5 2009/02/27 17:04:20 tom Exp $ */
/* pdkim.c */
#include <stdlib.h>
if (lf)
fputc('\n',stream);
}
+void pdkim_hexprint(FILE *stream, char *data, int len, int lf) {
+ int i;
+ unsigned char *p = (unsigned char *)data;
+
+ for (i=0;i<len;i++) {
+ int c = p[i];
+ fprintf(stream,"%02x ",c);
+ }
+ if (lf)
+ fputc('\n',stream);
+}
#endif
/* -------------------------------------------------------------------------- */
/* Matches the name of the passed raw "header" against
- the passed colon-separated "list". Case-insensitive.
- Returns '0' for a match. */
+ the passed colon-separated "list", starting at entry
+ "start". Returns the position of the header name in
+ the list. */
int header_name_match(char *header,
- char *list) {
+ char *list,
+ int start) {
char *hname;
char *lcopy;
char *p;
char *q;
+ int pos = 0;
int rc = PDKIM_FAIL;
char *hcolon = strchr(header,':');
if (hcolon == NULL) return rc; /* This isn't a header */
q = strchr(p,':');
while (q != NULL) {
*q = '\0';
- if (strcasecmp(p,hname) == 0) {
- rc = PDKIM_OK;
- goto BAIL;
+ if (pos >= start) {
+ if (strcasecmp(p,hname) == 0) {
+ rc = pos;
+ goto BAIL;
+ }
}
p = q+1;
q = strchr(p,':');
+ pos++;
+ }
+ if (pos >= start) {
+ if (strcasecmp(p,hname) == 0)
+ rc = pos;
}
- if (strcasecmp(p,hname) == 0) rc = PDKIM_OK;
BAIL:
free(hname);
free(lcopy);
/* -------------------------------------------------------------------------- */
-char *pdkim_decode_base64(char *str) {
+char *pdkim_decode_base64(char *str, int *num_decoded) {
int dlen = 0;
char *res;
- base64_decode(NULL, &dlen, str, strlen(str));
+ base64_decode(NULL, &dlen, (unsigned char *)str, strlen(str));
res = malloc(dlen+1);
if (res == NULL) return NULL;
- if (base64_decode(res,&dlen,str,strlen(str)) != 0) {
+ if (base64_decode((unsigned char *)res,&dlen,(unsigned char *)str,strlen(str)) != 0) {
+ free(res);
+ return NULL;
+ }
+ if (num_decoded != NULL) *num_decoded = dlen;
+ return res;
+}
+
+/* -------------------------------------------------------------------------- */
+char *pdkim_encode_base64(char *str, int num) {
+ int dlen = 0;
+ char *res;
+
+ base64_encode(NULL, &dlen, (unsigned char *)str, num);
+ res = malloc(dlen+1);
+ if (res == NULL) return NULL;
+ if (base64_encode((unsigned char *)res,&dlen,(unsigned char *)str,num) != 0) {
free(res);
return NULL;
}
#define PDKIM_HDR_VALUE 2
pdkim_signature *pdkim_parse_sig_header(pdkim_ctx *ctx, char *raw_hdr) {
pdkim_signature *sig ;
- char *rawsig_no_b_val;
char *p,*q;
pdkim_str *cur_tag = NULL;
pdkim_str *cur_val = NULL;
case 'b':
switch (cur_tag->str[1]) {
case 'h':
- sig->bodyhash = pdkim_decode_base64(cur_val->str);
+ sig->bodyhash = pdkim_decode_base64(cur_val->str,&(sig->bodyhash_len));
break;
default:
- sig->sigdata = pdkim_decode_base64(cur_val->str);
+ sig->sigdata = pdkim_decode_base64(cur_val->str,&(sig->sigdata_len));
break;
}
break;
if (!(sig->domain && (*(sig->domain) != '\0') &&
sig->selector && (*(sig->selector) != '\0') &&
sig->headernames && (*(sig->headernames) != '\0') &&
+ sig->bodyhash && (*(sig->bodyhash) != '\0') &&
+ sig->sigdata && (*(sig->sigdata) != '\0') &&
sig->version)) {
- pdkim_free_signature(sig);
+ pdkim_free_sig(sig);
return NULL;
}
"PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
}
#endif
+
+ sha1_starts(&(sig->sha1_body));
+ sha2_starts(&(sig->sha2_body),0);
+
return sig;
}
/* Traverse all signatures */
while (sig != NULL) {
-#ifdef PDKIM_DEBUG
- if (ctx->debug_stream)
- fprintf(ctx->debug_stream, "PDKIM [%s] Body bytes hashed: %lu\n",
- sig->domain, sig->signed_body_bytes);
-#endif
-
/* Finish hashes */
unsigned char bh[32]; /* SHA-256 = 32 Bytes, SHA-1 = 20 Bytes */
if (sig->algo == PDKIM_ALGO_RSA_SHA1)
else
sha2_finish(&(sig->sha2_body),bh);
+ #ifdef PDKIM_DEBUG
+ if (ctx->debug_stream) {
+ fprintf(ctx->debug_stream, "PDKIM [%s] Body bytes hashed: %lu\n",
+ sig->domain, sig->signed_body_bytes);
+ fprintf(ctx->debug_stream, "PDKIM [%s] bh computed: ", sig->domain);
+ pdkim_hexprint(ctx->debug_stream, (char *)bh,
+ (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32,1);
+ }
+ #endif
+
/* SIGNING -------------------------------------------------------------- */
if (ctx->mode == PDKIM_MODE_SIGN) {
-
- /* Build base64 version of body hash and place it in the sig struct */
- int slen = (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32;
- int dlen = 0;
- base64_encode(NULL,&dlen,bh,slen); /* Puts needed length in dlen */
- sig->bodyhash = malloc(dlen+1);
+ sig->bodyhash_len = (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32;
+ sig->bodyhash = malloc(sig->bodyhash_len);
if (sig->bodyhash == NULL) return PDKIM_ERR_OOM;
- if (base64_encode((unsigned char *)sig->bodyhash,&dlen,bh,slen) == 0) {
- sig->bodyhash[dlen] = '\0';
-#ifdef PDKIM_DEBUG
- if (ctx->debug_stream)
- fprintf(ctx->debug_stream, "PDKIM [%s] body hash: %s\n",
- sig->domain, sig->bodyhash);
-#endif
- return PDKIM_OK;
- }
+ memcpy(sig->bodyhash,bh,sig->bodyhash_len);
/* If bodylength limit is set, and we have received less bytes
than the requested amount, effectively remove the limit tag. */
}
/* VERIFICATION --------------------------------------------------------- */
else {
-
+ /* Compare bodyhash */
+ if (memcmp(bh,sig->bodyhash,
+ (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32) == 0) {
+ #ifdef PDKIM_DEBUG
+ if (ctx->debug_stream)
+ fprintf(ctx->debug_stream, "PDKIM [%s] Body hash verified OK\n",
+ sig->domain);
+ #endif
+ }
+ else {
+ #ifdef PDKIM_DEBUG
+ if (ctx->debug_stream) {
+ fprintf(ctx->debug_stream, "PDKIM [%s] Body hash did NOT verify\n",
+ sig->domain);
+ fprintf(ctx->debug_stream, "PDKIM [%s] bh signature: ", sig->domain);
+ pdkim_hexprint(ctx->debug_stream, sig->bodyhash,
+ (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32,1);
+ }
+ #endif
+ sig->verify_status = PDKIM_VERIFY_FAIL;
+ sig->verify_ext_status = PDKIM_VERIFY_FAIL_BODY;
+ }
}
-
sig = sig->next;
}
/* SIGNING -------------------------------------------------------------- */
if (ctx->mode == PDKIM_MODE_SIGN) {
if (header_name_match(ctx->cur_header->str,
- sig->sign_headers?sig->sign_headers
- :PDKIM_DEFAULT_SIGN_HEADERS) == 0) {
- pdkim_stringlist *list = pdkim_append_stringlist(sig->headers,
- ctx->cur_header->str);
- if (list == NULL) return PDKIM_ERR_OOM;
- sig->headers = list;
- }
+ sig->sign_headers?
+ sig->sign_headers:
+ PDKIM_DEFAULT_SIGN_HEADERS, 0) < 0) goto NEXT_SIG;
}
/* VERIFICATION --------------------------------------------------------- */
else {
-
+ int rc = header_name_match(ctx->cur_header->str,
+ sig->headernames,
+ sig->headernames_pos);
+ /* Header is not included or out-of-sequence */
+ if (rc < 0) goto NEXT_SIG;
+ sig->headernames_pos = rc;
}
+ /* Add header to the signed headers list */
+ pdkim_stringlist *list = pdkim_append_stringlist(sig->headers,
+ ctx->cur_header->str);
+ if (list == NULL) return PDKIM_ERR_OOM;
+ sig->headers = list;
+
+ NEXT_SIG:
sig = sig->next;
}
fprintf(ctx->debug_stream,
"PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
}
- #endif
+ #endif
}
}
/* -------------------------------------------------------------------------- */
-pdkim_str *pdkim_create_header(pdkim_signature *sig, int final) {
-
+char *pdkim_create_header(pdkim_signature *sig, int final) {
+ char *rc = NULL;
+ char *base64_bh = NULL;
+ char *base64_b = NULL;
pdkim_str *hdr = pdkim_strnew("DKIM-Signature: v="PDKIM_SIGNATURE_VERSION);
if (hdr == NULL) return NULL;
+
+ base64_bh = pdkim_encode_base64(sig->bodyhash, sig->bodyhash_len);
+ if (base64_bh == NULL) goto BAIL;
+
/* Required and static bits */
if (
pdkim_strcat(hdr,"; a=") &&
pdkim_strcat(hdr,";\r\n\th=") &&
pdkim_strcat(hdr,sig->headernames) &&
pdkim_strcat(hdr,"; bh=") &&
- pdkim_strcat(hdr,sig->bodyhash) &&
+ pdkim_strcat(hdr,base64_bh) &&
pdkim_strcat(hdr,";\r\n\t")
) {
/* Optional bits */
if (!( pdkim_strcat(hdr,"i=") &&
pdkim_strcat(hdr,sig->identity) &&
pdkim_strcat(hdr,";") ) ) {
- return NULL;
+ goto BAIL;
}
}
if (sig->created > 0) {
if (!( pdkim_strcat(hdr,"t=") &&
pdkim_numcat(hdr,sig->created) &&
pdkim_strcat(hdr,";") ) ) {
- return NULL;
+ goto BAIL;
}
}
if (sig->expires > 0) {
if (!( pdkim_strcat(hdr,"x=") &&
pdkim_numcat(hdr,sig->expires) &&
pdkim_strcat(hdr,";") ) ) {
- return NULL;
+ goto BAIL;
}
}
if (sig->bodylength > 0) {
if (!( pdkim_strcat(hdr,"l=") &&
pdkim_numcat(hdr,sig->bodylength) &&
pdkim_strcat(hdr,";") ) ) {
- return NULL;
+ goto BAIL;
}
}
/* Extra linebreak */
if (hdr->str[(hdr->len)-1] == ';') {
- if (!pdkim_strcat(hdr," \r\n\t")) return NULL;
+ if (!pdkim_strcat(hdr," \r\n\t")) goto BAIL;
}
/* Preliminary or final version? */
if (final) {
+ base64_b = pdkim_encode_base64(sig->sigdata, sig->sigdata_len);
+ if (base64_b == NULL) goto BAIL;
if (
pdkim_strcat(hdr,"b=") &&
- pdkim_strcat(hdr,sig->sigdata) &&
+ pdkim_strcat(hdr,base64_b) &&
pdkim_strcat(hdr,";")
- ) return hdr;
+ ) goto DONE;
}
else {
- if (pdkim_strcat(hdr,"b=;")) return hdr;
+ if (pdkim_strcat(hdr,"b=;")) goto DONE;
}
+
+ goto BAIL;
}
- return NULL;
+
+ DONE:
+ rc = strdup(hdr->str);
+
+ BAIL:
+ pdkim_strfree(hdr);
+ if (base64_bh != NULL) free(base64_bh);
+ if (base64_b != NULL) free(base64_b);
+ return rc;
}
/* -------------------------------------------------------------------------- */
int pdkim_feed_finish(pdkim_ctx *ctx, char **signature) {
+ pdkim_signature *sig = ctx->sig;
+ pdkim_str *headernames = NULL; /* Collected signed header names */
/* Check if we must still flush a (partial) header. If that is the
case, the message has no body, and we must compute a body hash
pdkim_update_bodyhash(ctx, ctx->linebuf, ctx->linebuf_offset);
pdkim_update_bodyhash(ctx,"\r\n",2);
}
-#ifdef PDKIM_DEBUG
+ #ifdef PDKIM_DEBUG
if (ctx->debug_stream)
fprintf(ctx->debug_stream,
"\nPDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
-#endif
+ #endif
}
+ /* Build (and/or evaluate) body hash */
if (pdkim_finish_bodyhash(ctx) != PDKIM_OK) return PDKIM_ERR_OOM;
- /* SIGNING ---------------------------------------------------------------- */
+ /* SIGNING -------------------------------------------------------------- */
if (ctx->mode == PDKIM_MODE_SIGN) {
- pdkim_stringlist *p;
- pdkim_str *headernames;
- pdkim_str *hdr;
- char *canon_signature;
- unsigned char headerhash[32];
- char *headerhash_base64;
- char *rsa_sig;
- int sigdata_len = 0;
+ headernames = pdkim_strnew(NULL);
+ if (headernames == NULL) return PDKIM_ERR_OOM;
+ }
+ /* ---------------------------------------------------------------------- */
+
+ while (sig != NULL) {
sha1_context sha1_headers;
sha2_context sha2_headers;
- rsa_context rsa;
- if (ctx->sig->algo == PDKIM_ALGO_RSA_SHA1) sha1_starts(&sha1_headers);
- else sha2_starts(&sha2_headers,0);
- /* Run through the accumulated list of to-be-signed headers */
-#ifdef PDKIM_DEBUG
+ pdkim_stringlist *p = sig->headers;
+ char *sig_hdr;
+ char headerhash[32];
+
+ if (sig->algo == PDKIM_ALGO_RSA_SHA1)
+ sha1_starts(&sha1_headers);
+ else
+ sha2_starts(&sha2_headers,0);
+
+ #ifdef PDKIM_DEBUG
if (ctx->debug_stream)
fprintf(ctx->debug_stream,
"PDKIM >> Hashed header data, canonicalized, in sequence >>>>>>>>>>>>>>\n");
-#endif
- headernames = pdkim_strnew(NULL);
- p = ctx->sig->headers;
+ #endif
+
while (p != NULL) {
- char *rh = p->value;
- /* Collect header names (Note: colon presence is guaranteed here) */
- char *q = strchr(p->value,':');
- if (pdkim_strncat(headernames, p->value,
- (q-(p->value))+((p->next==NULL)?0:1)) == NULL)
- return PDKIM_ERR_OOM;
- /* Cook the header if using relaxed canon */
- if (ctx->sig->canon_body == PDKIM_CANON_RELAXED) {
- rh = pdkim_relax_header(p->value,1);
- if (rh == NULL) return PDKIM_ERR_OOM;
+ char *rh;
+
+ /* SIGNING -------------------------------------------------------------- */
+ if (ctx->mode == PDKIM_MODE_SIGN) {
+ /* Collect header names (Note: colon presence is guaranteed here) */
+ char *q = strchr(p->value,':');
+ if (pdkim_strncat(headernames, p->value,
+ (q-(p->value))+((p->next==NULL)?0:1)) == NULL)
+ return PDKIM_ERR_OOM;
}
+ /* ---------------------------------------------------------------------- */
+
+ if (sig->canon_body == PDKIM_CANON_RELAXED)
+ rh = pdkim_relax_header(p->value,1); /* cook header for relaxed canon */
+ else
+ rh = strdup(p->value); /* just copy it for simple canon */
+
+ if (rh == NULL) return PDKIM_ERR_OOM;
+
/* Feed header to the hash algorithm */
- if (ctx->sig->algo == PDKIM_ALGO_RSA_SHA1)
+ if (sig->algo == PDKIM_ALGO_RSA_SHA1)
sha1_update(&(sha1_headers),(unsigned char *)rh,strlen(rh));
else
sha2_update(&(sha2_headers),(unsigned char *)rh,strlen(rh));
-#ifdef PDKIM_DEBUG
+ #ifdef PDKIM_DEBUG
if (ctx->debug_stream)
pdkim_quoteprint(ctx->debug_stream, rh, strlen(rh), 1);
-#endif
+ #endif
+ free(rh);
p = p->next;
}
-#ifdef PDKIM_DEBUG
+ #ifdef PDKIM_DEBUG
if (ctx->debug_stream)
fprintf(ctx->debug_stream,
"PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
-#endif
+ #endif
- /* Copy headernames to signature struct */
- ctx->sig->headernames = malloc((headernames->len)+1);
- if (ctx->sig->headernames == NULL) return PDKIM_ERR_OOM;
- strcpy(ctx->sig->headernames, headernames->str);
- pdkim_strfree(headernames);
-
- /* Create signature header with b= omitted */
- hdr = pdkim_create_header(ctx->sig,0);
- if (hdr == NULL) return PDKIM_ERR_OOM;
-
- /* If necessary, perform relaxed canon */
- canon_signature = hdr->str;
- if (ctx->sig->canon_headers == PDKIM_CANON_RELAXED) {
- canon_signature = pdkim_relax_header(canon_signature,0);
- if (canon_signature == NULL) return PDKIM_ERR_OOM;
- }
-#ifdef PDKIM_DEBUG
- if (ctx->debug_stream) {
- fprintf(ctx->debug_stream,
- "PDKIM >> Signed DKIM-Signature header, canonicalized >>>>>>>>>>>>>>>>>\n");
- pdkim_quoteprint(ctx->debug_stream, canon_signature, strlen(canon_signature), 1);
- fprintf(ctx->debug_stream,
- "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
- }
-#endif
+ /* SIGNING ---------------------------------------------------------------- */
+ if (ctx->mode == PDKIM_MODE_SIGN) {
+ /* Copy headernames to signature struct */
+ sig->headernames = strdup(headernames->str);
+ pdkim_strfree(headernames);
- /* Feed preliminary signature header to the hash algorithm */
- if (ctx->sig->algo == PDKIM_ALGO_RSA_SHA1) {
- int dlen = 0;
- sha1_update(&(sha1_headers),(unsigned char *)canon_signature,strlen(canon_signature));
- sha1_finish(&(sha1_headers),headerhash);
- base64_encode(NULL,&dlen,headerhash,20);
- headerhash_base64 = malloc(dlen+1);
- if (headerhash == NULL) return PDKIM_ERR_OOM;
- base64_encode((unsigned char *)headerhash_base64,&dlen,headerhash,20);
- headerhash_base64[dlen] = '\0';
-#ifdef PDKIM_DEBUG
- if (ctx->debug_stream)
- fprintf(ctx->debug_stream,
- "PDKIM SHA1 header hash: %s\n",headerhash_base64);
-#endif
+ /* Create signature header with b= omitted */
+ sig_hdr = pdkim_create_header(ctx->sig,0);
}
+ /* VERIFICATION ----------------------------------------------------------- */
else {
- int dlen = 0;
- sha2_update(&(sha2_headers),(unsigned char *)canon_signature,strlen(canon_signature));
- sha2_finish(&(sha2_headers),headerhash);
- base64_encode(NULL,&dlen,headerhash,32);
- headerhash_base64 = malloc(dlen+1);
- if (headerhash == NULL) return PDKIM_ERR_OOM;
- base64_encode((unsigned char *)headerhash_base64,&dlen,headerhash,32);
- headerhash_base64[dlen] = '\0';
-#ifdef PDKIM_DEBUG
- if (ctx->debug_stream)
- fprintf(ctx->debug_stream,
- "PDKIM SHA256 header hash: %s\n",headerhash_base64);
-#endif
+ sig_hdr = strdup(sig->rawsig_no_b_val);
}
+ /* ------------------------------------------------------------------------ */
- if (rsa_parse_key(&rsa, (unsigned char *)ctx->sig->rsa_privkey,
- strlen(ctx->sig->rsa_privkey), NULL, 0) != 0) {
- return PDKIM_ERR_RSA_PRIVKEY;
- }
+ if (sig_hdr == NULL) return PDKIM_ERR_OOM;
- rsa_sig = malloc(mpi_size(&(rsa.N)));
- if (rsa_sig == NULL) return PDKIM_ERR_OOM;
-
- if (rsa_pkcs1_sign( &rsa, RSA_PRIVATE,
- ((ctx->sig->algo == PDKIM_ALGO_RSA_SHA1)?
- RSA_SHA1
- :
- RSA_SHA256
- ),
- 0, headerhash, (unsigned char *)rsa_sig ) != 0) {
- return PDKIM_ERR_RSA_SIGNING;
+ /* Relax header if necessary */
+ if (sig->canon_headers == PDKIM_CANON_RELAXED) {
+ char *relaxed_hdr = pdkim_relax_header(sig_hdr,0);
+ free(sig_hdr);
+ if (relaxed_hdr == NULL) return PDKIM_ERR_OOM;
+ sig_hdr = relaxed_hdr;
}
- base64_encode(NULL,&sigdata_len,(unsigned char *)rsa_sig,mpi_size(&(rsa.N)));
- ctx->sig->sigdata = malloc(sigdata_len+1);
- if (ctx->sig->sigdata == NULL) return PDKIM_ERR_OOM;
- base64_encode((unsigned char *)ctx->sig->sigdata,
- &sigdata_len,
- (unsigned char *)rsa_sig,
- mpi_size(&(rsa.N)));
- ctx->sig->sigdata[sigdata_len] = '\0';
-
-#ifdef PDKIM_DEBUG
- if (ctx->debug_stream)
- fprintf(ctx->debug_stream,
- "PDKIM RSA-signed hash: %s\n",ctx->sig->sigdata);
-#endif
-
- /* Recreate signature header with b= included */
- pdkim_strfree(hdr);
- hdr = pdkim_create_header(ctx->sig,1);
- if (hdr == NULL) return PDKIM_ERR_OOM;
-
-#ifdef PDKIM_DEBUG
+ #ifdef PDKIM_DEBUG
if (ctx->debug_stream) {
fprintf(ctx->debug_stream,
- "PDKIM >> Final DKIM-Signature header >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
- pdkim_quoteprint(ctx->debug_stream, hdr->str, hdr->len, 1);
+ "PDKIM >> Signed DKIM-Signature header, canonicalized >>>>>>>>>>>>>>>>>\n");
+ pdkim_quoteprint(ctx->debug_stream, sig_hdr, strlen(sig_hdr), 1);
fprintf(ctx->debug_stream,
"PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
}
-#endif
+ #endif
- if (signature != NULL) {
- *signature = hdr->str;
+ /* Finalize header hash */
+ if (sig->algo == PDKIM_ALGO_RSA_SHA1) {
+ sha1_update(&(sha1_headers),(unsigned char *)sig_hdr,strlen(sig_hdr));
+ sha1_finish(&(sha1_headers),(unsigned char *)headerhash);
+ }
+ else {
+ sha2_update(&(sha2_headers),(unsigned char *)sig_hdr,strlen(sig_hdr));
+ sha2_finish(&(sha2_headers),(unsigned char *)headerhash);
}
- }
+ free(sig_hdr);
+
+ /* SIGNING ---------------------------------------------------------------- */
+ if (ctx->mode == PDKIM_MODE_SIGN) {
+ rsa_context rsa;
+
+ /* Perform private key operation */
+ if (rsa_parse_key(&rsa, (unsigned char *)sig->rsa_privkey,
+ strlen(sig->rsa_privkey), NULL, 0) != 0) {
+ return PDKIM_ERR_RSA_PRIVKEY;
+ }
+
+ sig->sigdata_len = mpi_size(&(rsa.N));
+ sig->sigdata = malloc(sig->sigdata_len);
+ if (sig->sigdata == NULL) return PDKIM_ERR_OOM;
+
+ if (rsa_pkcs1_sign( &rsa, RSA_PRIVATE,
+ ((sig->algo == PDKIM_ALGO_RSA_SHA1)?
+ RSA_SHA1:RSA_SHA256),
+ 0,
+ (unsigned char *)headerhash,
+ (unsigned char *)sig->sigdata ) != 0) {
+ return PDKIM_ERR_RSA_SIGNING;
+ }
+
+ rsa_free(&rsa);
+
+ #ifdef PDKIM_DEBUG
+ if (ctx->debug_stream) {
+ fprintf(ctx->debug_stream, "PDKIM [%s] b computed: ",
+ sig->domain);
+ pdkim_hexprint(ctx->debug_stream, sig->sigdata, sig->sigdata_len, 1);
+ }
+ #endif
+
+ /* Recreate signature header with b= included, return it to the caller */
+ if (signature != NULL) {
+ *signature = pdkim_create_header(ctx->sig,1);
+ if (*signature == NULL) return PDKIM_ERR_OOM;
+ }
+ }
+ /* VERIFICATION ----------------------------------------------------------- */
+ else {
+ }
+
+ sig = sig->next;
+ }
return PDKIM_OK;
}
git://git.exim.org / users / jgh / exim.git / commitdiff