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* PDKIM - a RFC4871 (DKIM) implementation
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* Copyright (C) 2009 Tom Kistner <tom@duncanthrax.net>
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* http://duncanthrax.net/pdkim/
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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/* $Cambridge: exim/exim-src/src/pdkim/pdkim.c,v 1.11 2009/11/23 12:34:51 nm4 Exp $ */
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#define PDKIM_SIGNATURE_VERSION "1"
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#define PDKIM_PUB_RECORD_VERSION "DKIM1"
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#define PDKIM_MAX_HEADER_LEN 65536
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#define PDKIM_MAX_HEADERS 512
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#define PDKIM_MAX_BODY_LINE_LEN 16384
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#define PDKIM_DNS_TXT_MAX_NAMELEN 1024
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#define PDKIM_DEFAULT_SIGN_HEADERS "From:Sender:Reply-To:Subject:Date:"\
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"Message-ID:To:Cc:MIME-Version:Content-Type:"\
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"Content-Transfer-Encoding:Content-ID:"\
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"Content-Description:Resent-Date:Resent-From:"\
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"Resent-Sender:Resent-To:Resent-Cc:"\
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"Resent-Message-ID:In-Reply-To:References:"\
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"List-Id:List-Help:List-Unsubscribe:"\
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"List-Subscribe:List-Post:List-Owner:List-Archive"
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/* -------------------------------------------------------------------------- */
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struct pdkim_stringlist {
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#define PDKIM_STR_ALLOC_FRAG 256
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unsigned int allocated;
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/* -------------------------------------------------------------------------- */
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/* A bunch of list constants */
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char *pdkim_querymethods[] = {
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char *pdkim_algos[] = {
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char *pdkim_canons[] = {
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char *pdkim_hashes[] = {
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char *pdkim_keytypes[] = {
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typedef struct pdkim_combined_canon_entry {
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} pdkim_combined_canon_entry;
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pdkim_combined_canon_entry pdkim_combined_canons[] = {
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{ "simple/simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE },
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{ "simple/relaxed", PDKIM_CANON_SIMPLE, PDKIM_CANON_RELAXED },
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{ "relaxed/simple", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE },
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{ "relaxed/relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_RELAXED },
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{ "simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE },
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{ "relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE },
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char *pdkim_verify_status_str(int status) {
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case PDKIM_VERIFY_NONE: return "PDKIM_VERIFY_NONE";
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case PDKIM_VERIFY_INVALID: return "PDKIM_VERIFY_INVALID";
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case PDKIM_VERIFY_FAIL: return "PDKIM_VERIFY_FAIL";
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case PDKIM_VERIFY_PASS: return "PDKIM_VERIFY_PASS";
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default: return "PDKIM_VERIFY_UNKNOWN";
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char *pdkim_verify_ext_status_str(int ext_status) {
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case PDKIM_VERIFY_FAIL_BODY: return "PDKIM_VERIFY_FAIL_BODY";
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case PDKIM_VERIFY_FAIL_MESSAGE: return "PDKIM_VERIFY_FAIL_MESSAGE";
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case PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE: return "PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE";
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case PDKIM_VERIFY_INVALID_BUFFER_SIZE: return "PDKIM_VERIFY_INVALID_BUFFER_SIZE";
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case PDKIM_VERIFY_INVALID_PUBKEY_PARSING: return "PDKIM_VERIFY_INVALID_PUBKEY_PARSING";
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default: return "PDKIM_VERIFY_UNKNOWN";
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/* -------------------------------------------------------------------------- */
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/* Print debugging functions */
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void pdkim_quoteprint(FILE *stream, char *data, int len, int lf) {
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unsigned char *p = (unsigned char *)data;
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for (i=0;i<len;i++) {
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case ' ' : fprintf(stream,"{SP}"); break;
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case '\t': fprintf(stream,"{TB}"); break;
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case '\r': fprintf(stream,"{CR}"); break;
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case '\n': fprintf(stream,"{LF}"); break;
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case '{' : fprintf(stream,"{BO}"); break;
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case '}' : fprintf(stream,"{BC}"); break;
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if ( (c < 32) || (c > 127) )
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fprintf(stream,"{%02x}",c);
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void pdkim_hexprint(FILE *stream, char *data, int len, int lf) {
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unsigned char *p = (unsigned char *)data;
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for (i=0;i<len;i++) {
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fprintf(stream,"%02x",c);
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/* -------------------------------------------------------------------------- */
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/* Simple string list implementation for convinience */
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pdkim_stringlist *pdkim_append_stringlist(pdkim_stringlist *base, char *str) {
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pdkim_stringlist *new_entry = malloc(sizeof(pdkim_stringlist));
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if (new_entry == NULL) return NULL;
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memset(new_entry,0,sizeof(pdkim_stringlist));
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new_entry->value = strdup(str);
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if (new_entry->value == NULL) return NULL;
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pdkim_stringlist *last = base;
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while (last->next != NULL) { last = last->next; }
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last->next = new_entry;
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else return new_entry;
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pdkim_stringlist *pdkim_prepend_stringlist(pdkim_stringlist *base, char *str) {
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pdkim_stringlist *new_entry = malloc(sizeof(pdkim_stringlist));
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if (new_entry == NULL) return NULL;
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memset(new_entry,0,sizeof(pdkim_stringlist));
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new_entry->value = strdup(str);
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if (new_entry->value == NULL) return NULL;
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new_entry->next = base;
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/* -------------------------------------------------------------------------- */
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/* A small "growing string" implementation to escape malloc/realloc hell */
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pdkim_str *pdkim_strnew (char *cstr) {
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unsigned int len = cstr?strlen(cstr):0;
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pdkim_str *p = malloc(sizeof(pdkim_str));
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if (p == NULL) return NULL;
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memset(p,0,sizeof(pdkim_str));
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p->str = malloc(len+1);
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if (p->str == NULL) {
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p->allocated=(len+1);
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if (cstr) strcpy(p->str,cstr);
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char *pdkim_strncat(pdkim_str *str, char *data, int len) {
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if ((str->allocated - str->len) < (len+1)) {
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/* Extend the buffer */
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int num_frags = ((len+1)/PDKIM_STR_ALLOC_FRAG)+1;
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char *n = realloc(str->str,
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(str->allocated+(num_frags*PDKIM_STR_ALLOC_FRAG)));
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if (n == NULL) return NULL;
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str->allocated += (num_frags*PDKIM_STR_ALLOC_FRAG);
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strncpy(&(str->str[str->len]),data,len);
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str->str[str->len] = '\0';
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char *pdkim_strcat(pdkim_str *str, char *cstr) {
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return pdkim_strncat(str, cstr, strlen(cstr));
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char *pdkim_numcat(pdkim_str *str, unsigned long num) {
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snprintf(minibuf,20,"%lu",num);
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return pdkim_strcat(str,minibuf);
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char *pdkim_strtrim(pdkim_str *str) {
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while ( (*p != '\0') && ((*p == '\t') || (*p == ' ')) ) p++;
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while (*p != '\0') {*q = *p; q++; p++;}
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while ( (q != str->str) && ( (*q == '\0') || (*q == '\t') || (*q == ' ') ) ) {
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str->len = strlen(str->str);
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char *pdkim_strclear(pdkim_str *str) {
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void pdkim_strfree(pdkim_str *str) {
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if (str == NULL) return;
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if (str->str != NULL) free(str->str);
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/* -------------------------------------------------------------------------- */
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void pdkim_free_pubkey(pdkim_pubkey *pub) {
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if (pub->version != NULL) free(pub->version);
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if (pub->granularity != NULL) free(pub->granularity);
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if (pub->hashes != NULL) free(pub->hashes);
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if (pub->keytype != NULL) free(pub->keytype);
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if (pub->srvtype != NULL) free(pub->srvtype);
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if (pub->notes != NULL) free(pub->notes);
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if (pub->key != NULL) free(pub->key);
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/* -------------------------------------------------------------------------- */
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void pdkim_free_sig(pdkim_signature *sig) {
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pdkim_signature *next = (pdkim_signature *)sig->next;
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pdkim_stringlist *e = sig->headers;
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pdkim_stringlist *c = e;
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if (e->value != NULL) free(e->value);
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if (sig->sigdata != NULL) free(sig->sigdata);
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if (sig->bodyhash != NULL) free(sig->bodyhash);
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if (sig->selector != NULL) free(sig->selector);
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if (sig->domain != NULL) free(sig->domain);
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if (sig->identity != NULL) free(sig->identity);
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if (sig->headernames != NULL) free(sig->headernames);
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if (sig->copiedheaders != NULL) free(sig->copiedheaders);
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if (sig->rsa_privkey != NULL) free(sig->rsa_privkey);
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if (sig->sign_headers != NULL) free(sig->sign_headers);
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if (sig->signature_header != NULL) free(sig->signature_header);
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if (sig->sha1_body != NULL) free(sig->sha1_body);
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if (sig->sha2_body != NULL) free(sig->sha2_body);
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if (sig->hnames_check != NULL) free(sig->hnames_check);
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if (sig->pubkey != NULL) pdkim_free_pubkey(sig->pubkey);
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if (next != NULL) pdkim_free_sig(next);
315
/* -------------------------------------------------------------------------- */
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DLLEXPORT void pdkim_free_ctx(pdkim_ctx *ctx) {
318
pdkim_free_sig(ctx->sig);
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pdkim_strfree(ctx->cur_header);
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/* -------------------------------------------------------------------------- */
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/* Matches the name of the passed raw "header" against
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the passed colon-separated "list", starting at entry
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"start". Returns the position of the header name in
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int header_name_match(char *header,
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/* Get header name */
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char *hcolon = strchr(header,':');
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if (hcolon == NULL) return rc; /* This isn't a header */
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hname = malloc((hcolon-header)+1);
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if (hname == NULL) return PDKIM_ERR_OOM;
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memset(hname,0,(hcolon-header)+1);
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strncpy(hname,header,(hcolon-header));
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/* Copy tick-off list locally, so we can punch zeroes into it */
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lcopy = strdup(tick);
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return PDKIM_ERR_OOM;
358
if (strcasecmp(p,hname) == 0) {
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/* Invalidate header name instance in tick-off list */
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if (do_tick) tick[p-lcopy] = '_';
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if (strcasecmp(p,hname) == 0) {
371
/* Invalidate header name instance in tick-off list */
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if (do_tick) tick[p-lcopy] = '_';
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/* -------------------------------------------------------------------------- */
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/* Performs "relaxed" canonicalization of a header. The returned pointer needs
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char *pdkim_relax_header (char *header, int crlf) {
386
int past_field_name = 0;
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char *relaxed = malloc(strlen(header)+3);
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if (relaxed == NULL) return NULL;
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if ( (c == '\r') || (c == '\n') ) {
400
if ( (c == '\t') || (c == ' ') ) {
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c = ' '; /* Turns WSP into SP */
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if ( (!past_field_name) && (c == ':') ) {
410
if (seen_wsp) q--; /* This removes WSP before the colon */
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seen_wsp = 1; /* This removes WSP after the colon */
416
/* Lowercase header name */
417
if (!past_field_name) c = tolower(c);
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if (crlf) strcat(relaxed,"\r\n");
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/* -------------------------------------------------------------------------- */
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#define PDKIM_QP_ERROR_DECODE -1
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char *pdkim_decode_qp_char(char *qp_p, int *c) {
431
char *initial_pos = qp_p;
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/* Advance one char */
436
/* Check for two hex digits and decode them */
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if (isxdigit(*qp_p) && isxdigit(qp_p[1])) {
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/* Do hex conversion */
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if (isdigit(*qp_p)) {*c = *qp_p - '0';}
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else {*c = toupper(*qp_p) - 'A' + 10;}
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if (isdigit(qp_p[1])) {*c |= qp_p[1] - '0';}
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else {*c |= toupper(qp_p[1]) - 'A' + 10;}
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/* Illegal char here */
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*c = PDKIM_QP_ERROR_DECODE;
453
/* -------------------------------------------------------------------------- */
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char *pdkim_decode_qp(char *str) {
458
char *n = malloc(strlen(p)+1);
459
if (n == NULL) return NULL;
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p = pdkim_decode_qp_char(p,&nchar);
482
/* -------------------------------------------------------------------------- */
483
char *pdkim_decode_base64(char *str, int *num_decoded) {
487
base64_decode(NULL, &dlen, (unsigned char *)str, strlen(str));
488
res = malloc(dlen+1);
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if (res == NULL) return NULL;
490
if (base64_decode((unsigned char *)res,&dlen,(unsigned char *)str,strlen(str)) != 0) {
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if (num_decoded != NULL) *num_decoded = dlen;
498
/* -------------------------------------------------------------------------- */
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char *pdkim_encode_base64(char *str, int num) {
503
base64_encode(NULL, &dlen, (unsigned char *)str, num);
504
res = malloc(dlen+1);
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if (res == NULL) return NULL;
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if (base64_encode((unsigned char *)res,&dlen,(unsigned char *)str,num) != 0) {
514
/* -------------------------------------------------------------------------- */
515
#define PDKIM_HDR_LIMBO 0
516
#define PDKIM_HDR_TAG 1
517
#define PDKIM_HDR_VALUE 2
518
pdkim_signature *pdkim_parse_sig_header(pdkim_ctx *ctx, char *raw_hdr) {
519
pdkim_signature *sig ;
521
pdkim_str *cur_tag = NULL;
522
pdkim_str *cur_val = NULL;
525
int where = PDKIM_HDR_LIMBO;
528
sig = malloc(sizeof(pdkim_signature));
529
if (sig == NULL) return NULL;
530
memset(sig,0,sizeof(pdkim_signature));
531
sig->bodylength = -1;
533
sig->rawsig_no_b_val = malloc(strlen(raw_hdr)+1);
534
if (sig->rawsig_no_b_val == NULL) {
540
q = sig->rawsig_no_b_val;
545
if ( (*p == '\r') || (*p == '\n') )
548
/* Fast-forward through header name */
550
if (*p == ':') past_hname = 1;
554
if (where == PDKIM_HDR_LIMBO) {
555
/* In limbo, just wait for a tag-char to appear */
556
if (!((*p >= 'a') && (*p <= 'z')))
559
where = PDKIM_HDR_TAG;
562
if (where == PDKIM_HDR_TAG) {
564
cur_tag = pdkim_strnew(NULL);
566
if ((*p >= 'a') && (*p <= 'z'))
567
pdkim_strncat(cur_tag,p,1);
570
if (strcmp(cur_tag->str,"b") == 0) {
574
where = PDKIM_HDR_VALUE;
579
if (where == PDKIM_HDR_VALUE) {
581
cur_val = pdkim_strnew(NULL);
583
if ( (*p == '\r') || (*p == '\n') || (*p == ' ') || (*p == '\t') )
586
if ( (*p == ';') || (*p == '\0') ) {
587
if (cur_tag->len > 0) {
588
pdkim_strtrim(cur_val);
590
if (ctx->debug_stream)
591
fprintf(ctx->debug_stream, "%s=%s\n", cur_tag->str, cur_val->str);
593
switch (cur_tag->str[0]) {
595
switch (cur_tag->str[1]) {
597
sig->bodyhash = pdkim_decode_base64(cur_val->str,&(sig->bodyhash_len));
600
sig->sigdata = pdkim_decode_base64(cur_val->str,&(sig->sigdata_len));
605
if (strcmp(cur_val->str,PDKIM_SIGNATURE_VERSION) == 0) {
606
/* We only support version 1, and that is currently the
607
only version there is. */
613
while (pdkim_algos[i] != NULL) {
614
if (strcmp(cur_val->str,pdkim_algos[i]) == 0 ) {
623
while (pdkim_combined_canons[i].str != NULL) {
624
if (strcmp(cur_val->str,pdkim_combined_canons[i].str) == 0 ) {
625
sig->canon_headers = pdkim_combined_canons[i].canon_headers;
626
sig->canon_body = pdkim_combined_canons[i].canon_body;
634
while (pdkim_querymethods[i] != NULL) {
635
if (strcmp(cur_val->str,pdkim_querymethods[i]) == 0 ) {
636
sig->querymethod = i;
643
sig->selector = strdup(cur_val->str);
646
sig->domain = strdup(cur_val->str);
649
sig->identity = pdkim_decode_qp(cur_val->str);
652
sig->created = strtoul(cur_val->str,NULL,10);
655
sig->expires = strtoul(cur_val->str,NULL,10);
658
sig->bodylength = strtol(cur_val->str,NULL,10);
661
sig->headernames = strdup(cur_val->str);
664
sig->copiedheaders = pdkim_decode_qp(cur_val->str);
668
if (ctx->debug_stream)
669
fprintf(ctx->debug_stream, "Unknown tag encountered\n");
674
pdkim_strclear(cur_tag);
675
pdkim_strclear(cur_val);
677
where = PDKIM_HDR_LIMBO;
680
else pdkim_strncat(cur_val,p,1);
684
if (*p == '\0') break;
693
/* Make sure the most important bits are there. */
694
if (!(sig->domain && (*(sig->domain) != '\0') &&
695
sig->selector && (*(sig->selector) != '\0') &&
696
sig->headernames && (*(sig->headernames) != '\0') &&
704
/* Copy header list to 'tick-off' header list */
705
sig->hnames_check = strdup(sig->headernames);
708
/* Chomp raw header. The final newline must not be added to the signature. */
710
while( (q > sig->rawsig_no_b_val) && ((*q == '\r') || (*q == '\n')) ) {
715
if (ctx->debug_stream) {
716
fprintf(ctx->debug_stream,
717
"PDKIM >> Raw signature w/o b= tag value >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
718
pdkim_quoteprint(ctx->debug_stream,
719
sig->rawsig_no_b_val,
720
strlen(sig->rawsig_no_b_val), 1);
721
fprintf(ctx->debug_stream,
722
"PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
726
sig->sha1_body = malloc(sizeof(sha1_context));
727
if (sig->sha1_body == NULL) {
731
sig->sha2_body = malloc(sizeof(sha2_context));
732
if (sig->sha2_body == NULL) {
737
sha1_starts(sig->sha1_body);
738
sha2_starts(sig->sha2_body,0);
744
/* -------------------------------------------------------------------------- */
745
pdkim_pubkey *pdkim_parse_pubkey_record(pdkim_ctx *ctx, char *raw_record) {
748
pdkim_str *cur_tag = NULL;
749
pdkim_str *cur_val = NULL;
750
int where = PDKIM_HDR_LIMBO;
752
pub = malloc(sizeof(pdkim_pubkey));
753
if (pub == NULL) return NULL;
754
memset(pub,0,sizeof(pdkim_pubkey));
761
if ( (*p == '\r') || (*p == '\n') )
764
if (where == PDKIM_HDR_LIMBO) {
765
/* In limbo, just wait for a tag-char to appear */
766
if (!((*p >= 'a') && (*p <= 'z')))
769
where = PDKIM_HDR_TAG;
772
if (where == PDKIM_HDR_TAG) {
774
cur_tag = pdkim_strnew(NULL);
776
if ((*p >= 'a') && (*p <= 'z'))
777
pdkim_strncat(cur_tag,p,1);
780
where = PDKIM_HDR_VALUE;
785
if (where == PDKIM_HDR_VALUE) {
787
cur_val = pdkim_strnew(NULL);
789
if ( (*p == '\r') || (*p == '\n') )
792
if ( (*p == ';') || (*p == '\0') ) {
793
if (cur_tag->len > 0) {
794
pdkim_strtrim(cur_val);
796
if (ctx->debug_stream)
797
fprintf(ctx->debug_stream, "%s=%s\n", cur_tag->str, cur_val->str);
799
switch (cur_tag->str[0]) {
801
/* This tag isn't evaluated because:
802
- We only support version DKIM1.
803
- Which is the default for this value (set below)
804
- Other versions are currently not specified. */
807
pub->hashes = strdup(cur_val->str);
810
pub->granularity = strdup(cur_val->str);
813
pub->notes = pdkim_decode_qp(cur_val->str);
816
pub->key = pdkim_decode_base64(cur_val->str,&(pub->key_len));
819
pub->hashes = strdup(cur_val->str);
822
pub->srvtype = strdup(cur_val->str);
825
if (strchr(cur_val->str,'t') != NULL) pub->testing = 1;
826
if (strchr(cur_val->str,'s') != NULL) pub->no_subdomaining = 1;
830
if (ctx->debug_stream)
831
fprintf(ctx->debug_stream, "Unknown tag encountered\n");
836
pdkim_strclear(cur_tag);
837
pdkim_strclear(cur_val);
838
where = PDKIM_HDR_LIMBO;
841
else pdkim_strncat(cur_val,p,1);
845
if (*p == '\0') break;
849
/* Set fallback defaults */
850
if (pub->version == NULL) pub->version = strdup(PDKIM_PUB_RECORD_VERSION);
851
if (pub->granularity == NULL) pub->granularity = strdup("*");
852
if (pub->keytype == NULL) pub->keytype = strdup("rsa");
853
if (pub->srvtype == NULL) pub->srvtype = strdup("*");
856
if (pub->key == NULL) {
857
pdkim_free_pubkey(pub);
865
/* -------------------------------------------------------------------------- */
866
int pdkim_update_bodyhash(pdkim_ctx *ctx, char *data, int len) {
867
pdkim_signature *sig = ctx->sig;
868
/* Cache relaxed version of data */
869
char *relaxed_data = NULL;
872
/* Traverse all signatures, updating their hashes. */
873
while (sig != NULL) {
874
/* Defaults to simple canon (no further treatment necessary) */
875
char *canon_data = data;
878
if (sig->canon_body == PDKIM_CANON_RELAXED) {
879
/* Relax the line if not done already */
880
if (relaxed_data == NULL) {
884
relaxed_data = malloc(len+1);
885
if (relaxed_data == NULL) return PDKIM_ERR_OOM;
889
if ( (q > 0) && (relaxed_data[q-1] == ' ') ) q--;
891
else if ( (c == '\t') || (c == ' ') ) {
892
c = ' '; /* Turns WSP into SP */
900
relaxed_data[q++] = c;
903
relaxed_data[q] = '\0';
906
canon_data = relaxed_data;
907
canon_len = relaxed_len;
910
/* Make sure we don't exceed the to-be-signed body length */
911
if ((sig->bodylength >= 0) &&
912
((sig->signed_body_bytes+(unsigned long)canon_len) > sig->bodylength))
913
canon_len = (sig->bodylength - sig->signed_body_bytes);
916
if (sig->algo == PDKIM_ALGO_RSA_SHA1)
917
sha1_update(sig->sha1_body,(unsigned char *)canon_data,canon_len);
919
sha2_update(sig->sha2_body,(unsigned char *)canon_data,canon_len);
920
sig->signed_body_bytes += canon_len;
922
if (ctx->debug_stream!=NULL)
923
pdkim_quoteprint(ctx->debug_stream,canon_data,canon_len,0);
930
if (relaxed_data != NULL) free(relaxed_data);
935
/* -------------------------------------------------------------------------- */
936
int pdkim_finish_bodyhash(pdkim_ctx *ctx) {
937
pdkim_signature *sig = ctx->sig;
939
/* Traverse all signatures */
940
while (sig != NULL) {
943
unsigned char bh[32]; /* SHA-256 = 32 Bytes, SHA-1 = 20 Bytes */
944
if (sig->algo == PDKIM_ALGO_RSA_SHA1)
945
sha1_finish(sig->sha1_body,bh);
947
sha2_finish(sig->sha2_body,bh);
950
if (ctx->debug_stream) {
951
fprintf(ctx->debug_stream, "PDKIM [%s] Body bytes hashed: %lu\n",
952
sig->domain, sig->signed_body_bytes);
953
fprintf(ctx->debug_stream, "PDKIM [%s] bh computed: ", sig->domain);
954
pdkim_hexprint(ctx->debug_stream, (char *)bh,
955
(sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32,1);
959
/* SIGNING -------------------------------------------------------------- */
960
if (ctx->mode == PDKIM_MODE_SIGN) {
961
sig->bodyhash_len = (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32;
962
sig->bodyhash = malloc(sig->bodyhash_len);
963
if (sig->bodyhash == NULL) return PDKIM_ERR_OOM;
964
memcpy(sig->bodyhash,bh,sig->bodyhash_len);
966
/* If bodylength limit is set, and we have received less bytes
967
than the requested amount, effectively remove the limit tag. */
968
if (sig->signed_body_bytes < sig->bodylength) sig->bodylength = -1;
970
/* VERIFICATION --------------------------------------------------------- */
972
/* Compare bodyhash */
973
if (memcmp(bh,sig->bodyhash,
974
(sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32) == 0) {
976
if (ctx->debug_stream)
977
fprintf(ctx->debug_stream, "PDKIM [%s] Body hash verified OK\n",
983
if (ctx->debug_stream) {
984
fprintf(ctx->debug_stream, "PDKIM [%s] Body hash did NOT verify\n",
986
fprintf(ctx->debug_stream, "PDKIM [%s] bh signature: ", sig->domain);
987
pdkim_hexprint(ctx->debug_stream, sig->bodyhash,
988
(sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32,1);
991
sig->verify_status = PDKIM_VERIFY_FAIL;
992
sig->verify_ext_status = PDKIM_VERIFY_FAIL_BODY;
1004
/* -------------------------------------------------------------------------- */
1005
/* Callback from pdkim_feed below for processing complete body lines */
1006
int pdkim_bodyline_complete(pdkim_ctx *ctx) {
1007
char *p = ctx->linebuf;
1008
int n = ctx->linebuf_offset;
1010
/* Ignore extra data if we've seen the end-of-data marker */
1011
if (ctx->seen_eod) goto BAIL;
1013
/* We've always got one extra byte to stuff a zero ... */
1014
ctx->linebuf[(ctx->linebuf_offset)] = '\0';
1016
if (ctx->input_mode == PDKIM_INPUT_SMTP) {
1017
/* Terminate on EOD marker */
1018
if (memcmp(p,".\r\n",3) == 0) {
1023
if (memcmp(p,"..",2) == 0) {
1029
/* Empty lines need to be buffered until we find a non-empty line */
1030
if (memcmp(p,"\r\n",2) == 0) {
1031
ctx->num_buffered_crlf++;
1035
/* At this point, we have a non-empty line, so release the buffered ones. */
1036
while (ctx->num_buffered_crlf) {
1037
pdkim_update_bodyhash(ctx,"\r\n",2);
1038
ctx->num_buffered_crlf--;
1041
pdkim_update_bodyhash(ctx,p,n);
1044
ctx->linebuf_offset = 0;
1049
/* -------------------------------------------------------------------------- */
1050
/* Callback from pdkim_feed below for processing complete headers */
1051
#define DKIM_SIGNATURE_HEADERNAME "DKIM-Signature:"
1052
int pdkim_header_complete(pdkim_ctx *ctx) {
1053
pdkim_signature *sig = ctx->sig;
1055
/* Special case: The last header can have an extra \r appended */
1056
if ( (ctx->cur_header->len > 1) &&
1057
(ctx->cur_header->str[(ctx->cur_header->len)-1] == '\r') ) {
1058
ctx->cur_header->str[(ctx->cur_header->len)-1] = '\0';
1059
ctx->cur_header->len--;
1063
if (ctx->num_headers > PDKIM_MAX_HEADERS) goto BAIL;
1065
/* Traverse all signatures */
1066
while (sig != NULL) {
1067
pdkim_stringlist *list;
1069
/* SIGNING -------------------------------------------------------------- */
1070
if (ctx->mode == PDKIM_MODE_SIGN) {
1071
if (header_name_match(ctx->cur_header->str,
1074
PDKIM_DEFAULT_SIGN_HEADERS, 0) != PDKIM_OK) goto NEXT_SIG;
1076
/* VERIFICATION --------------------------------------------------------- */
1078
/* Header is not included or all instances were already 'ticked off' */
1079
if (header_name_match(ctx->cur_header->str,
1080
sig->hnames_check, 1) != PDKIM_OK) goto NEXT_SIG;
1083
/* Add header to the signed headers list (in reverse order) */
1084
list = pdkim_prepend_stringlist(sig->headers,
1085
ctx->cur_header->str);
1086
if (list == NULL) return PDKIM_ERR_OOM;
1087
sig->headers = list;
1093
/* DKIM-Signature: headers are added to the verification list */
1094
if ( (ctx->mode == PDKIM_MODE_VERIFY) &&
1095
(strncasecmp(ctx->cur_header->str,
1096
DKIM_SIGNATURE_HEADERNAME,
1097
strlen(DKIM_SIGNATURE_HEADERNAME)) == 0) ) {
1098
pdkim_signature *new_sig;
1099
/* Create and chain new signature block */
1101
if (ctx->debug_stream)
1102
fprintf(ctx->debug_stream,
1103
"PDKIM >> Found sig, trying to parse >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1105
new_sig = pdkim_parse_sig_header(ctx, ctx->cur_header->str);
1106
if (new_sig != NULL) {
1107
pdkim_signature *last_sig = ctx->sig;
1108
if (last_sig == NULL) {
1112
while (last_sig->next != NULL) { last_sig = last_sig->next; }
1113
last_sig->next = new_sig;
1118
if (ctx->debug_stream) {
1119
fprintf(ctx->debug_stream,"Error while parsing signature header\n");
1120
fprintf(ctx->debug_stream,
1121
"PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1128
pdkim_strclear(ctx->cur_header); /* Re-use existing pdkim_str */
1134
/* -------------------------------------------------------------------------- */
1135
#define HEADER_BUFFER_FRAG_SIZE 256
1136
DLLEXPORT int pdkim_feed (pdkim_ctx *ctx,
1140
for (p=0;p<len;p++) {
1142
if (ctx->past_headers) {
1143
/* Processing body byte */
1144
ctx->linebuf[(ctx->linebuf_offset)++] = c;
1146
int rc = pdkim_bodyline_complete(ctx); /* End of line */
1147
if (rc != PDKIM_OK) return rc;
1149
if (ctx->linebuf_offset == (PDKIM_MAX_BODY_LINE_LEN-1))
1150
return PDKIM_ERR_LONG_LINE;
1153
/* Processing header byte */
1157
int rc = pdkim_header_complete(ctx); /* Seen last header line */
1158
if (rc != PDKIM_OK) return rc;
1159
ctx->past_headers = 1;
1162
if (ctx->debug_stream)
1163
fprintf(ctx->debug_stream,
1164
"PDKIM >> Hashed body data, canonicalized >>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1168
else ctx->seen_lf = 1;
1170
else if (ctx->seen_lf) {
1171
if (! ((c == '\t') || (c == ' '))) {
1172
int rc = pdkim_header_complete(ctx); /* End of header */
1173
if (rc != PDKIM_OK) return rc;
1178
if (ctx->cur_header == NULL) {
1179
ctx->cur_header = pdkim_strnew(NULL);
1180
if (ctx->cur_header == NULL) return PDKIM_ERR_OOM;
1182
if (ctx->cur_header->len < PDKIM_MAX_HEADER_LEN)
1183
if (pdkim_strncat(ctx->cur_header,&data[p],1) == NULL)
1184
return PDKIM_ERR_OOM;
1191
/* -------------------------------------------------------------------------- */
1192
char *pdkim_create_header(pdkim_signature *sig, int final) {
1194
char *base64_bh = NULL;
1195
char *base64_b = NULL;
1196
pdkim_str *hdr = pdkim_strnew("DKIM-Signature: v="PDKIM_SIGNATURE_VERSION);
1197
if (hdr == NULL) return NULL;
1199
base64_bh = pdkim_encode_base64(sig->bodyhash, sig->bodyhash_len);
1200
if (base64_bh == NULL) goto BAIL;
1202
/* Required and static bits */
1204
pdkim_strcat(hdr,"; a=") &&
1205
pdkim_strcat(hdr,pdkim_algos[sig->algo]) &&
1206
pdkim_strcat(hdr,"; q=") &&
1207
pdkim_strcat(hdr,pdkim_querymethods[sig->querymethod]) &&
1208
pdkim_strcat(hdr,"; c=") &&
1209
pdkim_strcat(hdr,pdkim_canons[sig->canon_headers]) &&
1210
pdkim_strcat(hdr,"/") &&
1211
pdkim_strcat(hdr,pdkim_canons[sig->canon_body]) &&
1212
pdkim_strcat(hdr,"; d=") &&
1213
pdkim_strcat(hdr,sig->domain) &&
1214
pdkim_strcat(hdr,"; s=") &&
1215
pdkim_strcat(hdr,sig->selector) &&
1216
pdkim_strcat(hdr,";\r\n\th=") &&
1217
pdkim_strcat(hdr,sig->headernames) &&
1218
pdkim_strcat(hdr,"; bh=") &&
1219
pdkim_strcat(hdr,base64_bh) &&
1220
pdkim_strcat(hdr,";\r\n\t")
1223
if (sig->identity != NULL) {
1224
if (!( pdkim_strcat(hdr,"i=") &&
1225
pdkim_strcat(hdr,sig->identity) &&
1226
pdkim_strcat(hdr,";") ) ) {
1230
if (sig->created > 0) {
1231
if (!( pdkim_strcat(hdr,"t=") &&
1232
pdkim_numcat(hdr,sig->created) &&
1233
pdkim_strcat(hdr,";") ) ) {
1237
if (sig->expires > 0) {
1238
if (!( pdkim_strcat(hdr,"x=") &&
1239
pdkim_numcat(hdr,sig->expires) &&
1240
pdkim_strcat(hdr,";") ) ) {
1244
if (sig->bodylength >= 0) {
1245
if (!( pdkim_strcat(hdr,"l=") &&
1246
pdkim_numcat(hdr,sig->bodylength) &&
1247
pdkim_strcat(hdr,";") ) ) {
1251
/* Extra linebreak */
1252
if (hdr->str[(hdr->len)-1] == ';') {
1253
if (!pdkim_strcat(hdr," \r\n\t")) goto BAIL;
1255
/* Preliminary or final version? */
1257
base64_b = pdkim_encode_base64(sig->sigdata, sig->sigdata_len);
1258
if (base64_b == NULL) goto BAIL;
1260
pdkim_strcat(hdr,"b=") &&
1261
pdkim_strcat(hdr,base64_b) &&
1262
pdkim_strcat(hdr,";")
1266
if (pdkim_strcat(hdr,"b=;")) goto DONE;
1273
rc = strdup(hdr->str);
1277
if (base64_bh != NULL) free(base64_bh);
1278
if (base64_b != NULL) free(base64_b);
1283
/* -------------------------------------------------------------------------- */
1284
DLLEXPORT int pdkim_feed_finish(pdkim_ctx *ctx, pdkim_signature **return_signatures) {
1285
pdkim_signature *sig = ctx->sig;
1286
pdkim_str *headernames = NULL; /* Collected signed header names */
1288
/* Check if we must still flush a (partial) header. If that is the
1289
case, the message has no body, and we must compute a body hash
1290
out of '<CR><LF>' */
1291
if (ctx->cur_header && ctx->cur_header->len) {
1292
int rc = pdkim_header_complete(ctx);
1293
if (rc != PDKIM_OK) return rc;
1294
pdkim_update_bodyhash(ctx,"\r\n",2);
1297
/* For non-smtp input, check if there's an unfinished line in the
1298
body line buffer. If that is the case, we must add a CRLF to the
1299
hash to properly terminate the message. */
1300
if ((ctx->input_mode == PDKIM_INPUT_NORMAL) && ctx->linebuf_offset) {
1301
pdkim_update_bodyhash(ctx, ctx->linebuf, ctx->linebuf_offset);
1302
pdkim_update_bodyhash(ctx,"\r\n",2);
1305
if (ctx->debug_stream)
1306
fprintf(ctx->debug_stream,
1307
"PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1311
/* Build (and/or evaluate) body hash */
1312
if (pdkim_finish_bodyhash(ctx) != PDKIM_OK) return PDKIM_ERR_OOM;
1314
/* SIGNING -------------------------------------------------------------- */
1315
if (ctx->mode == PDKIM_MODE_SIGN) {
1316
headernames = pdkim_strnew(NULL);
1317
if (headernames == NULL) return PDKIM_ERR_OOM;
1319
/* ---------------------------------------------------------------------- */
1321
while (sig != NULL) {
1322
sha1_context sha1_headers;
1323
sha2_context sha2_headers;
1325
char headerhash[32];
1327
if (sig->algo == PDKIM_ALGO_RSA_SHA1)
1328
sha1_starts(&sha1_headers);
1330
sha2_starts(&sha2_headers,0);
1333
if (ctx->debug_stream)
1334
fprintf(ctx->debug_stream,
1335
"PDKIM >> Hashed header data, canonicalized, in sequence >>>>>>>>>>>>>>\n");
1338
/* SIGNING ---------------------------------------------------------------- */
1339
/* When signing, walk through our header list and add them to the hash. As we
1340
go, construct a list of the header's names to use for the h= parameter. */
1341
if (ctx->mode == PDKIM_MODE_SIGN) {
1342
pdkim_stringlist *p = sig->headers;
1345
/* Collect header names (Note: colon presence is guaranteed here) */
1346
char *q = strchr(p->value,':');
1347
if (pdkim_strncat(headernames, p->value,
1348
(q-(p->value))+((p->next==NULL)?0:1)) == NULL)
1349
return PDKIM_ERR_OOM;
1351
if (sig->canon_headers == PDKIM_CANON_RELAXED)
1352
rh = pdkim_relax_header(p->value,1); /* cook header for relaxed canon */
1354
rh = strdup(p->value); /* just copy it for simple canon */
1356
if (rh == NULL) return PDKIM_ERR_OOM;
1358
/* Feed header to the hash algorithm */
1359
if (sig->algo == PDKIM_ALGO_RSA_SHA1)
1360
sha1_update(&(sha1_headers),(unsigned char *)rh,strlen(rh));
1362
sha2_update(&(sha2_headers),(unsigned char *)rh,strlen(rh));
1364
if (ctx->debug_stream)
1365
pdkim_quoteprint(ctx->debug_stream, rh, strlen(rh), 1);
1371
/* VERIFICATION ----------------------------------------------------------- */
1372
/* When verifying, walk through the header name list in the h= parameter and
1373
add the headers to the hash in that order. */
1375
char *b = strdup(sig->headernames);
1378
if (b == NULL) return PDKIM_ERR_OOM;
1381
pdkim_stringlist *hdrs = sig->headers;
1383
if (q != NULL) *q = '\0';
1384
while (hdrs != NULL) {
1385
if ( (strncasecmp(hdrs->value,p,strlen(p)) == 0) &&
1386
((hdrs->value)[strlen(p)] == ':') ) {
1388
if (sig->canon_headers == PDKIM_CANON_RELAXED)
1389
rh = pdkim_relax_header(hdrs->value,1); /* cook header for relaxed canon */
1391
rh = strdup(hdrs->value); /* just copy it for simple canon */
1392
if (rh == NULL) return PDKIM_ERR_OOM;
1393
/* Feed header to the hash algorithm */
1394
if (sig->algo == PDKIM_ALGO_RSA_SHA1)
1395
sha1_update(&(sha1_headers),(unsigned char *)rh,strlen(rh));
1397
sha2_update(&(sha2_headers),(unsigned char *)rh,strlen(rh));
1399
if (ctx->debug_stream)
1400
pdkim_quoteprint(ctx->debug_stream, rh, strlen(rh), 1);
1403
(hdrs->value)[0] = '_';
1408
if (q == NULL) break;
1415
if (ctx->debug_stream)
1416
fprintf(ctx->debug_stream,
1417
"PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1420
/* SIGNING ---------------------------------------------------------------- */
1421
if (ctx->mode == PDKIM_MODE_SIGN) {
1422
/* Copy headernames to signature struct */
1423
sig->headernames = strdup(headernames->str);
1424
pdkim_strfree(headernames);
1426
/* Create signature header with b= omitted */
1427
sig_hdr = pdkim_create_header(ctx->sig,0);
1429
/* VERIFICATION ----------------------------------------------------------- */
1431
sig_hdr = strdup(sig->rawsig_no_b_val);
1433
/* ------------------------------------------------------------------------ */
1435
if (sig_hdr == NULL) return PDKIM_ERR_OOM;
1437
/* Relax header if necessary */
1438
if (sig->canon_headers == PDKIM_CANON_RELAXED) {
1439
char *relaxed_hdr = pdkim_relax_header(sig_hdr,0);
1441
if (relaxed_hdr == NULL) return PDKIM_ERR_OOM;
1442
sig_hdr = relaxed_hdr;
1446
if (ctx->debug_stream) {
1447
fprintf(ctx->debug_stream,
1448
"PDKIM >> Signed DKIM-Signature header, canonicalized >>>>>>>>>>>>>>>>>\n");
1449
pdkim_quoteprint(ctx->debug_stream, sig_hdr, strlen(sig_hdr), 1);
1450
fprintf(ctx->debug_stream,
1451
"PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1455
/* Finalize header hash */
1456
if (sig->algo == PDKIM_ALGO_RSA_SHA1) {
1457
sha1_update(&(sha1_headers),(unsigned char *)sig_hdr,strlen(sig_hdr));
1458
sha1_finish(&(sha1_headers),(unsigned char *)headerhash);
1460
if (ctx->debug_stream) {
1461
fprintf(ctx->debug_stream, "PDKIM [%s] hh computed: ", sig->domain);
1462
pdkim_hexprint(ctx->debug_stream, headerhash, 20, 1);
1467
sha2_update(&(sha2_headers),(unsigned char *)sig_hdr,strlen(sig_hdr));
1468
sha2_finish(&(sha2_headers),(unsigned char *)headerhash);
1470
if (ctx->debug_stream) {
1471
fprintf(ctx->debug_stream, "PDKIM [%s] hh computed: ", sig->domain);
1472
pdkim_hexprint(ctx->debug_stream, headerhash, 32, 1);
1479
/* SIGNING ---------------------------------------------------------------- */
1480
if (ctx->mode == PDKIM_MODE_SIGN) {
1483
rsa_init(&rsa,RSA_PKCS_V15,0,NULL,NULL);
1485
/* Perform private key operation */
1486
if (rsa_parse_key(&rsa, (unsigned char *)sig->rsa_privkey,
1487
strlen(sig->rsa_privkey), NULL, 0) != 0) {
1488
return PDKIM_ERR_RSA_PRIVKEY;
1491
sig->sigdata_len = mpi_size(&(rsa.N));
1492
sig->sigdata = malloc(sig->sigdata_len);
1493
if (sig->sigdata == NULL) return PDKIM_ERR_OOM;
1495
if (rsa_pkcs1_sign( &rsa, RSA_PRIVATE,
1496
((sig->algo == PDKIM_ALGO_RSA_SHA1)?
1497
RSA_SHA1:RSA_SHA256),
1499
(unsigned char *)headerhash,
1500
(unsigned char *)sig->sigdata ) != 0) {
1501
return PDKIM_ERR_RSA_SIGNING;
1507
if (ctx->debug_stream) {
1508
fprintf(ctx->debug_stream, "PDKIM [%s] b computed: ",
1510
pdkim_hexprint(ctx->debug_stream, sig->sigdata, sig->sigdata_len, 1);
1514
sig->signature_header = pdkim_create_header(ctx->sig,1);
1515
if (sig->signature_header == NULL) return PDKIM_ERR_OOM;
1517
/* VERIFICATION ----------------------------------------------------------- */
1520
char *dns_txt_name, *dns_txt_reply;
1522
rsa_init(&rsa,RSA_PKCS_V15,0,NULL,NULL);
1524
dns_txt_name = malloc(PDKIM_DNS_TXT_MAX_NAMELEN);
1525
if (dns_txt_name == NULL) return PDKIM_ERR_OOM;
1526
dns_txt_reply = malloc(PDKIM_DNS_TXT_MAX_RECLEN);
1527
if (dns_txt_reply == NULL) {
1529
return PDKIM_ERR_OOM;
1531
memset(dns_txt_reply,0,PDKIM_DNS_TXT_MAX_RECLEN);
1532
memset(dns_txt_name ,0,PDKIM_DNS_TXT_MAX_NAMELEN);
1534
if (snprintf(dns_txt_name,PDKIM_DNS_TXT_MAX_NAMELEN,
1535
"%s._domainkey.%s.",
1536
sig->selector,sig->domain) >= PDKIM_DNS_TXT_MAX_NAMELEN) {
1537
sig->verify_status = PDKIM_VERIFY_INVALID;
1538
sig->verify_ext_status = PDKIM_VERIFY_INVALID_BUFFER_SIZE;
1542
if ((ctx->dns_txt_callback(dns_txt_name, dns_txt_reply) != PDKIM_OK) ||
1543
(dns_txt_reply[0] == '\0')) {
1544
sig->verify_status = PDKIM_VERIFY_INVALID;
1545
sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE;
1550
if (ctx->debug_stream) {
1551
fprintf(ctx->debug_stream,
1552
"PDKIM >> Parsing public key record >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1553
fprintf(ctx->debug_stream,"Raw record: ");
1554
pdkim_quoteprint(ctx->debug_stream, dns_txt_reply, strlen(dns_txt_reply), 1);
1558
sig->pubkey = pdkim_parse_pubkey_record(ctx,dns_txt_reply);
1559
if (sig->pubkey == NULL) {
1560
sig->verify_status = PDKIM_VERIFY_INVALID;
1561
sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_PARSING;
1563
if (ctx->debug_stream) {
1564
fprintf(ctx->debug_stream,"Error while parsing public key record\n");
1565
fprintf(ctx->debug_stream,
1566
"PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1573
if (ctx->debug_stream) {
1574
fprintf(ctx->debug_stream,
1575
"PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
1579
if (rsa_parse_public_key(&rsa,
1580
(unsigned char *)sig->pubkey->key,
1581
sig->pubkey->key_len) != 0) {
1582
sig->verify_status = PDKIM_VERIFY_INVALID;
1583
sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_PARSING;
1587
/* Check the signature */
1588
if (rsa_pkcs1_verify(&rsa,
1590
((sig->algo == PDKIM_ALGO_RSA_SHA1)?
1591
RSA_SHA1:RSA_SHA256),
1593
(unsigned char *)headerhash,
1594
(unsigned char *)sig->sigdata) != 0) {
1595
sig->verify_status = PDKIM_VERIFY_FAIL;
1596
sig->verify_ext_status = PDKIM_VERIFY_FAIL_MESSAGE;
1600
/* We have a winner! (if bodydhash was correct earlier) */
1601
if (sig->verify_status == PDKIM_VERIFY_NONE) {
1602
sig->verify_status = PDKIM_VERIFY_PASS;
1608
if (ctx->debug_stream) {
1609
fprintf(ctx->debug_stream, "PDKIM [%s] signature status: %s",
1610
sig->domain, pdkim_verify_status_str(sig->verify_status));
1611
if (sig->verify_ext_status > 0) {
1612
fprintf(ctx->debug_stream, " (%s)\n",
1613
pdkim_verify_ext_status_str(sig->verify_ext_status));
1616
fprintf(ctx->debug_stream, "\n");
1623
free(dns_txt_reply);
1629
/* If requested, set return pointer to signature(s) */
1630
if (return_signatures != NULL) {
1631
*return_signatures = ctx->sig;
1638
/* -------------------------------------------------------------------------- */
1639
DLLEXPORT pdkim_ctx *pdkim_init_verify(int input_mode,
1640
int(*dns_txt_callback)(char *, char *)
1642
pdkim_ctx *ctx = malloc(sizeof(pdkim_ctx));
1643
if (ctx == NULL) return NULL;
1644
memset(ctx,0,sizeof(pdkim_ctx));
1646
ctx->linebuf = malloc(PDKIM_MAX_BODY_LINE_LEN);
1647
if (ctx->linebuf == NULL) {
1652
ctx->mode = PDKIM_MODE_VERIFY;
1653
ctx->input_mode = input_mode;
1654
ctx->dns_txt_callback = dns_txt_callback;
1660
/* -------------------------------------------------------------------------- */
1661
DLLEXPORT pdkim_ctx *pdkim_init_sign(int input_mode,
1664
char *rsa_privkey) {
1666
pdkim_signature *sig;
1668
if (!domain || !selector || !rsa_privkey) return NULL;
1670
ctx = malloc(sizeof(pdkim_ctx));
1671
if (ctx == NULL) return NULL;
1672
memset(ctx,0,sizeof(pdkim_ctx));
1674
ctx->linebuf = malloc(PDKIM_MAX_BODY_LINE_LEN);
1675
if (ctx->linebuf == NULL) {
1680
sig = malloc(sizeof(pdkim_signature));
1686
memset(sig,0,sizeof(pdkim_signature));
1687
sig->bodylength = -1;
1689
ctx->mode = PDKIM_MODE_SIGN;
1690
ctx->input_mode = input_mode;
1693
ctx->sig->domain = strdup(domain);
1694
ctx->sig->selector = strdup(selector);
1695
ctx->sig->rsa_privkey = strdup(rsa_privkey);
1697
if (!ctx->sig->domain || !ctx->sig->selector || !ctx->sig->rsa_privkey) {
1698
pdkim_free_ctx(ctx);
1702
ctx->sig->sha1_body = malloc(sizeof(sha1_context));
1703
if (ctx->sig->sha1_body == NULL) {
1704
pdkim_free_ctx(ctx);
1707
sha1_starts(ctx->sig->sha1_body);
1709
ctx->sig->sha2_body = malloc(sizeof(sha2_context));
1710
if (ctx->sig->sha2_body == NULL) {
1711
pdkim_free_ctx(ctx);
1714
sha2_starts(ctx->sig->sha2_body,0);
1720
/* -------------------------------------------------------------------------- */
1721
DLLEXPORT void pdkim_set_debug_stream(pdkim_ctx *ctx,
1722
FILE *debug_stream) {
1723
ctx->debug_stream = debug_stream;
1727
/* -------------------------------------------------------------------------- */
1728
DLLEXPORT int pdkim_set_optional(pdkim_ctx *ctx,
1735
unsigned long created,
1736
unsigned long expires) {
1738
if (identity != NULL) {
1739
ctx->sig->identity = strdup(identity);
1740
if (ctx->sig->identity == NULL) return PDKIM_ERR_OOM;
1743
if (sign_headers != NULL) {
1744
ctx->sig->sign_headers = strdup(sign_headers);
1745
if (ctx->sig->sign_headers == NULL) return PDKIM_ERR_OOM;
1748
ctx->sig->canon_headers = canon_headers;
1749
ctx->sig->canon_body = canon_body;
1750
ctx->sig->bodylength = bodylength;
1751
ctx->sig->algo = algo;
1752
ctx->sig->created = created;
1753
ctx->sig->expires = expires;