forked from osmocom/wireshark
166 lines
4.5 KiB
C
166 lines
4.5 KiB
C
/* packet-cms.c
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* Routines for RFC2630 Cryptographic Message Syntax packet dissection
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* Ronnie Sahlberg 2004
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/conversation.h>
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#include <stdio.h>
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#include <string.h>
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#include "packet-ber.h"
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#include "packet-cms.h"
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#include "packet-x509af.h"
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#include "packet-x509if.h"
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#include <epan/sha1.h>
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#include <epan/crypt-md5.h>
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#define PNAME "Cryptographic Message Syntax"
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#define PSNAME "CMS"
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#define PFNAME "cms"
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/* Initialize the protocol and registered fields */
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int proto_cms = -1;
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static int hf_cms_ci_contentType = -1;
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#include "packet-cms-hf.c"
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/* Initialize the subtree pointers */
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#include "packet-cms-ett.c"
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static int dissect_cms_OCTET_STRING(gboolean implicit_tag _U_, tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree, int hf_index _U_) ; /* XXX kill a compiler warning until asn2eth stops generating these silly wrappers */
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static const char *object_identifier_id;
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static tvbuff_t *content_tvb = NULL;
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static proto_tree *top_tree=NULL;
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#define HASH_SHA1 "1.3.14.3.2.26"
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#define SHA1_BUFFER_SIZE 20
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#define HASH_MD5 "1.2.840.113549.2.5"
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#define MD5_BUFFER_SIZE 16
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/* SHA-2 variants */
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#define HASH_SHA224 "2.16.840.1.101.3.4.2.4"
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#define SHA224_BUFFER_SIZE 32 /* actually 28 */
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#define HASH_SHA256 "2.16.840.1.101.3.4.2.1"
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#define SHA256_BUFFER_SIZE 32
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unsigned char digest_buf[MAX(SHA1_BUFFER_SIZE, MD5_BUFFER_SIZE)];
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static void
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cms_verify_msg_digest(proto_item *pi, tvbuff_t *content, const char *alg, tvbuff_t *tvb, int offset)
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{
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sha1_context sha1_ctx;
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md5_state_t md5_ctx;
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int i= 0, buffer_size = 0;
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/* we only support two algorithms at the moment - if we do add SHA2
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we should add a registration process to use a registration process */
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if(strcmp(alg, HASH_SHA1) == 0) {
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sha1_starts(&sha1_ctx);
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sha1_update(&sha1_ctx, tvb_get_ptr(content, 0, tvb_length(content)),
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tvb_length(content));
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sha1_finish(&sha1_ctx, digest_buf);
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buffer_size = SHA1_BUFFER_SIZE;
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} else if(strcmp(alg, HASH_MD5) == 0) {
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md5_init(&md5_ctx);
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md5_append(&md5_ctx, tvb_get_ptr(content, 0, tvb_length(content)),
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tvb_length(content));
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md5_finish(&md5_ctx, digest_buf);
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buffer_size = MD5_BUFFER_SIZE;
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}
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if(buffer_size) {
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/* compare our computed hash with what we have received */
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if(tvb_bytes_exist(tvb, offset, buffer_size) &&
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(memcmp(tvb_get_ptr(tvb, offset, buffer_size), digest_buf, buffer_size) != 0)) {
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proto_item_append_text(pi, " [incorrect, should be ");
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for(i = 0; i < buffer_size; i++)
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proto_item_append_text(pi, "%02X", digest_buf[i]);
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proto_item_append_text(pi, "]");
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}
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else
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proto_item_append_text(pi, " [correct]");
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} else {
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proto_item_append_text(pi, " [unable to verify]");
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}
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}
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#include "packet-cms-fn.c"
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/*--- proto_register_cms ----------------------------------------------*/
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void proto_register_cms(void) {
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/* List of fields */
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static hf_register_info hf[] = {
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{ &hf_cms_ci_contentType,
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{ "contentType", "cms.contentInfo.contentType",
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FT_OID, BASE_NONE, NULL, 0,
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"ContentType", HFILL }},
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#include "packet-cms-hfarr.c"
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};
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/* List of subtrees */
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static gint *ett[] = {
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#include "packet-cms-ettarr.c"
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};
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/* Register protocol */
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proto_cms = proto_register_protocol(PNAME, PSNAME, PFNAME);
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/* Register fields and subtrees */
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proto_register_field_array(proto_cms, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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/*--- proto_reg_handoff_cms -------------------------------------------*/
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void proto_reg_handoff_cms(void) {
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#include "packet-cms-dis-tab.c"
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}
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