forked from osmocom/wireshark
![Bill Meier](/assets/img/avatar_default.png)
Change-Id: I36b2731d67f9345d2fd0c23800bba7d2be94c387 Reviewed-on: https://code.wireshark.org/review/6008 Reviewed-by: Bill Meier <wmeier@newsguy.com>
182 lines
5.4 KiB
C
182 lines
5.4 KiB
C
/* packet-cms.c
|
|
* Routines for RFC5652 Cryptographic Message Syntax packet dissection
|
|
* Ronnie Sahlberg 2004
|
|
* Stig Bjorlykke 2010
|
|
*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.org>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <epan/packet.h>
|
|
#include <epan/oids.h>
|
|
#include <epan/asn1.h>
|
|
#include <wsutil/sha1.h>
|
|
#include <wsutil/md5.h>
|
|
|
|
#include "packet-ber.h"
|
|
#include "packet-cms.h"
|
|
#include "packet-x509af.h"
|
|
#include "packet-x509ce.h"
|
|
#include "packet-x509if.h"
|
|
#include "packet-x509sat.h"
|
|
#include "packet-pkcs12.h"
|
|
|
|
#define PNAME "Cryptographic Message Syntax"
|
|
#define PSNAME "CMS"
|
|
#define PFNAME "cms"
|
|
|
|
void proto_register_cms(void);
|
|
void proto_reg_handoff_cms(void);
|
|
|
|
/* Initialize the protocol and registered fields */
|
|
static int proto_cms = -1;
|
|
static int hf_cms_ci_contentType = -1;
|
|
#include "packet-cms-hf.c"
|
|
|
|
/* Initialize the subtree pointers */
|
|
#include "packet-cms-ett.c"
|
|
|
|
static int dissect_cms_OCTET_STRING(gboolean implicit_tag _U_, tvbuff_t *tvb, int offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_) ; /* XXX kill a compiler warning until asn2wrs stops generating these silly wrappers */
|
|
|
|
|
|
static const char *object_identifier_id;
|
|
static tvbuff_t *content_tvb = NULL;
|
|
|
|
static proto_tree *top_tree=NULL;
|
|
static proto_tree *cap_tree=NULL;
|
|
|
|
#define HASH_SHA1 "1.3.14.3.2.26"
|
|
#define SHA1_BUFFER_SIZE 20
|
|
|
|
#define HASH_MD5 "1.2.840.113549.2.5"
|
|
#define MD5_BUFFER_SIZE 16
|
|
|
|
|
|
/* SHA-2 variants */
|
|
#define HASH_SHA224 "2.16.840.1.101.3.4.2.4"
|
|
#define SHA224_BUFFER_SIZE 32 /* actually 28 */
|
|
#define HASH_SHA256 "2.16.840.1.101.3.4.2.1"
|
|
#define SHA256_BUFFER_SIZE 32
|
|
|
|
unsigned char digest_buf[MAX(SHA1_BUFFER_SIZE, MD5_BUFFER_SIZE)];
|
|
|
|
static void
|
|
cms_verify_msg_digest(proto_item *pi, tvbuff_t *content, const char *alg, tvbuff_t *tvb, int offset)
|
|
{
|
|
sha1_context sha1_ctx;
|
|
md5_state_t md5_ctx;
|
|
int i= 0, buffer_size = 0;
|
|
|
|
/* we only support two algorithms at the moment - if we do add SHA2
|
|
we should add a registration process to use a registration process */
|
|
|
|
if(strcmp(alg, HASH_SHA1) == 0) {
|
|
|
|
sha1_starts(&sha1_ctx);
|
|
|
|
sha1_update(&sha1_ctx, tvb_get_ptr(content, 0, tvb_captured_length(content)),
|
|
tvb_captured_length(content));
|
|
|
|
sha1_finish(&sha1_ctx, digest_buf);
|
|
|
|
buffer_size = SHA1_BUFFER_SIZE;
|
|
|
|
} else if(strcmp(alg, HASH_MD5) == 0) {
|
|
|
|
md5_init(&md5_ctx);
|
|
|
|
md5_append(&md5_ctx, tvb_get_ptr(content, 0, tvb_captured_length(content)),
|
|
tvb_captured_length(content));
|
|
|
|
md5_finish(&md5_ctx, digest_buf);
|
|
|
|
buffer_size = MD5_BUFFER_SIZE;
|
|
}
|
|
|
|
if(buffer_size) {
|
|
/* compare our computed hash with what we have received */
|
|
|
|
if(tvb_bytes_exist(tvb, offset, buffer_size) &&
|
|
(tvb_memeql(tvb, offset, digest_buf, buffer_size) != 0)) {
|
|
proto_item_append_text(pi, " [incorrect, should be ");
|
|
for(i = 0; i < buffer_size; i++)
|
|
proto_item_append_text(pi, "%02X", digest_buf[i]);
|
|
|
|
proto_item_append_text(pi, "]");
|
|
}
|
|
else
|
|
proto_item_append_text(pi, " [correct]");
|
|
} else {
|
|
proto_item_append_text(pi, " [unable to verify]");
|
|
}
|
|
|
|
}
|
|
|
|
#include "packet-cms-fn.c"
|
|
|
|
/*--- proto_register_cms ----------------------------------------------*/
|
|
void proto_register_cms(void) {
|
|
|
|
/* List of fields */
|
|
static hf_register_info hf[] = {
|
|
{ &hf_cms_ci_contentType,
|
|
{ "contentType", "cms.contentInfo.contentType",
|
|
FT_OID, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }},
|
|
#include "packet-cms-hfarr.c"
|
|
};
|
|
|
|
/* List of subtrees */
|
|
static gint *ett[] = {
|
|
#include "packet-cms-ettarr.c"
|
|
};
|
|
|
|
/* Register protocol */
|
|
proto_cms = proto_register_protocol(PNAME, PSNAME, PFNAME);
|
|
|
|
/* Register fields and subtrees */
|
|
proto_register_field_array(proto_cms, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
new_register_ber_syntax_dissector("ContentInfo", proto_cms, dissect_ContentInfo_PDU);
|
|
new_register_ber_syntax_dissector("SignedData", proto_cms, dissect_SignedData_PDU);
|
|
register_ber_oid_syntax(".p7s", NULL, "ContentInfo");
|
|
register_ber_oid_syntax(".p7m", NULL, "ContentInfo");
|
|
register_ber_oid_syntax(".p7c", NULL, "ContentInfo");
|
|
|
|
|
|
}
|
|
|
|
|
|
/*--- proto_reg_handoff_cms -------------------------------------------*/
|
|
void proto_reg_handoff_cms(void) {
|
|
dissector_handle_t content_info_handle;
|
|
#include "packet-cms-dis-tab.c"
|
|
|
|
oid_add_from_string("id-data","1.2.840.113549.1.7.1");
|
|
oid_add_from_string("id-alg-des-ede3-cbc","1.2.840.113549.3.7");
|
|
oid_add_from_string("id-alg-des-cbc","1.3.14.3.2.7");
|
|
|
|
content_info_handle = new_create_dissector_handle (dissect_ContentInfo_PDU, proto_cms);
|
|
dissector_add_string("media_type", "application/pkcs7-mime", content_info_handle);
|
|
dissector_add_string("media_type", "application/pkcs7-signature", content_info_handle);
|
|
}
|
|
|