forked from osmocom/wireshark
318 lines
8.5 KiB
C
318 lines
8.5 KiB
C
/* packet-cmp.c
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* Routines for RFC2510 Certificate Management Protocol 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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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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-cmp.h"
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#include "packet-crmf.h"
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#include "packet-pkix1explicit.h"
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#include "packet-pkix1implicit.h"
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#include "packet-tcp.h"
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#include <epan/prefs.h>
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#include <epan/nstime.h>
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#define PNAME "Certificate Management Protocol"
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#define PSNAME "CMP"
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#define PFNAME "cmp"
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#define TCP_PORT_CMP 829
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/* desegmentation of CMP over TCP */
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static gboolean cmp_desegment = TRUE;
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/* Initialize the protocol and registered fields */
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int proto_cmp = -1;
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static int hf_cmp_type_oid = -1;
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static int hf_cmp_rm = -1;
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static int hf_cmp_type = -1;
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static int hf_cmp_poll_ref = -1;
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static int hf_cmp_next_poll_ref = -1;
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static int hf_cmp_ttcb = -1;
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#include "packet-cmp-hf.c"
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/* Initialize the subtree pointers */
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static gint ett_cmp = -1;
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#include "packet-cmp-ett.c"
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static const char *object_identifier_id;
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#include "packet-cmp-fn.c"
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static int
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dissect_cmp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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return dissect_cmp_PKIMessage(FALSE, tvb, 0, pinfo, tree, -1);
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}
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#define CMP_TYPE_PKIMSG 0
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#define CMP_TYPE_POLLREP 1
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#define CMP_TYPE_POLLREQ 2
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#define CMP_TYPE_NEGPOLLREP 3
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#define CMP_TYPE_PARTIALMSGREP 4
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#define CMP_TYPE_FINALMSGREP 5
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#define CMP_TYPE_ERRORMSGREP 6
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static const value_string cmp_pdu_types[] = {
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{ CMP_TYPE_PKIMSG, "pkiMsg" },
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{ CMP_TYPE_POLLREP, "pollRep" },
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{ CMP_TYPE_POLLREQ, "pollReq" },
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{ CMP_TYPE_NEGPOLLREP, "negPollRep" },
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{ CMP_TYPE_PARTIALMSGREP, "partialMsgRep" },
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{ CMP_TYPE_FINALMSGREP, "finalMsgRep" },
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{ CMP_TYPE_ERRORMSGREP, "errorMsgRep" },
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{ 0, NULL },
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};
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static void dissect_cmp_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
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{
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tvbuff_t *next_tvb;
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guint32 pdu_len;
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guint8 pdu_type;
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nstime_t ts;
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proto_item *item=NULL;
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proto_tree *tree=NULL;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CMP");
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_clear(pinfo->cinfo, COL_INFO);
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col_add_fstr(pinfo->cinfo, COL_INFO, "PKIXCMP");
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}
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if(parent_tree){
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item=proto_tree_add_item(parent_tree, proto_cmp, tvb, 0, -1, FALSE);
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tree = proto_item_add_subtree(item, ett_cmp);
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}
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pdu_len=tvb_get_ntohl(tvb, 0);
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pdu_type=tvb_get_guint8(tvb, 4);
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proto_tree_add_uint(tree, hf_cmp_rm, tvb, 0, 4, pdu_len);
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proto_tree_add_uint(tree, hf_cmp_type, tvb, 4, 1, pdu_type);
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if (check_col (pinfo->cinfo, COL_INFO)) {
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col_set_str (pinfo->cinfo, COL_INFO, val_to_str (pdu_type, cmp_pdu_types, "0x%x"));
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}
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switch(pdu_type){
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case CMP_TYPE_PKIMSG:
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next_tvb = tvb_new_subset(tvb, 5, tvb_length_remaining(tvb, 5), pdu_len);
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dissect_cmp_pdu(next_tvb, pinfo, tree);
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break;
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case CMP_TYPE_POLLREP:
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proto_tree_add_item(tree, hf_cmp_poll_ref, tvb, 0, 4, FALSE);
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ts.secs = tvb_get_ntohl(tvb, 4);
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ts.nsecs = 0;
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proto_tree_add_time(tree, hf_cmp_ttcb, tvb, 4, 4, &ts);
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break;
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case CMP_TYPE_POLLREQ:
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proto_tree_add_item(tree, hf_cmp_poll_ref, tvb, 0, 4, FALSE);
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break;
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case CMP_TYPE_NEGPOLLREP:
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break;
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case CMP_TYPE_PARTIALMSGREP:
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proto_tree_add_item(tree, hf_cmp_next_poll_ref, tvb, 0, 4, FALSE);
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ts.secs = tvb_get_ntohl(tvb, 4);
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ts.nsecs = 0;
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proto_tree_add_time(tree, hf_cmp_ttcb, tvb, 4, 4, &ts);
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next_tvb = tvb_new_subset(tvb, 13, tvb_length_remaining(tvb, 13), pdu_len);
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dissect_cmp_pdu(next_tvb, pinfo, tree);
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break;
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case CMP_TYPE_FINALMSGREP:
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next_tvb = tvb_new_subset(tvb, 5, tvb_length_remaining(tvb, 5), pdu_len);
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dissect_cmp_pdu(next_tvb, pinfo, tree);
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break;
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case CMP_TYPE_ERRORMSGREP:
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/*XXX to be added*/
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break;
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}
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}
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static guint get_cmp_pdu_len(tvbuff_t *tvb, int offset)
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{
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guint32 plen;
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/*
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* Get the length of the CMP-over-TCP packet.
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*/
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plen = tvb_get_ntohl(tvb, offset);
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return plen+4;
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}
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/* CMP over TCP RFC2510 section 5.2 */
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static int
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dissect_cmp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
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{
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guint32 pdu_len;
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guint8 pdu_type;
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/* only attempt to dissect it as CMP over TCP if we have
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* at least 5 bytes.
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*/
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if (!tvb_bytes_exist(tvb, 0, 5)) {
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return 0;
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}
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pdu_len=tvb_get_ntohl(tvb, 0);
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pdu_type=tvb_get_guint8(tvb, 4);
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/* arbitrary limit: assume a CMP over TCP pdu is never >10000 bytes
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* in size.
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* It is definitely at least 1 byte to accomodate the flags byte
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*/
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if((pdu_len<=0)||(pdu_len>10000)){
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return 0;
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}
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/* type is between 0 and 6 */
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if(pdu_type>6){
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return 0;
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}
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/* type 0 contains a PKI message and must therefore be >= 3 bytes
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* long (flags + BER TAG + BER LENGTH
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*/
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if((pdu_type==0)&&(pdu_len<3)){
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return 0;
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}
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tcp_dissect_pdus(tvb, pinfo, parent_tree, cmp_desegment, 4, get_cmp_pdu_len,
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dissect_cmp_tcp_pdu);
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return tvb_length(tvb);
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}
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static int
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dissect_cmp_http(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
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{
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proto_item *item=NULL;
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proto_tree *tree=NULL;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CMP");
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_clear(pinfo->cinfo, COL_INFO);
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col_add_fstr(pinfo->cinfo, COL_INFO, "PKIXCMP");
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}
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if(parent_tree){
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item=proto_tree_add_item(parent_tree, proto_cmp, tvb, 0, -1, FALSE);
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tree = proto_item_add_subtree(item, ett_cmp);
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}
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dissect_cmp_pdu(tvb, pinfo, tree);
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}
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/*--- proto_register_cmp ----------------------------------------------*/
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void proto_register_cmp(void) {
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/* List of fields */
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static hf_register_info hf[] = {
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{ &hf_cmp_type_oid,
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{ "InfoType", "cmp.type.oid",
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FT_STRING, BASE_NONE, NULL, 0,
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"Type of InfoTypeAndValue", HFILL }},
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{ &hf_cmp_rm,
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{ "Record Marker", "cmp.rm",
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FT_UINT32, BASE_DEC, NULL, 0,
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"Record Marker length of PDU in bytes", HFILL }},
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{ &hf_cmp_type,
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{ "Type", "cmp.type",
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FT_UINT8, BASE_DEC, VALS(cmp_pdu_types), 0,
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"PDU Type", HFILL }},
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{ &hf_cmp_poll_ref,
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{ "Polling Reference", "cmp.poll_ref",
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FT_UINT32, BASE_HEX, NULL, 0,
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"", HFILL }},
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{ &hf_cmp_next_poll_ref,
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{ "Next Polling Reference", "cmp.next_poll_ref",
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FT_UINT32, BASE_HEX, NULL, 0,
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"", HFILL }},
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{ &hf_cmp_ttcb,
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{ "Time to check Back", "cmp.ttcb",
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FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0,
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"", HFILL }},
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#include "packet-cmp-hfarr.c"
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};
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/* List of subtrees */
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static gint *ett[] = {
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&ett_cmp,
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#include "packet-cmp-ettarr.c"
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};
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module_t *cmp_module;
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/* Register protocol */
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proto_cmp = proto_register_protocol(PNAME, PSNAME, PFNAME);
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/* Register fields and subtrees */
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proto_register_field_array(proto_cmp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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cmp_module = prefs_register_protocol(proto_cmp, NULL);
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prefs_register_bool_preference(cmp_module, "desegment",
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"Reassemble CMP-over-TCP messages spanning multiple TCP segments",
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"Whether the CMP-over-TCP dissector should reassemble messages spanning multiple TCP segments. "
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"To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
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&cmp_desegment);
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}
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/*--- proto_reg_handoff_cmp -------------------------------------------*/
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void proto_reg_handoff_cmp(void) {
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dissector_handle_t cmp_http_handle;
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dissector_handle_t cmp_tcp_handle;
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cmp_http_handle = new_create_dissector_handle(dissect_cmp_http, proto_cmp);
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dissector_add_string("media_type", "application/pkixcmp", cmp_http_handle);
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cmp_tcp_handle = new_create_dissector_handle(dissect_cmp_tcp, proto_cmp);
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dissector_add("tcp.port", TCP_PORT_CMP, cmp_tcp_handle);
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/*#include "packet-cmp-dis-tab.c"*/
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}
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