forked from osmocom/wireshark
439 lines
14 KiB
C
439 lines
14 KiB
C
/* packet-cmp.c
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*
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* Routines for RFC2510 Certificate Management Protocol packet dissection
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* Ronnie Sahlberg 2004
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* Updated to RFC4210 CMPv2 and associated "Transport Protocols for CMP" draft
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* Martin Peylo 2008
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/oids.h>
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#include <epan/asn1.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 "packet-http.h"
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#include <epan/prefs.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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void proto_register_cmp(void);
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/* desegmentation of CMP over TCP */
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static gboolean cmp_desegment = TRUE;
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static guint cmp_alternate_tcp_port = 0;
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static guint cmp_alternate_http_port = 0;
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static guint cmp_alternate_tcp_style_http_port = 0;
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/* Initialize the protocol and registered fields */
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static int proto_cmp = -1;
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static int hf_cmp_type_oid = -1;
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static int hf_cmp_tcptrans_len = -1;
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static int hf_cmp_tcptrans_type = -1;
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static int hf_cmp_tcptrans_poll_ref = -1;
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static int hf_cmp_tcptrans_next_poll_ref = -1;
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static int hf_cmp_tcptrans_ttcb = -1;
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static int hf_cmp_tcptrans10_version = -1;
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static int hf_cmp_tcptrans10_flags = -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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#include "packet-cmp-fn.c"
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static int
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dissect_cmp_pdu(tvbuff_t *tvb, proto_tree *tree, asn1_ctx_t *actx)
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{
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return dissect_cmp_PKIMessage(FALSE, tvb, 0, actx,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 int dissect_cmp_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void *data _U_)
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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_item *ti=NULL;
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proto_tree *tree=NULL;
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proto_tree *tcptrans_tree=NULL;
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asn1_ctx_t asn1_ctx;
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int offset=0;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CMP");
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col_set_str(pinfo->cinfo, COL_INFO, "PKIXCMP");
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if(parent_tree){
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item=proto_tree_add_item(parent_tree, proto_cmp, tvb, 0, -1, ENC_NA);
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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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if (pdu_type < 10) {
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/* RFC2510 TCP transport */
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ti = proto_tree_add_item(tree, proto_cmp, tvb, offset, 5, ENC_NA);
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tcptrans_tree = proto_item_add_subtree(ti, ett_cmp);
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proto_tree_add_item(tree, hf_cmp_tcptrans_len, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_cmp_tcptrans_type, tvb, offset++, 1, ENC_BIG_ENDIAN);
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} else {
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/* post RFC2510 TCP transport - the former "type" field is now "version" */
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tcptrans_tree = proto_tree_add_subtree(tree, tvb, offset, 7, ett_cmp, NULL, "TCP transport");
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pdu_type=tvb_get_guint8(tvb, 6);
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proto_tree_add_item(tcptrans_tree, hf_cmp_tcptrans_len, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tcptrans_tree, hf_cmp_tcptrans10_version, tvb, offset++, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tcptrans_tree, hf_cmp_tcptrans10_flags, tvb, offset++, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tcptrans_tree, hf_cmp_tcptrans_type, tvb, offset++, 1, ENC_BIG_ENDIAN);
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}
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col_add_str (pinfo->cinfo, COL_INFO, val_to_str (pdu_type, cmp_pdu_types, "0x%x"));
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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, offset, tvb_length_remaining(tvb, offset), pdu_len);
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dissect_cmp_pdu(next_tvb, tree, &asn1_ctx);
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offset += tvb_length_remaining(tvb, offset);
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break;
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case CMP_TYPE_POLLREP:
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proto_tree_add_item(tcptrans_tree, hf_cmp_tcptrans_poll_ref, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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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(tcptrans_tree, hf_cmp_tcptrans_ttcb, tvb, offset, 4, &ts);
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offset += 4;
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break;
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case CMP_TYPE_POLLREQ:
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proto_tree_add_item(tcptrans_tree, hf_cmp_tcptrans_poll_ref, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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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(tcptrans_tree, hf_cmp_tcptrans_next_poll_ref, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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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(tcptrans_tree, hf_cmp_tcptrans_ttcb, tvb, offset, 4, &ts);
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offset += 4;
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next_tvb = tvb_new_subset(tvb, offset, tvb_length_remaining(tvb, offset), pdu_len);
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dissect_cmp_pdu(next_tvb, tree, &asn1_ctx);
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offset += tvb_length_remaining(tvb, offset);
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break;
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case CMP_TYPE_FINALMSGREP:
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next_tvb = tvb_new_subset(tvb, offset, tvb_length_remaining(tvb, offset), pdu_len);
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dissect_cmp_pdu(next_tvb, tree, &asn1_ctx);
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offset += tvb_length_remaining(tvb, offset);
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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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return offset;
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}
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static guint get_cmp_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb,
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int offset, void *data _U_)
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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 and "Transport Protocols for CMP" draft */
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static int
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dissect_cmp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void *data)
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{
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guint32 pdu_len;
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guint8 pdu_type;
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int offset=4; /* RFC2510 TCP transport header length */
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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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if(pdu_type == 10) {
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/* post RFC2510 TCP transport */
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pdu_type = tvb_get_guint8(tvb, 7);
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offset = 7; /* post RFC2510 TCP transport header length */
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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 3 byte for post RFC2510 TCP transport
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*/
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if((pdu_len<=2)||(pdu_len>10000)){
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return 0;
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}
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} else {
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/* RFC2510 TCP transport */
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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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/* 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 accommodate 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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}
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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, offset, get_cmp_pdu_len,
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dissect_cmp_tcp_pdu, data);
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return tvb_captured_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, void *data _U_)
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{
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proto_item *item=NULL;
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proto_tree *tree=NULL;
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asn1_ctx_t asn1_ctx;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CMP");
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col_set_str(pinfo->cinfo, COL_INFO, "PKIXCMP");
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if(parent_tree){
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item=proto_tree_add_item(parent_tree, proto_cmp, tvb, 0, -1, ENC_NA);
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tree = proto_item_add_subtree(item, ett_cmp);
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}
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return dissect_cmp_pdu(tvb, tree, &asn1_ctx);
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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_tcptrans_len,
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{ "Length", "cmp.tcptrans.length",
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FT_UINT32, BASE_DEC, NULL, 0,
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"TCP transport Length of PDU in bytes", HFILL }},
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{ &hf_cmp_tcptrans_type,
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{ "Type", "cmp.tcptrans.type",
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FT_UINT8, BASE_DEC, VALS(cmp_pdu_types), 0,
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"TCP transport PDU Type", HFILL }},
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{ &hf_cmp_tcptrans_poll_ref,
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{ "Polling Reference", "cmp.tcptrans.poll_ref",
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FT_UINT32, BASE_HEX, NULL, 0,
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"TCP transport Polling Reference", HFILL }},
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{ &hf_cmp_tcptrans_next_poll_ref,
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{ "Next Polling Reference", "cmp.tcptrans.next_poll_ref",
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FT_UINT32, BASE_HEX, NULL, 0,
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"TCP transport Next Polling Reference", HFILL }},
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{ &hf_cmp_tcptrans_ttcb,
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{ "Time to check Back", "cmp.tcptrans.ttcb",
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FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0,
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"TCP transport Time to check Back", HFILL }},
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{ &hf_cmp_tcptrans10_version,
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{ "Version", "cmp.tcptrans10.version",
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FT_UINT8, BASE_DEC, NULL, 0,
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"TCP transport version", HFILL }},
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{ &hf_cmp_tcptrans10_flags,
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{ "Flags", "cmp.tcptrans10.flags",
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FT_UINT8, BASE_DEC, NULL, 0,
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"TCP transport flags", 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, proto_reg_handoff_cmp);
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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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prefs_register_uint_preference(cmp_module, "tcp_alternate_port",
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"Alternate TCP port",
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"Decode this TCP port\'s traffic as CMP. Set to \"0\" to disable.",
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10,
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&cmp_alternate_tcp_port);
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prefs_register_uint_preference(cmp_module, "http_alternate_port",
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"Alternate HTTP port",
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"Decode this TCP port\'s traffic as CMP-over-HTTP. Set to \"0\" to disable. "
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"Use this if the Content-Type is not set correctly.",
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10,
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&cmp_alternate_http_port);
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prefs_register_uint_preference(cmp_module, "tcp_style_http_alternate_port",
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"Alternate TCP-style-HTTP port",
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"Decode this TCP port\'s traffic as TCP-transport-style CMP-over-HTTP. Set to \"0\" to disable. "
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"Use this if the Content-Type is not set correctly.",
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10,
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&cmp_alternate_tcp_style_http_port);
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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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static gboolean inited = FALSE;
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static dissector_handle_t cmp_http_handle;
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static dissector_handle_t cmp_tcp_style_http_handle;
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static dissector_handle_t cmp_tcp_handle;
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static guint cmp_alternate_tcp_port_prev = 0;
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static guint cmp_alternate_http_port_prev = 0;
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static guint cmp_alternate_tcp_style_http_port_prev = 0;
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if (!inited) {
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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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dissector_add_string("media_type", "application/x-pkixcmp", cmp_http_handle);
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cmp_tcp_style_http_handle = new_create_dissector_handle(dissect_cmp_tcp_pdu, proto_cmp);
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dissector_add_string("media_type", "application/pkixcmp-poll", cmp_tcp_style_http_handle);
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dissector_add_string("media_type", "application/x-pkixcmp-poll", cmp_tcp_style_http_handle);
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cmp_tcp_handle = new_create_dissector_handle(dissect_cmp_tcp, proto_cmp);
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dissector_add_uint("tcp.port", TCP_PORT_CMP, cmp_tcp_handle);
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oid_add_from_string("Cryptlib-presence-check","1.3.6.1.4.1.3029.3.1.1");
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oid_add_from_string("Cryptlib-PKIBoot","1.3.6.1.4.1.3029.3.1.2");
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oid_add_from_string("HMAC MD5","1.3.6.1.5.5.8.1.1");
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oid_add_from_string("HMAC SHA-1","1.3.6.1.5.5.8.1.2");
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oid_add_from_string("HMAC TIGER","1.3.6.1.5.5.8.1.3");
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oid_add_from_string("HMAC RIPEMD-160","1.3.6.1.5.5.8.1.4");
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oid_add_from_string("sha256WithRSAEncryption","1.2.840.113549.1.1.11");
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#include "packet-cmp-dis-tab.c"
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inited = TRUE;
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}
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/* change alternate TCP port if changed in the preferences */
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if (cmp_alternate_tcp_port != cmp_alternate_tcp_port_prev) {
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if (cmp_alternate_tcp_port_prev != 0)
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dissector_delete_uint("tcp.port", cmp_alternate_tcp_port_prev, cmp_tcp_handle);
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if (cmp_alternate_tcp_port != 0)
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dissector_add_uint("tcp.port", cmp_alternate_tcp_port, cmp_tcp_handle);
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cmp_alternate_tcp_port_prev = cmp_alternate_tcp_port;
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}
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/* change alternate HTTP port if changed in the preferences */
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if (cmp_alternate_http_port != cmp_alternate_http_port_prev) {
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if (cmp_alternate_http_port_prev != 0) {
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dissector_delete_uint("tcp.port", cmp_alternate_http_port_prev, NULL);
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dissector_delete_uint("http.port", cmp_alternate_http_port_prev, NULL);
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}
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if (cmp_alternate_http_port != 0)
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http_dissector_add( cmp_alternate_http_port, cmp_http_handle);
|
|
cmp_alternate_http_port_prev = cmp_alternate_http_port;
|
|
}
|
|
|
|
/* change alternate TCP-style-HTTP port if changed in the preferences */
|
|
if (cmp_alternate_tcp_style_http_port != cmp_alternate_tcp_style_http_port_prev) {
|
|
if (cmp_alternate_tcp_style_http_port_prev != 0) {
|
|
dissector_delete_uint("tcp.port", cmp_alternate_tcp_style_http_port_prev, NULL);
|
|
dissector_delete_uint("http.port", cmp_alternate_tcp_style_http_port_prev, NULL);
|
|
}
|
|
if (cmp_alternate_tcp_style_http_port != 0)
|
|
http_dissector_add( cmp_alternate_tcp_style_http_port, cmp_tcp_style_http_handle);
|
|
cmp_alternate_tcp_style_http_port_prev = cmp_alternate_tcp_style_http_port;
|
|
}
|
|
|
|
}
|
|
|