![Graeme Lunt](/assets/img/avatar_default.png)
Used by direct approach RDP for NTLMSSP authentication under SSL. svn path=/trunk/; revision=39196
167 lines
4.7 KiB
C
167 lines
4.7 KiB
C
/* packet-credssp.c
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* Routines for CredSSP (Credential Security Support Provider) packet dissection
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* Graeme Lunt 2011
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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/asn1.h>
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#include "packet-ber.h"
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#include "packet-credssp.h"
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#define PNAME "Credential Security Support Provider"
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#define PSNAME "CredSSP"
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#define PFNAME "credssp"
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#define TS_PASSWORD_CREDS 1
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#define TS_SMARTCARD_CREDS 2
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static gint creds_type;
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/* Initialize the protocol and registered fields */
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static int proto_credssp = -1;
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/* List of dissectors to call for negoToken data */
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static heur_dissector_list_t credssp_heur_subdissector_list;
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static int hf_credssp_TSPasswordCreds = -1; /* TSPasswordCreds */
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static int hf_credssp_TSSmartCardCreds = -1; /* TSSmartCardCreds */
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static int hf_credssp_TSCredentials = -1; /* TSCredentials */
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#include "packet-credssp-hf.c"
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/* Initialize the subtree pointers */
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static gint ett_credssp = -1;
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#include "packet-credssp-ett.c"
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#include "packet-credssp-fn.c"
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/*
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* Dissect CredSSP PDUs
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*/
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static void
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dissect_credssp(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(parent_tree){
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item = proto_tree_add_item(parent_tree, proto_credssp, tvb, 0, -1, ENC_NA);
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tree = proto_item_add_subtree(item, ett_credssp);
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}
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CredSSP");
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col_clear(pinfo->cinfo, COL_INFO);
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creds_type = -1;
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dissect_TSRequest_PDU(tvb, pinfo, tree);
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}
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static gboolean
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dissect_credssp_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
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{
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asn1_ctx_t asn1_ctx;
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int offset = 0;
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gint8 class;
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gboolean pc;
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gint32 tag;
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guint32 length;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
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/* Look for SEQUENCE, CONTEXT 0, and INTEGER 2 */
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if(tvb_length(tvb) > 7) {
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offset = get_ber_identifier(tvb, offset, &class, &pc, &tag);
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if((class == BER_CLASS_UNI) && (tag == BER_UNI_TAG_SEQUENCE) && (pc == TRUE)) {
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offset = get_ber_length(tvb, offset, NULL, NULL);
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offset = get_ber_identifier(tvb, offset, &class, &pc, &tag);
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if((class == BER_CLASS_CON) && (tag == 0)) {
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offset = get_ber_length(tvb, offset, NULL, NULL);
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offset = get_ber_identifier(tvb, offset, &class, &pc, &tag);
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if((class == BER_CLASS_UNI) && (tag == BER_UNI_TAG_INTEGER)) {
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offset = get_ber_length(tvb, offset, &length, NULL);
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if((length == 1) && (tvb_get_guint8(tvb, offset) == 2)) {
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dissect_credssp(tvb, pinfo, parent_tree);
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return TRUE;
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}
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}
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}
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}
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}
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return FALSE;
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}
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/*--- proto_register_credssp -------------------------------------------*/
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void proto_register_credssp(void) {
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/* List of fields */
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static hf_register_info hf[] =
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{
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{ &hf_credssp_TSPasswordCreds,
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{ "TSPasswordCreds", "credssp.TSPasswordCreds",
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FT_NONE, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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{ &hf_credssp_TSSmartCardCreds,
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{ "TSSmartCardCreds", "credssp.TSSmartCardCreds",
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FT_NONE, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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{ &hf_credssp_TSCredentials,
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{ "TSCredentials", "credssp.TSCredentials",
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FT_NONE, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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#include "packet-credssp-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_credssp,
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#include "packet-credssp-ettarr.c"
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};
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/* Register protocol */
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proto_credssp = proto_register_protocol(PNAME, PSNAME, PFNAME);
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register_dissector("credssp", dissect_credssp, proto_credssp);
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/* Register fields and subtrees */
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proto_register_field_array(proto_credssp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* heuristic dissectors for any premable e.g. CredSSP before RDP */
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register_heur_dissector_list("credssp", &credssp_heur_subdissector_list);
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}
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/*--- proto_reg_handoff_credssp --- */
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void proto_reg_handoff_credssp(void) {
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heur_dissector_add("ssl", dissect_credssp_heur, proto_credssp);
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}
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