forked from osmocom/wireshark
![Ronnie Sahlberg](/assets/img/avatar_default.png)
Microsoft Group Policy : Encrypted File System Extension MS-GPEF svn path=/trunk/; revision=26323
196 lines
5.3 KiB
C
196 lines
5.3 KiB
C
/* packet-gpef.c
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* Routines for dissection of Group Policy : Encrypted File System Extension
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* Described in Microsoft document MS-GPEF.pdf
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* Copyright 2008, Ronnie Sahlberg
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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 "packet-windows-common.h"
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#include <epan/asn1.h>
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#include "packet-x509af.h"
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#include "packet-x509if.h"
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static int proto_gpef = -1;
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static int hf_gpef_keycount = -1;
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static int hf_gpef_efskey = -1;
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static int hf_gpef_efskey_length1 = -1;
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static int hf_gpef_efskey_length2 = -1;
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static int hf_gpef_efskey_sid_offset = -1;
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static int hf_gpef_efskey_cert_offset = -1;
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static int hf_gpef_efskey_cert_length = -1;
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static int hf_gpef_efskey_certificate = -1;
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static gint ett_gpef = -1;
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static gint ett_gpef_efskey = -1;
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/* MS-GPEF section 2.2.1.2.2 EfsKey*/
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static int
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dissect_gpef_efskey(tvbuff_t *tvb, int offset, 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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int old_offset = offset;
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guint32 length1, sid_offset;
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guint32 cert_length, cert_offset;
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tvbuff_t *next_tvb;
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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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if (parent_tree) {
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item = proto_tree_add_item(parent_tree, hf_gpef_efskey, tvb, -1, -1, FALSE);
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tree = proto_item_add_subtree(item, ett_gpef_efskey);
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}
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/* length 1 */
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length1 = tvb_get_letohl(tvb, offset);
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proto_tree_add_item(tree, hf_gpef_efskey_length1, tvb, offset, 4, TRUE);
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offset += 4;
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/* length 2 */
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proto_tree_add_item(tree, hf_gpef_efskey_length2, tvb, offset, 4, TRUE);
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offset += 4;
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/* sid offset */
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sid_offset = tvb_get_letohl(tvb, offset);
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proto_tree_add_item(tree, hf_gpef_efskey_sid_offset, tvb, offset, 4, TRUE);
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offset += 4;
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/* reserved */
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offset += 4;
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/* cert length */
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cert_length = tvb_get_letohl(tvb, offset);
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proto_tree_add_item(tree, hf_gpef_efskey_cert_length, tvb, offset, 4, TRUE);
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offset += 4;
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/* cert offset */
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cert_offset = tvb_get_letohl(tvb, offset);
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proto_tree_add_item(tree, hf_gpef_efskey_cert_offset, tvb, offset, 4, TRUE);
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offset += 4;
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/* reserved, must be 0x20 0x00 0x00 0x00 */
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offset += 4;
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/* sid */
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dissect_nt_sid(tvb, old_offset+4+sid_offset, tree, "sid", NULL, -1);
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/* certificate */
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next_tvb = tvb_new_subset(tvb, old_offset+4+cert_offset, cert_length, cert_length);
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(void)dissect_x509af_Certificate(FALSE, next_tvb, 0, &asn1_ctx, tree, hf_gpef_efskey_certificate);
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offset = old_offset + length1;
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proto_item_set_len(item, offset-old_offset);
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return offset;
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}
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/* MS-GPEF section 2.2.1.2.1 */
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static int
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dissect_gpef_efsblob(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *parent_tree)
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{
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int offset = 0;
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proto_tree *tree = NULL;
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proto_item *item = NULL;
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guint32 count;
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if (parent_tree) {
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item = proto_tree_add_item(parent_tree, proto_gpef, tvb, 0, -1, FALSE);
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tree = proto_item_add_subtree(item, ett_gpef);
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}
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/* reserved, must be 0x01 0x00 0x01 0x00 */
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offset += 4;
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/* key count */
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count = tvb_get_letohl(tvb, offset);
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proto_tree_add_item(tree, hf_gpef_keycount, tvb, offset, 4, TRUE);
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offset += 4;
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while (count--) {
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offset = dissect_gpef_efskey(tvb, offset, pinfo, tree);
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}
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return offset;
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}
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void
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proto_register_gpef(void)
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{
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static hf_register_info hf[] = {
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{ &hf_gpef_keycount,
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{ "Key Count", "gpef.key_count", FT_UINT32, BASE_DEC, NULL,
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0x0, "", HFILL }},
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{ &hf_gpef_efskey_length1,
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{ "Length1", "gpef.efskey.length1", FT_UINT32, BASE_DEC, NULL,
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0x0, "", HFILL }},
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{ &hf_gpef_efskey_length2,
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{ "Length2", "gpef.efskey.length2", FT_UINT32, BASE_DEC, NULL,
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0x0, "", HFILL }},
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{ &hf_gpef_efskey_sid_offset,
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{ "SID Offset", "gpef.efskey.sid_offset", FT_UINT32, BASE_DEC, NULL,
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0x0, "", HFILL }},
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{ &hf_gpef_efskey_cert_offset,
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{ "Cert Offset", "gpef.efskey.cert_offset", FT_UINT32, BASE_DEC, NULL,
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0x0, "", HFILL }},
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{ &hf_gpef_efskey_cert_length,
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{ "Cert Length", "gpef.efskey.cert_length", FT_UINT32, BASE_DEC, NULL,
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0x0, "", HFILL }},
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{ &hf_gpef_efskey,
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{ "EfsKey", "gpef.efskey", FT_NONE, BASE_NONE, NULL,
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0x0, "", HFILL }},
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{ &hf_gpef_efskey_certificate,
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{ "Certificate", "gpef.efskey.certificate", FT_NONE, BASE_NONE, NULL,
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0x0, "Certificate", HFILL }},
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};
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static gint *ett[] = {
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&ett_gpef,
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&ett_gpef_efskey,
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};
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proto_gpef = proto_register_protocol("GPEF", "GPEF", "gpef");
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proto_register_field_array(proto_gpef, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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new_register_dissector("efsblob", dissect_gpef_efsblob, proto_gpef);
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}
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void
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proto_reg_handoff_gpef(void)
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{
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}
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