e27d8be9d3
fix an incorrect expression to decode keydata properly svn path=/trunk/; revision=18770
437 lines
16 KiB
C
437 lines
16 KiB
C
/* packet-eapol.c
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* Routines for EAPOL 802.1X authentication header disassembly
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* (From IEEE Draft P802.1X/D11; is there a later draft, or a
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* final standard? If so, check it.)
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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-ieee80211.h"
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#include <epan/etypes.h>
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static int proto_eapol = -1;
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static int hf_eapol_version = -1;
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static int hf_eapol_type = -1;
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static int hf_eapol_len = -1;
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static int hf_eapol_keydes_type = -1;
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static int hf_eapol_keydes_keylen = -1;
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static int hf_eapol_keydes_replay_counter = -1;
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static int hf_eapol_keydes_key_iv = -1;
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static int hf_eapol_keydes_key_index_keytype = -1;
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static int hf_eapol_keydes_key_index_indexnum = -1;
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static int hf_eapol_keydes_key_signature = -1;
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static int hf_eapol_keydes_key = -1;
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static int hf_eapol_wpa_keydes_keyinfo = -1;
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static int hf_eapol_wpa_keydes_keyinfo_keydes_ver = -1;
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static int hf_eapol_wpa_keydes_keyinfo_key_type = -1;
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static int hf_eapol_wpa_keydes_keyinfo_key_index = -1;
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static int hf_eapol_wpa_keydes_keyinfo_install = -1;
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static int hf_eapol_wpa_keydes_keyinfo_key_ack = -1;
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static int hf_eapol_wpa_keydes_keyinfo_key_mic = -1;
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static int hf_eapol_wpa_keydes_keyinfo_secure = -1;
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static int hf_eapol_wpa_keydes_keyinfo_error = -1;
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static int hf_eapol_wpa_keydes_keyinfo_request = -1;
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static int hf_eapol_wpa_keydes_keyinfo_encr_key_data = -1;
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static int hf_eapol_wpa_keydes_nonce = -1;
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static int hf_eapol_wpa_keydes_rsc = -1;
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static int hf_eapol_wpa_keydes_id = -1;
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static int hf_eapol_wpa_keydes_mic = -1;
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static int hf_eapol_wpa_keydes_datalen = -1;
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static int hf_eapol_wpa_keydes_data = -1;
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static gint ett_eapol = -1;
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static gint ett_eapol_keydes_data = -1;
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static gint ett_eapol_key_index = -1;
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static gint ett_keyinfo = -1;
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static dissector_handle_t eap_handle;
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static dissector_handle_t data_handle;
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#define EAPOL_HDR_LEN 4
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#define EAP_PACKET 0
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#define EAPOL_START 1
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#define EAPOL_LOGOFF 2
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#define EAPOL_KEY 3
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#define EAPOL_ENCAP_ASF_ALERT 4
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#define EAPOL_RSN_KEY 2 /* TBD, may change in final IEEE 802.1X-REV
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*/
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#define EAPOL_WPA_KEY 254
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static const value_string eapol_type_vals[] = {
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{ EAP_PACKET, "EAP Packet" },
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{ EAPOL_START, "Start" },
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{ EAPOL_LOGOFF, "Logoff" },
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{ EAPOL_KEY, "Key" },
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{ EAPOL_ENCAP_ASF_ALERT, "Encapsulated ASF Alert" },
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{ 0, NULL }
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};
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static const value_string eapol_keydes_type_vals[] = {
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{ 1, "RC4 Descriptor" },
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{ EAPOL_RSN_KEY, "EAPOL RSN key" },
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{ EAPOL_WPA_KEY, "EAPOL WPA key" },
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{ 0, NULL }
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};
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#define KEY_INFO_KEYDES_VER_MASK 0x0007
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#define KEY_INFO_KEY_TYPE_MASK 0x0008
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#define KEY_INFO_KEY_INDEX_MASK 0x0030
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#define KEY_INFO_INSTALL_MASK 0x0040
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#define KEY_INFO_KEY_ACK_MASK 0x0080
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#define KEY_INFO_KEY_MIC_MASK 0x0100
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#define KEY_INFO_SECURE_MASK 0x0200
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#define KEY_INFO_ERROR_MASK 0x0400
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#define KEY_INFO_REQUEST_MASK 0x0800
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#define KEY_INFO_ENCR_KEY_DATA_MASK 0x1000
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static const true_false_string keytype_tfs =
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{ "Unicast", "Broadcast" };
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static const true_false_string tfs_keyinfo_key_type =
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{ "Pairwise key", "Group key" };
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#define KEYDES_VER_TYPE1 0x01
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#define KEYDES_VER_TYPE2 0x02
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static const value_string keydes_ver[] = {
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{ KEYDES_VER_TYPE1, "HMAC-MD5 for MIC and RC4 for encryption" },
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{ KEYDES_VER_TYPE2, "HMAC-SHA1 for MIC and AES-CCMP for encryption" },
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{ 0, NULL }
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};
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static void
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dissect_eapol(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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guint8 eapol_type;
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guint8 keydesc_type;
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guint16 eapol_len;
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guint len;
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guint16 eapol_key_len, eapol_data_len;
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guint8 key_index;
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guint16 keyinfo;
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proto_tree *ti = NULL;
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proto_tree *eapol_tree = NULL;
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proto_tree *keyinfo_item = NULL;
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proto_tree *keyinfo_tree = NULL;
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proto_tree *key_index_tree, *keydes_tree;
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tvbuff_t *next_tvb;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "EAPOL");
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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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if (tree) {
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ti = proto_tree_add_item(tree, proto_eapol, tvb, 0, -1, FALSE);
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eapol_tree = proto_item_add_subtree(ti, ett_eapol);
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proto_tree_add_item(eapol_tree, hf_eapol_version, tvb, offset, 1, FALSE);
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}
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offset++;
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eapol_type = tvb_get_guint8(tvb, offset);
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if (tree)
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proto_tree_add_uint(eapol_tree, hf_eapol_type, tvb, offset, 1, eapol_type);
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_str(pinfo->cinfo, COL_INFO,
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val_to_str(eapol_type, eapol_type_vals, "Unknown type (0x%02X)"));
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offset++;
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eapol_len = tvb_get_ntohs(tvb, offset);
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len = EAPOL_HDR_LEN + eapol_len;
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set_actual_length(tvb, len);
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if (tree) {
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proto_item_set_len(ti, len);
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proto_tree_add_uint(eapol_tree, hf_eapol_len, tvb, offset, 2, eapol_len);
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}
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offset += 2;
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switch (eapol_type) {
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case EAP_PACKET:
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next_tvb = tvb_new_subset(tvb, offset, -1, -1);
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call_dissector(eap_handle, next_tvb, pinfo, eapol_tree);
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break;
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case EAPOL_KEY:
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if (tree) {
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keydesc_type = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(eapol_tree, hf_eapol_keydes_type, tvb, offset, 1, FALSE);
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offset += 1;
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if (keydesc_type == EAPOL_WPA_KEY || keydesc_type == EAPOL_RSN_KEY) {
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keyinfo = tvb_get_ntohs(tvb, offset);
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keyinfo_item =
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proto_tree_add_uint(eapol_tree, hf_eapol_wpa_keydes_keyinfo, tvb,
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offset, 2, keyinfo);
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keyinfo_tree = proto_item_add_subtree(keyinfo_item, ett_keyinfo);
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proto_tree_add_uint(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_keydes_ver, tvb, offset, 2, keyinfo);
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proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_key_type, tvb, offset, 2, keyinfo);
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proto_tree_add_uint(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_key_index, tvb, offset, 2, keyinfo);
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proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_install, tvb, offset, 2, keyinfo);
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proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_key_ack, tvb, offset, 2, keyinfo);
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proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_key_mic, tvb, offset, 2, keyinfo);
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proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_secure, tvb, offset, 2, keyinfo);
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proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_error, tvb, offset, 2, keyinfo);
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proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_request, tvb, offset, 2, keyinfo);
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proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_encr_key_data, tvb, offset, 2, keyinfo);
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offset += 2;
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proto_tree_add_uint(eapol_tree, hf_eapol_keydes_keylen, tvb, offset,
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2, tvb_get_ntohs(tvb, offset));
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offset += 2;
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proto_tree_add_item(eapol_tree, hf_eapol_keydes_replay_counter, tvb,
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offset, 8, FALSE);
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offset += 8;
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proto_tree_add_item(eapol_tree, hf_eapol_wpa_keydes_nonce, tvb, offset,
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32, FALSE);
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offset += 32;
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proto_tree_add_item(eapol_tree, hf_eapol_keydes_key_iv, tvb,
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offset, 16, FALSE);
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offset += 16;
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proto_tree_add_item(eapol_tree, hf_eapol_wpa_keydes_rsc, tvb, offset,
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8, FALSE);
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offset += 8;
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proto_tree_add_item(eapol_tree, hf_eapol_wpa_keydes_id, tvb, offset, 8,
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FALSE);
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offset += 8;
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proto_tree_add_item(eapol_tree, hf_eapol_wpa_keydes_mic, tvb, offset,
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16, FALSE);
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offset += 16;
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eapol_data_len = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(eapol_tree, hf_eapol_wpa_keydes_datalen, tvb,
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offset, 2, eapol_data_len);
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offset += 2;
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if (eapol_data_len != 0) {
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ti = proto_tree_add_item(eapol_tree, hf_eapol_wpa_keydes_data,
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tvb, offset, eapol_data_len, FALSE);
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if ((keyinfo & KEY_INFO_ENCR_KEY_DATA_MASK) &&
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!(keyinfo & KEY_INFO_KEY_TYPE_MASK)) {
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/* RSN: EAPOL-Key Key Data is encrypted.
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* WPA: Group Keys use encrypted Key Data.
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* Cannot parse this without knowing the key. */
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} else {
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keydes_tree = proto_item_add_subtree(ti, ett_eapol_keydes_data);
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ieee_80211_add_tagged_parameters(tvb, offset, pinfo, keydes_tree,
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eapol_data_len);
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}
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}
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} else {
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eapol_key_len = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(eapol_tree, hf_eapol_keydes_keylen, tvb, offset, 2, eapol_key_len);
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offset += 2;
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proto_tree_add_item(eapol_tree, hf_eapol_keydes_replay_counter, tvb,
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offset, 8, FALSE);
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offset += 8;
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proto_tree_add_item(eapol_tree, hf_eapol_keydes_key_iv, tvb,
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offset, 16, FALSE);
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offset += 16;
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key_index = tvb_get_guint8(tvb, offset);
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ti = proto_tree_add_text(eapol_tree, tvb, offset, 1,
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"Key Index: %s, index %u",
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(key_index & 0x80) ? "unicast" : "broadcast",
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key_index & 0x7F);
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key_index_tree = proto_item_add_subtree(ti, ett_eapol_key_index);
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proto_tree_add_boolean(eapol_tree, hf_eapol_keydes_key_index_keytype,
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tvb, offset, 1, key_index);
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proto_tree_add_uint(eapol_tree, hf_eapol_keydes_key_index_indexnum,
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tvb, offset, 1, key_index);
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offset += 1;
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proto_tree_add_item(eapol_tree, hf_eapol_keydes_key_signature, tvb,
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offset, 16, FALSE);
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offset += 16;
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if (eapol_key_len != 0) {
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if (eapol_len > 44) { /* Size of rc4 key with no key content */
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proto_tree_add_item(eapol_tree, hf_eapol_keydes_key, tvb, offset,
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eapol_key_len, FALSE);
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} else {
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/* IEEE 802.1X-2004 7.6.3.6: If no bytes remain, then */
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proto_tree_add_text(eapol_tree, tvb, offset, 0, "Key: Use key locally generated by peer");
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}
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}
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}
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}
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break;
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case EAPOL_ENCAP_ASF_ALERT: /* XXX - is this an SNMP trap? */
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default:
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next_tvb = tvb_new_subset(tvb, offset, -1, -1);
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call_dissector(data_handle, next_tvb, pinfo, eapol_tree);
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break;
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}
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}
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void
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proto_register_eapol(void)
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{
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static hf_register_info hf[] = {
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{ &hf_eapol_version, {
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"Version", "eapol.version", FT_UINT8, BASE_DEC,
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NULL, 0x0, "", HFILL }},
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{ &hf_eapol_type, {
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"Type", "eapol.type", FT_UINT8, BASE_DEC,
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VALS(eapol_type_vals), 0x0, "", HFILL }},
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{ &hf_eapol_len, {
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"Length", "eapol.len", FT_UINT16, BASE_DEC,
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NULL, 0x0, "Length", HFILL }},
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{ &hf_eapol_keydes_type, {
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"Descriptor Type", "eapol.keydes.type", FT_UINT8, BASE_DEC,
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VALS(eapol_keydes_type_vals), 0x0, "Key Descriptor Type", HFILL }},
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{ &hf_eapol_keydes_keylen, {
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"Key Length", "eapol.keydes.keylen", FT_UINT16, BASE_DEC,
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NULL, 0x0, "Key Length", HFILL }},
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{ &hf_eapol_keydes_replay_counter, {
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"Replay Counter", "eapol.keydes.replay_counter", FT_UINT64, BASE_DEC,
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NULL, 0x0, "Replay Counter", HFILL }},
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{ &hf_eapol_keydes_key_iv, {
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"Key IV", "eapol.keydes.key_iv", FT_BYTES, BASE_NONE,
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NULL, 0x0, "Key Initialization Vector", HFILL }},
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{ &hf_eapol_keydes_key_index_keytype, {
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"Key Type", "eapol.keydes.index.keytype", FT_BOOLEAN, 8,
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TFS(&keytype_tfs), 0x80, "Key Type (unicast/broadcast)", HFILL }},
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{ &hf_eapol_keydes_key_index_indexnum, {
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"Index Number", "eapol.keydes.index.indexnum", FT_UINT8, BASE_DEC,
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NULL, 0x7F, "Key Index number", HFILL }},
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{ &hf_eapol_keydes_key_signature, {
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"Key Signature", "eapol.keydes.key_signature", FT_BYTES, BASE_NONE,
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NULL, 0x0, "Key Signature", HFILL }},
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{ &hf_eapol_keydes_key, {
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"Key", "eapol.keydes.key", FT_BYTES, BASE_NONE,
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NULL, 0x0, "Key", HFILL }},
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{ &hf_eapol_wpa_keydes_keyinfo, {
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"Key Information", "eapol.keydes.key_info", FT_UINT16,
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BASE_HEX, NULL, 0x0, "WPA key info", HFILL }},
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{ &hf_eapol_wpa_keydes_keyinfo_keydes_ver, {
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"Key Descriptor Version",
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"eapol.keydes.key_info.keydes_ver",
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FT_UINT16, BASE_DEC, VALS(&keydes_ver),
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KEY_INFO_KEYDES_VER_MASK,
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"Key Descriptor Version Type", HFILL }},
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{ &hf_eapol_wpa_keydes_keyinfo_key_type, {
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"Key Type",
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"eapol.keydes.key_info.key_type",
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FT_BOOLEAN, 16, TFS(&tfs_keyinfo_key_type),
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KEY_INFO_KEY_TYPE_MASK,
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"Key Type (Pairwise or Group)", HFILL }},
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{ &hf_eapol_wpa_keydes_keyinfo_key_index, {
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"Key Index",
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"eapol.keydes.key_info.key_index",
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FT_UINT16, BASE_DEC, NULL,
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KEY_INFO_KEY_INDEX_MASK,
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"Key Index (0-3) (RSN: Reserved)", HFILL }},
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{ &hf_eapol_wpa_keydes_keyinfo_install, {
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"Install flag",
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"eapol.keydes.key_info.install",
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FT_BOOLEAN, 16, TFS(&flags_set_truth),
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KEY_INFO_INSTALL_MASK,
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"Install flag", HFILL }},
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{ &hf_eapol_wpa_keydes_keyinfo_key_ack, {
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"Key Ack flag",
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"eapol.keydes.key_info.key_ack",
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FT_BOOLEAN, 16, TFS(&flags_set_truth),
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KEY_INFO_KEY_ACK_MASK,
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"Key Ack flag", HFILL }},
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{ &hf_eapol_wpa_keydes_keyinfo_key_mic, {
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"Key MIC flag",
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"eapol.keydes.key_info.key_mic",
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FT_BOOLEAN, 16, TFS(&flags_set_truth),
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KEY_INFO_KEY_MIC_MASK,
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"Key MIC flag", HFILL }},
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{ &hf_eapol_wpa_keydes_keyinfo_secure, {
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"Secure flag",
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"eapol.keydes.key_info.secure",
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FT_BOOLEAN, 16, TFS(&flags_set_truth),
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KEY_INFO_SECURE_MASK,
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"Secure flag", HFILL }},
|
|
{ &hf_eapol_wpa_keydes_keyinfo_error, {
|
|
"Error flag",
|
|
"eapol.keydes.key_info.error",
|
|
FT_BOOLEAN, 16, TFS(&flags_set_truth),
|
|
KEY_INFO_ERROR_MASK,
|
|
"Error flag", HFILL }},
|
|
{ &hf_eapol_wpa_keydes_keyinfo_request, {
|
|
"Request flag",
|
|
"eapol.keydes.key_info.request",
|
|
FT_BOOLEAN, 16, TFS(&flags_set_truth),
|
|
KEY_INFO_REQUEST_MASK,
|
|
"Request flag", HFILL }},
|
|
{ &hf_eapol_wpa_keydes_keyinfo_encr_key_data, {
|
|
"Encrypted Key Data flag",
|
|
"eapol.keydes.key_info.encr_key_data",
|
|
FT_BOOLEAN, 16, TFS(&flags_set_truth),
|
|
KEY_INFO_ENCR_KEY_DATA_MASK,
|
|
"Encrypted Key Data flag", HFILL }},
|
|
{ &hf_eapol_wpa_keydes_nonce, {
|
|
"Nonce", "eapol.keydes.nonce", FT_BYTES, BASE_NONE,
|
|
NULL, 0x0, "WPA Key Nonce", HFILL }},
|
|
{ &hf_eapol_wpa_keydes_rsc, {
|
|
"WPA Key RSC", "eapol.keydes.rsc", FT_BYTES, BASE_NONE, NULL,
|
|
0x0, "WPA Key Receive Sequence Counter", HFILL }},
|
|
{ &hf_eapol_wpa_keydes_id, {
|
|
"WPA Key ID", "eapol.keydes.id", FT_BYTES, BASE_NONE, NULL,
|
|
0x0, "WPA Key ID(RSN Reserved)", HFILL }},
|
|
{ &hf_eapol_wpa_keydes_mic, {
|
|
"WPA Key MIC", "eapol.keydes.mic", FT_BYTES, BASE_NONE, NULL,
|
|
0x0, "WPA Key Message Integrity Check", HFILL }},
|
|
{ &hf_eapol_wpa_keydes_datalen, {
|
|
"WPA Key Length", "eapol.keydes.datalen", FT_UINT16, BASE_DEC,
|
|
NULL, 0x0, "WPA Key Data Length", HFILL }},
|
|
{ &hf_eapol_wpa_keydes_data, {
|
|
"WPA Key", "eapol.keydes.data", FT_BYTES, BASE_NONE,
|
|
NULL, 0x0, "WPA Key Data", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_eapol,
|
|
&ett_eapol_keydes_data,
|
|
&ett_keyinfo,
|
|
&ett_eapol_key_index
|
|
};
|
|
|
|
proto_eapol = proto_register_protocol("802.1X Authentication", "EAPOL", "eapol");
|
|
proto_register_field_array(proto_eapol, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_eapol(void)
|
|
{
|
|
dissector_handle_t eapol_handle;
|
|
|
|
/*
|
|
* Get handles for the EAP and raw data dissectors.
|
|
*/
|
|
eap_handle = find_dissector("eap");
|
|
data_handle = find_dissector("data");
|
|
|
|
eapol_handle = create_dissector_handle(dissect_eapol, proto_eapol);
|
|
dissector_add("ethertype", ETHERTYPE_EAPOL, eapol_handle);
|
|
dissector_add("ethertype", ETHERTYPE_RSN_PREAUTH, eapol_handle);
|
|
}
|