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wireshark/packet-eapol.c

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/* packet-eapol.c
* Routines for EAPOL 802.1X authentication header disassembly
* (From IEEE Draft P802.1X/D11; is there a later draft, or a
* final standard? If so, check it.)
*
* $Id: packet-eapol.c,v 1.16 2003/11/13 23:38:32 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include "packet-ieee80211.h"
#include "etypes.h"
static int proto_eapol = -1;
static int hf_eapol_version = -1;
static int hf_eapol_type = -1;
static int hf_eapol_len = -1;
static int hf_eapol_keydes_type = -1;
static int hf_eapol_keydes_keylen = -1;
static int hf_eapol_keydes_replay_counter = -1;
static int hf_eapol_keydes_key_iv = -1;
static int hf_eapol_keydes_key_index_keytype = -1;
static int hf_eapol_keydes_key_index_indexnum = -1;
static int hf_eapol_keydes_key_signature = -1;
static int hf_eapol_keydes_key = -1;
static int hf_eapol_wpa_keydes_keyinfo = -1;
static int hf_eapol_wpa_keydes_keyinfo_keydes_ver = -1;
static int hf_eapol_wpa_keydes_keyinfo_key_type = -1;
static int hf_eapol_wpa_keydes_keyinfo_key_index = -1;
static int hf_eapol_wpa_keydes_keyinfo_install = -1;
static int hf_eapol_wpa_keydes_keyinfo_key_ack = -1;
static int hf_eapol_wpa_keydes_keyinfo_key_mic = -1;
static int hf_eapol_wpa_keydes_keyinfo_secure = -1;
static int hf_eapol_wpa_keydes_keyinfo_error = -1;
static int hf_eapol_wpa_keydes_keyinfo_request = -1;
static int hf_eapol_wpa_keydes_nonce = -1;
static int hf_eapol_wpa_keydes_rsc = -1;
static int hf_eapol_wpa_keydes_id = -1;
static int hf_eapol_wpa_keydes_mic = -1;
static int hf_eapol_wpa_keydes_datalen = -1;
static int hf_eapol_wpa_keydes_data = -1;
static gint ett_eapol = -1;
static gint ett_eapol_keydes_data = -1;
static gint ett_eapol_key_index = -1;
static gint ett_keyinfo = -1;
static dissector_handle_t eap_handle;
static dissector_handle_t data_handle;
#define EAPOL_HDR_LEN 4
#define EAP_PACKET 0
#define EAPOL_START 1
#define EAPOL_LOGOFF 2
#define EAPOL_KEY 3
#define EAPOL_ENCAP_ASF_ALERT 4
#define EAPOL_WPA_KEY 254
static const value_string eapol_type_vals[] = {
{ EAP_PACKET, "EAP Packet" },
{ EAPOL_START, "Start" },
{ EAPOL_LOGOFF, "Logoff" },
{ EAPOL_KEY, "Key" },
{ EAPOL_ENCAP_ASF_ALERT, "Encapsulated ASF Alert" },
{ 0, NULL }
};
static const value_string eapol_keydes_type_vals[] = {
{ 1, "RC4 Descriptor" },
{ EAPOL_WPA_KEY, "EAPOL WPA key" },
{ 0, NULL }
};
#define KEY_INFO_KEYDES_VER_MASK 0x0007
#define KEY_INFO_KEY_TYPE_MASK 0x0008
#define KEY_INFO_KEY_INDEX_MASK 0x0030
#define KEY_INFO_INSTALL_MASK 0x0040
#define KEY_INFO_KEY_ACK_MASK 0x0080
#define KEY_INFO_KEY_MIC_MASK 0x0100
#define KEY_INFO_SECURE_MASK 0x0200
#define KEY_INFO_ERROR_MASK 0x0400
#define KEY_INFO_REQUEST_MASK 0x0800
static const true_false_string keytype_tfs =
{ "Unicast", "Broadcast" };
static const true_false_string tfs_keyinfo_key_type =
{ "Pairwise key", "Group key" };
#define KEYDES_VER_TYPE1 0x01
#define KEYDES_VER_TYPE2 0x02
static const value_string keydes_ver[] = {
{ KEYDES_VER_TYPE1, "HMAC-MD5 for MIC and RC4 for encryption" },
{ KEYDES_VER_TYPE2, "AES-CBC-MAC for MIC and HMAC-SHA1 for encryption" },
{ 0, NULL }
};
static void
dissect_eapol(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
int offset = 0;
guint8 eapol_type;
guint8 keydesc_type;
guint16 eapol_len;
guint len;
guint16 eapol_key_len, eapol_data_len;
guint8 key_index;
guint16 keyinfo;
proto_tree *ti = NULL;
proto_tree *eapol_tree = NULL;
proto_tree *keyinfo_item = NULL;
proto_tree *keyinfo_tree = NULL;
proto_tree *key_index_tree, *keydes_tree;
tvbuff_t *next_tvb;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "EAPOL");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
if (tree) {
ti = proto_tree_add_item(tree, proto_eapol, tvb, 0, -1, FALSE);
eapol_tree = proto_item_add_subtree(ti, ett_eapol);
proto_tree_add_item(eapol_tree, hf_eapol_version, tvb, offset, 1, FALSE);
}
offset++;
eapol_type = tvb_get_guint8(tvb, offset);
if (tree)
proto_tree_add_uint(eapol_tree, hf_eapol_type, tvb, offset, 1, eapol_type);
if (check_col(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(eapol_type, eapol_type_vals, "Unknown type (0x%02X)"));
offset++;
eapol_len = tvb_get_ntohs(tvb, offset);
len = EAPOL_HDR_LEN + eapol_len;
set_actual_length(tvb, len);
if (tree) {
proto_item_set_len(ti, len);
proto_tree_add_uint(eapol_tree, hf_eapol_len, tvb, offset, 2, eapol_len);
}
offset += 2;
switch (eapol_type) {
case EAP_PACKET:
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
call_dissector(eap_handle, next_tvb, pinfo, eapol_tree);
break;
case EAPOL_KEY:
if (tree) {
keydesc_type = tvb_get_guint8(tvb, offset);
proto_tree_add_item(eapol_tree, hf_eapol_keydes_type, tvb, offset, 1, FALSE);
offset += 1;
if (keydesc_type == EAPOL_WPA_KEY) {
keyinfo = tvb_get_ntohs(tvb, offset);
keyinfo_item =
proto_tree_add_uint(eapol_tree, hf_eapol_wpa_keydes_keyinfo, tvb,
offset, 2, keyinfo);
keyinfo_tree = proto_item_add_subtree(keyinfo_item, ett_keyinfo);
proto_tree_add_uint(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_keydes_ver, tvb, offset, 2, keyinfo);
proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_key_type, tvb, offset, 2, keyinfo);
proto_tree_add_uint(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_key_index, tvb, offset, 2, keyinfo);
proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_install, tvb, offset, 2, keyinfo);
proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_key_ack, tvb, offset, 2, keyinfo);
proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_key_mic, tvb, offset, 2, keyinfo);
proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_secure, tvb, offset, 2, keyinfo);
proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_error, tvb, offset, 2, keyinfo);
proto_tree_add_boolean(keyinfo_tree, hf_eapol_wpa_keydes_keyinfo_request, tvb, offset, 2, keyinfo);
offset += 2;
proto_tree_add_uint(eapol_tree, hf_eapol_keydes_keylen, tvb, offset,
2, tvb_get_ntohs(tvb, offset));
offset += 2;
proto_tree_add_item(eapol_tree, hf_eapol_keydes_replay_counter, tvb,
offset, 8, FALSE);
offset += 8;
proto_tree_add_item(eapol_tree, hf_eapol_wpa_keydes_nonce, tvb, offset,
32, FALSE);
offset += 32;
proto_tree_add_item(eapol_tree, hf_eapol_keydes_key_iv, tvb,
offset, 16, FALSE);
offset += 16;
proto_tree_add_item(eapol_tree, hf_eapol_wpa_keydes_rsc, tvb, offset,
8, FALSE);
offset += 8;
proto_tree_add_item(eapol_tree, hf_eapol_wpa_keydes_id, tvb, offset, 8,
FALSE);
offset += 8;
proto_tree_add_item(eapol_tree, hf_eapol_wpa_keydes_mic, tvb, offset,
16, FALSE);
offset += 16;
eapol_data_len = tvb_get_ntohs(tvb, offset);
proto_tree_add_uint(eapol_tree, hf_eapol_wpa_keydes_datalen, tvb,
offset, 2, eapol_data_len);
offset += 2;
if (eapol_data_len != 0) {
ti = proto_tree_add_item(eapol_tree, hf_eapol_wpa_keydes_data,
tvb, offset, eapol_data_len, FALSE);
keydes_tree = proto_item_add_subtree(ti, ett_eapol_keydes_data);
ieee_80211_add_tagged_parameters(tvb, offset, keydes_tree,
eapol_data_len);
}
}
else {
eapol_key_len = tvb_get_ntohs(tvb, offset);
proto_tree_add_uint(eapol_tree, hf_eapol_keydes_keylen, tvb, offset, 2, eapol_key_len);
offset += 2;
proto_tree_add_item(eapol_tree, hf_eapol_keydes_replay_counter, tvb,
offset, 8, FALSE);
offset += 8;
proto_tree_add_item(eapol_tree, hf_eapol_keydes_key_iv, tvb,
offset, 16, FALSE);
offset += 16;
key_index = tvb_get_guint8(tvb, offset);
ti = proto_tree_add_text(eapol_tree, tvb, offset, 1,
"Key Index: %s, index %u",
(key_index & 0x80) ? "unicast" : "broadcast",
key_index & 0x7F);
key_index_tree = proto_item_add_subtree(ti, ett_eapol_key_index);
proto_tree_add_boolean(eapol_tree, hf_eapol_keydes_key_index_keytype,
tvb, offset, 1, key_index);
proto_tree_add_uint(eapol_tree, hf_eapol_keydes_key_index_indexnum,
tvb, offset, 1, key_index);
offset += 1;
proto_tree_add_item(eapol_tree, hf_eapol_keydes_key_signature, tvb,
offset, 16, FALSE);
offset += 16;
if (eapol_key_len != 0)
proto_tree_add_item(eapol_tree, hf_eapol_keydes_key, tvb, offset,
eapol_key_len, FALSE);
}
}
break;
case EAPOL_ENCAP_ASF_ALERT: /* XXX - is this an SNMP trap? */
default:
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
call_dissector(data_handle, next_tvb, pinfo, eapol_tree);
break;
}
}
void
proto_register_eapol(void)
{
static hf_register_info hf[] = {
{ &hf_eapol_version, {
"Version", "eapol.version", FT_UINT8, BASE_DEC,
NULL, 0x0, "", HFILL }},
{ &hf_eapol_type, {
"Type", "eapol.type", FT_UINT8, BASE_DEC,
VALS(eapol_type_vals), 0x0, "", HFILL }},
{ &hf_eapol_len, {
"Length", "eapol.len", FT_UINT16, BASE_DEC,
NULL, 0x0, "Length", HFILL }},
{ &hf_eapol_keydes_type, {
"Descriptor Type", "eapol.keydes.type", FT_UINT8, BASE_DEC,
VALS(eapol_keydes_type_vals), 0x0, "Key Descriptor Type", HFILL }},
{ &hf_eapol_keydes_keylen, {
"Key Length", "eapol.keydes.keylen", FT_UINT16, BASE_DEC,
NULL, 0x0, "Key Length", HFILL }},
{ &hf_eapol_keydes_replay_counter, {
"Replay Counter", "eapol.keydes.replay_counter", FT_UINT64, BASE_DEC,
NULL, 0x0, "Replay Counter", HFILL }},
{ &hf_eapol_keydes_key_iv, {
"Key IV", "eapol.keydes.key_iv", FT_BYTES, BASE_NONE,
NULL, 0x0, "Key Initialization Vector", HFILL }},
{ &hf_eapol_keydes_key_index_keytype, {
"Key Type", "eapol.keydes.index.keytype", FT_BOOLEAN, 8,
TFS(&keytype_tfs), 0x80, "Key Type (unicast/broadcast)", HFILL }},
{ &hf_eapol_keydes_key_index_indexnum, {
"Index Number", "eapol.keydes.index.indexnum", FT_UINT8, BASE_DEC,
NULL, 0x7F, "Key Index number", HFILL }},
{ &hf_eapol_keydes_key_signature, {
"Key Signature", "eapol.keydes.key_signature", FT_BYTES, BASE_NONE,
NULL, 0x0, "Key Signature", HFILL }},
{ &hf_eapol_keydes_key, {
"Key", "eapol.keydes.key", FT_BYTES, BASE_NONE,
NULL, 0x0, "Key", HFILL }},
{ &hf_eapol_wpa_keydes_keyinfo, {
"Key Information", "eapol.keydes.key_info", FT_UINT16,
BASE_HEX, NULL, 0x0, "WPA key info", HFILL }},
{ &hf_eapol_wpa_keydes_keyinfo_keydes_ver, {
"Key Descriptor Version",
"eapol.keydes.key_info.keydes_ver",
FT_UINT16, BASE_DEC, VALS(&keydes_ver),
KEY_INFO_KEYDES_VER_MASK,
"Key Descriptor Version Type", HFILL }},
{ &hf_eapol_wpa_keydes_keyinfo_key_type, {
"Key Type",
"eapol.keydes.key_info.key_type",
FT_BOOLEAN, 16, TFS(&tfs_keyinfo_key_type),
KEY_INFO_KEY_TYPE_MASK,
"Key Type (Pairwise or Group)", HFILL }},
{ &hf_eapol_wpa_keydes_keyinfo_key_index, {
"Key Index",
"eapol.keydes.key_info.key_index",
FT_UINT16, BASE_DEC, NULL,
KEY_INFO_KEY_INDEX_MASK,
"Key Index (0-3)", HFILL }},
{ &hf_eapol_wpa_keydes_keyinfo_install, {
"Install flag",
"eapol.keydes.key_info.install",
FT_BOOLEAN, 16, TFS(&flags_set_truth),
KEY_INFO_INSTALL_MASK,
"Install flag", HFILL }},
{ &hf_eapol_wpa_keydes_keyinfo_key_ack, {
"Key Ack flag",
"eapol.keydes.key_info.key_ack",
FT_BOOLEAN, 16, TFS(&flags_set_truth),
KEY_INFO_KEY_ACK_MASK,
"Key Ack flag", HFILL }},
{ &hf_eapol_wpa_keydes_keyinfo_key_mic, {
"Key MIC flag",
"eapol.keydes.key_info.key_mic",
FT_BOOLEAN, 16, TFS(&flags_set_truth),
KEY_INFO_KEY_MIC_MASK,
"Key MIC flag", HFILL }},
{ &hf_eapol_wpa_keydes_keyinfo_secure, {
"Secure flag",
"eapol.keydes.key_info.secure",
FT_BOOLEAN, 16, TFS(&flags_set_truth),
KEY_INFO_SECURE_MASK,
"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_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", 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);
}
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