forked from osmocom/wireshark
![Martin Mathieson](/assets/img/avatar_default.png)
Change-Id: I3681462aeb98ca62ed3ec5eb226b2553317391a9 Reviewed-on: https://code.wireshark.org/review/5997 Petri-Dish: Martin Mathieson <martin.r.mathieson@googlemail.com> Reviewed-by: Martin Mathieson <martin.r.mathieson@googlemail.com>
349 lines
11 KiB
C
349 lines
11 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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* 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/etypes.h>
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#include <epan/eapol_keydes_types.h>
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void proto_register_eapol(void);
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void proto_reg_handoff_eapol(void);
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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_body = -1;
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static int hf_eapol_keydes_key_len = -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 = -1;
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static int hf_eapol_keydes_key_index_type = -1;
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static int hf_eapol_keydes_key_index_number = -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_keydes_key_generated_locally = -1;
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static gint ett_eapol = -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_table_t eapol_keydes_type_dissector_table;
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static dissector_handle_t eapol_handle;
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static dissector_handle_t eap_handle;
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static dissector_handle_t mka_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 EAPOL_2001 1
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#define EAPOL_2004 2
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#define EAPOL_2010 3
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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_MKA 5
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static const value_string eapol_version_vals[] = {
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{ EAPOL_2001, "802.1X-2001" },
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{ EAPOL_2004, "802.1X-2004" },
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{ EAPOL_2010, "802.1X-2010" },
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{ 0, NULL }
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};
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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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{ EAPOL_MKA, "MKA" },
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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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{ EAPOL_RC4_KEY, "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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static const true_false_string keytype_tfs = { "Unicast", "Broadcast" };
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#define KEYDES_KEY_INDEX_TYPE_MASK 0x80
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#define KEYDES_KEY_INDEX_NUMBER_MASK 0x7F
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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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guint16 eapol_len;
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guint8 keydesc_type;
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guint len;
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proto_tree *ti;
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proto_tree *eapol_tree;
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tvbuff_t *next_tvb;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "EAPOL");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_eapol, tvb, 0, -1, ENC_NA);
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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, ENC_BIG_ENDIAN);
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offset++;
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eapol_type = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(eapol_tree, hf_eapol_type, tvb, offset, 1, ENC_BIG_ENDIAN);
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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_item(eapol_tree, hf_eapol_len, tvb, offset, 2, ENC_BIG_ENDIAN);
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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_remaining(tvb, offset);
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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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keydesc_type = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(eapol_tree, hf_eapol_keydes_type, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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if (!dissector_try_uint_new(eapol_keydes_type_dissector_table,
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keydesc_type, next_tvb, pinfo, eapol_tree,
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FALSE, NULL))
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proto_tree_add_item(eapol_tree, hf_eapol_keydes_body, tvb, offset, -1, ENC_NA);
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break;
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case EAPOL_MKA:
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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call_dissector(mka_handle, next_tvb, pinfo, eapol_tree);
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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_remaining(tvb, offset);
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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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static int
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dissect_eapol_rc4_key(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, void *data _U_)
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{
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int offset = 0;
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guint16 eapol_key_len;
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gboolean generated_locally;
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proto_tree *ti;
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proto_tree *key_index_tree;
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gint eapol_len;
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eapol_key_len = tvb_get_ntohs(tvb, offset);
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proto_tree_add_item(tree, hf_eapol_keydes_key_len, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_eapol_keydes_replay_counter, tvb,
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offset, 8, ENC_BIG_ENDIAN);
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offset += 8;
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proto_tree_add_item(tree, hf_eapol_keydes_key_iv, tvb,
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offset, 16, ENC_NA);
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offset += 16;
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ti = proto_tree_add_item(tree, hf_eapol_keydes_key_index, tvb, offset, 1, ENC_BIG_ENDIAN);
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key_index_tree = proto_item_add_subtree(ti, ett_eapol_key_index);
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proto_tree_add_item(key_index_tree, hf_eapol_keydes_key_index_type,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(key_index_tree, hf_eapol_keydes_key_index_number,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_eapol_keydes_key_signature, tvb,
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offset, 16, ENC_NA);
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offset += 16;
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if (eapol_key_len != 0) {
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/*
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* Body length of EAPOL-Key message in which we're contained is 1 byte
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* larger than the reported length of the key descriptor we were handed,
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* that 1 byte being the Key Descriptor Type.
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*/
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eapol_len = 1 + tvb_reported_length(tvb);
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/* IEEE 802.1X-2004 7.6.3.6: If no bytes remain, then */
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generated_locally = eapol_len <= 44; /* Size of rc4 key with no key content */
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if (!generated_locally) {
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proto_tree_add_item(tree, hf_eapol_keydes_key, tvb, offset,
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eapol_key_len, ENC_NA);
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}
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proto_tree_add_boolean(tree, hf_eapol_keydes_key_generated_locally, tvb, offset,
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0, generated_locally);
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}
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return tvb_captured_length(tvb);
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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",
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FT_UINT8, BASE_DEC, VALS(eapol_version_vals), 0x0,
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NULL, HFILL }},
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{ &hf_eapol_type, {
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"Type", "eapol.type",
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FT_UINT8, BASE_DEC, VALS(eapol_type_vals), 0x0,
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NULL, HFILL }},
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{ &hf_eapol_len, {
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"Length", "eapol.len",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_eapol_keydes_type, {
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"Key Descriptor Type", "eapol.keydes.type",
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FT_UINT8, BASE_DEC, VALS(eapol_keydes_type_vals), 0x0,
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NULL, HFILL }},
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{ &hf_eapol_keydes_body, {
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"Key Descriptor Body", "eapol.keydes.body",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_eapol_keydes_key_len, {
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"Key Length", "eapol.keydes.key_len",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_eapol_keydes_replay_counter, {
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"Replay Counter", "eapol.keydes.replay_counter",
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FT_UINT64, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_eapol_keydes_key_iv, {
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"Key IV", "eapol.keydes.key_iv",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_eapol_keydes_key_index, {
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"Key Index", "eapol.keydes.key_index",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_eapol_keydes_key_index_type, {
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"Type", "eapol.keydes.key_index.type",
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FT_BOOLEAN, 8, TFS(&keytype_tfs), KEYDES_KEY_INDEX_TYPE_MASK ,
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NULL, HFILL }},
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{ &hf_eapol_keydes_key_index_number, {
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"Number", "eapol.keydes.key_index.number",
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FT_UINT8, BASE_DEC, NULL, KEYDES_KEY_INDEX_NUMBER_MASK,
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NULL, HFILL }},
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{ &hf_eapol_keydes_key_signature, {
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"Key Signature", "eapol.keydes.key_signature",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_eapol_keydes_key, {
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"Key", "eapol.keydes.key",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_eapol_keydes_key_generated_locally, {
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"Key Generated Locally", "eapol.keydes.key.generated_locally",
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FT_BOOLEAN, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_eapol,
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&ett_keyinfo,
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&ett_eapol_key_index
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};
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proto_eapol = proto_register_protocol("802.1X Authentication", "EAPOL", "eapol");
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eapol_handle = register_dissector("eapol", dissect_eapol, proto_eapol);
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proto_register_field_array(proto_eapol, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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eapol_keydes_type_dissector_table = register_dissector_table("eapol.keydes.type",
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"EAPOL Key Descriptor Type",
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FT_UINT8,
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BASE_DEC);
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}
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void
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proto_reg_handoff_eapol(void)
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{
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dissector_handle_t eapol_rc4_key_handle;
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/*
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* Get handles for the EAP and raw data dissectors.
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*/
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eap_handle = find_dissector("eap");
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mka_handle = find_dissector("mka");
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data_handle = find_dissector("data");
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dissector_add_uint("ethertype", ETHERTYPE_EAPOL, eapol_handle);
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dissector_add_uint("ethertype", ETHERTYPE_RSN_PREAUTH, eapol_handle);
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/*
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* EAPOL key descriptor types.
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*/
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eapol_rc4_key_handle = new_create_dissector_handle(dissect_eapol_rc4_key,
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proto_eapol);
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dissector_add_uint("eapol.keydes.type", EAPOL_RC4_KEY, eapol_rc4_key_handle);
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}
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/*
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* Editor modelines
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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