/* 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 1.7 2002/02/22 21:51:18 guy Exp $
+ * $Id: packet-eapol.c,v 1.13 2003/06/03 01:20:14 gerald 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.
# include "config.h"
#endif
-#ifdef HAVE_SYS_TYPES_H
-# include <sys/types.h>
-#endif
-
-#ifdef HAVE_NETINET_IN_H
-# include <netinet/in.h>
-#endif
-
#include <glib.h>
#include <epan/packet.h>
#include "packet-ieee8023.h"
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_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 int tag_number = -1;
+static int tag_length = -1;
+static int tag_interpretation = -1;
static gint ett_eapol = -1;
+static gint ett_eapol_key_index = -1;
static dissector_handle_t eap_handle;
static dissector_handle_t data_handle;
-typedef struct _e_eapol
-{
- guint8 eapol_ver;
- guint8 eapol_type;
- guint16 eapol_len;
-} e_eapol;
-
-static const value_string eapol_type_vals[] = {
- { 0, "EAP" },
- { 1, "Start" },
- { 2, "Logoff" },
- { 3, "Key" },
- { 4, "Encapsulated ASF Alert" },
- { 0, NULL }
+#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 }
};
+static const true_false_string keytype_tfs =
+ { "Unicast", "Broadcast" };
+
+extern void dissect_vendor_specific_ie(proto_tree * tree, tvbuff_t * tvb,
+ int offset, int tag_number, int tag_length, int tag_interpretation);
+
static void
dissect_eapol(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
- e_eapol eapolh;
+ int offset = 0;
+ guint8 eapol_type;
+ guint8 keydesc_type;
+ guint16 eapol_len;
guint len;
- proto_tree *ti;
- proto_tree *eapol_tree;
+ guint16 eapol_key_len, eapol_data_len;
+ guint8 key_index;
+ proto_tree *ti = NULL;
+ proto_tree *eapol_tree = NULL;
+ proto_tree *key_index_tree;
tvbuff_t *next_tvb;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
- tvb_memcpy(tvb, (guint8 *)&eapolh, 0, sizeof(eapolh));
- eapolh.eapol_len = ntohs(eapolh.eapol_len);
-
- len = sizeof(eapolh) + eapolh.eapol_len;
+ if (tree) {
+ ti = proto_tree_add_item(tree, proto_eapol, tvb, 0, -1, FALSE);
+ eapol_tree = proto_item_add_subtree(ti, ett_eapol);
- set_actual_length(tvb, len);
+ proto_tree_add_item(eapol_tree, hf_eapol_version, tvb, offset, 1, FALSE);
+ }
+ offset++;
- eapol_tree = NULL;
+ 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) {
- ti = proto_tree_add_item(tree, proto_eapol, tvb, 0, len, FALSE);
- eapol_tree = proto_item_add_subtree(ti, ett_eapol);
-
- proto_tree_add_uint(eapol_tree, hf_eapol_version, tvb, 0, 1, eapolh.eapol_ver);
- proto_tree_add_uint(eapol_tree, hf_eapol_type, tvb, 1, 1, eapolh.eapol_type);
- proto_tree_add_uint(eapol_tree, hf_eapol_len, tvb, 2, 2, eapolh.eapol_len);
+ 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;
- next_tvb = tvb_new_subset(tvb, 4, -1, -1);
+ 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) {
+ proto_tree_add_uint(eapol_tree, hf_eapol_wpa_keydes_keyinfo, tvb,
+ offset, 2, tvb_get_ntohs(tvb, offset));
+ 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) {
+ proto_tree_add_item(eapol_tree, hf_eapol_wpa_keydes_data,
+ tvb, offset, eapol_data_len, FALSE);
+ dissect_vendor_specific_ie(eapol_tree, tvb, offset,
+ tag_number, tag_length, tag_interpretation);
+ offset += 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;
- if (eapolh.eapol_type == 0)
- call_dissector(eap_handle, next_tvb, pinfo, eapol_tree);
- else
- call_dissector(data_handle, next_tvb, pinfo, eapol_tree);
+ 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,
+ { &hf_eapol_version, {
+ "Version", "eapol.version", FT_UINT8, BASE_DEC,
NULL, 0x0, "", HFILL }},
- { &hf_eapol_type, {
- "Type", "eapol.type", FT_UINT8, BASE_DEC,
+ { &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_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 }},
+
+ {&tag_number, {
+ "WPA Key Interpretation", "eapol.keydes.data.wpaie",
+ FT_UINT16, BASE_DEC, NULL, 0x0, "Element ID", HFILL }},
+ {&tag_length, {
+ "WPA Key Interpretation", "eapol.keydes.data.wpaie",
+ FT_UINT16, BASE_DEC, NULL, 0, "Length of tag", HFILL }},
+ {&tag_interpretation, {
+ "WPA Key Interpretation", "eapol.keydes.data.wpaie",
+ FT_STRING, BASE_NONE, NULL, 0, "Interpretation of tag", HFILL }}
};
static gint *ett[] = {
&ett_eapol,
+ &ett_eapol_key_index
};
proto_eapol = proto_register_protocol("802.1x Authentication", "EAPOL", "eapol");
git.samba.org / obnox / wireshark / wip.git / blobdiff