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/* packet-eap.c
* Routines for EAP Extensible Authentication Protocol dissection
* RFC 2284
*
* $Id: packet-eap.c,v 1.15 2002/02/26 11:55:37 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
#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"
#include "packet-ipx.h"
#include "packet-llc.h"
#include "etypes.h"
#include "ppptypes.h"
static int proto_eap = -1;
static int hf_eap_code = -1;
static int hf_eap_identifier = -1;
static int hf_eap_len = -1;
static int hf_eap_type = -1;
static gint ett_eap = -1;
static dissector_handle_t ssl_handle;
#define EAP_REQUEST 1
#define EAP_RESPONSE 2
#define EAP_SUCCESS 3
#define EAP_FAILURE 4
static const value_string eap_code_vals[] = {
{ EAP_REQUEST, "Request" },
{ EAP_RESPONSE, "Response" },
{ EAP_SUCCESS, "Success" },
{ EAP_FAILURE, "Failure" },
{ 0, NULL }
};
#define EAP_TYPE_TLS 13
static const value_string eap_type_vals[] = {
{ 1, "Identity" },
{ 2, "Notification" },
{ 3, "Nak (Response only)" },
{ 4, "MD5-Challenge" },
{ 5, "One-Time Password (OTP) (RFC 1938)" },
{ 6, "Generic Token Card" },
{ EAP_TYPE_TLS, "EAP/TLS (RFC2716)" },
{ 0, NULL }
};
static int
dissect_eap_data(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
gboolean fragmented)
{
guint8 eap_code;
guint8 eap_id;
guint16 eap_len;
guint8 eap_type;
gint len;
proto_tree *ti;
proto_tree *eap_tree = NULL;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "EAP");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
eap_code = tvb_get_guint8(tvb, 0);
if (check_col(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(eap_code, eap_code_vals, "Unknown code (0x%02X)"));
eap_len = tvb_get_ntohs(tvb, 2);
len = eap_len;
if (fragmented) {
/*
* This is an EAP fragment inside, for example, RADIUS. If we don't
* have all of the packet data, return the negative of the amount of
* additional data we need.
*/
int reported_len = tvb_reported_length_remaining(tvb, 0);
if (reported_len < len)
return -(len - reported_len);
}
if (tree) {
ti = proto_tree_add_item(tree, proto_eap, tvb, 0, len, FALSE);
eap_tree = proto_item_add_subtree(ti, ett_eap);
proto_tree_add_uint(eap_tree, hf_eap_code, tvb, 0, 1, eap_code);
}
if (tree)
proto_tree_add_item(eap_tree, hf_eap_identifier, tvb, 1, 1, FALSE);
if (tree)
proto_tree_add_uint(eap_tree, hf_eap_len, tvb, 2, 2, eap_len);
switch (eap_code) {
case EAP_REQUEST:
case EAP_RESPONSE:
eap_type = tvb_get_guint8(tvb, 4);
if (check_col(pinfo->cinfo, COL_INFO))
col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
val_to_str(eap_type, eap_type_vals,
"Unknown type (0x%02X)"));
if (tree) {
proto_tree_add_uint(eap_tree, hf_eap_type, tvb, 4, 1, eap_type);
if (len > 5) {
int offset = 5;
gint size = len - offset;
switch (eap_type) {
case EAP_TYPE_TLS:
{
guint8 flags = tvb_get_guint8(tvb, offset);
proto_tree_add_text(eap_tree, tvb, offset, 1, "Flags(%i): %s%s%s",
flags,
flags & 128 ? "Length " : "",
flags & 64 ? "More " : "",
flags & 32 ? "Start " : "");
size--;
offset++;
if (flags >> 7) {
guint32 length = tvb_get_ntohl(tvb, offset);
proto_tree_add_text(eap_tree, tvb, offset, 4, "Length: %i",
length);
size -= 4;
offset += 4;
}
if (size>0) {
tvbuff_t *next_tvb;
gint tvb_len;
tvb_len = tvb_length_remaining(tvb, offset);
if (size < tvb_len)
tvb_len = size;
next_tvb = tvb_new_subset(tvb, offset, tvb_len, size);
call_dissector(ssl_handle, next_tvb, pinfo, eap_tree);
}
}
break;
default:
proto_tree_add_text(eap_tree, tvb, offset, size,
"Type-Data (%d byte%s) Value: %s",
size, plurality(size, "", "s"),
tvb_format_text(tvb, offset, size));
break;
}
}
}
}
return tvb_length(tvb);
}
static int
dissect_eap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
return dissect_eap_data(tvb, pinfo, tree, FALSE);
}
static int
dissect_eap_fragment(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
return dissect_eap_data(tvb, pinfo, tree, TRUE);
}
void
proto_register_eap(void)
{
static hf_register_info hf[] = {
{ &hf_eap_code, {
"Code", "eap.code", FT_UINT8, BASE_DEC,
VALS(eap_code_vals), 0x0, "", HFILL }},
{ &hf_eap_identifier, {
"Id", "eap.id", FT_UINT8, BASE_DEC,
NULL, 0x0, "", HFILL }},
{ &hf_eap_len, {
"Length", "eap.len", FT_UINT16, BASE_DEC,
NULL, 0x0, "", HFILL }},
{ &hf_eap_type, {
"Type", "eap.type", FT_UINT8, BASE_DEC,
VALS(eap_type_vals), 0x0, "", HFILL }},
};
static gint *ett[] = {
&ett_eap,
};
proto_eap = proto_register_protocol("Extensible Authentication Protocol",
"EAP", "eap");
proto_register_field_array(proto_eap, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
new_register_dissector("eap", dissect_eap, proto_eap);
new_register_dissector("eap_fragment", dissect_eap_fragment, proto_eap);
}
void
proto_reg_handoff_eap(void)
{
dissector_handle_t eap_handle;
/*
* Get a handle for the SSL/TLS dissector.
*/
ssl_handle = find_dissector("ssl");
eap_handle = find_dissector("eap");
dissector_add("ppp.protocol", PPP_EAP, eap_handle);
}
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