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/* packet-tacacs.c
* Routines for cisco tacacs/xtacacs/tacacs+ packet dissection
* Copyright 2001, Paul Ionescu <paul@acorp.ro>
*
* $Id: packet-tacacs.c,v 1.13 2001/07/10 21:06:53 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* Copied from old packet-tacacs.c
*
* 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.
*/
/* rfc-1492 for tacacs and xtacacs
* draft-grant-tacacs-00.txt for tacacs+ (tacplus)
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <string.h>
#include <glib.h>
#include "packet.h"
static int proto_tacacs = -1;
static gint ett_tacacs = -1;
static const value_string tacacs_type_vals[] = {
{ 1 , "Login" },
{ 2 , "Response" },
{ 3 , "Change" },
{ 4 , "Follow" },
{ 5 , "Connect" },
{ 6 , "Superuser" },
{ 7 , "Logout" },
{ 8 , "Reload" },
{ 9 , "SLIP on" },
{ 10 , "SLIP off" },
{ 11 , "SLIP Addr" },
{ 0 , NULL }};
static const value_string tacacs_reason_vals[] = {
{ 0 , "none" },
{ 1 , "expiring" },
{ 2 , "password" },
{ 3 , "denied" },
{ 4 , "quit" },
{ 5 , "idle" },
{ 6 , "drop" },
{ 7 , "bad" }};
static const value_string tacacs_resp_vals[] = {
{ 0 , "this is not a response" },
{ 1 , "accepted" },
{ 2 , "rejected" }};
#define TAC_PLUS_AUTHEN 1
#define TAC_PLUS_AUTHOR 2
#define TAC_PLUS_ACCT 3
static const value_string tacplus_type_vals[] = {
{ TAC_PLUS_AUTHEN , "Authentication" },
{ TAC_PLUS_AUTHOR , "Authorization" },
{ TAC_PLUS_ACCT , "Accounting" },
{ 0 , NULL }};
#define UDP_PORT_TACACS 49
#define TCP_PORT_TACACS 49
static void
dissect_tacacs(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *tacacs_tree, *ti;
guint8 txt_buff[256],version,type,userlen,passlen;
version = tvb_get_guint8(tvb,0);
type = tvb_get_guint8(tvb,1);
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, version==0 ? "TACACS":"XTACACS");
if (check_col(pinfo->fd, COL_INFO))
col_add_str(pinfo->fd, COL_INFO, val_to_str(type, tacacs_type_vals, "Unknown Type"));
if (tree)
{
ti = proto_tree_add_protocol_format(tree, proto_tacacs,
tvb, 0, tvb_length(tvb), version==0?"TACACS":"XTACACS");
tacacs_tree = proto_item_add_subtree(ti, ett_tacacs);
proto_tree_add_text(tacacs_tree, tvb, 0, 1, "Version = %s ",version==0?"TACACS":"XTACACS" );
proto_tree_add_text(tacacs_tree, tvb, 1, 1, "Type = %s ",val_to_str(type, tacacs_type_vals, "Unknown Type"));
proto_tree_add_text(tacacs_tree, tvb, 2, 2, "Nonce = 0x%04X ",tvb_get_ntohs(tvb,2));
if (version==0)
{
if (type!=2)
{
userlen=tvb_get_guint8(tvb,4);
passlen=tvb_get_guint8(tvb,5);
proto_tree_add_text(tacacs_tree, tvb, 4, 1, "Username length = %d ",userlen);
proto_tree_add_text(tacacs_tree, tvb, 5, 1, "Password length = %d ",passlen);
tvb_get_nstringz0(tvb,6,userlen,txt_buff);
proto_tree_add_text(tacacs_tree, tvb, 6, userlen, "User = %s ",txt_buff);
tvb_get_nstringz0(tvb,6+userlen,passlen,txt_buff);
proto_tree_add_text(tacacs_tree, tvb, 6+userlen, passlen, "Password = %s ",txt_buff);
}
else
{
proto_tree_add_text(tacacs_tree, tvb, 4, 1, "Response = %s",
val_to_str(tvb_get_guint8(tvb,4), tacacs_resp_vals, "Unknown Response"));
proto_tree_add_text(tacacs_tree, tvb, 5, 1, "Reason = %s",
val_to_str(tvb_get_guint8(tvb,5), tacacs_reason_vals, "Unknown Reason"));
}
}
else
{
userlen=tvb_get_guint8(tvb,4);
passlen=tvb_get_guint8(tvb,5);
proto_tree_add_text(tacacs_tree, tvb, 4, 1, "Username length = %d ",userlen);
proto_tree_add_text(tacacs_tree, tvb, 5, 1, "Password length = %d ",passlen);
proto_tree_add_text(tacacs_tree, tvb, 6, 1, "Response = %s",
val_to_str(tvb_get_guint8(tvb,6), tacacs_resp_vals, "Unknown Response"));
proto_tree_add_text(tacacs_tree, tvb, 7, 1, "Reason = %s",
val_to_str(tvb_get_guint8(tvb,7), tacacs_reason_vals, "Unknown Reason"));
proto_tree_add_text(tacacs_tree, tvb, 8, 4, "Result1 = 0x%08X ",tvb_get_ntohl(tvb,8));
tvb_memcpy(tvb,txt_buff,12,4);
proto_tree_add_text(tacacs_tree, tvb, 12, 4, "IP addr = %s ",ip_to_str(txt_buff));
proto_tree_add_text(tacacs_tree, tvb, 16, 2, "Dst port = %d ",tvb_get_ntohs(tvb,16));
proto_tree_add_text(tacacs_tree, tvb, 18, 2, "Line = tty%d ",tvb_get_ntohs(tvb,18));
proto_tree_add_text(tacacs_tree, tvb, 20, 4, "Result2 = 0x%08X ",tvb_get_ntohl(tvb,20));
proto_tree_add_text(tacacs_tree, tvb, 24, 2, "Result3 = 0x%04X ",tvb_get_ntohs(tvb,24));
if (type!=2)
{
tvb_get_nstringz0(tvb,26,userlen,txt_buff);
proto_tree_add_text(tacacs_tree, tvb, 26, userlen, "User = %s ",txt_buff);
tvb_get_nstringz0(tvb,26+userlen,passlen,txt_buff);
proto_tree_add_text(tacacs_tree, tvb, 26+userlen, passlen, "Password = %s ",txt_buff);
}
}
}
}
static void
dissect_tacplus(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *tacacs_tree, *ti;
guint8 version,type,seq_no,flags;
guint32 len;
gboolean request=(pinfo->match_port == pinfo->destport);
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "TACACS+");
if (check_col(pinfo->fd, COL_INFO))
{
col_add_str(pinfo->fd, COL_INFO,
request ? "Request" : "Response");
}
if (tree)
{
ti = proto_tree_add_protocol_format(tree, proto_tacacs,
tvb, 0, tvb_length(tvb), "TACACS+");
version = tvb_get_guint8(tvb,0);
type = tvb_get_guint8(tvb,1);
seq_no = tvb_get_guint8(tvb,2);
flags = tvb_get_guint8(tvb,3);
len = tvb_get_ntohl(tvb,8);
tacacs_tree = proto_item_add_subtree(ti, ett_tacacs);
proto_tree_add_text(tacacs_tree, tvb, 0, 1, "Major version = %s ",(version&0xf0)==0xc0?"TACACS+":"Unknown Version" );
proto_tree_add_text(tacacs_tree, tvb, 0, 1, "Minor version = %d ",version&0xf);
proto_tree_add_text(tacacs_tree, tvb, 1, 1, "Type = %s ",val_to_str(type, tacplus_type_vals, "Unknown Type"));
proto_tree_add_text(tacacs_tree, tvb, 2, 1, "Seq. no = %d ",tvb_get_guint8(tvb,2));
proto_tree_add_text(tacacs_tree, tvb, 3, 1, "Flags = %s, %s ",
(flags&1)==0?"Encripted payload":"Unencripted payload",(flags&4)==0?"Multiple Connections":"Single connection");
proto_tree_add_text(tacacs_tree, tvb, 4, 4, "Session ID = %d ",tvb_get_ntohl(tvb,4));
proto_tree_add_text(tacacs_tree, tvb, 8, 4, "Packet len = %d ",len);
if ((flags&1)==0)
proto_tree_add_text(tacacs_tree, tvb, 12, len, "Encripted payload");
else
proto_tree_add_text(tacacs_tree, tvb, 12, len, "Payload");
}
}
void
proto_register_tacacs(void)
{
static gint *ett[] = {
&ett_tacacs,
};
proto_tacacs = proto_register_protocol("TACACS", "TACACS", "tacacs");
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_tacacs(void)
{
dissector_add("udp.port", UDP_PORT_TACACS, dissect_tacacs,
proto_tacacs);
dissector_add("tcp.port", TCP_PORT_TACACS, dissect_tacplus,
proto_tacacs);
}
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