forked from osmocom/wireshark
467 lines
14 KiB
C
467 lines
14 KiB
C
/* packet-tacacs.c
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* Routines for cisco tacacs/xtacacs/tacacs+ packet dissection
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* Copyright 2001, Paul Ionescu <paul@acorp.ro>
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*
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* $Id: packet-tacacs.c,v 1.23 2002/08/28 21:00:35 jmayer Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* Copied from old packet-tacacs.c
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* rfc-1492 for tacacs and xtacacs
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* draft-grant-tacacs-00.txt for tacacs+ (tacplus)
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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static int proto_tacacs = -1;
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static int hf_tacacs_version = -1;
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static int hf_tacacs_type = -1;
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static int hf_tacacs_nonce = -1;
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static int hf_tacacs_userlen = -1;
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static int hf_tacacs_passlen = -1;
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static int hf_tacacs_response = -1;
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static int hf_tacacs_reason = -1;
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static int hf_tacacs_result1 = -1;
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static int hf_tacacs_destaddr = -1;
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static int hf_tacacs_destport = -1;
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static int hf_tacacs_line = -1;
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static int hf_tacacs_result2 = -1;
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static int hf_tacacs_result3 = -1;
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static gint ett_tacacs = -1;
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#define VERSION_TACACS 0x00
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#define VERSION_XTACACS 0x80
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static const value_string tacacs_version_vals[] = {
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{ VERSION_TACACS, "TACACS" },
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{ VERSION_XTACACS, "XTACACS" },
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{ 0, NULL }
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};
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#define TACACS_LOGIN 1
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#define TACACS_RESPONSE 2
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#define TACACS_CHANGE 3
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#define TACACS_FOLLOW 4
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#define TACACS_CONNECT 5
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#define TACACS_SUPERUSER 6
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#define TACACS_LOGOUT 7
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#define TACACS_RELOAD 8
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#define TACACS_SLIP_ON 9
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#define TACACS_SLIP_OFF 10
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#define TACACS_SLIP_ADDR 11
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static const value_string tacacs_type_vals[] = {
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{ TACACS_LOGIN, "Login" },
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{ TACACS_RESPONSE, "Response" },
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{ TACACS_CHANGE, "Change" },
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{ TACACS_FOLLOW, "Follow" },
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{ TACACS_CONNECT, "Connect" },
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{ TACACS_SUPERUSER, "Superuser" },
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{ TACACS_LOGOUT, "Logout" },
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{ TACACS_RELOAD, "Reload" },
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{ TACACS_SLIP_ON, "SLIP on" },
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{ TACACS_SLIP_OFF, "SLIP off" },
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{ TACACS_SLIP_ADDR, "SLIP Addr" },
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{ 0, NULL }};
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static const value_string tacacs_reason_vals[] = {
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{ 0 , "none" },
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{ 1 , "expiring" },
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{ 2 , "password" },
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{ 3 , "denied" },
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{ 4 , "quit" },
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{ 5 , "idle" },
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{ 6 , "drop" },
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{ 7 , "bad" },
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{ 0 , NULL }
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};
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static const value_string tacacs_resp_vals[] = {
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{ 0 , "this is not a response" },
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{ 1 , "accepted" },
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{ 2 , "rejected" },
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{ 0 , NULL }
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};
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#define TAC_PLUS_AUTHEN 1
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#define TAC_PLUS_AUTHOR 2
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#define TAC_PLUS_ACCT 3
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#define UDP_PORT_TACACS 49
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#define TCP_PORT_TACACS 49
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static void
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dissect_tacacs(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *tacacs_tree;
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proto_item *ti;
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guint8 txt_buff[256],version,type,userlen,passlen;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TACACS");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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version = tvb_get_guint8(tvb,0);
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if (version != 0) {
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "XTACACS");
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}
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type = tvb_get_guint8(tvb,1);
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_str(pinfo->cinfo, COL_INFO,
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val_to_str(type, tacacs_type_vals, "Unknown (0x%02x)"));
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if (tree)
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{
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ti = proto_tree_add_protocol_format(tree, proto_tacacs,
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tvb, 0, -1, version==0?"TACACS":"XTACACS");
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tacacs_tree = proto_item_add_subtree(ti, ett_tacacs);
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proto_tree_add_uint(tacacs_tree, hf_tacacs_version, tvb, 0, 1,
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version);
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proto_tree_add_uint(tacacs_tree, hf_tacacs_type, tvb, 1, 1,
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type);
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proto_tree_add_item(tacacs_tree, hf_tacacs_nonce, tvb, 2, 2,
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FALSE);
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if (version==0)
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{
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if (type!=TACACS_RESPONSE)
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{
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userlen=tvb_get_guint8(tvb,4);
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proto_tree_add_uint(tacacs_tree, hf_tacacs_userlen, tvb, 4, 1,
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userlen);
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passlen=tvb_get_guint8(tvb,5);
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proto_tree_add_uint(tacacs_tree, hf_tacacs_passlen, tvb, 5, 1,
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passlen);
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tvb_get_nstringz0(tvb,6,userlen,txt_buff);
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proto_tree_add_text(tacacs_tree, tvb, 6, userlen, "Username: %s",txt_buff);
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tvb_get_nstringz0(tvb,6+userlen,passlen,txt_buff);
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proto_tree_add_text(tacacs_tree, tvb, 6+userlen, passlen, "Password: %s",txt_buff);
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}
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else
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{
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proto_tree_add_item(tacacs_tree, hf_tacacs_response, tvb, 4, 1,
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FALSE);
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proto_tree_add_item(tacacs_tree, hf_tacacs_reason, tvb, 5, 1,
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FALSE);
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}
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}
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else
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{
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userlen=tvb_get_guint8(tvb,4);
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proto_tree_add_uint(tacacs_tree, hf_tacacs_userlen, tvb, 4, 1,
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userlen);
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passlen=tvb_get_guint8(tvb,5);
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proto_tree_add_uint(tacacs_tree, hf_tacacs_passlen, tvb, 5, 1,
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passlen);
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proto_tree_add_item(tacacs_tree, hf_tacacs_response, tvb, 6, 1,
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FALSE);
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proto_tree_add_item(tacacs_tree, hf_tacacs_reason, tvb, 7, 1,
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FALSE);
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proto_tree_add_item(tacacs_tree, hf_tacacs_result1, tvb, 8, 4,
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FALSE);
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proto_tree_add_item(tacacs_tree, hf_tacacs_destaddr, tvb, 12, 4,
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FALSE);
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proto_tree_add_item(tacacs_tree, hf_tacacs_destport, tvb, 16, 2,
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FALSE);
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proto_tree_add_item(tacacs_tree, hf_tacacs_line, tvb, 18, 2,
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FALSE);
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proto_tree_add_item(tacacs_tree, hf_tacacs_result2, tvb, 20, 4,
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FALSE);
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proto_tree_add_item(tacacs_tree, hf_tacacs_result3, tvb, 24, 2,
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FALSE);
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if (type!=TACACS_RESPONSE)
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{
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tvb_get_nstringz0(tvb,26,userlen,txt_buff);
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proto_tree_add_text(tacacs_tree, tvb, 26, userlen, "Username: %s",txt_buff);
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tvb_get_nstringz0(tvb,26+userlen,passlen,txt_buff);
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proto_tree_add_text(tacacs_tree, tvb, 26+userlen, passlen, "Password; %s",txt_buff);
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}
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}
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}
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}
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void
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proto_register_tacacs(void)
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{
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static hf_register_info hf[] = {
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{ &hf_tacacs_version,
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{ "Version", "tacacs.version",
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FT_UINT8, BASE_HEX, VALS(tacacs_version_vals), 0x0,
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"Version", HFILL }},
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{ &hf_tacacs_type,
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{ "Type", "tacacs.type",
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FT_UINT8, BASE_DEC, VALS(tacacs_type_vals), 0x0,
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"Type", HFILL }},
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{ &hf_tacacs_nonce,
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{ "Nonce", "tacacs.nonce",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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"Nonce", HFILL }},
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{ &hf_tacacs_userlen,
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{ "Username length", "tacacs.userlen",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Username length", HFILL }},
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{ &hf_tacacs_passlen,
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{ "Password length", "tacacs.passlen",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Password length", HFILL }},
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{ &hf_tacacs_response,
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{ "Response", "tacacs.response",
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FT_UINT8, BASE_DEC, VALS(tacacs_resp_vals), 0x0,
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"Response", HFILL }},
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{ &hf_tacacs_reason,
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{ "Reason", "tacacs.reason",
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FT_UINT8, BASE_DEC, VALS(tacacs_reason_vals), 0x0,
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"Reason", HFILL }},
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{ &hf_tacacs_result1,
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{ "Result 1", "tacacs.result1",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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"Result 1", HFILL }},
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{ &hf_tacacs_destaddr,
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{ "Destination address", "tacacs.destaddr",
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FT_IPv4, BASE_NONE, NULL, 0x0,
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"Destination address", HFILL }},
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{ &hf_tacacs_destport,
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{ "Destination port", "tacacs.destport",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Destination port", HFILL }},
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{ &hf_tacacs_line,
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{ "Line", "tacacs.line",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Line", HFILL }},
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{ &hf_tacacs_result2,
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{ "Result 2", "tacacs.result2",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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"Result 2", HFILL }},
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{ &hf_tacacs_result3,
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{ "Result 3", "tacacs.result3",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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"Result 3", HFILL }},
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};
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static gint *ett[] = {
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&ett_tacacs,
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};
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proto_tacacs = proto_register_protocol("TACACS", "TACACS", "tacacs");
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proto_register_field_array(proto_tacacs, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_tacacs(void)
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{
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dissector_handle_t tacacs_handle;
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tacacs_handle = create_dissector_handle(dissect_tacacs, proto_tacacs);
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dissector_add("udp.port", UDP_PORT_TACACS, tacacs_handle);
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}
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static int proto_tacplus = -1;
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static int hf_tacplus_response = -1;
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static int hf_tacplus_request = -1;
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static int hf_tacplus_majvers = -1;
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static int hf_tacplus_minvers = -1;
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static int hf_tacplus_type = -1;
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static int hf_tacplus_seqno = -1;
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static int hf_tacplus_flags = -1;
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static int hf_tacplus_flags_payload_type = -1;
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static int hf_tacplus_flags_connection_type = -1;
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static int hf_tacplus_session_id = -1;
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static int hf_tacplus_packet_len = -1;
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static gint ett_tacplus = -1;
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static gint ett_tacplus_flags = -1;
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static const value_string tacplus_type_vals[] = {
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{ TAC_PLUS_AUTHEN , "Authentication" },
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{ TAC_PLUS_AUTHOR , "Authorization" },
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{ TAC_PLUS_ACCT , "Accounting" },
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{ 0 , NULL }};
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#define FLAGS_UNENCRYPTED 0x01
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static const true_false_string payload_type = {
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"Unencrypted",
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"Encrypted"
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};
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#define FLAGS_SINGLE 0x04
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static const true_false_string connection_type = {
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"Single",
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"Multiple"
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};
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static void
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dissect_tacplus(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *tacplus_tree;
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proto_item *ti;
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guint8 version,flags;
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proto_tree *flags_tree;
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proto_item *tf;
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guint32 len;
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gboolean request=(pinfo->match_port == pinfo->destport);
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TACACS+");
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if (check_col(pinfo->cinfo, COL_INFO))
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{
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col_set_str(pinfo->cinfo, COL_INFO,
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request ? "Request" : "Response");
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}
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if (tree)
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{
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ti = proto_tree_add_protocol_format(tree, proto_tacplus,
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tvb, 0, -1, "TACACS+");
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tacplus_tree = proto_item_add_subtree(ti, ett_tacplus);
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if (pinfo->match_port == pinfo->destport)
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{
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proto_tree_add_boolean_hidden(tacplus_tree,
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hf_tacplus_request, tvb, 0, 0, TRUE);
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}
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else
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{
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proto_tree_add_boolean_hidden(tacplus_tree,
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hf_tacplus_response, tvb, 0, 0, TRUE);
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}
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version = tvb_get_guint8(tvb,0);
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proto_tree_add_uint_format(tacplus_tree, hf_tacplus_majvers, tvb, 0, 1,
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version,
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"Major version: %s",
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(version&0xf0)==0xc0?"TACACS+":"Unknown Version");
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proto_tree_add_uint(tacplus_tree, hf_tacplus_minvers, tvb, 0, 1,
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version&0xf);
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proto_tree_add_item(tacplus_tree, hf_tacplus_type, tvb, 1, 1,
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FALSE);
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proto_tree_add_item(tacplus_tree, hf_tacplus_seqno, tvb, 2, 1,
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FALSE);
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flags = tvb_get_guint8(tvb,3);
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tf = proto_tree_add_uint_format(tacplus_tree, hf_tacplus_flags,
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tvb, 3, 1, flags,
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"Flags: %s, %s (0x%02x)",
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(flags&FLAGS_UNENCRYPTED) ? "Unencrypted payload" :
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"Encrypted payload",
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(flags&FLAGS_SINGLE) ? "Single connection" :
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"Multiple Connections",
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flags);
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flags_tree = proto_item_add_subtree(tf, ett_tacplus_flags);
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proto_tree_add_boolean(flags_tree, hf_tacplus_flags_payload_type,
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tvb, 3, 1, flags);
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proto_tree_add_boolean(flags_tree, hf_tacplus_flags_connection_type,
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tvb, 3, 1, flags);
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proto_tree_add_item(tacplus_tree, hf_tacplus_session_id, tvb, 4, 4,
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FALSE);
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len = tvb_get_ntohl(tvb,8);
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proto_tree_add_uint(tacplus_tree, hf_tacplus_packet_len, tvb, 8, 4,
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len);
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if (flags&FLAGS_UNENCRYPTED)
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proto_tree_add_text(tacplus_tree, tvb, 12, len, "Payload");
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else
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proto_tree_add_text(tacplus_tree, tvb, 12, len, "Encrypted payload");
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}
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}
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void
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proto_register_tacplus(void)
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{
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static hf_register_info hf[] = {
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{ &hf_tacplus_response,
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{ "Response", "tacplus.response",
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FT_BOOLEAN, BASE_NONE, NULL, 0x0,
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"TRUE if TACACS+ response", HFILL }},
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{ &hf_tacplus_request,
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{ "Request", "tacplus.request",
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FT_BOOLEAN, BASE_NONE, NULL, 0x0,
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"TRUE if TACACS+ request", HFILL }},
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{ &hf_tacplus_majvers,
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{ "Major version", "tacplus.majvers",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Major version number", HFILL }},
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{ &hf_tacplus_minvers,
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{ "Minor version", "tacplus.minvers",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Minor version number", HFILL }},
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{ &hf_tacplus_type,
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{ "Type", "tacplus.type",
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FT_UINT8, BASE_DEC, VALS(tacplus_type_vals), 0x0,
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"Type", HFILL }},
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{ &hf_tacplus_seqno,
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{ "Sequence number", "tacplus.seqno",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Sequence number", HFILL }},
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{ &hf_tacplus_flags,
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{ "Flags", "tacplus.flags",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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"Flags", HFILL }},
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{ &hf_tacplus_flags_payload_type,
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{ "Payload type", "tacplus.flags.payload_type",
|
|
FT_BOOLEAN, 8, TFS(&payload_type), FLAGS_UNENCRYPTED,
|
|
"Payload type (unencrypted or encrypted)", HFILL }},
|
|
{ &hf_tacplus_flags_connection_type,
|
|
{ "Connection type", "tacplus.flags.connection_type",
|
|
FT_BOOLEAN, 8, TFS(&connection_type), FLAGS_SINGLE,
|
|
"Connection type (single or multiple)", HFILL }},
|
|
{ &hf_tacplus_session_id,
|
|
{ "Session ID", "tacplus.session_id",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Session ID", HFILL }},
|
|
{ &hf_tacplus_packet_len,
|
|
{ "Packet length", "tacplus.packet_len",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Packet length", HFILL }}
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_tacplus,
|
|
&ett_tacplus_flags,
|
|
};
|
|
proto_tacplus = proto_register_protocol("TACACS+", "TACACS+", "tacplus");
|
|
proto_register_field_array(proto_tacplus, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_tacplus(void)
|
|
{
|
|
dissector_handle_t tacplus_handle;
|
|
|
|
tacplus_handle = create_dissector_handle(dissect_tacplus,
|
|
proto_tacplus);
|
|
dissector_add("tcp.port", TCP_PORT_TACACS, tacplus_handle);
|
|
}
|