diff options
author | Gilbert Ramirez <gram@alumni.rice.edu> | 2004-07-18 18:06:47 +0000 |
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committer | Gilbert Ramirez <gram@alumni.rice.edu> | 2004-07-18 18:06:47 +0000 |
commit | 669db206cb1f270046ad400fff7655e20c63e723 (patch) | |
tree | 4eff24a2e16c8963e497e1fc575f35e6af59bd26 /epan/dissectors/packet-tacacs.c | |
parent | ae46c27a38700af669ef907491081f09df6f6b2c (diff) |
Move dissectors to epan/dissectors directory.
Also move ncp222.py, x11-fields, process-x11-fields.pl,
make-reg-dotc, and make-reg-dotc.py.
Adjust #include lines in files that include packet-*.h
files.
svn path=/trunk/; revision=11410
Diffstat (limited to 'epan/dissectors/packet-tacacs.c')
-rw-r--r-- | epan/dissectors/packet-tacacs.c | 1137 |
1 files changed, 1137 insertions, 0 deletions
diff --git a/epan/dissectors/packet-tacacs.c b/epan/dissectors/packet-tacacs.c new file mode 100644 index 0000000000..8968beb5a5 --- /dev/null +++ b/epan/dissectors/packet-tacacs.c @@ -0,0 +1,1137 @@ +/* packet-tacacs.c + * Routines for cisco tacacs/xtacacs/tacacs+ packet dissection + * Copyright 2001, Paul Ionescu <paul@acorp.ro> + * + * Full Tacacs+ parsing with decryption by + * Emanuele Caratti <wiz@iol.it> + * + * $Id$ + * + * 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-02.txt for tacacs+ (tacplus) + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <stdio.h> + +#include <string.h> +#include <glib.h> +#include <epan/packet.h> + +#include "prefs.h" +#include "crypt-md5.h" +#include "packet-tacacs.h" + +static void md5_xor( guint8 *data, char *key, int data_len, guint8 *session_id, guint8 version, guint8 seq_no ); + +static int proto_tacacs = -1; +static int hf_tacacs_version = -1; +static int hf_tacacs_type = -1; +static int hf_tacacs_nonce = -1; +static int hf_tacacs_userlen = -1; +static int hf_tacacs_passlen = -1; +static int hf_tacacs_response = -1; +static int hf_tacacs_reason = -1; +static int hf_tacacs_result1 = -1; +static int hf_tacacs_destaddr = -1; +static int hf_tacacs_destport = -1; +static int hf_tacacs_line = -1; +static int hf_tacacs_result2 = -1; +static int hf_tacacs_result3 = -1; + +static gint ett_tacacs = -1; + +static char *tacplus_opt_key; +static GSList *tacplus_keys = NULL; + +#define VERSION_TACACS 0x00 +#define VERSION_XTACACS 0x80 + +static const value_string tacacs_version_vals[] = { + { VERSION_TACACS, "TACACS" }, + { VERSION_XTACACS, "XTACACS" }, + { 0, NULL } +}; + +#define TACACS_LOGIN 1 +#define TACACS_RESPONSE 2 +#define TACACS_CHANGE 3 +#define TACACS_FOLLOW 4 +#define TACACS_CONNECT 5 +#define TACACS_SUPERUSER 6 +#define TACACS_LOGOUT 7 +#define TACACS_RELOAD 8 +#define TACACS_SLIP_ON 9 +#define TACACS_SLIP_OFF 10 +#define TACACS_SLIP_ADDR 11 +static const value_string tacacs_type_vals[] = { + { TACACS_LOGIN, "Login" }, + { TACACS_RESPONSE, "Response" }, + { TACACS_CHANGE, "Change" }, + { TACACS_FOLLOW, "Follow" }, + { TACACS_CONNECT, "Connect" }, + { TACACS_SUPERUSER, "Superuser" }, + { TACACS_LOGOUT, "Logout" }, + { TACACS_RELOAD, "Reload" }, + { TACACS_SLIP_ON, "SLIP on" }, + { TACACS_SLIP_OFF, "SLIP off" }, + { TACACS_SLIP_ADDR, "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" }, + { 0 , NULL } +}; + +static const value_string tacacs_resp_vals[] = { + { 0 , "this is not a response" }, + { 1 , "accepted" }, + { 2 , "rejected" }, + { 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; + proto_item *ti; + guint8 txt_buff[255+1],version,type,userlen,passlen; + + if (check_col(pinfo->cinfo, COL_PROTOCOL)) + col_set_str(pinfo->cinfo, COL_PROTOCOL, "TACACS"); + if (check_col(pinfo->cinfo, COL_INFO)) + col_clear(pinfo->cinfo, COL_INFO); + + version = tvb_get_guint8(tvb,0); + if (version != 0) { + if (check_col(pinfo->cinfo, COL_PROTOCOL)) + col_set_str(pinfo->cinfo, COL_PROTOCOL, "XTACACS"); + } + + type = tvb_get_guint8(tvb,1); + if (check_col(pinfo->cinfo, COL_INFO)) + col_add_str(pinfo->cinfo, COL_INFO, + val_to_str(type, tacacs_type_vals, "Unknown (0x%02x)")); + + if (tree) + { + ti = proto_tree_add_protocol_format(tree, proto_tacacs, + tvb, 0, -1, version==0?"TACACS":"XTACACS"); + tacacs_tree = proto_item_add_subtree(ti, ett_tacacs); + + proto_tree_add_uint(tacacs_tree, hf_tacacs_version, tvb, 0, 1, + version); + proto_tree_add_uint(tacacs_tree, hf_tacacs_type, tvb, 1, 1, + type); + proto_tree_add_item(tacacs_tree, hf_tacacs_nonce, tvb, 2, 2, + FALSE); + + if (version==0) + { + if (type!=TACACS_RESPONSE) + { + userlen=tvb_get_guint8(tvb,4); + proto_tree_add_uint(tacacs_tree, hf_tacacs_userlen, tvb, 4, 1, + userlen); + passlen=tvb_get_guint8(tvb,5); + proto_tree_add_uint(tacacs_tree, hf_tacacs_passlen, tvb, 5, 1, + passlen); + tvb_get_nstringz0(tvb,6,userlen+1,txt_buff); + proto_tree_add_text(tacacs_tree, tvb, 6, userlen, "Username: %s",txt_buff); + tvb_get_nstringz0(tvb,6+userlen,passlen+1,txt_buff); + proto_tree_add_text(tacacs_tree, tvb, 6+userlen, passlen, "Password: %s",txt_buff); + } + else + { + proto_tree_add_item(tacacs_tree, hf_tacacs_response, tvb, 4, 1, + FALSE); + proto_tree_add_item(tacacs_tree, hf_tacacs_reason, tvb, 5, 1, + FALSE); + } + } + else + { + userlen=tvb_get_guint8(tvb,4); + proto_tree_add_uint(tacacs_tree, hf_tacacs_userlen, tvb, 4, 1, + userlen); + passlen=tvb_get_guint8(tvb,5); + proto_tree_add_uint(tacacs_tree, hf_tacacs_passlen, tvb, 5, 1, + passlen); + proto_tree_add_item(tacacs_tree, hf_tacacs_response, tvb, 6, 1, + FALSE); + proto_tree_add_item(tacacs_tree, hf_tacacs_reason, tvb, 7, 1, + FALSE); + proto_tree_add_item(tacacs_tree, hf_tacacs_result1, tvb, 8, 4, + FALSE); + proto_tree_add_item(tacacs_tree, hf_tacacs_destaddr, tvb, 12, 4, + FALSE); + proto_tree_add_item(tacacs_tree, hf_tacacs_destport, tvb, 16, 2, + FALSE); + proto_tree_add_item(tacacs_tree, hf_tacacs_line, tvb, 18, 2, + FALSE); + proto_tree_add_item(tacacs_tree, hf_tacacs_result2, tvb, 20, 4, + FALSE); + proto_tree_add_item(tacacs_tree, hf_tacacs_result3, tvb, 24, 2, + FALSE); + if (type!=TACACS_RESPONSE) + { + tvb_get_nstringz0(tvb,26,userlen+1,txt_buff); + proto_tree_add_text(tacacs_tree, tvb, 26, userlen, "Username: %s",txt_buff); + tvb_get_nstringz0(tvb,26+userlen,passlen+1,txt_buff); + proto_tree_add_text(tacacs_tree, tvb, 26+userlen, passlen, "Password; %s",txt_buff); + } + } + } +} + +void +proto_register_tacacs(void) +{ + static hf_register_info hf[] = { + { &hf_tacacs_version, + { "Version", "tacacs.version", + FT_UINT8, BASE_HEX, VALS(tacacs_version_vals), 0x0, + "Version", HFILL }}, + { &hf_tacacs_type, + { "Type", "tacacs.type", + FT_UINT8, BASE_DEC, VALS(tacacs_type_vals), 0x0, + "Type", HFILL }}, + { &hf_tacacs_nonce, + { "Nonce", "tacacs.nonce", + FT_UINT16, BASE_HEX, NULL, 0x0, + "Nonce", HFILL }}, + { &hf_tacacs_userlen, + { "Username length", "tacacs.userlen", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Username length", HFILL }}, + { &hf_tacacs_passlen, + { "Password length", "tacacs.passlen", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Password length", HFILL }}, + { &hf_tacacs_response, + { "Response", "tacacs.response", + FT_UINT8, BASE_DEC, VALS(tacacs_resp_vals), 0x0, + "Response", HFILL }}, + { &hf_tacacs_reason, + { "Reason", "tacacs.reason", + FT_UINT8, BASE_DEC, VALS(tacacs_reason_vals), 0x0, + "Reason", HFILL }}, + { &hf_tacacs_result1, + { "Result 1", "tacacs.result1", + FT_UINT32, BASE_HEX, NULL, 0x0, + "Result 1", HFILL }}, + { &hf_tacacs_destaddr, + { "Destination address", "tacacs.destaddr", + FT_IPv4, BASE_NONE, NULL, 0x0, + "Destination address", HFILL }}, + { &hf_tacacs_destport, + { "Destination port", "tacacs.destport", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Destination port", HFILL }}, + { &hf_tacacs_line, + { "Line", "tacacs.line", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Line", HFILL }}, + { &hf_tacacs_result2, + { "Result 2", "tacacs.result2", + FT_UINT32, BASE_HEX, NULL, 0x0, + "Result 2", HFILL }}, + { &hf_tacacs_result3, + { "Result 3", "tacacs.result3", + FT_UINT16, BASE_HEX, NULL, 0x0, + "Result 3", HFILL }}, + }; + + static gint *ett[] = { + &ett_tacacs, + }; + proto_tacacs = proto_register_protocol("TACACS", "TACACS", "tacacs"); + proto_register_field_array(proto_tacacs, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); +} + +void +proto_reg_handoff_tacacs(void) +{ + dissector_handle_t tacacs_handle; + + tacacs_handle = create_dissector_handle(dissect_tacacs, proto_tacacs); + dissector_add("udp.port", UDP_PORT_TACACS, tacacs_handle); +} + +static int proto_tacplus = -1; +static int hf_tacplus_response = -1; +static int hf_tacplus_request = -1; +static int hf_tacplus_majvers = -1; +static int hf_tacplus_minvers = -1; +static int hf_tacplus_type = -1; +static int hf_tacplus_seqno = -1; +static int hf_tacplus_flags = -1; +static int hf_tacplus_flags_payload_type = -1; +static int hf_tacplus_flags_connection_type = -1; +static int hf_tacplus_acct_flags = -1; +static int hf_tacplus_session_id = -1; +static int hf_tacplus_packet_len = -1; + +static gint ett_tacplus = -1; +static gint ett_tacplus_body = -1; +static gint ett_tacplus_body_chap = -1; +static gint ett_tacplus_flags = -1; +static gint ett_tacplus_acct_flags = -1; + +typedef struct _tacplus_key_entry { + address *s; /* Server address */ + address *c; /* client address */ + char *k; /* Key */ +} tacplus_key_entry; + +static gint +tacplus_decrypted_tvb_setup( tvbuff_t *tvb, tvbuff_t **dst_tvb, packet_info *pinfo, guint32 len, guint8 version, char *key ) +{ + guint8 *buff; + guint8 session_id[4]; + + /* TODO Check the possibility to use pinfo->decrypted_data */ +/* session_id is in NETWORK Byte Order, and is used as byte array in the md5_xor */ + + tvb_memcpy(tvb, (guint8*)session_id, 4,4); + + buff = tvb_memdup(tvb, TAC_PLUS_HDR_SIZE, len); + + + md5_xor( buff, key, len, session_id,version, tvb_get_guint8(tvb,2) ); + + /* Allocate a new tvbuff, referring to the decrypted data. */ + *dst_tvb = tvb_new_real_data( buff, len, len ); + + /* Arrange that the allocated packet data copy be freed when the + tvbuff is freed. */ + tvb_set_free_cb( *dst_tvb, g_free ); + + /* Add the tvbuff to the list of tvbuffs to which the tvbuff we + were handed refers, so it'll get cleaned up when that tvbuff + is cleaned up. */ + tvb_set_child_real_data_tvbuff( tvb, *dst_tvb ); + + /* Add the decrypted data to the data source list. */ + add_new_data_source(pinfo, *dst_tvb, "TACACS+ Decrypted"); + + return 0; +} +static void +dissect_tacplus_args_list( tvbuff_t *tvb, proto_tree *tree, int data_off, int len_off, int arg_cnt ) +{ + int i; + guint8 buff[257]; + for(i=0;i<arg_cnt;i++){ + int len=tvb_get_guint8(tvb,len_off+i); + proto_tree_add_text( tree, tvb, len_off+i, 1, "Arg[%d] length: %d", i, len ); + tvb_get_nstringz0(tvb, data_off, len+1, buff); + proto_tree_add_text( tree, tvb, data_off, len, "Arg[%d] value: %s", i, buff ); + data_off+=len; + } +} + + +static int +proto_tree_add_tacplus_common_fields( tvbuff_t *tvb, proto_tree *tree, int offset, int var_off ) +{ + int val; + guint8 buff[257]; + /* priv_lvl */ + proto_tree_add_text( tree, tvb, offset, 1, + "Privilege Level: %d", tvb_get_guint8(tvb,offset) ); + offset++; + + /* authen_type */ + val=tvb_get_guint8(tvb,offset); + proto_tree_add_text( tree, tvb, offset, 1, + "Authentication type: %s", + val_to_str( val, tacplus_authen_type_vals, "Unknown Packet" ) ); + offset++; + + /* service */ + val=tvb_get_guint8(tvb,offset); + proto_tree_add_text( tree, tvb, offset, 1, + "Service: %s", + val_to_str( val, tacplus_authen_service_vals, "Unknown Packet" ) ); + offset++; + + /* user_len && user */ + val=tvb_get_guint8(tvb,offset); + proto_tree_add_text( tree, tvb, offset, 1, "User len: %d", val ); + if( val ){ + tvb_get_nstringz0(tvb, var_off, val+1, buff); + proto_tree_add_text( tree, tvb, var_off, val, "User: %s", buff ); + var_off+=val; + } + offset++; + + + /* port_len && port */ + val=tvb_get_guint8(tvb,offset); + proto_tree_add_text( tree, tvb, offset, 1, "Port len: %d", val ); + if( val ){ + tvb_get_nstringz0(tvb, var_off, val+1, buff); + proto_tree_add_text( tree, tvb, var_off, val, "Port: %s", buff ); + var_off+=val; + } + offset++; + + /* rem_addr_len && rem_addr */ + val=tvb_get_guint8(tvb,offset); + proto_tree_add_text( tree, tvb, offset, 1, "Remaddr len: %d", val ); + if( val ){ + tvb_get_nstringz0(tvb, var_off, val+1, buff); + proto_tree_add_text( tree, tvb, var_off, val, "Remote Address: %s", buff ); + var_off+=val; + } + return var_off; +} + +static void +dissect_tacplus_body_authen_req_login( tvbuff_t* tvb, proto_tree *tree, int var_off ) +{ + guint8 buff[257]; + guint8 val; + val=tvb_get_guint8( tvb, AUTHEN_S_DATA_LEN_OFF ); + + switch ( tvb_get_guint8(tvb, AUTHEN_S_AUTHEN_TYPE_OFF ) ) { /* authen_type */ + + case TAC_PLUS_AUTHEN_TYPE_ASCII: + proto_tree_add_text( tree, tvb, AUTHEN_S_DATA_LEN_OFF, 1, "Data: %d (not used)", val ); + if( val ) + proto_tree_add_text( tree, tvb, var_off, val, "Data" ); + break; + + case TAC_PLUS_AUTHEN_TYPE_PAP: + proto_tree_add_text( tree, tvb, AUTHEN_S_DATA_LEN_OFF, 1, "Password Length %d", val ); + if( val ) { + tvb_get_nstringz0( tvb, var_off, val+1, buff ); + proto_tree_add_text( tree, tvb, var_off, val, "Password: %s", buff ); + } + break; + + case TAC_PLUS_AUTHEN_TYPE_CHAP: + proto_tree_add_text( tree, tvb, AUTHEN_S_DATA_LEN_OFF, 1, "CHAP Data Length %d", val ); + if( val ) { + proto_item *pi; + proto_tree *pt; + guint8 chal_len=val-(1+16); /* Response field alwayes 16 octets */ + pi = proto_tree_add_text(tree, tvb, var_off, val, "CHAP Data" ); + pt = proto_item_add_subtree( pi, ett_tacplus_body_chap ); + val= tvb_get_guint8( tvb, var_off ); + proto_tree_add_text( pt, tvb, var_off, 1, "ID: %d", val ); + var_off++; + tvb_get_nstringz0( tvb, var_off, chal_len+1, buff ); + proto_tree_add_text( pt, tvb, var_off, chal_len, "Challenge: %s", buff ); + var_off+=chal_len; + tvb_get_nstringz0( tvb, var_off, 16+1, buff ); + proto_tree_add_text( pt, tvb, var_off, 16 , "Response: %s", buff ); + } + break; + case TAC_PLUS_AUTHEN_TYPE_MSCHAP: + proto_tree_add_text( tree, tvb, AUTHEN_S_DATA_LEN_OFF, 1, "MSCHAP Data Length %d", val ); + if( val ) { + proto_item *pi; + proto_tree *pt; + guint8 chal_len=val-(1+49); /* Response field alwayes 49 octets */ + pi = proto_tree_add_text(tree, tvb, var_off, val, "MSCHAP Data" ); + pt = proto_item_add_subtree( pi, ett_tacplus_body_chap ); + val= tvb_get_guint8( tvb, var_off ); + proto_tree_add_text( pt, tvb, var_off, 1, "ID: %d", val ); + var_off++; + tvb_get_nstringz0( tvb, var_off, chal_len+1, buff ); + proto_tree_add_text( pt, tvb, var_off, chal_len, "Challenge: %s", buff ); + var_off+=chal_len; + tvb_get_nstringz0( tvb, var_off, 49+1, buff ); + proto_tree_add_text( pt, tvb, var_off, 49 , "Response: %s", buff ); + } + break; + case TAC_PLUS_AUTHEN_TYPE_ARAP: + proto_tree_add_text( tree, tvb, AUTHEN_S_DATA_LEN_OFF, 1, "ARAP Data Length %d", val ); + if( val ) { + proto_item *pi; + proto_tree *pt; + pi = proto_tree_add_text(tree, tvb, var_off, val, "ARAP Data" ); + pt = proto_item_add_subtree( pi, ett_tacplus_body_chap ); + + tvb_get_nstringz0( tvb, var_off, 8+1, buff ); + proto_tree_add_text( pt, tvb, var_off, 8, "Nas Challenge: %s", buff ); + var_off+=8; + tvb_get_nstringz0( tvb, var_off, 8+1, buff ); + proto_tree_add_text( pt, tvb, var_off, 8, "Remote Challenge: %s", buff ); + var_off+=8; + tvb_get_nstringz0( tvb, var_off, 8+1, buff ); + proto_tree_add_text( pt, tvb, var_off, 8, "Remote Response: %s", buff ); + var_off+=8; + } + break; + + default: /* Should not be reached */ + proto_tree_add_text( tree, tvb, AUTHEN_S_DATA_LEN_OFF, 1, "Data: %d", val ); + if( val ){ + proto_tree_add_text( tree, tvb, var_off, val, "Data" ); + } + } +} + +static void +dissect_tacplus_body_authen_req( tvbuff_t* tvb, proto_tree *tree ) +{ + guint8 val; + int var_off=AUTHEN_S_VARDATA_OFF; + + /* Action */ + val=tvb_get_guint8( tvb, AUTHEN_S_ACTION_OFF ); + proto_tree_add_text( tree, tvb, + AUTHEN_S_ACTION_OFF, 1, + "Action: %s", + val_to_str( val, tacplus_authen_action_vals, "Unknown Packet" ) ); + + var_off=proto_tree_add_tacplus_common_fields( tvb, tree , AUTHEN_S_PRIV_LVL_OFF, AUTHEN_S_VARDATA_OFF ); + + switch( val ) { + case TAC_PLUS_AUTHEN_LOGIN: + dissect_tacplus_body_authen_req_login( tvb, tree, var_off ); + break; + case TAC_PLUS_AUTHEN_SENDAUTH: + break; + } +} + +static void +dissect_tacplus_body_authen_req_cont( tvbuff_t *tvb, proto_tree *tree ) +{ + int val; + int var_off=AUTHEN_C_VARDATA_OFF; + guint8 *buff=NULL; + + val=tvb_get_guint8( tvb, AUTHEN_C_FLAGS_OFF ); + proto_tree_add_text( tree, tvb, + AUTHEN_R_FLAGS_OFF, 1, "Flags: 0x%02x %s", + val, + (val&TAC_PLUS_CONTINUE_FLAG_ABORT?"(Abort)":"") ); + + + val=tvb_get_ntohs( tvb, AUTHEN_C_USER_LEN_OFF ); + proto_tree_add_text( tree, tvb, AUTHEN_C_USER_LEN_OFF, 2 , "User length: %d", val ); + if( val ){ + buff=tvb_get_string( tvb, var_off, val ); + proto_tree_add_text( tree, tvb, var_off, val, "User: %s", buff ); + var_off+=val; + g_free(buff); + } + + val=tvb_get_ntohs( tvb, AUTHEN_C_DATA_LEN_OFF ); + proto_tree_add_text( tree, tvb, AUTHEN_C_DATA_LEN_OFF, 2 , + "Data length: %d", val ); + if( val ){ + proto_tree_add_text( tree, tvb, var_off, val, "Data" ); + } + +} + +/* Server REPLY */ +static void +dissect_tacplus_body_authen_rep( tvbuff_t *tvb, proto_tree *tree ) +{ + int val; + int var_off=AUTHEN_R_VARDATA_OFF; + guint8 *buff=NULL; + + val=tvb_get_guint8( tvb, AUTHEN_R_STATUS_OFF ); + proto_tree_add_text(tree, tvb, + AUTHEN_R_STATUS_OFF, 1, "Status: 0x%01x (%s)", val, + val_to_str( val, tacplus_reply_status_vals, "Unknown Packet" ) ); + + val=tvb_get_guint8( tvb, AUTHEN_R_FLAGS_OFF ); + proto_tree_add_text(tree, tvb, + AUTHEN_R_FLAGS_OFF, 1, "Flags: 0x%02x %s", + val, (val&TAC_PLUS_REPLY_FLAG_NOECHO?"(NoEcho)":"") ); + + + val=tvb_get_ntohs(tvb, AUTHEN_R_SRV_MSG_LEN_OFF ); + proto_tree_add_text( tree, tvb, AUTHEN_R_SRV_MSG_LEN_OFF, 2 , + "Server message length: %d", val ); + if( val ) { + buff=tvb_get_string(tvb, var_off, val ); + proto_tree_add_text(tree, tvb, var_off, val, "Server message: %s", buff ); + var_off+=val; + g_free(buff); + } + + val=tvb_get_ntohs(tvb, AUTHEN_R_DATA_LEN_OFF ); + proto_tree_add_text( tree, tvb, AUTHEN_R_DATA_LEN_OFF, 2 , + "Data length: %d", val ); + if( val ){ + proto_tree_add_text(tree, tvb, var_off, val, "Data" ); + } +} + +static void +dissect_tacplus_body_author_req( tvbuff_t* tvb, proto_tree *tree ) +{ + int val; + int var_off; + + val=tvb_get_guint8( tvb, AUTHOR_Q_AUTH_METH_OFF ) ; + proto_tree_add_text( tree, tvb, AUTHOR_Q_AUTH_METH_OFF, 1, + "Auth Method: %s", val_to_str( val, tacplus_authen_method, "Unknown Authen Method" ) ); + + val=tvb_get_guint8( tvb, AUTHOR_Q_ARGC_OFF ); + var_off=proto_tree_add_tacplus_common_fields( tvb, tree , + AUTHOR_Q_PRIV_LVL_OFF, + AUTHOR_Q_VARDATA_OFF + val ); + + proto_tree_add_text( tree, tvb, AUTHOR_Q_ARGC_OFF, 1, "Arg count: %d", val ); + +/* var_off points after rem_addr */ + + dissect_tacplus_args_list( tvb, tree, var_off, AUTHOR_Q_VARDATA_OFF, val ); +} + +static void +dissect_tacplus_body_author_rep( tvbuff_t* tvb, proto_tree *tree ) +{ + int offset=AUTHOR_R_VARDATA_OFF; + int val=tvb_get_guint8( tvb, AUTHOR_R_STATUS_OFF ) ; + + + proto_tree_add_text( tree, tvb, AUTHOR_R_STATUS_OFF , 1, + "Auth Status: 0x%01x (%s)", val, + val_to_str( val, tacplus_author_status, "Unknown Authorization Status" )); + + val=tvb_get_ntohs( tvb, AUTHOR_R_SRV_MSG_LEN_OFF ); + offset+=val; + proto_tree_add_text( tree, tvb, AUTHOR_R_SRV_MSG_LEN_OFF, 2, "Server Msg length: %d", val ); + + val=tvb_get_ntohs( tvb, AUTHOR_R_DATA_LEN_OFF ); + offset+=val; + proto_tree_add_text( tree, tvb, AUTHOR_R_DATA_LEN_OFF, 2, "Data length: %d", val ); + + val=tvb_get_guint8( tvb, AUTHOR_R_ARGC_OFF); + offset+=val; + proto_tree_add_text( tree, tvb, AUTHOR_R_ARGC_OFF, 1, "Arg count: %d", val ); + + dissect_tacplus_args_list( tvb, tree, offset, AUTHOR_R_VARDATA_OFF, val ); +} + +static void +dissect_tacplus_body_acct_req( tvbuff_t* tvb, proto_tree *tree ) +{ + int val, var_off; + + proto_item *tf; + proto_tree *flags_tree; + + val=tvb_get_guint8( tvb, ACCT_Q_FLAGS_OFF ); + tf = proto_tree_add_uint( tree, hf_tacplus_acct_flags, tvb, ACCT_Q_FLAGS_OFF, 1, val ); + + flags_tree = proto_item_add_subtree( tf, ett_tacplus_acct_flags ); + proto_tree_add_text( flags_tree, tvb, ACCT_Q_FLAGS_OFF, 1, "%s", + decode_boolean_bitfield( val, TAC_PLUS_ACCT_FLAG_MORE, 8, + "More: Set", "More: Not set" ) ); + proto_tree_add_text( flags_tree, tvb, ACCT_Q_FLAGS_OFF, 1, "%s", + decode_boolean_bitfield( val, TAC_PLUS_ACCT_FLAG_START, 8, + "Start: Set", "Start: Not set" ) ); + proto_tree_add_text( flags_tree, tvb, ACCT_Q_FLAGS_OFF, 1, "%s", + decode_boolean_bitfield( val, TAC_PLUS_ACCT_FLAG_STOP, 8, + "Stop: Set", "Stop: Not set" ) ); + proto_tree_add_text( flags_tree, tvb, ACCT_Q_FLAGS_OFF, 1, "%s", + decode_boolean_bitfield( val, TAC_PLUS_ACCT_FLAG_WATCHDOG, 8, + "Watchdog: Set", "Watchdog: Not set" ) ); + + val=tvb_get_guint8( tvb, ACCT_Q_METHOD_OFF ); + proto_tree_add_text( tree, tvb, ACCT_Q_METHOD_OFF, 1, + "Authen Method: 0x%01x (%s)", + val, val_to_str( val, tacplus_authen_method, "Unknown Authen Method" ) ); + + val=tvb_get_guint8( tvb, ACCT_Q_ARG_CNT_OFF ); + + /* authen_type */ + var_off=proto_tree_add_tacplus_common_fields( tvb, tree , + ACCT_Q_PRIV_LVL_OFF, + ACCT_Q_VARDATA_OFF+val + ); + + proto_tree_add_text( tree, tvb, ACCT_Q_ARG_CNT_OFF, 1, + "Arg Cnt: %d", val ); + + dissect_tacplus_args_list( tvb, tree, var_off, ACCT_Q_VARDATA_OFF, val ); + + +} + +static void +dissect_tacplus_body_acct_rep( tvbuff_t* tvb, proto_tree *tree ) +{ + int val, var_off=ACCT_Q_VARDATA_OFF; + + guint8 *buff=NULL; + + /* Status */ + val=tvb_get_guint8( tvb, ACCT_R_STATUS_OFF ); + proto_tree_add_text( tree, tvb, ACCT_R_STATUS_OFF, 1, "Status: 0x%02x (%s)", val, + val_to_str( val, tacplus_acct_status, "Bogus status..") ); + + /* Server Message */ + val=tvb_get_ntohs( tvb, ACCT_R_SRV_MSG_LEN_OFF ); + proto_tree_add_text( tree, tvb, ACCT_R_SRV_MSG_LEN_OFF, 2 , + "Server message length: %d", val ); + if( val ) { + buff=tvb_get_string( tvb, var_off, val ); + proto_tree_add_text( tree, tvb, var_off, + val, "Server message: %s", buff ); + var_off+=val; + g_free(buff); + } + + /* Data */ + val=tvb_get_ntohs( tvb, ACCT_R_DATA_LEN_OFF ); + proto_tree_add_text( tree, tvb, ACCT_R_DATA_LEN_OFF, 2 , + "Data length: %d", val ); + if( val ) { + buff= tvb_get_string( tvb, var_off, val ); + proto_tree_add_text( tree, tvb, var_off, + val, "Data: %s", buff ); + g_free(buff); + } +} + + + +static void +dissect_tacplus_body(tvbuff_t * hdr_tvb, tvbuff_t * tvb, proto_tree * tree ) +{ + int type = tvb_get_guint8( hdr_tvb, H_TYPE_OFF ); + int seq_no = tvb_get_guint8( hdr_tvb, H_SEQ_NO_OFF ); + + switch (type) { + case TAC_PLUS_AUTHEN: + if ( seq_no & 0x01) { + if ( seq_no == 1 ) + dissect_tacplus_body_authen_req( tvb, tree ); + else + dissect_tacplus_body_authen_req_cont( tvb, tree ); + } else { + dissect_tacplus_body_authen_rep( tvb, tree ); + } + return; + break; + case TAC_PLUS_AUTHOR: + if ( seq_no & 0x01) + dissect_tacplus_body_author_req( tvb, tree ); + else + dissect_tacplus_body_author_rep( tvb, tree ); + return; + break; + case TAC_PLUS_ACCT: + if ( seq_no & 0x01) + dissect_tacplus_body_acct_req( tvb, tree ); + else + dissect_tacplus_body_acct_rep( tvb, tree ); + return; + break; + } + proto_tree_add_text( tree, tvb, 0, tvb_length( tvb ), "Bogus.."); +} + +#ifdef DEB_TACPLUS +static void +tacplus_print_key_entry( gpointer data, gpointer user_data ) +{ + tacplus_key_entry *tacplus_data=(tacplus_key_entry *)data; + if( user_data ) { + printf("%s:%s=%s\n", address_to_str( tacplus_data->s ), + address_to_str( tacplus_data->c ), tacplus_data->k ); + } else { + printf("%s:%s\n", address_to_str( tacplus_data->s ), + address_to_str( tacplus_data->c ) ); + } +} +#endif +static int +cmp_conv_address( gconstpointer p1, gconstpointer p2 ) +{ + tacplus_key_entry *a1=(tacplus_key_entry*)p1; + tacplus_key_entry *a2=(tacplus_key_entry*)p2; + gint32 ret; + /* + printf("p1=>"); + tacplus_print_key_entry( p1, NULL ); + printf("p2=>"); + tacplus_print_key_entry( p2, NULL ); + */ + ret=CMP_ADDRESS( a1->s, a2->s ); + if( !ret ) { + ret=CMP_ADDRESS( a1->c, a2->c ); + /* + if(ret) + printf("No Client found!"); */ + } else { + /* printf("No Server found!"); */ + } + return ret; +} + +static char* +find_key( address *srv, address *cln ) +{ + tacplus_key_entry data; + GSList *match; + + data.s=srv; + data.c=cln; +/* printf("Looking for: "); + tacplus_print_key_entry( (gconstpointer)&data, NULL ); */ + match=g_slist_find_custom( tacplus_keys, (gpointer)&data, cmp_conv_address ); +/* printf("Finished (%p)\n", match); */ + if( match ) + return ((tacplus_key_entry*)match->data)->k; + + return (tacplus_keys?NULL:tacplus_opt_key); +} +#define AF_INET 2 +int inet_pton(int , const char*, void*); + +static void +mkipv4_address( address **addr, char *str_addr ) +{ + *addr=g_malloc( sizeof(address) ); + (*addr)->type=AT_IPv4; + (*addr)->len=4; + (*addr)->data=g_malloc( 4 ); + inet_pton( AF_INET, (const char*)str_addr, (void*)(*addr)->data ); +} +static void +parse_tuple( char *key_from_option ) +{ + char *client,*key; + tacplus_key_entry *tacplus_data=g_malloc( sizeof(tacplus_key_entry) ); + /* + printf("keys: %s\n", key_from_option ); + */ + client=strchr(key_from_option,'/'); + if(!client) + return; + *client++='\0'; + key=strchr(client,'='); + if(!key) + return; + *key++='\0'; + /* + printf("%s %s => %s\n", key_from_option, client, key ); + */ + mkipv4_address( &tacplus_data->s, key_from_option ); + mkipv4_address( &tacplus_data->c, client ); + tacplus_data->k=strdup( key ); + tacplus_keys = g_slist_prepend( tacplus_keys, tacplus_data ); +} + +static +void +free_tacplus_keys( gpointer data, gpointer user_data _U_ ) +{ + g_free( ((tacplus_key_entry *)data)->k ); +} + +static +void +parse_tacplus_keys( char *keys_from_option ) +{ + char *s1,*s; + + /* Drop old keys */ + if( tacplus_keys ) { + g_slist_foreach( tacplus_keys, free_tacplus_keys, NULL ); + g_slist_free( tacplus_keys ); + tacplus_keys=NULL; + } + + if( !strchr( keys_from_option, '/' ) ){ + /* option not in client/server=key format */ + return ; + } + s=strdup(keys_from_option); + s1=s; + keys_from_option = s; + while(keys_from_option){ + if( (s=strchr( keys_from_option, ' ' )) != NULL ) + *s++='\0'; + parse_tuple( keys_from_option ); + keys_from_option=s; + } + g_free( s1 ); +#ifdef DEB_TACPLUS + g_slist_foreach( tacplus_keys, tacplus_print_key_entry, GINT_TO_POINTER(1) ); +#endif +} + +static void +dissect_tacplus(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + tvbuff_t *new_tvb=NULL; + proto_tree *tacplus_tree; + proto_item *ti; + guint8 version,flags; + proto_tree *flags_tree; + proto_item *tf; + proto_item *tmp_pi; + guint32 len; + gboolean request=( pinfo->destport == TCP_PORT_TACACS ); + char *key=NULL; + + if( request ) { + key=find_key( &pinfo->dst, &pinfo->src ); + } else { + key=find_key( &pinfo->src, &pinfo->dst ); + } + if (check_col(pinfo->cinfo, COL_PROTOCOL)) + col_set_str(pinfo->cinfo, COL_PROTOCOL, "TACACS+"); + + if (check_col(pinfo->cinfo, COL_INFO)) + { + int type = tvb_get_guint8(tvb,1); + col_add_fstr( pinfo->cinfo, COL_INFO, "%s: %s", + request ? "Q" : "R", + val_to_str(type, tacplus_type_vals, "Unknown (0x%02x)")); + } + + if (tree) + { + ti = proto_tree_add_protocol_format(tree, proto_tacplus, + tvb, 0, -1, "TACACS+"); + + tacplus_tree = proto_item_add_subtree(ti, ett_tacplus); + if (pinfo->match_port == pinfo->destport) + { + proto_tree_add_boolean_hidden(tacplus_tree, + hf_tacplus_request, tvb, 0, 0, TRUE); + } + else + { + proto_tree_add_boolean_hidden(tacplus_tree, + hf_tacplus_response, tvb, 0, 0, TRUE); + } + version = tvb_get_guint8(tvb,0); + proto_tree_add_uint_format(tacplus_tree, hf_tacplus_majvers, tvb, 0, 1, + version, + "Major version: %s", + (version&0xf0)==0xc0?"TACACS+":"Unknown Version"); + proto_tree_add_uint(tacplus_tree, hf_tacplus_minvers, tvb, 0, 1, + version&0xf); + proto_tree_add_item(tacplus_tree, hf_tacplus_type, tvb, 1, 1, + FALSE); + proto_tree_add_item(tacplus_tree, hf_tacplus_seqno, tvb, 2, 1, + FALSE); + flags = tvb_get_guint8(tvb,3); + tf = proto_tree_add_uint_format(tacplus_tree, hf_tacplus_flags, + tvb, 3, 1, flags, + "Flags: 0x%02x (%s payload, %s)", + flags, + (flags&FLAGS_UNENCRYPTED) ? "Unencrypted" : + "Encrypted", + (flags&FLAGS_SINGLE) ? "Single connection" : + "Multiple Connections" ); + flags_tree = proto_item_add_subtree(tf, ett_tacplus_flags); + proto_tree_add_boolean(flags_tree, hf_tacplus_flags_payload_type, + tvb, 3, 1, flags); + proto_tree_add_boolean(flags_tree, hf_tacplus_flags_connection_type, + tvb, 3, 1, flags); + proto_tree_add_item(tacplus_tree, hf_tacplus_session_id, tvb, 4, 4, + FALSE); + len = tvb_get_ntohl(tvb,8); + proto_tree_add_uint(tacplus_tree, hf_tacplus_packet_len, tvb, 8, 4, + len); + + tmp_pi = proto_tree_add_text(tacplus_tree, tvb, TAC_PLUS_HDR_SIZE, len, "%s%s", + ((flags&FLAGS_UNENCRYPTED)?"":"Encrypted "), request?"Request":"Reply" ); + + if( flags&FLAGS_UNENCRYPTED ) { + new_tvb = tvb_new_subset( tvb, TAC_PLUS_HDR_SIZE, len, len ); + } else { + new_tvb=NULL; + if( key && *key ){ + tacplus_decrypted_tvb_setup( tvb, &new_tvb, pinfo, len, version, key ); + } + } + if( new_tvb ) { + /* Check to see if I've a decrypted tacacs packet */ + if( !(flags&FLAGS_UNENCRYPTED) ){ + tmp_pi = proto_tree_add_text(tacplus_tree, new_tvb, 0, len, "Decrypted %s", + request?"Request":"Reply" ); + } + dissect_tacplus_body( tvb, new_tvb, proto_item_add_subtree( tmp_pi, ett_tacplus_body )); + } + } +} + +void +tacplus_pref_cb(void) +{ + parse_tacplus_keys( tacplus_opt_key ); +} + +void +proto_register_tacplus(void) +{ + static hf_register_info hf[] = { + { &hf_tacplus_response, + { "Response", "tacplus.response", + FT_BOOLEAN, BASE_NONE, NULL, 0x0, + "TRUE if TACACS+ response", HFILL }}, + { &hf_tacplus_request, + { "Request", "tacplus.request", + FT_BOOLEAN, BASE_NONE, NULL, 0x0, + "TRUE if TACACS+ request", HFILL }}, + { &hf_tacplus_majvers, + { "Major version", "tacplus.majvers", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Major version number", HFILL }}, + { &hf_tacplus_minvers, + { "Minor version", "tacplus.minvers", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Minor version number", HFILL }}, + { &hf_tacplus_type, + { "Type", "tacplus.type", + FT_UINT8, BASE_DEC, VALS(tacplus_type_vals), 0x0, + "Type", HFILL }}, + { &hf_tacplus_seqno, + { "Sequence number", "tacplus.seqno", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Sequence number", HFILL }}, + { &hf_tacplus_flags, + { "Flags", "tacplus.flags", + FT_UINT8, BASE_HEX, NULL, 0x0, + "Flags", HFILL }}, + { &hf_tacplus_flags_payload_type, + { "Unencrypted", "tacplus.flags.unencrypted", + FT_BOOLEAN, 8, TFS(&flags_set_truth), FLAGS_UNENCRYPTED, + "Is payload unencrypted?", HFILL }}, + { &hf_tacplus_flags_connection_type, + { "Single Connection", "tacplus.flags.singleconn", + FT_BOOLEAN, 8, TFS(&flags_set_truth), FLAGS_SINGLE, + "Is this a single connection?", HFILL }}, + { &hf_tacplus_acct_flags, + { "Flags", "tacplus.acct.flags", + FT_UINT8, BASE_HEX, NULL, 0x0, + "Flags", 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, + &ett_tacplus_acct_flags, + &ett_tacplus_body, + &ett_tacplus_body_chap, + }; + module_t *tacplus_module; + + 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)); + tacplus_module = prefs_register_protocol (proto_tacplus, tacplus_pref_cb ); + prefs_register_string_preference ( tacplus_module, "key", + "TACACS+ Encryption Key", "TACACS+ Encryption Key", &tacplus_opt_key ); +} + +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); +} + + +#define MD5_LEN 16 + +static void +md5_xor( guint8 *data, char *key, int data_len, guint8 *session_id, guint8 version, guint8 seq_no ) +{ + int i,j,md5_len; + md5_byte_t *md5_buff; + md5_byte_t hash[MD5_LEN]; /* the md5 hash */ + md5_byte_t *mdp; + md5_state_t mdcontext; + + md5_len = 4 /* sizeof(session_id) */ + strlen(key) + + sizeof(version) + sizeof(seq_no); + + md5_buff = (md5_byte_t*)g_malloc(md5_len+MD5_LEN); + + + mdp = md5_buff; + *(guint32*)mdp = *(guint32*)session_id; + mdp += 4 ; + memcpy(mdp, key, strlen(key)); + mdp += strlen(key); + *mdp++ = version; + *mdp++ = seq_no; + + + md5_init(&mdcontext); + md5_append(&mdcontext, md5_buff, md5_len); + md5_finish(&mdcontext,hash); + md5_len += MD5_LEN; + for (i = 0; i < data_len; i += 16) { + + for (j = 0; j < 16; j++) { + if ((i + j) >= data_len) { + i = data_len+1; /* To exit from the external loop */ + break; + } + data[i + j] ^= hash[j]; + } + memcpy(mdp, hash, MD5_LEN); + md5_init(&mdcontext); + md5_append(&mdcontext, md5_buff, md5_len); + md5_finish(&mdcontext,hash); + } + g_free( md5_buff ); +} |