/* packet-tacacs.c
- * Routines for cisco tacacs/tacplus/AAA packet dissection
+ * 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: packet-tacacs.c,v 1.6 2000/08/07 03:21:15 guy Exp $
+ * $Id: packet-tacacs.c,v 1.26 2003/09/20 09:54:11 guy Exp $
*
* Ethereal - Network traffic analyzer
- * By Gerald Combs <gerald@zing.org>
+ * By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
- * Copied from packet-tftp.c
- *
+ * 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>
-#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"
+#include <epan/packet.h>
+
+#include "prefs.h"
+#include "crypt-md5.h"
+#include "packet-tacacs.h"
+
+static int md5_xor( u_char *data, char *key, int data_len, guint32 session_id, u_char version, u_char seq_no );
static int proto_tacacs = -1;
-static int hf_tacacs_request = -1;
-static int hf_tacacs_response = -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_key;
+
+#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(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
+dissect_tacacs(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
- proto_tree *tacacs_tree, *ti;
+ proto_tree *tacacs_tree;
+ proto_item *ti;
+ guint8 txt_buff[255+1],version,type,userlen,passlen;
- if (check_col(fd, COL_PROTOCOL))
- col_add_str(fd, COL_PROTOCOL, "TACACS");
+ 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);
- if (check_col(fd, COL_INFO))
- {
- col_add_fstr(fd, COL_INFO, "%s",
- (pi.match_port == pi.destport) ? "Request" : "Response");
+ version = tvb_get_guint8(tvb,0);
+ if (version != 0) {
+ if (check_col(pinfo->cinfo, COL_PROTOCOL))
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "XTACACS");
}
- if (tree)
+ 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_item(tree, proto_tacacs, NullTVB, offset, END_OF_FRAME, FALSE);
+ 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_string(tacacs_tree, hf_tacacs_version, NullTVB, 0, 0, "XTacacs");
+ 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 (pi.match_port == pi.destport)
- {
- proto_tree_add_boolean_hidden(tacacs_tree, hf_tacacs_request, NullTVB,
- offset, END_OF_FRAME, TRUE);
- proto_tree_add_text(tacacs_tree, NullTVB, offset,
- END_OF_FRAME, "Request: <opaque data>" );
+ 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_boolean_hidden(tacacs_tree, hf_tacacs_response, NullTVB,
- offset, END_OF_FRAME, TRUE);
- proto_tree_add_text(tacacs_tree, NullTVB, offset,
- END_OF_FRAME, "Response: <opaque data>");
+ 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_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;
+
+#define FLAGS_UNENCRYPTED 0x01
+
+static const true_false_string payload_type = {
+ "Unencrypted",
+ "Encrypted"
+};
+
+#define FLAGS_SINGLE 0x04
+
+static const true_false_string connection_type = {
+ "Single",
+ "Multiple"
+};
+
+static gint
+tacplus_tvb_setup( tvbuff_t *tvb, tvbuff_t **dst_tvb, packet_info *pinfo, guint32 len, guint8 version )
+{
+ guint8 *buff;
+ guint32 tmp_sess;
+
+ buff=g_malloc(len);
+
+
+ tvb_memcpy(tvb,(guint8*)&tmp_sess,4,4);
+ tvb_memcpy(tvb, buff, TAC_PLUS_HDR_SIZE, len);
+
+ md5_xor( buff, tacplus_key, len, tmp_sess,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(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
+dissect_tacplus_args_list( tvbuff_t *tvb, proto_tree *tree, int data_off, int len_off, int arg_cnt )
{
- proto_tree *tacacs_tree, *ti;
+ 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;
+ }
+}
- if (check_col(fd, COL_PROTOCOL))
- col_add_str(fd, COL_PROTOCOL, "TACACS");
- if (check_col(fd, COL_INFO))
- {
- col_add_fstr(fd, COL_INFO, "%s",
- (pi.match_port == pi.destport) ? "Request" : "Response");
+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: 0x%01x (%s)",
+ val, 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: 0x%01x (%s)",
+ val, 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: 0x%01x (%s)", val,
+ 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=g_malloc(val+1);
+ tvb_get_nstringz0( tvb, var_off, val+1, buff );
+ proto_tree_add_text( tree, tvb, var_off, val, "User: %s", buff );
+ var_off+=val;
+ g_free(buff);
}
- if (tree)
+ 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=g_malloc(val+1);
+ tvb_get_nstringz0(tvb, var_off, val+1, buff);
+ 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: 0x%01x (%s)", val,
+ 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;
+
+ val=tvb_get_guint8( tvb, ACCT_Q_FLAGS_OFF );
+ proto_tree_add_text( tree, tvb, ACCT_Q_FLAGS_OFF, 1, "Flags: 0x%04x", val );
+
+ val=tvb_get_guint8( tvb, ACCT_Q_METHOD_OFF );
+ proto_tree_add_text( tree, tvb, ACCT_Q_METHOD_OFF, 1,
+ "Authen Method: 0x%04x (%s)",
+ val, val_to_str( val, tacplus_authen_type_vals, "Unknown Packet" ) );
+
+ 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=(guint8*)g_malloc(val+1);
+ tvb_get_nstringz0( tvb, var_off, val+1, buff );
+ 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=(guint8*)g_malloc(val+1);
+ tvb_get_nstringz0( tvb, var_off, val+1, buff );
+ 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..");
+}
+
+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->match_port == pinfo->destport);
+
+ if (check_col(pinfo->cinfo, COL_PROTOCOL))
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "TACACS+");
+
+ if (check_col(pinfo->cinfo, COL_INFO))
{
- ti = proto_tree_add_item(tree, proto_tacacs, NullTVB, offset, END_OF_FRAME, FALSE);
- tacacs_tree = proto_item_add_subtree(ti, ett_tacacs);
+ 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)"));
+ }
- proto_tree_add_string(tacacs_tree, hf_tacacs_version, NullTVB, 0, 0, "Tacacs+");
+ if (tree)
+ {
+ ti = proto_tree_add_protocol_format(tree, proto_tacplus,
+ tvb, 0, -1, "TACACS+");
- if (pi.match_port == pi.destport)
+ tacplus_tree = proto_item_add_subtree(ti, ett_tacplus);
+ if (pinfo->match_port == pinfo->destport)
{
- proto_tree_add_boolean_hidden(tacacs_tree, hf_tacacs_request, NullTVB,
- offset, END_OF_FRAME, TRUE);
- proto_tree_add_text(tacacs_tree, NullTVB, offset,
- END_OF_FRAME, "Request: <opaque data>" );
+ proto_tree_add_boolean_hidden(tacplus_tree,
+ hf_tacplus_request, tvb, 0, 0, TRUE);
}
else
{
- proto_tree_add_boolean_hidden(tacacs_tree, hf_tacacs_response, NullTVB,
- offset, END_OF_FRAME, TRUE);
- proto_tree_add_text(tacacs_tree, NullTVB, offset,
- END_OF_FRAME, "Response: <opaque data>");
+ 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: %s, %s (0x%02x)",
+ (flags&FLAGS_UNENCRYPTED) ? "Unencrypted payload" :
+ "Encrypted payload",
+ (flags&FLAGS_SINGLE) ? "Single connection" :
+ "Multiple Connections",
+ flags);
+ 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( tacplus_key && *tacplus_key ){
+ tacplus_tvb_setup(tvb,&new_tvb,pinfo,len,version);
+ }
+ }
+ 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
-proto_register_tacacs(void)
+proto_register_tacplus(void)
{
static hf_register_info hf[] = {
- { &hf_tacacs_version,
- { "Tacacs Version", "tacacs.version",
- FT_STRING, BASE_NONE, NULL, 0x0,
- "xtacacs or tacplus" }},
- { &hf_tacacs_response,
- { "Response", "tacacs.response",
+ { &hf_tacplus_response,
+ { "Response", "tacplus.response",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
- "TRUE if TACACS response" }},
- { &hf_tacacs_request,
- { "Request", "tacacs.request",
+ "TRUE if TACACS+ response", HFILL }},
+ { &hf_tacplus_request,
+ { "Request", "tacplus.request",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
- "TRUE if TACACS request" }}
+ "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,
+ { "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_tacacs,
+ &ett_tacplus,
+ &ett_tacplus_flags,
+ &ett_tacplus_body,
+ &ett_tacplus_body_chap,
};
- proto_tacacs = proto_register_protocol("TACACS", "tacacs");
- proto_register_field_array(proto_tacacs, hf, array_length(hf));
+ 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, NULL);
+ prefs_register_string_preference(tacplus_module, "key",
+ "TACACS+ Encryption Key", "TACACS+ Encryption Key",
+ &tacplus_key);
}
void
-proto_reg_handoff_tacacs(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 int
+md5_xor( u_char *data, char *key, int data_len, guint32 session_id, u_char version, u_char seq_no )
{
- old_dissector_add("udp.port", UDP_PORT_TACACS, dissect_tacacs);
- old_dissector_add("tcp.port", TCP_PORT_TACACS, dissect_tacplus);
+ 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 = sizeof(session_id) + strlen(key)
+ + sizeof(version) + sizeof(seq_no);
+
+ md5_buff = (md5_byte_t*)g_malloc(md5_len+MD5_LEN);
+
+ mdp = md5_buff;
+ bcopy(&session_id, mdp, sizeof(session_id));
+ mdp += sizeof(session_id);
+ bcopy(key, mdp, strlen(key));
+ mdp += strlen(key);
+ bcopy(&version, mdp, sizeof(version));
+ mdp += sizeof(version);
+ bcopy(&seq_no, mdp, sizeof(seq_no));
+ mdp += sizeof(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)
+ return 0;
+ data[i + j] ^= hash[j];
+ }
+ bcopy( hash, mdp , MD5_LEN );
+ md5_init(&mdcontext);
+ md5_append(&mdcontext, md5_buff, md5_len);
+ md5_finish(&mdcontext,hash);
+ }
+ g_free( md5_buff );
+ return 0;
}
git.samba.org / obnox / wireshark / wip.git / blobdiff