1329 lines
44 KiB
C
1329 lines
44 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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* Full Tacacs+ parsing with decryption by
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* Emanuele Caratti <wiz@iol.it>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/* rfc-1492 for tacacs and xtacacs
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* draft-grant-tacacs-02.txt for tacacs+ (tacplus)
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* https://tools.ietf.org/html/draft-grant-tacacs-02
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include <epan/addr_resolv.h>
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#include <wsutil/wsgcrypt.h>
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#include <epan/ws_printf.h>
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#include "packet-tcp.h"
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#include "packet-tacacs.h"
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void proto_reg_handoff_tacacs(void);
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void proto_register_tacacs(void);
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void proto_reg_handoff_tacplus(void);
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void proto_register_tacplus(void);
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static void md5_xor( guint8 *data, const char *key, int data_len, guint8 *session_id, guint8 version, guint8 seq_no );
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static int dissect_tacplus_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data);
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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 int hf_tacacs_username = -1;
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static int hf_tacacs_password = -1;
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static gint ett_tacacs = -1;
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static gboolean tacplus_preference_desegment = TRUE;
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static const char *tacplus_opt_key;
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static GSList *tacplus_keys = NULL;
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#define ADDR_INVLD "invalid"
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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 UDP_PORT_TACACS 49
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#define TCP_PORT_TACACS 49
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static int
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dissect_tacacs(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *tacacs_tree;
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proto_item *ti;
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guint32 version,type,userlen,passlen;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TACACS");
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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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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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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, version);
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proto_tree_add_uint(tacacs_tree, hf_tacacs_type, tvb, 1, 1, type);
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proto_tree_add_item(tacacs_tree, hf_tacacs_nonce, tvb, 2, 2, ENC_BIG_ENDIAN);
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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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proto_tree_add_item_ret_uint(tacacs_tree, hf_tacacs_userlen, tvb, 4, 1, ENC_NA, &userlen);
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proto_tree_add_item_ret_uint(tacacs_tree, hf_tacacs_passlen, tvb, 5, 1, ENC_NA, &passlen);
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proto_tree_add_item(tacacs_tree, hf_tacacs_username, tvb, 6, userlen, ENC_ASCII|ENC_NA);
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proto_tree_add_item(tacacs_tree, hf_tacacs_password, tvb, 6+userlen, passlen, ENC_ASCII|ENC_NA);
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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, ENC_BIG_ENDIAN);
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proto_tree_add_item(tacacs_tree, hf_tacacs_reason, tvb, 5, 1, ENC_BIG_ENDIAN);
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}
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}
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else
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{
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proto_tree_add_item_ret_uint(tacacs_tree, hf_tacacs_userlen, tvb, 4, 1, ENC_NA, &userlen);
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proto_tree_add_item_ret_uint(tacacs_tree, hf_tacacs_passlen, tvb, 5, 1, ENC_NA, &passlen);
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proto_tree_add_item(tacacs_tree, hf_tacacs_response, tvb, 6, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tacacs_tree, hf_tacacs_reason, tvb, 7, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tacacs_tree, hf_tacacs_result1, tvb, 8, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tacacs_tree, hf_tacacs_destaddr, tvb, 12, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tacacs_tree, hf_tacacs_destport, tvb, 16, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tacacs_tree, hf_tacacs_line, tvb, 18, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tacacs_tree, hf_tacacs_result2, tvb, 20, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tacacs_tree, hf_tacacs_result3, tvb, 24, 2, ENC_BIG_ENDIAN);
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if (type!=TACACS_RESPONSE)
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{
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proto_tree_add_item(tacacs_tree, hf_tacacs_username, tvb, 26, userlen, ENC_ASCII|ENC_NA);
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proto_tree_add_item(tacacs_tree, hf_tacacs_password, tvb, 26+userlen, passlen, ENC_ASCII|ENC_NA);
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}
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}
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}
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return tvb_captured_length(tvb);
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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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NULL, 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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NULL, 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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NULL, 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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NULL, 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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NULL, 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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NULL, 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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NULL, 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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NULL, 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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NULL, 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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NULL, 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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NULL, 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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NULL, 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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NULL, HFILL }},
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{ &hf_tacacs_username,
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{ "Username", "tacacs.username",
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FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_tacacs_password,
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{ "Password", "tacacs.password",
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FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, 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_uint_with_preference("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_acct_flags = -1;
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static int hf_tacplus_acct_flags_more = -1;
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static int hf_tacplus_acct_flags_start = -1;
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static int hf_tacplus_acct_flags_stop = -1;
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static int hf_tacplus_acct_flags_watchdog = -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 int hf_tacplus_auth_password = -1;
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static int hf_tacplus_port = -1;
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static int hf_tacplus_remote_address = -1;
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static int hf_tacplus_chap_challenge = -1;
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static int hf_tacplus_chap_response = -1;
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static int hf_tacplus_mschap_challenge = -1;
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static int hf_tacplus_mschap_response = -1;
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static int hf_tacplus_arap_nas_challenge = -1;
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static int hf_tacplus_arap_remote_challenge = -1;
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static int hf_tacplus_arap_remote_response = -1;
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static int hf_tacplus_privilege_level = -1;
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static int hf_tacplus_authentication_type = -1;
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static int hf_tacplus_service = -1;
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static int hf_tacplus_user_len = -1;
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static int hf_tacplus_user = -1;
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static int hf_tacplus_port_len = -1;
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static int hf_tacplus_remote_address_len = -1;
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static int hf_tacplus_arg_length = -1;
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static int hf_tacplus_arg_value = -1;
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static int hf_tacplus_chap_id = -1;
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static int hf_tacplus_mschap_id = -1;
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static int hf_tacplus_authen_action = -1;
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static int hf_tacplus_body_authen_req_cont_flags = -1;
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static int hf_tacplus_body_authen_req_cont_user_length = -1;
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static int hf_tacplus_body_authen_req_cont_user = -1;
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static int hf_tacplus_body_authen_req_cont_data_length = -1;
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static int hf_tacplus_body_authen_rep_status = -1;
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static int hf_tacplus_body_authen_rep_flags = -1;
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static int hf_tacplus_body_authen_rep_server_msg_len = -1;
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static int hf_tacplus_body_authen_rep_server_msg = -1;
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static int hf_tacplus_body_authen_rep_server_data_len = -1;
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static int hf_tacplus_body_author_req_auth_method = -1;
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static int hf_tacplus_body_author_req_arg_count = -1;
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static int hf_tacplus_body_author_rep_auth_status = -1;
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static int hf_tacplus_body_author_rep_server_msg_len = -1;
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static int hf_tacplus_body_author_rep_server_data_len = -1;
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static int hf_tacplus_body_author_rep_arg_count = -1;
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static int hf_tacplus_acct_authen_method = -1;
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static int hf_tacplus_acct_arg_count = -1;
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static int hf_tacplus_body_acct_status = -1;
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static int hf_tacplus_body_acct_server_msg_len = -1;
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static int hf_tacplus_body_acct_server_msg = -1;
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static int hf_tacplus_body_acct_data_len = -1;
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static int hf_tacplus_body_acct_data = -1;
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static int hf_tacplus_data = -1;
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/* Generated from convert_proto_tree_add_text.pl */
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static int hf_tacplus_ascii_length = -1;
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static int hf_tacplus_arap_data_length = -1;
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static int hf_tacplus_mschap_data_length = -1;
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static int hf_tacplus_chap_data_length = -1;
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static int hf_tacplus_password_length = -1;
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static int hf_tacplus_data_length = -1;
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static gint ett_tacplus = -1;
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static gint ett_tacplus_body = -1;
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static gint ett_tacplus_body_chap = -1;
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static gint ett_tacplus_flags = -1;
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static gint ett_tacplus_acct_flags = -1;
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static expert_field ei_tacplus_packet_len_invalid = EI_INIT;
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static expert_field ei_tacplus_bogus_data = EI_INIT;
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typedef struct _tacplus_key_entry {
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address *s; /* Server address */
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address *c; /* client address */
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char *k; /* Key */
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} tacplus_key_entry;
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static gint
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tacplus_decrypted_tvb_setup( tvbuff_t *tvb, tvbuff_t **dst_tvb, packet_info *pinfo, guint32 len, guint8 version, const char *key )
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{
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guint8 *buff;
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guint8 session_id[4];
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/* TODO Check the possibility to use pinfo->decrypted_data */
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/* session_id is in NETWORK Byte Order, and is used as byte array in the md5_xor */
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tvb_memcpy(tvb, session_id, 4,4);
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buff = (guint8 *)tvb_memdup(pinfo->pool, tvb, TAC_PLUS_HDR_SIZE, len);
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md5_xor( buff, key, len, session_id,version, tvb_get_guint8(tvb,2) );
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/* Allocate a new tvbuff, referring to the decrypted data. */
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*dst_tvb = tvb_new_child_real_data(tvb, buff, len, len );
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/* Add the decrypted data to the data source list. */
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add_new_data_source(pinfo, *dst_tvb, "TACACS+ Decrypted");
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return 0;
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}
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static void
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dissect_tacplus_args_list( tvbuff_t *tvb, proto_tree *tree, int data_off, int len_off, int arg_cnt )
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{
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int i;
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int len;
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guint8 *value;
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for(i=0;i<arg_cnt;i++){
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len=tvb_get_guint8(tvb,len_off+i);
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|
proto_tree_add_uint_format(tree, hf_tacplus_arg_length, tvb, len_off+i, 1, len,
|
|
"Arg[%d] length: %d", i, len);
|
|
value=tvb_get_string_enc(wmem_packet_scope(), tvb, data_off, len, ENC_ASCII|ENC_NA);
|
|
proto_tree_add_string_format(tree, hf_tacplus_arg_value, tvb, data_off, len, value,
|
|
"Arg[%d] value: %s", i, value);
|
|
data_off+=len;
|
|
}
|
|
}
|
|
|
|
|
|
static int
|
|
proto_tree_add_tacplus_common_fields( tvbuff_t *tvb, proto_tree *tree, int offset, int var_off )
|
|
{
|
|
int val;
|
|
/* priv_lvl */
|
|
proto_tree_add_item(tree, hf_tacplus_privilege_level, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
|
|
/* authen_type */
|
|
proto_tree_add_item(tree, hf_tacplus_authentication_type, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
|
|
/* service */
|
|
proto_tree_add_item(tree, hf_tacplus_service, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
|
|
/* user_len && user */
|
|
val=tvb_get_guint8(tvb,offset);
|
|
proto_tree_add_uint(tree, hf_tacplus_user_len, tvb, offset, 1, val);
|
|
|
|
if( val ){
|
|
proto_tree_add_item(tree, hf_tacplus_user, tvb, var_off, val, ENC_ASCII|ENC_NA);
|
|
var_off+=val;
|
|
}
|
|
offset++;
|
|
|
|
|
|
/* port_len && port */
|
|
val=tvb_get_guint8(tvb,offset);
|
|
proto_tree_add_uint(tree, hf_tacplus_port_len, tvb, offset, 1, val);
|
|
if( val ){
|
|
proto_tree_add_item(tree, hf_tacplus_port, tvb, var_off, val, ENC_ASCII|ENC_NA);
|
|
var_off+=val;
|
|
}
|
|
offset++;
|
|
|
|
/* rem_addr_len && rem_addr */
|
|
val=tvb_get_guint8(tvb,offset);
|
|
proto_tree_add_uint(tree, hf_tacplus_remote_address_len, tvb, offset, 1, val);
|
|
if( val ){
|
|
proto_tree_add_item(tree, hf_tacplus_remote_address, tvb, var_off, val, ENC_ASCII|ENC_NA);
|
|
var_off+=val;
|
|
}
|
|
return var_off;
|
|
}
|
|
|
|
static void
|
|
dissect_tacplus_body_authen_req_login( tvbuff_t* tvb, proto_tree *tree, int var_off )
|
|
{
|
|
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_item(tree, hf_tacplus_ascii_length, tvb, AUTHEN_S_DATA_LEN_OFF, 1, ENC_BIG_ENDIAN);
|
|
if( val )
|
|
proto_tree_add_item( tree, hf_tacplus_data, tvb, var_off, val, ENC_NA);
|
|
break;
|
|
|
|
case TAC_PLUS_AUTHEN_TYPE_PAP:
|
|
proto_tree_add_item(tree, hf_tacplus_password_length, tvb, AUTHEN_S_DATA_LEN_OFF, 1, ENC_BIG_ENDIAN);
|
|
if( val ) {
|
|
proto_tree_add_item(tree, hf_tacplus_auth_password, tvb, var_off, val, ENC_ASCII|ENC_NA);
|
|
}
|
|
break;
|
|
|
|
case TAC_PLUS_AUTHEN_TYPE_CHAP:
|
|
proto_tree_add_item(tree, hf_tacplus_chap_data_length, tvb, AUTHEN_S_DATA_LEN_OFF, 1, ENC_BIG_ENDIAN);
|
|
if( val ) {
|
|
proto_tree *pt;
|
|
guint8 chal_len=val-(1+16); /* Response field alwayes 16 octets */
|
|
pt = proto_tree_add_subtree(tree, tvb, var_off, val, ett_tacplus_body_chap, NULL, "CHAP Data" );
|
|
proto_tree_add_item(pt, hf_tacplus_chap_id, tvb, var_off, 1, ENC_BIG_ENDIAN);
|
|
var_off++;
|
|
proto_tree_add_item(pt, hf_tacplus_chap_challenge, tvb, var_off, chal_len, ENC_ASCII|ENC_NA);
|
|
var_off+=chal_len;
|
|
proto_tree_add_item(pt, hf_tacplus_chap_response, tvb, var_off, 16, ENC_ASCII|ENC_NA);
|
|
}
|
|
break;
|
|
case TAC_PLUS_AUTHEN_TYPE_MSCHAP:
|
|
proto_tree_add_item(tree, hf_tacplus_mschap_data_length, tvb, AUTHEN_S_DATA_LEN_OFF, 1, ENC_BIG_ENDIAN);
|
|
if( val ) {
|
|
proto_tree *pt;
|
|
guint8 chal_len=val-(1+49); /* Response field alwayes 49 octets */
|
|
pt = proto_tree_add_subtree(tree, tvb, var_off, val, ett_tacplus_body_chap, NULL, "MSCHAP Data" );
|
|
proto_tree_add_item(pt, hf_tacplus_mschap_id, tvb, var_off, 1, ENC_BIG_ENDIAN);
|
|
var_off++;
|
|
proto_tree_add_item(pt, hf_tacplus_mschap_challenge, tvb, var_off, chal_len, ENC_ASCII|ENC_NA);
|
|
var_off+=chal_len;
|
|
proto_tree_add_item(pt, hf_tacplus_mschap_response, tvb, var_off, 49, ENC_ASCII|ENC_NA);
|
|
}
|
|
break;
|
|
case TAC_PLUS_AUTHEN_TYPE_ARAP:
|
|
proto_tree_add_item(tree, hf_tacplus_arap_data_length, tvb, AUTHEN_S_DATA_LEN_OFF, 1, ENC_BIG_ENDIAN);
|
|
if( val ) {
|
|
proto_tree *pt;
|
|
pt = proto_tree_add_subtree(tree, tvb, var_off, val, ett_tacplus_body_chap, NULL, "ARAP Data" );
|
|
proto_tree_add_item(pt, hf_tacplus_arap_nas_challenge, tvb, var_off, 8, ENC_ASCII|ENC_NA);
|
|
var_off+=8;
|
|
proto_tree_add_item(pt, hf_tacplus_arap_remote_challenge, tvb, var_off, 8, ENC_ASCII|ENC_NA);
|
|
var_off+=8;
|
|
proto_tree_add_item(pt, hf_tacplus_arap_remote_response, tvb, var_off, 8, ENC_ASCII|ENC_NA);
|
|
}
|
|
break;
|
|
|
|
default: /* Should not be reached */
|
|
proto_tree_add_item(tree, hf_tacplus_data_length, tvb, AUTHEN_S_DATA_LEN_OFF, 1, ENC_BIG_ENDIAN);
|
|
if( val ){
|
|
proto_tree_add_item( tree, hf_tacplus_data, tvb, var_off, val, ENC_NA);
|
|
}
|
|
}
|
|
}
|
|
|
|
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_item(tree, hf_tacplus_authen_action, tvb, AUTHEN_S_ACTION_OFF, 1, ENC_BIG_ENDIAN);
|
|
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;
|
|
proto_item* ti;
|
|
|
|
val=tvb_get_guint8( tvb, AUTHEN_C_FLAGS_OFF );
|
|
ti = proto_tree_add_item(tree, hf_tacplus_body_authen_req_cont_flags, tvb, AUTHEN_C_FLAGS_OFF, 1, ENC_BIG_ENDIAN);
|
|
if (val&TAC_PLUS_CONTINUE_FLAG_ABORT)
|
|
proto_item_append_text(ti, "(Abort)");
|
|
|
|
val=tvb_get_ntohs( tvb, AUTHEN_C_USER_LEN_OFF );
|
|
proto_tree_add_uint(tree, hf_tacplus_body_authen_req_cont_user_length, tvb, AUTHEN_C_USER_LEN_OFF, 2, val);
|
|
if( val ){
|
|
proto_tree_add_item(tree, hf_tacplus_body_authen_req_cont_user, tvb, var_off, val, ENC_ASCII|ENC_NA);
|
|
var_off+=val;
|
|
}
|
|
|
|
val=tvb_get_ntohs( tvb, AUTHEN_C_DATA_LEN_OFF );
|
|
proto_tree_add_uint(tree, hf_tacplus_body_authen_req_cont_data_length, tvb, AUTHEN_C_DATA_LEN_OFF, 2, val);
|
|
if( val ){
|
|
proto_tree_add_item( tree, hf_tacplus_data, tvb, var_off, val, ENC_NA );
|
|
}
|
|
|
|
}
|
|
|
|
/* Server REPLY */
|
|
static void
|
|
dissect_tacplus_body_authen_rep( tvbuff_t *tvb, proto_tree *tree )
|
|
{
|
|
int val;
|
|
int var_off=AUTHEN_R_VARDATA_OFF;
|
|
proto_item* ti;
|
|
|
|
proto_tree_add_item(tree, hf_tacplus_body_authen_rep_status, tvb, AUTHEN_R_STATUS_OFF, 1, ENC_BIG_ENDIAN);
|
|
|
|
val=tvb_get_guint8( tvb, AUTHEN_R_FLAGS_OFF );
|
|
ti = proto_tree_add_item(tree, hf_tacplus_body_authen_rep_flags, tvb, AUTHEN_R_FLAGS_OFF, 1, ENC_BIG_ENDIAN);
|
|
if (val&TAC_PLUS_REPLY_FLAG_NOECHO)
|
|
proto_item_append_text(ti, "(NoEcho)");
|
|
|
|
val=tvb_get_ntohs(tvb, AUTHEN_R_SRV_MSG_LEN_OFF );
|
|
proto_tree_add_uint(tree, hf_tacplus_body_authen_rep_server_msg_len, tvb, AUTHEN_R_SRV_MSG_LEN_OFF, 2, val);
|
|
|
|
if( val ) {
|
|
proto_tree_add_item(tree, hf_tacplus_body_authen_rep_server_msg, tvb, var_off, val, ENC_ASCII|ENC_NA);
|
|
var_off+=val;
|
|
}
|
|
|
|
val=tvb_get_ntohs(tvb, AUTHEN_R_DATA_LEN_OFF );
|
|
proto_tree_add_uint(tree, hf_tacplus_body_authen_rep_server_data_len, tvb, AUTHEN_R_DATA_LEN_OFF, 2, val);
|
|
if( val ){
|
|
proto_tree_add_item(tree, hf_tacplus_data, tvb, var_off, val, ENC_NA );
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_tacplus_body_author_req( tvbuff_t* tvb, proto_tree *tree )
|
|
{
|
|
int val;
|
|
int var_off;
|
|
|
|
proto_tree_add_item(tree, hf_tacplus_body_author_req_auth_method, tvb, AUTHOR_Q_AUTH_METH_OFF, 1, ENC_BIG_ENDIAN);
|
|
|
|
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_item(tree, hf_tacplus_body_author_req_arg_count, tvb, AUTHOR_Q_ARGC_OFF, 1, ENC_BIG_ENDIAN);
|
|
|
|
/* 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;
|
|
|
|
proto_tree_add_item(tree, hf_tacplus_body_author_rep_auth_status, tvb, AUTHOR_R_STATUS_OFF, 1, ENC_BIG_ENDIAN);
|
|
|
|
val=tvb_get_ntohs( tvb, AUTHOR_R_SRV_MSG_LEN_OFF );
|
|
offset+=val;
|
|
proto_tree_add_item(tree, hf_tacplus_body_author_rep_server_msg_len, tvb, AUTHOR_R_SRV_MSG_LEN_OFF, 2, ENC_BIG_ENDIAN);
|
|
|
|
val=tvb_get_ntohs( tvb, AUTHOR_R_DATA_LEN_OFF );
|
|
offset+=val;
|
|
proto_tree_add_item(tree, hf_tacplus_body_author_rep_server_data_len, tvb, AUTHOR_R_DATA_LEN_OFF, 2, ENC_BIG_ENDIAN);
|
|
|
|
val=tvb_get_guint8( tvb, AUTHOR_R_ARGC_OFF);
|
|
offset+=val;
|
|
proto_tree_add_item(tree, hf_tacplus_body_author_rep_arg_count, tvb, AUTHOR_R_ARGC_OFF, 1, ENC_BIG_ENDIAN);
|
|
|
|
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;
|
|
|
|
tf = proto_tree_add_item( tree, hf_tacplus_acct_flags, tvb, ACCT_Q_FLAGS_OFF, 1, ENC_BIG_ENDIAN);
|
|
|
|
flags_tree = proto_item_add_subtree( tf, ett_tacplus_acct_flags );
|
|
proto_tree_add_item(flags_tree, hf_tacplus_acct_flags_more, tvb, ACCT_Q_FLAGS_OFF, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(flags_tree, hf_tacplus_acct_flags_start, tvb, ACCT_Q_FLAGS_OFF, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(flags_tree, hf_tacplus_acct_flags_stop, tvb, ACCT_Q_FLAGS_OFF, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(flags_tree, hf_tacplus_acct_flags_watchdog, tvb, ACCT_Q_FLAGS_OFF, 1, ENC_BIG_ENDIAN);
|
|
|
|
proto_tree_add_item(tree, hf_tacplus_acct_authen_method, tvb, ACCT_Q_METHOD_OFF, 1, ENC_BIG_ENDIAN);
|
|
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_item(tree, hf_tacplus_acct_arg_count, tvb, ACCT_Q_ARG_CNT_OFF, 1, ENC_BIG_ENDIAN);
|
|
|
|
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_R_VARDATA_OFF;
|
|
|
|
/* Status */
|
|
proto_tree_add_item(tree, hf_tacplus_body_acct_status, tvb, ACCT_R_STATUS_OFF, 1, ENC_BIG_ENDIAN);
|
|
|
|
/* Server Message */
|
|
val=tvb_get_ntohs( tvb, ACCT_R_SRV_MSG_LEN_OFF );
|
|
proto_tree_add_item(tree, hf_tacplus_body_acct_server_msg_len, tvb, ACCT_R_SRV_MSG_LEN_OFF, 2, ENC_BIG_ENDIAN);
|
|
if( val ) {
|
|
proto_tree_add_item(tree, hf_tacplus_body_acct_server_msg, tvb, var_off, val, ENC_ASCII|ENC_NA);
|
|
var_off+=val;
|
|
}
|
|
|
|
/* Data */
|
|
val=tvb_get_ntohs( tvb, ACCT_R_DATA_LEN_OFF );
|
|
proto_tree_add_item(tree, hf_tacplus_body_acct_data_len, tvb, ACCT_R_DATA_LEN_OFF, 2, ENC_BIG_ENDIAN);
|
|
if( val ) {
|
|
proto_tree_add_item(tree, hf_tacplus_body_acct_data, tvb, var_off, val, ENC_ASCII|ENC_NA);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
dissect_tacplus_body(tvbuff_t * hdr_tvb, packet_info *pinfo, 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 );
|
|
}
|
|
break;
|
|
case TAC_PLUS_AUTHOR:
|
|
if ( seq_no & 0x01)
|
|
dissect_tacplus_body_author_req( tvb, tree );
|
|
else
|
|
dissect_tacplus_body_author_rep( tvb, tree );
|
|
break;
|
|
case TAC_PLUS_ACCT:
|
|
if ( seq_no & 0x01)
|
|
dissect_tacplus_body_acct_req( tvb, tree );
|
|
else
|
|
dissect_tacplus_body_acct_rep( tvb, tree );
|
|
break;
|
|
default:
|
|
proto_tree_add_expert( tree, pinfo, &ei_tacplus_bogus_data, tvb, 0, -1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef DEB_TACPLUS
|
|
static void
|
|
tacplus_print_key_entry( gpointer data, gpointer user_data )
|
|
{
|
|
tacplus_key_entry *tacplus_data=(tacplus_key_entry *)data;
|
|
gchar *s_str, *c_str;
|
|
|
|
s_str = address_to_str( NULL, tacplus_data->s );
|
|
c_str = address_to_str( NULL, tacplus_data->c );
|
|
if( user_data ) {
|
|
ws_debug_printf("%s:%s=%s\n", s_str, c_str, tacplus_data->k );
|
|
} else {
|
|
ws_debug_printf("%s:%s\n", s_str, c_str );
|
|
}
|
|
wmem_free(NULL, s_str);
|
|
wmem_free(NULL, c_str);
|
|
}
|
|
#endif
|
|
static int
|
|
cmp_conv_address( gconstpointer p1, gconstpointer p2 )
|
|
{
|
|
const tacplus_key_entry *a1=(const tacplus_key_entry *)p1;
|
|
const tacplus_key_entry *a2=(const tacplus_key_entry *)p2;
|
|
gint32 ret;
|
|
/*
|
|
ws_debug_printf("p1=>");
|
|
tacplus_print_key_entry( p1, NULL );
|
|
ws_debug_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)
|
|
ws_debug_printf("No Client found!"); */
|
|
} else {
|
|
/* ws_debug_printf("No Server found!"); */
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static const char*
|
|
find_key( address *srv, address *cln )
|
|
{
|
|
tacplus_key_entry data;
|
|
GSList *match;
|
|
|
|
data.s=srv;
|
|
data.c=cln;
|
|
/* ws_debug_printf("Looking for: ");
|
|
tacplus_print_key_entry( (gconstpointer)&data, NULL ); */
|
|
match=g_slist_find_custom( tacplus_keys, (gpointer)&data, cmp_conv_address );
|
|
/* ws_debug_printf("Finished (%p)\n", match); */
|
|
if( match )
|
|
return ((tacplus_key_entry*)match->data)->k;
|
|
|
|
return (tacplus_keys?NULL:tacplus_opt_key);
|
|
}
|
|
|
|
static void
|
|
mkipv4_address( address **addr, const char *str_addr )
|
|
{
|
|
int ret;
|
|
char *addr_data;
|
|
|
|
*addr=g_new(address, 1);
|
|
addr_data=(char *)g_malloc( 4 );
|
|
ret = str_to_ip(str_addr, addr_data);
|
|
if (ret)
|
|
set_address(*addr, AT_IPv4, 4, addr_data);
|
|
else {
|
|
g_free(addr_data); /* not set, not used */
|
|
set_address(*addr, AT_STRINGZ, (int)strlen(ADDR_INVLD)+1, ADDR_INVLD);
|
|
}
|
|
}
|
|
static void
|
|
parse_tuple( char *key_from_option )
|
|
{
|
|
char *client,*key;
|
|
tacplus_key_entry *tacplus_data=g_new(tacplus_key_entry, 1);
|
|
/*
|
|
ws_debug_printf("keys: %s\n", key_from_option );
|
|
*/
|
|
client=strchr(key_from_option,'/');
|
|
if(!client) {
|
|
g_free(tacplus_data);
|
|
return;
|
|
}
|
|
*client++='\0';
|
|
key=strchr(client,'=');
|
|
if(!key) {
|
|
g_free(tacplus_data);
|
|
return;
|
|
}
|
|
*key++='\0';
|
|
/*
|
|
ws_debug_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=g_strdup(key);
|
|
tacplus_keys = g_slist_prepend( tacplus_keys, tacplus_data );
|
|
}
|
|
|
|
static
|
|
void
|
|
parse_tacplus_keys( const char *keys_from_option )
|
|
{
|
|
char *key_copy,*s,*s1;
|
|
|
|
/* Drop old keys */
|
|
if( tacplus_keys ) {
|
|
g_slist_free( tacplus_keys );
|
|
tacplus_keys=NULL;
|
|
}
|
|
|
|
if( !strchr( keys_from_option, '/' ) ){
|
|
/* option not in client/server=key format */
|
|
return ;
|
|
}
|
|
key_copy=g_strdup(keys_from_option);
|
|
s=key_copy;
|
|
while(s){
|
|
if( (s1=strchr( s, ' ' )) != NULL )
|
|
*s1++='\0';
|
|
parse_tuple( s );
|
|
s=s1;
|
|
}
|
|
g_free( key_copy );
|
|
#ifdef DEB_TACPLUS
|
|
g_slist_foreach( tacplus_keys, tacplus_print_key_entry, GINT_TO_POINTER(1) );
|
|
#endif
|
|
}
|
|
|
|
static guint
|
|
get_tacplus_message_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
|
|
{
|
|
return (guint)tvb_get_ntohl(tvb, offset+H_LENGTH_OFF) + TAC_PLUS_HDR_SIZE;
|
|
}
|
|
|
|
static int
|
|
dissect_tacplus(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
|
|
{
|
|
tcp_dissect_pdus(tvb, pinfo, tree, tacplus_preference_desegment, TAC_PLUS_HDR_SIZE, get_tacplus_message_len, dissect_tacplus_message, data);
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
static int
|
|
dissect_tacplus_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
|
|
{
|
|
tvbuff_t *new_tvb=NULL;
|
|
proto_tree *tacplus_tree, *body_tree;
|
|
proto_item *ti, *hidden_item;
|
|
guint8 version,flags;
|
|
proto_tree *flags_tree;
|
|
proto_item *tf;
|
|
proto_item *tmp_pi;
|
|
guint32 len;
|
|
gboolean request=( pinfo->destport == TCP_PORT_TACACS );
|
|
const char *key=NULL;
|
|
|
|
len = tvb_get_ntohl(tvb, 8);
|
|
|
|
if( request ) {
|
|
key=find_key( &pinfo->dst, &pinfo->src );
|
|
} else {
|
|
key=find_key( &pinfo->src, &pinfo->dst );
|
|
}
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TACACS+");
|
|
|
|
col_add_fstr( pinfo->cinfo, COL_INFO, "%s: %s",
|
|
request ? "Q" : "R",
|
|
val_to_str(tvb_get_guint8(tvb,1), tacplus_type_vals, "Unknown (0x%02x)"));
|
|
|
|
if (tree)
|
|
{
|
|
ti = proto_tree_add_item(tree, proto_tacplus, tvb, 0, -1, ENC_NA);
|
|
|
|
tacplus_tree = proto_item_add_subtree(ti, ett_tacplus);
|
|
if (pinfo->match_uint == pinfo->destport)
|
|
{
|
|
hidden_item = proto_tree_add_boolean(tacplus_tree,
|
|
hf_tacplus_request, tvb, 0, 0, TRUE);
|
|
}
|
|
else
|
|
{
|
|
hidden_item = proto_tree_add_boolean(tacplus_tree,
|
|
hf_tacplus_response, tvb, 0, 0, TRUE);
|
|
}
|
|
proto_item_set_hidden(hidden_item);
|
|
|
|
version = tvb_get_guint8(tvb,0);
|
|
proto_tree_add_uint_format_value(tacplus_tree, hf_tacplus_majvers, tvb, 0, 1,
|
|
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,
|
|
ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tacplus_tree, hf_tacplus_seqno, tvb, 2, 1,
|
|
ENC_BIG_ENDIAN);
|
|
flags = tvb_get_guint8(tvb,3);
|
|
tf = proto_tree_add_uint_format_value(tacplus_tree, hf_tacplus_flags,
|
|
tvb, 3, 1, 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,
|
|
ENC_BIG_ENDIAN);
|
|
|
|
tmp_pi = proto_tree_add_uint(tacplus_tree, hf_tacplus_packet_len, tvb, 8, 4, len);
|
|
if ((gint)len < 1) {
|
|
expert_add_info_format(pinfo, tmp_pi, &ei_tacplus_packet_len_invalid, "Invalid length: %u", len);
|
|
}
|
|
|
|
body_tree = proto_tree_add_subtree_format(tacplus_tree, tvb, TAC_PLUS_HDR_SIZE, len,
|
|
ett_tacplus_body, NULL, "%s%s", ((flags&FLAGS_UNENCRYPTED)?"":"Encrypted "), request?"Request":"Reply" );
|
|
|
|
if( flags&FLAGS_UNENCRYPTED ) {
|
|
new_tvb = tvb_new_subset_length( tvb, TAC_PLUS_HDR_SIZE, 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) ){
|
|
body_tree = proto_tree_add_subtree_format(tacplus_tree, new_tvb, 0, len,
|
|
ett_tacplus_body, NULL, "Decrypted %s", request?"Request":"Reply" );
|
|
}
|
|
dissect_tacplus_body( tvb, pinfo, new_tvb, body_tree);
|
|
}
|
|
}
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
static 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,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_seqno,
|
|
{ "Sequence number", "tacplus.seqno",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_flags,
|
|
{ "Flags", "tacplus.flags",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_flags_payload_type,
|
|
{ "Unencrypted", "tacplus.flags.unencrypted",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), FLAGS_UNENCRYPTED,
|
|
"Is payload unencrypted?", HFILL }},
|
|
{ &hf_tacplus_flags_connection_type,
|
|
{ "Single Connection", "tacplus.flags.singleconn",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), FLAGS_SINGLE,
|
|
"Is this a single connection?", HFILL }},
|
|
{ &hf_tacplus_acct_flags,
|
|
{ "Flags", "tacplus.acct.flags",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_acct_flags_more,
|
|
{ "More", "tacplus.acct.flags.more",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), TAC_PLUS_ACCT_FLAG_MORE,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_acct_flags_start,
|
|
{ "Start", "tacplus.acct.flags.start",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), TAC_PLUS_ACCT_FLAG_START,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_acct_flags_stop,
|
|
{ "Stop", "tacplus.acct.flags.stop",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), TAC_PLUS_ACCT_FLAG_STOP,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_acct_flags_watchdog,
|
|
{ "Watchdog", "tacplus.acct.flags.watchdog",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), TAC_PLUS_ACCT_FLAG_WATCHDOG,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_session_id,
|
|
{ "Session ID", "tacplus.session_id",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_packet_len,
|
|
{ "Packet length", "tacplus.packet_len",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_auth_password,
|
|
{ "Password", "tacplus.auth_password",
|
|
FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_port,
|
|
{ "Port", "tacplus.port",
|
|
FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_remote_address,
|
|
{ "Remote Address", "tacplus.remote_address",
|
|
FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_chap_challenge,
|
|
{ "Challenge", "tacplus.chap.challenge",
|
|
FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_chap_response,
|
|
{ "Response", "tacplus.chap.response",
|
|
FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_mschap_challenge,
|
|
{ "Challenge", "tacplus.mschap.challenge",
|
|
FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_mschap_response,
|
|
{ "Response", "tacplus.mschap.response",
|
|
FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_arap_nas_challenge,
|
|
{ "Nas Challenge", "tacplus.arap.nas_challenge",
|
|
FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_arap_remote_challenge,
|
|
{ "Remote Challenge", "tacplus.arap.remote_challenge",
|
|
FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_arap_remote_response,
|
|
{ "Remote Response", "tacplus.arap.remote_response",
|
|
FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_privilege_level,
|
|
{ "Privilege Level", "tacplus.privilege_level",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_authentication_type,
|
|
{ "Authentication type", "tacplus.authentication_type",
|
|
FT_UINT8, BASE_DEC, VALS(tacplus_authen_type_vals), 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_service,
|
|
{ "Service", "tacplus.service",
|
|
FT_UINT8, BASE_DEC, VALS(tacplus_authen_service_vals), 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_user_len,
|
|
{ "User len", "tacplus.user_len",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_user,
|
|
{ "User", "tacplus.user",
|
|
FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_port_len,
|
|
{ "Port len", "tacplus.port_len",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_remote_address_len,
|
|
{ "Remaddr len", "tacplus.address_len",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_arg_length,
|
|
{ "Length", "tacplus.arg_length",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_arg_value,
|
|
{ "Value", "tacplus.arg_value",
|
|
FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_chap_id,
|
|
{ "ID", "tacplus.chap.id",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_mschap_id,
|
|
{ "ID", "tacplus.mschap.id",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_authen_action,
|
|
{ "Action", "tacplus.authen_action",
|
|
FT_UINT8, BASE_DEC, VALS(tacplus_authen_action_vals), 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_authen_req_cont_flags,
|
|
{ "Flags", "tacplus.body_authen_req_cont.flags",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_authen_req_cont_user_length,
|
|
{ "User length", "tacplus.body_authen_req_cont.user_length",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_authen_req_cont_data_length,
|
|
{ "Data length", "tacplus.body_authen_req_cont.data_length",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_authen_req_cont_user,
|
|
{ "User", "tacplus.body_authen_req_cont.user",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_authen_rep_status,
|
|
{ "Status", "tacplus.body_authen_rep.status",
|
|
FT_UINT8, BASE_HEX, VALS(tacplus_reply_status_vals), 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_authen_rep_flags,
|
|
{ "Flags", "tacplus.body_authen_rep.flags",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_authen_rep_server_msg_len,
|
|
{ "Server message length", "tacplus.body_authen_rep.server_msg_len",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_authen_rep_server_msg,
|
|
{ "Server message", "tacplus.body_authen_rep.server_msg",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_authen_rep_server_data_len,
|
|
{ "Data length", "tacplus.body_authen_rep_server.data_len",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_author_req_auth_method,
|
|
{ "Auth Method", "tacplus.body_author_req.auth_method",
|
|
FT_UINT8, BASE_HEX, VALS(tacplus_authen_method), 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_author_req_arg_count,
|
|
{ "Arg count", "tacplus.body_author_req.arg_count",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_author_rep_auth_status,
|
|
{ "Auth Status", "tacplus.body_author_rep.auth_status",
|
|
FT_UINT8, BASE_HEX, VALS(tacplus_author_status), 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_author_rep_server_msg_len,
|
|
{ "Server Msg length", "tacplus.body_author_rep_server.msg_len",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_author_rep_server_data_len,
|
|
{ "Data length", "tacplus.body_author_rep_server.data_len",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_author_rep_arg_count,
|
|
{ "Arg count", "tacplus.body_author_rep.arg_count",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_acct_authen_method,
|
|
{ "Auth Method", "tacplus.acct.auth_method",
|
|
FT_UINT8, BASE_HEX, VALS(tacplus_authen_method), 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_acct_arg_count,
|
|
{ "Arg count", "tacplus.acct.arg_count",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_acct_status,
|
|
{ "Status", "tacplus.body_acct.status",
|
|
FT_UINT8, BASE_HEX, VALS(tacplus_acct_status), 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_acct_server_msg_len,
|
|
{ "Server Msg length", "tacplus.body_acct.msg_len",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_acct_data_len,
|
|
{ "Data length", "tacplus.body_acct.data_len",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_acct_server_msg,
|
|
{ "Server message", "tacplus.body_acct.server_msg",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_body_acct_data,
|
|
{ "Data", "tacplus.body_acct.data",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tacplus_data,
|
|
{ "Data", "tacplus.data",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
/* Generated from convert_proto_tree_add_text.pl */
|
|
{ &hf_tacplus_ascii_length, { "ASCII Data Length", "tacplus.ascii_length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_tacplus_password_length, { "Password Length", "tacplus.password_length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_tacplus_chap_data_length, { "CHAP Data Length", "tacplus.chap_data_length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_tacplus_mschap_data_length, { "MSCHAP Data Length", "tacplus.mschap_data_length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_tacplus_arap_data_length, { "ARAP Data Length", "tacplus.arap_data_length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_tacplus_data_length, { "Data", "tacplus.data_length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_tacplus,
|
|
&ett_tacplus_flags,
|
|
&ett_tacplus_acct_flags,
|
|
&ett_tacplus_body,
|
|
&ett_tacplus_body_chap,
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_tacplus_packet_len_invalid, { "tacplus.packet_len.invalid", PI_PROTOCOL, PI_WARN, "Invalid length", EXPFILL }},
|
|
{ &ei_tacplus_bogus_data, { "tacplus.bogus_data", PI_PROTOCOL, PI_WARN, "Bogus data", EXPFILL }},
|
|
};
|
|
|
|
module_t *tacplus_module;
|
|
expert_module_t* expert_tacplus;
|
|
|
|
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));
|
|
expert_tacplus = expert_register_protocol(proto_tacplus);
|
|
expert_register_field_array(expert_tacplus, ei, array_length(ei));
|
|
tacplus_module = prefs_register_protocol (proto_tacplus, tacplus_pref_cb );
|
|
|
|
prefs_register_bool_preference(tacplus_module, "desegment", "Reassemble TACACS+ messages spanning multiple TCP segments.", "Whether the TACACS+ dissector should reassemble messages spanning multiple TCP segments. To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.", &tacplus_preference_desegment);
|
|
|
|
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_uint_with_preference("tcp.port", TCP_PORT_TACACS, tacplus_handle);
|
|
}
|
|
|
|
static void
|
|
md5_xor( guint8 *data, const char *key, int data_len, guint8 *session_id, guint8 version, guint8 seq_no )
|
|
{
|
|
int i,j;
|
|
size_t md5_len;
|
|
guint8 *md5_buff;
|
|
guint8 hash[HASH_MD5_LENGTH]; /* the md5 hash */
|
|
guint8 *mdp;
|
|
|
|
md5_len = 4 /* sizeof(session_id) */ + strlen(key)
|
|
+ sizeof(version) + sizeof(seq_no);
|
|
|
|
md5_buff = (guint8*)wmem_alloc(wmem_packet_scope(), md5_len + HASH_MD5_LENGTH);
|
|
|
|
|
|
mdp = md5_buff;
|
|
memcpy(mdp, session_id, 4);
|
|
mdp += 4 ;
|
|
memcpy(mdp, key, strlen(key));
|
|
mdp += strlen(key);
|
|
*mdp++ = version;
|
|
*mdp++ = seq_no;
|
|
|
|
|
|
gcry_md_hash_buffer(GCRY_MD_MD5, hash, md5_buff, md5_len);
|
|
md5_len += HASH_MD5_LENGTH;
|
|
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, HASH_MD5_LENGTH);
|
|
gcry_md_hash_buffer(GCRY_MD_MD5, hash, md5_buff, md5_len);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|