567 lines
17 KiB
C
567 lines
17 KiB
C
![]() |
/* packet-stun2.c
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* Routines for Simple Traversal Underneath NAT dissection
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* Copyright 2003, Shiang-Ming Huang <smhuang@pcs.csie.nctu.edu.tw>
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* Copyright 2006, Marc Petit-Huguenin <marc@petit-huguenin.org>
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*
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* $Id$
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Please refer to draft-ietf-behave-rfc3489bis-05 for protocol detail.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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/* Initialize the protocol and registered fields */
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static int proto_stun2 = -1;
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static int hf_stun2_class = -1;
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static int hf_stun2_method = -1;
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static int hf_stun2_length = -1;
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static int hf_stun2_cookie = -1;
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static int hf_stun2_id = -1;
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static int hf_stun2_att = -1;
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static int stun2_att_type = -1; /* STUN2 attribute fields */
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static int stun2_att_length = -1;
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static int stun2_att_family = -1;
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static int stun2_att_ipv4 = -1;
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static int stun2_att_ipv6 = -1;
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static int stun2_att_port = -1;
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static int stun2_att_username = -1;
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static int stun2_att_padding = -1;
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static int stun2_att_password = -1;
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static int stun2_att_hmac = -1;
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static int stun2_att_crc32 = -1;
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static int stun2_att_error_class = -1;
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static int stun2_att_error_number = -1;
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static int stun2_att_error_reason = -1;
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static int stun2_att_realm = -1;
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static int stun2_att_nonce = -1;
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static int stun2_att_unknown = -1;
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static int stun2_att_xor_ipv4 = -1;
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static int stun2_att_xor_ipv6 = -1;
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static int stun2_att_xor_port = -1;
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static int stun2_att_server = -1;
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static int stun2_att_refresh_interval = -1;
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static int stun2_att_value = -1;
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/* Message classes */
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#define CLASS_MASK 0xC110
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#define REQUEST 0x0000
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#define INDICATION 0x0001
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#define RESPONSE 0x0010
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#define ERROR 0x0011
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/* Message methods */
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#define METHOD_MASK 0xCEEF
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#define BINDING 0x0001
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#define SHARED_SECRET 0x0002
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/* Attribute Types */
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#define MAPPED_ADDRESS 0x0001
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#define USERNAME 0x0006
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#define PASSWORD 0x0007
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#define MESSAGE_INTEGRITY 0x0008
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#define ERROR_CODE 0x0009
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#define UNKNOWN_ATTRIBUTES 0x000a
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#define REALM 0x0014
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#define NONCE 0x0015
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#define XOR_MAPPED_ADDRESS 0x0020
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#define SERVER 0x8022
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#define ALTERNATE_SERVER 0x8023
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#define REFRESH_INTERVAL 0x8024
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#define FINGERPRINT 0x8025
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/* Initialize the subtree pointers */
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static gint ett_stun2 = -1;
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static gint ett_stun2_att_type = -1;
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static gint ett_stun2_att = -1;
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#define UDP_PORT_STUN2 3478
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#define TCP_PORT_STUN2 3478
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#define STUN2_HDR_LEN 20 /* STUN2 message header length */
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#define ATTR_HDR_LEN 4 /* STUN2 attribute header length */
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static const value_string classes[] = {
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{REQUEST, "Request"},
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{INDICATION, "Indication"},
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{RESPONSE, "Response"},
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{ERROR, "Error Response"},
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{0x00, NULL}
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};
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static const value_string methods[] = {
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{BINDING, "Binding"},
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{SHARED_SECRET, "Shared Secret"},
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{0x00, NULL}
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};
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static const value_string attributes[] = {
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{MAPPED_ADDRESS, "MAPPED-ADDRESS"},
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{USERNAME, "USERNAME"},
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{PASSWORD, "PASSWORD"},
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{MESSAGE_INTEGRITY, "MESSAGE-INTEGRITY"},
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{ERROR_CODE, "ERROR-CODE"},
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{UNKNOWN_ATTRIBUTES, "UNKNOWN-ATTRIBUTES"},
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{REALM, "REALM"},
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{NONCE, "NONCE"},
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{XOR_MAPPED_ADDRESS, "XOR-MAPPED-ADDRESS"},
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{SERVER, "SERVER"},
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{ALTERNATE_SERVER, "ALTERNATE-SERVER"},
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{REFRESH_INTERVAL, "REFRESH-INTERVAL"},
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{FINGERPRINT, "FINGERPRINT"},
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{0x00, NULL}
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};
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static const value_string attributes_family[] = {
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{0x0001, "IPv4"},
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{0x0002, "IPv6"},
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{0x00, NULL}
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};
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static int
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dissect_stun2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_item *ta;
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proto_tree *stun2_tree;
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proto_tree *att_type_tree;
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proto_tree *att_tree;
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guint16 msg_type;
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guint16 msg_length;
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const char *msg_class_str;
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const char *msg_method_str;
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guint16 att_type;
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guint16 att_length;
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guint16 offset;
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guint i;
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/*
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* First check if the frame is really meant for us.
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*/
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/* First, make sure we have enough data to do the check. */
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if (!tvb_bytes_exist(tvb, 0, STUN2_HDR_LEN))
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return 0;
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msg_type = tvb_get_ntohs(tvb, 0);
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msg_length = tvb_get_ntohs(tvb, 2);
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/* Check if it is really a STUN2 message */
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if (msg_type & 0xC000 || tvb_get_ntohl(tvb, 4) != 0x2112a442)
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return 0;
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/* check if payload enough */
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if (!tvb_bytes_exist(tvb, 0, STUN2_HDR_LEN+msg_length))
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return 0;
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/* Check if too much payload */
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if (tvb_bytes_exist(tvb, 0, STUN2_HDR_LEN+msg_length+1))
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return 0;
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/* The message seems to be a valid STUN2 message! */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "STUN2");
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msg_class_str = match_strval((msg_type & CLASS_MASK) >> 4, classes);
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msg_method_str = match_strval(msg_type & METHOD_MASK, methods);
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if (msg_method_str == NULL)
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msg_method_str = "Unknown";
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s %s",
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msg_method_str, msg_class_str);
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if (tree) {
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guint transaction_id_first_word;
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ti = proto_tree_add_item(tree, proto_stun2, tvb, 0, -1, FALSE);
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stun2_tree = proto_item_add_subtree(ti, ett_stun2);
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proto_tree_add_uint(stun2_tree, hf_stun2_class, tvb, 0, 2, msg_type);
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proto_tree_add_uint(stun2_tree, hf_stun2_method, tvb, 0, 2, msg_type);
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proto_tree_add_uint(stun2_tree, hf_stun2_length, tvb, 2, 2, msg_length);
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proto_tree_add_item(stun2_tree, hf_stun2_cookie, tvb, 4, 4, FALSE);
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proto_tree_add_item(stun2_tree, hf_stun2_id, tvb, 8, 12, FALSE);
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/* Remember this (in host order) so we can show clear xor'd addresses */
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/* TODO IPv6 support */
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transaction_id_first_word = tvb_get_ntohl(tvb, 4);
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if (msg_length > 0) {
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ta = proto_tree_add_item(stun2_tree, hf_stun2_att, tvb, STUN2_HDR_LEN, msg_length, FALSE);
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att_type_tree = proto_item_add_subtree(ta, ett_stun2_att_type);
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offset = STUN2_HDR_LEN;
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while (msg_length > 0) {
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att_type = tvb_get_ntohs(tvb, offset); /* Type field in attribute header */
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att_length = tvb_get_ntohs(tvb, offset+2); /* Length field in attribute header */
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ta = proto_tree_add_text(att_type_tree, tvb, offset,
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ATTR_HDR_LEN+att_length,
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"Attribute: %s",
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val_to_str(att_type, attributes, "Unknown (0x%04x)"));
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att_tree = proto_item_add_subtree(ta, ett_stun2_att);
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proto_tree_add_uint(att_tree, stun2_att_type, tvb,
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offset, 2, att_type);
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offset += 2;
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if (ATTR_HDR_LEN+att_length > msg_length) {
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proto_tree_add_uint_format(att_tree,
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stun2_att_length, tvb, offset, 2,
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att_length,
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"Attribute Length: %u (bogus, goes past the end of the message)",
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att_length);
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break;
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}
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proto_tree_add_uint(att_tree, stun2_att_length, tvb,
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offset, 2, att_length);
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offset += 2;
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switch (att_type) {
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case MAPPED_ADDRESS:
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case ALTERNATE_SERVER:
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if (att_length < 2)
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break;
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proto_tree_add_item(att_tree, stun2_att_family, tvb, offset+1, 1, FALSE);
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if (att_length < 4)
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break;
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proto_tree_add_item(att_tree, stun2_att_port, tvb, offset+2, 2, FALSE);
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switch (tvb_get_guint8(tvb, offset+1)) {
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case 1:
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if (att_length < 8)
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break;
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proto_tree_add_item(att_tree, stun2_att_ipv4, tvb, offset+4, 4, FALSE);
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break;
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case 2:
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if (att_length < 20)
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break;
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proto_tree_add_item(att_tree, stun2_att_ipv6, tvb, offset+4, 16, FALSE);
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break;
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}
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break;
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case USERNAME:
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proto_tree_add_item(att_tree, stun2_att_username, tvb, offset, att_length, FALSE);
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if (att_length % 4 != 0)
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proto_tree_add_uint(att_tree, stun2_att_padding, tvb, offset+att_length, 4-(att_length % 4), 4-(att_length % 4));
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break;
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case PASSWORD:
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proto_tree_add_item(att_tree, stun2_att_password, tvb, offset, att_length, FALSE);
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if (att_length % 4 != 0)
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proto_tree_add_uint(att_tree, stun2_att_padding, tvb, offset+att_length, 4-(att_length % 4), 4-(att_length % 4));
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break;
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case NONCE:
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proto_tree_add_item(att_tree, stun2_att_nonce, tvb, offset, att_length, FALSE);
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if (att_length % 4 != 0)
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proto_tree_add_uint(att_tree, stun2_att_padding, tvb, offset+att_length, 4-(att_length % 4), 4-(att_length % 4));
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break;
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case REALM:
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proto_tree_add_item(att_tree, stun2_att_realm, tvb, offset, att_length, FALSE);
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if (att_length % 4 != 0)
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proto_tree_add_uint(att_tree, stun2_att_padding, tvb, offset+att_length, 4-(att_length % 4), 4-(att_length % 4));
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break;
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case MESSAGE_INTEGRITY:
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if (att_length < 20)
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break;
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proto_tree_add_item(att_tree, stun2_att_hmac, tvb, offset, att_length, FALSE);
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break;
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case FINGERPRINT:
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if (att_length < 4)
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break;
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proto_tree_add_item(att_tree, stun2_att_crc32, tvb, offset, att_length, FALSE);
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break;
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case ERROR_CODE:
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if (att_length < 3)
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break;
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proto_tree_add_item(att_tree, stun2_att_error_class, tvb, offset+2, 1, FALSE);
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if (att_length < 4)
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break;
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proto_tree_add_item(att_tree, stun2_att_error_number, tvb, offset+3, 1, FALSE);
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if (att_length < 5)
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break;
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proto_tree_add_item(att_tree, stun2_att_error_reason, tvb, offset+4, att_length-4, FALSE);
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if (att_length % 4 != 0)
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proto_tree_add_uint(att_tree, stun2_att_padding, tvb, offset+att_length, 4-(att_length % 4), 4-(att_length % 4));
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break;
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case UNKNOWN_ATTRIBUTES:
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for (i = 0; i < att_length; i += 2)
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proto_tree_add_item(att_tree, stun2_att_unknown, tvb, offset+i, 2, FALSE);
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if (att_length % 4 != 0)
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proto_tree_add_uint(att_tree, stun2_att_padding, tvb, offset+att_length, 4-(att_length % 4), 4-(att_length % 4));
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break;
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case SERVER:
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proto_tree_add_item(att_tree, stun2_att_server, tvb, offset, att_length, FALSE);
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if (att_length % 4 != 0)
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proto_tree_add_uint(att_tree, stun2_att_padding, tvb, offset+att_length, 4-(att_length % 4), 4-(att_length % 4));
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break;
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case XOR_MAPPED_ADDRESS:
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if (att_length < 2)
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break;
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proto_tree_add_item(att_tree, stun2_att_family, tvb, offset+1, 1, FALSE);
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if (att_length < 4)
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break;
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proto_tree_add_item(att_tree, stun2_att_xor_port, tvb, offset+2, 2, FALSE);
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/* Show the port 'in the clear'
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XOR (host order) transid with (host order) xor-port.
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Add host-order port into tree. */
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ti = proto_tree_add_uint(att_tree, stun2_att_port, tvb, offset+2, 2,
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tvb_get_ntohs(tvb, offset+2) ^
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(transaction_id_first_word >> 16));
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PROTO_ITEM_SET_GENERATED(ti);
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if (att_length < 8)
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break;
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switch (tvb_get_guint8(tvb, offset+1) ){
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case 1:
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if (att_length < 8)
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break;
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proto_tree_add_item(att_tree, stun2_att_xor_ipv4, tvb, offset+4, 4, FALSE);
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/* Show the address 'in the clear'.
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XOR (host order) transid with (host order) xor-address.
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Add in network order tree. */
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ti = proto_tree_add_ipv4(att_tree, stun2_att_ipv4, tvb, offset+4, 4,
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g_htonl(tvb_get_ntohl(tvb, offset+4) ^
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transaction_id_first_word));
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PROTO_ITEM_SET_GENERATED(ti);
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break;
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case 2:
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if (att_length < 20)
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break;
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/* TODO add IPv6 */
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proto_tree_add_item(att_tree, stun2_att_xor_ipv6, tvb, offset+4, 16, FALSE);
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break;
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}
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break;
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case REFRESH_INTERVAL:
|
||
|
if (att_length < 4)
|
||
|
break;
|
||
|
proto_tree_add_item(att_tree, stun2_att_refresh_interval, tvb, offset, 4, FALSE);
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
if (att_length > 0)
|
||
|
proto_tree_add_item(att_tree, stun2_att_value, tvb, offset, att_length, FALSE);
|
||
|
if (att_length % 4 != 0)
|
||
|
proto_tree_add_uint(att_tree, stun2_att_padding, tvb, offset+att_length, 4-(att_length % 4), 4-(att_length % 4));
|
||
|
break;
|
||
|
}
|
||
|
offset += (att_length+3) & -4;
|
||
|
msg_length -= (ATTR_HDR_LEN+att_length+3) & -4;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
return tvb_length(tvb);
|
||
|
}
|
||
|
|
||
|
|
||
|
static gboolean
|
||
|
dissect_stun2_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
||
|
{
|
||
|
if (dissect_stun2(tvb, pinfo, tree) == 0)
|
||
|
return FALSE;
|
||
|
|
||
|
return TRUE;
|
||
|
}
|
||
|
|
||
|
void
|
||
|
proto_register_stun2(void)
|
||
|
{
|
||
|
static hf_register_info hf[] = {
|
||
|
{ &hf_stun2_class,
|
||
|
{ "Message Class", "stun2.class", FT_UINT16,
|
||
|
BASE_HEX, VALS(classes), 0x0110, "", HFILL }
|
||
|
},
|
||
|
{ &hf_stun2_method,
|
||
|
{ "Message Method", "stun2.method", FT_UINT16,
|
||
|
BASE_HEX, VALS(methods), 0x3EEF, "", HFILL }
|
||
|
},
|
||
|
{ &hf_stun2_length,
|
||
|
{ "Message Length", "stun2.length", FT_UINT16,
|
||
|
BASE_HEX, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &hf_stun2_cookie,
|
||
|
{ "Message Cookie", "stun2.cookie", FT_BYTES,
|
||
|
BASE_HEX, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &hf_stun2_id,
|
||
|
{ "Message Transaction ID", "stun2.id", FT_BYTES,
|
||
|
BASE_HEX, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &hf_stun2_att,
|
||
|
{ "Attributes", "stun2.att", FT_NONE,
|
||
|
0, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
/* ////////////////////////////////////// */
|
||
|
{ &stun2_att_type,
|
||
|
{ "Attribute Type", "stun2.att.type", FT_UINT16,
|
||
|
BASE_HEX, VALS(attributes), 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_length,
|
||
|
{ "Attribute Length", "stun2.att.length", FT_UINT16,
|
||
|
BASE_DEC, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_family,
|
||
|
{ "Protocol Family", "stun2.att.family", FT_UINT16,
|
||
|
BASE_HEX, VALS(attributes_family), 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_ipv4,
|
||
|
{ "IP", "stun2.att.ipv4", FT_IPv4,
|
||
|
BASE_NONE, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_ipv6,
|
||
|
{ "IP", "stun2.att.ipv6", FT_IPv6,
|
||
|
BASE_NONE, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_port,
|
||
|
{ "Port", "stun2.att.port", FT_UINT16,
|
||
|
BASE_DEC, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_username,
|
||
|
{ "Username", "stun2.att.username", FT_STRING,
|
||
|
BASE_NONE, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_padding,
|
||
|
{ "Padding", "stun2.att.padding", FT_UINT16,
|
||
|
BASE_DEC, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_password,
|
||
|
{ "Password", "stun2.att.password", FT_STRING,
|
||
|
BASE_NONE, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_hmac,
|
||
|
{ "HMAC-SHA1", "stun2.att.hmac", FT_BYTES,
|
||
|
BASE_HEX, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_crc32,
|
||
|
{ "CRC-32", "stun2.att.crc32", FT_UINT32,
|
||
|
BASE_HEX, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_error_class,
|
||
|
{ "Error Class","stun2.att.error.class", FT_UINT8,
|
||
|
BASE_DEC, NULL, 0x07, "", HFILL}
|
||
|
},
|
||
|
{ &stun2_att_error_number,
|
||
|
{ "Error Code","stun2.att.error", FT_UINT8,
|
||
|
BASE_DEC, NULL, 0x0, "", HFILL}
|
||
|
},
|
||
|
{ &stun2_att_error_reason,
|
||
|
{ "Error Reason Phase","stun2.att.error.reason", FT_STRING,
|
||
|
BASE_NONE, NULL, 0x0, "", HFILL}
|
||
|
},
|
||
|
{ &stun2_att_realm,
|
||
|
{ "Realm", "stun2.att.realm", FT_STRING,
|
||
|
BASE_NONE, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_nonce,
|
||
|
{ "Nonce", "stun2.att.nonce", FT_STRING,
|
||
|
BASE_NONE, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_unknown,
|
||
|
{ "Unknown Attribute","stun2.att.unknown", FT_UINT16,
|
||
|
BASE_HEX, NULL, 0x0, "", HFILL}
|
||
|
},
|
||
|
{ &stun2_att_xor_ipv4,
|
||
|
{ "IP (XOR-d)", "stun2.att.ipv4-xord", FT_IPv4,
|
||
|
BASE_NONE, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_xor_ipv6,
|
||
|
{ "IP (XOR-d)", "stun2.att.ipv6-xord", FT_IPv6,
|
||
|
BASE_NONE, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_xor_port,
|
||
|
{ "Port (XOR-d)", "stun2.att.port-xord", FT_UINT16,
|
||
|
BASE_DEC, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
{ &stun2_att_server,
|
||
|
{ "Server software","stun2.att.server", FT_STRING,
|
||
|
BASE_NONE, NULL, 0x0, "", HFILL}
|
||
|
},
|
||
|
{ &stun2_att_refresh_interval,
|
||
|
{ "Refresh Interval","stun2.att.refresh-interval", FT_UINT16,
|
||
|
BASE_DEC, NULL, 0x0, "", HFILL}
|
||
|
},
|
||
|
{ &stun2_att_value,
|
||
|
{ "Value", "stun2.value", FT_BYTES,
|
||
|
BASE_HEX, NULL, 0x0, "", HFILL }
|
||
|
},
|
||
|
};
|
||
|
|
||
|
/* Setup protocol subtree array */
|
||
|
static gint *ett[] = {
|
||
|
&ett_stun2,
|
||
|
&ett_stun2_att_type,
|
||
|
&ett_stun2_att,
|
||
|
};
|
||
|
|
||
|
/* Register the protocol name and description */
|
||
|
proto_stun2 = proto_register_protocol("Simple Traversal Underneath NAT",
|
||
|
"STUN2", "stun2");
|
||
|
|
||
|
/* Required function calls to register the header fields and subtrees used */
|
||
|
proto_register_field_array(proto_stun2, hf, array_length(hf));
|
||
|
proto_register_subtree_array(ett, array_length(ett));
|
||
|
|
||
|
new_register_dissector("stun2", dissect_stun2, proto_stun2);
|
||
|
}
|
||
|
|
||
|
|
||
|
void
|
||
|
proto_reg_handoff_stun2(void)
|
||
|
{
|
||
|
dissector_handle_t stun2_handle;
|
||
|
|
||
|
stun2_handle = find_dissector("stun2");
|
||
|
|
||
|
dissector_add("tcp.port", TCP_PORT_STUN2, stun2_handle);
|
||
|
dissector_add("udp.port", UDP_PORT_STUN2, stun2_handle);
|
||
|
|
||
|
heur_dissector_add("udp", dissect_stun2_heur, proto_stun2);
|
||
|
heur_dissector_add("tcp", dissect_stun2_heur, proto_stun2);
|
||
|
}
|
||
|
|