161 lines
4.8 KiB
C++
161 lines
4.8 KiB
C++
/*
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*
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* Copyright (c) 2011-2016 The University of Waikato, Hamilton, New Zealand.
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* All rights reserved.
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*
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* This file is part of libprotoident.
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*
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* This code has been developed by the University of Waikato WAND
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* research group. For further information please see http://www.wand.net.nz/
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*
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* libprotoident is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* libprotoident 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#include <string.h>
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#include "libprotoident.h"
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#include "proto_manager.h"
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#include "proto_common.h"
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static bool match_facetime_stun_request(uint32_t payload, uint32_t len) {
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/* Bytes 3 and 4 are the Message Length - the STUN header */
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if ((ntohl(payload) & 0x0000ffff) != len - 20)
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return false;
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if (MATCH(payload, 0x0f, 0xe0, ANY, ANY))
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return true;
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if (MATCH(payload, 0x0f, 0xe1, ANY, ANY))
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return true;
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if (MATCH(payload, 0x0f, 0xe4, ANY, ANY))
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return true;
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return false;
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}
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static bool match_facetime_stun_response(uint32_t payload, uint32_t len) {
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/* Bytes 3 and 4 are the Message Length - the STUN header */
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if ((ntohl(payload) & 0x0000ffff) != len - 20)
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return false;
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if (MATCH(payload, 0x0e, 0xe0, ANY, ANY))
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return true;
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if (MATCH(payload, 0x0e, 0xe1, ANY, ANY))
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return true;
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if (MATCH(payload, 0x0e, 0xe4, ANY, ANY))
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return true;
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return false;
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}
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static bool match_skype_stun_request(uint32_t payload, uint32_t len) {
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/* Bytes 3 and 4 are the Message Length - the STUN header */
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if ((ntohl(payload) & 0x0000ffff) != len - 20)
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return false;
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/* These flows start with an Allocate Request */
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if (MATCH(payload, 0x00, 0x03, ANY, ANY))
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return true;
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return false;
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}
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static bool match_stun_payload(uint32_t payload, uint32_t len) {
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if (len == 0)
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return true;
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/* Bytes 3 and 4 are the Message Length - the STUN header */
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if ((ntohl(payload) & 0x0000ffff) != len - 20)
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return false;
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if (MATCH(payload, 0x00, 0x01, ANY, ANY))
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return true;
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if (MATCH(payload, 0x01, 0x01, ANY, ANY))
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return true;
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if (MATCH(payload, 0x01, 0x11, ANY, ANY))
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return true;
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if (MATCH(payload, 0x00, 0x03, ANY, ANY))
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return true;
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if (MATCH(payload, 0x01, 0x03, ANY, ANY))
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return true;
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if (MATCH(payload, 0x01, 0x13, ANY, ANY))
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return true;
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/* Data Indication message (used by Skype) */
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if (MATCH(payload, 0x01, 0x15, ANY, ANY))
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return true;
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return false;
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}
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static inline bool match_stun(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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/* This seems to be a special response containing a STUN token
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*
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* Not very well-documented though :(
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*/
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if (match_str_either(data, "RSP/"))
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return true;
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if (match_stun_payload(data->payload[0], data->payload_len[0])) {
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if (match_stun_payload(data->payload[1], data->payload_len[1]))
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return true;
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}
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if (match_facetime_stun_request(data->payload[0], data->payload_len[0]))
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{
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if ((data->payload[0] & 0xff0000) ==
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(data->payload[1] & 0xff0000) &&
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match_facetime_stun_response(data->payload[1],
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data->payload_len[1])) {
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return true;
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}
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}
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if (match_facetime_stun_request(data->payload[1], data->payload_len[1]))
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{
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/* Byte 2 must match for both directions */
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if ((data->payload[0] & 0xff0000) ==
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(data->payload[1] & 0xff0000) &&
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match_facetime_stun_response(data->payload[0],
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data->payload_len[0])) {
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return true;
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}
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}
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return false;
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}
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static lpi_module_t lpi_stun = {
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LPI_PROTO_UDP_STUN,
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LPI_CATEGORY_NAT,
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"STUN",
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3,
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match_stun
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};
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void register_stun(LPIModuleMap *mod_map) {
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register_protocol(&lpi_stun, mod_map);
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}
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