106 lines
3.1 KiB
C++
106 lines
3.1 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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/* This is basically SSL for UDP. Used by AnyConnect.
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* It is possible that we can subclassify this traffic, e.g. maybe AnyConnect
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* is the only DTLS app that uses port 443 for instance...
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*
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* Thanks to Remy Mudingay for helping to identify this protocol
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*/
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static inline bool match_dtls(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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/* DTLS uses entirely different versioning to conventional TLS */
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if (MATCH(data->payload[0], 0x17, 0x01, 0x00, 0x00)) {
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if (data->payload_len[1] == 0)
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return true;
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if (MATCH(data->payload[1], 0x17, 0x01, 0x00, 0x00))
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return true;
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}
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if (MATCH(data->payload[1], 0x17, 0x01, 0x00, 0x00)) {
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if (data->payload_len[0] == 0)
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return true;
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}
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if (MATCHSTR(data->payload[0], "\x16\xfe\xff\x00")) {
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if (data->payload_len[1] == 0)
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return true;
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if (MATCHSTR(data->payload[1], "\x16\xfe\xff\x00"))
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return true;
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}
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if (MATCHSTR(data->payload[1], "\x16\xfe\xff\x00")) {
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if (data->payload_len[0] == 0)
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return true;
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if (MATCHSTR(data->payload[0], "\x16\xfe\xff\x00"))
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return true;
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}
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/* DTLS 1.2 */
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if (MATCHSTR(data->payload[0], "\x16\xfe\xfd\x00")) {
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if (data->payload_len[1] == 0)
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return true;
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if (MATCHSTR(data->payload[1], "\x16\xfe\xfd\x00"))
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return true;
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}
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if (MATCHSTR(data->payload[1], "\x16\xfe\xfd\x00")) {
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if (data->payload_len[0] == 0)
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return true;
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if (MATCHSTR(data->payload[1], "\x16\xfe\xfd\x00"))
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return true;
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}
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/* This is probably Google Duo -- consider separate protocol? */
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if (MATCHSTR(data->payload[0], "\x17\xfe\xfd\x00")) {
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if (MATCHSTR(data->payload[1], "\x17\xfe\xfd\x00"))
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return true;
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}
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return false;
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}
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static lpi_module_t lpi_dtls = {
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LPI_PROTO_UDP_DTLS,
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LPI_CATEGORY_ENCRYPT,
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"DTLS",
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100,
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match_dtls
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};
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void register_dtls(LPIModuleMap *mod_map) {
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register_protocol(&lpi_dtls, mod_map);
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}
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