77 lines
2.4 KiB
C++
77 lines
2.4 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 inline bool match_isakmp(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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/* Rule out anything not on UDP port 500 */
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if (data->server_port != 500 && data->client_port != 500)
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return false;
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/* Catching one-way ISAKMP is hard, we have to rely on port numbers
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* because nothing else is consistent :( */
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if (data->payload_len[0] == 0 || data->payload_len[1] == 0) {
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if (data->server_port == 500 && data->client_port == 500)
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return true;
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/* Match shadowserver.org scan traffic */
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if (MATCH(data->payload[0], 0x3e, 0x35, 0xc7, 0x07))
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return true;
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if (MATCH(data->payload[1], 0x3e, 0x35, 0xc7, 0x07))
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return true;
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return false;
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}
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/* First four bytes are the cookie for the initiator, so should match
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* in both directions */
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if (data->payload[0] != data->payload[1])
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return false;
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if (data->payload_len[0] < 4 && data->payload_len[1] < 4)
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return false;
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return true;
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}
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static lpi_module_t lpi_isakmp = {
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LPI_PROTO_UDP_ISAKMP,
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LPI_CATEGORY_KEY_EXCHANGE,
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"ISAKMP",
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6,
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match_isakmp
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};
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void register_isakmp(LPIModuleMap *mod_map) {
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register_protocol(&lpi_isakmp, mod_map);
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}
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