109 lines
3.2 KiB
C++
109 lines
3.2 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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/* Apple Remote Desktop protocol, generally used to remotely manage Macs.
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* Probably shouldn't be seen on the Internet, particularly with the patterns
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* presented here as this was almost certainly a case where a Mac with remote
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* management enabled was being abused into performing an amplification attack.
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*
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* Of course, being Apple, there is no public documentation of this protocol
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* anywhere so it's pretty hard to write rules that cover legitimate uses of
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* this protocol.
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*/
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static inline bool match_ard_tiny_req(uint32_t payload, uint32_t len) {
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if (len == 5 && MATCH(payload, 0x00, 0x14, 0x00, 0x01)) {
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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 inline bool match_ard_large_resp(uint32_t payload, uint32_t len) {
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/* Match the case where the client doesn't reply (i.e. participate
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* in the amplification attack).
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*/
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if (len == 0) {
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return true;
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}
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/* All my examples were 1006 bytes, but that's just from one
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* specific machine */
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if (len < 1000) {
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return false;
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}
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if ((ntohl(payload) & 0x0000ffff) != len - 4) {
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return false;
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}
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if (MATCH(payload, 0x00, 0x01, ANY, ANY)) {
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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 inline bool match_ard(lpi_data_t *data, lpi_module_t *mod UNUSED) {
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if (data->server_port != 3283 && data->client_port != 3283) {
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return false;
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}
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if (match_ard_tiny_req(data->payload[0], data->payload_len[0])) {
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if (match_ard_large_resp(data->payload[1], data->payload_len[1])) {
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return true;
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}
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}
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if (match_ard_tiny_req(data->payload[1], data->payload_len[1])) {
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if (match_ard_large_resp(data->payload[0], 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_ard = {
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LPI_PROTO_UDP_ARD,
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LPI_CATEGORY_REMOTE,
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"ARD",
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20,
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match_ard
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};
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void register_ard(LPIModuleMap *mod_map) {
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register_protocol(&lpi_ard, mod_map);
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}
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