102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
/*
|
|
*
|
|
* Copyright (c) 2011-2016 The University of Waikato, Hamilton, New Zealand.
|
|
* All rights reserved.
|
|
*
|
|
* This file is part of libprotoident.
|
|
*
|
|
* This code has been developed by the University of Waikato WAND
|
|
* research group. For further information please see http://www.wand.net.nz/
|
|
*
|
|
* libprotoident is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published by
|
|
* the Free Software Foundation; either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* libprotoident is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
|
|
#include "libprotoident.h"
|
|
#include "proto_manager.h"
|
|
#include "proto_common.h"
|
|
|
|
/* BMDP is a protocol used by Microsoft Automated Deployment Services, a
|
|
* system for remotely installing, configuring and maintained Windows Servers.
|
|
*
|
|
* Unfortunately, there is no obvious BMDP spec out there so this is just
|
|
* based on what we have seen in our traffic.
|
|
*/
|
|
|
|
static inline bool match_bmdp_payload(uint32_t payload, uint32_t len) {
|
|
uint32_t byte3 = ntohl(payload) & 0xff00;
|
|
uint32_t byte4 = ntohl(payload) & 0x00ff;
|
|
|
|
if (len == 0)
|
|
return false;
|
|
|
|
/* Byte 3 is always Xd, where X >=0 and X < 8 */
|
|
if ((ntohl(payload) & 0x7d00) != byte3)
|
|
return false;
|
|
|
|
/* There seem to be a fixed set of values for byte 4 and these seem
|
|
* to also determine the length.
|
|
*
|
|
* So far I've limited this to byte4's that I've seen on multiple
|
|
* occasions.
|
|
*/
|
|
if (byte4 == 0x2d && (len == 115 || len == 114))
|
|
return true;
|
|
|
|
if (byte4 == 0x42 && len == 116)
|
|
return true;
|
|
|
|
if (byte4 == 0x5c && len == 117)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline bool match_bmdp(lpi_data_t *data, lpi_module_t *mod UNUSED) {
|
|
|
|
/* XXX The typical port number is 8197, but usually you will see this
|
|
* on a port ranging from 8190 to 8210. We could consider limiting
|
|
* this rule to traffic matching those ports if we really wanted.
|
|
*/
|
|
|
|
/* Traffic is always one-way only */
|
|
if (data->payload_len[0] != 0 && data->payload_len[1] != 0)
|
|
return false;
|
|
|
|
if (match_bmdp_payload(data->payload[0], data->payload_len[0]))
|
|
return true;
|
|
|
|
if (match_bmdp_payload(data->payload[1], data->payload_len[1]))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static lpi_module_t lpi_bmdp = {
|
|
LPI_PROTO_UDP_BMDP,
|
|
LPI_CATEGORY_FILES,
|
|
"BMDP",
|
|
70,
|
|
match_bmdp
|
|
};
|
|
|
|
void register_bmdp(LPIModuleMap *mod_map) {
|
|
register_protocol(&lpi_bmdp, mod_map);
|
|
}
|
|
|