111 lines
3.3 KiB
C++
111 lines
3.3 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_ftp_reply_code(uint32_t payload, uint32_t len) {
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if (len == 0)
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return true;
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if (MATCHSTR(payload, "220 "))
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return true;
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if (MATCHSTR(payload, "220-"))
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return true;
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return false;
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}
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static inline bool match_ftp_command(uint32_t payload, uint32_t len) {
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if (len == 0)
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return true;
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/* There are lots of valid FTP commands, but let's just limit this
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* to ones we've observed for now */
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if (MATCHSTR(payload, "USER"))
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return true;
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if (MATCHSTR(payload, "QUIT"))
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return true;
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if (MATCHSTR(payload, "FEAT"))
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return true;
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if (MATCHSTR(payload, "HELP"))
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return true;
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if (MATCHSTR(payload, "user"))
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return true;
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if (MATCHSTR(payload, "AUTH"))
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return true;
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/* This is invalid syntax, but clients using HOST seem to revert to
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* sane FTP commands once the server reports a syntax error */
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if (MATCHSTR(payload, "HOST"))
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return true;
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return false;
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}
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static inline bool match_ftp_control(lpi_data_t *data,
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lpi_module_t *mod UNUSED) {
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/*https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol*/
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/* Rule out SMTP which uses similar reply codes and commands */
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if (data->server_port == 25 || data->client_port == 25 ||
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data->server_port == 587 || data->client_port == 587 ||
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data->server_port == 110 || data->client_port == 110 ||
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data->server_port == 143 || data->client_port == 143)
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return false;
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if (match_ftp_reply_code(data->payload[0], data->payload_len[0])) {
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if (match_ftp_command(data->payload[1], data->payload_len[1]))
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return true;
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}
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if (match_ftp_reply_code(data->payload[1], data->payload_len[1])) {
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if (match_ftp_command(data->payload[0], data->payload_len[0]))
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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_ftpcontrol = {
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LPI_PROTO_FTP_CONTROL,
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LPI_CATEGORY_FILES,
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"FTP_Control",
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3,
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match_ftp_control
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};
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void register_ftpcontrol(LPIModuleMap *mod_map) {
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register_protocol(&lpi_ftpcontrol, mod_map);
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}
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