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116 lines
3.6 KiB
C
116 lines
3.6 KiB
C
/* Copyright (C) 2025 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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*
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* \author Jeff Lucovsky <jlucovsky@oisf.net>
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*
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* Implements the ftp.command_data sticky buffer
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*
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*/
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#include "suricata-common.h"
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#include "detect.h"
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#include "detect-parse.h"
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#include "detect-engine.h"
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#include "detect-engine-buffer.h"
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#include "detect-engine-mpm.h"
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#include "detect-engine-prefilter.h"
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#include "detect-engine-helper.h"
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#include "detect-content.h"
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#include "flow.h"
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#include "util-debug.h"
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#include "app-layer.h"
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#include "app-layer-ftp.h"
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#include "detect-ftp-command-data.h"
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#define KEYWORD_NAME "ftp.command_data"
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#define KEYWORD_DOC "ftp-keywords.html#ftp-command_data"
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#define BUFFER_NAME "ftp.command_data"
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#define BUFFER_DESC "ftp command_data"
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static int g_ftp_cmd_data_buffer_id = 0;
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static int DetectFtpCommandDataSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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if (SCDetectBufferSetActiveList(de_ctx, s, g_ftp_cmd_data_buffer_id) < 0)
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return -1;
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if (DetectSignatureSetAppProto(s, ALPROTO_FTP) < 0)
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return -1;
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return 0;
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}
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static bool DetectFTPCommandDataGetData(
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void *txv, const uint8_t _flow_flags, const uint8_t **buffer, uint32_t *buffer_len)
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{
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FTPTransaction *tx = (FTPTransaction *)txv;
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if (tx->command_descriptor.command_code == FTP_COMMAND_UNKNOWN)
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return false;
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const char *b;
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uint8_t b_len;
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if (SCGetFtpCommandInfo(tx->command_descriptor.command_index, &b, NULL, &b_len)) {
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if ((tx->request_length - b_len - 1) > 0) {
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// command data starts here: advance past command + 1 space
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*buffer = tx->request + b_len + 1;
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*buffer_len = tx->request_length - b_len - 1;
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SCLogDebug("command data: \"%s\" [bytes %d]", *buffer, *buffer_len);
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return true;
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}
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}
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*buffer = NULL;
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*buffer_len = 0;
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return false;
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}
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static InspectionBuffer *GetDataWrapper(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *_f, const uint8_t _flow_flags, void *txv,
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const int list_id)
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{
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return DetectHelperGetData(
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det_ctx, transforms, _f, _flow_flags, txv, list_id, DetectFTPCommandDataGetData);
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}
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void DetectFtpCommandDataRegister(void)
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{
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/* ftp.command sticky buffer */
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sigmatch_table[DETECT_FTP_COMMAND_DATA].name = KEYWORD_NAME;
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sigmatch_table[DETECT_FTP_COMMAND_DATA].desc =
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"sticky buffer to match on the FTP command data buffer";
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sigmatch_table[DETECT_FTP_COMMAND_DATA].url = "/rules/" KEYWORD_DOC;
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sigmatch_table[DETECT_FTP_COMMAND_DATA].Setup = DetectFtpCommandDataSetup;
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sigmatch_table[DETECT_FTP_COMMAND_DATA].flags |= SIGMATCH_NOOPT;
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DetectHelperBufferMpmRegister(
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BUFFER_NAME, BUFFER_NAME, ALPROTO_FTP, STREAM_TOSERVER, GetDataWrapper);
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DetectBufferTypeSetDescriptionByName(BUFFER_NAME, BUFFER_DESC);
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g_ftp_cmd_data_buffer_id = DetectBufferTypeGetByName(BUFFER_NAME);
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SCLogDebug("registering " BUFFER_NAME " rule option");
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}
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