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109 lines
3.2 KiB
C
109 lines
3.2 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.reply 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-helper.h"
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#include "detect-engine-content-inspection.h"
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#include "detect-ftp-reply.h"
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#include "app-layer.h"
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#include "app-layer-ftp.h"
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#include "flow.h"
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#include "util-debug.h"
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#include "rust.h"
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#define KEYWORD_NAME "ftp.reply"
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#define KEYWORD_DOC "ftp-keywords.html#ftp-reply"
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#define BUFFER_NAME "ftp.reply"
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#define BUFFER_DESC "ftp reply"
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static int g_ftp_reply_buffer_id = 0;
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static int DetectFtpReplySetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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if (SCDetectBufferSetActiveList(de_ctx, s, g_ftp_reply_buffer_id) < 0)
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return -1;
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if (SCDetectSignatureSetAppProto(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 DetectFTPReplyGetData(DetectEngineThreadCtx *_det_ctx, const void *txv,
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uint8_t _flow_flags, uint32_t index, 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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if (!TAILQ_EMPTY(&tx->response_list)) {
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uint32_t count = 0;
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FTPResponseWrapper *wrapper;
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TAILQ_FOREACH (wrapper, &tx->response_list, next) {
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DEBUG_VALIDATE_BUG_ON(wrapper->response == NULL);
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if (index == count) {
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*buffer = (const uint8_t *)wrapper->response->response;
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*buffer_len = (uint32_t)wrapper->response->length;
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return true;
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}
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count++;
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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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void DetectFtpReplyRegister(void)
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{
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/* ftp.reply sticky buffer */
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sigmatch_table[DETECT_FTP_REPLY].name = KEYWORD_NAME;
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sigmatch_table[DETECT_FTP_REPLY].desc = "sticky buffer to match on the FTP reply buffer";
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sigmatch_table[DETECT_FTP_REPLY].url = "/rules/" KEYWORD_DOC;
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sigmatch_table[DETECT_FTP_REPLY].Setup = DetectFtpReplySetup;
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sigmatch_table[DETECT_FTP_REPLY].flags |=
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SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER | SIGMATCH_INFO_MULTI_BUFFER;
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DetectAppLayerMultiRegister(
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BUFFER_NAME, ALPROTO_FTP, SIG_FLAG_TOCLIENT, 1, DetectFTPReplyGetData, 2);
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DetectBufferTypeSetDescriptionByName(BUFFER_NAME, BUFFER_DESC);
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g_ftp_reply_buffer_id = DetectBufferTypeGetByName(BUFFER_NAME);
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SCLogDebug("registering " BUFFER_NAME " rule option");
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}
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