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/* Copyright (C) 2007-2023 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \ingroup httplayer
*
* @{
*/
/**
* \file
*
* \author Anoop Saldanha <anoopsaldanha@gmail.com>
* \author Victor Julien <victor@inliniac.net>
*
* Implements support for the http_server_body keyword
*/
#include "suricata-common.h"
#include "threads.h"
#include "decode.h"
#include "detect.h"
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-engine-content-inspection.h"
#include "detect-content.h"
#include "flow.h"
#include "flow-util.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "util-profiling.h"
#include "app-layer.h"
#include "app-layer-parser.h"
#include "app-layer-htp.h"
#include "detect-http-server-body.h"
#include "stream-tcp.h"
static int DetectHttpServerBodySetup(DetectEngineCtx *, Signature *, const char *);
static int DetectHttpServerBodySetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str);
#ifdef UNITTESTS
static void DetectHttpServerBodyRegisterTests(void);
#endif
static int g_buffer_id = 0;
/**
* \brief Registers the keyword handlers for the "http_server_body" keyword.
*/
void DetectHttpServerBodyRegister(void)
{
/* http_server_body content modifier */
sigmatch_table[DETECT_AL_HTTP_SERVER_BODY].name = "http_server_body";
sigmatch_table[DETECT_AL_HTTP_SERVER_BODY].desc = "content modifier to match on the HTTP response-body";
sigmatch_table[DETECT_AL_HTTP_SERVER_BODY].url = "/rules/http-keywords.html#http-server-body";
sigmatch_table[DETECT_AL_HTTP_SERVER_BODY].Setup = DetectHttpServerBodySetup;
#ifdef UNITTESTS
sigmatch_table[DETECT_AL_HTTP_SERVER_BODY].RegisterTests = DetectHttpServerBodyRegisterTests;
#endif
sigmatch_table[DETECT_AL_HTTP_SERVER_BODY].flags |= SIGMATCH_NOOPT;
sigmatch_table[DETECT_AL_HTTP_SERVER_BODY].flags |= SIGMATCH_INFO_CONTENT_MODIFIER;
sigmatch_table[DETECT_AL_HTTP_SERVER_BODY].alternative = DETECT_HTTP_RESPONSE_BODY;
/* http.request_body sticky buffer */
sigmatch_table[DETECT_HTTP_RESPONSE_BODY].name = "http.response_body";
sigmatch_table[DETECT_HTTP_RESPONSE_BODY].desc = "sticky buffer to match the HTTP response body buffer";
sigmatch_table[DETECT_HTTP_RESPONSE_BODY].url = "/rules/http-keywords.html#http-server-body";
sigmatch_table[DETECT_HTTP_RESPONSE_BODY].Setup = DetectHttpServerBodySetupSticky;
sigmatch_table[DETECT_HTTP_RESPONSE_BODY].flags |= SIGMATCH_NOOPT;
sigmatch_table[DETECT_HTTP_RESPONSE_BODY].flags |= SIGMATCH_INFO_STICKY_BUFFER;
g_buffer_id = DetectBufferTypeRegister("file_data");
}
/**
* \brief The setup function for the http_server_body keyword for a signature.
*
* \param de_ctx Pointer to the detection engine context.
* \param s Pointer to signature for the current Signature being parsed
* from the rules.
* \param m Pointer to the head of the SigMatchs for the current rule
* being parsed.
* \param arg Pointer to the string holding the keyword value.
*
* \retval 0 On success
* \retval -1 On failure
*/
int DetectHttpServerBodySetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
{
return DetectEngineContentModifierBufferSetup(
de_ctx, s, arg, DETECT_AL_HTTP_SERVER_BODY, g_buffer_id, ALPROTO_HTTP1);
}
/**
* \brief this function setup the http.response_body keyword used in the rule
*
* \param de_ctx Pointer to the Detection Engine Context
* \param s Pointer to the Signature to which the current keyword belongs
* \param str Should hold an empty string always
*
* \retval 0 On success
*/
static int DetectHttpServerBodySetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str)
{
if (DetectBufferSetActiveList(de_ctx, s, g_buffer_id) < 0)
return -1;
if (DetectSignatureSetAppProto(s, ALPROTO_HTTP) < 0)
return -1;
// file data is on both directions, but we only take the one to client here
s->flags |= SIG_FLAG_TOCLIENT;
s->flags &= ~SIG_FLAG_TOSERVER;
return 0;
}
/************************************Unittests*********************************/
#ifdef UNITTESTS
#include "tests/detect-http-server-body.c"
#endif /* UNITTESTS */
/**
* @}
*/
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