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/* Copyright (C) 2007-2018 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 Gurvinder Singh <gurvindersinghdahiya@gmail.com>
* \author Anoop Saldanha <anoopsaldanha@gmail.com>
*
* Implements the http_stat_msg keyword
*/
#include "suricata-common.h"
#include "threads.h"
#include "decode.h"
#include "detect.h"
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-content.h"
#include "detect-pcre.h"
#include "detect-engine-mpm.h"
#include "detect-engine-prefilter.h"
#include "flow.h"
#include "flow-var.h"
#include "flow-util.h"
#include "util-debug.h"
#include "util-error.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "util-spm.h"
#include "util-print.h"
#include "app-layer.h"
#include "app-layer-parser.h"
#include "app-layer-htp.h"
#include "detect-http-stat-msg.h"
#include "stream-tcp-private.h"
#include "stream-tcp.h"
static int DetectHttpStatMsgSetup(DetectEngineCtx *, Signature *, const char *);
#ifdef UNITTESTS
static void DetectHttpStatMsgRegisterTests(void);
#endif
static int g_http_stat_msg_buffer_id = 0;
static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
const DetectEngineTransforms *transforms, Flow *_f,
const uint8_t _flow_flags, void *txv, const int list_id);
static int DetectHttpStatMsgSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str);
static InspectionBuffer *GetData2(DetectEngineThreadCtx *det_ctx,
const DetectEngineTransforms *transforms, Flow *_f, const uint8_t _flow_flags, void *txv,
const int list_id)
{
InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
if (buffer->inspect == NULL) {
InspectionBufferSetup(det_ctx, list_id, buffer, (const uint8_t *)"", 0);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
/**
* \brief Registration function for keyword: http_stat_msg
*/
void DetectHttpStatMsgRegister (void)
{
/* http_stat_msg content modifier */
sigmatch_table[DETECT_AL_HTTP_STAT_MSG].name = "http_stat_msg";
sigmatch_table[DETECT_AL_HTTP_STAT_MSG].desc = "content modifier to match on HTTP stat-msg-buffer";
sigmatch_table[DETECT_AL_HTTP_STAT_MSG].url = "/rules/http-keywords.html#http-stat-msg";
sigmatch_table[DETECT_AL_HTTP_STAT_MSG].Setup = DetectHttpStatMsgSetup;
#ifdef UNITTESTS
sigmatch_table[DETECT_AL_HTTP_STAT_MSG].RegisterTests = DetectHttpStatMsgRegisterTests;
#endif
sigmatch_table[DETECT_AL_HTTP_STAT_MSG].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_CONTENT_MODIFIER;
sigmatch_table[DETECT_AL_HTTP_STAT_MSG].alternative = DETECT_HTTP_STAT_MSG;
/* http.stat_msg sticky buffer */
sigmatch_table[DETECT_HTTP_STAT_MSG].name = "http.stat_msg";
sigmatch_table[DETECT_HTTP_STAT_MSG].desc = "sticky buffer to match on the HTTP response status message";
sigmatch_table[DETECT_HTTP_STAT_MSG].url = "/rules/http-keywords.html#http-stat-msg";
sigmatch_table[DETECT_HTTP_STAT_MSG].Setup = DetectHttpStatMsgSetupSticky;
sigmatch_table[DETECT_HTTP_STAT_MSG].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_STICKY_BUFFER;
DetectAppLayerInspectEngineRegister2("http_stat_msg", ALPROTO_HTTP1, SIG_FLAG_TOCLIENT,
HTP_RESPONSE_LINE, DetectEngineInspectBufferGeneric, GetData);
DetectAppLayerMpmRegister2("http_stat_msg", SIG_FLAG_TOCLIENT, 3, PrefilterGenericMpmRegister,
GetData, ALPROTO_HTTP1, HTP_RESPONSE_LINE);
DetectAppLayerInspectEngineRegister2("http_stat_msg", ALPROTO_HTTP2, SIG_FLAG_TOCLIENT,
HTTP2StateDataServer, DetectEngineInspectBufferGeneric, GetData2);
DetectAppLayerMpmRegister2("http_stat_msg", SIG_FLAG_TOCLIENT, 2, PrefilterGenericMpmRegister,
GetData2, ALPROTO_HTTP2, HTTP2StateDataServer);
DetectBufferTypeSetDescriptionByName("http_stat_msg",
"http response status message");
g_http_stat_msg_buffer_id = DetectBufferTypeGetByName("http_stat_msg");
}
/**
* \brief this function setups the http_stat_msg modifier 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
* \retval -1 On failure
*/
static int DetectHttpStatMsgSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
{
return DetectEngineContentModifierBufferSetup(
de_ctx, s, arg, DETECT_AL_HTTP_STAT_MSG, g_http_stat_msg_buffer_id, ALPROTO_HTTP1);
}
/**
* \brief this function setup the http.stat_msg 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 DetectHttpStatMsgSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str)
{
if (DetectBufferSetActiveList(de_ctx, s, g_http_stat_msg_buffer_id) < 0)
return -1;
if (DetectSignatureSetAppProto(s, ALPROTO_HTTP) < 0)
return -1;
return 0;
}
static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
const DetectEngineTransforms *transforms, Flow *_f,
const uint8_t _flow_flags, void *txv, const int list_id)
{
SCEnter();
InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
if (buffer->inspect == NULL) {
htp_tx_t *tx = (htp_tx_t *)txv;
if (tx->response_message == NULL)
return NULL;
const uint32_t data_len = bstr_len(tx->response_message);
const uint8_t *data = bstr_ptr(tx->response_message);
InspectionBufferSetup(det_ctx, list_id, buffer, data, data_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
#ifdef UNITTESTS
#include "tests/detect-http-stat-msg.c"
#endif /* UNITTESTS */
/**
* @}
*/
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