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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_code 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-code.h"
#include "stream-tcp-private.h"
#include "stream-tcp.h"
static int DetectHttpStatCodeSetup(DetectEngineCtx *, Signature *, const char *);
static int DetectHttpStatCodeSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str);
#ifdef UNITTESTS
static void DetectHttpStatCodeRegisterTests(void);
#endif
static int g_http_stat_code_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 InspectionBuffer *GetData2(DetectEngineThreadCtx *det_ctx,
const DetectEngineTransforms *transforms, Flow *_f, const uint8_t _flow_flags, void *txv,
const int list_id);
/**
* \brief Registration function for keyword: http_stat_code
*/
void DetectHttpStatCodeRegister (void)
{
/* http_stat_code content modifier */
sigmatch_table[DETECT_AL_HTTP_STAT_CODE].name = "http_stat_code";
sigmatch_table[DETECT_AL_HTTP_STAT_CODE].desc = "content modifier to match only on HTTP stat-code-buffer";
sigmatch_table[DETECT_AL_HTTP_STAT_CODE].url = "/rules/http-keywords.html#http-stat-code";
sigmatch_table[DETECT_AL_HTTP_STAT_CODE].Setup = DetectHttpStatCodeSetup;
#ifdef UNITTESTS
sigmatch_table[DETECT_AL_HTTP_STAT_CODE].RegisterTests = DetectHttpStatCodeRegisterTests;
#endif
sigmatch_table[DETECT_AL_HTTP_STAT_CODE].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_CONTENT_MODIFIER;
sigmatch_table[DETECT_AL_HTTP_STAT_CODE].alternative = DETECT_HTTP_STAT_CODE;
/* http.stat_code content modifier */
sigmatch_table[DETECT_HTTP_STAT_CODE].name = "http.stat_code";
sigmatch_table[DETECT_HTTP_STAT_CODE].desc = "sticky buffer to match only on HTTP stat-code-buffer";
sigmatch_table[DETECT_HTTP_STAT_CODE].url = "/rules/http-keywords.html#http-stat-code";
sigmatch_table[DETECT_HTTP_STAT_CODE].Setup = DetectHttpStatCodeSetupSticky;
sigmatch_table[DETECT_HTTP_STAT_CODE].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_STICKY_BUFFER;
DetectAppLayerInspectEngineRegister2("http_stat_code", ALPROTO_HTTP1, SIG_FLAG_TOCLIENT,
HTP_RESPONSE_LINE, DetectEngineInspectBufferGeneric, GetData);
DetectAppLayerMpmRegister2("http_stat_code", SIG_FLAG_TOCLIENT, 4, PrefilterGenericMpmRegister,
GetData, ALPROTO_HTTP1, HTP_RESPONSE_LINE);
DetectAppLayerInspectEngineRegister2("http_stat_code", ALPROTO_HTTP2, SIG_FLAG_TOCLIENT,
HTTP2StateDataServer, DetectEngineInspectBufferGeneric, GetData2);
DetectAppLayerMpmRegister2("http_stat_code", SIG_FLAG_TOCLIENT, 4, PrefilterGenericMpmRegister,
GetData2, ALPROTO_HTTP2, HTTP2StateDataServer);
DetectBufferTypeSetDescriptionByName("http_stat_code",
"http response status code");
g_http_stat_code_buffer_id = DetectBufferTypeGetByName("http_stat_code");
}
/**
* \brief this function setups the http_stat_code 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 DetectHttpStatCodeSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
{
return DetectEngineContentModifierBufferSetup(
de_ctx, s, arg, DETECT_AL_HTTP_STAT_CODE, g_http_stat_code_buffer_id, ALPROTO_HTTP1);
}
/**
* \brief this function setup the http.stat_code 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 DetectHttpStatCodeSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str)
{
if (DetectBufferSetActiveList(de_ctx, s, g_http_stat_code_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_status == NULL)
return NULL;
const uint32_t data_len = bstr_len(tx->response_status);
const uint8_t *data = bstr_ptr(tx->response_status);
InspectionBufferSetup(det_ctx, list_id, buffer, data, data_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
static InspectionBuffer *GetData2(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) {
uint32_t b_len = 0;
const uint8_t *b = NULL;
if (rs_http2_tx_get_status(txv, &b, &b_len) != 1)
return NULL;
if (b == NULL || b_len == 0)
return NULL;
InspectionBufferSetup(det_ctx, list_id, buffer, b, b_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
#ifdef UNITTESTS
#include "tests/detect-http-stat-code.c"
#endif /* UNITTESTS */
/**
* @}
*/
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