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/* Copyright (C) 2007-2022 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 Victor Julien <victor@inliniac.net>
*
* Implements support for the http_response_line 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-mpm.h"
#include "detect-engine-state.h"
#include "detect-engine-prefilter.h"
#include "detect-engine-content-inspection.h"
#include "detect-content.h"
#include "detect-pcre.h"
#include "flow.h"
#include "flow-var.h"
#include "flow-util.h"
#include "util-debug.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"
#include "util-spm.h"
#include "app-layer.h"
#include "app-layer-parser.h"
#include "app-layer-htp.h"
#include "stream-tcp.h"
#include "detect-http-response-line.h"
static int DetectHttpResponseLineSetup(DetectEngineCtx *, Signature *, const char *);
#ifdef UNITTESTS
static void DetectHttpResponseLineRegisterTests(void);
#endif
static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
const DetectEngineTransforms *transforms,
Flow *_f, const uint8_t _flow_flags,
void *txv, const int list_id);
static int g_http_response_line_id = 0;
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_response_line(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;
}
/**
* \brief Registers the keyword handlers for the "http_response_line" keyword.
*/
void DetectHttpResponseLineRegister(void)
{
sigmatch_table[DETECT_AL_HTTP_RESPONSE_LINE].name = "http.response_line";
sigmatch_table[DETECT_AL_HTTP_RESPONSE_LINE].alias = "http_response_line";
sigmatch_table[DETECT_AL_HTTP_RESPONSE_LINE].desc = "content modifier to match only on the HTTP response line";
sigmatch_table[DETECT_AL_HTTP_RESPONSE_LINE].url = "/rules/http-keywords.html#http-response-line";
sigmatch_table[DETECT_AL_HTTP_RESPONSE_LINE].Setup = DetectHttpResponseLineSetup;
#ifdef UNITTESTS
sigmatch_table[DETECT_AL_HTTP_RESPONSE_LINE].RegisterTests = DetectHttpResponseLineRegisterTests;
#endif
sigmatch_table[DETECT_AL_HTTP_RESPONSE_LINE].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_STICKY_BUFFER;
DetectAppLayerInspectEngineRegister2("http_response_line", ALPROTO_HTTP1, SIG_FLAG_TOCLIENT,
HTP_RESPONSE_LINE, DetectEngineInspectBufferGeneric, GetData);
DetectAppLayerMpmRegister2("http_response_line", SIG_FLAG_TOCLIENT, 2,
PrefilterGenericMpmRegister, GetData, ALPROTO_HTTP1, HTP_RESPONSE_LINE);
DetectAppLayerInspectEngineRegister2("http_response_line", ALPROTO_HTTP2, SIG_FLAG_TOCLIENT,
HTTP2StateDataServer, DetectEngineInspectBufferGeneric, GetData2);
DetectAppLayerMpmRegister2("http_response_line", SIG_FLAG_TOCLIENT, 2,
PrefilterGenericMpmRegister, GetData2, ALPROTO_HTTP2, HTTP2StateDataServer);
DetectBufferTypeSetDescriptionByName("http_response_line",
"http response line");
g_http_response_line_id = DetectBufferTypeGetByName("http_response_line");
}
/**
* \brief The setup function for the http_response_line keyword for a signature.
*
* \param de_ctx Pointer to the detection engine context.
* \param s Pointer to the signature for the current Signature being
* parsed from the rules.
* \param m Pointer to the head of the SigMatch for the current rule
* being parsed.
* \param arg Pointer to the string holding the keyword value.
*
* \retval 0 On success
* \retval -1 On failure
*/
static int DetectHttpResponseLineSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
{
if (DetectBufferSetActiveList(de_ctx, s, g_http_response_line_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)
{
InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
if (buffer->inspect == NULL) {
htp_tx_t *tx = (htp_tx_t *)txv;
if (unlikely(tx->response_line == NULL)) {
return NULL;
}
const uint32_t data_len = bstr_len(tx->response_line);
const uint8_t *data = bstr_ptr(tx->response_line);
InspectionBufferSetup(det_ctx, list_id, buffer, data, data_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
/************************************Unittests*********************************/
#ifdef UNITTESTS
#include "stream-tcp-reassemble.h"
/**
* \test Test that a signature containing a http_response_line is correctly parsed
* and the keyword is registered.
*/
static int DetectHttpResponseLineTest01(void)
{
DetectEngineCtx *de_ctx = DetectEngineCtxInit();
FAIL_IF_NULL(de_ctx);
de_ctx->flags |= DE_QUIET;
de_ctx->sig_list = SigInit(de_ctx, "alert tcp any any -> any any "
"(http_response_line; content:\"200 OK\"; sid:1;)");
FAIL_IF_NULL(de_ctx->sig_list);
DetectEngineCtxFree(de_ctx);
PASS;
}
void DetectHttpResponseLineRegisterTests(void)
{
UtRegisterTest("DetectHttpResponseLineTest01", DetectHttpResponseLineTest01);
}
#endif /* UNITTESTS */
/**
* @}
*/
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