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/* Copyright (C) 2007-2017 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 http_protocol sticky buffer
*/
#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 "detect-http-header-common.h"
#include "detect-http-protocol.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 "util-print.h"
#include "app-layer.h"
#include "app-layer-parser.h"
#include "app-layer-htp.h"
#include "detect-http-header.h"
#include "stream-tcp.h"
#define KEYWORD_NAME "http.protocol"
#define KEYWORD_NAME_LEGACY "http_protocol"
#define KEYWORD_DOC "http-keywords.html#http-protocol"
#define BUFFER_NAME "http_protocol"
#define BUFFER_DESC "http protocol"
static int g_buffer_id = 0;
static int DetectHttpProtocolSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
{
if (DetectBufferSetActiveList(de_ctx, s, g_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)
{
InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
if (buffer->inspect == NULL) {
bstr *str = NULL;
htp_tx_t *tx = (htp_tx_t *)txv;
if (flow_flags & STREAM_TOSERVER)
str = tx->request_protocol;
else if (flow_flags & STREAM_TOCLIENT)
str = tx->response_protocol;
if (str == NULL) {
SCLogDebug("HTTP protocol not set");
return NULL;
}
uint32_t data_len = bstr_size(str);
uint8_t *data = bstr_ptr(str);
if (data == NULL || data_len == 0) {
SCLogDebug("HTTP protocol not present");
return NULL;
}
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)
{
InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
if (buffer->inspect == NULL) {
InspectionBufferSetup(
det_ctx, list_id, buffer, (const uint8_t *)"HTTP/2", strlen("HTTP/2"));
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
/**
* \brief Registers the keyword handlers for the "http.protocol" keyword.
*/
void DetectHttpProtocolRegister(void)
{
sigmatch_table[DETECT_AL_HTTP_PROTOCOL].name = KEYWORD_NAME;
sigmatch_table[DETECT_AL_HTTP_PROTOCOL].alias = KEYWORD_NAME_LEGACY;
sigmatch_table[DETECT_AL_HTTP_PROTOCOL].desc = BUFFER_NAME " sticky buffer";
sigmatch_table[DETECT_AL_HTTP_PROTOCOL].url = "/rules/" KEYWORD_DOC;
sigmatch_table[DETECT_AL_HTTP_PROTOCOL].Setup = DetectHttpProtocolSetup;
sigmatch_table[DETECT_AL_HTTP_PROTOCOL].flags |= SIGMATCH_INFO_STICKY_BUFFER | SIGMATCH_NOOPT;
DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
GetData, ALPROTO_HTTP1, HTP_REQUEST_LINE);
DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOCLIENT, 2, PrefilterGenericMpmRegister,
GetData, ALPROTO_HTTP1, HTP_RESPONSE_LINE);
DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_HTTP1, SIG_FLAG_TOSERVER,
HTP_REQUEST_LINE, DetectEngineInspectBufferGeneric, GetData);
DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_HTTP1, SIG_FLAG_TOCLIENT,
HTP_RESPONSE_LINE, DetectEngineInspectBufferGeneric, GetData);
DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_HTTP2, SIG_FLAG_TOSERVER,
HTTP2StateDataClient, DetectEngineInspectBufferGeneric, GetData2);
DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
GetData2, ALPROTO_HTTP2, HTTP2StateDataClient);
DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_HTTP2, SIG_FLAG_TOCLIENT,
HTTP2StateDataServer, DetectEngineInspectBufferGeneric, GetData2);
DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOCLIENT, 2, PrefilterGenericMpmRegister,
GetData2, ALPROTO_HTTP2, HTTP2StateDataServer);
DetectBufferTypeSetDescriptionByName(BUFFER_NAME,
BUFFER_DESC);
g_buffer_id = DetectBufferTypeGetByName(BUFFER_NAME);
}
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