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/* Copyright (C) 2007-2019 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.
*/
/**
* Stub for per HTTP header detection keyword. Meant to be included into
* a C file.
*/
/**
* \ingroup httplayer
*
* @{
*/
#include "suricata-common.h"
#include "flow.h"
#include <htp/htp.h>
#include "detect.h"
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-engine-mpm.h"
#include "detect-engine-prefilter.h"
#include "util-debug.h"
#include "rust.h"
static int g_buffer_id = 0;
#ifdef KEYWORD_TOSERVER
static InspectionBuffer *GetRequestData(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->request_headers == NULL)
return NULL;
htp_header_t *h = (htp_header_t *)htp_table_get_c(tx->request_headers,
HEADER_NAME);
if (h == NULL || h->value == NULL) {
SCLogDebug("HTTP %s header not present in this request",
HEADER_NAME);
return NULL;
}
const uint32_t data_len = bstr_len(h->value);
const uint8_t *data = bstr_ptr(h->value);
InspectionBufferSetup(det_ctx, list_id, buffer, data, data_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
static InspectionBuffer *GetRequestData2(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_header_value(txv, STREAM_TOSERVER, HEADER_NAME, &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;
}
#endif
#ifdef KEYWORD_TOCLIENT
static InspectionBuffer *GetResponseData(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_headers == NULL)
return NULL;
htp_header_t *h = (htp_header_t *)htp_table_get_c(tx->response_headers,
HEADER_NAME);
if (h == NULL || h->value == NULL) {
SCLogDebug("HTTP %s header not present in this request",
HEADER_NAME);
return NULL;
}
const uint32_t data_len = bstr_len(h->value);
const uint8_t *data = bstr_ptr(h->value);
InspectionBufferSetup(det_ctx, list_id, buffer, data, data_len);
InspectionBufferApplyTransforms(buffer, transforms);
}
return buffer;
}
static InspectionBuffer *GetResponseData2(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_header_value(txv, STREAM_TOCLIENT, HEADER_NAME, &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;
}
#endif
/**
* \brief this function setup the http.header 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 DetectHttpHeadersSetupSticky(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;
return 0;
}
static void DetectHttpHeadersRegisterStub(void)
{
sigmatch_table[KEYWORD_ID].name = KEYWORD_NAME;
#ifdef KEYWORD_NAME_LEGACY
sigmatch_table[KEYWORD_ID].alias = KEYWORD_NAME_LEGACY;
#endif
sigmatch_table[KEYWORD_ID].desc = KEYWORD_NAME " sticky buffer for the " BUFFER_DESC;
sigmatch_table[KEYWORD_ID].url = "/rules/" KEYWORD_DOC;
sigmatch_table[KEYWORD_ID].Setup = DetectHttpHeadersSetupSticky;
sigmatch_table[KEYWORD_ID].flags |= SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER;
#ifdef KEYWORD_TOSERVER
DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
GetRequestData, ALPROTO_HTTP1, HTP_REQUEST_HEADERS);
DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
GetRequestData2, ALPROTO_HTTP2, HTTP2StateDataClient);
#endif
#ifdef KEYWORD_TOCLIENT
DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOCLIENT, 2, PrefilterGenericMpmRegister,
GetResponseData, ALPROTO_HTTP1, HTP_RESPONSE_HEADERS);
DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOCLIENT, 2, PrefilterGenericMpmRegister,
GetResponseData2, ALPROTO_HTTP2, HTTP2StateDataServer);
#endif
#ifdef KEYWORD_TOSERVER
DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_HTTP1, SIG_FLAG_TOSERVER,
HTP_REQUEST_HEADERS, DetectEngineInspectBufferGeneric, GetRequestData);
DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_HTTP2, SIG_FLAG_TOSERVER,
HTTP2StateDataClient, DetectEngineInspectBufferGeneric, GetRequestData2);
#endif
#ifdef KEYWORD_TOCLIENT
DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_HTTP1, SIG_FLAG_TOCLIENT,
HTP_RESPONSE_HEADERS, DetectEngineInspectBufferGeneric, GetResponseData);
DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_HTTP2, SIG_FLAG_TOCLIENT,
HTTP2StateDataServer, DetectEngineInspectBufferGeneric, GetResponseData2);
#endif
DetectBufferTypeSetDescriptionByName(BUFFER_NAME, BUFFER_DESC);
g_buffer_id = DetectBufferTypeGetByName(BUFFER_NAME);
}
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