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/* Copyright (C) 2020 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.
*/
/**
*
* \author Frank Honza <frank.honza@dcso.de>
*/
#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-prefilter.h"
#include "detect-urilen.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 "detect-ike-spi.h"
#include "stream-tcp.h"
#include "rust.h"
#include "app-layer-ike.h"
#include "rust-bindings.h"
#define KEYWORD_NAME_INITIATOR "ike.init_spi"
#define KEYWORD_DOC_INITIATOR "ike-keywords.html#ike-init_spi";
#define BUFFER_NAME_INITIATOR "ike.init_spi"
#define BUFFER_DESC_INITIATOR "ike init spi"
#define KEYWORD_NAME_RESPONDER "ike.resp_spi"
#define KEYWORD_DOC_RESPONDER "ike-keywords.html#ike-resp_spi";
#define BUFFER_NAME_RESPONDER "ike.resp_spi"
#define BUFFER_DESC_RESPONDER "ike resp spi"
static int g_buffer_initiator_id = 0;
static int g_buffer_responder_id = 0;
static int DetectSpiInitiatorSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
{
if (DetectBufferSetActiveList(de_ctx, s, g_buffer_initiator_id) < 0)
return -1;
if (DetectSignatureSetAppProto(s, ALPROTO_IKE) < 0)
return -1;
return 0;
}
static int DetectSpiResponderSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
{
if (DetectBufferSetActiveList(de_ctx, s, g_buffer_responder_id) < 0)
return -1;
if (DetectSignatureSetAppProto(s, ALPROTO_IKE) < 0)
return -1;
return 0;
}
static InspectionBuffer *GetInitiatorData(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) {
const uint8_t *b = NULL;
uint32_t b_len = 0;
if (rs_ike_state_get_spi_initiator(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;
}
static InspectionBuffer *GetResponderData(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) {
const uint8_t *b = NULL;
uint32_t b_len = 0;
if (rs_ike_state_get_spi_responder(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;
}
void DetectIkeSpiRegister(void)
{
// register initiator
sigmatch_table[DETECT_AL_IKE_SPI_INITIATOR].name = KEYWORD_NAME_INITIATOR;
sigmatch_table[DETECT_AL_IKE_SPI_INITIATOR].url =
"/rules/" KEYWORD_DOC_INITIATOR sigmatch_table[DETECT_AL_IKE_SPI_INITIATOR].desc =
"sticky buffer to match on the IKE spi initiator";
sigmatch_table[DETECT_AL_IKE_SPI_INITIATOR].Setup = DetectSpiInitiatorSetup;
sigmatch_table[DETECT_AL_IKE_SPI_INITIATOR].flags |=
SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER;
DetectAppLayerInspectEngineRegister2(BUFFER_NAME_INITIATOR, ALPROTO_IKE, SIG_FLAG_TOSERVER, 1,
DetectEngineInspectBufferGeneric, GetInitiatorData);
DetectAppLayerMpmRegister2(BUFFER_NAME_INITIATOR, SIG_FLAG_TOSERVER, 1,
PrefilterGenericMpmRegister, GetInitiatorData, ALPROTO_IKE, 1);
DetectBufferTypeSetDescriptionByName(BUFFER_NAME_INITIATOR, BUFFER_DESC_INITIATOR);
g_buffer_initiator_id = DetectBufferTypeGetByName(BUFFER_NAME_INITIATOR);
SCLogDebug("registering " BUFFER_NAME_INITIATOR " rule option");
// register responder
sigmatch_table[DETECT_AL_IKE_SPI_RESPONDER].name = KEYWORD_NAME_RESPONDER;
sigmatch_table[DETECT_AL_IKE_SPI_RESPONDER].url =
"/rules/" KEYWORD_DOC_RESPONDER sigmatch_table[DETECT_AL_IKE_SPI_RESPONDER].desc =
"sticky buffer to match on the IKE spi responder";
sigmatch_table[DETECT_AL_IKE_SPI_RESPONDER].Setup = DetectSpiResponderSetup;
sigmatch_table[DETECT_AL_IKE_SPI_RESPONDER].flags |=
SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER;
DetectAppLayerInspectEngineRegister2(BUFFER_NAME_RESPONDER, ALPROTO_IKE, SIG_FLAG_TOCLIENT, 1,
DetectEngineInspectBufferGeneric, GetResponderData);
DetectAppLayerMpmRegister2(BUFFER_NAME_RESPONDER, SIG_FLAG_TOCLIENT, 1,
PrefilterGenericMpmRegister, GetResponderData, ALPROTO_IKE, 1);
DetectBufferTypeSetDescriptionByName(BUFFER_NAME_RESPONDER, BUFFER_DESC_RESPONDER);
g_buffer_responder_id = DetectBufferTypeGetByName(BUFFER_NAME_RESPONDER);
SCLogDebug("registering " BUFFER_NAME_RESPONDER " rule option");
}
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