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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 "conf.h"
#include "detect.h"
#include "detect-parse.h"
#include "detect-engine.h"
#include "detect-engine-content-inspection.h"
#include "detect-ike-nonce-payload-length.h"
#include "app-layer-parser.h"
#include "util-byte.h"
#include "detect-engine-uint.h"
#include "rust-bindings.h"
/**
* [ike.nonce_payload_length]:[=|<|>|<=|>=]<length>;
*/
static int DetectIkeNoncePayloadLengthSetup(DetectEngineCtx *, Signature *s, const char *str);
static void DetectIkeNoncePayloadLengthFree(DetectEngineCtx *, void *);
static int g_ike_nonce_payload_length_buffer_id = 0;
static int DetectIkeNoncePayloadLengthMatch(DetectEngineThreadCtx *, Flow *, uint8_t, void *,
void *, const Signature *, const SigMatchCtx *);
/**
* \brief Registration function for ike.nonce_payload_length keyword.
*/
void DetectIkeNoncePayloadLengthRegister(void)
{
sigmatch_table[DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH].name = "ike.nonce_payload_length";
sigmatch_table[DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH].desc = "match IKE nonce payload length";
sigmatch_table[DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH].url =
"/rules/ike-keywords.html#ike-nonce-payload-length";
sigmatch_table[DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH].AppLayerTxMatch =
DetectIkeNoncePayloadLengthMatch;
sigmatch_table[DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH].Setup = DetectIkeNoncePayloadLengthSetup;
sigmatch_table[DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH].Free = DetectIkeNoncePayloadLengthFree;
DetectAppLayerInspectEngineRegister2("ike.nonce_payload_length", ALPROTO_IKE, SIG_FLAG_TOSERVER,
1, DetectEngineInspectGenericList, NULL);
DetectAppLayerInspectEngineRegister2("ike.nonce_payload_length", ALPROTO_IKE, SIG_FLAG_TOCLIENT,
1, DetectEngineInspectGenericList, NULL);
g_ike_nonce_payload_length_buffer_id = DetectBufferTypeGetByName("ike.nonce_payload_length");
}
/**
* \internal
* \brief Function to match nonce length of a IKE state
*
* \param det_ctx Pointer to the pattern matcher thread.
* \param f Pointer to the current flow.
* \param flags Flags.
* \param state App layer state.
* \param txv Pointer to the Ike Transaction.
* \param s Pointer to the Signature.
* \param ctx Pointer to the sigmatch that we will cast into DetectU32Data.
*
* \retval 0 no match.
* \retval 1 match.
*/
static int DetectIkeNoncePayloadLengthMatch(DetectEngineThreadCtx *det_ctx, Flow *f, uint8_t flags,
void *state, void *txv, const Signature *s, const SigMatchCtx *ctx)
{
SCEnter();
uint32_t length;
if (!rs_ike_state_get_nonce_payload_length(txv, &length))
SCReturnInt(0);
const DetectU32Data *du32 = (const DetectU32Data *)ctx;
return DetectU32Match(length, du32);
}
/**
* \brief Function to add the parsed IKE nonce length field into the current signature.
*
* \param de_ctx Pointer to the Detection Engine Context.
* \param s Pointer to the Current Signature.
* \param rawstr Pointer to the user provided flags options.
*
* \retval 0 on Success.
* \retval -1 on Failure.
*/
static int DetectIkeNoncePayloadLengthSetup(
DetectEngineCtx *de_ctx, Signature *s, const char *rawstr)
{
if (DetectSignatureSetAppProto(s, ALPROTO_IKE) != 0)
return -1;
DetectU32Data *nonce_payload_length = DetectU32Parse(rawstr);
if (nonce_payload_length == NULL)
return -1;
/* okay so far so good, lets get this into a SigMatch
* and put it in the Signature. */
SigMatch *sm = SigMatchAlloc();
if (sm == NULL)
goto error;
sm->type = DETECT_AL_IKE_NONCE_PAYLOAD_LENGTH;
sm->ctx = (SigMatchCtx *)nonce_payload_length;
SigMatchAppendSMToList(s, sm, g_ike_nonce_payload_length_buffer_id);
return 0;
error:
DetectIkeNoncePayloadLengthFree(de_ctx, nonce_payload_length);
return -1;
}
/**
* \internal
* \brief Function to free memory associated with DetectU32Data.
*
* \param de_ptr Pointer to DetectU32Data.
*/
static void DetectIkeNoncePayloadLengthFree(DetectEngineCtx *de_ctx, void *ptr)
{
rs_detect_u32_free(ptr);
}
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