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110 lines
3.7 KiB
C
110 lines
3.7 KiB
C
/* Copyright (C) 2023 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Philippe Antoine
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*
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* Set up ENIP protocol version keyword
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*/
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#include "suricata-common.h"
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#include "detect-parse.h"
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#include "detect-engine.h"
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#include "detect-engine-uint.h"
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#include "rust.h"
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#include "detect-enip-protocol-version.h"
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static int g_enip_protocol_version_id = 0;
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static void DetectEnipProtocolVersionFree(DetectEngineCtx *de_ctx, void *ptr)
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{
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rs_detect_u16_free(ptr);
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}
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/**
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* \brief this function is used to parse enip_protocol_version data into the current signature
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*
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* \param de_ctx pointer to the Detection Engine Context
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* \param s pointer to the Current Signature
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* \param rulestr pointer to the user provided enip protocol_version options
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*
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* \retval 0 on Success
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* \retval -1 on Failure
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*/
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static int DetectEnipProtocolVersionSetup(
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DetectEngineCtx *de_ctx, Signature *s, const char *rulestr)
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{
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if (DetectSignatureSetAppProto(s, ALPROTO_ENIP) != 0)
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return -1;
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DetectU16Data *du16 = DetectU16Parse(rulestr);
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if (du16 == NULL) {
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return -1;
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}
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if (SigMatchAppendSMToList(de_ctx, s, DETECT_ENIP_PROTOCOLVERSION, (SigMatchCtx *)du16,
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g_enip_protocol_version_id) == NULL) {
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DetectEnipProtocolVersionFree(de_ctx, du16);
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SCReturnInt(-1);
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}
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SCReturnInt(0);
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}
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/**
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* \brief This function is used to match enip protocol_version type rule option on a transaction
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* with those passed via enip_protocol_version:
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*
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* \retval 0 no match
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* \retval 1 match
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*/
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static int DetectEnipProtocolVersionMatch(DetectEngineThreadCtx *det_ctx, Flow *f, uint8_t flags,
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void *state, void *txv, const Signature *s, const SigMatchCtx *ctx)
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{
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uint16_t value;
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if (!ScEnipTxGetProtocolVersion(txv, flags, &value))
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SCReturnInt(0);
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const DetectU16Data *du16 = (const DetectU16Data *)ctx;
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return DetectU16Match(value, du16);
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}
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/**
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* \brief Registration function for enip_protocol_version: keyword
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*/
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void DetectEnipProtocolVersionRegister(void)
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{
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sigmatch_table[DETECT_ENIP_PROTOCOLVERSION].name = "enip.protocol_version"; // rule keyword
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sigmatch_table[DETECT_ENIP_PROTOCOLVERSION].desc =
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"rules for detecting EtherNet/IP protocol_version";
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sigmatch_table[DETECT_ENIP_PROTOCOLVERSION].url =
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"/rules/enip-keyword.html#enip-protocol-version";
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sigmatch_table[DETECT_ENIP_PROTOCOLVERSION].Match = NULL;
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sigmatch_table[DETECT_ENIP_PROTOCOLVERSION].AppLayerTxMatch = DetectEnipProtocolVersionMatch;
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sigmatch_table[DETECT_ENIP_PROTOCOLVERSION].Setup = DetectEnipProtocolVersionSetup;
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sigmatch_table[DETECT_ENIP_PROTOCOLVERSION].Free = DetectEnipProtocolVersionFree;
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DetectAppLayerInspectEngineRegister("enip.protocol_version", ALPROTO_ENIP, SIG_FLAG_TOSERVER, 0,
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DetectEngineInspectGenericList, NULL);
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DetectAppLayerInspectEngineRegister("enip.protocol_version", ALPROTO_ENIP, SIG_FLAG_TOCLIENT, 0,
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DetectEngineInspectGenericList, NULL);
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g_enip_protocol_version_id = DetectBufferTypeGetByName("enip.protocol_version");
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}
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