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132 lines
4.3 KiB
C
132 lines
4.3 KiB
C
/* Copyright (C) 2022 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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#include "suricata-common.h"
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#include "rust.h"
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#include "detect-dhcp-rebinding-time.h"
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#include "detect-engine.h"
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#include "detect-engine-mpm.h"
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#include "detect-engine-prefilter.h"
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#include "detect-engine-uint.h"
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#include "detect-parse.h"
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static int g_buffer_id = 0;
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/**
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* \internal
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* \brief Function to match rebinding time of a TX
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*
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* \param t Pointer to thread vars.
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* \param det_ctx Pointer to the pattern matcher thread.
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* \param f Pointer to the current flow.
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* \param flags Flags.
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* \param state App layer state.
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* \param s Pointer to the Signature.
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* \param m Pointer to the sigmatch that we will cast into
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* DetectU64Data.
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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 DetectDHCPRebindingTimeMatch(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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SCEnter();
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uint64_t res;
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if (rs_dhcp_tx_get_rebinding_time(txv, &res)) {
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const DetectU64Data *dd = (const DetectU64Data *)ctx;
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if (DetectU64Match(res, dd)) {
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SCReturnInt(1);
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}
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}
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SCReturnInt(0);
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}
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/**
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* \internal
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* \brief Function to free memory associated with DetectU64Data.
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*
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* \param de_ptr Pointer to DetectU64Data.
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*/
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static void DetectDHCPRebindingTimeFree(DetectEngineCtx *de_ctx, void *ptr)
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{
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rs_detect_u64_free(ptr);
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}
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/**
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* \brief Function to add the parsed dhcp rebinding time field 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 rawstr Pointer to the user provided flags options.
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* \param type Defines if this is notBefore or notAfter.
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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 DetectDHCPRebindingTimeSetup(DetectEngineCtx *de_ctx, Signature *s, const char *rawstr)
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{
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if (DetectSignatureSetAppProto(s, ALPROTO_DHCP) != 0)
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return -1;
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DetectU64Data *dd = DetectU64Parse(rawstr);
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if (dd == NULL) {
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SCLogError(SC_ERR_INVALID_ARGUMENT, "Parsing \'%s\' failed for %s", rawstr,
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sigmatch_table[DETECT_AL_DHCP_REBINDING_TIME].name);
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return -1;
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}
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/* okay so far so good, lets get this into a SigMatch
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* and put it in the Signature. */
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SigMatch *sm = SigMatchAlloc();
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if (sm == NULL)
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goto error;
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sm->type = DETECT_AL_DHCP_REBINDING_TIME;
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sm->ctx = (void *)dd;
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SigMatchAppendSMToList(s, sm, g_buffer_id);
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return 0;
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error:
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DetectDHCPRebindingTimeFree(de_ctx, dd);
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return -1;
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}
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/**
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* \brief Registration function for dhcp.procedure keyword.
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*/
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void DetectDHCPRebindingTimeRegister(void)
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{
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sigmatch_table[DETECT_AL_DHCP_REBINDING_TIME].name = "dhcp.rebinding_time";
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sigmatch_table[DETECT_AL_DHCP_REBINDING_TIME].desc = "match DHCP rebinding time";
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sigmatch_table[DETECT_AL_DHCP_REBINDING_TIME].url =
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"/rules/dhcp-keywords.html#dhcp-rebinding-time";
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sigmatch_table[DETECT_AL_DHCP_REBINDING_TIME].AppLayerTxMatch = DetectDHCPRebindingTimeMatch;
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sigmatch_table[DETECT_AL_DHCP_REBINDING_TIME].Setup = DetectDHCPRebindingTimeSetup;
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sigmatch_table[DETECT_AL_DHCP_REBINDING_TIME].Free = DetectDHCPRebindingTimeFree;
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DetectAppLayerInspectEngineRegister2("dhcp.rebinding-time", ALPROTO_DHCP, SIG_FLAG_TOSERVER, 0,
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DetectEngineInspectGenericList, NULL);
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DetectAppLayerInspectEngineRegister2("dhcp.rebinding-time", ALPROTO_DHCP, SIG_FLAG_TOCLIENT, 0,
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DetectEngineInspectGenericList, NULL);
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g_buffer_id = DetectBufferTypeGetByName("dhcp.rebinding-time");
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}
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