mirror of https://github.com/OISF/suricata
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
/* Copyright (C) 2022 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.
|
|
*/
|
|
|
|
#include "suricata-common.h"
|
|
#include "rust.h"
|
|
#include "detect-dhcp-leasetime.h"
|
|
#include "detect-engine.h"
|
|
#include "detect-engine-mpm.h"
|
|
#include "detect-engine-prefilter.h"
|
|
#include "detect-engine-uint.h"
|
|
#include "detect-parse.h"
|
|
|
|
static int g_buffer_id = 0;
|
|
|
|
/**
|
|
* \internal
|
|
* \brief Function to match leasetime of a TX
|
|
*
|
|
* \param t Pointer to thread vars.
|
|
* \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 s Pointer to the Signature.
|
|
* \param m Pointer to the sigmatch that we will cast into
|
|
* DetectU64Data.
|
|
*
|
|
* \retval 0 no match.
|
|
* \retval 1 match.
|
|
*/
|
|
static int DetectDHCPLeaseTimeMatch(DetectEngineThreadCtx *det_ctx, Flow *f, uint8_t flags,
|
|
void *state, void *txv, const Signature *s, const SigMatchCtx *ctx)
|
|
{
|
|
SCEnter();
|
|
|
|
uint64_t leasetime;
|
|
if (rs_dhcp_tx_get_leasetime(txv, &leasetime)) {
|
|
const DetectU64Data *dd = (const DetectU64Data *)ctx;
|
|
if (DetectU64Match(leasetime, dd)) {
|
|
SCReturnInt(1);
|
|
}
|
|
}
|
|
SCReturnInt(0);
|
|
}
|
|
|
|
/**
|
|
* \internal
|
|
* \brief Function to free memory associated with DetectU64Data.
|
|
*
|
|
* \param de_ptr Pointer to DetectU64Data.
|
|
*/
|
|
static void DetectDHCPLeaseTimeFree(DetectEngineCtx *de_ctx, void *ptr)
|
|
{
|
|
rs_detect_u64_free(ptr);
|
|
}
|
|
|
|
/**
|
|
* \brief Function to add the parsed dhcp leasetime 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.
|
|
* \param type Defines if this is notBefore or notAfter.
|
|
*
|
|
* \retval 0 on Success.
|
|
* \retval -1 on Failure.
|
|
*/
|
|
static int DetectDHCPLeaseTimeSetup(DetectEngineCtx *de_ctx, Signature *s, const char *rawstr)
|
|
{
|
|
if (DetectSignatureSetAppProto(s, ALPROTO_DHCP) != 0)
|
|
return -1;
|
|
|
|
DetectU64Data *dd = DetectU64Parse(rawstr);
|
|
if (dd == NULL) {
|
|
SCLogError("Parsing \'%s\' failed for %s", rawstr,
|
|
sigmatch_table[DETECT_AL_DHCP_LEASETIME].name);
|
|
return -1;
|
|
}
|
|
|
|
/* okay so far so good, lets get this into a SigMatch
|
|
* and put it in the Signature. */
|
|
|
|
if (SigMatchAppendSMToList(
|
|
de_ctx, s, DETECT_AL_DHCP_LEASETIME, (SigMatchCtx *)dd, g_buffer_id) == NULL) {
|
|
goto error;
|
|
}
|
|
return 0;
|
|
|
|
error:
|
|
DetectDHCPLeaseTimeFree(de_ctx, dd);
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* \brief Registration function for dhcp.procedure keyword.
|
|
*/
|
|
void DetectDHCPLeaseTimeRegister(void)
|
|
{
|
|
sigmatch_table[DETECT_AL_DHCP_LEASETIME].name = "dhcp.leasetime";
|
|
sigmatch_table[DETECT_AL_DHCP_LEASETIME].desc = "match DHCP leasetime";
|
|
sigmatch_table[DETECT_AL_DHCP_LEASETIME].url = "/rules/dhcp-keywords.html#dhcp-leasetime";
|
|
sigmatch_table[DETECT_AL_DHCP_LEASETIME].AppLayerTxMatch = DetectDHCPLeaseTimeMatch;
|
|
sigmatch_table[DETECT_AL_DHCP_LEASETIME].Setup = DetectDHCPLeaseTimeSetup;
|
|
sigmatch_table[DETECT_AL_DHCP_LEASETIME].Free = DetectDHCPLeaseTimeFree;
|
|
|
|
DetectAppLayerInspectEngineRegister("dhcp.leasetime", ALPROTO_DHCP, SIG_FLAG_TOSERVER, 0,
|
|
DetectEngineInspectGenericList, NULL);
|
|
|
|
DetectAppLayerInspectEngineRegister("dhcp.leasetime", ALPROTO_DHCP, SIG_FLAG_TOCLIENT, 0,
|
|
DetectEngineInspectGenericList, NULL);
|
|
|
|
g_buffer_id = DetectBufferTypeGetByName("dhcp.leasetime");
|
|
}
|