dhcp.leasetime:[op]<number>
-The version can be matched exactly, or compared using the _op_ setting::
+The time can be matched exactly, or compared using the _op_ setting::
dhcp.leasetime:3 # exactly 3
dhcp.leasetime:<3 # smaller than 3
dhcp.rebinding_time:[op]<number>
-The version can be matched exactly, or compared using the _op_ setting::
+The time can be matched exactly, or compared using the _op_ setting::
dhcp.rebinding_time:3 # exactly 3
dhcp.rebinding_time:<3 # smaller than 3
Signature example::
alert dhcp any any -> any any (msg:"small DHCP rebinding time (<3)"; dhcp.rebinding_time:<3; sid:1; rev:1;)
+
+dhcp.renewal_time
+-----------------
+
+DHCP renewal time (integer).
+
+Syntax::
+
+ dhcp.renewal_time:[op]<number>
+
+The time can be matched exactly, or compared using the _op_ setting::
+
+ dhcp.renewal_time:3 # exactly 3
+ dhcp.renewal_time:<3 # smaller than 3
+ dhcp.renewal_time:>=2 # greater or equal than 2
+
+Signature example::
+
+ alert dhcp any any -> any any (msg:"small DHCP renewal time (<3)"; dhcp.renewal_time:<3; sid:1; rev:1;)
\ No newline at end of file
--- /dev/null
+/* 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-renewal-time.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 renewal time 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 DetectDHCPRenewalTimeMatch(DetectEngineThreadCtx *det_ctx, Flow *f, uint8_t flags,
+ void *state, void *txv, const Signature *s, const SigMatchCtx *ctx)
+{
+ SCEnter();
+
+ uint64_t res;
+ if (rs_dhcp_tx_get_renewal_time(txv, &res)) {
+ const DetectU64Data *dd = (const DetectU64Data *)ctx;
+ if (DetectU64Match(res, dd)) {
+ SCReturnInt(1);
+ }
+ }
+ SCReturnInt(0);
+}
+
+/**
+ * \internal
+ * \brief Function to free memory associated with DetectU64Data.
+ *
+ * \param de_ptr Pointer to DetectU64Data.
+ */
+static void DetectDHCPRenewalTimeFree(DetectEngineCtx *de_ctx, void *ptr)
+{
+ rs_detect_u64_free(ptr);
+}
+
+/**
+ * \brief Function to add the parsed dhcp renewal time 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 DetectDHCPRenewalTimeSetup(DetectEngineCtx *de_ctx, Signature *s, const char *rawstr)
+{
+ if (DetectSignatureSetAppProto(s, ALPROTO_DHCP) != 0)
+ return -1;
+
+ DetectU64Data *dd = DetectU64Parse(rawstr);
+ if (dd == NULL) {
+ SCLogError(SC_ERR_INVALID_ARGUMENT, "Parsing \'%s\' failed for %s", rawstr,
+ sigmatch_table[DETECT_AL_DHCP_RENEWAL_TIME].name);
+ 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_DHCP_RENEWAL_TIME;
+ sm->ctx = (void *)dd;
+
+ SigMatchAppendSMToList(s, sm, g_buffer_id);
+ return 0;
+
+error:
+ DetectDHCPRenewalTimeFree(de_ctx, dd);
+ return -1;
+}
+
+/**
+ * \brief Registration function for dhcp.procedure keyword.
+ */
+void DetectDHCPRenewalTimeRegister(void)
+{
+ sigmatch_table[DETECT_AL_DHCP_RENEWAL_TIME].name = "dhcp.renewal_time";
+ sigmatch_table[DETECT_AL_DHCP_RENEWAL_TIME].desc = "match DHCP renewal time";
+ sigmatch_table[DETECT_AL_DHCP_RENEWAL_TIME].url = "/rules/dhcp-keywords.html#dhcp-renewal-time";
+ sigmatch_table[DETECT_AL_DHCP_RENEWAL_TIME].AppLayerTxMatch = DetectDHCPRenewalTimeMatch;
+ sigmatch_table[DETECT_AL_DHCP_RENEWAL_TIME].Setup = DetectDHCPRenewalTimeSetup;
+ sigmatch_table[DETECT_AL_DHCP_RENEWAL_TIME].Free = DetectDHCPRenewalTimeFree;
+
+ DetectAppLayerInspectEngineRegister2("dhcp.renewal-time", ALPROTO_DHCP, SIG_FLAG_TOSERVER, 0,
+ DetectEngineInspectGenericList, NULL);
+
+ DetectAppLayerInspectEngineRegister2("dhcp.renewal-time", ALPROTO_DHCP, SIG_FLAG_TOCLIENT, 0,
+ DetectEngineInspectGenericList, NULL);
+
+ g_buffer_id = DetectBufferTypeGetByName("dhcp.renewal-time");
+}
--- /dev/null
+/* 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.
+ */
+
+#ifndef __DETECT_DHCP_RENEWAL_TIME_H__
+#define __DETECT_DHCP_RENEWAL_TIME_H__
+
+void DetectDHCPRenewalTimeRegister(void);
+
+#endif /* __DETECT_DHCP_RENEWAL_TIME_H__ */
projects / thirdparty / suricata.git / commitdiff
