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82 lines
2.9 KiB
C
82 lines
2.9 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-snmp-usm.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-parse.h"
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static int g_buffer_id = 0;
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static int DetectSNMPUsmSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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if (DetectBufferSetActiveList(s, g_buffer_id) < 0)
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return -1;
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if (DetectSignatureSetAppProto(s, ALPROTO_SNMP) != 0)
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return -1;
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return 0;
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}
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static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *f, const uint8_t flow_flags, void *txv,
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const int list_id)
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{
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InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
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if (buffer->inspect == NULL) {
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uint32_t data_len = 0;
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const uint8_t *data = NULL;
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rs_snmp_tx_get_usm(txv, &data, &data_len);
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if (data == NULL || data_len == 0) {
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return NULL;
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}
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InspectionBufferSetup(det_ctx, list_id, buffer, data, data_len);
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InspectionBufferApplyTransforms(buffer, transforms);
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}
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return buffer;
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}
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void DetectSNMPUsmRegister(void)
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{
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sigmatch_table[DETECT_AL_SNMP_USM].name = "snmp.usm";
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sigmatch_table[DETECT_AL_SNMP_USM].desc = "SNMP content modifier to match on the SNMP usm";
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sigmatch_table[DETECT_AL_SNMP_USM].Setup = DetectSNMPUsmSetup;
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sigmatch_table[DETECT_AL_SNMP_USM].flags |= SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER;
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/* register inspect engines */
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DetectAppLayerInspectEngineRegister2("snmp.usm", ALPROTO_SNMP, SIG_FLAG_TOSERVER, 0,
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DetectEngineInspectBufferGeneric, GetData);
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DetectAppLayerMpmRegister2("snmp.usm", SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
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GetData, ALPROTO_SNMP, 0);
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DetectAppLayerInspectEngineRegister2("snmp.usm", ALPROTO_SNMP, SIG_FLAG_TOCLIENT, 0,
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DetectEngineInspectBufferGeneric, GetData);
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DetectAppLayerMpmRegister2("snmp.usm", SIG_FLAG_TOCLIENT, 2, PrefilterGenericMpmRegister,
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GetData, ALPROTO_SNMP, 0);
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DetectBufferTypeSetDescriptionByName("snmp.usm", "SNMP USM");
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g_buffer_id = DetectBufferTypeGetByName("snmp.usm");
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}
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