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142 lines
4.3 KiB
C
142 lines
4.3 KiB
C
/* Copyright (C) 2013-2023 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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* \ingroup dnslayer
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*
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* @{
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*/
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/**
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* \file
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*
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* \author Victor Julien <victor@inliniac.net>
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*/
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#include "suricata-common.h"
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#include "threads.h"
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#include "decode.h"
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#include "detect.h"
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#include "detect-parse.h"
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#include "detect-engine.h"
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#include "detect-engine-build.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-content-inspection.h"
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#include "detect-content.h"
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#include "detect-pcre.h"
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#include "flow.h"
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#include "flow-util.h"
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#include "flow-var.h"
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#include "util-debug.h"
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#include "util-spm.h"
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#include "util-print.h"
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#include "stream-tcp.h"
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#include "app-layer.h"
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#include "app-layer-parser.h"
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#include "detect-dns-query.h"
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#include "util-profiling.h"
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#include "rust.h"
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static int DetectDnsQuerySetup(DetectEngineCtx *, Signature *, const char *);
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static int g_dns_query_buffer_id = 0;
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static InspectionBuffer *DnsQueryGetData(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *f, const uint8_t flags, void *txv,
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int list_id, uint32_t local_id)
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{
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SCEnter();
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InspectionBuffer *buffer = InspectionBufferMultipleForListGet(det_ctx, list_id, local_id);
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if (buffer == NULL)
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return NULL;
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if (buffer->initialized)
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return buffer;
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const uint8_t *data;
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uint32_t data_len;
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if (SCDnsTxGetQueryName(txv, false, local_id, &data, &data_len) == 0) {
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InspectionBufferSetupMultiEmpty(buffer);
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return NULL;
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}
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InspectionBufferSetupMulti(det_ctx, buffer, transforms, data, data_len);
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buffer->flags = DETECT_CI_FLAGS_SINGLE;
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SCReturnPtr(buffer, "InspectionBuffer");
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}
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/**
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* \brief Registration function for keyword: dns_query
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*/
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void DetectDnsQueryRegister (void)
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{
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sigmatch_table[DETECT_DNS_QUERY].name = "dns.query";
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sigmatch_table[DETECT_DNS_QUERY].alias = "dns_query";
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sigmatch_table[DETECT_DNS_QUERY].desc = "sticky buffer to match DNS query-buffer";
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sigmatch_table[DETECT_DNS_QUERY].url = "/rules/dns-keywords.html#dns-query";
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sigmatch_table[DETECT_DNS_QUERY].Setup = DetectDnsQuerySetup;
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sigmatch_table[DETECT_DNS_QUERY].flags |= SIGMATCH_NOOPT;
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sigmatch_table[DETECT_DNS_QUERY].flags |= SIGMATCH_INFO_STICKY_BUFFER;
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DetectAppLayerMultiRegister(
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"dns_query", ALPROTO_DNS, SIG_FLAG_TOSERVER, 1, DnsQueryGetData, 2, 1);
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DetectBufferTypeSetDescriptionByName("dns_query",
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"dns request query");
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DetectBufferTypeSupportsMultiInstance("dns_query");
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g_dns_query_buffer_id = DetectBufferTypeGetByName("dns_query");
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/* register these generic engines from here for now */
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DetectAppLayerInspectEngineRegister(
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"dns_request", ALPROTO_DNS, SIG_FLAG_TOSERVER, 1, DetectEngineInspectGenericList, NULL);
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DetectAppLayerInspectEngineRegister("dns_response", ALPROTO_DNS, SIG_FLAG_TOCLIENT, 1,
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DetectEngineInspectGenericList, NULL);
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DetectBufferTypeSetDescriptionByName("dns_request",
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"dns requests");
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DetectBufferTypeSetDescriptionByName("dns_response", "dns responses");
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}
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/**
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* \brief setup the dns_query sticky buffer keyword used in the rule
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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 Signature to which the current keyword belongs
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* \param str Should hold an empty string always
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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 DetectDnsQuerySetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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if (DetectBufferSetActiveList(de_ctx, s, g_dns_query_buffer_id) < 0)
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return -1;
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if (DetectSignatureSetAppProto(s, ALPROTO_DNS) < 0)
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return -1;
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return 0;
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}
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