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115 lines
3.9 KiB
C
115 lines
3.9 KiB
C
/* Copyright (C) 2025 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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* \file
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*
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* Detect keyword for DNS rrnames:
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* - dns.queries.rrname
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* - dns.answers.rrname
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* - dns.authorities.name
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* - dns.additionals.name
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*/
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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-content-inspection.h"
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#include "detect-engine-helper.h"
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#include "detect-dns-name.h"
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#include "rust.h"
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enum DnsSection {
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DNS_QUERY = 0,
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DNS_ANSWER,
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DNS_AUTHORITY,
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DNS_ADDITIONAL,
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};
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static int query_buffer_id = 0;
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static int answer_buffer_id = 0;
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static int authority_buffer_id = 0;
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static int additional_buffer_id = 0;
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static int DetectSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str, int id)
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{
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if (DetectBufferSetActiveList(de_ctx, s, id) < 0) {
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return -1;
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}
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if (DetectSignatureSetAppProto(s, ALPROTO_DNS) < 0) {
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return -1;
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}
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return 0;
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}
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static int SetupQueryBuffer(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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return DetectSetup(de_ctx, s, str, query_buffer_id);
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}
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static int SetupAnswerBuffer(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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return DetectSetup(de_ctx, s, str, answer_buffer_id);
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}
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static int SetupAdditionalsBuffer(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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return DetectSetup(de_ctx, s, str, additional_buffer_id);
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}
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static int SetupAuthoritiesBuffer(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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return DetectSetup(de_ctx, s, str, authority_buffer_id);
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}
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static int Register(const char *keyword, const char *desc, const char *doc,
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int (*Setup)(DetectEngineCtx *, Signature *, const char *),
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InspectionMultiBufferGetDataPtr GetBufferFn)
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{
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int keyword_id = SCDetectHelperNewKeywordId();
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sigmatch_table[keyword_id].name = keyword;
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sigmatch_table[keyword_id].desc = desc;
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sigmatch_table[keyword_id].url = doc;
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sigmatch_table[keyword_id].Setup = Setup;
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sigmatch_table[keyword_id].flags |= SIGMATCH_NOOPT;
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sigmatch_table[keyword_id].flags |= SIGMATCH_INFO_STICKY_BUFFER;
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DetectAppLayerMultiRegister(keyword, ALPROTO_DNS, SIG_FLAG_TOSERVER, 0, GetBufferFn, 2, 1);
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DetectAppLayerMultiRegister(keyword, ALPROTO_DNS, SIG_FLAG_TOCLIENT, 0, GetBufferFn, 2, 1);
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DetectBufferTypeSetDescriptionByName(keyword, keyword);
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DetectBufferTypeSupportsMultiInstance(keyword);
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return DetectBufferTypeGetByName(keyword);
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}
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void DetectDnsNameRegister(void)
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{
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query_buffer_id = Register("dns.queries.rrname", "DNS query rrname sticky buffer",
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"/rules/dns-keywords.html#dns.queries.rrname", SetupQueryBuffer, SCDnsTxGetQueryName);
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answer_buffer_id = Register("dns.answers.rrname", "DNS answer rrname sticky buffer",
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"/rules/dns-keywords.html#dns.answers.rrname", SetupAnswerBuffer, SCDnsTxGetAnswerName);
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additional_buffer_id =
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Register("dns.additionals.rrname", "DNS additionals rrname sticky buffer",
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"/rules/dns-keywords.html#dns-additionals-rrname", SetupAdditionalsBuffer,
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SCDnsTxGetAdditionalName);
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authority_buffer_id = Register("dns.authorities.rrname", "DNS authorities rrname sticky buffer",
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"/rules/dns-keywords.html#dns-authorities-rrname", SetupAuthoritiesBuffer,
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SCDnsTxGetAuthorityName);
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}
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