mirror of https://github.com/OISF/suricata
dns: add keywords for additionals and authorities rrnames
Add keywords dns.additionals.rrname and dns.authorities.rrname. Along the way, consolidate dns.query.name and dns.answer.name into a single file and register them altogether since there is a lot of common code.pull/12717/head
Jason Ish
10 months ago
committed by
Victor Julien
parent
c57e1425f5
commit
814e9ffb7a
@ -1,92 +0,0 @@
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/* Copyright (C) 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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* \file
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*
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* Detect keyword for DNS answer name: dns.answer.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-prefilter.h"
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#include "detect-engine-content-inspection.h"
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#include "detect-dns-answer-name.h"
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#include "util-profiling.h"
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#include "rust.h"
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static int detect_buffer_id = 0;
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static int DetectSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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if (DetectBufferSetActiveList(de_ctx, s, detect_buffer_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 InspectionBuffer *GetBuffer(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *f, uint8_t flags, void *txv, int list_id,
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uint32_t index)
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{
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InspectionBuffer *buffer = InspectionBufferMultipleForListGet(det_ctx, list_id, index);
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if (buffer == NULL) {
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return NULL;
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}
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if (buffer->initialized) {
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return buffer;
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}
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bool to_client = (flags & STREAM_TOSERVER) == 0;
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const uint8_t *data = NULL;
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uint32_t data_len = 0;
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if (!SCDnsTxGetAnswerName(txv, to_client, index, &data, &data_len)) {
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InspectionBufferSetupMultiEmpty(buffer);
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return NULL;
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}
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InspectionBufferSetupMulti(buffer, transforms, data, data_len);
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buffer->flags = DETECT_CI_FLAGS_SINGLE;
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return buffer;
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}
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void DetectDnsAnswerNameRegister(void)
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{
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static const char *keyword = "dns.answer.name";
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sigmatch_table[DETECT_DNS_ANSWER_NAME].name = keyword;
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sigmatch_table[DETECT_DNS_ANSWER_NAME].desc = "DNS answer name sticky buffer";
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sigmatch_table[DETECT_DNS_ANSWER_NAME].url = "/rules/dns-keywords.html#dns-answer-name";
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sigmatch_table[DETECT_DNS_ANSWER_NAME].Setup = DetectSetup;
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sigmatch_table[DETECT_DNS_ANSWER_NAME].flags |= SIGMATCH_NOOPT;
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sigmatch_table[DETECT_DNS_ANSWER_NAME].flags |= SIGMATCH_INFO_STICKY_BUFFER;
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/* Register in the TO_SERVER direction, even though this is not
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normal, it could be provided as part of a request. */
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DetectAppLayerMultiRegister(keyword, ALPROTO_DNS, SIG_FLAG_TOSERVER, 0, GetBuffer, 2, 1);
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/* Register in the TO_CLIENT direction. */
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DetectAppLayerMultiRegister(keyword, ALPROTO_DNS, SIG_FLAG_TOCLIENT, 0, GetBuffer, 2, 1);
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DetectBufferTypeSetDescriptionByName(keyword, "dns answer name");
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DetectBufferTypeSupportsMultiInstance(keyword);
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detect_buffer_id = DetectBufferTypeGetByName(keyword);
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}
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@ -1,23 +0,0 @@
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/* Copyright (C) 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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#ifndef SURICATA_DETECT_DNS_ANSWER_NAME_H
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#define SURICATA_DETECT_DNS_ANSWER_NAME_H
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void DetectDnsAnswerNameRegister(void);
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#endif /* SURICATA_DETECT_DNS_ANSWER_NAME_H */
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@ -0,0 +1,188 @@
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/* 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 InspectionBuffer *GetBuffer(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *f, uint8_t flags, void *txv, int list_id,
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uint32_t index, enum DnsSection what)
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{
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InspectionBuffer *buffer = InspectionBufferMultipleForListGet(det_ctx, list_id, index);
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if (buffer == NULL) {
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return NULL;
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}
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if (buffer->initialized) {
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return buffer;
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}
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bool to_client = (flags & STREAM_TOSERVER) == 0;
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const uint8_t *data = NULL;
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uint32_t data_len = 0;
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bool ok = false;
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switch (what) {
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case DNS_QUERY:
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ok = SCDnsTxGetQueryName(txv, to_client, index, &data, &data_len);
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break;
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case DNS_ANSWER:
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ok = SCDnsTxGetAnswerName(txv, to_client, index, &data, &data_len);
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break;
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case DNS_AUTHORITY:
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ok = SCDnsTxGetAuthorityName(txv, index, &data, &data_len);
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break;
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case DNS_ADDITIONAL:
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ok = SCDnsTxGetAdditionalName(txv, index, &data, &data_len);
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break;
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default:
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DEBUG_VALIDATE_BUG_ON("unhandled dns rrname type");
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InspectionBufferSetupMultiEmpty(buffer);
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return NULL;
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}
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if (ok) {
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InspectionBufferSetupMulti(buffer, transforms, data, data_len);
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buffer->flags = DETECT_CI_FLAGS_SINGLE;
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return buffer;
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}
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InspectionBufferSetupMultiEmpty(buffer);
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return NULL;
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}
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static InspectionBuffer *GetQueryBuffer(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *f, uint8_t flags, void *txv, int list_id,
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uint32_t index)
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{
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return GetBuffer(det_ctx, transforms, f, flags, txv, list_id, index, DNS_QUERY);
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}
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static InspectionBuffer *GetAnswerBuffer(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *f, uint8_t flags, void *txv, int list_id,
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uint32_t index)
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{
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return GetBuffer(det_ctx, transforms, f, flags, txv, list_id, index, DNS_ANSWER);
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}
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static InspectionBuffer *GetAuthorityBuffer(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *f, uint8_t flags, void *txv, int list_id,
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uint32_t index)
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{
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return GetBuffer(det_ctx, transforms, f, flags, txv, list_id, index, DNS_AUTHORITY);
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}
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static InspectionBuffer *GetAdditionalBuffer(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *f, uint8_t flags, void *txv, int list_id,
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uint32_t index)
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{
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return GetBuffer(det_ctx, transforms, f, flags, txv, list_id, index, DNS_ADDITIONAL);
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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, GetQueryBuffer);
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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, GetAnswerBuffer);
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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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GetAdditionalBuffer);
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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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GetAuthorityBuffer);
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}
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@ -1,91 +0,0 @@
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/* Copyright (C) 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
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
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||||
* 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
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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 query names: dns.query.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-prefilter.h"
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#include "detect-engine-content-inspection.h"
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#include "detect-dns-query-name.h"
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#include "util-profiling.h"
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#include "rust.h"
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static int detect_buffer_id = 0;
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static int DetectSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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if (DetectBufferSetActiveList(de_ctx, s, detect_buffer_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 InspectionBuffer *GetBuffer(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 index)
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{
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InspectionBuffer *buffer = InspectionBufferMultipleForListGet(det_ctx, list_id, index);
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if (buffer == NULL) {
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return NULL;
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}
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if (buffer->initialized) {
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return buffer;
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}
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bool to_client = (flags & STREAM_TOSERVER) == 0;
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const uint8_t *data = NULL;
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uint32_t data_len = 0;
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if (!SCDnsTxGetQueryName(txv, to_client, index, &data, &data_len)) {
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InspectionBufferSetupMultiEmpty(buffer);
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return NULL;
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}
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InspectionBufferSetupMulti(buffer, transforms, data, data_len);
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buffer->flags = DETECT_CI_FLAGS_SINGLE;
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return buffer;
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}
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void DetectDnsQueryNameRegister(void)
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{
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static const char *keyword = "dns.query.name";
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sigmatch_table[DETECT_DNS_QUERY_NAME].name = keyword;
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sigmatch_table[DETECT_DNS_QUERY_NAME].desc = "DNS query name sticky buffer";
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sigmatch_table[DETECT_DNS_QUERY_NAME].url = "/rules/dns-keywords.html#dns-query-name";
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sigmatch_table[DETECT_DNS_QUERY_NAME].Setup = DetectSetup;
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sigmatch_table[DETECT_DNS_QUERY_NAME].flags |= SIGMATCH_NOOPT;
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sigmatch_table[DETECT_DNS_QUERY_NAME].flags |= SIGMATCH_INFO_STICKY_BUFFER;
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/* Register in both directions as the query is usually echoed back
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in the response. */
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DetectAppLayerMultiRegister(keyword, ALPROTO_DNS, SIG_FLAG_TOSERVER, 0, GetBuffer, 2, 1);
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DetectAppLayerMultiRegister(keyword, ALPROTO_DNS, SIG_FLAG_TOCLIENT, 0, GetBuffer, 2, 1);
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DetectBufferTypeSetDescriptionByName(keyword, "dns query name");
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DetectBufferTypeSupportsMultiInstance(keyword);
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detect_buffer_id = DetectBufferTypeGetByName(keyword);
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}
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