Contents
Snort3
1.必要なパッケージをインストール
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# apt install build-essential libpcap-dev libpcre3-dev libnet1-dev zlib1g-dev luajit hwloc libdumbnet-dev bison flex liblzma-dev openssl libssl-dev pkg-config libhwloc-dev cmake cpputest libsqlite3-dev uuid-dev libcmocka-dev libnetfilter-queue-dev libmnl-dev autotools-dev libluajit-5.1-dev libunwind-dev libfl-dev -y |
2. DAQライブラリをインストール
DAQライブラリをダウンロードしてインストール
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# git clone https://github.com/snort3/libdaq.git # cd libdaq/ ~/libdaq# ./bootstrap ~/libdaq# ./configure ~/libdaq# make ~/libdaq# make install |
3. Gperftoolsをインストール
複数のインスタンスにおけるメモリ処理を改善することで、特定のアプリケーションやサービスのパフォーマンスを向上させるために使用されるプロファイラツール
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# cd # wget https://github.com/gperftools/gperftools/releases/download/gperftools-2.13/gperftools-2.13.tar.gz # tar xzf gperftools-2.13.tar.gz # cd gperftools-2.13 ~/gperftools-2.13# ./configure ~/gperftools-2.13# make ~/gperftools-2.13# make install |
4. SNORT3のインストール
①SNORT3のダウンロードと展開
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# cd # wget https://github.com/snort3/snort3/archive/refs/heads/master.zip # apt install unzip # unzip master.zip # cd snort3-master |
➁コンフィグレーション
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# ./configure_cmake.sh --prefix=/usr/local --enable-tcmalloc ------------------------------------------------------- snort version 3.11.1.0 Install options: prefix: /usr/local includes: /usr/local/include/snort plugins: /usr/local/lib/snort Compiler options: CC: /usr/bin/cc CXX: /usr/bin/c++ CFLAGS: -fvisibility=hidden -DNDEBUG -g -ggdb -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free -O2 -g -DNDEBUG CXXFLAGS: -fvisibility=hidden -DNDEBUG -g -ggdb -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free -O2 -g -DNDEBUG EXE_LDFLAGS: MODULE_LDFLAGS: Feature options: DAQ Modules: Static (afpacket;bpf;dump;fst;gwlb;nfq;pcap;savefile;trace) libatomic: System-provided Hyperscan: OFF ICONV: ON Libunwind: ON LZMA: ON RPC DB: Built-in SafeC: OFF TCMalloc: ON JEMalloc: OFF UUID: ON NUMA: ON LibML: OFF ------------------------------------------------------- -- Configuring done (3.8s) -- Generating done (0.2s) -- Build files have been written to: /root/snort3-master/buil |
上記でERROR! Libpcre2 library not found.と表示される場合はlibpcre2-devパッケージをインストールする
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# apt -y install libpcre2-dev |
➂インストール
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# cd build # make # make install |
④共有ライブラリを更新
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# ldconfig |
⑤バージョンを確認
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# snort -V ,,_ -*> Snort++ <*- o" )~ Version 3.11.1.0 '''' By Martin Roesch & The Snort Team http://snort.org/contact#team Copyright (C) 2014-2026 Cisco and/or its affiliates. All rights reserved. Copyright (C) 1998-2013 Sourcefire, Inc., et al. Using DAQ version 3.0.25 Using libpcap version 1.10.4 (with TPACKET_V3) Using LuaJIT version 2.1.1703358377 Using LZMA version 5.4.5 Using OpenSSL 3.0.13 30 Jan 2024 Using PCRE2 version 10.42 2022-12-11 Using ZLIB version 1.3 |
⑥デフォルト設定をテスト
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# snort -c /usr/local/etc/snort/snort.lua |
正常であれば下記のように表示される
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-------------------------------------------------- o")~ Snort++ 3.11.1.0 -------------------------------------------------- Loading /usr/local/etc/snort/snort.lua: Loading snort_defaults.lua: Finished snort_defaults.lua: decode host_cache ----omission----- -------------------------------------------------- rule counts total rules loaded: 219 text rules: 219 option chains: 219 chain headers: 1 -------------------------------------------------- service rule counts to-srv to-cli file_id: 219 219 total: 219 219 -------------------------------------------------- fast pattern groups to_server: 1 to_client: 1 -------------------------------------------------- search engine (ac_bnfa) instances: 2 patterns: 438 pattern chars: 2602 num states: 1832 num match states: 392 memory scale: KB total memory: 71.2812 pattern memory: 19.6484 match list memory: 28.4375 transition memory: 22.9453 appid: MaxRss diff: 3328 appid: patterns loaded: 300 -------------------------------------------------- pcap DAQ configured to passive. Snort successfully validated the configuration (with 0 warnings). o")~ Snort exiting |
5. ネットワークインタフェースを特定し、設定
①ネットワーク・イ ンターフェースを確認
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# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host noprefixroute valid_lft forever preferred_lft forever 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 link/ether 00:0c:29:f0:00:64 brd ff:ff:ff:ff:ff:ff altname enp2s1 inet 192.168.11.83/24 brd 192.168.11.255 scope global ens33 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fef0:64/64 scope link valid_lft forever preferred_lft forever |
ネットワーク・イ ンターフェース名はens33
➁ネットワークインターフェースをプロミスキャスモードに設定
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# ip link set dev ens33 promisc on |
設定を確認
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# ip addr | grep ens33 | grep mtu 2: ens33: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 |
➂ラージ・レシーブ・オフロード（LRO）とジェネリック・レシーブ・オフロード（GRO）をオフ状態に設定
現在の状態を確認
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# ethtool -k ens33 | grep receive-offload generic-receive-offload: on large-receive-offload: off [fixed |
LROとGROのオフロードステータスをオフ状態に設定
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# ethtool -K ens33 gro off lro off |
6. ネットワークインターフェース用のsystemdサービスを作成
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# touch /etc/systemd/system/snort3-nic.service # vi /etc/systemd/system/snort3-nic.service |
snort3-nic.serviceの内容
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[Unit] Description=Set Snort 3 NIC in promiscuous mode and Disable GRO, LRO on boot After=network.target [Service] Type=oneshot ExecStart=/usr/sbin/ip link set dev ens33 promisc on ExecStart=/usr/sbin/ethtool -K ens33 gro off lro off TimeoutStartSec=0 RemainAfterExit=yes [Install] WantedBy=default.target |
systemd デーモンをリロードし、変更を適用
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# systemctl daemon-reload |
snort3-nic.serviceを起動し、有効にします
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# systemctl start snort3-nic.service # systemctl enable snort3-nic.service Created symlink /etc/systemd/system/default.target.wants/snort3-nic.service → /etc/systemd/system/snort3-nic.service |
snort3-nic.serviceのステータスを確認
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# systemctl status snort3-nic.service ● snort3-nic.service - Set Snort 3 NIC in promiscuous mode and Disable GRO, LRO on boot Loaded: loaded (/etc/systemd/system/snort3-nic.service; enabled; preset: enabled) Active: active (exited) since Wed 2026-03-04 15:30:32 JST; 16s ago Main PID: 62096 (code=exited, status=0/SUCCESS) CPU: 8ms Mar 04 15:30:32 Lepard systemd[1]: Starting snort3-nic.service - Set Snort 3 NIC in promiscuous mode and Disable GRO, LRO on boot... Mar 04 15:30:32 Lepard systemd[1]: Finished snort3-nic.service - Set Snort 3 NIC in promiscuous mode and Disable GRO, LRO on boot. |
7. Snort Rulesの追加
7.1 コミュニティ・ルールセットを追加
①Snortルール用のフォルダを作成し、SnortのWebサイトからコミュニティルールセットをダウンロード
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# mkdir /usr/local/etc/snort/rules # wget -qO- https://www.snort.org/downloads/community/snort3-community-rules.tar.gz | tar xz -C /usr/local/etc/snort/rules/ |
➁ Snortメイン設定ファイルを編集
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# vi /usr/local/etc/snort/snort.lua # 24行目 : 自ネットワークに変更 HOME_NET = '192.168.11.0/24' # 28行目 : 変更 EXTERNAL_NET = '!$HOME_NET' 197行目当たりに追加 ips = { -- use this to enable decoder and inspector alerts -- enable_builtin_rules = true, -- use include for rules files; be sure to set your path -- note that rules files can include other rules files -- (see also related path vars at the top of snort_defaults.lua) variables = default_variables, rules = [[ include /usr/local/etc/snort/rules/snort3-community-rules/snort3-community.rules ]] } |
➂ メイン構成の変更をテスト
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# snort -c /usr/local/etc/snort/snort.lua 正常であれば次のように表示される ... -------------------------------------------------- search engine (ac_bnfa) instances: 334 patterns: 10779 pattern chars: 175202 num states: 123205 num match states: 10502 memory scale: MB total memory: 3.68025 pattern memory: 0.577953 match list memory: 1.33503 transition memory: 1.7265 fast pattern only: 7097 appid: MaxRss diff: 3328 appid: patterns loaded: 300 -------------------------------------------------- pcap DAQ configured to passive. Snort successfully validated the configuration (with 0 warnings). o")~ Snort exiting |
7.2 カスタムルールを追加
①Snort rulesディレクトリにファイルを作成
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# touch /usr/local/etc/snort/rules/local.rules # vi /usr/local/etc/snort/rules/local.rules alert icmp any any -> $HOME_NET any (msg:"Incoming ICMP"; sid:1000001; rev:1;) |
➁Snortメイン構成を編集
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# vi /usr/local/etc/snort/snort.lua 198行目当たりに追加 ips = { -- use this to enable decoder and inspector alerts -- enable_builtin_rules = true, -- use include for rules files; be sure to set your path -- note that rules files can include other rules files -- (see also related path vars at the top of snort_defaults.lua) variables = default_variables, rules = [[ include /usr/local/etc/snort/rules/local.rules include /usr/local/etc/snort/rules/snort3-community-rules/snort3-community.rules ]] } |
➂ メイン構成の変更をテスト
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# snort -c /usr/local/etc/snort/snort.lua 正常であれば次のように表示される ... -------------------------------------------------- search engine (ac_bnfa) instances: 338 patterns: 10778 pattern chars: 175278 num states: 123344 num match states: 10498 memory scale: MB total memory: 3.68713 pattern memory: 0.577984 match list memory: 1.33597 transition memory: 1.73192 fast pattern only: 7099 appid: MaxRss diff: 3328 appid: patterns loaded: 300 -------------------------------------------------- pcap DAQ configured to passive. Snort successfully validated the configuration (with 0 warnings). o")~ Snort exiting |
8. OpenAppIDインストール
OpenAppIDエクステンションをインストールすると、Snortはアプリケーションレイヤーレベルでネットワーク脅威を検出できるようになります
①OpenAppIDをダウンロードし、展開
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# wget https://www.snort.org/downloads/openappid/33380 -O OpenAppId-33380.tgz # tar -xzvf OpenAppId-33380.tgz |
➁解凍したフォルダ（odp）を以下のディレクトリにコピー
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# cp -R odp /usr/local/lib/ |
➂メイン設定ファイルを編集し、OpenAppIDフォルダの場所を定義
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# vi /usr/local/etc/snort/snort.lua 104行目当たりに追加 appid = { -- appid requires this to use appids in rules app_detector_dir = '/usr/local/lib', log_stats = true, } appid_listener = { json_logging = true, file = "/var/log/snort/appid-output.log", } |
④ メイン構成の変更をテスト
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# snort -c /usr/local/etc/snort/snort.lua 正常であれば次のように表示される ... -------------------------------------------------- search engine (ac_bnfa) instances: 338 patterns: 10778 pattern chars: 175278 num states: 123344 num match states: 10498 memory scale: MB total memory: 3.68713 pattern memory: 0.577984 match list memory: 1.33597 transition memory: 1.73192 fast pattern only: 7099 appid: MaxRss diff: 225920 appid: patterns loaded: 11537 -------------------------------------------------- pcap DAQ configured to passive. Snort successfully validated the configuration (with 0 warnings). o")~ Snort exiting |
9. Snort用のsystemdサービスを作成
9.1 すべてのセットアップの確認
local.rulesを使ってネットワークインターフェース上でSnortを実行
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# snort -c /usr/local/etc/snort/snort.lua -R /usr/local/etc/snort/rules/local.rules -i ens33 -A alert_fast -s 65535 -k none |
同一ネットワークの別のPCからUbuntuサーバのIPアドレスにpingコマンドを送信
ホストサーバーのコンソールウィンドウに次のようなアラートログが表示されます
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03/05-10:21:57.153846 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.6 -> 192.168.11.83 03/05-10:21:57.153846 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.6 -> 192.168.11.83 03/05-10:21:57.153975 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.6 03/05-10:21:58.166597 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.6 -> 192.168.11.83 03/05-10:21:58.166598 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.6 -> 192.168.11.83 03/05-10:21:58.166780 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.6 03/05-10:21:58.167106 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.6 03/05-10:21:59.178071 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.6 -> 192.168.11.83 03/05-10:21:59.178072 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.6 -> 192.168.11.83 03/05-10:21:59.178233 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.6 03/05-10:21:59.178539 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.6 03/05-10:22:00.205383 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.6 -> 192.168.11.83 03/05-10:22:00.205384 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.6 -> 192.168.11.83 03/05-10:22:00.205555 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.6 03/05-10:22:00.205848 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.6 |
9.2 Snort用のsystemdサービスを作成
①Snortサービス用のユーザ（snort）を作成
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# useradd -r -s /usr/sbin/nologin -M snort |
➁ログフォルダの作成と権限の設定
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# mkdir /var/log/snort # chmod -R 5775 /var/log/snort # chown -R snort:snort /var/log/snort |
➂SNORT systemdサービスファイルを作成
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# touch /etc/systemd/system/snort3.service # vi /etc/systemd/system/snort3.service |
snort3.serviceの内容
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[Unit] Description=Snort3 IDS Daemon Service After=syslog.target network.target [Service] Type=simple ExecStart=/usr/local/bin/snort -c /usr/local/etc/snort/snort.lua -s 65535 -k none -l /var/log/snort -D -i ens33 -m 0x1b -u snort -g snort ExecStop=/bin/kill -9 $MAINPID [Install] WantedBy=multi-user.target |
④Snortサービスをリロードして有効
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# systemctl daemon-reload # systemctl enable --now snort3 Created symlink /etc/systemd/system/multi-user.target.wants/snort3.service → /etc/systemd/system/snort3.service. |
⑤Snortサービスを起動し、ステータスを確認
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# systemctl start snort3 # systemctl status snort3 ● snort3.service - Snort3 IDS Daemon Service Loaded: loaded (/etc/systemd/system/snort3.service; enabled; preset: enabled) Active: active (running) since Thu 2026-03-05 10:24:58 JST; 15s ago Main PID: 42205 (snort3) Tasks: 2 (limit: 4543) Memory: 213.1M (peak: 213.5M) CPU: 841ms CGroup: /system.slice/snort3.service └─42205 /usr/local/bin/snort -c /usr/local/etc/snort/snort.lua -s 65535 -> Mar 05 10:24:59 Lepard snort[42205]: any: 8 Mar 05 10:24:59 Lepard snort[42205]: to_server: 69 Mar 05 10:24:59 Lepard snort[42205]: to_client: 48 Mar 05 10:24:59 Lepard snort[42205]: -------------------------------------------------- Mar 05 10:24:59 Lepard snort[42205]: search engine (ac_bnfa) Mar 05 10:24:59 Lepard snort[42205]: instances: 334 Mar 05 10:24:59 Lepard snort[42205]: patterns: 10779 Mar 05 10:24:59 Lepard snort[42205]: pattern chars: 175202 Mar 05 10:24:59 Lepard snort[42205]: num states: 123205 Mar 05 10:24:59 Lepard snort[42205]: num match states: 10502 |
10. Snort JSONロギング設定
①Snort設定ファイルを編集
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# vi /usr/local/etc/snort/snort.lua 261行目 --7. configure outputsセクションの最後に追加 --------------------------------------------------------------------------- -- 7. configure outputs --------------------------------------------------------------------------- --------------- -- additional logs --packet_capture = { } --file_log = { } alert_json = { file = true, limit = 50, fields = 'timestamp msg pkt_num proto pkt_gen pkt_len dir src_addr src_port dst_addr dst_port service rule priority class action b64_data' } |
➁Snortを再起動
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# systemctl restart snort3 |
➂設定の確認
同一ネットワーク上の別のPCからUbuntuホストサーバにpingコマンドを実行
ログが記録され、Snort alert_json.txtファイルに保存されます。ログファイルを確認
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# tail -f /var/log/snort/alert_json.txt 次のようなログ結果が表示される { "timestamp" : "03/05-10:27:26.491212", "msg" : "Incoming ICMP", "pkt_num" : 359, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.6", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" } { "timestamp" : "03/05-10:27:26.491292", "msg" : "Incoming ICMP", "pkt_num" : 360, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.6", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" } { "timestamp" : "03/05-10:27:27.500890", "msg" : "Incoming ICMP", "pkt_num" : 369, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "C2S", "src_addr" : "192.168.11.6", "dst_addr" : "192.168.11.83", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" } { "timestamp" : "03/05-10:27:27.500890", "msg" : "Incoming ICMP", "pkt_num" : 370, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "C2S", "src_addr" : "192.168.11.6", "dst_addr" : "192.168.11.83", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" } { "timestamp" : "03/05-10:27:27.500971", "msg" : "Incoming ICMP", "pkt_num" : 371, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.6", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" } { "timestamp" : "03/05-10:27:27.501067", "msg" : "Incoming ICMP", "pkt_num" : 372, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.6", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" } { "timestamp" : "03/05-10:27:28.509713", "msg" : "Incoming ICMP", "pkt_num" : 377, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "C2S", "src_addr" : "192.168.11.6", "dst_addr" : "192.168.11.83", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" } { "timestamp" : "03/05-10:27:28.509714", "msg" : "Incoming ICMP", "pkt_num" : 378, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "C2S", "src_addr" : "192.168.11.6", "dst_addr" : "192.168.11.83", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" } { "timestamp" : "03/05-10:27:28.509761", "msg" : "Incoming ICMP", "pkt_num" : 379, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.6", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" } { "timestamp" : "03/05-10:27:28.509830", "msg" : "Incoming ICMP", "pkt_num" : 380, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.6", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" } |
11.ルールファイルの自動更新
Snort が不正アクセスの判断をするために参照するルールファイルを自動で最新化するoinkmaster をインストールする
11.1 Oinkmasterインストール
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# wget http://prdownloads.sourceforge.net/oinkmaster/oinkmaster-2.0.tar.gz # tar zxvf oinkmaster-2.0.tar.gz 下記ファイルを所定のディレクトリへコピー # cp oinkmaster-2.0/oinkmaster.pl /usr/local/bin/ # cp oinkmaster-2.0/oinkmaster.conf /etc/ # cp oinkmaster-2.0/oinkmaster.1 /usr/share/man/man1/ |
下記ファイル、ディレクトリーを削除
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# rm -rf oinkmaster-2.0 # rm -f oinkmaster-2.0.tar.gz |
11.2 Oink Codeの取得
Snortルールファイル(Sourcefire VRT Certified Rules)をダウンロードするには「Oink Code」が必要なので、「Oink Code」を取得する。
まず、SNORT公式ページにアクセスしユーザー登録を行い、登録したアカウント、パスワードでSign in後"Oinkcode"を表示し、コピーする。
11.3 Oinkmaster設定
Oinkmaster設定ファイルを編集
取得したOinkcodeを貼り付ける
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# vi /etc/oinkmaster.conf 56行目当たり : 下記を追加 <file_name>の箇所にはSNORTにサインイン後、使用しているSNORTバージョンに一致する最新のsnortrules-snapshot-xxxxx.tar.gzを貼り付ける <oinkcode>の箇所に取得したoinkcodeを貼り付ける url = http://www.snort.org/pub-bin/oinkmaster.cgi/<oinkcode>/<file_name> |
11.4 ダウンロードする(Oinkmaster実行)
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# oinkmaster.pl -o /usr/local/etc/snort/rules/ |
下記のように表示される
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[***] Results from Oinkmaster started 20260305 12:47:58 [***] [*] Rules modifications: [*] None. [*] Non-rule line modifications: [*] None. [+] Added files (consider updating your snort.conf to include them if needed): [+] -> includes.rules -> snort3-app-detect.rules -> snort3-browser-chrome.rules -> snort3-browser-firefox.rules -> snort3-browser-ie.rules -> snort3-browser-other.rules -> snort3-browser-plugins.rules -> snort3-browser-webkit.rules -> snort3-content-replace.rules -> snort3-exploit-kit.rules -> snort3-file-executable.rules -> snort3-file-flash.rules -> snort3-file-identify.rules -> snort3-file-image.rules -> snort3-file-java.rules -> snort3-file-multimedia.rules -> snort3-file-office.rules -> snort3-file-other.rules -> snort3-file-pdf.rules -> snort3-indicator-compromise.rules -> snort3-indicator-obfuscation.rules -> snort3-indicator-scan.rules -> snort3-indicator-shellcode.rules -> snort3-malware-backdoor.rules -> snort3-malware-cnc.rules -> snort3-malware-other.rules -> snort3-malware-tools.rules -> snort3-netbios.rules -> snort3-os-linux.rules -> snort3-os-mobile.rules -> snort3-os-other.rules -> snort3-os-solaris.rules -> snort3-os-windows.rules -> snort3-policy-multimedia.rules -> snort3-policy-other.rules -> snort3-policy-social.rules -> snort3-policy-spam.rules -> snort3-protocol-dns.rules -> snort3-protocol-finger.rules -> snort3-protocol-ftp.rules -> snort3-protocol-icmp.rules -> snort3-protocol-imap.rules -> snort3-protocol-nntp.rules -> snort3-protocol-other.rules -> snort3-protocol-pop.rules -> snort3-protocol-rpc.rules -> snort3-protocol-scada.rules -> snort3-protocol-services.rules -> snort3-protocol-snmp.rules -> snort3-protocol-telnet.rules -> snort3-protocol-tftp.rules -> snort3-protocol-voip.rules -> snort3-pua-adware.rules -> snort3-pua-other.rules -> snort3-pua-p2p.rules -> snort3-pua-toolbars.rules -> snort3-server-apache.rules -> snort3-server-iis.rules -> snort3-server-mail.rules -> snort3-server-mssql.rules -> snort3-server-mysql.rules -> snort3-server-oracle.rules -> snort3-server-other.rules -> snort3-server-samba.rules -> snort3-server-webapp.rules -> snort3-sql.rules -> snort3-x11.rules -> VRT-License.txt |
11.5 Oinkmaster定期自動実行設定
Oinkmaster定期自動実行スクリプト作成
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# vi /etc/cron.daily/snort-rule-update #!/bin/bash /usr/local/bin/oinkmaster.pl -o /usr/local/etc/snort/rules/ 2>&1 | logger -t oinkmaster systemctl restart snort3 > /dev/null |
スクリプトに実行権限
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# chmod +x /etc/cron.daily/snort-rule-update |
