Fedora37 ; SNORT2 , Suricata, Tripwire インストール

SNORT インストール

Snortは、 Linuxで使える侵入検知システム（IDS）です。ネットワーク型IDSは、ネットワーク上を流れる通信の内容を監視し、攻撃を受けているか否かを検出します。ポートスキャンなどは「攻撃」というよりも「攻撃のための事前調査」とした方が表現としては適切かもしれません。ネットワーク型IDSは、このポートスキャンなども検知できます。また、疑わしい通信を検出することで、侵入などの被害を未然に防ぐことができます。

1.事前準備

①CodeReady Red Hat リポジトリを追加し、必要なソフトウェアをインストールする

# dnf -y install bison flex libpcap-devel pcre-devel openssl-devel libdnet-devel libtirpc-devel libtool nghttp2 libnghttp2-devel

1	# dnf -y install bison flex libpcap-devel pcre-devel openssl-devel libdnet-devel libtirpc-devel libtool nghttp2 libnghttp2-devel

作業用ディレクトリー作成

# mkdir /var/src

1	# mkdir /var/src

②DAQ のインストール

# cd /var/src
# wget https://snort.org/downloads/snort/daq-2.0.7.tar.gz
# tar zxvf daq-2.0.7.tar.gz
# cd daq-2.0.7
# autoreconf -f -i
# ./configure
# make
# make install

# cd /var/src

# wget https://snort.org/downloads/snort/daq-2.0.7.tar.gz

# tar zxvf daq-2.0.7.tar.gz

# cd daq-2.0.7

# autoreconf -f -i

# ./configure

# make

# make install

③Lua のインストール

# cd /var/src
# wget http://luajit.org/download/LuaJIT-2.0.5.tar.gz
# tar -zxvf LuaJIT-2.0.5.tar.gz
# cd LuaJIT-2.0.5
# make
# make install

# cd /var/src

# wget http://luajit.org/download/LuaJIT-2.0.5.tar.gz

# tar -zxvf LuaJIT-2.0.5.tar.gz

# cd LuaJIT-2.0.5

# make

# make install

④偽のリリースファイルを作成

# /bin/cat << EOT >/etc/fedora-release
Fedora release 28 (Rawhide)
EOT

# /bin/cat << EOT >/etc/fedora-release

Fedora release 28 (Rawhide)

EOT

2. Snort をダウンロード、コンパイル、インストール

# cd /var/src
# wget https://www.snort.org/downloads/snort/snort-2.9.20.tar.gz
# tar -zxvf snort-2.9.20.tar.gz
# cd snort-2.9.20
# ./configure --enable-sourcefire

zlib.h が見つからずエラーが出た場合
# dnf install zlib-devel

再度
# ./configure --enable-sourcefire
# make
# make install
# ldconfig
# ln -s /usr/local/bin/snort /usr/sbin/snort

# cd /var/src

# wget https://www.snort.org/downloads/snort/snort-2.9.20.tar.gz

# tar -zxvf snort-2.9.20.tar.gz

# cd snort-2.9.20

# ./configure --enable-sourcefire

zlib.h が見つからずエラーが出た場合

# dnf install zlib-devel

再度

# ./configure --enable-sourcefire

# make

# make install

# ldconfig

# ln -s /usr/local/bin/snort /usr/sbin/snort

偽のリリースファイルを削除

# rm /etc/fedora-release

1	# rm /etc/fedora-release

3.グルーブとユーザー作成、必要なディレクトリー、ファイル作成

# groupadd snort
# useradd snort -r -s /sbin/nologin -c SNORT_IDS -g snort

1 2	# groupadd snort # useradd snort -r -s /sbin/nologin -c SNORT_IDS -g snort

# mkdir /etc/snort
# mkdir -p /etc/snort/rules
# mkdir /var/log/snort
# mkdir /usr/local/lib/snort_dynamicrules
# mkdir /etc/snort/preproc_rules

# chmod -R 5775 /etc/snort
# chmod -R 5775 /var/log/snort
# chmod -R 5775 /usr/local/lib/snort_dynamicrules
# chown -R snort:snort /etc/snort
# chown -R snort:snort /var/log/snort
# chown -R snort:snort /usr/local/lib/snort_dynamicrules

下記ファイル作成
# touch /etc/snort/rules/white_list.rules
# touch /etc/snort/rules/black_list.rules
# touch /etc/snort/rules/local.rules

# mkdir /etc/snort

# mkdir -p /etc/snort/rules

# mkdir /var/log/snort

# mkdir /usr/local/lib/snort_dynamicrules

# mkdir /etc/snort/preproc_rules

# chmod -R 5775 /etc/snort

# chmod -R 5775 /var/log/snort

# chmod -R 5775 /usr/local/lib/snort_dynamicrules

# chown -R snort:snort /etc/snort

# chown -R snort:snort /var/log/snort

# chown -R snort:snort /usr/local/lib/snort_dynamicrules

下記ファイル作成

# touch /etc/snort/rules/white_list.rules

# touch /etc/snort/rules/black_list.rules

# touch /etc/snort/rules/local.rules

設定ファイルのセットアップ・・・すべてのファイルを構成ディレクトリにコピーします

# cp /var/src/snort-2.9.20/etc/*.conf* /etc/snort
# cp /var/src/snort-2.9.20/etc/*.map* /etc/snort

1 2	# cp /var/src/snort-2.9.20/etc/.conf /etc/snort # cp /var/src/snort-2.9.20/etc/.map /etc/snort

4.コミュニティルールの使用

①コミュニティルールを取得

# wget https://www.snort.org/rules/community -O ~/community.tar.gz

1	# wget https://www.snort.org/rules/community -O ~/community.tar.gz

②ルールを抽出し、構成フォルダーにコピー

# tar -xvf ~/community.tar.gz -C ~/
# cp ~/community-rules/* /etc/snort/rules

1 2	# tar -xvf ~/community.tar.gz -C ~/ # cp ~/community-rules/* /etc/snort/rules

コミュニティルールに含まれていないさまざまなルールファイルがあるので、sedコマンドを使用して、不要な行を一括コメントアウトする

# sed -i 's/include \$RULE\_PATH/#include \$RULE\_PATH/' /etc/snort/snort.conf

1	# sed -i 's/include \$RULE\_PATH/#include \$RULE\_PATH/' /etc/snort/snort.conf

5. 登録済みユーザールールの取得

Snortのウェブサイトに登録すると、Oink コードを使用して登録済みユーザールールをダウンロードできます。Oink コードは Snort ユーザーアカウントの詳細にあります。
次のコマンドのoinkcode を取得した個人コードに置き換えます。

# wget https://www.snort.org/rules/snortrules-snapshot-29181.tar.gz?oinkcode=<oink-code> -O ~/registered.tar.gz

1	# wget https://www.snort.org/rules/snortrules-snapshot-29181.tar.gz?oinkcode=<oink-code> -O ~/registered.tar.gz

ダウンロードが完了したら、構成ディレクトリにルールを抽出

# tar -xvf ~/registered.tar.gz -C /etc/snort

1	# tar -xvf ~/registered.tar.gz -C /etc/snort

6. ネットワークおよびルールの構成

# vi /etc/snort/snort.conf

●45行目
# Setup the network addresses you are protecting
ipvar HOME_NET 192.168.11.0/24　←各自の環境に合わす
●48行目
# Set up the external network addresses. Leave as "any" in most situations
ipvar EXTERNAL_NET !$HOME_NET
●104-106行目　コメントアウトして下に追加
# Path to your rules files (this can be a relative path)
# var RULE_PATH ../rules
# var SO_RULE_PATH ../so_rules
# var PREPROC_RULE_PATH ../preproc_rules
var RULE_PATH /etc/snort/rules
var SO_RULE_PATH /etc/snort/so_rules
var PREPROC_RULE_PATH /etc/snort/preproc_rules
●115-116行目あたりコメントアウトして下に追加
# Set the absolute path appropriately
#var WHITE_LIST_PATH ../rules
#var BLACK_LIST_PATH ../rules
var WHITE_LIST_PATH /etc/snort/rules
var BLACK_LIST_PATH /etc/snort/rules
●525行目あたり追加
# unified2
# Recommended for most installs
output unified2: filename snort.log, limit 128
●550行目 カスタム ルールを読み込むため、local.rules のコメントを解除する
include $RULE_PATH/local.rules
●コミュニティ ルールを使用している場合はlocal.rules 行のすぐ下などに次の行も追加
include $RULE_PATH/community.rules

# vi /etc/snort/snort.conf

●45行目

# Setup the network addresses you are protecting

ipvar HOME_NET 192.168.11.0/24　←各自の環境に合わす

●48行目

# Set up the external network addresses. Leave as "any" in most situations

ipvar EXTERNAL_NET !$HOME_NET

●104-106行目　コメントアウトして下に追加

# Path to your rules files (this can be a relative path)

# var RULE_PATH ../rules

# var SO_RULE_PATH ../so_rules

# var PREPROC_RULE_PATH ../preproc_rules

var RULE_PATH /etc/snort/rules

var SO_RULE_PATH /etc/snort/so_rules

var PREPROC_RULE_PATH /etc/snort/preproc_rules

●115-116行目あたりコメントアウトして下に追加

# Set the absolute path appropriately

#var WHITE_LIST_PATH ../rules

#var BLACK_LIST_PATH ../rules

var WHITE_LIST_PATH /etc/snort/rules

var BLACK_LIST_PATH /etc/snort/rules

●525行目あたり追加

# unified2

# Recommended for most installs

output unified2: filename snort.log, limit 128

●550行目カスタムルールを読み込むため、local.rules のコメントを解除する

include $RULE_PATH/local.rules

●コミュニティルールを使用している場合はlocal.rules 行のすぐ下などに次の行も追加

include $RULE_PATH/community.rules

7. 設定の検証

パラメーター -T を使用して構成をテストし、テスト・モードを使用可能にします

# snort -T -c /etc/snort/rules/snort.conf

1	# snort -T -c /etc/snort/rules/snort.conf

エラーが出た場合該当のファイルを　/etc/snort/rulesにコピーする
当方の場合、下記のファイルでエラーが出た

# cp /var/src/snort-2.9.20/etc/classification.config /etc/snort/rules
# cp /var/src/snort-2.9.20/etc/reference.config /etc/snort/rules
# cp /var/src/snort-2.9.20/etc/threshold.conf /etc/snort/rules
# cp /var/src/snort-2.9.20/etc/unicode.map /etc/snort/rules/

# cp /var/src/snort-2.9.20/etc/classification.config /etc/snort/rules

# cp /var/src/snort-2.9.20/etc/reference.config /etc/snort/rules

# cp /var/src/snort-2.9.20/etc/threshold.conf /etc/snort/rules

# cp /var/src/snort-2.9.20/etc/unicode.map /etc/snort/rules/

また、「/etc/snort/rules/snort.conf(322) => Invalid keyword '}'」エラーが出る場合

# vi /etc/snort/rules/snort.conf

●321行目 : コメントアウト
#decompress_swf { deflate lzma } \

# vi /etc/snort/rules/snort.conf

●321行目 : コメントアウト

#decompress_swf { deflate lzma } \

再度次を実施する

# snort -T -c /etc/snort/rules/snort.conf

[ Number of patterns truncated to 20 bytes: 916 ]

MaxRss at the end of detection rules:825960

        --== Initialization Complete ==--

   ,,_     -*> Snort! <*-
  o"  )~   Version 2.9.20 GRE (Build 82)
   ''''    By Martin Roesch & The Snort Team: http://www.snort.org/contact#team
           Copyright (C) 2014-2022 Cisco and/or its affiliates. All rights reserved.
           Copyright (C) 1998-2013 Sourcefire, Inc., et al.
           Using libpcap version 1.10.3 (with TPACKET_V3)
           Using PCRE version: 8.45 2021-06-15
           Using ZLIB version: 1.2.12

           Rules Engine: SF_SNORT_DETECTION_ENGINE  Version 3.2  <Build 1>
           Preprocessor Object: appid  Version 1.1  <Build 5>
           Preprocessor Object: SF_S7COMMPLUS  Version 1.0  <Build 1>
           Preprocessor Object: SF_DNP3  Version 1.1  <Build 1>
           Preprocessor Object: SF_MODBUS  Version 1.1  <Build 1>
           Preprocessor Object: SF_GTP  Version 1.1  <Build 1>
           Preprocessor Object: SF_REPUTATION  Version 1.1  <Build 1>
           Preprocessor Object: SF_SIP  Version 1.1  <Build 1>
           Preprocessor Object: SF_SDF  Version 1.1  <Build 1>
           Preprocessor Object: SF_DCERPC2  Version 1.0  <Build 3>
           Preprocessor Object: SF_SSLPP  Version 1.1  <Build 4>
           Preprocessor Object: SF_DNS  Version 1.1  <Build 4>
           Preprocessor Object: SF_SSH  Version 1.1  <Build 3>
           Preprocessor Object: SF_SMTP  Version 1.1  <Build 9>
           Preprocessor Object: SF_IMAP  Version 1.0  <Build 1>
           Preprocessor Object: SF_POP  Version 1.0  <Build 1>
           Preprocessor Object: SF_FTPTELNET  Version 1.2  <Build 13>

Total snort Fixed Memory Cost - MaxRss:825960
Snort successfully validated the configuration!
Snort exiting

# snort -T -c /etc/snort/rules/snort.conf

[ Number of patterns truncated to 20 bytes: 916 ]

MaxRss at the end of detection rules:825960

--== Initialization Complete ==--

,,_ -*> Snort! <*-

o" )~ Version 2.9.20 GRE (Build 82)

'''' By Martin Roesch & The Snort Team: http://www.snort.org/contact#team

Using libpcap version 1.10.3 (with TPACKET_V3)

Using PCRE version: 8.45 2021-06-15

Using ZLIB version: 1.2.12

Rules Engine: SF_SNORT_DETECTION_ENGINE Version 3.2 <Build 1>

Preprocessor Object: appid Version 1.1 <Build 5>

Preprocessor Object: SF_S7COMMPLUS Version 1.0 <Build 1>

Preprocessor Object: SF_DNP3 Version 1.1 <Build 1>

Preprocessor Object: SF_MODBUS Version 1.1 <Build 1>

Preprocessor Object: SF_GTP Version 1.1 <Build 1>

Preprocessor Object: SF_REPUTATION Version 1.1 <Build 1>

Preprocessor Object: SF_SIP Version 1.1 <Build 1>

Preprocessor Object: SF_SDF Version 1.1 <Build 1>

Preprocessor Object: SF_DCERPC2 Version 1.0 <Build 3>

Preprocessor Object: SF_SSLPP Version 1.1 <Build 4>

Preprocessor Object: SF_DNS Version 1.1 <Build 4>

Preprocessor Object: SF_SSH Version 1.1 <Build 3>

Preprocessor Object: SF_SMTP Version 1.1 <Build 9>

Preprocessor Object: SF_IMAP Version 1.0 <Build 1>

Preprocessor Object: SF_POP Version 1.0 <Build 1>

Preprocessor Object: SF_FTPTELNET Version 1.2 <Build 13>

Total snort Fixed Memory Cost - MaxRss:825960

Snort successfully validated the configuration!

Snort exiting

8. 構成のテスト

①Snort がアラートをログに記録しているかどうかをテストするには、着信 ICMP 接続に関するカスタム検出ルールアラートを local.rules ファイルに追加します。

# vi /etc/snort/rules/local.rules

●最終行に追加
alert icmp any any -> $HOME_NET any (msg:"ICMP test"; sid:10000001; rev:001;)

# vi /etc/snort/rules/local.rules

●最終行に追加

alert icmp any any -> $HOME_NET any (msg:"ICMP test"; sid:10000001; rev:001;)

②コンソールで Snort を起動し、アラートを stdout に出力します。正しいネットワークインターフェイス(ens160 など)を選択する

# snort -A console -i ens160 -u snort -g snort -c /etc/snort/snort.conf

Snortを起動して実行した状態で、他のコンピューターから ping を実行します。Snort を実行しているターミナルに ICMP 呼び出しごとに次のような通知が表示されます

03/04-12:59:09.123471  [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.22 -> 192.168.11.83
03/04-12:59:09.123549  [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.83 -> 192.168.11.22
03/04-12:59:09.123866  [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.22 -> 192.168.11.83
03/04-12:59:09.123905  [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.83 -> 192.168.11.22
03/04-12:59:10.145661  [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.22 -> 192.168.11.83
03/04-12:59:10.145742  [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.83 -> 192.168.11.22
03/04-12:59:10.146056  [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.22 -> 192.168.11.83
03/04-12:59:10.146094  [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.83 -> 192.168.11.22

# snort -A console -i ens160 -u snort -g snort -c /etc/snort/snort.conf

Snortを起動して実行した状態で、他のコンピューターから ping を実行します。Snort を実行しているターミナルに ICMP 呼び出しごとに次のような通知が表示されます

03/04-12:59:09.123471 [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.22 -> 192.168.11.83

03/04-12:59:09.123549 [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.83 -> 192.168.11.22

03/04-12:59:09.123866 [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.22 -> 192.168.11.83

03/04-12:59:09.123905 [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.83 -> 192.168.11.22

03/04-12:59:10.145661 [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.22 -> 192.168.11.83

03/04-12:59:10.145742 [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.83 -> 192.168.11.22

03/04-12:59:10.146056 [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.22 -> 192.168.11.83

03/04-12:59:10.146094 [**] [1:10000001:1] ICMP test [**] [Priority: 0] {ICMP} 192.168.11.83 -> 192.168.11.22

9. バックグラウンドで Snortを実行する

①Snort のスタートアップスクリプトを作成

# vi /lib/systemd/system/snort.service

[Unit]
Description=Snort NIDS Daemon
After=syslog.target network.target

[Service]
Type=simple
ExecStart=/usr/local/bin/snort -q -u snort -g snort -c /etc/snort/snort.conf -i ens160

[Install]
WantedBy=multi-user.target

# vi /lib/systemd/system/snort.service

[Unit]

Description=Snort NIDS Daemon

After=syslog.target network.target

[Service]

Type=simple

ExecStart=/usr/local/bin/snort -q -u snort -g snort -c /etc/snort/snort.conf -i ens160

[Install]

WantedBy=multi-user.target

②サービスを定義した後、systemctl デーモンを再ロードし実行する

# systemctl daemon-reload
# systemctl start snort

1 2	# systemctl daemon-reload # systemctl start snort

Suricata インストール

SURICATA IDS/IPSはネットワーク上の通信を監視し、不審なトラフィックを検知するオープンソースのIDSです。基本的な仕組みはシグネチャ型であるため、あらかじめ設定した不正な通信を検知できます。また、Suricataは検知だけでなく防御も行えることが特徴です。

1.Suricata のインストールと設定

EPEL リポジトリをシステム上で有効化しておく

①Suricata 　インストール

#  dnf install suricata

1	# dnf install suricata

➁バージョン確認

# suricata -V
This is Suricata version 6.0.9 RELEASE

1 2	# suricata -V This is Suricata version 6.0.9 RELEASE

➂Suricataがネットワークパケットを検査するインターフェースとIPアドレスを決定

# ip --brief add
lo               UNKNOWN        127.0.0.1/8
ens160           UP             192.168.11.83/24

# ip --brief add

lo UNKNOWN 127.0.0.1/8

ens160 UP 192.168.11.83/24

④設定ファイルを編集

#  vi /etc/suricata/suricata.yaml

# 15行目 : varsセクションで、ネットワークを定義する
HOME_NET: "[192.168.11.0/24]"
EXTRNAL_NET: "!$HOME_NET"

# 589行目 : af-packetセクションのインターフェース名を設定
af-packet:
    - interface: ens160

# vi /etc/suricata/suricata.yaml

# 15行目 : varsセクションで、ネットワークを定義する

HOME_NET: "[192.168.11.0/24]"

EXTRNAL_NET: "!$HOME_NET"

# 589行目 : af-packetセクションのインターフェース名を設定

af-packet:

- interface: ens160

# vi /etc/sysconfig/suricata

# 8行目 :インターフェイスを指定
# Add options to be passed to the daemon
OPTIONS="-i ens160 --user suricata "

# vi /etc/sysconfig/suricata

# 8行目 :インターフェイスを指定

# Add options to be passed to the daemon

OPTIONS="-i ens160 --user suricata "

⑤Suricataのルール更新

# suricata-update

1	# suricata-update

-- [ERRCODE: SC_ERR_CONF_YAML_ERROR(242)] - App-Layer protocol sip enable status not set, so enabling by default. This behavior will change in Suricata 7, so please update your config. See ticket #4744 for more details.
上記のような警告が出るが無視できるものと思われるので、このまま進めます

⑥Suricataの起動

# systemctl enable --now suricata
Created symlink /etc/systemd/system/multiuser.target.wants/suricata.service → /usr/lib/systemd/system/suricata.service.

1 2	# systemctl enable --now suricata Created symlink /etc/systemd/system/multiuser.target.wants/suricata.service → /usr/lib/systemd/system/suricata.service.

⑦Suricataの起動確認

# systemctl status suricata

● suricata.service - Suricata Intrusion Detection Service
     Loaded: loaded (/usr/lib/systemd/system/suricata.service; enabled; preset:>
     Active: active (running) since Sat 2023-03-04 13:29:51 JST; 48s ago
       Docs: man:suricata(1)
    Process: 29990 ExecStartPre=/bin/rm -f /var/run/suricata.pid (code=exited, >
   Main PID: 29991 (Suricata-Main)
      Tasks: 8 (limit: 5320)
     Memory: 450.5M
        CPU: 19.609s
     CGroup: /system.slice/suricata.service
             mq29991 /sbin/suricata -c /etc/suricata/suricata.yaml --pidfile /v>

Mar 04 13:29:51 Lepard systemd[1]: Starting suricata.service - Suricata Intrusi>
Mar 04 13:29:51 Lepard systemd[1]: Started suricata.service - Suricata Intrusio>
Mar 04 13:29:51 Lepard suricata[29991]: 4/3/2023 -- 13:29:51 - <Notice> - This >
Mar 04 13:29:51 Lepard suricata[29991]: 4/3/2023 -- 13:29:51 - <Warning> - [ERR>
Mar 04 13:29:51 Lepard suricata[29991]: 4/3/2023 -- 13:29:51 - <Warning> - [ERR>
Mar 04 13:29:51 Lepard suricata[29991]: 4/3/2023 -- 13:29:51 - <Warning> - [ERR>
Mar 04 13:30:10 Lepard suricata[29991]: 4/3/2023 -- 13:30:10 - <Notice> - all 2

# systemctl status suricata

● suricata.service - Suricata Intrusion Detection Service

Loaded: loaded (/usr/lib/systemd/system/suricata.service; enabled; preset:>

Active: active (running) since Sat 2023-03-04 13:29:51 JST; 48s ago

Docs: man:suricata(1)

Process: 29990 ExecStartPre=/bin/rm -f /var/run/suricata.pid (code=exited, >

Main PID: 29991 (Suricata-Main)

Tasks: 8 (limit: 5320)

Memory: 450.5M

CPU: 19.609s

CGroup: /system.slice/suricata.service

mq29991 /sbin/suricata -c /etc/suricata/suricata.yaml --pidfile /v>

Mar 04 13:29:51 Lepard systemd[1]: Starting suricata.service - Suricata Intrusi>

Mar 04 13:29:51 Lepard systemd[1]: Started suricata.service - Suricata Intrusio>

Mar 04 13:29:51 Lepard suricata[29991]: 4/3/2023 -- 13:29:51 - <Notice> - This >

Mar 04 13:29:51 Lepard suricata[29991]: 4/3/2023 -- 13:29:51 - <Warning> - [ERR>

Mar 04 13:30:10 Lepard suricata[29991]: 4/3/2023 -- 13:30:10 - <Notice> - all 2

ログを確認

# tail /var/log/suricata/suricata.log

4/3/2023 -- 13:29:51 - <Info> - stats output device (regular) initialized: stats.log
4/3/2023 -- 13:29:51 - <Info> - Running in live mode, activating unix socket
4/3/2023 -- 13:30:02 - <Info> - 1 rule files processed. 33353 rules successfully loaded, 0 rules failed
4/3/2023 -- 13:30:02 - <Info> - Threshold config parsed: 0 rule(s) found
4/3/2023 -- 13:30:02 - <Info> - 33356 signatures processed. 1196 are IP-only rules, 5211 are inspecting packet payload, 26746 inspect application layer, 108 are decoder event only
4/3/2023 -- 13:30:10 - <Info> - Going to use 2 thread(s)
4/3/2023 -- 13:30:10 - <Info> - Running in live mode, activating unix socket
4/3/2023 -- 13:30:10 - <Info> - Using unix socket file '/var/run/suricata/suricata-command.socket'
4/3/2023 -- 13:30:10 - <Notice> - all 2 packet processing threads, 4 management threads initialized, engine started.
4/3/2023 -- 13:30:10 - <Info> - All AFP capture threads are running.

# tail /var/log/suricata/suricata.log

4/3/2023 -- 13:29:51 - <Info> - stats output device (regular) initialized: stats.log

4/3/2023 -- 13:29:51 - <Info> - Running in live mode, activating unix socket

4/3/2023 -- 13:30:02 - <Info> - 1 rule files processed. 33353 rules successfully loaded, 0 rules failed

4/3/2023 -- 13:30:02 - <Info> - Threshold config parsed: 0 rule(s) found

4/3/2023 -- 13:30:02 - <Info> - 33356 signatures processed. 1196 are IP-only rules, 5211 are inspecting packet payload, 26746 inspect application layer, 108 are decoder event only

4/3/2023 -- 13:30:10 - <Info> - Going to use 2 thread(s)

4/3/2023 -- 13:30:10 - <Info> - Running in live mode, activating unix socket

4/3/2023 -- 13:30:10 - <Info> - Using unix socket file '/var/run/suricata/suricata-command.socket'

4/3/2023 -- 13:30:10 - <Notice> - all 2 packet processing threads, 4 management threads initialized, engine started.

4/3/2023 -- 13:30:10 - <Info> - All AFP capture threads are running.

統計情報を確認するには、stats.log ファイルを確認します(デフォルトで8秒ごとに更新)

# tail -f /var/log/suricata/stats.log

1	# tail -f /var/log/suricata/stats.log

より高度な出力であるEVE JSONは、以下のコマンドで生成することができる

# tail -f /var/log/suricata/eve.json

1	# tail -f /var/log/suricata/eve.json

3.Suricata のテスト

①curl ユーティリティで ping テストを実行

# curl http://testmynids.org/uid/index.html
uid=0(root) gid=0(root) groups=0(root)

1 2	# curl http://testmynids.org/uid/index.html uid=0(root) gid=0(root) groups=0(root)

②ログに記録されたかどうかを調べるため、アラートログを確認

# cat /var/log/suricata/fast.log

03/04/2023-13:35:52.995900  [**] [1:2260002:1] SURICATA Applayer Detect protocol only one direction [**] [Classification: Generic Protocol Command Decode] [Priority: 3] {TCP} 192.168.11.83:25 -> 46.148.40.139:45912
03/04/2023-13:36:00.553297  [**] [1:2220000:1] SURICATA SMTP invalid reply [**] [Classification: Generic Protocol Command Decode] [Priority: 3] {TCP} 192.168.11.83:25 -> 46.148.40.139:45912

# cat /var/log/suricata/fast.log

03/04/2023-13:35:52.995900 [**] [1:2260002:1] SURICATA Applayer Detect protocol only one direction [**] [Classification: Generic Protocol Command Decode] [Priority: 3] {TCP} 192.168.11.83:25 -> 46.148.40.139:45912

03/04/2023-13:36:00.553297 [**] [1:2220000:1] SURICATA SMTP invalid reply [**] [Classification: Generic Protocol Command Decode] [Priority: 3] {TCP} 192.168.11.83:25 -> 46.148.40.139:45912

4.Suricata Rulesの設定

①Suricataにパッケージされているルールセットの表示

# ls -al /var/lib/suricata/rules/

total 23660
drwxr-s--- 2 root     suricata       57 Mar  4 13:27 .
drwxrws--- 4 suricata suricata       33 Mar  4 13:27 ..
-rw-r--r-- 1 root     suricata     3228 Mar  4 13:27 classification.config
-rw-r--r-- 1 root     suricata 24221556 Mar  4 13:27 suricata.rules

# ls -al /var/lib/suricata/rules/

total 23660

drwxr-s--- 2 root suricata 57 Mar 4 13:27 .

drwxrws--- 4 suricata suricata 33 Mar 4 13:27 ..

-rw-r--r-- 1 root suricata 3228 Mar 4 13:27 classification.config

-rw-r--r-- 1 root suricata 24221556 Mar 4 13:27 suricata.rules

②ルールセットを提供するソースのインデックス一覧

# suricata-update list-sources

Name: et/open
  Vendor: Proofpoint
  Summary: Emerging Threats Open Ruleset
  License: MIT
Name: et/pro
  Vendor: Proofpoint
  Summary: Emerging Threats Pro Ruleset
  License: Commercial
  Replaces: et/open
  Parameters: secret-code
  Subscription: https://www.proofpoint.com/us/threat-insight/et-pro-ruleset
Name: oisf/trafficid
  Vendor: OISF
  Summary: Suricata Traffic ID ruleset
  License: MIT
Name: scwx/enhanced
  Vendor: Secureworks
  Summary: Secureworks suricata-enhanced ruleset
  License: Commercial
  Parameters: secret-code
  Subscription: https://www.secureworks.com/contact/ (Please reference CTU Countermeasures)
Name: scwx/malware
  Vendor: Secureworks
  Summary: Secureworks suricata-malware ruleset
  License: Commercial
  Parameters: secret-code
  Subscription: https://www.secureworks.com/contact/ (Please reference CTU Countermeasures)
Name: scwx/security
  Vendor: Secureworks
  Summary: Secureworks suricata-security ruleset
  License: Commercial
  Parameters: secret-code
  Subscription: https://www.secureworks.com/contact/ (Please reference CTU Countermeasures)
Name: sslbl/ssl-fp-blacklist
  Vendor: Abuse.ch
  Summary: Abuse.ch SSL Blacklist
  License: Non-Commercial
Name: sslbl/ja3-fingerprints
  Vendor: Abuse.ch
  Summary: Abuse.ch Suricata JA3 Fingerprint Ruleset
  License: Non-Commercial
Name: etnetera/aggressive
  Vendor: Etnetera a.s.
  Summary: Etnetera aggressive IP blacklist
  License: MIT
Name: tgreen/hunting
  Vendor: tgreen
  Summary: Threat hunting rules
  License: GPLv3
Name: malsilo/win-malware
  Vendor: malsilo
  Summary: Commodity malware rules
  License: MIT
Name: stamus/lateral
  Vendor: Stamus Networks
  Summary: Lateral movement rules
  License: GPL-3.0-only

# suricata-update list-sources

Name: et/open

Vendor: Proofpoint

Summary: Emerging Threats Open Ruleset

License: MIT

Name: et/pro

Vendor: Proofpoint

Summary: Emerging Threats Pro Ruleset

License: Commercial

Replaces: et/open

Parameters: secret-code

Subscription: https://www.proofpoint.com/us/threat-insight/et-pro-ruleset

Name: oisf/trafficid

Vendor: OISF

Summary: Suricata Traffic ID ruleset

License: MIT

Name: scwx/enhanced

Vendor: Secureworks

Summary: Secureworks suricata-enhanced ruleset

License: Commercial

Parameters: secret-code

Subscription: https://www.secureworks.com/contact/ (Please reference CTU Countermeasures)

Name: scwx/malware

Vendor: Secureworks

Summary: Secureworks suricata-malware ruleset

License: Commercial

Parameters: secret-code

Subscription: https://www.secureworks.com/contact/ (Please reference CTU Countermeasures)

Name: scwx/security

Vendor: Secureworks

Summary: Secureworks suricata-security ruleset

License: Commercial

Parameters: secret-code

Subscription: https://www.secureworks.com/contact/ (Please reference CTU Countermeasures)

Name: sslbl/ssl-fp-blacklist

Vendor: Abuse.ch

Summary: Abuse.ch SSL Blacklist

License: Non-Commercial

Name: sslbl/ja3-fingerprints

Vendor: Abuse.ch

Summary: Abuse.ch Suricata JA3 Fingerprint Ruleset

License: Non-Commercial

Name: etnetera/aggressive

Vendor: Etnetera a.s.

Summary: Etnetera aggressive IP blacklist

License: MIT

Name: tgreen/hunting

Vendor: tgreen

Summary: Threat hunting rules

License: GPLv3

Name: malsilo/win-malware

Vendor: malsilo

Summary: Commodity malware rules

License: MIT

Name: stamus/lateral

Vendor: Stamus Networks

Summary: Lateral movement rules

License: GPL-3.0-only

③ソースを有効にする(et/openを有効にする場合)

# suricata-update enable-source et/open

4/3/2023 -- 13:40:27 - <Info> -- Using data-directory /var/lib/suricata.
4/3/2023 -- 13:40:27 - <Info> -- Using Suricata configuration /etc/suricata/suricata.yaml
4/3/2023 -- 13:40:27 - <Info> -- Using /usr/share/suricata/rules for Suricata provided rules.
4/3/2023 -- 13:40:27 - <Info> -- Found Suricata version 6.0.9 at /usr/sbin/suricata.
4/3/2023 -- 13:40:27 - <Info> -- Creating directory /var/lib/suricata/update/sources
4/3/2023 -- 13:40:27 - <Info> -- Source et/open enabled

# suricata-update enable-source et/open

4/3/2023 -- 13:40:27 - <Info> -- Using data-directory /var/lib/suricata.

4/3/2023 -- 13:40:27 - <Info> -- Using Suricata configuration /etc/suricata/suricata.yaml

4/3/2023 -- 13:40:27 - <Info> -- Using /usr/share/suricata/rules for Suricata provided rules.

4/3/2023 -- 13:40:27 - <Info> -- Found Suricata version 6.0.9 at /usr/sbin/suricata.

4/3/2023 -- 13:40:27 - <Info> -- Creating directory /var/lib/suricata/update/sources

4/3/2023 -- 13:40:27 - <Info> -- Source et/open enabled

アップデートを実行

# suricata-update

1	# suricata-update

Suricata service再起動

# systemctl restart suricata

1	# systemctl restart suricata

5.Suricata Custom Rulesの作成

①カスタマールールを含むファイルを新規作成

# vi /etc/suricata/rules/local.rules
下記内容を記載
alert icmp any any -> $HOME_NET any (msg:"ICMP Ping"; sid:1; rev:1;)

# vi /etc/suricata/rules/local.rules

下記内容を記載

alert icmp any any -> $HOME_NET any (msg:"ICMP Ping"; sid:1; rev:1;)

②設定ファイルを編集(上記local.rulesのパスを定義)

# vi /etc/suricata/suricata.yaml

# 1924行目あたりに追記
default-rule-path: /var/lib/suricata/rules

rule-files:
  - suricata.rules
  - /etc/suricata/rules/local.rules

# vi /etc/suricata/suricata.yaml

# 1924行目あたりに追記

default-rule-path: /var/lib/suricata/rules

rule-files:

- suricata.rules

- /etc/suricata/rules/local.rules

③設定ファイルのテスト

# suricata -T -c /etc/suricata/suricata.yaml -v

4/3/2023 -- 14:01:05 - <Info> - fast output device (regular) initialized: fast.log
4/3/2023 -- 14:01:05 - <Info> - eve-log output device (regular) initialized: eve.json
4/3/2023 -- 14:01:05 - <Info> - stats output device (regular) initialized: stats.log
4/3/2023 -- 14:01:16 - <Info> - 2 rule files processed. 33354 rules successfully loaded, 0 rules failed
4/3/2023 -- 14:01:16 - <Info> - Threshold config parsed: 0 rule(s) found
4/3/2023 -- 14:01:16 - <Info> - 33357 signatures processed. 1197 are IP-only rules, 5211 are inspecting packet payload, 26746 inspect application layer, 108 are decoder event only
4/3/2023 -- 14:01:24 - <Notice> - Configuration provided was successfully loaded. Exiting.
4/3/2023 -- 14:01:24 - <Info> - cleaning up signature grouping structure... complete

# suricata -T -c /etc/suricata/suricata.yaml -v

4/3/2023 -- 14:01:05 - <Info> - fast output device (regular) initialized: fast.log

4/3/2023 -- 14:01:05 - <Info> - eve-log output device (regular) initialized: eve.json

4/3/2023 -- 14:01:05 - <Info> - stats output device (regular) initialized: stats.log

4/3/2023 -- 14:01:16 - <Info> - 2 rule files processed. 33354 rules successfully loaded, 0 rules failed

4/3/2023 -- 14:01:16 - <Info> - Threshold config parsed: 0 rule(s) found

4/3/2023 -- 14:01:16 - <Info> - 33357 signatures processed. 1197 are IP-only rules, 5211 are inspecting packet payload, 26746 inspect application layer, 108 are decoder event only

4/3/2023 -- 14:01:24 - <Notice> - Configuration provided was successfully loaded. Exiting.

4/3/2023 -- 14:01:24 - <Info> - cleaning up signature grouping structure... complete

Suricat service再起動

# systemctl restart suricata

1	# systemctl restart suricata

④Custom Rulesの適用テスト

同一ローカルネットワーク上の別のデバイスでpingを実行し、ログに記録されたかどうかを確認する

# cat /var/log/suricata/fast.log

03/04/2023-14:03:40.042219  [**] [1:1:1] ICMP Ping [**] [Classification: (null)] [Priority: 3] {ICMP} 192.168.11.1:11 -> 192.168.11.83:0
03/04/2023-14:03:40.315823  [**] [1:2260002:1] SURICATA Applayer Detect protocol only one direction [**] [Classification: Generic Protocol Command Decode] [Priority: 3] {TCP} 192.168.11.83:25 -> 46.148.40.139:8258
03/04/2023-14:03:47.820592  [**] [1:2220000:1] SURICATA SMTP invalid reply [**] [Classification: Generic Protocol Command Decode] [Priority: 3] {TCP} 192.168.11.83:25 -> 46.148.40.139:8258
03/04/2023-14:03:55.542296  [**] [1:1:1] ICMP Ping [**] [Classification: (null)] [Priority: 3] {ICMP} 192.168.11.1:11 -> 192.168.11.83:0
03/04/2023-14:03:55.871283  [**] [1:2260002:1] SURICATA Applayer Detect protocol only one direction [**] [Classification: Generic Protocol Command Decode] [Priority: 3] {TCP} 192.168.11.83:25 -> 46.148.40.139:64670

# cat /var/log/suricata/fast.log

03/04/2023-14:03:40.042219 [**] [1:1:1] ICMP Ping [**] [Classification: (null)] [Priority: 3] {ICMP} 192.168.11.1:11 -> 192.168.11.83:0

03/04/2023-14:03:40.315823 [**] [1:2260002:1] SURICATA Applayer Detect protocol only one direction [**] [Classification: Generic Protocol Command Decode] [Priority: 3] {TCP} 192.168.11.83:25 -> 46.148.40.139:8258

03/04/2023-14:03:47.820592 [**] [1:2220000:1] SURICATA SMTP invalid reply [**] [Classification: Generic Protocol Command Decode] [Priority: 3] {TCP} 192.168.11.83:25 -> 46.148.40.139:8258

03/04/2023-14:03:55.542296 [**] [1:1:1] ICMP Ping [**] [Classification: (null)] [Priority: 3] {ICMP} 192.168.11.1:11 -> 192.168.11.83:0

03/04/2023-14:03:55.871283 [**] [1:2260002:1] SURICATA Applayer Detect protocol only one direction [**] [Classification: Generic Protocol Command Decode] [Priority: 3] {TCP} 192.168.11.83:25 -> 46.148.40.139:64670

JSON形式のログを取得するには、システムにjqをインストールする

# dnf install jq
# systemctl restart suricata

1 2	# dnf install jq # systemctl restart suricata

下記コマンドを実行し、同一ローカルネットワーク上の別のデバイスでpingを実行する

# tail -f /var/log/suricata/eve.json | jq 'select(.event_type=="alert")'
pingを実行するとコンソールに下記のように表示される
{
  "timestamp": "2023-02-04T16:10:25.334104+0900",
  "flow_id": 849355223406872,
  "in_iface": "ens160",
  "event_type": "alert",
  "src_ip": "192.168.11.22",
  "src_port": 0,
  "dest_ip": "192.168.11.83",
  "dest_port": 0,
  "proto": "ICMP",
  "icmp_type": 8,
  "icmp_code": 0,
  "alert": {
    "action": "allowed",
    "gid": 1,
    "signature_id": 1,
    "rev": 1,
    "signature": "ICMP Ping",
    "category": "",
    "severity": 3
  },
  "flow": {
    "pkts_toserver": 1,
    "pkts_toclient": 0,
    "bytes_toserver": 74,
    "bytes_toclient": 0,
    "start": "2023-02-04T16:10:25.334104+0900"
  }
}

# tail -f /var/log/suricata/eve.json | jq 'select(.event_type=="alert")'

pingを実行するとコンソールに下記のように表示される

{

"timestamp": "2023-02-04T16:10:25.334104+0900",

"flow_id": 849355223406872,

"in_iface": "ens160",

"event_type": "alert",

"src_ip": "192.168.11.22",

"src_port": 0,

"dest_ip": "192.168.11.83",

"dest_port": 0,

"proto": "ICMP",

"icmp_type": 8,

"icmp_code": 0,

"alert": {

"action": "allowed",

"gid": 1,

"signature_id": 1,

"rev": 1,

"signature": "ICMP Ping",

"category": "",

"severity": 3

"flow": {

"pkts_toserver": 1,

"pkts_toclient": 0,

"bytes_toserver": 74,

"bytes_toclient": 0,

"start": "2023-02-04T16:10:25.334104+0900"

}

Tripwire インストール

1.インストール

# dnf -y install tripwire

1	# dnf -y install tripwire

2.パスフレーズ設定

# tripwire-setup-keyfiles

----------------------------------------------
The Tripwire site and local passphrases are used to sign a  variety  of
files, such as the configuration, policy, and database files.

Passphrases should be at least 8 characters in length and contain  both
letters and numbers.

See the Tripwire manual for more information.

----------------------------------------------
Creating key files...

(When selecting a passphrase, keep in mind that good passphrases typically
have upper and lower case letters, digits and punctuation marks, and are
at least 8 characters in length.)

Enter the site keyfile passphrase:  ←任意の「サイトパスフレーズ」を入力
Verify the site keyfile passphrase: ←再度「サイトパスフレーズ」を入力
Generating key (this may take several minutes)...Key generation complete.

(When selecting a passphrase, keep in mind that good passphrases typically
have upper and lower case letters, digits and punctuation marks, and are
at least 8 characters in length.)

Enter the local keyfile passphrase:  ←任意の「ローカルパスフレーズ」を入力
Verify the local keyfile passphrase: ←再度「ローカルパスフレーズ」を入力
Generating key (this may take several minutes)...Key generation complete.

----------------------------------------------
Signing configuration file...
Please enter your site passphrase:  ←「サイトパスフレーズ」を入力
Wrote configuration file: /etc/tripwire/tw.cfg

A clear-text version of the Tripwire configuration file:
/etc/tripwire/twcfg.txt
has been preserved for your inspection.  It  is  recommended  that  you
move this file to a secure location and/or encrypt it in place (using a
tool such as GPG, for example) after you have examined it.


----------------------------------------------
Signing policy file...
Please enter your site passphrase:  ←「サイトパスフレーズ」を入力
Wrote policy file: /etc/tripwire/tw.pol

A clear-text version of the Tripwire policy file:
/etc/tripwire/twpol.txt
has been preserved for  your  inspection.  This  implements  a  minimal
policy, intended only to test  essential  Tripwire  functionality.  You
should edit the policy file to  describe  your  system,  and  then  use
twadmin to generate a new signed copy of the Tripwire policy.

Once you have a satisfactory Tripwire policy file, you should move  the
clear-text version to a secure location  and/or  encrypt  it  in  place
(using a tool such as GPG, for example).

Now run "tripwire --init" to enter Database Initialization  Mode.  This
reads the policy file, generates a database based on its contents,  and
then cryptographically signs the resulting  database.  Options  can  be
entered on the command line to specify which policy, configuration, and
key files are used  to  create  the  database.  The  filename  for  the
database can be specified as well. If no  options  are  specified,  the
default values from the current configuration file are used.

# tripwire-setup-keyfiles

----------------------------------------------

The Tripwire site and local passphrases are used to sign a variety of

files, such as the configuration, policy, and database files.

Passphrases should be at least 8 characters in length and contain both

letters and numbers.

See the Tripwire manual for more information.

----------------------------------------------

Creating key files...

(When selecting a passphrase, keep in mind that good passphrases typically

have upper and lower case letters, digits and punctuation marks, and are

at least 8 characters in length.)

Enter the site keyfile passphrase: ←任意の「サイトパスフレーズ」を入力

Verify the site keyfile passphrase: ←再度「サイトパスフレーズ」を入力

Generating key (this may take several minutes)...Key generation complete.

(When selecting a passphrase, keep in mind that good passphrases typically

have upper and lower case letters, digits and punctuation marks, and are

at least 8 characters in length.)

Enter the local keyfile passphrase: ←任意の「ローカルパスフレーズ」を入力

Verify the local keyfile passphrase: ←再度「ローカルパスフレーズ」を入力

Generating key (this may take several minutes)...Key generation complete.

----------------------------------------------

Signing configuration file...

Please enter your site passphrase: ←「サイトパスフレーズ」を入力

Wrote configuration file: /etc/tripwire/tw.cfg

A clear-text version of the Tripwire configuration file:

/etc/tripwire/twcfg.txt

has been preserved for your inspection. It is recommended that you

move this file to a secure location and/or encrypt it in place (using a

tool such as GPG, for example) after you have examined it.

----------------------------------------------

Signing policy file...

Please enter your site passphrase: ←「サイトパスフレーズ」を入力

Wrote policy file: /etc/tripwire/tw.pol

A clear-text version of the Tripwire policy file:

/etc/tripwire/twpol.txt

has been preserved for your inspection. This implements a minimal

policy, intended only to test essential Tripwire functionality. You

should edit the policy file to describe your system, and then use

twadmin to generate a new signed copy of the Tripwire policy.

Once you have a satisfactory Tripwire policy file, you should move the

clear-text version to a secure location and/or encrypt it in place

(using a tool such as GPG, for example).

Now run "tripwire --init" to enter Database Initialization Mode. This

reads the policy file, generates a database based on its contents, and

then cryptographically signs the resulting database. Options can be

entered on the command line to specify which policy, configuration, and

key files are used to create the database. The filename for the

database can be specified as well. If no options are specified, the

default values from the current configuration file are used.

3.Tripwire の設定

①設定ファイル編集

# vi /etc/tripwire/twcfg.txt

●9 行目あたり
行頭に「#」を追加し、その下の行に「LOOSEDIRECTORYCHECKING =true」を追加します。
●12 行目あたり
行頭に「#」を追加し、その下の行に「REPORTLEVEL =4」を追加します。
レベル4 にすることで「0 」～「4 」までの5 段階中、最も詳細なレポートが表示されます。
#REPORTLEVEL =3
REPORTLEVEL =4

# vi /etc/tripwire/twcfg.txt

●9 行目あたり

行頭に「#」を追加し、その下の行に「LOOSEDIRECTORYCHECKING =true」を追加します。

●12 行目あたり

行頭に「#」を追加し、その下の行に「REPORTLEVEL =4」を追加します。

レベル4 にすることで「0 」～「4 」までの5 段階中、最も詳細なレポートが表示されます。

#REPORTLEVEL =3

REPORTLEVEL =4

②Tripwire 設定ファイル(暗号署名版)を作成

# twadmin -m F -c /etc/tripwire/tw.cfg -S /etc/tripwire/site.key /etc/tripwire/twcfg.txt
Please enter your site passphrase: ←サイトパスフレーズを入力
Wrote configuration file: /etc/tripwire/tw.cfg

# twadmin -m F -c /etc/tripwire/tw.cfg -S /etc/tripwire/site.key /etc/tripwire/twcfg.txt

Please enter your site passphrase: ←サイトパスフレーズを入力

Wrote configuration file: /etc/tripwire/tw.cfg

③Tripwire 設定ファイル(テキスト版)削除

# rm -f /etc/tripwire/twcfg.txt

1	# rm -f /etc/tripwire/twcfg.txt

④ポリシーファイル設定

# cd /etc/tripwire/
# vi twpolmake.pl

1 2	# cd /etc/tripwire/ # vi twpolmake.pl

twpolmake.plの内容

#!/usr/bin/perl
# Tripwire Policy File customize tool
#
$POLFILE=$ARGV[0];

open(POL,"$POLFILE") or die "open error: $POLFILE" ;
my($myhost,$thost) ;
my($sharp,$tpath,$cond) ;
my($INRULE) = 0 ;

while (<POL>) {
chomp;
if (($thost) = /^HOSTNAME\s*=\s*(.*)\s*;/) {
$myhost = `hostname` ; chomp($myhost) ;
if ($thost ne $myhost) {
$_="HOSTNAME=\"$myhost\";" ;
}
}
elsif ( /^{/ ) {
$INRULE=1 ;
}
elsif ( /^}/ ) {
$INRULE=0 ;
}
elsif ($INRULE == 1 and ($sharp,$tpath,$cond) = /^(\s*\#?\s*)(\/\S+)\b(\s+->\s+.+)$/) {
$ret = ($sharp =~ s/\#//g) ;
if ($tpath eq '/sbin/e2fsadm' ) {
$cond =~ s/;\s+(tune2fs.*)$/; \#$1/ ;
}
if (! -s $tpath) {
$_ = "$sharp#$tpath$cond" if ($ret == 0) ;
}
else {
$_ = "$sharp$tpath$cond" ;
}
}
print "$_\n" ;
}
close(POL) ;

#!/usr/bin/perl

# Tripwire Policy File customize tool

$POLFILE=$ARGV[0];

open(POL,"$POLFILE") or die "open error: $POLFILE" ;

my($myhost,$thost) ;

my($sharp,$tpath,$cond) ;

my($INRULE) = 0 ;

while (<POL>) {

chomp;

if (($thost) = /^HOSTNAME\s*=\s*(.*)\s*;/) {

$myhost = `hostname` ; chomp($myhost) ;

if ($thost ne $myhost) {

$_="HOSTNAME=\"$myhost\";" ;

}

elsif ( /^{/ ) {

$INRULE=1 ;

}

elsif ( /^}/ ) {

$INRULE=0 ;

}

elsif ($INRULE == 1 and ($sharp,$tpath,$cond) = /^(\s*\#?\s*)(\/\S+)\b(\s+->\s+.+)$/) {

$ret = ($sharp =~ s/\#//g) ;

if ($tpath eq '/sbin/e2fsadm' ) {

$cond =~ s/;\s+(tune2fs.*)$/; \#$1/ ;

}

if (! -s $tpath) {

$_ = "$sharp#$tpath$cond" if ($ret == 0) ;

}

else {

$_ = "$sharp$tpath$cond" ;

}

print "$_\n" ;

}

close(POL) ;

⑤ポリシーファイル最適化

# perl /etc/tripwire/twpolmake.pl /etc/tripwire/twpol.txt > /etc/tripwire/twpol.txt.new

1	# perl /etc/tripwire/twpolmake.pl /etc/tripwire/twpol.txt > /etc/tripwire/twpol.txt.new

⑥最適化済ポリシーファイルを元に、ポリシーファイル(暗号署名版)作成

# twadmin -m P -c /etc/tripwire/tw.cfg -p /etc/tripwire/tw.pol -S /etc/tripwire/site.key /etc/tripwire/twpol.txt.new

Please enter your site passphrase: ←サイトパスフレーズを入力
Wrote policy file: /etc/tripwire/tw.pol

# twadmin -m P -c /etc/tripwire/tw.cfg -p /etc/tripwire/tw.pol -S /etc/tripwire/site.key /etc/tripwire/twpol.txt.new

Please enter your site passphrase: ←サイトパスフレーズを入力

Wrote policy file: /etc/tripwire/tw.pol

⑦データベースを作成、動作確認

# tripwire -m i -s -c /etc/tripwire/tw.cfg
Please enter your local passphrase: ←ローカルパスフレーズを入力

1 2	# tripwire -m i -s -c /etc/tripwire/tw.cfg Please enter your local passphrase: ←ローカルパスフレーズを入力

テスト用ファイルを作成

# echo test > /root/test.txt

1	# echo test > /root/test.txt

Tripwire の動作確認

# tripwire -m c -s -c /etc/tripwire/tw.cfg
下記のように表示されればOK

Open Source Tripwire(R) 2.4.3.7 Integrity Check Report

Report generated by:          root
Report created on:            Sat 04 Mar 2023 03:04:12 PM
Database last updated on:     Never

===============================================================================
Report Summary:
===============================================================================

Host name:                    Lepard
Host IP address:              192.168.11.83
Host ID:                      None
Policy file used:             /etc/tripwire/tw.pol
Configuration file used:      /etc/tripwire/tw.cfg
Database file used:           /var/lib/tripwire/Lepard.twd
Command line used:            tripwire -m c -s -c /etc/tripwire/tw.cfg

===============================================================================
Rule Summary:
===============================================================================

-------------------------------------------------------------------------------
  Section: Unix File System
-------------------------------------------------------------------------------

  Rule Name                       Severity Level    Added    Removed  Modified
  ---------                       --------------    -----    -------  --------
  User binaries                   66                0        0        0
  Tripwire Binaries               100               0        0        0
  Libraries                       66                0        0        0
  Operating System Utilities      100               0        0        0
  File System and Disk Administraton Programs
                                  100               0        0        0
  Kernel Administration Programs  100               0        0        0
  Networking Programs             100               0        0        0
  System Administration Programs  100               0        0        0
  Hardware and Device Control Programs
                                  100               0        0        0
  System Information Programs     100               0        0        0
  (/sbin/runlevel)
  Application Information Programs
                                  100               0        0        0
  (/sbin/rtmon)
  Critical Utility Sym-Links      100               0        0        0
  Shell Binaries                  100               0        0        0
  Critical system boot files      100               0        0        0
* Tripwire Data Files             100               1        0        0
  System boot changes             100               0        0        0
  OS executables and libraries    100               0        0        0
  Security Control                100               0        0        0
  Login Scripts                   100               0        0        0
  Critical configuration files    100               0        0        0
* Root config files               100               1        0        0
  Invariant Directories           66                0        0        0
  Temporary directories           33                0        0        0
  Critical devices                100               0        0        0
  (/proc/kcore)

Total objects scanned:  34742
Total violations found:  2

===============================================================================
Object Summary:
===============================================================================

-------------------------------------------------------------------------------
# Section: Unix File System
-------------------------------------------------------------------------------

-------------------------------------------------------------------------------
Rule Name: Tripwire Data Files (/var/lib/tripwire)
Severity Level: 100
-------------------------------------------------------------------------------

Added:
"/var/lib/tripwire/Lepard.twd"

-------------------------------------------------------------------------------
Rule Name: Root config files (/root)
Severity Level: 100
-------------------------------------------------------------------------------

Added:
"/root/test.txt"

===============================================================================
Error Report:
===============================================================================

No Errors

-------------------------------------------------------------------------------
*** End of report ***

Open Source Tripwire 2.4 Portions copyright 2000-2018 Tripwire, Inc.  Tripwire is a registered
trademark of Tripwire, Inc. This software comes with ABSOLUTELY NO WARRANTY;
for details use --version. This is free software which may be redistributed
or modified only under certain conditions; see COPYING for details.
All rights reserved.

100

101

102

103

# tripwire -m c -s -c /etc/tripwire/tw.cfg

下記のように表示されればOK

Open Source Tripwire(R) 2.4.3.7 Integrity Check Report

Report generated by: root

Report created on: Sat 04 Mar 2023 03:04:12 PM

Database last updated on: Never

===============================================================================

Report Summary:

===============================================================================

Host name: Lepard

Host IP address: 192.168.11.83

Host ID: None

Policy file used: /etc/tripwire/tw.pol

Configuration file used: /etc/tripwire/tw.cfg

Database file used: /var/lib/tripwire/Lepard.twd

Command line used: tripwire -m c -s -c /etc/tripwire/tw.cfg

===============================================================================

Rule Summary:

===============================================================================

-------------------------------------------------------------------------------

Section: Unix File System

-------------------------------------------------------------------------------

Rule Name Severity Level Added Removed Modified

--------- -------------- ----- ------- --------

User binaries 66 0 0 0

Tripwire Binaries 100 0 0 0

Libraries 66 0 0 0

Operating System Utilities 100 0 0 0

File System and Disk Administraton Programs

100 0 0 0

Kernel Administration Programs 100 0 0 0

Networking Programs 100 0 0 0

System Administration Programs 100 0 0 0

Hardware and Device Control Programs

100 0 0 0

System Information Programs 100 0 0 0

(/sbin/runlevel)

Application Information Programs

100 0 0 0

(/sbin/rtmon)

Critical Utility Sym-Links 100 0 0 0

Shell Binaries 100 0 0 0

Critical system boot files 100 0 0 0

* Tripwire Data Files 100 1 0 0

System boot changes 100 0 0 0

OS executables and libraries 100 0 0 0

Security Control 100 0 0 0

Critical configuration files 100 0 0 0

* Root config files 100 1 0 0

Invariant Directories 66 0 0 0

Temporary directories 33 0 0 0

Critical devices 100 0 0 0

(/proc/kcore)

Total objects scanned: 34742

Total violations found: 2

===============================================================================

Object Summary:

===============================================================================

-------------------------------------------------------------------------------

# Section: Unix File System

-------------------------------------------------------------------------------

Rule Name: Tripwire Data Files (/var/lib/tripwire)

Severity Level: 100

-------------------------------------------------------------------------------

Added:

"/var/lib/tripwire/Lepard.twd"

-------------------------------------------------------------------------------

Rule Name: Root config files (/root)

Severity Level: 100

-------------------------------------------------------------------------------

Added:

"/root/test.txt"

===============================================================================

Error Report:

===============================================================================

No Errors

-------------------------------------------------------------------------------

*** End of report ***

trademark of Tripwire, Inc. This software comes with ABSOLUTELY NO WARRANTY;

for details use --version. This is free software which may be redistributed

or modified only under certain conditions; see COPYING for details.

テスト用ファイルを削除

# rm -f /root/test.txt

1	# rm -f /root/test.txt

⑧Tripwire 定期実行スクリプト

# cd /var/www/system
# vi tripwire.sh

1 2	# cd /var/www/system # vi tripwire.sh

tripwire.shの内容

#!/bin/bash

PATH=/usr/sbin:/usr/bin:/bin:/usr/local/tripwire/sbin

# パスフレーズ設定
LOCALPASS= ←ローカルパスフレーズ
SITEPASS= 　←サイトパスフレーズ

cd /etc/tripwire

# Tripwireチェック実行
tripwire -m c -s -c tw.cfg|mail -s "Tripwire(R) Integrity Check Report in `hostname`" root

# ポリシーファイル最新化
twadmin -m p -c tw.cfg -p tw.pol -S site.key > twpol.txt
perl twpolmake.pl twpol.txt > twpol.txt.new
twadmin -m P -c tw.cfg -p tw.pol -S site.key -Q $SITEPASS twpol.txt.new > /dev/null
rm -f twpol.txt* *.bak

# データベース最新化
rm -f /usr/local/tripwire/lib/tripwire/*.twd*
tripwire -m i -s -c tw.cfg -P $LOCALPASS

#!/bin/bash

PATH=/usr/sbin:/usr/bin:/bin:/usr/local/tripwire/sbin

# パスフレーズ設定

LOCALPASS= ←ローカルパスフレーズ

SITEPASS= 　←サイトパスフレーズ

cd /etc/tripwire

# Tripwireチェック実行

tripwire -m c -s -c tw.cfg|mail -s "Tripwire(R) Integrity Check Report in `hostname`" root

# ポリシーファイル最新化

twadmin -m p -c tw.cfg -p tw.pol -S site.key > twpol.txt

perl twpolmake.pl twpol.txt > twpol.txt.new

twadmin -m P -c tw.cfg -p tw.pol -S site.key -Q $SITEPASS twpol.txt.new > /dev/null

rm -f twpol.txt* *.bak

# データベース最新化

rm -f /usr/local/tripwire/lib/tripwire/*.twd*

tripwire -m i -s -c tw.cfg -P $LOCALPASS

⑨Tripwire 自動実行スクリプト実行設定

# chmod 700 tripwire.sh

cron に追加
# crontab -e
0 3 * * * /var/www/system/tripwire.sh

# chmod 700 tripwire.sh

cron に追加

# crontab -e

0 3 * * * /var/www/system/tripwire.sh

参考: メールで結果報告用スクリプト

#!/bin/bash

PATH=/usr/sbin:/usr/bin:/bin:/usr/local/tripwire/sbin

# パスフレーズ設定
LOCALPASS=xxxxx # ローカルキーパスフレーズ
SITEPASS=xxxxx # サイトキーパスフレーズ

#通知先メールアドレス指定
MAIL="<your mailaddress> "

cd /etc/tripwire

# Tripwireチェック実行
tripwire -m c -s -c tw.cfg|mail -s "Tripwire(R) Integrity Check Report in `hostname`" $MAIL

# ポリシーファイル最新化
twadmin -m p -c tw.cfg -p tw.pol -S site.key > twpol.txt
perl twpolmake.pl twpol.txt > twpol.txt.new
twadmin -m P -c tw.cfg -p tw.pol -S site.key -Q $SITEPASS twpol.txt.new > /dev/null
rm -f twpol.txt* *.bak

# データベース最新化
rm -f /usr/local/tripwire/lib/tripwire/*.twd*
tripwire -m i -s -c tw.cfg -P $LOCALPASS

#!/bin/bash

PATH=/usr/sbin:/usr/bin:/bin:/usr/local/tripwire/sbin

# パスフレーズ設定

LOCALPASS=xxxxx # ローカルキーパスフレーズ

SITEPASS=xxxxx # サイトキーパスフレーズ

#通知先メールアドレス指定

MAIL="<your mailaddress> "

cd /etc/tripwire

# Tripwireチェック実行

tripwire -m c -s -c tw.cfg|mail -s "Tripwire(R) Integrity Check Report in `hostname`" $MAIL

# ポリシーファイル最新化

twadmin -m p -c tw.cfg -p tw.pol -S site.key > twpol.txt

perl twpolmake.pl twpol.txt > twpol.txt.new

twadmin -m P -c tw.cfg -p tw.pol -S site.key -Q $SITEPASS twpol.txt.new > /dev/null

rm -f twpol.txt* *.bak

# データベース最新化

rm -f /usr/local/tripwire/lib/tripwire/*.twd*

tripwire -m i -s -c tw.cfg -P $LOCALPASS

下記コマンドを実行し、指定したメールアドレスにtripwire実行結果が通知されることを確認

# /var/www/system/tripwire.sh

1	# /var/www/system/tripwire.sh

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