# ホスト型 IDS Tripwire とネットワーク型 IDS Snort の導入 with CentOS 6

## ホスト型 IDS Tripwire とネットワーク型 IDS Snort の導入 (CentOS 6)

### Tripwire

```
# rpm -ivh https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm
# yum install --enablerepo=epel tripwire
# tripwire-setup-keyfiles
```

/etc/tripwire/以下にサイトキーファイル(site.key)や平文のポリシーファイル(twpol.txt)が生成される。

ポリシーファイルの作成

```
# twadmin --create-polfile --site-keyfile /etc/tripwire/site.key /etc/tripwire/twpol.txt
```

データベースの初期化

```
# tripwire --init
```

整合性チェック

```
# tripwire --check
```

/var/lib/tripwire/report/以下にtwrファイルが生成される。

レポートの確認

```
# twprint --print-report --report-level 4 --twrfile /var/lib/tripwire/report/dc56dd103a9c-20180917-103119.twr
```

/etc/tripwire/twcfg.txt には平文のシステム設定ファイルがある。

```
ROOT                   =/usr/sbin
POLFILE                =/etc/tripwire/tw.pol
DBFILE                 =/var/lib/tripwire/$(HOSTNAME).twd
REPORTFILE             =/var/lib/tripwire/report/$(HOSTNAME)-$(DATE).twr
SITEKEYFILE            =/etc/tripwire/site.key
LOCALKEYFILE           =/etc/tripwire/$(HOSTNAME)-local.key
EDITOR                 =/bin/vi
LATEPROMPTING          =false
LOOSEDIRECTORYCHECKING =false
MAILNOVIOLATIONS       =true
EMAILREPORTLEVEL       =3
REPORTLEVEL            =3
MAILMETHOD             =SENDMAIL
SYSLOGREPORTING        =false
MAILPROGRAM            =/usr/sbin/sendmail -oi -t
```

### Snort

```
# yum install -y wget
# wget http://ftp.riken.jp/Linux/fedora/epel/RPM-GPG-KEY-EPEL-6
# rpm --import RPM-GPG-KEY-EPEL-6
# vi /etc/yum.repos.d/epel.repo
# yum install -y libnet-devel libdnet-devel --enablerepo=epel
# yum install -y  https://forensics.cert.org/centos/cert/6/x86_64/daq-2.0.6-2.el6.x86_64.rpm
# yum install -y https://forensics.cert.org/centos/cert/6/x86_64/snort-2.9.11.1-2.el6.x86_64.rpm
```

epel.repo

```
[epel]
name=EPEL RPM Repository for Red Hat Enterprise Linux
baseurl=http://ftp.riken.jp/Linux/fedora/epel/6/$basearch/
gpgcheck=1
enabled=0
```

設定ファイル作成

```
# vi /etc/snort/snort-sample.conf 
```

snort-sample.conf

```
alert tcp any any -> any 80 (msg:"web detection test"; content:"DETECTION-TEST";nocase; sid:1000000;)
```

起動

```
# snort -i eth0 -c /etc/snort/snort-sample.conf 
```

## 参考

* Tripwire\
  <https://www.tripwire.com/>
* Snort - Network Intrusion Detection - Prevention System\
  <https://www.snort.org/>


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