Tripwire : ホスト型IDS2015/06/21 |
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ホスト型 IDS (Intrusion Detection System - 侵入検知システム) の Tripwire のインストールと設定です。
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| [1] | Tripwire をインストールします。 |
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# EPEL からインストール [root@dlp ~]# yum --enablerepo=epel -y install tripwire
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| [2] | キーの作成やデータベース作成等の初期設定をします。 |
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# キーを生成 [root@dlp ~]# tripwire-setup-keyfiles ..... Enter the site keyfile passphrase: # サイトキーファイルのパスフレーズ設定 Verify the site keyfile passphrase: # 確認再入力 ..... ..... Enter the local keyfile passphrase: # ローカルキーファイルのパスフレーズ設定 Verify the local keyfile passphrase: # 確認再入力 ..... ..... Please enter your site passphrase: # サイトキーファイルのパスフレーズで応答 ..... .....
Please enter your site passphrase:
[root@dlp ~]# # サイトキーファイルのパスフレーズで応答 ..... ..... cd /etc/tripwire
[root@dlp tripwire]#
vi twcfg.txt # 12行目：報告レベル最大に変更 REPORTLEVEL = 4
# 設定ファイル生成 [root@dlp tripwire]# twadmin -m F -c tw.cfg -S site.key twcfg.txt
Please enter your site passphrase:
# サイトキーパスフレーズで応答 Wrote configuration file: /etc/tripwire/tw.cfg # デフォルトでは、存在しないファイル/ディレクトリを多数チェックにいくため、 # 以下のポリシー最適化スクリプトを利用させていただき、ポリシーを最適化する [root@dlp tripwire]# vi twpolmake.pl
#!/usr/bin/perl
# Tripwire Policy File customize tool
# ----------------------------------------------------------------
# Copyright (C) 2003 Hiroaki Izumi
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# 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.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# ----------------------------------------------------------------
# Usage:
# perl twpolmake.pl {Pol file}
# ----------------------------------------------------------------
#
$POLFILE=$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) ;
[root@dlp tripwire]#
perl twpolmake.pl twpol.txt > twpol.txt.new [root@dlp tripwire]# twadmin -m P -c tw.cfg -p tw.pol -S site.key twpol.txt.new Please enter your site passphrase: Wrote policy file: /etc/tripwire/tw.pol # データベース作成 [root@dlp tripwire]# tripwire -m i -s -c tw.cfg Please enter your local passphrase: |
| [3] | チェックを実行します。 なお、定期チェックのスクリプトはパッケージに含まれており日次でチェック実行されます。 |
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[root@dlp ~]# tripwire -m c -s -c /etc/tripwire/tw.cfg
Open Source Tripwire(R) 2.4.2.2 Integrity Check Report
Report generated by: root
Report created on: Fri 18 Jun 2015 19:53:39 PM JST
Database last updated on: Never
===============================================================================
Report Summary:
===============================================================================
Host name: dlp.srv.world
Host IP address: 10.0.0.30
Host ID: None
Policy file used: /etc/tripwire/tw.pol
Configuration file used: /etc/tripwire/tw.cfg
Database file used: /var/lib/tripwire/dlp.srv.world.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
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
Application Information Programs
100 0 0 0
(/sbin/rtmon)
Operating System Utilities 100 0 0 0
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
Critical configuration files 100 0 0 0
Security Control 100 0 0 0
Login Scripts 100 0 0 0
Root config files 100 0 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: 21739
Total violations found: 1
===============================================================================
Object Summary:
===============================================================================
-------------------------------------------------------------------------------
# Section: Unix File System
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
Rule Name: Tripwire Data Files (/var/lib/tripwire)
Severity Level: 100
-------------------------------------------------------------------------------
Added:
"/var/lib/tripwire/dlp.srv.world.twd"
===============================================================================
Error Report:
===============================================================================
No Errors
-------------------------------------------------------------------------------
*** End of report ***
Open Source Tripwire 2.4 Portions copyright 2000 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.
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| [4] | チェックの結果、変更が検出されたが内容に問題ない場合にデータベースの更新を行う場合は以下のようにします。 |
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# チェック結果は以下の場所へ保管されている [root@dlp ~]# ll /var/lib/tripwire/report total 8 -rw-r--r-- 1 root root 6814 Jun 17 19:53 dlp.srv.world-20150617-125339.twr # 問題無しのレポートを指定してデータベースを更新 [root@dlp ~]# tripwire -m u -a -s -c /etc/tripwire/tw.cfg \ -r /var/lib/tripwire/report/dlp.srv.world-20150617-125339.twr Please enter your local passphrase: |
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