TripwireをYumでインストールする場合、EPELリポジトリを追加しておく。
古いTripwireが残ってる場合はアンインストールしておく
[root@server1 ~]# yum remove tripwire 下記コマンドで検索して出てきたものは全て削除しておく（ディレクトリー「rm -rf」、ファイル「rm -f」） [root@server1 ~]# find /* | grep tripwire
■Tripwireのインストール
[root@server ~]# yum install tripwire Loaded plugins: fastestmirror, refresh-packagekit Loading mirror speeds from cached hostfile epel/metalink | 2.9 kB 00:00 * base: www.ftp.ne.jp * centosplus: www.ftp.ne.jp * epel: ftp.riken.jp * extras: www.ftp.ne.jp * updates: www.ftp.ne.jp base | 3.7 kB 00:00 centosplus | 3.5 kB 00:00 epel | 4.3 kB 00:00 epel/primary_db | 4.2 MB 00:03 extras | 3.5 kB 00:00 updates | 3.5 kB 00:00 updates/primary_db | 4.3 MB 00:01 Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package tripwire.i686 0:2.4.1.2-11.el6 will be installed --> Finished Dependency Resolution Dependencies Resolved ==================================================================================================== Package Arch Version Repository Size ==================================================================================================== Installing: tripwire i686 2.4.1.2-11.el6 epel 1.2 M Transaction Summary ==================================================================================================== Install 1 Package(s) Total download size: 1.2 M Installed size: 3.7 M Is this ok [y/N]: y Downloading Packages: tripwire-2.4.1.2-11.el6.i686.rpm | 1.2 MB 00:01 Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : tripwire-2.4.1.2-11.el6.i686 1/1 Verifying : tripwire-2.4.1.2-11.el6.i686 1/1 Installed: tripwire.i686 0:2.4.1.2-11.el6 Complete!
■tripwireの初期設定
[root@server ~]# 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: ← サイトパスフレーズを設定 Verify the site keyfile passphrase: ← サイトパスフレーズを再度入力 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: ← ローカルパスフレーズを設定 Verify the local keyfile passphrase: ← ローカルパスフレーズを再度入力 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の設定
[root@server ~]# vi /etc/tripwire/twcfg.txt 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 ↓ LOOSEDIRECTORYCHECKING =true MAILNOVIOLATIONS =true EMAILREPORTLEVEL =3 REPORTLEVEL =3 ↓ REPORTLEVEL =4 MAILMETHOD =SENDMAIL SYSLOGREPORTING =false MAILPROGRAM =/usr/sbin/sendmail -oi -t 設定ファイル(テキスト版⇒暗号署名版)を作成 [root@server ~]# 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 セキュリティ確保のため設定ファイル(テキスト版)を削除 [root@server ~]# rm -f /etc/tripwire/twcfg.txt 設定ファイル(テキスト版)を復活させる場合は以下のコマンドで復活できる [root@server~]# twadmin --print-cfgfile > /etc/tripwire/twcfg.txt
■ポリシーファイルの設定
ポリシーファイルの最適化スクリプトを作成
[root@server ~]# vi /etc/tripwire/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) ;
ポリシーファイルの最適化 [root@server ~]# perl /etc/tripwire/twpolmake.pl /etc/tripwire/twpol.txt > /etc/tripwire/twpol.txt.new ポリシーファイル(暗号署名版)を作成 [root@server ~]# 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 ポリシーファイル(テキスト版)を削除 [root@server ~]# rm -f /etc/tripwire/twpol.txt* ポリシーファイル(テキスト版)を復活させる場合は以下のコマンドで復活できる [root@server ~]# twadmin -m p -c /etc/tripwire/tw.cfg -p /etc/tripwire/tw.pol -S /etc/tripwire/site.key > /etc/tripwire/twpol.txt
■Tripwireのデータベース作成
ポリシーファイルよりデータベースを作成 [root@server ~]# 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
■Tripwireの確認
ファイル変更をチェック [root@server ~]# tripwire -m c -s -c /etc/tripwire/tw.cfg Open Source Tripwire(R) 2.4.1 Integrity Check Report Report generated by: root Report created on: 2013年01月17日 17時11分21秒 Database last updated on: Never =============================================================================== Report Summary: =============================================================================== Host name: server.pine-f.co.jp Host IP address: 127.0.0.1 Host ID: None Policy file used: /etc/tripwire/tw.pol Configuration file used: /etc/tripwire/tw.cfg Database file used: /var/lib/tripwire/server.pine-f.co.jp.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 --------- -------------- ----- ------- -------- Invariant Directories 66 0 0 0 Temporary directories 33 0 0 0 * Tripwire Data Files 100 1 0 0 Critical devices 100 0 0 0 (/proc/kcore) User binaries 66 0 0 0 Tripwire Binaries 100 0 0 0 Libraries 66 0 0 0 Operating System Utilities 100 0 0 0 Critical system boot files 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 Application Information Programs 100 0 0 0 (/sbin/rtmon) Shell Related Programs 100 0 0 0 (/sbin/getkey) Critical Utility Sym-Links 100 0 0 0 Shell Binaries 100 0 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 Total objects scanned: 27453 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/server.pine-f.co.jp.twd" ← 今回追加されたTripwireのデータベースなので問題無し =============================================================================== 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.
■Tripwireの定期自動実行設定
インストール時に作成されてたTripwireの定期実行ファイルを編集
[root@server1 ~]# vi /etc/cron.daily/tripwire-check
#!/bin/sh
# デフォルトの部分をコメントアウト
#HOST_NAME=`uname -n`
#if [ ! -e /var/lib/tripwire/${HOST_NAME}.twd ] ; then
# echo "**** Error: Tripwire database for ${HOST_NAME} not found. ****"
# echo "**** Run "/etc/tripwire/twinstall.sh" and/or "tripwire --init". ****"
#else
# test -f /etc/tripwire/tw.cfg && /usr/sbin/tripwire --check
#fi
# パスフレーズ設定
LOCALPASS=xxxxxxxx # ローカルパスフレーズ
SITEPASS=xxxxxxxx # 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
# データベース更新
rm -f /usr/local/tripwire/lib/tripwire/*.twd*
tripwire -m i -s -c tw.cfg -P $LOCALPASS
パーミッション変更 [root@server1 ~]# chmod 700 /etc/cron.daily/tripwire-check
これで、/etc/cron.daily/tripwire-check が一日一回実行され、メールが届くようになる。