Tripwireインストール
[root@falcon21 ~]# yum -y install tripwire
インストール:
tripwire.x86_64 0:2.4.3.7-1.el7
完了しました!
tripwire初期設定
[root@falcon21 ~]# 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:
Verify the site keyfile passphrase:
Incorrect site passphrase.
Enter the site keyfile passphrase:
Verify the site keyfile passphrase:
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:
Verify the local keyfile passphrase:
Generating key (this may take several minutes)...Key generation complete.
----------------------------------------------
Signing configuration file...
Please enter your site passphrase:
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:
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設定
[root@falcon21 ~]# 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 =true
MAILNOVIOLATIONS =true
EMAILREPORTLEVEL =3
REPORTLEVEL =4
MAILMETHOD =SENDMAIL
SYSLOGREPORTING =false
MAILPROGRAM =/usr/sbin/sendmail -oi -t
Tripwire設定ファイル(暗号署名版)作成
[root@falcon21 ~]# twadmin -m F -c /etc/tripwire/tw.cfg -S /etc/tripwire/site.key /etc/tripwire/twcfg.txt
Please enter your site passphrase:
Wrote configuration file: /etc/tripwire/tw.cfg
※Tripwire設定ファイル(テキスト版)を復元する場合
[root@falcon21 ~]# twadmin -m f -c /etc/tripwire/tw.cfg > /etc/tripwire/twcfg.txt
ポリシーファイル最適化スクリプト作成
[root@falcon21 ~]# 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) ;
|
Tポリシーファイル最適化
[root@falcon21 ~]# perl /etc/tripwire/twpolmake.pl /etc/tripwire/twpol.txt > /etc/tripwire/twpol.txt.new
Tripwireデータベース自体をチェック対象外にする
[root@falcon21 ~]# echo ! "/var/lib/tripwire/`hostname`.twd ;" >> /etc/tripwire/twpol.txt.new
Tripwireログをチェック対象外にする※後述のTripwire定期自動実行スクリプトで使用
[root@falcon21 ~]# echo ! "/tmp/tripwire.log ;" >> /etc/tripwire/twpol.txt.new
ポリシーファイル(暗号署名版)作成
[root@falcon21 ~]# 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:
Wrote policy file: /etc/tripwire/tw.pol
ポリシーファイル(テキスト版)削除
[root@falcon21 ~]# rm -f /etc/tripwire/twpol.txt*
※ポリシーファイル(テキスト版)を復元する場合
[root@falcon21 ~]# twadmin -m p -c /etc/tripwire/tw.cfg -p /etc/tripwire/tw.pol -S /etc/tripwire/site.key > /etc/tripwire/twpol.txt
Tripwireデータベース作成
[root@falcon21 ~]# tripwire -m i -s -c /etc/tripwire/tw.cfg
Please enter your local passphrase:
Tripwire確認
[root@falcon21 ~]# tripwire -m c -s -c /etc/tripwire/tw.cfg
Open Source Tripwire(R) 2.4.3.7 Integrity Check Report
Report generated by: root
Report created on: 2019年02月15日 08時40分57秒
Database last updated on: Never
===============================================================================
Report Summary:
===============================================================================
Host name: falcon21.space
Host IP address: 203.181.3.94
Host ID: None
Policy file used: /etc/tripwire/tw.pol
Configuration file used: /etc/tripwire/tw.cfg
Database file used: /var/lib/tripwire/falcon21.space.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
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 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
Invariant Directories 66 0 0 0
Temporary directories 33 0 0 0
Critical devices 100 0 0 0
(/proc/kcore)
Total objects scanned: 36044
Total violations found: 0
===============================================================================
Object Summary:
===============================================================================
-------------------------------------------------------------------------------
# Section: Unix File System
-------------------------------------------------------------------------------
No violations.
===============================================================================
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.
*****************************************************
Tripwire定期自動実行設定
[root@falcon21 ~]# yum -y install tmpwatch
インストール:
tmpwatch.x86_64 0:2.11-5.el7
完了しました!
----------------------------------
Tripwire定期自動実行スクリプト作成
[root@falcon21 ~]# vi tripwire.sh
#!/bin/bash
# 既存のTripwire定期自動実行設定削除
rm -f /etc/cron.daily/tripwire-check
# パスフレーズ設定
LOCALPASS=xsw2 # ローカルパスフレーズ
SITEPASS=zaq1 # サイトパスフレーズ
TRIPWIRE=/usr/sbin/tripwire
TWADMIN=/usr/sbin/twadmin
TWPRINT=/usr/sbin/twprint
cd /etc/tripwire
# Tripwireチェック実行
# ※ファイル変更を検知した場合のみroot宛にサマリをメールする
rm -f /var/lib/tripwire/report/`hostname`-`date +%Y%m%d`-*.twr
${TRIPWIRE} -m c -s -c tw.cfg > /tmp/tripwire.log
if [ $(grep "Total violations found" /tmp/tripwire.log | awk '{print $4}') -ne 0 ]; then
${TWPRINT} -m r --report-level 1 -c tw.cfg -r /var/lib/tripwire/report/`hostname`-`date +%Y%m%d`-*.twr | \
mail -s "Tripwire Integrity Check Report from `hostname`" root
fi
# Tripwireチェック実行結果（過去分）削除
# ※過去90日分保管
tmpwatch -m 2160 /var/lib/tripwire/report
# 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 /var/lib/tripwire/*.twd*
${TRIPWIRE} -m i -s -c tw.cfg -P $LOCALPASS
~
------------------------------------------
[root@falcon21 ~]# chmod 700 tripwire.sh
[root@falcon21 ~]# echo "0 3 * * * root /root/tripwire.sh" > /etc/cron.d/tripwire
----------------------------
ポリシーファイルメンテナンス
ポリシーファイル(テキスト版)作成
[root@falcon21 ~]# twadmin -m p -c /etc/tripwire/tw.cfg -p /etc/tripwire/tw.pol -S /etc/tripwire/site.key > /etc/tripwire/twpol.txt
変更がわかっているディレクトリやファイルについては検知されないようにする
[root@falcon21 ~]# twadmin -m p -c /etc/tripwire/tw.cfg -p /etc/tripwire/tw.pol -S /etc/tripwire/site.key > /etc/tripwire/twpol.txt
チェック対象外にする
[root@falcon21 ~]# echo '!/var/log/sa ;' >> /etc/tripwire/twpol.txt
[root@falcon21 ~]# echo '!/etc/sysconfig/iptables ;' >> /etc/tripwire/twpol.txt
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
[root@falcon21 ~]# twadmin -m P -c /etc/tripwire/tw.cfg -p /etc/tripwire/tw.pol -S /etc/tripwire/site.key /etc/tripwire/twpol.txt
Please enter your site passphrase:
Wrote policy file: /etc/tripwire/tw.pol
ポリシーファイル(テキスト版&バックアップ)削除
[root@falcon21 ~]# rm -f /etc/tripwire/twpol.txt /etc/tripwire/tw.pol.bak
Tripwireデータベース更新
[root@falcon21 ~]# rm -f /var/lib/tripwire/*.twd* ; tripwire -m i -s -c /etc/tripwire/tw.cfg
Please enter your local passphrase: ・・・少し、時間がかかる。
**********************************************************************************