Fedora45 : Tripwire , Logwatch , DNS更新、ディスク使用率チェックスクリプト導入

# dnf -y install tripwire

# 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.

# vi /etc/tripwire/twcfg.txt

# 9 行目 : trueに変更
LOOSEDIRECTORYCHECKING =true
# 12 行目 : 最も詳細なレポートに変更
REPORTLEVEL =4

# 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

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

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

#!/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) ;

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

# 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

# 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

# echo test > /root/test.txt

# 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:            Thu 12 Nov 2026 03:25:32 PM JST
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        
  Operating System Utilities      100               0        0        0        
  Libraries                       66                0        0        0        
  OS executables and libraries    100               0        0        0        
  File System and Disk Administraton Programs
                                  100               0        0        0        
  Networking Programs             100               0        0        0        
  System Administration Programs  100               0        0        0        
  Critical Utility Sym-Links      100               0        0        0        
  Shell Binaries                  100               0        0        0        
* Tripwire Data Files             100               1        0        0        
  System boot changes             100               0        0        0        
  Security Control                100               0        0        0        
  Login Scripts                   100               0        0        0        
  Critical configuration files    100               0        0        0        
  Kernel Administration Programs  100               0        0        0        
  Hardware and Device Control Programs
                                  100               0        0        0        
  Application Information Programs
                                  100               0        0        0        
  (/sbin/rtmon)
  Critical system boot 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        

Total objects scanned:  53857
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.

# rm -f /root/test.txt

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

#!/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

# chmod 700 tripwire.sh

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

# /var/www/system/tripwire.sh

# dnf -y install logwatch

# cat /usr/share/logwatch/default.conf/logwatch.conf >> /etc/logwatch/conf/logwatch.conf

# vi /etc/logwatch/conf/logwatch.conf
# 76 行目 : 「MailTo = root」の行頭に「#」を挿入し、その下行に通知を受け取りたいメールアドレスを設定
#MailTo = root
MailTo = [メールアドレス]

# 115行目あたり : ログ通知の詳細度を設定
#Detail = Low
Detail = High

# logwatch --output stdout

 ################### Logwatch 7.15 (07/22/26) #################### 
        Processing Initiated: Thu Nov 12 15:37:53 2026
        Date Range Processed: yesterday
                              ( 2026-Nov-11 )
                              Period is day.
        Detail Level of Output: 10
        Type of Output/Format: stdout / text
        Logfiles for Host: Lepard
 ################################################################## 
 
 --------------------- Kernel Audit Begin ------------------------ 

  Number of audit daemon starts: 2 
 
  Number of audit daemon stops: 2 
 
  Number of audit initializations: 3 

----------------------------Omission-----------------------

 --------------------- Disk Space Begin ------------------------ 

 Filesystem               Size  Used Avail Use% Mounted on
 /dev/mapper/fedora-root   15G  3.8G   12G  26% /
 efivarfs                 256K   75K  177K  30% /sys/firmware/efi/efivars
 /dev/nvme0n1p2           2.0G  417M  1.6G  21% /boot
 /dev/nvme0n1p1           599M  8.0M  591M   2% /boot/efi
 
 
 ---------------------- Disk Space End ------------------------- 

 
 --------------------- lm_sensors output Begin ------------------------ 

 nvme-pci-0b00
 Adapter: PCI adapter
 Composite:    +29.9 C  
 
 
 ---------------------- lm_sensors output End ------------------------- 

 
 ###################### Logwatch End ######################### 

# /etc/cron.daily/0logwatch

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

#!/bin/bash

#通知先メールアドレス指定
MAIL="<Mail address>"

DVAL=`/bin/df / | /usr/bin/tail -1 | /bin/sed 's/^.* \([0-9]*\)%.*$/\1/'`

if [ $DVAL -gt 80 ]; then
echo "Disk usage alert: $DVAL %" | mail -s "Disk Space Alert in `hostname`" $MAIL
fi

# chmod 700 disk_capacity_check.sh

# df -h

Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/fedora-root   15G  3.8G   12G  26% /
devtmpfs                 1.9G     0  1.9G   0% /dev
tmpfs                    1.9G     0  1.9G   0% /dev/shm
efivarfs                 256K   75K  177K  30% /sys/firmware/efi/efivars
tmpfs                    771M  3.6M  768M   1% /run
none                     1.0M     0  1.0M   0% /run/credentials/systemd-journald.service
none                     1.0M     0  1.0M   0% /run/credentials/systemd-resolved.service
tmpfs                    1.9G  2.1M  1.9G   1% /tmp
/dev/nvme0n1p2           2.0G  417M  1.6G  21% /boot
/dev/nvme0n1p1           599M  8.0M  591M   2% /boot/efi
tmpfs                    386M  4.0K  386M   1% /run/user/1000

# dd if=/dev/zero of=dummyfile bs=1M count=10000

# /var/www/system/disk_capacity_check.sh

# rm dummyfile

# crontab -e
30 2 * * * /var/www/system/disk_capacity_check.sh

# cd /var/www/system
# vi ddnsset.py

#setddns.py
import requests
import ipaddress
from datetime import datetime
from pathlib import Path

# SETTING DATA
MY_DOMAIN = "example.jp" ←自ドメイン
MY_PASS = "xxxxxxxxxx" ←パスワード
MY_HOSTNAME = "xxxx" ←ホスト名
OUT_FILE = Path("/tmp/ipadress") ←IPアドレス記録ファイル

def time_msg():
    now = datetime.now()
    return now.strftime("%Y/%m/%d %H:%M:%S")

def is_valid_ip(ip_str):
    try:
        ipaddress.ip_address(ip_str)
        return True
    except ValueError:
        return False

def main():
    # Check Global IP Address
    url_get_ip = "https://dyn.value-domain.com/cgi-bin/dyn.fcg?ip"
    try:
        response = requests.get(url_get_ip, timeout=10)
        response.raise_for_status()
        current_ip = response.text.strip()
    except requests.RequestException as e:
        print(f"{time_msg()} Failed to get IP: {e}")
        return

    # IP check
    mssg = time_msg()
    if not current_ip:
        print(f"{mssg} invalid IP NULL")
        return

    if not is_valid_ip(current_ip):
        print(f"{mssg} invalid IP={current_ip}")
        return

    # Read previous IP
    previous_ip = ""
    if OUT_FILE.exists():
        with open(OUT_FILE, "r") as f:
            previous_ip = f.read().strip()

    if current_ip == previous_ip:
        print(f"{time_msg()} no change IP={current_ip}")
        return
    else:
        print(f"change IP from {previous_ip} to {current_ip}")

    # Update DDNS
    mssg = time_msg()
    print(f"{mssg} access to value-domain")

    url_set_ddns = (
        f"https://dyn.value-domain.com/cgi-bin/dyn.fcg?"
        f"d={MY_DOMAIN}&p={MY_PASS}&h={MY_HOSTNAME}"
    )

    try:
        response = requests.get(url_set_ddns, timeout=10)
        response.raise_for_status()
        # 改行をスペースに変換し、連続するスペースを1つにまとめる
        result = ' '.join(response.text.strip().split())
    except requests.RequestException as e:
        print(f"{time_msg()} Failed to update DDNS: {e}")
        return

    mssg = time_msg()
    print(f"{mssg} {MY_HOSTNAME}.{MY_DOMAIN} {result} IP={current_ip}")

    # DDNS更新が成功した場合のみIPを保存
    if "status=0" in result:
        with open(OUT_FILE, "w") as f:
            f.write(current_ip)
        print(f"{mssg} Successfully saved new IP: {current_ip}")
    else:
        print(f"{mssg} DDNS update failed, IP not saved")

if __name__ == "__main__":
    main()

# touch /tmp/ipadress

# crontab -e

* 00 * * * /usr/bin/python3 /var/www/system/ddnsset.py >> /var/log/ddns_updater.log 2>&1