Table of Contents

インストール

  • epel リポジトリ 
    # yum install -y fail2ban

設定

  • /etc/fail2ban/fail2ban.local 

    [Definition]
loglevel = NOTICE

  • /etc/fail2ban/jail.local 

    [DEFAULT]
bantime  = 86400
findtime  = 86400
maxretry = 3

destemail = root
sender = fail2ban
mta = postfix

banaction = firewallcmd-ipset
banaction_allports = firewallcmd-multiport

[apache-auth]
enabled = true
port     = http,https
logpath  = %(apache_error_log)s

[apache-badbots]
# Ban hosts which agent identifies spammer robots crawling the web
# for email addresses. The mail outputs are buffered.
enabled = true
port     = http,https
logpath  = %(apache_access_log)s
bantime  = 172800
maxretry = 1

[apache-overflows]
enabled = true
port     = http,https
logpath  = %(apache_error_log)s
maxretry = 2

[apache-modsecurity]
enabled = true
port     = http,https
logpath  = %(apache_error_log)s
maxretry = 2

[apache-shellshock]
enabled = true
port    = http,https
logpath = %(apache_error_log)s
maxretry = 1

[postfix]
enabled = true
port     = smtp,465,submission
logpath  = %(postfix_log)s
backend  = %(postfix_backend)s

[postfix-rbl]
enabled = true
port     = smtp,465,submission
logpath  = %(postfix_log)s
backend  = %(postfix_backend)s
maxretry = 1

[postfix-sasl]
enabled = true
port     = smtp,465,submission,imap3,imaps,pop3,pop3s
# You might consider monitoring /var/log/mail.warn instead if you are
# running postfix since it would provide the same log lines at the
# "warn" level but overall at the smaller filesize.
logpath  = %(postfix_log)s
backend  = %(postfix_backend)s

サービス設定

# systemctl start fail2ban
# systemctl enable fail2ban
# systemctl status -l fail2ban

alias

  • /root/.bashrc 
    alias fail2ban-status-all="fail2ban-client status | sed -n 's/,//g;s/.*Jail list://p' | xargs -n1 fail2ban-client status"

ブロックしている IP アドレスの確認

# ipset --list

リンク

Linux