1. Install fail2ban
#yum -y install fail2ban
2. Buat sistem startup link untuk fail2ban dan jalankan
Code:
#chkconfig –levels 235 fail2ban on
# /etc/init.d/fail2ban start
3. Coba login ke ssh, dan masukan 3 password yg salah. Nanti IP kamu akan di blokir selama 10 menit.
4. Untuk liat log nya
Code:
# tail -f /var/log/fail2ban.log
contoh isi log
Code:
2011-06-28 22:27:58,953 fail2ban.jail : INFO Jail ‘ssh’ started
2011-06-28 22:29:36,430 fail2ban.actions: WARNING [ssh] Ban 192.168.1.18
5. Konfigurasi fail2ban
Code:
vi /etc/fail2ban/jail.conf
————————————————————
# Fail2Ban configuration file
#
# Author: Cyril Jaquier
#
# $Revision: 617 $
#
# The DEFAULT allows a global definition of the options. They can be override
# in each jail afterwards.
[DEFAULT]
# "ignoreip" can be an IP address, a CIDR mask or a DNS host. Fail2ban will not
# ban a host which matches an address in this list. Several addresses can be
# defined using space separator.
ignoreip = 127.0.0.1 192.168.0.99
# "bantime" is the number of seconds that a host is banned.
bantime = 600
# A host is banned if it has generated "maxretry" during the last "findtime"
# seconds.
findtime = 600
# "maxretry" is the number of failures before a host get banned.
maxretry = 3
# "backend" specifies the backend used to get files modification. Available
# options are "gamin", "polling" and "auto". This option can be overridden in
# each jail too (use "gamin" for a jail and "polling" for another).
#
# gamin: requires Gamin (a file alteration monitor) to be installed. If Gamin
# is not installed, Fail2ban will use polling.
# polling: uses a polling algorithm which does not require external libraries.
# auto: will choose Gamin if available and polling otherwise.
backend = auto
[ssh-iptables]
enabled = true
filter = sshd
action = iptables[name=SSH, port=ssh, protocol=tcp]
sendmail-whois[name=SSH, dest=you@mail.com, sender=fail2ban@mail.com]
logpath = /var/log/secure
maxretry = 5
[proftpd-iptables]
enabled = true
filter = proftpd
action = iptables[name=ProFTPD, port=ftp, protocol=tcp]
sendmail-whois[name=ProFTPD, dest=you@mail.com]
logpath = /var/log/secure
maxretry = 6
[sasl-iptables]
enabled = true
filter = sasl
backend = polling
action = iptables[name=sasl, port=smtp, protocol=tcp]
sendmail-whois[name=sasl, dest=you@mail.com]
logpath = /var/log/maillog
[apache-tcpwrapper]
enabled = true
filter = apache-auth
action = hostsdeny
logpath = /var/log/httpd/*error_log
maxretry = 6
[postfix-tcpwrapper]
enabled = true
filter = postfix
action = hostsdeny
sendmail[name=Postfix, dest=you@mail.com]
logpath = /var/log/maillog
bantime = 300
[courierpop3]
enabled = true
port = pop3
filter = courierlogin
action = iptables[name=%(__name__)s, port=%(port)s]
logpath = /var/log/maillog
maxretry = 5
[courierimap]
enabled = true
port = imap2
filter = courierlogin
action = iptables[name=%(__name__)s, port=%(port)s]
logpath = /var/log/maillog
maxretry = 5
[ssh-tcpwrapper]
enabled = false
filter = sshd
action = hostsdeny
sendmail-whois[name=SSH, dest=you@mail.com]
ignoreregex = for myuser from
logpath = /var/log/secure
[vsftpd-notification]
enabled = false
filter = vsftpd
action = sendmail-whois[name=VSFTPD, dest=you@mail.com]
logpath = /var/log/secure
maxretry = 5
bantime = 1800
[vsftpd-iptables]
enabled = false
filter = vsftpd
action = iptables[name=VSFTPD, port=ftp, protocol=tcp]
sendmail-whois[name=VSFTPD, dest=you@mail.com]
logpath = /var/log/secure
maxretry = 5
bantime = 1800
[apache-badbots]
enabled = false
filter = apache-badbots
action = iptables-multiport[name=BadBots, port="http,https"]
sendmail-buffered[name=BadBots, lines=5, dest=you@mail.com]
logpath = /var/log/httpd/*access_log
bantime = 172800
maxretry = 1
[apache-shorewall]
enabled = false
filter = apache-noscript
action = shorewall
sendmail[name=Apache, dest=you@mail.com]
logpath = /var/log/httpd/error_log
[ssh-ipfw]
enabled = false
filter = sshd
action = ipfw[localhost=192.168.0.1]
sendmail-whois[name="SSH,IPFW", dest=you@mail.com]
logpath = /var/log/secure
ignoreip = 168.192.0.1
[named-refused-udp]
enabled = false
filter = named-refused
action = iptables-multiport[name=Named, port="domain,953", protocol=udp]
sendmail-whois[name=Named, dest=you@mail.com]
logpath = /var/log/secure
ignoreip = 168.192.0.1
[named-refused-tcp]
enabled = false
filter = named-refused
action = iptables-multiport[name=Named, port="domain,953", protocol=tcp]
sendmail-whois[name=Named, dest=you@mail.com]
logpath = /var/log/secure
ignoreip = 168.192.0.1
------------------------------------------------------------
Jangan lupa mengganti you@mail.com dengan email kamu.
Setelah konfigurasi lakukan restart
Code:
# /etc/init.d/fail2ban restart
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