Fail2ban

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Fail2ban scans log files like /var/log/pwdfail or /var/log/apache/error_log and bans IP that makes too many password failures. It updates firewall rules to reject the IP address.

Installation

First, we need to install Gamin so that fail2ban can detect modification to the log files. See this page. Generally, you will just have to do :

#pacman -S gamin

Then you can install fail2ban

#pacman -S fail2ban

If you want fail2ban to send an email when someone has been banned, you have to configure SSMTP (for example). You will also have to install whois to get some information about the attacker.

#pacman -S whois

Now you can start fail2ban :

# /etc/rc.d/fail2ban start

You can add it into DAEMONS array in Template:Filename :

DAEMONS=(... fail2ban ...)


SSH jail

Edit Template:Filename and modify ssh-iptables section to enable it and configure the action.

If your firewall is iptables :

[ssh-iptables]
enabled  = true
filter   = sshd
action   = iptables[name=SSH, port=ssh, protocol=tcp]                                         
           sendmail-whois[name=SSH, dest=your@mail.org, sender=fail2ban@mail.com]
logpath  = /var/log/auth.log                                                                    
maxretry = 5

If your firewall is shorewall :

[ssh-iptables]
enabled  = true
filter   = sshd
action   = shorewall
           sendmail-whois[name=SSH, dest=your@mail.org, sender=fail2ban@mail.com]
logpath  = /var/log/auth.log                                                                    
maxretry = 5
Note: You can set BLACKLISTNEWONLY to No in Template:Filename otherwise the rule added to ban an IP address will affect only new connections.