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I'm trying to set up fail2ban for Roundcube 0.8.1 which is the latest version.

I've found several instructions for earlier versions of Roundcube like this one, but the log format used back then seems to be a lot different to mine.

This is what I have and what is happening:

in /etc/fail2ban/jail.conf

Code:

[roundcube]

enabled  = true

port     = http,https

filter   = roundcube

action   = iptables-multiport[name=roundcube, port="http,https"]

logpath  = /var/log/roundcubemail/errors

maxretry = 2

ignoreip =

in /etc/fail2ban/filter.d/roundcube.conf

Code:

[Definition]

failregex = IMAP Error: Login failed for .* from <HOST>

ignoreregex =

in /var/log/roundcubemail/errors I see

Code:

[30-Aug-2012 12:18:01 +0800]: IMAP Error: Login failed for john@somedomain.com from 1.2.3.4. AUTHENTICATE PLAIN: Authentication failed. in /var/www/html/shared/roundcubemail-0.8.1/program/include/rcube_imap.php on line 191 (POST /?_task=login&_action=login)

in /var/log/fail2ban.log I get

Code:

2012-08-30 12:18:02,466 fail2ban.filter : WARNING Unable to find a corresponding IP address for 1.2.3.4.

Now I guess the problem is the 'failregex' line of roundcube.conf, but regex isn't something I'm good at. Please can someone tell me what I need on that line?

Many thanks.

Peter