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billcouper81 · #1 17th March 2010, 16:26

I was searching on the net how I could use fail2ban for Roundcube webmail and I found many posts that had bits and pieces of information, but nothing complete... this works with the base installation of roundcube without any plugins

I have this setup with roundcube 0.3.1 and it works fine

Firstly, any IP that has 5 failed connection attempts within 10 minutes will get a 1 hour ban.... repeat offenders (2x 1hr bans within a 6hr period) will be banned for 24 hours...

adjust the roundcube log file path depending on your installation setup

add this to /etc/fail2ban/jail.conf:

Code:

[roundcube]
enabled  = true
port     = http,https
filter   = roundcube
logpath  = /usr/local/roundcube/logs/errors
maxretry = 5
findtime = 600
bantime = 3600

[roundcube-24hr]
enabled = true
port = http,https
filter = roundcube-24hr
logpath = /var/log/fail2ban.log
maxretry = 2
findtime = 21600
bantime = 86400

create new file /etc/fail2ban/filter.d/roundcube.conf

Code:

[Definition]
failregex = IMAP Error: Authentication for .* \(<HOST>\) failed \((?:LOGIN|AUTH)\):
ignoreregex =

create new file /etc/fail2ban/filter.d/roundcube-24hr.conf

Code:

[Definition]
failregex = \[roundcube\] Ban <HOST>
ignoreregex =

you can use the setup style of the 24hr rule above to have cascading bans that increase in length the more repeats are made.. not just for roundcube obviously, but for anything fail2ban is monitoring...

mastermind · #2 17th April 2010, 13:57

In my standard install of RoundCube 0.3.1, the remote client host is not logged to 'logs/errors'. It says (for example):

Code:

[17-Apr-2010 13:52:36 +0200]: IMAP Error: Authentication for <username> failed (LOGIN): "a001 NO Authentication failed." (POST /?_task=&_action=login)

Instead of trying to find a way to amend the log format, I have found it sufficient to use the roundcube-fail2ban plugin (by Matt Rude).