[RCD] IP ban after multiple login failures

Ryan Horrisberger rhorrisb at ssc.wisc.edu
Fri Apr 16 15:49:14 CEST 2010


There is already a fail2ban plugin which does this.

mattrude.com/projects/roundcube-fail2ban-plugin/


On Apr 16, 2010, at 7:57 AM, Mike Ryan wrote:

> Hi,
> 
> I would like to get involved with RoundCube development and thought I would try to add this feature: http://trac.roundcube.net/ticket/1486636
> 
> Before I begin, I would like to check if this feature is actually desirable to the dev team?
> 
> My initial thought on how to implement this would be:
> 
> Add three new config settings - ban_ip_enabled, ban_ip_threshold, ban_ip_length
> Add a new SQL table (banned_ips) with three fields - "ip", "failed_login_count" and "expiry_time"
> Make two modifications to program/include/rcmail.php:
>     ~ line 613: after a failed login attempt failed_login_count is incremented for this IP, and the expiry_time is set to (now + ban_ip_length)
>     ~ line 551: before checking if the user/hostname is valid, check that 'SELECT count(banned_ip) FROM banned_ips where IP=$remote_ip and failed_login_count > $ban_ip_threshold and expiry_time > NOW()' returns 0
> 
> ban_ip_enabled would be checked before performing either of the checks above.
> 
> I would appreciate comments/suggestions on this approach. Also, I am not quite sure of the best way to clear out the expired entries from the banned_ips table. Is there some internal RC mechanism for performing tasks (in this case, issuing a SQL query to delete old entries) at specified intervals?
> 
> Cheers,
> 
> Mike
> 
> _______________________________________________
> List info: http://lists.roundcube.net/dev/

--
Ryan Horrisberger
Software Developer




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