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Date: Tue, 11 Apr 2006 21:12:22 -0700
From: Chris Maness <chris@chrismaness.com>
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To: Jonathan Franks <daemon@taconic.net>
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Cc: freebsd-questions@freebsd.org
Subject: Re: How to Stop Bruit Force ssh Attempts?
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Jonathan Franks wrote:

>
> On Mar 18, 2006, at 12:39 PM, Chris Maness wrote:
>
>> In my auth log I see alot of bruit force attempts to login via  ssh.  
>> Is there a way I can have the box automatically kill any tcp/ ip 
>> connectivity to hosts that try and fail a given number of  times?  Is 
>> there a port or something that I can install to give  this kind of 
>> protection.  I'm still kind of a FreeBSD newbie.
>
>
> If you are using PF, you can use source tracking to drop the  
> offenders in to a table... perhaps after a certain number of attempts  
> in a given time (say, 5 in a minute). Once you have the table you're  
> in business... you can block based on it... and then set up a cron  
> job to copy the table to disk every so often (perhaps once every two  
> minutes). It works very well for me, YMMV.
>
> If you don't want to block permanently, you could use cron to flush  
> the table every so often too... I don't bother though.
>
> -Jonathan

I use a port called DenyHost.  It adds an entry to hosts.allow that 
denies access.