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Date: Tue, 11 Apr 2006 23:33:13 -0400
From: Adam Stroud <adam@thegeeklord.com>
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To: Jonathan Franks <daemon@taconic.net>
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Cc: Chris Maness <chris@chrismaness.com>, freebsd-questions@freebsd.org
Subject: Re: How to Stop Bruit Force ssh Attempts?
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I second that.  I have been doing the same thing (except running an 
OpenBSD firewall that blocks the offenders via pf) and it works like a 
charm.

A

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
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