From owner-freebsd-questions@FreeBSD.ORG  Wed Sep 20 05:45:47 2006
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References: <20060919165400.A4380@prime.gushi.org>
From: peter@bgnett.no (Peter N. M. Hansteen)
Date: Wed, 20 Sep 2006 07:45:43 +0200
In-Reply-To: <20060919165400.A4380@prime.gushi.org> (Dan Mahoney's message of
	"Tue, 19 Sep 2006 16:55:48 -0400 (EDT)")
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Subject: Re: sshd brute force attempts?
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"Dan Mahoney, System Admin" <danm@prime.gushi.org> writes:

> I've found a few things based on openBSD's pf, but that doesn't seem to be 
> the default in BSD either.

Recent BSDs (all of them, FreeBSD 5.n/6.n included) have PF in the base system.
'overload' rules are fairly easy to set up, eg 

table <bruteforce> persist

#Then somewhere fairly early in your rule set you set up to block from the bruteforcers

block quick from <bruteforce>

#And finally, your pass rule.

pass inet proto tcp from any to $localnet port $tcp_services \
        flags S/SA keep state \
	(max-src-conn 100, max-src-conn-rate 15/5, \
         overload <bruteforce> flush global)

for more detailed discussion see eg http://www.bgnett.no/~peter/pf/en/bruteforce.html

-- 
Peter N. M. Hansteen, member of the first RFC 1149 implementation team
http://www.blug.linux.no/rfc1149/ http://www.datadok.no/ http://www.nuug.no/
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