full-disclosure - Re: SSH brute force blocking tool

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Message-ID: <456C7288.6030205@kallisti.se>
Date: Tue, 28 Nov 2006 18:31:52 +0100
From: Anders B Jansson <hdw@...listi.se>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: SSH brute force blocking tool

Just one possibly silly question.

Why are you working so hard to do this with complex scripts and stuff?

I just wrote a little C snippet that runs on the firewall.
All servers allowing external ssh send a copy of ssh auth to a port
on the firewall.

If it detects a brute force it adds the host to the block list and
everything from that host is silently dropped.

Added a whitelist function to avoid DOS attempts.

Works perfect, and adds community service by letting the trawlers
hang until they timeout.
-- 
// hdw

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