full-disclosure - SSH Bruteforce blocking script

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Message-ID: <A54C844ED592544A8AA8EF69AAB040180348A5@sbswin001>
Date: Mon Sep  5 04:51:05 2005
From: mike.benjamin at clarinet.com.au (Michael L Benjamin)
Subject: SSH Bruteforce blocking script

 
Thanks miah,

I wasn't aware of this functionality in iptables. It doesn't offer the
kind of permanency or logging that
I might want, but it's a good suggestion nonetheless for other
services/situations.

Mike.


-----Original Message-----
From: full-disclosure-bounces@...ts.grok.org.uk
[mailto:full-disclosure-bounces@...ts.grok.org.uk] On Behalf Of miah
Sent: Friday, September 02, 2005 11:56 PM
To: full-disclosure@...ts.grok.org.uk
Subject: Re: [Full-disclosure] SSH Bruteforce blocking script

If you're running iptables why not make use of hashlimit?  Once a limit
is reached all connection attempts from that IP would be blocked until
the hash entry expires.

An example pulled from the web:
iptables -A INPUT -m hashlimit -m tcp -p tcp --dport 22 --hashlimit \
1/min --hashlimit-mode srcip --hashlimit-name ssh -m state \ --state NEW
-j ACCEPT

https://www.redhat.com/archives/fedora-test-list/2005-August/msg00061.ht
ml
http://tinyurl.com/94fak

Also, don't forget to man iptables or iptables -m hashlimit -h 

-miah

On Fri, Sep 02, 2005 at 07:33:02PM +0800, Michael L Benjamin wrote:
> 
> 
> -----Original Message-----
> From: full-disclosure-bounces@...ts.grok.org.uk
> [mailto:full-disclosure-bounces@...ts.grok.org.uk] On Behalf Of Pedro 
> Hugo
> Sent: Friday, 2 September 2005 05:53 PM
> To: full-disclosure@...ts.grok.org.uk
> Subject: Re: [Full-disclosure] SSH Bruteforce blocking script
> 
> Hi,
> 
> >I don't want to debate the goodness or badness of the strategy of 
> >blocking hosts like this in /etc/hosts.deny. It works perfectly for 
> >me, and most likely would for you, so no religious debates thanks. 
> >It's effective at blocking bruteforce attacks. If a host EXCEEDS a 
> >specified number of guesses during the (configurable) 30 seconds it 
> >takes the script to cycle, the host is blacklisted.
> >
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