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Network Security Secure-Shell
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Re: shutting down dictionary attacks

from [apacheroot] Network Security [Permanent Link]
Subject: Re: shutting down dictionary attacks
Date: Wed, 06 Jul 2005 17:27:54 +0200 



On not to busy boxes one could also use an iptables rule with limit something 
like

iptables -A INPUT -p tcp -dport 22 -m limit --limit 3/second --limit-burst 5 -j 
ACCEPT
iptables -A INPUT -p tcp -dport 22 -j Log --log-prefix "to much SSh"

Accept normal incoming ssh packets. But when a storm of connections comes in 
like password brute force. It gets logged. (One could also drop the packets 
after log so they don´t traverse down the chain till policy hits.)
Josh Grosse <josh@jggimi.homeip.net> schrieb am 06.07.05 16:38:45:


On Tue, Jul 05, 2005 at 02:56:25AM -0000, LD wrote:

The only problem with setting the max to 1 is that if you're running an
SSH key agent, your SSH program may attempt key authentication.  Each key
in the ring counts as 1 authentication try, so this could possibly cut you
off if you use keys.  Just a warning ;)  Easily fixed.


Thanks for the warning.

I am running with key authentication (RSA), but not with forwarding agents --
only X11 is tunnelled.  So MaxAuthTries 1 works fine with OpenSSH or Putty
clients.



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