Tar pitting automated attacks

[Jonathan Chen]

On Tue, Sep 07, 2004 at 09:42:16AM -0400, Mike Galvez wrote:
> I am seeing a lot of automated attacks lately against sshd such as:
> 
[...]
> Sep  6 12:16:39 www sshd[29901]: Failed password for illegal user server from 159.134.244.189 port 4044 ssh2
> Sep  6 12:16:41 www sshd[29902]: Failed password for illegal user adam from 159.134.244.189 port 4072 ssh2
> Sep  6 12:16:42 www sshd[29903]: Failed password for illegal user alan from 159.134.244.189 port 4104 ssh2
> Sep  6 12:16:43 www sshd[29904]: Failed password for illegal user frank from 159.134.244.189 port 4131 ssh2
> Sep  6 12:16:44 www sshd[29905]: Failed password for illegal user george from 159.134.244.189 port 4152 ssh2
> Sep  6 12:16:45 www sshd[29906]: Failed password for illegal user henry from 159.134.244.189 port 4175 ssh2
> -- snip --
> Some of these go on until they turn the logs over.
> 
> Is there a method to make this more expensive to the attacker, such as tar-pitting?

Put in a ipfw block on the netblock/country. At the very least it will
make it pretty slow for the initial TCP handshake.

Cheers.
-- 
Jonathan Chen <jonc at chen.org.nz>
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