[nycbug-talk] Fwd: Stopping SSH dictionary attacks?
Tue Dec 21 16:02:11 EST 2004
On Dec 21, 2004, at 3:15 PM, G. Rosamond wrote:
> Begin forwarded message:
>> From: "Juan J. Martinez" <reidrac at usebox.net>
>> Date: December 21, 2004 1:14:29 PM EST
>> To: misc at openbsd.org
>> Subject: Re: Stopping SSH dictionary attacks?
>>> One solution I'm considering is writing a script that parses authlog
>>> every hour or so and adds any IPs with more than x failed login
>>> attempts to ipcop/etc/hosts_deny, am I on the right track with this
>>> (has someone already done it - I'm a big fan of not re-inventing the
>> Actually I've done this... however I think its usefulness is limited
>> (ie. scans from the same IP in different days are rare), but was fun
>> to code.
>> You can check it at (the package is ssh_blocker):
> This may be relevant to some earlier discussions about openssh
> security and brute force/dictionary attacks.
It's probably more secure to just turn off PasswordAuthentication.
Then you don't have to worry about dictionary attacks, and brute force
wouldn't be feasible.
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