Re: targetted SSH bruteforce attacks

[Gary Baribault <gary () baribault net>]

In this attack, there's no need to throttle, the attacking computers hit
it once every 15 seconds or so from many different sources. My denyhosts
is not blocking 99.999% of the attempts.

Gary Baribault
Courriel: gary () baribault net
GPG Key: 0x685430d1
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On 06/23/2010 12:33 PM, Cody Robertson wrote:
> On 6/23/10 4:22 AM, yersinia wrote:
>   
> > On Thu, Jun 17, 2010 at 4:21 PM, Samuel Martín Moro <faust64 () gmail com>wrote:
> >
> >     
> > > I also don't want to change my ssh port, nor restrict incoming IPs, ... and
> > > I use keys only to log in without entering password.
> > > So you're not alone.
> > > I had my IP changed several times, my servers are only hosting personal
> > > data.
> > > But I'm still seeing bruteforce attemps in my logs.
> > >
> > > Here's something I use on my servers.
> > > In cron, every 5-10 minutes, that should do it.
> > > Of course, if you're running *BSD, pf is way more interesting to do that.
> > >
> > > Perhaps could be better to use something standard as fail2ban
> > >       
> > http://www.ducea.com/2006/07/03/using-fail2ban-to-block-brute-force-attacks/?
> >
> >
> >
> >
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> If you have iptables it has ways you can do this throttle too many
> connections within a specified period. I much prefer using something
> such as this over third party software.
>
> I'm sure you can do this in PF however I'm not familiar with it enough
> to be certain (I'd be surprised if you couldn't however).
>
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>   

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