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Re: hardening checkpoints



On Thu, Dec 15, 2005 at 10:02:46PM +0000, kevin bailey wrote:
> > 
> >> - i may need to access the server over ssh from anywhere.
> > 
> > bad idea... what you can do .. the cracker can also do from "anywhere"
> > 
> > at least, lock down incoming ssh from certain ip#
> > vi hosts.deny
> > ALL : ALL
> > 
> > vi hosts.allow
> > sshd:   your.own.machine.com
> > 
> 
> would like to do this - but i also need to be able to access the server from
> my laptop which connects over 3G - i.e. different IP address every time.
> 
> but your right - maybe i should set it up as you say most of the time and
> open up access for only the time i am away.

IF you need this you have several options:

- limit the firewall (or the tcp-wrappers config) to the IP address range of
  your ISP provider if you are being given a dynamic address over the 3G
  network. Granted, it's not a single IP, but it is far less than the full
  internet. 

- lock down the firewall to a list of valid IPs and use a port knocker (check
  knockd) to have a mechanism to open up the firewall if you need to from a
  given IP address at a given point in time.

Regards

Javier

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