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ssh?



I'm trying to make my system a little more secure but still allow it to be
accessed remotely from the internet using ssh and I'm looking for some
guidance.  The systems in question are a Fedora 9 and a Fedora Core 6 system.

The first thing I did was on my workstation (that I ssh from) is create a
public/private key pair and installed the public key in 
~/.ssh/authorized_keys2, and disabled the password authentication in the  
/etc/ssh/sshd_config and everything so far works great.

My issue I came up with is one of the systems sits on my home network behind
a firewall, it would be nice if I can only require the public key for
systems not on my local network, eg only the systems on the internet must
be known.  I guess telnet is an option since it is blocked at the firewall.

Next question/problem is, if I create an account for somebody to use when
connecting to the system, I must put their public key in their home
directory, can it be done the reverse?  In other words can I provide them
a key for the system and if they don't have that key they can not connect
to the system.

Thanks, Jeff


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