Re: Restricting ssh

[Donald Russell <russell.don@xxxxxxxxx>]

On Thu, Jan 6, 2011 at 15:45, Sam Varshavchik <mrsam@xxxxxxxxxxxxxxx> wrote:

Timothy Murphy writes:

I have an sshd server running on a machine in Ireland.

Can I configure it so that it only accepts connection
from certain machines, wherever they may be in the world?

In sshd_config set:

PasswordAuthentication no

Then, on the machines that you wish to allow connections from, in each account you wish to connect, run ssh-keygen to generate a keypair. This will create id_rsa and id_rsa.pub (or id_dsa and id_dsa.pub) in $HOME/.ssh (with permissions set appropriately), then append the contents of id_rsa.pub or id_dsa.pub to the $HOME/.ssh/authorized_keys2 file on the server that you want to connect TO.

There are ssh commands that make that process even easier...
Once you have your public/private key pair...

eval $(ssh-agent)
ssh-add
ssh-copy-id <remote system>

You'll be prompted for the password at the remote system so it can copy the keys across, if that's successful, you won't need the password anymore.

I added these to my ~/.bash_profile
eval $(ssh-agent)
ssh-add

I get prompted once for my ssh key passphrase and after that I don't get prompted for password anymore for the systems I ssh to.
(You can also not use an ssh key passphrase but I'm not quite that paranoia-free. :-)

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