This page describes how to use ssh (SSH client and OpenSSH daemon) on PureDarwin.
To install the SSH server, simply install OpenSSH.root.tar.gz (you can find a version compiled for Darwin 9 here).
To activate the SSH server (it will be automatically launched on every boot), issue
sudo launchctl load -w /System/Library/LaunchDaemons/ssh.plist
To stop the SSH server, issue
sudo launchctl unload -w /System/Library/LaunchDaemons/ssh.plist
To connect, do
ssh localhost -l toor
if you have a user "toor". Don't forget to change the password with the "passwd" command.