git clone https://gist.github.com/e6fc929c1e7e47744ade.git autosshd
cd autosshd
sudo ./install
sudo vim /etc/autosshd/ssh_config
sudo ssh -F /etc/autosshd/ssh_config tunnel
sudo service autosshd start
And then install /etc/autosshd/id_rsa.pub
at target.