About

These scripts can be used to enable a persistent reverse ssh connection from a host to a relay. The host box initiates a reverse ssh connection to the relay box, and a user can access the host through the relay.

Dependencies

must have openssh-server and autossh installed

Usage

download and edit the host_setup.sh file

only need to edit the four parameters at the top of the file

run host_setup.sh on the host machine

It will

1. add an ssh key pair in /etc/sshtunnel
2. create a script to run a systemd service in /etc/systemd/system/sshtunnel.service
3. start the sshtunnel service
4. Display the public key generated in step one. This should be copied and kept for the relay setup

run relay_setup.sh on the relay machine

It will

1. make a user named sshtunnel
2. create an empty authorized_keys file in /home/sshtunnel/.ssh/authorized_keys

Add the public key generated on the host to the relay

open the authorized keys file on the relay machine

relay-machine $ sudo nano /home/sshtunnel/.ssh/authorized_keys

paste in the public key you copied while setting up the host

Access the host machine from the relay machine

To access the host machine use the following ssh parameters

Hostname localhost
Port [reverse port you entered while editing host_setup.sh]