Ubuntu add proxy user for ssh proxy.

[wenzhixin]

Server side

• Add proxy user:

sudo useradd -m proxy

• Create an id_rsa key, will create id_rsa and id_rsa.pub files:

ssh-keygen

• Add authorized_keys:

sudo mkdir /home/proxy/.ssh
sudo cp id_rsa.pub /home/proxy/.ssh/authorized_keys
sudo chown -R proxy.proxy /home/proxy/.ssh

• Disable the login of proxy user:

sudo vi /etc/passwd

Add /bin/false to proxy line:

proxy:x:1002:1002::/home/proxy:/bin/false

Client side

• Add config:

host proxy 
    HostName server_ip
    User proxy
    IdentityFile ~/.ssh/proxy/id_rsa

• Test config:

ssh proxy

and it will return Connection to server_ip closed.