How do I let only specific PCs connect to via SSH?

I have an Ubuntu Server and I want only a few PCs to be able to connect to my server via SSH (on port 22). Is there a way that I can create an certificate that I would install on the few PCs that are allowed on the server?

1 Answer

You can use ssh key-based authentication.

1. Generate private and public ssh key on one of PC using,

   ssh-keygen

2. Configure your ubuntu server's /etc/ssh/sshd_config file

   PubkeyAuthentication yesPasswordAuthentication no

3. restart sshd service on ubuntu server

   systemctl restart sshd.service

4. Add genetated public key into ubuntu servers /home/users-home/.ssh/authorized_keys

5. Place generated private key in /home/users-home/.ssh/ path on each PC.