I need it because I'm enabling FIPS and was following the documentation here for Ubuntu 18.04 - because I was hoping it might work on Ubuntu 20.04. Does it not exist yet? Should I downgrade to Ubuntu 18.04 ? If you have any question or suggestion, please leave comment below.Hi I'm trying to install openssh-client-hmac for Ubuntu 20.04. You can reduce the risk of automated attacks by changing the default SSH port. At the end, you also learned how to disable SSH password authentication.īy default, SSH listens on port 22. You can set up same key to multiple remote hosts. You learned how to create a new SSH keys pair and set up an SSH key-based authentication on Ubuntu 20.04 machine. You must need to restart the SSH service using below command: sudo systemctl restart sshĪt this point, password-based authentication is disabled on your Ubuntu server. Let’s login to your server using ssh: ssh edit the SSH configuration file located at /etc/ssh/sshd_config: sudo nano /etc/ssh/sshd_configįind PasswordAuthentication directive and if line commented out then uncomment the line and set the value to no as given below: PasswordAuthentication no Before starting process, make sure that you are able to authenticate to your server without entering password and must have sudo enabled user account. You can add one more security layer by disabling the password authentication for SSH. Step 4 – Disable SSH Password Authentication # After successful authentication, a new shell session will open your user account on the Ubuntu server. Otherwise it will be asked to enter passphrase. Now, if you haven’t set passphrase for your keys then you will be logged in immediately without asking passphrase. Type yes and hit Enter key to continue: Output Try to connect using SSH command: ssh you are first time to login then it may prompt you as following. Now, you should be able to login to the remote machine without the remote user’s password. Step 3 – Login to the Server using SSH Keys # If your local system don’t have ssh-copy-id utility installed then you can use following command to copy the public key: cat ~/.ssh/id_rsa.pub | ssh "mkdir -p ~/.ssh & cat > ~/.ssh/authorized_keys"Įnsure that you have password-based SSH access to your server then only you can use above method. Now you can try login to your machine with command ssh and check that only the key(s) added which you want to add. Once the user is authenticate successfully, the public key will be appended to ~/.ssh/authorized_keys file on remote user and connection will be disconnected. Run the below command: ssh-copy-id will be prompted to enter password for your username: password: Simple and fast way to copy public is to use ssh-copy-id utility. Next step is to place public key to your Ubuntu server. It will show output like this: /home/yourusername/.ssh/id_rsa /home/yourusername/.ssh/id_rsa.pub Step 2 – Copy Public Key to Server #
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