Graphically manage SSH keys with Seahorse

Graphically manage SSH keys with Seahorse

Seahorse, also referred to as Passwords and Keys, allows you to manage SSH key generation and distribution even if you're not comfortable working on the command line.

Linux keys on the keyboard for a desktop computer
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If you're a Linux system administrator, you are probably familiar with using the Secure Shell (SSH) tool to securely connect to remote servers. You probably also know that SSH uses a public-private key pair to provide encryption. So, the first step in using SSH is to generate the key pair. You can also distribute your public key to remote servers so you can log into them without needing to type your password.

Seahorse, also referred to as Passwords and Keys, is a graphical tool for this purpose.

seahorse_main_empty.png

Seahorse Main Screen

Seahorse's main screen

Its maintainer, the GNOME desktop project, calls it "Seahorse, a GNOME encryption interface," but you'll find it in your applications list as "Passwords and Keys." It can manage many different key types and logins, but I will focus on SSH. Just as with the command line version, its configuration will be stored in the usual .ssh subdirectory in your home directory.

Generating your key

You can generate a new key from the interface shown below. The command line for this is ssh-keygen. From the Seahorse GUI, click the plus (+) and select Secure Shell Key and Continue.

seahorse_select_sshkey.png

Select SSH Key

Select SSH Key to generate a key

The next screen provides a field to enter a description. You can also choose whether to go ahead and distribute this key to another system you want to connect to in the future, but for this example, click Just Create Key.

seahorse_newkey.png

Creating a new SSH key

Creating a new SSH key

During the key-creation process, you'll be asked to enter a passphrase. I often leave this blank to avoid having to enter the passphrase each time I try to connect to another system; this interrupts the automation just like typing a password would. If you want to use my method, just click OK twice. Your new key is displayed in the interface.

seahorse_myfirstsshkey.png

My first SSH key

My first SSH key

You can also confirm the existence of your key pair by looking in your home directory's .ssh subdirectory.

alan@mainstation:~$ cd .ssh
alan@mainstation:~/.ssh$ ls -l
total 12
-rw------- 1 alan alan 1679 Apr  1 11:40 id_rsa
-rw-r--r-- 1 alan alan  398 Apr  1 11:40 id_rsa.pub
-rw-r--r-- 1 alan alan  222 Apr  1 10:54 known_hosts

There are two files that make up the SSH key pair. The file id_rsa is the private key. Notice that only you, the owner, will have read and write access to this file. It should not be shared with anyone. The file id_rsa.pub is the public key. It is safe to share since it is the file that is copied to a remote system when configuring key-based authentication. Let's look at that next.

Connect to a remote host

To use key-based authentication with a remote host, you need to copy your public key to that remote server. This is convenient because you don't need to type a password to log in. The command line for this is ssh-copy-id -i <identity file> <remote_host>. In the GUI, you can accomplish this by either clicking Remote from the menu bar or right-clicking on the SSH key. Select Configure Key for Secure Shell, and this window will appear:

seahorse_configureremote.png

Configuring a remote server

Configuring a remote server

Enter the hostname of the remote server and click Set Up. You'll be prompted for your remote server's login password, so enter it. There are no additional windows or prompts. You can now log into the remote server without needing to enter your password.

alan@mainstation:~$ ssh alan@workstation
Last login: Mon Apr  1 12:45:49 2019 from 192.168.2.6
alan@workstation:~$

Get more help

Most of the time, we use SSH and its utilities at the command line. Download the SSH Cheat Sheet for a complete usage guide.

Programming keyboard.

We round up handy SSH commands to help you connect to remote servers.

About the author

Alan
Alan Formy-Duval - Alan has 20 years of IT experience, mostly in the Government and Financial sectors. He started as a Value Added Reseller before moving into Systems Engineering. Alan's background is in high-availability clustered apps. He wrote the 'Users and Groups' and 'Apache and the Web Stack' chapters in the Oracle Press/McGraw Hill 'Oracle Solaris 11 System Administration' book. He earned his Master of Science in Information Systems from George Mason University. Alan is a long-time proponent of Open...