Ubuntu 22.04 LTS must use SSH to protect the confidentiality and integrity of transmitted information.

Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered.

This requirement applies to both internal and external networks and all types of information system components from which information can be transmitted (e.g., servers, mobile devices, notebook computers, printers, copiers, scanners, and facsimile machines). Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification.

Protecting the confidentiality and integrity of organizational information can be accomplished by physical means (e.g., employing physical distribution systems) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, then logical means (cryptography) do not have to be employed, and vice versa.

Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000425-GPOS-00189, SRG-OS-000426-GPOS-00190

Verify the "ssh.service" is enabled and active by using the following commands:

     $ sudo systemctl is-enabled ssh 
     enabled 

     $ sudo systemctl is-active ssh 
     active 

If "ssh.service" is not enabled and active, this is a finding.

Enable and start the "ssh.service" by using the following command:

     $ sudo systemctl enable ssh.service --now