Ubuntu 22.04 LTS must initiate a graphical session lock after 10 minutes of inactivity.

A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence.

The session lock is implemented at the point where session activity can be determined.

Regardless of where the session lock is determined and implemented, once invoked, a session lock of Ubuntu 22.04 LTS must remain in place until the user reauthenticates. No other activity aside from reauthentication must unlock the system.

Note: If no graphical user interface is installed, this requirement is not applicable.

Verify Ubuntu 22.04 LTS has a graphical user interface session lock configured to activate after 10 minutes of inactivity by using the following commands:

Get the following settings to verify the graphical user interface session is configured to lock the graphical user session after 10 minutes of inactivity:

     $ gsettings get org.gnome.desktop.screensaver lock-enabled 
     true 

     $ gsettings get org.gnome.desktop.screensaver lock-delay 
     uint32 0 

     $ gsettings get org.gnome.desktop.session idle-delay 
     uint32 600 

If "lock-enabled" is not set to "true", is commented out, or is missing, this is a finding.

If "lock-delay" is set to a value greater than "0", or if "idle-delay" is set to a value greater than "600", is commented out, or is missing, this is a finding.

Configure Ubuntu 22.04 LTS to lock the current graphical user interface session after 10 minutes of inactivity.

Create or edit a file named "/etc/dconf/db/local.d/00-screensaver" with the following contents:

[org/gnome/desktop/screensaver] lock-enabled=true lock-delay=0

[org/gnome/desktop/session] idle-delay=600