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. Rather than be forced to wait for a period of time to expire before the user session can be locked, RHEL 8 needs to provide users with the ability to manually invoke a session lock so users can secure their session if it is necessary to temporarily vacate the immediate physical vicinity.
Note: This requirement assumes the use of the RHEL 8 default graphical user interface, the GNOME desktop environment. If the system does not have any graphical user interface installed, this requirement is Not Applicable.
Verify RHEL 8 initiates a session lock after a 10-minute period of inactivity for graphical user interfaces with the following command:
$ sudo gsettings get org.gnome.desktop.session idle-delay uint32 600
If "idle-delay" is set to "0" or a value greater than "600", this is a finding.
Fix
Configure RHEL 8 to initiate a screensaver after a 10-minute period of inactivity for graphical user interfaces.
Create a database to contain the systemwide screensaver settings (if it does not already exist) with the following command:
$ sudo touch /etc/dconf/db/local.d/00-screensaver
Edit "/etc/dconf/db/local.d/00-screensaver" and add or update the following lines:
[org/gnome/desktop/session] # Set the lock time out to 600 seconds before the session is considered idle idle-delay=uint32 600