TOSS 5 must enable a user session lock until that user reestablishes access using established identification and authentication procedures for graphical user sessions.

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, the session lock must remain in place until the user reauthenticates. No other activity aside from reauthentication must unlock the system.

Satisfies: SRG-OS-000028-GPOS-00009, SRG-OS-000029-GPOS-00010

Verify TOSS 5 enables a user's session lock until that user reestablishes access using established identification and authentication procedures using the following command:

Note: This requirement assumes the use of the TOSS 5 default graphical user interface—the GNOME desktop environment. If the system does not have a graphical user interface installed, this requirement is not applicable.

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

true

If the setting is "false", this is a finding.

Configure TOSS 5 to enable a user's session lock until that user reestablishes access using established identification and authentication procedures.

Create a database to contain the systemwide screensaver settings (if it does not already exist) with the following example:

$ sudo vi /etc/dconf/db/local.d/00-screensaver

Edit the "[org/gnome/desktop/screensaver]" section of the database file and add or update the following lines:

# Set this to true to lock the screen when the screensaver activates lock-enabled=true

Update the system databases:

$ sudo dconf update