The operating system must initiate a screensaver after a 15-minute period of inactivity for graphical user interfaces.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-71893	RHEL-07-010070	SV-86517r3_rule		Medium

Description
A session time-out 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 log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.

Description

A session time-out 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 log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.

STIG	Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide	2017-07-08

Details

Check Text ( C-72125r1_chk )
Verify the operating system initiates a screensaver after a 15-minute period of inactivity for graphical user interfaces. The screen program must be installed to lock sessions on the console. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Check to see if GNOME is configured to display a screensaver after a 15 minute delay with the following command: # grep -i idle-delay /etc/dconf/db/local.d/* idle-delay=uint32 900 If the "idle-delay" setting is missing or is not set to "900" or less, this is a finding.

Check Text ( C-72125r1_chk )

Verify the operating system initiates a screensaver after a 15-minute period of inactivity for graphical user interfaces. The screen program must be installed to lock sessions on the console.

Note: If the system does not have GNOME installed, this requirement is Not Applicable.

Check to see if GNOME is configured to display a screensaver after a 15 minute delay with the following command:

# grep -i idle-delay /etc/dconf/db/local.d/*
idle-delay=uint32 900

If the "idle-delay" setting is missing or is not set to "900" or less, this is a finding.

Fix Text (F-78245r4_fix)
Configure the operating system to initiate a screensaver after a 15-minute period of inactivity for graphical user interfaces. Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: # touch /etc/dconf/db/local.d/00-screensaver Edit "/org/gnome/desktop/session" and add or update the following lines: # Set the lock time out to 900 seconds before the session is considered idle idle-delay=uint32 900 You must include the "uint32" along with the integer key values as shown. Override the user's setting and prevent the user from changing it by editing "/etc/dconf/db/local.d/locks/screensaver" and adding or updating the following lines: # Lock desktop screensaver settings /org/gnome/desktop/session/idle-delay /org/gnome/desktop/screensaver/lock-enabled /org/gnome/desktop/screensaver/lock-delay Update the system databases: # dconf update Users must log out and back in again before the system-wide settings take effect.

Fix Text (F-78245r4_fix)

Configure the operating system to initiate a screensaver after a 15-minute period of inactivity for graphical user interfaces.

Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following command:

# touch /etc/dconf/db/local.d/00-screensaver

Edit "/org/gnome/desktop/session" and add or update the following lines:

# Set the lock time out to 900 seconds before the session is considered idle
idle-delay=uint32 900

You must include the "uint32" along with the integer key values as shown.

Override the user's setting and prevent the user from changing it by editing "/etc/dconf/db/local.d/locks/screensaver" and adding or updating the following lines:

# Lock desktop screensaver settings
/org/gnome/desktop/session/idle-delay
/org/gnome/desktop/screensaver/lock-enabled
/org/gnome/desktop/screensaver/lock-delay

Update the system databases:

# dconf update

Users must log out and back in again before the system-wide settings take effect.