The operating system must enable a user session lock until that user re-establishes access using established identification and authentication procedures.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-71891	RHEL-07-010060	SV-86515r3_rule		Medium

Description
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-000030-GPOS-00011

Description

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-000030-GPOS-00011

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

Details

Check Text ( C-72123r1_chk )
Verify the operating system enables a user's session lock until that user re-establishes access using established identification and authentication procedures. 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 the screen lock is enabled with the following command: # grep -i lock-enabled /etc/dconf/db/local.d/00-screensaver lock-enabled=true If the "lock-enabled" setting is missing or is not set to "true", this is a finding.

Check Text ( C-72123r1_chk )

Verify the operating system enables a user's session lock until that user re-establishes access using established identification and authentication procedures. 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 the screen lock is enabled with the following command:

# grep -i lock-enabled /etc/dconf/db/local.d/00-screensaver
lock-enabled=true

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

Fix Text (F-78243r5_fix)
Configure the operating system to enable a user's session lock until that user re-establishes access using established identification and authentication procedures. 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/screensaver" and add or update the following lines: # Set this to true to lock the screen when the screensaver activates lock-enabled=true 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-78243r5_fix)

Configure the operating system to enable a user's session lock until that user re-establishes access using established identification and authentication procedures.

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/screensaver" and add or update the following lines:

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

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.