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Enable GNOME3 Screensaver Idle Activation To activate the screensaver in the GNOME3 desktop after a period of inactivity, the 'idle-activation-enabled' setting must be set under an appropriate configuration file(s) in the '/etc/dconf/db/local.d' directory and locked in '/etc/dconf/db/local.d/locks' directory to prevent user modification. After the settings have been set, run 'dconf update'.

Enable GNOME3 Screensaver Lock After Idle Period To activate locking of the screensaver in the GNOME3 desktop when it is activated, the 'lock-enabled' and 'lock-delay' setting must be set under an appropriate configuration file(s) in the '/etc/dconf/db/local.d' directory and locked in '/etc/dconf/db/local.d/locks' directory to prevent user modification. After the settings have been set, run 'd ...

Implement Blank Screensaver To set the screensaver mode in the GNOME3 desktop to a blank screen, the 'picture-uri' setting must be set under an appropriate configuration file(s) in the '/etc/dconf/db/local.d' directory and locked in '/etc/dconf/db/local.d/locks' directory to prevent user modification. After the settings have been set, run 'dconf update'.

Enable Smart Card Login To enable smart card authentication, consult the documentation at:

Disable the GNOME3 Login User List In the default graphical environment, users logging directly into the system are greeted with a login screen that displays all known users. This functionality should be disabled. The 'disable-user-list' setting must be set under an appropriate configuration file(s) in the '/etc/dconf/db/gdm.d' directory and locked in '/etc/dconf/db/gdm.d/locks' directory to ...

Disable Zeroconf Networking Zeroconf networking allows the system to assign itself an IP address and engage in IP communication without a statically-assigned address or even a DHCP server. Automatic address assignment via Zeroconf (or DHCP) is not recommended. To disable Zeroconf automatic route assignment in the 169.254.0.0 subnet, add or correct the following line in '/etc/sysconfig/network': ' ...

Ensure System is Not Acting as a Network Sniffer The system should not be acting as a network sniffer, which can capture all traffic on the network to which it is connected. Run the following to determine if any interface is running in promiscuous mode: '$ ip link | grep PROMISC'

Install Virus Scanning Software Install virus scanning software, which uses signatures to search for the presence of viruses on the filesystem. The McAfee VirusScan Enterprise for Linux virus scanning tool is provided for DoD systems. Ensure virus definition files are no older than 7 days, or their last release.

To set the runtime status of the 'net.ipv4.conf.all.accept_source_route' kernel parameter, run the following command:

Add nodev Option to Non-Root Local Partitions The 'nodev' mount option prevents files from being interpreted as character or block devices. Legitimate character and block devices should exist only in the '/dev' directory on the root partition or within chroot jails built for system services. Add the 'nodev' option to the fourth column of '/etc/fstab' for the line which controls mounting of any n ...


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