NixOS must be configured to use AppArmor.

Users' home directories/folders may contain information of a sensitive nature. Nonprivileged users should coordinate any sharing of information with a system administrator (SA) through shared resources.

Satisfies: SRG-OS-000480-GPOS-00230, SRG-OS-000368-GPOS-00154

Verify NixOS is configured to use AppArmor with the following command:

$ sudo systemctl status apparmor.service

apparmor.service - Load AppArmor policies Loaded: loaded (/etc/systemd/system/apparmor.service; enabled; present: enabled) Active: active (running) since Sat 2022-06-04 02:51:43 UTC; 13min ago

If the "apparmor.service" is not enabled and active, this is a finding.

Configure NixOS to use AppArmor.

Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix:

security.apparmor.enable = true;

Rebuild and switch to the new NixOS configuration: $ sudo nixos-rebuild switch

A reboot is required for the changes to take effect.