NixOS must not allow an unattended or automatic logon to the system via the console.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
high	V-268172	SRG-OS-000480-GPOS-00229	ANIX-00-001880	SV-268172r1131152_rule	2025-08-19	1

Description
Failure to restrict system access via the console to authenticated users negatively impacts operating system security.

ℹ️ Check
Verify NixOS does not allow an unattended or automatic logon to the system via the console with the following command: $ grep -iR autologon.user /etc/nixos If "services.xserver.displayManager.autologon.user" is defined and is not "null", this is a finding.

✔️ Fix
Configure NixOS to not allow an unattended or automatic logon to the system via the console. Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix: services.xserver.displayManager.autologon.user = null; Rebuild and switch to the new NixOS configuration: $ sudo nixos-rebuild switch A reboot is required for the changes to take effect.

✔️ Fix

Configure NixOS to not allow an unattended or automatic logon to the system via the console. Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix: services.xserver.displayManager.autologon.user = null; Rebuild and switch to the new NixOS configuration: $ sudo nixos-rebuild switch A reboot is required for the changes to take effect.