NixOS must not allow an unattended or automatic login to the system via the console.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-268172 | ANIX-00-001880 | SV-268172r1039586_rule | High |
| Description |
| Failure to restrict system access via the console to authenticated users negatively impacts operating system security. |
| STIG | Date |
| Anduril NixOS Security Technical Implementation Guide | 2024-10-25 |
Details
| Check Text (C-72096r1039584_chk) |
| Verify NixOS does not allow an unattended or automatic login to the system via the console with the following command: $ grep -iR autologin.user /etc/nixos If "services.xserver.displayManager.autoLogin.user" is defined and is not "null", this is a finding. |
| Fix Text (F-71999r1039585_fix) |
| Configure the operating system to not allow an unattended or automatic login to the system via the console. Note: Once set, the system must be rebooted for any changes to apply. Add or update the following configuration in /etc/nixos/configuration.nix: services.xserver.displayManager.autoLogin.user = null; Rebuild the NixOS configuration with the following command: $ sudo nixos-rebuild switch |