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 | CCI-000366 | 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-268172r1039586_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