NixOS must prevent the use of dictionary words for passwords.

If the operating system allows the user to select passwords based on dictionary words, then this increases the chances of password compromise by increasing the opportunity for successful guesses and brute-force attacks.

Verify NixOS prevents the use of dictionary words for passwords with the following command:

$ grep dictcheck /etc/security/pwquality.conf

dictcheck=1

If the value of "ocredit" is a positive number or is commented out, this is a finding.

Configure NixOS to check password change attempts against a dictionary.

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

environment.etc."/security/pwquality.conf".text = '' dictcheck=1 '';

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