DISA STIGS Viewer

NixOS must enforce a minimum 15-character password length.

Overview

Finding ID Version Rule ID IA Controls Severity
V-268134 ANIX-00-000810 SV-268134r1039290_rule   Medium
Description
The shorter the password, the lower the number of possible combinations that need to be tested before the password is compromised. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password length is one factor of several that helps to determine strength and how long it takes to crack a password. Use of more characters in a password helps to exponentially increase the time and/or resources required to compromise the password.
STIG Date
Anduril NixOS Security Technical Implementation Guide 2024-10-25

Details

Check Text (C-72058r1039288_chk)
Verify NixOS enforces a minimum 15-character password length with the following command:

$ grep minlen /etc/security/pwquality.conf

minlen=15

If the value of "minlen" is set to less than "15", or is commented out, this is a finding.
Fix Text (F-71961r1039289_fix)
Configure NixOS to enforce password complexity.

Add/modify /etc/nixos/configuration.nix to include the following lines:

environment.etc."/security/pwquality.conf".text = ''
minlen=15
'';

Rebuild the system with the following command:

$ sudo nixos-rebuild switch