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V-268130

CAT I (High)

NixOS must store only encrypted representations of passwords.

Rule ID

SV-268130r1131065_rule

STIG

Anduril NixOS Security Technical Implementation Guide

Version

V1R2

CCIs

CCI-004062

Discussion

Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised.

Check Content

Verify NixOS stores only encrypted representations of passwords with the following command: 

$ grep ENCRYPT_METHOD /etc/login.defs

ENCRYPT_METHOD SHA512

If "ENCRYPT_METHOD" does not equal SHA512 or greater, is commented out, or is missing, this is a finding.

Fix Text

Configure NixOS to store only encrypted representations of passwords. 

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

security.loginDefs.settings.ENCRYPT_METHOD = "SHA512";

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