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V-268178

CAT II (Medium)

NixOS must prohibit the use of cached authenticators after one day.

Rule ID

SV-268178r1131164_rule

STIG

Anduril NixOS Security Technical Implementation Guide

Version

V1R2

CCIs

CCI-002007

Discussion

If cached authentication information is out-of-date, the validity of the authentication information may be questionable.

Check Content

Verify NixOS, for PKI-based authentication, only caches authenticators for one day with the following command:

$ sudo grep expiration /etc/sssd/sssd.conf

offline_credentials_expiration = 1

If the offline_credentials_expiration is not set to "1" or is commented out, this is a finding.

Fix Text

Configure NixOS to prohibit the use of cached credentials older than one day.

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

Note: The entire sssd.conf must be entered in this option.

 services.sssd.config = ''
  ...
  [pam]
  offline_credentials_expiration = 1
  ...
 '';

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