NixOS must prohibit the use of cached authenticators after one day.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-268178 | ANIX-00-002050 | SV-268178r1039543_rule | Medium |
| Description |
| If cached authentication information is out-of-date, the validity of the authentication information may be questionable. |
| STIG | Date |
| Anduril NixOS Security Technical Implementation Guide | 2024-10-25 |
Details
| Check Text (C-72102r1039420_chk) |
| 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 (F-72005r1039542_fix) |
| Configure /etc/nixos/configuration.nix to prohibit the use of cached credentials older than one day by adding the following configuration settings. Note that the entire sssd.conf must be entered in this option: services.sssd.config = '' ... [pam] offline_credentials_expiration = 1 ... ''; Rebuild the system with the following command: $ sudo nixos-rebuild switch |