NixOS must prohibit the use of cached authenticators after one day.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-268178 | SRG-OS-000383-GPOS-00166 | ANIX-00-002050 | SV-268178r1131164_rule | 2025-08-19 | 1 |
| Description |
|---|
| If cached authentication information is out-of-date, the validity of the authentication information may be questionable. |
| ℹ️ Check |
|---|
| 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 |
|---|
| 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 |