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

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-268178ANIX-00-002050SV-268178r1131164_ruleCCI-002007medium
Description
If cached authentication information is out-of-date, the validity of the authentication information may be questionable.
STIGDate
Anduril NixOS Security Technical Implementation Guide2025-08-19

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

IAC-10.10Expiration of Cached Authenticators
1.00
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (45) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-10Concurrent Session Control
1.00
AC-17(10)Authenticate Remote Commands
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(11)Usage Conditions
1.00
AC-2(2)Automated Temporary and Emergency Account Management
1.00
AC-2(3)Disable Accounts
1.00
AC-2(4)Automated Audit Actions
1.00
AC-3Access Enforcement
1.00
AC-3(4)Discretionary Access Control
1.00
AC-4(17)Domain Authentication
1.00

+35 more (top 10 by confidence shown)

CCI1 mapping
CCI-002007
1.00

Details

Check Text (C-268178r1131164_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-72005r1131163_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