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V-268166

CAT II (Medium)

NixOS must generate audit records when concurrent logons to the same account occur from different sources.

Rule ID

SV-268166r1131137_rule

STIG

Anduril NixOS Security Technical Implementation Guide

Version

V1R2

CCIs

CCI-000172, CCI-000135

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000473-GPOS-00218, SRG-OS-000042-GPOS-00020, SRG-OS-000475-GPOS-00220

Check Content

Verify NixOS is configured to generate audit records with the following command:

$ sudo auditctl -l | grep -w lastlog

-w /var/log/lastlog -p wa -k logins

If the command does not return a watch for the lastlog file, this is a finding.

Fix Text

Configure NixOS to generate audit logs on account creations and modifications.

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

 security.audit.rules = [
   "-w /var/log/lastlog -p wa -k logins"
 ];

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