NixOS must notify the system administrator (SA) and information system security officer (ISSO) (at a minimum) when allocated audit record storage volume reaches 75 percent utilization.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-268101 | ANIX-00-000400 | SV-268101r1039599_rule | Medium |
| Description |
| If security personnel are not notified immediately when storage volume reaches 75 percent utilization, they are unable to plan for audit record storage capacity expansion. Satisfies: SRG-OS-000046-GPOS-00022, SRG-OS-000343-GPOS-00134 |
| STIG | Date |
| Anduril NixOS Security Technical Implementation Guide | 2024-10-25 |
Details
| Check Text (C-72025r1039598_chk) |
| Verify NixOS notifies the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity with the following command: $ sudo grep -w space_left_action /etc/audit/auditd.conf space_left_action = syslog If the "space_left_action" parameter is missing, commented out, or set to blanks, this is a finding. If the "space_left_action" is set to "syslog", the system logs the event, but does not generate a notification, this is a finding. If the "space_left_action" is set to "exec", the system executes a designated script. If this script does not inform the SA of the event, this is a finding. If the "space_left_action" is set to "email" check the value of the "action_mail_acct" parameter with the following command: $ sudo grep action_mail_acct /etc/audit/auditd.conf action_mail_acct root@localhost The "action_mail_acct" parameter, if missing, defaults to "root". If the "action_mail_acct" parameter is not set to the email address of the SA and/or ISSO, this is a finding. Note: If the email address of the SA is on a remote system, a mail package must be available. |
| Fix Text (F-71928r1039567_fix) |
| Configure NixOS to initiate an action to notify the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity. If the space_left_action parameter is set to "syslog", make sure the event being logged generates a notification to the SA and ISSO. If the space_left_action parameter is set to "exec", make sure the command being executed notifies the SA and ISSO. If the space_left_action parameter is set to "email" set the action_mail_acct parameter to an email address for the SA and ISSO. Add or update the 'environment.etc."audit/auditd.conf".text' configuration in /etc/nixos/configuration.nix to include the following: space_left_action = syslog For example, an updated configuration of 'environment.etc."audit/auditd.conf".text' would look like the following in /etc/nixos/configuration.nix ('...' denoting that the 'environment.etc."audit/auditd.conf".text' configuration may have other options configured): environment.etc."audit/auditd.conf".text = [ '' ... space_left_action = syslog ... '' ]; Rebuild the NixOS configuration with the following command: $ sudo nixos-rebuild switch |