Title

NixOS must generate audit records for all account creations, modifications, disabling, and termination events. (Cat II impact)

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-000476-GPOS-00221, SRG-OS-000042-GPOS-00020, SRG-OS-000274-GPOS-00104, SRG-OS-000275-GPOS-00105, SRG-OS-000276-GPOS-00106, SRG-OS-000277-GPOS-00107, SRG-OS-000477-GPOS-00222, SRG-OS-000304-GPOS-00121

Check Content

Verify NixOS is configured to generate audit records on account events with the following command: $ sudo auditctl -l | grep /etc -w /etc/sudoers -p wa -k identity -w /etc/passwd -p wa -k identity -w /etc/shadow -p wa -k identity -w /etc/gshadow -p wa -k identity -w /etc/group -p wa -k identity -w /etc/security/opasswd -p wa -k identity If the output from the command does not include the example output, this is a finding.

Fix Text

Modify NixOS to generate audit logs on account creations and modifications. Edit /etc/nixos/configuration.nix and ensure the following options are configured: security.audit.rules = [ "-w /etc/sudoers -p wa -k identity" "-w /etc/passwd -p wa -k identity" "-w /etc/shadow -p wa -k identity" "-w /etc/gshadow -p wa -k identity" "-w /etc/group -p wa -k identity" "-w /etc/security/opasswd -p wa -k identity" ]; Rebuild the system with the following command: $ sudo nixos-rebuild switch

Additional Identifiers

Rule ID: SV-268167r1039389_rule

Vulnerability ID: V-268167

Group Title: SRG-OS-000476-GPOS-00221

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.