TOSS 5 must use a Linux Security Module configured to enforce limits on system services.

Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters. This requirement applies to operating systems performing security function verification/testing and/or systems and environments that require this functionality.

Note: At lower classification levels (CUI, Secret) where vast amounts of data are processed and a performance impact is occurring, an authorizing official can consider this requirement not applicable. Confirm that TOSS verifies the correct operation of all security functions. Determine if "SELinux" is active and in "Enforcing" mode using the following command: $ sudo getenforce Enforcing If "SELinux" is not active or not in "Enforcing" mode, this is a finding.

Configure the operating system to verify correct operation of all security functions. Set the "SELinux" status and the "Enforcing" mode by modifying the "/etc/selinux/config" file to have the following line: SELINUX=enforcing Restart the system for the changes to take effect.