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Chapter 25. Securing file access by using the RHEL system role

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With the fapolicyd system role, you can prevent execution of unknown code on RHEL by using the Red Hat Ansible Automation Platform.

25.1. Configuring protection against unknown code execution with the fapolicyd RHEL system role

You can use the fapolicyd system role to prevent execution of unknown code by running an Ansible playbook.

Prerequisites

Procedure

  1. Create a playbook file, for example ~/playbook.yml, with the following content:

    ---
    - name: Preventing execution of unknown code
      hosts: all
      vars:
        fapolicyd_setup_integrity: sha256
        fapolicyd_setup_trust: rpmdb,file
        fapolicyd_add_trusted_file:
          - </usr/bin/my-ls>
          - </opt/third-party/app1>
          - </opt/third-party/app2>
      roles:
        - rhel-system-roles.fapolicyd

    You can further customize the protection by using the following variables of the linux-system-roles.fapolicyd RHEL system role:

    fapolicyd_setup_integrity
    You can set one of the following types of integrity: none, sha256, and size.
    fapolicyd_setup_trust
    You can set trust file types file,rpmd, and deb.
    fapolicyd_add_trusted_file
    You can list executable files that you trust and that fapolicyd does not prevent from executing.
  2. Validate the playbook syntax:

    # ansible-playbook ~/playbook.yml --syntax-check

    Note that this command only validates the syntax and does not protect against a wrong but valid configuration.

  3. Run the playbook:

    # ansible-playbook ~/playbook.yml

Additional resources

  • /usr/share/ansible/roles/rhel-system-roles.fapolicyd/README.md file
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