Verify ufw Enabled

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Description

The ufw service can be enabled with the following command:

$ sudo systemctl enable ufw.service

Rationale

The ufw service must be enabled and running in order for ufw to protect the system

Remediation

Shell script

The following script can be run on the host to remediate the issue.

#!/bin/bash

# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ] && { ( [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ] && dpkg-query --show --showformat='${db:Status-Status}\n' 'ufw' 2>/dev/null | grep -q installed ); }; then

SYSTEMCTL_EXEC='/usr/bin/systemctl'
"$SYSTEMCTL_EXEC" unmask 'ufw.service'
"$SYSTEMCTL_EXEC" start 'ufw.service'
"$SYSTEMCTL_EXEC" enable 'ufw.service'

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi

Ansible playbook

The following playbook can be run with Ansible to remediate the issue.

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - DISA-STIG-UBTU-20-010434
  - enable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_ufw_enabled

- name: Verify ufw Enabled - Enable service ufw
  block:

  - name: Gather the package facts
    package_facts:
      manager: auto

  - name: Verify ufw Enabled - Enable Service ufw
    ansible.builtin.systemd:
      name: ufw
      enabled: true
      state: started
      masked: false
    when:
    - '"ufw" in ansible_facts.packages'
  when:
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  - ( ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
    and "ufw" in ansible_facts.packages )
  tags:
  - DISA-STIG-UBTU-20-010434
  - enable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_ufw_enabled