Verify nftables Service is Enabled
Description
The nftables service allows for the loading of nftables rulesets during boot,
or starting on the nftables service
The nftables service can be enabled with the following command:
$ sudo systemctl enable nftables.service
Rationale
The nftables service restores the nftables rules from the rules files referenced
in the /etc/sysconfig/nftables.conf file during boot or the starting of
the nftables service
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 ] && dpkg-query --show --showformat='${db:Status-Status}\n' 'nftables' 2>/dev/null | grep -q installed ); then
SYSTEMCTL_EXEC='/usr/bin/systemctl'
"$SYSTEMCTL_EXEC" unmask 'nftables.service'
"$SYSTEMCTL_EXEC" start 'nftables.service'
"$SYSTEMCTL_EXEC" enable 'nftables.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:
- enable_strategy
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- service_nftables_enabled
- name: Verify nftables Service is Enabled - Enable service nftables
block:
- name: Gather the package facts
package_facts:
manager: auto
- name: Verify nftables Service is Enabled - Enable Service nftables
ansible.builtin.systemd:
name: nftables
enabled: true
state: started
masked: false
when:
- '"nftables" in ansible_facts.packages'
when: ( ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman",
"container"] and "nftables" in ansible_facts.packages )
tags:
- enable_strategy
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- service_nftables_enabled
