Puppet Class: cis_security_hardening::rules::nftables_persistence

Defined in:
manifests/rules/nftables_persistence.pp

Summary

Ensure nftables rules are permanent

Overview

nftables is a subsystem of the Linux kernel providing filtering and classification of network packets/datagrams/frames. The nftables service reads the /etc/sysconfig/nftables.conf file for a nftables file or files to include in the nftables ruleset. A nftables ruleset containing the input, forward, and output base chains allow network traffic to be filtered.

Rationale: Changes made to nftables ruleset only affect the live system, you will also need to configure the nftables ruleset to apply on boot.

Examples:

class { 'cis_security_hardening::rules::nftables_persistence':
    enforce => true,
}

Parameters:

  • enforce (Boolean) (defaults to: false) —

    Enforce the rule



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# File 'manifests/rules/nftables_persistence.pp', line 24

class cis_security_hardening::rules::nftables_persistence (
  Boolean $enforce = false,
) {
  if $enforce {
    if(!defined(File['/etc/sysconfig/nftables.conf'])) {
      file { '/etc/sysconfig/nftables.conf':
        ensure  => file,
        owner   => 'root',
        group   => 'root',
        mode    => '0644',
        require => Package['nftables'],
      }
    }
    file_line { 'add persistence file include':
      path               => '/etc/sysconfig/nftables.conf',
      line               => 'include "/etc/nftables/nftables.rules"',
      match              => 'include "/etc/nftables/nftables.rules"',
      append_on_no_match => true,
      require            => Package['nftables'],
    }

    exec { 'dump nftables ruleset':
      command     => 'nft list ruleset > /etc/nftables/nftables.rules',
      path        => ['/bin', '/usr/bin', '/sbin', '/usr/sbin'],
      refreshonly => true,
      require     => Package['nftables'],
    }
  }
}