Puppet Class: cis_security_hardening::rules::nftables_table

Defined in:
manifests/rules/nftables_table.pp

Summary

Ensure a table exists

Overview

Tables hold chains. Each table only has one address family and only applies to packets of this family. Tables can have one of five families.

Rationale: nftables doesn’t have any default tables. Without a table being build, nftables will not filter network traffic.

Examples:

class  { 'cis_security_hardening::rules::nftables_table':
    enforce => true,
    nftables_default_table => 'inet',
}

Parameters:

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

    Enforce the rule

  • nftables_default_table (Cis_security_hardening::Nftables_address_families) (defaults to: 'inet') —

    Table to be created if none exists



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

class cis_security_hardening::rules::nftables_table (
  Boolean $enforce                                                          = false,
  Cis_security_hardening::Nftables_address_families $nftables_default_table = 'inet',
) {
  if $enforce {
    $tables = fact('cis_security_hardening.nftables.tables')

    if(!($nftables_default_table in $tables)) {
      if(!defined(Package['nftables'])) {
        ensure_packages(['nftables'], {
            ensure => installed,
            before => Exec["create nft table ${nftables_default_table}"],
        })
      }

      exec { "create nft table ${nftables_default_table}":
        command => "nft create table ${nftables_default_table} filter", #lint:ignore:security_class_or_define_parameter_in_exec lint:ignore:140chars
        path    => ['/bin', '/usr/bin', '/sbin', '/usr/sbin'],
        onlyif  => "test -z \"$(nft list ruleset | grep -E '^table ${nftables_default_table}')\"",
        notify  => Exec['dump nftables ruleset'],
        require => Package['nftables'],
      }
    }
  }
}