Puppet Class: cis_security_hardening::rules::disable_sctp

Defined in:
manifests/rules/disable_sctp.pp

Summary

Ensure SCTP is disabled

Overview

The Stream Control Transmission Protocol (SCTP) is a transport layer protocol used to support message oriented communication, with several streams of messages in one connection. It serves a similar function as TCP and UDP, incorporating features of both. It is message-oriented like UDP, and ensures reliable in-sequence transport of messages with congestion control like TCP.

Rationale: If the protocol is not being used, it is recommended that kernel module not be loaded, disabling the service to reduce the potential attack surface.

Examples:

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

Parameters:

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

    Enforce the rule



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# File 'manifests/rules/disable_sctp.pp', line 22

class cis_security_hardening::rules::disable_sctp (
  Boolean $enforce = false,
) {
  if $enforce {
    case $facts['os']['name'].downcase() {
      'debian': {
        if $facts['os']['release']['major'] > '10' {
          $command = '/bin/false'
          kmod::blacklist { 'sctp': }
        } else {
          $command = '/bin/true'
        }
      }
      'ubuntu': {
        if $facts['os']['release']['major'] >= '20' {
          $command = '/bin/false'
          kmod::blacklist { 'sctp': }
        } else {
          $command = '/bin/true'
        }
      }
      default: {
        $command = '/bin/true'
      }
    }

    kmod::install { 'sctp':
      command => $command,
    }
  }
}