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Disable RDS Support

An XCCDF Rule

Description

The Reliable Datagram Sockets (RDS) protocol is a transport layer protocol designed to provide reliable high-bandwidth, low-latency communications between nodes in a cluster. To configure the system to prevent the rds kernel module from being loaded, add the following line to the file /etc/modprobe.d/rds.conf: 

install rds /bin/true
To configure the system to prevent the rds from being used, add the following line to file /etc/modprobe.d/rds.conf: 
blacklist rds

Rationale

Disabling RDS protects the system against exploitation of any flaws in its implementation.

ID
xccdf_org.ssgproject.content_rule_kernel_module_rds_disabled
Severity
Low
References
Updated



Remediation - Kubernetes Patch

---
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
spec:
  config:
    ignition:

Remediation - Shell Script

# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ]; then

if LC_ALL=C grep -q -m 1 "^install rds" /etc/modprobe.d/rds.conf ; then
	
	sed -i 's#^install rds.*#install rds /bin/true#g' /etc/modprobe.d/rds.conf

Remediation - Ansible

- name: Ensure kernel module 'rds' is disabled
  lineinfile:
    create: true
    dest: /etc/modprobe.d/rds.conf
    regexp: install\s+rds
    line: install rds /bin/false