Disable ypserv Service

An XCCDF Rule

Description

The ypserv service, which allows the system to act as a client in a NIS or NIS+ domain, should be disabled. The ypserv service can be disabled with the following command:

$ sudo systemctl mask --now ypserv.service

Rationale

Disabling the ypserv service ensures the system is not acting as a client in a NIS or NIS+ domain. This service should be disabled unless in use.

ID: xccdf_org.ssgproject.content_rule_service_ypserv_disabled
Severity: Medium
References: 2.2.10

CCE-90759-2
Updated: 8 months ago

apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
spec:
  config:
    ignition:
      version: 3.1.0    systemd:
      units:
      - name: ypserv.service
        enabled: false
        mask: true
      - name: ypserv.socket
        enabled: false
        mask: true


[customizations.services]
disabled = ["ypserv"]

- name: Block Disable service ypserv
  block:

  - name: Disable service ypserv
    block:
    - name: Disable service ypserv
      systemd:
        name: ypserv.service
        enabled: 'no'
        state: stopped
        masked: 'yes'
    rescue:

    - name: Intentionally ignored previous 'Disable service ypserv' failure, service
        was already disabled
      meta: noop
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CCE-90759-2
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_ypserv_disabled

- name: Unit Socket Exists - ypserv.socket
  command: systemctl -q list-unit-files ypserv.socket
  register: socket_file_exists
  changed_when: false
  failed_when: socket_file_exists.rc not in [0, 1]
  check_mode: false
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CCE-90759-2
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_ypserv_disabled

- name: Disable socket ypserv
  systemd:
    name: ypserv.socket
    enabled: 'no'
    state: stopped
    masked: 'yes'
  when:
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  - socket_file_exists.stdout_lines is search("ypserv.socket",multiline=True)
  tags:
  - CCE-90759-2
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_ypserv_disabled

include disable_ypserv

class disable_ypserv {
  service {'ypserv':
    enable => false,
    ensure => 'stopped',  }
}

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

SYSTEMCTL_EXEC='/usr/bin/systemctl'
"$SYSTEMCTL_EXEC" stop 'ypserv.service'
"$SYSTEMCTL_EXEC" disable 'ypserv.service'"$SYSTEMCTL_EXEC" mask 'ypserv.service'
# Disable socket activation if we have a unit file for it
if "$SYSTEMCTL_EXEC" -q list-unit-files ypserv.socket; then
    "$SYSTEMCTL_EXEC" stop 'ypserv.socket'
    "$SYSTEMCTL_EXEC" mask 'ypserv.socket'
fi
# The service may not be running because it has been started and failed,
# so let's reset the state so OVAL checks pass.
# Service should be 'inactive', not 'failed' after reboot though.
"$SYSTEMCTL_EXEC" reset-failed 'ypserv.service' || true

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi

Disable ypserv Service

Description

Rationale

Remediation - Kubernetes Patch

Remediation - OS Build Blueprint

Remediation - Ansible

Remediation - Puppet

Remediation - Shell Script