Disable Network Console (netconsole)

An XCCDF Rule

Description

The netconsole service is responsible for loading the netconsole kernel module, which logs kernel printk messages over UDP to a syslog server. This allows debugging of problems where disk logging fails and serial consoles are impractical. The netconsole service can be disabled with the following command:

$ sudo systemctl mask --now netconsole.service

Rationale

The netconsole service is not necessary unless there is a need to debug kernel panics, which is not common.

ID: xccdf_org.ssgproject.content_rule_service_netconsole_disabled
Severity: Low
References: 11 12 14 15 3 8 9

APO13.01 BAI10.01 BAI10.02 BAI10.03 BAI10.05 DSS01.04 DSS05.02 DSS05.03 DSS05.05 DSS06.06

CCI-000381

4.3.3.5.1 4.3.3.5.2 4.3.3.5.3 4.3.3.5.4 4.3.3.5.5 4.3.3.5.6 4.3.3.5.7 4.3.3.5.8 4.3.3.6.1 4.3.3.6.2 4.3.3.6.3 4.3.3.6.4 4.3.3.6.5 4.3.3.6.6 4.3.3.6.7 4.3.3.6.8 4.3.3.6.9 4.3.3.7.1 4.3.3.7.2 4.3.3.7.3 4.3.3.7.4 4.3.4.3.2 4.3.4.3.3

SR 1.1 SR 1.10 SR 1.11 SR 1.12 SR 1.13 SR 1.2 SR 1.3 SR 1.4 SR 1.5 SR 1.6 SR 1.7 SR 1.8 SR 1.9 SR 2.1 SR 2.2 SR 2.3 SR 2.4 SR 2.5 SR 2.6 SR 2.7 SR 3.1 SR 3.5 SR 3.8 SR 4.1 SR 4.3 SR 5.1 SR 5.2 SR 5.3 SR 7.1 SR 7.6

A.11.2.6 A.12.1.2 A.12.5.1 A.12.6.2 A.13.1.1 A.13.2.1 A.14.1.3 A.14.2.2 A.14.2.3 A.14.2.4 A.6.2.1 A.6.2.2 A.9.1.2

CM-6(a) CM-7(a) CM-7(b)

PR.AC-3 PR.IP-1 PR.PT-3 PR.PT-4
Updated: about 1 year ago

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


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

- name: Block Disable service netconsole
  block:

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

    - name: Intentionally ignored previous 'Disable service netconsole' failure, service
        was already disabled
      meta: noop
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed
  - service_netconsole_disabled

- name: Unit Socket Exists - netconsole.socket
  command: systemctl -q list-unit-files netconsole.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:
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed
  - service_netconsole_disabled

- name: Disable socket netconsole
  systemd:
    name: netconsole.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("netconsole.socket",multiline=True)
  tags:
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed
  - service_netconsole_disabled

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

SYSTEMCTL_EXEC='/usr/bin/systemctl'
"$SYSTEMCTL_EXEC" stop 'netconsole.service'
"$SYSTEMCTL_EXEC" disable 'netconsole.service'"$SYSTEMCTL_EXEC" mask 'netconsole.service'
# Disable socket activation if we have a unit file for it
if "$SYSTEMCTL_EXEC" -q list-unit-files netconsole.socket; then
    "$SYSTEMCTL_EXEC" stop 'netconsole.socket'
    "$SYSTEMCTL_EXEC" mask 'netconsole.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 'netconsole.service' || true

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

include disable_netconsole

class disable_netconsole {
  service {'netconsole':
    enable => false,
    ensure => 'stopped',  }
}

Disable Network Console (netconsole)

Description

Rationale

Remediation - Kubernetes Patch

Remediation - OS Build Blueprint

Remediation - Ansible

Remediation - Shell Script

Remediation - Puppet