Disable LDAP Server (slapd)

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Description

The Lightweight Directory Access Protocol (LDAP) is a service that provides a method for looking up information from a central database.

Rationale

If the system will not need to act as an LDAP server, it is recommended that the software be disabled to reduce the potential attack surface.

Remediation

Shell script

The following script can be run on the host to remediate the issue.

#!/bin/bash

# Remediation is applicable only in certain platforms
if dpkg-query --show --showformat='${db:Status-Status}' 'linux-base' 2>/dev/null | grep -q '^installed$'; then

SYSTEMCTL_EXEC='/usr/bin/systemctl'
if [[ $("$SYSTEMCTL_EXEC" is-system-running) != "offline" ]]; then
  "$SYSTEMCTL_EXEC" stop 'slapd.service'
fi
"$SYSTEMCTL_EXEC" disable 'slapd.service'
"$SYSTEMCTL_EXEC" mask 'slapd.service'
# Disable socket activation if we have a unit file for it
if "$SYSTEMCTL_EXEC" -q list-unit-files slapd.socket; then
    if [[ $("$SYSTEMCTL_EXEC" is-system-running) != "offline" ]]; then
      "$SYSTEMCTL_EXEC" stop 'slapd.socket'
    fi
    "$SYSTEMCTL_EXEC" mask 'slapd.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 'slapd.service' || true

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

Ansible playbook

The following playbook can be run with Ansible to remediate the issue.

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_slapd_disabled

- name: Disable LDAP Server (slapd) - Collect systemd Services Present in the System
  ansible.builtin.command: systemctl -q list-unit-files --type service
  register: service_exists
  changed_when: false
  failed_when: service_exists.rc not in [0, 1]
  check_mode: false
  when: '"linux-base" in ansible_facts.packages'
  tags:
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_slapd_disabled

- name: Disable LDAP Server (slapd) - Ensure slapd.service is Masked
  ansible.builtin.systemd:
    name: slapd.service
    state: stopped
    enabled: false
    masked: true
  when:
  - '"linux-base" in ansible_facts.packages'
  - service_exists.stdout_lines is search("slapd.service", multiline=True)
  tags:
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_slapd_disabled

- name: Unit Socket Exists - slapd.socket
  ansible.builtin.command: systemctl -q list-unit-files slapd.socket
  register: socket_file_exists
  changed_when: false
  failed_when: socket_file_exists.rc not in [0, 1]
  check_mode: false
  when: '"linux-base" in ansible_facts.packages'
  tags:
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_slapd_disabled

- name: Disable LDAP Server (slapd) - Disable Socket slapd
  ansible.builtin.systemd:
    name: slapd.socket
    enabled: false
    state: stopped
    masked: true
  when:
  - '"linux-base" in ansible_facts.packages'
  - socket_file_exists.stdout_lines is search("slapd.socket", multiline=True)
  tags:
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_slapd_disabled