Disable Samba

An XCCDF Rule

Description

The smb service can be disabled with the following command:

$ sudo systemctl mask --now smb.service

Rationale

Running a Samba server provides a network-based avenue of attack, and should be disabled if not needed.

ID: xccdf_org.ssgproject.content_rule_service_smb_disabled
Severity: Low
References: CCI-001436
Updated: about 1 month ago

Remediation Templates

include disable_smb
class disable_smb {
  service {'smb':
    enable => false,
    ensure => 'stopped',
  }
}

[customizations.services]
masked = ["smb"]

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - disable_strategy
  - low_complexity  - low_disruption
  - low_severity
  - no_reboot_needed
  - service_smb_disabled
- name: Disable Samba - 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: '"kernel" in ansible_facts.packages'
  tags:
  - disable_strategy
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed
  - service_smb_disabled

- name: Disable Samba - Ensure smb.service is Masked
  ansible.builtin.systemd:
    name: smb.service
    state: stopped
    enabled: false
    masked: true
  when:
  - '"kernel" in ansible_facts.packages'
  - service_exists.stdout_lines is search("smb.service", multiline=True)
  tags:
  - disable_strategy
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed
  - service_smb_disabled

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

- name: Disable Samba - Disable Socket smb
  ansible.builtin.systemd:
    name: smb.socket
    enabled: false
    state: stopped
    masked: true
  when:
  - '"kernel" in ansible_facts.packages'
  - socket_file_exists.stdout_lines is search("smb.socket", multiline=True)
  tags:
  - disable_strategy
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed
  - service_smb_disabled

Disable Samba

Description

Rationale

Remediation Templates

A Puppet Snippet

OS Build Blueprint

An Ansible Snippet