ansible-collection-hardening/tasks/sysctl.yml

---
- name: protect sysctl.conf
  file:
    path: '/etc/sysctl.conf'
    owner: 'root'
    group: 'root'
    mode: '0440'

- name: set Daemon umask, do config for rhel-family | NSA 2.2.4.1
  template:
    src: 'rhel_sysconfig_init.j2'
    dest: '/etc/sysconfig/init'
    owner: 'root'
    group: 'root'
    mode: '0544'
  when: ansible_distribution == 'RedHat' or ansible_distribution == 'Fedora' or ansible_distribution == 'CentOS'

- name: install initramfs-tools
  apt:
    name: 'initramfs-tools'
    state: 'installed'
    update_cache: true
  when: ansible_os_family == 'Debian' and os_security_kernel_enable_module_loading

- name: rebuild initramfs with starting pack of modules, if module loading at runtime is disabled
  template:
    src: 'modules.j2'
    dest: '/etc/initramfs-tools/modules'
    owner: 'root'
    group: 'root'
    mode: '0440'
  when: ansible_os_family == 'Debian' and os_security_kernel_enable_module_loading
  register: initramfs

- name: update-initramfs
  command: 'update-initramfs -u'
  when: initramfs.changed

- name: create a combined sysctl-dict if overwrites are defined
  set_fact:
    sysctl_config: '{{ sysctl_config | combine(sysctl_overwrite) }}'
  when: sysctl_overwrite | default()

- name: Change various sysctl-settings, look at the sysctl-vars file for documentation
  sysctl:
    name: '{{ item.key }}'
    value: '{{ item.value }}'
    sysctl_set: yes
    state: present
    reload: yes
    ignoreerrors: yes
  with_dict: '{{ sysctl_config }}'

- name: Change various sysctl-settings on rhel6-hosts or older, look at the sysctl-vars file for documentation
  sysctl:
    name: '{{ item.key }}'
    value: '{{ item.value }}'
    state: present
    reload: yes
    ignoreerrors: yes
  with_dict: '{{ sysctl_rhel_config }}'
  when: (ansible_distribution == 'RedHat' or ansible_distribution == 'Fedora' or ansible_distribution == 'CentOS') and ansible_distribution_major_version < '7'

- name: Apply ufw defaults
  template:
    src: 'ufw.j2'
    dest: '/etc/default/ufw'
  when: ufw_manage_defaults and (ansible_distribution == 'Debian' or ansible_distribution == 'Ubuntu')
  tags: ufw