kubeasz/roles/os-harden/tasks/sysctl.yml

---
- name: protect sysctl.conf
  file:
    path: '/etc/sysctl.conf'
    owner: 'root'
    group: 'root'
    mode: '0440'
    state: touch
    modification_time: preserve
    access_time: preserve

- name: set Daemon umask, do config for rhel-family | NSA 2.2.4.1
  template:
    src: 'etc/sysconfig/rhel_sysconfig_init.j2'
    dest: '/etc/sysconfig/init'
    owner: 'root'
    group: 'root'
    mode: '0544'
  when: ansible_facts.distribution in ['Amazon', 'CentOS', 'Fedora', 'RedHat']

- name: install initramfs-tools
  apt:
    name: 'initramfs-tools'
    state: 'present'
    update_cache: true
  when:
    - ansible_facts.os_family == 'Debian'
    - os_security_kernel_enable_module_loading

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

- name: change sysctls
  block:
    - 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: true
        state: present
        reload: true
        ignoreerrors: true
      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: true
        ignoreerrors: true
      with_dict: '{{ sysctl_rhel_config }}'
      when: ((ansible_facts.distribution in ['CentOS', 'Fedora', 'RedHat']) and
            ansible_distribution_version|int is version('7', '<')) or ansible_facts.distribution == 'Amazon'

  when: ansible_virtualization_type not in ['docker', 'lxc', 'openvz']

- name: Apply ufw defaults
  template:
    src: 'etc/default/ufw.j2'
    dest: '/etc/default/ufw'
    mode: '0644'
  when:
    - ufw_manage_defaults
    - ansible_facts.distribution in ['Debian', 'Ubuntu']
  tags: ufw