mono-infrastructure/ansible/playbooks/tasks/harden.yml

---
# Initial hardening ideas from CIS
- name: sysctl hardening and limits
  block:
    - name: create combined sysctl-dict if overwrites are defined
      set_fact:
        sysctl_config: '{{ sysctl_config | combine(sysctl_overwrite) }}'
      when: sysctl_overwrite | default()

    - name: sysctl
      sysctl:
        name: '{{ item.key }}'
        value: '{{ item.value }}'
        state: present
        ignoreerrors: true
        sysctl_set: true
        sysctl_file: /etc/sysctl.d/99-ansible.conf
      with_dict: '{{ sysctl_config }}'
      tags:
        - harden
        - kernel

    - name: security limits
      copy:
        dest: "/etc/security/limits.d/cis.conf"
        owner: root
        group: root
        mode: '0644'
        content: |
          * hard core 0          
      tags:
        - harden

- name: Standard login settings
  block:
    - name: useradd defaults
      lineinfile:
        line: "INACTIVE=30"
        regexp: "^INACTIVE=.*"
        path: "/etc/login.defs"
      tags:
        - harden

    - name: login defs maximum days
      replace:
        path: /etc/login.defs
        regexp: '(PASS_MAX_DAYS).*\d+'
        replace: '\1\t{{ login_max_days }}'
      tags:
        - harden

    - name: login defs minimum days
      replace:
        path: /etc/login.defs
        regexp: '(PASS_MIN_DAYS).*\d+'
        replace: '\1\t{{ login_min_days }}'
      tags:
        - harden

    - name: login defs minimum length
      replace:
        path: /etc/login.defs
        regexp: '(PASS_MIN_LEN).*\d+'
        replace: '\1\t{{ login_min_len }}'
      tags:
        - harden

    - name: login defs warn age
      replace:
        path: /etc/login.defs
        regexp: '(PASS_WARN_AGE).*\d+'
        replace: '\1\t{{ login_warn_age }}'
      tags:
        - harden

    - name: cron directories permissions
      file:
        path: '{{ item }}'
        owner: root
        group: root
        mode: '0700'
        state: directory
      loop: '{{ login_cron_directories }}'
      tags:
        - harden

    - name: Create cron/at allows
      file:
        path: '{{ item }}'
        owner: root
        group: root
        mode: '0600'
        state: touch
      loop: '{{ login_cron_allows }}'
      tags:
        - harden

    - name: Remove cron/at denies
      file:
        path: '{{ item }}'
        state: absent
      loop: '{{ login_cron_denies }}'
      tags:
        - harden

    - name: pwquality - minlen
      lineinfile:
        line: "minlen = 14"
        regexp: "^# minlen =.*"
        path: "/etc/security/pwquality.conf"
      tags:
        - harden

    - name: pwquality - dcredit
      lineinfile:
        line: "dcredit = -1"
        regexp: "^# dcredit =.*"
        path: "/etc/security/pwquality.conf"
      tags:
        - harden

    - name: pwquality - ucredit
      lineinfile:
        line: "ucredit = -1"
        regexp: "^# ucredit =.*"
        path: "/etc/security/pwquality.conf"
      tags:
        - harden

    - name: pwquality - lcredit
      lineinfile:
        line: "lcredit = -1"
        regexp: "^# lcredit =.*"
        path: "/etc/security/pwquality.conf"
      tags:
        - harden

    - name: pwquality - ocredit
      lineinfile:
        line: "ocredit = -1"
        regexp: "^# ocredit =.*"
        path: "/etc/security/pwquality.conf"
      tags:
        - harden

- name: Remove packages not allowed by CIS
  package:
    name: "{{ remove_packages }}"
    state: absent
  tags:
    - harden

- name: Auditd
  block:
    - name: Ensure auditd is installed
      package:
        name: audit
        state: present
      tags:
        - harden

    - name: Ensure auditd buffer is OK
      replace:
        path: /etc/audit/rules.d/audit.rules
        regexp: '-b \d+'
        replace: '-b {{ audit_buffer }}'
      notify:
        - regenerate_auditd_rules
      tags:
        - harden

    - name: Ensure collection audit rules are available
      template:
        src: "etc/audit/rules.d/collection.rules.j2"
        dest: "/etc/audit/rules.d/collection.rules"
        owner: root
        group: root
        mode: '0600'
        backup: true
      notify:
        - regenerate_auditd_rules
        - restart_auditd
      tags:
        - harden

- name: Disable Services
  service:
    name: "{{ item }}"
    enabled: false
    state: stopped
  with_items: "{{ disable_svc }}"
  register: service_check
  failed_when: service_check is failed and not 'Could not find the requested service' in service_check.msg
  tags:
    - services
    - harden

- name: modprobe settings
  block:
    - name: remove vfat from filesystem list if we are EFI
      set_fact:
        modprobe_unused_filesystems: "{{ modprobe_unused_filesystems | difference('vfat') }}"
      when:
        - efi_installed.stat.isdir is defined
        - efi_installed.stat.isdir
      tags:
        - efi

    - name: disable unused filesystems
      template:
        src: "etc/modprobe.d/cis.conf.j2"
        dest: "/etc/modprobe.d/cis.conf"
        owner: 'root'
        group: 'root'
        mode: '0644'
      tags:
        - harden

- name: Set init umask
  lineinfile:
    dest: /etc/sysconfig/init
    state: present
    regexp: ^umask
    line: "umask 027"
    create: true
    owner: root
    group: root
    mode: '0644'
  when: ansible_distribution_major_version == '7'
  tags:
    - harden

- name: cis sudoers configuration
  copy:
    dest: /etc/sudoers.d/cis
    owner: root
    group: root
    mode: '0440'
    content: |
      Defaults use_pty
      Defaults logfile="/var/log/sudo.log"      
  tags:
    - harden

- name: Remove packages not allowed by CIS
  package:
    name: "{{ remove_packages }}"
    state: absent
  tags:
    - harden

- name: grub and kernel
  block:
    - name: Reset grub link if we are EFI
      set_fact:
        grub_config_path_link: "{{ grub_config_path_efi }}"
      when: efi_installed.stat.isdir is defined and efi_installed.stat.isdir and grub_config_path_efi is defined
      tags:
        - efi

    - name: grub.d directory
      file:
        name: /etc/default/grub.d
        owner: root
        group: root
        mode: '0755'
        state: directory
        recurse: true
      tags:
        - grub
        - kernel
        - harden

    - name: Append /etc/default/grub file
      lineinfile:
        path: /etc/default/grub
        line: for x in $(ls /etc/default/grub.d) ; do source /etc/default/grub.d/$x ; done
        state: present
      tags:
        - grub
        - kernel
        - harden

    - name: Grub command line defaults
      copy:
        dest: "/etc/default/grub.d/99-rocky.cfg"
        owner: root
        group: root
        mode: '0644'
        content: 'GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT {{ kernel_boot_options }}"'
      tags:
        - grub
        - kernel
        - harden

    - name: rebuild grub
      command: /usr/sbin/grub2-mkconfig -o {{ grub_config_path_link }}
      tags:
        - grub
        - kernel
        - harden