homelab/roles/base/tasks/firewall.yml

- name: Install the Uncomplicated Firewall
  ansible.builtin.apt:
    name: ufw
    state: present

- name: Install Fail2ban
  ansible.builtin.apt:
    name: fail2ban
    state: present

- name: Deny incoming traffic by default
  community.general.ufw:
    default: deny
    direction: incoming

- name: Allow outgoing traffic by default
  community.general.ufw:
    default: allow
    direction: outgoing

- name: Allow OpenSSH with rate limiting
  community.general.ufw:
    name: ssh
    rule: limit

- name: Remove Fail2ban defaults-debian.conf
  ansible.builtin.file:
    path: /etc/fail2ban/jail.d/defaults-debian.conf
    state: absent

- name: Install OpenSSH's Fail2ban jail
  ansible.builtin.template:
    src: fail2ban-ssh.conf.j2
    dest: /etc/fail2ban/jail.d/sshd.conf
    mode: "640"
  notify: restart_fail2ban

- name: Install Fail2ban IP allow list
  ansible.builtin.template:
    src: fail2ban-allowlist.conf.j2
    dest: /etc/fail2ban/jail.d/allowlist.conf
    mode: "640"
  when: fail2ban_ignoreip is defined
  notify: restart_fail2ban

- name: Enable firewall
  community.general.ufw:
    state: enabled