---
# Debian 10 will use firewalld with the iptables backend.
# Debian 11 will use nftables directly, with no firewalld.

- block:
  - name: Set Debian firewall packages
    when: ansible_distribution_major_version is version('10', '<=')
    ansible.builtin.set_fact:
      debian_firewall_packages:
        - firewalld
        - tidy
        - fail2ban
        - python3-systemd # for fail2ban systemd backend

  - name: Set Debian firewall packages
    when: ansible_distribution_major_version is version('11', '>=')
    ansible.builtin.set_fact:
      debian_firewall_packages:
        - fail2ban
        - libnet-ip-perl # for aggregate-cidr-addresses.pl
        - nftables
        - python3-systemd
        - curl # for nftables update scripts

  - name: Install firewall packages
    ansible.builtin.apt: pkg={{ debian_firewall_packages }} state=present cache_valid_time=3600

  - name: Remove iptables on newer Debian
    when: ansible_distribution_major_version is version('11', '>=')
    ansible.builtin.apt: pkg=iptables state=absent

  - name: Copy nftables.conf
    when: ansible_distribution_major_version is version('11', '>=')
    ansible.builtin.template: src=nftables.conf.j2 dest=/etc/nftables.conf owner=root mode=0644
    notify:
      - restart nftables
      - restart fail2ban

  - name: Create /etc/nftables extra config directory
    when: ansible_distribution_major_version is version('11', '>=')
    ansible.builtin.file: path=/etc/nftables state=directory owner=root mode=0755

  - name: Copy extra nftables configuration files
    when: ansible_distribution_major_version is version('11', '>=')
    ansible.builtin.copy: src={{ item.src }} dest=/etc/nftables/{{ item.src }} owner=root group=root mode=0644 force={{ item.force }}
    loop:
      - { src: "spamhaus-ipv4.nft", force: "no" }
      - { src: "spamhaus-ipv6.nft", force: "no" }
      - { src: "abusech-ipv4.nft", force: "no" }
      - { src: "abuseipdb-ipv4.nft", force: "yes" }
      - { src: "abuseipdb-ipv6.nft", force: "yes" }
    notify:
      - restart nftables
      - restart fail2ban

  - name: Use iptables backend in firewalld
    when: ansible_distribution_major_version is version('10', '==')
    ansible.builtin.lineinfile:
      dest: /etc/firewalld/firewalld.conf
      regexp: '^FirewallBackend=nftables$'
      line: 'FirewallBackend=iptables'
    notify:
      - restart firewalld
      - restart fail2ban

# firewalld seems to have an issue with iptables 1.8.2 when using the nftables
# backend. Using individual calls seems to work around it.
# See: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=931722
  - name: Use individual iptables calls
    when: ansible_distribution_major_version is version('10', '==')
    ansible.builtin.lineinfile:
      dest: /etc/firewalld/firewalld.conf
      regexp: '^IndividualCalls=no$'
      line: 'IndividualCalls=yes'
    notify:
      - restart firewalld
      - restart fail2ban

  - name: Copy firewalld public zone file
    when: ansible_distribution_major_version is version('10', '<=')
    ansible.builtin.template: src=public.xml.j2 dest=/etc/firewalld/zones/public.xml owner=root mode=0600

  - name: Format public.xml firewalld zone file
    when: ansible_distribution_major_version is version('10', '<=')
    command: tidy -xml -iq -m -w 0 /etc/firewalld/zones/public.xml
    notify:
      - restart firewalld
      - restart fail2ban

  - name: Copy firewalld ipsets of abusive IPs
    when: ansible_distribution_major_version is version('10', '<=')
    ansible.builtin.copy: src={{ item }} dest=/etc/firewalld/ipsets/{{ item }} owner=root group=root mode=0600
    loop:
      - abusers-ipv4.xml
      - abusers-ipv6.xml
      - spamhaus-ipv4.xml
      - spamhaus-ipv6.xml
    notify:
      - restart firewalld
      - restart fail2ban

  - name: Copy Spamhaus firewalld update script
    when: ansible_distribution_version is version('10', '<=')
    ansible.builtin.copy: src=update-spamhaus-lists.sh dest=/usr/local/bin/update-spamhaus-lists.sh mode=0755 owner=root group=root

  - name: Copy Spamhaus firewalld systemd units
    when: ansible_distribution_version is version('10', '<=')
    ansible.builtin.copy: src={{ item }} dest=/etc/systemd/system/{{ item }} mode=0644 owner=root group=root
    loop:
        - update-spamhaus-lists.service
        - update-spamhaus-lists.timer
    register: spamhaus_firewalld_systemd_units

  - name: Copy Spamhaus nftables update scripts
    when: ansible_distribution_version is version('11', '>=')
    ansible.builtin.copy: src={{ item }} dest=/usr/local/bin/{{ item }} mode=0755 owner=root group=root
    loop:
      - update-spamhaus-nftables.sh
      - aggregate-cidr-addresses.pl
      - update-abusech-nftables.sh

  - name: Copy nftables systemd units
    when: ansible_distribution_version is version('11', '>=')
    ansible.builtin.copy: src={{ item }} dest=/etc/systemd/system/{{ item }} mode=0644 owner=root group=root
    loop:
        - update-spamhaus-nftables.service
        - update-spamhaus-nftables.timer
        - update-abusech-nftables.service
        - update-abusech-nftables.timer
    register: nftables_systemd_units

  # need to reload to pick up service/timer/environment changes
  - name: Reload systemd daemon
    ansible.builtin.systemd: daemon_reload=true
    when: spamhaus_firewalld_systemd_units is changed or
          nftables_systemd_units is changed

  - name: Start and enable Spamhaus firewalld update timer
    when: ansible_distribution_version is version('10', '<=')
    ansible.builtin.systemd: name=update-spamhaus-lists.timer state=started enabled=true
    notify:
      - restart firewalld
      - restart fail2ban

  - name: Start and enable nftables update timers
    when: ansible_distribution_version is version('11', '>=')
    ansible.builtin.systemd: name={{ item }} state=started enabled=true
    loop:
      - update-spamhaus-nftables.timer
      - update-abusech-nftables.timer

  - name: Start and enable nftables
    when: ansible_distribution_major_version is version('11', '>=')
    ansible.builtin.systemd: name=nftables state=started enabled=true

  - ansible.builtin.include_tasks: fail2ban.yml
    when: ansible_distribution_major_version is version('9', '>=')
  tags: firewall

# vim: set sw=2 ts=2: