boxen/playbooks/tailscale.yml

# https://tailscale.com/download/linux/debian-bullseye
- name: Install Tailscale
  hosts: all
  become: true
  tasks:

    # curl -fsSL https://pkgs.tailscale.com/stable/debian/bullseye.noarmor.gpg | sudo tee /usr/share/keyrings/tailscale-archive-keyring.gpg >/dev/null
    - name: Download Tailscale package signing key
      ansible.builtin.get_url:
        url: https://pkgs.tailscale.com/stable/debian/bullseye.noarmor.gpg
        dest: /usr/share/keyrings/tailscale-archive-keyring.gpg

    # curl -fsSL https://pkgs.tailscale.com/stable/debian/bullseye.tailscale-keyring.list | sudo tee /etc/apt/sources.list.d/tailscale.list
    - name: Add Tailscale repository
      ansible.builtin.apt_repository:
        repo: deb [signed-by=/usr/share/keyrings/tailscale-archive-keyring.gpg] https://pkgs.tailscale.com/stable/debian bullseye main
        state: present

    # sudo apt-get update
    - name: Update apt-get
      ansible.builtin.apt:
        update_cache: true

    # sudo apt-get install tailscale
    - name: Install Tailscale
      ansible.builtin.package:
        name: tailscale
        state: present

# https://tailscale.com/kb/1077/secure-server-ubuntu-18-04/
- name: Only allow connections over Tailscale
  hosts: all
  become: true
  tasks:

    - name: Get Tailscale status
      ansible.builtin.command: tailscale status --json
      register: tailscale_status
      changed_when: false

    - name: Only allow connections over Tailscale
      when: _tailscale_status.BackendState == "Running"
      vars:
        _tailscale_status: "{{ tailscale_status.stdout | from_json }}"
      block:

        - name: Install ufw
          ansible.builtin.package:
            name: ufw
            state: present

        - name: Allow access over tailscale
          community.general.ufw:
            state: enabled
            rule: allow
            interface_in: tailscale0

        - name: Restrict incoming traffic
          community.general.ufw:
            default: deny
            direction: "{{ item }}"
          loop:
            - incoming

        - name: Allow access to HTTP(S)
          community.general.ufw:
            rule: allow
            port: "{{ item }}"
            proto: tcp
          loop:
            - http
            - https

      notify:
        - Reload ufw
        - Restart ssh

  handlers:
    - name: Reload ufw
      ansible.builtin.service:
        name: ufw
        state: reloaded

    - name: Restart ssh
      ansible.builtin.service:
        name: ssh
        state: restarted