---

- name: Initial Gateway Setup

  hosts: initial-gateway

  become: true

  become_method: ansible.builtin.sudo

  tasks:

    # Update packages

    - name: Update all packages to their latest version

      ansible.builtin.apt:

        update_cache: true

        upgrade: "yes"

      tags: update

    - name: Install a list of packages

      ansible.builtin.apt:

        update_cache: true

        pkg:

          - git

          - bridge-utils

          - batctl

          - ntpsec

          - dnsmasq

          - iptables-persistent

          - openvpn

          - fastd

          - build-essential

          - pkg-config

          - checkinstall

          - libnl-3-dev

          - libnl-genl-3-dev

          - linux-headers-amd64

          - systemd-resolved # We current use it later, but we don't really need it

          - dkms

          - lsb-release

          - ethtool

          - python3

          - wget # for fastd-blacklist

      tags: update

    # fix systemd-resolved's default config

    - name: Stop systemd-resolved

      ansible.builtin.service:

        name: "systemd-resolved"

        state: "stopped"

      tags: config

    - name: Copy resolved.conf

      ansible.builtin.copy:

        src: "{{ server_config_dir }}/systemd-resolved/resolved.conf"

        dest: /etc/systemd/resolved.conf

        owner: root

        group: root

        mode: "0644"

      tags: config

    - name: Remove immutable attribute on resolv.conf

      ansible.builtin.file:

        dest: /etc/resolv.conf

        attributes: '-i'

      become: true

      tags: config

    - name: Create a symbolic link for resolv.conf, replacing the initial resolv.conf

      ansible.builtin.file:

        src: /run/systemd/resolve/resolv.conf

        dest: /etc/resolv.conf

        owner: root

        group: root

        state: link

        attributes: '-i'

        force: true

      become: true

      tags: config

    - name: Start systemd-resolved

      ansible.builtin.service:

        name: "systemd-resolved"

        state: "started"

        enabled: "true"

      tags: config

    - name: Ensure /etc/iproute2 exists

      ansible.builtin.file:

        path: /etc/iproute2

        state: directory

        mode: '0755'

      tags: config

    - name: Copy routing table if non-existing

      ansible.builtin.copy:

        remote_src: true

        src: /usr/share/iproute2/rt_tables

        dest: /etc/iproute2/rt_tables

        force: false

      tags: config

    - name: Add the routing table for freifunk

      ansible.builtin.blockinfile:

        path: /etc/iproute2/rt_tables

        backup: true

        block: |

          # freifunk

          33      lux

          42      icvpn

          100     vpn

      tags: config

    # Modules

    - name: Load `br_netfilter` kernel module

      community.general.modprobe:

        name: "br_netfilter"

        persistent: "present"

        state: "present"

    - name: Add `nf_conntrack` to modules

      community.general.modprobe:

        name: "nf_conntrack"

        state: "present"

        persistent: "present"

      tags: config

    # Sysctl

    - name: Add the freifunk settings to sysctl config

      ansible.builtin.blockinfile:

        path: /etc/sysctl.d/80-fflux.conf

        create: true

        block: |

          # Freifunk specific settings

          net.ipv4.ip_forward=1

          net.ipv4.icmp_errors_use_inbound_ifaddr=1

          net.bridge.bridge-nf-call-arptables = 0

          net.bridge.bridge-nf-call-ip6tables = 0

          net.bridge.bridge-nf-call-iptables = 0

          net.ipv6.conf.all.forwarding=1

          net.ipv6.conf.all.autoconf = 1

          net.ipv6.conf.default.autoconf = 0

          net.ipv6.conf.eth0.autoconf = 1

          net.ipv6.conf.all.accept_ra = 1

          net.ipv6.conf.default.accept_ra = 0

          net.ipv6.conf.eth0.accept_ra = 1

          net.ipv4.conf.default.rp_filter = 2

      tags: config

    - name: Reload sysctl config

      ansible.builtin.shell: sysctl --system

      tags: config

    # Basic networking

    - name: Setup network interfaces (bridge + bat0)

      ansible.builtin.template:

        src: "{{ server_config_dir }}/interface/freifunk.j2"

        dest: /etc/network/interfaces.d/freifunk

        owner: root

        group: root

        mode: "0644"

      tags: config

    - name: Pull up new interfaces

      ansible.builtin.command: /usr/sbin/ifup -a

      tags: config

    - name: Copy iptables rulesv4

      ansible.builtin.copy:

        src: "{{ server_config_dir }}/iptables/rules.v4"

        dest: /etc/iptables/rules.v4

        owner: root

        group: root

        mode: "0644"

      tags: config

    - name: Restart iptables-persistent

      ansible.builtin.service:

        name: "netfilter-persistent"

        state: "restarted"

        enabled: true

      tags: config

    - name: Setup dnsmasq config w/ IPv4 ranges

      ansible.builtin.template:

        src: "{{ server_config_dir }}/dnsmasq/fflux.j2"

        dest: /etc/dnsmasq.d/fflux

        owner: root

        group: root

        mode: "0644"

      tags: config

    # fastd

    - name: Make sure fastd is disabled and stopped

      ansible.builtin.service:

        name: "fastd"

        state: "stopped"

        enabled: false

      tags: config

    - name: Create the fflux dir inside of fastd

      ansible.builtin.file:

        path: /etc/fastd/fflux

        state: directory

        mode: "0755"

      tags: config

    - name: Setup fastd (fflux) config w/ MAC address

      ansible.builtin.template:

        src: "{{ server_config_dir }}/fastd/fastd.conf.j2"

        dest: /etc/fastd/fflux/fastd.conf

        owner: root

        group: root

        mode: "0644"

      tags: config

    - name: Create peers-gw directory in fastd/fflux

      ansible.builtin.file:

        path: /etc/fastd/fflux/peers-gw

        state: directory

        mode: "0755"

      tags: config

    - name: List all peers but ourselves

      ansible.builtin.find:

        path: "{{ server_config_dir }}/fastd/peers-gw/"

        excludes: "{{ inventory_hostname }}"

      delegate_to: localhost

      become: false

      register: peers_to_copy

      tags: config

    - name: Copy fastd peers

      ansible.builtin.copy:

        src: "{{ item.path }}"

        dest: /etc/fastd/fflux/peers-gw/

        owner: root

        mode: "0644"

      with_items: "{{ peers_to_copy.files }}"

      tags: config

    - name: Copy fastd blacklist script

      ansible.builtin.copy:

        src: "{{ server_scripts_dir }}/fastd-blacklist.sh"

        dest: /etc/fastd/fflux/fastd-blacklist.sh

        owner: root

        group: root

        mode: "0755"

      tags: config

---

- name: Initial Server Setup

  hosts: initial

  become: true

  vars_files:

    - ../user_vars.yml

  vars:

    password: Welcome1234

    ansible_managed: "This file is managed by Ansible. Do not modify."

  tasks:

    - name: Update + Upgrade packages

      ansible.builtin.apt:

        upgrade: true

        update_cache: true

      tags: basic

    - name: Install some basic packages

      ansible.builtin.apt:

        pkg:

          - sudo

          - git

          - vim

          - python3

          - python3-pip

      tags: basic

    # Change Hostname

    - name: "Update Hostnames"

      ansible.builtin.hostname:

        name: "{{ inventory_hostname }}"

      tags: hostname

    # Update /etc/hosts

    - name: Make sure an IPV4 entry in /etc/hosts exists

      ansible.builtin.lineinfile:

        path: /etc/hosts

        regexp: "^{{ ansible_default_ipv4.address }}"

        line: "{{ ansible_default_ipv4.address }} {{ inventory_hostname }} {{ inventory_hostname }}.freifunk.lu"

        state: present

      tags: network,hostname,dns

    - name: Make sure an IPV6 entry in /etc/hosts exists

      ansible.builtin.lineinfile:

        path: /etc/hosts

        regexp: "^{{ ansible_default_ipv6.address }}"

        line: "{{ ansible_default_ipv6.address }} {{ inventory_hostname }} {{ inventory_hostname }}.freifunk.lu"

        state: present

      tags: network,hostname,dns

    # SSH security improvements (EmptyPass, PassAuth, RootLogin)

    - name: Disable SSH Password Auth

      ansible.builtin.copy:

        dest: /etc/ssh/sshd_config.d/disable_password_auth.conf

        owner: root

        mode: u=rw,g=r,o=r

        content: |

          # {{ ansible_managed }}

          PasswordAuthentication no

      tags: network,ssh

      register: pass_auth

    - name: Remove SSH Password Auth from sshd_config

      ansible.builtin.lineinfile:

        path: /etc/ssh/sshd_config

        regex: "^PasswordAuthentication"

        line: "# PasswordAuthentication No"

      tags: network,ssh

      register: pass_auth_sshd

    - name: Disable SSH Empty Password

      ansible.builtin.copy:

        dest: /etc/ssh/sshd_config.d/disable_empty_password.conf

        owner: root

        mode: u=rw,g=r,o=r

        content: |

          # {{ ansible_managed }}

          PermitEmptyPasswords no

      tags: network,ssh

      register: empty_pass

    - name: Remove SSH Empty Password from sshd_config

      ansible.builtin.lineinfile:

        path: /etc/ssh/sshd_config

        regex: "^PermitEmptyPasswords"

        line: "# PermitEmptyPasswords No"

      tags: network,ssh

      register: empty_pass_sshd

    - name: Disable SSH Root Login

      ansible.builtin.copy:

        dest: /etc/ssh/sshd_config.d/disable_root_login.conf

        owner: root

        mode: u=rw,g=r,o=r

        content: |

          # {{ ansible_managed }}

          PermitRootLogin no

      tags: network,ssh

      register: root_login

    - name: Remove SSH Root Login from sshd_config

      ansible.builtin.lineinfile:

        path: /etc/ssh/sshd_config

        regex: "^PermitRootLogin"

        line: "# PermitRootLogin No"

      tags: network,ssh

      register: root_login_sshd

    - name: Reload SSHD

      ansible.builtin.service:

        name: "sshd"

        state: "reloaded"

      tags: network,ssh

      when: pass_auth.changed or pass_auth_sshd.changed or empty_pass.changed or empty_pass_sshd.changed or root_login.changed or root_login_sshd.changed

    # Create Freifunk Users

    - name: Create member users

      ansible.builtin.user:

        name: "{{ item.username }}"

        password: "{{ password | password_hash('sha512') }}"

        update_password: "on_create"

        groups:

          - sudo

        append: true

        shell: /bin/bash

        state: present

      loop: "{{ users_member }}"

      tags: users

    - name: Create system users (no password)

      ansible.builtin.user:

        name: "{{ item.username }}"

        groups:

          - sudo

        append: true

        shell: /bin/bash

        state: present

      loop: "{{ users_system }}"

      tags: users

    - name: Change shell for root to bash

      ansible.builtin.user:

        name: "root"

        shell: /bin/bash

      tags: users

    - name: Add color etc. into root bashrc

      ansible.builtin.blockinfile:

        marker: "# {mark} ANSIBLE MANAGED BLOCK / Enhanced root bashrc"

        block: "{{ lookup('ansible.builtin.file', '{{ server_config_dir }}/bashrc_root_config') }}"

        path: /root/.bashrc

      tags: users

    - name: Add SSH key for users from vars

      ansible.posix.authorized_key:

        user: "{{ item.username }}"

        state: present

        key: "{{ lookup('file', item.key_path) }}"

      tags: users

      loop: "{{ users_member | union(users_system) }}"

    - name: Allow for password-less sudo

      # Not done via community.general.sudoders because it does not support

      # sudo-ing into users without a passsword.

      ansible.builtin.copy:

        dest: /etc/sudoers.d/passwordless-sudo

        content: '%sudo   ALL=(ALL:ALL) NOPASSWD: ALL'

        owner: root

        group: root

        mode: '0440'

      tags: users