---
# Installs the OpenVPN virtual private network server.
# ref: https://library.linode.com/networking/openvpn/debian-6-squeeze

- name: Install OpenVPN and dependencies
  apt: pkg={{ item }} state=installed
  with_items:
    - dnsmasq
    - openvpn
    - udev
  tags:
    - dependencies

- name: Generate RSA keys for the CA and Server
  command: openssl genrsa -out {{ item }}.key {{ openvpn_key_size }}
           chdir={{ openvpn_path }}
           creates={{ item }}.key
  with_items:
    - ca
    - server

- name: Create directories for clients
  file: path={{ openvpn_path}}/{{ item }} state=directory
  with_items: openvpn_clients

- name: Generate RSA keys for the clients
  command: openssl genrsa -out client.key {{ openvpn_key_size }}
           chdir={{ openvpn_path }}/{{ item }}
           creates=client.key
  with_items: openvpn_clients

- name: Set the proper permissions on all RSA keys
  file: path={{ openvpn_path }}
        recurse=yes
        state=directory
        owner=root
        group=root
        mode=600

- name: Generate CA certificate
  command: openssl req -nodes -batch -new -x509 -key {{ openvpn_ca }}.key -out {{ openvpn_ca }}.crt -days {{ openvpn_days_valid }} -subj "{{ openssl_request_subject }}/CN=ca-certificate"
           creates={{ openvpn_ca }}.crt

- name: Generate the OpenSSL configuration that will be used for the Server certificate's req and ca commands
  # Properly sets the attributes that are described here:
  # openvpn.net/index.php/open-source/documentation/howto.html#mitm
  #
  # This is required in order for the 'ns-cert-type server' option to
  # work, which is enabled by default in most standard client.conf
  # files.
  template: src=openssl-server-certificate.cnf.j2
            dest={{ openvpn_path }}/openssl-server-certificate.cnf

- name: Seed a blank database file that will be used when generating the Server's certificate
  file: path={{ openvpn_path }}/index.txt
        state=touch

- name: Seed a serial file that will be used when generating the Server's certificate
  copy: content="01"
        dest={{ openvpn_path }}/serial

- name: Generate CSR for the Server
  command: openssl req -batch -extensions server -new -key server.key -out server.csr -config {{ openvpn_path }}/openssl-server-certificate.cnf
           chdir={{ openvpn_path }}
           creates=server.csr

- name: Generate certificate for the Server
  command: openssl ca -batch -extensions server -in server.csr -out server.crt -config openssl-server-certificate.cnf
           chdir={{ openvpn_path }}
           creates=server.crt

- name: Generate CSRs for the clients
  command: openssl req -new -key client.key -out client.csr -subj "{{ openssl_request_subject }}/CN={{ item }}"
           chdir={{ openvpn_path }}/{{ item }}
           creates=client.csr
  with_items: openvpn_clients

- name: Generate certificates for the clients
  command: openssl x509 -CA {{ openvpn_ca }}.crt -CAkey {{ openvpn_ca }}.key -CAcreateserial -req -days {{ openvpn_days_valid }} -in client.csr -out client.crt
           chdir={{ openvpn_path }}/{{ item }}
           creates=client.crt
  with_items: openvpn_clients

- name: Generate HMAC firewall key
  command: openvpn --genkey --secret {{ openvpn_hmac_firewall }}
           creates={{ openvpn_hmac_firewall }}

- name: Register CA certificate contents
  command: cat ca.crt
           chdir={{ openvpn_path }}
  register: openvpn_ca_contents

- name: Register client certificate contents
  command: cat client.crt
           chdir={{ openvpn_path }}/{{ item }}
  with_items: openvpn_clients
  register: openvpn_client_certificates

- name: Register client key contents
  command: cat client.key
           chdir={{ openvpn_path }}/{{ item }}
  with_items: openvpn_clients
  register: openvpn_client_keys

- name: Register HMAC firewall contents
  command: cat ta.key
           chdir={{ openvpn_path }}
  register: openvpn_hmac_firewall_contents

- name: Create the client configs
  template: src=client.cnf.j2
            dest={{ openvpn_path }}/{{ item[0] }}/{{ openvpn_server }}.ovpn
  with_together:
    - openvpn_clients
    - openvpn_client_certificates.results
    - openvpn_client_keys.results

- name: Generate Diffie-Hellman parameters (this will take a while)
  command: openssl dhparam -out {{ openvpn_dhparam }} {{ openvpn_key_size }}
           creates={{ openvpn_dhparam }}

- name: Copy rc.local with firewall and dnsmasq rules into place
  template: src=etc_rc.local dest=/etc/rc.local

- name: Enable IPv4 traffic forwarding
  sysctl: name=net.ipv4.ip_forward value=1

- name: Allow OpenVPN through the firewall
  command: "{{ item }}"
  with_items:
    - iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
    - iptables -A FORWARD -s 10.8.0.0/24 -j ACCEPT
    - iptables -A FORWARD -j REJECT
    - iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o {{ ansible_default_ipv4.interface }} -j MASQUERADE

- name: Allow OpenVPN through ufw
  ufw: rule=allow port={{ openvpn_port }} proto={{ openvpn_protocol }}
  tags: ufw

- name: Copy OpenVPN configuration file into place
  template: src=etc_openvpn_server.conf.j2 dest=/etc/openvpn/server.conf
  notify: restart openvpn

# OpenVPN must restart first so the 10.8.0.0 interface is available
# to dnsmasq
- meta: flush_handlers

- name: Copy dnsmasq configuration file into place
  copy: src=etc_dnsmasq.conf dest=/etc/dnsmasq.conf
  notify: restart dnsmasq

- name: Copy OpenVPN PAM configuration file into place
  copy: src=etc_pam.d_openvpn dest=/etc/pam.d/openvpn
  notify: restart openvpn

- name: Copy the ca.crt and ta.key files that clients will need in order to connect to the OpenVPN server
  command: cp {{ openvpn_path }}/{{ item[1] }} {{ openvpn_path }}/{{ item[0] }}
  tags:
    - skip_ansible_lint
  with_nested:
    - openvpn_clients
    - ["ca.crt", "ta.key"]

- name: Retrieve the files that clients will need in order to connect to the OpenVPN server
  fetch: src={{ openvpn_path }}/{{ item[0] }}/{{ item[1] }}
         dest=/tmp/sovereign-openvpn-files
  with_nested:
    - openvpn_clients
    - ["client.crt", "client.key", "ca.crt", "ta.key", "{{ openvpn_server }}.ovpn"]

- pause: seconds=5
         prompt="You are ready to set up your OpenVPN clients. The files that you need are in /tmp/sovereign-openvpn-files. Make sure LZO compression is enabled and that you provide the ta.key file for the TLS-Auth option with a direction of '1'. Press any key to continue..."