From 42220a14f9fb4a6e16a0c00a5839c0a0e831be4d Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Tue, 16 Nov 2021 21:16:00 +0100
Subject: openvpn roles - bas scaffolding and certs

---
 roles/network/openvpn/client/tasks/main.yml |  7 +++
 roles/network/openvpn/client/tasks/tls.yml  | 97 +++++++++++++++++++++++++++++
 2 files changed, 104 insertions(+)
 create mode 100644 roles/network/openvpn/client/tasks/main.yml
 create mode 100644 roles/network/openvpn/client/tasks/tls.yml

(limited to 'roles/network/openvpn/client/tasks')

diff --git a/roles/network/openvpn/client/tasks/main.yml b/roles/network/openvpn/client/tasks/main.yml
new file mode 100644
index 00000000..49f6443f
--- /dev/null
+++ b/roles/network/openvpn/client/tasks/main.yml
@@ -0,0 +1,7 @@
+---
+- name: create TLS certificate and key
+  import_tasks: tls.yml
+
+## TODO:
+## - generate/install openvpn configuration
+## - enable/start "openvpn-server@{{ openvpn_zone.name }}"
diff --git a/roles/network/openvpn/client/tasks/tls.yml b/roles/network/openvpn/client/tasks/tls.yml
new file mode 100644
index 00000000..3c0d9b3f
--- /dev/null
+++ b/roles/network/openvpn/client/tasks/tls.yml
@@ -0,0 +1,97 @@
+---
+- name: install python-cryptography
+  apt:
+    name: "{{ python_basename }}-cryptography"
+    state: present
+
+- name: create base directory
+  file:
+    path: "/etc/ssl/openvpn/{{ openvpn_zone.name }}"
+    state: directory
+
+- name: create client cert/key directory
+  file:
+    path: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/client"
+    state: directory
+    owner: root
+    group: root
+    mode: 0750
+
+- name: create private key for client certificate
+  openssl_privatekey:
+    path: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/client/key.pem"
+    type: RSA
+    size: 4096
+    owner: root
+    group: root
+    mode: 0400
+  notify: restart openvpn-client
+
+- name: create signing request for client certificate
+  openssl_csr:
+    path: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/client/csr.pem"
+    privatekey_path: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/client/key.pem"
+    CN: "{{ inventory_hostname }}"
+    key_usage:
+    - digitalSignature
+    key_usage_critical: yes
+    extended_key_usage:
+    - clientAuth
+    extended_key_usage_critical: yes
+    basic_constraints:
+    - 'CA:FALSE'
+    basic_constraints_critical: yes
+
+- name: slurp CSR
+  slurp:
+    src: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/client/csr.pem"
+  register: openvpn_client_csr
+
+- name: check if client certificate exists
+  stat:
+    path: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/client/crt.pem"
+  register: openvpn_client_cert
+
+- name: read client certificate validity
+  when: openvpn_client_cert.stat.exists
+  openssl_certificate_info:
+    path: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/client/crt.pem"
+    valid_at:
+      ten_years: '+3650d' ## 10 years
+  register: openvpn_client_cert_info
+
+- name: slurp existing client certificate
+  when: openvpn_client_cert.stat.exists
+  slurp:
+    src: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/client/crt.pem"
+  register: openvpn_client_cert_current
+
+- name: generate client certificate
+  delegate_to: "{{ openvpn_zone.ca_host }}"
+  community.crypto.x509_certificate_pipe:
+    content: "{{ openvpn_client_cert_current.content | default('') | b64decode }}"
+    csr_content: "{{ openvpn_client_csr.content | b64decode }}"
+    provider: ownca
+    ownca_path: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/ca-crt.pem"
+    ownca_privatekey_path: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/ca/key.pem"
+    ownca_digest: sha256
+    ownca_not_after: "+18250d" ## 50 years
+    force: "{{ openvpn_client_cert.stat.exists and (not openvpn_client_cert_info.valid_at.ten_years) }}"
+  register: openvpn_client_cert
+
+- name: store client certificate
+  copy:
+    content: "{{ openvpn_client_cert.certificate }}"
+    dest: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/client/crt.pem"
+  notify: restart openvpn-client
+
+- name: slurp CA certificate
+  delegate_to: "{{ openvpn_zone.ca_host }}"
+  slurp:
+    src: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/ca-crt.pem"
+  register: openvpn_client_ca_certificate
+
+- name: install CA certificate
+  copy:
+    content: "{{ openvpn_client_ca_certificate.content | b64decode }}"
+    dest: "/etc/ssl/openvpn/{{ openvpn_zone.name }}/ca-crt.pem"
-- 
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