Add TLS support to zun backends

By overriding the variable `zun_backend_ssl: True` HTTPS will
be enabled, disabling HTTP support on the zun backend api.

The ansible-role-pki is used to generate the required TLS
certificates if this functionality is enabled.

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/879085
Change-Id: I85f90c573007f422b004b41e785bd1c86a21ec92

defaults/main.yml

@@ -284,6 +284,7 @@ zun_services:
     uwsgi_overrides: "{{ zun_uwsgi_conf_overrides }}"
     uwsgi_uid: "{{ zun_system_user_name }}"
     uwsgi_guid: "{{ zun_system_group_name }}"
+    uwsgi_tls: "{{ zun_backend_ssl | ternary(zun_uwsgi_tls, {}) }}"
   zun-compute:
     group: zun_compute
     service_name: zun-compute
@@ -351,6 +352,9 @@ zun_uwsgi_conf_overrides: {}
 zun_kuryr_uwsgi_conf_overrides:
   uwsgi:
     pyargv: --config-file /etc/kuryr/kuryr.conf
+zun_uwsgi_tls:
+  crt: "{{ zun_ssl_cert }}"
+  key: "{{ zun_ssl_key }}"
 
 ## Default zun+kuryr options used within the systemd unit file.
 zun_kuryr_init_defaults:
@@ -380,3 +384,51 @@ zun_kuryr_init_overrides: {}
 zun_docker_init_overrides: {}
 zun_docker_cleanup_init_overrides: {}
 zun_policy_overrides: {}
+
+###
+### Backend TLS
+###
+
+# Define if communication between haproxy and service backends should be
+# encrypted with TLS.
+zun_backend_ssl: "{{ openstack_service_backend_ssl | default(False) }}"
+
+# Storage location for SSL certificate authority
+zun_pki_dir: "{{ openstack_pki_dir | default('/etc/openstack_deploy/pki') }}"
+
+# Delegated host for operating the certificate authority
+zun_pki_setup_host: "{{ openstack_pki_setup_host | default('localhost') }}"
+
+# zun server certificate
+zun_pki_keys_path: "{{ zun_pki_dir ~ '/certs/private/' }}"
+zun_pki_certs_path: "{{ zun_pki_dir ~ '/certs/certs/' }}"
+zun_pki_intermediate_cert_name: "{{ openstack_pki_service_intermediate_cert_name | default('ExampleCorpIntermediate') }}"
+zun_pki_regen_cert: ''
+zun_pki_san: "{{ openstack_pki_san | default('DNS:' ~ ansible_facts['hostname'] ~ ',IP:' ~ management_address) }}"
+zun_pki_certificates:
+  - name: "zun_{{ ansible_facts['hostname'] }}"
+    provider: ownca
+    cn: "{{ ansible_facts['hostname'] }}"
+    san: "{{ zun_pki_san }}"
+    signed_by: "{{ zun_pki_intermediate_cert_name }}"
+
+# zun destination files for SSL certificates
+zun_ssl_cert: /etc/zun/zun.pem
+zun_ssl_key: /etc/zun/zun.key
+
+# Installation details for SSL certificates
+zun_pki_install_certificates:
+  - src: "{{ zun_user_ssl_cert | default(zun_pki_certs_path ~ 'zun_' ~ ansible_facts['hostname'] ~ '-chain.crt') }}"
+    dest: "{{ zun_ssl_cert }}"
+    owner: "{{ zun_system_user_name }}"
+    group: "{{ zun_system_user_name }}"
+    mode: "0644"
+  - src: "{{ zun_user_ssl_key | default(zun_pki_keys_path ~ 'zun_' ~ ansible_facts['hostname'] ~ '.key.pem') }}"
+    dest: "{{ zun_ssl_key }}"
+    owner: "{{ zun_system_user_name }}"
+    group: "{{ zun_system_user_name }}"
+    mode: "0600"
+
+# Define user-provided SSL certificates
+#zun_user_ssl_cert: <path to cert on ansible deployment host>
+#zun_user_ssl_key: <path to cert on ansible deployment host>

handlers/main.yml

@@ -82,6 +82,7 @@
     - "Restart zun services"
     - "venv changed"
     - "systemd service changed"
+    - "cert installed"
 
 - name: Start services
   systemd:
@@ -98,3 +99,4 @@
     - "Restart zun services"
     - "venv changed"
     - "systemd service changed"
+    - "cert installed"

tasks/main.yml

@@ -33,6 +33,26 @@
   tags:
     - zun-install
 
+- name: Create and install SSL certificates
+  include_role:
+    name: pki
+    tasks_from: main_certs.yml
+    apply:
+      tags:
+        - zun-config
+        - pki
+  vars:
+    pki_setup_host: "{{ zun_pki_setup_host }}"
+    pki_dir: "{{ zun_pki_dir }}"
+    pki_create_certificates: "{{ zun_user_ssl_cert is not defined and zun_user_ssl_key is not defined }}"
+    pki_regen_cert: "{{ zun_pki_regen_cert }}"
+    pki_certificates: "{{ zun_pki_certificates }}"
+    pki_install_certificates: "{{ zun_pki_install_certificates }}"
+  when:
+    - zun_backend_ssl
+  tags:
+    - always
+
 # NOTE(jrosser)
 # kuryr-lib appears in u-c and the new pip resolver will fail to install
 # if two contradictory constraints are given which will always happen