kubespray/roles/kubernetes/secrets/tasks/gen_certs_script.yml

---
- name: "Gen_certs | Create kubernetes config directory (on {{groups['kube-master'][0]}})"
  file:
    path: "{{ kube_config_dir }}"
    state: directory
    owner: kube
  run_once: yes
  delegate_to: "{{groups['kube-master'][0]}}"
  when: gen_certs|default(false)
  tags:
    - kubelet
    - k8s-secrets
    - kube-controller-manager
    - kube-apiserver
    - apps
    - network
    - master
    - node

- name: "Gen_certs | Create kubernetes script directory (on {{groups['kube-master'][0]}})"
  file:
    path: "{{ kube_script_dir }}"
    state: directory
    owner: kube
  run_once: yes
  delegate_to: "{{groups['kube-master'][0]}}"
  when: gen_certs|default(false)
  tags:
    - k8s-secrets

- name: Gen_certs | write openssl config
  template:
    src: "openssl.conf.j2"
    dest: "{{ kube_config_dir }}/openssl.conf"
  run_once: yes
  delegate_to: "{{groups['kube-master'][0]}}"
  when: gen_certs|default(false)

- name: Gen_certs | copy certs generation script
  template:
    src: "make-ssl.sh.j2"
    dest: "{{ kube_script_dir }}/make-ssl.sh"
    mode: 0700
  run_once: yes
  delegate_to: "{{groups['kube-master'][0]}}"
  when: gen_certs|default(false)

- name: Gen_certs | run cert generation script
  command: "{{ kube_script_dir }}/make-ssl.sh -f {{ kube_config_dir }}/openssl.conf -d {{ kube_cert_dir }}"
  environment:
    - MASTERS: "{% for m in groups['kube-master'] %}
                  {% if gen_master_certs|default(false) %}
                    {{ m }}
                  {% endif %}
                {% endfor %}"
    - HOSTS: "{% for h in groups['k8s-cluster'] %}
                {% if gen_node_certs[h]|default(true) %}
                    {{ h }}
                {% endif %}
              {% endfor %}"
  run_once: yes
  delegate_to: "{{groups['kube-master'][0]}}"
  when: gen_certs|default(false)
  notify: set secret_changed

- set_fact:
    all_master_certs: "['ca-key.pem',
                       'apiserver.pem',
                       'apiserver-key.pem',
                       'kube-scheduler.pem',
                       'kube-scheduler-key.pem',
                       'kube-controller-manager.pem',
                       'kube-controller-manager-key.pem',
                       'front-proxy-ca.pem',
                       'front-proxy-ca-key.pem',
                       'front-proxy-client.pem',
                       'front-proxy-client-key.pem',
                       'service-account-key.pem',
                       {% for node in groups['kube-master'] %}
                       'admin-{{ node }}.pem',
                       'admin-{{ node }}-key.pem',
                      {% endfor %}]"
    my_master_certs: ['ca-key.pem',
                      'admin-{{ inventory_hostname }}.pem',
                      'admin-{{ inventory_hostname }}-key.pem',
                      'apiserver.pem',
                      'apiserver-key.pem',
                      'front-proxy-ca.pem',
                      'front-proxy-ca-key.pem',
                      'front-proxy-client.pem',
                      'front-proxy-client-key.pem',
                      'service-account-key.pem',
                      'kube-scheduler.pem',
                      'kube-scheduler-key.pem',
                      'kube-controller-manager.pem',
                      'kube-controller-manager-key.pem']
    all_node_certs: "['ca.pem',
                    {% for node in groups['k8s-cluster'] %}
                    'node-{{ node }}.pem',
                    'node-{{ node }}-key.pem',
                    'kube-proxy-{{ node }}.pem',
                    'kube-proxy-{{ node }}-key.pem',
                    {% endfor %}]"
    my_node_certs: ['ca.pem',
                    'node-{{ inventory_hostname }}.pem',
                    'node-{{ inventory_hostname }}-key.pem',
                    'kube-proxy-{{ inventory_hostname }}.pem',
                    'kube-proxy-{{ inventory_hostname }}-key.pem']
  tags:
    - facts

- name: "Check certs | check if a cert already exists on node"
  find:
    paths: "{{ kube_cert_dir }}"
    patterns: "*.pem"
    get_checksum: true
  register: kubecert_node
  when: inventory_hostname != groups['kube-master'][0]

- name: "Check_certs | Set 'sync_certs' to true on masters"
  set_fact:
    sync_certs: true
  when: inventory_hostname in groups['kube-master'] and
        inventory_hostname != groups['kube-master'][0] and
        (not item in kubecert_node.files | map(attribute='path') | map("basename") | list or
        kubecert_node.files | selectattr("path", "equalto", '%s/%s'|format(kube_cert_dir, item)) | map(attribute="checksum")|first|default('') != kubecert_master.files | selectattr("path", "equalto", '%s/%s'|format(kube_cert_dir, item)) | map(attribute="checksum")|first|default(''))
  with_items:
    - "{{ my_master_certs + all_node_certs }}"

- name: "Check_certs | Set 'sync_certs' to true on nodes"
  set_fact:
    sync_certs: true
  when: inventory_hostname in groups['kube-node'] and
        inventory_hostname != groups['kube-master'][0] and
        (not item in kubecert_node.files | map(attribute='path') | map("basename") | list or
        kubecert_node.files | selectattr("path", "equalto", '%s/%s'|format(kube_cert_dir, item)) | map(attribute="checksum")|first|default('') != kubecert_master.files | selectattr("path", "equalto", '%s/%s'|format(kube_cert_dir, item)) | map(attribute="checksum")|first|default(''))
  with_items:
    - "{{ my_node_certs }}"

- name: Gen_certs | Gather master certs
  shell: "tar cfz - -C {{ kube_cert_dir }} -T /dev/stdin <<< {{ my_master_certs|join(' ') }} {{ all_node_certs|join(' ') }} | base64 --wrap=0"
  args:
    executable: /bin/bash
  no_log: true
  register: master_cert_data
  check_mode: no
  delegate_to: "{{groups['kube-master'][0]}}"
  when: inventory_hostname in groups['kube-master'] and sync_certs|default(false) and
        inventory_hostname != groups['kube-master'][0]

- name: Gen_certs | Gather node certs
  shell: "tar cfz - -C {{ kube_cert_dir }} -T /dev/stdin <<< {{ my_node_certs|join(' ') }} | base64 --wrap=0"
  args:
    executable: /bin/bash
  no_log: true
  register: node_cert_data
  check_mode: no
  delegate_to: "{{groups['kube-master'][0]}}"
  when: inventory_hostname in groups['kube-node'] and
        sync_certs|default(false) and
        inventory_hostname != groups['kube-master'][0]

# NOTE(mattymo): Use temporary file to copy master certs because we have a ~200k
# char limit when using shell command

# FIXME(mattymo): Use tempfile module in ansible 2.3
- name: Gen_certs | Prepare tempfile for unpacking certs on masters
  command: mktemp /tmp/certsXXXXX.tar.gz
  register: cert_tempfile
  when: inventory_hostname in groups['kube-master'] and sync_certs|default(false) and
        inventory_hostname != groups['kube-master'][0]

- name: Gen_certs | Write master certs to tempfile
  copy:
    content: "{{master_cert_data.stdout}}"
    dest: "{{cert_tempfile.stdout}}"
    owner: root
    mode: "0600"
  when: inventory_hostname in groups['kube-master'] and sync_certs|default(false) and
        inventory_hostname != groups['kube-master'][0]

- name: Gen_certs | Unpack certs on masters
  shell: "base64 -d < {{ cert_tempfile.stdout }} | tar xz -C {{ kube_cert_dir }}"
  no_log: true
  changed_when: false
  check_mode: no
  when: inventory_hostname in groups['kube-master'] and sync_certs|default(false) and
        inventory_hostname != groups['kube-master'][0]
  notify: set secret_changed

- name: Gen_certs | Cleanup tempfile on masters
  file:
    path: "{{cert_tempfile.stdout}}"
    state: absent
  when: inventory_hostname in groups['kube-master'] and sync_certs|default(false) and
        inventory_hostname != groups['kube-master'][0]

- name: Gen_certs | Copy certs on nodes
  shell: "base64 -d <<< '{{node_cert_data.stdout|quote}}' | tar xz -C {{ kube_cert_dir }}"
  args:
    executable: /bin/bash
  no_log: true
  changed_when: false
  check_mode: no
  when: inventory_hostname in groups['kube-node'] and
        sync_certs|default(false) and
        inventory_hostname != groups['kube-master'][0]
  notify: set secret_changed

- name: Gen_certs | check certificate permissions
  file:
    path: "{{ kube_cert_dir }}"
    group: "{{ kube_cert_group }}"
    state: directory
    owner: kube
    mode: "u=rwX,g-rwx,o-rwx"
    recurse: yes