kubespray/roles/kubernetes-apps/rotate_tokens/tasks/main.yml

---
- name: Rotate Tokens | Get default token name
  shell: "{{ bin_dir }}/kubectl --kubeconfig /etc/kubernetes/admin.conf get secrets -o custom-columns=name:{.metadata.name} --no-headers | grep -m1 default-token"
  register: default_token
  changed_when: false
  until: default_token.rc == 0
  delay: 1
  retries: 5

- name: Rotate Tokens | Get default token data
  command: "{{ bin_dir }}/kubectl --kubeconfig /etc/kubernetes/admin.conf get secrets {{ default_token.stdout }} -ojson"
  register: default_token_data
  changed_when: false

- name: Rotate Tokens | Test if default certificate is expired
  uri:
    url: https://{{ kube_apiserver_ip }}/api/v1/nodes
    method: GET
    return_content: no
    validate_certs: no
    headers:
      Authorization: "Bearer {{ (default_token_data.stdout|from_json)['data']['token']|b64decode }}"
  register: check_secret
  failed_when: false

- name: Rotate Tokens | Determine if certificate is expired
  set_fact:
    needs_rotation: '{{ check_secret.status not in [200, 403] }}'

# FIXME(mattymo): Exclude built in secrets that were automatically rotated,
# instead of filtering manually
- name: Rotate Tokens | Get all serviceaccount tokens to expire
  shell: >-
    {{ bin_dir }}/kubectl --kubeconfig /etc/kubernetes/admin.conf get secrets --all-namespaces
    -o 'jsonpath={range .items[*]}{"\n"}{.metadata.namespace}{" "}{.metadata.name}{" "}{.type}{end}'
    | grep kubernetes.io/service-account-token
    | egrep 'default-token|kube-proxy|coredns|netchecker|weave|calico|canal|flannel|dashboard|cluster-proportional-autoscaler|tiller|local-volume-provisioner'
  register: tokens_to_delete
  when: needs_rotation

- name: Rotate Tokens | Delete expired tokens
  command: "{{ bin_dir }}/kubectl --kubeconfig /etc/kubernetes/admin.conf delete secrets -n {{ item.split(' ')[0] }} {{ item.split(' ')[1] }}"
  with_items: "{{ tokens_to_delete.stdout_lines }}"
  when: needs_rotation

- name: Rotate Tokens | Delete pods in system namespace
  command: "{{ bin_dir }}/kubectl --kubeconfig /etc/kubernetes/admin.conf delete pods -n kube-system --all --grace-period=0 --force"
  when: needs_rotation