Client certificate disabled

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Metadata

Id: 20180133-a0d0-4745-bfe0-94049fbb12a9

Cloud Provider: GCP

Platform: Ansible

Severity: High

Category: Insecure Configurations

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Description

Client certificate authentication for the Kubernetes control plane ensures administrators authenticate with strong cryptographic credentials, reducing reliance on weaker or shared credentials that can lead to unauthorized control-plane access.

For Ansible GCP Container Cluster resources (google.cloud.gcp_container_cluster and gcp_container_cluster), the master_auth object must include client_certificate_config with issue_client_certificate: true. Resources that omit master_auth, omit client_certificate_config, or set issue_client_certificate to false are flagged.

Secure configuration example for an Ansible task:

- name: Create GKE cluster with client certificate enabled
  google.cloud.gcp_container_cluster:
    name: my-cluster
    master_auth:
      client_certificate_config:
        issue_client_certificate: true

Compliant Code Examples

#this code is a correct code for which the query should not find any result
- name: create a cluster
  google.cloud.gcp_container_cluster:
    name: my-cluster
    initial_node_count: 2
    master_auth:
      username: cluster_admin
      password: my-secret-password
      client_certificate_config:
        issue_client_certificate: yes
    node_config:
      machine_type: n1-standard-4
      disk_size_gb: 500
    location: us-central1-a
    project: test_project
    auth_kind: serviceaccount
    service_account_file: /tmp/auth.pem
    state: present

Non-Compliant Code Examples

#this is a problematic code where the query should report a result(s)
- name: create a cluster1
  google.cloud.gcp_container_cluster:
    name: my-cluster1
    initial_node_count: 2
    node_config:
      machine_type: n1-standard-4
      disk_size_gb: 500
    location: us-central1-a
    project: test_project
    auth_kind: serviceaccount
    service_account_file: "/tmp/auth.pem"
    state: present
- name: create a cluster2
  google.cloud.gcp_container_cluster:
    name: my-cluster2
    initial_node_count: 2
    master_auth:
      username: cluster_admin
      password: my-secret-password
    node_config:
      machine_type: n1-standard-4
      disk_size_gb: 500
    location: us-central1-a
    project: test_project
    auth_kind: serviceaccount
    service_account_file: "/tmp/auth.pem"
    state: present
- name: create a cluster3
  google.cloud.gcp_container_cluster:
    name: my-cluster3
    initial_node_count: 2
    master_auth:
      username: cluster_admin
      password: my-secret-password
      client_certificate_config:
        issue_client_certificate: no
    node_config:
      machine_type: n1-standard-4
      disk_size_gb: 500
    location: us-central1-a
    project: test_project
    auth_kind: serviceaccount
    service_account_file: "/tmp/auth.pem"
    state: present