rules:
- id: gcp-gke-basic-auth
  patterns:
  - pattern: resource
  - pattern-inside: |
      resource "google_container_cluster" "..." {
      ...
      }
  - pattern-not-inside: |
      resource "google_container_cluster" "..." {
      ...
      master_auth {
        client_certificate_config {
          ...
        }
      }
      ...
      }
  - pattern-not-inside: |
      resource "google_container_cluster" "..." {
      ...
      master_auth {
        ...
        username = ""
        password = ""
        ...
      }
      ...
      }
  message: >-
    Ensure GKE basic auth is disabled	
  metadata:
    owasp:
    - A05:2017 - Broken Access Control
    - A01:2021 - Broken Access Control
    cwe:
    - 'CWE-284: Improper Access Control'
    category: security
    technology:
    - terraform
    - gcp
    references:
    - https://owasp.org/Top10/A01_2021-Broken_Access_Control
    subcategory:
    - audit
    likelihood: LOW
    impact: LOW
    confidence: LOW
  languages: [hcl]
  severity: WARNING