rules:
- id: gcp-pubsub-private-topic-iam-binding
  patterns:
  - pattern: resource
  - pattern-either:
    - pattern-inside: |
        resource "google_pubsub_topic_iam_binding" "..." {
        ...
        members = [ ..., "allAuthenticatedUsers", ...]
        ...
        }
    - pattern-inside: |
        resource "google_pubsub_topic_iam_binding" "..." {
        ...
        members = [ ..., "allUsers", ...]
        ...
        }
  message: >-
    Ensure that Pub/Sub Topics are not anonymously or publicly accessible
  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