rules:
- id: azure-instance-extensions
  message: >-
    Ensure Virtual Machine Extensions are not Installed
  patterns:
  - pattern: resource
  - pattern-either:
    - pattern-inside: |
        resource "azurerm_linux_virtual_machine" "..." {
        ...
        }
    - pattern-inside: |
        resource "azurerm_windows_virtual_machine" "..." {
        ...
        }
  - pattern-not-inside: |
      resource "azurerm_linux_virtual_machine" "..." {
      ...
      allow_extension_operations = false
      ...
      }
  - pattern-not-inside: |
      resource "azurerm_windows_virtual_machine" "..." {
      ...
      allow_extension_operations = false
      ...
      }
  metadata:
    owasp:
    - A05:2017 - Broken Access Control
    - A01:2021 - Broken Access Control
    cwe:
    - 'CWE-284: Improper Access Control'
    category: security
    technology:
    - terraform
    - azure
    references:
    - https://owasp.org/Top10/A01_2021-Broken_Access_Control
    subcategory:
    - audit
    likelihood: LOW
    impact: LOW
    confidence: LOW
  languages: [hcl]
  severity: WARNING