rules:
- id: azure-vmencryption-at-host-enabled
  message: >-
    Ensure that Virtual machine scale sets have encryption at host enabled
  patterns:
  - pattern: resource
  - pattern-either:
    - pattern-inside: |
        resource "azurerm_windows_virtual_machine_scale_set" "..." {
        ...
        }
    - pattern-inside: |
        resource "azurerm_linux_virtual_machine_scale_set" "..." {
        ...
        }
  - pattern-not-inside: |
      resource "azurerm_windows_virtual_machine_scale_set" "..." {
      ...
      encryption_at_host_enabled = true
      ...
      }
  - pattern-not-inside: |
      resource "azurerm_linux_virtual_machine_scale_set" "..." {
      ...
      encryption_at_host_enabled = true
      ...
      }
  metadata:
    owasp:
    - A03:2017 - Sensitive Data Exposure
    cwe:
    - 'CWE-320: CWE CATEGORY: Key Management Errors'
    category: security
    technology:
    - terraform
    - azure
    references:
    - https://owasp.org/Top10/A02_2021-Cryptographic_Failures
    subcategory:
    - audit
    likelihood: LOW
    impact: LOW
    confidence: LOW
  languages: [hcl]
  severity: WARNING