rules:
- id: appservice-require-client-cert
  message: >-
    Detected an AppService that was not configured to use a client certificate. Add `client_cert_enabled
    = true`
    in your resource block.
  patterns:
  - pattern: resource
  - pattern-not-inside: |
      resource "azurerm_app_service" "..." {
      ...
        client_cert_enabled = true
      ...
      }
  - pattern-either:
    - pattern-inside: |
        resource "azurerm_app_service" "..." {
        ...
        }
    - pattern-inside: |
        resource "azurerm_app_service" "..." {
        ...
          client_cert_enabled = false
        ...
        }
  metadata:
    cwe:
    - 'CWE-295: Improper Certificate Validation'
    category: security
    technology:
    - terraform
    - azure
    references:
    - https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/app_service#client_cert_enabled
    owasp:
    - A03:2017 - Sensitive Data Exposure
    - A07:2021 - Identification and Authentication Failures
    subcategory:
    - vuln
    likelihood: MEDIUM
    impact: MEDIUM
    confidence: MEDIUM
  languages: [hcl]
  severity: INFO