terraform.azure.security.appservice.azure-appservice-client-certificate.azure-appservice-client-certificate

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LGPL Commons Clause
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Ensure the web app has Client Certificates

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Defintion

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rules:
  - id: azure-appservice-client-certificate
    message: Ensure the web app has Client Certificates
    patterns:
      - pattern: resource
      - pattern-not-inside: |
          resource "azurerm_app_service" "..." {
          ...
          client_cert_enabled = true
          ...
          }
      - pattern-inside: |
          resource "azurerm_app_service" "..." {
          ...
          }
    metadata:
      owasp:
        - A03:2017 - Sensitive Data Exposure
        - A02:2021 - Cryptographic Failures
      cwe:
        - "CWE-326: Inadequate Encryption Strength"
      category: security
      technology:
        - terraform
        - azure
      references:
        - https://owasp.org/Top10/A02_2021-Cryptographic_Failures
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Cryptographic Issues
    languages:
      - hcl
    severity: WARNING

Examples

azure-appservice-client-certificate.tf

# fail
# ruleid: azure-appservice-client-certificate
resource "azurerm_app_service" "example" {
    name                = "example-app-service"
    location            = azurerm_resource_group.example.location
    resource_group_name = azurerm_resource_group.example.name
    app_service_plan_id = azurerm_app_service_plan.example.id
}

# pass
resource "azurerm_app_service" "example" {
    name                = "example-app-service"
    location            = azurerm_resource_group.example.location
    resource_group_name = azurerm_resource_group.example.name
    app_service_plan_id = azurerm_app_service_plan.example.id
    client_cert_enabled          = true
}