terraform.azure.security.appservice.azure-appservice-auth.azure-appservice-auth

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LGPL Commons Clause
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Ensure App Service Authentication is set on Azure App Service

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Defintion

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rules:
  - id: azure-appservice-auth
    message: Ensure App Service Authentication is set on Azure App Service
    patterns:
      - pattern: resource
      - pattern-not-inside: |
          resource "azurerm_app_service" "..." {
          ...
          auth_settings {
            ...
            enabled = true
            ...
          }
          ...
          }
      - pattern-inside: |
          resource "azurerm_app_service" "..." {
          ...
          }
    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
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Improper Authorization
    languages:
      - hcl
    severity: WARNING

Examples

azure-appservice-auth.tf

# fail
# ruleid: azure-appservice-auth
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

  auth_settings {
    enabled                       = true
    issuer                        = "https://sts.windows.net/d13958f6-b541-4dad-97b9-5a39c6b01297"
    default_provider              = "AzureActiveDirectory"
    unauthenticated_client_action = "RedirectToLoginPage"
  }
}