App Service managed identity disabled

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Metadata

Id: terraform-azure-app-service-managed-identity-disabled

Provider: Azure

Platform: Terraform

Severity: Low

Category: Resource Management

Learn More

Description

Azure App Services should have managed identities enabled to provide secure, automated identity management for accessing Azure resources. Without specifying the identity { type = "SystemAssigned" } block in the Terraform configuration, the service may rely on insecure credential storage or hardcoded secrets, increasing the risk of credential exposure. Enabling managed identity ensures the App Service can securely authenticate to Azure resources without the need to manage credentials manually, reducing the attack surface and enhancing overall security.

resource "azurerm_app_service" "example" {
  // ...other configuration...

  identity {
    type = "SystemAssigned"
  }
}

Compliant Code Examples

resource "azurerm_app_service" "negative1" {
  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

  site_config {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
  }

  app_settings = {
    "SOME_KEY" = "some-value"
  }

  connection_string {
    name  = "Database"
    type  = "SQLServer"
    value = "Server=some-server.mydomain.com;Integrated Security=SSPI"
  }

  identity {
    type = "SystemAssigned"
  }
}

Non-Compliant Code Examples

resource "azurerm_app_service" "positive1" {
  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

  site_config {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
  }

  app_settings = {
    "SOME_KEY" = "some-value"
  }

  connection_string {
    name  = "Database"
    type  = "SQLServer"
    value = "Server=some-server.mydomain.com;Integrated Security=SSPI"
  }
}