---
title: Function App authentication disabled
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: >-
  Docs > Datadog Security > Code Security > Infrastructure as Code (IaC)
  Security > IaC Security Rules > Function App authentication disabled
---

> For the complete documentation index, see [llms.txt](https://docs.datadoghq.com/llms.txt).

# Function App authentication disabled

{% callout %}
# Important note for users on the following Datadog sites: app.ddog-gov.com, us2.ddog-gov.com

{% alert level="danger" %}
This product is not supported for your selected [Datadog site](https://docs.datadoghq.com/getting_started/site.md). ({% placeholder "user-datadog-site-name" /%}).
{% /alert %}

{% /callout %}

## Metadata{% #metadata %}

**Id:** `terraform-azure-function-app-authentication-disabled` 

**Provider:** Azure

**Platform:** Terraform

**Severity:** Medium

**Category:** Access Control

#### Learn More{% #learn-more %}

- [Provider Reference](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/function_app#auth_settings)

### Description{% #description %}

Azure Function App authentication settings should be enabled to ensure that only authorized users and services can access the deployed function endpoints. Leaving authentication (`auth_settings { enabled = true }`) disabled, as shown below, permits unauthenticated, potentially malicious access to the function app, increasing the risk of data exposure or unauthorized actions:

```
resource "azurerm_function_app" "example" {
  // ...other config...
  auth_settings {
    enabled = true
  }
}
```

Enabling authentication protects sensitive operations and helps prevent unauthorized or anonymous interaction with serverless workloads.

## Compliant Code Examples{% #compliant-code-examples %}

```terraform
resource "azurerm_function_app" "negative" {
  name                       = "test-azure-functions"
  location                   = azurerm_resource_group.example.location
  resource_group_name        = azurerm_resource_group.example.name
  app_service_plan_id        = azurerm_app_service_plan.example.id
  storage_account_name       = azurerm_storage_account.example.name
  storage_account_access_key = azurerm_storage_account.example.primary_access_key

   auth_settings {
    enabled = true
  }
}
```

```terraform
resource "azurerm_resource_group" "example" {
  name     = "test-rg"
  location = "eastus"
}

resource "azurerm_storage_account" "example" {
  name                     = "testazurefunctionssa"
  resource_group_name      = azurerm_resource_group.example.name
  location                 = azurerm_resource_group.example.location
  account_tier             = "Standard"
  account_replication_type = "LRS"
}

resource "azurerm_service_plan" "example" {
  name                = "test-service-plan"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location
  os_type             = "Windows"
  sku_name            = "Y1"
}

resource "azurerm_windows_function_app" "negative2" {
  name                       = "test-azure-functions-v2"
  location                   = azurerm_resource_group.example.location
  resource_group_name        = azurerm_resource_group.example.name
  service_plan_id            = azurerm_service_plan.example.id
  storage_account_name       = azurerm_storage_account.example.name
  storage_account_access_key = azurerm_storage_account.example.primary_access_key

  site_config {}

  auth_settings_v2 {
    auth_enabled = true

    login {}

    active_directory_v2 {
      client_id                  = "00000000-0000-0000-0000-000000000000"
      tenant_auth_endpoint       = "https://login.microsoftonline.com/00000000-0000-0000-0000-000000000000/v2.0"
    }
  }
}
```

## Non-Compliant Code Examples{% #non-compliant-code-examples %}

```terraform
resource "azurerm_function_app" "positive1" {
  name                       = "test-azure-functions"
  location                   = azurerm_resource_group.example.location
  resource_group_name        = azurerm_resource_group.example.name
  app_service_plan_id        = azurerm_app_service_plan.example.id
  storage_account_name       = azurerm_storage_account.example.name
  storage_account_access_key = azurerm_storage_account.example.primary_access_key
}
```

```terraform
resource "azurerm_function_app" "positive2" {
  name                       = "test-azure-functions"
  location                   = azurerm_resource_group.example.location
  resource_group_name        = azurerm_resource_group.example.name
  app_service_plan_id        = azurerm_app_service_plan.example.id
  storage_account_name       = azurerm_storage_account.example.name
  storage_account_access_key = azurerm_storage_account.example.primary_access_key

   auth_settings {
    enabled = false
  }
}
```