# Source: https://docs.datadoghq.com/security/code_security/iac_security/iac_rules/terraform/azure/azure_app_service_client_certificate_disabled.md

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

# Azure App Service client certificate disabled

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

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

{% /callout %}

## Metadata{% #metadata %}

**Id:** `a81573f9-3691-4d83-88a0-7d4af63e17a3`

**Cloud Provider:** Azure

**Platform:** Terraform

**Severity:** Medium

**Category:** Insecure Configurations

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

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

### Description{% #description %}

Enabling client certificates for Azure App Service ensures that only authenticated clients can access the application by requiring a client SSL certificate in all HTTPS requests. If the `client_cert_enabled` attribute is not set to `true`, unauthorized users could potentially connect to the service, increasing the risk of data leaks or abuse. To secure the App Service, always configure the resource as follows:

```
resource "azurerm_app_service" "example" {
  // ... other configuration ...
  client_cert_enabled = true
}
```

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

```terraform
resource "azurerm_app_service" "negative" {
  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"
  }

  client_cert_enabled = true

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

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

```terraform
resource "azurerm_app_service" "positive2" {
  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"
  }

  client_cert_enabled = false

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

```terraform
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"
  }
}
```