App Service FTPS enforce disabled

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Metadata

Id: terraform-azure-app-service-ftps-enforce-disabled

Provider: Azure

Platform: Terraform

Severity: Medium

Category: Insecure Configurations

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Description

App Service FTPS enforcement should be configured by setting the ftps_state attribute to "FtpsOnly" in the site_config block for the azurerm_app_service resource. Allowing "AllAllowed" in this setting permits both unencrypted FTP and encrypted FTPS connections, exposing sensitive data to potential interception or tampering during transit. To ensure data confidentiality and compliance, always use:

ftps_state = "FtpsOnly"

This setting enforces encrypted connections to the Azure App Service.

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"
    ftps_state = "FtpsOnly"
  }
}

resource "azurerm_app_service" "negative2" {
  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"
    ftps_state = "Disabled"
  }
}

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"
    ftps_state = "AllAllowed"
  }
}