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Showing content from https://github.com/Azure-Samples/function-app-with-private-http-endpoint below:

Azure-Samples/function-app-with-private-http-endpoint: Access HTTP/S endpoint(s) of an Azure Function exclusively via a private endpoint.

Private endpoints for Azure Functions enable access to a Function App within a specified virtual network and restrict public internet access to it. Only clients which are connected to the virtual network are able to access the Function App. HTTP requests that originate from outside the virtual network address space are unable to reach the Function App.

This project framework provides the following features:

• A Function App with a basic .NET HTTP triggered Azure Function.
• An Azure Virtual Network, Private Endpoint, and related resources that restrict access to the Function App.
• An Azure Key Vault instance used to securely store all secret values.
• Private Endpoints and network access controls that restrict access to the Storage Account and Key Vault.
• All components are deployable via Bicep or Terraform.

• Azure CLI (2.42.0)
• Azure Functions Core Tools
• .NET
• Bicep or Terraform

The project can be deployed using either Bicep or Terraform.

1. Create a new Azure resource group to deploy the Bicep template to, passing in a location and name - az group create --location <LOCATION> --name <RESOURCE_GROUP_NAME>
2. The azuredeploy.parameters.json file contains the necessary variables to deploy the Bicep project. Update the file with appropriate values. Descriptions for each parameter can be found in the main.bicep file.
3. Optionally, verify what Bicep will deploy, passing in the name of the resource group created earlier and the necessary parameters for the Bicep template - az deployment group what-if --resource-group <RESOURCE_GROUP_NAME> --template-file .\main.bicep --parameters .\azuredeploy.parameters.json
4. Deploy the template, passing in the name of the resource group created earlier and the necessary parameters for the Bicep template - az deployment group create --resource-group <RESOURCE_GROUP_NAME> --template-file .\main.bicep --parameters .\azuredeploy.parameters.json

1. The terraform.tfvars file contains the necessary variables to apply the Terraform configuration. Update the file with appropriate values. Descriptions for each variable can be found in the variables.tf file.
2. Initialize Terraform - terraform init
3. Optionally, verify what Terraform will deploy - terraform plan
4. Deploy the configuration - terraform apply

Enabling Private Endpoints on a Function App also makes the Source Control Manager (SCM) site publicly inaccessible. As a result, publishing code from a local machine via the SCM endpoint is not possible as the endpoint is restricted for use from within the virtual network. The project is equipped with a script that utilizes zip deploy for Azure Functions for quick, local deployment purposes. The script deploys a separate Azure Storage account, zips up the Function App source code and pushes it to an Azure Storage container, and adds the WEBSITE_RUN_FROM_PACKAGE application setting to the Function App that points to the zip file. In an environment with dedicated pipelines, use self-hosted agents that are deployed into a subnet on the virtual network.

1. Navigate to the ./scripts directory.
2. Deploy the code to the function app provisioned by Bicep or Terraform - ./deploy-azure-functions-code.sh <SUBSCRIPTION_ID> <RESOURCE_GROUP_NAME> <FUNCTION_APP_NAME>

Note: The script pulls and assigns the Azure Region's name (e.g. eastus2) to the LOCATION variable. LOCATION may need to be set to the Azure Region's display name (e.g. East US 2) when run from certain programs. The script also assumes the zip package is installed on the local machine.

1. Open Powershell on the local machine.
2. Make a GET request to the HTTP triggered Azure Function - curl https://<FUNCTION_APP_NAME>.azurewebsites.net/api/HttpRequestProcessor
3. Observe a DNS error.
4. Navigate to the Azure Portal and find the Virtual Machine that was provisioned.
5. Open the Connect blade and select Bastion.
6. Input the admin username and password used in the infrastructure deployment and Connect.
7. Open Powershell in the Bastion window.
8. Make a GET request to the HTTP triggered Azure Function - curl https://<FUNCTION_APP_NAME>.azurewebsites.net/api/HttpRequestProcessor
9. Observe a 200 response.

• Tutorial: Integrate Azure Functions with an Azure virtual network by using private endpoints
• Integrate your app with an Azure virtual network
• Azure Functions networking options
• Configure Azure Storage firewalls and virtual networks
• Configure Azure Key Vault firewalls and virtual networks
• Deployment technologies in Azure Functions
• Run a self-hosted agent in Docker

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