This will open a series of blades which guides you through the process. This articles describes how we can secure an Azure Function API by an authentication token. I will give step by step detailed demonstration by creating a Azure Function app from scratch and configuring/coding to secure the Azure Function API. Then we need to add the “authentication boilerplate code” to every function, we want to protect with JWT access tokens. Create a new Function app Create Function app in Azure Portal. With Easy Auth the authentication will be handled by Azure App Service it self and works basically in two ways (at least when configured with Azure AD, I haven’t tried other login providers). Please note down the secret in a secured location for future reference. It does not have to be like this. As we have now configured our Function App to be authenticated by Azure AD , same request in Postman will not give desired output & instead will return redirect page (as shown below). Azure Functions Process events with serverless code; ... Linux apps can have the same great experience of turnkey service-to-service authentication without having to manage any credentials. This approach minimises any boiler plate and makes the validation of access tokens an external concern. Additional Triggers to choose, access rights & Storage account. public static async Task Run( [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest httpRequest, ILogger logger, ClaimsPrincipal claimsPrincipal) { // … via attributes. This will launch the login page, login with your AAD credentials . Over the years I have built a lot of stuff including web sites and services, systems integrations, data platforms and middleware. Select the Express management mode and click on “Select Existing AD app”. The token’s lifetime will be checked to ensure that it hasn’t expired. In previous post - Securing Function App with Azure Active Directory authentication we saw how function app can be secured with Azure active directory and how to make call to it. Click on Publish to publish the Azure function in Azure . 1. The Microsoft.IdentityModel.JsonWebTokens and System.IdentityModel.Tokens.Jwt NuGet packages contain all the libraries needed to validate JWT access tokens. This rule can associate the attribute with a custom binding as shown below: Finally, you’ll need to tell the Azure Functions host about the binding when it starts up. From Azure Active Directory > App registration click on New registration to create a new Azure AD app. 16. You’ll need to make sure you associate it with a subscription. To integrate an OpenID Connect provider with Azure Functions, we need to follow these steps: Obtain a client id and secret plus other config settings from the OIDC provider. Now that we have the app setup in Azure we also need to create some code. The example below will perform the following validation: Assuming that the token is being supplied as a "bearer token", you’ll need to take it from the “Authorization” header and strip off the leading "Bearer " text. If you’re not familiar with Azure AD and custom application registrations, I recommend that you use the Express option. I have an Azure function which requires AAD Authentication to access. This should receive all the configuration and context information it needs from the binding class, allowing for a clean and testable implementation that generates a ClaimsPrincipal from the incoming token. Configure Cross Origin Resource Sharing (CORS) Next , we can publish the same to Azure by clicking on “Import profile” & selecting the file in Step 4. check me out on LinkedIn. Firstly, you create an extension method that lets you add the binding to the host’s IWebJobsBuilder context as shown below: This code is executed in a custom Startup method that you’ll need to add to your project. The possible token header names are listed below: Azure Active Directory Token Request Headers: As of writing this, securing Azure Functions using Bearer token is clumsy. It is very important that you set the authorization level to anonymous, since we want to skip all checks done by Azure Functions. Opinions are my own and not the views of my employer, etc. Microsoft have published advice for maximising performance with Azure Service Bus, but there doesn’t appear to be any explicit advice for optimising the newer .Net Standard based SDK. It acts as a client that redirects the user to the login provider to retrieve an id_token. Runs on every request and passes the function context (e.g. In Postman, replace localhost host with Azure App URL mentioned in step 3 and verify its running fine as below: 11. 14. One API delegates to a second API using the on behalf of flow. Inevitably, this flexibility does come with a heavy burden of complexity. Create Function app in Visual Studio. // Get the configuration files for the OAuth token issuer, // Register the access token provider as a singleton, Optimizing Performance of the Azure Service Bus .Net Standard SDK, Managing and throttling serverless scaling with Azure Functions, Writing unit tests for Azure Functions using C#, Comparing serverless C# and .Net development using Azure Functions and AWS Lambda. The Azure Function app service is also easily configured with Azure Active Directory as an authentication provider. So, I used JwtSecurityToken in the Microsoft.IdentityModel.TokenseNuget package with a Symmetric Security Key to generate a signed signature. In Azure portal, navigate to our Function App, click on “Platform features” > “Authentication/Authorization” as below : 18. The interface definition below is an example of the kind of factory that can be injected. Runs when the Azure Functions host starts. Next Open Visual Studio, create a new project using the template shown below: Before creation it would ask to select the Azure Function type i.e v1 or v2. 27. With the addition of the built in Authentication and Authorization feature a simple application can be developed that pulls specific information about a logged in user from graph API without having to write any code that requests access tokens on behalf of the user. “Legacy” is often used a pejorative term to describe any long-lived code base that a development team finds distasteful to work with. Please make sure the status is running and navigate to the highlighted box URL in browser to make sure your app is running. Before clicking Save, under “Action to take when request is not authenticated” select “Log in with Azure Active Directory” & click on Save. // This is where we implement the actual authentication... // Creates a rule that links the attribute to the binding. AccessTokenResult just wraps the validated principal along with any errors encountered during the validation process. Next we create a sample Login.html file to invoke our login functionality, below is a sample I created for reference.. Next run your Login.html in browser as below & click on AZURE AD LOGIN button. You can inject an implementation of this in the new FunctionsStartup class provided in the new Microsoft.Azure.Functions.Extensions package as shown below: The actual function class will have a constructor that receives an instance of IAccessTokenProvider. One typical scenario I come… In this case, the resource is the Azure Function App. You can now write compiled Azure functions in C# with full unit test coverage, though there are a few obstacles along the way. First of all you’ll need to create an Azure AD B2C tenant. 12. The Blazor UI Client is protected like any single page application. An Azure Storage account is required by a function app running in Azure. My users can use the Client ID & Secret to connect to this function and call it. So, then I had to explore other options. The method signature below shows what this looks like –  the principal argument has been decorated with a custom binding argument called AccessToken.Â. Copy the token & lets go back to our POST request in postman tool described is Step 22, This time add a header “X-ZUMO-AUTH” with the request and value as the authentication token acquired in previous step. If you want learn more on how to use the OAuth2 authentication protocol to access Azure, just go here: Use Azure AD v2.0 to access secure resources without user interaction You can use the OAuth 2.0 client credentials grant specified in RFC 6749, sometimes called two-legged OAuth, to access… For HTTP-triggered functions, you can specify the … You will see this time the request is successful & gives desired output as shown below. 23. You can follow me on Twitter or For some auth providers, you can enable App Service Authentication in the Azure Portal but that only works for the deployed version of your app which makes testing locally difficult and clumsy. You will need to remember to invoke the factory's ValidateToken method for every function request as shown below: The source code below contains examples for both approaches - custom tokens and dependency injection. by returning a 401 Unauthorized response. Next, click on the “Get publish profile” (see below) link and download the file and save it on your disk. I have named it as AuthTokenGenerator. The implementation involves creating half a dozen small classes to wire everything into the Functions SDK: The attribute definition can be a simple, empty attribute class definition that is decorated with a Binding attribute. Designing good architecture is only half the battle. Here is the URL I use for invoking. In this article, I’ll talk about how you can integrate Azure functions with Microsoft.Identity.Web, and I’ll use dependency injection in Azure Functions to do so. Open you postman tool, run the function by creation a Post request as shown below to make sure our newly created function is running fine without any error. Happy Coding! When it's enabled, every incoming HTTP Once that is done, a caller of the Azure Function must first authenticate with Azure AD, requesting an OAuth access token for the intended resource. Ideally you need to separate function definitions from the authentication mechanism they are using, so they can just consume a ClaimsPrincipal that has been created elsewhere. This time we’ll select Advanced instead of Express. After successful login , once this break-point hits as explained in previous step it provides the authentication token. Data Vault 2.0 modelling can support a more agile approach to data warehouse design and data ingestion. Injecting a principal directly into the function definition eliminates the need for any boiler plate. Azure functions provide great features such as extensive choice of languages for development, integration with other SaaS offerings, integrated security with many OAuth Providers etc. Using the built-in dependency injection is cleaner, involves less code and is the approach I would take for any new projects. Validating access tokens based on Json Web Tokens (JWTs) is relatively straightforward, but there’s no middleware in Azure Functions that you inject the result into a function. What do we really mean by “legacy” and how should we be dealing with it? Publish the newly created function API to Azure, so that it becomes available publicly. Enable App Service authentication & select Azure Active Directory under Authentication Providers as below : 19. 5. There can be a tension between the lean, experimental nature of agile development and the more deliberate, planned demands of a large organisation. This site also contains a list of all published articles and an archive of older stuff. When you secure an Azure Function App with Azure AD, you first create an Azure AD application that is then associated with the Azure Function. All the work around token validation happens in the value provider class - AccessTokenValueProvider. Select the Storage category, then select Storage account. Each downstream API uses a different type of access token in this demo. You could add some boiler plate at the beginning of every function, but this is a little messy and difficult to test. This pattern is common in most Azure SDKs, and it is also the case in Python. Generate a New client secret by clicking on the button “New Client Secret” & providing key name. In Part 1 we created an Azure Function App and a basic function. I’ll call mine “SampleFunc”. This is a public client which cannot keep a secret. The AccessTokenResult is just a custom class that encapsulates the result of the validation. In the .Net world the ideal mechanism would be to find some way of injecting a ClaimsPrincipal instance into the running function. The authentication and authorization module runs in the same sandbox as your application code. Authentication of these calls can be implemented with the OAuth2 Implicit Grant pattern. A technology radar can be a great technique for initiating conversations about technology, but there are some challenges in applying it to in-house development shops. Azure Functions have a rich functionality in terms of security and authentication, but options for custom auth are limited. The code below demonstrates this – note the use of the assembly attribute that tells the Azure Functions runtime to use the Startup class when the host initializes. Once you have a Function App you need to switch on authentication before it will work. For the JAMstack architecture, implemented on Azure, clients will connect to the Azure Function configured as an HTTP Trigger. Custom token authentication in Azure Functions. 17. An extension configuration provider that wires the attribute and the custom binding together. AAD assign unique ID with each app, and each authentication is logged. Please note on login button click I am invoking AAD login by below code, after successful authentication this returns me the authorization code, which I pass as a parameter to our AuthTokenGenerator function. .Net Core 16. In a normal AD authentication, all the systems/users in a network are a part of the directory and they can access the secured system with their AD credentials. Accessing the Tokens. With Azure Functions your options for mitigating this are limited, though the new durable functions may provide an answer…. 15. Once created you can go the newly create Function App from All Resources in the menu. Inside the function, I need to authenticate to CRM and do some CRUD Actions. Now you can use dependency injection to create a factory class that can return a validated principal from an Http request. This function will receive authorization code from AAD identity provider after successful authentication. The actual token validation only requires a few lines of code: Until the 1.0.28 release of Azure Functions, custom bindings was pretty much the only way of using a custom OAuth provider with Azure Functions. Replace the client id with your Azure AD app client id, for debugging locally I have used redirect_uri as localhost with my locally running port . Use custom authentication. 3. 25. Both the Blazor client and the Blazor API are protected by Azure AD authentication. You can use Visual studio, Visual Studio for Mac, or Azure functions command line tools to do so. My current focus is on providing architectural leadership in agile environments. The Azure Function linked service doesn’t seem to support calling functions with autentication! 22. Meanwhile also run your Azure Function locally and create a debug point as shown below. Once it generates access token it creates another POST request to default login endpoint for Azure AD by passing access token in request body & receives authenticationToken . You don't have to remember to validate the principal - it's just sitting there for you. Securing Azure Functions using Azure AD JWT Bearer token authentication for user access tokens. The option I went for was to secure the app by requiring Azure AD authentication. Filed under Please note that this may vary depending on your choices and subscription. instance for the supplied header and configuration values. The below code generates access token based on that authorization code. Provide the required details such as App Name, Hosting plan, Subscription, OS, Resource group, Location, Runtime stack and Storage account. In Azure Function app/service app level, once you enabled the Authentication / Authorization and configured the app settings to use AAD as below, a new app is registered automatically in the backed (with same name as the Function app/service app), along with a service principle, Therefore we can re-use the same/cached access token (Instead of create … If you want to validate tokens issued by an external OAuth server or integrate with a custom solution, you’ll need to create the plumbing yourself. How to Add Color to SVG Icons and Elements With CurrentColor, The Fine Line Between Terrible & Awesome Developers, 5 Proven Ways To Make Money Without a Job as a Developer, Let’s scrape the web (with Selenium)— Part 2, Stop Wasting Time Troubleshooting Technology, Managing application secrets like never before, Using AWS S3 and CodeDeploy. Provide a name & the account types as per your need & click on “Register”. Click on create to provision the Function App for you. Supply the client secret in an app setting. To enable authentication in Azure Function. If you want to validate tokens issued by an external OAuth server or integrate with a custom solution, you’ll need to create the … window.open(‘https://login.microsoftonline.com/vaishnaw.onmicrosoft.com/oauth2/authorize?client_id=53a9a189-123e-4490-9f06-7b2a6f191b68&response_type=code&redirect_uri=http://localhost:7071/api/AuthTokenGenerator&scope=openid&state=12345&nonce=7362CAEA-9CA5-4B43-9BA3-34D7C303EBA', null, ‘width=600,height=400’). Working with Claims. In your azure portal, go to All Resources > New > Server-less Function app as shown below . At this point, we have our function publicly available without any security restrictions, however in real life scenarios it would make more sense if this is secure, We will secure this with Azure AD Identity provider in next steps . An extension method that lets you register the binding when the Azure Function host starts up. This was pretty easy – here is my token generation code: For our purposes we want to be able to decode the token to get some non confidential information (the username) so we can do some lookup for user related information – we could also choose to use the UserId as well here if we so desired (in fact we should if the use… See Configure your App Service or Azure Functions app to use Azure AD login. If you’re building Azure Functions, you generally have two options when it comes to implementing authentication and authorization: Use the App Service Authentication integration which is great if you are using one of the standard identity providers (Azure AD, Microsoft Account, Facebook, Google, and Twitter). This library makes it easy to authenticate a user by validating a bearer token. Provides a new binding instance for the function host. Called from Startup to load the custom binding when the Azure Functions host starts up. What I ended up with was the REST linked service. Next in VS, open local.settings.json file and create key value pairs as shown below : SampleADAppClientId is the client id of your Azure AD OAuth app which we noted in Step 14, SampleADAppClientSecert is the client secret we generated in Step 14, SampleADAppRedirecturi is the URI of the authentication function we will create in step 25, please note we need to change the localhost to your Azure Function app URL in production environment before publish. 4. 20. Next create a new HttpTrigger function in the same project in VS. For this example I have selected v1 with Http Trigger, Access right as Anonymous & Storage account as Storage Emulator as shown below: 6. It also makes the function testable as you can inject security principals into the function from test code. To enforce authentication on your Functions go to “Function app settings”, and then click “Configure Authentication”. Select our newly created “SampleADApp” created in previous steps & click on ok. 21. 7. How Azure AD authentication functions. (You can head over to https://functions.azure.com, and get started if you haven’t been there already.) I am a London-based technical architect who has spent more than twenty five years leading development across start-ups, digital agencies, software houses and corporates. Since a couple of months Azure App Service Authentication (also called EasyAuth)is now available for Azure Functions. , Serverless. This article provides high level idea on an Azure AD authentication for a .NET Application and an Android App with .NET back-end. Next in Azure portal, go back to your Azure AD registered app & configure the Redirect URI as shown below, after successful authentication from our AAD login page, AAD identity provider will redirect to our authentication function which we create in next step. Twitter or check me out on LinkedIn your Login.html in browser to make sure you associate it with subscription! 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Select Advanced azure function token authentication of Express simple web page before it will work through both implementations to worry about,...

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