I'm new to OAuth and its app identity method. I use app identity to access an API using OAuth. I found a tutorial here.
In the source code, since both web application and API will be using AAD, why does it not have AADAuthenticationExtensions.cs and AADOptions.cs classes?
It is an asp.net sampe which uses ADAL library to obtain the access token. Here is the the client credential flows.
The AzureAdAuthenticationBuilderExtensions.cs and AzureAdOptions.cs apply to ASP.NET Core and you find the sample here.
Related
I have asp.net core 3.1 Web API project that needs to call Microsoft Azure API ( for e.g. Storage API on behalf of other user (Impersonation).
I believe this can be achieved by Azure App Registration and then creating Impersonation for user by acquiring token interactive first and then silently with Microsoft.Identity.Client library.
But how do I do this from my API since I don't want to use any interactive authentication from within API.
What is the ASP.NET Core 3.0 friendly version for Web API authentication for Microsoft.Identity.Client .NET library
Any examples would be helpful...
You can implement getting tokens on behalf of a user (Service to service calls) use on-behalf-of flow (OBO) with MSAL , you can check the document & code snippets from document here using MSAL 2.3 + .
If your web api is protected by Azure AD, you can use On behalf of flow. Here is the scenario regarding a web API that calls web APIs.
If your web api is not protected by Azure AD and you want to use user token, you must use interactive authentication or ropc flow to call Azure API.
Reference:
Web API calling Microsoft Graph.
Please help me.
To login into Azure active directory how to use MSAL.Net library in my login page of my website.I am seeing very big samples online but I didnt find small peace of code which makes me to understand MSAL.
MSAL Library is just an implementation for enabling developers to acquire tokens from the Microsoft identity platform endpoint.
If you want to use MSAL to acquire a token, you need to:
Register an application in Azure AD.
Add target API, and grant consent to select permissions.
Generate a secret key.
Then you can get a token as Acquire a token and call Microsoft Graph API.
However, I think what you really want is to integrate AAD. You can easily enable AAD authentication for your .NET web application. It uses OWIN middleware.
If you are using a aspnet or aspnetcore, you can get the necessary code needed to sign in your web application with your Azure AD tenant just by following steps.
Create the sample from the command line
Note that MSAL.NET is a token acquisition library (for services like MS Graph and such) that can optionally sign-in users as well. the sign-in code is present in the aspnet and aspnet core SDKs
I have created new web service using VS 2019 ASP.NET Core Web API from the project template with AAD authenticalion. It creates a simple ValuesController and sets up AzureAdBearer authentication in StartUp, but there is no pointers of what do next. There are no doc links in the created project, and no comments. I could not find any documents on https://learn.microsoft.com/ referring this template, all examples there refer to other sample projects, which use different code constructs, authentication types, etc.
Out of the box, the project simply returns 401, whether run locally or published to Azure Web Service.
Is there any guidance on what to do next and make this template work?
A WebApi is out on the internet waiting for a client to call it with an access token in its headers.
Usually, to learn about this scenario, you would create a couple of projects in Visual Studio, a Web Api and a client app of some sort that calls this web api.
The client app will request an access_token for this web api from Azure AD and sent it along in its call to the api.
The generated code validates this access token to ensure that its a valid one and issued for this Api (among other things).
I'd suggest you try one of Please use the samples provided at Azure Active Directory Home page for developers
You can refer to code sample : Calling a web API in an ASP.NET Core web application using Azure AD .
Your web api is now protected by Azure AD , if any client call your api , it should append Azure AD Access token as a Bearer token to the Authorization header in an HTTP request . Your web api will validate the token and authorizes the user using the JWT bearer authentication middleware(AzureAdBearer middleware) .
Your client app could uses the OpenID Connect middleware and the Active Directory Authentication Library (ADAL.NET) to obtain a JWT bearer token for the signed-in user using the OAuth 2.0 protocol. Then the client app can use that token to access your protected API . See TodoListWebApp project .
Here's my current situation:
Xamarin iOS mobile app (using MobileServiceClient to login)
Azure Mobile/App Service (ASP.NET Web API) with Azure AD authentication
I would like to modify the Authentication part of this process to be handled by Okta instead of the Azure AD. How can I setup Okta or any other 3rd party Identity Provider Service similar to Okta as the ipd for both my mobile app and the api web service? Azure claims that you can use any Auth capable 3rd party provider but I don't see any way to integrate such a provider in Azure portal.
I found this url to a tutorial for custom Authentication: https://adrianhall.github.io/develop-mobile-apps-with-csharp-and-azure/chapter2/custom/
From this post:
IdentityServer 4 as Identity Provider for Azure App Service
Is this really the only way to do it? I would really rather keep using the server flow through MobileServiceClient and configure Azure to use the 3rd party OAuth identity provider, does any one have an example or additional information on how to do this?
Thank you for your help, maybe someone from the Azure team can enlighten us on this topic, I have not seen any documentation or examples of how to do it in their documentation so far.
Client:
Found a working library for OAuth2 and OpenID that worked for integrating with Okta:
https://github.com/openid/AppAuth-iOS
https://github.com/openid/AppAuth-iOS/tree/master/Examples
with a Xamarin wrapper:
https://github.com/xamarin/XamarinComponents/tree/master/XPlat/OpenId
Tested it with Okta for client Auth with 2 factor authentication and it works well. On to figure out the App Service part.
After more research and trial and error, I've found the right combination that works for what I'm trying to do. Here's an outline of what it is:
Okta (identity provider)
set up a native application with an Implicit (Hybrid) grant on it
Mobile Client
use an OpenID Connect component for Xamarin.iOS, in my case https://github.com/openid/AppAuth-iOS
Server / Web Api
converted my asp.net web api webservice to an asp.net core web api webservice so I can use the latest owin middleware to validate jwt bearer tokens submitted in the header of calls to the secured endpoints, here's an example of how to set that up with Okta: https://developer.okta.com/quickstart/#/ios/dotnet/aspnetcore
One thing to note that tripped me up along the way:
in the client, after successfully authenticating with Okta through an OpenID Connect component, you will receive user information which will include an id_token and an access_token, although it might seem natural to use the access token to send with your api calls to the server, that's actually not the case, the access token is supposed to only be used to get userinfo and is not a validated token because it gets regenerated regularly, id token on the other hand contains the signature that the server needs to validate that the header and the payload of the token haven't been tampered with, this difference between these two tokens can be observed by the number of . delimited parts contained within the token, access token has only 2 . delimited parts, header and payload, id token has 3 such parts, header, payload and signature
read more information about jwt tokens here: https://auth0.com/learn/json-web-tokens/
I wrote a little server in node.js and deployed it to Azure WebApp. I want to add service-to-service authentication using Azure AD OAuth (like this flow). I alredy did this in another WebApi sevice using Katana.
So, I found the official library for this, and it work great. The only problem is that the library use the ursa module, which is a native module. And, like explained here it is not easy to deploy a WebApp with native modules.
So, my question is - what is the best approach? How I could accomplish authentication using Azure AD OAuth?
Thanks,
Omer
Take a look at the Authentication / Authorization feature of Azure Web Apps. It allows you to do OAuth 2.0 service-to-service auth flows using Azure AD, no code changes necessary (also, it works with any stack, not just node.js).
More high-level info here: http://azure.microsoft.com/blog/2014/11/13/azure-websites-authentication-authorization/
The post is a bit dated and doesn't mention the recently added support for APIs, but if your client can acquire an OAuth token from Azure AD, you can send it to your node.js server as a bearer token in the Authorization header of your HTTP request and have the authorization just work.
Two things to be aware of if you go down this route:
Authentication / Authorization currently blocks ALL unauthenticated access to your node.js API. You won't be able to say that some APIs are protected and some are not.
The JWT token that you send to your node.js API must use the client_id GUID value as the value for the "aud" claim. Using the app URI (as shown in some Azure AD samples) will not work.
Give it a try and see if it works for you.