OAuth Authorization Service in ASP.NET Core

Question

In Web API 2, you used to be able to create an endpoint to issue a token by setting up an OAuth Authorization Server via middleware like below:

//Set up our auth server options.
var OAuthServerOptions = new OAuthAuthorizationServerOptions()
            {
                AllowInsecureHttp = true,
                TokenEndpointPath = new PathString("/token"),
                AccessTokenExpireTimeSpan = TimeSpan.FromDays(1),
                Provider = new SimpleAuthorizationServerProvider()
            };

 // Sets up the token issue endpoint using the options above
 app.UseOAuthAuthorizationServer(OAuthServerOptions);

Perhaps I'm missing it, but I'm trying to figure out how to do this in ASP.NET Core. I've looked through the source (https://github.com/aspnet/Security) but I don't really see anything analogous. Is there a new way to accomplish this? Do I need to just create a controller and do it myself?

I see how OAuth Authentication can be set up via Middleware, but this regards the authorization portion where I issue claims from my API.

perhaps this could help. it's an answer with thinktecture's identity server : stackoverflow.com/questions/29360563/… — Cedric Dumont
Thanks @CedricDumont, I was looking for something integrated, but I've considered Thinktecture. End of day that may be what I go with. It's very solid. — swannee

Kévin Chalet Kévin Chalet · Accepted Answer · 2015-03-19T12:00:58

EDIT (01/28/2021): AspNet.Security.OpenIdConnect.Server has been merged into OpenIddict as part of the 3.0 update. To get started with OpenIddict, visit documentation.openiddict.com.

Don't waste your time looking for an OAuthAuthorizationServerMiddleware alternative in ASP.NET Core, the ASP.NET team simply decided not to port it: https://github.com/aspnet/Security/issues/83

I suggest having a look to AspNet.Security.OpenIdConnect.Server, an advanced fork of the OAuth2 authorization server middleware that comes with Katana 3: there's an OWIN/Katana 3 version, and an ASP.NET Core version that supports both the full .NET framework and .NET Core.

https://github.com/aspnet-contrib/AspNet.Security.OpenIdConnect.Server

ASP.NET Core 1.x:

app.UseOpenIdConnectServer(options =>
{
    options.AllowInsecureHttp = true;
    options.TokenEndpointPath = new PathString("/token");
    options.AccessTokenLifetime = TimeSpan.FromDays(1);
    options.TokenEndpointPath = "/token";
    options.Provider = new SimpleAuthorizationServerProvider();
});

ASP.NET Core 2.x:

services.AddAuthentication().AddOpenIdConnectServer(options =>
{
    options.AllowInsecureHttp = true;
    options.TokenEndpointPath = new PathString("/token");
    options.AccessTokenLifetime = TimeSpan.FromDays(1);
    options.TokenEndpointPath = "/token";
    options.Provider = new SimpleAuthorizationServerProvider();
});

To learn more about this project, I'd recommend reading http://kevinchalet.com/2016/07/13/creating-your-own-openid-connect-server-with-asos-introduction/.

Good luck!

OAuth Authorization Service in ASP.NET Core

2 Answers