OpenID Connect Relying Party Example for ASP.NET.

This example covers how to implement and configure a ASP.NET Core project to work OpenID Connect (OIDC) utlizing Onegini's OpenID Connect Provider (OP).

Clone and configure your IDE

To get the example up and running, clone the project and setup the configuration:

Clone this repo using https or ssh. e.g.:

git clone https://github.com/Onegini/dotnet-mvc-oidc-example.git

Rider and Visual Studio

Go to File->Open->Solution or Project and open dotnet-mvc-oidc-example.sln.

Run configuration can be changed within launchSettings.json.

Onegini Configuration

You'll need to properly setup your client using the Onegini Admin panel before you can begin testing. Refer to the OpenID Connect documentation.

This project requires a Web client that accepts the openid and profile scope. Add the scope email to see additional claims when the Identity Provider returns this information.

The Onegini Token Server only redirects to preconfigured endpoints after login or logout. You must configure the following endpoints in the Onegini Token Server: * Redirect URL: https://localhost:5001/signin-external * Post Logout Redirect URL: https://localhost:5001/signout-callback-oidc

Set up the application configuration

We have provided some sample configuration for the project below, it uses the default appsettings.json setup. If you wish to use different configuration, you may need to modify the code inside 'Startup.cs' accordingly.

We have provided two application settings json files for you with placeholders, one for development and one for production. See appsettings.Development.json and appsettings.json. You'll need to fill in real values for the placeholders. Here are some examples of what that might look like:

appsettings.Development.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*",
  "oidc":{
    "issuer":"http://localhost:7878/oauth/",
    "clientId": "openid-client",
    "clientSecret": "secret",
    "requireHttpsMetadata": false
  }
}

Run and test

Run and test the example. You should be able to see a page with login button at the upper right. When you click it you're redirected to the OP to login. When successful, you should be redirected back. Now you should see a logout button and a username. The username will be whatever is returned as the "sub" claim. The "sub" is always returned as part of the standard claims).

Components in this application

Configuration

The configuration we set up is used inside Startup. You'll need to register your application to get a clientId and a clientSecret. Also you need to know the issuer url where the OP resides. Refer to the Onegini Configuration section above if you don't know where to get these values from or ask your administrator.

Startup

Inside the ConfigureServices(IServiceCollection services) method we use the AddOneginiOpenIdConnect builder method to add a scheme that will authenticate using our OP. Inside the callback of this builder, we can configure the OIDC settings we want to use. One important thing to review is the NameClaimType as shown in this code:

o.TokenValidationParameters = new TokenValidationParameters
{
    NameClaimType = ClaimTypes.NameIdentifier
};

It dictates to the ASP.NET framework that we want to use that claim as the username. You can change it depending on the claims available in your environment. Default claims within ASP.NET will have the name provided by the ClaimTypes class. Custom claims will have their original name, and you can refer to them using their original name.

o.TokenValidationParameters = new TokenValidationParameters
{
    NameClaimType = "recovery_email" //Or whatever name claim name you want to use
};

Inside the Configure(IApplicationBuilder app, IHostingEnvironment env) method we call app.UseAuthentication();. This will trigger the framework to use the authentication middleware setup inside ConfigureServices.

Onegini OIDC handler

In the above chapter, you might have noticed that we use the AddOneginiOpenIdConnect builder method. This method does not exist in the default ASP.NET Core library. ASP offers the AddOpenIdConnect method, but due to an issue with RFC6749 2.3.1. in Microsoft's implementation of the OAuth spec, it does not work with our OP. To fix this issue we extend the original OIDC handler and overwrite the RedeemAuthorizationCodeAsync method. This is done inside the OneginiOpenIdConnectHandler.

The OneginiOpenIdConnectExtensions class adds the builder methods to the Authentication builder. To add the Onegini OIDC handler you can create a class library or you can add it directly to your project.

Controller

For the OneginiOpenIdConnectHandler to work, we need to add an AccountController. The Login() and Logout() are required, the Profile method is mainly for demonstration purpose. It shows you how to retrieve the access token used to query any backchannel resource gateways. Also it loads the Claims page that will show you the current set of claims retrieved from the OP during authentication.

When you want a user to be authenticated or authorized you can use the ASP.NET default patterns and annotations like [Authorize].

View

As stated above there is a 'Claims.cshtml' file that shows the claims for demonstration purpose. You can see how we get access to the claims within the view, you can use this to change the view based on the claims available.

Inside _LoginPartial.cshtml, you can find the logic we use to show the login url when a user is not authenticated and a logout url when the user is authenticated.