ASP.NET Core: Storing Tokens

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By Andres Aguiar
Version: v1.1

Sample Project

Download a sample project specific to this tutorial configured with your Auth0 API Keys.

System Requirements
  • .NET Core 1.1.0
  • ASP.NET Core 1.1.1
  • Microsoft.AspNetCore.Authentication.OpenIdConnect 1.1.1
Show requirements

The OIDC middleware in ASP.NET Core will automatically Decode the ID Token returned from Auth0 and will automatically add the claims contained in the ID Token as claims on the ClaimsIdentity.

This means that inside any of the actions in your controllers you can simply use User.Claims.FirstOrDefault("<claim type>").Value to obtain the value of a particular claim.

The seed project contains a controller action and view which will display the claims associated with a particular user. Once a user has signed in, you can simply go to /Account/Claims to see these claims.

Storing the Tokens

Sometimes you may want to access the tokens received from Auth0. For example, you may want to get the access_token to authenticate against API calls. In order to do this, you will need to set the SaveTokens property of OpenIdConnectOptions to true. This will save the tokens to the AuthenticationProperties:

// Startup.cs

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory,
    IOptions<Auth0Settings> auth0Settings)
    // Some code was omitted for brevity...

    var options = new OpenIdConnectOptions("Auth0")

        // Saves tokens to the AuthenticationProperties
        SaveTokens = true,

        Events = new OpenIdConnectEvents
            // handle the logout redirection
            OnRedirectToIdentityProviderForSignOut = [...] // omitted for brevity

To subsequently retrieve either of the tokens you can call GetAuthenticateInfoAsync to retrieve the AuthenticateInfo. The tokens will be available in the Properties of the AuthenticateInfo object, stored in the format .Token.<token name>:

// Inside one of your controller actions
if (User.Identity.IsAuthenticated)
    var authenticateInfo = await HttpContext.Authentication.GetAuthenticateInfoAsync("Auth0");
    string accessToken = authenticateInfo.Properties.Items[".Token.access_token"];
    string idToken = authenticateInfo.Properties.Items[".Token.id_token"];
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