Blazor identity server

Authentication and authorisation are two fundamental functions in most applications today. Until recently, it wasn't very clear how to best achieve these functions in Blazor applications. But with the release of ASP. NET Core 3 Preview 6 that all changed. In this post, I'll show you how you can create a new server-side Blazor application with authentication enabled. Then we'll take a high level look at the services and components which are used in the application. Let's start with the difference between authentication and authorisation as this can sometimes be a bit confusing for new developers.

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This can be done in many different ways, but the most common for web applications is a username and password check. Another example of authentication is using your pin code with your debit card at a ATM.

Whatever the mechanism, authentication verifies you are who you say you are. But what it doesn't do is define what you have access to, that is where authorisation comes in.

Authorisation occurs after an identity has been established via authentication and determins what parts of a system you can access. For example, if you're have administrator rights on a system you can access everything.

But if you're a standard user, you may only be able to access specific screens. We'll get stuck in straight away by creating a new Blazor server-side application with authentication enabled. When you hit the project type screen, select Blazor Server App then select the Change link under Authentication.

ASP.NET Core Blazor authentication and authorization

Click the Register link in the top right and fill in your details. Then click Register. You should then be presented with the following screen prompting you to run migrations. This will setup the database which holds the account details. Click the Apply Migrations button, then refresh the page when prompted.

You should then be redirected back to the home page as an authenticated user. You should see the Register link has been replaced with your email address and a Log out button. We now have a working Blazor app with authentication, so how is all this achieved?In part 1 of this series, I showed how to create a server-side Blazor application with authentication enabled.

NET Core Identity. If you are not familiar with ASP. Once the solution has been created we're going to start making some changes to the server project. You can either add the above packages to your server projects.

Before we can set anything up, database wise we need a connection string. This is usually kept in the appsettings. Then select App Settings File from the list.

The file comes with a connection string already in place, feel free to point this where ever you need to. I'm just going to add a database name and leave the rest as default. In the root of the server project create a folder called Data then add a new class called ApplicationDbContext with the following code. Because we are using Identity which needs to store information in a database we're not inheriting from DbContext but instead from IdentityDbContext.

In the Startup class we need to add a constructor which takes an IConfiguration and a property to store it. IConfiguration allows us to access the settings in the appsettings. Essentially, these two lines are adding the ApplicationDbContext to the services collection. Then registering the various services for ASP. We're now in a position to create the initial migration for the database.

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In the package manager console run the following command. Run Update-Database in the console to apply the migration to your database. If you have any issues with running the migration command, make sure that the server project is selected as the default project in the package manager console.

The next step is to enable authentication in the API. Again, in ConfigureServices add the following code after the code we added in the previous section. The code above is adding and setting up some services required for authentication to the service container.

Feel free to tweak these settings to your requirements. We haven' actually added them to the appsettings file yet, so let do that now.

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While we're there we'll also add a setting to control how long the tokens last, which we'll use in a bit. It's really important that the JwtSecurityKey is kept secret as this is what is used to sign the tokens produced by the API.

If this is compromised then your app would no longer be secure.

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As I'm running everything locally I have my Issuer and Audienc e set to localhost. But if you're using this in a real app then you would set the Issuer to the domain the API is running on and the Audience to the domain the client app is running on. Finally, in the Configure method we need to add the necessary middleware to the pipeline. This will enable the authentication and authorization features in our API. Add them just above the app.

UseEndpoints middleware. That should be everything we need to do the Startup class. Authentication is now enabled for the API.

blazor identity server

You can test everything is working by adding an [Authorize] attribute to the WeatherForecasts action on the SampleDataController. Then startup the app and navigate to the Fetch Data page, no data should load and you should see a error in the console.By Steve Sanderson and Luke Latham. Blazor Server is supported in ASP. NET Core 3. If you aren't using Visual Studio version NET Core Blazor. Because Blazor Server apps run on the server, authorization checks are able to determine:.

Blazor WebAssembly apps run on the client.

Authentication with client-side Blazor using WebAPI and ASP.NET Core Identity

Authorization is only used to determine which UI options to show. Since client-side checks can be modified or bypassed by a user, a Blazor WebAssembly app can't enforce authorization access rules. Razor Pages authorization conventions don't apply to routable Razor components. If a non-routable Razor component is embedded in a pagethe page's authorization conventions indirectly affect the Razor component along with the rest of the page's content.

Blazor uses the existing ASP. NET Core authentication mechanisms to establish the user's identity. In Blazor WebAssembly apps, authentication checks can be bypassed because all client-side code can be modified by users.

The same is true for all client-side app technologies, including JavaScript SPA frameworks or native apps for any operating system.

blazor identity server

To handle authentication, implementation of a built-in or custom AuthenticationStateProvider service is covered in the following sections. For more information on creating apps and configuration, see Secure ASP. Blazor Server apps operate over a real-time connection that's created using SignalR.

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Authentication in SignalR-based apps is handled when the connection is established. Authentication can be based on a cookie or some other bearer token. This is how authentication state integrates with existing ASP. NET Core authentication mechanisms.

AuthenticationStateProvider is the underlying service used by the AuthorizeView component and CascadingAuthenticationState component to get the authentication state. You don't typically use AuthenticationStateProvider directly. The main drawback to using AuthenticationStateProvider directly is that the component isn't notified automatically if the underlying authentication state data changes.

The AuthenticationStateProvider service can provide the current user's ClaimsPrincipal data, as shown in the following example:. If user. IsAuthenticated is true and because the user is a ClaimsPrincipalclaims can be enumerated and membership in roles evaluated.

NET Core.

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ConfigureServices :. Using the CustomAuthStateProvider in the preceding example, all users are authenticated with the username mrfibuli. IsAuthenticated is trueclaims can be enumerated and membership in roles evaluated. Main :. In a Blazor Server app, services for options and authorization are already present, so no further action is required. After a user is authenticated, authorization rules are applied to control what the user can do. Each of these concepts is the same as in an ASP.

For more information on ASP.In the previous tutorial, you created a public web API and learned the right way to access it from a server-side Blazor application.

Specifically, you will restrict access to the API to only select applications that are authenticated via a secret key. To create the auth server, you will use IdentityServer4.

Install the relevant Nuget packages by issuing the following commands in the Package Manager Console or in a PowerShell terminal. Recall, in this series we are creating a contact management application using Blazor.

Open the BlazorContacts solution in Visual Studio. With the root solution folder open in your file explorer, you should see a BlazorContacts. API directory, a BlazorContacts. Shared directory, and a BlazorContacts. Web directory among other files and folders.

blazor identity server

Create a new folder called BlazorContacts. Navigate to the new BlazorContacts. Auth folder in a PowerShell terminal and run the following command to scaffold a new IdentityServer4 empty template. Once the template is created, you must add the new project to your existing BlazorContacts solution in Visual Studio.

Auth folder you created and select the BlazorContacts. Your BlazorContacts. Auth project is templated with an empty Config. In Config. The AllowedGrantTypes line indicates that authentication is performed using client credentials. That is to say that the combination of client ID and a secret key are used to authenticate the client application itself to the auth server.

Finally, the AllowedScopes line indicates that this particular client should have access to the blazorcontacts-api API that was previously defined. Note : It is important to use secure keys and to securely hash them. In another tutorial, you will learn a more secure technique for including sensitive data in your projects.

With the authentication server set up, it will issue access tokens to the client, authorizing it to access interfaces within its allowed scopes. You now need to configure the web API and clients, themselves.

The API should operate as blazorcontacts-apias defined in Config. Install and reference the Microsoft. JwtBearer package for the BlazorContacts. API project. Then, open the Startup. API and locate the ConfigureServices method.Blazor Server is supported in ASP. NET Core 3.

The guidance in this article applies to the ASP. To obtain the latest Blazor WebAssembly template version 3. NET Core Blazor. To specify the output location, which creates a project folder if it doesn't exist, include the output option in the command with a path for example, -o BlazorSample. The folder name also becomes part of the project's name. The following sections describe additions to the project when authentication support is included. The authentication middleware that is responsible for validating the request credentials and setting the user on the request context:.

NET Core scenarios. IdentityServer is a powerful and extensible framework for handling app security concerns.

IdentityServer exposes unnecessary complexity for the most common scenarios. Consequently, a set of conventions and configuration options is provided that we consider a good starting point. Once your authentication needs change, the full power of IdentityServer is still available to customize authentication to suit an app's requirements.

The AddIdentityServerJwt helper method configures a policy scheme for the app as the default authentication handler. The JwtBearerHandler handles all other requests.

Introduction to IdentityServer for Core

Additionally, this method:. The attribute indicates that the user must be authorized based on the default policy to access the resource. The default authorization policy is configured to use the default authentication scheme, which is set up by AddIdentityServerJwt to the policy scheme that was mentioned earlier. The helper method configures JwtBearerHandler as the default handler for requests to the app. To gain full control of the database schema, inherit from one of the available Identity DbContext classes and configure the context to include the Identity schema by calling builder.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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If nothing happens, download the GitHub extension for Visual Studio and try again. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. A sample project that contains a blazor app working with ef identity. Branch: master. Find file. Sign in Sign up.

Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit 95c26dd Feb 22, Blazor with Identity A sample project showcasing a blazor app using ef core with identity How to run Install dotnet-sdk Clone or download. Open the solution in Visual Studio and press F5. Create a user using the Create Account button in the login page or login if you have already created a user.

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I attempted to build this application myself but, have hit several stumbling blocks along the way.

I am thinking that it may be best to step back and take a larger look at what I am trying to create. There doesn't seem to be any documentation on how to make what I am looking for. Ultimately what I would like is to have a Blazor server-side application make API calls to use data in the app and then have an IdentityServer4 encapsulate the authentication.

I need to have Azure as well as ASP. I can make calls to this from Postman to get token and such. But, when it comes to tying a Blazor server-side application to the IdentityServer4 I am befuddled. I have tried to ask this question in specifics but, haven't gotten any results at all.

I am hoping maybe this larger look at it might be helpful. It seems like odic-client. NET Authorization in Blazor server-side. How do I get these to work together. Follow the links provided in the last part of this answer. I'll show you some of the code I used, maybe you can make some use of it. Using the NuGet Package Microsoft. Now it should say "Not authenticated" when you open the main page but there's still no redirection to the IdentityServer4.

For this you've got to add MVC in the startup too, as I learned from this stackoverflow question :. Now you should be getting redirected to IdentityServer4 to log in after starting the application. I use DI to inject the ApiClient and add the access token:. Like you said, there is not much documentation on this topic except some answers here on stackoverflow. It took me a long time to set this up, so I hope I can help someone else with this post. Logging out with this setup requires a detour to a razor page because the HttpContext is inaccessible after the blazor component is loaded.

Create a new Razor Page in the Pages folder and add the following code to the newly created Logout. Add a logout button somewhere which calls the function UriHelper.

The previously described login process worked locally but after publishing to the test server, I had the problem, that the IHttpContextAccessor was always null inside the AddHttpClient method. So I ended up using the same workaround as with the logout process.

I let the IdentityServer redirect to a razor page which always has a HttpContextsave the access token in the user claim and redirect to the index page. In the AddHttpClient method I only get the token from the user claim and put it into the authentication header. I still struggle to get this setup working on our server. I opened this issue and requirement on the AspNetCore Github but both got closed without a proper answer.

Learn more. Ask Question. Asked 8 months ago. Active 3 months ago.