9. Enabling Cross-Origin Resource Sharing (CORS) in ASP.NET Web API | ASP.NET Web API Security Essentials

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ASP.NET Web API Security Essentials

By : Gunasundaram

2.3 (3)

ASP.NET Web API Security Essentials

2.3 (3)

By: Gunasundaram

Overview of this book

This book incorporates the new features of ASP.NET Web API 2 that will help you to secure an ASP.NET Web API and make a well-informed decision when choosing the right security mechanism for your security requirements. We start by showing you how to set up a browser client to utilize ASP.NET Web API services. We then cover ASP.NET Web API’s security architecture, authentication, and authorization to help you secure a web API from unauthorized users. Next, you will learn how to use SSL with ASP.NET Web API, including using SSL client certificates, and integrate the ASP.NET Identity system with ASP.NET Web API. We’ll show you how to secure a web API using OAuth2 to authenticate against a membership database using OWIN middleware. You will be able to use local logins to send authenticated requests using OAuth2. We also explain how to secure a web API using forms authentication and how users can log in with their Windows credentials using integrated Windows authentication. You will come to understand the need for external authentication services to enable OAuth/OpenID and social media authentication. We’ll then help you implement anti-Cross-Site Request Forgery (CSRF) measures in ASP.NET Web API. Finally, you will discover how to enable Cross-Origin Resource Sharing (CORS) in your web API application.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Reader feedback

Customer support

Free Chapter

1. Setting up a Browser Client

1. Setting up a Browser Client

ASP.NET Web API security architecture

Setting up your browser client

Authentication and authorization

Implementing authentication in HTTP message handlers

Setting the principal

Using the [Authorize] attribute

Custom authorization filters

Authorization inside a controller action

Summary

2. Enabling SSL for ASP.NET Web API

2. Enabling SSL for ASP.NET Web API

Enforcing SSL in a Web API controller

Using client certificates in Web API

Summary

3. Integrating ASP.NET Identity System with Web API

3. Integrating ASP.NET Identity System with Web API

Creating an Empty Web API Application

Installing the ASP.NET Identity NuGet packages

Setting up ASP.NET Identity 2.1

Defining Web API Controllers and methods

Summary

4. Securing Web API Using OAuth2

4. Securing Web API Using OAuth2

Hosting OWIN in IIS and adding Web API to the OWIN pipeline

Individual User Account authentication flow

Sending an unauthorized request

Get an access token

Send an authenticated request

Summary

5. Enabling Basic Authentication using Authentication Filter in Web API

5. Enabling Basic Authentication using Authentication Filter in Web API

Basic authentication with IIS

Basic authentication with custom membership

Basic authentication using an authentication filter

Setting an authentication filter

Implementing a Web API authentication filter

Setting an error result

Combining authentication filters with host-level authentication

Summary

6. Securing a Web API using Forms and Windows Authentication

6. Securing a Web API using Forms and Windows Authentication

Working of Forms authentication

Implementing Forms authentication in Web API

What is Integrated Windows Authentication?

Advantages and disadvantages of using the Integrated Windows Authentication mechanism

Configuring Windows Authentication

Difference between Basic Authentication and Windows authentication

Enabling Windows authentication in Katana

Summary

7. Using External Authentication Services with ASP.NET Web API

7. Using External Authentication Services with ASP.NET Web API

Using OWIN external authentication services

Implementing Facebook authentication

Implementing Twitter authentication

Implementing Google authentication

Implementing Microsoft authentication

Discussing authentication

Summary

8. Avoiding Cross-Site Request Forgery Attacks in Web API

8. Avoiding Cross-Site Request Forgery Attacks in Web API

What is a CSRF attack?

Anti-forgery tokens using HTML Form or Razor View

Anti-forgery tokens using AJAX

Summary

9. Enabling Cross-Origin Resource Sharing (CORS) in ASP.NET Web API

9. Enabling Cross-Origin Resource Sharing (CORS) in ASP.NET Web API

What is CORS?

How CORS works

Setting the allowed origins

Setting the allowed HTTP methods

Setting the allowed request headers

Setting the allowed response headers

Passing credentials in cross-origin requests

Enabling CORS at various scope

Summary

Index

Index

Passing credentials in cross-origin requests

Browsers don't pass credentials such as cookies and HTTP authentication schemes by default in cross-origin requests. To enable passing credentials in cross-origin requests from the client, the client has to set XMLHttpRequest.withCredentials to true as given in the following:

$.ajax({
    type: 'get',
    url: ' http://localhost:53858 /api/contacts,
    xhrFields: {
        withCredentials: true
    }

To allow credentials in cross-origin requests, the SupportsCredentials property should be set to true on the [EnableCors] attribute as given in the following code:

[EnableCors(origins: "http://chapter09client.com", headers: "*", methods: "*", SupportsCredentials = true)]

The HTTP response will also have the Access-Control-Allow-Credentials header, to indicate to the browser that the server is fine to accept credentials in cross-origin requests. Using Cookie or Authorization header, Web API authenticates the request. Once authenticated, the browser will...

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