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Securely Accessing APIs Using OAuth 2.0

Course Description

In the modern web, many APIs depend on OAuth 2.0 to implement proper access control. Therefore, applications accessing these APIs need to implement support for OAuth 2.0. There are four main OAuth 2.0 flows (and several additional ones), and each supports a particular scenario. In this course, we focus on how to use OAuth 2.0 to access remote APIs. We look at the registration of clients, the different flows, and additional security considerations.

Learning Objectives

Understand how to register a client application and request proper permissions
Select the right OAuth 2.0 flow based on the use case they are handling
Implement an application that uses OAuth 2.0 to access remote APIs
Understand relevant security considerations to protect sensitive tokens

Details

Delivery Format: eLearning

Duration: 1 hour 30 minutes

Level: Intermediate

Intended Audience

Architects
Back-End Developers
Enterprise Developers
Front-End Developers
Mobile Developers

Prerequisites: OAuth 2.0 Security

Course Outline

Introduction

An Example OAuth 2.0 Scenario
Conceptual View of OAuth 2.0
Accessing Protected Resources

Registering a Client Application

The Need for Client Registration
Registering Different Types of Clients
Registering a Client
The Importance of Redirection URIs

Scopes and Permissions

Using Scopes
Handling Scopes in an OAuth 2.0 Flow
Practical Examples of Scopes
Scopes vs. Permissions
The Limitations of Scopes
Practicalities of Scopes

The Client Credentials Grant Flow

Defining the Client Application
Initializing the Flow
Practicalities of the Client Credentials Grant Flow
Limitations and Security Considerations

The Authorization Code Grant Flow

Defining the Client Application
Initializing the Flow
Practicalities of the Authorization Code Grant Flow
Limitations and Security Considerations

The Refresh Token Flow

The Purpose of Refresh Tokens
Using Refresh Tokens
Securing Refresh Tokens for Public Clients
Limitations and Security Considerations

Token Security Recommendations

The Real-World Consequences of Token Theft
Secure Token Storage
Using Sender-Constrained Tokens
The Limitations of Browser-Based Application Security
Using a Backend-for-Frontend Pattern
The Benefits of a BFF

Wrapping Up

The Role of Tokens
The "state" Parameter
Secure Communication Channels

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