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Securely Granting Access to an API Using OAuth 2.0

Course Description

Modern web applications are often backed by an API. These APIs depend on OAuth 2.0 to implement access control. Since OAuth 2.0 is a delegation framework, implementing access control is not as simple as it seems. In this course, we look at the architecture of a back-end application using OAuth 2.0, and investigate the security properties of various kinds of access tokens. We also look at the importance of token introspection, and how to use that data to make access control decisions.

Learning Objectives

Understand the difference between the types of access tokens
Understand the role of a token introspection endpoint
Define a custom set of scopes for fine-grained access control
Secure access to an API using OAuth 2.0
Avoid common pitfalls when designing OAuth 2.0-based security architectures

Details

Delivery: eLearning

Duration: 1 hour 30 minutes

Level: Intermediate

Intended Audience

Architects
Back-End Developers
Enterprise Developers

Prerequisites

OAuth 2.0 Security

Course Outline

Introduction

Examples of Protected Resources
The Complexity of OAuth 2.0

Authentication, Authorization, and OAuth 2.0

API Security Based on OAuth 2.0
The Relationship Between Authentication, Authorization, and OAuth 2.0
Current Best Practice OAuth 2.0 Flows

Different Access Token Types

Different Types of Access Tokens
Reference Tokens
Self-Contained Tokens
Considerations for Choosing a Token Type

Handling Incoming Access Tokens

Getting the Access Token from the Request
Introspecting Reference Tokens
Verifying Self-Contained Tokens
Security Considerations

Restricting Access Using Well-Defined Scopes

The Purpose of Scopes
Using Scopes for Authorization
Practical Use of Scopes

Implementing Access Control Using OAuth 2.0

Requiring Authorization on API Endpoints
Getting the Access Token
Differentiating Between Token Types
Handling Self-Contained Tokens
Handling Reference Tokens
Putting It All Together
Checking Access Token Scopes
Making Object-Level Authorization Decisions

Token Handling Pitfalls and Best Practices

The Purpose of Tokens
Custom Token Claims
Roles and Permissions in Tokens

More Advanced Topics

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