OAuth 2.0 for Browser-Based Apps
draft-ietf-oauth-browser-based-apps-06
Open Authentication Protocol A. Parecki
Internet-Draft Okta
Intended status: Best Current Practice D. Waite
Expires: October 7, 2020 Ping Identity
April 05, 2020
OAuth 2.0 for Browser-Based Apps
draft-ietf-oauth-browser-based-apps-06
Abstract
This specification details the security considerations and best
practices that must be taken into account when developing browser-
based applications that use OAuth 2.0.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on October 7, 2020.
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Parecki & Waite Expires October 7, 2020 [Page 1]
Internet-Draft OAuth 2.0 for Browser-Based Apps April 2020
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Notational Conventions . . . . . . . . . . . . . . . . . . . 3
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5. First-Party Applications . . . . . . . . . . . . . . . . . . 4
6. Application Architecture Patterns . . . . . . . . . . . . . . 5
6.1. Browser-Based Apps that Can Share Data with the Resource
Server . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.2. JavaScript Applications with a Backend . . . . . . . . . 6
6.3. JavaScript Applications without a Backend . . . . . . . . 8
7. Authorization Code Flow . . . . . . . . . . . . . . . . . . . 9
7.1. Initiating the Authorization Request from a Browser-Based
Application . . . . . . . . . . . . . . . . . . . . . . . 10
7.2. Handling the Authorization Code Redirect . . . . . . . . 10
8. Refresh Tokens . . . . . . . . . . . . . . . . . . . . . . . 10
9. Security Considerations . . . . . . . . . . . . . . . . . . . 11
9.1. Registration of Browser-Based Apps . . . . . . . . . . . 12
9.2. Client Authentication . . . . . . . . . . . . . . . . . . 12
9.3. Client Impersonation . . . . . . . . . . . . . . . . . . 12
9.4. Cross-Site Request Forgery Protections . . . . . . . . . 13
9.5. Authorization Server Mix-Up Mitigation . . . . . . . . . 13
9.6. Cross-Domain Requests . . . . . . . . . . . . . . . . . . 13
9.7. Content-Security Policy . . . . . . . . . . . . . . . . . 14
9.8. OAuth Implicit Flow . . . . . . . . . . . . . . . . . . . 14
9.8.1. Attacks on the Implicit Flow . . . . . . . . . . . . 14
9.8.2. Countermeasures . . . . . . . . . . . . . . . . . . . 15
9.8.3. Disadvantages of the Implicit Flow . . . . . . . . . 15
9.8.4. Historic Note . . . . . . . . . . . . . . . . . . . . 16
9.9. Additional Security Considerations . . . . . . . . . . . 17
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 17
11.1. Normative References . . . . . . . . . . . . . . . . . . 17
11.2. Informative References . . . . . . . . . . . . . . . . . 18
Appendix A. Server Support Checklist . . . . . . . . . . . . . . 18
Appendix B. Document History . . . . . . . . . . . . . . . . . . 18
Appendix C. Acknowledgements . . . . . . . . . . . . . . . . . . 20
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 21
1. Introduction
This specification describes the current best practices for
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