OAuth 2.0 Assisted Token
draft-ideskog-assisted-token-01

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Independent Submission                                        J. Ideskog
Internet-Draft                                                T. Spencer
Intended status: Informational                                 Curity AB
Expires: 27 May 2020                                    24 November 2019

                        OAuth 2.0 Assisted Token
                    draft-ideskog-assisted-token-01

Abstract

   This document extends the OAuth 2.0 framework to include an
   additional authorization flow for single page applications called the
   assisted token flow.  It enables OAuth clients written in scripting
   languages, like JavaScript, to request user authorization using a
   simplified method compared to other flows.  Communication does not
   rely on redirection of the user agent, but instead leverages HTML's
   iframe element, child windows, and the postMessage interface.  This
   communication is done using an additional endpoint, the assisted
   token endpoint.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 27 May 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.

Ideskog & Spencer          Expires 27 May 2020                  [Page 1]
Internet-Draft               Assisted Token                November 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Assisted Token Endpoint . . . . . . . . . . . . . . . . . . .   5
     3.1.  Access Token Scope  . . . . . . . . . . . . . . . . . . .   6
     3.2.  Cross-Origin Support  . . . . . . . . . . . . . . . . . .   7
   4.  Protocol  . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Assisted Token Request  . . . . . . . . . . . . . . . . .   7
     4.2.  Assisted Token Response . . . . . . . . . . . . . . . . .   8
     4.3.  Error Response  . . . . . . . . . . . . . . . . . . . . .   8
   5.  Client Metadata . . . . . . . . . . . . . . . . . . . . . . .  10
   6.  Authorization Server Metadata . . . . . . . . . . . . . . . .  10
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
     7.1.  OAuth URI Registration  . . . . . . . . . . . . . . . . .  11
       7.1.1.  Registry Contents . . . . . . . . . . . . . . . . . .  11
     7.2.  OAuth 2.0 Authorization Server Metadata . . . . . . . . .  11
       7.2.1.  Registry Contents . . . . . . . . . . . . . . . . . .  11
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
     8.1.  Framing . . . . . . . . . . . . . . . . . . . . . . . . .  12
     8.2.  Handle Tokens . . . . . . . . . . . . . . . . . . . . . .  13
     8.3.  Warning Against Untrusted Scripts . . . . . . . . . . . .  13
     8.4.  Origin of Event and Authorization Server  . . . . . . . .  13
     8.5.  Token Storage . . . . . . . . . . . . . . . . . . . . . .  14
     8.6.  Visibility of User Agent's Address Bar  . . . . . . . . .  14
   9.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  15
   10. Normative References  . . . . . . . . . . . . . . . . . . . .  15
   11. Informative References  . . . . . . . . . . . . . . . . . . .  16
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .  17
   Appendix B.  Document History . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   The OAuth 2.0 protocol flow for Single-page Applications (SPA)
   defined in this memo, often referred to as the assisted token flow,
   provides clients written in scripting languages, like JavaScript,
   with a simplified integration (compared to the implicit or
   authorization code flow) and ensures that end users are not
   redirected away from the current page in order to obtain
   authorization from the resource owner.  The communication between the
   client and the authorization server takes place within an HTML iframe