OAuth 2.0 Assisted Token
draft-ideskog-assisted-token-02

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Independent Submission                                        J. Ideskog
Internet-Draft                                                T. Spencer
Intended status: Informational                                 Curity AB
Expires: 22 November 2020                                    21 May 2020

                        OAuth 2.0 Assisted Token
                    draft-ideskog-assisted-token-02

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.

Note

   To contribute to this draft, please feel free to create a pull
   request from the original source available at
   https://bitbucket.org/curity/rfc/ (https://bitbucket.org/curity/rfc/)
   or email the authors.

   This note is to be removed before publishing as an RFC.

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 22 November 2020.

Ideskog & Spencer       Expires 22 November 2020                [Page 1]
Internet-Draft               Assisted Token                     May 2020

Copyright Notice

   Copyright (c) 2020 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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Assisted Token Endpoint . . . . . . . . . . . . . . . . . . .   6
     3.1.  Access Token Scope  . . . . . . . . . . . . . . . . . . .   7
     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  . . . . . . . . . . . . . . . . . . . . .   9
   5.  Client Metadata . . . . . . . . . . . . . . . . . . . . . . .  11
   6.  Authorization Server Metadata . . . . . . . . . . . . . . . .  11
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     7.1.  OAuth URI Registration  . . . . . . . . . . . . . . . . .  12
       7.1.1.  Registry Contents . . . . . . . . . . . . . . . . . .  12
     7.2.  OAuth Parameters  . . . . . . . . . . . . . . . . . . . .  12
       7.2.1.  Registry Contents . . . . . . . . . . . . . . . . . .  12
     7.3.  OAuth 2.0 Authorization Server Metadata . . . . . . . . .  12
       7.3.1.  Registry Contents . . . . . . . . . . . . . . . . . .  12
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
     8.1.  Framing . . . . . . . . . . . . . . . . . . . . . . . . .  13
     8.2.  Handle Tokens . . . . . . . . . . . . . . . . . . . . . .  14
     8.3.  Warning Against Untrusted Scripts . . . . . . . . . . . .  14
     8.4.  Origin of Event and Authorization Server  . . . . . . . .  15
     8.5.  Token Storage . . . . . . . . . . . . . . . . . . . . . .  15
     8.6.  Visibility of User Agent's Address Bar  . . . . . . . . .  16
   9.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  16
   10. Normative References  . . . . . . . . . . . . . . . . . . . .  16
   11. Informative References  . . . . . . . . . . . . . . . . . . .  17
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .  18
   Appendix B.  Document History . . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

Ideskog & Spencer       Expires 22 November 2020                [Page 2]
Internet-Draft               Assisted Token                     May 2020