The OAuth 2.0 Authorization Framework: JWT Secured Authorization Request (JAR)
draft-ietf-oauth-jwsreq-18

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OAuth Working Group                                          N. Sakimura
Internet-Draft                                 Nomura Research Institute
Intended status: Standards Track                              J. Bradley
Expires: November 17, 2019                                        Yubico
                                                            May 16, 2019

The OAuth 2.0 Authorization Framework: JWT Secured Authorization Request
                                 (JAR)
                       draft-ietf-oauth-jwsreq-18

Abstract

   The authorization request in OAuth 2.0 described in RFC 6749 utilizes
   query parameter serialization, which means that Authorization Request
   parameters are encoded in the URI of the request and sent through
   user agents such as web browsers.  While it is easy to implement, it
   means that (a) the communication through the user agents are not
   integrity protected and thus the parameters can be tainted, and (b)
   the source of the communication is not authenticated.  Because of
   these weaknesses, several attacks to the protocol have now been put
   forward.

   This document introduces the ability to send request parameters in a
   JSON Web Token (JWT) instead, which allows the request to be signed
   with JSON Web Signature (JWS) and encrypted with JSON Web Encryption
   (JWE) so that the integrity, source authentication and
   confidentiality property of the Authorization Request is attained.
   The request can be sent by value or by reference.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   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 November 17, 2019.

Sakimura & Bradley      Expires November 17, 2019               [Page 1]
Internet-Draft                  OAuth JAR                       May 2019

Copyright Notice

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

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   5
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Request Object  . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Request Object URI  . . . . . . . . . . . . . . . . . . .   6
   3.  Symbols and abbreviated terms . . . . . . . . . . . . . . . .   6
   4.  Request Object  . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Authorization Request . . . . . . . . . . . . . . . . . . . .   8
     5.1.  Passing a Request Object by Value . . . . . . . . . . . .   9
     5.2.  Passing a Request Object by Reference . . . . . . . . . .   9
       5.2.1.  URI Referencing the Request Object  . . . . . . . . .  11
       5.2.2.  Request using the "request_uri" Request Parameter . .  11
       5.2.3.  Authorization Server Fetches Request Object . . . . .  11
   6.  Validating JWT-Based Requests . . . . . . . . . . . . . . . .  12
     6.1.  Encrypted Request Object  . . . . . . . . . . . . . . . .  12
     6.2.  JWS Signed Request Object . . . . . . . . . . . . . . . .  13
     6.3.  Request Parameter Assembly and Validation . . . . . . . .  13
   7.  Authorization Server Response . . . . . . . . . . . . . . . .  13
   8.  TLS Requirements  . . . . . . . . . . . . . . . . . . . . . .  13
   9.  IANA  Considerations  . . . . . . . . . . . . . . . . . . . .  14
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  14
     10.1.  Choice of Algorithms . . . . . . . . . . . . . . . . . .  14
     10.2.  Request Source Authentication  . . . . . . . . . . . . .  15
     10.3.  Explicit Endpoints . . . . . . . . . . . . . . . . . . .  15
     10.4.  Risks Associated with request_uri  . . . . . . . . . . .  16
       10.4.1.  DDoS Attack on the Authorization Server  . . . . . .  16