Session Traversal Utilities for NAT (STUN) Extension for Third-Party Authorization
RFC 7635

Document Type RFC - Proposed Standard (August 2015; Errata)
Last updated 2016-10-12
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Stream WG state Submitted to IESG for Publication Mar 2016
Document shepherd Gonzalo Camarillo
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IESG IESG state RFC 7635 (Proposed Standard)
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IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                          T. Reddy
Request for Comments: 7635                                      P. Patil
Category: Standards Track                                R. Ravindranath
ISSN: 2070-1721                                                    Cisco
                                                               J. Uberti
                                                                  Google
                                                             August 2015

          Session Traversal Utilities for NAT (STUN) Extension
                     for Third-Party Authorization

Abstract

   This document proposes the use of OAuth 2.0 to obtain and validate
   ephemeral tokens that can be used for Session Traversal Utilities for
   NAT (STUN) authentication.  The usage of ephemeral tokens ensures
   that access to a STUN server can be controlled even if the tokens are
   compromised.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7635.

Copyright Notice

   Copyright (c) 2015 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
   (http://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.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Reddy, et al.                Standards Track                    [Page 1]
RFC 7635           STUN for Third-Party Authorization        August 2015

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Solution Overview . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Usage with TURN . . . . . . . . . . . . . . . . . . . . .   4
   4.  Obtaining a Token Using OAuth . . . . . . . . . . . . . . . .   7
     4.1.  Key Establishment . . . . . . . . . . . . . . . . . . . .   8
       4.1.1.  HTTP Interactions . . . . . . . . . . . . . . . . . .   8
       4.1.2.  Manual Provisioning . . . . . . . . . . . . . . . . .  10
   5.  Forming a Request . . . . . . . . . . . . . . . . . . . . . .  10
   6.  STUN Attributes . . . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  THIRD-PARTY-AUTHORIZATION . . . . . . . . . . . . . . . .  10
     6.2.  ACCESS-TOKEN  . . . . . . . . . . . . . . . . . . . . . .  11
   7.  STUN Server Behavior  . . . . . . . . . . . . . . . . . . . .  13
   8.  STUN Client Behavior  . . . . . . . . . . . . . . . . . . . .  14
   9.  TURN Client and Server Behavior . . . . . . . . . . . . . . .  14
   10. Operational Considerations  . . . . . . . . . . . . . . . . .  15
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  15
   12. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
     12.1.  Well-Known 'stun-key' URI  . . . . . . . . . . . . . . .  16
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  16
     13.2.  Informative References . . . . . . . . . . . . . . . . .  17
   Appendix A.  Sample Tickets . . . . . . . . . . . . . . . . . . .  20
   Appendix B.  Interaction between the Client and Authorization
                Server . . . . . . . . . . . . . . . . . . . . . . .  22
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  24
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  24

1.  Introduction

   Session Traversal Utilities for NAT (STUN) [RFC5389] provides a
   mechanism to control access via 'long-term' username/password
   credentials that are provided as part of the STUN protocol.  It is
   expected that these credentials will be kept secret; if the
   credentials are discovered, the STUN server could be used by
   unauthorized users or applications.  However, in web applications
   like WebRTC [WEBRTC] where JavaScript uses the browser functionality
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