Session Traversal Utilities for NAT (STUN) Extension for Third-Party Authorization
RFC 7635
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
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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
for making real-time audio and/or video calls, web conferencing, and
direct data transfer, ensuring this secrecy is typically not
possible.
To address this problem and the ones described in [RFC7376], this
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