Recursively Encapsulated TURN (RETURN) for Connectivity and Privacy in WebRTC
draft-schwartz-rtcweb-return-04

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Document Type Active Internet-Draft (individual)
Authors Benjamin Schwartz  , Justin Uberti 
Last updated 2014-11-10
Replaced by draft-ietf-rtcweb-return
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Network Working Group                                        B. Schwartz
Internet-Draft                                                 J. Uberti
Intended status: Standards Track                                  Google
Expires: May 14, 2015                                  November 10, 2014

 Recursively Encapsulated TURN (RETURN) for Connectivity and Privacy in
                                 WebRTC
                    draft-schwartz-rtcweb-return-04

Abstract

   In the context of WebRTC, the concept of a local TURN proxy has been
   suggested, but not reviewed in detail.  WebRTC applications are
   already using TURN to enhance connectivity and privacy.  This
   document explains how local TURN proxies and WebRTC applications can
   work together.

Status of This Memo

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   This Internet-Draft will expire on May 14, 2015.

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   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Schwartz & Uberti         Expires May 14, 2015                  [Page 1]
Internet-Draft                   RETURN                    November 2014

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Goals . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Connectivity  . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Privacy . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Concepts  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Proxy . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Virtual interface . . . . . . . . . . . . . . . . . . . .   5
     3.3.  Proxy configuration leakiness . . . . . . . . . . . . . .   5
     3.4.  Sealed proxy rank . . . . . . . . . . . . . . . . . . . .   5
   4.  Diagrams  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  ICE candidates produced in the presence of a proxy  . . .   7
     5.2.  Leaky proxy configuration . . . . . . . . . . . . . . . .   8
     5.3.  Sealed proxy configuration  . . . . . . . . . . . . . . .   8
     5.4.  Proxy rank  . . . . . . . . . . . . . . . . . . . . . . .   8
     5.5.  Multiple physical interfaces  . . . . . . . . . . . . . .   8
     5.6.  IPv4 and IPv6 . . . . . . . . . . . . . . . . . . . . . .   8
     5.7.  Unspecified leakiness . . . . . . . . . . . . . . . . . .   9
     5.8.  Interaction with SOCKS5-UDP . . . . . . . . . . . . . . .   9
     5.9.  Encapsulation overhead, fragmentation, and Path MTU . . .   9
     5.10. Interaction with alternate TURN server fallback . . . . .  10
   6.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  Firewalled enterprise network with a basic application  .  10
     6.2.  Conflicting proxies configured by Auto-Discovery and
           local           policy  . . . . . . . . . . . . . . . . .  11
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     10.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   TURN [RFC5766] is a protocol for communication between a client and a
   TURN server, in order to route UDP traffic to and from one or more
   peers.  As noted in [RFC5766], the TURN relay server "typically sits
   in the public Internet".  In a WebRTC context, if a TURN server is to
   be used, it is typically provided by the application, either to
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