Problems with STUN Authentication for TURN
draft-ietf-tram-auth-problems-00

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BEHAVE                                                          T. Reddy
Internet-Draft                                         Ram. Ravindranath
Intended status: Informational                            Muthu. Perumal
Expires: September 25, 2014                                        Cisco
                                                                A. Yegin
                                                                 Samsung
                                                          March 24, 2014

               Problems with STUN Authentication for TURN
                    draft-ietf-tram-auth-problems-00

Abstract

   This document discusses some of the issues with STUN authentication
   for TURN messages.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on September 25, 2014.

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

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Internet-Draft Problems with STUN Authentication for TURN     March 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Notational Conventions  . . . . . . . . . . . . . . . . . . .   3
   3.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Problems with usage of STUN Authentication  . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The TURN server is a building block to support interactive, real-time
   communication using audio, video, collaboration, games, etc., between
   two peer web browsers using the Web Real-Time communication (WebRTC)
   [I-D.ietf-rtcweb-overview] framework.  The use-case explained in
   "Simple Video Communication Service, enterprise aspects"
   (Section 3.2.5 of [I-D.ietf-rtcweb-use-cases-and-requirements])
   refers to deploying a TURN[RFC5766] server in the DMZ to audit all
   media sessions from inside an Enterprise premises to any external
   peer.  TURN server could also be deployed for RTP Mobility
   [I-D.wing-mmusic-ice-mobility] etc.

   TURN server is also used in the following scenarios:

   o  Users of RTCWEB based web application may use TURN server to hide
      host candidate addresses from the remote peer for privacy.

   o  Enterprise networks deploy firewalls which typically block UDP
      traffic.  When SIP user agents or WebRTC endpoints are deployed
      behind such firewalls, media cannot be sent over UDP across the
      firewall, but must be sent using TCP (which causes a different
      user experience).  In such cases a TURN server deployed in the DMZ
      MAY be used to traverse Firewalls.

   o  TURN Server may be used for IPv4-to-IPv6, IPv6-to-IPv6, and IPv6
      -to-IPv4 relaying [RFC6156].

   o  ICE connectivity checks using server-reflexive candidates could
      fail when the endpoint is behind NAT that performs Address-
      dependent mapping.  In such cases relayed candidate allocated from
      the TURN server is used for media.

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   STUN [RFC5389] specifies an authentication mechanism called the long-
   term credential mechanism.  TURN [RFC5766] in section 4 specifies
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