DTLS Tunnel between a Media Distributor and Key Distributor to Facilitate Key Exchange
draft-ietf-perc-dtls-tunnel-00

Document Type Active Internet-Draft (perc WG)
Last updated 2017-03-13
Replaces draft-jones-perc-dtls-tunnel
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Network Working Group                                           P. Jones
Internet-Draft                                             Cisco Systems
Intended status: Standards Track                           P. Ellenbogen
Expires: September 13, 2017                         Princeton University
                                                             N. Ohlmeier
                                                                 Mozilla
                                                          March 12, 2017

     DTLS Tunnel between a Media Distributor and Key Distributor to
                        Facilitate Key Exchange
                     draft-ietf-perc-dtls-tunnel-00

Abstract

   This document defines a DTLS tunneling protocol for use in multimedia
   conferences that enables a Media Distributor to facilitate key
   exchange between an endpoint in a conference and the Key Distributor.
   The protocol is designed to ensure that the keying material used for
   hop-by-hop encryption and authentication is accessible to the media
   distributor, while the keying material used for end-to-end encryption
   and authentication is inaccessible to the media distributor.

Status of This Memo

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   This Internet-Draft will expire on September 13, 2017.

Copyright Notice

   Copyright (c) 2017 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

Jones, et al.          Expires September 13, 2017               [Page 1]
Internet-Draft            DTLS Tunnel for PERC                March 2017

   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used In This Document . . . . . . . . . . . . . .   3
   3.  Tunneling Concept . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Example Message Flows . . . . . . . . . . . . . . . . . . . .   4
   5.  Tunneling Procedures  . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Endpoint Procedures . . . . . . . . . . . . . . . . . . .   6
     5.2.  Tunnel Establishment Procedures . . . . . . . . . . . . .   6
     5.3.  Versioning Considerations . . . . . . . . . . . . . . . .   7
     5.4.  Media Distributor Tunneling Procedures  . . . . . . . . .   7
     5.5.  Key Distributor Tunneling Procedures  . . . . . . . . . .   9
   6.  Tunneling Protocol  . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  Tunnel Message Format . . . . . . . . . . . . . . . . . .  10
   7.  Example Binary Encoding . . . . . . . . . . . . . . . . . . .  13
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  14
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  15
     11.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   An objective of Privacy-Enhanced RTP Conferencing (PERC) is to ensure
   that endpoints in a multimedia conference have access to the end-to-
   end (E2E) and hop-by-hop (HBH) keying material used to encrypt and
   authenticate Real-time Transport Protocol (RTP) [RFC3550] packets,
   while the Media Distributor has access only to the hop-by-hop (HBH)
   keying material for encryption and authentication.

   This specification defines a tunneling protocol that enables the
   media distributor to tunnel DTLS [RFC6347] messages between an
   endpoint and the key distributor, thus allowing an endpoint to use
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