DTLS Tunnel between a Media Distributor and Key Distributor to Facilitate Key Exchange
draft-ietf-perc-dtls-tunnel-02
Network Working Group P. Jones
Internet-Draft Cisco Systems
Intended status: Standards Track P. Ellenbogen
Expires: May 3, 2018 Princeton University
N. Ohlmeier
Mozilla
October 30, 2017
DTLS Tunnel between a Media Distributor and Key Distributor to
Facilitate Key Exchange
draft-ietf-perc-dtls-tunnel-02
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 May 3, 2018.
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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. Media Distributor Tunneling Procedures . . . . . . . . . 7
5.4. Key Distributor Tunneling Procedures . . . . . . . . . . 8
5.5. Versioning Considerations . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
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
DTLS-SRTP [RFC5764] for establishing encryption and authentication
keys with the key distributor.
The tunnel established between the media distributor and key
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