A Solution Framework for Private Media in Privacy Enhanced RTP Conferencing
draft-ietf-perc-private-media-framework-04

Document Type Active Internet-Draft (perc WG)
Last updated 2017-07-03
Replaces draft-jones-perc-private-media-framework
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Network Working Group                                           P. Jones
Internet-Draft                                                 D. Benham
Intended status: Standards Track                                   Cisco
Expires: January 4, 2018                                       C. Groves
                                                                  Huawei
                                                            July 3, 2017

     A Solution Framework for Private Media in Privacy Enhanced RTP
                              Conferencing
               draft-ietf-perc-private-media-framework-04

Abstract

   This document describes a solution framework for ensuring that media
   confidentiality and integrity are maintained end-to-end within the
   context of a switched conferencing environment where media
   distribution devices are not trusted with the end-to-end media
   encryption keys.  The solution aims to build upon existing security
   mechanisms defined for the real-time transport protocol (RTP).

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on January 4, 2018.

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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

Jones, et al.            Expires January 4, 2018                [Page 1]
Internet-Draft           Private Media Framework               July 2017

   to this document.  Code Components extracted from this document must
   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   4
   3.  PERC Entities and Trust Model . . . . . . . . . . . . . . . .   5
     3.1.  Untrusted Entities  . . . . . . . . . . . . . . . . . . .   5
       3.1.1.  Media Distributor . . . . . . . . . . . . . . . . . .   6
       3.1.2.  Call Processing . . . . . . . . . . . . . . . . . . .   6
     3.2.  Trusted Entities  . . . . . . . . . . . . . . . . . . . .   7
       3.2.1.  Endpoint  . . . . . . . . . . . . . . . . . . . . . .   7
       3.2.2.  Key Distributor . . . . . . . . . . . . . . . . . . .   7
   4.  Framework for PERC  . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  End-to-End and Hop-by-Hop Authenticated Encryption  . . .   8
     4.2.  E2E Key Confidentiality . . . . . . . . . . . . . . . . .   9
     4.3.  E2E Keys and Endpoint Operations  . . . . . . . . . . . .   9
     4.4.  HBH Keys and Hop Operations . . . . . . . . . . . . . . .  10
     4.5.  Key Exchange  . . . . . . . . . . . . . . . . . . . . . .  10
       4.5.1.  Initial Key Exchange and Key Distributor  . . . . . .  11
       4.5.2.  Key Exchange during a Conference  . . . . . . . . . .  11
   5.  Entity Trust  . . . . . . . . . . . . . . . . . . . . . . . .  12
     5.1.  Identity Assertions . . . . . . . . . . . . . . . . . . .  12
     5.2.  Certificate Fingerprints in Session Signaling . . . . . .  13
     5.3.  Conferences Identification  . . . . . . . . . . . . . . .  13
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
     6.1.  Third Party Attacks . . . . . . . . . . . . . . . . . . .  14
     6.2.  Media Distributor Attacks . . . . . . . . . . . . . . . .  14
       6.2.1.  Denial of service . . . . . . . . . . . . . . . . . .  14
       6.2.2.  Replay Attack . . . . . . . . . . . . . . . . . . . .  15
       6.2.3.  Delayed Playout Attack  . . . . . . . . . . . . . . .  15
       6.2.4.  Splicing Attack . . . . . . . . . . . . . . . . . . .  15
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  16
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
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