A Solution Framework for Private Media in Privacy Enhanced RTP Conferencing
draft-ietf-perc-private-media-framework-07

Document Type Active Internet-Draft (perc WG)
Last updated 2018-10-22 (latest revision 2018-09-03)
Replaces draft-jones-perc-private-media-framework
Stream IETF
Intended RFC status Proposed Standard
Formats plain text xml pdf html bibtex
Stream WG state Submitted to IESG for Publication
Document shepherd Nils Ohlmeier
Shepherd write-up Show (last changed 2018-09-20)
IESG IESG state AD Evaluation::Revised I-D Needed
Consensus Boilerplate Yes
Telechat date
Responsible AD Ben Campbell
Send notices to Nils Ohlmeier <nohlmeier@mozilla.com>
Network Working Group                                           P. Jones
Internet-Draft                                                     Cisco
Intended status: Standards Track                               D. Benham
Expires: March 8, 2019                                         C. Groves
                                                             Independent
                                                       September 4, 2018

     A Solution Framework for Private Media in Privacy Enhanced RTP
                              Conferencing
               draft-ietf-perc-private-media-framework-07

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
   distributors 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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 8, 2019.

Copyright Notice

   Copyright (c) 2018 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
   (https://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 March 8, 2019                 [Page 1]
Internet-Draft           Private Media Framework          September 2018

   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  . . . . . . . . . .  12
   5.  Authentication  . . . . . . . . . . . . . . . . . . . . . . .  13
     5.1.  Identity Assertions . . . . . . . . . . . . . . . . . . .  13
     5.2.  Certificate Fingerprints in Session Signaling . . . . . .  13
     5.3.  Conferences Identification  . . . . . . . . . . . . . . .  14
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
     6.1.  Third Party Attacks . . . . . . . . . . . . . . . . . . .  14
     6.2.  Media Distributor Attacks . . . . . . . . . . . . . . . .  15
       6.2.1.  Denial of service . . . . . . . . . . . . . . . . . .  15
       6.2.2.  Replay Attack . . . . . . . . . . . . . . . . . . . .  16
       6.2.3.  Delayed Playout Attack  . . . . . . . . . . . . . . .  16
       6.2.4.  Splicing Attack . . . . . . . . . . . . . . . . . . .  16
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  17
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  17
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  17
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