An Opportunistic Approach for Secure Real-time Transport Protocol (OSRTP)
draft-ietf-sipbrandy-osrtp-05

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Last updated 2018-09-14
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SIPBRANDY Working Group                                      A. Johnston
Internet-Draft                                          Rowan University
Intended status: Informational                                  B. Aboba
Expires: March 18, 2019                                        Microsoft
                                                               A. Hutton
                                                                    Atos
                                                               R. Jesske
                                                        Deutsche Telekom
                                                                T. Stach
                                                            Unaffiliated
                                                      September 14, 2018

   An Opportunistic Approach for Secure Real-time Transport Protocol
                                (OSRTP)
                     draft-ietf-sipbrandy-osrtp-05

Abstract

   Opportunistic Secure Real-time Transport Protocol (OSRTP) is an
   implementation of the Opportunistic Security mechanism, as defined in
   RFC 7435, applied to Real-time Transport Protocol (RTP).  OSRTP
   allows encrypted media to be used in environments where support for
   encryption is not known in advance, and not required.  OSRTP does not
   require SDP extensions or features and is fully backwards compatible
   with existing implementations using encrypted and authenticated media
   and implementations that do not encrypt or authenticate media
   packets.  OSRTP is not specific to any key management technique for
   SRTP.  OSRTP is a transitional approach useful for migrating existing
   deployments of real-time communications to a fully encrypted and
   authenticated state.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on March 18, 2019.

Johnston, et al.         Expires March 18, 2019                 [Page 1]
Internet-Draft                    OSRTP                   September 2018

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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Applicability Statement . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  SDP Offer/Answer Considerations . . . . . . . . . . . . . . .   3
     3.1.  Generating the Initial OSRTP Offer  . . . . . . . . . . .   4
     3.2.  Generating the Answer . . . . . . . . . . . . . . . . . .   4
     3.3.  Offerer Processing the Answer . . . . . . . . . . . . . .   4
     3.4.  Modifying the Session . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   5.  Implementation Status . . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Opportunistic Security [RFC7435] (OS) is an approach to security that
   defines a third mode for security between "cleartext" and
   "comprehensive protection" that allows encryption and authentication
   to be used if supported but will not result in failures if it is not
   supported.  In terms of secure media, cleartext is RTP [RFC3550]
   media which is negotiated with the RTP/AVP (Audio Video Profile)
   profile defined [RFC3551].  Comprehensive protection is Secure RTP
   [RFC3711], negotiated with a secure profile, such as SAVP or SAVPF
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