Best Practices for Securing RTP Media Signaled with SIP
draft-ietf-sipbrandy-rtpsec-02

Document Type Active Internet-Draft (sipbrandy WG)
Last updated 2017-03-13
Replaces draft-peterson-sipbrandy-rtpsec
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Network Working Group                                        J. Peterson
Internet-Draft                                                   Neustar
Intended status: Best Current Practice                       E. Rescorla
Expires: September 14, 2017                                    R. Barnes
                                                                 Mozilla
                                                              R. Housley
                                                                Vigilsec
                                                          March 13, 2017

        Best Practices for Securing RTP Media Signaled with SIP
                   draft-ietf-sipbrandy-rtpsec-02.txt

Abstract

   Although the Session Initiation Protocol (SIP) includes a suite of
   security services that has been expanded by numerous specifications
   over the years, there is no single place that explains how to use SIP
   to establish confidential media sessions.  Additionally, existing
   mechanisms have some feature gaps that need to be identified and
   resolved in order for them to address the pervasive monitoring threat
   model.  This specification describes best practices for negotiating
   confidential media with SIP, including both comprehensive protection
   solutions which bind the media to SIP-layer identities as well as
   opportunistic security solutions.

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 September 14, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Peterson, et al.       Expires September 14, 2017               [Page 1]
Internet-Draft                RTP Security                    March 2017

   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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Security at the SIP and SDP layer . . . . . . . . . . . . . .   3
     3.1.  Comprehensive Protection  . . . . . . . . . . . . . . . .   3
     3.2.  Opportunistic Security  . . . . . . . . . . . . . . . . .   4
   4.  STIR Profile for Endpoint Authentication and Verification
       Services  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Credentials . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Anonymous Communications  . . . . . . . . . . . . . . . .   6
     4.3.  Connected Identity Usage  . . . . . . . . . . . . . . . .   7
     4.4.  Authorization Decisions . . . . . . . . . . . . . . . . .   8
   5.  Media Security Protocols  . . . . . . . . . . . . . . . . . .   8
   6.  Relayed Media and Conferencing  . . . . . . . . . . . . . . .   9
   7.  ICE and Connected Identity  . . . . . . . . . . . . . . . . .   9
   8.  Best Current Practices  . . . . . . . . . . . . . . . . . . .  10
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   12. Informative References  . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   The Session Initiation Protocol (SIP) [RFC3261] includes a suite of
   security services, ranging from Digest authentication for
   authenticating entities with a shared secret, to TLS for transport
   security, to S/MIME (optionally) for body security.  SIP is
   frequently used to establish media sessions, in particular audio or
   audiovisual sessions, which have their own security mechanisms
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