Firewall Traversal for WebRTC
draft-jennings-behave-rtcweb-firewall-03

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rtcweb                                                          P. Patel
Internet-Draft                                               C. Jennings
Intended status: Informational                             S. Nandakumar
Expires: April 20, 2016                                     J. Rosenberg
                                                                 D. Wing
                                                                   Cisco
                                                        October 18, 2015

                     Firewall Traversal for WebRTC
                draft-jennings-behave-rtcweb-firewall-03

Abstract

   Traversal of RTP through corporate firewalls has traditionally been
   complex, requiring the deployment of Session Border Controllers
   (SBCs) or wide open pinholes.  This draft proposes a simple technique
   that allows WebRTC based RTP traffic to traverse firewalls without
   complex firewall configuration and without deployment of SBCs or
   other middleboxes.

Status of This Memo

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   This Internet-Draft will expire on April 20, 2016.

Copyright Notice

   Copyright (c) 2015 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
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   carefully, as they describe your rights and restrictions with respect

Patel, et al.            Expires April 20, 2016                 [Page 1]
Internet-Draft               WebRTC Firewall                October 2015

   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
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Table of Contents

   1.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Solution Requirements . . . . . . . . . . . . . . . . . . . .   4
   3.  Solution Overview . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Firewall Processing . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   6
     4.2.  Recognizing STUN packets  . . . . . . . . . . . . . . . .   6
     4.3.  Application Mapping . . . . . . . . . . . . . . . . . . .   7
     4.4.  Policy decision . . . . . . . . . . . . . . . . . . . . .   7
     4.5.  Creating the pinhole rules  . . . . . . . . . . . . . . .   8
     4.6.  Media vs Data Statistics  . . . . . . . . . . . . . . . .   8
   5.  WebRTC Browsers . . . . . . . . . . . . . . . . . . . . . . .   9
   6.  STUN HOST attribute . . . . . . . . . . . . . . . . . . . . .   9
   7.  Deployment Advice . . . . . . . . . . . . . . . . . . . . . .  10
     7.1.  WebRTC Servers  . . . . . . . . . . . . . . . . . . . . .  10
     7.2.  Firewall Admins . . . . . . . . . . . . . . . . . . . . .  10
   8.  Design Consideration  . . . . . . . . . . . . . . . . . . . .  10
     8.1.  Why not just use TCP? . . . . . . . . . . . . . . . . . .  10
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  11
     10.1.  Privacy  . . . . . . . . . . . . . . . . . . . . . . . .  11
   11. Alternate Approaches  . . . . . . . . . . . . . . . . . . . .  11
     11.1.  SDN Control of Firewall  . . . . . . . . . . . . . . . .  11
     11.2.  Any Cast White List  . . . . . . . . . . . . . . . . . .  12
   12. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     13.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Problem Statement

   WebRTC [I-D.ietf-rtcweb-overview] based voice and video
   communications systems are becoming far more common inside
   enterprises, which often need voice and video media to traverse the
   enterprise firewall.  This can happen when a device inside the
   firewall such as a web browser or phone is exchanging media with a
   conference bridge or gateway outside the firewall, or it can happen
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