QUIC over DTLS
draft-rescorla-quic-over-dtls-00

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QUIC Working Group                                           E. Rescorla
Internet-Draft                                                RTFM, Inc.
Intended status: Informational                            March 05, 2018
Expires: September 6, 2018

                             QUIC over DTLS
                    draft-rescorla-quic-over-dtls-00

Abstract

   QUIC in-band cryptographic negotiation on stream 0 creates a number
   of odd edge cases.  This document considers an alternative design in
   which QUIC transport is run directly over DTLS, thus separating the
   cryptographic negotiation from the transport piece.

Status of This Memo

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   This Internet-Draft will expire on September 6, 2018.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Rescorla                Expires September 6, 2018               [Page 1]
Internet-Draft                  QUIC/DTLS                     March 2018

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Design Overview . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Reliability . . . . . . . . . . . . . . . . . . . . . . .   6
       2.1.1.  DTLS Reliability and ACKs . . . . . . . . . . . . . .   6
       2.1.2.  RTT Estimation  . . . . . . . . . . . . . . . . . . .   6
       2.1.3.  QUIC Reliability and ACKs . . . . . . . . . . . . . .   6
     2.2.  Version Negotiation . . . . . . . . . . . . . . . . . . .   7
     2.3.  Transport Parameters  . . . . . . . . . . . . . . . . . .   8
     2.4.  Key Changes and New Session Ticket  . . . . . . . . . . .   8
     2.5.  Connection IDs  . . . . . . . . . . . . . . . . . . . . .   9
   3.  Required Changes to DTLS  . . . . . . . . . . . . . . . . . .   9
     3.1.  Handshake Obfuscation . . . . . . . . . . . . . . . . . .   9
     3.2.  Obfuscation Negotiation Packet  . . . . . . . . . . . . .  11
     3.3.  Packet Header Encryption  . . . . . . . . . . . . . . . .  11
     3.4.  Stateless Reset . . . . . . . . . . . . . . . . . . . . .  11
   4.  Required Changes to QUIC Documents  . . . . . . . . . . . . .  12
     4.1.  TLS Document  . . . . . . . . . . . . . . . . . . . . . .  12
     4.2.  Transport Document  . . . . . . . . . . . . . . . . . . .  12
     4.3.  Recovery Document . . . . . . . . . . . . . . . . . . . .  13
     4.4.  Invariants Document . . . . . . . . . . . . . . . . . . .  13
   5.  Potential Additional Benefits . . . . . . . . . . . . . . . .  13
     5.1.  Record Coalescence  . . . . . . . . . . . . . . . . . . .  13
     5.2.  More Straightforward Demuxing . . . . . . . . . . . . . .  13
   6.  Potential Points of Concern . . . . . . . . . . . . . . . . .  13
     6.1.  Record Size/Overhead  . . . . . . . . . . . . . . . . . .  14
     6.2.  Status of DTLS 1.3 Maturity . . . . . . . . . . . . . . .  14
     6.3.  Epoch and ACKs  . . . . . . . . . . . . . . . . . . . . .  15
     6.4.  Crypto Layer Agility  . . . . . . . . . . . . . . . . . .  15
   7.  WebRTC Binding  . . . . . . . . . . . . . . . . . . . . . . .  15
   8.  Implementation Status . . . . . . . . . . . . . . . . . . . .  16
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  16
     10.2.  Informative References . . . . . . . . . . . . . . . . .  17
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   QUIC [I-D.ietf-quic-transport] [I-D.ietf-quic-tls] as currently
   designed performs cryptographic negotiation by sending TLS 1.3
   [I-D.ietf-tls-tls13] traffic directly in stream 0.  This design was
   the result of desiring to have tight coupling between the
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