The Datagram Transport Layer Security (DTLS) Protocol Version 1.3
draft-ietf-tls-dtls13-30

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TLS                                                          E. Rescorla
Internet-Draft                                                RTFM, Inc.
Obsoletes: 6347 (if approved)                              H. Tschofenig
Intended status: Standards Track                             Arm Limited
Expires: May 9, 2019                                         N. Modadugu
                                                            Google, Inc.
                                                       November 05, 2018

   The Datagram Transport Layer Security (DTLS) Protocol Version 1.3
                        draft-ietf-tls-dtls13-30

Abstract

   This document specifies Version 1.3 of the Datagram Transport Layer
   Security (DTLS) protocol.  DTLS 1.3 allows client/server applications
   to communicate over the Internet in a way that is designed to prevent
   eavesdropping, tampering, and message forgery.

   The DTLS 1.3 protocol is intentionally based on the Transport Layer
   Security (TLS) 1.3 protocol and provides equivalent security
   guarantees.  Datagram semantics of the underlying transport are
   preserved by the DTLS protocol.

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
   working documents as Internet-Drafts.  The list of current Internet-
   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 May 9, 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

Rescorla, et al.           Expires May 9, 2019                  [Page 1]
Internet-Draft                  DTLS 1.3                   November 2018

   (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
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   include Simplified BSD License text as described in Section 4.e of
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   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   4
   3.  DTLS Design Rationale and Overview  . . . . . . . . . . . . .   5
     3.1.  Packet Loss . . . . . . . . . . . . . . . . . . . . . . .   6
       3.1.1.  Reordering  . . . . . . . . . . . . . . . . . . . . .   7
       3.1.2.  Message Size  . . . . . . . . . . . . . . . . . . . .   7
     3.2.  Replay Detection  . . . . . . . . . . . . . . . . . . . .   7
   4.  The DTLS Record Layer . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Determining the Header Format . . . . . . . . . . . . . .  11
     4.2.  Sequence Number and Epoch . . . . . . . . . . . . . . . .  11
       4.2.1.  Processing Guidelines . . . . . . . . . . . . . . . .  11
       4.2.2.  Reconstructing the Sequence Number and Epoch  . . . .  12
       4.2.3.  Sequence Number Encryption  . . . . . . . . . . . . .  12
     4.3.  Transport Layer Mapping . . . . . . . . . . . . . . . . .  13
     4.4.  PMTU Issues . . . . . . . . . . . . . . . . . . . . . . .  14
     4.5.  Record Payload Protection . . . . . . . . . . . . . . . .  16
       4.5.1.  Anti-Replay . . . . . . . . . . . . . . . . . . . . .  16
       4.5.2.  Handling Invalid Records  . . . . . . . . . . . . . .  16
   5.  The DTLS Handshake Protocol . . . . . . . . . . . . . . . . .  17
     5.1.  Denial-of-Service Countermeasures . . . . . . . . . . . .  18
     5.2.  DTLS Handshake Message Format . . . . . . . . . . . . . .  20
     5.3.  ClientHello Message . . . . . . . . . . . . . . . . . . .  22