Datagram Transport Layer Security (DTLS) over Stream Control Transmission Protocol (SCTP)
draft-westerlund-tsvwg-dtls-over-sctp-bis-01

Document Type Active Internet-Draft (individual)
Authors Magnus Westerlund  , John Preuß Mattsson  , Claudio Porfiri  , Michael Tüxen 
Last updated 2021-02-22
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TSVWG                                                      M. Westerlund
Internet-Draft                                         J. Preuß Mattsson
Obsoletes: 6083 (if approved)                                 C. Porfiri
Intended status: Standards Track                                Ericsson
Expires: 26 August 2021                                         M. Tüxen
                                         Münster Univ. of Appl. Sciences
                                                        22 February 2021

      Datagram Transport Layer Security (DTLS) over Stream Control
                      Transmission Protocol (SCTP)
              draft-westerlund-tsvwg-dtls-over-sctp-bis-01

Abstract

   This document describes a proposed update for the usage of the
   Datagram Transport Layer Security (DTLS) protocol to protect user
   messages sent over the Stream Control Transmission Protocol (SCTP).

   DTLS over SCTP provides mutual authentication, confidentiality,
   integrity protection, and replay protection for applications that use
   SCTP as their transport protocol and allows client/server
   applications to communicate in a way that is designed to give
   communications privacy and to prevent eavesdropping and detect
   tampering or message forgery.

   Applications using DTLS over SCTP can use almost all transport
   features provided by SCTP and its extensions.  This document intends
   to obsolete RFC 6083 and removes the 16 kB limitation on user message
   size by defining a secure user message fragmentation so that multiple
   DTLS records can be used to protect a single user message.  It
   further updates the DTLS versions to use, as well as the HMAC
   algorithms for SCTP-AUTH, and simplifies the implementation by some
   stricter requirements on the establishment procedures.

Discussion Venues

   This note is to be removed before publishing as an RFC.

   Discussion of this document takes place on the TSVWG Working Group
   mailing list (tsvwg@ietf.org), which is archived at
   https://mailarchive.ietf.org/arch/browse/tsvwg/.

   Source for this draft and an issue tracker can be found at
   https://github.com/gloinul/draft-westerlund-tsvwg-dtls-over-sctp-bis.

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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 26 August 2021.

Copyright Notice

   Copyright (c) 2021 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 (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 to this document.  Code Components
   extracted from this document must include Simplified BSD License text
   as described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   3
       1.1.1.  Comparison with TLS for SCTP  . . . . . . . . . . . .   4
       1.1.2.  Changes from RFC 6083 . . . . . . . . . . . . . . . .   5
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   5
     1.3.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   5
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  DTLS Considerations . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Version of DTLS . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Cipher Suites . . . . . . . . . . . . . . . . . . . . . .   6
     3.3.  Message Sizes . . . . . . . . . . . . . . . . . . . . . .   6
     3.4.  Replay Protection . . . . . . . . . . . . . . . . . . . .   8
     3.5.  Path MTU Discovery  . . . . . . . . . . . . . . . . . . .   8
     3.6.  Retransmission of Messages  . . . . . . . . . . . . . . .   8
   4.  SCTP Considerations . . . . . . . . . . . . . . . . . . . . .   8

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