TLS Application-Layer Protocol Settings Extension
draft-vvv-tls-alps-01

Document Type Active Internet-Draft (individual)
Authors David Benjamin  , Victor Vasiliev 
Last updated 2020-09-21
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TLS Working Group                                            D. Benjamin
Internet-Draft                                               V. Vasiliev
Intended status: Standards Track                                  Google
Expires: 25 March 2021                                 21 September 2020

           TLS Application-Layer Protocol Settings Extension
                         draft-vvv-tls-alps-01

Abstract

   This document describes a Transport Layer Security (TLS) extension
   for negotiating application-layer protocol settings (ALPS) within the
   TLS handshake.  Any application-layer protocol operating over TLS can
   use this mechanism to indicate its settings to the peer in parallel
   with the TLS handshake completion.

Discussion Venues

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

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

   Source for this draft and an issue tracker can be found at
   https://github.com/vasilvv/tls-alps (https://github.com/vasilvv/tls-
   alps).

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
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 25 March 2021.

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Copyright Notice

   Copyright (c) 2020 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/
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   Please review these documents carefully, as they describe your rights
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   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions and Definitions . . . . . . . . . . . . . . . . .   3
   3.  Semantics . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Wire Protocol . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Client Encrypted Extensions . . . . . . . . . . . . . . .   6
     4.2.  0-RTT Handshakes  . . . . . . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   An application-layer protocol often starts with both parties
   negotiating parameters under which the protocol operates; for
   instance, HTTP/2 [RFC7540] uses a SETTINGS frame to exchange the list
   of protocol parameters supported by each endpoint.  This is usually
   achieved by waiting for TLS handshake [RFC8446] to complete and then
   performing the application-layer handshake within the application
   protocol itself.  This approach, despite its apparent simplicity at
   first, has multiple drawbacks:

   1.  While the server is technically capable of sending configuration
       to the peer as soon as it sends its Finished message, most TLS
       implementations do not allow any application data to be sent
       until the Finished message is received from the client.  This
       adds an extra round-trip to the time of when the server settings
       are available to the client.

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   2.  In QUIC, any settings delivered within the application layer can
       arrive after other application data; thus, the application has to
       operate under the assumption that peer's settings are not always
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