TLS Ticket Requests
draft-wood-tls-ticketrequests-01

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Last updated 2018-11-06 (latest revision 2018-10-13)
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Network Working Group                                           T. Pauly
Internet-Draft                                               D. Schinazi
Intended status: Informational                                   C. Wood
Expires: April 16, 2019                                       Apple Inc.
                                                        October 13, 2018

                          TLS Ticket Requests
                    draft-wood-tls-ticketrequests-01

Abstract

   TLS session tickets enable stateless connection resumption for
   clients without server-side per-client state.  Servers vend session
   tickets to clients, at their discretion, upon connection
   establishment.  Clients store and use tickets when resuming future
   connections.  Moreover, clients should use tickets at most once for
   session resumption, especially if such keying material protects early
   application data.  Single-use tickets bound the number of parallel
   connections a client may initiate by the number of tickets received
   from a given server.  To address this limitation, this document
   describes a mechanism by which clients may specify the desired number
   of tickets needed for future connections.

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 April 16, 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

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   (http://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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Ticket Requests . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   4
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   As per [RFC5077], and as described in [RFC8446], TLS servers send
   clients session tickets at their own discretion in NewSessionTicket
   messages.  Clients are in complete control of how many tickets they
   may use when establishing future and subsequent connections.  For
   example, clients may open multiple TLS connections to the same server
   for HTTP, or may race TLS connections across different network
   interfaces.  The latter is especially useful in transport systems
   that implement Happy Eyeballs [RFC8305].  Since connection
   concurrency and resumption is controlled by clients, a standard
   mechanism to request more than one ticket is desirable.

   This document specifies a new TLS extension - ticket_request - that
   may be used by clients to express their desired number of session
   tickets.  Servers may use this extension as a hint of the number of
   NewSessionTicket messages to vend.  This extension is only applicable
   to TLS 1.3 [RFC8446] and future versions of TLS.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   [RFC2119] [RFC8174] when, and only when, they appear in all capitals,
   as shown here.

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2.  Use Cases

   The ability to request one or more tickets is useful for a variety of
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