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

Document Type Active Internet-Draft (tls WG)
Last updated 2019-06-06
Replaces draft-wood-tls-ticketrequests
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Network Working Group                                           T. Pauly
Internet-Draft                                                Apple Inc.
Intended status: Informational                               D. Schinazi
Expires: December 8, 2019                                     Google LLC
                                                                 C. Wood
                                                              Apple Inc.
                                                           June 06, 2019

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

Abstract

   TLS session tickets enable stateless connection resumption for
   clients without server-side, per-client state.  Servers vend an
   arbitrary number of session tickets to clients, at their discretion,
   upon connection establishment.  Clients store and use tickets when
   resuming future connections.  This document describes a mechanism by
   which clients may specify the desired number of tickets needed for
   future connections.  This extension aims to provide a means for
   servers to determine the number of tickets to generate in order to
   reduce ticket waste, while simultaneously priming clients for future
   connection attempts.

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 December 8, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (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 . . . . . . . . . . . . . . . . . .   3
   2.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Ticket Requests . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   5
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   As per [RFC5077], and as described in [RFC8446], TLS servers send
   clients an arbitrary number of session tickets at their own
   discretion in NewSessionTicket messages.  There are two limitations
   with this design.  First, servers choose some (often hard-coded)
   number of tickets vended per connection.  Second, clients do not have
   a way of expressing their desired number of tickets, which may impact
   future connection establishment.  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 clients control connection concurrency and
   resumption, a standard mechanism for requesting 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], DTLS 1.3 [I-D.ietf-tls-dtls13], and future
   versions thereof.

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1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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