TLS Ticket Requests
draft-ietf-tls-ticketrequests-01
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
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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.
Pauly, et al. Expires December 8, 2019 [Page 1]
Internet-Draft TLS Ticket Requests June 2019
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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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