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Transport Layer Security (TLS) Cached Information Extension
draft-ietf-tls-cached-info-17

Document type: Active Internet-Draft (tls WG)
Document stream: IETF
Last updated: 2014-11-13
Intended RFC status: Proposed Standard
Other versions: plain text, xml, pdf, html

IETF State: WG Document
Revised I-D Needed - Issue raised by WGLC
Document shepherd: Joseph Salowey

IESG State: I-D Exists
Responsible AD: (None)
Send notices to: No addresses provided

TLS                                                         S. Santesson
Internet-Draft                                           3xA Security AB
Intended status: Standards Track                           H. Tschofenig
Expires: May 17, 2015                                           ARM Ltd.
                                                       November 13, 2014

      Transport Layer Security (TLS) Cached Information Extension
                   draft-ietf-tls-cached-info-17.txt

Abstract

   Transport Layer Security (TLS) handshakes often include fairly static
   information, such as the server certificate and a list of trusted
   Certification Authorities (CAs).  This information can be of
   considerable size, particularly if the server certificate is bundled
   with a complete certificate chain (i.e., the certificates of
   intermediate CAs up to the root CA).

   This document defines an extension that allows a TLS client to inform
   a server of cached information, allowing the server to omit already
   available information.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 17, 2015.

Copyright Notice

   Copyright (c) 2014 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
   (http://trustee.ietf.org/license-info) in effect on the date of

Santesson & Tschofenig    Expires May 17, 2015                  [Page 1]
Internet-Draft      TLS Cached Information Extension       November 2014

   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
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Cached Information Extension  . . . . . . . . . . . . . . . .   3
     3.1.  Certificate_list Fingerprint  . . . . . . . . . . . . . .   4
     3.2.  Certificate_authorities Fingerprint . . . . . . . . . . .   4
     3.3.  Fingerprint Hash Algorithm  . . . . . . . . . . . . . . .   4
   4.  Exchange Specification  . . . . . . . . . . . . . . . . . . .   5
     4.1.  Omitting the Certificate List . . . . . . . . . . . . . .   5
     4.2.  Omitting the Trusted Certificate Authorities  . . . . . .   6
   5.  Example . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     7.1.  New Entry to the TLS ExtensionType Registry . . . . . . .   9
     7.2.  New Registry for CachedInformationType  . . . . . . . . .   9
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Reducing the amount of information exchanged during a Transport Layer
   Security handshake to a minimum helps to improve performance in
   environments where devices are connected to a network with a low
   bandwidth, and lossy radio technology.  With Internet of Things such
   environments exist, for example, when smart objects are connected
   using a low power IEEE 802.15.4 radio or via Bluetooth Smart.  For
   more information about the challenges with smart object deployments
   please see [RFC6574].

   This specification defines a TLS extension that allows a client and a
   server to exclude transmission information cached in an earlier TLS
   handshake.

   A typical example exchange may therefore look as follows.  First, the
   client and the server executes the usual TLS handshake.  The client

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