Channel Bindings for TLS 1.3
draft-ietf-kitten-tls-channel-bindings-for-tls13-00

Document Type Active Internet-Draft (kitten WG)
Last updated 2020-06-11
Replaces draft-whited-tls-channel-bindings-for-tls13
Stream IETF
Intended RFC status (None)
Formats plain text html xml pdf htmlized (tools) htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state I-D Exists
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)
Transport Layer Security                                       S. Whited
Internet-Draft                                              11 June 2020
Updates: RFC5802, RFC8446 (if approved)                                 
Intended status: Standards Track                                        
Expires: 13 December 2020

                      Channel Bindings for TLS 1.3
          draft-ietf-kitten-tls-channel-bindings-for-tls13-00

Abstract

   This document defines a channel binding type, tls-exporter, that is
   compatible with TLS 1.3 [RFC8446] in accordance with On Channel
   Binding [RFC5056].

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 https://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 13 December 2020.

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/
   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.

Whited                  Expires 13 December 2020                [Page 1]
Internet-Draft        Channel Bindings for TLS 1.3             June 2020

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions and Terminology . . . . . . . . . . . . . . .   2
   2.  The 'tls-exporter' Channel Binding Type . . . . . . . . . . .   2
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
     4.1.  Registration of Channel Binding Type  . . . . . . . . . .   3
     4.2.  Registration of Channel Binding TLS Exporter Label  . . .   4
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     5.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   After problems were found with the channel binding types defined in
   [RFC5929] they were not defined for TLS 1.3 (see [RFC8446] section
   7.5).  To facilitate channel binding with TLS 1.3, a new channel
   binding type is needed.

1.1.  Conventions and Terminology

   Throughout this document the acronym "EKM" is used to refer to
   Exported Keying Material as defined in [RFC5705].

   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 BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

2.  The 'tls-exporter' Channel Binding Type

   IANA will register the 'tls-exporter' channel binding type to match
   the description below.

   Description: The EKM value obtained from the current TLS connection.

   The EKM is obtained using the keying material exporters for TLS as
   defined in [RFC5705] by supplying the following inputs:

   Label:  The ASCII string "EXPORTER-Channel-Binding" with no
      terminating NUL.

   Context value:  Empty context value.

   Length:  32 bytes.

Whited                  Expires 13 December 2020                [Page 2]
Internet-Draft        Channel Bindings for TLS 1.3             June 2020

   When TLS renegotiation is enabled channel binding using the "tls-
   exporter" type is not define and MUST NOT be supported.

3.  Security Considerations

   While it is possible to use this channel binding mechanism with TLS
   versions below 1.3, extra precaution must be taken to ensure that the
   chosen cipher suites always result in unique master secrets.  For
   more information see the Security Considerations section of
   [RFC5705].

   The Security Considerations sections of [RFC5056], [RFC5705], and
   [RFC8446] apply to this document.

4.  IANA Considerations

4.1.  Registration of Channel Binding Type

   This document adds the following registration in the "Channel-Binding
Show full document text