X.509v3 TLS Feature Extension
draft-hallambaker-tlsfeature-04

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Last updated 2014-06-11
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Internet Engineering Task Force                          P. Hallam-Baker
Internet-Draft                                         Comodo Group Inc.
Intended status: Standards Track                           June 11, 2014
Expires: December 13, 2014

                     X.509v3 TLS Feature Extension
                    draft-hallambaker-tlsfeature-04

Abstract

   The purpose of the TLS Feature extension is to prevent downgrade
   attacks that are not otherwise prevented by the TLS protocol.  In
   particular, the TLS Feature extension may be used to mandate support
   for revocation checking features in the TLS protocol such as OCSP
   stapling.  Informing clients that an OCSP status response will always
   be stapled permits an immediate failure in the case that the response
   is not stapled.  This in turn prevents a denial of service attack
   that might otherwise be possible.

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 13, 2014.

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
   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

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   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.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
     1.2.  TLS Feature . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Syntax  . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  TLS Feature . . . . . . . . . . . . . . . . . . . . . . .   5
       3.1.1.  status_request  . . . . . . . . . . . . . . . . . . .   5
     3.2.  Use . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
       3.2.1.  Certificate Signing Request . . . . . . . . . . . . .   5
       3.2.2.  Certificate Signing Certificate . . . . . . . . . . .   5
       3.2.3.  End Entity Certificate  . . . . . . . . . . . . . . .   6
     3.3.  Processing  . . . . . . . . . . . . . . . . . . . . . . .   6
       3.3.1.  Certification Authority . . . . . . . . . . . . . . .   6
       3.3.2.  Server  . . . . . . . . . . . . . . . . . . . . . . .   6
       3.3.3.  Client  . . . . . . . . . . . . . . . . . . . . . . .   7
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
     5.1.  Alternative Certificates and Certificate Issuers  . . . .   7
     5.2.  Denial of Service . . . . . . . . . . . . . . . . . . . .   7
     5.3.  Cipher Suite Downgrade Attack . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Definitions

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

1.2.  TLS Feature

   In order to avoid the confusion that would occur in attempting to
   describe an X.509 extension describing the use of TLS extensions, in
   this document the term 'extension' is reserved to refer to X.509v3
   extensions and the term 'feature' is used to refer to a TLS
   extension.

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2.  Purpose

   The purpose of the TLS Feature extension is to prevent downgrade
   attacks that are not otherwise prevented by the TLS protocol.
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