X.509v3 TLS Feature Extension
draft-hallambaker-tlsfeature-08

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Document Type Active Internet-Draft (individual in sec area)
Last updated 2015-03-31 (latest revision 2015-03-23)
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Internet Engineering Task Force (IETF)              Phillip Hallam-Baker
INTERNET-DRAFT                                         Comodo Group Inc.
Intended Status: Standards Track                          March 23, 2015
Expires: September 24, 2015

                     X.509v3 TLS Feature Extension
                    draft-hallambaker-tlsfeature-08

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

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   Copyright (c) 2015 IETF Trust and the persons identified as the 
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Hallam-Baker               September 24, 2015                   [Page 1]


Internet-Draft           TLS Feature Extension                March 2015

Table of Contents

   1.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
      1.1.  Requirements Language . . . . . . . . . . . . . . . . . .  3
      1.2.  TLS Feature, X.509 Extension  . . . . . . . . . . . . . .  3
   2.  Purpose  . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
      3.1.  TLS Feature . . . . . . . . . . . . . . . . . . . . . . .  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 . . . . . . . . . . . . . . .  5
      3.3.  Processing  . . . . . . . . . . . . . . . . . . . . . . .  6
         3.3.1.  Certification Authority  . . . . . . . . . . . . . .  6
         3.3.2.  Server . . . . . . . . . . . . . . . . . . . . . . .  6
         3.3.3.  Client . . . . . . . . . . . . . . . . . . . . . . .  6
   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  . . . . . . . . . . . . . . . . . . . . .  8
   7.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  8
      7.1.  Normative References  . . . . . . . . . . . . . . . . . .  8
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . .  8

Hallam-Baker               September 24, 2015                   [Page 2]


Internet-Draft           TLS Feature Extension                March 2015

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, X.509 Extension

   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 
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