The TLS Multiple Certificate Status Request Extension

The information below is for an old version of the document
Document Type Active Internet-Draft (tls WG)
Last updated 2012-10-19
Stream IETF
Intended RFC status (None)
Formats plain text pdf html bibtex
Stream WG state WG Document
Document shepherd None
IESG IESG state I-D Exists
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)
Network Working Group                                       Y. Pettersen
Internet-Draft                                        Opera Software ASA
Intended status: Standards Track                        October 19, 2012
Expires: April 22, 2013

         The TLS Multiple Certificate Status Request Extension


   This document defines the Transport Layer Security (TLS) Certificate
   Status Version 2 Extension to allow clients to specify and support
   multiple certificate status methods.  Also defined is a new method
   based on the Online Certificate Status Protocol (OCSP) that servers
   can use to provide status information not just about the server's own
   certificate, but also the status of intermediate certificates in the

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

   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 April 22, 2013.

Copyright Notice

   Copyright (c) 2012 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
   ( 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

Pettersen                Expires April 22, 2013                 [Page 1]
Internet-Draft    Multiple Certificate Status Extension     October 2012

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

1.  Introduction

   The Transport Layer Security (TLS) Extension [RFC6066] framework
   defines, among other extensions, the Certificate Status Extension
   that clients can use to request the server's copy of the current
   status of its certificate.  The benefits of this extension include a
   reduced number of roundtrips and network delays for the client to
   verify the status of the server's certificate and a reduced load on
   the certificate issuer's status response servers, thus solving a
   problem that can become significant when the issued certificate is
   presented by a frequently visited server.

   There are two problems with the existing Certificate Status
   extension.  First, it does not provide functionality to request the
   status information about intermediate Certification Authority (CA)
   certificates, which means the client has to request status
   information through other methods, such as Certificate Revocation
   Lists (CRLs), thus adding additional delay.  Second, the current
   format of the extension and requirements in the TLS protocol prevents
   a client from offering the server multiple status methods.

   Many CAs are now issuing intermediate CA certificates that not only
   specify the publication point for their CRLs in a CRL Distribution
   Point [RFC5280], but also specify a URL for their OCSP [RFC2560]
   server in Authority Information Access [RFC5280].  Given that client-
   cached CRLs are frequently out of date, clients would benefit from
   using OCSP to access up-to-date status information about intermediate
   CA certificates.  The benefit to the issuing CA is less clear, as
   providing the bandwidth for the OCSP responder can be costly,
   especially for CAs with many high-traffic subscriber sites, and this
   cost is a concern for many CAs.  There are cases where OCSP requests
Show full document text