The TLS Multiple Certificate Status Request Extension
draft-ietf-tls-multiple-cert-status-extension-03

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Last updated 2013-01-09
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Network Working Group                                       Y. Pettersen
Internet-Draft                                           January 9, 2013
Intended status: Standards Track
Expires: July 13, 2013

         The TLS Multiple Certificate Status Request Extension
            draft-ietf-tls-multiple-cert-status-extension-03

Abstract

   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
   chain.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on July 13, 2013.

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Pettersen                 Expires July 13, 2013                 [Page 1]
Internet-Draft    Multiple Certificate Status Extension     January 2013

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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
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