The TLS Multiple Certificate Status Request Extension

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Last updated 2012-07-08
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Network Working Group                                       Y. Pettersen
Internet-Draft                                        Opera Software ASA
Intended status: Standards Track                            July 8, 2012
Expires: January 9, 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
   that a server can use to provide status information (i.e., based on
   the Online Certificate Status Protocol and Server-Based Certificate
   Validation Protocol) not just about the server's own certificate, but
   also the status of intermediate certificates in the chain.

Status of this Memo

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   This Internet-Draft will expire on January 9, 2013.

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Pettersen                Expires January 9, 2013                [Page 1]
Internet-Draft    Multiple Certificate Status Extension        July 2012

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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; there are
   two methods available, the Online Certificate Status Protocol (OCSP)
   [RFC2560] and the Server-Based Certificate Validation Protocol (SCVP)

   Many CAs now issue intermediate CA certificates that not only specify
   the publication point for their CRLs in 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, or other protocols, to access up-to-date status information
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