The TLS Multiple Certificate Status Request Extension

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Last updated 2013-04-11
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Network Working Group                                       Y. Pettersen
Internet-Draft                                            April 11, 2013
Intended status: Standards Track
Expires: October 13, 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
   several certificate status methods.  (The use of the Certificate
   Status extension is commonly referred to as "OCSP stapling".)  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

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

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

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1.  Introduction

   The Transport Layer Security (TLS) Extension [RFC6066] framework
   defines, among other extensions, the Certificate Status Extension
   (also referred to as "OCSP stapling") 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

   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), introducing further delays.  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,
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