Policy Qualifiers in Resource Public Key Infrastructure (RPKI) Certificates
RFC 7318

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Internet Engineering Task Force (IETF)                         A. Newton
Request for Comments: 7318                                          ARIN
Updates: 6487                                                  G. Huston
Category: Standards Track                                          APNIC
ISSN: 2070-1721                                                July 2014

     Policy Qualifiers in Resource Public Key Infrastructure (RPKI)
                              Certificates

Abstract

   This document updates RFC 6487 by clarifying the inclusion of policy
   qualifiers in the certificate policies extension of Resource Public
   Key Infrastructure (RPKI) resource certificates.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7318.

Copyright Notice

   Copyright (c) 2014 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Newton & Huston              Standards Track                    [Page 1]
RFC 7318                 RPKI Policy Qualifiers                July 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Update to RFC 6487  . . . . . . . . . . . . . . . . . . . . .   2
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   4.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Normative References  . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   This document introduces policy qualifiers in the certificate
   policies extension of the RPKI resource certificates.  This document
   updates [RFC6487].

   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 [RFC2119].

2.  Update to RFC 6487

   [RFC6487] profiles certificates, certificate revocation lists, and
   certificate signing requests specified in [RFC5280] for use in
   routing public key infrastructure.

   [RFC5280] defines an extension to certificates for the listing of
   policy information (see Section 4.2.1.4).  [RFC6487] states in
   Section 4.8.9: "This extension MUST be present and MUST be marked
   critical.  It MUST include exactly one policy, as specified in the
   RPKI CP [RFC6484]".  This references the CertPolicyId of the sequence
   allowed in PolicyInformation as defined by [RFC5280].

   [RFC5280] also specifies that PolicyInformation may optionally have a
   sequence of PolicyQualifierInfo objects.  [RFC6487] does not
   specifically allow or disallow these PolicyQualifierInfo objects,
   although Section 4 also states: "Unless specifically noted as being
   OPTIONAL, all the fields listed here MUST be present, and any other
   fields MUST NOT appear in a conforming resource certificate."

Newton & Huston              Standards Track                    [Page 2]
RFC 7318                 RPKI Policy Qualifiers                July 2014

   Because there is a need for some RPKI Certificate Authorities to
   include policy qualifiers in their certificates, this document
   updates Section 4.8.9 of [RFC6487] as follows:

      OLD:

         This extension MUST be present and MUST be marked critical.  It
         MUST include exactly one policy, as specified in the RPKI
         Certificate Policy (CP) [RFC6484].

      NEW:

         This extension MUST be present and MUST be marked critical.  It
         MUST include exactly one policy, as specified in the RPKI CP
         [RFC6484].  Exactly one policy qualifier MAY be included.  If a
         policy qualifier is included, the policyQualifierId MUST be the
         Certification Practice Statement (CPS) pointer qualifier type
         (id-qt-cps).

   As noted in [RFC5280], Section 4.2.1.4: "Optional qualifiers, which
   MAY be present, are not expected to change the definition of the
   policy."  In this case, any optional policy qualifier that MAY be