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Versions: (draft-newton-sidr-policy-qualifiers) 00 01 02 RFC 7318

Network Working Group                                          A. Newton
Internet-Draft                                                      ARIN
Updates: 6487 (if approved)                                    G. Huston
Intended status: Standards Track                                   APNIC
Expires: January 4, 2015                                    July 3, 2014


                 Policy Qualifiers in RPKI Certificates
                  draft-ietf-sidr-policy-qualifiers-02

Abstract

   This document updates RFC 6487 by clarifying the inclusion of policy
   qualifiers in the certificate policies extension of RPKI resource
   certificates.

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
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   This Internet-Draft will expire on January 4, 2015.

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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   described in the Simplified BSD License.




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Table of Contents

   1.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Update to RFC 6487  . . . . . . . . . . . . . . . . . . . . .   2
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   3
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Terminology

   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 it also states in section 4: "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."

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




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         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
   present in a resource certificate MUST NOT change the definition of
   the RPKI CP [RFC6484].

3.  IANA Considerations

   None.

4.  Security Considerations

   The Security Considerations of [RFC6487] apply to this document.

   This document updates the RPKI certificate profile to specify that
   the certificate policies extension can include a policy qualifier,
   which is a URI.  While de-referencing the URI is not required for
   certificate validation, doing so could provide a denial-of-service
   (DoS) vector, where the target host may be subjected to bogus work
   de-referencing the URI.  However, this specification, like [RFC5280],
   places no processing requirements on the URI included in the
   qualifier.

   As an update to [RFC6487], this document broadens the class of
   certificates that conform to the RPKI profile by explicitly including
   within the profile those certificates that contain a policy qualifier
   as described here.  A relying party that performs a strict validation
   based on [RFC6487] and fails to support the updates described in this
   document, would incorrectly invalidate RPKI objects that include the
   changes in Section 2.

5.  Acknowledgments

   Frank Hill and Adam Guyot helped define the scope of this issue and
   identified and worked with RPKI validator implementers to clarify the
   use of policy qualifiers in resource certificates.

   Sean Turner provided significant text to this document regarding the
   processing of the CPS URI and limiting the scope of the allowable
   content of the policy qualifier.




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6.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC5280]  Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
              Housley, R., and W. Polk, "Internet X.509 Public Key
              Infrastructure Certificate and Certificate Revocation List
              (CRL) Profile", RFC 5280, May 2008.

   [RFC6484]  Kent, S., Kong, D., Seo, K., and R. Watro, "Certificate
              Policy (CP) for the Resource Public Key Infrastructure
              (RPKI)", BCP 173, RFC 6484, February 2012.

   [RFC6487]  Huston, G., Michaelson, G., and R. Loomans, "A Profile for
              X.509 PKIX Resource Certificates", RFC 6487, February
              2012.

Authors' Addresses

   Andrew Lee Newton
   American Registry for Internet Numbers
   3635 Concorde Parkway
   Chantilly, VA  20151
   USA

   Email: andy@arin.net
   URI:   http://www.arin.net


   Geoff Huston
   Asia Pacific Network Information Center
   6 Cordelia Street
   South Brisbane  QLD 4101
   Australia

   Email: gih@apnic.net
   URI:   http://www.apnic.net













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