Network Working Group A.L. Newton
Internet-Draft ARIN
Updates: 6487 (if approved) G.I.H. Huston
Intended status: Standards Track APNIC
Expires: November 10, 2013 May 09, 2013

Policy Qualifiers in RPKI Certificates
draft-ietf-sidr-policy-qualifiers-00

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.

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This Internet-Draft will expire on November 10, 2013.

Copyright Notice

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Table of Contents

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."

This document updates [RFC6487], Section 4.8.9, as follows:

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 qualifiers 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. Checking of the URI might allow denial-of-service (DoS) attacks, where the target host may be subjected to bogus work resolving the URI. However, this specification, like [RFC5280], places no processing requirements on the URI included in the qualifier.

5. Acknowledgements

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.

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 US 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