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.

Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at http://datatracker.ietf.org/drafts/current/.

Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress."

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

Copyright Notice

Copyright (c) 2013 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 Provisions Relating to IETF Documents (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 to this document. Code Components extracted from this document must 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.

Table of Contents

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

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:

• OLD:
  • This extension MUST be present and MUST be marked critical. It MUST include exactly one policy, as specified in the RPKI 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 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 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

Authors' Addresses