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Internet Engineering Task Force (IETF)                        R. HousleyRequest for Comments: 5877                                Vigil SecurityCategory: Informational                                         May 2010ISSN: 2070-1721The application/pkix-attr-cert Media Type for Attribute CertificatesAbstract   This document specifies a MIME media type used to carry a single   attribute certificate as defined inRFC 5755.Status of This Memo   This document is not an Internet Standards Track specification; it is   published for informational purposes.   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).  Not all documents   approved by the IESG are a candidate for any level of Internet   Standard; seeSection 2 of RFC 5741.   Information about the current status of this document, any errata,   and how to provide feedback on it may be obtained athttp://www.rfc-editor.org/info/rfc5877.Copyright Notice   Copyright (c) 2010 IETF Trust and the persons identified as the   document authors.  All rights reserved.   This document is subject toBCP 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.Housley                       Informational                     [Page 1]

RFC 5877          application/pkix-attr-cert Media Type         May 20101.  IntroductionRFC 2585 [RFC2585] defines the MIME media types for public key   certificates and certificate revocation lists (CRLs).  This document   specifies a MIME media type for use with attribute certificates as   defined inRFC 5755 [RFC5755].   Attribute certificates are ASN.1 encoded [X.680].RFC 5755 [RFC5755]   tells which portions of the attribute certificate must use the   distinguished encoding rules (DER) [X.690] and which portions are   permitted to use the basic encoding rules (BER) [X.690].  Since DER   is a proper subset of BER, BER decoding all parts of a properly   constructed attribute certificate will be successful.2.  IANA Considerations   This document registers with IANA the "application/pkix-attr-cert"   Internet Media Type for use with an attribute certificate as defined   in [RFC5755].  This registration follows the procedures defined inBCP 13 [RFC4288].      Type name: application      Subtype name: pkix-attr-cert      Required parameters: None      Optional parameters: None      Encoding considerations: binary      Security considerations:        An attribute certificate provides authorization information.  An        attribute certificate is most often used in conjunction with a        public key certificate [RFC5280], and the two certificates        should use the same encoding of the distinguished name as        described in the Security Considerations of this document.      Interoperability considerations:        The media type will be used with HTTP to fetch attribute        certificates.  Other uses may emerge in the future.      Published specification:RFC 5755Housley                       Informational                     [Page 2]

RFC 5877          application/pkix-attr-cert Media Type         May 2010      Applications that use this media type:        The media type is used with a MIME-compliant transport to        transfer an attribute certificate.  Attribute certificates        convey authorization information, and they are most often used        in conjunction with public key certificates as defined in        [RFC5280].      Additional information:        Magic number(s): None        File extension(s): .ac        Macintosh File Type Code(s): none      Person & email address to contact for further information:        Russ Housley        housley@vigilsec.com      Intended usage: COMMON      Restrictions on usage: none      Author:        Russ Housley <housley@vigilsec.com>      Intended usage: COMMON      Change controller:        The IESG <iesg@ietf.org>3.  Security Considerations   Attribute certificate issuers must encode the holder entity name in   exactly the same way as the public key certificate distinguished   name.  If they are encoded differently, implementations may fail to   recognize that the attribute certificate and public key certificate   belong to the same entity.4.  References4.1.  Normative References   [RFC5755]   Farrell, S., Housley, R., and S. Turner, "An Internet               Attribute Certificate Profile for Authorization",RFC 5755, January 2010.Housley                       Informational                     [Page 3]

RFC 5877          application/pkix-attr-cert Media Type         May 20104.2.  Informative References   [RFC2585]   Housley, R. and P. Hoffman, "Internet X.509 Public Key               Infrastructure Operational Protocols: FTP and HTTP",RFC 2585, May 1999.   [RFC4288]   Freed, N. and J. Klensin, "Media Type Specifications and               Registration Procedures",BCP 13,RFC 4288,               December 2005.   [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.   [X.680]     ITU-T Recommendation X.680 (2002) | ISO/IEC 8824-1:2002,               Information technology - Abstract Syntax Notation One               (ASN.1):  Specification of basic notation.   [X.690]     ITU-T Recommendation X.690 (2002) | ISO/IEC 8825-1:2002,               Information technology - ASN.1 encoding rules:               Specification of Basic Encoding Rules (BER), Canonical               Encoding Rules (CER) and Distinguished Encoding               Rules (DER).Author's Address   Russell Housley   Vigil Security, LLC   918 Spring Knoll Drive   Herndon, VA 20170   USA   EMail: housley@vigilsec.comHousley                       Informational                     [Page 4]