rfc4523.txt

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RFC 4523                   LDAP X.509 Schema                   June 2006


4.6.  deltaRevocationList

   The deltaRevocationList attribute holds certificate lists, as
   discussed in 11.2.6 of [X.509].

      ( 2.5.4.53 NAME 'deltaRevocationList'
           DESC 'X.509 delta revocation list'
           EQUALITY certificateListExactMatch
           SYNTAX 1.3.6.1.4.1.1466.115.121.1.9 )

   As required by this attribute type's syntax, values of this attribute
   MUST be requested and transferred using the attribute description
   "deltaRevocationList;binary".

4.7.  supportedAlgorithms

   The supportedAlgorithms attribute holds supported algorithms, as
   discussed in 11.2.7 of [X.509].

      ( 2.5.4.52 NAME 'supportedAlgorithms'
           DESC 'X.509 supported algorithms'
           EQUALITY algorithmIdentifierMatch
           SYNTAX 1.3.6.1.4.1.1466.115.121.1.49 )

   As required by this attribute type's syntax, values of this attribute
   MUST be requested and transferred using the attribute description
   "supportedAlgorithms;binary".

5.  Object Classes

   This section details a set of certificate-related object classes for
   use in LDAP.

5.1.  pkiUser

   This object class is used in augment entries for objects that may be
   subject to certificates, as defined in clause 11.1.1 of [X.509].

      ( 2.5.6.21 NAME 'pkiUser'
           DESC 'X.509 PKI User'
           SUP top AUXILIARY
           MAY userCertificate )









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5.2.  pkiCA

   This object class is used to augment entries for objects that act as
   certificate authorities, as defined in clause 11.1.2 of [X.509]

      ( 2.5.6.22 NAME 'pkiCA'
           DESC 'X.509 PKI Certificate Authority'
           SUP top AUXILIARY
           MAY ( cACertificate $ certificateRevocationList $
                authorityRevocationList $ crossCertificatePair ) )

5.3.  cRLDistributionPoint

   This class is used to represent objects that act as CRL distribution
   points, as discussed in clause 11.1.3 of [X.509].

      ( 2.5.6.19 NAME 'cRLDistributionPoint'
           DESC 'X.509 CRL distribution point'
           SUP top STRUCTURAL
           MUST cn
           MAY ( certificateRevocationList $
                authorityRevocationList $ deltaRevocationList ) )

5.4.  deltaCRL

   The deltaCRL object class is used to augment entries to hold delta
   revocation lists, as discussed in clause 11.1.4 of [X.509].

      ( 2.5.6.23 NAME 'deltaCRL'
           DESC 'X.509 delta CRL'
           SUP top AUXILIARY
           MAY deltaRevocationList )

5.5.  strongAuthenticationUser

   This object class is used to augment entries for objects
   participating in certificate-based authentication, as defined in
   clause 6.15 of [X.521].  This object class is deprecated in favor of
   pkiUser.

      ( 2.5.6.15 NAME 'strongAuthenticationUser'
           DESC 'X.521 strong authentication user'
           SUP top AUXILIARY
           MUST userCertificate )







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5.6.  userSecurityInformation

   This object class is used to augment entries with needed additional
   associated security information, as defined in clause 6.16 of
   [X.521].

      ( 2.5.6.18 NAME 'userSecurityInformation'
           DESC 'X.521 user security information'
           SUP top AUXILIARY
           MAY ( supportedAlgorithms ) )

5.7.  certificationAuthority

   This object class is used to augment entries for objects that act as
   certificate authorities, as defined in clause 6.17 of [X.521].  This
   object class is deprecated in favor of pkiCA.

      ( 2.5.6.16 NAME 'certificationAuthority'
           DESC 'X.509 certificate authority'
           SUP top AUXILIARY
           MUST ( authorityRevocationList $
                certificateRevocationList $ cACertificate )
           MAY crossCertificatePair )

5.8.  certificationAuthority-V2

   This object class is used to augment entries for objects that act as
   certificate authorities, as defined in clause 6.18 of [X.521].  This
   object class is deprecated in favor of pkiCA.

      ( 2.5.6.16.2 NAME 'certificationAuthority-V2'
           DESC 'X.509 certificate authority, version 2'
           SUP certificationAuthority AUXILIARY
           MAY deltaRevocationList )

6.  Security Considerations

   General certificate considerations [RFC3280] apply to LDAP-aware
   certificate applications.  General LDAP security considerations
   [RFC4510] apply as well.

   While elements of certificate information are commonly signed, these
   signatures only protect the integrity of the signed information.  In
   the absence of data integrity protections in LDAP (or lower layer,
   e.g., IPsec), a server is not assured that client certificate request
   (or other request) was unaltered in transit.  Likewise, a client
   cannot be assured that the results of the query were unaltered in




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RFC 4523                   LDAP X.509 Schema                   June 2006


   transit.  Hence, it is generally recommended that implementations
   make use of authentication and data integrity services in LDAP
   [RFC4513][RFC4511].

7.  IANA Considerations

7.1.  Object Identifier Registration

   The IANA has registered an LDAP Object Identifier [RFC4520] for use
   in this technical specification.

      Subject: Request for LDAP OID Registration
      Person & email address to contact for further information:
          Kurt Zeilenga <[e-mail]>
      Specification: RFC 4523
      Author/Change Controller: IESG
      Comments:
          Identifies the LDAP X.509 Certificate schema elements
           introduced in this document.

7.2.  Descriptor Registration

   The IANA has updated the LDAP
   Descriptor registry [RFC44520] as indicated below.

      Subject: Request for LDAP Descriptor Registration
      Descriptor (short name): see table
      Object Identifier: see table
      Person & email address to contact for further information:
          Kurt Zeilenga <[e-mail]>
      Usage: see table
      Specification: RFC 4523
      Author/Change Controller: IESG

      algorithmIdentifierMatch     M 2.5.13.40
      authorityRevocationList      A 2.5.4.38 *
      cACertificate                A 2.5.4.37 *
      cRLDistributionPoint         O 2.5.6.19 *
      certificateExactMatch        M 2.5.13.34
      certificateListExactMatch    M 2.5.13.38
      certificateListMatch         M 2.5.13.39
      certificateMatch             M 2.5.13.35
      certificatePairExactMatch    M 2.5.13.36
      certificatePairMatch         M 2.5.13.37
      certificateRevocationList    A 2.5.4.39 *
      certificationAuthority       O 2.5.6.16 *
      certificationAuthority-V2    O 2.5.6.16.2 *
      crossCertificatePair         A 2.5.4.40 *



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      deltaCRL                     O 2.5.6.23 *
      deltaRevocationList          A 2.5.4.53 *
      pkiCA                        O 2.5.6.22 *
      pkiUser                      O 2.5.6.21 *
      strongAuthenticationUser     O 2.5.6.15 *
      supportedAlgorithms          A 2.5.4.52 *
      userCertificate              A 2.5.4.36 *
      userSecurityInformation      O 2.5.6.18 *

      * Updates previous registration

8.  Acknowledgements

   This document is based on X.509, a product of the ITU-T.  A number of
   LDAP schema definitions were based on those found in RFCs 2252 and
   2256, both products of the IETF ASID WG.  The ABNF productions in
   Appendix A were provided by Steven Legg.  Additional material was
   borrowed from prior works by David Chadwick and Steven Legg to refine
   the LDAP X.509 schema.

9.  References

9.1.  Normative References

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

   [RFC3641]  Legg, S., "Generic String Encoding Rules (GSER) for ASN.1
              Types", RFC 3641, October 2003.

   [RFC4510]  Zeilenga, K., Ed., "Lightweight Directory Access Protocol
              (LDAP): Technical Specification Road Map", RFC 4510, June
              2006.

   [RFC4512]  Zeilenga, K., "Lightweight Directory Access Protocol
              (LDAP): Directory Information Models", RFC 4512, June
              2006.

   [RFC4522]  Legg, S., "Lightweight Directory Access Protocol (LDAP):
              The Binary Encoding Option", RFC 4522, June 2006.

   [X.509]    International Telecommunication Union - Telecommunication
              Standardization Sector, "The Directory: Authentication
              Framework", X.509(2000).







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   [X.521]    International Telecommunication Union - Telecommunication
              Standardization Sector, "The Directory: Selected Object
              Classes", X.521(2000).

   [X.690]    International Telecommunication Union - Telecommunication
              Standardization Sector, "Specification of ASN.1 encoding
              rules: Basic Encoding Rules (BER), Canonical Encoding
              Rules (CER), and Distinguished Encoding Rules (DER)",
              X.690(2002) (also ISO/IEC 8825-1:2002).

9.2.  Informative References

   [RFC1777]  Yeong, W., Howes, T., and S. Kille, "Lightweight Directory
              Access Protocol", RFC 1777, March 1995.

   [RFC2156]  Kille, S., "MIXER (Mime Internet X.400 Enhanced Relay):
              Mapping between X.400 and RFC 822/MIME", RFC 2156, January
              1998.

   [RFC3280]  Housley, R., Polk, W., Ford, W., and D. Solo, "Internet
              X.509 Public Key Infrastructure Certificate and
              Certificate Revocation List (CRL) Profile", RFC 3280,
              April 2002.

   [RFC3494]  Zeilenga, K., "Lightweight Directory Access Protocol
              version 2 (LDAPv2) to Historic Status", RFC 3494, March
              2003.

   [RFC3642]  Legg, S., "Common Elements of Generic String Encoding
              Rules (GSER) Encodings", RFC 3642, October 2003.

   [RFC4234]  Crocker, D. and P. Overell, "Augmented BNF for Syntax
              Specifications: ABNF", RFC 4234, October 2005.

   [RFC4511]  Sermersheim, J., Ed., "Lightweight Directory Access
              Protocol (LDAP): The Protocol", RFC 4511, June 2006.

   [RFC4513]  Harrison, R. Ed., "Lightweight Directory Access Protocol
              (LDAP): Authentication Methods and Security Mechanisms",
              RFC 4513, June 2006.

   [RFC4520]  Zeilenga, K., "Internet Assigned Numbers Authority (IANA)
              Considerations for the Lightweight Directory Access
              Protocol (LDAP)", BCP 64, RFC 4520, June 2006.







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Appendix A.

   This appendix is informative.

   This appendix provides ABNF [RFC4234] grammars for GSER-based
   [RFC3641] LDAP-specific encodings specified in this document.  These
   grammars where produced using, and relying on, Common Elements for
   GSER Encodings [RFC3642].

A.1.  CertificateExactAssertion

   CertificateExactAssertion = "{" sp cea-serialNumber ","
        sp cea-issuer sp "}"

   cea-serialNumber = id-serialNumber msp CertificateSerialNumber
   cea-issuer = id-issuer msp Name

   id-serialNumber =
        %x73.65.72.69.61.6C.4E.75.6D.62.65.72 ; 'serialNumber'
   id-issuer = %x69.73.73.75.65.72 ; 'issuer'

   Name = id-rdnSequence ":" RDNSequence
   id-rdnSequence = %x72.64.6E.53.65.71.75.65.6E.63.65 ; 'rdnSequence'

   CertificateSerialNumber = INTEGER

A.2.  CertificateAssertion

CertificateAssertion = "{" [ sp ca-serialNumber ]
     [ sep sp ca-issuer ]
     [ sep sp ca-subjectKeyIdentifier ]
     [ sep sp ca-authorityKeyIdentifier ]
     [ sep sp ca-certificateValid ]
     [ sep sp ca-privateKeyValid ]
     [ sep sp ca-subjectPublicKeyAlgID ]
     [ sep sp ca-keyUsage ]
     [ sep sp ca-subjectAltName ]
     [ sep sp ca-policy ]
     [ sep sp ca-pathToName ]
     [ sep sp ca-subject ]
     [ sep sp ca-nameConstraints ] sp "}"

ca-serialNumber = id-serialNumber msp CertificateSerialNumber
ca-issuer = id-issuer msp Name
ca-subjectKeyIdentifier = id-subjectKeyIdentifier msp
     SubjectKeyIdentifier
ca-authorityKeyIdentifier = id-authorityKeyIdentifier msp
     AuthorityKeyIdentifier



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ca-certificateValid = id-certificateValid msp Time
ca-privateKeyValid = id-privateKeyValid msp GeneralizedTime
ca-subjectPublicKeyAlgID = id-subjectPublicKeyAlgID msp
     OBJECT-IDENTIFIER
ca-keyUsage = id-keyUsage msp KeyUsage
ca-subjectAltName = id-subjectAltName msp AltNameType
ca-policy = id-policy msp CertPolicySet
ca-pathToName = id-pathToName msp Name
ca-subject = id-subject msp Name
ca-nameConstraints = id-nameConstraints msp NameConstraintsSyntax

id-subjectKeyIdentifier =
     %x73.75.62.6A.65.63.74.4B.65.79.49.64.65.6E.74.69.66.69.65.72
     ; 'subjectKeyIdentifier'
id-authorityKeyIdentifier =
     %x61.75.74.68.6F.72.69.74.79.4B.65.79.49.64.65.6E.74.69.66.69.65.72
     ; 'authorityKeyIdentifier'
id-certificateValid = %x63.65.72.74.69.66.69.63.61.74.65.56.61.6C.69.64
     ; 'certificateValid'
id-privateKeyValid = %x70.72.69.76.61.74.65.4B.65.79.56.61.6C.69.64
     ; 'privateKeyValid'
id-subjectPublicKeyAlgID  =
     %x73.75.62.6A.65.63.74.50.75.62.6C.69.63.4B.65.79.41.6C.67.49.44
     ; 'subjectPublicKeyAlgID'
id-keyUsage = %x6B.65.79.55.73.61.67.65 ; 'keyUsage'
id-subjectAltName = %x73.75.62.6A.65.63.74.41.6C.74.4E.61.6D.65
     ; 'subjectAltName'
id-policy = %x70.6F.6C.69.63.79 ; 'policy'
id-pathToName = %x70.61.74.68.54.6F.4E.61.6D.65 ; 'pathToName'
id-subject = %x73.75.62.6A.65.63.74 ; 'subject'
id-nameConstraints = %x6E.61.6D.65.43.6F.6E.73.74.72.61.69.6E.74.73
     ; 'nameConstraints'

SubjectKeyIdentifier = KeyIdentifier

KeyIdentifier = OCTET-STRING

AuthorityKeyIdentifier = "{" [ sp aki-keyIdentifier ]
     [ sep sp aki-authorityCertIssuer ]
     [ sep sp aki-authorityCertSerialNumber ] sp "}"

aki-keyIdentifier = id-keyIdentifier msp KeyIdentifier
aki-authorityCertIssuer = id-authorityCertIssuer msp GeneralNames

GeneralNames = "{" sp GeneralName *( "," sp GeneralName ) sp "}"
GeneralName  = gn-otherName
     / gn-rfc822Name
     / gn-dNSName



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RFC 4523                   LDAP X.509 Schema                   June 2006