Lightweight Directory Access Protocol (LDAP) Schema Definitions for X.509 Certificates (original) (raw)

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Network Working Group K. Zeilenga Request for Comments: 4523 OpenLDAP Foundation Obsoletes: 2252, 2256, 2587 June 2006 Category: Standards Track

         Lightweight Directory Access Protocol (LDAP)
           Schema Definitions for X.509 Certificates

Status of This Memo

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2006).

Abstract

This document describes schema for representing X.509 certificates, X.521 security information, and related elements in directories accessible using the Lightweight Directory Access Protocol (LDAP). The LDAP definitions for these X.509 and X.521 schema elements replace those provided in RFCs 2252 and 2256.

1. Introduction

This document provides LDAP [[RFC4510](./rfc4510 ""Lightweight Directory Access Protocol (LDAP): Technical Specification Road Map"")] schema definitions [[RFC4512](./rfc4512 ""Lightweight Directory Access Protocol (LDAP): Directory Information Models"")] for a subset of elements specified in X.509 [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")] and X.521 [[X.521](#ref-X.521 ""The Directory: Selected Object Classes"")], including attribute types for certificates, cross certificate pairs, and certificate revocation lists; matching rules to be used with these attribute types; and related object classes. LDAP syntax definitions are also provided for associated assertion and attribute values.

As the semantics of these elements are as defined in X.509 and X.521, knowledge of X.509 and X.521 is necessary to make use of the LDAP schema definitions provided herein.

This document, together with [[RFC4510](./rfc4510 ""Lightweight Directory Access Protocol (LDAP): Technical Specification Road Map"")], obsoletes RFCs 2252 and 2256 in their entirety. The changes (in this document) made since RFC 2252 and RFC 2256 include:

  -  addition of pkiUser, pkiCA, and deltaCRL classes;

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RFC 4523 LDAP X.509 Schema June 2006

  -  update of attribute types to include equality matching rules in
     accordance with their X.500 specifications;

  -  addition of certificate, certificate pair, certificate list,
     and algorithm identifier matching rules; and

  -  addition of LDAP syntax for assertion syntaxes for these
     matching rules.

This document obsoletes RFC 2587. The X.509 schema descriptions for LDAPv2 [[RFC1777](./rfc1777 ""Lightweight Directory Access Protocol"")] are Historic, as is LDAPv2 [[RFC3494](./rfc3494 ""Lightweight Directory Access Protocol version 2 (LDAPv2) to Historic Status"")].

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 BCP 14 [[RFC2119](./rfc2119 ""Key words for use in RFCs to Indicate Requirement Levels"")].

Schema definitions are provided using LDAP description formats [[RFC4512](./rfc4512 ""Lightweight Directory Access Protocol (LDAP): Directory Information Models"")]. Definitions provided here are formatted (line wrapped) for readability.

2. Syntaxes

This section describes various syntaxes used in LDAP to transfer certificates and related data types.

2.1. Certificate

  ( 1.3.6.1.4.1.1466.115.121.1.8 DESC 'X.509 Certificate' )

A value of this syntax is an X.509 Certificate [X.509, clause 7].

Due to changes made to the definition of a Certificate through time, no LDAP-specific encoding is defined for this syntax. Values of this syntax SHOULD be encoded using Distinguished Encoding Rules (DER) [[X.690](#ref-X.690 ""Specification of ASN.1 encoding rules: Basic Encoding Rules (BER), Canonical Encoding Rules (CER), and Distinguished Encoding Rules (DER)"")] and MUST only be transferred using the ;binary transfer option [[RFC4522](./rfc4522 ""Lightweight Directory Access Protocol (LDAP): The Binary Encoding Option"")]; that is, by requesting and returning values using attribute descriptions such as "userCertificate;binary".

As values of this syntax contain digitally signed data, values of this syntax and the form of each value MUST be preserved as presented.

2.2. CertificateList

  ( 1.3.6.1.4.1.1466.115.121.1.9 DESC 'X.509 Certificate List' )

A value of this syntax is an X.509 CertificateList [X.509, clause 7.3].

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RFC 4523 LDAP X.509 Schema June 2006

Due to changes made to the definition of a CertificateList through time, no LDAP-specific encoding is defined for this syntax. Values of this syntax SHOULD be encoded using DER [[X.690](#ref-X.690 ""Specification of ASN.1 encoding rules: Basic Encoding Rules (BER), Canonical Encoding Rules (CER), and Distinguished Encoding Rules (DER)"")] and MUST only be transferred using the ;binary transfer option [[RFC4522](./rfc4522 ""Lightweight Directory Access Protocol (LDAP): The Binary Encoding Option"")]; that is, by requesting and returning values using attribute descriptions such as "certificateRevocationList;binary".

As values of this syntax contain digitally signed data, values of this syntax and the form of each value MUST be preserved as presented.

2.3. CertificatePair

  ( 1.3.6.1.4.1.1466.115.121.1.10 DESC 'X.509 Certificate Pair' )

A value of this syntax is an X.509 CertificatePair [X.509, clause 11.2.3].

Due to changes made to the definition of an X.509 CertificatePair through time, no LDAP-specific encoding is defined for this syntax. Values of this syntax SHOULD be encoded using DER [[X.690](#ref-X.690 ""Specification of ASN.1 encoding rules: Basic Encoding Rules (BER), Canonical Encoding Rules (CER), and Distinguished Encoding Rules (DER)"")] and MUST only be transferred using the ;binary transfer option [[RFC4522](./rfc4522 ""Lightweight Directory Access Protocol (LDAP): The Binary Encoding Option"")]; that is, by requesting and returning values using attribute descriptions such as "crossCertificatePair;binary".

As values of this syntax contain digitally signed data, values of this syntax and the form of each value MUST be preserved as presented.

2.4. SupportedAlgorithm

  ( 1.3.6.1.4.1.1466.115.121.1.49
       DESC 'X.509 Supported Algorithm' )

A value of this syntax is an X.509 SupportedAlgorithm [X.509, clause 11.2.7].

Due to changes made to the definition of an X.509 SupportedAlgorithm through time, no LDAP-specific encoding is defined for this syntax. Values of this syntax SHOULD be encoded using DER [[X.690](#ref-X.690 ""Specification of ASN.1 encoding rules: Basic Encoding Rules (BER), Canonical Encoding Rules (CER), and Distinguished Encoding Rules (DER)"")] and MUST only be transferred using the ;binary transfer option [[RFC4522](./rfc4522 ""Lightweight Directory Access Protocol (LDAP): The Binary Encoding Option"")]; that is, by requesting and returning values using attribute descriptions such as "supportedAlgorithms;binary".

As values of this syntax contain digitally signed data, values of this syntax and the form of the value MUST be preserved as presented.

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2.5. CertificateExactAssertion

  ( 1.3.6.1.1.15.1 DESC 'X.509 Certificate Exact Assertion' )

A value of this syntax is an X.509 CertificateExactAssertion [X.509, clause 11.3.1]. Values of this syntax MUST be encoded using the Generic String Encoding Rules (GSER) [[RFC3641](./rfc3641 ""Generic String Encoding Rules (GSER) for ASN.1 Types"")]. Appendix A.1 provides an equivalent Augmented Backus-Naur Form (ABNF) [[RFC4234](./rfc4234 ""Augmented BNF for Syntax Specifications: ABNF"")] grammar for this syntax.

2.6. CertificateAssertion

  ( 1.3.6.1.1.15.2 DESC 'X.509 Certificate Assertion' )

A value of this syntax is an X.509 CertificateAssertion [X.509, clause 11.3.2]. Values of this syntax MUST be encoded using GSER [[RFC3641](./rfc3641 ""Generic String Encoding Rules (GSER) for ASN.1 Types"")]. Appendix A.2 provides an equivalent ABNF [[RFC4234](./rfc4234 ""Augmented BNF for Syntax Specifications: ABNF"")] grammar for this syntax.

2.7. CertificatePairExactAssertion

  ( 1.3.6.1.1.15.3
       DESC 'X.509 Certificate Pair Exact Assertion' )

A value of this syntax is an X.509 CertificatePairExactAssertion [X.509, clause 11.3.3]. Values of this syntax MUST be encoded using GSER [[RFC3641](./rfc3641 ""Generic String Encoding Rules (GSER) for ASN.1 Types"")]. Appendix A.3 provides an equivalent ABNF [[RFC4234](./rfc4234 ""Augmented BNF for Syntax Specifications: ABNF"")] grammar for this syntax.

2.8. CertificatePairAssertion

  ( 1.3.6.1.1.15.4 DESC 'X.509 Certificate Pair Assertion' )

A value of this syntax is an X.509 CertificatePairAssertion [X.509, clause 11.3.4]. Values of this syntax MUST be encoded using GSER [[RFC3641](./rfc3641 ""Generic String Encoding Rules (GSER) for ASN.1 Types"")]. Appendix A.4 provides an equivalent ABNF [[RFC4234](./rfc4234 ""Augmented BNF for Syntax Specifications: ABNF"")] grammar for this syntax.

2.9. CertificateListExactAssertion

  ( 1.3.6.1.1.15.5
       DESC 'X.509 Certificate List Exact Assertion' )

A value of this syntax is an X.509 CertificateListExactAssertion [X.509, clause 11.3.5]. Values of this syntax MUST be encoded using GSER [[RFC3641](./rfc3641 ""Generic String Encoding Rules (GSER) for ASN.1 Types"")]. Appendix A.5 provides an equivalent ABNF grammar for this syntax.

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2.10. CertificateListAssertion

  ( 1.3.6.1.1.15.6 DESC 'X.509 Certificate List Assertion' )

A value of this syntax is an X.509 CertificateListAssertion [X.509, clause 11.3.6]. Values of this syntax MUST be encoded using GSER [[RFC3641](./rfc3641 ""Generic String Encoding Rules (GSER) for ASN.1 Types"")]. Appendix A.6 provides an equivalent ABNF [[RFC4234](./rfc4234 ""Augmented BNF for Syntax Specifications: ABNF"")] grammar for this syntax.

2.11. AlgorithmIdentifier

  ( 1.3.6.1.1.15.7 DESC 'X.509 Algorithm Identifier' )

A value of this syntax is an X.509 AlgorithmIdentifier [X.509, Clause 7]. Values of this syntax MUST be encoded using GSER [[RFC3641](./rfc3641 ""Generic String Encoding Rules (GSER) for ASN.1 Types"")].

Appendix A.7 provides an equivalent ABNF [[RFC4234](./rfc4234 ""Augmented BNF for Syntax Specifications: ABNF"")] grammar for this syntax.

3. Matching Rules

This section introduces a set of certificate and related matching rules for use in LDAP. These rules are intended to act in accordance with their X.500 counterparts.

3.1. certificateExactMatch

The certificateExactMatch matching rule compares the presented certificate exact assertion value with an attribute value of the certificate syntax as described in clause 11.3.1 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 2.5.13.34 NAME 'certificateExactMatch'
       DESC 'X.509 Certificate Exact Match'
       SYNTAX 1.3.6.1.1.15.1 )

3.2. certificateMatch

The certificateMatch matching rule compares the presented certificate assertion value with an attribute value of the certificate syntax as described in clause 11.3.2 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 2.5.13.35 NAME 'certificateMatch'
       DESC 'X.509 Certificate Match'
       SYNTAX 1.3.6.1.1.15.2 )

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3.3. certificatePairExactMatch

The certificatePairExactMatch matching rule compares the presented certificate pair exact assertion value with an attribute value of the certificate pair syntax as described in clause 11.3.3 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 2.5.13.36 NAME 'certificatePairExactMatch'
       DESC 'X.509 Certificate Pair Exact Match'
       SYNTAX 1.3.6.1.1.15.3 )

3.4. certificatePairMatch

The certificatePairMatch matching rule compares the presented certificate pair assertion value with an attribute value of the certificate pair syntax as described in clause 11.3.4 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 2.5.13.37 NAME 'certificatePairMatch'
       DESC 'X.509 Certificate Pair Match'
       SYNTAX 1.3.6.1.1.15.4 )

3.5. certificateListExactMatch

The certificateListExactMatch matching rule compares the presented certificate list exact assertion value with an attribute value of the certificate pair syntax as described in clause 11.3.5 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 2.5.13.38 NAME 'certificateListExactMatch'
       DESC 'X.509 Certificate List Exact Match'
       SYNTAX 1.3.6.1.1.15.5 )

3.6. certificateListMatch

The certificateListMatch matching rule compares the presented certificate list assertion value with an attribute value of the certificate pair syntax as described in clause 11.3.6 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 2.5.13.39 NAME 'certificateListMatch'
       DESC 'X.509 Certificate List Match'
       SYNTAX 1.3.6.1.1.15.6 )

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3.7. algorithmIdentifierMatch

The algorithmIdentifierMatch mating rule compares a presented algorithm identifier with an attribute value of the supported algorithm as described in clause 11.3.7 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 2.5.13.40 NAME 'algorithmIdentifier'
       DESC 'X.509 Algorithm Identifier Match'
       SYNTAX 1.3.6.1.1.15.7 )

4. Attribute Types

This section details a set of certificate and related attribute types for use in LDAP.

4.1. userCertificate

The userCertificate attribute holds the X.509 certificates issued to the user by one or more certificate authorities, as discussed in clause 11.2.1 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 2.5.4.36 NAME 'userCertificate'
       DESC 'X.509 user certificate'
       EQUALITY certificateExactMatch
       SYNTAX 1.3.6.1.4.1.1466.115.121.1.8 )

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

4.2. cACertificate

The cACertificate attribute holds the X.509 certificates issued to the certificate authority (CA), as discussed in clause 11.2.2 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 2.5.4.37 NAME 'cACertificate'
       DESC 'X.509 CA certificate'
       EQUALITY certificateExactMatch
       SYNTAX 1.3.6.1.4.1.1466.115.121.1.8 )

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

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4.3. crossCertificatePair

The crossCertificatePair attribute holds an X.509 certificate pair, as discussed in clause 11.2.3 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 2.5.4.40 NAME 'crossCertificatePair'
       DESC 'X.509 cross certificate pair'
       EQUALITY certificatePairExactMatch
       SYNTAX 1.3.6.1.4.1.1466.115.121.1.10 )

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

4.4. certificateRevocationList

The certificateRevocationList attribute holds certificate lists, as discussed in 11.2.4 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 2.5.4.39 NAME 'certificateRevocationList'
       DESC 'X.509 certificate 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 are requested and transferred using the attribute description "certificateRevocationList;binary".

4.5. authorityRevocationList

The authorityRevocationList attribute holds certificate lists, as discussed in 11.2.5 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 2.5.4.38 NAME 'authorityRevocationList'
       DESC 'X.509 authority 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 are requested and transferred using the attribute description "authorityRevocationList;binary".

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4.6. deltaRevocationList

The deltaRevocationList attribute holds certificate lists, as discussed in 11.2.6 of [[X.509](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 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](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 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](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 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](#ref-X.509 ""The Directory: Authentication Framework"")]

  ( 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](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 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](#ref-X.509 ""The Directory: Authentication Framework"")].

  ( 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](#ref-X.521 ""The Directory: Selected Object Classes"")]. 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](#ref-X.521 ""The Directory: Selected Object Classes"")].

  ( 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](#ref-X.521 ""The Directory: Selected Object Classes"")]. 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](#ref-X.521 ""The Directory: Selected Object Classes"")]. 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](./rfc3280 ""Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile"")] apply to LDAP-aware certificate applications. General LDAP security considerations [[RFC4510](./rfc4510 ""Lightweight Directory Access Protocol (LDAP): Technical Specification Road Map"")] 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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transit. Hence, it is generally recommended that implementations make use of authentication and data integrity services in LDAP [[RFC4513](./rfc4513 ""Lightweight Directory Access Protocol (LDAP): Authentication Methods and Security Mechanisms"")][RFC4511].

7. IANA Considerations

7.1. Object Identifier Registration

The IANA has registered an LDAP Object Identifier [[RFC4520](./rfc4520 ""Internet Assigned Numbers Authority (IANA) Considerations for the Lightweight Directory Access Protocol (LDAP)"")] for use in this technical specification.

  Subject: Request for LDAP OID Registration
  Person & email address to contact for further information:
      Kurt Zeilenga <kurt@OpenLDAP.org>
  Specification: [RFC 4523](./rfc4523)
  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 <kurt@OpenLDAP.org>
  Usage: see table
  Specification: [RFC 4523](./rfc4523)
  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](./rfc4234 ""Augmented BNF for Syntax Specifications: ABNF"")] grammars for GSER-based [[RFC3641](./rfc3641 ""Generic String Encoding Rules (GSER) for ASN.1 Types"")] LDAP-specific encodings specified in this document. These grammars where produced using, and relying on, Common Elements for GSER Encodings [[RFC3642](./rfc3642 ""Common Elements of Generic String Encoding Rules (GSER) Encodings"")].

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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RFC 4523 LDAP X.509 Schema June 2006

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

 / gn-x400Address
 / gn-directoryName
 / gn-ediPartyName
 / gn-uniformResourceIdentifier
 / gn-iPAddress
 / gn-registeredID

gn-otherName = id-otherName ":" OtherName gn-rfc822Name = id-rfc822Name ":" IA5String gn-dNSName = id-dNSName ":" IA5String gn-x400Address = id-x400Address ":" ORAddress gn-directoryName = id-directoryName ":" Name gn-ediPartyName = id-ediPartyName ":" EDIPartyName gn-iPAddress = id-iPAddress ":" OCTET-STRING gn-registeredID = gn-id-registeredID ":" OBJECT-IDENTIFIER

gn-uniformResourceIdentifier = id-uniformResourceIdentifier ":" IA5String

id-otherName = %x6F.74.68.65.72.4E.61.6D.65 ; 'otherName' gn-id-registeredID = %x72.65.67.69.73.74.65.72.65.64.49.44 ; 'registeredID'

OtherName = "{" sp on-type-id "," sp on-value sp "}" on-type-id = id-type-id msp OBJECT-IDENTIFIER on-value = id-value msp Value ;; as defined in Section 3 of [RFC3641]

id-type-id = %x74.79.70.65.2D.69.64 ; 'type-id' id-value = %x76.61.6C.75.65 ; 'value'

ORAddress = dquote *SafeIA5Character dquote SafeIA5Character = %x01-21 / %x23-7F / ; ASCII minus dquote dquote dquote ; escaped double quote dquote = %x22 ; '"' (double quote)

;; Note: The rule encodes the x400Address component ;; of a GeneralName as a character string between double quotes. ;; The character string is first derived according to Section 4.1 ;; of [[RFC2156](./rfc2156 ""MIXER (Mime Internet X.400 Enhanced Relay): Mapping between X.400 and RFC 822/MIME"")], and then any embedded double quotes are escaped ;; by being repeated. This resulting string is output between ;; double quotes.

EDIPartyName = "{" [ sp nameAssigner "," ] sp partyName sp "}" nameAssigner = id-nameAssigner msp DirectoryString partyName = id-partyName msp DirectoryString id-nameAssigner = %x6E.61.6D.65.41.73.73.69.67.6E.65.72 ; 'nameAssigner'

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RFC 4523 LDAP X.509 Schema June 2006

id-partyName = %x70.61.72.74.79.4E.61.6D.65 ; 'partyName'

aki-authorityCertSerialNumber = id-authorityCertSerialNumber msp CertificateSerialNumber

id-keyIdentifier = %x6B.65.79.49.64.65.6E.74.69.66.69.65.72 ; 'keyIdentifier' id-authorityCertIssuer = %x61.75.74.68.6F.72.69.74.79.43.65.72.74.49.73.73.75.65.72 ; 'authorityCertIssuer'

id-authorityCertSerialNumber = %x61.75.74.68.6F.72.69.74.79.43 %x65.72.74.53.65.72.69.61.6C.4E.75.6D.62.65.72 ; 'authorityCertSerialNumber'

Time = time-utcTime / time-generalizedTime time-utcTime = id-utcTime ":" UTCTime time-generalizedTime = id-generalizedTime ":" GeneralizedTime id-utcTime = %x75.74.63.54.69.6D.65 ; 'utcTime' id-generalizedTime = %x67.65.6E.65.72.61.6C.69.7A.65.64.54.69.6D.65 ; 'generalizedTime'

KeyUsage = BIT-STRING / key-usage-bit-list key-usage-bit-list = "{" [ sp key-usage *( "," sp key-usage ) ] sp "}"

;; Note: The rule encodes the one bits in ;; a KeyUsage value as a comma separated list of identifiers.

key-usage = id-digitalSignature / id-nonRepudiation / id-keyEncipherment / id-dataEncipherment / id-keyAgreement / id-keyCertSign / id-cRLSign / id-encipherOnly / id-decipherOnly

id-digitalSignature = %x64.69.67.69.74.61.6C.53.69.67.6E.61.74 %x75.72.65 ; 'digitalSignature' id-nonRepudiation = %x6E.6F.6E.52.65.70.75.64.69.61.74.69.6F.6E ; 'nonRepudiation' id-keyEncipherment = %x6B.65.79.45.6E.63.69.70.68.65.72.6D.65.6E.74 ; 'keyEncipherment' id-dataEncipherment = %x64.61.74.61.45.6E.63.69.70.68.65.72.6D.65.6E %x74 ; "dataEncipherment' id-keyAgreement = %x6B.65.79.41.67.72.65.65.6D.65.6E.74 ; 'keyAgreement'

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RFC 4523 LDAP X.509 Schema June 2006

id-keyCertSign = %x6B.65.79.43.65.72.74.53.69.67.6E ; 'keyCertSign' id-cRLSign = %x63.52.4C.53.69.67.6E ; "cRLSign" id-encipherOnly = %x65.6E.63.69.70.68.65.72.4F.6E.6C.79 ; 'encipherOnly' id-decipherOnly = %x64.65.63.69.70.68.65.72.4F.6E.6C.79 ; 'decipherOnly'

AltNameType = ant-builtinNameForm / ant-otherNameForm

ant-builtinNameForm = id-builtinNameForm ":" BuiltinNameForm ant-otherNameForm = id-otherNameForm ":" OBJECT-IDENTIFIER

id-builtinNameForm = %x62.75.69.6C.74.69.6E.4E.61.6D.65.46.6F.72.6D ; 'builtinNameForm' id-otherNameForm = %x6F.74.68.65.72.4E.61.6D.65.46.6F.72.6D ; 'otherNameForm'

BuiltinNameForm = id-rfc822Name / id-dNSName / id-x400Address / id-directoryName / id-ediPartyName / id-uniformResourceIdentifier / id-iPAddress / id-registeredId

id-rfc822Name = %x72.66.63.38.32.32.4E.61.6D.65 ; 'rfc822Name' id-dNSName = %x64.4E.53.4E.61.6D.65 ; 'dNSName' id-x400Address = %x78.34.30.30.41.64.64.72.65.73.73 ; 'x400Address' id-directoryName = %x64.69.72.65.63.74.6F.72.79.4E.61.6D.65 ; 'directoryName' id-ediPartyName = %x65.64.69.50.61.72.74.79.4E.61.6D.65 ; 'ediPartyName' id-iPAddress = %x69.50.41.64.64.72.65.73.73 ; 'iPAddress' id-registeredId = %x72.65.67.69.73.74.65.72.65.64.49.64 ; 'registeredId'

id-uniformResourceIdentifier = %x75.6E.69.66.6F.72.6D.52.65.73.6F.75 %x72.63.65.49.64.65.6E.74.69.66.69.65.72 ; 'uniformResourceIdentifier'

CertPolicySet = "{" sp CertPolicyId *( "," sp CertPolicyId ) sp "}" CertPolicyId = OBJECT-IDENTIFIER

NameConstraintsSyntax = "{" [ sp ncs-permittedSubtrees ] [ sep sp ncs-excludedSubtrees ] sp "}"

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RFC 4523 LDAP X.509 Schema June 2006

ncs-permittedSubtrees = id-permittedSubtrees msp GeneralSubtrees ncs-excludedSubtrees = id-excludedSubtrees msp GeneralSubtrees

id-permittedSubtrees = %x70.65.72.6D.69.74.74.65.64.53.75.62.74.72.65.65.73 ; 'permittedSubtrees' id-excludedSubtrees = %x65.78.63.6C.75.64.65.64.53.75.62.74.72.65.65.73 ; 'excludedSubtrees'

GeneralSubtrees = "{" sp GeneralSubtree *( "," sp GeneralSubtree ) sp "}" GeneralSubtree = "{" sp gs-base [ "," sp gs-minimum ] [ "," sp gs-maximum ] sp "}"

gs-base = id-base msp GeneralName gs-minimum = id-minimum msp BaseDistance gs-maximum = id-maximum msp BaseDistance

id-base = %x62.61.73.65 ; 'base' id-minimum = %x6D.69.6E.69.6D.75.6D ; 'minimum' id-maximum = %x6D.61.78.69.6D.75.6D ; 'maximum'

BaseDistance = INTEGER-0-MAX

A.3. CertificatePairExactAssertion

CertificatePairExactAssertion = "{" [ sp cpea-issuedTo ] [sep sp cpea-issuedBy ] sp "}" ;; At least one of or MUST be present.

cpea-issuedTo = id-issuedToThisCAAssertion msp CertificateExactAssertion cpea-issuedBy = id-issuedByThisCAAssertion msp CertificateExactAssertion

id-issuedToThisCAAssertion = %x69.73.73.75.65.64.54.6F.54.68.69.73 %x43.41.41.73.73.65.72.74.69.6F.6E ; 'issuedToThisCAAssertion' id-issuedByThisCAAssertion = %x69.73.73.75.65.64.42.79.54.68.69.73 %x43.41.41.73.73.65.72.74.69.6F.6E ; 'issuedByThisCAAssertion'

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RFC 4523 LDAP X.509 Schema June 2006

A.4. CertificatePairAssertion

CertificatePairAssertion = "{" [ sp cpa-issuedTo ] [sep sp cpa-issuedBy ] sp "}" ;; At least one of and MUST be present.

cpa-issuedTo = id-issuedToThisCAAssertion msp CertificateAssertion cpa-issuedBy = id-issuedByThisCAAssertion msp CertificateAssertion

A.5. CertificateListExactAssertion

CertificateListExactAssertion = "{" sp clea-issuer "," sp clea-thisUpdate [ "," sp clea-distributionPoint ] sp "}"

clea-issuer = id-issuer msp Name clea-thisUpdate = id-thisUpdate msp Time clea-distributionPoint = id-distributionPoint msp DistributionPointName

id-thisUpdate = %x74.68.69.73.55.70.64.61.74.65 ; 'thisUpdate' id-distributionPoint = %x64.69.73.74.72.69.62.75.74.69.6F.6E.50.6F.69.6E.74 ; 'distributionPoint'

DistributionPointName = dpn-fullName / dpn-nameRelativeToCRLIssuer

dpn-fullName = id-fullName ":" GeneralNames dpn-nameRelativeToCRLIssuer = id-nameRelativeToCRLIssuer ":" RelativeDistinguishedName

id-fullName = %x66.75.6C.6C.4E.61.6D.65 ; 'fullName' id-nameRelativeToCRLIssuer = %x6E.61.6D.65.52.65.6C.61.74.69.76.65 %x54.6F.43.52.4C.49.73.73.75.65.72 ; 'nameRelativeToCRLIssuer'

A.6. CertificateListAssertion

CertificateListAssertion = "{" [ sp cla-issuer ] [ sep sp cla-minCRLNumber ] [ sep sp cla-maxCRLNumber ] [ sep sp cla-reasonFlags ] [ sep sp cla-dateAndTime ] [ sep sp cla-distributionPoint ] [ sep sp cla-authorityKeyIdentifier ] sp "}"

cla-issuer = id-issuer msp Name cla-minCRLNumber = id-minCRLNumber msp CRLNumber cla-maxCRLNumber = id-maxCRLNumber msp CRLNumber

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RFC 4523 LDAP X.509 Schema June 2006

cla-reasonFlags = id-reasonFlags msp ReasonFlags cla-dateAndTime = id-dateAndTime msp Time

cla-distributionPoint = id-distributionPoint msp DistributionPointName

cla-authorityKeyIdentifier = id-authorityKeyIdentifier msp AuthorityKeyIdentifier

id-minCRLNumber = %x6D.69.6E.43.52.4C.4E.75.6D.62.65.72 ; 'minCRLNumber' id-maxCRLNumber = %x6D.61.78.43.52.4C.4E.75.6D.62.65.72 ; 'maxCRLNumber' id-reasonFlags = %x72.65.61.73.6F.6E.46.6C.61.67.73 ; 'reasonFlags' id-dateAndTime = %x64.61.74.65.41.6E.64.54.69.6D.65 ; 'dateAndTime'

CRLNumber = INTEGER-0-MAX

ReasonFlags = BIT-STRING / "{" [ sp reason-flag *( "," sp reason-flag ) ] sp "}"

reason-flag = id-unused / id-keyCompromise / id-cACompromise / id-affiliationChanged / id-superseded / id-cessationOfOperation / id-certificateHold / id-privilegeWithdrawn / id-aACompromise

id-unused = %x75.6E.75.73.65.64 ; 'unused' id-keyCompromise = %x6B.65.79.43.6F.6D.70.72.6F.6D.69.73.65 ; 'keyCompromise' id-cACompromise = %x63.41.43.6F.6D.70.72.6F.6D.69.73.65 ; 'cACompromise' id-affiliationChanged = %x61.66.66.69.6C.69.61.74.69.6F.6E.43.68.61.6E.67.65.64 ; 'affiliationChanged' id-superseded = %x73.75.70.65.72.73.65.64.65.64 ; 'superseded' id-cessationOfOperation = %x63.65.73.73.61.74.69.6F.6E.4F.66.4F.70.65.72.61.74.69.6F.6E ; 'cessationOfOperation' id-certificateHold = %x63.65.72.74.69.66.69.63.61.74.65.48.6F.6C.64 ; 'certificateHold' id-privilegeWithdrawn = %x70.72.69.76.69.6C.65.67.65.57.69.74.68.64.72.61.77.6E ; 'privilegeWithdrawn'

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RFC 4523 LDAP X.509 Schema June 2006

id-aACompromise = %x61.41.43.6F.6D.70.72.6F.6D.69.73.65 ; 'aACompromise'

A.7. AlgorithmIdentifier

AlgorithmIdentifier = "{" sp ai-algorithm [ "," sp ai-parameters ] sp "}"

ai-algorithm = id-algorithm msp OBJECT-IDENTIFIER ai-parameters = id-parameters msp Value id-algorithm = %x61.6C.67.6F.72.69.74.68.6D ; 'algorithm' id-parameters = %x70.61.72.61.6D.65.74.65.72.73 ; 'parameters'

Author's Address

Kurt D. Zeilenga OpenLDAP Foundation

EMail: Kurt@OpenLDAP.org

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RFC 4523 LDAP X.509 Schema June 2006

Full Copyright Statement

Copyright (C) The Internet Society (2006).

This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights.

This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

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Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr.

The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org.

Acknowledgement

Funding for the RFC Editor function is provided by the IETF Administrative Support Activity (IASA).

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