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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] schema definitions [RFC4512]
for a subset of elements specified in X.509 [X.509] and X.521
[X.521], 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], 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] are Historic, as is LDAPv2 [RFC3494].

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].

Schema definitions are provided using LDAP description formats
[RFC4512]. 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] and MUST only be transferred using the ;binary transfer
option [RFC4522]; 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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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] and MUST only be
transferred using the ;binary transfer option [RFC4522]; 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] and MUST
only be transferred using the ;binary transfer option [RFC4522]; 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] and MUST
only be transferred using the ;binary transfer option [RFC4522]; 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]. Appendix A.1
provides an equivalent Augmented Backus-Naur Form (ABNF) [RFC4234]
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]. Appendix A.2 provides an equivalent ABNF [RFC4234]
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]. Appendix A.3 provides an equivalent ABNF [RFC4234]
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]. Appendix A.4 provides an equivalent ABNF [RFC4234]
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]. 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]. Appendix A.6 provides an equivalent ABNF [RFC4234]
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].

Appendix A.7 provides an equivalent ABNF [RFC4234] 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].

( 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].

( 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].

( 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].

( 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].

( 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].

( 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].

( 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].

( 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].

( 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].

( 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].

( 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].

( 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].

( 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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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
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
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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RFC 4523 LDAP X.509 Schema June 2006


[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


/ 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], 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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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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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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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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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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Intellectual Property Rights or other rights that might be claimed to
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this document or the extent to which any license under such rights
might or might not be available; nor does it represent that it has
made any independent effort to identify any such rights. Information
on the procedures with respect to rights in RFC documents can be
found in BCP 78 and BCP 79.

Copies of IPR disclosures made to the IETF Secretariat and any
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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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