Network Working Group P. Gietz
Internet-Draft DAASI International GmbH
Expires: May 4, 2003 N. Klasen
Avinci
November 3, 2002
An LDAPv3 Schema for X.509 Certificates
draft-klasen-ldap-x509certificate-schema-01
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
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Internet-Drafts are draft documents valid for a maximum of six months
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The list of current Internet-Drafts can be accessed at http://
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This Internet-Draft will expire on May 4, 2003.
Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved.
Abstract
This document describes an LDAP schema which can be used to implement
a certificate store for X.509 certificates. Specifically, a
structural object class for a X.509 certificate is defined. Key
fields of a certificate are stored in LDAP attributes so that
applications can easily retrieve the certificates needed by using
basic LDAP search filters. Multiple certificates for a single entity
can be stored and retrieved.
Conventions used in this document
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
The following syntax specifications use the augmented Backus-Naur
Form (ABNF) as described in [RFC2234].
Schema definitions are provided using LDAPv3 description formats
[RFC2252]. Definitions provided here are formatted (line wrapped)
for readability.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . 5
2. Comparison with Values Return Filter Control . . . . . . . 5
3. Comparision with component matching approach . . . . . . . 6
4. The x509certificate object class and its attribute types . 6
4.1 Attributes for mandatory fields of an X.509 certificate . 7
4.1.1 X.509 version . . . . . . . . . . . . . . . . . . . . . . 7
4.1.2 Serial number . . . . . . . . . . . . . . . . . . . . . . 7
4.1.3 Signature algorithm . . . . . . . . . . . . . . . . . . . 7
4.1.4 Issuer . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1.5 Validity . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1.6 Subject . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1.7 Subject public key info algorithm . . . . . . . . . . . . 9
4.2 Attributes for selected extensions . . . . . . . . . . . . 9
4.2.1 Authority key identifier extension . . . . . . . . . . . . 10
4.2.1.1 Authority key identifier . . . . . . . . . . . . . . . . . 10
4.2.1.2 Authority cert issuer . . . . . . . . . . . . . . . . . . 10
4.2.1.3 Authority cert serial number . . . . . . . . . . . . . . . 11
4.2.2 Subject key identifier extension . . . . . . . . . . . . . 11
4.2.3 Key usage extension . . . . . . . . . . . . . . . . . . . 11
4.2.4 Policy information identifier extension . . . . . . . . . 12
4.2.5 Subject alternative name extension . . . . . . . . . . . . 12
4.2.5.1 Subject RFC822 name . . . . . . . . . . . . . . . . . . . 12
4.2.5.2 Subject DNS name . . . . . . . . . . . . . . . . . . . . . 13
4.2.5.3 Subject directory name . . . . . . . . . . . . . . . . . . 13
4.2.5.4 Subject Uniform Resource Identifier . . . . . . . . . . . 13
4.2.5.5 Subject IP address . . . . . . . . . . . . . . . . . . . . 14
4.2.5.6 Subject registered ID . . . . . . . . . . . . . . . . . . 14
4.2.6 Isssuer alternatvie name extension . . . . . . . . . . . . 14
4.2.6.1 Issuer RFC 822 name . . . . . . . . . . . . . . . . . . . 14
4.2.6.2 Issuer DNS name . . . . . . . . . . . . . . . . . . . . . 15
4.2.6.3 Issuer directory name . . . . . . . . . . . . . . . . . . 15
4.2.6.4 Issuer Uniform Resource Identifier . . . . . . . . . . . . 15
4.2.6.5 Issuer IP address . . . . . . . . . . . . . . . . . . . . 16
4.2.6.6 Issuer registered ID . . . . . . . . . . . . . . . . . . . 16
4.2.7 Extended key usage extension . . . . . . . . . . . . . . . 16
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4.2.8 CRL distribution points extension . . . . . . . . . . . . 16
4.3 Additional attributes . . . . . . . . . . . . . . . . . . 17
4.3.1 Certificate location . . . . . . . . . . . . . . . . . . . 17
4.3.2 Certificate holder . . . . . . . . . . . . . . . . . . . . 17
4.3.3 Email addresses . . . . . . . . . . . . . . . . . . . . . 17
4.4 x509certificate object class . . . . . . . . . . . . . . . 18
4.5 x509certificateHolder object class . . . . . . . . . . . . 19
5. DIT Structure and Naming . . . . . . . . . . . . . . . . . 19
6. Security Considerations . . . . . . . . . . . . . . . . . 20
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . 21
References . . . . . . . . . . . . . . . . . . . . . . . . 21
Authors' Addresses . . . . . . . . . . . . . . . . . . . . 23
A. Sample directory entries . . . . . . . . . . . . . . . . . 23
B. Sample searches . . . . . . . . . . . . . . . . . . . . . 26
C. Changes from previous Drafts . . . . . . . . . . . . . . . 26
C.1 Changes in Draft 01 . . . . . . . . . . . . . . . . . . . 26
Full Copyright Statement . . . . . . . . . . . . . . . . . 28
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1. Introduction
A key component in the wide-spread adoption of a PKI infrastructure
is the general availabilty of public key and their certificates.
Today, certificates are often published in an X.500 compliant
directory service. These directories are accessed by applications
using the LDAP v3 [RFC3377] protocol. An LDAPv3 schema for PKI
repository objects is specified in [pkix-ldap-schema], where a set of
object classes, attribute types, syntaxes, and extended matching
rules are defined. For storing certificates, the "userCertificate"
and "cACertificate" attribute types are used. All certificates of an
entity are stored as values in these multi-valued attributes. This
solution has a serious drawback. In LDAP, the smallest granularity
of data access is the attribute. The directory server will therefore
always return the full list of certificates of an entry to clients
dealing with certificates. If the number of certificates for an
entity is large this will result in considerable overhead and burden
to the client.
This document proposes the use of the x509certificate structural
object class for storing certificates. Each certificate will be
stored in a separate entry in the directory. Fields of certificates
which are needed to identify a certificate and those which are often
used in searching for an appropriate certificate, are extracted from
the certificate and stored as attributes of the entry. Applications
can thus search for specific certificates with simple LDAP filters.
This approach could be named a metadata approach, since data
(attributes) about data (certificate) are stored. The use of simple
attributes also makes a large scale widely distributed certificate
repository service possible by using an indexing service based on The
Common Indexing Protocol (CIP) [RFC2651].
Two alternative approaches are discussed in the next two sections.
2. Comparison with Values Return Filter Control
In [matchedval] a control has been defined that allows for only a
subset of values of a specified attribute to be returned from a
matching entry, by defining a filter for the returned values. In
this section, this approach is compared with the one proposed in this
document.
The major benefit of the Values Return Filter Control is that it does
not require any changes to the DIT. While it is a simple matter to
modify the DIT in such a way that all certificate information is
removed from the entries and placed in the container directly beneath
the entries according to the definitions of this specification, it is
less simple to simultaneously modify all of the applications that
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depend on certificates being stored in the entry. Thus, it may be
desirable to duplicate the certificate information, by having it
appear in the entry, as well as in the container beneath the entry
for a short period of time, in order to allow for migration of the
applications to the new LDAP schema. As in any situation in which
information is duplicated, great care must be taken in order to
ensure the integrity of the information.
There are several advantages in using the x509certificate object
class. No special matching rules are needed to retrieve a specific
certificate. Any field in the certificate can be used in the search
filter. Even information that doesn't appear in the certificate can
be used in a search filter. It is easier to remove certificates from
the DIT, since the entire certificate BER/DER encoding does not have
to be supplied in the modify operation. Searches that don't need
extensible matching rules and Values Return Filter Control will
perform faster.
Another advantage of the solution proposed here is that it will not
be necessary to modify existing server implementations to support
this schema. The extended matching rules proposed in [pkix-ldap-
schema] would require substantial changes in the servers' indexing
mechanisms. In contrast, servers implementing the x509certificate
schema can easily levarage their indexing support for standard LDAPv3
syntaxes.
A CIP based indexing system for a wide scale distributed certificate
repository will only be possible by using the solution proposed here.
3. Comparision with component matching approach
[componentmatch] defines a new mechanism for matching in complex
syntaxes, by defining generic matching rules that can match any user
selected component parts in an attribute value of any arbitrarily
complex attribute syntax. We believe that this might be the proper
way to solve search problems in the longer term, but that it will
take a long time untill such ASN.1 based mechanisms will be
implemented in LDAP servers and clients. Even if this has happened
the mechanism proposed here, will still be usefull in the frame of
CIP. A simple and easy to implement mechanism is needed today and
this is what this memo wants to provide.
4. The x509certificate object class and its attribute types
The description of all attributes with relevance to fields of an
X.509 certificate include a respective reference to [X.509-2000] and
to [RFC3280].
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4.1 Attributes for mandatory fields of an X.509 certificate
4.1.1 X.509 version
Version of the encoded certificate.
( 1.3.6.1.4.1.10126.1.5.3.1
NAME 'x509version'
DESC 'Version of the certificate, X.509(2000) 7,
RFC3280 4.1.2.1'
EQUALITY integerMatch
ORDERING integerOrderingMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.27
SINGLE-VALUE )
Values of this attribute may either be 0, 1, or 2 correspoding to
X.509 v1, v2 or v3.
4.1.2 Serial number
The serial number is an integer assigned by the CA to each
certificate. It is unique for each certificate issued by a given CA
(i.e., the issuer name and serial number uniquely identify a
certificate).
( 1.3.6.1.4.1.10126.1.5.3.2
NAME 'x509serialNumber'
DESC 'Unique integer for each cerfiticate issued by a
particular CA, X.509(2000) 7, RFC3280 4.1.2.2'
EQUALITY integerMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.27
SINGLE-VALUE )
4.1.3 Signature algorithm
OID identifying the algorithm used by the CA in signing the
certificate.
( 1.3.6.1.4.1.10126.1.5.3.3
NAME 'x509signatureAlgorithm'
DESC 'OID of the algorithm used by the CA in
signing the certificate, X.509(2000) 7, RFC3280 4.1.2.3'
EQUALITY objectIdentifierMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.38
SINGLE-VALUE )
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4.1.4 Issuer
String representation of the issuer's distinguished name.
( 1.3.6.1.4.1.10126.1.5.3.4
NAME 'x509issuer'
DESC 'Distinguished name of the entity who has signed and
issued the certificate, X.509(2000) 7, RFC3280 4.1.2.4'
EQUALITY distinguishedNameMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.12
SINGLE-VALUE )
Values of this attribute type must be encoded according to the syntax
given in [RFC2253].
4.1.5 Validity
The "validity" attribute in an X.509 certificate consists of an ASN.1
sequence of two timestamps which define the begin and end of the
certificate's validity period. This sequence has been split up into
two seperate attributes "x509validityNotBefore" and
"x509validityNotAfter". The times are represented in string form as
defined in [RFC2252].
( 1.3.6.1.4.1.10126.1.5.3.5
NAME 'x509validityNotBefore'
DESC 'Date on which the certificate validity period begins,
X.509(2000) 7, RFC3280 4.1.2.5'
EQUALITY generalizedTimeMatch
ORDERING generalizedTimeOrderingMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.24
SINGLE-VALUE )
( 1.3.6.1.4.1.10126.1.5.3.6
NAME 'x509validityNotAfter'
DESC 'Date on which the certificate validity period ends,
X.509(2000) 7, RFC3280 4.1.2.5'
EQUALITY generalizedTimeMatch
ORDERING generalizedTimeOrderingMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.24
SINGLE-VALUE )
4.1.6 Subject
String representation of the subject's distinguished name.
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( 1.3.6.1.4.1.10126.1.5.3.7
NAME 'x509subject'
DESC 'Distinguished name of the entity associated with this
public-key, X.509(2000) 7, RFC3280 4.1.2.6'
EQUALITY distinguishedNameMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.12
SINGLE-VALUE )
Values of this attribute type must be encoded according to the syntax
given in [RFC2253].
4.1.7 Subject public key info algorithm
OID of the algorithm of which the certified public key is an instance
of.
( 1.3.6.1.4.1.10126.1.5.3.8
NAME 'x509subjectPublicKeyInfoAlgorithm'
DESC 'OID of the algorithm which this public key is an
instance of, X.509(2000) 7, RFC3280 4.1.2.7'
EQUALITY objectIdentifierMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.38
SINGLE-VALUE )
4.2 Attributes for selected extensions
As this specification intends to only facilitate applications in
finding certificates, only those extensions have to be defined that
might be searched for. Thus extensions described in [RFC3280] like
the following are not dealt with here:
o private key usage period extension
o policy mappings extension
o subject directory attributes extension
o pathLenConstraint of basic constraints extension
o name constraints extensions
o policy constraints extensions
o inhibit any policy extension
o freshest CRL extension
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o authority information access extension
o subject information access extension
4.2.1 Authority key identifier extension
This attribute identifies the public key to be used to verify the
signature on this certificate. The key may be identified by an
explicit key identifier in the keyIdentifier component, by
identification of a certificate for the key (giving certificate
issuer in the authorityCertIssuer component and certificate serial
number in the authorityCertSerialNumber component), or by both
explicit key identifier and identification of a certificate for the
key.
4.2.1.1 Authority key identifier
( 1.3.6.1.4.1.10126.1.5.3.11
NAME 'x509authorityKeyIdentifier'
DESC 'keyIdentifier field of the authorityKeyIdentifier
extension, X.509(2000) 8.2.2.1, RFC3280 4.2.1.1'
EQUALITY octetStringMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.40
SINGLE-VALUE )
4.2.1.2 Authority cert issuer
( 1.3.6.1.4.1.10126.1.5.3.12
NAME 'x509authorityCertIssuer'
DESC 'authorityCertIssuer field of the authorityKeyIdentifier
extension, X.509(2000) 8.2.2.1, RFC3280 4.2.1.1'
EQUALITY distinguishedNameMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.12
SINGLE-VALUE )
In this specification, only the "Name" choice, encoded according to
[RFC2253], of the "GeneralName" type may be used.
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4.2.1.3 Authority cert serial number
( 1.3.6.1.4.1.10126.1.5.3.13
NAME 'x509authorityCertSerialNumber'
DESC 'authorityCertSerialNumber field of the
authorityKeyIdentifier extension, X.509(2000) 8.2.2.1,
RFC3280 4.2.1.1'
EQUALITY integerMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.27
SINGLE-VALUE )
4.2.2 Subject key identifier extension
This attribute identifies the public key being certified. It enables
distinct keys used by the same subject to be differentiated.
( 1.3.6.1.4.1.10126.1.5.3.14
NAME 'x509subjectKeyIdentifier'
DESC 'Key identifier which must be unique with respect to all
key identifiers for the subject, X.509(2000) 8.2.2.2,
RFC3280 4.2.1.2'
EQUALITY octetStringMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.40
SINGLE-VALUE )
4.2.3 Key usage extension
This attribute defines the purpose (e.g., encipherment, signature,
certificate signing) of the key contained in the certificate.
( 1.3.6.1.4.1.10126.1.5.3.15
NAME 'x509keyUsage'
DESC 'Purpose for which the certified public key is used,
X.509(2000) 8.2.2.3, RFC3280 4.2.1.3'
EQUALITY caseIgnoreMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
Values of this type are encoded according to the following BNF, so
that each value corresponds to the respective bit in the ASN.1
"KeyUsage" bitstring:
x509keyUsage-value ="digitalSignature" / "nonRepudiation" /
"keyEncipherment" / "dataEncipherment" / "keyAgreement" /
"keyCertSign" / "cRLSign" / "encipherOnly" / "decipherOnly"
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4.2.4 Policy information identifier extension
This attribute contains OIDs which indicate the policy under which
the certificate has been issued and the purposes for which the
certificate may be used.
( 1.3.6.1.4.1.10126.1.5.3.16
NAME 'x509policyInformationIdentifier'
DESC 'OID which indicates the policy under which the
certificate has been issued and the purposes for which
the certificate may be used, X.509(2000) 8.2.2.6, RFC3280
4.2.1.5'
EQUALITY objectIdentifierMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.38
SINGLE-VALUE )
4.2.5 Subject alternative name extension
The subject alternative name extension allows additional identities
to be bound to the subject of the certificate. Separate attribute
types are defined for all c hoices of the ASN.1 type "GeneralName"
except for "otherName", "x400Address" and "ediPartyName".
4.2.5.1 Subject RFC822 name
( 1.3.6.1.4.1.10126.1.5.3.17
NAME 'x509subjectAltNameRfc822Name'
DESC 'Internet electronic mail address, X.509(2000) 8.3.2.1,
RFC3280 4.2.1.7'
EQUALITY caseIgnoreMatch
SUBSTR caseIgnoreSubstringsMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )
Values of this attribute must be encoded according to the syntax
given in [RFC0822].
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4.2.5.2 Subject DNS name
( 1.3.6.1.4.1.10126.1.5.3.18
NAME 'x509subjectAltNameDnsName'
DESC 'Internet domain name, X.509(2000) 8.3.2.1, RFC3280
4.2.1.7'
EQUALITY caseIgnoreMatch
SUBSTR caseIgnoreSubstringsMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )
Values of this attribute must be encoded as Internet domain names in
accordance with [RFC1035].
4.2.5.3 Subject directory name
( 1.3.6.1.4.1.10126.1.5.3.19
NAME 'x509subjectAltNameDirectoryName'
DESC 'Distinguished name, X.509(2000) 8.3.2.1, RFC3280
4.2.1.7'
EQUALITY distinguishedNameMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.12 )
Values of this attribute type must be encoded according to the syntax
given in [RFC2253].
4.2.5.4 Subject Uniform Resource Identifier
( 1.3.6.1.4.1.10126.1.5.3.20
NAME 'x509subjectAltNameUniformResourceIdentifier'
DESC 'Uniform Resource Identifier for the World-Wide Web,
X.509(2000) 8.3.2.1, RFC3280 4.2.1.7'
EQUALITY caseExactMatch
SUBSTR caseExactSubstringsMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )
Values of this attribute must be encoded according to the syntax
given in [RFC2396].
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4.2.5.5 Subject IP address
( 1.3.6.1.4.1.10126.1.5.3.21
NAME 'x509subjectAltNameIpAddress'
DESC 'Internet Protocol address, X.509(2000) 8.3.2.1, RFC3280
4.2.1.7'
EQUALITY caseIgnoreMatch
SUBSTR caseIgnoreSubstringsMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )
Values of this attribute type must be stored in the syntax given in
Appendix B of [RFC2373].
4.2.5.6 Subject registered ID
( 1.3.6.1.4.1.10126.1.5.3.22
NAME 'x509subjectAltNameRegisteredID'
DESC 'OID of any registered object, X.509(2000) 8.3.2.1,
RFC3280 4.2.1.7'
EQUALITY objectIdentifierMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.38 )
registeredID is an identifier of any registered object assigned in
accordance with ITU-T Rec. X.660.
4.2.6 Isssuer alternatvie name extension
The issuer alternative names extension allows additional identities
to be bound to the subject of the certificate. Separate attribute
types are defined for all choices of the ASN.1 type "GeneralName"
except for "otherName", "x400Address" and "ediPartyName".
4.2.6.1 Issuer RFC 822 name
( 1.3.6.1.4.1.10126.1.5.3.23
NAME 'x509isssuerAltNameRfc822Name'
DESC 'Internet electronic mail address, X.509(2000) 8.3.2.2,
RFC3280 4.2.1.8'
EQUALITY caseIgnoreMatch
SUBSTR caseIgnoreSubstringsMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )
Values of this attribute must be encoded according to the syntax
given in [RFC0822].
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4.2.6.2 Issuer DNS name
( 1.3.6.1.4.1.10126.1.5.3.24
NAME 'x509isssuerAltNameDnsName'
DESC 'Internet domain name, X.509(2000) 8.3.2.2, RFC3280
4.2.1.8'
EQUALITY caseIgnoreMatch
SUBSTR caseIgnoreSubstringsMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )
Values of this attribute must be encoded as Internet domain names in
accordance with [RFC1035].
4.2.6.3 Issuer directory name
( 1.3.6.1.4.1.10126.1.5.3.25
NAME 'x509isssuerAltNameDirectoryName'
DESC 'Distinguished name, X.509(2000) 8.3.2.2, RFC3280
4.2.1.8'
EQUALITY distinguishedNameMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.12 )
Values of this attribute type must be encoded according to the syntax
given in [RFC2253].
4.2.6.4 Issuer Uniform Resource Identifier
( 1.3.6.1.4.1.10126.1.5.3.26
NAME 'x509isssuerAltNameUniformResourceIdentifier'
DESC 'Uniform Resource Identifier for the World-Wide Web,
X.509(2000) 8.3.2.2, RFC3280 4.2.1.8'
EQUALITY caseExactMatch
SUBSTR caseExactSubstringsMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )
Values of this attribute must be encoded according to the syntax
given in [RFC2396].
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4.2.6.5 Issuer IP address
( 1.3.6.1.4.1.10126.1.5.3.27
NAME 'x509isssuerAltNameIpAddress'
DESC 'Internet Protocol address, X.509(2000) 8.3.2.2, RFC3280
4.2.1.8'
EQUALITY caseIgnoreMatch
SUBSTR caseIgnoreSubstringsMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )
Values of this attribute type must be stored in the syntax given in
Appendix B of [RFC2373].
4.2.6.6 Issuer registered ID
( 1.3.6.1.4.1.10126.1.5.3.28
NAME 'x509isssuerAltNameRegisteredID'
DESC 'OID of any registered object, X.509(2000) 8.3.2.2,
RFC3280 4.2.1.8'
EQUALITY objectIdentifierMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.38 )
registeredID is an identifier of any registered object assigned in
accordance with ITU-T Rec. X.660.
4.2.7 Extended key usage extension
This attribute indicates one or more purposes for which the certified
public key may be used, in addition to or in place of the basic
purposes indicated in the "x509keyUsage" attribute. These purposes
are identified by their OID.
( 1.3.6.1.4.1.10126.1.5.3.30
NAME 'x509extKeyUsage'
DESC 'Purposes for which the certified public key may be used
(identified by OID), X.509(2000) 8.2.2.4, RFC3280
4.2.1.13'
EQUALITY objectIdentifierMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.38 )
4.2.8 CRL distribution points extension
This attribute identifies how CRL information for this certifacte can
be obtained.
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( 1.3.6.1.4.1.10126.1.5.3.31
NAME 'x509cRLDistributionPointURI'
DESC 'DistributionPointName of type URI, X.509(2000) 8.6.2.1,
RFC3280 4.2.1.14'
EQUALITY caseExactMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )
In this specification, only the "uniformResourceIdentifier" choice of
"distributionPoint.fullName" field is supported. If this attribute
exists in an entry, both the "reasons" and "cRLIssuer" fields MUST be
absent from the certificate, i.e. the CRL distributed by the
distribution point contains revocations for all revocation reasons
and the CRL issuer is identical to the certificate issuer.
Values of this attribute must be encoded according to the URI syntax
given in [RFC2396].
4.3 Additional attributes
4.3.1 Certificate location
( 1.3.6.1.4.1.10126.1.5.4.71
NAME 'x509certificateLocation'
DESC 'Pointer to a x509certificate Entry'
EQUALITY distinguishedNameMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.12 )
4.3.2 Certificate holder
This attribute contains a pointer to the directory entry of the end
entity to which this certificate was issued. Thus it is possible to
link a certificate entry in a certificate repository to, e.g., a
white pages entry of the subject.
( 1.3.6.1.4.1.10126.1.5.4.73
NAME 'x509certificateHolder'
DESC 'Pointer to the directory entry of the end entity to which this certificate
was issued'
EQUALITY distinguishedNameMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.12 )
4.3.3 Email addresses
The "mail" (0.9.2342.19200300.100.1.3) attribute from [RFC2798] is
used to store the subject's email address. This attribute MUST be
populated with the values from a subject alternative name extension
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of type rfc822Name if such an extension is present. Legacy
applications conforming to [RFC2312] include an "EmailAddress"
(1.2.840.113549.1.9.1) attribute in the subject's distinguished name.
If the subject alternative name extension is absent from the
certificate, this value MUST be used to populate the "mail"
attribute.
4.4 x509certificate object class
This structural object class contains the fields of an X.509
certificate that are used in searches as attributes.
( 1.3.6.1.4.1.10126.1.5.4.2.1
NAME 'x509certificate'
STRUCTURAL
MUST ( x509serialNumber $ x509signatureAlgorithm $ x509issuer $
x509validityNotBefore $ x509validityNotAfter $ x509subject $
x509subjectPublicKeyInfoAlgorithm )
MAY ( mail $ x509authorityKeyIdentifier $
x509authorityCertIssuer $ x509authorityCertSerialNumber $
x509subjectKeyIdentifier $ x509keyUsage $
x509policyInformationIdentifier $
x509subjectAltNameRfc822Name $ x509subjectAltNameDnsName $
x509subjectAltNameDirectoryName $ x509subjectAltNameURI $
x509subjectAltNameIpAddress $
x509subjectAltNameRegisteredID $
x509isssuerAltNameRfc822Name $ x509isssuerAltNameDnsName $
x509isssuerAltNameDirectoryName $ x509isssuerAltNameURI $
x509isssuerAltNameIpAddress $
x509isssuerAltNameRegisteredID $
x509extKeyUsage $
x509cRLDistributionPoint $ x509certificateHolder) )
Entries of this structural object class MUST also have one of the
following auxiliary object classes: "pkiUser" or "pkiCA". This way,
the entry can contain the certificate in the "userCertificate" or
"cacertificate" attribute.
These object classes and attribute types are chosen to allow
interoperability with older clients. As defined in [pkix-ldap-
schema], the "pkiUser" and "pkiCA" object classes include the
"userCertificate" and respectivly "cacertificate" attributes as
optional attribute. Furthermore, both attributes are multi-valued.
For the purpose of this specification, each entry with a structural
objectclass of x509certificate MUST have one and only one value of
the userCertificate attribute or caCertificate attribute,
respectively.
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4.5 x509certificateHolder object class
This auxiliary object class has an attribute that contains a pointer
on an entry with x509certicate objectclass. Thus it is possible to
link, e.g., an entry of a white pages directory to an entry in a
certificate store.
( 1.3.6.1.4.1.10126.1.5.4.2.2
NAME 'x509certificateHolder'
AUXILIARY
MAY ( x509certificateLocation ) )
5. DIT Structure and Naming
If the schema presented in this document is used to store certificate
information in a directory that contains entries for organizations,
persons, services, etc., each certificate belonging to an entity
SHOULD be stored as a direct subordinate to the entity's entry. In
this case, these entries MUST be named by a multi-valued RDN formed
by the certificate issuer and serial number, as this is the only way
to enforce unique RDN under the siblings. This is expressed in the
following name form:
---------------------------------------------------------------------
( 1.3.6.1.4.1.10126.1.5.5.1
NAME "x509certificate nameform"
OC x509certificate
MUST ( x509serialNumber $ x509issuer ) )
certificate name form
---------------------------------------------------------------------
For public directories of CAs that, besides the data stored in the
certificates, do not hold any additional data about end entities the
folloing DIT structure might be preferable. Entries for certificates
are stored directly below the issuing CA's entry. In this case these
entries SHOULD be named by the certificate serial number. This is
expressed in the following name form:
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---------------------------------------------------------------------
( 1.3.6.1.4.1.10126.1.5.5.2
NAME "x509certificate alternate nameform"
OC x509certificate
MUST x509serial )
certificate alternate name form
---------------------------------------------------------------------
Care must be taken when encoding DNs that contain an x509issuer
attribute. Such a value is a string representation according to
[RFC2253]. These strings contain RFC2253 special characters and must
therefore be escaped. For example, the issuer name in a certificate
may be:
x509issuer: OU=VeriSign Trust Network,OU=(c) 1998 VeriSign\2c Inc. -
For authorized use only,OU=Class 1 Public Primary Certification Au
thority - G2,O=VeriSign\2c Inc.,C=US
When used in a DN, this will be appear as:
dn: x509serial=123456+x509issuer=OU\3dVeriSign Trust Network \2cOU
\3d(c) 1998 VeriSign\5c\2c Inc. - For authorized use only\2cOU\3d
Class 1 Public Primary Certification Authority - G2\2cO\3dVeriSig
n\5c\2c Inc.\2cC\3dUS,cn=Joe Example,...
6. Security Considerations
Attributes of directory entries are used to provide descriptive
information about the real-world objects they represent which can be
people, organizations, or devices. Most countries have privacy laws
regarding the publication of information about people.
Without additional mechanisms such as Operation Signatures [RFC2649]
which allow a client to verify the origin and integrity of the data
contained in the attributes defined in this document, a client MUST
NOT treat this data as authentic. Clients MUST only use - after
proper validation - the data which they obtained directly from the
certificate. Directory administrators MAY deploy ACLs which limit
access to the attributes defined in this document to search filters.
Transfer of cleartext passwords is strongly discouraged where the
underlying transport service cannot guarantee confidentiality and may
result in disclosure of the password to unauthorized parties.
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In order to protect the directory and its contents, strong
authentication MUST have been used to identify the Client when an
update operation is requested.
7. Acknowledgements
This document borrows from a number of IETF documents, including
[certinfo-schema].
The authors wish to thank Michael Str÷der for his significant
contribution to this document.
This work is part of the DFN Project "Ausbau und Weiterbetrieb eines
Directory Kompetenzzentrums" funded by the German Ministry of
Research (BMBF).
This document has been written in XML according to the DTD specified
in RFC2629. xml2rfc has been used to generate an RFC2033 compliant
plain text form. The XML source and a HTML version are available on
request.
References
[RFC0822] Crocker, D., "Standard for the format of ARPA
Internet text messages", STD 11, RFC 822, August
1982.
[RFC1035] Mockapetris, P., "Domain names - implementation
and specification", STD 13, RFC 1035, November
1987.
[RFC2119] Bradner, S., "Key words for use in RFCs to
Indicate Requirement Levels", BCP 14, RFC 2119,
March 1997.
[RFC2234] Crocker, D. and P. Overell, "Augmented BNF for
Syntax Specifications: ABNF", RFC 2234, November
1997.
[RFC2252] Wahl, M., Coulbeck, A., Howes, T. and S. Kille,
"Lightweight Directory Access Protocol (v3):
Attribute Syntax Definitions", RFC 2252, December
1997.
[RFC2253] Wahl, M., Kille, S. and T. Howes, "Lightweight
Directory Access Protocol (v3): UTF-8 String
Representation of Distinguished Names", RFC 2253,
December 1997.
Gietz & Klasen Expires May 4, 2003 [Page 20]
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[RFC2256] Wahl, M., "A Summary of the X.500(96) User Schema
for use with LDAPv3", RFC 2256, December 1997.
[RFC2312] Dusse, S., Hoffman, P., Ramsdell, B. and J.
Weinstein, "S/MIME Version 2 Certificate
Handling", RFC 2312, March 1998.
[RFC2373] Hinden, R. and S. Deering, "IP Version 6
Addressing Architecture", RFC 2373, July 1998.
[RFC2396] Berners-Lee, T., Fielding, R. and L. Masinter,
"Uniform Resource Identifiers (URI): Generic
Syntax", RFC 2396, August 1998.
[RFC2649] Greenblatt, B. and P. Richard, "An LDAP Control
and Schema for Holding Operation Signatures", RFC
2649, August 1999.
[RFC2651] Allen, J. and M. Mealling, "The Architecture of
the Common Indexing Protocol (CIP)", RFC 2651,
August 1999.
[RFC2798] Smith, M., "Definition of the inetOrgPerson LDAP
Object Class", RFC 2798, April 2000.
[RFC3280] Housley, R., Polk, T., Ford, W. and D. Solo,
"Internet X.509 Public Key Infrastructure
Certificate and CRL Profile", RFC 3280, April
2002.
[RFC3377] Hodges, J. and RL. Morgan, "Lightweight Directory
Access Protocol (v3): Technical Specification",
RFC 3377, September 2002.
[X.509-2000] ITU, "Information Technology - Open Systems
Interconnection - The Directory: Public-key and
attribute certificate frameworks", ITU-T
Recommendation X.509, March 2000.
[certinfo-schema] Greenblatt, B., "LDAP Object Class for Holding
Certificate Information", Internet Draft (work in
progress), Februar 2000, <http://
www.watersprings.org/pub/id/draft-greenblatt-
ldap-certinfo-schema-02.txt>.
[componentmatch] Legg, S., "LDAP & X.500 Component Matching
Rules", Internet Draft (work in progress),
October 2002, <draft-legg-ldapext-component-
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matching-09.txt>.
[matchedval] Chadwick, D. and S. Mullan, "Returning Matched
Values with LDAPv3", Internet Draft (work in
progress), June 2002, <draft-ietf-ldapext-
matchedval-06.txt>.
[pkix-ldap-schema] Chadwick, D. and S. Legg, "Internet X.509 Public
Key Infrastructure - LDAP Schema and Syntaxes for
PKIs", Internet Draft (work in progress), June
2002, <draft-ietf-pkix-ldap-pki-schema-00.txt>.
Authors' Addresses
Peter Gietz
DAASI International GmbH
Wilhelmstr. 106
Tuebingen 72074
DE
Phone: +49 7071 29 70336
EMail: peter.gietz@daasi.de
URI: http://www.daasi.de/
Norbert Klasen
Avinci
Halskestr. 38
Ratingen 40880
DE
EMail: norbert.klasen@daasi.de
Appendix A. Sample directory entries
A sample x509certificate directory entry for an intermediate CA
certificate in LDIF format:
dn: x509serialNumber=4903272,EMAILADDRESS=certify@pca.dfn.de,CN=DFN T
oplevel Certification Authority,OU=DFN-PCA,OU=DFN-CERT GmbH,O=Deutsc
hes Forschungsnetz,C=DE
objectclass: x509certificate
x509version: 2
x509serialNumber: 4903272
x509issuer: EMAILADDRESS=certify@pca.dfn.de,CN=DFN Toplevel Certifica
tion Authority,OU=DFN-PCA,OU=DFN-CERT GmbH,O=Deutsches Forschungsnet
z,C=DE
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x509validityNotBefore: 20020110170112Z
x509validityNotAfter: 20060110170112Z
x509subject: EMAILADDRESS=ca@daasi.de,OU=DAASI CA,O=DAASI Internation
al GmbH,C=DE
x509subjectPublicKeyInfoAlgorithm: 1.2.840.113549.1.1.1
x509basicConstraintsCa: TRUE
x509keyUsage: keyCertSign
x509keyUsage: cRLSign
x509subjectKeyIdentifier:: 5nrZFpVK4RKfIglqQ4N4JXBS4Bk=
x509cLRdistributionPointURI: http://www.dfn-pca.de/certification/x509
/g1/data/crls/root-ca-crl.crx
x509cLRdistributionPointURI: http://www.dfn-pca.de/certification/x509
/g1/data/crls/root-ca-crl.crl
x509policyInformationIdentifier: 1.3.6.1.4.1.11418.300.1.1
mail: ca@daasi.de
objectClass: pkiCa
caCertificate:: MIIHTTCCBjWgAwIBAgIDStFoMA0GCSqGSIb3DQEBBQUAMI
GsMQswCQYDVQQGEwJERTEhMB8GA1UEChMYRGV1dHNjaGVzIEZvcnNjaHVuZ3NuZXR6MR
YwFAYD VQQLEw1ERk4tQ0VSVCBHbWJIMRAwDgYDVQQLEwdERk4tUENBMS0wKwYDVQQDE
yRERk4gVG9 wbGV2ZWwgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkxITAfBgkqhkiG9w0B
CQEWEmNlcnRpZnlAcGNhLmRmbi5kZTAeFw0wMjAxMTAxNzAxMTJaFw0wNjAxMTAxNzAx
MTJaMF8xCzAJBgNVBAYTAkRFMSEwHwYDVQQKExhEQUFTSSBJbnRlcm5hdGlvbmFsIEdt
YkgxETAPBgNVBAsTCERB QVNJIENBMRowGAYJKoZIhvcNAQkBFgtjYUBkYWFzaS5kZTC
CASIwDQYJKoZIhvcNAQEBBQA DggEPADCCAQoCggEBAKmQBp+Gr28/qlEWjnJoiH3Awm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OCAQEAU9GmwCW6LwsyHfC241afldqj/GULv8mfSkUEpK2OtYU1JAYFzmQx69iweOKHbg
XZKZA2Wox+9AydIe98MJCSCOFKYjkzgXU4fEZbEgnZBo+/1+W2BoB6gFAWy77KVHgimA
7AqCcfbObeyCmyfLg1ro8/KpE01OjNr0S+EfZ3gX9sezjVkCy12HBNQknz/hT2af25UU
hyFTcvUY4xvlKAQpla29qyO28sfO93Qhkum6SU2XPlsKU+3lyqF33Xy84Y2z8ScVlsMu
VWbUGtmVshnpT5K91n42pu/f0rLtkZDssEDbcLnQDLWEz1aUDkLC++4CeFJxC/Dd/SOr
E0yR0hNQ=
A sample x509certificate directory entry for an end identity
certificate in LDIF format:
dn: x509serialNumber=1581631808272310054353257112721713,EMAILADDRESS=
certificate@trustcenter.de,OU=TC TrustCenter Class 1 CA,O=TC TrustCe
nter for Security in Data Networks GmbH,L=Hamburg,ST=Hamburg,C=DE
objectclass: x509certificate
x509version: 2
x509serialNumber: 1581631808272310054353257112721713
x509issuer: EMAILADDRESS=certificate@trustcenter.de,OU=TC TrustCente
r Class 1 CA,O=TC TrustCenter for Security in Data Networks GmbH,L=
Hamburg, ST=Hamburg,C=DE
x509validityNotBefore: 20011030180757Z
x509validityNotAfter: 20021030180757Z
x509subject: EMAILADDRESS=norbert.klasen@daasi.de,CN=Norbert Klasen,C
=DE
x509subjectPublicKeyInfoAlgorithm: 1.2.840.113549.1.1.1
mail: norbert.klasen@daasi.de
objectClass: pkiUser
userCertificate:: MIIDOTCCAqKgAwIBAgIOTfsAAAACxOstmlOu2TEwDQYJ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Appendix B. Sample searches
This section details how clients should access the certstore. The
searches are presented in LDAP URL format.
Retrieve all certificates for an end entity from a certstore using
the first DIT structure:
ldap:///CN=Norbert%20Klasen,O=DAASI%20International%20GmbH,C=de?
userCertificate?one?(objectClass=x509certificate)
Find a certificate in a trustcenter's certstore suitable for sending
an encrypted S/MIME message to "norbert.klasen@daasi.de"
ldap:///O=TC%20TrustCenter%20for%20Security%20in%20Data%20Networks
%20GmbH,L=Hamburg,ST=Hamburg,C=de?userCertificate?sub?
(&(objectClass=x509certificate)(mail=norbert.klasen@daasi.de)
(|(x509keyUsage=keyEncipherment)(x509keyUsage=keyAgreement)
(x509extendedKeyUsage=1.3.6.1.5.5.7.3.4)))
Find a CA certificate by its "subjectKeyIdentifier" obtained from the
"keyIdentifier" field of the "autorityKeyIdentifier" extension in an
end entity certificate:
ldap:///?caCertificate?sub?
(&(objectClass=x509certificate)(x509subjectKeyIdentifier=%5CE6
%5C7A%5CD9%5C16%5C95%5C4A%5CE1%5C12%5C9F%5C22%5C09%5C6A%5C43%
5C83%5C78%5C25%5C70%5C52%5CE0%5C19))
Appendix C. Changes from previous Drafts
C.1 Changes in Draft 01
o Included new Attributes x509authorityKeyIdentifier,
x509authorityCertissuer, x509authorityCertSerialNumber,
x509certificateLocation, x509certificateHolder, and new
objectclass x509certificateHolder
o Fixed bug in definition of objectclass x509certificate
o Changed references from RFC 2459 to RFC 3280 and included some
respective language in 3.2.
o Changed references from RFC 2251 to RFC 3377 and deleted all
references to LDAPv2.
o Deleted ";binary" in examples
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o Included new section: Comparision with component matching approach
o Some changes in wording and section titles, and elimination of
typos
o Changed order of authors, and one author's address
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