Network Working Group P. Gietz Internet-Draft DAASI International GmbH Expires: December 29, 2003 N. Klasen Avinci June 30, 2003 An LDAPv3 Schema for X.509 Certificates draft-klasen-ldap-x509certificate-schema-03 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- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http:// www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. Comments and suggestions on this document are encouraged. They should be sent to the PKIX working group discussion list or directly to the authors. This Internet-Draft will expire on December 29, 2003. Copyright Notice Copyright (C) The Internet Society (2003). All Rights Reserved. Please see the full copyright statement near the end of this document for more information Abstract This document describes an LDAP schema which can be used to implement a certificate store for X.509 certificates. Specifically, two structural object classes for X.509 user and CA certificates are defined. Key fields of a certificate are stored in LDAP attributes Gietz & Klasen Expires December 29, 2003 [Page 1] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 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 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. Gietz & Klasen Expires December 29, 2003 [Page 2] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . 6 2. Comparison with Values Return Filter Control . . . . . . . 7 3. Comparison with component matching approach . . . . . . . 8 4. The x509certificate object classes and their attribute types . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.1 Attributes for mandatory fields of an X.509 certificate . 8 4.1.1 X.509 version . . . . . . . . . . . . . . . . . . . . . . 8 4.1.2 Serial number . . . . . . . . . . . . . . . . . . . . . . 8 4.1.3 Signature algorithm . . . . . . . . . . . . . . . . . . . 9 4.1.4 Issuer . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.1.5 Validity . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.1.6 Subject . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.1.7 Subject public key info algorithm . . . . . . . . . . . . 10 4.2 Attributes for selected extensions . . . . . . . . . . . . 11 4.2.1 Authority key identifier extension . . . . . . . . . . . . 11 4.2.1.1 Authority key identifier . . . . . . . . . . . . . . . . . 12 4.2.1.2 Authority cert issuer . . . . . . . . . . . . . . . . . . 12 4.2.1.3 Authority cert serial number . . . . . . . . . . . . . . . 12 4.2.2 Subject key identifier extension . . . . . . . . . . . . . 12 4.2.3 Key usage extension . . . . . . . . . . . . . . . . . . . 13 4.2.4 Policy information identifier extension . . . . . . . . . 13 4.2.5 Subject alternative name extension . . . . . . . . . . . . 13 4.2.5.1 Subject RFC822 name . . . . . . . . . . . . . . . . . . . 14 4.2.5.2 Subject DNS name . . . . . . . . . . . . . . . . . . . . . 14 4.2.5.3 Subject directory name . . . . . . . . . . . . . . . . . . 14 4.2.5.4 Subject Uniform Resource Identifier . . . . . . . . . . . 15 4.2.5.5 Subject IP address . . . . . . . . . . . . . . . . . . . . 15 4.2.5.6 Subject registered ID . . . . . . . . . . . . . . . . . . 15 4.2.6 Issuer alternative name extension . . . . . . . . . . . . 15 4.2.6.1 Issuer RFC 822 name . . . . . . . . . . . . . . . . . . . 16 4.2.6.2 Issuer DNS name . . . . . . . . . . . . . . . . . . . . . 16 4.2.6.3 Issuer directory name . . . . . . . . . . . . . . . . . . 16 4.2.6.4 Issuer Uniform Resource Identifier . . . . . . . . . . . . 17 4.2.6.5 Issuer IP address . . . . . . . . . . . . . . . . . . . . 17 4.2.6.6 Issuer registered ID . . . . . . . . . . . . . . . . . . . 17 4.2.7 Basic constraints extension . . . . . . . . . . . . . . . 17 4.2.8 Extended key usage extension . . . . . . . . . . . . . . . 18 4.2.9 CRL distribution points extension . . . . . . . . . . . . 18 4.3 Additional attributes . . . . . . . . . . . . . . . . . . 19 4.3.1 Certificate location . . . . . . . . . . . . . . . . . . . 19 4.3.2 Certificate holder . . . . . . . . . . . . . . . . . . . . 19 4.3.3 X.509 user certificate . . . . . . . . . . . . . . . . . . 19 4.3.4 X.509 CA certificate . . . . . . . . . . . . . . . . . . . 19 4.4 X.509 PKC object class . . . . . . . . . . . . . . . . . . 20 4.5 X.509 user certificate object class . . . . . . . . . . . 20 4.6 X.509 CA certificate object class . . . . . . . . . . . . 21 Gietz & Klasen Expires December 29, 2003 [Page 3] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 4.7 X.509 certificate holder object class . . . . . . . . . . 21 5. DIT structure and naming . . . . . . . . . . . . . . . . . 21 6. Security Considerations . . . . . . . . . . . . . . . . . 23 7. Open issues . . . . . . . . . . . . . . . . . . . . . . . 23 8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . 24 9. References . . . . . . . . . . . . . . . . . . . . . . . . 24 Normative references . . . . . . . . . . . . . . . . . . . 24 Non-normative references . . . . . . . . . . . . . . . . . 26 Authors' Addresses . . . . . . . . . . . . . . . . . . . . 27 A. Sample directory entries . . . . . . . . . . . . . . . . . 27 B. Sample searches . . . . . . . . . . . . . . . . . . . . . 29 C. Changes from previous Drafts . . . . . . . . . . . . . . . 30 C.1 Changes in Draft 01 . . . . . . . . . . . . . . . . . . . 30 C.2 Changes in Draft 02 . . . . . . . . . . . . . . . . . . . 30 C.3 Changes in Draft 03 . . . . . . . . . . . . . . . . . . . 31 Full Copyright Statement . . . . . . . . . . . . . . . . . 32 Gietz & Klasen Expires December 29, 2003 [Page 4] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 1. Introduction A key component in the wide-spread adoption of a PKI infrastructure is the general availability of public keys 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 to solve this problem by the use of the structural object classes x509userCertificate and x509caCertificate for storing certificates. Each certificate will be stored in a separate entry in the directory. 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 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 and consistency of the information. 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. Each attribute type uses existing LDAP syntax, so that no new matching rules need to be defined. 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 Gietz & Klasen Expires December 29, 2003 [Page 5] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 indexing service based on The Common Indexing Protocol (CIP) [RFC2651], which defines a protocol between index servers for exchanging indexobjects in order to facilitate query routing. The Tagged Index Object format as specified in [RFC2654] was specified to carry directory server information, by collecting the single attributetypes and values. This document is one of a set following this approach comprising: 1. the LDAP schema for X.509 public key certificates (this document) 2. the LDAP schema for X.509 attribute certificates [ldap-ac-schema] 3. the LDAP schema for X.509 CRLs [ldap-crl-schema] 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. 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 leverage their indexing support for standard LDAPv3 syntaxes. A CIP-based indexing system for a wide scale distributed certificate repository will rather be possible by using the solution proposed Gietz & Klasen Expires December 29, 2003 [Page 6] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 here due to its dependency on attribute values. 3. Comparison 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 until 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 useful 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 classes and their attribute types The description of all attributes with relevance to fields and extensions of an X.509 certificate include a respective reference to [X.509-2000] and to [RFC3280]. 4.1 Attributes for mandatory fields of an X.509 certificate 4.1.1 X.509 version X.509 Version of the encoded certificate (See X.509(2000) 7, RFC3280 4.1.2.1.) or of the CRL. ( 1.3.6.1.4.1.10126.1.5.3.1 NAME 'x509version' DESC 'X.509 Version of the certificate, or of the CRL' EQUALITY integerMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE ) Values of this attribute may either be 0, 1, 2 or 3 corresponding to X.509 v1, v2, v3, or v4. 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). See X.509(2000) 7, RFC3280 4.1.2.2 Gietz & Klasen Expires December 29, 2003 [Page 7] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 ( 1.3.6.1.4.1.10126.1.5.3.2 NAME 'x509serialNumber' DESC 'Unique integer for each certificate issued by a particular CA' EQUALITY integerMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 ) 4.1.3 Signature algorithm OID identifying the algorithm used by the CA in signing the certificate (see X.509(2000) 7, RFC3280 4.1.2.3) or the CRL. ( 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 CRL or the certificate' EQUALITY objectIdentifierMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.38 SINGLE-VALUE ) 4.1.4 Issuer String representation of the issuer's distinguished name (see X.509(2000) 7, RFC3280 4.1.2.4) ( 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' 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 (see X.509(2000) 7, RFC3280 4.1.2.5) 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 separate attributes "x509validityNotBefore" and "x509validityNotAfter". The times are represented in string form as defined in [RFC2252]. Gietz & Klasen Expires December 29, 2003 [Page 8] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 ( 1.3.6.1.4.1.10126.1.5.3.5 NAME 'x509validityNotBefore' DESC 'Date on which the certificate validity period begins' 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' EQUALITY generalizedTimeMatch ORDERING generalizedTimeOrderingMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.24 SINGLE-VALUE ) Note that the field in the certificate may be in UTC or GeneralizedTime format. If in UTC format, the creator of this attribute MUST convert the UTC time into GeneralisedTime format when creating the attribute value. 4.1.6 Subject String representation of the subject's distinguished name (see X.509(2000) 7, RFC3280 4.1.2.6). ( 1.3.6.1.4.1.10126.1.5.3.7 NAME 'x509subject' DESC 'Distinguished name of the entity associated with this public-key' 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 identifying the algorithm associated with the certified public key (see X.509(2000) 7, RFC3280 4.1.2.7). Gietz & Klasen Expires December 29, 2003 [Page 9] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 ( 1.3.6.1.4.1.10126.1.5.3.8 NAME 'x509subjectPublicKeyInfoAlgorithm' DESC 'OID identifying the algorithm associated with the certified public key' 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 basic constraints extension o name constraints extensions o policy constraints extensions o inhibit any policy extension o freshest CRL extension 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 or CRL (see X.509(2000) 8.2.2.1, RFC3280 4.2.1.1). 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. Gietz & Klasen Expires December 29, 2003 [Page 10] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 4.2.1.1 Authority key identifier ( 1.3.6.1.4.1.10126.1.5.3.11 NAME 'x509authorityKeyIdentifier' DESC 'Key Identifier field of the Authority Key Identifier extension' 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 'Authority Cert Issuer field of the Authority Key Identifier extension' 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. 4.2.1.3 Authority cert serial number ( 1.3.6.1.4.1.10126.1.5.3.13 NAME 'x509authorityCertSerialNumber' DESC 'Authority Cert Serial Number field of the Authority Key Identifier extension' 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 (see X.509(2000) 8.2.2.2, RFC3280 4.2.1.2). 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' EQUALITY octetStringMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.40 SINGLE-VALUE ) Gietz & Klasen Expires December 29, 2003 [Page 11] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 4.2.3 Key usage extension This attribute defines the purpose (e.g., encipherment, signature, certificate signing) of the key contained in the certificate (see X.509(2000) 8.2.2.3, RFC3280 4.2.1.3). ( 1.3.6.1.4.1.10126.1.5.3.15 NAME 'x509keyUsage' DESC 'Purpose for which the certified public key is used' 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" 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 (see X.509(2000) 8.2.2.6, RFC3280 4.2.1.5). ( 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' 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 (see X.509(2000) 8.3.2.1, RFC3280 4.2.1.7). Separate attribute types are defined for all choices of the ASN.1 type "GeneralName" except for "otherName", "x400Address" and "ediPartyName". Gietz & Klasen Expires December 29, 2003 [Page 12] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 4.2.5.1 Subject RFC822 name ( 1.3.6.1.4.1.10126.1.5.3.17 NAME 'x509subjectRfc822Name' DESC 'Internet electronic mail address of the entity associated with this public-key' EQUALITY caseIgnoreIA5Match SUBSTR caseIgnoreIA5SubstringsMatch 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]. 4.2.5.2 Subject DNS name ( 1.3.6.1.4.1.10126.1.5.3.18 NAME 'x509subjectDnsName' DESC 'Internet domain name of the entity associated with this public-key' EQUALITY caseIgnoreIA5Match SUBSTR caseIgnoreIA5SubstringsMatch 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 'x509subjectDirectoryName' DESC 'Distinguished name of the entity associated with this public-key' 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]. Gietz & Klasen Expires December 29, 2003 [Page 13] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 4.2.5.4 Subject Uniform Resource Identifier ( 1.3.6.1.4.1.10126.1.5.3.20 NAME 'x509subjectUniformResourceIdentifier' DESC 'Uniform Resource Identifier for the World-Wide Web of the entity associated with this public-key' EQUALITY caseExactIA5Match SUBSTR caseExactIA5SubstringsMatch 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]. 4.2.5.5 Subject IP address ( 1.3.6.1.4.1.10126.1.5.3.21 NAME 'x509subjectIpAddress' DESC 'Internet Protocol address of the entity associated with this public-key' EQUALITY caseIgnoreIA5Match SUBSTR caseIgnoreIA5SubstringsMatch 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 'x509subjectRegisteredID' DESC 'OID of any registered object identifying the entity associated with this public-key' 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 Issuer alternative name extension The issuer alternative names extension allows additional identities to be bound to the subject of the certificate or CRL (see X.509(2000) 8.3.2.2, RFC3280 4.2.1.8). Separate attribute types are defined for all choices of the ASN.1 type "GeneralName" except for "otherName", "x400Address" and "ediPartyName". Gietz & Klasen Expires December 29, 2003 [Page 14] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 4.2.6.1 Issuer RFC 822 name ( 1.3.6.1.4.1.10126.1.5.3.23 NAME 'x509issuerRfc822Name' DESC 'Internet electronic mail address of the entity who has signed and issued the certificate' EQUALITY caseIgnoreIA5Match SUBSTR caseIgnoreIA5SubstringsMatch 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]. 4.2.6.2 Issuer DNS name ( 1.3.6.1.4.1.10126.1.5.3.24 NAME 'x509issuerDnsName' DESC 'Internet domain name of the entity who has signed and issued the certificate' EQUALITY caseIgnoreIA5Match SUBSTR caseIgnoreIA5SubstringsMatch 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 'x509issuerDirectoryName' DESC 'Distinguished name of the entity who has signed and issued the certificate' 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]. Gietz & Klasen Expires December 29, 2003 [Page 15] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 4.2.6.4 Issuer Uniform Resource Identifier ( 1.3.6.1.4.1.10126.1.5.3.26 NAME 'x509issuerUniformResourceIdentifier' DESC 'Uniform Resource Identifier for the World-Wide Web of the entity who has signed and issued the certificate' EQUALITY caseExactIA5Match SUBSTR caseExactIA5SubstringsMatch 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]. 4.2.6.5 Issuer IP address ( 1.3.6.1.4.1.10126.1.5.3.27 NAME 'x509issuerIpAddress' DESC 'Internet Protocol address of the entity who has signed and issued the certificate' EQUALITY caseIgnoreIA5Match SUBSTR caseIgnoreIA5SubstringsMatch 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 'x509issuerRegisteredID' DESC 'OID of any registered object identifying the entity who has signed and issued the certificate' 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 Basic constraints extension This attribute indicates whether the subject of the certificate is a CA (see X.509(2000) 8.4.2.1, RFC3280 4.2.1.10). If the value of this attribute is "TRUE", the certificate MUST be stored in the "cacertificate" attribute. Gietz & Klasen Expires December 29, 2003 [Page 16] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 ( 1.3.6.1.4.1.10126.1.5.3.29 NAME 'x509basicConstraintsCa' DESC 'Identifies whether the subject of the certificate is a CA' EQUALITY booleanMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.7 SINGLE-VALUE ) 4.2.8 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 (see X.509(2000) 8.2.2.4, RFC3280 4.2.1.13). 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 an OID' EQUALITY objectIdentifierMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.38 ) 4.2.9 CRL distribution points extension This attribute identifies how the full CRL information for this certifacte can be obtained (see X.509(2000) 8.6.2.1, RFC3280 4.2.1.14). ( 1.3.6.1.4.1.10126.1.5.3.32 NAME 'x509fullCRLDistributionPointURI' DESC 'URI type of DistributionPointName for the full CRL' EQUALITY caseExactIA5Match 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]. Gietz & Klasen Expires December 29, 2003 [Page 17] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 4.3 Additional attributes 4.3.1 Certificate location This attribute contains a pointer to the directory entry of a certificate. Thus it is possible to point to the certificate from an, e.g., white pages entry. ( 1.3.6.1.4.1.10126.1.5.4.74 NAME 'x509certLocation' 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. ( 1.3.6.1.4.1.10126.1.5.4.75 NAME 'x509certHolder' 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 X.509 user certificate This attribute is used to store the complete certificate. Since it has to be single valued the multi valued attribute userCertificate [pkix-ldap-schema] cannot be used. ( 1.3.6.1.4.1.10126.1.5.4.76 NAME 'x509userCert' DESC 'Complete x.509 user certificate' SUP userCertificate SINGLE-VALUE ) 4.3.4 X.509 CA certificate This attribute is used to store the complete CA certificate. Since it has to be single valued the multi valued attribute caCertificate [pkix-ldap-schema] cannot be used. Gietz & Klasen Expires December 29, 2003 [Page 18] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 ( 1.3.6.1.4.1.10126.1.5.4.77 NAME 'x509caCert' DESC 'Complete x.509 CA certificate' SUP caCertificate SINGLE-VALUE ) 4.4 X.509 PKC object class This abstract object class contains the fields of an X.509 user certificate or CA certificate that are used in searches as attributes and in name forms. It is derived from the abstract objectclass x.509base as specified in [ldap-crl-schema] and is base for the two following object classes. ( 1.3.6.1.4.1.10126.1.5.4.2.3 NAME 'x509PKC' SUP x509base ABSTRACT MUST ( x509serialNumber $ x509validityNotBefore $ x509validityNotAfter $ x509subjectPublicKeyInfoAlgorithm ) MAY ( x509authorityKeyIdentifier $ x509authorityCertIssuer $ x509authorityCertSerialNumber $ x509subjectKeyIdentifier $ x509keyUsage $ x509policyInformationIdentifier $ x509subjectRfc822Name $ x509subjectDnsName $ x509subjectDirectoryName $ x509subjectUniformResourceIdentifier $ x509subjectIpAddress $ x509subjectRegisteredID $ x509issuerRfc822Name $ x509issuerDnsName $ x509issuerDirectoryName $ x509issuerUniformResourceIdentifier $ x509issuerIpAddress $ x509issuerRegisteredID $ x509extKeyUsage $ x509FullcRLDistributionPointURI $ x509certHolder $ x509issuerSerial $ x509basicConstraintsCa ) ) The attribute description of x509issuerSerial can be found in [ldap- ac-schema] 4.5 X.509 user certificate object class This object class is for storing user certificates. Gietz & Klasen Expires December 29, 2003 [Page 19] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 ( 1.3.6.1.4.1.10126.1.5.4.2.4 NAME 'x509userCertificate' SUP x509PKC STRUCTURAL MUST x509userCert MAY x509subject ) The attribute type x509subject is specified here as a MAY attribute. Nevertheless if this attribute is not used at least one of the following attributes MUST be filled in: x509subjectRfc822Name, x509subjectDnsName, x509subjectDirectoryName, x509subjectUniformResourceIdentifier, x509subjectIpAddress, or x509subjectRegisteredID. 4.6 X.509 CA certificate object class This object class is for storing CA certificates. ( 1.3.6.1.4.1.10126.1.5.4.2.5 NAME 'x509caCertificate' SUP x509PKC STRUCTURAL MUST ( x509caCert $ x509subject ) ) 4.7 X.509 certificate holder object class This auxiliary object class has an attribute that contains a pointer to 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 ( x509certLocation ) ) 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 two name forms: Gietz & Klasen Expires December 29, 2003 [Page 20] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 ( 1.3.6.1.4.1.10126.1.5.5.6 NAME "x509userCertificateNameform" OC x509userCeriticate MUST ( x509serialNumber $ x509issuer ) ) ( 1.3.6.1.4.1.10126.1.5.5.7 NAME "x509caCertificateNameform" OC x509caCertificate MUST ( x509serialNumber $ x509issuer ) ) There are some LDAP implementations that don't support multi-valued RDNs. These can use following alternative two name forms: ( 1.3.6.1.4.1.10126.1.5.5.8 NAME "x509userCertificateAltNameForm" OC x509userCertificate MUST x509issuerSerial ) ( 1.3.6.1.4.1.10126.1.5.5.9 NAME "x509PcaCertificateAltNameForm" OC x509caCertificate MUST x509issuerSerial ) The attribute description of x509issuerSerial can be found in [ldap- ac-schema] For public directories of CAs that, besides the data stored in the certificates, do not hold any additional data about end entities the following 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 two name forms: ( 1.3.6.1.4.1.10126.1.5.5.10 NAME "x509userCertificateSerialNumberNameForm" OC x509userCertificate MUST x509serialNumber ) ( 1.3.6.1.4.1.10126.1.5.5.11 NAME "x509caCertificateSerialNumberNameForm" OC x509caCertificate MUST x509serialNumber ) Care must be taken when encoding DNs that contain an x509issuer attribute. Such a value is a string representation according to Gietz & Klasen Expires December 29, 2003 [Page 21] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 [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: x509serialNumber=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. 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. Open issues There are still a number of todos with respect to this draft. Following work items will be dealt with in the next version of this draft: o Section on IANA considerations o Specification of an auxiliary object class with additional Gietz & Klasen Expires December 29, 2003 [Page 22] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 attributes for storing a Qualified certificates as defined in RFC3039 o Specification of an auxiliary object class with attributes standardized elsewhere (e.g. RFC 2798) for additional certificate search possibilities, e.g. for the attribute mail. o complete alignment with [ldap-ac-schema] and [ldap-crl-schema] 8. Acknowledgments This document borrows from a number of IETF documents, including [certinfo-schema]. The authors wish to thank David Chadwick, Russ Housley, Mikhail Sahalayev, Michael Stroeder, and Kurt Zeilenga for their contributions 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. 9. References Normative 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. Gietz & Klasen Expires December 29, 2003 [Page 23] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 [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. [RFC2256] Wahl, M., "A Summary of the X.500(96) User Schema for use with LDAPv3", RFC 2256, December 1997. [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. [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. [ldap-ac-schema] Chadwick, D. and M. Sahalayev, "Internet X.509 Public Key Infrastructure - LDAP Schema for X.509 Attribute Certificates", Internet Draft (work in progress), June 2003, . [ldap-crl-schema] Chadwick, D. and M. Sahalayev, "Internet X.509 Public Key Infrastructure - LDAP Schema for X.509 CRLs", Internet Draft (work in progress), June 2003, . [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, . Non-normative references [RFC2312] Dusse, S., Hoffman, P., Ramsdell, B. and J. Weinstein, "S/MIME Version 2 Certificate Handling", RFC 2312, March 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. [RFC2654] Hedberg, R., Greenblatt, B., Moats, R. and M. Wahl, "A Tagged Index Object for use in the Common Indexing Protocol", RFC 2654, August 1999. [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 (expired), Februar 2000, . [componentmatch] Legg, S., "LDAP & X.500 Component Matching Rules", Internet Draft (work in progress), October 2002, . [matchedval] Chadwick, D. and S. Mullan, "Returning Matched Values with LDAPv3", Internet Draft (work in progress), June 2002, . Gietz & Klasen Expires December 29, 2003 [Page 25] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 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@avinci.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: x509caCertificate 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 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 Gietz & Klasen Expires December 29, 2003 [Page 26] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 x509policyInformationIdentifier: 1.3.6.1.4.1.11418.300.1.1 x509caCert:: MIIHTTCCBjWgAwIBAgIDStFoMA0GCSqGSIb3DQEBBQUAMI GsMQswCQYDVQQGEwJERTEhMB8GA1UEChMYRGV1dHNjaGVzIEZvcnNjaHVuZ3NuZXR6MR YwFAYD VQQLEw1ERk4tQ0VSVCBHbWJIMRAwDgYDVQQLEwdERk4tUENBMS0wKwYDVQQDE yRERk4gVG9 wbGV2ZWwgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkxITAfBgkqhkiG9w0B CQEWEmNlcnRpZnlAcGNhLmRmbi5kZTAeFw0wMjAxMTAxNzAxMTJaFw0wNjAxMTAxNzAx MTJaMF8xCzAJBgNVBAYTAkRFMSEwHwYDVQQKExhEQUFTSSBJbnRlcm5hdGlvbmFsIEdt YkgxETAPBgNVBAsTCERB QVNJIENBMRowGAYJKoZIhvcNAQkBFgtjYUBkYWFzaS5kZTC CASIwDQYJKoZIhvcNAQEBBQA DggEPADCCAQoCggEBAKmQBp+Gr28/qlEWjnJoiH3Awm hNEYMRWgXMXMMjM3S4mSmXZ8FZfTSPhi5O1zx5nyHecfl01fAO79Kpc6XkOTOl4iKBwu 7+DM6my9Iizp2puhOQ6iuuchAIyJQPR0lfWAvvW+4n7Nf13Js5qFHvXBDqvgt6fud1l8 XZ4nPWBSbs6OnB4EUDlRLx5fdCX2sEPQINKeu0INMtjHI6eGbspmahup0ArPA9RYZVjV q6ZHkh4205/JAhji9KtFifKCztXNTRMba7AHd2uS6GbF9+chGLPWGNZKtMhad1SvU7Zl w/ySHkFbBFZMu6x3kAVgwW8gKQa5qSFnMw/WTKATJRPekCAwEAAaOCA8IwggO+MA8GA1 UdEwEB/wQFMAMBAf8wCwYDVR0PBAQDAgEGMB0GA1UdDgQWBBTmetkWlUrhEp8iCWpDg3 glcFLgGTCB2wYDVR0jBIHTMIHQgBQGC/q1+Eh4oyCxCz7PoNDE0X990KGBsqSBrzCBrD ELMAkGA1UEBhMCREUxITAfBgNVBAoTGERldXRzY2hlcyBGb3JzY2h1bmdzbmV0ejEWMB QGA1UECxMNREZOLUNFUlQgR21iSDEQMA4GA1UECxMHREZOLVBDQTEtMCsGA1UEAxMkRE ZOIFRvcGxldmVsIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFh JjZXJ0aWZ5QHBjYS5kZm4uZGWCAxXP/TCBpQYDVR0fBIGdMIGaMEugSaBHhkVodHRwOi 8vd3d3LmRmbi1wY2EuZGUvY2VydGlmaWNhdGlvbi94NTA5L2cxL2RhdGEvY3Jscy9yb2 90LWNhLWNybC5jcngwS6BJoEeGRWh0dHA6Ly93d3cuZGZuLXBjYS5kZS9jZXJ0aWZpY2 F0aW9uL3g1MDkvZzEvZGF0YS9jcmxzL3Jvb3QtY2EtY3JsLmNybDARBglghkgBhvhCAQ EEBAMCAQYwSwYJYIZIAYb4QgEIBD4WPGh0dHA6Ly93d3cuZGZuLXBjYS5kZS9jZXJ0aW ZpY2F0aW9uL3BvbGljaWVzL3g1MDlwb2xpY3kuaHRtbDCB+QYJYIZIAYb4QgENBIHrFo HoVGhpcyBjZXJ0aWZpY2F0ZSB3YXMgaXNzdWVkIGJ5IHRoZSBERk4tUENBLCB0aGUgVG 9wCkxldmVsIENlcnRpZmljYXRpb24gQXV0aG9yaXR5IG9mIHRoZSBHZXJtYW4gUmVzZW FyY2gKTmV0d29yayAoRGV1dHNjaGVzIEZvcnNjaHVuZ3NuZXR6LCBERk4pLgpUaGUga2 V5IG93bmVyJ3MgaWRlbnRpdHkgd2FzIGF1dGhlbnRpY2F0ZWQgaW4KYWNjb3JkYW5jZS B3aXRoIHRoZSBERk4tUENBIHg1MDkgUG9saWN5LjA3BglghkgBhvhCAQMEKhYoaHR0cH M6Ly93d3cuZGZuLXBjYS5kZS9jZ2kvY2hlY2stcmV2LmNnaTBkBgNVHSAEXTBbMFkGCy sGAQQB2RqCLAEBMEowSAYIKwYBBQUHAgEWPGh0dHA6Ly93d3cuZGZuLXBjYS5kZS9jZX J0aWZpY2F0aW9uL3BvbGljaWVzL3g1MDlwb2xpY3kuaHRtbDANBgkqhkiG9w0BAQUFAA 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: Gietz & Klasen Expires December 29, 2003 [Page 27] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 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: x509userCertificate 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 x509userCert:: MIIDOTCCAqKgAwIBAgIOTfsAAAACxOstmlOu2TEwDQYJ KoZIhvcNAQEEBQAwgbwxCzAJBgNVBAYTAkRFMRAwDgYDVQQIEwdIYW1idXJnMRAwDgYD VQQHEwdIYW1idXJnMTowOAYDVQQKEzFUQyBUcnVzdENlbnRlciBmb3IgU2VjdXJpdHkg aW4gRGF0YSBOZXR3b3JrcyBHbWJIMSIwIAYDVQQLExlUQyBUcnVzdENlbnRlciBDbGFz cyAxIENBMSkwJwYJKoZIhvcNAQkBFhpjZXJ0aWZpY2F0ZUB0cnVzdGNlbnRlci5kZTAe Fw0wMTEwMzAxODA3NTdaFw0wMjEwMzAxODA3NTdaME4xCzAJBgNVBAYTAkRFMRcwFQYD VQQDEw5Ob3JiZXJ0IEtsYXNlbjEmMCQGCSqGSIb3DQEJARYXbm9yYmVydC5rbGFzZW5A ZGFhc2kuZGUwgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAL8+XK98p4YjD7Wq7Apm hAN/j2tfVsFCS0ufy12vGpEtG4ny1tbbBORCJI8vIlDr2/vVTESl6UjzceloVUCib5V8 55mKUVmLL9Ay4qQLFd4wAoRSPAu9DkfbR+ygjzaYq+MUKMwaB61sG6911xk/e2/IIq8/ IHKrRoYQGmHkaaJpAgMBAAGjgaowgacwMwYJYIZIAYb4QgEIBCYWJGh0dHA6Ly93d3cu dHJ1c3RjZW50ZXIuZGUvZ3VpZGVsaW5lczARBglghkgBhvhCAQEEBAMCBaAwXQYJYIZI AYb4QgEDBFAWTmh0dHBzOi8vd3d3LnRydXN0Y2VudGVyLmRlL2NnaS1iaW4vY2hlY2st cmV2LmNnaS80REZCMDAwMDAwMDJDNEVCMkQ5QTUzQUVEOTMxPzANBgkqhkiG9w0BAQQF AAOBgQCrAzuZzLztupeqcHa8OUOcnRuTacMpBEeICbZMKv6mN9rMYkAxFKerj/yXbdCE 8/3X3L00eGj+a8A7PumATiJSfmvYqa4EMZwHC2FFqPxYyAj+xVuSlL5AC4HGHu4SOCp/ UJu1xysoD16chOOLpj7+ZWZWLHIjA3zeXwUGl4kFvw== 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? x509userCert?one?(objectClass=x509userCertificate) Find a certificate in a trustcenter's certstore suitable for sending an encrypted S/MIME message to "norbert.klasen@daasi.de" Gietz & Klasen Expires December 29, 2003 [Page 28] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 ldap:///O=TC%20TrustCenter%20for%20Security%20in%20Data%20Networks %20GmbH,L=Hamburg,ST=Hamburg,C=de?x509userCert?sub? ((&(objectClass=x509userCertificate) (x509subjectRfc822Name=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=x509caCertificate)(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 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 C.2 Changes in Draft 02 o abstract object class x509PKC Gietz & Klasen Expires December 29, 2003 [Page 29] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 o aligned to [ldap-ac-schema] and [ldap-crl-schema] C.3 Changes in Draft 03 o Changed Matching Rules from caseIgnoreMatch to caseIgnoreIA5Match etc. o moved the references to RFC 3280 from the DESC part of the attribute definition to the text o added some additional text about CIP in Introduction o reworded text in Section 4.1.7 o changed x509userCert and x509caCert to be inherited from userCertificate and caCertificate respectively o added clarification about x509subject and subject alternative names in section Section 4.5 o added attribute type x509issuerSerial to x509PKC object class o added attribute type x509basicConstraintsCa to x509PKC object class o renamed attributetype x509cRLDistributionPointURI to x509FullcRLDistributionPointURI o devided references in normative and non normative o deleted attributetype mail from x509PKC objectclass o created separate Name Forms for x509userCertificate and x509caCertificate object classes. o changed attributetype x509SerialNumber to MULTI-VALUE o adjusted examples to new schema o Fixed more typos Gietz & Klasen Expires December 29, 2003 [Page 30] Internet-Draft An LDAPv3 Schema for X.509 Certificates June 2003 Full Copyright Statement Copyright (C) The Internet Society (2003). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS 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. Acknowledgement Funding for the RFC Editor function is currently provided by the Internet Society. Gietz & Klasen Expires December 29, 2003 [Page 31]