An LDAP/X.500 based distributed PGP Keyserver
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1 An LDAP/X.500 based distributed PGP Keyserver First PGP Keyserver Manager Symposium May 2000, Utrecht Peter Gietz
2 Agenda PKI and Directory X.500 LDAP PGP Keyserver The current PKSD and its problems New concepts Directory based PGP keyserver Standardization process Status Objectclasses
3 PKI and Directory The Burton Group: Network Strategy Report, PKI Architecture, July 1997: (Quoted after: S. Zeber, X.500 Directory Services and PKI issues, Customers should always consider PKI a directoryenabled set of services and infrastructure. Without directory services, PKI will be exponentially harder to implement and manage. Consequently, customers should t deploy PKI widely without an accompanying directory plan D D S
4 Directory as Key Server Requirements Publishing medium for public keys and certificates Gets public keys from user Gets certificates from CA Documents revocation of keys/certificates (CRL) Documents status of a certificate at a specific time
5 What is Directory? X.500 Database standard ISO/ITU v1: 1988, v2: 1993, v3: 1997, v4: 2000 Worldwide distributed data All data accessible worldwide Hierarchical organized data tree Objectoriented design (inheritage of objectclasses) extensible data model - anything goes
6 Directory Information Tree (DIT) D D S C=NL C=SE C=DE O=company O=University cn=mister X DN: c=nl,o=university,cn=mister X
7 LDAP Lightweight Directory Access Protocol Current version: 3 IETF standard (RFC ) Not anymore only access protocol, but a full blown client server system All Directory implementations have LDAP interface (X.500 products, Novell NDS, M$ Active Directory) Lots of client applications have LDAP interface (mail user agents, browser, PGP software)
8 PGP key server First only replication of pubring via Marc Horrowitz Keyserver (PKSD) Started 1995 Own database backend and HTTP interface Operational model (add, revoke, etc.) Net of server Every server has all keys Server synchronisation via
9 PKSD Problems No distributed system: all keys on all server Permanent server synchronisation causes high bandwith usage Chaos when one server is down (bouncing s) No guarantee that a key is replicated on all server Not scalable
10 Problems of the Web of trust Most keys only selfsigned (=islands of trust) The web of trust is only existing for people belonging to certain inner circles Many users don t know what they are signing Even at IETF Key signing parties there is no proof of identity
11 New concepts for PGP key server PKSD with enhanced backend (Open Keyserver from Highware) Keyserver based on DNSSec ( Synchronisation via multicast (G. Baumer, Distributed Server for PGP Keys synchronised by multicast, Keyserver based on LDAP (PGP Certificate Server from NAI)
12 LDAP PGP-Keyserver requirements Standardizes solution data model operational model Keys searchable by different criteria Certification path followable Key status retrievable
13 Process of standardization 1994 Draft from Roland Hedberg 1994 proprietary solution in Tübingen Both models fail to include more than one certificate in a person s entry 1998 new initiative by DANTE DDS and University of Stuttgart take part in the discussion and announce an Internet Draft Roadmap: Draft in Summer 2000
14 Status of LDAP PGP key server D D S PGP test server based on LDAP: ldap://as.directory.dfn.de:11010/l=pgp Keyspace??sub?(cn=*) Policy for a service Definition of a data model for PGP Definition of a format for CAs to send certificates Software for storing and retrieving certificates A user can store his key into the server via WWW formular
15 The Directory Information Tree for PGP D D S
16 A PGP key displayed (1) D D S
17 A PGP key displayed (2) D D S
18 The DFN-PCA key D D S
19 Objectclasses for PGP 1: pgpkeycontainer D D S must contain: pgpkeyentryname (name of the entry); pgpkey (ASCII-armored key) pgpuserid; pgpkeyid; pgpfingerprint pgpkeysize; pgpkeytype may contain: pgpkeycreatetime; pgpkeyexpiretime pgpkeyrevoked (0=valid, 1=revoked) pgpkeyusage pgpuserdn (DN of the directory entry of the person)
20 Objectclasses for PGP 2: cainformationobject D D S must contain: cacertkeylink / cacertkeyurl (DN / URL of the certifying key) cadn / caurl (DN / URL of the CA, or RA) capolicy (URL of the CA s policy) cacrldn / cacrlurl (DN / URL of the CA s CRL)
21 Objectclasses for PGP 3: pgpserverinfo D D S must contain: cn (name of the entry, always cn=pgpserverinfo) basekeyspacedn (DN of the PGP keyspace subtree) may contain: basependingdn (DN of the keyspace for yet pending keys)
22 Current problems PGP ServerInfo entry has to be directly underneath the root Current model is not similar to the X.509 Key storage model Will S/MIME win the race?
23 Addresses and Partners DFN Directory Services DFN PCA University of Stuttgart CA
24 X.509: The classic (1988) The Directory: Authentication Framework Part of the OSI-Directory standard X.500 Defines Data model, e.g.: usercertificate; cacertificate crosscertificatepair certificaterevocationlist Defines mechanisms for authentification Certificate includes DN of the user Certificate includes DN of the signing CA
25 X.509v3 (1997) New extension mechanism Predefined extensions: Information about key: identifier, usage,... Policy information: certificate policy,... User and CA extensions: alternative name,... Certification path constraints Lots of people see X.509v3 as independent from X.500 Problem: hypothetical DNs No proof of uniqueness
26 X.509v4 (2000) Draft version ready (May 11, 2000) ftp://ftp.bull.com/pub/osidirectory/ 4thEditionTexts/X.509_4thEditionDraftV2.pdf Press release: sg7_x509_press.htm Includes verification of certificate chains with CAs from different domains and hierarchies Enhancements in the area of certificate revocation New features in attribute certificates (AC) Defines usage of ACs for access control and authorization
27 Applications of X.509 certificates D D S Certificate based security on different levels: Network Layer: IPSec (Internet Protocol Security) Transport Layer: SSL (Secure Socket Layer) = TLS (Transport Layer Security) Application Level: S/MIME (Secure Multipurpose Internet Mail Extensions) v3: patent free algorithms, mailing list support PGP (Pretty Good Privacy), since version 6
28 IETF WG PKIX Defines an Internet PKI on basis of X.509 certificates Supports the following IETF security protocols: S/MIME TLS (=SSL) IPSec Status: 9 RFCs 21 Internet Drafts Overview: <draft-ietf-pkix-roadmap-05.txt>
29 PKIX and certificate profiles D D S RFC 2459 redrafted: <draft-ietf-pkix-new-part1-00.txt> defines: Certificate (X.509v3 standard fields and standard extensions plus one private extension for authority information access, for e.g. validation service) CRL (X.509v2 standard fields, and standard extensions) Certificate path validation process, basic and extending <draft-ietf-pkix-acx509prof-02.txt> defines: Attribute certificate profile for standard fields and extensions additional attribute types Attribute certificate validation revocation
30 PKIX and certificate profiles (contd.) <draft-ietf-pkix-qc-03.txt> defines: Qualified Certificate as prescribed by some governmental laws owner is natural person unmistakable identity only non-repudiation as key usage...
31 PKIX LDAPv2 schema RFC 2587 Internet X.509 Public Key Infrastructure LDAPv2 Schema, defines: Objectclass pkiuser with attribute usercertificate Objectclass pkica with attributes cacertificate, certificaterevocationlist, authorityrevocationlist, crosscertificatepair Objectclass crldistributionpoint with attributes cn, certificaterevocationlist, authorityrevocationlist, deltarevocationlist Objectclass deltacrl with attribute deltarevocationlist
32 PKIX operational protocols LDAPv2: RFC 2559 defines: LDAP repository read LDAP repository search LDAPv3: <draft-ietf-pkix-ldap-v3-01.txt> defines: Which v3 features are needed in PKIX attributecertificate certificate matching rules FTP/HTTP: RFC 2585 Limited Attribute Certificate Acquisition Protocol (LAAP) <draft-ietf-pkix-laap-00.txt>
33 PKIX and certificate validation Simple Certification Verification Protocol (SCVP) <draft-ietf-pkix-scvp-01.txt> Client can offload certificate validation to a dedicated (trusted) server (validity of certificate and certification path) Online Certificate Status Protocol (OCSP) RFC 2560 determination of current status of a certificate without the use of CRLs question contains cert id and time answer contains: revoked, notrevoked or unknown OCSP Extension <draft-ietf-pkix-ocspx-00.txt> allows client to delegate processing of certificate acceptance functions to a trusted server
34 LDAP work on X.509: Data model LDAP Object Class for Holding Certificate Information <draft-greenblatt-ldap-certinfo-schema-02.txt> Introduces Objectclass certificatetype enables client to retrieve only those certificates that it really wants contains attributes: typename, serialnumber, issuer, validitynotbefore, validitynotafter, subject, subjectpublickeyinfo, certificateextension, otherinfo
35 LDAP work on X.509: TLS LDAPv3 Extension for Transport Layer Security <draft-ietf-ldapext-ldapv3-tls-06.txt> Extended request/response for Start TLS operation Authentication Methods <draft-ietf-ldapext-authmeth-04.txt> Includes (as SHOULD) certificate-based authentication with TLS Client uses Start TLS operation Server requests client certificate Client sends certificate and performs a private key based encryption Client and server negotiate ciphersuite with encryption algorithm Server checks validity of certificate and its CA Client binds with SASL EXTERNAL mechanism
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