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X.500 Part 1

X.500 Part 1. CNS 4650 Fall 2004 Rev. 2. Introduction to X.500. X.500 is basis for most modern directory services (LDAP, NDS, Active Directory) X.500 is actually a collection of standards X.500 was initially created to be a international “white pages” ITU standard. X.500 Standards.

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X.500 Part 1

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  1. X.500 Part 1 CNS 4650 Fall 2004 Rev. 2

  2. Introduction to X.500 • X.500 is basis for most modern directory services (LDAP, NDS, Active Directory) • X.500 is actually a collection of standards • X.500 was initially created to be a international “white pages” • ITU standard

  3. X.500 Standards

  4. X.500 Terminology

  5. Agents • Two types of Agents • User • Service/System/Server • Common to most modern directories

  6. User Agent (DUA) • Creates queries • Directory is viewed a single unit • Abstract the directory from the user • NOT the UI or design

  7. System Agent (DSA) • System/Server/Service • Not a single component • Collection of services for fulfilling DUA’s requests • Access to the “system” • OSI Application layer process

  8. X.500 Protocols • Operate in the Application Layer of OSI • Define Client and Server protocols • Only one defined for clients

  9. Directory Access Protocol (DAP) • Defines the “language” between the client (DUA) and the server (DSA) • Defines read, search, modify operations • Defines the association between DSA and DUA • The only protocol used by DUAs

  10. Directory System Protocol (DSP) • Defines how DSAs talk to other DSAs • Referrals and Chaining • Caching of queries

  11. Directory Operational Binding Management Protocol (DOP) • Defines how DSAs establish connections between one another (for DISP) • Define who knows what and who is master of what

  12. Directory Information Shadowing Protocol (DISP) • Transfer data/updates between shadowing DSAs • Protocols from X.400 used for actual transfer protocol

  13. DUA, DSA and X.500 Protocols

  14. Other Standards • Association Control Service Element (ACSE) • Remote Operation Service Element (ROSE) • Abstract Syntax Notation One (ASN.1)

  15. APIs • XDS • LDAP C API

  16. Sources • Radicati S. (1994) X.500 Directory Serivces: Technology and Deployment New York: Van Nostrand Reinhold

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