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Directories: Raiders of the Stanford Model

Directories: Raiders of the Stanford Model. speeding the journey to directory services v1.0 . . . plus some open questions Keith Hazelton, UW-Madison, Sept. ‘99 http://axle.doit.wisc.edu/~haz. Framework. Defining the task Namespace (briefly) Tree design (the DIT) Schema choices

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Directories: Raiders of the Stanford Model

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  1. Directories:Raiders of the Stanford Model speeding the journey to directory services v1.0 . . . plus some open questions Keith Hazelton, UW-Madison, Sept. ‘99 http://axle.doit.wisc.edu/~haz

  2. Framework • Defining the task • Namespace (briefly) • Tree design (the DIT) • Schema choices • Helping each other I 2 Middleware Early Harvest, Denver

  3. Defining the task • Creating a general purpose enterprise-wide directory service • Timothy A. Howes, et al., Understanding and Deploying LDAP Directory Services (MacMillan Network Architecture and Development Series), Published 1999, ISBN: 1578700701 • Directory Service Schema Design, CSG Workshop, U VA, Bob Morgan, U. Wash., chair, May, 1999 http://www.stonesoup.org/Meetings.past/9905/ schema.pres/ I 2 Middleware Early Harvest, Denver

  4. Namespace (briefly) • Unique identifiers • RDN based on 16-byte UUID (as 36-byte string) • Globally unique, visible, but not people friendly • Publically visible identifier (PVI) “DR232E433” • Institutionally unique, visible, people friendly • And way down there: Primary key for entries • invisible, immutable, not an LDAP attribute I 2 Middleware Early Harvest, Denver

  5. Tree design (the DIT) • f ... l ... a ... t • DN: uuid=123…, ou=people, dc=wisc, dc=edu • Why? DN changes rare; no need to prune/graft • Issue: Challenges for replication • Issue: No org-chart reflection in TREE, so no tree-based admin • Org, group info carried in person’s attributes • A scale issue--LAN vs the internet I 2 Middleware Early Harvest, Denver

  6. Schema choices • InetOrgPerson as parent object class • core attrs., contact info • Intermediate parents? LIPS? CICPerson? • Interoperability benefits of shared parents • Define wisc-edu-Person to hold our institution-specific attributes • other sys identifiers, authorization attrs., group attrs. I 2 Middleware Early Harvest, Denver

  7. Schema choices • Principle: Never repurpose an existing attribute. Adhere to its X.500 / RFC definition • Principle: A derived class’s attributes are a superset of its parent class’s attributes • Issue: How do we represent relations (e.g. one person to multiple appointments] • Issue: set of all constraints on schema design => the solution space is null set? I 2 Middleware Early Harvest, Denver

  8. Helping each other • Roadmaps should show alternate routes • a) COTS metadirectory + directory server • b) registry (RDBMS) + directory server • Interoperable schema • have to settle on purposes, uses first • How about the access to web page idea from dinner last night? • process??? I 2 Middleware Early Harvest, Denver

  9. Helping each other • Finding and joining clusters of clue • CIC, CSG, . . . • Network Application Consortium (netapps.org} • The Burton Group (tbg.com) • PKI readiness • UCOP/Columbia -- JSTOR/OCLC DLF “readiness” • ??????? I 2 Middleware Early Harvest, Denver

  10. Helping each other • UW-Madison UDS: www.bascom.wisc.edu “special topics” • axle.doit.wisc.edu/~haz • ??????? I 2 Middleware Early Harvest, Denver

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