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LDAP Client Update Protocol (LCUP)

LDAP Client Update Protocol (LCUP). Olga Natkovich Sun-Netscape Alliance olga@netscape.com. Introduction. LCUP is intended to synchronize LDAP clients with content stored by LDAP servers. Problem areas address mobile clients that maintain local data cache meta directory applications

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LDAP Client Update Protocol (LCUP)

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  1. LDAP Client Update Protocol(LCUP) Olga Natkovich Sun-Netscape Alliance olga@netscape.com

  2. Introduction • LCUP is intended to synchronize LDAP clients with content stored by LDAP servers. • Problem areas address • mobile clients that maintain local data cache • meta directory applications • event triggers • Problem areas not addressed • server to server synchronization (addressed by LDUP) • LCUP combines features of DirSync, Persistent search and Triggered search

  3. Protocol Characteristics • Supports one way synchronization only. • Server does not maintain any state information on behalf of the clients. Clients maintain the state information passed to them by the server in a cookie. • No predefined agreements. Clients decide when and from which server to get the changes. • Clients always initiate synchronization sessions. • Clients always pull the data from a server.

  4. Protocol Elements • clientUpdateControlValue ::= SEQUENCE{ cookie OCTET STRING OPTIONAL keepConnection BOOLEAN DEFAULT FALSE changesOnly BOOLEAN DEFAULT FALSE} • entryUpdateControlValue ::= SEQUENCE{ cookie OCTET STRING OPTIONAL stateUpdate BOOLEAN DEFAULT FALSE entryDeleted BOOLEAN DEFAULT FALSE} • clientUpdateDoneControlValue ::= SEQUENCE{ reason INTEGER reasonText STRING OPTIONAL cookie OCTET STRING OPTIONAL} • stopClientUpdate extended operations

  5. Event Triggering

  6. Non-persistent Synchronization

  7. Non-persistent Synchronization (cont.)

  8. Persistent Synchronization

  9. Persistent Synchronization (cont.)

  10. Features under discussion • Change type: present in triggered search; attaches a reason for return to each entry sent to the client. Hard to implement for historical changes. • Sending changes: present in DirSync; only modified attributes rather than all attributes requested by the client are returned. • Size Limit: present in DirSync; allows to specify the amount of data (in bytes) that can be sent to the client. Standard LDAP mechanism can be used instead. • Data Ordering: present in DirSync; guarantees that the parent is sent before a child for adds and vise versa for deletes. Useful for hierarchical data but hard to implement.

  11. LCUP and LDUP • The scope of each search operation is restricted to a single LDUP replica. • Each entry returned to the client contains uniqueid as defined in LDUP. The uniqueid can be used by the client to uniquely cross-reference the data in the client’s data store and the directory data. • Protocol features can be implemented efficiently by an LDUP compliant server.

  12. Security Considerations • Access control enforcement on the data. • Use of the protocol is restricted to “trusted” clients. • Mechanism to identify and disconnect malicious clients. • Server behavior is not specified for the case where data becomes not visible to the client due to access control changes. • Proper behavior is not guaranteed if access control on the data is changed from more restrictive to less restrictive one.

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