History
Open Directory began with Mac OS X Server 10.2. In this initial form, Open Directory consisted of a network-visible NetInfo directory domain and a corresponding Authentication Manager service for storing passwords outside of the directory. Version 10.2 also included support for Kerberos. Mac OS X versions 10.1 and 10.0 stored user password information within the directory domain using crypt password authentication authorities, but version 10.2 paved the way for the current Shadow Hash and Password Server mechanisms.
Password Server is the successor to Authentication Manager, and was introduced in Open Directory 2 in Mac OS X Server 10.3. Open Directory 2 was also the first version to use LDAPv3 as the directory domain.
Mac OS X Server 10.4 includes Open Directory 3, which introduced Active Directory domain member support, trusted directory binding, and increased robustness.
Mac OS X Server 10.5 features Open Directory 4 with support for cross-domain authorization and a built-in RADIUS server for managing AirPort base stations. Open Directory 4 no longer includes elements of NetInfo.
Read more about this topic: Apple Open Directory
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