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Note If you disable the root user, then you will not be able to promote an Open Directory system to a
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replica. The root user does not need to be active during standard replication intervals but will need to be enabled during replica setup.
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Foundations of a Directory Service
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One of the most substantial aspects of Mac OS X Server and its impact on a Mac OS X based network is the ability to run directory services. Open Directory, Apple s native directory service technology, is built on open standards such as OpenLDAP, SASL, and Kerberos. Open Directory gives administrators the ability to centralize usernames and passwords for an environment, increase security, and deploy policies to workstations across the network. For example, using directory services, it becomes possible to lock down client computers with the security settings you want, enforce password policies to keep users from having simple passwords, and limit the frequency passwords are required on the network, greatly increasing the overall security of your environment.
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Defining LDAP
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A directory service organizes hierarchical information such as users, groups, and computers. The directory service is the interface to the directory, and it provides access to the data that is contained in that directory. In addition to Open Directory, popular directory services include OpenLDAP, Active Directory, and eDirectory. The one item that nearly all directory service implementations share is Lightweight Directory Access Protocol (LDAP). LDAP is a centralized data structure that is commonly used to track information such as usernames, computers, printers, and other items on a network by performing fast queries of the database. LDAP is a popular protocol and allows for a wide variety of uses.
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Note When directory services are enabled on the first server of an organization, that server is considered
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the Open Directory master.
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Apple s Open Directory technology runs LDAP on a Berkley Database accessible via OpenLDAP for storing user account information. Slapd is the process behind Apple s implementation of the OpenLDAP server. Slapd hosts access to the Berkeley Database where user account information, such as the user ID, is stored. These accounts are merely sets of attributes and values that, if you were to print them, the output would resemble a spreadsheet. Attributes constitute the makeup of a standard user, such as a username, a unique ID, a home directory path, and a password slot.
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CHAPTER 13 S ERVER S EC URIT Y
Defining Kerberos
Kerberos is a highly secure computer network authentication protocol developed at MIT that allows individuals, communicating over an insecure network, to prove their identity to one another in a secure manner. Kerberos helps prevent eavesdropping to discover passwords or replay attacks (resending packets to obtain similar results from the original transmission) and ensures the integrity of the data. Its designers aimed primarily at a client-server model, and it provides mutual authentication both the user and the service verify each other s identity.
Note In Greek mythology Kerberos was the hound guarding Hades a monstrous three-headed dog with
a snake for a tail and innumerable snake heads on his back.
Kerberos Deconstructed
Apple has modified Kerberos to handle communication with the Apple PasswordServer, which is responsible for building and replicating the user Kerberos database. PasswordServer keeps the passwords encrypted internally on the server, but Kerberos allows computers from the outside to communicate securely with the server. (You ll learn more about PasswordServer a bit later.) Kerberos is divided into three components: the Kerberos key distribution server, the Kerberized service, and the Kerberos client. This trio communicates with a Kerberos network known as a realm. Kerberos guards your passwords and enables single sign-on to configured servers. Kerberos does this by using tickets known as principals to submit credentials over the network rather than sending passwords. Kerberos relies on a series of challenges and session keys that allow a user to be granted a time-sensitive principal known as a ticket-granting ticket (TGT). This TGT contains the time stamp used by the key distribution server to verify its authenticity.
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