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In Mac OS X Server, 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. (We ll discuss PasswordServer a bit later.)
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CHAPTER 16: Server Security
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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 identifying each user and server with a principal. A principal is then assigned a time-sensitive ticket or (TGT) to submit credentials over the network rather than sending passwords, establishing a session. Kerberos relies on a series of challenges and session keys that then allow a user or server a TGT assigned to the user s principal. The TGT contains the time stamp used by the key distribution server to verify its authenticity. NOTE: Apple s implementation of the MIT Kerberos key distribution server (KDC) is krb5kdc. The TGT is issued as an authentication token to gain access to additional service tickets during the TGT s lifetime. This can be illustrated by logging in at the loginwindow as an Open Directory or Active Directory user, which authenticates you to the directory server and provides a TGT placed in a shared credentials cache. Other services such as file sharing will then provide single sign-on based on the TGT. NOTE: Clients who are using Open Directory for authentication (known as binding) will be automatically configured to use Kerberos using special entries provided and updated by the LDAP server. You can manually initialize the configuration by using the kerberosautoconfig command, but this is typically not required. One of the most critical aspects of Kerberos configuration is time synchronization. If a client or server is more than five minutes apart from its Kerberos KDC server, then authentication will fail. This value is normally best synchronized using the Network Time Protocol (NTP). To enable the NTP service on the Mac OS X Server, configure the server as your Open Directory master (explained a bit later in the section Configuring and Managing Open Directory ), and enable the NTP check box in the General settings of the Server Admin application. The NTP setting can then be pushed out to client machines using scripts or applications. The NTP client setting can also be configured manually in the Date & Time pane of System Preferences. TIP: You can also manually initiate time synchronization using the command line with the following command: sudo ntd -q. Another important consideration for Kerberos is DNS. Prior to setting up an Open Directory master or replica, make sure that the server s DNS is accurate in both forward and reverse DNS resolution. To do so, run the changeip command with the checkhostname option, as follows:
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CHAPTER 16: Server Security
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Kerberos is frequently called the keys to the kingdom, on an OS X Server. An improperly configured Open Directory service can give way to those keys. If a Kerberos system is deployed on an OS X Server, it s important to make sure the services on your Open Directory servers are properly patched and securely locked down. Let s discuss the proper ways to do just that. NOTE: Typically, a secure Kerberos environment consists of a standalone system that doesn t run any other services and is used as a KDC. However, in Mac OS X Server the Open Directory Master already runs other services, such as passwordserver and LDAP. Therefore, for a fully secure environment we recommend running your Open Directory master on a dedicated host that isn t running any other services other than the Open Directory master service.
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