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01 - 02 - 03 - 04 - 05 - 06 - 07 - 08 - 09 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - Contents of a Microsoft Kerberos Ticket There are additional items contained in Microsoft Kerberos tickets that are not in other Kerberos implementations tickets. Windows 2000 uses Security Identifiers (SIDs) just as in previous versions of Windows NT. SIDs are used to represent user accounts and groups. The SID for a user, along with any SIDs for the groups the user belongs to, is included in tickets used by the client and is known as the Privilege Attribute Certificate (PAC). The PAC is not the same thing as a public key certificate. The user’s name, also known as User Principal Name, is added to the ticket as UPN:name@domain. For example, UPN:stace@sdc.biloxi.ms.us is placed in a ticket to identify the user Stace. Delegation of Authentication Kerberos supports two methods of delegation: proxiable tickets and forwardable tickets. Microsoft Kerberos provides support for forwardable tickets only, and the default Kerberos policy for Windows 2000 domains assigns this permission only to members of the Domain Admins group. It can be provided to individual users by modifying the user’s account from Active Directory Users and Computers. To access user accounts in Active Directory, click Start, highlight Programs, highlight Administrative Tools, and click Active Directory Users and Computers. The account option for enabling delegation is available on the Account tab of a user’s properties, as shown in Figure 3.12. An account option is also available to not allow the acceptance of delegated credentials. Figure 3.12 This is the way to enable a user account for delegation of authentication. Preauthentication In Kerberos authentication, some of the messages have a preauthentication field. Microsoft Kerberos uses preauthentication in domains by default. The data contained in this field is the encrypted timestamp of the client. If it is necessary, preauthentication can be turned off for user accounts on an individual basis, as shown in Figure 3.13. It may be necessary to turn off preauthentication if you are integrating Microsoft Kerberos with other variations of the Kerberos protocol. Figure 3.13 This is the way to disable a preauthentication for a user account. 01 - 02 - 03 - 04 - 05 - 06 - 07 - 08 - 09 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - |
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Updated 211 minutes ago.
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