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Designing a Logical Authentication Strategy
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Lesson 2: Designing Authentication in a Heterogeneous Network
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An authentication strategy would not be complete unless it encompassed the use of diverse systems. Today s networks are typically composed of computers running mul tiple operating systems. Every flavor of Windows operating system can be present, along with a mainframe computer, a midrange system such as AS-400, and one or more versions of UNIX, Linux, or both. For users to access resources on these computers, they must authenticate. Keeping in mind that most of these systems do not use the same authentication protocols, how can access be granted
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After this lesson, you will be able to
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Describe the process for designing authentication in a heterogeneous network. List and describe the major network authentication protocols available in Windows
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Server 2003.
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Identify the authentication protocols that can be used by different operating systems. Describe techniques for strengthening authentication processes. Explain the guidelines for designing authentication for a heterogeneous network.
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Estimated lesson time: 60 minutes
The Process: Designing Authentication for a Heterogeneous Network
To design authentication for a heterogeneous network, follow this process: 1. Review available authentication protocols. 2. Document which systems can be configured to use which authentication protocols. 3. Review techniques for strengthening authentication processes. 4. Review best practices and guidelines for designing authentication for a heteroge neous network. 5. Design a solution. The following sections provide the information and guidelines you need to complete this process.
Lesson 2
Designing Authentication in a Heterogeneous Network
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Available Authentication Protocols
Windows Server 2003 does not introduce any new network authentication protocols. Instead, it maintains the ability to be backward compatible with previous versions of Windows. The following authentication protocols must be considered:
Kerberos LAN Manager NTLM and NTLMv2 Certificates Remote access protocols Web-based protocols
This section describes these authentication protocols in detail, except for the remote access protocols and Web-based protocols, which are examined in s 7 and 13, respectively.
Kerberos
Kerberos version 5 is an Internet Engineering Task Force (IETF) RFC 1510 standard network authentication protocol that is recognized as a very secure protocol. Kerberos is the default protocol used between domain members of a Windows Server 2003 or Win dows 2000 domain. The following brief steps describe the Kerberos protocol as imple mented on Windows Server 2003 and some of its security benefits. The Kerberos authentication process is split into two parts: authentication and receipt of the ticket granting ticket (TGT), and using the TGT to obtain session tickets.
How Authentication and Receipt of TGT Works
This is the process: 1. The user enters her logon credentials. 2. The Local Security Authority (LSA) hashes the entered password and then uses it to encrypt the machine time. A plain-text copy of the same timestamp is packaged with the encrypted version. This package, called the authenticator, is passed by the LSA to the Kerberos package on the client. 3. The authenticator is sent to the Kerberos Distribution Center (KDC) or account database on a domain controller.
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Designing a Logical Authentication Strategy
4. The KDC compares the plain-text timestamp with its own system time. If the time difference is not within the Kerberos policy Maximum tolerance for computer clock synchronization, the request is dropped. Otherwise, the process continues. The Kerberos policy is part of the Account Policies of the GPO linked to the domain. 5. The KDC encrypts the plain-text timestamp using the stored password hash of the user and compares the result to the presented encrypted timestamp. 6. If the results match, the user is authenticated and sent a TGT. The TGT includes information encrypted using the password it has of the user s computer, and thus it can be used only by that computer. It also includes authorization information in the form of a list of SIDs, including the user s SID and the SIDs of the groups she is a member of.
How Obtaining Session Tickets Works
This is the process: 1. When the user requests access to a resource, a session ticket must be obtained. The TGT is returned to the KDC along with a fresh authenticator and a request for a specific resource. 2. The KDC checks the plain-text timestamp in the authenticator and rejects the request if the time difference between this stamp and its own clock is greater than the time skew. Otherwise, the inspection continues. 3. The KDC encrypts the plain-text timestamp using the user s password hash from the account database and comparing it to the encrypted timestamp in the authen ticator. 4. If there is a match, a session ticket is prepared and sent to the user. Part of the session ticket is encrypted using the password hash of the user s machine account so that it can be read and stored by the user s computer. Part of the session ticket is encrypted using the password hash of the computer account on which the service or resource resides that the user has requested access to. This allows that computer to know that the material is provided by the KDC. (Only the KDC could know its password.) 5. The session ticket can be used to authenticate to the resource computer.
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