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The Public Key Infrastructure (PKI) necessary to support the use of certificates in a Windows Server 2003 forest was described in 2. Certificates can also be used by other operating systems and devices on the network. You will need to check for compatibility. The other operating systems can use browser access to request and install certificates. If certificates are chosen as an authentication process for your orga nization, remember to require the setup of a Web-enrollment server.
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Authentication Protocols That Can Be Used by Different Operating Systems
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For communication between systems in a heterogeneous network to occur, a mutual authentication algorithm must exist. Many possible options exist for Windows systems. Non-Windows systems use many systems and protocols that are not compatible with Windows systems. In addition, they might be able to use compatible remote access authentication protocols such as Password Authentication Protocol (PAP) and perhaps Challenge Handshake Authentication Protocol (CHAP), and many use basic authentica tion to Web-based applications. Table 6-4 lists the Windows authentication protocols and indicates the operating systems for which each authentication protocol can be used.
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Lesson 2
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Designing Authentication in a Heterogeneous Network
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6-31
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Although the Kerberos authentication protocol is selected as being available for each operating system, this does not mean it is implemented and available on the version of the operating systems that are present in any environment.
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Table 6-4
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Authentication Protocols and the Operating Systems That Can Use Them
Remote WebAccess Based NTLM NTLMv2 Kerberos Certificates Protocols Protocols No Yes No Yes No No No No Yes Yes Yes Yes
Operating System Windows 95/98 Windows 95/98 with Active Directory client
LM Yes Yes
Windows NT 4.0 Yes service pack 4 Windows 2000 Windows Server 2003 Various minicomputers UNIX Linux UNIX or Linux Samba server AS 400 Mainframe Yes Yes No No No No No
Yes Yes Yes No No No No No
Yes Yes Yes No No No No No
No Yes Yes Yes (some) Yes Yes Yes Yes Yes
Yes Yes Yes Yes Yes Yes Yes Yes Yes
Yes Yes Yes Yes Yes Yes Yes Yes Yes
Yes Yes Yes Yes Yes Yes Yes Yes Yes
Note The question marks in the table are there because some Samba servers require a plain-text password to be used instead of the LM or NTLM network authentication protocol. Other Samba servers can participate and use one or more of the LM-based network authenti cation protocols.
Techniques for Strengthening Authentication Processes
It s not enough to simply find an authentication process that will work across disparate systems. If it were, passing passwords in clear text across the network might turn out to be the one protocol that every operating system might be configured to accept. Instead, you should seek to strengthen authentication protocols and, if this is a more secure solution, allow the use of multiple authentication protocols on the network.
6-32
6
Designing a Logical Authentication Strategy
Examples of choices that can be made and operations that can be implemented to strengthen authentication processes are:
Use NTLMv2 where Kerberos cannot be used on a Windows Network Use Kerberos for authentication between UNIX and Windows systems Use certificates for authentication
The following sections describe these techniques and provide guidelines for when they are appropriate.
The NTLMv2 Technique
In a pure Windows network, or in sections of the network where communication is restricted to Windows machines, you should strengthen authentication by selecting stronger authentication protocols. Stronger authentication protocols can be selected by replacing legacy machines with Windows computers that can use the Kerberos proto col. When replacing legacy machines is not possible, and to ensure that when Kerberos is not used, the strongest authentication protocol you should specify is NTLM and pos sibly NTLMv2. You should also eliminate the LM hash from the account database.
The security option called Network Security: Do Not Store LAN Manager Hash Value on Next Password Change can be used to prevent the storage of the LM hash. Windows 2000 service pack 2 and later and Windows XP computers can accomplish the same task via a registry edit. However, the process is not completed until the next time the user changes his password.
Exam Tip
To select NTLM or NTLMv2:
For Windows 2000 and Windows Server 2003 computers, use the Security Option, Network Security: LAN Manager authentication level. For Windows NT service pack 4 computers, a registry modification must be made. Windows 95/98 computers with the Active Directory client installed can also use NTLM or NTLMv2 if a registry entry is made.
Knowledge Base article 239869 (http://support.microsoft.com/default.aspx scid= kb;en-us;239869) details how to make NTLM and NTLMv2 changes for improved network authentication and session security.
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