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Contrary to Digest authentication, both LM and NTLM are considered native protocols in Windows. They are very similar, differing mainly in the hash used to compute the response. LM was first used in the LanManager product mentioned earlier. NTLM was designed as a replacement for LM and was released with Windows NT 3.1 in 1993. LM and NTLM are used in authentication in workgroups of Windows NT based operating systems. They are also used in a domain environment if either the client or the server is not a domain member, or if the resource being accessed is specified using an IP address as opposed to a host name. Otherwise, Kerberos is used in Active Directory domains. The reason LM/ NTLM must be used when accessing a resource using an IP address is that Kerberos is based on fully qualified domain names (FQDNs) and there is no way to resolve one of those from an IP address because each host can have multiple aliases. The authentication flow in LM and NTLM typically occurs together. The same message includes both protocols, and no negotiation takes place regarding which protocol is to be used. This is one of the few instances where Windows does not negotiate protocols prior to a transaction. The aggregate flow is shown in Figure 2-8. All Windows NT based operating systems prior to Windows Server 2003 worked as shown in Figure 2-8, sending both the LM and NTLM responses by default. In Windows Server 2003 only the NTLM response was sent by default, while the LM response field was mostly unused. Both protocols were accepted inbound. Starting with Windows Vista and Windows Server 2008, this has changed, as I will explain next.

Figure 6-5: Sequential control flow diagrams for GetOSVersion function. SimpleGetNT5ClientVersion Function

Part I:

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The Getting Started user interface helps you find the right diagram for the job. New shapes and templates help you easily visualize and communicate information, systems, and processes and give your diagrams additional power, flexibility, and professional appeal. AutoConnect helps you create diagrams faster by combining the three main steps choose, connect, and space shapes into a quick single step. A new diagram type called PivotDiagrams enables you to generate a diagram based on the structure of your data. Data Graphics Gallery task pane gives you a new level of control over where and how data fields are displayed in the diagram Integration with Microsoft Office Project 2007 and Microsoft Office SharePoint Server 2007 enable you to effectively communicate information in reports based on project data from those other sources. Save and share your Office Visio 2007 diagrams in PDF format to ensure that they reach the widest possible audience.

However, several different kinds of dependencies are relevant to a network, and in this section I will introduce them and discuss how to mitigate them using standard analysis techniques and actual implementation of these techniques in Windows Server 2008.

//****************************************************************************** // SimpleGetNT5ClientVersion.cs 2008 by Bj Rollison // Returns the Windows NT operating system environment //****************************************************************************** private const int WINDOWS_NT5_KERNEL = 5; private const int WINDOWS_2000 = 0; private const int WINDOWS_XP = 1; A0 private static string SimpleGetNT5ClientVersion() { OperatingSystem osVersionInfo = Environment.OSVersion; string osVersion = string.Empty; switch(osVersionInfo.Version.Major) { case WINDOWS_NT5_KERNEL: switch(osVersionInfo.Version.Minor) { case WINDOWS_2000: osVersion = "Win2K"; break; case WINDOWS_XP: osVersion = "WinXp"; break; } break; } return osVersion; A6 }

The first and simplest kind of dependency is a usage dependency. A usage dependency results from usage of computing resources and data in a manner inconsistent with the trust levels of those resources. The first scenario in this chapter the removable device is an example of a usage dependency. A user that uses a removable device creates a usage dependency on that device. Whenever a user at one trust level uses a resource at a different trust level there are potential usage dependencies. There are other kinds of usage dependencies as well. One great example is usage of a single credential in multiple places. For instance, suppose your network is divided into a datacenter forest and a corporate forest. All the users in the datacenter forest also have accounts in the corporate forest. The likelihood that at least one user will have the same user name and password on both of these accounts is extremely high. Yet this violates the entire purpose of having the two forests, which is to ensure that a compromise in one forest does not result in a compromise of another. By using the same password in both places, this particular user has opened a potential pathway between the two. An attacker that breaches a computer in one forest that this user is using can extract the password hash and use it to authenticate to resources in the other forest.

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Virtually every computer system in existence today accepts password authentication in at least some situations. On Windows Server 2008 as well as previous server versions of Windows you can configure a domain to require smart cards for authentication from one or more users. However, as you saw in 2, Authenticators and Authentication Protocols, even when you do so, there will still be a password hash for the user. This hash is transmitted to the client each time the user authenticates to enable automatic access to NTLM-protected resources. This means that an attacker that has access to this hash can access network resources as this user. For more information on this, see 2.

The first CFD demonstrates how control flow would simply bypass the case statements and return an empty string if the operating system's major version number is not equal to an integer value of 5. If the operating system environment is Windows Server 2003, control flow jumps from the switch statement

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