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Common Security Scenarios
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can and cannot do. This in turn will help you with the timing of updating and mitigating security issues. Having those workstations be a part of the security fabric of the network helps a great deal. The Windows Firewall with Advanced Security is located under Computer Configuration, Windows Settings, Security Settings, and under a special category titled Windows Firewall With Advanced Security. In Windows Server Code Name Cougar, the hard work of setting up these policies is done for you. As you can see in Figure 15-16, the Cougar server has pre-enabled inbound rules, and outbound rules are staged so that if you do enable outbound filtering, the core organization needs of networking, printing, remote assistance, and remote desktop will be served.
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Figure 15-16 Group policy settings for Windows Vista Advanced Firewall set by the server.
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Windows XP workstations can also participate in this mitigation and restrictions. The worst thing you can do in a small organization is to consider the external firewall good enough and believe that there is no need to enable these internal firewalls. Take the time to understand how internal firewalls can add needed limitations. Located under Computer Configuration, Administrative Templates, Network, Network Connections, Domain profile, review the Small Business Tweaks document on the book s companion CD for details on the recommended policies for a small network shown in Figure 15-17. For more information on the power of group policy, also review 7.
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One of the best ways to secure a small network (and arguably any network) is to practice a procedure of standardization This is one of the most difficult security settings to enable.
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In fact, it can be nearly impossible. It may break older LOB applications. It is merely a goal to get every workstation on the same platform (arguably the latest desktop operating system the vendor has), the same service pack, to ensure that each application is also updated and has also gone through the same level of security code review that is the norm for the Windows Secure Development Lifecycle. If you are lucky enough to achieve this goal, you can make additional settings such as ensuring that all Terminal Services/Remote Desktop sessions only are set to support Network Level Authentication, and setting the authentication levels to the highest such as Send Ntlmv2 Response Only\Refuse LM & NTLM.
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Figure 15-17 Group policy settings for Windows XP as set by the server.
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Recommendations for Additional Server Settings and Configurations
Blindly following security hardening guidance is not recommended. But that does not mean that some settings on the server should not be reviewed for your specific needs. The following sections offer a few recommendations for a small firm network.
DsrmAdminLogonBehavior
In a single domain controller setup, consider modifying a new registry value in Windows Server 2008 called DsrmAdminLogonBehavior. It is located under HKLM\system\ currentcontrolset\Control\Lsa and will allow you to log onto the domain controller if Active Directory Domain Services is stopped. The DSRM administrator password that is set up separately when you promote a server to be a domain controller using dcpromo.exe does not get password policies applied to it. Thus as a mitigation, the default for Windows Server 2008 is to allow the DSRM administrator to log on only when Active Directory services are running. In a typical multi-domain controller network, the loss of one server would not be an issue because any of the other domain controllers can authenticate. Therefore, DSRMAdminLogonBehavior is configured to prevent logon when the Active Directory services are stopped. Obviously, in a single domain controller network this could prevent you from logging on to the server and recovering it. Thus, in a single domain controller environment, this is a recommended setting.
Part III:
Common Security Scenarios
Figure 15-18 highlights this new registry setting, which has the following values: 0 DSRM admin can only log on in DSRM mode when Active Directory Domain service is running. (This is the default.) 1 DSRM admin can log on in DSRM and when Active Directory Domain Services service is stopped. 2 DSRM admin can log on at any time. This one quick setting solves the issue of not being forced to hard-reboot a domain controller, which is probably a good thing.
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