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Using Security Templates to Administer Network Security
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The task of implementing server security configurations in a Windows network is threefold. First, you must understand what constitutes good security. Second, you must be able to implement security for the organization s information systems for the equip ment you manage. Finally, you must make sure the tools and methodologies are available for quickly applying a security configuration, and you must understand how to use and maintain them. Ultimately, management must determine the most appropriate security policies, but the discussion here gives you sound reasons for specific security settings. In the past, many tools and low-level Registry adjustments were necessary to fulfill a security policy. Today, however, security templates, and especially their global application through
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Lesson 1
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Implementing Secure Network Administration Procedures
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11-5
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Group Policy, can address the third task: quick enterprisewide application and mainte nance. The first piece of that solution is knowing what to do with the templates.
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Security Templates Snap-In
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You load the Security Templates snap-in in an MMC. By default, several templates are available, you can add more templates, and you can modify settings or develop new templates. The recommended methods of using the templates include the following:
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Design a security baseline for each computer role. Computer roles include domain controllers, file and print servers, mail servers, database servers, network services servers (DHCP, Domain Name System [DNS], Windows Internet Name Service [WINS], and so on), Web servers, remote access servers, desktop systems, and so forth. Design security baselines for major server roles. Security configuration that is com mon to all baselines can be implemented as master baselines. Specifics for unique roles are implemented as supplemental baselines. In a typical Windows Server 2003 network, two master baselines are usually defined, one for domain control lers and one for all other computers. Implement master and additional baselines in security templates. Apply the master templates to all machines and supplemental templates to appro priate machines using deployment tools. You can deploy security templates in several ways, including using batch files that apply the templates directly and Group Policy.
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Designing Master and Supplemental Security Baselines for Security Templates
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The first step in designing the security baseline is to understand what the organization s security policy requires. After you have that information, the next step is to determine which security measures can be fulfilled by using the security templates. You should assign to the master template items that are common to all computer roles, and assign to individual supplemental templates those items that mark the difference between roles. You will have to determine your organization s security policy, but this section describes the security settings that you can implement through security templates. You must implement additional security policy with other tools. Table 11-2 lists each section and subsection of the template and describes how you can use them to implement security policy. You should examine sample templates available in the Security Tem plates snap-in to see the hundreds of possible security settings. You should understand that you can add and manage additional elements in the templates and that you can apply additional security settings using other Windows Server 2003 tools.
11-6
11
Managing Network Security
Note
Browsing the Security Templates snap-in, even changing settings on the templates, does not change the security policy of any computer. To change security, you must apply the template. The exercises that follow provide complete instructions for loading, browsing, mod ifying, creating, and applying security templates.
Table 11-2
Security Template Sections
Subsection Password Policy Account Lockout Policy Description The configuration for passwords, including minimum length, history, complexity, and frequency of change. The number of failed attempts before the account is locked out. How it is reset, and the amount of time between attempts that triggers the failed logon account to start over again. The ticket lifetime, ticket renewal time, whether user logon restrictions are honored, and clock skew time. The types of audit events that are logged. Options include account logon, account management, object auditing, pro cessing auditing, privilege use, and policy change. What users can do on the system. Rights include logon rights, backup and restore, and so on. The implementation of various security settings through Registry settings. A default listing includes items that affect authentication, narrow choices, prevent connection, and so on. The section Understanding Security Template Settings That Affect Network Security gives examples. Also, you can implement any Registry setting you make by adding it to a security template and applying the template. The ability to change size. Defines when logs are overwrit ten, how long records are retained, or both. The ability to manage the memberships of any Windows group. Groups managed here can be added to and accounts removed in the normal manner, but if the tem plate application is refreshed, the group membership is replaced by the membership listed here. The ability to change the startup setting (Disabled, Auto matic, or Manual) for individual services. Also, you can change security for services by determining who can stop, start, and modify startup settings for each service.
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