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5. In the right pane, double-click the new group name. You can now define who can be a member of the restricted group and specify other groups of which that group can be a member. 6. Click Add in the Members of this group section and then click Browse. 7. In the Select Users dialog box, locate and select user names. 8. Click Add, and then click OK. The restricted Group Policy defines which users can be members of the specified local group when the specified template is used to configure a Windows XP Professional based system. During configuration, the Security Configuration Tool Set removes all other users that belong to the group at the time of configuration. Similarly, if at the time of configuration the specified user does not belong to the specified group, the Security Configuration Tool Set adds the user to the group. If no users are specified as members of a defined restricted group, the Security Configuration Tool Set removes all current members of that group when the template is used to configure a system. If no groups are specified for a restricted group to belong to, no action is taken to adjust membership in other groups. Inheriting, overwriting, and ignoring policy changes After you define permissions for a file system or registry object, you can use the Security Configuration Tool Set to configure the object s children. If you select Propagate inheritable permissions to all subfolders and files, normal Windows XP Professional ACL inheritance procedures are put into effect that is, any inherited permissions on child objects are adjusted according to the new permissions defined for this parent. Any explicit access control entry (ACE) defined for a child object remains unchanged.

Once the port scan is complete, the hacker can use the list of available ports on the target computer to determine which attacks to launch. Often, simply knowing which ports are listening (such as port 80, the common HTTP port used by Web servers) tells the hacker something about what programs are running on the target computer. These ports can also be probed in more detail by connecting to them manually to see what responses are returned from the target computer. These responses can be used to identify the services and the operating system more specifically. For instance, in the case of a Web server, a manual connection to the HTTP port normally returns the name and version number of the Web server as well as the underlying operating system. With this information, the hacker can then refine his or her attack on the system and perhaps attempt to take advantage of known vulnerabilities in the specific Web server or search for other commonly used services on the target operating system. What, then, are the vulnerabilities that can be exploited There are many different kinds in many different types of software; however, most fall into one of the following categories.

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If you select Replace existing permissions on all subfolders and files with inheritable permissions, all explicit ACEs for all child objects (which are not otherwise listed in the template) are removed, and all child objects are set to inherit the inheritable permissions defined for this parent. To prevent a child object from being overwritten by a parent, the child object can be added to the template and ignored. If a child object is added to the template and ignored, that child s inheritance mode and explicit ACEs remain untouched. Choosing the option Do not allow permissions on this file or folder to be replaced makes sense only if an ancestor of that object is configured to overwrite children. If no ancestor exists in the template, ignoring an object has no impact. If an ancestor exists but is configured so that children inherit, ignoring a child has no impact. By saving a security template file, you can copy the file containing your desired configuration settings to multiple computers running Windows XP Professional. You can analyze, summarize, and evaluate your security policy configuration by using Security Configuration and Analysis tools. For more information about using the Security Configuration and Analysis tools, see Auditing and Analyzing Access Control next in this chapter.

On many computers, the state of the operating system changes frequently. If you, other administrators, or users periodically make changes to computer configurations, auditing and regular analysis will enable you to validate the security configuration on each computer and to verify that security has not been breached. For example, you might want to track who or what is attempting to perform certain tasks, or you might want to obtain information about why certain events are taking place or not taking place. Windows XP Professional provides a number of auditing and analysis features including audit policies, Event Viewer, and the Security Configuration and Analysis snap-in that can aid you in effectively validating the security configurations on the computers in your organization.

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You can monitor many types of events on a Windows XP Professional based system, including user actions such as logging on and logging off, and the success and failure of key application events. Administrators need to monitor these events to track security, system performance, and application errors.