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CHAPTER 20 Computer Security
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Groups are a great way to get increased complexity without increasing the administrative burden on network administrators, because all network OSs combine permissions When a user is a member of more than one group, which permissions does he or she have with respect to any particular resource In all network OSs, the permissions of the groups are combined, and the result is what you call the effective permissions the user has to access the resource Let s use an example from Windows 2000 If Rita is a member of the Sales group, which has List Folder Contents permission to a folder, and she is also a member of the Managers group, which has Read and Execute permissions to the same folder, Rita will have both List Folder Contents and Read and Execute permissions to that folder Watch out for default user accounts and groups they can become secret back doors to your network! All network OSs have a default Everyone group, and it can be used to sneak into shared resources easily This Everyone group, as its name implies, literally includes anyone who connects to that resource Windows 2000 gives full control to the Everyone group by default, for example, so make sure you know to lock this down
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All of the default groups Everyone, Guest, Users define broad groups of users Never use them unless you intend to permit all those folks to access a resource If you use one of the default groups, remember to configure them with the proper permissions to prevent users from doing things you don t want them to do with a shared resource
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All these groups do only one thing for you: They let you keep track of your user accounts, so you know they are available only for those who need them, and they access only the resources you want them to use
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Security Policies
While permissions control how users access shared resources, you should control other functions that are outside the scope of resources For example, do you want users to be able to access a command prompt on their Windows system Do you want users to be able to install software Would you like to control what systems or what time of day a user can log in All network OSs provide you with some ability to control these and literally hundreds of other security parameters, under what Windows calls policies I like to think of policies as permissions for activities as opposed to true permissions, which control access to resources
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A policy is usually applied to a user account, a computer, or a group Let s use the example of a network composed of Windows XP Professional systems with a Windows Server 2003 system Every Windows XP system has its own local policies program, which enables policies to be placed on that system only Figure 2011 shows the tool you use to set local policies on an individual system, called Local Security Settings, being used to deny the user account Danar the ability to log on locally Local policies work well for individual systems, but they can be a pain to configure if you want to apply the same settings to more than one PC on your network If you want to apply policy settings en masse, you need to step up to Windows Active Directory domain-based Group Policy Using Group Policy, you can exercise deity-like Microsoft prefers to use the term granular control over your network clients Want to set default wallpaper for every PC in your domain Group Policy can do that Want to make certain tools inaccessible to everyone except authorized users Group Policy can do that, too Want to control access to the Internet, redirect home folders, run scripts, deploy software, or just remind folks that unauthorized access to the network will get them nowhere fast Group Policy is the answer Figure 2012 shows Group Policy; I m about to change the default title on every instance of Internet Explorer on every computer in my domain That s just one simple example of the types of settings you can configure using Group Policy You can apply literally hundreds of tweaks through Group Policy, from the great to the small, but don t worry too much about familiarizing yourself with each and every one Group Policy settings are a big topic in the Microsoft Certified Systems Administrator (MCSA) and Microsoft Certified
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