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(described in the preceding paragraphs), it s actually unrelated. UAC is a method of implementing the rule of least-privilege user access a fancy way of saying that a user account should have the minimum privileges required to perform a task; this practice is intended to prevent malicious programs from using the power of an account to do bad things. With UAC turned on, applications are normally launched using an administrator s standard user token. (Standard users, of course, have only a standard user token.) If an application requires administrator privileges, UAC asks for your consent (if you re logged on as an administrator) or the credentials of an administrator (if you re logged on as a standard user) before letting the application run. With UAC turned off, Windows Vista works in the same (somewhat dangerous) manner as previous versions: administrator accounts can do just about anything (sometimes getting them in trouble), and standard accounts don t have the privileges needed to run many older programs.
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For more information about UAC, see Preventing Unsafe Actions with User Account Control, 10 .
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A new feature in Windows Vista places one more doorway on the way to object access. Somewhat like the discretionary ACLs used to secure file objects, registry keys, and the like, in Windows Vista each securable object has an Integrity Level (IL) access control entry, which can be low, medium, or high. (Objects that don t have an IL specified have an implicit value of medium.) Each process (program) is also marked with an IL: protected mode ( low rights ) Internet Explorer is low, standard processes are medium, and processes that require elevation to administrator are high. A process can open an object for write access only if its IL is equal to or higher than that of the object.
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Windows distinguishes two types of access privileges: permissions and rights. A permission is the ability to access a particular object in some defined manner for example, to write to an NTFS file or to modify a printer queue. A right is the ability to perform a particular systemwide action, such as logging on or resetting the clock. The owner of a resource (or an administrator) assigns permissions to the resource via its properties dialog box. For example, if you are the printer owner or have administrative privileges, you can restrict someone from using a particular printer by visiting the properties dialog box for that printer. Administrators set rights via the Local Security Policy console. (This console is available only in the Business, Enterprise, and Ultimate editions of Windows Vista. In the home editions, rights for various security groups are predefined and unchangeable.) For example, an administrator could grant someone the right to install a device driver.
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In this book, as in many of the Windows messages and dialog boxes, privileges serves as an informal term encompassing both permissions and rights .
Introducing Windows Security
User Accounts and Security Groups
The backbone of Windows Vista security is the ability to uniquely identify each user. While setting up a computer or at any later time an administrator creates a user account for each user. The user account is identified by a user name and is (optionally) secured by a password, which the user provides when logging on to the system. Windows then controls, monitors, and restricts access to system resources based on the permissions and rights associated with each user account by the resource owners and the system administrator. Account type is a simplified way of describing membership in a security group, a collection of user accounts. Windows Vista classifies each user account as one of three account types:
Administrator Members of the Administrators group are classified as administrator accounts. By default, the Administrators group includes the first account you create when you set up the computer and an account named Administrator that is disabled and hidden by default. Unlike other account types, administrators have full control over the system. Among the tasks that only administrators can perform:
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