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Policy User Account Control: Switch To The Secure Desktop When Prompting For Elevation User Account Control: Virtualize File And Registry Write Failures To Per-User Locations
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Table 9-3 Security Options Default Settings (Continued)
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Note that the Power Users group in Vista is around only to support operations in legacy domains The Power Users group in past platforms enabled users to perform system tasks without being administrators However, using the Power Users group in this way still elevated applications with unnecessary privileges For that reason, UAC does not use the Power Users group, and the permissions granted to the Power Users group on Windows XP have been removed from Vista altogether (you can restore them with a security template) In the Vista era, UAC enables standard users to perform all common configuration tasks and restricts all system tasks to administrators
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UAC treats all accounts the same during logon and while performing normal tasks All users regardless of group membership are given a User Mode token, that is a key that unlocks all the doors that end users typically need to operate their workstations normally and securely Users can launch nonadministrative applications, print, search the desktop, and browse the Internet Users cannot do things such as audit the security log, remove devices, install or uninstall applications that install into %systemroot%, change system settings, and launch many of the administrator tools The following list shows how Vista revamps what standard users can do: Desktop Install fonts, view the system clock and calendar, change the time zone, and change the display settings System Change power management settings, add printers, activate devices (when the required drivers are installed), download and install updates Communications Create and configure virtual private network (VPN) connections and install Wired Equivalent Privacy (WEP) to connect to secure wireless networks
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When a user tries to access a secure part of the workstation, he or she is informed that access is denied and asked if he or she wants to provide administrator credentials Vista, unlike in the past, informs the user about access issues with a pop-up message The same holds true for any applications that are either launched by the user or by itself When the application tries to access restricted areas, the user is notified with a pop-up message and given the chance to provide elevated credentials
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Administrator Mode
When administrators log on, they are given the User Mode token, just as any other user In addition, they are given a second token that identifies them as administrators To make the workstation safe to operate for administrators, Vista also blocks administrators from accessing restricted areas in exactly the same way as if the administrator were a simple user By default, all users present their User Mode tokens first This solves the problem of running a workstation as a full-time administrator The difference is that the pop-up message does not prompt an administrator for administrator credentials; rather, the administrator is asked to approve the action If the logged-on administrator confirms that the access is legitimate, Vista checks the administrator s second token The following list illustrates some of the tasks that only administrators can typically authorize: Desktop Browse to another user s directory
System Add or remove a user account, install and uninstall applications, open the Windows Firewall control panel, and install a driver for a device Communications Configure Remote Desktop and configure parental controls
In Vista, even the administrators act as standard users during normal operations Administrators are blocked from secure areas of the workstation because they only make use of their administrator tokens when needed and when approved A pop-up message will appear, requiring confirmation that you are the one who seeks access, not some rogue application You can see the difference between the administrator user and standard user access tokens by opening two command prompt windows, one run with elevation (right-click and select Run As Administrator) and one run as a standard user In each window, type whoami /all and compare the results User Mode privileges and Administrator Mode privileges are shown in Figures 9-11 and 9-12, respectively
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