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The types of actions that require elevation to administrator status (and therefore display a UAC elevation prompt) include those that make changes to system-wide settings or to files in %SystemRoot% or %ProgramFiles%. Among the actions that require elevation:
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Installing and uninstalling applications Installing device drivers Installing ActiveX controls Installing Windows Updates Changing settings for Windows Firewall Changing UAC settings Configuring Windows Update Adding or removing user accounts Changing a user s account type Configuring Parental Controls Running Task Scheduler Restoring backed-up system files Viewing or changing another user s folders and files
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Within Windows Vista, you can identify in advance many actions that require elevation. A shield icon next to a button or link indicates that a UAC prompt will appear.
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At logon, Windows creates a token that is used to identify the privilege levels of your account. Standard users get a standard token, but administrators actually get two: a standard token and an administrator token. The standard token is used to open Explorer.exe (the Windows shell), from which all subsequent programs are launched. Child processes inherit the token of the process that launches them so, by default, all applications run as a standard user even when you re logged on with an administrator
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account. Certain programs request elevation to administrator privileges; that s when the UAC prompt is displayed. If you provide administrator credentials, Windows then opens the program using the administrator token. Note that any processes that the successfully elevated program opens also run as administrator. As an elevation-requesting application attempts to open, UAC evaluates the application and the request and then displays an appropriate prompt. As an administrator, the most common prompt you re likely to see is the consent prompt, which is shown in Figure 101. Read it, check the name of the program, click Continue, and carry on. If you use a standard account, when a program requires elevation, you ll see the credentials prompt, which is shown in Figure 10-2. If the user is able to provide the credentials (that is, user name and password, smart card, or fingerprint, depending on how logon authentication is configured on the computer) of an administrator, the application opens using the administrator s access token.
Figure 10-2 To perform an administratie task, a standard user must enter the password for an administrator account.
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You ll encounter other UAC prompts as well. A colored background near the top of the prompt dialog box provides a quick visual clue to the type of program that s requesting elevation.
Red background and red shield icon Identifies an application from a blocked publisher or one that is blocked by Group Policy; be extremely wary if you see one of these Yellow-orange background and red shield icon Identifies an application (signed or unsigned) that is not yet trusted by the local computer (see Figure 10-3) Blue-green background Identifies an administrative application that is part of Windows Vista (see Figures 10-1 and 10-2, earlier in this chapter) Gray background Identifies an application that is Authenticode signed and trusted by the local computer
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Figure 10-3 . When you install a new program, you ll see a UAC prompt.
In all cases, the UAC dialog box sits atop the secure desktop, a separate process that no other application can interfere with. (If the secure desktop wasn t secure, a malicious program could put another dialog box in front of the UAC dialog box, perhaps with a message encouraging you to let the program proceed. Or a malicious program could grab your keystrokes, thereby learning your administrator logon password.) When the secure desktop is displayed, you can t switch tasks or click the windows on the desktop. (In fact, they re not really windows. When UAC invokes the secure desktop, it snaps a picture of the desktop, darkens it, and then displays that image behind the dialog box.)
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