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Administrator user applications Require elevated privileges to run and perform core tasks Administrator applications can perform tasks that require administrator privileges and can write to system locations of both the registry and file system
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Vista determines whether a user needs elevated privileges to run a program by supplying a security token for each application and any associated processes All applications that run on Vista derive their security context from the logged-on user s access token UAC treats all users as standard users, even if the user is an administrator, until the user or the application seeks access to protected systems If an application has a standard token, Vista assumes that elevated (administrator) privileges are not required to run the application and launches it as a standard application If an application has an administrator token, Vista understands that elevated privileges are required to run the application and prompts the user for permission or confirmation prior to running the program
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Installation technologies can often access protected areas of the workstation, including the system directories and registry The mission of UAC regarding software installations is to protect the user and workstation from unauthorized or harmful entities To this end, UAC monitors common installation points and will raise a notice and post a log entry when it detects an installation UAC monitors the following: 32-bit executables Applications without an exposed requested Execution Level property Interactive processes running as a standard user with Least-Privileged User Account (LUA) enabled
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If a 32-bit executable is launched, the thread is checked for the characteristics that qualify it as an installation process: The file name includes keywords like install, setup, update, etc Keywords are in the following Versioning Resource fields: Vendor, Company Name, Product Name, File Description, Original File Name, Internal Name, and Export Name Keywords in the side-by-side manifest are embedded in the executable Keywords in specific StringTable entries are linked in the executable Key attributes in the Emacs Configuration Record (RC) data are linked in the executable There are targeted sequences of bytes within the executable
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If these conditions are met, UAC will halt the execution of the installer process and prompt the currently logged-on user for administrator credentials or for confirmation that the installation is authorized
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Applications written expressly for Vista will integrate smoothly into the daily task of your workstation users These Vista-compatible applications promise to run smoothly and securely To be a viable desktop platform, Vista has to accommodate the library of legacy applications in an equally secure way Software that is not written for Vista is launched at a standard run level by default and in a special compatibility mode This compatibility mode creates an isolated version of the workstation file system and registry the application is free to read and modify this copy while the actual reference file system and registry remain untouched When an application writes to a system location, Vista gives the application a private copy of the file or registry value Any changes are then written to the private copy, and this is stored in the user s profile If the application attempts to read or write to this system location again, it is given the private copy from the user s profile to work with If there is any kind of issue as a result of the system manipulation, the notification and logging will point to the virtualized location rather than to the actual location A consequence of this compatibility mode is that changes to protected systems are, for the most part, going to be user specific Since the changes made are stored in the user s profile, no other user on the workstation will be affected by the update If you are using a legacy application to install a printer, for example, only the logged-on user will be able to access the printer You may have to find a way to facilitate these kinds of changes through a logon script or other automation options if more than one user profile is regularly used on the workstation Before we move on to the next section, there are a couple of notes to share First, Vista-compatible applications will always be accompanied with a manifest file (xml) that holds the User Mode and application run levels necessary to install and operate the application Using the manifest, UAC will know how to support the application to find a balance between reducing the security exposure and ensuring a good user experience The second note is that virtualization of the file system and registry is not included in the 64-bit version of Vista Any application that is installed on such a platform is expected to be Vista compatible and to include a manifest
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