c# qr code library Part 2: Keeping Your System Secure in Visual C#.NET

Print QR Code ISO/IEC18004 in Visual C#.NET Part 2: Keeping Your System Secure

Part 2: Keeping Your System Secure
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How Simple File Sharing Works
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Microsoft Windows XP Inside Out, Second Edition Note
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You must be a member of the Administrators group to change file sharing options.
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After you make this change, you ll notice a new Security tab in the properties dialog box for any folder stored on an NTFS drive. Figure 8-2, for example, shows the Security settings for a subfolder in the user Ed s My Documents folder. The Allow check boxes are unavailable because these settings are inherited from a higher-level folder. For details about inheritance, see Applying Advanced Security Settings, page 263. When you turn off Simple File Sharing, you plunge into a confusing and potentially dangerous set of options. Even expert Windows users struggle with the proper use of NTFS permissions, and if you make a mistake you can make folders and files inaccessible to yourself and other authorized users. Before you decide to forego the Simple File Sharing interface, make sure that you completely understand the consequences. Read the rest of this chapter carefully, and if you share files and folders over a network, read 25, Managing Shared Folders and Printers, as well, because these settings also have a profound impact on network security.
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Figure 8-2. When you disable Simple File Sharing, you expose the full range of NTFS permissions for files and folders.
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Default Locations for Shared Files
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As noted in the previous section, Windows XP sets aside a group of folders for users to share documents with one another. By default, these folders are located in the All Users profile (on a default setup, the path is C:\Documents And Settings\All Users). File and folder permissions are set so that administrators have full access to these folders.
Part 2: Keeping Your System Secure
Securing Files and Folders Note If your computer belongs to a Windows domain, the shared folder shortcuts referred to in this section aren t available at all. In workgroup setups and on standalone computers, the exact location of each shared folder is defined in the registry using values under the following key: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\ Explorer\Shell Folders. Sorting out the exact location and behavior of shared folders can be confusing. When you open a shared folder in a Windows Explorer window, the folder name that appears in the Address bar doesn t always match the label that appears under the folder icon and in the title bar of the open window. The registry values that define shared folders use completely different names as well. In addition, some shared folders are hidden and at least one doesn t work as you might expect. Confused The following list is not exhaustive, but it should help you make sense of the most frequently used shared folders:
Shared Documents
To access this folder, open the My Computer window. The Shared Documents shortcut actually points to the Documents folder in the All Users profile. Its location is stored in the registry using the value Common Documents. You ll find this subfolder in the Shared Documents folder. Its actual name, confusingly, is My Pictures. Its location is stored in the registry using the value CommonPictures.
Shared Pictures
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Shared Music
This subfolder is also found in the Shared Documents folder. The actual name of this folder is My Music, and its location is stored in the registry using the value CommonMusic.
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Shared Video
This folder appears in the Shared Documents folder if Windows Movie Maker is installed. The folder s actual name is My Videos, and its location is stored in the registry using the value CommonVideo. Any files you copy or move to the Desktop folder in the All Users profile show up on the desktop of all users on the system. Users with limited accounts can view and open these files but cannot rename or delete them. This location is stored in the registry as Common Desktop.
Desktop
Part 2: Keeping Your System Secure
8
Microsoft Windows XP Inside Out, Second Edition
Start Menu
As is the case with the Desktop folder, shortcuts or files you add to this common location appear on the Start menu for all users and can be changed only by members of the Administrators or Power Users group. This location is stored in the registry as Common Start Menu. You might expect this folder to behave like the Desktop and Start Menu folders, merging its contents with the user s personal Favorites collection. Unfortunately, it doesn t. In fact, this folder does nothing at all.
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