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Changes to NTFS Permissions in Windows Vista
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rogue application running in the context of an administrator. Such applications could delete or replace critical operating system files; in Windows Vista, that s possible only if you take ownership of a file and then add an ACE that lets you change or delete it.
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Certain default permissions have changed. Table 29-1 shows the key differences between default permissions in Windows XP and Windows Vista.
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Windows XP ACE Full Control Read & Execute Modify Full Control Full Control Full Control Read Special: Create Folders/ Append Data Special: Create Files/Write Data Read Windows Vista ACE Full Control Read & Execute
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Table 29-1 . Changes to Default NTFS Permissions
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Full Control Full Control
The full panoply of controls over NTFS permissions that you might have seen in earlier versions of Windows remains available in Windows Vista. And unlike Windows XP, in which you had to disable Simple File Sharing (an act that also made other changes besides exposing the security controls), in Windows Vista, the Security tab is always available to all users, in all editions, regardless of whether the Sharing wizard is enabled. As an alternative to the Security tab that appears in the properties dialog box for files and folders, you can view and modify NTFS permissions using a command-line utility. (For details, see Setting Permissions from a Command Prompt, later in this chapter) With NTFS permission controls, you can:
Control access to any file or folder on any NTFS-formatted volume
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Controlling Access to Files and Folders
Allow different types of access for different users or groups of users, include classifications of users not available in the Sharing wizard Fine-tune permissions on specific files or folders
CaUtIOn
Setting NTFS permissions without understanding the full consequences can lead to unexpected and unwelcome results, including a complete loss of access to files and folders . The permission-setting capabilities of the Sharing wizard provide far greater flexibility and power than were possible in the basic Windows XP interface . Before you delve into the inner workings of NTFS permissions on the Security tab, be sure to try the Sharing tab (with the Sharing wizard enabled) . If you do work directly with NTFS permissions without the wizard s assistance, you ll find that working with the built-in permission sets Full Control, Modify, and so on is the safest strategy . If you plan to tinker with special permissions, set up a folder and fill it with test files so that you can experiment safely . When you re certain you ve worked out the correct mix of permissions, apply them to the folders containing your real working files and delete the test folder .
Applying Advanced Security Settings
To view and edit NTFS permissions for a file or folder, right-click its icon, choose Properties, and then click the Security tab. This dialog box lists all the groups and users with permissions set for the selected object. As the example in Figure 29-1 shows, you can assign different permissions to each user in this case, Jan can read and play (Execute) files in the Music folder but is forbidden to change existing files (Modify) or create new ones (Write).
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Controlling Access with NTFS Permissions
Figure 29-1 View permissions for the selected user in the list at the bottom of this dialog box; each user or group can hae a different set of permissions.
In Windows Vista, the owner of a file or folder (typically the person who creates the file) has the right to allow or deny access to that resource. In addition, members of the Administrators group and other authorized users can grant or deny permissions. You can add individual users to the list of users and allow or deny specific types of file and folder actions. You can also assign permissions to built-in groups (Administrators, for instance) or create your own groups and assign permissions that way. As we ll explain later in this section, some permissions don t need to be explicitly defined but instead are inherited based on permissions from a parent folder. All permissions are stored in the file system as part of the access control list (ACL).
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