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Controlling Access with NTFS Permissions
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If you then decide that you want to revoke Craig s access rights and give Read permissions to the Administrators group, type this command:
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For more information about command syntax for Icacls, at a command prompt, type icacls with no parameters.
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Taking Ownership of Files and Folders
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When you create a file or folder on an NTFS drive, Windows designates your user account as the owner of that object. That status gives you the right to allow or deny permission for other users and groups to access the file or folder. As owner, you can lock out every other user, including all members of the Administrators group. So what happens if you turn over responsibility for a document (or an entire folder full of documents) to another user As the owner, you can allow the other user to take ownership of the object. In addition, any member of the Administrators group can take ownership of any file or folder. Turning over the ownership of a file or folder makes sense when you want someone else to be responsible for setting permissions for that object. To ensure a smooth transition of power, use either of the following techniques. If you re a member of the Administrators group, follow these steps: 1. Right-click the file or folder icon, and choose Properties. 2. On the Security tab, click Advanced to open the Advanced Security Settings dialog box for the file or folder. 3. Click the Owner tab to display a dialog box that identifies the current owner. To change the owner, click Edit. This and allows you to transfer ownership to the Administrators group or to your account.
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Controlling Access to Files and Folders
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4. Select a name from the Change Owner To list, or click Other Users And Groups to assign ownership to a name not in the list. When you re finished, click OK. If you re not an administrator, you must first be granted the right to take ownership of a file or folder explicitly. To do this, ask the current owner or any member of the Administrators group to add your account to the ACL for the file or folder and give you the Take Ownership permission. This permission can be found at the bottom of the list of special permissions available by clicking Edit in the Advanced Security Settings dialog box. Ultimately, the ability for an administrator to take ownership of files and folders means that you can t count on absolute privacy for any files stored on an NTFS drive. No matter how securely you lock them up, an administrator can break through the lock by taking ownership of the files. This is a brute force solution, however, and it s not something that can be easily hidden. If you re concerned about security and you want to monitor changes in ownership of file-system objects, configure your system so that Take Ownership events in a particular location are audited. For more information, see Monitoring Access to Folders and Files, 31.
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Troubleshooting Permissions Problems
If you use only the Sharing wizard to manage permissions, and if you use default settings in Windows Explorer, you re unlikely to run into NTFS permission roadblocks. But if you veer from this path you might sometimes be flummoxed, wondering why you can t access a particular file or folder.
Troubleshooting Permissions Problems
Permissions and File Operations
Sorting out NTFS permissions is complex enough for a static file. But ordinary file management tasks such as moving and copying files can change permissions, which can have unintended and confusing consequences. In fact, even when a user has been granted Full Control permissions for a given folder, he or she may encounter an access denied error message when trying to open, rename, delete, or copy a file or folder. To understand why this problem occurs, you need to understand what happens when you move or copy files or folders from one location to another. During the move, the permissions for the files or folders may change. Note the different results that apply depending on whether you re moving or copying the object and whether the destination is on the same drive or on a different drive:
When you copy a file or folder to an NTFS drive The newly created folder or file takes on the permissions of the destination folder, and the original object retains its permissions. This is true regardless of whether the destination is on the same NTFS drive as the original file or on a separate NTFS drive. You become the Creator Owner of the new file or folder, which means you can change its permissions. When you move a file or folder to the Public folder or one of its subfolders The moved folder or file retains its original permissions and takes on the permissions of the destination folder. The owner remains unchanged. When you move a file or folder within a single NTFS drive The moved folder or file retains its original permissions and owner. When you move a file or folder from one NTFS drive to another The moved folder or file picks up the permissions of the destination folder and you become the Creator Owner. When you copy or move a file or folder from a FAT32 drive to an NTFS drive The newly created folder or file picks up the permissions of the destination folder and you become the Creator Owner.
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