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By default, a new object s owner is the security principal identified as the default owner in the access token attached to the creating process. When an object is created, the SID stored in the access token s Owner field is copied to the security descriptor s Owner field. The default owner is normally an individual the user who is currently logged on. In Windows XP Professional, you can use Group Policy to modify this rule of object ownership as it pertains to members of the Administrators group. The Group Policy option allows you to reassign ownership of objects created by members of the Administrators group to all members of the group rather than to the individual who created the object. To make the Administrators group the owner of all objects created by its members 1. In Control Panel, click Performance and Maintenance, click Administrative Tools, and then double-click Local Security Policy. 2. Under Security Settings, double-click Local Policies, and then click Security Options. 3. Double-click the policy System objects: Default owner for objects created by members of the administrators group. 4. In the drop-down list box, select Administrators group, and then click OK. Owners of NTFS objects can allow another user to take ownership by giving that user Take Ownership permission. In addition, certain users can take ownership without having permission if they have been assigned the Take ownership of files or other objects (SeTakeOwnershipPrivilege) privilege. By default, this privilege is assigned only to the Administrators group. Determining ownership of objects You can use the dir command to determine the owners of objects in a share or folder. At the command line, type the dir command using the following syntax:
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dir /q [share or folder name]
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Windows XP Professional offers a very fine degree of security control over access to a wide variety of objects. A local file folder, for example, has 14 available permissions, beginning with Read, Write, Modify, and Delete. Both basic and special permissions are available for files and folders.
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The number and type of permissions that are available for any object depend on the security context of the object. For example, the following permissions are available for folders on NTFS partitions:
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Read. Allows a user to see the files and subfolders in a folder and view folder attributes, ownership, and permissions.
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Write. Allows a user to create new files and subfolders with the folder, change folder attributes, and view folder ownership and permissions. List Folder Contents.
Allows a user to see the names of files and subfolders in the folder.
Read & Execute. Gives a user the rights assigned through the Read permission and the List Folder Contents permission. It also gives the user the ability to traverse folders. Traverse folders rights allow a user to reach files and folders located in subdirectories even if the user does not have permission to access portions of the directory path. Modify. Gives a user the ability to delete the folder and perform the actions permitted by the Write and Read & Execute permissions. Full Control. Allows a user to change permissions, take ownership, delete subfolders and files, and perform the actions granted by all other permissions.
The following basic permissions apply to files on NTFS partitions:
Read.
Allows a user to read a file and view file attributes, ownership, and permissions.
Write. Allows a user to overwrite a file, change file attributes, and view file ownership and permissions.
Gives a user the rights required to run applications and perform the actions permitted by the Read permission.
Read & Execute. Modify. Gives a user the ability to modify and delete a file and perform the actions permitted by the Write and Read & Execute permissions. Full Control. Allows a user to change permissions, take ownership, and perform the actions granted by all other permissions.
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