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Anyone who s ever struggled to figure out NTFS permissions in Windows 2000 or Windows NT will really appreciate the Effective Permissions dialog box in Windows Vista . It s a wonderful addition, and if you re going to use NTFS permissions you should learn its ins and outs . Unfortunately, it also includes one potentially confusing interface element . The Group Or User Name box looks like a place to enter text directly, but it doesn t work that way in practice . You have to display the Select User Or Group dialog box to enter a name .
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The resulting dialog box shows the effective permissions that apply to the user or group you selected. These permissions are presented using the complete list of available permissions from the Advanced Security Settings dialog box, which are far more detailed than those shown on the Security tab. This level of detail can be difficult to decipher, but it s crucial in identifying subtle changes that can compromise security. In the example in Figure 29-5, for instance, the user named Benito has permissions that are equivalent to Read & Execute.
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Figure 29-5 Use this dialog box to see how permissions through user accounts and groups combine for a gien user. Check marks indicate which permissions are assigned.
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The effective permissions calculation looks up all local and domain groups to which a user or group belongs and takes those permissions into account in its summary. A check mark identifies permissions that have been assigned. The resulting display is a snapshot of permissions based on other settings. You can t change any permissions from this dialog box.
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The effective permissions calculation does not include the Anonymous Logon or Authenticated Users group, nor does it include settings granted because a user is the Creator Owner of an object . In addition, the calculation does not consider whether you re logging on interactively or over a network . If you ve customized any of these permissions, you ll need to account for the differences .
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Using Special Permissions
Don t be misled by the long list of so-called special permissions that you see when you click Advanced on the Security tab, click Edit, select a user or group name, and then click Edit. Whenever you use NTFS permissions, whether it s through the Sharing wizard or the more full-featured Permissions dialog box, your actions result in changes to this list. Using the built-in permission options Full Control, Modify, and so on actually sets predetermined groups of permissions here. Figure 29-6, for instance, shows the results when you select the Allow box next to the Read & Execute entry Windows actually sets five individual permissions in response to the single click.
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Figure 29-6 In general, you don t need to adjust these so-called special permissions. Using the check boxes in the Permissions dialog box makes the adjustments for you.
Controlling Access with NTFS Permissions
When dealing with unusual access control situations, the best solution is usually to start by applying the predefined basic permission that comes closest to the desired result. Then add or remove special permissions as needed. Table 29-4 lists the full set of special permissions that are applied when you set each of the predefined permission options.
Table 29-4 . Special Permissions Applied by Basic Permissions
Basic Permission Read
Special Permissions List Folder / Read Data Read Attributes Read Extended Attributes Read Permissions All Read special permissions listed above Traverse Folder / Execute File Create Files / Write Data Create Folders / Append Data Write Attributes Write Extended Attributes All Read & Execute permissions listed above All Write special permissions listed above Delete All special permissions listed above Delete Subfolders And Files Change Permissions Take Ownership
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