Shared Folder Permissions in Visual Basic .NET

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Shared Folder Permissions
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Shared folder permissions are simple. Unlike NTFS permissions, there is no differenti ation between basic and advanced permissions. Shared folder permissions are described in Table 5-10.
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Supporting Windows XP File and Folder Access
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Table 5-10
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Shared Folder Permissions
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Allows These Actions User can view file and folder names, execute applications, open and read data files, view file and folder attributes, and navigate the folder hierarchy from the level of the shared folder down. User can perform all actions that are allowed by the Read permission and create and delete files and folders, edit files, and change file and folder attributes. User can perform all actions that are allowed by the Change permission, modify permission assignments, and take ownership.
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Full Control
You grant shared folder permissions on the folder that is shared. Shared permissions are automatically inherited by all files and folders contained in the shared folder, and you cannot disable share permission inheritance all files and folders within the shared folder have the same level of share permissions. If you need varying levels of permissions to files within a shared folder, you have to use a combination of shared folder and NTFS permissions. Shared folder permissions are in effect only when users connect to the shared folder across the network. If a user logs on to a computer locally, the only permissions that take effect are NTFS permissions.
Viewing Shared Folder Permissions
You can view shared folder permissions on the Sharing tab in the Properties dialog box of a shared folder. To view shared folder permissions, follow these steps: 1. In Windows Explorer, locate the folder for which you want to view shared folder permissions. 2. Right-click the folder, and then select Sharing And Security. 3. Click the Permissions button to view the Share Permissions dialog box, shown in Figure 5-16. In this case, we are viewing the share permissions of a folder called Data.
Lesson 3
Supporting Shared Folders
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Figure 5-16 Configure share permissions using the Share Permissions dialog box.
Notice the shared folder permissions assignment in Figure 5-16. The group Everyone has been allowed the Full Control permission. This is the default shared folder permis sion assigned to all shared folders.
Modifying Shared Folder Permissions
You can add, edit, and remove shared folder permissions from the Share Permissions dialog box. To add shared folder permission assignments, follow these steps: 1. In the Sharing tab of the folder s Properties dialog box, click Permissions. 2. In the Share Permissions dialog box, click Add. 3. Select the user accounts or groups to which you want to assign permissions and click OK. You are returned to the Share Permissions dialog box. 4. The default permissions assignment is Read, as shown in Figure 5-17. Modify the permissions as necessary and click OK or Apply.
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Figure 5-17 Add user accounts or groups to the Share Permissions list and then assign spe cific permissions.
Calculating Effective Shared Folder Permissions
The rules for calculating effective shared folder permissions are the same as those used for NTFS permissions:
Allow permissions from all sources are combined, and the user will receive the highest possible level of permission allowed. Deny permissions override allow permissions. If a user has not been assigned any permission from any sources, access is denied.
Note
Shared folder permissions are the only way to control network access to resources on non-NTFS volumes. FAT and FAT32 systems do not have any local file and folder security fea tures. When determining effective permissions on FAT or FAT32 volumes, you calculate only effective shared folder permissions.
Calculating Effective Permissions of Shared Folders on NTFS Volumes
When users connect to shared folders that are located on NTFS volumes, share permis sions and NTFS permissions will combine to control the actions that a user can perform. Determining effective permissions can be somewhat difficult when both NTFS and shared permissions are involved.
Lesson 3
Supporting Shared Folders
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Calculating effective permissions for resources within a shared folder on an NTFS par tition is a three-step process: 1. Calculate the NTFS effective permissions for the user. 2. Calculate the shared folder effective permissions for the user. 3. Analyze the results of Steps 1 and 2, and select the result that is the more restric tive of the two. This will be the user s effective permission for the shared folder. Table 5-11 illustrates effective permissions calculations for shared folders on NTFS par titions. In these examples, the user JSmith is a member of the groups Managers, IT, and Everyone. For simplicity, all permissions specified are allow permissions.
Table 5-11
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