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Access-based enumeration hides files and folders that users do not have permissions to access. By default, this feature is not enabled for DFS namespaces. You can enable access-based enumeration of DFS folders by using DFS Management. What is accessed based enumeration?Access Based Enumeration (ABE) allows objects (files, folders) on local resources to be hidden from users who do not have permission to access them. How do you use Abe? Right click the share you want to manage in the list of available shares on the right, and select Properties from the menu. In the Properties dialog, click Settings in the list of options on the left. Enable or disable ABE by toggling Enable access-based enumeration. Click OK to save your changes. Does access based enumeration hide shares? ABE does not hide shares. ABE hides content in a share based on user access rights. When ABE is enabled on a share, a user will only see the content that they have access to in the share. How do I add a role in DFS?Open Server Manager, click Manage, and then click Add Roles and Features. The Add Roles and Features Wizard appears. On the Server Selection page, select the server or virtual hard disk (VHD) of an offline virtual machine on which you want to install DFS. Select the role services and features that you want to install. What is share enumeration?Find Windows shares that are readable by everyone, and report details like the number of files in the share and whether the files are writable. This is good for identifying groups of files that may need tighter access control. Windows Share Enumeration is not available to Express Lite users. Does a DFS namespace have its own permissions? The answer is that DFS clients will respect the combination of NTFS and share permissions set on the particular target the client is trying to access. What is access-based enumeration (Abe)? Access-Based Enumeration enables users to see only a subset of files or directories to which they have access permissions when browsing content, versus seeing the complete set of files and folders. ABE enables comingling of files/folders utilizing file access-permissions to restrict visibility and access. How do I enable access based enumeration in Visual Studio?To enable access-based enumeration by using the Windows interface In the console tree, under the Namespaces node, right-click the appropriate namespace and then click Properties . Click the Advanced tab and then select the Enable access-based enumeration for this namespace check box. How do I control access-based enumeration of files and folders?To control access-based enumeration of files and folders in folder targets, you must enable access-based enumeration on each shared folder by using Share and Storage Management. To enable access-based enumeration on a namespace, all namespace servers must be running Windows Server 2008 or newer. Does access-based enumeration increase CPU usage on Windows Server? In some environments, enabling access-based enumeration can cause high CPU utilization on the server and slow response times for users. If you upgrade the domain functional level to Windows Server 2008 while there are existing domain-based namespaces, DFS Management will allow you to enable access-based enumeration on these namespaces. Access-based Enumeration (ABE) allows to hide objects (files and folders) from users who don’t have NTFS permissions (Read or List) on a network shared folder in order to access them. Thus you can provide additional confidentiality of data stored in a shared folder (due to hiding the structure and names of folders and files), improve its usability since users won’t see odd data (they don’t have access to) and, what’s more important, save a system administrator from constant questions of users “Why I cannot access this folder!!!”. Let’s try to consider this technology, configuration peculiarities and use of ABE in various Windows versions in details. How does access to shared folders work in Windows?One of the drawbacks of network shared folders technology in Windows is the fact that by default all users could at least see its structure and the list of all files and directories in such a folder including those that they don’t have NTFS permissions to access (when trying to open such file or folder, a user receives the error “Access Denied”). Why not to hide those files and folders from the users who don’t have permissions to access them? Access-based Enumeration can help doing it. By enabling ABE on a shared folder, you can ensure that different users see a different list of folders and files in the same network share based on the user’s individual access permissions (ACL). How does the interaction between the client and the server occurs when accessing a shared folder over the SMB?
According to this scheme, it becomes clear that the server firstly shows the entire contents of the folder to the user, and the NTFS permissions are checked only when the user tries to open a specific file or folder. Access-based Enumeration (ABE) allows to check access permissions on file system objects before the user receives a list of the folder contents. So, the final list includes only those objects a user has NTFS permissions to access (at least read-only permission), and all inaccessible resources are simply not displayed (hidden). It means that a user from one department (e.g. warehouse) will see one list of files and folders in a shared folder (\\filesrv1\docs). As you can see, only two folders are displayed for the user: Public and Warehouse.  And for a user from another department, e. g., IT department (which is included in another Windows security group), a different list of subfolders is shown. In addition to the Public and Warehouse directories, this user sees 5 more directories in the same network folder. The main disadvantage of using ABE on the Windows file servers is the extra load on the server. It is especially prominent in high load file servers. The more objects there are in the viewed directory, and the more users open files on it, the longer the delay is. According to Microsoft, if there are 15,000 objects (files and directories) in the displayed folder, a folder is opening 1-3 seconds slower. That’s is why it is recommended to pay much attention to making a clear and hierarchical subfolder structure when designing a shared folder structure in order to make a delay when opening folders less evident. Note. You should understand that Access-based Enumeration doesn’t hide the list of the network shared folders on a file server, it hides only their contents. If you need to hide a shared folder from a user, you have to add a $ symbol at the end of the share name. You can manage ABE from the command prompt (abecmd.exe utility), from the GUI, PowerShell or a special API. Access-Based Enumeration RestrictionsAccess-based Enumeration on Windows doesn’t work in the following cases:
Using ABE on Windows Server 2008/ 2008 R2In Windows Server 2008/R2 to use the Access Based Enumeration functionality no additional components need to be installed, since the ABE management feature is already built into the Windows GUI. To enable Access-based Enumeration for a certain folder in Windows Server 2008/2008 R2, open the MMC management console Share and Storage Management (Start –> Programs –> Administrative Tools -> Share and Storage Management). Go to the properties of the necessary share. Then go to the Advanced settings and check Enable access-based enumeration. Configuring Access-based Enumeration on Windows Server 2012 R2/ 2016ABE configuration in the Windows Server 2012 R2 / 2016 is also very simple. To enable ABE in Windows Server 2012, you firstly have to install File and Storage Services role, and then go to the share properties in the Server Manager. In Settings section check the option Enable access-based enumeration. Implementing Access-Based Enumeration on Windows Server 2003In Windows Server 2003 (not supported now), ABE became supported starting from Service Pack 1. To enable Access-based Enumeration in Windows Server 2003 SP1 (or later), you have to download and install a package following this link http://www.microsoft.com/en-us/download/details.aspx?id=17510. During installation you have to specify whether ABE will be enabled for all shared folders on your server or you’ll configure it manually. If you choose the second option, a new tab, Access-based Enumeration, will appear in the network share properties after the installation. To activate ABE for a certain folder, check the option Enable access-based enumeration on this shared folder in its properties. It’s important to mention that Windows 2003 supports DFS-based Access Based Enumeration, but it can be configured only from the command prompt using cacls. Managing ABE from the Command PromptYou can manage Access-based Enumeration settings from the command prompt using Abecmd.exe utility. This tool is a part of Access-based Enumeration package for Windows Server 2003 SP1 (see the link above). Abecmd.exe allows to activate ABE for all directories at once or only for some of them. The next command enables Access-Based Enumeration for all shares:
This one is for a certain folder (e.g., a network shared folder with the name Docs):
Managing Access Based Enumeration Using PowerShellYou can use the SMBShare PowerShell module (installed by default in Windows 10/ 8.1 and Windows Server 2016/2012 R2) to manage the settings of Access Based Enumeration for specific folders. Let’s list the properties of a specific shared folder:
You can check the status of ABE for all shared folders of the server:
To enable ABE for a specific folder:
To disable ABE use the command:
Access-Based Enumeration in Windows 10 / 8.1 / 7Many users, especially in home or SOHO networks, also would like to use Access-Based Enumeration features. The problem is that Microsoft client OSs have neither graphical, nor command interface to manage Access-Based Enumeration. In Windows 10 (Server 2016) and Windows 8.1 (Server 2012R2), you can use PowerShell to manage Access-based Enumeration (see the section above). In older versions of Windows, you need to install the latest version of PowerShell (>= 5.0) or use the abecmd.exe utility from the Windows Server 2003 package, it works fine on client OSs. Since the Windows Server 2003 Access-based Enumeration package is not installed on Windows 10, 8.1 or 7, you have to install it first on Windows Server 2003, and then copy it from the C:\windows\system32 directory to the same folder on the client. After that, you can enable ABE according with the commands described above. Note. In corporate environment, ABE combines perfectly with DFS folders by hiding folders from the user and providing a more convenient structure of the public folders tree. You can enable ABE in DFS using DFS Management or
dfsutil.exe: In addition, you can enable ABE on computers in the AD domain using GPO. This can be done using GPP in the section: Computer Configuration -> Preferences -> Windows Settings -> Network Shares). In the properties of the network folder there is an Access-Based Enumeration option, if you change the value to Enable, ABE mode will be enabled for all shared folders created using this GPO. What does Access Based Enumeration do on a share?Access Based enumeration affects how and whether information on shares is displayed. For instance, to determine which objects need to be hidden from Ms. McNosy as she clicks her way through shared resources, Windows has to check all permissions for all files and folders contained within these folders.
What is NTFS permissions and share permissions?NTFS permissions apply to users who are logged on to the server locally; share permissions don't. Unlike NTFS permissions, share permissions allow you to restrict the number of concurrent connections to a shared folder. Share permissions are configured in the “Advanced Sharing” properties in the “Permissions” settings.
What are the three ways in which a shared folder can be cached?On expanding the Shared Folders, three options will be available named Shares, Session, Open File.
What feature of Windows Server prevents users from seeing shared files and folders they do not have permission to access?Access-based enumeration hides files and folders that users do not have permissions to access. By default, this feature is not enabled for DFS namespaces.
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You would like to share a folder that uses the access-based enumeration feature. what must you do?
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