How to update existing folder attributes?

Question

I want to change the attributes of Enable access based enumeration, "allow cache to share" and "encrypt data access" in the shared folder using COM Api or WMI.

Earlier, I used Win32_Share to create a shared resource, but it does not have properties to assign these attributes. but then I found out about the " MSFT_SmbShare " class, but I only see the CreateShare method. I had to enable / disable these flags when exiting the share, but could not find any UpdateShare method.

Class MSFT_SmbShare

Please suggest a way to switch these flags to a shared resource using any of the COM API or WMI.

Answer 1

To change these settings, you can use the NetShareSetInfo function , available in the Windows SDK at level 1005.

All flags are defined here, but note that the documentation does not display SHI1005_FLAGS_ENCRYPT_DATA (0x08000), which is actually located in the corresponding Windows LMERR.H header file.

Here is an example demonstrating how to use it in a C # console application:

 class Program { static void Main(string[] args) { // get flags of "myshare" share var flags = NetShareUtilities.Get1005Flags(null, "myshare"); // add the "Require encryption" flag flags |= SHI1005_FLAGS.SHI1005_FLAGS_ENCRYPT_DATA; // save flags (you'll need to have admin rights for this) NetShareUtilities.Set1005Flags(null, "myshare", flags); } } 

Here is the NetShareUtilities class that P / Invoke uses to access the Windows API:

 public static class NetShareUtilities { [DllImport("netapi32.dll")] private extern static int NetShareSetInfo([MarshalAs(UnmanagedType.LPWStr)] string servername, [MarshalAs(UnmanagedType.LPWStr)] string netname, int level, ref SHI1005_FLAGS buf, IntPtr parm_err); [DllImport("netapi32.dll")] private extern static int NetShareGetInfo([MarshalAs(UnmanagedType.LPWStr)] string servername, [MarshalAs(UnmanagedType.LPWStr)] string netname, int level, out IntPtr bufptr); [DllImport("netapi32.dll")] private static extern IntPtr NetApiBufferFree(IntPtr Buffer); public static SHI1005_FLAGS Get1005Flags(string serverName, string name) { IntPtr ptr; int err = NetShareGetInfo(serverName, name, 1005, out ptr); if (err != 0) throw new Win32Exception(err); var flags = (SHI1005_FLAGS)Marshal.ReadInt32(ptr); NetApiBufferFree(ptr); return flags; } public static void Set1005Flags(string serverName, string name, SHI1005_FLAGS flags) { // note: you need to have enough rights to call this int err = NetShareSetInfo(serverName, name, 1005, ref flags, IntPtr.Zero); if (err != 0) throw new Win32Exception(err); } } [Flags] public enum SHI1005_FLAGS { // note: all values are taken from LMERR.H SHI1005_FLAGS_DFS = 0x0001, SHI1005_FLAGS_DFS_ROOT = 0x0002, // these 3 ones are not strict flags, you'll need to use a mask as specified in the official documentation CSC_CACHE_AUTO_REINT = 0x0010, CSC_CACHE_VDO = 0x0020, CSC_CACHE_NONE = 0x0030, SHI1005_FLAGS_RESTRICT_EXCLUSIVE_OPENS = 0x00100, SHI1005_FLAGS_FORCE_SHARED_DELETE = 0x00200, SHI1005_FLAGS_ALLOW_NAMESPACE_CACHING = 0x00400, SHI1005_FLAGS_ACCESS_BASED_DIRECTORY_ENUM = 0x00800, SHI1005_FLAGS_FORCE_LEVELII_OPLOCK = 0x01000, SHI1005_FLAGS_ENABLE_HASH = 0x02000, SHI1005_FLAGS_ENABLE_CA = 0x04000, SHI1005_FLAGS_ENCRYPT_DATA = 0x08000, SHI1005_FLAGS_RESERVED = 0x10000, } 

Answer 2

All of these values ​​seem to be properties of the MSFT_SmbShare class; in particular, FolderEnumerationMode , CachingMode and EncryptData .

After updating the values, use the Put_ method to update.