/// <summary>
/// Get the File Information and set's the result to <see cref="FileSystemSecurityInformation"/> on success.
/// Also set's owner and owner's domain
/// </summary>
/// <returns>true on success. Use native win32 exception to get further error information</returns>
private void GetSecurityFromFileSystem()
{
IntPtr sidHandle = new IntPtr();
try
{
this.FileSystemSecurityInformation = ReceiveFileSystemSecurityInformation(out sidHandle);
}
finally
{
Win32SafeNativeMethods.LocalFree(sidHandle);
}
}
/// <summary>
/// Gets the security information of specified handle from file system
/// </summary>
/// <param name="sidHandle">Handle to get file security information</param>
/// <returns><see cref="CommonObjectSecurity"/>Result</returns>
private CommonObjectSecurity ReceiveFileSystemSecurityInformation(out IntPtr sidHandle)
{
IntPtr zeroHandle = new IntPtr();
IntPtr pSecurityDescriptor = new IntPtr();
try
{
var namedSecInfoResult = Win32SafeNativeMethods.GetNamedSecurityInfo(PathInfo.FullNameUnc, Win32SecurityObjectType.SeFileObject,
Win32FileSystemEntrySecurityInformation.OwnerSecurityInformation | Win32FileSystemEntrySecurityInformation.DaclSecurityInformation,
out sidHandle, out zeroHandle, out zeroHandle, out zeroHandle, out pSecurityDescriptor);
var win32Error = Marshal.GetLastWin32Error();
// Cancel if call failed
if (namedSecInfoResult != 0)
{
Win32ErrorCodes.NativeExceptionMapping(PathInfo.FullName, win32Error);
}
var securityDescriptorLength = Win32SafeNativeMethods.GetSecurityDescriptorLength(pSecurityDescriptor);
var securityDescriptorDataArray = new byte[securityDescriptorLength];
Marshal.Copy(pSecurityDescriptor, securityDescriptorDataArray, 0, ( int )securityDescriptorLength);
CommonObjectSecurity securityInfo;
if (PathInfo.Attributes.Contains(FileAttributes.Directory))
{
securityInfo = new DirectorySecurity();
securityInfo.SetSecurityDescriptorBinaryForm(securityDescriptorDataArray);
}
else
{
securityInfo = new FileSecurity();
securityInfo.SetSecurityDescriptorBinaryForm(securityDescriptorDataArray);
}
return(securityInfo);
}
finally
{
Win32SafeNativeMethods.LocalFree(zeroHandle);
Win32SafeNativeMethods.LocalFree(pSecurityDescriptor);
}
}