Opc.Ua.Com.ComUtils.GetPrincipalFromUserIdentity C# (CSharp) Method

        public static WindowsPrincipal GetPrincipalFromUserIdentity(UserIdentity user)
        {
            if (UserIdentity.IsDefault(user))
            {
                return null;
            }

            // validate the credentials.
		    IntPtr token = IntPtr.Zero;

		    bool result = LogonUser(
                user.Username,
                user.Domain,
                user.Password, 
			    LOGON32_LOGON_NETWORK, 
			    LOGON32_PROVIDER_DEFAULT,
			    ref token);

		    if (!result)
		    {                    
                throw ServiceResultException.Create(
                    StatusCodes.BadIdentityTokenRejected, 
                    "Could not logon as user '{0}'. Reason: {1}.", 
                    user.Username, 
                    GetSystemMessage(Marshal.GetLastWin32Error(), LOCALE_SYSTEM_DEFAULT));
		    }
            
            try
            {
                // create the windows identity.
                WindowsIdentity identity = new WindowsIdentity(token);

                // validate the identity.
                identity.Impersonate();

                // return a principal.
                return new WindowsPrincipal(identity);
            }
            finally
            {                    
			    CloseHandle(token);
            }
        }