"Events and Messages : Proactive" - Extreme login security using SMS audit

Event in zFTPServer:
BeforeLoggedIn

Script in zFTPServer:
C:\Scripts\SMSAudit.cmd %USERNAME% %IP%

Error message in zFTPServer:
Access denied

Contents of file "C:\Scripts\SMSAudit.cmd":
@echo off

rem Setup variables
set USER=<sms username>
set PASS=<sms password>

rem Url-encode question to be sent "Allow user to login: %1 (%2)?" set TEXT=Allow%%20user%%20to%%20login%%3A%%20%1%%20%%28%2%%29%%3F

set TO=555123456
set FROM=zFTPAudit
set PARAMS=acc=%USER%^^^&pass=%PASS%^^^&msg=%TEXT%^^^&to=%TO%^^^&from=%FROM%^^^&prio=3

rem Send question to administrator
wget --delete-after http://smsgateway/send.php?%PARAMS% >NUL

rem Wait for answer via SMS or timeout after two minutes
WaitForSMSOrTimeout.exe --timeout 120

rem Only allow login if no error level reported
if ERRORLEVEL 1 exit 1

rem All is OK, go ahead with login
exit 0