ftps.py

    def run(self):
        self.conn.send('220 Welcome!\r\n')
        while True:
            if not isinstance(self.conn, ssl.SSLSocket): # Can't PEEK at ssl sockets
                if self.conn.recv( 1, socket.MSG_PEEK ) == "\x16":
                   self.conn = ssl.wrap_socket(self.conn, certfile="cert.pem", server_side=True)

            cmd=self.conn.recv(256)
            if not cmd: break
            else:
                try:
                    func=getattr(self,cmd[:4].strip().upper())
                    func(cmd)
                except Exception,e:
                    print 'ERROR:',e
                    traceback.print_exc()
                    self.conn.send('500 Sorry.\r\n')
    # ... snip ...

    def AUTH(self, cmd):
        print repr(cmd)

        if cmd.strip == "AUTH TLS":
            self.conn.send('234 OK.\r\n')
        else:
            self.conn.send('504 Sorry.\r\n')