a security scan broke my Mixminion... :-/

[Evert <evert@xxxxxxxxxxxx>]

Hmm, I managed to crash my own Mixminion server with a scan from 
http://www.security4u.org/


Sep 25 11:39:25.645 +0200 [WARN] Unexpected TLS error: unknown 
protocol.  Closing connection to host at 81.169.188.68:44231 (fd 8)
Sep 25 11:39:26.443 +0200 [WARN] Trailing data after EOL from host at 
81.169.188.68:44234 (fd 8)
Sep 25 11:39:26.600 +0200 [WARN] Unexpectedly closed connection to host 
at 81.169.188.68:44234 (fd 8)
Sep 25 11:39:49.748 +0200 [WARN] Bad MMTP protocol string format from 
host at 81.169.188.68:44260 (fd 8)
Sep 25 11:39:49.748 +0200 [FATAL] Exception while running server
Sep 25 11:39:49.804 +0200 [FATAL] Traceback (most recent call last):
   File 
"/home/miniond/lib/python2.3/site-packages/mixminion/server/ServerMain.py", 
line 1236, in runServer
   server.run()
   File 
"/home/miniond/lib/python2.3/site-packages/mixminion/server/ServerMain.py", 
line 922, in run
   self.mmtpServer.process(tickInterval)
   File 
"/home/miniond/lib/python2.3/site-packages/mixminion/server/MMTPServer.py", 
line 768, in process
   AsyncServer.process(self, timeout)
   File 
"/home/miniond/lib/python2.3/site-packages/mixminion/server/MMTPServer.py", 
line 235, in process
   cap)
   File 
"/home/miniond/lib/python2.3/site-packages/mixminion/TLSConnection.py", 
line 448, in process
   while bytesNow < bytesCutoff and self.__stateFn(r, w, maxBytes):
   File 
"/home/miniond/lib/python2.3/site-packages/mixminion/TLSConnection.py", 
line 340, in __dataFn
   cap = self.__doRead(cap)
   File 
"/home/miniond/lib/python2.3/site-packages/mixminion/TLSConnection.py", 
line 417, in __doRead
   self.onRead()
   File 
"/home/miniond/lib/python2.3/site-packages/mixminion/server/MMTPServer.py", 
line 389, in readProtocol
   protocols = m.group(1).split(",")
 AttributeError: 'NoneType' object has no attribute 'group'
Sep 25 11:39:49.804 +0200 [FATAL] Shutting down because of exception: 
exceptions.AttributeError
Sep 25 11:39:49.805 +0200 [INFO] Server shutting down
Sep 25 11:39:49.823 +0200 [INFO] Telling cleanup thread to shut down.
Sep 25 11:39:49.823 +0200 [INFO] Telling processing thread to shut down.
Sep 25 11:39:49.824 +0200 [INFO] Telling delivery thread to shut down.
Sep 25 11:39:49.825 +0200 [INFO] Cleanup thread shutting down.
Sep 25 11:39:49.826 +0200 [INFO] Processing thread shutting down.
Sep 25 11:39:49.828 +0200 [INFO] Delivery thread shutting down.
Sep 25 11:39:49.857 +0200 [INFO] Server is shut down