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drcom.py
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import socket, struct, time
from hashlib import md5
import sys
import urllib2
class ChallengeException (Exception):
def __init__(self):
pass
class LoginException (Exception):
def __init__(self):
pass
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(("your own ip", 61440))
s.settimeout(3)
SALT = ''
UNLIMITED_RETRY = True
EXCEPTION = False
DEBUG = True
username = "your username"
password = "your password"
mac = 0x123456789011 #your own mac
server = "10.100.61.3" # "auth.jlu.edu.cn"
host_name = "LAPTOP-ABCDEFGH" #can be assigned whatever values
host_os = "DrCOM"
def init(host_name):
tmp = 'ABCDEFGH'
if len(host_name)>=8:
host_name = 'LAPTOP-'+host_name[0:8]
else:
host_name = 'LAPTOP-'+host_name+tmp[0:8-len(host_name)]
return host_name
def challenge(svr,ran):
while True:
t = struct.pack("<H", int(ran)%(0xFFFF))
s.sendto("\x01\x02"+t+"\x6a"+"\x00"*15, (svr, 61440))
try:
data, address = s.recvfrom(1024)
except:
if DEBUG:
print '[challenge] timeout, retrying...'
continue
if address == (svr, 61440):
break;
else:
continue
if DEBUG:
print '[DEBUG] challenge'
if data[0] != '\x02':
raise ChallengeException
print '[challenge] challenge packet sent.'
#print 'salt:',data[2:6].encode('hex')
#print 'addr:',address.encode('hex')
return data[4:8]
def md5sum(s):
m = md5()
m.update(s)
return m.digest()
def dump(n):
s = '%x' % n
if len(s) & 1:
s = '0' + s
return s.decode('hex')
def ror(md5, pwd):
ret = ''
for i in range(len(pwd)):
x = ord(md5[i]) ^ ord(pwd[i])
ret += chr(((x<<3)&0xFF) + (x>>5))
return ret
def keep_alive_package_builder(number,random,tail,type=1,first=False):
data = '\x07'+ chr(number) + '\x28\x00\x0b' + chr(type)
if first :
data += '\x0f\x27'
else:
data += '\xdc\02'
data += random + '\x00' * 6
data += tail
data += '\x00' * 4
#data += struct.pack("!H",0xdc02)
if type == 3:
foo = '\x31\x8c\x21\x3e' #CONSTANT
#CRC
crc = packet_CRC(data+foo)
data += struct.pack("!I",crc) + foo + '\x00' * 8
else: #packet type = 1
data += '\x00' * 16
return data
def packet_CRC(s):
ret = 0
for i in re.findall('..', s):
ret ^= struct.unpack('>h', i)[0]
ret &= 0xFFFF
ret = ret * 0x2c7
return ret
def keep_alive2():
#first keep_alive:
#number = number (mod 7)
#status = 1: first packet user sended
# 2: first packet user recieved
# 3: 2nd packet user sended
# 4: 2nd packet user recieved
# Codes for test
tail = ''
packet = ''
svr = server
import random
ran = random.randint(0,0xFFFF)
ran += random.randint(1,10)
packet = keep_alive_package_builder(0,dump(ran),'\x00'*4,1,True)
s.sendto(packet, (svr, 61440))
data, address = s.recvfrom(1024)
ran += random.randint(1,10)
packet = keep_alive_package_builder(1,dump(ran),'\x00'*4,1,False)
s.sendto(packet, (svr, 61440))
data, address = s.recvfrom(1024)
tail = data[16:20]
ran += random.randint(1,10)
packet = keep_alive_package_builder(2,dump(ran),tail,3,False)
s.sendto(packet, (svr, 61440))
data, address = s.recvfrom(1024)
tail = data[16:20]
print "[keep-alive2] keep-alive2 loop was in daemon."
i = 1
while True:
try:
time.sleep(25)
ran += random.randint(1,10)
packet = keep_alive_package_builder(2,dump(ran),tail,1,False)
#print 'DEBUG: keep_alive2,packet 4\n',packet.encode('hex')
s.sendto(packet, (svr, 61440))
data, address = s.recvfrom(1024)
tail = data[16:20]
#print 'DEBUG: keep_alive2,packet 4 return\n',data.encode('hex')
ran += random.randint(1,10)
packet = keep_alive_package_builder(2,dump(ran),tail,3,False)
#print 'DEBUG: keep_alive2,packet 5\n',packet.encode('hex')
s.sendto(packet, (svr, 61440))
data, address = s.recvfrom(1024)
tail = data[16:20]
#print 'DEBUG: keep_alive2,packet 5 return\n',data.encode('hex')
i = i+1
i = i % (0xFF)
check_online = urllib2.urlopen('http://10.100.61.3')
foo = check_online.read()
if 'login.jlu.edu.cn' in foo:
print '[keep_alive2] offline.relogin...'
break;
#MODIFIED END
'''
if i % 10 == 0:
check_online = urllib2.urlopen('http://10.100.61.3')
foo = check_online.read()
if 'login.jlu.edu.cn' in foo:
print '[keep_alive2] offline.relogin...'
break;
'''
except:
pass
import re
def checksum(s):
ret = 1234
for i in re.findall('....', s):
ret ^= int(i[::-1].encode('hex'), 16)
ret = (1968 * ret) & 0xffffffff
return struct.pack('<I', ret)
def log(data):
print data.encode('hex')
print '====================================='
def mkpkt(salt, usr, pwd, mac):
data = '\x03\01\x00'+chr(len(usr)+20)
data += md5sum('\x03\x01'+salt+pwd)
data += usr.ljust(36, '\x00')
data += '\x00\x00'
data += dump(int(data[4:10].encode('hex'),16)^mac).rjust(6,'\x00')
data += md5sum("\x01" + pwd + salt + '\x00'*4)
data += '\x01\x31\x8c\x31\x4e' + '\00'*12
data += md5sum(data + '\x14\x00\x07\x0b')[:8] + '\x01'+'\x00'*4
host_name = init(host_name)
data += host_name
data += '\x00'.ljust(17,'\x00')+'\x0a\x0a\x0a\x0a\x00\x00\x00\x00\xca\x62\x12\x03'
data += '\x00'.ljust(7,'\x00')+'\x94\x00\x00\x00\x06\x00\x00\x00\x00\x02\x00\x00\x00'
data += '\xf0\x23\x00\x00\x02\x00\x00\x00'
data += host_os
data += b'\x00\xcf\x07\x6a\x00'.ljust(59,'\x00')
data += b'1c210c99585fd22ad03d35c956911aeec1eb449b'
data += '\x00'.ljust(24,'\x00')
data += '\x6d\x00\x00'+chr(len(pwd))
data += ror(md5sum('\x03\x01'+salt+pwd), pwd)
data += '\x02\x0c'
data += checksum(data+'\x01\x26\x07\x11\x00\x00'+dump(mac))
data += "\x00\x00" + dump(mac)
data += '\x00\x00'+'\xa1\x19'
return data
def login(usr, pwd, svr):
import random
global SALT
i = 0
while True:
try:
try:
salt = challenge(svr,time.time()+random.randint(0xF,0xFF))
except ChallengeException:
if DEBUG:
print 'challenge packet exception'
continue
SALT = salt
packet = mkpkt(salt, usr, pwd, mac)
s.sendto(packet, (svr, 61440))
data, address = s.recvfrom(1024)
except:
print "[login] recvfrom timeout,retrying..."
continue
print '[login] packet sent.'
if address == (svr, 61440):
if data[0] == '\x05' and i >= 5 and UNLIMITED_RETRY == False:
print '[login] wrong password, retried ' + str(i) +' times.'
sys.exit(1)
elif data[0] == '\x05':
print "[login] wrong password."
i = i + 1
time.sleep(i*1.618)
elif data[0] != '\x04':
print "[login] server return exception.retry"
if DEBUG:
print '[login] last packet server returned:\n' + data.encode('hex')
time.sleep(1)
raise LoginException
continue;
break;
else:
if i >= 5 and UNLIMITED_RETRY == False :
print '[login] packet received error, maybe you are under attacking'
sys.exit(1)
else:
i = i + 1
print '[login] package error, retrying...'
print '[login] login sent'
return data[-22:-6]
import httplib
def info(ip):
c = httplib.HTTPConnection(ip, 80, timeout=10)
c.request("GET", "")
r = c.getresponse()
if r.status != 200:
return None
s = r.read()
data = dict()
data["flux"] = int(s[s.index("flow='")+6:s.index("';fsele=")])
data["time"] = int(s[s.index("time='")+6:s.index("';flow")])
return data
def keep_alive1(salt,tail,pwd,svr):
foo = struct.pack('!H',int(time.time())%0xFFFF)
data = '\xff' + md5sum('\x03\x01'+salt+pwd) + '\x00\x00\x00'
data += tail
data += foo + '\x00\x00\x00\x00'
print '[keep_alive1] keep_alive1,sent'
s.sendto(data, (svr, 61440))
try:
data, address = s.recvfrom(1024)
print '[keep_alive1] keep_alive1,server received'
except:
print '[keep_alive1] Timeout!'
pass
def main():
print "auth svr:"+server+"\nusername:"+username+"\npassword:"+"********"+"\nmac:"+str(hex(mac))
print "os:MSDOS 8.0"+"\nhostname: localhost"
print "DrCOM Auth Router Ver 1.2"
print "Version feature:\n[1] Auto Anti droping connection\n[2] Stronger exception handling."
while True:
try:
package_tail = login(username, password, server)
except LoginException:
continue
keep_alive2()
if __name__ == "__main__":
main()