DumpNTLMInfo.py

#!/usr/bin/env python
# Impacket - Collection of Python classes for working with network protocols.
#
# Copyright Fortra, LLC and its affiliated companies 
#
# All rights reserved.
#
# This software is provided under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
# Description:
#   Dump remote host information in ntlm authentication model, without credentials.
#   For SMB protocols (1/2/3), it's easy to use SMBConnection class (thanks to @agsolino), 
#   but since negotiate response is not available in original classes, 
#   we made out custom classes based on them.
#   The usefull information in negotiate response are "Dialect Version", "Signing Options",
#   "Maximum bytes allowed per smb request" and "Servers time information".
#   The point is sometimes server dosn't include "boot time" in response. But we show it,
#   when available, in this script.
# 
#   It's very easy to use:
#       python DumpNTLMInfo.py 192.168.1.63
#
# Author:
#   Alex Romero (@NtAlexio2)
#
# Reference for:
#   [MS-SMB2]
#   [MS-RPCE]
#
# ToDo:
#   [ ] MSSQL
#   [ ] Find new protocols using NTLM for authentication in network.
# 

import os
import sys
import argparse
import logging
import struct
import socket
import math, string, random
from six import indexbytes
from datetime import datetime, timedelta, timezone

from impacket import version
from impacket import nmb, ntlm
from impacket.examples import logger
from impacket.smb import SMB, NewSMBPacket, SMBCommand, SMBNTLMDialect_Parameters,\
    SMBNTLMDialect_Data, SMBExtended_Security_Parameters, SMBExtended_Security_Data, UnsupportedFeature,\
    SMBSessionSetupAndX_Extended_Data, SMBSessionSetupAndX_Extended_Parameters, SMBSessionSetupAndX_Extended_Response_Parameters,\
    SMBSessionSetupAndX_Extended_Response_Data, SMBSessionSetupAndXResponse_Parameters, SMB_DIALECT
from impacket.smb3structs import *
from impacket.spnego import SPNEGO_NegTokenInit, SPNEGO_NegTokenResp, TypesMech
from impacket.nt_errors import STATUS_SUCCESS, STATUS_MORE_PROCESSING_REQUIRED
from impacket.uuid import uuidtup_to_bin
from impacket.dcerpc.v5 import transport, epm
from impacket.dcerpc.v5.rpcrt import *


EPOCH_AS_FILETIME = 116444736000000000  # January 1, 1970 as MS file time


class RPC:
    def __init__(self, target) -> None:
        self.MaxTrasmitionSize = 0
        self._initializeTransport(target)

    def GetChallange(self):
        ntlmChallenge = None
        packet = self._create_bind_request()
        self._rpctransport.send(packet.get_packet())
        buffer = self._rpctransport.recv()
        if buffer != 0:
            response = MSRPCHeader(buffer)
            bindResp = MSRPCBindAck(response.getData())

            self.MaxTrasmitionSize = bindResp['max_rfrag']

            ntlmChallenge = ntlm.NTLMAuthChallenge(bindResp['auth_data'])
        return ntlmChallenge

    def _initializeTransport(self, target):
        self._rpctransport = transport.DCERPCTransportFactory(r'ncacn_ip_tcp:%s[135]' % target)
        self._rpctransport.set_credentials('', '', '', '', '')
        self._rpctransport.set_dport(135)
        self._rpctransport.connect()

    def _create_bind_request(self):
        bind = MSRPCBind()
        item = CtxItem()
        item['AbstractSyntax'] = epm.MSRPC_UUID_PORTMAP
        item['TransferSyntax'] = uuidtup_to_bin(('8a885d04-1ceb-11c9-9fe8-08002b104860', '2.0'))
        item['ContextID'] = 0
        item['TransItems'] = 1
        bind.addCtxItem(item)

        packet = MSRPCHeader()
        packet['type'] = MSRPC_BIND
        packet['pduData'] = bind.getData()
        packet['call_id'] = 1

        auth = ntlm.getNTLMSSPType1('', '', signingRequired=True, use_ntlmv2=True)
        sec_trailer = SEC_TRAILER()
        sec_trailer['auth_type']   = RPC_C_AUTHN_WINNT
        sec_trailer['auth_level']  = RPC_C_AUTHN_LEVEL_PKT_INTEGRITY
        sec_trailer['auth_ctx_id'] = 0 + 79231 
        pad = (4 - (len(packet.get_packet()) % 4)) % 4
        if pad != 0:
           packet['pduData'] += b'\xFF'*pad
           sec_trailer['auth_pad_len']=pad
        packet['sec_trailer'] = sec_trailer
        packet['auth_data'] = auth

        return packet


class SMB1:
    def __init__(self, remote_name, remote_host, my_name=None, 
                    sess_port=445, timeout=60, session=None, negSessionResponse=None):
        self._uid = 0
        self._dialects_data = None
        self._SignatureRequired = False
        self._dialects_parameters = None
        self.__flags1 = SMB.FLAGS1_PATHCASELESS | SMB.FLAGS1_CANONICALIZED_PATHS
        self.__flags2 = SMB.FLAGS2_EXTENDED_SECURITY | SMB.FLAGS2_NT_STATUS | SMB.FLAGS2_LONG_NAMES
        self.__timeout = timeout
        self._session = session
        self._my_name = my_name
        self._auth = None

        if session is None:
            self._session = nmb.NetBIOSTCPSession(my_name, remote_name, remote_host, nmb.TYPE_SERVER, sess_port, self.__timeout)

        self._negotiateResponse = self._negotiateSession(negSessionResponse)

    def GetNegotiateResponse(self):
        return self._negotiateResponse

    def GetChallange(self):
        packet = NewSMBPacket()
        if self._SignatureRequired:
           packet['Flags2'] |= SMB.FLAGS2_SMB_SECURITY_SIGNATURE
        sessionSetup = self._createSessionSetupRequest()
        packet.addCommand(sessionSetup)
        self.send(packet)
        packet = self.receive()
        if packet.isValidAnswer(SMB.SMB_COM_SESSION_SETUP_ANDX):
            self._uid = packet['Uid']
            sessionResponse   = SMBCommand(packet['Data'][0])
            sessionParameters = SMBSessionSetupAndX_Extended_Response_Parameters(sessionResponse['Parameters'])
            sessionData       = SMBSessionSetupAndX_Extended_Response_Data(flags = packet['Flags2'])
            sessionData['SecurityBlobLength'] = sessionParameters['SecurityBlobLength']
            sessionData.fromString(sessionResponse['Data'])
            self._respToken = SPNEGO_NegTokenResp(sessionData['SecurityBlob'])
            ntlmChallenge = ntlm.NTLMAuthChallenge(self._respToken['ResponseToken'])
            return ntlmChallenge

    def Authenticate(self):
        type3, _ = ntlm.getNTLMSSPType3(self._auth, self._respToken['ResponseToken'], '', '', '', '', '', use_ntlmv2=True)

        packet = NewSMBPacket()
        if self._SignatureRequired:
            packet['Flags2'] |= SMB.FLAGS2_SMB_SECURITY_SIGNATURE

        respToken2 = SPNEGO_NegTokenResp()
        respToken2['ResponseToken'] = type3.getData()
        sessionSetup = self._createSessionSetupRequest()
        sessionSetup['Parameters']['SecurityBlobLength'] = len(respToken2)
        sessionSetup['Data']['SecurityBlob'] = respToken2.getData()

        packet.addCommand(sessionSetup)
        self.send(packet)
        packet = self.receive()

        try:
            if packet.isValidAnswer(SMB.SMB_COM_SESSION_SETUP_ANDX):
                sessionResponse   = SMBCommand(packet['Data'][0])
                sessionParameters = SMBSessionSetupAndXResponse_Parameters(sessionResponse['Parameters'])
                self._action = sessionParameters['Action']
                return True
        except:
            pass
        return False

    def send(self, negoPacket):
        negoPacket['Uid'] = self._uid
        negoPacket['Pid'] = (os.getpid() & 0xFFFF)
        negoPacket['Flags1'] |= self.__flags1
        negoPacket['Flags2'] |= self.__flags2
        self._session.send_packet(negoPacket.getData())

    def receive(self):
        r = self._session.recv_packet(self.__timeout)
        return NewSMBPacket(data = r.get_trailer())

    def _negotiateSession(self, negPacket = None):
        def parsePacket(negoPacket):
            if negoPacket['Flags2'] & SMB.FLAGS2_UNICODE:
                self.__flags2 |= SMB.FLAGS2_UNICODE

            if negoPacket.isValidAnswer(SMB.SMB_COM_NEGOTIATE):
                sessionResponse = SMBCommand(negoPacket['Data'][0])
                self._dialects_parameters = SMBNTLMDialect_Parameters(sessionResponse['Parameters'])
                self._dialects_data = SMBNTLMDialect_Data()
                self._dialects_data['ChallengeLength'] = self._dialects_parameters['ChallengeLength']
                self._dialects_data.fromString(sessionResponse['Data'])
                if self._dialects_parameters['Capabilities'] & SMB.CAP_EXTENDED_SECURITY:
                    self._dialects_parameters = SMBExtended_Security_Parameters(sessionResponse['Parameters'])
                    self._dialects_data = SMBExtended_Security_Data(sessionResponse['Data'])
                    if self._dialects_parameters['SecurityMode'] & SMB.SECURITY_SIGNATURES_REQUIRED:
                        self._SignatureRequired = True
                else:
                    if self._dialects_parameters['DialectIndex'] == 0xffff:
                        raise UnsupportedFeature("Remote server does not know NT LM 0.12")

                return self._wrapper(sessionResponse)

        if negPacket is None:
            negoPacket = NewSMBPacket()
            negSession = SMBCommand(SMB.SMB_COM_NEGOTIATE)
            self.__flags2 = self.__flags2 | SMB.FLAGS2_EXTENDED_SECURITY

            negSession['Data'] = b'\x02NT LM 0.12\x00'
            negoPacket.addCommand(negSession)
            self.send(negoPacket)

            negoPacket = self.receive()
            return parsePacket(negoPacket)

        return parsePacket(NewSMBPacket(data = negPacket))

    def _createSessionSetupRequest(self):
        sessionSetup = SMBCommand(SMB.SMB_COM_SESSION_SETUP_ANDX)
        sessionSetup['Data'] = SMBSessionSetupAndX_Extended_Data()
        sessionSetup['Parameters'] = SMBSessionSetupAndX_Extended_Parameters()
        sessionSetup['Parameters']['MaxBufferSize'] = 61440
        sessionSetup['Parameters']['MaxMpxCount'] = 2
        sessionSetup['Parameters']['VcNumber'] = 1
        sessionSetup['Parameters']['SessionKey'] = 0
        sessionSetup['Parameters']['Capabilities'] = SMB.CAP_EXTENDED_SECURITY | SMB.CAP_USE_NT_ERRORS | SMB.CAP_UNICODE | SMB.CAP_LARGE_READX | SMB.CAP_LARGE_WRITEX

        blob = SPNEGO_NegTokenInit()
        blob['MechTypes'] = [TypesMech['NTLMSSP - Microsoft NTLM Security Support Provider']]
        self._auth = ntlm.getNTLMSSPType1(self._my_name, '', self._SignatureRequired, use_ntlmv2=True)
        blob['MechToken'] = self._auth.getData()

        sessionSetup['Parameters']['SecurityBlobLength']  = len(blob)
        sessionSetup['Parameters'].getData()
        sessionSetup['Data']['SecurityBlob'] = blob.getData()
        sessionSetup['Data']['NativeOS']      = 'U\x00n\x00i\x00x\x00\x00\x00'
        sessionSetup['Data']['NativeLanMan']  = 'S\x00a\x00m\x00b\x00a\x00\x00'

        return sessionSetup

    def _wrapper(self, sessionResponse):
        sessionResponse['SecurityMode'] = 0x0
        sessionResponse['DialectRevision'] = SMB_DIALECT
        if self._dialects_parameters['SecurityMode'] & SMB.SECURITY_SIGNATURES_ENABLED:
            sessionResponse['SecurityMode'] = SMB2_NEGOTIATE_SIGNING_ENABLED
            if self._SignatureRequired:
                sessionResponse['SecurityMode'] |= SMB2_NEGOTIATE_SIGNING_REQUIRED
        sessionResponse['MaxReadSize'] = self._dialects_parameters['MaxBufferSize']
        sessionResponse['MaxWriteSize'] = self._dialects_parameters['MaxBufferSize']
        sessionResponse['SystemTime'] = self._to_long_filetime(self._dialects_parameters['LowDateTime'], self._dialects_parameters['HighDateTime'])
        sessionResponse['ServerStartTime'] = 0 # SMB1 has not boot time totally
        return sessionResponse

    def _to_long_filetime(self, dwLowDateTime, dwHighDateTime):
        temp_time = dwHighDateTime
        temp_time <<= 32
        temp_time |= dwLowDateTime
        return temp_time


class SMB3:
    def __init__(self, remote_name, remote_host, my_name=None, 
                    sess_port=445, timeout=60, session=None, negSessionResponse=None):
        self._NetBIOSSession = session
        self._sequenceWindow = 0
        self._sessionId = 0
        self._timeout = timeout
        self._auth = None

        if session is None:
            self._NetBIOSSession = nmb.NetBIOSTCPSession(my_name, remote_name, remote_host, nmb.TYPE_SERVER, sess_port, timeout)
        else:
            self._sequenceWindow += 1

        self._negotiateResponse = self._negotiateSession(negSessionResponse)

    def GetNegotiateResponse(self):
        return self._negotiateResponse

    def GetChallange(self):
        packet = self._createSessionSetupRequest(self._negotiateResponse['DialectRevision'])

        self.send(packet)
        self._answer = self.receive()

        sessionSetupResponse = SMB2SessionSetup_Response(self._answer['Data'])
        self._respToken = SPNEGO_NegTokenResp(sessionSetupResponse['Buffer'])
        ntlmChallenge = ntlm.NTLMAuthChallenge(self._respToken['ResponseToken'])

        return ntlmChallenge

    def Authenticate(self):
        packet = SMB2Packet()
        if self.GetNegotiateResponse()['DialectRevision'] >= SMB2_DIALECT_30:
            packet = SMB3Packet()
        packet['Command'] = SMB2_SESSION_SETUP

        if self._answer.isValidAnswer(STATUS_MORE_PROCESSING_REQUIRED):
            self._sessionId = self._answer['SessionID']
            type3, _ = ntlm.getNTLMSSPType3(self._auth, self._respToken['ResponseToken'], '', '', '', '', '')

            respToken2 = SPNEGO_NegTokenResp()
            respToken2['ResponseToken'] = type3.getData()

            sessionSetup = SMB2SessionSetup()
            sessionSetup['SecurityMode'] = SMB2_NEGOTIATE_SIGNING_ENABLED
            sessionSetup['SecurityBufferLength'] = len(respToken2)
            sessionSetup['Buffer'] = respToken2.getData()
            packet['Data'] = sessionSetup

            self.send(packet)
            packet = self.receive()

            try:
                return packet.isValidAnswer(STATUS_SUCCESS)
            except:
                return False

    def send(self, packet):
        packet['MessageID'] = self._sequenceWindow
        self._sequenceWindow += 1

        packet['SessionID'] = self._sessionId
        packet['CreditCharge'] = 1
        messageId = packet['MessageID']
        data = packet.getData()
        self._NetBIOSSession.send_packet(data)

        return messageId

    def receive(self):
        data = self._NetBIOSSession.recv_packet(self._timeout)
        packet = SMB2Packet(data.get_trailer())
        return packet

    def _negotiateSession(self, negSessionResponse = None):
        currentDialect = SMB2_DIALECT_WILDCARD
        if negSessionResponse is not None:
            negotiateResponse = SMB2Negotiate_Response(negSessionResponse['Data'])
            currentDialect = negotiateResponse['DialectRevision']

        if currentDialect == SMB2_DIALECT_WILDCARD:
            packet = SMB2Packet()
            packet['Command'] = SMB2_NEGOTIATE
            negSession = SMB2Negotiate()
            negSession['SecurityMode'] = SMB2_NEGOTIATE_SIGNING_ENABLED
            negSession['Capabilities'] = SMB2_GLOBAL_CAP_ENCRYPTION
            negSession['ClientGuid'] = ''.join([random.choice(string.ascii_letters) for _ in range(16)])
            negSession['Dialects'] = [SMB2_DIALECT_002, SMB2_DIALECT_21, SMB2_DIALECT_30]
            negSession['DialectCount'] = len(negSession['Dialects'])
            packet['Data'] = negSession

            self.send(packet)
            answer = self.receive()
            if answer.isValidAnswer(STATUS_SUCCESS):
                negotiateResponse = SMB2Negotiate_Response(answer['Data'])

        return negotiateResponse

    def _createSessionSetupRequest(self, dialect):
        sessionSetup = SMB2SessionSetup()
        sessionSetup['Flags'] = 0

        blob = SPNEGO_NegTokenInit()
        blob['MechTypes'] = [TypesMech['NTLMSSP - Microsoft NTLM Security Support Provider']]

        self._auth = ntlm.getNTLMSSPType1('', '', False)
        blob['MechToken'] = self._auth.getData()

        sessionSetup['SecurityBufferLength'] = len(blob)
        sessionSetup['Buffer']               = blob.getData()

        packet = SMB2Packet()
        if dialect >= SMB2_DIALECT_30:
            packet = SMB3Packet()
        packet['Command'] = SMB2_SESSION_SETUP
        packet['Data']    = sessionSetup

        return packet


class SmbConnection:
    def __init__(self, ip, hostname, port) -> None:
        self.target      = ip
        self.hostname    = hostname
        self._sess_port  = int(port)
        self._timeout    = 60
        self._myName     = self._get_my_name()
        self._nmbSession = None
        self._SMBConnection = None

    def IsSmb1Enabled(self):
        flags1 = SMB.FLAGS1_PATHCASELESS | SMB.FLAGS1_CANONICALIZED_PATHS
        flags2 = SMB.FLAGS2_EXTENDED_SECURITY | SMB.FLAGS2_NT_STATUS | SMB.FLAGS2_LONG_NAMES
        smbv1NegoData = '\x02NT LM 0.12\x00'
        smb1_enabled = False
        try:
            self._negotiateSessionWildcard(True, flags1=flags1, flags2=flags2, data=smbv1NegoData)
        except Exception as e:
            if 'No answer!' in str(e):
                smb1_enabled = False
        else:
            smb1_enabled = True
        return smb1_enabled

    def NegotiateSession(self):
        flags1 = SMB.FLAGS1_PATHCASELESS | SMB.FLAGS1_CANONICALIZED_PATHS
        flags2 = SMB.FLAGS2_EXTENDED_SECURITY | SMB.FLAGS2_NT_STATUS | SMB.FLAGS2_LONG_NAMES

        negoData = '\x02NT LM 0.12\x00\x02SMB 2.002\x00\x02SMB 2.???\x00'
        if self._sess_port == nmb.NETBIOS_SESSION_PORT:
            negoData = '\x02NT LM 0.12\x00\x02SMB 2.002\x00'

        packet = self._negotiateSessionWildcard(True, flags1=flags1, flags2=flags2, data=negoData)

        if packet[0:1] == b'\xfe':
            self._SMBConnection = SMB3(self.hostname, self.target, self._myName, self._sess_port, 
                                        self._timeout, session=self._nmbSession, negSessionResponse=SMB2Packet(packet))
        else:
            self._SMBConnection = SMB1(self.hostname, self.target, self._myName, self._sess_port, 
                                        self._timeout, session=self._nmbSession, negSessionResponse=packet)
        return self._SMBConnection.GetNegotiateResponse()

    def GetChallange(self):
        return self._SMBConnection.GetChallange()

    def Authenticate(self):
        return self._SMBConnection.Authenticate()

    def _negotiateSessionWildcard(self, extended_security=True, flags1=0, flags2=0, data=None):
        tries = 0
        smbp = NewSMBPacket()
        smbp['Flags1'] = flags1
        smbp['Flags2'] = flags2 | SMB.FLAGS2_UNICODE
        response = None
        while tries < 2:
            self._nmbSession = nmb.NetBIOSTCPSession(self._myName, self.hostname, self.target, nmb.TYPE_SERVER, self._sess_port, self._timeout)
            negSession = SMBCommand(SMB.SMB_COM_NEGOTIATE)
            if extended_security is True:
                smbp['Flags2'] |= SMB.FLAGS2_EXTENDED_SECURITY
            negSession['Data'] = data
            smbp.addCommand(negSession)
            self._nmbSession.send_packet(smbp.getData())

            try:
                response = self._nmbSession.recv_packet(self._timeout)
                break
            except nmb.NetBIOSError:
                smbp['Flags2'] |= SMB.FLAGS2_NT_STATUS | SMB.FLAGS2_LONG_NAMES | SMB.FLAGS2_UNICODE
                smbp['Data'] = []

            tries += 1

        if response is None:
            raise Exception('No answer!')

        return response.get_trailer()

    def _get_my_name(self):
        myName = socket.gethostname()
        i = myName.find('.')
        if i > -1:
            myName = myName[:i]
        return myName


class DumpNtlm:
    def __init__(self, ip, hostname, port, protocol) -> None:
        self.target     = ip
        self.hostname   = hostname
        self._sess_port = int(port)
        self._protocol  = protocol
        self._timeout   = 60

    def DisplayInfo(self):
        if self._protocol == 'SMB':
            self.DisplaySmbInfo()
        elif self._protocol == 'RPC':
            self.DisplayRpcInfo()

    def DisplayRpcInfo(self):
        rpc = RPC(self.target)

        ntlmChallenge = rpc.GetChallange()
        self.DisplayChallangeInfo(ntlmChallenge)

        self.DisplayIo({'MaxReadSize': rpc.MaxTrasmitionSize, 'MaxWriteSize': rpc.MaxTrasmitionSize})

    def DisplaySmbInfo(self):
        connection = SmbConnection(self.target, self.hostname, self._sess_port)

        negotiation = connection.NegotiateSession()
        dialect = negotiation['DialectRevision']
        secMode = negotiation['SecurityMode']

        smb1_enabled = connection.IsSmb1Enabled()

        self.DisplayDialect(dialect, smb1_enabled)
        self.DisplaySigning(secMode)
        self.DisplayIo(negotiation)
        self.DisplayTime(negotiation)

        ntlmChallenge = connection.GetChallange()
        self.DisplayChallangeInfo(ntlmChallenge)

        nullSession = connection.Authenticate()
        self.DisplayNullSession(nullSession)


    def DisplaySigning(self, secMode):
        mode = ''
        if (secMode & SMB2_NEGOTIATE_SIGNING_ENABLED) == SMB2_NEGOTIATE_SIGNING_ENABLED:
            mode = 'SIGNING_ENABLED'
        if (secMode & SMB2_NEGOTIATE_SIGNING_REQUIRED) == SMB2_NEGOTIATE_SIGNING_REQUIRED:
            mode += ' | SIGNING_REQUIRED'
        else:
            mode += ' (not required)'
        print("[+] Server Security : {}".format(mode))


    def DisplayDialect(self, dialect, smb1_enabled):
        print("[+] SMBv1 Enabled   : {0}".format(smb1_enabled))
        if dialect == SMB2_DIALECT_002:
            print("[+] Prefered Dialect: SMB 002")
        elif dialect == SMB2_DIALECT_21:
            print("[+] Prefered Dialect: SMB 2.1")
        elif dialect == SMB2_DIALECT_30:
            print("[+] Prefered Dialect: SMB 3.0")
        elif dialect == SMB2_DIALECT_302:
            print("[+] Prefered Dialect: SMB 3.0.2")
        elif dialect == SMB2_DIALECT_302:
            print("[+] Prefered Dialect: SMB 3.0.2")
        elif dialect == SMB2_DIALECT_311:
            print("[+] Prefered Dialect: SMB 3.1.1")
        elif type(dialect) is str:
            print("[+] Prefered Dialect: {}".format(dialect)) # SMB1
        else:
            print("[+] Prefered Dialect: 0x{:x}".format(dialect))


    def DisplayIo(self, negotiateResponse):
        print("[+] Max Read Size   : {} ({} bytes)".format(self.__convert_size(negotiateResponse['MaxReadSize']), negotiateResponse['MaxReadSize']))
        print("[+] Max Write Size  : {} ({} bytes)".format(self.__convert_size(negotiateResponse['MaxWriteSize']), negotiateResponse['MaxWriteSize']))


    def DisplayTime(self, negotiateResponse):
        currentTime = 0 if negotiateResponse['SystemTime'] == 0 else self.__filetime_to_dt(negotiateResponse['SystemTime']).astimezone(timezone.utc)
        bootTime    = 0 if negotiateResponse['ServerStartTime'] == 0 else self.__filetime_to_dt(negotiateResponse['ServerStartTime']).astimezone(timezone.utc)
        print("[+] Current Time    : {}".format(currentTime))
        if bootTime != 0:
            print("[+] Boot Time       : {}".format(bootTime))
            print("[+] Server Up Time  : {}".format(currentTime - bootTime))


    def DisplayChallangeInfo(self, challange):
        if challange['TargetInfoFields_len'] > 0:
            av_pairs = ntlm.AV_PAIRS(challange['TargetInfoFields'][:challange['TargetInfoFields_len']])
            if av_pairs[ntlm.NTLMSSP_AV_HOSTNAME] is not None:
                try:
                    print("[+] Name            : {}".format(av_pairs[ntlm.NTLMSSP_AV_HOSTNAME][1].decode('utf-16le')))
                except:
                    pass
            if av_pairs[ntlm.NTLMSSP_AV_DOMAINNAME] is not None:
                try:
                    print("[+] Domain          : {}".format(av_pairs[ntlm.NTLMSSP_AV_DOMAINNAME][1].decode('utf-16le')))
                except:
                    pass
            if av_pairs[ntlm.NTLMSSP_AV_DNS_TREENAME] is not None:
                try:
                    print("[+] DNS Tree Name   : {}".format(av_pairs[ntlm.NTLMSSP_AV_DNS_TREENAME][1].decode('utf-16le')))
                except:
                    pass
            if av_pairs[ntlm.NTLMSSP_AV_DNS_DOMAINNAME] is not None:
                try:
                    print("[+] DNS Domain Name : {}".format(av_pairs[ntlm.NTLMSSP_AV_DNS_DOMAINNAME][1].decode('utf-16le')))
                except:
                    pass
            if av_pairs[ntlm.NTLMSSP_AV_DNS_HOSTNAME] is not None:
                try:
                    print("[+] DNS Host Name   : {}".format(av_pairs[ntlm.NTLMSSP_AV_DNS_HOSTNAME][1].decode('utf-16le')))
                except:
                    pass
            # if av_pairs[ntlm.NTLMSSP_AV_TIME] is not None:
            #     try:
            #         timelong = struct.unpack('<q', av_pairs[ntlm.NTLMSSP_AV_TIME][1])[0]
            #         print("[+] Time            : {}".format(self.__filetime_to_dt(timelong).astimezone(timezone.utc)))
            #     except:
            #         pass
            if 'Version' in challange.fields:
                version = challange['Version']
                if len(version) >= 4:
                    print("[+] OS              : {}".format("Windows NT %d.%d Build %d" % (indexbytes(version,0), indexbytes(version,1), struct.unpack('<H',version[2:4])[0])))


    def DisplayNullSession(self, nullSession):
        print("[+] Null Session    : {}".format(nullSession))

    # https://stackoverflow.com/questions/38878647/python-convert-filetime-to-datetime-for-dates-before-1970
    def __filetime_to_dt(self, filetime):
        us = (filetime - EPOCH_AS_FILETIME) // 10
        return datetime(1970, 1, 1) + timedelta(microseconds = us)


    # https://stackoverflow.com/questions/5194057/better-way-to-convert-file-sizes-in-python
    def __convert_size(self, size_bytes):
        if size_bytes == 0:
            return "0B"
        size_name = ("B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB")
        i = int(math.floor(math.log(size_bytes, 1024)))
        p = math.pow(1024, i)
        s = round(size_bytes / p, 2)
        return "%s %s" % (s, size_name[i])


if __name__ == '__main__':

    print(version.BANNER)
    logger.init()

    parser = argparse.ArgumentParser(add_help = True, description = "Do ntlm authentication and parse information.")
    parser.add_argument('target', action='store', help='<targetName or address>')
    parser.add_argument('-debug', action='store_true', help='Turn DEBUG output ON')
    parser.add_argument('-target-ip', action='store', metavar="ip address",
                       help='IP Address of the target machine. If omitted it will use whatever was specified as target. '
                            'This is useful when target is the NetBIOS name and you cannot resolve it')
    parser.add_argument('-port', type=int, default=445, metavar="destination port",
                    help='Destination port to connect to SMB/RPC Server')
    parser.add_argument('-protocol', choices=['SMB', 'RPC'], nargs='?', metavar="protocol",
                        help='Protocol to use (SMB or RPC). Default is SMB, port 135 uses RPC normally.')

    if len(sys.argv) == 1:
        parser.print_help()
        sys.exit(1)

    options = parser.parse_args()

    if options.port == 135:
        if not options.protocol:
            options.protocol = 'RPC'
            logging.info("Port 135 specified; using RPC protocol by default. Use `-protocol SMB` to force SMB protocol.")
        elif options.protocol == 'SMB':
            logging.info("Port 135 specified with SMB protocol. Are you sure you don't want `-protocol RPC`?")
    elif not options.protocol:
        options.protocol = 'SMB'
        logging.info("Defaulting to SMB protocol.")

    if options.debug is True:
        logging.getLogger().setLevel(logging.DEBUG)
        logging.debug(version.getInstallationPath())
    else:
        logging.getLogger().setLevel(logging.INFO)

    try:
        if options.target_ip is not None:
            dumper = DumpNtlm(options.target_ip, options.target, int(options.port), options.protocol)
        else:
            dumper = DumpNtlm(options.target, options.target, int(options.port), options.protocol)
        logging.info("Using target: %s, IP: %s, Port: %d, Protocol: %s" % (options.target, options.target_ip or options.target, options.port, options.protocol) )
        dumper.DisplayInfo()
    except Exception as e:
        if logging.getLogger().level == logging.DEBUG:
            import traceback
            traceback.print_exc()
        logging.error(str(e))