ikeclient.py

#IKEForce
#Created by Daniel Turner
#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 socket,OpenSSL,sys,struct
try:
        import udp
except:
        print "Missing 'udp' library: install it with 'pip install pyip' then run again.\nExiting..."
        exit()
import array
import dh
# import ikecrypto

#IKE/ISAKMP client classes
###***get rid of this
port = 500

class IKEv1Client(object):
    #List some protocol processing values, reserved space and some others omitted
    dicPayloads = {'0':'NONE','1':'Security Association (SA)','2':'Proposal (P)','3':'Transform (T)','4':'Key Exchange (KE)','5':'Identification (ID)','6':'Certificate (CERT)','7':'Certificate Request (CR)','8':'Hash (HASH)','9':'Signature (SIG)','10':'Nonce (NONCE)','11':'Notification (N)','12':'Delete (D)','13':'Vendor ID (VID)','14':'Mode CFG Attributes','15':'SA KEK Payload (SAK)','16':'SA TEK Payload (SAT)','17':'Key Download (KD)','18':'Sequence Number (SEQ)','19':'Proof of Possession (POP)','20':'NAT Discovery (NAT-D)','21':'NAT Original Address (NAT-OA)','22':'Group Associated Policy (GAP)','23-127':'Unassigned','130':'NAT-D','128-255':'Reserved for private use'}
    dicXTypes = {'0':'NONE','1':'Base','2':'Identity Protection','3':'Authentication Only','4':'Aggressive','5':'Informational','6':'Transaction (MODE-CFG)','32':'Quick Mode (QM)','33':'New Group Mode (NGM)'}
    dicAtts = {'1':'Encryption Algorithm','2':'Hash Algorithm','3':'Authentication Method','4':'Group Description','5':'Group Type','6':'Group Prime/Irreducible Polynomial','7':'Group Generator One','8':'Group Generator Two','9':'Group Curve A','10':'Group Curve B','11':'Life Type','12':'Life Duration','13':'PRF','14':'Key Length','15':'Field Size','16':'Group Order','17-16383':'Unassigned','16384-32767':'Reserved'}
    dicEType = {'1':'DES-CBC','2':'IDEA-CBC','3':'Blowfish-CBC','4':'RC5-R16-B64-CBC','5':'3DES-CBC','6':'CAST-CBC','7':'AES-CBC','8':'CAMELLIA-CBC'}
    dicAType = {'1':'PSK','2':'DSS-Sig','3':'RSA-Sig','4':'RSA-Enc','5':'Revised RSA-Enc','64221':'Hybrid Mode','65001':'XAUTHInitPreShared'}
    dicHType = {'1':'MD5','2':'SHA','3':'Tiger','4':'SHA2-256','5':'SHA2-384','6':'SHA2-512'}
    dicDHGroup = {'1':'default 768-bit MODP group','2':'alternate 1024-bit MODP group','3':'EC2N group on GP[2^155]','4':'EC2N group on GP[2^185]','5':'1536-bit MODP group','6':'EC2N group over GF[2^163](see Note)','7':'EC2N group over GF[2^163](see Note)','8':'EC2N group over GF[2^283](see Note)','9':'EC2N group over GF[2^283](see Note)','10':'EC2N group over GF[2^409](see Note)','11':'EC2N group over GF[2^409](see Note)','12':'EC2N group over GF[2^571](see Note)','13':'EC2N group over GF[2^571](see Note)','14':'2048-bit MODP group','15':'3072-bit MODP group','16':'4096-bit MODP group','17':'6144-bit MODP group','18':'8192-bit MODP group','19':'256-bit random ECP group','20':'384-bit random ECP group','21':'521-bit random ECP group','22':'1024-bit MODP Group with 160-bit Prime Order Subgroup','23':'2048-bit MODP Group with 224-bit Prime Order Subgroup','24':'2048-bit MODP Group with 256-bit Prime Order Subgroup','25':'192-bit Random ECP Group','26':'224-bit Random ECP Group','27':'224-bit Brainpool ECP group','28':'256-bit Brainpool ECP group','29':'384-bit Brainpool ECP group','30':'512-bit Brainpool ECP group'}
    dicLType = {'1':'seconds','2':'kilobytes'}
    dicMCFGType = {'0':'RESERVED','1':'ISAKMP_CFG_REQUEST','2':'ISAKMP_CFG_REPLY','3':'ISAKMP_CFG_SET','4':'ISAKMP_CFG_ACK','5-127':'Reserved for Future Use','128-255':'Reserved for Private Use'}
    dicMCFGAtt = {'0':'RESERVED','1':'INTERNAL_IP4_ADDRESS','2':'INTERNAL_IP4_NETMASK','3':'INTERNAL_IP4_DNS','4':'INTERNAL_IP4_NBNS','5':'INTERNAL_ADDRESS_EXPIRY','6':'INTERNAL_IP4_DHCP','7':'APPLICATION_VERSION','13':'INTERNAL_IP4_SUBNET','14':'SUPPORTED_ATTRIBUTES'}#missing ipv6 values
    dicXAUTHAtts = {'16520':'XAUTH_TYPE','16521':'XAUTH_USER_NAME','16522':'XAUTH_USER_PASSWORD','16523':'XAUTH_PASSCODE','16524':'XAUTH_MESSAGE','16525':'XAUTH_CHALLENGE','16526': 'XAUTH_DOMAIN','16527':'XAUTH_STATUS'}
    dicXAUTHTypes = {'0':'Generic','1':'RADIUS-CHAP','2':'OTP','3':'S/KEY','4-32767':'Reserved for future use','32768-65535':'Reserved for private use'}
    dicNotType = {'1':'INVALID-PAYLOAD-TYPE','2':'DOI-NOT-SUPPORTED','3':'SITUATION-NOT-SUPPORTED','4':'INVALID-COOKIE','5':'INVALID-MAJOR-VERSION','6':'INVALID-MINOR-VERSION','7':'INVALID-EXCHANGE-TYPE','8':'INVALID-FLAGS','9':'INVALID-MESSAGE-ID','10':'INVALID-PROTOCOL-ID','11':'INVALID-SPI','12':'INVALID-TRANSFORM-ID','13':'ATTRIBUTES-NOT-SUPPORTED','14':'NO-PROPOSAL-CHOSEN','15':'BAD-PROPOSAL-SYNTAX','16':'PAYLOAD-MALFORMED','17':'INVALID-KEY-INFORMATION','18':'INVALID-ID-INFORMATION','19':'INVALID-CERT-ENCODING','20':'INVALID-CERTIFICATE','21':'CERT-TYPE-UNSUPPORTED','22':'INVALID-CERT-AUTHORITY','23':'INVALID-HASH-INFORMATION','24':'AUTHENTICATION-FAILED','25':'INVALID-SIGNATURE','26':'ADDRESS-NOTIFICATION','27':'NOTIFY-SA-LIFETIME','28':'CERTIFICATE-UNAVAILABLE','29':'UNSUPPORTED-EXCHANGE-TYPE','30':'UNEQUAL-PAYLOAD-LENGTHS','36136':'R-U-THERE','36137':'R-U-THERE-ACK'}
    dicCertType = {'0':'NONE','1':'PKCS7 wrapped X.509 certificate','2':'PGP Certificate','3':'DNS Signed Key','4':'X.509 Certificate - Signature','5':'X.509 Certificate - Key Exchange','6':'Kerberos Tokens','7':'Certificate Revocation List CRL','8':'Authority Revocation List ARL','9':'SPKI Certificate','10':'X.509 Certificate - Attribute'}

    def __init__(self,debug):
	self.debug = debug


    def secRandom(self, bytes):
	#Creates selected number of random bytes
	#Provide the number of bytes required as input, method will return raw bytes
	randomBytes = OpenSSL.rand.bytes(bytes)
	return randomBytes

    def payBuild(self, strPayload, lenLen, *arg):
        #Payload length calculation, returns the full payload with the length calculated and included
	#Provide payload in hex string format, size of length bytes for the payload and any sub payloads as an additional (optional) single argument 
	try:
		#Calculating payload with sub-payloads length
		if arg[0] and lenLen <= 2:
                	wholePayload = strPayload + arg[0]
                	payLen = hex(len(wholePayload)/2+lenLen)[2:].zfill(lenLen*2)#+2 for the length payload
                	if self.debug > 0:
                	        print "Calculating length"
                	        print "Payload Length:  %s"%payLen
                	strPayload = wholePayload[:4]+payLen+wholePayload[4:]
                	arrayPayload = array.array('B', (strPayload).decode("hex"))
		else:
			#Calculating payload length with larger space used for length bytes (currently this only covers the header paylod, it may break if used for other payloads as the length goes in at the 24th byte)
			wholePayload = strPayload + arg[0]
			payLen = hex(len(wholePayload)/2+lenLen)[2:].zfill(lenLen*2)#+4 for the length payload
			if self.debug > 0:
				print "Calculating length"
				print "Payload Length:  %s"%payLen
			strPayload = wholePayload[:48]+payLen+wholePayload[48:]
			arrayPayload = array.array('B', (strPayload).decode("hex"))


	except:
		#Calculating payload's length with no sub-payload
		if lenLen <= 2:
	                payLen = hex(len(strPayload)/2+lenLen)[2:].zfill(lenLen*2)#+2 for the length payload itself
	                if self.debug > 0:
	                        print "Calculating length"
	                        print "Payload Length:  %s"%payLen
	                strPayload = strPayload[:4]+payLen+strPayload[4:]
	                arrayPayload = array.array('B', (strPayload).decode("hex"))

		else:		
			#Calculating payload length with larger space used for length bytes (currently this only covers the header paylod, it may break if used for other payloads as the length goes in at the 24th byte)
			payLen = hex(len(strPayload)/2+lenLen)[2:].zfill(lenLen*2)#+4 for the length payload itself
                	if self.debug > 0:
                	        print "Calculating length"
                	        print "Payload Length:  %s"%payLen
			strPayload = strPayload[:48]+payLen+strPayload[48:]
			arrayPayload = array.array('B', (strPayload).decode("hex"))

	return arrayPayload

    def payPack(self, arrayPayload):
        lenPayload = len(arrayPayload)
        bytesPayload = struct.pack(("B"*lenPayload),*arrayPayload)
	return bytesPayload

    def ikeHeader(self,payNext,iCookie,rCookie,version,flags,xType,msgID,payloads): #Input the payload length to this method for now, need to figure out a calculation for this later
        #Build the IKE Header
	#Provide next payload, initiator cookie, responder cookie, flags, exchange type, and the full following payloads which will be returned as an array of the full packet
        version = '10'
	strPayload = iCookie+rCookie+payNext+version+xType+flags+msgID
	arrayPayload = self.payBuild(strPayload, 4, payloads)

	if self.debug > 0:
                print "Processing IKE Header:"
                print "iCookie: %s"%iCookie
                print "rCookie: %s"%rCookie
                try:
                        print "Next Payload: %s"%self.dicPayloads[str(int(payNext,16))]
                except TypeError:
                        print "Next Payload: %s"%self.dicPayloads[str(payNext)]
                print "Version: %s"%version
                print "Exchange Type: %s (%s)"%(xType,self.dicXTypes[str(int(xType, 16))])
                print "Flags: %s"%flags
                print "Message ID: %s"%msgID

	return arrayPayload
	
	
    def ikeSA(self, propPayload, *args):
	#Process SA payload
	#Provide the full proposal payload as the required agrument
	if len(args) > 0:
		payNext = args[0]
	else:
		payNext = "04"
	padding = "00" #padding here (reserved space)
        doi = "00000001"
        sit = "00000001"

        strPayload = payNext+padding+doi+sit
	arrayPacket = self.payBuild(strPayload,2,propPayload)

        if self.debug > 0:
                print "Processing SA payload:"
                print "Next Payload: %s"%self.dicPayloads[str(int(payNext,16))]
                print "Domain of Interpretation: %s"%doi
                print "Situation: %s"%sit
        return arrayPacket


    def ikeProposal(self, strTransforms, payNext, phase):
	#Process IKE proposal payload
	if phase == 1:
		padding = "00"#padding (reserved space)
		payLen = "0000"
		propNum = "01"
		protID = "01"
		spiSize = "00"
		propTrans = "01"
	elif phase == 2:
                padding = "00"#padding (reserved space)
                payLen = "0000"
                propNum = "01"
                protID = "03"
                spiSize = "04"
                propTrans = "01"
		spi = self.secRandom(4).encode('hex')
	
	try:
		strPayload = payNext+padding+propNum+protID+spiSize+propTrans+spi
	except:
		strPayload = payNext+padding+propNum+protID+spiSize+propTrans

	arrayPacket = self.payBuild(strPayload,2,strTransforms)

        if self.debug > 0:
                print "Processing Proposal:"
                print "Next Payload: %s"%self.dicPayloads[str(int(payNext,16))]
                print "Payload Length: %s"%len(arrayPacket)
                print "SPI Size: %s"%spiSize
                print "Proposal Transforms: %s"%int(propTrans,16) #just one transform set for now
		try:
			print "SPI: %s"%spi
		except:
			pass

	return arrayPacket
 

    def ikeTransform(self,et,ht,at,gd,lt_,ld,transID,phase,payNext,*arg):
	#Takes arguments, 6 transform attributes (encryption algorithm, hash algorithm, authentication type, Dh group number, life type, life duration) along with a transform ID number, which phase (1 or 2) and an option key length argument
	#Check if key length is specified
	if arg:
		keyLen = int(arg[0]*8)
		keyLen = "800e" + str(hex(keyLen)[2:]).zfill(4)
	else:
		pass
	#Transform header
	padding = "00" #padding (reserved space)
	transNum = "01"
	padding1 = "0000" #more padding

	if phase == 1:
		#Build phase 1 Transform payload
		try:
			encType = "800100" + str(et)
	        except: 
	                for i in self.dicHType:
	                        if self.dicHType[str(i)] == et.upper():
	                                et = i.zfill(2)
	                encType = "800200" + et
		try:
		        hashType = "800200" + int(ht).zfill(2)
		except:
			for i in self.dicHType:
				if self.dicHType[str(i)] == ht.upper():
					ht = i.zfill(2)
			hashType = "800200" + ht
		authType = "8003" + str(at)# + "8003" + "FDE9"
	
		groupType = "800400" + str(gd)
		lifeType = "800b00" + str(lt_)
		lifeDur = "000c0004" + str(ld) # need to handle this better

        	try:
        	        strPayload = payNext+padding+transNum+transID+padding1+encType+hashType+authType+groupType+lifeType+lifeDur+keyLen
        	except:
        	        strPayload = payNext+padding+transNum+transID+padding1+encType+hashType+authType+groupType+lifeType+lifeDur

	elif phase == 2:
		#Build phase 2 transform set
		#***static values for now, this will need to be ammended later
		print "Building Phase 2 Transform set"
		encMode = "80040001"#80040001 - encapsulation mode tunnel
		authAlg = "800500" + ht
		keyLen = "80060100" #- key length 128
		lifeDur = "000200040020c49b" #- life duration 2147483
		
		strPayload = payNext+padding+transNum+transID+padding1+encMode+authAlg+keyLen+lifeDur

	arrayPacket = self.payBuild(strPayload,2)

	if self.debug > 0:
                print "Processing Transform payload:"
                try:   
                        print "Next Payload: %s"%self.dicPayloads[str(int(payNext,16))]
                except TypeError:
       	        	print "Next Payload: %s"%self.dicPayloads[str(payNext)]
        		print "Transform Number: %s"%transNum
        	        print "Encryption Type: %s"%encType
			print "Hash Type: %s"%hashType
			print "Auth Type: %s"%authType
			print "DHGroup Type: %s"%groupType
			print "Life Type: %s"%lifeType
			print "Life Duration: %s"%lifeDur
		try:
			print "Key Length: %s"%keyLen
		except:
			pass
	return arrayPacket


    def ikeKE(self, pubKey):
	payNext = "0a" #(Nonce)
	padding = "00" # padding (reserved space)
	strPayload = payNext+padding+pubKey
	arrayPacket = self.payBuild(strPayload,2)


        if self.debug > 0:
                print "Processing KE payload:"
                try:   
                        print "Next Payload: %s"%self.dicPayloads[str(int(payNext,16))]
                except TypeError:
                        print "Next Payload: %s"%self.dicPayloads[str(payNext)]
                print "KE Payload: %s\n"%pubKey
	return arrayPacket

    def ikeNonce(self, *arg):
	#Process Nonce payload
	#Provide the next payload as argument returns array and the nonce data separately
	if len(arg) > 0:
		payNext = arg[0]
	else:
		payNext = "05"
	padding = "00" #reserved space
	###***probably need to increase the nonce size in the below line with alternative algorithms?
	nonce = self.secRandom(20).encode('hex')
	strPayload = payNext+padding+nonce
	arrayPacket = self.payBuild(strPayload, 2)

        if self.debug > 0:
                print "Processing Nonce payload:"
                try:   
                        print "Next Payload: %s"%self.dicPayloads[str(int(payNext,16))]
                except TypeError:
                        print "Next Payload: %s"%self.dicPayloads[str(payNext)]
                print "Nonce Payload: %s\n"%nonce

	return arrayPacket,nonce

    def ikeID(self, idData, idType, port, protID, payNext):
	#Processing IKE ID payload
	#Provide string ID, ID type, port, protocol ID and next payload as arguments. Returns array of the whole payload and the ID for crypto usage
	padding = "00" #padding (reserved space)
        if idType == "03" or idType =="02":
                idData = idData.encode('hex')
        else:
                pass

	strPayload = payNext+padding+idType+protID+port+idData
	arrayPacket = self.payBuild(strPayload, 2)

        if self.debug > 0:
                print "Processing Identification Payload:"
                try:   
                        print "Next Payload: %s"%self.dicPayloads[str(int(payNext,16))]
                except TypeError:
                        print "Next Payload: %s"%self.dicPayloads[str(payNext)]
                print "ID Type: %s"%idType
                print "Group ID: %s"%idData

	ID_i = strPayload[4:]
	return arrayPacket,ID_i

    def ikeHash(self,payNext,hash):
	padding = "00"
	strPayload = payNext+padding+hash
	arrayPacket = self.payBuild(strPayload, 2)

        if self.debug > 0:
                print "Processing Hash Payload:"
                try:   
                        print "Next Payload: %s"%self.dicPayloads[str(int(payNext,16))]
                except TypeError:
                        print "Next Payload: %s"%self.dicPayloads[str(payNext)]
		
	return arrayPacket
	
    def ikeNot(self,payNext,msgType,spi,notData):
	padding = "00"
	doi = "00000001"
        protID = "01"
	spiSize = str(hex(len(spi)/2))[2:].zfill(2)
	try:
		strPayload = payNext+padding+doi+protID+spiSize+msgType+spi+notData
	except TypeError:
		msgType = hex(msgType)[2:].zfill(4)
		strPayload = payNext+padding+doi+protID+spiSize+msgType+spi+notData

	arrayPacket = self.payBuild(strPayload, 2)

        if self.debug > 0:
                print "Processing Notification Payload:"
                try:
                        print "Next Payload: %s"%self.dicPayloads[str(int(payNext,16))]
                except TypeError:
                        print "Next Payload: %s"%self.dicPayloads[str(payNext)]
		print "DOI: %s"%doi
		print "Protocol ID: %s"%protID
		print "SPI Size: %s"%spiSize
                try:
                        print "Notify Message Type: %s"%self.dicNotType[str(int(msgType,16))]
                except: 
                        print "Notify Message Type: %s (Unknown Type)"%int(msgType,16)
                print "Notification Data: %s\n"%notData

        return arrayPacket

    def ikeVID(self,payNext,VIDdata):
	#Provide the next payload number and VID data
	#Returns an array of the payload
        padding = "00"
        try:   
                payNext = hex(payNext)[2:].zfill(2)
                strPayload = payNext+padding+hash

        except:
                strPayload = payNext+padding+VIDdata

	arrayPacket = self.payBuild(strPayload, 2)

        if self.debug > 0:
                print "Processing VID Payload:"
                try:
                        print "Next Payload: %s"%self.dicPayloads[str(int(payNext,16))]
                except TypeError:
                        print "Next Payload: %s"%self.dicPayloads[str(payNext)]
                print "VID Data: %s\n"%VIDdata

	return arrayPacket 

    def ikeXAUTH(self,typeXAUTH,attXAUTH,attXAUTHValue,*args):
	#Provide xauth type integer and xauth attribute and value as strings
	#if cisco change 4080 to c080
	padding = "0000"
	if len(args) > 1:
		print "Only 1 optional argument (vendor) required if responder is Cisco. Exiting..."
		exit()
	try:
	        attXAUTH = int(attXAUTH,16)
        except:
		pass
	if attXAUTH == 16527 or attXAUTH == 16520:
        	#no variable length for status or type attributes
        	if self.debug > 0:
        		print "Mode Config Attribute Type: %s"%self.dicXAUTHAtts[str(attXAUTH)]
        		print "Mode Config Attribute Value: %s"%attXAUTHValue
		try:
			payloadXAUTH = hex(attXAUTH)[2:].zfill(4)+hex(attXAUTHValue)[2:].zfill(4)
		except:
			payloadXAUTH = hex(attXAUTH)[2:].zfill(4)+attXAUTHValue[2:].zfill(4)
		if args and args[0] == "cisco":
			if self.debug > 0:
				print "Responder is a Cisco device"
			payloadXAUTH = "c"+payloadXAUTH[1:]
		else:
			pass

	#Some requests need to have a blank value, to request IP address etc
	elif attXAUTHValue == "blank":
		attLen = "00"
		if self.debug > 0:
			print "Mode Config Attribute Type: %s"%attXAUTH
                        print "Mode Config Attribute Length: %s"%attLen
                        print "Mode Config Attribute Value: ()"

		payloadXAUTH = hex(attXAUTH)[2:].zfill(4)+attLen
                if args and args[0] == "cisco":
                        if self.debug > 0:
                                print "Responder is a Cisco device"
                        payloadXAUTH = "c"+payloadXAUTH[1:]
		else:
			pass

        else:   
	        attLen = len(attXAUTHValue)
                if self.debug > 0:
			try:
				print "Mode Config Attribute Type: %s"%self.dicXAUTHAtts[str(attXAUTH)]
			except:
				print "Mode Config Attribute Type: %s"%attXAUTH
                	print "Mode Config Attribute Length: %s"%attLen
                	print "Mode Config Attribute Value: %s"%attXAUTHValue

		if attXAUTH == 16525:
			payloadXAUTH = hex(attXAUTH)[2:].zfill(4)+hex(6)[2:].zfill(4)+attXAUTHValue.encode('hex')
		else:
			payloadXAUTH = hex(attXAUTH)[2:].zfill(4)+hex(attLen)[2:].zfill(4)+attXAUTHValue.encode('hex')

                if args and args[0] == "cisco":
                        if self.debug > 0:
                                print "Responder is a Cisco device"
                        payloadXAUTH = "c"+payloadXAUTH[1:]
                else:
                        pass

        return payloadXAUTH


    def ikeModeCFG(self,payNext,mcfgType,mcfgAtts):
        #Process ModeCFG payload (XAUTH)
	#run ikeXAUTH first to get the mcfgAtts payload
        padding = "00"
	#Convert int to hex in case value is supplied as int
        try:
		mcfgType = hex(mcfgType)[2:].zfill(2)
	except:
		pass
        mcfgID = "0000"

	strPayload = payNext+padding+mcfgType+padding+mcfgID+mcfgAtts
	arrayPacket = self.payBuild(strPayload, 2)

        if self.debug > 0:
                print "Processing Mode Config Payload:"
                try:
                        print "Next Payload: %s"%self.dicPayloads[str(int(payNext,16))]
                except:
                        print "Next Payload: %s"%self.dicPayloads[str(payNext)]
                print "Mode Config Message Type: %s"%self.dicMCFGType[str(int(mcfgType,16))]
                print "Mode Config ID: %s\n"%mcfgID

        return arrayPacket


    def ikeDelete(self,payNext,iCookie,rCookie):
        #Provide the initiator cookie and responder cookie
        #returns an array
        padding = "00"
        payLen = "0000"
	DOI = "00000000" # zero for ISAKMP
	protID = "01"
	spi = iCookie+rCookie
	sizeSPI = hex(len(spi)/2)[2:].zfill(2)
	numSPIs = "0001" #static for now

        try:   
                payNext = hex(payNext)[2:].zfill(2)
                strPayload = payNext+padding+payLen+DOI+protID+sizeSPI+numSPIs+spi

        except:
                strPayload = payNext+padding+payLen+DOI+protID+sizeSPI+numSPIs+spi

        arrayPayload = array.array('B', strPayload.decode("hex"))
        payLen = len(arrayPayload)
        fullpayLen = hex(payLen)[2:].zfill(4)
        arraypayLen = array.array('B', fullpayLen.decode("hex"))
        arrayPacket = arrayPayload[:2]+arraypayLen+arrayPayload[4:]

        if self.debug > 0:
                print "Processing Delete Payload:"
                try:
                        print "Next Payload: %s"%self.dicPayloads[str(int(payNext,16))]
                except TypeError: 
                        print "Next Payload: %s"%self.dicPayloads[str(payNext)]
                print "Payload Length: %s"%payLen
                print "SPI: %s\n"%spi

        return arrayPacket	


    def packPacket(self,arrayBytes):
	#Pack bytes ready for sending to socket
	arrayLen = len(arrayBytes)
	packedBytes = struct.pack(("B"*arrayLen),*arrayBytes)
	return packedBytes

    def sendPacket(self,bytes,target,sport,port):
	#Build raw UPD packet to avoid duplicate port/socket issues
	udpPacket = udp.Packet()
	udpPacket.sport = sport
	udpPacket.dport = port   
	udpPacket.data = bytes
	packet = udp.assemble(udpPacket, 0)
	sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_UDP)
	sock.sendto(packet, (target, port))
	if self.debug > 0:
		print "UDP target IP: %s"%target
		print "UDP target port: %s"%port
		print "UDP source port: %s"%sport
		print "Sending: %s"%bytes.encode('hex')


    def main(self,iCookie,rCookie,eType,hashType,authType,DHGroup,IDdata,flags,target,idType,sport,keyLen):
	ikeneg = IKEv1Client(self.debug)
	#IKE initialization packet
	try:
		phase
	except:
		phase = 1
	try:
		version
	except:
		version = "10"
		
	#Process transform before proposal to get payload length and then SA
	#Tranform
	if eType == "07" or int(eType) == 7 or eType == "AES":
		arrayTrans = ikeneg.ikeTransform(eType,hashType,authType,DHGroup,"01","00007080","01",phase,"00", keyLen)#static lifetime values for now
	else:
		arrayTrans = ikeneg.ikeTransform(eType,hashType,authType,DHGroup,"01","00007080","01",phase,"00")
	bytesTrans = ikeneg.packPacket(arrayTrans)

	#Proposal
	arrayProposal = ikeneg.ikeProposal(bytesTrans.encode('hex'), "00", phase)
	bytesProposal = ikeneg.packPacket(arrayProposal)

	#SA
	arraySA = ikeneg.ikeSA(bytesProposal.encode('hex'))#+bytesTrans.encode('hex'))
	bytesSA = ikeneg.packPacket(arraySA)
	
	#Pull out the part included in crypto operations
	arraySA_i = arraySA[4:]
	SA_i = ikeneg.packPacket(arraySA_i).encode('hex')

	#Key Exchange
	ikeDH = dh.DiffieHellman(DHGroup)
	###***need to update the below line when using alternative DH groups?
	privKey = ikeDH.genPrivateKey(1024)
	pubKey = ikeDH.genPublicKey(privKey)
	hexPrivKey = '{0:x}'.format(privKey)#using new formating to deal with long
	hexPubKey = '{0:x}'.format(pubKey)
	if len(hexPubKey) % 2 != 0:
		hexPubKey = "0" + hexPubKey

	if self.debug > 0:
		print "Initiator DH Private Key: %s"%privKey
		print "Initiator DH Private Key (hex): %s"%hexPrivKey
		print "Initiator DH Public Key: %s"%pubKey
		print "Initiator DH Public Key (hex): %s"%hexPubKey

	arrayKE = ikeneg.ikeKE(hexPubKey)
	bytesKE = ikeneg.packPacket(arrayKE)

	#Nonce payload
	arrayNonce,nonce = ikeneg.ikeNonce()
	bytesNonce = ikeneg.packPacket(arrayNonce)

	#ID payload
	arrayID,ID_i = ikeneg.ikeID(IDdata,idType,"01f4","11","0d")#next payload = none (0), 01f4 = port (500) 0d = vid
	bytesID = ikeneg.packPacket(arrayID)

	#VID payload (XAuth)
	arrayVID = ikeneg.ikeVID("00","09002689dfd6b712")
	bytesVID = ikeneg.packPacket(arrayVID)

        #VID payload (DPD)
        arrayVID1 = ikeneg.ikeVID("0d","afcad71368a1f1c96b8696fc77570100")
	bytesVID1 = ikeneg.packPacket(arrayVID1)

	#Header
	payloads = bytesSA+bytesKE+bytesNonce+bytesID+bytesVID1+bytesVID
	arrayIKE = ikeneg.ikeHeader("01",iCookie,rCookie,version,flags,"04","00000000",payloads.encode('hex'))
	bytesIKE = ikeneg.packPacket(arrayIKE)

	#Send packet
	ikeneg.sendPacket(bytesIKE,target,sport,port)

	#Gather any details required for later processing of crypto etc
	dicCrypto = {"iCookie":iCookie,"rCookie":rCookie,"eType":eType,"hashType":hashType,"authType":authType,"DHGroup":DHGroup,"nonce_i":nonce,"SA_i":SA_i,"ID_i":ID_i,"privKey":privKey,"DHPubKey_i":hexPubKey}
	return dicCrypto