doTimingAttackMitigation = True import time import threading import shared import hashlib import socket import pickle import random from struct import unpack, pack import sys import string from subprocess import call # used when the API must execute an outside program from pyelliptic.openssl import OpenSSL import highlevelcrypto from addresses import * import helper_generic import helper_bitcoin import helper_inbox import helper_sent from helper_sql import * import tr #from bitmessagemain import shared.lengthOfTimeToLeaveObjectsInInventory, shared.lengthOfTimeToHoldOnToAllPubkeys, shared.maximumAgeOfAnObjectThatIAmWillingToAccept, shared.maximumAgeOfObjectsThatIAdvertiseToOthers, shared.maximumAgeOfNodesThatIAdvertiseToOthers, shared.numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer, shared.neededPubkeys # This thread is created either by the synSenderThread(for outgoing # connections) or the singleListenerThread(for incoming connectiosn). class receiveDataThread(threading.Thread): def __init__(self): threading.Thread.__init__(self) self.data = '' self.verackSent = False self.verackReceived = False def setup( self, sock, HOST, port, streamNumber, someObjectsOfWhichThisRemoteNodeIsAlreadyAware, selfInitiatedConnections): self.sock = sock self.peer = shared.Peer(HOST, port) self.streamNumber = streamNumber self.payloadLength = 0 # This is the protocol payload length thus it doesn't include the 24 byte message header self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave = {} self.selfInitiatedConnections = selfInitiatedConnections shared.connectedHostsList[ self.peer.host] = 0 # The very fact that this receiveData thread exists shows that we are connected to the remote host. Let's add it to this list so that an outgoingSynSender thread doesn't try to connect to it. self.connectionIsOrWasFullyEstablished = False # set to true after the remote node and I accept each other's version messages. This is needed to allow the user interface to accurately reflect the current number of connections. if self.streamNumber == -1: # This was an incoming connection. Send out a version message if we accept the other node's version message. self.initiatedConnection = False else: self.initiatedConnection = True self.selfInitiatedConnections[streamNumber][self] = 0 self.ackDataThatWeHaveYetToSend = [ ] # When we receive a message bound for us, we store the acknowledgement that we need to send (the ackdata) here until we are done processing all other data received from this peer. self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware = someObjectsOfWhichThisRemoteNodeIsAlreadyAware def run(self): with shared.printLock: print 'ID of the receiveDataThread is', str(id(self)) + '. The size of the shared.connectedHostsList is now', len(shared.connectedHostsList) while True: dataLen = len(self.data) try: self.data += self.sock.recv(4096) except socket.timeout: with shared.printLock: print 'Timeout occurred waiting for data from', self.peer, '. Closing receiveData thread. (ID:', str(id(self)) + ')' break except Exception as err: with shared.printLock: print 'sock.recv error. Closing receiveData thread (HOST:', self.peer, 'ID:', str(id(self)) + ').', err break # print 'Received', repr(self.data) if len(self.data) == dataLen: # If self.sock.recv returned no data: with shared.printLock: print 'Connection to', self.peer, 'closed. Closing receiveData thread. (ID:', str(id(self)) + ')' break else: self.processData() try: del self.selfInitiatedConnections[self.streamNumber][self] with shared.printLock: print 'removed self (a receiveDataThread) from selfInitiatedConnections' except: pass shared.broadcastToSendDataQueues((0, 'shutdown', self.peer)) try: del shared.connectedHostsList[self.peer.host] except Exception as err: with shared.printLock: print 'Could not delete', self.peer.host, 'from shared.connectedHostsList.', err try: del shared.numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer[ self.peer] except: pass shared.UISignalQueue.put(('updateNetworkStatusTab', 'no data')) with shared.printLock: print 'The size of the connectedHostsList is now:', len(shared.connectedHostsList) def processData(self): # if shared.verbose >= 3: # with shared.printLock: # print 'self.data is currently ', repr(self.data) # if len(self.data) < 20: # if so little of the data has arrived that we can't even unpack the payload length return if self.data[0:4] != '\xe9\xbe\xb4\xd9': if shared.verbose >= 1: with shared.printLock: print 'The magic bytes were not correct. First 40 bytes of data: ' + repr(self.data[0:40]) self.data = "" return self.payloadLength, = unpack('>L', self.data[16:20]) if len(self.data) < self.payloadLength + 24: # check if the whole message has arrived yet. return if self.data[20:24] != hashlib.sha512(self.data[24:self.payloadLength + 24]).digest()[0:4]: # test the checksum in the message. If it is correct... print 'Checksum incorrect. Clearing this message.' self.data = self.data[self.payloadLength + 24:] self.processData() return # The time we've last seen this node is obviously right now since we # just received valid data from it. So update the knownNodes list so # that other peers can be made aware of its existance. if self.initiatedConnection and self.connectionIsOrWasFullyEstablished: # The remote port is only something we should share with others if it is the remote node's incoming port (rather than some random operating-system-assigned outgoing port). shared.knownNodesLock.acquire() shared.knownNodes[self.streamNumber][self.peer] = int(time.time()) shared.knownNodesLock.release() if self.payloadLength <= 180000000: # If the size of the message is greater than 180MB, ignore it. (I get memory errors when processing messages much larger than this though it is concievable that this value will have to be lowered if some systems are less tolarant of large messages.) remoteCommand = self.data[4:16] with shared.printLock: print 'remoteCommand', repr(remoteCommand.replace('\x00', '')), ' from', self.peer if remoteCommand == 'version\x00\x00\x00\x00\x00': self.recversion(self.data[24:self.payloadLength + 24]) elif remoteCommand == 'verack\x00\x00\x00\x00\x00\x00': self.recverack() elif remoteCommand == 'addr\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished: self.recaddr(self.data[24:self.payloadLength + 24]) elif remoteCommand == 'getpubkey\x00\x00\x00' and self.connectionIsOrWasFullyEstablished: self.recgetpubkey(self.data[24:self.payloadLength + 24]) elif remoteCommand == 'pubkey\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished: self.recpubkey(self.data[24:self.payloadLength + 24]) elif remoteCommand == 'inv\x00\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished: self.recinv(self.data[24:self.payloadLength + 24]) elif remoteCommand == 'getdata\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished: self.recgetdata(self.data[24:self.payloadLength + 24]) elif remoteCommand == 'msg\x00\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished: self.recmsg(self.data[24:self.payloadLength + 24]) elif remoteCommand == 'broadcast\x00\x00\x00' and self.connectionIsOrWasFullyEstablished: self.recbroadcast(self.data[24:self.payloadLength + 24]) elif remoteCommand == 'ping\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished: self.sendpong() elif remoteCommand == 'pong\x00\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished: pass elif remoteCommand == 'alert\x00\x00\x00\x00\x00\x00\x00' and self.connectionIsOrWasFullyEstablished: pass self.data = self.data[ self.payloadLength + 24:] # take this message out and then process the next message if self.data == '': while len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) > 0: random.seed() objectHash, = random.sample( self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave, 1) if objectHash in shared.inventory: with shared.printLock: print 'Inventory (in memory) already has object listed in inv message.' del self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave[ objectHash] elif shared.isInSqlInventory(objectHash): if shared.verbose >= 3: with shared.printLock: print 'Inventory (SQL on disk) already has object listed in inv message.' del self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave[ objectHash] else: self.sendgetdata(objectHash) del self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave[ objectHash] # It is possible that the remote node doesn't respond with the object. In that case, we'll very likely get it from someone else anyway. if len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) == 0: with shared.printLock: print '(concerning', str(self.peer) + ')', 'number of objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave is now', len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) try: del shared.numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer[ self.peer] # this data structure is maintained so that we can keep track of how many total objects, across all connections, are currently outstanding. If it goes too high it can indicate that we are under attack by multiple nodes working together. except: pass break if len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) == 0: with shared.printLock: print '(concerning', str(self.peer) + ')', 'number of objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave is now', len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) try: del shared.numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer[ self.peer] # this data structure is maintained so that we can keep track of how many total objects, across all connections, are currently outstanding. If it goes too high it can indicate that we are under attack by multiple nodes working together. except: pass if len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) > 0: with shared.printLock: print '(concerning', str(self.peer) + ')', 'number of objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave is now', len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) shared.numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer[self.peer] = len( self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) # this data structure is maintained so that we can keep track of how many total objects, across all connections, are currently outstanding. If it goes too high it can indicate that we are under attack by multiple nodes working together. if len(self.ackDataThatWeHaveYetToSend) > 0: self.data = self.ackDataThatWeHaveYetToSend.pop() self.processData() def isProofOfWorkSufficient( self, data, nonceTrialsPerByte=0, payloadLengthExtraBytes=0): if nonceTrialsPerByte < shared.networkDefaultProofOfWorkNonceTrialsPerByte: nonceTrialsPerByte = shared.networkDefaultProofOfWorkNonceTrialsPerByte if payloadLengthExtraBytes < shared.networkDefaultPayloadLengthExtraBytes: payloadLengthExtraBytes = shared.networkDefaultPayloadLengthExtraBytes POW, = unpack('>Q', hashlib.sha512(hashlib.sha512(data[ :8] + hashlib.sha512(data[8:]).digest()).digest()).digest()[0:8]) # print 'POW:', POW return POW <= 2 ** 64 / ((len(data) + payloadLengthExtraBytes) * (nonceTrialsPerByte)) def sendpong(self): print 'Sending pong' try: self.sock.sendall( '\xE9\xBE\xB4\xD9\x70\x6F\x6E\x67\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xcf\x83\xe1\x35') except Exception as err: # if not 'Bad file descriptor' in err: with shared.printLock: print 'sock.sendall error:', err def recverack(self): print 'verack received' self.verackReceived = True if self.verackSent: # We have thus both sent and received a verack. self.connectionFullyEstablished() def connectionFullyEstablished(self): self.connectionIsOrWasFullyEstablished = True if not self.initiatedConnection: shared.clientHasReceivedIncomingConnections = True shared.UISignalQueue.put(('setStatusIcon', 'green')) self.sock.settimeout( 600) # We'll send out a pong every 5 minutes to make sure the connection stays alive if there has been no other traffic to send lately. shared.UISignalQueue.put(('updateNetworkStatusTab', 'no data')) remoteNodeSeenTime = shared.knownNodes[ self.streamNumber][self.peer] with shared.printLock: print 'Connection fully established with', self.peer print 'The size of the connectedHostsList is now', len(shared.connectedHostsList) print 'The length of sendDataQueues is now:', len(shared.sendDataQueues) print 'broadcasting addr from within connectionFullyEstablished function.' self.broadcastaddr([(int(time.time()), self.streamNumber, 1, self.peer.host, self.peer.port)]) # This lets all of our peers know about this new node. self.sendaddr() # This is one large addr message to this one peer. if not self.initiatedConnection and len(shared.connectedHostsList) > 200: with shared.printLock: print 'We are connected to too many people. Closing connection.' shared.broadcastToSendDataQueues((0, 'shutdown', self.peer)) return self.sendBigInv() def sendBigInv(self): # Select all hashes which are younger than two days old and in this # stream. queryreturn = sqlQuery( '''SELECT hash FROM inventory WHERE ((receivedtime>? and objecttype<>'pubkey') or (receivedtime>? and objecttype='pubkey')) and streamnumber=?''', int(time.time()) - shared.maximumAgeOfObjectsThatIAdvertiseToOthers, int(time.time()) - shared.lengthOfTimeToHoldOnToAllPubkeys, self.streamNumber) bigInvList = {} for row in queryreturn: hash, = row if hash not in self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware: bigInvList[hash] = 0 # We also have messages in our inventory in memory (which is a python # dictionary). Let's fetch those too. for hash, storedValue in shared.inventory.items(): if hash not in self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware: objectType, streamNumber, payload, receivedTime = storedValue if streamNumber == self.streamNumber and receivedTime > int(time.time()) - shared.maximumAgeOfObjectsThatIAdvertiseToOthers: bigInvList[hash] = 0 numberOfObjectsInInvMessage = 0 payload = '' # Now let us start appending all of these hashes together. They will be # sent out in a big inv message to our new peer. for hash, storedValue in bigInvList.items(): payload += hash numberOfObjectsInInvMessage += 1 if numberOfObjectsInInvMessage >= 50000: # We can only send a max of 50000 items per inv message but we may have more objects to advertise. They must be split up into multiple inv messages. self.sendinvMessageToJustThisOnePeer( numberOfObjectsInInvMessage, payload) payload = '' numberOfObjectsInInvMessage = 0 if numberOfObjectsInInvMessage > 0: self.sendinvMessageToJustThisOnePeer( numberOfObjectsInInvMessage, payload) # Self explanatory. Notice that there is also a broadcastinv function for # broadcasting invs to everyone in our stream. def sendinvMessageToJustThisOnePeer(self, numberOfObjects, payload): payload = encodeVarint(numberOfObjects) + payload headerData = '\xe9\xbe\xb4\xd9' # magic bits, slighly different from Bitcoin's magic bits. headerData += 'inv\x00\x00\x00\x00\x00\x00\x00\x00\x00' headerData += pack('>L', len(payload)) headerData += hashlib.sha512(payload).digest()[:4] with shared.printLock: print 'Sending huge inv message with', numberOfObjects, 'objects to just this one peer' try: self.sock.sendall(headerData + payload) except Exception as err: # if not 'Bad file descriptor' in err: with shared.printLock: print 'sock.sendall error:', err # We have received a broadcast message def recbroadcast(self, data): self.messageProcessingStartTime = time.time() # First we must check to make sure the proof of work is sufficient. if not self.isProofOfWorkSufficient(data): print 'Proof of work in broadcast message insufficient.' return readPosition = 8 # bypass the nonce embeddedTime, = unpack('>I', data[readPosition:readPosition + 4]) # This section is used for the transition from 32 bit time to 64 bit # time in the protocol. if embeddedTime == 0: embeddedTime, = unpack('>Q', data[readPosition:readPosition + 8]) readPosition += 8 else: readPosition += 4 if embeddedTime > (int(time.time()) + 10800): # prevent funny business print 'The embedded time in this broadcast message is more than three hours in the future. That doesn\'t make sense. Ignoring message.' return if embeddedTime < (int(time.time()) - shared.maximumAgeOfAnObjectThatIAmWillingToAccept): print 'The embedded time in this broadcast message is too old. Ignoring message.' return if len(data) < 180: print 'The payload length of this broadcast packet is unreasonably low. Someone is probably trying funny business. Ignoring message.' return # Let us check to make sure the stream number is correct (thus # preventing an individual from sending broadcasts out on the wrong # streams or all streams). broadcastVersion, broadcastVersionLength = decodeVarint( data[readPosition:readPosition + 10]) if broadcastVersion >= 2: streamNumber, streamNumberLength = decodeVarint(data[ readPosition + broadcastVersionLength:readPosition + broadcastVersionLength + 10]) if streamNumber != self.streamNumber: print 'The stream number encoded in this broadcast message (' + str(streamNumber) + ') does not match the stream number on which it was received. Ignoring it.' return shared.inventoryLock.acquire() self.inventoryHash = calculateInventoryHash(data) if self.inventoryHash in shared.inventory: print 'We have already received this broadcast object. Ignoring.' shared.inventoryLock.release() return elif shared.isInSqlInventory(self.inventoryHash): print 'We have already received this broadcast object (it is stored on disk in the SQL inventory). Ignoring it.' shared.inventoryLock.release() return # It is valid so far. Let's let our peers know about it. objectType = 'broadcast' shared.inventory[self.inventoryHash] = ( objectType, self.streamNumber, data, embeddedTime) shared.inventoryLock.release() self.broadcastinv(self.inventoryHash) shared.numberOfBroadcastsProcessed += 1 shared.UISignalQueue.put(( 'updateNumberOfBroadcastsProcessed', 'no data')) self.processbroadcast( readPosition, data) # When this function returns, we will have either successfully processed this broadcast because we are interested in it, ignored it because we aren't interested in it, or found problem with the broadcast that warranted ignoring it. # Let us now set lengthOfTimeWeShouldUseToProcessThisMessage. If we # haven't used the specified amount of time, we shall sleep. These # values are mostly the same values used for msg messages although # broadcast messages are processed faster. if len(data) > 100000000: # Size is greater than 100 megabytes lengthOfTimeWeShouldUseToProcessThisMessage = 100 # seconds. elif len(data) > 10000000: # Between 100 and 10 megabytes lengthOfTimeWeShouldUseToProcessThisMessage = 20 # seconds. elif len(data) > 1000000: # Between 10 and 1 megabyte lengthOfTimeWeShouldUseToProcessThisMessage = 3 # seconds. else: # Less than 1 megabyte lengthOfTimeWeShouldUseToProcessThisMessage = .6 # seconds. sleepTime = lengthOfTimeWeShouldUseToProcessThisMessage - \ (time.time() - self.messageProcessingStartTime) if sleepTime > 0 and doTimingAttackMitigation: with shared.printLock: print 'Timing attack mitigation: Sleeping for', sleepTime, 'seconds.' time.sleep(sleepTime) with shared.printLock: print 'Total message processing time:', time.time() - self.messageProcessingStartTime, 'seconds.' # A broadcast message has a valid time and POW and requires processing. # The recbroadcast function calls this one. def processbroadcast(self, readPosition, data): broadcastVersion, broadcastVersionLength = decodeVarint( data[readPosition:readPosition + 9]) readPosition += broadcastVersionLength if broadcastVersion < 1 or broadcastVersion > 2: print 'Cannot decode incoming broadcast versions higher than 2. Assuming the sender isn\'t being silly, you should upgrade Bitmessage because this message shall be ignored.' return if broadcastVersion == 1: beginningOfPubkeyPosition = readPosition # used when we add the pubkey to our pubkey table sendersAddressVersion, sendersAddressVersionLength = decodeVarint( data[readPosition:readPosition + 9]) if sendersAddressVersion <= 1 or sendersAddressVersion >= 3: # Cannot decode senderAddressVersion higher than 2. Assuming # the sender isn\'t being silly, you should upgrade Bitmessage # because this message shall be ignored. return readPosition += sendersAddressVersionLength if sendersAddressVersion == 2: sendersStream, sendersStreamLength = decodeVarint( data[readPosition:readPosition + 9]) readPosition += sendersStreamLength behaviorBitfield = data[readPosition:readPosition + 4] readPosition += 4 sendersPubSigningKey = '\x04' + \ data[readPosition:readPosition + 64] readPosition += 64 sendersPubEncryptionKey = '\x04' + \ data[readPosition:readPosition + 64] readPosition += 64 endOfPubkeyPosition = readPosition sendersHash = data[readPosition:readPosition + 20] if sendersHash not in shared.broadcastSendersForWhichImWatching: # Display timing data with shared.printLock: print 'Time spent deciding that we are not interested in this v1 broadcast:', time.time() - self.messageProcessingStartTime return # At this point, this message claims to be from sendersHash and # we are interested in it. We still have to hash the public key # to make sure it is truly the key that matches the hash, and # also check the signiture. readPosition += 20 sha = hashlib.new('sha512') sha.update(sendersPubSigningKey + sendersPubEncryptionKey) ripe = hashlib.new('ripemd160') ripe.update(sha.digest()) if ripe.digest() != sendersHash: # The sender of this message lied. return messageEncodingType, messageEncodingTypeLength = decodeVarint( data[readPosition:readPosition + 9]) if messageEncodingType == 0: return readPosition += messageEncodingTypeLength messageLength, messageLengthLength = decodeVarint( data[readPosition:readPosition + 9]) readPosition += messageLengthLength message = data[readPosition:readPosition + messageLength] readPosition += messageLength readPositionAtBottomOfMessage = readPosition signatureLength, signatureLengthLength = decodeVarint( data[readPosition:readPosition + 9]) readPosition += signatureLengthLength signature = data[readPosition:readPosition + signatureLength] try: if not highlevelcrypto.verify(data[12:readPositionAtBottomOfMessage], signature, sendersPubSigningKey.encode('hex')): print 'ECDSA verify failed' return print 'ECDSA verify passed' except Exception as err: print 'ECDSA verify failed', err return # verify passed # Let's store the public key in case we want to reply to this person. # We don't have the correct nonce or time (which would let us # send out a pubkey message) so we'll just fill it with 1's. We # won't be able to send this pubkey to others (without doing # the proof of work ourselves, which this program is programmed # to not do.) sqlExecute( '''INSERT INTO pubkeys VALUES (?,?,?,?)''', ripe.digest(), '\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF' + '\xFF\xFF\xFF\xFF' + data[beginningOfPubkeyPosition:endOfPubkeyPosition], int(time.time()), 'yes') # shared.workerQueue.put(('newpubkey',(sendersAddressVersion,sendersStream,ripe.digest()))) # This will check to see whether we happen to be awaiting this # pubkey in order to send a message. If we are, it will do the # POW and send it. self.possibleNewPubkey(ripe.digest()) fromAddress = encodeAddress( sendersAddressVersion, sendersStream, ripe.digest()) with shared.printLock: print 'fromAddress:', fromAddress if messageEncodingType == 2: subject, body = self.decodeType2Message(message) elif messageEncodingType == 1: body = message subject = '' elif messageEncodingType == 0: print 'messageEncodingType == 0. Doing nothing with the message.' else: body = 'Unknown encoding type.\n\n' + repr(message) subject = '' toAddress = '[Broadcast subscribers]' if messageEncodingType != 0: t = (self.inventoryHash, toAddress, fromAddress, subject, int( time.time()), body, 'inbox', messageEncodingType, 0) helper_inbox.insert(t) shared.UISignalQueue.put(('displayNewInboxMessage', ( self.inventoryHash, toAddress, fromAddress, subject, body))) # If we are behaving as an API then we might need to run an # outside command to let some program know that a new # message has arrived. if shared.safeConfigGetBoolean('bitmessagesettings', 'apienabled'): try: apiNotifyPath = shared.config.get( 'bitmessagesettings', 'apinotifypath') except: apiNotifyPath = '' if apiNotifyPath != '': call([apiNotifyPath, "newBroadcast"]) # Display timing data with shared.printLock: print 'Time spent processing this interesting broadcast:', time.time() - self.messageProcessingStartTime if broadcastVersion == 2: cleartextStreamNumber, cleartextStreamNumberLength = decodeVarint( data[readPosition:readPosition + 10]) readPosition += cleartextStreamNumberLength initialDecryptionSuccessful = False for key, cryptorObject in shared.MyECSubscriptionCryptorObjects.items(): try: decryptedData = cryptorObject.decrypt(data[readPosition:]) toRipe = key # This is the RIPE hash of the sender's pubkey. We need this below to compare to the RIPE hash of the sender's address to verify that it was encrypted by with their key rather than some other key. initialDecryptionSuccessful = True print 'EC decryption successful using key associated with ripe hash:', key.encode('hex') break except Exception as err: pass # print 'cryptorObject.decrypt Exception:', err if not initialDecryptionSuccessful: # This is not a broadcast I am interested in. with shared.printLock: print 'Length of time program spent failing to decrypt this v2 broadcast:', time.time() - self.messageProcessingStartTime, 'seconds.' return # At this point this is a broadcast I have decrypted and thus am # interested in. signedBroadcastVersion, readPosition = decodeVarint( decryptedData[:10]) beginningOfPubkeyPosition = readPosition # used when we add the pubkey to our pubkey table sendersAddressVersion, sendersAddressVersionLength = decodeVarint( decryptedData[readPosition:readPosition + 9]) if sendersAddressVersion < 2 or sendersAddressVersion > 3: print 'Cannot decode senderAddressVersion other than 2 or 3. Assuming the sender isn\'t being silly, you should upgrade Bitmessage because this message shall be ignored.' return readPosition += sendersAddressVersionLength sendersStream, sendersStreamLength = decodeVarint( decryptedData[readPosition:readPosition + 9]) if sendersStream != cleartextStreamNumber: print 'The stream number outside of the encryption on which the POW was completed doesn\'t match the stream number inside the encryption. Ignoring broadcast.' return readPosition += sendersStreamLength behaviorBitfield = decryptedData[readPosition:readPosition + 4] readPosition += 4 sendersPubSigningKey = '\x04' + \ decryptedData[readPosition:readPosition + 64] readPosition += 64 sendersPubEncryptionKey = '\x04' + \ decryptedData[readPosition:readPosition + 64] readPosition += 64 if sendersAddressVersion >= 3: requiredAverageProofOfWorkNonceTrialsPerByte, varintLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += varintLength print 'sender\'s requiredAverageProofOfWorkNonceTrialsPerByte is', requiredAverageProofOfWorkNonceTrialsPerByte requiredPayloadLengthExtraBytes, varintLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += varintLength print 'sender\'s requiredPayloadLengthExtraBytes is', requiredPayloadLengthExtraBytes endOfPubkeyPosition = readPosition sha = hashlib.new('sha512') sha.update(sendersPubSigningKey + sendersPubEncryptionKey) ripe = hashlib.new('ripemd160') ripe.update(sha.digest()) if toRipe != ripe.digest(): print 'The encryption key used to encrypt this message doesn\'t match the keys inbedded in the message itself. Ignoring message.' return messageEncodingType, messageEncodingTypeLength = decodeVarint( decryptedData[readPosition:readPosition + 9]) if messageEncodingType == 0: return readPosition += messageEncodingTypeLength messageLength, messageLengthLength = decodeVarint( decryptedData[readPosition:readPosition + 9]) readPosition += messageLengthLength message = decryptedData[readPosition:readPosition + messageLength] readPosition += messageLength readPositionAtBottomOfMessage = readPosition signatureLength, signatureLengthLength = decodeVarint( decryptedData[readPosition:readPosition + 9]) readPosition += signatureLengthLength signature = decryptedData[ readPosition:readPosition + signatureLength] try: if not highlevelcrypto.verify(decryptedData[:readPositionAtBottomOfMessage], signature, sendersPubSigningKey.encode('hex')): print 'ECDSA verify failed' return print 'ECDSA verify passed' except Exception as err: print 'ECDSA verify failed', err return # verify passed # Let's store the public key in case we want to reply to this # person. sqlExecute('''INSERT INTO pubkeys VALUES (?,?,?,?)''', ripe.digest(), '\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF' + '\xFF\xFF\xFF\xFF' + decryptedData[beginningOfPubkeyPosition:endOfPubkeyPosition], int(time.time()), 'yes') # shared.workerQueue.put(('newpubkey',(sendersAddressVersion,sendersStream,ripe.digest()))) # This will check to see whether we happen to be awaiting this # pubkey in order to send a message. If we are, it will do the POW # and send it. self.possibleNewPubkey(ripe.digest()) fromAddress = encodeAddress( sendersAddressVersion, sendersStream, ripe.digest()) with shared.printLock: print 'fromAddress:', fromAddress if messageEncodingType == 2: subject, body = self.decodeType2Message(message) elif messageEncodingType == 1: body = message subject = '' elif messageEncodingType == 0: print 'messageEncodingType == 0. Doing nothing with the message.' else: body = 'Unknown encoding type.\n\n' + repr(message) subject = '' toAddress = '[Broadcast subscribers]' if messageEncodingType != 0: t = (self.inventoryHash, toAddress, fromAddress, subject, int( time.time()), body, 'inbox', messageEncodingType, 0) helper_inbox.insert(t) shared.UISignalQueue.put(('displayNewInboxMessage', ( self.inventoryHash, toAddress, fromAddress, subject, body))) # If we are behaving as an API then we might need to run an # outside command to let some program know that a new message # has arrived. if shared.safeConfigGetBoolean('bitmessagesettings', 'apienabled'): try: apiNotifyPath = shared.config.get( 'bitmessagesettings', 'apinotifypath') except: apiNotifyPath = '' if apiNotifyPath != '': call([apiNotifyPath, "newBroadcast"]) # Display timing data with shared.printLock: print 'Time spent processing this interesting broadcast:', time.time() - self.messageProcessingStartTime # We have received a msg message. def recmsg(self, data): self.messageProcessingStartTime = time.time() # First we must check to make sure the proof of work is sufficient. if not self.isProofOfWorkSufficient(data): print 'Proof of work in msg message insufficient.' return readPosition = 8 embeddedTime, = unpack('>I', data[readPosition:readPosition + 4]) # This section is used for the transition from 32 bit time to 64 bit # time in the protocol. if embeddedTime == 0: embeddedTime, = unpack('>Q', data[readPosition:readPosition + 8]) readPosition += 8 else: readPosition += 4 if embeddedTime > int(time.time()) + 10800: print 'The time in the msg message is too new. Ignoring it. Time:', embeddedTime return if embeddedTime < int(time.time()) - shared.maximumAgeOfAnObjectThatIAmWillingToAccept: print 'The time in the msg message is too old. Ignoring it. Time:', embeddedTime return streamNumberAsClaimedByMsg, streamNumberAsClaimedByMsgLength = decodeVarint( data[readPosition:readPosition + 9]) if streamNumberAsClaimedByMsg != self.streamNumber: print 'The stream number encoded in this msg (' + str(streamNumberAsClaimedByMsg) + ') message does not match the stream number on which it was received. Ignoring it.' return readPosition += streamNumberAsClaimedByMsgLength self.inventoryHash = calculateInventoryHash(data) shared.inventoryLock.acquire() if self.inventoryHash in shared.inventory: print 'We have already received this msg message. Ignoring.' shared.inventoryLock.release() return elif shared.isInSqlInventory(self.inventoryHash): print 'We have already received this msg message (it is stored on disk in the SQL inventory). Ignoring it.' shared.inventoryLock.release() return # This msg message is valid. Let's let our peers know about it. objectType = 'msg' shared.inventory[self.inventoryHash] = ( objectType, self.streamNumber, data, embeddedTime) shared.inventoryLock.release() self.broadcastinv(self.inventoryHash) shared.numberOfMessagesProcessed += 1 shared.UISignalQueue.put(( 'updateNumberOfMessagesProcessed', 'no data')) self.processmsg( readPosition, data) # When this function returns, we will have either successfully processed the message bound for us, ignored it because it isn't bound for us, or found problem with the message that warranted ignoring it. # Let us now set lengthOfTimeWeShouldUseToProcessThisMessage. If we # haven't used the specified amount of time, we shall sleep. These # values are based on test timings and you may change them at-will. if len(data) > 100000000: # Size is greater than 100 megabytes lengthOfTimeWeShouldUseToProcessThisMessage = 100 # seconds. Actual length of time it took my computer to decrypt and verify the signature of a 100 MB message: 3.7 seconds. elif len(data) > 10000000: # Between 100 and 10 megabytes lengthOfTimeWeShouldUseToProcessThisMessage = 20 # seconds. Actual length of time it took my computer to decrypt and verify the signature of a 10 MB message: 0.53 seconds. Actual length of time it takes in practice when processing a real message: 1.44 seconds. elif len(data) > 1000000: # Between 10 and 1 megabyte lengthOfTimeWeShouldUseToProcessThisMessage = 3 # seconds. Actual length of time it took my computer to decrypt and verify the signature of a 1 MB message: 0.18 seconds. Actual length of time it takes in practice when processing a real message: 0.30 seconds. else: # Less than 1 megabyte lengthOfTimeWeShouldUseToProcessThisMessage = .6 # seconds. Actual length of time it took my computer to decrypt and verify the signature of a 100 KB message: 0.15 seconds. Actual length of time it takes in practice when processing a real message: 0.25 seconds. sleepTime = lengthOfTimeWeShouldUseToProcessThisMessage - \ (time.time() - self.messageProcessingStartTime) if sleepTime > 0 and doTimingAttackMitigation: with shared.printLock: print 'Timing attack mitigation: Sleeping for', sleepTime, 'seconds.' time.sleep(sleepTime) with shared.printLock: print 'Total message processing time:', time.time() - self.messageProcessingStartTime, 'seconds.' # A msg message has a valid time and POW and requires processing. The # recmsg function calls this one. def processmsg(self, readPosition, encryptedData): initialDecryptionSuccessful = False # Let's check whether this is a message acknowledgement bound for us. if encryptedData[readPosition:] in shared.ackdataForWhichImWatching: with shared.printLock: print 'This msg IS an acknowledgement bound for me.' del shared.ackdataForWhichImWatching[encryptedData[readPosition:]] sqlExecute('UPDATE sent SET status=? WHERE ackdata=?', 'ackreceived', encryptedData[readPosition:]) shared.UISignalQueue.put(('updateSentItemStatusByAckdata', (encryptedData[readPosition:], tr.translateText("MainWindow",'Acknowledgement of the message received. %1').arg(unicode( time.strftime(shared.config.get('bitmessagesettings', 'timeformat'), time.localtime(int(time.time()))), 'utf-8'))))) return else: with shared.printLock: print 'This was NOT an acknowledgement bound for me.' # print 'shared.ackdataForWhichImWatching', shared.ackdataForWhichImWatching # This is not an acknowledgement bound for me. See if it is a message # bound for me by trying to decrypt it with my private keys. for key, cryptorObject in shared.myECCryptorObjects.items(): try: decryptedData = cryptorObject.decrypt( encryptedData[readPosition:]) toRipe = key # This is the RIPE hash of my pubkeys. We need this below to compare to the destination_ripe included in the encrypted data. initialDecryptionSuccessful = True with shared.printLock: print 'EC decryption successful using key associated with ripe hash:', key.encode('hex') break except Exception as err: pass # print 'cryptorObject.decrypt Exception:', err if not initialDecryptionSuccessful: # This is not a message bound for me. with shared.printLock: print 'Length of time program spent failing to decrypt this message:', time.time() - self.messageProcessingStartTime, 'seconds.' else: # This is a message bound for me. toAddress = shared.myAddressesByHash[ toRipe] # Look up my address based on the RIPE hash. readPosition = 0 messageVersion, messageVersionLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += messageVersionLength if messageVersion != 1: print 'Cannot understand message versions other than one. Ignoring message.' return sendersAddressVersionNumber, sendersAddressVersionNumberLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += sendersAddressVersionNumberLength if sendersAddressVersionNumber == 0: print 'Cannot understand sendersAddressVersionNumber = 0. Ignoring message.' return if sendersAddressVersionNumber >= 4: print 'Sender\'s address version number', sendersAddressVersionNumber, 'not yet supported. Ignoring message.' return if len(decryptedData) < 170: print 'Length of the unencrypted data is unreasonably short. Sanity check failed. Ignoring message.' return sendersStreamNumber, sendersStreamNumberLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) if sendersStreamNumber == 0: print 'sender\'s stream number is 0. Ignoring message.' return readPosition += sendersStreamNumberLength behaviorBitfield = decryptedData[readPosition:readPosition + 4] readPosition += 4 pubSigningKey = '\x04' + decryptedData[ readPosition:readPosition + 64] readPosition += 64 pubEncryptionKey = '\x04' + decryptedData[ readPosition:readPosition + 64] readPosition += 64 if sendersAddressVersionNumber >= 3: requiredAverageProofOfWorkNonceTrialsPerByte, varintLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += varintLength print 'sender\'s requiredAverageProofOfWorkNonceTrialsPerByte is', requiredAverageProofOfWorkNonceTrialsPerByte requiredPayloadLengthExtraBytes, varintLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += varintLength print 'sender\'s requiredPayloadLengthExtraBytes is', requiredPayloadLengthExtraBytes endOfThePublicKeyPosition = readPosition # needed for when we store the pubkey in our database of pubkeys for later use. if toRipe != decryptedData[readPosition:readPosition + 20]: with shared.printLock: print 'The original sender of this message did not send it to you. Someone is attempting a Surreptitious Forwarding Attack.' print 'See: http://world.std.com/~dtd/sign_encrypt/sign_encrypt7.html' print 'your toRipe:', toRipe.encode('hex') print 'embedded destination toRipe:', decryptedData[readPosition:readPosition + 20].encode('hex') return readPosition += 20 messageEncodingType, messageEncodingTypeLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += messageEncodingTypeLength messageLength, messageLengthLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += messageLengthLength message = decryptedData[readPosition:readPosition + messageLength] # print 'First 150 characters of message:', repr(message[:150]) readPosition += messageLength ackLength, ackLengthLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += ackLengthLength ackData = decryptedData[readPosition:readPosition + ackLength] readPosition += ackLength positionOfBottomOfAckData = readPosition # needed to mark the end of what is covered by the signature signatureLength, signatureLengthLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += signatureLengthLength signature = decryptedData[ readPosition:readPosition + signatureLength] try: if not highlevelcrypto.verify(decryptedData[:positionOfBottomOfAckData], signature, pubSigningKey.encode('hex')): print 'ECDSA verify failed' return print 'ECDSA verify passed' except Exception as err: print 'ECDSA verify failed', err return with shared.printLock: print 'As a matter of intellectual curiosity, here is the Bitcoin address associated with the keys owned by the other person:', helper_bitcoin.calculateBitcoinAddressFromPubkey(pubSigningKey), ' ..and here is the testnet address:', helper_bitcoin.calculateTestnetAddressFromPubkey(pubSigningKey), '. The other person must take their private signing key from Bitmessage and import it into Bitcoin (or a service like Blockchain.info) for it to be of any use. Do not use this unless you know what you are doing.' # calculate the fromRipe. sha = hashlib.new('sha512') sha.update(pubSigningKey + pubEncryptionKey) ripe = hashlib.new('ripemd160') ripe.update(sha.digest()) # Let's store the public key in case we want to reply to this # person. sqlExecute( '''INSERT INTO pubkeys VALUES (?,?,?,?)''', ripe.digest(), '\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF' + '\xFF\xFF\xFF\xFF' + decryptedData[messageVersionLength:endOfThePublicKeyPosition], int(time.time()), 'yes') # shared.workerQueue.put(('newpubkey',(sendersAddressVersionNumber,sendersStreamNumber,ripe.digest()))) # This will check to see whether we happen to be awaiting this # pubkey in order to send a message. If we are, it will do the POW # and send it. self.possibleNewPubkey(ripe.digest()) fromAddress = encodeAddress( sendersAddressVersionNumber, sendersStreamNumber, ripe.digest()) # If this message is bound for one of my version 3 addresses (or # higher), then we must check to make sure it meets our demanded # proof of work requirement. if decodeAddress(toAddress)[1] >= 3: # If the toAddress version number is 3 or higher: if not shared.isAddressInMyAddressBookSubscriptionsListOrWhitelist(fromAddress): # If I'm not friendly with this person: requiredNonceTrialsPerByte = shared.config.getint( toAddress, 'noncetrialsperbyte') requiredPayloadLengthExtraBytes = shared.config.getint( toAddress, 'payloadlengthextrabytes') if not self.isProofOfWorkSufficient(encryptedData, requiredNonceTrialsPerByte, requiredPayloadLengthExtraBytes): print 'Proof of work in msg message insufficient only because it does not meet our higher requirement.' return blockMessage = False # Gets set to True if the user shouldn't see the message according to black or white lists. if shared.config.get('bitmessagesettings', 'blackwhitelist') == 'black': # If we are using a blacklist queryreturn = sqlQuery( '''SELECT label FROM blacklist where address=? and enabled='1' ''', fromAddress) if queryreturn != []: with shared.printLock: print 'Message ignored because address is in blacklist.' blockMessage = True else: # We're using a whitelist queryreturn = sqlQuery( '''SELECT label FROM whitelist where address=? and enabled='1' ''', toAddress) if queryreturn == []: print 'Message ignored because address not in whitelist.' blockMessage = True if not blockMessage: print 'fromAddress:', fromAddress print 'First 150 characters of message:', repr(message[:150]) toLabel = shared.config.get(toAddress, 'label') if toLabel == '': toLabel = toAddress if messageEncodingType == 2: subject, body = self.decodeType2Message(message) elif messageEncodingType == 1: body = message subject = '' elif messageEncodingType == 0: print 'messageEncodingType == 0. Doing nothing with the message. They probably just sent it so that we would store their public key or send their ack data for them.' else: body = 'Unknown encoding type.\n\n' + repr(message) subject = '' if messageEncodingType != 0: t = (self.inventoryHash, toAddress, fromAddress, subject, int( time.time()), body, 'inbox', messageEncodingType, 0) helper_inbox.insert(t) shared.UISignalQueue.put(('displayNewInboxMessage', ( self.inventoryHash, toAddress, fromAddress, subject, body))) # If we are behaving as an API then we might need to run an # outside command to let some program know that a new message # has arrived. if shared.safeConfigGetBoolean('bitmessagesettings', 'apienabled'): try: apiNotifyPath = shared.config.get( 'bitmessagesettings', 'apinotifypath') except: apiNotifyPath = '' if apiNotifyPath != '': call([apiNotifyPath, "newMessage"]) # Let us now check and see whether our receiving address is # behaving as a mailing list if shared.safeConfigGetBoolean(toAddress, 'mailinglist'): try: mailingListName = shared.config.get( toAddress, 'mailinglistname') except: mailingListName = '' # Let us send out this message as a broadcast subject = self.addMailingListNameToSubject( subject, mailingListName) # Let us now send this message out as a broadcast message = time.strftime("%a, %Y-%m-%d %H:%M:%S UTC", time.gmtime( )) + ' Message ostensibly from ' + fromAddress + ':\n\n' + body fromAddress = toAddress # The fromAddress for the broadcast that we are about to send is the toAddress (my address) for the msg message we are currently processing. ackdata = OpenSSL.rand( 32) # We don't actually need the ackdata for acknowledgement since this is a broadcast message but we can use it to update the user interface when the POW is done generating. toAddress = '[Broadcast subscribers]' ripe = '' t = ('', toAddress, ripe, fromAddress, subject, message, ackdata, int( time.time()), 'broadcastqueued', 1, 1, 'sent', 2) helper_sent.insert(t) shared.UISignalQueue.put(('displayNewSentMessage', ( toAddress, '[Broadcast subscribers]', fromAddress, subject, message, ackdata))) shared.workerQueue.put(('sendbroadcast', '')) if self.isAckDataValid(ackData): print 'ackData is valid. Will process it.' self.ackDataThatWeHaveYetToSend.append( ackData) # When we have processed all data, the processData function will pop the ackData out and process it as if it is a message received from our peer. # Display timing data timeRequiredToAttemptToDecryptMessage = time.time( ) - self.messageProcessingStartTime shared.successfullyDecryptMessageTimings.append( timeRequiredToAttemptToDecryptMessage) sum = 0 for item in shared.successfullyDecryptMessageTimings: sum += item with shared.printLock: print 'Time to decrypt this message successfully:', timeRequiredToAttemptToDecryptMessage print 'Average time for all message decryption successes since startup:', sum / len(shared.successfullyDecryptMessageTimings) def decodeType2Message(self, message): bodyPositionIndex = string.find(message, '\nBody:') if bodyPositionIndex > 1: subject = message[8:bodyPositionIndex] # Only save and show the first 500 characters of the subject. # Any more is probably an attack. subject = subject[:500] body = message[bodyPositionIndex + 6:] else: subject = '' body = message # Throw away any extra lines (headers) after the subject. if subject: subject = subject.splitlines()[0] return subject, body def isAckDataValid(self, ackData): if len(ackData) < 24: print 'The length of ackData is unreasonably short. Not sending ackData.' return False if ackData[0:4] != '\xe9\xbe\xb4\xd9': print 'Ackdata magic bytes were wrong. Not sending ackData.' return False ackDataPayloadLength, = unpack('>L', ackData[16:20]) if len(ackData) - 24 != ackDataPayloadLength: print 'ackData payload length doesn\'t match the payload length specified in the header. Not sending ackdata.' return False if ackData[4:16] != 'getpubkey\x00\x00\x00' and ackData[4:16] != 'pubkey\x00\x00\x00\x00\x00\x00' and ackData[4:16] != 'msg\x00\x00\x00\x00\x00\x00\x00\x00\x00' and ackData[4:16] != 'broadcast\x00\x00\x00': return False return True def addMailingListNameToSubject(self, subject, mailingListName): subject = subject.strip() if subject[:3] == 'Re:' or subject[:3] == 'RE:': subject = subject[3:].strip() if '[' + mailingListName + ']' in subject: return subject else: return '[' + mailingListName + '] ' + subject def possibleNewPubkey(self, toRipe): if toRipe in shared.neededPubkeys: print 'We have been awaiting the arrival of this pubkey.' del shared.neededPubkeys[toRipe] sqlExecute( '''UPDATE sent SET status='doingmsgpow' WHERE toripe=? AND (status='awaitingpubkey' or status='doingpubkeypow') and folder='sent' ''', toRipe) shared.workerQueue.put(('sendmessage', '')) else: with shared.printLock: print 'We don\'t need this pub key. We didn\'t ask for it. Pubkey hash:', toRipe.encode('hex') # We have received a pubkey def recpubkey(self, data): self.pubkeyProcessingStartTime = time.time() if len(data) < 146 or len(data) > 600: # sanity check return # We must check to make sure the proof of work is sufficient. if not self.isProofOfWorkSufficient(data): print 'Proof of work in pubkey message insufficient.' return readPosition = 8 # for the nonce embeddedTime, = unpack('>I', data[readPosition:readPosition + 4]) # This section is used for the transition from 32 bit time to 64 bit # time in the protocol. if embeddedTime == 0: embeddedTime, = unpack('>Q', data[readPosition:readPosition + 8]) readPosition += 8 else: readPosition += 4 if embeddedTime < int(time.time()) - shared.lengthOfTimeToHoldOnToAllPubkeys: with shared.printLock: print 'The embedded time in this pubkey message is too old. Ignoring. Embedded time is:', embeddedTime return if embeddedTime > int(time.time()) + 10800: with shared.printLock: print 'The embedded time in this pubkey message more than several hours in the future. This is irrational. Ignoring message.' return addressVersion, varintLength = decodeVarint( data[readPosition:readPosition + 10]) readPosition += varintLength streamNumber, varintLength = decodeVarint( data[readPosition:readPosition + 10]) readPosition += varintLength if self.streamNumber != streamNumber: print 'stream number embedded in this pubkey doesn\'t match our stream number. Ignoring.' return inventoryHash = calculateInventoryHash(data) shared.inventoryLock.acquire() if inventoryHash in shared.inventory: print 'We have already received this pubkey. Ignoring it.' shared.inventoryLock.release() return elif shared.isInSqlInventory(inventoryHash): print 'We have already received this pubkey (it is stored on disk in the SQL inventory). Ignoring it.' shared.inventoryLock.release() return objectType = 'pubkey' shared.inventory[inventoryHash] = ( objectType, self.streamNumber, data, embeddedTime) shared.inventoryLock.release() self.broadcastinv(inventoryHash) shared.numberOfPubkeysProcessed += 1 shared.UISignalQueue.put(( 'updateNumberOfPubkeysProcessed', 'no data')) self.processpubkey(data) lengthOfTimeWeShouldUseToProcessThisMessage = .2 sleepTime = lengthOfTimeWeShouldUseToProcessThisMessage - \ (time.time() - self.pubkeyProcessingStartTime) if sleepTime > 0 and doTimingAttackMitigation: with shared.printLock: print 'Timing attack mitigation: Sleeping for', sleepTime, 'seconds.' time.sleep(sleepTime) with shared.printLock: print 'Total pubkey processing time:', time.time() - self.pubkeyProcessingStartTime, 'seconds.' def processpubkey(self, data): readPosition = 8 # for the nonce embeddedTime, = unpack('>I', data[readPosition:readPosition + 4]) # This section is used for the transition from 32 bit time to 64 bit # time in the protocol. if embeddedTime == 0: embeddedTime, = unpack('>Q', data[readPosition:readPosition + 8]) readPosition += 8 else: readPosition += 4 addressVersion, varintLength = decodeVarint( data[readPosition:readPosition + 10]) readPosition += varintLength streamNumber, varintLength = decodeVarint( data[readPosition:readPosition + 10]) readPosition += varintLength if addressVersion == 0: print '(Within processpubkey) addressVersion of 0 doesn\'t make sense.' return if addressVersion > 3 or addressVersion == 1: with shared.printLock: print 'This version of Bitmessage cannot handle version', addressVersion, 'addresses.' return if addressVersion == 2: if len(data) < 146: # sanity check. This is the minimum possible length. print '(within processpubkey) payloadLength less than 146. Sanity check failed.' return bitfieldBehaviors = data[readPosition:readPosition + 4] readPosition += 4 publicSigningKey = data[readPosition:readPosition + 64] # Is it possible for a public key to be invalid such that trying to # encrypt or sign with it will cause an error? If it is, we should # probably test these keys here. readPosition += 64 publicEncryptionKey = data[readPosition:readPosition + 64] if len(publicEncryptionKey) < 64: print 'publicEncryptionKey length less than 64. Sanity check failed.' return sha = hashlib.new('sha512') sha.update( '\x04' + publicSigningKey + '\x04' + publicEncryptionKey) ripeHasher = hashlib.new('ripemd160') ripeHasher.update(sha.digest()) ripe = ripeHasher.digest() with shared.printLock: print 'within recpubkey, addressVersion:', addressVersion, ', streamNumber:', streamNumber print 'ripe', ripe.encode('hex') print 'publicSigningKey in hex:', publicSigningKey.encode('hex') print 'publicEncryptionKey in hex:', publicEncryptionKey.encode('hex') queryreturn = sqlQuery( '''SELECT usedpersonally FROM pubkeys WHERE hash=? AND usedpersonally='yes' ''', ripe) if queryreturn != []: # if this pubkey is already in our database and if we have used it personally: print 'We HAVE used this pubkey personally. Updating time.' t = (ripe, data, embeddedTime, 'yes') else: print 'We have NOT used this pubkey personally. Inserting in database.' t = (ripe, data, embeddedTime, 'no') # This will also update the embeddedTime. sqlExecute('''INSERT INTO pubkeys VALUES (?,?,?,?)''', *t) # shared.workerQueue.put(('newpubkey',(addressVersion,streamNumber,ripe))) self.possibleNewPubkey(ripe) if addressVersion == 3: if len(data) < 170: # sanity check. print '(within processpubkey) payloadLength less than 170. Sanity check failed.' return bitfieldBehaviors = data[readPosition:readPosition + 4] readPosition += 4 publicSigningKey = '\x04' + data[readPosition:readPosition + 64] # Is it possible for a public key to be invalid such that trying to # encrypt or sign with it will cause an error? If it is, we should # probably test these keys here. readPosition += 64 publicEncryptionKey = '\x04' + data[readPosition:readPosition + 64] readPosition += 64 specifiedNonceTrialsPerByte, specifiedNonceTrialsPerByteLength = decodeVarint( data[readPosition:readPosition + 10]) readPosition += specifiedNonceTrialsPerByteLength specifiedPayloadLengthExtraBytes, specifiedPayloadLengthExtraBytesLength = decodeVarint( data[readPosition:readPosition + 10]) readPosition += specifiedPayloadLengthExtraBytesLength endOfSignedDataPosition = readPosition signatureLength, signatureLengthLength = decodeVarint( data[readPosition:readPosition + 10]) readPosition += signatureLengthLength signature = data[readPosition:readPosition + signatureLength] try: if not highlevelcrypto.verify(data[8:endOfSignedDataPosition], signature, publicSigningKey.encode('hex')): print 'ECDSA verify failed (within processpubkey)' return print 'ECDSA verify passed (within processpubkey)' except Exception as err: print 'ECDSA verify failed (within processpubkey)', err return sha = hashlib.new('sha512') sha.update(publicSigningKey + publicEncryptionKey) ripeHasher = hashlib.new('ripemd160') ripeHasher.update(sha.digest()) ripe = ripeHasher.digest() with shared.printLock: print 'within recpubkey, addressVersion:', addressVersion, ', streamNumber:', streamNumber print 'ripe', ripe.encode('hex') print 'publicSigningKey in hex:', publicSigningKey.encode('hex') print 'publicEncryptionKey in hex:', publicEncryptionKey.encode('hex') queryreturn = sqlQuery('''SELECT usedpersonally FROM pubkeys WHERE hash=? AND usedpersonally='yes' ''', ripe) if queryreturn != []: # if this pubkey is already in our database and if we have used it personally: print 'We HAVE used this pubkey personally. Updating time.' t = (ripe, data, embeddedTime, 'yes') else: print 'We have NOT used this pubkey personally. Inserting in database.' t = (ripe, data, embeddedTime, 'no') # This will also update the embeddedTime. sqlExecute('''INSERT INTO pubkeys VALUES (?,?,?,?)''', *t) # shared.workerQueue.put(('newpubkey',(addressVersion,streamNumber,ripe))) self.possibleNewPubkey(ripe) # We have received a getpubkey message def recgetpubkey(self, data): if not self.isProofOfWorkSufficient(data): print 'Proof of work in getpubkey message insufficient.' return if len(data) < 34: print 'getpubkey message doesn\'t contain enough data. Ignoring.' return readPosition = 8 # bypass the nonce embeddedTime, = unpack('>I', data[readPosition:readPosition + 4]) # This section is used for the transition from 32 bit time to 64 bit # time in the protocol. if embeddedTime == 0: embeddedTime, = unpack('>Q', data[readPosition:readPosition + 8]) readPosition += 8 else: readPosition += 4 if embeddedTime > int(time.time()) + 10800: print 'The time in this getpubkey message is too new. Ignoring it. Time:', embeddedTime return if embeddedTime < int(time.time()) - shared.maximumAgeOfAnObjectThatIAmWillingToAccept: print 'The time in this getpubkey message is too old. Ignoring it. Time:', embeddedTime return requestedAddressVersionNumber, addressVersionLength = decodeVarint( data[readPosition:readPosition + 10]) readPosition += addressVersionLength streamNumber, streamNumberLength = decodeVarint( data[readPosition:readPosition + 10]) if streamNumber != self.streamNumber: print 'The streamNumber', streamNumber, 'doesn\'t match our stream number:', self.streamNumber return readPosition += streamNumberLength inventoryHash = calculateInventoryHash(data) shared.inventoryLock.acquire() if inventoryHash in shared.inventory: print 'We have already received this getpubkey request. Ignoring it.' shared.inventoryLock.release() return elif shared.isInSqlInventory(inventoryHash): print 'We have already received this getpubkey request (it is stored on disk in the SQL inventory). Ignoring it.' shared.inventoryLock.release() return objectType = 'getpubkey' shared.inventory[inventoryHash] = ( objectType, self.streamNumber, data, embeddedTime) shared.inventoryLock.release() # This getpubkey request is valid so far. Forward to peers. self.broadcastinv(inventoryHash) if requestedAddressVersionNumber == 0: print 'The requestedAddressVersionNumber of the pubkey request is zero. That doesn\'t make any sense. Ignoring it.' return elif requestedAddressVersionNumber == 1: print 'The requestedAddressVersionNumber of the pubkey request is 1 which isn\'t supported anymore. Ignoring it.' return elif requestedAddressVersionNumber > 3: print 'The requestedAddressVersionNumber of the pubkey request is too high. Can\'t understand. Ignoring it.' return requestedHash = data[readPosition:readPosition + 20] if len(requestedHash) != 20: print 'The length of the requested hash is not 20 bytes. Something is wrong. Ignoring.' return with shared.printLock: print 'the hash requested in this getpubkey request is:', requestedHash.encode('hex') if requestedHash in shared.myAddressesByHash: # if this address hash is one of mine if decodeAddress(shared.myAddressesByHash[requestedHash])[1] != requestedAddressVersionNumber: with shared.printLock: sys.stderr.write( '(Within the recgetpubkey function) Someone requested one of my pubkeys but the requestedAddressVersionNumber doesn\'t match my actual address version number. They shouldn\'t have done that. Ignoring.\n') return if shared.safeConfigGetBoolean(shared.myAddressesByHash[requestedHash], 'chan'): with shared.printLock: print 'Ignoring getpubkey request because it is for one of my chan addresses. The other party should already have the pubkey.' return try: lastPubkeySendTime = int(shared.config.get( shared.myAddressesByHash[requestedHash], 'lastpubkeysendtime')) except: lastPubkeySendTime = 0 if lastPubkeySendTime > time.time() - shared.lengthOfTimeToHoldOnToAllPubkeys: # If the last time we sent our pubkey was more recent than 28 days ago... with shared.printLock: print 'Found getpubkey-requested-hash in my list of EC hashes BUT we already sent it recently. Ignoring request. The lastPubkeySendTime is:', lastPubkeySendTime return with shared.printLock: print 'Found getpubkey-requested-hash in my list of EC hashes. Telling Worker thread to do the POW for a pubkey message and send it out.' if requestedAddressVersionNumber == 2: shared.workerQueue.put(( 'doPOWForMyV2Pubkey', requestedHash)) elif requestedAddressVersionNumber == 3: shared.workerQueue.put(( 'sendOutOrStoreMyV3Pubkey', requestedHash)) else: with shared.printLock: print 'This getpubkey request is not for any of my keys.' # We have received an inv message def recinv(self, data): totalNumberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave = 0 # ..from all peers, counting duplicates seperately (because they take up memory) if len(shared.numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer) > 0: for key, value in shared.numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer.items(): totalNumberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave += value with shared.printLock: print 'number of keys(hosts) in shared.numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer:', len(shared.numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer) print 'totalNumberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave = ', totalNumberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave numberOfItemsInInv, lengthOfVarint = decodeVarint(data[:10]) if numberOfItemsInInv > 50000: sys.stderr.write('Too many items in inv message!') return if len(data) < lengthOfVarint + (numberOfItemsInInv * 32): print 'inv message doesn\'t contain enough data. Ignoring.' return if numberOfItemsInInv == 1: # we'll just request this data from the person who advertised the object. if totalNumberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave > 200000 and len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) > 1000: # inv flooding attack mitigation with shared.printLock: print 'We already have', totalNumberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave, 'items yet to retrieve from peers and over 1000 from this node in particular. Ignoring this inv message.' return self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware[ data[lengthOfVarint:32 + lengthOfVarint]] = 0 if data[lengthOfVarint:32 + lengthOfVarint] in shared.inventory: with shared.printLock: print 'Inventory (in memory) has inventory item already.' elif shared.isInSqlInventory(data[lengthOfVarint:32 + lengthOfVarint]): print 'Inventory (SQL on disk) has inventory item already.' else: self.sendgetdata(data[lengthOfVarint:32 + lengthOfVarint]) else: print 'inv message lists', numberOfItemsInInv, 'objects.' for i in range(numberOfItemsInInv): # upon finishing dealing with an incoming message, the receiveDataThread will request a random object from the peer. This way if we get multiple inv messages from multiple peers which list mostly the same objects, we will make getdata requests for different random objects from the various peers. if len(data[lengthOfVarint + (32 * i):32 + lengthOfVarint + (32 * i)]) == 32: # The length of an inventory hash should be 32. If it isn't 32 then the remote node is either badly programmed or behaving nefariously. if totalNumberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave > 200000 and len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) > 1000: # inv flooding attack mitigation with shared.printLock: print 'We already have', totalNumberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave, 'items yet to retrieve from peers and over', len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave), 'from this node in particular. Ignoring the rest of this inv message.' break self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware[data[ lengthOfVarint + (32 * i):32 + lengthOfVarint + (32 * i)]] = 0 self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave[ data[lengthOfVarint + (32 * i):32 + lengthOfVarint + (32 * i)]] = 0 shared.numberOfObjectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHavePerPeer[ self.peer] = len(self.objectsThatWeHaveYetToCheckAndSeeWhetherWeAlreadyHave) # Send a getdata message to our peer to request the object with the given # hash def sendgetdata(self, hash): with shared.printLock: print 'sending getdata to retrieve object with hash:', hash.encode('hex') payload = '\x01' + hash headerData = '\xe9\xbe\xb4\xd9' # magic bits, slighly different from Bitcoin's magic bits. headerData += 'getdata\x00\x00\x00\x00\x00' headerData += pack('>L', len( payload)) # payload length. Note that we add an extra 8 for the nonce. headerData += hashlib.sha512(payload).digest()[:4] try: self.sock.sendall(headerData + payload) except Exception as err: # if not 'Bad file descriptor' in err: with shared.printLock: print 'sock.sendall error:', err # We have received a getdata request from our peer def recgetdata(self, data): numberOfRequestedInventoryItems, lengthOfVarint = decodeVarint( data[:10]) if len(data) < lengthOfVarint + (32 * numberOfRequestedInventoryItems): print 'getdata message does not contain enough data. Ignoring.' return for i in xrange(numberOfRequestedInventoryItems): hash = data[lengthOfVarint + ( i * 32):32 + lengthOfVarint + (i * 32)] with shared.printLock: print 'received getdata request for item:', hash.encode('hex') # print 'inventory is', shared.inventory if hash in shared.inventory: objectType, streamNumber, payload, receivedTime = shared.inventory[ hash] self.sendData(objectType, payload) else: queryreturn = sqlQuery( '''select objecttype, payload from inventory where hash=?''', hash) if queryreturn != []: for row in queryreturn: objectType, payload = row self.sendData(objectType, payload) else: print 'Someone asked for an object with a getdata which is not in either our memory inventory or our SQL inventory. That shouldn\'t have happened.' # Our peer has requested (in a getdata message) that we send an object. def sendData(self, objectType, payload): headerData = '\xe9\xbe\xb4\xd9' # magic bits, slighly different from Bitcoin's magic bits. if objectType == 'pubkey': with shared.printLock: print 'sending pubkey' headerData += 'pubkey\x00\x00\x00\x00\x00\x00' elif objectType == 'getpubkey' or objectType == 'pubkeyrequest': with shared.printLock: print 'sending getpubkey' headerData += 'getpubkey\x00\x00\x00' elif objectType == 'msg': with shared.printLock: print 'sending msg' headerData += 'msg\x00\x00\x00\x00\x00\x00\x00\x00\x00' elif objectType == 'broadcast': with shared.printLock: print 'sending broadcast' headerData += 'broadcast\x00\x00\x00' else: sys.stderr.write( 'Error: sendData has been asked to send a strange objectType: %s\n' % str(objectType)) return headerData += pack('>L', len(payload)) # payload length. headerData += hashlib.sha512(payload).digest()[:4] try: self.sock.sendall(headerData + payload) except Exception as err: # if not 'Bad file descriptor' in err: with shared.printLock: print 'sock.sendall error:', err # Send an inv message with just one hash to all of our peers def broadcastinv(self, hash): with shared.printLock: print 'broadcasting inv with hash:', hash.encode('hex') shared.broadcastToSendDataQueues((self.streamNumber, 'sendinv', hash)) # We have received an addr message. def recaddr(self, data): listOfAddressDetailsToBroadcastToPeers = [] numberOfAddressesIncluded = 0 numberOfAddressesIncluded, lengthOfNumberOfAddresses = decodeVarint( data[:10]) if shared.verbose >= 1: with shared.printLock: print 'addr message contains', numberOfAddressesIncluded, 'IP addresses.' if self.remoteProtocolVersion == 1: if numberOfAddressesIncluded > 1000 or numberOfAddressesIncluded == 0: return if len(data) != lengthOfNumberOfAddresses + (34 * numberOfAddressesIncluded): print 'addr message does not contain the correct amount of data. Ignoring.' return needToWriteKnownNodesToDisk = False for i in range(0, numberOfAddressesIncluded): try: if data[16 + lengthOfNumberOfAddresses + (34 * i):28 + lengthOfNumberOfAddresses + (34 * i)] != '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF': with shared.printLock: print 'Skipping IPv6 address.', repr(data[16 + lengthOfNumberOfAddresses + (34 * i):28 + lengthOfNumberOfAddresses + (34 * i)]) continue except Exception as err: with shared.printLock: sys.stderr.write( 'ERROR TRYING TO UNPACK recaddr (to test for an IPv6 address). Message: %s\n' % str(err)) break # giving up on unpacking any more. We should still be connected however. try: recaddrStream, = unpack('>I', data[4 + lengthOfNumberOfAddresses + ( 34 * i):8 + lengthOfNumberOfAddresses + (34 * i)]) except Exception as err: with shared.printLock: sys.stderr.write( 'ERROR TRYING TO UNPACK recaddr (recaddrStream). Message: %s\n' % str(err)) break # giving up on unpacking any more. We should still be connected however. if recaddrStream == 0: continue if recaddrStream != self.streamNumber and recaddrStream != (self.streamNumber * 2) and recaddrStream != ((self.streamNumber * 2) + 1): # if the embedded stream number is not in my stream or either of my child streams then ignore it. Someone might be trying funny business. continue try: recaddrServices, = unpack('>Q', data[8 + lengthOfNumberOfAddresses + ( 34 * i):16 + lengthOfNumberOfAddresses + (34 * i)]) except Exception as err: with shared.printLock: sys.stderr.write( 'ERROR TRYING TO UNPACK recaddr (recaddrServices). Message: %s\n' % str(err)) break # giving up on unpacking any more. We should still be connected however. try: recaddrPort, = unpack('>H', data[32 + lengthOfNumberOfAddresses + ( 34 * i):34 + lengthOfNumberOfAddresses + (34 * i)]) except Exception as err: with shared.printLock: sys.stderr.write( 'ERROR TRYING TO UNPACK recaddr (recaddrPort). Message: %s\n' % str(err)) break # giving up on unpacking any more. We should still be connected however. # print 'Within recaddr(): IP', recaddrIP, ', Port', # recaddrPort, ', i', i hostFromAddrMessage = socket.inet_ntoa(data[ 28 + lengthOfNumberOfAddresses + (34 * i):32 + lengthOfNumberOfAddresses + (34 * i)]) # print 'hostFromAddrMessage', hostFromAddrMessage if data[28 + lengthOfNumberOfAddresses + (34 * i)] == '\x7F': print 'Ignoring IP address in loopback range:', hostFromAddrMessage continue if helper_generic.isHostInPrivateIPRange(hostFromAddrMessage): print 'Ignoring IP address in private range:', hostFromAddrMessage continue timeSomeoneElseReceivedMessageFromThisNode, = unpack('>I', data[lengthOfNumberOfAddresses + ( 34 * i):4 + lengthOfNumberOfAddresses + (34 * i)]) # This is the 'time' value in the received addr message. if recaddrStream not in shared.knownNodes: # knownNodes is a dictionary of dictionaries with one outer dictionary for each stream. If the outer stream dictionary doesn't exist yet then we must make it. shared.knownNodesLock.acquire() shared.knownNodes[recaddrStream] = {} shared.knownNodesLock.release() peerFromAddrMessage = shared.Peer(hostFromAddrMessage, recaddrPort) if peerFromAddrMessage not in shared.knownNodes[recaddrStream]: if len(shared.knownNodes[recaddrStream]) < 20000 and timeSomeoneElseReceivedMessageFromThisNode > (int(time.time()) - 10800) and timeSomeoneElseReceivedMessageFromThisNode < (int(time.time()) + 10800): # If we have more than 20000 nodes in our list already then just forget about adding more. Also, make sure that the time that someone else received a message from this node is within three hours from now. shared.knownNodesLock.acquire() shared.knownNodes[recaddrStream][peerFromAddrMessage] = timeSomeoneElseReceivedMessageFromThisNode shared.knownNodesLock.release() needToWriteKnownNodesToDisk = True hostDetails = ( timeSomeoneElseReceivedMessageFromThisNode, recaddrStream, recaddrServices, hostFromAddrMessage, recaddrPort) listOfAddressDetailsToBroadcastToPeers.append( hostDetails) else: timeLastReceivedMessageFromThisNode = shared.knownNodes[recaddrStream][ peerFromAddrMessage] # PORT in this case is either the port we used to connect to the remote node, or the port that was specified by someone else in a past addr message. if (timeLastReceivedMessageFromThisNode < timeSomeoneElseReceivedMessageFromThisNode) and (timeSomeoneElseReceivedMessageFromThisNode < int(time.time())): shared.knownNodesLock.acquire() shared.knownNodes[recaddrStream][peerFromAddrMessage] = timeSomeoneElseReceivedMessageFromThisNode shared.knownNodesLock.release() if needToWriteKnownNodesToDisk: # Runs if any nodes were new to us. Also, share those nodes with our peers. shared.knownNodesLock.acquire() output = open(shared.appdata + 'knownnodes.dat', 'wb') pickle.dump(shared.knownNodes, output) output.close() shared.knownNodesLock.release() self.broadcastaddr( listOfAddressDetailsToBroadcastToPeers) # no longer broadcast with shared.printLock: print 'knownNodes currently has', len(shared.knownNodes[self.streamNumber]), 'nodes for this stream.' elif self.remoteProtocolVersion >= 2: # The difference is that in protocol version 2, network addresses use 64 bit times rather than 32 bit times. if numberOfAddressesIncluded > 1000 or numberOfAddressesIncluded == 0: return if len(data) != lengthOfNumberOfAddresses + (38 * numberOfAddressesIncluded): print 'addr message does not contain the correct amount of data. Ignoring.' return needToWriteKnownNodesToDisk = False for i in range(0, numberOfAddressesIncluded): try: if data[20 + lengthOfNumberOfAddresses + (38 * i):32 + lengthOfNumberOfAddresses + (38 * i)] != '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF': with shared.printLock: print 'Skipping IPv6 address.', repr(data[20 + lengthOfNumberOfAddresses + (38 * i):32 + lengthOfNumberOfAddresses + (38 * i)]) continue except Exception as err: with shared.printLock: sys.stderr.write( 'ERROR TRYING TO UNPACK recaddr (to test for an IPv6 address). Message: %s\n' % str(err)) break # giving up on unpacking any more. We should still be connected however. try: recaddrStream, = unpack('>I', data[8 + lengthOfNumberOfAddresses + ( 38 * i):12 + lengthOfNumberOfAddresses + (38 * i)]) except Exception as err: with shared.printLock: sys.stderr.write( 'ERROR TRYING TO UNPACK recaddr (recaddrStream). Message: %s\n' % str(err)) break # giving up on unpacking any more. We should still be connected however. if recaddrStream == 0: continue if recaddrStream != self.streamNumber and recaddrStream != (self.streamNumber * 2) and recaddrStream != ((self.streamNumber * 2) + 1): # if the embedded stream number is not in my stream or either of my child streams then ignore it. Someone might be trying funny business. continue try: recaddrServices, = unpack('>Q', data[12 + lengthOfNumberOfAddresses + ( 38 * i):20 + lengthOfNumberOfAddresses + (38 * i)]) except Exception as err: with shared.printLock: sys.stderr.write( 'ERROR TRYING TO UNPACK recaddr (recaddrServices). Message: %s\n' % str(err)) break # giving up on unpacking any more. We should still be connected however. try: recaddrPort, = unpack('>H', data[36 + lengthOfNumberOfAddresses + ( 38 * i):38 + lengthOfNumberOfAddresses + (38 * i)]) except Exception as err: with shared.printLock: sys.stderr.write( 'ERROR TRYING TO UNPACK recaddr (recaddrPort). Message: %s\n' % str(err)) break # giving up on unpacking any more. We should still be connected however. # print 'Within recaddr(): IP', recaddrIP, ', Port', # recaddrPort, ', i', i hostFromAddrMessage = socket.inet_ntoa(data[ 32 + lengthOfNumberOfAddresses + (38 * i):36 + lengthOfNumberOfAddresses + (38 * i)]) # print 'hostFromAddrMessage', hostFromAddrMessage if data[32 + lengthOfNumberOfAddresses + (38 * i)] == '\x7F': print 'Ignoring IP address in loopback range:', hostFromAddrMessage continue if data[32 + lengthOfNumberOfAddresses + (38 * i)] == '\x0A': print 'Ignoring IP address in private range:', hostFromAddrMessage continue if data[32 + lengthOfNumberOfAddresses + (38 * i):34 + lengthOfNumberOfAddresses + (38 * i)] == '\xC0A8': print 'Ignoring IP address in private range:', hostFromAddrMessage continue timeSomeoneElseReceivedMessageFromThisNode, = unpack('>Q', data[lengthOfNumberOfAddresses + ( 38 * i):8 + lengthOfNumberOfAddresses + (38 * i)]) # This is the 'time' value in the received addr message. 64-bit. if recaddrStream not in shared.knownNodes: # knownNodes is a dictionary of dictionaries with one outer dictionary for each stream. If the outer stream dictionary doesn't exist yet then we must make it. shared.knownNodesLock.acquire() shared.knownNodes[recaddrStream] = {} shared.knownNodesLock.release() peerFromAddrMessage = shared.Peer(hostFromAddrMessage, recaddrPort) if peerFromAddrMessage not in shared.knownNodes[recaddrStream]: if len(shared.knownNodes[recaddrStream]) < 20000 and timeSomeoneElseReceivedMessageFromThisNode > (int(time.time()) - 10800) and timeSomeoneElseReceivedMessageFromThisNode < (int(time.time()) + 10800): # If we have more than 20000 nodes in our list already then just forget about adding more. Also, make sure that the time that someone else received a message from this node is within three hours from now. shared.knownNodesLock.acquire() shared.knownNodes[recaddrStream][peerFromAddrMessage] = ( timeSomeoneElseReceivedMessageFromThisNode) shared.knownNodesLock.release() with shared.printLock: print 'added new node', peerFromAddrMessage, 'to knownNodes in stream', recaddrStream needToWriteKnownNodesToDisk = True hostDetails = ( timeSomeoneElseReceivedMessageFromThisNode, recaddrStream, recaddrServices, hostFromAddrMessage, recaddrPort) listOfAddressDetailsToBroadcastToPeers.append( hostDetails) else: timeLastReceivedMessageFromThisNode = shared.knownNodes[recaddrStream][ peerFromAddrMessage] # PORT in this case is either the port we used to connect to the remote node, or the port that was specified by someone else in a past addr message. if (timeLastReceivedMessageFromThisNode < timeSomeoneElseReceivedMessageFromThisNode) and (timeSomeoneElseReceivedMessageFromThisNode < int(time.time())): shared.knownNodesLock.acquire() shared.knownNodes[recaddrStream][peerFromAddrMessage] = timeSomeoneElseReceivedMessageFromThisNode shared.knownNodesLock.release() if needToWriteKnownNodesToDisk: # Runs if any nodes were new to us. Also, share those nodes with our peers. shared.knownNodesLock.acquire() output = open(shared.appdata + 'knownnodes.dat', 'wb') pickle.dump(shared.knownNodes, output) output.close() shared.knownNodesLock.release() self.broadcastaddr(listOfAddressDetailsToBroadcastToPeers) with shared.printLock: print 'knownNodes currently has', len(shared.knownNodes[self.streamNumber]), 'nodes for this stream.' # Function runs when we want to broadcast an addr message to all of our # peers. Runs when we learn of nodes that we didn't previously know about # and want to share them with our peers. def broadcastaddr(self, listOfAddressDetailsToBroadcastToPeers): numberOfAddressesInAddrMessage = len( listOfAddressDetailsToBroadcastToPeers) payload = '' for hostDetails in listOfAddressDetailsToBroadcastToPeers: timeLastReceivedMessageFromThisNode, streamNumber, services, host, port = hostDetails payload += pack( '>Q', timeLastReceivedMessageFromThisNode) # now uses 64-bit time payload += pack('>I', streamNumber) payload += pack( '>q', services) # service bit flags offered by this node payload += '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF' + \ socket.inet_aton(host) payload += pack('>H', port) # remote port payload = encodeVarint(numberOfAddressesInAddrMessage) + payload datatosend = '\xE9\xBE\xB4\xD9addr\x00\x00\x00\x00\x00\x00\x00\x00' datatosend = datatosend + pack('>L', len(payload)) # payload length datatosend = datatosend + hashlib.sha512(payload).digest()[0:4] datatosend = datatosend + payload if shared.verbose >= 1: with shared.printLock: print 'Broadcasting addr with', numberOfAddressesInAddrMessage, 'entries.' shared.broadcastToSendDataQueues(( self.streamNumber, 'sendaddr', datatosend)) # Send a big addr message to our peer def sendaddr(self): addrsInMyStream = {} addrsInChildStreamLeft = {} addrsInChildStreamRight = {} # print 'knownNodes', shared.knownNodes # We are going to share a maximum number of 1000 addrs with our peer. # 500 from this stream, 250 from the left child stream, and 250 from # the right child stream. shared.knownNodesLock.acquire() if len(shared.knownNodes[self.streamNumber]) > 0: for i in range(500): random.seed() peer, = random.sample(shared.knownNodes[self.streamNumber], 1) if helper_generic.isHostInPrivateIPRange(peer.host): continue addrsInMyStream[peer] = shared.knownNodes[ self.streamNumber][peer] if len(shared.knownNodes[self.streamNumber * 2]) > 0: for i in range(250): random.seed() peer, = random.sample(shared.knownNodes[ self.streamNumber * 2], 1) if helper_generic.isHostInPrivateIPRange(peer.host): continue addrsInChildStreamLeft[peer] = shared.knownNodes[ self.streamNumber * 2][peer] if len(shared.knownNodes[(self.streamNumber * 2) + 1]) > 0: for i in range(250): random.seed() peer, = random.sample(shared.knownNodes[ (self.streamNumber * 2) + 1], 1) if helper_generic.isHostInPrivateIPRange(peer.host): continue addrsInChildStreamRight[peer] = shared.knownNodes[ (self.streamNumber * 2) + 1][peer] shared.knownNodesLock.release() numberOfAddressesInAddrMessage = 0 payload = '' # print 'addrsInMyStream.items()', addrsInMyStream.items() for (HOST, PORT), value in addrsInMyStream.items(): timeLastReceivedMessageFromThisNode = value if timeLastReceivedMessageFromThisNode > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers): # If it is younger than 3 hours old.. numberOfAddressesInAddrMessage += 1 payload += pack( '>Q', timeLastReceivedMessageFromThisNode) # 64-bit time payload += pack('>I', self.streamNumber) payload += pack( '>q', 1) # service bit flags offered by this node payload += '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF' + \ socket.inet_aton(HOST) payload += pack('>H', PORT) # remote port for (HOST, PORT), value in addrsInChildStreamLeft.items(): timeLastReceivedMessageFromThisNode = value if timeLastReceivedMessageFromThisNode > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers): # If it is younger than 3 hours old.. numberOfAddressesInAddrMessage += 1 payload += pack( '>Q', timeLastReceivedMessageFromThisNode) # 64-bit time payload += pack('>I', self.streamNumber * 2) payload += pack( '>q', 1) # service bit flags offered by this node payload += '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF' + \ socket.inet_aton(HOST) payload += pack('>H', PORT) # remote port for (HOST, PORT), value in addrsInChildStreamRight.items(): timeLastReceivedMessageFromThisNode = value if timeLastReceivedMessageFromThisNode > (int(time.time()) - shared.maximumAgeOfNodesThatIAdvertiseToOthers): # If it is younger than 3 hours old.. numberOfAddressesInAddrMessage += 1 payload += pack( '>Q', timeLastReceivedMessageFromThisNode) # 64-bit time payload += pack('>I', (self.streamNumber * 2) + 1) payload += pack( '>q', 1) # service bit flags offered by this node payload += '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF' + \ socket.inet_aton(HOST) payload += pack('>H', PORT) # remote port payload = encodeVarint(numberOfAddressesInAddrMessage) + payload datatosend = '\xE9\xBE\xB4\xD9addr\x00\x00\x00\x00\x00\x00\x00\x00' datatosend = datatosend + pack('>L', len(payload)) # payload length datatosend = datatosend + hashlib.sha512(payload).digest()[0:4] datatosend = datatosend + payload try: self.sock.sendall(datatosend) if shared.verbose >= 1: with shared.printLock: print 'Sending addr with', numberOfAddressesInAddrMessage, 'entries.' except Exception as err: # if not 'Bad file descriptor' in err: with shared.printLock: print 'sock.sendall error:', err # We have received a version message def recversion(self, data): if len(data) < 83: # This version message is unreasonably short. Forget it. return elif not self.verackSent: self.remoteProtocolVersion, = unpack('>L', data[:4]) if self.remoteProtocolVersion <= 1: shared.broadcastToSendDataQueues((0, 'shutdown', self.peer)) with shared.printLock: print 'Closing connection to old protocol version 1 node: ', self.peer return # print 'remoteProtocolVersion', self.remoteProtocolVersion self.myExternalIP = socket.inet_ntoa(data[40:44]) # print 'myExternalIP', self.myExternalIP self.remoteNodeIncomingPort, = unpack('>H', data[70:72]) # print 'remoteNodeIncomingPort', self.remoteNodeIncomingPort useragentLength, lengthOfUseragentVarint = decodeVarint( data[80:84]) readPosition = 80 + lengthOfUseragentVarint useragent = data[readPosition:readPosition + useragentLength] readPosition += useragentLength numberOfStreamsInVersionMessage, lengthOfNumberOfStreamsInVersionMessage = decodeVarint( data[readPosition:]) readPosition += lengthOfNumberOfStreamsInVersionMessage self.streamNumber, lengthOfRemoteStreamNumber = decodeVarint( data[readPosition:]) with shared.printLock: print 'Remote node useragent:', useragent, ' stream number:', self.streamNumber if self.streamNumber != 1: shared.broadcastToSendDataQueues((0, 'shutdown', self.peer)) with shared.printLock: print 'Closed connection to', self.peer, 'because they are interested in stream', self.streamNumber, '.' return shared.connectedHostsList[ self.peer.host] = 1 # We use this data structure to not only keep track of what hosts we are connected to so that we don't try to connect to them again, but also to list the connections count on the Network Status tab. # If this was an incoming connection, then the sendData thread # doesn't know the stream. We have to set it. if not self.initiatedConnection: shared.broadcastToSendDataQueues(( 0, 'setStreamNumber', (self.peer, self.streamNumber))) if data[72:80] == shared.eightBytesOfRandomDataUsedToDetectConnectionsToSelf: shared.broadcastToSendDataQueues((0, 'shutdown', self.peer)) with shared.printLock: print 'Closing connection to myself: ', self.peer return shared.broadcastToSendDataQueues((0, 'setRemoteProtocolVersion', ( self.peer, self.remoteProtocolVersion))) shared.knownNodesLock.acquire() shared.knownNodes[self.streamNumber][self.peer] = int(time.time()) output = open(shared.appdata + 'knownnodes.dat', 'wb') pickle.dump(shared.knownNodes, output) output.close() shared.knownNodesLock.release() self.sendverack() if self.initiatedConnection == False: self.sendversion() # Sends a version message def sendversion(self): with shared.printLock: print 'Sending version message' try: self.sock.sendall(shared.assembleVersionMessage( self.peer.host, self.peer.port, self.streamNumber)) except Exception as err: # if not 'Bad file descriptor' in err: with shared.printLock: print 'sock.sendall error:', err # Sends a verack message def sendverack(self): with shared.printLock: print 'Sending verack' try: self.sock.sendall( '\xE9\xBE\xB4\xD9\x76\x65\x72\x61\x63\x6B\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xcf\x83\xe1\x35') except Exception as err: # if not 'Bad file descriptor' in err: with shared.printLock: print 'sock.sendall error:', err # cf # 83 # e1 # 35 self.verackSent = True if self.verackReceived: self.connectionFullyEstablished()