def processbroadcast(self, data): messageProcessingStartTime = time.time() shared.numberOfBroadcastsProcessed += 1 shared.UISignalQueue.put( ('updateNumberOfBroadcastsProcessed', 'no data')) inventoryHash = calculateInventoryHash(data) readPosition = 20 # bypass the nonce, time, and object type broadcastVersion, broadcastVersionLength = decodeVarint( data[readPosition:readPosition + 9]) readPosition += broadcastVersionLength if broadcastVersion < 4 or broadcastVersion > 5: logger.info( 'Cannot decode incoming broadcast versions less than 4 or higher than 5. Assuming the sender isn\'t being silly, you should upgrade Bitmessage because this message shall be ignored.' ) return cleartextStreamNumber, cleartextStreamNumberLength = decodeVarint( data[readPosition:readPosition + 10]) readPosition += cleartextStreamNumberLength if broadcastVersion == 4: """ v4 broadcasts are encrypted the same way the msgs are encrypted. To see if we are interested in a v4 broadcast, we try to decrypt it. This was replaced with v5 broadcasts which include a tag which we check instead, just like we do with v4 pubkeys. """ signedData = data[8:readPosition] 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 logger.info( 'EC decryption successful using key associated with ripe hash: %s' % 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. logger.debug( 'Length of time program spent failing to decrypt this v4 broadcast: %s seconds.' % (time.time() - messageProcessingStartTime, )) return elif broadcastVersion == 5: embeddedTag = data[readPosition:readPosition + 32] readPosition += 32 if embeddedTag not in shared.MyECSubscriptionCryptorObjects: logger.debug('We\'re not interested in this broadcast.') return # We are interested in this broadcast because of its tag. signedData = data[ 8: readPosition] # We're going to add some more data which is signed further down. cryptorObject = shared.MyECSubscriptionCryptorObjects[embeddedTag] try: decryptedData = cryptorObject.decrypt(data[readPosition:]) logger.debug('EC decryption successful') except Exception as err: logger.debug('Broadcast version %s decryption Unsuccessful.' % broadcastVersion) return # At this point this is a broadcast I have decrypted and am # interested in. readPosition = 0 sendersAddressVersion, sendersAddressVersionLength = decodeVarint( decryptedData[readPosition:readPosition + 9]) if broadcastVersion == 4: if sendersAddressVersion < 2 or sendersAddressVersion > 3: logger.warning( '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 elif broadcastVersion == 5: if sendersAddressVersion < 4: logger.info( 'Cannot decode senderAddressVersion less than 4 for broadcast version number 5. 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: logger.info( '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 logger.debug( 'sender\'s requiredAverageProofOfWorkNonceTrialsPerByte is %s' % requiredAverageProofOfWorkNonceTrialsPerByte) requiredPayloadLengthExtraBytes, varintLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += varintLength logger.debug('sender\'s requiredPayloadLengthExtraBytes is %s' % requiredPayloadLengthExtraBytes) endOfPubkeyPosition = readPosition sha = hashlib.new('sha512') sha.update(sendersPubSigningKey + sendersPubEncryptionKey) ripeHasher = hashlib.new('ripemd160') ripeHasher.update(sha.digest()) calculatedRipe = ripeHasher.digest() if broadcastVersion == 4: if toRipe != calculatedRipe: logger.info( 'The encryption key used to encrypt this message doesn\'t match the keys inbedded in the message itself. Ignoring message.' ) return elif broadcastVersion == 5: calculatedTag = hashlib.sha512( hashlib.sha512( encodeVarint(sendersAddressVersion) + encodeVarint(sendersStream) + calculatedRipe).digest()).digest()[32:] if calculatedTag != embeddedTag: logger.debug( 'The tag and 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] signedData += decryptedData[:readPositionAtBottomOfMessage] if not highlevelcrypto.verify(signedData, signature, sendersPubSigningKey.encode('hex')): logger.debug('ECDSA verify failed') return logger.debug('ECDSA verify passed') fromAddress = encodeAddress(sendersAddressVersion, sendersStream, calculatedRipe) logger.info('fromAddress: %s' % fromAddress) # Let's store the public key in case we want to reply to this person. sqlExecute('''INSERT INTO pubkeys VALUES (?,?,?,?,?)''', calculatedRipe, sendersAddressVersion, decryptedData[:endOfPubkeyPosition], int(time.time()), 'yes') # 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. if broadcastVersion == 4: self.possibleNewPubkey(ripe=calculatedRipe) elif broadcastVersion == 5: self.possibleNewPubkey(address=fromAddress) fromAddress = encodeAddress(sendersAddressVersion, sendersStream, calculatedRipe) with shared.printLock: print 'fromAddress:', fromAddress if messageEncodingType == 2: subject, body = self.decodeType2Message(message) logger.info('Broadcast subject (first 100 characters): %s' % repr(subject)[:100]) elif messageEncodingType == 1: body = message subject = '' elif messageEncodingType == 0: logger.info( 'messageEncodingType == 0. Doing nothing with the message.') else: body = 'Unknown encoding type.\n\n' + repr(message) subject = '' toAddress = '[Broadcast subscribers]' if messageEncodingType != 0: if helper_inbox.isMessageAlreadyInInbox(toAddress, fromAddress, subject, body, messageEncodingType): logger.info( 'This broadcast is already in our inbox. Ignoring it.') else: t = (inventoryHash, toAddress, fromAddress, subject, int(time.time()), body, 'inbox', messageEncodingType, 0) helper_inbox.insert(t) shared.UISignalQueue.put( ('displayNewInboxMessage', (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 logger.info('Time spent processing this interesting broadcast: %s' % (time.time() - messageProcessingStartTime, ))
def processmsg(self, data): messageProcessingStartTime = time.time() shared.numberOfMessagesProcessed += 1 shared.UISignalQueue.put( ('updateNumberOfMessagesProcessed', 'no data')) readPosition = 20 # bypass the nonce, time, and object type msgVersion, msgVersionLength = decodeVarint( data[readPosition:readPosition + 9]) if msgVersion != 1: logger.info( 'Cannot understand message versions other than one. Ignoring message.' ) return readPosition += msgVersionLength streamNumberAsClaimedByMsg, streamNumberAsClaimedByMsgLength = decodeVarint( data[readPosition:readPosition + 9]) readPosition += streamNumberAsClaimedByMsgLength inventoryHash = calculateInventoryHash(data) initialDecryptionSuccessful = False # Let's check whether this is a message acknowledgement bound for us. if data[-32:] in shared.ackdataForWhichImWatching: logger.info('This msg IS an acknowledgement bound for me.') del shared.ackdataForWhichImWatching[data[-32:]] sqlExecute('UPDATE sent SET status=? WHERE ackdata=?', 'ackreceived', data[-32:]) shared.UISignalQueue.put( ('updateSentItemStatusByAckdata', (data[-32:], tr.translateText( "MainWindow", 'Acknowledgement of the message received. %1').arg( l10n.formatTimestamp())))) return else: logger.info('This was NOT an acknowledgement bound for me.') # 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(data[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 logger.info( 'EC decryption successful using key associated with ripe hash: %s.' % key.encode('hex')) break except Exception as err: pass if not initialDecryptionSuccessful: # This is not a message bound for me. logger.info( 'Length of time program spent failing to decrypt this message: %s seconds.' % (time.time() - messageProcessingStartTime, )) return # This is a message bound for me. toAddress = shared.myAddressesByHash[ toRipe] # Look up my address based on the RIPE hash. readPosition = 0 sendersAddressVersionNumber, sendersAddressVersionNumberLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += sendersAddressVersionNumberLength if sendersAddressVersionNumber == 0: logger.info( 'Cannot understand sendersAddressVersionNumber = 0. Ignoring message.' ) return if sendersAddressVersionNumber > 4: logger.info( 'Sender\'s address version number %s not yet supported. Ignoring message.' % sendersAddressVersionNumber) return if len(decryptedData) < 170: logger.info( 'Length of the unencrypted data is unreasonably short. Sanity check failed. Ignoring message.' ) return sendersStreamNumber, sendersStreamNumberLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) if sendersStreamNumber == 0: logger.info('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 logger.info( 'sender\'s requiredAverageProofOfWorkNonceTrialsPerByte is %s' % requiredAverageProofOfWorkNonceTrialsPerByte) requiredPayloadLengthExtraBytes, varintLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += varintLength logger.info('sender\'s requiredPayloadLengthExtraBytes is %s' % requiredPayloadLengthExtraBytes) endOfThePublicKeyPosition = readPosition # needed for when we store the pubkey in our database of pubkeys for later use. if toRipe != decryptedData[readPosition:readPosition + 20]: logger.info( 'The original sender of this message did not send it to you. Someone is attempting a Surreptitious Forwarding Attack.\n\ See: http://world.std.com/~dtd/sign_encrypt/sign_encrypt7.html \n\ your toRipe: %s\n\ embedded destination toRipe: %s' % (toRipe.encode('hex'), 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] signedData = data[8:20] + encodeVarint( 1) + encodeVarint(streamNumberAsClaimedByMsg ) + decryptedData[:positionOfBottomOfAckData] if not highlevelcrypto.verify(signedData, signature, pubSigningKey.encode('hex')): logger.debug('ECDSA verify failed') return logger.debug('ECDSA verify passed') logger.debug( 'As a matter of intellectual curiosity, here is the Bitcoin address associated with the keys owned by the other person: %s ..and here is the testnet address: %s. 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.' % (helper_bitcoin.calculateBitcoinAddressFromPubkey(pubSigningKey), helper_bitcoin.calculateTestnetAddressFromPubkey(pubSigningKey))) # calculate the fromRipe. sha = hashlib.new('sha512') sha.update(pubSigningKey + pubEncryptionKey) ripe = hashlib.new('ripemd160') ripe.update(sha.digest()) fromAddress = encodeAddress(sendersAddressVersionNumber, sendersStreamNumber, ripe.digest()) # Let's store the public key in case we want to reply to this # person. sqlExecute('''INSERT INTO pubkeys VALUES (?,?,?,?,?)''', ripe.digest(), sendersAddressVersionNumber, decryptedData[:endOfThePublicKeyPosition], int(time.time()), 'yes') # 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. if sendersAddressVersionNumber <= 3: self.possibleNewPubkey(ripe=ripe.digest()) elif sendersAddressVersionNumber >= 4: self.possibleNewPubkey(address=fromAddress) # 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 this is bound for one of my chan # addresses then we skip this check; the minimum network POW is # fine. if decodeAddress(toAddress)[1] >= 3 and not shared.safeConfigGetBoolean( toAddress, 'chan' ): # If the toAddress version number is 3 or higher and not one of my chan addresses: 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 shared.isProofOfWorkSufficient( data, requiredNonceTrialsPerByte, requiredPayloadLengthExtraBytes): logger.info( 'Proof of work in msg is 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 != []: logger.info('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' ''', fromAddress) if queryreturn == []: logger.info( 'Message ignored because address not in whitelist.') blockMessage = True toLabel = shared.config.get(toAddress, 'label') if toLabel == '': toLabel = toAddress if messageEncodingType == 2: subject, body = self.decodeType2Message(message) logger.info('Message subject (first 100 characters): %s' % repr(subject)[:100]) elif messageEncodingType == 1: body = message subject = '' elif messageEncodingType == 0: logger.info( '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.' ) subject = '' body = '' else: body = 'Unknown encoding type.\n\n' + repr(message) subject = '' # Let us make sure that we haven't already received this message if helper_inbox.isMessageAlreadyInInbox(toAddress, fromAddress, subject, body, messageEncodingType): logger.info('This msg is already in our inbox. Ignoring it.') blockMessage = True if not blockMessage: if messageEncodingType != 0: t = (inventoryHash, toAddress, fromAddress, subject, int(time.time()), body, 'inbox', messageEncodingType, 0) helper_inbox.insert(t) shared.UISignalQueue.put( ('displayNewInboxMessage', (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. ackdataForBroadcast = OpenSSL.rand( 32 ) # We don't actually need the ackdataForBroadcast 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, ackdataForBroadcast, int(time.time()), 'broadcastqueued', 1, 1, 'sent', 2) helper_sent.insert(t) shared.UISignalQueue.put( ('displayNewSentMessage', (toAddress, '[Broadcast subscribers]', fromAddress, subject, message, ackdataForBroadcast))) shared.workerQueue.put(('sendbroadcast', '')) if self.ackDataHasAVaildHeader(ackData): shared.checkAndShareObjectWithPeers(ackData[24:]) # Display timing data timeRequiredToAttemptToDecryptMessage = time.time( ) - messageProcessingStartTime shared.successfullyDecryptMessageTimings.append( timeRequiredToAttemptToDecryptMessage) sum = 0 for item in shared.successfullyDecryptMessageTimings: sum += item logger.debug('Time to decrypt this message successfully: %s\n\ Average time for all message decryption successes since startup: %s.' % (timeRequiredToAttemptToDecryptMessage, sum / len(shared.successfullyDecryptMessageTimings)))
def processmsg(self, data): messageProcessingStartTime = time.time() shared.numberOfMessagesProcessed += 1 queues.UISignalQueue.put(( 'updateNumberOfMessagesProcessed', 'no data')) readPosition = 20 # bypass the nonce, time, and object type msgVersion, msgVersionLength = decodeVarint(data[readPosition:readPosition + 9]) if msgVersion != 1: logger.info('Cannot understand message versions other than one. Ignoring message.') return readPosition += msgVersionLength streamNumberAsClaimedByMsg, streamNumberAsClaimedByMsgLength = decodeVarint( data[readPosition:readPosition + 9]) readPosition += streamNumberAsClaimedByMsgLength inventoryHash = calculateInventoryHash(data) initialDecryptionSuccessful = False # 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: if initialDecryptionSuccessful: # continue decryption attempts to avoid timing attacks cryptorObject.decrypt(data[readPosition:]) else: decryptedData = cryptorObject.decrypt(data[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 logger.info('EC decryption successful using key associated with ripe hash: %s.' % hexlify(key)) except Exception as err: pass if not initialDecryptionSuccessful: # This is not a message bound for me. logger.info('Length of time program spent failing to decrypt this message: %s seconds.' % (time.time() - messageProcessingStartTime,)) return # This is a message bound for me. toAddress = shared.myAddressesByHash[ toRipe] # Look up my address based on the RIPE hash. readPosition = 0 sendersAddressVersionNumber, sendersAddressVersionNumberLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += sendersAddressVersionNumberLength if sendersAddressVersionNumber == 0: logger.info('Cannot understand sendersAddressVersionNumber = 0. Ignoring message.') return if sendersAddressVersionNumber > 4: logger.info('Sender\'s address version number %s not yet supported. Ignoring message.' % sendersAddressVersionNumber) return if len(decryptedData) < 170: logger.info('Length of the unencrypted data is unreasonably short. Sanity check failed. Ignoring message.') return sendersStreamNumber, sendersStreamNumberLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) if sendersStreamNumber == 0: logger.info('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 logger.info('sender\'s requiredAverageProofOfWorkNonceTrialsPerByte is %s' % requiredAverageProofOfWorkNonceTrialsPerByte) requiredPayloadLengthExtraBytes, varintLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += varintLength logger.info('sender\'s requiredPayloadLengthExtraBytes is %s' % requiredPayloadLengthExtraBytes) endOfThePublicKeyPosition = readPosition # needed for when we store the pubkey in our database of pubkeys for later use. if toRipe != decryptedData[readPosition:readPosition + 20]: logger.info('The original sender of this message did not send it to you. Someone is attempting a Surreptitious Forwarding Attack.\n\ See: http://world.std.com/~dtd/sign_encrypt/sign_encrypt7.html \n\ your toRipe: %s\n\ embedded destination toRipe: %s' % (hexlify(toRipe), hexlify(decryptedData[readPosition:readPosition + 20])) ) 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] signedData = data[8:20] + encodeVarint(1) + encodeVarint(streamNumberAsClaimedByMsg) + decryptedData[:positionOfBottomOfAckData] if not highlevelcrypto.verify(signedData, signature, hexlify(pubSigningKey)): logger.debug('ECDSA verify failed') return logger.debug('ECDSA verify passed') sigHash = hashlib.sha512(hashlib.sha512(signature).digest()).digest()[32:] # Used to detect and ignore duplicate messages in our inbox # calculate the fromRipe. sha = hashlib.new('sha512') sha.update(pubSigningKey + pubEncryptionKey) ripe = hashlib.new('ripemd160') ripe.update(sha.digest()) fromAddress = encodeAddress( sendersAddressVersionNumber, sendersStreamNumber, ripe.digest()) # Let's store the public key in case we want to reply to this # person. sqlExecute( '''INSERT INTO pubkeys VALUES (?,?,?,?,?)''', fromAddress, sendersAddressVersionNumber, decryptedData[:endOfThePublicKeyPosition], int(time.time()), 'yes') # 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(fromAddress) # 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 this is bound for one of my chan # addresses then we skip this check; the minimum network POW is # fine. if decodeAddress(toAddress)[1] >= 3 and not BMConfigParser().safeGetBoolean(toAddress, 'chan'): # If the toAddress version number is 3 or higher and not one of my chan addresses: if not shared.isAddressInMyAddressBookSubscriptionsListOrWhitelist(fromAddress): # If I'm not friendly with this person: requiredNonceTrialsPerByte = BMConfigParser().getint( toAddress, 'noncetrialsperbyte') requiredPayloadLengthExtraBytes = BMConfigParser().getint( toAddress, 'payloadlengthextrabytes') if not protocol.isProofOfWorkSufficient(data, requiredNonceTrialsPerByte, requiredPayloadLengthExtraBytes): logger.info('Proof of work in msg is 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 BMConfigParser().get('bitmessagesettings', 'blackwhitelist') == 'black': # If we are using a blacklist queryreturn = sqlQuery( '''SELECT label FROM blacklist where address=? and enabled='1' ''', fromAddress) if queryreturn != []: logger.info('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' ''', fromAddress) if queryreturn == []: logger.info('Message ignored because address not in whitelist.') blockMessage = True toLabel = BMConfigParser().get(toAddress, 'label') if toLabel == '': toLabel = toAddress decodedMessage = helper_msgcoding.MsgDecode(messageEncodingType, message) subject = decodedMessage.subject body = decodedMessage.body # Let us make sure that we haven't already received this message if helper_inbox.isMessageAlreadyInInbox(sigHash): logger.info('This msg is already in our inbox. Ignoring it.') blockMessage = True if not blockMessage: if messageEncodingType != 0: t = (inventoryHash, toAddress, fromAddress, subject, int( time.time()), body, 'inbox', messageEncodingType, 0, sigHash) helper_inbox.insert(t) queues.UISignalQueue.put(('displayNewInboxMessage', ( 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 BMConfigParser().safeGetBoolean('bitmessagesettings', 'apienabled'): try: apiNotifyPath = BMConfigParser().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 BMConfigParser().safeGetBoolean(toAddress, 'mailinglist') and messageEncodingType != 0: try: mailingListName = BMConfigParser().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. ackdataForBroadcast = OpenSSL.rand( 32) # We don't actually need the ackdataForBroadcast 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 = '' # We really should have a discussion about how to # set the TTL for mailing list broadcasts. This is obviously # hard-coded. TTL = 2*7*24*60*60 # 2 weeks t = ('', toAddress, ripe, fromAddress, subject, message, ackdataForBroadcast, int(time.time()), # sentTime (this doesn't change) int(time.time()), # lastActionTime 0, 'broadcastqueued', 0, 'sent', messageEncodingType, TTL) helper_sent.insert(t) queues.UISignalQueue.put(('displayNewSentMessage', ( toAddress, '[Broadcast subscribers]', fromAddress, subject, message, ackdataForBroadcast))) queues.workerQueue.put(('sendbroadcast', '')) # Don't send ACK if invalid, blacklisted senders, invisible messages, disabled or chan if self.ackDataHasAValidHeader(ackData) and \ not blockMessage and \ messageEncodingType != 0 and \ not BMConfigParser().safeGetBoolean(toAddress, 'dontsendack') and \ not BMConfigParser().safeGetBoolean(toAddress, 'chan'): shared.checkAndShareObjectWithPeers(ackData[24:]) # Display timing data timeRequiredToAttemptToDecryptMessage = time.time( ) - messageProcessingStartTime shared.successfullyDecryptMessageTimings.append( timeRequiredToAttemptToDecryptMessage) sum = 0 for item in shared.successfullyDecryptMessageTimings: sum += item logger.debug('Time to decrypt this message successfully: %s\n\ Average time for all message decryption successes since startup: %s.' % (timeRequiredToAttemptToDecryptMessage, sum / len(shared.successfullyDecryptMessageTimings)) )
def processbroadcast(self, data): messageProcessingStartTime = time.time() shared.numberOfBroadcastsProcessed += 1 shared.UISignalQueue.put(( 'updateNumberOfBroadcastsProcessed', 'no data')) inventoryHash = calculateInventoryHash(data) readPosition = 20 # bypass the nonce, time, and object type broadcastVersion, broadcastVersionLength = decodeVarint( data[readPosition:readPosition + 9]) readPosition += broadcastVersionLength if broadcastVersion < 4 or broadcastVersion > 5: logger.info('Cannot decode incoming broadcast versions less than 4 or higher than 5. Assuming the sender isn\'t being silly, you should upgrade Bitmessage because this message shall be ignored.') return cleartextStreamNumber, cleartextStreamNumberLength = decodeVarint( data[readPosition:readPosition + 10]) readPosition += cleartextStreamNumberLength if broadcastVersion == 4: """ v4 broadcasts are encrypted the same way the msgs are encrypted. To see if we are interested in a v4 broadcast, we try to decrypt it. This was replaced with v5 broadcasts which include a tag which we check instead, just like we do with v4 pubkeys. """ signedData = data[8:readPosition] 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 logger.info('EC decryption successful using key associated with ripe hash: %s' % 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. logger.debug('Length of time program spent failing to decrypt this v4 broadcast: %s seconds.' % (time.time() - messageProcessingStartTime,)) return elif broadcastVersion == 5: embeddedTag = data[readPosition:readPosition+32] readPosition += 32 if embeddedTag not in shared.MyECSubscriptionCryptorObjects: logger.debug('We\'re not interested in this broadcast.') return # We are interested in this broadcast because of its tag. signedData = data[8:readPosition] # We're going to add some more data which is signed further down. cryptorObject = shared.MyECSubscriptionCryptorObjects[embeddedTag] try: decryptedData = cryptorObject.decrypt(data[readPosition:]) logger.debug('EC decryption successful') except Exception as err: logger.debug('Broadcast version %s decryption Unsuccessful.' % broadcastVersion) return # At this point this is a broadcast I have decrypted and am # interested in. readPosition = 0 sendersAddressVersion, sendersAddressVersionLength = decodeVarint( decryptedData[readPosition:readPosition + 9]) if broadcastVersion == 4: if sendersAddressVersion < 2 or sendersAddressVersion > 3: logger.warning('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 elif broadcastVersion == 5: if sendersAddressVersion < 4: logger.info('Cannot decode senderAddressVersion less than 4 for broadcast version number 5. 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: logger.info('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 logger.debug('sender\'s requiredAverageProofOfWorkNonceTrialsPerByte is %s' % requiredAverageProofOfWorkNonceTrialsPerByte) requiredPayloadLengthExtraBytes, varintLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += varintLength logger.debug('sender\'s requiredPayloadLengthExtraBytes is %s' % requiredPayloadLengthExtraBytes) endOfPubkeyPosition = readPosition sha = hashlib.new('sha512') sha.update(sendersPubSigningKey + sendersPubEncryptionKey) ripeHasher = hashlib.new('ripemd160') ripeHasher.update(sha.digest()) calculatedRipe = ripeHasher.digest() if broadcastVersion == 4: if toRipe != calculatedRipe: logger.info('The encryption key used to encrypt this message doesn\'t match the keys inbedded in the message itself. Ignoring message.') return elif broadcastVersion == 5: calculatedTag = hashlib.sha512(hashlib.sha512(encodeVarint( sendersAddressVersion) + encodeVarint(sendersStream) + calculatedRipe).digest()).digest()[32:] if calculatedTag != embeddedTag: logger.debug('The tag and 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] signedData += decryptedData[:readPositionAtBottomOfMessage] if not highlevelcrypto.verify(signedData, signature, sendersPubSigningKey.encode('hex')): logger.debug('ECDSA verify failed') return logger.debug('ECDSA verify passed') sigHash = hashlib.sha512(hashlib.sha512(signature).digest()).digest()[32:] # Used to detect and ignore duplicate messages in our inbox fromAddress = encodeAddress( sendersAddressVersion, sendersStream, calculatedRipe) logger.info('fromAddress: %s' % fromAddress) # Let's store the public key in case we want to reply to this person. sqlExecute('''INSERT INTO pubkeys VALUES (?,?,?,?,?)''', fromAddress, sendersAddressVersion, decryptedData[:endOfPubkeyPosition], int(time.time()), 'yes') # 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(fromAddress) fromAddress = encodeAddress( sendersAddressVersion, sendersStream, calculatedRipe) logger.debug('fromAddress: ' + fromAddress) if messageEncodingType == 2: subject, body = self.decodeType2Message(message) logger.info('Broadcast subject (first 100 characters): %s' % repr(subject)[:100]) elif messageEncodingType == 1: body = message subject = '' elif messageEncodingType == 0: logger.info('messageEncodingType == 0. Doing nothing with the message.') return else: body = 'Unknown encoding type.\n\n' + repr(message) subject = '' toAddress = '[Broadcast subscribers]' if helper_inbox.isMessageAlreadyInInbox(sigHash): logger.info('This broadcast is already in our inbox. Ignoring it.') return t = (inventoryHash, toAddress, fromAddress, subject, int( time.time()), body, 'inbox', messageEncodingType, 0, sigHash) helper_inbox.insert(t) shared.UISignalQueue.put(('displayNewInboxMessage', ( 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 logger.info('Time spent processing this interesting broadcast: %s' % (time.time() - messageProcessingStartTime,))
def processmsg(self, data): messageProcessingStartTime = time.time() shared.numberOfMessagesProcessed += 1 shared.UISignalQueue.put(( 'updateNumberOfMessagesProcessed', 'no data')) readPosition = 20 # bypass the nonce, time, and object type msgVersion, msgVersionLength = decodeVarint(data[readPosition:readPosition + 9]) if msgVersion != 1: logger.info('Cannot understand message versions other than one. Ignoring message.') return readPosition += msgVersionLength streamNumberAsClaimedByMsg, streamNumberAsClaimedByMsgLength = decodeVarint( data[readPosition:readPosition + 9]) readPosition += streamNumberAsClaimedByMsgLength inventoryHash = calculateInventoryHash(data) initialDecryptionSuccessful = False # Let's check whether this is a message acknowledgement bound for us. if data[-32:] in shared.ackdataForWhichImWatching: logger.info('This msg IS an acknowledgement bound for me.') del shared.ackdataForWhichImWatching[data[-32:]] sqlExecute('UPDATE sent SET status=?, lastactiontime=? WHERE ackdata=?', 'ackreceived', int(time.time()), data[-32:]) shared.UISignalQueue.put(('updateSentItemStatusByAckdata', (data[-32:], tr.translateText("MainWindow",'Acknowledgement of the message received. %1').arg(l10n.formatTimestamp())))) return else: logger.info('This was NOT an acknowledgement bound for me.') # 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(data[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 logger.info('EC decryption successful using key associated with ripe hash: %s.' % key.encode('hex')) break except Exception as err: pass if not initialDecryptionSuccessful: # This is not a message bound for me. logger.info('Length of time program spent failing to decrypt this message: %s seconds.' % (time.time() - messageProcessingStartTime,)) return # This is a message bound for me. toAddress = shared.myAddressesByHash[ toRipe] # Look up my address based on the RIPE hash. readPosition = 0 sendersAddressVersionNumber, sendersAddressVersionNumberLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += sendersAddressVersionNumberLength if sendersAddressVersionNumber == 0: logger.info('Cannot understand sendersAddressVersionNumber = 0. Ignoring message.') return if sendersAddressVersionNumber > 4: logger.info('Sender\'s address version number %s not yet supported. Ignoring message.' % sendersAddressVersionNumber) return if len(decryptedData) < 170: logger.info('Length of the unencrypted data is unreasonably short. Sanity check failed. Ignoring message.') return sendersStreamNumber, sendersStreamNumberLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) if sendersStreamNumber == 0: logger.info('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 logger.info('sender\'s requiredAverageProofOfWorkNonceTrialsPerByte is %s' % requiredAverageProofOfWorkNonceTrialsPerByte) requiredPayloadLengthExtraBytes, varintLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += varintLength logger.info('sender\'s requiredPayloadLengthExtraBytes is %s' % requiredPayloadLengthExtraBytes) endOfThePublicKeyPosition = readPosition # needed for when we store the pubkey in our database of pubkeys for later use. if toRipe != decryptedData[readPosition:readPosition + 20]: logger.info('The original sender of this message did not send it to you. Someone is attempting a Surreptitious Forwarding Attack.\n\ See: http://world.std.com/~dtd/sign_encrypt/sign_encrypt7.html \n\ your toRipe: %s\n\ embedded destination toRipe: %s' % (toRipe.encode('hex'), 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] signedData = data[8:20] + encodeVarint(1) + encodeVarint(streamNumberAsClaimedByMsg) + decryptedData[:positionOfBottomOfAckData] if not highlevelcrypto.verify(signedData, signature, pubSigningKey.encode('hex')): logger.debug('ECDSA verify failed') return logger.debug('ECDSA verify passed') logger.debug('As a matter of intellectual curiosity, here is the Bitcoin address associated with the keys owned by the other person: %s ..and here is the testnet address: %s. 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.' % (helper_bitcoin.calculateBitcoinAddressFromPubkey(pubSigningKey), helper_bitcoin.calculateTestnetAddressFromPubkey(pubSigningKey)) ) sigHash = hashlib.sha512(hashlib.sha512(signature).digest()).digest()[32:] # Used to detect and ignore duplicate messages in our inbox # calculate the fromRipe. sha = hashlib.new('sha512') sha.update(pubSigningKey + pubEncryptionKey) ripe = hashlib.new('ripemd160') ripe.update(sha.digest()) fromAddress = encodeAddress( sendersAddressVersionNumber, sendersStreamNumber, ripe.digest()) # Let's store the public key in case we want to reply to this # person. sqlExecute( '''INSERT INTO pubkeys VALUES (?,?,?,?,?)''', fromAddress, sendersAddressVersionNumber, decryptedData[:endOfThePublicKeyPosition], int(time.time()), 'yes') # 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(fromAddress) # 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 this is bound for one of my chan # addresses then we skip this check; the minimum network POW is # fine. if decodeAddress(toAddress)[1] >= 3 and not shared.safeConfigGetBoolean(toAddress, 'chan'): # If the toAddress version number is 3 or higher and not one of my chan addresses: 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 shared.isProofOfWorkSufficient(data, requiredNonceTrialsPerByte, requiredPayloadLengthExtraBytes): logger.info('Proof of work in msg is 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 != []: logger.info('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' ''', fromAddress) if queryreturn == []: logger.info('Message ignored because address not in whitelist.') blockMessage = True toLabel = shared.config.get(toAddress, 'label') if toLabel == '': toLabel = toAddress if messageEncodingType == 2: subject, body = self.decodeType2Message(message) logger.info('Message subject (first 100 characters): %s' % repr(subject)[:100]) elif messageEncodingType == 1: body = message subject = '' elif messageEncodingType == 0: logger.info('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.') subject = '' body = '' else: body = 'Unknown encoding type.\n\n' + repr(message) subject = '' # Let us make sure that we haven't already received this message if helper_inbox.isMessageAlreadyInInbox(sigHash): logger.info('This msg is already in our inbox. Ignoring it.') blockMessage = True if not blockMessage: if messageEncodingType != 0: t = (inventoryHash, toAddress, fromAddress, subject, int( time.time()), body, 'inbox', messageEncodingType, 0, sigHash) helper_inbox.insert(t) shared.UISignalQueue.put(('displayNewInboxMessage', ( 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. ackdataForBroadcast = OpenSSL.rand( 32) # We don't actually need the ackdataForBroadcast 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 = '' # We really should have a discussion about how to # set the TTL for mailing list broadcasts. This is obviously # hard-coded. TTL = 2*7*24*60*60 # 2 weeks t = ('', toAddress, ripe, fromAddress, subject, message, ackdataForBroadcast, int(time.time()), # sentTime (this doesn't change) int(time.time()), # lastActionTime 0, 'broadcastqueued', 0, 'sent', 2, TTL) helper_sent.insert(t) shared.UISignalQueue.put(('displayNewSentMessage', ( toAddress, '[Broadcast subscribers]', fromAddress, subject, message, ackdataForBroadcast))) shared.workerQueue.put(('sendbroadcast', '')) if self.ackDataHasAVaildHeader(ackData): shared.checkAndShareObjectWithPeers(ackData[24:]) # Display timing data timeRequiredToAttemptToDecryptMessage = time.time( ) - messageProcessingStartTime shared.successfullyDecryptMessageTimings.append( timeRequiredToAttemptToDecryptMessage) sum = 0 for item in shared.successfullyDecryptMessageTimings: sum += item logger.debug('Time to decrypt this message successfully: %s\n\ Average time for all message decryption successes since startup: %s.' % (timeRequiredToAttemptToDecryptMessage, sum / len(shared.successfullyDecryptMessageTimings)) )
def processbroadcast(self, data): messageProcessingStartTime = time.time() shared.numberOfBroadcastsProcessed += 1 queues.UISignalQueue.put( ('updateNumberOfBroadcastsProcessed', 'no data')) inventoryHash = calculateInventoryHash(data) readPosition = 20 # bypass the nonce, time, and object type broadcastVersion, broadcastVersionLength = decodeVarint( data[readPosition:readPosition + 9]) readPosition += broadcastVersionLength if broadcastVersion < 4 or broadcastVersion > 5: logger.info( 'Cannot decode incoming broadcast versions less than 4' ' or higher than 5. Assuming the sender isn\'t being silly,' ' you should upgrade Bitmessage because this message shall' ' be ignored.') return cleartextStreamNumber, cleartextStreamNumberLength = decodeVarint( data[readPosition:readPosition + 10]) readPosition += cleartextStreamNumberLength if broadcastVersion == 4: # v4 broadcasts are encrypted the same way the msgs are # encrypted. To see if we are interested in a v4 broadcast, # we try to decrypt it. This was replaced with v5 broadcasts # which include a tag which we check instead, just like we do # with v4 pubkeys. signedData = data[8:readPosition] initialDecryptionSuccessful = False for key, cryptorObject in sorted( shared.MyECSubscriptionCryptorObjects.items(), key=lambda x: random.random()): try: # continue decryption attempts to avoid timing attacks if initialDecryptionSuccessful: cryptorObject.decrypt(data[readPosition:]) else: decryptedData = cryptorObject.decrypt( data[readPosition:]) # 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. toRipe = key initialDecryptionSuccessful = True logger.info( 'EC decryption successful using key associated' ' with ripe hash: %s', hexlify(key)) except Exception: logger.debug('cryptorObject.decrypt Exception:', exc_info=True) if not initialDecryptionSuccessful: # This is not a broadcast I am interested in. logger.debug( 'Length of time program spent failing to decrypt this' ' v4 broadcast: %s seconds.', time.time() - messageProcessingStartTime) return elif broadcastVersion == 5: embeddedTag = data[readPosition:readPosition + 32] readPosition += 32 if embeddedTag not in shared.MyECSubscriptionCryptorObjects: logger.debug('We\'re not interested in this broadcast.') return # We are interested in this broadcast because of its tag. # We're going to add some more data which is signed further down. signedData = data[8:readPosition] cryptorObject = shared.MyECSubscriptionCryptorObjects[embeddedTag] try: decryptedData = cryptorObject.decrypt(data[readPosition:]) logger.debug('EC decryption successful') except Exception: logger.debug('Broadcast version %s decryption Unsuccessful.', broadcastVersion) return # At this point this is a broadcast I have decrypted and am # interested in. readPosition = 0 sendersAddressVersion, sendersAddressVersionLength = decodeVarint( decryptedData[readPosition:readPosition + 9]) if broadcastVersion == 4: if sendersAddressVersion < 2 or sendersAddressVersion > 3: logger.warning( '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 elif broadcastVersion == 5: if sendersAddressVersion < 4: logger.info( 'Cannot decode senderAddressVersion less than 4 for' ' broadcast version number 5. 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: logger.info( '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 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 logger.debug( 'sender\'s requiredAverageProofOfWorkNonceTrialsPerByte' ' is %s', requiredAverageProofOfWorkNonceTrialsPerByte) requiredPayloadLengthExtraBytes, varintLength = decodeVarint( decryptedData[readPosition:readPosition + 10]) readPosition += varintLength logger.debug('sender\'s requiredPayloadLengthExtraBytes is %s', requiredPayloadLengthExtraBytes) endOfPubkeyPosition = readPosition sha = hashlib.new('sha512') sha.update(sendersPubSigningKey + sendersPubEncryptionKey) calculatedRipe = RIPEMD160Hash(sha.digest()).digest() if broadcastVersion == 4: if toRipe != calculatedRipe: logger.info('The encryption key used to encrypt this message' ' doesn\'t match the keys inbedded in the message' ' itself. Ignoring message.') return elif broadcastVersion == 5: calculatedTag = hashlib.sha512( hashlib.sha512( encodeVarint(sendersAddressVersion) + encodeVarint(sendersStream) + calculatedRipe).digest()).digest()[32:] if calculatedTag != embeddedTag: logger.debug('The tag and 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] signedData += decryptedData[:readPositionAtBottomOfMessage] if not highlevelcrypto.verify(signedData, signature, hexlify(sendersPubSigningKey)): logger.debug('ECDSA verify failed') return logger.debug('ECDSA verify passed') # Used to detect and ignore duplicate messages in our inbox sigHash = hashlib.sha512( hashlib.sha512(signature).digest()).digest()[32:] fromAddress = encodeAddress(sendersAddressVersion, sendersStream, calculatedRipe) logger.info('fromAddress: %s' % fromAddress) # Let's store the public key in case we want to reply to this person. sqlExecute('''INSERT INTO pubkeys VALUES (?,?,?,?,?)''', fromAddress, sendersAddressVersion, decryptedData[:endOfPubkeyPosition], int(time.time()), 'yes') # 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(fromAddress) fromAddress = encodeAddress(sendersAddressVersion, sendersStream, calculatedRipe) logger.debug('fromAddress: ' + fromAddress) try: decodedMessage = helper_msgcoding.MsgDecode( messageEncodingType, message) except helper_msgcoding.MsgDecodeException: return subject = decodedMessage.subject body = decodedMessage.body toAddress = '[Broadcast subscribers]' if helper_inbox.isMessageAlreadyInInbox(sigHash): logger.info('This broadcast is already in our inbox. Ignoring it.') return t = (inventoryHash, toAddress, fromAddress, subject, int(time.time()), body, 'inbox', messageEncodingType, 0, sigHash) helper_inbox.insert(t) queues.UISignalQueue.put( ('displayNewInboxMessage', (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 BMConfigParser().safeGetBoolean('bitmessagesettings', 'apienabled'): try: apiNotifyPath = BMConfigParser().get('bitmessagesettings', 'apinotifypath') except: apiNotifyPath = '' if apiNotifyPath != '': call([apiNotifyPath, "newBroadcast"]) # Display timing data logger.info('Time spent processing this interesting broadcast: %s', time.time() - messageProcessingStartTime)