PyBitmessage/src/class_objectProcessor.py

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import time
import threading
import shared
import hashlib
import random
from struct import unpack, pack
import sys
import string
from subprocess import call # used when the API must execute an outside program
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import traceback
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from pyelliptic.openssl import OpenSSL
import highlevelcrypto
from addresses import *
import helper_generic
from helper_generic import addDataPadding
import helper_bitcoin
import helper_inbox
import helper_sent
from helper_sql import *
import tr
from debug import logger
import l10n
class objectProcessor(threading.Thread):
"""
The objectProcessor thread, of which there is only one, receives network
objecs (msg, broadcast, pubkey, getpubkey) from the receiveDataThreads.
"""
def __init__(self):
threading.Thread.__init__(self)
"""
It may be the case that the last time Bitmessage was running, the user
closed it before it finished processing everything in the
objectProcessorQueue. Assuming that Bitmessage wasn't closed forcefully,
it should have saved the data in the queue into the objectprocessorqueue
table. Let's pull it out.
"""
queryreturn = sqlQuery(
'''SELECT objecttype, data FROM objectprocessorqueue''')
with shared.objectProcessorQueueSizeLock:
for row in queryreturn:
objectType, data = row
shared.objectProcessorQueueSize += len(data)
shared.objectProcessorQueue.put((objectType,data))
sqlExecute('''DELETE FROM objectprocessorqueue''')
logger.debug('Loaded %s objects from disk into the objectProcessorQueue.' % str(len(queryreturn)))
def run(self):
while True:
objectType, data = shared.objectProcessorQueue.get()
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try:
if objectType == 0: # getpubkey
self.processgetpubkey(data)
elif objectType == 1: #pubkey
self.processpubkey(data)
elif objectType == 2: #msg
self.processmsg(data)
elif objectType == 3: #broadcast
self.processbroadcast(data)
elif objectType == 'checkShutdownVariable': # is more of a command, not an object type. Is used to get this thread past the queue.get() so that it will check the shutdown variable.
pass
else:
logger.critical('Error! Bug! The class_objectProcessor was passed an object type it doesn\'t recognize: %s' % str(objectType))
except varintDecodeError as e:
logger.debug("There was a problem with a varint while processing an object. Some details: %s" % e)
except Exception as e:
logger.critical("Critical error within objectProcessorThread: \n%s" % traceback.format_exc())
with shared.objectProcessorQueueSizeLock:
shared.objectProcessorQueueSize -= len(data) # We maintain objectProcessorQueueSize so that we will slow down requesting objects if too much data accumulates in the queue.
if shared.shutdown:
time.sleep(.5) # Wait just a moment for most of the connections to close
numberOfObjectsThatWereInTheObjectProcessorQueue = 0
with SqlBulkExecute() as sql:
while shared.objectProcessorQueueSize > 1:
objectType, data = shared.objectProcessorQueue.get()
sql.execute('''INSERT INTO objectprocessorqueue VALUES (?,?)''',
objectType,data)
with shared.objectProcessorQueueSizeLock:
shared.objectProcessorQueueSize -= len(data) # We maintain objectProcessorQueueSize so that we will slow down requesting objects if too much data accumulates in the queue.
numberOfObjectsThatWereInTheObjectProcessorQueue += 1
logger.debug('Saved %s objects from the objectProcessorQueue to disk. objectProcessorThread exiting.' % str(numberOfObjectsThatWereInTheObjectProcessorQueue))
shared.shutdown = 2
break
def processgetpubkey(self, data):
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readPosition = 20 # bypass the nonce, time, and object type
requestedAddressVersionNumber, addressVersionLength = decodeVarint(
data[readPosition:readPosition + 10])
readPosition += addressVersionLength
streamNumber, streamNumberLength = decodeVarint(
data[readPosition:readPosition + 10])
readPosition += streamNumberLength
if requestedAddressVersionNumber == 0:
logger.debug('The requestedAddressVersionNumber of the pubkey request is zero. That doesn\'t make any sense. Ignoring it.')
return
elif requestedAddressVersionNumber == 1:
logger.debug('The requestedAddressVersionNumber of the pubkey request is 1 which isn\'t supported anymore. Ignoring it.')
return
elif requestedAddressVersionNumber > 4:
logger.debug('The requestedAddressVersionNumber of the pubkey request is too high. Can\'t understand. Ignoring it.')
return
myAddress = ''
if requestedAddressVersionNumber <= 3 :
requestedHash = data[readPosition:readPosition + 20]
if len(requestedHash) != 20:
logger.debug('The length of the requested hash is not 20 bytes. Something is wrong. Ignoring.')
return
logger.info('the hash requested in this getpubkey request is: %s' % requestedHash.encode('hex'))
if requestedHash in shared.myAddressesByHash: # if this address hash is one of mine
myAddress = shared.myAddressesByHash[requestedHash]
elif requestedAddressVersionNumber >= 4:
requestedTag = data[readPosition:readPosition + 32]
if len(requestedTag) != 32:
logger.debug('The length of the requested tag is not 32 bytes. Something is wrong. Ignoring.')
return
logger.debug('the tag requested in this getpubkey request is: %s' % requestedTag.encode('hex'))
if requestedTag in shared.myAddressesByTag:
myAddress = shared.myAddressesByTag[requestedTag]
if myAddress == '':
logger.info('This getpubkey request is not for any of my keys.')
return
if decodeAddress(myAddress)[1] != requestedAddressVersionNumber:
logger.warning('(Within the processgetpubkey function) Someone requested one of my pubkeys but the requestedAddressVersionNumber doesn\'t match my actual address version number. Ignoring.')
return
if decodeAddress(myAddress)[2] != streamNumber:
logger.warning('(Within the processgetpubkey function) Someone requested one of my pubkeys but the stream number on which we heard this getpubkey object doesn\'t match this address\' stream number. Ignoring.')
return
if shared.safeConfigGetBoolean(myAddress, 'chan'):
logger.info('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(
myAddress, 'lastpubkeysendtime'))
except:
lastPubkeySendTime = 0
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if lastPubkeySendTime > time.time() - 2419200: # If the last time we sent our pubkey was more recent than 28 days ago...
logger.info('Found getpubkey-requested-item in my list of EC hashes BUT we already sent it recently. Ignoring request. The lastPubkeySendTime is: %s' % lastPubkeySendTime)
return
logger.info('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))
elif requestedAddressVersionNumber == 4:
shared.workerQueue.put((
'sendOutOrStoreMyV4Pubkey', myAddress))
def processpubkey(self, data):
pubkeyProcessingStartTime = time.time()
shared.numberOfPubkeysProcessed += 1
shared.UISignalQueue.put((
'updateNumberOfPubkeysProcessed', 'no data'))
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embeddedTime, = unpack('>Q', data[8:16])
readPosition = 20 # bypass the nonce, time, and object type
addressVersion, varintLength = decodeVarint(
data[readPosition:readPosition + 10])
readPosition += varintLength
streamNumber, varintLength = decodeVarint(
data[readPosition:readPosition + 10])
readPosition += varintLength
if addressVersion == 0:
logger.debug('(Within processpubkey) addressVersion of 0 doesn\'t make sense.')
return
if addressVersion > 4 or addressVersion == 1:
logger.info('This version of Bitmessage cannot handle version %s addresses.' % addressVersion)
return
if addressVersion == 2:
if len(data) < 146: # sanity check. This is the minimum possible length.
logger.debug('(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
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# encrypt or sign with it will cause an error? If it is, it would
# be easiest to test them here.
readPosition += 64
publicEncryptionKey = data[readPosition:readPosition + 64]
if len(publicEncryptionKey) < 64:
logger.debug('publicEncryptionKey length less than 64. Sanity check failed.')
return
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readPosition += 64
dataToStore = data[20:readPosition] # The data we'll store in the pubkeys table.
sha = hashlib.new('sha512')
sha.update(
'\x04' + publicSigningKey + '\x04' + publicEncryptionKey)
ripeHasher = hashlib.new('ripemd160')
ripeHasher.update(sha.digest())
ripe = ripeHasher.digest()
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logger.debug('within recpubkey, addressVersion: %s, streamNumber: %s \n\
ripe %s\n\
publicSigningKey in hex: %s\n\
publicEncryptionKey in hex: %s' % (addressVersion,
streamNumber,
ripe.encode('hex'),
publicSigningKey.encode('hex'),
publicEncryptionKey.encode('hex')
)
)
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address = encodeAddress(addressVersion, streamNumber, ripe)
queryreturn = sqlQuery(
'''SELECT usedpersonally FROM pubkeys WHERE address=? AND usedpersonally='yes' ''', address)
if queryreturn != []: # if this pubkey is already in our database and if we have used it personally:
logger.info('We HAVE used this pubkey personally. Updating time.')
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t = (address, addressVersion, dataToStore, int(time.time()), 'yes')
else:
logger.info('We have NOT used this pubkey personally. Inserting in database.')
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t = (address, addressVersion, dataToStore, int(time.time()), 'no')
sqlExecute('''INSERT INTO pubkeys VALUES (?,?,?,?,?)''', *t)
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self.possibleNewPubkey(address)
if addressVersion == 3:
if len(data) < 170: # sanity check.
logger.warning('(within processpubkey) payloadLength less than 170. Sanity check failed.')
return
bitfieldBehaviors = data[readPosition:readPosition + 4]
readPosition += 4
publicSigningKey = '\x04' + data[readPosition:readPosition + 64]
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
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dataToStore = data[20:readPosition] # The data we'll store in the pubkeys table.
signatureLength, signatureLengthLength = decodeVarint(
data[readPosition:readPosition + 10])
readPosition += signatureLengthLength
signature = data[readPosition:readPosition + signatureLength]
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if highlevelcrypto.verify(data[8:endOfSignedDataPosition], signature, publicSigningKey.encode('hex')):
logger.debug('ECDSA verify passed (within processpubkey)')
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else:
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logger.warning('ECDSA verify failed (within processpubkey)')
return
sha = hashlib.new('sha512')
sha.update(publicSigningKey + publicEncryptionKey)
ripeHasher = hashlib.new('ripemd160')
ripeHasher.update(sha.digest())
ripe = ripeHasher.digest()
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logger.debug('within recpubkey, addressVersion: %s, streamNumber: %s \n\
ripe %s\n\
publicSigningKey in hex: %s\n\
publicEncryptionKey in hex: %s' % (addressVersion,
streamNumber,
ripe.encode('hex'),
publicSigningKey.encode('hex'),
publicEncryptionKey.encode('hex')
)
)
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address = encodeAddress(addressVersion, streamNumber, ripe)
queryreturn = sqlQuery('''SELECT usedpersonally FROM pubkeys WHERE address=? AND usedpersonally='yes' ''', address)
if queryreturn != []: # if this pubkey is already in our database and if we have used it personally:
logger.info('We HAVE used this pubkey personally. Updating time.')
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t = (address, addressVersion, dataToStore, int(time.time()), 'yes')
else:
logger.info('We have NOT used this pubkey personally. Inserting in database.')
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t = (address, addressVersion, dataToStore, int(time.time()), 'no')
sqlExecute('''INSERT INTO pubkeys VALUES (?,?,?,?,?)''', *t)
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self.possibleNewPubkey(address)
if addressVersion == 4:
if len(data) < 350: # sanity check.
logger.debug('(within processpubkey) payloadLength less than 350. Sanity check failed.')
return
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tag = data[readPosition:readPosition + 32]
if tag not in shared.neededPubkeys:
logger.info('We don\'t need this v4 pubkey. We didn\'t ask for it.')
return
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# Let us try to decrypt the pubkey
toAddress, cryptorObject = shared.neededPubkeys[tag]
if shared.decryptAndCheckPubkeyPayload(data, toAddress) == 'successful':
# At this point we know that we have been waiting on this pubkey.
# This function will command the workerThread to start work on
# the messages that require it.
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self.possibleNewPubkey(toAddress)
# Display timing data
timeRequiredToProcessPubkey = time.time(
) - pubkeyProcessingStartTime
logger.debug('Time required to process this pubkey: %s' % timeRequiredToProcessPubkey)
def processmsg(self, data):
messageProcessingStartTime = time.time()
shared.numberOfMessagesProcessed += 1
shared.UISignalQueue.put((
'updateNumberOfMessagesProcessed', 'no data'))
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readPosition = 20 # bypass the nonce, time, and object type
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msgVersion, msgVersionLength = decodeVarint(data[readPosition:readPosition + 9])
if msgVersion != 1:
logger.info('Cannot understand message versions other than one. Ignoring message.')
return
readPosition += msgVersionLength
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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.
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if data[-32:] in shared.ackdataForWhichImWatching:
logger.info('This msg IS an acknowledgement bound for me.')
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del shared.ackdataForWhichImWatching[data[-32:]]
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sqlExecute('UPDATE sent SET status=?, lastactiontime=? WHERE ackdata=?',
'ackreceived',
int(time.time()),
data[-32:])
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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.
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for key, cryptorObject in shared.myECCryptorObjects.items():
try:
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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
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logger.info('EC decryption successful using key associated with ripe hash: %s.' % key.encode('hex'))
break
except Exception as err:
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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]
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signedData = data[8:20] + encodeVarint(1) + encodeVarint(streamNumberAsClaimedByMsg) + decryptedData[:positionOfBottomOfAckData]
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if not highlevelcrypto.verify(signedData, signature, pubSigningKey.encode('hex')):
logger.debug('ECDSA verify failed')
return
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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())
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# Let's store the public key in case we want to reply to this
# person.
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sqlExecute(
'''INSERT INTO pubkeys VALUES (?,?,?,?,?)''',
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fromAddress,
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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.
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self.possibleNewPubkey(fromAddress)
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# 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):
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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
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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):
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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 = ''
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# 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):
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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)
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readPosition = 20 # bypass the nonce, time, and object type
broadcastVersion, broadcastVersionLength = decodeVarint(
data[readPosition:readPosition + 9])
readPosition += broadcastVersionLength
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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
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cleartextStreamNumber, cleartextStreamNumberLength = decodeVarint(
data[readPosition:readPosition + 10])
readPosition += cleartextStreamNumberLength
if broadcastVersion == 4:
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"""
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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
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we check instead, just like we do with v4 pubkeys.
"""
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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.
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logger.debug('Length of time program spent failing to decrypt this v4 broadcast: %s seconds.' % (time.time() - messageProcessingStartTime,))
return
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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.
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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:
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logger.debug('Broadcast version %s decryption Unsuccessful.' % broadcastVersion)
return
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# 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
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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
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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
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sha = hashlib.new('sha512')
sha.update(sendersPubSigningKey + sendersPubEncryptionKey)
ripeHasher = hashlib.new('ripemd160')
ripeHasher.update(sha.digest())
calculatedRipe = ripeHasher.digest()
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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
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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
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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 (?,?,?,?,?)''',
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fromAddress,
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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.
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self.possibleNewPubkey(fromAddress)
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fromAddress = encodeAddress(
sendersAddressVersion, sendersStream, calculatedRipe)
with shared.printLock:
print 'fromAddress:', fromAddress
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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
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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)