PyBitmessage/src/class_objectProcessor.py
2013-11-13 22:45:10 -05:00

433 lines
23 KiB
Python

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
from pyelliptic.openssl import OpenSSL
import highlevelcrypto
from addresses import *
import helper_generic
import helper_bitcoin
import helper_inbox
import helper_sent
from helper_sql import *
import tr
from debug import logger
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)
def run(self):
while True:
data = shared.objectProcessorQueue.get()
remoteCommand = data[4:16]
if remoteCommand == 'msg\x00\x00\x00\x00\x00\x00\x00\x00\x00':
self.processmsg(data)
def processmsg(self, data):
"""
We know that the POW and time are correct as they were checked by the
receiveDataThread.
"""
readPosition = 8
embeddedTime, = unpack('>I', data[readPosition:readPosition + 4])
# This section is used for the transition from 32 bit time to 64 bit
# time in the protocol.
if embeddedTime == 0:
embeddedTime, = unpack('>Q', data[readPosition:readPosition + 8])
readPosition += 8
else:
readPosition += 4
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[readPosition:] in shared.ackdataForWhichImWatching:
with shared.printLock:
print 'This msg IS an acknowledgement bound for me.'
del shared.ackdataForWhichImWatching[data[readPosition:]]
sqlExecute('UPDATE sent SET status=? WHERE ackdata=?',
'ackreceived', data[readPosition:])
shared.UISignalQueue.put(('updateSentItemStatusByAckdata', (data[readPosition:], tr.translateText("MainWindow",'Acknowledgement of the message received. %1').arg(unicode(
time.strftime(shared.config.get('bitmessagesettings', 'timeformat'), time.localtime(int(time.time()))), 'utf-8')))))
return
else:
with shared.printLock:
print 'This was NOT an acknowledgement bound for me.'
# print 'shared.ackdataForWhichImWatching', shared.ackdataForWhichImWatching
# This is not an acknowledgement bound for me. See if it is a message
# bound for me by trying to decrypt it with my private keys.
for key, cryptorObject in shared.myECCryptorObjects.items():
try:
decryptedData = cryptorObject.decrypt(
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
with shared.printLock:
print 'EC decryption successful using key associated with ripe hash:', key.encode('hex')
break
except Exception as err:
pass
# print 'cryptorObject.decrypt Exception:', err
if not initialDecryptionSuccessful:
# This is not a message bound for me.
with shared.printLock:
print 'Length of time program spent failing to decrypt this message:', time.time() - self.messageProcessingStartTime, 'seconds.'
else:
# This is a message bound for me.
toAddress = shared.myAddressesByHash[
toRipe] # Look up my address based on the RIPE hash.
readPosition = 0
messageVersion, messageVersionLength = decodeVarint(
decryptedData[readPosition:readPosition + 10])
readPosition += messageVersionLength
if messageVersion != 1:
print 'Cannot understand message versions other than one. Ignoring message.'
return
sendersAddressVersionNumber, sendersAddressVersionNumberLength = decodeVarint(
decryptedData[readPosition:readPosition + 10])
readPosition += sendersAddressVersionNumberLength
if sendersAddressVersionNumber == 0:
print 'Cannot understand sendersAddressVersionNumber = 0. Ignoring message.'
return
if sendersAddressVersionNumber > 4:
print 'Sender\'s address version number', sendersAddressVersionNumber, 'not yet supported. Ignoring message.'
return
if len(decryptedData) < 170:
print 'Length of the unencrypted data is unreasonably short. Sanity check failed. Ignoring message.'
return
sendersStreamNumber, sendersStreamNumberLength = decodeVarint(
decryptedData[readPosition:readPosition + 10])
if sendersStreamNumber == 0:
print 'sender\'s stream number is 0. Ignoring message.'
return
readPosition += sendersStreamNumberLength
behaviorBitfield = decryptedData[readPosition:readPosition + 4]
readPosition += 4
pubSigningKey = '\x04' + decryptedData[
readPosition:readPosition + 64]
readPosition += 64
pubEncryptionKey = '\x04' + decryptedData[
readPosition:readPosition + 64]
readPosition += 64
if sendersAddressVersionNumber >= 3:
requiredAverageProofOfWorkNonceTrialsPerByte, varintLength = decodeVarint(
decryptedData[readPosition:readPosition + 10])
readPosition += varintLength
print 'sender\'s requiredAverageProofOfWorkNonceTrialsPerByte is', requiredAverageProofOfWorkNonceTrialsPerByte
requiredPayloadLengthExtraBytes, varintLength = decodeVarint(
decryptedData[readPosition:readPosition + 10])
readPosition += varintLength
print 'sender\'s requiredPayloadLengthExtraBytes is', requiredPayloadLengthExtraBytes
endOfThePublicKeyPosition = readPosition # needed for when we store the pubkey in our database of pubkeys for later use.
if toRipe != decryptedData[readPosition:readPosition + 20]:
with shared.printLock:
print 'The original sender of this message did not send it to you. Someone is attempting a Surreptitious Forwarding Attack.'
print 'See: http://world.std.com/~dtd/sign_encrypt/sign_encrypt7.html'
print 'your toRipe:', toRipe.encode('hex')
print 'embedded destination toRipe:', decryptedData[readPosition:readPosition + 20].encode('hex')
return
readPosition += 20
messageEncodingType, messageEncodingTypeLength = decodeVarint(
decryptedData[readPosition:readPosition + 10])
readPosition += messageEncodingTypeLength
messageLength, messageLengthLength = decodeVarint(
decryptedData[readPosition:readPosition + 10])
readPosition += messageLengthLength
message = decryptedData[readPosition:readPosition + messageLength]
# print 'First 150 characters of message:', repr(message[:150])
readPosition += messageLength
ackLength, ackLengthLength = decodeVarint(
decryptedData[readPosition:readPosition + 10])
readPosition += ackLengthLength
ackData = decryptedData[readPosition:readPosition + ackLength]
readPosition += ackLength
positionOfBottomOfAckData = readPosition # needed to mark the end of what is covered by the signature
signatureLength, signatureLengthLength = decodeVarint(
decryptedData[readPosition:readPosition + 10])
readPosition += signatureLengthLength
signature = decryptedData[
readPosition:readPosition + signatureLength]
try:
if not highlevelcrypto.verify(decryptedData[:positionOfBottomOfAckData], signature, pubSigningKey.encode('hex')):
print 'ECDSA verify failed'
return
print 'ECDSA verify passed'
except Exception as err:
print 'ECDSA verify failed', err
return
with shared.printLock:
print 'As a matter of intellectual curiosity, here is the Bitcoin address associated with the keys owned by the other person:', helper_bitcoin.calculateBitcoinAddressFromPubkey(pubSigningKey), ' ..and here is the testnet address:', helper_bitcoin.calculateTestnetAddressFromPubkey(pubSigningKey), '. The other person must take their private signing key from Bitmessage and import it into Bitcoin (or a service like Blockchain.info) for it to be of any use. Do not use this unless you know what you are doing.'
# calculate the fromRipe.
sha = hashlib.new('sha512')
sha.update(pubSigningKey + pubEncryptionKey)
ripe = hashlib.new('ripemd160')
ripe.update(sha.digest())
fromAddress = encodeAddress(
sendersAddressVersionNumber, sendersStreamNumber, ripe.digest())
# Let's store the public key in case we want to reply to this
# person.
if sendersAddressVersionNumber <= 3:
sqlExecute(
'''INSERT INTO pubkeys VALUES (?,?,?,?,?)''',
ripe.digest(),
sendersAddressVersionNumber,
'\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF' + '\xFF\xFF\xFF\xFF' + decryptedData[messageVersionLength:endOfThePublicKeyPosition],
int(time.time()),
'yes')
# This will check to see whether we happen to be awaiting this
# pubkey in order to send a message. If we are, it will do the POW
# and send it.
self.possibleNewPubkey(ripe=ripe.digest())
elif sendersAddressVersionNumber >= 4:
sqlExecute(
'''INSERT INTO pubkeys VALUES (?,?,?,?,?)''',
ripe.digest(),
sendersAddressVersionNumber,
'\x00\x00\x00\x00\x00\x00\x00\x01' + decryptedData[messageVersionLength:endOfThePublicKeyPosition],
int(time.time()),
'yes')
# This will check to see whether we happen to be awaiting this
# pubkey in order to send a message. If we are, it will do the POW
# and send it.
self.possibleNewPubkey(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 decodeAddress(toAddress)[1] >= 3: # If the toAddress version number is 3 or higher:
if not shared.isAddressInMyAddressBookSubscriptionsListOrWhitelist(fromAddress): # If I'm not friendly with this person:
requiredNonceTrialsPerByte = shared.config.getint(
toAddress, 'noncetrialsperbyte')
requiredPayloadLengthExtraBytes = shared.config.getint(
toAddress, 'payloadlengthextrabytes')
if not self.isProofOfWorkSufficient(data, requiredNonceTrialsPerByte, requiredPayloadLengthExtraBytes):
print 'Proof of work in msg message insufficient only because it does not meet our higher requirement.'
return
blockMessage = False # Gets set to True if the user shouldn't see the message according to black or white lists.
if shared.config.get('bitmessagesettings', 'blackwhitelist') == 'black': # If we are using a blacklist
queryreturn = sqlQuery(
'''SELECT label FROM blacklist where address=? and enabled='1' ''',
fromAddress)
if queryreturn != []:
with shared.printLock:
print 'Message ignored because address is in blacklist.'
blockMessage = True
else: # We're using a whitelist
queryreturn = sqlQuery(
'''SELECT label FROM whitelist where address=? and enabled='1' ''',
fromAddress)
if queryreturn == []:
print 'Message ignored because address not in whitelist.'
blockMessage = True
if not blockMessage:
toLabel = shared.config.get(toAddress, 'label')
if toLabel == '':
toLabel = toAddress
if messageEncodingType == 2:
subject, body = self.decodeType2Message(message)
elif messageEncodingType == 1:
body = message
subject = ''
elif messageEncodingType == 0:
print 'messageEncodingType == 0. Doing nothing with the message. They probably just sent it so that we would store their public key or send their ack data for them.'
else:
body = 'Unknown encoding type.\n\n' + repr(message)
subject = ''
if messageEncodingType != 0:
t = (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.
ackdata = OpenSSL.rand(
32) # We don't actually need the ackdata for acknowledgement since this is a broadcast message but we can use it to update the user interface when the POW is done generating.
toAddress = '[Broadcast subscribers]'
ripe = ''
t = ('', toAddress, ripe, fromAddress, subject, message, ackdata, int(
time.time()), 'broadcastqueued', 1, 1, 'sent', 2)
helper_sent.insert(t)
shared.UISignalQueue.put(('displayNewSentMessage', (
toAddress, '[Broadcast subscribers]', fromAddress, subject, message, ackdata)))
shared.workerQueue.put(('sendbroadcast', ''))
if self.isAckDataValid(ackData):
print 'ackData is valid. Will process it.'
#self.ackDataThatWeHaveYetToSend.append(
# ackData) # When we have processed all data, the processData function will pop the ackData out and process it as if it is a message received from our peer.
shared.objectProcessorQueue.put(ackData)
# Display timing data
timeRequiredToAttemptToDecryptMessage = time.time(
) - self.messageProcessingStartTime
shared.successfullyDecryptMessageTimings.append(
timeRequiredToAttemptToDecryptMessage)
sum = 0
for item in shared.successfullyDecryptMessageTimings:
sum += item
with shared.printLock:
print 'Time to decrypt this message successfully:', timeRequiredToAttemptToDecryptMessage
print 'Average time for all message decryption successes since startup:', sum / len(shared.successfullyDecryptMessageTimings)
# We have inserted a pubkey into our pubkey table which we received from a
# pubkey, msg, or broadcast message. It might be one that we have been
# waiting for. Let's check.
def possibleNewPubkey(self, ripe=None, address=None):
# For address versions <= 3, we wait on a key with the correct ripe hash
if ripe != None:
if ripe in shared.neededPubkeys:
print 'We have been awaiting the arrival of this pubkey.'
del shared.neededPubkeys[ripe]
sqlExecute(
'''UPDATE sent SET status='doingmsgpow' WHERE toripe=? AND (status='awaitingpubkey' or status='doingpubkeypow') and folder='sent' ''',
ripe)
shared.workerQueue.put(('sendmessage', ''))
else:
with shared.printLock:
print 'We don\'t need this pub key. We didn\'t ask for it. Pubkey hash:', ripe.encode('hex')
# For address versions >= 4, we wait on a pubkey with the correct tag.
# Let us create the tag from the address and see if we were waiting
# for it.
elif address != None:
status, addressVersion, streamNumber, ripe = decodeAddress(address)
tag = hashlib.sha512(hashlib.sha512(encodeVarint(
addressVersion) + encodeVarint(streamNumber) + ripe).digest()).digest()[32:]
if tag in shared.neededPubkeys:
print 'We have been awaiting the arrival of this pubkey.'
del shared.neededPubkeys[tag]
sqlExecute(
'''UPDATE sent SET status='doingmsgpow' WHERE toripe=? AND (status='awaitingpubkey' or status='doingpubkeypow') and folder='sent' ''',
ripe)
shared.workerQueue.put(('sendmessage', ''))
def isAckDataValid(self, ackData):
if len(ackData) < 24:
print 'The length of ackData is unreasonably short. Not sending ackData.'
return False
if ackData[0:4] != '\xe9\xbe\xb4\xd9':
print 'Ackdata magic bytes were wrong. Not sending ackData.'
return False
ackDataPayloadLength, = unpack('>L', ackData[16:20])
if len(ackData) - 24 != ackDataPayloadLength:
print 'ackData payload length doesn\'t match the payload length specified in the header. Not sending ackdata.'
return False
if ackData[4:16] != 'getpubkey\x00\x00\x00' and ackData[4:16] != 'pubkey\x00\x00\x00\x00\x00\x00' and ackData[4:16] != 'msg\x00\x00\x00\x00\x00\x00\x00\x00\x00' and ackData[4:16] != 'broadcast\x00\x00\x00':
return False
readPosition = 24 # bypass the network header
if not shared.isProofOfWorkSufficient(ackData[readPosition:readPosition+10]):
print 'Proof of work in msg message insufficient.'
return
readPosition += 8 # bypass the POW nonce
embeddedTime, = unpack('>I', data[readPosition:readPosition + 4])
# This section is used for the transition from 32 bit time to 64 bit
# time in the protocol.
if embeddedTime == 0:
embeddedTime, = unpack('>Q', data[readPosition:readPosition + 8])
readPosition += 8
else:
readPosition += 4
if embeddedTime > int(time.time()) + 10800:
print 'The time in the msg message is too new. Ignoring it. Time:', embeddedTime
return
if embeddedTime < int(time.time()) - shared.maximumAgeOfAnObjectThatIAmWillingToAccept:
print 'The time in the msg message is too old. Ignoring it. Time:', embeddedTime
return
streamNumberAsClaimedByMsg, streamNumberAsClaimedByMsgLength = decodeVarint(
data[readPosition:readPosition + 9])
if not streamNumberAsClaimedByMsg in shared.streamsInWhichIAmParticipating:
print 'The stream number encoded in this msg (' + str(streamNumberAsClaimedByMsg) + ') message does not match a stream number on which it was received. Ignoring it.'
return
readPosition += streamNumberAsClaimedByMsgLength
self.inventoryHash = calculateInventoryHash(data)
shared.numberOfInventoryLookupsPerformed += 1
shared.inventoryLock.acquire()
if self.inventoryHash in shared.inventory:
print 'We have already received this msg message. Ignoring.'
shared.inventoryLock.release()
return
elif shared.isInSqlInventory(self.inventoryHash):
print 'We have already received this msg message (it is stored on disk in the SQL inventory). Ignoring it.'
shared.inventoryLock.release()
return
##################
return True
def decodeType2Message(self, message):
bodyPositionIndex = string.find(message, '\nBody:')
if bodyPositionIndex > 1:
subject = message[8:bodyPositionIndex]
# Only save and show the first 500 characters of the subject.
# Any more is probably an attack.
subject = subject[:500]
body = message[bodyPositionIndex + 6:]
else:
subject = ''
body = message
# Throw away any extra lines (headers) after the subject.
if subject:
subject = subject.splitlines()[0]
return subject, body
def addMailingListNameToSubject(self, subject, mailingListName):
subject = subject.strip()
if subject[:3] == 'Re:' or subject[:3] == 'RE:':
subject = subject[3:].strip()
if '[' + mailingListName + ']' in subject:
return subject
else:
return '[' + mailingListName + '] ' + subject