Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:
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"""
src/class_singleWorker.py
=========================
"""
# pylint: disable=protected-access,too-many-branches,too-many-statements,no-self-use,too-many-lines,too-many-locals
8 years ago
from __future__ import division
import hashlib
import threading
import time
from binascii import hexlify, unhexlify
from struct import pack
from subprocess import call # nosec
import defaults
import helper_inbox
import helper_msgcoding
import helper_random
import highlevelcrypto
import l10n
import proofofwork
import protocol
import queues
import shared
import state
import tr
from addresses import calculateInventoryHash, decodeAddress, decodeVarint, encodeVarint
from bmconfigparser import BMConfigParser
from debug import logger
from helper_sql import sqlExecute, sqlQuery
from helper_threading import StoppableThread
from inventory import Inventory
def sizeof_fmt(num, suffix='h/s'):
"""Format hashes per seconds nicely (SI prefix)"""
for unit in ['', 'k', 'M', 'G', 'T', 'P', 'E', 'Z']:
if abs(num) < 1000.0:
return "%3.1f%s%s" % (num, unit, suffix)
num /= 1024.0
return "%.1f%s%s" % (num, 'Yi', suffix)
class singleWorker(threading.Thread, StoppableThread):
"""Thread for performing PoW"""
def __init__(self):
threading.Thread.__init__(self, name="singleWorker")
self.initStop()
proofofwork.init()
def stopThread(self):
"""Signal through the queue that the thread should be stopped"""
try:
queues.workerQueue.put(("stopThread", "data"))
except:
pass
super(singleWorker, self).stopThread()
def run(self):
# pylint: disable=attribute-defined-outside-init
while not state.sqlReady and state.shutdown == 0:
self.stop.wait(2)
if state.shutdown > 0:
return
# Initialize the neededPubkeys dictionary.
queryreturn = sqlQuery(
'''SELECT DISTINCT toaddress FROM sent'''
''' WHERE (status='awaitingpubkey' AND folder='sent')''')
for row in queryreturn:
toAddress, = row
# toStatus
_, toAddressVersionNumber, toStreamNumber, toRipe = \
decodeAddress(toAddress)
if toAddressVersionNumber <= 3:
state.neededPubkeys[toAddress] = 0
elif toAddressVersionNumber >= 4:
doubleHashOfAddressData = hashlib.sha512(hashlib.sha512(
encodeVarint(toAddressVersionNumber) +
encodeVarint(toStreamNumber) + toRipe
).digest()).digest()
# Note that this is the first half of the sha512 hash.
privEncryptionKey = doubleHashOfAddressData[:32]
tag = doubleHashOfAddressData[32:]
# We'll need this for when we receive a pubkey reply:
# it will be encrypted and we'll need to decrypt it.
state.neededPubkeys[tag] = (
toAddress,
highlevelcrypto.makeCryptor(
hexlify(privEncryptionKey))
)
# Initialize the shared.ackdataForWhichImWatching data structure
queryreturn = sqlQuery(
'''SELECT ackdata FROM sent WHERE status = 'msgsent' ''')
for row in queryreturn:
ackdata, = row
logger.info('Watching for ackdata %s', hexlify(ackdata))
shared.ackdataForWhichImWatching[ackdata] = 0
# Fix legacy (headerless) watched ackdata to include header
for oldack in shared.ackdataForWhichImWatching:
if len(oldack) == 32:
# attach legacy header, always constant (msg/1/1)
newack = '\x00\x00\x00\x02\x01\x01' + oldack
shared.ackdataForWhichImWatching[newack] = 0
sqlExecute(
'UPDATE sent SET ackdata=? WHERE ackdata=?',
newack, oldack
)
del shared.ackdataForWhichImWatching[oldack]
# give some time for the GUI to start
# before we start on existing POW tasks.
self.stop.wait(10)
if state.shutdown:
return
# just in case there are any pending tasks for msg
# messages that have yet to be sent.
queues.workerQueue.put(('sendmessage', ''))
# just in case there are any tasks for Broadcasts
# that have yet to be sent.
queues.workerQueue.put(('sendbroadcast', ''))
# send onionpeer object
for peer in state.ownAddresses:
if peer.host.endswith('.onion'):
queues.workerQueue.put(('sendOnionPeerObj', peer))
break
while state.shutdown == 0:
self.busy = 0
command, data = queues.workerQueue.get()
self.busy = 1
if command == 'sendmessage':
try:
self.sendMsg()
except:
pass
elif command == 'sendbroadcast':
try:
self.sendBroadcast()
except:
pass
elif command == 'doPOWForMyV2Pubkey':
try:
self.doPOWForMyV2Pubkey(data)
except:
pass
elif command == 'sendOutOrStoreMyV3Pubkey':
try:
self.sendOutOrStoreMyV3Pubkey(data)
except:
pass
elif command == 'sendOutOrStoreMyV4Pubkey':
try:
self.sendOutOrStoreMyV4Pubkey(data)
except:
pass
elif command == 'sendOnionPeerObj':
try:
self.sendOnionPeerObj(data)
except:
pass
elif command == 'resetPoW':
try:
proofofwork.resetPoW()
except:
pass
elif command == 'stopThread':
self.busy = 0
return
else:
logger.error(
'Probable programming error: The command sent'
' to the workerThread is weird. It is: %s\n',
command
)
queues.workerQueue.task_done()
logger.info("Quitting...")
def _getKeysForAddress(self, address):
privSigningKeyBase58 = BMConfigParser().get(
address, 'privsigningkey')
privEncryptionKeyBase58 = BMConfigParser().get(
address, 'privencryptionkey')
privSigningKeyHex = hexlify(shared.decodeWalletImportFormat(
privSigningKeyBase58))
privEncryptionKeyHex = hexlify(shared.decodeWalletImportFormat(
privEncryptionKeyBase58))
# The \x04 on the beginning of the public keys are not sent.
# This way there is only one acceptable way to encode
# and send a public key.
pubSigningKey = unhexlify(highlevelcrypto.privToPub(
privSigningKeyHex))[1:]
pubEncryptionKey = unhexlify(highlevelcrypto.privToPub(
privEncryptionKeyHex))[1:]
return privSigningKeyHex, privEncryptionKeyHex, \
pubSigningKey, pubEncryptionKey
def _doPOWDefaults(self, payload, TTL,
log_prefix='',
log_time=False):
target = 2 ** 64 / (
defaults.networkDefaultProofOfWorkNonceTrialsPerByte * (
len(payload) + 8 +
defaults.networkDefaultPayloadLengthExtraBytes + ((
TTL * (
len(payload) + 8 +
defaults.networkDefaultPayloadLengthExtraBytes
)) / (2 ** 16))
))
initialHash = hashlib.sha512(payload).digest()
logger.info(
'%s Doing proof of work... TTL set to %s', log_prefix, TTL)
if log_time:
start_time = time.time()
trialValue, nonce = proofofwork.run(target, initialHash)
logger.info(
'%s Found proof of work %s Nonce: %s',
log_prefix, trialValue, nonce
)
try:
delta = time.time() - start_time
logger.info(
'PoW took %.1f seconds, speed %s.',
delta, sizeof_fmt(nonce / delta)
)
except: # NameError
pass
payload = pack('>Q', nonce) + payload
# inventoryHash = calculateInventoryHash(payload)
return payload
def doPOWForMyV2Pubkey(self, adressHash):
""" This function also broadcasts out the pubkey message once it is done with the POW"""
# Look up my stream number based on my address hash
myAddress = shared.myAddressesByHash[adressHash]
# status
_, addressVersionNumber, streamNumber, adressHash = decodeAddress(myAddress)
# 28 days from now plus or minus five minutes
TTL = int(28 * 24 * 60 * 60 + helper_random.randomrandrange(-300, 300))
embeddedTime = int(time.time() + TTL)
payload = pack('>Q', (embeddedTime))
payload += '\x00\x00\x00\x01' # object type: pubkey
payload += encodeVarint(addressVersionNumber) # Address version number
payload += encodeVarint(streamNumber)
# bitfield of features supported by me (see the wiki).
payload += protocol.getBitfield(myAddress)
try:
# privSigningKeyHex, privEncryptionKeyHex
_, _, pubSigningKey, pubEncryptionKey = \
self._getKeysForAddress(myAddress)
except Exception as err:
logger.error(
'Error within doPOWForMyV2Pubkey. Could not read'
' the keys from the keys.dat file for a requested'
' address. %s\n', err
)
return
payload += pubSigningKey + pubEncryptionKey
# Do the POW for this pubkey message
payload = self._doPOWDefaults(
payload, TTL, log_prefix='(For pubkey message)')
inventoryHash = calculateInventoryHash(payload)
objectType = 1
Inventory()[inventoryHash] = (
objectType, streamNumber, payload, embeddedTime, '')
logger.info('broadcasting inv with hash: %s', hexlify(inventoryHash))
queues.invQueue.put((streamNumber, inventoryHash))
queues.UISignalQueue.put(('updateStatusBar', ''))
9 years ago
try:
BMConfigParser().set(
9 years ago
myAddress, 'lastpubkeysendtime', str(int(time.time())))
BMConfigParser().save()
9 years ago
except:
# The user deleted the address out of the keys.dat file
# before this finished.
9 years ago
pass
def sendOutOrStoreMyV3Pubkey(self, adressHash):
"""
If this isn't a chan address, this function assembles the pubkey data, does the necessary POW and sends it out.
If it *is* a chan then it assembles the pubkey and stores is in the pubkey table so that we can send messages
to "ourselves".
"""
9 years ago
try:
myAddress = shared.myAddressesByHash[adressHash]
9 years ago
except:
# The address has been deleted.
9 years ago
return
if BMConfigParser().safeGetBoolean(myAddress, 'chan'):
logger.info('This is a chan address. Not sending pubkey.')
return
_, addressVersionNumber, streamNumber, adressHash = decodeAddress(
myAddress)
# 28 days from now plus or minus five minutes
TTL = int(28 * 24 * 60 * 60 + helper_random.randomrandrange(-300, 300))
embeddedTime = int(time.time() + TTL)
# signedTimeForProtocolV2 = embeddedTime - TTL
# According to the protocol specification, the expiresTime
# along with the pubkey information is signed. But to be
# backwards compatible during the upgrade period, we shall sign
# not the expiresTime but rather the current time. There must be
# precisely a 28 day difference between the two. After the upgrade
# period we'll switch to signing the whole payload with the
# expiresTime time.
payload = pack('>Q', (embeddedTime))
payload += '\x00\x00\x00\x01' # object type: pubkey
payload += encodeVarint(addressVersionNumber) # Address version number
payload += encodeVarint(streamNumber)
# bitfield of features supported by me (see the wiki).
payload += protocol.getBitfield(myAddress)
try:
# , privEncryptionKeyHex
privSigningKeyHex, _, pubSigningKey, pubEncryptionKey = \
self._getKeysForAddress(myAddress)
except Exception as err:
logger.error(
'Error within sendOutOrStoreMyV3Pubkey. Could not read'
' the keys from the keys.dat file for a requested'
' address. %s\n', err
)
return
payload += pubSigningKey + pubEncryptionKey
payload += encodeVarint(BMConfigParser().getint(
myAddress, 'noncetrialsperbyte'))
payload += encodeVarint(BMConfigParser().getint(
myAddress, 'payloadlengthextrabytes'))
signature = highlevelcrypto.sign(payload, privSigningKeyHex)
payload += encodeVarint(len(signature))
payload += signature
# Do the POW for this pubkey message
payload = self._doPOWDefaults(
payload, TTL, log_prefix='(For pubkey message)')
inventoryHash = calculateInventoryHash(payload)
objectType = 1
Inventory()[inventoryHash] = (
objectType, streamNumber, payload, embeddedTime, '')
logger.info('broadcasting inv with hash: %s', hexlify(inventoryHash))
queues.invQueue.put((streamNumber, inventoryHash))
queues.UISignalQueue.put(('updateStatusBar', ''))
9 years ago
try:
BMConfigParser().set(
9 years ago
myAddress, 'lastpubkeysendtime', str(int(time.time())))
BMConfigParser().save()
9 years ago
except:
# The user deleted the address out of the keys.dat file
# before this finished.
9 years ago
pass
def sendOutOrStoreMyV4Pubkey(self, myAddress):
"""
It doesn't send directly anymore. It put is to a queue for another thread to send at an appropriate time,
whereas in the past it directly appended it to the outgoing buffer, I think. Same with all the other methods in
this class.
"""
if not BMConfigParser().has_section(myAddress):
# The address has been deleted.
9 years ago
return
if shared.BMConfigParser().safeGetBoolean(myAddress, 'chan'):
logger.info('This is a chan address. Not sending pubkey.')
return
_, addressVersionNumber, streamNumber, addressHash = decodeAddress(
myAddress)
# 28 days from now plus or minus five minutes
TTL = int(28 * 24 * 60 * 60 + helper_random.randomrandrange(-300, 300))
embeddedTime = int(time.time() + TTL)
payload = pack('>Q', (embeddedTime))
payload += '\x00\x00\x00\x01' # object type: pubkey
payload += encodeVarint(addressVersionNumber) # Address version number
payload += encodeVarint(streamNumber)
dataToEncrypt = protocol.getBitfield(myAddress)
try:
# , privEncryptionKeyHex
privSigningKeyHex, _, pubSigningKey, pubEncryptionKey = \
self._getKeysForAddress(myAddress)
except Exception as err:
logger.error(
'Error within sendOutOrStoreMyV4Pubkey. Could not read'
' the keys from the keys.dat file for a requested'
' address. %s\n', err
)
return
dataToEncrypt += pubSigningKey + pubEncryptionKey
dataToEncrypt += encodeVarint(BMConfigParser().getint(
myAddress, 'noncetrialsperbyte'))
dataToEncrypt += encodeVarint(BMConfigParser().getint(
myAddress, 'payloadlengthextrabytes'))
# When we encrypt, we'll use a hash of the data
# contained in an address as a decryption key. This way
# in order to read the public keys in a pubkey message,
# a node must know the address first. We'll also tag,
# unencrypted, the pubkey with part of the hash so that nodes
# know which pubkey object to try to decrypt
# when they want to send a message.
doubleHashOfAddressData = hashlib.sha512(hashlib.sha512(
encodeVarint(addressVersionNumber) +
encodeVarint(streamNumber) + addressHash
).digest()).digest()
payload += doubleHashOfAddressData[32:] # the tag
signature = highlevelcrypto.sign(
payload + dataToEncrypt, privSigningKeyHex
)
dataToEncrypt += encodeVarint(len(signature))
dataToEncrypt += signature
privEncryptionKey = doubleHashOfAddressData[:32]
pubEncryptionKey = highlevelcrypto.pointMult(privEncryptionKey)
payload += highlevelcrypto.encrypt(
dataToEncrypt, hexlify(pubEncryptionKey))
# Do the POW for this pubkey message
payload = self._doPOWDefaults(
payload, TTL, log_prefix='(For pubkey message)')
inventoryHash = calculateInventoryHash(payload)
objectType = 1
Inventory()[inventoryHash] = (
objectType, streamNumber, payload, embeddedTime,
doubleHashOfAddressData[32:]
)
logger.info('broadcasting inv with hash: %s', hexlify(inventoryHash))
queues.invQueue.put((streamNumber, inventoryHash))
queues.UISignalQueue.put(('updateStatusBar', ''))
try:
BMConfigParser().set(
myAddress, 'lastpubkeysendtime', str(int(time.time())))
BMConfigParser().save()
except Exception as err:
logger.error(
'Error: Couldn\'t add the lastpubkeysendtime'
' to the keys.dat file. Error message: %s', err
)
def sendOnionPeerObj(self, peer):
"""Send onionpeer object representing peer"""
TTL = int(7 * 24 * 60 * 60 + helper_random.randomrandrange(-300, 300))
embeddedTime = int(time.time() + TTL)
streamNumber = 1 # Don't know yet what should be here
objectType = protocol.OBJECT_ONIONPEER
# FIXME: ideally the objectPayload should be signed
objectPayload = encodeVarint(peer.port) + protocol.encodeHost(peer.host)
tag = calculateInventoryHash(objectPayload)
if Inventory().by_type_and_tag(objectType, tag):
return # not expired
payload = pack('>Q', embeddedTime)
payload += pack('>I', objectType)
payload += encodeVarint(2 if len(peer.host) == 22 else 3)
payload += encodeVarint(streamNumber)
payload += objectPayload
payload = self._doPOWDefaults(
payload, TTL, log_prefix='(For onionpeer object)')
inventoryHash = calculateInventoryHash(payload)
Inventory()[inventoryHash] = (
objectType, streamNumber, buffer(payload),
embeddedTime, buffer(tag)
)
logger.info(
'sending inv (within sendOnionPeerObj function) for object: %s',
hexlify(inventoryHash))
queues.invQueue.put((streamNumber, inventoryHash))
def sendBroadcast(self):
"""Send a broadcast-type object (assemble the object, perform PoW and put it to the inv announcement queue)"""
# Reset just in case
sqlExecute(
'''UPDATE sent SET status='broadcastqueued' '''
'''WHERE status = 'doingbroadcastpow' ''')
queryreturn = sqlQuery(
'''SELECT fromaddress, subject, message, '''
''' ackdata, ttl, encodingtype FROM sent '''
''' WHERE status=? and folder='sent' ''', 'broadcastqueued')
for row in queryreturn:
fromaddress, subject, body, ackdata, TTL, encoding = row
# status
_, addressVersionNumber, streamNumber, ripe = \
decodeAddress(fromaddress)
if addressVersionNumber <= 1:
logger.error(
'Error: In the singleWorker thread, the '
' sendBroadcast function doesn\'t understand'
' the address version.\n')
return
# We need to convert our private keys to public keys in order
# to include them.
try:
# , privEncryptionKeyHex
privSigningKeyHex, _, pubSigningKey, pubEncryptionKey = \
self._getKeysForAddress(fromaddress)
except:
queues.UISignalQueue.put((
'updateSentItemStatusByAckdata', (
ackdata,
tr._translate(
"MainWindow",
"Error! Could not find sender address"
" (your address) in the keys.dat file."))
))
continue
sqlExecute(
'''UPDATE sent SET status='doingbroadcastpow' '''
''' WHERE ackdata=? AND status='broadcastqueued' ''',
ackdata)
# At this time these pubkeys are 65 bytes long
# because they include the encoding byte which we won't
# be sending in the broadcast message.
# pubSigningKey = \
# highlevelcrypto.privToPub(privSigningKeyHex).decode('hex')
if TTL > 28 * 24 * 60 * 60:
TTL = 28 * 24 * 60 * 60
if TTL < 60 * 60:
TTL = 60 * 60
# add some randomness to the TTL
TTL = int(TTL + helper_random.randomrandrange(-300, 300))
embeddedTime = int(time.time() + TTL)
payload = pack('>Q', embeddedTime)
payload += '\x00\x00\x00\x03' # object type: broadcast
if addressVersionNumber <= 3:
payload += encodeVarint(4) # broadcast version
else:
payload += encodeVarint(5) # broadcast version
payload += encodeVarint(streamNumber)
if addressVersionNumber >= 4:
doubleHashOfAddressData = hashlib.sha512(hashlib.sha512(
encodeVarint(addressVersionNumber) +
encodeVarint(streamNumber) + ripe
).digest()).digest()
tag = doubleHashOfAddressData[32:]
payload += tag
else:
tag = ''
dataToEncrypt = encodeVarint(addressVersionNumber)
dataToEncrypt += encodeVarint(streamNumber)
# behavior bitfield
dataToEncrypt += protocol.getBitfield(fromaddress)
dataToEncrypt += pubSigningKey + pubEncryptionKey
if addressVersionNumber >= 3:
dataToEncrypt += encodeVarint(BMConfigParser().getint(
fromaddress, 'noncetrialsperbyte'))
dataToEncrypt += encodeVarint(BMConfigParser().getint(
fromaddress, 'payloadlengthextrabytes'))
# message encoding type
dataToEncrypt += encodeVarint(encoding)
encodedMessage = helper_msgcoding.MsgEncode(
{"subject": subject, "body": body}, encoding)
dataToEncrypt += encodeVarint(encodedMessage.length)
dataToEncrypt += encodedMessage.data
dataToSign = payload + dataToEncrypt
signature = highlevelcrypto.sign(
dataToSign, privSigningKeyHex)
dataToEncrypt += encodeVarint(len(signature))
dataToEncrypt += signature
# Encrypt the broadcast with the information
# contained in the broadcaster's address.
# Anyone who knows the address can generate
# the private encryption key to decrypt the broadcast.
# This provides virtually no privacy; its purpose is to keep
# questionable and illegal content from flowing through the
# Internet connections and being stored on the disk of 3rd parties.
if addressVersionNumber <= 3:
privEncryptionKey = hashlib.sha512(
encodeVarint(addressVersionNumber) +
encodeVarint(streamNumber) + ripe
).digest()[:32]
else:
privEncryptionKey = doubleHashOfAddressData[:32]
pubEncryptionKey = highlevelcrypto.pointMult(privEncryptionKey)
payload += highlevelcrypto.encrypt(
dataToEncrypt, hexlify(pubEncryptionKey))
queues.UISignalQueue.put((
'updateSentItemStatusByAckdata', (
ackdata,
tr._translate(
"MainWindow",
"Doing work necessary to send broadcast..."))
))
payload = self._doPOWDefaults(