481 lines
23 KiB
Python
481 lines
23 KiB
Python
softwareVersion = '0.4.1'
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verbose = 1
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maximumAgeOfAnObjectThatIAmWillingToAccept = 216000 # Equals two days and 12 hours.
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lengthOfTimeToLeaveObjectsInInventory = 237600 # Equals two days and 18 hours. This should be longer than maximumAgeOfAnObjectThatIAmWillingToAccept so that we don't process messages twice.
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lengthOfTimeToHoldOnToAllPubkeys = 2419200 # Equals 4 weeks. You could make this longer if you want but making it shorter would not be advisable because there is a very small possibility that it could keep you from obtaining a needed pubkey for a period of time.
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maximumAgeOfObjectsThatIAdvertiseToOthers = 216000 # Equals two days and 12 hours
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maximumAgeOfNodesThatIAdvertiseToOthers = 10800 # Equals three hours
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useVeryEasyProofOfWorkForTesting = False # If you set this to True while on the normal network, you won't be able to send or sometimes receive messages.
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# Libraries.
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import collections
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import ConfigParser
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import os
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import pickle
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import Queue
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import random
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import socket
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import sys
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import stat
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import threading
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import time
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from os import path, environ
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# Project imports.
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from addresses import *
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import highlevelcrypto
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import shared
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import helper_startup
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from helper_sql import *
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config = ConfigParser.SafeConfigParser()
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myECCryptorObjects = {}
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MyECSubscriptionCryptorObjects = {}
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myAddressesByHash = {} #The key in this dictionary is the RIPE hash which is encoded in an address and value is the address itself.
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myAddressesByTag = {} # The key in this dictionary is the tag generated from the address.
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broadcastSendersForWhichImWatching = {}
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workerQueue = Queue.Queue()
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UISignalQueue = Queue.Queue()
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addressGeneratorQueue = Queue.Queue()
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knownNodesLock = threading.Lock()
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knownNodes = {}
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sendDataQueues = [] #each sendData thread puts its queue in this list.
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inventory = {} #of objects (like msg payloads and pubkey payloads) Does not include protocol headers (the first 24 bytes of each packet).
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inventoryLock = threading.Lock() #Guarantees that two receiveDataThreads don't receive and process the same message concurrently (probably sent by a malicious individual)
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printLock = threading.Lock()
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appdata = '' #holds the location of the application data storage directory
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statusIconColor = 'red'
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connectedHostsList = {} #List of hosts to which we are connected. Used to guarantee that the outgoingSynSender threads won't connect to the same remote node twice.
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shutdown = 0 #Set to 1 by the doCleanShutdown function. Used to tell the proof of work worker threads to exit.
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alreadyAttemptedConnectionsList = {
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} # This is a list of nodes to which we have already attempted a connection
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alreadyAttemptedConnectionsListLock = threading.Lock()
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alreadyAttemptedConnectionsListResetTime = int(
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time.time()) # used to clear out the alreadyAttemptedConnectionsList periodically so that we will retry connecting to hosts to which we have already tried to connect.
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numberOfObjectsThatWeHaveYetToGetPerPeer = {}
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neededPubkeys = {}
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eightBytesOfRandomDataUsedToDetectConnectionsToSelf = pack(
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'>Q', random.randrange(1, 18446744073709551615))
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successfullyDecryptMessageTimings = [
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] # A list of the amounts of time it took to successfully decrypt msg messages
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apiAddressGeneratorReturnQueue = Queue.Queue(
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) # The address generator thread uses this queue to get information back to the API thread.
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ackdataForWhichImWatching = {}
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clientHasReceivedIncomingConnections = False #used by API command clientStatus
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numberOfMessagesProcessed = 0
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numberOfBroadcastsProcessed = 0
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numberOfPubkeysProcessed = 0
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numberOfInventoryLookupsPerformed = 0
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daemon = False
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inventorySets = {} # key = streamNumer, value = a set which holds the inventory object hashes that we are aware of. This is used whenever we receive an inv message from a peer to check to see what items are new to us. We don't delete things out of it; instead, the singleCleaner thread clears and refills it every couple hours.
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needToWriteKnownNodesToDisk = False # If True, the singleCleaner will write it to disk eventually.
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maximumLengthOfTimeToBotherResendingMessages = 0
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#If changed, these values will cause particularly unexpected behavior: You won't be able to either send or receive messages because the proof of work you do (or demand) won't match that done or demanded by others. Don't change them!
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networkDefaultProofOfWorkNonceTrialsPerByte = 320 #The amount of work that should be performed (and demanded) per byte of the payload. Double this number to double the work.
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networkDefaultPayloadLengthExtraBytes = 14000 #To make sending short messages a little more difficult, this value is added to the payload length for use in calculating the proof of work target.
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# Remember here the RPC port read from namecoin.conf so we can restore to
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# it as default whenever the user changes the "method" selection for
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# namecoin integration to "namecoind".
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namecoinDefaultRpcPort = "8336"
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# When using py2exe or py2app, the variable frozen is added to the sys
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# namespace. This can be used to setup a different code path for
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# binary distributions vs source distributions.
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frozen = getattr(sys,'frozen', None)
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def isInSqlInventory(hash):
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queryreturn = sqlQuery('''select hash from inventory where hash=?''', hash)
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if queryreturn == []:
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return False
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else:
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return True
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def assembleVersionMessage(remoteHost, remotePort, myStreamNumber):
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payload = ''
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payload += pack('>L', 2) # protocol version.
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payload += pack('>q', 1) # bitflags of the services I offer.
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payload += pack('>q', int(time.time()))
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payload += pack(
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'>q', 1) # boolservices of remote connection. How can I even know this for sure? This is probably ignored by the remote host.
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payload += '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF' + \
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socket.inet_aton(remoteHost)
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payload += pack('>H', remotePort) # remote IPv6 and port
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payload += pack('>q', 1) # bitflags of the services I offer.
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payload += '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF' + pack(
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'>L', 2130706433) # = 127.0.0.1. This will be ignored by the remote host. The actual remote connected IP will be used.
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payload += pack('>H', shared.config.getint(
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'bitmessagesettings', 'port')) # my external IPv6 and port
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random.seed()
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payload += eightBytesOfRandomDataUsedToDetectConnectionsToSelf
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userAgent = '/PyBitmessage:' + shared.softwareVersion + '/'
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payload += encodeVarint(len(userAgent))
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payload += userAgent
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payload += encodeVarint(
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1) # The number of streams about which I care. PyBitmessage currently only supports 1 per connection.
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payload += encodeVarint(myStreamNumber)
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datatosend = '\xe9\xbe\xb4\xd9' # magic bits, slighly different from Bitcoin's magic bits.
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datatosend = datatosend + 'version\x00\x00\x00\x00\x00' # version command
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datatosend = datatosend + pack('>L', len(payload)) # payload length
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datatosend = datatosend + hashlib.sha512(payload).digest()[0:4]
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return datatosend + payload
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def lookupAppdataFolder():
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APPNAME = "PyBitmessage"
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from os import path, environ
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if "BITMESSAGE_HOME" in environ:
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dataFolder = environ["BITMESSAGE_HOME"]
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if dataFolder[-1] not in [os.path.sep, os.path.altsep]:
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dataFolder += os.path.sep
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elif sys.platform == 'darwin':
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if "HOME" in environ:
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dataFolder = path.join(os.environ["HOME"], "Library/Application Support/", APPNAME) + '/'
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else:
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stringToLog = 'Could not find home folder, please report this message and your OS X version to the BitMessage Github.'
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if 'logger' in globals():
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logger.critical(stringToLog)
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else:
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print stringToLog
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sys.exit()
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elif 'win32' in sys.platform or 'win64' in sys.platform:
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dataFolder = path.join(environ['APPDATA'].decode(sys.getfilesystemencoding(), 'ignore'), APPNAME) + path.sep
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else:
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from shutil import move
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try:
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dataFolder = path.join(environ["XDG_CONFIG_HOME"], APPNAME)
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except KeyError:
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dataFolder = path.join(environ["HOME"], ".config", APPNAME)
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# Migrate existing data to the proper location if this is an existing install
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try:
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move(path.join(environ["HOME"], ".%s" % APPNAME), dataFolder)
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stringToLog = "Moving data folder to %s" % (dataFolder)
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if 'logger' in globals():
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logger.info(stringToLog)
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else:
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print stringToLog
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except IOError:
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# Old directory may not exist.
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pass
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dataFolder = dataFolder + '/'
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return dataFolder
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def isAddressInMyAddressBook(address):
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queryreturn = sqlQuery(
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'''select address from addressbook where address=?''',
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address)
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return queryreturn != []
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#At this point we should really just have a isAddressInMy(book, address)...
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def isAddressInMySubscriptionsList(address):
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queryreturn = sqlQuery(
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'''select * from subscriptions where address=?''',
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str(address))
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return queryreturn != []
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def isAddressInMyAddressBookSubscriptionsListOrWhitelist(address):
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if isAddressInMyAddressBook(address):
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return True
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queryreturn = sqlQuery('''SELECT address FROM whitelist where address=? and enabled = '1' ''', address)
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if queryreturn <> []:
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return True
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queryreturn = sqlQuery(
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'''select address from subscriptions where address=? and enabled = '1' ''',
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address)
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if queryreturn <> []:
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return True
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return False
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def safeConfigGetBoolean(section,field):
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try:
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return config.getboolean(section,field)
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except Exception, err:
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return False
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def decodeWalletImportFormat(WIFstring):
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fullString = arithmetic.changebase(WIFstring,58,256)
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privkey = fullString[:-4]
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if fullString[-4:] != hashlib.sha256(hashlib.sha256(privkey).digest()).digest()[:4]:
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logger.critical('Major problem! When trying to decode one of your private keys, the checksum '
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'failed. Here is the PRIVATE key: %s' % str(WIFstring))
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return ""
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else:
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#checksum passed
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if privkey[0] == '\x80':
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return privkey[1:]
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else:
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logger.critical('Major problem! When trying to decode one of your private keys, the '
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'checksum passed but the key doesn\'t begin with hex 80. Here is the '
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'PRIVATE key: %s' % str(WIFstring))
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return ""
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def reloadMyAddressHashes():
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logger.debug('reloading keys from keys.dat file')
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myECCryptorObjects.clear()
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myAddressesByHash.clear()
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myAddressesByTag.clear()
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#myPrivateKeys.clear()
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keyfileSecure = checkSensitiveFilePermissions(appdata + 'keys.dat')
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configSections = config.sections()
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hasEnabledKeys = False
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for addressInKeysFile in configSections:
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if addressInKeysFile <> 'bitmessagesettings':
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isEnabled = config.getboolean(addressInKeysFile, 'enabled')
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if isEnabled:
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hasEnabledKeys = True
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status,addressVersionNumber,streamNumber,hash = decodeAddress(addressInKeysFile)
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if addressVersionNumber == 2 or addressVersionNumber == 3 or addressVersionNumber == 4:
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# Returns a simple 32 bytes of information encoded in 64 Hex characters,
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# or null if there was an error.
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privEncryptionKey = decodeWalletImportFormat(
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config.get(addressInKeysFile, 'privencryptionkey')).encode('hex')
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if len(privEncryptionKey) == 64:#It is 32 bytes encoded as 64 hex characters
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myECCryptorObjects[hash] = highlevelcrypto.makeCryptor(privEncryptionKey)
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myAddressesByHash[hash] = addressInKeysFile
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tag = hashlib.sha512(hashlib.sha512(encodeVarint(
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addressVersionNumber) + encodeVarint(streamNumber) + hash).digest()).digest()[32:]
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myAddressesByTag[tag] = addressInKeysFile
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else:
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logger.error('Error in reloadMyAddressHashes: Can\'t handle address versions other than 2, 3, or 4.\n')
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if not keyfileSecure:
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fixSensitiveFilePermissions(appdata + 'keys.dat', hasEnabledKeys)
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def reloadBroadcastSendersForWhichImWatching():
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broadcastSendersForWhichImWatching.clear()
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MyECSubscriptionCryptorObjects.clear()
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queryreturn = sqlQuery('SELECT address FROM subscriptions where enabled=1')
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logger.debug('reloading subscriptions...')
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for row in queryreturn:
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address, = row
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status,addressVersionNumber,streamNumber,hash = decodeAddress(address)
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if addressVersionNumber == 2:
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broadcastSendersForWhichImWatching[hash] = 0
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#Now, for all addresses, even version 2 addresses, we should create Cryptor objects in a dictionary which we will use to attempt to decrypt encrypted broadcast messages.
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if addressVersionNumber <= 3:
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privEncryptionKey = hashlib.sha512(encodeVarint(addressVersionNumber)+encodeVarint(streamNumber)+hash).digest()[:32]
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MyECSubscriptionCryptorObjects[hash] = highlevelcrypto.makeCryptor(privEncryptionKey.encode('hex'))
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else:
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doubleHashOfAddressData = hashlib.sha512(hashlib.sha512(encodeVarint(
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addressVersionNumber) + encodeVarint(streamNumber) + hash).digest()).digest()
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tag = doubleHashOfAddressData[32:]
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privEncryptionKey = doubleHashOfAddressData[:32]
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MyECSubscriptionCryptorObjects[tag] = highlevelcrypto.makeCryptor(privEncryptionKey.encode('hex'))
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def doCleanShutdown():
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global shutdown
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shutdown = 1 #Used to tell proof of work worker threads to exit.
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broadcastToSendDataQueues((0, 'shutdown', 'all'))
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knownNodesLock.acquire()
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UISignalQueue.put(('updateStatusBar','Saving the knownNodes list of peers to disk...'))
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output = open(appdata + 'knownnodes.dat', 'wb')
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logger.info('finished opening knownnodes.dat. Now pickle.dump')
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pickle.dump(knownNodes, output)
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logger.info('Completed pickle.dump. Closing output...')
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output.close()
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knownNodesLock.release()
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logger.info('Finished closing knownnodes.dat output file.')
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UISignalQueue.put(('updateStatusBar','Done saving the knownNodes list of peers to disk.'))
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logger.info('Flushing inventory in memory out to disk...')
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UISignalQueue.put((
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'updateStatusBar',
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'Flushing inventory in memory out to disk. This should normally only take a second...'))
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flushInventory()
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# This one last useless query will guarantee that the previous flush committed before we close
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# the program.
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sqlQuery('SELECT address FROM subscriptions')
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sqlStoredProcedure('exit')
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logger.info('Finished flushing inventory.')
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# Wait long enough to guarantee that any running proof of work worker threads will check the
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# shutdown variable and exit. If the main thread closes before they do then they won't stop.
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time.sleep(.25)
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if safeConfigGetBoolean('bitmessagesettings','daemon'):
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logger.info('Clean shutdown complete.')
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os._exit(0)
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# When you want to command a sendDataThread to do something, like shutdown or send some data, this
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# function puts your data into the queues for each of the sendDataThreads. The sendDataThreads are
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# responsible for putting their queue into (and out of) the sendDataQueues list.
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def broadcastToSendDataQueues(data):
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# logger.debug('running broadcastToSendDataQueues')
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for q in sendDataQueues:
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q.put(data)
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def flushInventory():
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#Note that the singleCleanerThread clears out the inventory dictionary from time to time, although it only clears things that have been in the dictionary for a long time. This clears the inventory dictionary Now.
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with SqlBulkExecute() as sql:
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for hash, storedValue in inventory.items():
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objectType, streamNumber, payload, receivedTime, tag = storedValue
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sql.execute('''INSERT INTO inventory VALUES (?,?,?,?,?,?)''',
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hash,objectType,streamNumber,payload,receivedTime,tag)
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del inventory[hash]
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def fixPotentiallyInvalidUTF8Data(text):
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try:
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unicode(text,'utf-8')
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return text
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except:
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output = 'Part of the message is corrupt. The message cannot be displayed the normal way.\n\n' + repr(text)
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return output
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# Checks sensitive file permissions for inappropriate umask during keys.dat creation.
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# (Or unwise subsequent chmod.)
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#
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# Returns true iff file appears to have appropriate permissions.
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def checkSensitiveFilePermissions(filename):
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if sys.platform == 'win32':
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# TODO: This might deserve extra checks by someone familiar with
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# Windows systems.
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return True
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else:
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try:
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# Skip known problems for non-Win32 filesystems without POSIX permissions.
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import subprocess
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fstype = subprocess.check_output('stat -f -c "%%T" %s' % (filename),
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shell=True,
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stderr=subprocess.STDOUT)
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if 'fuseblk' in fstype:
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logger.info('Skipping file permissions check for %s. Filesystem fuseblk detected.',
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filename)
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return True
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except:
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# Swallow exception here, but we might run into trouble later!
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logger.error('Could not determine filesystem type. %s', filename)
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present_permissions = os.stat(filename)[0]
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disallowed_permissions = stat.S_IRWXG | stat.S_IRWXO
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return present_permissions & disallowed_permissions == 0
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# Fixes permissions on a sensitive file.
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def fixSensitiveFilePermissions(filename, hasEnabledKeys):
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if hasEnabledKeys:
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logger.warning('Keyfile had insecure permissions, and there were enabled keys. '
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'The truly paranoid should stop using them immediately.')
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else:
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logger.warning('Keyfile had insecure permissions, but there were no enabled keys.')
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try:
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present_permissions = os.stat(filename)[0]
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disallowed_permissions = stat.S_IRWXG | stat.S_IRWXO
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allowed_permissions = ((1<<32)-1) ^ disallowed_permissions
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new_permissions = (
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allowed_permissions & present_permissions)
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os.chmod(filename, new_permissions)
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logger.info('Keyfile permissions automatically fixed.')
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except Exception, e:
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logger.exception('Keyfile permissions could not be fixed.')
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raise
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def isBitSetWithinBitfield(fourByteString, n):
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# Uses MSB 0 bit numbering across 4 bytes of data
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n = 31 - n
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x, = unpack('>L', fourByteString)
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return x & 2**n != 0
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def decryptAndCheckPubkeyPayload(payload, address):
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status, addressVersion, streamNumber, ripe = decodeAddress(address)
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doubleHashOfAddressData = hashlib.sha512(hashlib.sha512(encodeVarint(
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addressVersion) + encodeVarint(streamNumber) + ripe).digest()).digest()
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# this function expects that the nonce is Not included in payload.
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readPosition = 8 # for the time
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embeddedVersionNumber, varintLength = decodeVarint(
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payload[readPosition:readPosition + 10])
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if embeddedVersionNumber != addressVersion:
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with shared.printLock:
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print 'Pubkey decryption was UNsuccessful due to address version mismatch. This shouldn\'t have happened.'
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return 'failed'
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readPosition += varintLength
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embeddedStreamNumber, varintLength = decodeVarint(
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payload[readPosition:readPosition + 10])
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if embeddedStreamNumber != streamNumber:
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with shared.printLock:
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print 'Pubkey decryption was UNsuccessful due to stream number mismatch. This shouldn\'t have happened.'
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return 'failed'
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readPosition += varintLength
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signedData = payload[:readPosition] # Some of the signed data is not encrypted so let's keep it for now.
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toTag = payload[readPosition:readPosition+32]
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readPosition += 32 #for the tag
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encryptedData = payload[readPosition:]
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# Let us try to decrypt the pubkey
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privEncryptionKey = doubleHashOfAddressData[:32]
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cryptorObject = highlevelcrypto.makeCryptor(privEncryptionKey.encode('hex'))
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try:
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decryptedData = cryptorObject.decrypt(encryptedData)
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except:
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# Someone must have encrypted some data with a different key
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# but tagged it with a tag for which we are watching.
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with shared.printLock:
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print 'Pubkey decryption was UNsuccessful. This shouldn\'t have happened.'
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return 'failed'
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print 'Pubkey decryption successful'
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readPosition = 4 # bypass the behavior bitfield
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publicSigningKey = '\x04' + decryptedData[readPosition:readPosition + 64]
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# 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, we should
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# probably test these keys here.
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readPosition += 64
|
|
publicEncryptionKey = '\x04' + decryptedData[readPosition:readPosition + 64]
|
|
readPosition += 64
|
|
specifiedNonceTrialsPerByte, specifiedNonceTrialsPerByteLength = decodeVarint(
|
|
decryptedData[readPosition:readPosition + 10])
|
|
readPosition += specifiedNonceTrialsPerByteLength
|
|
specifiedPayloadLengthExtraBytes, specifiedPayloadLengthExtraBytesLength = decodeVarint(
|
|
decryptedData[readPosition:readPosition + 10])
|
|
readPosition += specifiedPayloadLengthExtraBytesLength
|
|
signedData += decryptedData[:readPosition]
|
|
signatureLength, signatureLengthLength = decodeVarint(
|
|
decryptedData[readPosition:readPosition + 10])
|
|
readPosition += signatureLengthLength
|
|
signature = decryptedData[readPosition:readPosition + signatureLength]
|
|
try:
|
|
if not highlevelcrypto.verify(signedData, signature, publicSigningKey.encode('hex')):
|
|
print 'ECDSA verify failed (within decryptAndCheckPubkeyPayload).'
|
|
return 'failed'
|
|
print 'ECDSA verify passed (within decryptAndCheckPubkeyPayload)'
|
|
except Exception as err:
|
|
print 'ECDSA verify failed (within decryptAndCheckPubkeyPayload)', err
|
|
return 'failed'
|
|
|
|
sha = hashlib.new('sha512')
|
|
sha.update(publicSigningKey + publicEncryptionKey)
|
|
ripeHasher = hashlib.new('ripemd160')
|
|
ripeHasher.update(sha.digest())
|
|
embeddedRipe = ripeHasher.digest()
|
|
|
|
if embeddedRipe != ripe:
|
|
# Although this pubkey object had the tag were were looking for and was
|
|
# encrypted with the correct encryption key, it doesn't contain the
|
|
# correct keys. Someone is either being malicious or using buggy software.
|
|
with shared.printLock:
|
|
print 'Pubkey decryption was UNsuccessful due to RIPE mismatch. This shouldn\'t have happened.'
|
|
return 'failed'
|
|
|
|
t = (ripe, addressVersion, signedData, int(time.time()), 'yes')
|
|
sqlExecute('''INSERT INTO pubkeys VALUES (?,?,?,?,?)''', *t)
|
|
return 'successful'
|
|
|
|
Peer = collections.namedtuple('Peer', ['host', 'port'])
|
|
|
|
helper_startup.loadConfig()
|
|
from debug import logger
|