445 lines
17 KiB
Python
445 lines
17 KiB
Python
"""
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TCP protocol handler
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"""
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# pylint: disable=too-many-ancestors
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import l10n
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import logging
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import math
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import random
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import socket
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import time
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import addresses
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import asyncore_pollchoose as asyncore
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import connectionpool
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import helper_random
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import knownnodes
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import protocol
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import state
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from bmconfigparser import BMConfigParser
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from helper_random import randomBytes
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from inventory import Inventory
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from network.advanceddispatcher import AdvancedDispatcher
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from network.assemble import assemble_addr
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from network.bmproto import BMProto
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from network.constants import MAX_OBJECT_COUNT
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from network.dandelion import Dandelion
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from network.objectracker import ObjectTracker
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from network.socks4a import Socks4aConnection
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from network.socks5 import Socks5Connection
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from network.tls import TLSDispatcher
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from node import Peer
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from queues import invQueue, receiveDataQueue, UISignalQueue
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from tr import _translate
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logger = logging.getLogger('default')
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maximumAgeOfNodesThatIAdvertiseToOthers = 10800 #: Equals three hours
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maximumTimeOffsetWrongCount = 3 #: Connections with wrong time offset
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class TCPConnection(BMProto, TLSDispatcher):
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# pylint: disable=too-many-instance-attributes
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"""
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.. todo:: Look to understand and/or fix the non-parent-init-called
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"""
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def __init__(self, address=None, sock=None):
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BMProto.__init__(self, address=address, sock=sock)
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self.verackReceived = False
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self.verackSent = False
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self.streams = [0]
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self.fullyEstablished = False
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self.connectedAt = 0
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self.skipUntil = 0
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if address is None and sock is not None:
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self.destination = Peer(*sock.getpeername())
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self.isOutbound = False
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TLSDispatcher.__init__(self, sock, server_side=True)
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self.connectedAt = time.time()
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logger.debug(
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'Received connection from %s:%i',
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self.destination.host, self.destination.port)
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self.nodeid = randomBytes(8)
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elif address is not None and sock is not None:
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TLSDispatcher.__init__(self, sock, server_side=False)
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self.isOutbound = True
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logger.debug(
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'Outbound proxy connection to %s:%i',
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self.destination.host, self.destination.port)
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else:
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self.destination = address
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self.isOutbound = True
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self.create_socket(
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socket.AF_INET6 if ":" in address.host else socket.AF_INET,
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socket.SOCK_STREAM)
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self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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TLSDispatcher.__init__(self, sock, server_side=False)
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self.connect(self.destination)
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logger.debug(
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'Connecting to %s:%i',
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self.destination.host, self.destination.port)
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try:
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self.local = (
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protocol.checkIPAddress(
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protocol.encodeHost(self.destination.host), True)
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and not protocol.checkSocksIP(self.destination.host)
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)
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except socket.error:
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# it's probably a hostname
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pass
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self.network_group = protocol.network_group(self.destination.host)
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ObjectTracker.__init__(self) # pylint: disable=non-parent-init-called
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self.bm_proto_reset()
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self.set_state("bm_header", expectBytes=protocol.Header.size)
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def antiIntersectionDelay(self, initial=False):
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"""
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This is a defense against the so called intersection attacks.
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It is called when you notice peer is requesting non-existing
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objects, or right after the connection is established. It will
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estimate how long an object will take to propagate across the
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network, and skip processing "getdata" requests until then. This
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means an attacker only has one shot per IP to perform the attack.
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"""
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# estimated time for a small object to propagate across the
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# whole network
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max_known_nodes = max(
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len(knownnodes.knownNodes[x]) for x in knownnodes.knownNodes)
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delay = math.ceil(math.log(max_known_nodes + 2, 20)) * (
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0.2 + invQueue.queueCount / 2.0)
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# take the stream with maximum amount of nodes
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# +2 is to avoid problems with log(0) and log(1)
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# 20 is avg connected nodes count
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# 0.2 is avg message transmission time
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if delay > 0:
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if initial:
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self.skipUntil = self.connectedAt + delay
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if self.skipUntil > time.time():
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logger.debug(
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'Initial skipping processing getdata for %.2fs',
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self.skipUntil - time.time())
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else:
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logger.debug(
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'Skipping processing getdata due to missing object'
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' for %.2fs', delay)
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self.skipUntil = time.time() + delay
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def checkTimeOffsetNotification(self):
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"""
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Check if we have connected to too many nodes which have too high
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time offset from us
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"""
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if BMProto.timeOffsetWrongCount > \
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maximumTimeOffsetWrongCount and \
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not self.fullyEstablished:
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UISignalQueue.put((
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'updateStatusBar',
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_translate(
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"MainWindow",
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"The time on your computer, %1, may be wrong. "
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"Please verify your settings."
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).arg(l10n.formatTimestamp())))
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def state_connection_fully_established(self):
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"""
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State after the bitmessage protocol handshake is completed
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(version/verack exchange, and if both side support TLS,
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the TLS handshake as well).
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"""
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self.set_connection_fully_established()
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self.set_state("bm_header")
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self.bm_proto_reset()
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return True
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def set_connection_fully_established(self):
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"""Initiate inventory synchronisation."""
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if not self.isOutbound and not self.local:
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state.clientHasReceivedIncomingConnections = True
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UISignalQueue.put(('setStatusIcon', 'green'))
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UISignalQueue.put((
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'updateNetworkStatusTab', (self.isOutbound, True, self.destination)
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))
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self.antiIntersectionDelay(True)
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self.fullyEstablished = True
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# The connection having host suitable for knownnodes
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if self.isOutbound or not self.local and not state.socksIP:
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knownnodes.increaseRating(self.destination)
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knownnodes.addKnownNode(
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self.streams, self.destination, time.time())
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Dandelion().maybeAddStem(self)
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self.sendAddr()
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self.sendBigInv()
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def sendAddr(self):
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"""Send a partial list of known addresses to peer."""
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# We are going to share a maximum number of 1000 addrs (per overlapping
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# stream) with our peer. 500 from overlapping streams, 250 from the
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# left child stream, and 250 from the right child stream.
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maxAddrCount = BMConfigParser().safeGetInt(
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"bitmessagesettings", "maxaddrperstreamsend", 500)
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templist = []
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addrs = {}
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for stream in self.streams:
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with knownnodes.knownNodesLock:
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for n, s in enumerate((stream, stream * 2, stream * 2 + 1)):
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nodes = knownnodes.knownNodes.get(s)
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if not nodes:
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continue
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# only if more recent than 3 hours
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# and having positive or neutral rating
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filtered = [
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(k, v) for k, v in nodes.iteritems()
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if v["lastseen"] > int(time.time())
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- maximumAgeOfNodesThatIAdvertiseToOthers
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and v["rating"] >= 0 and len(k.host) <= 22
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]
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# sent 250 only if the remote isn't interested in it
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elemCount = min(
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len(filtered),
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maxAddrCount / 2 if n else maxAddrCount)
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addrs[s] = helper_random.randomsample(filtered, elemCount)
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for substream in addrs:
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for peer, params in addrs[substream]:
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templist.append((substream, peer, params["lastseen"]))
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if templist:
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self.append_write_buf(assemble_addr(templist))
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def sendBigInv(self):
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"""
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Send hashes of all inventory objects, chunked as the protocol has
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a per-command limit.
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"""
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def sendChunk():
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"""Send one chunk of inv entries in one command"""
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if objectCount == 0:
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return
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logger.debug(
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'Sending huge inv message with %i objects to just this'
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' one peer', objectCount)
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self.append_write_buf(protocol.CreatePacket(
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'inv', addresses.encodeVarint(objectCount) + payload))
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# Select all hashes for objects in this stream.
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bigInvList = {}
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for stream in self.streams:
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# may lock for a long time, but I think it's better than
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# thousands of small locks
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with self.objectsNewToThemLock:
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for objHash in Inventory().unexpired_hashes_by_stream(stream):
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# don't advertise stem objects on bigInv
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if Dandelion().hasHash(objHash):
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continue
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bigInvList[objHash] = 0
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objectCount = 0
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payload = b''
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# Now let us start appending all of these hashes together.
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# They will be sent out in a big inv message to our new peer.
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for obj_hash, _ in bigInvList.items():
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payload += obj_hash
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objectCount += 1
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# Remove -1 below when sufficient time has passed for users to
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# upgrade to versions of PyBitmessage that accept inv with 50,000
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# items
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if objectCount >= MAX_OBJECT_COUNT - 1:
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sendChunk()
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payload = b''
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objectCount = 0
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# flush
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sendChunk()
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def handle_connect(self):
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"""Callback for TCP connection being established."""
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try:
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AdvancedDispatcher.handle_connect(self)
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except socket.error as e:
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# pylint: disable=protected-access
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if e.errno in asyncore._DISCONNECTED:
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logger.debug(
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'%s:%i: Connection failed: %s',
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self.destination.host, self.destination.port, e)
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return
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self.nodeid = randomBytes(8)
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self.append_write_buf(
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protocol.assembleVersionMessage(
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self.destination.host, self.destination.port,
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connectionpool.BMConnectionPool().streams,
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False, nodeid=self.nodeid))
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self.connectedAt = time.time()
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receiveDataQueue.put(self.destination)
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def handle_read(self):
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"""Callback for reading from a socket"""
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TLSDispatcher.handle_read(self)
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receiveDataQueue.put(self.destination)
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def handle_write(self):
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"""Callback for writing to a socket"""
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TLSDispatcher.handle_write(self)
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def handle_close(self):
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"""Callback for connection being closed."""
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host_is_global = self.isOutbound or not self.local and not state.socksIP
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if self.fullyEstablished:
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UISignalQueue.put((
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'updateNetworkStatusTab',
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(self.isOutbound, False, self.destination)
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))
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if host_is_global:
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knownnodes.addKnownNode(
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self.streams, self.destination, time.time())
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Dandelion().maybeRemoveStem(self)
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else:
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self.checkTimeOffsetNotification()
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if host_is_global:
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knownnodes.decreaseRating(self.destination)
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BMProto.handle_close(self)
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class Socks5BMConnection(Socks5Connection, TCPConnection):
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"""SOCKS5 wrapper for TCP connections"""
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def __init__(self, address):
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Socks5Connection.__init__(self, address=address)
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TCPConnection.__init__(self, address=address, sock=self.socket)
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self.set_state("init")
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def state_proxy_handshake_done(self):
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"""
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State when SOCKS5 connection succeeds, we need to send a
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Bitmessage handshake to peer.
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"""
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Socks5Connection.state_proxy_handshake_done(self)
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self.nodeid = randomBytes(8)
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self.append_write_buf(
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protocol.assembleVersionMessage(
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self.destination.host, self.destination.port,
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connectionpool.BMConnectionPool().streams,
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False, nodeid=self.nodeid))
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self.set_state("bm_header", expectBytes=protocol.Header.size)
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return True
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class Socks4aBMConnection(Socks4aConnection, TCPConnection):
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"""SOCKS4a wrapper for TCP connections"""
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def __init__(self, address):
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Socks4aConnection.__init__(self, address=address)
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TCPConnection.__init__(self, address=address, sock=self.socket)
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self.set_state("init")
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def state_proxy_handshake_done(self):
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"""
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State when SOCKS4a connection succeeds, we need to send a
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Bitmessage handshake to peer.
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"""
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Socks4aConnection.state_proxy_handshake_done(self)
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self.nodeid = randomBytes(8)
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self.append_write_buf(
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protocol.assembleVersionMessage(
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self.destination.host, self.destination.port,
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connectionpool.BMConnectionPool().streams,
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False, nodeid=self.nodeid))
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self.set_state("bm_header", expectBytes=protocol.Header.size)
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return True
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def bootstrap(connection_class):
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"""Make bootstrapper class for connection type (connection_class)"""
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class Bootstrapper(connection_class):
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"""Base class for bootstrappers"""
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_connection_base = connection_class
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def __init__(self, host, port):
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self._connection_base.__init__(self, Peer(host, port))
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self.close_reason = self._succeed = False
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def bm_command_addr(self):
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"""
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Got addr message - the bootstrap succeed.
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Let BMProto process the addr message and switch state to 'close'
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"""
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BMProto.bm_command_addr(self)
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self._succeed = True
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# pylint: disable=attribute-defined-outside-init
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self.close_reason = "Thanks for bootstrapping!"
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self.set_state("close")
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def handle_close(self):
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"""
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After closing the connection switch knownnodes.knownNodesActual
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back to False if the bootstrapper failed.
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"""
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self._connection_base.handle_close(self)
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if not self._succeed:
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knownnodes.knownNodesActual = False
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return Bootstrapper
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class TCPServer(AdvancedDispatcher):
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"""TCP connection server for Bitmessage protocol"""
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def __init__(self, host='127.0.0.1', port=8444):
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if not hasattr(self, '_map'):
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AdvancedDispatcher.__init__(self)
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self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
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self.set_reuse_addr()
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for attempt in range(50):
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try:
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if attempt > 0:
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logger.warning('Failed to bind on port %s', port)
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port = random.randint(32767, 65535)
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self.bind((host, port))
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except socket.error as e:
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if e.errno in (asyncore.EADDRINUSE, asyncore.WSAEADDRINUSE):
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continue
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else:
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if attempt > 0:
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logger.warning('Setting port to %s', port)
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BMConfigParser().set(
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'bitmessagesettings', 'port', str(port))
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BMConfigParser().save()
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break
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self.destination = Peer(host, port)
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self.bound = True
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self.listen(5)
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def is_bound(self):
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"""Is the socket bound?"""
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try:
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return self.bound
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except AttributeError:
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return False
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def handle_accept(self):
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"""Incoming connection callback"""
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try:
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sock = self.accept()[0]
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except (TypeError, IndexError):
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return
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state.ownAddresses[Peer(*sock.getsockname())] = True
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if (
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len(connectionpool.BMConnectionPool())
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> BMConfigParser().safeGetInt(
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'bitmessagesettings', 'maxtotalconnections')
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+ BMConfigParser().safeGetInt(
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'bitmessagesettings', 'maxbootstrapconnections') + 10
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):
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# 10 is a sort of buffer, in between it will go through
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# the version handshake and return an error to the peer
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logger.warning("Server full, dropping connection")
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sock.close()
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return
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try:
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connectionpool.BMConnectionPool().addConnection(
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TCPConnection(sock=sock))
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except socket.error:
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pass
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