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#!/usr/bin/env python3
# Copyright (c) 2017-2021 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test message sending before handshake completion.
Before receiving a VERACK, a node should not send anything but VERSION/VERACK
and feature negotiation messages (WTXIDRELAY, SENDADDRV2).
This test connects to a node and sends it a few messages, trying to entice it
into sending us something it shouldn't."""
import time
from test_framework.messages import (
msg_getaddr,
msg_ping,
msg_version,
)
from test_framework.p2p import (
P2PInterface,
P2P_SUBVERSION,
P2P_SERVICES,
P2P_VERSION_RELAY,
)
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
assert_greater_than_or_equal,
)
PEER_TIMEOUT = 3
class LazyPeer(P2PInterface):
def __init__(self):
super().__init__()
self.unexpected_msg = False
self.ever_connected = False
self.got_wtxidrelay = False
self.got_sendaddrv2 = False
def bad_message(self, message):
self.unexpected_msg = True
print("should not have received message: %s" % message.msgtype)
def on_open(self):
self.ever_connected = True
# Does not respond to "version" with "verack"
def on_version(self, message): self.bad_message(message)
def on_verack(self, message): self.bad_message(message)
def on_inv(self, message): self.bad_message(message)
def on_addr(self, message): self.bad_message(message)
def on_getdata(self, message): self.bad_message(message)
def on_getblocks(self, message): self.bad_message(message)
def on_tx(self, message): self.bad_message(message)
def on_block(self, message): self.bad_message(message)
def on_getaddr(self, message): self.bad_message(message)
def on_headers(self, message): self.bad_message(message)
def on_getheaders(self, message): self.bad_message(message)
def on_ping(self, message): self.bad_message(message)
def on_mempool(self, message): self.bad_message(message)
def on_pong(self, message): self.bad_message(message)
def on_feefilter(self, message): self.bad_message(message)
def on_sendheaders(self, message): self.bad_message(message)
def on_sendcmpct(self, message): self.bad_message(message)
def on_cmpctblock(self, message): self.bad_message(message)
def on_getblocktxn(self, message): self.bad_message(message)
def on_blocktxn(self, message): self.bad_message(message)
def on_wtxidrelay(self, message): self.got_wtxidrelay = True
def on_sendaddrv2(self, message): self.got_sendaddrv2 = True
# Peer that sends a version but not a verack.
class NoVerackIdlePeer(LazyPeer):
def __init__(self):
self.version_received = False
super().__init__()
def on_verack(self, message): pass
# When version is received, don't reply with a verack. Instead, see if the
# node will give us a message that it shouldn't. This is not an exhaustive
# list!
def on_version(self, message):
self.version_received = True
self.send_message(msg_ping())
self.send_message(msg_getaddr())
class P2PVersionStore(P2PInterface):
version_received = None
def on_version(self, msg):
# Responds with an appropriate verack
super().on_version(msg)
self.version_received = msg
class P2PLeakTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
self.extra_args = [[f"-peertimeout={PEER_TIMEOUT}"]]
def create_old_version(self, nversion):
old_version_msg = msg_version()
old_version_msg.nVersion = nversion
old_version_msg.strSubVer = P2P_SUBVERSION
old_version_msg.nServices = P2P_SERVICES
old_version_msg.relay = P2P_VERSION_RELAY
return old_version_msg
def run_test(self):
self.log.info('Check that the node doesn\'t send unexpected messages before handshake completion')
# Peer that never sends a version, nor any other messages. It shouldn't receive anything from the node.
no_version_idle_peer = self.nodes[0].add_p2p_connection(LazyPeer(), send_version=False, wait_for_verack=False)
# Peer that sends a version but not a verack.
no_verack_idle_peer = self.nodes[0].add_p2p_connection(NoVerackIdlePeer(), wait_for_verack=False)
# Pre-wtxidRelay peer that sends a version but not a verack and does not support feature negotiation
# messages which start at nVersion == 70016
pre_wtxidrelay_peer = self.nodes[0].add_p2p_connection(NoVerackIdlePeer(), send_version=False, wait_for_verack=False)
pre_wtxidrelay_peer.send_message(self.create_old_version(70015))
# Wait until the peer gets the verack in response to the version. Though, don't wait for the node to receive the
# verack, since the peer never sent one
no_verack_idle_peer.wait_for_verack()
pre_wtxidrelay_peer.wait_for_verack()
no_version_idle_peer.wait_until(lambda: no_version_idle_peer.ever_connected)
no_verack_idle_peer.wait_until(lambda: no_verack_idle_peer.version_received)
pre_wtxidrelay_peer.wait_until(lambda: pre_wtxidrelay_peer.version_received)
# Mine a block and make sure that it's not sent to the connected peers
self.generate(self.nodes[0], nblocks=1)
# Give the node enough time to possibly leak out a message
time.sleep(PEER_TIMEOUT + 2)
# Make sure only expected messages came in
assert not no_version_idle_peer.unexpected_msg
assert not no_version_idle_peer.got_wtxidrelay
assert not no_version_idle_peer.got_sendaddrv2
assert not no_verack_idle_peer.unexpected_msg
assert no_verack_idle_peer.got_wtxidrelay
assert no_verack_idle_peer.got_sendaddrv2
assert not pre_wtxidrelay_peer.unexpected_msg
assert not pre_wtxidrelay_peer.got_wtxidrelay
assert not pre_wtxidrelay_peer.got_sendaddrv2
# Expect peers to be disconnected due to timeout
assert not no_version_idle_peer.is_connected
assert not no_verack_idle_peer.is_connected
assert not pre_wtxidrelay_peer.is_connected
self.log.info('Check that the version message does not leak the local address of the node')
p2p_version_store = self.nodes[0].add_p2p_connection(P2PVersionStore())
ver = p2p_version_store.version_received
# Check that received time is within one hour of now
assert_greater_than_or_equal(ver.nTime, time.time() - 3600)
assert_greater_than_or_equal(time.time() + 3600, ver.nTime)
assert_equal(ver.addrFrom.port, 0)
assert_equal(ver.addrFrom.ip, '0.0.0.0')
assert_equal(ver.nStartingHeight, 201)
assert_equal(ver.relay, 1)
self.log.info('Check that old peers are disconnected')
p2p_old_peer = self.nodes[0].add_p2p_connection(P2PInterface(), send_version=False, wait_for_verack=False)
with self.nodes[0].assert_debug_log(['peer=4 using obsolete version 31799; disconnecting']):
p2p_old_peer.send_message(self.create_old_version(31799))
p2p_old_peer.wait_for_disconnect()
if __name__ == '__main__':
P2PLeakTest().main()
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