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