#!/usr/bin/env python3 # Copyright (c) 2017-2020 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. A node should never send anything other than VERSION/VERACK until it's received a VERACK. 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_verack, msg_version, ) from test_framework.mininode import mininode_lock, P2PInterface from test_framework.test_framework import BitcoinTestFramework from test_framework.util import ( assert_equal, assert_greater_than_or_equal, wait_until, ) banscore = 10 class CLazyNode(P2PInterface): def __init__(self): super().__init__() self.unexpected_msg = False self.ever_connected = False def bad_message(self, message): self.unexpected_msg = True self.log.info("should not have received message: %s" % message.command) def on_open(self): self.ever_connected = True 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) # Node that never sends a version. We'll use this to send a bunch of messages # anyway, and eventually get disconnected. class CNodeNoVersionBan(CLazyNode): # send a bunch of veracks without sending a message. This should get us disconnected. # NOTE: implementation-specific check here. Remove if bitcoind ban behavior changes def on_open(self): super().on_open() for i in range(banscore): self.send_message(msg_verack()) # Node that never sends a version. This one just sits idle and hopes to receive # any message (it shouldn't!) class CNodeNoVersionIdle(CLazyNode): def __init__(self): super().__init__() # Node that sends a version but not a verack. class CNodeNoVerackIdle(CLazyNode): 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): super().on_version(msg) self.version_received = msg class P2PLeakTest(BitcoinTestFramework): def set_test_params(self): self.num_nodes = 1 self.extra_args = [['-banscore=' + str(banscore)]] def run_test(self): no_version_bannode = self.nodes[0].add_p2p_connection(CNodeNoVersionBan(), send_version=False, wait_for_verack=False) no_version_idlenode = self.nodes[0].add_p2p_connection(CNodeNoVersionIdle(), send_version=False, wait_for_verack=False) no_verack_idlenode = self.nodes[0].add_p2p_connection(CNodeNoVerackIdle(), wait_for_verack=False) # Wait until we got the verack in response to the version. Though, don't wait for the other node to receive the # verack, since we never sent one no_verack_idlenode.wait_for_verack() wait_until(lambda: no_version_bannode.ever_connected, timeout=10, lock=mininode_lock) wait_until(lambda: no_version_idlenode.ever_connected, timeout=10, lock=mininode_lock) wait_until(lambda: no_verack_idlenode.version_received, timeout=10, lock=mininode_lock) # Mine a block and make sure that it's not sent to the connected nodes self.nodes[0].generatetoaddress(1, self.nodes[0].get_deterministic_priv_key().address) #Give the node enough time to possibly leak out a message time.sleep(5) #This node should have been banned assert not no_version_bannode.is_connected self.nodes[0].disconnect_p2ps() # Wait until all connections are closed wait_until(lambda: len(self.nodes[0].getpeerinfo()) == 0) # Make sure no unexpected messages came in assert no_version_bannode.unexpected_msg == False assert no_version_idlenode.unexpected_msg == False assert no_verack_idlenode.unexpected_msg == False self.log.info('Check that the version message does not leak the local address of the node') time_begin = int(time.time()) p2p_version_store = self.nodes[0].add_p2p_connection(P2PVersionStore()) time_end = time.time() ver = p2p_version_store.version_received assert_greater_than_or_equal(ver.nTime, time_begin) assert_greater_than_or_equal(time_end, 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.nRelay, 1) self.log.info('Check that old nodes are disconnected') p2p_old_node = self.nodes[0].add_p2p_connection(P2PInterface(), send_version=False, wait_for_verack=False) old_version_msg = msg_version() old_version_msg.nVersion = 31799 wait_until(lambda: p2p_old_node.is_connected) with self.nodes[0].assert_debug_log(['peer=4 using obsolete version 31799; disconnecting']): p2p_old_node.send_message(old_version_msg) p2p_old_node.wait_for_disconnect() if __name__ == '__main__': P2PLeakTest().main()