#!/usr/bin/env python3 # Copyright (c) 2017 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/REJECT until it's received a VERACK. This test connects to a node and sends it a few messages, trying to intice it into sending us something it shouldn't. Also test that nodes that send unsupported service bits to bitcoind are disconnected and don't receive a VERACK. Unsupported service bits are currently 1 << 5 and 1 << 7 (until August 1st 2018).""" from test_framework.mininode import * from test_framework.test_framework import BitcoinTestFramework from test_framework.util import * banscore = 10 class CLazyNode(NodeConnCB): 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, conn): self.connected = True self.ever_connected = True def on_version(self, conn, message): self.bad_message(message) def on_verack(self, conn, message): self.bad_message(message) def on_reject(self, conn, message): self.bad_message(message) def on_inv(self, conn, message): self.bad_message(message) def on_addr(self, conn, message): self.bad_message(message) def on_alert(self, conn, message): self.bad_message(message) def on_getdata(self, conn, message): self.bad_message(message) def on_getblocks(self, conn, message): self.bad_message(message) def on_tx(self, conn, message): self.bad_message(message) def on_block(self, conn, message): self.bad_message(message) def on_getaddr(self, conn, message): self.bad_message(message) def on_headers(self, conn, message): self.bad_message(message) def on_getheaders(self, conn, message): self.bad_message(message) def on_ping(self, conn, message): self.bad_message(message) def on_mempool(self, conn): self.bad_message(message) def on_pong(self, conn, message): self.bad_message(message) def on_feefilter(self, conn, message): self.bad_message(message) def on_sendheaders(self, conn, message): self.bad_message(message) def on_sendcmpct(self, conn, message): self.bad_message(message) def on_cmpctblock(self, conn, message): self.bad_message(message) def on_getblocktxn(self, conn, message): self.bad_message(message) def on_blocktxn(self, conn, 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, conn): super().on_open(conn) for i in range(banscore): self.send_message(msg_verack()) def on_reject(self, conn, message): pass # 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_reject(self, conn, message): pass def on_verack(self, conn, 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, conn, message): self.version_received = True conn.send_message(msg_ping()) conn.send_message(msg_getaddr()) class P2PLeakTest(BitcoinTestFramework): def __init__(self): super().__init__() self.num_nodes = 1 self.extra_args = [['-banscore='+str(banscore)]] def run_test(self): no_version_bannode = CNodeNoVersionBan() no_version_idlenode = CNodeNoVersionIdle() no_verack_idlenode = CNodeNoVerackIdle() unsupported_service_bit5_node = CLazyNode() unsupported_service_bit7_node = CLazyNode() self.nodes[0].setmocktime(1501545600) # August 1st 2017 connections = [] connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], no_version_bannode, send_version=False)) connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], no_version_idlenode, send_version=False)) connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], no_verack_idlenode)) connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], unsupported_service_bit5_node, services=NODE_NETWORK|NODE_UNSUPPORTED_SERVICE_BIT_5)) connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], unsupported_service_bit7_node, services=NODE_NETWORK|NODE_UNSUPPORTED_SERVICE_BIT_7)) no_version_bannode.add_connection(connections[0]) no_version_idlenode.add_connection(connections[1]) no_verack_idlenode.add_connection(connections[2]) unsupported_service_bit5_node.add_connection(connections[3]) unsupported_service_bit7_node.add_connection(connections[4]) NetworkThread().start() # Start up network handling in another thread assert wait_until(lambda: no_version_bannode.ever_connected, timeout=10) assert wait_until(lambda: no_version_idlenode.ever_connected, timeout=10) assert wait_until(lambda: no_verack_idlenode.version_received, timeout=10) assert wait_until(lambda: unsupported_service_bit5_node.ever_connected, timeout=10) assert wait_until(lambda: unsupported_service_bit7_node.ever_connected, timeout=10) # Mine a block and make sure that it's not sent to the connected nodes self.nodes[0].generate(1) #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.connected # These nodes should have been disconnected assert not unsupported_service_bit5_node.connected assert not unsupported_service_bit7_node.connected [conn.disconnect_node() for conn in connections] # 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) assert not unsupported_service_bit5_node.unexpected_msg assert not unsupported_service_bit7_node.unexpected_msg self.log.info("Service bits 5 and 7 are allowed after August 1st 2018") self.nodes[0].setmocktime(1533168000) # August 2nd 2018 allowed_service_bit5_node = NodeConnCB() allowed_service_bit7_node = NodeConnCB() connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], allowed_service_bit5_node, services=NODE_NETWORK|NODE_UNSUPPORTED_SERVICE_BIT_5)) connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], allowed_service_bit7_node, services=NODE_NETWORK|NODE_UNSUPPORTED_SERVICE_BIT_7)) allowed_service_bit5_node.add_connection(connections[5]) allowed_service_bit7_node.add_connection(connections[6]) assert wait_until(lambda: allowed_service_bit5_node.message_count["verack"], timeout=10) assert wait_until(lambda: allowed_service_bit7_node.message_count["verack"], timeout=10) if __name__ == '__main__': P2PLeakTest().main()