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270 lines
11 KiB
270 lines
11 KiB
#!/usr/bin/env python3
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# Copyright (c) 2015-2020 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 node responses to invalid network messages."""
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import struct
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import time
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from test_framework.messages import (
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CBlockHeader,
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CInv,
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MAX_HEADERS_RESULTS,
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MAX_INV_SIZE,
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MAX_PROTOCOL_MESSAGE_LENGTH,
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msg_getdata,
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msg_headers,
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msg_inv,
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msg_ping,
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MSG_TX,
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ser_string,
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)
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from test_framework.p2p import (
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P2PDataStore,
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P2PInterface,
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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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hex_str_to_bytes,
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)
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VALID_DATA_LIMIT = MAX_PROTOCOL_MESSAGE_LENGTH - 5 # Account for the 5-byte length prefix
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class msg_unrecognized:
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"""Nonsensical message. Modeled after similar types in test_framework.messages."""
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msgtype = b'badmsg'
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def __init__(self, *, str_data):
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self.str_data = str_data.encode() if not isinstance(str_data, bytes) else str_data
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def serialize(self):
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return ser_string(self.str_data)
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def __repr__(self):
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return "{}(data={})".format(self.msgtype, self.str_data)
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class SenderOfAddrV2(P2PInterface):
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def wait_for_sendaddrv2(self):
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self.wait_until(lambda: 'sendaddrv2' in self.last_message)
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class InvalidMessagesTest(BitcoinTestFramework):
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def set_test_params(self):
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self.num_nodes = 1
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self.setup_clean_chain = True
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def run_test(self):
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self.test_buffer()
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self.test_magic_bytes()
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self.test_checksum()
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self.test_size()
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self.test_msgtype()
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self.test_addrv2_empty()
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self.test_addrv2_no_addresses()
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self.test_addrv2_too_long_address()
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self.test_addrv2_unrecognized_network()
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self.test_oversized_inv_msg()
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self.test_oversized_getdata_msg()
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self.test_oversized_headers_msg()
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self.test_resource_exhaustion()
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def test_buffer(self):
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self.log.info("Test message with header split across two buffers is received")
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conn = self.nodes[0].add_p2p_connection(P2PDataStore())
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# Create valid message
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msg = conn.build_message(msg_ping(nonce=12345))
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cut_pos = 12 # Chosen at an arbitrary position within the header
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# Send message in two pieces
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before = self.nodes[0].getnettotals()['totalbytesrecv']
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conn.send_raw_message(msg[:cut_pos])
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# Wait until node has processed the first half of the message
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self.wait_until(lambda: self.nodes[0].getnettotals()['totalbytesrecv'] != before)
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middle = self.nodes[0].getnettotals()['totalbytesrecv']
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# If this assert fails, we've hit an unlikely race
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# where the test framework sent a message in between the two halves
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assert_equal(middle, before + cut_pos)
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conn.send_raw_message(msg[cut_pos:])
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conn.sync_with_ping(timeout=1)
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self.nodes[0].disconnect_p2ps()
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def test_magic_bytes(self):
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self.log.info("Test message with invalid magic bytes disconnects peer")
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conn = self.nodes[0].add_p2p_connection(P2PDataStore())
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with self.nodes[0].assert_debug_log(['HEADER ERROR - MESSAGESTART (badmsg, 2 bytes), received ffffffff']):
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msg = conn.build_message(msg_unrecognized(str_data="d"))
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# modify magic bytes
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msg = b'\xff' * 4 + msg[4:]
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conn.send_raw_message(msg)
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conn.wait_for_disconnect(timeout=1)
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self.nodes[0].disconnect_p2ps()
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def test_checksum(self):
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self.log.info("Test message with invalid checksum logs an error")
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conn = self.nodes[0].add_p2p_connection(P2PDataStore())
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with self.nodes[0].assert_debug_log(['CHECKSUM ERROR (badmsg, 2 bytes), expected 78df0a04 was ffffffff']):
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msg = conn.build_message(msg_unrecognized(str_data="d"))
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# Checksum is after start bytes (4B), message type (12B), len (4B)
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cut_len = 4 + 12 + 4
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# modify checksum
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msg = msg[:cut_len] + b'\xff' * 4 + msg[cut_len + 4:]
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conn.send_raw_message(msg)
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conn.sync_with_ping(timeout=1)
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# Check that traffic is accounted for (24 bytes header + 2 bytes payload)
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assert_equal(self.nodes[0].getpeerinfo()[0]['bytesrecv_per_msg']['*other*'], 26)
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self.nodes[0].disconnect_p2ps()
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def test_size(self):
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self.log.info("Test message with oversized payload disconnects peer")
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conn = self.nodes[0].add_p2p_connection(P2PDataStore())
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with self.nodes[0].assert_debug_log(['HEADER ERROR - SIZE (badmsg, 4000001 bytes)']):
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msg = msg_unrecognized(str_data="d" * (VALID_DATA_LIMIT + 1))
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msg = conn.build_message(msg)
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conn.send_raw_message(msg)
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conn.wait_for_disconnect(timeout=1)
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self.nodes[0].disconnect_p2ps()
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def test_msgtype(self):
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self.log.info("Test message with invalid message type logs an error")
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conn = self.nodes[0].add_p2p_connection(P2PDataStore())
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with self.nodes[0].assert_debug_log(['HEADER ERROR - COMMAND']):
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msg = msg_unrecognized(str_data="d")
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msg = conn.build_message(msg)
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# Modify msgtype
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msg = msg[:7] + b'\x00' + msg[7 + 1:]
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conn.send_raw_message(msg)
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conn.sync_with_ping(timeout=1)
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# Check that traffic is accounted for (24 bytes header + 2 bytes payload)
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assert_equal(self.nodes[0].getpeerinfo()[0]['bytesrecv_per_msg']['*other*'], 26)
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self.nodes[0].disconnect_p2ps()
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def test_addrv2(self, label, required_log_messages, raw_addrv2):
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node = self.nodes[0]
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conn = node.add_p2p_connection(SenderOfAddrV2())
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# Make sure bitcoind signals support for ADDRv2, otherwise this test
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# will bombard an old node with messages it does not recognize which
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# will produce unexpected results.
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conn.wait_for_sendaddrv2()
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self.log.info('Test addrv2: ' + label)
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msg = msg_unrecognized(str_data=b'')
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msg.msgtype = b'addrv2'
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with node.assert_debug_log(required_log_messages):
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# override serialize() which would include the length of the data
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msg.serialize = lambda: raw_addrv2
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conn.send_raw_message(conn.build_message(msg))
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conn.sync_with_ping()
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node.disconnect_p2ps()
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def test_addrv2_empty(self):
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self.test_addrv2('empty',
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[
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'received: addrv2 (0 bytes)',
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'ProcessMessages(addrv2, 0 bytes): Exception',
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'end of data',
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],
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b'')
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def test_addrv2_no_addresses(self):
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self.test_addrv2('no addresses',
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[
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'received: addrv2 (1 bytes)',
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],
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hex_str_to_bytes('00'))
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def test_addrv2_too_long_address(self):
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self.test_addrv2('too long address',
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[
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'received: addrv2 (525 bytes)',
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'ProcessMessages(addrv2, 525 bytes): Exception',
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'Address too long: 513 > 512',
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],
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hex_str_to_bytes(
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'01' + # number of entries
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'61bc6649' + # time, Fri Jan 9 02:54:25 UTC 2009
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'00' + # service flags, COMPACTSIZE(NODE_NONE)
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'01' + # network type (IPv4)
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'fd0102' + # address length (COMPACTSIZE(513))
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'ab' * 513 + # address
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'208d')) # port
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def test_addrv2_unrecognized_network(self):
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now_hex = struct.pack('<I', int(time.time())).hex()
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self.test_addrv2('unrecognized network',
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[
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'received: addrv2 (25 bytes)',
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'IP 9.9.9.9 mapped',
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'Added 1 addresses',
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],
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hex_str_to_bytes(
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'02' + # number of entries
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# this should be ignored without impeding acceptance of subsequent ones
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now_hex + # time
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'01' + # service flags, COMPACTSIZE(NODE_NETWORK)
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'99' + # network type (unrecognized)
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'02' + # address length (COMPACTSIZE(2))
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'ab' * 2 + # address
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'208d' + # port
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# this should be added:
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now_hex + # time
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'01' + # service flags, COMPACTSIZE(NODE_NETWORK)
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'01' + # network type (IPv4)
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'04' + # address length (COMPACTSIZE(4))
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'09' * 4 + # address
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'208d')) # port
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def test_oversized_msg(self, msg, size):
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msg_type = msg.msgtype.decode('ascii')
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self.log.info("Test {} message of size {} is logged as misbehaving".format(msg_type, size))
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with self.nodes[0].assert_debug_log(['Misbehaving', '{} message size = {}'.format(msg_type, size)]):
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self.nodes[0].add_p2p_connection(P2PInterface()).send_and_ping(msg)
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self.nodes[0].disconnect_p2ps()
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def test_oversized_inv_msg(self):
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size = MAX_INV_SIZE + 1
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self.test_oversized_msg(msg_inv([CInv(MSG_TX, 1)] * size), size)
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def test_oversized_getdata_msg(self):
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size = MAX_INV_SIZE + 1
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self.test_oversized_msg(msg_getdata([CInv(MSG_TX, 1)] * size), size)
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def test_oversized_headers_msg(self):
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size = MAX_HEADERS_RESULTS + 1
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self.test_oversized_msg(msg_headers([CBlockHeader()] * size), size)
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def test_resource_exhaustion(self):
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self.log.info("Test node stays up despite many large junk messages")
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conn = self.nodes[0].add_p2p_connection(P2PDataStore())
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conn2 = self.nodes[0].add_p2p_connection(P2PDataStore())
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msg_at_size = msg_unrecognized(str_data="b" * VALID_DATA_LIMIT)
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assert len(msg_at_size.serialize()) == MAX_PROTOCOL_MESSAGE_LENGTH
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self.log.info("(a) Send 80 messages, each of maximum valid data size (4MB)")
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for _ in range(80):
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conn.send_message(msg_at_size)
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# Check that, even though the node is being hammered by nonsense from one
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# connection, it can still service other peers in a timely way.
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self.log.info("(b) Check node still services peers in a timely way")
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for _ in range(20):
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conn2.sync_with_ping(timeout=2)
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self.log.info("(c) Wait for node to drop junk messages, while remaining connected")
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conn.sync_with_ping(timeout=400)
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# Despite being served up a bunch of nonsense, the peers should still be connected.
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assert conn.is_connected
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assert conn2.is_connected
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self.nodes[0].disconnect_p2ps()
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if __name__ == '__main__':
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InvalidMessagesTest().main()
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