1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
#!/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 various fingerprinting protections.
If a stale block more than a month old or its header are requested by a peer,
the node should pretend that it does not have it to avoid fingerprinting.
"""
import time
from test_framework.blocktools import (create_block, create_coinbase)
from test_framework.messages import CInv, MSG_BLOCK
from test_framework.p2p import (
P2PInterface,
msg_headers,
msg_block,
msg_getdata,
msg_getheaders,
p2p_lock,
)
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
)
class P2PFingerprintTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 1
# Build a chain of blocks on top of given one
def build_chain(self, nblocks, prev_hash, prev_height, prev_median_time):
blocks = []
for _ in range(nblocks):
coinbase = create_coinbase(prev_height + 1)
block_time = prev_median_time + 1
block = create_block(int(prev_hash, 16), coinbase, block_time)
block.solve()
blocks.append(block)
prev_hash = block.hash
prev_height += 1
prev_median_time = block_time
return blocks
# Send a getdata request for a given block hash
def send_block_request(self, block_hash, node):
msg = msg_getdata()
msg.inv.append(CInv(MSG_BLOCK, block_hash))
node.send_message(msg)
# Send a getheaders request for a given single block hash
def send_header_request(self, block_hash, node):
msg = msg_getheaders()
msg.hashstop = block_hash
node.send_message(msg)
# Checks that stale blocks timestamped more than a month ago are not served
# by the node while recent stale blocks and old active chain blocks are.
# This does not currently test that stale blocks timestamped within the
# last month but that have over a month's worth of work are also withheld.
def run_test(self):
node0 = self.nodes[0].add_p2p_connection(P2PInterface())
# Set node time to 60 days ago
self.nodes[0].setmocktime(int(time.time()) - 60 * 24 * 60 * 60)
# Generating a chain of 10 blocks
block_hashes = self.generatetoaddress(self.nodes[0], 10, self.nodes[0].get_deterministic_priv_key().address)
# Create longer chain starting 2 blocks before current tip
height = len(block_hashes) - 2
block_hash = block_hashes[height - 1]
block_time = self.nodes[0].getblockheader(block_hash)["mediantime"] + 1
new_blocks = self.build_chain(5, block_hash, height, block_time)
# Force reorg to a longer chain
node0.send_message(msg_headers(new_blocks))
node0.wait_for_getdata([x.sha256 for x in new_blocks])
for block in new_blocks:
node0.send_and_ping(msg_block(block))
# Check that reorg succeeded
assert_equal(self.nodes[0].getblockcount(), 13)
stale_hash = int(block_hashes[-1], 16)
# Check that getdata request for stale block succeeds
self.send_block_request(stale_hash, node0)
node0.wait_for_block(stale_hash, timeout=3)
# Check that getheader request for stale block header succeeds
self.send_header_request(stale_hash, node0)
node0.wait_for_header(hex(stale_hash), timeout=3)
# Longest chain is extended so stale is much older than chain tip
self.nodes[0].setmocktime(0)
block_hash = int(self.generatetoaddress(self.nodes[0], 1, self.nodes[0].get_deterministic_priv_key().address)[-1], 16)
assert_equal(self.nodes[0].getblockcount(), 14)
node0.wait_for_block(block_hash, timeout=3)
# Request for very old stale block should now fail
with p2p_lock:
node0.last_message.pop("block", None)
self.send_block_request(stale_hash, node0)
node0.sync_with_ping()
assert "block" not in node0.last_message
# Request for very old stale block header should now fail
with p2p_lock:
node0.last_message.pop("headers", None)
self.send_header_request(stale_hash, node0)
node0.sync_with_ping()
assert "headers" not in node0.last_message
# Verify we can fetch very old blocks and headers on the active chain
block_hash = int(block_hashes[2], 16)
self.send_block_request(block_hash, node0)
self.send_header_request(block_hash, node0)
node0.sync_with_ping()
self.send_block_request(block_hash, node0)
node0.wait_for_block(block_hash, timeout=3)
self.send_header_request(block_hash, node0)
node0.wait_for_header(hex(block_hash), timeout=3)
if __name__ == '__main__':
P2PFingerprintTest(__file__).main()
|
