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134 lines
4.9 KiB
134 lines
4.9 KiB
#!/usr/bin/env python3
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# Copyright (c) 2017-2020 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 various fingerprinting protections.
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If a stale block more than a month old or its header are requested by a peer,
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the node should pretend that it does not have it to avoid fingerprinting.
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"""
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import time
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from test_framework.blocktools import (create_block, create_coinbase)
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from test_framework.messages import CInv, MSG_BLOCK
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from test_framework.p2p import (
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P2PInterface,
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msg_headers,
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msg_block,
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msg_getdata,
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msg_getheaders,
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p2p_lock,
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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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)
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class P2PFingerprintTest(BitcoinTestFramework):
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def set_test_params(self):
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self.setup_clean_chain = True
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self.num_nodes = 1
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# Build a chain of blocks on top of given one
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def build_chain(self, nblocks, prev_hash, prev_height, prev_median_time):
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blocks = []
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for _ in range(nblocks):
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coinbase = create_coinbase(prev_height + 1)
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block_time = prev_median_time + 1
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block = create_block(int(prev_hash, 16), coinbase, block_time)
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block.solve()
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blocks.append(block)
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prev_hash = block.hash
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prev_height += 1
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prev_median_time = block_time
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return blocks
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# Send a getdata request for a given block hash
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def send_block_request(self, block_hash, node):
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msg = msg_getdata()
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msg.inv.append(CInv(MSG_BLOCK, block_hash))
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node.send_message(msg)
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# Send a getheaders request for a given single block hash
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def send_header_request(self, block_hash, node):
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msg = msg_getheaders()
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msg.hashstop = block_hash
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node.send_message(msg)
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# Checks that stale blocks timestamped more than a month ago are not served
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# by the node while recent stale blocks and old active chain blocks are.
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# This does not currently test that stale blocks timestamped within the
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# last month but that have over a month's worth of work are also withheld.
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def run_test(self):
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node0 = self.nodes[0].add_p2p_connection(P2PInterface())
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# Set node time to 60 days ago
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self.nodes[0].setmocktime(int(time.time()) - 60 * 24 * 60 * 60)
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# Generating a chain of 10 blocks
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block_hashes = self.nodes[0].generatetoaddress(10, self.nodes[0].get_deterministic_priv_key().address)
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# Create longer chain starting 2 blocks before current tip
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height = len(block_hashes) - 2
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block_hash = block_hashes[height - 1]
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block_time = self.nodes[0].getblockheader(block_hash)["mediantime"] + 1
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new_blocks = self.build_chain(5, block_hash, height, block_time)
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# Force reorg to a longer chain
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node0.send_message(msg_headers(new_blocks))
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node0.wait_for_getdata([x.sha256 for x in new_blocks])
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for block in new_blocks:
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node0.send_and_ping(msg_block(block))
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# Check that reorg succeeded
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assert_equal(self.nodes[0].getblockcount(), 13)
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stale_hash = int(block_hashes[-1], 16)
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# Check that getdata request for stale block succeeds
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self.send_block_request(stale_hash, node0)
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node0.wait_for_block(stale_hash, timeout=3)
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# Check that getheader request for stale block header succeeds
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self.send_header_request(stale_hash, node0)
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node0.wait_for_header(hex(stale_hash), timeout=3)
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# Longest chain is extended so stale is much older than chain tip
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self.nodes[0].setmocktime(0)
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block_hash = int(self.nodes[0].generatetoaddress(1, self.nodes[0].get_deterministic_priv_key().address)[-1], 16)
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assert_equal(self.nodes[0].getblockcount(), 14)
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node0.wait_for_block(block_hash, timeout=3)
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# Request for very old stale block should now fail
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with p2p_lock:
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node0.last_message.pop("block", None)
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self.send_block_request(stale_hash, node0)
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node0.sync_with_ping()
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assert "block" not in node0.last_message
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# Request for very old stale block header should now fail
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with p2p_lock:
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node0.last_message.pop("headers", None)
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self.send_header_request(stale_hash, node0)
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node0.sync_with_ping()
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assert "headers" not in node0.last_message
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# Verify we can fetch very old blocks and headers on the active chain
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block_hash = int(block_hashes[2], 16)
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self.send_block_request(block_hash, node0)
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self.send_header_request(block_hash, node0)
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node0.sync_with_ping()
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self.send_block_request(block_hash, node0)
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node0.wait_for_block(block_hash, timeout=3)
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self.send_header_request(block_hash, node0)
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node0.wait_for_header(hex(block_hash), timeout=3)
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if __name__ == '__main__':
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P2PFingerprintTest().main()
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