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-rwxr-xr-xtest/functional/p2p_fingerprint.py152
1 files changed, 152 insertions, 0 deletions
diff --git a/test/functional/p2p_fingerprint.py b/test/functional/p2p_fingerprint.py
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+++ b/test/functional/p2p_fingerprint.py
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+#!/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 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.mininode import (
+ CInv,
+ P2PInterface,
+ msg_headers,
+ msg_block,
+ msg_getdata,
+ msg_getheaders,
+ network_thread_start,
+ wait_until,
+)
+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(2, block_hash)) # 2 == "Block"
+ 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)
+
+ # Check whether last block received from node has a given hash
+ def last_block_equals(self, expected_hash, node):
+ block_msg = node.last_message.get("block")
+ return block_msg and block_msg.block.rehash() == expected_hash
+
+ # Check whether last block header received from node has a given hash
+ def last_header_equals(self, expected_hash, node):
+ headers_msg = node.last_message.get("headers")
+ return (headers_msg and
+ headers_msg.headers and
+ headers_msg.headers[0].rehash() == expected_hash)
+
+ # 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())
+
+ network_thread_start()
+ node0.wait_for_verack()
+
+ # 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.nodes[0].generate(nblocks=10)
+
+ # 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()
+ 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)
+ test_function = lambda: self.last_block_equals(stale_hash, node0)
+ wait_until(test_function, timeout=3)
+
+ # Check that getheader request for stale block header succeeds
+ self.send_header_request(stale_hash, node0)
+ test_function = lambda: self.last_header_equals(stale_hash, node0)
+ wait_until(test_function, timeout=3)
+
+ # Longest chain is extended so stale is much older than chain tip
+ self.nodes[0].setmocktime(0)
+ tip = self.nodes[0].generate(nblocks=1)[0]
+ assert_equal(self.nodes[0].getblockcount(), 14)
+
+ # Send getdata & getheaders to refresh last received getheader message
+ block_hash = int(tip, 16)
+ self.send_block_request(block_hash, node0)
+ self.send_header_request(block_hash, node0)
+ node0.sync_with_ping()
+
+ # Request for very old stale block should now fail
+ self.send_block_request(stale_hash, node0)
+ time.sleep(3)
+ assert not self.last_block_equals(stale_hash, node0)
+
+ # Request for very old stale block header should now fail
+ self.send_header_request(stale_hash, node0)
+ time.sleep(3)
+ assert not self.last_header_equals(stale_hash, node0)
+
+ # 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)
+ test_function = lambda: self.last_block_equals(block_hash, node0)
+ wait_until(test_function, timeout=3)
+
+ self.send_header_request(block_hash, node0)
+ test_function = lambda: self.last_header_equals(block_hash, node0)
+ wait_until(test_function, timeout=3)
+
+if __name__ == '__main__':
+ P2PFingerprintTest().main()