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#!/usr/bin/env python3
# Copyright (c) 2015-2020 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 node responses to invalid blocks.
In this test we connect to one node over p2p, and test block requests:
1) Valid blocks should be requested and become chain tip.
2) Invalid block with duplicated transaction should be re-requested.
3) Invalid block with bad coinbase value should be rejected and not
re-requested.
"""
import copy
from test_framework.blocktools import create_block, create_coinbase, create_tx_with_script
from test_framework.messages import COIN
from test_framework.p2p import P2PDataStore
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import assert_equal
class InvalidBlockRequestTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
self.setup_clean_chain = True
self.extra_args = [["-whitelist=noban@127.0.0.1"]]
def run_test(self):
# Add p2p connection to node0
node = self.nodes[0] # convenience reference to the node
peer = node.add_p2p_connection(P2PDataStore())
best_block = node.getblock(node.getbestblockhash())
tip = int(node.getbestblockhash(), 16)
height = best_block["height"] + 1
block_time = best_block["time"] + 1
self.log.info("Create a new block with an anyone-can-spend coinbase")
height = 1
block = create_block(tip, create_coinbase(height), block_time, version=0x20000000)
block.solve()
# Save the coinbase for later
block1 = block
tip = block.sha256
peer.send_blocks_and_test([block1], node, success=True)
self.log.info("Mature the block.")
node.generatetoaddress(100, node.get_deterministic_priv_key().address)
best_block = node.getblock(node.getbestblockhash())
tip = int(node.getbestblockhash(), 16)
height = best_block["height"] + 1
block_time = best_block["time"] + 1
# Use merkle-root malleability to generate an invalid block with
# same blockheader (CVE-2012-2459).
# Manufacture a block with 3 transactions (coinbase, spend of prior
# coinbase, spend of that spend). Duplicate the 3rd transaction to
# leave merkle root and blockheader unchanged but invalidate the block.
# For more information on merkle-root malleability see src/consensus/merkle.cpp.
self.log.info("Test merkle root malleability.")
block2 = create_block(tip, create_coinbase(height), block_time, version=0x20000000)
block_time += 1
# b'0x51' is OP_TRUE
tx1 = create_tx_with_script(block1.vtx[0], 0, script_sig=b'\x51', amount=50 * COIN)
tx2 = create_tx_with_script(tx1, 0, script_sig=b'\x51', amount=50 * COIN)
block2.vtx.extend([tx1, tx2])
block2.hashMerkleRoot = block2.calc_merkle_root()
block2.rehash()
block2.solve()
orig_hash = block2.sha256
block2_orig = copy.deepcopy(block2)
# Mutate block 2
block2.vtx.append(tx2)
assert_equal(block2.hashMerkleRoot, block2.calc_merkle_root())
assert_equal(orig_hash, block2.rehash())
assert block2_orig.vtx != block2.vtx
peer.send_blocks_and_test([block2], node, success=False, reject_reason='bad-txns-duplicate')
# Check transactions for duplicate inputs (CVE-2018-17144)
self.log.info("Test duplicate input block.")
block2_dup = copy.deepcopy(block2_orig)
block2_dup.vtx[2].vin.append(block2_dup.vtx[2].vin[0])
block2_dup.vtx[2].rehash()
block2_dup.hashMerkleRoot = block2_dup.calc_merkle_root()
block2_dup.rehash()
block2_dup.solve()
peer.send_blocks_and_test([block2_dup], node, success=False, reject_reason='bad-txns-inputs-duplicate')
self.log.info("Test very broken block.")
block3 = create_block(tip, create_coinbase(height), block_time, version=0x20000000)
block_time += 1
block3.vtx[0].vout[0].nValue = 100 * COIN # Too high!
block3.vtx[0].sha256 = None
block3.vtx[0].calc_sha256()
block3.hashMerkleRoot = block3.calc_merkle_root()
block3.rehash()
block3.solve()
peer.send_blocks_and_test([block3], node, success=False, reject_reason='bad-cb-amount')
# Complete testing of CVE-2012-2459 by sending the original block.
# It should be accepted even though it has the same hash as the mutated one.
self.log.info("Test accepting original block after rejecting its mutated version.")
peer.send_blocks_and_test([block2_orig], node, success=True, timeout=5)
# Update tip info
height += 1
block_time += 1
tip = int(block2_orig.hash, 16)
# Complete testing of CVE-2018-17144, by checking for the inflation bug.
# Create a block that spends the output of a tx in a previous block.
block4 = create_block(tip, create_coinbase(height), block_time, version=0x20000000)
tx3 = create_tx_with_script(tx2, 0, script_sig=b'\x51', amount=50 * COIN)
# Duplicates input
tx3.vin.append(tx3.vin[0])
tx3.rehash()
block4.vtx.append(tx3)
block4.hashMerkleRoot = block4.calc_merkle_root()
block4.rehash()
block4.solve()
self.log.info("Test inflation by duplicating input")
peer.send_blocks_and_test([block4], node, success=False, reject_reason='bad-txns-inputs-duplicate')
if __name__ == '__main__':
InvalidBlockRequestTest().main()
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