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157 lines
6.3 KiB
157 lines
6.3 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 blocks.
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In this test we connect to one node over p2p, and test block requests:
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1) Valid blocks should be requested and become chain tip.
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2) Invalid block with duplicated transaction should be re-requested.
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3) Invalid block with bad coinbase value should be rejected and not
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re-requested.
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4) Invalid block due to future timestamp is later accepted when that timestamp
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becomes valid.
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"""
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import copy
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import time
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from test_framework.blocktools import create_block, create_coinbase, create_tx_with_script
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from test_framework.messages import COIN
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from test_framework.p2p import P2PDataStore
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import assert_equal
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MAX_FUTURE_BLOCK_TIME = 2 * 60 * 60
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class InvalidBlockRequestTest(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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self.extra_args = [["-whitelist=noban@127.0.0.1"]]
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def run_test(self):
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# Add p2p connection to node0
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node = self.nodes[0] # convenience reference to the node
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peer = node.add_p2p_connection(P2PDataStore())
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best_block = node.getblock(node.getbestblockhash())
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tip = int(node.getbestblockhash(), 16)
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height = best_block["height"] + 1
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block_time = best_block["time"] + 1
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self.log.info("Create a new block with an anyone-can-spend coinbase")
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height = 1
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block = create_block(tip, create_coinbase(height), block_time)
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block.solve()
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# Save the coinbase for later
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block1 = block
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tip = block.sha256
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peer.send_blocks_and_test([block1], node, success=True)
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self.log.info("Mature the block.")
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node.generatetoaddress(100, node.get_deterministic_priv_key().address)
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best_block = node.getblock(node.getbestblockhash())
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tip = int(node.getbestblockhash(), 16)
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height = best_block["height"] + 1
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block_time = best_block["time"] + 1
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# Use merkle-root malleability to generate an invalid block with
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# same blockheader (CVE-2012-2459).
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# Manufacture a block with 3 transactions (coinbase, spend of prior
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# coinbase, spend of that spend). Duplicate the 3rd transaction to
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# leave merkle root and blockheader unchanged but invalidate the block.
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# For more information on merkle-root malleability see src/consensus/merkle.cpp.
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self.log.info("Test merkle root malleability.")
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block2 = create_block(tip, create_coinbase(height), block_time)
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block_time += 1
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# b'0x51' is OP_TRUE
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tx1 = create_tx_with_script(block1.vtx[0], 0, script_sig=b'\x51', amount=50 * COIN)
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tx2 = create_tx_with_script(tx1, 0, script_sig=b'\x51', amount=50 * COIN)
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block2.vtx.extend([tx1, tx2])
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block2.hashMerkleRoot = block2.calc_merkle_root()
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block2.rehash()
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block2.solve()
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orig_hash = block2.sha256
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block2_orig = copy.deepcopy(block2)
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# Mutate block 2
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block2.vtx.append(tx2)
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assert_equal(block2.hashMerkleRoot, block2.calc_merkle_root())
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assert_equal(orig_hash, block2.rehash())
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assert block2_orig.vtx != block2.vtx
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peer.send_blocks_and_test([block2], node, success=False, reject_reason='bad-txns-duplicate')
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# Check transactions for duplicate inputs (CVE-2018-17144)
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self.log.info("Test duplicate input block.")
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block2_dup = copy.deepcopy(block2_orig)
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block2_dup.vtx[2].vin.append(block2_dup.vtx[2].vin[0])
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block2_dup.vtx[2].rehash()
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block2_dup.hashMerkleRoot = block2_dup.calc_merkle_root()
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block2_dup.rehash()
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block2_dup.solve()
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peer.send_blocks_and_test([block2_dup], node, success=False, reject_reason='bad-txns-inputs-duplicate')
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self.log.info("Test very broken block.")
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block3 = create_block(tip, create_coinbase(height), block_time)
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block_time += 1
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block3.vtx[0].vout[0].nValue = 100 * COIN # Too high!
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block3.vtx[0].sha256 = None
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block3.vtx[0].calc_sha256()
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block3.hashMerkleRoot = block3.calc_merkle_root()
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block3.rehash()
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block3.solve()
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peer.send_blocks_and_test([block3], node, success=False, reject_reason='bad-cb-amount')
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# Complete testing of CVE-2012-2459 by sending the original block.
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# It should be accepted even though it has the same hash as the mutated one.
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self.log.info("Test accepting original block after rejecting its mutated version.")
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peer.send_blocks_and_test([block2_orig], node, success=True, timeout=5)
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# Update tip info
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height += 1
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block_time += 1
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tip = int(block2_orig.hash, 16)
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# Complete testing of CVE-2018-17144, by checking for the inflation bug.
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# Create a block that spends the output of a tx in a previous block.
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block4 = create_block(tip, create_coinbase(height), block_time)
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tx3 = create_tx_with_script(tx2, 0, script_sig=b'\x51', amount=50 * COIN)
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# Duplicates input
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tx3.vin.append(tx3.vin[0])
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tx3.rehash()
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block4.vtx.append(tx3)
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block4.hashMerkleRoot = block4.calc_merkle_root()
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block4.rehash()
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block4.solve()
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self.log.info("Test inflation by duplicating input")
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peer.send_blocks_and_test([block4], node, success=False, reject_reason='bad-txns-inputs-duplicate')
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self.log.info("Test accepting identical block after rejecting it due to a future timestamp.")
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t = int(time.time())
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node.setmocktime(t)
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# Set block time +1 second past max future validity
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block = create_block(tip, create_coinbase(height), t + MAX_FUTURE_BLOCK_TIME + 1)
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block.hashMerkleRoot = block.calc_merkle_root()
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block.solve()
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# Need force_send because the block will get rejected without a getdata otherwise
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peer.send_blocks_and_test([block], node, force_send=True, success=False, reject_reason='time-too-new')
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node.setmocktime(t + 1)
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peer.send_blocks_and_test([block], node, success=True)
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if __name__ == '__main__':
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InvalidBlockRequestTest().main()
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