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On testnet4 with the timewarp mitigation active, when pool software ignores the curtime and mintime fields provided by the getblocktemplate RPC or by createNewBlock() in the Mining interface, they are vulnerable to a griefing attack. The test is expanded to illustrate this.
458 lines
22 KiB
Python
Executable file
458 lines
22 KiB
Python
Executable file
#!/usr/bin/env python3
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# Copyright (c) 2014-2022 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 mining RPCs
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- getmininginfo
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- getblocktemplate proposal mode
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- submitblock"""
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import copy
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from decimal import Decimal
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from test_framework.blocktools import (
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create_coinbase,
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get_witness_script,
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NORMAL_GBT_REQUEST_PARAMS,
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TIME_GENESIS_BLOCK,
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REGTEST_N_BITS,
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REGTEST_TARGET,
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nbits_str,
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target_str,
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)
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from test_framework.messages import (
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BLOCK_HEADER_SIZE,
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CBlock,
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CBlockHeader,
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COIN,
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ser_uint256,
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)
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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 (
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assert_equal,
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assert_greater_than,
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assert_greater_than_or_equal,
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assert_raises_rpc_error,
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get_fee,
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)
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from test_framework.wallet import MiniWallet
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DIFFICULTY_ADJUSTMENT_INTERVAL = 144
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MAX_FUTURE_BLOCK_TIME = 2 * 3600
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MAX_TIMEWARP = 600
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VERSIONBITS_TOP_BITS = 0x20000000
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VERSIONBITS_DEPLOYMENT_TESTDUMMY_BIT = 28
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DEFAULT_BLOCK_MIN_TX_FEE = 1000 # default `-blockmintxfee` setting [sat/kvB]
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def assert_template(node, block, expect, rehash=True):
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if rehash:
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block.hashMerkleRoot = block.calc_merkle_root()
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rsp = node.getblocktemplate(template_request={
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'data': block.serialize().hex(),
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'mode': 'proposal',
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'rules': ['segwit'],
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})
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assert_equal(rsp, expect)
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class MiningTest(BitcoinTestFramework):
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def set_test_params(self):
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self.num_nodes = 3
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self.extra_args = [
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[],
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[],
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["-fastprune", "-prune=1"]
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]
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self.setup_clean_chain = True
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self.supports_cli = False
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def mine_chain(self):
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self.log.info('Create some old blocks')
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for t in range(TIME_GENESIS_BLOCK, TIME_GENESIS_BLOCK + 200 * 600, 600):
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self.nodes[0].setmocktime(t)
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self.generate(self.wallet, 1, sync_fun=self.no_op)
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mining_info = self.nodes[0].getmininginfo()
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assert_equal(mining_info['blocks'], 200)
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assert_equal(mining_info['currentblocktx'], 0)
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assert_equal(mining_info['currentblockweight'], 4000)
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self.log.info('test blockversion')
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self.restart_node(0, extra_args=[f'-mocktime={t}', '-blockversion=1337'])
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self.connect_nodes(0, 1)
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assert_equal(1337, self.nodes[0].getblocktemplate(NORMAL_GBT_REQUEST_PARAMS)['version'])
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self.restart_node(0, extra_args=[f'-mocktime={t}'])
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self.connect_nodes(0, 1)
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assert_equal(VERSIONBITS_TOP_BITS + (1 << VERSIONBITS_DEPLOYMENT_TESTDUMMY_BIT), self.nodes[0].getblocktemplate(NORMAL_GBT_REQUEST_PARAMS)['version'])
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self.restart_node(0)
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self.connect_nodes(0, 1)
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def test_blockmintxfee_parameter(self):
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self.log.info("Test -blockmintxfee setting")
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self.restart_node(0, extra_args=['-minrelaytxfee=0', '-persistmempool=0'])
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node = self.nodes[0]
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# test default (no parameter), zero and a bunch of arbitrary blockmintxfee rates [sat/kvB]
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for blockmintxfee_sat_kvb in (DEFAULT_BLOCK_MIN_TX_FEE, 0, 50, 100, 500, 2500, 5000, 21000, 333333, 2500000):
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blockmintxfee_btc_kvb = blockmintxfee_sat_kvb / Decimal(COIN)
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if blockmintxfee_sat_kvb == DEFAULT_BLOCK_MIN_TX_FEE:
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self.log.info(f"-> Default -blockmintxfee setting ({blockmintxfee_sat_kvb} sat/kvB)...")
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else:
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blockmintxfee_parameter = f"-blockmintxfee={blockmintxfee_btc_kvb:.8f}"
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self.log.info(f"-> Test {blockmintxfee_parameter} ({blockmintxfee_sat_kvb} sat/kvB)...")
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self.restart_node(0, extra_args=[blockmintxfee_parameter, '-minrelaytxfee=0', '-persistmempool=0'])
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self.wallet.rescan_utxos() # to avoid spending outputs of txs that are not in mempool anymore after restart
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# submit one tx with exactly the blockmintxfee rate, and one slightly below
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tx_with_min_feerate = self.wallet.send_self_transfer(from_node=node, fee_rate=blockmintxfee_btc_kvb)
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assert_equal(tx_with_min_feerate["fee"], get_fee(tx_with_min_feerate["tx"].get_vsize(), blockmintxfee_btc_kvb))
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if blockmintxfee_btc_kvb > 0:
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lowerfee_btc_kvb = blockmintxfee_btc_kvb - Decimal(10)/COIN # 0.01 sat/vbyte lower
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tx_below_min_feerate = self.wallet.send_self_transfer(from_node=node, fee_rate=lowerfee_btc_kvb)
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assert_equal(tx_below_min_feerate["fee"], get_fee(tx_below_min_feerate["tx"].get_vsize(), lowerfee_btc_kvb))
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else: # go below zero fee by using modified fees
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tx_below_min_feerate = self.wallet.send_self_transfer(from_node=node, fee_rate=blockmintxfee_btc_kvb)
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node.prioritisetransaction(tx_below_min_feerate["txid"], 0, -1)
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# check that tx below specified fee-rate is neither in template nor in the actual block
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block_template = node.getblocktemplate(NORMAL_GBT_REQUEST_PARAMS)
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block_template_txids = [tx['txid'] for tx in block_template['transactions']]
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self.generate(self.wallet, 1, sync_fun=self.no_op)
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block = node.getblock(node.getbestblockhash(), verbosity=2)
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block_txids = [tx['txid'] for tx in block['tx']]
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assert tx_with_min_feerate['txid'] in block_template_txids
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assert tx_with_min_feerate['txid'] in block_txids
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assert tx_below_min_feerate['txid'] not in block_template_txids
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assert tx_below_min_feerate['txid'] not in block_txids
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def test_timewarp(self):
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self.log.info("Test timewarp attack mitigation (BIP94)")
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node = self.nodes[0]
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self.restart_node(0, extra_args=['-test=bip94'])
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self.log.info("Mine until the last block of the retarget period")
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blockchain_info = self.nodes[0].getblockchaininfo()
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n = DIFFICULTY_ADJUSTMENT_INTERVAL - blockchain_info['blocks'] % DIFFICULTY_ADJUSTMENT_INTERVAL - 2
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wall_time = blockchain_info['time']
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for _ in range(n):
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wall_time += 600
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node.setmocktime(wall_time)
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self.generate(self.wallet, 1, sync_fun=self.no_op)
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self.log.info("Create block MAX_TIMEWARP < t <= MAX_FUTURE_BLOCK_TIME in the future")
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# A timestamp that's more than MAX_TIMEWARP seconds in the future can
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# happen by accident, due to a combination of pool software that doesn't
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# use "curtime" AND has a faulty clock.
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#
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# But it could also be intentional, at the end of a retarget period, in
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# order to make the next block miner violate the time-timewarp-attack rule.
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# For this attack to succeed the victim miner needs to ignore both our
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# "curtime" and "mintime" values AND use wall clock time. This is true even
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# if the victim miner implements the MTP rule.
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#
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# The attack is illustrated below.
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#
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# The attacker produces a block with a timestamp in the future:
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future = wall_time + 1000
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# This is an arbitrary time, far enough in the future that it triggers the
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# timewarp rule, but not so far in the future that it won't get relayed.
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assert_greater_than(future, wall_time + MAX_TIMEWARP)
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assert_greater_than_or_equal(wall_time + MAX_FUTURE_BLOCK_TIME, future)
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node.setmocktime(future)
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self.generate(self.wallet, 1, sync_fun=self.no_op)
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assert_equal(node.getblock(node.getbestblockhash())['time'], future)
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self.log.info("First block template of retarget period can't use wall clock time")
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node.setmocktime(wall_time)
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# The template will have an adjusted timestamp.
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tmpl = node.getblocktemplate(NORMAL_GBT_REQUEST_PARAMS)
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assert_equal(tmpl['curtime'], future - MAX_TIMEWARP)
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# mintime and curtime should match
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assert_equal(tmpl['mintime'], tmpl['curtime'])
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# Check that the adjusted timestamp results in a valid block
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block = CBlock()
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block.nVersion = tmpl["version"]
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block.hashPrevBlock = int(tmpl["previousblockhash"], 16)
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block.nTime = tmpl["curtime"]
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block.nBits = int(tmpl["bits"], 16)
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block.nNonce = 0
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block.vtx = [create_coinbase(height=int(tmpl["height"]))]
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block.solve()
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assert_template(node, block, None)
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# Use wall clock instead of the adjusted timestamp. This could happen
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# by accident if pool software ignores mintime and curtime.
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bad_block = copy.deepcopy(block)
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bad_block.nTime = wall_time
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bad_block.solve()
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assert_raises_rpc_error(-25, 'time-timewarp-attack', lambda: node.submitheader(hexdata=CBlockHeader(bad_block).serialize().hex()))
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# It can also happen if the pool implements its own logic to adjust its
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# timestamp to MTP + 1, but doesn't take the new timewarp rule into
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# account (and ignores mintime).
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mtp = node.getblock(node.getbestblockhash())["mediantime"]
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bad_block.nTime = mtp + 1
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bad_block.solve()
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assert_raises_rpc_error(-25, 'time-timewarp-attack', lambda: node.submitheader(hexdata=CBlockHeader(bad_block).serialize().hex()))
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self.log.info("Test timewarp protection boundary")
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bad_block.nTime = future - MAX_TIMEWARP - 1
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bad_block.solve()
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assert_raises_rpc_error(-25, 'time-timewarp-attack', lambda: node.submitheader(hexdata=CBlockHeader(bad_block).serialize().hex()))
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block.nTime = future - MAX_TIMEWARP
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block.solve()
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node.submitheader(hexdata=CBlockHeader(block).serialize().hex())
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def test_pruning(self):
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self.log.info("Test that submitblock stores previously pruned block")
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prune_node = self.nodes[2]
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self.generate(prune_node, 400, sync_fun=self.no_op)
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pruned_block = prune_node.getblock(prune_node.getblockhash(2), verbosity=0)
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pruned_height = prune_node.pruneblockchain(400)
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assert_greater_than_or_equal(pruned_height, 2)
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pruned_blockhash = prune_node.getblockhash(2)
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assert_raises_rpc_error(-1, 'Block not available (pruned data)', prune_node.getblock, pruned_blockhash)
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result = prune_node.submitblock(pruned_block)
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assert_equal(result, "inconclusive")
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assert_equal(prune_node.getblock(pruned_blockhash, verbosity=0), pruned_block)
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def run_test(self):
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node = self.nodes[0]
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self.wallet = MiniWallet(node)
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self.mine_chain()
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def assert_submitblock(block, result_str_1, result_str_2=None):
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block.solve()
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result_str_2 = result_str_2 or 'duplicate-invalid'
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assert_equal(result_str_1, node.submitblock(hexdata=block.serialize().hex()))
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assert_equal(result_str_2, node.submitblock(hexdata=block.serialize().hex()))
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self.log.info('getmininginfo')
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mining_info = node.getmininginfo()
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assert_equal(mining_info['blocks'], 200)
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assert_equal(mining_info['chain'], self.chain)
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assert 'currentblocktx' not in mining_info
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assert 'currentblockweight' not in mining_info
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assert_equal(mining_info['bits'], nbits_str(REGTEST_N_BITS))
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assert_equal(mining_info['target'], target_str(REGTEST_TARGET))
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assert_equal(mining_info['difficulty'], Decimal('4.656542373906925E-10'))
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assert_equal(mining_info['next'], {
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'height': 201,
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'target': target_str(REGTEST_TARGET),
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'bits': nbits_str(REGTEST_N_BITS),
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'difficulty': Decimal('4.656542373906925E-10')
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})
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assert_equal(mining_info['networkhashps'], Decimal('0.003333333333333334'))
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assert_equal(mining_info['pooledtx'], 0)
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self.log.info("getblocktemplate: Test default witness commitment")
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txid = int(self.wallet.send_self_transfer(from_node=node)['wtxid'], 16)
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tmpl = node.getblocktemplate(NORMAL_GBT_REQUEST_PARAMS)
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# Check that default_witness_commitment is present.
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assert 'default_witness_commitment' in tmpl
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witness_commitment = tmpl['default_witness_commitment']
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# Check that default_witness_commitment is correct.
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witness_root = CBlock.get_merkle_root([ser_uint256(0),
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ser_uint256(txid)])
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script = get_witness_script(witness_root, 0)
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assert_equal(witness_commitment, script.hex())
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# Mine a block to leave initial block download and clear the mempool
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self.generatetoaddress(node, 1, node.get_deterministic_priv_key().address)
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tmpl = node.getblocktemplate(NORMAL_GBT_REQUEST_PARAMS)
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self.log.info("getblocktemplate: Test capability advertised")
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assert 'proposal' in tmpl['capabilities']
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assert 'coinbasetxn' not in tmpl
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next_height = int(tmpl["height"])
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coinbase_tx = create_coinbase(height=next_height)
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# sequence numbers must not be max for nLockTime to have effect
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coinbase_tx.vin[0].nSequence = 2**32 - 2
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coinbase_tx.rehash()
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block = CBlock()
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block.nVersion = tmpl["version"]
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block.hashPrevBlock = int(tmpl["previousblockhash"], 16)
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block.nTime = tmpl["curtime"]
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block.nBits = int(tmpl["bits"], 16)
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block.nNonce = 0
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block.vtx = [coinbase_tx]
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self.log.info("getblocktemplate: segwit rule must be set")
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assert_raises_rpc_error(-8, "getblocktemplate must be called with the segwit rule set", node.getblocktemplate, {})
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self.log.info("getblocktemplate: Test valid block")
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assert_template(node, block, None)
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self.log.info("submitblock: Test block decode failure")
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assert_raises_rpc_error(-22, "Block decode failed", node.submitblock, block.serialize()[:-15].hex())
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self.log.info("getblocktemplate: Test bad input hash for coinbase transaction")
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bad_block = copy.deepcopy(block)
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bad_block.vtx[0].vin[0].prevout.hash += 1
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bad_block.vtx[0].rehash()
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assert_template(node, bad_block, 'bad-cb-missing')
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self.log.info("submitblock: Test bad input hash for coinbase transaction")
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bad_block.solve()
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assert_equal("bad-cb-missing", node.submitblock(hexdata=bad_block.serialize().hex()))
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self.log.info("submitblock: Test block with no transactions")
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no_tx_block = copy.deepcopy(block)
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no_tx_block.vtx.clear()
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no_tx_block.hashMerkleRoot = 0
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no_tx_block.solve()
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assert_equal("bad-blk-length", node.submitblock(hexdata=no_tx_block.serialize().hex()))
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self.log.info("submitblock: Test empty block")
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assert_equal('high-hash', node.submitblock(hexdata=CBlock().serialize().hex()))
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self.log.info("getblocktemplate: Test truncated final transaction")
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assert_raises_rpc_error(-22, "Block decode failed", node.getblocktemplate, {
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'data': block.serialize()[:-1].hex(),
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'mode': 'proposal',
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'rules': ['segwit'],
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})
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self.log.info("getblocktemplate: Test duplicate transaction")
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bad_block = copy.deepcopy(block)
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bad_block.vtx.append(bad_block.vtx[0])
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assert_template(node, bad_block, 'bad-txns-duplicate')
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assert_submitblock(bad_block, 'bad-txns-duplicate', 'bad-txns-duplicate')
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self.log.info("getblocktemplate: Test invalid transaction")
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bad_block = copy.deepcopy(block)
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bad_tx = copy.deepcopy(bad_block.vtx[0])
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bad_tx.vin[0].prevout.hash = 255
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bad_tx.rehash()
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bad_block.vtx.append(bad_tx)
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assert_template(node, bad_block, 'bad-txns-inputs-missingorspent')
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assert_submitblock(bad_block, 'bad-txns-inputs-missingorspent')
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self.log.info("getblocktemplate: Test nonfinal transaction")
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bad_block = copy.deepcopy(block)
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bad_block.vtx[0].nLockTime = 2**32 - 1
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bad_block.vtx[0].rehash()
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assert_template(node, bad_block, 'bad-txns-nonfinal')
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assert_submitblock(bad_block, 'bad-txns-nonfinal')
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self.log.info("getblocktemplate: Test bad tx count")
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# The tx count is immediately after the block header
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bad_block_sn = bytearray(block.serialize())
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assert_equal(bad_block_sn[BLOCK_HEADER_SIZE], 1)
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bad_block_sn[BLOCK_HEADER_SIZE] += 1
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assert_raises_rpc_error(-22, "Block decode failed", node.getblocktemplate, {
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'data': bad_block_sn.hex(),
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'mode': 'proposal',
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'rules': ['segwit'],
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})
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self.log.info("getblocktemplate: Test bad bits")
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bad_block = copy.deepcopy(block)
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bad_block.nBits = 469762303 # impossible in the real world
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assert_template(node, bad_block, 'bad-diffbits')
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self.log.info("getblocktemplate: Test bad merkle root")
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bad_block = copy.deepcopy(block)
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bad_block.hashMerkleRoot += 1
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assert_template(node, bad_block, 'bad-txnmrklroot', False)
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assert_submitblock(bad_block, 'bad-txnmrklroot', 'bad-txnmrklroot')
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self.log.info("getblocktemplate: Test bad timestamps")
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bad_block = copy.deepcopy(block)
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bad_block.nTime = 2**32 - 1
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assert_template(node, bad_block, 'time-too-new')
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assert_submitblock(bad_block, 'time-too-new', 'time-too-new')
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bad_block.nTime = 0
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assert_template(node, bad_block, 'time-too-old')
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assert_submitblock(bad_block, 'time-too-old', 'time-too-old')
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self.log.info("getblocktemplate: Test not best block")
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bad_block = copy.deepcopy(block)
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bad_block.hashPrevBlock = 123
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assert_template(node, bad_block, 'inconclusive-not-best-prevblk')
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assert_submitblock(bad_block, 'prev-blk-not-found', 'prev-blk-not-found')
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self.log.info('submitheader tests')
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assert_raises_rpc_error(-22, 'Block header decode failed', lambda: node.submitheader(hexdata='xx' * BLOCK_HEADER_SIZE))
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assert_raises_rpc_error(-22, 'Block header decode failed', lambda: node.submitheader(hexdata='ff' * (BLOCK_HEADER_SIZE-2)))
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assert_raises_rpc_error(-25, 'Must submit previous header', lambda: node.submitheader(hexdata=super(CBlock, bad_block).serialize().hex()))
|
|
|
|
block.nTime += 1
|
|
block.solve()
|
|
|
|
def chain_tip(b_hash, *, status='headers-only', branchlen=1):
|
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return {'hash': b_hash, 'height': 202, 'branchlen': branchlen, 'status': status}
|
|
|
|
assert chain_tip(block.hash) not in node.getchaintips()
|
|
node.submitheader(hexdata=block.serialize().hex())
|
|
assert chain_tip(block.hash) in node.getchaintips()
|
|
node.submitheader(hexdata=CBlockHeader(block).serialize().hex()) # Noop
|
|
assert chain_tip(block.hash) in node.getchaintips()
|
|
|
|
bad_block_root = copy.deepcopy(block)
|
|
bad_block_root.hashMerkleRoot += 2
|
|
bad_block_root.solve()
|
|
assert chain_tip(bad_block_root.hash) not in node.getchaintips()
|
|
node.submitheader(hexdata=CBlockHeader(bad_block_root).serialize().hex())
|
|
assert chain_tip(bad_block_root.hash) in node.getchaintips()
|
|
# Should still reject invalid blocks, even if we have the header:
|
|
assert_equal(node.submitblock(hexdata=bad_block_root.serialize().hex()), 'bad-txnmrklroot')
|
|
assert_equal(node.submitblock(hexdata=bad_block_root.serialize().hex()), 'bad-txnmrklroot')
|
|
assert chain_tip(bad_block_root.hash) in node.getchaintips()
|
|
# We know the header for this invalid block, so should just return early without error:
|
|
node.submitheader(hexdata=CBlockHeader(bad_block_root).serialize().hex())
|
|
assert chain_tip(bad_block_root.hash) in node.getchaintips()
|
|
|
|
bad_block_lock = copy.deepcopy(block)
|
|
bad_block_lock.vtx[0].nLockTime = 2**32 - 1
|
|
bad_block_lock.vtx[0].rehash()
|
|
bad_block_lock.hashMerkleRoot = bad_block_lock.calc_merkle_root()
|
|
bad_block_lock.solve()
|
|
assert_equal(node.submitblock(hexdata=bad_block_lock.serialize().hex()), 'bad-txns-nonfinal')
|
|
assert_equal(node.submitblock(hexdata=bad_block_lock.serialize().hex()), 'duplicate-invalid')
|
|
# Build a "good" block on top of the submitted bad block
|
|
bad_block2 = copy.deepcopy(block)
|
|
bad_block2.hashPrevBlock = bad_block_lock.sha256
|
|
bad_block2.solve()
|
|
assert_raises_rpc_error(-25, 'bad-prevblk', lambda: node.submitheader(hexdata=CBlockHeader(bad_block2).serialize().hex()))
|
|
|
|
# Should reject invalid header right away
|
|
bad_block_time = copy.deepcopy(block)
|
|
bad_block_time.nTime = 1
|
|
bad_block_time.solve()
|
|
assert_raises_rpc_error(-25, 'time-too-old', lambda: node.submitheader(hexdata=CBlockHeader(bad_block_time).serialize().hex()))
|
|
|
|
# Should ask for the block from a p2p node, if they announce the header as well:
|
|
peer = node.add_p2p_connection(P2PDataStore())
|
|
peer.wait_for_getheaders(timeout=5, block_hash=block.hashPrevBlock)
|
|
peer.send_blocks_and_test(blocks=[block], node=node)
|
|
# Must be active now:
|
|
assert chain_tip(block.hash, status='active', branchlen=0) in node.getchaintips()
|
|
|
|
# Building a few blocks should give the same results
|
|
self.generatetoaddress(node, 10, node.get_deterministic_priv_key().address)
|
|
assert_raises_rpc_error(-25, 'time-too-old', lambda: node.submitheader(hexdata=CBlockHeader(bad_block_time).serialize().hex()))
|
|
assert_raises_rpc_error(-25, 'bad-prevblk', lambda: node.submitheader(hexdata=CBlockHeader(bad_block2).serialize().hex()))
|
|
node.submitheader(hexdata=CBlockHeader(block).serialize().hex())
|
|
node.submitheader(hexdata=CBlockHeader(bad_block_root).serialize().hex())
|
|
assert_equal(node.submitblock(hexdata=block.serialize().hex()), 'duplicate') # valid
|
|
|
|
self.test_blockmintxfee_parameter()
|
|
self.test_timewarp()
|
|
self.test_pruning()
|
|
|
|
|
|
if __name__ == '__main__':
|
|
MiningTest(__file__).main()
|