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Add timewarp attack mitigation test

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Sjors Provoost 2024-08-20 18:49:59 +02:00
parent e85f386c4b
commit e929054e12
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1 changed files with 44 additions and 0 deletions
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test/functional/mining_basic.py
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@ -34,6 +34,9 @@ from test_framework.util import (
from test_framework.wallet import MiniWallet
DIFFICULTY_ADJUSTMENT_INTERVAL = 144
MAX_FUTURE_BLOCK_TIME = 2 * 3600
MAX_TIMEWARP = 600
VERSIONBITS_TOP_BITS = 0x20000000
VERSIONBITS_DEPLOYMENT_TESTDUMMY_BIT = 28
DEFAULT_BLOCK_MIN_TX_FEE = 1000 # default `-blockmintxfee` setting [sat/kvB]
@ -115,6 +118,46 @@ class MiningTest(BitcoinTestFramework):
assert tx_below_min_feerate['txid'] not in block_template_txids
assert tx_below_min_feerate['txid'] not in block_txids
def test_timewarp(self):
self.log.info("Test timewarp attack mitigation (BIP94)")
node = self.nodes[0]
self.log.info("Mine until the last block of the retarget period")
blockchain_info = self.nodes[0].getblockchaininfo()
n = DIFFICULTY_ADJUSTMENT_INTERVAL - blockchain_info['blocks'] % DIFFICULTY_ADJUSTMENT_INTERVAL - 2
t = blockchain_info['time']
for _ in range(n):
t += 600
self.nodes[0].setmocktime(t)
self.generate(self.wallet, 1, sync_fun=self.no_op)
self.log.info("Create block two hours in the future")
self.nodes[0].setmocktime(t + MAX_FUTURE_BLOCK_TIME)
self.generate(self.wallet, 1, sync_fun=self.no_op)
assert_equal(node.getblock(node.getbestblockhash())['time'], t + MAX_FUTURE_BLOCK_TIME)
self.log.info("First block template of retarget period can't use wall clock time")
self.nodes[0].setmocktime(t)
assert_raises_rpc_error(-1, "time-timewarp-attack, block's timestamp is too early on diff adjustment block",
lambda: node.getblocktemplate(NORMAL_GBT_REQUEST_PARAMS))
# Create template with an acceptable timestamp and then modify it
self.nodes[0].setmocktime(t + MAX_FUTURE_BLOCK_TIME)
tmpl = node.getblocktemplate(NORMAL_GBT_REQUEST_PARAMS)
block = CBlock()
block.nVersion = tmpl["version"]
block.hashPrevBlock = int(tmpl["previousblockhash"], 16)
block.nTime = t
block.nBits = int(tmpl["bits"], 16)
block.nNonce = 0
block.vtx = [create_coinbase(height=int(tmpl["height"]))]
block.solve()
self.nodes[0].setmocktime(t)
assert_raises_rpc_error(-25, 'time-timewarp-attack', lambda: node.submitheader(hexdata=CBlockHeader(block).serialize().hex()))
def run_test(self):
node = self.nodes[0]
self.wallet = MiniWallet(node)
@ -322,6 +365,7 @@ class MiningTest(BitcoinTestFramework):
assert_equal(node.submitblock(hexdata=block.serialize().hex()), 'duplicate') # valid
self.test_blockmintxfee_parameter()
self.test_timewarp()
if __name__ == '__main__':