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testnet: Add timewarp attack prevention for Testnet4

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Fabian Jahr 2024-05-03 10:05:48 +09:00
parent 0100907ca1
commit 6bfa26048d
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1 changed files with 12 additions and 0 deletions
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src/validation.cpp
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@ -4182,6 +4182,18 @@ static bool ContextualCheckBlockHeader(const CBlockHeader& block, BlockValidatio
if (block.GetBlockTime() <= pindexPrev->GetMedianTimePast()) if (block.GetBlockTime() <= pindexPrev->GetMedianTimePast())
return state.Invalid(BlockValidationResult::BLOCK_INVALID_HEADER, "time-too-old", "block's timestamp is too early"); return state.Invalid(BlockValidationResult::BLOCK_INVALID_HEADER, "time-too-old", "block's timestamp is too early");
// Testnet4 only: Check timestamp against prev for difficulty-adjustment
// blocks to prevent timewarp attacks (see https://github.com/bitcoin/bitcoin/pull/15482).
if (consensusParams.enforce_BIP94) {
// Check timestamp for the first block of each difficulty adjustment
// interval, except the genesis block.
if (nHeight % consensusParams.DifficultyAdjustmentInterval() == 0) {
if (block.GetBlockTime() < pindexPrev->GetBlockTime() - 60 * 60 * 2) {
return state.Invalid(BlockValidationResult::BLOCK_INVALID_HEADER, "time-timewarp-attack", "block's timestamp is too early on diff adjustment block");
}
}
}
// Check timestamp // Check timestamp
if (block.Time() > NodeClock::now() + std::chrono::seconds{MAX_FUTURE_BLOCK_TIME}) { if (block.Time() > NodeClock::now() + std::chrono::seconds{MAX_FUTURE_BLOCK_TIME}) {
return state.Invalid(BlockValidationResult::BLOCK_TIME_FUTURE, "time-too-new", "block timestamp too far in the future"); return state.Invalid(BlockValidationResult::BLOCK_TIME_FUTURE, "time-too-new", "block timestamp too far in the future");