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[net processing] Don't process mutated blocks

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We preemptively perform a block mutation check before further processing
a block message (similar to early sanity checks on other messsage
types). The main reasons for this change are as follows:

- `CBlock::GetHash()` is a foot-gun without a prior mutation check, as
  the hash returned only commits to the header but not to the actual
  transactions (`CBlock::vtx`) contained in the block.
- We have observed attacks that abused mutated blocks in the past, which
  could have been prevented by simply not processing mutated blocks
  (e.g. https://github.com/bitcoin/bitcoin/pull/27608).
This commit is contained in:
dergoegge 2024-01-19 15:25:01 +00:00
parent 2d8495e080
commit 49257c0304
1 changed files with 10 additions and 1 deletions
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11
src/net_processing.cpp
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@ -4719,6 +4719,16 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
LogPrint(BCLog::NET, "received block %s peer=%d\n", pblock->GetHash().ToString(), pfrom.GetId());
const CBlockIndex* prev_block{WITH_LOCK(m_chainman.GetMutex(), return m_chainman.m_blockman.LookupBlockIndex(pblock->hashPrevBlock))};
if (IsBlockMutated(/*block=*/*pblock,
/*check_witness_root=*/DeploymentActiveAfter(prev_block, m_chainman, Consensus::DEPLOYMENT_SEGWIT))) {
LogDebug(BCLog::NET, "Received mutated block from peer=%d\n", peer->m_id);
Misbehaving(*peer, 100, "mutated block");
WITH_LOCK(cs_main, RemoveBlockRequest(pblock->GetHash(), peer->m_id));
return;
}
bool forceProcessing = false;
const uint256 hash(pblock->GetHash());
bool min_pow_checked = false;
@ -4734,7 +4744,6 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
mapBlockSource.emplace(hash, std::make_pair(pfrom.GetId(), true));
// Check work on this block against our anti-dos thresholds.
const CBlockIndex* prev_block = m_chainman.m_blockman.LookupBlockIndex(pblock->hashPrevBlock);
if (prev_block && prev_block->nChainWork + CalculateHeadersWork({pblock->GetBlockHeader()}) >= GetAntiDoSWorkThreshold()) {
min_pow_checked = true;
}