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Utilize anti-DoS headers download strategy

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Avoid permanently storing headers from a peer, unless the headers are part of a
chain with sufficiently high work. This prevents memory attacks using low-work
headers.

Designed and co-authored with Pieter Wuille.
This commit is contained in:
Suhas Daftuar 2022-02-09 09:38:52 -05:00
parent ed470940cd
commit 551a8d957c
9 changed files with 884 additions and 12 deletions
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16
src/validation.cpp
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@ -3432,6 +3432,22 @@ std::vector<unsigned char> ChainstateManager::GenerateCoinbaseCommitment(CBlock&
return commitment;
}
bool HasValidProofOfWork(const std::vector<CBlockHeader>& headers, const Consensus::Params& consensusParams)
{
return std::all_of(headers.cbegin(), headers.cend(),
[&](const auto& header) { return CheckProofOfWork(header.GetHash(), header.nBits, consensusParams);});
}
arith_uint256 CalculateHeadersWork(const std::vector<CBlockHeader>& headers)
{
arith_uint256 total_work{0};
for (const CBlockHeader& header : headers) {
CBlockIndex dummy(header);
total_work += GetBlockProof(dummy);
}
return total_work;
}
/** Context-dependent validity checks.
* By "context", we mean only the previous block headers, but not the UTXO
* set; UTXO-related validity checks are done in ConnectBlock().