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59 lines
2.5 KiB
59 lines
2.5 KiB
// Copyright (c) 2017-2019 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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#include <consensus/tx_check.h>
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#include <primitives/transaction.h>
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#include <consensus/validation.h>
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bool CheckTransaction(const CTransaction& tx, TxValidationState& state)
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{
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// Basic checks that don't depend on any context
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if (tx.vin.empty())
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return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vin-empty");
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if (tx.vout.empty())
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return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vout-empty");
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// Size limits (this doesn't take the witness into account, as that hasn't been checked for malleability)
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if (::GetSerializeSize(tx, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * WITNESS_SCALE_FACTOR > MAX_BLOCK_WEIGHT)
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return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-oversize");
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// Check for negative or overflow output values (see CVE-2010-5139)
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CAmount nValueOut = 0;
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for (const auto& txout : tx.vout)
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{
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if (txout.nValue < 0)
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return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vout-negative");
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if (txout.nValue > MAX_MONEY)
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return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vout-toolarge");
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nValueOut += txout.nValue;
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if (!MoneyRange(nValueOut))
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return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-txouttotal-toolarge");
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}
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// Check for duplicate inputs (see CVE-2018-17144)
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// While Consensus::CheckTxInputs does check if all inputs of a tx are available, and UpdateCoins marks all inputs
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// of a tx as spent, it does not check if the tx has duplicate inputs.
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// Failure to run this check will result in either a crash or an inflation bug, depending on the implementation of
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// the underlying coins database.
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std::set<COutPoint> vInOutPoints;
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for (const auto& txin : tx.vin) {
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if (!vInOutPoints.insert(txin.prevout).second)
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return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-inputs-duplicate");
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}
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if (tx.IsCoinBase())
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{
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if (tx.vin[0].scriptSig.size() < 2 || tx.vin[0].scriptSig.size() > 100)
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return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-cb-length");
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}
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else
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{
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for (const auto& txin : tx.vin)
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if (txin.prevout.IsNull())
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return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-prevout-null");
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}
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return true;
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}
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