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Sanity check transaction scripts in DecodeHexTx

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Make sure that the scripts of decoded transactions are valid scripts.
This commit is contained in:
Andrew Chow
2017-05-30 15:43:07 -07:00
parent 5b75c47784
commit ac4e438229
3 changed files with 31 additions and 4 deletions
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29
src/core_read.cpp
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@@ -88,10 +88,32 @@ CScript ParseScript(const std::string& s)
return result;
}
// Check that all of the input and output scripts of a transaction contains valid opcodes
bool CheckTxScriptsSanity(const CMutableTransaction& tx)
{
// Check input scripts for non-coinbase txs
if (!CTransaction(tx).IsCoinBase()) {
for (unsigned int i = 0; i < tx.vin.size(); i++) {
if (!tx.vin[i].scriptSig.HasValidOps() || tx.vin[i].scriptSig.size() > MAX_SCRIPT_SIZE) {
return false;
}
}
}
// Check output scripts
for (unsigned int i = 0; i < tx.vout.size(); i++) {
if (!tx.vout[i].scriptPubKey.HasValidOps() || tx.vout[i].scriptPubKey.size() > MAX_SCRIPT_SIZE) {
return false;
}
}
return true;
}
bool DecodeHexTx(CMutableTransaction& tx, const std::string& strHexTx, bool fTryNoWitness)
{
if (!IsHex(strHexTx))
if (!IsHex(strHexTx)) {
return false;
}
std::vector<unsigned char> txData(ParseHex(strHexTx));
@@ -99,7 +121,7 @@ bool DecodeHexTx(CMutableTransaction& tx, const std::string& strHexTx, bool fTry
CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS);
try {
ssData >> tx;
if (ssData.eof()) {
if (ssData.eof() && CheckTxScriptsSanity(tx)) {
return true;
}
}
@@ -111,8 +133,9 @@ bool DecodeHexTx(CMutableTransaction& tx, const std::string& strHexTx, bool fTry
CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION);
try {
ssData >> tx;
if (!ssData.empty())
if (!ssData.empty()) {
return false;
}
}
catch (const std::exception&) {
return false;