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Do not invoke anti-DoS system for invalid BIP16 transactions

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Doing so would allow an attack on old nodes, which would relay a
standard transaction spending a BIP16 output in an invalid way,
until reaching a new node, which will disconnect their peer.

Reported by makomk on IRC.
This commit is contained in:
Pieter Wuille 2012-02-25 19:02:30 +01:00
parent 1168d30b0a
commit db9f2e0117
1 changed files with 7 additions and 0 deletions
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7
src/main.cpp
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@ -1138,8 +1138,15 @@ bool CTransaction::ConnectInputs(MapPrevTx inputs,
{
// Verify signature
if (!VerifySignature(txPrev, *this, i, fStrictPayToScriptHash, 0))
{
// only during transition phase for P2SH: do not invoke anti-DoS code for
// potentially old clients relaying bad P2SH transactions
if (fStrictPayToScriptHash && VerifySignature(txPrev, *this, i, false, 0))
return error("ConnectInputs() : %s P2SH VerifySignature failed", GetHash().ToString().substr(0,10).c_str());
return DoS(100,error("ConnectInputs() : %s VerifySignature failed", GetHash().ToString().substr(0,10).c_str()));
}
}
// Mark outpoints as spent
txindex.vSpent[prevout.n] = posThisTx;