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Remove IsFromMe() check in CTxMemPool::accept()

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Fixes issue #2178 : attacker could penny-flood with invalid-signature
transactions to deduce which addresses belonged to your node.

I'm committing this early for code review; I still need to write up
a test plan.

Executive summary of fix: check all transactions received from the network
for penny-flood rate-limiting before adding to the memory pool. But do NOT
ratelimit transactions added to the memory pool:
  - because of blockchain reorgs
  - stored in the wallet and added at startup
  - sent from the GUI or one of the send* RPC commands (CWallet::CommitTransaction)

The limit-free-transactions code really should be a method on CNode, with
counters per-peer. But that is a bigger change for another day.
This commit is contained in:
Gavin Andresen
2013-01-14 16:52:33 -05:00
parent c83c3cbe97
commit ce99358f4a
4 changed files with 31 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/main.h
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@@ -649,7 +649,7 @@ public:
bool CheckTransaction() const;
// Try to accept this transaction into the memory pool
bool AcceptToMemoryPool(bool fCheckInputs=true, bool* pfMissingInputs=NULL);
bool AcceptToMemoryPool(bool fCheckInputs=true, bool fLimitFree = true, bool* pfMissingInputs=NULL);
protected:
static const CTxOut &GetOutputFor(const CTxIn& input, CCoinsViewCache& mapInputs);
@@ -1103,7 +1103,7 @@ public:
int GetDepthInMainChain() const { CBlockIndex *pindexRet; return GetDepthInMainChain(pindexRet); }
bool IsInMainChain() const { return GetDepthInMainChain() > 0; }
int GetBlocksToMaturity() const;
bool AcceptToMemoryPool(bool fCheckInputs=true);
bool AcceptToMemoryPool(bool fCheckInputs=true, bool fLimitFree=true);
};
@@ -1882,7 +1882,7 @@ public:
std::map<uint256, CTransaction> mapTx;
std::map<COutPoint, CInPoint> mapNextTx;
bool accept(CTransaction &tx, bool fCheckInputs, bool* pfMissingInputs);
bool accept(CTransaction &tx, bool fCheckInputs, bool fLimitFree, bool* pfMissingInputs);
bool addUnchecked(const uint256& hash, CTransaction &tx);
bool remove(const CTransaction &tx, bool fRecursive = false);
bool removeConflicts(const CTransaction &tx);