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[lbry] blockchain, mempool: validate txscripts

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Co-authored-by: Brannon King <countprimes@gmail.com>
This commit is contained in:
Roy Lee 2018-06-15 13:06:26 -07:00
parent 767a375816
commit 4a987b068d
3 changed files with 13 additions and 7 deletions
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11
blockchain/validate.go
View file

@ -231,8 +231,8 @@ func withinLevelBounds(reduction int64, lv int64) bool {
}
// CheckTransactionSanity performs some preliminary checks on a transaction to
// ensure it is sane. These checks are context free.
func CheckTransactionSanity(tx *btcutil.Tx) error {
// ensure it is sane.
func CheckTransactionSanity(tx *btcutil.Tx, enforceSoftFork bool) error {
// A transaction must have at least one input.
msgTx := tx.MsgTx()
if len(msgTx.TxIn) == 0 {
@ -291,6 +291,11 @@ func CheckTransactionSanity(tx *btcutil.Tx) error {
btcutil.MaxSatoshi)
return ruleError(ErrBadTxOutValue, str)
}
err := txscript.AllClaimsAreSane(txOut.PkScript, enforceSoftFork)
if err != nil {
return ruleError(ErrBadTxOutValue, err.Error())
}
}
// Check for duplicate transaction inputs.
@ -545,7 +550,7 @@ func checkBlockSanity(block *btcutil.Block, powLimit *big.Int, timeSource Median
// Do some preliminary checks on each transaction to ensure they are
// sane before continuing.
for _, tx := range transactions {
err := CheckTransactionSanity(tx)
err := CheckTransactionSanity(tx, false)
if err != nil {
return err
}

2
mempool/mempool.go
View file

@ -963,7 +963,7 @@ func (mp *TxPool) maybeAcceptTransaction(tx *btcutil.Tx, isNew, rateLimit, rejec
// Perform preliminary sanity checks on the transaction. This makes
// use of blockchain which contains the invariant rules for what
// transactions are allowed into blocks.
err := blockchain.CheckTransactionSanity(tx)
err := blockchain.CheckTransactionSanity(tx, true)
if err != nil {
if cerr, ok := err.(blockchain.RuleError); ok {
return nil, nil, chainRuleError(cerr)

7
mempool/policy.go
View file

@ -99,7 +99,7 @@ func checkInputsStandard(tx *btcutil.Tx, utxoView *blockchain.UtxoViewpoint) err
// they have already been checked prior to calling this
// function.
entry := utxoView.LookupEntry(txIn.PreviousOutPoint)
originPkScript := entry.PkScript()
originPkScript := txscript.StripClaimScriptPrefix(entry.PkScript())
switch txscript.GetScriptClass(originPkScript) {
case txscript.ScriptHashTy:
numSigOps := txscript.GetPreciseSigOpCount(
@ -339,8 +339,9 @@ func checkTransactionStandard(tx *btcutil.Tx, height int32,
// be "dust" (except when the script is a null data script).
numNullDataOutputs := 0
for i, txOut := range msgTx.TxOut {
scriptClass := txscript.GetScriptClass(txOut.PkScript)
err := checkPkScriptStandard(txOut.PkScript, scriptClass)
pkScript := txscript.StripClaimScriptPrefix(txOut.PkScript)
scriptClass := txscript.GetScriptClass(pkScript)
err := checkPkScriptStandard(pkScript, scriptClass)
if err != nil {
// Attempt to extract a reject code from the error so
// it can be retained. When not possible, fall back to