[Core + API + Node] Add raw tx size limitation (#2382)

* Define constants for tx-data and check size limit in tx-pool
* Check for raw data size limitation at RPC layer
* Check for raw data size limitation at Network layer

core/tx_pool.go

@@ -179,7 +179,7 @@ var DefaultTxPoolConfig = TxPoolConfig{
 	AccountQueue: 64,
 	GlobalQueue:  1024,
 
-	Lifetime: 3 * time.Hour,
+	Lifetime: 30 * time.Minute,
 
 	Blacklist: map[common.Address]struct{}{},
 }
@@ -657,8 +657,8 @@ func (pool *TxPool) validateTx(tx types.PoolTransaction, local bool) error {
 	if tx.ShardID() != pool.chain.CurrentBlock().ShardID() {
 		return errors.WithMessagef(ErrInvalidShard, "transaction shard is %d", tx.ShardID())
 	}
-	// Heuristic limit, reject transactions over 32KB to prevent DOS attacks
-	if tx.Size() > 32*1024 {
+	// For DOS prevention, reject excessively large transactions.
+	if tx.Size() >= types.MaxPoolTransactionDataSize {
 		return errors.WithMessagef(ErrOversizedData, "transaction size is %s", tx.Size().String())
 	}
 	// Transactions can't be negative. This may never happen using RLP decoded

core/types/tx_pool.go

@@ -11,6 +11,13 @@ import (
 	staking "github.com/harmony-one/harmony/staking/types"
 )
 
+const (
+	//MaxPoolTransactionDataSize is a 32KB heuristic data limit for DOS prevention
+	MaxPoolTransactionDataSize = 32 * 1024
+	//MaxEncodedPoolTransactionSize is a heuristic raw/encoded data size limit. It has an additional 10KB for metadata
+	MaxEncodedPoolTransactionSize = MaxPoolTransactionDataSize + (10 * 1024)
+)
+
 var (
 	// ErrUnknownPoolTxType is returned when attempting to assert a PoolTransaction to its concrete type
 	ErrUnknownPoolTxType = errors.New("unknown transaction type in tx-pool")

internal/hmyapi/apiv1/transactionpool.go

@@ -9,6 +9,7 @@ import (
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/harmony-one/harmony/accounts"
+	"github.com/harmony-one/harmony/core"
 	"github.com/harmony-one/harmony/core/rawdb"
 	"github.com/harmony-one/harmony/core/types"
 	internal_common "github.com/harmony-one/harmony/internal/common"
@@ -209,6 +210,10 @@ func (s *PublicTransactionPoolAPI) SendTransaction(ctx context.Context, args Sen
 func (s *PublicTransactionPoolAPI) SendRawStakingTransaction(
 	ctx context.Context, encodedTx hexutil.Bytes,
 ) (common.Hash, error) {
+	if len(encodedTx) >= types.MaxEncodedPoolTransactionSize {
+		err := errors.Wrapf(core.ErrOversizedData, "encoded tx size: %d", len(encodedTx))
+		return common.Hash{}, err
+	}
 	tx := new(staking.StakingTransaction)
 	if err := rlp.DecodeBytes(encodedTx, tx); err != nil {
 		return common.Hash{}, err
@@ -224,6 +229,10 @@ func (s *PublicTransactionPoolAPI) SendRawStakingTransaction(
 // SendRawTransaction will add the signed transaction to the transaction pool.
 // The sender is responsible for signing the transaction and using the correct nonce.
 func (s *PublicTransactionPoolAPI) SendRawTransaction(ctx context.Context, encodedTx hexutil.Bytes) (common.Hash, error) {
+	if len(encodedTx) >= types.MaxEncodedPoolTransactionSize {
+		err := errors.Wrapf(core.ErrOversizedData, "encoded tx size: %d", len(encodedTx))
+		return common.Hash{}, err
+	}
 	tx := new(types.Transaction)
 	if err := rlp.DecodeBytes(encodedTx, tx); err != nil {
 		return common.Hash{}, err

internal/hmyapi/apiv2/transactionpool.go

@@ -9,6 +9,7 @@ import (
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/harmony-one/harmony/accounts"
+	"github.com/harmony-one/harmony/core"
 	"github.com/harmony-one/harmony/core/rawdb"
 	"github.com/harmony-one/harmony/core/types"
 	internal_common "github.com/harmony-one/harmony/internal/common"
@@ -207,6 +208,10 @@ func (s *PublicTransactionPoolAPI) SendTransaction(ctx context.Context, args Sen
 func (s *PublicTransactionPoolAPI) SendRawStakingTransaction(
 	ctx context.Context, encodedTx hexutil.Bytes,
 ) (common.Hash, error) {
+	if len(encodedTx) >= types.MaxEncodedPoolTransactionSize {
+		err := errors.Wrapf(core.ErrOversizedData, "encoded tx size: %d", len(encodedTx))
+		return common.Hash{}, err
+	}
 	tx := new(staking.StakingTransaction)
 	if err := rlp.DecodeBytes(encodedTx, tx); err != nil {
 		return common.Hash{}, err
@@ -222,6 +227,10 @@ func (s *PublicTransactionPoolAPI) SendRawStakingTransaction(
 // SendRawTransaction will add the signed transaction to the transaction pool.
 // The sender is responsible for signing the transaction and using the correct nonce.
 func (s *PublicTransactionPoolAPI) SendRawTransaction(ctx context.Context, encodedTx hexutil.Bytes) (common.Hash, error) {
+	if len(encodedTx) >= types.MaxEncodedPoolTransactionSize {
+		err := errors.Wrapf(core.ErrOversizedData, "encoded tx size: %d", len(encodedTx))
+		return common.Hash{}, err
+	}
 	tx := new(types.Transaction)
 	if err := rlp.DecodeBytes(encodedTx, tx); err != nil {
 		return common.Hash{}, err

node/node_handler.go

@@ -13,6 +13,7 @@ import (
 	proto_discovery "github.com/harmony-one/harmony/api/proto/discovery"
 	proto_node "github.com/harmony-one/harmony/api/proto/node"
 	"github.com/harmony-one/harmony/block"
+	"github.com/harmony-one/harmony/core"
 	"github.com/harmony-one/harmony/core/types"
 	nodeconfig "github.com/harmony-one/harmony/internal/configs/node"
 	"github.com/harmony-one/harmony/internal/ctxerror"
@@ -187,6 +188,10 @@ func (node *Node) HandleMessage(content []byte, sender libp2p_peer.ID) {
 }
 
 func (node *Node) transactionMessageHandler(msgPayload []byte) {
+	if len(msgPayload) >= types.MaxEncodedPoolTransactionSize {
+		utils.Logger().Warn().Err(core.ErrOversizedData).Msgf("encoded tx size: %d", len(msgPayload))
+		return
+	}
 	if len(msgPayload) < 1 {
 		utils.Logger().Debug().Msgf("Invalid transaction message size")
 		return
@@ -208,6 +213,10 @@ func (node *Node) transactionMessageHandler(msgPayload []byte) {
 }
 
 func (node *Node) stakingMessageHandler(msgPayload []byte) {
+	if len(msgPayload) >= types.MaxEncodedPoolTransactionSize {
+		utils.Logger().Warn().Err(core.ErrOversizedData).Msgf("encoded tx size: %d", len(msgPayload))
+		return
+	}
 	if len(msgPayload) < 1 {
 		utils.Logger().Debug().Msgf("Invalid staking transaction message size")
 		return