laconicd-deprecated/app/ante/eth.go
Federico Kunze Küllmer 4cb2737647
ante: update ante handler internals (#866)
* update ante handler internals

* update options

* changelog
2022-01-02 23:44:46 +01:00

570 lines
20 KiB
Go
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

package ante
import (
"errors"
"math/big"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
authante "github.com/cosmos/cosmos-sdk/x/auth/ante"
ethermint "github.com/tharsis/ethermint/types"
evmkeeper "github.com/tharsis/ethermint/x/evm/keeper"
evmtypes "github.com/tharsis/ethermint/x/evm/types"
"github.com/ethereum/go-ethereum/common"
ethtypes "github.com/ethereum/go-ethereum/core/types"
)
// EthSigVerificationDecorator validates an ethereum signatures
type EthSigVerificationDecorator struct {
evmKeeper EVMKeeper
}
// NewEthSigVerificationDecorator creates a new EthSigVerificationDecorator
func NewEthSigVerificationDecorator(ek EVMKeeper) EthSigVerificationDecorator {
return EthSigVerificationDecorator{
evmKeeper: ek,
}
}
// AnteHandle validates checks that the registered chain id is the same as the one on the message, and
// that the signer address matches the one defined on the message.
// It's not skipped for RecheckTx, because it set `From` address which is critical from other ante handler to work.
// Failure in RecheckTx will prevent tx to be included into block, especially when CheckTx succeed, in which case user
// won't see the error message.
func (esvd EthSigVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
if tx == nil || len(tx.GetMsgs()) != 1 {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "only 1 ethereum msg supported per tx")
}
chainID := esvd.evmKeeper.ChainID()
params := esvd.evmKeeper.GetParams(ctx)
ethCfg := params.ChainConfig.EthereumConfig(chainID)
blockNum := big.NewInt(ctx.BlockHeight())
signer := ethtypes.MakeSigner(ethCfg, blockNum)
msg := tx.GetMsgs()[0]
msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil))
}
sender, err := signer.Sender(msgEthTx.AsTransaction())
if err != nil {
return ctx, sdkerrors.Wrapf(
sdkerrors.ErrorInvalidSigner,
"couldn't retrieve sender address ('%s') from the ethereum transaction: %s",
msgEthTx.From,
err.Error(),
)
}
// set up the sender to the transaction field if not already
msgEthTx.From = sender.Hex()
return next(ctx, msgEthTx, simulate)
}
// EthAccountVerificationDecorator validates an account balance checks
type EthAccountVerificationDecorator struct {
ak evmtypes.AccountKeeper
bankKeeper evmtypes.BankKeeper
evmKeeper EVMKeeper
}
// NewEthAccountVerificationDecorator creates a new EthAccountVerificationDecorator
func NewEthAccountVerificationDecorator(ak evmtypes.AccountKeeper, bankKeeper evmtypes.BankKeeper, ek EVMKeeper) EthAccountVerificationDecorator {
return EthAccountVerificationDecorator{
ak: ak,
bankKeeper: bankKeeper,
evmKeeper: ek,
}
}
// AnteHandle validates checks that the sender balance is greater than the total transaction cost.
// The account will be set to store if it doesn't exis, i.e cannot be found on store.
// This AnteHandler decorator will fail if:
// - any of the msgs is not a MsgEthereumTx
// - from address is empty
// - account balance is lower than the transaction cost
func (avd EthAccountVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
if !ctx.IsCheckTx() {
return next(ctx, tx, simulate)
}
avd.evmKeeper.WithContext(ctx)
evmDenom := avd.evmKeeper.GetParams(ctx).EvmDenom
for i, msg := range tx.GetMsgs() {
msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil))
}
txData, err := evmtypes.UnpackTxData(msgEthTx.Data)
if err != nil {
return ctx, sdkerrors.Wrapf(err, "failed to unpack tx data any for tx %d", i)
}
// sender address should be in the tx cache from the previous AnteHandle call
from := msgEthTx.GetFrom()
if from.Empty() {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInvalidAddress, "from address cannot be empty")
}
// check whether the sender address is EOA
fromAddr := common.BytesToAddress(from)
codeHash := avd.evmKeeper.GetCodeHash(fromAddr)
if codeHash != common.BytesToHash(evmtypes.EmptyCodeHash) {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrInvalidType,
"the sender is not EOA: address <%v>, codeHash <%s>", fromAddr, codeHash)
}
acc := avd.ak.GetAccount(ctx, from)
if acc == nil {
acc = avd.ak.NewAccountWithAddress(ctx, from)
avd.ak.SetAccount(ctx, acc)
}
if err := evmkeeper.CheckSenderBalance(ctx, avd.bankKeeper, from, txData, evmDenom); err != nil {
return ctx, sdkerrors.Wrap(err, "failed to check sender balance")
}
}
// recover the original gas meter
avd.evmKeeper.WithContext(ctx)
return next(ctx, tx, simulate)
}
// EthNonceVerificationDecorator checks that the account nonce from the transaction matches
// the sender account sequence.
type EthNonceVerificationDecorator struct {
ak evmtypes.AccountKeeper
}
// NewEthNonceVerificationDecorator creates a new EthNonceVerificationDecorator
func NewEthNonceVerificationDecorator(ak evmtypes.AccountKeeper) EthNonceVerificationDecorator {
return EthNonceVerificationDecorator{
ak: ak,
}
}
// AnteHandle validates that the transaction nonces are valid and equivalent to the sender accounts
// current nonce.
func (nvd EthNonceVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
// no need to check the nonce on ReCheckTx
if ctx.IsReCheckTx() {
return next(ctx, tx, simulate)
}
for _, msg := range tx.GetMsgs() {
msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil))
}
// sender address should be in the tx cache from the previous AnteHandle call
seq, err := nvd.ak.GetSequence(ctx, msgEthTx.GetFrom())
if err != nil {
return ctx, sdkerrors.Wrapf(err, "sequence not found for address %s", msgEthTx.From)
}
txData, err := evmtypes.UnpackTxData(msgEthTx.Data)
if err != nil {
return ctx, sdkerrors.Wrap(err, "failed to unpack tx data")
}
// if multiple transactions are submitted in succession with increasing nonces,
// all will be rejected except the first, since the first needs to be included in a block
// before the sequence increments
if txData.GetNonce() != seq {
return ctx, sdkerrors.Wrapf(
sdkerrors.ErrInvalidSequence,
"invalid nonce; got %d, expected %d", txData.GetNonce(), seq,
)
}
}
return next(ctx, tx, simulate)
}
// EthGasConsumeDecorator validates enough intrinsic gas for the transaction and
// gas consumption.
type EthGasConsumeDecorator struct {
evmKeeper EVMKeeper
}
// NewEthGasConsumeDecorator creates a new EthGasConsumeDecorator
func NewEthGasConsumeDecorator(
evmKeeper EVMKeeper,
) EthGasConsumeDecorator {
return EthGasConsumeDecorator{
evmKeeper: evmKeeper,
}
}
// AnteHandle validates that the Ethereum tx message has enough to cover intrinsic gas
// (during CheckTx only) and that the sender has enough balance to pay for the gas cost.
//
// Intrinsic gas for a transaction is the amount of gas that the transaction uses before the
// transaction is executed. The gas is a constant value plus any cost inccured by additional bytes
// of data supplied with the transaction.
//
// This AnteHandler decorator will fail if:
// - the transaction contains more than one message
// - the message is not a MsgEthereumTx
// - sender account cannot be found
// - transaction's gas limit is lower than the intrinsic gas
// - user doesn't have enough balance to deduct the transaction fees (gas_limit * gas_price)
// - transaction or block gas meter runs out of gas
func (egcd EthGasConsumeDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
// reset the refund gas value in the keeper for the current transaction
egcd.evmKeeper.ResetRefundTransient(ctx)
params := egcd.evmKeeper.GetParams(ctx)
ethCfg := params.ChainConfig.EthereumConfig(egcd.evmKeeper.ChainID())
blockHeight := big.NewInt(ctx.BlockHeight())
homestead := ethCfg.IsHomestead(blockHeight)
istanbul := ethCfg.IsIstanbul(blockHeight)
london := ethCfg.IsLondon(blockHeight)
evmDenom := params.EvmDenom
var events sdk.Events
for _, msg := range tx.GetMsgs() {
msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil))
}
txData, err := evmtypes.UnpackTxData(msgEthTx.Data)
if err != nil {
return ctx, sdkerrors.Wrap(err, "failed to unpack tx data")
}
fees, err := egcd.evmKeeper.DeductTxCostsFromUserBalance(
ctx,
*msgEthTx,
txData,
evmDenom,
homestead,
istanbul,
london,
)
if err != nil {
return ctx, sdkerrors.Wrapf(err, "failed to deduct transaction costs from user balance")
}
events = append(events, sdk.NewEvent(sdk.EventTypeTx, sdk.NewAttribute(sdk.AttributeKeyFee, fees.String())))
}
// TODO: change to typed events
ctx.EventManager().EmitEvents(events)
// TODO: deprecate after https://github.com/cosmos/cosmos-sdk/issues/9514 is fixed on SDK
blockGasLimit := ethermint.BlockGasLimit(ctx)
// NOTE: safety check
if blockGasLimit > 0 {
// generate a copy of the gas pool (i.e block gas meter) to see if we've run out of gas for this block
// if current gas consumed is greater than the limit, this funcion panics and the error is recovered on the Baseapp
gasPool := sdk.NewGasMeter(blockGasLimit)
gasPool.ConsumeGas(ctx.GasMeter().GasConsumedToLimit(), "gas pool check")
}
// we know that we have enough gas on the pool to cover the intrinsic gas
// set up the updated context to the evm Keeper
egcd.evmKeeper.WithContext(ctx)
return next(ctx, tx, simulate)
}
// CanTransferDecorator checks if the sender is allowed to transfer funds according to the EVM block
// context rules.
type CanTransferDecorator struct {
evmKeeper EVMKeeper
feemarketKeeper evmtypes.FeeMarketKeeper
}
// NewCanTransferDecorator creates a new CanTransferDecorator instance.
func NewCanTransferDecorator(evmKeeper EVMKeeper, fmk evmtypes.FeeMarketKeeper) CanTransferDecorator {
return CanTransferDecorator{
evmKeeper: evmKeeper,
feemarketKeeper: fmk,
}
}
// AnteHandle creates an EVM from the message and calls the BlockContext CanTransfer function to
// see if the address can execute the transaction.
func (ctd CanTransferDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
ctd.evmKeeper.WithContext(ctx)
params := ctd.evmKeeper.GetParams(ctx)
ethCfg := params.ChainConfig.EthereumConfig(ctd.evmKeeper.ChainID())
signer := ethtypes.MakeSigner(ethCfg, big.NewInt(ctx.BlockHeight()))
for _, msg := range tx.GetMsgs() {
msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil))
}
baseFee := ctd.evmKeeper.BaseFee(ctx, ethCfg)
coreMsg, err := msgEthTx.AsMessage(signer, baseFee)
if err != nil {
return ctx, sdkerrors.Wrapf(
err,
"failed to create an ethereum core.Message from signer %T", signer,
)
}
// NOTE: pass in an empty coinbase address and nil tracer as we don't need them for the check below
cfg := &evmtypes.EVMConfig{
ChainConfig: ethCfg,
Params: params,
CoinBase: common.Address{},
BaseFee: baseFee,
}
evm := ctd.evmKeeper.NewEVM(coreMsg, cfg, evmtypes.NewNoOpTracer())
// check that caller has enough balance to cover asset transfer for **topmost** call
// NOTE: here the gas consumed is from the context with the infinite gas meter
if coreMsg.Value().Sign() > 0 && !evm.Context.CanTransfer(ctd.evmKeeper, coreMsg.From(), coreMsg.Value()) {
return ctx, sdkerrors.Wrapf(
sdkerrors.ErrInsufficientFunds,
"failed to transfer %s from address %s using the EVM block context transfer function",
coreMsg.Value(),
coreMsg.From(),
)
}
if evmtypes.IsLondon(ethCfg, ctx.BlockHeight()) {
if baseFee == nil {
return ctx, sdkerrors.Wrap(
evmtypes.ErrInvalidBaseFee,
"base fee is supported but evm block context value is nil",
)
}
if coreMsg.GasFeeCap().Cmp(baseFee) < 0 {
return ctx, sdkerrors.Wrapf(
evmtypes.ErrInvalidBaseFee,
"max fee per gas less than block base fee (%s < %s)",
coreMsg.GasFeeCap(), baseFee,
)
}
}
}
// set the original gas meter
return next(ctx, tx, simulate)
}
// EthIncrementSenderSequenceDecorator increments the sequence of the signers.
type EthIncrementSenderSequenceDecorator struct {
ak evmtypes.AccountKeeper
}
// NewEthIncrementSenderSequenceDecorator creates a new EthIncrementSenderSequenceDecorator.
func NewEthIncrementSenderSequenceDecorator(ak evmtypes.AccountKeeper) EthIncrementSenderSequenceDecorator {
return EthIncrementSenderSequenceDecorator{
ak: ak,
}
}
// AnteHandle handles incrementing the sequence of the signer (i.e sender). If the transaction is a
// contract creation, the nonce will be incremented during the transaction execution and not within
// this AnteHandler decorator.
func (issd EthIncrementSenderSequenceDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
for _, msg := range tx.GetMsgs() {
// increment sequence of all signers
for _, addr := range msg.GetSigners() {
acc := issd.ak.GetAccount(ctx, addr)
if acc == nil {
return ctx, sdkerrors.Wrapf(
sdkerrors.ErrUnknownAddress,
"account %s (%s) is nil", common.BytesToAddress(addr.Bytes()), addr,
)
}
if err := acc.SetSequence(acc.GetSequence() + 1); err != nil {
return ctx, sdkerrors.Wrapf(err, "failed to set sequence to %d", acc.GetSequence()+1)
}
issd.ak.SetAccount(ctx, acc)
}
}
return next(ctx, tx, simulate)
}
// EthValidateBasicDecorator is adapted from ValidateBasicDecorator from cosmos-sdk, it ignores ErrNoSignatures
type EthValidateBasicDecorator struct {
evmKeeper EVMKeeper
}
// NewEthValidateBasicDecorator creates a new EthValidateBasicDecorator
func NewEthValidateBasicDecorator(ek EVMKeeper) EthValidateBasicDecorator {
return EthValidateBasicDecorator{
evmKeeper: ek,
}
}
// AnteHandle handles basic validation of tx
func (vbd EthValidateBasicDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
// no need to validate basic on recheck tx, call next antehandler
if ctx.IsReCheckTx() {
return next(ctx, tx, simulate)
}
vbd.evmKeeper.WithContext(ctx)
err := tx.ValidateBasic()
// ErrNoSignatures is fine with eth tx
if err != nil && !errors.Is(err, sdkerrors.ErrNoSignatures) {
return ctx, sdkerrors.Wrap(err, "tx basic validation failed")
}
// For eth type cosmos tx, some fields should be veified as zero values,
// since we will only verify the signature against the hash of the MsgEthereumTx.Data
if wrapperTx, ok := tx.(protoTxProvider); ok {
protoTx := wrapperTx.GetProtoTx()
body := protoTx.Body
if body.Memo != "" || body.TimeoutHeight != uint64(0) || len(body.NonCriticalExtensionOptions) > 0 {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest,
"for eth tx body Memo TimeoutHeight NonCriticalExtensionOptions should be empty")
}
if len(body.ExtensionOptions) != 1 {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "for eth tx length of ExtensionOptions should be 1")
}
if len(protoTx.GetMsgs()) != 1 {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "only 1 ethereum msg supported per tx")
}
msg := protoTx.GetMsgs()[0]
msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil))
}
ethGasLimit := msgEthTx.GetGas()
txData, err := evmtypes.UnpackTxData(msgEthTx.Data)
if err != nil {
return ctx, sdkerrors.Wrap(err, "failed to unpack MsgEthereumTx Data")
}
params := vbd.evmKeeper.GetParams(ctx)
chainID := vbd.evmKeeper.ChainID()
ethCfg := params.ChainConfig.EthereumConfig(chainID)
baseFee := vbd.evmKeeper.BaseFee(ctx, ethCfg)
if baseFee == nil && txData.TxType() == ethtypes.DynamicFeeTxType {
return ctx, sdkerrors.Wrap(ethtypes.ErrTxTypeNotSupported, "dynamic fee tx not supported")
}
ethFeeAmount := sdk.Coins{sdk.NewCoin(params.EvmDenom, sdk.NewIntFromBigInt(txData.Fee()))}
authInfo := protoTx.AuthInfo
if len(authInfo.SignerInfos) > 0 {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "for eth tx AuthInfo SignerInfos should be empty")
}
if authInfo.Fee.Payer != "" || authInfo.Fee.Granter != "" {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "for eth tx AuthInfo Fee payer and granter should be empty")
}
if !authInfo.Fee.Amount.IsEqual(ethFeeAmount) {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "invalid eth tx AuthInfo Fee Amount")
}
if authInfo.Fee.GasLimit != ethGasLimit {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "invalid eth tx AuthInfo Fee GasLimit")
}
sigs := protoTx.Signatures
if len(sigs) > 0 {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "for eth tx Signatures should be empty")
}
}
return next(ctx, tx, simulate)
}
// EthSetupContextDecorator is adapted from SetUpContextDecorator from cosmos-sdk, it ignores gas consumption
// by setting the gas meter to infinite
type EthSetupContextDecorator struct{}
func NewEthSetUpContextDecorator() EthSetupContextDecorator {
return EthSetupContextDecorator{}
}
func (esc EthSetupContextDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
// all transactions must implement GasTx
_, ok := tx.(authante.GasTx)
if !ok {
return newCtx, sdkerrors.Wrap(sdkerrors.ErrTxDecode, "Tx must be GasTx")
}
newCtx = ctx.WithGasMeter(sdk.NewInfiniteGasMeter())
return next(newCtx, tx, simulate)
}
// EthMempoolFeeDecorator will check if the transaction's effective fee is at least as large
// as the local validator's minimum gasFee (defined in validator config).
// If fee is too low, decorator returns error and tx is rejected from mempool.
// Note this only applies when ctx.CheckTx = true
// If fee is high enough or not CheckTx, then call next AnteHandler
// CONTRACT: Tx must implement FeeTx to use MempoolFeeDecorator
type EthMempoolFeeDecorator struct {
feemarketKeeper evmtypes.FeeMarketKeeper
evmKeeper EVMKeeper
}
func NewEthMempoolFeeDecorator(ek EVMKeeper, fmk evmtypes.FeeMarketKeeper) EthMempoolFeeDecorator {
return EthMempoolFeeDecorator{
feemarketKeeper: fmk,
evmKeeper: ek,
}
}
// AnteHandle ensures that the provided fees meet a minimum threshold for the validator,
// if this is a CheckTx. This is only for local mempool purposes, and thus
// is only ran on check tx.
func (mfd EthMempoolFeeDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
if ctx.IsCheckTx() && !simulate {
if len(tx.GetMsgs()) != 1 {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "only 1 ethereum msg supported per tx")
}
msg, ok := tx.GetMsgs()[0].(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil))
}
var feeAmt *big.Int
params := mfd.evmKeeper.GetParams(ctx)
chainID := mfd.evmKeeper.ChainID()
ethCfg := params.ChainConfig.EthereumConfig(chainID)
evmDenom := params.EvmDenom
baseFee := mfd.evmKeeper.BaseFee(ctx, ethCfg)
if baseFee != nil {
feeAmt = msg.GetEffectiveFee(baseFee)
} else {
feeAmt = msg.GetFee()
}
glDec := sdk.NewDec(int64(msg.GetGas()))
requiredFee := ctx.MinGasPrices().AmountOf(evmDenom).Mul(glDec)
if sdk.NewDecFromBigInt(feeAmt).LT(requiredFee) {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrInsufficientFee, "insufficient fees; got: %s required: %s", feeAmt, requiredFee)
}
}
return next(ctx, tx, simulate)
}