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sigverify.go
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sigverify.go
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// Copyright 2022 Evmos Foundation
// This file is part of the Evmos Network packages.
//
// Evmos is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The Evmos packages are distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the Evmos packages. If not, see https://github.com/evmos/evmos/blob/main/LICENSE
package evm
import (
"math/big"
errorsmod "cosmossdk.io/errors"
sdk "github.com/cosmos/cosmos-sdk/types"
errortypes "github.com/cosmos/cosmos-sdk/types/errors"
ethtypes "github.com/ethereum/go-ethereum/core/types"
evmtypes "github.com/evmos/evmos/v12/x/evm/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) {
chainID := esvd.evmKeeper.ChainID()
evmParams := esvd.evmKeeper.GetParams(ctx)
chainCfg := evmParams.GetChainConfig()
ethCfg := chainCfg.EthereumConfig(chainID)
blockNum := big.NewInt(ctx.BlockHeight())
signer := ethtypes.MakeSigner(ethCfg, blockNum)
for _, msg := range tx.GetMsgs() {
msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, errorsmod.Wrapf(errortypes.ErrUnknownRequest, "invalid message type %T, expected %T", msg, (*evmtypes.MsgEthereumTx)(nil))
}
allowUnprotectedTxs := evmParams.GetAllowUnprotectedTxs()
ethTx := msgEthTx.AsTransaction()
if !allowUnprotectedTxs && !ethTx.Protected() {
return ctx, errorsmod.Wrapf(
errortypes.ErrNotSupported,
"rejected unprotected Ethereum transaction. Please EIP155 sign your transaction to protect it against replay-attacks")
}
sender, err := signer.Sender(ethTx)
if err != nil {
return ctx, errorsmod.Wrapf(
errortypes.ErrorInvalidSigner,
"couldn't retrieve sender address from the ethereum transaction: %s",
err.Error(),
)
}
// set up the sender to the transaction field if not already
msgEthTx.From = sender.Hex()
}
return next(ctx, tx, simulate)
}