66 lines
2.3 KiB
Go
66 lines
2.3 KiB
Go
package ante
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import (
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"math/big"
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errorsmod "cosmossdk.io/errors"
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evmtypes "github.com/cerc-io/laconicd/x/evm/types"
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sdk "github.com/cosmos/cosmos-sdk/types"
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errortypes "github.com/cosmos/cosmos-sdk/types/errors"
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ethtypes "github.com/ethereum/go-ethereum/core/types"
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)
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// EthSigVerificationDecorator validates an ethereum signatures
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type EthSigVerificationDecorator struct {
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evmKeeper EVMKeeper
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}
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// NewEthSigVerificationDecorator creates a new EthSigVerificationDecorator
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func NewEthSigVerificationDecorator(ek EVMKeeper) EthSigVerificationDecorator {
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return EthSigVerificationDecorator{
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evmKeeper: ek,
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}
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}
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// AnteHandle validates checks that the registered chain id is the same as the one on the message, and
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// that the signer address matches the one defined on the message.
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// It's not skipped for RecheckTx, because it set `From` address which is critical from other ante handler to work.
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// Failure in RecheckTx will prevent tx to be included into block, especially when CheckTx succeed, in which case user
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// won't see the error message.
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func (esvd EthSigVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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chainID := esvd.evmKeeper.ChainID()
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chainCfg := esvd.evmKeeper.GetChainConfig(ctx)
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ethCfg := chainCfg.EthereumConfig(chainID)
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blockNum := big.NewInt(ctx.BlockHeight())
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signer := ethtypes.MakeSigner(ethCfg, blockNum)
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for _, msg := range tx.GetMsgs() {
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msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, errorsmod.Wrapf(errortypes.ErrUnknownRequest, "invalid message type %T, expected %T", msg, (*evmtypes.MsgEthereumTx)(nil))
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}
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allowUnprotectedTxs := esvd.evmKeeper.GetAllowUnprotectedTxs(ctx)
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ethTx := msgEthTx.AsTransaction()
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if !allowUnprotectedTxs && !ethTx.Protected() {
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return ctx, errorsmod.Wrapf(
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errortypes.ErrNotSupported,
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"rejected unprotected Ethereum transaction. Please EIP155 sign your transaction to protect it against replay-attacks")
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}
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sender, err := signer.Sender(ethTx)
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if err != nil {
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return ctx, errorsmod.Wrapf(
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errortypes.ErrorInvalidSigner,
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"couldn't retrieve sender address from the ethereum transaction: %s",
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err.Error(),
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)
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}
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// set up the sender to the transaction field if not already
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msgEthTx.From = sender.Hex()
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}
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return next(ctx, tx, simulate)
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}
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