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preprocess.go
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preprocess.go
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package ante
import (
"encoding/hex"
"errors"
"fmt"
"math/big"
"github.com/btcsuite/btcd/btcec"
"github.com/cosmos/cosmos-sdk/crypto/keys/secp256k1"
cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkacltypes "github.com/cosmos/cosmos-sdk/types/accesscontrol"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
accountkeeper "github.com/cosmos/cosmos-sdk/x/auth/keeper"
authsigning "github.com/cosmos/cosmos-sdk/x/auth/signing"
authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
"github.com/ethereum/go-ethereum/common"
ethtypes "github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/params"
"github.com/sei-protocol/sei-chain/app/antedecorators"
"github.com/sei-protocol/sei-chain/utils"
"github.com/sei-protocol/sei-chain/x/evm/derived"
evmkeeper "github.com/sei-protocol/sei-chain/x/evm/keeper"
evmtypes "github.com/sei-protocol/sei-chain/x/evm/types"
"github.com/sei-protocol/sei-chain/x/evm/types/ethtx"
)
// Accounts need to have at least 1Sei to force association. Note that account won't be charged.
const BalanceThreshold uint64 = 1000000
var BigBalanceThreshold *big.Int = new(big.Int).SetUint64(BalanceThreshold)
var BigBalanceThresholdMinus1 *big.Int = new(big.Int).SetUint64(BalanceThreshold - 1)
var SignerMap = map[derived.SignerVersion]func(*big.Int) ethtypes.Signer{
derived.London: ethtypes.NewLondonSigner,
derived.Cancun: ethtypes.NewCancunSigner,
}
var AllowedTxTypes = map[derived.SignerVersion][]uint8{
derived.London: {ethtypes.LegacyTxType, ethtypes.AccessListTxType, ethtypes.DynamicFeeTxType},
derived.Cancun: {ethtypes.LegacyTxType, ethtypes.AccessListTxType, ethtypes.DynamicFeeTxType, ethtypes.BlobTxType},
}
type EVMPreprocessDecorator struct {
evmKeeper *evmkeeper.Keeper
accountKeeper *accountkeeper.AccountKeeper
}
func NewEVMPreprocessDecorator(evmKeeper *evmkeeper.Keeper, accountKeeper *accountkeeper.AccountKeeper) *EVMPreprocessDecorator {
return &EVMPreprocessDecorator{evmKeeper: evmKeeper, accountKeeper: accountKeeper}
}
//nolint:revive
func (p *EVMPreprocessDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
msg := evmtypes.MustGetEVMTransactionMessage(tx)
if err := Preprocess(ctx, msg); err != nil {
return ctx, err
}
// use infinite gas meter for EVM transaction because EVM handles gas checking from within
ctx = ctx.WithGasMeter(sdk.NewInfiniteGasMeterWithMultiplier(ctx))
derived := msg.Derived
seiAddr := derived.SenderSeiAddr
evmAddr := derived.SenderEVMAddr
ctx.EventManager().EmitEvent(sdk.NewEvent(evmtypes.EventTypeSigner,
sdk.NewAttribute(evmtypes.AttributeKeyEvmAddress, evmAddr.Hex()),
sdk.NewAttribute(evmtypes.AttributeKeySeiAddress, seiAddr.String())))
pubkey := derived.PubKey
isAssociateTx := derived.IsAssociate
_, isAssociated := p.evmKeeper.GetEVMAddress(ctx, seiAddr)
if isAssociateTx && isAssociated {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "account already has association set")
} else if isAssociateTx {
// check if the account has enough balance (without charging)
if !p.IsAccountBalancePositive(ctx, seiAddr, evmAddr) {
return ctx, sdkerrors.Wrap(sdkerrors.ErrInsufficientFunds, "account needs to have at least 1 wei to force association")
}
if err := p.AssociateAddresses(ctx, seiAddr, evmAddr, pubkey); err != nil {
return ctx, err
}
return ctx.WithPriority(antedecorators.EVMAssociatePriority), nil // short-circuit without calling next
} else if isAssociated {
// noop; for readability
} else {
// not associatedTx and not already associated
if err := p.AssociateAddresses(ctx, seiAddr, evmAddr, pubkey); err != nil {
return ctx, err
}
if p.evmKeeper.EthReplayConfig.Enabled {
p.evmKeeper.PrepareReplayedAddr(ctx, evmAddr)
}
}
return next(ctx, tx, simulate)
}
func (p *EVMPreprocessDecorator) AssociateAddresses(ctx sdk.Context, seiAddr sdk.AccAddress, evmAddr common.Address, pubkey cryptotypes.PubKey) error {
p.evmKeeper.SetAddressMapping(ctx, seiAddr, evmAddr)
if acc := p.accountKeeper.GetAccount(ctx, seiAddr); acc.GetPubKey() == nil {
if err := acc.SetPubKey(pubkey); err != nil {
return err
}
p.accountKeeper.SetAccount(ctx, acc)
}
return migrateBalance(ctx, p.evmKeeper, evmAddr, seiAddr)
}
func (p *EVMPreprocessDecorator) IsAccountBalancePositive(ctx sdk.Context, seiAddr sdk.AccAddress, evmAddr common.Address) bool {
baseDenom := p.evmKeeper.GetBaseDenom(ctx)
if amt := p.evmKeeper.BankKeeper().GetBalance(ctx, seiAddr, baseDenom).Amount; amt.IsPositive() {
return true
}
if amt := p.evmKeeper.BankKeeper().GetBalance(ctx, sdk.AccAddress(evmAddr[:]), baseDenom).Amount; amt.IsPositive() {
return true
}
if amt := p.evmKeeper.BankKeeper().GetWeiBalance(ctx, seiAddr); amt.IsPositive() {
return true
}
return p.evmKeeper.BankKeeper().GetWeiBalance(ctx, sdk.AccAddress(evmAddr[:])).IsPositive()
}
// stateless
func Preprocess(ctx sdk.Context, msgEVMTransaction *evmtypes.MsgEVMTransaction) error {
if msgEVMTransaction.Derived != nil {
if msgEVMTransaction.Derived.PubKey == nil {
// this means the message has `Derived` set from the outside, in which case we should reject
return sdkerrors.ErrInvalidPubKey
}
// already preprocessed
return nil
}
txData, err := evmtypes.UnpackTxData(msgEVMTransaction.Data)
if err != nil {
return err
}
if atx, ok := txData.(*ethtx.AssociateTx); ok {
V, R, S := atx.GetRawSignatureValues()
V = new(big.Int).Add(V, utils.Big27)
// Hash custom message passed in
customMessageHash := crypto.Keccak256Hash([]byte(atx.CustomMessage))
evmAddr, seiAddr, pubkey, err := getAddresses(V, R, S, customMessageHash)
if err != nil {
return err
}
msgEVMTransaction.Derived = &derived.Derived{
SenderEVMAddr: evmAddr,
SenderSeiAddr: seiAddr,
PubKey: &secp256k1.PubKey{Key: pubkey.Bytes()},
Version: derived.Cancun,
IsAssociate: true,
}
return nil
}
ethTx := ethtypes.NewTx(txData.AsEthereumData())
chainID := ethTx.ChainId()
chainCfg := evmtypes.DefaultChainConfig()
ethCfg := chainCfg.EthereumConfig(chainID)
version := GetVersion(ctx, ethCfg)
signer := SignerMap[version](chainID)
if !isTxTypeAllowed(version, ethTx.Type()) {
return ethtypes.ErrInvalidChainId
}
var txHash common.Hash
V, R, S := ethTx.RawSignatureValues()
if ethTx.Protected() {
V = AdjustV(V, ethTx.Type(), ethCfg.ChainID)
txHash = signer.Hash(ethTx)
} else {
txHash = ethtypes.FrontierSigner{}.Hash(ethTx)
}
evmAddr, seiAddr, seiPubkey, err := getAddresses(V, R, S, txHash)
if err != nil {
return err
}
msgEVMTransaction.Derived = &derived.Derived{
SenderEVMAddr: evmAddr,
SenderSeiAddr: seiAddr,
PubKey: &secp256k1.PubKey{Key: seiPubkey.Bytes()},
Version: version,
IsAssociate: false,
}
return nil
}
func (p *EVMPreprocessDecorator) AnteDeps(txDeps []sdkacltypes.AccessOperation, tx sdk.Tx, txIndex int, next sdk.AnteDepGenerator) (newTxDeps []sdkacltypes.AccessOperation, err error) {
msg := evmtypes.MustGetEVMTransactionMessage(tx)
return next(append(txDeps, sdkacltypes.AccessOperation{
AccessType: sdkacltypes.AccessType_READ,
ResourceType: sdkacltypes.ResourceType_KV_EVM_S2E,
IdentifierTemplate: hex.EncodeToString(evmtypes.SeiAddressToEVMAddressKey(msg.Derived.SenderSeiAddr)),
}, sdkacltypes.AccessOperation{
AccessType: sdkacltypes.AccessType_WRITE,
ResourceType: sdkacltypes.ResourceType_KV_EVM_S2E,
IdentifierTemplate: hex.EncodeToString(evmtypes.SeiAddressToEVMAddressKey(msg.Derived.SenderSeiAddr)),
}, sdkacltypes.AccessOperation{
AccessType: sdkacltypes.AccessType_WRITE,
ResourceType: sdkacltypes.ResourceType_KV_EVM_E2S,
IdentifierTemplate: hex.EncodeToString(evmtypes.EVMAddressToSeiAddressKey(msg.Derived.SenderEVMAddr)),
}, sdkacltypes.AccessOperation{
AccessType: sdkacltypes.AccessType_READ,
ResourceType: sdkacltypes.ResourceType_KV_BANK_BALANCES,
IdentifierTemplate: hex.EncodeToString(banktypes.CreateAccountBalancesPrefix(msg.Derived.SenderSeiAddr)),
}, sdkacltypes.AccessOperation{
AccessType: sdkacltypes.AccessType_WRITE,
ResourceType: sdkacltypes.ResourceType_KV_BANK_BALANCES,
IdentifierTemplate: hex.EncodeToString(banktypes.CreateAccountBalancesPrefix(msg.Derived.SenderSeiAddr)),
}, sdkacltypes.AccessOperation{
AccessType: sdkacltypes.AccessType_READ,
ResourceType: sdkacltypes.ResourceType_KV_BANK_BALANCES,
IdentifierTemplate: hex.EncodeToString(banktypes.CreateAccountBalancesPrefix(msg.Derived.SenderEVMAddr[:])),
}, sdkacltypes.AccessOperation{
AccessType: sdkacltypes.AccessType_WRITE,
ResourceType: sdkacltypes.ResourceType_KV_BANK_BALANCES,
IdentifierTemplate: hex.EncodeToString(banktypes.CreateAccountBalancesPrefix(msg.Derived.SenderEVMAddr[:])),
}, sdkacltypes.AccessOperation{
AccessType: sdkacltypes.AccessType_READ,
ResourceType: sdkacltypes.ResourceType_KV_AUTH_ADDRESS_STORE,
IdentifierTemplate: hex.EncodeToString(authtypes.AddressStoreKey(msg.Derived.SenderSeiAddr)),
}, sdkacltypes.AccessOperation{
AccessType: sdkacltypes.AccessType_WRITE,
ResourceType: sdkacltypes.ResourceType_KV_AUTH_ADDRESS_STORE,
IdentifierTemplate: hex.EncodeToString(authtypes.AddressStoreKey(msg.Derived.SenderSeiAddr)),
}, sdkacltypes.AccessOperation{
AccessType: sdkacltypes.AccessType_READ,
ResourceType: sdkacltypes.ResourceType_KV_AUTH_ADDRESS_STORE,
IdentifierTemplate: hex.EncodeToString(authtypes.AddressStoreKey(msg.Derived.SenderEVMAddr[:])),
}, sdkacltypes.AccessOperation{
AccessType: sdkacltypes.AccessType_WRITE,
ResourceType: sdkacltypes.ResourceType_KV_AUTH_ADDRESS_STORE,
IdentifierTemplate: hex.EncodeToString(authtypes.AddressStoreKey(msg.Derived.SenderEVMAddr[:])),
}, sdkacltypes.AccessOperation{
AccessType: sdkacltypes.AccessType_READ,
ResourceType: sdkacltypes.ResourceType_KV_EVM_NONCE,
IdentifierTemplate: hex.EncodeToString(append(evmtypes.NonceKeyPrefix, msg.Derived.SenderEVMAddr[:]...)),
}), tx, txIndex)
}
func getAddresses(V *big.Int, R *big.Int, S *big.Int, data common.Hash) (common.Address, sdk.AccAddress, cryptotypes.PubKey, error) {
pubkey, err := recoverPubkey(data, R, S, V, true)
if err != nil {
return common.Address{}, sdk.AccAddress{}, nil, err
}
evmAddr, err := pubkeyToEVMAddress(pubkey)
if err != nil {
return common.Address{}, sdk.AccAddress{}, nil, err
}
seiPubkey := pubkeyBytesToSeiPubKey(pubkey)
seiAddr := sdk.AccAddress(seiPubkey.Address())
return evmAddr, seiAddr, &seiPubkey, nil
}
// first half of go-ethereum/core/types/transaction_signing.go:recoverPlain
func recoverPubkey(sighash common.Hash, R, S, Vb *big.Int, homestead bool) ([]byte, error) {
if Vb.BitLen() > 8 {
return []byte{}, ethtypes.ErrInvalidSig
}
V := byte(Vb.Uint64() - 27)
if !crypto.ValidateSignatureValues(V, R, S, homestead) {
return []byte{}, ethtypes.ErrInvalidSig
}
// encode the signature in uncompressed format
r, s := R.Bytes(), S.Bytes()
sig := make([]byte, crypto.SignatureLength)
copy(sig[32-len(r):32], r)
copy(sig[64-len(s):64], s)
sig[64] = V
// recover the public key from the signature
return crypto.Ecrecover(sighash[:], sig)
}
// second half of go-ethereum/core/types/transaction_signing.go:recoverPlain
func pubkeyToEVMAddress(pub []byte) (common.Address, error) {
if len(pub) == 0 || pub[0] != 4 {
return common.Address{}, errors.New("invalid public key")
}
var addr common.Address
copy(addr[:], crypto.Keccak256(pub[1:])[12:])
return addr, nil
}
func pubkeyBytesToSeiPubKey(pub []byte) secp256k1.PubKey {
pubKey, _ := crypto.UnmarshalPubkey(pub)
pubkeyObj := (*btcec.PublicKey)(pubKey)
return secp256k1.PubKey{Key: pubkeyObj.SerializeCompressed()}
}
func isTxTypeAllowed(version derived.SignerVersion, txType uint8) bool {
for _, t := range AllowedTxTypes[version] {
if t == txType {
return true
}
}
return false
}
func AdjustV(V *big.Int, txType uint8, chainID *big.Int) *big.Int {
// Non-legacy TX always needs to be bumped by 27
if txType != ethtypes.LegacyTxType {
return new(big.Int).Add(V, utils.Big27)
}
// legacy TX needs to be adjusted based on chainID
V = new(big.Int).Sub(V, new(big.Int).Mul(chainID, utils.Big2))
return V.Sub(V, utils.Big8)
}
func GetVersion(ctx sdk.Context, ethCfg *params.ChainConfig) derived.SignerVersion {
blockNum := big.NewInt(ctx.BlockHeight())
ts := uint64(ctx.BlockTime().Unix())
switch {
case ethCfg.IsCancun(blockNum, ts):
return derived.Cancun
default:
return derived.London
}
}
type EVMAddressDecorator struct {
evmKeeper *evmkeeper.Keeper
accountKeeper *accountkeeper.AccountKeeper
}
func NewEVMAddressDecorator(evmKeeper *evmkeeper.Keeper, accountKeeper *accountkeeper.AccountKeeper) *EVMAddressDecorator {
return &EVMAddressDecorator{evmKeeper: evmKeeper, accountKeeper: accountKeeper}
}
func migrateBalance(ctx sdk.Context, evmKeeper *evmkeeper.Keeper, evmAddr common.Address, seiAddr sdk.AccAddress) error {
castAddr := sdk.AccAddress(evmAddr[:])
castAddrBalances := evmKeeper.BankKeeper().GetAllBalances(ctx, castAddr)
if !castAddrBalances.IsZero() {
if err := evmKeeper.BankKeeper().SendCoins(ctx, castAddr, seiAddr, castAddrBalances); err != nil {
return err
}
}
castAddrWei := evmKeeper.BankKeeper().GetWeiBalance(ctx, castAddr)
if !castAddrWei.IsZero() {
if err := evmKeeper.BankKeeper().SendCoinsAndWei(ctx, castAddr, seiAddr, sdk.ZeroInt(), castAddrWei); err != nil {
return err
}
}
evmKeeper.AccountKeeper().RemoveAccount(ctx, authtypes.NewBaseAccountWithAddress(castAddr))
return nil
}
//nolint:revive
func (p *EVMAddressDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
sigTx, ok := tx.(authsigning.SigVerifiableTx)
if !ok {
return ctx, sdkerrors.Wrap(sdkerrors.ErrTxDecode, "invalid tx type")
}
signers := sigTx.GetSigners()
for _, signer := range signers {
if evmAddr, associated := p.evmKeeper.GetEVMAddress(ctx, signer); associated {
ctx.EventManager().EmitEvent(sdk.NewEvent(evmtypes.EventTypeSigner,
sdk.NewAttribute(evmtypes.AttributeKeyEvmAddress, evmAddr.Hex()),
sdk.NewAttribute(evmtypes.AttributeKeySeiAddress, signer.String())))
continue
}
acc := p.accountKeeper.GetAccount(ctx, signer)
if acc.GetPubKey() == nil {
ctx.Logger().Error(fmt.Sprintf("missing pubkey for %s", signer.String()))
continue
}
pk, err := btcec.ParsePubKey(acc.GetPubKey().Bytes(), btcec.S256())
if err != nil {
ctx.Logger().Debug(fmt.Sprintf("failed to parse pubkey for %s, likely due to the fact that it isn't on secp256k1 curve", acc.GetPubKey()), "err", err)
continue
}
evmAddr, err := pubkeyToEVMAddress(pk.SerializeUncompressed())
if err != nil {
ctx.Logger().Error(fmt.Sprintf("failed to get EVM address from pubkey due to %s", err))
continue
}
ctx.EventManager().EmitEvent(sdk.NewEvent(evmtypes.EventTypeSigner,
sdk.NewAttribute(evmtypes.AttributeKeyEvmAddress, evmAddr.Hex()),
sdk.NewAttribute(evmtypes.AttributeKeySeiAddress, signer.String())))
p.evmKeeper.SetAddressMapping(ctx, signer, evmAddr)
if err := migrateBalance(ctx, p.evmKeeper, evmAddr, signer); err != nil {
ctx.Logger().Error(fmt.Sprintf("failed to migrate EVM address balance (%s) %s", evmAddr.Hex(), err))
return ctx, err
}
}
return next(ctx, tx, simulate)
}