ante

package
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 Go to latest Published: Mar 30, 2022 License: LGPL-3.0 Imports: 31 Imported by: 0

Documentation

Overview

Package ante defines the SDK auth module's AnteHandler as well as an internal AnteHandler for an Ethereum transaction (i.e MsgEthereumTx).

During CheckTx, the transaction is passed through a series of pre-message execution validation checks such as signature and account verification in addition to minimum fees being checked. Otherwise, during DeliverTx, the transaction is simply passed to the EVM which will also perform the same series of checks. The distinction is made in CheckTx to prevent spam and DoS attacks.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func DefaultSigVerificationGasConsumer 

func DefaultSigVerificationGasConsumer(
	meter sdk.GasMeter, sig signing.SignatureV2, params authtypes.Params,
) error

DefaultSigVerificationGasConsumer is the default implementation of SignatureVerificationGasConsumer. It consumes gas for signature verification based upon the public key type. The cost is fetched from the given params and is matched by the concrete type.

func NewAnteHandler 

func NewAnteHandler(options HandlerOptions) sdk.AnteHandler

NewAnteHandler returns an ante handler responsible for attempting to route an Ethereum or SDK transaction to an internal ante handler for performing transaction-level processing (e.g. fee payment, signature verification) before being passed onto it's respective handler.

func Recover 

func Recover(logger tmlog.Logger, err *error)

func VerifySignature 

func VerifySignature(
	pubKey cryptotypes.PubKey,
	signerData authsigning.SignerData,
	sigData signing.SignatureData,
	_ authsigning.SignModeHandler,
	tx authsigning.Tx,
) error

VerifySignature verifies a transaction signature contained in SignatureData abstracting over different signing modes and single vs multi-signatures.

Types

type CanTransferDecorator 

type CanTransferDecorator struct {
	// contains filtered or unexported fields
}

CanTransferDecorator checks if the sender is allowed to transfer funds according to the EVM block context rules.

func NewCanTransferDecorator 

func NewCanTransferDecorator(evmKeeper EVMKeeper) CanTransferDecorator

NewCanTransferDecorator creates a new CanTransferDecorator instance.

func (CanTransferDecorator) AnteHandle 

func (ctd CanTransferDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error)

AnteHandle creates an EVM from the message and calls the BlockContext CanTransfer function to see if the address can execute the transaction.

type EVMKeeper 

type EVMKeeper interface {
	statedb.Keeper

	ChainID() *big.Int
	GetParams(ctx sdk.Context) evmtypes.Params
	NewEVM(ctx sdk.Context, msg core.Message, cfg *evmtypes.EVMConfig, tracer vm.EVMLogger, stateDB vm.StateDB) *vm.EVM
	DeductTxCostsFromUserBalance(
		ctx sdk.Context, msgEthTx evmtypes.MsgEthereumTx, txData evmtypes.TxData, denom string, homestead, istanbul, london bool,
	) (sdk.Coins, error)
	BaseFee(ctx sdk.Context, ethCfg *params.ChainConfig) *big.Int
	GetBalance(ctx sdk.Context, addr common.Address) *big.Int
	ResetTransientGasUsed(ctx sdk.Context)
}

EVMKeeper defines the expected keeper interface used on the Eth AnteHandler

type Eip712SigVerificationDecorator 

type Eip712SigVerificationDecorator struct {
	// contains filtered or unexported fields
}

Eip712SigVerificationDecorator Verify all signatures for a tx and return an error if any are invalid. Note, the Eip712SigVerificationDecorator decorator will not get executed on ReCheck.

CONTRACT: Pubkeys are set in context for all signers before this decorator runs CONTRACT: Tx must implement SigVerifiableTx interface

func NewEip712SigVerificationDecorator 

func NewEip712SigVerificationDecorator(ak evmtypes.AccountKeeper, signModeHandler authsigning.SignModeHandler) Eip712SigVerificationDecorator

NewEip712SigVerificationDecorator creates a new Eip712SigVerificationDecorator

func (Eip712SigVerificationDecorator) AnteHandle 

func (svd Eip712SigVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error)

AnteHandle handles validation of EIP712 signed cosmos txs. it is not run on RecheckTx

type EthAccountVerificationDecorator 

type EthAccountVerificationDecorator struct {
	// contains filtered or unexported fields
}

EthAccountVerificationDecorator validates an account balance checks

func NewEthAccountVerificationDecorator 

func NewEthAccountVerificationDecorator(ak evmtypes.AccountKeeper, bankKeeper evmtypes.BankKeeper, ek EVMKeeper) EthAccountVerificationDecorator

NewEthAccountVerificationDecorator creates a new EthAccountVerificationDecorator

func (EthAccountVerificationDecorator) AnteHandle 

func (avd EthAccountVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error)

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

type EthGasConsumeDecorator 

type EthGasConsumeDecorator struct {
	// contains filtered or unexported fields
}

EthGasConsumeDecorator validates enough intrinsic gas for the transaction and gas consumption.

func NewEthGasConsumeDecorator 

func NewEthGasConsumeDecorator(
	evmKeeper EVMKeeper,
	maxGasWanted uint64,
) EthGasConsumeDecorator

NewEthGasConsumeDecorator creates a new EthGasConsumeDecorator

func (EthGasConsumeDecorator) AnteHandle 

func (egcd EthGasConsumeDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error)

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 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 - sets the gas meter limit

type EthIncrementSenderSequenceDecorator 

type EthIncrementSenderSequenceDecorator struct {
	// contains filtered or unexported fields
}

EthIncrementSenderSequenceDecorator increments the sequence of the signers.

func NewEthIncrementSenderSequenceDecorator 

func NewEthIncrementSenderSequenceDecorator(ak evmtypes.AccountKeeper) EthIncrementSenderSequenceDecorator

NewEthIncrementSenderSequenceDecorator creates a new EthIncrementSenderSequenceDecorator.

func (EthIncrementSenderSequenceDecorator) AnteHandle 

func (issd EthIncrementSenderSequenceDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error)

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.

type EthMempoolFeeDecorator 

type EthMempoolFeeDecorator struct {
	// contains filtered or unexported fields
}

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

func NewEthMempoolFeeDecorator 

func NewEthMempoolFeeDecorator(ek EVMKeeper) EthMempoolFeeDecorator

func (EthMempoolFeeDecorator) AnteHandle 

func (mfd EthMempoolFeeDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error)

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. It only do the check if london hardfork not enabled or feemarket not enabled, because in that case feemarket will take over the task.

type EthSetupContextDecorator 

type EthSetupContextDecorator struct {
	// contains filtered or unexported fields
}

EthSetupContextDecorator is adapted from SetUpContextDecorator from cosmos-sdk, it ignores gas consumption by setting the gas meter to infinite

func NewEthSetUpContextDecorator 

func NewEthSetUpContextDecorator(evmKeeper EVMKeeper) EthSetupContextDecorator

func (EthSetupContextDecorator) AnteHandle 

func (esc EthSetupContextDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error)

type EthSigVerificationDecorator 

type EthSigVerificationDecorator struct {
	// contains filtered or unexported fields
}

EthSigVerificationDecorator validates an ethereum signatures

func NewEthSigVerificationDecorator 

func NewEthSigVerificationDecorator(ek EVMKeeper) EthSigVerificationDecorator

NewEthSigVerificationDecorator creates a new EthSigVerificationDecorator

func (EthSigVerificationDecorator) AnteHandle 

func (esvd EthSigVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error)

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.

type EthValidateBasicDecorator 

type EthValidateBasicDecorator struct {
	// contains filtered or unexported fields
}

EthValidateBasicDecorator is adapted from ValidateBasicDecorator from cosmos-sdk, it ignores ErrNoSignatures

func NewEthValidateBasicDecorator 

func NewEthValidateBasicDecorator(ek EVMKeeper) EthValidateBasicDecorator

NewEthValidateBasicDecorator creates a new EthValidateBasicDecorator

func (EthValidateBasicDecorator) AnteHandle 

func (vbd EthValidateBasicDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error)

AnteHandle handles basic validation of tx

type HandlerOptions 

type HandlerOptions struct {
	AccountKeeper   evmtypes.AccountKeeper
	BankKeeper      evmtypes.BankKeeper
	IBCKeeper       *ibckeeper.Keeper
	FeeMarketKeeper evmtypes.FeeMarketKeeper
	EvmKeeper       EVMKeeper
	FeegrantKeeper  ante.FeegrantKeeper
	SignModeHandler authsigning.SignModeHandler
	SigGasConsumer  func(meter sdk.GasMeter, sig signing.SignatureV2, params authtypes.Params) error
	MaxTxGasWanted  uint64
}

HandlerOptions extend the SDK's AnteHandler options by requiring the IBC channel keeper, EVM Keeper and Fee Market Keeper.

func (HandlerOptions) Validate 

func (options HandlerOptions) Validate() error

type RejectMessagesDecorator 

type RejectMessagesDecorator struct{}

RejectMessagesDecorator prevents invalid msg types from being executed

func (RejectMessagesDecorator) AnteHandle 

func (rmd RejectMessagesDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error)

AnteHandle rejects messages that requires ethereum-specific authentication. For example `MsgEthereumTx` requires fee to be deducted in the antehandler in order to perform the refund.

Source Files

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