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staker_tx_verification.go
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staker_tx_verification.go
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// Copyright (C) 2019-2022, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package executor
import (
"errors"
"fmt"
"time"
stdmath "math"
"github.com/ava-labs/avalanchego/database"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/utils/constants"
"github.com/ava-labs/avalanchego/utils/math"
"github.com/ava-labs/avalanchego/vms/components/avax"
"github.com/ava-labs/avalanchego/vms/platformvm/state"
"github.com/ava-labs/avalanchego/vms/platformvm/txs"
)
var (
errWeightTooSmall = errors.New("weight of this validator is too low")
errWeightTooLarge = errors.New("weight of this validator is too large")
errInsufficientDelegationFee = errors.New("staker charges an insufficient delegation fee")
errStakeTooShort = errors.New("staking period is too short")
errStakeTooLong = errors.New("staking period is too long")
errFlowCheckFailed = errors.New("flow check failed")
errFutureStakeTime = fmt.Errorf("staker is attempting to start staking more than %s ahead of the current chain time", MaxFutureStartTime)
errValidatorSubset = errors.New("all subnets' staking period must be a subset of the primary network")
errNotValidator = errors.New("isn't a current or pending validator")
errRemovePermissionlessValidator = errors.New("attempting to remove permissionless validator")
errStakeOverflow = errors.New("validator stake exceeds limit")
errOverDelegated = errors.New("validator would be over delegated")
errIsNotTransformSubnetTx = errors.New("is not a transform subnet tx")
errTimestampNotBeforeStartTime = errors.New("chain timestamp not before start time")
errDuplicateValidator = errors.New("duplicate validator")
errDelegateToPermissionedValidator = errors.New("delegation to permissioned validator")
errWrongStakedAssetID = errors.New("incorrect staked assetID")
)
// verifyAddValidatorTx carries out the validation for an AddValidatorTx.
// It returns the tx outputs that should be returned if this validator is not
// added to the staking set.
func verifyAddValidatorTx(
backend *Backend,
chainState state.Chain,
sTx *txs.Tx,
tx *txs.AddValidatorTx,
) (
[]*avax.TransferableOutput,
error,
) {
// Verify the tx is well-formed
if err := sTx.SyntacticVerify(backend.Ctx); err != nil {
return nil, err
}
duration := tx.Validator.Duration()
switch {
case tx.Validator.Wght < backend.Config.MinValidatorStake:
// Ensure validator is staking at least the minimum amount
return nil, errWeightTooSmall
case tx.Validator.Wght > backend.Config.MaxValidatorStake:
// Ensure validator isn't staking too much
return nil, errWeightTooLarge
case tx.DelegationShares < backend.Config.MinDelegationFee:
// Ensure the validator fee is at least the minimum amount
return nil, errInsufficientDelegationFee
case duration < backend.Config.MinStakeDuration:
// Ensure staking length is not too short
return nil, errStakeTooShort
case duration > backend.Config.MaxStakeDuration:
// Ensure staking length is not too long
return nil, errStakeTooLong
}
outs := make([]*avax.TransferableOutput, len(tx.Outs)+len(tx.StakeOuts))
copy(outs, tx.Outs)
copy(outs[len(tx.Outs):], tx.StakeOuts)
if !backend.Bootstrapped.GetValue() {
return outs, nil
}
currentTimestamp := chainState.GetTimestamp()
// Ensure the proposed validator starts after the current time
startTime := tx.StartTime()
if !currentTimestamp.Before(startTime) {
return nil, fmt.Errorf(
"%w: %s >= %s",
errTimestampNotBeforeStartTime,
currentTimestamp,
startTime,
)
}
_, err := GetValidator(chainState, constants.PrimaryNetworkID, tx.Validator.NodeID)
if err == nil {
return nil, fmt.Errorf(
"attempted to issue duplicate validation for %s",
tx.Validator.NodeID,
)
}
if err != database.ErrNotFound {
return nil, fmt.Errorf(
"failed to find whether %s is a primary network validator: %w",
tx.Validator.NodeID,
err,
)
}
// Verify the flowcheck
if err := backend.FlowChecker.VerifySpend(
tx,
chainState,
tx.Ins,
outs,
sTx.Creds,
map[ids.ID]uint64{
backend.Ctx.AVAXAssetID: backend.Config.AddPrimaryNetworkValidatorFee,
},
); err != nil {
return nil, fmt.Errorf("%w: %s", errFlowCheckFailed, err)
}
// Make sure the tx doesn't start too far in the future. This is done last
// to allow the verifier visitor to explicitly check for this error.
maxStartTime := currentTimestamp.Add(MaxFutureStartTime)
if startTime.After(maxStartTime) {
return nil, errFutureStakeTime
}
return outs, nil
}
// verifyAddSubnetValidatorTx carries out the validation for an
// AddSubnetValidatorTx.
func verifyAddSubnetValidatorTx(
backend *Backend,
chainState state.Chain,
sTx *txs.Tx,
tx *txs.AddSubnetValidatorTx,
) error {
// Verify the tx is well-formed
if err := sTx.SyntacticVerify(backend.Ctx); err != nil {
return err
}
duration := tx.Validator.Duration()
switch {
case duration < backend.Config.MinStakeDuration:
// Ensure staking length is not too short
return errStakeTooShort
case duration > backend.Config.MaxStakeDuration:
// Ensure staking length is not too long
return errStakeTooLong
}
if !backend.Bootstrapped.GetValue() {
return nil
}
currentTimestamp := chainState.GetTimestamp()
// Ensure the proposed validator starts after the current timestamp
validatorStartTime := tx.StartTime()
if !currentTimestamp.Before(validatorStartTime) {
return fmt.Errorf(
"%w: %s >= %s",
errTimestampNotBeforeStartTime,
currentTimestamp,
validatorStartTime,
)
}
_, err := GetValidator(chainState, tx.Validator.Subnet, tx.Validator.NodeID)
if err == nil {
return fmt.Errorf(
"attempted to issue duplicate subnet validation for %s",
tx.Validator.NodeID,
)
}
if err != database.ErrNotFound {
return fmt.Errorf(
"failed to find whether %s is a subnet validator: %w",
tx.Validator.NodeID,
err,
)
}
primaryNetworkValidator, err := GetValidator(chainState, constants.PrimaryNetworkID, tx.Validator.NodeID)
if err != nil {
return fmt.Errorf(
"failed to fetch the primary network validator for %s: %w",
tx.Validator.NodeID,
err,
)
}
// Ensure that the period this validator validates the specified subnet
// is a subset of the time they validate the primary network.
if !tx.Validator.BoundedBy(primaryNetworkValidator.StartTime, primaryNetworkValidator.EndTime) {
return errValidatorSubset
}
baseTxCreds, err := verifyPoASubnetAuthorization(backend, chainState, sTx, tx.Validator.Subnet, tx.SubnetAuth)
if err != nil {
return err
}
// Verify the flowcheck
if err := backend.FlowChecker.VerifySpend(
tx,
chainState,
tx.Ins,
tx.Outs,
baseTxCreds,
map[ids.ID]uint64{
backend.Ctx.AVAXAssetID: backend.Config.AddSubnetValidatorFee,
},
); err != nil {
return fmt.Errorf("%w: %s", errFlowCheckFailed, err)
}
// Make sure the tx doesn't start too far in the future. This is done last
// to allow the verifier visitor to explicitly check for this error.
maxStartTime := currentTimestamp.Add(MaxFutureStartTime)
if validatorStartTime.After(maxStartTime) {
return errFutureStakeTime
}
return nil
}
// Returns the representation of [tx.NodeID] validating [tx.Subnet].
// Returns true if [tx.NodeID] is a current validator of [tx.Subnet].
// Returns an error if the given tx is invalid.
// The transaction is valid if:
// * [tx.NodeID] is a current/pending PoA validator of [tx.Subnet].
// * [sTx]'s creds authorize it to spend the stated inputs.
// * [sTx]'s creds authorize it to remove a validator from [tx.Subnet].
// * The flow checker passes.
func removeSubnetValidatorValidation(
backend *Backend,
chainState state.Chain,
sTx *txs.Tx,
tx *txs.RemoveSubnetValidatorTx,
) (*state.Staker, bool, error) {
// Verify the tx is well-formed
if err := sTx.SyntacticVerify(backend.Ctx); err != nil {
return nil, false, err
}
isCurrentValidator := true
vdr, err := chainState.GetCurrentValidator(tx.Subnet, tx.NodeID)
if err == database.ErrNotFound {
vdr, err = chainState.GetPendingValidator(tx.Subnet, tx.NodeID)
isCurrentValidator = false
}
if err != nil {
// It isn't a current or pending validator.
return nil, false, fmt.Errorf(
"%s %w of %s: %s",
tx.NodeID,
errNotValidator,
tx.Subnet,
err,
)
}
if vdr.Priority != txs.SubnetPermissionedValidatorCurrentPriority &&
vdr.Priority != txs.SubnetPermissionedValidatorPendingPriority {
return nil, false, errRemovePermissionlessValidator
}
if !backend.Bootstrapped.GetValue() {
// Not bootstrapped yet -- don't need to do full verification.
return vdr, isCurrentValidator, nil
}
baseTxCreds, err := verifySubnetAuthorization(backend, chainState, sTx, tx.Subnet, tx.SubnetAuth)
if err != nil {
return nil, false, err
}
// Verify the flowcheck
if err := backend.FlowChecker.VerifySpend(
tx,
chainState,
tx.Ins,
tx.Outs,
baseTxCreds,
map[ids.ID]uint64{
backend.Ctx.AVAXAssetID: backend.Config.TxFee,
},
); err != nil {
return nil, false, fmt.Errorf("%w: %s", errFlowCheckFailed, err)
}
return vdr, isCurrentValidator, nil
}
// verifyAddDelegatorTx carries out the validation for an AddDelegatorTx.
// It returns the tx outputs that should be returned if this delegator is not
// added to the staking set.
func verifyAddDelegatorTx(
backend *Backend,
chainState state.Chain,
sTx *txs.Tx,
tx *txs.AddDelegatorTx,
) (
[]*avax.TransferableOutput,
error,
) {
// Verify the tx is well-formed
if err := sTx.SyntacticVerify(backend.Ctx); err != nil {
return nil, err
}
duration := tx.Validator.Duration()
switch {
case duration < backend.Config.MinStakeDuration:
// Ensure staking length is not too short
return nil, errStakeTooShort
case duration > backend.Config.MaxStakeDuration:
// Ensure staking length is not too long
return nil, errStakeTooLong
case tx.Validator.Wght < backend.Config.MinDelegatorStake:
// Ensure validator is staking at least the minimum amount
return nil, errWeightTooSmall
}
outs := make([]*avax.TransferableOutput, len(tx.Outs)+len(tx.StakeOuts))
copy(outs, tx.Outs)
copy(outs[len(tx.Outs):], tx.StakeOuts)
if !backend.Bootstrapped.GetValue() {
return outs, nil
}
currentTimestamp := chainState.GetTimestamp()
// Ensure the proposed validator starts after the current timestamp
validatorStartTime := tx.StartTime()
if !currentTimestamp.Before(validatorStartTime) {
return nil, fmt.Errorf(
"%w: %s >= %s",
errTimestampNotBeforeStartTime,
currentTimestamp,
validatorStartTime,
)
}
primaryNetworkValidator, err := GetValidator(chainState, constants.PrimaryNetworkID, tx.Validator.NodeID)
if err != nil {
return nil, fmt.Errorf(
"failed to fetch the primary network validator for %s: %w",
tx.Validator.NodeID,
err,
)
}
maximumWeight, err := math.Mul64(MaxValidatorWeightFactor, primaryNetworkValidator.Weight)
if err != nil {
return nil, errStakeOverflow
}
if backend.Config.IsApricotPhase3Activated(currentTimestamp) {
maximumWeight = math.Min(maximumWeight, backend.Config.MaxValidatorStake)
}
txID := sTx.ID()
newStaker, err := state.NewPendingStaker(txID, tx)
if err != nil {
return nil, err
}
canDelegate, err := canDelegate(chainState, primaryNetworkValidator, maximumWeight, newStaker)
if err != nil {
return nil, err
}
if !canDelegate {
return nil, errOverDelegated
}
// Verify the flowcheck
if err := backend.FlowChecker.VerifySpend(
tx,
chainState,
tx.Ins,
outs,
sTx.Creds,
map[ids.ID]uint64{
backend.Ctx.AVAXAssetID: backend.Config.AddPrimaryNetworkDelegatorFee,
},
); err != nil {
return nil, fmt.Errorf("%w: %s", errFlowCheckFailed, err)
}
// Make sure the tx doesn't start too far in the future. This is done last
// to allow the verifier visitor to explicitly check for this error.
maxStartTime := currentTimestamp.Add(MaxFutureStartTime)
if validatorStartTime.After(maxStartTime) {
return nil, errFutureStakeTime
}
return outs, nil
}
// verifyAddPermissionlessValidatorTx carries out the validation for an
// AddPermissionlessValidatorTx.
func verifyAddPermissionlessValidatorTx(
backend *Backend,
chainState state.Chain,
sTx *txs.Tx,
tx *txs.AddPermissionlessValidatorTx,
) error {
// Verify the tx is well-formed
if err := sTx.SyntacticVerify(backend.Ctx); err != nil {
return err
}
if !backend.Bootstrapped.GetValue() {
return nil
}
currentTimestamp := chainState.GetTimestamp()
// Ensure the proposed validator starts after the current time
startTime := tx.StartTime()
if !currentTimestamp.Before(startTime) {
return fmt.Errorf(
"%w: %s >= %s",
errTimestampNotBeforeStartTime,
currentTimestamp,
startTime,
)
}
validatorRules, err := getValidatorRules(backend, chainState, tx.Subnet)
if err != nil {
return err
}
duration := tx.Validator.Duration()
stakedAssetID := tx.StakeOuts[0].AssetID()
switch {
case tx.Validator.Wght < validatorRules.minValidatorStake:
// Ensure validator is staking at least the minimum amount
return errWeightTooSmall
case tx.Validator.Wght > validatorRules.maxValidatorStake:
// Ensure validator isn't staking too much
return errWeightTooLarge
case tx.DelegationShares < validatorRules.minDelegationFee:
// Ensure the validator fee is at least the minimum amount
return errInsufficientDelegationFee
case duration < validatorRules.minStakeDuration:
// Ensure staking length is not too short
return errStakeTooShort
case duration > validatorRules.maxStakeDuration:
// Ensure staking length is not too long
return errStakeTooLong
case stakedAssetID != validatorRules.assetID:
// Wrong assetID used
return fmt.Errorf(
"%w: %s != %s",
errWrongStakedAssetID,
validatorRules.assetID,
stakedAssetID,
)
}
_, err = GetValidator(chainState, tx.Subnet, tx.Validator.NodeID)
if err == nil {
return fmt.Errorf(
"%w: %s on %s",
errDuplicateValidator,
tx.Validator.NodeID,
tx.Subnet,
)
}
if err != database.ErrNotFound {
return fmt.Errorf(
"failed to find whether %s is a validator on %s: %w",
tx.Validator.NodeID,
tx.Subnet,
err,
)
}
var txFee uint64
if tx.Subnet != constants.PrimaryNetworkID {
primaryNetworkValidator, err := GetValidator(chainState, constants.PrimaryNetworkID, tx.Validator.NodeID)
if err != nil {
return fmt.Errorf(
"failed to fetch the primary network validator for %s: %w",
tx.Validator.NodeID,
err,
)
}
// Ensure that the period this validator validates the specified subnet
// is a subset of the time they validate the primary network.
if !tx.Validator.BoundedBy(primaryNetworkValidator.StartTime, primaryNetworkValidator.EndTime) {
return errValidatorSubset
}
txFee = backend.Config.AddSubnetValidatorFee
} else {
txFee = backend.Config.AddPrimaryNetworkValidatorFee
}
outs := make([]*avax.TransferableOutput, len(tx.Outs)+len(tx.StakeOuts))
copy(outs, tx.Outs)
copy(outs[len(tx.Outs):], tx.StakeOuts)
// Verify the flowcheck
if err := backend.FlowChecker.VerifySpend(
tx,
chainState,
tx.Ins,
outs,
sTx.Creds,
map[ids.ID]uint64{
backend.Ctx.AVAXAssetID: txFee,
},
); err != nil {
return fmt.Errorf("%w: %s", errFlowCheckFailed, err)
}
// Make sure the tx doesn't start too far in the future. This is done last
// to allow the verifier visitor to explicitly check for this error.
maxStartTime := currentTimestamp.Add(MaxFutureStartTime)
if startTime.After(maxStartTime) {
return errFutureStakeTime
}
return nil
}
type addValidatorRules struct {
assetID ids.ID
minValidatorStake uint64
maxValidatorStake uint64
minStakeDuration time.Duration
maxStakeDuration time.Duration
minDelegationFee uint32
}
func getValidatorRules(
backend *Backend,
chainState state.Chain,
subnetID ids.ID,
) (*addValidatorRules, error) {
if subnetID == constants.PrimaryNetworkID {
return &addValidatorRules{
assetID: backend.Ctx.AVAXAssetID,
minValidatorStake: backend.Config.MinValidatorStake,
maxValidatorStake: backend.Config.MaxValidatorStake,
minStakeDuration: backend.Config.MinStakeDuration,
maxStakeDuration: backend.Config.MaxStakeDuration,
minDelegationFee: backend.Config.MinDelegationFee,
}, nil
}
transformSubnetIntf, err := chainState.GetSubnetTransformation(subnetID)
if err != nil {
return nil, err
}
transformSubnet, ok := transformSubnetIntf.Unsigned.(*txs.TransformSubnetTx)
if !ok {
return nil, errIsNotTransformSubnetTx
}
return &addValidatorRules{
assetID: transformSubnet.AssetID,
minValidatorStake: transformSubnet.MinValidatorStake,
maxValidatorStake: transformSubnet.MaxValidatorStake,
minStakeDuration: time.Duration(transformSubnet.MinStakeDuration) * time.Second,
maxStakeDuration: time.Duration(transformSubnet.MaxStakeDuration) * time.Second,
minDelegationFee: transformSubnet.MinDelegationFee,
}, nil
}
// verifyAddPermissionlessDelegatorTx carries out the validation for an
// AddPermissionlessDelegatorTx.
func verifyAddPermissionlessDelegatorTx(
backend *Backend,
chainState state.Chain,
sTx *txs.Tx,
tx *txs.AddPermissionlessDelegatorTx,
) error {
// Verify the tx is well-formed
if err := sTx.SyntacticVerify(backend.Ctx); err != nil {
return err
}
if !backend.Bootstrapped.GetValue() {
return nil
}
currentTimestamp := chainState.GetTimestamp()
// Ensure the proposed validator starts after the current timestamp
startTime := tx.StartTime()
if !currentTimestamp.Before(startTime) {
return fmt.Errorf(
"chain timestamp (%s) not before validator's start time (%s)",
currentTimestamp,
startTime,
)
}
delegatorRules, err := getDelegatorRules(backend, chainState, tx.Subnet)
if err != nil {
return err
}
duration := tx.Validator.Duration()
stakedAssetID := tx.StakeOuts[0].AssetID()
switch {
case tx.Validator.Wght < delegatorRules.minDelegatorStake:
// Ensure delegator is staking at least the minimum amount
return errWeightTooSmall
case duration < delegatorRules.minStakeDuration:
// Ensure staking length is not too short
return errStakeTooShort
case duration > delegatorRules.maxStakeDuration:
// Ensure staking length is not too long
return errStakeTooLong
case stakedAssetID != delegatorRules.assetID:
// Wrong assetID used
return fmt.Errorf(
"%w: %s != %s",
errWrongStakedAssetID,
delegatorRules.assetID,
stakedAssetID,
)
}
validator, err := GetValidator(chainState, tx.Subnet, tx.Validator.NodeID)
if err != nil {
return fmt.Errorf(
"failed to fetch the validator for %s on %s: %w",
tx.Validator.NodeID,
tx.Subnet,
err,
)
}
maximumWeight, err := math.Mul64(
uint64(delegatorRules.maxValidatorWeightFactor),
validator.Weight,
)
if err != nil {
maximumWeight = stdmath.MaxUint64
}
maximumWeight = math.Min(maximumWeight, delegatorRules.maxValidatorStake)
txID := sTx.ID()
newStaker, err := state.NewPendingStaker(txID, tx)
if err != nil {
return err
}
canDelegate, err := canDelegate(chainState, validator, maximumWeight, newStaker)
if err != nil {
return err
}
if !canDelegate {
return errOverDelegated
}
outs := make([]*avax.TransferableOutput, len(tx.Outs)+len(tx.StakeOuts))
copy(outs, tx.Outs)
copy(outs[len(tx.Outs):], tx.StakeOuts)
var txFee uint64
if tx.Subnet != constants.PrimaryNetworkID {
// Invariant: Delegators must only be able to reference validator
// transactions that implement [txs.ValidatorTx]. All
// validator transactions implement this interface except the
// AddSubnetValidatorTx. AddSubnetValidatorTx is the only
// permissioned validator, so we verify this delegator is
// pointing to a permissionless validator.
if validator.Priority == txs.SubnetPermissionedValidatorCurrentPriority ||
validator.Priority == txs.SubnetPermissionedValidatorPendingPriority {
return errDelegateToPermissionedValidator
}
txFee = backend.Config.AddSubnetDelegatorFee
} else {
txFee = backend.Config.AddPrimaryNetworkDelegatorFee
}
// Verify the flowcheck
if err := backend.FlowChecker.VerifySpend(
tx,
chainState,
tx.Ins,
outs,
sTx.Creds,
map[ids.ID]uint64{
backend.Ctx.AVAXAssetID: txFee,
},
); err != nil {
return fmt.Errorf("%w: %s", errFlowCheckFailed, err)
}
// Make sure the tx doesn't start too far in the future. This is done last
// to allow the verifier visitor to explicitly check for this error.
maxStartTime := currentTimestamp.Add(MaxFutureStartTime)
if startTime.After(maxStartTime) {
return errFutureStakeTime
}
return nil
}
type addDelegatorRules struct {
assetID ids.ID
minDelegatorStake uint64
maxValidatorStake uint64
minStakeDuration time.Duration
maxStakeDuration time.Duration
maxValidatorWeightFactor byte
}
func getDelegatorRules(
backend *Backend,
chainState state.Chain,
subnetID ids.ID,
) (*addDelegatorRules, error) {
if subnetID == constants.PrimaryNetworkID {
return &addDelegatorRules{
assetID: backend.Ctx.AVAXAssetID,
minDelegatorStake: backend.Config.MinDelegatorStake,
maxValidatorStake: backend.Config.MaxValidatorStake,
minStakeDuration: backend.Config.MinStakeDuration,
maxStakeDuration: backend.Config.MaxStakeDuration,
maxValidatorWeightFactor: MaxValidatorWeightFactor,
}, nil
}
transformSubnetIntf, err := chainState.GetSubnetTransformation(subnetID)
if err != nil {
return nil, err
}
transformSubnet, ok := transformSubnetIntf.Unsigned.(*txs.TransformSubnetTx)
if !ok {
return nil, errIsNotTransformSubnetTx
}
return &addDelegatorRules{
assetID: transformSubnet.AssetID,
minDelegatorStake: transformSubnet.MinDelegatorStake,
maxValidatorStake: transformSubnet.MaxValidatorStake,
minStakeDuration: time.Duration(transformSubnet.MinStakeDuration) * time.Second,
maxStakeDuration: time.Duration(transformSubnet.MaxStakeDuration) * time.Second,
maxValidatorWeightFactor: transformSubnet.MaxValidatorWeightFactor,
}, nil
}