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# beacon_chain
# Copyright (c) 2018-2023 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [].}
import
std/[tables, json, streams, sequtils, uri],
chronos, chronicles, metrics, eth/async_utils,
json_serialization/std/net,
presto, presto/client,
../spec/[keystore, signatures, helpers, crypto],
../spec/datatypes/[phase0, altair],
../spec/eth2_apis/[rest_types, eth2_rest_serialization,
rest_remote_signer_calls],
../filepath,
./slashing_protection
export
streams, keystore, phase0, altair, tables, uri, crypto,
rest_types, eth2_rest_serialization, rest_remote_signer_calls,
slashing_protection
const
WEB3_SIGNER_DELAY_TOLERANCE = 3.seconds
declareGauge validators,
"Number of validators attached to the beacon node"
logScope: topics = "val_pool"
type
ValidatorKind* {.pure.} = enum
Local, Remote
ValidatorConnection* = RestClientRef
ValidatorAndIndex* = object
index*: ValidatorIndex
validator*: Validator
AttachedValidator* = ref object
data*: KeystoreData
case kind*: ValidatorKind
of ValidatorKind.Local:
discard
of ValidatorKind.Remote:
clients*: seq[(RestClientRef, RemoteSignerInfo)]
threshold*: uint32
updated*: bool
index*: Opt[ValidatorIndex]
## Validator index which is assigned after the eth1 deposit has been
## processed - this index is valid across all eth2 forks for fork depths
## up to ETH1_FOLLOW_DISTANCE - we don't support changing indices.
activationEpoch*: Epoch
## Epoch when validator activated - this happens at the time or some time
## after the validator index has been assigned depending on how many
## validators are in the activation queue - this is the first epoch that
## the validator starts performing duties
# Cache the latest slot signature - the slot signature is used to determine
# if the validator will be aggregating (in the near future)
slotSignature*: Opt[tuple[slot: Slot, signature: ValidatorSig]]
# For the external payload builder; each epoch, the external payload
# builder should be informed of current validators
externalBuilderRegistration*: Opt[SignedValidatorRegistrationV1]
doppelCheck*: Opt[Epoch]
## The epoch where doppelganger detection last performed a check
doppelActivity*: Opt[Epoch]
## The last time we attempted to perform a duty with this validator
lastWarning*: Opt[Slot]
SignResponse* = Web3SignerDataResponse
SignatureResult* = Result[ValidatorSig, string]
SyncCommitteeMessageResult* = Result[SyncCommitteeMessage, string]
ValidatorPool* = object
validators*: Table[ValidatorPubKey, AttachedValidator]
slashingProtection*: SlashingProtectionDB
doppelgangerDetectionEnabled*: bool
template pubkey*(v: AttachedValidator): ValidatorPubKey =
v.data.pubkey
func shortLog*(v: AttachedValidator): string =
case v.kind
of ValidatorKind.Local:
shortLog(v.pubkey)
of ValidatorKind.Remote:
shortLog(v.pubkey)
func init*(T: type ValidatorPool,
slashingProtectionDB: SlashingProtectionDB,
doppelgangerDetectionEnabled: bool): T =
## Initialize the validator pool and the slashing protection service
## `genesis_validators_root` is used as an unique ID for the
## blockchain
## `backend` is the KeyValue Store backend
T(
slashingProtection: slashingProtectionDB,
doppelgangerDetectionEnabled: doppelgangerDetectionEnabled)
template count*(pool: ValidatorPool): int =
len(pool.validators)
proc addLocalValidator(
pool: var ValidatorPool, keystore: KeystoreData,
feeRecipient: Eth1Address, gasLimit: uint64): AttachedValidator =
doAssert keystore.kind == KeystoreKind.Local
let v = AttachedValidator(
kind: ValidatorKind.Local,
data: keystore,
externalBuilderRegistration: Opt.none SignedValidatorRegistrationV1,
activationEpoch: FAR_FUTURE_EPOCH
)
pool.validators[v.pubkey] = v
# Fee recipient may change after startup, but we log the initial value here
notice "Local validator attached",
pubkey = v.pubkey,
validator = shortLog(v),
initial_fee_recipient = feeRecipient.toHex(),
initial_gas_limit = gasLimit
validators.set(pool.count().int64)
v
proc addRemoteValidator(pool: var ValidatorPool, keystore: KeystoreData,
clients: seq[(RestClientRef, RemoteSignerInfo)],
feeRecipient: Eth1Address,
gasLimit: uint64): AttachedValidator =
doAssert keystore.kind == KeystoreKind.Remote
let v = AttachedValidator(
kind: ValidatorKind.Remote,
data: keystore,
clients: clients,
externalBuilderRegistration: Opt.none SignedValidatorRegistrationV1,
activationEpoch: FAR_FUTURE_EPOCH,
)
pool.validators[v.pubkey] = v
notice "Remote validator attached",
pubkey = v.pubkey,
validator = shortLog(v),
remote_signer = $keystore.remotes,
initial_fee_recipient = feeRecipient.toHex(),
initial_gas_limit = gasLimit
validators.set(pool.count().int64)
v
proc addRemoteValidator(pool: var ValidatorPool,
keystore: KeystoreData,
feeRecipient: Eth1Address,
gasLimit: uint64): AttachedValidator =
let
httpFlags =
if RemoteKeystoreFlag.IgnoreSSLVerification in keystore.flags:
{HttpClientFlag.NoVerifyHost, HttpClientFlag.NoVerifyServerName}
else:
{}
prestoFlags = {RestClientFlag.CommaSeparatedArray}
clients =
block:
var res: seq[(RestClientRef, RemoteSignerInfo)]
for remote in keystore.remotes:
let client = RestClientRef.new($remote.url, prestoFlags, httpFlags)
if client.isErr():
# TODO keep trying in case of temporary network failure
warn "Unable to resolve distributed signer address",
remote_url = $remote.url, validator = $remote.pubkey
else:
res.add((client.get(), remote))
res
pool.addRemoteValidator(keystore, clients, feeRecipient, gasLimit)
proc addValidator*(pool: var ValidatorPool,
keystore: KeystoreData,
feeRecipient: Eth1Address,
gasLimit: uint64): AttachedValidator =
pool.validators.withValue(keystore.pubkey, v):
notice "Adding already-known validator", validator = shortLog(v[])
return v[]
case keystore.kind
of KeystoreKind.Local:
pool.addLocalValidator(keystore, feeRecipient, gasLimit)
of KeystoreKind.Remote:
pool.addRemoteValidator(keystore, feeRecipient, gasLimit)
proc getValidator*(pool: ValidatorPool,
validatorKey: ValidatorPubKey): Opt[AttachedValidator] =
let v = pool.validators.getOrDefault(validatorKey)
if v == nil: Opt.none(AttachedValidator) else: Opt.some(v)
proc contains*(pool: ValidatorPool, pubkey: ValidatorPubKey): bool =
## Returns ``true`` if validator with key ``pubkey`` present in ``pool``.
pool.validators.contains(pubkey)
proc removeValidator*(pool: var ValidatorPool, pubkey: ValidatorPubKey) =
## Delete validator with public key ``pubkey`` from ``pool``.
let validator = pool.validators.getOrDefault(pubkey)
if not(isNil(validator)):
pool.validators.del(pubkey)
case validator.kind
of ValidatorKind.Local:
notice "Local validator detached", pubkey, validator = shortLog(validator)
of ValidatorKind.Remote:
notice "Remote validator detached", pubkey,
validator = shortLog(validator)
validators.set(pool.count().int64)
proc needsUpdate*(validator: AttachedValidator): bool =
validator.index.isNone() or validator.activationEpoch == FAR_FUTURE_EPOCH
proc updateValidator*(
validator: AttachedValidator, validatorData: Opt[ValidatorAndIndex]) =
defer: validator.updated = true
let
data = validatorData.valueOr:
if not validator.updated:
notice "Validator deposit not yet processed, monitoring",
pubkey = validator.pubkey
return
index = data.index
activationEpoch = data.validator.activation_epoch
## Update activation information for a validator
if validator.index != Opt.some data.index:
validator.index = Opt.some data.index
if validator.activationEpoch != data.validator.activation_epoch:
# In theory, activation epoch could change but that's rare enough that it
# shouldn't practically matter for the current uses
info "Validator activation updated",
validator = shortLog(validator), pubkey = validator.pubkey, index,
activationEpoch
validator.activationEpoch = activationEpoch
proc close*(pool: var ValidatorPool) =
## Unlock and close all validator keystore's files managed by ``pool``.
for validator in pool.validators.values():
let res = validator.data.handle.closeLockedFile()
if res.isErr():
notice "Could not unlock validator's keystore file",
pubkey = validator.pubkey, validator = shortLog(validator)
iterator publicKeys*(pool: ValidatorPool): ValidatorPubKey =
for item in pool.validators.keys():
yield item
iterator indices*(pool: ValidatorPool): ValidatorIndex =
for item in pool.validators.values():
if item.index.isSome():
yield item.index.get()
iterator items*(pool: ValidatorPool): AttachedValidator =
for item in pool.validators.values():
yield item
proc doppelgangerChecked*(validator: AttachedValidator, epoch: Epoch) =
## Call when the validator was checked for activity in the given epoch
if validator.doppelCheck.isNone():
debug "Doppelganger first check",
validator = shortLog(validator), epoch
elif validator.doppelCheck.get() + 1 notin [epoch, epoch + 1]:
debug "Doppelganger stale check",
validator = shortLog(validator),
checked = validator.doppelCheck.get(), epoch
validator.doppelCheck = Opt.some epoch
proc doppelgangerActivity*(validator: AttachedValidator, epoch: Epoch) =
## Call when we performed a doppelganger-monitored activity in the epoch
if validator.doppelActivity.isNone():
debug "Doppelganger first activity",
validator = shortLog(validator), epoch
elif validator.doppelActivity.get() + 1 notin [epoch, epoch + 1]:
debug "Doppelganger stale activity",
validator = shortLog(validator),
checked = validator.doppelActivity.get(), epoch
validator.doppelActivity = Opt.some epoch
func triggersDoppelganger*(v: AttachedValidator, epoch: Epoch): bool =
## Returns true iff we have proof that an activity in the given epoch
## triggers doppelganger detection: this means the network was active for this
## validator during the given epoch (via doppelgangerChecked) but the activity
## did not originate from this instance.
if v.doppelActivity.isSome() and v.doppelActivity.get() >= epoch:
false # This was our own activity
elif v.doppelCheck.isNone():
false # Can't prove that the activity triggers the check
else:
v.doppelCheck.get() == epoch
proc doppelgangerReady*(validator: AttachedValidator, slot: Slot): bool =
## Returns true iff the validator has passed doppelganger detection by being
## monitored in the previous epoch (or the given epoch is the activation
## epoch, in which case we always consider it ready)
##
## If we checked doppelganger, we allow the check to lag by one slot to avoid
## a race condition where the check for epoch N is ongoing and block
## block production for slot_start(N+1) is about to happen
let epoch = slot.epoch
epoch == validator.activationEpoch or
(validator.doppelCheck.isSome and
(((validator.doppelCheck.get() + 1) == epoch) or
(((validator.doppelCheck.get() + 2).start_slot) == slot)))
proc getValidatorForDuties*(
pool: ValidatorPool, key: ValidatorPubKey, slot: Slot,
doppelActivity: bool, slashingSafe: bool):
Opt[AttachedValidator] =
## Return validator only if it is ready for duties (has index and has passed
## doppelganger check where applicable)
let validator = ? pool.getValidator(key)
if validator.index.isNone():
return Opt.none(AttachedValidator)
# Sync committee duties are not slashable, so we perform them even during
# doppelganger detection
if pool.doppelgangerDetectionEnabled and
not validator.doppelgangerReady(slot) and
not slashingSafe:
notice "Doppelganger detection active - " &
"skipping validator duties while observing the network",
validator = shortLog(validator),
slot,
doppelCheck = validator.doppelCheck,
activationEpoch = shortLog(validator.activationEpoch)
return Opt.none(AttachedValidator)
if doppelActivity:
# Record the activity
# TODO consider moving to the the "registration point"
validator.doppelgangerActivity(slot.epoch)
return Opt.some(validator)
func triggersDoppelganger*(
pool: ValidatorPool, pubkey: ValidatorPubKey, epoch: Epoch): bool =
let v = pool.getValidator(pubkey)
v.isSome() and v[].triggersDoppelganger(epoch)
proc signWithDistributedKey(v: AttachedValidator,
request: Web3SignerRequest): Future[SignatureResult]
{.async.} =
doAssert v.data.threshold <= uint32(v.clients.len)
let
signatureReqs = mapIt(v.clients, it[0].signData(it[1].pubkey, request))
deadline = sleepAsync(WEB3_SIGNER_DELAY_TOLERANCE)
await allFutures(signatureReqs) or deadline
var shares: seq[SignatureShare]
var neededShares = v.data.threshold
for i, req in signatureReqs:
template shareInfo: untyped = v.clients[i][1]
if req.done and req.read.isOk:
shares.add req.read.get.toSignatureShare(shareInfo.id)
neededShares = neededShares - 1
else:
warn "Failed to obtain signature from remote signer",
pubkey = shareInfo.pubkey,
signerUrl = $(v.clients[i][0].address)
if neededShares == 0:
let recovered = shares.recoverSignature()
return SignatureResult.ok recovered.toValidatorSig
return SignatureResult.err "Not enough shares to recover the signature"
proc signWithSingleKey(v: AttachedValidator,
request: Web3SignerRequest): Future[SignatureResult]
{.async.} =
doAssert v.clients.len == 1
let (client, info) = v.clients[0]
let res = awaitWithTimeout(client.signData(info.pubkey, request),
WEB3_SIGNER_DELAY_TOLERANCE):
return SignatureResult.err "Timeout"
if res.isErr:
return SignatureResult.err res.error
else:
return SignatureResult.ok res.get.toValidatorSig
proc signData(v: AttachedValidator,
request: Web3SignerRequest): Future[SignatureResult] =
doAssert v.kind == ValidatorKind.Remote
debug "Signing request with remote signer",
validator = shortLog(v), kind = request.kind
if v.clients.len == 1:
v.signWithSingleKey(request)
else:
v.signWithDistributedKey(request)
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/phase0/validator.md#signature
proc getBlockSignature*(v: AttachedValidator, fork: Fork,
genesis_validators_root: Eth2Digest, slot: Slot,
block_root: Eth2Digest,
blck: ForkedBeaconBlock | ForkedBlindedBeaconBlock |
bellatrix_mev.BlindedBeaconBlock |
capella_mev.BlindedBeaconBlock
): Future[SignatureResult] {.async.} =
return
case v.kind
of ValidatorKind.Local:
SignatureResult.ok(
get_block_signature(
fork, genesis_validators_root, slot, block_root,
v.data.privateKey).toValidatorSig())
of ValidatorKind.Remote:
when blck is ForkedBlindedBeaconBlock:
let
web3SignerBlock =
case blck.kind
of ConsensusFork.Phase0:
Web3SignerForkedBeaconBlock(
kind: ConsensusFork.Phase0,
phase0Data: blck.phase0Data)
of ConsensusFork.Altair:
Web3SignerForkedBeaconBlock(
kind: ConsensusFork.Altair,
altairData: blck.altairData)
of ConsensusFork.Bellatrix:
Web3SignerForkedBeaconBlock(
kind: ConsensusFork.Bellatrix,
bellatrixData: blck.bellatrixData.toBeaconBlockHeader)
of ConsensusFork.Capella:
Web3SignerForkedBeaconBlock(
kind: ConsensusFork.Capella,
capellaData: blck.capellaData.toBeaconBlockHeader)
of ConsensusFork.EIP4844:
Web3SignerForkedBeaconBlock(
kind: ConsensusFork.EIP4844,
eip4844Data: blck.eip4844Data.toBeaconBlockHeader)
request = Web3SignerRequest.init(
fork, genesis_validators_root, web3SignerBlock)
await v.signData(request)
elif blck is bellatrix_mev.BlindedBeaconBlock:
let request = Web3SignerRequest.init(
fork, genesis_validators_root,
Web3SignerForkedBeaconBlock(
kind: ConsensusFork.Bellatrix,
bellatrixData: blck.toBeaconBlockHeader))
await v.signData(request)
elif blck is capella_mev.BlindedBeaconBlock:
let request = Web3SignerRequest.init(
fork, genesis_validators_root,
Web3SignerForkedBeaconBlock(
kind: ConsensusFork.Capella,
capellaData: blck.toBeaconBlockHeader))
await v.signData(request)
else:
let
web3SignerBlock =
case blck.kind
of ConsensusFork.Phase0:
Web3SignerForkedBeaconBlock(
kind: ConsensusFork.Phase0,
phase0Data: blck.phase0Data)
of ConsensusFork.Altair:
Web3SignerForkedBeaconBlock(
kind: ConsensusFork.Altair,
altairData: blck.altairData)
of ConsensusFork.Bellatrix:
Web3SignerForkedBeaconBlock(
kind: ConsensusFork.Bellatrix,
bellatrixData: blck.bellatrixData.toBeaconBlockHeader)
of ConsensusFork.Capella:
Web3SignerForkedBeaconBlock(
kind: ConsensusFork.Capella,
capellaData: blck.capellaData.toBeaconBlockHeader)
of ConsensusFork.EIP4844:
Web3SignerForkedBeaconBlock(
kind: ConsensusFork.EIP4844,
eip4844Data: blck.eip4844Data.toBeaconBlockHeader)
request = Web3SignerRequest.init(
fork, genesis_validators_root, web3SignerBlock)
await v.signData(request)
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/phase0/validator.md#aggregate-signature
proc getAttestationSignature*(v: AttachedValidator, fork: Fork,
genesis_validators_root: Eth2Digest,
data: AttestationData
): Future[SignatureResult] {.async.} =
return
case v.kind
of ValidatorKind.Local:
SignatureResult.ok(
get_attestation_signature(
fork, genesis_validators_root, data,
v.data.privateKey).toValidatorSig())
of ValidatorKind.Remote:
let request = Web3SignerRequest.init(fork, genesis_validators_root, data)
await v.signData(request)
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/phase0/validator.md#broadcast-aggregate
proc getAggregateAndProofSignature*(v: AttachedValidator,
fork: Fork,
genesis_validators_root: Eth2Digest,
aggregate_and_proof: AggregateAndProof
): Future[SignatureResult] {.async.} =
return
case v.kind
of ValidatorKind.Local:
SignatureResult.ok(
get_aggregate_and_proof_signature(
fork, genesis_validators_root, aggregate_and_proof,
v.data.privateKey).toValidatorSig()
)
of ValidatorKind.Remote:
let request = Web3SignerRequest.init(
fork, genesis_validators_root, aggregate_and_proof)
await v.signData(request)
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/altair/validator.md#prepare-sync-committee-message
proc getSyncCommitteeMessage*(v: AttachedValidator,
fork: Fork,
genesis_validators_root: Eth2Digest,
slot: Slot,
beacon_block_root: Eth2Digest
): Future[SyncCommitteeMessageResult] {.async.} =
let signature =
case v.kind
of ValidatorKind.Local:
SignatureResult.ok(get_sync_committee_message_signature(
fork, genesis_validators_root, slot, beacon_block_root,
v.data.privateKey).toValidatorSig())
of ValidatorKind.Remote:
let request = Web3SignerRequest.init(
fork, genesis_validators_root, beacon_block_root, slot)
await v.signData(request)
if signature.isErr:
return SyncCommitteeMessageResult.err("Failed to obtain signature")
return
SyncCommitteeMessageResult.ok(
SyncCommitteeMessage(
slot: slot,
beacon_block_root: beacon_block_root,
validator_index: uint64(v.index.get()),
signature: signature.get()
)
)
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/altair/validator.md#aggregation-selection
proc getSyncCommitteeSelectionProof*(v: AttachedValidator, fork: Fork,
genesis_validators_root: Eth2Digest,
slot: Slot,
subcommittee_index: SyncSubcommitteeIndex
): Future[SignatureResult] {.async.} =
return
case v.kind
of ValidatorKind.Local:
SignatureResult.ok(get_sync_committee_selection_proof(
fork, genesis_validators_root, slot, subcommittee_index,
v.data.privateKey).toValidatorSig())
of ValidatorKind.Remote:
let request = Web3SignerRequest.init(
fork, genesis_validators_root,
SyncAggregatorSelectionData(
slot: slot, subcommittee_index: uint64 subcommittee_index)
)
await v.signData(request)
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/altair/validator.md#broadcast-sync-committee-contribution
proc getContributionAndProofSignature*(v: AttachedValidator, fork: Fork,
genesis_validators_root: Eth2Digest,
contribution_and_proof: ContributionAndProof
): Future[SignatureResult] {.async.} =
return
case v.kind
of ValidatorKind.Local:
SignatureResult.ok(get_contribution_and_proof_signature(
fork, genesis_validators_root, contribution_and_proof,
v.data.privateKey).toValidatorSig())
of ValidatorKind.Remote:
let request = Web3SignerRequest.init(
fork, genesis_validators_root, contribution_and_proof)
await v.signData(request)
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/phase0/validator.md#randao-reveal
proc getEpochSignature*(v: AttachedValidator, fork: Fork,
genesis_validators_root: Eth2Digest, epoch: Epoch
): Future[SignatureResult] {.async.} =
return
case v.kind
of ValidatorKind.Local:
SignatureResult.ok(get_epoch_signature(
fork, genesis_validators_root, epoch,
v.data.privateKey).toValidatorSig())
of ValidatorKind.Remote:
let request = Web3SignerRequest.init(
fork, genesis_validators_root, epoch)
await v.signData(request)
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/phase0/validator.md#aggregation-selection
proc getSlotSignature*(v: AttachedValidator, fork: Fork,
genesis_validators_root: Eth2Digest, slot: Slot
): Future[SignatureResult] {.async.} =
if v.slotSignature.isSome and v.slotSignature.get.slot == slot:
return SignatureResult.ok(v.slotSignature.get.signature)
let signature =
case v.kind
of ValidatorKind.Local:
SignatureResult.ok(get_slot_signature(
fork, genesis_validators_root, slot,
v.data.privateKey).toValidatorSig())
of ValidatorKind.Remote:
let request = Web3SignerRequest.init(fork, genesis_validators_root, slot)
await v.signData(request)
if signature.isErr:
return signature
v.slotSignature = Opt.some((slot, signature.get))
return signature
# https://github.com/ethereum/builder-specs/blob/v0.3.0/specs/bellatrix/builder.md#signing
proc getBuilderSignature*(v: AttachedValidator, fork: Fork,
validatorRegistration: ValidatorRegistrationV1):
Future[SignatureResult] {.async.} =
return
case v.kind
of ValidatorKind.Local:
SignatureResult.ok(get_builder_signature(
fork, validatorRegistration, v.data.privateKey).toValidatorSig())
of ValidatorKind.Remote:
let request = Web3SignerRequest.init(
fork, ZERO_HASH, validatorRegistration)
await v.signData(request)
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