627 lines
24 KiB
Nim
627 lines
24 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2023 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [].}
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import
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std/[tables, json, streams, sequtils, uri],
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chronos, chronicles, metrics, eth/async_utils,
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json_serialization/std/net,
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presto, presto/client,
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../spec/[keystore, signatures, helpers, crypto],
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../spec/datatypes/[phase0, altair],
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../spec/eth2_apis/[rest_types, eth2_rest_serialization,
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rest_remote_signer_calls],
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../filepath,
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./slashing_protection
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export
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streams, keystore, phase0, altair, tables, uri, crypto,
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rest_types, eth2_rest_serialization, rest_remote_signer_calls,
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slashing_protection
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const
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WEB3_SIGNER_DELAY_TOLERANCE = 3.seconds
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DOPPELGANGER_EPOCHS_COUNT = 1
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## The number of full epochs that we monitor validators for doppelganger
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## protection
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declareGauge validators,
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"Number of validators attached to the beacon node"
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type
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ValidatorKind* {.pure.} = enum
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Local, Remote
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ValidatorConnection* = RestClientRef
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ValidatorAndIndex* = object
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index*: ValidatorIndex
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validator*: Validator
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DoppelgangerStatus {.pure.} = enum
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Unknown, Checking, Checked
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AttachedValidator* = ref object
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data*: KeystoreData
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case kind*: ValidatorKind
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of ValidatorKind.Local:
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discard
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of ValidatorKind.Remote:
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clients*: seq[(RestClientRef, RemoteSignerInfo)]
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threshold*: uint32
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updated*: bool
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index*: Opt[ValidatorIndex]
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## Validator index which is assigned after the eth1 deposit has been
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## processed - this index is valid across all eth2 forks for fork depths
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## up to ETH1_FOLLOW_DISTANCE - we don't support changing indices.
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activationEpoch*: Epoch
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## Epoch when validator activated - this happens at the time or some time
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## after the validator index has been assigned depending on how many
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## validators are in the activation queue - this is the first epoch that
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## the validator starts performing duties
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# Cache the latest slot signature - the slot signature is used to determine
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# if the validator will be aggregating (in the near future)
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slotSignature*: Opt[tuple[slot: Slot, signature: ValidatorSig]]
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# For the external payload builder; each epoch, the external payload
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# builder should be informed of current validators
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externalBuilderRegistration*: Opt[SignedValidatorRegistrationV1]
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doppelStatus: DoppelgangerStatus
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doppelEpoch*: Opt[Epoch]
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## The epoch where doppelganger detection started doing its monitoring
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lastWarning*: Opt[Slot]
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SignResponse* = Web3SignerDataResponse
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SignatureResult* = Result[ValidatorSig, string]
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SyncCommitteeMessageResult* = Result[SyncCommitteeMessage, string]
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ValidatorPool* = object
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validators*: Table[ValidatorPubKey, AttachedValidator]
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slashingProtection*: SlashingProtectionDB
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doppelgangerDetectionEnabled*: bool
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template pubkey*(v: AttachedValidator): ValidatorPubKey =
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v.data.pubkey
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func shortLog*(v: AttachedValidator): string =
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case v.kind
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of ValidatorKind.Local:
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shortLog(v.pubkey)
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of ValidatorKind.Remote:
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shortLog(v.pubkey)
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func init*(T: type ValidatorPool,
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slashingProtectionDB: SlashingProtectionDB,
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doppelgangerDetectionEnabled: bool): T =
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## Initialize the validator pool and the slashing protection service
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## `genesis_validators_root` is used as an unique ID for the
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## blockchain
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## `backend` is the KeyValue Store backend
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T(
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slashingProtection: slashingProtectionDB,
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doppelgangerDetectionEnabled: doppelgangerDetectionEnabled)
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template count*(pool: ValidatorPool): int =
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len(pool.validators)
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proc addLocalValidator(
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pool: var ValidatorPool, keystore: KeystoreData,
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feeRecipient: Eth1Address): AttachedValidator =
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doAssert keystore.kind == KeystoreKind.Local
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let v = AttachedValidator(
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kind: ValidatorKind.Local,
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data: keystore,
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externalBuilderRegistration: Opt.none SignedValidatorRegistrationV1,
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activationEpoch: FAR_FUTURE_EPOCH
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)
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pool.validators[v.pubkey] = v
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# Fee recipient may change after startup, but we log the initial value here
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notice "Local validator attached",
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pubkey = v.pubkey,
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validator = shortLog(v),
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initial_fee_recipient = feeRecipient.toHex()
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validators.set(pool.count().int64)
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v
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proc addRemoteValidator(pool: var ValidatorPool, keystore: KeystoreData,
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clients: seq[(RestClientRef, RemoteSignerInfo)],
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feeRecipient: Eth1Address): AttachedValidator =
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doAssert keystore.kind == KeystoreKind.Remote
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let v = AttachedValidator(
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kind: ValidatorKind.Remote,
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data: keystore,
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clients: clients,
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externalBuilderRegistration: Opt.none SignedValidatorRegistrationV1,
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activationEpoch: FAR_FUTURE_EPOCH,
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)
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pool.validators[v.pubkey] = v
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notice "Remote validator attached",
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pubkey = v.pubkey,
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validator = shortLog(v),
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remote_signer = $keystore.remotes,
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initial_fee_recipient = feeRecipient.toHex()
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validators.set(pool.count().int64)
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v
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proc addRemoteValidator(pool: var ValidatorPool,
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keystore: KeystoreData,
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feeRecipient: Eth1Address): AttachedValidator =
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let
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httpFlags =
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if RemoteKeystoreFlag.IgnoreSSLVerification in keystore.flags:
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{HttpClientFlag.NoVerifyHost, HttpClientFlag.NoVerifyServerName}
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else:
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{}
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prestoFlags = {RestClientFlag.CommaSeparatedArray}
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clients =
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block:
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var res: seq[(RestClientRef, RemoteSignerInfo)]
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for remote in keystore.remotes:
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let client = RestClientRef.new($remote.url, prestoFlags, httpFlags)
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if client.isErr():
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# TODO keep trying in case of temporary network failure
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warn "Unable to resolve distributed signer address",
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remote_url = $remote.url, validator = $remote.pubkey
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else:
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res.add((client.get(), remote))
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res
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pool.addRemoteValidator(keystore, clients, feeRecipient)
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proc addValidator*(pool: var ValidatorPool,
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keystore: KeystoreData,
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feeRecipient: Eth1Address): AttachedValidator =
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pool.validators.withValue(keystore.pubkey, v):
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notice "Adding already-known validator", validator = shortLog(v[])
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return v[]
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case keystore.kind
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of KeystoreKind.Local: pool.addLocalValidator(keystore, feeRecipient)
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of KeystoreKind.Remote: pool.addRemoteValidator(keystore, feeRecipient)
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proc getValidator*(pool: ValidatorPool,
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validatorKey: ValidatorPubKey): AttachedValidator =
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pool.validators.getOrDefault(validatorKey)
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proc contains*(pool: ValidatorPool, pubkey: ValidatorPubKey): bool =
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## Returns ``true`` if validator with key ``pubkey`` present in ``pool``.
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pool.validators.contains(pubkey)
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proc removeValidator*(pool: var ValidatorPool, pubkey: ValidatorPubKey) =
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## Delete validator with public key ``pubkey`` from ``pool``.
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let validator = pool.validators.getOrDefault(pubkey)
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if not(isNil(validator)):
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pool.validators.del(pubkey)
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case validator.kind
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of ValidatorKind.Local:
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notice "Local validator detached", pubkey, validator = shortLog(validator)
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of ValidatorKind.Remote:
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notice "Remote validator detached", pubkey,
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validator = shortLog(validator)
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validators.set(pool.count().int64)
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proc needsUpdate*(validator: AttachedValidator): bool =
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validator.index.isNone() or validator.activationEpoch == FAR_FUTURE_EPOCH
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proc updateValidator*(
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validator: AttachedValidator, validatorData: Opt[ValidatorAndIndex]) =
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defer: validator.updated = true
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let
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data = validatorData.valueOr:
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if not validator.updated:
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notice "Validator deposit not yet processed, monitoring",
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pubkey = validator.pubkey
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return
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index = data.index
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activationEpoch = data.validator.activation_epoch
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## Update activation information for a validator
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if validator.index != Opt.some data.index:
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validator.index = Opt.some data.index
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if validator.activationEpoch != data.validator.activation_epoch:
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# In theory, activation epoch could change but that's rare enough that it
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# shouldn't practically matter for the current uses
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info "Validator activation updated",
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validator = shortLog(validator), pubkey = validator.pubkey, index,
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activationEpoch
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validator.activationEpoch = activationEpoch
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if validator.doppelStatus == DoppelgangerStatus.Unknown:
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if validator.doppelEpoch.isSome() and activationEpoch != FAR_FUTURE_EPOCH:
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let doppelEpoch = validator.doppelEpoch.get()
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if doppelEpoch >= validator.activationEpoch + DOPPELGANGER_EPOCHS_COUNT:
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validator.doppelStatus = DoppelgangerStatus.Checking
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else:
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validator.doppelStatus = DoppelgangerStatus.Checked
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proc close*(pool: var ValidatorPool) =
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## Unlock and close all validator keystore's files managed by ``pool``.
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for validator in pool.validators.values():
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let res = validator.data.handle.closeLockedFile()
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if res.isErr():
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notice "Could not unlock validator's keystore file",
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pubkey = validator.pubkey, validator = shortLog(validator)
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iterator publicKeys*(pool: ValidatorPool): ValidatorPubKey =
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for item in pool.validators.keys():
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yield item
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iterator indices*(pool: ValidatorPool): ValidatorIndex =
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for item in pool.validators.values():
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if item.index.isSome():
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yield item.index.get()
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iterator items*(pool: ValidatorPool): AttachedValidator =
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for item in pool.validators.values():
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yield item
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proc triggersDoppelganger*(v: AttachedValidator, epoch: Epoch): bool =
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## Returns true iff detected activity in the given epoch would trigger
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## doppelganger detection
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if v.doppelStatus != DoppelgangerStatus.Checked:
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if v.activationEpoch == FAR_FUTURE_EPOCH:
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false
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elif epoch < v.activationEpoch + DOPPELGANGER_EPOCHS_COUNT:
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v.doppelStatus = DoppelgangerStatus.Checked
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false
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else:
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true
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else:
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false
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proc updateDoppelganger*(validator: AttachedValidator, epoch: Epoch) =
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## Called when the validator has proven to be inactive in the given epoch -
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## this call should be made after the end of `epoch` before acting on duties
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## in `epoch + 1`.
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if validator.doppelStatus == DoppelgangerStatus.Checked:
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return
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if validator.doppelEpoch.isNone():
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validator.doppelEpoch = Opt.some epoch
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let doppelEpoch = validator.doppelEpoch.get()
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if validator.doppelStatus == DoppelgangerStatus.Unknown:
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if validator.activationEpoch == FAR_FUTURE_EPOCH:
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return
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# We don't do doppelganger checking for validators that are about to be
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# activated since both clients would be waiting for the other to start
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# performing duties - this accounts for genesis as well
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# The slot is rounded up to ensure we cover all slots
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if doppelEpoch + 1 <= validator.activationEpoch + DOPPELGANGER_EPOCHS_COUNT:
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validator.doppelStatus = DoppelgangerStatus.Checked
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return
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validator.doppelStatus = DoppelgangerStatus.Checking
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if epoch + 1 >= doppelEpoch + DOPPELGANGER_EPOCHS_COUNT:
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validator.doppelStatus = DoppelgangerStatus.Checked
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proc getValidatorForDuties*(
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pool: ValidatorPool, key: ValidatorPubKey, slot: Slot):
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Opt[AttachedValidator] =
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## Return validator only if it is ready for duties (has index and has passed
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## doppelganger check where applicable)
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let validator = pool.getValidator(key)
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if isNil(validator) or validator.index.isNone():
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return Opt.none(AttachedValidator)
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if pool.doppelgangerDetectionEnabled and
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validator.triggersDoppelganger(slot.epoch):
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# If the validator would trigger for an activity in the given slot, we don't
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# return it for duties
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notice "Doppelganger detection active - " &
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"skipping validator duties while observing the network",
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validator = shortLog(validator)
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return Opt.none(AttachedValidator)
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return Opt.some(validator)
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proc signWithDistributedKey(v: AttachedValidator,
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request: Web3SignerRequest): Future[SignatureResult]
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{.async.} =
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doAssert v.data.threshold <= uint32(v.clients.len)
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let
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signatureReqs = mapIt(v.clients, it[0].signData(it[1].pubkey, request))
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deadline = sleepAsync(WEB3_SIGNER_DELAY_TOLERANCE)
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await allFutures(signatureReqs) or deadline
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var shares: seq[SignatureShare]
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var neededShares = v.data.threshold
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for i, req in signatureReqs:
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template shareInfo: untyped = v.clients[i][1]
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if req.done and req.read.isOk:
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shares.add req.read.get.toSignatureShare(shareInfo.id)
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neededShares = neededShares - 1
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else:
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warn "Failed to obtain signature from remote signer",
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pubkey = shareInfo.pubkey,
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signerUrl = $(v.clients[i][0].address)
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if neededShares == 0:
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let recovered = shares.recoverSignature()
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return SignatureResult.ok recovered.toValidatorSig
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return SignatureResult.err "Not enough shares to recover the signature"
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proc signWithSingleKey(v: AttachedValidator,
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request: Web3SignerRequest): Future[SignatureResult]
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{.async.} =
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doAssert v.clients.len == 1
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let (client, info) = v.clients[0]
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let res = awaitWithTimeout(client.signData(info.pubkey, request),
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WEB3_SIGNER_DELAY_TOLERANCE):
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return SignatureResult.err "Timeout"
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if res.isErr:
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return SignatureResult.err res.error
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else:
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return SignatureResult.ok res.get.toValidatorSig
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proc signData(v: AttachedValidator,
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request: Web3SignerRequest): Future[SignatureResult] =
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doAssert v.kind == ValidatorKind.Remote
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debug "Signing request with remote signer",
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validator = shortLog(v), kind = request.kind
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if v.clients.len == 1:
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v.signWithSingleKey(request)
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else:
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v.signWithDistributedKey(request)
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/phase0/validator.md#signature
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proc getBlockSignature*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest, slot: Slot,
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block_root: Eth2Digest,
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blck: ForkedBeaconBlock | ForkedBlindedBeaconBlock |
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bellatrix_mev.BlindedBeaconBlock
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): Future[SignatureResult] {.async.} =
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return
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case v.kind
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of ValidatorKind.Local:
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SignatureResult.ok(
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get_block_signature(
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fork, genesis_validators_root, slot, block_root,
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v.data.privateKey).toValidatorSig())
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of ValidatorKind.Remote:
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when blck is ForkedBlindedBeaconBlock:
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let
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web3SignerBlock =
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case blck.kind
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of ConsensusFork.Phase0:
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Web3SignerForkedBeaconBlock(
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kind: ConsensusFork.Phase0,
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phase0Data: blck.phase0Data)
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of ConsensusFork.Altair:
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Web3SignerForkedBeaconBlock(
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kind: ConsensusFork.Altair,
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altairData: blck.altairData)
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of ConsensusFork.Bellatrix:
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Web3SignerForkedBeaconBlock(
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kind: ConsensusFork.Bellatrix,
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bellatrixData: blck.bellatrixData.toBeaconBlockHeader)
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of ConsensusFork.Capella:
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Web3SignerForkedBeaconBlock(
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kind: ConsensusFork.Capella,
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capellaData: blck.capellaData.toBeaconBlockHeader)
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of ConsensusFork.EIP4844:
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Web3SignerForkedBeaconBlock(
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kind: ConsensusFork.EIP4844,
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eip4844Data: blck.eip4844Data.toBeaconBlockHeader)
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request = Web3SignerRequest.init(
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fork, genesis_validators_root, web3SignerBlock)
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await v.signData(request)
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elif blck is BlindedBeaconBlock:
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let request = Web3SignerRequest.init(
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fork, genesis_validators_root,
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Web3SignerForkedBeaconBlock(
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kind: ConsensusFork.Bellatrix,
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bellatrixData: blck.toBeaconBlockHeader))
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await v.signData(request)
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else:
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let
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web3SignerBlock =
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case blck.kind
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of ConsensusFork.Phase0:
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Web3SignerForkedBeaconBlock(
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kind: ConsensusFork.Phase0,
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phase0Data: blck.phase0Data)
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of ConsensusFork.Altair:
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Web3SignerForkedBeaconBlock(
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kind: ConsensusFork.Altair,
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altairData: blck.altairData)
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of ConsensusFork.Bellatrix:
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Web3SignerForkedBeaconBlock(
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kind: ConsensusFork.Bellatrix,
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bellatrixData: blck.bellatrixData.toBeaconBlockHeader)
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of ConsensusFork.Capella:
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Web3SignerForkedBeaconBlock(
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kind: ConsensusFork.Capella,
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capellaData: blck.capellaData.toBeaconBlockHeader)
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of ConsensusFork.EIP4844:
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Web3SignerForkedBeaconBlock(
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kind: ConsensusFork.EIP4844,
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eip4844Data: blck.eip4844Data.toBeaconBlockHeader)
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request = Web3SignerRequest.init(
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fork, genesis_validators_root, web3SignerBlock)
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await v.signData(request)
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/phase0/validator.md#aggregate-signature
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proc getAttestationSignature*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest,
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data: AttestationData
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): Future[SignatureResult] {.async.} =
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return
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case v.kind
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of ValidatorKind.Local:
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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/v0.2.0/specs/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)
|