414 lines
14 KiB
Nim
414 lines
14 KiB
Nim
# Nimbus
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# Copyright (c) 2018 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except
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# according to those terms.
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import
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std/[sequtils, sets, times],
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../constants,
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../db/[db_chain, accounts_cache],
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../transaction,
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../utils/[difficulty, header, pow],
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".."/[vm_state, vm_types, forks, errors],
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./dao,
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./gaslimit,
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chronicles,
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eth/[common, rlp],
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nimcrypto/utils,
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stew/[objects, results, endians2]
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from stew/byteutils
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import nil
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export
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pow.PowRef,
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pow.new,
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results
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{.push raises: [Defect].}
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const
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daoForkBlockExtraData* =
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byteutils.hexToByteArray[13](DAOForkBlockExtra).toSeq
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# ------------------------------------------------------------------------------
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# Private Helpers
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# ------------------------------------------------------------------------------
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func isGenesis(header: BlockHeader): bool =
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header.blockNumber == 0.u256 and
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header.parentHash == GENESIS_PARENT_HASH
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# ------------------------------------------------------------------------------
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# Pivate validator functions
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# ------------------------------------------------------------------------------
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proc validateSeal(pow: PowRef; header: BlockHeader): Result[void,string] =
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let (expMixDigest, miningValue) = try:
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pow.getPowDigest(header)
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except CatchableError as err:
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return err("test")
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if expMixDigest != header.mixDigest:
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let
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miningHash = header.getPowSpecs.miningHash
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(size, cachedHash) = try: pow.getPowCacheLookup(header.blockNumber)
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except KeyError: return err("Unknown block")
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except CatchableError as e: return err(e.msg)
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debug "mixHash mismatch",
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actual = header.mixDigest,
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expected = expMixDigest,
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blockNumber = header.blockNumber,
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miningHash = miningHash,
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nonce = header.nonce.toHex,
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difficulty = header.difficulty,
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size = size,
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cachedHash = cachedHash
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return err("mixHash mismatch")
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let value = UInt256.fromBytesBE(miningValue.data)
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if value > UInt256.high div header.difficulty:
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return err("mining difficulty error")
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ok()
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proc validateHeader(db: BaseChainDB; header, parentHeader: BlockHeader;
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numTransactions: int; checkSealOK: bool;
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ttdReached: bool; pow: PowRef): Result[void,string] =
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template inDAOExtraRange(blockNumber: BlockNumber): bool =
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# EIP-799
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# Blocks with block numbers in the range [1_920_000, 1_920_009]
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# MUST have DAOForkBlockExtra
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let DAOHigh = db.config.daoForkBlock + DAOForkExtraRange.u256
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db.config.daoForkBlock <= blockNumber and
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blockNumber < DAOHigh
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if header.extraData.len > 32:
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return err("BlockHeader.extraData larger than 32 bytes")
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if header.gasUsed == 0 and 0 < numTransactions:
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return err("zero gasUsed but tranactions present");
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if header.gasUsed < 0 or header.gasUsed > header.gasLimit:
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return err("gasUsed should be non negative and smaller or equal gasLimit")
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if header.blockNumber != parentHeader.blockNumber + 1:
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return err("Blocks must be numbered consecutively")
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if header.timestamp.toUnix <= parentHeader.timestamp.toUnix:
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return err("timestamp must be strictly later than parent")
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if db.config.daoForkSupport and inDAOExtraRange(header.blockNumber):
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if header.extraData != daoForkBlockExtraData:
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return err("header extra data should be marked DAO")
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if ttdReached:
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# EIP-4399 and EIP-3675
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# no need to check mixDigest because EIP-4399 override this field
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# checking rule
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if not header.difficulty.isZero:
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return err("Non-zero difficulty in a post-merge block")
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if not header.nonce.isZeroMemory:
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return err("Non-zero nonce in a post-merge block")
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if header.ommersHash != EMPTY_UNCLE_HASH:
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return err("Invalid ommers hash in a post-merge block")
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else:
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let calcDiffc = db.config.calcDifficulty(header.timestamp, parentHeader)
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if header.difficulty < calcDiffc:
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return err("provided header difficulty is too low")
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if checkSealOK:
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return pow.validateSeal(header)
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result = ok()
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func validateUncle(currBlock, uncle, uncleParent: BlockHeader):
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Result[void,string] =
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if uncle.blockNumber >= currBlock.blockNumber:
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return err("uncle block number larger than current block number")
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if uncle.blockNumber != uncleParent.blockNumber + 1:
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return err("Uncle number is not one above ancestor's number")
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if uncle.timestamp.toUnix < uncleParent.timestamp.toUnix:
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return err("Uncle timestamp is before ancestor's timestamp")
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if uncle.gasUsed > uncle.gasLimit:
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return err("Uncle's gas usage is above the limit")
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result = ok()
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proc validateUncles(chainDB: BaseChainDB; header: BlockHeader;
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uncles: seq[BlockHeader]; checkSealOK: bool;
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pow: PowRef): Result[void,string] =
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let hasUncles = uncles.len > 0
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let shouldHaveUncles = header.ommersHash != EMPTY_UNCLE_HASH
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if not hasUncles and not shouldHaveUncles:
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# optimization to avoid loading ancestors from DB, since the block has
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# no uncles
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return ok()
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if hasUncles and not shouldHaveUncles:
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return err("Block has uncles but header suggests uncles should be empty")
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if shouldHaveUncles and not hasUncles:
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return err("Header suggests block should have uncles but block has none")
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# Check for duplicates
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var uncleSet = initHashSet[Hash256]()
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for uncle in uncles:
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let uncleHash = uncle.blockHash
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if uncleHash in uncleSet:
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return err("Block contains duplicate uncles")
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else:
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uncleSet.incl uncleHash
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let recentAncestorHashes = try:
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chainDB.getAncestorsHashes(MAX_UNCLE_DEPTH + 1, header)
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except CatchableError as err:
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return err("Block not present in database")
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let recentUncleHashes = try:
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chainDB.getUncleHashes(recentAncestorHashes)
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except CatchableError as err:
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return err("Ancenstors not present in database")
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let blockHash = header.blockHash
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for uncle in uncles:
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let uncleHash = uncle.blockHash
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if uncleHash == blockHash:
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return err("Uncle has same hash as block")
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# ensure the uncle has not already been included.
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if uncleHash in recentUncleHashes:
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return err("Duplicate uncle")
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# ensure that the uncle is not one of the canonical chain blocks.
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if uncleHash in recentAncestorHashes:
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return err("Uncle cannot be an ancestor")
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# ensure that the uncle was built off of one of the canonical chain
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# blocks.
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if (uncle.parentHash notin recentAncestorHashes) or
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(uncle.parentHash == header.parentHash):
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return err("Uncle's parent is not an ancestor")
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# check uncle against own parent
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var parent: BlockHeader
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if not chainDB.getBlockHeader(uncle.parentHash,parent):
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return err("Uncle's parent has gone missing")
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if uncle.timestamp <= parent.timestamp:
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return err("Uncle's parent must me older")
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# Now perform VM level validation of the uncle
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if checkSealOK:
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result = pow.validateSeal(uncle)
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if result.isErr:
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return
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let uncleParent = try:
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chainDB.getBlockHeader(uncle.parentHash)
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except BlockNotFound:
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return err("Uncle parent not found")
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result = validateUncle(header, uncle, uncleParent)
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if result.isErr:
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return
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result = chainDB.validateGasLimitOrBaseFee(uncle, uncleParent)
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if result.isErr:
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return
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result = ok()
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# ------------------------------------------------------------------------------
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# Public function, extracted from executor
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# ------------------------------------------------------------------------------
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proc validateTransaction*(
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roDB: ReadOnlyStateDB; ## Parent accounts environment for transaction
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tx: Transaction; ## tx to validate
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sender: EthAddress; ## tx.getSender or tx.ecRecover
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maxLimit: GasInt; ## gasLimit from block header
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baseFee: UInt256; ## baseFee from block header
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fork: Fork): bool =
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let
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balance = roDB.getBalance(sender)
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nonce = roDB.getNonce(sender)
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if tx.txType == TxEip2930 and fork < FkBerlin:
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debug "invalid tx: Eip2930 Tx type detected before Berlin"
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return false
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if tx.txType == TxEip1559 and fork < FkLondon:
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debug "invalid tx: Eip1559 Tx type detected before London"
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return false
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# Note that the following check bears some plausibility but is _not_
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# covered by the eip-1559 reference (sort of) pseudo code, for details
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# see `https://eips.ethereum.org/EIPS/eip-1559#specification`_
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#
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# Rather this check is needed for surviving the post-London unit test
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# eth_tests/GeneralStateTests/stEIP1559/lowGasLimit.json which seems to
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# be sourced and generated from
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# eth_tests/src/GeneralStateTestsFiller/stEIP1559/lowGasLimitFiller.yml
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#
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# Interestingly, the hive tests do not use this particular test but rather
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# eth_tests/BlockchainTests/GeneralStateTests/stEIP1559/lowGasLimit.json
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# from a parallel tests series which look like somehow expanded versions.
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#
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# The parallel lowGasLimit.json test never triggers the case checked below
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# as the paricular transaction is omitted (the txs list is just set empty.)
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if maxLimit < tx.gasLimit:
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debug "invalid tx: block header gasLimit exceeded",
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maxLimit,
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gasLimit = tx.gasLimit
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return false
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# ensure that the user was willing to at least pay the base fee
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if tx.maxFee < baseFee.truncate(int64):
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debug "invalid tx: maxFee is smaller than baseFee",
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maxFee = tx.maxFee,
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baseFee
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return false
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# The total must be the larger of the two
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if tx.maxFee < tx.maxPriorityFee:
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debug "invalid tx: maxFee is smaller than maPriorityFee",
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maxFee = tx.maxFee,
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maxPriorityFee = tx.maxPriorityFee
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return false
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# the signer must be able to fully afford the transaction
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let gasCost = if tx.txType >= TxEip1559:
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tx.gasLimit.u256 * tx.maxFee.u256
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else:
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tx.gasLimit.u256 * tx.gasPrice.u256
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if balance < gasCost:
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debug "invalid tx: not enough cash for gas",
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available = balance,
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require = gasCost
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return false
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if balance - gasCost < tx.value:
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debug "invalid tx: not enough cash to send",
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available=balance,
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availableMinusGas=balance-gasCost,
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require=tx.value
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return false
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if tx.gasLimit < tx.intrinsicGas(fork):
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debug "invalid tx: not enough gas to perform calculation",
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available=tx.gasLimit,
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require=tx.intrinsicGas(fork)
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return false
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if tx.nonce != nonce:
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debug "invalid tx: account nonce mismatch",
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txNonce=tx.nonce,
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accountNonce=nonce
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return false
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# EIP-3607 Reject transactions from senders with deployed code
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# The EIP spec claims this attack never happened before
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# Clients might choose to disable this rule for RPC calls like
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# `eth_call` and `eth_estimateGas`
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# EOA = Externally Owned Account
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let codeHash = roDB.getCodeHash(sender)
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if codeHash != EMPTY_SHA3:
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debug "invalid tx: sender is not an EOA",
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sender=sender.toHex,
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codeHash=codeHash.data.toHex
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return false
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true
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proc validateTransaction*(
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vmState: BaseVMState; ## Parent accounts environment for transaction
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tx: Transaction; ## tx to validate
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sender: EthAddress; ## tx.getSender or tx.ecRecover
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header: BlockHeader; ## Header for the block containing the current tx
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fork: Fork): bool =
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## Variant of `validateTransaction()`
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let
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roDB = vmState.readOnlyStateDB
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gasLimit = header.gasLimit
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baseFee = header.baseFee
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roDB.validateTransaction(tx, sender, gasLimit, baseFee, fork)
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# ------------------------------------------------------------------------------
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# Public functions, extracted from test_blockchain_json
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# ------------------------------------------------------------------------------
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proc validateHeaderAndKinship*(
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chainDB: BaseChainDB;
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header: BlockHeader;
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uncles: seq[BlockHeader];
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numTransactions: int;
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checkSealOK: bool;
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ttdReached: bool;
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pow: PowRef): Result[void, string] =
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if header.isGenesis:
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if header.extraData.len > 32:
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return err("BlockHeader.extraData larger than 32 bytes")
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return ok()
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let parent = try:
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chainDB.getBlockHeader(header.parentHash)
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except CatchableError as err:
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return err("Failed to load block header from DB")
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result = chainDB.validateHeader(
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header, parent, numTransactions, checkSealOK, ttdReached, pow)
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if result.isErr:
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return
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if uncles.len > MAX_UNCLES:
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return err("Number of uncles exceed limit.")
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if not chainDB.exists(header.stateRoot):
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return err("`state_root` was not found in the db.")
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if not ttdReached:
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result = chainDB.validateUncles(header, uncles, checkSealOK, pow)
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if result.isOk:
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result = chainDB.validateGasLimitOrBaseFee(header, parent)
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proc validateHeaderAndKinship*(
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chainDB: BaseChainDB;
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header: BlockHeader;
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body: BlockBody;
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checkSealOK: bool;
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ttdReached: bool;
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pow: PowRef): Result[void, string] {.gcsafe,raises: [CatchableError, Defect].} =
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chainDB.validateHeaderAndKinship(
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header, body.uncles, body.transactions.len, checkSealOK, ttdReached, pow)
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proc validateHeaderAndKinship*(
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chainDB: BaseChainDB;
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ethBlock: EthBlock;
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checkSealOK: bool;
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ttdReached: bool;
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pow: PowRef): Result[void,string] =
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chainDB.validateHeaderAndKinship(
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ethBlock.header, ethBlock.uncles, ethBlock.txs.len,
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checkSealOK, ttdReached, pow)
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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