nimbus-eth2/beacon_chain/keystore_management.nim

758 lines
25 KiB
Nim

import
std/[os, strutils, terminal, wordwrap, unicode],
chronicles, chronos, web3, stint, json_serialization,
serialization, blscurve, eth/common/eth_types, eth/keys, confutils, bearssl,
spec/[datatypes, digest, crypto, keystore],
stew/[byteutils, io2], libp2p/crypto/crypto as lcrypto,
nimcrypto/utils as ncrutils,
conf, ssz/merkleization, network_metadata
export
keystore
{.push raises: [Defect].}
const
keystoreFileName* = "keystore.json"
netKeystoreFileName* = "network_keystore.json"
type
WalletPathPair* = object
wallet*: Wallet
path*: string
CreatedWallet* = object
walletPath*: WalletPathPair
mnemonic*: Mnemonic
const
minPasswordLen = 10
mostCommonPasswords = wordListArray(
currentSourcePath.parentDir /
"../vendor/nimbus-security-resources/passwords/10-million-password-list-top-100000.txt",
minWordLen = minPasswordLen)
template echo80(msg: string) =
echo wrapWords(msg, 80)
proc checkAndCreateDataDir*(dataDir: string): bool =
## Checks `conf.dataDir`.
## If folder exists, procedure will check it for access and
## permissions `0750 (rwxr-x---)`, if folder do not exists it will be created
## with permissions `0750 (rwxr-x---)`.
let amask = {AccessFlags.Read, AccessFlags.Write, AccessFlags.Execute}
when defined(posix):
if fileAccessible(dataDir, amask):
let gmask = {UserRead, UserWrite, UserExec, GroupRead, GroupExec}
let pmask = {OtherRead, OtherWrite, OtherExec, GroupWrite}
let pres = getPermissionsSet(dataDir)
if pres.isErr():
fatal "Could not check data folder permissions",
data_dir = dataDir, errorCode = $pres.error,
errorMsg = ioErrorMsg(pres.error)
false
else:
let insecurePermissions = pres.get() * pmask
if insecurePermissions != {}:
fatal "Data folder has insecure permissions",
data_dir = dataDir,
insecure_permissions = $insecurePermissions,
current_permissions = pres.get().toString(),
required_permissions = gmask.toString()
false
else:
true
else:
let res = createPath(dataDir, 0o750)
if res.isErr():
fatal "Could not create data folder", data_dir = dataDir,
errorMsg = ioErrorMsg(res.error), errorCode = $res.error
false
else:
true
elif defined(windows):
if fileAccessible(dataDir, amask):
let res = createPath(dataDir, 0o750)
if res.isErr():
fatal "Could not create data folder", data_dir = dataDir,
errorMsg = ioErrorMsg(res.error), errorCode = $res.error
false
else:
true
else:
true
else:
fatal "Unsupported operation system"
return false
proc checkSensitiveFilePermissions*(filePath: string): bool =
## Check if ``filePath`` has only "(600) rw-------" permissions.
## Procedure returns ``false`` if permissions are different
when defined(windows):
# Windows do not support per-user/group/other permissions,
# skiping verification part.
true
else:
let allowedMask = {UserRead, UserWrite}
let mask = {UserExec,
GroupRead, GroupWrite, GroupExec,
OtherRead, OtherWrite, OtherExec}
let pres = getPermissionsSet(filePath)
if pres.isErr():
error "Could not check file permissions",
key_path = filePath, errorCode = $pres.error,
errorMsg = ioErrorMsg(pres.error)
false
else:
let insecurePermissions = pres.get() * mask
if insecurePermissions != {}:
error "File has insecure permissions",
key_path = filePath,
insecure_permissions = $insecurePermissions,
current_permissions = pres.get().toString(),
required_permissions = allowedMask.toString()
false
else:
true
proc keyboardCreatePassword(prompt: string, confirm: string): KsResult[string] =
while true:
let password =
try:
readPasswordFromStdin(prompt)
except IOError:
error "Could not read password from stdin"
return err("Could not read password from stdin")
# We treat `password` as UTF-8 encoded string.
if validateUtf8(password) == -1:
if runeLen(password) < minPasswordLen:
echo80 "The entered password should be at least " & $minPasswordLen &
" characters."
continue
elif password in mostCommonPasswords:
echo80 "The entered password is too commonly used and it would be " &
"easy to brute-force with automated tools."
continue
else:
echo80 "Entered password is not valid UTF-8 string"
continue
let confirmedPassword =
try:
readPasswordFromStdin(confirm)
except IOError:
error "Could not read password from stdin"
return err("Could not read password from stdin")
if password != confirmedPassword:
echo "Passwords don't match, please try again"
continue
return ok(password)
proc keyboardGetPassword[T](prompt: string, attempts: int,
pred: proc(p: string): KsResult[T] {.closure.}): KsResult[T] =
var
remainingAttempts = attempts
counter = 1
while remainingAttempts > 0:
let passphrase =
try:
readPasswordFromStdin(prompt)
except IOError as exc:
error "Could not read password from stdin"
return
os.sleep(1000 * counter)
let res = pred(passphrase)
if res.isOk():
return res
else:
inc(counter)
dec(remainingAttempts)
err("Failed to decrypt keystore")
proc loadKeystore(validatorsDir, secretsDir, keyName: string,
nonInteractive: bool): Option[ValidatorPrivKey] =
let
keystorePath = validatorsDir / keyName / keystoreFileName
keystore =
try: Json.loadFile(keystorePath, Keystore)
except IOError as err:
error "Failed to read keystore", err = err.msg, path = keystorePath
return
except SerializationError as err:
error "Invalid keystore", err = err.formatMsg(keystorePath)
return
let passphrasePath = secretsDir / keyName
if fileExists(passphrasePath):
if not(checkSensitiveFilePermissions(passphrasePath)):
error "Password file has insecure permissions", key_path = keyStorePath
return
let passphrase = KeystorePass:
try:
readFile(passphrasePath)
except IOError as err:
error "Failed to read passphrase file", err = err.msg,
path = passphrasePath
return
let res = decryptKeystore(keystore, passphrase)
if res.isOk:
return res.get.some
else:
error "Failed to decrypt keystore", keystorePath, passphrasePath
return
if nonInteractive:
error "Unable to load validator key store. Please ensure matching passphrase exists in the secrets dir",
keyName, validatorsDir, secretsDir = secretsDir
return
let prompt = "Please enter passphrase for key \"" &
(validatorsDir / keyName) & "\": "
let res = keyboardGetPassword[ValidatorPrivKey](prompt, 3,
proc (password: string): KsResult[ValidatorPrivKey] =
let decrypted = decryptKeystore(keystore, KeystorePass password)
if decrypted.isErr():
error "Keystore decryption failed. Please try again", keystorePath
decrypted
)
if res.isOk():
some(res.get())
else:
return
iterator validatorKeysFromDirs*(validatorsDir, secretsDir: string): ValidatorPrivKey =
try:
for kind, file in walkDir(validatorsDir):
if kind == pcDir:
let keyName = splitFile(file).name
let key = loadKeystore(validatorsDir, secretsDir, keyName, true)
if key.isSome:
yield key.get
else:
quit 1
except OSError:
quit 1
iterator validatorKeys*(conf: BeaconNodeConf|ValidatorClientConf): ValidatorPrivKey =
for validatorKeyFile in conf.validators:
try:
yield validatorKeyFile.load
except CatchableError as err:
error "Failed to load validator private key",
file = validatorKeyFile.string, err = err.msg
quit 1
let validatorsDir = conf.validatorsDir
try:
for kind, file in walkDir(validatorsDir):
if kind == pcDir:
let keyName = splitFile(file).name
let key = loadKeystore(validatorsDir, conf.secretsDir, keyName, conf.nonInteractive)
if key.isSome:
yield key.get
else:
quit 1
except OSError as err:
error "Validator keystores directory not accessible",
path = validatorsDir, err = err.msg
quit 1
type
KeystoreGenerationError = enum
RandomSourceDepleted,
FailedToCreateValidatorDir
FailedToCreateSecretsDir
FailedToCreateSecretFile
FailedToCreateKeystoreFile
proc loadNetKeystore*(keyStorePath: string,
insecurePwd: Option[string]): Option[lcrypto.PrivateKey] =
if not(checkSensitiveFilePermissions(keystorePath)):
error "Network keystorage file has insecure permissions",
key_path = keyStorePath
return
let keyStore =
try:
Json.loadFile(keystorePath, NetKeystore)
except IOError as err:
error "Failed to read network keystore", err = err.msg,
path = keystorePath
return
except SerializationError as err:
error "Invalid network keystore", err = err.formatMsg(keystorePath)
return
if insecurePwd.isSome():
warn "Using insecure password to unlock networking key"
let decrypted = decryptNetKeystore(keystore, KeystorePass insecurePwd.get())
if decrypted.isOk:
return some(decrypted.get())
else:
error "Network keystore decryption failed", key_store = keyStorePath
return
else:
let prompt = "Please enter passphrase to unlock networking key: "
let res = keyboardGetPassword[lcrypto.PrivateKey](prompt, 3,
proc (password: string): KsResult[lcrypto.PrivateKey] =
let decrypted = decryptNetKeystore(keystore, KeystorePass password)
if decrypted.isErr():
error "Keystore decryption failed. Please try again", keystorePath
decrypted
)
if res.isOk():
some(res.get())
else:
return
proc saveNetKeystore*(rng: var BrHmacDrbgContext, keyStorePath: string,
netKey: lcrypto.PrivateKey, insecurePwd: Option[string]
): Result[void, KeystoreGenerationError] =
let password =
if insecurePwd.isSome():
warn "Using insecure password to lock networking key",
key_path = keyStorePath
insecurePwd.get()
else:
let prompt = "Please enter NEW password to lock network key storage: "
let confirm = "Please confirm, network key storage password: "
let res = keyboardCreatePassword(prompt, confirm)
if res.isErr():
return err(FailedToCreateKeystoreFile)
res.get()
let keyStore = createNetKeystore(kdfScrypt, rng, netKey,
KeystorePass password)
var encodedStorage: string
try:
encodedStorage = Json.encode(keyStore)
except SerializationError:
error "Could not serialize network key storage", key_path = keyStorePath
return err(FailedToCreateKeystoreFile)
let res = writeFile(keyStorePath, encodedStorage, 0o600)
if res.isOk():
ok()
else:
error "Could not write to network key storage file", key_path = keyStorePath
err(FailedToCreateKeystoreFile)
proc saveKeystore(rng: var BrHmacDrbgContext,
validatorsDir, secretsDir: string,
signingKey: ValidatorPrivKey, signingPubKey: ValidatorPubKey,
signingKeyPath: KeyPath): Result[void, KeystoreGenerationError] =
let
keyName = "0x" & $signingPubKey
validatorDir = validatorsDir / keyName
if not existsDir(validatorDir):
var password = KeystorePass ncrutils.toHex(getRandomBytes(rng, 32))
defer: burnMem(password)
let
keyStore = createKeystore(kdfPbkdf2, rng, signingKey,
password, signingKeyPath)
keystoreFile = validatorDir / keystoreFileName
var encodedStorage: string
try:
encodedStorage = Json.encode(keyStore)
except SerializationError:
error "Could not serialize keystorage", key_path = keystoreFile
return err(FailedToCreateKeystoreFile)
let vres = createPath(validatorDir, 0o750)
if vres.isErr():
return err(FailedToCreateValidatorDir)
let sres = createPath(secretsDir, 0o750)
if sres.isErr():
return err(FailedToCreateSecretsDir)
let swres = writeFile(secretsDir / keyName, string(password), 0o600)
if swres.isErr():
return err(FailedToCreateSecretFile)
let kwres = writeFile(keystoreFile, encodedStorage, 0o600)
if kwres.isErr():
return err(FailedToCreateKeystoreFile)
ok()
proc generateDeposits*(preset: RuntimePreset,
rng: var BrHmacDrbgContext,
mnemonic: Mnemonic,
firstValidatorIdx, totalNewValidators: int,
validatorsDir: string,
secretsDir: string): Result[seq[DepositData], KeystoreGenerationError] =
var deposits: seq[DepositData]
notice "Generating deposits", totalNewValidators, validatorsDir, secretsDir
let withdrawalKeyPath = makeKeyPath(0, withdrawalKeyKind)
# TODO: Explain why we are using an empty password
var withdrawalKey = keyFromPath(mnemonic, KeystorePass"", withdrawalKeyPath)
defer: burnMem(withdrawalKey)
let withdrawalPubKey = withdrawalKey.toPubKey
for i in 0 ..< totalNewValidators:
let keyStoreIdx = firstValidatorIdx + i
let signingKeyPath = withdrawalKeyPath.append keyStoreIdx
var signingKey = deriveChildKey(withdrawalKey, keyStoreIdx)
defer: burnMem(signingKey)
let signingPubKey = signingKey.toPubKey
? saveKeystore(rng, validatorsDir, secretsDir,
signingKey, signingPubKey, signingKeyPath)
deposits.add preset.prepareDeposit(withdrawalPubKey, signingKey, signingPubKey)
ok deposits
proc saveWallet*(wallet: Wallet, outWalletPath: string): Result[void, string] =
let walletDir = splitFile(outWalletPath).dir
var encodedWallet: string
try:
encodedWallet = Json.encode(wallet, pretty = true)
except SerializationError:
return err("Could not serialize wallet")
let pres = createPath(walletDir, 0o750)
if pres.isErr():
return err("Could not create wallet directory [" & walletDir & "]")
let wres = writeFile(outWalletPath, encodedWallet, 0o600)
if wres.isErr():
return err("Could not write wallet to file [" & outWalletPath & "]")
ok()
proc saveWallet*(wallet: WalletPathPair): Result[void, string] =
saveWallet(wallet.wallet, wallet.path)
proc readPasswordInput(prompt: string, password: var TaintedString): bool =
try:
when defined(windows):
# readPasswordFromStdin() on Windows always returns `false`.
# https://github.com/nim-lang/Nim/issues/15207
discard readPasswordFromStdin(prompt, password)
true
else:
readPasswordFromStdin(prompt, password)
except IOError:
false
proc setStyleNoError(styles: set[Style]) =
when defined(windows):
try: stdout.setStyle(styles)
except: discard
else:
try: stdout.setStyle(styles)
except IOError, ValueError: discard
proc setForegroundColorNoError(color: ForegroundColor) =
when defined(windows):
try: stdout.setForegroundColor(color)
except: discard
else:
try: stdout.setForegroundColor(color)
except IOError, ValueError: discard
proc resetAttributesNoError() =
when defined(windows):
try: stdout.resetAttributes()
except: discard
else:
try: stdout.resetAttributes()
except IOError: discard
proc importKeystoresFromDir*(rng: var BrHmacDrbgContext,
importedDir, validatorsDir, secretsDir: string) =
var password: TaintedString
defer: burnMem(password)
try:
for file in walkDirRec(importedDir):
let ext = splitFile(file).ext
if toLowerAscii(ext) != ".json":
continue
let keystore =
try:
Json.loadFile(file, Keystore)
except SerializationError as e:
warn "Invalid keystore", err = e.formatMsg(file)
continue
except IOError as e:
warn "Failed to read keystore file", file, err = e.msg
continue
var firstDecryptionAttempt = true
while true:
var secret = decryptCryptoField(keystore.crypto, KeystorePass password)
if secret.len == 0:
if firstDecryptionAttempt:
try:
const msg = "Please enter the password for decrypting '$1' " &
"or press ENTER to skip importing this keystore"
echo msg % [file]
except ValueError:
raiseAssert "The format string above is correct"
else:
echo "The entered password was incorrect. Please try again."
firstDecryptionAttempt = false
if not readPasswordInput("Password: ", password):
echo "System error while entering password. Please try again."
if password.len == 0:
break
else:
let privKey = ValidatorPrivKey.fromRaw(secret)
if privKey.isOk:
let pubKey = privKey.value.toPubKey
let status = saveKeystore(rng, validatorsDir, secretsDir,
privKey.value, pubKey,
keystore.path)
if status.isOk:
notice "Keystore imported", file
else:
error "Failed to import keystore", file, err = status.error
else:
error "Imported keystore holds invalid key", file, err = privKey.error
break
except OSError:
fatal "Failed to access the imported deposits directory"
quit 1
template ask(prompt: string): string =
try:
stdout.write prompt, ": "
stdin.readLine()
except IOError:
return err "failure to read data from stdin"
proc pickPasswordAndSaveWallet(rng: var BrHmacDrbgContext,
config: BeaconNodeConf,
mnemonic: Mnemonic): Result[WalletPathPair, string] =
echo ""
echo80 "When you perform operations with your wallet such as withdrawals " &
"and additional deposits, you'll be asked to enter a password. " &
"Please note that this password is local to the current Nimbus " &
"installation and can be changed at any time."
echo ""
var password =
block:
let prompt = "Please enter a password: "
let confirm = "Please repeat the password: "
let res = keyboardCreatePassword(prompt, confirm)
if res.isErr():
return err($res.error)
res.get()
var name: WalletName
let outWalletName = config.outWalletName
if outWalletName.isSome:
name = outWalletName.get
else:
echo ""
echo80 "For your convenience, the wallet can be identified with a name " &
"of your choice. Please enter a wallet name below or press ENTER " &
"to continue with a machine-generated name."
while true:
var enteredName = ask "Wallet name"
if enteredName.len > 0:
name =
try:
WalletName.parseCmdArg(enteredName)
except CatchableError as err:
echo err.msg & ". Please try again."
continue
break
let nextAccount =
if config.cmd == wallets and config.walletsCmd == WalletsCmd.restore:
config.restoredDepositsCount
else:
none Natural
let wallet = createWallet(kdfPbkdf2, rng, mnemonic,
name = name,
nextAccount = nextAccount,
password = KeystorePass password)
let outWalletFileFlag = config.outWalletFile
let outWalletFile =
if outWalletFileFlag.isSome:
string outWalletFileFlag.get
else:
config.walletsDir / addFileExt(string wallet.uuid, "json")
let status = saveWallet(wallet, outWalletFile)
if status.isErr:
burnMem(password)
return err("failure to create wallet file due to " & status.error)
info "Wallet file written", path = outWalletFile
burnMem(password)
return ok WalletPathPair(wallet: wallet, path: outWalletFile)
proc createWalletInteractively*(
rng: var BrHmacDrbgContext,
config: BeaconNodeConf): Result[CreatedWallet, string] =
if config.nonInteractive:
return err "not running in interactive mode"
var mnemonic = generateMnemonic(rng)
defer: burnMem(mnemonic)
echo80 "The generated wallet is uniquely identified by a seed phrase " &
"consisting of 24 words. In case you lose your wallet and you " &
"need to restore it on a different machine, you must use the " &
"words displayed below:"
try:
echo ""
setStyleNoError({styleBright})
setForegroundColorNoError fgCyan
echo80 $mnemonic
resetAttributesNoError()
echo ""
except IOError, ValueError:
return err "failure to write to the standard output"
echo80 "Please back up the seed phrase now to a safe location as " &
"if you are protecting a sensitive password. The seed phrase " &
"can be used to withdraw funds from your wallet."
echo ""
echo "Did you back up your seed recovery phrase?\p" &
"(please type 'yes' to continue or press enter to quit)"
while true:
let answer = ask "Answer"
if answer == "":
return err "aborted wallet creation"
elif answer != "yes":
echo "To continue, please type 'yes' (without the quotes) or press enter to quit"
else:
break
let walletPath = ? pickPasswordAndSaveWallet(rng, config, mnemonic)
return ok CreatedWallet(walletPath: walletPath, mnemonic: mnemonic)
proc restoreWalletInteractively*(rng: var BrHmacDrbgContext,
config: BeaconNodeConf) =
var
enteredMnemonic: TaintedString
validatedMnemonic: Mnemonic
defer:
burnMem enteredMnemonic
burnMem validatedMnemonic
echo "To restore your wallet, please enter your backed-up seed phrase."
while true:
if not readPasswordInput("Seedphrase: ", enteredMnemonic):
fatal "failure to read password from stdin"
quit 1
if validateMnemonic(enteredMnemonic, validatedMnemonic):
break
else:
echo "The entered mnemonic was not valid. Please try again."
discard pickPasswordAndSaveWallet(rng, config, validatedMnemonic)
proc loadWallet*(fileName: string): Result[Wallet, string] =
try:
ok Json.loadFile(fileName, Wallet)
except IOError as exc:
err exc.msg
except SerializationError as exc:
err exc.msg
proc unlockWalletInteractively*(wallet: Wallet): Result[Mnemonic, string] =
let prompt = "Please enter the password for unlocking the wallet: "
echo "Please enter the password for unlocking the wallet"
let res = keyboardGetPassword[Mnemonic](prompt, 3,
proc (password: string): KsResult[Mnemonic] =
var secret = decryptCryptoField(wallet.crypto, KeystorePass password)
if len(secret) > 0:
let mnemonic = Mnemonic(string.fromBytes(secret))
burnMem(secret)
ok(mnemonic)
else:
let failed = "Unlocking of the wallet failed. Please try again"
echo failed
err(failed)
)
if res.isOk():
ok(res.get())
else:
err "Unlocking of the wallet failed."
proc findWallet*(config: BeaconNodeConf,
name: WalletName): Result[WalletPathPair, string] =
var walletFiles = newSeq[string]()
try:
for kind, walletFile in walkDir(config.walletsDir):
if kind != pcFile: continue
let walletId = splitFile(walletFile).name
if cmpIgnoreCase(walletId, name.string) == 0:
let wallet = ? loadWallet(walletFile)
return ok WalletPathPair(wallet: wallet, path: walletFile)
walletFiles.add walletFile
except OSError:
return err "failure to list wallet directory"
for walletFile in walletFiles:
let wallet = ? loadWallet(walletFile)
if cmpIgnoreCase(wallet.name.string, name.string) == 0:
return ok WalletPathPair(wallet: wallet, path: walletFile)
return err "failure to locate wallet file"
type
# This is not particularly well-standardized yet.
# Some relevant code for generating (1) and validating (2) the data can be found below:
# 1) https://github.com/ethereum/eth2.0-deposit-cli/blob/dev/eth2deposit/credentials.py
# 2) https://github.com/ethereum/eth2.0-deposit/blob/dev/src/pages/UploadValidator/validateDepositKey.ts
LaunchPadDeposit* = object
pubkey*: ValidatorPubKey
withdrawal_credentials*: Eth2Digest
amount*: Gwei
signature*: ValidatorSig
deposit_message_root*: Eth2Digest
deposit_data_root*: Eth2Digest
fork_version*: Version
func init*(T: type LaunchPadDeposit,
preset: RuntimePreset, d: DepositData): T =
T(pubkey: d.pubkey,
withdrawal_credentials: d.withdrawal_credentials,
amount: d.amount,
signature: d.signature,
deposit_message_root: hash_tree_root(d as DepositMessage),
deposit_data_root: hash_tree_root(d),
fork_version: preset.GENESIS_FORK_VERSION)
func `as`*(copied: LaunchPadDeposit, T: type DepositData): T =
T(pubkey: copied.pubkey,
withdrawal_credentials: copied.withdrawal_credentials,
amount: copied.amount,
signature: copied.signature)