plugeth/signer/core/uiapi.go

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// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
//
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// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
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// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
//
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// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"context"
"encoding/json"
"errors"
"fmt"
"math/big"
"os"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/crypto"
)
// UIServerAPI implements methods Clef provides for a UI to query, in the bidirectional communication
// channel.
// This API is considered secure, since a request can only
// ever arrive from the UI -- and the UI is capable of approving any action, thus we can consider these
// requests pre-approved.
// NB: It's very important that these methods are not ever exposed on the external service
// registry.
type UIServerAPI struct {
extApi *SignerAPI
am *accounts.Manager
}
// NewUIServerAPI creates a new UIServerAPI
func NewUIServerAPI(extapi *SignerAPI) *UIServerAPI {
return &UIServerAPI{extapi, extapi.am}
}
// List available accounts. As opposed to the external API definition, this method delivers
// the full Account object and not only Address.
// Example call
// {"jsonrpc":"2.0","method":"clef_listAccounts","params":[], "id":4}
func (s *UIServerAPI) ListAccounts(ctx context.Context) ([]accounts.Account, error) {
var accs []accounts.Account
for _, wallet := range s.am.Wallets() {
accs = append(accs, wallet.Accounts()...)
}
return accs, nil
}
// rawWallet is a JSON representation of an accounts.Wallet interface, with its
// data contents extracted into plain fields.
type rawWallet struct {
URL string `json:"url"`
Status string `json:"status"`
Failure string `json:"failure,omitempty"`
Accounts []accounts.Account `json:"accounts,omitempty"`
}
// ListWallets will return a list of wallets that clef manages
// Example call
// {"jsonrpc":"2.0","method":"clef_listWallets","params":[], "id":5}
func (s *UIServerAPI) ListWallets() []rawWallet {
wallets := make([]rawWallet, 0) // return [] instead of nil if empty
for _, wallet := range s.am.Wallets() {
status, failure := wallet.Status()
raw := rawWallet{
URL: wallet.URL().String(),
Status: status,
Accounts: wallet.Accounts(),
}
if failure != nil {
raw.Failure = failure.Error()
}
wallets = append(wallets, raw)
}
return wallets
}
// DeriveAccount requests a HD wallet to derive a new account, optionally pinning
// it for later reuse.
// Example call
// {"jsonrpc":"2.0","method":"clef_deriveAccount","params":["ledger://","m/44'/60'/0'", false], "id":6}
func (s *UIServerAPI) DeriveAccount(url string, path string, pin *bool) (accounts.Account, error) {
wallet, err := s.am.Wallet(url)
if err != nil {
return accounts.Account{}, err
}
derivPath, err := accounts.ParseDerivationPath(path)
if err != nil {
return accounts.Account{}, err
}
if pin == nil {
pin = new(bool)
}
return wallet.Derive(derivPath, *pin)
}
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// fetchKeystore retrieves the encrypted keystore from the account manager.
func fetchKeystore(am *accounts.Manager) *keystore.KeyStore {
ks := am.Backends(keystore.KeyStoreType)
if len(ks) == 0 {
return nil
}
return ks[0].(*keystore.KeyStore)
}
// ImportRawKey stores the given hex encoded ECDSA key into the key directory,
// encrypting it with the passphrase.
// Example call (should fail on password too short)
// {"jsonrpc":"2.0","method":"clef_importRawKey","params":["1111111111111111111111111111111111111111111111111111111111111111","test"], "id":6}
func (s *UIServerAPI) ImportRawKey(privkey string, password string) (accounts.Account, error) {
key, err := crypto.HexToECDSA(privkey)
if err != nil {
return accounts.Account{}, err
}
if err := ValidatePasswordFormat(password); err != nil {
return accounts.Account{}, fmt.Errorf("password requirements not met: %v", err)
}
// No error
return fetchKeystore(s.am).ImportECDSA(key, password)
}
// OpenWallet initiates a hardware wallet opening procedure, establishing a USB
// connection and attempting to authenticate via the provided passphrase. Note,
// the method may return an extra challenge requiring a second open (e.g. the
// Trezor PIN matrix challenge).
// Example
// {"jsonrpc":"2.0","method":"clef_openWallet","params":["ledger://",""], "id":6}
func (s *UIServerAPI) OpenWallet(url string, passphrase *string) error {
wallet, err := s.am.Wallet(url)
if err != nil {
return err
}
pass := ""
if passphrase != nil {
pass = *passphrase
}
return wallet.Open(pass)
}
// ChainId returns the chainid in use for Eip-155 replay protection
// Example call
// {"jsonrpc":"2.0","method":"clef_chainId","params":[], "id":8}
func (s *UIServerAPI) ChainId() math.HexOrDecimal64 {
return (math.HexOrDecimal64)(s.extApi.chainID.Uint64())
}
// SetChainId sets the chain id to use when signing transactions.
// Example call to set Ropsten:
// {"jsonrpc":"2.0","method":"clef_setChainId","params":["3"], "id":8}
func (s *UIServerAPI) SetChainId(id math.HexOrDecimal64) math.HexOrDecimal64 {
s.extApi.chainID = new(big.Int).SetUint64(uint64(id))
return s.ChainId()
}
// Export returns encrypted private key associated with the given address in web3 keystore format.
// Example
// {"jsonrpc":"2.0","method":"clef_export","params":["0x19e7e376e7c213b7e7e7e46cc70a5dd086daff2a"], "id":4}
func (s *UIServerAPI) Export(ctx context.Context, addr common.Address) (json.RawMessage, error) {
// Look up the wallet containing the requested signer
wallet, err := s.am.Find(accounts.Account{Address: addr})
if err != nil {
return nil, err
}
if wallet.URL().Scheme != keystore.KeyStoreScheme {
return nil, errors.New("account is not a keystore-account")
}
return os.ReadFile(wallet.URL().Path)
}
// Import tries to import the given keyJSON in the local keystore. The keyJSON data is expected to be
// in web3 keystore format. It will decrypt the keyJSON with the given passphrase and on successful
// decryption it will encrypt the key with the given newPassphrase and store it in the keystore.
// Example (the address in question has privkey `11...11`):
// {"jsonrpc":"2.0","method":"clef_import","params":[{"address":"19e7e376e7c213b7e7e7e46cc70a5dd086daff2a","crypto":{"cipher":"aes-128-ctr","ciphertext":"33e4cd3756091d037862bb7295e9552424a391a6e003272180a455ca2a9fb332","cipherparams":{"iv":"b54b263e8f89c42bb219b6279fba5cce"},"kdf":"scrypt","kdfparams":{"dklen":32,"n":262144,"p":1,"r":8,"salt":"e4ca94644fd30569c1b1afbbc851729953c92637b7fe4bb9840bbb31ffbc64a5"},"mac":"f4092a445c2b21c0ef34f17c9cd0d873702b2869ec5df4439a0c2505823217e7"},"id":"216c7eac-e8c1-49af-a215-fa0036f29141","version":3},"test","yaddayadda"], "id":4}
func (api *UIServerAPI) Import(ctx context.Context, keyJSON json.RawMessage, oldPassphrase, newPassphrase string) (accounts.Account, error) {
be := api.am.Backends(keystore.KeyStoreType)
if len(be) == 0 {
return accounts.Account{}, errors.New("password based accounts not supported")
}
if err := ValidatePasswordFormat(newPassphrase); err != nil {
return accounts.Account{}, fmt.Errorf("password requirements not met: %v", err)
}
return be[0].(*keystore.KeyStore).Import(keyJSON, oldPassphrase, newPassphrase)
}
// New creates a new password protected Account. The private key is protected with
// the given password. Users are responsible to backup the private key that is stored
// in the keystore location that was specified when this API was created.
// This method is the same as New on the external API, the difference being that
// this implementation does not ask for confirmation, since it's initiated by
// the user
func (api *UIServerAPI) New(ctx context.Context) (common.Address, error) {
return api.extApi.newAccount()
}
// Other methods to be added, not yet implemented are:
// - Ruleset interaction: add rules, attest rulefiles
// - Store metadata about accounts, e.g. naming of accounts