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