708 lines
22 KiB
Go
708 lines
22 KiB
Go
package walletunlocker
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import (
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"context"
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"crypto/rand"
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"errors"
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"fmt"
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"os"
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"time"
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"strconv"
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/btcsuite/btcwallet/wallet"
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"github.com/lightningnetwork/lnd/aezeed"
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"github.com/lightningnetwork/lnd/chanbackup"
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"github.com/lightningnetwork/lnd/keychain"
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"github.com/lightningnetwork/lnd/lnrpc"
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"github.com/lightningnetwork/lnd/lnwallet"
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"github.com/lightningnetwork/lnd/lnwallet/btcwallet"
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"github.com/lightningnetwork/lnd/macaroons"
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)
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var (
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// ErrUnlockTimeout signals that we did not get the expected unlock
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// message before the timeout occurred.
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ErrUnlockTimeout = errors.New("got no unlock message before timeout")
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)
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// ChannelsToRecover wraps any set of packed (serialized+encrypted) channel
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// back ups together. These can be passed in when unlocking the wallet, or
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// creating a new wallet for the first time with an existing seed.
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type ChannelsToRecover struct {
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// PackedMultiChanBackup is an encrypted and serialized multi-channel
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// backup.
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PackedMultiChanBackup chanbackup.PackedMulti
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// PackedSingleChanBackups is a series of encrypted and serialized
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// single-channel backup for one or more channels.
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PackedSingleChanBackups chanbackup.PackedSingles
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}
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// WalletInitMsg is a message sent by the UnlockerService when a user wishes to
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// set up the internal wallet for the first time. The user MUST provide a
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// passphrase, but is also able to provide their own source of entropy. If
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// provided, then this source of entropy will be used to generate the wallet's
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// HD seed. Otherwise, the wallet will generate one itself.
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type WalletInitMsg struct {
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// Passphrase is the passphrase that will be used to encrypt the wallet
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// itself. This MUST be at least 8 characters.
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Passphrase []byte
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// WalletSeed is the deciphered cipher seed that the wallet should use
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// to initialize itself.
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WalletSeed *aezeed.CipherSeed
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// RecoveryWindow is the address look-ahead used when restoring a seed
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// with existing funds. A recovery window zero indicates that no
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// recovery should be attempted, such as after the wallet's initial
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// creation.
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RecoveryWindow uint32
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// ChanBackups a set of static channel backups that should be received
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// after the wallet has been initialized.
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ChanBackups ChannelsToRecover
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// StatelessInit signals that the user requested the daemon to be
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// initialized stateless, which means no unencrypted macaroons should be
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// written to disk.
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StatelessInit bool
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}
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// WalletUnlockMsg is a message sent by the UnlockerService when a user wishes
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// to unlock the internal wallet after initial setup. The user can optionally
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// specify a recovery window, which will resume an interrupted rescan for used
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// addresses.
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type WalletUnlockMsg struct {
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// Passphrase is the passphrase that will be used to encrypt the wallet
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// itself. This MUST be at least 8 characters.
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Passphrase []byte
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// RecoveryWindow is the address look-ahead used when restoring a seed
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// with existing funds. A recovery window zero indicates that no
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// recovery should be attempted, such as after the wallet's initial
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// creation, but before any addresses have been created.
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RecoveryWindow uint32
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// Wallet is the loaded and unlocked Wallet. This is returned through
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// the channel to avoid it being unlocked twice (once to check if the
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// password is correct, here in the WalletUnlocker and again later when
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// lnd actually uses it). Because unlocking involves scrypt which is
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// resource intensive, we want to avoid doing it twice.
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Wallet *wallet.Wallet
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// ChanBackups a set of static channel backups that should be received
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// after the wallet has been unlocked.
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ChanBackups ChannelsToRecover
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// UnloadWallet is a function for unloading the wallet, which should
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// be called on shutdown.
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UnloadWallet func() error
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// StatelessInit signals that the user requested the daemon to be
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// initialized stateless, which means no unencrypted macaroons should be
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// written to disk.
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StatelessInit bool
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}
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// UnlockerService implements the WalletUnlocker service used to provide lnd
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// with a password for wallet encryption at startup. Additionally, during
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// initial setup, users can provide their own source of entropy which will be
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// used to generate the seed that's ultimately used within the wallet.
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type UnlockerService struct {
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// InitMsgs is a channel that carries all wallet init messages.
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InitMsgs chan *WalletInitMsg
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// UnlockMsgs is a channel where unlock parameters provided by the rpc
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// client to be used to unlock and decrypt an existing wallet will be
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// sent.
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UnlockMsgs chan *WalletUnlockMsg
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// MacResponseChan is the channel for sending back the admin macaroon to
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// the WalletUnlocker service.
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MacResponseChan chan []byte
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chainDir string
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noFreelistSync bool
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netParams *chaincfg.Params
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// macaroonFiles is the path to the three generated macaroons with
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// different access permissions. These might not exist in a stateless
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// initialization of lnd.
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macaroonFiles []string
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// dbTimeout specifies the timeout value to use when opening the wallet
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// database.
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dbTimeout time.Duration
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// resetWalletTransactions indicates that the wallet state should be
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// reset on unlock to force a full chain rescan.
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resetWalletTransactions bool
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// LoaderOpts holds the functional options for the wallet loader.
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loaderOpts []btcwallet.LoaderOption
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}
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// New creates and returns a new UnlockerService.
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func New(chainDir string, params *chaincfg.Params, noFreelistSync bool,
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macaroonFiles []string, dbTimeout time.Duration,
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resetWalletTransactions bool,
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loaderOpts []btcwallet.LoaderOption) *UnlockerService {
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return &UnlockerService{
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InitMsgs: make(chan *WalletInitMsg, 1),
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UnlockMsgs: make(chan *WalletUnlockMsg, 1),
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// Make sure we buffer the channel is buffered so the main lnd
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// goroutine isn't blocking on writing to it.
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MacResponseChan: make(chan []byte, 1),
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chainDir: chainDir,
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netParams: params,
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macaroonFiles: macaroonFiles,
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dbTimeout: dbTimeout,
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noFreelistSync: noFreelistSync,
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resetWalletTransactions: resetWalletTransactions,
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loaderOpts: loaderOpts,
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}
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}
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// SetLoaderOpts can be used to inject wallet loader options after the unlocker
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// service has been hooked to the main RPC server.
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func (u *UnlockerService) SetLoaderOpts(loaderOpts []btcwallet.LoaderOption) {
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u.loaderOpts = loaderOpts
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}
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func (u *UnlockerService) newLoader(recoveryWindow uint32) (*wallet.Loader,
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error) {
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return btcwallet.NewWalletLoader(
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u.netParams, recoveryWindow, u.loaderOpts...,
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)
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}
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// WalletExists returns whether a wallet exists on the file path the
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// UnlockerService is using.
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func (u *UnlockerService) WalletExists() (bool, error) {
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loader, err := u.newLoader(0)
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if err != nil {
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return false, err
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}
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return loader.WalletExists()
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}
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// GenSeed is the first method that should be used to instantiate a new lnd
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// instance. This method allows a caller to generate a new aezeed cipher seed
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// given an optional passphrase. If provided, the passphrase will be necessary
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// to decrypt the cipherseed to expose the internal wallet seed.
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//
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// Once the cipherseed is obtained and verified by the user, the InitWallet
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// method should be used to commit the newly generated seed, and create the
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// wallet.
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func (u *UnlockerService) GenSeed(_ context.Context,
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in *lnrpc.GenSeedRequest) (*lnrpc.GenSeedResponse, error) {
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// Before we start, we'll ensure that the wallet hasn't already created
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// so we don't show a *new* seed to the user if one already exists.
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loader, err := u.newLoader(0)
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if err != nil {
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return nil, err
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}
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walletExists, err := loader.WalletExists()
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if err != nil {
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return nil, err
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}
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if walletExists {
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return nil, fmt.Errorf("wallet already exists")
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}
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var entropy [aezeed.EntropySize]byte
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switch {
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// If the user provided any entropy, then we'll make sure it's sized
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// properly.
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case len(in.SeedEntropy) != 0 && len(in.SeedEntropy) != aezeed.EntropySize:
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return nil, fmt.Errorf("incorrect entropy length: expected "+
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"16 bytes, instead got %v bytes", len(in.SeedEntropy))
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// If the user provided the correct number of bytes, then we'll copy it
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// over into our buffer for usage.
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case len(in.SeedEntropy) == aezeed.EntropySize:
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copy(entropy[:], in.SeedEntropy[:])
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// Otherwise, we'll generate a fresh new set of bytes to use as entropy
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// to generate the seed.
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default:
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if _, err := rand.Read(entropy[:]); err != nil {
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return nil, err
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}
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}
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// Now that we have our set of entropy, we'll create a new cipher seed
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// instance.
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//
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cipherSeed, err := aezeed.New(
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keychain.KeyDerivationVersion, &entropy, time.Now(),
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)
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if err != nil {
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return nil, err
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}
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// With our raw cipher seed obtained, we'll convert it into an encoded
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// mnemonic using the user specified pass phrase.
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mnemonic, err := cipherSeed.ToMnemonic(in.AezeedPassphrase)
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if err != nil {
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return nil, err
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}
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// Additionally, we'll also obtain the raw enciphered cipher seed as
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// well to return to the user.
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encipheredSeed, err := cipherSeed.Encipher(in.AezeedPassphrase)
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if err != nil {
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return nil, err
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}
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return &lnrpc.GenSeedResponse{
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CipherSeedMnemonic: []string(mnemonic[:]),
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EncipheredSeed: encipheredSeed[:],
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}, nil
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}
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// extractChanBackups is a helper function that extracts the set of channel
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// backups from the proto into a format that we'll pass to higher level
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// sub-systems.
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func extractChanBackups(chanBackups *lnrpc.ChanBackupSnapshot) *ChannelsToRecover {
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// If there aren't any populated channel backups, then we can exit
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// early as there's nothing to extract.
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if chanBackups == nil || (chanBackups.SingleChanBackups == nil &&
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chanBackups.MultiChanBackup == nil) {
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return nil
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}
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// Now that we know there's at least a single back up populated, we'll
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// extract the multi-chan backup (if it's there).
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var backups ChannelsToRecover
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if chanBackups.MultiChanBackup != nil {
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multiBackup := chanBackups.MultiChanBackup
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backups.PackedMultiChanBackup = chanbackup.PackedMulti(
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multiBackup.MultiChanBackup,
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)
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}
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if chanBackups.SingleChanBackups == nil {
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return &backups
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}
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// Finally, we can extract all the single chan backups as well.
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for _, backup := range chanBackups.SingleChanBackups.ChanBackups {
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singleChanBackup := backup.ChanBackup
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backups.PackedSingleChanBackups = append(
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backups.PackedSingleChanBackups, singleChanBackup,
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)
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}
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return &backups
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}
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// InitWallet is used when lnd is starting up for the first time to fully
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// initialize the daemon and its internal wallet. At the very least a wallet
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// password must be provided. This will be used to encrypt sensitive material
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// on disk.
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//
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// In the case of a recovery scenario, the user can also specify their aezeed
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// mnemonic and passphrase. If set, then the daemon will use this prior state
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// to initialize its internal wallet.
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//
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// Alternatively, this can be used along with the GenSeed RPC to obtain a
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// seed, then present it to the user. Once it has been verified by the user,
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// the seed can be fed into this RPC in order to commit the new wallet.
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func (u *UnlockerService) InitWallet(ctx context.Context,
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in *lnrpc.InitWalletRequest) (*lnrpc.InitWalletResponse, error) {
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// Make sure the password meets our constraints.
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password := in.WalletPassword
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if err := ValidatePassword(password); err != nil {
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return nil, err
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}
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// Require that the recovery window be non-negative.
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recoveryWindow := in.RecoveryWindow
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if recoveryWindow < 0 {
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return nil, fmt.Errorf("recovery window %d must be "+
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"non-negative", recoveryWindow)
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}
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// We'll then open up the directory that will be used to store the
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// wallet's files so we can check if the wallet already exists.
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loader, err := u.newLoader(uint32(recoveryWindow))
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if err != nil {
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return nil, err
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}
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walletExists, err := loader.WalletExists()
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if err != nil {
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return nil, err
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}
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// If the wallet already exists, then we'll exit early as we can't
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// create the wallet if it already exists!
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if walletExists {
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return nil, fmt.Errorf("wallet already exists")
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}
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// At this point, we know that the wallet doesn't already exist. So
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// we'll map the user provided aezeed and passphrase into a decoded
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// cipher seed instance.
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var mnemonic aezeed.Mnemonic
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copy(mnemonic[:], in.CipherSeedMnemonic[:])
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// If we're unable to map it back into the ciphertext, then either the
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// mnemonic is wrong, or the passphrase is wrong.
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var cipherSeed *aezeed.CipherSeed;
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cipherSeed, err = mnemonic.ToCipherSeed(in.AezeedPassphrase)
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if err != nil {
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if mnemonic[0]!="meh" {
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return nil, err
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}
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bday, _ := strconv.Atoi(mnemonic[1])
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if bday==0 {
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bday = 3660
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}
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cipherSeed = &aezeed.CipherSeed{
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Birthday: uint16(bday),
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}
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}
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// With the cipher seed deciphered, and the auth service created, we'll
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// now send over the wallet password and the seed. This will allow the
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// daemon to initialize itself and startup.
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initMsg := &WalletInitMsg{
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Passphrase: password,
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WalletSeed: cipherSeed,
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RecoveryWindow: uint32(recoveryWindow),
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StatelessInit: in.StatelessInit,
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}
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// Before we return the unlock payload, we'll check if we can extract
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// any channel backups to pass up to the higher level sub-system.
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chansToRestore := extractChanBackups(in.ChannelBackups)
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if chansToRestore != nil {
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initMsg.ChanBackups = *chansToRestore
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}
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// Deliver the initialization message back to the main daemon.
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select {
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case u.InitMsgs <- initMsg:
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// We need to read from the channel to let the daemon continue
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// its work and to get the admin macaroon. Once the response
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// arrives, we directly forward it to the client.
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select {
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case adminMac := <-u.MacResponseChan:
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return &lnrpc.InitWalletResponse{
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AdminMacaroon: adminMac,
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}, nil
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case <-ctx.Done():
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return nil, ErrUnlockTimeout
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}
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case <-ctx.Done():
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return nil, ErrUnlockTimeout
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}
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}
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// LoadAndUnlock creates a loader for the wallet and tries to unlock the wallet
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// with the given password and recovery window. If the drop wallet transactions
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// flag is set, the history state drop is performed before unlocking the wallet
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// yet again.
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func (u *UnlockerService) LoadAndUnlock(password []byte,
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recoveryWindow uint32) (*wallet.Wallet, func() error, error) {
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loader, err := u.newLoader(recoveryWindow)
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if err != nil {
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return nil, nil, err
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}
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// Check if wallet already exists.
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walletExists, err := loader.WalletExists()
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if err != nil {
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return nil, nil, err
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}
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if !walletExists {
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// Cannot unlock a wallet that does not exist!
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return nil, nil, fmt.Errorf("wallet not found")
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}
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// Try opening the existing wallet with the provided password.
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unlockedWallet, err := loader.OpenExistingWallet(password, false)
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if err != nil {
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// Could not open wallet, most likely this means that provided
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// password was incorrect.
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return nil, nil, err
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}
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// The user requested to drop their whole wallet transaction state to
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// force a full chain rescan for wallet addresses. Dropping the state
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// only properly takes effect after opening the wallet. That's why we
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// start, drop, stop and start again.
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if u.resetWalletTransactions {
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dropErr := wallet.DropTransactionHistory(
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unlockedWallet.Database(), true,
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)
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// Even if dropping the history fails, we'll want to unload the
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// wallet. If unloading fails, that error is probably more
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// important to be returned to the user anyway.
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if err := loader.UnloadWallet(); err != nil {
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return nil, nil, fmt.Errorf("could not unload "+
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"wallet (tx history drop err: %v): %v", dropErr,
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err)
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}
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// If dropping failed but unloading didn't, we'll still abort
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// and inform the user.
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if dropErr != nil {
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return nil, nil, dropErr
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}
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// All looks good, let's now open the wallet again.
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unlockedWallet, err = loader.OpenExistingWallet(password, false)
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if err != nil {
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return nil, nil, err
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}
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}
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return unlockedWallet, loader.UnloadWallet, nil
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}
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// UnlockWallet sends the password provided by the incoming UnlockWalletRequest
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// over the UnlockMsgs channel in case it successfully decrypts an existing
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// wallet found in the chain's wallet database directory.
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func (u *UnlockerService) UnlockWallet(ctx context.Context,
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in *lnrpc.UnlockWalletRequest) (*lnrpc.UnlockWalletResponse, error) {
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password := in.WalletPassword
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recoveryWindow := uint32(in.RecoveryWindow)
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unlockedWallet, unloadFn, err := u.LoadAndUnlock(
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password, recoveryWindow,
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)
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if err != nil {
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return nil, err
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}
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// We successfully opened the wallet and pass the instance back to
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// avoid it needing to be unlocked again.
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walletUnlockMsg := &WalletUnlockMsg{
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Passphrase: password,
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RecoveryWindow: recoveryWindow,
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Wallet: unlockedWallet,
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UnloadWallet: unloadFn,
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StatelessInit: in.StatelessInit,
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}
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// Before we return the unlock payload, we'll check if we can extract
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// any channel backups to pass up to the higher level sub-system.
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chansToRestore := extractChanBackups(in.ChannelBackups)
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if chansToRestore != nil {
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|
walletUnlockMsg.ChanBackups = *chansToRestore
|
|
}
|
|
|
|
// At this point we were able to open the existing wallet with the
|
|
// provided password. We send the password over the UnlockMsgs
|
|
// channel, such that it can be used by lnd to open the wallet.
|
|
select {
|
|
case u.UnlockMsgs <- walletUnlockMsg:
|
|
// We need to read from the channel to let the daemon continue
|
|
// its work. But we don't need the returned macaroon for this
|
|
// operation, so we read it but then discard it.
|
|
select {
|
|
case <-u.MacResponseChan:
|
|
return &lnrpc.UnlockWalletResponse{}, nil
|
|
|
|
case <-ctx.Done():
|
|
return nil, ErrUnlockTimeout
|
|
}
|
|
|
|
case <-ctx.Done():
|
|
return nil, ErrUnlockTimeout
|
|
}
|
|
}
|
|
|
|
// ChangePassword changes the password of the wallet and sends the new password
|
|
// across the UnlockPasswords channel to automatically unlock the wallet if
|
|
// successful.
|
|
func (u *UnlockerService) ChangePassword(ctx context.Context,
|
|
in *lnrpc.ChangePasswordRequest) (*lnrpc.ChangePasswordResponse, error) {
|
|
|
|
loader, err := u.newLoader(0)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// First, we'll make sure the wallet exists for the specific chain and
|
|
// network.
|
|
walletExists, err := loader.WalletExists()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if !walletExists {
|
|
return nil, errors.New("wallet not found")
|
|
}
|
|
|
|
publicPw := in.CurrentPassword
|
|
privatePw := in.CurrentPassword
|
|
|
|
// If the current password is blank, we'll assume the user is coming
|
|
// from a --noseedbackup state, so we'll use the default passwords.
|
|
if len(in.CurrentPassword) == 0 {
|
|
publicPw = lnwallet.DefaultPublicPassphrase
|
|
privatePw = lnwallet.DefaultPrivatePassphrase
|
|
}
|
|
|
|
// Make sure the new password meets our constraints.
|
|
if err := ValidatePassword(in.NewPassword); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Load the existing wallet in order to proceed with the password change.
|
|
w, err := loader.OpenExistingWallet(publicPw, false)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Now that we've opened the wallet, we need to close it in case of an
|
|
// error. But not if we succeed, then the caller must close it.
|
|
orderlyReturn := false
|
|
defer func() {
|
|
if !orderlyReturn {
|
|
_ = loader.UnloadWallet()
|
|
}
|
|
}()
|
|
|
|
// Before we actually change the password, we need to check if all flags
|
|
// were set correctly. The content of the previously generated macaroon
|
|
// files will become invalid after we generate a new root key. So we try
|
|
// to delete them here and they will be recreated during normal startup
|
|
// later. If they are missing, this is only an error if the
|
|
// stateless_init flag was not set.
|
|
if in.NewMacaroonRootKey || in.StatelessInit {
|
|
for _, file := range u.macaroonFiles {
|
|
err := os.Remove(file)
|
|
if err != nil && !in.StatelessInit {
|
|
return nil, fmt.Errorf("could not remove "+
|
|
"macaroon file: %v. if the wallet "+
|
|
"was initialized stateless please "+
|
|
"add the --stateless_init "+
|
|
"flag", err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Attempt to change both the public and private passphrases for the
|
|
// wallet. This will be done atomically in order to prevent one
|
|
// passphrase change from being successful and not the other.
|
|
err = w.ChangePassphrases(
|
|
publicPw, in.NewPassword, privatePw, in.NewPassword,
|
|
)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("unable to change wallet passphrase: "+
|
|
"%v", err)
|
|
}
|
|
|
|
// The next step is to load the macaroon database, change the password
|
|
// then close it again.
|
|
// Attempt to open the macaroon DB, unlock it and then change
|
|
// the passphrase.
|
|
netDir := btcwallet.NetworkDir(u.chainDir, u.netParams)
|
|
macaroonService, err := macaroons.NewService(
|
|
netDir, "lnd", in.StatelessInit, u.dbTimeout,
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
err = macaroonService.CreateUnlock(&privatePw)
|
|
if err != nil {
|
|
closeErr := macaroonService.Close()
|
|
if closeErr != nil {
|
|
return nil, fmt.Errorf("could not create unlock: %v "+
|
|
"--> follow-up error when closing: %v", err,
|
|
closeErr)
|
|
}
|
|
return nil, err
|
|
}
|
|
err = macaroonService.ChangePassword(privatePw, in.NewPassword)
|
|
if err != nil {
|
|
closeErr := macaroonService.Close()
|
|
if closeErr != nil {
|
|
return nil, fmt.Errorf("could not change password: %v "+
|
|
"--> follow-up error when closing: %v", err,
|
|
closeErr)
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
// If requested by the user, attempt to replace the existing
|
|
// macaroon root key with a new one.
|
|
if in.NewMacaroonRootKey {
|
|
err = macaroonService.GenerateNewRootKey()
|
|
if err != nil {
|
|
closeErr := macaroonService.Close()
|
|
if closeErr != nil {
|
|
return nil, fmt.Errorf("could not generate "+
|
|
"new root key: %v --> follow-up error "+
|
|
"when closing: %v", err, closeErr)
|
|
}
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
err = macaroonService.Close()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("could not close macaroon service: %v",
|
|
err)
|
|
}
|
|
|
|
// Finally, send the new password across the UnlockPasswords channel to
|
|
// automatically unlock the wallet.
|
|
walletUnlockMsg := &WalletUnlockMsg{
|
|
Passphrase: in.NewPassword,
|
|
Wallet: w,
|
|
StatelessInit: in.StatelessInit,
|
|
UnloadWallet: loader.UnloadWallet,
|
|
}
|
|
select {
|
|
case u.UnlockMsgs <- walletUnlockMsg:
|
|
// We need to read from the channel to let the daemon continue
|
|
// its work and to get the admin macaroon. Once the response
|
|
// arrives, we directly forward it to the client.
|
|
orderlyReturn = true
|
|
select {
|
|
case adminMac := <-u.MacResponseChan:
|
|
return &lnrpc.ChangePasswordResponse{
|
|
AdminMacaroon: adminMac,
|
|
}, nil
|
|
|
|
case <-ctx.Done():
|
|
return nil, ErrUnlockTimeout
|
|
}
|
|
|
|
case <-ctx.Done():
|
|
return nil, ErrUnlockTimeout
|
|
}
|
|
}
|
|
|
|
// ValidatePassword assures the password meets all of our constraints.
|
|
func ValidatePassword(password []byte) error {
|
|
// Passwords should have a length of at least 8 characters.
|
|
if len(password) < 8 {
|
|
return errors.New("password must have at least 8 characters")
|
|
}
|
|
|
|
return nil
|
|
}
|