lnd.xprv/lnd.go
2020-05-11 15:38:56 -07:00

1109 lines
32 KiB
Go

// Copyright (c) 2013-2017 The btcsuite developers
// Copyright (c) 2015-2016 The Decred developers
// Copyright (C) 2015-2017 The Lightning Network Developers
package lnd
import (
"context"
"crypto/tls"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"path/filepath"
"runtime/pprof"
"strings"
"sync"
"time"
// Blank import to set up profiling HTTP handlers.
_ "net/http/pprof"
"gopkg.in/macaroon-bakery.v2/bakery"
"gopkg.in/macaroon.v2"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcutil"
"github.com/btcsuite/btcwallet/wallet"
proxy "github.com/grpc-ecosystem/grpc-gateway/runtime"
"github.com/lightninglabs/neutrino"
"github.com/lightningnetwork/lnd/autopilot"
"github.com/lightningnetwork/lnd/build"
"github.com/lightningnetwork/lnd/cert"
"github.com/lightningnetwork/lnd/chanacceptor"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/keychain"
"github.com/lightningnetwork/lnd/lncfg"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/lnwallet"
"github.com/lightningnetwork/lnd/lnwallet/btcwallet"
"github.com/lightningnetwork/lnd/macaroons"
"github.com/lightningnetwork/lnd/signal"
"github.com/lightningnetwork/lnd/tor"
"github.com/lightningnetwork/lnd/walletunlocker"
"github.com/lightningnetwork/lnd/watchtower"
"github.com/lightningnetwork/lnd/watchtower/wtdb"
)
var (
cfg *config
registeredChains = newChainRegistry()
// networkDir is the path to the directory of the currently active
// network. This path will hold the files related to each different
// network.
networkDir string
)
// WalletUnlockerAuthOptions returns a list of DialOptions that can be used to
// authenticate with the wallet unlocker service.
//
// NOTE: This should only be called after the WalletUnlocker listener has
// signaled it is ready.
func WalletUnlockerAuthOptions() ([]grpc.DialOption, error) {
creds, err := credentials.NewClientTLSFromFile(cfg.TLSCertPath, "")
if err != nil {
return nil, fmt.Errorf("unable to read TLS cert: %v", err)
}
// Create a dial options array with the TLS credentials.
opts := []grpc.DialOption{
grpc.WithTransportCredentials(creds),
}
return opts, nil
}
// AdminAuthOptions returns a list of DialOptions that can be used to
// authenticate with the RPC server with admin capabilities.
//
// NOTE: This should only be called after the RPCListener has signaled it is
// ready.
func AdminAuthOptions() ([]grpc.DialOption, error) {
creds, err := credentials.NewClientTLSFromFile(cfg.TLSCertPath, "")
if err != nil {
return nil, fmt.Errorf("unable to read TLS cert: %v", err)
}
// Create a dial options array.
opts := []grpc.DialOption{
grpc.WithTransportCredentials(creds),
}
// Get the admin macaroon if macaroons are active.
if !cfg.NoMacaroons {
// Load the adming macaroon file.
macBytes, err := ioutil.ReadFile(cfg.AdminMacPath)
if err != nil {
return nil, fmt.Errorf("unable to read macaroon "+
"path (check the network setting!): %v", err)
}
mac := &macaroon.Macaroon{}
if err = mac.UnmarshalBinary(macBytes); err != nil {
return nil, fmt.Errorf("unable to decode macaroon: %v",
err)
}
// Now we append the macaroon credentials to the dial options.
cred := macaroons.NewMacaroonCredential(mac)
opts = append(opts, grpc.WithPerRPCCredentials(cred))
}
return opts, nil
}
// ListenerWithSignal is a net.Listener that has an additional Ready channel that
// will be closed when a server starts listening.
type ListenerWithSignal struct {
net.Listener
// Ready will be closed by the server listening on Listener.
Ready chan struct{}
}
// ListenerCfg is a wrapper around custom listeners that can be passed to lnd
// when calling its main method.
type ListenerCfg struct {
// WalletUnlocker can be set to the listener to use for the wallet
// unlocker. If nil a regular network listener will be created.
WalletUnlocker *ListenerWithSignal
// RPCListener can be set to the listener to use for the RPC server. If
// nil a regular network listener will be created.
RPCListener *ListenerWithSignal
}
// rpcListeners is a function type used for closures that fetches a set of RPC
// listeners for the current configuration. If no custom listeners are present,
// this should return normal listeners from the RPC endpoints defined in the
// config. The second return value us a closure that will close the fetched
// listeners.
type rpcListeners func() ([]*ListenerWithSignal, func(), error)
// Main is the true entry point for lnd. This function is required since defers
// created in the top-level scope of a main method aren't executed if os.Exit()
// is called.
func Main(lisCfg ListenerCfg) error {
// Hook interceptor for os signals.
signal.Intercept()
// Load the configuration, and parse any command line options. This
// function will also set up logging properly.
loadedConfig, err := loadConfig()
if err != nil {
return err
}
cfg = loadedConfig
defer func() {
ltndLog.Info("Shutdown complete")
err := logWriter.Close()
if err != nil {
ltndLog.Errorf("Could not close log rotator: %v", err)
}
}()
// Show version at startup.
ltndLog.Infof("Version: %s commit=%s, build=%s, logging=%s",
build.Version(), build.Commit, build.Deployment,
build.LoggingType)
var network string
switch {
case cfg.Bitcoin.TestNet3 || cfg.Litecoin.TestNet3:
network = "testnet"
case cfg.Bitcoin.MainNet || cfg.Litecoin.MainNet:
network = "mainnet"
case cfg.Bitcoin.SimNet || cfg.Litecoin.SimNet:
network = "simnet"
case cfg.Bitcoin.RegTest || cfg.Litecoin.RegTest:
network = "regtest"
}
ltndLog.Infof("Active chain: %v (network=%v)",
strings.Title(registeredChains.PrimaryChain().String()),
network,
)
// Enable http profiling server if requested.
if cfg.Profile != "" {
go func() {
listenAddr := net.JoinHostPort("", cfg.Profile)
profileRedirect := http.RedirectHandler("/debug/pprof",
http.StatusSeeOther)
http.Handle("/", profileRedirect)
fmt.Println(http.ListenAndServe(listenAddr, nil))
}()
}
// Write cpu profile if requested.
if cfg.CPUProfile != "" {
f, err := os.Create(cfg.CPUProfile)
if err != nil {
err := fmt.Errorf("unable to create CPU profile: %v",
err)
ltndLog.Error(err)
return err
}
pprof.StartCPUProfile(f)
defer f.Close()
defer pprof.StopCPUProfile()
}
// Create the network-segmented directory for the channel database.
graphDir := filepath.Join(cfg.DataDir,
defaultGraphSubDirname,
normalizeNetwork(activeNetParams.Name))
ltndLog.Infof("Opening the main database, this might take a few " +
"minutes...")
// Open the channeldb, which is dedicated to storing channel, and
// network related metadata.
startOpenTime := time.Now()
chanDB, err := channeldb.Open(
graphDir,
channeldb.OptionSetRejectCacheSize(cfg.Caches.RejectCacheSize),
channeldb.OptionSetChannelCacheSize(cfg.Caches.ChannelCacheSize),
channeldb.OptionSetSyncFreelist(cfg.SyncFreelist),
channeldb.OptionDryRunMigration(cfg.DryRunMigration),
)
switch {
case err == channeldb.ErrDryRunMigrationOK:
ltndLog.Info("%v, exiting", err)
return nil
case err != nil:
ltndLog.Errorf("Unable to open channeldb: %v", err)
return err
}
defer chanDB.Close()
openTime := time.Since(startOpenTime)
ltndLog.Infof("Database now open (time_to_open=%v)!", openTime)
// Only process macaroons if --no-macaroons isn't set.
ctx := context.Background()
ctx, cancel := context.WithCancel(ctx)
defer cancel()
tlsCfg, restCreds, restProxyDest, err := getTLSConfig(
cfg.TLSCertPath, cfg.TLSKeyPath, cfg.TLSExtraIPs,
cfg.TLSExtraDomains, cfg.RPCListeners,
)
if err != nil {
err := fmt.Errorf("unable to load TLS credentials: %v", err)
ltndLog.Error(err)
return err
}
serverCreds := credentials.NewTLS(tlsCfg)
serverOpts := []grpc.ServerOption{grpc.Creds(serverCreds)}
// For our REST dial options, we'll still use TLS, but also increase
// the max message size that we'll decode to allow clients to hit
// endpoints which return more data such as the DescribeGraph call.
// We set this to 200MiB atm. Should be the same value as maxMsgRecvSize
// in cmd/lncli/main.go.
restDialOpts := []grpc.DialOption{
grpc.WithTransportCredentials(*restCreds),
grpc.WithDefaultCallOptions(
grpc.MaxCallRecvMsgSize(1 * 1024 * 1024 * 200),
),
}
// Before starting the wallet, we'll create and start our Neutrino
// light client instance, if enabled, in order to allow it to sync
// while the rest of the daemon continues startup.
mainChain := cfg.Bitcoin
if registeredChains.PrimaryChain() == litecoinChain {
mainChain = cfg.Litecoin
}
var neutrinoCS *neutrino.ChainService
if mainChain.Node == "neutrino" {
neutrinoBackend, neutrinoCleanUp, err := initNeutrinoBackend(
mainChain.ChainDir,
)
if err != nil {
err := fmt.Errorf("unable to initialize neutrino "+
"backend: %v", err)
ltndLog.Error(err)
return err
}
defer neutrinoCleanUp()
neutrinoCS = neutrinoBackend
}
var (
walletInitParams WalletUnlockParams
privateWalletPw = lnwallet.DefaultPrivatePassphrase
publicWalletPw = lnwallet.DefaultPublicPassphrase
)
// If the user didn't request a seed, then we'll manually assume a
// wallet birthday of now, as otherwise the seed would've specified
// this information.
walletInitParams.Birthday = time.Now()
// getListeners is a closure that creates listeners from the
// RPCListeners defined in the config. It also returns a cleanup
// closure and the server options to use for the GRPC server.
getListeners := func() ([]*ListenerWithSignal, func(), error) {
var grpcListeners []*ListenerWithSignal
for _, grpcEndpoint := range cfg.RPCListeners {
// Start a gRPC server listening for HTTP/2
// connections.
lis, err := lncfg.ListenOnAddress(grpcEndpoint)
if err != nil {
ltndLog.Errorf("unable to listen on %s",
grpcEndpoint)
return nil, nil, err
}
grpcListeners = append(
grpcListeners, &ListenerWithSignal{
Listener: lis,
Ready: make(chan struct{}),
})
}
cleanup := func() {
for _, lis := range grpcListeners {
lis.Close()
}
}
return grpcListeners, cleanup, nil
}
// walletUnlockerListeners is a closure we'll hand to the wallet
// unlocker, that will be called when it needs listeners for its GPRC
// server.
walletUnlockerListeners := func() ([]*ListenerWithSignal, func(),
error) {
// If we have chosen to start with a dedicated listener for the
// wallet unlocker, we return it directly.
if lisCfg.WalletUnlocker != nil {
return []*ListenerWithSignal{lisCfg.WalletUnlocker},
func() {}, nil
}
// Otherwise we'll return the regular listeners.
return getListeners()
}
// We wait until the user provides a password over RPC. In case lnd is
// started with the --noseedbackup flag, we use the default password
// for wallet encryption.
if !cfg.NoSeedBackup {
params, err := waitForWalletPassword(
cfg.RESTListeners, serverOpts, restDialOpts,
restProxyDest, tlsCfg, walletUnlockerListeners,
)
if err != nil {
err := fmt.Errorf("unable to set up wallet password "+
"listeners: %v", err)
ltndLog.Error(err)
return err
}
walletInitParams = *params
privateWalletPw = walletInitParams.Password
publicWalletPw = walletInitParams.Password
if walletInitParams.RecoveryWindow > 0 {
ltndLog.Infof("Wallet recovery mode enabled with "+
"address lookahead of %d addresses",
walletInitParams.RecoveryWindow)
}
}
var macaroonService *macaroons.Service
if !cfg.NoMacaroons {
// Create the macaroon authentication/authorization service.
macaroonService, err = macaroons.NewService(
networkDir, macaroons.IPLockChecker,
)
if err != nil {
err := fmt.Errorf("unable to set up macaroon "+
"authentication: %v", err)
ltndLog.Error(err)
return err
}
defer macaroonService.Close()
// Try to unlock the macaroon store with the private password.
err = macaroonService.CreateUnlock(&privateWalletPw)
if err != nil {
err := fmt.Errorf("unable to unlock macaroons: %v", err)
ltndLog.Error(err)
return err
}
// Create macaroon files for lncli to use if they don't exist.
if !fileExists(cfg.AdminMacPath) && !fileExists(cfg.ReadMacPath) &&
!fileExists(cfg.InvoiceMacPath) {
err = genMacaroons(
ctx, macaroonService, cfg.AdminMacPath,
cfg.ReadMacPath, cfg.InvoiceMacPath,
)
if err != nil {
err := fmt.Errorf("unable to create macaroons "+
"%v", err)
ltndLog.Error(err)
return err
}
}
}
// With the information parsed from the configuration, create valid
// instances of the pertinent interfaces required to operate the
// Lightning Network Daemon.
activeChainControl, err := newChainControlFromConfig(
cfg, chanDB, privateWalletPw, publicWalletPw,
walletInitParams.Birthday, walletInitParams.RecoveryWindow,
walletInitParams.Wallet, neutrinoCS,
)
if err != nil {
err := fmt.Errorf("unable to create chain control: %v", err)
ltndLog.Error(err)
return err
}
// Finally before we start the server, we'll register the "holy
// trinity" of interface for our current "home chain" with the active
// chainRegistry interface.
primaryChain := registeredChains.PrimaryChain()
registeredChains.RegisterChain(primaryChain, activeChainControl)
// TODO(roasbeef): add rotation
idPrivKey, err := activeChainControl.wallet.DerivePrivKey(keychain.KeyDescriptor{
KeyLocator: keychain.KeyLocator{
Family: keychain.KeyFamilyNodeKey,
Index: 0,
},
})
if err != nil {
err := fmt.Errorf("unable to derive node private key: %v", err)
ltndLog.Error(err)
return err
}
idPrivKey.Curve = btcec.S256()
if cfg.Tor.Active {
srvrLog.Infof("Proxying all network traffic via Tor "+
"(stream_isolation=%v)! NOTE: Ensure the backend node "+
"is proxying over Tor as well", cfg.Tor.StreamIsolation)
}
// If the watchtower client should be active, open the client database.
// This is done here so that Close always executes when lndMain returns.
var towerClientDB *wtdb.ClientDB
if cfg.WtClient.Active {
var err error
towerClientDB, err = wtdb.OpenClientDB(graphDir)
if err != nil {
err := fmt.Errorf("unable to open watchtower client "+
"database: %v", err)
ltndLog.Error(err)
return err
}
defer towerClientDB.Close()
}
// If tor is active and either v2 or v3 onion services have been specified,
// make a tor controller and pass it into both the watchtower server and
// the regular lnd server.
var torController *tor.Controller
if cfg.Tor.Active && (cfg.Tor.V2 || cfg.Tor.V3) {
torController = tor.NewController(
cfg.Tor.Control, cfg.Tor.TargetIPAddress, cfg.Tor.Password,
)
// Start the tor controller before giving it to any other subsystems.
if err := torController.Start(); err != nil {
err := fmt.Errorf("unable to initialize tor controller: %v", err)
ltndLog.Error(err)
return err
}
defer func() {
if err := torController.Stop(); err != nil {
ltndLog.Errorf("error stopping tor controller: %v", err)
}
}()
}
var tower *watchtower.Standalone
if cfg.Watchtower.Active {
// Segment the watchtower directory by chain and network.
towerDBDir := filepath.Join(
cfg.Watchtower.TowerDir,
registeredChains.PrimaryChain().String(),
normalizeNetwork(activeNetParams.Name),
)
towerDB, err := wtdb.OpenTowerDB(towerDBDir)
if err != nil {
err := fmt.Errorf("unable to open watchtower "+
"database: %v", err)
ltndLog.Error(err)
return err
}
defer towerDB.Close()
towerPrivKey, err := activeChainControl.wallet.DerivePrivKey(
keychain.KeyDescriptor{
KeyLocator: keychain.KeyLocator{
Family: keychain.KeyFamilyTowerID,
Index: 0,
},
},
)
if err != nil {
err := fmt.Errorf("unable to derive watchtower "+
"private key: %v", err)
ltndLog.Error(err)
return err
}
wtCfg := &watchtower.Config{
BlockFetcher: activeChainControl.chainIO,
DB: towerDB,
EpochRegistrar: activeChainControl.chainNotifier,
Net: cfg.net,
NewAddress: func() (btcutil.Address, error) {
return activeChainControl.wallet.NewAddress(
lnwallet.WitnessPubKey, false,
)
},
NodePrivKey: towerPrivKey,
PublishTx: activeChainControl.wallet.PublishTransaction,
ChainHash: *activeNetParams.GenesisHash,
}
// If there is a tor controller (user wants auto hidden services), then
// store a pointer in the watchtower config.
if torController != nil {
wtCfg.TorController = torController
wtCfg.WatchtowerKeyPath = cfg.Tor.WatchtowerKeyPath
switch {
case cfg.Tor.V2:
wtCfg.Type = tor.V2
case cfg.Tor.V3:
wtCfg.Type = tor.V3
}
}
wtConfig, err := cfg.Watchtower.Apply(wtCfg, lncfg.NormalizeAddresses)
if err != nil {
err := fmt.Errorf("unable to configure watchtower: %v",
err)
ltndLog.Error(err)
return err
}
tower, err = watchtower.New(wtConfig)
if err != nil {
err := fmt.Errorf("unable to create watchtower: %v", err)
ltndLog.Error(err)
return err
}
}
// Initialize the ChainedAcceptor.
chainedAcceptor := chanacceptor.NewChainedAcceptor()
// Set up the core server which will listen for incoming peer
// connections.
server, err := newServer(
cfg.Listeners, chanDB, towerClientDB, activeChainControl,
idPrivKey, walletInitParams.ChansToRestore, chainedAcceptor,
torController,
)
if err != nil {
err := fmt.Errorf("unable to create server: %v", err)
ltndLog.Error(err)
return err
}
// Set up an autopilot manager from the current config. This will be
// used to manage the underlying autopilot agent, starting and stopping
// it at will.
atplCfg, err := initAutoPilot(server, cfg.Autopilot, mainChain)
if err != nil {
err := fmt.Errorf("unable to initialize autopilot: %v", err)
ltndLog.Error(err)
return err
}
atplManager, err := autopilot.NewManager(atplCfg)
if err != nil {
err := fmt.Errorf("unable to create autopilot manager: %v", err)
ltndLog.Error(err)
return err
}
if err := atplManager.Start(); err != nil {
err := fmt.Errorf("unable to start autopilot manager: %v", err)
ltndLog.Error(err)
return err
}
defer atplManager.Stop()
// rpcListeners is a closure we'll hand to the rpc server, that will be
// called when it needs listeners for its GPRC server.
rpcListeners := func() ([]*ListenerWithSignal, func(), error) {
// If we have chosen to start with a dedicated listener for the
// rpc server, we return it directly.
if lisCfg.RPCListener != nil {
return []*ListenerWithSignal{lisCfg.RPCListener},
func() {}, nil
}
// Otherwise we'll return the regular listeners.
return getListeners()
}
// Initialize, and register our implementation of the gRPC interface
// exported by the rpcServer.
rpcServer, err := newRPCServer(
server, macaroonService, cfg.SubRPCServers, serverOpts,
restDialOpts, restProxyDest, atplManager, server.invoices,
tower, tlsCfg, rpcListeners, chainedAcceptor,
)
if err != nil {
err := fmt.Errorf("unable to create RPC server: %v", err)
ltndLog.Error(err)
return err
}
if err := rpcServer.Start(); err != nil {
err := fmt.Errorf("unable to start RPC server: %v", err)
ltndLog.Error(err)
return err
}
defer rpcServer.Stop()
// If we're not in regtest or simnet mode, We'll wait until we're fully
// synced to continue the start up of the remainder of the daemon. This
// ensures that we don't accept any possibly invalid state transitions, or
// accept channels with spent funds.
if !(cfg.Bitcoin.RegTest || cfg.Bitcoin.SimNet ||
cfg.Litecoin.RegTest || cfg.Litecoin.SimNet) {
_, bestHeight, err := activeChainControl.chainIO.GetBestBlock()
if err != nil {
err := fmt.Errorf("unable to determine chain tip: %v",
err)
ltndLog.Error(err)
return err
}
ltndLog.Infof("Waiting for chain backend to finish sync, "+
"start_height=%v", bestHeight)
for {
if !signal.Alive() {
return nil
}
synced, _, err := activeChainControl.wallet.IsSynced()
if err != nil {
err := fmt.Errorf("unable to determine if "+
"wallet is synced: %v", err)
ltndLog.Error(err)
return err
}
if synced {
break
}
time.Sleep(time.Second * 1)
}
_, bestHeight, err = activeChainControl.chainIO.GetBestBlock()
if err != nil {
err := fmt.Errorf("unable to determine chain tip: %v",
err)
ltndLog.Error(err)
return err
}
ltndLog.Infof("Chain backend is fully synced (end_height=%v)!",
bestHeight)
}
// With all the relevant chains initialized, we can finally start the
// server itself.
if err := server.Start(); err != nil {
err := fmt.Errorf("unable to start server: %v", err)
ltndLog.Error(err)
return err
}
defer server.Stop()
// Now that the server has started, if the autopilot mode is currently
// active, then we'll start the autopilot agent immediately. It will be
// stopped together with the autopilot service.
if cfg.Autopilot.Active {
if err := atplManager.StartAgent(); err != nil {
err := fmt.Errorf("unable to start autopilot agent: %v",
err)
ltndLog.Error(err)
return err
}
}
if cfg.Watchtower.Active {
if err := tower.Start(); err != nil {
err := fmt.Errorf("unable to start watchtower: %v", err)
ltndLog.Error(err)
return err
}
defer tower.Stop()
}
// Wait for shutdown signal from either a graceful server stop or from
// the interrupt handler.
<-signal.ShutdownChannel()
return nil
}
// getTLSConfig returns a TLS configuration for the gRPC server and credentials
// and a proxy destination for the REST reverse proxy.
func getTLSConfig(tlsCertPath string, tlsKeyPath string, tlsExtraIPs,
tlsExtraDomains []string, rpcListeners []net.Addr) (*tls.Config,
*credentials.TransportCredentials, string, error) {
// Ensure we create TLS key and certificate if they don't exist.
if !fileExists(tlsCertPath) && !fileExists(tlsKeyPath) {
rpcsLog.Infof("Generating TLS certificates...")
err := cert.GenCertPair(
"lnd autogenerated cert", tlsCertPath, tlsKeyPath,
tlsExtraIPs, tlsExtraDomains,
cert.DefaultAutogenValidity,
)
if err != nil {
return nil, nil, "", err
}
rpcsLog.Infof("Done generating TLS certificates")
}
certData, parsedCert, err := cert.LoadCert(tlsCertPath, tlsKeyPath)
if err != nil {
return nil, nil, "", err
}
// We check whether the certifcate we have on disk match the IPs and
// domains specified by the config. If the extra IPs or domains have
// changed from when the certificate was created, we will refresh the
// certificate if auto refresh is active.
refresh := false
if cfg.TLSAutoRefresh {
refresh, err = cert.IsOutdated(
parsedCert, tlsExtraIPs, tlsExtraDomains,
)
if err != nil {
return nil, nil, "", err
}
}
// If the certificate expired or it was outdated, delete it and the TLS
// key and generate a new pair.
if time.Now().After(parsedCert.NotAfter) || refresh {
ltndLog.Info("TLS certificate is expired or outdated, " +
"generating a new one")
err := os.Remove(tlsCertPath)
if err != nil {
return nil, nil, "", err
}
err = os.Remove(tlsKeyPath)
if err != nil {
return nil, nil, "", err
}
rpcsLog.Infof("Renewing TLS certificates...")
err = cert.GenCertPair(
"lnd autogenerated cert", tlsCertPath, tlsKeyPath,
tlsExtraIPs, tlsExtraDomains,
cert.DefaultAutogenValidity,
)
if err != nil {
return nil, nil, "", err
}
rpcsLog.Infof("Done renewing TLS certificates")
// Reload the certificate data.
certData, _, err = cert.LoadCert(tlsCertPath, tlsKeyPath)
if err != nil {
return nil, nil, "", err
}
}
tlsCfg := cert.TLSConfFromCert(certData)
restCreds, err := credentials.NewClientTLSFromFile(tlsCertPath, "")
if err != nil {
return nil, nil, "", err
}
restProxyDest := rpcListeners[0].String()
switch {
case strings.Contains(restProxyDest, "0.0.0.0"):
restProxyDest = strings.Replace(
restProxyDest, "0.0.0.0", "127.0.0.1", 1,
)
case strings.Contains(restProxyDest, "[::]"):
restProxyDest = strings.Replace(
restProxyDest, "[::]", "[::1]", 1,
)
}
return tlsCfg, &restCreds, restProxyDest, nil
}
// fileExists reports whether the named file or directory exists.
// This function is taken from https://github.com/btcsuite/btcd
func fileExists(name string) bool {
if _, err := os.Stat(name); err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}
// genMacaroons generates three macaroon files; one admin-level, one for
// invoice access and one read-only. These can also be used to generate more
// granular macaroons.
func genMacaroons(ctx context.Context, svc *macaroons.Service,
admFile, roFile, invoiceFile string) error {
// First, we'll generate a macaroon that only allows the caller to
// access invoice related calls. This is useful for merchants and other
// services to allow an isolated instance that can only query and
// modify invoices.
invoiceMac, err := svc.Oven.NewMacaroon(
ctx, bakery.LatestVersion, nil, invoicePermissions...,
)
if err != nil {
return err
}
invoiceMacBytes, err := invoiceMac.M().MarshalBinary()
if err != nil {
return err
}
err = ioutil.WriteFile(invoiceFile, invoiceMacBytes, 0644)
if err != nil {
os.Remove(invoiceFile)
return err
}
// Generate the read-only macaroon and write it to a file.
roMacaroon, err := svc.Oven.NewMacaroon(
ctx, bakery.LatestVersion, nil, readPermissions...,
)
if err != nil {
return err
}
roBytes, err := roMacaroon.M().MarshalBinary()
if err != nil {
return err
}
if err = ioutil.WriteFile(roFile, roBytes, 0644); err != nil {
os.Remove(admFile)
return err
}
// Generate the admin macaroon and write it to a file.
adminPermissions := append(readPermissions, writePermissions...)
admMacaroon, err := svc.Oven.NewMacaroon(
ctx, bakery.LatestVersion, nil, adminPermissions...,
)
if err != nil {
return err
}
admBytes, err := admMacaroon.M().MarshalBinary()
if err != nil {
return err
}
if err = ioutil.WriteFile(admFile, admBytes, 0600); err != nil {
return err
}
return nil
}
// WalletUnlockParams holds the variables used to parameterize the unlocking of
// lnd's wallet after it has already been created.
type WalletUnlockParams struct {
// Password is the public and private wallet passphrase.
Password []byte
// Birthday specifies the approximate time that this wallet was created.
// This is used to bound any rescans on startup.
Birthday time.Time
// RecoveryWindow specifies the address lookahead when entering recovery
// mode. A recovery will be attempted if this value is non-zero.
RecoveryWindow uint32
// Wallet is the loaded and unlocked Wallet. This is returned
// from the unlocker service to avoid it being unlocked twice (once in
// the unlocker service to check if the password is correct and again
// later when lnd actually uses it). Because unlocking involves scrypt
// which is resource intensive, we want to avoid doing it twice.
Wallet *wallet.Wallet
// ChansToRestore a set of static channel backups that should be
// restored before the main server instance starts up.
ChansToRestore walletunlocker.ChannelsToRecover
}
// waitForWalletPassword will spin up gRPC and REST endpoints for the
// WalletUnlocker server, and block until a password is provided by
// the user to this RPC server.
func waitForWalletPassword(restEndpoints []net.Addr,
serverOpts []grpc.ServerOption, restDialOpts []grpc.DialOption,
restProxyDest string, tlsConf *tls.Config,
getListeners rpcListeners) (*WalletUnlockParams, error) {
// Start a gRPC server listening for HTTP/2 connections, solely used
// for getting the encryption password from the client.
listeners, cleanup, err := getListeners()
if err != nil {
return nil, err
}
defer cleanup()
// Set up a new PasswordService, which will listen for passwords
// provided over RPC.
grpcServer := grpc.NewServer(serverOpts...)
defer grpcServer.GracefulStop()
chainConfig := cfg.Bitcoin
if registeredChains.PrimaryChain() == litecoinChain {
chainConfig = cfg.Litecoin
}
// The macaroon files are passed to the wallet unlocker since they are
// also encrypted with the wallet's password. These files will be
// deleted within it and recreated when successfully changing the
// wallet's password.
macaroonFiles := []string{
filepath.Join(networkDir, macaroons.DBFilename),
cfg.AdminMacPath, cfg.ReadMacPath, cfg.InvoiceMacPath,
}
pwService := walletunlocker.New(
chainConfig.ChainDir, activeNetParams.Params, !cfg.SyncFreelist,
macaroonFiles,
)
lnrpc.RegisterWalletUnlockerServer(grpcServer, pwService)
// Use a WaitGroup so we can be sure the instructions on how to input the
// password is the last thing to be printed to the console.
var wg sync.WaitGroup
for _, lis := range listeners {
wg.Add(1)
go func(lis *ListenerWithSignal) {
rpcsLog.Infof("password RPC server listening on %s",
lis.Addr())
// Close the ready chan to indicate we are listening.
close(lis.Ready)
wg.Done()
grpcServer.Serve(lis)
}(lis)
}
// Start a REST proxy for our gRPC server above.
ctx := context.Background()
ctx, cancel := context.WithCancel(ctx)
defer cancel()
mux := proxy.NewServeMux()
err = lnrpc.RegisterWalletUnlockerHandlerFromEndpoint(
ctx, mux, restProxyDest, restDialOpts,
)
if err != nil {
return nil, err
}
srv := &http.Server{Handler: mux}
for _, restEndpoint := range restEndpoints {
lis, err := lncfg.TLSListenOnAddress(restEndpoint, tlsConf)
if err != nil {
ltndLog.Errorf(
"password gRPC proxy unable to listen on %s",
restEndpoint,
)
return nil, err
}
defer lis.Close()
wg.Add(1)
go func() {
rpcsLog.Infof(
"password gRPC proxy started at %s",
lis.Addr(),
)
wg.Done()
srv.Serve(lis)
}()
}
// Wait for gRPC and REST servers to be up running.
wg.Wait()
// Wait for user to provide the password.
ltndLog.Infof("Waiting for wallet encryption password. Use `lncli " +
"create` to create a wallet, `lncli unlock` to unlock an " +
"existing wallet, or `lncli changepassword` to change the " +
"password of an existing wallet and unlock it.")
// We currently don't distinguish between getting a password to be used
// for creation or unlocking, as a new wallet db will be created if
// none exists when creating the chain control.
select {
// The wallet is being created for the first time, we'll check to see
// if the user provided any entropy for seed creation. If so, then
// we'll create the wallet early to load the seed.
case initMsg := <-pwService.InitMsgs:
password := initMsg.Passphrase
cipherSeed := initMsg.WalletSeed
recoveryWindow := initMsg.RecoveryWindow
// Before we proceed, we'll check the internal version of the
// seed. If it's greater than the current key derivation
// version, then we'll return an error as we don't understand
// this.
if cipherSeed.InternalVersion != keychain.KeyDerivationVersion {
return nil, fmt.Errorf("invalid internal seed version "+
"%v, current version is %v",
cipherSeed.InternalVersion,
keychain.KeyDerivationVersion)
}
netDir := btcwallet.NetworkDir(
chainConfig.ChainDir, activeNetParams.Params,
)
loader := wallet.NewLoader(
activeNetParams.Params, netDir, !cfg.SyncFreelist,
recoveryWindow,
)
// With the seed, we can now use the wallet loader to create
// the wallet, then pass it back to avoid unlocking it again.
birthday := cipherSeed.BirthdayTime()
newWallet, err := loader.CreateNewWallet(
password, password, cipherSeed.Entropy[:], birthday,
)
if err != nil {
// Don't leave the file open in case the new wallet
// could not be created for whatever reason.
if err := loader.UnloadWallet(); err != nil {
ltndLog.Errorf("Could not unload new "+
"wallet: %v", err)
}
return nil, err
}
return &WalletUnlockParams{
Password: password,
Birthday: birthday,
RecoveryWindow: recoveryWindow,
Wallet: newWallet,
ChansToRestore: initMsg.ChanBackups,
}, nil
// The wallet has already been created in the past, and is simply being
// unlocked. So we'll just return these passphrases.
case unlockMsg := <-pwService.UnlockMsgs:
return &WalletUnlockParams{
Password: unlockMsg.Passphrase,
RecoveryWindow: unlockMsg.RecoveryWindow,
Wallet: unlockMsg.Wallet,
ChansToRestore: unlockMsg.ChanBackups,
}, nil
case <-signal.ShutdownChannel():
return nil, fmt.Errorf("shutting down")
}
}