func performHandshakeAndValidation(conn *tls.Conn, uri *url.URL) error {
if err := conn.Handshake(); err != nil {
return err
}
cs := conn.ConnectionState()
if !cs.NegotiatedProtocolIsMutual || cs.NegotiatedProtocol != protocol.ProtocolName {
return fmt.Errorf("protocol negotiation error")
}
q := uri.Query()
relayIDs := q.Get("id")
if relayIDs != "" {
relayID, err := syncthingprotocol.DeviceIDFromString(relayIDs)
if err != nil {
return fmt.Errorf("relay address contains invalid verification id: %s", err)
}
certs := cs.PeerCertificates
if cl := len(certs); cl != 1 {
return fmt.Errorf("unexpected certificate count: %d", cl)
}
remoteID := syncthingprotocol.NewDeviceID(certs[0].Raw)
if remoteID != relayID {
return fmt.Errorf("relay id does not match. Expected %v got %v", relayID, remoteID)
}
}
return nil
}
func TestRelay(uri *url.URL, certs []tls.Certificate, sleep, timeout time.Duration, times int) bool {
id := syncthingprotocol.NewDeviceID(certs[0].Certificate[0])
invs := make(chan protocol.SessionInvitation, 1)
c, err := NewClient(uri, certs, invs, timeout)
if err != nil {
close(invs)
return false
}
go c.Serve()
defer func() {
c.Stop()
close(invs)
}()
for i := 0; i < times; i++ {
_, err := GetInvitationFromRelay(uri, id, certs, timeout)
if err == nil {
return true
}
if !strings.Contains(err.Error(), "Incorrect response code") {
return false
}
time.Sleep(sleep)
}
return false
}
func TestManyPeers(t *testing.T) {
log.Println("Cleaning...")
err := removeAll("s1", "s2", "h1/index*", "h2/index*")
if err != nil {
t.Fatal(err)
}
log.Println("Generating files...")
err = generateFiles("s1", 200, 20, "../LICENSE")
if err != nil {
t.Fatal(err)
}
receiver := startInstance(t, 2)
defer checkedStop(t, receiver)
bs, err := receiver.Get("/rest/system/config")
if err != nil {
t.Fatal(err)
}
var cfg config.Configuration
if err := json.Unmarshal(bs, &cfg); err != nil {
t.Fatal(err)
}
for len(cfg.Devices) < 100 {
bs := make([]byte, 16)
ReadRand(bs)
id := protocol.NewDeviceID(bs)
cfg.Devices = append(cfg.Devices, config.DeviceConfiguration{DeviceID: id})
cfg.Folders[0].Devices = append(cfg.Folders[0].Devices, config.FolderDeviceConfiguration{DeviceID: id})
}
osutil.Rename("h2/config.xml", "h2/config.xml.orig")
defer osutil.Rename("h2/config.xml.orig", "h2/config.xml")
var buf bytes.Buffer
json.NewEncoder(&buf).Encode(cfg)
_, err = receiver.Post("/rest/system/config", &buf)
if err != nil {
t.Fatal(err)
}
sender := startInstance(t, 1)
defer checkedStop(t, sender)
rc.AwaitSync("default", sender, receiver)
log.Println("Comparing directories...")
err = compareDirectories("s1", "s2")
if err != nil {
t.Fatal(err)
}
}
func generate(generateDir string) {
dir, err := osutil.ExpandTilde(generateDir)
if err != nil {
l.Fatalln("generate:", err)
}
ensureDir(dir, 0700)
certFile, keyFile := filepath.Join(dir, "cert.pem"), filepath.Join(dir, "key.pem")
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err == nil {
l.Warnln("Key exists; will not overwrite.")
l.Infoln("Device ID:", protocol.NewDeviceID(cert.Certificate[0]))
} else {
cert, err = tlsutil.NewCertificate(certFile, keyFile, tlsDefaultCommonName, bepRSABits)
if err != nil {
l.Fatalln("Create certificate:", err)
}
myID = protocol.NewDeviceID(cert.Certificate[0])
if err != nil {
l.Fatalln("Load certificate:", err)
}
if err == nil {
l.Infoln("Device ID:", protocol.NewDeviceID(cert.Certificate[0]))
}
}
cfgFile := filepath.Join(dir, "config.xml")
if _, err := os.Stat(cfgFile); err == nil {
l.Warnln("Config exists; will not overwrite.")
return
}
var myName, _ = os.Hostname()
var newCfg = defaultConfig(myName)
var cfg = config.Wrap(cfgFile, newCfg)
err = cfg.Save()
if err != nil {
l.Warnln("Failed to save config", err)
}
}
func (c *idCheckingHTTPClient) check(resp *http.Response) error {
if resp.TLS == nil {
return errors.New("security: not TLS")
}
if len(resp.TLS.PeerCertificates) == 0 {
return errors.New("security: no certificates")
}
id := protocol.NewDeviceID(resp.TLS.PeerCertificates[0].Raw)
if !id.Equals(c.id) {
return errors.New("security: incorrect device id")
}
return nil
}
func TestGlobalOverHTTPS(t *testing.T) {
dir, err := ioutil.TempDir("", "syncthing")
if err != nil {
t.Fatal(err)
}
// Generate a server certificate, using fewer bits than usual to hurry the
// process along a bit.
cert, err := tlsutil.NewCertificate(dir+"/cert.pem", dir+"/key.pem", "syncthing", 1024)
if err != nil {
t.Fatal(err)
}
list, err := tls.Listen("tcp4", "127.0.0.1:0", &tls.Config{Certificates: []tls.Certificate{cert}})
if err != nil {
t.Fatal(err)
}
defer list.Close()
s := new(fakeDiscoveryServer)
mux := http.NewServeMux()
mux.HandleFunc("/", s.handler)
go http.Serve(list, mux)
// With default options the lookup code expects the server certificate to
// check out according to the usual CA chains etc. That won't be the case
// here so we expect the lookup to fail.
url := "https://" + list.Addr().String()
if _, _, err := testLookup(url); err == nil {
t.Fatalf("unexpected nil error when we should have got a certificate error")
}
// With "insecure" set, whatever certificate is on the other side should
// be accepted.
url = "https://" + list.Addr().String() + "?insecure"
if direct, relays, err := testLookup(url); err != nil {
t.Fatalf("unexpected error: %v", err)
} else {
if len(direct) != 1 || direct[0] != "tcp://192.0.2.42::22000" {
t.Errorf("incorrect direct list: %+v", direct)
}
if len(relays) != 1 || relays[0] != (Relay{URL: "relay://192.0.2.43:443", Latency: 42}) {
t.Errorf("incorrect relays list: %+v", direct)
}
}
// With "id" set to something incorrect, the checks should fail again.
url = "https://" + list.Addr().String() + "?id=" + protocol.LocalDeviceID.String()
if _, _, err := testLookup(url); err == nil {
t.Fatalf("unexpected nil error for incorrect discovery server ID")
}
// With the correct device ID, the check should pass and we should get a
// lookup response.
id := protocol.NewDeviceID(cert.Certificate[0])
url = "https://" + list.Addr().String() + "?id=" + id.String()
if direct, relays, err := testLookup(url); err != nil {
t.Fatalf("unexpected error: %v", err)
} else {
if len(direct) != 1 || direct[0] != "tcp://192.0.2.42::22000" {
t.Errorf("incorrect direct list: %+v", direct)
}
if len(relays) != 1 || relays[0] != (Relay{URL: "relay://192.0.2.43:443", Latency: 42}) {
t.Errorf("incorrect relays list: %+v", direct)
}
}
}
func syncthingMain(runtimeOptions RuntimeOptions) {
setupSignalHandling()
// Create a main service manager. We'll add things to this as we go along.
// We want any logging it does to go through our log system.
mainService := suture.New("main", suture.Spec{
Log: func(line string) {
l.Debugln(line)
},
})
mainService.ServeBackground()
// Set a log prefix similar to the ID we will have later on, or early log
// lines look ugly.
l.SetPrefix("[start] ")
if runtimeOptions.auditEnabled {
startAuditing(mainService)
}
if runtimeOptions.verbose {
mainService.Add(newVerboseService())
}
errors := logger.NewRecorder(l, logger.LevelWarn, maxSystemErrors, 0)
systemLog := logger.NewRecorder(l, logger.LevelDebug, maxSystemLog, initialSystemLog)
// Event subscription for the API; must start early to catch the early events.
apiSub := events.NewBufferedSubscription(events.Default.Subscribe(events.AllEvents), 1000)
if len(os.Getenv("GOMAXPROCS")) == 0 {
runtime.GOMAXPROCS(runtime.NumCPU())
}
// Attempt to increase the limit on number of open files to the maximum
// allowed, in case we have many peers. We don't really care enough to
// report the error if there is one.
osutil.MaximizeOpenFileLimit()
// Ensure that that we have a certificate and key.
cert, err := tls.LoadX509KeyPair(locations[locCertFile], locations[locKeyFile])
if err != nil {
l.Infof("Generating ECDSA key and certificate for %s...", tlsDefaultCommonName)
cert, err = tlsutil.NewCertificate(locations[locCertFile], locations[locKeyFile], tlsDefaultCommonName, bepRSABits)
if err != nil {
l.Fatalln(err)
}
}
// We reinitialize the predictable RNG with our device ID, to get a
// sequence that is always the same but unique to this syncthing instance.
predictableRandom.Seed(seedFromBytes(cert.Certificate[0]))
myID = protocol.NewDeviceID(cert.Certificate[0])
l.SetPrefix(fmt.Sprintf("[%s] ", myID.String()[:5]))
l.Infoln(LongVersion)
l.Infoln("My ID:", myID)
printHashRate()
// Emit the Starting event, now that we know who we are.
events.Default.Log(events.Starting, map[string]string{
"home": baseDirs["config"],
"myID": myID.String(),
})
cfg := loadOrCreateConfig()
if err := checkShortIDs(cfg); err != nil {
l.Fatalln("Short device IDs are in conflict. Unlucky!\n Regenerate the device ID of one of the following:\n ", err)
}
if len(runtimeOptions.profiler) > 0 {
go func() {
l.Debugln("Starting profiler on", runtimeOptions.profiler)
runtime.SetBlockProfileRate(1)
err := http.ListenAndServe(runtimeOptions.profiler, nil)
if err != nil {
l.Fatalln(err)
}
}()
}
// The TLS configuration is used for both the listening socket and outgoing
// connections.
tlsCfg := &tls.Config{
Certificates: []tls.Certificate{cert},
NextProtos: []string{bepProtocolName},
ClientAuth: tls.RequestClientCert,
SessionTicketsDisabled: true,
InsecureSkipVerify: true,
MinVersion: tls.VersionTLS12,
CipherSuites: []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
},
}
// If the read or write rate should be limited, set up a rate limiter for it.
// This will be used on connections created in the connect and listen routines.
opts := cfg.Options()
if !opts.SymlinksEnabled {
symlinks.Supported = false
}
if (opts.MaxRecvKbps > 0 || opts.MaxSendKbps > 0) && !opts.LimitBandwidthInLan {
lans, _ = osutil.GetLans()
for _, lan := range opts.AlwaysLocalNets {
_, ipnet, err := net.ParseCIDR(lan)
if err != nil {
l.Infoln("Network", lan, "is malformed:", err)
continue
}
lans = append(lans, ipnet)
}
networks := make([]string, len(lans))
for i, lan := range lans {
networks[i] = lan.String()
}
l.Infoln("Local networks:", strings.Join(networks, ", "))
}
dbFile := locations[locDatabase]
ldb, err := db.Open(dbFile)
if err != nil {
l.Fatalln("Cannot open database:", err, "- Is another copy of Syncthing already running?")
}
protectedFiles := []string{
locations[locDatabase],
locations[locConfigFile],
locations[locCertFile],
locations[locKeyFile],
}
// Remove database entries for folders that no longer exist in the config
folders := cfg.Folders()
for _, folder := range ldb.ListFolders() {
if _, ok := folders[folder]; !ok {
l.Infof("Cleaning data for dropped folder %q", folder)
db.DropFolder(ldb, folder)
}
}
// Pack and optimize the database
if err := ldb.Compact(); err != nil {
// I don't think this is fatal, but who knows. If it is, we'll surely
// get an error when trying to write to the db later.
l.Infoln("Compacting database:", err)
}
m := model.NewModel(cfg, myID, myDeviceName(cfg), "syncthing", Version, ldb, protectedFiles)
cfg.Subscribe(m)
if t := os.Getenv("STDEADLOCKTIMEOUT"); len(t) > 0 {
it, err := strconv.Atoi(t)
if err == nil {
m.StartDeadlockDetector(time.Duration(it) * time.Second)
}
} else if !IsRelease || IsBeta {
m.StartDeadlockDetector(20 * time.Minute)
}
if runtimeOptions.paused {
for device := range cfg.Devices() {
m.PauseDevice(device)
}
}
// Clear out old indexes for other devices. Otherwise we'll start up and
// start needing a bunch of files which are nowhere to be found. This
// needs to be changed when we correctly do persistent indexes.
for _, folderCfg := range cfg.Folders() {
m.AddFolder(folderCfg)
for _, device := range folderCfg.DeviceIDs() {
if device == myID {
continue
}
m.Index(device, folderCfg.ID, nil, 0, nil)
}
// Routine to pull blocks from other devices to synchronize the local
// folder. Does not run when we are in read only (publish only) mode.
if folderCfg.ReadOnly {
m.StartFolderRO(folderCfg.ID)
} else {
m.StartFolderRW(folderCfg.ID)
}
}
mainService.Add(m)
// The default port we announce, possibly modified by setupUPnP next.
uri, err := url.Parse(opts.ListenAddress[0])
if err != nil {
l.Fatalf("Failed to parse listen address %s: %v", opts.ListenAddress[0], err)
}
addr, err := net.ResolveTCPAddr("tcp", uri.Host)
if err != nil {
l.Fatalln("Bad listen address:", err)
}
// The externalAddr tracks our external addresses for discovery purposes.
var addrList *addressLister
// Start UPnP
if opts.UPnPEnabled {
upnpService := newUPnPService(cfg, addr.Port)
mainService.Add(upnpService)
// The external address tracker needs to know about the UPnP service
// so it can check for an external mapped port.
addrList = newAddressLister(upnpService, cfg)
} else {
addrList = newAddressLister(nil, cfg)
}
// Start relay management
var relayService *relay.Service
if opts.RelaysEnabled {
relayService = relay.NewService(cfg, tlsCfg)
mainService.Add(relayService)
}
// Start discovery
cachedDiscovery := discover.NewCachingMux()
mainService.Add(cachedDiscovery)
if cfg.Options().GlobalAnnEnabled {
for _, srv := range cfg.GlobalDiscoveryServers() {
l.Infoln("Using discovery server", srv)
gd, err := discover.NewGlobal(srv, cert, addrList, relayService)
if err != nil {
l.Warnln("Global discovery:", err)
continue
}
// Each global discovery server gets its results cached for five
// minutes, and is not asked again for a minute when it's returned
// unsuccessfully.
cachedDiscovery.Add(gd, 5*time.Minute, time.Minute, globalDiscoveryPriority)
}
}
if cfg.Options().LocalAnnEnabled {
// v4 broadcasts
bcd, err := discover.NewLocal(myID, fmt.Sprintf(":%d", cfg.Options().LocalAnnPort), addrList, relayService)
if err != nil {
l.Warnln("IPv4 local discovery:", err)
} else {
cachedDiscovery.Add(bcd, 0, 0, ipv4LocalDiscoveryPriority)
}
// v6 multicasts
mcd, err := discover.NewLocal(myID, cfg.Options().LocalAnnMCAddr, addrList, relayService)
if err != nil {
l.Warnln("IPv6 local discovery:", err)
} else {
cachedDiscovery.Add(mcd, 0, 0, ipv6LocalDiscoveryPriority)
}
}
// GUI
setupGUI(mainService, cfg, m, apiSub, cachedDiscovery, relayService, errors, systemLog, runtimeOptions)
// Start connection management
connectionService := connections.NewConnectionService(cfg, myID, m, tlsCfg, cachedDiscovery, relayService, bepProtocolName, tlsDefaultCommonName, lans)
mainService.Add(connectionService)
if runtimeOptions.cpuProfile {
f, err := os.Create(fmt.Sprintf("cpu-%d.pprof", os.Getpid()))
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
}
for _, device := range cfg.Devices() {
if len(device.Name) > 0 {
l.Infof("Device %s is %q at %v", device.DeviceID, device.Name, device.Addresses)
}
}
if opts.URAccepted > 0 && opts.URAccepted < usageReportVersion {
l.Infoln("Anonymous usage report has changed; revoking acceptance")
opts.URAccepted = 0
opts.URUniqueID = ""
cfg.SetOptions(opts)
}
if opts.URAccepted >= usageReportVersion {
if opts.URUniqueID == "" {
// Previously the ID was generated from the node ID. We now need
// to generate a new one.
opts.URUniqueID = randomString(8)
cfg.SetOptions(opts)
cfg.Save()
}
}
// The usageReportingManager registers itself to listen to configuration
// changes, and there's nothing more we need to tell it from the outside.
// Hence we don't keep the returned pointer.
newUsageReportingManager(cfg, m)
if opts.RestartOnWakeup {
go standbyMonitor()
}
if opts.AutoUpgradeIntervalH > 0 {
if noUpgrade {
l.Infof("No automatic upgrades; STNOUPGRADE environment variable defined.")
} else if IsRelease {
go autoUpgrade(cfg)
} else {
l.Infof("No automatic upgrades; %s is not a release version.", Version)
}
}
events.Default.Log(events.StartupComplete, map[string]string{
"myID": myID.String(),
})
go generatePingEvents()
cleanConfigDirectory()
code := <-stop
mainService.Stop()
l.Infoln("Exiting")
if runtimeOptions.cpuProfile {
pprof.StopCPUProfile()
}
os.Exit(code)
}
func (s *connectionService) handle() {
next:
for c := range s.conns {
cs := c.Conn.ConnectionState()
// We should have negotiated the next level protocol "bep/1.0" as part
// of the TLS handshake. Unfortunately this can't be a hard error,
// because there are implementations out there that don't support
// protocol negotiation (iOS for one...).
if !cs.NegotiatedProtocolIsMutual || cs.NegotiatedProtocol != s.bepProtocolName {
l.Infof("Peer %s did not negotiate bep/1.0", c.Conn.RemoteAddr())
}
// We should have received exactly one certificate from the other
// side. If we didn't, they don't have a device ID and we drop the
// connection.
certs := cs.PeerCertificates
if cl := len(certs); cl != 1 {
l.Infof("Got peer certificate list of length %d != 1 from %s; protocol error", cl, c.Conn.RemoteAddr())
c.Conn.Close()
continue
}
remoteCert := certs[0]
remoteID := protocol.NewDeviceID(remoteCert.Raw)
// The device ID should not be that of ourselves. It can happen
// though, especially in the presence of NAT hairpinning, multiple
// clients between the same NAT gateway, and global discovery.
if remoteID == s.myID {
l.Infof("Connected to myself (%s) - should not happen", remoteID)
c.Conn.Close()
continue
}
// If we have a relay connection, and the new incoming connection is
// not a relay connection, we should drop that, and prefer the this one.
s.mut.RLock()
ct, ok := s.connType[remoteID]
s.mut.RUnlock()
if ok && !ct.IsDirect() && c.Type.IsDirect() {
l.Debugln("Switching connections", remoteID)
s.model.Close(remoteID, fmt.Errorf("switching connections"))
} else if s.model.ConnectedTo(remoteID) {
// We should not already be connected to the other party. TODO: This
// could use some better handling. If the old connection is dead but
// hasn't timed out yet we may want to drop *that* connection and keep
// this one. But in case we are two devices connecting to each other
// in parallel we don't want to do that or we end up with no
// connections still established...
l.Infof("Connected to already connected device (%s)", remoteID)
c.Conn.Close()
continue
} else if s.model.IsPaused(remoteID) {
l.Infof("Connection from paused device (%s)", remoteID)
c.Conn.Close()
continue
}
for deviceID, deviceCfg := range s.cfg.Devices() {
if deviceID == remoteID {
// Verify the name on the certificate. By default we set it to
// "syncthing" when generating, but the user may have replaced
// the certificate and used another name.
certName := deviceCfg.CertName
if certName == "" {
certName = s.tlsDefaultCommonName
}
err := remoteCert.VerifyHostname(certName)
if err != nil {
// Incorrect certificate name is something the user most
// likely wants to know about, since it's an advanced
// config. Warn instead of Info.
l.Warnf("Bad certificate from %s (%v): %v", remoteID, c.Conn.RemoteAddr(), err)
c.Conn.Close()
continue next
}
// If rate limiting is set, and based on the address we should
// limit the connection, then we wrap it in a limiter.
limit := s.shouldLimit(c.Conn.RemoteAddr())
wr := io.Writer(c.Conn)
if limit && s.writeRateLimit != nil {
wr = NewWriteLimiter(c.Conn, s.writeRateLimit)
}
rd := io.Reader(c.Conn)
if limit && s.readRateLimit != nil {
rd = NewReadLimiter(c.Conn, s.readRateLimit)
}
name := fmt.Sprintf("%s-%s (%s)", c.Conn.LocalAddr(), c.Conn.RemoteAddr(), c.Type)
protoConn := protocol.NewConnection(remoteID, rd, wr, s.model, name, deviceCfg.Compression)
l.Infof("Established secure connection to %s at %s", remoteID, name)
l.Debugf("cipher suite: %04X in lan: %t", c.Conn.ConnectionState().CipherSuite, !limit)
s.model.AddConnection(model.Connection{
c.Conn,
protoConn,
c.Type,
})
s.mut.Lock()
s.connType[remoteID] = c.Type
s.mut.Unlock()
continue next
}
}
if !s.cfg.IgnoredDevice(remoteID) {
events.Default.Log(events.DeviceRejected, map[string]string{
"device": remoteID.String(),
"address": c.Conn.RemoteAddr().String(),
})
}
l.Infof("Connection from %s (%s) with ignored device ID %s", c.Conn.RemoteAddr(), c.Type, remoteID)
c.Conn.Close()
}
}