mirror of
https://github.com/tailscale/tailscale.git
synced 2025-10-31 00:01:40 +01:00
ce752b8a88
The callback itself is not removed as it is used in other repos, making it simpler for those to slowly transition to the eventbus. Updates #15160 Signed-off-by: Claus Lensbøl <claus@tailscale.com>
685 lines
18 KiB
Go
685 lines
18 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// The wasm package builds a WebAssembly module that provides a subset of
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// Tailscale APIs to JavaScript.
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//
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// When run in the browser, a newIPN(config) function is added to the global JS
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// namespace. When called it returns an ipn object with the methods
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// run(callbacks), login(), logout(), and ssh(...).
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package main
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import (
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"bytes"
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"context"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"log"
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"math/rand/v2"
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"net"
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"net/http"
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"net/netip"
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"strings"
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"syscall/js"
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"time"
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"golang.org/x/crypto/ssh"
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"tailscale.com/control/controlclient"
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"tailscale.com/ipn"
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"tailscale.com/ipn/ipnauth"
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"tailscale.com/ipn/ipnlocal"
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"tailscale.com/ipn/ipnserver"
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"tailscale.com/ipn/store/mem"
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"tailscale.com/logpolicy"
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"tailscale.com/logtail"
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"tailscale.com/net/netns"
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"tailscale.com/net/tsdial"
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"tailscale.com/safesocket"
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"tailscale.com/tailcfg"
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"tailscale.com/tsd"
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"tailscale.com/types/views"
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"tailscale.com/wgengine"
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"tailscale.com/wgengine/netstack"
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"tailscale.com/words"
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)
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// ControlURL defines the URL to be used for connection to Control.
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var ControlURL = ipn.DefaultControlURL
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func main() {
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js.Global().Set("newIPN", js.FuncOf(func(this js.Value, args []js.Value) any {
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if len(args) != 1 {
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log.Fatal("Usage: newIPN(config)")
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return nil
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}
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return newIPN(args[0])
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}))
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// Keep Go runtime alive, otherwise it will be shut down before newIPN gets
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// called.
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<-make(chan bool)
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}
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func newIPN(jsConfig js.Value) map[string]any {
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netns.SetEnabled(false)
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var store ipn.StateStore
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if jsStateStorage := jsConfig.Get("stateStorage"); !jsStateStorage.IsUndefined() {
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store = &jsStateStore{jsStateStorage}
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} else {
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store = new(mem.Store)
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}
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controlURL := ControlURL
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if jsControlURL := jsConfig.Get("controlURL"); jsControlURL.Type() == js.TypeString {
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controlURL = jsControlURL.String()
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}
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var authKey string
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if jsAuthKey := jsConfig.Get("authKey"); jsAuthKey.Type() == js.TypeString {
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authKey = jsAuthKey.String()
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}
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var hostname string
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if jsHostname := jsConfig.Get("hostname"); jsHostname.Type() == js.TypeString {
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hostname = jsHostname.String()
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} else {
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hostname = generateHostname()
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}
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lpc := getOrCreateLogPolicyConfig(store)
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c := logtail.Config{
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Collection: lpc.Collection,
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PrivateID: lpc.PrivateID,
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// Compressed requests set HTTP headers that are not supported by the
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// no-cors fetching mode:
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CompressLogs: false,
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HTTPC: &http.Client{Transport: &noCORSTransport{http.DefaultTransport}},
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}
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logtail := logtail.NewLogger(c, log.Printf)
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logf := logtail.Logf
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sys := tsd.NewSystem()
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sys.Set(store)
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dialer := &tsdial.Dialer{Logf: logf}
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dialer.SetBus(sys.Bus.Get())
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eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
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Dialer: dialer,
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SetSubsystem: sys.Set,
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ControlKnobs: sys.ControlKnobs(),
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HealthTracker: sys.HealthTracker.Get(),
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Metrics: sys.UserMetricsRegistry(),
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EventBus: sys.Bus.Get(),
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})
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if err != nil {
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log.Fatal(err)
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}
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sys.Set(eng)
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ns, err := netstack.Create(logf, sys.Tun.Get(), eng, sys.MagicSock.Get(), dialer, sys.DNSManager.Get(), sys.ProxyMapper())
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if err != nil {
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log.Fatalf("netstack.Create: %v", err)
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}
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sys.Set(ns)
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ns.ProcessLocalIPs = true
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ns.ProcessSubnets = true
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dialer.UseNetstackForIP = func(ip netip.Addr) bool {
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return true
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}
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dialer.NetstackDialTCP = func(ctx context.Context, dst netip.AddrPort) (net.Conn, error) {
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return ns.DialContextTCP(ctx, dst)
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}
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dialer.NetstackDialUDP = func(ctx context.Context, dst netip.AddrPort) (net.Conn, error) {
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return ns.DialContextUDP(ctx, dst)
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}
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sys.NetstackRouter.Set(true)
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sys.Tun.Get().Start()
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logid := lpc.PublicID
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srv := ipnserver.New(logf, logid, sys.Bus.Get(), sys.NetMon.Get())
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lb, err := ipnlocal.NewLocalBackend(logf, logid, sys, controlclient.LoginEphemeral)
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if err != nil {
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log.Fatalf("ipnlocal.NewLocalBackend: %v", err)
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}
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if err := ns.Start(lb); err != nil {
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log.Fatalf("failed to start netstack: %v", err)
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}
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srv.SetLocalBackend(lb)
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jsIPN := &jsIPN{
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dialer: dialer,
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srv: srv,
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lb: lb,
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controlURL: controlURL,
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authKey: authKey,
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hostname: hostname,
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}
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return map[string]any{
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"run": js.FuncOf(func(this js.Value, args []js.Value) any {
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if len(args) != 1 {
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log.Fatal(`Usage: run({
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notifyState(state: int): void,
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notifyNetMap(netMap: object): void,
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notifyBrowseToURL(url: string): void,
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notifyPanicRecover(err: string): void,
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})`)
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return nil
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}
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jsIPN.run(args[0])
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return nil
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}),
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"login": js.FuncOf(func(this js.Value, args []js.Value) any {
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if len(args) != 0 {
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log.Printf("Usage: login()")
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return nil
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}
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jsIPN.login()
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return nil
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}),
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"logout": js.FuncOf(func(this js.Value, args []js.Value) any {
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if len(args) != 0 {
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log.Printf("Usage: logout()")
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return nil
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}
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jsIPN.logout()
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return nil
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}),
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"ssh": js.FuncOf(func(this js.Value, args []js.Value) any {
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if len(args) != 3 {
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log.Printf("Usage: ssh(hostname, userName, termConfig)")
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return nil
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}
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return jsIPN.ssh(
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args[0].String(),
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args[1].String(),
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args[2])
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}),
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"fetch": js.FuncOf(func(this js.Value, args []js.Value) any {
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if len(args) != 1 {
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log.Printf("Usage: fetch(url)")
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return nil
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}
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url := args[0].String()
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return jsIPN.fetch(url)
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}),
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}
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}
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type jsIPN struct {
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dialer *tsdial.Dialer
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srv *ipnserver.Server
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lb *ipnlocal.LocalBackend
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controlURL string
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authKey string
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hostname string
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}
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var jsIPNState = map[ipn.State]string{
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ipn.NoState: "NoState",
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ipn.InUseOtherUser: "InUseOtherUser",
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ipn.NeedsLogin: "NeedsLogin",
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ipn.NeedsMachineAuth: "NeedsMachineAuth",
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ipn.Stopped: "Stopped",
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ipn.Starting: "Starting",
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ipn.Running: "Running",
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}
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var jsMachineStatus = map[tailcfg.MachineStatus]string{
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tailcfg.MachineUnknown: "MachineUnknown",
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tailcfg.MachineUnauthorized: "MachineUnauthorized",
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tailcfg.MachineAuthorized: "MachineAuthorized",
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tailcfg.MachineInvalid: "MachineInvalid",
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}
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func (i *jsIPN) run(jsCallbacks js.Value) {
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notifyState := func(state ipn.State) {
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jsCallbacks.Call("notifyState", jsIPNState[state])
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}
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notifyState(ipn.NoState)
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i.lb.SetNotifyCallback(func(n ipn.Notify) {
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// Panics in the notify callback are likely due to be due to bugs in
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// this bridging module (as opposed to actual bugs in Tailscale) and
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// thus may be recoverable. Let the UI know, and allow the user to
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// choose if they want to reload the page.
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defer func() {
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if r := recover(); r != nil {
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fmt.Println("Panic recovered:", r)
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jsCallbacks.Call("notifyPanicRecover", fmt.Sprint(r))
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}
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}()
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log.Printf("NOTIFY: %+v", n)
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if n.State != nil {
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notifyState(*n.State)
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}
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if nm := n.NetMap; nm != nil {
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jsNetMap := jsNetMap{
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Self: jsNetMapSelfNode{
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jsNetMapNode: jsNetMapNode{
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Name: nm.Name,
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Addresses: mapSliceView(nm.GetAddresses(), func(a netip.Prefix) string { return a.Addr().String() }),
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NodeKey: nm.NodeKey.String(),
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MachineKey: nm.MachineKey.String(),
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},
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MachineStatus: jsMachineStatus[nm.GetMachineStatus()],
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},
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Peers: mapSlice(nm.Peers, func(p tailcfg.NodeView) jsNetMapPeerNode {
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name := p.Name()
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if name == "" {
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// In practice this should only happen for Hello.
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name = p.Hostinfo().Hostname()
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}
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addrs := make([]string, p.Addresses().Len())
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for i, ap := range p.Addresses().All() {
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addrs[i] = ap.Addr().String()
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}
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return jsNetMapPeerNode{
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jsNetMapNode: jsNetMapNode{
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Name: name,
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Addresses: addrs,
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MachineKey: p.Machine().String(),
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NodeKey: p.Key().String(),
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},
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Online: p.Online().Clone(),
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TailscaleSSHEnabled: p.Hostinfo().TailscaleSSHEnabled(),
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}
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}),
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LockedOut: nm.TKAEnabled && nm.SelfNode.KeySignature().Len() == 0,
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}
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if jsonNetMap, err := json.Marshal(jsNetMap); err == nil {
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jsCallbacks.Call("notifyNetMap", string(jsonNetMap))
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} else {
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log.Printf("Could not generate JSON netmap: %v", err)
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}
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}
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if n.BrowseToURL != nil {
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jsCallbacks.Call("notifyBrowseToURL", *n.BrowseToURL)
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}
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})
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go func() {
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err := i.lb.Start(ipn.Options{
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UpdatePrefs: &ipn.Prefs{
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ControlURL: i.controlURL,
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RouteAll: false,
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WantRunning: true,
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Hostname: i.hostname,
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},
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AuthKey: i.authKey,
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})
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if err != nil {
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log.Printf("Start error: %v", err)
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}
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}()
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go func() {
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ln, err := safesocket.Listen("")
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if err != nil {
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log.Fatalf("safesocket.Listen: %v", err)
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}
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err = i.srv.Run(context.Background(), ln)
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log.Fatalf("ipnserver.Run exited: %v", err)
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}()
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}
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func (i *jsIPN) login() {
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go i.lb.StartLoginInteractive(context.Background())
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}
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func (i *jsIPN) logout() {
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if i.lb.State() == ipn.NoState {
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log.Printf("Backend not running")
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}
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go func() {
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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i.lb.Logout(ctx, ipnauth.Self)
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}()
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}
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func (i *jsIPN) ssh(host, username string, termConfig js.Value) map[string]any {
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jsSSHSession := &jsSSHSession{
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jsIPN: i,
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host: host,
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username: username,
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termConfig: termConfig,
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}
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go jsSSHSession.Run()
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return map[string]any{
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"close": js.FuncOf(func(this js.Value, args []js.Value) any {
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return jsSSHSession.Close() != nil
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}),
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"resize": js.FuncOf(func(this js.Value, args []js.Value) any {
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rows := args[0].Int()
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cols := args[1].Int()
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return jsSSHSession.Resize(rows, cols) != nil
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}),
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}
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}
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type jsSSHSession struct {
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jsIPN *jsIPN
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host string
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username string
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termConfig js.Value
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session *ssh.Session
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pendingResizeRows int
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pendingResizeCols int
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}
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func (s *jsSSHSession) Run() {
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writeFn := s.termConfig.Get("writeFn")
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writeErrorFn := s.termConfig.Get("writeErrorFn")
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setReadFn := s.termConfig.Get("setReadFn")
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rows := s.termConfig.Get("rows").Int()
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cols := s.termConfig.Get("cols").Int()
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timeoutSeconds := 5.0
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if jsTimeoutSeconds := s.termConfig.Get("timeoutSeconds"); jsTimeoutSeconds.Type() == js.TypeNumber {
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timeoutSeconds = jsTimeoutSeconds.Float()
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}
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onConnectionProgress := s.termConfig.Get("onConnectionProgress")
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onConnected := s.termConfig.Get("onConnected")
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onDone := s.termConfig.Get("onDone")
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defer onDone.Invoke()
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writeError := func(label string, err error) {
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writeErrorFn.Invoke(fmt.Sprintf("%s Error: %v\r\n", label, err))
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}
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reportProgress := func(message string) {
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onConnectionProgress.Invoke(message)
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}
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ctx, cancel := context.WithTimeout(context.Background(), time.Duration(timeoutSeconds*float64(time.Second)))
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defer cancel()
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reportProgress(fmt.Sprintf("Connecting to %s…", strings.Split(s.host, ".")[0]))
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c, err := s.jsIPN.dialer.UserDial(ctx, "tcp", net.JoinHostPort(s.host, "22"))
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if err != nil {
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writeError("Dial", err)
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return
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}
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defer c.Close()
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config := &ssh.ClientConfig{
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HostKeyCallback: func(hostname string, remote net.Addr, key ssh.PublicKey) error {
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// Host keys are not used with Tailscale SSH, but we can use this
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// callback to know that the connection has been established.
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reportProgress("SSH connection established…")
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return nil
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},
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User: s.username,
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}
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reportProgress("Starting SSH client…")
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sshConn, _, _, err := ssh.NewClientConn(c, s.host, config)
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if err != nil {
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writeError("SSH Connection", err)
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return
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}
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defer sshConn.Close()
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sshClient := ssh.NewClient(sshConn, nil, nil)
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defer sshClient.Close()
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session, err := sshClient.NewSession()
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if err != nil {
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writeError("SSH Session", err)
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return
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}
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s.session = session
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defer session.Close()
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stdin, err := session.StdinPipe()
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if err != nil {
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writeError("SSH Stdin", err)
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return
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}
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session.Stdout = termWriter{writeFn}
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session.Stderr = termWriter{writeFn}
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setReadFn.Invoke(js.FuncOf(func(this js.Value, args []js.Value) any {
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input := args[0].String()
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_, err := stdin.Write([]byte(input))
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if err != nil {
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writeError("Write Input", err)
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}
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return nil
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}))
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// We might have gotten a resize notification since we started opening the
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// session, pick up the latest size.
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if s.pendingResizeRows != 0 {
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rows = s.pendingResizeRows
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}
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if s.pendingResizeCols != 0 {
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cols = s.pendingResizeCols
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}
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err = session.RequestPty("xterm", rows, cols, ssh.TerminalModes{})
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if err != nil {
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writeError("Pseudo Terminal", err)
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return
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}
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err = session.Shell()
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if err != nil {
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writeError("Shell", err)
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return
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}
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onConnected.Invoke()
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err = session.Wait()
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if err != nil {
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writeError("Wait", err)
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return
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}
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}
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func (s *jsSSHSession) Close() error {
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if s.session == nil {
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// We never had a chance to open the session, ignore the close request.
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return nil
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}
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return s.session.Close()
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}
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func (s *jsSSHSession) Resize(rows, cols int) error {
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if s.session == nil {
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s.pendingResizeRows = rows
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s.pendingResizeCols = cols
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return nil
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}
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return s.session.WindowChange(rows, cols)
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}
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func (i *jsIPN) fetch(url string) js.Value {
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return makePromise(func() (any, error) {
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c := &http.Client{
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Transport: &http.Transport{
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DialContext: i.dialer.UserDial,
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},
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}
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res, err := c.Get(url)
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if err != nil {
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return nil, err
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}
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return map[string]any{
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"status": res.StatusCode,
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"statusText": res.Status,
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"text": js.FuncOf(func(this js.Value, args []js.Value) any {
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return makePromise(func() (any, error) {
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defer res.Body.Close()
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buf := new(bytes.Buffer)
|
|
if _, err := buf.ReadFrom(res.Body); err != nil {
|
|
return nil, err
|
|
}
|
|
return buf.String(), nil
|
|
})
|
|
}),
|
|
// TODO: populate a more complete JS Response object
|
|
}, nil
|
|
})
|
|
}
|
|
|
|
type termWriter struct {
|
|
f js.Value
|
|
}
|
|
|
|
func (w termWriter) Write(p []byte) (n int, err error) {
|
|
r := bytes.Replace(p, []byte("\n"), []byte("\n\r"), -1)
|
|
w.f.Invoke(string(r))
|
|
return len(p), nil
|
|
}
|
|
|
|
type jsNetMap struct {
|
|
Self jsNetMapSelfNode `json:"self"`
|
|
Peers []jsNetMapPeerNode `json:"peers"`
|
|
LockedOut bool `json:"lockedOut"`
|
|
}
|
|
|
|
type jsNetMapNode struct {
|
|
Name string `json:"name"`
|
|
Addresses []string `json:"addresses"`
|
|
MachineKey string `json:"machineKey"`
|
|
NodeKey string `json:"nodeKey"`
|
|
}
|
|
|
|
type jsNetMapSelfNode struct {
|
|
jsNetMapNode
|
|
MachineStatus string `json:"machineStatus"`
|
|
}
|
|
|
|
type jsNetMapPeerNode struct {
|
|
jsNetMapNode
|
|
Online *bool `json:"online,omitempty"`
|
|
TailscaleSSHEnabled bool `json:"tailscaleSSHEnabled"`
|
|
}
|
|
|
|
type jsStateStore struct {
|
|
jsStateStorage js.Value
|
|
}
|
|
|
|
func (s *jsStateStore) ReadState(id ipn.StateKey) ([]byte, error) {
|
|
jsValue := s.jsStateStorage.Call("getState", string(id))
|
|
if jsValue.String() == "" {
|
|
return nil, ipn.ErrStateNotExist
|
|
}
|
|
return hex.DecodeString(jsValue.String())
|
|
}
|
|
|
|
func (s *jsStateStore) WriteState(id ipn.StateKey, bs []byte) error {
|
|
s.jsStateStorage.Call("setState", string(id), hex.EncodeToString(bs))
|
|
return nil
|
|
}
|
|
|
|
func mapSlice[T any, M any](a []T, f func(T) M) []M {
|
|
n := make([]M, len(a))
|
|
for i, e := range a {
|
|
n[i] = f(e)
|
|
}
|
|
return n
|
|
}
|
|
|
|
func mapSliceView[T any, M any](a views.Slice[T], f func(T) M) []M {
|
|
n := make([]M, a.Len())
|
|
for i, v := range a.All() {
|
|
n[i] = f(v)
|
|
}
|
|
return n
|
|
}
|
|
|
|
func filterSlice[T any](a []T, f func(T) bool) []T {
|
|
n := make([]T, 0, len(a))
|
|
for _, e := range a {
|
|
if f(e) {
|
|
n = append(n, e)
|
|
}
|
|
}
|
|
return n
|
|
}
|
|
|
|
func generateHostname() string {
|
|
tails := words.Tails()
|
|
scales := words.Scales()
|
|
if rand.IntN(2) == 0 {
|
|
// JavaScript
|
|
tails = filterSlice(tails, func(s string) bool { return strings.HasPrefix(s, "j") })
|
|
scales = filterSlice(scales, func(s string) bool { return strings.HasPrefix(s, "s") })
|
|
} else {
|
|
// WebAssembly
|
|
tails = filterSlice(tails, func(s string) bool { return strings.HasPrefix(s, "w") })
|
|
scales = filterSlice(scales, func(s string) bool { return strings.HasPrefix(s, "a") })
|
|
}
|
|
|
|
tail := tails[rand.IntN(len(tails))]
|
|
scale := scales[rand.IntN(len(scales))]
|
|
return fmt.Sprintf("%s-%s", tail, scale)
|
|
}
|
|
|
|
// makePromise handles the boilerplate of wrapping goroutines with JS promises.
|
|
// f is run on a goroutine and its return value is used to resolve the promise
|
|
// (or reject it if an error is returned).
|
|
func makePromise(f func() (any, error)) js.Value {
|
|
handler := js.FuncOf(func(this js.Value, args []js.Value) any {
|
|
resolve := args[0]
|
|
reject := args[1]
|
|
go func() {
|
|
if res, err := f(); err == nil {
|
|
resolve.Invoke(res)
|
|
} else {
|
|
reject.Invoke(err.Error())
|
|
}
|
|
}()
|
|
return nil
|
|
})
|
|
|
|
promiseConstructor := js.Global().Get("Promise")
|
|
return promiseConstructor.New(handler)
|
|
}
|
|
|
|
const logPolicyStateKey = "log-policy"
|
|
|
|
func getOrCreateLogPolicyConfig(state ipn.StateStore) *logpolicy.Config {
|
|
if configBytes, err := state.ReadState(logPolicyStateKey); err == nil {
|
|
if config, err := logpolicy.ConfigFromBytes(configBytes); err == nil {
|
|
return config
|
|
} else {
|
|
log.Printf("Could not parse log policy config: %v", err)
|
|
}
|
|
} else if err != ipn.ErrStateNotExist {
|
|
log.Printf("Could not get log policy config from state store: %v", err)
|
|
}
|
|
config := logpolicy.NewConfig(logtail.CollectionNode)
|
|
if err := state.WriteState(logPolicyStateKey, config.ToBytes()); err != nil {
|
|
log.Printf("Could not save log policy config to state store: %v", err)
|
|
}
|
|
return config
|
|
}
|
|
|
|
// noCORSTransport wraps a RoundTripper and forces the no-cors mode on requests,
|
|
// so that we can use it with non-CORS-aware servers.
|
|
type noCORSTransport struct {
|
|
http.RoundTripper
|
|
}
|
|
|
|
func (t *noCORSTransport) RoundTrip(req *http.Request) (*http.Response, error) {
|
|
req.Header.Set("js.fetch:mode", "no-cors")
|
|
resp, err := t.RoundTripper.RoundTrip(req)
|
|
if err == nil {
|
|
// In no-cors mode no response properties are returned. Populate just
|
|
// the status so that callers do not think this was an error.
|
|
resp.StatusCode = http.StatusOK
|
|
resp.Status = http.StatusText(http.StatusOK)
|
|
}
|
|
return resp, err
|
|
}
|