mirror of
https://github.com/tailscale/tailscale.git
synced 2024-12-11 10:44:41 +00:00
49896cbdfa
Fixes #8807 Signed-off-by: Sonia Appasamy <sonia@tailscale.com>
691 lines
19 KiB
Go
691 lines
19 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package ipnlocal
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import (
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"context"
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"crypto/tls"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net"
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"net/http"
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"net/http/httputil"
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"net/netip"
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"net/url"
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"os"
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"path"
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"strconv"
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"strings"
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"sync"
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"time"
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"golang.org/x/exp/slices"
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"tailscale.com/ipn"
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"tailscale.com/logtail/backoff"
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"tailscale.com/net/netutil"
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"tailscale.com/syncs"
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"tailscale.com/tailcfg"
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"tailscale.com/types/logger"
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"tailscale.com/util/mak"
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"tailscale.com/version"
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)
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// serveHTTPContextKey is the context.Value key for a *serveHTTPContext.
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type serveHTTPContextKey struct{}
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type serveHTTPContext struct {
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SrcAddr netip.AddrPort
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DestPort uint16
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}
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// serveListener is the state of host-level net.Listen for a specific (Tailscale IP, serve port)
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// combination. If there are two TailscaleIPs (v4 and v6) and three ports being served,
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// then there will be six of these active and looping in their Run method.
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//
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// This is not used in userspace-networking mode.
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//
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// Most serve traffic is intercepted by netstack. This exists purely for connections
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// from the machine itself, as that goes via the kernel, so we need to be in the
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// kernel's listening/routing tables.
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type serveListener struct {
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b *LocalBackend
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ap netip.AddrPort
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ctx context.Context // valid while listener is desired
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cancel context.CancelFunc // for ctx, to close listener
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logf logger.Logf
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bo *backoff.Backoff // for retrying failed Listen calls
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closeListener syncs.AtomicValue[func() error] // Listener's Close method, if any
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}
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func (b *LocalBackend) newServeListener(ctx context.Context, ap netip.AddrPort, logf logger.Logf) *serveListener {
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ctx, cancel := context.WithCancel(ctx)
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return &serveListener{
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b: b,
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ap: ap,
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ctx: ctx,
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cancel: cancel,
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logf: logf,
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bo: backoff.NewBackoff("serve-listener", logf, 30*time.Second),
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}
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}
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// Close cancels the context and closes the listener, if any.
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func (s *serveListener) Close() error {
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s.cancel()
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if close, ok := s.closeListener.LoadOk(); ok {
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s.closeListener.Store(nil)
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close()
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}
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return nil
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}
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// Run starts a net.Listen for the serveListener's address and port.
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// If unable to listen, it retries with exponential backoff.
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// Listen is retried until the context is canceled.
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func (s *serveListener) Run() {
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for {
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ip := s.ap.Addr()
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ipStr := ip.String()
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var lc net.ListenConfig
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if initListenConfig != nil {
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// On macOS, this sets the lc.Control hook to
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// setsockopt the interface index to bind to. This is
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// required by the network sandbox to allow binding to
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// a specific interface. Without this hook, the system
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// chooses a default interface to bind to.
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if err := initListenConfig(&lc, ip, s.b.prevIfState, s.b.dialer.TUNName()); err != nil {
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s.logf("serve failed to init listen config %v, backing off: %v", s.ap, err)
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s.bo.BackOff(s.ctx, err)
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continue
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}
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// On macOS (AppStore or macsys) and if we're binding to a privileged port,
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if version.IsSandboxedMacOS() && s.ap.Port() < 1024 {
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// On macOS, we need to bind to ""/all-interfaces due to
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// the network sandbox. Ideally we would only bind to the
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// Tailscale interface, but macOS errors out if we try to
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// to listen on privileged ports binding only to a specific
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// interface. (#6364)
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ipStr = ""
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}
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}
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tcp4or6 := "tcp4"
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if ip.Is6() {
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tcp4or6 = "tcp6"
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}
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ln, err := lc.Listen(s.ctx, tcp4or6, net.JoinHostPort(ipStr, fmt.Sprint(s.ap.Port())))
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if err != nil {
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if s.shouldWarnAboutListenError(err) {
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s.logf("serve failed to listen on %v, backing off: %v", s.ap, err)
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}
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s.bo.BackOff(s.ctx, err)
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continue
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}
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s.closeListener.Store(ln.Close)
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s.logf("serve listening on %v", s.ap)
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err = s.handleServeListenersAccept(ln)
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if s.ctx.Err() != nil {
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// context canceled, we're done
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return
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}
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if err != nil {
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s.logf("serve listener accept error, retrying: %v", err)
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}
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}
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}
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func (s *serveListener) shouldWarnAboutListenError(err error) bool {
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if !s.b.sys.NetMon.Get().InterfaceState().HasIP(s.ap.Addr()) {
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// Machine likely doesn't have IPv6 enabled (or the IP is still being
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// assigned). No need to warn. Notably, WSL2 (Issue 6303).
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return false
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}
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// TODO(bradfitz): check errors.Is(err, syscall.EADDRNOTAVAIL) etc? Let's
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// see what happens in practice.
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return true
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}
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// handleServeListenersAccept accepts connections for the Listener.
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// Calls incoming handler in a new goroutine for each accepted connection.
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func (s *serveListener) handleServeListenersAccept(ln net.Listener) error {
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for {
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conn, err := ln.Accept()
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if err != nil {
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return err
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}
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srcAddr := conn.RemoteAddr().(*net.TCPAddr).AddrPort()
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handler := s.b.tcpHandlerForServe(s.ap.Port(), srcAddr)
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if handler == nil {
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s.b.logf("serve RST for %v", srcAddr)
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conn.Close()
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continue
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}
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go handler(conn)
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}
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}
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// updateServeTCPPortNetMapAddrListenersLocked starts a net.Listen for configured
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// Serve ports on all the node's addresses.
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// Existing Listeners are closed if port no longer in incoming ports list.
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//
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// b.mu must be held.
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func (b *LocalBackend) updateServeTCPPortNetMapAddrListenersLocked(ports []uint16) {
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// close existing listeners where port
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// is no longer in incoming ports list
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for ap, sl := range b.serveListeners {
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if !slices.Contains(ports, ap.Port()) {
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b.logf("closing listener %v", ap)
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sl.Close()
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delete(b.serveListeners, ap)
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}
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}
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nm := b.netMap
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if nm == nil {
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b.logf("netMap is nil")
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return
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}
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if nm.SelfNode == nil {
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b.logf("netMap SelfNode is nil")
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return
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}
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for _, a := range nm.Addresses {
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for _, p := range ports {
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addrPort := netip.AddrPortFrom(a.Addr(), p)
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if _, ok := b.serveListeners[addrPort]; ok {
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continue // already listening
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}
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sl := b.newServeListener(context.Background(), addrPort, b.logf)
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mak.Set(&b.serveListeners, addrPort, sl)
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go sl.Run()
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}
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}
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}
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// SetServeConfig establishes or replaces the current serve config.
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func (b *LocalBackend) SetServeConfig(config *ipn.ServeConfig) error {
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b.mu.Lock()
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defer b.mu.Unlock()
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prefs := b.pm.CurrentPrefs()
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if config.IsFunnelOn() && prefs.ShieldsUp() {
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return errors.New("Unable to turn on Funnel while shields-up is enabled")
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}
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nm := b.netMap
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if nm == nil {
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return errors.New("netMap is nil")
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}
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if nm.SelfNode == nil {
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return errors.New("netMap SelfNode is nil")
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}
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profileID := b.pm.CurrentProfile().ID
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confKey := ipn.ServeConfigKey(profileID)
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var bs []byte
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if config != nil {
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j, err := json.Marshal(config)
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if err != nil {
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return fmt.Errorf("encoding serve config: %w", err)
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}
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bs = j
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}
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if err := b.store.WriteState(confKey, bs); err != nil {
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return fmt.Errorf("writing ServeConfig to StateStore: %w", err)
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}
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b.setTCPPortsInterceptedFromNetmapAndPrefsLocked(b.pm.CurrentPrefs())
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return nil
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}
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// ServeConfig provides a view of the current serve mappings.
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// If serving is not configured, the returned view is not Valid.
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func (b *LocalBackend) ServeConfig() ipn.ServeConfigView {
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b.mu.Lock()
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defer b.mu.Unlock()
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return b.serveConfig
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}
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func (b *LocalBackend) HandleIngressTCPConn(ingressPeer *tailcfg.Node, target ipn.HostPort, srcAddr netip.AddrPort, getConnOrReset func() (net.Conn, bool), sendRST func()) {
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b.mu.Lock()
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sc := b.serveConfig
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b.mu.Unlock()
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if !sc.Valid() {
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b.logf("localbackend: got ingress conn w/o serveConfig; rejecting")
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sendRST()
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return
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}
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if !sc.AllowFunnel().Get(target) {
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b.logf("localbackend: got ingress conn for unconfigured %q; rejecting", target)
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sendRST()
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return
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}
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_, port, err := net.SplitHostPort(string(target))
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if err != nil {
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b.logf("localbackend: got ingress conn for bad target %q; rejecting", target)
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sendRST()
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return
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}
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port16, err := strconv.ParseUint(port, 10, 16)
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if err != nil {
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b.logf("localbackend: got ingress conn for bad target %q; rejecting", target)
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sendRST()
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return
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}
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dport := uint16(port16)
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if b.getTCPHandlerForFunnelFlow != nil {
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handler := b.getTCPHandlerForFunnelFlow(srcAddr, dport)
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if handler != nil {
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c, ok := getConnOrReset()
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if !ok {
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b.logf("localbackend: getConn didn't complete from %v to port %v", srcAddr, dport)
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return
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}
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handler(c)
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return
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}
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}
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// TODO(bradfitz): pass ingressPeer etc in context to tcpHandlerForServe,
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// extend serveHTTPContext or similar.
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handler := b.tcpHandlerForServe(dport, srcAddr)
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if handler == nil {
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sendRST()
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return
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}
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c, ok := getConnOrReset()
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if !ok {
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b.logf("localbackend: getConn didn't complete from %v to port %v", srcAddr, dport)
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return
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}
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handler(c)
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}
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// tcpHandlerForServe returns a handler for a TCP connection to be served via
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// the ipn.ServeConfig.
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func (b *LocalBackend) tcpHandlerForServe(dport uint16, srcAddr netip.AddrPort) (handler func(net.Conn) error) {
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b.mu.Lock()
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sc := b.serveConfig
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b.mu.Unlock()
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if !sc.Valid() {
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b.logf("[unexpected] localbackend: got TCP conn w/o serveConfig; from %v to port %v", srcAddr, dport)
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return nil
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}
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tcph, ok := sc.TCP().GetOk(dport)
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if !ok {
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b.logf("[unexpected] localbackend: got TCP conn without TCP config for port %v; from %v", dport, srcAddr)
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return nil
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}
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if tcph.HTTPS() || tcph.HTTP() {
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hs := &http.Server{
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Handler: http.HandlerFunc(b.serveWebHandler),
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BaseContext: func(_ net.Listener) context.Context {
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return context.WithValue(context.Background(), serveHTTPContextKey{}, &serveHTTPContext{
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SrcAddr: srcAddr,
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DestPort: dport,
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})
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},
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}
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if tcph.HTTPS() {
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hs.TLSConfig = &tls.Config{
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GetCertificate: b.getTLSServeCertForPort(dport),
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}
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return func(c net.Conn) error {
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return hs.ServeTLS(netutil.NewOneConnListener(c, nil), "", "")
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}
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}
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return func(c net.Conn) error {
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return hs.Serve(netutil.NewOneConnListener(c, nil))
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}
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}
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if backDst := tcph.TCPForward(); backDst != "" {
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return func(conn net.Conn) error {
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defer conn.Close()
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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backConn, err := b.dialer.SystemDial(ctx, "tcp", backDst)
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cancel()
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if err != nil {
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b.logf("localbackend: failed to TCP proxy port %v (from %v) to %s: %v", dport, srcAddr, backDst, err)
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return nil
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}
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defer backConn.Close()
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if sni := tcph.TerminateTLS(); sni != "" {
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conn = tls.Server(conn, &tls.Config{
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GetCertificate: func(hi *tls.ClientHelloInfo) (*tls.Certificate, error) {
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ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
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defer cancel()
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pair, err := b.GetCertPEM(ctx, sni, false)
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if err != nil {
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return nil, err
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}
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cert, err := tls.X509KeyPair(pair.CertPEM, pair.KeyPEM)
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if err != nil {
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return nil, err
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}
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return &cert, nil
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},
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})
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}
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// TODO(bradfitz): do the RegisterIPPortIdentity and
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// UnregisterIPPortIdentity stuff that netstack does
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errc := make(chan error, 1)
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go func() {
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_, err := io.Copy(backConn, conn)
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errc <- err
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}()
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go func() {
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_, err := io.Copy(conn, backConn)
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errc <- err
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}()
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return <-errc
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}
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}
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b.logf("closing TCP conn to port %v (from %v) with actionless TCPPortHandler", dport, srcAddr)
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return nil
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}
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func getServeHTTPContext(r *http.Request) (c *serveHTTPContext, ok bool) {
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c, ok = r.Context().Value(serveHTTPContextKey{}).(*serveHTTPContext)
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return c, ok
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}
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func (b *LocalBackend) getServeHandler(r *http.Request) (_ ipn.HTTPHandlerView, at string, ok bool) {
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var z ipn.HTTPHandlerView // zero value
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hostname := r.Host
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if r.TLS == nil {
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tcd := "." + b.Status().CurrentTailnet.MagicDNSSuffix
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if host, _, err := net.SplitHostPort(hostname); err == nil {
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hostname = host
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}
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if !strings.HasSuffix(hostname, tcd) {
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hostname += tcd
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}
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} else {
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hostname = r.TLS.ServerName
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}
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sctx, ok := getServeHTTPContext(r)
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if !ok {
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b.logf("[unexpected] localbackend: no serveHTTPContext in request")
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return z, "", false
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}
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wsc, ok := b.webServerConfig(hostname, sctx.DestPort)
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if !ok {
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return z, "", false
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}
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if h, ok := wsc.Handlers().GetOk(r.URL.Path); ok {
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return h, r.URL.Path, true
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}
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pth := path.Clean(r.URL.Path)
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for {
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withSlash := pth + "/"
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if h, ok := wsc.Handlers().GetOk(withSlash); ok {
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return h, withSlash, true
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}
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if h, ok := wsc.Handlers().GetOk(pth); ok {
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return h, pth, true
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}
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if pth == "/" {
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return z, "", false
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}
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pth = path.Dir(pth)
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}
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}
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// proxyHandlerForBackend creates a new HTTP reverse proxy for a particular backend that
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// we serve requests for. `backend` is a HTTPHandler.Proxy string (url, hostport or just port).
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func (b *LocalBackend) proxyHandlerForBackend(backend string) (*httputil.ReverseProxy, error) {
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targetURL, insecure := expandProxyArg(backend)
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u, err := url.Parse(targetURL)
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if err != nil {
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return nil, fmt.Errorf("invalid url %s: %w", targetURL, err)
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}
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rp := &httputil.ReverseProxy{
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Rewrite: func(r *httputil.ProxyRequest) {
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r.SetURL(u)
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r.Out.Host = r.In.Host
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addProxyForwardedHeaders(r)
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b.addTailscaleIdentityHeaders(r)
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},
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Transport: &http.Transport{
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DialContext: b.dialer.SystemDial,
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TLSClientConfig: &tls.Config{
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InsecureSkipVerify: insecure,
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},
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// Values for the following parameters have been copied from http.DefaultTransport.
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ForceAttemptHTTP2: true,
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MaxIdleConns: 100,
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IdleConnTimeout: 90 * time.Second,
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TLSHandshakeTimeout: 10 * time.Second,
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ExpectContinueTimeout: 1 * time.Second,
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},
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}
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return rp, nil
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}
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func addProxyForwardedHeaders(r *httputil.ProxyRequest) {
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r.Out.Header.Set("X-Forwarded-Host", r.In.Host)
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if r.In.TLS != nil {
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r.Out.Header.Set("X-Forwarded-Proto", "https")
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}
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if c, ok := getServeHTTPContext(r.Out); ok {
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r.Out.Header.Set("X-Forwarded-For", c.SrcAddr.Addr().String())
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}
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}
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func (b *LocalBackend) addTailscaleIdentityHeaders(r *httputil.ProxyRequest) {
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// Clear any incoming values squatting in the headers.
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r.Out.Header.Del("Tailscale-User-Login")
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r.Out.Header.Del("Tailscale-User-Name")
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r.Out.Header.Del("Tailscale-User-Profile-Pic")
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r.Out.Header.Del("Tailscale-Headers-Info")
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c, ok := getServeHTTPContext(r.Out)
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|
if !ok {
|
|
return
|
|
}
|
|
node, user, ok := b.WhoIs(c.SrcAddr)
|
|
if !ok {
|
|
return // traffic from outside of Tailnet (funneled)
|
|
}
|
|
if node.IsTagged() {
|
|
// 2023-06-14: Not setting identity headers for tagged nodes.
|
|
// Only currently set for nodes with user identities.
|
|
return
|
|
}
|
|
r.Out.Header.Set("Tailscale-User-Login", user.LoginName)
|
|
r.Out.Header.Set("Tailscale-User-Name", user.DisplayName)
|
|
r.Out.Header.Set("Tailscale-User-Profile-Pic", user.ProfilePicURL)
|
|
r.Out.Header.Set("Tailscale-Headers-Info", "https://tailscale.com/s/serve-headers")
|
|
}
|
|
|
|
func (b *LocalBackend) serveWebHandler(w http.ResponseWriter, r *http.Request) {
|
|
h, mountPoint, ok := b.getServeHandler(r)
|
|
if !ok {
|
|
http.NotFound(w, r)
|
|
return
|
|
}
|
|
if s := h.Text(); s != "" {
|
|
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
|
|
io.WriteString(w, s)
|
|
return
|
|
}
|
|
if v := h.Path(); v != "" {
|
|
b.serveFileOrDirectory(w, r, v, mountPoint)
|
|
return
|
|
}
|
|
if v := h.Proxy(); v != "" {
|
|
p, ok := b.serveProxyHandlers.Load(v)
|
|
if !ok {
|
|
http.Error(w, "unknown proxy destination", http.StatusInternalServerError)
|
|
return
|
|
}
|
|
h := p.(http.Handler)
|
|
// Trim the mount point from the URL path before proxying. (#6571)
|
|
if r.URL.Path != "/" {
|
|
h = http.StripPrefix(strings.TrimSuffix(mountPoint, "/"), h)
|
|
}
|
|
h.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
|
|
http.Error(w, "empty handler", 500)
|
|
}
|
|
|
|
func (b *LocalBackend) serveFileOrDirectory(w http.ResponseWriter, r *http.Request, fileOrDir, mountPoint string) {
|
|
fi, err := os.Stat(fileOrDir)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
http.NotFound(w, r)
|
|
return
|
|
}
|
|
http.Error(w, err.Error(), 500)
|
|
return
|
|
}
|
|
if fi.Mode().IsRegular() {
|
|
if mountPoint != r.URL.Path {
|
|
http.NotFound(w, r)
|
|
return
|
|
}
|
|
f, err := os.Open(fileOrDir)
|
|
if err != nil {
|
|
http.Error(w, err.Error(), 500)
|
|
return
|
|
}
|
|
defer f.Close()
|
|
http.ServeContent(w, r, path.Base(mountPoint), fi.ModTime(), f)
|
|
return
|
|
}
|
|
if !fi.IsDir() {
|
|
http.Error(w, "not a file or directory", 500)
|
|
return
|
|
}
|
|
if len(r.URL.Path) < len(mountPoint) && r.URL.Path+"/" == mountPoint {
|
|
http.Redirect(w, r, mountPoint, http.StatusFound)
|
|
return
|
|
}
|
|
|
|
var fs http.Handler = http.FileServer(http.Dir(fileOrDir))
|
|
if mountPoint != "/" {
|
|
fs = http.StripPrefix(strings.TrimSuffix(mountPoint, "/"), fs)
|
|
}
|
|
fs.ServeHTTP(&fixLocationHeaderResponseWriter{
|
|
ResponseWriter: w,
|
|
mountPoint: mountPoint,
|
|
}, r)
|
|
}
|
|
|
|
// fixLocationHeaderResponseWriter is an http.ResponseWriter wrapper that, upon
|
|
// flushing HTTP headers, prefixes any Location header with the mount point.
|
|
type fixLocationHeaderResponseWriter struct {
|
|
http.ResponseWriter
|
|
mountPoint string
|
|
fixOnce sync.Once // guards call to fix
|
|
}
|
|
|
|
func (w *fixLocationHeaderResponseWriter) fix() {
|
|
h := w.ResponseWriter.Header()
|
|
if v := h.Get("Location"); v != "" {
|
|
h.Set("Location", w.mountPoint+v)
|
|
}
|
|
}
|
|
|
|
func (w *fixLocationHeaderResponseWriter) WriteHeader(code int) {
|
|
w.fixOnce.Do(w.fix)
|
|
w.ResponseWriter.WriteHeader(code)
|
|
}
|
|
|
|
func (w *fixLocationHeaderResponseWriter) Write(p []byte) (int, error) {
|
|
w.fixOnce.Do(w.fix)
|
|
return w.ResponseWriter.Write(p)
|
|
}
|
|
|
|
// expandProxyArg returns a URL from s, where s can be of form:
|
|
//
|
|
// * port number ("8080")
|
|
// * host:port ("localhost:8080")
|
|
// * full URL ("http://localhost:8080", in which case it's returned unchanged)
|
|
// * insecure TLS ("https+insecure://127.0.0.1:4430")
|
|
func expandProxyArg(s string) (targetURL string, insecureSkipVerify bool) {
|
|
if s == "" {
|
|
return "", false
|
|
}
|
|
if strings.HasPrefix(s, "http://") || strings.HasPrefix(s, "https://") {
|
|
return s, false
|
|
}
|
|
if rest, ok := strings.CutPrefix(s, "https+insecure://"); ok {
|
|
return "https://" + rest, true
|
|
}
|
|
if allNumeric(s) {
|
|
return "http://127.0.0.1:" + s, false
|
|
}
|
|
return "http://" + s, false
|
|
}
|
|
|
|
func allNumeric(s string) bool {
|
|
for i := 0; i < len(s); i++ {
|
|
if s[i] < '0' || s[i] > '9' {
|
|
return false
|
|
}
|
|
}
|
|
return s != ""
|
|
}
|
|
|
|
func (b *LocalBackend) webServerConfig(hostname string, port uint16) (c ipn.WebServerConfigView, ok bool) {
|
|
key := ipn.HostPort(fmt.Sprintf("%s:%v", hostname, port))
|
|
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
if !b.serveConfig.Valid() {
|
|
return c, false
|
|
}
|
|
return b.serveConfig.Web().GetOk(key)
|
|
}
|
|
|
|
func (b *LocalBackend) getTLSServeCertForPort(port uint16) func(hi *tls.ClientHelloInfo) (*tls.Certificate, error) {
|
|
return func(hi *tls.ClientHelloInfo) (*tls.Certificate, error) {
|
|
if hi == nil || hi.ServerName == "" {
|
|
return nil, errors.New("no SNI ServerName")
|
|
}
|
|
_, ok := b.webServerConfig(hi.ServerName, port)
|
|
if !ok {
|
|
return nil, errors.New("no webserver configured for name/port")
|
|
}
|
|
|
|
ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
|
|
defer cancel()
|
|
pair, err := b.GetCertPEM(ctx, hi.ServerName, false)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
cert, err := tls.X509KeyPair(pair.CertPEM, pair.KeyPEM)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &cert, nil
|
|
}
|
|
}
|