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2361 lines
64 KiB
Go
2361 lines
64 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ipnlocal
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import (
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"bytes"
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"context"
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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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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"sort"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"syscall"
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"time"
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"inet.af/netaddr"
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"tailscale.com/control/controlclient"
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"tailscale.com/health"
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"tailscale.com/internal/deepprint"
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"tailscale.com/ipn"
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"tailscale.com/ipn/ipnstate"
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"tailscale.com/ipn/policy"
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"tailscale.com/net/dns"
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"tailscale.com/net/interfaces"
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"tailscale.com/net/tsaddr"
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"tailscale.com/paths"
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"tailscale.com/portlist"
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"tailscale.com/tailcfg"
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"tailscale.com/types/empty"
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"tailscale.com/types/key"
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"tailscale.com/types/logger"
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"tailscale.com/types/netmap"
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"tailscale.com/types/persist"
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"tailscale.com/types/wgkey"
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"tailscale.com/util/dnsname"
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"tailscale.com/util/systemd"
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"tailscale.com/version"
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"tailscale.com/wgengine"
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"tailscale.com/wgengine/filter"
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"tailscale.com/wgengine/router"
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"tailscale.com/wgengine/wgcfg"
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"tailscale.com/wgengine/wgcfg/nmcfg"
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)
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var controlDebugFlags = getControlDebugFlags()
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func getControlDebugFlags() []string {
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if e := os.Getenv("TS_DEBUG_CONTROL_FLAGS"); e != "" {
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return strings.Split(e, ",")
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}
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return nil
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}
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// LocalBackend is the glue between the major pieces of the Tailscale
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// network software: the cloud control plane (via controlclient), the
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// network data plane (via wgengine), and the user-facing UIs and CLIs
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// (collectively called "frontends", via LocalBackend's implementation
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// of the Backend interface).
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//
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// LocalBackend implements the overall state machine for the Tailscale
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// application. Frontends, controlclient and wgengine can feed events
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// into LocalBackend to advance the state machine, and advancing the
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// state machine generates events back out to zero or more components.
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type LocalBackend struct {
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// Elements that are thread-safe or constant after construction.
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ctx context.Context // canceled by Close
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ctxCancel context.CancelFunc // cancels ctx
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logf logger.Logf // general logging
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keyLogf logger.Logf // for printing list of peers on change
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statsLogf logger.Logf // for printing peers stats on change
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e wgengine.Engine
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store ipn.StateStore
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backendLogID string
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unregisterLinkMon func()
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unregisterHealthWatch func()
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portpoll *portlist.Poller // may be nil
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portpollOnce sync.Once // guards starting readPoller
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gotPortPollRes chan struct{} // closed upon first readPoller result
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serverURL string // tailcontrol URL
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newDecompressor func() (controlclient.Decompressor, error)
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filterHash string
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// The mutex protects the following elements.
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mu sync.Mutex
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httpTestClient *http.Client // for controlclient. nil by default, used by tests.
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notify func(ipn.Notify)
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cc *controlclient.Client
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stateKey ipn.StateKey // computed in part from user-provided value
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userID string // current controlling user ID (for Windows, primarily)
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prefs *ipn.Prefs
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inServerMode bool
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machinePrivKey wgkey.Private
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state ipn.State
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// hostinfo is mutated in-place while mu is held.
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hostinfo *tailcfg.Hostinfo
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// netMap is not mutated in-place once set.
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netMap *netmap.NetworkMap
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nodeByAddr map[netaddr.IP]*tailcfg.Node
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activeLogin string // last logged LoginName from netMap
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engineStatus ipn.EngineStatus
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endpoints []string
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blocked bool
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authURL string
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interact bool
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prevIfState *interfaces.State
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peerAPIServer *peerAPIServer // or nil
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peerAPIListeners []*peerAPIListener
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incomingFiles map[*incomingFile]bool
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// directFileRoot, if non-empty, means to write received files
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// directly to this directory, without staging them in an
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// intermediate buffered directory for "pick-up" later. If
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// empty, the files are received in a daemon-owned location
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// and the localapi is used to enumerate, download, and delete
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// them. This is used on macOS where the GUI lifetime is the
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// same as the Network Extension lifetime and we can thus avoid
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// double-copying files by writing them to the right location
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// immediately.
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directFileRoot string
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// statusLock must be held before calling statusChanged.Wait() or
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// statusChanged.Broadcast().
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statusLock sync.Mutex
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statusChanged *sync.Cond
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}
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// NewLocalBackend returns a new LocalBackend that is ready to run,
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// but is not actually running.
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func NewLocalBackend(logf logger.Logf, logid string, store ipn.StateStore, e wgengine.Engine) (*LocalBackend, error) {
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if e == nil {
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panic("ipn.NewLocalBackend: wgengine must not be nil")
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}
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// Default filter blocks everything and logs nothing, until Start() is called.
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e.SetFilter(filter.NewAllowNone(logf, &netaddr.IPSet{}))
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ctx, cancel := context.WithCancel(context.Background())
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portpoll, err := portlist.NewPoller()
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if err != nil {
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logf("skipping portlist: %s", err)
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}
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b := &LocalBackend{
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ctx: ctx,
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ctxCancel: cancel,
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logf: logf,
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keyLogf: logger.LogOnChange(logf, 5*time.Minute, time.Now),
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statsLogf: logger.LogOnChange(logf, 5*time.Minute, time.Now),
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e: e,
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store: store,
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backendLogID: logid,
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state: ipn.NoState,
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portpoll: portpoll,
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gotPortPollRes: make(chan struct{}),
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}
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b.statusChanged = sync.NewCond(&b.statusLock)
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linkMon := e.GetLinkMonitor()
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b.prevIfState = linkMon.InterfaceState()
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// Call our linkChange code once with the current state, and
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// then also whenever it changes:
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b.linkChange(false, linkMon.InterfaceState())
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b.unregisterLinkMon = linkMon.RegisterChangeCallback(b.linkChange)
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b.unregisterHealthWatch = health.RegisterWatcher(b.onHealthChange)
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wiredPeerAPIPort := false
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if ig, ok := e.(wgengine.InternalsGetter); ok {
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if tunWrap, _, ok := ig.GetInternals(); ok {
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tunWrap.PeerAPIPort = b.getPeerAPIPortForTSMPPing
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wiredPeerAPIPort = true
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}
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}
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if !wiredPeerAPIPort {
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b.logf("[unexpected] failed to wire up peer API port for engine %T", e)
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}
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return b, nil
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}
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// SetDirectFileRoot sets the directory to download files to directly,
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// without buffering them through an intermediate daemon-owned
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// tailcfg.UserID-specific directory.
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//
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// This must be called before the LocalBackend starts being used.
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func (b *LocalBackend) SetDirectFileRoot(dir string) {
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b.mu.Lock()
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defer b.mu.Unlock()
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b.directFileRoot = dir
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}
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// linkChange is our link monitor callback, called whenever the network changes.
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// major is whether ifst is different than earlier.
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func (b *LocalBackend) linkChange(major bool, ifst *interfaces.State) {
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b.mu.Lock()
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defer b.mu.Unlock()
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hadPAC := b.prevIfState.HasPAC()
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b.prevIfState = ifst
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networkUp := ifst.AnyInterfaceUp()
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if b.cc != nil {
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go b.cc.SetPaused(b.state == ipn.Stopped || !networkUp)
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}
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// If the PAC-ness of the network changed, reconfig wireguard+route to
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// add/remove subnets.
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if hadPAC != ifst.HasPAC() {
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b.logf("linkChange: in state %v; PAC changed from %v->%v", b.state, hadPAC, ifst.HasPAC())
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switch b.state {
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case ipn.NoState, ipn.Stopped:
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// Do nothing.
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default:
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go b.authReconfig()
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}
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}
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// If the local network configuration has changed, our filter may
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// need updating to tweak default routes.
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b.updateFilter(b.netMap, b.prefs)
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if runtime.GOOS == "windows" && b.netMap != nil {
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want := len(b.netMap.Addresses)
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b.logf("linkChange: peerAPIListeners too low; trying again")
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if len(b.peerAPIListeners) < want {
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go b.initPeerAPIListener()
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}
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}
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}
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func (b *LocalBackend) onHealthChange(sys health.Subsystem, err error) {
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if err == nil {
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b.logf("health(%q): ok", sys)
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} else {
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b.logf("health(%q): error: %v", sys, err)
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}
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}
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// Shutdown halts the backend and all its sub-components. The backend
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// can no longer be used after Shutdown returns.
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func (b *LocalBackend) Shutdown() {
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b.mu.Lock()
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cc := b.cc
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b.mu.Unlock()
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b.unregisterLinkMon()
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b.unregisterHealthWatch()
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if cc != nil {
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cc.Shutdown()
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}
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b.ctxCancel()
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b.e.Close()
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b.e.Wait()
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}
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// Prefs returns a copy of b's current prefs, with any private keys removed.
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func (b *LocalBackend) Prefs() *ipn.Prefs {
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b.mu.Lock()
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defer b.mu.Unlock()
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p := b.prefs.Clone()
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if p != nil && p.Persist != nil {
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p.Persist.LegacyFrontendPrivateMachineKey = wgkey.Private{}
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p.Persist.PrivateNodeKey = wgkey.Private{}
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p.Persist.OldPrivateNodeKey = wgkey.Private{}
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}
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return p
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}
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// Status returns the latest status of the backend and its
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// sub-components.
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func (b *LocalBackend) Status() *ipnstate.Status {
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sb := new(ipnstate.StatusBuilder)
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b.UpdateStatus(sb)
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return sb.Status()
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}
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// StatusWithoutPeers is like Status but omits any details
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// of peers.
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func (b *LocalBackend) StatusWithoutPeers() *ipnstate.Status {
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sb := new(ipnstate.StatusBuilder)
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b.updateStatus(sb, nil)
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return sb.Status()
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}
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// UpdateStatus implements ipnstate.StatusUpdater.
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func (b *LocalBackend) UpdateStatus(sb *ipnstate.StatusBuilder) {
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b.e.UpdateStatus(sb)
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b.updateStatus(sb, b.populatePeerStatusLocked)
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}
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// updateStatus populates sb with status.
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//
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// extraLocked, if non-nil, is called while b.mu is still held.
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func (b *LocalBackend) updateStatus(sb *ipnstate.StatusBuilder, extraLocked func(*ipnstate.StatusBuilder)) {
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b.mu.Lock()
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defer b.mu.Unlock()
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sb.MutateStatus(func(s *ipnstate.Status) {
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s.Version = version.Long
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s.BackendState = b.state.String()
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s.AuthURL = b.authURL
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if b.netMap != nil {
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s.MagicDNSSuffix = b.netMap.MagicDNSSuffix()
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}
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})
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sb.MutateSelfStatus(func(ss *ipnstate.PeerStatus) {
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for _, pln := range b.peerAPIListeners {
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ss.PeerAPIURL = append(ss.PeerAPIURL, pln.urlStr)
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}
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})
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// TODO: hostinfo, and its networkinfo
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// TODO: EngineStatus copy (and deprecate it?)
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if extraLocked != nil {
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extraLocked(sb)
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}
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}
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func (b *LocalBackend) populatePeerStatusLocked(sb *ipnstate.StatusBuilder) {
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if b.netMap == nil {
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return
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}
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for id, up := range b.netMap.UserProfiles {
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sb.AddUser(id, up)
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}
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for _, p := range b.netMap.Peers {
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var lastSeen time.Time
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if p.LastSeen != nil {
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lastSeen = *p.LastSeen
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}
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var tailAddr string
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for _, addr := range p.Addresses {
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// The peer struct currently only allows a single
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// Tailscale IP address. For compatibility with the
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// old display, make sure it's the IPv4 address.
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if addr.IP.Is4() && addr.IsSingleIP() && tsaddr.IsTailscaleIP(addr.IP) {
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tailAddr = addr.IP.String()
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break
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}
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}
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sb.AddPeer(key.Public(p.Key), &ipnstate.PeerStatus{
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InNetworkMap: true,
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UserID: p.User,
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TailAddr: tailAddr,
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HostName: p.Hostinfo.Hostname,
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DNSName: p.Name,
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OS: p.Hostinfo.OS,
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KeepAlive: p.KeepAlive,
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Created: p.Created,
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LastSeen: lastSeen,
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ShareeNode: p.Hostinfo.ShareeNode,
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ExitNode: p.StableID != "" && p.StableID == b.prefs.ExitNodeID,
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})
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}
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}
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// WhoIs reports the node and user who owns the node with the given IP:port.
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// If the IP address is a Tailscale IP, the provided port may be 0.
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// If ok == true, n and u are valid.
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func (b *LocalBackend) WhoIs(ipp netaddr.IPPort) (n *tailcfg.Node, u tailcfg.UserProfile, ok bool) {
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b.mu.Lock()
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defer b.mu.Unlock()
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n, ok = b.nodeByAddr[ipp.IP]
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if !ok {
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var ip netaddr.IP
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if ipp.Port != 0 {
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ip, ok = b.e.WhoIsIPPort(ipp)
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}
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if !ok {
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return nil, u, false
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}
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n, ok = b.nodeByAddr[ip]
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if !ok {
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return nil, u, false
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}
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}
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u, ok = b.netMap.UserProfiles[n.User]
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if !ok {
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return nil, u, false
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}
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return n, u, true
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}
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// SetDecompressor sets a decompression function, which must be a zstd
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// reader.
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//
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// This exists because the iOS/Mac NetworkExtension is very resource
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// constrained, and the zstd package is too heavy to fit in the
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// constrained RSS limit.
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func (b *LocalBackend) SetDecompressor(fn func() (controlclient.Decompressor, error)) {
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b.newDecompressor = fn
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}
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// setClientStatus is the callback invoked by the control client whenever it posts a new status.
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// Among other things, this is where we update the netmap, packet filters, DNS and DERP maps.
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func (b *LocalBackend) setClientStatus(st controlclient.Status) {
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// The following do not depend on any data for which we need to lock b.
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if st.Err != "" {
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// TODO(crawshaw): display in the UI.
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if st.Err == "EOF" {
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b.logf("[v1] Received error: EOF")
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} else {
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b.logf("Received error: %v", st.Err)
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}
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return
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}
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if st.LoginFinished != nil {
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// Auth completed, unblock the engine
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b.blockEngineUpdates(false)
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b.authReconfig()
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b.send(ipn.Notify{LoginFinished: &empty.Message{}})
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}
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prefsChanged := false
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// Lock b once and do only the things that require locking.
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b.mu.Lock()
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prefs := b.prefs
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stateKey := b.stateKey
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netMap := b.netMap
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interact := b.interact
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if st.Persist != nil {
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if !b.prefs.Persist.Equals(st.Persist) {
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prefsChanged = true
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b.prefs.Persist = st.Persist.Clone()
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}
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}
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if st.NetMap != nil {
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if b.findExitNodeIDLocked(st.NetMap) {
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prefsChanged = true
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}
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b.setNetMapLocked(st.NetMap)
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}
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if st.URL != "" {
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b.authURL = st.URL
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}
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if b.state == ipn.NeedsLogin {
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if !b.prefs.WantRunning {
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prefsChanged = true
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}
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b.prefs.WantRunning = true
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}
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// Prefs will be written out; this is not safe unless locked or cloned.
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if prefsChanged {
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prefs = b.prefs.Clone()
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}
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b.mu.Unlock()
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// Now complete the lock-free parts of what we started while locked.
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if prefsChanged {
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if stateKey != "" {
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if err := b.store.WriteState(stateKey, prefs.ToBytes()); err != nil {
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b.logf("Failed to save new controlclient state: %v", err)
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}
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}
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b.send(ipn.Notify{Prefs: prefs})
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}
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if st.NetMap != nil {
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if netMap != nil {
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diff := st.NetMap.ConciseDiffFrom(netMap)
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if strings.TrimSpace(diff) == "" {
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b.logf("[v1] netmap diff: (none)")
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} else {
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b.logf("netmap diff:\n%v", diff)
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}
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}
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b.updateFilter(st.NetMap, prefs)
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b.e.SetNetworkMap(st.NetMap)
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b.e.SetDERPMap(st.NetMap.DERPMap)
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b.send(ipn.Notify{NetMap: st.NetMap})
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}
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if st.URL != "" {
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b.logf("Received auth URL: %.20v...", st.URL)
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if interact {
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b.popBrowserAuthNow()
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}
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}
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b.stateMachine()
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// This is currently (2020-07-28) necessary; conditionally disabling it is fragile!
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// This is where netmap information gets propagated to router and magicsock.
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b.authReconfig()
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}
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// findExitNodeIDLocked updates b.prefs to reference an exit node by ID,
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// rather than by IP. It returns whether prefs was mutated.
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func (b *LocalBackend) findExitNodeIDLocked(nm *netmap.NetworkMap) (prefsChanged bool) {
|
|
// If we have a desired IP on file, try to find the corresponding
|
|
// node.
|
|
if b.prefs.ExitNodeIP.IsZero() {
|
|
return false
|
|
}
|
|
|
|
// IP takes precedence over ID, so if both are set, clear ID.
|
|
if b.prefs.ExitNodeID != "" {
|
|
b.prefs.ExitNodeID = ""
|
|
prefsChanged = true
|
|
}
|
|
|
|
for _, peer := range nm.Peers {
|
|
for _, addr := range peer.Addresses {
|
|
if !addr.IsSingleIP() || addr.IP != b.prefs.ExitNodeIP {
|
|
continue
|
|
}
|
|
// Found the node being referenced, upgrade prefs to
|
|
// reference it directly for next time.
|
|
b.prefs.ExitNodeID = peer.StableID
|
|
b.prefs.ExitNodeIP = netaddr.IP{}
|
|
return true
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
// setWgengineStatus is the callback by the wireguard engine whenever it posts a new status.
|
|
// This updates the endpoints both in the backend and in the control client.
|
|
func (b *LocalBackend) setWgengineStatus(s *wgengine.Status, err error) {
|
|
if err != nil {
|
|
b.logf("wgengine status error: %v", err)
|
|
return
|
|
}
|
|
if s == nil {
|
|
b.logf("[unexpected] non-error wgengine update with status=nil: %v", s)
|
|
return
|
|
}
|
|
|
|
b.mu.Lock()
|
|
es := b.parseWgStatusLocked(s)
|
|
cc := b.cc
|
|
b.engineStatus = es
|
|
b.endpoints = append([]string{}, s.LocalAddrs...)
|
|
b.mu.Unlock()
|
|
|
|
if cc != nil {
|
|
cc.UpdateEndpoints(0, s.LocalAddrs)
|
|
}
|
|
b.stateMachine()
|
|
|
|
b.statusLock.Lock()
|
|
b.statusChanged.Broadcast()
|
|
b.statusLock.Unlock()
|
|
|
|
b.send(ipn.Notify{Engine: &es})
|
|
}
|
|
|
|
func (b *LocalBackend) SetNotifyCallback(notify func(ipn.Notify)) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
b.notify = notify
|
|
}
|
|
|
|
// SetHTTPTestClient sets an alternate HTTP client to use with
|
|
// connections to the coordination server. It exists for
|
|
// testing. Using nil means to use the default.
|
|
func (b *LocalBackend) SetHTTPTestClient(c *http.Client) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
b.httpTestClient = c
|
|
}
|
|
|
|
// Start applies the configuration specified in opts, and starts the
|
|
// state machine.
|
|
//
|
|
// TODO(danderson): this function is trying to do too many things at
|
|
// once: it loads state, or imports it, or updates prefs sometimes,
|
|
// contains some settings that are one-shot things done by `tailscale
|
|
// up` because we had nowhere else to put them, and there's no clear
|
|
// guarantee that switching from one user's state to another is
|
|
// actually a supported operation (it should be, but it's very unclear
|
|
// from the following whether or not that is a safe transition).
|
|
func (b *LocalBackend) Start(opts ipn.Options) error {
|
|
if opts.Prefs == nil && opts.StateKey == "" {
|
|
return errors.New("no state key or prefs provided")
|
|
}
|
|
|
|
if opts.Prefs != nil {
|
|
b.logf("Start: %v", opts.Prefs.Pretty())
|
|
} else {
|
|
b.logf("Start")
|
|
}
|
|
|
|
hostinfo := controlclient.NewHostinfo()
|
|
hostinfo.BackendLogID = b.backendLogID
|
|
hostinfo.FrontendLogID = opts.FrontendLogID
|
|
|
|
b.mu.Lock()
|
|
|
|
if b.cc != nil {
|
|
// TODO(apenwarr): avoid the need to reinit controlclient.
|
|
// This will trigger a full relogin/reconfigure cycle every
|
|
// time a Handle reconnects to the backend. Ideally, we
|
|
// would send the new Prefs and everything would get back
|
|
// into sync with the minimal changes. But that's not how it
|
|
// is right now, which is a sign that the code is still too
|
|
// complicated.
|
|
b.cc.Shutdown()
|
|
}
|
|
httpTestClient := b.httpTestClient
|
|
|
|
if b.hostinfo != nil {
|
|
hostinfo.Services = b.hostinfo.Services // keep any previous session and netinfo
|
|
hostinfo.NetInfo = b.hostinfo.NetInfo
|
|
}
|
|
b.hostinfo = hostinfo
|
|
b.state = ipn.NoState
|
|
|
|
if err := b.loadStateLocked(opts.StateKey, opts.Prefs); err != nil {
|
|
b.mu.Unlock()
|
|
return fmt.Errorf("loading requested state: %v", err)
|
|
}
|
|
|
|
wantRunning := b.prefs.WantRunning
|
|
if wantRunning {
|
|
if err := b.initMachineKeyLocked(); err != nil {
|
|
return fmt.Errorf("initMachineKeyLocked: %w", err)
|
|
}
|
|
}
|
|
|
|
b.inServerMode = b.prefs.ForceDaemon
|
|
b.serverURL = b.prefs.ControlURL
|
|
hostinfo.RoutableIPs = append(hostinfo.RoutableIPs, b.prefs.AdvertiseRoutes...)
|
|
hostinfo.RequestTags = append(hostinfo.RequestTags, b.prefs.AdvertiseTags...)
|
|
if b.inServerMode || runtime.GOOS == "windows" {
|
|
b.logf("Start: serverMode=%v", b.inServerMode)
|
|
}
|
|
applyPrefsToHostinfo(hostinfo, b.prefs)
|
|
|
|
b.setNetMapLocked(nil)
|
|
persistv := b.prefs.Persist
|
|
b.mu.Unlock()
|
|
|
|
b.updateFilter(nil, nil)
|
|
|
|
if b.portpoll != nil {
|
|
b.portpollOnce.Do(func() {
|
|
go b.portpoll.Run(b.ctx)
|
|
go b.readPoller()
|
|
|
|
// Give the poller a second to get results to
|
|
// prevent it from restarting our map poll
|
|
// HTTP request (via doSetHostinfoFilterServices >
|
|
// cli.SetHostinfo). In practice this is very quick.
|
|
t0 := time.Now()
|
|
timer := time.NewTimer(time.Second)
|
|
select {
|
|
case <-b.gotPortPollRes:
|
|
b.logf("got initial portlist info in %v", time.Since(t0).Round(time.Millisecond))
|
|
timer.Stop()
|
|
case <-timer.C:
|
|
b.logf("timeout waiting for initial portlist")
|
|
}
|
|
})
|
|
}
|
|
|
|
var discoPublic tailcfg.DiscoKey
|
|
if controlclient.Debug.Disco {
|
|
discoPublic = b.e.DiscoPublicKey()
|
|
}
|
|
|
|
var err error
|
|
if persistv == nil {
|
|
// let controlclient initialize it
|
|
persistv = &persist.Persist{}
|
|
}
|
|
cc, err := controlclient.New(controlclient.Options{
|
|
GetMachinePrivateKey: b.createGetMachinePrivateKeyFunc(),
|
|
Logf: logger.WithPrefix(b.logf, "control: "),
|
|
Persist: *persistv,
|
|
ServerURL: b.serverURL,
|
|
AuthKey: opts.AuthKey,
|
|
Hostinfo: hostinfo,
|
|
KeepAlive: true,
|
|
NewDecompressor: b.newDecompressor,
|
|
HTTPTestClient: httpTestClient,
|
|
DiscoPublicKey: discoPublic,
|
|
DebugFlags: controlDebugFlags,
|
|
LinkMonitor: b.e.GetLinkMonitor(),
|
|
|
|
// Don't warn about broken Linux IP forwading when
|
|
// netstack is being used.
|
|
SkipIPForwardingCheck: wgengine.IsNetstackRouter(b.e),
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
b.mu.Lock()
|
|
b.cc = cc
|
|
endpoints := b.endpoints
|
|
b.mu.Unlock()
|
|
|
|
if endpoints != nil {
|
|
cc.UpdateEndpoints(0, endpoints)
|
|
}
|
|
|
|
cc.SetStatusFunc(b.setClientStatus)
|
|
b.e.SetStatusCallback(b.setWgengineStatus)
|
|
b.e.SetNetInfoCallback(b.setNetInfo)
|
|
|
|
b.mu.Lock()
|
|
prefs := b.prefs.Clone()
|
|
b.mu.Unlock()
|
|
|
|
blid := b.backendLogID
|
|
b.logf("Backend: logs: be:%v fe:%v", blid, opts.FrontendLogID)
|
|
b.send(ipn.Notify{BackendLogID: &blid})
|
|
b.send(ipn.Notify{Prefs: prefs})
|
|
|
|
if wantRunning {
|
|
cc.Login(nil, controlclient.LoginDefault)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// updateFilter updates the packet filter in wgengine based on the
|
|
// given netMap and user preferences.
|
|
func (b *LocalBackend) updateFilter(netMap *netmap.NetworkMap, prefs *ipn.Prefs) {
|
|
// NOTE(danderson): keep change detection as the first thing in
|
|
// this function. Don't try to optimize by returning early, more
|
|
// likely than not you'll just end up breaking the change
|
|
// detection and end up with the wrong filter installed. This is
|
|
// quite hard to debug, so save yourself the trouble.
|
|
var (
|
|
haveNetmap = netMap != nil
|
|
addrs []netaddr.IPPrefix
|
|
packetFilter []filter.Match
|
|
localNetsB netaddr.IPSetBuilder
|
|
logNetsB netaddr.IPSetBuilder
|
|
shieldsUp = prefs == nil || prefs.ShieldsUp // Be conservative when not ready
|
|
)
|
|
// Log traffic for Tailscale IPs.
|
|
logNetsB.AddPrefix(tsaddr.CGNATRange())
|
|
logNetsB.AddPrefix(tsaddr.TailscaleULARange())
|
|
logNetsB.RemovePrefix(tsaddr.ChromeOSVMRange())
|
|
if haveNetmap {
|
|
addrs = netMap.Addresses
|
|
for _, p := range addrs {
|
|
localNetsB.AddPrefix(p)
|
|
}
|
|
packetFilter = netMap.PacketFilter
|
|
}
|
|
if prefs != nil {
|
|
for _, r := range prefs.AdvertiseRoutes {
|
|
if r.Bits == 0 {
|
|
// When offering a default route to the world, we
|
|
// filter out locally reachable LANs, so that the
|
|
// default route effectively appears to be a "guest
|
|
// wifi": you get internet access, but to additionally
|
|
// get LAN access the LAN(s) need to be offered
|
|
// explicitly as well.
|
|
s, err := shrinkDefaultRoute(r)
|
|
if err != nil {
|
|
b.logf("computing default route filter: %v", err)
|
|
continue
|
|
}
|
|
localNetsB.AddSet(s)
|
|
} else {
|
|
localNetsB.AddPrefix(r)
|
|
// When advertising a non-default route, we assume
|
|
// this is a corporate subnet that should be present
|
|
// in the audit logs.
|
|
logNetsB.AddPrefix(r)
|
|
}
|
|
}
|
|
}
|
|
localNets := localNetsB.IPSet()
|
|
logNets := logNetsB.IPSet()
|
|
|
|
changed := deepprint.UpdateHash(&b.filterHash, haveNetmap, addrs, packetFilter, localNets.Ranges(), logNets.Ranges(), shieldsUp)
|
|
if !changed {
|
|
return
|
|
}
|
|
|
|
if !haveNetmap {
|
|
b.logf("netmap packet filter: (not ready yet)")
|
|
b.e.SetFilter(filter.NewAllowNone(b.logf, logNets))
|
|
return
|
|
}
|
|
|
|
oldFilter := b.e.GetFilter()
|
|
if shieldsUp {
|
|
b.logf("netmap packet filter: (shields up)")
|
|
b.e.SetFilter(filter.NewShieldsUpFilter(localNets, logNets, oldFilter, b.logf))
|
|
} else {
|
|
b.logf("netmap packet filter: %v", packetFilter)
|
|
b.e.SetFilter(filter.New(packetFilter, localNets, logNets, oldFilter, b.logf))
|
|
}
|
|
}
|
|
|
|
var removeFromDefaultRoute = []netaddr.IPPrefix{
|
|
// RFC1918 LAN ranges
|
|
netaddr.MustParseIPPrefix("192.168.0.0/16"),
|
|
netaddr.MustParseIPPrefix("172.16.0.0/12"),
|
|
netaddr.MustParseIPPrefix("10.0.0.0/8"),
|
|
// IPv4 link-local
|
|
netaddr.MustParseIPPrefix("169.254.0.0/16"),
|
|
// IPv4 multicast
|
|
netaddr.MustParseIPPrefix("224.0.0.0/4"),
|
|
// Tailscale IPv4 range
|
|
tsaddr.CGNATRange(),
|
|
// IPv6 Link-local addresses
|
|
netaddr.MustParseIPPrefix("fe80::/10"),
|
|
// IPv6 multicast
|
|
netaddr.MustParseIPPrefix("ff00::/8"),
|
|
// Tailscale IPv6 range
|
|
tsaddr.TailscaleULARange(),
|
|
}
|
|
|
|
func interfaceRoutes() (ips *netaddr.IPSet, hostIPs []netaddr.IP, err error) {
|
|
var b netaddr.IPSetBuilder
|
|
if err := interfaces.ForeachInterfaceAddress(func(_ interfaces.Interface, pfx netaddr.IPPrefix) {
|
|
if tsaddr.IsTailscaleIP(pfx.IP) {
|
|
return
|
|
}
|
|
if pfx.IsSingleIP() {
|
|
return
|
|
}
|
|
hostIPs = append(hostIPs, pfx.IP)
|
|
b.AddPrefix(pfx)
|
|
}); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
return b.IPSet(), hostIPs, nil
|
|
}
|
|
|
|
// shrinkDefaultRoute returns an IPSet representing the IPs in route,
|
|
// minus those in removeFromDefaultRoute and local interface subnets.
|
|
func shrinkDefaultRoute(route netaddr.IPPrefix) (*netaddr.IPSet, error) {
|
|
interfaceRoutes, hostIPs, err := interfaceRoutes()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var b netaddr.IPSetBuilder
|
|
// Add the default route.
|
|
b.AddPrefix(route)
|
|
// Remove the local interface routes.
|
|
b.RemoveSet(interfaceRoutes)
|
|
|
|
// Having removed all the LAN subnets, re-add the hosts's own
|
|
// IPs. It's fine for clients to connect to an exit node's public
|
|
// IP address, just not the attached subnet.
|
|
//
|
|
// Truly forbidden subnets (in removeFromDefaultRoute) will still
|
|
// be stripped back out by the next step.
|
|
for _, ip := range hostIPs {
|
|
if route.Contains(ip) {
|
|
b.Add(ip)
|
|
}
|
|
}
|
|
|
|
for _, pfx := range removeFromDefaultRoute {
|
|
b.RemovePrefix(pfx)
|
|
}
|
|
return b.IPSet(), nil
|
|
}
|
|
|
|
// dnsCIDRsEqual determines whether two CIDR lists are equal
|
|
// for DNS map construction purposes (that is, only the first entry counts).
|
|
func dnsCIDRsEqual(newAddr, oldAddr []netaddr.IPPrefix) bool {
|
|
if len(newAddr) != len(oldAddr) {
|
|
return false
|
|
}
|
|
if len(newAddr) == 0 || newAddr[0] == oldAddr[0] {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// dnsMapsEqual determines whether the new and the old network map
|
|
// induce the same DNS map. It does so without allocating memory,
|
|
// at the expense of giving false negatives if peers are reordered.
|
|
func dnsMapsEqual(new, old *netmap.NetworkMap) bool {
|
|
if (old == nil) != (new == nil) {
|
|
return false
|
|
}
|
|
if old == nil && new == nil {
|
|
return true
|
|
}
|
|
|
|
if len(new.Peers) != len(old.Peers) {
|
|
return false
|
|
}
|
|
|
|
if new.Name != old.Name {
|
|
return false
|
|
}
|
|
if !dnsCIDRsEqual(new.Addresses, old.Addresses) {
|
|
return false
|
|
}
|
|
|
|
for i, newPeer := range new.Peers {
|
|
oldPeer := old.Peers[i]
|
|
if newPeer.Name != oldPeer.Name {
|
|
return false
|
|
}
|
|
if !dnsCIDRsEqual(newPeer.Addresses, oldPeer.Addresses) {
|
|
return false
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
// readPoller is a goroutine that receives service lists from
|
|
// b.portpoll and propagates them into the controlclient's HostInfo.
|
|
func (b *LocalBackend) readPoller() {
|
|
n := 0
|
|
for {
|
|
ports, ok := <-b.portpoll.C
|
|
if !ok {
|
|
return
|
|
}
|
|
sl := []tailcfg.Service{}
|
|
for _, p := range ports {
|
|
s := tailcfg.Service{
|
|
Proto: tailcfg.ServiceProto(p.Proto),
|
|
Port: p.Port,
|
|
Description: p.Process,
|
|
}
|
|
if policy.IsInterestingService(s, version.OS()) {
|
|
sl = append(sl, s)
|
|
}
|
|
}
|
|
|
|
b.mu.Lock()
|
|
if b.hostinfo == nil {
|
|
b.hostinfo = new(tailcfg.Hostinfo)
|
|
}
|
|
b.hostinfo.Services = sl
|
|
hi := b.hostinfo
|
|
b.mu.Unlock()
|
|
|
|
b.doSetHostinfoFilterServices(hi)
|
|
|
|
n++
|
|
if n == 1 {
|
|
close(b.gotPortPollRes)
|
|
}
|
|
}
|
|
}
|
|
|
|
// send delivers n to the connected frontend. If no frontend is
|
|
// connected, the notification is dropped without being delivered.
|
|
func (b *LocalBackend) send(n ipn.Notify) {
|
|
b.mu.Lock()
|
|
notifyFunc := b.notify
|
|
apiSrv := b.peerAPIServer
|
|
b.mu.Unlock()
|
|
|
|
if notifyFunc == nil {
|
|
return
|
|
}
|
|
|
|
if apiSrv != nil && apiSrv.hasFilesWaiting() {
|
|
n.FilesWaiting = &empty.Message{}
|
|
}
|
|
|
|
n.Version = version.Long
|
|
notifyFunc(n)
|
|
}
|
|
|
|
func (b *LocalBackend) sendFileNotify() {
|
|
var n ipn.Notify
|
|
|
|
b.mu.Lock()
|
|
notifyFunc := b.notify
|
|
apiSrv := b.peerAPIServer
|
|
if notifyFunc == nil || apiSrv == nil {
|
|
b.mu.Unlock()
|
|
return
|
|
}
|
|
|
|
// Make sure we always set n.IncomingFiles non-nil so it gets encoded
|
|
// in JSON to clients. They distinguish between empty and non-nil
|
|
// to know whether a Notify should be able about files.
|
|
n.IncomingFiles = make([]ipn.PartialFile, 0)
|
|
for f := range b.incomingFiles {
|
|
n.IncomingFiles = append(n.IncomingFiles, f.PartialFile())
|
|
}
|
|
b.mu.Unlock()
|
|
|
|
sort.Slice(n.IncomingFiles, func(i, j int) bool {
|
|
return n.IncomingFiles[i].Started.Before(n.IncomingFiles[j].Started)
|
|
})
|
|
|
|
b.send(n)
|
|
}
|
|
|
|
// popBrowserAuthNow shuts down the data plane and sends an auth URL
|
|
// to the connected frontend, if any.
|
|
func (b *LocalBackend) popBrowserAuthNow() {
|
|
b.mu.Lock()
|
|
url := b.authURL
|
|
b.interact = false
|
|
b.authURL = ""
|
|
b.mu.Unlock()
|
|
|
|
b.logf("popBrowserAuthNow: url=%v", url != "")
|
|
|
|
b.blockEngineUpdates(true)
|
|
b.stopEngineAndWait()
|
|
b.send(ipn.Notify{BrowseToURL: &url})
|
|
if b.State() == ipn.Running {
|
|
b.enterState(ipn.Starting)
|
|
}
|
|
}
|
|
|
|
// For testing lazy machine key generation.
|
|
var panicOnMachineKeyGeneration, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_PANIC_MACHINE_KEY"))
|
|
|
|
func (b *LocalBackend) createGetMachinePrivateKeyFunc() func() (wgkey.Private, error) {
|
|
var cache atomic.Value
|
|
return func() (wgkey.Private, error) {
|
|
if panicOnMachineKeyGeneration {
|
|
panic("machine key generated")
|
|
}
|
|
if v, ok := cache.Load().(wgkey.Private); ok {
|
|
return v, nil
|
|
}
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if v, ok := cache.Load().(wgkey.Private); ok {
|
|
return v, nil
|
|
}
|
|
if err := b.initMachineKeyLocked(); err != nil {
|
|
return wgkey.Private{}, err
|
|
}
|
|
cache.Store(b.machinePrivKey)
|
|
return b.machinePrivKey, nil
|
|
}
|
|
}
|
|
|
|
// initMachineKeyLocked is called to initialize b.machinePrivKey.
|
|
//
|
|
// b.prefs must already be initialized.
|
|
// b.stateKey should be set too, but just for nicer log messages.
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) initMachineKeyLocked() (err error) {
|
|
if !b.machinePrivKey.IsZero() {
|
|
// Already set.
|
|
return nil
|
|
}
|
|
|
|
var legacyMachineKey wgkey.Private
|
|
if b.prefs.Persist != nil {
|
|
legacyMachineKey = b.prefs.Persist.LegacyFrontendPrivateMachineKey
|
|
}
|
|
|
|
keyText, err := b.store.ReadState(ipn.MachineKeyStateKey)
|
|
if err == nil {
|
|
if err := b.machinePrivKey.UnmarshalText(keyText); err != nil {
|
|
return fmt.Errorf("invalid key in %s key of %v: %w", ipn.MachineKeyStateKey, b.store, err)
|
|
}
|
|
if b.machinePrivKey.IsZero() {
|
|
return fmt.Errorf("invalid zero key stored in %v key of %v", ipn.MachineKeyStateKey, b.store)
|
|
}
|
|
if !legacyMachineKey.IsZero() && !bytes.Equal(legacyMachineKey[:], b.machinePrivKey[:]) {
|
|
b.logf("frontend-provided legacy machine key ignored; used value from server state")
|
|
}
|
|
return nil
|
|
}
|
|
if err != ipn.ErrStateNotExist {
|
|
return fmt.Errorf("error reading %v key of %v: %w", ipn.MachineKeyStateKey, b.store, err)
|
|
}
|
|
|
|
// If we didn't find one already on disk and the prefs already
|
|
// have a legacy machine key, use that. Otherwise generate a
|
|
// new one.
|
|
if !legacyMachineKey.IsZero() {
|
|
if b.stateKey == "" {
|
|
b.logf("using frontend-provided legacy machine key")
|
|
} else {
|
|
b.logf("using legacy machine key from state key %q", b.stateKey)
|
|
}
|
|
b.machinePrivKey = legacyMachineKey
|
|
} else {
|
|
b.logf("generating new machine key")
|
|
var err error
|
|
b.machinePrivKey, err = wgkey.NewPrivate()
|
|
if err != nil {
|
|
return fmt.Errorf("initializing new machine key: %w", err)
|
|
}
|
|
}
|
|
|
|
keyText, _ = b.machinePrivKey.MarshalText()
|
|
if err := b.store.WriteState(ipn.MachineKeyStateKey, keyText); err != nil {
|
|
b.logf("error writing machine key to store: %v", err)
|
|
return err
|
|
}
|
|
|
|
b.logf("machine key written to store")
|
|
return nil
|
|
}
|
|
|
|
// writeServerModeStartState stores the ServerModeStartKey value based on the current
|
|
// user and prefs. If userID is blank or prefs is blank, no work is done.
|
|
//
|
|
// b.mu may either be held or not.
|
|
func (b *LocalBackend) writeServerModeStartState(userID string, prefs *ipn.Prefs) {
|
|
if userID == "" || prefs == nil {
|
|
return
|
|
}
|
|
|
|
if prefs.ForceDaemon {
|
|
stateKey := ipn.StateKey("user-" + userID)
|
|
if err := b.store.WriteState(ipn.ServerModeStartKey, []byte(stateKey)); err != nil {
|
|
b.logf("WriteState error: %v", err)
|
|
}
|
|
// It's important we do this here too, even if it looks
|
|
// redundant with the one in the 'if stateKey != ""'
|
|
// check block above. That one won't fire in the case
|
|
// where the Windows client started up in client mode.
|
|
// This happens when we transition into server mode:
|
|
if err := b.store.WriteState(stateKey, prefs.ToBytes()); err != nil {
|
|
b.logf("WriteState error: %v", err)
|
|
}
|
|
} else {
|
|
if err := b.store.WriteState(ipn.ServerModeStartKey, nil); err != nil {
|
|
b.logf("WriteState error: %v", err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// loadStateLocked sets b.prefs and b.stateKey based on a complex
|
|
// combination of key, prefs, and legacyPath. b.mu must be held when
|
|
// calling.
|
|
func (b *LocalBackend) loadStateLocked(key ipn.StateKey, prefs *ipn.Prefs) (err error) {
|
|
if prefs == nil && key == "" {
|
|
panic("state key and prefs are both unset")
|
|
}
|
|
|
|
// Optimistically set stateKey (for initMachineKeyLocked's
|
|
// logging), but revert it if we return an error so a later SetPrefs
|
|
// call can't pick it up if it's bogus.
|
|
b.stateKey = key
|
|
defer func() {
|
|
if err != nil {
|
|
b.stateKey = ""
|
|
}
|
|
}()
|
|
|
|
if key == "" {
|
|
// Frontend owns the state, we just need to obey it.
|
|
//
|
|
// If the frontend (e.g. on Windows) supplied the
|
|
// optional/legacy machine key then it's used as the
|
|
// value instead of making up a new one.
|
|
b.logf("using frontend prefs: %s", prefs.Pretty())
|
|
b.prefs = prefs.Clone()
|
|
b.writeServerModeStartState(b.userID, b.prefs)
|
|
return nil
|
|
}
|
|
|
|
if prefs != nil {
|
|
// Backend owns the state, but frontend is trying to migrate
|
|
// state into the backend.
|
|
b.logf("importing frontend prefs into backend store; frontend prefs: %s", prefs.Pretty())
|
|
if err := b.store.WriteState(key, prefs.ToBytes()); err != nil {
|
|
return fmt.Errorf("store.WriteState: %v", err)
|
|
}
|
|
}
|
|
|
|
b.logf("using backend prefs")
|
|
bs, err := b.store.ReadState(key)
|
|
switch {
|
|
case errors.Is(err, ipn.ErrStateNotExist):
|
|
b.prefs = ipn.NewPrefs()
|
|
b.prefs.WantRunning = false
|
|
b.logf("created empty state for %q: %s", key, b.prefs.Pretty())
|
|
return nil
|
|
case err != nil:
|
|
return fmt.Errorf("store.ReadState(%q): %v", key, err)
|
|
}
|
|
b.prefs, err = ipn.PrefsFromBytes(bs, false)
|
|
if err != nil {
|
|
return fmt.Errorf("PrefsFromBytes: %v", err)
|
|
}
|
|
b.logf("backend prefs for %q: %s", key, b.prefs.Pretty())
|
|
return nil
|
|
}
|
|
|
|
// State returns the backend state machine's current state.
|
|
func (b *LocalBackend) State() ipn.State {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
return b.state
|
|
}
|
|
|
|
func (b *LocalBackend) InServerMode() bool {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.inServerMode
|
|
}
|
|
|
|
// getEngineStatus returns a copy of b.engineStatus.
|
|
//
|
|
// TODO(bradfitz): remove this and use Status() throughout.
|
|
func (b *LocalBackend) getEngineStatus() ipn.EngineStatus {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
return b.engineStatus
|
|
}
|
|
|
|
// Login implements Backend.
|
|
func (b *LocalBackend) Login(token *tailcfg.Oauth2Token) {
|
|
b.mu.Lock()
|
|
b.assertClientLocked()
|
|
cc := b.cc
|
|
b.mu.Unlock()
|
|
|
|
cc.Login(token, controlclient.LoginInteractive)
|
|
}
|
|
|
|
// StartLoginInteractive implements Backend. It requests a new
|
|
// interactive login from controlclient, unless such a flow is already
|
|
// in progress, in which case StartLoginInteractive attempts to pick
|
|
// up the in-progress flow where it left off.
|
|
func (b *LocalBackend) StartLoginInteractive() {
|
|
b.mu.Lock()
|
|
b.assertClientLocked()
|
|
b.interact = true
|
|
url := b.authURL
|
|
cc := b.cc
|
|
b.mu.Unlock()
|
|
b.logf("StartLoginInteractive: url=%v", url != "")
|
|
|
|
if url != "" {
|
|
b.popBrowserAuthNow()
|
|
} else {
|
|
cc.Login(nil, controlclient.LoginInteractive)
|
|
}
|
|
}
|
|
|
|
// FakeExpireAfter implements Backend.
|
|
func (b *LocalBackend) FakeExpireAfter(x time.Duration) {
|
|
b.logf("FakeExpireAfter: %v", x)
|
|
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
if b.netMap == nil {
|
|
return
|
|
}
|
|
|
|
// This function is called very rarely,
|
|
// so we prefer to fully copy the netmap over introducing in-place modification here.
|
|
mapCopy := *b.netMap
|
|
e := mapCopy.Expiry
|
|
if e.IsZero() || time.Until(e) > x {
|
|
mapCopy.Expiry = time.Now().Add(x)
|
|
}
|
|
b.setNetMapLocked(&mapCopy)
|
|
b.send(ipn.Notify{NetMap: b.netMap})
|
|
}
|
|
|
|
func (b *LocalBackend) Ping(ipStr string, useTSMP bool) {
|
|
ip, err := netaddr.ParseIP(ipStr)
|
|
if err != nil {
|
|
b.logf("ignoring Ping request to invalid IP %q", ipStr)
|
|
return
|
|
}
|
|
b.e.Ping(ip, useTSMP, func(pr *ipnstate.PingResult) {
|
|
b.send(ipn.Notify{PingResult: pr})
|
|
})
|
|
}
|
|
|
|
// parseWgStatusLocked returns an EngineStatus based on s.
|
|
//
|
|
// b.mu must be held; mostly because the caller is about to anyway, and doing so
|
|
// gives us slightly better guarantees about the two peers stats lines not
|
|
// being intermixed if there are concurrent calls to our caller.
|
|
func (b *LocalBackend) parseWgStatusLocked(s *wgengine.Status) (ret ipn.EngineStatus) {
|
|
var peerStats, peerKeys strings.Builder
|
|
|
|
ret.LiveDERPs = s.DERPs
|
|
ret.LivePeers = map[tailcfg.NodeKey]ipnstate.PeerStatusLite{}
|
|
for _, p := range s.Peers {
|
|
if !p.LastHandshake.IsZero() {
|
|
fmt.Fprintf(&peerStats, "%d/%d ", p.RxBytes, p.TxBytes)
|
|
fmt.Fprintf(&peerKeys, "%s ", p.NodeKey.ShortString())
|
|
|
|
ret.NumLive++
|
|
ret.LivePeers[p.NodeKey] = p
|
|
|
|
}
|
|
ret.RBytes += p.RxBytes
|
|
ret.WBytes += p.TxBytes
|
|
}
|
|
|
|
// [GRINDER STATS LINES] - please don't remove (used for log parsing)
|
|
if peerStats.Len() > 0 {
|
|
b.keyLogf("[v1] peer keys: %s", strings.TrimSpace(peerKeys.String()))
|
|
b.statsLogf("[v1] v%v peers: %v", version.Long, strings.TrimSpace(peerStats.String()))
|
|
}
|
|
return ret
|
|
}
|
|
|
|
// shouldUploadServices reports whether this node should include services
|
|
// in Hostinfo. When the user preferences currently request "shields up"
|
|
// mode, all inbound connections are refused, so services are not reported.
|
|
// Otherwise, shouldUploadServices respects NetMap.CollectServices.
|
|
func (b *LocalBackend) shouldUploadServices() bool {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
if b.prefs == nil || b.netMap == nil {
|
|
return false // default to safest setting
|
|
}
|
|
return !b.prefs.ShieldsUp && b.netMap.CollectServices
|
|
}
|
|
|
|
func (b *LocalBackend) SetCurrentUserID(uid string) {
|
|
b.mu.Lock()
|
|
b.userID = uid
|
|
b.mu.Unlock()
|
|
}
|
|
|
|
func (b *LocalBackend) EditPrefs(mp *ipn.MaskedPrefs) (*ipn.Prefs, error) {
|
|
b.mu.Lock()
|
|
p0 := b.prefs.Clone()
|
|
p1 := b.prefs.Clone()
|
|
p1.ApplyEdits(mp)
|
|
if p1.Equals(p0) {
|
|
b.mu.Unlock()
|
|
return p1, nil
|
|
}
|
|
cc := b.cc
|
|
b.logf("EditPrefs: %v", mp.Pretty())
|
|
b.setPrefsLockedOnEntry("EditPrefs", p1) // does a b.mu.Unlock
|
|
|
|
if !p0.WantRunning && p1.WantRunning {
|
|
b.logf("EditPrefs: transitioning to running; doing Login...")
|
|
cc.Login(nil, controlclient.LoginDefault)
|
|
}
|
|
return p1, nil
|
|
}
|
|
|
|
// SetPrefs saves new user preferences and propagates them throughout
|
|
// the system. Implements Backend.
|
|
func (b *LocalBackend) SetPrefs(newp *ipn.Prefs) {
|
|
if newp == nil {
|
|
panic("SetPrefs got nil prefs")
|
|
}
|
|
b.mu.Lock()
|
|
b.setPrefsLockedOnEntry("SetPrefs", newp)
|
|
}
|
|
|
|
// setPrefsLockedOnEntry requires b.mu be held to call it, but it
|
|
// unlocks b.mu when done.
|
|
func (b *LocalBackend) setPrefsLockedOnEntry(caller string, newp *ipn.Prefs) {
|
|
netMap := b.netMap
|
|
stateKey := b.stateKey
|
|
|
|
oldp := b.prefs
|
|
newp.Persist = oldp.Persist // caller isn't allowed to override this
|
|
b.prefs = newp
|
|
b.inServerMode = newp.ForceDaemon
|
|
// We do this to avoid holding the lock while doing everything else.
|
|
newp = b.prefs.Clone()
|
|
|
|
oldHi := b.hostinfo
|
|
newHi := oldHi.Clone()
|
|
newHi.RoutableIPs = append([]netaddr.IPPrefix(nil), b.prefs.AdvertiseRoutes...)
|
|
applyPrefsToHostinfo(newHi, newp)
|
|
b.hostinfo = newHi
|
|
hostInfoChanged := !oldHi.Equal(newHi)
|
|
userID := b.userID
|
|
|
|
b.mu.Unlock()
|
|
|
|
if stateKey != "" {
|
|
if err := b.store.WriteState(stateKey, newp.ToBytes()); err != nil {
|
|
b.logf("failed to save new controlclient state: %v", err)
|
|
}
|
|
}
|
|
b.writeServerModeStartState(userID, newp)
|
|
|
|
// [GRINDER STATS LINE] - please don't remove (used for log parsing)
|
|
if caller == "SetPrefs" {
|
|
b.logf("SetPrefs: %v", newp.Pretty())
|
|
}
|
|
if netMap != nil {
|
|
if login := netMap.UserProfiles[netMap.User].LoginName; login != "" {
|
|
if newp.Persist == nil {
|
|
b.logf("active login: %s", login)
|
|
} else if newp.Persist.LoginName != login {
|
|
// Corp issue 461: sometimes the wrong prefs are
|
|
// logged; the frontend isn't always getting
|
|
// notified (to update its prefs/persist) on
|
|
// account switch. Log this while we figure it
|
|
// out.
|
|
b.logf("active login: %s ([unexpected] corp#461, not %s)", newp.Persist.LoginName)
|
|
}
|
|
}
|
|
}
|
|
|
|
if oldp.ShieldsUp != newp.ShieldsUp || hostInfoChanged {
|
|
b.doSetHostinfoFilterServices(newHi)
|
|
}
|
|
|
|
b.updateFilter(netMap, newp)
|
|
|
|
if netMap != nil {
|
|
b.e.SetDERPMap(netMap.DERPMap)
|
|
}
|
|
|
|
if oldp.WantRunning != newp.WantRunning {
|
|
b.stateMachine()
|
|
} else {
|
|
b.authReconfig()
|
|
}
|
|
|
|
b.send(ipn.Notify{Prefs: newp})
|
|
}
|
|
|
|
func (b *LocalBackend) getPeerAPIPortForTSMPPing(ip netaddr.IP) (port uint16, ok bool) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
for _, pln := range b.peerAPIListeners {
|
|
if pln.ip == ip {
|
|
return uint16(pln.port), true
|
|
}
|
|
}
|
|
return 0, false
|
|
}
|
|
|
|
func (b *LocalBackend) peerAPIServicesLocked() (ret []tailcfg.Service) {
|
|
for _, pln := range b.peerAPIListeners {
|
|
proto := tailcfg.ServiceProto("peerapi4")
|
|
if pln.ip.Is6() {
|
|
proto = "peerapi6"
|
|
}
|
|
ret = append(ret, tailcfg.Service{
|
|
Proto: proto,
|
|
Port: uint16(pln.port),
|
|
})
|
|
}
|
|
return ret
|
|
}
|
|
|
|
// doSetHostinfoFilterServices calls SetHostinfo on the controlclient,
|
|
// possibly after mangling the given hostinfo.
|
|
//
|
|
// TODO(danderson): we shouldn't be mangling hostinfo here after
|
|
// painstakingly constructing it in twelvety other places.
|
|
func (b *LocalBackend) doSetHostinfoFilterServices(hi *tailcfg.Hostinfo) {
|
|
if hi == nil {
|
|
b.logf("[unexpected] doSetHostinfoFilterServices with nil hostinfo")
|
|
return
|
|
}
|
|
b.mu.Lock()
|
|
cc := b.cc
|
|
if cc == nil {
|
|
// Control client isn't up yet.
|
|
b.mu.Unlock()
|
|
return
|
|
}
|
|
peerAPIServices := b.peerAPIServicesLocked()
|
|
b.mu.Unlock()
|
|
|
|
// Make a shallow copy of hostinfo so we can mutate
|
|
// at the Service field.
|
|
hi2 := *hi // shallow copy
|
|
if !b.shouldUploadServices() {
|
|
hi2.Services = []tailcfg.Service{}
|
|
}
|
|
// Don't mutate hi.Service's underlying array. Append to
|
|
// the slice with no free capacity.
|
|
c := len(hi2.Services)
|
|
hi2.Services = append(hi2.Services[:c:c], peerAPIServices...)
|
|
cc.SetHostinfo(&hi2)
|
|
}
|
|
|
|
// NetMap returns the latest cached network map received from
|
|
// controlclient, or nil if no network map was received yet.
|
|
func (b *LocalBackend) NetMap() *netmap.NetworkMap {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.netMap
|
|
}
|
|
|
|
// blockEngineUpdate sets b.blocked to block, while holding b.mu. Its
|
|
// indirect effect is to turn b.authReconfig() into a no-op if block
|
|
// is true.
|
|
func (b *LocalBackend) blockEngineUpdates(block bool) {
|
|
b.logf("blockEngineUpdates(%v)", block)
|
|
|
|
b.mu.Lock()
|
|
b.blocked = block
|
|
b.mu.Unlock()
|
|
}
|
|
|
|
// authReconfig pushes a new configuration into wgengine, if engine
|
|
// updates are not currently blocked, based on the cached netmap and
|
|
// user prefs.
|
|
func (b *LocalBackend) authReconfig() {
|
|
b.mu.Lock()
|
|
blocked := b.blocked
|
|
uc := b.prefs
|
|
nm := b.netMap
|
|
hasPAC := b.prevIfState.HasPAC()
|
|
disableSubnetsIfPAC := nm != nil && nm.Debug != nil && nm.Debug.DisableSubnetsIfPAC.EqualBool(true)
|
|
b.mu.Unlock()
|
|
|
|
if blocked {
|
|
b.logf("authReconfig: blocked, skipping.")
|
|
return
|
|
}
|
|
if nm == nil {
|
|
b.logf("authReconfig: netmap not yet valid. Skipping.")
|
|
return
|
|
}
|
|
if !uc.WantRunning {
|
|
b.logf("authReconfig: skipping because !WantRunning.")
|
|
return
|
|
}
|
|
|
|
var flags netmap.WGConfigFlags
|
|
if uc.RouteAll {
|
|
flags |= netmap.AllowSubnetRoutes
|
|
}
|
|
if uc.AllowSingleHosts {
|
|
flags |= netmap.AllowSingleHosts
|
|
}
|
|
if hasPAC && disableSubnetsIfPAC {
|
|
if flags&netmap.AllowSubnetRoutes != 0 {
|
|
b.logf("authReconfig: have PAC; disabling subnet routes")
|
|
flags &^= netmap.AllowSubnetRoutes
|
|
}
|
|
}
|
|
|
|
cfg, err := nmcfg.WGCfg(nm, b.logf, flags, uc.ExitNodeID)
|
|
if err != nil {
|
|
b.logf("wgcfg: %v", err)
|
|
return
|
|
}
|
|
|
|
rcfg := b.routerConfig(cfg, uc)
|
|
|
|
var dcfg dns.Config
|
|
|
|
// If CorpDNS is false, dcfg remains the zero value.
|
|
if uc.CorpDNS {
|
|
for _, resolver := range nm.DNS.Resolvers {
|
|
res, err := parseResolver(resolver)
|
|
if err != nil {
|
|
b.logf(err.Error())
|
|
continue
|
|
}
|
|
dcfg.DefaultResolvers = append(dcfg.DefaultResolvers, res)
|
|
}
|
|
if len(nm.DNS.Routes) > 0 {
|
|
dcfg.Routes = map[dnsname.FQDN][]netaddr.IPPort{}
|
|
}
|
|
for suffix, resolvers := range nm.DNS.Routes {
|
|
fqdn, err := dnsname.ToFQDN(suffix)
|
|
if err != nil {
|
|
b.logf("[unexpected] non-FQDN route suffix %q", suffix)
|
|
}
|
|
for _, resolver := range resolvers {
|
|
res, err := parseResolver(resolver)
|
|
if err != nil {
|
|
b.logf(err.Error())
|
|
continue
|
|
}
|
|
dcfg.Routes[fqdn] = append(dcfg.Routes[fqdn], res)
|
|
}
|
|
}
|
|
for _, dom := range nm.DNS.Domains {
|
|
fqdn, err := dnsname.ToFQDN(dom)
|
|
if err != nil {
|
|
b.logf("[unexpected] non-FQDN search domain %q", dom)
|
|
}
|
|
dcfg.SearchDomains = append(dcfg.SearchDomains, fqdn)
|
|
}
|
|
dcfg.AuthoritativeSuffixes = magicDNSRootDomains(nm)
|
|
set := func(name string, addrs []netaddr.IPPrefix) {
|
|
if len(addrs) == 0 || name == "" {
|
|
return
|
|
}
|
|
fqdn, err := dnsname.ToFQDN(name)
|
|
if err != nil {
|
|
return // TODO: propagate error?
|
|
}
|
|
var ips []netaddr.IP
|
|
for _, addr := range addrs {
|
|
ips = append(ips, addr.IP)
|
|
}
|
|
dcfg.Hosts[fqdn] = ips
|
|
}
|
|
if nm.DNS.Proxied { // actually means "enable MagicDNS"
|
|
dcfg.Hosts = map[dnsname.FQDN][]netaddr.IP{}
|
|
set(nm.Name, nm.Addresses)
|
|
for _, peer := range nm.Peers {
|
|
set(peer.Name, peer.Addresses)
|
|
}
|
|
}
|
|
}
|
|
|
|
err = b.e.Reconfig(cfg, rcfg, &dcfg)
|
|
if err == wgengine.ErrNoChanges {
|
|
return
|
|
}
|
|
b.logf("[v1] authReconfig: ra=%v dns=%v 0x%02x: %v", uc.RouteAll, uc.CorpDNS, flags, err)
|
|
|
|
b.initPeerAPIListener()
|
|
}
|
|
|
|
func parseResolver(cfg tailcfg.DNSResolver) (netaddr.IPPort, error) {
|
|
ip, err := netaddr.ParseIP(cfg.Addr)
|
|
if err != nil {
|
|
return netaddr.IPPort{}, fmt.Errorf("[unexpected] non-IP resolver %q", cfg.Addr)
|
|
}
|
|
return netaddr.IPPort{
|
|
IP: ip,
|
|
Port: 53,
|
|
}, nil
|
|
}
|
|
|
|
// tailscaleVarRoot returns the root directory of Tailscale's writable
|
|
// storage area. (e.g. "/var/lib/tailscale")
|
|
func tailscaleVarRoot() string {
|
|
if runtime.GOOS == "ios" {
|
|
dir, _ := paths.IOSSharedDir.Load().(string)
|
|
return dir
|
|
}
|
|
stateFile := paths.DefaultTailscaledStateFile()
|
|
if stateFile == "" {
|
|
return ""
|
|
}
|
|
return filepath.Dir(stateFile)
|
|
}
|
|
|
|
func (b *LocalBackend) fileRootLocked(uid tailcfg.UserID) string {
|
|
if v := b.directFileRoot; v != "" {
|
|
return v
|
|
}
|
|
varRoot := tailscaleVarRoot()
|
|
if varRoot == "" {
|
|
b.logf("peerapi disabled; no state directory")
|
|
return ""
|
|
}
|
|
baseDir := fmt.Sprintf("%s-uid-%d",
|
|
strings.ReplaceAll(b.activeLogin, "@", "-"),
|
|
uid)
|
|
dir := filepath.Join(varRoot, "files", baseDir)
|
|
if err := os.MkdirAll(dir, 0700); err != nil {
|
|
b.logf("peerapi disabled; error making directory: %v", err)
|
|
return ""
|
|
}
|
|
return dir
|
|
}
|
|
|
|
func (b *LocalBackend) initPeerAPIListener() {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
if len(b.netMap.Addresses) == len(b.peerAPIListeners) {
|
|
allSame := true
|
|
for i, pln := range b.peerAPIListeners {
|
|
if pln.ip != b.netMap.Addresses[i].IP {
|
|
allSame = false
|
|
break
|
|
}
|
|
}
|
|
if allSame {
|
|
// Nothing to do.
|
|
return
|
|
}
|
|
}
|
|
|
|
b.peerAPIServer = nil
|
|
for _, pln := range b.peerAPIListeners {
|
|
pln.Close()
|
|
}
|
|
b.peerAPIListeners = nil
|
|
|
|
selfNode := b.netMap.SelfNode
|
|
if len(b.netMap.Addresses) == 0 || selfNode == nil {
|
|
return
|
|
}
|
|
|
|
fileRoot := b.fileRootLocked(selfNode.User)
|
|
if fileRoot == "" {
|
|
return
|
|
}
|
|
|
|
var tunName string
|
|
if ge, ok := b.e.(wgengine.InternalsGetter); ok {
|
|
if tunWrap, _, ok := ge.GetInternals(); ok {
|
|
tunName, _ = tunWrap.Name()
|
|
}
|
|
}
|
|
|
|
ps := &peerAPIServer{
|
|
b: b,
|
|
rootDir: fileRoot,
|
|
tunName: tunName,
|
|
selfNode: selfNode,
|
|
directFileMode: b.directFileRoot != "",
|
|
}
|
|
b.peerAPIServer = ps
|
|
|
|
isNetstack := wgengine.IsNetstack(b.e)
|
|
for i, a := range b.netMap.Addresses {
|
|
var ln net.Listener
|
|
var err error
|
|
skipListen := i > 0 && isNetstack
|
|
if !skipListen {
|
|
ln, err = ps.listen(a.IP, b.prevIfState)
|
|
if err != nil {
|
|
b.logf("[unexpected] peerapi listen(%q) error: %v", a.IP, err)
|
|
continue
|
|
}
|
|
}
|
|
pln := &peerAPIListener{
|
|
ps: ps,
|
|
ip: a.IP,
|
|
ln: ln, // nil for 2nd+ on netstack
|
|
lb: b,
|
|
}
|
|
if skipListen {
|
|
pln.port = b.peerAPIListeners[0].port
|
|
} else {
|
|
pln.port = ln.Addr().(*net.TCPAddr).Port
|
|
}
|
|
pln.urlStr = "http://" + net.JoinHostPort(a.IP.String(), strconv.Itoa(pln.port))
|
|
b.logf("peerapi: serving on %s", pln.urlStr)
|
|
go pln.serve()
|
|
b.peerAPIListeners = append(b.peerAPIListeners, pln)
|
|
}
|
|
|
|
go b.doSetHostinfoFilterServices(b.hostinfo.Clone())
|
|
}
|
|
|
|
// magicDNSRootDomains returns the subset of nm.DNS.Domains that are the search domains for MagicDNS.
|
|
func magicDNSRootDomains(nm *netmap.NetworkMap) []dnsname.FQDN {
|
|
if v := nm.MagicDNSSuffix(); v != "" {
|
|
fqdn, err := dnsname.ToFQDN(v)
|
|
if err != nil {
|
|
// TODO: propagate error
|
|
return nil
|
|
}
|
|
return []dnsname.FQDN{fqdn}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
var (
|
|
ipv4Default = netaddr.MustParseIPPrefix("0.0.0.0/0")
|
|
ipv6Default = netaddr.MustParseIPPrefix("::/0")
|
|
)
|
|
|
|
// peerRoutes returns the routerConfig.Routes to access peers.
|
|
// If there are over cgnatThreshold CGNAT routes, one big CGNAT route
|
|
// is used instead.
|
|
func peerRoutes(peers []wgcfg.Peer, cgnatThreshold int) (routes []netaddr.IPPrefix) {
|
|
tsULA := tsaddr.TailscaleULARange()
|
|
cgNAT := tsaddr.CGNATRange()
|
|
var didULA bool
|
|
var cgNATIPs []netaddr.IPPrefix
|
|
for _, peer := range peers {
|
|
for _, aip := range peer.AllowedIPs {
|
|
aip = unmapIPPrefix(aip)
|
|
// Only add the Tailscale IPv6 ULA once, if we see anybody using part of it.
|
|
if aip.IP.Is6() && aip.IsSingleIP() && tsULA.Contains(aip.IP) {
|
|
if !didULA {
|
|
didULA = true
|
|
routes = append(routes, tsULA)
|
|
}
|
|
continue
|
|
}
|
|
if aip.IsSingleIP() && cgNAT.Contains(aip.IP) {
|
|
cgNATIPs = append(cgNATIPs, aip)
|
|
} else {
|
|
routes = append(routes, aip)
|
|
}
|
|
}
|
|
}
|
|
if len(cgNATIPs) > cgnatThreshold {
|
|
// Probably the hello server. Just append one big route.
|
|
routes = append(routes, cgNAT)
|
|
} else {
|
|
routes = append(routes, cgNATIPs...)
|
|
}
|
|
return routes
|
|
}
|
|
|
|
// routerConfig produces a router.Config from a wireguard config and IPN prefs.
|
|
func (b *LocalBackend) routerConfig(cfg *wgcfg.Config, prefs *ipn.Prefs) *router.Config {
|
|
rs := &router.Config{
|
|
LocalAddrs: unmapIPPrefixes(cfg.Addresses),
|
|
SubnetRoutes: unmapIPPrefixes(prefs.AdvertiseRoutes),
|
|
SNATSubnetRoutes: !prefs.NoSNAT,
|
|
NetfilterMode: prefs.NetfilterMode,
|
|
Routes: peerRoutes(cfg.Peers, 10_000),
|
|
}
|
|
|
|
// Sanity check: we expect the control server to program both a v4
|
|
// and a v6 default route, if default routing is on. Fill in
|
|
// blackhole routes appropriately if we're missing some. This is
|
|
// likely to break some functionality, but if the user expressed a
|
|
// preference for routing remotely, we want to avoid leaking
|
|
// traffic at the expense of functionality.
|
|
if prefs.ExitNodeID != "" || !prefs.ExitNodeIP.IsZero() {
|
|
var default4, default6 bool
|
|
for _, route := range rs.Routes {
|
|
switch route {
|
|
case ipv4Default:
|
|
default4 = true
|
|
case ipv6Default:
|
|
default6 = true
|
|
}
|
|
if default4 && default6 {
|
|
break
|
|
}
|
|
}
|
|
if !default4 {
|
|
rs.Routes = append(rs.Routes, ipv4Default)
|
|
}
|
|
if !default6 {
|
|
rs.Routes = append(rs.Routes, ipv6Default)
|
|
}
|
|
ips, _, err := interfaceRoutes()
|
|
if err != nil {
|
|
b.logf("failed to discover interface ips: %v", err)
|
|
}
|
|
if prefs.ExitNodeAllowLANAccess {
|
|
rs.LocalRoutes = ips.Prefixes()
|
|
} else {
|
|
// Explicitly add routes to the local network so that we do not
|
|
// leak any traffic.
|
|
rs.Routes = append(rs.Routes, ips.Prefixes()...)
|
|
}
|
|
}
|
|
|
|
rs.Routes = append(rs.Routes, netaddr.IPPrefix{
|
|
IP: tsaddr.TailscaleServiceIP(),
|
|
Bits: 32,
|
|
})
|
|
|
|
return rs
|
|
}
|
|
|
|
func unmapIPPrefix(ipp netaddr.IPPrefix) netaddr.IPPrefix {
|
|
return netaddr.IPPrefix{IP: ipp.IP.Unmap(), Bits: ipp.Bits}
|
|
}
|
|
|
|
func unmapIPPrefixes(ippsList ...[]netaddr.IPPrefix) (ret []netaddr.IPPrefix) {
|
|
for _, ipps := range ippsList {
|
|
for _, ipp := range ipps {
|
|
ret = append(ret, unmapIPPrefix(ipp))
|
|
}
|
|
}
|
|
return ret
|
|
}
|
|
|
|
func applyPrefsToHostinfo(hi *tailcfg.Hostinfo, prefs *ipn.Prefs) {
|
|
if h := prefs.Hostname; h != "" {
|
|
hi.Hostname = h
|
|
}
|
|
if v := prefs.OSVersion; v != "" {
|
|
hi.OSVersion = v
|
|
}
|
|
if m := prefs.DeviceModel; m != "" {
|
|
hi.DeviceModel = m
|
|
}
|
|
hi.ShieldsUp = prefs.ShieldsUp
|
|
}
|
|
|
|
// enterState transitions the backend into newState, updating internal
|
|
// state and propagating events out as needed.
|
|
//
|
|
// TODO(danderson): while this isn't a lie, exactly, a ton of other
|
|
// places twiddle IPN internal state without going through here, so
|
|
// really this is more "one of several places in which random things
|
|
// happen".
|
|
func (b *LocalBackend) enterState(newState ipn.State) {
|
|
b.mu.Lock()
|
|
state := b.state
|
|
b.state = newState
|
|
prefs := b.prefs
|
|
cc := b.cc
|
|
networkUp := b.prevIfState.AnyInterfaceUp()
|
|
activeLogin := b.activeLogin
|
|
authURL := b.authURL
|
|
b.mu.Unlock()
|
|
|
|
if state == newState {
|
|
return
|
|
}
|
|
b.logf("Switching ipn state %v -> %v (WantRunning=%v)",
|
|
state, newState, prefs.WantRunning)
|
|
health.SetIPNState(newState.String(), prefs.WantRunning)
|
|
b.send(ipn.Notify{State: &newState})
|
|
|
|
if cc != nil {
|
|
cc.SetPaused(newState == ipn.Stopped || !networkUp)
|
|
}
|
|
|
|
switch newState {
|
|
case ipn.NeedsLogin:
|
|
systemd.Status("Needs login: %s", authURL)
|
|
b.blockEngineUpdates(true)
|
|
fallthrough
|
|
case ipn.Stopped:
|
|
err := b.e.Reconfig(&wgcfg.Config{}, &router.Config{}, &dns.Config{})
|
|
if err != nil {
|
|
b.logf("Reconfig(down): %v", err)
|
|
}
|
|
|
|
if authURL == "" {
|
|
systemd.Status("Stopped; run 'tailscale up' to log in")
|
|
}
|
|
case ipn.Starting, ipn.NeedsMachineAuth:
|
|
b.authReconfig()
|
|
// Needed so that UpdateEndpoints can run
|
|
b.e.RequestStatus()
|
|
case ipn.Running:
|
|
var addrs []string
|
|
for _, addr := range b.netMap.Addresses {
|
|
addrs = append(addrs, addr.IP.String())
|
|
}
|
|
systemd.Status("Connected; %s; %s", activeLogin, strings.Join(addrs, " "))
|
|
default:
|
|
b.logf("[unexpected] unknown newState %#v", newState)
|
|
}
|
|
|
|
}
|
|
|
|
// nextState returns the state the backend seems to be in, based on
|
|
// its internal state.
|
|
func (b *LocalBackend) nextState() ipn.State {
|
|
b.mu.Lock()
|
|
b.assertClientLocked()
|
|
var (
|
|
cc = b.cc
|
|
netMap = b.netMap
|
|
state = b.state
|
|
wantRunning = b.prefs.WantRunning
|
|
)
|
|
b.mu.Unlock()
|
|
|
|
switch {
|
|
case netMap == nil:
|
|
if cc.AuthCantContinue() {
|
|
// Auth was interrupted or waiting for URL visit,
|
|
// so it won't proceed without human help.
|
|
return ipn.NeedsLogin
|
|
} else {
|
|
// Auth or map request needs to finish
|
|
return state
|
|
}
|
|
case !wantRunning:
|
|
return ipn.Stopped
|
|
case !netMap.Expiry.IsZero() && time.Until(netMap.Expiry) <= 0:
|
|
return ipn.NeedsLogin
|
|
case netMap.MachineStatus != tailcfg.MachineAuthorized:
|
|
// TODO(crawshaw): handle tailcfg.MachineInvalid
|
|
return ipn.NeedsMachineAuth
|
|
case state == ipn.NeedsMachineAuth:
|
|
// (if we get here, we know MachineAuthorized == true)
|
|
return ipn.Starting
|
|
case state == ipn.Starting:
|
|
if st := b.getEngineStatus(); st.NumLive > 0 || st.LiveDERPs > 0 {
|
|
return ipn.Running
|
|
} else {
|
|
return state
|
|
}
|
|
case state == ipn.Running:
|
|
return ipn.Running
|
|
default:
|
|
return ipn.Starting
|
|
}
|
|
}
|
|
|
|
// RequestEngineStatus implements Backend.
|
|
func (b *LocalBackend) RequestEngineStatus() {
|
|
b.e.RequestStatus()
|
|
}
|
|
|
|
// stateMachine updates the state machine state based on other things
|
|
// that have happened. It is invoked from the various callbacks that
|
|
// feed events into LocalBackend.
|
|
//
|
|
// TODO(apenwarr): use a channel or something to prevent re-entrancy?
|
|
// Or maybe just call the state machine from fewer places.
|
|
func (b *LocalBackend) stateMachine() {
|
|
b.enterState(b.nextState())
|
|
}
|
|
|
|
// stopEngineAndWait deconfigures the local network data plane, and
|
|
// waits for it to deliver a status update before returning.
|
|
//
|
|
// TODO(danderson): this may be racy. We could unblock upon receiving
|
|
// a status update that predates the "I've shut down" update.
|
|
func (b *LocalBackend) stopEngineAndWait() {
|
|
b.logf("stopEngineAndWait...")
|
|
b.e.Reconfig(&wgcfg.Config{}, &router.Config{}, &dns.Config{})
|
|
b.requestEngineStatusAndWait()
|
|
b.logf("stopEngineAndWait: done.")
|
|
}
|
|
|
|
// Requests the wgengine status, and does not return until the status
|
|
// was delivered (to the usual callback).
|
|
func (b *LocalBackend) requestEngineStatusAndWait() {
|
|
b.logf("requestEngineStatusAndWait")
|
|
|
|
b.statusLock.Lock()
|
|
go b.e.RequestStatus()
|
|
b.logf("requestEngineStatusAndWait: waiting...")
|
|
b.statusChanged.Wait() // temporarily releases lock while waiting
|
|
b.logf("requestEngineStatusAndWait: got status update.")
|
|
b.statusLock.Unlock()
|
|
}
|
|
|
|
// Logout tells the controlclient that we want to log out, and
|
|
// transitions the local engine to the logged-out state without
|
|
// waiting for controlclient to be in that state.
|
|
//
|
|
// NOTE(apenwarr): No easy way to persist logged-out status.
|
|
// Maybe that's for the better; if someone logs out accidentally,
|
|
// rebooting will fix it.
|
|
func (b *LocalBackend) Logout() {
|
|
b.logout(context.Background(), false)
|
|
}
|
|
|
|
func (b *LocalBackend) LogoutSync(ctx context.Context) error {
|
|
return b.logout(ctx, true)
|
|
}
|
|
|
|
func (b *LocalBackend) logout(ctx context.Context, sync bool) error {
|
|
b.mu.Lock()
|
|
cc := b.cc
|
|
b.setNetMapLocked(nil)
|
|
b.mu.Unlock()
|
|
|
|
b.EditPrefs(&ipn.MaskedPrefs{
|
|
WantRunningSet: true,
|
|
Prefs: ipn.Prefs{WantRunning: true},
|
|
})
|
|
|
|
if cc == nil {
|
|
// Double Logout can happen via repeated IPN
|
|
// connections to ipnserver making it repeatedly
|
|
// transition from 1->0 total connections, which on
|
|
// Windows by default ("client mode") causes a Logout
|
|
// on the transition to zero.
|
|
// Previously this crashed when we asserted that c was non-nil
|
|
// here.
|
|
return errors.New("no controlclient")
|
|
}
|
|
|
|
var err error
|
|
if sync {
|
|
err = cc.Logout(ctx)
|
|
} else {
|
|
cc.StartLogout()
|
|
}
|
|
|
|
b.mu.Lock()
|
|
b.setNetMapLocked(nil)
|
|
b.mu.Unlock()
|
|
|
|
b.stateMachine()
|
|
return err
|
|
}
|
|
|
|
// assertClientLocked crashes if there is no controlclient in this backend.
|
|
func (b *LocalBackend) assertClientLocked() {
|
|
if b.cc == nil {
|
|
panic("LocalBackend.assertClient: b.cc == nil")
|
|
}
|
|
}
|
|
|
|
// setNetInfo sets b.hostinfo.NetInfo to ni, and passes ni along to the
|
|
// controlclient, if one exists.
|
|
func (b *LocalBackend) setNetInfo(ni *tailcfg.NetInfo) {
|
|
b.mu.Lock()
|
|
cc := b.cc
|
|
if b.hostinfo != nil {
|
|
b.hostinfo.NetInfo = ni.Clone()
|
|
}
|
|
b.mu.Unlock()
|
|
|
|
if cc == nil {
|
|
return
|
|
}
|
|
cc.SetNetInfo(ni)
|
|
}
|
|
|
|
func (b *LocalBackend) setNetMapLocked(nm *netmap.NetworkMap) {
|
|
var login string
|
|
if nm != nil {
|
|
login = nm.UserProfiles[nm.User].LoginName
|
|
if login == "" {
|
|
login = "<missing-profile>"
|
|
}
|
|
}
|
|
b.netMap = nm
|
|
if login != b.activeLogin {
|
|
b.logf("active login: %v", login)
|
|
b.activeLogin = login
|
|
}
|
|
|
|
if nm == nil {
|
|
b.nodeByAddr = nil
|
|
return
|
|
}
|
|
|
|
// Update the nodeByAddr index.
|
|
if b.nodeByAddr == nil {
|
|
b.nodeByAddr = map[netaddr.IP]*tailcfg.Node{}
|
|
}
|
|
// First pass, mark everything unwanted.
|
|
for k := range b.nodeByAddr {
|
|
b.nodeByAddr[k] = nil
|
|
}
|
|
addNode := func(n *tailcfg.Node) {
|
|
for _, ipp := range n.Addresses {
|
|
if ipp.IsSingleIP() {
|
|
b.nodeByAddr[ipp.IP] = n
|
|
}
|
|
}
|
|
}
|
|
if nm.SelfNode != nil {
|
|
addNode(nm.SelfNode)
|
|
}
|
|
for _, p := range nm.Peers {
|
|
addNode(p)
|
|
}
|
|
// Third pass, actually delete the unwanted items.
|
|
for k, v := range b.nodeByAddr {
|
|
if v == nil {
|
|
delete(b.nodeByAddr, k)
|
|
}
|
|
}
|
|
}
|
|
|
|
// TestOnlyPublicKeys returns the current machine and node public
|
|
// keys. Used in tests only to facilitate automated node authorization
|
|
// in the test harness.
|
|
func (b *LocalBackend) TestOnlyPublicKeys() (machineKey tailcfg.MachineKey, nodeKey tailcfg.NodeKey) {
|
|
b.mu.Lock()
|
|
prefs := b.prefs
|
|
machinePrivKey := b.machinePrivKey
|
|
b.mu.Unlock()
|
|
|
|
if prefs == nil || machinePrivKey.IsZero() {
|
|
return
|
|
}
|
|
|
|
mk := machinePrivKey.Public()
|
|
nk := prefs.Persist.PrivateNodeKey.Public()
|
|
return tailcfg.MachineKey(mk), tailcfg.NodeKey(nk)
|
|
}
|
|
|
|
func (b *LocalBackend) WaitingFiles() ([]WaitingFile, error) {
|
|
b.mu.Lock()
|
|
apiSrv := b.peerAPIServer
|
|
b.mu.Unlock()
|
|
if apiSrv == nil {
|
|
return nil, errors.New("peerapi disabled")
|
|
}
|
|
return apiSrv.WaitingFiles()
|
|
}
|
|
|
|
func (b *LocalBackend) DeleteFile(name string) error {
|
|
b.mu.Lock()
|
|
apiSrv := b.peerAPIServer
|
|
b.mu.Unlock()
|
|
if apiSrv == nil {
|
|
return errors.New("peerapi disabled")
|
|
}
|
|
return apiSrv.DeleteFile(name)
|
|
}
|
|
|
|
func (b *LocalBackend) OpenFile(name string) (rc io.ReadCloser, size int64, err error) {
|
|
b.mu.Lock()
|
|
apiSrv := b.peerAPIServer
|
|
b.mu.Unlock()
|
|
if apiSrv == nil {
|
|
return nil, 0, errors.New("peerapi disabled")
|
|
}
|
|
return apiSrv.OpenFile(name)
|
|
}
|
|
|
|
// FileTarget is a node to which files can be sent, and the PeerAPI
|
|
// URL base to do so via.
|
|
type FileTarget struct {
|
|
Node *tailcfg.Node
|
|
|
|
// PeerAPI is the http://ip:port URL base of the node's peer API,
|
|
// without any path (not even a single slash).
|
|
PeerAPIURL string
|
|
}
|
|
|
|
// FileTargets lists nodes that the current node can send files to.
|
|
func (b *LocalBackend) FileTargets() ([]*FileTarget, error) {
|
|
var ret []*FileTarget
|
|
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
nm := b.netMap
|
|
if b.state != ipn.Running || nm == nil {
|
|
return nil, errors.New("not connected")
|
|
}
|
|
for _, p := range nm.Peers {
|
|
if p.User != nm.User {
|
|
continue
|
|
}
|
|
peerAPI := peerAPIBase(b.netMap, p)
|
|
if peerAPI == "" {
|
|
continue
|
|
|
|
}
|
|
ret = append(ret, &FileTarget{
|
|
Node: p,
|
|
PeerAPIURL: peerAPI,
|
|
})
|
|
}
|
|
// TODO: sort a different way than the netmap already is?
|
|
return ret, nil
|
|
}
|
|
|
|
func (b *LocalBackend) registerIncomingFile(inf *incomingFile, active bool) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if b.incomingFiles == nil {
|
|
b.incomingFiles = make(map[*incomingFile]bool)
|
|
}
|
|
if active {
|
|
b.incomingFiles[inf] = true
|
|
} else {
|
|
delete(b.incomingFiles, inf)
|
|
}
|
|
}
|
|
|
|
// peerAPIBase returns the "http://ip:port" URL base to reach peer's peerAPI.
|
|
// It returns the empty string if the peer doesn't support the peerapi
|
|
// or there's no matching address family based on the netmap's own addresses.
|
|
func peerAPIBase(nm *netmap.NetworkMap, peer *tailcfg.Node) string {
|
|
if nm == nil || peer == nil {
|
|
return ""
|
|
}
|
|
var have4, have6 bool
|
|
for _, a := range nm.Addresses {
|
|
if !a.IsSingleIP() {
|
|
continue
|
|
}
|
|
switch {
|
|
case a.IP.Is4():
|
|
have4 = true
|
|
case a.IP.Is6():
|
|
have6 = true
|
|
}
|
|
}
|
|
var p4, p6 uint16
|
|
for _, s := range peer.Hostinfo.Services {
|
|
switch s.Proto {
|
|
case "peerapi4":
|
|
p4 = s.Port
|
|
case "peerapi6":
|
|
p6 = s.Port
|
|
}
|
|
}
|
|
var ipp netaddr.IPPort
|
|
switch {
|
|
case have4 && p4 != 0:
|
|
ipp = netaddr.IPPort{IP: nodeIP(peer, netaddr.IP.Is4), Port: p4}
|
|
case have6 && p6 != 0:
|
|
ipp = netaddr.IPPort{IP: nodeIP(peer, netaddr.IP.Is6), Port: p6}
|
|
}
|
|
if ipp.IP.IsZero() {
|
|
return ""
|
|
}
|
|
return fmt.Sprintf("http://%v", ipp)
|
|
}
|
|
|
|
func nodeIP(n *tailcfg.Node, pred func(netaddr.IP) bool) netaddr.IP {
|
|
for _, a := range n.Addresses {
|
|
if a.IsSingleIP() && pred(a.IP) {
|
|
return a.IP
|
|
}
|
|
}
|
|
return netaddr.IP{}
|
|
}
|
|
|
|
func isBSD(s string) bool {
|
|
return s == "dragonfly" || s == "freebsd" || s == "netbsd" || s == "openbsd"
|
|
}
|
|
|
|
func (b *LocalBackend) CheckIPForwarding() error {
|
|
if wgengine.IsNetstackRouter(b.e) {
|
|
return nil
|
|
}
|
|
if isBSD(runtime.GOOS) {
|
|
//lint:ignore ST1005 output to users as is
|
|
return fmt.Errorf("Subnet routing and exit nodes only work with additional manual configuration on %v, and is not currently officially supported.", runtime.GOOS)
|
|
}
|
|
|
|
var keys []string
|
|
|
|
if runtime.GOOS == "linux" {
|
|
keys = append(keys, "net.ipv4.ip_forward", "net.ipv6.conf.all.forwarding")
|
|
} else if isBSD(runtime.GOOS) {
|
|
keys = append(keys, "net.inet.ip.forwarding")
|
|
} else {
|
|
return nil
|
|
}
|
|
|
|
for _, key := range keys {
|
|
bs, err := exec.Command("sysctl", "-n", key).Output()
|
|
if err != nil {
|
|
//lint:ignore ST1005 output to users as is
|
|
return fmt.Errorf("couldn't check %s (%v).\nSubnet routes won't work without IP forwarding.", key, err)
|
|
}
|
|
on, err := strconv.ParseBool(string(bytes.TrimSpace(bs)))
|
|
if err != nil {
|
|
//lint:ignore ST1005 output to users as is
|
|
return fmt.Errorf("couldn't parse %s (%v).\nSubnet routes won't work without IP forwarding.", key, err)
|
|
}
|
|
if !on {
|
|
//lint:ignore ST1005 output to users as is
|
|
return fmt.Errorf("%s is disabled. Subnet routes won't work.", key)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// peerDialControlFunc is non-nil on platforms that require a way to
|
|
// bind to dial out to other peers.
|
|
var peerDialControlFunc func(*LocalBackend) func(network, address string, c syscall.RawConn) error
|
|
|
|
// PeerDialControlFunc returns a net.Dialer.Control func (possibly nil) to use to
|
|
// dial other Tailscale peers from the current environment.
|
|
func (b *LocalBackend) PeerDialControlFunc() func(network, address string, c syscall.RawConn) error {
|
|
if peerDialControlFunc != nil {
|
|
return peerDialControlFunc(b)
|
|
}
|
|
return nil
|
|
}
|