tailscale/ipn/ipnlocal/local.go

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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ipnlocal
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"net"
"net/http"
"os"
"os/exec"
"os/user"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"inet.af/netaddr"
"tailscale.com/client/tailscale/apitype"
"tailscale.com/control/controlclient"
"tailscale.com/health"
"tailscale.com/hostinfo"
"tailscale.com/ipn"
"tailscale.com/ipn/ipnstate"
"tailscale.com/ipn/policy"
"tailscale.com/net/dns"
"tailscale.com/net/interfaces"
"tailscale.com/net/tsaddr"
"tailscale.com/net/tsdial"
"tailscale.com/paths"
"tailscale.com/portlist"
"tailscale.com/tailcfg"
"tailscale.com/types/dnstype"
"tailscale.com/types/empty"
"tailscale.com/types/key"
"tailscale.com/types/logger"
"tailscale.com/types/netmap"
"tailscale.com/types/persist"
"tailscale.com/types/preftype"
"tailscale.com/util/deephash"
"tailscale.com/util/dnsname"
"tailscale.com/util/multierr"
"tailscale.com/util/osshare"
ipn/ipnserver: enable systemd-notify support Addresses #964 Still to be done: - Figure out the correct logging lines in util/systemd - Figure out if we need to slip the systemd.Status function anywhere else - Log util/systemd errors? (most of the errors are of the "you cannot do anything about this, but it might be a bad idea to crash the program if it errors" kind) Assistance in getting this over the finish line would help a lot. Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: rename the nonlinux file to appease the magic Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: fix package name Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: fix review feedback from @mdlayher Signed-off-by: Christine Dodrill <me@christine.website> cmd/tailscale{,d}: update depaware manifests Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: use sync.Once instead of func init Signed-off-by: Christine Dodrill <me@christine.website> control/controlclient: minor review feedback fixes Signed-off-by: Christine Dodrill <me@christine.website> {control,ipn,systemd}: fix review feedback Signed-off-by: Christine Dodrill <me@christine.website> review feedback fixes Signed-off-by: Christine Dodrill <me@christine.website> ipn: fix sprintf call Signed-off-by: Christine Dodrill <me@christine.website> ipn: make staticcheck less sad Signed-off-by: Christine Dodrill <me@christine.website> ipn: print IP address in connected status Signed-off-by: Christine Dodrill <me@christine.website> ipn: review feedback Signed-off-by: Christine Dodrill <me@christine.website> final fixups Signed-off-by: Christine Dodrill <me@christine.website>
2020-11-24 23:35:04 +00:00
"tailscale.com/util/systemd"
"tailscale.com/version"
"tailscale.com/version/distro"
"tailscale.com/wgengine"
"tailscale.com/wgengine/filter"
"tailscale.com/wgengine/magicsock"
"tailscale.com/wgengine/router"
"tailscale.com/wgengine/wgcfg"
"tailscale.com/wgengine/wgcfg/nmcfg"
)
var controlDebugFlags = getControlDebugFlags()
func getControlDebugFlags() []string {
if e := os.Getenv("TS_DEBUG_CONTROL_FLAGS"); e != "" {
return strings.Split(e, ",")
}
return nil
}
// LocalBackend is the glue between the major pieces of the Tailscale
// network software: the cloud control plane (via controlclient), the
// network data plane (via wgengine), and the user-facing UIs and CLIs
// (collectively called "frontends", via LocalBackend's implementation
// of the Backend interface).
//
// LocalBackend implements the overall state machine for the Tailscale
// application. Frontends, controlclient and wgengine can feed events
// into LocalBackend to advance the state machine, and advancing the
// state machine generates events back out to zero or more components.
type LocalBackend struct {
// Elements that are thread-safe or constant after construction.
ctx context.Context // canceled by Close
ctxCancel context.CancelFunc // cancels ctx
logf logger.Logf // general logging
keyLogf logger.Logf // for printing list of peers on change
statsLogf logger.Logf // for printing peers stats on change
e wgengine.Engine
store ipn.StateStore
dialer *tsdial.Dialer // non-nil
backendLogID string
unregisterLinkMon func()
unregisterHealthWatch func()
portpoll *portlist.Poller // may be nil
portpollOnce sync.Once // guards starting readPoller
gotPortPollRes chan struct{} // closed upon first readPoller result
serverURL string // tailcontrol URL
newDecompressor func() (controlclient.Decompressor, error)
varRoot string // or empty if SetVarRoot never called
filterHash deephash.Sum
filterAtomic atomic.Value // of *filter.Filter
// The mutex protects the following elements.
mu sync.Mutex
httpTestClient *http.Client // for controlclient. nil by default, used by tests.
ccGen clientGen // function for producing controlclient; lazily populated
notify func(ipn.Notify)
cc controlclient.Client
stateKey ipn.StateKey // computed in part from user-provided value
userID string // current controlling user ID (for Windows, primarily)
prefs *ipn.Prefs
inServerMode bool
machinePrivKey key.MachinePrivate
state ipn.State
capFileSharing bool // whether netMap contains the file sharing capability
// hostinfo is mutated in-place while mu is held.
hostinfo *tailcfg.Hostinfo
// netMap is not mutated in-place once set.
netMap *netmap.NetworkMap
nodeByAddr map[netaddr.IP]*tailcfg.Node
activeLogin string // last logged LoginName from netMap
engineStatus ipn.EngineStatus
endpoints []tailcfg.Endpoint
blocked bool
keyExpired bool
authURL string // cleared on Notify
authURLSticky string // not cleared on Notify
interact bool
prevIfState *interfaces.State
peerAPIServer *peerAPIServer // or nil
peerAPIListeners []*peerAPIListener
incomingFiles map[*incomingFile]bool
// directFileRoot, if non-empty, means to write received files
// directly to this directory, without staging them in an
// intermediate buffered directory for "pick-up" later. If
// empty, the files are received in a daemon-owned location
// and the localapi is used to enumerate, download, and delete
// them. This is used on macOS where the GUI lifetime is the
// same as the Network Extension lifetime and we can thus avoid
// double-copying files by writing them to the right location
// immediately.
// It's also used on Synology & TrueNAS, but in that case DoFinalRename
// is also set true, which moves the *.partial file to its final
// name on completion.
directFileRoot string
directFileDoFinalRename bool // false on macOS, true on Synology & TrueNAS
// statusLock must be held before calling statusChanged.Wait() or
// statusChanged.Broadcast().
statusLock sync.Mutex
statusChanged *sync.Cond
}
// clientGen is a func that creates a control plane client.
// It's the type used by LocalBackend.SetControlClientGetterForTesting.
type clientGen func(controlclient.Options) (controlclient.Client, error)
// NewLocalBackend returns a new LocalBackend that is ready to run,
// but is not actually running.
//
// If dialer is nil, a new one is made.
func NewLocalBackend(logf logger.Logf, logid string, store ipn.StateStore, dialer *tsdial.Dialer, e wgengine.Engine) (*LocalBackend, error) {
if e == nil {
panic("ipn.NewLocalBackend: engine must not be nil")
}
if dialer == nil {
dialer = new(tsdial.Dialer)
}
osshare.SetFileSharingEnabled(false, logf)
ctx, cancel := context.WithCancel(context.Background())
portpoll, err := portlist.NewPoller()
if err != nil {
logf("skipping portlist: %s", err)
}
b := &LocalBackend{
ctx: ctx,
ctxCancel: cancel,
logf: logf,
keyLogf: logger.LogOnChange(logf, 5*time.Minute, time.Now),
statsLogf: logger.LogOnChange(logf, 5*time.Minute, time.Now),
e: e,
store: store,
dialer: dialer,
backendLogID: logid,
state: ipn.NoState,
portpoll: portpoll,
gotPortPollRes: make(chan struct{}),
}
// Default filter blocks everything and logs nothing, until Start() is called.
b.setFilter(filter.NewAllowNone(logf, &netaddr.IPSet{}))
b.statusChanged = sync.NewCond(&b.statusLock)
b.e.SetStatusCallback(b.setWgengineStatus)
linkMon := e.GetLinkMonitor()
b.prevIfState = linkMon.InterfaceState()
// Call our linkChange code once with the current state, and
// then also whenever it changes:
b.linkChange(false, linkMon.InterfaceState())
b.unregisterLinkMon = linkMon.RegisterChangeCallback(b.linkChange)
b.unregisterHealthWatch = health.RegisterWatcher(b.onHealthChange)
wiredPeerAPIPort := false
if ig, ok := e.(wgengine.InternalsGetter); ok {
if tunWrap, _, ok := ig.GetInternals(); ok {
tunWrap.PeerAPIPort = b.getPeerAPIPortForTSMPPing
wiredPeerAPIPort = true
}
}
if !wiredPeerAPIPort {
b.logf("[unexpected] failed to wire up peer API port for engine %T", e)
}
return b, nil
}
// Dialer returns the backend's dialer.
func (b *LocalBackend) Dialer() *tsdial.Dialer {
return b.dialer
}
// SetDirectFileRoot sets the directory to download files to directly,
// without buffering them through an intermediate daemon-owned
// tailcfg.UserID-specific directory.
//
// This must be called before the LocalBackend starts being used.
func (b *LocalBackend) SetDirectFileRoot(dir string) {
b.mu.Lock()
defer b.mu.Unlock()
b.directFileRoot = dir
}
// SetDirectFileDoFinalRename sets whether the peerapi file server should rename
// a received "name.partial" file to "name" when the download is complete.
//
// This only applies when SetDirectFileRoot is non-empty.
// The default is false.
func (b *LocalBackend) SetDirectFileDoFinalRename(v bool) {
b.mu.Lock()
defer b.mu.Unlock()
b.directFileDoFinalRename = v
}
// b.mu must be held.
func (b *LocalBackend) maybePauseControlClientLocked() {
if b.cc == nil {
return
}
networkUp := b.prevIfState.AnyInterfaceUp()
b.cc.SetPaused((b.state == ipn.Stopped && b.netMap != nil) || !networkUp)
}
// linkChange is our link monitor callback, called whenever the network changes.
// major is whether ifst is different than earlier.
func (b *LocalBackend) linkChange(major bool, ifst *interfaces.State) {
b.mu.Lock()
defer b.mu.Unlock()
hadPAC := b.prevIfState.HasPAC()
b.prevIfState = ifst
b.maybePauseControlClientLocked()
// If the PAC-ness of the network changed, reconfig wireguard+route to
// add/remove subnets.
if hadPAC != ifst.HasPAC() {
b.logf("linkChange: in state %v; PAC changed from %v->%v", b.state, hadPAC, ifst.HasPAC())
switch b.state {
case ipn.NoState, ipn.Stopped:
// Do nothing.
default:
go b.authReconfig()
}
}
// If the local network configuration has changed, our filter may
// need updating to tweak default routes.
b.updateFilter(b.netMap, b.prefs)
if peerAPIListenAsync && b.netMap != nil && b.state == ipn.Running {
want := len(b.netMap.Addresses)
if len(b.peerAPIListeners) < want {
b.logf("linkChange: peerAPIListeners too low; trying again")
go b.initPeerAPIListener()
}
}
}
func (b *LocalBackend) onHealthChange(sys health.Subsystem, err error) {
if err == nil {
b.logf("health(%q): ok", sys)
} else {
b.logf("health(%q): error: %v", sys, err)
}
}
// Shutdown halts the backend and all its sub-components. The backend
// can no longer be used after Shutdown returns.
func (b *LocalBackend) Shutdown() {
b.mu.Lock()
cc := b.cc
b.mu.Unlock()
b.unregisterLinkMon()
b.unregisterHealthWatch()
if cc != nil {
cc.Shutdown()
}
b.ctxCancel()
b.e.Close()
b.e.Wait()
}
// Prefs returns a copy of b's current prefs, with any private keys removed.
func (b *LocalBackend) Prefs() *ipn.Prefs {
b.mu.Lock()
defer b.mu.Unlock()
p := b.prefs.Clone()
if p != nil && p.Persist != nil {
p.Persist.LegacyFrontendPrivateMachineKey = key.MachinePrivate{}
p.Persist.PrivateNodeKey = key.NodePrivate{}
p.Persist.OldPrivateNodeKey = key.NodePrivate{}
}
return p
}
// Status returns the latest status of the backend and its
// sub-components.
func (b *LocalBackend) Status() *ipnstate.Status {
sb := new(ipnstate.StatusBuilder)
b.UpdateStatus(sb)
return sb.Status()
}
// StatusWithoutPeers is like Status but omits any details
// of peers.
func (b *LocalBackend) StatusWithoutPeers() *ipnstate.Status {
sb := new(ipnstate.StatusBuilder)
b.updateStatus(sb, nil)
return sb.Status()
}
// UpdateStatus implements ipnstate.StatusUpdater.
func (b *LocalBackend) UpdateStatus(sb *ipnstate.StatusBuilder) {
b.e.UpdateStatus(sb)
b.updateStatus(sb, b.populatePeerStatusLocked)
}
// updateStatus populates sb with status.
//
// extraLocked, if non-nil, is called while b.mu is still held.
func (b *LocalBackend) updateStatus(sb *ipnstate.StatusBuilder, extraLocked func(*ipnstate.StatusBuilder)) {
b.mu.Lock()
defer b.mu.Unlock()
sb.MutateStatus(func(s *ipnstate.Status) {
s.Version = version.Long
s.BackendState = b.state.String()
s.AuthURL = b.authURLSticky
if err := health.OverallError(); err != nil {
switch e := err.(type) {
case multierr.Error:
for _, err := range e.Errors() {
s.Health = append(s.Health, err.Error())
}
default:
s.Health = append(s.Health, err.Error())
}
}
if b.netMap != nil {
s.MagicDNSSuffix = b.netMap.MagicDNSSuffix()
s.CertDomains = append([]string(nil), b.netMap.DNS.CertDomains...)
}
})
sb.MutateSelfStatus(func(ss *ipnstate.PeerStatus) {
ss.Online = health.GetInPollNetMap()
if b.netMap != nil {
ss.HostName = b.netMap.Hostinfo.Hostname
ss.DNSName = b.netMap.Name
ss.UserID = b.netMap.User
if sn := b.netMap.SelfNode; sn != nil {
ss.ID = sn.StableID
if c := sn.Capabilities; len(c) > 0 {
ss.Capabilities = append([]string(nil), c...)
}
}
} else {
ss.HostName, _ = os.Hostname()
}
for _, pln := range b.peerAPIListeners {
ss.PeerAPIURL = append(ss.PeerAPIURL, pln.urlStr)
}
})
// TODO: hostinfo, and its networkinfo
// TODO: EngineStatus copy (and deprecate it?)
if extraLocked != nil {
extraLocked(sb)
}
}
func (b *LocalBackend) populatePeerStatusLocked(sb *ipnstate.StatusBuilder) {
if b.netMap == nil {
return
}
for id, up := range b.netMap.UserProfiles {
sb.AddUser(id, up)
}
for _, p := range b.netMap.Peers {
var lastSeen time.Time
if p.LastSeen != nil {
lastSeen = *p.LastSeen
}
var tailscaleIPs = make([]netaddr.IP, 0, len(p.Addresses))
for _, addr := range p.Addresses {
if addr.IsSingleIP() && tsaddr.IsTailscaleIP(addr.IP()) {
tailscaleIPs = append(tailscaleIPs, addr.IP())
}
}
exitNodeOption := tsaddr.PrefixesContainsFunc(p.AllowedIPs, func(r netaddr.IPPrefix) bool {
return r.Bits() == 0
})
sb.AddPeer(p.Key, &ipnstate.PeerStatus{
InNetworkMap: true,
ID: p.StableID,
UserID: p.User,
TailscaleIPs: tailscaleIPs,
HostName: p.Hostinfo.Hostname,
DNSName: p.Name,
OS: p.Hostinfo.OS,
KeepAlive: p.KeepAlive,
Created: p.Created,
LastSeen: lastSeen,
Online: p.Online != nil && *p.Online,
ShareeNode: p.Hostinfo.ShareeNode,
ExitNode: p.StableID != "" && p.StableID == b.prefs.ExitNodeID,
ExitNodeOption: exitNodeOption,
})
}
}
// WhoIs reports the node and user who owns the node with the given IP:port.
// If the IP address is a Tailscale IP, the provided port may be 0.
// If ok == true, n and u are valid.
func (b *LocalBackend) WhoIs(ipp netaddr.IPPort) (n *tailcfg.Node, u tailcfg.UserProfile, ok bool) {
b.mu.Lock()
defer b.mu.Unlock()
n, ok = b.nodeByAddr[ipp.IP()]
if !ok {
var ip netaddr.IP
if ipp.Port() != 0 {
ip, ok = b.e.WhoIsIPPort(ipp)
}
if !ok {
return nil, u, false
}
n, ok = b.nodeByAddr[ip]
if !ok {
return nil, u, false
}
}
u, ok = b.netMap.UserProfiles[n.User]
if !ok {
return nil, u, false
}
return n, u, true
}
// SetDecompressor sets a decompression function, which must be a zstd
// reader.
//
// This exists because the iOS/Mac NetworkExtension is very resource
// constrained, and the zstd package is too heavy to fit in the
// constrained RSS limit.
func (b *LocalBackend) SetDecompressor(fn func() (controlclient.Decompressor, error)) {
b.newDecompressor = fn
}
// setClientStatus is the callback invoked by the control client whenever it posts a new status.
// Among other things, this is where we update the netmap, packet filters, DNS and DERP maps.
func (b *LocalBackend) setClientStatus(st controlclient.Status) {
// The following do not depend on any data for which we need to lock b.
if st.Err != nil {
// TODO(crawshaw): display in the UI.
if errors.Is(st.Err, io.EOF) {
b.logf("[v1] Received error: EOF")
return
}
b.logf("Received error: %v", st.Err)
var uerr controlclient.UserVisibleError
if errors.As(st.Err, &uerr) {
s := uerr.UserVisibleError()
b.send(ipn.Notify{ErrMessage: &s})
}
return
}
b.mu.Lock()
wasBlocked := b.blocked
keyExpiryExtended := false
if st.NetMap != nil {
wasExpired := b.keyExpired
isExpired := !st.NetMap.Expiry.IsZero() && st.NetMap.Expiry.Before(time.Now())
if wasExpired && !isExpired {
keyExpiryExtended = true
}
b.keyExpired = isExpired
}
b.mu.Unlock()
if keyExpiryExtended && wasBlocked {
// Key extended, unblock the engine
b.blockEngineUpdates(false)
}
if st.LoginFinished != nil && wasBlocked {
// Auth completed, unblock the engine
b.blockEngineUpdates(false)
b.authReconfig()
b.send(ipn.Notify{LoginFinished: &empty.Message{}})
}
prefsChanged := false
// Lock b once and do only the things that require locking.
b.mu.Lock()
if st.LogoutFinished != nil {
// Since we're logged out now, our netmap cache is invalid.
// Since st.NetMap==nil means "netmap is unchanged", there is
// no other way to represent this change.
b.setNetMapLocked(nil)
b.e.SetNetworkMap(new(netmap.NetworkMap))
}
prefs := b.prefs
stateKey := b.stateKey
netMap := b.netMap
interact := b.interact
ipn{,/ipnlocal}, cmd/tailscale/cli: don't check pref reverts on initial up The ipn.NewPrefs func returns a populated ipn.Prefs for historical reasons. It's not used or as important as it once was, but it hasn't yet been removed. Meanwhile, it contains some default values that are used on some platforms. Notably, for this bug (#1725), Windows/Mac use its Prefs.RouteAll true value (to accept subnets), but Linux users have always gotten a "false" value for that, because that's what cmd/tailscale's CLI default flag is _for all operating systems_. That meant that "tailscale up" was rightfully reporting that the user was changing an implicit setting: RouteAll was changing from true with false with the user explicitly saying so. An obvious fix might be to change ipn.NewPrefs to return Prefs.RouteAll == false on some platforms, but the logic is complicated by darwin: we want RouteAll true on windows, android, ios, and the GUI mac app, but not the CLI tailscaled-on-macOS mode. But even if we used build tags (e.g. the "redo" build tag) to determine what the default is, that then means we have duplicated and differing "defaults" between both the CLI up flags and ipn.NewPrefs. Furthering that complication didn't seem like a good idea. So, changing the NewPrefs defaults is too invasive at this stage of the release, as is removing the NewPrefs func entirely. Instead, tweak slightly the semantics of the ipn.Prefs.ControlURL field. This now defines that a ControlURL of the empty string means both "we're uninitialized" and also "just use the default". Then, once we have the "empty-string-means-unintialized" semantics, use that to suppress "tailscale up"'s recent implicit-setting-revert checking safety net, if we've never initialized Tailscale yet. And update/add tests. Fixes #1725 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-04-18 05:50:58 +00:00
if prefs.ControlURL == "" {
// Once we get a message from the control plane, set
// our ControlURL pref explicitly. This causes a
// future "tailscale up" to start checking for
// implicit setting reverts, which it doesn't do when
// ControlURL is blank.
prefs.ControlURL = prefs.ControlURLOrDefault()
prefsChanged = true
}
if st.Persist != nil {
if !b.prefs.Persist.Equals(st.Persist) {
prefsChanged = true
b.prefs.Persist = st.Persist.Clone()
}
}
if st.NetMap != nil {
if b.findExitNodeIDLocked(st.NetMap) {
prefsChanged = true
}
b.setNetMapLocked(st.NetMap)
}
if st.URL != "" {
b.authURL = st.URL
b.authURLSticky = st.URL
}
if wasBlocked && st.LoginFinished != nil {
// Interactive login finished successfully (URL visited).
// After an interactive login, the user always wants
// WantRunning.
if !b.prefs.WantRunning || b.prefs.LoggedOut {
prefsChanged = true
}
b.prefs.WantRunning = true
b.prefs.LoggedOut = false
}
// Prefs will be written out; this is not safe unless locked or cloned.
if prefsChanged {
prefs = b.prefs.Clone()
}
b.mu.Unlock()
// Now complete the lock-free parts of what we started while locked.
if prefsChanged {
if stateKey != "" {
if err := b.store.WriteState(stateKey, prefs.ToBytes()); err != nil {
b.logf("Failed to save new controlclient state: %v", err)
}
}
b.send(ipn.Notify{Prefs: prefs})
}
if st.NetMap != nil {
if netMap != nil {
diff := st.NetMap.ConciseDiffFrom(netMap)
if strings.TrimSpace(diff) == "" {
b.logf("[v1] netmap diff: (none)")
} else {
b.logf("netmap diff:\n%v", diff)
}
}
b.updateFilter(st.NetMap, prefs)
b.e.SetNetworkMap(st.NetMap)
b.e.SetDERPMap(st.NetMap.DERPMap)
b.send(ipn.Notify{NetMap: st.NetMap})
}
if st.URL != "" {
b.logf("Received auth URL: %.20v...", st.URL)
2020-10-27 20:57:10 +00:00
if interact {
b.popBrowserAuthNow()
}
}
b.stateMachine()
// This is currently (2020-07-28) necessary; conditionally disabling it is fragile!
// This is where netmap information gets propagated to router and magicsock.
b.authReconfig()
}
// findExitNodeIDLocked updates b.prefs to reference an exit node by ID,
// rather than by IP. It returns whether prefs was mutated.
func (b *LocalBackend) findExitNodeIDLocked(nm *netmap.NetworkMap) (prefsChanged bool) {
if nm == nil {
// No netmap, can't resolve anything.
return false
}
// 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)
b.broadcastStatusChanged()
return
}
if s == nil {
b.logf("[unexpected] non-error wgengine update with status=nil: %v", s)
b.broadcastStatusChanged()
return
}
b.mu.Lock()
es := b.parseWgStatusLocked(s)
cc := b.cc
b.engineStatus = es
needUpdateEndpoints := !endpointsEqual(s.LocalAddrs, b.endpoints)
if needUpdateEndpoints {
b.endpoints = append([]tailcfg.Endpoint{}, s.LocalAddrs...)
}
b.mu.Unlock()
if cc != nil {
if needUpdateEndpoints {
cc.UpdateEndpoints(0, s.LocalAddrs)
}
b.stateMachine()
}
b.broadcastStatusChanged()
b.send(ipn.Notify{Engine: &es})
}
func (b *LocalBackend) broadcastStatusChanged() {
// The sync.Cond docs say: "It is allowed but not required for the caller to hold c.L during the call."
// In this particular case, we must acquire b.statusLock. Otherwise we might broadcast before
// the waiter (in requestEngineStatusAndWait) starts to wait, in which case
// the waiter can get stuck indefinitely. See PR 2865.
b.statusLock.Lock()
b.statusChanged.Broadcast()
b.statusLock.Unlock()
}
func endpointsEqual(x, y []tailcfg.Endpoint) bool {
if len(x) != len(y) {
return false
}
for i := range x {
if x[i] != y[i] {
return false
}
}
return true
}
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
}
// SetControlClientGetterForTesting sets the func that creates a
// control plane client. It can be called at most once, before Start.
func (b *LocalBackend) SetControlClientGetterForTesting(newControlClient func(controlclient.Options) (controlclient.Client, error)) {
b.mu.Lock()
defer b.mu.Unlock()
if b.ccGen != nil {
panic("invalid use of SetControlClientGetterForTesting after Start")
}
b.ccGen = newControlClient
}
func (b *LocalBackend) getNewControlClientFunc() clientGen {
b.mu.Lock()
defer b.mu.Unlock()
if b.ccGen == nil {
// Initialize it rather than just returning the
// default to make any future call to
// SetControlClientGetterForTesting panic.
b.ccGen = func(opts controlclient.Options) (controlclient.Client, error) {
return controlclient.New(opts)
}
}
return b.ccGen
}
// startIsNoopLocked reports whether a Start call on this LocalBackend
// with the provided Start Options would be a useless no-op.
//
// TODO(apenwarr): we shouldn't need this.
// The state machine is now nearly clean enough where it can accept a new
// connection while in any state, not just Running, and on any platform.
// We'd want to add a few more tests to state_test.go to ensure this continues
// to work as expected.
//
// b.mu must be held.
func (b *LocalBackend) startIsNoopLocked(opts ipn.Options) bool {
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// Options has 5 fields; check all of them:
// * FrontendLogID
// * StateKey
// * Prefs
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// * UpdatePrefs
// * AuthKey
return b.state == ipn.Running &&
b.hostinfo != nil &&
b.hostinfo.FrontendLogID == opts.FrontendLogID &&
b.stateKey == opts.StateKey &&
opts.Prefs == nil &&
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opts.UpdatePrefs == nil &&
opts.AuthKey == ""
}
// 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")
}
b.mu.Lock()
// The iOS client sends a "Start" whenever its UI screen comes
// up, just because it wants a netmap. That should be fixed,
// but meanwhile we can make Start cheaper here for such a
// case and not restart the world (which takes a few seconds).
// Instead, just send a notify with the state that iOS needs.
if b.startIsNoopLocked(opts) {
b.logf("Start: already running; sending notify")
nm := b.netMap
state := b.state
b.mu.Unlock()
b.send(ipn.Notify{
State: &state,
NetMap: nm,
Prefs: b.prefs,
LoginFinished: new(empty.Message),
})
return nil
}
hostinfo := hostinfo.New()
hostinfo.BackendLogID = b.backendLogID
hostinfo.FrontendLogID = opts.FrontendLogID
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.mu.Unlock()
b.cc.Shutdown()
b.mu.Lock()
}
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)
}
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if opts.UpdatePrefs != nil {
newPrefs := opts.UpdatePrefs
newPrefs.Persist = b.prefs.Persist
b.prefs = newPrefs
if opts.StateKey != "" {
if err := b.store.WriteState(opts.StateKey, b.prefs.ToBytes()); err != nil {
b.logf("failed to save UpdatePrefs state: %v", err)
}
}
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}
wantRunning := b.prefs.WantRunning
if wantRunning {
if err := b.initMachineKeyLocked(); err != nil {
return fmt.Errorf("initMachineKeyLocked: %w", err)
}
}
loggedOut := b.prefs.LoggedOut
b.inServerMode = b.prefs.ForceDaemon
ipn{,/ipnlocal}, cmd/tailscale/cli: don't check pref reverts on initial up The ipn.NewPrefs func returns a populated ipn.Prefs for historical reasons. It's not used or as important as it once was, but it hasn't yet been removed. Meanwhile, it contains some default values that are used on some platforms. Notably, for this bug (#1725), Windows/Mac use its Prefs.RouteAll true value (to accept subnets), but Linux users have always gotten a "false" value for that, because that's what cmd/tailscale's CLI default flag is _for all operating systems_. That meant that "tailscale up" was rightfully reporting that the user was changing an implicit setting: RouteAll was changing from true with false with the user explicitly saying so. An obvious fix might be to change ipn.NewPrefs to return Prefs.RouteAll == false on some platforms, but the logic is complicated by darwin: we want RouteAll true on windows, android, ios, and the GUI mac app, but not the CLI tailscaled-on-macOS mode. But even if we used build tags (e.g. the "redo" build tag) to determine what the default is, that then means we have duplicated and differing "defaults" between both the CLI up flags and ipn.NewPrefs. Furthering that complication didn't seem like a good idea. So, changing the NewPrefs defaults is too invasive at this stage of the release, as is removing the NewPrefs func entirely. Instead, tweak slightly the semantics of the ipn.Prefs.ControlURL field. This now defines that a ControlURL of the empty string means both "we're uninitialized" and also "just use the default". Then, once we have the "empty-string-means-unintialized" semantics, use that to suppress "tailscale up"'s recent implicit-setting-revert checking safety net, if we've never initialized Tailscale yet. And update/add tests. Fixes #1725 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-04-18 05:50:58 +00:00
b.serverURL = b.prefs.ControlURLOrDefault()
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 key.DiscoPublic
if controlclient.Debug.Disco {
discoPublic = b.e.DiscoPublicKey()
}
var err error
if persistv == nil {
// let controlclient initialize it
persistv = &persist.Persist{}
}
isNetstack := wgengine.IsNetstackRouter(b.e)
debugFlags := controlDebugFlags
if isNetstack {
debugFlags = append([]string{"netstack"}, debugFlags...)
}
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// TODO(apenwarr): The only way to change the ServerURL is to
// re-run b.Start(), because this is the only place we create a
// new controlclient. SetPrefs() allows you to overwrite ServerURL,
// but it won't take effect until the next Start().
cc, err := b.getNewControlClientFunc()(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: debugFlags,
LinkMonitor: b.e.GetLinkMonitor(),
Pinger: b.e,
// Don't warn about broken Linux IP forwarding when
// netstack is being used.
SkipIPForwardingCheck: isNetstack,
})
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.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 !loggedOut && b.hasNodeKey() {
// Even if !WantRunning, we should verify our key, if there
// is one. If you want tailscaled to be completely idle,
// use logout instead.
cc.Login(nil, controlclient.LoginDefault)
}
b.stateMachine()
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.
localInterfaceRoutes, hostIPs, err := interfaceRoutes()
if err != nil {
b.logf("getting local interface routes: %v", err)
continue
}
s, err := shrinkDefaultRoute(r, localInterfaceRoutes, hostIPs)
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 := deephash.Update(&b.filterHash, haveNetmap, addrs, packetFilter, localNets.Ranges(), logNets.Ranges(), shieldsUp)
if !changed {
return
}
if !haveNetmap {
b.logf("netmap packet filter: (not ready yet)")
b.setFilter(filter.NewAllowNone(b.logf, logNets))
return
}
oldFilter := b.e.GetFilter()
if shieldsUp {
b.logf("netmap packet filter: (shields up)")
b.setFilter(filter.NewShieldsUpFilter(localNets, logNets, oldFilter, b.logf))
} else {
b.logf("netmap packet filter: %v filters", len(packetFilter))
b.setFilter(filter.New(packetFilter, localNets, logNets, oldFilter, b.logf))
}
}
func (b *LocalBackend) setFilter(f *filter.Filter) {
b.filterAtomic.Store(f)
b.e.SetFilter(f)
}
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(),
}
// internalAndExternalInterfaces splits interface routes into "internal"
// and "external" sets. Internal routes are those of virtual ethernet
// network interfaces used by guest VMs and containers, such as WSL and
// Docker.
//
// Given that "internal" routes don't leave the device, we choose to
// trust them more, allowing access to them when an Exit Node is enabled.
func internalAndExternalInterfaces() (internal, external []netaddr.IPPrefix, err error) {
il, err := interfaces.GetList()
if err != nil {
return nil, nil, err
}
return internalAndExternalInterfacesFrom(il, runtime.GOOS)
}
func internalAndExternalInterfacesFrom(il interfaces.List, goos string) (internal, external []netaddr.IPPrefix, err error) {
// We use an IPSetBuilder here to canonicalize the prefixes
// and to remove any duplicate entries.
var internalBuilder, externalBuilder netaddr.IPSetBuilder
if err := il.ForeachInterfaceAddress(func(iface interfaces.Interface, pfx netaddr.IPPrefix) {
if tsaddr.IsTailscaleIP(pfx.IP()) {
return
}
if pfx.IsSingleIP() {
return
}
if iface.IsLoopback() {
internalBuilder.AddPrefix(pfx)
return
}
if goos == "windows" {
// Windows Hyper-V prefixes all MAC addresses with 00:15:5d.
// https://docs.microsoft.com/en-us/troubleshoot/windows-server/virtualization/default-limit-256-dynamic-mac-addresses
//
// This includes WSL2 vEthernet.
// Importantly: by default WSL2 /etc/resolv.conf points to
// a stub resolver running on the host vEthernet IP.
// So enabling exit nodes with the default tailnet
// configuration breaks WSL2 DNS without this.
mac := iface.Interface.HardwareAddr
if len(mac) == 6 && mac[0] == 0x00 && mac[1] == 0x15 && mac[2] == 0x5d {
internalBuilder.AddPrefix(pfx)
return
}
}
externalBuilder.AddPrefix(pfx)
}); err != nil {
return nil, nil, err
}
iSet, err := internalBuilder.IPSet()
if err != nil {
return nil, nil, err
}
eSet, err := externalBuilder.IPSet()
if err != nil {
return nil, nil, err
}
return iSet.Prefixes(), eSet.Prefixes(), nil
}
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
}
ipSet, _ := b.IPSet()
return ipSet, hostIPs, nil
}
// shrinkDefaultRoute returns an IPSet representing the IPs in route,
// minus those in removeFromDefaultRoute and localInterfaceRoutes,
// plus the IPs in hostIPs.
func shrinkDefaultRoute(route netaddr.IPPrefix, localInterfaceRoutes *netaddr.IPSet, hostIPs []netaddr.IP) (*netaddr.IPSet, error) {
var b netaddr.IPSetBuilder
// Add the default route.
b.AddPrefix(route)
// Remove the local interface routes.
b.RemoveSet(localInterfaceRoutes)
// 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()
}
// 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.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
2020-10-27 20:57:10 +00:00
b.interact = false
b.authURL = "" // but NOT clearing authURLSticky
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() (key.MachinePrivate, error) {
var cache atomic.Value
return func() (key.MachinePrivate, error) {
if panicOnMachineKeyGeneration {
panic("machine key generated")
}
if v, ok := cache.Load().(key.MachinePrivate); ok {
return v, nil
}
b.mu.Lock()
defer b.mu.Unlock()
if v, ok := cache.Load().(key.MachinePrivate); ok {
return v, nil
}
if err := b.initMachineKeyLocked(); err != nil {
return key.MachinePrivate{}, 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 key.MachinePrivate
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() && !legacyMachineKey.Equal(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")
b.machinePrivKey = key.NewMachine()
}
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)
}
// On mobile platforms, ignore any old stored preferences for
// https://login.tailscale.com as the control server that
// would override the new default of controlplane.tailscale.com.
// This makes sure that mobile clients go through the new
// frontends where we're (2021-10-02) doing battery
// optimization work ahead of turning down the old backends.
// TODO(bradfitz): make this the default for all platforms
// later. But mobile is a relatively small chunk (compared to
// Linux, Windows, macOS) and moving mobile early for battery
// gains is nice.
switch runtime.GOOS {
case "android", "ios":
if b.prefs != nil && b.prefs.ControlURL != "" &&
b.prefs.ControlURL != ipn.DefaultControlURL &&
ipn.IsLoginServerSynonym(b.prefs.ControlURL) {
b.prefs.ControlURL = ""
}
}
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
}
// 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()
2020-10-27 20:57:10 +00:00
b.interact = true
url := b.authURL
cc := b.cc
b.mu.Unlock()
b.logf("StartLoginInteractive: url=%v", url != "")
if url != "" {
b.popBrowserAuthNow()
} else {
flags := controlclient.LoginInteractive
if runtime.GOOS == "js" {
// The js/wasm client has no state storage so for now
// treat all interactive logins as ephemeral.
// TODO(bradfitz): if we start using browser LocalStorage
// or something, then rethink this.
flags |= controlclient.LoginEphemeral
}
cc.Login(nil, flags)
}
}
// 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[key.NodePublic]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
}
b.logf("EditPrefs: %v", mp.Pretty())
b.setPrefsLockedOnEntry("EditPrefs", p1) // does a b.mu.Unlock
// Note: don't perform any actions for the new prefs here. Not
// every prefs change goes through EditPrefs. Put your actions
// in setPrefsLocksOnEntry instead.
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. newp ownership passes to this function.
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
// findExitNodeIDLocked returns whether it updated b.prefs, but
// everything in this function treats b.prefs as completely new
// anyway. No-op if no exit node resolution is needed.
b.findExitNodeIDLocked(netMap)
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()
applyPrefsToHostinfo(newHi, newp)
b.hostinfo = newHi
hostInfoChanged := !oldHi.Equal(newHi)
userID := b.userID
cc := b.cc
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: %q ([unexpected] corp#461, not %q)", newp.Persist.LoginName, login)
}
}
}
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.logf("transitioning to running; doing Login...")
cc.Login(nil, controlclient.LoginDefault)
}
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.PeerAPI4
if pln.ip.Is6() {
proto = tailcfg.PeerAPI6
}
ret = append(ret, tailcfg.Service{
Proto: proto,
Port: uint16(pln.port),
})
}
switch runtime.GOOS {
case "linux", "freebsd", "openbsd", "illumos", "darwin", "windows":
// These are the platforms currently supported by
// net/dns/resolver/tsdns.go:Resolver.HandleExitNodeDNSQuery.
ret = append(ret, tailcfg.Service{
Proto: tailcfg.PeerAPIDNS,
Port: 1, // version
})
}
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
}
func (b *LocalBackend) isEngineBlocked() bool {
b.mu.Lock()
defer b.mu.Unlock()
return b.blocked
}
// 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
prefs := 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 !prefs.WantRunning {
b.logf("authReconfig: skipping because !WantRunning.")
return
}
var flags netmap.WGConfigFlags
if prefs.RouteAll {
flags |= netmap.AllowSubnetRoutes
}
if prefs.AllowSingleHosts {
flags |= netmap.AllowSingleHosts
}
if hasPAC && disableSubnetsIfPAC {
if flags&netmap.AllowSubnetRoutes != 0 {
b.logf("authReconfig: have PAC; disabling subnet routes")
flags &^= netmap.AllowSubnetRoutes
}
}
// Keep the dialer updated about whether we're supposed to use
// an exit node's DNS server (so SOCKS5/HTTP outgoing dials
// can use it for name resolution)
if dohURL, ok := exitNodeCanProxyDNS(nm, prefs.ExitNodeID); ok {
b.dialer.SetExitDNSDoH(dohURL)
} else {
b.dialer.SetExitDNSDoH("")
}
cfg, err := nmcfg.WGCfg(nm, b.logf, flags, prefs.ExitNodeID)
if err != nil {
b.logf("wgcfg: %v", err)
return
}
rcfg := b.routerConfig(cfg, prefs)
dcfg := dnsConfigForNetmap(nm, prefs, b.logf, version.OS())
err = b.e.Reconfig(cfg, rcfg, dcfg, nm.Debug)
if err == wgengine.ErrNoChanges {
return
}
b.logf("[v1] authReconfig: ra=%v dns=%v 0x%02x: %v", prefs.RouteAll, prefs.CorpDNS, flags, err)
b.initPeerAPIListener()
}
// dnsConfigForNetmap returns a *dns.Config for the given netmap,
// prefs, and client OS version.
//
// The versionOS is a Tailscale-style version ("iOS", "macOS") and not
// a runtime.GOOS.
func dnsConfigForNetmap(nm *netmap.NetworkMap, prefs *ipn.Prefs, logf logger.Logf, versionOS string) *dns.Config {
dcfg := &dns.Config{
Routes: map[dnsname.FQDN][]dnstype.Resolver{},
Hosts: map[dnsname.FQDN][]netaddr.IP{},
}
// selfV6Only is whether we only have IPv6 addresses ourselves.
selfV6Only := tsaddr.PrefixesContainsFunc(nm.Addresses, tsaddr.PrefixIs6) &&
!tsaddr.PrefixesContainsFunc(nm.Addresses, tsaddr.PrefixIs4)
dcfg.OnlyIPv6 = selfV6Only
// Populate MagicDNS records. We do this unconditionally so that
// quad-100 can always respond to MagicDNS queries, even if the OS
// isn't configured to make MagicDNS resolution truly
// magic. Details in
// https://github.com/tailscale/tailscale/issues/1886.
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?
}
have4 := tsaddr.PrefixesContainsFunc(addrs, tsaddr.PrefixIs4)
var ips []netaddr.IP
for _, addr := range addrs {
if selfV6Only {
if addr.IP().Is6() {
ips = append(ips, addr.IP())
}
continue
}
// If this node has an IPv4 address, then
// remove peers' IPv6 addresses for now, as we
// don't guarantee that the peer node actually
// can speak IPv6 correctly.
//
// https://github.com/tailscale/tailscale/issues/1152
// tracks adding the right capability reporting to
// enable AAAA in MagicDNS.
if addr.IP().Is6() && have4 {
continue
}
ips = append(ips, addr.IP())
}
dcfg.Hosts[fqdn] = ips
}
set(nm.Name, nm.Addresses)
for _, peer := range nm.Peers {
set(peer.Name, peer.Addresses)
}
for _, rec := range nm.DNS.ExtraRecords {
switch rec.Type {
case "", "A", "AAAA":
// Treat these all the same for now: infer from the value
default:
// TODO: more
continue
}
ip, err := netaddr.ParseIP(rec.Value)
if err != nil {
// Ignore.
continue
}
fqdn, err := dnsname.ToFQDN(rec.Name)
if err != nil {
continue
}
dcfg.Hosts[fqdn] = append(dcfg.Hosts[fqdn], ip)
}
if !prefs.CorpDNS {
return dcfg
}
for _, dom := range nm.DNS.Domains {
fqdn, err := dnsname.ToFQDN(dom)
if err != nil {
logf("[unexpected] non-FQDN search domain %q", dom)
}
dcfg.SearchDomains = append(dcfg.SearchDomains, fqdn)
}
if nm.DNS.Proxied { // actually means "enable MagicDNS"
for _, dom := range magicDNSRootDomains(nm) {
dcfg.Routes[dom] = nil // resolve internally with dcfg.Hosts
}
}
addDefault := func(resolvers []dnstype.Resolver) {
for _, r := range resolvers {
dcfg.DefaultResolvers = append(dcfg.DefaultResolvers, normalizeResolver(r))
}
}
// If we're using an exit node and that exit node is new enough (1.19.x+)
// to run a DoH DNS proxy, then send all our DNS traffic through it.
if dohURL, ok := exitNodeCanProxyDNS(nm, prefs.ExitNodeID); ok {
addDefault([]dnstype.Resolver{{Addr: dohURL}})
return dcfg
}
addDefault(nm.DNS.Resolvers)
for suffix, resolvers := range nm.DNS.Routes {
fqdn, err := dnsname.ToFQDN(suffix)
if err != nil {
logf("[unexpected] non-FQDN route suffix %q", suffix)
}
// Create map entry even if len(resolvers) == 0; Issue 2706.
// This lets the control plane send ExtraRecords for which we
// can authoritatively answer "name not exists" for when the
// control plane also sends this explicit but empty route
// making it as something we handle.
//
// While we're already populating it, might as well size the
// slice appropriately.
dcfg.Routes[fqdn] = make([]dnstype.Resolver, 0, len(resolvers))
for _, r := range resolvers {
dcfg.Routes[fqdn] = append(dcfg.Routes[fqdn], normalizeResolver(r))
}
}
// Set FallbackResolvers as the default resolvers in the
// scenarios that can't handle a purely split-DNS config. See
// https://github.com/tailscale/tailscale/issues/1743 for
// details.
switch {
case len(dcfg.DefaultResolvers) != 0:
// Default resolvers already set.
case !prefs.ExitNodeID.IsZero():
// When using exit nodes, it's very likely the LAN
// resolvers will become unreachable. So, force use of the
// fallback resolvers until we implement DNS forwarding to
// exit nodes.
//
// This is especially important on Apple OSes, where
// adding the default route to the tunnel interface makes
// it "primary", and we MUST provide VPN-sourced DNS
// settings or we break all DNS resolution.
//
// https://github.com/tailscale/tailscale/issues/1713
addDefault(nm.DNS.FallbackResolvers)
case len(dcfg.Routes) == 0:
// No settings requiring split DNS, no problem.
}
return dcfg
}
func normalizeResolver(cfg dnstype.Resolver) dnstype.Resolver {
if ip, err := netaddr.ParseIP(cfg.Addr); err == nil {
// Add 53 here for bare IPs for consistency with previous data type.
return dnstype.Resolver{
Addr: netaddr.IPPortFrom(ip, 53).String(),
}
}
return cfg
}
// SetVarRoot sets the root directory of Tailscale's writable
// storage area . (e.g. "/var/lib/tailscale")
//
// It should only be called before the LocalBackend is used.
func (b *LocalBackend) SetVarRoot(dir string) {
b.varRoot = dir
}
// TailscaleVarRoot returns the root directory of Tailscale's writable
// storage area. (e.g. "/var/lib/tailscale")
//
// It returns an empty string if there's no configured or discovered
// location.
func (b *LocalBackend) TailscaleVarRoot() string {
if b.varRoot != "" {
return b.varRoot
}
switch runtime.GOOS {
case "ios", "android", "darwin":
dir, _ := paths.AppSharedDir.Load().(string)
return dir
}
return ""
}
func (b *LocalBackend) fileRootLocked(uid tailcfg.UserID) string {
if v := b.directFileRoot; v != "" {
return v
}
varRoot := b.TailscaleVarRoot()
if varRoot == "" {
b.logf("Taildrop 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("Taildrop disabled; error making directory: %v", err)
return ""
}
return dir
}
// closePeerAPIListenersLocked closes any existing peer API listeners
// and clears out the peer API server state.
//
// It does not kick off any Hostinfo update with new services.
//
// b.mu must be held.
func (b *LocalBackend) closePeerAPIListenersLocked() {
b.peerAPIServer = nil
for _, pln := range b.peerAPIListeners {
pln.Close()
}
b.peerAPIListeners = nil
}
// peerAPIListenAsync is whether the operating system requires that we
// retry listening on the peerAPI ip/port for whatever reason.
//
// On Windows, see Issue 1620.
// On Android, see Issue 1960.
const peerAPIListenAsync = runtime.GOOS == "windows" || runtime.GOOS == "android"
func (b *LocalBackend) initPeerAPIListener() {
b.mu.Lock()
defer b.mu.Unlock()
if b.netMap == nil {
// We're called from authReconfig which checks that
// netMap is non-nil, but if a concurrent Logout,
// ResetForClientDisconnect, or Start happens when its
// mutex was released, the netMap could be
// nil'ed out (Issue 1996). Bail out early here if so.
return
}
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.closePeerAPIListenersLocked()
selfNode := b.netMap.SelfNode
if len(b.netMap.Addresses) == 0 || selfNode == nil {
return
}
fileRoot := b.fileRootLocked(selfNode.User)
if fileRoot == "" {
b.logf("peerapi starting without Taildrop directory configured")
}
ps := &peerAPIServer{
b: b,
rootDir: fileRoot,
selfNode: selfNode,
directFileMode: b.directFileRoot != "",
directFileDoFinalRename: b.directFileDoFinalRename,
}
if re, ok := b.e.(wgengine.ResolvingEngine); ok {
if r, ok := re.GetResolver(); ok {
ps.resolver = r
}
}
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 {
if peerAPIListenAsync {
// Expected. But we fix it later in linkChange
// ("peerAPIListeners too low").
continue
}
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
}
ret := []dnsname.FQDN{
fqdn,
dnsname.FQDN("0.e.1.a.c.5.1.1.a.7.d.f.ip6.arpa."),
}
for i := 64; i <= 127; i++ {
fqdn, err = dnsname.ToFQDN(fmt.Sprintf("%d.100.in-addr.arpa.", i))
if err != nil {
// TODO: propagate error
continue
}
ret = append(ret, fqdn)
}
return ret
}
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),
}
if distro.Get() == distro.Synology {
// Issue 1995: we don't use iptables on Synology.
rs.NetfilterMode = preftype.NetfilterOff
}
// 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)
}
internalIPs, externalIPs, err := internalAndExternalInterfaces()
if err != nil {
b.logf("failed to discover interface ips: %v", err)
}
if runtime.GOOS == "linux" || runtime.GOOS == "darwin" || runtime.GOOS == "windows" {
rs.LocalRoutes = internalIPs // unconditionally allow access to guest VM networks
if prefs.ExitNodeAllowLANAccess {
rs.LocalRoutes = append(rs.LocalRoutes, externalIPs...)
if len(externalIPs) != 0 {
b.logf("allowing exit node access to internal IPs: %v", internalIPs)
}
} else {
// Explicitly add routes to the local network so that we do not
// leak any traffic.
rs.Routes = append(rs.Routes, externalIPs...)
}
}
}
if tsaddr.PrefixesContainsFunc(rs.LocalAddrs, tsaddr.PrefixIs4) {
rs.Routes = append(rs.Routes, netaddr.IPPrefixFrom(tsaddr.TailscaleServiceIP(), 32))
}
return rs
}
func unmapIPPrefix(ipp netaddr.IPPrefix) netaddr.IPPrefix {
return netaddr.IPPrefixFrom(ipp.IP().Unmap(), 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
}
hi.RoutableIPs = append(prefs.AdvertiseRoutes[:0:0], prefs.AdvertiseRoutes...)
hi.RequestTags = append(prefs.AdvertiseTags[:0:0], prefs.AdvertiseTags...)
2020-11-24 15:51:13 +00:00
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()
oldState := b.state
b.state = newState
prefs := b.prefs
netMap := b.netMap
ipn/ipnserver: enable systemd-notify support Addresses #964 Still to be done: - Figure out the correct logging lines in util/systemd - Figure out if we need to slip the systemd.Status function anywhere else - Log util/systemd errors? (most of the errors are of the "you cannot do anything about this, but it might be a bad idea to crash the program if it errors" kind) Assistance in getting this over the finish line would help a lot. Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: rename the nonlinux file to appease the magic Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: fix package name Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: fix review feedback from @mdlayher Signed-off-by: Christine Dodrill <me@christine.website> cmd/tailscale{,d}: update depaware manifests Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: use sync.Once instead of func init Signed-off-by: Christine Dodrill <me@christine.website> control/controlclient: minor review feedback fixes Signed-off-by: Christine Dodrill <me@christine.website> {control,ipn,systemd}: fix review feedback Signed-off-by: Christine Dodrill <me@christine.website> review feedback fixes Signed-off-by: Christine Dodrill <me@christine.website> ipn: fix sprintf call Signed-off-by: Christine Dodrill <me@christine.website> ipn: make staticcheck less sad Signed-off-by: Christine Dodrill <me@christine.website> ipn: print IP address in connected status Signed-off-by: Christine Dodrill <me@christine.website> ipn: review feedback Signed-off-by: Christine Dodrill <me@christine.website> final fixups Signed-off-by: Christine Dodrill <me@christine.website>
2020-11-24 23:35:04 +00:00
activeLogin := b.activeLogin
authURL := b.authURL
if newState == ipn.Running {
b.authURL = ""
b.authURLSticky = ""
} else if oldState == ipn.Running {
// Transitioning away from running.
b.closePeerAPIListenersLocked()
}
b.maybePauseControlClientLocked()
b.mu.Unlock()
if oldState == newState {
return
}
b.logf("Switching ipn state %v -> %v (WantRunning=%v, nm=%v)",
oldState, newState, prefs.WantRunning, netMap != nil)
health.SetIPNState(newState.String(), prefs.WantRunning)
b.send(ipn.Notify{State: &newState})
switch newState {
case ipn.NeedsLogin:
ipn/ipnserver: enable systemd-notify support Addresses #964 Still to be done: - Figure out the correct logging lines in util/systemd - Figure out if we need to slip the systemd.Status function anywhere else - Log util/systemd errors? (most of the errors are of the "you cannot do anything about this, but it might be a bad idea to crash the program if it errors" kind) Assistance in getting this over the finish line would help a lot. Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: rename the nonlinux file to appease the magic Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: fix package name Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: fix review feedback from @mdlayher Signed-off-by: Christine Dodrill <me@christine.website> cmd/tailscale{,d}: update depaware manifests Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: use sync.Once instead of func init Signed-off-by: Christine Dodrill <me@christine.website> control/controlclient: minor review feedback fixes Signed-off-by: Christine Dodrill <me@christine.website> {control,ipn,systemd}: fix review feedback Signed-off-by: Christine Dodrill <me@christine.website> review feedback fixes Signed-off-by: Christine Dodrill <me@christine.website> ipn: fix sprintf call Signed-off-by: Christine Dodrill <me@christine.website> ipn: make staticcheck less sad Signed-off-by: Christine Dodrill <me@christine.website> ipn: print IP address in connected status Signed-off-by: Christine Dodrill <me@christine.website> ipn: review feedback Signed-off-by: Christine Dodrill <me@christine.website> final fixups Signed-off-by: Christine Dodrill <me@christine.website>
2020-11-24 23:35:04 +00:00
systemd.Status("Needs login: %s", authURL)
b.blockEngineUpdates(true)
fallthrough
case ipn.Stopped:
err := b.e.Reconfig(&wgcfg.Config{}, &router.Config{}, &dns.Config{}, nil)
if err != nil {
b.logf("Reconfig(down): %v", err)
}
ipn/ipnserver: enable systemd-notify support Addresses #964 Still to be done: - Figure out the correct logging lines in util/systemd - Figure out if we need to slip the systemd.Status function anywhere else - Log util/systemd errors? (most of the errors are of the "you cannot do anything about this, but it might be a bad idea to crash the program if it errors" kind) Assistance in getting this over the finish line would help a lot. Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: rename the nonlinux file to appease the magic Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: fix package name Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: fix review feedback from @mdlayher Signed-off-by: Christine Dodrill <me@christine.website> cmd/tailscale{,d}: update depaware manifests Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: use sync.Once instead of func init Signed-off-by: Christine Dodrill <me@christine.website> control/controlclient: minor review feedback fixes Signed-off-by: Christine Dodrill <me@christine.website> {control,ipn,systemd}: fix review feedback Signed-off-by: Christine Dodrill <me@christine.website> review feedback fixes Signed-off-by: Christine Dodrill <me@christine.website> ipn: fix sprintf call Signed-off-by: Christine Dodrill <me@christine.website> ipn: make staticcheck less sad Signed-off-by: Christine Dodrill <me@christine.website> ipn: print IP address in connected status Signed-off-by: Christine Dodrill <me@christine.website> ipn: review feedback Signed-off-by: Christine Dodrill <me@christine.website> final fixups Signed-off-by: Christine Dodrill <me@christine.website>
2020-11-24 23:35:04 +00:00
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:
ipn/ipnserver: enable systemd-notify support Addresses #964 Still to be done: - Figure out the correct logging lines in util/systemd - Figure out if we need to slip the systemd.Status function anywhere else - Log util/systemd errors? (most of the errors are of the "you cannot do anything about this, but it might be a bad idea to crash the program if it errors" kind) Assistance in getting this over the finish line would help a lot. Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: rename the nonlinux file to appease the magic Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: fix package name Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: fix review feedback from @mdlayher Signed-off-by: Christine Dodrill <me@christine.website> cmd/tailscale{,d}: update depaware manifests Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: use sync.Once instead of func init Signed-off-by: Christine Dodrill <me@christine.website> control/controlclient: minor review feedback fixes Signed-off-by: Christine Dodrill <me@christine.website> {control,ipn,systemd}: fix review feedback Signed-off-by: Christine Dodrill <me@christine.website> review feedback fixes Signed-off-by: Christine Dodrill <me@christine.website> ipn: fix sprintf call Signed-off-by: Christine Dodrill <me@christine.website> ipn: make staticcheck less sad Signed-off-by: Christine Dodrill <me@christine.website> ipn: print IP address in connected status Signed-off-by: Christine Dodrill <me@christine.website> ipn: review feedback Signed-off-by: Christine Dodrill <me@christine.website> final fixups Signed-off-by: Christine Dodrill <me@christine.website>
2020-11-24 23:35:04 +00:00
var addrs []string
for _, addr := range netMap.Addresses {
addrs = append(addrs, addr.IP().String())
ipn/ipnserver: enable systemd-notify support Addresses #964 Still to be done: - Figure out the correct logging lines in util/systemd - Figure out if we need to slip the systemd.Status function anywhere else - Log util/systemd errors? (most of the errors are of the "you cannot do anything about this, but it might be a bad idea to crash the program if it errors" kind) Assistance in getting this over the finish line would help a lot. Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: rename the nonlinux file to appease the magic Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: fix package name Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: fix review feedback from @mdlayher Signed-off-by: Christine Dodrill <me@christine.website> cmd/tailscale{,d}: update depaware manifests Signed-off-by: Christine Dodrill <me@christine.website> util/systemd: use sync.Once instead of func init Signed-off-by: Christine Dodrill <me@christine.website> control/controlclient: minor review feedback fixes Signed-off-by: Christine Dodrill <me@christine.website> {control,ipn,systemd}: fix review feedback Signed-off-by: Christine Dodrill <me@christine.website> review feedback fixes Signed-off-by: Christine Dodrill <me@christine.website> ipn: fix sprintf call Signed-off-by: Christine Dodrill <me@christine.website> ipn: make staticcheck less sad Signed-off-by: Christine Dodrill <me@christine.website> ipn: print IP address in connected status Signed-off-by: Christine Dodrill <me@christine.website> ipn: review feedback Signed-off-by: Christine Dodrill <me@christine.website> final fixups Signed-off-by: Christine Dodrill <me@christine.website>
2020-11-24 23:35:04 +00:00
}
systemd.Status("Connected; %s; %s", activeLogin, strings.Join(addrs, " "))
default:
b.logf("[unexpected] unknown newState %#v", newState)
}
}
func (b *LocalBackend) hasNodeKey() bool {
// we can't use b.Prefs(), because it strips the keys, oops!
b.mu.Lock()
p := b.prefs
b.mu.Unlock()
return p.Persist != nil && !p.Persist.PrivateNodeKey.IsZero()
}
// 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
blocked = b.blocked
wantRunning = b.prefs.WantRunning
loggedOut = b.prefs.LoggedOut
st = b.engineStatus
keyExpired = b.keyExpired
)
b.mu.Unlock()
switch {
case !wantRunning && !loggedOut && !blocked && b.hasNodeKey():
return ipn.Stopped
case netMap == nil:
if cc.AuthCantContinue() || loggedOut {
// Auth was interrupted or waiting for URL visit,
// so it won't proceed without human help.
return ipn.NeedsLogin
}
switch state {
case ipn.Stopped:
// If we were already in the Stopped state, then
// we can assume auth is in good shape (or we would
// have been in NeedsLogin), so transition to Starting
// right away.
return ipn.Starting
case ipn.NoState:
// Our first time connecting to control, and we
// don't know if we'll NeedsLogin or not yet.
// UIs should print "Loading..." in this state.
return ipn.NoState
case ipn.Starting, ipn.Running, ipn.NeedsLogin:
return state
default:
b.logf("unexpected no-netmap state transition for %v", state)
return state
}
case !wantRunning:
return ipn.Stopped
case keyExpired:
// NetMap must be non-nil for us to get here.
// The node key expired, need to relogin.
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.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{}, nil)
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()
}
// ResetForClientDisconnect resets the backend for GUI clients running
// in interactive (non-headless) mode. This is currently used only by
// Windows. This causes all state to be cleared, lest an unrelated user
// connect to tailscaled next. But it does not trigger a logout; we
// don't want to the user to have to reauthenticate in the future
// when they restart the GUI.
func (b *LocalBackend) ResetForClientDisconnect() {
defer b.enterState(ipn.Stopped)
b.mu.Lock()
defer b.mu.Unlock()
b.logf("LocalBackend.ResetForClientDisconnect")
if b.cc != nil {
go b.cc.Shutdown()
b.cc = nil
}
b.stateKey = ""
b.userID = ""
b.setNetMapLocked(nil)
b.prefs = new(ipn.Prefs)
b.keyExpired = false
b.authURL = ""
b.authURLSticky = ""
b.activeLogin = ""
}
// 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.
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.mu.Unlock()
b.EditPrefs(&ipn.MaskedPrefs{
WantRunningSet: true,
LoggedOutSet: true,
Prefs: ipn.Prefs{WantRunning: false, LoggedOut: 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.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 hasCapability(nm *netmap.NetworkMap, cap string) bool {
if nm != nil && nm.SelfNode != nil {
for _, c := range nm.SelfNode.Capabilities {
if c == cap {
return true
}
}
}
return false
}
func (b *LocalBackend) setNetMapLocked(nm *netmap.NetworkMap) {
b.dialer.SetNetMap(nm)
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
}
b.maybePauseControlClientLocked()
if nm != nil {
health.SetControlHealth(nm.ControlHealth)
} else {
health.SetControlHealth(nil)
}
// Determine if file sharing is enabled
fs := hasCapability(nm, tailcfg.CapabilityFileSharing)
if fs != b.capFileSharing {
osshare.SetFileSharingEnabled(fs, b.logf)
}
b.capFileSharing = fs
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)
}
}
}
// OperatorUserID returns the current pref's OperatorUser's ID (in
// os/user.User.Uid string form), or the empty string if none.
func (b *LocalBackend) OperatorUserID() string {
b.mu.Lock()
if b.prefs == nil {
b.mu.Unlock()
return ""
}
opUserName := b.prefs.OperatorUser
b.mu.Unlock()
if opUserName == "" {
return ""
}
u, err := user.Lookup(opUserName)
if err != nil {
b.logf("error looking up operator %q uid: %v", opUserName, err)
return ""
}
return u.Uid
}
// 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 key.MachinePublic, nodeKey key.NodePublic) {
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 mk, nk
}
func (b *LocalBackend) WaitingFiles() ([]apitype.WaitingFile, error) {
b.mu.Lock()
apiSrv := b.peerAPIServer
b.mu.Unlock()
return apiSrv.WaitingFiles()
}
func (b *LocalBackend) DeleteFile(name string) error {
b.mu.Lock()
apiSrv := b.peerAPIServer
b.mu.Unlock()
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()
return apiSrv.OpenFile(name)
}
// hasCapFileSharing reports whether the current node has the file
// sharing capability enabled.
func (b *LocalBackend) hasCapFileSharing() bool {
b.mu.Lock()
defer b.mu.Unlock()
return b.capFileSharing
}
// FileTargets lists nodes that the current node can send files to.
func (b *LocalBackend) FileTargets() ([]*apitype.FileTarget, error) {
var ret []*apitype.FileTarget
b.mu.Lock()
defer b.mu.Unlock()
nm := b.netMap
if b.state != ipn.Running || nm == nil {
return nil, errors.New("not connected")
}
if !b.capFileSharing {
return nil, errors.New("file sharing not enabled by Tailscale admin")
}
for _, p := range nm.Peers {
if p.User != nm.User {
continue
}
peerAPI := peerAPIBase(b.netMap, p)
if peerAPI == "" {
continue
}
ret = append(ret, &apitype.FileTarget{
Node: p,
PeerAPIURL: peerAPI,
})
}
// TODO: sort a different way than the netmap already is?
return ret, nil
}
// SetDNS adds a DNS record for the given domain name & TXT record
// value.
//
// It's meant for use with dns-01 ACME (LetsEncrypt) challenges.
//
// This is the low-level interface. Other layers will provide more
// friendly options to get HTTPS certs.
func (b *LocalBackend) SetDNS(ctx context.Context, name, value string) error {
req := &tailcfg.SetDNSRequest{
Version: 1,
Type: "TXT",
Name: name,
Value: value,
}
b.mu.Lock()
cc := b.cc
if prefs := b.prefs; prefs != nil {
req.NodeKey = prefs.Persist.PrivateNodeKey.Public()
}
b.mu.Unlock()
if cc == nil {
return errors.New("not connected")
}
if req.NodeKey.IsZero() {
return errors.New("no nodekey")
}
if name == "" {
return errors.New("missing 'name'")
}
if value == "" {
return errors.New("missing 'value'")
}
return cc.SetDNS(ctx, req)
}
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 tailcfg.PeerAPI4:
p4 = s.Port
case tailcfg.PeerAPI6:
p6 = s.Port
}
}
var ipp netaddr.IPPort
switch {
case have4 && p4 != 0:
ipp = netaddr.IPPortFrom(nodeIP(peer, netaddr.IP.Is4), p4)
case have6 && p6 != 0:
ipp = netaddr.IPPortFrom(nodeIP(peer, netaddr.IP.Is6), 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
}
switch {
case isBSD(runtime.GOOS):
return fmt.Errorf("Subnet routing and exit nodes only work with additional manual configuration on %v, and is not currently officially supported.", runtime.GOOS)
case runtime.GOOS == "linux":
return checkIPForwardingLinux()
default:
// TODO: subnet routing and exit nodes probably don't work
// correctly on non-linux, non-netstack OSes either. Warn
// instead of being silent?
return nil
}
}
// checkIPForwardingLinux checks if IP forwarding is enabled correctly
// for subnet routing and exit node functionality. Returns an error
// describing configuration issues if the configuration is not
// definitely good.
func checkIPForwardingLinux() error {
const kbLink = "\nSee https://tailscale.com/kb/1104/enable-ip-forwarding/"
disabled, err := disabledSysctls("net.ipv4.ip_forward", "net.ipv6.conf.all.forwarding")
if err != nil {
return fmt.Errorf("Couldn't check system's IP forwarding configuration, subnet routing/exit nodes may not work: %w%s", err, kbLink)
}
if len(disabled) == 0 {
// IP forwarding is enabled systemwide, all is well.
return nil
}
// IP forwarding isn't enabled globally, but it might be enabled
// on a per-interface basis. Check if it's on for all interfaces,
// and warn appropriately if it's not.
ifaces, err := interfaces.GetList()
if err != nil {
return fmt.Errorf("Couldn't enumerate network interfaces, subnet routing/exit nodes may not work: %w%s", err, kbLink)
}
var (
warnings []string
anyEnabled bool
)
for _, iface := range ifaces {
if iface.Name == "lo" {
continue
}
disabled, err = disabledSysctls(fmt.Sprintf("net.ipv4.conf.%s.forwarding", iface.Name), fmt.Sprintf("net.ipv6.conf.%s.forwarding", iface.Name))
if err != nil {
return fmt.Errorf("Couldn't check system's IP forwarding configuration, subnet routing/exit nodes may not work: %w%s", err, kbLink)
}
if len(disabled) > 0 {
warnings = append(warnings, fmt.Sprintf("Traffic received on %s won't be forwarded (%s disabled)", iface.Name, strings.Join(disabled, ", ")))
} else {
anyEnabled = true
}
}
if !anyEnabled {
// IP forwarding is compeltely disabled, just say that rather
// than enumerate all the interfaces on the system.
return fmt.Errorf("IP forwarding is disabled, subnet routing/exit nodes will not work.%s", kbLink)
}
if len(warnings) > 0 {
// If partially enabled, enumerate the bits that won't work.
return fmt.Errorf("%s\nSubnet routes and exit nodes may not work correctly.%s", strings.Join(warnings, "\n"), kbLink)
}
return nil
}
// disabledSysctls checks if the given sysctl keys are off, according
// to strconv.ParseBool. Returns a list of keys that are disabled, or
// err if something went wrong which prevented the lookups from
// completing.
func disabledSysctls(sysctls ...string) (disabled []string, err error) {
for _, k := range sysctls {
// TODO: on linux, we can get at these values via /proc/sys,
// rather than fork subcommands that may not be installed.
bs, err := exec.Command("sysctl", "-n", k).Output()
if err != nil {
return nil, fmt.Errorf("couldn't check %s (%v)", k, err)
}
on, err := strconv.ParseBool(string(bytes.TrimSpace(bs)))
if err != nil {
return nil, fmt.Errorf("couldn't parse %s (%v)", k, err)
}
if !on {
disabled = append(disabled, k)
}
}
return disabled, nil
}
// DERPMap returns the current DERPMap in use, or nil if not connected.
func (b *LocalBackend) DERPMap() *tailcfg.DERPMap {
b.mu.Lock()
defer b.mu.Unlock()
if b.netMap == nil {
return nil
}
return b.netMap.DERPMap
}
// OfferingExitNode reports whether b is currently offering exit node
// access.
func (b *LocalBackend) OfferingExitNode() bool {
b.mu.Lock()
defer b.mu.Unlock()
if b.prefs == nil {
return false
}
var def4, def6 bool
for _, r := range b.prefs.AdvertiseRoutes {
if r.Bits() != 0 {
continue
}
if r.IP().Is4() {
def4 = true
} else if r.IP().Is6() {
def6 = true
}
}
return def4 && def6
}
// allowExitNodeDNSProxyToServeName reports whether the Exit Node DNS
// proxy is allowed to serve responses for the provided DNS name.
func (b *LocalBackend) allowExitNodeDNSProxyToServeName(name string) bool {
b.mu.Lock()
defer b.mu.Unlock()
nm := b.netMap
if nm == nil {
return false
}
name = strings.ToLower(name)
for _, bad := range nm.DNS.ExitNodeFilteredSet {
if bad == "" {
// Invalid, ignore.
continue
}
if bad[0] == '.' {
// Entries beginning with a dot are suffix matches.
if dnsname.HasSuffix(name, bad) {
return false
}
continue
}
// Otherwise entries are exact matches. They're
// guaranteed to be lowercase already.
if name == bad {
return false
}
}
return true
}
// exitNodeCanProxyDNS reports the DoH base URL ("http://foo/dns-query") without query parameters
// to exitNodeID's DoH service, if available.
//
// If exitNodeID is the zero valid, it returns "", false.
func exitNodeCanProxyDNS(nm *netmap.NetworkMap, exitNodeID tailcfg.StableNodeID) (dohURL string, ok bool) {
if exitNodeID.IsZero() {
return "", false
}
for _, p := range nm.Peers {
if p.StableID != exitNodeID {
continue
}
for _, s := range p.Hostinfo.Services {
if s.Proto == tailcfg.PeerAPIDNS && s.Port >= 1 {
return peerAPIBase(nm, p) + "/dns-query", true
}
}
}
return "", false
}
func (b *LocalBackend) DebugRebind() error {
mc, err := b.magicConn()
if err != nil {
return err
}
mc.Rebind()
return nil
}
func (b *LocalBackend) DebugReSTUN() error {
mc, err := b.magicConn()
if err != nil {
return err
}
mc.ReSTUN("explicit-debug")
return nil
}
func (b *LocalBackend) magicConn() (*magicsock.Conn, error) {
ig, ok := b.e.(wgengine.InternalsGetter)
if !ok {
return nil, errors.New("engine isn't InternalsGetter")
}
_, mc, ok := ig.GetInternals()
if !ok {
return nil, errors.New("failed to get internals")
}
return mc, nil
}