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tailscale/ipn/ipnlocal/profiles.go

466 lines
13 KiB
Go

// Copyright (c) 2022 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 (
"encoding/json"
"errors"
"fmt"
"math/rand"
"runtime"
"time"
"golang.org/x/exp/slices"
"tailscale.com/ipn"
"tailscale.com/types/logger"
"tailscale.com/util/clientmetric"
"tailscale.com/util/strs"
"tailscale.com/version"
)
// profileManager is a wrapper around a StateStore that manages
// multiple profiles and the current profile.
type profileManager struct {
store ipn.StateStore
logf logger.Logf
currentUserID string // only used on Windows
knownProfiles map[ipn.ProfileID]*ipn.LoginProfile
currentProfile *ipn.LoginProfile
prefs ipn.PrefsView
// isNewProfile is a sentinel value that indicates that the
// current profile is new and has not been saved to disk yet.
// It is reset to false after a call to SetPrefs with a filled
// in LoginName.
isNewProfile bool
}
// CurrentUser returns the current user ID. It is only non-empty on
// Windows where we have a multi-user system.
func (pm *profileManager) CurrentUser() string {
return pm.currentUserID
}
// SetCurrentUser sets the current user ID. The uid is only non-empty
// on Windows where we have a multi-user system.
func (pm *profileManager) SetCurrentUser(uid string) error {
if pm.currentUserID == uid {
return nil
}
cpk := ipn.CurrentProfileKey(uid)
if b, err := pm.store.ReadState(cpk); err == nil {
pk := ipn.StateKey(string(b))
prefs, err := pm.loadSavedPrefs(pk)
if err != nil {
return err
}
pm.currentProfile = pm.findProfileByKey(pk)
pm.prefs = prefs
pm.isNewProfile = false
} else if err == ipn.ErrStateNotExist {
pm.NewProfile()
} else {
return err
}
pm.currentUserID = uid
return nil
}
func (pm *profileManager) findProfileByName(name string) *ipn.LoginProfile {
for _, p := range pm.knownProfiles {
if p.Name == name {
return p
}
}
return nil
}
func (pm *profileManager) findProfileByKey(key ipn.StateKey) *ipn.LoginProfile {
for _, p := range pm.knownProfiles {
if p.Key == key {
return p
}
}
return nil
}
func (pm *profileManager) setUnattendedModeAsConfigured() error {
if pm.currentUserID == "" {
return nil
}
if pm.prefs.ForceDaemon() {
return pm.store.WriteState(ipn.ServerModeStartKey, []byte(pm.currentProfile.Key))
} else {
return pm.store.WriteState(ipn.ServerModeStartKey, nil)
}
}
// Reset unloads the current profile, if any.
func (pm *profileManager) Reset() {
pm.currentUserID = ""
pm.NewProfile()
}
func init() {
rand.Seed(time.Now().UnixNano())
}
// SetPrefs sets the current profile's prefs to the provided value.
// It also saves the prefs to the StateStore. It stores a copy of the
// provided prefs, which may be accessed via CurrentPrefs.
func (pm *profileManager) SetPrefs(prefsIn ipn.PrefsView) error {
prefs := prefsIn.AsStruct().View()
ps := prefs.Persist()
if ps == nil || ps.LoginName == "" {
return pm.setPrefsLocked(prefs)
}
up := ps.UserProfile
if up.LoginName == "" {
up.LoginName = ps.LoginName
}
if up.DisplayName == "" {
up.DisplayName = up.LoginName
}
cp := pm.currentProfile
if pm.isNewProfile {
pm.isNewProfile = false
cp.ID, cp.Key = newUnusedID(pm.knownProfiles)
cp.Name = ps.LoginName
cp.UserProfile = ps.UserProfile
cp.LocalUserID = pm.currentUserID
} else {
cp.UserProfile = ps.UserProfile
}
pm.knownProfiles[cp.ID] = cp
if err := pm.writeKnownProfiles(); err != nil {
return err
}
if err := pm.setAsUserSelectedProfileLocked(); err != nil {
return err
}
if err := pm.setPrefsLocked(prefs); err != nil {
return err
}
return nil
}
func newUnusedID(knownProfiles map[ipn.ProfileID]*ipn.LoginProfile) (ipn.ProfileID, ipn.StateKey) {
var idb [2]byte
for {
rand.Read(idb[:])
id := ipn.ProfileID(fmt.Sprintf("%x", idb))
if _, ok := knownProfiles[id]; ok {
continue
}
return id, ipn.StateKey("profile-" + id)
}
}
// setPrefsLocked sets the current profile's prefs to the provided value.
// It also saves the prefs to the StateStore, if the current profile
// is not new.
func (pm *profileManager) setPrefsLocked(clonedPrefs ipn.PrefsView) error {
pm.prefs = clonedPrefs
if pm.isNewProfile {
return nil
}
if err := pm.writePrefsToStore(pm.currentProfile.Key, pm.prefs); err != nil {
return err
}
return pm.setUnattendedModeAsConfigured()
}
func (pm *profileManager) writePrefsToStore(key ipn.StateKey, prefs ipn.PrefsView) error {
if key == "" {
return nil
}
if err := pm.store.WriteState(key, prefs.ToBytes()); err != nil {
pm.logf("WriteState(%q): %v", key, err)
return err
}
return nil
}
// Profiles returns the list of known profiles.
func (pm *profileManager) Profiles() []ipn.LoginProfile {
var profiles []ipn.LoginProfile
for _, p := range pm.knownProfiles {
if p.LocalUserID == pm.currentUserID {
profiles = append(profiles, *p)
}
}
slices.SortFunc(profiles, func(a, b ipn.LoginProfile) bool {
return a.Name < b.Name
})
return profiles
}
// SwitchProfile switches to the profile with the given id.
// If the profile is not known, it returns an errProfileNotFound.
func (pm *profileManager) SwitchProfile(id ipn.ProfileID) error {
metricSwitchProfile.Add(1)
kp, ok := pm.knownProfiles[id]
if !ok {
return errProfileNotFound
}
if pm.currentProfile != nil && kp.ID == pm.currentProfile.ID && pm.prefs.Valid() {
return nil
}
if kp.LocalUserID != pm.currentUserID {
return fmt.Errorf("profile %q is not owned by current user", id)
}
prefs, err := pm.loadSavedPrefs(kp.Key)
if err != nil {
return err
}
pm.prefs = prefs
pm.currentProfile = kp
pm.isNewProfile = false
return pm.setAsUserSelectedProfileLocked()
}
func (pm *profileManager) setAsUserSelectedProfileLocked() error {
k := ipn.CurrentProfileKey(pm.currentUserID)
return pm.store.WriteState(k, []byte(pm.currentProfile.Key))
}
func (pm *profileManager) loadSavedPrefs(key ipn.StateKey) (ipn.PrefsView, error) {
bs, err := pm.store.ReadState(key)
if err != nil {
if err == ipn.ErrStateNotExist {
return emptyPrefs, nil
}
return ipn.PrefsView{}, err
}
savedPrefs, err := ipn.PrefsFromBytes(bs)
if err != nil {
return ipn.PrefsView{}, fmt.Errorf("PrefsFromBytes: %v", err)
}
pm.logf("using backend prefs for %q: %v", key, savedPrefs.Pretty())
// Ignore any old stored preferences for https://login.tailscale.com
// as the control server that would override the new default of
// controlplane.tailscale.com.
if savedPrefs.ControlURL != "" &&
savedPrefs.ControlURL != ipn.DefaultControlURL &&
ipn.IsLoginServerSynonym(savedPrefs.ControlURL) {
savedPrefs.ControlURL = ""
}
return savedPrefs.View(), nil
}
// CurrentProfile returns the current LoginProfile.
// The value may be zero if the profile is not persisted.
func (pm *profileManager) CurrentProfile() ipn.LoginProfile {
return *pm.currentProfile
}
// errProfileNotFound is returned by methods that accept a ProfileID.
var errProfileNotFound = errors.New("profile not found")
// DeleteProfile removes the profile with the given id. It returns
// errProfileNotFound if the profile does not exist.
// If the profile is the current profile, it is the equivalent of
// calling NewProfile() followed by DeleteProfile(id). This is
// useful for deleting the last profile. In other cases, it is
// recommended to call SwitchProfile() first.
func (pm *profileManager) DeleteProfile(id ipn.ProfileID) error {
metricDeleteProfile.Add(1)
if id == "" && pm.isNewProfile {
// Deleting the in-memory only new profile, just create a new one.
pm.NewProfile()
return nil
}
kp, ok := pm.knownProfiles[id]
if !ok {
return errProfileNotFound
}
if kp.ID == pm.currentProfile.ID {
pm.NewProfile()
}
if err := pm.store.WriteState(kp.Key, nil); err != nil {
return err
}
delete(pm.knownProfiles, id)
return pm.writeKnownProfiles()
}
func (pm *profileManager) writeKnownProfiles() error {
b, err := json.Marshal(pm.knownProfiles)
if err != nil {
return err
}
return pm.store.WriteState(ipn.KnownProfilesStateKey, b)
}
// NewProfile creates and switches to a new unnamed profile. The new profile is
// not persisted until SetPrefs is called with a logged-in user.
func (pm *profileManager) NewProfile() {
metricNewProfile.Add(1)
pm.prefs = emptyPrefs
pm.isNewProfile = true
pm.currentProfile = &ipn.LoginProfile{}
}
// emptyPrefs is the default prefs for a new profile.
var emptyPrefs = func() ipn.PrefsView {
prefs := ipn.NewPrefs()
prefs.WantRunning = false
return prefs.View()
}()
// Store returns the StateStore used by the ProfileManager.
func (pm *profileManager) Store() ipn.StateStore {
return pm.store
}
// CurrentPrefs returns a read-only view of the current prefs.
func (pm *profileManager) CurrentPrefs() ipn.PrefsView {
return pm.prefs
}
// ReadStartupPrefsForTest reads the startup prefs from disk. It is only used for testing.
func ReadStartupPrefsForTest(logf logger.Logf, store ipn.StateStore) (ipn.PrefsView, error) {
pm, err := newProfileManager(store, logf, "")
if err != nil {
return ipn.PrefsView{}, err
}
return pm.CurrentPrefs(), nil
}
// newProfileManager creates a new ProfileManager using the provided StateStore.
// It also loads the list of known profiles from the StateStore.
// If a state key is provided, it will be used to load the current profile.
func newProfileManager(store ipn.StateStore, logf logger.Logf, stateKey ipn.StateKey) (*profileManager, error) {
return newProfileManagerWithGOOS(store, logf, stateKey, runtime.GOOS)
}
func readAutoStartKey(store ipn.StateStore, goos string) (ipn.StateKey, error) {
startKey := ipn.CurrentProfileStateKey
if goos == "windows" {
// When tailscaled runs on Windows it is not typically run unattended.
// So we can't use the profile mechanism to load the profile at startup.
startKey = ipn.ServerModeStartKey
}
autoStartKey, err := store.ReadState(startKey)
if err != nil && err != ipn.ErrStateNotExist {
return "", fmt.Errorf("calling ReadState on state store: %w", err)
}
return ipn.StateKey(autoStartKey), nil
}
func readKnownProfiles(store ipn.StateStore) (map[ipn.ProfileID]*ipn.LoginProfile, error) {
var knownProfiles map[ipn.ProfileID]*ipn.LoginProfile
prfB, err := store.ReadState(ipn.KnownProfilesStateKey)
switch err {
case nil:
if err := json.Unmarshal(prfB, &knownProfiles); err != nil {
return nil, fmt.Errorf("unmarshaling known profiles: %w", err)
}
case ipn.ErrStateNotExist:
knownProfiles = make(map[ipn.ProfileID]*ipn.LoginProfile)
default:
return nil, fmt.Errorf("calling ReadState on state store: %w", err)
}
return knownProfiles, nil
}
func newProfileManagerWithGOOS(store ipn.StateStore, logf logger.Logf, stateKey ipn.StateKey, goos string) (*profileManager, error) {
if stateKey == "" {
var err error
stateKey, err = readAutoStartKey(store, goos)
if err != nil {
return nil, err
}
}
knownProfiles, err := readKnownProfiles(store)
if err != nil {
return nil, err
}
pm := &profileManager{
store: store,
knownProfiles: knownProfiles,
logf: logf,
}
if stateKey != "" {
for _, v := range knownProfiles {
if v.Key == stateKey {
pm.currentProfile = v
}
}
if pm.currentProfile == nil {
if suf, ok := strs.CutPrefix(string(stateKey), "user-"); ok {
pm.currentUserID = suf
}
pm.NewProfile()
} else {
pm.currentUserID = pm.currentProfile.LocalUserID
}
prefs, err := pm.loadSavedPrefs(stateKey)
if err != nil {
return nil, err
}
if err := pm.setPrefsLocked(prefs); err != nil {
return nil, err
}
} else if len(knownProfiles) == 0 && goos != "windows" {
// No known profiles, try a migration.
if err := pm.migrateFromLegacyPrefs(); err != nil {
return nil, err
}
} else {
pm.NewProfile()
}
return pm, nil
}
func (pm *profileManager) migrateFromLegacyPrefs() error {
metricMigration.Add(1)
pm.NewProfile()
k := ipn.LegacyGlobalDaemonStateKey
switch {
case runtime.GOOS == "ios":
k = "ipn-go-bridge"
case version.IsSandboxedMacOS():
k = "ipn-go-bridge"
case runtime.GOOS == "android":
k = "ipn-android"
}
prefs, err := pm.loadSavedPrefs(k)
if err != nil {
metricMigrationError.Add(1)
return fmt.Errorf("calling ReadState on state store: %w", err)
}
pm.logf("migrating %q profile to new format", k)
if err := pm.SetPrefs(prefs); err != nil {
metricMigrationError.Add(1)
return fmt.Errorf("migrating _daemon profile: %w", err)
}
// Do not delete the old state key, as we may be downgraded to an
// older version that still relies on it.
metricMigrationSuccess.Add(1)
return nil
}
var (
metricNewProfile = clientmetric.NewCounter("profiles_new")
metricSwitchProfile = clientmetric.NewCounter("profiles_switch")
metricDeleteProfile = clientmetric.NewCounter("profiles_delete")
metricMigration = clientmetric.NewCounter("profiles_migration")
metricMigrationError = clientmetric.NewCounter("profiles_migration_error")
metricMigrationSuccess = clientmetric.NewCounter("profiles_migration_success")
)