diff --git a/ipn/ipnlocal/local.go b/ipn/ipnlocal/local.go index 0e6c5da05..6992f6378 100644 --- a/ipn/ipnlocal/local.go +++ b/ipn/ipnlocal/local.go @@ -162,6 +162,7 @@ type LocalBackend struct { tka *tkaState state ipn.State capFileSharing bool // whether netMap contains the file sharing capability + capTailnetLock bool // whether netMap contains the tailnet lock capability // hostinfo is mutated in-place while mu is held. hostinfo *tailcfg.Hostinfo // netMap is not mutated in-place once set. @@ -869,6 +870,8 @@ func (b *LocalBackend) setClientStatus(st controlclient.Status) { } // Prefs will be written out; this is not safe unless locked or cloned. if st.NetMap != nil { + b.capTailnetLock = hasCapability(st.NetMap, tailcfg.CapabilityTailnetLockAlpha) + b.mu.Unlock() // respect locking rules for tkaSyncIfNeeded if err := b.tkaSyncIfNeeded(st.NetMap, prefs.View()); err != nil { b.logf("[v1] TKA sync error: %v", err) diff --git a/ipn/ipnlocal/network-lock.go b/ipn/ipnlocal/network-lock.go index f4c4b8d19..1b1375d6f 100644 --- a/ipn/ipnlocal/network-lock.go +++ b/ipn/ipnlocal/network-lock.go @@ -46,13 +46,21 @@ type tkaState struct { filtered []ipnstate.TKAFilteredPeer } +// permitTKAInitLocked returns true if tailnet lock initialization may +// occur. +// b.mu must be held. +func (b *LocalBackend) permitTKAInitLocked() bool { + return envknob.UseWIPCode() || b.capTailnetLock +} + // tkaFilterNetmapLocked checks the signatures on each node key, dropping // nodes from the netmap whose signature does not verify. // // b.mu must be held. func (b *LocalBackend) tkaFilterNetmapLocked(nm *netmap.NetworkMap) { - if !envknob.UseWIPCode() { - return // Feature-flag till network-lock is in Alpha. + // TODO(tom): Remove this guard for 1.35 and later. + if b.tka == nil && !b.permitTKAInitLocked() { + return } if b.tka == nil { return // TKA not enabled. @@ -61,7 +69,7 @@ func (b *LocalBackend) tkaFilterNetmapLocked(nm *netmap.NetworkMap) { var toDelete map[int]bool // peer index => true for i, p := range nm.Peers { if p.UnsignedPeerAPIOnly { - // Not subject to TKA. + // Not subject to tailnet lock. continue } if len(p.KeySignature) == 0 { @@ -123,18 +131,18 @@ func (b *LocalBackend) tkaFilterNetmapLocked(nm *netmap.NetworkMap) { // tkaSyncIfNeeded immediately takes b.takeSyncLock which is held throughout, // and may take b.mu as required. func (b *LocalBackend) tkaSyncIfNeeded(nm *netmap.NetworkMap, prefs ipn.PrefsView) error { - if !envknob.UseWIPCode() { - // If the feature flag is not enabled, pretend we don't exist. - return nil - } - - b.logf("tkaSyncIfNeeded: enabled=%v, head=%v", nm.TKAEnabled, nm.TKAHead) - b.tkaSyncLock.Lock() // take tkaSyncLock to make this function an exclusive section. defer b.tkaSyncLock.Unlock() b.mu.Lock() // take mu to protect access to synchronized fields. defer b.mu.Unlock() + // TODO(tom): Remove this guard for 1.35 and later. + if b.tka == nil && !b.permitTKAInitLocked() { + return nil + } + + b.logf("tkaSyncIfNeeded: enabled=%v, head=%v", nm.TKAEnabled, nm.TKAHead) + ourNodeKey := prefs.Persist().PublicNodeKey() isEnabled := b.tka != nil @@ -352,10 +360,6 @@ func (b *LocalBackend) tkaBootstrapFromGenesisLocked(g tkatype.MarshaledAUM, per // CanSupportNetworkLock returns nil if tailscaled is able to operate // a local tailnet key authority (and hence enforce network lock). func (b *LocalBackend) CanSupportNetworkLock() error { - if !envknob.UseWIPCode() { - return errors.New("this feature is not yet complete, a later release may support this functionality") - } - if b.tka != nil { // If the TKA is being used, it is supported. return nil @@ -453,6 +457,13 @@ func (b *LocalBackend) NetworkLockInit(keys []tka.Key, disablementValues [][]byt var ourNodeKey key.NodePublic var nlPriv key.NLPrivate b.mu.Lock() + + // TODO(tom): Remove this guard for 1.35 and later. + if !b.permitTKAInitLocked() { + b.mu.Unlock() + return errors.New("this feature is not yet complete, a later release may support this functionality") + } + if p := b.pm.CurrentPrefs(); p.Valid() && p.Persist().Valid() && !p.Persist().PrivateNodeKey().IsZero() { ourNodeKey = p.Persist().PublicNodeKey() nlPriv = p.Persist().NetworkLockKey() @@ -631,9 +642,6 @@ func (b *LocalBackend) NetworkLockModify(addKeys, removeKeys []tka.Key) (err err return errors.New("no node-key: is tailscale logged in?") } - if err := b.CanSupportNetworkLock(); err != nil { - return err - } var nlPriv key.NLPrivate if p := b.pm.CurrentPrefs(); p.Valid() && p.Persist().Valid() { nlPriv = p.Persist().NetworkLockKey() @@ -690,10 +698,6 @@ func (b *LocalBackend) NetworkLockModify(addKeys, removeKeys []tka.Key) (err err // NetworkLockDisable disables network-lock using the provided disablement secret. func (b *LocalBackend) NetworkLockDisable(secret []byte) error { - if err := b.CanSupportNetworkLock(); err != nil { - return err - } - var ( ourNodeKey key.NodePublic head tka.AUMHash diff --git a/tailcfg/tailcfg.go b/tailcfg/tailcfg.go index 38caff99f..290151fd1 100644 --- a/tailcfg/tailcfg.go +++ b/tailcfg/tailcfg.go @@ -87,7 +87,8 @@ type CapabilityVersion int // - 48: 2022-11-02: Node.UnsignedPeerAPIOnly // - 49: 2022-11-03: Client understands EarlyNoise // - 50: 2022-11-14: Client understands CapabilityIngress -const CurrentCapabilityVersion CapabilityVersion = 50 +// - 51: 2022-11-30: Client understands CapabilityTailnetLockAlpha +const CurrentCapabilityVersion CapabilityVersion = 51 type StableID string @@ -1707,6 +1708,12 @@ const ( CapabilityDataPlaneAuditLogs = "https://tailscale.com/cap/data-plane-audit-logs" // feature enabled CapabilityDebug = "https://tailscale.com/cap/debug" // exposes debug endpoints over the PeerAPI + // CapabilityTailnetLockAlpha indicates the node is in the tailnet lock alpha, + // and initialization of tailnet lock may proceed. + // + // TODO(tom): Remove this for 1.35 and later. + CapabilityTailnetLockAlpha = "https://tailscale.com/cap/tailnet-lock-alpha" + // Inter-node capabilities as specified in the MapResponse.PacketFilter[].CapGrants. // CapabilityFileSharingTarget grants the current node the ability to send