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@ -306,8 +306,10 @@ func (b *LocalBackend) setClientStatus(st controlclient.Status) {
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prefsChanged = true
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}
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if st.NetMap != nil {
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if b.keepOneExitNodeLocked(st.NetMap) {
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prefsChanged = true
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}
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b.setNetMapLocked(st.NetMap)
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}
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if st.URL != "" {
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b.authURL = st.URL
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@ -365,6 +367,57 @@ func (b *LocalBackend) setClientStatus(st controlclient.Status) {
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b.authReconfig()
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}
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// keepOneExitNodeLocked edits nm to retain only the default
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// routes provided by the exit node specified in b.prefs. It returns
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// whether prefs was mutated as part of the process, due to an exit
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// node IP being converted into a node ID.
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func (b *LocalBackend) keepOneExitNodeLocked(nm *controlclient.NetworkMap) (prefsChanged bool) {
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if b.prefs.ExitNodeID == "" && b.prefs.ExitNodeIP.IsZero() {
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return false
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}
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// If we have a desired IP on file, try to find the corresponding
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// node.
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if !b.prefs.ExitNodeIP.IsZero() {
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// IP takes precedence over ID, so if both are set, clear ID.
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if b.prefs.ExitNodeID != "" {
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b.prefs.ExitNodeID = ""
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prefsChanged = true
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}
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peerLoop:
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for _, peer := range nm.Peers {
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for _, addr := range peer.Addresses {
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if !addr.IsSingleIP() || addr.IP != b.prefs.ExitNodeIP {
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continue
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}
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// Found the node being referenced, upgrade prefs to
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// reference it directly for next time.
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b.prefs.ExitNodeID = peer.StableID
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b.prefs.ExitNodeIP = netaddr.IP{}
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prefsChanged = true
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break peerLoop
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}
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}
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}
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// At this point, we have a node ID if the requested node is in
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// the netmap. If not, the ID will be empty, and we'll strip out
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// all default routes.
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for _, peer := range nm.Peers {
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out := peer.AllowedIPs[:0]
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for _, allowedIP := range peer.AllowedIPs {
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if allowedIP.Bits == 0 && peer.StableID != b.prefs.ExitNodeID {
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continue
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}
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out = append(out, allowedIP)
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}
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peer.AllowedIPs = out
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}
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return prefsChanged
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}
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// setWgengineStatus is the callback by the wireguard engine whenever it posts a new status.
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// This updates the endpoints both in the backend and in the control client.
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func (b *LocalBackend) setWgengineStatus(s *wgengine.Status, err error) {
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@ -1203,8 +1256,6 @@ func (b *LocalBackend) authReconfig() {
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var flags controlclient.WGConfigFlags
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if uc.RouteAll {
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flags |= controlclient.AllowDefaultRoute
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// TODO(apenwarr): Make subnet routes a different pref?
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flags |= controlclient.AllowSubnetRoutes
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}
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if uc.AllowSingleHosts {
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@ -1256,6 +1307,11 @@ func magicDNSRootDomains(nm *controlclient.NetworkMap) []string {
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return nil
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}
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var (
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ipv4Default = netaddr.MustParseIPPrefix("0.0.0.0/0")
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ipv6Default = netaddr.MustParseIPPrefix("::/0")
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)
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// routerConfig produces a router.Config from a wireguard config and IPN prefs.
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func routerConfig(cfg *wgcfg.Config, prefs *ipn.Prefs) *router.Config {
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rs := &router.Config{
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@ -1269,6 +1325,32 @@ func routerConfig(cfg *wgcfg.Config, prefs *ipn.Prefs) *router.Config {
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rs.Routes = append(rs.Routes, unmapIPPrefixes(peer.AllowedIPs)...)
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}
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// Sanity check: we expect the control server to program both a v4
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// and a v6 default route, if default routing is on. Fill in
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// blackhole routes appropriately if we're missing some. This is
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// likely to break some functionality, but if the user expressed a
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// preference for routing remotely, we want to avoid leaking
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// traffic at the expense of functionality.
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if prefs.ExitNodeID != "" || !prefs.ExitNodeIP.IsZero() {
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var default4, default6 bool
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for _, route := range rs.Routes {
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if route == ipv4Default {
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default4 = true
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} else if route == ipv6Default {
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default6 = true
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}
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if default4 && default6 {
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break
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}
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}
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if !default4 {
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rs.Routes = append(rs.Routes, ipv4Default)
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}
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if !default6 {
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rs.Routes = append(rs.Routes, ipv6Default)
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}
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}
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rs.Routes = append(rs.Routes, netaddr.IPPrefix{
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IP: tsaddr.TailscaleServiceIP(),
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Bits: 32,
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David Anderson
4 years ago
committed by