mirror of
https://github.com/cwinfo/yggdrasil-go.git
synced 2024-11-12 19:50:27 +00:00
Rename crypto-key config options, improve control flow
This commit is contained in:
Neil Alexander
parent
c04816b4bd
commit
2a629880fd
@ -80,6 +80,24 @@ func readConfig(useconf *bool, useconffile *string, normaliseconf *bool) *config
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if listen, ok := dat["Listen"].(string); ok {
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dat["Listen"] = []string{listen}
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}
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if tunnelrouting, ok := dat["TunnelRouting"].(map[string]interface{}); ok {
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if c, ok := tunnelrouting["IPv4Sources"]; ok {
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delete(tunnelrouting, "IPv4Sources")
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tunnelrouting["IPv4LocalSubnets"] = c
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}
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if c, ok := tunnelrouting["IPv6Sources"]; ok {
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delete(tunnelrouting, "IPv6Sources")
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tunnelrouting["IPv6LocalSubnets"] = c
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}
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if c, ok := tunnelrouting["IPv4Destinations"]; ok {
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delete(tunnelrouting, "IPv4Destinations")
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tunnelrouting["IPv4RemoteSubnets"] = c
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}
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if c, ok := tunnelrouting["IPv6Destinations"]; ok {
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delete(tunnelrouting, "IPv6Destinations")
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tunnelrouting["IPv6RemoteSubnets"] = c
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}
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}
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// Sanitise the config
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confJson, err := json.Marshal(dat)
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if err != nil {
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@ -74,11 +74,11 @@ type SessionFirewall struct {
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// TunnelRouting contains the crypto-key routing tables for tunneling
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type TunnelRouting struct {
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Enable bool `comment:"Enable or disable tunnel routing."`
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IPv6Destinations map[string]string `comment:"IPv6 CIDR subnets, mapped to the EncryptionPublicKey to which they\nshould be routed, e.g. { \"aaaa:bbbb:cccc::/e\": \"boxpubkey\", ... }"`
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IPv6Sources []string `comment:"Optional IPv6 source subnets which are allowed to be tunnelled in\naddition to this node's Yggdrasil address/subnet. If not\nspecified, only traffic originating from this node's Yggdrasil\naddress or subnet will be tunnelled."`
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IPv4Destinations map[string]string `comment:"IPv4 CIDR subnets, mapped to the EncryptionPublicKey to which they\nshould be routed, e.g. { \"a.b.c.d/e\": \"boxpubkey\", ... }"`
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IPv4Sources []string `comment:"IPv4 source subnets which are allowed to be tunnelled. Unlike for\nIPv6, this option is required for bridging IPv4 traffic. Only\ntraffic with a source matching these subnets will be tunnelled."`
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Enable bool `comment:"Enable or disable tunnel routing."`
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IPv6RemoteSubnets map[string]string `comment:"IPv6 subnets belonging to remote nodes, mapped to the node's public\nkey, e.g. { \"aaaa:bbbb:cccc::/e\": \"boxpubkey\", ... }"`
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IPv6LocalSubnets []string `comment:"IPv6 subnets belonging to this node's end of the tunnels. Only traffic\nfrom these ranges (or the Yggdrasil node's IPv6 address/subnet)\nwill be tunnelled."`
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IPv4RemoteSubnets map[string]string `comment:"IPv4 subnets belonging to remote nodes, mapped to the node's public\nkey, e.g. { \"a.b.c.d/e\": \"boxpubkey\", ... }"`
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IPv4LocalSubnets []string `comment:"IPv4 subnets belonging to this node's end of the tunnels. Only traffic\nfrom these ranges will be tunnelled."`
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}
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// SwitchOptions contains tuning options for the switch
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@ -66,15 +66,15 @@ func (t *TunAdapter) SetupAdminHandlers(a *admin.AdminSocket) {
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t.ckr.setEnabled(enabled)
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return admin.Info{"enabled": enabled}, nil
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})
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a.AddHandler("addSourceSubnet", []string{"subnet"}, func(in admin.Info) (admin.Info, error) {
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if err := t.ckr.addSourceSubnet(in["subnet"].(string)); err == nil {
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a.AddHandler("addLocalSubnet", []string{"subnet"}, func(in admin.Info) (admin.Info, error) {
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if err := t.ckr.addLocalSubnet(in["subnet"].(string)); err == nil {
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return admin.Info{"added": []string{in["subnet"].(string)}}, nil
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} else {
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return admin.Info{"not_added": []string{in["subnet"].(string)}}, errors.New("Failed to add source subnet")
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}
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})
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a.AddHandler("addRoute", []string{"subnet", "box_pub_key"}, func(in admin.Info) (admin.Info, error) {
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if err := t.ckr.addRoute(in["subnet"].(string), in["box_pub_key"].(string)); err == nil {
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a.AddHandler("addRemoteSubnet", []string{"subnet", "box_pub_key"}, func(in admin.Info) (admin.Info, error) {
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if err := t.ckr.addRemoteSubnet(in["subnet"].(string), in["box_pub_key"].(string)); err == nil {
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return admin.Info{"added": []string{fmt.Sprintf("%s via %s", in["subnet"].(string), in["box_pub_key"].(string))}}, nil
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} else {
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return admin.Info{"not_added": []string{fmt.Sprintf("%s via %s", in["subnet"].(string), in["box_pub_key"].(string))}}, errors.New("Failed to add route")
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@ -87,8 +87,8 @@ func (t *TunAdapter) SetupAdminHandlers(a *admin.AdminSocket) {
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subnets = append(subnets, subnet.String())
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}
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}
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getSourceSubnets(t.ckr.ipv4sources)
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getSourceSubnets(t.ckr.ipv6sources)
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getSourceSubnets(t.ckr.ipv4locals)
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getSourceSubnets(t.ckr.ipv6locals)
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return admin.Info{"source_subnets": subnets}, nil
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})
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a.AddHandler("getRoutes", []string{}, func(in admin.Info) (admin.Info, error) {
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@ -98,19 +98,19 @@ func (t *TunAdapter) SetupAdminHandlers(a *admin.AdminSocket) {
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routes[ckr.subnet.String()] = hex.EncodeToString(ckr.destination[:])
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}
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}
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getRoutes(t.ckr.ipv4routes)
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getRoutes(t.ckr.ipv6routes)
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getRoutes(t.ckr.ipv4remotes)
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getRoutes(t.ckr.ipv6remotes)
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return admin.Info{"routes": routes}, nil
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})
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a.AddHandler("removeSourceSubnet", []string{"subnet"}, func(in admin.Info) (admin.Info, error) {
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if err := t.ckr.removeSourceSubnet(in["subnet"].(string)); err == nil {
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a.AddHandler("removeLocalSubnet", []string{"subnet"}, func(in admin.Info) (admin.Info, error) {
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if err := t.ckr.removeLocalSubnet(in["subnet"].(string)); err == nil {
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return admin.Info{"removed": []string{in["subnet"].(string)}}, nil
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} else {
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return admin.Info{"not_removed": []string{in["subnet"].(string)}}, errors.New("Failed to remove source subnet")
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}
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})
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a.AddHandler("removeRoute", []string{"subnet", "box_pub_key"}, func(in admin.Info) (admin.Info, error) {
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if err := t.ckr.removeRoute(in["subnet"].(string), in["box_pub_key"].(string)); err == nil {
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a.AddHandler("removeRemoteSubnet", []string{"subnet", "box_pub_key"}, func(in admin.Info) (admin.Info, error) {
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if err := t.ckr.removeRemoteSubnet(in["subnet"].(string), in["box_pub_key"].(string)); err == nil {
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return admin.Info{"removed": []string{fmt.Sprintf("%s via %s", in["subnet"].(string), in["box_pub_key"].(string))}}, nil
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} else {
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return admin.Info{"not_removed": []string{fmt.Sprintf("%s via %s", in["subnet"].(string), in["box_pub_key"].(string))}}, errors.New("Failed to remove route")
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@ -21,12 +21,12 @@ type cryptokey struct {
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tun *TunAdapter
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enabled atomic.Value // bool
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reconfigure chan chan error
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ipv4routes []cryptokey_route
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ipv6routes []cryptokey_route
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ipv4remotes []cryptokey_route
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ipv6remotes []cryptokey_route
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ipv4cache map[address.Address]cryptokey_route
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ipv6cache map[address.Address]cryptokey_route
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ipv4sources []net.IPNet
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ipv6sources []net.IPNet
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ipv4locals []net.IPNet
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ipv6locals []net.IPNet
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mutexroutes sync.RWMutex
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mutexcaches sync.RWMutex
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mutexsources sync.RWMutex
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@ -66,42 +66,42 @@ func (c *cryptokey) configure() error {
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// Clear out existing routes
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c.mutexroutes.Lock()
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c.ipv6routes = make([]cryptokey_route, 0)
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c.ipv4routes = make([]cryptokey_route, 0)
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c.ipv6remotes = make([]cryptokey_route, 0)
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c.ipv4remotes = make([]cryptokey_route, 0)
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c.mutexroutes.Unlock()
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// Add IPv6 routes
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for ipv6, pubkey := range current.TunnelRouting.IPv6Destinations {
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if err := c.addRoute(ipv6, pubkey); err != nil {
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for ipv6, pubkey := range current.TunnelRouting.IPv6RemoteSubnets {
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if err := c.addRemoteSubnet(ipv6, pubkey); err != nil {
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return err
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}
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}
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// Add IPv4 routes
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for ipv4, pubkey := range current.TunnelRouting.IPv4Destinations {
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if err := c.addRoute(ipv4, pubkey); err != nil {
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for ipv4, pubkey := range current.TunnelRouting.IPv4RemoteSubnets {
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if err := c.addRemoteSubnet(ipv4, pubkey); err != nil {
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return err
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}
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}
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// Clear out existing sources
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c.mutexsources.Lock()
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c.ipv6sources = make([]net.IPNet, 0)
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c.ipv4sources = make([]net.IPNet, 0)
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c.ipv6locals = make([]net.IPNet, 0)
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c.ipv4locals = make([]net.IPNet, 0)
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c.mutexsources.Unlock()
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// Add IPv6 sources
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c.ipv6sources = make([]net.IPNet, 0)
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for _, source := range current.TunnelRouting.IPv6Sources {
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if err := c.addSourceSubnet(source); err != nil {
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c.ipv6locals = make([]net.IPNet, 0)
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for _, source := range current.TunnelRouting.IPv6LocalSubnets {
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if err := c.addLocalSubnet(source); err != nil {
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return err
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}
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}
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// Add IPv4 sources
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c.ipv4sources = make([]net.IPNet, 0)
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for _, source := range current.TunnelRouting.IPv4Sources {
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if err := c.addSourceSubnet(source); err != nil {
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c.ipv4locals = make([]net.IPNet, 0)
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for _, source := range current.TunnelRouting.IPv4LocalSubnets {
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if err := c.addLocalSubnet(source); err != nil {
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return err
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}
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}
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@ -128,8 +128,8 @@ func (c *cryptokey) isEnabled() bool {
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// Check whether the given address (with the address length specified in bytes)
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// matches either the current node's address, the node's routed subnet or the
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// list of subnets specified in IPv4Sources/IPv6Sources.
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func (c *cryptokey) isValidSource(addr address.Address, addrlen int) bool {
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// list of subnets specified in ipv4locals/ipv6locals.
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func (c *cryptokey) isValidLocalAddress(addr address.Address, addrlen int) bool {
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c.mutexsources.RLock()
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defer c.mutexsources.RUnlock()
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@ -154,9 +154,9 @@ func (c *cryptokey) isValidSource(addr address.Address, addrlen int) bool {
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// Check if the prefix is IPv4 or IPv6
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if addrlen == net.IPv6len {
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routingsources = &c.ipv6sources
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routingsources = &c.ipv6locals
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} else if addrlen == net.IPv4len {
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routingsources = &c.ipv4sources
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routingsources = &c.ipv4locals
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} else {
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return false
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}
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@ -174,7 +174,7 @@ func (c *cryptokey) isValidSource(addr address.Address, addrlen int) bool {
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// Adds a source subnet, which allows traffic with these source addresses to
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// be tunnelled using crypto-key routing.
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func (c *cryptokey) addSourceSubnet(cidr string) error {
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func (c *cryptokey) addLocalSubnet(cidr string) error {
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c.mutexsources.Lock()
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defer c.mutexsources.Unlock()
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@ -192,9 +192,9 @@ func (c *cryptokey) addSourceSubnet(cidr string) error {
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// Check if the prefix is IPv4 or IPv6
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if prefixsize == net.IPv6len*8 {
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routingsources = &c.ipv6sources
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routingsources = &c.ipv6locals
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} else if prefixsize == net.IPv4len*8 {
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routingsources = &c.ipv4sources
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routingsources = &c.ipv4locals
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} else {
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return errors.New("Unexpected prefix size")
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}
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@ -214,7 +214,7 @@ func (c *cryptokey) addSourceSubnet(cidr string) error {
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// Adds a destination route for the given CIDR to be tunnelled to the node
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// with the given BoxPubKey.
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func (c *cryptokey) addRoute(cidr string, dest string) error {
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func (c *cryptokey) addRemoteSubnet(cidr string, dest string) error {
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c.mutexroutes.Lock()
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c.mutexcaches.Lock()
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defer c.mutexroutes.Unlock()
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@ -235,10 +235,10 @@ func (c *cryptokey) addRoute(cidr string, dest string) error {
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// Check if the prefix is IPv4 or IPv6
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if prefixsize == net.IPv6len*8 {
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routingtable = &c.ipv6routes
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routingtable = &c.ipv6remotes
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routingcache = &c.ipv6cache
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} else if prefixsize == net.IPv4len*8 {
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routingtable = &c.ipv4routes
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routingtable = &c.ipv4remotes
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routingcache = &c.ipv4cache
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} else {
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return errors.New("Unexpected prefix size")
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@ -328,9 +328,9 @@ func (c *cryptokey) getPublicKeyForAddress(addr address.Address, addrlen int) (c
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// Check if the prefix is IPv4 or IPv6
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if addrlen == net.IPv6len {
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routingtable = &c.ipv6routes
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routingtable = &c.ipv6remotes
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} else if addrlen == net.IPv4len {
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routingtable = &c.ipv4routes
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routingtable = &c.ipv4remotes
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} else {
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return crypto.BoxPubKey{}, errors.New("Unexpected prefix size")
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}
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@ -339,7 +339,7 @@ func (c *cryptokey) getPublicKeyForAddress(addr address.Address, addrlen int) (c
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ip := make(net.IP, addrlen)
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copy(ip[:addrlen], addr[:])
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// Check if we have a route. At this point c.ipv6routes should be
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// Check if we have a route. At this point c.ipv6remotes should be
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// pre-sorted so that the most specific routes are first
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for _, route := range *routingtable {
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// Does this subnet match the given IP?
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@ -371,7 +371,7 @@ func (c *cryptokey) getPublicKeyForAddress(addr address.Address, addrlen int) (c
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// Removes a source subnet, which allows traffic with these source addresses to
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// be tunnelled using crypto-key routing.
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func (c *cryptokey) removeSourceSubnet(cidr string) error {
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func (c *cryptokey) removeLocalSubnet(cidr string) error {
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c.mutexsources.Lock()
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defer c.mutexsources.Unlock()
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@ -389,9 +389,9 @@ func (c *cryptokey) removeSourceSubnet(cidr string) error {
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// Check if the prefix is IPv4 or IPv6
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if prefixsize == net.IPv6len*8 {
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routingsources = &c.ipv6sources
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routingsources = &c.ipv6locals
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} else if prefixsize == net.IPv4len*8 {
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routingsources = &c.ipv4sources
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routingsources = &c.ipv4locals
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} else {
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return errors.New("Unexpected prefix size")
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}
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@ -409,7 +409,7 @@ func (c *cryptokey) removeSourceSubnet(cidr string) error {
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// Removes a destination route for the given CIDR to be tunnelled to the node
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// with the given BoxPubKey.
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func (c *cryptokey) removeRoute(cidr string, dest string) error {
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func (c *cryptokey) removeRemoteSubnet(cidr string, dest string) error {
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c.mutexroutes.Lock()
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c.mutexcaches.Lock()
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defer c.mutexroutes.Unlock()
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@ -430,10 +430,10 @@ func (c *cryptokey) removeRoute(cidr string, dest string) error {
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// Check if the prefix is IPv4 or IPv6
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if prefixsize == net.IPv6len*8 {
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routingtable = &c.ipv6routes
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routingtable = &c.ipv6remotes
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routingcache = &c.ipv6cache
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} else if prefixsize == net.IPv4len*8 {
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routingtable = &c.ipv4routes
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routingtable = &c.ipv4remotes
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routingcache = &c.ipv4cache
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} else {
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return errors.New("Unexpected prefix size")
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@ -21,25 +21,50 @@ func (tun *TunAdapter) writer() error {
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if n == 0 {
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continue
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}
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if tun.iface.IsTAP() {
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var dstAddr address.Address
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if b[0]&0xf0 == 0x60 {
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if len(b) < 40 {
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//panic("Tried to send a packet shorter than an IPv6 header...")
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util.PutBytes(b)
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continue
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}
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copy(dstAddr[:16], b[24:])
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} else if b[0]&0xf0 == 0x40 {
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if len(b) < 20 {
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//panic("Tried to send a packet shorter than an IPv4 header...")
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util.PutBytes(b)
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continue
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}
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copy(dstAddr[:4], b[16:])
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} else {
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return errors.New("Invalid address family")
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var dstAddr address.Address
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var addrlen int
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// Check whether the packet is IPv4, IPv6 or neither
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if b[0]&0xf0 == 0x60 {
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// IPv6 packet found
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if len(b) < 40 {
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// Packet was too short
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util.PutBytes(b)
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continue
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}
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// Extract the destination IPv6 address
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copy(dstAddr[:16], b[24:])
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addrlen = 16
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} else if b[0]&0xf0 == 0x40 {
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// IPv4 packet found
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if len(b) < 20 {
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// Packet was too short
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util.PutBytes(b)
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continue
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}
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// Extract the destination IPv4 address
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copy(dstAddr[:4], b[16:])
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addrlen = 4
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} else {
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// Neither IPv4 nor IPv6
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return errors.New("Invalid address family")
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}
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// Check the crypto-key routing rules next
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if tun.ckr.isEnabled() {
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if !tun.ckr.isValidLocalAddress(dstAddr, addrlen) {
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util.PutBytes(b)
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continue
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}
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} else {
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if addrlen != 16 {
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util.PutBytes(b)
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continue
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}
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if !bytes.Equal(tun.addr[:16], dstAddr[:16]) && !bytes.Equal(tun.subnet[:8], dstAddr[:8]) {
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util.PutBytes(b)
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continue
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}
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}
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if tun.iface.IsTAP() {
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sendndp := func(dstAddr address.Address) {
|
||||
neigh, known := tun.icmpv6.getNeighbor(dstAddr)
|
||||
known = known && (time.Since(neigh.lastsolicitation).Seconds() < 30)
|
||||
@ -69,7 +94,6 @@ func (tun *TunAdapter) writer() error {
|
||||
} else {
|
||||
// Nothing has been discovered, try to discover the destination
|
||||
sendndp(tun.addr)
|
||||
|
||||
}
|
||||
if peerknown {
|
||||
var proto ethernet.Ethertype
|
||||
@ -187,26 +211,33 @@ func (tun *TunAdapter) readerPacketHandler(ch chan []byte) {
|
||||
tun.log.Traceln("Unknown packet type, dropping")
|
||||
continue
|
||||
}
|
||||
if tun.ckr.isEnabled() && !tun.ckr.isValidSource(srcAddr, addrlen) {
|
||||
// The packet had a source address that doesn't belong to us or our
|
||||
// configured crypto-key routing source subnets
|
||||
continue
|
||||
}
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
if key, err := tun.ckr.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
|
||||
// A public key was found, get the node ID for the search
|
||||
dstNodeID = crypto.GetNodeID(&key)
|
||||
// Do a quick check to ensure that the node ID refers to a vaild
|
||||
// Yggdrasil address or subnet - this might be superfluous
|
||||
addr := *address.AddrForNodeID(dstNodeID)
|
||||
copy(dstAddr[:], addr[:])
|
||||
copy(dstSnet[:], addr[:])
|
||||
// Are we certain we looked up a valid node?
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
if tun.ckr.isEnabled() {
|
||||
if !tun.ckr.isValidLocalAddress(srcAddr, addrlen) {
|
||||
continue
|
||||
}
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
if key, err := tun.ckr.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
|
||||
// A public key was found, get the node ID for the search
|
||||
dstNodeID = crypto.GetNodeID(&key)
|
||||
// Do a quick check to ensure that the node ID refers to a vaild
|
||||
// Yggdrasil address or subnet - this might be superfluous
|
||||
addr := *address.AddrForNodeID(dstNodeID)
|
||||
copy(dstAddr[:], addr[:])
|
||||
copy(dstSnet[:], addr[:])
|
||||
// Are we certain we looked up a valid node?
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
continue
|
||||
}
|
||||
} else {
|
||||
// No public key was found in the CKR table so we've exhausted our options
|
||||
continue
|
||||
}
|
||||
} else {
|
||||
// No public key was found in the CKR table so we've exhausted our options
|
||||
}
|
||||
} else {
|
||||
if addrlen != 16 {
|
||||
continue
|
||||
}
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
continue
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user