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siderolink.go
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siderolink.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package controllers
import (
"bytes"
"context"
"crypto/tls"
"errors"
"fmt"
"net/netip"
"os"
"time"
"github.com/cosi-project/runtime/pkg/controller"
"github.com/cosi-project/runtime/pkg/resource"
"github.com/cosi-project/runtime/pkg/safe"
"github.com/cosi-project/runtime/pkg/state"
"github.com/siderolabs/gen/optional"
pointer "github.com/siderolabs/go-pointer"
pb "github.com/siderolabs/siderolink/api/siderolink"
"github.com/siderolabs/siderolink/pkg/wireguard"
"github.com/siderolabs/talos/pkg/machinery/constants"
"github.com/siderolabs/talos/pkg/machinery/nethelpers"
"github.com/siderolabs/talos/pkg/machinery/resources/config"
"github.com/siderolabs/talos/pkg/machinery/resources/hardware"
"github.com/siderolabs/talos/pkg/machinery/resources/network"
"github.com/siderolabs/talos/pkg/machinery/resources/runtime"
"github.com/siderolabs/talos/pkg/machinery/resources/siderolink"
"github.com/siderolabs/talos/pkg/machinery/version"
"go.uber.org/zap"
"golang.zx2c4.com/wireguard/wgctrl"
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/insecure"
)
// ManagerController interacts with SideroLink API and brings up the SideroLink Wireguard interface.
type ManagerController struct {
pd provisionData
nodeKey wgtypes.Key
MachineIndex int
}
func (ctrl *ManagerController) interfaceName() string {
return fmt.Sprintf("%s%d", constants.SideroLinkName, ctrl.MachineIndex)
}
// Name implements controller.Controller interface.
func (ctrl *ManagerController) Name() string {
return "siderolink.ManagerController"
}
// Inputs implements controller.Controller interface.
func (ctrl *ManagerController) Inputs() []controller.Input {
return []controller.Input{
{
Namespace: config.NamespaceName,
Type: siderolink.ConfigType,
ID: optional.Some(siderolink.ConfigID),
Kind: controller.InputWeak,
},
{
Namespace: hardware.NamespaceName,
Type: hardware.SystemInformationType,
ID: optional.Some(hardware.SystemInformationID),
Kind: controller.InputWeak,
},
{
Namespace: runtime.NamespaceName,
Type: runtime.UniqueMachineTokenType,
ID: optional.Some(runtime.UniqueMachineTokenID),
Kind: controller.InputWeak,
},
}
}
// Outputs implements controller.Controller interface.
func (ctrl *ManagerController) Outputs() []controller.Output {
return []controller.Output{
{
Type: network.AddressSpecType,
Kind: controller.OutputShared,
},
{
Type: network.LinkSpecType,
Kind: controller.OutputShared,
},
{
Type: siderolink.TunnelType,
Kind: controller.OutputExclusive,
},
}
}
// Run implements controller.Controller interface.
//
//nolint:gocyclo,cyclop,gocognit
func (ctrl *ManagerController) Run(ctx context.Context, r controller.Runtime, logger *zap.Logger) error {
wgClient, wgClientErr := wgctrl.New()
if wgClientErr != nil {
return wgClientErr
}
defer func() {
if closeErr := wgClient.Close(); closeErr != nil {
logger.Error("failed to close wg client", zap.Error(closeErr))
}
}()
var zeroKey wgtypes.Key
if bytes.Equal(ctrl.nodeKey[:], zeroKey[:]) {
var err error
ctrl.nodeKey, err = wgtypes.GeneratePrivateKey()
if err != nil {
return fmt.Errorf("error generating Wireguard key: %w", err)
}
}
ticker := time.NewTicker(30 * time.Second)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return nil
case <-ticker.C:
reconnect, err := ctrl.shouldReconnect(wgClient)
if err != nil {
return err
}
if !reconnect {
// nothing to do
continue
}
case <-r.EventCh():
}
if ctrl.pd.IsEmpty() {
provision, err := ctrl.provision(ctx, r, logger)
if err != nil {
return fmt.Errorf("error provisioning: %w", err)
}
if !provision.IsPresent() {
continue
}
ctrl.pd = provision.ValueOrZero()
}
serverAddress, err := netip.ParseAddr(ctrl.pd.ServerAddress)
if err != nil {
return fmt.Errorf("error parsing server address: %w", err)
}
nodeAddress, err := netip.ParsePrefix(ctrl.pd.NodeAddressPrefix)
if err != nil {
return fmt.Errorf("error parsing node address: %w", err)
}
linkSpec := network.NewLinkSpec(network.NamespaceName, network.LayeredID(network.ConfigOperator, network.LinkID(ctrl.interfaceName())))
addressSpec := network.NewAddressSpec(network.NamespaceName, network.LayeredID(network.ConfigOperator, network.AddressID(ctrl.interfaceName(), nodeAddress)))
// Rotate through the endpoints.
ep, ok := ctrl.pd.TakeEndpoint()
if !ok {
return errors.New("host returned no endpoints")
}
logger.Info(
"configuring siderolink connection",
zap.String("peer_endpoint", ep),
zap.String("next_peer_endpoint", ctrl.pd.PeekNextEndpoint()),
)
if err = safe.WriterModify(ctx, r, linkSpec,
func(res *network.LinkSpec) error {
spec := res.TypedSpec()
spec.ConfigLayer = network.ConfigOperator
spec.Name = ctrl.interfaceName()
spec.Type = nethelpers.LinkNone
spec.Kind = "wireguard"
spec.Up = true
spec.Logical = ctrl.pd.grpcPeerAddrPort == ""
spec.MTU = wireguard.LinkMTU
spec.Wireguard = network.WireguardSpec{
PrivateKey: ctrl.nodeKey.String(),
Peers: []network.WireguardPeer{
{
PublicKey: ctrl.pd.ServerPublicKey,
Endpoint: ep,
AllowedIPs: []netip.Prefix{
netip.PrefixFrom(serverAddress, serverAddress.BitLen()),
},
// make sure Talos pings SideroLink endpoint, so that tunnel is established:
// SideroLink doesn't know Talos endpoint.
PersistentKeepaliveInterval: constants.SideroLinkDefaultPeerKeepalive,
},
},
}
spec.Wireguard.Sort()
return nil
}); err != nil {
return fmt.Errorf("error creating siderolink spec: %w", err)
}
if err = safe.WriterModify(ctx, r, addressSpec,
func(res *network.AddressSpec) error {
spec := res.TypedSpec()
spec.ConfigLayer = network.ConfigOperator
spec.Address = nodeAddress
spec.Family = nethelpers.FamilyInet6
spec.Flags = nethelpers.AddressFlags(nethelpers.AddressPermanent)
spec.LinkName = ctrl.interfaceName()
spec.Scope = nethelpers.ScopeGlobal
return nil
}); err != nil {
return fmt.Errorf("error creating address spec: %w", err)
}
if ctrl.pd.grpcPeerAddrPort != "" {
var ourAddr netip.AddrPort
ourAddr, err = netip.ParseAddrPort(ctrl.pd.grpcPeerAddrPort)
if err != nil {
return err
}
if err = safe.WriterModify(ctx, r, siderolink.NewTunnel(),
func(tunnel *siderolink.Tunnel) error {
tunnel.TypedSpec().APIEndpoint = ctrl.pd.apiEndpont
tunnel.TypedSpec().LinkName = ctrl.interfaceName()
tunnel.TypedSpec().MTU = wireguard.LinkMTU
tunnel.TypedSpec().NodeAddress = ourAddr
return nil
},
); err != nil {
return fmt.Errorf("error creating tunnel spec: %w", err)
}
} else {
if err = r.Destroy(ctx, siderolink.NewTunnel().Metadata()); err != nil && !state.IsNotFoundError(err) {
return fmt.Errorf("error destroying tunnel spec: %w", err)
}
}
keepLinkSpecSet := map[resource.ID]struct{}{
linkSpec.Metadata().ID(): {},
}
keepAddressSpecSet := map[resource.ID]struct{}{
addressSpec.Metadata().ID(): {},
}
if err := ctrl.cleanup(ctx, r, keepLinkSpecSet, keepAddressSpecSet, logger); err != nil {
return err
}
logger.Info(
"siderolink connection configured",
zap.String("endpoint", ctrl.pd.apiEndpont),
zap.String("node_uuid", ctrl.pd.nodeUUID),
zap.String("node_address", nodeAddress.String()),
)
}
}
func (ctrl *ManagerController) provision(ctx context.Context, r controller.Runtime, logger *zap.Logger) (optional.Optional[provisionData], error) {
cfg, err := safe.ReaderGetByID[*siderolink.Config](ctx, r, siderolink.ConfigID)
if err != nil {
if state.IsNotFoundError(err) {
if cleanupErr := ctrl.cleanup(ctx, r, nil, nil, logger); cleanupErr != nil {
return optional.None[provisionData](), fmt.Errorf("failed to do cleanup: %w", cleanupErr)
}
// no config
return optional.None[provisionData](), nil
}
return optional.None[provisionData](), fmt.Errorf("failed to get siderolink config: %w", err)
}
sysInfo, err := safe.ReaderGetByID[*hardware.SystemInformation](ctx, r, hardware.SystemInformationID)
if err != nil {
if state.IsNotFoundError(err) {
// no system information
return optional.None[provisionData](), nil
}
return optional.None[provisionData](), fmt.Errorf("failed to get system information: %w", err)
}
nodeUUID := sysInfo.TypedSpec().UUID
provision := func() (*pb.ProvisionResponse, error) {
conn, connErr := grpc.Dial(
cfg.TypedSpec().Host,
withTransportCredentials(cfg.TypedSpec().Insecure),
grpc.WithSharedWriteBuffer(true),
)
if connErr != nil {
return nil, fmt.Errorf("error dialing SideroLink endpoint %q: %w", cfg.TypedSpec().Host, connErr)
}
defer func() {
if closeErr := conn.Close(); closeErr != nil {
logger.Error("failed to close SideroLink provisioning GRPC connection", zap.Error(closeErr))
}
}()
uniqTokenRes, rdrErr := safe.ReaderGetByID[*runtime.UniqueMachineToken](ctx, r, runtime.UniqueMachineTokenID)
if rdrErr != nil {
return nil, fmt.Errorf("failed to get unique token: %w", rdrErr)
}
var wgOverGRPC *bool
if cfg.TypedSpec().Tunnel {
wgOverGRPC = pointer.To(true)
}
sideroLinkClient := pb.NewProvisionServiceClient(conn)
request := &pb.ProvisionRequest{
NodeUuid: nodeUUID,
NodePublicKey: ctrl.nodeKey.PublicKey().String(),
NodeUniqueToken: pointer.To(uniqTokenRes.TypedSpec().Token),
TalosVersion: pointer.To(version.Tag),
WireguardOverGrpc: wgOverGRPC,
}
token := cfg.TypedSpec().JoinToken
if token != "" {
request.JoinToken = pointer.To(token)
}
return sideroLinkClient.Provision(ctx, request)
}
resp, err := provision()
if err != nil {
return optional.None[provisionData](), err
}
return optional.Some(provisionData{
nodeUUID: nodeUUID,
apiEndpont: cfg.TypedSpec().APIEndpoint,
ServerAddress: resp.ServerAddress,
ServerPublicKey: resp.ServerPublicKey,
NodeAddressPrefix: resp.NodeAddressPrefix,
endpoints: resp.GetEndpoints(),
grpcPeerAddrPort: resp.GrpcPeerAddrPort,
}), nil
}
type provisionData struct {
nodeUUID string
apiEndpont string
ServerAddress string
ServerPublicKey string
NodeAddressPrefix string
grpcPeerAddrPort string
endpoints []string
}
func (d *provisionData) IsEmpty() bool {
return d == nil || len(d.endpoints) == 0
}
func (d *provisionData) TakeEndpoint() (string, bool) {
if d.IsEmpty() {
return "", false
}
ep := d.endpoints[0]
d.endpoints = d.endpoints[1:]
return ep, true
}
func (d *provisionData) PeekNextEndpoint() string {
if d.IsEmpty() {
return ""
}
return d.endpoints[0]
}
func (ctrl *ManagerController) cleanup(
ctx context.Context,
r controller.Runtime,
keepLinkSpecIDSet, keepAddressSpecIDSet map[resource.ID]struct{},
logger *zap.Logger,
) error {
if err := ctrl.cleanupLinkSpecs(ctx, r, keepLinkSpecIDSet, logger); err != nil {
return err
}
return ctrl.cleanupAddressSpecs(ctx, r, keepAddressSpecIDSet, logger)
}
//nolint:dupl
func (ctrl *ManagerController) cleanupLinkSpecs(ctx context.Context, r controller.Runtime, keepSet map[resource.ID]struct{}, logger *zap.Logger) error {
list, err := safe.ReaderList[*network.LinkSpec](ctx, r, network.NewLinkSpec(network.NamespaceName, "").Metadata())
if err != nil {
return err
}
for iter := list.Iterator(); iter.Next(); {
link := iter.Value()
if link.Metadata().Owner() != ctrl.Name() {
continue
}
if _, ok := keepSet[link.Metadata().ID()]; ok {
continue
}
if destroyErr := r.Destroy(ctx, link.Metadata()); destroyErr != nil && !state.IsNotFoundError(destroyErr) {
return destroyErr
}
logger.Info("destroyed link spec", zap.String("link_id", link.Metadata().ID()))
}
return nil
}
//nolint:dupl
func (ctrl *ManagerController) cleanupAddressSpecs(ctx context.Context, r controller.Runtime, keepSet map[resource.ID]struct{}, logger *zap.Logger) error {
list, err := safe.ReaderList[*network.AddressSpec](ctx, r, network.NewAddressSpec(network.NamespaceName, "").Metadata())
if err != nil {
return err
}
for iter := list.Iterator(); iter.Next(); {
address := iter.Value()
if address.Metadata().Owner() != ctrl.Name() {
continue
}
if _, ok := keepSet[address.Metadata().ID()]; ok {
continue
}
if destroyErr := r.Destroy(ctx, address.Metadata()); destroyErr != nil && !state.IsNotFoundError(destroyErr) {
return destroyErr
}
logger.Info("destroyed address spec", zap.String("address_id", address.Metadata().ID()))
}
return nil
}
func (ctrl *ManagerController) shouldReconnect(wgClient *wgctrl.Client) (bool, error) {
wgDevice, err := wgClient.Device(ctrl.interfaceName())
if err != nil {
if errors.Is(err, os.ErrNotExist) {
// no Wireguard device, so no need to reconnect
return false, nil
}
return false, fmt.Errorf("error reading Wireguard device: %w", err)
}
if len(wgDevice.Peers) != 1 {
return false, fmt.Errorf("unexpected number of Wireguard peers: %d", len(wgDevice.Peers))
}
peer := wgDevice.Peers[0]
since := time.Since(peer.LastHandshakeTime)
return since >= wireguard.PeerDownInterval, nil
}
func withTransportCredentials(insec bool) grpc.DialOption {
var transportCredentials credentials.TransportCredentials
if insec {
transportCredentials = insecure.NewCredentials()
} else {
transportCredentials = credentials.NewTLS(&tls.Config{})
}
return grpc.WithTransportCredentials(transportCredentials)
}