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api.go
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api.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 secrets
import (
"context"
stdlibx509 "crypto/x509"
"errors"
"fmt"
"time"
"github.com/cosi-project/runtime/pkg/controller"
"github.com/cosi-project/runtime/pkg/resource"
"github.com/cosi-project/runtime/pkg/state"
"github.com/siderolabs/crypto/x509"
"github.com/siderolabs/gen/optional"
"go.uber.org/zap"
"github.com/siderolabs/talos/pkg/grpc/gen"
"github.com/siderolabs/talos/pkg/machinery/config/machine"
"github.com/siderolabs/talos/pkg/machinery/resources/config"
"github.com/siderolabs/talos/pkg/machinery/resources/k8s"
"github.com/siderolabs/talos/pkg/machinery/resources/network"
"github.com/siderolabs/talos/pkg/machinery/resources/secrets"
timeresource "github.com/siderolabs/talos/pkg/machinery/resources/time"
"github.com/siderolabs/talos/pkg/machinery/resources/v1alpha1"
"github.com/siderolabs/talos/pkg/machinery/role"
)
// APIController manages secrets.API based on configuration to provide apid certificate.
type APIController struct{}
// Name implements controller.Controller interface.
func (ctrl *APIController) Name() string {
return "secrets.APIController"
}
// Inputs implements controller.Controller interface.
func (ctrl *APIController) Inputs() []controller.Input {
// initial set of inputs: wait for machine type to be known and network to be partially configured
return []controller.Input{
{
Namespace: network.NamespaceName,
Type: network.StatusType,
ID: optional.Some(network.StatusID),
Kind: controller.InputWeak,
},
{
Namespace: config.NamespaceName,
Type: config.MachineTypeType,
ID: optional.Some(config.MachineTypeID),
Kind: controller.InputWeak,
},
}
}
// Outputs implements controller.Controller interface.
func (ctrl *APIController) Outputs() []controller.Output {
return []controller.Output{
{
Type: secrets.APIType,
Kind: controller.OutputExclusive,
},
}
}
// Run implements controller.Controller interface.
//
//nolint:gocyclo
func (ctrl *APIController) Run(ctx context.Context, r controller.Runtime, logger *zap.Logger) error {
for {
select {
case <-ctx.Done():
return nil
case <-r.EventCh():
}
// reset inputs back to what they were initially
if err := r.UpdateInputs(ctrl.Inputs()); err != nil {
return err
}
machineTypeRes, err := r.Get(ctx, resource.NewMetadata(config.NamespaceName, config.MachineTypeType, config.MachineTypeID, resource.VersionUndefined))
if err != nil {
if state.IsNotFoundError(err) {
continue
}
return fmt.Errorf("error getting machine type: %w", err)
}
machineType := machineTypeRes.(*config.MachineType).MachineType()
networkResource, err := r.Get(ctx, resource.NewMetadata(network.NamespaceName, network.StatusType, network.StatusID, resource.VersionUndefined))
if err != nil {
if state.IsNotFoundError(err) {
continue
}
return err
}
networkStatus := networkResource.(*network.Status).TypedSpec()
if !(networkStatus.AddressReady && networkStatus.HostnameReady) {
continue
}
// machine type is known and network is ready, we can now proceed to one or another reconcile loop
switch machineType {
case machine.TypeInit, machine.TypeControlPlane:
if err = ctrl.reconcile(ctx, r, logger, true); err != nil {
return err
}
case machine.TypeWorker:
if err = ctrl.reconcile(ctx, r, logger, false); err != nil {
return err
}
case machine.TypeUnknown:
// machine configuration is not loaded yet, do nothing
default:
panic(fmt.Sprintf("unexpected machine type %v", machineType))
}
if err = ctrl.teardownAll(ctx, r); err != nil {
return err
}
r.ResetRestartBackoff()
}
}
//nolint:gocyclo,cyclop,dupl
func (ctrl *APIController) reconcile(ctx context.Context, r controller.Runtime, logger *zap.Logger, isControlplane bool) error {
inputs := []controller.Input{
{
Namespace: secrets.NamespaceName,
Type: secrets.OSRootType,
ID: optional.Some(secrets.OSRootID),
Kind: controller.InputWeak,
},
{
Namespace: secrets.NamespaceName,
Type: secrets.CertSANType,
ID: optional.Some(secrets.CertSANAPIID),
Kind: controller.InputWeak,
},
{
Namespace: config.NamespaceName,
Type: config.MachineTypeType,
ID: optional.Some(config.MachineTypeID),
Kind: controller.InputWeak,
},
// time status isn't fetched, but the fact that it is in dependencies means
// that certs will be regenerated on time sync/jump (as reconcile will be triggered)
{
Namespace: v1alpha1.NamespaceName,
Type: timeresource.StatusType,
ID: optional.Some(timeresource.StatusID),
Kind: controller.InputWeak,
},
}
if !isControlplane {
// worker nodes depend on endpoint list
inputs = append(inputs, controller.Input{
Namespace: k8s.ControlPlaneNamespaceName,
Type: k8s.EndpointType,
Kind: controller.InputWeak,
})
}
if err := r.UpdateInputs(inputs); err != nil {
return fmt.Errorf("error updating inputs: %w", err)
}
r.QueueReconcile()
refreshTicker := time.NewTicker(x509.DefaultCertificateValidityDuration / 2)
defer refreshTicker.Stop()
for {
select {
case <-ctx.Done():
return nil
case <-r.EventCh():
case <-refreshTicker.C:
}
machineTypeRes, err := r.Get(ctx, resource.NewMetadata(config.NamespaceName, config.MachineTypeType, config.MachineTypeID, resource.VersionUndefined))
if err != nil {
if state.IsNotFoundError(err) {
continue
}
return fmt.Errorf("error getting machine type: %w", err)
}
machineType := machineTypeRes.(*config.MachineType).MachineType()
switch machineType {
case machine.TypeInit, machine.TypeControlPlane:
if !isControlplane {
return errors.New("machine type changed")
}
case machine.TypeWorker:
if isControlplane {
return errors.New("machine type changed")
}
case machine.TypeUnknown:
return errors.New("machine type changed")
default:
panic(fmt.Sprintf("unexpected machine type %v", machineType))
}
rootResource, err := r.Get(ctx, resource.NewMetadata(secrets.NamespaceName, secrets.OSRootType, secrets.OSRootID, resource.VersionUndefined))
if err != nil {
if state.IsNotFoundError(err) {
if err = ctrl.teardownAll(ctx, r); err != nil {
return fmt.Errorf("error destroying resources: %w", err)
}
continue
}
return fmt.Errorf("error getting etcd root secrets: %w", err)
}
rootSpec := rootResource.(*secrets.OSRoot).TypedSpec()
certSANResource, err := r.Get(ctx, resource.NewMetadata(secrets.NamespaceName, secrets.CertSANType, secrets.CertSANAPIID, resource.VersionUndefined))
if err != nil {
if state.IsNotFoundError(err) {
continue
}
return fmt.Errorf("error getting certSANs: %w", err)
}
certSANs := certSANResource.(*secrets.CertSAN).TypedSpec()
var endpointsStr []string
if !isControlplane {
endpointResources, err := r.List(ctx, resource.NewMetadata(k8s.ControlPlaneNamespaceName, k8s.EndpointType, "", resource.VersionUndefined))
if err != nil {
return fmt.Errorf("error getting endpoints resources: %w", err)
}
var endpointAddrs k8s.EndpointList
// merge all endpoints into a single list
for _, res := range endpointResources.Items {
endpointAddrs = endpointAddrs.Merge(res.(*k8s.Endpoint))
}
if len(endpointAddrs) == 0 {
continue
}
endpointsStr = endpointAddrs.Strings()
}
if isControlplane {
if err := ctrl.generateControlPlane(ctx, r, logger, rootSpec, certSANs); err != nil {
return err
}
} else {
if err := ctrl.generateWorker(ctx, r, logger, rootSpec, endpointsStr, certSANs); err != nil {
return err
}
}
r.ResetRestartBackoff()
}
}
func (ctrl *APIController) generateControlPlane(ctx context.Context, r controller.Runtime, logger *zap.Logger, rootSpec *secrets.OSRootSpec, certSANs *secrets.CertSANSpec) error {
ca, err := x509.NewCertificateAuthorityFromCertificateAndKey(rootSpec.IssuingCA)
if err != nil {
return fmt.Errorf("failed to parse CA certificate: %w", err)
}
serverCert, err := x509.NewKeyPair(ca,
x509.IPAddresses(certSANs.StdIPs()),
x509.DNSNames(certSANs.DNSNames),
x509.CommonName(certSANs.FQDN),
x509.NotAfter(time.Now().Add(x509.DefaultCertificateValidityDuration)),
x509.KeyUsage(stdlibx509.KeyUsageDigitalSignature),
x509.ExtKeyUsage([]stdlibx509.ExtKeyUsage{
stdlibx509.ExtKeyUsageServerAuth,
}),
)
if err != nil {
return fmt.Errorf("failed to generate API server cert: %w", err)
}
clientCert, err := x509.NewKeyPair(ca,
x509.CommonName(certSANs.FQDN),
x509.Organization(string(role.Impersonator)),
x509.NotAfter(time.Now().Add(x509.DefaultCertificateValidityDuration)),
x509.KeyUsage(stdlibx509.KeyUsageDigitalSignature),
x509.ExtKeyUsage([]stdlibx509.ExtKeyUsage{
stdlibx509.ExtKeyUsageClientAuth,
}),
)
if err != nil {
return fmt.Errorf("failed to generate API client cert: %w", err)
}
if err := r.Modify(ctx, secrets.NewAPI(),
func(r resource.Resource) error {
apiSecrets := r.(*secrets.API).TypedSpec()
apiSecrets.AcceptedCAs = rootSpec.AcceptedCAs
apiSecrets.Server = x509.NewCertificateAndKeyFromKeyPair(serverCert)
apiSecrets.Client = x509.NewCertificateAndKeyFromKeyPair(clientCert)
return nil
}); err != nil {
return fmt.Errorf("error modifying resource: %w", err)
}
clientFingerprint, _ := x509.SPKIFingerprintFromDER(clientCert.Certificate.Certificate[0]) //nolint:errcheck
serverFingerprint, _ := x509.SPKIFingerprintFromDER(serverCert.Certificate.Certificate[0]) //nolint:errcheck
logger.Debug("generated new certificates",
zap.Stringer("client", clientFingerprint),
zap.Stringer("server", serverFingerprint),
)
return nil
}
func (ctrl *APIController) generateWorker(ctx context.Context, r controller.Runtime, logger *zap.Logger,
rootSpec *secrets.OSRootSpec, endpointsStr []string, certSANs *secrets.CertSANSpec,
) error {
remoteGen, err := gen.NewRemoteGenerator(rootSpec.Token, endpointsStr, rootSpec.IssuingCA)
if err != nil {
return fmt.Errorf("failed creating trustd client: %w", err)
}
defer remoteGen.Close() //nolint:errcheck
serverCSR, serverCert, err := x509.NewEd25519CSRAndIdentity(
x509.IPAddresses(certSANs.StdIPs()),
x509.DNSNames(certSANs.DNSNames),
x509.CommonName(certSANs.FQDN),
)
if err != nil {
return fmt.Errorf("failed to generate API server CSR: %w", err)
}
logger.Debug("sending CSR", zap.Strings("endpoints", endpointsStr))
var ca []byte
// run the CSR generation in a goroutine, so we can abort the request if the inputs change
errCh := make(chan error)
ctx, cancel := context.WithCancel(ctx)
defer cancel()
go func() {
ca, serverCert.Crt, err = remoteGen.IdentityContext(ctx, serverCSR)
errCh <- err
}()
select {
case <-r.EventCh():
// there's an update to the inputs, terminate the attempt, and let the controller handle the retry
cancel()
// re-queue the reconcile event, so that controller retries with new inputs
r.QueueReconcile()
// wait for the goroutine to finish, ignoring the error (should be context.Canceled)
<-errCh
return nil
case err = <-errCh:
}
if err != nil {
return fmt.Errorf("failed to sign API server CSR: %w", err)
}
if err := r.Modify(ctx, secrets.NewAPI(),
func(r resource.Resource) error {
apiSecrets := r.(*secrets.API).TypedSpec()
apiSecrets.AcceptedCAs = []*x509.PEMEncodedCertificate{
{
Crt: ca,
},
}
apiSecrets.Server = serverCert
return nil
}); err != nil {
return fmt.Errorf("error modifying resource: %w", err)
}
serverFingerprint, _ := x509.SPKIFingerprintFromPEM(serverCert.Crt) //nolint:errcheck
logger.Debug("generated new certificates",
zap.Stringer("server", serverFingerprint),
)
return nil
}
func (ctrl *APIController) teardownAll(ctx context.Context, r controller.Runtime) error {
list, err := r.List(ctx, resource.NewMetadata(secrets.NamespaceName, secrets.APIType, "", resource.VersionUndefined))
if err != nil {
return err
}
for _, res := range list.Items {
if err = r.Destroy(ctx, res.Metadata()); err != nil {
return err
}
}
return nil
}