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serviceaccount.go
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/
serviceaccount.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 kubeaccess
import (
"context"
"errors"
"fmt"
"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/crypto/x509"
"github.com/siderolabs/gen/optional"
"go.uber.org/zap"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
"github.com/siderolabs/talos/internal/app/machined/pkg/controllers/kubeaccess/serviceaccount"
"github.com/siderolabs/talos/internal/pkg/etcd"
"github.com/siderolabs/talos/pkg/machinery/constants"
"github.com/siderolabs/talos/pkg/machinery/resources/config"
"github.com/siderolabs/talos/pkg/machinery/resources/kubeaccess"
"github.com/siderolabs/talos/pkg/machinery/resources/secrets"
)
// CRDController manages Kubernetes endpoints resource for Talos API endpoints.
type CRDController struct{}
// Name implements controller.Controller interface.
func (ctrl *CRDController) Name() string {
return "kubeaccess.CRDController"
}
// Inputs implements controller.Controller interface.
func (ctrl *CRDController) Inputs() []controller.Input {
return []controller.Input{
{
Namespace: config.NamespaceName,
Type: kubeaccess.ConfigType,
ID: optional.Some(kubeaccess.ConfigID),
Kind: controller.InputWeak,
},
{
Namespace: secrets.NamespaceName,
Type: secrets.KubernetesType,
ID: optional.Some(secrets.KubernetesID),
Kind: controller.InputWeak,
},
{
Namespace: secrets.NamespaceName,
Type: secrets.OSRootType,
ID: optional.Some(secrets.OSRootID),
Kind: controller.InputWeak,
},
}
}
// Outputs implements controller.Controller interface.
func (ctrl *CRDController) Outputs() []controller.Output {
return nil
}
// Run implements controller.Controller interface.
//
//nolint:gocyclo
func (ctrl *CRDController) Run(ctx context.Context, r controller.Runtime, logger *zap.Logger) error {
var crdControllerCtxCancel context.CancelFunc
crdControllerErrCh := make(chan error, 1)
stopCRDController := func() {
if crdControllerCtxCancel != nil {
crdControllerCtxCancel()
<-crdControllerErrCh
crdControllerCtxCancel = nil
}
}
defer stopCRDController()
for {
select {
case <-ctx.Done():
return nil //nolint:govet
case <-r.EventCh():
case err := <-crdControllerErrCh:
if crdControllerCtxCancel != nil {
crdControllerCtxCancel()
}
crdControllerCtxCancel = nil
if err != nil && !errors.Is(err, context.Canceled) {
return fmt.Errorf("error from crd controller: %w", err)
}
}
kubeaccessConfig, err := safe.ReaderGet[*kubeaccess.Config](ctx, r, kubeaccess.NewConfig(config.NamespaceName, kubeaccess.ConfigID).Metadata())
if err != nil {
if !state.IsNotFoundError(err) {
return fmt.Errorf("error fetching kubeaccess config: %w", err)
}
continue
}
var kubeaccessConfigSpec *kubeaccess.ConfigSpec
if kubeaccessConfig != nil {
kubeaccessConfigSpec = kubeaccessConfig.TypedSpec()
}
if kubeaccessConfig == nil || kubeaccessConfigSpec == nil || !kubeaccessConfigSpec.Enabled {
stopCRDController()
continue
}
kubeSecretsResources, err := safe.ReaderGet[*secrets.Kubernetes](ctx, r, resource.NewMetadata(
secrets.NamespaceName,
secrets.KubernetesType,
secrets.KubernetesID,
resource.VersionUndefined,
))
if err != nil {
if !state.IsNotFoundError(err) {
return fmt.Errorf("error fetching kubernetes secrets: %w", err)
}
continue
}
kubeSecretsSpec := kubeSecretsResources.TypedSpec()
osSecretsResource, err := safe.ReaderGet[*secrets.OSRoot](ctx, r, resource.NewMetadata(
secrets.NamespaceName,
secrets.OSRootType,
secrets.OSRootID,
resource.VersionUndefined,
))
if err != nil {
if !state.IsNotFoundError(err) {
return fmt.Errorf("error fetching os secrets: %w", err)
}
continue
}
osSecretsSpec := osSecretsResource.TypedSpec()
kubeconfig, err := clientcmd.BuildConfigFromKubeconfigGetter("", func() (*clientcmdapi.Config, error) {
return clientcmd.Load([]byte(kubeSecretsSpec.LocalhostAdminKubeconfig))
})
if err != nil {
return fmt.Errorf("error loading kubeconfig: %w", err)
}
stopCRDController()
var crdControllerCtx context.Context
crdControllerCtx, crdControllerCtxCancel = context.WithCancel(ctx) //nolint:govet
go func() {
crdControllerErrCh <- ctrl.runCRDController(
crdControllerCtx,
osSecretsSpec.IssuingCA,
kubeconfig,
kubeaccessConfigSpec,
logger,
)
}()
r.ResetRestartBackoff()
}
}
func (ctrl *CRDController) runCRDController(
ctx context.Context,
talosCA *x509.PEMEncodedCertificateAndKey,
kubeconfig *rest.Config,
kubeaccessCfgSpec *kubeaccess.ConfigSpec,
logger *zap.Logger,
) error {
return etcd.WithLock(ctx, constants.EtcdTalosServiceAccountCRDControllerMutex, logger, func() error {
crdCtrl, err := serviceaccount.NewCRDController(
talosCA,
kubeconfig,
kubeaccessCfgSpec.AllowedKubernetesNamespaces,
kubeaccessCfgSpec.AllowedAPIRoles,
logger,
)
if err != nil {
return err
}
return crdCtrl.Run(ctx, 1)
})
}