mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-10 16:30:19 +00:00
242 lines
8.6 KiB
Go
242 lines
8.6 KiB
Go
/*
|
|
Copyright 2016 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package controller
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"time"
|
|
|
|
v1authenticationapi "k8s.io/api/authentication/v1"
|
|
v1 "k8s.io/api/core/v1"
|
|
apierrors "k8s.io/apimachinery/pkg/api/errors"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apimachinery/pkg/fields"
|
|
"k8s.io/apimachinery/pkg/runtime"
|
|
"k8s.io/apimachinery/pkg/watch"
|
|
apiserverserviceaccount "k8s.io/apiserver/pkg/authentication/serviceaccount"
|
|
clientset "k8s.io/client-go/kubernetes"
|
|
v1authentication "k8s.io/client-go/kubernetes/typed/authentication/v1"
|
|
v1core "k8s.io/client-go/kubernetes/typed/core/v1"
|
|
restclient "k8s.io/client-go/rest"
|
|
"k8s.io/client-go/tools/cache"
|
|
watchtools "k8s.io/client-go/tools/watch"
|
|
"k8s.io/klog"
|
|
"k8s.io/kubernetes/pkg/api/legacyscheme"
|
|
api "k8s.io/kubernetes/pkg/apis/core"
|
|
"k8s.io/kubernetes/pkg/serviceaccount"
|
|
)
|
|
|
|
// ControllerClientBuilder allows you to get clients and configs for controllers
|
|
// Please note a copy also exists in staging/src/k8s.io/cloud-provider/cloud.go
|
|
// TODO: Extract this into a separate controller utilities repo (issues/68947)
|
|
type ControllerClientBuilder interface {
|
|
Config(name string) (*restclient.Config, error)
|
|
ConfigOrDie(name string) *restclient.Config
|
|
Client(name string) (clientset.Interface, error)
|
|
ClientOrDie(name string) clientset.Interface
|
|
}
|
|
|
|
// SimpleControllerClientBuilder returns a fixed client with different user agents
|
|
type SimpleControllerClientBuilder struct {
|
|
// ClientConfig is a skeleton config to clone and use as the basis for each controller client
|
|
ClientConfig *restclient.Config
|
|
}
|
|
|
|
func (b SimpleControllerClientBuilder) Config(name string) (*restclient.Config, error) {
|
|
clientConfig := *b.ClientConfig
|
|
return restclient.AddUserAgent(&clientConfig, name), nil
|
|
}
|
|
|
|
func (b SimpleControllerClientBuilder) ConfigOrDie(name string) *restclient.Config {
|
|
clientConfig, err := b.Config(name)
|
|
if err != nil {
|
|
klog.Fatal(err)
|
|
}
|
|
return clientConfig
|
|
}
|
|
|
|
func (b SimpleControllerClientBuilder) Client(name string) (clientset.Interface, error) {
|
|
clientConfig, err := b.Config(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return clientset.NewForConfig(clientConfig)
|
|
}
|
|
|
|
func (b SimpleControllerClientBuilder) ClientOrDie(name string) clientset.Interface {
|
|
client, err := b.Client(name)
|
|
if err != nil {
|
|
klog.Fatal(err)
|
|
}
|
|
return client
|
|
}
|
|
|
|
// SAControllerClientBuilder is a ControllerClientBuilder that returns clients identifying as
|
|
// service accounts
|
|
type SAControllerClientBuilder struct {
|
|
// ClientConfig is a skeleton config to clone and use as the basis for each controller client
|
|
ClientConfig *restclient.Config
|
|
|
|
// CoreClient is used to provision service accounts if needed and watch for their associated tokens
|
|
// to construct a controller client
|
|
CoreClient v1core.CoreV1Interface
|
|
|
|
// AuthenticationClient is used to check API tokens to make sure they are valid before
|
|
// building a controller client from them
|
|
AuthenticationClient v1authentication.AuthenticationV1Interface
|
|
|
|
// Namespace is the namespace used to host the service accounts that will back the
|
|
// controllers. It must be highly privileged namespace which normal users cannot inspect.
|
|
Namespace string
|
|
}
|
|
|
|
// config returns a complete clientConfig for constructing clients. This is separate in anticipation of composition
|
|
// which means that not all clientsets are known here
|
|
func (b SAControllerClientBuilder) Config(name string) (*restclient.Config, error) {
|
|
sa, err := getOrCreateServiceAccount(b.CoreClient, b.Namespace, name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var clientConfig *restclient.Config
|
|
fieldSelector := fields.SelectorFromSet(map[string]string{
|
|
api.SecretTypeField: string(v1.SecretTypeServiceAccountToken),
|
|
}).String()
|
|
lw := &cache.ListWatch{
|
|
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
|
|
options.FieldSelector = fieldSelector
|
|
return b.CoreClient.Secrets(b.Namespace).List(context.TODO(), options)
|
|
},
|
|
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
|
|
options.FieldSelector = fieldSelector
|
|
return b.CoreClient.Secrets(b.Namespace).Watch(context.TODO(), options)
|
|
},
|
|
}
|
|
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
|
|
defer cancel()
|
|
_, err = watchtools.UntilWithSync(ctx, lw, &v1.Secret{}, nil,
|
|
func(event watch.Event) (bool, error) {
|
|
switch event.Type {
|
|
case watch.Deleted:
|
|
return false, nil
|
|
case watch.Error:
|
|
return false, fmt.Errorf("error watching")
|
|
|
|
case watch.Added, watch.Modified:
|
|
secret, ok := event.Object.(*v1.Secret)
|
|
if !ok {
|
|
return false, fmt.Errorf("unexpected object type: %T", event.Object)
|
|
}
|
|
if !serviceaccount.IsServiceAccountToken(secret, sa) {
|
|
return false, nil
|
|
}
|
|
if len(secret.Data[v1.ServiceAccountTokenKey]) == 0 {
|
|
return false, nil
|
|
}
|
|
validConfig, valid, err := b.getAuthenticatedConfig(sa, string(secret.Data[v1.ServiceAccountTokenKey]))
|
|
if err != nil {
|
|
klog.Warningf("error validating API token for %s/%s in secret %s: %v", sa.Namespace, sa.Name, secret.Name, err)
|
|
// continue watching for good tokens
|
|
return false, nil
|
|
}
|
|
if !valid {
|
|
klog.Warningf("secret %s contained an invalid API token for %s/%s", secret.Name, sa.Namespace, sa.Name)
|
|
// try to delete the secret containing the invalid token
|
|
if err := b.CoreClient.Secrets(secret.Namespace).Delete(context.TODO(), secret.Name, metav1.DeleteOptions{}); err != nil && !apierrors.IsNotFound(err) {
|
|
klog.Warningf("error deleting secret %s containing invalid API token for %s/%s: %v", secret.Name, sa.Namespace, sa.Name, err)
|
|
}
|
|
// continue watching for good tokens
|
|
return false, nil
|
|
}
|
|
clientConfig = validConfig
|
|
return true, nil
|
|
|
|
default:
|
|
return false, fmt.Errorf("unexpected event type: %v", event.Type)
|
|
}
|
|
})
|
|
if err != nil {
|
|
return nil, fmt.Errorf("unable to get token for service account: %v", err)
|
|
}
|
|
|
|
return clientConfig, nil
|
|
}
|
|
|
|
func (b SAControllerClientBuilder) getAuthenticatedConfig(sa *v1.ServiceAccount, token string) (*restclient.Config, bool, error) {
|
|
username := apiserverserviceaccount.MakeUsername(sa.Namespace, sa.Name)
|
|
|
|
clientConfig := restclient.AnonymousClientConfig(b.ClientConfig)
|
|
clientConfig.BearerToken = token
|
|
restclient.AddUserAgent(clientConfig, username)
|
|
|
|
// Try token review first
|
|
tokenReview := &v1authenticationapi.TokenReview{Spec: v1authenticationapi.TokenReviewSpec{Token: token}}
|
|
if tokenResult, err := b.AuthenticationClient.TokenReviews().Create(context.TODO(), tokenReview, metav1.CreateOptions{}); err == nil {
|
|
if !tokenResult.Status.Authenticated {
|
|
klog.Warningf("Token for %s/%s did not authenticate correctly", sa.Namespace, sa.Name)
|
|
return nil, false, nil
|
|
}
|
|
if tokenResult.Status.User.Username != username {
|
|
klog.Warningf("Token for %s/%s authenticated as unexpected username: %s", sa.Namespace, sa.Name, tokenResult.Status.User.Username)
|
|
return nil, false, nil
|
|
}
|
|
klog.V(4).Infof("Verified credential for %s/%s", sa.Namespace, sa.Name)
|
|
return clientConfig, true, nil
|
|
}
|
|
|
|
// If we couldn't run the token review, the API might be disabled or we might not have permission.
|
|
// Try to make a request to /apis with the token. If we get a 401 we should consider the token invalid.
|
|
clientConfigCopy := *clientConfig
|
|
clientConfigCopy.NegotiatedSerializer = legacyscheme.Codecs
|
|
client, err := restclient.UnversionedRESTClientFor(&clientConfigCopy)
|
|
if err != nil {
|
|
return nil, false, err
|
|
}
|
|
err = client.Get().AbsPath("/apis").Do(context.TODO()).Error()
|
|
if apierrors.IsUnauthorized(err) {
|
|
klog.Warningf("Token for %s/%s did not authenticate correctly: %v", sa.Namespace, sa.Name, err)
|
|
return nil, false, nil
|
|
}
|
|
|
|
return clientConfig, true, nil
|
|
}
|
|
|
|
func (b SAControllerClientBuilder) ConfigOrDie(name string) *restclient.Config {
|
|
clientConfig, err := b.Config(name)
|
|
if err != nil {
|
|
klog.Fatal(err)
|
|
}
|
|
return clientConfig
|
|
}
|
|
|
|
func (b SAControllerClientBuilder) Client(name string) (clientset.Interface, error) {
|
|
clientConfig, err := b.Config(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return clientset.NewForConfig(clientConfig)
|
|
}
|
|
|
|
func (b SAControllerClientBuilder) ClientOrDie(name string) clientset.Interface {
|
|
client, err := b.Client(name)
|
|
if err != nil {
|
|
klog.Fatal(err)
|
|
}
|
|
return client
|
|
}
|