97 lines
3.0 KiB
Go
97 lines
3.0 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 webhook implements the authenticator.Token interface using HTTP webhooks.
|
|
package webhook
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"k8s.io/kubernetes/pkg/api/unversioned"
|
|
"k8s.io/kubernetes/pkg/apis/authentication/v1beta1"
|
|
"k8s.io/kubernetes/pkg/auth/authenticator"
|
|
"k8s.io/kubernetes/pkg/auth/user"
|
|
"k8s.io/kubernetes/pkg/client/restclient"
|
|
"k8s.io/kubernetes/pkg/util/cache"
|
|
"k8s.io/kubernetes/plugin/pkg/webhook"
|
|
|
|
_ "k8s.io/kubernetes/pkg/apis/authentication/install"
|
|
)
|
|
|
|
var (
|
|
groupVersions = []unversioned.GroupVersion{v1beta1.SchemeGroupVersion}
|
|
)
|
|
|
|
const retryBackoff = 500 * time.Millisecond
|
|
|
|
// Ensure WebhookTokenAuthenticator implements the authenticator.Token interface.
|
|
var _ authenticator.Token = (*WebhookTokenAuthenticator)(nil)
|
|
|
|
type WebhookTokenAuthenticator struct {
|
|
*webhook.GenericWebhook
|
|
responseCache *cache.LRUExpireCache
|
|
ttl time.Duration
|
|
}
|
|
|
|
// New creates a new WebhookTokenAuthenticator from the provided kubeconfig file.
|
|
func New(kubeConfigFile string, ttl time.Duration) (*WebhookTokenAuthenticator, error) {
|
|
return newWithBackoff(kubeConfigFile, ttl, retryBackoff)
|
|
}
|
|
|
|
// newWithBackoff allows tests to skip the sleep.
|
|
func newWithBackoff(kubeConfigFile string, ttl, initialBackoff time.Duration) (*WebhookTokenAuthenticator, error) {
|
|
gw, err := webhook.NewGenericWebhook(kubeConfigFile, groupVersions, initialBackoff)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &WebhookTokenAuthenticator{gw, cache.NewLRUExpireCache(1024), ttl}, nil
|
|
}
|
|
|
|
// AuthenticateToken implements the authenticator.Token interface.
|
|
func (w *WebhookTokenAuthenticator) AuthenticateToken(token string) (user.Info, bool, error) {
|
|
r := &v1beta1.TokenReview{
|
|
Spec: v1beta1.TokenReviewSpec{Token: token},
|
|
}
|
|
if entry, ok := w.responseCache.Get(r.Spec); ok {
|
|
r.Status = entry.(v1beta1.TokenReviewStatus)
|
|
} else {
|
|
result := w.WithExponentialBackoff(func() restclient.Result {
|
|
return w.RestClient.Post().Body(r).Do()
|
|
})
|
|
if err := result.Error(); err != nil {
|
|
return nil, false, err
|
|
}
|
|
var statusCode int
|
|
if result.StatusCode(&statusCode); statusCode < 200 || statusCode >= 300 {
|
|
return nil, false, fmt.Errorf("Error contacting webhook: %d", statusCode)
|
|
}
|
|
spec := r.Spec
|
|
if err := result.Into(r); err != nil {
|
|
return nil, false, err
|
|
}
|
|
w.responseCache.Add(spec, r.Status, w.ttl)
|
|
}
|
|
if !r.Status.Authenticated {
|
|
return nil, false, nil
|
|
}
|
|
return &user.DefaultInfo{
|
|
Name: r.Status.User.Username,
|
|
UID: r.Status.User.UID,
|
|
Groups: r.Status.User.Groups,
|
|
}, true, nil
|
|
}
|