130 lines
4.4 KiB
Go
130 lines
4.4 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package webhook implements the authenticator.Token interface using HTTP webhooks.
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package webhook
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import (
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"time"
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"k8s.io/kubernetes/pkg/api/unversioned"
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_ "k8s.io/kubernetes/pkg/apis/authentication/install"
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authentication "k8s.io/kubernetes/pkg/apis/authentication/v1beta1"
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"k8s.io/kubernetes/pkg/auth/authenticator"
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"k8s.io/kubernetes/pkg/auth/user"
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authenticationclient "k8s.io/kubernetes/pkg/client/clientset_generated/release_1_5/typed/authentication/v1beta1"
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"k8s.io/kubernetes/pkg/util/cache"
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"k8s.io/kubernetes/plugin/pkg/webhook"
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)
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var (
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groupVersions = []unversioned.GroupVersion{authentication.SchemeGroupVersion}
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)
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const retryBackoff = 500 * time.Millisecond
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// Ensure WebhookTokenAuthenticator implements the authenticator.Token interface.
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var _ authenticator.Token = (*WebhookTokenAuthenticator)(nil)
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type WebhookTokenAuthenticator struct {
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tokenReview authenticationclient.TokenReviewInterface
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responseCache *cache.LRUExpireCache
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ttl time.Duration
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initialBackoff time.Duration
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}
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// NewFromInterface creates a webhook authenticator using the given tokenReview client
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func NewFromInterface(tokenReview authenticationclient.TokenReviewInterface, ttl time.Duration) (*WebhookTokenAuthenticator, error) {
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return newWithBackoff(tokenReview, ttl, retryBackoff)
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}
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// New creates a new WebhookTokenAuthenticator from the provided kubeconfig file.
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func New(kubeConfigFile string, ttl time.Duration) (*WebhookTokenAuthenticator, error) {
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tokenReview, err := tokenReviewInterfaceFromKubeconfig(kubeConfigFile)
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if err != nil {
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return nil, err
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}
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return newWithBackoff(tokenReview, ttl, retryBackoff)
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}
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// newWithBackoff allows tests to skip the sleep.
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func newWithBackoff(tokenReview authenticationclient.TokenReviewInterface, ttl, initialBackoff time.Duration) (*WebhookTokenAuthenticator, error) {
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return &WebhookTokenAuthenticator{tokenReview, cache.NewLRUExpireCache(1024), ttl, initialBackoff}, nil
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}
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// AuthenticateToken implements the authenticator.Token interface.
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func (w *WebhookTokenAuthenticator) AuthenticateToken(token string) (user.Info, bool, error) {
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r := &authentication.TokenReview{
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Spec: authentication.TokenReviewSpec{Token: token},
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}
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if entry, ok := w.responseCache.Get(r.Spec); ok {
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r.Status = entry.(authentication.TokenReviewStatus)
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} else {
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var (
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result *authentication.TokenReview
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err error
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)
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webhook.WithExponentialBackoff(w.initialBackoff, func() error {
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result, err = w.tokenReview.Create(r)
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return err
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})
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if err != nil {
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return nil, false, err
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}
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r.Status = result.Status
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w.responseCache.Add(r.Spec, result.Status, w.ttl)
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}
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if !r.Status.Authenticated {
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return nil, false, nil
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}
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var extra map[string][]string
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if r.Status.User.Extra != nil {
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extra = map[string][]string{}
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for k, v := range r.Status.User.Extra {
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extra[k] = v
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}
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}
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return &user.DefaultInfo{
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Name: r.Status.User.Username,
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UID: r.Status.User.UID,
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Groups: r.Status.User.Groups,
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Extra: extra,
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}, true, nil
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}
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// tokenReviewInterfaceFromKubeconfig builds a client from the specified kubeconfig file,
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// and returns a TokenReviewInterface that uses that client. Note that the client submits TokenReview
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// requests to the exact path specified in the kubeconfig file, so arbitrary non-API servers can be targeted.
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func tokenReviewInterfaceFromKubeconfig(kubeConfigFile string) (authenticationclient.TokenReviewInterface, error) {
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gw, err := webhook.NewGenericWebhook(kubeConfigFile, groupVersions, 0)
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if err != nil {
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return nil, err
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}
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return &tokenReviewClient{gw}, nil
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}
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type tokenReviewClient struct {
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w *webhook.GenericWebhook
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}
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func (t *tokenReviewClient) Create(tokenReview *authentication.TokenReview) (*authentication.TokenReview, error) {
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result := &authentication.TokenReview{}
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err := t.w.RestClient.Post().Body(tokenReview).Do().Into(result)
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return result, err
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}
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