vendor files

vendor/k8s.io/kubernetes/cmd/kubelet/app/auth.go

@@ -0,0 +1,107 @@
+/*
+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 app
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+	"k8s.io/apiserver/pkg/authentication/authenticatorfactory"
+	"k8s.io/apiserver/pkg/authorization/authorizer"
+	"k8s.io/apiserver/pkg/authorization/authorizerfactory"
+	clientset "k8s.io/client-go/kubernetes"
+	authenticationclient "k8s.io/client-go/kubernetes/typed/authentication/v1beta1"
+	authorizationclient "k8s.io/client-go/kubernetes/typed/authorization/v1beta1"
+
+	"k8s.io/kubernetes/pkg/kubelet/apis/kubeletconfig"
+	"k8s.io/kubernetes/pkg/kubelet/server"
+)
+
+// BuildAuth creates an authenticator, an authorizer, and a matching authorizer attributes getter compatible with the kubelet's needs
+func BuildAuth(nodeName types.NodeName, client clientset.Interface, config kubeletconfig.KubeletConfiguration) (server.AuthInterface, error) {
+	// Get clients, if provided
+	var (
+		tokenClient authenticationclient.TokenReviewInterface
+		sarClient   authorizationclient.SubjectAccessReviewInterface
+	)
+	if client != nil && !reflect.ValueOf(client).IsNil() {
+		tokenClient = client.AuthenticationV1beta1().TokenReviews()
+		sarClient = client.AuthorizationV1beta1().SubjectAccessReviews()
+	}
+
+	authenticator, err := BuildAuthn(tokenClient, config.Authentication)
+	if err != nil {
+		return nil, err
+	}
+
+	attributes := server.NewNodeAuthorizerAttributesGetter(nodeName)
+
+	authorizer, err := BuildAuthz(sarClient, config.Authorization)
+	if err != nil {
+		return nil, err
+	}
+
+	return server.NewKubeletAuth(authenticator, attributes, authorizer), nil
+}
+
+// BuildAuthn creates an authenticator compatible with the kubelet's needs
+func BuildAuthn(client authenticationclient.TokenReviewInterface, authn kubeletconfig.KubeletAuthentication) (authenticator.Request, error) {
+	authenticatorConfig := authenticatorfactory.DelegatingAuthenticatorConfig{
+		Anonymous:    authn.Anonymous.Enabled,
+		CacheTTL:     authn.Webhook.CacheTTL.Duration,
+		ClientCAFile: authn.X509.ClientCAFile,
+	}
+
+	if authn.Webhook.Enabled {
+		if client == nil {
+			return nil, errors.New("no client provided, cannot use webhook authentication")
+		}
+		authenticatorConfig.TokenAccessReviewClient = client
+	}
+
+	authenticator, _, err := authenticatorConfig.New()
+	return authenticator, err
+}
+
+// BuildAuthz creates an authorizer compatible with the kubelet's needs
+func BuildAuthz(client authorizationclient.SubjectAccessReviewInterface, authz kubeletconfig.KubeletAuthorization) (authorizer.Authorizer, error) {
+	switch authz.Mode {
+	case kubeletconfig.KubeletAuthorizationModeAlwaysAllow:
+		return authorizerfactory.NewAlwaysAllowAuthorizer(), nil
+
+	case kubeletconfig.KubeletAuthorizationModeWebhook:
+		if client == nil {
+			return nil, errors.New("no client provided, cannot use webhook authorization")
+		}
+		authorizerConfig := authorizerfactory.DelegatingAuthorizerConfig{
+			SubjectAccessReviewClient: client,
+			AllowCacheTTL:             authz.Webhook.CacheAuthorizedTTL.Duration,
+			DenyCacheTTL:              authz.Webhook.CacheUnauthorizedTTL.Duration,
+		}
+		return authorizerConfig.New()
+
+	case "":
+		return nil, fmt.Errorf("No authorization mode specified")
+
+	default:
+		return nil, fmt.Errorf("Unknown authorization mode %s", authz.Mode)
+
+	}
+}