/* 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/apiserver/pkg/authentication/authenticator" "k8s.io/apiserver/pkg/authorization/authorizer" 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/apimachinery/pkg/types" "k8s.io/kubernetes/pkg/apis/componentconfig" apiserverauthenticator "k8s.io/kubernetes/pkg/genericapiserver/authenticator" alwaysallowauthorizer "k8s.io/kubernetes/pkg/genericapiserver/authorizer" apiserverauthorizer "k8s.io/kubernetes/pkg/genericapiserver/authorizer" "k8s.io/kubernetes/pkg/kubelet/server" ) func buildAuth(nodeName types.NodeName, client clientset.Interface, config componentconfig.KubeletConfiguration) (server.AuthInterface, error) { // Get clients, if provided var ( tokenClient authenticationclient.TokenReviewInterface sarClient authorizationclient.SubjectAccessReviewInterface ) if client != nil && !reflect.ValueOf(client).IsNil() { tokenClient = client.Authentication().TokenReviews() sarClient = client.Authorization().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 } func buildAuthn(client authenticationclient.TokenReviewInterface, authn componentconfig.KubeletAuthentication) (authenticator.Request, error) { authenticatorConfig := apiserverauthenticator.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 } func buildAuthz(client authorizationclient.SubjectAccessReviewInterface, authz componentconfig.KubeletAuthorization) (authorizer.Authorizer, error) { switch authz.Mode { case componentconfig.KubeletAuthorizationModeAlwaysAllow: return alwaysallowauthorizer.NewAlwaysAllowAuthorizer(), nil case componentconfig.KubeletAuthorizationModeWebhook: if client == nil { return nil, errors.New("no client provided, cannot use webhook authorization") } authorizerConfig := apiserverauthorizer.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) } }