mirror of
https://github.com/k3s-io/kubernetes.git
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108 lines
3.7 KiB
Go
108 lines
3.7 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 app
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import (
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"errors"
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"fmt"
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"reflect"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apiserver/pkg/authentication/authenticator"
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"k8s.io/apiserver/pkg/authentication/authenticatorfactory"
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"k8s.io/apiserver/pkg/authorization/authorizer"
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"k8s.io/apiserver/pkg/authorization/authorizerfactory"
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clientset "k8s.io/client-go/kubernetes"
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authenticationclient "k8s.io/client-go/kubernetes/typed/authentication/v1beta1"
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authorizationclient "k8s.io/client-go/kubernetes/typed/authorization/v1beta1"
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"k8s.io/kubernetes/pkg/apis/componentconfig"
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"k8s.io/kubernetes/pkg/kubelet/server"
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)
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// BuildAuth creates an authenticator, an authorizer, and a matching authorizer attributes getter compatible with the kubelet's needs
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func BuildAuth(nodeName types.NodeName, client clientset.Interface, config componentconfig.KubeletConfiguration) (server.AuthInterface, error) {
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// Get clients, if provided
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var (
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tokenClient authenticationclient.TokenReviewInterface
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sarClient authorizationclient.SubjectAccessReviewInterface
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)
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if client != nil && !reflect.ValueOf(client).IsNil() {
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tokenClient = client.AuthenticationV1beta1().TokenReviews()
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sarClient = client.AuthorizationV1beta1().SubjectAccessReviews()
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}
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authenticator, err := BuildAuthn(tokenClient, config.Authentication)
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if err != nil {
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return nil, err
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}
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attributes := server.NewNodeAuthorizerAttributesGetter(nodeName)
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authorizer, err := BuildAuthz(sarClient, config.Authorization)
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if err != nil {
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return nil, err
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}
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return server.NewKubeletAuth(authenticator, attributes, authorizer), nil
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}
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// BuildAuthn creates an authenticator compatible with the kubelet's needs
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func BuildAuthn(client authenticationclient.TokenReviewInterface, authn componentconfig.KubeletAuthentication) (authenticator.Request, error) {
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authenticatorConfig := authenticatorfactory.DelegatingAuthenticatorConfig{
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Anonymous: authn.Anonymous.Enabled,
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CacheTTL: authn.Webhook.CacheTTL.Duration,
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ClientCAFile: authn.X509.ClientCAFile,
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}
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if authn.Webhook.Enabled {
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if client == nil {
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return nil, errors.New("no client provided, cannot use webhook authentication")
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}
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authenticatorConfig.TokenAccessReviewClient = client
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}
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authenticator, _, err := authenticatorConfig.New()
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return authenticator, err
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}
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// BuildAuthz creates an authorizer compatible with the kubelet's needs
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func BuildAuthz(client authorizationclient.SubjectAccessReviewInterface, authz componentconfig.KubeletAuthorization) (authorizer.Authorizer, error) {
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switch authz.Mode {
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case componentconfig.KubeletAuthorizationModeAlwaysAllow:
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return authorizerfactory.NewAlwaysAllowAuthorizer(), nil
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case componentconfig.KubeletAuthorizationModeWebhook:
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if client == nil {
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return nil, errors.New("no client provided, cannot use webhook authorization")
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}
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authorizerConfig := authorizerfactory.DelegatingAuthorizerConfig{
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SubjectAccessReviewClient: client,
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AllowCacheTTL: authz.Webhook.CacheAuthorizedTTL.Duration,
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DenyCacheTTL: authz.Webhook.CacheUnauthorizedTTL.Duration,
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}
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return authorizerConfig.New()
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case "":
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return nil, fmt.Errorf("No authorization mode specified")
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default:
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return nil, fmt.Errorf("Unknown authorization mode %s", authz.Mode)
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}
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}
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