/
config.go
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/
config.go
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/*
* Tencent is pleased to support the open source community by making TKEStack
* available.
*
* Copyright (C) 2012-2019 Tencent. All Rights Reserved.
*
* 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
*
* https://opensource.org/licenses/Apache-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 OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package authorization
import (
"fmt"
"time"
"tkestack.io/tke/pkg/apiserver/authorization/modes"
"k8s.io/apiserver/pkg/authorization/authorizer"
"k8s.io/apiserver/pkg/authorization/authorizerfactory"
"k8s.io/apiserver/pkg/authorization/union"
"k8s.io/apiserver/plugin/pkg/authorizer/webhook"
)
// Config contains the data on how to authorize a request to the Kube API Server
type Config struct {
AuthorizationModes []string
// Options for ModeWebhook
// file for Webhook authorization plugin.
WebhookConfigFile string
WebhookVersion string
// TTL for caching of authorized responses from the webhook server.
WebhookCacheAuthorizedTTL time.Duration
// TTL for caching of unauthorized responses from the webhook server.
WebhookCacheUnauthorizedTTL time.Duration
}
// New returns the right sort of union of multiple authorizer.Authorizer objects
// based on the authorizationMode or an error.
func (config Config) New() (authorizer.Authorizer, authorizer.RuleResolver, error) {
if len(config.AuthorizationModes) == 0 {
return nil, nil, fmt.Errorf("at least one authorization mode must be passed")
}
var (
authorizers []authorizer.Authorizer
ruleResolvers []authorizer.RuleResolver
)
for _, authorizationMode := range config.AuthorizationModes {
// Keep cases in sync with constant list in k8s.io/kubernetes/pkg/kubeapiserver/authorizer/modes/modes.go.
switch authorizationMode {
case modes.ModeAlwaysAllow:
alwaysAllowAuthorizer := authorizerfactory.NewAlwaysAllowAuthorizer()
authorizers = append(authorizers, alwaysAllowAuthorizer)
ruleResolvers = append(ruleResolvers, alwaysAllowAuthorizer)
case modes.ModeAlwaysDeny:
alwaysDenyAuthorizer := authorizerfactory.NewAlwaysDenyAuthorizer()
authorizers = append(authorizers, alwaysDenyAuthorizer)
ruleResolvers = append(ruleResolvers, alwaysDenyAuthorizer)
case modes.ModeWebhook:
webhookAuthorizer, err := webhook.New(config.WebhookConfigFile,
config.WebhookVersion,
config.WebhookCacheAuthorizedTTL,
config.WebhookCacheUnauthorizedTTL,
*webhook.DefaultRetryBackoff(), nil)
if err != nil {
return nil, nil, err
}
authorizers = append(authorizers, webhookAuthorizer)
ruleResolvers = append(ruleResolvers, webhookAuthorizer)
default:
return nil, nil, fmt.Errorf("unknown authorization mode %s specified", authorizationMode)
}
}
return union.New(authorizers...), union.NewRuleResolvers(ruleResolvers...), nil
}