/
audit.go
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/
audit.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 util
import (
"fmt"
"io"
"os"
"gopkg.in/natefinch/lumberjack.v2"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apiserver/pkg/audit"
"k8s.io/apiserver/pkg/audit/policy"
genericapiserver "k8s.io/apiserver/pkg/server"
apiserveroptions "k8s.io/apiserver/pkg/server/options"
genericapiserveroptions "k8s.io/apiserver/pkg/server/options"
pluginbuffered "k8s.io/apiserver/plugin/pkg/audit/buffered"
pluginlog "k8s.io/apiserver/plugin/pkg/audit/log"
plugintruncate "k8s.io/apiserver/plugin/pkg/audit/truncate"
pluginwebhook "k8s.io/apiserver/plugin/pkg/audit/webhook"
)
func SetupAuditConfig(genericAPIServerConfig *genericapiserver.Config, auditOptions *genericapiserveroptions.AuditOptions) error {
if auditOptions.PolicyFile != "" {
p, err := policy.LoadPolicyFromFile(auditOptions.PolicyFile)
if err != nil {
return fmt.Errorf("loading audit policy file: %v", err)
}
checker := policy.NewChecker(p)
logBackend := buildLogAuditBackend(auditOptions.LogOptions)
webhookBackend, err := buildWebhookAuditBackend(auditOptions.WebhookOptions)
if err != nil {
return err
}
backend := logBackend
if backend == nil && webhookBackend != nil {
backend = webhookBackend
} else if webhookBackend != nil {
backend = audit.Union(backend, webhookBackend)
}
genericAPIServerConfig.AuditBackend = backend
genericAPIServerConfig.AuditPolicyChecker = checker
}
return nil
}
func buildLogAuditBackend(o apiserveroptions.AuditLogOptions) audit.Backend {
if o.Path == "" {
return nil
}
var w io.Writer = os.Stdout
if o.Path != "-" {
w = &lumberjack.Logger{
Filename: o.Path,
MaxAge: o.MaxAge,
MaxBackups: o.MaxBackups,
MaxSize: o.MaxSize,
}
}
groupVersion, _ := schema.ParseGroupVersion(o.GroupVersionString)
logBackend := pluginlog.NewBackend(w, o.Format, groupVersion)
logBackend = pluginbuffered.NewBackend(logBackend, o.BatchOptions.BatchConfig)
return logBackend
}
func buildWebhookAuditBackend(o apiserveroptions.AuditWebhookOptions) (audit.Backend, error) {
if o.ConfigFile == "" {
return nil, nil
}
groupVersion, _ := schema.ParseGroupVersion(o.GroupVersionString)
webhook, err := pluginwebhook.NewBackend(o.ConfigFile, groupVersion, wait.Backoff{
Steps: 5,
Duration: o.InitialBackoff,
Factor: 1.0,
Jitter: 0.1,
}, nil)
if err != nil {
return nil, fmt.Errorf("initializing audit webhook: %v", err)
}
webhook = pluginbuffered.NewBackend(webhook, o.BatchOptions.BatchConfig)
if o.TruncateOptions.Enabled {
webhook = plugintruncate.NewBackend(webhook, o.TruncateOptions.TruncateConfig, groupVersion)
}
return webhook, nil
}