mutating_webhook.go•5.3 kB
/*
Copyright 2023 The K8sGPT 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 analyzer
import (
"fmt"
"github.com/weibaohui/k8m/pkg/k8sgpt/common"
"github.com/weibaohui/k8m/pkg/k8sgpt/kubernetes"
"github.com/weibaohui/k8m/pkg/k8sgpt/util"
"github.com/weibaohui/kom/kom"
admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
)
type MutatingWebhookAnalyzer struct{}
func (MutatingWebhookAnalyzer) Analyze(a common.Analyzer) ([]common.Result, error) {
kind := "MutatingWebhookConfiguration"
apiDoc := kubernetes.K8sApiReference{
Kind: kind,
ApiVersion: schema.GroupVersion{
Group: "apps",
Version: "v1",
},
OpenapiSchema: a.OpenapiSchema,
}
AnalyzerErrorsMetric.DeletePartialMatch(map[string]string{
"analyzer_name": kind,
})
var mutatingWebhooks []*admissionregistrationv1.MutatingWebhookConfiguration
err := kom.Cluster(a.ClusterID).WithContext(a.Context).Resource(&admissionregistrationv1.MutatingWebhookConfiguration{}).WithLabelSelector(a.LabelSelector).List(&mutatingWebhooks).Error
if err != nil {
return nil, err
}
var preAnalysis = map[string]common.PreAnalysis{}
for _, webhookConfig := range mutatingWebhooks {
for _, webhook := range webhookConfig.Webhooks {
var failures []common.Failure
if webhook.ClientConfig.Service == nil {
continue
}
svc := webhook.ClientConfig.Service
// Get the service
var service *corev1.Service
err = kom.Cluster(a.ClusterID).WithContext(a.Context).Resource(&corev1.Service{}).Namespace(svc.Namespace).Name(svc.Name).Get(&service).Error
if err != nil {
// If the service is not found, we can't check the pods
failures = append(failures, common.Failure{
Text: fmt.Sprintf("Service %s not found as mapped to by Mutating Webhook %s", svc.Name, webhook.Name),
KubernetesDoc: apiDoc.GetApiDocV2("spec.webhook.clientConfig.service"),
Sensitive: []common.Sensitive{
{
Unmasked: webhookConfig.Namespace,
Masked: util.MaskString(webhookConfig.Namespace),
},
{
Unmasked: svc.Name,
Masked: util.MaskString(svc.Name),
},
},
})
preAnalysis[fmt.Sprintf("%s/%s", webhookConfig.Namespace, webhook.Name)] = common.PreAnalysis{
MutatingWebhook: *webhookConfig,
FailureDetails: failures,
}
AnalyzerErrorsMetric.WithLabelValues(kind, webhook.Name, webhookConfig.Namespace).Set(float64(len(failures)))
continue
}
// When Service selectors are empty we defer to service analyser
if len(service.Spec.Selector) == 0 {
continue
}
// Get pods within service
var pods []*corev1.Pod
err = kom.Cluster(a.ClusterID).WithContext(a.Context).Resource(&corev1.Pod{}).WithLabelSelector(util.MapToString(service.Spec.Selector)).Namespace(svc.Namespace).List(&pods).Error
if err != nil {
return nil, err
}
if len(pods) == 0 {
failures = append(failures, common.Failure{
Text: fmt.Sprintf("No active pods found within service %s as mapped to by Mutating Webhook %s", svc.Name, webhook.Name),
KubernetesDoc: apiDoc.GetApiDocV2("spec.webhook.clientConfig.service"),
Sensitive: []common.Sensitive{
{
Unmasked: webhookConfig.Namespace,
Masked: util.MaskString(webhookConfig.Namespace),
},
},
})
}
for _, pod := range pods {
if pod.Status.Phase != "Running" {
doc := apiDoc.GetApiDocV2("spec.webhook")
failures = append(failures, common.Failure{
Text: fmt.Sprintf(
"Mutating Webhook (%s) is pointing to an inactive receiver pod (%s)",
webhook.Name,
pod.Name,
),
KubernetesDoc: doc,
Sensitive: []common.Sensitive{
{
Unmasked: webhookConfig.Namespace,
Masked: util.MaskString(webhookConfig.Namespace),
},
{
Unmasked: webhook.Name,
Masked: util.MaskString(webhook.Name),
},
{
Unmasked: pod.Name,
Masked: util.MaskString(pod.Name),
},
},
})
}
}
if len(failures) > 0 {
preAnalysis[fmt.Sprintf("%s/%s", webhookConfig.Namespace, webhook.Name)] = common.PreAnalysis{
MutatingWebhook: *webhookConfig,
FailureDetails: failures,
}
AnalyzerErrorsMetric.WithLabelValues(kind, webhook.Name, webhookConfig.Namespace).Set(float64(len(failures)))
}
}
}
for key, value := range preAnalysis {
var currentAnalysis = common.Result{
Kind: kind,
Name: key,
Error: value.FailureDetails,
}
parent, found := util.GetParent(a.Context, a.ClusterID, value.MutatingWebhook.ObjectMeta)
if found {
currentAnalysis.ParentObject = parent
}
a.Results = append(a.Results, currentAnalysis)
}
return a.Results, nil
}