mirror of
https://github.com/projectcapsule/capsule.git
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95 lines
2.9 KiB
Go
95 lines
2.9 KiB
Go
/*
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Copyright 2020 Clastix Labs.
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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 network_policies
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import (
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"context"
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"net/http"
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networkingv1 "k8s.io/api/networking/v1"
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"k8s.io/apimachinery/pkg/types"
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"sigs.k8s.io/controller-runtime/pkg/client"
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"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
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"github.com/clastix/capsule/api/v1alpha1"
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"github.com/clastix/capsule/pkg/webhook"
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)
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// +kubebuilder:webhook:path=/validating-v1-network-policy,mutating=false,failurePolicy=fail,groups=networking.k8s.io,resources=networkpolicies,verbs=create;update;delete,versions=v1,name=validating.network-policy.capsule.clastix.io
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type Webhook struct{}
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func (n Webhook) GetHandler() webhook.Handler {
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return &handler{}
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}
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func (n Webhook) GetName() string {
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return "NetworkPolicy"
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}
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func (n Webhook) GetPath() string {
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return "/validating-v1-network-policy"
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}
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type handler struct {
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}
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func (r *handler) OnCreate(ctx context.Context, req admission.Request, client client.Client, decoder *admission.Decoder) admission.Response {
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return admission.Allowed("")
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}
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func (r *handler) generic(ctx context.Context, req admission.Request, client client.Client, decoder *admission.Decoder) (bool, error) {
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var err error
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np := &networkingv1.NetworkPolicy{}
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err = client.Get(ctx, types.NamespacedName{Namespace: req.AdmissionRequest.Namespace, Name: req.AdmissionRequest.Name}, np)
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if err != nil {
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return false, err
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}
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return r.isCapsuleNetworkPolicy(np), nil
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}
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func (r *handler) OnDelete(ctx context.Context, req admission.Request, client client.Client, decoder *admission.Decoder) admission.Response {
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ok, err := r.generic(ctx, req, client, decoder)
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if err != nil {
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return admission.Errored(http.StatusInternalServerError, err)
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}
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if ok {
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return admission.Denied("Capsule Network Policies cannot be deleted: please, reach out the system administrators")
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}
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return admission.Allowed("")
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}
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func (r *handler) isCapsuleNetworkPolicy(np *networkingv1.NetworkPolicy) (ok bool) {
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l, _ := v1alpha1.GetTypeLabel(&v1alpha1.Tenant{})
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_, ok = np.GetLabels()[l]
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return
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}
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func (r *handler) OnUpdate(ctx context.Context, req admission.Request, client client.Client, decoder *admission.Decoder) admission.Response {
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ok, err := r.generic(ctx, req, client, decoder)
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if err != nil {
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return admission.Errored(http.StatusInternalServerError, err)
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}
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if ok {
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return admission.Denied("Capsule Network Policies cannot be updated: please, reach out the system administrators")
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}
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return admission.Allowed("")
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}
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