mirror of
https://github.com/projectcapsule/capsule.git
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126 lines
3.8 KiB
Go
126 lines
3.8 KiB
Go
// Copyright 2020-2021 Clastix Labs
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// SPDX-License-Identifier: Apache-2.0
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package services
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import (
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"context"
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"net"
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"net/http"
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"strings"
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corev1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/fields"
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"k8s.io/client-go/tools/record"
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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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capsulewebhook "github.com/clastix/capsule/pkg/webhook"
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)
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// +kubebuilder:webhook:path=/validating-external-service-ips,mutating=false,sideEffects=None,admissionReviewVersions=v1,failurePolicy=fail,groups="",resources=services,verbs=create;update,versions=v1,name=validating-external-service-ips.capsule.clastix.io
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const (
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enableNodePortsAnnotation = "capsule.clastix.io/enable-node-ports"
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)
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type webhook struct {
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handler capsulewebhook.Handler
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}
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func Webhook(handler capsulewebhook.Handler) capsulewebhook.Webhook {
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return &webhook{handler: handler}
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}
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func (w *webhook) GetHandler() capsulewebhook.Handler {
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return w.handler
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}
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func (w *webhook) GetName() string {
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return "Service"
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}
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func (w *webhook) GetPath() string {
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return "/validating-external-service-ips"
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}
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type handler struct{}
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func Handler() capsulewebhook.Handler {
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return &handler{}
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}
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func (r *handler) handleService(ctx context.Context, clt client.Client, decoder *admission.Decoder, req admission.Request, recorder record.EventRecorder) admission.Response {
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svc := &corev1.Service{}
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if err := decoder.Decode(req, svc); err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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tntList := &v1alpha1.TenantList{}
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if err := clt.List(ctx, tntList, client.MatchingFieldsSelector{
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Selector: fields.OneTermEqualSelector(".status.namespaces", svc.GetNamespace()),
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}); err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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if len(tntList.Items) == 0 {
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return admission.Allowed("")
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}
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tnt := tntList.Items[0]
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if svc.Spec.Type == corev1.ServiceTypeNodePort && tnt.GetAnnotations()[enableNodePortsAnnotation] == "false" {
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recorder.Eventf(&tnt, corev1.EventTypeWarning, "ForbiddenNodePort", "Service %s/%s cannot be type of NodePort for the current Tenant", req.Namespace, req.Name)
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return admission.Errored(http.StatusBadRequest, NewNodePortDisabledError())
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}
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if svc.Spec.ExternalIPs == nil || tnt.Spec.ExternalServiceIPs == nil {
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return admission.Allowed("")
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}
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ipInCIDR := func(ip net.IP) bool {
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for _, allowed := range tnt.Spec.ExternalServiceIPs.Allowed {
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if !strings.Contains(string(allowed), "/") {
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allowed += "/32"
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}
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_, allowedIP, _ := net.ParseCIDR(string(allowed))
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if allowedIP.Contains(ip) {
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return true
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}
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}
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return false
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}
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for _, externalIP := range svc.Spec.ExternalIPs {
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ip := net.ParseIP(externalIP)
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if !ipInCIDR(ip) {
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recorder.Eventf(&tnt, corev1.EventTypeWarning, "ForbiddenExternalServiceIP", "Service %s/%s external IP %s is forbidden for the current Tenant", req.Namespace, req.Name, ip.String())
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return admission.Errored(http.StatusBadRequest, NewExternalServiceIPForbidden(tnt.Spec.ExternalServiceIPs.Allowed))
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}
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}
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return admission.Allowed("")
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}
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func (r *handler) OnCreate(client client.Client, decoder *admission.Decoder, recorder record.EventRecorder) capsulewebhook.Func {
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return func(ctx context.Context, req admission.Request) admission.Response {
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return r.handleService(ctx, client, decoder, req, recorder)
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}
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}
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func (r *handler) OnUpdate(client client.Client, decoder *admission.Decoder, recorder record.EventRecorder) capsulewebhook.Func {
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return func(ctx context.Context, req admission.Request) admission.Response {
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return r.handleService(ctx, client, decoder, req, recorder)
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}
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}
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func (r *handler) OnDelete(client.Client, *admission.Decoder, record.EventRecorder) capsulewebhook.Func {
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return func(ctx context.Context, req admission.Request) admission.Response {
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return admission.Allowed("")
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}
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}
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