mirror of
https://github.com/projectcapsule/capsule.git
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109 lines
3.1 KiB
Go
109 lines
3.1 KiB
Go
// Copyright 2020-2021 Clastix Labs
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// SPDX-License-Identifier: Apache-2.0
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package pod
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import (
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"context"
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"net/http"
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corev1 "k8s.io/api/core/v1"
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nodev1 "k8s.io/api/node/v1"
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"k8s.io/apimachinery/pkg/fields"
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"k8s.io/apimachinery/pkg/types"
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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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capsulev1beta2 "github.com/clastix/capsule/api/v1beta2"
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capsulewebhook "github.com/clastix/capsule/pkg/webhook"
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"github.com/clastix/capsule/pkg/webhook/utils"
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)
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type runtimeClass struct{}
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func RuntimeClass() capsulewebhook.Handler {
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return &runtimeClass{}
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}
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func (h *runtimeClass) class(ctx context.Context, c client.Client, name string) (client.Object, error) {
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if len(name) == 0 {
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return nil, nil
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}
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obj := &nodev1.RuntimeClass{}
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if err := c.Get(ctx, types.NamespacedName{Name: name}, obj); err != nil {
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return nil, err
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}
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return obj, nil
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}
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func (h *runtimeClass) OnCreate(c 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 h.validate(ctx, c, decoder, recorder, req)
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}
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}
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func (h *runtimeClass) 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 nil
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}
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}
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func (h *runtimeClass) OnUpdate(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 nil
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}
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}
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func (h *runtimeClass) validate(ctx context.Context, c client.Client, decoder *admission.Decoder, recorder record.EventRecorder, req admission.Request) *admission.Response {
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pod := &corev1.Pod{}
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if err := decoder.Decode(req, pod); err != nil {
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return utils.ErroredResponse(err)
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}
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tntList := &capsulev1beta2.TenantList{}
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if err := c.List(ctx, tntList, client.MatchingFieldsSelector{
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Selector: fields.OneTermEqualSelector(".status.namespaces", pod.Namespace),
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}); err != nil {
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return utils.ErroredResponse(err)
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}
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if len(tntList.Items) == 0 {
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return nil
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}
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allowed := tntList.Items[0].Spec.RuntimeClasses
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runtimeClassName := ""
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if pod.Spec.RuntimeClassName != nil {
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runtimeClassName = *pod.Spec.RuntimeClassName
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}
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class, err := h.class(ctx, c, runtimeClassName)
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if err != nil {
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response := admission.Errored(http.StatusInternalServerError, err)
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return &response
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}
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switch {
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case allowed == nil:
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// Enforcement is not in place, skipping it at all
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return nil
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case len(runtimeClassName) == 0:
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// We don't have to force Pod to specify a RuntimeClass
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return nil
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case !allowed.ExactMatch(runtimeClassName) && !allowed.RegexMatch(runtimeClassName) && !allowed.SelectorMatch(class):
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recorder.Eventf(&tntList.Items[0], corev1.EventTypeWarning, "ForbiddenRuntimeClass", "Pod %s/%s is using Runtime Class %s is forbidden for the current Tenant", pod.Namespace, pod.Name, runtimeClassName)
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response := admission.Denied(NewPodRuntimeClassForbidden(runtimeClassName, *allowed).Error())
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return &response
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default:
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return nil
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}
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}
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