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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -59,6 +59,7 @@ rules: | |
| - authentication.liqo.io | ||
| resources: | ||
| - resourceslices | ||
| - tenants | ||
| verbs: | ||
| - get | ||
| - list | ||
|
|
||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| // Copyright 2019-2025 The Liqo 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 tenant contains the logic of the Tenant webhook. | ||
| package tenant |
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2019-2025 The Liqo 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 tenant | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "net/http" | ||
|
|
||
| admissionv1 "k8s.io/api/admission/v1" | ||
| corev1 "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/klog/v2" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| "sigs.k8s.io/controller-runtime/pkg/webhook" | ||
| "sigs.k8s.io/controller-runtime/pkg/webhook/admission" | ||
|
|
||
| authv1beta1 "github.com/liqotech/liqo/apis/authentication/v1beta1" | ||
| "github.com/liqotech/liqo/pkg/consts" | ||
| "github.com/liqotech/liqo/pkg/liqoctl/output" | ||
| ) | ||
|
|
||
| // cluster-role | ||
| // +kubebuilder:rbac:groups=authentication.liqo.io,resources=tenants,verbs=get;list;watch; | ||
| // +kubebuilder:rbac:groups=core,resources=namespaces,verbs=get;list; | ||
|
|
||
| type tenantDecoder struct { | ||
| decoder admission.Decoder | ||
| } | ||
|
|
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| type tenantWebhookHandler struct { | ||
| client client.Client | ||
| tenantDecoder | ||
| } | ||
|
|
||
| // NewValidator returns a new Tenant validating webhook. | ||
| func NewValidator(cl client.Client) *webhook.Admission { | ||
| return &webhook.Admission{ | ||
| Handler: &tenantWebhookHandler{ | ||
| tenantDecoder: tenantDecoder{ | ||
| decoder: admission.NewDecoder(runtime.NewScheme()), | ||
| }, | ||
| client: cl, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| // DecodeTenant decodes the Tenant from the incoming request. | ||
| func (w *tenantDecoder) DecodeTenant(obj runtime.RawExtension) (*authv1beta1.Tenant, error) { | ||
| var tenant authv1beta1.Tenant | ||
| err := w.decoder.DecodeRaw(obj, &tenant) | ||
| return &tenant, err | ||
| } | ||
|
|
||
| // Handle implements the Tenant validating webhook logic. | ||
| func (w *tenantWebhookHandler) Handle(ctx context.Context, req admission.Request) admission.Response { | ||
| switch req.Operation { | ||
| case admissionv1.Create: | ||
| return w.handleCreate(ctx, &req) | ||
| case admissionv1.Update: | ||
| return w.handleUpdate(ctx, &req) | ||
| default: | ||
| return admission.Allowed("") | ||
| } | ||
| } | ||
|
|
||
| func (w *tenantWebhookHandler) handleCreate(ctx context.Context, req *admission.Request) admission.Response { | ||
| tenant, err := w.DecodeTenant(req.Object) | ||
| if err != nil { | ||
| klog.Errorf("Failed decoding Tenant object: %v", err) | ||
| return admission.Errored(http.StatusInternalServerError, err) | ||
| } | ||
|
|
||
| if status, err := w.tenantConsistencyChecks(ctx, tenant); err != nil { | ||
| return admission.Errored(status, err) | ||
| } | ||
|
|
||
| // Check that there is one single Tenant in the tenant namespace. | ||
| tenantsInNamespace, err := w.getTenants(ctx, tenant.Namespace, nil) | ||
| if err != nil { | ||
| werr := fmt.Errorf("Failed getting Tenants in tenant namespace: %v", output.PrettyErr(err)) | ||
| klog.Error(werr) | ||
| return admission.Errored(http.StatusInternalServerError, werr) | ||
| } | ||
|
|
||
| if len(tenantsInNamespace) > 0 { | ||
| return admission.Denied("a Tenant already exists in the tenant namespace") | ||
| } | ||
|
|
||
| // Check that the Tenant name is unique in the entire cluster. | ||
| tenantsInCluster, err := w.getTenants(ctx, corev1.NamespaceAll, &tenant.Name) | ||
| if err != nil { | ||
| werr := fmt.Errorf("Failed getting Tenants in cluster: %v", output.PrettyErr(err)) | ||
| klog.Error(werr) | ||
| return admission.Errored(http.StatusInternalServerError, werr) | ||
| } | ||
|
|
||
| if len(tenantsInCluster) > 0 { | ||
| return admission.Denied("a Tenant with the same name already exists in the cluster") | ||
| } | ||
|
|
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| return admission.Allowed("") | ||
| } | ||
|
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| func (w *tenantWebhookHandler) handleUpdate(ctx context.Context, req *admission.Request) admission.Response { | ||
| tenant, err := w.DecodeTenant(req.Object) | ||
| if err != nil { | ||
| klog.Errorf("Failed decoding Tenant object: %v", err) | ||
| return admission.Errored(http.StatusInternalServerError, err) | ||
| } | ||
|
|
||
| if status, err := w.tenantConsistencyChecks(ctx, tenant); err != nil { | ||
| return admission.Errored(status, err) | ||
| } | ||
|
|
||
| // Check that the Tenant name is unique in the tenant namespace. | ||
| tenantsInCluster, err := w.getTenants(ctx, corev1.NamespaceAll, &tenant.Name) | ||
| if err != nil { | ||
| werr := fmt.Errorf("Failed getting Tenants in cluster: %v", output.PrettyErr(err)) | ||
| klog.Error(werr) | ||
| return admission.Errored(http.StatusInternalServerError, werr) | ||
| } | ||
|
|
||
| // If there already is a Tenant with the given name but it is not the same Tenant, deny the update. | ||
| if len(tenantsInCluster) == 1 && tenantsInCluster[0].UID != tenant.UID { | ||
| return admission.Denied("a Tenant with the same name already exists in the cluster") | ||
| } | ||
|
|
||
| return admission.Allowed("") | ||
| } | ||
|
|
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| func (w *tenantWebhookHandler) tenantConsistencyChecks(ctx context.Context, tenant *authv1beta1.Tenant) (code int32, err error) { | ||
| // Check that the Tenant has been created in the proper tenant namespace. | ||
| var ns corev1.Namespace | ||
| if err := w.client.Get(ctx, client.ObjectKey{Name: tenant.Namespace}, &ns); err != nil { | ||
| werr := fmt.Errorf("Failed getting the tenant namespace: %v", output.PrettyErr(err)) | ||
| return http.StatusInternalServerError, werr | ||
| } | ||
|
|
||
| if ns.Labels[consts.TenantNamespaceLabel] != "true" { | ||
| return http.StatusForbidden, errors.New("the Tenant must be created in a tenant namespace") | ||
| } | ||
|
|
||
| // Check that the Tenant has the same cluster ID of its tenant namespace. | ||
| if string(tenant.Spec.ClusterID) != ns.Labels[consts.RemoteClusterID] { | ||
| return http.StatusForbidden, errors.New("the Tenant must have the same cluster ID of its tenant namespace") | ||
| } | ||
|
|
||
| return http.StatusOK, nil | ||
| } | ||
|
|
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| func (w *tenantWebhookHandler) getTenants(ctx context.Context, namespace string, name *string) ([]authv1beta1.Tenant, error) { | ||
| var tenantList authv1beta1.TenantList | ||
|
|
||
| opts := []client.ListOption{ | ||
| client.InNamespace(namespace), | ||
| } | ||
| if name != nil { | ||
| opts = append(opts, client.MatchingFields{"metadata.name": *name}) | ||
| } | ||
| if err := w.client.List(ctx, &tenantList, opts...); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return tenantList.Items, nil | ||
| } |