| // Copyright Istio 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 webhook |
| |
| import ( |
| "fmt" |
| "strings" |
| ) |
| |
| import ( |
| "istio.io/api/label" |
| v1 "k8s.io/api/admissionregistration/v1" |
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| klabels "k8s.io/apimachinery/pkg/labels" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go-pixiu/pkg/config/analysis" |
| "github.com/apache/dubbo-go-pixiu/pkg/config/analysis/msg" |
| "github.com/apache/dubbo-go-pixiu/pkg/config/resource" |
| "github.com/apache/dubbo-go-pixiu/pkg/config/schema/collection" |
| "github.com/apache/dubbo-go-pixiu/pkg/config/schema/collections" |
| "github.com/apache/dubbo-go-pixiu/pkg/util/sets" |
| ) |
| |
| var ( |
| webhookCol = collections.K8SAdmissionregistrationK8SIoV1Mutatingwebhookconfigurations.Name() |
| serviceCol = collections.K8SCoreV1Services.Name() |
| ) |
| |
| type Analyzer struct { |
| SkipServiceCheck bool |
| } |
| |
| var _ analysis.Analyzer = &Analyzer{} |
| |
| func (a *Analyzer) Metadata() analysis.Metadata { |
| return analysis.Metadata{ |
| Name: "webhook.Analyzer", |
| Description: "Checks the validity of Istio webhooks", |
| Inputs: collection.Names{ |
| webhookCol, |
| serviceCol, |
| }, |
| } |
| } |
| |
| func getNamespaceLabels() []klabels.Set { |
| return []klabels.Set{ |
| {}, |
| {"istio-injection": "enabled"}, |
| {"istio-injection": "disabled"}, |
| } |
| } |
| |
| func getObjectLabels() []klabels.Set { |
| return []klabels.Set{ |
| {}, |
| {"sidecar.istio.io/inject": "true"}, |
| {"sidecar.istio.io/inject": "false"}, |
| } |
| } |
| |
| func (a *Analyzer) Analyze(context analysis.Context) { |
| // First, extract and index all webhooks we found |
| webhooks := map[string][]v1.MutatingWebhook{} |
| resources := map[string]*resource.Instance{} |
| revisions := sets.New() |
| context.ForEach(webhookCol, func(resource *resource.Instance) bool { |
| wh := resource.Message.(*v1.MutatingWebhookConfiguration) |
| revs := extractRevisions(wh) |
| if len(revs) == 0 && !isIstioWebhook(wh) { |
| return true |
| } |
| webhooks[resource.Metadata.FullName.String()] = wh.Webhooks |
| for _, h := range wh.Webhooks { |
| resources[fmt.Sprintf("%v/%v", resource.Metadata.FullName.String(), h.Name)] = resource |
| } |
| revisions.InsertAll(revs...) |
| return true |
| }) |
| |
| // Set up all relevant namespace and object selector permutations |
| namespaceLabels := getNamespaceLabels() |
| for rev := range revisions { |
| for _, base := range getNamespaceLabels() { |
| base[label.IoIstioRev.Name] = rev |
| namespaceLabels = append(namespaceLabels, base) |
| } |
| } |
| objectLabels := getObjectLabels() |
| for rev := range revisions { |
| for _, base := range getObjectLabels() { |
| base[label.IoIstioRev.Name] = rev |
| objectLabels = append(objectLabels, base) |
| } |
| } |
| |
| // For each permutation, we check which webhooks it matches. It must match exactly 0 or 1! |
| for _, nl := range namespaceLabels { |
| for _, ol := range objectLabels { |
| matches := sets.New() |
| for name, whs := range webhooks { |
| for _, wh := range whs { |
| if selectorMatches(wh.NamespaceSelector, nl) && selectorMatches(wh.ObjectSelector, ol) { |
| matches.Insert(fmt.Sprintf("%v/%v", name, wh.Name)) |
| } |
| } |
| } |
| if len(matches) > 1 { |
| for match := range matches { |
| others := matches.Difference(sets.New(match)) |
| context.Report(webhookCol, msg.NewInvalidWebhook(resources[match], |
| fmt.Sprintf("Webhook overlaps with others: %v. This may cause injection to occur twice.", others.UnsortedList()))) |
| } |
| } |
| } |
| } |
| |
| // Next, check service references |
| if a.SkipServiceCheck { |
| return |
| } |
| for name, whs := range webhooks { |
| for _, wh := range whs { |
| if wh.ClientConfig.Service == nil { |
| // it is an url, skip it |
| continue |
| } |
| fname := resource.NewFullName( |
| resource.Namespace(wh.ClientConfig.Service.Namespace), |
| resource.LocalName(wh.ClientConfig.Service.Name)) |
| if !context.Exists(serviceCol, fname) { |
| context.Report(webhookCol, msg.NewInvalidWebhook(resources[fmt.Sprintf("%v/%v", name, wh.Name)], |
| fmt.Sprintf("Injector refers to a control plane service that does not exist: %v.", fname))) |
| } |
| } |
| } |
| } |
| |
| func isIstioWebhook(wh *v1.MutatingWebhookConfiguration) bool { |
| for _, w := range wh.Webhooks { |
| if strings.HasSuffix(w.Name, "istio.io") { |
| return true |
| } |
| } |
| return false |
| } |
| |
| func extractRevisions(wh *v1.MutatingWebhookConfiguration) []string { |
| revs := sets.New() |
| if r, f := wh.Labels[label.IoIstioRev.Name]; f { |
| revs.Insert(r) |
| } |
| for _, webhook := range wh.Webhooks { |
| if webhook.NamespaceSelector != nil { |
| if r, f := webhook.NamespaceSelector.MatchLabels[label.IoIstioRev.Name]; f { |
| revs.Insert(r) |
| } |
| |
| for _, ls := range webhook.NamespaceSelector.MatchExpressions { |
| if ls.Key == label.IoIstioRev.Name { |
| revs.InsertAll(ls.Values...) |
| } |
| } |
| } |
| if webhook.ObjectSelector != nil { |
| if r, f := webhook.ObjectSelector.MatchLabels[label.IoIstioRev.Name]; f { |
| revs.Insert(r) |
| } |
| |
| for _, ls := range webhook.ObjectSelector.MatchExpressions { |
| if ls.Key == label.IoIstioRev.Name { |
| revs.InsertAll(ls.Values...) |
| } |
| } |
| } |
| } |
| return revs.UnsortedList() |
| } |
| |
| func selectorMatches(selector *metav1.LabelSelector, labels klabels.Set) bool { |
| // From webhook spec: "Default to the empty LabelSelector, which matches everything." |
| if selector == nil { |
| return true |
| } |
| s, err := metav1.LabelSelectorAsSelector(selector) |
| if err != nil { |
| return false |
| } |
| return s.Matches(labels) |
| } |