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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| /* | ||
| Copyright 2020 The Kubernetes 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 v1alpha1 | ||
|
|
||
| import ( | ||
| "encoding/base64" | ||
| "fmt" | ||
|
|
||
| "github.com/cloudflare/cfssl/cli/genkey" | ||
| "github.com/cloudflare/cfssl/config" | ||
| "github.com/cloudflare/cfssl/csr" | ||
| "github.com/cloudflare/cfssl/helpers" | ||
| "github.com/cloudflare/cfssl/selfsign" | ||
| "sigs.k8s.io/kustomize/kyaml/fn/framework" | ||
| "sigs.k8s.io/kustomize/kyaml/kio" | ||
| "sigs.k8s.io/kustomize/kyaml/yaml" | ||
| ) | ||
|
|
||
| var _ kio.Filter = &CertFilter{} | ||
|
|
||
| // CertFilter generates and injects certificates into webhook | ||
| type CertFilter struct { | ||
| *APIConfiguration | ||
| } | ||
|
|
||
| // Filter implements kio.Filter | ||
| func (c CertFilter) Filter(input []*yaml.RNode) ([]*yaml.RNode, error) { | ||
| if !c.Spec.Development.GenerateCert { | ||
| return input, nil | ||
| } | ||
| if err := c.generateCert(); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| s := &framework.Selector{ | ||
| Kinds: []string{ | ||
| "ValidatingWebhookConfiguration", | ||
| "MutatingWebhookConfiguration", | ||
| }, | ||
| } | ||
| matches, err := s.GetMatches(&framework.ResourceList{Items: input}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| for i := range matches { | ||
| wh := matches[i].Field("webhooks") | ||
| if wh.IsNilOrEmpty() { | ||
| continue | ||
| } | ||
| err := wh.Value.VisitElements(func(node *yaml.RNode) error { | ||
| err := node.PipeE(yaml.LookupCreate(yaml.ScalarNode, "clientConfig", "caBundle"), | ||
| yaml.FieldSetter{StringValue: c.Status.CertCA}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| err = node.PipeE(yaml.LookupCreate(yaml.ScalarNode, "clientConfig", "service", "namespace"), | ||
| yaml.FieldSetter{StringValue: c.Spec.Namespace}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
|
||
| s = &framework.Selector{ | ||
| Filter: func(n *yaml.RNode) bool { | ||
| // Allow-list conversion webhooks | ||
| m, _ := n.GetMeta() | ||
| if m.Kind != "CustomResourceDefinition" { | ||
| return true | ||
| } | ||
| return c.Spec.ConversionWebhooks[m.Name] | ||
| }, | ||
| } | ||
| matches, err = s.GetMatches(&framework.ResourceList{Items: input}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| for i := range matches { | ||
| err := matches[i].PipeE(yaml.LookupCreate(yaml.ScalarNode, "spec", "conversion", "strategy"), | ||
| yaml.FieldSetter{StringValue: "Webhook"}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| err = matches[i].PipeE(yaml.LookupCreate(yaml.ScalarNode, "spec", "conversion", "webhookClientConfig", "caBundle"), | ||
| yaml.FieldSetter{StringValue: c.Status.CertCA}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| err = matches[i].PipeE(yaml.LookupCreate(yaml.ScalarNode, "spec", "conversion", "webhookClientConfig", "service", "name"), | ||
| yaml.FieldSetter{StringValue: "webhook-service"}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| err = matches[i].PipeE(yaml.LookupCreate(yaml.ScalarNode, "spec", "conversion", "webhookClientConfig", "service", "namespace"), | ||
| yaml.FieldSetter{StringValue: c.Spec.Namespace}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| err = matches[i].PipeE(yaml.LookupCreate(yaml.ScalarNode, "spec", "conversion", "webhookClientConfig", "service", "path"), | ||
| yaml.FieldSetter{StringValue: "/convert"}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
|
||
| return input, nil | ||
| } | ||
|
|
||
| func (c CertFilter) generateCert() error { | ||
| var err error | ||
| var req = csr.New() | ||
| req.Hosts = []string{ | ||
| fmt.Sprintf("webhook-service.%s.svc", c.Spec.Namespace), | ||
| fmt.Sprintf("webhook-service.%s.svc.cluster.local", c.Spec.Namespace), | ||
| } | ||
| req.CN = "kb-dev-controller-manager" | ||
|
|
||
| var key, csrPEM []byte | ||
| g := &csr.Generator{Validator: genkey.Validator} | ||
| csrPEM, key, err = g.ProcessRequest(req) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| priv, err := helpers.ParsePrivateKeyPEM(key) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| profile := config.DefaultConfig() | ||
| profile.Expiry = c.Spec.Development.CertDuration | ||
| cert, err := selfsign.Sign(priv, csrPEM, profile) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| c.Status.CertCA = base64.StdEncoding.EncodeToString(cert) | ||
| c.Status.CertKey = base64.StdEncoding.EncodeToString(key) | ||
| return nil | ||
| } |
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