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/* | ||
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. | ||
*/ | ||
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package v1alpha1 | ||
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import ( | ||
"encoding/base64" | ||
"fmt" | ||
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"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" | ||
) | ||
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var _ kio.Filter = &CertFilter{} | ||
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// CertFilter generates and injects certificates into webhook | ||
type CertFilter struct { | ||
*APIConfiguration | ||
} | ||
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// 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 | ||
} | ||
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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 | ||
} | ||
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return nil | ||
}) | ||
if err != nil { | ||
return nil, err | ||
} | ||
} | ||
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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 | ||
} | ||
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err = matches[i].PipeE(yaml.LookupCreate(yaml.ScalarNode, "spec", "conversion", "webhookClientConfig", "service", "path"), | ||
yaml.FieldSetter{StringValue: "/convert"}) | ||
if err != nil { | ||
return nil, err | ||
} | ||
} | ||
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return input, nil | ||
} | ||
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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" | ||
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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 | ||
} | ||
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profile := config.DefaultConfig() | ||
profile.Expiry = c.Spec.Development.CertDuration | ||
cert, err := selfsign.Sign(priv, csrPEM, profile) | ||
if err != nil { | ||
return err | ||
} | ||
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c.Status.CertCA = base64.StdEncoding.EncodeToString(cert) | ||
c.Status.CertKey = base64.StdEncoding.EncodeToString(key) | ||
return nil | ||
} |
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