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Add example program for SubjectAccessReviews
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/* | ||
Copyright 2021 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 main | ||
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import ( | ||
"os" | ||
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_ "k8s.io/client-go/plugin/pkg/client/auth/gcp" | ||
"sigs.k8s.io/controller-runtime/pkg/client/config" | ||
"sigs.k8s.io/controller-runtime/pkg/log" | ||
"sigs.k8s.io/controller-runtime/pkg/log/zap" | ||
"sigs.k8s.io/controller-runtime/pkg/manager" | ||
"sigs.k8s.io/controller-runtime/pkg/manager/signals" | ||
"sigs.k8s.io/controller-runtime/pkg/webhook/authorization" | ||
) | ||
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func init() { | ||
log.SetLogger(zap.New()) | ||
} | ||
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func main() { | ||
entryLog := log.Log.WithName("entrypoint") | ||
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// Setup a Manager | ||
entryLog.Info("setting up manager") | ||
mgr, err := manager.New(config.GetConfigOrDie(), manager.Options{}) | ||
if err != nil { | ||
entryLog.Error(err, "unable to set up overall controller manager") | ||
os.Exit(1) | ||
} | ||
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// Setup webhooks | ||
entryLog.Info("setting up webhook server") | ||
hookServer := mgr.GetWebhookServer() | ||
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entryLog.Info("registering webhooks to the webhook server") | ||
hookServer.Register("/validate-v1-subjectaccessreview", &authorization.Webhook{Handler: &authorizer{}}) | ||
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entryLog.Info("starting manager") | ||
if err := mgr.Start(signals.SetupSignalHandler()); err != nil { | ||
entryLog.Error(err, "unable to run manager") | ||
os.Exit(1) | ||
} | ||
} |
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/* | ||
Copyright 2021 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 main | ||
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import ( | ||
"context" | ||
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"sigs.k8s.io/controller-runtime/pkg/webhook/authorization" | ||
) | ||
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// authorizer validates subjectaccessreviews | ||
type authorizer struct { | ||
} | ||
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// authorizer admits a request by the token. | ||
func (a *authorizer) Handle(ctx context.Context, req authorization.Request) authorization.Response { | ||
if req.Spec.User == "system:anonymous" { | ||
return authorization.Denied("anonymous users are not allowed") | ||
} | ||
if req.Spec.User == "foo" { | ||
return authorization.NoOpinion("I don't care if foo is authorized or not") | ||
} | ||
return authorization.Allowed() | ||
} |