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imagesignrequest.go
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imagesignrequest.go
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package v1
import (
"context"
"encoding/json"
"fmt"
"net/http"
regv1 "github.com/tmax-cloud/registry-operator/api/v1"
"k8s.io/api/admission/v1beta1"
authorization "k8s.io/api/authorization/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
func ImageSignRequest(ar *v1beta1.AdmissionReview, w http.ResponseWriter, r *http.Request) *v1beta1.AdmissionResponse {
req := ar.Request
// AdmissionReview for Kind=tmax.io/v1, Kind=ImageSigner, Namespace= Name=yun UID=685e6c98-a47c-4fb5-b2c5-8d8140eb0ffd patchOperation=CREATE UserInfo={admin@tmax.co.kr [system:authenticated] map[]}
logger.Info(fmt.Sprintf("AdmissionReview for Kind=%v, Namespace=%v Name=%v UID=%v patchOperation=%v UserInfo=%v",
req.Kind, req.Namespace, req.Name, req.UID, req.Operation, req.UserInfo))
if err := reviewAccessImageSigner(req); err != nil {
logger.Error(err, "image signer is not allowed. or failed to check subject's authorization")
return &v1beta1.AdmissionResponse{
Result: &metav1.Status{
Message: fmt.Sprintf("image signer is not allowed. or failed to check subject's authorization: %s", err.Error()),
},
}
}
return &v1beta1.AdmissionResponse{
Allowed: true,
}
}
func reviewAccessImageSigner(req *v1beta1.AdmissionRequest) error {
userName := req.UserInfo.Username
isr := ®v1.ImageSignRequest{}
if err := json.Unmarshal(req.Object.Raw, isr); err != nil {
logger.Error(err, "unable to unmarshal imagesignrequest", "name", req.Name)
return err
}
resourceName := isr.Spec.Signer
r := &authorization.SubjectAccessReview{
Spec: authorization.SubjectAccessReviewSpec{
User: userName,
ResourceAttributes: &authorization.ResourceAttributes{
Name: resourceName,
Group: "tmax.io",
Version: ApiVersion,
Resource: "signerkeys",
Verb: "get",
},
},
}
logger.Info("SubjectAccessReview", "spec", fmt.Sprintf("%+v", r.Spec))
result, err := authClient.SubjectAccessReviews().Create(context.TODO(), r, metav1.CreateOptions{})
if err != nil {
return err
}
if result.Status.Allowed {
return nil
}
return fmt.Errorf(result.Status.Reason)
}