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csr.go
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csr.go
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package k8sProvider
import (
"context"
"fmt"
"time"
"github.com/mohae/deepcopy"
log "github.com/sirupsen/logrus"
apicertificatesv1 "k8s.io/api/certificates/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
var (
MAXCSRRETRIES int = 20
CSRRETRYSLEEP int = 5
)
// deletes CSR if it exists.
func DeleteCSR(k8s *kubernetes.Clientset, ctx context.Context, name *string) error {
err := k8s.CertificatesV1().CertificateSigningRequests().Delete(ctx, *name, metav1.DeleteOptions{})
if errors.IsNotFound(err) {
log.Debugf("CSR delete didn't succeed because it was no longer there.")
return nil
}
return err
}
// creates new CSR
func CreateCSR(k8s *kubernetes.Clientset, ctx context.Context, name *string, csr []byte) (*apicertificatesv1.CertificateSigningRequest, error) {
signerName := "kubernetes.io/kubelet-serving"
csrApply := apicertificatesv1.CertificateSigningRequest{
ObjectMeta: metav1.ObjectMeta{
Name: *name,
},
Spec: apicertificatesv1.CertificateSigningRequestSpec{
Request: csr,
Groups: []string{"system:authenticated"},
SignerName: signerName,
Usages: []apicertificatesv1.KeyUsage{
apicertificatesv1.UsageKeyEncipherment,
apicertificatesv1.UsageDigitalSignature,
apicertificatesv1.UsageServerAuth,
},
},
}
crs, err := k8s.CertificatesV1().CertificateSigningRequests().Create(ctx, &csrApply, metav1.CreateOptions{FieldManager: FIELDMANAGER})
return crs, err
}
func ApproveCSR(k8s *kubernetes.Clientset, ctx context.Context, name *string, csr *apicertificatesv1.CertificateSigningRequest) error {
csrCopy := deepcopy.Copy(*csr).(apicertificatesv1.CertificateSigningRequest)
csrCopy.Status.Conditions = append(csrCopy.Status.Conditions, apicertificatesv1.CertificateSigningRequestCondition{
Type: apicertificatesv1.CertificateApproved,
Reason: "Approved",
Message: "Approved by vault-k8s-helper",
LastUpdateTime: metav1.Now(),
Status: corev1.ConditionTrue,
})
_, err := k8s.CertificatesV1().CertificateSigningRequests().UpdateApproval(ctx, *name, &csrCopy, metav1.UpdateOptions{})
return err
}
func GetCSRCertificate(k8s *kubernetes.Clientset, ctx context.Context, name *string) (csrContent []byte, err error) {
log.Infof("Waiting for CSR %s to have certificate generated...", *name)
var csr *apicertificatesv1.CertificateSigningRequest
for count := 0; count < MAXCSRRETRIES; count++ {
csr, err = k8s.CertificatesV1().CertificateSigningRequests().Get(ctx, *name, metav1.GetOptions{})
if err != nil {
return
}
if len(csr.Status.Certificate) != 0 {
csrContent = csr.Status.Certificate
log.Infof("Received signed certificate after %d iterations", count+1)
return
}
time.Sleep(time.Duration(CSRRETRYSLEEP) * time.Second)
}
err = fmt.Errorf("Certificate still not generated for CSR %s", *name)
return
}