// validateCSR validates the signature and formatting of a base64-wrapped,
// PEM-encoded PKCS#10 certificate signing request. If this is invalid, we must
// not accept the CSR for further processing.
func validateCSR(obj *certificates.CertificateSigningRequest) error {
csr, err := certutil.ParseCSR(obj)
if err != nil {
return err
}
// check that the signature is valid
err = csr.CheckSignature()
if err != nil {
return err
}
return nil
}
func (cc *CertificateController) maybeAutoApproveCSR(csr *certificates.CertificateSigningRequest) (*certificates.CertificateSigningRequest, error) {
// short-circuit if we're not auto-approving
if cc.approveAllKubeletCSRsForGroup == "" {
return csr, nil
}
// short-circuit if we're already approved or denied
if approved, denied := getCertApprovalCondition(&csr.Status); approved || denied {
return csr, nil
}
isKubeletBootstrapGroup := false
for _, g := range csr.Spec.Groups {
if g == cc.approveAllKubeletCSRsForGroup {
isKubeletBootstrapGroup = true
break
}
}
if !isKubeletBootstrapGroup {
return csr, nil
}
x509cr, err := certutil.ParseCSR(csr)
if err != nil {
utilruntime.HandleError(fmt.Errorf("unable to parse csr %q: %v", csr.Name, err))
return csr, nil
}
if !reflect.DeepEqual([]string{"system:nodes"}, x509cr.Subject.Organization) {
return csr, nil
}
if !strings.HasPrefix(x509cr.Subject.CommonName, "system:node:") {
return csr, nil
}
if len(x509cr.DNSNames)+len(x509cr.EmailAddresses)+len(x509cr.IPAddresses) != 0 {
return csr, nil
}
csr.Status.Conditions = append(csr.Status.Conditions, certificates.CertificateSigningRequestCondition{
Type: certificates.CertificateApproved,
Reason: "AutoApproved",
Message: "Auto approving of all kubelet CSRs is enabled on the controller manager",
})
return cc.kubeClient.Certificates().CertificateSigningRequests().UpdateApproval(csr)
}