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certgenerator.go
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certgenerator.go
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package generator
import (
"fmt"
"time"
"github.com/openshift/library-go/pkg/crypto"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apiserver/pkg/authentication/user"
"kubevirt.io/containerized-data-importer/pkg/util/cert/fetcher"
)
// CertGenerator is an interface for creating certs
type CertGenerator interface {
MakeClientCert(name string, groups []string, duration time.Duration) ([]byte, []byte, error)
MakeServerCert(namespace, service string, duration time.Duration) ([]byte, []byte, error)
}
// FetchCertGenerator fetches and generates certs
type FetchCertGenerator struct {
Fetcher fetcher.CertFetcher
}
// MakeClientCert generates a client cert
func (cg *FetchCertGenerator) MakeClientCert(name string, groups []string, duration time.Duration) ([]byte, []byte, error) {
ca, err := cg.getCA()
if err != nil {
return nil, nil, err
}
userInfo := &user.DefaultInfo{Name: name, Groups: groups}
certKeyPair, err := ca.MakeClientCertificateForDuration(userInfo, duration)
if err != nil {
return nil, nil, err
}
return certKeyPair.GetPEMBytes()
}
// MakeServerCert generates a server cert
func (cg *FetchCertGenerator) MakeServerCert(namespace, service string, duration time.Duration) ([]byte, []byte, error) {
ca, err := cg.getCA()
if err != nil {
return nil, nil, err
}
hostnames := sets.NewString(serviceToHostnames(namespace, service)...)
certKeyPair, err := ca.MakeServerCertForDuration(hostnames, duration)
if err != nil {
return nil, nil, err
}
return certKeyPair.GetPEMBytes()
}
func (cg *FetchCertGenerator) getCA() (*crypto.CA, error) {
cert, err := cg.Fetcher.CertBytes()
if err != nil {
return nil, err
}
key, err := cg.Fetcher.KeyBytes()
if err != nil {
return nil, err
}
ca, err := crypto.GetCAFromBytes(cert, key)
if err != nil {
return nil, err
}
return ca, nil
}
func serviceToHostnames(namespace, service string) []string {
return []string{
service,
fmt.Sprintf("%s.%s", service, namespace),
fmt.Sprintf("%s.%s.svc", service, namespace),
}
}