/
openvpn.go
97 lines (79 loc) · 2.1 KB
/
openvpn.go
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package component
import (
"io/ioutil"
"log"
"os"
"os/exec"
certutil "k8s.io/client-go/util/cert"
pki "k8s.io/kubernetes/cmd/kubeadm/app/util/pkiutil"
)
const (
OpenVPNServerCert = "server.crt"
OpenVPNServerKey = "server.key"
OpenVPNCaCert = "ca.crt"
OpenVPNCaKey = "ca.key"
OpenVPNTaKey = "ta.key"
OpenVPNPath = "pki/vpn"
)
type OpenVPN struct {
ClusterComponentData
}
func (o OpenVPN) Backup() error {
return nil
}
func (o OpenVPN) Restore() error {
return nil
}
func (o OpenVPN) getFileMappings() [][]string {
return [][]string{
[]string{OpenVPNServerKey, OpenVPNServerKey},
[]string{OpenVPNServerCert, OpenVPNServerCert},
[]string{OpenVPNCaKey, OpenVPNCaKey},
[]string{OpenVPNCaCert, OpenVPNCaCert},
[]string{OpenVPNTaKey, OpenVPNTaKey},
}
}
func (o OpenVPN) Configure(overwrite bool) error {
files := o.getFileMappings()
return o.DownloadFilesToDirectory(files, o.OpenVPN.CertDir, OpenVPNPath, overwrite)
}
func (o OpenVPN) Init(dir string) error {
ca, privateKey, err := pki.NewCertificateAuthority(&CertConfig)
if err != nil {
log.Fatal(err)
}
serverCert, serverKey, err := pki.NewCertAndKey(ca, privateKey, &CertConfig)
if err != nil {
log.Fatal(err)
}
taKeyData, err := getTaKey()
if err != nil {
log.Fatal(err)
}
certs := map[string][]byte{
OpenVPNCaCert: certutil.EncodeCertPEM(ca),
OpenVPNCaKey: certutil.EncodePrivateKeyPEM(privateKey),
OpenVPNServerCert: certutil.EncodeCertPEM(serverCert),
OpenVPNServerKey: certutil.EncodePrivateKeyPEM(serverKey),
OpenVPNTaKey: taKeyData,
}
if err = o.UploadFilesFromMemory(certs, OpenVPNPath); err != nil {
log.Fatal(err)
}
return nil
}
func getTaKey() ([]byte, error) {
tmpfile, err := ioutil.TempFile("", "openvpn")
if err != nil {
return nil, err
}
defer os.Remove(tmpfile.Name()) // clean up
err = exec.Command("openvpn", "--genkey", "--secret", tmpfile.Name()).Run()
if err != nil {
return nil, err
}
data, err := ioutil.ReadFile(tmpfile.Name())
// fmt.Println("Temporary file is: ", tmpfile.Name())
// fmt.Println("With content: ", string(data))
return data, nil
}