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type CertConfig struct {
CommonName string
Organization []string
// AltNames contains the domain names and IP addresses that will be added
// to the API Server's x509 certificate SubAltNames field. The values will
// be passed directly to the x509.Certificate object.
AltNames struct {
DNSNames []string
IPs []net.IP
}
}
// NewPrivateKey creates an RSA private key
func NewPrivateKey(keyType x509.PublicKeyAlgorithm) (crypto.Signer, error) {
if keyType == x509.ECDSA {
return ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
}
return rsa.GenerateKey(rand.Reader, 2048)
}
func NewSigned(cfg CertConfig) (csr, keyPEM []byte, err error) {
key, err := NewPrivateKey(x509.RSA)
if err != nil {
return nil, nil, fmt.Errorf("new signed private failed %s", err)
}
pk := x509.MarshalPKCS1PrivateKey(key.(*rsa.PrivateKey))
keyPEM = pem.EncodeToMemory(&pem.Block{
Type: "RSA PRIVATE KEY", Bytes: pk,
})
_, csr, err = GenerateCSR(cfg, key)
csr = pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE REQUEST", Bytes: csr,
})
if err != nil {
return nil, nil, fmt.Errorf("new signed csr failed %s", err)
}
return
}
// GenerateCSR will generate a new *x509.CertificateRequest template to be used
// by issuers that utilise CSRs to obtain Certificates.
// The CSR will not be signed, and should be passed to either EncodeCSR or
// to the x509.CreateCertificateRequest function.
func GenerateCSR(cfg CertConfig, key crypto.Signer) (*x509.CertificateRequest, []byte, error) {
if len(cfg.CommonName) == 0 {
return nil, nil, errors.New("must specify a CommonName")
}
var dnsNames []string
var ips []net.IP
for _, v := range cfg.AltNames.DNSNames {
dnsNames = append(dnsNames, v)
}
for _, v := range cfg.AltNames.IPs {
ips = append(ips, v)
}
certTmpl := x509.CertificateRequest{
Subject: pkix.Name{
CommonName: cfg.CommonName,
Organization: cfg.Organization,
},
DNSNames: dnsNames,
IPAddresses: ips,
}
certDERBytes, err := x509.CreateCertificateRequest(rand.Reader, &certTmpl, key)
if err != nil {
return nil, nil, err
}
r1, r3 := x509.ParseCertificateRequest(certDERBytes)
return r1, certDERBytes, r3
}
func generateTLS() (csr []byte, key []byte, err error) {
host := fmt.Sprintf("%s.%s", "webhook-svc", "webhook")
dnsNames := []string{
host,
fmt.Sprintf("%s.svc", host),
fmt.Sprintf("%s.svc.cluster.local", host),
}
cfg := CertConfig{
CommonName: host,
Organization: []string{"selyun.com"},
AltNames: struct {
DNSNames []string
IPs []net.IP
}{
DNSNames: dnsNames,
},
}
csr, key, err = NewSigned(cfg)
return
}
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