82 lines
2.3 KiB
Go
82 lines
2.3 KiB
Go
|
/*
|
||
|
|
Copyright 2016 The Kubernetes Authors.
|
||
|
|
|
||
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
you may not use this file except in compliance with the License.
|
||
|
|
You may obtain a copy of the License at
|
||
|
|
|
||
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
|
||
|
|
Unless required by applicable law or agreed to in writing, software
|
||
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
See the License for the specific language governing permissions and
|
||
|
|
limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
package cert
|
||
|
|
|
||
|
|
import (
|
||
|
|
cryptorand "crypto/rand"
|
||
|
|
"crypto/rsa"
|
||
|
|
"crypto/x509"
|
||
|
|
"crypto/x509/pkix"
|
||
|
|
"encoding/pem"
|
||
|
|
"errors"
|
||
|
|
"net"
|
||
|
|
|
||
|
|
"k8s.io/client-go/1.5/pkg/apis/certificates"
|
||
|
|
)
|
||
|
|
|
||
|
|
// ParseCSR extracts the CSR from the API object and decodes it.
|
||
|
|
func ParseCSR(obj *certificates.CertificateSigningRequest) (*x509.CertificateRequest, error) {
|
||
|
|
// extract PEM from request object
|
||
|
|
pemBytes := obj.Spec.Request
|
||
|
|
block, _ := pem.Decode(pemBytes)
|
||
|
|
if block == nil || block.Type != "CERTIFICATE REQUEST" {
|
||
|
|
return nil, errors.New("PEM block type must be CERTIFICATE REQUEST")
|
||
|
|
}
|
||
|
|
csr, err := x509.ParseCertificateRequest(block.Bytes)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
return csr, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// MakeCSR generates a PEM-encoded CSR using the supplied private key, subject, and SANs.
|
||
|
|
// All key types that are implemented via crypto.Signer are supported (This includes *rsa.PrivateKey and *ecdsa.PrivateKey.)
|
||
|
|
func MakeCSR(privateKey interface{}, subject *pkix.Name, dnsSANs []string, ipSANs []net.IP) (csr []byte, err error) {
|
||
|
|
// Customize the signature for RSA keys, depending on the key size
|
||
|
|
var sigType x509.SignatureAlgorithm
|
||
|
|
if privateKey, ok := privateKey.(*rsa.PrivateKey); ok {
|
||
|
|
keySize := privateKey.N.BitLen()
|
||
|
|
switch {
|
||
|
|
case keySize >= 4096:
|
||
|
|
sigType = x509.SHA512WithRSA
|
||
|
|
case keySize >= 3072:
|
||
|
|
sigType = x509.SHA384WithRSA
|
||
|
|
default:
|
||
|
|
sigType = x509.SHA256WithRSA
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
template := &x509.CertificateRequest{
|
||
|
|
Subject: *subject,
|
||
|
|
SignatureAlgorithm: sigType,
|
||
|
|
DNSNames: dnsSANs,
|
||
|
|
IPAddresses: ipSANs,
|
||
|
|
}
|
||
|
|
|
||
|
|
csr, err = x509.CreateCertificateRequest(cryptorand.Reader, template, privateKey)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
csrPemBlock := &pem.Block{
|
||
|
|
Type: "CERTIFICATE REQUEST",
|
||
|
|
Bytes: csr,
|
||
|
|
}
|
||
|
|
|
||
|
|
return pem.EncodeToMemory(csrPemBlock), nil
|
||
|
|
}
|