mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-22 21:10:22 +00:00
270 lines
8.4 KiB
Go
270 lines
8.4 KiB
Go
/*
|
|
Copyright 2014 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 (
|
|
"bytes"
|
|
"crypto"
|
|
"crypto/ecdsa"
|
|
"crypto/elliptic"
|
|
"crypto/rand"
|
|
cryptorand "crypto/rand"
|
|
"crypto/rsa"
|
|
"crypto/x509"
|
|
"crypto/x509/pkix"
|
|
"encoding/pem"
|
|
"errors"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"math"
|
|
"math/big"
|
|
"net"
|
|
"path"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
const (
|
|
rsaKeySize = 2048
|
|
duration365d = time.Hour * 24 * 365
|
|
)
|
|
|
|
// Config contains the basic fields required for creating a certificate
|
|
type Config struct {
|
|
CommonName string
|
|
Organization []string
|
|
AltNames AltNames
|
|
Usages []x509.ExtKeyUsage
|
|
}
|
|
|
|
// 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.
|
|
type AltNames struct {
|
|
DNSNames []string
|
|
IPs []net.IP
|
|
}
|
|
|
|
// NewPrivateKey creates an RSA private key
|
|
func NewPrivateKey() (*rsa.PrivateKey, error) {
|
|
return rsa.GenerateKey(cryptorand.Reader, rsaKeySize)
|
|
}
|
|
|
|
// NewSelfSignedCACert creates a CA certificate
|
|
func NewSelfSignedCACert(cfg Config, key crypto.Signer) (*x509.Certificate, error) {
|
|
now := time.Now()
|
|
tmpl := x509.Certificate{
|
|
SerialNumber: new(big.Int).SetInt64(0),
|
|
Subject: pkix.Name{
|
|
CommonName: cfg.CommonName,
|
|
Organization: cfg.Organization,
|
|
},
|
|
NotBefore: now.UTC(),
|
|
NotAfter: now.Add(duration365d * 10).UTC(),
|
|
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
|
|
BasicConstraintsValid: true,
|
|
IsCA: true,
|
|
}
|
|
|
|
certDERBytes, err := x509.CreateCertificate(cryptorand.Reader, &tmpl, &tmpl, key.Public(), key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return x509.ParseCertificate(certDERBytes)
|
|
}
|
|
|
|
// NewSignedCert creates a signed certificate using the given CA certificate and key
|
|
func NewSignedCert(cfg Config, key crypto.Signer, caCert *x509.Certificate, caKey crypto.Signer) (*x509.Certificate, error) {
|
|
serial, err := rand.Int(rand.Reader, new(big.Int).SetInt64(math.MaxInt64))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(cfg.CommonName) == 0 {
|
|
return nil, errors.New("must specify a CommonName")
|
|
}
|
|
if len(cfg.Usages) == 0 {
|
|
return nil, errors.New("must specify at least one ExtKeyUsage")
|
|
}
|
|
|
|
certTmpl := x509.Certificate{
|
|
Subject: pkix.Name{
|
|
CommonName: cfg.CommonName,
|
|
Organization: cfg.Organization,
|
|
},
|
|
DNSNames: cfg.AltNames.DNSNames,
|
|
IPAddresses: cfg.AltNames.IPs,
|
|
SerialNumber: serial,
|
|
NotBefore: caCert.NotBefore,
|
|
NotAfter: time.Now().Add(duration365d).UTC(),
|
|
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
|
|
ExtKeyUsage: cfg.Usages,
|
|
}
|
|
certDERBytes, err := x509.CreateCertificate(cryptorand.Reader, &certTmpl, caCert, key.Public(), caKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return x509.ParseCertificate(certDERBytes)
|
|
}
|
|
|
|
// MakeEllipticPrivateKeyPEM creates an ECDSA private key
|
|
func MakeEllipticPrivateKeyPEM() ([]byte, error) {
|
|
privateKey, err := ecdsa.GenerateKey(elliptic.P256(), cryptorand.Reader)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
derBytes, err := x509.MarshalECPrivateKey(privateKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
privateKeyPemBlock := &pem.Block{
|
|
Type: ECPrivateKeyBlockType,
|
|
Bytes: derBytes,
|
|
}
|
|
return pem.EncodeToMemory(privateKeyPemBlock), nil
|
|
}
|
|
|
|
// GenerateSelfSignedCertKey creates a self-signed certificate and key for the given host.
|
|
// Host may be an IP or a DNS name
|
|
// You may also specify additional subject alt names (either ip or dns names) for the certificate.
|
|
func GenerateSelfSignedCertKey(host string, alternateIPs []net.IP, alternateDNS []string) ([]byte, []byte, error) {
|
|
return GenerateSelfSignedCertKeyWithFixtures(host, alternateIPs, alternateDNS, "")
|
|
}
|
|
|
|
// GenerateSelfSignedCertKeyWithFixtures creates a self-signed certificate and key for the given host.
|
|
// Host may be an IP or a DNS name. You may also specify additional subject alt names (either ip or dns names)
|
|
// for the certificate.
|
|
//
|
|
// If fixtureDirectory is non-empty, it is a directory path which can contain pre-generated certs. The format is:
|
|
// <host>_<ip>-<ip>_<alternateDNS>-<alternateDNS>.crt
|
|
// <host>_<ip>-<ip>_<alternateDNS>-<alternateDNS>.key
|
|
// Certs/keys not existing in that directory are created.
|
|
func GenerateSelfSignedCertKeyWithFixtures(host string, alternateIPs []net.IP, alternateDNS []string, fixtureDirectory string) ([]byte, []byte, error) {
|
|
validFrom := time.Now().Add(-time.Hour) // valid an hour earlier to avoid flakes due to clock skew
|
|
maxAge := time.Hour * 24 * 365 // one year self-signed certs
|
|
|
|
baseName := fmt.Sprintf("%s_%s_%s", host, strings.Join(ipsToStrings(alternateIPs), "-"), strings.Join(alternateDNS, "-"))
|
|
certFixturePath := path.Join(fixtureDirectory, baseName+".crt")
|
|
keyFixturePath := path.Join(fixtureDirectory, baseName+".key")
|
|
if len(fixtureDirectory) > 0 {
|
|
cert, err := ioutil.ReadFile(certFixturePath)
|
|
if err == nil {
|
|
key, err := ioutil.ReadFile(keyFixturePath)
|
|
if err == nil {
|
|
return cert, key, nil
|
|
}
|
|
return nil, nil, fmt.Errorf("cert %s can be read, but key %s cannot: %v", certFixturePath, keyFixturePath, err)
|
|
}
|
|
maxAge = 100 * time.Hour * 24 * 365 // 100 years fixtures
|
|
}
|
|
|
|
caKey, err := rsa.GenerateKey(cryptorand.Reader, 2048)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
caTemplate := x509.Certificate{
|
|
SerialNumber: big.NewInt(1),
|
|
Subject: pkix.Name{
|
|
CommonName: fmt.Sprintf("%s-ca@%d", host, time.Now().Unix()),
|
|
},
|
|
NotBefore: validFrom,
|
|
NotAfter: validFrom.Add(maxAge),
|
|
|
|
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
|
|
BasicConstraintsValid: true,
|
|
IsCA: true,
|
|
}
|
|
|
|
caDERBytes, err := x509.CreateCertificate(cryptorand.Reader, &caTemplate, &caTemplate, &caKey.PublicKey, caKey)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
caCertificate, err := x509.ParseCertificate(caDERBytes)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
priv, err := rsa.GenerateKey(cryptorand.Reader, 2048)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
template := x509.Certificate{
|
|
SerialNumber: big.NewInt(2),
|
|
Subject: pkix.Name{
|
|
CommonName: fmt.Sprintf("%s@%d", host, time.Now().Unix()),
|
|
},
|
|
NotBefore: validFrom,
|
|
NotAfter: validFrom.Add(maxAge),
|
|
|
|
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
|
|
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
|
|
BasicConstraintsValid: true,
|
|
}
|
|
|
|
if ip := net.ParseIP(host); ip != nil {
|
|
template.IPAddresses = append(template.IPAddresses, ip)
|
|
} else {
|
|
template.DNSNames = append(template.DNSNames, host)
|
|
}
|
|
|
|
template.IPAddresses = append(template.IPAddresses, alternateIPs...)
|
|
template.DNSNames = append(template.DNSNames, alternateDNS...)
|
|
|
|
derBytes, err := x509.CreateCertificate(cryptorand.Reader, &template, caCertificate, &priv.PublicKey, caKey)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
// Generate cert, followed by ca
|
|
certBuffer := bytes.Buffer{}
|
|
if err := pem.Encode(&certBuffer, &pem.Block{Type: CertificateBlockType, Bytes: derBytes}); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
if err := pem.Encode(&certBuffer, &pem.Block{Type: CertificateBlockType, Bytes: caDERBytes}); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
// Generate key
|
|
keyBuffer := bytes.Buffer{}
|
|
if err := pem.Encode(&keyBuffer, &pem.Block{Type: RSAPrivateKeyBlockType, Bytes: x509.MarshalPKCS1PrivateKey(priv)}); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
if len(fixtureDirectory) > 0 {
|
|
if err := ioutil.WriteFile(certFixturePath, certBuffer.Bytes(), 0644); err != nil {
|
|
return nil, nil, fmt.Errorf("failed to write cert fixture to %s: %v", certFixturePath, err)
|
|
}
|
|
if err := ioutil.WriteFile(keyFixturePath, keyBuffer.Bytes(), 0644); err != nil {
|
|
return nil, nil, fmt.Errorf("failed to write key fixture to %s: %v", certFixturePath, err)
|
|
}
|
|
}
|
|
|
|
return certBuffer.Bytes(), keyBuffer.Bytes(), nil
|
|
}
|
|
|
|
func ipsToStrings(ips []net.IP) []string {
|
|
ss := make([]string, 0, len(ips))
|
|
for _, ip := range ips {
|
|
ss = append(ss, ip.String())
|
|
}
|
|
return ss
|
|
}
|