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tls_util.go
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tls_util.go
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package server
import (
"bytes"
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"math/big"
"net"
"os"
"time"
"github.com/hashicorp/vault/sdk/helper/certutil"
)
type CaCert struct {
PEM string
Template *x509.Certificate
Signer crypto.Signer
}
// GenerateCert creates a new leaf cert from provided CA template and signer
func GenerateCert(caCertTemplate *x509.Certificate, caSigner crypto.Signer) (string, string, error) {
// Create the private key
signer, keyPEM, err := privateKey()
if err != nil {
return "", "", fmt.Errorf("error generating private key for server certificate: %v", err)
}
// The serial number for the cert
sn, err := serialNumber()
if err != nil {
return "", "", fmt.Errorf("error generating serial number: %v", err)
}
signerKeyId, err := certutil.GetSubjKeyID(signer)
if err != nil {
return "", "", fmt.Errorf("error getting subject key id from key: %v", err)
}
hostname, err := os.Hostname()
if err != nil {
return "", "", fmt.Errorf("error getting hostname: %v", err)
}
if hostname == "" {
hostname = "localhost"
}
// Create the leaf cert
template := x509.Certificate{
SerialNumber: sn,
Subject: pkix.Name{CommonName: hostname},
KeyUsage: x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
NotAfter: time.Now().Add(365 * 24 * time.Hour),
NotBefore: time.Now().Add(-1 * time.Minute),
IPAddresses: []net.IP{net.ParseIP("127.0.0.1")},
DNSNames: []string{"localhost", "localhost4", "localhost6", "localhost.localdomain"},
AuthorityKeyId: caCertTemplate.AuthorityKeyId,
SubjectKeyId: signerKeyId,
}
bs, err := x509.CreateCertificate(
rand.Reader, &template, caCertTemplate, signer.Public(), caSigner)
if err != nil {
return "", "", fmt.Errorf("error creating server certificate: %v", err)
}
var buf bytes.Buffer
err = pem.Encode(&buf, &pem.Block{Type: "CERTIFICATE", Bytes: bs})
if err != nil {
return "", "", fmt.Errorf("error encoding server certificate: %v", err)
}
return buf.String(), keyPEM, nil
}
// GenerateCA generates a new self-signed CA cert and returns a
// CaCert struct containing the PEM encoded cert,
// X509 Certificate Template, and crypto.Signer
func GenerateCA() (*CaCert, error) {
// Create the private key we'll use for this CA cert.
signer, _, err := privateKey()
if err != nil {
return nil, fmt.Errorf("error generating private key for CA: %v", err)
}
signerKeyId, err := certutil.GetSubjKeyID(signer)
if err != nil {
return nil, fmt.Errorf("error getting subject key id from key: %v", err)
}
// The serial number for the cert
sn, err := serialNumber()
if err != nil {
return nil, fmt.Errorf("error generating serial number: %v", err)
}
// Create the CA cert
template := x509.Certificate{
SerialNumber: sn,
Subject: pkix.Name{CommonName: "Vault Dev CA"},
BasicConstraintsValid: true,
KeyUsage: x509.KeyUsageCertSign,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
IsCA: true,
NotAfter: time.Now().Add(10 * 365 * 24 * time.Hour),
NotBefore: time.Now().Add(-1 * time.Minute),
AuthorityKeyId: signerKeyId,
SubjectKeyId: signerKeyId,
IPAddresses: []net.IP{net.ParseIP("127.0.0.1")},
}
bs, err := x509.CreateCertificate(
rand.Reader, &template, &template, signer.Public(), signer)
if err != nil {
return nil, fmt.Errorf("error creating CA certificate: %v", err)
}
var buf bytes.Buffer
err = pem.Encode(&buf, &pem.Block{Type: "CERTIFICATE", Bytes: bs})
if err != nil {
return nil, fmt.Errorf("error encoding CA certificate: %v", err)
}
return &CaCert{
PEM: buf.String(),
Template: &template,
Signer: signer,
}, nil
}
// privateKey returns a new ECDSA-based private key. Both a crypto.Signer
// and the key in PEM format are returned.
func privateKey() (crypto.Signer, string, error) {
pk, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return nil, "", err
}
bs, err := x509.MarshalECPrivateKey(pk)
if err != nil {
return nil, "", err
}
var buf bytes.Buffer
err = pem.Encode(&buf, &pem.Block{Type: "EC PRIVATE KEY", Bytes: bs})
if err != nil {
return nil, "", err
}
return pk, buf.String(), nil
}
// serialNumber generates a new random serial number.
func serialNumber() (*big.Int, error) {
return rand.Int(rand.Reader, (&big.Int{}).Exp(big.NewInt(2), big.NewInt(159), nil))
}