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proxyPool/genKey.go

311 lines
9.1 KiB

// Package keyman provides convenience APIs around Go's built-in crypto APIs.
package main
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"io/ioutil"
"math/big"
"net"
"os"
"time"
"listome.com/log"
)
const (
PEM_HEADER_PRIVATE_KEY = "RSA PRIVATE KEY"
PEM_HEADER_PUBLIC_KEY = "RSA PRIVATE KEY"
PEM_HEADER_CERTIFICATE = "CERTIFICATE"
)
var (
tenYearsFromToday = time.Now().AddDate(10, 0, 0)
)
// PrivateKey is a convenience wrapper for rsa.PrivateKey
type PrivateKey struct {
rsaKey *rsa.PrivateKey
}
// Certificate is a convenience wrapper for x509.Certificate
type Certificate struct {
cert *x509.Certificate
derBytes []byte
}
/*******************************************************************************
* Private Key Functions
******************************************************************************/
// GeneratePK generates a PrivateKey with a specified size in bits.
func GeneratePK(bits int) (key *PrivateKey, err error) {
var rsaKey *rsa.PrivateKey
rsaKey, err = rsa.GenerateKey(rand.Reader, bits)
if err == nil {
key = &PrivateKey{rsaKey: rsaKey}
}
return
}
// LoadPKFromFile loads a PEM-encoded PrivateKey from a file
func LoadPKFromFile(filename string) (key *PrivateKey, err error) {
privateKeyData, err := ioutil.ReadFile(filename)
if err != nil {
if os.IsNotExist(err) {
return nil, err
}
return nil, fmt.Errorf("Unable to read private key file from file %s: %s", filename, err)
}
block, _ := pem.Decode(privateKeyData)
if block == nil {
return nil, fmt.Errorf("Unable to decode PEM encoded private key data: %s", err)
}
rsaKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("Unable to decode X509 private key data: %s", err)
}
return &PrivateKey{rsaKey: rsaKey}, nil
}
// PEMEncoded encodes the PrivateKey in PEM
func (key *PrivateKey) PEMEncoded() (pemBytes []byte) {
return pem.EncodeToMemory(key.pemBlock())
}
// WriteToFile writes the PEM-encoded PrivateKey to the given file
func (key *PrivateKey) WriteToFile(filename string) (err error) {
keyOut, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return fmt.Errorf("Failed to open %s for writing: %s", filename, err)
}
if err := pem.Encode(keyOut, key.pemBlock()); err != nil {
return fmt.Errorf("Unable to PEM encode private key: %s", err)
}
if err := keyOut.Close(); err != nil {
log.Debugf("Unable to close file: %v", err)
}
return
}
func (key *PrivateKey) pemBlock() *pem.Block {
return &pem.Block{Type: PEM_HEADER_PRIVATE_KEY, Bytes: x509.MarshalPKCS1PrivateKey(key.rsaKey)}
}
/*******************************************************************************
* Certificate Functions
******************************************************************************/
/*
Certificate() generates a certificate for the Public Key of the given PrivateKey
based on the given template and signed by the given issuer. If issuer is nil,
the generated certificate is self-signed.
*/
func (key *PrivateKey) Certificate(template *x509.Certificate, issuer *Certificate) (*Certificate, error) {
return key.CertificateForKey(template, issuer, &key.rsaKey.PublicKey)
}
/*
CertificateForKey() generates a certificate for the given Public Key based on
the given template and signed by the given issuer. If issuer is nil, the
generated certificate is self-signed.
*/
func (key *PrivateKey) CertificateForKey(template *x509.Certificate, issuer *Certificate, publicKey interface{}) (*Certificate, error) {
var issuerCert *x509.Certificate
if issuer == nil {
// Note - for self-signed certificates, we include the host's external IP address
issuerCert = template
} else {
issuerCert = issuer.cert
}
derBytes, err := x509.CreateCertificate(
rand.Reader, // secure entropy
template, // the template for the new cert
issuerCert, // cert that's signing this cert
publicKey, // public key
key.rsaKey, // private key
)
if err != nil {
return nil, err
}
return bytesToCert(derBytes)
}
// TLSCertificateFor generates a certificate useful for TLS use based on the
// given parameters. These certs are usable for key encipherment and digital
// signatures.
//
// organization: the org name for the cert.
// name: used as the common name for the cert. If name is an IP
// address, it is also added as an IP SAN.
// validUntil: time at which certificate expires
// isCA: whether or not this cert is a CA
// issuer: the certificate which is issuing the new cert. If nil, the
// new cert will be a self-signed CA certificate.
//
func (key *PrivateKey) TLSCertificateFor(
organization string,
name string,
validUntil time.Time,
isCA bool,
issuer *Certificate) (cert *Certificate, err error) {
template := &x509.Certificate{
SerialNumber: new(big.Int).SetInt64(int64(time.Now().UnixNano())),
Subject: pkix.Name{
Organization: []string{organization},
CommonName: name,
},
NotBefore: time.Now().AddDate(0, -1, 0),
NotAfter: validUntil,
BasicConstraintsValid: true,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
}
// If name is an ip address, add it as an IP SAN
ip := net.ParseIP(name)
if ip != nil {
template.IPAddresses = []net.IP{ip}
}
isSelfSigned := issuer == nil
if isSelfSigned {
template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth}
}
// If it's a CA, add certificate signing
if isCA {
template.KeyUsage = template.KeyUsage | x509.KeyUsageCertSign
template.IsCA = true
}
cert, err = key.Certificate(template, issuer)
return
}
// LoadCertificateFromFile loads a Certificate from a PEM-encoded file
func LoadCertificateFromFile(filename string) (*Certificate, error) {
certificateData, err := ioutil.ReadFile(filename)
if err != nil {
if os.IsNotExist(err) {
return nil, err
}
return nil, fmt.Errorf("Unable to read certificate file from disk: %s", err)
}
return LoadCertificateFromPEMBytes(certificateData)
}
// LoadCertificateFromPEMBytes loads a Certificate from a byte array in PEM
// format
func LoadCertificateFromPEMBytes(pemBytes []byte) (*Certificate, error) {
block, _ := pem.Decode(pemBytes)
if block == nil {
return nil, fmt.Errorf("Unable to decode PEM encoded certificate")
}
return bytesToCert(block.Bytes)
}
// LoadCertificateFromX509 loads a Certificate from an x509.Certificate
func LoadCertificateFromX509(cert *x509.Certificate) (*Certificate, error) {
pemBytes := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Headers: nil,
Bytes: cert.Raw,
})
return LoadCertificateFromPEMBytes(pemBytes)
}
// X509 returns the x509 certificate underlying this Certificate
func (cert *Certificate) X509() *x509.Certificate {
return cert.cert
}
// PEMEncoded encodes the Certificate in PEM
func (cert *Certificate) PEMEncoded() (pemBytes []byte) {
return pem.EncodeToMemory(cert.pemBlock())
}
// WriteToFile writes the PEM-encoded Certificate to a file.
func (cert *Certificate) WriteToFile(filename string) (err error) {
certOut, err := os.Create(filename)
if err != nil {
return fmt.Errorf("Failed to open %s for writing: %s", filename, err)
}
defer func() {
if err := certOut.Close(); err != nil {
log.Debugf("Unable to close file: %v", err)
}
}()
return pem.Encode(certOut, cert.pemBlock())
}
func (cert *Certificate) WriteToTempFile() (name string, err error) {
// Create a temp file containing the certificate
tempFile, err := ioutil.TempFile("", "tempCert")
if err != nil {
return "", fmt.Errorf("Unable to create temp file: %s", err)
}
name = tempFile.Name()
err = cert.WriteToFile(name)
if err != nil {
return "", fmt.Errorf("Unable to save certificate to temp file: %s", err)
}
return
}
// WriteToDERFile writes the DER-encoded Certificate to a file.
func (cert *Certificate) WriteToDERFile(filename string) (err error) {
certOut, err := os.Create(filename)
if err != nil {
return fmt.Errorf("Failed to open %s for writing: %s", filename, err)
}
defer func() {
if err := certOut.Close(); err != nil {
log.Debugf("Unable to close file: %v", err)
}
}()
_, err = certOut.Write(cert.derBytes)
return err
}
// PoolContainingCert creates a pool containing this cert.
func (cert *Certificate) PoolContainingCert() *x509.CertPool {
pool := x509.NewCertPool()
pool.AddCert(cert.cert)
return pool
}
// PoolContainingCerts constructs a CertPool containing all of the given certs
// (PEM encoded).
func PoolContainingCerts(certs ...string) (*x509.CertPool, error) {
pool := x509.NewCertPool()
for _, cert := range certs {
c, err := LoadCertificateFromPEMBytes([]byte(cert))
if err != nil {
return nil, err
}
pool.AddCert(c.cert)
}
return pool, nil
}
func (cert *Certificate) ExpiresBefore(time time.Time) bool {
return cert.cert.NotAfter.Before(time)
}
func bytesToCert(derBytes []byte) (*Certificate, error) {
cert, err := x509.ParseCertificate(derBytes)
if err != nil {
return nil, err
}
return &Certificate{cert, derBytes}, nil
}
func (cert *Certificate) pemBlock() *pem.Block {
return &pem.Block{Type: PEM_HEADER_CERTIFICATE, Bytes: cert.derBytes}
}