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Protect against simultaneous generation of certificates.
This commit is contained in:
parent
c19b356e54
commit
b3727824b3
1 changed files with 72 additions and 30 deletions
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@ -10,6 +10,7 @@ import (
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"math/big"
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"os"
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"path/filepath"
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"sync"
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"sync/atomic"
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"time"
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)
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@ -20,9 +21,14 @@ type certInfo struct {
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certTime time.Time
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}
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// certMu protects writing to certificate
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var certMu sync.Mutex
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// certificate holds our current certificate, of type certInfo
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var certificate atomic.Value
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func generateCertificate(dataDir string) (tls.Certificate, error) {
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// generateCertificate generates a self-signed certficate
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func generateCertificate() (tls.Certificate, error) {
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priv, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return tls.Certificate{}, err
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@ -53,7 +59,7 @@ func generateCertificate(dataDir string) (tls.Certificate, error) {
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}, nil
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}
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func fileTime(filename string) time.Time {
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func modTime(filename string) time.Time {
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fi, err := os.Stat(filename)
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if err != nil {
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if !os.IsNotExist(err) {
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@ -64,40 +70,76 @@ func fileTime(filename string) time.Time {
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return fi.ModTime()
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}
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func getCertificate(dataDir string) (*tls.Certificate, error) {
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// loadCertificate returns the current certificate if it is still valid.
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func loadCertificate(certFile string, certTime time.Time, keyFile string, keyTime time.Time) *certInfo {
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info, ok := certificate.Load().(*certInfo)
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if !ok {
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return nil
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}
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if !info.certTime.Equal(certTime) || !info.keyTime.Equal(keyTime) {
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return nil
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}
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return info
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}
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// storeCertificate returns the current certificate if it is still valid,
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// and either reads or generates a new one otherwise.
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func storeCertificate(certFile string, certTime time.Time, keyFile string, keyTime time.Time) (info *certInfo, err error) {
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certMu.Lock()
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defer certMu.Unlock()
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// the certificate may have been updated since we checked
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info = loadCertificate(certFile, certTime, keyFile, keyTime)
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if info != nil {
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return
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}
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var cert tls.Certificate
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nocert := certTime.Equal(time.Time{})
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nokey := keyTime.Equal(time.Time{})
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if nocert != nokey {
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err = errors.New("only one of cert.pem and key.pem exists")
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return
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} else if nokey {
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log.Printf("Generating self-signed certificate")
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cert, err = generateCertificate()
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if err != nil {
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return
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}
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} else {
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cert, err = tls.LoadX509KeyPair(certFile, keyFile)
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if err != nil {
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return
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}
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}
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info = &certInfo{
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certificate: &cert,
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certTime: certTime,
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keyTime: keyTime,
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}
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certificate.Store(info)
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return
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}
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func getCertificate(dataDir string) (*tls.Certificate, error) {
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certFile := filepath.Join(dataDir, "cert.pem")
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keyFile := filepath.Join(dataDir, "key.pem")
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certTime := fileTime(certFile)
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keyTime := fileTime(keyFile)
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certTime := modTime(certFile)
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keyTime := modTime(keyFile)
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if !ok || !info.certTime.Equal(certTime) || !info.keyTime.Equal(keyTime) {
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var cert tls.Certificate
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nocert := certTime.Equal(time.Time{})
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nokey := keyTime.Equal(time.Time{})
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if nocert != nokey {
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return nil, errors.New("only one of cert.pem and key.pem exists")
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} else if nokey {
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log.Printf("Generating self-signed certificate")
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var err error
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cert, err = generateCertificate(dataDir)
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if err != nil {
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return nil, err
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}
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} else {
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var err error
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cert, err = tls.LoadX509KeyPair(certFile, keyFile)
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if err != nil {
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return nil, err
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}
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info := loadCertificate(certFile, certTime, keyFile, keyTime)
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if info == nil {
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var err error
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info, err = storeCertificate(
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certFile, certTime, keyFile, keyTime,
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)
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if info == nil || err != nil {
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return nil, err
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}
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info = &certInfo{
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certificate: &cert,
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certTime: certTime,
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keyTime: keyTime,
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}
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certificate.Store(info)
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}
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return info.certificate, nil
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}
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