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certs.go
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certs.go
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// Copyright 2021 The OPA Authors. All rights reserved.
// Use of this source code is governed by an Apache2
// license that can be found in the LICENSE file.
package server
import (
"bytes"
"crypto/sha256"
"crypto/tls"
"io"
"os"
"time"
"github.com/meta-quick/opax/logging"
)
func (s *Server) getCertificate(h *tls.ClientHelloInfo) (*tls.Certificate, error) {
s.certMtx.RLock()
defer s.certMtx.RUnlock()
return s.cert, nil
}
func (s *Server) certLoop(logger logging.Logger) Loop {
return func() error {
for range time.NewTicker(s.certRefresh).C {
certHash, err := hash(s.certFile)
if err != nil {
logger.Info("Failed to refresh server certificate: %s.", err.Error())
continue
}
certKeyHash, err := hash(s.certKeyFile)
if err != nil {
logger.Info("Failed to refresh server certificate: %s.", err.Error())
continue
}
s.certMtx.Lock()
different := !bytes.Equal(s.certFileHash, certHash) ||
!bytes.Equal(s.certKeyFileHash, certKeyHash)
if different { // load and store
newCert, err := tls.LoadX509KeyPair(s.certFile, s.certKeyFile)
if err != nil {
logger.Info("Failed to refresh server certificate: %s.", err.Error())
s.certMtx.Unlock()
continue
}
s.cert = &newCert
s.certFileHash = certHash
s.certKeyFileHash = certKeyHash
logger.Debug("Refreshed server certificate.")
}
s.certMtx.Unlock()
}
return nil
}
}
func hash(file string) ([]byte, error) {
f, err := os.Open(file)
if err != nil {
return nil, err
}
defer f.Close()
h := sha256.New()
if _, err := io.Copy(h, f); err != nil {
return nil, err
}
return h.Sum(nil), nil
}