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reload.go
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reload.go
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package reload
import (
"crypto/tls"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"sync"
"github.com/hashicorp/errwrap"
)
// ReloadFunc are functions that are called when a reload is requested
type ReloadFunc func(map[string]interface{}) error
// CertificateGetter satisfies ReloadFunc and its GetCertificate method
// satisfies the tls.GetCertificate function signature. Currently it does not
// allow changing paths after the fact.
type CertificateGetter struct {
sync.RWMutex
cert *tls.Certificate
certFile string
keyFile string
passphrase string
}
func NewCertificateGetter(certFile, keyFile, passphrase string) *CertificateGetter {
return &CertificateGetter{
certFile: certFile,
keyFile: keyFile,
passphrase: passphrase,
}
}
func (cg *CertificateGetter) Reload(_ map[string]interface{}) error {
certPEMBlock, err := ioutil.ReadFile(cg.certFile)
if err != nil {
return err
}
keyPEMBlock, err := ioutil.ReadFile(cg.keyFile)
if err != nil {
return err
}
// Check for encrypted pem block
keyBlock, _ := pem.Decode(keyPEMBlock)
if keyBlock == nil {
return errors.New("decoded PEM is blank")
}
if x509.IsEncryptedPEMBlock(keyBlock) {
keyBlock.Bytes, err = x509.DecryptPEMBlock(keyBlock, []byte(cg.passphrase))
if err != nil {
return errwrap.Wrapf("Decrypting PEM block failed {{err}}", err)
}
keyPEMBlock = pem.EncodeToMemory(keyBlock)
}
cert, err := tls.X509KeyPair(certPEMBlock, keyPEMBlock)
if err != nil {
return err
}
cg.Lock()
defer cg.Unlock()
cg.cert = &cert
return nil
}
func (cg *CertificateGetter) GetCertificate(clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
cg.RLock()
defer cg.RUnlock()
if cg.cert == nil {
return nil, fmt.Errorf("nil certificate")
}
return cg.cert, nil
}