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/
tlsconfig.go
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/
tlsconfig.go
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// Copyright 2022 Molecula Corp. (DBA FeatureBase).
// SPDX-License-Identifier: Apache-2.0
//
// This file contains source code from bridge
// (https://github.com/robustirc/bridge); which is governed by the following
// license notice:
//
// Copyright © 2014-2015 The RobustIRC Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// * Neither the name of RobustIRC nor the names of contributors may be used
// to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package server
import (
"crypto/tls"
"crypto/x509"
"fmt"
"os"
"os/signal"
"sync"
"syscall"
"github.com/featurebasedb/featurebase/v3/logger"
"github.com/pkg/errors"
)
type keypairReloader struct {
certMu sync.RWMutex
cert *tls.Certificate
certPath string
keyPath string
}
func NewKeypairReloader(certPath, keyPath string, logger logger.Logger) (*keypairReloader, error) {
result := &keypairReloader{
certPath: certPath,
keyPath: keyPath,
}
cert, err := tls.LoadX509KeyPair(certPath, keyPath)
if err != nil {
return nil, err
}
result.cert = &cert
go func() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGHUP)
for range c {
logger.Infof("Received SIGHUP, reloading TLS certificate and key from %q and %q", certPath, keyPath)
if err := result.maybeReload(); err != nil {
logger.Printf("ERROR: Keeping old TLS certificate because the new one could not be loaded: %v", err)
}
}
}()
return result, nil
}
func (kpr *keypairReloader) maybeReload() error {
newCert, err := tls.LoadX509KeyPair(kpr.certPath, kpr.keyPath)
if err != nil {
return err
}
kpr.certMu.Lock()
defer kpr.certMu.Unlock()
kpr.cert = &newCert
return nil
}
func (kpr *keypairReloader) GetCertificateFunc() func(*tls.ClientHelloInfo) (*tls.Certificate, error) {
return func(clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
kpr.certMu.RLock()
defer kpr.certMu.RUnlock()
return kpr.cert, nil
}
}
func (kpr *keypairReloader) GetClientCertificateFunc() func(*tls.CertificateRequestInfo) (*tls.Certificate, error) {
return func(*tls.CertificateRequestInfo) (*tls.Certificate, error) {
kpr.certMu.RLock()
defer kpr.certMu.RUnlock()
return kpr.cert, nil
}
}
func GetTLSConfig(tlsConfig *TLSConfig, logger logger.Logger) (TLSConfig *tls.Config, err error) {
if tlsConfig == nil {
return nil, fmt.Errorf("cannot parse nil tls config")
}
hasCA := len(tlsConfig.CACertPath) > 0
hasCert := len(tlsConfig.CertificatePath) > 0 && len(tlsConfig.CertificateKeyPath) > 0
if hasCA && tlsConfig.SkipVerify {
return nil, fmt.Errorf("cannot specify root certificate and disable server certificate verification")
}
if hasCert && tlsConfig.SkipVerify {
return nil, fmt.Errorf("cannot specify TLS certificate and disable server certificate verification")
}
if hasCert {
kpr, err := NewKeypairReloader(tlsConfig.CertificatePath, tlsConfig.CertificateKeyPath, logger)
if err != nil {
return nil, errors.Wrap(err, "loading keypair")
}
TLSConfig = &tls.Config{
InsecureSkipVerify: tlsConfig.SkipVerify,
PreferServerCipherSuites: true,
MinVersion: tls.VersionTLS12,
GetCertificate: kpr.GetCertificateFunc(),
GetClientCertificate: kpr.GetClientCertificateFunc(),
}
if hasCA {
b, err := os.ReadFile(tlsConfig.CACertPath)
if err != nil {
return nil, errors.Wrap(err, "loading tls ca key")
}
certPool := x509.NewCertPool()
ok := certPool.AppendCertsFromPEM(b)
if !ok {
return nil, errors.New("error parsing CA certificate")
}
TLSConfig.ClientCAs = certPool
TLSConfig.RootCAs = certPool
}
if tlsConfig.EnableClientVerification {
TLSConfig.ClientAuth = tls.RequireAndVerifyClientCert
}
}
return TLSConfig, nil
}