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Merge pull request FeatureBaseDB#2069 from codysoyland/tls-autoreload
Auto-reload TLS certificates on SIGHUP
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| // Copyright 2017 Pilosa Corp. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // 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" | ||
| "io/ioutil" | ||
| "log" | ||
| "os" | ||
| "os/signal" | ||
| "sync" | ||
| "syscall" | ||
|
|
||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| type keypairReloader struct { | ||
| certMu sync.RWMutex | ||
| cert *tls.Certificate | ||
| certPath string | ||
| keyPath string | ||
| } | ||
|
|
||
| func NewKeypairReloader(certPath, keyPath string, logger *log.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.Printf("Received SIGHUP, reloading TLS certificate and key from %q and %q", certPath, keyPath) | ||
| if err := result.maybeReload(); err != nil { | ||
| logger.Printf("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 GetTLSConfig(tlsConfig *TLSConfig, logger *log.Logger) (TLSConfig *tls.Config, err error) { | ||
| if tlsConfig.CertificatePath != "" && tlsConfig.CertificateKeyPath != "" { | ||
| 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(), | ||
| } | ||
| if tlsConfig.CACertPath != "" { | ||
| b, err := ioutil.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 | ||
| } |