Implement auto cert reloading (#5963)

pkg/certs/certs.go

@@ -0,0 +1,127 @@
+/*
+ * Minio Cloud Storage, (C) 2018 Minio, Inc.
+ *
+ * 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.
+ */
+
+package certs
+
+import (
+	"crypto/tls"
+	"sync"
+
+	"github.com/rjeczalik/notify"
+)
+
+// A Certs represents a certificate manager able to watch certificate
+// and key pairs for changes.
+type Certs struct {
+	sync.RWMutex
+	// user input params.
+	certFile string
+	keyFile  string
+	loadCert LoadX509KeyPairFunc
+
+	// points to the latest certificate.
+	cert tls.Certificate
+
+	// internal param to track for events, also
+	// used to close the watcher.
+	e chan notify.EventInfo
+}
+
+// LoadX509KeyPairFunc - provides a type for custom cert loader function.
+type LoadX509KeyPairFunc func(certFile, keyFile string) (tls.Certificate, error)
+
+// New initializes a new certs monitor.
+func New(certFile, keyFile string, loadCert LoadX509KeyPairFunc) (*Certs, error) {
+	c := &Certs{
+		certFile: certFile,
+		keyFile:  keyFile,
+		loadCert: loadCert,
+		// Make the channel buffered to ensure no event is dropped. Notify will drop
+		// an event if the receiver is not able to keep up the sending pace.
+		e: make(chan notify.EventInfo, 1),
+	}
+
+	if err := c.watch(); err != nil {
+		return nil, err
+	}
+
+	return c, nil
+}
+
+// watch starts watching for changes to the certificate
+// and key files. On any change the certificate and key
+// are reloaded. If there is an issue the loading will fail
+// and the old (if any) certificates and keys will continue
+// to be used.
+func (c *Certs) watch() (err error) {
+	defer func() {
+		if err != nil {
+			// Stop any watches previously setup after an error.
+			notify.Stop(c.e)
+		}
+	}()
+
+	if err = notify.Watch(c.certFile, c.e, eventWrite...); err != nil {
+		return err
+	}
+
+	if err = notify.Watch(c.keyFile, c.e, eventWrite...); err != nil {
+		return err
+	}
+	c.Lock()
+	c.cert, err = c.loadCert(c.certFile, c.keyFile)
+	c.Unlock()
+	if err != nil {
+		return err
+	}
+	go c.run()
+	return nil
+}
+
+func (c *Certs) run() {
+	for event := range c.e {
+		if isWriteEvent(event.Event()) {
+			cert, err := c.loadCert(c.certFile, c.keyFile)
+			if err != nil {
+				// ignore the error continue to use
+				// old certificates.
+				continue
+			}
+			c.Lock()
+			c.cert = cert
+			c.Unlock()
+		}
+	}
+}
+
+// GetCertificateFunc provides a GetCertificate type for custom client implementations.
+type GetCertificateFunc func(hello *tls.ClientHelloInfo) (*tls.Certificate, error)
+
+// GetCertificate returns the loaded certificate for use by
+// the TLSConfig fields GetCertificate field in a http.Server.
+func (c *Certs) GetCertificate(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
+	c.RLock()
+	defer c.RUnlock()
+	return &c.cert, nil
+}
+
+// Stop tells loader to stop watching for changes to the
+// certificate and key files.
+func (c *Certs) Stop() {
+	if c != nil {
+		notify.Stop(c.e)
+	}
+}

pkg/certs/certs_test.go

@@ -0,0 +1,124 @@
+/*
+ * Minio Cloud Storage, (C) 2018 Minio, Inc.
+ *
+ * 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.
+ */
+
+package certs_test
+
+import (
+	"crypto/tls"
+	"io"
+	"os"
+	"reflect"
+	"testing"
+	"time"
+
+	"github.com/minio/minio/pkg/certs"
+)
+
+func updateCerts(crt, key string) {
+	// ignore error handling
+	crtSource, _ := os.Open(crt)
+	defer crtSource.Close()
+	crtDest, _ := os.Create("server.crt")
+	defer crtDest.Close()
+	io.Copy(crtDest, crtSource)
+
+	keySource, _ := os.Open(key)
+	defer keySource.Close()
+	keyDest, _ := os.Create("server.key")
+	defer keyDest.Close()
+	io.Copy(keyDest, keySource)
+}
+
+func TestCertNew(t *testing.T) {
+	c, err := certs.New("server.crt", "server.key", tls.LoadX509KeyPair)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Stop()
+	hello := &tls.ClientHelloInfo{}
+	gcert, err := c.GetCertificate(hello)
+	if err != nil {
+		t.Fatal(err)
+	}
+	expectedCert, err := tls.LoadX509KeyPair("server.crt", "server.key")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(gcert.Certificate, expectedCert.Certificate) {
+		t.Error("certificate doesn't match expected certificate")
+	}
+	c, err = certs.New("server.crt", "server2.key", tls.LoadX509KeyPair)
+	if err == nil {
+		t.Fatal("Expected to fail but got success")
+	}
+}
+
+func TestValidPairAfterWrite(t *testing.T) {
+	expectedCert, err := tls.LoadX509KeyPair("server2.crt", "server2.key")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	c, err := certs.New("server.crt", "server.key", tls.LoadX509KeyPair)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Stop()
+
+	updateCerts("server2.crt", "server2.key")
+	defer updateCerts("server1.crt", "server1.key")
+
+	// Wait for the write event..
+	time.Sleep(200 * time.Millisecond)
+
+	hello := &tls.ClientHelloInfo{}
+	gcert, err := c.GetCertificate(hello)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !reflect.DeepEqual(gcert.Certificate, expectedCert.Certificate) {
+		t.Error("certificate doesn't match expected certificate")
+	}
+}
+
+func TestStop(t *testing.T) {
+	expectedCert, err := tls.LoadX509KeyPair("server2.crt", "server2.key")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	c, err := certs.New("server.crt", "server.key", tls.LoadX509KeyPair)
+	if err != nil {
+		t.Fatal(err)
+	}
+	c.Stop()
+
+	// No one is listening on the event, will be ignored and
+	// certificate will not be reloaded.
+	updateCerts("server2.crt", "server2.key")
+	defer updateCerts("server1.crt", "server1.key")
+
+	hello := &tls.ClientHelloInfo{}
+	gcert, err := c.GetCertificate(hello)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if reflect.DeepEqual(gcert.Certificate, expectedCert.Certificate) {
+		t.Error("certificate shouldn't match, but matched")
+	}
+}

pkg/certs/event.go

@@ -0,0 +1,31 @@
+/*
+ * Minio Cloud Storage, (C) 2018 Minio, Inc.
+ *
+ * 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.
+ */
+
+package certs
+
+import (
+	"github.com/rjeczalik/notify"
+)
+
+// isWriteEvent checks if the event returned is a write event
+func isWriteEvent(event notify.Event) bool {
+	for _, ev := range eventWrite {
+		if event&ev != 0 {
+			return true
+		}
+	}
+	return false
+}

pkg/certs/event_linux.go

@@ -0,0 +1,26 @@
+// +build linux
+
+/*
+ * Minio Cloud Storage, (C) 2018 Minio, Inc.
+ *
+ * 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.
+ */
+
+package certs
+
+import "github.com/rjeczalik/notify"
+
+var (
+	// eventWrite contains the notify events that will cause a write
+	eventWrite = []notify.Event{notify.InCloseWrite}
+)

pkg/certs/event_others.go

@@ -0,0 +1,26 @@
+// +build !linux
+
+/*
+ * Minio Cloud Storage, (C) 2018 Minio, Inc.
+ *
+ * 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.
+ */
+
+package certs
+
+import "github.com/rjeczalik/notify"
+
+var (
+	// eventWrite contains the notify events that will cause a write
+	eventWrite = []notify.Event{notify.Create, notify.Write}
+)

pkg/certs/server.crt

@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE-----
+MIIDqjCCApKgAwIBAgIJAOcv4FsrflS4MA0GCSqGSIb3DQEBCwUAMGoxCzAJBgNV
+BAYTAlVTMQswCQYDVQQIDAJDQTEVMBMGA1UEBwwMUmVkd29vZCBDaXR5MQ4wDAYD
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+s/zojgc5npE32/1n8og6gLcv7LIKelBfMhUrFTp7
+-----END CERTIFICATE-----

pkg/certs/server.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDPszxaYwn+mIz6
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+9eZwhS3H+Zb/693WbBDyH8L+
+-----END PRIVATE KEY-----

pkg/certs/server1.crt

@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE-----
+MIIDqjCCApKgAwIBAgIJAOcv4FsrflS4MA0GCSqGSIb3DQEBCwUAMGoxCzAJBgNV
+BAYTAlVTMQswCQYDVQQIDAJDQTEVMBMGA1UEBwwMUmVkd29vZCBDaXR5MQ4wDAYD
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+s/zojgc5npE32/1n8og6gLcv7LIKelBfMhUrFTp7
+-----END CERTIFICATE-----

pkg/certs/server1.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDPszxaYwn+mIz6
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+9eZwhS3H+Zb/693WbBDyH8L+
+-----END PRIVATE KEY-----

pkg/certs/server2.crt

@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
+MIIDYDCCAkigAwIBAgIJALIHkFXjtZ2yMA0GCSqGSIb3DQEBCwUAMEUxCzAJBgNV
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+bAd5VQ==
+-----END CERTIFICATE-----

pkg/certs/server2.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQD4tnz56oMfKgK3
+scZAiFkr5lqAPFfMnrtrZXzyz+scHfOGLV3qFrqrmxyWOYI2qPbnR+NJakNDiGyx
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+hVLY/tTp5ij0JVH/VgNOYlRZCIU83blLUmIonXmECyyh/SAX21JuMXram2KRdoi0
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+Y/VRervig2zlixnBc93zpZnXft12tnfD7PS6p298z0LYMOvqSdnVe2G9C6b70U4X
+bfIdF6mpvnGcwsWQiRQsGCsHnHC9SPO5og6b6ywk7HB2VuoG1pjM0pp2Iv4mZFdo
+3kIg5EndF8qmSck9SkffRvCyefDBv98pV8rMaet3AoGBALjlN2hLoNE5Cs5vTYH8
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+ms3FrNsnBbTczX+xJmndRnVRocdyON6u476VxAuz/dHSFFnZGXX+2lJse9xnWHUz
+OpSHUPq3TrUzhgZClE2ZKpNm
+-----END PRIVATE KEY-----