Add NewMockBrokerListener() so that it's possible to test TLS connections

client_tls_test.go

@@ -0,0 +1,206 @@
+package sarama
+
+import (
+	"math/big"
+	"net"
+	"testing"
+	"time"
+
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+)
+
+func TestTLS(t *testing.T) {
+	cakey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	clientkey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	hostkey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	nvb := time.Now().Add(-1 * time.Hour)
+	nva := time.Now().Add(1 * time.Hour)
+
+	caTemplate := &x509.Certificate{
+		Subject:      pkix.Name{CommonName: "ca"},
+		Issuer:       pkix.Name{CommonName: "ca"},
+		SerialNumber: big.NewInt(0),
+		NotAfter:     nva,
+		NotBefore:    nvb,
+		IsCA:         true,
+		BasicConstraintsValid: true,
+		KeyUsage:              x509.KeyUsageCertSign,
+	}
+	caDer, err := x509.CreateCertificate(rand.Reader, caTemplate, caTemplate, &cakey.PublicKey, cakey)
+	if err != nil {
+		t.Fatal(err)
+	}
+	caFinalCert, err := x509.ParseCertificate(caDer)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	hostDer, err := x509.CreateCertificate(rand.Reader, &x509.Certificate{
+		Subject:      pkix.Name{CommonName: "host"},
+		Issuer:       pkix.Name{CommonName: "ca"},
+		IPAddresses:  []net.IP{net.IPv4(127, 0, 0, 1)},
+		SerialNumber: big.NewInt(0),
+		NotAfter:     nva,
+		NotBefore:    nvb,
+		ExtKeyUsage:  []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+	}, caFinalCert, &hostkey.PublicKey, cakey)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	clientDer, err := x509.CreateCertificate(rand.Reader, &x509.Certificate{
+		Subject:      pkix.Name{CommonName: "client"},
+		Issuer:       pkix.Name{CommonName: "ca"},
+		SerialNumber: big.NewInt(0),
+		NotAfter:     nva,
+		NotBefore:    nvb,
+		ExtKeyUsage:  []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
+	}, caFinalCert, &clientkey.PublicKey, cakey)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	pool := x509.NewCertPool()
+	pool.AddCert(caFinalCert)
+
+	systemCerts, err := x509.SystemCertPool()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Keep server the same - it's the client that we're testing
+	serverTLSConfig := &tls.Config{
+		Certificates: []tls.Certificate{tls.Certificate{
+			Certificate: [][]byte{hostDer},
+			PrivateKey:  hostkey,
+		}},
+		ClientAuth: tls.RequireAndVerifyClientCert,
+		ClientCAs:  pool,
+	}
+
+	for _, tc := range []struct {
+		Succeed        bool
+		Server, Client *tls.Config
+	}{
+		{ // Verify client fails if wrong CA cert pool is specified
+			Succeed: false,
+			Server:  serverTLSConfig,
+			Client: &tls.Config{
+				RootCAs: systemCerts,
+				Certificates: []tls.Certificate{tls.Certificate{
+					Certificate: [][]byte{clientDer},
+					PrivateKey:  clientkey,
+				}},
+			},
+		},
+		{ // Verify client fails if wrong key is specified
+			Succeed: false,
+			Server:  serverTLSConfig,
+			Client: &tls.Config{
+				RootCAs: pool,
+				Certificates: []tls.Certificate{tls.Certificate{
+					Certificate: [][]byte{clientDer},
+					PrivateKey:  hostkey,
+				}},
+			},
+		},
+		{ // Verify client fails if wrong cert is specified
+			Succeed: false,
+			Server:  serverTLSConfig,
+			Client: &tls.Config{
+				RootCAs: pool,
+				Certificates: []tls.Certificate{tls.Certificate{
+					Certificate: [][]byte{hostDer},
+					PrivateKey:  clientkey,
+				}},
+			},
+		},
+		{ // Verify client fails if no CAs are specified
+			Succeed: false,
+			Server:  serverTLSConfig,
+			Client: &tls.Config{
+				Certificates: []tls.Certificate{tls.Certificate{
+					Certificate: [][]byte{clientDer},
+					PrivateKey:  clientkey,
+				}},
+			},
+		},
+		{ // Verify client fails if no keys are specified
+			Succeed: false,
+			Server:  serverTLSConfig,
+			Client: &tls.Config{
+				RootCAs: pool,
+			},
+		},
+		{ // Finally, verify it all works happily with client and server cert in place
+			Succeed: true,
+			Server:  serverTLSConfig,
+			Client: &tls.Config{
+				RootCAs: pool,
+				Certificates: []tls.Certificate{tls.Certificate{
+					Certificate: [][]byte{clientDer},
+					PrivateKey:  clientkey,
+				}},
+			},
+		},
+	} {
+		doListenerTLSTest(t, tc.Succeed, tc.Server, tc.Client)
+	}
+}
+
+func doListenerTLSTest(t *testing.T, expectSuccess bool, serverConfig, clientConfig *tls.Config) {
+	serverConfig.BuildNameToCertificate()
+	clientConfig.BuildNameToCertificate()
+
+	seedListener, err := tls.Listen("tcp", "127.0.0.1:0", serverConfig)
+	if err != nil {
+		t.Fatal("cannot open listener", err)
+	}
+
+	var childT *testing.T
+	if expectSuccess {
+		childT = t
+	} else {
+		childT = &testing.T{} // we want to swallow errors
+	}
+
+	seedBroker := NewMockBrokerListener(childT, 1, seedListener)
+	defer seedBroker.Close()
+
+	seedBroker.Returns(new(MetadataResponse))
+
+	config := NewConfig()
+	config.Net.TLS.Enable = true
+	config.Net.TLS.Config = clientConfig
+
+	client, err := NewClient([]string{seedBroker.Addr()}, config)
+	if err == nil {
+		safeClose(t, client)
+	}
+
+	if expectSuccess {
+		if err != nil {
+			t.Fatal(err)
+		}
+	} else {
+		if err == nil {
+			t.Fatal("expected failure")
+		}
+	}
+}

mockbroker.go

@@ -288,6 +288,15 @@ func NewMockBroker(t TestReporter, brokerID int32) *MockBroker {
 // NewMockBrokerAddr behaves like newMockBroker but listens on the address you give
 // it rather than just some ephemeral port.
 func NewMockBrokerAddr(t TestReporter, brokerID int32, addr string) *MockBroker {
+	listener, err := net.Listen("tcp", addr)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return NewMockBrokerListener(t, brokerID, listener)
+}
+
+// NewMockBrokerListener behaves like newMockBrokerAddr but accepts connections on the listener specified.
+func NewMockBrokerListener(t TestReporter, brokerID int32, listener net.Listener) *MockBroker {
 	var err error
 
 	broker := &MockBroker{
@@ -296,13 +305,10 @@ func NewMockBrokerAddr(t TestReporter, brokerID int32, addr string) *MockBroker
 		t:            t,
 		brokerID:     brokerID,
 		expectations: make(chan encoder, 512),
+		listener:     listener,
 	}
 	broker.handler = broker.defaultRequestHandler
 
-	broker.listener, err = net.Listen("tcp", addr)
-	if err != nil {
-		t.Fatal(err)
-	}
 	Logger.Printf("*** mockbroker/%d listening on %s\n", brokerID, broker.listener.Addr().String())
 	_, portStr, err := net.SplitHostPort(broker.listener.Addr().String())
 	if err != nil {