crypto/tls: extensions and Next Protocol Negotiation

Add support for TLS extensions in general and Next Protocol
Negotiation in particular.

R=rsc
CC=golang-dev
https://golang.org/cl/181045

src/pkg/crypto/tls/common.go

@@ -41,6 +41,7 @@ const (
 	typeServerHelloDone   uint8 = 14
 	typeClientKeyExchange uint8 = 16
 	typeFinished          uint8 = 20
+	typeNextProtocol      uint8 = 67 // Not IANA assigned
 )
 
 // TLS cipher suites.
@@ -53,10 +54,17 @@ var (
 	compressionNone uint8 = 0
 )
 
+// TLS extension numbers
+var (
+	extensionServerName   uint16 = 0
+	extensionNextProtoNeg uint16 = 13172 // not IANA assigned
+)
+
 type ConnectionState struct {
-	HandshakeComplete bool
+	HandshakeComplete  bool
-	CipherSuite       string
+	CipherSuite        string
-	Error             alertType
+	Error              alertType
+	NegotiatedProtocol string
 }
 
 // A Config structure is used to configure a TLS client or server. After one
@@ -68,6 +76,9 @@ type Config struct {
 	Time         func() int64
 	Certificates []Certificate
 	RootCAs      *CASet
+	// NextProtos is a list of supported, application level protocols.
+	// Currently only server-side handling is supported.
+	NextProtos []string
 }
 
 type Certificate struct {

src/pkg/crypto/tls/handshake_client.go

@@ -184,7 +184,7 @@ func (h *clientHandshake) loop(writeChan chan<- interface{}, controlChan chan<-
 		return
 	}
 
-	controlChan <- ConnectionState{true, "TLS_RSA_WITH_RC4_128_SHA", 0}
+	controlChan <- ConnectionState{HandshakeComplete: true, CipherSuite: "TLS_RSA_WITH_RC4_128_SHA"}
 
 	// This should just block forever.
 	_ = h.readHandshakeMsg()
@@ -218,7 +218,7 @@ func (h *clientHandshake) error(e alertType) {
 			for _ = range h.msgChan {
 			}
 		}()
-		h.controlChan <- ConnectionState{false, "", e}
+		h.controlChan <- ConnectionState{Error: e}
 		close(h.controlChan)
 		h.writeChan <- alert{alertLevelError, e}
 	}

src/pkg/crypto/tls/handshake_messages.go

@@ -4,6 +4,8 @@
 
 package tls
 
+import "strings"
+
 type clientHelloMsg struct {
 	raw                []byte
 	major, minor       uint8
@@ -11,6 +13,8 @@ type clientHelloMsg struct {
 	sessionId          []byte
 	cipherSuites       []uint16
 	compressionMethods []uint8
+	nextProtoNeg       bool
+	serverName         string
 }
 
 func (m *clientHelloMsg) marshal() []byte {
@@ -19,6 +23,20 @@ func (m *clientHelloMsg) marshal() []byte {
 	}
 
 	length := 2 + 32 + 1 + len(m.sessionId) + 2 + len(m.cipherSuites)*2 + 1 + len(m.compressionMethods)
+	numExtensions := 0
+	extensionsLength := 0
+	if m.nextProtoNeg {
+		numExtensions++
+	}
+	if len(m.serverName) > 0 {
+		extensionsLength += 5 + len(m.serverName)
+		numExtensions++
+	}
+	if numExtensions > 0 {
+		extensionsLength += 4 * numExtensions
+		length += 2 + extensionsLength
+	}
+
 	x := make([]byte, 4+length)
 	x[0] = typeClientHello
 	x[1] = uint8(length >> 16)
@@ -39,6 +57,53 @@ func (m *clientHelloMsg) marshal() []byte {
 	z := y[2+len(m.cipherSuites)*2:]
 	z[0] = uint8(len(m.compressionMethods))
 	copy(z[1:], m.compressionMethods)
+
+	z = z[1+len(m.compressionMethods):]
+	if numExtensions > 0 {
+		z[0] = byte(extensionsLength >> 8)
+		z[1] = byte(extensionsLength)
+		z = z[2:]
+	}
+	if m.nextProtoNeg {
+		z[0] = byte(extensionNextProtoNeg >> 8)
+		z[1] = byte(extensionNextProtoNeg)
+		// The length is always 0
+		z = z[4:]
+	}
+	if len(m.serverName) > 0 {
+		z[0] = byte(extensionServerName >> 8)
+		z[1] = byte(extensionServerName)
+		l := len(m.serverName) + 5
+		z[2] = byte(l >> 8)
+		z[3] = byte(l)
+		z = z[4:]
+
+		// RFC 3546, section 3.1
+		//
+		// struct {
+		//     NameType name_type;
+		//     select (name_type) {
+		//         case host_name: HostName;
+		//     } name;
+		// } ServerName;
+		//
+		// enum {
+		//     host_name(0), (255)
+		// } NameType;
+		//
+		// opaque HostName<1..2^16-1>;
+		//
+		// struct {
+		//     ServerName server_name_list<1..2^16-1>
+		// } ServerNameList;
+
+		z[1] = 1
+		z[3] = byte(len(m.serverName) >> 8)
+		z[4] = byte(len(m.serverName))
+		copy(z[5:], strings.Bytes(m.serverName))
+		z = z[l:]
+	}
+
 	m.raw = x
 
 	return x
@@ -82,7 +147,68 @@ func (m *clientHelloMsg) unmarshal(data []byte) bool {
 	}
 	m.compressionMethods = data[1 : 1+compressionMethodsLen]
 
-	// A ClientHello may be following by trailing data: RFC 4346 section 7.4.1.2
+	data = data[1+compressionMethodsLen:]
+
+	m.nextProtoNeg = false
+	m.serverName = ""
+
+	if len(data) == 0 {
+		// ClientHello is optionally followed by extension data
+		return true
+	}
+	if len(data) < 2 {
+		return false
+	}
+
+	extensionsLength := int(data[0])<<8 | int(data[1])
+	data = data[2:]
+	if extensionsLength != len(data) {
+		return false
+	}
+
+	for len(data) != 0 {
+		if len(data) < 4 {
+			return false
+		}
+		extension := uint16(data[0])<<8 | uint16(data[1])
+		length := int(data[2])<<8 | int(data[3])
+		data = data[4:]
+		if len(data) < length {
+			return false
+		}
+
+		switch extension {
+		case extensionServerName:
+			if length < 2 {
+				return false
+			}
+			numNames := int(data[0])<<8 | int(data[1])
+			d := data[2:]
+			for i := 0; i < numNames; i++ {
+				if len(d) < 3 {
+					return false
+				}
+				nameType := d[0]
+				nameLen := int(d[1])<<8 | int(d[2])
+				d = d[3:]
+				if len(d) < nameLen {
+					return false
+				}
+				if nameType == 0 {
+					m.serverName = string(d[0:nameLen])
+					break
+				}
+				d = d[nameLen:]
+			}
+		case extensionNextProtoNeg:
+			if length > 0 {
+				return false
+			}
+			m.nextProtoNeg = true
+		}
+		data = data[length:]
+	}
+
 	return true
 }
 
@@ -93,6 +219,8 @@ type serverHelloMsg struct {
 	sessionId         []byte
 	cipherSuite       uint16
 	compressionMethod uint8
+	nextProtoNeg      bool
+	nextProtos        []string
 }
 
 func (m *serverHelloMsg) marshal() []byte {
@@ -101,6 +229,23 @@ func (m *serverHelloMsg) marshal() []byte {
 	}
 
 	length := 38 + len(m.sessionId)
+	numExtensions := 0
+	extensionsLength := 0
+
+	nextProtoLen := 0
+	if m.nextProtoNeg {
+		numExtensions++
+		for _, v := range m.nextProtos {
+			nextProtoLen += len(v)
+		}
+		nextProtoLen += len(m.nextProtos)
+		extensionsLength += nextProtoLen
+	}
+	if numExtensions > 0 {
+		extensionsLength += 4 * numExtensions
+		length += 2 + extensionsLength
+	}
+
 	x := make([]byte, 4+length)
 	x[0] = typeServerHello
 	x[1] = uint8(length >> 16)
@@ -115,11 +260,49 @@ func (m *serverHelloMsg) marshal() []byte {
 	z[0] = uint8(m.cipherSuite >> 8)
 	z[1] = uint8(m.cipherSuite)
 	z[2] = uint8(m.compressionMethod)
+
+	z = z[3:]
+	if numExtensions > 0 {
+		z[0] = byte(extensionsLength >> 8)
+		z[1] = byte(extensionsLength)
+		z = z[2:]
+	}
+	if m.nextProtoNeg {
+		z[0] = byte(extensionNextProtoNeg >> 8)
+		z[1] = byte(extensionNextProtoNeg)
+		z[2] = byte(nextProtoLen >> 8)
+		z[3] = byte(nextProtoLen)
+		z = z[4:]
+
+		for _, v := range m.nextProtos {
+			l := len(v)
+			if l > 255 {
+				l = 255
+			}
+			z[0] = byte(l)
+			copy(z[1:], strings.Bytes(v[0:l]))
+			z = z[1+l:]
+		}
+	}
+
 	m.raw = x
 
 	return x
 }
 
+func append(slice []string, elem string) []string {
+	if len(slice) < cap(slice) {
+		slice = slice[0 : len(slice)+1]
+		slice[len(slice)-1] = elem
+		return slice
+	}
+
+	fresh := make([]string, len(slice)+1, cap(slice)*2+1)
+	copy(fresh, slice)
+	fresh[len(slice)] = elem
+	return fresh
+}
+
 func (m *serverHelloMsg) unmarshal(data []byte) bool {
 	if len(data) < 42 {
 		return false
@@ -139,8 +322,53 @@ func (m *serverHelloMsg) unmarshal(data []byte) bool {
 	}
 	m.cipherSuite = uint16(data[0])<<8 | uint16(data[1])
 	m.compressionMethod = data[2]
+	data = data[3:]
+
+	m.nextProtoNeg = false
+	m.nextProtos = nil
+
+	if len(data) == 0 {
+		// ServerHello is optionally followed by extension data
+		return true
+	}
+	if len(data) < 2 {
+		return false
+	}
+
+	extensionsLength := int(data[0])<<8 | int(data[1])
+	data = data[2:]
+	if len(data) != extensionsLength {
+		return false
+	}
+
+	for len(data) != 0 {
+		if len(data) < 4 {
+			return false
+		}
+		extension := uint16(data[0])<<8 | uint16(data[1])
+		length := int(data[2])<<8 | int(data[3])
+		data = data[4:]
+		if len(data) < length {
+			return false
+		}
+
+		switch extension {
+		case extensionNextProtoNeg:
+			m.nextProtoNeg = true
+			d := data
+			for len(d) > 0 {
+				l := int(d[0])
+				d = d[1:]
+				if l == 0 || l > len(d) {
+					return false
+				}
+				m.nextProtos = append(m.nextProtos, string(d[0:l]))
+				d = d[l:]
+			}
+		}
+		data = data[length:]
+	}
 
-	// Trailing data is allowed because extensions may be present.
 	return true
 }
 
@@ -295,3 +523,63 @@ func (m *finishedMsg) unmarshal(data []byte) bool {
 	m.verifyData = data[4:]
 	return true
 }
+
+type nextProtoMsg struct {
+	raw   []byte
+	proto string
+}
+
+func (m *nextProtoMsg) marshal() []byte {
+	if m.raw != nil {
+		return m.raw
+	}
+	l := len(m.proto)
+	if l > 255 {
+		l = 255
+	}
+
+	padding := 32 - (l+2)%32
+	length := l + padding + 2
+	x := make([]byte, length+4)
+	x[0] = typeNextProtocol
+	x[1] = uint8(length >> 16)
+	x[2] = uint8(length >> 8)
+	x[3] = uint8(length)
+
+	y := x[4:]
+	y[0] = byte(l)
+	copy(y[1:], strings.Bytes(m.proto[0:l]))
+	y = y[1+l:]
+	y[0] = byte(padding)
+
+	m.raw = x
+
+	return x
+}
+
+func (m *nextProtoMsg) unmarshal(data []byte) bool {
+	m.raw = data
+
+	if len(data) < 5 {
+		return false
+	}
+	data = data[4:]
+	protoLen := int(data[0])
+	data = data[1:]
+	if len(data) < protoLen {
+		return false
+	}
+	m.proto = string(data[0:protoLen])
+	data = data[protoLen:]
+
+	if len(data) < 1 {
+		return false
+	}
+	paddingLen := int(data[0])
+	data = data[1:]
+	if len(data) != paddingLen {
+		return false
+	}
+
+	return true
+}

src/pkg/crypto/tls/handshake_messages_test.go

@@ -14,9 +14,11 @@ import (
 var tests = []interface{}{
 	&clientHelloMsg{},
 	&serverHelloMsg{},
+
 	&certificateMsg{},
 	&clientKeyExchangeMsg{},
 	&finishedMsg{},
+	&nextProtoMsg{},
 }
 
 type testMessage interface {
@@ -40,21 +42,26 @@ func TestMarshalUnmarshal(t *testing.T) {
 			marshaled := m1.marshal()
 			m2 := iface.(testMessage)
 			if !m2.unmarshal(marshaled) {
-				t.Errorf("#%d failed to unmarshal %#v", i, m1)
+				t.Errorf("#%d failed to unmarshal %#v %x", i, m1, marshaled)
 				break
 			}
 			m2.marshal() // to fill any marshal cache in the message
 
 			if !reflect.DeepEqual(m1, m2) {
-				t.Errorf("#%d got:%#v want:%#v", i, m1, m2)
+				t.Errorf("#%d got:%#v want:%#v %x", i, m2, m1, marshaled)
 				break
 			}
 
-			// Now check that all prefixes are invalid.
+			if i >= 2 {
-			for j := 0; j < len(marshaled); j++ {
+				// The first two message types (ClientHello and
-				if m2.unmarshal(marshaled[0:j]) {
+				// ServerHello) are allowed to have parsable
-					t.Errorf("#%d unmarshaled a prefix of length %d of %#v", i, j, m1)
+				// prefixes because the extension data is
-					break
+				// optional.
+				for j := 0; j < len(marshaled); j++ {
+					if m2.unmarshal(marshaled[0:j]) {
+						t.Errorf("#%d unmarshaled a prefix of length %d of %#v", i, j, m1)
+						break
+					}
 				}
 			}
 		}
@@ -83,6 +90,11 @@ func randomBytes(n int, rand *rand.Rand) []byte {
 	return r
 }
 
+func randomString(n int, rand *rand.Rand) string {
+	b := randomBytes(n, rand)
+	return string(b)
+}
+
 func (*clientHelloMsg) Generate(rand *rand.Rand, size int) reflect.Value {
 	m := &clientHelloMsg{}
 	m.major = uint8(rand.Intn(256))
@@ -94,6 +106,12 @@ func (*clientHelloMsg) Generate(rand *rand.Rand, size int) reflect.Value {
 		m.cipherSuites[i] = uint16(rand.Int31())
 	}
 	m.compressionMethods = randomBytes(rand.Intn(63)+1, rand)
+	if rand.Intn(10) > 5 {
+		m.nextProtoNeg = true
+	}
+	if rand.Intn(10) > 5 {
+		m.serverName = randomString(rand.Intn(255), rand)
+	}
 
 	return reflect.NewValue(m)
 }
@@ -106,6 +124,17 @@ func (*serverHelloMsg) Generate(rand *rand.Rand, size int) reflect.Value {
 	m.sessionId = randomBytes(rand.Intn(32), rand)
 	m.cipherSuite = uint16(rand.Int31())
 	m.compressionMethod = uint8(rand.Intn(256))
+
+	if rand.Intn(10) > 5 {
+		m.nextProtoNeg = true
+
+		n := rand.Intn(10)
+		m.nextProtos = make([]string, n)
+		for i := 0; i < n; i++ {
+			m.nextProtos[i] = randomString(20, rand)
+		}
+	}
+
 	return reflect.NewValue(m)
 }
 
@@ -130,3 +159,9 @@ func (*finishedMsg) Generate(rand *rand.Rand, size int) reflect.Value {
 	m.verifyData = randomBytes(12, rand)
 	return reflect.NewValue(m)
 }
+
+func (*nextProtoMsg) Generate(rand *rand.Rand, size int) reflect.Value {
+	m := &nextProtoMsg{}
+	m.proto = randomString(rand.Intn(255), rand)
+	return reflect.NewValue(m)
+}

src/pkg/crypto/tls/handshake_server.go

@@ -108,6 +108,10 @@ func (h *serverHandshake) loop(writeChan chan<- interface{}, controlChan chan<-
 		return
 	}
 	hello.compressionMethod = compressionNone
+	if clientHello.nextProtoNeg {
+		hello.nextProtoNeg = true
+		hello.nextProtos = config.NextProtos
+	}
 
 	finishedHash.Write(hello.marshal())
 	writeChan <- writerSetVersion{major, minor}
@@ -165,6 +169,17 @@ func (h *serverHandshake) loop(writeChan chan<- interface{}, controlChan chan<-
 	cipher, _ := rc4.NewCipher(clientKey)
 	controlChan <- &newCipherSpec{cipher, hmac.New(sha1.New(), clientMAC)}
 
+	clientProtocol := ""
+	if hello.nextProtoNeg {
+		nextProto, ok := h.readHandshakeMsg().(*nextProtoMsg)
+		if !ok {
+			h.error(alertUnexpectedMessage)
+			return
+		}
+		finishedHash.Write(nextProto.marshal())
+		clientProtocol = nextProto.proto
+	}
+
 	clientFinished, ok := h.readHandshakeMsg().(*finishedMsg)
 	if !ok {
 		h.error(alertUnexpectedMessage)
@@ -178,7 +193,7 @@ func (h *serverHandshake) loop(writeChan chan<- interface{}, controlChan chan<-
 		return
 	}
 
-	controlChan <- ConnectionState{true, "TLS_RSA_WITH_RC4_128_SHA", 0}
+	controlChan <- ConnectionState{true, "TLS_RSA_WITH_RC4_128_SHA", 0, clientProtocol}
 
 	finishedHash.Write(clientFinished.marshal())
 
@@ -228,7 +243,7 @@ func (h *serverHandshake) error(e alertType) {
 			for _ = range h.msgChan {
 			}
 		}()
-		h.controlChan <- ConnectionState{false, "", e}
+		h.controlChan <- ConnectionState{false, "", e, ""}
 		close(h.controlChan)
 		h.writeChan <- alert{alertLevelError, e}
 	}

src/pkg/crypto/tls/handshake_server_test.go

@@ -51,7 +51,7 @@ func testClientHelloFailure(t *testing.T, clientHello interface{}, expectedAlert
 	send := script.NewEvent("send", nil, script.Send{msgChan, clientHello})
 	recvAlert := script.NewEvent("recv alert", []*script.Event{send}, script.Recv{writeChan, alert{alertLevelError, expectedAlert}})
 	close1 := script.NewEvent("msgChan close", []*script.Event{recvAlert}, script.Closed{writeChan})
-	recvState := script.NewEvent("recv state", []*script.Event{send}, script.Recv{controlChan, ConnectionState{false, "", expectedAlert}})
+	recvState := script.NewEvent("recv state", []*script.Event{send}, script.Recv{controlChan, ConnectionState{false, "", expectedAlert, ""}})
 	close2 := script.NewEvent("controlChan close", []*script.Event{recvState}, script.Closed{controlChan})
 
 	err := script.Perform(0, []*script.Event{send, recvAlert, close1, recvState, close2})
@@ -78,13 +78,13 @@ func TestRejectBadProtocolVersion(t *testing.T) {
 }
 
 func TestNoSuiteOverlap(t *testing.T) {
-	clientHello := &clientHelloMsg{nil, 3, 1, nil, nil, []uint16{0xff00}, []uint8{0}}
+	clientHello := &clientHelloMsg{nil, 3, 1, nil, nil, []uint16{0xff00}, []uint8{0}, false, ""}
 	testClientHelloFailure(t, clientHello, alertHandshakeFailure)
 
 }
 
 func TestNoCompressionOverlap(t *testing.T) {
-	clientHello := &clientHelloMsg{nil, 3, 1, nil, nil, []uint16{TLS_RSA_WITH_RC4_128_SHA}, []uint8{0xff}}
+	clientHello := &clientHelloMsg{nil, 3, 1, nil, nil, []uint16{TLS_RSA_WITH_RC4_128_SHA}, []uint8{0xff}, false, ""}
 	testClientHelloFailure(t, clientHello, alertHandshakeFailure)
 }
 
@@ -165,7 +165,7 @@ func TestFullHandshake(t *testing.T) {
 	defer close(msgChan)
 
 	// The values for this test were obtained from running `gnutls-cli --insecure --debug 9`
-	clientHello := &clientHelloMsg{fromHex("0100007603024aef7d77e4686d5dfd9d953dfe280788759ffd440867d687670216da45516b310000340033004500390088001600320044003800870013006600900091008f008e002f004100350084000a00050004008c008d008b008a01000019000900030200010000000e000c0000093132372e302e302e31"), 3, 2, fromHex("4aef7d77e4686d5dfd9d953dfe280788759ffd440867d687670216da45516b31"), nil, []uint16{0x33, 0x45, 0x39, 0x88, 0x16, 0x32, 0x44, 0x38, 0x87, 0x13, 0x66, 0x90, 0x91, 0x8f, 0x8e, 0x2f, 0x41, 0x35, 0x84, 0xa, 0x5, 0x4, 0x8c, 0x8d, 0x8b, 0x8a}, []uint8{0x0}}
+	clientHello := &clientHelloMsg{fromHex("0100007603024aef7d77e4686d5dfd9d953dfe280788759ffd440867d687670216da45516b310000340033004500390088001600320044003800870013006600900091008f008e002f004100350084000a00050004008c008d008b008a01000019000900030200010000000e000c0000093132372e302e302e31"), 3, 2, fromHex("4aef7d77e4686d5dfd9d953dfe280788759ffd440867d687670216da45516b31"), nil, []uint16{0x33, 0x45, 0x39, 0x88, 0x16, 0x32, 0x44, 0x38, 0x87, 0x13, 0x66, 0x90, 0x91, 0x8f, 0x8e, 0x2f, 0x41, 0x35, 0x84, 0xa, 0x5, 0x4, 0x8c, 0x8d, 0x8b, 0x8a}, []uint8{0x0}, false, ""}
 
 	sendHello := script.NewEvent("send hello", nil, script.Send{msgChan, clientHello})
 	setVersion := script.NewEvent("set version", []*script.Event{sendHello}, script.Recv{writeChan, writerSetVersion{3, 2}})
@@ -183,7 +183,7 @@ func TestFullHandshake(t *testing.T) {
 	sendFinished := script.NewEvent("send finished", []*script.Event{recvNCS}, script.Send{msgChan, finished})
 	recvFinished := script.NewEvent("recv finished", []*script.Event{sendFinished}, script.RecvMatch{writeChan, matchFinished})
 	setCipher := script.NewEvent("set cipher", []*script.Event{sendFinished}, script.RecvMatch{writeChan, matchSetCipher})
-	recvConnectionState := script.NewEvent("recv state", []*script.Event{sendFinished}, script.Recv{controlChan, ConnectionState{true, "TLS_RSA_WITH_RC4_128_SHA", 0}})
+	recvConnectionState := script.NewEvent("recv state", []*script.Event{sendFinished}, script.Recv{controlChan, ConnectionState{true, "TLS_RSA_WITH_RC4_128_SHA", 0, ""}})
 
 	err := script.Perform(0, []*script.Event{sendHello, setVersion, recvHello, recvCert, recvDone, sendCKX, sendCCS, recvNCS, sendFinished, setCipher, recvConnectionState, recvFinished})
 	if err != nil {

src/pkg/crypto/tls/record_process.go

@@ -291,6 +291,8 @@ func parseHandshakeMsg(data []byte) (interface{}, bool) {
 		m = new(serverHelloDoneMsg)
 	case typeClientKeyExchange:
 		m = new(clientKeyExchangeMsg)
+	case typeNextProtocol:
+		m = new(nextProtoMsg)
 	default:
 		return nil, false
 	}

src/pkg/crypto/tls/record_process_test.go

@@ -36,7 +36,7 @@ func TestNullConnectionState(t *testing.T) {
 	// Test a simple request for the connection state.
 	replyChan := make(chan ConnectionState)
 	sendReq := script.NewEvent("send request", nil, script.Send{requestChan, getConnectionState{replyChan}})
-	getReply := script.NewEvent("get reply", []*script.Event{sendReq}, script.Recv{replyChan, ConnectionState{false, "", 0}})
+	getReply := script.NewEvent("get reply", []*script.Event{sendReq}, script.Recv{replyChan, ConnectionState{false, "", 0, ""}})
 
 	err := script.Perform(0, []*script.Event{sendReq, getReply})
 	if err != nil {
@@ -55,9 +55,9 @@ func TestWaitConnectionState(t *testing.T) {
 	sendReq := script.NewEvent("send request", nil, script.Send{requestChan, waitConnectionState{replyChan}})
 	replyChan2 := make(chan ConnectionState)
 	sendReq2 := script.NewEvent("send request 2", []*script.Event{sendReq}, script.Send{requestChan, getConnectionState{replyChan2}})
-	getReply2 := script.NewEvent("get reply 2", []*script.Event{sendReq2}, script.Recv{replyChan2, ConnectionState{false, "", 0}})
+	getReply2 := script.NewEvent("get reply 2", []*script.Event{sendReq2}, script.Recv{replyChan2, ConnectionState{false, "", 0, ""}})
-	sendState := script.NewEvent("send state", []*script.Event{getReply2}, script.Send{controlChan, ConnectionState{true, "test", 1}})
+	sendState := script.NewEvent("send state", []*script.Event{getReply2}, script.Send{controlChan, ConnectionState{true, "test", 1, ""}})
-	getReply := script.NewEvent("get reply", []*script.Event{sendState}, script.Recv{replyChan, ConnectionState{true, "test", 1}})
+	getReply := script.NewEvent("get reply", []*script.Event{sendState}, script.Recv{replyChan, ConnectionState{true, "test", 1, ""}})
 
 	err := script.Perform(0, []*script.Event{sendReq, sendReq2, getReply2, sendState, getReply})
 	if err != nil {
@@ -108,7 +108,7 @@ func TestApplicationData(t *testing.T) {
 	// Test that the application data is forwarded after a successful Finished message.
 	send1 := script.NewEvent("send 1", nil, script.Send{recordChan, &record{recordTypeHandshake, 0, 0, fromHex("1400000c000000000000000000000000")}})
 	recv1 := script.NewEvent("recv finished", []*script.Event{send1}, script.Recv{handshakeChan, &finishedMsg{fromHex("1400000c000000000000000000000000"), fromHex("000000000000000000000000")}})
-	send2 := script.NewEvent("send connState", []*script.Event{recv1}, script.Send{controlChan, ConnectionState{true, "", 0}})
+	send2 := script.NewEvent("send connState", []*script.Event{recv1}, script.Send{controlChan, ConnectionState{true, "", 0, ""}})
 	send3 := script.NewEvent("send 2", []*script.Event{send2}, script.Send{recordChan, &record{recordTypeApplicationData, 0, 0, fromHex("0102")}})
 	recv2 := script.NewEvent("recv data", []*script.Event{send3}, script.Recv{appDataChan, []byte{0x01, 0x02}})
 
@@ -126,7 +126,7 @@ func TestInvalidChangeCipherSpec(t *testing.T) {
 
 	send1 := script.NewEvent("send 1", nil, script.Send{recordChan, &record{recordTypeChangeCipherSpec, 0, 0, []byte{1}}})
 	recv1 := script.NewEvent("recv 1", []*script.Event{send1}, script.Recv{handshakeChan, changeCipherSpec{}})
-	send2 := script.NewEvent("send 2", []*script.Event{recv1}, script.Send{controlChan, ConnectionState{false, "", 42}})
+	send2 := script.NewEvent("send 2", []*script.Event{recv1}, script.Send{controlChan, ConnectionState{false, "", 42, ""}})
 	close := script.NewEvent("close 1", []*script.Event{send2}, script.Closed{appDataChan})
 	close2 := script.NewEvent("close 2", []*script.Event{send2}, script.Closed{handshakeChan})
 

src/pkg/crypto/tls/record_read.go

@@ -21,7 +21,7 @@ func recordReader(c chan<- *record, source io.Reader) {
 
 	for {
 		var header [5]byte
-		n, _ := buf.Read(header[0:])
+		n, _ := buf.Read(&header)
 		if n != 5 {
 			return
 		}