fix: (*UConn).Read() and Secure Renegotiation (#292)

* fix: UConn Read does not trigger correct Handshake

Copy `(*Conn).Read` to `(*UConn).Read` and force it use `(*UConn).Handshake`.
Same for `handleRenegotiation` and `handlePostHandshakeMessage`.

Signed-off-by: Gaukas Wang <i@gaukas.wang>

* update: use VerifyData in RenegotiationInfoExt

This make sure the renegotiation would work in certain scenarios instead of no scenarios.

Signed-off-by: Gaukas Wang <i@gaukas.wang>

---------

Signed-off-by: Gaukas Wang <i@gaukas.wang>

u_conn.go

@@ -781,3 +781,134 @@ type utlsConnExtraFields struct {
 
 	sessionController *sessionController
 }
+
+// Read reads data from the connection.
+//
+// As Read calls [Conn.Handshake], in order to prevent indefinite blocking a deadline
+// must be set for both Read and [Conn.Write] before Read is called when the handshake
+// has not yet completed. See [Conn.SetDeadline], [Conn.SetReadDeadline], and
+// [Conn.SetWriteDeadline].
+func (c *UConn) Read(b []byte) (int, error) {
+	if err := c.Handshake(); err != nil {
+		return 0, err
+	}
+	if len(b) == 0 {
+		// Put this after Handshake, in case people were calling
+		// Read(nil) for the side effect of the Handshake.
+		return 0, nil
+	}
+
+	c.in.Lock()
+	defer c.in.Unlock()
+
+	for c.input.Len() == 0 {
+		if err := c.readRecord(); err != nil {
+			return 0, err
+		}
+		for c.hand.Len() > 0 {
+			if err := c.handlePostHandshakeMessage(); err != nil {
+				return 0, err
+			}
+		}
+	}
+
+	n, _ := c.input.Read(b)
+
+	// If a close-notify alert is waiting, read it so that we can return (n,
+	// EOF) instead of (n, nil), to signal to the HTTP response reading
+	// goroutine that the connection is now closed. This eliminates a race
+	// where the HTTP response reading goroutine would otherwise not observe
+	// the EOF until its next read, by which time a client goroutine might
+	// have already tried to reuse the HTTP connection for a new request.
+	// See https://golang.org/cl/76400046 and https://golang.org/issue/3514
+	if n != 0 && c.input.Len() == 0 && c.rawInput.Len() > 0 &&
+		recordType(c.rawInput.Bytes()[0]) == recordTypeAlert {
+		if err := c.readRecord(); err != nil {
+			return n, err // will be io.EOF on closeNotify
+		}
+	}
+
+	return n, nil
+}
+
+// handleRenegotiation processes a HelloRequest handshake message.
+func (c *UConn) handleRenegotiation() error {
+	if c.vers == VersionTLS13 {
+		return errors.New("tls: internal error: unexpected renegotiation")
+	}
+
+	msg, err := c.readHandshake(nil)
+	if err != nil {
+		return err
+	}
+
+	helloReq, ok := msg.(*helloRequestMsg)
+	if !ok {
+		c.sendAlert(alertUnexpectedMessage)
+		return unexpectedMessageError(helloReq, msg)
+	}
+
+	if !c.isClient {
+		return c.sendAlert(alertNoRenegotiation)
+	}
+
+	switch c.config.Renegotiation {
+	case RenegotiateNever:
+		return c.sendAlert(alertNoRenegotiation)
+	case RenegotiateOnceAsClient:
+		if c.handshakes > 1 {
+			return c.sendAlert(alertNoRenegotiation)
+		}
+	case RenegotiateFreelyAsClient:
+		// Ok.
+	default:
+		c.sendAlert(alertInternalError)
+		return errors.New("tls: unknown Renegotiation value")
+	}
+
+	c.handshakeMutex.Lock()
+	defer c.handshakeMutex.Unlock()
+
+	c.isHandshakeComplete.Store(false)
+
+	// [uTLS section begins]
+	if err = c.BuildHandshakeState(); err != nil {
+		return err
+	}
+	// [uTLS section ends]
+	if c.handshakeErr = c.clientHandshake(context.Background()); c.handshakeErr == nil {
+		c.handshakes++
+	}
+	return c.handshakeErr
+}
+
+// handlePostHandshakeMessage processes a handshake message arrived after the
+// handshake is complete. Up to TLS 1.2, it indicates the start of a renegotiation.
+func (c *UConn) handlePostHandshakeMessage() error {
+	if c.vers != VersionTLS13 {
+		return c.handleRenegotiation()
+	}
+
+	msg, err := c.readHandshake(nil)
+	if err != nil {
+		return err
+	}
+	c.retryCount++
+	if c.retryCount > maxUselessRecords {
+		c.sendAlert(alertUnexpectedMessage)
+		return c.in.setErrorLocked(errors.New("tls: too many non-advancing records"))
+	}
+
+	switch msg := msg.(type) {
+	case *newSessionTicketMsgTLS13:
+		return c.handleNewSessionTicket(msg)
+	case *keyUpdateMsg:
+		return c.handleKeyUpdate(msg)
+	}
+	// The QUIC layer is supposed to treat an unexpected post-handshake CertificateRequest
+	// as a QUIC-level PROTOCOL_VIOLATION error (RFC 9001, Section 4.4). Returning an
+	// unexpected_message alert here doesn't provide it with enough information to distinguish
+	// this condition from other unexpected messages. This is probably fine.
+	c.sendAlert(alertUnexpectedMessage)
+	return fmt.Errorf("tls: received unexpected handshake message of type %T", msg)
+}

u_tls_extensions.go

@@ -1563,27 +1563,27 @@ type RenegotiationInfoExtension struct {
 	// If this is the initial handshake for a connection, then the
 	// "renegotiated_connection" field is of zero length in both the
 	// ClientHello and the ServerHello.
-	// RenegotiatedConnection []byte
+	RenegotiatedConnection []byte
 }
 
 func (e *RenegotiationInfoExtension) Len() int {
-	return 5 // + len(e.RenegotiatedConnection)
+	return 5 + len(e.RenegotiatedConnection)
 }
 
 func (e *RenegotiationInfoExtension) Read(b []byte) (int, error) {
 	if len(b) < e.Len() {
 		return 0, io.ErrShortBuffer
 	}
 
-	// dataLen := len(e.RenegotiatedConnection)
-	extBodyLen := 1 // + len(dataLen)
+	dataLen := len(e.RenegotiatedConnection)
+	extBodyLen := 1 + dataLen
 
 	b[0] = byte(extensionRenegotiationInfo >> 8)
 	b[1] = byte(extensionRenegotiationInfo & 0xff)
 	b[2] = byte(extBodyLen >> 8)
 	b[3] = byte(extBodyLen)
-	// b[4] = byte(dataLen)
-	// copy(b[5:], e.RenegotiatedConnection)
+	b[4] = byte(dataLen)
+	copy(b[5:], e.RenegotiatedConnection)
 
 	return e.Len(), io.EOF
 }
@@ -1593,7 +1593,7 @@ func (e *RenegotiationInfoExtension) UnmarshalJSON(_ []byte) error {
 	return nil
 }
 
-func (e *RenegotiationInfoExtension) Write(_ []byte) (int, error) {
+func (e *RenegotiationInfoExtension) Write(b []byte) (int, error) {
 	e.Renegotiation = RenegotiateOnceAsClient // none empty or other modes are unsupported
 	// extData := cryptobyte.String(b)
 	// var renegotiatedConnection cryptobyte.String
@@ -1602,7 +1602,10 @@ func (e *RenegotiationInfoExtension) Write(_ []byte) (int, error) {
 	// }
 	// e.RenegotiatedConnection = make([]byte, len(renegotiatedConnection))
 	// copy(e.RenegotiatedConnection, renegotiatedConnection)
-	return 0, nil
+
+	// we don't really want to parse it at all.
+
+	return len(b), nil
 }
 
 func (e *RenegotiationInfoExtension) writeToUConn(uc *UConn) error {
@@ -1612,6 +1615,10 @@ func (e *RenegotiationInfoExtension) writeToUConn(uc *UConn) error {
 		fallthrough
 	case RenegotiateFreelyAsClient:
 		uc.HandshakeState.Hello.SecureRenegotiationSupported = true
+		// TODO: don't do backward propagation here
+		if uc.handshakes > 0 {
+			e.RenegotiatedConnection = uc.clientFinished[:]
+		}
 	case RenegotiateNever:
 	default:
 	}