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	/*
	* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.security.ssl;

	import java.io.IOException;
	import java.nio.ByteBuffer;
	import java.text.MessageFormat;
	import java.util.List;
	import java.util.ArrayList;
	import java.util.Locale;
	import javax.net.ssl.SSLHandshakeException;
	import java.security.cert.X509Certificate;
	import sun.security.provider.certpath.OCSPResponse;
	import sun.security.ssl.SSLHandshake.HandshakeMessage;
	import static sun.security.ssl.CertStatusExtension.*;
	import static sun.security.ssl.CertificateMessage.*;

	/**
	* Consumers and producers for the CertificateStatus handshake message.
	* This message takes one of two related but slightly different forms,
	* depending on the type of stapling selected by the server. The message
	* data will be of the form(s):
	*
	* [status_request, RFC 6066]
	*
	* struct {
	* CertificateStatusType status_type;
	* select (status_type) {
	* case ocsp: OCSPResponse;
	* } response;
	* } CertificateStatus;
	*
	* opaque OCSPResponse<1..2^24-1>;
	*
	* [status_request_v2, RFC 6961]
	*
	* struct {
	* CertificateStatusType status_type;
	* select (status_type) {
	* case ocsp: OCSPResponse;
	* case ocsp_multi: OCSPResponseList;
	* } response;
	* } CertificateStatus;
	*
	* opaque OCSPResponse<0..2^24-1>;
	*
	* struct {
	* OCSPResponse ocsp_response_list<1..2^24-1>;
	* } OCSPResponseList;
	*/
	final class CertificateStatus {
	static final SSLConsumer handshakeConsumer =
	new CertificateStatusConsumer();
	static final HandshakeProducer handshakeProducer =
	new CertificateStatusProducer();
	static final HandshakeAbsence handshakeAbsence =
	new CertificateStatusAbsence();

	/**
	* The CertificateStatus handshake message.
	*/
	static final class CertificateStatusMessage extends HandshakeMessage {

	final CertStatusRequestType statusType;
	int encodedResponsesLen = 0;
	int messageLength = -1;
	final List<byte[]> encodedResponses = new ArrayList<>();

	CertificateStatusMessage(HandshakeContext handshakeContext) {
	super(handshakeContext);

	ServerHandshakeContext shc =
	(ServerHandshakeContext)handshakeContext;

	// Get the Certificates from the SSLContextImpl amd the Stapling
	// parameters
	StatusResponseManager.StaplingParameters stapleParams =
	shc.stapleParams;
	if (stapleParams == null) {
	throw new IllegalArgumentException(
	"Unexpected null stapling parameters");
	}

	X509Certificate[] certChain =
	(X509Certificate[])shc.handshakeSession.getLocalCertificates();
	if (certChain == null) {
	throw new IllegalArgumentException(
	"Unexpected null certificate chain");
	}

	// Walk the certificate list and add the correct encoded responses
	// to the encoded responses list
	statusType = stapleParams.statReqType;
	if (statusType == CertStatusRequestType.OCSP) {
	// Just worry about the first cert in the chain
	byte[] resp = stapleParams.responseMap.get(certChain[0]);
	if (resp == null) {
	// A not-found return status means we should include
	// a zero-length response in CertificateStatus.
	// This is highly unlikely to happen in practice.
	resp = new byte[0];
	}
	encodedResponses.add(resp);
	encodedResponsesLen += resp.length + 3;
	} else if (statusType == CertStatusRequestType.OCSP_MULTI) {
	for (X509Certificate cert : certChain) {
	byte[] resp = stapleParams.responseMap.get(cert);
	if (resp == null) {
	resp = new byte[0];
	}
	encodedResponses.add(resp);
	encodedResponsesLen += resp.length + 3;
	}
	} else {
	throw new IllegalArgumentException(
	"Unsupported StatusResponseType: " + statusType);
	}

	messageLength = messageLength();
	}

	CertificateStatusMessage(HandshakeContext handshakeContext,
	ByteBuffer m) throws IOException {
	super(handshakeContext);

	statusType = CertStatusRequestType.valueOf((byte)Record.getInt8(m));
	if (statusType == CertStatusRequestType.OCSP) {
	byte[] respDER = Record.getBytes24(m);
	// Convert the incoming bytes to a OCSPResponse strucutre
	if (respDER.length > 0) {
	encodedResponses.add(respDER);
	encodedResponsesLen = 3 + respDER.length;
	} else {
	throw handshakeContext.conContext.fatal(
	Alert.HANDSHAKE_FAILURE,
	"Zero-length OCSP Response");
	}
	} else if (statusType == CertStatusRequestType.OCSP_MULTI) {
	int respListLen = Record.getInt24(m);
	encodedResponsesLen = respListLen;

	// Add each OCSP reponse into the array list in the order
	// we receive them off the wire. A zero-length array is
	// allowed for ocsp_multi, and means that a response for
	// a given certificate is not available.
	while (respListLen > 0) {
	byte[] respDER = Record.getBytes24(m);
	encodedResponses.add(respDER);
	respListLen -= (respDER.length + 3);
	}

	if (respListLen != 0) {
	throw handshakeContext.conContext.fatal(
	Alert.INTERNAL_ERROR,
	"Bad OCSP response list length");
	}
	} else {
	throw handshakeContext.conContext.fatal(
	Alert.HANDSHAKE_FAILURE,
	"Unsupported StatusResponseType: " + statusType);
	}
	messageLength = messageLength();
	}

	@Override
	public SSLHandshake handshakeType() {
	return SSLHandshake.CERTIFICATE_STATUS;
	}

	@Override
	public int messageLength() {
	int len = 1;

	if (messageLength == -1) {
	if (statusType == CertStatusRequestType.OCSP) {
	len += encodedResponsesLen;
	} else if (statusType == CertStatusRequestType.OCSP_MULTI) {
	len += 3 + encodedResponsesLen;
	}
	messageLength = len;
	}

	return messageLength;
	}

	@Override
	public void send(HandshakeOutStream s) throws IOException {
	s.putInt8(statusType.id);
	if (statusType == CertStatusRequestType.OCSP) {
	s.putBytes24(encodedResponses.get(0));
	} else if (statusType == CertStatusRequestType.OCSP_MULTI) {
	s.putInt24(encodedResponsesLen);
	for (byte[] respBytes : encodedResponses) {
	if (respBytes != null) {
	s.putBytes24(respBytes);
	} else {
	s.putBytes24(null);
	}
	}
	} else {
	// It is highly unlikely that we will fall into this section
	// of the code.
	throw new SSLHandshakeException("Unsupported status_type: " +
	statusType.id);
	}
	}

	@Override
	public String toString() {
	StringBuilder sb = new StringBuilder();

	// Stringify the encoded OCSP response list
	for (byte[] respDER : encodedResponses) {
	if (respDER.length > 0) {
	try {
	OCSPResponse oResp = new OCSPResponse(respDER);
	sb.append(oResp.toString()).append("\n");
	} catch (IOException ioe) {
	sb.append("OCSP Response Exception: ").append(ioe)
	.append("\n");
	}
	} else {
	sb.append("<Zero-length entry>\n");
	}
	}

	MessageFormat messageFormat = new MessageFormat(
	"\"CertificateStatus\": '{'\n" +
	" \"type\" : \"{0}\",\n" +
	" \"responses \" : [\n" + "{1}\n" + " ]\n" +
	"'}'",
	Locale.ENGLISH);
	Object[] messageFields = {
	statusType.name,
	Utilities.indent(Utilities.indent(sb.toString()))
	};

	return messageFormat.format(messageFields);
	}
	}

	/**
	* The CertificateStatus handshake message consumer.
	*/
	private static final class CertificateStatusConsumer
	implements SSLConsumer {
	// Prevent instantiation of this class.
	private CertificateStatusConsumer() {
	// blank
	}

	@Override
	public void consume(ConnectionContext context,
	ByteBuffer message) throws IOException {
	ClientHandshakeContext chc = (ClientHandshakeContext)context;
	CertificateStatusMessage cst =
	new CertificateStatusMessage(chc, message);

	// Log the message
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine(
	"Consuming server CertificateStatus handshake message",
	cst);
	}

	// Pin the received responses to the SSLSessionImpl. It will
	// be retrieved by the X509TrustManagerImpl during the certificate
	// checking phase.
	chc.handshakeSession.setStatusResponses(cst.encodedResponses);

	// Now perform the check
	T12CertificateConsumer.checkServerCerts(chc, chc.deferredCerts);

	// Update the handshake consumers to remove this message, indicating
	// that it has been processed.
	chc.handshakeConsumers.remove(SSLHandshake.CERTIFICATE_STATUS.id);
	}
	}

	/**
	* The CertificateStatus handshake message consumer.
	*/
	private static final class CertificateStatusProducer
	implements HandshakeProducer {
	// Prevent instantiation of this class.
	private CertificateStatusProducer() {
	// blank
	}

	@Override
	public byte[] produce(ConnectionContext context,
	HandshakeMessage message) throws IOException {
	// Only the server-side should be a producer of this message
	ServerHandshakeContext shc = (ServerHandshakeContext)context;

	// If stapling is not active, immediately return without producing
	// a message or any further processing.
	if (!shc.staplingActive) {
	return null;
	}

	// Create the CertificateStatus message from info in the
	CertificateStatusMessage csm = new CertificateStatusMessage(shc);
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine(
	"Produced server CertificateStatus handshake message", csm);
	}

	// Output the handshake message.
	csm.write(shc.handshakeOutput);
	shc.handshakeOutput.flush();

	// The handshake message has been delivered.
	return null;
	}
	}

	private static final class CertificateStatusAbsence
	implements HandshakeAbsence {
	// Prevent instantiation of this class
	private CertificateStatusAbsence() {
	// blank
	}

	@Override
	public void absent(ConnectionContext context,
	HandshakeMessage message) throws IOException {
	ClientHandshakeContext chc = (ClientHandshakeContext)context;

	// Processing should only continue if stapling is active
	if (chc.staplingActive) {
	// Because OCSP stapling is active, it means two things
	// if we're here: 1) The server hello asserted the
	// status_request[_v2] extension. 2) The CertificateStatus
	// message was not sent. This means that cert path checking
	// was deferred, but must happen immediately.
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine("Server did not send CertificateStatus, " +
	"checking cert chain without status info.");
	}
	T12CertificateConsumer.checkServerCerts(chc, chc.deferredCerts);
	}
	}
	}
	}

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