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	/*
	* Copyright (c) 2015, 2018, 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.io.ByteArrayInputStream;
	import java.nio.ByteBuffer;
	import java.security.cert.Extension;
	import java.security.cert.CertificateFactory;
	import java.security.cert.CertificateException;
	import java.security.cert.X509Certificate;
	import java.text.MessageFormat;
	import java.util.ArrayList;
	import java.util.List;
	import java.util.Locale;
	import javax.net.ssl.SSLProtocolException;
	import sun.security.provider.certpath.OCSPResponse;
	import sun.security.provider.certpath.ResponderId;
	import static sun.security.ssl.SSLExtension.CH_STATUS_REQUEST;
	import static sun.security.ssl.SSLExtension.CH_STATUS_REQUEST_V2;
	import sun.security.ssl.SSLExtension.ExtensionConsumer;
	import static sun.security.ssl.SSLExtension.SH_STATUS_REQUEST;
	import static sun.security.ssl.SSLExtension.SH_STATUS_REQUEST_V2;
	import sun.security.ssl.SSLExtension.SSLExtensionSpec;
	import sun.security.ssl.SSLHandshake.HandshakeMessage;
	import sun.security.util.DerInputStream;
	import sun.security.util.DerValue;
	import sun.security.util.HexDumpEncoder;

	/**
	* Pack of "status_request" and "status_request_v2" extensions.
	*/
	final class CertStatusExtension {
	static final HandshakeProducer chNetworkProducer =
	new CHCertStatusReqProducer();
	static final ExtensionConsumer chOnLoadConsumer =
	new CHCertStatusReqConsumer();

	static final HandshakeProducer shNetworkProducer =
	new SHCertStatusReqProducer();
	static final ExtensionConsumer shOnLoadConsumer =
	new SHCertStatusReqConsumer();

	static final HandshakeProducer ctNetworkProducer =
	new CTCertStatusResponseProducer();
	static final ExtensionConsumer ctOnLoadConsumer =
	new CTCertStatusResponseConsumer();

	static final SSLStringizer certStatusReqStringizer =
	new CertStatusRequestStringizer();

	static final HandshakeProducer chV2NetworkProducer =
	new CHCertStatusReqV2Producer();
	static final ExtensionConsumer chV2OnLoadConsumer =
	new CHCertStatusReqV2Consumer();

	static final HandshakeProducer shV2NetworkProducer =
	new SHCertStatusReqV2Producer();
	static final ExtensionConsumer shV2OnLoadConsumer =
	new SHCertStatusReqV2Consumer();

	static final SSLStringizer certStatusReqV2Stringizer =
	new CertStatusRequestsStringizer();

	static final SSLStringizer certStatusRespStringizer =
	new CertStatusRespStringizer();

	/**
	* The "status_request" extension.
	*
	* RFC6066 defines the TLS extension,"status_request" (type 0x5),
	* which allows the client to request that the server perform OCSP
	* on the client's behalf.
	*
	* The "extension data" field of this extension contains a
	* "CertificateStatusRequest" structure:
	*
	* struct {
	* CertificateStatusType status_type;
	* select (status_type) {
	* case ocsp: OCSPStatusRequest;
	* } request;
	* } CertificateStatusRequest;
	*
	* enum { ocsp(1), (255) } CertificateStatusType;
	*
	* struct {
	* ResponderID responder_id_list<0..2^16-1>;
	* Extensions request_extensions;
	* } OCSPStatusRequest;
	*
	* opaque ResponderID<1..2^16-1>;
	* opaque Extensions<0..2^16-1>;
	*/
	static final class CertStatusRequestSpec implements SSLExtensionSpec {
	static final CertStatusRequestSpec DEFAULT =
	new CertStatusRequestSpec(OCSPStatusRequest.EMPTY_OCSP);

	final CertStatusRequest statusRequest;

	private CertStatusRequestSpec(CertStatusRequest statusRequest) {
	this.statusRequest = statusRequest;
	}

	private CertStatusRequestSpec(ByteBuffer buffer) throws IOException {
	// Is it a empty extension_data?
	if (buffer.remaining() == 0) {
	// server response
	this.statusRequest = null;
	return;
	}

	if (buffer.remaining() < 1) {
	throw new SSLProtocolException(
	"Invalid status_request extension: insufficient data");
	}

	byte statusType = (byte)Record.getInt8(buffer);
	byte[] encoded = new byte[buffer.remaining()];
	if (encoded.length != 0) {
	buffer.get(encoded);
	}
	if (statusType == CertStatusRequestType.OCSP.id) {
	this.statusRequest = new OCSPStatusRequest(statusType, encoded);
	} else {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.info(
	"Unknown certificate status request " +
	"(status type: " + statusType + ")");
	}

	this.statusRequest = new CertStatusRequest(statusType, encoded);
	}
	}

	@Override
	public String toString() {
	return statusRequest == null ?
	"<empty>" : statusRequest.toString();
	}
	}

	/**
	* Defines the CertificateStatus response structure as outlined in
	* RFC 6066. This will contain a status response type, plus a single,
	* non-empty OCSP response in DER-encoded form.
	*
	* struct {
	* CertificateStatusType status_type;
	* select (status_type) {
	* case ocsp: OCSPResponse;
	* } response;
	* } CertificateStatus;
	*/
	static final class CertStatusResponseSpec implements SSLExtensionSpec {
	final CertStatusResponse statusResponse;

	private CertStatusResponseSpec(CertStatusResponse resp) {
	this.statusResponse = resp;
	}

	private CertStatusResponseSpec(ByteBuffer buffer) throws IOException {
	if (buffer.remaining() < 2) {
	throw new SSLProtocolException(
	"Invalid status_request extension: insufficient data");
	}

	// Get the status type (1 byte) and response data (vector)
	byte type = (byte)Record.getInt8(buffer);
	byte[] respData = Record.getBytes24(buffer);

	// Create the CertStatusResponse based on the type
	if (type == CertStatusRequestType.OCSP.id) {
	this.statusResponse = new OCSPStatusResponse(type, respData);
	} else {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.info(
	"Unknown certificate status response " +
	"(status type: " + type + ")");
	}

	this.statusResponse = new CertStatusResponse(type, respData);
	}
	}

	@Override
	public String toString() {
	return statusResponse == null ?
	"<empty>" : statusResponse.toString();
	}
	}

	private static final
	class CertStatusRequestStringizer implements SSLStringizer {
	@Override
	public String toString(ByteBuffer buffer) {
	try {
	return (new CertStatusRequestSpec(buffer)).toString();
	} catch (IOException ioe) {
	// For debug logging only, so please swallow exceptions.
	return ioe.getMessage();
	}
	}
	}

	private static final
	class CertStatusRespStringizer implements SSLStringizer {
	@Override
	public String toString(ByteBuffer buffer) {
	try {
	return (new CertStatusResponseSpec(buffer)).toString();
	} catch (IOException ioe) {
	// For debug logging only, so please swallow exceptions.
	return ioe.getMessage();
	}
	}
	}

	static enum CertStatusRequestType {
	OCSP ((byte)0x01, "ocsp"), // RFC 6066/6961
	OCSP_MULTI ((byte)0x02, "ocsp_multi"); // RFC 6961

	final byte id;
	final String name;

	private CertStatusRequestType(byte id, String name) {
	this.id = id;
	this.name = name;
	}

	/**
	* Returns the enum constant of the specified id (see RFC 6066).
	*/
	static CertStatusRequestType valueOf(byte id) {
	for (CertStatusRequestType srt : CertStatusRequestType.values()) {
	if (srt.id == id) {
	return srt;
	}
	}

	return null;
	}

	static String nameOf(byte id) {
	for (CertStatusRequestType srt : CertStatusRequestType.values()) {
	if (srt.id == id) {
	return srt.name;
	}
	}

	return "UNDEFINED-CERT-STATUS-TYPE(" + id + ")";
	}
	}

	static class CertStatusRequest {
	final byte statusType;
	final byte[] encodedRequest;

	protected CertStatusRequest(byte statusType, byte[] encodedRequest) {
	this.statusType = statusType;
	this.encodedRequest = encodedRequest;
	}

	@Override
	public String toString() {
	MessageFormat messageFormat = new MessageFormat(
	"\"certificate status type\": {0}\n" +
	"\"encoded certificate status\": '{'\n" +
	"{1}\n" +
	"'}'",
	Locale.ENGLISH);

	HexDumpEncoder hexEncoder = new HexDumpEncoder();
	String encoded = hexEncoder.encodeBuffer(encodedRequest);

	Object[] messageFields = {
	CertStatusRequestType.nameOf(statusType),
	Utilities.indent(encoded)
	};

	return messageFormat.format(messageFields);
	}
	}

	/*
	* RFC6066 defines the TLS extension,"status_request" (type 0x5),
	* which allows the client to request that the server perform OCSP
	* on the client's behalf.
	*
	* The RFC defines an OCSPStatusRequest structure:
	*
	* struct {
	* ResponderID responder_id_list<0..2^16-1>;
	* Extensions request_extensions;
	* } OCSPStatusRequest;
	*/
	static final class OCSPStatusRequest extends CertStatusRequest {
	static final OCSPStatusRequest EMPTY_OCSP;
	static final OCSPStatusRequest EMPTY_OCSP_MULTI;

	final List<ResponderId> responderIds;
	final List<Extension> extensions;
	private final int ridListLen;
	private final int extListLen;

	static {
	OCSPStatusRequest ocspReq = null;
	OCSPStatusRequest multiReq = null;

	try {
	ocspReq = new OCSPStatusRequest(
	CertStatusRequestType.OCSP.id,
	new byte[] {0x00, 0x00, 0x00, 0x00});
	multiReq = new OCSPStatusRequest(
	CertStatusRequestType.OCSP_MULTI.id,
	new byte[] {0x00, 0x00, 0x00, 0x00});
	} catch (IOException ioe) {
	// unlikely
	}

	EMPTY_OCSP = ocspReq;
	EMPTY_OCSP_MULTI = multiReq;
	}

	private OCSPStatusRequest(byte statusType,
	byte[] encoded) throws IOException {
	super(statusType, encoded);

	if (encoded == null \|\| encoded.length < 4) {
	// 2: length of responder_id_list
	// +2: length of request_extensions
	throw new SSLProtocolException(
	"Invalid OCSP status request: insufficient data");
	}

	List<ResponderId> rids = new ArrayList<>();
	List<Extension> exts = new ArrayList<>();
	ByteBuffer m = ByteBuffer.wrap(encoded);

	this.ridListLen = Record.getInt16(m);
	if (m.remaining() < (ridListLen + 2)) {
	throw new SSLProtocolException(
	"Invalid OCSP status request: insufficient data");
	}

	int ridListBytesRemaining = ridListLen;
	while (ridListBytesRemaining >= 2) { // 2: length of responder_id
	byte[] ridBytes = Record.getBytes16(m);
	try {
	rids.add(new ResponderId(ridBytes));
	} catch (IOException ioe) {
	throw new SSLProtocolException(
	"Invalid OCSP status request: invalid responder ID");
	}
	ridListBytesRemaining -= ridBytes.length + 2;
	}

	if (ridListBytesRemaining != 0) {
	throw new SSLProtocolException(
	"Invalid OCSP status request: incomplete data");
	}

	byte[] extListBytes = Record.getBytes16(m);
	this.extListLen = extListBytes.length;
	if (extListLen > 0) {
	try {
	DerInputStream dis = new DerInputStream(extListBytes);
	DerValue[] extSeqContents =
	dis.getSequence(extListBytes.length);
	for (DerValue extDerVal : extSeqContents) {
	exts.add(new sun.security.x509.Extension(extDerVal));
	}
	} catch (IOException ioe) {
	throw new SSLProtocolException(
	"Invalid OCSP status request: invalid extension");
	}
	}

	this.responderIds = rids;
	this.extensions = exts;
	}

	@Override
	public String toString() {
	MessageFormat messageFormat = new MessageFormat(
	"\"certificate status type\": {0}\n" +
	"\"OCSP status request\": '{'\n" +
	"{1}\n" +
	"'}'",
	Locale.ENGLISH);

	MessageFormat requestFormat = new MessageFormat(
	"\"responder_id\": {0}\n" +
	"\"request extensions\": '{'\n" +
	"{1}\n" +
	"'}'",
	Locale.ENGLISH);

	String ridStr = "<empty>";
	if (!responderIds.isEmpty()) {
	ridStr = responderIds.toString();
	}

	String extsStr = "<empty>";
	if (!extensions.isEmpty()) {
	StringBuilder extBuilder = new StringBuilder(512);
	boolean isFirst = true;
	for (Extension ext : this.extensions) {
	if (isFirst) {
	isFirst = false;
	} else {
	extBuilder.append(",\n");
	}
	extBuilder.append(
	"{\n" + Utilities.indent(ext.toString()) + "}");
	}

	extsStr = extBuilder.toString();
	}

	Object[] requestFields = {
	ridStr,
	Utilities.indent(extsStr)
	};
	String ocspStatusRequest = requestFormat.format(requestFields);

	Object[] messageFields = {
	CertStatusRequestType.nameOf(statusType),
	Utilities.indent(ocspStatusRequest)
	};

	return messageFormat.format(messageFields);
	}
	}

	static class CertStatusResponse {
	final byte statusType;
	final byte[] encodedResponse;

	protected CertStatusResponse(byte statusType, byte[] respDer) {
	this.statusType = statusType;
	this.encodedResponse = respDer;
	}

	byte[] toByteArray() throws IOException {
	// Create a byte array large enough to handle the status_type
	// field (1) + OCSP length (3) + OCSP data (variable)
	byte[] outData = new byte[encodedResponse.length + 4];
	ByteBuffer buf = ByteBuffer.wrap(outData);
	Record.putInt8(buf, statusType);
	Record.putBytes24(buf, encodedResponse);
	return buf.array();
	}

	@Override
	public String toString() {
	MessageFormat messageFormat = new MessageFormat(
	"\"certificate status response type\": {0}\n" +
	"\"encoded certificate status\": '{'\n" +
	"{1}\n" +
	"'}'",
	Locale.ENGLISH);

	HexDumpEncoder hexEncoder = new HexDumpEncoder();
	String encoded = hexEncoder.encodeBuffer(encodedResponse);

	Object[] messageFields = {
	CertStatusRequestType.nameOf(statusType),
	Utilities.indent(encoded)
	};

	return messageFormat.format(messageFields);
	}
	}

	static final class OCSPStatusResponse extends CertStatusResponse {
	final OCSPResponse ocspResponse;

	private OCSPStatusResponse(byte statusType,
	byte[] encoded) throws IOException {
	super(statusType, encoded);

	// The DER-encoded OCSP response must not be zero length
	if (encoded == null \|\| encoded.length < 1) {
	throw new SSLProtocolException(
	"Invalid OCSP status response: insufficient data");
	}

	// Otherwise, make an OCSPResponse object from the data
	ocspResponse = new OCSPResponse(encoded);
	}

	@Override
	public String toString() {
	MessageFormat messageFormat = new MessageFormat(
	"\"certificate status response type\": {0}\n" +
	"\"OCSP status response\": '{'\n" +
	"{1}\n" +
	"'}'",
	Locale.ENGLISH);

	Object[] messageFields = {
	CertStatusRequestType.nameOf(statusType),
	Utilities.indent(ocspResponse.toString())
	};

	return messageFormat.format(messageFields);
	}
	}

	/**
	* Network data producer of a "status_request" extension in the
	* ClientHello handshake message.
	*/
	private static final
	class CHCertStatusReqProducer implements HandshakeProducer {
	// Prevent instantiation of this class.
	private CHCertStatusReqProducer() {
	// blank
	}

	@Override
	public byte[] produce(ConnectionContext context,
	HandshakeMessage message) throws IOException {
	// The producing happens in client side only.
	ClientHandshakeContext chc = (ClientHandshakeContext)context;

	if (!chc.sslContext.isStaplingEnabled(true)) {
	return null;
	}

	if (!chc.sslConfig.isAvailable(CH_STATUS_REQUEST)) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine(
	"Ignore unavailable extension: " +
	CH_STATUS_REQUEST.name);
	}
	return null;
	}

	// Produce the extension.
	//
	// We are using empty OCSPStatusRequest at present. May extend to
	// support specific responder or extensions later.
	byte[] extData = new byte[] {0x01, 0x00, 0x00, 0x00, 0x00};

	// Update the context.
	chc.handshakeExtensions.put(
	CH_STATUS_REQUEST, CertStatusRequestSpec.DEFAULT);

	return extData;
	}
	}

	/**
	* Network data consumer of a "status_request" extension in the
	* ClientHello handshake message.
	*/
	private static final
	class CHCertStatusReqConsumer implements ExtensionConsumer {
	// Prevent instantiation of this class.
	private CHCertStatusReqConsumer() {
	// blank
	}

	@Override
	public void consume(ConnectionContext context,
	HandshakeMessage message, ByteBuffer buffer) throws IOException {

	// The consuming happens in server side only.
	ServerHandshakeContext shc = (ServerHandshakeContext)context;

	if (!shc.sslConfig.isAvailable(CH_STATUS_REQUEST)) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine("Ignore unavailable extension: " +
	CH_STATUS_REQUEST.name);
	}
	return; // ignore the extension
	}

	// Parse the extension.
	CertStatusRequestSpec spec;
	try {
	spec = new CertStatusRequestSpec(buffer);
	} catch (IOException ioe) {
	shc.conContext.fatal(Alert.UNEXPECTED_MESSAGE, ioe);
	return; // fatal() always throws, make the compiler happy.
	}

	// Update the context.
	shc.handshakeExtensions.put(CH_STATUS_REQUEST, spec);
	if (!shc.isResumption &&
	!shc.negotiatedProtocol.useTLS13PlusSpec()) {
	shc.handshakeProducers.put(SSLHandshake.CERTIFICATE_STATUS.id,
	SSLHandshake.CERTIFICATE_STATUS);
	} // Otherwise, the certificate status presents in server cert.

	// No impact on session resumption.
	}
	}

	/**
	* Network data producer of a "status_request" extension in the
	* ServerHello handshake message.
	*/
	private static final
	class SHCertStatusReqProducer implements HandshakeProducer {
	// Prevent instantiation of this class.
	private SHCertStatusReqProducer() {
	// blank
	}

	@Override
	public byte[] produce(ConnectionContext context,
	HandshakeMessage message) throws IOException {
	// The producing happens in client side only.
	ServerHandshakeContext shc = (ServerHandshakeContext)context;

	// The StaplingParameters in the ServerHandshakeContext will
	// contain the info about what kind of stapling (if any) to
	// perform and whether this status_request extension should be
	// produced or the status_request_v2 (found in a different producer)
	// No explicit check is required for isStaplingEnabled here. If
	// it is false then stapleParams will be null. If it is true
	// then stapleParams may or may not be false and the check below
	// is sufficient.
	if ((shc.stapleParams == null) \|\|
	(shc.stapleParams.statusRespExt !=
	SSLExtension.CH_STATUS_REQUEST)) {
	return null; // Do not produce status_request in ServerHello
	}

	// In response to "status_request" extension request only.
	CertStatusRequestSpec spec = (CertStatusRequestSpec)
	shc.handshakeExtensions.get(CH_STATUS_REQUEST);
	if (spec == null) {
	// Ignore, no status_request extension requested.
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.finest(
	"Ignore unavailable extension: " +
	CH_STATUS_REQUEST.name);
	}

	return null; // ignore the extension
	}

	// Is it a session resuming?
	if (shc.isResumption) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.finest(
	"No status_request response for session resuming");
	}

	return null; // ignore the extension
	}

	// The "extension_data" in the extended ServerHello handshake
	// message MUST be empty.
	byte[] extData = new byte[0];

	// Update the context.
	shc.handshakeExtensions.put(
	SH_STATUS_REQUEST, CertStatusRequestSpec.DEFAULT);

	return extData;
	}
	}

	/**
	* Network data consumer of a "status_request" extension in the
	* ServerHello handshake message.
	*/
	private static final
	class SHCertStatusReqConsumer implements ExtensionConsumer {
	// Prevent instantiation of this class.
	private SHCertStatusReqConsumer() {
	// blank
	}

	@Override
	public void consume(ConnectionContext context,
	HandshakeMessage message, ByteBuffer buffer) throws IOException {

	// The producing happens in client side only.
	ClientHandshakeContext chc = (ClientHandshakeContext)context;

	// In response to "status_request" extension request only.
	CertStatusRequestSpec requestedCsr = (CertStatusRequestSpec)
	chc.handshakeExtensions.get(CH_STATUS_REQUEST);
	if (requestedCsr == null) {
	chc.conContext.fatal(Alert.UNEXPECTED_MESSAGE,
	"Unexpected status_request extension in ServerHello");
	}

	// Parse the extension.
	if (buffer.hasRemaining()) {
	chc.conContext.fatal(Alert.UNEXPECTED_MESSAGE,
	"Invalid status_request extension in ServerHello message: " +
	"the extension data must be empty");
	}

	// Update the context.
	chc.handshakeExtensions.put(
	SH_STATUS_REQUEST, CertStatusRequestSpec.DEFAULT);
	chc.handshakeConsumers.put(SSLHandshake.CERTIFICATE_STATUS.id,
	SSLHandshake.CERTIFICATE_STATUS);

	// Since we've received a legitimate status_request in the
	// ServerHello, stapling is active if it's been enabled.
	chc.staplingActive = chc.sslContext.isStaplingEnabled(true);

	// No impact on session resumption.
	}
	}

	/**
	* The "status_request_v2" extension.
	*
	* RFC6961 defines the TLS extension,"status_request_v2" (type 0x5),
	* which allows the client to request that the server perform OCSP
	* on the client's behalf.
	*
	* The RFC defines an CertStatusReqItemV2 structure:
	*
	* struct {
	* CertificateStatusType status_type;
	* uint16 request_length;
	* select (status_type) {
	* case ocsp: OCSPStatusRequest;
	* case ocsp_multi: OCSPStatusRequest;
	* } request;
	* } CertificateStatusRequestItemV2;
	*
	* enum { ocsp(1), ocsp_multi(2), (255) } CertificateStatusType;
	* struct {
	* ResponderID responder_id_list<0..2^16-1>;
	* Extensions request_extensions;
	* } OCSPStatusRequest;
	*
	* opaque ResponderID<1..2^16-1>;
	* opaque Extensions<0..2^16-1>;
	*
	* struct {
	* CertificateStatusRequestItemV2
	* certificate_status_req_list<1..2^16-1>;
	* } CertificateStatusRequestListV2;
	*/
	static final class CertStatusRequestV2Spec implements SSLExtensionSpec {
	static final CertStatusRequestV2Spec DEFAULT =
	new CertStatusRequestV2Spec(new CertStatusRequest[] {
	OCSPStatusRequest.EMPTY_OCSP_MULTI});

	final CertStatusRequest[] certStatusRequests;

	private CertStatusRequestV2Spec(CertStatusRequest[] certStatusRequests) {
	this.certStatusRequests = certStatusRequests;
	}

	private CertStatusRequestV2Spec(ByteBuffer message) throws IOException {
	// Is it a empty extension_data?
	if (message.remaining() == 0) {
	// server response
	this.certStatusRequests = new CertStatusRequest[0];
	return;
	}

	if (message.remaining() < 5) { // 2: certificate_status_req_list
	// +1: status_type
	// +2: request_length
	throw new SSLProtocolException(
	"Invalid status_request_v2 extension: insufficient data");
	}

	int listLen = Record.getInt16(message);
	if (listLen <= 0) {
	throw new SSLProtocolException(
	"certificate_status_req_list length must be positive " +
	"(received length: " + listLen + ")");
	}

	int remaining = listLen;
	List<CertStatusRequest> statusRequests = new ArrayList<>();
	while (remaining > 0) {
	byte statusType = (byte)Record.getInt8(message);
	int requestLen = Record.getInt16(message);

	if (message.remaining() < requestLen) {
	throw new SSLProtocolException(
	"Invalid status_request_v2 extension: " +
	"insufficient data (request_length=" + requestLen +
	", remining=" + message.remaining() + ")");
	}

	byte[] encoded = new byte[requestLen];
	if (encoded.length != 0) {
	message.get(encoded);
	}
	remaining -= 3; // 1(status type) + 2(request_length) bytes
	remaining -= requestLen;

	if (statusType == CertStatusRequestType.OCSP.id \|\|
	statusType == CertStatusRequestType.OCSP_MULTI.id) {
	if (encoded.length < 4) {
	// 2: length of responder_id_list
	// +2: length of request_extensions
	throw new SSLProtocolException(
	"Invalid status_request_v2 extension: " +
	"insufficient data");
	}
	statusRequests.add(
	new OCSPStatusRequest(statusType, encoded));
	} else {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.info(
	"Unknown certificate status request " +
	"(status type: " + statusType + ")");
	}
	statusRequests.add(
	new CertStatusRequest(statusType, encoded));
	}
	}

	certStatusRequests =
	statusRequests.toArray(new CertStatusRequest[0]);
	}

	@Override
	public String toString() {
	if (certStatusRequests == null \|\| certStatusRequests.length == 0) {
	return "<empty>";
	} else {
	MessageFormat messageFormat = new MessageFormat(
	"\"cert status request\": '{'\n{0}\n'}'", Locale.ENGLISH);

	StringBuilder builder = new StringBuilder(512);
	boolean isFirst = true;
	for (CertStatusRequest csr : certStatusRequests) {
	if (isFirst) {
	isFirst = false;
	} else {
	builder.append(", ");
	}
	Object[] messageFields = {
	Utilities.indent(csr.toString())
	};
	builder.append(messageFormat.format(messageFields));
	}

	return builder.toString();
	}
	}
	}

	private static final
	class CertStatusRequestsStringizer implements SSLStringizer {
	@Override
	public String toString(ByteBuffer buffer) {
	try {
	return (new CertStatusRequestV2Spec(buffer)).toString();
	} catch (IOException ioe) {
	// For debug logging only, so please swallow exceptions.
	return ioe.getMessage();
	}
	}
	}

	/**
	* Network data producer of a "status_request_v2" extension in the
	* ClientHello handshake message.
	*/
	private static final
	class CHCertStatusReqV2Producer implements HandshakeProducer {
	// Prevent instantiation of this class.
	private CHCertStatusReqV2Producer() {
	// blank
	}

	@Override
	public byte[] produce(ConnectionContext context,
	HandshakeMessage message) throws IOException {
	// The producing happens in client side only.
	ClientHandshakeContext chc = (ClientHandshakeContext)context;

	if (!chc.sslContext.isStaplingEnabled(true)) {
	return null;
	}

	if (!chc.sslConfig.isAvailable(CH_STATUS_REQUEST_V2)) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.finest(
	"Ignore unavailable status_request_v2 extension");
	}

	return null;
	}

	// Produce the extension.
	//
	// We are using empty OCSPStatusRequest at present. May extend to
	// support specific responder or extensions later.
	byte[] extData = new byte[] {
	0x00, 0x07, 0x02, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00};

	// Update the context.
	chc.handshakeExtensions.put(
	CH_STATUS_REQUEST_V2, CertStatusRequestV2Spec.DEFAULT);

	return extData;
	}
	}

	/**
	* Network data consumer of a "status_request_v2" extension in the
	* ClientHello handshake message.
	*/
	private static final
	class CHCertStatusReqV2Consumer implements ExtensionConsumer {
	// Prevent instantiation of this class.
	private CHCertStatusReqV2Consumer() {
	// blank
	}

	@Override
	public void consume(ConnectionContext context,
	HandshakeMessage message, ByteBuffer buffer) throws IOException {

	// The consuming happens in server side only.
	ServerHandshakeContext shc = (ServerHandshakeContext)context;

	if (!shc.sslConfig.isAvailable(CH_STATUS_REQUEST_V2)) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.finest(
	"Ignore unavailable status_request_v2 extension");
	}

	return; // ignore the extension
	}

	// Parse the extension.
	CertStatusRequestV2Spec spec;
	try {
	spec = new CertStatusRequestV2Spec(buffer);
	} catch (IOException ioe) {
	shc.conContext.fatal(Alert.UNEXPECTED_MESSAGE, ioe);
	return; // fatal() always throws, make the compiler happy.
	}

	// Update the context.
	shc.handshakeExtensions.put(CH_STATUS_REQUEST_V2, spec);
	if (!shc.isResumption) {
	shc.handshakeProducers.putIfAbsent(
	SSLHandshake.CERTIFICATE_STATUS.id,
	SSLHandshake.CERTIFICATE_STATUS);
	}

	// No impact on session resumption.
	}
	}

	/**
	* Network data producer of a "status_request_v2" extension in the
	* ServerHello handshake message.
	*/
	private static final
	class SHCertStatusReqV2Producer implements HandshakeProducer {
	// Prevent instantiation of this class.
	private SHCertStatusReqV2Producer() {
	// blank
	}

	@Override
	public byte[] produce(ConnectionContext context,
	HandshakeMessage message) throws IOException {
	// The producing happens in client side only.

	ServerHandshakeContext shc = (ServerHandshakeContext)context;
	// The StaplingParameters in the ServerHandshakeContext will
	// contain the info about what kind of stapling (if any) to
	// perform and whether this status_request extension should be
	// produced or the status_request_v2 (found in a different producer)
	// No explicit check is required for isStaplingEnabled here. If
	// it is false then stapleParams will be null. If it is true
	// then stapleParams may or may not be false and the check below
	// is sufficient.
	if ((shc.stapleParams == null) \|\|
	(shc.stapleParams.statusRespExt !=
	SSLExtension.CH_STATUS_REQUEST_V2)) {
	return null; // Do not produce status_request_v2 in SH
	}

	// In response to "status_request_v2" extension request only
	CertStatusRequestV2Spec spec = (CertStatusRequestV2Spec)
	shc.handshakeExtensions.get(CH_STATUS_REQUEST_V2);
	if (spec == null) {
	// Ignore, no status_request_v2 extension requested.
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.finest(
	"Ignore unavailable status_request_v2 extension");
	}

	return null; // ignore the extension
	}

	// Is it a session resuming?
	if (shc.isResumption) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.finest(
	"No status_request_v2 response for session resumption");
	}
	return null; // ignore the extension
	}

	// The "extension_data" in the extended ServerHello handshake
	// message MUST be empty.
	byte[] extData = new byte[0];

	// Update the context.
	shc.handshakeExtensions.put(
	SH_STATUS_REQUEST_V2, CertStatusRequestV2Spec.DEFAULT);

	return extData;
	}
	}

	/**
	* Network data consumer of a "status_request_v2" extension in the
	* ServerHello handshake message.
	*/
	private static final
	class SHCertStatusReqV2Consumer implements ExtensionConsumer {
	// Prevent instantiation of this class.
	private SHCertStatusReqV2Consumer() {
	// blank
	}

	@Override
	public void consume(ConnectionContext context,
	HandshakeMessage message, ByteBuffer buffer) throws IOException {

	// The consumption happens in client side only.
	ClientHandshakeContext chc = (ClientHandshakeContext)context;

	// In response to "status_request" extension request only
	CertStatusRequestV2Spec requestedCsr = (CertStatusRequestV2Spec)
	chc.handshakeExtensions.get(CH_STATUS_REQUEST_V2);
	if (requestedCsr == null) {
	chc.conContext.fatal(Alert.UNEXPECTED_MESSAGE,
	"Unexpected status_request_v2 extension in ServerHello");
	}

	// Parse the extension.
	if (buffer.hasRemaining()) {
	chc.conContext.fatal(Alert.UNEXPECTED_MESSAGE,
	"Invalid status_request_v2 extension in ServerHello: " +
	"the extension data must be empty");
	}

	// Update the context.
	chc.handshakeExtensions.put(
	SH_STATUS_REQUEST_V2, CertStatusRequestV2Spec.DEFAULT);
	chc.handshakeConsumers.put(SSLHandshake.CERTIFICATE_STATUS.id,
	SSLHandshake.CERTIFICATE_STATUS);

	// Since we've received a legitimate status_request in the
	// ServerHello, stapling is active if it's been enabled.
	chc.staplingActive = chc.sslContext.isStaplingEnabled(true);

	// No impact on session resumption.
	}
	}

	private static final
	class CTCertStatusResponseProducer implements HandshakeProducer {
	// Prevent instantiation of this class.
	private CTCertStatusResponseProducer() {
	// blank
	}

	@Override
	public byte[] produce(ConnectionContext context,
	HandshakeMessage message) throws IOException {
	ServerHandshakeContext shc = (ServerHandshakeContext)context;
	byte[] producedData = null;

	// Stapling needs to be active and have valid data to proceed
	if (shc.stapleParams == null) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.finest(
	"Stapling is disabled for this connection");
	}
	return null;
	}

	// There needs to be a non-null CertificateEntry to proceed
	if (shc.currentCertEntry == null) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.finest("Found null CertificateEntry in context");
	}
	return null;
	}

	// Pull the certificate from the CertificateEntry and find
	// a response from the response map. If one exists we will
	// staple it.
	try {
	CertificateFactory cf = CertificateFactory.getInstance("X.509");
	X509Certificate x509Cert =
	(X509Certificate)cf.generateCertificate(
	new ByteArrayInputStream(
	shc.currentCertEntry.encoded));
	byte[] respBytes = shc.stapleParams.responseMap.get(x509Cert);
	if (respBytes == null) {
	// We're done with this entry. Clear it from the context
	if (SSLLogger.isOn &&
	SSLLogger.isOn("ssl,handshake,verbose")) {
	SSLLogger.finest("No status response found for " +
	x509Cert.getSubjectX500Principal());
	}
	shc.currentCertEntry = null;
	return null;
	}

	// Build a proper response buffer from the stapling information
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake,verbose")) {
	SSLLogger.finest("Found status response for " +
	x509Cert.getSubjectX500Principal() +
	", response length: " + respBytes.length);
	}
	CertStatusResponse certResp = (shc.stapleParams.statReqType ==
	CertStatusRequestType.OCSP) ?
	new OCSPStatusResponse(shc.stapleParams.statReqType.id,
	respBytes) :
	new CertStatusResponse(shc.stapleParams.statReqType.id,
	respBytes);
	producedData = certResp.toByteArray();
	} catch (CertificateException ce) {
	shc.conContext.fatal(Alert.BAD_CERTIFICATE,
	"Failed to parse server certificates", ce);
	} catch (IOException ioe) {
	shc.conContext.fatal(Alert.BAD_CERT_STATUS_RESPONSE,
	"Failed to parse certificate status response", ioe);
	}

	// Clear the pinned CertificateEntry from the context
	shc.currentCertEntry = null;
	return producedData;
	}
	}

	private static final
	class CTCertStatusResponseConsumer implements ExtensionConsumer {
	// Prevent instantiation of this class.
	private CTCertStatusResponseConsumer() {
	// blank
	}

	@Override
	public void consume(ConnectionContext context,
	HandshakeMessage message, ByteBuffer buffer) throws IOException {
	// The consumption happens in client side only.
	ClientHandshakeContext chc = (ClientHandshakeContext)context;

	// Parse the extension.
	CertStatusResponseSpec spec;
	try {
	spec = new CertStatusResponseSpec(buffer);
	} catch (IOException ioe) {
	chc.conContext.fatal(Alert.DECODE_ERROR, ioe);
	return; // fatal() always throws, make the compiler happy.
	}

	if (chc.sslContext.isStaplingEnabled(true)) {
	// Activate stapling
	chc.staplingActive = true;
	} else {
	// Do no further processing of stapled responses
	return;
	}

	// Get response list from the session. This is unmodifiable
	// so we need to create a new list. Then add this new response
	// to the end and submit it back to the session object.
	if ((chc.handshakeSession != null) && (!chc.isResumption)) {
	List<byte[]> respList = new ArrayList<>(
	chc.handshakeSession.getStatusResponses());
	respList.add(spec.statusResponse.encodedResponse);
	chc.handshakeSession.setStatusResponses(respList);
	} else {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake,verbose")) {
	SSLLogger.finest(
	"Ignoring stapled data on resumed session");
	}
	}
	}
	}
	}

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