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	/*
	* Copyright (c) 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.security.PrivateKey;
	import java.security.PublicKey;
	import java.security.cert.X509Certificate;
	import java.security.interfaces.ECKey;
	import java.security.interfaces.ECPublicKey;
	import java.security.spec.ECParameterSpec;
	import java.util.AbstractMap.SimpleImmutableEntry;
	import java.util.Map;
	import javax.net.ssl.SSLEngine;
	import javax.net.ssl.SSLSocket;
	import javax.net.ssl.X509ExtendedKeyManager;
	import sun.security.ssl.SupportedGroupsExtension.NamedGroup;
	import sun.security.ssl.SupportedGroupsExtension.SupportedGroups;

	enum X509Authentication implements SSLAuthentication {
	// Require rsaEncryption public key
	RSA ("RSA", new X509PossessionGenerator(
	new String[]{"RSA"})),

	// Require RSASSA-PSS public key
	RSASSA_PSS ("RSASSA-PSS", new X509PossessionGenerator(
	new String[] {"RSASSA-PSS"})),

	// Require rsaEncryption or RSASSA-PSS public key
	//
	// Note that this is a specifical scheme for TLS 1.2. (EC)DHE_RSA cipher
	// suites of TLS 1.2 can use either rsaEncryption or RSASSA-PSS public
	// key for authentication and handshake.
	RSA_OR_PSS ("RSA_OR_PSS", new X509PossessionGenerator(
	new String[] {"RSA", "RSASSA-PSS"})),

	// Require DSA public key
	DSA ("DSA", new X509PossessionGenerator(
	new String[] {"DSA"})),

	// Require EC public key
	EC ("EC", new X509PossessionGenerator(
	new String[] {"EC"}));

	final String keyType;
	final SSLPossessionGenerator possessionGenerator;

	private X509Authentication(String keyType,
	SSLPossessionGenerator possessionGenerator) {
	this.keyType = keyType;
	this.possessionGenerator = possessionGenerator;
	}

	static X509Authentication valueOf(SignatureScheme signatureScheme) {
	for (X509Authentication au : X509Authentication.values()) {
	if (au.keyType.equals(signatureScheme.keyAlgorithm)) {
	return au;
	}
	}

	return null;
	}

	@Override
	public SSLPossession createPossession(HandshakeContext handshakeContext) {
	return possessionGenerator.createPossession(handshakeContext);
	}

	@Override
	public SSLHandshake[] getRelatedHandshakers(
	HandshakeContext handshakeContext) {
	if (!handshakeContext.negotiatedProtocol.useTLS13PlusSpec()) {
	return new SSLHandshake[] {
	SSLHandshake.CERTIFICATE,
	SSLHandshake.CERTIFICATE_REQUEST
	};
	} // Otherwise, TLS 1.3 does not use this method.

	return new SSLHandshake[0];
	}

	@SuppressWarnings({"unchecked", "rawtypes"})
	@Override
	public Map.Entry<Byte, HandshakeProducer>[] getHandshakeProducers(
	HandshakeContext handshakeContext) {
	if (!handshakeContext.negotiatedProtocol.useTLS13PlusSpec()) {
	return (Map.Entry<Byte, HandshakeProducer>[])(new Map.Entry[] {
	new SimpleImmutableEntry<Byte, HandshakeProducer>(
	SSLHandshake.CERTIFICATE.id,
	SSLHandshake.CERTIFICATE
	)
	});
	} // Otherwise, TLS 1.3 does not use this method.

	return (Map.Entry<Byte, HandshakeProducer>[])(new Map.Entry[0]);
	}

	static final class X509Possession implements SSLPossession {
	// Proof of possession of the private key corresponding to the public
	// key for which a certificate is being provided for authentication.
	final X509Certificate[] popCerts;
	final PrivateKey popPrivateKey;

	X509Possession(PrivateKey popPrivateKey,
	X509Certificate[] popCerts) {
	this.popCerts = popCerts;
	this.popPrivateKey = popPrivateKey;
	}

	ECParameterSpec getECParameterSpec() {
	if (popPrivateKey == null \|\|
	!"EC".equals(popPrivateKey.getAlgorithm())) {
	return null;
	}

	if (popPrivateKey instanceof ECKey) {
	return ((ECKey)popPrivateKey).getParams();
	} else if (popCerts != null && popCerts.length != 0) {
	// The private key not extractable, get the parameters from
	// the X.509 certificate.
	PublicKey publicKey = popCerts[0].getPublicKey();
	if (publicKey instanceof ECKey) {
	return ((ECKey)publicKey).getParams();
	}
	}

	return null;
	}
	}

	static final class X509Credentials implements SSLCredentials {
	final X509Certificate[] popCerts;
	final PublicKey popPublicKey;

	X509Credentials(PublicKey popPublicKey, X509Certificate[] popCerts) {
	this.popCerts = popCerts;
	this.popPublicKey = popPublicKey;
	}
	}

	private static final
	class X509PossessionGenerator implements SSLPossessionGenerator {
	private final String[] keyTypes;

	private X509PossessionGenerator(String[] keyTypes) {
	this.keyTypes = keyTypes;
	}

	@Override
	public SSLPossession createPossession(HandshakeContext context) {
	if (context.sslConfig.isClientMode) {
	for (String keyType : keyTypes) {
	SSLPossession poss = createClientPossession(
	(ClientHandshakeContext)context, keyType);
	if (poss != null) {
	return poss;
	}
	}
	} else {
	for (String keyType : keyTypes) {
	SSLPossession poss = createServerPossession(
	(ServerHandshakeContext)context, keyType);
	if (poss != null) {
	return poss;
	}
	}
	}

	return null;
	}

	// Used by TLS 1.2 and TLS 1.3.
	private SSLPossession createClientPossession(
	ClientHandshakeContext chc, String keyType) {
	X509ExtendedKeyManager km = chc.sslContext.getX509KeyManager();
	String clientAlias = null;
	if (chc.conContext.transport instanceof SSLSocketImpl) {
	clientAlias = km.chooseClientAlias(
	new String[] { keyType },
	chc.peerSupportedAuthorities,
	(SSLSocket)chc.conContext.transport);
	} else if (chc.conContext.transport instanceof SSLEngineImpl) {
	clientAlias = km.chooseEngineClientAlias(
	new String[] { keyType },
	chc.peerSupportedAuthorities,
	(SSLEngine)chc.conContext.transport);
	}

	if (clientAlias == null) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
	SSLLogger.finest("No X.509 cert selected for " + keyType);
	}
	return null;
	}

	PrivateKey clientPrivateKey = km.getPrivateKey(clientAlias);
	if (clientPrivateKey == null) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
	SSLLogger.finest(
	clientAlias + " is not a private key entry");
	}
	return null;
	}

	X509Certificate[] clientCerts = km.getCertificateChain(clientAlias);
	if ((clientCerts == null) \|\| (clientCerts.length == 0)) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
	SSLLogger.finest(clientAlias +
	" is a private key entry with no cert chain stored");
	}
	return null;
	}

	PublicKey clientPublicKey = clientCerts[0].getPublicKey();
	if ((!clientPrivateKey.getAlgorithm().equals(keyType))
	\|\| (!clientPublicKey.getAlgorithm().equals(keyType))) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
	SSLLogger.fine(
	clientAlias + " private or public key is not of " +
	keyType + " algorithm");
	}
	return null;
	}

	return new X509Possession(clientPrivateKey, clientCerts);
	}

	private SSLPossession createServerPossession(
	ServerHandshakeContext shc, String keyType) {
	X509ExtendedKeyManager km = shc.sslContext.getX509KeyManager();
	String serverAlias = null;
	if (shc.conContext.transport instanceof SSLSocketImpl) {
	serverAlias = km.chooseServerAlias(keyType,
	null, (SSLSocket)shc.conContext.transport);
	} else if (shc.conContext.transport instanceof SSLEngineImpl) {
	serverAlias = km.chooseEngineServerAlias(keyType,
	null, (SSLEngine)shc.conContext.transport);
	}

	if (serverAlias == null) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
	SSLLogger.finest("No X.509 cert selected for " + keyType);
	}
	return null;
	}

	PrivateKey serverPrivateKey = km.getPrivateKey(serverAlias);
	if (serverPrivateKey == null) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
	SSLLogger.finest(
	serverAlias + " is not a private key entry");
	}
	return null;
	}

	X509Certificate[] serverCerts = km.getCertificateChain(serverAlias);
	if ((serverCerts == null) \|\| (serverCerts.length == 0)) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
	SSLLogger.finest(
	serverAlias + " is not a certificate entry");
	}
	return null;
	}

	PublicKey serverPublicKey = serverCerts[0].getPublicKey();
	if ((!serverPrivateKey.getAlgorithm().equals(keyType))
	\|\| (!serverPublicKey.getAlgorithm().equals(keyType))) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
	SSLLogger.fine(
	serverAlias + " private or public key is not of " +
	keyType + " algorithm");
	}
	return null;
	}

	// For TLS 1.2 and prior versions, the public key of a EC cert
	// MUST use a curve and point format supported by the client.
	// But for TLS 1.3, signature algorithms are negotiated
	// independently via the "signature_algorithms" extension.
	if (!shc.negotiatedProtocol.useTLS13PlusSpec() &&
	keyType.equals("EC")) {
	if (!(serverPublicKey instanceof ECPublicKey)) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
	SSLLogger.warning(serverAlias +
	" public key is not an instance of ECPublicKey");
	}
	return null;
	}

	// For ECC certs, check whether we support the EC domain
	// parameters. If the client sent a supported_groups
	// ClientHello extension, check against that too for
	// TLS 1.2 and prior versions.
	ECParameterSpec params =
	((ECPublicKey)serverPublicKey).getParams();
	NamedGroup namedGroup = NamedGroup.valueOf(params);
	if ((namedGroup == null) \|\|
	(!SupportedGroups.isSupported(namedGroup)) \|\|
	((shc.clientRequestedNamedGroups != null) &&
	!shc.clientRequestedNamedGroups.contains(namedGroup))) {

	if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
	SSLLogger.warning(
	"Unsupported named group (" + namedGroup +
	") used in the " + serverAlias + " certificate");
	}

	return null;
	}
	}

	return new X509Possession(serverPrivateKey, serverCerts);
	}
	}
	}

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