/*

 * 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.io.IOException;

import java.nio.ByteBuffer;

import java.util.List;

import sun.security.ssl.SSLExtension.ExtensionConsumer;

import sun.security.ssl.SSLHandshake.HandshakeMessage;

import sun.security.ssl.SignatureAlgorithmsExtension.SignatureSchemesSpec;

/**

 * Pack of the "signature_algorithms_cert" extensions.

 */

final class CertSignAlgsExtension {

    static final HandshakeProducer chNetworkProducer =

            new CHCertSignatureSchemesProducer();

    static final ExtensionConsumer chOnLoadConsumer =

            new CHCertSignatureSchemesConsumer();

    static final HandshakeConsumer chOnTradeConsumer =

            new CHCertSignatureSchemesUpdate();

    static final HandshakeProducer crNetworkProducer =

            new CRCertSignatureSchemesProducer();

    static final ExtensionConsumer crOnLoadConsumer =

            new CRCertSignatureSchemesConsumer();

    static final HandshakeConsumer crOnTradeConsumer =

            new CRCertSignatureSchemesUpdate();

    static final SSLStringizer ssStringizer =

            new CertSignatureSchemesStringizer();

    private static final

            class CertSignatureSchemesStringizer implements SSLStringizer {

        @Override

        public String toString(ByteBuffer buffer) {

            try {

                return (new SignatureSchemesSpec(buffer)).toString();

            } catch (IOException ioe) {

                // For debug logging only, so please swallow exceptions.

                return ioe.getMessage();

            }

        }

    }

    /**

     * Network data producer of a "signature_algorithms_cert" extension in

     * the ClientHello handshake message.

     */

    private static final

            class CHCertSignatureSchemesProducer implements HandshakeProducer {

        // Prevent instantiation of this class.

        private CHCertSignatureSchemesProducer() {

            // blank

        }

        @Override

        public byte[] produce(ConnectionContext context,

                HandshakeMessage message) throws IOException {

            // The producing happens in client side only.

            ClientHandshakeContext chc = (ClientHandshakeContext)context;

            // Is it a supported and enabled extension?

            if (!chc.sslConfig.isAvailable(

                    SSLExtension.CH_SIGNATURE_ALGORITHMS_CERT)) {

                if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {

                    SSLLogger.fine(

                            "Ignore unavailable " +

                            "signature_algorithms_cert extension");

                }

                return null;    // ignore the extension

            }

            // Produce the extension.

            if (chc.localSupportedSignAlgs == null) {

                chc.localSupportedSignAlgs =

                    SignatureScheme.getSupportedAlgorithms(

                            chc.algorithmConstraints, chc.activeProtocols);

            }

            int vectorLen = SignatureScheme.sizeInRecord() *

                    chc.localSupportedSignAlgs.size();

            byte[] extData = new byte[vectorLen + 2];

            ByteBuffer m = ByteBuffer.wrap(extData);

            Record.putInt16(m, vectorLen);

            for (SignatureScheme ss : chc.localSupportedSignAlgs) {

                Record.putInt16(m, ss.id);

            }

            // Update the context.

            chc.handshakeExtensions.put(

                    SSLExtension.CH_SIGNATURE_ALGORITHMS_CERT,

                    new SignatureSchemesSpec(chc.localSupportedSignAlgs));

            return extData;

        }

    }

    /**

     * Network data consumer of a "signature_algorithms_cert" extension in

     * the ClientHello handshake message.

     */

    private static final

            class CHCertSignatureSchemesConsumer implements ExtensionConsumer {

        // Prevent instantiation of this class.

        private CHCertSignatureSchemesConsumer() {

            // blank

        }

        @Override

        public void consume(ConnectionContext context,

            HandshakeMessage message, ByteBuffer buffer) throws IOException {

            // The consuming happens in server side only.

            ServerHandshakeContext shc = (ServerHandshakeContext)context;

            // Is it a supported and enabled extension?

            if (!shc.sslConfig.isAvailable(

                    SSLExtension.CH_SIGNATURE_ALGORITHMS_CERT)) {

                if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {

                    SSLLogger.fine(

                            "Ignore unavailable " +

                            "signature_algorithms_cert extension");

                }

                return;     // ignore the extension

            }

            // Parse the extension.

            SignatureSchemesSpec spec;

            try {

                spec = new SignatureSchemesSpec(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(

                    SSLExtension.CH_SIGNATURE_ALGORITHMS_CERT, spec);

            // No impact on session resumption.

        }

    }

    /**

     * After session creation consuming of a "signature_algorithms_cert"

     * extension in the ClientHello handshake message.

     */

    private static final class CHCertSignatureSchemesUpdate

            implements HandshakeConsumer {

        // Prevent instantiation of this class.

        private CHCertSignatureSchemesUpdate() {

            // blank

        }

        @Override

        public void consume(ConnectionContext context,

                HandshakeMessage message) throws IOException {

            // The consuming happens in server side only.

            ServerHandshakeContext shc = (ServerHandshakeContext)context;

            SignatureSchemesSpec spec = (SignatureSchemesSpec)

                    shc.handshakeExtensions.get(

                            SSLExtension.CH_SIGNATURE_ALGORITHMS_CERT);

            if (spec == null) {

                // Ignore, no signature_algorithms_cert extension requested.

                return;

            }

            // update the context

                    SignatureScheme.getSupportedAlgorithms(

                            shc.algorithmConstraints, shc.negotiatedProtocol,

                            spec.signatureSchemes);

            if (!shc.isResumption && shc.negotiatedProtocol.useTLS13PlusSpec()) {

                if (shc.sslConfig.clientAuthType !=

                        ClientAuthType.CLIENT_AUTH_NONE) {

                    shc.handshakeProducers.putIfAbsent(

                            SSLHandshake.CERTIFICATE_REQUEST.id,

                            SSLHandshake.CERTIFICATE_REQUEST);

                }

                shc.handshakeProducers.put(SSLHandshake.CERTIFICATE.id,

                        SSLHandshake.CERTIFICATE);

                shc.handshakeProducers.putIfAbsent(

                        SSLHandshake.CERTIFICATE_VERIFY.id,

                        SSLHandshake.CERTIFICATE_VERIFY);

            }

        }

    }

    /**

     * Network data producer of a "signature_algorithms_cert" extension in

     * the CertificateRequest handshake message.

     */

    private static final

            class CRCertSignatureSchemesProducer implements HandshakeProducer {

        // Prevent instantiation of this class.

        private CRCertSignatureSchemesProducer() {

            // blank

        }

        @Override

        public byte[] produce(ConnectionContext context,

                HandshakeMessage message) throws IOException {

            // The producing happens in server side only.

            ServerHandshakeContext shc = (ServerHandshakeContext)context;

            // Is it a supported and enabled extension?

            if (!shc.sslConfig.isAvailable(

                    SSLExtension.CH_SIGNATURE_ALGORITHMS_CERT)) {

                if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {

                    SSLLogger.fine(

                            "Ignore unavailable " +

                            "signature_algorithms_cert extension");

                }

                return null;    // ignore the extension

            }

            // Produce the extension.

            if (shc.localSupportedSignAlgs == null) {

                shc.localSupportedSignAlgs =

                    SignatureScheme.getSupportedAlgorithms(

                            shc.algorithmConstraints, shc.activeProtocols);

            }

            int vectorLen = SignatureScheme.sizeInRecord() *

                    shc.localSupportedSignAlgs.size();

            byte[] extData = new byte[vectorLen + 2];

            ByteBuffer m = ByteBuffer.wrap(extData);

            Record.putInt16(m, vectorLen);

            for (SignatureScheme ss : shc.localSupportedSignAlgs) {

                Record.putInt16(m, ss.id);

            }

            // Update the context.

            shc.handshakeExtensions.put(

                    SSLExtension.CR_SIGNATURE_ALGORITHMS_CERT,

                    new SignatureSchemesSpec(shc.localSupportedSignAlgs));

            return extData;

        }

    }

    /**

     * Network data consumer of a "signature_algorithms_cert" extension in

     * the CertificateRequest handshake message.

     */

    private static final

            class CRCertSignatureSchemesConsumer implements ExtensionConsumer {

        // Prevent instantiation of this class.

        private CRCertSignatureSchemesConsumer() {

            // blank

        }

        @Override

        public void consume(ConnectionContext context,

            HandshakeMessage message, ByteBuffer buffer) throws IOException {

            // The consuming happens in client side only.

            ClientHandshakeContext chc = (ClientHandshakeContext)context;

            // Is it a supported and enabled extension?

            if (!chc.sslConfig.isAvailable(

                    SSLExtension.CH_SIGNATURE_ALGORITHMS_CERT)) {

                if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {

                    SSLLogger.fine(

                            "Ignore unavailable " +

                            "signature_algorithms_cert extension");

                }

                return;     // ignore the extension

            }

            // Parse the extension.

            SignatureSchemesSpec spec;

            try {

                spec = new SignatureSchemesSpec(buffer);

            } catch (IOException ioe) {

                chc.conContext.fatal(Alert.UNEXPECTED_MESSAGE, ioe);

                return;     // fatal() always throws, make the compiler happy.

            }

            // Update the context.

            chc.handshakeExtensions.put(

                    SSLExtension.CR_SIGNATURE_ALGORITHMS_CERT, spec);

            // No impact on session resumption.

        }

    }

    /**

     * After session creation consuming of a "signature_algorithms_cert"

     * extension in the CertificateRequest handshake message.

     */

    private static final class CRCertSignatureSchemesUpdate

            implements HandshakeConsumer {

        // Prevent instantiation of this class.

        private CRCertSignatureSchemesUpdate() {

            // blank

        }

        @Override

        public void consume(ConnectionContext context,

                HandshakeMessage message) throws IOException {

            // The consuming happens in client side only.

            ClientHandshakeContext chc = (ClientHandshakeContext)context;

            SignatureSchemesSpec spec = (SignatureSchemesSpec)

                    chc.handshakeExtensions.get(

                            SSLExtension.CR_SIGNATURE_ALGORITHMS_CERT);

            if (spec == null) {

                // Ignore, no "signature_algorithms_cert" extension requested.

                return;

            }

            // update the context

                    SignatureScheme.getSupportedAlgorithms(

                            chc.algorithmConstraints, chc.negotiatedProtocol,

                            spec.signatureSchemes);

        }

    }

}