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 * Copyright (c) 1998, 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
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 */

package com.sun.crypto.provider;

import sun.misc.ObjectInputFilter;
import sun.misc.SharedSecrets;

import java.io.*;
import java.security.*;
import javax.crypto.*;

final class SealedObjectForKeyProtector extends SealedObject {

    static final long serialVersionUID = -3650226485480866989L;

    
The InputStreamFilter for a Key object inside this SealedObject. It can be either provided as a Security property or a system property (when provided as latter, it shadows the former). If the result of this filter is UNDECIDED, the system level filter defined by jdk.serialFilter will be consulted. The value of this property uses the same format of jdk.serialFilter. /**
     * The InputStreamFilter for a Key object inside this SealedObject. It can
     * be either provided as a {@link Security} property or a system property
     * (when provided as latter, it shadows the former). If the result of this
     * filter is {@link sun.misc.ObjectInputFilter.Status.UNDECIDED}, the system
     * level filter defined by jdk.serialFilter will be consulted. The value
     * of this property uses the same format of jdk.serialFilter.
     */
    private static final String KEY_SERIAL_FILTER = "jceks.key.serialFilter";

    SealedObjectForKeyProtector(Serializable object, Cipher c)
            throws IOException, IllegalBlockSizeException {
        super(object, c);
    }

    SealedObjectForKeyProtector(SealedObject so) {
        super(so);
    }

    AlgorithmParameters getParameters() {
        AlgorithmParameters params = null;
        if (super.encodedParams != null) {
            try {
                params = AlgorithmParameters.getInstance("PBE",
                    SunJCE.getInstance());
                params.init(super.encodedParams);
            } catch (NoSuchAlgorithmException nsae) {
                throw new RuntimeException(
                    "SunJCE provider is not configured properly");
            } catch (IOException io) {
                throw new RuntimeException("Parameter failure: "+
                    io.getMessage());
            }
        }
        return params;
    }

    final Key getKey(Cipher c, int maxLength)
            throws IOException, ClassNotFoundException, IllegalBlockSizeException,
            BadPaddingException {

        try (ObjectInputStream ois = SharedSecrets.getJavaxCryptoSealedObjectAccess()
                .getExtObjectInputStream(this, c)) {
            AccessController.doPrivileged(
                    (PrivilegedAction<Void>) () -> {
                        ObjectInputFilter.Config.setObjectInputFilter(ois,
                                new DeserializationChecker(maxLength));
                        return null;
                    });
            try {
                @SuppressWarnings("unchecked")
                Key t = (Key) ois.readObject();
                return t;
            } catch (InvalidClassException ice) {
                String msg = ice.getMessage();
                if (msg.contains("REJECTED")) {
                    throw new IOException("Rejected by the"
                            + " jceks.key.serialFilter or jdk.serialFilter"
                            + " property", ice);
                } else {
                    throw ice;
                }
            }
        }
    }

    
The filter for the content of a SealedObjectForKeyProtector.
First, the jceks.key.serialFilter will be consulted. If the result
is UNDECIDED, the system level jdk.serialFilter will be consulted.
/**
     * The filter for the content of a SealedObjectForKeyProtector.
     *
     * First, the jceks.key.serialFilter will be consulted. If the result
     * is UNDECIDED, the system level jdk.serialFilter will be consulted.
     */
    private static class DeserializationChecker implements ObjectInputFilter {

        private static final ObjectInputFilter OWN_FILTER;

        static {
            String prop = AccessController.doPrivileged(
                    (PrivilegedAction<String>) () -> {
                        String tmp = System.getProperty(KEY_SERIAL_FILTER);
                        if (tmp != null) {
                            return tmp;
                        } else {
                            return Security.getProperty(KEY_SERIAL_FILTER);
                        }
                    });
            OWN_FILTER = prop == null
                    ? null
                    : ObjectInputFilter.Config.createFilter(prop);
        }

        // Maximum possible length of anything inside
        private final int maxLength;

        private DeserializationChecker(int maxLength) {
            this.maxLength = maxLength;
        }

        @Override
        public ObjectInputFilter.Status checkInput(
                ObjectInputFilter.FilterInfo info) {

            if (info.arrayLength() > maxLength) {
                return Status.REJECTED;
            }

            if (info.serialClass() == Object.class) {
                return Status.UNDECIDED;
            }

            if (OWN_FILTER != null) {
                Status result = OWN_FILTER.checkInput(info);
                if (result != Status.UNDECIDED) {
                    return result;
                }
            }

            ObjectInputFilter defaultFilter =
                    ObjectInputFilter.Config.getSerialFilter();
            if (defaultFilter != null) {
                return defaultFilter.checkInput(info);
            }

            return Status.UNDECIDED;
        }
    }
}