jdk/src/share/classes/com/sun/media/sound/JSSecurityManager.java
author serb
Thu, 07 Aug 2014 17:02:48 +0400
changeset 26030 576ffa819e23
parent 23889 c8412b2715b5
permissions -rw-r--r--
8054372: Cleanup of com.sun.media.sound packages Reviewed-by: azvegint, prr
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/*
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 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package com.sun.media.sound;
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import java.io.BufferedInputStream;
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import java.io.InputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Properties;
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import java.util.ServiceLoader;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import javax.sound.sampled.AudioPermission;
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/** Managing security in the Java Sound implementation.
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 * This class contains all code that uses and is used by
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 * SecurityManager.doPrivileged().
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 *
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 * @author Matthias Pfisterer
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 */
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final class JSSecurityManager {
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    /** Prevent instantiation.
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     */
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    private JSSecurityManager() {
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    }
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    /** Checks if the VM currently has a SecurityManager installed.
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     * Note that this may change over time. So the result of this method
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     * should not be cached.
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     *
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     * @return true if a SecurityManger is installed, false otherwise.
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     */
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    private static boolean hasSecurityManager() {
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        return (System.getSecurityManager() != null);
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    }
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    static void checkRecordPermission() throws SecurityException {
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        if(Printer.trace) Printer.trace("JSSecurityManager.checkRecordPermission()");
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        SecurityManager sm = System.getSecurityManager();
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        if (sm != null) {
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            sm.checkPermission(new AudioPermission("record"));
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        }
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    }
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    /** Load properties from a file.
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        This method tries to load properties from the filename give into
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        the passed properties object.
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        If the file cannot be found or something else goes wrong,
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        the method silently fails.
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        @param properties The properties bundle to store the values of the
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        properties file.
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        @param filename The filename of the properties file to load. This
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        filename is interpreted as relative to the subdirectory "lib" in
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        the JRE directory.
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     */
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    static void loadProperties(final Properties properties,
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                               final String filename) {
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        if(hasSecurityManager()) {
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            try {
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                // invoke the privileged action using 1.2 security
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                PrivilegedAction<Void> action = new PrivilegedAction<Void>() {
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                        public Void run() {
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                            loadPropertiesImpl(properties, filename);
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                            return null;
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                        }
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                    };
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                AccessController.doPrivileged(action);
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                if(Printer.debug)Printer.debug("Loaded properties with JDK 1.2 security");
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            } catch (Exception e) {
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                if(Printer.debug)Printer.debug("Exception loading properties with JDK 1.2 security");
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                // try without using JDK 1.2 security
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                loadPropertiesImpl(properties, filename);
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            }
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        } else {
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            // not JDK 1.2 security, assume we already have permission
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            loadPropertiesImpl(properties, filename);
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        }
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    }
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    private static void loadPropertiesImpl(Properties properties,
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                                           String filename) {
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        if(Printer.trace)Printer.trace(">> JSSecurityManager: loadPropertiesImpl()");
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        String fname = System.getProperty("java.home");
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        try {
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            if (fname == null) {
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                throw new Error("Can't find java.home ??");
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            }
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            File f = new File(fname, "lib");
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            f = new File(f, filename);
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            fname = f.getCanonicalPath();
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            InputStream in = new FileInputStream(fname);
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            BufferedInputStream bin = new BufferedInputStream(in);
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            try {
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                properties.load(bin);
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            } finally {
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                if (in != null) {
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                    in.close();
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                }
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            }
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        } catch (Throwable t) {
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            if (Printer.trace) {
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                System.err.println("Could not load properties file \"" + fname + "\"");
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                t.printStackTrace();
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            }
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        }
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        if(Printer.trace)Printer.trace("<< JSSecurityManager: loadPropertiesImpl() completed");
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    }
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    /** Create a Thread in the current ThreadGroup.
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     */
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    static Thread createThread(final Runnable runnable,
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                               final String threadName,
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                               final boolean isDaemon, final int priority,
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                               final boolean doStart) {
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        Thread thread = new Thread(runnable);
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        if (threadName != null) {
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            thread.setName(threadName);
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        }
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        thread.setDaemon(isDaemon);
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        if (priority >= 0) {
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            thread.setPriority(priority);
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        }
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        if (doStart) {
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            thread.start();
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        }
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        return thread;
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    }
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    static synchronized <T> List<T> getProviders(final Class<T> providerClass) {
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        List<T> p = new ArrayList<>(7);
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        // ServiceLoader creates "lazy" iterator instance, but it ensures that
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        // next/hasNext run with permissions that are restricted by whatever
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        // creates the ServiceLoader instance, so it requires to be called from
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        // privileged section
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        final PrivilegedAction<Iterator<T>> psAction =
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                new PrivilegedAction<Iterator<T>>() {
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                    @Override
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                    public Iterator<T> run() {
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                        return ServiceLoader.load(providerClass).iterator();
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                    }
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                };
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        final Iterator<T> ps = AccessController.doPrivileged(psAction);
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        // the iterator's hasNext() method looks through classpath for
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        // the provider class names, so it requires read permissions
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        PrivilegedAction<Boolean> hasNextAction = new PrivilegedAction<Boolean>() {
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            public Boolean run() {
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                return ps.hasNext();
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            }
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        };
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        while (AccessController.doPrivileged(hasNextAction)) {
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            try {
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                // the iterator's next() method creates instances of the
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                // providers and it should be called in the current security
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                // context
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                T provider = ps.next();
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                if (providerClass.isInstance(provider)) {
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                    // $$mp 2003-08-22
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                    // Always adding at the beginning reverses the
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                    // order of the providers. So we no longer have
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                    // to do this in AudioSystem and MidiSystem.
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                    p.add(0, provider);
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                }
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            } catch (Throwable t) {
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                //$$fb 2002-11-07: do not fail on SPI not found
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                if (Printer.err) t.printStackTrace();
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            }
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        }
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        return p;
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    }
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}