| /* |
| * Copyright (c) 1999, 2015, 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 com.sun.media.sound; |
| |
| import java.io.BufferedInputStream; |
| import java.io.InputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Properties; |
| import java.util.ServiceLoader; |
| |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| |
| import javax.sound.sampled.AudioPermission; |
| |
| /** Managing security in the Java Sound implementation. |
| * This class contains all code that uses and is used by |
| * SecurityManager.doPrivileged(). |
| * |
| * @author Matthias Pfisterer |
| */ |
| final class JSSecurityManager { |
| |
| /** Prevent instantiation. |
| */ |
| private JSSecurityManager() { |
| } |
| |
| /** Checks if the VM currently has a SecurityManager installed. |
| * Note that this may change over time. So the result of this method |
| * should not be cached. |
| * |
| * @return true if a SecurityManger is installed, false otherwise. |
| */ |
| private static boolean hasSecurityManager() { |
| return (System.getSecurityManager() != null); |
| } |
| |
| |
| static void checkRecordPermission() throws SecurityException { |
| if(Printer.trace) Printer.trace("JSSecurityManager.checkRecordPermission()"); |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| sm.checkPermission(new AudioPermission("record")); |
| } |
| } |
| |
| /** Load properties from a file. |
| This method tries to load properties from the filename give into |
| the passed properties object. |
| If the file cannot be found or something else goes wrong, |
| the method silently fails. |
| @param properties The properties bundle to store the values of the |
| properties file. |
| @param filename The filename of the properties file to load. This |
| filename is interpreted as relative to the subdirectory "conf" in |
| the JRE directory. |
| */ |
| static void loadProperties(final Properties properties, |
| final String filename) { |
| if(hasSecurityManager()) { |
| try { |
| // invoke the privileged action using 1.2 security |
| PrivilegedAction<Void> action = new PrivilegedAction<Void>() { |
| public Void run() { |
| loadPropertiesImpl(properties, filename); |
| return null; |
| } |
| }; |
| AccessController.doPrivileged(action); |
| if(Printer.debug)Printer.debug("Loaded properties with JDK 1.2 security"); |
| } catch (Exception e) { |
| if(Printer.debug)Printer.debug("Exception loading properties with JDK 1.2 security"); |
| // try without using JDK 1.2 security |
| loadPropertiesImpl(properties, filename); |
| } |
| } else { |
| // not JDK 1.2 security, assume we already have permission |
| loadPropertiesImpl(properties, filename); |
| } |
| } |
| |
| |
| private static void loadPropertiesImpl(Properties properties, |
| String filename) { |
| if(Printer.trace)Printer.trace(">> JSSecurityManager: loadPropertiesImpl()"); |
| String fname = System.getProperty("java.home"); |
| try { |
| if (fname == null) { |
| throw new Error("Can't find java.home ??"); |
| } |
| File f = new File(fname, "conf"); |
| f = new File(f, filename); |
| fname = f.getCanonicalPath(); |
| InputStream in = new FileInputStream(fname); |
| BufferedInputStream bin = new BufferedInputStream(in); |
| try { |
| properties.load(bin); |
| } finally { |
| if (in != null) { |
| in.close(); |
| } |
| } |
| } catch (Throwable t) { |
| if (Printer.trace) { |
| System.err.println("Could not load properties file \"" + fname + "\""); |
| t.printStackTrace(); |
| } |
| } |
| if(Printer.trace)Printer.trace("<< JSSecurityManager: loadPropertiesImpl() completed"); |
| } |
| |
| /** Create a Thread in the current ThreadGroup. |
| */ |
| static Thread createThread(final Runnable runnable, |
| final String threadName, |
| final boolean isDaemon, final int priority, |
| final boolean doStart) |
| { |
| String name = (threadName != null) ? threadName : "JSSM Thread"; |
| Thread thread = new Thread(null, runnable, threadName, 0, false); |
| |
| thread.setDaemon(isDaemon); |
| if (priority >= 0) { |
| thread.setPriority(priority); |
| } |
| if (doStart) { |
| thread.start(); |
| } |
| return thread; |
| } |
| |
| static synchronized <T> List<T> getProviders(final Class<T> providerClass) { |
| List<T> p = new ArrayList<>(7); |
| // ServiceLoader creates "lazy" iterator instance, but it ensures that |
| // next/hasNext run with permissions that are restricted by whatever |
| // creates the ServiceLoader instance, so it requires to be called from |
| // privileged section |
| final PrivilegedAction<Iterator<T>> psAction = |
| new PrivilegedAction<Iterator<T>>() { |
| @Override |
| public Iterator<T> run() { |
| return ServiceLoader.load(providerClass).iterator(); |
| } |
| }; |
| final Iterator<T> ps = AccessController.doPrivileged(psAction); |
| |
| // the iterator's hasNext() method looks through classpath for |
| // the provider class names, so it requires read permissions |
| PrivilegedAction<Boolean> hasNextAction = new PrivilegedAction<Boolean>() { |
| public Boolean run() { |
| return ps.hasNext(); |
| } |
| }; |
| |
| while (AccessController.doPrivileged(hasNextAction)) { |
| try { |
| // the iterator's next() method creates instances of the |
| // providers and it should be called in the current security |
| // context |
| T provider = ps.next(); |
| if (providerClass.isInstance(provider)) { |
| // $$mp 2003-08-22 |
| // Always adding at the beginning reverses the |
| // order of the providers. So we no longer have |
| // to do this in AudioSystem and MidiSystem. |
| p.add(0, provider); |
| } |
| } catch (Throwable t) { |
| //$$fb 2002-11-07: do not fail on SPI not found |
| if (Printer.err) t.printStackTrace(); |
| } |
| } |
| return p; |
| } |
| } |