author | mchung |
Thu, 04 Oct 2018 08:45:21 -0700 | |
changeset 52015 | 821bfc24d750 |
parent 50113 | caf115bb98ad |
child 52334 | a181612f0715 |
permissions | -rw-r--r-- |
50113 | 1 |
/* |
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* Copyright (c) 2016, 2018, 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 jdk.jfr.internal; |
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import java.io.File; |
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import java.io.FileNotFoundException; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.io.RandomAccessFile; |
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import java.io.Reader; |
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52015
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
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import java.lang.invoke.MethodHandles; |
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import java.lang.reflect.Constructor; |
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import java.lang.reflect.Field; |
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import java.lang.reflect.Method; |
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import java.lang.reflect.ReflectPermission; |
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import java.nio.channels.FileChannel; |
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import java.nio.channels.ReadableByteChannel; |
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import java.nio.file.FileVisitResult; |
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import java.nio.file.Files; |
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import java.nio.file.Path; |
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import java.nio.file.Paths; |
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import java.nio.file.SimpleFileVisitor; |
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import java.nio.file.StandardOpenOption; |
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import java.nio.file.attribute.BasicFileAttributes; |
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import java.security.AccessControlContext; |
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import java.security.AccessController; |
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import java.security.Permission; |
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import java.security.PrivilegedAction; |
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import java.security.PrivilegedActionException; |
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import java.security.PrivilegedExceptionAction; |
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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.Objects; |
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import java.util.PropertyPermission; |
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import java.util.concurrent.Callable; |
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import jdk.internal.misc.Unsafe; |
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import jdk.internal.module.Modules; |
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import jdk.jfr.Event; |
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import jdk.jfr.FlightRecorder; |
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import jdk.jfr.FlightRecorderListener; |
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import jdk.jfr.FlightRecorderPermission; |
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import jdk.jfr.Recording; |
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/** |
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* Contains JFR code that does |
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* {@link AccessController#doPrivileged(PrivilegedAction)} |
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*/ |
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public final class SecuritySupport { |
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private final static Unsafe unsafe = Unsafe.getUnsafe(); |
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52015
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
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50113
diff
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private final static MethodHandles.Lookup LOOKUP = MethodHandles.lookup(); |
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private final static Module JFR_MODULE = Event.class.getModule(); |
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public final static SafePath JFC_DIRECTORY = getPathInProperty("java.home", "lib/jfr"); |
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static final SafePath USER_HOME = getPathInProperty("user.home", null); |
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static final SafePath JAVA_IO_TMPDIR = getPathInProperty("java.io.tmpdir", null); |
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final static class SecureRecorderListener implements FlightRecorderListener { |
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private final AccessControlContext context; |
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private final FlightRecorderListener changeListener; |
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SecureRecorderListener(AccessControlContext context, FlightRecorderListener changeListener) { |
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this.context = Objects.requireNonNull(context); |
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this.changeListener = Objects.requireNonNull(changeListener); |
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} |
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@Override |
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public void recordingStateChanged(Recording recording) { |
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AccessController.doPrivileged((PrivilegedAction<Void>) () -> { |
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try { |
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changeListener.recordingStateChanged(recording); |
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} catch (Throwable t) { |
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// Prevent malicious user to propagate exception callback in the wrong context |
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Logger.log(LogTag.JFR, LogLevel.WARN, "Unexpected exception in listener " + changeListener.getClass()+ " at recording state change"); |
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} |
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return null; |
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}, context); |
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} |
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@Override |
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public void recorderInitialized(FlightRecorder recorder) { |
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AccessController.doPrivileged((PrivilegedAction<Void>) () -> { |
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try { |
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changeListener.recorderInitialized(recorder); |
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} catch (Throwable t) { |
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// Prevent malicious user to propagate exception callback in the wrong context |
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Logger.log(LogTag.JFR, LogLevel.WARN, "Unexpected exception in listener " + changeListener.getClass()+ " when initializing FlightRecorder"); |
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} |
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return null; |
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}, context); |
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} |
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public FlightRecorderListener getChangeListener() { |
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return changeListener; |
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} |
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} |
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private static final class DirectoryCleaner extends SimpleFileVisitor<Path> { |
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@Override |
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public FileVisitResult visitFile(Path path, BasicFileAttributes attrs) throws IOException { |
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Files.delete(path); |
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return FileVisitResult.CONTINUE; |
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} |
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@Override |
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public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException { |
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if (exc != null) { |
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throw exc; |
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} |
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Files.delete(dir); |
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return FileVisitResult.CONTINUE; |
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} |
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} |
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/** |
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* Path created by the default file provider,and not |
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* a malicious provider. |
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* |
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*/ |
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public static final class SafePath { |
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private final Path path; |
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private final String text; |
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public SafePath(Path p) { |
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// sanitize |
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text = p.toString(); |
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path = Paths.get(text); |
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} |
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public SafePath(String path) { |
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this(Paths.get(path)); |
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} |
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public Path toPath() { |
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return path; |
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} |
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public String toString() { |
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return text; |
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} |
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} |
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private interface RunnableWithCheckedException { |
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public void run() throws Exception; |
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} |
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private interface CallableWithoutCheckException<T> { |
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public T call(); |
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} |
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private static <U> U doPrivilegedIOWithReturn(Callable<U> function) throws IOException { |
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try { |
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return AccessController.doPrivileged(new PrivilegedExceptionAction<U>() { |
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@Override |
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public U run() throws Exception { |
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return function.call(); |
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} |
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}, null); |
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} catch (PrivilegedActionException e) { |
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Throwable t = e.getCause(); |
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if (t instanceof IOException) { |
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throw (IOException) t; |
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} |
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throw new IOException("Unexpected error during I/O operation. " + t.getMessage(), t); |
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} |
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} |
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private static void doPriviligedIO(RunnableWithCheckedException function) throws IOException { |
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doPrivilegedIOWithReturn(() -> { |
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function.run(); |
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return null; |
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}); |
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} |
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private static void doPrivileged(Runnable function, Permission... perms) { |
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AccessController.doPrivileged(new PrivilegedAction<Void>() { |
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@Override |
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public Void run() { |
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function.run(); |
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return null; |
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} |
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}, null, perms); |
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} |
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private static void doPrivileged(Runnable function) { |
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AccessController.doPrivileged(new PrivilegedAction<Void>() { |
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@Override |
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public Void run() { |
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function.run(); |
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return null; |
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} |
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}); |
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} |
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private static <T> T doPrivilegedWithReturn(CallableWithoutCheckException<T> function, Permission... perms) { |
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return AccessController.doPrivileged(new PrivilegedAction<T>() { |
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@Override |
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public T run() { |
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return function.call(); |
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} |
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}, null, perms); |
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} |
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public static List<SafePath> getPredefinedJFCFiles() { |
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List<SafePath> list = new ArrayList<>(); |
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try { |
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Iterator<Path> pathIterator = doPrivilegedIOWithReturn(() -> { |
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return Files.newDirectoryStream(JFC_DIRECTORY.toPath(), "*").iterator(); |
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}); |
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while (pathIterator.hasNext()) { |
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Path path = pathIterator.next(); |
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if (path.toString().endsWith(".jfc")) { |
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list.add(new SafePath(path)); |
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} |
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} |
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} catch (IOException ioe) { |
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Logger.log(LogTag.JFR, LogLevel.WARN, "Could not access .jfc-files in " + JFC_DIRECTORY + ", " + ioe.getMessage()); |
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} |
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return list; |
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} |
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static void makeVisibleToJFR(Class<?> clazz) { |
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Module classModule = clazz.getModule(); |
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Modules.addReads(JFR_MODULE, classModule); |
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if (clazz.getPackage() != null) { |
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String packageName = clazz.getPackage().getName(); |
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Modules.addExports(classModule, packageName, JFR_MODULE); |
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Modules.addOpens(classModule, packageName, JFR_MODULE); |
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} |
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} |
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/** |
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* Adds a qualified export of the internal.jdk.jfr.internal.handlers package |
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* (for EventHandler) |
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*/ |
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static void addHandlerExport(Class<?> clazz) { |
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Modules.addExports(JFR_MODULE, Utils.HANDLERS_PACKAGE_NAME, clazz.getModule()); |
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} |
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public static void registerEvent(Class<? extends Event> eventClass) { |
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doPrivileged(() -> FlightRecorder.register(eventClass), new FlightRecorderPermission(Utils.REGISTER_EVENT)); |
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} |
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static boolean getBooleanProperty(String propertyName) { |
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return doPrivilegedWithReturn(() -> Boolean.getBoolean(propertyName), new PropertyPermission(propertyName, "read")); |
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} |
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private static SafePath getPathInProperty(String prop, String subPath) { |
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return doPrivilegedWithReturn(() -> { |
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String path = System.getProperty(prop); |
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if (path == null) { |
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return null; |
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} |
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File file = subPath == null ? new File(path) : new File(path, subPath); |
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return new SafePath(file.getAbsolutePath()); |
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}, new PropertyPermission("*", "read")); |
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} |
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// Called by JVM during initialization of JFR |
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static Thread createRecorderThread(ThreadGroup systemThreadGroup, ClassLoader contextClassLoader) { |
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// The thread should have permission = new Permission[0], and not "modifyThreadGroup" and "modifyThread" on the stack, |
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// but it's hard circumvent if we are going to pass in system thread group in the constructor |
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Thread thread = doPrivilegedWithReturn(() -> new Thread(systemThreadGroup, "JFR Recorder Thread"), new RuntimePermission("modifyThreadGroup"), new RuntimePermission("modifyThread")); |
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doPrivileged(() -> thread.setContextClassLoader(contextClassLoader), new RuntimePermission("setContextClassLoader"), new RuntimePermission("modifyThread")); |
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return thread; |
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} |
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||
293 |
static void registerShutdownHook(Thread shutdownHook) { |
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doPrivileged(() -> Runtime.getRuntime().addShutdownHook(shutdownHook), new RuntimePermission("shutdownHooks")); |
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} |
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296 |
||
297 |
static void setUncaughtExceptionHandler(Thread thread, Thread.UncaughtExceptionHandler eh) { |
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doPrivileged(() -> thread.setUncaughtExceptionHandler(eh), new RuntimePermission("modifyThread")); |
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} |
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300 |
||
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static void moveReplace(SafePath from, SafePath to) throws IOException { |
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doPrivilegedIOWithReturn(() -> Files.move(from.toPath(), to.toPath())); |
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} |
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304 |
||
305 |
static void clearDirectory(SafePath safePath) throws IOException { |
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306 |
doPriviligedIO(() -> Files.walkFileTree(safePath.toPath(), new DirectoryCleaner())); |
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} |
|
308 |
||
309 |
static SafePath toRealPath(SafePath safePath) throws Exception { |
|
310 |
return new SafePath(doPrivilegedIOWithReturn(() -> safePath.toPath().toRealPath())); |
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311 |
} |
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312 |
||
313 |
static boolean existDirectory(SafePath directory) throws IOException { |
|
314 |
return doPrivilegedIOWithReturn(() -> Files.exists(directory.toPath())); |
|
315 |
} |
|
316 |
||
317 |
static RandomAccessFile createRandomAccessFile(SafePath path) throws Exception { |
|
318 |
return doPrivilegedIOWithReturn(() -> new RandomAccessFile(path.toPath().toFile(), "rw")); |
|
319 |
} |
|
320 |
||
321 |
public static InputStream newFileInputStream(SafePath safePath) throws IOException { |
|
322 |
return doPrivilegedIOWithReturn(() -> Files.newInputStream(safePath.toPath())); |
|
323 |
} |
|
324 |
||
325 |
public static long getFileSize(SafePath safePath) throws IOException { |
|
326 |
return doPrivilegedIOWithReturn(() -> Files.size(safePath.toPath())); |
|
327 |
} |
|
328 |
||
329 |
static SafePath createDirectories(SafePath safePath) throws IOException { |
|
330 |
Path p = doPrivilegedIOWithReturn(() -> Files.createDirectories(safePath.toPath())); |
|
331 |
return new SafePath(p); |
|
332 |
} |
|
333 |
||
334 |
public static boolean exists(SafePath safePath) throws IOException { |
|
335 |
return doPrivilegedIOWithReturn(() -> Files.exists(safePath.toPath())); |
|
336 |
} |
|
337 |
||
338 |
public static boolean isDirectory(SafePath safePath) throws IOException { |
|
339 |
return doPrivilegedIOWithReturn(() -> Files.isDirectory(safePath.toPath())); |
|
340 |
} |
|
341 |
||
342 |
static void delete(SafePath localPath) throws IOException { |
|
343 |
doPriviligedIO(() -> Files.delete(localPath.toPath())); |
|
344 |
} |
|
345 |
||
346 |
static boolean isWritable(SafePath safePath) throws IOException { |
|
347 |
return doPrivilegedIOWithReturn(() -> Files.isWritable(safePath.toPath())); |
|
348 |
} |
|
349 |
||
350 |
static void deleteOnExit(SafePath safePath) { |
|
351 |
doPrivileged(() -> safePath.toPath().toFile().deleteOnExit()); |
|
352 |
} |
|
353 |
||
354 |
static ReadableByteChannel newFileChannelToRead(SafePath safePath) throws IOException { |
|
355 |
return doPrivilegedIOWithReturn(() -> FileChannel.open(safePath.toPath(), StandardOpenOption.READ)); |
|
356 |
} |
|
357 |
||
358 |
public static InputStream getResourceAsStream(String name) throws IOException { |
|
359 |
return doPrivilegedIOWithReturn(() -> SecuritySupport.class.getResourceAsStream(name)); |
|
360 |
} |
|
361 |
||
362 |
public static Reader newFileReader(SafePath safePath) throws FileNotFoundException, IOException { |
|
363 |
return doPrivilegedIOWithReturn(() -> Files.newBufferedReader(safePath.toPath())); |
|
364 |
} |
|
365 |
||
366 |
static void touch(SafePath path) throws IOException { |
|
367 |
doPriviligedIO(() -> new RandomAccessFile(path.toPath().toFile(), "rw").close()); |
|
368 |
} |
|
369 |
||
370 |
static void setAccessible(Method method) { |
|
371 |
doPrivileged(() -> method.setAccessible(true), new ReflectPermission("suppressAccessChecks")); |
|
372 |
} |
|
373 |
||
374 |
static void setAccessible(Field field) { |
|
375 |
doPrivileged(() -> field.setAccessible(true), new ReflectPermission("suppressAccessChecks")); |
|
376 |
} |
|
377 |
||
378 |
static void setAccessible(Constructor<?> constructor) { |
|
379 |
doPrivileged(() -> constructor.setAccessible(true), new ReflectPermission("suppressAccessChecks")); |
|
380 |
} |
|
381 |
||
382 |
static void ensureClassIsInitialized(Class<?> clazz) { |
|
383 |
unsafe.ensureClassInitialized(clazz); |
|
384 |
} |
|
385 |
||
52015
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
|
386 |
static Class<?> defineClass(Class<?> lookupClass, byte[] bytes) { |
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
|
387 |
return AccessController.doPrivileged(new PrivilegedAction<>() { |
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
|
388 |
@Override |
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
|
389 |
public Class<?> run() { |
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
|
390 |
try { |
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
|
391 |
return MethodHandles.privateLookupIn(lookupClass, LOOKUP).defineClass(bytes); |
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
|
392 |
} catch (IllegalAccessException e) { |
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
|
393 |
throw new InternalError(e); |
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
|
394 |
} |
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
|
395 |
} |
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
|
396 |
}); |
50113 | 397 |
} |
398 |
||
399 |
static Thread createThreadWitNoPermissions(String threadName, Runnable runnable) { |
|
400 |
return doPrivilegedWithReturn(() -> new Thread(runnable, threadName), new Permission[0]); |
|
401 |
} |
|
402 |
||
403 |
static void setDaemonThread(Thread t, boolean daeomn) { |
|
404 |
doPrivileged(()-> t.setDaemon(daeomn), new RuntimePermission("modifyThread")); |
|
405 |
} |
|
406 |
||
407 |
public static SafePath getAbsolutePath(SafePath path) throws IOException { |
|
408 |
return new SafePath(doPrivilegedIOWithReturn((()-> path.toPath().toAbsolutePath()))); |
|
409 |
} |
|
410 |
} |