/*
* Copyright (c) 2016, 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 jdk.jfr;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import jdk.jfr.internal.PlatformEventType;
import jdk.jfr.internal.PlatformRecorder;
import jdk.jfr.internal.PlatformRecording;
import jdk.jfr.internal.PrivateAccess;
import jdk.jfr.internal.Type;
import jdk.jfr.internal.Utils;
/**
* Permission for controlling access to Flight Recorder.
* <p>
* The following table provides a summary of what the permission
* allows, and the risks of granting code the permission.
*
* <table class="striped">
* <caption style="display:none">Table shows permission target name,
* what the permission allows, and associated risks</caption>
* <thead>
* <tr>
* <th scope="col">Permission Target Name</th>
* <th scope="col">What the Permission Allows</th>
* <th scope="col">Risks of Allowing this Permission</th>
* </tr>
* </thead>
*
* <tbody>
* <tr>
* <th scope="row">{@code accessFlightRecorder}</th>
* <td>Ability to create a Flight Recorder instance, register callbacks to
* monitor the Flight Recorder life cycle, and control an existing instance
* of Flight Recorder, which can record and dump runtime information, such as
* stack traces, class names, and data in user defined events.</td>
* <td>A malicious user may be able to extract sensitive information that is stored in
* events and interrupt Flight Recorder by installing listeners or hooks that
* never finish.</td>
* </tr>
* <tr>
* <th scope="row">{@code registerEvent}</th>
* <td>Ability to register events, write data to the Flight Recorder buffers,
* and execute code in a callback function for periodic events.
*
* <td>A malicious user may be able to write sensitive information to Flight
* Recorder buffers.</td>
* </tr>
* </tbody>
* </table>
*
* <p>
* Typically, programmers do not create {@code FlightRecorderPermission} objects
* directly. Instead the objects are created by the security policy code that is based on
* reading the security policy file.
*
* @since 9
*
* @see java.security.BasicPermission
* @see java.security.Permission
* @see java.security.Permissions
* @see java.security.PermissionCollection
* @see java.lang.SecurityManager
*
*/
@SuppressWarnings("serial")
public final class FlightRecorderPermission extends java.security.BasicPermission {
// Purpose of InternalAccess is to give classes in jdk.jfr.internal
// access to package private methods in this package (jdk.jfr).
//
// The initialization could be done in any class in this package,
// but this one was chosen because it is light weight and
// lacks dependencies on other public classes.
static {
PrivateAccess.setPrivateAccess(new InternalAccess());
}
private final static class InternalAccess extends PrivateAccess {
@Override
public Type getType(Object o) {
if (o instanceof AnnotationElement) {
return ((AnnotationElement) o).getType();
}
if (o instanceof EventType) {
return ((EventType) o).getType();
}
if (o instanceof ValueDescriptor) {
return ((ValueDescriptor) o).getType();
}
if (o instanceof SettingDescriptor) {
return ((SettingDescriptor) o).getType();
}
throw new Error("Unknown type " + o.getClass());
}
@Override
public Configuration newConfiguration(String name, String label, String description, String provider, Map<String, String> settings, String contents) {
return new Configuration(name, label, description, provider, settings, contents);
}
@Override
public EventType newEventType(PlatformEventType platformEventType) {
return new EventType(platformEventType);
}
@Override
public AnnotationElement newAnnotation(Type annotationType, List<Object> values, boolean boot) {
return new AnnotationElement(annotationType, values, boot);
}
@Override
public ValueDescriptor newValueDescriptor(String name, Type fieldType, List<AnnotationElement> annos, int dimension, boolean constantPool, String fieldName) {
return new ValueDescriptor(fieldType, name, annos, dimension, constantPool, fieldName);
}
@Override
public PlatformRecording getPlatformRecording(Recording r) {
return r.getInternal();
}
@Override
public PlatformEventType getPlatformEventType(EventType eventType) {
return eventType.getPlatformEventType();
}
@Override
public boolean isConstantPool(ValueDescriptor v) {
return v.isConstantPool();
}
@Override
public void setAnnotations(ValueDescriptor v, List<AnnotationElement> a) {
v.setAnnotations(a);
}
@Override
public void setAnnotations(SettingDescriptor s, List<AnnotationElement> a) {
s.setAnnotations(a);
}
@Override
public String getFieldName(ValueDescriptor v) {
return v.getJavaFieldName();
}
@Override
public ValueDescriptor newValueDescriptor(Class<?> type, String name) {
return new ValueDescriptor(type, name, Collections.emptyList(), true);
}
@Override
public SettingDescriptor newSettingDescriptor(Type type, String name, String defaultValue, List<AnnotationElement> annotations) {
return new SettingDescriptor(type, name, defaultValue, annotations);
}
@Override
public boolean isUnsigned(ValueDescriptor v) {
return v.isUnsigned();
}
/**代码未完, 请加载全部代码(NowJava.com).**/