package jdk.jfr.internal;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.io.Reader;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.ReflectPermission;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.StandardOpenOption;
import java.nio.file.attribute.BasicFileAttributes;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.Permission;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.PropertyPermission;
import java.util.concurrent.Callable;
import jdk.internal.misc.Unsafe;
import jdk.internal.module.Modules;
import jdk.jfr.Event;
import jdk.jfr.FlightRecorder;
import jdk.jfr.FlightRecorderListener;
import jdk.jfr.FlightRecorderPermission;
import jdk.jfr.Recording;
public final class SecuritySupport {
private final static Unsafe unsafe = Unsafe.getUnsafe();
private final static MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
private final static Module JFR_MODULE = Event.class.getModule();
public final static SafePath JFC_DIRECTORY = getPathInProperty("java.home", "lib/jfr");
static final SafePath USER_HOME = getPathInProperty("user.home", null);
static final SafePath JAVA_IO_TMPDIR = getPathInProperty("java.io.tmpdir", null);
static {
addReadEdge(Object.class);
addHandlerExport(Object.class);
addEventsExport(Object.class);
addInstrumentExport(Object.class);
}
final static class SecureRecorderListener implements FlightRecorderListener {
private final AccessControlContext context;
private final FlightRecorderListener changeListener;
SecureRecorderListener(AccessControlContext context, FlightRecorderListener changeListener) {
this.context = Objects.requireNonNull(context);
this.changeListener = Objects.requireNonNull(changeListener);
}
@Override
public void recordingStateChanged(Recording recording) {
AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
try {
changeListener.recordingStateChanged(recording);
} catch (Throwable t) {
Logger.log(LogTag.JFR, LogLevel.WARN, "Unexpected exception in listener " + changeListener.getClass()+ " at recording state change");
}
return null;
}, context);
}
@Override
public void recorderInitialized(FlightRecorder recorder) {
AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
try {
changeListener.recorderInitialized(recorder);
} catch (Throwable t) {
Logger.log(LogTag.JFR, LogLevel.WARN, "Unexpected exception in listener " + changeListener.getClass()+ " when initializing FlightRecorder");
}
return null;
}, context);
}
public FlightRecorderListener getChangeListener() {
return changeListener;
}
}
private static final class DirectoryCleaner extends SimpleFileVisitor<Path> {
@Override
public FileVisitResult visitFile(Path path, BasicFileAttributes attrs) throws IOException {
Files.delete(path);
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
if (exc != null) {
throw exc;
}
Files.delete(dir);
return FileVisitResult.CONTINUE;
}
}
public static final class SafePath {
private final Path path;
private final String text;
public SafePath(Path p) {
text = p.toString();
path = Paths.get(text);
}
public SafePath(String path) {
this(Paths.get(path));
}
public Path toPath() {
return path;
}
public String toString() {
return text;
}
}
private interface RunnableWithCheckedException {
public void run() throws Exception;
}
private interface CallableWithoutCheckException<T> {
public T call();
}
private static <U> U doPrivilegedIOWithReturn(Callable<U> function) throws IOException {
try {
return AccessController.doPrivileged(new PrivilegedExceptionAction<U>() {
@Override
public U run() throws Exception {
return function.call();
}
}, null);
} catch (PrivilegedActionException e) {
Throwable t = e.getCause();
if (t instanceof IOException) {
throw (IOException) t;
}
throw new IOException("Unexpected error during I/O operation. " + t.getMessage(), t);
}
}
private static void doPriviligedIO(RunnableWithCheckedException function) throws IOException {
doPrivilegedIOWithReturn(() -> {
function.run();
return null;
});
}
private static void doPrivileged(Runnable function, Permission... perms) {
AccessController.doPrivileged(new PrivilegedAction<Void>() {
@Override
public Void run() {
function.run();
return null;
}
}, null, perms);
}
private static void doPrivileged(Runnable function) {
AccessController.doPrivileged(new PrivilegedAction<Void>() {
@Override
public Void run() {
function.run();
return null;
}
});
}
private static <T> T doPrivilegedWithReturn(CallableWithoutCheckException<T> function, Permission... perms) {
return AccessController.doPrivileged(new PrivilegedAction<T>() {
@Override
public T run() {
return function.call();
}
}, null, perms);
}
public static List<SafePath> getPredefinedJFCFiles() {
List<SafePath> list = new ArrayList<>();
try {
Iterator<Path> pathIterator = doPrivilegedIOWithReturn(() -> {
return Files.newDirectoryStream(JFC_DIRECTORY.toPath(), "*").iterator();
});
while (pathIterator.hasNext()) {
Path path = pathIterator.next();
if (path.toString().endsWith(".jfc")) {
list.add(new SafePath(path));
}
}
} catch (IOException ioe) {
Logger.log(LogTag.JFR, LogLevel.WARN, "Could not access .jfc-files in " + JFC_DIRECTORY + ", " + ioe.getMessage());
}
return list;
}
static void makeVisibleToJFR(Class<?> clazz) {
Module classModule = clazz.getModule();
Modules.addReads(JFR_MODULE, classModule);
if (clazz.getPackage() != null) {
String packageName = clazz.getPackage().getName();
Modules.addExports(classModule, packageName, JFR_MODULE);
Modules.addOpens(classModule, packageName, JFR_MODULE);
}
}
static void addHandlerExport(Class<?> clazz) {
Modules.addExports(JFR_MODULE, Utils.HANDLERS_PACKAGE_NAME, clazz.getModule());
}
static void addEventsExport(Class<?> clazz) {
Modules.addExports(JFR_MODULE, Utils.EVENTS_PACKAGE_NAME, clazz.getModule());
}
static void addInstrumentExport(Class<?> clazz) {
Modules.addExports(JFR_MODULE, Utils.INSTRUMENT_PACKAGE_NAME, clazz.getModule());
}
static void addReadEdge(Class<?> clazz) {
Modules.addReads(clazz.getModule(), JFR_MODULE);
}
public static void registerEvent(Class<? extends jdk.internal.event.Event> eventClass) {
doPrivileged(() -> MetadataRepository.getInstance().register(eventClass), new FlightRecorderPermission(Utils.REGISTER_EVENT));
}
public static void registerMirror(Class<? extends Event> eventClass) {
doPrivileged(() -> MetadataRepository.getInstance().registerMirror(eventClass), new FlightRecorderPermission(Utils.REGISTER_EVENT));
}
static boolean getBooleanProperty(String propertyName) {
return doPrivilegedWithReturn(() -> Boolean.getBoolean(propertyName), new PropertyPermission(propertyName, "read"));
}
private static SafePath getPathInProperty(String prop, String subPath) {
return doPrivilegedWithReturn(() -> {
String path = System.getProperty(prop);
if (path == null) {
return null;
}
File file = subPath == null ? new File(path) : new File(path, subPath);
return new SafePath(file.getAbsolutePath());
}, new PropertyPermission("*", "read"));
}
static Thread createRecorderThread(ThreadGroup systemThreadGroup, ClassLoader contextClassLoader) {
Thread thread = doPrivilegedWithReturn(() -> new Thread(systemThreadGroup, "JFR Recorder Thread"), new RuntimePermission("modifyThreadGroup"), new RuntimePermission("modifyThread"));
doPrivileged(() -> thread.setContextClassLoader(contextClassLoader), new RuntimePermission("setContextClassLoader"), new RuntimePermission("modifyThread"));
return thread;
}
static void registerShutdownHook(Thread shutdownHook) {
doPrivileged(() -> Runtime.getRuntime().addShutdownHook(shutdownHook), new RuntimePermission("shutdownHooks"));
}
static void setUncaughtExceptionHandler(Thread thread, Thread.UncaughtExceptionHandler eh) {
doPrivileged(() -> thread.setUncaughtExceptionHandler(eh), new RuntimePermission("modifyThread"));
}
static void moveReplace(SafePath from, SafePath to) throws IOException {
doPrivilegedIOWithReturn(() -> Files.move(from.toPath(), to.toPath()));
}
static void clearDirectory(SafePath safePath) throws IOException {
doPriviligedIO(() -> Files.walkFileTree(safePath.toPath(), new DirectoryCleaner()));
}
static SafePath toRealPath(SafePath safePath) throws Exception {
return new SafePath(doPrivilegedIOWithReturn(() -> safePath.toPath().toRealPath()));
}
static boolean existDirectory(SafePath directory) throws IOException {
return doPrivilegedIOWithReturn(() -> Files.exists(directory.toPath()));
}
static RandomAccessFile createRandomAccessFile(SafePath path) throws Exception {
return doPrivilegedIOWithReturn(() -> new RandomAccessFile(path.toPath().toFile(), "rw"));
}
public static InputStream newFileInputStream(SafePath safePath) throws IOException {
return doPrivilegedIOWithReturn(() -> Files.newInputStream(safePath.toPath()));
}
public static long getFileSize(SafePath safePath) throws IOException {
return doPrivilegedIOWithReturn(() -> Files.size(safePath.toPath()));
}
static SafePath createDirectories(SafePath safePath) throws IOException {
Path p = doPrivilegedIOWithReturn(() -> Files.createDirectories(safePath.toPath()));
return new SafePath(p);
}
public static boolean exists(SafePath safePath) throws IOException {
return doPrivilegedIOWithReturn(() -> Files.exists(safePath.toPath()));
}
public static boolean isDirectory(SafePath safePath) throws IOException {
return doPrivilegedIOWithReturn(() -> Files.isDirectory(safePath.toPath()));
}
static void delete(SafePath localPath) throws IOException {
doPriviligedIO(() -> Files.delete(localPath.toPath()));
}
static boolean isWritable(SafePath safePath) throws IOException {
return doPrivilegedIOWithReturn(() -> Files.isWritable(safePath.toPath()));
}
static void deleteOnExit(SafePath safePath) {
doPrivileged(() -> safePath.toPath().toFile().deleteOnExit());
}
static ReadableByteChannel newFileChannelToRead(SafePath safePath) throws IOException {
return doPrivilegedIOWithReturn(() -> FileChannel.open(safePath.toPath(), StandardOpenOption.READ));
}
public static InputStream getResourceAsStream(String name) throws IOException {
return doPrivilegedIOWithReturn(() -> SecuritySupport.class.getResourceAsStream(name));
}
public static Reader newFileReader(SafePath safePath) throws FileNotFoundException, IOException {
return doPrivilegedIOWithReturn(() -> Files.newBufferedReader(safePath.toPath()));
}
static void touch(SafePath path) throws IOException {
doPriviligedIO(() -> new RandomAccessFile(path.toPath().toFile(), "rw").close());
}
static void setAccessible(Method method) {
doPrivileged(() -> method.setAccessible(true), new ReflectPermission("suppressAccessChecks"));
}
static void setAccessible(Field field) {
doPrivileged(() -> field.setAccessible(true), new ReflectPermission("suppressAccessChecks"));
}
static void setAccessible(Constructor<?> constructor) {
doPrivileged(() -> constructor.setAccessible(true), new ReflectPermission("suppressAccessChecks"));
}
static void ensureClassIsInitialized(Class<?> clazz) {
unsafe.ensureClassInitialized(clazz);
}
static Class<?> defineClass(Class<?> lookupClass, byte[] bytes) {
return AccessController.doPrivileged(new PrivilegedAction<>() {
@Override
public Class<?> run() {
try {
return MethodHandles.privateLookupIn(lookupClass, LOOKUP).defineClass(bytes);
} catch (IllegalAccessException e) {
throw new InternalError(e);
}
}
});
}
static Thread createThreadWitNoPermissions(String threadName, Runnable runnable) {
return doPrivilegedWithReturn(() -> new Thread(runnable, threadName), new Permission[0]);
}
static void setDaemonThread(Thread t, boolean daeomn) {
doPrivileged(()-> t.setDaemon(daeomn), new RuntimePermission("modifyThread"));
}
public static SafePath getAbsolutePath(SafePath path) throws IOException {
return new SafePath(doPrivilegedIOWithReturn((()-> path.toPath().toAbsolutePath())));
}
}
SecuritySupport
unsafe: Unsafe
USER_HOME: SafePath
