com.sun.xml.ws.policy.util.MethodUtil Maven / Gradle / Ivy
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/*
* Copyright (c) 2017, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package com.sun.xml.ws.policy.util;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.security.AccessController;
import java.security.AllPermission;
import java.security.CodeSource;
import java.security.PermissionCollection;
import java.security.PrivilegedExceptionAction;
import java.security.SecureClassLoader;
import java.util.Arrays;
/*
* This copies from sun.reflect.misc.MethodUtil to implement the trampoline
* code such that when a Method is invoked, it will be called through
* the trampoline that is defined by this MethodUtil class loader.
*/
class Trampoline {
static {
if (Trampoline.class.getClassLoader() == null) {
throw new Error(
"Trampoline must not be defined by the bootstrap classloader");
}
}
private static void ensureInvocableMethod(Method m)
throws InvocationTargetException {
Class clazz = m.getDeclaringClass();
if (clazz.equals(AccessController.class) ||
clazz.equals(Method.class) ||
clazz.getName().startsWith("java.lang.invoke."))
throw new InvocationTargetException(
new UnsupportedOperationException("invocation not supported"));
}
private static Object invoke(Method m, Object obj, Object[] params)
throws InvocationTargetException, IllegalAccessException {
ensureInvocableMethod(m);
return m.invoke(obj, params);
}
}
/*
* Create a trampoline class.
*/
public final class MethodUtil extends SecureClassLoader {
private static final String WS_UTIL_POLICY_PKG = "com.sun.xml.ws.policy.util.";
private static final String TRAMPOLINE = WS_UTIL_POLICY_PKG + "Trampoline";
private static final Method bounce = getTrampoline();
private static final int DEFAULT_BUFFER_SIZE = 8192;
private static final int MAX_BUFFER_SIZE = Integer.MAX_VALUE - 8;
private MethodUtil() {
super();
}
/*
* Bounce through the trampoline.
*/
public static Object invoke(Method m, Object obj, Object[] params)
throws InvocationTargetException, IllegalAccessException {
try {
return bounce.invoke(null, m, obj, params);
} catch (InvocationTargetException ie) {
Throwable t = ie.getCause();
if (t instanceof InvocationTargetException) {
throw (InvocationTargetException) t;
} else if (t instanceof IllegalAccessException) {
throw (IllegalAccessException) t;
} else if (t instanceof RuntimeException) {
throw (RuntimeException) t;
} else if (t instanceof Error) {
throw (Error) t;
} else {
throw new Error("Unexpected invocation error", t);
}
} catch (IllegalAccessException iae) {
// this can't happen
throw new Error("Unexpected invocation error", iae);
}
}
private static Method getTrampoline() {
try {
return AccessController.doPrivileged(
new PrivilegedExceptionAction() {
public Method run() throws Exception {
Class t = getTrampolineClass();
Method b = t.getDeclaredMethod("invoke",
Method.class, Object.class, Object[].class);
b.setAccessible(true);
return b;
}
});
} catch (Exception e) {
throw new InternalError("bouncer cannot be found", e);
}
}
protected synchronized Class loadClass(String name, boolean resolve)
throws ClassNotFoundException {
// First, check if the class has already been loaded
checkPackageAccess(name);
Class c = findLoadedClass(name);
if (c == null) {
try {
c = findClass(name);
} catch (ClassNotFoundException e) {
// Fall through ...
}
if (c == null) {
c = getParent().loadClass(name);
}
}
if (resolve) {
resolveClass(c);
}
return c;
}
protected Class findClass(final String name)
throws ClassNotFoundException {
if (!name.startsWith(WS_UTIL_POLICY_PKG)) {
throw new ClassNotFoundException(name);
}
String path = "/".concat(name.replace('.', '/').concat(".class"));
try (InputStream in = MethodUtil.class.getResourceAsStream(path)) {
byte[] b = readAllBytes(in);
return defineClass(name, b);
} catch (IOException e) {
throw new ClassNotFoundException(name, e);
}
}
/**
* JDK9 {@link InputStream#readAllBytes()} substitution.
*/
private byte[] readAllBytes(InputStream in) throws IOException {
byte[] buf = new byte[DEFAULT_BUFFER_SIZE];
int capacity = buf.length;
int nread = 0;
int n;
for (; ; ) {
// read to EOF which may read more or less than initial buffer size
while ((n = in.read(buf, nread, capacity - nread)) > 0)
nread += n;
// if the last call to read returned -1, then we're done
if (n < 0)
break;
// need to allocate a larger buffer
if (capacity <= MAX_BUFFER_SIZE - capacity) {
capacity = capacity << 1;
} else {
if (capacity == MAX_BUFFER_SIZE)
throw new OutOfMemoryError("Required array size too large");
capacity = MAX_BUFFER_SIZE;
}
buf = Arrays.copyOf(buf, capacity);
}
return (capacity == nread) ? buf : Arrays.copyOf(buf, nread);
}
/*
* Define the proxy classes
*/
private Class defineClass(String name, byte[] b) throws IOException {
CodeSource cs = new CodeSource(null, (java.security.cert.Certificate[]) null);
if (!name.equals(TRAMPOLINE)) {
throw new IOException("MethodUtil: bad name " + name);
}
return defineClass(name, b, 0, b.length, cs);
}
protected PermissionCollection getPermissions(CodeSource codesource) {
PermissionCollection perms = super.getPermissions(codesource);
perms.add(new AllPermission());
return perms;
}
private static Class getTrampolineClass() {
try {
return Class.forName(TRAMPOLINE, true, new MethodUtil());
} catch (ClassNotFoundException e) {
}
return null;
}
/**
* Checks package access on the given classname.
* This method is typically called when the Class instance is not
* available and the caller attempts to load a class on behalf
* the true caller (application).
*/
private static void checkPackageAccess(String name) {
SecurityManager s = System.getSecurityManager();
if (s != null) {
String cname = name.replace('/', '.');
if (cname.startsWith("[")) {
int b = cname.lastIndexOf('[') + 2;
if (b > 1 && b < cname.length()) {
cname = cname.substring(b);
}
}
int i = cname.lastIndexOf('.');
if (i != -1) {
s.checkPackageAccess(cname.substring(0, i));
}
}
}
/**
* Checks package access on the given class.
*
* If it is a {@link Proxy#isProxyClass(Class)} that implements
* a non-public interface (i.e. may be in a non-restricted package),
* also check the package access on the proxy interfaces.
*/
private static void checkPackageAccess(Class clazz) {
checkPackageAccess(clazz.getName());
if (isNonPublicProxyClass(clazz)) {
checkProxyPackageAccess(clazz);
}
}
// Note that bytecode instrumentation tools may exclude 'sun.*'
// classes but not generated proxy classes and so keep it in com.sun.*
private static final String PROXY_PACKAGE = "com.sun.proxy";
/**
* Test if the given class is a proxy class that implements
* non-public interface. Such proxy class may be in a non-restricted
* package that bypasses checkPackageAccess.
*/
private static boolean isNonPublicProxyClass(Class cls) {
String name = cls.getName();
int i = name.lastIndexOf('.');
String pkg = (i != -1) ? name.substring(0, i) : "";
return Proxy.isProxyClass(cls) && !pkg.startsWith(PROXY_PACKAGE);
}
/**
* Check package access on the proxy interfaces that the given proxy class
* implements.
*
* @param clazz Proxy class object
*/
private static void checkProxyPackageAccess(Class clazz) {
SecurityManager s = System.getSecurityManager();
if (s != null) {
// check proxy interfaces if the given class is a proxy class
if (Proxy.isProxyClass(clazz)) {
for (Class intf : clazz.getInterfaces()) {
checkPackageAccess(intf);
}
}
}
}
}