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1 /* |
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2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.xml.internal.ws.policy.util; |
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27 |
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28 import java.io.IOException; |
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29 import java.io.InputStream; |
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30 import java.lang.reflect.InvocationTargetException; |
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31 import java.lang.reflect.Method; |
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32 import java.lang.reflect.Proxy; |
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33 import java.security.AccessController; |
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34 import java.security.AllPermission; |
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35 import java.security.CodeSource; |
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36 import java.security.PermissionCollection; |
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37 import java.security.PrivilegedExceptionAction; |
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38 import java.security.SecureClassLoader; |
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39 import java.util.Arrays; |
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40 |
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41 /* |
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42 * This copies from sun.reflect.misc.MethodUtil to implement the trampoline |
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43 * code such that when a Method is invoked, it will be called through |
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44 * the trampoline that is defined by this MethodUtil class loader. |
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45 */ |
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46 class Trampoline { |
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47 static { |
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48 if (Trampoline.class.getClassLoader() == null) { |
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49 throw new Error( |
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50 "Trampoline must not be defined by the bootstrap classloader"); |
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51 } |
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52 } |
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53 |
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54 private static void ensureInvocableMethod(Method m) |
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55 throws InvocationTargetException { |
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56 Class<?> clazz = m.getDeclaringClass(); |
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57 if (clazz.equals(AccessController.class) || |
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58 clazz.equals(Method.class) || |
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59 clazz.getName().startsWith("java.lang.invoke.")) |
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60 throw new InvocationTargetException( |
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61 new UnsupportedOperationException("invocation not supported")); |
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62 } |
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63 |
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64 private static Object invoke(Method m, Object obj, Object[] params) |
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65 throws InvocationTargetException, IllegalAccessException { |
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66 ensureInvocableMethod(m); |
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67 return m.invoke(obj, params); |
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68 } |
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69 } |
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70 |
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71 /* |
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72 * Create a trampoline class. |
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73 */ |
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74 public final class MethodUtil extends SecureClassLoader { |
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75 private static final String WS_UTIL_POLICY_PKG = "com.sun.xml.internal.ws.policy.util."; |
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76 private static final String TRAMPOLINE = WS_UTIL_POLICY_PKG + "Trampoline"; |
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77 private static final Method bounce = getTrampoline(); |
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78 private static final int DEFAULT_BUFFER_SIZE = 8192; |
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79 private static final int MAX_BUFFER_SIZE = Integer.MAX_VALUE - 8; |
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80 |
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81 |
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82 private MethodUtil() { |
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83 super(); |
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84 } |
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85 |
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86 /* |
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87 * Bounce through the trampoline. |
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88 */ |
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89 public static Object invoke(Method m, Object obj, Object[] params) |
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90 throws InvocationTargetException, IllegalAccessException { |
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91 try { |
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92 return bounce.invoke(null, m, obj, params); |
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93 } catch (InvocationTargetException ie) { |
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94 Throwable t = ie.getCause(); |
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95 |
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96 if (t instanceof InvocationTargetException) { |
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97 throw (InvocationTargetException) t; |
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98 } else if (t instanceof IllegalAccessException) { |
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99 throw (IllegalAccessException) t; |
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100 } else if (t instanceof RuntimeException) { |
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101 throw (RuntimeException) t; |
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102 } else if (t instanceof Error) { |
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103 throw (Error) t; |
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104 } else { |
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105 throw new Error("Unexpected invocation error", t); |
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106 } |
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107 } catch (IllegalAccessException iae) { |
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108 // this can't happen |
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109 throw new Error("Unexpected invocation error", iae); |
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110 } |
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111 } |
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112 |
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113 private static Method getTrampoline() { |
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114 try { |
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115 return AccessController.doPrivileged( |
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116 new PrivilegedExceptionAction<Method>() { |
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117 public Method run() throws Exception { |
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118 Class<?> t = getTrampolineClass(); |
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119 Method b = t.getDeclaredMethod("invoke", |
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120 Method.class, Object.class, Object[].class); |
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121 b.setAccessible(true); |
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122 return b; |
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123 } |
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124 }); |
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125 } catch (Exception e) { |
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126 throw new InternalError("bouncer cannot be found", e); |
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127 } |
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128 } |
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129 |
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130 |
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131 protected synchronized Class<?> loadClass(String name, boolean resolve) |
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132 throws ClassNotFoundException { |
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133 // First, check if the class has already been loaded |
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134 checkPackageAccess(name); |
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135 Class<?> c = findLoadedClass(name); |
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136 if (c == null) { |
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137 try { |
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138 c = findClass(name); |
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139 } catch (ClassNotFoundException e) { |
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140 // Fall through ... |
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141 } |
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142 if (c == null) { |
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143 c = getParent().loadClass(name); |
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144 } |
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145 } |
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146 if (resolve) { |
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147 resolveClass(c); |
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148 } |
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149 return c; |
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150 } |
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151 |
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152 |
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153 protected Class<?> findClass(final String name) |
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154 throws ClassNotFoundException { |
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155 if (!name.startsWith(WS_UTIL_POLICY_PKG)) { |
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156 throw new ClassNotFoundException(name); |
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157 } |
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158 String path = "/".concat(name.replace('.', '/').concat(".class")); |
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159 try (InputStream in = MethodUtil.class.getResourceAsStream(path)) { |
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160 byte[] b = readAllBytes(in); |
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161 return defineClass(name, b); |
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162 } catch (IOException e) { |
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163 throw new ClassNotFoundException(name, e); |
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164 } |
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165 } |
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166 |
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167 /** |
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168 * JDK9 {@link InputStream#readAllBytes()} substitution. |
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169 */ |
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170 private byte[] readAllBytes(InputStream in) throws IOException { |
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171 byte[] buf = new byte[DEFAULT_BUFFER_SIZE]; |
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172 int capacity = buf.length; |
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173 int nread = 0; |
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174 int n; |
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175 for (; ; ) { |
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176 // read to EOF which may read more or less than initial buffer size |
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177 while ((n = in.read(buf, nread, capacity - nread)) > 0) |
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178 nread += n; |
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179 |
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180 // if the last call to read returned -1, then we're done |
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181 if (n < 0) |
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182 break; |
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183 |
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184 // need to allocate a larger buffer |
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185 if (capacity <= MAX_BUFFER_SIZE - capacity) { |
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186 capacity = capacity << 1; |
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187 } else { |
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188 if (capacity == MAX_BUFFER_SIZE) |
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189 throw new OutOfMemoryError("Required array size too large"); |
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190 capacity = MAX_BUFFER_SIZE; |
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191 } |
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192 buf = Arrays.copyOf(buf, capacity); |
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193 } |
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194 return (capacity == nread) ? buf : Arrays.copyOf(buf, nread); |
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195 } |
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196 |
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197 |
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198 /* |
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199 * Define the proxy classes |
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200 */ |
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201 private Class<?> defineClass(String name, byte[] b) throws IOException { |
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202 CodeSource cs = new CodeSource(null, (java.security.cert.Certificate[]) null); |
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203 if (!name.equals(TRAMPOLINE)) { |
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204 throw new IOException("MethodUtil: bad name " + name); |
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205 } |
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206 return defineClass(name, b, 0, b.length, cs); |
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207 } |
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208 |
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209 protected PermissionCollection getPermissions(CodeSource codesource) { |
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210 PermissionCollection perms = super.getPermissions(codesource); |
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211 perms.add(new AllPermission()); |
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212 return perms; |
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213 } |
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214 |
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215 private static Class<?> getTrampolineClass() { |
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216 try { |
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217 return Class.forName(TRAMPOLINE, true, new MethodUtil()); |
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218 } catch (ClassNotFoundException e) { |
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219 } |
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220 return null; |
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221 } |
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222 |
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223 /** |
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224 * Checks package access on the given classname. |
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225 * This method is typically called when the Class instance is not |
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226 * available and the caller attempts to load a class on behalf |
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227 * the true caller (application). |
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228 */ |
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229 private static void checkPackageAccess(String name) { |
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230 SecurityManager s = System.getSecurityManager(); |
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231 if (s != null) { |
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232 String cname = name.replace('/', '.'); |
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233 if (cname.startsWith("[")) { |
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234 int b = cname.lastIndexOf('[') + 2; |
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235 if (b > 1 && b < cname.length()) { |
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236 cname = cname.substring(b); |
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237 } |
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238 } |
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239 int i = cname.lastIndexOf('.'); |
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240 if (i != -1) { |
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241 s.checkPackageAccess(cname.substring(0, i)); |
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242 } |
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243 } |
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244 } |
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245 |
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246 /** |
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247 * Checks package access on the given class. |
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248 * <p> |
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249 * If it is a {@link Proxy#isProxyClass(Class)} that implements |
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250 * a non-public interface (i.e. may be in a non-restricted package), |
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251 * also check the package access on the proxy interfaces. |
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252 */ |
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253 private static void checkPackageAccess(Class<?> clazz) { |
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254 checkPackageAccess(clazz.getName()); |
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255 if (isNonPublicProxyClass(clazz)) { |
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256 checkProxyPackageAccess(clazz); |
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257 } |
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258 } |
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259 |
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260 // Note that bytecode instrumentation tools may exclude 'sun.*' |
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261 // classes but not generated proxy classes and so keep it in com.sun.* |
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262 private static final String PROXY_PACKAGE = "com.sun.proxy"; |
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263 |
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264 /** |
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265 * Test if the given class is a proxy class that implements |
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266 * non-public interface. Such proxy class may be in a non-restricted |
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267 * package that bypasses checkPackageAccess. |
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268 */ |
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269 private static boolean isNonPublicProxyClass(Class<?> cls) { |
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270 String name = cls.getName(); |
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271 int i = name.lastIndexOf('.'); |
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272 String pkg = (i != -1) ? name.substring(0, i) : ""; |
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273 return Proxy.isProxyClass(cls) && !pkg.startsWith(PROXY_PACKAGE); |
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274 } |
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275 |
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276 /** |
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277 * Check package access on the proxy interfaces that the given proxy class |
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278 * implements. |
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279 * |
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280 * @param clazz Proxy class object |
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281 */ |
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282 private static void checkProxyPackageAccess(Class<?> clazz) { |
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283 SecurityManager s = System.getSecurityManager(); |
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284 if (s != null) { |
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285 // check proxy interfaces if the given class is a proxy class |
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286 if (Proxy.isProxyClass(clazz)) { |
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287 for (Class<?> intf : clazz.getInterfaces()) { |
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288 checkPackageAccess(intf); |
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289 } |
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290 } |
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291 } |
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292 } |
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293 } |