1 /*
2 * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.lang;
27
28 import java.security;
29 import java.util.Enumeration;
30 import java.util.Hashtable;
31 import java.util.StringTokenizer;
32
33 /**
34 * This class is for runtime permissions. A RuntimePermission
35 * contains a name (also referred to as a "target name") but
36 * no actions list; you either have the named permission
37 * or you don't.
38 *
39 * <P>
40 * The target name is the name of the runtime permission (see below). The
41 * naming convention follows the hierarchical property naming convention.
42 * Also, an asterisk
43 * may appear at the end of the name, following a ".", or by itself, to
44 * signify a wildcard match. For example: "loadLibrary.*" or "*" is valid,
45 * "*loadLibrary" or "a*b" is not valid.
46 * <P>
47 * The following table lists all the possible RuntimePermission target names,
48 * and for each provides a description of what the permission allows
49 * and a discussion of the risks of granting code the permission.
50 * <P>
51 *
52 * <table border=1 cellpadding=5 summary="permission target name,
53 * what the target allows,and associated risks">
54 * <tr>
55 * <th>Permission Target Name</th>
56 * <th>What the Permission Allows</th>
57 * <th>Risks of Allowing this Permission</th>
58 * </tr>
59 *
60 * <tr>
61 * <td>createClassLoader</td>
62 * <td>Creation of a class loader</td>
63 * <td>This is an extremely dangerous permission to grant.
64 * Malicious applications that can instantiate their own class
65 * loaders could then load their own rogue classes into the system.
66 * These newly loaded classes could be placed into any protection
67 * domain by the class loader, thereby automatically granting the
68 * classes the permissions for that domain.</td>
69 * </tr>
70 *
71 * <tr>
72 * <td>getClassLoader</td>
73 * <td>Retrieval of a class loader (e.g., the class loader for the calling
74 * class)</td>
75 * <td>This would grant an attacker permission to get the
76 * class loader for a particular class. This is dangerous because
77 * having access to a class's class loader allows the attacker to
78 * load other classes available to that class loader. The attacker
79 * would typically otherwise not have access to those classes.</td>
80 * </tr>
81 *
82 * <tr>
83 * <td>setContextClassLoader</td>
84 * <td>Setting of the context class loader used by a thread</td>
85 * <td>The context class loader is used by system code and extensions
86 * when they need to lookup resources that might not exist in the system
87 * class loader. Granting setContextClassLoader permission would allow
88 * code to change which context class loader is used
89 * for a particular thread, including system threads.</td>
90 * </tr>
91 *
92 * <tr>
93 * <td>enableContextClassLoaderOverride</td>
94 * <td>Subclass implementation of the thread context class loader methods</td>
95 * <td>The context class loader is used by system code and extensions
96 * when they need to lookup resources that might not exist in the system
97 * class loader. Granting enableContextClassLoaderOverride permission would allow
98 * a subclass of Thread to override the methods that are used
99 * to get or set the context class loader for a particular thread.</td>
100 * </tr>
101 *
102 * <tr>
103 * <td>setSecurityManager</td>
104 * <td>Setting of the security manager (possibly replacing an existing one)
105 * </td>
106 * <td>The security manager is a class that allows
107 * applications to implement a security policy. Granting the setSecurityManager
108 * permission would allow code to change which security manager is used by
109 * installing a different, possibly less restrictive security manager,
110 * thereby bypassing checks that would have been enforced by the original
111 * security manager.</td>
112 * </tr>
113 *
114 * <tr>
115 * <td>createSecurityManager</td>
116 * <td>Creation of a new security manager</td>
117 * <td>This gives code access to protected, sensitive methods that may
118 * disclose information about other classes or the execution stack.</td>
119 * </tr>
120 *
121 * <tr>
122 * <td>getenv.{variable name}</td>
123 * <td>Reading of the value of the specified environment variable</td>
124 * <td>This would allow code to read the value, or determine the
125 * existence, of a particular environment variable. This is
126 * dangerous if the variable contains confidential data.</td>
127 * </tr>
128 *
129 * <tr>
130 * <td>exitVM.{exit status}</td>
131 * <td>Halting of the Java Virtual Machine with the specified exit status</td>
132 * <td>This allows an attacker to mount a denial-of-service attack
133 * by automatically forcing the virtual machine to halt.
134 * Note: The "exitVM.*" permission is automatically granted to all code
135 * loaded from the application class path, thus enabling applications
136 * to terminate themselves. Also, the "exitVM" permission is equivalent to
137 * "exitVM.*".</td>
138 * </tr>
139 *
140 * <tr>
141 * <td>shutdownHooks</td>
142 * <td>Registration and cancellation of virtual-machine shutdown hooks</td>
143 * <td>This allows an attacker to register a malicious shutdown
144 * hook that interferes with the clean shutdown of the virtual machine.</td>
145 * </tr>
146 *
147 * <tr>
148 * <td>setFactory</td>
149 * <td>Setting of the socket factory used by ServerSocket or Socket,
150 * or of the stream handler factory used by URL</td>
151 * <td>This allows code to set the actual implementation
152 * for the socket, server socket, stream handler, or RMI socket factory.
153 * An attacker may set a faulty implementation which mangles the data
154 * stream.</td>
155 * </tr>
156 *
157 * <tr>
158 * <td>setIO</td>
159 * <td>Setting of System.out, System.in, and System.err</td>
160 * <td>This allows changing the value of the standard system streams.
161 * An attacker may change System.in to monitor and
162 * steal user input, or may set System.err to a "null" OutputStream,
163 * which would hide any error messages sent to System.err. </td>
164 * </tr>
165 *
166 * <tr>
167 * <td>modifyThread</td>
168 * <td>Modification of threads, e.g., via calls to Thread
169 * <tt>interrupt</tt>, <tt>stop</tt>, <tt>suspend</tt>,
170 * <tt>resume</tt>, <tt>setDaemon</tt>, <tt>setPriority</tt>,
171 * <tt>setName</tt> and <tt>setUncaughtExceptionHandler</tt>
172 * methods</td>
173 * <td>This allows an attacker to modify the behaviour of
174 * any thread in the system.</td>
175 * </tr>
176 *
177 * <tr>
178 * <td>stopThread</td>
179 * <td>Stopping of threads via calls to the Thread <code>stop</code>
180 * method</td>
181 * <td>This allows code to stop any thread in the system provided that it is
182 * already granted permission to access that thread.
183 * This poses as a threat, because that code may corrupt the system by
184 * killing existing threads.</td>
185 * </tr>
186 *
187 * <tr>
188 * <td>modifyThreadGroup</td>
189 * <td>modification of thread groups, e.g., via calls to ThreadGroup
190 * <code>destroy</code>, <code>getParent</code>, <code>resume</code>,
191 * <code>setDaemon</code>, <code>setMaxPriority</code>, <code>stop</code>,
192 * and <code>suspend</code> methods</td>
193 * <td>This allows an attacker to create thread groups and
194 * set their run priority.</td>
195 * </tr>
196 *
197 * <tr>
198 * <td>getProtectionDomain</td>
199 * <td>Retrieval of the ProtectionDomain for a class</td>
200 * <td>This allows code to obtain policy information
201 * for a particular code source. While obtaining policy information
202 * does not compromise the security of the system, it does give
203 * attackers additional information, such as local file names for
204 * example, to better aim an attack.</td>
205 * </tr>
206 *
207 * <tr>
208 * <td>getFileSystemAttributes</td>
209 * <td>Retrieval of file system attributes</td>
210 * <td>This allows code to obtain file system information such as disk usage
211 * or disk space available to the caller. This is potentially dangerous
212 * because it discloses information about the system hardware
213 * configuration and some information about the caller's privilege to
214 * write files.</td>
215 * </tr>
216 *
217 * <tr>
218 * <td>readFileDescriptor</td>
219 * <td>Reading of file descriptors</td>
220 * <td>This would allow code to read the particular file associated
221 * with the file descriptor read. This is dangerous if the file
222 * contains confidential data.</td>
223 * </tr>
224 *
225 * <tr>
226 * <td>writeFileDescriptor</td>
227 * <td>Writing to file descriptors</td>
228 * <td>This allows code to write to a particular file associated
229 * with the descriptor. This is dangerous because it may allow
230 * malicious code to plant viruses or at the very least, fill up
231 * your entire disk.</td>
232 * </tr>
233 *
234 * <tr>
235 * <td>loadLibrary.{library name}</td>
236 * <td>Dynamic linking of the specified library</td>
237 * <td>It is dangerous to allow an applet permission to load native code
238 * libraries, because the Java security architecture is not designed to and
239 * does not prevent malicious behavior at the level of native code.</td>
240 * </tr>
241 *
242 * <tr>
243 * <td>accessClassInPackage.{package name}</td>
244 * <td>Access to the specified package via a class loader's
245 * <code>loadClass</code> method when that class loader calls
246 * the SecurityManager <code>checkPackageAccess</code> method</td>
247 * <td>This gives code access to classes in packages
248 * to which it normally does not have access. Malicious code
249 * may use these classes to help in its attempt to compromise
250 * security in the system.</td>
251 * </tr>
252 *
253 * <tr>
254 * <td>defineClassInPackage.{package name}</td>
255 * <td>Definition of classes in the specified package, via a class
256 * loader's <code>defineClass</code> method when that class loader calls
257 * the SecurityManager <code>checkPackageDefinition</code> method.</td>
258 * <td>This grants code permission to define a class
259 * in a particular package. This is dangerous because malicious
260 * code with this permission may define rogue classes in
261 * trusted packages like <code>java.security</code> or <code>java.lang</code>,
262 * for example.</td>
263 * </tr>
264 *
265 * <tr>
266 * <td>accessDeclaredMembers</td>
267 * <td>Access to the declared members of a class</td>
268 * <td>This grants code permission to query a class for its public,
269 * protected, default (package) access, and private fields and/or
270 * methods. Although the code would have
271 * access to the private and protected field and method names, it would not
272 * have access to the private/protected field data and would not be able
273 * to invoke any private methods. Nevertheless, malicious code
274 * may use this information to better aim an attack.
275 * Additionally, it may invoke any public methods and/or access public fields
276 * in the class. This could be dangerous if
277 * the code would normally not be able to invoke those methods and/or
278 * access the fields because
279 * it can't cast the object to the class/interface with those methods
280 * and fields.
281 </td>
282 * </tr>
283 * <tr>
284 * <td>queuePrintJob</td>
285 * <td>Initiation of a print job request</td>
286 * <td>This could print sensitive information to a printer,
287 * or simply waste paper.</td>
288 * </tr>
289 *
290 * <tr>
291 * <td>getStackTrace</td>
292 * <td>Retrieval of the stack trace information of another thread.</td>
293 * <td>This allows retrieval of the stack trace information of
294 * another thread. This might allow malicious code to monitor the
295 * execution of threads and discover vulnerabilities in applications.</td>
296 * </tr>
297 *
298 * <tr>
299 * <td>setDefaultUncaughtExceptionHandler</td>
300 * <td>Setting the default handler to be used when a thread
301 * terminates abruptly due to an uncaught exception</td>
302 * <td>This allows an attacker to register a malicious
303 * uncaught exception handler that could interfere with termination
304 * of a thread</td>
305 * </tr>
306 *
307 * <tr>
308 * <td>preferences</td>
309 * <td>Represents the permission required to get access to the
310 * java.util.prefs.Preferences implementations user or system root
311 * which in turn allows retrieval or update operations within the
312 * Preferences persistent backing store.) </td>
313 * <td>This permission allows the user to read from or write to the
314 * preferences backing store if the user running the code has
315 * sufficient OS privileges to read/write to that backing store.
316 * The actual backing store may reside within a traditional filesystem
317 * directory or within a registry depending on the platform OS</td>
318 * </tr>
319 *
320 * <tr>
321 * <td>usePolicy</td>
322 * <td>Granting this permission disables the Java Plug-In's default
323 * security prompting behavior.</td>
324 * <td>For more information, refer to Java Plug-In's guides, <a href=
325 * "../../../technotes/guides/plugin/developer_guide/security.html">
326 * Applet Security Basics</a> and <a href=
327 * "../../../technotes/guides/plugin/developer_guide/rsa_how.html#use">
328 * usePolicy Permission</a>.</td>
329 * </tr>
330 * </table>
331 *
332 * @see java.security.BasicPermission
333 * @see java.security.Permission
334 * @see java.security.Permissions
335 * @see java.security.PermissionCollection
336 * @see java.lang.SecurityManager
337 *
338 *
339 * @author Marianne Mueller
340 * @author Roland Schemers
341 */
342
343 public final class RuntimePermission extends BasicPermission {
344
345 private static final long serialVersionUID = 7399184964622342223L;
346
347 /**
348 * Creates a new RuntimePermission with the specified name.
349 * The name is the symbolic name of the RuntimePermission, such as
350 * "exit", "setFactory", etc. An asterisk
351 * may appear at the end of the name, following a ".", or by itself, to
352 * signify a wildcard match.
353 *
354 * @param name the name of the RuntimePermission.
355 *
356 * @throws NullPointerException if <code>name</code> is <code>null</code>.
357 * @throws IllegalArgumentException if <code>name</code> is empty.
358 */
359
360 public RuntimePermission(String name)
361 {
362 super(name);
363 }
364
365 /**
366 * Creates a new RuntimePermission object with the specified name.
367 * The name is the symbolic name of the RuntimePermission, and the
368 * actions String is currently unused and should be null.
369 *
370 * @param name the name of the RuntimePermission.
371 * @param actions should be null.
372 *
373 * @throws NullPointerException if <code>name</code> is <code>null</code>.
374 * @throws IllegalArgumentException if <code>name</code> is empty.
375 */
376
377 public RuntimePermission(String name, String actions)
378 {
379 super(name, actions);
380 }
381 }
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