001 /* RuntimePermission.java -- permission for a secure runtime action
002 Copyright (C) 1998, 2000, 2002, 2005 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package java.lang;
040
041 import java.security.BasicPermission;
042 import java.security.Permission;
043
044 /**
045 * A <code>RuntimePermission</code> contains a permission name, but no
046 * actions list. This means you either have the permission or you don't.
047 *
048 * Permission names have the follow the hierarchial property naming
049 * convention. In addition, an asterisk may appear at the end of a
050 * name if following a period or by itself.
051 *
052 * <table border=1>
053 * <tr><th>Valid names</th><th>Invalid names</th></tr>
054 * <tr><td>"accessClassInPackage.*","*"</td>
055 * <td>"**", "*x", "*.a"</td></tr>
056 * </table>
057 * <br>
058 *
059 * The following table provides a list of all the possible RuntimePermission
060 * permission names with a description of what that permission allows.<br>
061 * <table border=1>
062 * <tr><th>Permission Name</th><th>Permission Allows</th><th>Risks</th</tr>
063 * <tr>
064 * <td><code>createClassLoader</code></td>
065 * <td>creation of a class loader</td>
066 * <td>a class loader can load rogue classes which bypass all security
067 * permissions</td></tr>
068 * <tr>
069 * <td><code>getClassLoader</code></td>
070 * <td>retrieval of the class loader for the calling class</td>
071 * <td>rogue code could load classes not otherwise available</td></tr>
072 * <tr>
073 * <td><code>setContextClassLoader</code></td>
074 * <td>allows the setting of the context class loader used by a thread</td>
075 * <td>rogue code could change the context class loader needed by system
076 * threads</td></tr>
077 * <tr>
078 * <td><code>setSecurityManager</code></td>
079 * <td>allows the application to replace the security manager</td>
080 * <td>the new manager may be less restrictive, so that rogue code can
081 * bypass existing security checks</td></tr>
082 * <tr>
083 * <td><code>createSecurityManager</code></td>
084 * <td>allows the application to create a new security manager</td>
085 * <td>rogue code can use the new security manager to discover information
086 * about the execution stack</td></tr>
087 * <tr>
088 * <td><code>exitVM</code></td>
089 * <td>allows the application to halt the virtual machine</td>
090 * <td>rogue code can mount a denial-of-service attack by killing the
091 * virtual machine</td></tr>
092 * <tr>
093 * <td><code>shutdownHooks</code></td>
094 * <td>allows registration and modification of shutdown hooks</td>
095 * <td>rogue code can add a hook that interferes with clean
096 * virtual machine shutdown</td></tr>
097 * <tr>
098 * <td><code>setFactory</code></td>
099 * <td>allows the application to set the socket factory for socket,
100 * server socket, stream handler, or RMI socket factory.</td>
101 * <td>rogue code can create a rogue network object which mangles or
102 * intercepts data</td></tr>
103 * <tr>
104 * <td><code>setIO</code></td>
105 * <td>allows the application to set System.out, System.in, and
106 * System.err</td>
107 * <td>rogue code could sniff user input and intercept or mangle
108 * output</td></tr>
109 * <tr>
110 * <td><code>modifyThread</code></td>
111 * <td>allows the application to modify any thread in the virtual machine
112 * using any of the methods <code>stop</code>, <code>resume</code>,
113 * <code>suspend</code>, <code>setPriority</code>, and
114 * <code>setName</code> of classs <code>Thread</code></td>
115 * <td>rogue code could adversely modify system or user threads</td></tr>
116 * <tr>
117 * <td><code>stopThread</code></td>
118 * <td>allows the application to <code>stop</code> any thread it has
119 * access to in the system</td>
120 * <td>rogue code can stop arbitrary threads</td></tr>
121 * <tr>
122 * <td><code>modifyThreadGroup</code></td>
123 * <td>allows the application to modify thread groups using any of the
124 * methods <code>destroy</code>, <code>resume</code>,
125 * <code>setDaemon</code>, <code>setMaxPriority</code>,
126 * <code>stop</code>, and <code>suspend</code> of the class
127 * <code>ThreadGroup</code></td>
128 * <td>rogue code can mount a denial-of-service attack by changing run
129 * priorities</td></tr>
130 * <tr>
131 * <td><code>getProtectionDomain</code></td>
132 * <td>retrieve a class's ProtectionDomain</td>
133 * <td>rogue code can gain information about the security policy, to
134 * prepare a better attack</td></tr>
135 * <tr>
136 * <td><code>readFileDescriptor</code></td>
137 * <td>read a file descriptor</td>
138 * <td>rogue code can read sensitive information</td></tr>
139 * <tr>
140 * <td><code>writeFileDescriptor</code></td>
141 * <td>write a file descriptor</td>
142 * <td>rogue code can write files, including viruses, and can modify the
143 * virtual machine binary; if not just fill up the disk</td></tr>
144 * <tr>
145 * <td><code>loadLibrary.</code><em>library name</em></td>
146 * <td>dynamic linking of the named library</td>
147 * <td>native code can bypass many security checks of pure Java</td></tr>
148 * <tr>
149 * <td><code>accessClassInPackage.</code><em>package name</em></td>
150 * <td>access to a package via a ClassLoader</td>
151 * <td>rogue code can access classes not normally available</td></tr>
152 * <tr>
153 * <td><code>defineClassInPackage.</code><em>package name</em></td>
154 * <td>define a class inside a given package</td>
155 * <td>rogue code can install rogue classes, including in trusted packages
156 * like java.security or java.lang</td></tr>
157 * <tr>
158 * <td><code>accessDeclaredMembers</code></td>
159 * <td>access declared class members via reflection</td>
160 * <td>rogue code can discover information, invoke methods, or modify fields
161 * that are not otherwise available</td></tr>
162 * <tr>
163 * <td><code>queuePrintJob</code></td>
164 * <td>initiate a print job</td>
165 * <td>rogue code could make a hard copy of sensitive information, or
166 * simply waste paper</td></tr>
167 * </table>
168 *
169 * @author Brian Jones
170 * @author Eric Blake (ebb9@email.byu.edu)
171 * @see BasicPermission
172 * @see Permission
173 * @see SecurityManager
174 * @since 1.2
175 * @status updated to 1.4
176 */
177 public final class RuntimePermission extends BasicPermission
178 {
179 /**
180 * Compatible with JDK 1.2+.
181 */
182 private static final long serialVersionUID = 7399184964622342223L;
183
184 /**
185 * Create a new permission with the specified name.
186 *
187 * @param permissionName the name of the granted permission
188 * @throws NullPointerException if name is null
189 * @throws IllegalArgumentException thrown if name is empty or invalid
190 */
191 public RuntimePermission(String permissionName)
192 {
193 super(permissionName);
194 }
195
196 /**
197 * Create a new permission with the specified name. The actions argument
198 * is ignored, as runtime permissions have no actions.
199 *
200 * @param permissionName the name of the granted permission
201 * @param actions ignored
202 * @throws NullPointerException if name is null
203 * @throws IllegalArgumentException thrown if name is empty or invalid
204 */
205 public RuntimePermission(String permissionName, String actions)
206 {
207 super(permissionName);
208 }
209 }