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1 | /* SecureClassLoader.java --- A Secure Class Loader |
2 | Copyright (C) 1999 Free Software Foundation, Inc. | |
eb4534a6 | 3 | |
28f7d9d0 | 4 | This file is part of GNU Classpath. |
eb4534a6 | 5 | |
28f7d9d0 BM |
6 | GNU Classpath is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU Classpath is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Classpath; see the file COPYING. If not, write to the | |
18 | Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. | |
20 | ||
92aaa246 MW |
21 | Linking this library statically or dynamically with other modules is |
22 | making a combined work based on this library. Thus, the terms and | |
23 | conditions of the GNU General Public License cover the whole | |
24 | combination. | |
25 | ||
26 | As a special exception, the copyright holders of this library give you | |
27 | permission to link this library with independent modules to produce an | |
28 | executable, regardless of the license terms of these independent | |
29 | modules, and to copy and distribute the resulting executable under | |
30 | terms of your choice, provided that you also meet, for each linked | |
31 | independent module, the terms and conditions of the license of that | |
32 | module. An independent module is a module which is not derived from | |
33 | or based on this library. If you modify this library, you may extend | |
34 | this exception to your version of the library, but you are not | |
35 | obligated to do so. If you do not wish to do so, delete this | |
36 | exception statement from your version. */ | |
eb4534a6 KKT |
37 | |
38 | package java.security; | |
39 | ||
28f7d9d0 BM |
40 | /** |
41 | A Secure Class Loader for loading classes with additional | |
42 | support for specifying code source and permissions when | |
43 | they are retrieved by the system policy handler. | |
44 | ||
45 | @since JDK 1.2 | |
46 | ||
47 | @author Mark Benvenuto | |
48 | */ | |
49 | public class SecureClassLoader extends ClassLoader | |
eb4534a6 | 50 | { |
28f7d9d0 BM |
51 | protected SecureClassLoader(ClassLoader parent) |
52 | { | |
53 | super(parent); | |
d2f108e2 BM |
54 | SecurityManager sm = System.getSecurityManager(); |
55 | if(sm != null) | |
56 | sm.checkCreateClassLoader(); | |
28f7d9d0 BM |
57 | } |
58 | ||
59 | protected SecureClassLoader() | |
60 | { | |
d2f108e2 BM |
61 | SecurityManager sm = System.getSecurityManager(); |
62 | if(sm != null) | |
63 | sm.checkCreateClassLoader(); | |
28f7d9d0 | 64 | } |
eb4534a6 | 65 | |
28f7d9d0 BM |
66 | /** |
67 | Creates a class using an array of bytes and a | |
68 | CodeSource. | |
69 | ||
70 | @param name the name to give the class. null if unknown. | |
71 | @param b the data representing the classfile, in classfile format. | |
72 | @param off the offset into the data where the classfile starts. | |
73 | @param len the length of the classfile data in the array. | |
d74732f5 | 74 | @param cs the CodeSource for the class or null when unknown. |
28f7d9d0 BM |
75 | |
76 | @return the class that was defined and optional CodeSource. | |
77 | ||
78 | @exception ClassFormatError if the byte array is not in proper classfile format. | |
79 | */ | |
80 | protected final Class defineClass(String name, byte[] b, int off, int len, | |
81 | CodeSource cs) | |
82 | { | |
83 | // FIXME: Need to cache ProtectionDomains according to 1.3 docs. | |
d74732f5 | 84 | if (cs != null) |
28f7d9d0 | 85 | { |
d74732f5 TT |
86 | ProtectionDomain protectionDomain |
87 | = new ProtectionDomain(cs, getPermissions(cs)); | |
28f7d9d0 | 88 | return super.defineClass(name, b, off, len, protectionDomain); |
d74732f5 TT |
89 | } |
90 | else | |
91 | return super.defineClass(name, b, off, len); | |
28f7d9d0 BM |
92 | } |
93 | ||
94 | /** | |
95 | Returns a PermissionCollection for the specified CodeSource. | |
96 | The default implmentation invokes | |
97 | java.security.Policy.getPermissions. | |
98 | ||
99 | This method is called by defineClass that takes a CodeSource | |
100 | arguement to build a proper ProtectionDomain for the class | |
101 | being defined. | |
102 | ||
103 | */ | |
104 | protected PermissionCollection getPermissions(CodeSource cs) | |
105 | { | |
106 | Policy policy = Policy.getPolicy(); | |
107 | return policy.getPermissions(cs); | |
108 | } | |
109 | } |