001 /* DelegationPermission.java -- kerberos delegation permission
002 Copyright (C) 2006 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 javax.security.auth.kerberos;
040
041 import java.security.BasicPermission;
042 import java.security.Permission;
043 import java.security.PermissionCollection;
044 import java.util.Enumeration;
045 import java.util.Vector;
046
047 /**
048 * @since 1.4
049 */
050 public final class DelegationPermission
051 extends BasicPermission
052 {
053 // FIXME: Enable this when serialization works.
054 // private static final long serialVersionUID = 883133252142523922L;
055
056 /**
057 * Create a new instance with the given name.
058 */
059 public DelegationPermission(String name)
060 {
061 super(name);
062 checkSyntax(name);
063 }
064
065 /**
066 * Create a new instance with the given name and actions.
067 *
068 * The name consists of two parts: first the subordinate
069 * service principal, then the target service principal.
070 * Each principal is surrounded by quotes; the two are separated
071 * by a space.
072 *
073 * @param name the name
074 * @param actions the actions; this is ignored
075 */
076 public DelegationPermission(String name, String actions)
077 {
078 super(name, actions);
079 checkSyntax(name);
080 }
081
082 private static void checkSyntax(String name)
083 {
084 int index = name.indexOf('"', 1);
085 int len = name.length();
086 if (name.charAt(0) != '"' || name.charAt(len - 1) != '"'
087 || index == -1 || index + 3 >= len
088 || name.charAt(index + 1) != ' '
089 || name.charAt(index + 2) != '"')
090 // FIXME: better message here.
091 throw new IllegalArgumentException("invalid syntax for principals");
092 }
093
094 public boolean implies(Permission perm)
095 {
096 return equals(perm);
097 }
098
099 public PermissionCollection newPermissionCollection()
100 {
101 // FIXME: don't know how to serialize here. I suspect this
102 // class has to have a particular name, etc ...
103 return new PermissionCollection()
104 {
105 private Vector permissions = new Vector();
106
107 public void add(Permission perm)
108 {
109 if (isReadOnly())
110 throw new SecurityException("readonly");
111 if (! (perm instanceof DelegationPermission))
112 throw new IllegalArgumentException("can only add DelegationPermissions");
113 permissions.add(perm);
114 }
115
116 public boolean implies(Permission perm)
117 {
118 if (! (perm instanceof DelegationPermission))
119 return false;
120 Enumeration e = elements();
121 while (e.hasMoreElements())
122 {
123 DelegationPermission dp = (DelegationPermission) e.nextElement();
124 if (dp.implies(perm))
125 return true;
126 }
127 return false;
128 }
129
130 public Enumeration elements()
131 {
132 return permissions.elements();
133 }
134 };
135 }
136 }