001 /* ServicePermission.java -- kerberos service 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.Permission;
042 import java.security.PermissionCollection;
043 import java.util.Enumeration;
044 import java.util.StringTokenizer;
045 import java.util.Vector;
046
047 /**
048 * This represents permission to access to a Kerberos service principal.
049 * See the Kerberos authentication RFC for more information:
050 * <a href="http://www.ietf.org/rfc/rfc1510.txt">RFC 1510</a>.
051 *
052 * @since 1.4
053 */
054 public final class ServicePermission
055 extends Permission
056 {
057 // FIXME: Enable this when serialization works.
058 // private static final long serialVersionUID = -1227585031618624935L;
059
060 private static final int INITIATE = 1;
061 private static final int ACCEPT = 2;
062
063 private int flags;
064
065 /**
066 * Create a new service permission with the indicated name and actions.
067 *
068 * The name is the name of the kerberos principal for the service.
069 *
070 * The actions are a comma-separated list of strings. The recognized
071 * actions are "initiate" and "accept". The "initiate" action means
072 * that the holder of the permission can access the service. The
073 * "accept" action means that the holder of the permission can operate
074 * as this service.
075 *
076 * @param name the prinicpal's name
077 * @param action the allowed actions
078 */
079 public ServicePermission(String name, String action)
080 {
081 super(name);
082 parseActions(action);
083 }
084
085 public boolean implies(Permission perm)
086 {
087 if (! (perm instanceof ServicePermission))
088 return false;
089 ServicePermission sp = (ServicePermission) perm;
090 if ((flags & sp.flags) != sp.flags)
091 return false;
092 return getName().equals(sp.getName());
093 }
094
095 public boolean equals(Object obj)
096 {
097 if (! (obj instanceof ServicePermission))
098 return false;
099 ServicePermission sp = (ServicePermission) obj;
100 return flags == sp.flags && getName().equals(sp.getName());
101 }
102
103 public int hashCode()
104 {
105 return getName().hashCode() + flags;
106 }
107
108 /**
109 * Return a string representing the actions.
110 */
111 public String getActions()
112 {
113 if (flags == (INITIATE | ACCEPT))
114 return "initiate,accept";
115 if (flags == INITIATE)
116 return "initiate";
117 if (flags == ACCEPT)
118 return "accept";
119 return "";
120 }
121
122 public PermissionCollection newPermissionCollection()
123 {
124 return new PermissionCollection()
125 {
126 private Vector permissions = new Vector();
127
128 public void add(Permission perm)
129 {
130 if (isReadOnly())
131 throw new SecurityException("readonly");
132 if (! (perm instanceof ServicePermission))
133 throw new IllegalArgumentException("can only add DelegationPermissions");
134 permissions.add(perm);
135 }
136
137 public boolean implies(Permission perm)
138 {
139 if (! (perm instanceof ServicePermission))
140 return false;
141 Enumeration e = elements();
142 while (e.hasMoreElements())
143 {
144 ServicePermission sp = (ServicePermission) e.nextElement();
145 if (sp.implies(perm))
146 return true;
147 }
148 return false;
149 }
150
151 public Enumeration elements()
152 {
153 return permissions.elements();
154 }
155 };
156 }
157
158 private void parseActions(String actions)
159 {
160 StringTokenizer tok = new StringTokenizer(actions, ",");
161 while (tok.hasMoreTokens())
162 {
163 String token = tok.nextToken();
164 if ("accept".equals(token))
165 flags |= ACCEPT;
166 else if ("initiate".equals(token))
167 flags |= INITIATE;
168 else
169 throw new IllegalArgumentException("unrecognized token: " + token);
170 }
171 }
172 }