001/* ServicePermission.java -- kerberos service permission 002 Copyright (C) 2006 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package javax.security.auth.kerberos; 040 041import java.security.Permission; 042import java.security.PermissionCollection; 043import java.util.Enumeration; 044import java.util.StringTokenizer; 045import 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 */ 054public 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}