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 }