001/* DelegationPermission.java -- kerberos delegation 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.BasicPermission; 042import java.security.Permission; 043import java.security.PermissionCollection; 044import java.util.Enumeration; 045import java.util.Vector; 046 047/** 048 * @since 1.4 049 */ 050public 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}