001 /* Configuration.java 002 Copyright (C) 2004, 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.login; 040 041 import gnu.javax.security.auth.login.GnuConfiguration; 042 043 import java.security.AccessController; 044 import java.security.PrivilegedAction; 045 import java.security.Security; 046 047 import javax.security.auth.AuthPermission; 048 049 public abstract class Configuration 050 { 051 // Fields. 052 // ------------------------------------------------------------------------- 053 054 private static Configuration config; 055 056 // Constructors. 057 // ------------------------------------------------------------------------- 058 059 protected Configuration() 060 { 061 } 062 063 // Class methods. 064 // ------------------------------------------------------------------------- 065 066 public static synchronized Configuration getConfiguration() 067 { 068 SecurityManager sm = System.getSecurityManager(); 069 if (sm != null) 070 sm.checkPermission (new AuthPermission ("getLoginConfiguration")); 071 return getConfig(); 072 } 073 074 public static synchronized void setConfiguration (Configuration config) 075 { 076 SecurityManager sm = System.getSecurityManager(); 077 if (sm != null) 078 sm.checkPermission (new AuthPermission ("setLoginConfiguration")); 079 Configuration.config = config; 080 } 081 082 // Abstract methods. 083 // ------------------------------------------------------------------------- 084 085 public abstract AppConfigurationEntry[] getAppConfigurationEntry (String applicationName); 086 087 public abstract void refresh(); 088 089 // Package-private methods. 090 // ------------------------------------------------------------------------- 091 092 /** 093 * Get the current configuration, bypassing security checks. 094 */ 095 static Configuration getConfig() 096 { 097 if (config == null) 098 { 099 String conf = (String) AccessController.doPrivileged 100 (new PrivilegedAction() 101 { 102 public Object run() 103 { 104 return Security.getProperty ("login.configuration.provider"); 105 } 106 }); 107 try 108 { 109 if (conf != null) 110 config = (Configuration) Class.forName (conf).newInstance(); 111 else 112 config = new GnuConfiguration(); 113 } 114 catch (Exception x) 115 { 116 config = new GnuConfiguration(); 117 } 118 } 119 return config; 120 } 121 }