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    }