001/* Configuration.java
002   Copyright (C) 2004, 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.login;
040
041import gnu.javax.security.auth.login.GnuConfiguration;
042
043import java.security.AccessController;
044import java.security.PrivilegedAction;
045import java.security.Security;
046
047import javax.security.auth.AuthPermission;
048
049public 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}