Source for javax.net.ssl.SSLServerSocketFactory

   1: /* SSLServerSocketFactory.java -- factory for SSL server sockets.
   2:    Copyright (C) 2004 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package javax.net.ssl;
  40: 
  41: import java.io.IOException;
  42: import java.net.InetAddress;
  43: import java.net.ServerSocket;
  44: import java.security.KeyStore;
  45: import java.security.Security;
  46: 
  47: import javax.net.ServerSocketFactory;
  48: 
  49: /**
  50:  * A server socket factory for <i>Secure Socket Layer</i> (<b>SSL</b>)
  51:  * server sockets.
  52:  */
  53: public abstract class SSLServerSocketFactory extends ServerSocketFactory
  54: {
  55:   // Field.
  56:   // -------------------------------------------------------------------------
  57: 
  58:   private static SSLContext context;
  59: 
  60:   // Constructor.
  61:   // -------------------------------------------------------------------------
  62: 
  63:   protected SSLServerSocketFactory()
  64:   {
  65:     super();
  66:   }
  67: 
  68:   // Class methods.
  69:   // -------------------------------------------------------------------------
  70: 
  71:   /**
  72:    * Returns a default implementation of a SSL server socket factory.
  73:    *
  74:    * <p>To control the class that gets returned by this method, set the
  75:    * security property "ssl.ServerSocketFactory.provider" to the class
  76:    * name of a concrete implementation of this class. If not set, a
  77:    * system-dependent implementation will be used.</p>
  78:    *
  79:    * <p>The implementation returned is created by the first implementation
  80:    * of the {@link SSLContext} class found, which is initialized with
  81:    * default parameters. To control the key and trust manager factory
  82:    * algorithms used as defaults, set the security properties
  83:    * "ssl.keyManagerFactory.algorithm" and "ssl.trustManagerFactory.algorithm"
  84:    * to the appropriate names.</p>
  85:    *
  86:    * <p>Using this method is not recommended. Instead, use the methods of
  87:    * {@link SSLContext}, which provide much better control over the
  88:    * creation of server socket factories.</p>
  89:    *
  90:    * @return The default server socket factory.
  91:    * @throws RuntimeException If no default can be created.
  92:    */
  93:   public static synchronized ServerSocketFactory getDefault()
  94:   {
  95:     try
  96:       {
  97:         String s = Security.getProperty("ssl.ServerSocketFactory.provider");
  98:         ClassLoader cl = ClassLoader.getSystemClassLoader();
  99:         if (s != null && cl != null)
 100:           {
 101:             return (ServerSocketFactory) cl.loadClass(s).newInstance();
 102:           }
 103:       }
 104:     catch (Exception e)
 105:       {
 106:       }
 107:     if (context == null)
 108:       {
 109:         KeyManager[] km = null;
 110:         TrustManager[] tm = null;
 111: 
 112:         // 1. Determine which algorithms to use for the key and trust
 113:         // manager factories.
 114:         String kmAlg = KeyManagerFactory.getDefaultAlgorithm();
 115:         String tmAlg = TrustManagerFactory.getDefaultAlgorithm();
 116:         // 2. Try to initialize the factories with default parameters.
 117:         try
 118:           {
 119:             KeyManagerFactory kmf = KeyManagerFactory.getInstance(kmAlg);
 120:             kmf.init(null, null);
 121:             km = kmf.getKeyManagers();
 122:           }
 123:         catch (Exception ex)
 124:           {
 125:           }
 126:         try
 127:           {
 128:             TrustManagerFactory tmf = TrustManagerFactory.getInstance(tmAlg);
 129:             tmf.init((KeyStore) null);
 130:             tm = tmf.getTrustManagers();
 131:           }
 132:         catch (Exception ex)
 133:           {
 134:           }
 135: 
 136:         // 3. Create and initialize a context.
 137:         try
 138:           {
 139:             context = SSLContext.getInstance("SSLv3");
 140:             context.init(km, tm, null);
 141:           }
 142:         catch (Exception ex)
 143:           {
 144:             return new ErrorServerSocketFactory(new RuntimeException(
 145:                 "error instantiating default server socket factory: "
 146:                                        + ex.toString(), ex));
 147:           }
 148:       }
 149:     try
 150:       {
 151:         return context.getServerSocketFactory();
 152:       }
 153:     catch (Exception e)
 154:       {
 155:       }
 156:     return new ErrorServerSocketFactory(new RuntimeException(
 157:         "no SSLSocketFactory implementation available"));
 158:   }
 159: 
 160:   private static final class ErrorServerSocketFactory
 161:     extends SSLServerSocketFactory
 162:   {
 163:     private RuntimeException x;
 164: 
 165:     ErrorServerSocketFactory(RuntimeException x)
 166:     {
 167:       this.x = x;
 168:     }
 169: 
 170:     public ServerSocket createServerSocket() throws IOException
 171:     {
 172:       throw (IOException) new IOException().initCause(x);
 173:     }
 174: 
 175:     public ServerSocket createServerSocket(int port) throws IOException
 176:     {
 177:       throw (IOException) new IOException().initCause(x);
 178:     }
 179: 
 180:     public ServerSocket createServerSocket(int port, int backlog)
 181:       throws IOException
 182:     {
 183:       throw (IOException) new IOException().initCause(x);
 184:     }
 185: 
 186:     public ServerSocket createServerSocket(int port, int backlog,
 187:                                            InetAddress ifAddress)
 188:       throws IOException
 189:     {
 190:       throw (IOException) new IOException().initCause(x);
 191:     }
 192: 
 193:     public String[] getDefaultCipherSuites()
 194:     {
 195:       throw new RuntimeException(x);
 196:     }
 197: 
 198:     public String[] getSupportedCipherSuites()
 199:     {
 200:       throw new RuntimeException(x);
 201:     }
 202:   }
 203: 
 204:   // Abstract methods.
 205:   // -------------------------------------------------------------------------
 206: 
 207:   /**
 208:    * Returns the list of cipher suites that will be enabled in server sockets
 209:    * created by this factory.
 210:    *
 211:    * @return The default cipher suites.
 212:    */
 213:   public abstract String[] getDefaultCipherSuites();
 214: 
 215:   /**
 216:    * Returns the list of all cipher suites supported by this factory.
 217:    *
 218:    * @return The list of supported cipher suites.
 219:    */
 220:   public abstract String[] getSupportedCipherSuites();
 221: }