/*
    *  Licensed to the Apache Software Foundation (ASF) under one
    *  or more contributor license agreements.  See the NOTICE file
    *  distributed with this work for additional information
    *  regarding copyright ownership.  The ASF licenses this file
    *  to you under the Apache License, Version 2.0 (the
    *  "License"); you may not use this file except in compliance
    *  with the License.  You may obtain a copy of the License at
    *  
   *    http://www.apache.org/licenses/LICENSE-2.0
   *  
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License. 
   *  
   */
  package org.apache.directory.server.ldap.handlers.ssl;
  
  
  import java.security.SecureRandom;
  import java.util.List;
  
  import javax.net.ssl.SSLContext;
  import javax.net.ssl.TrustManager;
  
  import org.apache.directory.api.ldap.model.exception.LdapException;
  import org.apache.directory.ldap.client.api.NoVerificationTrustManager;
  import org.apache.directory.server.i18n.I18n;
  import org.apache.directory.server.ldap.LdapServer;
  import org.apache.directory.server.protocol.shared.transport.TcpTransport;
  import org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder;
  import org.apache.mina.core.filterchain.IoFilterChainBuilder;
  import org.apache.mina.filter.ssl.SslFilter;
  
  
  /**
   * Loads the certificate file for LDAPS support and creates the appropriate
   * MINA filter chain.
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   *
   */
  public final class LdapsInitializer
  {
      private LdapsInitializer()
      {
      }
  
  
      /**
       * Initialize the LDAPS server.
       *
       * @param ldapServer The LDAP server instance
       * @param transport The TCP transport that contains the SSL configuration
       * @return A IoFilter chain
       * @throws LdapException If we had a pb
       */
      public static IoFilterChainBuilder init( LdapServer ldapServer, TcpTransport transport ) throws LdapException
      {
          SSLContext sslCtx;
  
          try
          {
              // Initialize the SSLContext to work with our key managers.
              sslCtx = SSLContext.getInstance( "TLS" );
              sslCtx.init( ldapServer.getKeyManagerFactory().getKeyManagers(), new TrustManager[]
                  { new NoVerificationTrustManager() }, new SecureRandom() );
          }
          catch ( Exception e )
          {
              throw new LdapException( I18n.err( I18n.ERR_683 ), e );
          }
  
          DefaultIoFilterChainBuilder chain = new DefaultIoFilterChainBuilder();
          SslFilter sslFilter = new SslFilter( sslCtx );
  
          // The ciphers
          List<String> cipherSuites = transport.getCipherSuite();
  
          if ( ( cipherSuites != null ) && !cipherSuites.isEmpty() )
          {
              sslFilter.setEnabledCipherSuites( cipherSuites.toArray( new String[cipherSuites.size()] ) );
          }
  
          // The protocols
          List<String> enabledProtocols = transport.getEnabledProtocols();
  
          if ( ( enabledProtocols != null ) && !enabledProtocols.isEmpty() )
          {
              sslFilter.setEnabledProtocols( enabledProtocols.toArray( new String[enabledProtocols.size()] ) );
          }
          else
          {
              // Be sure we disable SSLV3
              sslFilter.setEnabledProtocols( new String[]
                  { "TLSv1", "TLSv1.1", "TLSv1.2" } );
         }
 
         // The remaining SSL parameters
         sslFilter.setNeedClientAuth( transport.isNeedClientAuth() );
         sslFilter.setWantClientAuth( transport.isWantClientAuth() );
 
         chain.addLast( "sslFilter", sslFilter );
 
         return chain;
     }
 }