// ========================================================================
   // Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
   // ------------------------------------------------------------------------
   // All rights reserved. This program and the accompanying materials
   // are made available under the terms of the Eclipse Public License v1.0
   // and Apache License v2.0 which accompanies this distribution.
   // The Eclipse Public License is available at 
   // http://www.eclipse.org/legal/epl-v10.html
   // The Apache License v2.0 is available at
  // http://www.opensource.org/licenses/apache2.0.php
  // You may elect to redistribute this code under either of these licenses. 
  // ========================================================================
  
  package org.eclipse.jetty.server.ssl;
  
  import java.io.ByteArrayInputStream;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.ByteBuffer;
  import java.nio.channels.SelectionKey;
  import java.nio.channels.SocketChannel;
  import java.security.KeyStore;
  import java.security.SecureRandom;
  import java.security.Security;
  import java.security.cert.X509Certificate;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.concurrent.ConcurrentLinkedQueue;
  
  import javax.net.ssl.KeyManager;
  import javax.net.ssl.KeyManagerFactory;
  import javax.net.ssl.SSLContext;
  import javax.net.ssl.SSLEngine;
  import javax.net.ssl.SSLPeerUnverifiedException;
  import javax.net.ssl.SSLSession;
  import javax.net.ssl.SSLSocket;
  import javax.net.ssl.TrustManager;
  import javax.net.ssl.TrustManagerFactory;
  
  import org.eclipse.jetty.http.HttpParser;
  import org.eclipse.jetty.http.HttpSchemes;
  import org.eclipse.jetty.http.security.Password;
  import org.eclipse.jetty.http.ssl.SslSelectChannelEndPoint;
  import org.eclipse.jetty.io.Buffer;
  import org.eclipse.jetty.io.Connection;
  import org.eclipse.jetty.io.EndPoint;
  import org.eclipse.jetty.io.bio.SocketEndPoint;
  import org.eclipse.jetty.io.nio.DirectNIOBuffer;
  import org.eclipse.jetty.io.nio.IndirectNIOBuffer;
  import org.eclipse.jetty.io.nio.NIOBuffer;
  import org.eclipse.jetty.io.nio.SelectChannelEndPoint;
  import org.eclipse.jetty.io.nio.SelectorManager.SelectSet;
  import org.eclipse.jetty.server.HttpConnection;
  import org.eclipse.jetty.server.Request;
  import org.eclipse.jetty.server.nio.SelectChannelConnector;
  import org.eclipse.jetty.util.TypeUtil;
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.resource.Resource;
  
  /* ------------------------------------------------------------ */
  /**
   * SslSelectChannelConnector.
   * 
   * @org.apache.xbean.XBean element="sslConnector" description="Creates an NIO ssl connector"
   *
   * 
   * 
   */
  public class SslSelectChannelConnector extends SelectChannelConnector
  {
      /**
       * The name of the SSLSession attribute that will contain any cached
       * information.
       */
      static final String CACHED_INFO_ATTR=CachedInfo.class.getName();
  
      /** Default value for the keystore location path. */
      public static final String DEFAULT_KEYSTORE=System.getProperty("user.home")+File.separator+".keystore";
  
      /** String name of key password property. */
      public static final String KEYPASSWORD_PROPERTY="jetty.ssl.keypassword";
  
      /** String name of keystore password property. */
      public static final String PASSWORD_PROPERTY="jetty.ssl.password";
  
      /** Default value for the cipher Suites. */
      private String _excludeCipherSuites[]=null;
  
      /** Default value for the keystore location path. */
      private String _keystore=DEFAULT_KEYSTORE;
      private String _keystoreType="JKS"; // type of the key store
  
      /** Set to true if we require client certificate authentication. */
      private boolean _needClientAuth=false;
      private boolean _wantClientAuth=false;
  
      private transient Password _password;
     private transient Password _keyPassword;
     private transient Password _trustPassword;
     private String _protocol="TLS";
     private String _algorithm="SunX509"; // cert algorithm
     private String _provider;
     private String _secureRandomAlgorithm; // cert algorithm
     private String _sslKeyManagerFactoryAlgorithm=(Security.getProperty("ssl.KeyManagerFactory.algorithm")==null?"SunX509":Security
             .getProperty("ssl.KeyManagerFactory.algorithm")); // cert
                                                                 // algorithm
 
     private String _sslTrustManagerFactoryAlgorithm=(Security.getProperty("ssl.TrustManagerFactory.algorithm")==null?"SunX509":Security
             .getProperty("ssl.TrustManagerFactory.algorithm")); // cert
                                                                 // algorithm
 
     private String _truststore;
     private String _truststoreType="JKS"; // type of the key store
     private SSLContext _context;
 
     private int _packetBufferSize;
     private int _applicationBufferSize;
     private ConcurrentLinkedQueue<Buffer> _packetBuffers = new ConcurrentLinkedQueue<Buffer>();
     private ConcurrentLinkedQueue<Buffer> _applicationBuffers = new ConcurrentLinkedQueue<Buffer>();
     
     /* ------------------------------------------------------------ */
     /* (non-Javadoc)
      * @see org.eclipse.jetty.io.AbstractBuffers#getBuffer(int)
      */
     public Buffer getBuffer(int size)
     {
         // TODO why is this reimplemented?
         Buffer buffer;
         if (size==_applicationBufferSize)
         {   
             buffer = _applicationBuffers.poll();
             if (buffer==null)
                 buffer=new IndirectNIOBuffer(size);
         }
         else if (size==_packetBufferSize)
         {   
             buffer = _packetBuffers.poll();
             if (buffer==null)
                 buffer=getUseDirectBuffers()
                     ?(NIOBuffer)new DirectNIOBuffer(size)
                     :(NIOBuffer)new IndirectNIOBuffer(size);
         }
         else 
             buffer=super.getBuffer(size);
         
         return buffer;
     }
 
     /* ------------------------------------------------------------ */
     /* (non-Javadoc)
      * @see org.eclipse.jetty.io.AbstractBuffers#returnBuffer(org.eclipse.io.Buffer)
      */
     public void returnBuffer(Buffer buffer)
     {
         buffer.clear();
         int size=buffer.capacity();
         ByteBuffer bbuf = ((NIOBuffer)buffer).getByteBuffer();
         bbuf.position(0);
         bbuf.limit(size);
         
         if (size==_applicationBufferSize)
             _applicationBuffers.add(buffer);
         else if (size==_packetBufferSize)
             _packetBuffers.add(buffer);
         else 
             super.returnBuffer(buffer);
     }
     
     
 
     /**
      * Return the chain of X509 certificates used to negotiate the SSL Session.
      * <p>
      * Note: in order to do this we must convert a
      * javax.security.cert.X509Certificate[], as used by JSSE to a
      * java.security.cert.X509Certificate[],as required by the Servlet specs.
      * 
      * @param sslSession
      *                the javax.net.ssl.SSLSession to use as the source of the
      *                cert chain.
      * @return the chain of java.security.cert.X509Certificates used to
      *         negotiate the SSL connection. <br>
      *         Will be null if the chain is missing or empty.
      */
     private static X509Certificate[] getCertChain(SSLSession sslSession)
     {
         try
         {
             javax.security.cert.X509Certificate javaxCerts[]=sslSession.getPeerCertificateChain();
             if (javaxCerts==null||javaxCerts.length==0)
                 return null;
 
             int length=javaxCerts.length;
             X509Certificate[] javaCerts=new X509Certificate[length];
 
             java.security.cert.CertificateFactory cf=java.security.cert.CertificateFactory.getInstance("X.509");
             for (int i=0; i<length; i++)
             {
                 byte bytes[]=javaxCerts[i].getEncoded();
                 ByteArrayInputStream stream=new ByteArrayInputStream(bytes);
                 javaCerts[i]=(X509Certificate)cf.generateCertificate(stream);
             }
 
             return javaCerts;
         }
         catch (SSLPeerUnverifiedException pue)
         {
             return null;
         }
         catch (Exception e)
         {
             Log.warn(Log.EXCEPTION,e);
             return null;
         }
     }
 
   
     /* ------------------------------------------------------------ */
     /**
      * Allow the Listener a chance to customise the request. before the server
      * does its stuff. <br>
      * This allows the required attributes to be set for SSL requests. <br>
      * The requirements of the Servlet specs are:
      * <ul>
      * <li> an attribute named "javax.servlet.request.ssl_session_id" of type
      * String (since Servlet Spec 3.0).</li>
      * <li> an attribute named "javax.servlet.request.cipher_suite" of type
      * String.</li>
      * <li> an attribute named "javax.servlet.request.key_size" of type Integer.</li>
      * <li> an attribute named "javax.servlet.request.X509Certificate" of type
      * java.security.cert.X509Certificate[]. This is an array of objects of type
      * X509Certificate, the order of this array is defined as being in ascending
      * order of trust. The first certificate in the chain is the one set by the
      * client, the next is the one used to authenticate the first, and so on.
      * </li>
      * </ul>
      * 
      * @param endpoint
      *                The Socket the request arrived on. This should be a
      *                {@link SocketEndPoint} wrapping a {@link SSLSocket}.
      * @param request
      *                HttpRequest to be customised.
      */
     @Override
     public void customize(EndPoint endpoint, Request request) throws IOException
     {
         super.customize(endpoint,request);
         request.setScheme(HttpSchemes.HTTPS);
         
         SslSelectChannelEndPoint sslHttpChannelEndpoint=(SslSelectChannelEndPoint)endpoint;
         
         SSLEngine sslEngine=sslHttpChannelEndpoint.getSSLEngine();
 
         try
         {
             SSLSession sslSession=sslEngine.getSession();
             String cipherSuite=sslSession.getCipherSuite();
             Integer keySize;
             X509Certificate[] certs;
             String idStr;
 
             CachedInfo cachedInfo=(CachedInfo)sslSession.getValue(CACHED_INFO_ATTR);
             if (cachedInfo!=null)
             {
                 keySize=cachedInfo.getKeySize();
                 certs=cachedInfo.getCerts();
                 idStr=cachedInfo.getIdStr();
             }
             else
             {
                 keySize=new Integer(ServletSSL.deduceKeyLength(cipherSuite));
                 certs=getCertChain(sslSession);
                 byte[] bytes = sslSession.getId();
                 idStr = TypeUtil.toHexString(bytes);
                 cachedInfo=new CachedInfo(keySize,certs,idStr);
                 sslSession.putValue(CACHED_INFO_ATTR,cachedInfo);
             }
 
             if (certs!=null)
                 request.setAttribute("javax.servlet.request.X509Certificate",certs);
 
             request.setAttribute("javax.servlet.request.cipher_suite",cipherSuite);
             request.setAttribute("javax.servlet.request.key_size",keySize);
             request.setAttribute("javax.servlet.request.ssl_session_id", idStr);
         }
         catch (Exception e)
         {
             Log.warn(Log.EXCEPTION,e);
         }
     }
 
     /* ------------------------------------------------------------ */
     public SslSelectChannelConnector()
     {
     }
 
     /**
      * 
      * @deprecated As of Java Servlet API 2.0, with no replacement.
      * 
      */
     public String[] getCipherSuites()
     {
         return getExcludeCipherSuites();
     }
 
     public String[] getExcludeCipherSuites()
     {
         return _excludeCipherSuites;
     }
 
     /**
      * 
      * @deprecated As of Java Servlet API 2.0, with no replacement.
      * 
      * 
      */
     public void setCipherSuites(String[] cipherSuites)
     {
         setExcludeCipherSuites(cipherSuites);
     }
 
     public void setExcludeCipherSuites(String[] cipherSuites)
     {
         this._excludeCipherSuites=cipherSuites;
     }
 
     /* ------------------------------------------------------------ */
     public void setPassword(String password)
     {
         _password=Password.getPassword(PASSWORD_PROPERTY,password,null);
     }
 
     /* ------------------------------------------------------------ */
     public void setTrustPassword(String password)
     {
         _trustPassword=Password.getPassword(PASSWORD_PROPERTY,password,null);
     }
 
     /* ------------------------------------------------------------ */
     public void setKeyPassword(String password)
     {
         _keyPassword=Password.getPassword(KEYPASSWORD_PROPERTY,password,null);
     }
 
     /* ------------------------------------------------------------ */
     public String getAlgorithm()
     {
         return (this._algorithm);
     }
 
     /* ------------------------------------------------------------ */
     public void setAlgorithm(String algorithm)
     {
         this._algorithm=algorithm;
     }
 
     /* ------------------------------------------------------------ */
     public String getProtocol()
     {
         return _protocol;
     }
 
     /* ------------------------------------------------------------ */
     public void setProtocol(String protocol)
     {
         _protocol=protocol;
     }
 
     /* ------------------------------------------------------------ */
     public void setKeystore(String keystore)
     {
         _keystore=keystore;
     }
 
     /* ------------------------------------------------------------ */
     public String getKeystore()
     {
         return _keystore;
     }
 
     /* ------------------------------------------------------------ */
     public String getKeystoreType()
     {
         return (_keystoreType);
     }
 
     /* ------------------------------------------------------------ */
     public boolean getNeedClientAuth()
     {
         return _needClientAuth;
     }
 
     /* ------------------------------------------------------------ */
     public boolean getWantClientAuth()
     {
         return _wantClientAuth;
     }
 
     /* ------------------------------------------------------------ */
     /**
      * Set the value of the needClientAuth property
      * 
      * @param needClientAuth
      *                true iff we require client certificate authentication.
      */
     public void setNeedClientAuth(boolean needClientAuth)
     {
         _needClientAuth=needClientAuth;
     }
 
     public void setWantClientAuth(boolean wantClientAuth)
     {
         _wantClientAuth=wantClientAuth;
     }
 
     /* ------------------------------------------------------------ */
     public void setKeystoreType(String keystoreType)
     {
         _keystoreType=keystoreType;
     }
 
     /* ------------------------------------------------------------ */
     public String getProvider()
     {
         return _provider;
     }
 
     public String getSecureRandomAlgorithm()
     {
         return (this._secureRandomAlgorithm);
     }
 
     /* ------------------------------------------------------------ */
     public String getSslKeyManagerFactoryAlgorithm()
     {
         return (this._sslKeyManagerFactoryAlgorithm);
     }
 
     /* ------------------------------------------------------------ */
     public String getSslTrustManagerFactoryAlgorithm()
     {
         return (this._sslTrustManagerFactoryAlgorithm);
     }
 
     /* ------------------------------------------------------------ */
     public String getTruststore()
     {
         return _truststore;
     }
 
     /* ------------------------------------------------------------ */
     public String getTruststoreType()
     {
         return _truststoreType;
     }
 
     /* ------------------------------------------------------------ */
     public void setProvider(String _provider)
     {
         this._provider=_provider;
     }
 
     /* ------------------------------------------------------------ */
     public void setSecureRandomAlgorithm(String algorithm)
     {
         this._secureRandomAlgorithm=algorithm;
     }
 
     /* ------------------------------------------------------------ */
     public void setSslKeyManagerFactoryAlgorithm(String algorithm)
     {
         this._sslKeyManagerFactoryAlgorithm=algorithm;
     }
 
     /* ------------------------------------------------------------ */
     public void setSslTrustManagerFactoryAlgorithm(String algorithm)
     {
         this._sslTrustManagerFactoryAlgorithm=algorithm;
     }
 
     public void setTruststore(String truststore)
     {
         _truststore=truststore;
     }
 
     public void setTruststoreType(String truststoreType)
     {
         _truststoreType=truststoreType;
     }
     
     public void setSslContext(SSLContext sslContext) {
 		this._context = sslContext;
 	}
     
     /* ------------------------------------------------------------ */
     /**
      * By default, we're confidential, given we speak SSL. But, if we've been
      * told about an confidential port, and said port is not our port, then
      * we're not. This allows separation of listeners providing INTEGRAL versus
      * CONFIDENTIAL constraints, such as one SSL listener configured to require
      * client certs providing CONFIDENTIAL, whereas another SSL listener not
      * requiring client certs providing mere INTEGRAL constraints.
      */
     public boolean isConfidential(Request request)
     {
         final int confidentialPort=getConfidentialPort();
         return confidentialPort==0||confidentialPort==request.getServerPort();
     }
 
     /* ------------------------------------------------------------ */
     /**
      * By default, we're integral, given we speak SSL. But, if we've been told
      * about an integral port, and said port is not our port, then we're not.
      * This allows separation of listeners providing INTEGRAL versus
      * CONFIDENTIAL constraints, such as one SSL listener configured to require
      * client certs providing CONFIDENTIAL, whereas another SSL listener not
      * requiring client certs providing mere INTEGRAL constraints.
      */
     public boolean isIntegral(Request request)
     {
         final int integralPort=getIntegralPort();
         return integralPort==0||integralPort==request.getServerPort();
     }
 
     /* ------------------------------------------------------------------------------- */
     protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey key) throws IOException
     {
         return new SslSelectChannelEndPoint(this,channel,selectSet,key,createSSLEngine());
     }
 
     /* ------------------------------------------------------------------------------- */
     protected Connection newConnection(SocketChannel channel, SelectChannelEndPoint endpoint)
     {
         HttpConnection connection=(HttpConnection)super.newConnection(channel,endpoint);
         ((HttpParser)connection.getParser()).setForceContentBuffer(true);
         return connection;
     }
 
     /* ------------------------------------------------------------ */
     protected SSLEngine createSSLEngine() throws IOException
     {
         SSLEngine engine=null;
         try
         {
             engine=_context.createSSLEngine();
             engine.setUseClientMode(false);
             
             if (_wantClientAuth)
                 engine.setWantClientAuth(_wantClientAuth);
             if (_needClientAuth)
                 engine.setNeedClientAuth(_needClientAuth);
             
             if (_excludeCipherSuites!=null&&_excludeCipherSuites.length>0)
             {
                 List<String> excludedCSList=Arrays.asList(_excludeCipherSuites);
                 String[] enabledCipherSuites=engine.getEnabledCipherSuites();
                 List<String> enabledCSList=new ArrayList<String>(Arrays.asList(enabledCipherSuites));
 
                 for (String cipherName : excludedCSList)
                 {
                     if (enabledCSList.contains(cipherName))
                     {
                         enabledCSList.remove(cipherName);
                     }
                 }
                 enabledCipherSuites=enabledCSList.toArray(new String[enabledCSList.size()]);
 
                 engine.setEnabledCipherSuites(enabledCipherSuites);
             }
 
         }
         catch (Exception e)
         {
             Log.warn("Error creating sslEngine -- closing this connector",e);
             close();
             throw new IllegalStateException(e);
         }
         return engine;
     }
 
    
     protected void doStart() throws Exception
     {
     	if (_context == null) {
            _context=createSSLContext();
     	}
         
         SSLEngine engine=createSSLEngine();
         SSLSession ssl_session=engine.getSession();
         
         setHeaderBufferSize(ssl_session.getApplicationBufferSize());
         setRequestBufferSize(ssl_session.getApplicationBufferSize());
         setResponseBufferSize(ssl_session.getApplicationBufferSize());
         
         super.doStart();
     }
 
     protected SSLContext createSSLContext() throws Exception
     {
         if (_truststore==null)
         {
             _truststore=_keystore;
             _truststoreType=_keystoreType;
         }
 
         InputStream keystoreInputStream = null;
 
         KeyManager[] keyManagers=null;
         KeyStore keyStore = null;
         try
         {
             if (_keystore!=null)
             {
                 keystoreInputStream=Resource.newResource(_keystore).getInputStream();
                 keyStore = KeyStore.getInstance(_keystoreType);
                 keyStore.load(keystoreInputStream,_password==null?null:_password.toString().toCharArray());
             }
         }
         finally
         {
             if (keystoreInputStream != null)
                 keystoreInputStream.close();
         }
 
         KeyManagerFactory keyManagerFactory=KeyManagerFactory.getInstance(_sslKeyManagerFactoryAlgorithm);
         keyManagerFactory.init(keyStore,_keyPassword==null?(_password==null?null:_password.toString().toCharArray()):_keyPassword.toString().toCharArray());
         keyManagers=keyManagerFactory.getKeyManagers();
 
 
         TrustManager[] trustManagers=null;
         InputStream truststoreInputStream = null;
         KeyStore trustStore = null;
         try
         {
             if (_truststore!=null)
             {
                 truststoreInputStream = Resource.newResource(_truststore).getInputStream();
                 trustStore=KeyStore.getInstance(_truststoreType);
                 trustStore.load(truststoreInputStream,_trustPassword==null?null:_trustPassword.toString().toCharArray());
             }
         }
         finally
         {
             if (truststoreInputStream != null)
                 truststoreInputStream.close();
         }
 
 
         TrustManagerFactory trustManagerFactory=TrustManagerFactory.getInstance(_sslTrustManagerFactoryAlgorithm);
         trustManagerFactory.init(trustStore);
         trustManagers=trustManagerFactory.getTrustManagers();
 
         SecureRandom secureRandom=_secureRandomAlgorithm==null?null:SecureRandom.getInstance(_secureRandomAlgorithm);
         SSLContext context=_provider==null?SSLContext.getInstance(_protocol):SSLContext.getInstance(_protocol,_provider);
         context.init(keyManagers,trustManagers,secureRandom);
         return context;
     }
 
     /**
      * Simple bundle of information that is cached in the SSLSession. Stores the
      * effective keySize and the client certificate chain.
      */
     private class CachedInfo
     {
         private X509Certificate[] _certs;
         private Integer _keySize;
         private String _idStr;
 
         CachedInfo(Integer keySize, X509Certificate[] certs,String idStr)
         {
             this._keySize=keySize;
             this._certs=certs;
             this._idStr=idStr;
         }
 
         X509Certificate[] getCerts()
         {
             return _certs;
         }
 
         Integer getKeySize()
         {
             return _keySize;
         }
         
         String getIdStr()
         {
             return _idStr;
         }
     }
 
 }