Fix port usage and always try to add the generated key

[dumload.git] / src / com / jcraft / jsch / ChannelAgentForwarding.java

/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/*
Copyright (c) 2006-2010 ymnk, JCraft,Inc. All rights reserved.

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  1. Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.

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     the documentation and/or other materials provided with the distribution.

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     derived from this software without specific prior written permission.

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*/

package com.jcraft.jsch;

import java.net.*;
import java.util.Vector;

class ChannelAgentForwarding extends Channel{

  static private final int LOCAL_WINDOW_SIZE_MAX=0x20000;
  static private final int LOCAL_MAXIMUM_PACKET_SIZE=0x4000;

  private final int SSH2_AGENTC_REQUEST_IDENTITIES=11;
  private final int SSH2_AGENT_IDENTITIES_ANSWER=12;
  private final int SSH2_AGENTC_SIGN_REQUEST=13;
  private final int SSH2_AGENT_SIGN_RESPONSE=14;
  private final int SSH2_AGENTC_ADD_IDENTITY=17;
  private final int SSH2_AGENTC_REMOVE_IDENTITY=18;
  private final int SSH2_AGENTC_REMOVE_ALL_IDENTITIES=19;
  private final int SSH2_AGENT_FAILURE=30;

  boolean init=true;

  private Buffer rbuf=null;
  private Buffer wbuf=null;
  private Packet packet=null;
  private Buffer mbuf=null;

  ChannelAgentForwarding(){
    super();

    setLocalWindowSizeMax(LOCAL_WINDOW_SIZE_MAX);
    setLocalWindowSize(LOCAL_WINDOW_SIZE_MAX);
    setLocalPacketSize(LOCAL_MAXIMUM_PACKET_SIZE);

    type=Util.str2byte("auth-agent@openssh.com");
    rbuf=new Buffer();
    rbuf.reset();
    //wbuf=new Buffer(rmpsize);
    //packet=new Packet(wbuf);
    mbuf=new Buffer();
    connected=true;
  }

  public void run(){
    try{
      sendOpenConfirmation();
    }
    catch(Exception e){
      close=true;
      disconnect();
    }
  }

  void write(byte[] foo, int s, int l) throws java.io.IOException {

    if(packet==null){
      wbuf=new Buffer(rmpsize);
      packet=new Packet(wbuf);
    }

    rbuf.shift();
    if(rbuf.buffer.length<rbuf.index+l){
      byte[] newbuf=new byte[rbuf.s+l];
      System.arraycopy(rbuf.buffer, 0, newbuf, 0, rbuf.buffer.length);
      rbuf.buffer=newbuf;
    }

    rbuf.putByte(foo, s, l);

    int mlen=rbuf.getInt();
    if(mlen>rbuf.getLength()){
      rbuf.s-=4;
      return;
    }

    int typ=rbuf.getByte();

    Session _session=null;
    try{
      _session=getSession();
    }
    catch(JSchException e){
      throw new java.io.IOException(e.toString());
    }

    Vector identities=_session.jsch.identities;
    UserInfo userinfo=_session.getUserInfo();

    if(typ==SSH2_AGENTC_REQUEST_IDENTITIES){ 
      mbuf.reset();
      mbuf.putByte((byte)SSH2_AGENT_IDENTITIES_ANSWER);
      synchronized(identities){
        int count=0;
        for(int i=0; i<identities.size(); i++){
          Identity identity=(Identity)(identities.elementAt(i));
          if(identity.getPublicKeyBlob()!=null)
            count++;
        }
        mbuf.putInt(count);
        for(int i=0; i<identities.size(); i++){
          Identity identity=(Identity)(identities.elementAt(i));
          byte[] pubkeyblob=identity.getPublicKeyBlob();
          if(pubkeyblob==null)
            continue;
          mbuf.putString(pubkeyblob);
          mbuf.putString(Util.empty);
        }
      }
      byte[] bar=new byte[mbuf.getLength()];
      mbuf.getByte(bar);

      send(bar);
    }
    else if(typ==SSH2_AGENTC_SIGN_REQUEST){
      byte[] blob=rbuf.getString();
      byte[] data=rbuf.getString();
      int flags=rbuf.getInt();

//      if((flags & 1)!=0){ //SSH_AGENT_OLD_SIGNATURE // old OpenSSH 2.0, 2.1
//        datafellows = SSH_BUG_SIGBLOB;
//      }

      Identity identity=null;
      synchronized(identities){
        for(int i=0; i<identities.size(); i++){
          Identity _identity=(Identity)(identities.elementAt(i));
          if(_identity.getPublicKeyBlob()==null)
            continue;
          if(!Util.array_equals(blob, _identity.getPublicKeyBlob())){
            continue;
          }
          if(_identity.isEncrypted()){
            if(userinfo==null)
              continue;
            while(_identity.isEncrypted()){
              if(!userinfo.promptPassphrase("Passphrase for "+_identity.getName())){
                break;
              }

              String _passphrase=userinfo.getPassphrase();
              if(_passphrase==null){
                break;
              }

              byte[] passphrase=Util.str2byte(_passphrase);
              try{
                if(_identity.setPassphrase(passphrase)){
                  break;
                }
              }
              catch(JSchException e){
                break;
              }
            }
          }

          if(!_identity.isEncrypted()){
            identity=_identity;
            break;
          }
        }
      }

      byte[] signature=null;

      if(identity!=null){
        signature=identity.getSignature(data);
      }

      mbuf.reset();
      if(signature==null){
        mbuf.putByte((byte)SSH2_AGENT_FAILURE);
      }
      else{
        mbuf.putByte((byte)SSH2_AGENT_SIGN_RESPONSE);
        mbuf.putString(signature);
      }

      byte[] bar=new byte[mbuf.getLength()];
      mbuf.getByte(bar);

      send(bar);
    }
  }

  private void send(byte[] message){
    packet.reset();
    wbuf.putByte((byte)Session.SSH_MSG_CHANNEL_DATA);
    wbuf.putInt(recipient);
    wbuf.putInt(4+message.length);
    wbuf.putString(message);

    try{
      getSession().write(packet, this, 4+message.length);
    }
    catch(Exception e){
    }
  }
}