Fix port usage and always try to add the generated key

[dumload.git] / src / com / jcraft / jsch / UserAuthGSSAPIWithMIC.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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package com.jcraft.jsch;

public class UserAuthGSSAPIWithMIC extends UserAuth {
  private static final int SSH_MSG_USERAUTH_GSSAPI_RESPONSE=         60;
  private static final int SSH_MSG_USERAUTH_GSSAPI_TOKEN=            61;
  private static final int SSH_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE=63;
  private static final int SSH_MSG_USERAUTH_GSSAPI_ERROR=            64;
  private static final int SSH_MSG_USERAUTH_GSSAPI_ERRTOK=           65;
  private static final int SSH_MSG_USERAUTH_GSSAPI_MIC=              66;

  private static final byte[][] supported_oid={
    // OID 1.2.840.113554.1.2.2 in DER
    {(byte)0x6,(byte)0x9,(byte)0x2a,(byte)0x86,(byte)0x48,
     (byte)0x86,(byte)0xf7,(byte)0x12,(byte)0x1,(byte)0x2,
     (byte)0x2}
  };

  private static final String[] supported_method={
    "gssapi-with-mic.krb5"
  };

  public boolean start(Session session)throws Exception{
    super.start(session);

    byte[] _username=Util.str2byte(username);

    packet.reset();

    // byte            SSH_MSG_USERAUTH_REQUEST(50)
    // string          user name(in ISO-10646 UTF-8 encoding)
    // string          service name(in US-ASCII)
    // string          "gssapi"(US-ASCII)
    // uint32          n, the number of OIDs client supports
    // string[n]       mechanism OIDS
    buf.putByte((byte)SSH_MSG_USERAUTH_REQUEST);
    buf.putString(_username);
    buf.putString(Util.str2byte("ssh-connection"));
    buf.putString(Util.str2byte("gssapi-with-mic"));
    buf.putInt(supported_oid.length);
    for(int i=0; i<supported_oid.length; i++){
      buf.putString(supported_oid[i]);
    }
    session.write(packet);

    String method=null;
    int command;
    while(true){
      buf=session.read(buf);
      command=buf.getCommand()&0xff;

      if(command==SSH_MSG_USERAUTH_FAILURE){
        return false;
      }
      
      if(command==SSH_MSG_USERAUTH_GSSAPI_RESPONSE){
        buf.getInt(); buf.getByte(); buf.getByte();
        byte[] message=buf.getString();

        for(int i=0; i<supported_oid.length; i++){
          if(Util.array_equals(message, supported_oid[i])){
            method=supported_method[i];
            break;
          }
        }

        if(method==null){
          return false;
        }

        break; // success
      }

      if(command==SSH_MSG_USERAUTH_BANNER){
        buf.getInt(); buf.getByte(); buf.getByte();
        byte[] _message=buf.getString();
        byte[] lang=buf.getString();
        String message=Util.byte2str(_message);
        if(userinfo!=null){
          userinfo.showMessage(message);
        }
        continue;
      }
      return false;
    }

    GSSContext context=null;
    try{
      Class c=Class.forName(session.getConfig(method));
      context=(GSSContext)(c.newInstance());
    }
    catch(Exception e){ 
      return false;
    }

    try{
      context.create(username, session.host);
    }
    catch(JSchException e){
      return false;
    }

    byte[] token=new byte[0];

    while(!context.isEstablished()){
      try{
        token=context.init(token, 0, token.length);
      }
      catch(JSchException e){
        // TODO
        // ERRTOK should be sent?
        // byte        SSH_MSG_USERAUTH_GSSAPI_ERRTOK
        // string      error token
        return false;
      }

      if(token!=null){
        packet.reset();
        buf.putByte((byte)SSH_MSG_USERAUTH_GSSAPI_TOKEN);
        buf.putString(token);
        session.write(packet);
      }

      if(!context.isEstablished()){
        buf=session.read(buf);
        command=buf.getCommand()&0xff;
        if(command==SSH_MSG_USERAUTH_GSSAPI_ERROR){
          // uint32    major_status
          // uint32    minor_status
          // string    message
          // string    language tag

          buf=session.read(buf);
          command=buf.getCommand()&0xff;
          //return false;
        }
        else if(command==SSH_MSG_USERAUTH_GSSAPI_ERRTOK){
          // string error token

          buf=session.read(buf);
          command=buf.getCommand()&0xff;
          //return false;
        }

        if(command==SSH_MSG_USERAUTH_FAILURE){
          return false;
        }

        buf.getInt(); buf.getByte(); buf.getByte();
        token=buf.getString();
      }
    }

    Buffer mbuf=new Buffer();
    // string    session identifier
    // byte      SSH_MSG_USERAUTH_REQUEST
    // string    user name
    // string    service
    // string    "gssapi-with-mic"
    mbuf.putString(session.getSessionId());
    mbuf.putByte((byte)SSH_MSG_USERAUTH_REQUEST);
    mbuf.putString(_username);
    mbuf.putString(Util.str2byte("ssh-connection"));
    mbuf.putString(Util.str2byte("gssapi-with-mic"));

    byte[] mic=context.getMIC(mbuf.buffer, 0, mbuf.getLength());

    if(mic==null){
      return false;
    }

    packet.reset();
    buf.putByte((byte)SSH_MSG_USERAUTH_GSSAPI_MIC);
    buf.putString(mic);
    session.write(packet);

    context.dispose();

    buf=session.read(buf);
    command=buf.getCommand()&0xff;

    if(command==SSH_MSG_USERAUTH_SUCCESS){
      return true;
    }
    else if(command==SSH_MSG_USERAUTH_FAILURE){
      buf.getInt(); buf.getByte(); buf.getByte(); 
      byte[] foo=buf.getString();
      int partial_success=buf.getByte();
      //System.err.println(new String(foo)+
      //		 " partial_success:"+(partial_success!=0));
      if(partial_success!=0){
        throw new JSchPartialAuthException(Util.byte2str(foo));
      }
    }
    return false;
  }
}