Examples of ch.ethz.ssh2.packets.TypesReader

ch.ethz.ssh2.packets.TypesReader
TypesReader. @author Christian Plattner, plattner@inf.ethz.ch @version $Id: TypesReader.java,v 1.6 2006/08/31 20:04:29 cplattne Exp $

    return tw.getBytes();
  }


  public static DSASignature decodeSSHDSASignature(byte[] sig) throws IOException
  {
    TypesReader tr = new TypesReader(sig);


    String sig_format = tr.readString();


    if (sig_format.equals("ssh-dss") == false)
      throw new IOException("Peer sent wrong signature format");


    byte[] rsArray = tr.readByteString();


    if (rsArray.length != 40)
      throw new IOException("Peer sent corrupt signature");


    if (tr.remain() != 0)
      throw new IOException("Padding in DSA signature!");


    /* Remember, s and r are unsigned ints. */


    byte[] tmp = new byte[20];

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      log.log(80, "Got SSH_MSG_CHANNEL_WINDOW_ADJUST (channel " + id + ", " + windowChange + ")");
  }


  public void msgChannelOpen(byte[] msg, int msglen) throws IOException
  {
    TypesReader tr = new TypesReader(msg, 0, msglen);


    tr.readByte(); // skip packet type
    String channelType = tr.readString();
    int remoteID = tr.readUINT32(); /* sender channel */
    int remoteWindow = tr.readUINT32(); /* initial window size */
    int remoteMaxPacketSize = tr.readUINT32(); /* maximum packet size */


    if ("x11".equals(channelType))
    {
      synchronized (x11_magic_cookies)
      {
        /* If we did not request X11 forwarding, then simply ignore this bogus request. */


        if (x11_magic_cookies.size() == 0)
        {
          PacketChannelOpenFailure pcof = new PacketChannelOpenFailure(remoteID,
              Packets.SSH_OPEN_ADMINISTRATIVELY_PROHIBITED, "X11 forwarding not activated", "");


          tm.sendAsynchronousMessage(pcof.getPayload());


          if (log.isEnabled())
            log.log(20, "Unexpected X11 request, denying it!");


          return;
        }
      }


      String remoteOriginatorAddress = tr.readString();
      int remoteOriginatorPort = tr.readUINT32();


      Channel c = new Channel(this);


      synchronized (c)
      {
        c.remoteID = remoteID;
        c.remoteWindow = remoteWindow & 0xFFFFffffL; /* properly convert UINT32 to long */
        c.remoteMaxPacketSize = remoteMaxPacketSize;
        c.localID = addChannel(c);
      }


      /*
       * The open confirmation message will be sent from another thread
       */


      RemoteX11AcceptThread rxat = new RemoteX11AcceptThread(c, remoteOriginatorAddress, remoteOriginatorPort);
      rxat.setDaemon(true);
      rxat.start();


      return;
    }


    if ("forwarded-tcpip".equals(channelType))
    {
      String remoteConnectedAddress = tr.readString(); /* address that was connected */
      int remoteConnectedPort = tr.readUINT32(); /* port that was connected */
      String remoteOriginatorAddress = tr.readString(); /* originator IP address */
      int remoteOriginatorPort = tr.readUINT32(); /* originator port */


      RemoteForwardingData rfd = null;


      synchronized (remoteForwardings)
      {

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      log.log(20, "The peer tried to open an unsupported channel type (" + channelType + ")");
  }


  public void msgChannelRequest(byte[] msg, int msglen) throws IOException
  {
    TypesReader tr = new TypesReader(msg, 0, msglen);


    tr.readByte(); // skip packet type
    int id = tr.readUINT32();


    Channel c = getChannel(id);


    if (c == null)
      throw new IOException("Unexpected SSH_MSG_CHANNEL_REQUEST message for non-existent channel " + id);


    String type = tr.readString("US-ASCII");
    boolean wantReply = tr.readBoolean();


    if (log.isEnabled())
      log.log(80, "Got SSH_MSG_CHANNEL_REQUEST (channel " + id + ", '" + type + "')");


    if (type.equals("exit-status"))
    {
      if (wantReply != false)
        throw new IOException("Badly formatted SSH_MSG_CHANNEL_REQUEST message, 'want reply' is true");


      int exit_status = tr.readUINT32();


      if (tr.remain() != 0)
        throw new IOException("Badly formatted SSH_MSG_CHANNEL_REQUEST message");


      synchronized (c)
      {
        c.exit_status = new Integer(exit_status);
        c.notifyAll();
      }


      if (log.isEnabled())
        log.log(50, "Got EXIT STATUS (channel " + id + ", status " + exit_status + ")");


      return;
    }


    if (type.equals("exit-signal"))
    {
      if (wantReply != false)
        throw new IOException("Badly formatted SSH_MSG_CHANNEL_REQUEST message, 'want reply' is true");


      String signame = tr.readString("US-ASCII");
      tr.readBoolean();
      tr.readString();
      tr.readString();


      if (tr.remain() != 0)
        throw new IOException("Badly formatted SSH_MSG_CHANNEL_REQUEST message");


      synchronized (c)
      {
        c.exit_signal = signame;

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{
  private static final Logger log = Logger.getLogger(RSASHA1Verify.class);


  public static RSAPublicKey decodeSSHRSAPublicKey(byte[] key) throws IOException
  {
    TypesReader tr = new TypesReader(key);


    String key_format = tr.readString();


    if (key_format.equals("ssh-rsa") == false)
      throw new IllegalArgumentException("This is not a ssh-rsa public key");


    BigInteger e = tr.readMPINT();
    BigInteger n = tr.readMPINT();


    if (tr.remain() != 0)
      throw new IOException("Padding in RSA public key!");


    return new RSAPublicKey(e, n);
  }

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    return tw.getBytes();
  }


  public static RSASignature decodeSSHRSASignature(byte[] sig) throws IOException
  {
    TypesReader tr = new TypesReader(sig);


    String sig_format = tr.readString();


    if (sig_format.equals("ssh-rsa") == false)
      throw new IOException("Peer sent wrong signature format");


    /* S is NOT an MPINT. "The value for 'rsa_signature_blob' is encoded as a string
     * containing s (which is an integer, without lengths or padding, unsigned and in
     * network byte order)." See also below.
     */


    byte[] s = tr.readByteString();


    if (s.length == 0)
      throw new IOException("Error in RSA signature, S is empty.");


    if (log.isEnabled())
    {
      log.log(80, "Decoding ssh-rsa signature string (length: " + s.length + ")");
    }


    if (tr.remain() != 0)
      throw new IOException("Padding in RSA signature!");


    return new RSASignature(new BigInteger(1, s));
  }

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      if (type == Packets.SSH_MSG_DEBUG)
      {
        if (log.isEnabled())
        {
          TypesReader tr = new TypesReader(msg, 0, msglen);
          tr.readByte();
          tr.readBoolean();
          StringBuffer debugMessageBuffer = new StringBuffer();
          debugMessageBuffer.append(tr.readString("UTF-8"));


          for (int i = 0; i < debugMessageBuffer.length(); i++)
          {
            char c = debugMessageBuffer.charAt(i);


            if ((c >= 32) && (c <= 126))
              continue;
            debugMessageBuffer.setCharAt(i, '\uFFFD');
          }


          log.log(50, "DEBUG Message from remote: '" + debugMessageBuffer.toString() + "'");
        }
        continue;
      }


      if (type == Packets.SSH_MSG_UNIMPLEMENTED)
      {
        throw new IOException("Peer sent UNIMPLEMENTED message, that should not happen.");
      }


      if (type == Packets.SSH_MSG_DISCONNECT)
      {
        TypesReader tr = new TypesReader(msg, 0, msglen);
        tr.readByte();
        int reason_code = tr.readUINT32();
        StringBuffer reasonBuffer = new StringBuffer();
        reasonBuffer.append(tr.readString("UTF-8"));


        /*
         * Do not get fooled by servers that send abnormal long error
         * messages
         */

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      log.log(80, "Got SSH_MSG_CHANNEL_WINDOW_ADJUST (channel " + id + ", " + windowChange + ")");
  }


  public void msgChannelOpen(byte[] msg, int msglen) throws IOException
  {
    TypesReader tr = new TypesReader(msg, 0, msglen);


    tr.readByte(); // skip packet type
    String channelType = tr.readString();
    int remoteID = tr.readUINT32(); /* sender channel */
    int remoteWindow = tr.readUINT32(); /* initial window size */
    int remoteMaxPacketSize = tr.readUINT32(); /* maximum packet size */


    if ("x11".equals(channelType))
    {
      synchronized (x11_magic_cookies)
      {
        /* If we did not request X11 forwarding, then simply ignore this bogus request. */


        if (x11_magic_cookies.size() == 0)
        {
          PacketChannelOpenFailure pcof = new PacketChannelOpenFailure(remoteID,
              Packets.SSH_OPEN_ADMINISTRATIVELY_PROHIBITED, "X11 forwarding not activated", "");


          tm.sendAsynchronousMessage(pcof.getPayload());


          if (log.isEnabled())
            log.log(20, "Unexpected X11 request, denying it!");


          return;
        }
      }


      String remoteOriginatorAddress = tr.readString();
      int remoteOriginatorPort = tr.readUINT32();


      Channel c = new Channel(this);


      synchronized (c)
      {
        c.remoteID = remoteID;
        c.remoteWindow = remoteWindow & 0xFFFFffffL; /* properly convert UINT32 to long */
        c.remoteMaxPacketSize = remoteMaxPacketSize;
        c.localID = addChannel(c);
      }


      /*
       * The open confirmation message will be sent from another thread
       */


      RemoteX11AcceptThread rxat = new RemoteX11AcceptThread(c, remoteOriginatorAddress, remoteOriginatorPort);
      rxat.setDaemon(true);
      rxat.start();


      return;
    }


    if ("forwarded-tcpip".equals(channelType))
    {
      String remoteConnectedAddress = tr.readString(); /* address that was connected */
      int remoteConnectedPort = tr.readUINT32(); /* port that was connected */
      String remoteOriginatorAddress = tr.readString(); /* originator IP address */
      int remoteOriginatorPort = tr.readUINT32(); /* originator port */


      RemoteForwardingData rfd = null;


      synchronized (remoteForwardings)
      {

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      log.log(20, "The peer tried to open an unsupported channel type (" + channelType + ")");
  }


  public void msgChannelRequest(byte[] msg, int msglen) throws IOException
  {
    TypesReader tr = new TypesReader(msg, 0, msglen);


    tr.readByte(); // skip packet type
    int id = tr.readUINT32();


    Channel c = getChannel(id);


    if (c == null)
      throw new IOException("Unexpected SSH_MSG_CHANNEL_REQUEST message for non-existent channel " + id);


    String type = tr.readString("US-ASCII");
    boolean wantReply = tr.readBoolean();


    if (log.isEnabled())
      log.log(80, "Got SSH_MSG_CHANNEL_REQUEST (channel " + id + ", '" + type + "')");


    if (type.equals("exit-status"))
    {
      if (wantReply != false)
        throw new IOException("Badly formatted SSH_MSG_CHANNEL_REQUEST message, 'want reply' is true");


      int exit_status = tr.readUINT32();


      if (tr.remain() != 0)
        throw new IOException("Badly formatted SSH_MSG_CHANNEL_REQUEST message");


      synchronized (c)
      {
        c.exit_status = new Integer(exit_status);
        c.notifyAll();
      }


      if (log.isEnabled())
        log.log(50, "Got EXIT STATUS (channel " + id + ", status " + exit_status + ")");


      return;
    }


    if (type.equals("exit-signal"))
    {
      if (wantReply != false)
        throw new IOException("Badly formatted SSH_MSG_CHANNEL_REQUEST message, 'want reply' is true");


      String signame = tr.readString("US-ASCII");
      tr.readBoolean();
      tr.readString();
      tr.readString();


      if (tr.remain() != 0)
        throw new IOException("Badly formatted SSH_MSG_CHANNEL_REQUEST message");


      synchronized (c)
      {
        c.exit_signal = signame;

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  public void msgGlobalRequest(byte[] msg, int msglen) throws IOException
  {
    /* Currently we do not support any kind of global request */


    TypesReader tr = new TypesReader(msg, 0, msglen);


    tr.readByte(); // skip packet type
    String requestName = tr.readString();
    boolean wantReply = tr.readBoolean();


    if (wantReply)
    {
      byte[] reply_failure = new byte[1];
      reply_failure[0] = Packets.SSH_MSG_REQUEST_FAILURE;

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      if (type == Packets.SSH_MSG_DEBUG)
      {
        if (log.isEnabled())
        {
          TypesReader tr = new TypesReader(msg, 0, msglen);
          tr.readByte();
          tr.readBoolean();
          StringBuffer debugMessageBuffer = new StringBuffer();
          debugMessageBuffer.append(tr.readString("UTF-8"));


          for (int i = 0; i < debugMessageBuffer.length(); i++)
          {
            char c = debugMessageBuffer.charAt(i);


            if ((c >= 32) && (c <= 126))
              continue;
            debugMessageBuffer.setCharAt(i, '\uFFFD');
          }


          log.log(50, "DEBUG Message from remote: '" + debugMessageBuffer.toString() + "'");
        }
        continue;
      }


      if (type == Packets.SSH_MSG_UNIMPLEMENTED)
      {
        throw new IOException("Peer sent UNIMPLEMENTED message, that should not happen.");
      }


      if (type == Packets.SSH_MSG_DISCONNECT)
      {
        TypesReader tr = new TypesReader(msg, 0, msglen);
        tr.readByte();
        int reason_code = tr.readUINT32();
        StringBuffer reasonBuffer = new StringBuffer();
        reasonBuffer.append(tr.readString("UTF-8"));


        /*
         * Do not get fooled by servers that send abnormal long error
         * messages
         */

View Full Code Here

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