Exemplo n.º 1
0
  private boolean initialize(String user) throws IOException {
    if (initDone == false) {
      tm.registerMessageHandler(this, 0, 255);

      PacketServiceRequest sr = new PacketServiceRequest("ssh-userauth");
      tm.sendMessage(sr.getPayload());

      byte[] msg = getNextMessage();
      new PacketServiceAccept(msg, 0, msg.length);

      PacketUserauthRequestNone urn = new PacketUserauthRequestNone("ssh-connection", user);
      tm.sendMessage(urn.getPayload());

      msg = getNextMessage();

      initDone = true;

      if (msg[0] == Packets.SSH_MSG_USERAUTH_SUCCESS) {
        authenticated = true;
        tm.removeMessageHandler(this, 0, 255);
        return true;
      }

      if (msg[0] == Packets.SSH_MSG_USERAUTH_FAILURE) {
        PacketUserauthFailure puf = new PacketUserauthFailure(msg, 0, msg.length);

        remainingMethods = puf.getAuthThatCanContinue();
        isPartialSuccess = puf.isPartialSuccess();
        return false;
      }

      throw new IOException("Unexpected SSH message (type " + msg[0] + ")");
    }
    return authenticated;
  }
Exemplo n.º 2
0
  public boolean authenticatePassword(String user, String pass) throws IOException {
    try {
      initialize(user);

      if (methodPossible("password") == false)
        throw new IOException(
            "Authentication method password not supported by the server at this stage.");

      PacketUserauthRequestPassword ua =
          new PacketUserauthRequestPassword("ssh-connection", user, pass);
      tm.sendMessage(ua.getPayload());

      byte[] ar = getNextMessage();

      if (ar[0] == Packets.SSH_MSG_USERAUTH_SUCCESS) {
        authenticated = true;
        tm.removeMessageHandler(this, 0, 255);
        return true;
      }

      if (ar[0] == Packets.SSH_MSG_USERAUTH_FAILURE) {
        PacketUserauthFailure puf = new PacketUserauthFailure(ar, 0, ar.length);

        remainingMethods = puf.getAuthThatCanContinue();
        isPartialSuccess = puf.isPartialSuccess();

        return false;
      }

      throw new IOException("Unexpected SSH message (type " + ar[0] + ")");

    } catch (IOException e) {
      tm.close(e, false);
      throw (IOException) new IOException("Password authentication failed.").initCause(e);
    }
  }
Exemplo n.º 3
0
  public boolean authenticateInteractive(String user, String[] submethods, InteractiveCallback cb)
      throws IOException {
    try {
      initialize(user);

      if (methodPossible("keyboard-interactive") == false)
        throw new IOException(
            "Authentication method keyboard-interactive not supported by the server at this stage.");

      if (submethods == null) submethods = new String[0];

      PacketUserauthRequestInteractive ua =
          new PacketUserauthRequestInteractive("ssh-connection", user, submethods);

      tm.sendMessage(ua.getPayload());

      while (true) {
        byte[] ar = getNextMessage();

        if (ar[0] == Packets.SSH_MSG_USERAUTH_SUCCESS) {
          authenticated = true;
          tm.removeMessageHandler(this, 0, 255);
          return true;
        }

        if (ar[0] == Packets.SSH_MSG_USERAUTH_FAILURE) {
          PacketUserauthFailure puf = new PacketUserauthFailure(ar, 0, ar.length);

          remainingMethods = puf.getAuthThatCanContinue();
          isPartialSuccess = puf.isPartialSuccess();

          return false;
        }

        if (ar[0] == Packets.SSH_MSG_USERAUTH_INFO_REQUEST) {
          PacketUserauthInfoRequest pui = new PacketUserauthInfoRequest(ar, 0, ar.length);

          String[] responses;

          try {
            responses =
                cb.replyToChallenge(
                    pui.getName(),
                    pui.getInstruction(),
                    pui.getNumPrompts(),
                    pui.getPrompt(),
                    pui.getEcho());
          } catch (Exception e) {
            throw (IOException) new IOException("Exception in callback.").initCause(e);
          }

          if (responses == null) throw new IOException("Your callback may not return NULL!");

          PacketUserauthInfoResponse puir = new PacketUserauthInfoResponse(responses);
          tm.sendMessage(puir.getPayload());

          continue;
        }

        throw new IOException("Unexpected SSH message (type " + ar[0] + ")");
      }
    } catch (IOException e) {
      tm.close(e, false);
      throw (IOException)
          new IOException("Keyboard-interactive authentication failed.").initCause(e);
    }
  }
Exemplo n.º 4
0
  public boolean authenticatePublicKey(
      String user, char[] PEMPrivateKey, String password, SecureRandom rnd) throws IOException {
    try {
      initialize(user);

      if (methodPossible("publickey") == false)
        throw new IOException(
            "Authentication method publickey not supported by the server at this stage.");

      Object key = PEMDecoder.decode(PEMPrivateKey, password);

      if (key instanceof DSAPrivateKey) {
        DSAPrivateKey pk = (DSAPrivateKey) key;

        byte[] pk_enc = DSASHA1Verify.encodeSSHDSAPublicKey(pk.getPublicKey());

        TypesWriter tw = new TypesWriter();

        byte[] H = tm.getSessionIdentifier();

        tw.writeString(H, 0, H.length);
        tw.writeByte(Packets.SSH_MSG_USERAUTH_REQUEST);
        tw.writeString(user);
        tw.writeString("ssh-connection");
        tw.writeString("publickey");
        tw.writeBoolean(true);
        tw.writeString("ssh-dss");
        tw.writeString(pk_enc, 0, pk_enc.length);

        byte[] msg = tw.getBytes();

        DSASignature ds = DSASHA1Verify.generateSignature(msg, pk, rnd);

        byte[] ds_enc = DSASHA1Verify.encodeSSHDSASignature(ds);

        PacketUserauthRequestPublicKey ua =
            new PacketUserauthRequestPublicKey("ssh-connection", user, "ssh-dss", pk_enc, ds_enc);
        tm.sendMessage(ua.getPayload());
      } else if (key instanceof RSAPrivateKey) {
        RSAPrivateKey pk = (RSAPrivateKey) key;

        byte[] pk_enc = RSASHA1Verify.encodeSSHRSAPublicKey(pk.getPublicKey());

        TypesWriter tw = new TypesWriter();
        {
          byte[] H = tm.getSessionIdentifier();

          tw.writeString(H, 0, H.length);
          tw.writeByte(Packets.SSH_MSG_USERAUTH_REQUEST);
          tw.writeString(user);
          tw.writeString("ssh-connection");
          tw.writeString("publickey");
          tw.writeBoolean(true);
          tw.writeString("ssh-rsa");
          tw.writeString(pk_enc, 0, pk_enc.length);
        }

        byte[] msg = tw.getBytes();

        RSASignature ds = RSASHA1Verify.generateSignature(msg, pk);

        byte[] rsa_sig_enc = RSASHA1Verify.encodeSSHRSASignature(ds);

        PacketUserauthRequestPublicKey ua =
            new PacketUserauthRequestPublicKey(
                "ssh-connection", user, "ssh-rsa", pk_enc, rsa_sig_enc);
        tm.sendMessage(ua.getPayload());
      } else {
        throw new IOException("Unknown private key type returned by the PEM decoder.");
      }

      byte[] ar = getNextMessage();

      if (ar[0] == Packets.SSH_MSG_USERAUTH_SUCCESS) {
        authenticated = true;
        tm.removeMessageHandler(this, 0, 255);
        return true;
      }

      if (ar[0] == Packets.SSH_MSG_USERAUTH_FAILURE) {
        PacketUserauthFailure puf = new PacketUserauthFailure(ar, 0, ar.length);

        remainingMethods = puf.getAuthThatCanContinue();
        isPartialSuccess = puf.isPartialSuccess();

        return false;
      }

      throw new IOException("Unexpected SSH message (type " + ar[0] + ")");

    } catch (IOException e) {
      tm.close(e, false);
      throw (IOException) new IOException("Publickey authentication failed.").initCause(e);
    }
  }