/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.sshd.client.auth;
import java.io.IOException;
import org.apache.sshd.client.UserInteraction;
import org.apache.sshd.client.session.ClientSessionImpl;
import org.apache.sshd.common.SshConstants;
import org.apache.sshd.common.SshConstants.Message;
import org.apache.sshd.common.util.Buffer;
/**
* Userauth with keyboard-interactive method.
*
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
* @author <a href="mailto:j.kapitza@schwarze-allianz.de">Jens Kapitza</a>
*/
public class UserAuthKeyboardInteractive extends AbstractUserAuth {
private final String password;
public UserAuthKeyboardInteractive(ClientSessionImpl session, String service, String username, String password) {
super(session, service, username);
this.password = password;
}
public Result next(Buffer buffer) throws IOException {
if (buffer == null) {
log.info("Send SSH_MSG_USERAUTH_REQUEST for password");
buffer = session.createBuffer(SshConstants.Message.SSH_MSG_USERAUTH_REQUEST, 0);
buffer.putString(username);
buffer.putString(service);
buffer.putString("keyboard-interactive");
buffer.putString("");
buffer.putString("");
session.writePacket(buffer);
return Result.Continued;
} else {
SshConstants.Message cmd = buffer.getCommand();
log.info("Received {}", cmd);
switch (cmd) {
case SSH_MSG_USERAUTH_INFO_REQUEST:
String name = buffer.getString();
String instruction = buffer.getString();
String language_tag = buffer.getString();
log.info("Received {} {} {}", new Object[]{name, instruction, language_tag});
int num = buffer.getInt();
String[] prompt = new String[num];
boolean[] echo = new boolean[num];
for (int i = 0; i < num; i++) {
prompt[i] = buffer.getString();
echo[i] = (buffer.getByte() != 0);
}
log.info("Promt: {}", prompt);
log.info("Echo: {}", echo);
String[] rep = null;
if (num == 0) {
rep = new String[0];
} else if (num == 1 && password != null && !echo[0] && prompt[0].toLowerCase().startsWith("password:")) {
rep = new String[] { password };
} else {
UserInteraction ui = session.getClientFactoryManager().getUserInteraction();
if (ui != null) {
String dest = username + "@" + session.getIoSession().getRemoteAddress().toString();
rep = ui.interactive(dest, name, instruction, prompt, echo);
}
}
if (rep == null) {
return Result.Failure;
}
buffer = session.createBuffer(Message.SSH_MSG_USERAUTH_INFO_RESPONSE, 0);
buffer.putInt(rep.length);
for (String r : rep) {
buffer.putString(r);
}
session.writePacket(buffer);
return Result.Continued;
case SSH_MSG_USERAUTH_SUCCESS:
return Result.Success;
case SSH_MSG_USERAUTH_FAILURE:
return Result.Failure;
default:
return Result.Continued;
}
}
}
}