/*
* 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.server.auth;
import org.apache.sshd.common.NamedFactory;
import org.apache.sshd.common.SshConstants;
import org.apache.sshd.common.SshException;
import org.apache.sshd.common.util.Buffer;
import org.apache.sshd.server.PasswordAuthenticator;
import org.apache.sshd.server.UserAuth;
import org.apache.sshd.server.session.ServerSession;
/**
* TODO Add javadoc
*
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public class UserAuthKeyboardInteractive extends AbstractUserAuth {
public static class Factory implements NamedFactory<UserAuth> {
public String getName() {
return "keyboard-interactive";
}
public UserAuth create() {
return new UserAuthKeyboardInteractive();
}
}
@Override
protected Boolean doAuth(Buffer buffer, boolean init) throws Exception {
if (!"ssh-connection".equals(service)) {
throw new SshException(SshConstants.SSH2_DISCONNECT_PROTOCOL_ERROR, "Unsupported service '" + service + "'");
}
if (init) {
// Prompt for password
buffer = session.createBuffer(SshConstants.Message.SSH_MSG_USERAUTH_INFO_REQUEST, 0);
buffer.putString("Password authentication");
buffer.putString("");
buffer.putString("en-US");
buffer.putInt(1);
buffer.putString("Password: ");
buffer.putBoolean(false);
session.writePacket(buffer);
return null;
} else {
SshConstants.Message cmd = buffer.getCommand();
if (cmd != SshConstants.Message.SSH_MSG_USERAUTH_INFO_RESPONSE) {
throw new SshException("Received unexepected message: " + cmd);
}
int num = buffer.getInt();
if (num != 1) {
throw new SshException("Expected 1 response from user but received " + num);
}
String password = buffer.getString();
return checkPassword(session, username, password);
}
}
private boolean checkPassword(ServerSession session, String username, String password) throws Exception {
PasswordAuthenticator auth = session.getServerFactoryManager().getPasswordAuthenticator();
if (auth != null) {
return auth.authenticate(username, password, session);
}
throw new Exception("No PasswordAuthenticator configured");
}
}