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/*
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 * Licensed to the Apache Software Foundation (ASF) under one
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 * or more contributor license agreements.  See the NOTICE file
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 * distributed with this work for additional information
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 * regarding copyright ownership.  The ASF licenses this file
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 * to you under the Apache License, Version 2.0 (the
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 * "License"); you may not use this file except in compliance
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 * with the License.  You may obtain a copy of the License at
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 *
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 *   http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing,
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 * software distributed under the License is distributed on an
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 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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 * KIND, either express or implied.  See the License for the
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 * specific language governing permissions and limitations
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 * under the License.
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 */
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package org.apache.sshd.server.auth;
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import org.apache.sshd.common.NamedFactory;
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import org.apache.sshd.common.SshConstants;
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import org.apache.sshd.common.SshException;
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import org.apache.sshd.common.util.Buffer;
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import org.apache.sshd.server.PasswordAuthenticator;
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import org.apache.sshd.server.UserAuth;
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import org.apache.sshd.server.session.ServerSession;
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/**
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 * TODO Add javadoc
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 *
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 * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
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 */
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public class UserAuthKeyboardInteractive extends AbstractUserAuth {
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    public static class Factory implements NamedFactory<UserAuth> {
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        public String getName() {
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            return "keyboard-interactive";
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        }
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        public UserAuth create() {
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            return new UserAuthKeyboardInteractive();
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        }
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    }
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    @Override
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    protected Boolean doAuth(Buffer buffer, boolean init) throws Exception {
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        if (init) {
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            // Prompt for password
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            buffer = session.createBuffer(SshConstants.SSH_MSG_USERAUTH_INFO_REQUEST);
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            buffer.putString("Password authentication");
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            buffer.putString("");
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            buffer.putString("en-US");
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            buffer.putInt(1);
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            buffer.putString("Password: ");
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            buffer.putBoolean(false);
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            session.writePacket(buffer);
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            return null;
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        } else {
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            byte cmd = buffer.getByte();
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            if (cmd != SshConstants.SSH_MSG_USERAUTH_INFO_RESPONSE) {
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                throw new SshException("Received unexpected message: " + cmd);
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            }
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            int num = buffer.getInt();
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            if (num != 1) {
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                throw new SshException("Expected 1 response from user but received " + num);
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            }
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            String password = buffer.getString();
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            return checkPassword(session, username, password);
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        }
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    }
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    private boolean checkPassword(ServerSession session, String username, String password) throws Exception {
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        PasswordAuthenticator auth = session.getFactoryManager().getPasswordAuthenticator();
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        if (auth != null) {
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            return auth.authenticate(username, password, session);
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        }
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        throw new Exception("No PasswordAuthenticator configured");
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    }
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}