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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
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 * 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
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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="">Apache MINA SSHD Project</a>

public class UserAuthPassword extends AbstractUserAuth {

    public static class Factory implements NamedFactory<UserAuth> {
        public String getName() {
            return "password";
        public UserAuth create() {
            return new UserAuthPassword();

    public Boolean doAuth(Buffer buffer, boolean init) throws Exception {
        if (!init) {
            throw new IllegalStateException();
        boolean newPassword = buffer.getBoolean();
        if (newPassword) {
            throw new IllegalStateException("Password changes are not supported");
        String password = buffer.getString();
        return checkPassword(session, username, password);

    private boolean checkPassword(ServerSession session, String username, String password) throws Exception {
        PasswordAuthenticator auth = session.getFactoryManager().getPasswordAuthenticator();
        if (auth != null) {
            return auth.authenticate(username, password, session);
        throw new Exception("No PasswordAuthenticator configured");