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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;
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import org.apache.sshd.server.session.ServerSession;
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/**
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 * The <code>PasswordAuthenticator</code> is used to authenticate
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 * users based on a password.
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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 interface PasswordAuthenticator {
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    /**
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     * Check the validity of a password.
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     * This method should return null if the authentication fails.
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     *
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     * @param username the username
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     * @param password the password
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     * @param session the server session
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     * @return a boolean indicating if authentication succeeded or not
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     */
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    boolean authenticate(String username, String password, ServerSession session);
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}