/*
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* Copyright 2014 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* 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, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.gitblit.transport.ssh;
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import java.security.PublicKey;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Locale;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import org.apache.sshd.common.Session;
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import org.apache.sshd.common.SessionListener;
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import org.apache.sshd.server.PublickeyAuthenticator;
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import org.apache.sshd.server.session.ServerSession;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.gitblit.manager.IAuthenticationManager;
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import com.gitblit.models.UserModel;
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import com.google.common.base.Preconditions;
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/**
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*
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* @author Eric Myrhe
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*
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*/
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public class CachingPublicKeyAuthenticator implements PublickeyAuthenticator,
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SessionListener {
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protected final Logger log = LoggerFactory.getLogger(getClass());
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protected final IPublicKeyManager keyManager;
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protected final IAuthenticationManager authManager;
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private final Map<ServerSession, Map<PublicKey, Boolean>> cache =
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new ConcurrentHashMap<ServerSession, Map<PublicKey, Boolean>>();
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public CachingPublicKeyAuthenticator(IPublicKeyManager keyManager,
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IAuthenticationManager authManager) {
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this.keyManager = keyManager;
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this.authManager = authManager;
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}
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@Override
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public boolean authenticate(String username, PublicKey key,
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ServerSession session) {
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Map<PublicKey, Boolean> map = cache.get(session);
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if (map == null) {
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map = new HashMap<PublicKey, Boolean>();
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cache.put(session, map);
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session.addListener(this);
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}
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if (map.containsKey(key)) {
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return map.get(key);
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}
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boolean result = doAuthenticate(username, key, session);
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map.put(key, result);
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return result;
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}
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protected boolean doAuthenticate(String username, PublicKey suppliedKey,
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ServerSession session) {
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SshDaemonClient client = session.getAttribute(SshDaemonClient.KEY);
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Preconditions.checkState(client.getUser() == null);
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username = username.toLowerCase(Locale.US);
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List<PublicKey> keys = keyManager.getKeys(username);
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if (keys == null || keys.isEmpty()) {
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log.info("{} has not added any public keys for ssh authentication",
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username);
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return false;
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}
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for (PublicKey key : keys) {
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if (key.equals(suppliedKey)) {
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UserModel user = authManager.authenticate(username, key);
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if (user != null) {
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client.setUser(user);
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return true;
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}
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}
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}
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log.warn(
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"could not authenticate {} for SSH using the supplied public key",
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username);
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return false;
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}
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@Override
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public void sessionCreated(Session session) {
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}
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@Override
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public void sessionEvent(Session sesssion, Event event) {
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}
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@Override
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public void sessionClosed(Session session) {
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cache.remove(session);
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}
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}
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