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/*
* Copyright 2014 gitblit.com.
*
* Licensed 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 com.gitblit.transport.ssh;
import java.security.PublicKey;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.sshd.common.Session;
import org.apache.sshd.common.SessionListener;
import org.apache.sshd.server.PublickeyAuthenticator;
import org.apache.sshd.server.session.ServerSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.gitblit.manager.IAuthenticationManager;
import com.gitblit.models.UserModel;
import com.google.common.base.Preconditions;
/**
*
* @author Eric Myrhe
*
*/
public class CachingPublicKeyAuthenticator implements PublickeyAuthenticator,
SessionListener {
protected final Logger log = LoggerFactory.getLogger(getClass());
protected final IPublicKeyManager keyManager;
protected final IAuthenticationManager authManager;
private final Map<ServerSession, Map<PublicKey, Boolean>> cache =
new ConcurrentHashMap<ServerSession, Map<PublicKey, Boolean>>();
public CachingPublicKeyAuthenticator(IPublicKeyManager keyManager,
IAuthenticationManager authManager) {
this.keyManager = keyManager;
this.authManager = authManager;
}
@Override
public boolean authenticate(String username, PublicKey key,
ServerSession session) {
Map<PublicKey, Boolean> map = cache.get(session);
if (map == null) {
map = new HashMap<PublicKey, Boolean>();
cache.put(session, map);
session.addListener(this);
}
if (map.containsKey(key)) {
return map.get(key);
}
boolean result = doAuthenticate(username, key, session);
map.put(key, result);
return result;
}
private boolean doAuthenticate(String username, PublicKey suppliedKey,
ServerSession session) {
SshDaemonClient client = session.getAttribute(SshDaemonClient.KEY);
Preconditions.checkState(client.getUser() == null);
username = username.toLowerCase(Locale.US);
List<SshKey> keys = keyManager.getKeys(username);
if (keys == null || keys.isEmpty()) {
log.info("{} has not added any public keys for ssh authentication",
username);
return false;
}
for (SshKey key : keys) {
if (key.equals(suppliedKey)) {
UserModel user = authManager.authenticate(username, key);
if (user != null) {
client.setUser(user);
return true;
}
}
}
log.warn("could not authenticate {} for SSH using the supplied public key",
username);
return false;
}
@Override
public void sessionCreated(Session session) {
}
@Override
public void sessionEvent(Session sesssion, Event event) {
}
@Override
public void sessionClosed(Session session) {
cache.remove(session);
}
}
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