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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.List;
import java.util.Locale;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
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.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
/**
*
* @author Eric Myrhe
*
*/
public class SshKeyAuthenticator implements PublickeyAuthenticator {
protected final Logger log = LoggerFactory.getLogger(getClass());
protected final IKeyManager keyManager;
protected final IAuthenticationManager authManager;
LoadingCache<String, List<PublicKey>> sshKeyCache = CacheBuilder
.newBuilder().
expireAfterAccess(15, TimeUnit.MINUTES).
maximumSize(100)
.build(new CacheLoader<String, List<PublicKey>>() {
@Override
public List<PublicKey> load(String username) {
return keyManager.getKeys(username);
}
});
public SshKeyAuthenticator(IKeyManager keyManager, IAuthenticationManager authManager) {
this.keyManager = keyManager;
this.authManager = authManager;
}
@Override
public boolean authenticate(String username, final PublicKey suppliedKey,
final ServerSession session) {
final SshSession client = session.getAttribute(SshSession.KEY);
if (client.getRemoteUser() != null) {
// TODO why do we re-authenticate?
log.info("{} has already authenticated!", username);
return true;
}
username = username.toLowerCase(Locale.US);
try {
List<PublicKey> keys = sshKeyCache.get(username);
if (keys == null || keys.isEmpty()) {
log.info("{} has not added any public keys for ssh authentication", username);
return false;
}
for (PublicKey key : keys) {
if (key.equals(suppliedKey)) {
UserModel user = authManager.authenticate(username, key);
if (user != null) {
client.authenticationSuccess(username);
return true;
}
}
}
} catch (ExecutionException e) {
}
log.warn("could not authenticate {} for SSH using the supplied public key", username);
return false;
}
public IKeyManager getKeyManager() {
return keyManager;
}
public Cache<String, List<PublicKey>> getKeyCache() {
return sshKeyCache;
}
}
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