| /* |
| * 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; |
| |
| /** |
| * Authenticates an SSH session against a public key. |
| * |
| */ |
| 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.isEmpty()) { |
| log.info("{} has not added any public keys for ssh authentication", username); |
| return false; |
| } |
| |
| SshKey pk = new SshKey(suppliedKey); |
| log.debug("auth supplied {}", pk.getFingerprint()); |
| |
| for (SshKey key : keys) { |
| log.debug("auth compare to {}", key.getFingerprint()); |
| if (key.getPublicKey().equals(suppliedKey)) { |
| UserModel user = authManager.authenticate(username, key); |
| if (user != null) { |
| client.setUser(user); |
| client.setKey(key); |
| 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); |
| } |
| } |