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