/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.karaf.shell.ssh;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.net.URL;
import java.security.KeyPair;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.felix.service.command.CommandSession;
import org.apache.sshd.agent.SshAgent;
import org.apache.sshd.agent.SshAgentFactory;
import org.apache.sshd.agent.SshAgentServer;
import org.apache.sshd.agent.common.AgentDelegate;
import org.apache.sshd.agent.local.AgentImpl;
import org.apache.sshd.agent.local.AgentServerProxy;
import org.apache.sshd.agent.local.ChannelAgentForwarding;
import org.apache.sshd.common.Channel;
import org.apache.sshd.common.FactoryManager;
import org.apache.sshd.common.NamedFactory;
import org.apache.sshd.common.Session;
import org.apache.sshd.common.session.ConnectionService;
import org.apache.sshd.server.session.ServerSession;
import org.osgi.framework.BundleContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class KarafAgentFactory implements SshAgentFactory {
private static final Logger LOGGER = LoggerFactory.getLogger(KarafAgentFactory.class);
private final Map<String, AgentServerProxy> proxies = new ConcurrentHashMap<String, AgentServerProxy>();
private final Map<String, SshAgent> locals = new ConcurrentHashMap<String, SshAgent>();
private BundleContext bundleContext;
public BundleContext getBundleContext() {
return bundleContext;
}
public void setBundleContext(BundleContext bundleContext) {
this.bundleContext = bundleContext;
}
public NamedFactory<Channel> getChannelForwardingFactory() {
return new ChannelAgentForwarding.Factory();
}
public SshAgent createClient(FactoryManager manager) throws IOException {
String proxyId = manager.getProperties().get(SshAgent.SSH_AUTHSOCKET_ENV_NAME);
if (proxyId == null) {
throw new IllegalStateException("No " + SshAgent.SSH_AUTHSOCKET_ENV_NAME + " environment variable set");
}
AgentServerProxy proxy = proxies.get(proxyId);
if (proxy != null) {
return proxy.createClient();
}
SshAgent agent = locals.get(proxyId);
if (agent != null) {
return new AgentDelegate(agent);
}
throw new IllegalStateException("No ssh agent found");
}
public SshAgentServer createServer(ConnectionService service) throws IOException {
Session session = service.getSession();
if (!(session instanceof ServerSession)) {
throw new IllegalStateException("The session used to create an agent server proxy must be a server session");
}
final AgentServerProxy proxy = new AgentServerProxy(service);
proxies.put(proxy.getId(), proxy);
return new SshAgentServer() {
public String getId() {
return proxy.getId();
}
public void close() {
proxies.remove(proxy.getId());
proxy.close();
}
};
}
public void registerCommandSession(CommandSession session) {
if (session != null) {
try {
String user = (String) session.get("USER");
SshAgent agent = new AgentImpl();
URL url = bundleContext.getBundle().getResource("karaf.key");
InputStream is = url.openStream();
ObjectInputStream r = new ObjectInputStream(is);
KeyPair keyPair = (KeyPair) r.readObject();
agent.addIdentity(keyPair, "karaf");
String agentId = "local:" + user;
session.put(SshAgent.SSH_AUTHSOCKET_ENV_NAME, agentId);
locals.put(agentId, agent);
} catch (Throwable e) {
LOGGER.warn("Error starting ssh agent for local console", e);
}
}
}
public void unregisterCommandSession(CommandSession session) {
if (session != null) {
try {
String agentId = (String) session.get(SshAgent.SSH_AUTHSOCKET_ENV_NAME);
session.put(SshAgent.SSH_AUTHSOCKET_ENV_NAME, null);
if (agentId != null) {
locals.remove(agentId);
}
} catch (Throwable e) {
LOGGER.warn("Error stopping ssh agent for local console", e);
}
}
}
}