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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.utils;
import java.io.IOException;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.management.ManagementFactory;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.rmi.AccessException;
import java.rmi.AlreadyBoundException;
import java.rmi.NoSuchObjectException;
import java.rmi.NotBoundException;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.registry.Registry;
import java.rmi.server.RMIClientSocketFactory;
import java.rmi.server.RMIServerSocketFactory;
import java.rmi.server.UnicastRemoteObject;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;
import javax.management.remote.*;
import javax.management.remote.rmi.RMIConnectorServer;
import javax.management.remote.rmi.RMIJRMPServerImpl;
import javax.rmi.ssl.SslRMIClientSocketFactory;
import javax.rmi.ssl.SslRMIServerSocketFactory;
import javax.security.auth.Subject;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableMap;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.auth.jmx.AuthenticationProxy;
import static org.apache.cassandra.config.CassandraRelevantProperties.COM_SUN_MANAGEMENT_JMXREMOTE_ACCESS_FILE;
import static org.apache.cassandra.config.CassandraRelevantProperties.COM_SUN_MANAGEMENT_JMXREMOTE_AUTHENTICATE;
import static org.apache.cassandra.config.CassandraRelevantProperties.COM_SUN_MANAGEMENT_JMXREMOTE_PASSWORD_FILE;
import static org.apache.cassandra.config.CassandraRelevantProperties.COM_SUN_MANAGEMENT_JMXREMOTE_RMI_PORT;
import static org.apache.cassandra.config.CassandraRelevantProperties.COM_SUN_MANAGEMENT_JMXREMOTE_SSL;
import static org.apache.cassandra.config.CassandraRelevantProperties.COM_SUN_MANAGEMENT_JMXREMOTE_SSL_ENABLED_CIPHER_SUITES;
import static org.apache.cassandra.config.CassandraRelevantProperties.COM_SUN_MANAGEMENT_JMXREMOTE_SSL_ENABLED_PROTOCOLS;
import static org.apache.cassandra.config.CassandraRelevantProperties.COM_SUN_MANAGEMENT_JMXREMOTE_SSL_NEED_CLIENT_AUTH;
public class JMXServerUtils
{
private static final Logger logger = LoggerFactory.getLogger(JMXServerUtils.class);
/**
* Creates a server programmatically. This allows us to set parameters which normally are
* inaccessable.
*/
@SuppressWarnings("resource")
@VisibleForTesting
public static JMXConnectorServer createJMXServer(int port, String hostname, boolean local)
throws IOException
{
Map env = new HashMap<>();
InetAddress serverAddress = null;
if (local)
{
serverAddress = InetAddress.getLoopbackAddress();
System.setProperty("java.rmi.server.hostname", serverAddress.getHostAddress());
}
// Configure the RMI client & server socket factories, including SSL config.
env.putAll(configureJmxSocketFactories(serverAddress, local));
// configure the RMI registry
Registry registry = new JmxRegistry(port,
(RMIClientSocketFactory) env.get(RMIConnectorServer.RMI_CLIENT_SOCKET_FACTORY_ATTRIBUTE),
(RMIServerSocketFactory) env.get(RMIConnectorServer.RMI_SERVER_SOCKET_FACTORY_ATTRIBUTE),
"jmxrmi");
// Configure authn, using a JMXAuthenticator which either wraps a set log LoginModules configured
// via a JAAS configuration entry, or one which delegates to the standard file based authenticator.
// Authn is disabled if com.sun.management.jmxremote.authenticate=false
env.putAll(configureJmxAuthentication());
// Configure authz - if a custom proxy class is specified an instance will be returned.
// If not, but a location for the standard access file is set in system properties, the
// return value is null, and an entry is added to the env map detailing that location
// If neither method is specified, no access control is applied
MBeanServerForwarder authzProxy = configureJmxAuthorization(env);
// Mark the JMX server as a permanently exported object. This allows the JVM to exit with the
// server running and also exempts it from the distributed GC scheduler which otherwise would
// potentially attempt a full GC every `sun.rmi.dgc.server.gcInterval` millis (default is 3600000ms)
// For more background see:
// - CASSANDRA-2967
// - https://www.jclarity.com/2015/01/27/rmi-system-gc-unplugged/
// - https://bugs.openjdk.java.net/browse/JDK-6760712
env.put("jmx.remote.x.daemon", "true");
// Set the port used to create subsequent connections to exported objects over RMI. This simplifies
// configuration in firewalled environments, but it can't be used in conjuction with SSL sockets.
// See: CASSANDRA-7087
int rmiPort = COM_SUN_MANAGEMENT_JMXREMOTE_RMI_PORT.getInt();
// We create the underlying RMIJRMPServerImpl so that we can manually bind it to the registry,
// rather then specifying a binding address in the JMXServiceURL and letting it be done automatically
// when the server is started. The reason for this is that if the registry is configured with SSL
// sockets, the JMXConnectorServer acts as its client during the binding which means it needs to
// have a truststore configured which contains the registry's certificate. Manually binding removes
// this problem.
// See CASSANDRA-12109.
RMIJRMPServerImpl server = new RMIJRMPServerImpl(rmiPort,
(RMIClientSocketFactory) env.get(RMIConnectorServer.RMI_CLIENT_SOCKET_FACTORY_ATTRIBUTE),
(RMIServerSocketFactory) env.get(RMIConnectorServer.RMI_SERVER_SOCKET_FACTORY_ATTRIBUTE),
env);
JMXServiceURL serviceURL = new JMXServiceURL("rmi", hostname, rmiPort);
RMIConnectorServer jmxServer = new RMIConnectorServer(serviceURL, env, server, ManagementFactory.getPlatformMBeanServer());
// If a custom authz proxy was created, attach it to the server now.
if (authzProxy != null)
jmxServer.setMBeanServerForwarder(authzProxy);
jmxServer.start();
((JmxRegistry)registry).setRemoteServerStub(server.toStub());
logJmxServiceUrl(serverAddress, port);
return jmxServer;
}
@SuppressWarnings("resource")
public static JMXConnectorServer createJMXServer(int port, boolean local) throws IOException
{
return createJMXServer(port, null, local);
}
private static Map configureJmxAuthentication()
{
Map env = new HashMap<>();
if (!COM_SUN_MANAGEMENT_JMXREMOTE_AUTHENTICATE.getBoolean())
return env;
// If authentication is enabled, initialize the appropriate JMXAuthenticator
// and stash it in the environment settings.
// A JAAS configuration entry takes precedence. If one is supplied, use
// Cassandra's own custom JMXAuthenticator implementation which delegates
// auth to the LoginModules specified by the JAAS configuration entry.
// If no JAAS entry is found, an instance of the JDK's own
// JMXPluggableAuthenticator is created. In that case, the admin may have
// set a location for the JMX password file which must be added to env
// before creating the authenticator. If no password file has been
// explicitly set, it's read from the default location
// $JAVA_HOME/lib/management/jmxremote.password
String configEntry = System.getProperty("cassandra.jmx.remote.login.config");
if (configEntry != null)
{
env.put(JMXConnectorServer.AUTHENTICATOR, new AuthenticationProxy(configEntry));
}
else
{
String passwordFile = COM_SUN_MANAGEMENT_JMXREMOTE_PASSWORD_FILE.getString();
if (passwordFile != null)
{
// stash the password file location where JMXPluggableAuthenticator expects it
env.put("jmx.remote.x.password.file", passwordFile);
}
env.put(JMXConnectorServer.AUTHENTICATOR, new JMXPluggableAuthenticatorWrapper(env));
}
env.put("jmx.remote.rmi.server.credential.types",
new String[] { String[].class.getName(), String.class.getName() });
return env;
}
private static MBeanServerForwarder configureJmxAuthorization(Map env)
{
// If a custom authz proxy is supplied (Cassandra ships with AuthorizationProxy, which
// delegates to its own role based IAuthorizer), then instantiate and return one which
// can be set as the JMXConnectorServer's MBeanServerForwarder.
// If no custom proxy is supplied, check system properties for the location of the
// standard access file & stash it in env
String authzProxyClass = System.getProperty("cassandra.jmx.authorizer");
if (authzProxyClass != null)
{
final InvocationHandler handler = FBUtilities.construct(authzProxyClass, "JMX authz proxy");
final Class[] interfaces = { MBeanServerForwarder.class };
Object proxy = Proxy.newProxyInstance(MBeanServerForwarder.class.getClassLoader(), interfaces, handler);
return MBeanServerForwarder.class.cast(proxy);
}
else
{
String accessFile = COM_SUN_MANAGEMENT_JMXREMOTE_ACCESS_FILE.getString();
if (accessFile != null)
{
env.put("jmx.remote.x.access.file", accessFile);
}
return null;
}
}
private static Map configureJmxSocketFactories(InetAddress serverAddress, boolean localOnly)
{
Map env = new HashMap<>();
if (COM_SUN_MANAGEMENT_JMXREMOTE_SSL.getBoolean())
{
boolean requireClientAuth = COM_SUN_MANAGEMENT_JMXREMOTE_SSL_NEED_CLIENT_AUTH.getBoolean();
String[] protocols = null;
String protocolList = COM_SUN_MANAGEMENT_JMXREMOTE_SSL_ENABLED_PROTOCOLS.getString();
if (protocolList != null)
{
System.setProperty("javax.rmi.ssl.client.enabledProtocols", protocolList);
protocols = StringUtils.split(protocolList, ',');
}
String[] ciphers = null;
String cipherList = COM_SUN_MANAGEMENT_JMXREMOTE_SSL_ENABLED_CIPHER_SUITES.getString();
if (cipherList != null)
{
System.setProperty("javax.rmi.ssl.client.enabledCipherSuites", cipherList);
ciphers = StringUtils.split(cipherList, ',');
}
SslRMIClientSocketFactory clientFactory = new SslRMIClientSocketFactory();
SslRMIServerSocketFactory serverFactory = new SslRMIServerSocketFactory(ciphers, protocols, requireClientAuth);
env.put(RMIConnectorServer.RMI_SERVER_SOCKET_FACTORY_ATTRIBUTE, serverFactory);
env.put(RMIConnectorServer.RMI_CLIENT_SOCKET_FACTORY_ATTRIBUTE, clientFactory);
env.put("com.sun.jndi.rmi.factory.socket", clientFactory);
logJmxSslConfig(serverFactory);
}
else if (localOnly)
{
env.put(RMIConnectorServer.RMI_SERVER_SOCKET_FACTORY_ATTRIBUTE,
new RMIServerSocketFactoryImpl(serverAddress));
}
return env;
}
@VisibleForTesting
public static void logJmxServiceUrl(InetAddress serverAddress, int port)
{
String urlTemplate = "service:jmx:rmi://%1$s/jndi/rmi://%1$s:%2$d/jmxrmi";
String hostName;
if (serverAddress == null)
{
hostName = FBUtilities.getJustBroadcastAddress() instanceof Inet6Address ? "[::]" : "0.0.0.0";
}
else
{
// hostnames based on IPv6 addresses must be wrapped in [ ]
hostName = serverAddress instanceof Inet6Address
? '[' + serverAddress.getHostAddress() + ']'
: serverAddress.getHostAddress();
}
String url = String.format(urlTemplate, hostName, port);
logger.info("Configured JMX server at: {}", url);
}
private static void logJmxSslConfig(SslRMIServerSocketFactory serverFactory)
{
if (logger.isDebugEnabled())
logger.debug("JMX SSL configuration. { protocols: [{}], cipher_suites: [{}], require_client_auth: {} }",
serverFactory.getEnabledProtocols() == null
? "'JVM defaults'"
: Arrays.stream(serverFactory.getEnabledProtocols()).collect(Collectors.joining("','", "'", "'")),
serverFactory.getEnabledCipherSuites() == null
? "'JVM defaults'"
: Arrays.stream(serverFactory.getEnabledCipherSuites()).collect(Collectors.joining("','", "'", "'")),
serverFactory.getNeedClientAuth());
}
private static class JMXPluggableAuthenticatorWrapper implements JMXAuthenticator
{
private static final MethodHandle ctorHandle;
static
{
try
{
Class c = Class.forName("com.sun.jmx.remote.security.JMXPluggableAuthenticator");
Constructor ctor = c.getDeclaredConstructor(Map.class);
ctorHandle = MethodHandles.lookup().unreflectConstructor(ctor);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
final Map env;
private JMXPluggableAuthenticatorWrapper(Map env)
{
this.env = ImmutableMap.copyOf(env);
}
public Subject authenticate(Object credentials)
{
try
{
JMXAuthenticator authenticator = (JMXAuthenticator) ctorHandle.invoke(env);
return authenticator.authenticate(credentials);
}
catch (Throwable e)
{
throw new RuntimeException(e);
}
}
}
/*
* Better to use the internal API than re-invent the wheel.
*/
@SuppressWarnings("restriction")
public static class JmxRegistry extends sun.rmi.registry.RegistryImpl {
private final String lookupName;
private Remote remoteServerStub;
public JmxRegistry(final int port,
final RMIClientSocketFactory csf,
RMIServerSocketFactory ssf,
final String lookupName) throws RemoteException {
super(port, csf, ssf);
this.lookupName = lookupName;
}
@Override
public Remote lookup(String s) throws RemoteException, NotBoundException {
return lookupName.equals(s) ? remoteServerStub : null;
}
@Override
public void bind(String s, Remote remote) throws RemoteException, AlreadyBoundException, AccessException {
}
@Override
public void unbind(String s) throws RemoteException, NotBoundException, AccessException {
}
@Override
public void rebind(String s, Remote remote) throws RemoteException, AccessException {
}
@Override
public String[] list() throws RemoteException {
return new String[] {lookupName};
}
public void setRemoteServerStub(Remote remoteServerStub) {
this.remoteServerStub = remoteServerStub;
}
/**
* Closes the underlying JMX registry by unexporting this instance.
* There is no reason to do this except for in-jvm dtests where we need
* to stop the registry, so we can start with a clean slate for future cluster
* builds, and the superclass never expects to be shut down and therefore doesn't
* handle this edge case at all.
*/
@VisibleForTesting
public void close() {
try
{
UnicastRemoteObject.unexportObject(this, true);
}
catch (NoSuchObjectException ignored)
{
// Ignore if it's already unexported
}
}
}
}
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