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/**
* 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.hadoop.http;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.BindException;
import java.net.InetSocketAddress;
import java.net.URL;
import java.security.GeneralSecurityException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.net.ssl.SSLServerSocketFactory;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.ConfServlet;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonConfigurationKeys;
import org.apache.hadoop.jmx.JMXJsonServlet;
import org.apache.hadoop.log.LogLevel;
import org.apache.hadoop.metrics.MetricsServlet;
import org.apache.hadoop.security.SecurityUtil;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.authentication.server.AuthenticationFilter;
import org.apache.hadoop.security.authorize.AccessControlList;
import org.apache.hadoop.security.ssl.SSLFactory;
import org.apache.hadoop.util.ReflectionUtils;
import org.mortbay.io.Buffer;
import org.mortbay.jetty.Connector;
import org.mortbay.jetty.Handler;
import org.mortbay.jetty.MimeTypes;
import org.mortbay.jetty.Server;
import org.mortbay.jetty.handler.ContextHandler;
import org.mortbay.jetty.handler.ContextHandlerCollection;
import org.mortbay.jetty.nio.SelectChannelConnector;
import org.mortbay.jetty.security.SslSocketConnector;
import org.mortbay.jetty.servlet.Context;
import org.mortbay.jetty.servlet.DefaultServlet;
import org.mortbay.jetty.servlet.FilterHolder;
import org.mortbay.jetty.servlet.FilterMapping;
import org.mortbay.jetty.servlet.ServletHandler;
import org.mortbay.jetty.servlet.ServletHolder;
import org.mortbay.jetty.webapp.WebAppContext;
import org.mortbay.thread.QueuedThreadPool;
import org.mortbay.util.MultiException;
import com.sun.jersey.spi.container.servlet.ServletContainer;
/**
* Create a Jetty embedded server to answer http requests. The primary goal
* is to serve up status information for the server.
* There are three contexts:
* "/logs/" -> points to the log directory
* "/static/" -> points to common static files (src/webapps/static)
* "/" -> the jsp server code from (src/webapps/)
*/
@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce", "HBase"})
@InterfaceStability.Evolving
public class HttpServer implements FilterContainer {
public static final Log LOG = LogFactory.getLog(HttpServer.class);
static final String FILTER_INITIALIZER_PROPERTY
= "hadoop.http.filter.initializers";
static final String HTTP_MAX_THREADS = "hadoop.http.max.threads";
// The ServletContext attribute where the daemon Configuration
// gets stored.
public static final String CONF_CONTEXT_ATTRIBUTE = "hadoop.conf";
public static final String ADMINS_ACL = "admins.acl";
public static final String SPNEGO_FILTER = "SpnegoFilter";
public static final String NO_CACHE_FILTER = "NoCacheFilter";
public static final String BIND_ADDRESS = "bind.address";
private AccessControlList adminsAcl;
private SSLFactory sslFactory;
protected final Server webServer;
protected final Connector listener;
protected final WebAppContext webAppContext;
protected final boolean findPort;
protected final Map defaultContexts =
new HashMap();
protected final List filterNames = new ArrayList();
private static final int MAX_RETRIES = 10;
static final String STATE_DESCRIPTION_ALIVE = " - alive";
static final String STATE_DESCRIPTION_NOT_LIVE = " - not live";
private final boolean listenerStartedExternally;
/** Same as this(name, bindAddress, port, findPort, null); */
public HttpServer(String name, String bindAddress, int port, boolean findPort
) throws IOException {
this(name, bindAddress, port, findPort, new Configuration());
}
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf, Connector connector) throws IOException {
this(name, bindAddress, port, findPort, conf, null, connector, null);
}
/**
* Create a status server on the given port. Allows you to specify the
* path specifications that this server will be serving so that they will be
* added to the filters properly.
*
* @param name The name of the server
* @param bindAddress The address for this server
* @param port The port to use on the server
* @param findPort whether the server should start at the given port and
* increment by 1 until it finds a free port.
* @param conf Configuration
* @param pathSpecs Path specifications that this httpserver will be serving.
* These will be added to any filters.
*/
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf, String[] pathSpecs) throws IOException {
this(name, bindAddress, port, findPort, conf, null, null, pathSpecs);
}
/**
* Create a status server on the given port.
* The jsp scripts are taken from src/webapps/.
* @param name The name of the server
* @param port The port to use on the server
* @param findPort whether the server should start at the given port and
* increment by 1 until it finds a free port.
* @param conf Configuration
*/
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf) throws IOException {
this(name, bindAddress, port, findPort, conf, null, null, null);
}
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf, AccessControlList adminsAcl)
throws IOException {
this(name, bindAddress, port, findPort, conf, adminsAcl, null, null);
}
/**
* Create a status server on the given port.
* The jsp scripts are taken from src/webapps/.
* @param name The name of the server
* @param bindAddress The address for this server
* @param port The port to use on the server
* @param findPort whether the server should start at the given port and
* increment by 1 until it finds a free port.
* @param conf Configuration
* @param adminsAcl {@link AccessControlList} of the admins
*/
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf, AccessControlList adminsAcl,
Connector connector) throws IOException {
this(name, bindAddress, port, findPort, conf, adminsAcl, connector, null);
}
/**
* Create a status server on the given port.
* The jsp scripts are taken from src/webapps/.
* @param name The name of the server
* @param bindAddress The address for this server
* @param port The port to use on the server
* @param findPort whether the server should start at the given port and
* increment by 1 until it finds a free port.
* @param conf Configuration
* @param adminsAcl {@link AccessControlList} of the admins
* @param connector A jetty connection listener
* @param pathSpecs Path specifications that this httpserver will be serving.
* These will be added to any filters.
*/
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf, AccessControlList adminsAcl,
Connector connector, String[] pathSpecs) throws IOException {
webServer = new Server();
this.findPort = findPort;
this.adminsAcl = adminsAcl;
if(connector == null) {
listenerStartedExternally = false;
if (HttpConfig.isSecure()) {
sslFactory = new SSLFactory(SSLFactory.Mode.SERVER, conf);
try {
sslFactory.init();
} catch (GeneralSecurityException ex) {
throw new IOException(ex);
}
SslSocketConnector sslListener = new SslSocketConnector() {
@Override
protected SSLServerSocketFactory createFactory() throws Exception {
return sslFactory.createSSLServerSocketFactory();
}
};
listener = sslListener;
} else {
listener = createBaseListener(conf);
}
listener.setHost(bindAddress);
listener.setPort(port);
LOG.info("SSL is enabled on " + toString());
} else {
listenerStartedExternally = true;
listener = connector;
}
webServer.addConnector(listener);
int maxThreads = conf.getInt(HTTP_MAX_THREADS, -1);
// If HTTP_MAX_THREADS is not configured, QueueThreadPool() will use the
// default value (currently 250).
QueuedThreadPool threadPool = maxThreads == -1 ?
new QueuedThreadPool() : new QueuedThreadPool(maxThreads);
webServer.setThreadPool(threadPool);
final String appDir = getWebAppsPath(name);
ContextHandlerCollection contexts = new ContextHandlerCollection();
webServer.setHandler(contexts);
webAppContext = new WebAppContext();
webAppContext.setDisplayName(name);
webAppContext.setContextPath("/");
webAppContext.setWar(appDir + "/" + name);
webAppContext.getServletContext().setAttribute(CONF_CONTEXT_ATTRIBUTE, conf);
webAppContext.getServletContext().setAttribute(ADMINS_ACL, adminsAcl);
addNoCacheFilter(webAppContext);
webServer.addHandler(webAppContext);
addDefaultApps(contexts, appDir, conf);
addGlobalFilter("safety", QuotingInputFilter.class.getName(), null);
final FilterInitializer[] initializers = getFilterInitializers(conf);
if (initializers != null) {
conf = new Configuration(conf);
conf.set(BIND_ADDRESS, bindAddress);
for(FilterInitializer c : initializers) {
c.initFilter(this, conf);
}
}
addDefaultServlets();
if (pathSpecs != null) {
for (String path : pathSpecs) {
LOG.info("adding path spec: " + path);
addFilterPathMapping(path, webAppContext);
}
}
}
@SuppressWarnings("unchecked")
private void addNoCacheFilter(WebAppContext ctxt) {
defineFilter(ctxt, NO_CACHE_FILTER,
NoCacheFilter.class.getName(), Collections.EMPTY_MAP, new String[] { "/*"});
}
/**
* Create a required listener for the Jetty instance listening on the port
* provided. This wrapper and all subclasses must create at least one
* listener.
*/
public Connector createBaseListener(Configuration conf) throws IOException {
return HttpServer.createDefaultChannelConnector();
}
@InterfaceAudience.Private
public static Connector createDefaultChannelConnector() {
SelectChannelConnector ret = new SelectChannelConnector();
ret.setLowResourceMaxIdleTime(10000);
ret.setAcceptQueueSize(128);
ret.setResolveNames(false);
ret.setUseDirectBuffers(false);
ret.setHeaderBufferSize(1024*64);
return ret;
}
/** Get an array of FilterConfiguration specified in the conf */
private static FilterInitializer[] getFilterInitializers(Configuration conf) {
if (conf == null) {
return null;
}
Class[] classes = conf.getClasses(FILTER_INITIALIZER_PROPERTY);
if (classes == null) {
return null;
}
FilterInitializer[] initializers = new FilterInitializer[classes.length];
for(int i = 0; i < classes.length; i++) {
initializers[i] = (FilterInitializer)ReflectionUtils.newInstance(
classes[i], conf);
}
return initializers;
}
/**
* Add default apps.
* @param appDir The application directory
* @throws IOException
*/
protected void addDefaultApps(ContextHandlerCollection parent,
final String appDir, Configuration conf) throws IOException {
// set up the context for "/logs/" if "hadoop.log.dir" property is defined.
String logDir = System.getProperty("hadoop.log.dir");
if (logDir != null) {
Context logContext = new Context(parent, "/logs");
logContext.setResourceBase(logDir);
logContext.addServlet(AdminAuthorizedServlet.class, "/*");
if (conf.getBoolean(
CommonConfigurationKeys.HADOOP_JETTY_LOGS_SERVE_ALIASES,
CommonConfigurationKeys.DEFAULT_HADOOP_JETTY_LOGS_SERVE_ALIASES)) {
logContext.getInitParams().put(
"org.mortbay.jetty.servlet.Default.aliases", "true");
}
logContext.setDisplayName("logs");
setContextAttributes(logContext, conf);
addNoCacheFilter(webAppContext);
defaultContexts.put(logContext, true);
}
// set up the context for "/static/*"
Context staticContext = new Context(parent, "/static");
staticContext.setResourceBase(appDir + "/static");
staticContext.addServlet(DefaultServlet.class, "/*");
staticContext.setDisplayName("static");
setContextAttributes(staticContext, conf);
defaultContexts.put(staticContext, true);
}
private void setContextAttributes(Context context, Configuration conf) {
context.getServletContext().setAttribute(CONF_CONTEXT_ATTRIBUTE, conf);
context.getServletContext().setAttribute(ADMINS_ACL, adminsAcl);
}
/**
* Add default servlets.
*/
protected void addDefaultServlets() {
// set up default servlets
addServlet("stacks", "/stacks", StackServlet.class);
addServlet("logLevel", "/logLevel", LogLevel.Servlet.class);
addServlet("metrics", "/metrics", MetricsServlet.class);
addServlet("jmx", "/jmx", JMXJsonServlet.class);
addServlet("conf", "/conf", ConfServlet.class);
}
public void addContext(Context ctxt, boolean isFiltered)
throws IOException {
webServer.addHandler(ctxt);
addNoCacheFilter(webAppContext);
defaultContexts.put(ctxt, isFiltered);
}
/**
* Add a context
* @param pathSpec The path spec for the context
* @param dir The directory containing the context
* @param isFiltered if true, the servlet is added to the filter path mapping
* @throws IOException
*/
protected void addContext(String pathSpec, String dir, boolean isFiltered) throws IOException {
if (0 == webServer.getHandlers().length) {
throw new RuntimeException("Couldn't find handler");
}
WebAppContext webAppCtx = new WebAppContext();
webAppCtx.setContextPath(pathSpec);
webAppCtx.setWar(dir);
addContext(webAppCtx, true);
}
/**
* Set a value in the webapp context. These values are available to the jsp
* pages as "application.getAttribute(name)".
* @param name The name of the attribute
* @param value The value of the attribute
*/
public void setAttribute(String name, Object value) {
webAppContext.setAttribute(name, value);
}
/**
* Add a Jersey resource package.
* @param packageName The Java package name containing the Jersey resource.
* @param pathSpec The path spec for the servlet
*/
public void addJerseyResourcePackage(final String packageName,
final String pathSpec) {
LOG.info("addJerseyResourcePackage: packageName=" + packageName
+ ", pathSpec=" + pathSpec);
final ServletHolder sh = new ServletHolder(ServletContainer.class);
sh.setInitParameter("com.sun.jersey.config.property.resourceConfigClass",
"com.sun.jersey.api.core.PackagesResourceConfig");
sh.setInitParameter("com.sun.jersey.config.property.packages", packageName);
webAppContext.addServlet(sh, pathSpec);
}
/**
* Add a servlet in the server.
* @param name The name of the servlet (can be passed as null)
* @param pathSpec The path spec for the servlet
* @param clazz The servlet class
*/
public void addServlet(String name, String pathSpec,
Class clazz) {
addInternalServlet(name, pathSpec, clazz, false);
addFilterPathMapping(pathSpec, webAppContext);
}
/**
* Add an internal servlet in the server.
* Note: This method is to be used for adding servlets that facilitate
* internal communication and not for user facing functionality. For
* servlets added using this method, filters are not enabled.
*
* @param name The name of the servlet (can be passed as null)
* @param pathSpec The path spec for the servlet
* @param clazz The servlet class
*/
public void addInternalServlet(String name, String pathSpec,
Class clazz) {
addInternalServlet(name, pathSpec, clazz, false);
}
/**
* Add an internal servlet in the server, specifying whether or not to
* protect with Kerberos authentication.
* Note: This method is to be used for adding servlets that facilitate
* internal communication and not for user facing functionality. For
+ * servlets added using this method, filters (except internal Kerberos
* filters) are not enabled.
*
* @param name The name of the servlet (can be passed as null)
* @param pathSpec The path spec for the servlet
* @param clazz The servlet class
* @param requireAuth Require Kerberos authenticate to access servlet
*/
public void addInternalServlet(String name, String pathSpec,
Class clazz, boolean requireAuth) {
ServletHolder holder = new ServletHolder(clazz);
if (name != null) {
holder.setName(name);
}
webAppContext.addServlet(holder, pathSpec);
if(requireAuth && UserGroupInformation.isSecurityEnabled()) {
LOG.info("Adding Kerberos (SPNEGO) filter to " + name);
ServletHandler handler = webAppContext.getServletHandler();
FilterMapping fmap = new FilterMapping();
fmap.setPathSpec(pathSpec);
fmap.setFilterName(SPNEGO_FILTER);
fmap.setDispatches(Handler.ALL);
handler.addFilterMapping(fmap);
}
}
/** {@inheritDoc} */
public void addFilter(String name, String classname,
Map parameters) {
final String[] USER_FACING_URLS = { "*.html", "*.jsp" };
defineFilter(webAppContext, name, classname, parameters, USER_FACING_URLS);
LOG.info("Added filter " + name + " (class=" + classname
+ ") to context " + webAppContext.getDisplayName());
final String[] ALL_URLS = { "/*" };
for (Map.Entry e : defaultContexts.entrySet()) {
if (e.getValue()) {
Context ctx = e.getKey();
defineFilter(ctx, name, classname, parameters, ALL_URLS);
LOG.info("Added filter " + name + " (class=" + classname
+ ") to context " + ctx.getDisplayName());
}
}
filterNames.add(name);
}
/** {@inheritDoc} */
public void addGlobalFilter(String name, String classname,
Map parameters) {
final String[] ALL_URLS = { "/*" };
defineFilter(webAppContext, name, classname, parameters, ALL_URLS);
for (Context ctx : defaultContexts.keySet()) {
defineFilter(ctx, name, classname, parameters, ALL_URLS);
}
LOG.info("Added global filter '" + name + "' (class=" + classname + ")");
}
/**
* Define a filter for a context and set up default url mappings.
*/
protected void defineFilter(Context ctx, String name,
String classname, Map parameters, String[] urls) {
FilterHolder holder = new FilterHolder();
holder.setName(name);
holder.setClassName(classname);
holder.setInitParameters(parameters);
FilterMapping fmap = new FilterMapping();
fmap.setPathSpecs(urls);
fmap.setDispatches(Handler.ALL);
fmap.setFilterName(name);
ServletHandler handler = ctx.getServletHandler();
handler.addFilter(holder, fmap);
}
/**
* Add the path spec to the filter path mapping.
* @param pathSpec The path spec
* @param webAppCtx The WebApplicationContext to add to
*/
protected void addFilterPathMapping(String pathSpec,
Context webAppCtx) {
ServletHandler handler = webAppCtx.getServletHandler();
for(String name : filterNames) {
FilterMapping fmap = new FilterMapping();
fmap.setPathSpec(pathSpec);
fmap.setFilterName(name);
fmap.setDispatches(Handler.ALL);
handler.addFilterMapping(fmap);
}
}
/**
* Get the value in the webapp context.
* @param name The name of the attribute
* @return The value of the attribute
*/
public Object getAttribute(String name) {
return webAppContext.getAttribute(name);
}
/**
* Get the pathname to the webapps files.
* @param appName eg "secondary" or "datanode"
* @return the pathname as a URL
* @throws FileNotFoundException if 'webapps' directory cannot be found on CLASSPATH.
*/
protected String getWebAppsPath(String appName) throws FileNotFoundException {
URL url = getClass().getClassLoader().getResource("webapps/" + appName);
if (url == null)
throw new FileNotFoundException("webapps/" + appName
+ " not found in CLASSPATH");
String urlString = url.toString();
return urlString.substring(0, urlString.lastIndexOf('/'));
}
/**
* Get the port that the server is on
* @return the port
*/
public int getPort() {
return webServer.getConnectors()[0].getLocalPort();
}
/**
* Set the min, max number of worker threads (simultaneous connections).
*/
public void setThreads(int min, int max) {
QueuedThreadPool pool = (QueuedThreadPool) webServer.getThreadPool() ;
pool.setMinThreads(min);
pool.setMaxThreads(max);
}
/**
* Configure an ssl listener on the server.
* @param addr address to listen on
* @param keystore location of the keystore
* @param storPass password for the keystore
* @param keyPass password for the key
* @deprecated Use {@link #addSslListener(InetSocketAddress, Configuration, boolean)}
*/
@Deprecated
public void addSslListener(InetSocketAddress addr, String keystore,
String storPass, String keyPass) throws IOException {
if (webServer.isStarted()) {
throw new IOException("Failed to add ssl listener");
}
SslSocketConnector sslListener = new SslSocketConnector();
sslListener.setHost(addr.getHostName());
sslListener.setPort(addr.getPort());
sslListener.setKeystore(keystore);
sslListener.setPassword(storPass);
sslListener.setKeyPassword(keyPass);
webServer.addConnector(sslListener);
}
/**
* Configure an ssl listener on the server.
* @param addr address to listen on
* @param sslConf conf to retrieve ssl options
* @param needCertsAuth whether x509 certificate authentication is required
*/
public void addSslListener(InetSocketAddress addr, Configuration sslConf,
boolean needCertsAuth) throws IOException {
if (webServer.isStarted()) {
throw new IOException("Failed to add ssl listener");
}
if (needCertsAuth) {
// setting up SSL truststore for authenticating clients
System.setProperty("javax.net.ssl.trustStore", sslConf.get(
"ssl.server.truststore.location", ""));
System.setProperty("javax.net.ssl.trustStorePassword", sslConf.get(
"ssl.server.truststore.password", ""));
System.setProperty("javax.net.ssl.trustStoreType", sslConf.get(
"ssl.server.truststore.type", "jks"));
}
SslSocketConnector sslListener = new SslSocketConnector();
sslListener.setHost(addr.getHostName());
sslListener.setPort(addr.getPort());
sslListener.setKeystore(sslConf.get("ssl.server.keystore.location"));
sslListener.setPassword(sslConf.get("ssl.server.keystore.password", ""));
sslListener.setKeyPassword(sslConf.get("ssl.server.keystore.keypassword", ""));
sslListener.setKeystoreType(sslConf.get("ssl.server.keystore.type", "jks"));
sslListener.setNeedClientAuth(needCertsAuth);
webServer.addConnector(sslListener);
}
protected void initSpnego(Configuration conf,
String usernameConfKey, String keytabConfKey) throws IOException {
Map params = new HashMap();
String principalInConf = conf.get(usernameConfKey);
if (principalInConf != null && !principalInConf.isEmpty()) {
params.put("kerberos.principal",
SecurityUtil.getServerPrincipal(principalInConf, listener.getHost()));
}
String httpKeytab = conf.get(keytabConfKey);
if (httpKeytab != null && !httpKeytab.isEmpty()) {
params.put("kerberos.keytab", httpKeytab);
}
params.put(AuthenticationFilter.AUTH_TYPE, "kerberos");
defineFilter(webAppContext, SPNEGO_FILTER,
AuthenticationFilter.class.getName(), params, null);
}
/**
* Start the server. Does not wait for the server to start.
*/
public void start() throws IOException {
try {
try {
openListener();
LOG.info("Jetty bound to port " + listener.getLocalPort());
webServer.start();
} catch (IOException ex) {
LOG.info("HttpServer.start() threw a non Bind IOException", ex);
throw ex;
} catch (MultiException ex) {
LOG.info("HttpServer.start() threw a MultiException", ex);
throw ex;
}
// Make sure there is no handler failures.
Handler[] handlers = webServer.getHandlers();
for (int i = 0; i < handlers.length; i++) {
if (handlers[i].isFailed()) {
throw new IOException(
"Problem in starting http server. Server handlers failed");
}
}
// Make sure there are no errors initializing the context.
Throwable unavailableException = webAppContext.getUnavailableException();
if (unavailableException != null) {
// Have to stop the webserver, or else its non-daemon threads
// will hang forever.
webServer.stop();
throw new IOException("Unable to initialize WebAppContext",
unavailableException);
}
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw new IOException("Problem starting http server", e);
}
}
/**
* Open the main listener for the server
* @throws Exception
*/
void openListener() throws Exception {
if (listener.getLocalPort() != -1) { // it's already bound
return;
}
if (listenerStartedExternally) { // Expect that listener was started securely
throw new Exception("Expected webserver's listener to be started " +
"previously but wasn't");
}
int port = listener.getPort();
while (true) {
// jetty has a bug where you can't reopen a listener that previously
// failed to open w/o issuing a close first, even if the port is changed
try {
listener.close();
listener.open();
break;
} catch (BindException ex) {
if (port == 0 || !findPort) {
BindException be = new BindException(
"Port in use: " + listener.getHost() + ":" + listener.getPort());
be.initCause(ex);
throw be;
}
}
// try the next port number
listener.setPort(++port);
Thread.sleep(100);
}
}
/**
* Return the bind address of the listener.
* @return InetSocketAddress of the listener
*/
public InetSocketAddress getListenerAddress() {
int port = listener.getLocalPort();
if (port == -1) { // not bound, return requested port
port = listener.getPort();
}
return new InetSocketAddress(listener.getHost(), port);
}
/**
* stop the server
*/
public void stop() throws Exception {
MultiException exception = null;
try {
listener.close();
} catch (Exception e) {
LOG.error("Error while stopping listener for webapp"
+ webAppContext.getDisplayName(), e);
exception = addMultiException(exception, e);
}
try {
if (sslFactory != null) {
sslFactory.destroy();
}
} catch (Exception e) {
LOG.error("Error while destroying the SSLFactory"
+ webAppContext.getDisplayName(), e);
exception = addMultiException(exception, e);
}
try {
// clear & stop webAppContext attributes to avoid memory leaks.
webAppContext.clearAttributes();
webAppContext.stop();
} catch (Exception e) {
LOG.error("Error while stopping web app context for webapp "
+ webAppContext.getDisplayName(), e);
exception = addMultiException(exception, e);
}
try {
webServer.stop();
} catch (Exception e) {
LOG.error("Error while stopping web server for webapp "
+ webAppContext.getDisplayName(), e);
exception = addMultiException(exception, e);
}
if (exception != null) {
exception.ifExceptionThrow();
}
}
private MultiException addMultiException(MultiException exception, Exception e) {
if(exception == null){
exception = new MultiException();
}
exception.add(e);
return exception;
}
public void join() throws InterruptedException {
webServer.join();
}
/**
* Test for the availability of the web server
* @return true if the web server is started, false otherwise
*/
public boolean isAlive() {
return webServer != null && webServer.isStarted();
}
/**
* Return the host and port of the HttpServer, if live
* @return the classname and any HTTP URL
*/
@Override
public String toString() {
return listener != null ?
("HttpServer at http://" + listener.getHost() + ":" + listener.getLocalPort() + "/"
+ (isAlive() ? STATE_DESCRIPTION_ALIVE : STATE_DESCRIPTION_NOT_LIVE))
: "Inactive HttpServer";
}
/**
* Checks the user has privileges to access to instrumentation servlets.
*
* If hadoop.security.instrumentation.requires.admin is set to FALSE
* (default value) it always returns TRUE.
*
* If hadoop.security.instrumentation.requires.admin is set to TRUE
* it will check that if the current user is in the admin ACLS. If the user is
* in the admin ACLs it returns TRUE, otherwise it returns FALSE.
*
* @param servletContext the servlet context.
* @param request the servlet request.
* @param response the servlet response.
* @return TRUE/FALSE based on the logic decribed above.
*/
public static boolean isInstrumentationAccessAllowed(
ServletContext servletContext, HttpServletRequest request,
HttpServletResponse response) throws IOException {
Configuration conf =
(Configuration) servletContext.getAttribute(CONF_CONTEXT_ATTRIBUTE);
boolean access = true;
boolean adminAccess = conf.getBoolean(
CommonConfigurationKeys.HADOOP_SECURITY_INSTRUMENTATION_REQUIRES_ADMIN,
false);
if (adminAccess) {
access = hasAdministratorAccess(servletContext, request, response);
}
return access;
}
/**
* Does the user sending the HttpServletRequest has the administrator ACLs? If
* it isn't the case, response will be modified to send an error to the user.
*
* @param servletContext
* @param request
* @param response used to send the error response if user does not have admin access.
* @return true if admin-authorized, false otherwise
* @throws IOException
*/
public static boolean hasAdministratorAccess(
ServletContext servletContext, HttpServletRequest request,
HttpServletResponse response) throws IOException {
Configuration conf =
(Configuration) servletContext.getAttribute(CONF_CONTEXT_ATTRIBUTE);
// If there is no authorization, anybody has administrator access.
if (!conf.getBoolean(
CommonConfigurationKeys.HADOOP_SECURITY_AUTHORIZATION, false)) {
return true;
}
String remoteUser = request.getRemoteUser();
if (remoteUser == null) {
response.sendError(HttpServletResponse.SC_UNAUTHORIZED,
"Unauthenticated users are not " +
"authorized to access this page.");
return false;
}
if (servletContext.getAttribute(ADMINS_ACL) != null &&
!userHasAdministratorAccess(servletContext, remoteUser)) {
response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "User "
+ remoteUser + " is unauthorized to access this page.");
return false;
}
return true;
}
/**
* Get the admin ACLs from the given ServletContext and check if the given
* user is in the ACL.
*
* @param servletContext the context containing the admin ACL.
* @param remoteUser the remote user to check for.
* @return true if the user is present in the ACL, false if no ACL is set or
* the user is not present
*/
public static boolean userHasAdministratorAccess(ServletContext servletContext,
String remoteUser) {
AccessControlList adminsAcl = (AccessControlList) servletContext
.getAttribute(ADMINS_ACL);
UserGroupInformation remoteUserUGI =
UserGroupInformation.createRemoteUser(remoteUser);
return adminsAcl != null && adminsAcl.isUserAllowed(remoteUserUGI);
}
/**
* A very simple servlet to serve up a text representation of the current
* stack traces. It both returns the stacks to the caller and logs them.
* Currently the stack traces are done sequentially rather than exactly the
* same data.
*/
public static class StackServlet extends HttpServlet {
private static final long serialVersionUID = -6284183679759467039L;
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
if (!HttpServer.isInstrumentationAccessAllowed(getServletContext(),
request, response)) {
return;
}
response.setContentType("text/plain; charset=UTF-8");
PrintWriter out = response.getWriter();
ReflectionUtils.printThreadInfo(out, "");
out.close();
ReflectionUtils.logThreadInfo(LOG, "jsp requested", 1);
}
}
/**
* A Servlet input filter that quotes all HTML active characters in the
* parameter names and values. The goal is to quote the characters to make
* all of the servlets resistant to cross-site scripting attacks.
*/
public static class QuotingInputFilter implements Filter {
private FilterConfig config;
public static class RequestQuoter extends HttpServletRequestWrapper {
private final HttpServletRequest rawRequest;
public RequestQuoter(HttpServletRequest rawRequest) {
super(rawRequest);
this.rawRequest = rawRequest;
}
/**
* Return the set of parameter names, quoting each name.
*/
@SuppressWarnings("unchecked")
@Override
public Enumeration getParameterNames() {
return new Enumeration() {
private Enumeration rawIterator =
rawRequest.getParameterNames();
@Override
public boolean hasMoreElements() {
return rawIterator.hasMoreElements();
}
@Override
public String nextElement() {
return HtmlQuoting.quoteHtmlChars(rawIterator.nextElement());
}
};
}
/**
* Unquote the name and quote the value.
*/
@Override
public String getParameter(String name) {
return HtmlQuoting.quoteHtmlChars(rawRequest.getParameter
(HtmlQuoting.unquoteHtmlChars(name)));
}
@Override
public String[] getParameterValues(String name) {
String unquoteName = HtmlQuoting.unquoteHtmlChars(name);
String[] unquoteValue = rawRequest.getParameterValues(unquoteName);
if (unquoteValue == null) {
return null;
}
String[] result = new String[unquoteValue.length];
for(int i=0; i < result.length; ++i) {
result[i] = HtmlQuoting.quoteHtmlChars(unquoteValue[i]);
}
return result;
}
@SuppressWarnings("unchecked")
@Override
public Map getParameterMap() {
Map result = new HashMap();
Map raw = rawRequest.getParameterMap();
for (Map.Entry item: raw.entrySet()) {
String[] rawValue = item.getValue();
String[] cookedValue = new String[rawValue.length];
for(int i=0; i< rawValue.length; ++i) {
cookedValue[i] = HtmlQuoting.quoteHtmlChars(rawValue[i]);
}
result.put(HtmlQuoting.quoteHtmlChars(item.getKey()), cookedValue);
}
return result;
}
/**
* Quote the url so that users specifying the HOST HTTP header
* can't inject attacks.
*/
@Override
public StringBuffer getRequestURL(){
String url = rawRequest.getRequestURL().toString();
return new StringBuffer(HtmlQuoting.quoteHtmlChars(url));
}
/**
* Quote the server name so that users specifying the HOST HTTP header
* can't inject attacks.
*/
@Override
public String getServerName() {
return HtmlQuoting.quoteHtmlChars(rawRequest.getServerName());
}
}
@Override
public void init(FilterConfig config) throws ServletException {
this.config = config;
}
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest request,
ServletResponse response,
FilterChain chain
) throws IOException, ServletException {
HttpServletRequestWrapper quoted =
new RequestQuoter((HttpServletRequest) request);
HttpServletResponse httpResponse = (HttpServletResponse) response;
String mime = inferMimeType(request);
if (mime == null) {
httpResponse.setContentType("text/plain; charset=utf-8");
} else if (mime.startsWith("text/html")) {
// HTML with unspecified encoding, we want to
// force HTML with utf-8 encoding
// This is to avoid the following security issue:
// http://openmya.hacker.jp/hasegawa/security/utf7cs.html
httpResponse.setContentType("text/html; charset=utf-8");
} else if (mime.startsWith("application/xml")) {
httpResponse.setContentType("text/xml; charset=utf-8");
}
chain.doFilter(quoted, httpResponse);
}
/**
* Infer the mime type for the response based on the extension of the request
* URI. Returns null if unknown.
*/
private String inferMimeType(ServletRequest request) {
String path = ((HttpServletRequest)request).getRequestURI();
ContextHandler.SContext sContext = (ContextHandler.SContext)config.getServletContext();
MimeTypes mimes = sContext.getContextHandler().getMimeTypes();
Buffer mimeBuffer = mimes.getMimeByExtension(path);
return (mimeBuffer == null) ? null : mimeBuffer.toString();
}
}
}
