org.apache.hadoop.http.HttpServer Maven / Gradle / Ivy
The newest version!
/**
* 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.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
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.http.AdminAuthorizedServlet;
import org.apache.hadoop.http.FilterContainer;
import org.apache.hadoop.http.FilterInitializer;
import org.apache.hadoop.http.HtmlQuoting;
import org.apache.hadoop.log.LogLevel;
import org.apache.hadoop.metrics.MetricsServlet;
import org.apache.hadoop.security.Krb5AndCertsSslSocketConnector;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.Krb5AndCertsSslSocketConnector.MODE;
import org.apache.hadoop.security.authorize.AccessControlList;
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;
/**
* 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";
static final String ADMINS_ACL = "admins.acl";
private AccessControlList adminsAcl;
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);
}
/**
* 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);
}
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf, AccessControlList adminsAcl)
throws IOException {
this(name, bindAddress, port, findPort, conf, adminsAcl, 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 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 {
webServer = new Server();
this.findPort = findPort;
this.adminsAcl = adminsAcl;
if(connector == null) {
listenerStartedExternally = false;
listener = createBaseListener(conf);
listener.setHost(bindAddress);
listener.setPort(port);
} 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 254).
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("WepAppsContext");
webAppContext.setContextPath("/");
webAppContext.setWar(appDir + "/" + name);
webAppContext.getServletContext().setAttribute(CONF_CONTEXT_ATTRIBUTE, conf);
webAppContext.getServletContext().setAttribute(ADMINS_ACL, adminsAcl);
webServer.addHandler(webAppContext);
addDefaultApps(contexts, appDir, conf);
defineFilter(webAppContext, "krb5Filter",
Krb5AndCertsSslSocketConnector.Krb5SslFilter.class.getName(),
null, null);
addGlobalFilter("safety", QuotingInputFilter.class.getName(), null);
final FilterInitializer[] initializers = getFilterInitializers(conf);
if (initializers != null) {
for(FilterInitializer c : initializers) {
c.initFilter(this, conf);
}
}
addDefaultServlets();
}
/**
* 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);
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, "/");
logContext.setDisplayName("logs");
setContextAttributes(logContext, conf);
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("conf", "/conf", ConfServlet.class);
}
public void addContext(Context ctxt, boolean isFiltered)
throws IOException {
webServer.addHandler(ctxt);
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 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 Kerberized
* 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, 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 filter to " + name);
ServletHandler handler = webAppContext.getServletHandler();
FilterMapping fmap = new FilterMapping();
fmap.setPathSpec(pathSpec);
fmap.setFilterName("krb5Filter");
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 needClientAuth whether client authentication is required
*/
public void addSslListener(InetSocketAddress addr, Configuration sslConf,
boolean needClientAuth) throws IOException {
addSslListener(addr, sslConf, needClientAuth, false);
}
/**
* 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
* @param needKrbAuth whether to allow kerberos auth
*/
public void addSslListener(InetSocketAddress addr, Configuration sslConf,
boolean needCertsAuth, boolean needKrbAuth) 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"));
}
Krb5AndCertsSslSocketConnector.MODE mode;
if(needCertsAuth && needKrbAuth)
mode = MODE.BOTH;
else if (!needCertsAuth && needKrbAuth)
mode = MODE.KRB;
else // Default to certificates
mode = MODE.CERTS;
SslSocketConnector sslListener = new Krb5AndCertsSslSocketConnector(mode);
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);
}
/**
* Start the server. Does not wait for the server to start.
*/
public void start() throws IOException {
try {
if(listenerStartedExternally) { // Expect that listener was started securely
if(listener.getLocalPort() == -1) // ... and verify
throw new Exception("Exepected webserver's listener to be started " +
"previously but wasn't");
// And skip all the port rolling issues.
webServer.start();
} else {
int port = 0;
int oriPort = listener.getPort(); // The original requested port
while (true) {
try {
port = webServer.getConnectors()[0].getLocalPort();
LOG.info("Port returned by webServer.getConnectors()[0]." +
"getLocalPort() before open() is "+ port +
". Opening the listener on " + oriPort);
listener.open();
port = listener.getLocalPort();
LOG.info("listener.getLocalPort() returned " + listener.getLocalPort() +
" webServer.getConnectors()[0].getLocalPort() returned " +
webServer.getConnectors()[0].getLocalPort());
//Workaround to handle the problem reported in HADOOP-4744
if (port < 0) {
Thread.sleep(100);
int numRetries = 1;
while (port < 0) {
LOG.warn("listener.getLocalPort returned " + port);
if (numRetries++ > MAX_RETRIES) {
throw new Exception(" listener.getLocalPort is returning " +
"less than 0 even after " +numRetries+" resets");
}
for (int i = 0; i < 2; i++) {
LOG.info("Retrying listener.getLocalPort()");
port = listener.getLocalPort();
if (port > 0) {
break;
}
Thread.sleep(200);
}
if (port > 0) {
break;
}
LOG.info("Bouncing the listener");
listener.close();
Thread.sleep(1000);
listener.setPort(oriPort == 0 ? 0 : (oriPort += 1));
listener.open();
Thread.sleep(100);
port = listener.getLocalPort();
}
} //Workaround end
LOG.info("Jetty bound to port " + port);
webServer.start();
break;
} catch (IOException ex) {
// if this is a bind exception,
// then try the next port number.
if (ex instanceof BindException) {
if (!findPort) {
BindException be = new BindException(
"Port in use: " + listener.getHost()
+ ":" + listener.getPort());
be.initCause(ex);
throw be;
}
} else {
LOG.info("HttpServer.start() threw a non Bind IOException");
throw ex;
}
} catch (MultiException ex) {
LOG.info("HttpServer.start() threw a MultiException");
throw ex;
}
listener.setPort((oriPort += 1));
}
}
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw new IOException("Problem starting http server", e);
}
}
/**
* stop the server
*/
public void stop() throws Exception {
listener.close();
webServer.stop();
}
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";
}
/**
* 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
* @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) {
return true;
}
AccessControlList adminsAcl = (AccessControlList) servletContext
.getAttribute(ADMINS_ACL);
UserGroupInformation remoteUserUGI =
UserGroupInformation.createRemoteUser(remoteUser);
if (adminsAcl != null) {
if (!adminsAcl.isUserAllowed(remoteUserUGI)) {
response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "User "
+ remoteUser + " is unauthorized to access this page. "
+ "AccessControlList for accessing this page : "
+ adminsAcl.toString());
return false;
}
}
return true;
}
/**
* 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 {
// Do the authorization
if (!HttpServer.hasAdministratorAccess(getServletContext(), request,
response)) {
return;
}
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);
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();
}
}
}