--- /dev/null
+/*
+ * Licensed 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.catalina.filters;
+
+import java.io.IOException;
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Date;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
+
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletRequestWrapper;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.juli.logging.Log;
+import org.apache.juli.logging.LogFactory;
+
+/**
+ * <p>
+ * Servlet filter to integrate "X-Forwarded-For" and "X-Forwarded-Proto" HTTP headers.
+ * </p>
+ * <p>
+ * Most of the design of this Servlet Filter is a port of <a
+ * href="http://httpd.apache.org/docs/trunk/mod/mod_remoteip.html">mod_remoteip</a>, this servlet filter replaces the apparent client remote
+ * IP address and hostname for the request with the IP address list presented by a proxy or a load balancer via a request headers (e.g.
+ * "X-Forwarded-For").
+ * </p>
+ * <p>
+ * Another feature of this servlet filter is to replace the apparent scheme (http/https) and server port with the scheme presented by a
+ * proxy or a load balancer via a request header (e.g. "X-Forwarded-Proto").
+ * </p>
+ * <p>
+ * This servlet filter proceeds as follows:
+ * </p>
+ * <p>
+ * If the incoming <code>request.getRemoteAddr()</code> matches the servlet filter's list of internal proxies :
+ * <ul>
+ * <li>Loop on the comma delimited list of IPs and hostnames passed by the preceding load balancer or proxy in the given request's Http
+ * header named <code>$remoteIPHeader</code> (default value <code>x-forwarded-for</code>). Values are processed in right-to-left order.</li>
+ * <li>For each ip/host of the list:
+ * <ul>
+ * <li>if it matches the internal proxies list, the ip/host is swallowed</li>
+ * <li>if it matches the trusted proxies list, the ip/host is added to the created proxies header</li>
+ * <li>otherwise, the ip/host is declared to be the remote ip and looping is stopped.</li>
+ * </ul>
+ * </li>
+ * <li>If the request http header named <code>$protocolHeader</code> (e.g. <code>x-forwarded-for</code>) equals to the value of
+ * <code>protocolHeaderHttpsValue</code> configuration parameter (default <code>https</code>) then <code>request.isSecure = true</code>,
+ * <code>request.scheme = https</code> and <code>request.serverPort = 443</code>. Note that 443 can be overwritten with the
+ * <code>$httpsServerPort</code> configuration parameter.</li>
+ * </ul>
+ * </p>
+ * <p>
+ * <strong>Configuration parameters:</strong>
+ * <table border="1">
+ * <tr>
+ * <th>XForwardedFilter property</th>
+ * <th>Description</th>
+ * <th>Equivalent mod_remoteip directive</th>
+ * <th>Format</th>
+ * <th>Default Value</th>
+ * </tr>
+ * <tr>
+ * <td>remoteIPHeader</td>
+ * <td>Name of the Http Header read by this servlet filter that holds the list of traversed IP addresses starting from the requesting client
+ * </td>
+ * <td>RemoteIPHeader</td>
+ * <td>Compliant http header name</td>
+ * <td>x-forwarded-for</td>
+ * </tr>
+ * <tr>
+ * <td>internalProxies</td>
+ * <td>List of internal proxies ip adress. If they appear in the <code>remoteIpHeader</code> value, they will be trusted and will not appear
+ * in the <code>proxiesHeader</code> value</td>
+ * <td>RemoteIPInternalProxy</td>
+ * <td>Comma delimited list of regular expressions (in the syntax supported by the {@link java.util.regex.Pattern} library)</td>
+ * <td>10\.\d{1,3}\.\d{1,3}\.\d{1,3}, 192\.168\.\d{1,3}\.\d{1,3}, 169\.254\.\d{1,3}\.\d{1,3}, 127\.\d{1,3}\.\d{1,3}\.\d{1,3} <br/>
+ * By default, 10/8, 192.168/16, 169.254/16 and 127/8 are allowed ; 172.16/12 has not been enabled by default because it is complex to
+ * describe with regular expressions</td>
+ * </tr>
+ * </tr>
+ * <tr>
+ * <td>proxiesHeader</td>
+ * <td>Name of the http header created by this servlet filter to hold the list of proxies that have been processed in the incoming
+ * <code>remoteIPHeader</code></td>
+ * <td>RemoteIPProxiesHeader</td>
+ * <td>Compliant http header name</td>
+ * <td>x-forwarded-by</td>
+ * </tr>
+ * <tr>
+ * <td>trustedProxies</td>
+ * <td>List of trusted proxies ip adress. If they appear in the <code>remoteIpHeader</code> value, they will be trusted and will appear in
+ * the <code>proxiesHeader</code> value</td>
+ * <td>RemoteIPTrustedProxy</td>
+ * <td>Comma delimited list of regular expressions (in the syntax supported by the {@link java.util.regex.Pattern} library)</td>
+ * <td> </td>
+ * </tr>
+ * <tr>
+ * <td>protocolHeader</td>
+ * <td>Name of the http header read by this servlet filter that holds the flag that this request</td>
+ * <td>N/A</td>
+ * <td>Compliant http header name like <code>X-Forwarded-Proto</code>, <code>X-Forwarded-Ssl</code> or <code>Front-End-Https</code></td>
+ * <td><code>null</code></td>
+ * </tr>
+ * <tr>
+ * <td>protocolHeaderHttpsValue</td>
+ * <td>Value of the <code>protocolHeader</code> to indicate that it is an Https request</td>
+ * <td>N/A</td>
+ * <td>String like <code>https</code> or <code>ON</code></td>
+ * <td><code>https</code></td>
+ * </tr>
+ * <tr>
+ * </table>
+ * </p>
+ * <p>
+ * <p>
+ * <strong>Regular expression vs. IP address blocks:</strong> <code>mod_remoteip</code> allows to use address blocks (e.g.
+ * <code>192.168/16</code>) to configure <code>RemoteIPInternalProxy</code> and <code>RemoteIPTrustedProxy</code> ; as the JVM doesnt have a
+ * library similar to <a
+ * href="http://apr.apache.org/docs/apr/1.3/group__apr__network__io.html#gb74d21b8898b7c40bf7fd07ad3eb993d">apr_ipsubnet_test</a>.
+ * </p>
+ * <hr/>
+ * <p>
+ * <strong>Sample with internal proxies</strong>
+ * </p>
+ * <p>
+ * XForwardedFilter configuration:
+ * </p>
+ * <code><pre>
+ * <filter>
+ * <filter-name>XForwardedFilter</filter-name>
+ * <filter-class>fr.xebia.servlet.filter.XForwardedFilter</filter-class>
+ * <init-param>
+ * <param-name>internalProxies</param-name><param-value>192\.168\.0\.10, 192\.168\.0\.11</param-value>
+ * </init-param>
+ * <init-param>
+ * <param-name>remoteIPHeader</param-name><param-value>x-forwarded-for</param-value>
+ * </init-param>
+ * <init-param>
+ * <param-name>remoteIPProxiesHeader</param-name><param-value>x-forwarded-by</param-value>
+ * </init-param>
+ * <init-param>
+ * <param-name>protocolHeader</param-name><param-value>x-forwarded-proto</param-value>
+ * </init-param>
+ * </filter>
+ *
+ * <filter-mapping>
+ * <filter-name>XForwardedFilter</filter-name>
+ * <url-pattern>/*</url-pattern>
+ * <dispatcher>REQUEST</dispatcher>
+ * </filter-mapping></pre></code>
+ * <p>
+ * Request values:
+ * <table border="1">
+ * <tr>
+ * <th>property</th>
+ * <th>Value Before XForwardedFilter</th>
+ * <th>Value After XForwardedFilter</th>
+ * </tr>
+ * <tr>
+ * <td>request.remoteAddr</td>
+ * <td>192.168.0.10</td>
+ * <td>140.211.11.130</td>
+ * </tr>
+ * <tr>
+ * <td>request.header['x-forwarded-for']</td>
+ * <td>140.211.11.130, 192.168.0.10</td>
+ * <td>null</td>
+ * </tr>
+ * <tr>
+ * <td>request.header['x-forwarded-by']</td>
+ * <td>null</td>
+ * <td>null</td>
+ * </tr>
+ * <tr>
+ * <td>request.header['x-forwarded-proto']</td>
+ * <td>https</td>
+ * <td>https</td>
+ * </tr>
+ * <tr>
+ * <td>request.scheme</td>
+ * <td>http</td>
+ * <td>https</td>
+ * </tr>
+ * <tr>
+ * <td>request.secure</td>
+ * <td>false</td>
+ * <td>true</td>
+ * </tr>
+ * <tr>
+ * <td>request.serverPort</td>
+ * <td>80</td>
+ * <td>443</td>
+ * </tr>
+ * </table>
+ * Note : <code>x-forwarded-by</code> header is null because only internal proxies as been traversed by the request.
+ * <code>x-forwarded-by</code> is null because all the proxies are trusted or internal.
+ * </p>
+ * <hr/>
+ * <p>
+ * <strong>Sample with trusted proxies</strong>
+ * </p>
+ * <p>
+ * XForwardedFilter configuration:
+ * </p>
+ * <code><pre>
+ * <filter>
+ * <filter-name>XForwardedFilter</filter-name>
+ * <filter-class>fr.xebia.servlet.filter.XForwardedFilter</filter-class>
+ * <init-param>
+ * <param-name>internalProxies</param-name><param-value>192\.168\.0\.10, 192\.168\.0\.11</param-value>
+ * </init-param>
+ * <init-param>
+ * <param-name>remoteIPHeader</param-name><param-value>x-forwarded-for</param-value>
+ * </init-param>
+ * <init-param>
+ * <param-name>remoteIPProxiesHeader</param-name><param-value>x-forwarded-by</param-value>
+ * </init-param>
+ * <init-param>
+ * <param-name>trustedProxies</param-name><param-value>proxy1, proxy2</param-value>
+ * </init-param>
+ * </filter>
+ *
+ * <filter-mapping>
+ * <filter-name>XForwardedFilter</filter-name>
+ * <url-pattern>/*</url-pattern>
+ * <dispatcher>REQUEST</dispatcher>
+ * </filter-mapping></pre></code>
+ * <p>
+ * Request values:
+ * <table border="1">
+ * <tr>
+ * <th>property</th>
+ * <th>Value Before XForwardedFilter</th>
+ * <th>Value After XForwardedFilter</th>
+ * </tr>
+ * <tr>
+ * <td>request.remoteAddr</td>
+ * <td>192.168.0.10</td>
+ * <td>140.211.11.130</td>
+ * </tr>
+ * <tr>
+ * <td>request.header['x-forwarded-for']</td>
+ * <td>140.211.11.130, proxy1, proxy2</td>
+ * <td>null</td>
+ * </tr>
+ * <tr>
+ * <td>request.header['x-forwarded-by']</td>
+ * <td>null</td>
+ * <td>proxy1, proxy2</td>
+ * </tr>
+ * </table>
+ * Note : <code>proxy1</code> and <code>proxy2</code> are both trusted proxies that come in <code>x-forwarded-for</code> header, they both
+ * are migrated in <code>x-forwarded-by</code> header. <code>x-forwarded-by</code> is null because all the proxies are trusted or internal.
+ * </p>
+ * <hr/>
+ * <p>
+ * <strong>Sample with internal and trusted proxies</strong>
+ * </p>
+ * <p>
+ * XForwardedFilter configuration:
+ * </p>
+ * <code><pre>
+ * <filter>
+ * <filter-name>XForwardedFilter</filter-name>
+ * <filter-class>fr.xebia.servlet.filter.XForwardedFilter</filter-class>
+ * <init-param>
+ * <param-name>internalProxies</param-name><param-value>192\.168\.0\.10, 192\.168\.0\.11</param-value>
+ * </init-param>
+ * <init-param>
+ * <param-name>remoteIPHeader</param-name><param-value>x-forwarded-for</param-value>
+ * </init-param>
+ * <init-param>
+ * <param-name>remoteIPProxiesHeader</param-name><param-value>x-forwarded-by</param-value>
+ * </init-param>
+ * <init-param>
+ * <param-name>trustedProxies</param-name><param-value>proxy1, proxy2</param-value>
+ * </init-param>
+ * </filter>
+ *
+ * <filter-mapping>
+ * <filter-name>XForwardedFilter</filter-name>
+ * <url-pattern>/*</url-pattern>
+ * <dispatcher>REQUEST</dispatcher>
+ * </filter-mapping></pre></code>
+ * <p>
+ * Request values:
+ * <table border="1">
+ * <tr>
+ * <th>property</th>
+ * <th>Value Before XForwardedFilter</th>
+ * <th>Value After XForwardedFilter</th>
+ * </tr>
+ * <tr>
+ * <td>request.remoteAddr</td>
+ * <td>192.168.0.10</td>
+ * <td>140.211.11.130</td>
+ * </tr>
+ * <tr>
+ * <td>request.header['x-forwarded-for']</td>
+ * <td>140.211.11.130, proxy1, proxy2, 192.168.0.10</td>
+ * <td>null</td>
+ * </tr>
+ * <tr>
+ * <td>request.header['x-forwarded-by']</td>
+ * <td>null</td>
+ * <td>proxy1, proxy2</td>
+ * </tr>
+ * </table>
+ * Note : <code>proxy1</code> and <code>proxy2</code> are both trusted proxies that come in <code>x-forwarded-for</code> header, they both
+ * are migrated in <code>x-forwarded-by</code> header. As <code>192.168.0.10</code> is an internal proxy, it does not appear in
+ * <code>x-forwarded-by</code>. <code>x-forwarded-by</code> is null because all the proxies are trusted or internal.
+ * </p>
+ * <hr/>
+ * <p>
+ * <strong>Sample with an untrusted proxy</strong>
+ * </p>
+ * <p>
+ * XForwardedFilter configuration:
+ * </p>
+ * <code><pre>
+ * <filter>
+ * <filter-name>XForwardedFilter</filter-name>
+ * <filter-class>fr.xebia.servlet.filter.XForwardedFilter</filter-class>
+ * <init-param>
+ * <param-name>internalProxies</param-name><param-value>192\.168\.0\.10, 192\.168\.0\.11</param-value>
+ * </init-param>
+ * <init-param>
+ * <param-name>remoteIPHeader</param-name><param-value>x-forwarded-for</param-value>
+ * </init-param>
+ * <init-param>
+ * <param-name>remoteIPProxiesHeader</param-name><param-value>x-forwarded-by</param-value>
+ * </init-param>
+ * <init-param>
+ * <param-name>trustedProxies</param-name><param-value>proxy1, proxy2</param-value>
+ * </init-param>
+ * </filter>
+ *
+ * <filter-mapping>
+ * <filter-name>XForwardedFilter</filter-name>
+ * <url-pattern>/*</url-pattern>
+ * <dispatcher>REQUEST</dispatcher>
+ * </filter-mapping></pre></code>
+ * <p>
+ * Request values:
+ * <table border="1">
+ * <tr>
+ * <th>property</th>
+ * <th>Value Before XForwardedFilter</th>
+ * <th>Value After XForwardedFilter</th>
+ * </tr>
+ * <tr>
+ * <td>request.remoteAddr</td>
+ * <td>192.168.0.10</td>
+ * <td>untrusted-proxy</td>
+ * </tr>
+ * <tr>
+ * <td>request.header['x-forwarded-for']</td>
+ * <td>140.211.11.130, untrusted-proxy, proxy1</td>
+ * <td>140.211.11.130</td>
+ * </tr>
+ * <tr>
+ * <td>request.header['x-forwarded-by']</td>
+ * <td>null</td>
+ * <td>proxy1</td>
+ * </tr>
+ * </table>
+ * Note : <code>x-forwarded-by</code> holds the trusted proxy <code>proxy1</code>. <code>x-forwarded-by</code> holds
+ * <code>140.211.11.130</code> because <code>untrusted-proxy</code> is not trusted and thus, we can not trust that
+ * <code>untrusted-proxy</code> is the actual remote ip. <code>request.remoteAddr</code> is <code>untrusted-proxy</code> that is an IP
+ * verified by <code>proxy1</code>.
+ * </p>
+ * <hr/>
+ */
+public class RemoteIpFilter implements Filter {
+ public static class XForwardedRequest extends HttpServletRequestWrapper {
+
+ final static ThreadLocal<SimpleDateFormat[]> threadLocalDateFormats = new ThreadLocal<SimpleDateFormat[]>() {
+ @Override
+ protected SimpleDateFormat[] initialValue() {
+ return new SimpleDateFormat[] {
+ new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US),
+ new SimpleDateFormat("EEEEEE, dd-MMM-yy HH:mm:ss zzz", Locale.US),
+ new SimpleDateFormat("EEE MMMM d HH:mm:ss yyyy", Locale.US)
+ };
+
+ }
+ };
+
+ protected Map<String, List<String>> headers;
+
+ protected String remoteAddr;
+
+ protected String remoteHost;
+
+ protected String scheme;
+
+ protected boolean secure;
+
+ protected int serverPort;
+
+ public XForwardedRequest(HttpServletRequest request) {
+ super(request);
+ this.remoteAddr = request.getRemoteAddr();
+ this.remoteHost = request.getRemoteHost();
+ this.scheme = request.getScheme();
+ this.secure = request.isSecure();
+ this.serverPort = request.getServerPort();
+
+ headers = new HashMap<String, List<String>>();
+ for (Enumeration<String> headerNames = request.getHeaderNames(); headerNames.hasMoreElements();) {
+ String header = headerNames.nextElement();
+ headers.put(header, Collections.list(request.getHeaders(header)));
+ }
+ }
+
+ @Override
+ public long getDateHeader(String name) {
+ String value = getHeader(name);
+ if (value == null) {
+ return -1;
+ }
+ DateFormat[] dateFormats = threadLocalDateFormats.get();
+ Date date = null;
+ for (int i = 0; ((i < dateFormats.length) && (date == null)); i++) {
+ DateFormat dateFormat = dateFormats[i];
+ try {
+ date = dateFormat.parse(value);
+ } catch (Exception ParseException) {
+ // Ignore
+ }
+ }
+ if (date == null) {
+ throw new IllegalArgumentException(value);
+ } else {
+ return date.getTime();
+ }
+ }
+
+ @Override
+ public String getHeader(String name) {
+ Map.Entry<String, List<String>> header = getHeaderEntry(name);
+ if (header == null || header.getValue() == null || header.getValue().isEmpty()) {
+ return null;
+ } else {
+ return header.getValue().get(0);
+ }
+ }
+
+ protected Map.Entry<String, List<String>> getHeaderEntry(String name) {
+ for (Map.Entry<String, List<String>> entry : headers.entrySet()) {
+ if (entry.getKey().equalsIgnoreCase(name)) {
+ return entry;
+ }
+ }
+ return null;
+ }
+
+ @Override
+ public Enumeration<String> getHeaderNames() {
+ return Collections.enumeration(headers.keySet());
+ }
+
+ @Override
+ public Enumeration<String> getHeaders(String name) {
+ Map.Entry<String, List<String>> header = getHeaderEntry(name);
+ if (header == null || header.getValue() == null) {
+ return Collections.enumeration(Collections.<String>emptyList());
+ } else {
+ return Collections.enumeration(header.getValue());
+ }
+ }
+
+ @Override
+ public int getIntHeader(String name) {
+ String value = getHeader(name);
+ if (value == null) {
+ return -1;
+ } else {
+ return Integer.parseInt(value);
+ }
+ }
+
+ @Override
+ public String getRemoteAddr() {
+ return this.remoteAddr;
+ }
+
+ @Override
+ public String getRemoteHost() {
+ return this.remoteHost;
+ }
+
+ @Override
+ public String getScheme() {
+ return scheme;
+ }
+
+ @Override
+ public int getServerPort() {
+ return serverPort;
+ }
+
+ @Override
+ public boolean isSecure() {
+ return secure;
+ }
+
+ public void removeHeader(String name) {
+ Map.Entry<String, List<String>> header = getHeaderEntry(name);
+ if (header != null) {
+ headers.remove(header.getKey());
+ }
+ }
+
+ public void setHeader(String name, String value) {
+ List<String> values = Arrays.asList(value);
+ Map.Entry<String, List<String>> header = getHeaderEntry(name);
+ if (header == null) {
+ headers.put(name, values);
+ } else {
+ header.setValue(values);
+ }
+
+ }
+
+ public void setRemoteAddr(String remoteAddr) {
+ this.remoteAddr = remoteAddr;
+ }
+
+ public void setRemoteHost(String remoteHost) {
+ this.remoteHost = remoteHost;
+ }
+
+ public void setScheme(String scheme) {
+ this.scheme = scheme;
+ }
+
+ public void setSecure(boolean secure) {
+ this.secure = secure;
+ }
+
+ public void setServerPort(int serverPort) {
+ this.serverPort = serverPort;
+ }
+ }
+
+ /**
+ * {@link Pattern} for a comma delimited string that support whitespace characters
+ */
+ private static final Pattern commaSeparatedValuesPattern = Pattern.compile("\\s*,\\s*");
+
+ protected static final String HTTPS_SERVER_PORT_PARAMETER = "httpsServerPort";
+
+ protected static final String INTERNAL_PROXIES_PARAMETER = "allowedInternalProxies";
+
+ /**
+ * Logger
+ */
+ private static Log log = LogFactory.getLog(RemoteIpFilter.class);
+
+ protected static final String PROTOCOL_HEADER_PARAMETER = "protocolHeader";
+
+ protected static final String PROTOCOL_HEADER_SSL_VALUE_PARAMETER = "protocolHeaderSslValue";
+
+ protected static final String PROXIES_HEADER_PARAMETER = "proxiesHeader";
+
+ protected static final String REMOTE_IP_HEADER_PARAMETER = "remoteIPHeader";
+
+ protected static final String TRUSTED_PROXIES_PARAMETER = "trustedProxies";
+
+ /**
+ * Convert a given comma delimited list of regular expressions into an array of compiled {@link Pattern}
+ *
+ * @return array of patterns (not <code>null</code>)
+ */
+ protected static Pattern[] commaDelimitedListToPatternArray(String commaDelimitedPatterns) {
+ String[] patterns = commaDelimitedListToStringArray(commaDelimitedPatterns);
+ List<Pattern> patternsList = new ArrayList<Pattern>();
+ for (String pattern : patterns) {
+ try {
+ patternsList.add(Pattern.compile(pattern));
+ } catch (PatternSyntaxException e) {
+ throw new IllegalArgumentException("Illegal pattern syntax '" + pattern + "'", e);
+ }
+ }
+ return patternsList.toArray(new Pattern[0]);
+ }
+
+ /**
+ * Convert a given comma delimited list of regular expressions into an array of String
+ *
+ * @return array of patterns (non <code>null</code>)
+ */
+ protected static String[] commaDelimitedListToStringArray(String commaDelimitedStrings) {
+ return (commaDelimitedStrings == null || commaDelimitedStrings.length() == 0) ? new String[0] : commaSeparatedValuesPattern
+ .split(commaDelimitedStrings);
+ }
+
+ /**
+ * Convert an array of strings in a comma delimited string
+ */
+ protected static String listToCommaDelimitedString(List<String> stringList) {
+ if (stringList == null) {
+ return "";
+ }
+ StringBuilder result = new StringBuilder();
+ for (Iterator<String> it = stringList.iterator(); it.hasNext();) {
+ Object element = it.next();
+ if (element != null) {
+ result.append(element);
+ if (it.hasNext()) {
+ result.append(", ");
+ }
+ }
+ }
+ return result.toString();
+ }
+
+ /**
+ * Return <code>true</code> if the given <code>str</code> matches at least one of the given <code>patterns</code>.
+ */
+ protected static boolean matchesOne(String str, Pattern... patterns) {
+ for (Pattern pattern : patterns) {
+ if (pattern.matcher(str).matches()) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * @see #setHttpsServerPort(int)
+ */
+ private int httpsServerPort = 443;
+
+ /**
+ * @see #setInternalProxies(String)
+ */
+ private Pattern[] internalProxies = new Pattern[] {
+ Pattern.compile("10\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}"), Pattern.compile("192\\.168\\.\\d{1,3}\\.\\d{1,3}"),
+ Pattern.compile("169\\.254\\.\\d{1,3}\\.\\d{1,3}"), Pattern.compile("127\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}")
+ };
+
+ /**
+ * @see #setProtocolHeader(String)
+ */
+ private String protocolHeader = null;
+
+ private String protocolHeaderSslValue = "https";
+
+ /**
+ * @see #setProxiesHeader(String)
+ */
+ private String proxiesHeader = "X-Forwarded-By";
+
+ /**
+ * @see #setRemoteIPHeader(String)
+ */
+ private String remoteIPHeader = "X-Forwarded-For";
+
+ /**
+ * @see #setTrustedProxies(String)
+ */
+ private Pattern[] trustedProxies = new Pattern[0];
+
+ public void destroy() {
+ // NOOP
+ }
+
+ public void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
+
+ if (matchesOne(request.getRemoteAddr(), internalProxies)) {
+ String remoteIp = null;
+ // In java 6, proxiesHeaderValue should be declared as a java.util.Deque
+ LinkedList<String> proxiesHeaderValue = new LinkedList<String>();
+
+ String[] remoteIPHeaderValue = commaDelimitedListToStringArray(request.getHeader(remoteIPHeader));
+ int idx;
+ // loop on remoteIPHeaderValue to find the first trusted remote ip and to build the proxies chain
+ for (idx = remoteIPHeaderValue.length - 1; idx >= 0; idx--) {
+ String currentRemoteIp = remoteIPHeaderValue[idx];
+ remoteIp = currentRemoteIp;
+ if (matchesOne(currentRemoteIp, internalProxies)) {
+ // do nothing, internalProxies IPs are not appended to the
+ } else if (matchesOne(currentRemoteIp, trustedProxies)) {
+ proxiesHeaderValue.addFirst(currentRemoteIp);
+ } else {
+ idx--; // decrement idx because break statement doesn't do it
+ break;
+ }
+ }
+ // continue to loop on remoteIPHeaderValue to build the new value of the remoteIPHeader
+ LinkedList<String> newRemoteIpHeaderValue = new LinkedList<String>();
+ for (; idx >= 0; idx--) {
+ String currentRemoteIp = remoteIPHeaderValue[idx];
+ newRemoteIpHeaderValue.addFirst(currentRemoteIp);
+ }
+
+ XForwardedRequest xRequest = new XForwardedRequest(request);
+ if (remoteIp != null) {
+
+ xRequest.setRemoteAddr(remoteIp);
+ xRequest.setRemoteHost(remoteIp);
+
+ if (proxiesHeaderValue.size() == 0) {
+ xRequest.removeHeader(proxiesHeader);
+ } else {
+ String commaDelimitedListOfProxies = listToCommaDelimitedString(proxiesHeaderValue);
+ xRequest.setHeader(proxiesHeader, commaDelimitedListOfProxies);
+ }
+ if (newRemoteIpHeaderValue.size() == 0) {
+ xRequest.removeHeader(remoteIPHeader);
+ } else {
+ String commaDelimitedRemoteIpHeaderValue = listToCommaDelimitedString(newRemoteIpHeaderValue);
+ xRequest.setHeader(remoteIPHeader, commaDelimitedRemoteIpHeaderValue);
+ }
+ }
+
+ if (protocolHeader != null) {
+ String protocolHeaderValue = request.getHeader(protocolHeader);
+ if (protocolHeaderValue != null && protocolHeaderSslValue.equalsIgnoreCase(protocolHeaderValue)) {
+ xRequest.setSecure(true);
+ xRequest.setScheme("https");
+ xRequest.setServerPort(httpsServerPort);
+ }
+ }
+
+ if (log.isDebugEnabled()) {
+ log.debug("Incoming request " + request.getRequestURI() + " with originalRemoteAddr '" + request.getRemoteAddr()
+ + "', originalRemoteHost='" + request.getRemoteHost() + "', originalSecure='" + request.isSecure()
+ + "', originalScheme='" + request.getScheme() + "', original[" + remoteIPHeader + "]='"
+ + request.getHeader(remoteIPHeader) + ", original[" + protocolHeader + "]='"
+ + request.getHeader(protocolHeader) + "' will be seen as newRemoteAddr='" + xRequest.getRemoteAddr()
+ + "', newRemoteHost='" + xRequest.getRemoteHost() + "', newScheme='" + xRequest.getScheme() + "', newSecure='"
+ + xRequest.isSecure() + "', new[" + remoteIPHeader + "]='" + xRequest.getHeader(remoteIPHeader) + ", new["
+ + proxiesHeader + "]='" + xRequest.getHeader(proxiesHeader) + "'");
+ }
+ chain.doFilter(xRequest, response);
+ } else {
+ chain.doFilter(request, response);
+ }
+
+ }
+
+ /**
+ * Wrap the incoming <code>request</code> in a {@link XForwardedRequest} if the http header <code>x-forwareded-for</code> is not empty.
+ */
+ public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
+ if (request instanceof HttpServletRequest && response instanceof HttpServletResponse) {
+ doFilter((HttpServletRequest)request, (HttpServletResponse)response, chain);
+ } else {
+ chain.doFilter(request, response);
+ }
+ }
+
+ public int getHttpsServerPort() {
+ return httpsServerPort;
+ }
+
+ public Pattern[] getInternalProxies() {
+ return internalProxies;
+ }
+
+ public String getProtocolHeader() {
+ return protocolHeader;
+ }
+
+ public String getProtocolHeaderSslValue() {
+ return protocolHeaderSslValue;
+ }
+
+ public String getProxiesHeader() {
+ return proxiesHeader;
+ }
+
+ public String getRemoteIPHeader() {
+ return remoteIPHeader;
+ }
+
+ public Pattern[] getTrustedProxies() {
+ return trustedProxies;
+ }
+
+ public void init(FilterConfig filterConfig) throws ServletException {
+ if (filterConfig.getInitParameter(INTERNAL_PROXIES_PARAMETER) != null) {
+ setInternalProxies(filterConfig.getInitParameter(INTERNAL_PROXIES_PARAMETER));
+ }
+
+ if (filterConfig.getInitParameter(PROTOCOL_HEADER_PARAMETER) != null) {
+ setProtocolHeader(filterConfig.getInitParameter(PROTOCOL_HEADER_PARAMETER));
+ }
+
+ if (filterConfig.getInitParameter(PROTOCOL_HEADER_SSL_VALUE_PARAMETER) != null) {
+ setProtocolHeaderSslValue(filterConfig.getInitParameter(PROTOCOL_HEADER_SSL_VALUE_PARAMETER));
+ }
+
+ if (filterConfig.getInitParameter(PROXIES_HEADER_PARAMETER) != null) {
+ setProxiesHeader(filterConfig.getInitParameter(PROXIES_HEADER_PARAMETER));
+ }
+
+ if (filterConfig.getInitParameter(REMOTE_IP_HEADER_PARAMETER) != null) {
+ setRemoteIPHeader(filterConfig.getInitParameter(REMOTE_IP_HEADER_PARAMETER));
+ }
+
+ if (filterConfig.getInitParameter(TRUSTED_PROXIES_PARAMETER) != null) {
+ setTrustedProxies(filterConfig.getInitParameter(TRUSTED_PROXIES_PARAMETER));
+ }
+
+ if (filterConfig.getInitParameter(HTTPS_SERVER_PORT_PARAMETER) != null) {
+ try {
+ setHttpsServerPort(Integer.parseInt(filterConfig.getInitParameter(HTTPS_SERVER_PORT_PARAMETER)));
+ } catch (NumberFormatException e) {
+ throw new NumberFormatException("Illegal serverPort : " + e.getMessage());
+ }
+ }
+ }
+
+ /**
+ * <p>
+ * Server Port value if the {@link #protocolHeader} indicates HTTPS
+ * </p>
+ * <p>
+ * Default value : 443
+ * </p>
+ */
+ public void setHttpsServerPort(int httpsServerPort) {
+ this.httpsServerPort = httpsServerPort;
+ }
+
+ /**
+ * <p>
+ * Comma delimited list of internal proxies. Can be expressed with regular expressions.
+ * </p>
+ * <p>
+ * Default value : 10\.\d{1,3}\.\d{1,3}\.\d{1,3}, 192\.168\.\d{1,3}\.\d{1,3}, 127\.\d{1,3}\.\d{1,3}\.\d{1,3}
+ * </p>
+ */
+ public void setInternalProxies(String internalProxies) {
+ this.internalProxies = commaDelimitedListToPatternArray(internalProxies);
+ }
+
+ /**
+ * <p>
+ * Header that holds the incoming protocol, usally named <code>X-Forwarded-Proto</code>. If <code>null</code>, request.scheme and
+ * request.secure will not be modified.
+ * </p>
+ * <p>
+ * Default value : <code>null</code>
+ * </p>
+ */
+ public void setProtocolHeader(String protocolHeader) {
+ this.protocolHeader = protocolHeader;
+ }
+
+ /**
+ * <p>
+ * Case insensitive value of the protocol header to indicate that the incoming http request uses SSL.
+ * </p>
+ * <p>
+ * Default value : <code>HTTPS</code>
+ * </p>
+ */
+ public void setProtocolHeaderSslValue(String protocolHeaderSslValue) {
+ this.protocolHeaderSslValue = protocolHeaderSslValue;
+ }
+
+ /**
+ * <p>
+ * The proxiesHeader directive specifies a header into which mod_remoteip will collect a list of all of the intermediate client IP
+ * addresses trusted to resolve the actual remote IP. Note that intermediate RemoteIPTrustedProxy addresses are recorded in this header,
+ * while any intermediate RemoteIPInternalProxy addresses are discarded.
+ * </p>
+ * <p>
+ * Name of the http header that holds the list of trusted proxies that has been traversed by the http request.
+ * </p>
+ * <p>
+ * The value of this header can be comma delimited.
+ * </p>
+ * <p>
+ * Default value : <code>X-Forwarded-By</code>
+ * </p>
+ */
+ public void setProxiesHeader(String proxiesHeader) {
+ this.proxiesHeader = proxiesHeader;
+ }
+
+ /**
+ * <p>
+ * Name of the http header from which the remote ip is extracted.
+ * </p>
+ * <p>
+ * The value of this header can be comma delimited.
+ * </p>
+ * <p>
+ * Default value : <code>X-Forwarded-For</code>
+ * </p>
+ */
+ public void setRemoteIPHeader(String remoteIPHeader) {
+ this.remoteIPHeader = remoteIPHeader;
+ }
+
+ /**
+ * <p>
+ * Comma delimited list of proxies that are trusted when they appear in the {@link #remoteIPHeader} header. Can be expressed as a
+ * regular expression.
+ * </p>
+ * <p>
+ * Default value : empty list, no external proxy is trusted.
+ * </p>
+ */
+ public void setTrustedProxies(String trustedProxies) {
+ this.trustedProxies = commaDelimitedListToPatternArray(trustedProxies);
+ }
+}
projects / tomcat7.0 / commitdiff