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Add removeOnly mode to ForwardedHeaderFilter

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Issue: SPR-15610
This commit is contained in:
Rossen Stoyanchev
2017-06-01 15:39:19 -04:00
parent cf1bc81199
commit 895fa2ea7b
2 changed files with 115 additions and 50 deletions
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136
spring-web/src/main/java/org/springframework/web/filter/ForwardedHeaderFilter.java
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@@ -40,20 +40,25 @@ import org.springframework.web.util.UriComponentsBuilder;
import org.springframework.web.util.UrlPathHelper;
/**
* Filter that wraps the request and response in order to override its
* Extract values from "Forwarded" and "X-Forwarded-*" headers in order to wrap
* and override the following from the request and response:
* {@link HttpServletRequest#getServerName() getServerName()},
* {@link HttpServletRequest#getServerPort() getServerPort()},
* {@link HttpServletRequest#getScheme() getScheme()},
* {@link HttpServletRequest#isSecure() isSecure()},
* {@link HttpServletResponse#sendRedirect(String) sendRedirect(String)},
* methods with values derived from "Forwarded" or "X-Forwarded-*"
* headers. In effect the wrapped request and response reflects the
* client-originated protocol and address.
* {@link HttpServletRequest#isSecure() isSecure()}, and
* {@link HttpServletResponse#sendRedirect(String) sendRedirect(String)}.
* In effect the wrapped request and response reflect the client-originated
* protocol and address.
*
* <p><strong>Note:</strong> This filter can also be used in a
* {@link #setRemoveOnly removeOnly} mode where "Forwarded" and "X-Forwarded-*"
* headers are only eliminated without being used.
*
* @author Rossen Stoyanchev
* @author Eddú Meléndez
* @author Rob Winch
* @since 4.3
* @see <a href="https://tools.ietf.org/html/rfc7239">https://tools.ietf.org/html/rfc7239</a>
*/
public class ForwardedHeaderFilter extends OncePerRequestFilter {
@@ -71,6 +76,8 @@ public class ForwardedHeaderFilter extends OncePerRequestFilter {
private final UrlPathHelper pathHelper;
private boolean removeOnly;
public ForwardedHeaderFilter() {
this.pathHelper = new UrlPathHelper();
@@ -79,6 +86,17 @@ public class ForwardedHeaderFilter extends OncePerRequestFilter {
}
/**
* Enables mode in which any "Forwarded" or "X-Forwarded-*" headers are
* removed only and the information in them ignored.
* @param removeOnly whether to discard and ingore forwarded headers
* @since 4.3.9
*/
public void setRemoveOnly(boolean removeOnly) {
this.removeOnly = removeOnly;
}
@Override
protected boolean shouldNotFilter(HttpServletRequest request) throws ServletException {
Enumeration<String> names = request.getHeaderNames();
@@ -105,13 +123,67 @@ public class ForwardedHeaderFilter extends OncePerRequestFilter {
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
FilterChain filterChain) throws ServletException, IOException {
ForwardedHeaderRequestWrapper wrappedRequest = new ForwardedHeaderRequestWrapper(request, this.pathHelper);
ForwardedHeaderResponseWrapper wrappedResponse = new ForwardedHeaderResponseWrapper(response, wrappedRequest);
filterChain.doFilter(wrappedRequest, wrappedResponse);
if (this.removeOnly) {
ForwardedHeaderRemovingRequest theRequest = new ForwardedHeaderRemovingRequest(request);
filterChain.doFilter(theRequest, response);
}
else {
HttpServletRequest theRequest = new ForwardedHeaderExtractingRequest(request, this.pathHelper);
HttpServletResponse theResponse = new ForwardedHeaderExtractingResponse(response, theRequest);
filterChain.doFilter(theRequest, theResponse);
}
}
private static class ForwardedHeaderRequestWrapper extends HttpServletRequestWrapper {
/**
* Hide "Forwarded" or "X-Forwarded-*" headers.
*/
private static class ForwardedHeaderRemovingRequest extends HttpServletRequestWrapper {
private final Map<String, List<String>> headers;
public ForwardedHeaderRemovingRequest(HttpServletRequest request) {
super(request);
this.headers = initHeaders(request);
}
private static Map<String, List<String>> initHeaders(HttpServletRequest request) {
Map<String, List<String>> headers = new LinkedCaseInsensitiveMap<>(Locale.ENGLISH);
Enumeration<String> names = request.getHeaderNames();
while (names.hasMoreElements()) {
String name = names.nextElement();
if (!FORWARDED_HEADER_NAMES.contains(name)) {
headers.put(name, Collections.list(request.getHeaders(name)));
}
}
return headers;
}
// Override header accessors to not expose forwarded headers
@Override
public String getHeader(String name) {
List<String> value = this.headers.get(name);
return (CollectionUtils.isEmpty(value) ? null : value.get(0));
}
@Override
public Enumeration<String> getHeaders(String name) {
List<String> value = this.headers.get(name);
return (Collections.enumeration(value != null ? value : Collections.emptySet()));
}
@Override
public Enumeration<String> getHeaderNames() {
return Collections.enumeration(this.headers.keySet());
}
}
/**
* Extract and use "Forwarded" or "X-Forwarded-*" headers.
*/
private static class ForwardedHeaderExtractingRequest extends ForwardedHeaderRemovingRequest {
private final String scheme;
@@ -127,9 +199,8 @@ public class ForwardedHeaderFilter extends OncePerRequestFilter {
private final String requestUrl;
private final Map<String, List<String>> headers;
public ForwardedHeaderRequestWrapper(HttpServletRequest request, UrlPathHelper pathHelper) {
public ForwardedHeaderExtractingRequest(HttpServletRequest request, UrlPathHelper pathHelper) {
super(request);
HttpRequest httpRequest = new ServletServerHttpRequest(request);
@@ -145,7 +216,6 @@ public class ForwardedHeaderFilter extends OncePerRequestFilter {
this.contextPath = (prefix != null ? prefix : request.getContextPath());
this.requestUri = this.contextPath + pathHelper.getPathWithinApplication(request);
this.requestUrl = this.scheme + "://" + this.host + (port == -1 ? "" : ":" + port) + this.requestUri;
this.headers = initHeaders(request);
}
private static String getForwardedPrefix(HttpServletRequest request) {
@@ -165,21 +235,6 @@ public class ForwardedHeaderFilter extends OncePerRequestFilter {
return prefix;
}
/**
* Copy the headers excluding any {@link #FORWARDED_HEADER_NAMES}.
*/
private static Map<String, List<String>> initHeaders(HttpServletRequest request) {
Map<String, List<String>> headers = new LinkedCaseInsensitiveMap<>(Locale.ENGLISH);
Enumeration<String> names = request.getHeaderNames();
while (names.hasMoreElements()) {
String name = names.nextElement();
if (!FORWARDED_HEADER_NAMES.contains(name)) {
headers.put(name, Collections.list(request.getHeaders(name)));
}
}
return headers;
}
@Override
public String getScheme() {
return this.scheme;
@@ -214,35 +269,18 @@ public class ForwardedHeaderFilter extends OncePerRequestFilter {
public StringBuffer getRequestURL() {
return new StringBuffer(this.requestUrl);
}
// Override header accessors to not expose forwarded headers
@Override
public String getHeader(String name) {
List<String> value = this.headers.get(name);
return (CollectionUtils.isEmpty(value) ? null : value.get(0));
}
@Override
public Enumeration<String> getHeaders(String name) {
List<String> value = this.headers.get(name);
return (Collections.enumeration(value != null ? value : Collections.emptySet()));
}
@Override
public Enumeration<String> getHeaderNames() {
return Collections.enumeration(this.headers.keySet());
}
}
private static class ForwardedHeaderResponseWrapper extends HttpServletResponseWrapper {
private static class ForwardedHeaderExtractingResponse extends HttpServletResponseWrapper {
private static final String FOLDER_SEPARATOR = "/";
private final HttpServletRequest request;
public ForwardedHeaderResponseWrapper(HttpServletResponse response, HttpServletRequest request) {
public ForwardedHeaderExtractingResponse(HttpServletResponse response, HttpServletRequest request) {
super(response);
this.request = request;
}