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Separate submitted and response salts in UI filters #167
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108 changes: 108 additions & 0 deletions
108
app/src/main/java/org/apache/roller/weblogger/ui/core/filters/SaltValidator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| /* | ||
| * 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. For additional information regarding | ||
| * copyright in this work, please see the NOTICE file in the top level | ||
| * directory of this distribution. | ||
| */ | ||
|
|
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| package org.apache.roller.weblogger.ui.core.filters; | ||
|
|
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| import java.util.Locale; | ||
| import java.util.Objects; | ||
|
|
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| import javax.servlet.ServletException; | ||
| import javax.servlet.http.HttpServletRequest; | ||
|
|
||
| import org.apache.roller.weblogger.ui.core.RollerSession; | ||
| import org.apache.roller.weblogger.ui.rendering.util.cache.SaltCache; | ||
|
|
||
| /** | ||
| * Shared validation for salts submitted by UI forms. | ||
| */ | ||
| public final class SaltValidator { | ||
|
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| private static final String MULTIPART_FORM_DATA = "multipart/form-data"; | ||
|
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| public static final String VALIDATED_REQUEST_ATTRIBUTE = | ||
| SaltValidator.class.getName() + ".validated"; | ||
|
|
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| private SaltValidator() { | ||
| } | ||
|
|
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| /** | ||
| * Validates and consumes the salt submitted as a request parameter. | ||
| * | ||
| * @param request current request | ||
| * @return true when no Roller session is present or the submitted salt is valid | ||
| */ | ||
| public static boolean consumeSubmittedSalt(HttpServletRequest request) { | ||
| RollerSession rollerSession = RollerSession.getRollerSession(request); | ||
| if (rollerSession == null) { | ||
| return true; | ||
| } | ||
|
|
||
| String userId = rollerSession.getAuthenticatedUser() != null | ||
| ? rollerSession.getAuthenticatedUser().getId() : ""; | ||
| String salt = request.getParameter("salt"); | ||
| if (salt == null) { | ||
| return false; | ||
| } | ||
|
|
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| SaltCache saltCache = SaltCache.getInstance(); | ||
| synchronized (saltCache) { | ||
| if (!Objects.equals(saltCache.get(salt), userId)) { | ||
| return false; | ||
| } | ||
| saltCache.remove(salt); | ||
| } | ||
| return true; | ||
| } | ||
|
|
||
| /** | ||
| * Validates and consumes the submitted salt or rejects the request. | ||
| * | ||
| * @param request current request | ||
| * @throws ServletException when the submitted salt is missing or invalid | ||
| */ | ||
| public static void requireSubmittedSalt(HttpServletRequest request) | ||
| throws ServletException { | ||
| if (!consumeSubmittedSalt(request)) { | ||
| throw new ServletException("Security Violation"); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Returns true for a multipart form POST, which Struts parses after the | ||
| * servlet filters have run. | ||
| * | ||
| * @param request current request | ||
| * @return true for multipart/form-data POST requests | ||
| */ | ||
| public static boolean isMultipartFormPost(HttpServletRequest request) { | ||
| if (!"POST".equalsIgnoreCase(request.getMethod())) { | ||
| return false; | ||
| } | ||
|
|
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| String contentType = request.getContentType(); | ||
| if (contentType == null) { | ||
| return false; | ||
| } | ||
|
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| int parameterStart = contentType.indexOf(';'); | ||
| String mediaType = parameterStart >= 0 | ||
| ? contentType.substring(0, parameterStart) : contentType; | ||
| return MULTIPART_FORM_DATA.equals(mediaType.trim().toLowerCase(Locale.ENGLISH)); | ||
| } | ||
| } | ||
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71 changes: 71 additions & 0 deletions
71
app/src/main/java/org/apache/roller/weblogger/ui/struts2/util/ValidateSaltInterceptor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| /* | ||
| * 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. For additional information regarding | ||
| * copyright in this work, please see the NOTICE file in the top level | ||
| * directory of this distribution. | ||
| */ | ||
|
|
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| package org.apache.roller.weblogger.ui.struts2.util; | ||
|
|
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| import javax.servlet.ServletException; | ||
| import javax.servlet.http.HttpServletRequest; | ||
|
|
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| import org.apache.commons.logging.Log; | ||
| import org.apache.commons.logging.LogFactory; | ||
| import org.apache.roller.weblogger.ui.core.filters.SaltValidator; | ||
| import org.apache.struts2.StrutsStatics; | ||
| import org.apache.struts2.dispatcher.multipart.MultiPartRequestWrapper; | ||
|
|
||
| import com.opensymphony.xwork2.ActionContext; | ||
| import com.opensymphony.xwork2.ActionInvocation; | ||
| import com.opensymphony.xwork2.interceptor.AbstractInterceptor; | ||
|
|
||
| /** | ||
| * Validates salts after Struts has wrapped a multipart form request. | ||
| */ | ||
| public class ValidateSaltInterceptor extends AbstractInterceptor implements StrutsStatics { | ||
|
|
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| private static final long serialVersionUID = 2446434402795510394L; | ||
| private static final Log log = LogFactory.getLog(ValidateSaltInterceptor.class); | ||
|
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| @Override | ||
| public String intercept(ActionInvocation invocation) throws Exception { | ||
| ActionContext context = invocation.getInvocationContext(); | ||
| HttpServletRequest request = (HttpServletRequest) context.get(HTTP_REQUEST); | ||
|
|
||
| if (SaltValidator.isMultipartFormPost(request) | ||
| && !Boolean.TRUE.equals(request.getAttribute( | ||
| SaltValidator.VALIDATED_REQUEST_ATTRIBUTE))) { | ||
| if (request instanceof MultiPartRequestWrapper | ||
| && ((MultiPartRequestWrapper) request).hasErrors()) { | ||
| return invocation.invoke(); | ||
| } | ||
|
|
||
| try { | ||
| SaltValidator.requireSubmittedSalt(request); | ||
| } catch (ServletException e) { | ||
| if (log.isDebugEnabled()) { | ||
| log.debug("Valid salt value not found on multipart POST to URL : " | ||
| + request.getServletPath()); | ||
| } | ||
| throw e; | ||
| } | ||
| request.setAttribute( | ||
| SaltValidator.VALIDATED_REQUEST_ATTRIBUTE, Boolean.TRUE); | ||
| } | ||
|
|
||
| return invocation.invoke(); | ||
| } | ||
| } |
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Now that this is the only path,
cache.salt.size(5000) andcache.salt.timeout(3600s) are user-visible limits:LoadSaltFiltermints a salt on every/roller-uirequest and on every tiles FORWARD, so entries get evicted quickly on a multi-user site, and a form left open for over an hour is rejected with the entry text lost. Not a blocker, but please call it out in the description; raising the defaults would soften it.