File eclipse-CVE-2020-27225.patch of Package eclipse.32874
From 213812355860e3732e1b28e620df31db8ff160aa Mon Sep 17 00:00:00 2001
From: Andrew Johnson
Date: Mon, 15 Mar 2021 20:53:01 +0530
Subject: 569855: Fix for Eclipse live help. - Use tokens - Backport to
R4_15_maintenance branch
Index: eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.base/src/org/eclipse/help/internal/base/BaseHelpSystem.java
===================================================================
--- eclipse-4.15.orig/eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.base/src/org/eclipse/help/internal/base/BaseHelpSystem.java
+++ eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.base/src/org/eclipse/help/internal/base/BaseHelpSystem.java
@@ -59,6 +59,7 @@ public final class BaseHelpSystem {
private IBrowser browser;
private IBrowser internalBrowser;
private HelpDisplay helpDisplay = null;
+ private String liveHelpToken = null;
private BaseHelpSystem() {
super();
@@ -350,4 +351,29 @@ public final class BaseHelpSystem {
}
}
+ /**
+ * Check supplied token against stored token. Clears the stored token if
+ * successful.
+ *
+ * @param helpSessionToken
+ * @return true if match successful
+ */
+ public boolean matchOnceLiveHelpToken(String helpSessionToken) {
+ /*
+ * @FIXME - should we use a constant time comparison, and store/compare a
+ * cryptographic hash?
+ */
+ if (liveHelpToken != null && liveHelpToken.equals(helpSessionToken)) {
+ // Enforce one-time use.
+ liveHelpToken = null;
+ return true;
+ } else {
+ return false;
+ }
+ }
+
+ public void setLiveHelpToken(String helpSessionToken) {
+ liveHelpToken = helpSessionToken;
+ }
+
}
Index: eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.base/src/org/eclipse/help/internal/base/HelpDisplay.java
===================================================================
--- eclipse-4.15.orig/eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.base/src/org/eclipse/help/internal/base/HelpDisplay.java
+++ eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.base/src/org/eclipse/help/internal/base/HelpDisplay.java
@@ -15,6 +15,8 @@ package org.eclipse.help.internal.base;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
+import java.util.UUID;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
@@ -196,6 +198,12 @@ public class HelpDisplay {
String topic = helpURL.substring("topic=".length()); //$NON-NLS-1$
helpURL = getHelpDisplay().getHelpForTopic( topic, WebappManager.getHost(), WebappManager.getPort());
}
+ String basehelp = getBaseURL();
+ if (BaseHelpSystem.getMode() != BaseHelpSystem.MODE_INFOCENTER && helpURL.startsWith(basehelp)) {
+ String sessid = UUID.randomUUID().toString();
+ BaseHelpSystem.getInstance().setLiveHelpToken(sessid);
+ helpURL += (helpURL.indexOf('?') < 0 ? '?' : '&') + "token=" + sessid; //$NON-NLS-1$
+ }
BaseHelpSystem.getHelpBrowser(forceExternal)
.displayURL(helpURL);
Index: eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.webapp/advanced/livehelp_js.jsp
===================================================================
--- eclipse-4.15.orig/eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.webapp/advanced/livehelp_js.jsp
+++ eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.webapp/advanced/livehelp_js.jsp
@@ -47,7 +47,15 @@ function liveActionInternal(topHelpWindo
url=url.substring(0, i+1);
var encodedArg=encodeURIComponent(argument);
url=url+"livehelp/?pluginID="+pluginId+"&class="+className+"&arg="+encodedArg+"&nocaching="+Math.random();
-
+ <%
+ Object token = request.getSession().getAttribute("LSESSION"); //$NON-NLS-1$
+ // Validate token to protect against XSS
+ if (token instanceof String && ((String)token).matches("[a-z0-9-]{36}")) {//$NON-NLS-1$) {
+ %>
+ url=url+"&token=<%=token%>";
+ <%
+ }
+ %>
// we need to find the toolbar frame.
// to do: cleanup this, including the location of the hidden livehelp frame.
var toolbarFrame = topHelpWindow.HelpFrame.ContentFrame.ContentToolbarFrame;
Index: eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.webapp/index.jsp
===================================================================
--- eclipse-4.15.orig/eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.webapp/index.jsp
+++ eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.webapp/index.jsp
@@ -12,9 +12,11 @@
IBM Corporation - initial API and implementation
--%>
<%@ page import="org.eclipse.help.internal.webapp.data.*" errorPage="/advanced/err.jsp" contentType="text/html; charset=UTF-8"%>
+<%@ page import="java.util.UUID" %>
+<%@ page import="org.eclipse.help.internal.base.BaseHelpSystem" %>
<%
request.setCharacterEncoding("UTF-8");
- ServerState.webappStarted(application,request, response);
+ ServerState.webappStarted(application,request, response);
// Read the scope parameter
RequestScope.setScopeFromRequest(request, response);
LayoutData data = new LayoutData(application,request, response);
@@ -33,7 +35,22 @@
</body>
</html>
<%
- }else {
+ } else {
+ // For live help
+ String token = request.getParameter("token"); //$NON-NLS-1$
+ if (token != null && token.matches("[a-z0-9-]{36}")) { //$NON-NLS-1$
+ if (BaseHelpSystem.getInstance().matchOnceLiveHelpToken(token)) {
+ // Only one session can grab this
+ if (request.getSession().getAttribute("XSESSION") == null) { //$NON-NLS-1$
+ String token2 = UUID.randomUUID().toString();
+ request.getSession().setAttribute("XSESSION", token2); //$NON-NLS-1$
+ int port = request.getLocalPort();
+ response.addHeader("Set-Cookie", "XSESSION-" + port + "=" + token2 + "; HttpOnly; SameSite=Strict"); //$NON-NLS-1 //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
+ String token3 = UUID.randomUUID().toString();
+ request.getSession().setAttribute("LSESSION", token3); //$NON-NLS-1$
+ }
+ }
+ }
request.getRequestDispatcher("/advanced/index.jsp" + data.getQuery()).forward(request, response);
}
%>
Index: eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.webapp/src/org/eclipse/help/internal/webapp/data/LayoutData.java
===================================================================
--- eclipse-4.15.orig/eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.webapp/src/org/eclipse/help/internal/webapp/data/LayoutData.java
+++ eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.webapp/src/org/eclipse/help/internal/webapp/data/LayoutData.java
@@ -46,6 +46,11 @@ public class LayoutData extends RequestD
// initialize the query string
String qs = request.getQueryString();
+ // Remove any live help token
+ if (qs != null) {
+ qs = qs.replaceFirst("^token=[a-z0-9-]{36}", ""); //$NON-NLS-1$ //$NON-NLS-2$
+ qs = qs.replaceFirst("&token=[a-z0-9-]{36}", ""); //$NON-NLS-1$ //$NON-NLS-2$
+ }
if (qs != null && qs.length() > 0)
query = "?" + qs; //$NON-NLS-1$
}
Index: eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.webapp/src/org/eclipse/help/internal/webapp/servlet/LiveHelpServlet.java
===================================================================
--- eclipse-4.15.orig/eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.webapp/src/org/eclipse/help/internal/webapp/servlet/LiveHelpServlet.java
+++ eclipse-platform-sources-I20200305-0155/eclipse.platform.ua/org.eclipse.help.webapp/src/org/eclipse/help/internal/webapp/servlet/LiveHelpServlet.java
@@ -14,8 +14,8 @@
package org.eclipse.help.internal.webapp.servlet;
import java.io.IOException;
-
import javax.servlet.ServletException;
+import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@@ -51,6 +51,45 @@ public class LiveHelpServlet extends Htt
return;
}
req.setCharacterEncoding("UTF-8"); //$NON-NLS-1$
+ String sessionid = req.getSession().getId();
+ Cookie cookies[] = req.getCookies();
+ boolean jsessOK = false;
+ boolean xsessOK = false;
+ boolean lsessOK = false;
+ // Unique session ID per help server
+ int port = req.getLocalPort();
+ String xsessname = "XSESSION-" + port; //$NON-NLS-1$
+ if (cookies != null) {
+ for (Cookie cookie : cookies) {
+ if (cookie.getName().equals("JSESSIONID")) {//$NON-NLS-1$
+ if (sessionid.length() >= 30 &&
+ cookie.getValue().startsWith(sessionid)) {
+ jsessOK = true;
+ }
+ }
+ if (cookie.getName().equals(xsessname)) {
+ if (cookie.getValue().equals(req.getSession().getAttribute("XSESSION"))) { //$NON-NLS-1$
+ xsessOK = true;
+ }
+ }
+ }
+ }
+ String token = req.getParameter("token"); //$NON-NLS-1$
+ if (token != null && token.equals(req.getSession().getAttribute("LSESSION"))) { //$NON-NLS-1$
+ lsessOK = true;
+ }
+ if (!jsessOK) {
+ resp.sendError(HttpServletResponse.SC_FORBIDDEN, "JSESSIONID"); //$NON-NLS-1$
+ return;
+ }
+ if (!lsessOK) {
+ resp.sendError(HttpServletResponse.SC_FORBIDDEN, "token"); //$NON-NLS-1$
+ return;
+ }
+ if (!xsessOK) {
+ resp.sendError(HttpServletResponse.SC_FORBIDDEN, xsessname);
+ return;
+ }
String pluginID = req.getParameter("pluginID"); //$NON-NLS-1$
if (pluginID == null)
return;
@@ -59,6 +98,11 @@ public class LiveHelpServlet extends Htt
return;
String arg = req.getParameter("arg"); //$NON-NLS-1$
BaseHelpSystem.runLiveHelp(pluginID, className, arg);
+ /*
+ * @FIXME Should runLiveHelp return an error if the plugin/class is wrong
+ * so a SC_BAD_REQUEST can be returned? Or does this reveal too much?
+ */
+ resp.setStatus(HttpServletResponse.SC_ACCEPTED);
}
/**
*
