Merge pull request #2912 from Mithrilwoodrat/master

Add check for disabled HTTPOnly setting in Tomcat

java/ql/src/experimental/Security/CWE/CWE-1004/InsecureTomcatConfig.qhelp

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+<!DOCTYPE qhelp SYSTEM "qhelp.dtd">
+<qhelp>
+
+<overview>
+<p>When you add an application to a Tomcat server, it will generate a new <code>JSESSIONID</code> when you call <code>request.getSession()</code>
+or if you invoke a JSP from a servlet. If cookies are generated without the <code>HttpOnly</code> flag,
+an attacker can use a cross-site scripting (XSS) attack to get another user's session ID.
+</p>
+</overview>
+
+<recommendation>
+<p>Tomcat version 7+ automatically sets an <code>HttpOnly</code> flag on all session cookies to
+prevent client side scripts from accessing the session ID. 
+In most situations, you should not override this behavior.</p>
+</recommendation>
+
+<example>
+<p>The following example shows a Tomcat configuration with <code>useHttpOnly</code> disabled. Usually you should not set this.</p>
+
+<sample src="insecure-web.xml" />
+</example>
+
+<references>
+<li>
+CWE:
+<a href="https://cwe.mitre.org/data/definitions/1004.html">Sensitive Cookie Without 'HttpOnly' Flag</a>.
+</li>
+<li>
+OWASP:
+<a href="https://www.owasp.org/index.php/HttpOnly">
+  HttpOnly
+</a>.
+</li>
+</references>
+</qhelp>

java/ql/src/experimental/Security/CWE/CWE-1004/InsecureTomcatConfig.ql

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+/**
+ * @name Tomcat config disables 'HttpOnly' flag (XSS risk)
+ * @description Disabling 'HttpOnly' leaves session cookies vulnerable to an XSS attack.
+ * @kind problem
+ * @problem.severity warning
+ * @precision medium
+ * @id java/tomcat-disabled-httponly
+ * @tags security
+ *       external/cwe/cwe-1004
+ */
+
+import java
+import semmle.code.xml.WebXML
+
+private class HttpOnlyConfig extends WebContextParameter {
+  HttpOnlyConfig() { this.getParamName().getValue() = "useHttpOnly" }
+
+  string getParamValueElementValue() { result = getParamValue().getValue() }
+
+  predicate isHTTPOnlySet() { getParamValueElementValue().toLowerCase() = "false" }
+}
+
+from HttpOnlyConfig config
+where config.isHTTPOnlySet()
+select config,
+  "httpOnly should be enabled in tomcat config file to help mitigate cross-site scripting (XSS) attacks"

java/ql/src/experimental/Security/CWE/CWE-1004/insecure-web.xml

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+<web-app xmlns="http://java.sun.com/xml/ns/javaee" 
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
+          http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
+    <display-name>Sample Tomcat Web Application</display-name>
+    <context-param>
+        <param-name>useHttpOnly</param-name>
+        <param-value>false</param-value>
+    </context-param>
+</web-app>