Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/13218#discussion_r67489509
--- Diff:
core/src/main/scala/org/apache/spark/deploy/rest/RestCsrfPreventionFilter.scala
---
@@ -0,0 +1,56 @@
+/*
+ * 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.
+ */
+
+package org.apache.spark.deploy.rest
+
+import javax.servlet._
+import javax.servlet.http.{HttpServletRequest, HttpServletResponse}
+
+/**
+ * This filter provides protection against cross site request forgery
(CSRF)
+ * attacks for REST APIs. Enabling this filter on an endpoint results in
the
+ * requirement of all client to send a particular HTTP header
(X-XSRF-HEADER)
+ * with every request. In the absense of this header the filter will
reject the
+ * attempt as a bad request.
+ */
+private[spark] class RestCsrfPreventionFilter extends Filter {
+
+ import RestCsrfPreventionFilter._
+
+ def init(filterConfig: FilterConfig): Unit = {}
+
+ def doFilter(
+ servletRequest: ServletRequest,
+ servletResponse: ServletResponse,
+ filterChain: FilterChain): Unit = {
+ val httpReq = servletRequest.asInstanceOf[HttpServletRequest]
--- End diff --
to be strict here, there ought to be check for the request being an
`HttpServletRequest`. That said, there is no other subclass of `ServletRequest`
which is ever seen in the wild.
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