Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/incubator-spark/pull/332#discussion_r9875875
--- Diff: core/src/main/scala/org/apache/spark/SecurityManager.scala ---
@@ -0,0 +1,112 @@
+/*
+ * 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
+
+import org.apache.hadoop.io.Text
+import org.apache.hadoop.security.Credentials
+import org.apache.hadoop.security.UserGroupInformation
+
+import org.apache.spark.deploy.SparkHadoopUtil
+
+/**
+ * Spark class responsible for security.
+ */
+private[spark] class SecurityManager extends Logging {
+
+ private val isAuthOn = System.getProperty("spark.authenticate",
"false").toBoolean
+ private val isUIAuthOn = System.getProperty("spark.authenticate.ui",
"false").toBoolean
+ private val viewAcls = System.getProperty("spark.ui.view.acls",
"").split(',').map(_.trim()).toSet
+ private val secretKey = generateSecretKey()
+ logDebug("is auth enabled = " + isAuthOn + " is uiAuth enabled = " +
isUIAuthOn)
+
+ /**
+ * In Yarn mode it uses Hadoop UGI to pass the secret as that
+ * will keep it protected. For a standalone SPARK cluster
+ * use a environment variable SPARK_SECRET to specify the secret.
+ * This probably isn't ideal but only the user who starts the process
+ * should have access to view the variable (at least on Linux).
+ * Since we can't set the environment variable we set the
+ * java system property SPARK_SECRET so it will automatically
+ * generate a secret is not specified. This definitely is not
+ * ideal since users can see it. We should switch to put it in
+ * a config.
+ */
+ private def generateSecretKey(): String = {
+
+ if (!isAuthenticationEnabled) return null
+ // first check to see if secret already set, else generate it
+ if (SparkHadoopUtil.get.isYarnMode) {
+ val credentials = SparkHadoopUtil.get.getCurrentUserCredentials()
+ if (credentials != null) {
+ val secretKey = credentials.getSecretKey(new Text("akkaCookie"))
+ if (secretKey != null) {
+ logDebug("in yarn mode, getting secret from credentials")
+ return new Text(secretKey).toString
+ } else {
+ logDebug("getSecretKey: yarn mode, secret key from credentials
is null")
+ }
+ } else {
+ logDebug("getSecretKey: yarn mode, credentials are null")
+ }
+ }
+ val secret = System.getProperty("SPARK_SECRET",
System.getenv("SPARK_SECRET"))
+ if (secret != null && !secret.isEmpty()) return secret
+ // generate one
+ val sCookie = akka.util.Crypt.generateSecureCookie
+
+ // if we generate we must be the first so lets set it so its used by
everyone else
+ if (SparkHadoopUtil.get.isYarnMode) {
+ val creds = new Credentials()
+ creds.addSecretKey(new Text("akkaCookie"), sCookie.getBytes())
--- End diff --
yep, I'll update.
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