Github user Parth-Brahmbhatt commented on a diff in the pull request:
https://github.com/apache/incubator-storm/pull/190#discussion_r15125867
--- Diff:
storm-core/src/jvm/backtype/storm/security/auth/kerberos/AutoHDFS.java ---
@@ -0,0 +1,298 @@
+/**
+ * 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 backtype.storm.security.auth.kerberos;
+
+import backtype.storm.Config;
+import backtype.storm.security.auth.IAutoCredentials;
+import backtype.storm.security.auth.ICredentialsRenewer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.security.auth.Subject;
+import javax.xml.bind.DatatypeConverter;
+import java.io.*;
+import java.lang.reflect.Method;
+import java.net.URI;
+import java.util.Collection;
+import java.util.Map;
+
+/**
+ * Automatically get HDFS delegation tokens and push it to user's
topology. The class
+ * assumes that HDFS configuration files are in your class path.
+ */
+public class AutoHDFS implements IAutoCredentials, ICredentialsRenewer {
+ private static final Logger LOG =
LoggerFactory.getLogger(AutoHDFS.class);
+ public static final String HDFS_CREDENTIALS = "HDFS_CREDENTIALS";
+ private static final String CONF_KEYTAB_KEY = "keytab";
+ private static final String CONF_USER_KEY = "user";
+
+ private Map conf;
+
+ public void prepare(Map conf) {
+ this.conf = conf;
+ }
+
+ @SuppressWarnings("unchecked")
+ private Object getConfiguration() {
+ try {
+ final String hdfsUser = (String) conf.get(Config.HDFS_USER);
+ final String hdfsUserKeyTab = (String)
conf.get(Config.HDFS_USER_KEYTAB);
+
+ /**
+ * Configuration configuration = new Configuration();
+ * configuration.set(CONF_KEYTAB_KEY, hdfsUserKeyTab);
+ * configuration.set(CONF_USER_KEY, hdfsUser);
+ */
+ Class configurationClass =
Class.forName("org.apache.hadoop.conf.Configuration");
+ Object configuration = configurationClass.newInstance();
+
+ Method setMethod = configurationClass.getMethod("set",
String.class, String.class);
+ setMethod.invoke(configuration, CONF_KEYTAB_KEY,
hdfsUserKeyTab);
+ setMethod.invoke(configuration, CONF_USER_KEY, hdfsUser);
+ /**
+ * Following are the minimum set of configuration that needs
to be set, users should have hdfs-site.xml
+ * and core-site.xml in the class path which should set these
configuration.
+ * setMethod.invoke(configuration,
"hadoop.security.authentication", "KERBEROS");
+ *
setMethod.invoke(configuration,"dfs.namenode.kerberos.principal",
+ *
"hdfs/[email protected]");
+ * setMethod.invoke(configuration,
"hadoop.security.kerberos.ticket.cache.path", "/tmp/krb5cc_1002");
+ */
+
+ setMethod.invoke(configuration,
"hadoop.security.authentication", "KERBEROS");
+ setMethod.invoke(configuration,
"dfs.namenode.kerberos.principal","hdfs/[email protected]");
+ setMethod.invoke(configuration,
"hadoop.security.kerberos.ticket.cache.path", "/tmp/krb5cc_1002");
+
+ //UserGroupInformation.setConfiguration(configuration);
+ final Class ugiClass =
Class.forName("org.apache.hadoop.security.UserGroupInformation");
+ Method setConfigurationMethod =
ugiClass.getMethod("setConfiguration", configurationClass);
+ setConfigurationMethod.invoke(null, configuration);
+ return configuration;
+ } catch (Exception e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ @SuppressWarnings("unchecked")
+ private void login(Object configuration) {
+ try {
+ Class configurationClass =
Class.forName("org.apache.hadoop.conf.Configuration");
+ final Class securityUtilClass =
Class.forName("org.apache.hadoop.security.SecurityUtil");
+ Method loginMethod = securityUtilClass.getMethod("login",
configurationClass, String.class, String.class);
+ loginMethod.invoke(null, configuration, CONF_KEYTAB_KEY,
CONF_USER_KEY);
+ } catch (Exception e) {
+ throw new RuntimeException("Failed to login to hdfs .", e);
+ }
+ }
+
+ @SuppressWarnings("unchecked")
+ private byte[] getHDFSCredsWithDelegationToken() throws Exception {
+
+ try {
+ /**
+ * What we want to do is following:
+ * Configuration configuration = new Configuration();
+ * configuration.set(CONF_KEYTAB_KEY, hdfsUserKeyTab);
+ * configuration.set(CONF_USER_KEY, hdfsUser);
+ * UserGroupInformation.setConfiguration(configuration);
+ * if(UserGroupInformation.isSecurityEnabled) {
+ * SecurityUtil.login(configuration, CONF_KEYTAB_KEY,
CONF_USER_KEY);
+ * FileSystem fs = FileSystem.get(nameNodeURI,
configuration, topologySubmitterUser);
+ * UserGroupInformation ugi =
UserGroupInformation.getCurrentUser();
+ * UserGroupInformation proxyUser =
UserGroupInformation.createProxyUser(topologySubmitterUser, ugi);
+ * Credentials credential= proxyUser.getCredentials();
+ * fs.addDelegationToken(hdfsUser, credential);
+ * }
+ * and then return the credential object as a bytearray.
+ */
+ Object configuration = getConfiguration();
+ final Class ugiClass =
Class.forName("org.apache.hadoop.security.UserGroupInformation");
+ final Method isSecurityEnabledMethod =
ugiClass.getDeclaredMethod("isSecurityEnabled");
+ boolean isSecurityEnabled =
(Boolean)isSecurityEnabledMethod.invoke(null);
+ if(isSecurityEnabled) {
+ login(configuration);
+
+ final URI nameNodeURI = URI.create((String)
conf.get(Config.HDFS_NAMENODE_URL));
+ final String topologySubmitterUser = (String)
conf.get(Config.TOPOLOGY_SUBMITTER_USER);
+ final String hdfsUser = (String)
conf.get(Config.HDFS_USER);
+
+ Class configurationClass =
Class.forName("org.apache.hadoop.conf.Configuration");
+
+ //FileSystem fs = FileSystem.get(nameNodeURI,
configuration, topologySubmitterUser);
+ Class fileSystemClass =
Class.forName("org.apache.hadoop.fs.FileSystem");
+ Method getMethod = fileSystemClass.getMethod("get",
URI.class, configurationClass, String.class);
+ Object fileSystem = getMethod.invoke(null, nameNodeURI,
configuration, topologySubmitterUser);
+
+ //UserGroupInformation ugi =
UserGroupInformation.getCurrentUser();
+ Method getCurrentUserMethod =
ugiClass.getMethod("getCurrentUser");
+ final Object ugi = getCurrentUserMethod.invoke(null);
+
+ //UserGroupInformation proxyUser =
UserGroupInformation.createProxyUser(topologySubmitterUser, ugi);
+ Method createProxyUserMethod =
ugiClass.getMethod("createProxyUser", String.class, ugiClass);
+ Object proxyUGI = createProxyUserMethod.invoke(null,
topologySubmitterUser, ugi);
+
+ //Credentials credential= proxyUser.getCredentials();
+ Method getCredentialsMethod =
ugiClass.getMethod("getCredentials");
+ Object credentials = getCredentialsMethod.invoke(proxyUGI);
+
+ //fs.addDelegationToken(hdfsUser, credential);
+ Class credentialClass =
Class.forName("org.apache.hadoop.security.Credentials");
+ Method addDelegationTokensMethod =
fileSystemClass.getMethod("addDelegationTokens", String.class,
+ credentialClass);
+ addDelegationTokensMethod.invoke(fileSystem, hdfsUser,
credentials);
+
+
+ ByteArrayOutputStream bao = new ByteArrayOutputStream();
+ ObjectOutputStream out = new ObjectOutputStream(bao);
+ Method writeMethod = credentialClass.getMethod("write",
DataOutput.class);
+ writeMethod.invoke(credentials, out);
+ out.flush();
+ out.close();
+
+ LOG.info(bao.toString());
+ return bao.toByteArray();
+ } else {
+ throw new RuntimeException("Security is not enabled for
HDFS");
+ }
+ } catch (Exception ex) {
+ throw new RuntimeException("Failed to get delegation tokens."
, ex);
+ }
+ }
+
+ @Override
+ public void populateCredentials(Map<String, String> credentials) {
--- End diff --
completely my bad, I did not intend to keep these config lines uncommented.
I had to keep them uncommented for testing as my hdfs-site.xml settings were
not being picked up by the code due to some class path issue. Removing them.
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