/**
* 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.hadoop.hbase.security;
import java.io.IOException;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonConfigurationKeys;
import org.apache.hadoop.hbase.BaseConfigurable;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.security.Groups;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.ReflectionUtils;
/**
* Provide an instance of a user. Allows custom {@link User} creation.
*/
@InterfaceAudience.Private
public class UserProvider extends BaseConfigurable {
private static final String USER_PROVIDER_CONF_KEY = "hbase.client.userprovider.class";
private static final ListeningExecutorService executor = MoreExecutors.listeningDecorator(
Executors.newScheduledThreadPool(
1,
new ThreadFactoryBuilder().setDaemon(true).setNameFormat("group-cache-%d").build()));
private LoadingCache<String, String[]> groupCache = null;
static Groups groups = Groups.getUserToGroupsMappingService();
@Override
public void setConf(final Configuration conf) {
super.setConf(conf);
synchronized (UserProvider.class) {
if (!(groups instanceof User.TestingGroups)) {
groups = Groups.getUserToGroupsMappingService(conf);
}
}
long cacheTimeout =
getConf().getLong(CommonConfigurationKeys.HADOOP_SECURITY_GROUPS_CACHE_SECS,
CommonConfigurationKeys.HADOOP_SECURITY_GROUPS_CACHE_SECS_DEFAULT) * 1000;
this.groupCache = CacheBuilder.newBuilder()
// This is the same timeout that hadoop uses. So we'll follow suit.
.refreshAfterWrite(cacheTimeout, TimeUnit.MILLISECONDS)
.expireAfterWrite(10 * cacheTimeout, TimeUnit.MILLISECONDS)
// Set concurrency level equal to the default number of handlers that
// the simple handler spins up.
.concurrencyLevel(20)
// create the loader
// This just delegates to UGI.
.build(new CacheLoader<String, String[]>() {
// Since UGI's don't hash based on the user id
// The cache needs to be keyed on the same thing that Hadoop's Groups class
// uses. So this cache uses shortname.
@Override
public String[] load(String ugi) throws Exception {
return getGroupStrings(ugi);
}
private String[] getGroupStrings(String ugi) {
try {
Set<String> result = new LinkedHashSet<>(groups.getGroups(ugi));
return result.toArray(new String[result.size()]);
} catch (Exception e) {
return new String[0];
}
}
// Provide the reload function that uses the executor thread.
public ListenableFuture<String[]> reload(final String k,
String[] oldValue) throws Exception {
return executor.submit(new Callable<String[]>() {
@Override
public String[] call() throws Exception {
return getGroupStrings(k);
}
});
}
});
}
/**
* Instantiate the {@link UserProvider} specified in the configuration and set the passed
* configuration via {@link UserProvider#setConf(Configuration)}
* @param conf to read and set on the created {@link UserProvider}
* @return a {@link UserProvider} ready for use.
*/
public static UserProvider instantiate(Configuration conf) {
Class<? extends UserProvider> clazz =
conf.getClass(USER_PROVIDER_CONF_KEY, UserProvider.class, UserProvider.class);
return ReflectionUtils.newInstance(clazz, conf);
}
/**
* Set the {@link UserProvider} in the given configuration that should be instantiated
* @param conf to update
* @param provider class of the provider to set
*/
public static void setUserProviderForTesting(Configuration conf,
Class<? extends UserProvider> provider) {
conf.set(USER_PROVIDER_CONF_KEY, provider.getName());
}
/**
* @return the userName for the current logged-in user.
* @throws IOException if the underlying user cannot be obtained
*/
public String getCurrentUserName() throws IOException {
User user = getCurrent();
return user == null ? null : user.getName();
}
/**
* @return <tt>true</tt> if security is enabled, <tt>false</tt> otherwise
*/
public boolean isHBaseSecurityEnabled() {
return User.isHBaseSecurityEnabled(this.getConf());
}
/**
* @return whether or not Kerberos authentication is configured for Hadoop. For non-secure Hadoop,
* this always returns <code>false</code>. For secure Hadoop, it will return the value
* from {@code UserGroupInformation.isSecurityEnabled()}.
*/
public boolean isHadoopSecurityEnabled() {
return User.isSecurityEnabled();
}
/**
* @return the current user within the current execution context
* @throws IOException if the user cannot be loaded
*/
public User getCurrent() throws IOException {
return User.getCurrent();
}
/**
* Wraps an underlying {@code UserGroupInformation} instance.
* @param ugi The base Hadoop user
* @return User
*/
public User create(UserGroupInformation ugi) {
if (ugi == null) {
return null;
}
return new User.SecureHadoopUser(ugi, groupCache);
}
/**
* Log in the current process using the given configuration keys for the credential file and login
* principal.
* <p>
* <strong>This is only applicable when running on secure Hadoop</strong> -- see
* org.apache.hadoop.security.SecurityUtil#login(Configuration,String,String,String). On regular
* Hadoop (without security features), this will safely be ignored.
* </p>
* @param fileConfKey Property key used to configure path to the credential file
* @param principalConfKey Property key used to configure login principal
* @param localhost Current hostname to use in any credentials
* @throws IOException underlying exception from SecurityUtil.login() call
*/
public void login(String fileConfKey, String principalConfKey, String localhost)
throws IOException {
User.login(getConf(), fileConfKey, principalConfKey, localhost);
}
}