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/*
* 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.access;
import java.io.Closeable;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentSkipListMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.AuthUtil;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.exceptions.DeserializationException;
import org.apache.hadoop.hbase.security.Superusers;
import org.apache.hadoop.hbase.security.User;
import org.apache.hadoop.hbase.security.UserProvider;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
import org.apache.zookeeper.KeeperException;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Lists;
/**
* Performs authorization checks for a given user's assigned permissions
*/
@InterfaceAudience.Private
public class TableAuthManager implements Closeable {
private static class PermissionCache {
/** Cache of user permissions */
private ListMultimap userCache = ArrayListMultimap.create();
/** Cache of group permissions */
private ListMultimap groupCache = ArrayListMultimap.create();
public List getUser(String user) {
return userCache.get(user);
}
public void putUser(String user, T perm) {
userCache.put(user, perm);
}
public List replaceUser(String user, Iterable perms) {
return userCache.replaceValues(user, perms);
}
public List getGroup(String group) {
return groupCache.get(group);
}
public void putGroup(String group, T perm) {
groupCache.put(group, perm);
}
public List replaceGroup(String group, Iterable perms) {
return groupCache.replaceValues(group, perms);
}
/**
* Returns a combined map of user and group permissions, with group names prefixed by
* {@link AuthUtil#GROUP_PREFIX}.
*/
public ListMultimap getAllPermissions() {
ListMultimap tmp = ArrayListMultimap.create();
tmp.putAll(userCache);
for (String group : groupCache.keySet()) {
tmp.putAll(AuthUtil.toGroupEntry(group), groupCache.get(group));
}
return tmp;
}
}
private static Log LOG = LogFactory.getLog(TableAuthManager.class);
/** Cache of global permissions */
private volatile PermissionCache globalCache;
private ConcurrentSkipListMap> tableCache =
new ConcurrentSkipListMap>();
private ConcurrentSkipListMap> nsCache =
new ConcurrentSkipListMap>();
private Configuration conf;
private ZKPermissionWatcher zkperms;
private volatile long mtime;
private TableAuthManager(ZooKeeperWatcher watcher, Configuration conf)
throws IOException {
this.conf = conf;
// initialize global permissions based on configuration
globalCache = initGlobal(conf);
this.zkperms = new ZKPermissionWatcher(watcher, this, conf);
try {
this.zkperms.start();
} catch (KeeperException ke) {
LOG.error("ZooKeeper initialization failed", ke);
}
}
@Override
public void close() {
this.zkperms.close();
}
/**
* Returns a new {@code PermissionCache} initialized with permission assignments
* from the {@code hbase.superuser} configuration key.
*/
private PermissionCache initGlobal(Configuration conf) throws IOException {
UserProvider userProvider = UserProvider.instantiate(conf);
User user = userProvider.getCurrent();
if (user == null) {
throw new IOException("Unable to obtain the current user, " +
"authorization checks for internal operations will not work correctly!");
}
PermissionCache newCache = new PermissionCache();
String currentUser = user.getShortName();
// the system user is always included
List superusers = Lists.asList(currentUser, conf.getStrings(
Superusers.SUPERUSER_CONF_KEY, new String[0]));
if (superusers != null) {
for (String name : superusers) {
if (AuthUtil.isGroupPrincipal(name)) {
newCache.putGroup(AuthUtil.getGroupName(name),
new Permission(Permission.Action.values()));
} else {
newCache.putUser(name, new Permission(Permission.Action.values()));
}
}
}
return newCache;
}
public ZKPermissionWatcher getZKPermissionWatcher() {
return this.zkperms;
}
public void refreshTableCacheFromWritable(TableName table,
byte[] data) throws IOException {
if (data != null && data.length > 0) {
ListMultimap perms;
try {
perms = AccessControlLists.readPermissions(data, conf);
} catch (DeserializationException e) {
throw new IOException(e);
}
if (perms != null) {
if (Bytes.equals(table.getName(), AccessControlLists.ACL_GLOBAL_NAME)) {
updateGlobalCache(perms);
} else {
updateTableCache(table, perms);
}
}
} else {
LOG.debug("Skipping permission cache refresh because writable data is empty");
}
}
public void refreshNamespaceCacheFromWritable(String namespace, byte[] data) throws IOException {
if (data != null && data.length > 0) {
ListMultimap perms;
try {
perms = AccessControlLists.readPermissions(data, conf);
} catch (DeserializationException e) {
throw new IOException(e);
}
if (perms != null) {
updateNsCache(namespace, perms);
}
} else {
LOG.debug("Skipping permission cache refresh because writable data is empty");
}
}
/**
* Updates the internal global permissions cache
*
* @param userPerms
*/
private void updateGlobalCache(ListMultimap userPerms) {
PermissionCache newCache = null;
try {
newCache = initGlobal(conf);
for (Map.Entry entry : userPerms.entries()) {
if (AuthUtil.isGroupPrincipal(entry.getKey())) {
newCache.putGroup(AuthUtil.getGroupName(entry.getKey()),
new Permission(entry.getValue().getActions()));
} else {
newCache.putUser(entry.getKey(), new Permission(entry.getValue().getActions()));
}
}
globalCache = newCache;
mtime++;
} catch (IOException e) {
// Never happens
LOG.error("Error occured while updating the global cache", e);
}
}
/**
* Updates the internal permissions cache for a single table, splitting
* the permissions listed into separate caches for users and groups to optimize
* group lookups.
*
* @param table
* @param tablePerms
*/
private void updateTableCache(TableName table,
ListMultimap tablePerms) {
PermissionCache newTablePerms = new PermissionCache();
for (Map.Entry entry : tablePerms.entries()) {
if (AuthUtil.isGroupPrincipal(entry.getKey())) {
newTablePerms.putGroup(AuthUtil.getGroupName(entry.getKey()), entry.getValue());
} else {
newTablePerms.putUser(entry.getKey(), entry.getValue());
}
}
tableCache.put(table, newTablePerms);
mtime++;
}
/**
* Updates the internal permissions cache for a single table, splitting
* the permissions listed into separate caches for users and groups to optimize
* group lookups.
*
* @param namespace
* @param tablePerms
*/
private void updateNsCache(String namespace,
ListMultimap tablePerms) {
PermissionCache newTablePerms = new PermissionCache();
for (Map.Entry entry : tablePerms.entries()) {
if (AuthUtil.isGroupPrincipal(entry.getKey())) {
newTablePerms.putGroup(AuthUtil.getGroupName(entry.getKey()), entry.getValue());
} else {
newTablePerms.putUser(entry.getKey(), entry.getValue());
}
}
nsCache.put(namespace, newTablePerms);
mtime++;
}
private PermissionCache getTablePermissions(TableName table) {
if (!tableCache.containsKey(table)) {
tableCache.putIfAbsent(table, new PermissionCache());
}
return tableCache.get(table);
}
private PermissionCache getNamespacePermissions(String namespace) {
if (!nsCache.containsKey(namespace)) {
nsCache.putIfAbsent(namespace, new PermissionCache());
}
return nsCache.get(namespace);
}
/**
* Authorizes a global permission
* @param perms
* @param action
* @return true if authorized, false otherwise
*/
private boolean authorize(List perms, Permission.Action action) {
if (perms != null) {
for (Permission p : perms) {
if (p.implies(action)) {
return true;
}
}
} else if (LOG.isDebugEnabled()) {
LOG.debug("No permissions found for " + action);
}
return false;
}
/**
* Authorize a global permission based on ACLs for the given user and the
* user's groups.
* @param user
* @param action
* @return true if known and authorized, false otherwise
*/
public boolean authorize(User user, Permission.Action action) {
if (user == null) {
return false;
}
if (authorize(globalCache.getUser(user.getShortName()), action)) {
return true;
}
String[] groups = user.getGroupNames();
if (groups != null) {
for (String group : groups) {
if (authorize(globalCache.getGroup(group), action)) {
return true;
}
}
}
return false;
}
private boolean authorize(List perms,
TableName table, byte[] family,
Permission.Action action) {
return authorize(perms, table, family, null, action);
}
private boolean authorize(List perms,
TableName table, byte[] family,
byte[] qualifier, Permission.Action action) {
if (perms != null) {
for (TablePermission p : perms) {
if (p.implies(table, family, qualifier, action)) {
return true;
}
}
} else if (LOG.isDebugEnabled()) {
LOG.debug("No permissions found for table="+table);
}
return false;
}
private boolean hasAccess(List perms,
TableName table, Permission.Action action) {
if (perms != null) {
for (TablePermission p : perms) {
if (p.implies(action)) {
return true;
}
}
} else if (LOG.isDebugEnabled()) {
LOG.debug("No permissions found for table="+table);
}
return false;
}
/**
* Authorize a user for a given KV. This is called from AccessControlFilter.
*/
public boolean authorize(User user, TableName table, Cell cell, Permission.Action action) {
try {
List perms = AccessControlLists.getCellPermissionsForUser(user, cell);
if (LOG.isTraceEnabled()) {
LOG.trace("Perms for user " + user.getShortName() + " in cell " + cell + ": " +
(perms != null ? perms : ""));
}
if (perms != null) {
for (Permission p: perms) {
if (p.implies(action)) {
return true;
}
}
}
} catch (IOException e) {
// We failed to parse the KV tag
LOG.error("Failed parse of ACL tag in cell " + cell);
// Fall through to check with the table and CF perms we were able
// to collect regardless
}
return false;
}
public boolean authorize(User user, String namespace, Permission.Action action) {
// Global authorizations supercede namespace level
if (authorize(user, action)) {
return true;
}
// Check namespace permissions
PermissionCache tablePerms = nsCache.get(namespace);
if (tablePerms != null) {
List userPerms = tablePerms.getUser(user.getShortName());
if (authorize(userPerms, namespace, action)) {
return true;
}
String[] groupNames = user.getGroupNames();
if (groupNames != null) {
for (String group : groupNames) {
List groupPerms = tablePerms.getGroup(group);
if (authorize(groupPerms, namespace, action)) {
return true;
}
}
}
}
return false;
}
private boolean authorize(List perms, String namespace,
Permission.Action action) {
if (perms != null) {
for (TablePermission p : perms) {
if (p.implies(namespace, action)) {
return true;
}
}
} else if (LOG.isDebugEnabled()) {
LOG.debug("No permissions for authorize() check, table=" + namespace);
}
return false;
}
/**
* Checks authorization to a given table and column family for a user, based on the
* stored user permissions.
*
* @param user
* @param table
* @param family
* @param action
* @return true if known and authorized, false otherwise
*/
public boolean authorizeUser(User user, TableName table, byte[] family,
Permission.Action action) {
return authorizeUser(user, table, family, null, action);
}
public boolean authorizeUser(User user, TableName table, byte[] family,
byte[] qualifier, Permission.Action action) {
if (table == null) table = AccessControlLists.ACL_TABLE_NAME;
// Global and namespace authorizations supercede table level
if (authorize(user, table.getNamespaceAsString(), action)) {
return true;
}
// Check table permissions
return authorize(getTablePermissions(table).getUser(user.getShortName()), table, family,
qualifier, action);
}
/**
* Checks if the user has access to the full table or at least a family/qualifier
* for the specified action.
*
* @param user
* @param table
* @param action
* @return true if the user has access to the table, false otherwise
*/
public boolean userHasAccess(User user, TableName table, Permission.Action action) {
if (table == null) table = AccessControlLists.ACL_TABLE_NAME;
// Global and namespace authorizations supercede table level
if (authorize(user, table.getNamespaceAsString(), action)) {
return true;
}
// Check table permissions
return hasAccess(getTablePermissions(table).getUser(user.getShortName()), table, action);
}
/**
* Checks global authorization for a given action for a group, based on the stored
* permissions.
*/
public boolean authorizeGroup(String groupName, Permission.Action action) {
List perms = globalCache.getGroup(groupName);
if (LOG.isDebugEnabled()) {
LOG.debug("authorizing " + (perms != null && !perms.isEmpty() ? perms.get(0) : "") +
" for " + action);
}
return authorize(perms, action);
}
/**
* Checks authorization to a given table, column family and column for a group, based
* on the stored permissions.
* @param groupName
* @param table
* @param family
* @param qualifier
* @param action
* @return true if known and authorized, false otherwise
*/
public boolean authorizeGroup(String groupName, TableName table, byte[] family,
byte[] qualifier, Permission.Action action) {
// Global authorization supercedes table level
if (authorizeGroup(groupName, action)) {
return true;
}
if (table == null) table = AccessControlLists.ACL_TABLE_NAME;
// Namespace authorization supercedes table level
String namespace = table.getNamespaceAsString();
if (authorize(getNamespacePermissions(namespace).getGroup(groupName), namespace, action)) {
return true;
}
// Check table level
List tblPerms = getTablePermissions(table).getGroup(groupName);
if (LOG.isDebugEnabled()) {
LOG.debug("authorizing " + (tblPerms != null && !tblPerms.isEmpty() ? tblPerms.get(0) : "") +
" for " +groupName + " on " + table + "." + Bytes.toString(family) + "." +
Bytes.toString(qualifier) + " with " + action);
}
return authorize(tblPerms, table, family, qualifier, action);
}
/**
* Checks if the user has access to the full table or at least a family/qualifier
* for the specified action.
* @param groupName
* @param table
* @param action
* @return true if the group has access to the table, false otherwise
*/
public boolean groupHasAccess(String groupName, TableName table, Permission.Action action) {
// Global authorization supercedes table level
if (authorizeGroup(groupName, action)) {
return true;
}
if (table == null) table = AccessControlLists.ACL_TABLE_NAME;
// Namespace authorization supercedes table level
if (hasAccess(getNamespacePermissions(table.getNamespaceAsString()).getGroup(groupName),
table, action)) {
return true;
}
// Check table level
return hasAccess(getTablePermissions(table).getGroup(groupName), table, action);
}
public boolean authorize(User user, TableName table, byte[] family,
byte[] qualifier, Permission.Action action) {
if (authorizeUser(user, table, family, qualifier, action)) {
return true;
}
String[] groups = user.getGroupNames();
if (groups != null) {
for (String group : groups) {
if (authorizeGroup(group, table, family, qualifier, action)) {
return true;
}
}
}
return false;
}
public boolean hasAccess(User user, TableName table, Permission.Action action) {
if (userHasAccess(user, table, action)) {
return true;
}
String[] groups = user.getGroupNames();
if (groups != null) {
for (String group : groups) {
if (groupHasAccess(group, table, action)) {
return true;
}
}
}
return false;
}
public boolean authorize(User user, TableName table, byte[] family,
Permission.Action action) {
return authorize(user, table, family, null, action);
}
/**
* Returns true if the given user has a {@link TablePermission} matching up
* to the column family portion of a permission. Note that this permission
* may be scoped to a given column qualifier and does not guarantee that
* authorize() on the same column family would return true.
*/
public boolean matchPermission(User user,
TableName table, byte[] family, Permission.Action action) {
PermissionCache tablePerms = tableCache.get(table);
if (tablePerms != null) {
List userPerms = tablePerms.getUser(user.getShortName());
if (userPerms != null) {
for (TablePermission p : userPerms) {
if (p.matchesFamily(table, family, action)) {
return true;
}
}
}
String[] groups = user.getGroupNames();
if (groups != null) {
for (String group : groups) {
List groupPerms = tablePerms.getGroup(group);
if (groupPerms != null) {
for (TablePermission p : groupPerms) {
if (p.matchesFamily(table, family, action)) {
return true;
}
}
}
}
}
}
return false;
}
public boolean matchPermission(User user,
TableName table, byte[] family, byte[] qualifier,
Permission.Action action) {
PermissionCache tablePerms = tableCache.get(table);
if (tablePerms != null) {
List userPerms = tablePerms.getUser(user.getShortName());
if (userPerms != null) {
for (TablePermission p : userPerms) {
if (p.matchesFamilyQualifier(table, family, qualifier, action)) {
return true;
}
}
}
String[] groups = user.getGroupNames();
if (groups != null) {
for (String group : groups) {
List groupPerms = tablePerms.getGroup(group);
if (groupPerms != null) {
for (TablePermission p : groupPerms) {
if (p.matchesFamilyQualifier(table, family, qualifier, action)) {
return true;
}
}
}
}
}
}
return false;
}
public void removeNamespace(byte[] ns) {
nsCache.remove(Bytes.toString(ns));
}
public void removeTable(TableName table) {
tableCache.remove(table);
}
/**
* Overwrites the existing permission set for a given user for a table, and
* triggers an update for zookeeper synchronization.
* @param username
* @param table
* @param perms
*/
public void setTableUserPermissions(String username, TableName table,
List perms) {
PermissionCache tablePerms = getTablePermissions(table);
tablePerms.replaceUser(username, perms);
writeTableToZooKeeper(table, tablePerms);
}
/**
* Overwrites the existing permission set for a group and triggers an update
* for zookeeper synchronization.
* @param group
* @param table
* @param perms
*/
public void setTableGroupPermissions(String group, TableName table,
List perms) {
PermissionCache tablePerms = getTablePermissions(table);
tablePerms.replaceGroup(group, perms);
writeTableToZooKeeper(table, tablePerms);
}
/**
* Overwrites the existing permission set for a given user for a table, and
* triggers an update for zookeeper synchronization.
* @param username
* @param namespace
* @param perms
*/
public void setNamespaceUserPermissions(String username, String namespace,
List perms) {
PermissionCache tablePerms = getNamespacePermissions(namespace);
tablePerms.replaceUser(username, perms);
writeNamespaceToZooKeeper(namespace, tablePerms);
}
/**
* Overwrites the existing permission set for a group and triggers an update
* for zookeeper synchronization.
* @param group
* @param namespace
* @param perms
*/
public void setNamespaceGroupPermissions(String group, String namespace,
List perms) {
PermissionCache tablePerms = getNamespacePermissions(namespace);
tablePerms.replaceGroup(group, perms);
writeNamespaceToZooKeeper(namespace, tablePerms);
}
public void writeTableToZooKeeper(TableName table,
PermissionCache tablePerms) {
byte[] serialized = new byte[0];
if (tablePerms != null) {
serialized = AccessControlLists.writePermissionsAsBytes(tablePerms.getAllPermissions(), conf);
}
zkperms.writeToZookeeper(table.getName(), serialized);
}
public void writeNamespaceToZooKeeper(String namespace,
PermissionCache tablePerms) {
byte[] serialized = new byte[0];
if (tablePerms != null) {
serialized = AccessControlLists.writePermissionsAsBytes(tablePerms.getAllPermissions(), conf);
}
zkperms.writeToZookeeper(Bytes.toBytes(AccessControlLists.toNamespaceEntry(namespace)),
serialized);
}
public long getMTime() {
return mtime;
}
private static Map managerMap =
new HashMap();
private static Map refCount = new HashMap();
/** Returns a TableAuthManager from the cache. If not cached, constructs a new one. Returned
* instance should be released back by calling {@link #release(TableAuthManager)}. */
public synchronized static TableAuthManager getOrCreate(
ZooKeeperWatcher watcher, Configuration conf) throws IOException {
TableAuthManager instance = managerMap.get(watcher);
if (instance == null) {
instance = new TableAuthManager(watcher, conf);
managerMap.put(watcher, instance);
}
int ref = refCount.get(instance) == null ? 0 : refCount.get(instance).intValue();
refCount.put(instance, ref + 1);
return instance;
}
@VisibleForTesting
static int getTotalRefCount() {
int total = 0;
for (int count : refCount.values()) {
total += count;
}
return total;
}
/**
* Releases the resources for the given TableAuthManager if the reference count is down to 0.
* @param instance TableAuthManager to be released
*/
public synchronized static void release(TableAuthManager instance) {
if (refCount.get(instance) == null || refCount.get(instance) < 1) {
String msg = "Something wrong with the TableAuthManager reference counting: " + instance
+ " whose count is " + refCount.get(instance);
LOG.fatal(msg);
instance.close();
managerMap.remove(instance.getZKPermissionWatcher().getWatcher());
instance.getZKPermissionWatcher().getWatcher().abort(msg, null);
} else {
int ref = refCount.get(instance);
refCount.put(instance, ref-1);
if (ref-1 == 0) {
instance.close();
managerMap.remove(instance.getZKPermissionWatcher().getWatcher());
refCount.remove(instance);
}
}
}
}