/*
* 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 com.google.protobuf.RpcCallback;
import com.google.protobuf.RpcController;
import com.google.protobuf.Service;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hbase.Coprocessor;
import org.apache.hadoop.hbase.CoprocessorEnvironment;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.DoNotRetryIOException;
import org.apache.hadoop.hbase.coprocessor.CoprocessorService;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
import org.apache.hadoop.hbase.ipc.RequestContext;
import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.protobuf.ResponseConverter;
import org.apache.hadoop.hbase.protobuf.generated.ClientProtos;
import org.apache.hadoop.hbase.protobuf.generated.SecureBulkLoadProtos.SecureBulkLoadService;
import org.apache.hadoop.hbase.protobuf.generated.SecureBulkLoadProtos.PrepareBulkLoadRequest;
import org.apache.hadoop.hbase.protobuf.generated.SecureBulkLoadProtos.PrepareBulkLoadResponse;
import org.apache.hadoop.hbase.protobuf.generated.SecureBulkLoadProtos.CleanupBulkLoadRequest;
import org.apache.hadoop.hbase.protobuf.generated.SecureBulkLoadProtos.CleanupBulkLoadResponse;
import org.apache.hadoop.hbase.protobuf.generated.SecureBulkLoadProtos.SecureBulkLoadHFilesRequest;
import org.apache.hadoop.hbase.protobuf.generated.SecureBulkLoadProtos.SecureBulkLoadHFilesResponse;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.security.SecureBulkLoadUtil;
import org.apache.hadoop.hbase.security.User;
import org.apache.hadoop.hbase.security.UserProvider;
import org.apache.hadoop.hbase.security.token.FsDelegationToken;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.FSHDFSUtils;
import org.apache.hadoop.hbase.util.Methods;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.token.Token;
import java.io.IOException;
import java.math.BigInteger;
import java.security.PrivilegedAction;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.List;
/**
* Coprocessor service for bulk loads in secure mode.
* This coprocessor has to be installed as part of enabling
* security in HBase.
*
* This service addresses two issues:
*
* 1. Moving files in a secure filesystem wherein the HBase Client
* and HBase Server are different filesystem users.
* 2. Does moving in a secure manner. Assuming that the filesystem
* is POSIX compliant.
*
* The algorithm is as follows:
*
* 1. Create an hbase owned staging directory which is
* world traversable (711): /hbase/staging
* 2. A user writes out data to his secure output directory: /user/foo/data
* 3. A call is made to hbase to create a secret staging directory
* which globally rwx (777): /user/staging/averylongandrandomdirectoryname
* 4. The user moves the data into the random staging directory,
* then calls bulkLoadHFiles()
*
* Like delegation tokens the strength of the security lies in the length
* and randomness of the secret directory.
*
*/
@InterfaceAudience.Private
public class SecureBulkLoadEndpoint extends SecureBulkLoadService
implements CoprocessorService, Coprocessor {
public static final long VERSION = 0L;
//320/5 = 64 characters
private static final int RANDOM_WIDTH = 320;
private static final int RANDOM_RADIX = 32;
private static Log LOG = LogFactory.getLog(SecureBulkLoadEndpoint.class);
private final static FsPermission PERM_ALL_ACCESS = FsPermission.valueOf("-rwxrwxrwx");
private final static FsPermission PERM_HIDDEN = FsPermission.valueOf("-rwx--x--x");
private SecureRandom random;
private FileSystem fs;
private Configuration conf;
//two levels so it doesn't get deleted accidentally
//no sticky bit in Hadoop 1.0
private Path baseStagingDir;
private RegionCoprocessorEnvironment env;
private UserProvider userProvider;
@Override
public void start(CoprocessorEnvironment env) {
this.env = (RegionCoprocessorEnvironment)env;
random = new SecureRandom();
conf = env.getConfiguration();
baseStagingDir = SecureBulkLoadUtil.getBaseStagingDir(conf);
this.userProvider = UserProvider.instantiate(conf);
try {
fs = FileSystem.get(conf);
fs.mkdirs(baseStagingDir, PERM_HIDDEN);
fs.setPermission(baseStagingDir, PERM_HIDDEN);
//no sticky bit in hadoop-1.0, making directory nonempty so it never gets erased
fs.mkdirs(new Path(baseStagingDir,"DONOTERASE"), PERM_HIDDEN);
FileStatus status = fs.getFileStatus(baseStagingDir);
if(status == null) {
throw new IllegalStateException("Failed to create staging directory");
}
if(!status.getPermission().equals(PERM_HIDDEN)) {
throw new IllegalStateException(
"Directory already exists but permissions aren't set to '-rwx--x--x' ");
}
} catch (IOException e) {
throw new IllegalStateException("Failed to get FileSystem instance",e);
}
}
@Override
public void stop(CoprocessorEnvironment env) throws IOException {
}
@Override
public void prepareBulkLoad(RpcController controller,
PrepareBulkLoadRequest request,
RpcCallback<PrepareBulkLoadResponse> done){
try {
getAccessController().prePrepareBulkLoad(env);
String bulkToken = createStagingDir(baseStagingDir,
getActiveUser(), ProtobufUtil.toTableName(request.getTableName())).toString();
done.run(PrepareBulkLoadResponse.newBuilder().setBulkToken(bulkToken).build());
} catch (IOException e) {
ResponseConverter.setControllerException(controller, e);
}
done.run(null);
}
@Override
public void cleanupBulkLoad(RpcController controller,
CleanupBulkLoadRequest request,
RpcCallback<CleanupBulkLoadResponse> done) {
try {
getAccessController().preCleanupBulkLoad(env);
fs.delete(createStagingDir(baseStagingDir,
getActiveUser(),
env.getRegion().getTableDesc().getTableName(),
new Path(request.getBulkToken()).getName()),
true);
done.run(CleanupBulkLoadResponse.newBuilder().build());
} catch (IOException e) {
ResponseConverter.setControllerException(controller, e);
}
done.run(null);
}
@Override
public void secureBulkLoadHFiles(RpcController controller,
SecureBulkLoadHFilesRequest request,
RpcCallback<SecureBulkLoadHFilesResponse> done) {
final List<Pair<byte[], String>> familyPaths = new ArrayList<Pair<byte[], String>>();
for(ClientProtos.BulkLoadHFileRequest.FamilyPath el : request.getFamilyPathList()) {
familyPaths.add(new Pair(el.getFamily().toByteArray(),el.getPath()));
}
final Token userToken =
new Token(request.getFsToken().getIdentifier().toByteArray(),
request.getFsToken().getPassword().toByteArray(),
new Text(request.getFsToken().getKind()),
new Text(request.getFsToken().getService()));
final String bulkToken = request.getBulkToken();
User user = getActiveUser();
final UserGroupInformation ugi = user.getUGI();
if(userToken != null) {
ugi.addToken(userToken);
} else if (userProvider.isHadoopSecurityEnabled()) {
//we allow this to pass through in "simple" security mode
//for mini cluster testing
ResponseConverter.setControllerException(controller,
new DoNotRetryIOException("User token cannot be null"));
return;
}
HRegion region = env.getRegion();
boolean bypass = false;
if (region.getCoprocessorHost() != null) {
try {
bypass = region.getCoprocessorHost().preBulkLoadHFile(familyPaths);
} catch (IOException e) {
ResponseConverter.setControllerException(controller, e);
done.run(null);
return;
}
}
boolean loaded = false;
if (!bypass) {
// Get the target fs (HBase region server fs) delegation token
// Since we have checked the permission via 'preBulkLoadHFile', now let's give
// the 'request user' necessary token to operate on the target fs.
// After this point the 'doAs' user will hold two tokens, one for the source fs
// ('request user'), another for the target fs (HBase region server principal).
FsDelegationToken targetfsDelegationToken = new FsDelegationToken(userProvider, "renewer");
try {
targetfsDelegationToken.acquireDelegationToken(fs);
} catch (IOException e) {
ResponseConverter.setControllerException(controller, e);
done.run(null);
return;
}
ugi.addToken(targetfsDelegationToken.getUserToken());
loaded = ugi.doAs(new PrivilegedAction<Boolean>() {
@Override
public Boolean run() {
FileSystem fs = null;
try {
Configuration conf = env.getConfiguration();
fs = FileSystem.get(conf);
for(Pair<byte[], String> el: familyPaths) {
Path stageFamily = new Path(bulkToken, Bytes.toString(el.getFirst()));
if(!fs.exists(stageFamily)) {
fs.mkdirs(stageFamily);
fs.setPermission(stageFamily, PERM_ALL_ACCESS);
}
}
//We call bulkLoadHFiles as requesting user
//To enable access prior to staging
return env.getRegion().bulkLoadHFiles(familyPaths, true,
new SecureBulkLoadListener(fs, bulkToken, conf));
} catch (Exception e) {
LOG.error("Failed to complete bulk load", e);
}
return false;
}
});
}
if (region.getCoprocessorHost() != null) {
try {
loaded = region.getCoprocessorHost().postBulkLoadHFile(familyPaths, loaded);
} catch (IOException e) {
ResponseConverter.setControllerException(controller, e);
done.run(null);
return;
}
}
done.run(SecureBulkLoadHFilesResponse.newBuilder().setLoaded(loaded).build());
}
private AccessController getAccessController() {
return (AccessController) this.env.getRegion()
.getCoprocessorHost().findCoprocessor(AccessController.class.getName());
}
private Path createStagingDir(Path baseDir,
User user,
TableName tableName) throws IOException {
String randomDir = user.getShortName()+"__"+ tableName +"__"+
(new BigInteger(RANDOM_WIDTH, random).toString(RANDOM_RADIX));
return createStagingDir(baseDir, user, tableName, randomDir);
}
private Path createStagingDir(Path baseDir,
User user,
TableName tableName,
String randomDir) throws IOException {
Path p = new Path(baseDir, randomDir);
fs.mkdirs(p, PERM_ALL_ACCESS);
fs.setPermission(p, PERM_ALL_ACCESS);
return p;
}
private User getActiveUser() {
User user = RequestContext.getRequestUser();
if (!RequestContext.isInRequestContext()) {
return null;
}
//this is for testing
if("simple".equalsIgnoreCase(conf.get(User.HBASE_SECURITY_CONF_KEY))) {
return User.createUserForTesting(conf, user.getShortName(), new String[]{});
}
return user;
}
@Override
public Service getService() {
return this;
}
private static class SecureBulkLoadListener implements HRegion.BulkLoadListener {
// Target filesystem
private FileSystem fs;
private String stagingDir;
private Configuration conf;
// Source filesystem
private FileSystem srcFs = null;
public SecureBulkLoadListener(FileSystem fs, String stagingDir, Configuration conf) {
this.fs = fs;
this.stagingDir = stagingDir;
this.conf = conf;
}
@Override
public String prepareBulkLoad(final byte[] family, final String srcPath) throws IOException {
Path p = new Path(srcPath);
Path stageP = new Path(stagingDir, new Path(Bytes.toString(family), p.getName()));
if (srcFs == null) {
srcFs = FileSystem.get(p.toUri(), conf);
}
if(!isFile(p)) {
throw new IOException("Path does not reference a file: " + p);
}
// Check to see if the source and target filesystems are the same
if (!FSHDFSUtils.isSameHdfs(conf, srcFs, fs)) {
LOG.debug("Bulk-load file " + srcPath + " is on different filesystem than " +
"the destination filesystem. Copying file over to destination staging dir.");
FileUtil.copy(srcFs, p, fs, stageP, false, conf);
}
else {
LOG.debug("Moving " + p + " to " + stageP);
if(!fs.rename(p, stageP)) {
throw new IOException("Failed to move HFile: " + p + " to " + stageP);
}
}
return stageP.toString();
}
@Override
public void doneBulkLoad(byte[] family, String srcPath) throws IOException {
LOG.debug("Bulk Load done for: " + srcPath);
}
@Override
public void failedBulkLoad(final byte[] family, final String srcPath) throws IOException {
Path p = new Path(srcPath);
Path stageP = new Path(stagingDir,
new Path(Bytes.toString(family), p.getName()));
LOG.debug("Moving " + stageP + " back to " + p);
if(!fs.rename(stageP, p))
throw new IOException("Failed to move HFile: " + stageP + " to " + p);
}
/**
* Check if the path is referencing a file.
* This is mainly needed to avoid symlinks.
* @param p
* @return true if the p is a file
* @throws IOException
*/
private boolean isFile(Path p) throws IOException {
FileStatus status = srcFs.getFileStatus(p);
boolean isFile = !status.isDir();
try {
isFile = isFile && !(Boolean)Methods.call(FileStatus.class, status, "isSymlink", null, null);
} catch (Exception e) {
}
return isFile;
}
}
}