joshelser.TUGIAssumingProcessor.java Source code

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Here is the source code for joshelser.TUGIAssumingProcessor.java

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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 joshelser;

import java.io.IOException;
import java.security.PrivilegedExceptionAction;

import javax.security.sasl.SaslServer;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.thrift.TException;
import org.apache.thrift.TProcessor;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TSaslServerTransport;
import org.apache.thrift.transport.TTransport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Processor that pulls the SaslServer object out of the transport, and assumes the remote user's UGI before calling through to the original processor.
 *
 * This is used on the server side to set the UGI for each specific call.
 *
 * Lifted from Apache Hive 0.14
 */
public class TUGIAssumingProcessor implements TProcessor {
    private static final Logger log = LoggerFactory.getLogger(TUGIAssumingProcessor.class);
    final TProcessor wrapped;

    public TUGIAssumingProcessor(TProcessor wrapped) {
        this.wrapped = wrapped;
    }

    @Override
    public boolean process(final TProtocol inProt, final TProtocol outProt) throws TException {
        TTransport trans = inProt.getTransport();
        if (!(trans instanceof TSaslServerTransport)) {
            throw new TException("Unexpected non-SASL transport " + trans.getClass());
        }
        TSaslServerTransport saslTrans = (TSaslServerTransport) trans;
        SaslServer saslServer = saslTrans.getSaslServer();
        String authId = saslServer.getAuthorizationID();
        String endUser = authId;

        UserGroupInformation clientUgi = null;
        try {
            clientUgi = UserGroupInformation.createProxyUser(endUser, UserGroupInformation.getLoginUser());
            final String remoteUser = clientUgi.getShortUserName();
            log.debug("Executing action as {}", remoteUser);
            return clientUgi.doAs(new PrivilegedExceptionAction<Boolean>() {
                @Override
                public Boolean run() {
                    try {
                        return wrapped.process(inProt, outProt);
                    } catch (TException te) {
                        throw new RuntimeException(te);
                    }
                }
            });
        } catch (RuntimeException rte) {
            if (rte.getCause() instanceof TException) {
                log.error("Failed to invoke wrapped processor", rte.getCause());
                throw (TException) rte.getCause();
            }
            throw rte;
        } catch (InterruptedException | IOException e) {
            log.error("Failed to invoke wrapped processor", e);
            throw new RuntimeException(e);
        } finally {
            if (clientUgi != null) {
                try {
                    FileSystem.closeAllForUGI(clientUgi);
                } catch (IOException exception) {
                    log.error("Could not clean up file-system handles for UGI: {}", clientUgi, exception);
                }
            }
        }
    }
}