org.apache.druid.security.kerberos.KerberosHttpClient.java Source code

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Here is the source code for org.apache.druid.security.kerberos.KerberosHttpClient.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 org.apache.druid.security.kerberos;

import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import org.apache.druid.java.util.common.concurrent.Execs;
import org.apache.druid.java.util.common.logger.Logger;
import org.apache.druid.java.util.http.client.AbstractHttpClient;
import org.apache.druid.java.util.http.client.HttpClient;
import org.apache.druid.java.util.http.client.Request;
import org.apache.druid.java.util.http.client.response.HttpResponseHandler;
import org.apache.hadoop.security.UserGroupInformation;
import org.jboss.netty.handler.codec.http.HttpHeaders;
import org.joda.time.Duration;

import java.net.CookieManager;
import java.net.URI;
import java.security.PrivilegedExceptionAction;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Executor;

public class KerberosHttpClient extends AbstractHttpClient {
    private static final Logger log = new Logger(KerberosHttpClient.class);

    private final HttpClient delegate;
    private final CookieManager cookieManager;
    private final Executor exec = Execs.singleThreaded("test-%s");
    private final String internalClientPrincipal;
    private final String internalClientKeytab;

    public KerberosHttpClient(HttpClient delegate, String internalClientPrincipal, String internalClientKeytab) {
        this.delegate = delegate;
        this.cookieManager = new CookieManager();
        this.internalClientPrincipal = internalClientPrincipal;
        this.internalClientKeytab = internalClientKeytab;
    }

    @Override
    public <Intermediate, Final> ListenableFuture<Final> go(Request request,
            HttpResponseHandler<Intermediate, Final> httpResponseHandler, Duration duration) {
        final SettableFuture<Final> retVal = SettableFuture.create();
        inner_go(request, httpResponseHandler, duration, retVal);
        return retVal;
    }

    private <Intermediate, Final> void inner_go(final Request request,
            final HttpResponseHandler<Intermediate, Final> httpResponseHandler, final Duration duration,
            final SettableFuture<Final> future) {
        try {
            final String host = request.getUrl().getHost();
            final URI uri = request.getUrl().toURI();

            Map<String, List<String>> cookieMap = cookieManager.get(uri, Collections.emptyMap());
            for (Map.Entry<String, List<String>> entry : cookieMap.entrySet()) {
                request.addHeaderValues(entry.getKey(), entry.getValue());
            }
            final boolean should_retry_on_unauthorized_response;

            if (DruidKerberosUtil.needToSendCredentials(cookieManager.getCookieStore(), uri)) {
                // No Cookies for requested URI, authenticate user and add authentication header
                log.debug("No Auth Cookie found for URI[%s]. Existing Cookies[%s] Authenticating... ", uri,
                        cookieManager.getCookieStore().getCookies());
                DruidKerberosUtil.authenticateIfRequired(internalClientPrincipal, internalClientKeytab);
                UserGroupInformation currentUser = UserGroupInformation.getCurrentUser();
                String challenge = currentUser.doAs(new PrivilegedExceptionAction<String>() {
                    @Override
                    public String run() throws Exception {
                        return DruidKerberosUtil.kerberosChallenge(host);
                    }
                });
                request.setHeader(HttpHeaders.Names.AUTHORIZATION, "Negotiate " + challenge);
                should_retry_on_unauthorized_response = false;
            } else {
                should_retry_on_unauthorized_response = true;
                log.debug("Found Auth Cookie found for URI[%s].", uri);
            }

            ListenableFuture<RetryResponseHolder<Final>> internalFuture = delegate.go(request,
                    new RetryIfUnauthorizedResponseHandler<Intermediate, Final>(new ResponseCookieHandler(
                            request.getUrl().toURI(), cookieManager, httpResponseHandler)),
                    duration);

            Futures.addCallback(internalFuture, new FutureCallback<RetryResponseHolder<Final>>() {
                @Override
                public void onSuccess(RetryResponseHolder<Final> result) {
                    if (should_retry_on_unauthorized_response && result.shouldRetry()) {
                        log.info("Preparing for Retry");
                        // remove Auth cookie
                        DruidKerberosUtil.removeAuthCookie(cookieManager.getCookieStore(), uri);
                        // clear existing cookie
                        request.setHeader("Cookie", "");
                        inner_go(request.copy(), httpResponseHandler, duration, future);
                    } else {
                        log.debug("Not retrying and returning future response");
                        future.set(result.getObj());
                    }
                }

                @Override
                public void onFailure(Throwable t) {
                    future.setException(t);
                }
            }, exec);
        } catch (Throwable e) {
            throw new RuntimeException(e);
        }
    }

}