io.druid.security.kerberos.KerberosEscalator.java Source code

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Here is the source code for io.druid.security.kerberos.KerberosEscalator.java

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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.security.kerberos;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;
import com.google.common.base.Throwables;
import com.metamx.http.client.HttpClient;
import io.druid.java.util.common.logger.Logger;
import io.druid.server.security.AuthenticationResult;
import io.druid.server.security.Escalator;
import org.apache.hadoop.security.UserGroupInformation;
import org.eclipse.jetty.client.api.Authentication;
import org.eclipse.jetty.client.api.ContentResponse;
import org.eclipse.jetty.client.api.Request;
import org.eclipse.jetty.util.Attributes;
import org.jboss.netty.handler.codec.http.HttpHeaders;

import java.net.URI;
import java.security.PrivilegedExceptionAction;

@JsonTypeName("kerberos")
public class KerberosEscalator implements Escalator {
    private static final Logger log = new Logger(KerberosAuthenticator.class);

    private final String internalClientPrincipal;
    private final String internalClientKeytab;
    private final String authorizerName;

    @JsonCreator
    public KerberosEscalator(@JsonProperty("authorizerName") String authorizerName,
            @JsonProperty("internalClientPrincipal") String internalClientPrincipal,
            @JsonProperty("internalClientKeytab") String internalClientKeytab) {
        this.authorizerName = authorizerName;
        this.internalClientPrincipal = internalClientPrincipal;
        this.internalClientKeytab = internalClientKeytab;

    }

    @Override
    public HttpClient createEscalatedClient(HttpClient baseClient) {
        return new KerberosHttpClient(baseClient, internalClientPrincipal, internalClientKeytab);
    }

    @Override
    public org.eclipse.jetty.client.HttpClient createEscalatedJettyClient(
            org.eclipse.jetty.client.HttpClient baseClient) {
        baseClient.getAuthenticationStore().addAuthentication(new Authentication() {
            @Override
            public boolean matches(String type, URI uri, String realm) {
                return true;
            }

            @Override
            public Result authenticate(final Request request, ContentResponse response,
                    Authentication.HeaderInfo headerInfo, Attributes context) {
                return new Result() {
                    @Override
                    public URI getURI() {
                        return request.getURI();
                    }

                    @Override
                    public void apply(Request request) {
                        try {
                            // No need to set cookies as they are handled by Jetty Http Client itself.
                            URI uri = request.getURI();
                            if (DruidKerberosUtil.needToSendCredentials(baseClient.getCookieStore(), uri)) {
                                log.debug(
                                        "No Auth Cookie found for URI[%s]. Existing Cookies[%s] Authenticating... ",
                                        uri, baseClient.getCookieStore().getCookies());
                                final String host = request.getHost();
                                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.getHeaders().add(HttpHeaders.Names.AUTHORIZATION, "Negotiate " + challenge);
                            } else {
                                log.debug("Found Auth Cookie found for URI[%s].", uri);
                            }
                        } catch (Throwable e) {
                            Throwables.propagate(e);
                        }
                    }
                };
            }
        });
        return baseClient;
    }

    @Override
    public AuthenticationResult createEscalatedAuthenticationResult() {
        return new AuthenticationResult(internalClientPrincipal, authorizerName, null);
    }
}