| /** |
| * 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.sentry.service.thrift; |
| |
| import java.util.Arrays; |
| import java.util.List; |
| |
| import javax.security.auth.callback.Callback; |
| import javax.security.auth.callback.UnsupportedCallbackException; |
| import javax.security.sasl.AuthorizeCallback; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.security.SaslRpcServer; |
| import org.apache.sentry.core.common.exception.ConnectionDeniedException; |
| import org.apache.sentry.service.thrift.ServiceConstants.ServerConfig; |
| |
| public class GSSCallback extends SaslRpcServer.SaslGssCallbackHandler { |
| |
| private final Configuration conf; |
| public GSSCallback(Configuration conf) { |
| super(); |
| this.conf = conf; |
| } |
| |
| boolean comparePrincipals(String principal1, String principal2) { |
| String[] principalParts1 = SaslRpcServer.splitKerberosName(principal1); |
| String[] principalParts2 = SaslRpcServer.splitKerberosName(principal2); |
| if (principalParts1.length == 0 || principalParts2.length == 0) { |
| return false; |
| } |
| if (principalParts1.length == principalParts2.length) { |
| for (int i=0; i < principalParts1.length; i++) { |
| if (!principalParts1[i].equals(principalParts2[i])) { |
| return false; |
| } |
| } |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| boolean allowConnect(String principal) { |
| String allowedPrincipals = conf.get(ServerConfig.ALLOW_CONNECT); |
| if (allowedPrincipals == null) { |
| return false; |
| } |
| String principalShortName = getShortName(principal); |
| List<String> items = Arrays.asList(allowedPrincipals.split("\\s*,\\s*")); |
| for (String item : items) { |
| if (comparePrincipals(item, principalShortName)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private String getShortName(String principal) { |
| String parts[] = SaslRpcServer.splitKerberosName(principal); |
| return parts[0]; |
| } |
| |
| @Override |
| public void handle(Callback[] callbacks) |
| throws UnsupportedCallbackException, ConnectionDeniedException { |
| AuthorizeCallback ac = null; |
| for (Callback callback : callbacks) { |
| if (callback instanceof AuthorizeCallback) { |
| ac = (AuthorizeCallback) callback; |
| } else { |
| throw new UnsupportedCallbackException(callback, |
| "Unrecognized SASL GSSAPI Callback"); |
| } |
| } |
| if (ac != null) { |
| String authid = ac.getAuthenticationID(); |
| String authzid = ac.getAuthorizationID(); |
| |
| if (allowConnect(authid)) { |
| if (authid.equals(authzid)) { |
| ac.setAuthorized(true); |
| } else { |
| ac.setAuthorized(false); |
| } |
| if (ac.isAuthorized()) { |
| ac.setAuthorizedID(authzid); |
| } |
| } else { |
| throw new ConnectionDeniedException(ac, |
| "Connection to sentry service denied due to lack of client credentials", |
| authid); |
| } |
| } |
| } |
| } |