content: /*
   * 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.calcite.avatica.server;
  
  import org.apache.calcite.avatica.remote.ClientKeytabJaasConf;
  
  import java.io.File;
  import java.security.Principal;
  import java.util.HashSet;
  import java.util.Set;
  import javax.security.auth.Subject;
  import javax.security.auth.kerberos.KerberosPrincipal;
  import javax.security.auth.login.Configuration;
  import javax.security.auth.login.LoginContext;
  import javax.security.auth.login.LoginException;
  
  /**
   * Copy of JaasKrbUtil from Kerby that works with IBM Java as well as Oracle Java.
   */
  public class AvaticaJaasKrbUtil {
  
    private AvaticaJaasKrbUtil() {}
  
    public static Subject loginUsingKeytab(
        String principal, File keytabFile) throws LoginException {
      Set<Principal> principals = new HashSet<Principal>();
      principals.add(new KerberosPrincipal(principal));
  
      Subject subject = new Subject(false, principals,
          new HashSet<Object>(), new HashSet<Object>());
  
      Configuration conf = useKeytab(principal, keytabFile);
      String confName = "KeytabConf";
      LoginContext loginContext = new LoginContext(confName, subject, null, conf);
      loginContext.login();
      return loginContext.getSubject();
    }
  
    public static Configuration useKeytab(String principal, File keytabFile) {
      return new ClientKeytabJaasConf(principal, keytabFile.toString());
    }
  }
  
  // End AvaticaJaasKrbUtil.java
  