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.hive.service.auth;
  
  import java.io.IOException;
  import java.security.Security;
  import java.util.HashMap;
  import javax.security.auth.callback.Callback;
  import javax.security.auth.callback.CallbackHandler;
  import javax.security.auth.callback.NameCallback;
  import javax.security.auth.callback.PasswordCallback;
  import javax.security.auth.callback.UnsupportedCallbackException;
  import javax.security.auth.login.LoginException;
  import javax.security.sasl.AuthenticationException;
  import javax.security.sasl.AuthorizeCallback;
  import javax.security.sasl.SaslException;
  
  import org.apache.hive.service.auth.AuthenticationProviderFactory.AuthMethods;
  import org.apache.hive.service.auth.PlainSaslServer.SaslPlainProvider;
  import org.apache.hive.service.cli.thrift.TCLIService.Iface;
  import org.apache.hive.service.cli.thrift.ThriftCLIService;
  import org.apache.thrift.TProcessor;
  import org.apache.thrift.TProcessorFactory;
  import org.apache.thrift.transport.TSaslClientTransport;
  import org.apache.thrift.transport.TSaslServerTransport;
  import org.apache.thrift.transport.TTransport;
  import org.apache.thrift.transport.TTransportFactory;
  
  public final class PlainSaslHelper {
  
    public static TProcessorFactory getPlainProcessorFactory(ThriftCLIService service) {
      return new SQLPlainProcessorFactory(service);
    }
  
    // Register Plain SASL server provider
    static {
      Security.addProvider(new SaslPlainProvider());
    }
  
    public static TTransportFactory getPlainTransportFactory(String authTypeStr)
      throws LoginException {
      TSaslServerTransport.Factory saslFactory = new TSaslServerTransport.Factory();
      try {
        saslFactory.addServerDefinition("PLAIN", authTypeStr, null, new HashMap<String, String>(),
          new PlainServerCallbackHandler(authTypeStr));
      } catch (AuthenticationException e) {
        throw new LoginException("Error setting callback handler" + e);
      }
      return saslFactory;
    }
  
    public static TTransport getPlainTransport(String username, String password,
      TTransport underlyingTransport) throws SaslException {
      return new TSaslClientTransport("PLAIN", null, null, null, new HashMap<String, String>(),
        new PlainCallbackHandler(username, password), underlyingTransport);
    }
  
    private PlainSaslHelper() {
      throw new UnsupportedOperationException("Can't initialize class");
    }
  
    private static final class PlainServerCallbackHandler implements CallbackHandler {
  
      private final AuthMethods authMethod;
  
      PlainServerCallbackHandler(String authMethodStr) throws AuthenticationException {
        authMethod = AuthMethods.getValidAuthMethod(authMethodStr);
      }
  
      @Override
      public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
        String username = null;
        String password = null;
        AuthorizeCallback ac = null;
  
        for (Callback callback : callbacks) {
          if (callback instanceof NameCallback) {
            NameCallback nc = (NameCallback) callback;
            username = nc.getName();
          } else if (callback instanceof PasswordCallback) {
            PasswordCallback pc = (PasswordCallback) callback;
            password = new String(pc.getPassword());
          } else if (callback instanceof AuthorizeCallback) {
            ac = (AuthorizeCallback) callback;
          } else {
            throw new UnsupportedCallbackException(callback);
          }
        }
        PasswdAuthenticationProvider provider =
          AuthenticationProviderFactory.getAuthenticationProvider(authMethod);
        provider.Authenticate(username, password);
        if (ac != null) {
          ac.setAuthorized(true);
        }
      }
    }
  
    public static class PlainCallbackHandler implements CallbackHandler {
  
      private final String username;
      private final String password;
  
      public PlainCallbackHandler(String username, String password) {
        this.username = username;
        this.password = password;
      }
  
      @Override
      public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
        for (Callback callback : callbacks) {
          if (callback instanceof NameCallback) {
            NameCallback nameCallback = (NameCallback) callback;
            nameCallback.setName(username);
          } else if (callback instanceof PasswordCallback) {
            PasswordCallback passCallback = (PasswordCallback) callback;
            passCallback.setPassword(password.toCharArray());
          } else {
            throw new UnsupportedCallbackException(callback);
          }
        }
      }
    }
  
    private static final class SQLPlainProcessorFactory extends TProcessorFactory {
  
      private final ThriftCLIService service;
  
      SQLPlainProcessorFactory(ThriftCLIService service) {
        super(null);
        this.service = service;
      }
  
      @Override
      public TProcessor getProcessor(TTransport trans) {
        return new TSetIpAddressProcessor<Iface>(service);
      }
    }
  
  }
  