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.bookkeeper.sasl;
  
  import java.io.IOException;
  import java.util.regex.Pattern;
  import javax.security.auth.Subject;
  import javax.security.auth.login.LoginException;
  import javax.security.sasl.SaslException;
  import org.apache.bookkeeper.auth.AuthCallbacks;
  import org.apache.bookkeeper.auth.AuthToken;
  import org.apache.bookkeeper.auth.BookieAuthProvider;
  import org.apache.bookkeeper.client.BKException;
  import org.apache.bookkeeper.conf.ServerConfiguration;
  import org.apache.bookkeeper.proto.BookieConnectionPeer;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * SASL Bookie Authentication Provider.
   */
  public class SASLBookieAuthProvider implements BookieAuthProvider {
  
      private static final Logger LOG = LoggerFactory.getLogger(SASLBookieAuthProvider.class);
  
      private SaslServerState server;
      private final AuthCallbacks.GenericCallback<Void> completeCb;
  
      SASLBookieAuthProvider(BookieConnectionPeer addr, AuthCallbacks.GenericCallback<Void> completeCb,
          ServerConfiguration serverConfiguration, Subject subject, Pattern allowedIdsPattern) {
          this.completeCb = completeCb;
          try {
              server = new SaslServerState(serverConfiguration, subject, allowedIdsPattern);
          } catch (IOException | LoginException error) {
              LOG.error("Error while booting SASL server", error);
              completeCb.operationComplete(BKException.Code.UnauthorizedAccessException, null);
          }
      }
  
      @Override
      public void process(AuthToken m, AuthCallbacks.GenericCallback<AuthToken> cb) {
          try {
              byte[] clientSideToken = m.getData();
              byte[] response = server.response(clientSideToken);
              if (response != null) {
                  cb.operationComplete(BKException.Code.OK, AuthToken.wrap(response));
              }
              if (server.isComplete()) {
                  completeCb.operationComplete(BKException.Code.OK, null);
              }
          } catch (SaslException err) {
              if (LOG.isDebugEnabled()) {
                  LOG.debug("SASL error", err);
              }
              completeCb.operationComplete(BKException.Code.UnauthorizedAccessException, null);
          }
  
      }
  
  }
  