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.cassandra.security;
  
  import java.nio.file.Files;
  import java.io.InputStream;
  import java.io.IOException;
  import java.security.Key;
  import java.security.KeyStore;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.config.TransparentDataEncryptionOptions;
  import org.apache.cassandra.io.util.File;
  
  import static org.apache.cassandra.utils.LocalizeString.toLowerCaseLocalized;
  
  /**
   * A {@code KeyProvider} that retrieves keys from a java keystore.
   */
  public class JKSKeyProvider implements KeyProvider
  {
      private static final Logger logger = LoggerFactory.getLogger(JKSKeyProvider.class);
      static final String PROP_KEYSTORE = "keystore";
      static final String PROP_KEYSTORE_PW = "keystore_password";
      static final String PROP_KEYSTORE_TYPE = "store_type";
      static final String PROP_KEY_PW = "key_password";
  
      private final KeyStore store;
      private final boolean isJceks;
      private final TransparentDataEncryptionOptions options;
  
      public JKSKeyProvider(TransparentDataEncryptionOptions options)
      {
          this.options = options;
          logger.info("initializing keystore from file {}", options.get(PROP_KEYSTORE));
          try (InputStream inputStream = Files.newInputStream(File.getPath(options.get(PROP_KEYSTORE))))
          {
              store = KeyStore.getInstance(options.get(PROP_KEYSTORE_TYPE));
              store.load(inputStream, options.get(PROP_KEYSTORE_PW).toCharArray());
              isJceks = store.getType().equalsIgnoreCase("jceks");
          }
          catch (Exception e)
          {
              throw new RuntimeException("couldn't load keystore", e);
          }
      }
  
      public Key getSecretKey(String keyAlias) throws IOException
      {
          // there's a lovely behavior with jceks files that all aliases are lower-cased
          if (isJceks)
              keyAlias = toLowerCaseLocalized(keyAlias);
  
          Key key;
          try
          {
              String password = options.get(PROP_KEY_PW);
              if (password == null || password.isEmpty())
                  password = options.get(PROP_KEYSTORE_PW);
              key = store.getKey(keyAlias, password.toCharArray());
          }
          catch (Exception e)
          {
              throw new IOException("unable to load key from keystore");
          }
          if (key == null)
              throw new IOException(String.format("key %s was not found in keystore", keyAlias));
          return key;
      }
  }
  