| /* |
| * 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.nifi.security.kms; |
| |
| import org.apache.commons.codec.DecoderException; |
| import org.apache.nifi.security.kms.configuration.FileBasedKeyProviderConfiguration; |
| import org.apache.nifi.security.kms.configuration.KeyProviderConfiguration; |
| import org.apache.nifi.security.kms.configuration.KeyStoreKeyProviderConfiguration; |
| import org.apache.nifi.security.kms.configuration.StaticKeyProviderConfiguration; |
| import org.apache.commons.codec.binary.Hex; |
| import org.apache.nifi.security.kms.reader.KeyReaderException; |
| |
| import javax.crypto.SecretKey; |
| import javax.crypto.spec.SecretKeySpec; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.security.KeyStore; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Key Provider Factory |
| */ |
| public class KeyProviderFactory { |
| private static final String SECRET_KEY_ALGORITHM = "AES"; |
| |
| /** |
| * Get Key Provider based on Configuration |
| * |
| * @param configuration Key Provider Configuration |
| * @return Key Provider |
| */ |
| public static KeyProvider getKeyProvider(final KeyProviderConfiguration<?> configuration) { |
| KeyProvider keyProvider; |
| |
| if (configuration instanceof StaticKeyProviderConfiguration) { |
| final StaticKeyProviderConfiguration providerConfiguration = (StaticKeyProviderConfiguration) configuration; |
| final Map<String, SecretKey> secretKeys; |
| try { |
| secretKeys = getSecretKeys(providerConfiguration.getKeys()); |
| keyProvider = new StaticKeyProvider(secretKeys); |
| } catch (final DecoderException e) { |
| throw new KeyReaderException("Decoding Hexadecimal Secret Keys failed", e); |
| } |
| } else if (configuration instanceof FileBasedKeyProviderConfiguration) { |
| final FileBasedKeyProviderConfiguration providerConfiguration = (FileBasedKeyProviderConfiguration) configuration; |
| final Path keyProviderPath = Paths.get(providerConfiguration.getLocation()); |
| keyProvider = new FileBasedKeyProvider(keyProviderPath, providerConfiguration.getRootKey()); |
| } else if (configuration instanceof KeyStoreKeyProviderConfiguration) { |
| final KeyStoreKeyProviderConfiguration providerConfiguration = (KeyStoreKeyProviderConfiguration) configuration; |
| final KeyStore keyStore = providerConfiguration.getKeyStore(); |
| keyProvider = new KeyStoreKeyProvider(keyStore, providerConfiguration.getKeyPassword()); |
| } else { |
| throw new UnsupportedOperationException(String.format("Key Provider [%s] not supported", configuration.getKeyProviderClass().getName())); |
| } |
| |
| return keyProvider; |
| } |
| |
| private static Map<String, SecretKey> getSecretKeys(final Map<String, String> keys) throws DecoderException { |
| final Map<String, SecretKey> secretKeys = new HashMap<>(); |
| |
| for (final Map.Entry<String, String> keyEntry : keys.entrySet()) { |
| final byte[] encodedSecretKey = Hex.decodeHex(keyEntry.getValue()); |
| final SecretKey secretKey = new SecretKeySpec(encodedSecretKey, SECRET_KEY_ALGORITHM); |
| secretKeys.put(keyEntry.getKey(), secretKey); |
| } |
| |
| return secretKeys; |
| } |
| } |