/
KeyStoreKmsClient.java
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/
KeyStoreKmsClient.java
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/*
* 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.iceberg.encryption.kms;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.util.Enumeration;
import java.util.Map;
import javax.crypto.SecretKey;
import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
import org.apache.iceberg.relocated.com.google.common.collect.Maps;
/**
* KMS client demo class, based on the Java KeyStore API that reads keys from standard PKCS12
* keystore files. Not for use in production.
*/
public class KeyStoreKmsClient extends MemoryMockKMS {
// Path to keystore file. Preferably kept in volatile storage, such as ramdisk. Don't store with
// data.
public static final String KEYSTORE_FILE_PATH_PROP = "keystore.kms.client.file.path";
// Credentials (such as keystore password) must never be kept in a persistent storage.
// In this class, the password is passed as a system environment variable.
public static final String KEYSTORE_PASSWORD_ENV_VAR = "KEYSTORE_PASSWORD";
@Override
public String wrapKey(ByteBuffer key, String wrappingKeyId) {
// keytool keeps key names in lower case
return super.wrapKey(key, wrappingKeyId.toLowerCase());
}
@Override
public ByteBuffer unwrapKey(String wrappedKey, String wrappingKeyId) {
// keytool keeps key names in lower case
return super.unwrapKey(wrappedKey, wrappingKeyId.toLowerCase());
}
@Override
public void initialize(Map<String, String> properties) {
String keystorePath = properties.get(KEYSTORE_FILE_PATH_PROP);
Preconditions.checkNotNull(
keystorePath, KEYSTORE_FILE_PATH_PROP + " must be set in hadoop or table " + "properties");
String keystorePassword = System.getenv(KEYSTORE_PASSWORD_ENV_VAR);
Preconditions.checkNotNull(
keystorePassword, KEYSTORE_PASSWORD_ENV_VAR + " environment variable " + "must be set");
KeyStore keyStore;
try {
keyStore = KeyStore.getInstance("PKCS12");
} catch (KeyStoreException e) {
throw new RuntimeException("Failed to init keystore", e);
}
char[] pwdArray = keystorePassword.toCharArray();
FileInputStream fis;
try {
fis = new FileInputStream(keystorePath);
} catch (FileNotFoundException e) {
throw new RuntimeException("Failed to find keystore file " + keystorePath, e);
}
try {
keyStore.load(fis, pwdArray);
} catch (IOException | NoSuchAlgorithmException | CertificateException e) {
throw new RuntimeException("Failed to load keystore file " + keystorePath, e);
}
Enumeration<String> keyAliases;
try {
keyAliases = keyStore.aliases();
} catch (KeyStoreException e) {
throw new RuntimeException("Failed to get key aliases in keystore file " + keystorePath, e);
}
masterKeys = Maps.newHashMap();
while (keyAliases.hasMoreElements()) {
String keyAlias = keyAliases.nextElement();
SecretKey secretKey;
try {
secretKey = (SecretKey) keyStore.getKey(keyAlias, pwdArray);
} catch (KeyStoreException | NoSuchAlgorithmException | UnrecoverableKeyException e) {
throw new RuntimeException("Failed to get key " + keyAlias, e);
}
masterKeys.put(keyAlias, secretKey.getEncoded());
}
if (masterKeys.isEmpty()) {
throw new RuntimeException("No keys found in " + keystorePath);
}
}
}