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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.kafka.common.security.scram.internals;

import java.util.Base64;
import java.util.Collection;
import java.util.Properties;

import org.apache.kafka.common.security.authenticator.CredentialCache;
import org.apache.kafka.common.security.scram.ScramCredential;

/**
 * SCRAM Credential persistence utility functions. Implements format conversion used
 * for the credential store implemented in Kafka. Credentials are persisted as a comma-separated
 * String of key-value pairs:
 * 
 *   salt=salt,stored_key=stored_key,server_key=server_key,iterations=iterations
 * 
* */ public final class ScramCredentialUtils { private static final String SALT = "salt"; private static final String STORED_KEY = "stored_key"; private static final String SERVER_KEY = "server_key"; private static final String ITERATIONS = "iterations"; private ScramCredentialUtils() {} public static String credentialToString(ScramCredential credential) { return String.format("%s=%s,%s=%s,%s=%s,%s=%d", SALT, Base64.getEncoder().encodeToString(credential.salt()), STORED_KEY, Base64.getEncoder().encodeToString(credential.storedKey()), SERVER_KEY, Base64.getEncoder().encodeToString(credential.serverKey()), ITERATIONS, credential.iterations()); } public static ScramCredential credentialFromString(String str) { Properties props = toProps(str); if (props.size() != 4 || !props.containsKey(SALT) || !props.containsKey(STORED_KEY) || !props.containsKey(SERVER_KEY) || !props.containsKey(ITERATIONS)) { throw new IllegalArgumentException("Credentials not valid: " + str); } byte[] salt = Base64.getDecoder().decode(props.getProperty(SALT)); byte[] storedKey = Base64.getDecoder().decode(props.getProperty(STORED_KEY)); byte[] serverKey = Base64.getDecoder().decode(props.getProperty(SERVER_KEY)); int iterations = Integer.parseInt(props.getProperty(ITERATIONS)); return new ScramCredential(salt, storedKey, serverKey, iterations); } private static Properties toProps(String str) { Properties props = new Properties(); String[] tokens = str.split(","); for (String token : tokens) { int index = token.indexOf('='); if (index <= 0) throw new IllegalArgumentException("Credentials not valid: " + str); props.put(token.substring(0, index), token.substring(index + 1)); } return props; } public static void createCache(CredentialCache cache, Collection mechanisms) { for (String mechanism : ScramMechanism.mechanismNames()) { if (mechanisms.contains(mechanism)) cache.createCache(mechanism, ScramCredential.class); } } }




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