Hasher.java

/*
 * Copyright 2015-2018 _floragunn_ GmbH
 * Licensed 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.
 */

/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 *
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.security.tools;

import java.io.Console;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.Objects;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.DefaultParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.bouncycastle.crypto.generators.OpenBSDBCrypt;

public class Hasher {

    public static void main(final String[] args) {

        final Options options = new Options();
        final HelpFormatter formatter = new HelpFormatter();
        options.addOption(Option.builder("p").argName("password").hasArg().desc("Cleartext password to hash").build());
        options.addOption(
            Option.builder("env")
                .argName("name environment variable")
                .hasArg()
                .desc("name environment variable to read password from")
                .build()
        );

        final CommandLineParser parser = new DefaultParser();
        try {
            final CommandLine line = parser.parse(options, args);

            if (line.hasOption("p")) {
                System.out.println(hash(line.getOptionValue("p").toCharArray()));
            } else if (line.hasOption("env")) {
                final String pwd = System.getenv(line.getOptionValue("env"));
                if (pwd == null || pwd.isEmpty()) {
                    throw new Exception("No environment variable '" + line.getOptionValue("env") + "' set");
                }
                System.out.println(hash(pwd.toCharArray()));
            } else {
                final Console console = System.console();
                if (console == null) {
                    throw new Exception("Cannot allocate a console");
                }
                final char[] passwd = console.readPassword("[%s]", "Password:");
                System.out.println(hash(passwd));
            }
        } catch (final Exception exp) {
            System.err.println("Parsing failed.  Reason: " + exp.getMessage());
            formatter.printHelp("hash.sh", options, true);
            System.exit(-1);
        }
    }

    public static String hash(final char[] clearTextPassword) {
        final byte[] salt = new byte[16];
        new SecureRandom().nextBytes(salt);
        final String hash = OpenBSDBCrypt.generate((Objects.requireNonNull(clearTextPassword)), salt, 12);
        Arrays.fill(salt, (byte) 0);
        Arrays.fill(clearTextPassword, '\0');
        return hash;
    }
}