/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.HashMap;

import java.util.Map;

import javax.security.auth.callback.CallbackHandler;

import javax.security.auth.login.LoginContext;

import javax.security.auth.login.LoginException;

/*

 * @test

 * @bug 4515853 8075297

 * @summary Checks that Kerberos client tries slave KDC

 *          if master KDC is not responding

 * @run main/othervm BogusKDC

 */

public class BogusKDC {

    static final String TEST_SRC = System.getProperty("test.src", ".");

    static final String HOST = "localhost";

    static final String NOT_EXISTING_HOST = "not.existing.host";

    static final String REALM = "TEST.REALM";

    static final String USER = "USER";

    static final String USER_PRINCIPAL = USER + "@" + REALM;

    static final String USER_PASSWORD = "password";

    static final String KRBTGT_PRINCIPAL = "krbtgt/" + REALM;

    static final String KRB5_CONF = "krb5.conf";

    static final int WRONG_KDC_PORT = 21;

    static final String KRB5_CONF_TEMPLATE = ""

            + "[libdefaults]\n"

            + "default_realm = TEST.REALM\n"

            + "max_retries = 1\n"

            + "\n"

            + "[realms]\n"

            + "TEST.REALM = {\n"

            + "    kdc = %s\n"

            + "    kdc = localhost:%d\n"

            + "}";

    public static void main(String[] args) throws LoginException, IOException {

        Map<String, String> principals = new HashMap<>();

        principals.put(USER_PRINCIPAL, USER_PASSWORD);

        principals.put(KRBTGT_PRINCIPAL, null);

        System.setProperty("java.security.krb5.conf", KRB5_CONF);

        // start a local KDC

        KDC kdc = KDC.startKDC(HOST, KRB5_CONF, REALM, principals, null, null);

        System.setProperty("java.security.auth.login.config",

                TEST_SRC + File.separator + "refreshKrb5Config.jaas");

        CallbackHandler handler = new Helper.UserPasswordHandler(

                USER, USER_PASSWORD);

        // create a krb5 config with non-existing host for master KDC,

        // and wrong port for slave KDC

        try (PrintWriter w = new PrintWriter(new FileWriter(KRB5_CONF))) {

            w.write(String.format(KRB5_CONF_TEMPLATE,

                    KDC.KDCNameService.NOT_EXISTING_HOST, WRONG_KDC_PORT));

            w.flush();

        }

        // login with not-refreshable config

        try {

            new LoginContext("NotRefreshable", handler).login();

            throw new RuntimeException("Expected exception not thrown");

        } catch (LoginException le) {

            System.out.println("Expected login failure: " + le);

        }

        // create a krb5 config with non-existing host for master KDC,

        // but correct port for slave KDC

        try (PrintWriter w = new PrintWriter(new FileWriter(KRB5_CONF))) {

            w.write(String.format(KRB5_CONF_TEMPLATE,

                    KDC.KDCNameService.NOT_EXISTING_HOST, kdc.getPort()));

            w.flush();

        }

        // login with not-refreshable config

        try {

            new LoginContext("NotRefreshable", handler).login();

            throw new RuntimeException("Expected exception not thrown");

        } catch (LoginException le) {

            System.out.println("Expected login failure: " + le);

        }

        // login with refreshable config

        new LoginContext("Refreshable", handler).login();

        System.out.println("Test passed");

    }

}