/*

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @compile -XDignore.symbol.file CrossRealm.java

 */

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.security.Security;

import javax.security.auth.callback.Callback;

import javax.security.auth.callback.CallbackHandler;

import javax.security.auth.callback.NameCallback;

import javax.security.auth.callback.PasswordCallback;

import javax.security.auth.callback.UnsupportedCallbackException;

import org.ietf.jgss.GSSContext;

import org.ietf.jgss.GSSManager;

import org.ietf.jgss.GSSName;

import sun.security.jgss.GSSUtil;

public class CrossRealm implements CallbackHandler {

    public static void main(String[] args) throws Exception {

        startKDCs();

        xRealmAuth();

    }

    static void startKDCs() throws Exception {

        // Create and start the KDC

        KDC kdc1 = KDC.create("RABBIT.HOLE");

        kdc1.addPrincipal("dummy", "bogus".toCharArray());

        kdc1.addPrincipalRandKey("krbtgt/RABBIT.HOLE");

        kdc1.addPrincipal("krbtgt/SNAKE.HOLE@RABBIT.HOLE",

                "rabbit->snake".toCharArray());

        KDC kdc2 = KDC.create("SNAKE.HOLE");

        kdc2.addPrincipalRandKey("krbtgt/SNAKE.HOLE");

        kdc2.addPrincipal("krbtgt/SNAKE.HOLE@RABBIT.HOLE",

                "rabbit->snake".toCharArray());

        kdc2.addPrincipalRandKey("host/www.snake.hole");

        KDC.saveConfig("krb5-localkdc.conf", kdc1, kdc2,

                "forwardable=true",

                "[domain_realm]",

                ".snake.hole=SNAKE.HOLE");

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

    }

    static void xRealmAuth() throws Exception {

        Security.setProperty("auth.login.defaultCallbackHandler", "CrossRealm");

        System.setProperty("java.security.auth.login.config", "jaas-localkdc.conf");

        System.setProperty("javax.security.auth.useSubjectCredsOnly", "false");

        FileOutputStream fos = new FileOutputStream("jaas-localkdc.conf");

        fos.write(("com.sun.security.jgss.krb5.initiate {\n" +

                "    com.sun.security.auth.module.Krb5LoginModule\n" +

                "    required\n" +

                "    principal=dummy\n" +

                "    doNotPrompt=false\n" +

                "    useTicketCache=false\n" +

                "    ;\n" +

                "};").getBytes());

        fos.close();

        GSSManager m = GSSManager.getInstance();

        m.createContext(

                m.createName("host@www.snake.hole", GSSName.NT_HOSTBASED_SERVICE),

                GSSUtil.GSS_KRB5_MECH_OID,

                null,

                GSSContext.DEFAULT_LIFETIME).initSecContext(new byte[0], 0, 0);

    }

    @Override

    public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {

        for (Callback callback : callbacks) {

            if (callback instanceof NameCallback) {

                ((NameCallback) callback).setName("dummy");

            }

            if (callback instanceof PasswordCallback) {

                ((PasswordCallback) callback).setPassword("bogus".toCharArray());

            }

        }

    }

}