/*

 * 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.

 *

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/*

 * @test

 * @summary Introduce constrained Kerberos delegation

 * @compile -XDignore.symbol.file S4U2proxyGSS.java

 */

import java.io.File;

import java.io.FileOutputStream;

import java.security.Security;

import java.util.Arrays;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.ietf.jgss.Oid;

import sun.security.jgss.GSSUtil;

public class S4U2proxyGSS {

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

        Oid mech;

        if (args[0].equals("spnego")) {

            mech = GSSUtil.GSS_SPNEGO_MECH_OID;

        } else if (args[0].contains("krb5")) {

            mech = GSSUtil.GSS_KRB5_MECH_OID;

        } else {

            throw new Exception("Unknown mech");

        }

        OneKDC kdc = new OneKDC(null);

        kdc.writeJAASConf();

        kdc.setOption(KDC.Option.PREAUTH_REQUIRED, false);

        Map<String,List<String>> map = new HashMap<>();

        map.put(OneKDC.SERVER + "@" + OneKDC.REALM, Arrays.asList(

                new String[]{OneKDC.SERVER + "@" + OneKDC.REALM}));

        kdc.setOption(KDC.Option.ALLOW_S4U2PROXY, map);

        Context c, s, b;

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

        System.setProperty("java.security.auth.login.config", OneKDC.JAAS_CONF);

        File f = new File(OneKDC.JAAS_CONF);

        FileOutputStream fos = new FileOutputStream(f);

        fos.write((

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

                "    com.sun.security.auth.module.Krb5LoginModule required;\n};\n" +

                "com.sun.security.jgss.krb5.accept {\n" +

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

                "    principal=\"" + OneKDC.SERVER + "\"\n" +

                "    useKeyTab=true\n" +

                "    storeKey=true;\n};\n"

                ).getBytes());

        fos.close();

        Security.setProperty("auth.login.defaultCallbackHandler", "OneKDC$CallbackForClient");

        c = Context.fromThinAir();

        s = Context.fromThinAir();

        b = Context.fromThinAir();

        c.startAsClient(OneKDC.SERVER, mech);

        c.x().requestCredDeleg(false);

        s.startAsServer(mech);

        Context.handshake(c, s);

        Context p = s.delegated();

        p.startAsClient(OneKDC.SERVER, mech);

        b.startAsServer(mech);

        Context.handshake(p, b);

        String n1 = p.x().getSrcName().toString().split("@")[0];

        String n2 = b.x().getSrcName().toString().split("@")[0];

        if (!n1.equals(OneKDC.USER) || !n2.equals(OneKDC.USER)) {

            throw new Exception("Delegation failed");

        }

    }

}