Java example source code file (SaslGSS.java)

This example Java source code file (SaslGSS.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

authorizecallback, bytearrayoutputstream, exception, gsscontext, gssmanager, handler, hashmap, krb5srv04, log, logging, messageprop, null, printstream, realmcallback, string, unsupportedcallbackexception, util

The SaslGSS.java Java example source code

/*
 * Copyright (c) 2013, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test
 * @bug 8012082 8019267
 * @summary SASL: auth-conf negotiated, but unencrypted data is accepted,
  *         reset to unencrypt
 * @compile -XDignore.symbol.file SaslGSS.java
 * @run main/othervm SaslGSS
 */

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.sasl.AuthorizeCallback;
import javax.security.sasl.RealmCallback;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslServer;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.HashMap;
import java.util.Locale;
import java.util.logging.ConsoleHandler;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.ietf.jgss.*;
import sun.security.jgss.GSSUtil;

public class SaslGSS {

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

        String name = "host." + OneKDC.REALM.toLowerCase(Locale.US);

        new OneKDC(null).writeJAASConf();
        System.setProperty("javax.security.auth.useSubjectCredsOnly", "false");

        // Client in JGSS so that it can control wrap privacy mode
        GSSManager m = GSSManager.getInstance();
        GSSContext sc = m.createContext(
                        m.createName(OneKDC.SERVER, GSSUtil.NT_GSS_KRB5_PRINCIPAL),
                        GSSUtil.GSS_KRB5_MECH_OID,
                        null,
                        GSSContext.DEFAULT_LIFETIME);
        sc.requestMutualAuth(false);

        // Server in SASL
        final HashMap props = new HashMap();
        props.put(Sasl.QOP, "auth-conf");
        SaslServer ss = Sasl.createSaslServer("GSSAPI", "server",
                name, props,
                new CallbackHandler() {
                    public void handle(Callback[] callbacks)
                            throws IOException, UnsupportedCallbackException {
                        for (Callback cb : callbacks) {
                            if (cb instanceof RealmCallback) {
                                ((RealmCallback) cb).setText(OneKDC.REALM);
                            } else if (cb instanceof AuthorizeCallback) {
                                ((AuthorizeCallback) cb).setAuthorized(true);
                            }
                        }
                    }
                });

        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        PrintStream oldErr = System.err;
        System.setErr(new PrintStream(bout));

        Logger.getLogger("javax.security.sasl").setLevel(Level.ALL);
        Handler h = new ConsoleHandler();
        h.setLevel(Level.ALL);
        Logger.getLogger("javax.security.sasl").addHandler(h);

        byte[] token = new byte[0];

        try {
            // Handshake
            token = sc.initSecContext(token, 0, token.length);
            token = ss.evaluateResponse(token);
            token = sc.unwrap(token, 0, token.length, new MessageProp(0, false));
            token[0] = (byte)(((token[0] & 4) != 0) ? 4 : 2);
            token = sc.wrap(token, 0, token.length, new MessageProp(0, false));
            ss.evaluateResponse(token);
        } finally {
            System.setErr(oldErr);
        }

        // Talk
        // 1. Client sends a auth-int message
        byte[] hello = "hello".getBytes();
        MessageProp qop = new MessageProp(0, false);
        token = sc.wrap(hello, 0, hello.length, qop);
        // 2. Server accepts it anyway
        ss.unwrap(token, 0, token.length);
        // 3. Server sends a message
        token = ss.wrap(hello, 0, hello.length);
        // 4. Client accepts, should be auth-conf
        sc.unwrap(token, 0, token.length, qop);
        if (!qop.getPrivacy()) {
            throw new Exception();
        }

        for (String s: bout.toString().split("\\n")) {
            if (s.contains("KRB5SRV04") && s.contains("NULL")) {
                return;
            }
        }
        System.out.println("=======================");
        System.out.println(bout.toString());
        System.out.println("=======================");
        throw new Exception("Haven't seen KRB5SRV04 with NULL");
    }
}