/*

 * 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 DynamicKeytab.java

 */

import java.io.File;

import java.io.FileOutputStream;

import java.nio.file.Files;

import java.nio.file.Paths;

import org.ietf.jgss.GSSException;

import sun.security.jgss.GSSUtil;

import sun.security.krb5.KrbException;

import sun.security.krb5.internal.Krb5;

public class DynamicKeytab {

    Context c, s;

    public static void main(String[] args)

            throws Exception {

        new DynamicKeytab().go();

    }

    void go() throws Exception {

        OneKDC k = new OneKDC(null);

        k.writeJAASConf();

        Files.delete(Paths.get(OneKDC.KTAB));

        // Starts with no keytab

        c = Context.fromJAAS("client");

        s = Context.fromJAAS("com.sun.security.jgss.krb5.accept");

        // Test 1: read new key 1 from keytab

        k.addPrincipal(OneKDC.SERVER, "pass1".toCharArray());

        k.writeKtab(OneKDC.KTAB);

        connect();

        // Test 2: service key cached, find 1 in keytab (now contains 1 and 2)

        k.addPrincipal(OneKDC.SERVER, "pass2".toCharArray());

        k.appendKtab(OneKDC.KTAB);

        connect();

        // Test 3: re-login. Now find 2 in keytab

        c = Context.fromJAAS("client");

        connect();

        // Test 4: re-login, KDC use 3 this time.

        c = Context.fromJAAS("client");

        // Put 3 and 4 into keytab but keep the real key back to 3.

        k.addPrincipal(OneKDC.SERVER, "pass3".toCharArray());

        k.appendKtab(OneKDC.KTAB);

        k.addPrincipal(OneKDC.SERVER, "pass4".toCharArray());

        k.appendKtab(OneKDC.KTAB);

        k.addPrincipal(OneKDC.SERVER, "pass3".toCharArray());

        connect();

        // Test 5: invalid keytab file, should ignore

        try (FileOutputStream fos = new FileOutputStream(OneKDC.KTAB)) {

            fos.write("BADBADBAD".getBytes());

        }

        connect();

        // Test 6: delete keytab file, identical to revoke all

        Files.delete(Paths.get(OneKDC.KTAB));

        try {

            connect();

            throw new Exception("Should not success");

        } catch (GSSException gsse) {

            System.out.println(gsse);

            KrbException ke = (KrbException)gsse.getCause();

            // KrbApReq.authenticate(*) if (dkey == null)...

            // This should have been Krb5.KRB_AP_ERR_NOKEY

            if (ke.returnCode() != Krb5.API_INVALID_ARG) {

                throw new Exception("Not expected failure code: " +

                        ke.returnCode());

            }

        }

        // Test 7: 3 revoked, should fail (now contains only 5)

        k.addPrincipal(OneKDC.SERVER, "pass5".toCharArray());

        k.writeKtab(OneKDC.KTAB);   // overwrite keytab, which means

                                    // old key is revoked

        try {

            connect();

            throw new Exception("Should not success");

        } catch (GSSException gsse) {

            System.out.println(gsse);

            // Since 7197159, different kvno is accepted, this return code

            // will never be thrown out again.

            //KrbException ke = (KrbException)gsse.getCause();

            //if (ke.returnCode() != Krb5.KRB_AP_ERR_BADKEYVER) {

            //    throw new Exception("Not expected failure code: " +

            //            ke.returnCode());

            //}

        }

        // Test 8: an empty KDC means revoke all

        KDC.create("EMPTY.REALM").writeKtab(OneKDC.KTAB);

        try {

            connect();

            throw new Exception("Should not success");

        } catch (GSSException gsse) {

            System.out.println(gsse);

            KrbException ke = (KrbException)gsse.getCause();

            // KrbApReq.authenticate(*) if (dkey == null)...

            // This should have been Krb5.KRB_AP_ERR_NOKEY

            if (ke.returnCode() != Krb5.API_INVALID_ARG) {

                throw new Exception("Not expected failure code: " +

                        ke.returnCode());

            }

        }

    }

    void connect() throws Exception {

        Thread.sleep(2000);     // make sure ktab timestamp is different

        c.startAsClient(OneKDC.SERVER, GSSUtil.GSS_KRB5_MECH_OID);

        s.startAsServer(GSSUtil.GSS_KRB5_MECH_OID);

        Context.handshake(c, s);

    }

}