ForwardableCheck.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 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
 * @bug 8022582
 * @summary Relax response flags checking in sun.security.krb5.KrbKdcRep.check.
 * @compile -XDignore.symbol.file ForwardableCheck.java
 * @run main/othervm -Dsun.net.spi.nameservice.provider.1=ns,mock ForwardableCheck
 */

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

import java.util.Arrays;

public class ForwardableCheck {

    public static void main(String[] args) throws Exception {
        OneKDC kdc = new OneKDC(null);
        kdc.writeJAASConf();

        // USER can impersonate someone else
        kdc.setOption(KDC.Option.ALLOW_S4U2SELF,
                Arrays.asList(OneKDC.USER + "@" + OneKDC.REALM));
        // USER2 is sensitive
        kdc.setOption(KDC.Option.SENSITIVE_ACCOUNTS,
                Arrays.asList(OneKDC.USER2 + "@" + OneKDC.REALM));

        Context c;

        // USER2 is sensitive but it's still able to get a normal ticket
        c = Context.fromUserPass(OneKDC.USER2, OneKDC.PASS2, false);

        // ... and connect to another account
        c.startAsClient(OneKDC.USER, GSSUtil.GSS_KRB5_MECH_OID);
        c.x().requestCredDeleg(true);
        c.x().requestMutualAuth(false);

        c.take(new byte[0]);

        if (!c.x().isEstablished()) {
            throw new Exception("Context should have been established");
        }

        // ... but will not be able to delegate itself
        if (c.x().getCredDelegState()) {
            throw new Exception("Impossible");
        }

        // Although USER is allowed to impersonate other people,
        // it cannot impersonate USER2 coz it's sensitive.
        c = Context.fromUserPass(OneKDC.USER, OneKDC.PASS, false);
        try {
            c.impersonate(OneKDC.USER2);
            throw new Exception("Should fail");
        } catch (GSSException e) {
            e.printStackTrace();
        }
    }
}