test/java/util/jar/JarEntry/GetMethodsReturnClones.java

/*
 * Copyright (c) 2005, 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 6337925
 * @summary Ensure that callers cannot modify the internal JarEntry cert and
 *          codesigner arrays.
 * @author Sean Mullan
 */
import java.io.InputStream;
import java.security.CodeSigner;
import java.security.cert.Certificate;
import java.util.*;
import java.util.jar.*;

public class GetMethodsReturnClones {

    private final static String BASE = System.getProperty("test.src", ".") +
        System.getProperty("file.separator");

    public static void main(String[] args) throws Exception {
        JarFile jf = new JarFile(BASE + "test.jar", true);

        byte[] buffer = new byte[8192];
        Enumeration<JarEntry> e = jf.entries();
        List<JarEntry> entries = new ArrayList<JarEntry>();
        while (e.hasMoreElements()) {
            JarEntry je = e.nextElement();
            entries.add(je);
            InputStream is = jf.getInputStream(je);
            while (is.read(buffer, 0, buffer.length) != -1) {
                // we just read. this will throw a SecurityException
                // if  a signature/digest check fails.
            }
            is.close();
        }
        jf.close();

        for (JarEntry je : entries) {
            Certificate[] certs = je.getCertificates();
            CodeSigner[] signers = je.getCodeSigners();
            if (certs != null) {
                certs[0] = null;
                certs = je.getCertificates();
                if (certs[0] == null) {
                    throw new Exception("Modified internal certs array");
                }
            }
            if (signers != null) {
                signers[0] = null;
                signers = je.getCodeSigners();
                if (signers[0] == null) {
                    throw new Exception("Modified internal codesigners array");
                }
            }
        }
    }
}