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Java example source code file (NoExtensions.java)

This example Java source code file (NoExtensions.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

arraylist, begin, bytearrayinputstream, certificate\-\-\-\-\-\\n, certificatefactory, collectioncertstoreparameters, end, exception, hashset, noextensions, pkixbuilderparameters, string, util, x509certificate, x509certselector

The NoExtensions.java Java example source code

/*
 * Copyright (c) 2001, 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 4519462
 * @summary Verify Sun CertPathBuilder implementation handles certificates with no extensions
 */

import java.security.cert.X509Certificate;
import java.security.cert.TrustAnchor;
import java.security.cert.CollectionCertStoreParameters;
import java.security.cert.CertStore;
import java.security.cert.X509CertSelector;
import java.security.cert.CertPathBuilder;
import java.security.cert.PKIXBuilderParameters;
import java.security.cert.CertPathBuilderResult;
import java.security.cert.CertificateFactory;
import java.security.cert.CRL;
import java.security.cert.CertPath;
import java.util.HashSet;
import java.util.ArrayList;
import java.io.ByteArrayInputStream;

// Test based on user code submitted with bug by daniel.boggs@compass.net
public class NoExtensions {

    public static void main(String[] args) {
        try {
            NoExtensions certs = new NoExtensions();

            // the first certificate has the Authority Key Identifier extension
            certs.doBuild(getUserCertificate1());
            System.out.println("successfully built path for the first certificate");

            // the second certificate does not have the Authority Key Identifier extension
            // this will not succeed
            certs.doBuild(getUserCertificate2());
            System.out.println("successfully built path for the second certificate");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    private void doBuild(X509Certificate userCert) throws Exception {
        // get the set of trusted CA certificates (only one in this instance)
        HashSet trustAnchors = new HashSet();
        X509Certificate trustedCert = getTrustedCertificate();
        trustAnchors.add(new TrustAnchor(trustedCert, null));

        // put together a CertStore (repository of the certificates and CRLs)
        ArrayList certs = new ArrayList();
        certs.add(trustedCert);
        certs.add(userCert);
        CollectionCertStoreParameters certStoreParams = new CollectionCertStoreParameters(certs);
        CertStore certStore = CertStore.getInstance("Collection", certStoreParams);

        // specify the target certificate via a CertSelector
        X509CertSelector certSelector = new X509CertSelector();
        certSelector.setCertificate(userCert);
        certSelector.setSubject(userCert.getSubjectDN().getName()); // seems to be required

        // build a valid cerificate path
        CertPathBuilder certPathBuilder = CertPathBuilder.getInstance("PKIX", "SUN");
        PKIXBuilderParameters certPathBuilderParams = new PKIXBuilderParameters(trustAnchors, certSelector);
        certPathBuilderParams.addCertStore(certStore);
        certPathBuilderParams.setRevocationEnabled(false);
        CertPathBuilderResult result = certPathBuilder.build(certPathBuilderParams);

        // get and show cert path
        CertPath certPath = result.getCertPath();
//        System.out.println(certPath.toString());
    }

    private static X509Certificate getTrustedCertificate() throws Exception {
        String sCert =
            "-----BEGIN CERTIFICATE-----\n"
          + "MIIBezCCASWgAwIBAgIQyWD8dLUoqpJFyDxrfRlrsTANBgkqhkiG9w0BAQQFADAW\n"
          + "MRQwEgYDVQQDEwtSb290IEFnZW5jeTAeFw0wMTEwMTkxMjU5MjZaFw0zOTEyMzEy\n"
          + "MzU5NTlaMBoxGDAWBgNVBAMTD1Jvb3RDZXJ0aWZpY2F0ZTBcMA0GCSqGSIb3DQEB\n"
          + "AQUAA0sAMEgCQQC+NFKszPjatUZKWmyWaFjir1wB93FX2u5SL+GMjgUsMs1JcTKQ\n"
          + "Kh0cnnQKknNkV4cTW4NPn31YCoB1+0KA3mknAgMBAAGjSzBJMEcGA1UdAQRAMD6A\n"
          + "EBLkCS0GHR1PAI1hIdwWZGOhGDAWMRQwEgYDVQQDEwtSb290IEFnZW5jeYIQBjds\n"
          + "AKoAZIoRz7jUqlw19DANBgkqhkiG9w0BAQQFAANBACJxAfP57yqaT9N+nRgAOugM\n"
          + "JG0aN3/peCIvL3p29epRL2xoWFvxpUUlsH2I39OZ6b8+twWCebhkv1I62segXAk=\n"
          + "-----END CERTIFICATE-----";
        CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
        ByteArrayInputStream bytes = new ByteArrayInputStream(sCert.getBytes());
        return (X509Certificate)certFactory.generateCertificate(bytes);
    }

    private static X509Certificate getUserCertificate1() throws Exception {
        // this certificate includes an extension
        String sCert =
            "-----BEGIN CERTIFICATE-----\n"
          + "MIIBfzCCASmgAwIBAgIQWFSKzCWO2ptOAc2F3MKZSzANBgkqhkiG9w0BAQQFADAa\n"
          + "MRgwFgYDVQQDEw9Sb290Q2VydGlmaWNhdGUwHhcNMDExMDE5MTMwNzQxWhcNMzkx\n"
          + "MjMxMjM1OTU5WjAaMRgwFgYDVQQDEw9Vc2VyQ2VydGlmaWNhdGUwXDANBgkqhkiG\n"
          + "9w0BAQEFAANLADBIAkEA24gypa2YFGZHKznEWWbqIWNVXCM35W7RwJwhGpNsuBCj\n"
          + "NT6KEo66F+OOMgZmb0KrEZHBJASJ3n4Cqbt4aHm/2wIDAQABo0swSTBHBgNVHQEE\n"
          + "QDA+gBBch+eYzOPgVRbMq5vGpVWooRgwFjEUMBIGA1UEAxMLUm9vdCBBZ2VuY3mC\n"
          + "EMlg/HS1KKqSRcg8a30Za7EwDQYJKoZIhvcNAQEEBQADQQCYBIHBqQQJePi5Hzfo\n"
          + "CxeUaYlXmvbxVNkxM65Pplsj3h4ntfZaynmlhahH3YsnnA8wk6xPt04LjSId12RB\n"
          + "PeuO\n"
          + "-----END CERTIFICATE-----";
        CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
        ByteArrayInputStream bytes = new ByteArrayInputStream(sCert.getBytes());
        return (X509Certificate)certFactory.generateCertificate(bytes);
    }

    private static X509Certificate getUserCertificate2() throws Exception {
        // this certificate does not include any extensions
        String sCert =
            "-----BEGIN CERTIFICATE-----\n"
          + "MIIBMjCB3aADAgECAhB6225ckZVssEukPuvk1U1PMA0GCSqGSIb3DQEBBAUAMBox\n"
          + "GDAWBgNVBAMTD1Jvb3RDZXJ0aWZpY2F0ZTAeFw0wMTEwMTkxNjA5NTZaFw0wMjEw\n"
          + "MTkyMjA5NTZaMBsxGTAXBgNVBAMTEFVzZXJDZXJ0aWZpY2F0ZTIwXDANBgkqhkiG\n"
          + "9w0BAQEFAANLADBIAkEAzicGiW9aUlUoQIZnLy1l8MMV5OvA+4VJ4T/xo/PpN8Oq\n"
          + "WgZVGKeEp6JCzMlXEJk3TGLfpXL4Ytw+Ldhv0QPhLwIDAnMpMA0GCSqGSIb3DQEB\n"
          + "BAUAA0EAQmj9SFHEx66JyAps3ew4pcSS3QvfVZ/6qsNUYCG75rFGcTUPHcXKql9y\n"
          + "qBT83iNLJ//krjw5Ju0WRPg/buHSww==\n"
          + "-----END CERTIFICATE-----";
        CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
        ByteArrayInputStream bytes = new ByteArrayInputStream(sCert.getBytes());
        return (X509Certificate)certFactory.generateCertificate(bytes);
    }
}

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