SunCertificateUtils.java

/*
 * This file is part of the OWASP Proxy, a free intercepting proxy library.
 * Copyright (C) 2008-2010 Rogan Dawes <rogan@dawes.za.net>
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to:
 * The Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

package org.owasp.proxy.util;

import java.io.IOException;
import java.math.BigInteger;
import java.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;
import java.util.Date;
import java.util.Vector;

import javax.security.auth.x500.X500Principal;

import sun.security.util.ObjectIdentifier;
import sun.security.x509.AlgorithmId;
import sun.security.x509.AuthorityKeyIdentifierExtension;
import sun.security.x509.BasicConstraintsExtension;
import sun.security.x509.CertificateAlgorithmId;
import sun.security.x509.CertificateExtensions;
import sun.security.x509.CertificateSerialNumber;
import sun.security.x509.CertificateValidity;
import sun.security.x509.CertificateVersion;
import sun.security.x509.CertificateX509Key;
import sun.security.x509.ExtendedKeyUsageExtension;
import sun.security.x509.KeyIdentifier;
import sun.security.x509.KeyUsageExtension;
import sun.security.x509.NetscapeCertTypeExtension;
import sun.security.x509.SubjectKeyIdentifierExtension;
import sun.security.x509.X500Name;
import sun.security.x509.X509CertImpl;
import sun.security.x509.X509CertInfo;

public class SunCertificateUtils {

	private static final String SIGALG = "SHA256withRSA";

	public static X509Certificate sign(X500Principal subject, PublicKey pubKey,
			X500Principal issuer, PublicKey caPubKey, PrivateKey caKey,
			Date begin, Date ends, BigInteger serialNo)
					throws GeneralSecurityException {

		try {
			X500Name subjectName = new X500Name(subject.getName());
			X500Name issuerName = new X500Name(issuer.getName());
			Signature signature = Signature.getInstance(SIGALG);

			signature.initSign(caKey);
			X500Signer signer = new X500Signer(signature, issuerName);

			CertificateValidity valid = new CertificateValidity(begin, ends);

			X509CertInfo info = new X509CertInfo();
			// Add all mandatory attributes
			info.set(X509CertInfo.VERSION, new CertificateVersion(
					CertificateVersion.V3));
			info.set(X509CertInfo.SERIAL_NUMBER, new CertificateSerialNumber(
					serialNo));
			AlgorithmId algID = signer.getAlgorithmId();
			info.set(X509CertInfo.ALGORITHM_ID, new CertificateAlgorithmId(
					algID));
			info.set(X509CertInfo.SUBJECT, issuerName);
			info.set(X509CertInfo.KEY, new CertificateX509Key(pubKey));
			info.set(X509CertInfo.VALIDITY, valid);
			info.set(X509CertInfo.ISSUER, issuerName);

			// add Extensions
			CertificateExtensions ext = (subject == issuer) ? getCACertificateExtensions()
					: getCertificateExtensions(pubKey, caPubKey);
			info.set(X509CertInfo.EXTENSIONS, ext);

			X509CertImpl cert = new X509CertImpl(info);
			cert.sign(caKey, SIGALG);

			return cert;
		} catch (IOException e) {
			throw new CertificateEncodingException("generate: "
					+ e.getMessage(), e);
		}
	}

	private static CertificateExtensions getCACertificateExtensions()
			throws IOException {
		CertificateExtensions ext = new CertificateExtensions();

		// Basic Constraints
		ext.set(BasicConstraintsExtension.NAME, new BasicConstraintsExtension(
				/* isCritical */true, /* isCA */true, 0));

		return ext;
	}

	private static CertificateExtensions getCertificateExtensions(
			PublicKey pubKey, PublicKey caPubKey) throws IOException {
		CertificateExtensions ext = new CertificateExtensions();

		ext.set(SubjectKeyIdentifierExtension.NAME,
				new SubjectKeyIdentifierExtension(new KeyIdentifier(pubKey)
						.getIdentifier()));

		ext.set(AuthorityKeyIdentifierExtension.NAME,
				new AuthorityKeyIdentifierExtension(
						new KeyIdentifier(caPubKey), null, null));

		// Basic Constraints
		ext.set(BasicConstraintsExtension.NAME, new BasicConstraintsExtension(
				/* isCritical */true, /* isCA */false, /* pathLen */5));

		// Netscape Cert Type Extension
		boolean[] ncteOk = new boolean[8];
		ncteOk[0] = true; // SSL_CLIENT
		ncteOk[1] = true; // SSL_SERVER
		NetscapeCertTypeExtension ncte = new NetscapeCertTypeExtension(ncteOk);
		ncte = new NetscapeCertTypeExtension(false, ncte.getExtensionValue());
		ext.set(NetscapeCertTypeExtension.NAME, ncte);

		// Key Usage Extension
		boolean[] kueOk = new boolean[9];
		kueOk[0] = true;
		kueOk[2] = true;
		// "digitalSignature", // (0),
		// "nonRepudiation", // (1)
		// "keyEncipherment", // (2),
		// "dataEncipherment", // (3),
		// "keyAgreement", // (4),
		// "keyCertSign", // (5),
		// "cRLSign", // (6),
		// "encipherOnly", // (7),
		// "decipherOnly", // (8)
		// "contentCommitment" // also (1)
		KeyUsageExtension kue = new KeyUsageExtension(kueOk);
		ext.set(KeyUsageExtension.NAME, kue);

		// Extended Key Usage Extension
		int[] serverAuthOidData = { 1, 3, 6, 1, 5, 5, 7, 3, 1 };
		ObjectIdentifier serverAuthOid = new ObjectIdentifier(serverAuthOidData);
		int[] clientAuthOidData = { 1, 3, 6, 1, 5, 5, 7, 3, 2 };
		ObjectIdentifier clientAuthOid = new ObjectIdentifier(clientAuthOidData);
		Vector<ObjectIdentifier> v = new Vector<ObjectIdentifier>();
		v.add(serverAuthOid);
		v.add(clientAuthOid);
		ExtendedKeyUsageExtension ekue = new ExtendedKeyUsageExtension(false, v);
		ext.set(ExtendedKeyUsageExtension.NAME, ekue);

		return ext;

	}



}