Dépôt officiel du code source de l'ERP OpenConcerto

/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved.

 *

 * The contents of this file are subject to the terms of the GNU General Public License Version 3

 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a

 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific

 * language governing permissions and limitations under the License.

 *

 * When distributing the software, include this License Header Notice in each file.

 */

 package org.openconcerto.utils;

import java.io.BufferedReader;

import java.io.ByteArrayInputStream;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;

import java.security.GeneralSecurityException;

import java.security.KeyFactory;

import java.security.KeyStore;

import java.security.NoSuchAlgorithmException;

import java.security.PrivateKey;

import java.security.cert.CertificateException;

import java.security.cert.CertificateFactory;

import java.security.cert.X509Certificate;

import java.security.interfaces.RSAPrivateKey;

import java.security.spec.InvalidKeySpecException;

import java.security.spec.PKCS8EncodedKeySpec;

import java.util.ArrayList;

import java.util.List;

import javax.net.ssl.KeyManager;

import javax.net.ssl.KeyManagerFactory;

import javax.net.ssl.SSLContext;

import javax.net.ssl.SSLServerSocketFactory;

import javax.xml.bind.DatatypeConverter;

public class PEMImporter {

    public static SSLServerSocketFactory createSSLFactory(File privateKeyPem, File certificatePem, String password) throws IOException, GeneralSecurityException {

        final SSLContext context = SSLContext.getInstance("TLS");

        final KeyStore keystore = createKeyStore(privateKeyPem, certificatePem, password);

        final KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");

        kmf.init(keystore, password.toCharArray());

        final KeyManager[] km = kmf.getKeyManagers();

        context.init(km, null, null);

        return context.getServerSocketFactory();

    }

    /**

     * Create a KeyStore from standard PEM files

     *

     * @param privateKeyPem the private key PEM file

     * @param certificatePem the certificate(s) PEM file

     * @param the password to set to protect the private key

     */

    public static KeyStore createKeyStore(File privateKeyPem, File certificatePem, final String password) throws IOException, GeneralSecurityException {

        if (!privateKeyPem.exists()) {

            throw new IllegalArgumentException("private key file missing : " + privateKeyPem.getAbsolutePath());

        }

        if (!certificatePem.exists()) {

            throw new IllegalArgumentException("certificate file missing : " + certificatePem.getAbsolutePath());

        }

        final X509Certificate[] cert = createCertificates(certificatePem);

        final KeyStore keystore = KeyStore.getInstance("JKS");

        keystore.load(null);

        // Import private key

        final PrivateKey key = createPrivateKey(privateKeyPem);

        keystore.setKeyEntry(privateKeyPem.getName(), key, password.toCharArray(), cert);

        return keystore;

    }

    private static PrivateKey createPrivateKey(File privateKeyPem) throws IOException, GeneralSecurityException {

        final BufferedReader r = new BufferedReader(new FileReader(privateKeyPem));

        String s = r.readLine();

        if (s == null || !s.contains("BEGIN PRIVATE KEY")) {

            r.close();

            throw new IllegalArgumentException("No PRIVATE KEY found");

        }

        final StringBuilder b = new StringBuilder();

        s = "";

        while (s != null) {

            if (s.contains("END PRIVATE KEY")) {

                break;

            }

            b.append(s);

            s = r.readLine();

        }

        r.close();

        final String hexString = b.toString();

        final byte[] bytes = DatatypeConverter.parseBase64Binary(hexString);

        return generatePrivateKeyFromDER(bytes);

    }

    private static X509Certificate[] createCertificates(File certificatePem) throws IOException, CertificateException {

        final List<X509Certificate> result = new ArrayList<X509Certificate>();

        final BufferedReader r = new BufferedReader(new FileReader(certificatePem));

        String s = r.readLine();

        if (s == null || !s.contains("BEGIN CERTIFICATE")) {

            r.close();

            throw new IllegalArgumentException("No CERTIFICATE found");

        }

        StringBuilder b = new StringBuilder();

        while (s != null) {

            if (s.contains("END CERTIFICATE")) {

                String hexString = b.toString();

                final byte[] bytes = DatatypeConverter.parseBase64Binary(hexString);

                X509Certificate cert = generateCertificateFromDER(bytes);

                result.add(cert);

                b = new StringBuilder();

            } else {

                if (!s.startsWith("----")) {

                    b.append(s);

                }

            }

            s = r.readLine();

        }

        r.close();

        return result.toArray(new X509Certificate[result.size()]);

    }

    private static RSAPrivateKey generatePrivateKeyFromDER(byte[] keyBytes) throws InvalidKeySpecException, NoSuchAlgorithmException {

        final PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);

        final KeyFactory factory = KeyFactory.getInstance("RSA");

        return (RSAPrivateKey) factory.generatePrivate(spec);

    }

    private static X509Certificate generateCertificateFromDER(byte[] certBytes) throws CertificateException {

        final CertificateFactory factory = CertificateFactory.getInstance("X.509");

        return (X509Certificate) factory.generateCertificate(new ByteArrayInputStream(certBytes));

    }

}