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iText, a free Java-PDF library
/*
* $Id: CrlClientOnline.java 6134 2013-12-23 13:15:14Z blowagie $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2014 iText Group NV
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf.security;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.cert.Certificate;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import com.itextpdf.text.error_messages.MessageLocalization;
import com.itextpdf.text.log.Logger;
import com.itextpdf.text.log.LoggerFactory;
/**
* An implementation of the CrlClient that fetches the CRL bytes
* from an URL.
* @author Paulo Soares
*/
public class CrlClientOnline implements CrlClient {
/** The Logger instance. */
private static final Logger LOGGER = LoggerFactory.getLogger(CrlClientOnline.class);
/** The URLs of the CRLs. */
protected List urls = new ArrayList();
/**
* Creates a CrlClientOnline instance that will try to find
* a single CRL by walking through the certificate chain.
*/
public CrlClientOnline() {
}
/**
* Creates a CrlClientOnline instance using one or more URLs.
*/
public CrlClientOnline(String... crls) {
for (String url : crls) {
addUrl(url);
}
}
/**
* Creates a CrlClientOnline instance using one or more URLs.
*/
public CrlClientOnline(URL... crls) {
for (URL url : urls) {
addUrl(url);
}
}
/**
* Creates a CrlClientOnline instance using a certificate chain.
*/
public CrlClientOnline(Certificate[] chain) {
for (int i = 0; i < chain.length; i++) {
X509Certificate cert = (X509Certificate)chain[i];
LOGGER.info("Checking certificate: " + cert.getSubjectDN());
try {
addUrl(CertificateUtil.getCRLURL(cert));
} catch (CertificateParsingException e) {
LOGGER.info("Skipped CRL url (certificate could not be parsed)");
}
}
}
/**
* Adds an URL to the list of CRL URLs
* @param url an URL in the form of a String
*/
protected void addUrl(String url) {
try {
addUrl(new URL(url));
} catch (MalformedURLException e) {
LOGGER.info("Skipped CRL url (malformed): " + url);
}
}
/**
* Adds an URL to the list of CRL URLs
* @param url an URL object
*/
protected void addUrl(URL url) {
if (urls.contains(url)) {
LOGGER.info("Skipped CRL url (duplicate): " + url);
return;
}
urls.add(url);
LOGGER.info("Added CRL url: " + url);
}
/**
* Fetches the CRL bytes from an URL.
* If no url is passed as parameter, the url will be obtained from the certificate.
* If you want to load a CRL from a local file, subclass this method and pass an
* URL with the path to the local file to this method. An other option is to use
* the CrlClientOffline class.
* @see com.itextpdf.text.pdf.security.CrlClient#getEncoded(java.security.cert.X509Certificate, java.lang.String)
*/
public Collection getEncoded(X509Certificate checkCert, String url) {
if (checkCert == null)
return null;
List urllist = new ArrayList(urls);
if (urllist.size() == 0) {
LOGGER.info("Looking for CRL for certificate " + checkCert.getSubjectDN());
try {
if (url == null)
url = CertificateUtil.getCRLURL(checkCert);
if (url == null)
throw new NullPointerException();
urllist.add(new URL(url));
LOGGER.info("Found CRL url: " + url);
}
catch (Exception e) {
LOGGER.info("Skipped CRL url: " + e.getMessage());
}
}
ArrayList ar = new ArrayList();
for (URL urlt : urllist) {
try {
LOGGER.info("Checking CRL: " + urlt);
HttpURLConnection con = (HttpURLConnection)urlt.openConnection();
if (con.getResponseCode() / 100 != 2) {
throw new IOException(MessageLocalization.getComposedMessage("invalid.http.response.1", con.getResponseCode()));
}
//Get Response
InputStream inp = (InputStream) con.getContent();
byte[] buf = new byte[1024];
ByteArrayOutputStream bout = new ByteArrayOutputStream();
while (true) {
int n = inp.read(buf, 0, buf.length);
if (n <= 0)
break;
bout.write(buf, 0, n);
}
inp.close();
ar.add(bout.toByteArray());
LOGGER.info("Added CRL found at: " + urlt);
}
catch (Exception e) {
LOGGER.info("Skipped CRL: " + e.getMessage() + " for " + urlt);
}
}
return ar;
}
}