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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2021 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.signatures;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.net.URL;
import java.security.cert.CRL;
import java.security.cert.CRLException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERIA5String;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.x509.CRLDistPoint;
import org.bouncycastle.asn1.x509.DistributionPoint;
import org.bouncycastle.asn1.x509.DistributionPointName;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.GeneralNames;
/**
* This class contains a series of static methods that
* allow you to retrieve information from a Certificate.
*/
public class CertificateUtil {
// Certificate Revocation Lists
/**
* Gets a CRL from an X509 certificate.
*
* @param certificate the X509Certificate to extract the CRL from
* @return CRL or null if there's no CRL available
* @throws IOException thrown when the URL couldn't be opened properly.
* @throws CertificateException thrown if there's no X509 implementation in the provider.
* @throws CRLException thrown when encountering errors when parsing the CRL.
*/
public static CRL getCRL(X509Certificate certificate) throws CertificateException, CRLException, IOException {
return CertificateUtil.getCRL(CertificateUtil.getCRLURL(certificate));
}
/**
* Gets the URL of the Certificate Revocation List for a Certificate
* @param certificate the Certificate
* @return the String where you can check if the certificate was revoked
* @throws CertificateParsingException throws if invalid DER-encoded certificate is parsed or
* unsupported DER features are found in the certificate
*/
public static String getCRLURL(X509Certificate certificate) throws CertificateParsingException {
ASN1Primitive obj;
try {
obj = getExtensionValue(certificate, Extension.cRLDistributionPoints.getId());
} catch (IOException e) {
obj = (ASN1Primitive) null;
}
if (obj == null) {
return null;
}
CRLDistPoint dist = CRLDistPoint.getInstance(obj);
DistributionPoint[] dists = dist.getDistributionPoints();
for (DistributionPoint p : dists) {
DistributionPointName distributionPointName = p.getDistributionPoint();
if (DistributionPointName.FULL_NAME != distributionPointName.getType()) {
continue;
}
GeneralNames generalNames = (GeneralNames)distributionPointName.getName();
GeneralName[] names = generalNames.getNames();
for (GeneralName name : names) {
if (name.getTagNo() != GeneralName.uniformResourceIdentifier) {
continue;
}
DERIA5String derStr = DERIA5String.getInstance((ASN1TaggedObject)name.toASN1Primitive(), false);
return derStr.getString();
}
}
return null;
}
/**
* Gets the CRL object using a CRL URL.
*
* @param url the URL where the CRL is located
* @return CRL object
* @throws IOException thrown when the URL couldn't be opened properly.
* @throws CertificateException thrown if there's no X509 implementation in the provider.
* @throws CRLException thrown when encountering errors when parsing the CRL.
*/
public static CRL getCRL(String url) throws IOException, CertificateException, CRLException {
if (url == null)
return null;
return SignUtils.parseCrlFromStream(new URL(url).openStream());
}
// Online Certificate Status Protocol
/**
* Retrieves the OCSP URL from the given certificate.
* @param certificate the certificate
* @return the URL or null
*/
public static String getOCSPURL(X509Certificate certificate) {
ASN1Primitive obj;
try {
obj = getExtensionValue(certificate, Extension.authorityInfoAccess.getId());
if (obj == null) {
return null;
}
ASN1Sequence AccessDescriptions = (ASN1Sequence) obj;
for (int i = 0; i < AccessDescriptions.size(); i++) {
ASN1Sequence AccessDescription = (ASN1Sequence) AccessDescriptions.getObjectAt(i);
if ( AccessDescription.size() != 2 ) {
continue;
}
else if (AccessDescription.getObjectAt(0) instanceof ASN1ObjectIdentifier) {
ASN1ObjectIdentifier id = (ASN1ObjectIdentifier)AccessDescription.getObjectAt(0);
if (SecurityIDs.ID_OCSP.equals(id.getId())) {
ASN1Primitive description = (ASN1Primitive)AccessDescription.getObjectAt(1);
String AccessLocation = getStringFromGeneralName(description);
if (AccessLocation == null) {
return "" ;
}
else {
return AccessLocation ;
}
}
}
}
} catch (IOException e) {
return null;
}
return null;
}
// Time Stamp Authority
/**
* Gets the URL of the TSA if it's available on the certificate
* @param certificate a certificate
* @return a TSA URL
*/
public static String getTSAURL(X509Certificate certificate) {
byte[] der = SignUtils.getExtensionValueByOid(certificate, SecurityIDs.ID_TSA);
if(der == null)
return null;
ASN1Primitive asn1obj;
try {
asn1obj = ASN1Primitive.fromByteArray(der);
DEROctetString octets = (DEROctetString)asn1obj;
asn1obj = ASN1Primitive.fromByteArray(octets.getOctets());
ASN1Sequence asn1seq = ASN1Sequence.getInstance(asn1obj);
return getStringFromGeneralName(asn1seq.getObjectAt(1).toASN1Primitive());
} catch (IOException e) {
return null;
}
}
// helper methods
/**
* @param certificate the certificate from which we need the ExtensionValue
* @param oid the Object Identifier value for the extension.
* @return the extension value as an ASN1Primitive object
* @throws IOException
*/
private static ASN1Primitive getExtensionValue(X509Certificate certificate, String oid) throws IOException {
byte[] bytes = SignUtils.getExtensionValueByOid(certificate, oid);
if (bytes == null) {
return null;
}
ASN1InputStream aIn = new ASN1InputStream(new ByteArrayInputStream(bytes));
ASN1OctetString octs = (ASN1OctetString) aIn.readObject();
aIn = new ASN1InputStream(new ByteArrayInputStream(octs.getOctets()));
return aIn.readObject();
}
/**
* Gets a String from an ASN1Primitive
* @param names the ASN1Primitive
* @return a human-readable String
* @throws IOException
*/
private static String getStringFromGeneralName(ASN1Primitive names) throws IOException {
ASN1TaggedObject taggedObject = (ASN1TaggedObject) names ;
return new String(ASN1OctetString.getInstance(taggedObject, false).getOctets(), "ISO-8859-1");
}
}
