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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2024 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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 .
*/
package com.itextpdf.signatures;
import com.itextpdf.bouncycastleconnector.BouncyCastleFactoryCreator;
import com.itextpdf.commons.bouncycastle.IBouncyCastleFactory;
import com.itextpdf.commons.bouncycastle.cert.ocsp.IOCSPResp;
import com.itextpdf.commons.bouncycastle.cert.ocsp.AbstractOCSPException;
import com.itextpdf.commons.bouncycastle.cert.ocsp.IBasicOCSPResp;
import com.itextpdf.commons.bouncycastle.cert.ocsp.ICertificateID;
import com.itextpdf.commons.bouncycastle.cert.ocsp.ICertificateStatus;
import com.itextpdf.commons.bouncycastle.cert.ocsp.IOCSPReq;
import com.itextpdf.commons.bouncycastle.cert.ocsp.ISingleResp;
import com.itextpdf.commons.bouncycastle.operator.AbstractOperatorCreationException;
import com.itextpdf.commons.utils.DateTimeUtil;
import com.itextpdf.io.logs.IoLogMessageConstant;
import com.itextpdf.io.util.StreamUtil;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.net.URL;
import java.security.GeneralSecurityException;
import java.security.Security;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* OcspClient implementation using BouncyCastle.
*/
public class OcspClientBouncyCastle implements IOcspClient {
private static final IBouncyCastleFactory BOUNCY_CASTLE_FACTORY = BouncyCastleFactoryCreator.getFactory();
/**
* The Logger instance.
*/
private static final Logger LOGGER = LoggerFactory.getLogger(OcspClientBouncyCastle.class);
private final OCSPVerifier verifier;
/**
* Creates {@code OcspClient}.
*
* @param verifier will be used for response verification.
*
* @see OCSPVerifier
*/
public OcspClientBouncyCastle(OCSPVerifier verifier) {
this.verifier = verifier;
}
/**
* Gets OCSP response. If {@link OCSPVerifier} was set, the response will be checked.
*
* @param checkCert the certificate to check
* @param rootCert parent certificate
* @param url to get the verification
*
* @return {@link IBasicOCSPResp} an OCSP response wrapper
*/
public IBasicOCSPResp getBasicOCSPResp(X509Certificate checkCert, X509Certificate rootCert, String url) {
try {
IOCSPResp ocspResponse = getOcspResponse(checkCert, rootCert, url);
if (ocspResponse == null) {
return null;
}
if (ocspResponse.getStatus() != BOUNCY_CASTLE_FACTORY.createOCSPResponseStatus().getSuccessful()) {
return null;
}
IBasicOCSPResp basicResponse = BOUNCY_CASTLE_FACTORY.createBasicOCSPResp(ocspResponse.getResponseObject());
if (verifier != null) {
verifier.isValidResponse(basicResponse, rootCert, DateTimeUtil.getCurrentTimeDate());
}
return basicResponse;
} catch (Exception ex) {
LOGGER.error(ex.getMessage());
}
return null;
}
/**
* {@inheritDoc}
*/
@Override
public byte[] getEncoded(X509Certificate checkCert, X509Certificate rootCert, String url) {
try {
IBasicOCSPResp basicResponse = getBasicOCSPResp(checkCert, rootCert, url);
if (basicResponse != null) {
ISingleResp[] responses = basicResponse.getResponses();
if (responses.length == 1) {
ISingleResp resp = responses[0];
ICertificateStatus status = resp.getCertStatus();
if (!BOUNCY_CASTLE_FACTORY.createCertificateStatus().getGood().equals(status)) {
if (BOUNCY_CASTLE_FACTORY.createRevokedStatus(status) == null) {
LOGGER.info(IoLogMessageConstant.OCSP_STATUS_IS_UNKNOWN);
} else {
LOGGER.info(IoLogMessageConstant.OCSP_STATUS_IS_REVOKED);
}
}
return basicResponse.getEncoded();
}
}
} catch (Exception ex) {
LOGGER.error(ex.getMessage());
}
return null;
}
/**
* Generates an OCSP request using BouncyCastle.
*
* @param issuerCert certificate of the issues
* @param serialNumber serial number
*
* @return {@link IOCSPReq} an OCSP request wrapper
*
* @throws AbstractOCSPException is thrown if any errors occur while handling OCSP requests/responses
* @throws IOException signals that an I/O exception has occurred
* @throws CertificateEncodingException is thrown if any errors occur while handling OCSP requests/responses
* @throws AbstractOperatorCreationException is thrown if any errors occur while handling OCSP requests/responses
*/
protected static IOCSPReq generateOCSPRequest(X509Certificate issuerCert, BigInteger serialNumber)
throws AbstractOCSPException, IOException, CertificateEncodingException, AbstractOperatorCreationException {
//Add provider BC
Security.addProvider(BOUNCY_CASTLE_FACTORY.getProvider());
// Generate the id for the certificate we are looking for
ICertificateID id = SignUtils.generateCertificateId(issuerCert, serialNumber,
BOUNCY_CASTLE_FACTORY.createCertificateID().getHashSha1());
// basic request generation with nonce
return SignUtils.generateOcspRequestWithNonce(id);
}
/**
* Retrieves certificate status from the OCSP response.
*
* @param basicOcspRespBytes encoded basic OCSP response
*
* @return good, revoked or unknown certificate status retrieved from the OCSP response, or null if an error occurs.
*/
protected static ICertificateStatus getCertificateStatus(byte[] basicOcspRespBytes) {
try {
IBasicOCSPResp basicResponse = BOUNCY_CASTLE_FACTORY.createBasicOCSPResp(
BOUNCY_CASTLE_FACTORY.createBasicOCSPResponse(BOUNCY_CASTLE_FACTORY.createASN1Primitive(
basicOcspRespBytes)));
if (basicResponse != null) {
ISingleResp[] responses = basicResponse.getResponses();
if (responses.length >= 1) {
return responses[0].getCertStatus();
}
}
} catch (Exception ignored) {
// Ignore exception.
}
return null;
}
/**
* Gets an OCSP response object using BouncyCastle.
*
* @param checkCert to certificate to check
* @param rootCert the parent certificate
* @param url to get the verification. If it's null it will be taken
* from the check cert or from other implementation specific source
*
* @return {@link IOCSPResp} an OCSP response wrapper
*
* @throws GeneralSecurityException if any execution errors occur
* @throws AbstractOCSPException if any errors occur while handling OCSP requests/responses
* @throws IOException if any I/O execution errors occur
* @throws AbstractOperatorCreationException if any BC execution errors occur
*/
IOCSPResp getOcspResponse(X509Certificate checkCert, X509Certificate rootCert, String url)
throws GeneralSecurityException, AbstractOCSPException, IOException, AbstractOperatorCreationException {
if (checkCert == null || rootCert == null) {
return null;
}
if (url == null) {
url = CertificateUtil.getOCSPURL(checkCert);
}
if (url == null) {
return null;
}
InputStream in = createRequestAndResponse(checkCert, rootCert, url);
return in == null ? null : BOUNCY_CASTLE_FACTORY.createOCSPResp(StreamUtil.inputStreamToArray(in));
}
/**
* Create OCSP request and get the response for this request, represented as {@link InputStream}.
*
* @param checkCert {@link X509Certificate} certificate to get OCSP response for
* @param rootCert {@link X509Certificate} root certificate from which OCSP request will be built
* @param url {@link URL} link, which is expected to be used to get OCSP response from
*
* @return OCSP response bytes, represented as {@link InputStream}
*
* @throws IOException if an I/O error occurs
* @throws AbstractOperatorCreationException is thrown if any errors occur while handling OCSP requests/responses
* @throws AbstractOCSPException is thrown if any errors occur while handling OCSP requests/responses
* @throws CertificateEncodingException is thrown if any errors occur while handling OCSP requests/responses
*/
protected InputStream createRequestAndResponse(X509Certificate checkCert, X509Certificate rootCert, String url)
throws IOException, AbstractOperatorCreationException, AbstractOCSPException, CertificateEncodingException {
LOGGER.info("Getting OCSP from " + url);
IOCSPReq request = generateOCSPRequest(rootCert, checkCert.getSerialNumber());
byte[] array = request.getEncoded();
URL urlt = new URL(url);
return SignUtils.getHttpResponseForOcspRequest(array, urlt);
}
}
