/*
* oxAuth is available under the MIT License (2008). See http://opensource.org/licenses/MIT for full text.
*
* Copyright (c) 2014, Gluu
*/
package org.xdi.oxauth.cert.validation;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.Principal;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;
import java.util.Date;
import java.util.List;
import org.apache.commons.io.IOUtils;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERIA5String;
import org.bouncycastle.asn1.x509.AccessDescription;
import org.bouncycastle.asn1.x509.AuthorityInformationAccess;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.X509ObjectIdentifiers;
import org.bouncycastle.cert.jcajce.JcaX509CertificateHolder;
import org.bouncycastle.cert.ocsp.BasicOCSPResp;
import org.bouncycastle.cert.ocsp.CertificateID;
import org.bouncycastle.cert.ocsp.CertificateStatus;
import org.bouncycastle.cert.ocsp.OCSPException;
import org.bouncycastle.cert.ocsp.OCSPReq;
import org.bouncycastle.cert.ocsp.OCSPReqBuilder;
import org.bouncycastle.cert.ocsp.OCSPResp;
import org.bouncycastle.cert.ocsp.OCSPRespBuilder;
import org.bouncycastle.cert.ocsp.RevokedStatus;
import org.bouncycastle.cert.ocsp.SingleResp;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xdi.oxauth.cert.validation.model.ValidationStatus;
import org.xdi.oxauth.cert.validation.model.ValidationStatus.CertificateValidity;
import org.xdi.oxauth.cert.validation.model.ValidationStatus.ValidatorSourceType;
import org.xdi.oxauth.model.util.SecurityProviderUtility;
/**
* Certificate verifier based on OCSP
*
* @author Yuriy Movchan
* @version March 10, 2016
*/
public class OCSPCertificateVerifier implements CertificateVerifier {
private static final Logger log = LoggerFactory.getLogger(OCSPCertificateVerifier.class);
public OCSPCertificateVerifier() {
SecurityProviderUtility.installBCProvider(true);
}
@Override
public ValidationStatus validate(X509Certificate certificate, List<X509Certificate> issuers, Date validationDate) {
X509Certificate issuer = issuers.get(0);
ValidationStatus status = new ValidationStatus(certificate, issuer, validationDate, ValidatorSourceType.OCSP, CertificateValidity.UNKNOWN);
try {
Principal subjectX500Principal = certificate.getSubjectX500Principal();
String ocspUrl = getOCSPUrl(certificate);
if (ocspUrl == null) {
log.error("OCSP URL for '" + subjectX500Principal + "' is empty");
return status;
}
log.debug("OCSP URL for '" + subjectX500Principal + "' is '" + ocspUrl + "'");
DigestCalculator digestCalculator = new JcaDigestCalculatorProviderBuilder().build().get(CertificateID.HASH_SHA1);
CertificateID certificateId = new CertificateID(digestCalculator, new JcaX509CertificateHolder(certificate), certificate.getSerialNumber());
// Generate OCSP request
OCSPReq ocspReq = generateOCSPRequest(certificateId);
// Get OCSP response from server
OCSPResp ocspResp = requestOCSPResponse(ocspUrl, ocspReq);
if (ocspResp.getStatus() != OCSPRespBuilder.SUCCESSFUL) {
log.error("OCSP response is invalid!");
status.setValidity(CertificateValidity.INVALID);
return status;
}
boolean foundResponse = false;
BasicOCSPResp basicOCSPResp = (BasicOCSPResp) ocspResp.getResponseObject();
SingleResp[] singleResps = basicOCSPResp.getResponses();
for (SingleResp singleResp : singleResps) {
CertificateID responseCertificateId = singleResp.getCertID();
if (!certificateId.equals(responseCertificateId)) {
continue;
}
foundResponse = true;
log.debug("OCSP validationDate: " + validationDate);
log.debug("OCSP thisUpdate: " + singleResp.getThisUpdate());
log.debug("OCSP nextUpdate: " + singleResp.getNextUpdate());
status.setRevocationObjectIssuingTime(basicOCSPResp.getProducedAt());
Object certStatus = singleResp.getCertStatus();
if (certStatus == CertificateStatus.GOOD) {
log.debug("OCSP status is valid for '" + certificate.getSubjectX500Principal() + "'");
status.setValidity(CertificateValidity.VALID);
} else {
if (singleResp.getCertStatus() instanceof RevokedStatus) {
log.warn("OCSP status is revoked for: " + subjectX500Principal);
if (validationDate.before(((RevokedStatus) singleResp.getCertStatus()).getRevocationTime())) {
log.warn("OCSP revocation time after the validation date, the certificate '" + subjectX500Principal + "' was valid at " + validationDate);
status.setValidity(CertificateValidity.VALID);
} else {
Date revocationDate = ((RevokedStatus) singleResp.getCertStatus()).getRevocationTime();
log.info("OCSP for certificate '" + subjectX500Principal + "' is revoked since " + revocationDate);
status.setRevocationDate(revocationDate);
status.setRevocationObjectIssuingTime(singleResp.getThisUpdate());
status.setValidity(CertificateValidity.REVOKED);
}
}
}
}
if (!foundResponse) {
log.error("There is no matching OCSP response entries");
}
} catch (Exception ex) {
log.error("OCSP exception: ", ex);
}
return status;
}
private OCSPReq generateOCSPRequest(CertificateID certificateId) throws OCSPException, OperatorCreationException, CertificateEncodingException {
OCSPReqBuilder ocspReqGenerator = new OCSPReqBuilder();
ocspReqGenerator.addRequest(certificateId);
OCSPReq ocspReq = ocspReqGenerator.build();
return ocspReq;
}
@SuppressWarnings({ "deprecation", "resource" })
private String getOCSPUrl(X509Certificate certificate) throws IOException {
ASN1Primitive obj;
try {
obj = getExtensionValue(certificate, Extension.authorityInfoAccess.getId());
} catch (IOException ex) {
log.error("Failed to get OCSP URL", ex);
return null;
}
if (obj == null) {
return null;
}
AuthorityInformationAccess authorityInformationAccess = AuthorityInformationAccess.getInstance(obj);
AccessDescription[] accessDescriptions = authorityInformationAccess.getAccessDescriptions();
for (AccessDescription accessDescription : accessDescriptions) {
boolean correctAccessMethod = accessDescription.getAccessMethod().equals(X509ObjectIdentifiers.ocspAccessMethod);
if (!correctAccessMethod) {
continue;
}
GeneralName name = accessDescription.getAccessLocation();
if (name.getTagNo() != GeneralName.uniformResourceIdentifier) {
continue;
}
DERIA5String derStr = DERIA5String.getInstance((ASN1TaggedObject) name.toASN1Primitive(), false);
return derStr.getString();
}
return null;
}
public OCSPResp requestOCSPResponse(String url, OCSPReq ocspReq) throws IOException, MalformedURLException {
byte[] ocspReqData = ocspReq.getEncoded();
HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
try {
con.setRequestProperty("Content-Type", "application/ocsp-request");
con.setRequestProperty("Accept", "application/ocsp-response");
con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false);
OutputStream out = con.getOutputStream();
try {
IOUtils.write(ocspReqData, out);
out.flush();
} finally {
IOUtils.closeQuietly(out);
}
byte[] responseBytes = IOUtils.toByteArray(con.getInputStream());
OCSPResp ocspResp = new OCSPResp(responseBytes);
return ocspResp;
} finally {
if (con != null) {
con.disconnect();
}
}
}
/**
* @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 = certificate.getExtensionValue(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();
}
@Override
public void destroy() {
}
}