/*
* Copyright (C) 2004-2008 Jive Software. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.openfire.net;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigInteger;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.cert.CertPath;
import java.security.cert.CertPathValidatorException;
import java.security.cert.CertStore;
import java.security.cert.Certificate;
import java.security.cert.PKIXCertPathChecker;
import java.security.cert.PKIXParameters;
import java.security.cert.TrustAnchor;
import java.security.cert.X509CertSelector;
import java.security.cert.X509Certificate;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import javax.security.auth.x500.X500Principal;
import org.bouncycastle.cert.ocsp.BasicOCSPResp;
import org.bouncycastle.cert.ocsp.CertificateID;
import org.bouncycastle.cert.ocsp.CertificateStatus;
import org.bouncycastle.cert.ocsp.OCSPReq;
import org.bouncycastle.cert.ocsp.OCSPReqBuilder;
import org.bouncycastle.cert.ocsp.OCSPResp;
import org.bouncycastle.cert.ocsp.SingleResp;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
import org.bouncycastle.operator.jcajce.JcaContentVerifierProviderBuilder;
import org.jivesoftware.util.JiveGlobals;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A <code>PKIXCertPathChecker</code> that uses
* Online Certificate Status Protocol (OCSP)
*
* See <a href="http://www.ietf.org/rfc/rfc2560.txt">RFC 2560</a>.
*
* @author Jay Kline
*/
public class OCSPChecker extends PKIXCertPathChecker {
private static final Logger Log = LoggerFactory.getLogger(OCSPChecker.class);
private static String ocspServerUrl = JiveGlobals.getProperty("ocsp.responderURL");
private static String ocspServerSubject = JiveGlobals.getProperty("ocsp.responderCertSubjectName");
private static final boolean dump = true;
private int certIndex;
private X509Certificate[] certs;
private CertPath cp;
private PKIXParameters pkixParams;
OCSPChecker(CertPath certPath, PKIXParameters pkixParams)
throws CertPathValidatorException {
this.cp = certPath;
this.pkixParams = pkixParams;
List<? extends Certificate> tmp = cp.getCertificates();
certs =
(X509Certificate[]) tmp.toArray(new X509Certificate[tmp.size()]);
init(false);
}
@Override
public void init(boolean forward) throws CertPathValidatorException {
if (!forward) {
certIndex = certs.length - 1;
} else {
throw new CertPathValidatorException(
"Forward checking not supported");
}
}
@Override
public boolean isForwardCheckingSupported() {
return false;
}
@Override
public Set<String> getSupportedExtensions() {
return Collections.<String>emptySet();
}
@Override
public void check(Certificate cert, Collection<String> unresolvedCritExts)
throws CertPathValidatorException {
Log.debug("OCSPChecker: check called");
InputStream in = null;
OutputStream out = null;
try {
// Examine OCSP properties
X509Certificate responderCert = null;
boolean haveResponderCert = true; //defaults to issuers cert
X500Principal responderSubjectName = null;
boolean haveIssuerCert = false;
// If we set the subject name, we need to find the certificate
if (ocspServerSubject != null) {
haveResponderCert = false;
responderSubjectName = new X500Principal(ocspServerSubject);
}
X509Certificate issuerCert = null;
X509Certificate currCert = (X509Certificate) cert;
// Set the issuer certificate if we were passed a chain
if (certIndex != 0) {
issuerCert = certs[certIndex];
haveIssuerCert = true;
if (haveResponderCert) {
responderCert = certs[certIndex];
}
}
if (!haveIssuerCert || !haveResponderCert) {
if (!haveResponderCert) {
Log.debug("OCSPChecker: Looking for responder's certificate");
}
if (!haveIssuerCert) {
Log.debug("OCSPChecker: Looking for issuer's certificate");
}
// Extract the anchor certs
Iterator anchors = pkixParams.getTrustAnchors().iterator();
if (!anchors.hasNext()) {
throw new CertPathValidatorException(
"Must specify at least one trust anchor");
}
X500Principal certIssuerName =
currCert.getIssuerX500Principal();
while (anchors.hasNext() &&
(!haveIssuerCert || !haveResponderCert)) {
TrustAnchor anchor = (TrustAnchor) anchors.next();
X509Certificate anchorCert = anchor.getTrustedCert();
X500Principal anchorSubjectName =
anchorCert.getSubjectX500Principal();
// Check if this anchor cert is the issuer cert
if (!haveIssuerCert && certIssuerName.equals(anchorSubjectName)) {
issuerCert = anchorCert;
haveIssuerCert = true;
//If we have not set the responderCert at this point, set it to the issuer
if (haveResponderCert && responderCert == null) {
responderCert = anchorCert;
Log.debug("OCSPChecker: Responder's certificate = issuer certificate");
}
}
// Check if this anchor cert is the responder cert
if (!haveResponderCert) {
if (responderSubjectName != null &&
responderSubjectName.equals(anchorSubjectName)) {
responderCert = anchorCert;
haveResponderCert = true;
}
}
}
if (issuerCert == null) {
//No trust anchor was found matching the issuer
throw new CertPathValidatorException("No trusted certificate for " + currCert.getIssuerDN());
}
// Check cert stores if responder cert has not yet been found
if (!haveResponderCert) {
Log.debug("OCSPChecker: Searching cert stores for responder's certificate");
if (responderSubjectName != null) {
X509CertSelector filter = new X509CertSelector();
filter.setSubject(responderSubjectName.getName());
List<CertStore> certStores = pkixParams.getCertStores();
for (CertStore certStore : certStores) {
Iterator i = certStore.getCertificates(filter).iterator();
if (i.hasNext()) {
responderCert = (X509Certificate) i.next();
haveResponderCert = true;
break;
}
}
}
}
}
// Could not find the responder cert
if (!haveResponderCert) {
throw new CertPathValidatorException("Cannot find the responder's certificate.");
}
// Construct an OCSP Request
OCSPReqBuilder gen = new OCSPReqBuilder();
CertificateID certID = new CertificateID(new JcaDigestCalculatorProviderBuilder().setProvider("BC").build().get(CertificateID.HASH_SHA1), new X509CertificateHolder(issuerCert.getEncoded()), currCert.getSerialNumber());
gen.addRequest(certID);
OCSPReq ocspRequest = gen.build();
URL url;
if (ocspServerUrl != null) {
try {
url = new URL(ocspServerUrl);
} catch (MalformedURLException e) {
throw new CertPathValidatorException(e);
}
} else {
throw new CertPathValidatorException("Must set OCSP Server URL");
}
HttpURLConnection con = (HttpURLConnection) url.openConnection();
Log.debug("OCSPChecker: connecting to OCSP service at: " + url);
con.setDoOutput(true);
con.setDoInput(true);
con.setRequestMethod("POST");
con.setRequestProperty("Content-type", "application/ocsp-request");
con.setRequestProperty("Accept","application/ocsp-response");
byte[] bytes = ocspRequest.getEncoded();
con.setRequestProperty("Content-length", String.valueOf(bytes.length));
out = con.getOutputStream();
out.write(bytes);
out.flush();
// Check the response
if (con.getResponseCode() != HttpURLConnection.HTTP_OK) {
Log.debug("OCSPChecker: Received HTTP error: " + con.getResponseCode() +
" - " + con.getResponseMessage());
}
in = con.getInputStream();
OCSPResp ocspResponse = new OCSPResp(in);
BigInteger serialNumber = currCert.getSerialNumber();
BasicOCSPResp brep = (BasicOCSPResp) ocspResponse.getResponseObject();
try {
if( ! brep.isSignatureValid(new JcaContentVerifierProviderBuilder().setProvider("BC").build(responderCert.getPublicKey()))) {
throw new CertPathValidatorException("OCSP response is not verified");
}
} catch (Exception e) {
throw new CertPathValidatorException("OCSP response could not be verified ("+e.getMessage()+")" ,null, cp, certIndex);
}
SingleResp[] singleResp = brep.getResponses();
boolean foundResponse = false;
for (SingleResp resp : singleResp) {
CertificateID respCertID = resp.getCertID();
if (respCertID.equals(certID)) {
Object status = resp.getCertStatus();
if (status == CertificateStatus.GOOD) {
Log.debug("OCSPChecker: Status of certificate (with serial number " +
serialNumber.toString() + ") is: good");
foundResponse = true;
break;
} else if (status instanceof org.bouncycastle.cert.ocsp.RevokedStatus) {
Log.debug("OCSPChecker: Status of certificate (with serial number " +
serialNumber.toString() + ") is: revoked");
throw new CertPathValidatorException("Certificate has been revoked", null, cp, certIndex);
} else if (status instanceof org.bouncycastle.cert.ocsp.UnknownStatus) {
Log.debug("OCSPChecker: Status of certificate (with serial number " +
serialNumber.toString() + ") is: unknown");
throw new CertPathValidatorException("Certificate's revocation status is unknown", null, cp, certIndex);
} else {
Log.debug("Status of certificate (with serial number " +
serialNumber.toString() + ") is: not recognized");
throw new CertPathValidatorException("Unknown OCSP response for certificate", null, cp, certIndex);
}
}
}
// Check that response applies to the cert that was supplied
if (!foundResponse) {
throw new CertPathValidatorException(
"No certificates in the OCSP response match the " +
"certificate supplied in the OCSP request.");
}
} catch (CertPathValidatorException cpve) {
throw cpve;
} catch (Exception e) {
throw new CertPathValidatorException(e);
} finally {
if (in != null) {
try {
in.close();
} catch (IOException ioe) {
throw new CertPathValidatorException(ioe);
}
}
if (out != null) {
try {
out.close();
} catch (IOException ioe) {
throw new CertPathValidatorException(ioe);
}
}
}
}
}