/*
* Copyright 2012 gitblit.com.
*
* 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 com.gitblit;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509CRL;
import java.security.cert.X509CRLEntry;
import java.security.cert.X509Certificate;
import java.text.MessageFormat;
import java.util.concurrent.atomic.AtomicLong;
import javax.net.ssl.X509TrustManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* GitblitTrustManager is a wrapper trust manager that hot-reloads a local file
* CRL and enforces client certificate revocations. The GitblitTrustManager
* also implements fuzzy revocation enforcement in case of issuer mismatch BUT
* serial number match. These rejecions are specially noted in the log.
*
* @author James Moger
*/
public class GitblitTrustManager implements X509TrustManager {
private static final Logger logger = LoggerFactory.getLogger(GitblitTrustManager.class);
private final X509TrustManager delegate;
private final File caRevocationList;
private final AtomicLong lastModified = new AtomicLong(0);
private volatile X509CRL crl;
public GitblitTrustManager(X509TrustManager delegate, File crlFile) {
this.delegate = delegate;
this.caRevocationList = crlFile;
}
@Override
public void checkClientTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
X509Certificate cert = chain[0];
if (isRevoked(cert)) {
String message = MessageFormat.format("Rejecting revoked certificate {0,number,0} for {1}",
cert.getSerialNumber(), cert.getSubjectDN().getName());
logger.warn(message);
throw new CertificateException(message);
}
delegate.checkClientTrusted(chain, authType);
}
@Override
public void checkServerTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
delegate.checkServerTrusted(chain, authType);
}
@Override
public X509Certificate[] getAcceptedIssuers() {
return delegate.getAcceptedIssuers();
}
protected boolean isRevoked(X509Certificate cert) {
if (!caRevocationList.exists()) {
return false;
}
read();
if (crl.isRevoked(cert)) {
// exact cert is revoked
return true;
}
X509CRLEntry entry = crl.getRevokedCertificate(cert.getSerialNumber());
if (entry != null) {
logger.warn("Certificate issuer does not match CRL issuer, but serial number has been revoked!");
logger.warn(" cert issuer = " + cert.getIssuerX500Principal());
logger.warn(" crl issuer = " + crl.getIssuerX500Principal());
return true;
}
return false;
}
protected synchronized void read() {
if (lastModified.get() == caRevocationList.lastModified()) {
return;
}
logger.info("Reloading CRL from " + caRevocationList.getAbsolutePath());
InputStream inStream = null;
try {
inStream = new FileInputStream(caRevocationList);
CertificateFactory cf = CertificateFactory.getInstance("X.509");
X509CRL list = (X509CRL)cf.generateCRL(inStream);
crl = list;
lastModified.set(caRevocationList.lastModified());
} catch (Exception e) {
} finally {
if (inStream != null) {
try {
inStream.close();
} catch (Exception e) {
}
}
}
}
}