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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.qpid.transport.network.security.ssl;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.Principal;
import java.security.cert.Certificate;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;
import javax.naming.InvalidNameException;
import javax.naming.ldap.LdapName;
import javax.naming.ldap.Rdn;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLPeerUnverifiedException;
import org.apache.qpid.transport.TransportException;
import org.apache.qpid.transport.util.Logger;
public class SSLUtil
{
private static final Logger log = Logger.get(SSLUtil.class);
private static final Integer DNS_NAME_TYPE = 2;
private SSLUtil()
{
}
public static void verifyHostname(SSLEngine engine,String hostnameExpected)
{
try
{
Certificate cert = engine.getSession().getPeerCertificates()[0];
verifyHostname(hostnameExpected, (X509Certificate) cert);
}
catch(SSLPeerUnverifiedException e)
{
log.warn("Exception received while trying to verify hostname",e);
// For some reason the SSL engine sets the handshake status to FINISH twice
// in succession. The first time the peer certificate
// info is not available. The second time it works !
// Therefore have no choice but to ignore the exception here.
}
}
public static void verifyHostname(final String hostnameExpected, final X509Certificate cert)
{
Principal p = cert.getSubjectDN();
SortedSet<String> names = new TreeSet<>();
String dn = p.getName();
try
{
LdapName ldapName = new LdapName(dn);
for (Rdn part : ldapName.getRdns())
{
if (part.getType().equalsIgnoreCase("CN"))
{
names.add(part.getValue().toString());
break;
}
}
if(cert.getSubjectAlternativeNames() != null)
{
for (List<?> entry : cert.getSubjectAlternativeNames())
{
if (DNS_NAME_TYPE.equals(entry.get(0)))
{
names.add((String) entry.get(1));
}
}
}
if (names.isEmpty())
{
throw new TransportException("SSL hostname verification failed. Certificate for did not contain CN or DNS subjectAlt");
}
boolean match = false;
final String hostName = hostnameExpected.trim().toLowerCase();
for (String cn : names)
{
boolean doWildcard = cn.startsWith("*.") &&
cn.lastIndexOf('.') >= 3 &&
!cn.matches("\\*\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}");
match = doWildcard
? hostName.endsWith(cn.substring(1)) && hostName.indexOf(".") == (1 + hostName.length() - cn.length())
: hostName.equals(cn);
if (match)
{
break;
}
}
if (!match)
{
throw new TransportException("SSL hostname verification failed." +
" Expected : " + hostnameExpected +
" Found in cert : " + names);
}
}
catch (InvalidNameException e)
{
throw new TransportException("SSL hostname verification failed. Could not parse name " + dn, e);
}
catch (CertificateParsingException e)
{
throw new TransportException("SSL hostname verification failed. Could not parse certificate: " + e.getMessage(), e);
}
}
public static String getIdFromSubjectDN(String dn)
{
String cnStr = null;
String dcStr = null;
if(dn == null)
{
return "";
}
else
{
try
{
LdapName ln = new LdapName(dn);
for(Rdn rdn : ln.getRdns())
{
if("CN".equalsIgnoreCase(rdn.getType()))
{
cnStr = rdn.getValue().toString();
}
else if("DC".equalsIgnoreCase(rdn.getType()))
{
if(dcStr == null)
{
dcStr = rdn.getValue().toString();
}
else
{
dcStr = rdn.getValue().toString() + '.' + dcStr;
}
}
}
return cnStr == null || cnStr.length()==0 ? "" : dcStr == null ? cnStr : cnStr + '@' + dcStr;
}
catch (InvalidNameException e)
{
log.warn("Invalid name: '"+dn+"'. ");
return "";
}
}
}
public static String retrieveIdentity(SSLEngine engine)
{
String id = "";
Certificate cert = engine.getSession().getLocalCertificates()[0];
Principal p = ((X509Certificate)cert).getSubjectDN();
String dn = p.getName();
try
{
id = SSLUtil.getIdFromSubjectDN(dn);
}
catch (Exception e)
{
log.info("Exception received while trying to retrieve client identity from SSL cert", e);
}
log.debug("Extracted Identity from client certificate : " + id);
return id;
}
public static KeyStore getInitializedKeyStore(String storePath, String storePassword, String keyStoreType) throws GeneralSecurityException, IOException
{
KeyStore ks = KeyStore.getInstance(keyStoreType);
InputStream in = null;
try
{
File f = new File(storePath);
if (f.exists())
{
in = new FileInputStream(f);
}
else
{
in = Thread.currentThread().getContextClassLoader().getResourceAsStream(storePath);
}
if (in == null && !"PKCS11".equalsIgnoreCase(keyStoreType)) // PKCS11 will not require an explicit path
{
throw new IOException("Unable to load keystore resource: " + storePath);
}
char[] storeCharPassword = storePassword == null ? null : storePassword.toCharArray();
ks.load(in, storeCharPassword);
}
finally
{
if (in != null)
{
//noinspection EmptyCatchBlock
try
{
in.close();
}
catch (IOException ignored)
{
}
}
}
return ks;
}
}
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