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//
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package com.signalfx.shaded.jetty.util.ssl;
import java.net.InetAddress;
import java.security.cert.X509Certificate;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import javax.naming.ldap.LdapName;
import javax.naming.ldap.Rdn;
import javax.security.auth.x500.X500Principal;
import com.signalfx.shaded.jetty.util.StringUtil;
import com.signalfx.shaded.jetty.util.log.Log;
import com.signalfx.shaded.jetty.util.log.Logger;
public class X509
{
private static final Logger LOG = Log.getLogger(X509.class);
/*
* @see {@link X509Certificate#getKeyUsage()}
*/
private static final int KEY_USAGE__KEY_CERT_SIGN = 5;
/*
* @see {@link X509Certificate#getSubjectAlternativeNames()}
*/
private static final int SUBJECT_ALTERNATIVE_NAMES__DNS_NAME = 2;
private static final int SUBJECT_ALTERNATIVE_NAMES__IP_ADDRESS = 7;
public static boolean isCertSign(X509Certificate x509)
{
boolean[] keyUsage = x509.getKeyUsage();
if ((keyUsage == null) || (keyUsage.length <= KEY_USAGE__KEY_CERT_SIGN))
{
return false;
}
return keyUsage[KEY_USAGE__KEY_CERT_SIGN];
}
private final X509Certificate _x509;
private final String _alias;
private final Set _hosts = new LinkedHashSet<>();
private final Set _wilds = new LinkedHashSet<>();
private final Set _addresses = new LinkedHashSet<>();
public X509(String alias, X509Certificate x509)
{
_alias = alias;
_x509 = x509;
try
{
// Look for alternative name extensions
Collection> altNames = x509.getSubjectAlternativeNames();
if (altNames != null)
{
for (List list : altNames)
{
int nameType = ((Number)list.get(0)).intValue();
switch (nameType)
{
case SUBJECT_ALTERNATIVE_NAMES__DNS_NAME:
{
String name = list.get(1).toString();
if (LOG.isDebugEnabled())
LOG.debug("Certificate alias={} SAN dns={} in {}", alias, name, this);
addName(name);
break;
}
case SUBJECT_ALTERNATIVE_NAMES__IP_ADDRESS:
{
String address = list.get(1).toString();
if (LOG.isDebugEnabled())
LOG.debug("Certificate alias={} SAN ip={} in {}", alias, address, this);
addAddress(address);
break;
}
default:
break;
}
}
}
// If no names found, look up the CN from the subject
LdapName name = new LdapName(x509.getSubjectX500Principal().getName(X500Principal.RFC2253));
for (Rdn rdn : name.getRdns())
{
if (rdn.getType().equalsIgnoreCase("CN"))
{
String cn = rdn.getValue().toString();
if (LOG.isDebugEnabled())
LOG.debug("Certificate CN alias={} CN={} in {}", alias, cn, this);
addName(cn);
}
}
}
catch (Exception x)
{
throw new IllegalArgumentException(x);
}
}
protected void addName(String cn)
{
if (cn != null)
{
cn = StringUtil.asciiToLowerCase(cn);
if (cn.startsWith("*."))
_wilds.add(cn.substring(2));
else
_hosts.add(cn);
}
}
private void addAddress(String host)
{
// Class InetAddress handles IPV6 brackets and IPv6 short forms, so that [::1]
// would match 0:0:0:0:0:0:0:1 as well as 0000:0000:0000:0000:0000:0000:0000:0001.
InetAddress address = toInetAddress(host);
if (address != null)
_addresses.add(address);
}
private InetAddress toInetAddress(String address)
{
try
{
return InetAddress.getByName(address);
}
catch (Throwable x)
{
LOG.ignore(x);
return null;
}
}
public String getAlias()
{
return _alias;
}
public X509Certificate getCertificate()
{
return _x509;
}
public Set getHosts()
{
return Collections.unmodifiableSet(_hosts);
}
public Set getWilds()
{
return Collections.unmodifiableSet(_wilds);
}
public boolean matches(String host)
{
host = StringUtil.asciiToLowerCase(host);
if (_hosts.contains(host) || _wilds.contains(host))
return true;
int dot = host.indexOf('.');
if (dot >= 0)
{
String domain = host.substring(dot + 1);
if (_wilds.contains(domain))
return true;
}
// Check if the host looks like an IP address to avoid
// DNS lookup for host names that did not match.
if (seemsIPAddress(host))
{
InetAddress address = toInetAddress(host);
if (address != null)
return _addresses.contains(address);
}
return false;
}
private static boolean seemsIPAddress(String host)
{
// IPv4 is just numbers and dots.
String ipv4RegExp = "[0-9\\.]+";
// IPv6 is hex and colons and possibly brackets.
String ipv6RegExp = "[0-9a-fA-F:\\[\\]]+";
return host.matches(ipv4RegExp) ||
(host.matches(ipv6RegExp) && containsAtLeastTwoColons(host));
}
private static boolean containsAtLeastTwoColons(String host)
{
int index = host.indexOf(':');
if (index >= 0)
index = host.indexOf(':', index + 1);
return index > 0;
}
@Override
public String toString()
{
return String.format("%s@%x(%s,h=%s,a=%s,w=%s)",
getClass().getSimpleName(),
hashCode(),
_alias,
_hosts,
_addresses,
_wilds);
}
}