/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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/*
* (C) Copyright IBM Corp. 1999 All Rights Reserved.
* Copyright 1997 The Open Group Research Institute. All rights reserved.
*/
package sun.security.krb5.internal.rcache;
import java.util.Hashtable;
import sun.security.krb5.internal.KerberosTime;
/**
* This class implements Hashtable to store the replay caches.
*
* @author Yanni Zhang
*/
public class CacheTable extends Hashtable<String,ReplayCache> {
private static final long serialVersionUID = -4695501354546664910L;
private boolean DEBUG = sun.security.krb5.internal.Krb5.DEBUG;
public CacheTable () {
}
/**
* Puts the client timestamp in replay cache.
* @params principal the client's principal name.
* @params time authenticator timestamp.
*/
public synchronized void put(String principal, AuthTime time, long currTime) {
ReplayCache rc = super.get(principal);
if (rc == null) {
if (DEBUG) {
System.out.println("replay cache for " + principal + " is null.");
}
rc = new ReplayCache(principal, this);
rc.put(time, currTime);
super.put(principal, rc);
}
else {
rc.put(time, currTime);
// re-insert the entry, since rc.put could have removed the entry
super.put(principal, rc);
if (DEBUG) {
System.out.println("replay cache found.");
}
}
}
/**
* This method tests if replay cache keeps a record of the authenticator's time stamp.
* If there is a record (replay attack detected), the server should reject the client request.
* @params principal the client's principal name.
* @params time authenticator timestamp.
* @return null if no record found, else return an <code>AuthTime</code> object.
*/
public Object get(AuthTime time, String principal) {
ReplayCache rc = super.get(principal);
if ((rc != null) && (rc.contains(time))) {
return time;
}
return null;
}
}