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jeremybenn |
/* ServerStore.java --
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Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.javax.crypto.sasl.srp;
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import gnu.java.lang.CPStringBuilder;
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import java.util.HashMap;
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/**
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* The server-side implementation of the SRP security context store.
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*/
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public class ServerStore
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{
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/** The underlying singleton. */
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private static ServerStore singleton = null;
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/** The map of sid --> Security Context record. */
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private static final HashMap sid2ssc = new HashMap();
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/** The map of sid --> Session timing record. */
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private static final HashMap sid2ttl = new HashMap();
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/** A synchronisation lock. */
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private static final Object lock = new Object();
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/** A counter to generate legible SIDs. */
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private static int counter = 0;
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/** Private constructor to enforce Singleton pattern. */
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private ServerStore()
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{
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super();
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// TODO: add a cleaning timer thread
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}
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/**
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* Returns the classloader Singleton.
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*
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* @return the classloader Singleton instance.
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*/
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static synchronized final ServerStore instance()
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{
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if (singleton == null)
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singleton = new ServerStore();
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return singleton;
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}
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/**
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* Returns a legible new session identifier.
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*
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* @return a new session identifier.
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*/
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static synchronized final byte[] getNewSessionID()
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{
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final String sid = String.valueOf(++counter);
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return new CPStringBuilder("SID-")
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.append("0000000000".substring(0, 10 - sid.length())).append(sid)
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.toString().getBytes();
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}
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/**
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* Returns a boolean flag indicating if the designated session is still alive
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* or not.
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*
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* @param sid the identifier of the session to check.
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* @return <code>true</code> if the designated session is still alive.
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* <code>false</code> otherwise.
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*/
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boolean isAlive(final byte[] sid)
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{
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boolean result = false;
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if (sid != null && sid.length != 0)
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{
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synchronized (lock)
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{
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final String key = new String(sid);
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final StoreEntry ctx = (StoreEntry) sid2ttl.get(key);
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if (ctx != null)
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{
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result = ctx.isAlive();
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if (! result) // invalidate it en-passant
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{
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sid2ssc.remove(key);
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sid2ttl.remove(key);
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}
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}
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}
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}
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return result;
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}
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/**
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* Records a mapping between a session identifier and the Security Context of
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* the designated SRP server mechanism instance.
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*
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* @param ttl the session's Time-To-Live indicator (in seconds).
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* @param ctx the server's security context.
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*/
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void cacheSession(final int ttl, final SecurityContext ctx)
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{
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synchronized (lock)
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{
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final String key = new String(ctx.getSID());
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sid2ssc.put(key, ctx);
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sid2ttl.put(key, new StoreEntry(ttl));
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}
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}
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/**
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* Updates the mapping between the designated session identifier and the
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* designated server's SASL Security Context. In the process, computes and
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* return the underlying mechanism server's evidence that shall be returned to
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* the client in a session re-use exchange.
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*
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* @param sid the identifier of the session to restore.
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* @return an SRP server's security context.
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*/
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SecurityContext restoreSession(final byte[] sid)
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{
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final String key = new String(sid);
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final SecurityContext result;
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synchronized (lock)
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{
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result = (SecurityContext) sid2ssc.remove(key);
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sid2ttl.remove(key);
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}
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return result;
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}
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/**
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* Removes all information related to the designated session ID.
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*
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* @param sid the identifier of the seesion to invalidate.
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*/
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void invalidateSession(final byte[] sid)
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{
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final String key = new String(sid);
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synchronized (lock)
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{
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sid2ssc.remove(key);
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sid2ttl.remove(key);
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}
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}
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}
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