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ksslcsessioncache.cpp

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00001 /* This file is part of the KDE project
00002  *
00003  * Copyright (C) 2003 Stefan Rompf <sux@loplof.de>
00004  *
00005  * This library is free software; you can redistribute it and/or
00006  * modify it under the terms of the GNU Library General Public
00007  * License as published by the Free Software Foundation; either
00008  * version 2 of the License, or (at your option) any later version.
00009  *
00010  * This library is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013  * Library General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU Library General Public License
00016  * along with this library; see the file COPYING.LIB.  If not, write to
00017  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00018  * Boston, MA 02110-1301, USA.
00019  */
00020 
00021 #include "ksslcsessioncache.h"
00022 
00023 #include <QtCore/QCoreApplication>
00024 #include <QtCore/QPair>
00025 #include <QtCore/QString>
00026 
00027 #include <kdebug.h>
00028 #include <kurl.h>
00029 
00030 #include <ksslconfig.h>
00031 
00032 /*
00033  * Operation:
00034  *
00035  * Sessions will be stored per running application, not KDE
00036  * wide, to avoid security problems with hostile programs
00037  * that negotiate sessions with weak cryptographic keys and store
00038  * them for everybody to use - I really don't want that.
00039  *
00040  * Retrieval is organized similar to George's thoughts in the KSSLD
00041  * certificate cache: The cache is organised as a list, with the
00042  * recently fetched (or stored) session first.
00043  *
00044  * The cache has an artificial limit of 32 sessions (should really
00045  * be enough), and relies on the peer server for timeouts
00046  *
00047  */
00048 #define MAX_ENTRIES 32
00049 
00050 #ifdef KSSL_HAVE_SSL
00051 
00052 typedef QPair<QString,QString> KSSLCSession;
00053 typedef QList<KSSLCSession> KSSLCSessions;
00054 
00055 static KSSLCSessions *sessions = 0L;
00056 
00057 static QString URLtoKey(const KUrl &kurl) {
00058     return kurl.host() + ':' + kurl.protocol() + ':' + QString::number(kurl.port());
00059 }
00060 
00061 
00062 static void cleanupKSSLCSessions() {
00063     delete sessions;
00064     sessions = 0;
00065 }
00066 
00067 static void setup() {
00068     sessions = new KSSLCSessions;
00069     qAddPostRoutine(cleanupKSSLCSessions);
00070 }
00071 
00072 #endif
00073 
00074 QString KSSLCSessionCache::getSessionForUrl(const KUrl &kurl) {
00075 #ifdef KSSL_HAVE_SSL
00076     if (!sessions) return QString();
00077     QString key = URLtoKey(kurl);
00078 
00079     for (int i = 0; i < sessions->size(); ++i) {
00080     if (sessions->at(i).first == key) {
00081             QString snd = sessions->at(i).second;
00082             sessions->prepend(sessions->takeAt(i));
00083         return snd;
00084     }
00085     }
00086 
00087     // Negative caching disabled: cache pollution
00088 #if 0
00089     kDebug(7029) <<"Negative caching " <<key;
00090     if (sessions->count() >= MAX_ENTRIES) sessions->removeLast();
00091     sessions->prepend(new KSSLCSession(key, QString()));
00092 #endif
00093 
00094 #endif
00095     return QString();
00096 }
00097 
00098 
00099 void KSSLCSessionCache::putSessionForUrl(const KUrl &kurl, const QString &session) {
00100 #ifdef KSSL_HAVE_SSL
00101     if (!sessions) setup();
00102     QString key = URLtoKey(kurl);
00103     KSSLCSessions::iterator it = sessions->begin();
00104 
00105     while ( it != sessions->end() ) {
00106         if ( it->first == key )
00107             break;
00108         ++it;
00109     }
00110 
00111     if (it != sessions->end()) {
00112     it->second = session;
00113     } else {
00114         if (sessions->size() >= MAX_ENTRIES)
00115             sessions->removeLast();
00116         sessions->prepend(KSSLCSession(key, session));
00117     }
00118 
00119 #endif
00120 }

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