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tdenetwork/kopete/protocols/groupwise/libgroupwise/securestream.cpp

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/*
securestream.h - Kopete Groupwise Protocol
Combines a ByteStream with TLS and SASL
Copyright (c) 2004 SUSE Linux AG http://www.suse.com
Based on Iris, Copyright (C) 2003 Justin Karneges
Kopete (c) 2002-2004 by the Kopete developers <kopete-devel@kde.org>
*************************************************************************
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Lesser General Public *
* License as published by the Free Software Foundation; either *
* version 2 of the License, or (at your option) any later version. *
* *
*************************************************************************
*/
/*
Note: SecureStream depends on the underlying security layers to signal
plain-to-encrypted results immediately (as opposed to waiting for the
event loop) so that the user cannot add/remove security layers during
this conversion moment. QCA::TLS and QCA::SASL behave as expected,
but future layers might not.
*/
#include<qguardedptr.h>
#include<qvaluelist.h>
#include<qtimer.h>
#include"securestream.h"
//----------------------------------------------------------------------------
// LayerTracker
//----------------------------------------------------------------------------
LayerTracker::LayerTracker()
{
p = 0;
}
void LayerTracker::reset()
{USE_TLSHANDLER
p = 0;
list.clear();
}
void LayerTracker::addPlain(int plain)
{
p += plain;
}
void LayerTracker::specifyEncoded(int encoded, int plain)
{
// can't specify more bytes than we have
if(plain > p)
plain = p;
p -= plain;
Item i;
i.plain = plain;
i.encoded = encoded;
list += i;
}
int LayerTracker::finished(int encoded)
{
int plain = 0;
for(QValueList<Item>::Iterator it = list.begin(); it != list.end();) {
Item &i = *it;
// not enough?
if(encoded < i.encoded) {
i.encoded -= encoded;
break;
}
encoded -= i.encoded;
plain += i.plain;
it = list.remove(it);
}
return plain;
}
//----------------------------------------------------------------------------
// SecureStream
//----------------------------------------------------------------------------
SecureLayer::SecureLayer(QCA::TLS *t)
{
type = TLS;
p.tls = t;
init();
connect(p.tls, SIGNAL(handshaken()), SLOT(tls_handshaken()));
connect(p.tls, SIGNAL(readyRead()), SLOT(tls_readyRead()));
connect(p.tls, SIGNAL(readyReadOutgoing(int)), SLOT(tls_readyReadOutgoing(int)));
connect(p.tls, SIGNAL(closed()), SLOT(tls_closed()));
connect(p.tls, SIGNAL(error(int)), SLOT(tls_error(int)));
}
SecureLayer::SecureLayer(QCA::SASL *s)
{
type = SASL;
p.sasl = s;
init();
connect(p.sasl, SIGNAL(readyRead()), SLOT(sasl_readyRead()));
connect(p.sasl, SIGNAL(readyReadOutgoing(int)), SLOT(sasl_readyReadOutgoing(int)));
connect(p.sasl, SIGNAL(error(int)), SLOT(sasl_error(int)));
}
#ifdef USE_TLSHANDLER
SecureLayer::SecureLayer(TLSHandler *t)
{
type = TLSH;
p.tlsHandler = t;
init();
connect(p.tlsHandler, SIGNAL(success()), SLOT(tlsHandler_success()));
connect(p.tlsHandler, SIGNAL(fail()), SLOT(tlsHandler_fail()));
connect(p.tlsHandler, SIGNAL(closed()), SLOT(tlsHandler_closed()));
connect(p.tlsHandler, SIGNAL(readyRead(const QByteArray &)), SLOT(tlsHandler_readyRead(const QByteArray &)));
connect(p.tlsHandler, SIGNAL(readyReadOutgoing(const QByteArray &, int)), SLOT(tlsHandler_readyReadOutgoing(const QByteArray &, int)));
}
#endif
void SecureLayer::init()
{
tls_done = false;
prebytes = 0;
}
void SecureLayer::write(const QByteArray &a)
{
layer.addPlain(a.size());
switch(type) {
case TLS: { p.tls->write(a); break; }
case SASL: { p.sasl->write(a); break; }
#ifdef USE_TLSHANDLER
case TLSH: { p.tlsHandler->write(a); break; }
#endif
}
}
void SecureLayer::writeIncoming(const QByteArray &a)
{
switch(type) {
case TLS: { p.tls->writeIncoming(a); break; }
case SASL: { p.sasl->writeIncoming(a); break; }
#ifdef USE_TLSHANDLER
case TLSH: { p.tlsHandler->writeIncoming(a); break; }
#endif
}
}
int SecureLayer::finished(int plain)
{
int written = 0;
// deal with prebytes (bytes sent prior to this security layer)
if(prebytes > 0) {
if(prebytes >= plain) {
written += plain;
prebytes -= plain;
plain = 0;
}
else {
written += prebytes;
plain -= prebytes;
prebytes = 0;
}
}
// put remainder into the layer tracker
if(type == SASL || tls_done)
written += layer.finished(plain);
return written;
}
void SecureLayer::tls_handshaken()
{
tls_done = true;
tlsHandshaken();
}
void SecureLayer::tls_readyRead()
{
QByteArray a = p.tls->read();
readyRead(a);
}
void SecureLayer::tls_readyReadOutgoing(int plainBytes)
{
QByteArray a = p.tls->readOutgoing();
if(tls_done)
layer.specifyEncoded(a.size(), plainBytes);
needWrite(a);
}
void SecureLayer::tls_closed()
{
QByteArray a = p.tls->readUnprocessed();
tlsClosed(a);
}
void SecureLayer::tls_error(int x)
{
error(x);
}
void SecureLayer::sasl_readyRead()
{
QByteArray a = p.sasl->read();
readyRead(a);
}
void SecureLayer::sasl_readyReadOutgoing(int plainBytes)
{
QByteArray a = p.sasl->readOutgoing();
layer.specifyEncoded(a.size(), plainBytes);
needWrite(a);
}
void SecureLayer::sasl_error(int x)
{
error(x);
}
#ifdef USE_TLSHANDLER
void SecureLayer::tlsHandler_success()
{
tls_done = true;
tlsHandshaken();
}
void SecureLayer::tlsHandler_fail()
{
error(0);
}
void SecureLayer::tlsHandler_closed()
{
tlsClosed(QByteArray());
}
void SecureLayer::tlsHandler_readyRead(const QByteArray &a)
{
readyRead(a);
}
void SecureLayer::tlsHandler_readyReadOutgoing(const QByteArray &a, int plainBytes)
{
if(tls_done)
layer.specifyEncoded(a.size(), plainBytes);
needWrite(a);
}
#endif
class SecureStream::Private
{
public:
ByteStream *bs;
QPtrList<SecureLayer> layers;
int pending;
int errorCode;
bool active;
bool topInProgress;
bool haveTLS() const
{
QPtrListIterator<SecureLayer> it(layers);
for(SecureLayer *s; (s = it.current()); ++it) {
if(s->type == SecureLayer::TLS
#ifdef USE_TLSHANDLER
|| s->type == SecureLayer::TLSH
#endif
) {
return true;
}
}
return false;
}
bool haveSASL() const
{
QPtrListIterator<SecureLayer> it(layers);
for(SecureLayer *s; (s = it.current()); ++it) {
if(s->type == SecureLayer::SASL)
return true;
}
return false;
}
};
SecureStream::SecureStream(ByteStream *s)
:ByteStream(0)
{
d = new Private;
d->bs = s;
connect(d->bs, SIGNAL(readyRead()), SLOT(bs_readyRead()));
connect(d->bs, SIGNAL(bytesWritten(int)), SLOT(bs_bytesWritten(int)));
d->layers.setAutoDelete(true);
d->pending = 0;
d->active = true;
d->topInProgress = false;
}
SecureStream::~SecureStream()
{
delete d;
}
void SecureStream::linkLayer(QObject *s)
{
connect(s, SIGNAL(tlsHandshaken()), SLOT(layer_tlsHandshaken()));
connect(s, SIGNAL(tlsClosed(const QByteArray &)), SLOT(layer_tlsClosed(const QByteArray &)));
connect(s, SIGNAL(readyRead(const QByteArray &)), SLOT(layer_readyRead(const QByteArray &)));
connect(s, SIGNAL(needWrite(const QByteArray &)), SLOT(layer_needWrite(const QByteArray &)));
connect(s, SIGNAL(error(int)), SLOT(layer_error(int)));
}
int SecureStream::calcPrebytes() const
{
int x = 0;
QPtrListIterator<SecureLayer> it(d->layers);
for(SecureLayer *s; (s = it.current()); ++it)
x += s->prebytes;
return (d->pending - x);
}
void SecureStream::startTLSClient(QCA::TLS *t, const QByteArray &spare)
{
if(!d->active || d->topInProgress || d->haveTLS())
return;
SecureLayer *s = new SecureLayer(t);
s->prebytes = calcPrebytes();
linkLayer(s);
d->layers.append(s);
d->topInProgress = true;
insertData(spare);
}
void SecureStream::startTLSServer(QCA::TLS *t, const QByteArray &spare)
{
if(!d->active || d->topInProgress || d->haveTLS())
return;
SecureLayer *s = new SecureLayer(t);
s->prebytes = calcPrebytes();
linkLayer(s);
d->layers.append(s);
d->topInProgress = true;
insertData(spare);
}
void SecureStream::setLayerSASL(QCA::SASL *sasl, const QByteArray &spare)
{
if(!d->active || d->topInProgress || d->haveSASL())
return;
SecureLayer *s = new SecureLayer(sasl);
s->prebytes = calcPrebytes();
linkLayer(s);
d->layers.append(s);
insertData(spare);
}
#ifdef USE_TLSHANDLER
void SecureStream::startTLSClient(TLSHandler *t, const QString &server, const QByteArray &spare)
{
if(!d->active || d->topInProgress || d->haveTLS())
return;
SecureLayer *s = new SecureLayer(t);
s->prebytes = calcPrebytes();
linkLayer(s);
d->layers.append(s);
d->topInProgress = true;
// unlike QCA::TLS, TLSHandler has no return value
s->p.tlsHandler->startClient(server);
insertData(spare);
}
#endif
void SecureStream::closeTLS()
{
SecureLayer *s = d->layers.getLast();
if(s) {
if(s->type == SecureLayer::TLS)
s->p.tls->close();
}
}
int SecureStream::errorCode() const
{
return d->errorCode;
}
bool SecureStream::isOpen() const
{
return d->active;
}
void SecureStream::write(const QByteArray &a)
{
if(!isOpen())
return;
d->pending += a.size();
// send to the last layer
SecureLayer *s = d->layers.getLast();
if(s)
s->write(a);
else
writeRawData(a);
}
int SecureStream::bytesToWrite() const
{
return d->pending;
}
void SecureStream::bs_readyRead()
{
QByteArray a = d->bs->read();
// send to the first layer
SecureLayer *s = d->layers.getFirst();
if(s)
s->writeIncoming(a);
else
incomingData(a);
}
void SecureStream::bs_bytesWritten(int bytes)
{
QPtrListIterator<SecureLayer> it(d->layers);
for(SecureLayer *s; (s = it.current()); ++it)
bytes = s->finished(bytes);
if(bytes > 0) {
d->pending -= bytes;
bytesWritten(bytes);
}
}
void SecureStream::layer_tlsHandshaken()
{
d->topInProgress = false;
tlsHandshaken();
}
void SecureStream::layer_tlsClosed(const QByteArray &)
{
d->active = false;
d->layers.clear();
tlsClosed();
}
void SecureStream::layer_readyRead(const QByteArray &a)
{
SecureLayer *s = (SecureLayer *)sender();
QPtrListIterator<SecureLayer> it(d->layers);
while(it.current() != s)
++it;
// pass upwards
++it;
s = it.current();
if(s)
s->writeIncoming(a);
else
incomingData(a);
}
void SecureStream::layer_needWrite(const QByteArray &a)
{
SecureLayer *s = (SecureLayer *)sender();
QPtrListIterator<SecureLayer> it(d->layers);
while(it.current() != s)
++it;
// pass downwards
--it;
s = it.current();
if(s)
s->write(a);
else
writeRawData(a);
}
void SecureStream::layer_error(int x)
{
SecureLayer *s = (SecureLayer *)sender();
int type = s->type;
d->errorCode = x;
d->active = false;
d->layers.clear();
if(type == SecureLayer::TLS)
error(ErrTLS);
else if(type == SecureLayer::SASL)
error(ErrSASL);
#ifdef USE_TLSHANDLER
else if(type == SecureLayer::TLSH)
error(ErrTLS);
#endif
}
void SecureStream::insertData(const QByteArray &a)
{
if(!a.isEmpty()) {
SecureLayer *s = d->layers.getLast();
if(s)
s->writeIncoming(a);
else
incomingData(a);
}
}
void SecureStream::writeRawData(const QByteArray &a)
{
d->bs->write(a);
}
void SecureStream::incomingData(const QByteArray &a)
{
appendRead(a);
//qDebug( "SecureStream::incomingData() got %i bytes ", a.size() );
if(bytesAvailable())
readyRead();
}
#include "securestream.moc"