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// SPDX-FileCopyrightText: 2010 Jeremy Lainé <jeremy.laine@m4x.org>
//
// SPDX-License-Identifier: LGPL-2.1-or-later
#include "QXmppIncomingServer.h"
#include "QXmppConstants_p.h"
#include "QXmppDialback.h"
#include "QXmppOutgoingServer.h"
#include "QXmppStartTlsPacket.h"
#include "QXmppStreamFeatures.h"
#include "QXmppUtils.h"
#include <QDomElement>
#include <QHostAddress>
#include <QSslKey>
#include <QSslSocket>
class QXmppIncomingServerPrivate
{
public:
QXmppIncomingServerPrivate(QXmppIncomingServer *qq);
QString origin() const;
QSet<QString> authenticated;
QString domain;
QString localStreamId;
private:
QXmppIncomingServer *q;
};
QXmppIncomingServerPrivate::QXmppIncomingServerPrivate(QXmppIncomingServer *qq)
: q(qq)
{
}
QString QXmppIncomingServerPrivate::origin() const
{
QSslSocket *socket = q->socket();
if (socket) {
return socket->peerAddress().toString() + " " + QString::number(socket->peerPort());
} else {
return "<unknown>";
}
}
/// Constructs a new incoming server stream.
///
/// \param socket The socket for the XMPP stream.
/// \param domain The local domain.
/// \param parent The parent QObject for the stream (optional).
///
QXmppIncomingServer::QXmppIncomingServer(QSslSocket *socket, const QString &domain, QObject *parent)
: QXmppStream(parent)
{
d = new QXmppIncomingServerPrivate(this);
d->domain = domain;
if (socket) {
connect(socket, &QAbstractSocket::disconnected,
this, &QXmppIncomingServer::slotSocketDisconnected);
setSocket(socket);
}
info(QString("Incoming server connection from %1").arg(d->origin()));
}
/// Destroys the current stream.
QXmppIncomingServer::~QXmppIncomingServer()
{
delete d;
}
/// Returns the stream's identifier.
///
QString QXmppIncomingServer::localStreamId() const
{
return d->localStreamId;
}
/// \cond
void QXmppIncomingServer::handleStream(const QDomElement &streamElement)
{
const QString from = streamElement.attribute("from");
if (!from.isEmpty()) {
info(QString("Incoming server stream from %1 on %2").arg(from, d->origin()));
}
// start stream
d->localStreamId = QXmppUtils::generateStanzaHash().toLatin1();
QString data = QString("<?xml version='1.0'?><stream:stream"
" xmlns='%1' xmlns:db='%2' xmlns:stream='%3'"
" id='%4' version=\"1.0\">")
.arg(
ns_server,
ns_server_dialback,
ns_stream,
d->localStreamId);
sendData(data.toUtf8());
// send stream features
QXmppStreamFeatures features;
if (!socket()->isEncrypted() && !socket()->localCertificate().isNull() && !socket()->privateKey().isNull()) {
features.setTlsMode(QXmppStreamFeatures::Enabled);
}
sendPacket(features);
}
void QXmppIncomingServer::handleStanza(const QDomElement &stanza)
{
if (QXmppStartTlsPacket::isStartTlsPacket(stanza, QXmppStartTlsPacket::StartTls)) {
sendPacket(QXmppStartTlsPacket(QXmppStartTlsPacket::Proceed));
socket()->flush();
socket()->startServerEncryption();
return;
} else if (QXmppDialback::isDialback(stanza)) {
QXmppDialback request;
request.parse(stanza);
// check the request is valid
if (!request.type().isEmpty() ||
request.from().isEmpty() ||
request.to() != d->domain ||
request.key().isEmpty()) {
warning(QString("Invalid dialback received on %1").arg(d->origin()));
return;
}
const QString domain = request.from();
if (request.command() == QXmppDialback::Result) {
debug(QString("Received a dialback result from '%1' on %2").arg(domain, d->origin()));
// establish dialback connection
auto *stream = new QXmppOutgoingServer(d->domain, this);
connect(stream, &QXmppOutgoingServer::dialbackResponseReceived,
this, &QXmppIncomingServer::slotDialbackResponseReceived);
stream->setVerify(d->localStreamId, request.key());
stream->connectToHost(domain);
} else if (request.command() == QXmppDialback::Verify) {
debug(QString("Received a dialback verify from '%1' on %2").arg(domain, d->origin()));
Q_EMIT dialbackRequestReceived(request);
}
} else if (d->authenticated.contains(QXmppUtils::jidToDomain(stanza.attribute("from")))) {
// relay stanza if the remote party is authenticated
Q_EMIT elementReceived(stanza);
} else {
warning(QString("Received an element from unverified domain '%1' on %2").arg(QXmppUtils::jidToDomain(stanza.attribute("from")), d->origin()));
disconnectFromHost();
}
}
/// \endcond
/// Returns true if the socket is connected and the remote server is
/// authenticated.
///
bool QXmppIncomingServer::isConnected() const
{
return QXmppStream::isConnected() && !d->authenticated.isEmpty();
}
/// Handles a dialback response received from the authority server.
///
/// \param response
///
void QXmppIncomingServer::slotDialbackResponseReceived(const QXmppDialback &dialback)
{
auto *stream = qobject_cast<QXmppOutgoingServer *>(sender());
if (!stream ||
dialback.command() != QXmppDialback::Verify ||
dialback.id() != d->localStreamId ||
dialback.from() != stream->remoteDomain()) {
return;
}
// relay verify response
QXmppDialback response;
response.setCommand(QXmppDialback::Result);
response.setTo(dialback.from());
response.setFrom(d->domain);
response.setType(dialback.type());
sendPacket(response);
// check for success
if (response.type() == QLatin1String("valid")) {
info(QString("Verified incoming domain '%1' on %2").arg(dialback.from(), d->origin()));
const bool wasConnected = !d->authenticated.isEmpty();
d->authenticated.insert(dialback.from());
if (!wasConnected) {
Q_EMIT connected();
}
} else {
warning(QString("Failed to verify incoming domain '%1' on %2").arg(dialback.from(), d->origin()));
disconnectFromHost();
}
// disconnect dialback
stream->disconnectFromHost();
stream->deleteLater();
}
void QXmppIncomingServer::slotSocketDisconnected()
{
info(QString("Socket disconnected from %1").arg(d->origin()));
Q_EMIT disconnected();
}
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