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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QDTLS_OPENSSL_P_H
#define QDTLS_OPENSSL_P_H
#include <private/qtnetworkglobal_p.h>
#include <QtCore/qglobal.h>
#include <openssl/ossl_typ.h>
#include "qdtls_p.h"
#include <private/qsslcontext_openssl_p.h>
#include <private/qsslsocket_openssl_p.h>
#include <QtNetwork/qsslpresharedkeyauthenticator.h>
#include <QtNetwork/qhostaddress.h>
#include <QtCore/qcryptographichash.h>
#include <QtCore/qsharedpointer.h>
#include <QtCore/qbytearray.h>
#include <QtCore/qvector.h>
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
QT_REQUIRE_CONFIG(openssl);
QT_REQUIRE_CONFIG(dtls);
QT_BEGIN_NAMESPACE
class QDtlsPrivateOpenSSL;
class QUdpSocket;
namespace dtlsopenssl
{
class DtlsState
{
public:
// Note, bioMethod _must_ outlive BIOs it was used to create. Thus
// the order of declarations here matters.
using BioMethod = QSharedPointer<BIO_METHOD>;
BioMethod bioMethod;
using TlsContext = QSharedPointer<QSslContext>;
TlsContext tlsContext;
using TlsConnection = QSharedPointer<SSL>;
TlsConnection tlsConnection;
QByteArray dgram;
QHostAddress remoteAddress;
quint16 remotePort = 0;
QVector<QSslErrorEntry> x509Errors;
long peeking = false;
QUdpSocket *udpSocket = nullptr;
bool writeSuppressed = false;
bool init(QDtlsBasePrivate *dtlsBase, QUdpSocket *socket,
const QHostAddress &remote, quint16 port,
const QByteArray &receivedMessage);
void reset();
QDtlsPrivateOpenSSL *dtlsPrivate = nullptr;
QByteArray secret;
#ifdef QT_CRYPTOGRAPHICHASH_ONLY_SHA1
QCryptographicHash::Algorithm hashAlgorithm = QCryptographicHash::Sha1;
#else
QCryptographicHash::Algorithm hashAlgorithm = QCryptographicHash::Sha256;
#endif
private:
bool initTls(QDtlsBasePrivate *dtlsBase);
bool initCtxAndConnection(QDtlsBasePrivate *dtlsBase);
bool initBIO(QDtlsBasePrivate *dtlsBase);
void setLinkMtu(QDtlsBasePrivate *dtlsBase);
};
} // namespace dtlsopenssl
class QDtlsClientVerifierOpenSSL : public QDtlsClientVerifierPrivate
{
public:
QDtlsClientVerifierOpenSSL();
bool verifyClient(QUdpSocket *socket, const QByteArray &dgram,
const QHostAddress &address, quint16 port) override;
private:
dtlsopenssl::DtlsState dtls;
};
class QDtlsPrivateOpenSSL : public QDtlsPrivate
{
public:
QDtlsPrivateOpenSSL();
bool startHandshake(QUdpSocket *socket, const QByteArray &datagram) override;
bool continueHandshake(QUdpSocket *socket, const QByteArray &datagram) override;
bool resumeHandshake(QUdpSocket *socket) override;
void abortHandshake(QUdpSocket *socket) override;
bool handleTimeout(QUdpSocket *socket) override;
void sendShutdownAlert(QUdpSocket *socket) override;
qint64 writeDatagramEncrypted(QUdpSocket *socket, const QByteArray &datagram) override;
QByteArray decryptDatagram(QUdpSocket *socket, const QByteArray &tlsdgram) override;
unsigned pskClientCallback(const char *hint, char *identity, unsigned max_identity_len,
unsigned char *psk, unsigned max_psk_len);
unsigned pskServerCallback(const char *identity, unsigned char *psk,
unsigned max_psk_len);
private:
bool verifyPeer();
void storePeerCertificates();
bool tlsErrorsWereIgnored() const;
void fetchNegotiatedParameters();
void reportTimeout();
void resetDtls();
QVector<QSslErrorEntry> opensslErrors;
dtlsopenssl::DtlsState dtls;
// We have to externally handle timeouts since we have non-blocking
// sockets and OpenSSL(DTLS) with non-blocking UDP sockets does not
// know if a timeout has occurred.
struct TimeoutHandler : QObject
{
TimeoutHandler() = default;
void start(int hintMs = 0);
void doubleTimeout();
void resetTimeout() {timeoutMs = 1000;}
void stop();
void timerEvent(QTimerEvent *event);
int timerId = -1;
int timeoutMs = 1000;
QDtlsPrivateOpenSSL *dtlsConnection = nullptr;
};
// We will initialize it 'lazily', just in case somebody wants to move
// QDtls to another thread.
QScopedPointer<TimeoutHandler> timeoutHandler;
bool connectionWasShutdown = false;
QSslPreSharedKeyAuthenticator pskAuthenticator;
QByteArray identityHint;
Q_DECLARE_PUBLIC(QDtls)
};
QT_END_NAMESPACE
#endif // QDTLS_OPENSSL_P_H
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