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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QDTLS_OPENSSL_P_H
#define QDTLS_OPENSSL_P_H
#include <QtNetwork/private/qtnetworkglobal_p.h>
#include "qsslcontext_openssl_p.h"
#include "qtlsbackend_openssl_p.h"
#include "qtls_openssl_p.h"
#include "qopenssl_p.h"
#include "../shared/qdtls_base_p.h"
#include <QtNetwork/private/qdtls_p.h>
#include <QtNetwork/qsslpresharedkeyauthenticator.h>
#include <QtNetwork/qhostaddress.h>
#include <QtCore/qsharedpointer.h>
#include <QtCore/qbytearray.h>
#include <QtCore/qglobal.h>
#include <QtCore/qlist.h>
#include <openssl/ossl_typ.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 QDtlsBasePrivate;
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 = std::shared_ptr<QSslContext>;
TlsContext tlsContext;
using TlsConnection = QSharedPointer<SSL>;
TlsConnection tlsConnection;
QByteArray dgram;
QHostAddress remoteAddress;
quint16 remotePort = 0;
QList<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
// The trick with 'right' ancestor in the tree overriding (only once) some shared
// virtual functions is intentional. Too bad MSVC warns me about ... exactly the
// feature of C++ that I want to use.
QT_WARNING_PUSH
QT_WARNING_DISABLE_MSVC(4250)
class QDtlsClientVerifierOpenSSL : public QTlsPrivate::DtlsCookieVerifier, public QDtlsBasePrivate
{
public:
QDtlsClientVerifierOpenSSL();
bool verifyClient(QUdpSocket *socket, const QByteArray &dgram,
const QHostAddress &address, quint16 port) override;
QByteArray verifiedHello() const override;
private:
dtlsopenssl::DtlsState dtls;
QByteArray verifiedClientHello;
};
class QDtlsPrivateOpenSSL : public QTlsPrivate::DtlsCryptograph, public QDtlsBasePrivate
{
public:
QDtlsPrivateOpenSSL(QDtls *qObject, QSslSocket::SslMode mode);
private:
QSslSocket::SslMode cryptographMode() const override;
void setPeer(const QHostAddress &addr, quint16 port, const QString &name) override;
QHostAddress peerAddress() const override;
quint16 peerPort() const override;
void setPeerVerificationName(const QString &name) override;
QString peerVerificationName() const override;
virtual void setDtlsMtuHint(quint16 mtu) override;
virtual quint16 dtlsMtuHint() const override;
virtual QDtls::HandshakeState state() const override;
virtual bool isConnectionEncrypted() const override;
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;
QList<QSslError> peerVerificationErrors() const override;
void ignoreVerificationErrors(const QList<QSslError> &errorsToIgnore) override;
QSslCipher dtlsSessionCipher() const override;
QSsl::SslProtocol dtlsSessionProtocol() const override;
qint64 writeDatagramEncrypted(QUdpSocket *socket, const QByteArray &datagram) override;
QByteArray decryptDatagram(QUdpSocket *socket, const QByteArray &tlsdgram) override;
public:
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();
QList<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) override;
int timerId = -1;
int timeoutMs = 1000;
QDtlsPrivateOpenSSL *dtlsConnection = nullptr;
};
QDtls *q = nullptr;
QDtls::HandshakeState handshakeState = QDtls::HandshakeNotStarted;
QList<QSslError> tlsErrors;
QList<QSslError> tlsErrorsToIgnore;
bool connectionEncrypted = false;
// 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;
};
QT_WARNING_POP // C4250
QT_END_NAMESPACE
#endif // QDTLS_OPENSSL_P_H
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