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#include "qsslconfiguration.h"

#include "qsslconfiguration_p.h"

#include "qsslsocket.h"

#include "qmutex.h"

#include "qdebug.h"

QT_BEGIN_NAMESPACE

template<> void QSharedDataPointer<QSslConfigurationPrivate>::detach()

{

    if (d && d->ref == 1)

        return;

    QSslConfigurationPrivate *x = (d ? new QSslConfigurationPrivate(*d)

                                   : new QSslConfigurationPrivate);

    x->ref.ref();

    if (d && !d->ref.deref())

        delete d;

    d = x;

}

/*!

    \class QSslConfiguration

    \brief The QSslConfiguration class holds the configuration and state of an SSL connection

    \since 4.4

    \reentrant

    \inmodule QtNetwork

    \ingroup network

    \ingroup ssl

    QSslConfiguration is used by Qt networking classes to relay

    information about an open SSL connection and to allow the

    application to control certain features of that connection.

    The settings that QSslConfiguration currently supports are:

    \list

      \o The SSL/TLS protocol to be used

      \o The certificate to be presented to the peer during connection

         and its associated private key

      \o The ciphers allowed to be used for encrypting the connection

      \o The list of Certificate Authorities certificates that are

         used to validate the peer's certificate

    \endlist

    These settings are applied only during the connection

    handshake. Setting them after the connection has been established

    has no effect.

    The state that QSslConfiguration supports are:

    \list

      \o The certificate the peer presented during handshake, along

         with the chain leading to a CA certificate

      \o The cipher used to encrypt this session

    \endlist

    The state can only be obtained once the SSL connection starts, but

    not necessarily before it's done. Some settings may change during

    the course of the SSL connection without need to restart it (for

    instance, the cipher can be changed over time).

    State in QSslConfiguration objects cannot be changed.

    QSslConfiguration can be used with QSslSocket and the Network

    Access API.

    Note that changing settings in QSslConfiguration is not enough to

    change the settings in the related SSL connection. You must call

    setSslConfiguration on a modified QSslConfiguration object to

    achieve that. The following example illustrates how to change the

    protocol to TLSv1 in a QSslSocket object:

    \snippet doc/src/snippets/code/src_network_ssl_qsslconfiguration.cpp 0

    \sa QSsl::SslProtocol, QSslCertificate, QSslCipher, QSslKey

        QSslSocket, QNetworkAccessManager,

        QSslSocket::sslConfiguration(), QSslSocket::setSslConfiguration()

*/

/*!

    Constructs an empty SSL configuration. This configuration contains

    no valid settings and the state will be empty. isNull() will

    return true after this constructor is called.

    Once any setter methods are called, isNull() will return false.

*/

QSslConfiguration::QSslConfiguration()

    : d(0)

{

}

/*!

    Copies the configuration and state of \a other. If \a other is

    null, this object will be null too.

*/

QSslConfiguration::QSslConfiguration(const QSslConfiguration &other)

    : d(other.d)

{

}

/*!

    Releases any resources held by QSslConfiguration.

*/

QSslConfiguration::~QSslConfiguration()

{

    // QSharedDataPointer deletes d for us if necessary

}

/*!

    Copies the configuration and state of \a other. If \a other is

    null, this object will be null too.

*/

QSslConfiguration &QSslConfiguration::operator=(const QSslConfiguration &other)

{

    d = other.d;

    return *this;

}

/*!

    Returns true if this QSslConfiguration object is equal to \a

    other.

    Two QSslConfiguration objects are considered equal if they have

    the exact same settings and state.

    \sa operator!=()

*/

bool QSslConfiguration::operator==(const QSslConfiguration &other) const

{

    if (d == other.d)

        return true;

    return d->peerCertificate == other.d->peerCertificate &&

        d->peerCertificateChain == other.d->peerCertificateChain &&

        d->localCertificate == other.d->localCertificate &&

        d->privateKey == other.d->privateKey &&

        d->sessionCipher == other.d->sessionCipher &&

        d->ciphers == other.d->ciphers &&

        d->caCertificates == d->caCertificates &&

        d->protocol == other.d->protocol &&

        d->peerVerifyMode == other.d->peerVerifyMode &&

        d->peerVerifyDepth == other.d->peerVerifyDepth;

}

/*!

    \fn QSslConfiguration::operator!=(const QSslConfiguration &other) const

    Returns true if this QSslConfiguration differs from \a other. Two

    QSslConfiguration objects are considered different if any state or

    setting is different.

    \sa operator==()

*/

/*!

    Returns true if this is a null QSslConfiguration object.

    A QSslConfiguration object is null if it has been

    default-constructed and no setter methods have been called.

    \sa setProtocol(), setLocalCertificate(), setPrivateKey(),

        setCiphers(), setCaCertificates()

*/

bool QSslConfiguration::isNull() const

{

    return d == 0;

}

/*!

    Returns the protocol setting for this SSL configuration.

    \sa setProtocol()

*/

QSsl::SslProtocol QSslConfiguration::protocol() const

{

    return d ? d->protocol : QSsl::SslV3;

}

/*!

    Sets the protocol setting for this configuration to be \a

    protocol.

    Setting the protocol once the connection has already been

    established has no effect.

    \sa protocol()

*/

void QSslConfiguration::setProtocol(QSsl::SslProtocol protocol)

{

    d->protocol = protocol;

}

/*!

    Returns the verify mode. This mode decides whether QSslSocket should

    request a certificate from the peer (i.e., the client requests a

    certificate from the server, or a server requesting a certificate from the

    client), and whether it should require that this certificate is valid.

    The default mode is AutoVerifyPeer, which tells QSslSocket to use

    VerifyPeer for clients, QueryPeer for clients.

    \sa setPeerVerifyMode()

*/

QSslSocket::PeerVerifyMode QSslConfiguration::peerVerifyMode() const

{

    return d ? d->peerVerifyMode : QSslSocket::AutoVerifyPeer;

}

/*!

    Sets the verify mode to \a mode. This mode decides whether QSslSocket

    should request a certificate from the peer (i.e., the client requests a

    certificate from the server, or a server requesting a certificate from the

    client), and whether it should require that this certificate is valid.

    The default mode is AutoVerifyPeer, which tells QSslSocket to use

    VerifyPeer for clients, QueryPeer for clients.

    \sa peerVerifyMode()

*/

void QSslConfiguration::setPeerVerifyMode(QSslSocket::PeerVerifyMode mode)

{

    d->peerVerifyMode = mode;

}

/*!

    Returns the maximum number of certificates in the peer's certificate chain

    to be checked during the SSL handshake phase, or 0 (the default) if no

    maximum depth has been set, indicating that the whole certificate chain

    should be checked.

    The certificates are checked in issuing order, starting with the peer's

    own certificate, then its issuer's certificate, and so on.

    \sa setPeerVerifyDepth(), peerVerifyMode()

*/

int QSslConfiguration::peerVerifyDepth() const

{

    return d ? d->peerVerifyDepth : 0;

}

/*!

    Sets the maximum number of certificates in the peer's certificate chain to

    be checked during the SSL handshake phase, to \a depth. Setting a depth of

    0 means that no maximum depth is set, indicating that the whole

    certificate chain should be checked.

    The certificates are checked in issuing order, starting with the peer's

    own certificate, then its issuer's certificate, and so on.

    \sa peerVerifyDepth(), setPeerVerifyMode()

*/

void QSslConfiguration::setPeerVerifyDepth(int depth)

{

    if (depth < 0) {

        qWarning("QSslConfiguration::setPeerVerifyDepth: cannot set negative depth of %d", depth);

        return;

    }

    d->peerVerifyDepth = depth;

}

/*!

    Returns the certificate to be presented to the peer during the SSL

    handshake process.

    \sa setLocalCertificate()

*/

QSslCertificate QSslConfiguration::localCertificate() const

{

    return d ? d->localCertificate : QSslCertificate();

}

/*!

    Sets the certificate to be presented to the peer during SSL

    handshake to be \a certificate.

    Setting the certificate once the connection has been established

    has no effect.

    A certificate is the means of identification used in the SSL

    process. The local certificate is used by the remote end to verify

    the local user's identity against its list of Certification

    Authorities. In most cases, such as in HTTP web browsing, only

    servers identify to the clients, so the client does not send a

    certificate.

    \sa localCertificate()

*/

void QSslConfiguration::setLocalCertificate(const QSslCertificate &certificate)

{

    d->localCertificate = certificate;

}

/*!

    Returns the peer's digital certificate (i.e., the immediate

    certificate of the host you are connected to), or a null

    certificate, if the peer has not assigned a certificate.

    The peer certificate is checked automatically during the

    handshake phase, so this function is normally used to fetch

    the certificate for display or for connection diagnostic

    purposes. It contains information about the peer, including

    its host name, the certificate issuer, and the peer's public

    key.

    Because the peer certificate is set during the handshake phase, it

    is safe to access the peer certificate from a slot connected to

    the QSslSocket::sslErrors() signal, QNetworkReply::sslErrors()

    signal, or the QSslSocket::encrypted() signal.

    If a null certificate is returned, it can mean the SSL handshake

    failed, or it can mean the host you are connected to doesn't have

    a certificate, or it can mean there is no connection.

    If you want to check the peer's complete chain of certificates,

    use peerCertificateChain() to get them all at once.

    \sa peerCertificateChain(),

        QSslSocket::sslErrors(), QSslSocket::ignoreSslErrors(),

        QNetworkReply::sslErrors(), QNetworkReply::ignoreSslErrors()

*/

QSslCertificate QSslConfiguration::peerCertificate() const

{

    return d ? d->peerCertificate : QSslCertificate();

}

/*!

    Returns the peer's chain of digital certificates, starting with

    the peer's immediate certificate and ending with the CA's

    certificate.

    Peer certificates are checked automatically during the handshake

    phase. This function is normally used to fetch certificates for

    display, or for performing connection diagnostics. Certificates

    contain information about the peer and the certificate issuers,

    including host name, issuer names, and issuer public keys.

    Because the peer certificate is set during the handshake phase, it

    is safe to access the peer certificate from a slot connected to

    the QSslSocket::sslErrors() signal, QNetworkReply::sslErrors()

    signal, or the QSslSocket::encrypted() signal.

    If an empty list is returned, it can mean the SSL handshake

    failed, or it can mean the host you are connected to doesn't have

    a certificate, or it can mean there is no connection.

    If you want to get only the peer's immediate certificate, use

    peerCertificate().

    \sa peerCertificate(),

        QSslSocket::sslErrors(), QSslSocket::ignoreSslErrors(),

        QNetworkReply::sslErrors(), QNetworkReply::ignoreSslErrors()

*/

QList<QSslCertificate> QSslConfiguration::peerCertificateChain() const

{

    return d ? d->peerCertificateChain : QList<QSslCertificate>();

}

/*!

    Returns the socket's cryptographic \l {QSslCipher} {cipher}, or a

    null cipher if the connection isn't encrypted. The socket's cipher

    for the session is set during the handshake phase. The cipher is

    used to encrypt and decrypt data transmitted through the socket.

    The SSL infrastructure also provides functions for setting the

    ordered list of ciphers from which the handshake phase will

    eventually select the session cipher. This ordered list must be in

    place before the handshake phase begins.

    \sa ciphers(), setCiphers(), QSslSocket::supportedCiphers()

*/

QSslCipher QSslConfiguration::sessionCipher() const

{

    return d ? d->sessionCipher : QSslCipher();

}

/*!

    Returns the \l {QSslKey} {SSL key} assigned to this connection or

    a null key if none has been assigned yet.

    \sa setPrivateKey(), localCertificate()

*/

QSslKey QSslConfiguration::privateKey() const

{

    return d ? d->privateKey : QSslKey();

}

/*!

    Sets the connection's private \l {QSslKey} {key} to \a key. The

    private key and the local \l {QSslCertificate} {certificate} are

    used by clients and servers that must prove their identity to

    SSL peers.

    Both the key and the local certificate are required if you are

    creating an SSL server socket. If you are creating an SSL client

    socket, the key and local certificate are required if your client

    must identify itself to an SSL server.

    \sa privateKey(), setLocalCertificate()

*/

void QSslConfiguration::setPrivateKey(const QSslKey &key)

{

    d->privateKey = key;

}

/*!

    Returns this connection's current cryptographic cipher suite. This

    list is used during the handshake phase for choosing a

    session cipher. The returned list of ciphers is ordered by

    descending preference. (i.e., the first cipher in the list is the

    most preferred cipher). The session cipher will be the first one

    in the list that is also supported by the peer.

    By default, the handshake phase can choose any of the ciphers

    supported by this system's SSL libraries, which may vary from

    system to system. The list of ciphers supported by this system's

    SSL libraries is returned by QSslSocket::supportedCiphers(). You can restrict

    the list of ciphers used for choosing the session cipher for this

    socket by calling setCiphers() with a subset of the supported

    ciphers. You can revert to using the entire set by calling

    setCiphers() with the list returned by QSslSocket::supportedCiphers().

    \sa setCiphers(), QSslSocket::supportedCiphers()

*/

QList<QSslCipher> QSslConfiguration::ciphers() const

{

    return d ? d->ciphers : QList<QSslCipher>();

}

/*!

    Sets the cryptographic cipher suite for this socket to \a ciphers,

    which must contain a subset of the ciphers in the list returned by

    supportedCiphers().

    Restricting the cipher suite must be done before the handshake

    phase, where the session cipher is chosen.

    \sa ciphers(), QSslSocket::supportedCiphers()

*/

void QSslConfiguration::setCiphers(const QList<QSslCipher> &ciphers)

{

    d->ciphers = ciphers;

}

/*!

  Returns this connection's CA certificate database. The CA certificate

  database is used by the socket during the handshake phase to

  validate the peer's certificate. It can be moodified prior to the

  handshake with addCaCertificate(), addCaCertificates(), and

  setCaCertificates().

  \sa setCaCertificates()

*/

QList<QSslCertificate> QSslConfiguration::caCertificates() const

{

    return d ? d->caCertificates : QList<QSslCertificate>();

}

/*!

  Sets this socket's CA certificate database to be \a certificates.

  The certificate database must be set prior to the SSL handshake.

  The CA certificate database is used by the socket during the

  handshake phase to validate the peer's certificate.

  \sa caCertificates()

*/

void QSslConfiguration::setCaCertificates(const QList<QSslCertificate> &certificates)

{

    d->caCertificates = certificates;

}

/*!

    Returns the default SSL configuration to be used in new SSL

    connections.

    The default SSL configuration consists of:

    \list

      \o no local certificate and no private key

      \o protocol SSLv3

      \o the system's default CA certificate list

      \o the cipher list equal to the list of the SSL libraries'

         supported SSL ciphers

    \endlist

    \sa QSslSocket::supportedCiphers(), setDefaultConfiguration()

*/

QSslConfiguration QSslConfiguration::defaultConfiguration()