tcpslavebase.cpp

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/*
 * Copyright (C) 2000 Alex Zepeda <zipzippy@sonic.net>
 * Copyright (C) 2001-2003 George Staikos <staikos@kde.org>
 * Copyright (C) 2001 Dawit Alemayehu <adawit@kde.org>
 * Copyright (C) 2007,2008 Andreas Hartmetz <ahartmetz@gmail.com>
 * Copyright (C) 2008 Roland Harnau <tau@gmx.eu>
 * Copyright (C) 2010 Richard Moore <rich@kde.org>
 *
 * This file is part of the KDE project
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "tcpslavebase.h"

#include <config.h>

#include <kdebug.h>
#include <kconfiggroup.h>
#include <ksslcertificatemanager.h>
#include <ksslsettings.h>
#include <kmessagebox.h>
#include <klocale.h>
#include <ktoolinvocation.h>
#include <network/ktcpsocket.h>

#include <QtCore/QDataStream>
#include <QtCore/QTime>
#include <QtNetwork/QTcpSocket>
#include <QtNetwork/QHostInfo>
#include <QtNetwork/QSslConfiguration>
#include <QtDBus/QtDBus>


using namespace KIO;
//using namespace KNetwork;

typedef QMap<QString, QString> StringStringMap;
Q_DECLARE_METATYPE(StringStringMap)

namespace KIO {
Q_DECLARE_OPERATORS_FOR_FLAGS(TCPSlaveBase::SslResult)
}

//TODO Proxy support whichever way works; KPAC reportedly does *not* work.
//NOTE kded_proxyscout may or may not be interesting

//TODO resurrect SSL session recycling; this means save the session on disconnect and look
//for a reusable session on connect. Consider how HTTP persistent connections interact with that.

//TODO in case we support SSL-lessness we need static KTcpSocket::sslAvailable() and check it
//in most places we ATM check for d->isSSL.

//TODO check if d->isBlocking is honored everywhere it makes sense

//TODO fold KSSLSetting and KSSLCertificateHome into KSslSettings and use that everywhere.

//TODO recognize partially encrypted websites as "somewhat safe"

/* List of dialogs/messageboxes we need to use (current code location in parentheses)
 - Can the "dontAskAgainName" thing be improved?

 - "SSLCertDialog" [select client cert] (SlaveInterface)
 - Enter password for client certificate (inline)
 - Password for client cert was wrong. Please reenter. (inline)
 - Setting client cert failed. [doesn't give reason] (inline)
 - "SSLInfoDialog" [mostly server cert info] (SlaveInterface)
 - You are about to enter secure mode. Security information/Display SSL information/Connect (inline)
 - You are about to leave secure mode. Security information/Continue loading/Abort (inline)
 - Hostname mismatch: Continue/Details/Cancel (inline)
 - IP address mismatch: Continue/Details/Cancel (inline)
 - Certificate failed authenticity check: Continue/Details/Cancel (inline)
 - Would you like to accept this certificate forever: Yes/No/Current sessions only (inline)
 */


class TCPSlaveBase::TcpSlaveBasePrivate
{
public:
    TcpSlaveBasePrivate(TCPSlaveBase* qq) : q(qq) {}

    void setSslMetaData()
    {
        sslMetaData.insert("ssl_in_use", "TRUE");
        KSslCipher cipher = socket.sessionCipher();
        sslMetaData.insert("ssl_protocol_version", socket.negotiatedSslVersionName());
        QString sslCipher = cipher.encryptionMethod() + '\n';
        sslCipher += cipher.authenticationMethod() + '\n';
        sslCipher += cipher.keyExchangeMethod() + '\n';
        sslCipher += cipher.digestMethod();
        sslMetaData.insert("ssl_cipher", sslCipher);
        sslMetaData.insert("ssl_cipher_name", cipher.name());
        sslMetaData.insert("ssl_cipher_used_bits", QString::number(cipher.usedBits()));
        sslMetaData.insert("ssl_cipher_bits", QString::number(cipher.supportedBits()));
        sslMetaData.insert("ssl_peer_ip", ip);

        // try to fill in the blanks, i.e. missing certificates, and just assume that
        // those belong to the peer (==website or similar) certificate.
        for (int i = 0; i < sslErrors.count(); i++) {
            if (sslErrors[i].certificate().isNull()) {
                sslErrors[i] = KSslError(sslErrors[i].error(),
                                        socket.peerCertificateChain()[0]);
            }
        }

        QString errorStr;
        // encode the two-dimensional numeric error list using '\n' and '\t' as outer and inner separators
        Q_FOREACH (const QSslCertificate &cert, socket.peerCertificateChain()) {
            Q_FOREACH (const KSslError &error, sslErrors) {
                if (error.certificate() == cert) {
                    errorStr += QString::number(static_cast<int>(error.error())) + '\t';
                }
            }
            if (errorStr.endsWith('\t')) {
                errorStr.chop(1);
            }
            errorStr += '\n';
        }
        errorStr.chop(1);
        sslMetaData.insert("ssl_cert_errors", errorStr);

        QString peerCertChain;
        Q_FOREACH (const QSslCertificate &cert, socket.peerCertificateChain()) {
            peerCertChain.append(cert.toPem());
            peerCertChain.append('\x01');
        }
        peerCertChain.chop(1);
        sslMetaData.insert("ssl_peer_chain", peerCertChain);
        sendSslMetaData();
    }

    void clearSslMetaData()
    {
        sslMetaData.clear();
        sslMetaData.insert("ssl_in_use", "FALSE");
        sendSslMetaData();
    }

    void sendSslMetaData()
    {
        MetaData::ConstIterator it = sslMetaData.constBegin();
        for (; it != sslMetaData.constEnd(); ++it) {
            q->setMetaData(it.key(), it.value());
        }
    }

    SslResult startTLSInternal(KTcpSocket::SslVersion sslVersion,
                               const QSslConfiguration& configuration = QSslConfiguration(),
                               int waitForEncryptedTimeout = -1);

    TCPSlaveBase* q;

    bool isBlocking;

    KTcpSocket socket;

    QString host;
    QString ip;
    quint16 port;
    QByteArray serviceName;

    KSSLSettings sslSettings;
    bool usingSSL;
    bool autoSSL;
    bool sslNoUi; // If true, we just drop the connection silently
                  // if SSL certificate check fails in some way.
    QList<KSslError> sslErrors;

    MetaData sslMetaData;
};


//### uh, is this a good idea??
QIODevice *TCPSlaveBase::socket() const
{
    return &d->socket;
}


TCPSlaveBase::TCPSlaveBase(const QByteArray &protocol,
                           const QByteArray &poolSocket,
                           const QByteArray &appSocket,
                           bool autoSSL)
 : SlaveBase(protocol, poolSocket, appSocket),
   d(new TcpSlaveBasePrivate(this))
{
    d->isBlocking = true;
    d->port = 0;
    d->serviceName = protocol;
    d->usingSSL = false;
    d->autoSSL = autoSSL;
    d->sslNoUi = false;
    // Limit the read buffer size to 14 MB (14*1024*1024) (based on the upload limit
    // in TransferJob::slotDataReq). See the docs for QAbstractSocket::setReadBufferSize
    // and the BR# 187876 to understand why setting this limit is necessary.
    d->socket.setReadBufferSize(14680064);
}


TCPSlaveBase::~TCPSlaveBase()
{
    delete d;
}


ssize_t TCPSlaveBase::write(const char *data, ssize_t len)
{
    ssize_t written = d->socket.write(data, len);
    if (written == -1) {
        kDebug(7027) << "d->socket.write() returned -1! Socket error is"
                     << d->socket.error() << ", Socket state is" << d->socket.state();
    }

    bool success = false;
    if (d->isBlocking) {
        // Drain the tx buffer
        success = d->socket.waitForBytesWritten(-1);
    } else {
        // ### I don't know how to make sure that all data does get written at some point
        // without doing it now. There is no event loop to do it behind the scenes.
        // Polling in the dispatch() loop? Something timeout based?
        success = d->socket.waitForBytesWritten(0);
    }

    d->socket.flush();  //this is supposed to get the data on the wire faster

    if (d->socket.state() != KTcpSocket::ConnectedState || !success) {
        kDebug(7027) << "Write failed, will return -1! Socket error is"
                     << d->socket.error() << ", Socket state is" << d->socket.state()
                     << "Return value of waitForBytesWritten() is" << success;
        return -1;
    }

    return written;
}


ssize_t TCPSlaveBase::read(char* data, ssize_t len)
{
    if (d->usingSSL && (d->socket.encryptionMode() != KTcpSocket::SslClientMode)) {
        d->clearSslMetaData();
        kDebug(7029) << "lost SSL connection.";
        return -1;
    }

    if (!d->socket.bytesAvailable()) {
        const int timeout = d->isBlocking ? -1 : (readTimeout() * 1000);
        d->socket.waitForReadyRead(timeout);
    }
#if 0
    // Do not do this because its only benefit is to cause a nasty side effect
    // upstream in Qt. See BR# 260769.
    else if (d->socket.encryptionMode() != KTcpSocket::SslClientMode ||
               QNetworkProxy::applicationProxy().type() == QNetworkProxy::NoProxy) {
        // we only do this when it doesn't trigger Qt socket bugs. When it doesn't break anything
        // it seems to help performance.
        d->socket.waitForReadyRead(0);
    }
#endif
    return d->socket.read(data, len);
}


ssize_t TCPSlaveBase::readLine(char *data, ssize_t len)
{
    if (d->usingSSL && (d->socket.encryptionMode() != KTcpSocket::SslClientMode)) {
        d->clearSslMetaData();
        kDebug(7029) << "lost SSL connection.";
        return -1;
    }

    const int timeout = (d->isBlocking ? -1: (readTimeout() * 1000));
    ssize_t readTotal = 0;
    do {
        if (!d->socket.bytesAvailable())
            d->socket.waitForReadyRead(timeout);
        ssize_t readStep = d->socket.readLine(&data[readTotal], len-readTotal);
        if (readStep == -1 || (readStep == 0 && d->socket.state() != KTcpSocket::ConnectedState)) {
            return -1;
        }
        readTotal += readStep;
    } while (readTotal == 0 || data[readTotal-1] != '\n');

    return readTotal;
}


bool TCPSlaveBase::connectToHost(const QString &/*protocol*/,
                                 const QString &host,
                                 quint16 port)
{
    QString errorString;
    const int errCode = connectToHost(host, port, &errorString);
    if (errCode == 0)
        return true;

    error(errCode, errorString);
    return false;
}

int TCPSlaveBase::connectToHost(const QString& host, quint16 port, QString* errorString)
{
    d->clearSslMetaData(); //We have separate connection and SSL setup phases

    if (errorString) {
        errorString->clear();  // clear prior error messages.
    }

    d->socket.setVerificationPeerName(host); // Used for ssl certificate verification (SNI)

    //  - leaving SSL - warn before we even connect
    //### see if it makes sense to move this into the HTTP ioslave which is the only
    //    user.
    if (metaData("main_frame_request") == "TRUE"  //### this looks *really* unreliable
          && metaData("ssl_activate_warnings") == "TRUE"
          && metaData("ssl_was_in_use") == "TRUE"
          && !d->autoSSL) {
        KSSLSettings kss;
        if (kss.warnOnLeave()) {
            int result = messageBox(i18n("You are about to leave secure "
                                         "mode. Transmissions will no "
                                         "longer be encrypted.\nThis "
                                         "means that a third party could "
                                         "observe your data in transit."),
                                    WarningContinueCancel,
                                    i18n("Security Information"),
                                    i18n("C&ontinue Loading"), QString(),
                                    "WarnOnLeaveSSLMode");

            if (result == KMessageBox::Cancel) {
                if (errorString)
                    *errorString = host;
                return ERR_USER_CANCELED;
            }
        }
    }

    /*
      By default the SSL handshake attempt uses these settings in the order shown:

      1.) Protocol: KTcpSocket::SecureProtocols   SSL compression: ON  (DEFAULT)
      2.) Protocol: KTcpSocket::SecureProtocols   SSL compression: OFF
      3.) Protocol: KTcpSocket::TlsV1             SSL compression: ON
      4.) Protocol: KTcpSocket::TlsV1             SSL compression: OFF
      5.) Protocol: KTcpSocket::SslV3             SSL compression: ON
      6.) Protocol: KTcpSocket::SslV3             SSL compression: OFF

      If any combination other than the one marked DEFAULT is used to complete
      the SSL handshake, then that combination will be cached using KIO's internal
      meta-data mechanism in order to speed up future connections to the same host.
    */

    QSslConfiguration sslConfig = d->socket.sslConfiguration();
#if QT_VERSION >= 0x040800
    const bool isSslCompressionDisabled = sslConfig.testSslOption(QSsl::SslOptionDisableCompression);
    const bool shouldSslCompressBeDisabled = config()->readEntry("LastUsedSslDisableCompressionFlag", isSslCompressionDisabled);
    sslConfig.setSslOption(QSsl::SslOptionDisableCompression, shouldSslCompressBeDisabled);
#endif
    
    const int lastSslVerson = config()->readEntry("LastUsedSslVersion", static_cast<int>(KTcpSocket::SecureProtocols));
    KTcpSocket::SslVersion trySslVersion = static_cast<KTcpSocket::SslVersion>(lastSslVerson);
    KTcpSocket::SslVersions alreadyTriedSslVersions = trySslVersion;

    const int timeout = (connectTimeout() * 1000);
    while (true) {
        disconnectFromHost();  //Reset some state, even if we are already disconnected
        d->host = host;

        d->socket.connectToHost(host, port);
        const bool connectOk = d->socket.waitForConnected(timeout > -1 ? timeout : -1);

        kDebug(7027) << "Socket: state=" << d->socket.state()
                     << ", error=" << d->socket.error()
                     << ", connected?" << connectOk;

        if (d->socket.state() != KTcpSocket::ConnectedState) {
            if (errorString)
                *errorString = host + QLatin1String(": ") + d->socket.errorString();
            switch (d->socket.error()) {
            case KTcpSocket::UnsupportedSocketOperationError:
                return ERR_UNSUPPORTED_ACTION;
            case KTcpSocket::RemoteHostClosedError:
                return ERR_CONNECTION_BROKEN;
            case KTcpSocket::SocketTimeoutError:
                return ERR_SERVER_TIMEOUT;
            case KTcpSocket::HostNotFoundError:
                return ERR_UNKNOWN_HOST;
            default:
                return ERR_COULD_NOT_CONNECT;
            }
        }

        //### check for proxyAuthenticationRequiredError

        d->ip = d->socket.peerAddress().toString();
        d->port = d->socket.peerPort();

        if (d->autoSSL) {
            SslResult res = d->startTLSInternal(trySslVersion, sslConfig, 30000 /*30 secs timeout*/);
            if ((res & ResultFailed) && (res & ResultFailedEarly)) {
#if QT_VERSION >= 0x040800
                if (!sslConfig.testSslOption(QSsl::SslOptionDisableCompression)) {
                    sslConfig.setSslOption(QSsl::SslOptionDisableCompression, true);
                    continue;
                }
#endif

                if (!(alreadyTriedSslVersions & KTcpSocket::SecureProtocols)) {
                    trySslVersion = KTcpSocket::SecureProtocols;
                    alreadyTriedSslVersions |= trySslVersion;
#if QT_VERSION >= 0x040800
                    sslConfig.setSslOption(QSsl::SslOptionDisableCompression, false);
#endif
                    continue;
                }

                if (!(alreadyTriedSslVersions & KTcpSocket::TlsV1)) {
                    trySslVersion = KTcpSocket::TlsV1;
                    alreadyTriedSslVersions |= trySslVersion;
#if QT_VERSION >= 0x040800
                    sslConfig.setSslOption(QSsl::SslOptionDisableCompression, false);
#endif
                    continue;
                }

                if (!(alreadyTriedSslVersions & KTcpSocket::SslV3)) {
                    trySslVersion = KTcpSocket::SslV3;
                    alreadyTriedSslVersions |= trySslVersion;
#if QT_VERSION >= 0x040800
                    sslConfig.setSslOption(QSsl::SslOptionDisableCompression, false);
#endif
                    continue;
                }
            }

            //### SSL 2.0 is (close to) dead and it's a good thing, too.
            if (res & ResultFailed) {
                if (errorString)
                    *errorString = i18nc("%1 is a host name", "%1: SSL negotiation failed", host);
                return ERR_COULD_NOT_CONNECT;
            }
        }
        // If the SSL handshake was done with anything protocol other than the default,
        // save that information so that any subsequent requests do not have to do thesame thing.
        if (trySslVersion != KTcpSocket::SecureProtocols && lastSslVerson == KTcpSocket::SecureProtocols) {
            setMetaData(QLatin1String("{internal~currenthost}LastUsedSslVersion"),
                        QString::number(trySslVersion));
        }
#if QT_VERSION >= 0x040800
        if (sslConfig.testSslOption(QSsl::SslOptionDisableCompression) && !shouldSslCompressBeDisabled) {
            setMetaData(QLatin1String("{internal~currenthost}LastUsedSslDisableCompressionFlag"),
                        QString::number(true));
        }
#endif
        return 0;
    }
    Q_ASSERT(false);
    // Code flow never gets here but let's make the compiler happy.
    // More: the stack allocation of QSslSettings seems to be confusing the compiler;
    //       in fact, any non-POD allocation does. 
    //       even a 'return 0;' directly after the allocation (so before the while(true))
    //       is ignored. definitely seems to be a compiler bug? - aseigo
    return 0;
}

void TCPSlaveBase::disconnectFromHost()
{
    kDebug(7027);
    d->host.clear();
    d->ip.clear();
    d->usingSSL = false;

    if (d->socket.state() == KTcpSocket::UnconnectedState) {
        // discard incoming data - the remote host might have disconnected us in the meantime
        // but the visible effect of disconnectFromHost() should stay the same.
        d->socket.close();
        return;
    }

    //### maybe save a session for reuse on SSL shutdown if and when QSslSocket
    //    does that. QCA::TLS can do it apparently but that is not enough if
    //    we want to present that as KDE API. Not a big loss in any case.
    d->socket.disconnectFromHost();
    if (d->socket.state() != KTcpSocket::UnconnectedState)
        d->socket.waitForDisconnected(-1); // wait for unsent data to be sent
    d->socket.close(); //whatever that means on a socket
}

bool TCPSlaveBase::isAutoSsl() const
{
    return d->autoSSL;
}

bool TCPSlaveBase::isUsingSsl() const
{
    return d->usingSSL;
}

quint16 TCPSlaveBase::port() const
{
    return d->port;
}

bool TCPSlaveBase::atEnd() const
{
    return d->socket.atEnd();
}

bool TCPSlaveBase::startSsl()
{
    if (d->usingSSL)
        return false;
    return d->startTLSInternal(KTcpSocket::TlsV1) & ResultOk;
}

// Find out if a hostname matches an SSL certificate's Common Name (including wildcards)
static bool isMatchingHostname(const QString &cnIn, const QString &hostnameIn)
{
    const QString cn = cnIn.toLower();
    const QString hostname = hostnameIn.toLower();

    const int wildcard = cn.indexOf(QLatin1Char('*'));

    // Check this is a wildcard cert, if not then just compare the strings
    if (wildcard < 0)
        return cn == hostname;

    const int firstCnDot = cn.indexOf(QLatin1Char('.'));
    const int secondCnDot = cn.indexOf(QLatin1Char('.'), firstCnDot+1);

    // Check at least 3 components
    if ((-1 == secondCnDot) || (secondCnDot+1 >= cn.length()))
        return false;

    // Check * is last character of 1st component (ie. there's a following .)
    if (wildcard+1 != firstCnDot)
        return false;

    // Check only one star
    if (cn.lastIndexOf(QLatin1Char('*')) != wildcard)
        return false;

    // Check characters preceding * (if any) match
    if (wildcard && (hostname.leftRef(wildcard) != cn.leftRef(wildcard)))
        return false;

    // Check characters following first . match
    if (hostname.midRef(hostname.indexOf(QLatin1Char('.'))) != cn.midRef(firstCnDot))
        return false;

    // Check if the hostname is an IP address, if so then wildcards are not allowed
    QHostAddress addr(hostname);
    if (!addr.isNull())
        return false;

    // Ok, I guess this was a wildcard CN and the hostname matches.
    return true;
}

TCPSlaveBase::SslResult TCPSlaveBase::TcpSlaveBasePrivate::startTLSInternal (KTcpSocket::SslVersion version,
                                                                             const QSslConfiguration& sslConfig,
                                                                             int waitForEncryptedTimeout)
{
    q->selectClientCertificate();

    //setMetaData("ssl_session_id", d->kssl->session()->toString());
    //### we don't support session reuse for now...
    usingSSL = true;
#if QT_VERSION >= 0x040800
    kDebug(7027) << "Trying SSL handshake with protocol:" << version
                 << ", SSL compression ON:" << sslConfig.testSslOption(QSsl::SslOptionDisableCompression);
#endif
    // Set the SSL version to use...
    socket.setAdvertisedSslVersion(version);

    // Set SSL configuration information
    if (!sslConfig.isNull())
        socket.setSslConfiguration(sslConfig);

    /* Usually ignoreSslErrors() would be called in the slot invoked by the sslErrors()
       signal but that would mess up the flow of control. We will check for errors
       anyway to decide if we want to continue connecting. Otherwise ignoreSslErrors()
       before connecting would be very insecure. */
    socket.ignoreSslErrors();
    socket.startClientEncryption();
    const bool encryptionStarted = socket.waitForEncrypted(waitForEncryptedTimeout);

    //Set metadata, among other things for the "SSL Details" dialog
    KSslCipher cipher = socket.sessionCipher();

    if (!encryptionStarted || socket.encryptionMode() != KTcpSocket::SslClientMode
        || cipher.isNull() || cipher.usedBits() == 0 || socket.peerCertificateChain().isEmpty()) {
        usingSSL = false;
        clearSslMetaData();
        kDebug(7029) << "Initial SSL handshake failed. encryptionStarted is"
                     << encryptionStarted << ", cipher.isNull() is" << cipher.isNull()
                     << ", cipher.usedBits() is" << cipher.usedBits()
                     << ", length of certificate chain is" << socket.peerCertificateChain().count()
                     << ", the socket says:" << socket.errorString()
                     << "and the list of SSL errors contains"
                     << socket.sslErrors().count() << "items.";
        Q_FOREACH(const KSslError& sslError, socket.sslErrors()) {
            kDebug(7029) << "SSL ERROR: (" << sslError.error() << ")" << sslError.errorString();
        }
        return ResultFailed | ResultFailedEarly;
    }

    kDebug(7029) << "Cipher info - "
                 << " advertised SSL protocol version" << socket.advertisedSslVersion()
                 << " negotiated SSL protocol version" << socket.negotiatedSslVersion()
                 << " authenticationMethod:" << cipher.authenticationMethod()
                 << " encryptionMethod:" << cipher.encryptionMethod()
                 << " keyExchangeMethod:" << cipher.keyExchangeMethod()
                 << " name:" << cipher.name()
                 << " supportedBits:" << cipher.supportedBits()
                 << " usedBits:" << cipher.usedBits();

    // Since we connect by IP (cf. KIO::HostInfo) the SSL code will not recognize
    // that the site certificate belongs to the domain. We therefore do the
    // domain<->certificate matching here.
    sslErrors = socket.sslErrors();
    QSslCertificate peerCert = socket.peerCertificateChain().first();
    QMutableListIterator<KSslError> it(sslErrors);
    while (it.hasNext()) {
        // As of 4.4.0 Qt does not assign a certificate to the QSslError it emits
        // *in the case of HostNameMismatch*. A HostNameMismatch, however, will always
        // be an error of the peer certificate so we just don't check the error's
        // certificate().

        // Remove all HostNameMismatch, we have to redo name checking later.
        if (it.next().error() == KSslError::HostNameMismatch) {
            it.remove();
        }
    }
    // Redo name checking here and (re-)insert HostNameMismatch to sslErrors if
    // host name does not match any of the names in server certificate.
    // QSslSocket may not report HostNameMismatch error, when server
    // certificate was issued for the IP we are connecting to.
    QStringList domainPatterns(peerCert.subjectInfo(QSslCertificate::CommonName));
    domainPatterns += peerCert.alternateSubjectNames().values(QSsl::DnsEntry);
    bool names_match = false;
    foreach (const QString &dp, domainPatterns) {
        if (isMatchingHostname(dp, host)) {
            names_match = true;
            break;
        }
    }
    if (!names_match) {
        sslErrors.insert(0, KSslError(KSslError::HostNameMismatch, peerCert));
    }

    // TODO: review / rewrite / remove the comment
    // The app side needs the metadata now for the SSL error dialog (if any) but
    // the same metadata will be needed later, too. When "later" arrives the slave
    // may actually be connected to a different application that doesn't know
    // the metadata the slave sent to the previous application.
    // The quite important SSL indicator icon in Konqi's URL bar relies on metadata
    // from here, for example. And Konqi will be the second application to connect
    // to the slave.
    // Therefore we choose to have our metadata and send it, too :)
    setSslMetaData();
    q->sendAndKeepMetaData();

    SslResult rc = q->verifyServerCertificate();
    if (rc & ResultFailed) {
        usingSSL = false;
        clearSslMetaData();
        kDebug(7029) << "server certificate verification failed.";
        socket.disconnectFromHost();     //Make the connection fail (cf. ignoreSslErrors())
        return ResultFailed;
    } else if (rc & ResultOverridden) {
        kDebug(7029) << "server certificate verification failed but continuing at user's request.";
    }

    //"warn" when starting SSL/TLS
    if (q->metaData("ssl_activate_warnings") == "TRUE"
        && q->metaData("ssl_was_in_use") == "FALSE"
        && sslSettings.warnOnEnter()) {

        int msgResult = q->messageBox(i18n("You are about to enter secure mode. "
                                        "All transmissions will be encrypted "
                                        "unless otherwise noted.\nThis means "
                                        "that no third party will be able to "
                                        "easily observe your data in transit."),
                                   WarningYesNo,
                                   i18n("Security Information"),
                                   i18n("Display SSL &Information"),
                                   i18n("C&onnect"),
                                   "WarnOnEnterSSLMode");
        if (msgResult == KMessageBox::Yes) {
            q->messageBox(SSLMessageBox /*==the SSL info dialog*/, host);
        }
    }

    return rc;
}

void TCPSlaveBase::selectClientCertificate()
{
#if 0 //hehe
    QString certname;   // the cert to use this session
    bool send = false, prompt = false, save = false, forcePrompt = false;
    KSSLCertificateHome::KSSLAuthAction aa;

    setMetaData("ssl_using_client_cert", "FALSE"); // we change this if needed

    if (metaData("ssl_no_client_cert") == "TRUE") return;
    forcePrompt = (metaData("ssl_force_cert_prompt") == "TRUE");

    // Delete the old cert since we're certainly done with it now
    if (d->pkcs) {
        delete d->pkcs;
        d->pkcs = NULL;
    }

    if (!d->kssl) return;

    // Look for a general certificate
    if (!forcePrompt) {
        certname = KSSLCertificateHome::getDefaultCertificateName(&aa);
        switch (aa) {
        case KSSLCertificateHome::AuthSend:
            send = true; prompt = false;
            break;
        case KSSLCertificateHome::AuthDont:
            send = false; prompt = false;
            certname.clear();
            break;
        case KSSLCertificateHome::AuthPrompt:
            send = false; prompt = true;
            break;
        default:
            break;
        }
    }

    // Look for a certificate on a per-host basis as an override
    QString tmpcn = KSSLCertificateHome::getDefaultCertificateName(d->host, &aa);
    if (aa != KSSLCertificateHome::AuthNone) {   // we must override
        switch (aa) {
        case KSSLCertificateHome::AuthSend:
            send = true;
            prompt = false;
            certname = tmpcn;
            break;
        case KSSLCertificateHome::AuthDont:
            send = false;
            prompt = false;
            certname.clear();
            break;
        case KSSLCertificateHome::AuthPrompt:
            send = false;
            prompt = true;
            certname = tmpcn;
            break;
        default:
            break;
        }
    }

    // Finally, we allow the application to override anything.
    if (hasMetaData("ssl_demand_certificate")) {
        certname = metaData("ssl_demand_certificate");
        if (!certname.isEmpty()) {
            forcePrompt = false;
            prompt = false;
            send = true;
        }
    }

    if (certname.isEmpty() && !prompt && !forcePrompt) return;

    // Ok, we're supposed to prompt the user....
    if (prompt || forcePrompt) {
        QStringList certs = KSSLCertificateHome::getCertificateList();

        QStringList::const_iterator it = certs.begin();
        while (it != certs.end()) {
            KSSLPKCS12 *pkcs = KSSLCertificateHome::getCertificateByName(*it);
            if (pkcs && (!pkcs->getCertificate() ||
                         !pkcs->getCertificate()->x509V3Extensions().certTypeSSLClient())) {
                it = certs.erase(it);
            } else {
                ++it;
            }
            delete pkcs;
        }

        if (certs.isEmpty()) return;  // we had nothing else, and prompt failed

        if (!QDBusConnection::sessionBus().interface()->isServiceRegistered("org.kde.kio.uiserver")) {
            KToolInvocation::startServiceByDesktopPath("kuiserver.desktop",
                    QStringList());
        }

        QDBusInterface uis("org.kde.kio.uiserver", "/UIServer", "org.kde.KIO.UIServer");

        QDBusMessage retVal = uis.call("showSSLCertDialog", d->host, certs, metaData("window-id").toLongLong());
        if (retVal.type() == QDBusMessage::ReplyMessage) {
            if (retVal.arguments().at(0).toBool()) {
                send = retVal.arguments().at(1).toBool();
                save = retVal.arguments().at(2).toBool();
                certname = retVal.arguments().at(3).toString();
            }
        }
    }

    // The user may have said to not send the certificate,
    // but to save the choice
    if (!send) {
        if (save) {
            KSSLCertificateHome::setDefaultCertificate(certname, d->host,
                    false, false);
        }
        return;
    }

    // We're almost committed.  If we can read the cert, we'll send it now.
    KSSLPKCS12 *pkcs = KSSLCertificateHome::getCertificateByName(certname);
    if (!pkcs && KSSLCertificateHome::hasCertificateByName(certname)) {           // We need the password
        KIO::AuthInfo ai;
        bool first = true;
        do {
            ai.prompt = i18n("Enter the certificate password:");
            ai.caption = i18n("SSL Certificate Password");
            ai.url.setProtocol("kssl");
            ai.url.setHost(certname);
            ai.username = certname;
            ai.keepPassword = true;

            bool showprompt;
            if (first)
                showprompt = !checkCachedAuthentication(ai);
            else
                showprompt = true;
            if (showprompt) {
                if (!openPasswordDialog(ai, first ? QString() :
                                        i18n("Unable to open the certificate. Try a new password?")))
                    break;
            }

            first = false;
            pkcs = KSSLCertificateHome::getCertificateByName(certname, ai.password);
        } while (!pkcs);

    }

    // If we could open the certificate, let's send it
    if (pkcs) {
        if (!d->kssl->setClientCertificate(pkcs)) {
            messageBox(Information, i18n("The procedure to set the "
                                         "client certificate for the session "
                                         "failed."), i18n("SSL"));
            delete pkcs;  // we don't need this anymore
            pkcs = 0L;
        } else {
            kDebug(7029) << "Client SSL certificate is being used.";
            setMetaData("ssl_using_client_cert", "TRUE");
            if (save) {
                KSSLCertificateHome::setDefaultCertificate(certname, d->host,
                        true, false);
            }
        }
        d->pkcs = pkcs;
    }
#endif
}

TCPSlaveBase::SslResult TCPSlaveBase::verifyServerCertificate()
{
    d->sslNoUi = hasMetaData("ssl_no_ui") && (metaData("ssl_no_ui") != "FALSE");

    if (d->sslErrors.isEmpty()) {
        return ResultOk;
    } else if (d->sslNoUi) {
        return ResultFailed;
    }

    QList<KSslError> fatalErrors = KSslCertificateManager::nonIgnorableErrors(d->sslErrors);
    if (!fatalErrors.isEmpty()) {
        //TODO message "sorry, fatal error, you can't override it"
        return ResultFailed;
    }

    KSslCertificateManager *const cm = KSslCertificateManager::self();
    KSslCertificateRule rule = cm->rule(d->socket.peerCertificateChain().first(), d->host);

    // remove previously seen and acknowledged errors
    QList<KSslError> remainingErrors = rule.filterErrors(d->sslErrors);
    if (remainingErrors.isEmpty()) {
        kDebug(7029) << "Error list empty after removing errors to be ignored. Continuing.";
        return ResultOk | ResultOverridden;
    }

    //### We don't ask to permanently reject the certificate

    QString message = i18n("The server failed the authenticity check (%1).\n\n", d->host);
    Q_FOREACH (const KSslError &err, d->sslErrors) {
        message.append(err.errorString());
        message.append('\n');
    }
    message = message.trimmed();

    int msgResult;
    do {
        msgResult = messageBox(WarningYesNoCancel, message,
                               i18n("Server Authentication"),
                               i18n("&Details"), i18n("Co&ntinue"));
        if (msgResult == KMessageBox::Yes) {
            //Details was chosen- show the certificate and error details
            messageBox(SSLMessageBox /*the SSL info dialog*/, d->host);
        } else if (msgResult == KMessageBox::Cancel) {
            return ResultFailed;
        }
        //fall through on KMessageBox::No
    } while (msgResult == KMessageBox::Yes);

    //Save the user's choice to ignore the SSL errors.

    msgResult = messageBox(WarningYesNo,
                            i18n("Would you like to accept this "
                                 "certificate forever without "
                                 "being prompted?"),
                            i18n("Server Authentication"),
                            i18n("&Forever"),
                            i18n("&Current Session only"));
    QDateTime ruleExpiry = QDateTime::currentDateTime();
    if (msgResult == KMessageBox::Yes) {
        //accept forever ("for a very long time")
        ruleExpiry = ruleExpiry.addYears(1000);
    } else {
        //accept "for a short time", half an hour.
        ruleExpiry = ruleExpiry.addSecs(30*60);
    }

    //TODO special cases for wildcard domain name in the certificate!
    //rule = KSslCertificateRule(d->socket.peerCertificateChain().first(), whatever);

    rule.setExpiryDateTime(ruleExpiry);
    rule.setIgnoredErrors(d->sslErrors);
    cm->setRule(rule);

    return ResultOk | ResultOverridden;
#if 0 //### need to to do something like the old code about the main and subframe stuff
    kDebug(7029) << "SSL HTTP frame the parent? " << metaData("main_frame_request");
    if (!hasMetaData("main_frame_request") || metaData("main_frame_request") == "TRUE") {
        // Since we're the parent, we need to teach the child.
        setMetaData("ssl_parent_ip", d->ip);
        setMetaData("ssl_parent_cert", pc.toString());
        //  - Read from cache and see if there is a policy for this
        KSSLCertificateCache::KSSLCertificatePolicy cp =
            d->certCache->getPolicyByCertificate(pc);

        //  - validation code
        if (ksv != KSSLCertificate::Ok) {
            if (d->sslNoUi) {
                return -1;
            }

            if (cp == KSSLCertificateCache::Unknown ||
                    cp == KSSLCertificateCache::Ambiguous) {
                cp = KSSLCertificateCache::Prompt;
            } else {
                // A policy was already set so let's honor that.
                permacache = d->certCache->isPermanent(pc);
            }

            if (!_IPmatchesCN && cp == KSSLCertificateCache::Accept) {
                cp = KSSLCertificateCache::Prompt;
//            ksv = KSSLCertificate::Ok;
            }


        //  - cache the results
        d->certCache->addCertificate(pc, cp, permacache);
        if (doAddHost) d->certCache->addHost(pc, d->host);
    } else {    // Child frame
        //  - Read from cache and see if there is a policy for this
        KSSLCertificateCache::KSSLCertificatePolicy cp =
            d->certCache->getPolicyByCertificate(pc);
        isChild = true;

        // Check the cert and IP to make sure they're the same
        // as the parent frame
        bool certAndIPTheSame = (d->ip == metaData("ssl_parent_ip") &&
                                 pc.toString() == metaData("ssl_parent_cert"));

        if (ksv == KSSLCertificate::Ok) {
            if (certAndIPTheSame) {       // success
                rc = 1;
                setMetaData("ssl_action", "accept");
            } else {
                /*
                if (d->sslNoUi) {
                  return -1;
                }
                result = messageBox(WarningYesNo,
                                    i18n("The certificate is valid but does not appear to have been assigned to this server.  Do you wish to continue loading?"),
                                    i18n("Server Authentication"));
                if (result == KMessageBox::Yes) {     // success
                  rc = 1;
                  setMetaData("ssl_action", "accept");
                } else {    // fail
                  rc = -1;
                  setMetaData("ssl_action", "reject");
                }
                */
                setMetaData("ssl_action", "accept");
                rc = 1;   // Let's accept this now.  It's bad, but at least the user
                // will see potential attacks in KDE3 with the pseudo-lock
                // icon on the toolbar, and can investigate with the RMB
            }
        } else {
            if (d->sslNoUi) {
                return -1;
            }

            if (cp == KSSLCertificateCache::Accept) {
                if (certAndIPTheSame) {    // success
                    rc = 1;
                    setMetaData("ssl_action", "accept");
                } else {   // fail
                    result = messageBox(WarningYesNo,
                                        i18n("You have indicated that you wish to accept this certificate, but it is not issued to the server who is presenting it. Do you wish to continue loading?"),
                                        i18n("Server Authentication"));
                    if (result == KMessageBox::Yes) {
                        rc = 1;
                        setMetaData("ssl_action", "accept");
                        d->certCache->addHost(pc, d->host);
                    } else {
                        rc = -1;
                        setMetaData("ssl_action", "reject");
                    }
                }
            } else if (cp == KSSLCertificateCache::Reject) {      // fail
                messageBox(Information, i18n("SSL certificate is being rejected as requested. You can disable this in the KDE System Settings."),
                           i18n("Server Authentication"));
                rc = -1;
                setMetaData("ssl_action", "reject");
            } else {


    return rc;
#endif //#if 0
    return ResultOk | ResultOverridden;
}


bool TCPSlaveBase::isConnected() const
{
    //QSslSocket::isValid() and therefore KTcpSocket::isValid() are shady...
    return d->socket.state() == KTcpSocket::ConnectedState;
}


bool TCPSlaveBase::waitForResponse(int t)
{
    if (d->socket.bytesAvailable()) {
        return true;
    }
    return d->socket.waitForReadyRead(t * 1000);
}

void TCPSlaveBase::setBlocking(bool b)
{
    if (!b) {
        kWarning(7029) << "Caller requested non-blocking mode, but that doesn't work";
        return;
    }
    d->isBlocking = b;
}

void TCPSlaveBase::virtual_hook(int id, void* data)
{
    if (id == SlaveBase::AppConnectionMade) {
        d->sendSslMetaData();
    } else {
        SlaveBase::virtual_hook(id, data);
    }
}