aboutsummaryrefslogtreecommitdiff
path: root/src/qt/paymentserver.cpp
blob: d66a722078456db3719e0475a7f2e881b5c611a7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
// Copyright (c) 2011-2013 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "paymentserver.h"

#include "bitcoinunits.h"
#include "guiconstants.h"
#include "guiutil.h"
#include "optionsmodel.h"
#include "paymentserver.h"
#include "walletmodel.h"

#include "base58.h"
#include "ui_interface.h"
#include "wallet.h"

#include <cstdlib>

#include <openssl/x509.h>
#include <openssl/x509_vfy.h>
#include <QApplication>
#include <QByteArray>
#include <QDataStream>
#include <QDateTime>
#include <QDebug>
#include <QFile>
#include <QFileOpenEvent>
#include <QHash>
#include <QList>
#include <QLocalServer>
#include <QLocalSocket>
#include <QNetworkAccessManager>
#include <QNetworkProxy>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QSslCertificate>
#include <QSslError>
#include <QSslSocket>
#include <QStringList>
#include <QTextDocument>

#if QT_VERSION < 0x050000
#include <QUrl>
#else
#include <QUrlQuery>
#endif

using namespace boost;

const int BITCOIN_IPC_CONNECT_TIMEOUT = 1000; // milliseconds
const QString BITCOIN_IPC_PREFIX("bitcoin:");
const char* BITCOIN_REQUEST_MIMETYPE = "application/bitcoin-paymentrequest";
const char* BITCOIN_PAYMENTACK_MIMETYPE = "application/bitcoin-paymentack";
const char* BITCOIN_PAYMENTACK_CONTENTTYPE = "application/bitcoin-payment";

X509_STORE* PaymentServer::certStore = NULL;
void PaymentServer::freeCertStore()
{
    if (PaymentServer::certStore != NULL)
    {
        X509_STORE_free(PaymentServer::certStore);
        PaymentServer::certStore = NULL;
    }
}

//
// Create a name that is unique for:
//  testnet / non-testnet
//  data directory
//
static QString ipcServerName()
{
    QString name("BitcoinQt");

    // Append a simple hash of the datadir
    // Note that GetDataDir(true) returns a different path
    // for -testnet versus main net
    QString ddir(QString::fromStdString(GetDataDir(true).string()));
    name.append(QString::number(qHash(ddir)));

    return name;
}

//
// We store payment URIs and requests received before
// the main GUI window is up and ready to ask the user
// to send payment.

static QList<QString> savedPaymentRequests;

static void ReportInvalidCertificate(const QSslCertificate& cert)
{
    qDebug() << "ReportInvalidCertificate : Payment server found an invalid certificate: " << cert.subjectInfo(QSslCertificate::CommonName);
}

//
// Load OpenSSL's list of root certificate authorities
//
void PaymentServer::LoadRootCAs(X509_STORE* _store)
{
    if (PaymentServer::certStore == NULL)
        atexit(PaymentServer::freeCertStore);
    else
        freeCertStore();

    // Unit tests mostly use this, to pass in fake root CAs:
    if (_store)
    {
        PaymentServer::certStore = _store;
        return;
    }

    // Normal execution, use either -rootcertificates or system certs:
    PaymentServer::certStore = X509_STORE_new();

    // Note: use "-system-" default here so that users can pass -rootcertificates=""
    // and get 'I don't like X.509 certificates, don't trust anybody' behavior:
    QString certFile = QString::fromStdString(GetArg("-rootcertificates", "-system-"));

    if (certFile.isEmpty())
        return; // Empty store

    QList<QSslCertificate> certList;

    if (certFile != "-system-")
    {
        certList = QSslCertificate::fromPath(certFile);
        // Use those certificates when fetching payment requests, too:
        QSslSocket::setDefaultCaCertificates(certList);
    }
    else
        certList = QSslSocket::systemCaCertificates ();

    int nRootCerts = 0;
    const QDateTime currentTime = QDateTime::currentDateTime();
    foreach (const QSslCertificate& cert, certList)
    {
        if (currentTime < cert.effectiveDate() || currentTime > cert.expiryDate()) {
            ReportInvalidCertificate(cert);
            continue;
        }
#if QT_VERSION >= 0x050000
        if (cert.isBlacklisted()) {
            ReportInvalidCertificate(cert);
            continue;
        }
#endif
        QByteArray certData = cert.toDer();
        const unsigned char *data = (const unsigned char *)certData.data();

        X509* x509 = d2i_X509(0, &data, certData.size());
        if (x509 && X509_STORE_add_cert(PaymentServer::certStore, x509))
        {
            // Note: X509_STORE_free will free the X509* objects when
            // the PaymentServer is destroyed
            ++nRootCerts;
        }
        else
        {
            ReportInvalidCertificate(cert);
            continue;
        }
    }
    qDebug() << "PaymentServer::LoadRootCAs : Loaded " << nRootCerts << " root certificates";

    // Project for another day:
    // Fetch certificate revocation lists, and add them to certStore.
    // Issues to consider:
    //   performance (start a thread to fetch in background?)
    //   privacy (fetch through tor/proxy so IP address isn't revealed)
    //   would it be easier to just use a compiled-in blacklist?
    //    or use Qt's blacklist?
    //   "certificate stapling" with server-side caching is more efficient
}

//
// Sending to the server is done synchronously, at startup.
// If the server isn't already running, startup continues,
// and the items in savedPaymentRequest will be handled
// when uiReady() is called.
//
bool PaymentServer::ipcSendCommandLine(int argc, char* argv[])
{
    bool fResult = false;

    for (int i = 1; i < argc; i++)
    {
        QString arg(argv[i]);
        if (arg.startsWith("-"))
            continue;

        if (arg.startsWith(BITCOIN_IPC_PREFIX, Qt::CaseInsensitive)) // bitcoin: URI
        {
            savedPaymentRequests.append(arg);

            SendCoinsRecipient r;
            if (GUIUtil::parseBitcoinURI(arg, &r))
            {
                CBitcoinAddress address(r.address.toStdString());

                SelectParams(CChainParams::MAIN);
                if (!address.IsValid())
                {
                    SelectParams(CChainParams::TESTNET);
                }
            }
        }
        else if (QFile::exists(arg)) // Filename
        {
            savedPaymentRequests.append(arg);

            PaymentRequestPlus request;
            if (readPaymentRequest(arg, request))
            {
                if (request.getDetails().network() == "main")
                    SelectParams(CChainParams::MAIN);
                else
                    SelectParams(CChainParams::TESTNET);
            }
        }
        else
        {
            // Printing to debug.log is about the best we can do here, the
            // GUI hasn't started yet so we can't pop up a message box.
            qDebug() << "PaymentServer::ipcSendCommandLine : Payment request file does not exist: " << arg;
        }
    }

    foreach (const QString& r, savedPaymentRequests)
    {
        QLocalSocket* socket = new QLocalSocket();
        socket->connectToServer(ipcServerName(), QIODevice::WriteOnly);
        if (!socket->waitForConnected(BITCOIN_IPC_CONNECT_TIMEOUT))
            return false;

        QByteArray block;
        QDataStream out(&block, QIODevice::WriteOnly);
        out.setVersion(QDataStream::Qt_4_0);
        out << r;
        out.device()->seek(0);
        socket->write(block);
        socket->flush();

        socket->waitForBytesWritten(BITCOIN_IPC_CONNECT_TIMEOUT);
        socket->disconnectFromServer();
        delete socket;
        fResult = true;
    }

    return fResult;
}

PaymentServer::PaymentServer(QObject* parent, bool startLocalServer) :
    QObject(parent),
    saveURIs(true),
    uriServer(0),
    netManager(0),
    optionsModel(0)
{
    // Verify that the version of the library that we linked against is
    // compatible with the version of the headers we compiled against.
    GOOGLE_PROTOBUF_VERIFY_VERSION;

    // Install global event filter to catch QFileOpenEvents
    // on Mac: sent when you click bitcoin: links
    // other OSes: helpful when dealing with payment request files (in the future)
    if (parent)
        parent->installEventFilter(this);

    QString name = ipcServerName();

    // Clean up old socket leftover from a crash:
    QLocalServer::removeServer(name);

    if (startLocalServer)
    {
        uriServer = new QLocalServer(this);

        if (!uriServer->listen(name))
            qDebug() << "PaymentServer::PaymentServer : Cannot start bitcoin: click-to-pay handler";
        else {
            connect(uriServer, SIGNAL(newConnection()), this, SLOT(handleURIConnection()));
            connect(this, SIGNAL(receivedPaymentACK(QString)), this, SLOT(handlePaymentACK(QString)));
        }
    }
}

PaymentServer::~PaymentServer()
{
    google::protobuf::ShutdownProtobufLibrary();
}

//
// OSX-specific way of handling bitcoin: URIs and
// PaymentRequest mime types
//
bool PaymentServer::eventFilter(QObject *, QEvent *event)
{
    // clicking on bitcoin: URIs creates FileOpen events on the Mac:
    if (event->type() == QEvent::FileOpen)
    {
        QFileOpenEvent* fileEvent = static_cast<QFileOpenEvent*>(event);
        if (!fileEvent->file().isEmpty())
            handleURIOrFile(fileEvent->file());
        else if (!fileEvent->url().isEmpty())
            handleURIOrFile(fileEvent->url().toString());

        return true;
    }
    return false;
}

void PaymentServer::initNetManager()
{
    if (!optionsModel)
        return;
    if (netManager != NULL)
        delete netManager;

    // netManager is used to fetch paymentrequests given in bitcoin: URIs
    netManager = new QNetworkAccessManager(this);

    // Use proxy settings from optionsModel
    QString proxyIP;
    quint16 proxyPort;
    if (optionsModel->getProxySettings(proxyIP, proxyPort))
    {
        QNetworkProxy proxy;
        proxy.setType(QNetworkProxy::Socks5Proxy);
        proxy.setHostName(proxyIP);
        proxy.setPort(proxyPort);
        netManager->setProxy(proxy);
    }

    connect(netManager, SIGNAL(finished(QNetworkReply*)),
            this, SLOT(netRequestFinished(QNetworkReply*)));
    connect(netManager, SIGNAL(sslErrors(QNetworkReply*, const QList<QSslError> &)),
            this, SLOT(reportSslErrors(QNetworkReply*, const QList<QSslError> &)));
}

void PaymentServer::uiReady()
{
    initNetManager();

    saveURIs = false;
    foreach (const QString& s, savedPaymentRequests)
    {
        handleURIOrFile(s);
    }
    savedPaymentRequests.clear();
}

void PaymentServer::handleURIOrFile(const QString& s)
{
    if (saveURIs)
    {
        savedPaymentRequests.append(s);
        return;
    }

    if (s.startsWith(BITCOIN_IPC_PREFIX, Qt::CaseInsensitive)) // bitcoin:
    {
#if QT_VERSION < 0x050000
        QUrl uri(s);
#else
        QUrlQuery uri((QUrl(s)));
#endif
        if (uri.hasQueryItem("r"))
        {
            QByteArray temp;
            temp.append(uri.queryItemValue("r"));
            QString decoded = QUrl::fromPercentEncoding(temp);
            QUrl fetchUrl(decoded, QUrl::StrictMode);

            qDebug() << "PaymentServer::handleURIOrFile : fetchRequest(" << fetchUrl << ")";

            if (fetchUrl.isValid())
                fetchRequest(fetchUrl);
            else
                qDebug() << "PaymentServer::handleURIOrFile : Invalid URL: " << fetchUrl;

            return;
        }

        SendCoinsRecipient recipient;
        if (GUIUtil::parseBitcoinURI(s, &recipient))
            emit receivedPaymentRequest(recipient);
        else
            emit message(tr("URI handling"),
                tr("URI can not be parsed! This can be caused by an invalid Bitcoin address or malformed URI parameters."),
                CClientUIInterface::ICON_WARNING);

        return;
    }

    if (QFile::exists(s))
    {
        PaymentRequestPlus request;
        SendCoinsRecipient recipient;
        if (readPaymentRequest(s, request) && processPaymentRequest(request, recipient))
            emit receivedPaymentRequest(recipient);

        return;
    }
}

void PaymentServer::handleURIConnection()
{
    QLocalSocket *clientConnection = uriServer->nextPendingConnection();

    while (clientConnection->bytesAvailable() < (int)sizeof(quint32))
        clientConnection->waitForReadyRead();

    connect(clientConnection, SIGNAL(disconnected()),
            clientConnection, SLOT(deleteLater()));

    QDataStream in(clientConnection);
    in.setVersion(QDataStream::Qt_4_0);
    if (clientConnection->bytesAvailable() < (int)sizeof(quint16)) {
        return;
    }
    QString msg;
    in >> msg;

    handleURIOrFile(msg);
}

bool PaymentServer::readPaymentRequest(const QString& filename, PaymentRequestPlus& request)
{
    QFile f(filename);
    if (!f.open(QIODevice::ReadOnly))
    {
        qDebug() << "PaymentServer::readPaymentRequest : Failed to open " << filename;
        return false;
    }

    if (f.size() > MAX_PAYMENT_REQUEST_SIZE)
    {
        qDebug() << "PaymentServer::readPaymentRequest : " << filename << " too large";
        return false;
    }

    QByteArray data = f.readAll();

    return request.parse(data);
}

bool PaymentServer::processPaymentRequest(PaymentRequestPlus& request, SendCoinsRecipient& recipient)
{
    if (!optionsModel)
        return false;

    recipient.paymentRequest = request;
    recipient.message = GUIUtil::HtmlEscape(request.getDetails().memo());

    request.getMerchant(PaymentServer::certStore, recipient.authenticatedMerchant);

    QList<std::pair<CScript, qint64> > sendingTos = request.getPayTo();
    QStringList addresses;

    foreach(const PAIRTYPE(CScript, qint64)& sendingTo, sendingTos) {
        // Extract and check destination addresses
        CTxDestination dest;
        if (ExtractDestination(sendingTo.first, dest)) {
            // Append destination address
            addresses.append(QString::fromStdString(CBitcoinAddress(dest).ToString()));
        }
        else if (!recipient.authenticatedMerchant.isEmpty()){
            // Insecure payments to custom bitcoin addresses are not supported
            // (there is no good way to tell the user where they are paying in a way
            // they'd have a chance of understanding).
            emit message(tr("Payment request error"),
                tr("Unverified payment requests to custom payment scripts are unsupported."),
                CClientUIInterface::MSG_ERROR);
            return false;
        }

        // Extract and check amounts
        CTxOut txOut(sendingTo.second, sendingTo.first);
        if (txOut.IsDust(CTransaction::nMinRelayTxFee)) {
            QString msg = tr("Requested payment amount of %1 is too small (considered dust).")
                .arg(BitcoinUnits::formatWithUnit(optionsModel->getDisplayUnit(), sendingTo.second));

            qDebug() << "PaymentServer::processPaymentRequest : " << msg;
            emit message(tr("Payment request error"), msg, CClientUIInterface::MSG_ERROR);
            return false;
        }

        recipient.amount += sendingTo.second;
    }
    // Store addresses and format them to fit nicely into the GUI
    recipient.address = addresses.join("<br />");

    if (!recipient.authenticatedMerchant.isEmpty()) {
        qDebug() << "PaymentServer::processPaymentRequest : Secure payment request from " << recipient.authenticatedMerchant;
    }
    else {
        qDebug() << "PaymentServer::processPaymentRequest : Insecure payment request to " << addresses.join(", ");
    }

    return true;
}

void PaymentServer::fetchRequest(const QUrl& url)
{
    QNetworkRequest netRequest;
    netRequest.setAttribute(QNetworkRequest::User, "PaymentRequest");
    netRequest.setUrl(url);
    netRequest.setRawHeader("User-Agent", CLIENT_NAME.c_str());
    netRequest.setRawHeader("Accept", BITCOIN_REQUEST_MIMETYPE);
    netManager->get(netRequest);
}

void PaymentServer::fetchPaymentACK(CWallet* wallet, SendCoinsRecipient recipient, QByteArray transaction)
{
    const payments::PaymentDetails& details = recipient.paymentRequest.getDetails();
    if (!details.has_payment_url())
        return;

    QNetworkRequest netRequest;
    netRequest.setAttribute(QNetworkRequest::User, "PaymentACK");
    netRequest.setUrl(QString::fromStdString(details.payment_url()));
    netRequest.setHeader(QNetworkRequest::ContentTypeHeader, BITCOIN_PAYMENTACK_CONTENTTYPE);
    netRequest.setRawHeader("User-Agent", CLIENT_NAME.c_str());
    netRequest.setRawHeader("Accept", BITCOIN_PAYMENTACK_MIMETYPE);

    payments::Payment payment;
    payment.set_merchant_data(details.merchant_data());
    payment.add_transactions(transaction.data(), transaction.size());

    // Create a new refund address, or re-use:
    QString account = tr("Refund from %1").arg(recipient.authenticatedMerchant);
    std::string strAccount = account.toStdString();
    set<CTxDestination> refundAddresses = wallet->GetAccountAddresses(strAccount);
    if (!refundAddresses.empty()) {
        CScript s; s.SetDestination(*refundAddresses.begin());
        payments::Output* refund_to = payment.add_refund_to();
        refund_to->set_script(&s[0], s.size());
    }
    else {
        CPubKey newKey;
        if (wallet->GetKeyFromPool(newKey)) {
            CKeyID keyID = newKey.GetID();
            wallet->SetAddressBook(keyID, strAccount, "refund");

            CScript s; s.SetDestination(keyID);
            payments::Output* refund_to = payment.add_refund_to();
            refund_to->set_script(&s[0], s.size());
        }
        else {
            // This should never happen, because sending coins should have just unlocked the wallet
            // and refilled the keypool
            qDebug() << "PaymentServer::fetchPaymentACK : Error getting refund key, refund_to not set";
        }
    }

    int length = payment.ByteSize();
    netRequest.setHeader(QNetworkRequest::ContentLengthHeader, length);
    QByteArray serData(length, '\0');
    if (payment.SerializeToArray(serData.data(), length)) {
        netManager->post(netRequest, serData);
    }
    else {
        // This should never happen, either:
        qDebug() << "PaymentServer::fetchPaymentACK : Error serializing payment message";
    }
}

void PaymentServer::netRequestFinished(QNetworkReply* reply)
{
    reply->deleteLater();
    if (reply->error() != QNetworkReply::NoError)
    {
        QString msg = tr("Error communicating with %1: %2")
            .arg(reply->request().url().toString())
            .arg(reply->errorString());

        qDebug() << "PaymentServer::netRequestFinished : " << msg;
        emit message(tr("Network request error"), msg, CClientUIInterface::MSG_ERROR);
        return;
    }

    QByteArray data = reply->readAll();

    QString requestType = reply->request().attribute(QNetworkRequest::User).toString();
    if (requestType == "PaymentRequest")
    {
        PaymentRequestPlus request;
        SendCoinsRecipient recipient;
        if (request.parse(data) && processPaymentRequest(request, recipient))
            emit receivedPaymentRequest(recipient);
        else
            qDebug() << "PaymentServer::netRequestFinished : Error processing payment request";

        return;
    }
    else if (requestType == "PaymentACK")
    {
        payments::PaymentACK paymentACK;
        if (!paymentACK.ParseFromArray(data.data(), data.size()))
        {
            QString msg = tr("Bad response from server %1")
                .arg(reply->request().url().toString());

            qDebug() << "PaymentServer::netRequestFinished : " << msg;
            emit message(tr("Network request error"), msg, CClientUIInterface::MSG_ERROR);
        }
        else {
            emit receivedPaymentACK(GUIUtil::HtmlEscape(paymentACK.memo()));
        }
    }
}

void PaymentServer::reportSslErrors(QNetworkReply* reply, const QList<QSslError> &errs)
{
    Q_UNUSED(reply);

    QString errString;
    foreach (const QSslError& err, errs) {
        qDebug() << "PaymentServer::reportSslErrors : " << err;
        errString += err.errorString() + "\n";
    }
    emit message(tr("Network request error"), errString, CClientUIInterface::MSG_ERROR);
}

void PaymentServer::setOptionsModel(OptionsModel *optionsModel)
{
    this->optionsModel = optionsModel;
}

void PaymentServer::handlePaymentACK(const QString& paymentACKMsg)
{
    // currently we don't futher process or store the paymentACK message
    emit message(tr("Payment acknowledged"), paymentACKMsg, CClientUIInterface::ICON_INFORMATION | CClientUIInterface::MODAL);
}