Payment Protocol: X509-validated payment requests

Add support for a Payment Protocol to Bitcoin-Qt.

Payment messages are protocol-buffer encoded and communicated over
http(s), so this adds a dependency on the Google protocol buffer
library, and requires Qt with OpenSSL support.

4 files changed, 466 insertions, 16 deletions

diff --git a/src/qt/test/paymentrequestdata.h b/src/qt/test/paymentrequestdata.h
new file mode 100644
index 0000000000..49558165f0
--- /dev/null
+++ b/src/qt/test/paymentrequestdata.h
@@ -0,0 +1,307 @@
+//
+// Data for paymentservertests.cpp
+//
+
+// Base64/DER-encoded fake certificate authority certificate.
+// Convert pem to base64/der with:
+// cat file.pem | openssl x509 -inform PEM -outform DER | openssl enc -base64
+//
+// Serial Number: 10302349811211485352 (0x8ef94c91b112c0a8)
+// Issuer: CN=PaymentRequest Test CA
+// Subject: CN=PaymentRequest Test CA
+// Not Valid After : Dec  8 16:37:24 2022 GMT
+//
+const char* caCert_BASE64 =
+"\
+MIIB0DCCATmgAwIBAgIJAI75TJGxEsCoMA0GCSqGSIb3DQEBCwUAMCExHzAdBgNV\
+BAMTFlBheW1lbnRSZXF1ZXN0IFRlc3QgQ0EwHhcNMTIxMjEwMTYzNzI0WhcNMjIx\
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+p3waRjPD4bUX3nv+ojz5s4puw7Qq5QUZlhGsMzPvwDGCmZkL\
+";
+
+//
+// This payment request validates directly against the
+// above certificate authority.
+//
+const char* paymentrequest1_BASE64 =
+"\
+Egt4NTA5K3NoYTI1NhrxAwruAzCCAeowggFToAMCAQICAQEwDQYJKoZIhvcNAQEL\
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+SiWVbw0tX/68iSQEGGfh9n6ee/8Myb3ICdw=\
+";
+
+//
+// Signed, but expired, merchant cert in the request
+//
+const char* paymentrequest2_BASE64 =
+"\
+Egt4NTA5K3NoYTI1NhrsAwrpAzCCAeUwggFOoAMCAQICAQMwDQYJKoZIhvcNAQEL\
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+";
+
+//
+// 10-long chain, all intermediates valid
+//
+const char* paymentrequest3_BASE64 =
+"\
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+";
+
+//
+// Long chain, with an invalid (expired) cert in the middle
+//
+const char* paymentrequest4_BASE64 =
+"\
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+";
+
+const char* paymentrequest5_BASE64 =
+"\
+Egt4NTA5K3NoYTI1NhrxAwruAzCCAeowggFToAMCAQICAQEwDQYJKoZIhvcNAQEL\
+BQAwITEfMB0GA1UEAxMWUGF5bWVudFJlcXVlc3QgVGVzdCBDQTAeFw0xMzA0MTkx\
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+XYh860/Q4wvc7lfiTe+dXBzPKAKhMy91yETY\
+";
diff --git a/src/qt/test/paymentservertests.cpp b/src/qt/test/paymentservertests.cpp
new file mode 100644
index 0000000000..2e26ab0c9b
--- /dev/null
+++ b/src/qt/test/paymentservertests.cpp
@@ -0,0 +1,109 @@
+#include <QCoreApplication>
+#include <QDebug>
+#include <QTemporaryFile>
+#include <QVariant>
+
+#include <openssl/x509.h>
+#include <openssl/x509_vfy.h>
+
+#include "optionsmodel.h"
+#include "paymentservertests.h"
+#include "paymentrequestdata.h"
+#include "util.h"
+
+
+
+X509 *parse_b64der_cert(const char* cert_data)
+{
+    std::vector<unsigned char> data = DecodeBase64(cert_data);
+    assert(data.size() > 0);
+    const unsigned char* dptr = &data[0];
+    X509 *cert = d2i_X509(NULL, &dptr, data.size());
+    assert(cert);
+    return cert;
+}
+
+
+//
+// Test payment request handling
+//
+
+static SendCoinsRecipient handleRequest(PaymentServer* server, std::vector<unsigned char>& data)
+{
+    RecipientCatcher sigCatcher;
+    QObject::connect(server, SIGNAL(receivedPaymentRequest(SendCoinsRecipient)),
+                     &sigCatcher, SLOT(getRecipient(SendCoinsRecipient)));
+
+    // Write data to a temp file:
+    QTemporaryFile f;
+    f.open();
+    f.write((const char*)&data[0], data.size());
+    f.close();
+
+    // Create a FileOpenEvent and send it directly to the server's event filter:
+    QFileOpenEvent event(f.fileName());
+    server->eventFilter(NULL, &event);
+
+    QObject::disconnect(server, SIGNAL(receivedPaymentRequest(SendCoinsRecipient)),
+                        &sigCatcher, SLOT(getRecipient(SendCoinsRecipient)));
+
+    // Return results from sigCatcher
+    return sigCatcher.recipient;
+}
+
+void PaymentServerTests::paymentServerTests()
+{
+    OptionsModel optionsModel;
+    PaymentServer* server = new PaymentServer(NULL, false);
+    X509_STORE* caStore = X509_STORE_new();
+    X509_STORE_add_cert(caStore, parse_b64der_cert(caCert_BASE64));
+    PaymentServer::LoadRootCAs(caStore);
+    server->initNetManager(optionsModel);
+    server->uiReady();
+
+    // Now feed PaymentRequests to server, and observe signals it produces:
+    std::vector<unsigned char> data = DecodeBase64(paymentrequest1_BASE64);
+    SendCoinsRecipient r = handleRequest(server, data);
+    QString merchant;
+    r.paymentRequest.getMerchant(caStore, merchant);
+    QCOMPARE(merchant, QString("testmerchant.org"));
+
+    // Version of the above, with an expired certificate:
+    data = DecodeBase64(paymentrequest2_BASE64);
+    r = handleRequest(server, data);
+    r.paymentRequest.getMerchant(caStore, merchant);
+    QCOMPARE(merchant, QString(""));
+
+    // Long certificate chain:
+    data = DecodeBase64(paymentrequest3_BASE64);
+    r = handleRequest(server, data);
+    r.paymentRequest.getMerchant(caStore, merchant);
+    QCOMPARE(merchant, QString("testmerchant8.org"));
+
+    // Long certificate chain, with an expired certificate in the middle:
+    data = DecodeBase64(paymentrequest4_BASE64);
+    r = handleRequest(server, data);
+    r.paymentRequest.getMerchant(caStore, merchant);
+    QCOMPARE(merchant, QString(""));
+
+    // Validly signed, but by a CA not in our root CA list:
+    data = DecodeBase64(paymentrequest5_BASE64);
+    r = handleRequest(server, data);
+    r.paymentRequest.getMerchant(caStore, merchant);
+    QCOMPARE(merchant, QString(""));
+
+    // Try again with no root CA's, verifiedMerchant should be empty:
+    caStore = X509_STORE_new();
+    PaymentServer::LoadRootCAs(caStore);
+    data = DecodeBase64(paymentrequest1_BASE64);
+    r = handleRequest(server, data);
+    r.paymentRequest.getMerchant(caStore, merchant);
+    QCOMPARE(merchant, QString(""));
+
+    delete server;
+}
+
+void RecipientCatcher::getRecipient(SendCoinsRecipient r)
+{
+    recipient = r;
+}
diff --git a/src/qt/test/paymentservertests.h b/src/qt/test/paymentservertests.h
new file mode 100644
index 0000000000..5aa24ebaf2
--- /dev/null
+++ b/src/qt/test/paymentservertests.h
@@ -0,0 +1,29 @@
+#ifndef PAYMENTSERVERTESTS_H
+#define PAYMENTSERVERTESTS_H
+
+#include <QTest>
+#include <QObject>
+
+#include "../paymentserver.h"
+
+class PaymentServerTests : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void paymentServerTests();
+};
+
+// Dummy class to receive paymentserver signals.
+// If SendCoinsRecipient was a proper QObject, then we could use
+// QSignalSpy... but it's not.
+class RecipientCatcher : public QObject
+{
+    Q_OBJECT
+public slots:
+    void getRecipient(SendCoinsRecipient r);
+public:
+    SendCoinsRecipient recipient;
+};
+
+#endif // PAYMENTSERVERTESTS_H
diff --git a/src/qt/test/test_main.cpp b/src/qt/test/test_main.cpp
index af2d358fc4..dae4e60412 100644
--- a/src/qt/test/test_main.cpp
+++ b/src/qt/test/test_main.cpp
@@ -1,16 +1,21 @@
-#include <QTest>

-#include <QObject>

-

-#include "uritests.h"

-

-// This is all you need to run all the tests

-int main(int argc, char *argv[])

-{

-    bool fInvalid = false;

-

-    URITests test1;

-    if (QTest::qExec(&test1) != 0)

-        fInvalid = true;

-

-    return fInvalid;

-}

+#include <QTest>
+#include <QObject>
+
+#include "uritests.h"
+#include "paymentservertests.h"
+
+// This is all you need to run all the tests
+int main(int argc, char *argv[])
+{
+    bool fInvalid = false;
+
+    URITests test1;
+    if (QTest::qExec(&test1) != 0)
+        fInvalid = true;
+
+    PaymentServerTests test2;
+    if (QTest::qExec(&test2) != 0)
+        fInvalid = true;
+
+    return fInvalid;
+}