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// Copyright (c) 2011-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
//
// Wraps dumb protocol buffer paymentRequest
// with some extra methods
//
#include "paymentrequestplus.h"
#include "util.h"
#include <stdexcept>
#include <openssl/x509_vfy.h>
#include <QDateTime>
#include <QDebug>
#include <QSslCertificate>
class SSLVerifyError : public std::runtime_error
{
public:
explicit SSLVerifyError(std::string err) : std::runtime_error(err) { }
};
bool PaymentRequestPlus::parse(const QByteArray& data)
{
bool parseOK = paymentRequest.ParseFromArray(data.data(), data.size());
if (!parseOK) {
qWarning() << "PaymentRequestPlus::parse: Error parsing payment request";
return false;
}
if (paymentRequest.payment_details_version() > 1) {
qWarning() << "PaymentRequestPlus::parse: Received up-version payment details, version=" << paymentRequest.payment_details_version();
return false;
}
parseOK = details.ParseFromString(paymentRequest.serialized_payment_details());
if (!parseOK)
{
qWarning() << "PaymentRequestPlus::parse: Error parsing payment details";
paymentRequest.Clear();
return false;
}
return true;
}
bool PaymentRequestPlus::SerializeToString(std::string* output) const
{
return paymentRequest.SerializeToString(output);
}
bool PaymentRequestPlus::IsInitialized() const
{
return paymentRequest.IsInitialized();
}
bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) const
{
merchant.clear();
if (!IsInitialized())
return false;
// One day we'll support more PKI types, but just
// x509 for now:
const EVP_MD* digestAlgorithm = nullptr;
if (paymentRequest.pki_type() == "x509+sha256") {
digestAlgorithm = EVP_sha256();
}
else if (paymentRequest.pki_type() == "x509+sha1") {
digestAlgorithm = EVP_sha1();
}
else if (paymentRequest.pki_type() == "none") {
qWarning() << "PaymentRequestPlus::getMerchant: Payment request: pki_type == none";
return false;
}
else {
qWarning() << "PaymentRequestPlus::getMerchant: Payment request: unknown pki_type " << QString::fromStdString(paymentRequest.pki_type());
return false;
}
payments::X509Certificates certChain;
if (!certChain.ParseFromString(paymentRequest.pki_data())) {
qWarning() << "PaymentRequestPlus::getMerchant: Payment request: error parsing pki_data";
return false;
}
std::vector<X509*> certs;
const QDateTime currentTime = QDateTime::currentDateTime();
for (int i = 0; i < certChain.certificate_size(); i++) {
QByteArray certData(certChain.certificate(i).data(), certChain.certificate(i).size());
QSslCertificate qCert(certData, QSsl::Der);
if (currentTime < qCert.effectiveDate() || currentTime > qCert.expiryDate()) {
qWarning() << "PaymentRequestPlus::getMerchant: Payment request: certificate expired or not yet active: " << qCert;
return false;
}
#if QT_VERSION >= 0x050000
if (qCert.isBlacklisted()) {
qWarning() << "PaymentRequestPlus::getMerchant: Payment request: certificate blacklisted: " << qCert;
return false;
}
#endif
const unsigned char *data = (const unsigned char *)certChain.certificate(i).data();
X509 *cert = d2i_X509(nullptr, &data, certChain.certificate(i).size());
if (cert)
certs.push_back(cert);
}
if (certs.empty()) {
qWarning() << "PaymentRequestPlus::getMerchant: Payment request: empty certificate chain";
return false;
}
// The first cert is the signing cert, the rest are untrusted certs that chain
// to a valid root authority. OpenSSL needs them separately.
STACK_OF(X509) *chain = sk_X509_new_null();
for (int i = certs.size() - 1; i > 0; i--) {
sk_X509_push(chain, certs[i]);
}
X509 *signing_cert = certs[0];
// Now create a "store context", which is a single use object for checking,
// load the signing cert into it and verify.
X509_STORE_CTX *store_ctx = X509_STORE_CTX_new();
if (!store_ctx) {
qWarning() << "PaymentRequestPlus::getMerchant: Payment request: error creating X509_STORE_CTX";
return false;
}
char *website = nullptr;
bool fResult = true;
try
{
if (!X509_STORE_CTX_init(store_ctx, certStore, signing_cert, chain))
{
int error = X509_STORE_CTX_get_error(store_ctx);
throw SSLVerifyError(X509_verify_cert_error_string(error));
}
// Now do the verification!
int result = X509_verify_cert(store_ctx);
if (result != 1) {
int error = X509_STORE_CTX_get_error(store_ctx);
// For testing payment requests, we allow self signed root certs!
// This option is just shown in the UI options, if -help-debug is enabled.
if (!(error == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT && gArgs.GetBoolArg("-allowselfsignedrootcertificates", DEFAULT_SELFSIGNED_ROOTCERTS))) {
throw SSLVerifyError(X509_verify_cert_error_string(error));
} else {
qDebug() << "PaymentRequestPlus::getMerchant: Allowing self signed root certificate, because -allowselfsignedrootcertificates is true.";
}
}
X509_NAME *certname = X509_get_subject_name(signing_cert);
// Valid cert; check signature:
payments::PaymentRequest rcopy(paymentRequest); // Copy
rcopy.set_signature(std::string(""));
std::string data_to_verify; // Everything but the signature
rcopy.SerializeToString(&data_to_verify);
#if HAVE_DECL_EVP_MD_CTX_NEW
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
if (!ctx) throw SSLVerifyError("Error allocating OpenSSL context.");
#else
EVP_MD_CTX _ctx;
EVP_MD_CTX *ctx;
ctx = &_ctx;
#endif
EVP_PKEY *pubkey = X509_get_pubkey(signing_cert);
EVP_MD_CTX_init(ctx);
if (!EVP_VerifyInit_ex(ctx, digestAlgorithm, nullptr) ||
!EVP_VerifyUpdate(ctx, data_to_verify.data(), data_to_verify.size()) ||
!EVP_VerifyFinal(ctx, (const unsigned char*)paymentRequest.signature().data(), (unsigned int)paymentRequest.signature().size(), pubkey)) {
throw SSLVerifyError("Bad signature, invalid payment request.");
}
#if HAVE_DECL_EVP_MD_CTX_NEW
EVP_MD_CTX_free(ctx);
#endif
// OpenSSL API for getting human printable strings from certs is baroque.
int textlen = X509_NAME_get_text_by_NID(certname, NID_commonName, nullptr, 0);
website = new char[textlen + 1];
if (X509_NAME_get_text_by_NID(certname, NID_commonName, website, textlen + 1) == textlen && textlen > 0) {
merchant = website;
}
else {
throw SSLVerifyError("Bad certificate, missing common name.");
}
// TODO: detect EV certificates and set merchant = business name instead of unfriendly NID_commonName ?
}
catch (const SSLVerifyError& err) {
fResult = false;
qWarning() << "PaymentRequestPlus::getMerchant: SSL error: " << err.what();
}
if (website)
delete[] website;
X509_STORE_CTX_free(store_ctx);
for (unsigned int i = 0; i < certs.size(); i++)
X509_free(certs[i]);
return fResult;
}
QList<std::pair<CScript,CAmount> > PaymentRequestPlus::getPayTo() const
{
QList<std::pair<CScript,CAmount> > result;
for (int i = 0; i < details.outputs_size(); i++)
{
const unsigned char* scriptStr = (const unsigned char*)details.outputs(i).script().data();
CScript s(scriptStr, scriptStr+details.outputs(i).script().size());
result.append(std::make_pair(s, details.outputs(i).amount()));
}
return result;
}
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