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// Copyright (C) 2021 The Qt Company Ltd.
// Copyright (C) 2019 Luxoft Sweden AB
// Copyright (C) 2018 Pelagicore AG
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
// Qt-Security score:critical reason:cryptography
#ifdef _WIN32
// needed for crypto API compatibility - otherwise this will only work on Win8+
# undef WINVER
# define WINVER _WIN32_WINNT_WIN7
# undef _WIN32_WINNT
# define _WIN32_WINNT _WIN32_WINNT_WIN7
#endif
#include "exception.h"
#include "cryptography.h"
#include "signature_p.h"
#include <windows.h>
#include <wincrypt.h>
QT_BEGIN_NAMESPACE_AM
class WinCryptException : public Exception
{
public:
WinCryptException(const char *errorString)
: Exception(Error::Cryptography)
{
m_errorString = Cryptography::errorString(GetLastError(), errorString);
}
};
QByteArray SignaturePrivate::create(const QByteArray &signingCertificatePkcs12,
const QByteArray &signingCertificatePassword) noexcept(false)
{
HCERTSTORE certStore = nullptr;
auto cleanup = [=]() {
if (certStore)
CertCloseStore(certStore, CERT_CLOSE_STORE_FORCE_FLAG);
};
try {
// Although WinCrypt could, the macOS Security Framework cannot process empty detached data
if (hash.isEmpty())
throw WinCryptException("cannot sign an empty hash value");
CRYPT_DATA_BLOB pkcs12Blob;
pkcs12Blob.cbData = signingCertificatePkcs12.size();
pkcs12Blob.pbData = (BYTE *) signingCertificatePkcs12.constData();
QString password = QString::fromUtf8(signingCertificatePassword);
certStore = PFXImportCertStore(&pkcs12Blob,
reinterpret_cast<const wchar_t *>(password.utf16()),
PKCS12_NO_PERSIST_KEY);
if (!certStore)
throw WinCryptException("could not read or not parse PKCS#12 certificate");
QVector<PCCERT_CONTEXT> signCerts;
QVector<PCCERT_CONTEXT> allCerts;
PCCERT_CONTEXT cert = nullptr;
while ((cert = CertEnumCertificatesInStore(certStore, cert))) {
BYTE keyUsage = 0;
if (!CertGetIntendedKeyUsage(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, cert->pCertInfo,
&keyUsage, sizeof(keyUsage))
|| !(keyUsage & CERT_KEY_CERT_SIGN_KEY_USAGE)) {
signCerts << cert;
}
allCerts << cert;
}
CertFreeCertificateContext(cert);
if (signCerts.size() != 1)
throw WinCryptException("PKCS#12 key did not contain exactly 1 signing certificate");
CRYPT_SIGN_MESSAGE_PARA cmsParams;
memset(&cmsParams, 0, sizeof(cmsParams));
cmsParams.cbSize = sizeof(cmsParams);
cmsParams.dwMsgEncodingType = X509_ASN_ENCODING | PKCS_7_ASN_ENCODING;
cmsParams.pSigningCert = signCerts.first();
cmsParams.HashAlgorithm.pszObjId = (LPSTR) szOID_OIWSEC_sha1;
cmsParams.cMsgCert = allCerts.size();
cmsParams.rgpMsgCert = allCerts.data();
cmsParams.dwFlags = CRYPT_MESSAGE_SILENT_KEYSET_FLAG;
const BYTE *inData[] = { (const BYTE *) hash.constData() };
DWORD inSize[] = { (DWORD) hash.size() };
DWORD outSize = 0;
if (!CryptSignMessage(&cmsParams, true, 1, inData, inSize, nullptr, &outSize))
throw WinCryptException("could not calculate size of signed message");
QByteArray result;
result.resize(outSize);
if (!CryptSignMessage(&cmsParams, true, 1, inData, inSize, (BYTE *) result.data(), &outSize))
throw WinCryptException("could not sign message");
result.resize(outSize);
cleanup();
return result;
} catch (const Exception &) {
cleanup();
throw;
}
}
bool SignaturePrivate::verify(const QByteArray &signaturePkcs7,
const QByteArrayList &chainOfTrust) noexcept(false)
{
PCCERT_CONTEXT signerCert = nullptr;
HCERTSTORE msgCertStore = nullptr;
HCERTSTORE rootCertStore = nullptr;
HCERTCHAINENGINE certChainEngine = nullptr;
PCCERT_CHAIN_CONTEXT chainContext = nullptr;
auto cleanup = [=]() {
if (chainContext)
CertFreeCertificateChain(chainContext);
if (certChainEngine)
CertFreeCertificateChainEngine(certChainEngine);
if (rootCertStore)
CertCloseStore(rootCertStore, CERT_CLOSE_STORE_FORCE_FLAG);
if (msgCertStore)
CertCloseStore(msgCertStore, CERT_CLOSE_STORE_FORCE_FLAG);
if (signerCert)
CertFreeCertificateContext(signerCert);
};
try {
CRYPT_VERIFY_MESSAGE_PARA cmsParams;
memset(&cmsParams, 0, sizeof(cmsParams));
cmsParams.cbSize = sizeof(cmsParams);
cmsParams.dwMsgAndCertEncodingType = X509_ASN_ENCODING | PKCS_7_ASN_ENCODING;
cmsParams.hCryptProv = 0;
cmsParams.pfnGetSignerCertificate = nullptr;
cmsParams.pvGetArg = nullptr;
const BYTE *inData[] = { (const BYTE *) hash.constData() };
DWORD inSize[] = { (DWORD) hash.size() };
if (!CryptVerifyDetachedMessageSignature(&cmsParams, 0,
(const BYTE *) signaturePkcs7.constData(),
signaturePkcs7.size(),
1, inData, inSize, &signerCert)) {
throw WinCryptException("Could not read PKCS#7 data");
}
if (!signerCert)
throw WinCryptException("Could not verify signature: no signer certificate");
msgCertStore = CryptGetMessageCertificates(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0, 0,
(const BYTE *) signaturePkcs7.constData(),
signaturePkcs7.size());
if (!msgCertStore)
throw WinCryptException("Could not retrieve certificates from signature");
rootCertStore = CertOpenStore(CERT_STORE_PROV_MEMORY, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
0, 0, nullptr);
if (!rootCertStore)
throw WinCryptException("Could not create temporary root certificate store");
for (const QByteArray &trustedCert : chainOfTrust) {
// convert from PEM to DER
DWORD derSize = 0;
if (!CryptStringToBinaryA(trustedCert.constData(), trustedCert.size(), CRYPT_STRING_BASE64HEADER,
nullptr, &derSize, nullptr, nullptr)) {
throw WinCryptException("Could not load a certificate from the chain of trust (PEM to DER size calculation failed)");
}
QByteArray derBuffer;
derBuffer.resize(derSize);
if (!CryptStringToBinaryA(trustedCert.constData(), trustedCert.size(), CRYPT_STRING_BASE64HEADER,
(BYTE *) derBuffer.data(), &derSize, nullptr, nullptr)) {
throw WinCryptException("Could not load a certificate from the chain of trust (PEM to DER conversion failed)");
}
derBuffer.resize(derSize);
if (!CertAddEncodedCertificateToStore(rootCertStore, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
(const BYTE *) derBuffer.constData(), derBuffer.size(),
CERT_STORE_ADD_ALWAYS, nullptr)) {
throw WinCryptException("Could not add a certificate from the chain of trust to the certificate store");
}
}
CERT_CHAIN_ENGINE_CONFIG chainConfig;
memset(&chainConfig, 0, sizeof(chainConfig));
chainConfig.cbSize = sizeof(chainConfig);
chainConfig.hExclusiveRoot = rootCertStore;
if (!CertCreateCertificateChainEngine(&chainConfig, &certChainEngine))
throw WinCryptException("Could not create certificate chain");
CERT_CHAIN_PARA chainParams;
memset(&chainParams, 0, sizeof(chainParams));
chainParams.cbSize = sizeof(chainParams);
if (!CertGetCertificateChain(certChainEngine, signerCert, nullptr, msgCertStore,
&chainParams, 0, nullptr, &chainContext)) {
throw WinCryptException("Could not verify certificate chain");
}
if (chainContext->TrustStatus.dwErrorStatus != CERT_TRUST_NO_ERROR) {
throw Exception("Failed to verify signature (error: 0x%1, info: 0x%2")
.arg(chainContext->TrustStatus.dwErrorStatus, 8, 16, QChar(u'0'))
.arg(chainContext->TrustStatus.dwInfoStatus, 8, 16, QChar(u'0'));
}
cleanup();
return true;
} catch (const Exception &) {
cleanup();
throw;
}
}
QT_END_NAMESPACE_AM
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