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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
#include <QScopedPointer>
#include "exception.h"
#include "cryptography.h"
#include "libcryptofunction.h"
#include "signature_p.h"
QT_BEGIN_NAMESPACE_AM
// clazy:excludeall=non-pod-global-static
// AXIVION DISABLE Qt-NonPodGlobalStatic
// dummy structures
struct BIO;
struct BIO_METHOD;
struct PKCS7;
struct PKCS12;
struct EVP_PKEY;
struct EVP_CIPHER;
struct X509;
struct X509_STORE;
struct STACK_OF_X509;
struct i2d_of_void;
struct d2i_of_void;
typedef int pem_password_cb (char *, int, int, void *);
// deleter
static QT_AM_LIBCRYPTO_FUNCTION(X509_free, void(*)(X509 *));
static QT_AM_LIBCRYPTO_FUNCTION(BIO_free, int(*)(BIO *), 0);
static QT_AM_LIBCRYPTO_FUNCTION(PKCS7_free, void(*)(PKCS7 *));
static QT_AM_LIBCRYPTO_FUNCTION(EVP_PKEY_free, void(*)(EVP_PKEY *));
static QT_AM_LIBCRYPTO_FUNCTION(PKCS12_free, void(*)(PKCS12 *));
static QT_AM_LIBCRYPTO_FUNCTION(X509_STORE_free, void(*)(X509_STORE *));
static QT_AM_LIBCRYPTO_FUNCTION(sk_pop_free, void(*)(STACK_OF_X509 *, void(*)(void *))); // 1.0
static QT_AM_LIBCRYPTO_FUNCTION(OPENSSL_sk_pop_free, void(*)(STACK_OF_X509 *, void(*)(void *))); // 1.1
// error handling
static QT_AM_LIBCRYPTO_FUNCTION(ERR_get_error, unsigned long(*)(), 4|64 /*ERR_R_INTERNAL_ERROR*/);
// create
static QT_AM_LIBCRYPTO_FUNCTION(BIO_ctrl, long(*)(BIO *, int, long, void *), 0);
static QT_AM_LIBCRYPTO_FUNCTION(d2i_PKCS12_bio, PKCS12 *(*)(BIO *, PKCS12 **), nullptr);
static QT_AM_LIBCRYPTO_FUNCTION(PKCS12_parse, int (*)(PKCS12 *, const char *, EVP_PKEY **, X509 **, STACK_OF_X509 **ca), 0);
static QT_AM_LIBCRYPTO_FUNCTION(PKCS7_sign, PKCS7 *(*)(X509 *, EVP_PKEY *, STACK_OF_X509 *, BIO *, int), nullptr);
static QT_AM_LIBCRYPTO_FUNCTION(BIO_new, BIO *(*)(BIO_METHOD *), nullptr);
static QT_AM_LIBCRYPTO_FUNCTION(BIO_s_mem, BIO_METHOD *(*)(), nullptr);
static QT_AM_LIBCRYPTO_FUNCTION(PEM_ASN1_write_bio, int (*)(i2d_of_void *, const char *, BIO *, void *, const EVP_CIPHER *, unsigned char *, int, pem_password_cb *, void *), 0);
static QT_AM_LIBCRYPTO_FUNCTION(i2d_PKCS7_bio, int (*)(BIO *, PKCS7 *), 0);
static QT_AM_LIBCRYPTO_FUNCTION(d2i_PKCS7_bio, PKCS7 *(*)(BIO *, PKCS7 **), nullptr);
// verify
static QT_AM_LIBCRYPTO_FUNCTION(BIO_new_mem_buf, BIO *(*)(const void *, int), nullptr);
static QT_AM_LIBCRYPTO_FUNCTION(PEM_ASN1_read_bio, void *(*)(d2i_of_void *, const char *, BIO *, void **, pem_password_cb *, void *), nullptr);
static QT_AM_LIBCRYPTO_FUNCTION(d2i_X509, X509 *(*)(X509 **, const unsigned char **, long), nullptr); // 1.0
static QT_AM_LIBCRYPTO_FUNCTION(d2i_X509_AUX, X509 *(*)(X509 **, const unsigned char **, long), nullptr); // 1.1
static QT_AM_LIBCRYPTO_FUNCTION(X509_STORE_new, X509_STORE *(*)(), nullptr);
static QT_AM_LIBCRYPTO_FUNCTION(X509_STORE_add_cert, int (*)(X509_STORE *, X509 *), 0);
static QT_AM_LIBCRYPTO_FUNCTION(PKCS7_verify, int (*)(PKCS7 *, STACK_OF_X509 *, X509_STORE *, BIO *, BIO *, int), 0);
struct OpenSslDeleter {
static inline void cleanup(X509 *x509)
{ am_X509_free(x509); }
static inline void cleanup(BIO *bio)
{ am_BIO_free(bio); }
static inline void cleanup(PKCS7 *pkcs7)
{ am_PKCS7_free(pkcs7); }
static inline void cleanup(EVP_PKEY *pkey)
{ am_EVP_PKEY_free(pkey); }
static inline void cleanup(PKCS12 *pkcs12)
{ am_PKCS12_free(pkcs12); }
static inline void cleanup(X509_STORE *x509Store)
{ am_X509_STORE_free(x509Store); }
static inline void cleanup(STACK_OF_X509 *stackOfX509)
{ (Cryptography::LibCryptoFunctionBase::isOpenSSL11() ? am_OPENSSL_sk_pop_free
: am_sk_pop_free)
(stackOfX509, reinterpret_cast<void(*)(void *)>(am_X509_free.functionPointer())); }
};
template <typename T> using OpenSslPointer = QScopedPointer<T, OpenSslDeleter>;
class OpenSslException : public Exception // clazy:exclude=copyable-polymorphic
{
public:
OpenSslException(const char *errorString)
: Exception(Error::Cryptography)
{
m_errorString = Cryptography::errorString(static_cast<qint64>(am_ERR_get_error()), errorString);
}
};
QByteArray SignaturePrivate::create(const QByteArray &signingCertificatePkcs12,
const QByteArray &signingCertificatePassword) noexcept(false)
{
OpenSslPointer<BIO> bioPkcs12(am_BIO_new_mem_buf(signingCertificatePkcs12.constData(), signingCertificatePkcs12.size()));
if (!bioPkcs12)
throw OpenSslException("Could not create BIO buffer for PKCS#12 data");
//PKCS12 *d2i_PKCS12_bio(BIO *bp, PKCS12 **p12);
OpenSslPointer<PKCS12> pkcs12(am_d2i_PKCS12_bio(bioPkcs12.get(), nullptr));
if (!pkcs12)
throw OpenSslException("Could not read PKCS#12 data from BIO buffer");
//int PKCS12_parse(PKCS12 *p12, const char *pass, EVP_PKEY **pkey, X509 **cert, STACK_OF(X509) **ca);
EVP_PKEY *tempSignKey = nullptr;
X509 *tempSignCert = nullptr;
STACK_OF_X509 *tempCaCerts = nullptr;
int parseOk = am_PKCS12_parse(pkcs12.get(), signingCertificatePassword.constData(), &tempSignKey, &tempSignCert, &tempCaCerts);
OpenSslPointer<EVP_PKEY> signKey(tempSignKey);
OpenSslPointer<X509> signCert(tempSignCert);
OpenSslPointer<STACK_OF_X509> caCerts(tempCaCerts);
if (!parseOk)
throw OpenSslException("Could not parse PKCS#12 data");
if (!signKey)
throw OpenSslException("Could not find the private key within the PKCS#12 data");
if (!signCert)
throw OpenSslException("Could not find the certificate within the PKCS#12 data");
OpenSslPointer<BIO> bioHash(am_BIO_new_mem_buf(hash.constData(), hash.size()));
if (!bioHash)
throw OpenSslException("Could not create a BIO buffer for the hash");
//PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, BIO *data, int flags);
OpenSslPointer<PKCS7> signature(am_PKCS7_sign(signCert.get(), signKey.get(), caCerts.get(),
bioHash.get(), 0x40 /*PKCS7_DETACHED*/));
if (!signature)
throw OpenSslException("Could not create the PKCS#7 signature");
OpenSslPointer<BIO> bioSignature(am_BIO_new(am_BIO_s_mem()));
if (!bioSignature)
throw OpenSslException("Could not create a BIO buffer for the PKCS#7 signature");
// int PEM_write_bio_PKCS7(BIO *bp, PKCS7 *x);
//if (!am_PEM_ASN1_write_bio((i2d_of_void *) am_i2d_PKCS7.functionPointer(), PEM_STRING_PKCS7, bioSignature.get(), signature.get(), nullptr, nullptr, 0, nullptr, nullptr))
if (!am_i2d_PKCS7_bio(bioSignature.get(), signature.get()))
throw OpenSslException("Could not write the PKCS#7 signature to the BIO buffer");
char *data = nullptr;
// long size = BIO_get_mem_data(bioSignature.get(), &data);
int size = static_cast<int>(am_BIO_ctrl(bioSignature.get(), 3 /*BIO_CTRL_INFO*/, 0, reinterpret_cast<char *>(&data)));
if (size <= 0 || !data)
throw OpenSslException("The BIO buffer for the PKCS#7 signature is invalid");
return QByteArray(data, size);
}
bool SignaturePrivate::verify(const QByteArray &signaturePkcs7,
const QByteArrayList &chainOfTrust) noexcept(false)
{
OpenSslPointer<BIO> bioSignature(am_BIO_new_mem_buf(signaturePkcs7.constData(), signaturePkcs7.size()));
if (!bioSignature)
throw OpenSslException("Could not create BIO buffer for PKCS#7 data");
// PKCS7 *PEM_read_bio_PKCS7(BIO *bp, PKCS7 **x, pem_password_cb *cb, void *u);
//OpenSslPointer<PKCS7> signature((PKCS7 *) am_PEM_ASN1_read_bio((d2i_of_void *) am_d2i_PKCS7.functionPointer(), PEM_STRING_PKCS7, bioSignature.get(), nullptr, nullptr, nullptr));
OpenSslPointer<PKCS7> signature(am_d2i_PKCS7_bio(bioSignature.get(), nullptr));
if (!signature)
throw OpenSslException("Could not read PKCS#7 data from BIO buffer");
OpenSslPointer<BIO> bioHash(am_BIO_new_mem_buf(hash.constData(), hash.size()));
if (!bioHash)
throw OpenSslException("Could not create BIO buffer for the hash");
OpenSslPointer<X509_STORE> certChain(am_X509_STORE_new());
if (!certChain)
throw OpenSslException("Could not create a X509 certificate store");
for (const QByteArray &trustedCert : chainOfTrust) {
OpenSslPointer<BIO> bioCert(am_BIO_new_mem_buf(trustedCert.constData(), trustedCert.size()));
if (!bioCert)
throw OpenSslException("Could not create BIO buffer for a certificate");
// BIO_eof(b) == (int)BIO_ctrl(b,BIO_CTRL_EOF,0,NULL)
while (!am_BIO_ctrl(bioCert.get(), 2 /*BIO_CTRL_EOF*/, 0, nullptr)) {
//OpenSslPointer<X509> cert(PEM_read_bio_X509(bioCert.get(), 0, 0, 0));
OpenSslPointer<X509> cert(static_cast<X509 *>(am_PEM_ASN1_read_bio(reinterpret_cast<d2i_of_void *>((Cryptography::LibCryptoFunctionBase::isOpenSSL11() ? am_d2i_X509_AUX : am_d2i_X509).functionPointer()),
"CERTIFICATE" /*PEM_STRING_X509*/, bioCert.get(),
nullptr, nullptr, nullptr)));
if (!cert)
throw OpenSslException("Could not load a certificate from the chain of trust");
if (!am_X509_STORE_add_cert(certChain.get(), cert.get()))
throw OpenSslException("Could not add a certificate from the chain of trust to the certificate store");
// X509 certs are ref-counted, so we need to "free" the one we got via PEM_read_bio
}
}
// int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store, BIO *indata, BIO *out, int flags);
if (am_PKCS7_verify(signature.get(), nullptr, certChain.get(), bioHash.get(), nullptr, 0x8 /*PKCS7_NOCHAIN*/) != 1) {
bool failed = (am_ERR_get_error() != 0);
if (failed)
throw OpenSslException("Failed to verify signature");
return false;
} else {
return true;
}
}
QT_END_NAMESPACE_AM
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