transmission/libtransmission/crypto-utils-openssl.cc

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// This file Copyright © 2007-2023 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
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#ifdef __APPLE__
/* OpenSSL "deprecated" as of OS X 10.7, but we still use it */
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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#endif
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#include <memory>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/opensslv.h>
#include <openssl/rand.h>
#include <openssl/ssl.h>
#include <openssl/x509.h>
#include <fmt/core.h>
#include "transmission.h"
#include "crypto-utils.h"
#include "log.h"
#include "tr-assert.h"
#include "utils.h"
namespace
{
void log_openssl_error(char const* file, int line)
{
unsigned long const error_code = ERR_get_error();
if (tr_logLevelIsActive(TR_LOG_ERROR))
{
if (static bool strings_loaded = false; !strings_loaded)
{
#if OPENSSL_VERSION_NUMBER < 0x10100000 || (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x20700000)
ERR_load_crypto_strings();
#else
OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, nullptr);
#endif
strings_loaded = true;
}
auto buf = std::array<char, 512>{};
ERR_error_string_n(error_code, std::data(buf), std::size(buf));
tr_logAddMessage(
file,
line,
TR_LOG_ERROR,
fmt::format(
_("{crypto_library} error: {error} ({error_code})"),
fmt::arg("crypto_library", "OpenSSL"),
fmt::arg("error", std::data(buf)),
fmt::arg("error_code", error_code)));
}
}
#define log_error() log_openssl_error(__FILE__, __LINE__)
bool check_openssl_result(int result, int expected_result, bool expected_equal, char const* file, int line)
{
bool const ret = (result == expected_result) == expected_equal;
if (!ret)
{
log_openssl_error(file, line);
}
return ret;
}
#define check_result(result) check_openssl_result((result), 1, true, __FILE__, __LINE__)
namespace sha_helpers
{
class ShaHelper
{
public:
using EvpFunc = decltype((EVP_sha1));
explicit ShaHelper(EvpFunc evp_func)
: evp_func_{ evp_func }
{
clear();
}
void clear() const
{
EVP_DigestInit_ex(handle_.get(), evp_func_(), nullptr);
}
void update(void const* data, size_t data_length) const
{
if (data_length != 0U)
{
EVP_DigestUpdate(handle_.get(), data, data_length);
}
}
template<typename DigestType>
[[nodiscard]] DigestType digest()
{
TR_ASSERT(handle_ != nullptr);
unsigned int hash_length = 0;
auto digest = DigestType{};
auto* const digest_as_uchar = reinterpret_cast<unsigned char*>(std::data(digest));
[[maybe_unused]] bool const ok = check_result(EVP_DigestFinal_ex(handle_.get(), digest_as_uchar, &hash_length));
TR_ASSERT(!ok || hash_length == std::size(digest));
clear();
return digest;
}
private:
struct MessageDigestDeleter
{
void operator()(EVP_MD_CTX* ctx) const noexcept
{
EVP_MD_CTX_destroy(ctx);
}
};
EvpFunc evp_func_;
std::unique_ptr<EVP_MD_CTX, MessageDigestDeleter> const handle_{ EVP_MD_CTX_create() };
};
class Sha1Impl final : public tr_sha1
{
public:
Sha1Impl() = default;
Sha1Impl(Sha1Impl&&) = delete;
Sha1Impl(Sha1Impl const&) = delete;
~Sha1Impl() override = default;
Sha1Impl& operator=(Sha1Impl&&) = delete;
Sha1Impl& operator=(Sha1Impl const&) = delete;
void clear() override
{
helper_.clear();
}
void add(void const* data, size_t data_length) override
{
helper_.update(data, data_length);
}
[[nodiscard]] tr_sha1_digest_t finish() override
{
return helper_.digest<tr_sha1_digest_t>();
}
private:
ShaHelper helper_{ EVP_sha1 };
};
class Sha256Impl final : public tr_sha256
{
public:
Sha256Impl() = default;
Sha256Impl(Sha256Impl&&) = delete;
Sha256Impl(Sha256Impl const&) = delete;
~Sha256Impl() override = default;
Sha256Impl& operator=(Sha256Impl&&) = delete;
Sha256Impl& operator=(Sha256Impl const&) = delete;
void clear() override
{
helper_.clear();
}
void add(void const* data, size_t data_length) override
{
helper_.update(data, data_length);
}
[[nodiscard]] tr_sha256_digest_t finish() override
{
return helper_.digest<tr_sha256_digest_t>();
}
private:
ShaHelper helper_{ EVP_sha256 };
};
} // namespace sha_helpers
} // namespace
// --- sha
std::unique_ptr<tr_sha1> tr_sha1::create()
{
using namespace sha_helpers;
return std::make_unique<Sha1Impl>();
}
std::unique_ptr<tr_sha256> tr_sha256::create()
{
using namespace sha_helpers;
return std::make_unique<Sha256Impl>();
}
// --- x509
tr_x509_store_t tr_ssl_get_x509_store(tr_ssl_ctx_t handle)
{
if (handle == nullptr)
{
return nullptr;
}
return SSL_CTX_get_cert_store(static_cast<SSL_CTX const*>(handle));
}
bool tr_x509_store_add(tr_x509_store_t handle, tr_x509_cert_t cert)
{
TR_ASSERT(handle != nullptr);
TR_ASSERT(cert != nullptr);
return check_result(X509_STORE_add_cert(static_cast<X509_STORE*>(handle), static_cast<X509*>(cert)));
}
tr_x509_cert_t tr_x509_cert_new(void const* der, size_t der_length)
{
TR_ASSERT(der != nullptr);
X509* const ret = d2i_X509(nullptr, reinterpret_cast<unsigned char const**>(&der), der_length);
if (ret == nullptr)
{
log_error();
}
return ret;
}
void tr_x509_cert_free(tr_x509_cert_t handle)
{
if (handle == nullptr)
{
return;
}
X509_free(static_cast<X509*>(handle));
}
// --- rand
bool tr_rand_buffer_crypto(void* buffer, size_t length)
{
if (length == 0)
{
return true;
}
TR_ASSERT(buffer != nullptr);
return check_result(RAND_bytes(static_cast<unsigned char*>(buffer), (int)length));
}