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transmission/libtransmission/crypto-utils-polarssl.cc

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// This file Copyright © 2014-2022 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.
#include <mutex>
#if defined(POLARSSL_IS_MBEDTLS)
#define API_HEADER(x) <mbedtls/x>
#define API(x) mbedtls_##x
#define API_VERSION_NUMBER MBEDTLS_VERSION_NUMBER
#else
#define API_HEADER(x) <polarssl/x>
#define API(x) x
#define API_VERSION_NUMBER POLARSSL_VERSION_NUMBER
#endif
#include API_HEADER(base64.h)
#include API_HEADER(ctr_drbg.h)
#include API_HEADER(dhm.h)
#include API_HEADER(error.h)
#include API_HEADER(sha1.h)
#include API_HEADER(sha256.h)
#include API_HEADER(version.h)
#include <fmt/core.h>
#include "transmission.h"
#include "crypto-utils.h"
#include "log.h"
#include "tr-assert.h"
#include "utils.h"
#define TR_CRYPTO_DH_SECRET_FALLBACK
#define TR_CRYPTO_X509_FALLBACK
#include "crypto-utils-fallback.cc" // NOLINT(bugprone-suspicious-include)
/***
****
***/
using api_ctr_drbg_context = API(ctr_drbg_context);
using api_sha1_context = API(sha1_context);
using api_sha256_context = API(sha256_context);
using api_dhm_context = API(dhm_context);
static void log_polarssl_error(int error_code, char const* file, int line)
{
if (tr_logLevelIsActive(TR_LOG_ERROR))
{
char error_message[256];
#if defined(POLARSSL_IS_MBEDTLS)
mbedtls_strerror(error_code, error_message, sizeof(error_message));
#elif API_VERSION_NUMBER >= 0x01030000
polarssl_strerror(error_code, error_message, sizeof(error_message));
#else
error_strerror(error_code, error_message, sizeof(error_message));
#endif
tr_logAddMessage(
file,
line,
TR_LOG_ERROR,
fmt::format(
_("{crypto_library} error: {error} ({error_code})"),
fmt::arg("crypto_library", "PolarSSL/MbedTLS"),
fmt::arg("error", error_message),
fmt::arg("error_code", error_code)));
}
}
#define log_error(error_code) log_polarssl_error((error_code), __FILE__, __LINE__)
static bool check_polarssl_result(int result, int expected_result, char const* file, int line)
{
bool const ret = result == expected_result;
if (!ret)
{
log_polarssl_error(result, file, line);
}
return ret;
}
#define check_result(result) check_polarssl_result((result), 0, __FILE__, __LINE__)
#define check_result_eq(result, x_result) check_polarssl_result((result), (x_result), __FILE__, __LINE__)
/***
****
***/
static int my_rand(void* /*context*/, unsigned char* buffer, size_t buffer_size)
{
for (size_t i = 0; i < buffer_size; ++i)
{
buffer[i] = tr_rand_int_weak(256);
}
return 0;
}
static api_ctr_drbg_context* get_rng(void)
{
static api_ctr_drbg_context rng;
static bool rng_initialized = false;
if (!rng_initialized)
{
#if API_VERSION_NUMBER >= 0x02000000
API(ctr_drbg_init)(&rng);
if (!check_result(API(ctr_drbg_seed)(&rng, &my_rand, nullptr, nullptr, 0)))
#else
if (!check_result(API(ctr_drbg_init)(&rng, &my_rand, nullptr, nullptr, 0)))
#endif
{
return nullptr;
}
rng_initialized = true;
}
return &rng;
}
static std::recursive_mutex rng_mutex_;
/***
****
***/
tr_sha1_ctx_t tr_sha1_init(void)
{
api_sha1_context* handle = tr_new0(api_sha1_context, 1);
#if API_VERSION_NUMBER >= 0x01030800
API(sha1_init)(handle);
#endif
API(sha1_starts)(handle);
return handle;
}
bool tr_sha1_update(tr_sha1_ctx_t raw_handle, void const* data, size_t data_length)
{
auto* handle = static_cast<api_sha1_context*>(raw_handle);
TR_ASSERT(handle != nullptr);
if (data_length == 0)
{
return true;
}
TR_ASSERT(data != nullptr);
API(sha1_update)(handle, static_cast<unsigned char const*>(data), data_length);
return true;
}
std::optional<tr_sha1_digest_t> tr_sha1_final(tr_sha1_ctx_t raw_handle)
{
auto* handle = static_cast<api_sha1_context*>(raw_handle);
TR_ASSERT(handle != nullptr);
auto digest = tr_sha1_digest_t{};
auto* const digest_as_uchar = reinterpret_cast<unsigned char*>(std::data(digest));
API(sha1_finish)(handle, digest_as_uchar);
#if API_VERSION_NUMBER >= 0x01030800
API(sha1_free)(handle);
#endif
tr_free(handle);
return digest;
}
/***
****
***/
tr_sha256_ctx_t tr_sha256_init(void)
{
api_sha256_context* handle = tr_new0(api_sha256_context, 1);
#if API_VERSION_NUMBER >= 0x01030800
API(sha256_init)(handle);
#endif
API(sha256_starts)(handle, 0);
return handle;
}
bool tr_sha256_update(tr_sha256_ctx_t raw_handle, void const* data, size_t data_length)
{
auto* handle = static_cast<api_sha256_context*>(raw_handle);
TR_ASSERT(handle != nullptr);
if (data_length == 0)
{
return true;
}
TR_ASSERT(data != nullptr);
API(sha256_update)(handle, static_cast<unsigned char const*>(data), data_length);
return true;
}
std::optional<tr_sha256_digest_t> tr_sha256_final(tr_sha256_ctx_t raw_handle)
{
auto* handle = static_cast<api_sha256_context*>(raw_handle);
TR_ASSERT(handle != nullptr);
auto digest = tr_sha256_digest_t{};
auto* const digest_as_uchar = reinterpret_cast<unsigned char*>(std::data(digest));
API(sha256_finish)(handle, digest_as_uchar);
#if API_VERSION_NUMBER >= 0x01030800
API(sha256_free)(handle);
#endif
tr_free(handle);
return digest;
}
/***
****
***/
tr_dh_ctx_t tr_dh_new(
uint8_t const* prime_num,
size_t prime_num_length,
uint8_t const* generator_num,
size_t generator_num_length)
{
TR_ASSERT(prime_num != nullptr);
TR_ASSERT(generator_num != nullptr);
api_dhm_context* handle = tr_new0(api_dhm_context, 1);
#if API_VERSION_NUMBER >= 0x01030800
API(dhm_init)(handle);
#endif
if (!check_result(API(mpi_read_binary)(&handle->P, prime_num, prime_num_length)) ||
!check_result(API(mpi_read_binary)(&handle->G, generator_num, generator_num_length)))
{
API(dhm_free)(handle);
return nullptr;
}
handle->len = prime_num_length;
return handle;
}
void tr_dh_free(tr_dh_ctx_t raw_handle)
{
auto* handle = static_cast<api_dhm_context*>(raw_handle);
if (handle == nullptr)
{
return;
}
API(dhm_free)(handle);
}
bool tr_dh_make_key(tr_dh_ctx_t raw_handle, size_t private_key_length, uint8_t* public_key, size_t* public_key_length)
{
TR_ASSERT(raw_handle != nullptr);
TR_ASSERT(public_key != nullptr);
auto* handle = static_cast<api_dhm_context*>(raw_handle);
if (public_key_length != nullptr)
{
*public_key_length = handle->len;
}
return check_result(API(dhm_make_public)(handle, private_key_length, public_key, handle->len, my_rand, nullptr));
}
tr_dh_secret_t tr_dh_agree(tr_dh_ctx_t raw_handle, uint8_t const* other_public_key, size_t other_public_key_length)
{
TR_ASSERT(raw_handle != nullptr);
TR_ASSERT(other_public_key != nullptr);
auto* handle = static_cast<api_dhm_context*>(raw_handle);
if (!check_result(API(dhm_read_public)(handle, other_public_key, other_public_key_length)))
{
return nullptr;
}
tr_dh_secret* const ret = tr_dh_secret_new(handle->len);
size_t secret_key_length = handle->len;
#if API_VERSION_NUMBER >= 0x02000000
if (!check_result(API(dhm_calc_secret)(handle, ret->key, secret_key_length, &secret_key_length, my_rand, nullptr)))
#elif API_VERSION_NUMBER >= 0x01030000
if (!check_result(API(dhm_calc_secret)(handle, ret->key, &secret_key_length, my_rand, nullptr)))
#else
if (!check_result(API(dhm_calc_secret)(handle, ret->key, &secret_key_length)))
#endif
{
tr_dh_secret_free(ret);
return nullptr;
}
tr_dh_secret_align(ret, secret_key_length);
return ret;
}
/***
****
***/
bool tr_rand_buffer(void* buffer, size_t length)
{
if (length == 0)
{
return true;
}
TR_ASSERT(buffer != nullptr);
auto const lock = std::lock_guard(rng_mutex_);
return check_result(API(ctr_drbg_random)(get_rng(), static_cast<unsigned char*>(buffer), length));
}
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