287 lines
6.9 KiB
C++
287 lines
6.9 KiB
C++
// This file Copyright © 2014-2022 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#include <mutex>
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#if defined(POLARSSL_IS_MBEDTLS)
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#define API_HEADER(x) <mbedtls/x>
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#define API(x) mbedtls_##x
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#define API_VERSION_NUMBER MBEDTLS_VERSION_NUMBER
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#else
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#define API_HEADER(x) <polarssl/x>
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#define API(x) x
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#define API_VERSION_NUMBER POLARSSL_VERSION_NUMBER
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#endif
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#include API_HEADER(base64.h)
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#include API_HEADER(ctr_drbg.h)
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#include API_HEADER(dhm.h)
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#include API_HEADER(error.h)
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#include API_HEADER(sha1.h)
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#include API_HEADER(version.h)
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#include <fmt/core.h>
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#include "transmission.h"
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#include "crypto-utils.h"
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#include "log.h"
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#include "tr-assert.h"
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#include "utils.h"
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#define TR_CRYPTO_DH_SECRET_FALLBACK
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#define TR_CRYPTO_X509_FALLBACK
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#include "crypto-utils-fallback.cc" // NOLINT(bugprone-suspicious-include)
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/***
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****
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***/
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using api_ctr_drbg_context = API(ctr_drbg_context);
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using api_sha1_context = API(sha1_context);
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using api_dhm_context = API(dhm_context);
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static void log_polarssl_error(int error_code, char const* file, int line)
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{
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if (tr_logLevelIsActive(TR_LOG_ERROR))
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{
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char error_message[256];
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#if defined(POLARSSL_IS_MBEDTLS)
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mbedtls_strerror(error_code, error_message, sizeof(error_message));
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#elif API_VERSION_NUMBER >= 0x01030000
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polarssl_strerror(error_code, error_message, sizeof(error_message));
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#else
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error_strerror(error_code, error_message, sizeof(error_message));
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#endif
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tr_logAddMessage(
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file,
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line,
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TR_LOG_ERROR,
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fmt::format(
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_("{crypto_library} error: {error} ({error_code})"),
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fmt::arg("crypto_library", "PolarSSL"),
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fmt::arg("error", error_message),
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fmt::arg("error_code", error_code)));
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}
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}
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#define log_error(error_code) log_polarssl_error((error_code), __FILE__, __LINE__)
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static bool check_polarssl_result(int result, int expected_result, char const* file, int line)
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{
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bool const ret = result == expected_result;
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if (!ret)
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{
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log_polarssl_error(result, file, line);
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}
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return ret;
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}
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#define check_result(result) check_polarssl_result((result), 0, __FILE__, __LINE__)
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#define check_result_eq(result, x_result) check_polarssl_result((result), (x_result), __FILE__, __LINE__)
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/***
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****
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***/
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static int my_rand(void* /*context*/, unsigned char* buffer, size_t buffer_size)
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{
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for (size_t i = 0; i < buffer_size; ++i)
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{
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buffer[i] = tr_rand_int_weak(256);
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}
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return 0;
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}
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static api_ctr_drbg_context* get_rng(void)
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{
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static api_ctr_drbg_context rng;
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static bool rng_initialized = false;
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if (!rng_initialized)
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{
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#if API_VERSION_NUMBER >= 0x02000000
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API(ctr_drbg_init)(&rng);
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if (!check_result(API(ctr_drbg_seed)(&rng, &my_rand, nullptr, nullptr, 0)))
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#else
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if (!check_result(API(ctr_drbg_init)(&rng, &my_rand, nullptr, nullptr, 0)))
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#endif
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{
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return nullptr;
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}
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rng_initialized = true;
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}
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return &rng;
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}
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static std::recursive_mutex rng_mutex_;
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/***
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****
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***/
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tr_sha1_ctx_t tr_sha1_init(void)
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{
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api_sha1_context* handle = tr_new0(api_sha1_context, 1);
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#if API_VERSION_NUMBER >= 0x01030800
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API(sha1_init)(handle);
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#endif
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API(sha1_starts)(handle);
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return handle;
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}
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bool tr_sha1_update(tr_sha1_ctx_t raw_handle, void const* data, size_t data_length)
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{
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auto* handle = static_cast<api_sha1_context*>(raw_handle);
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TR_ASSERT(handle != nullptr);
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if (data_length == 0)
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{
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return true;
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}
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TR_ASSERT(data != nullptr);
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API(sha1_update)(handle, static_cast<unsigned char const*>(data), data_length);
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return true;
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}
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std::optional<tr_sha1_digest_t> tr_sha1_final(tr_sha1_ctx_t raw_handle)
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{
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auto* handle = static_cast<api_sha1_context*>(raw_handle);
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TR_ASSERT(handle != nullptr);
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auto digest = tr_sha1_digest_t{};
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auto* const digest_as_uchar = reinterpret_cast<unsigned char*>(std::data(digest));
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API(sha1_finish)(handle, digest_as_uchar);
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#if API_VERSION_NUMBER >= 0x01030800
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API(sha1_free)(handle);
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#endif
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tr_free(handle);
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return digest;
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}
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/***
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****
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***/
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tr_dh_ctx_t tr_dh_new(
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uint8_t const* prime_num,
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size_t prime_num_length,
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uint8_t const* generator_num,
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size_t generator_num_length)
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{
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TR_ASSERT(prime_num != nullptr);
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TR_ASSERT(generator_num != nullptr);
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api_dhm_context* handle = tr_new0(api_dhm_context, 1);
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#if API_VERSION_NUMBER >= 0x01030800
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API(dhm_init)(handle);
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#endif
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if (!check_result(API(mpi_read_binary)(&handle->P, prime_num, prime_num_length)) ||
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!check_result(API(mpi_read_binary)(&handle->G, generator_num, generator_num_length)))
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{
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API(dhm_free)(handle);
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return nullptr;
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}
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handle->len = prime_num_length;
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return handle;
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}
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void tr_dh_free(tr_dh_ctx_t raw_handle)
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{
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auto* handle = static_cast<api_dhm_context*>(raw_handle);
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if (handle == nullptr)
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{
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return;
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}
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API(dhm_free)(handle);
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}
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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)
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{
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TR_ASSERT(raw_handle != nullptr);
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TR_ASSERT(public_key != nullptr);
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auto* handle = static_cast<api_dhm_context*>(raw_handle);
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if (public_key_length != nullptr)
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{
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*public_key_length = handle->len;
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}
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return check_result(API(dhm_make_public)(handle, private_key_length, public_key, handle->len, my_rand, nullptr));
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}
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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)
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{
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TR_ASSERT(raw_handle != nullptr);
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TR_ASSERT(other_public_key != nullptr);
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auto* handle = static_cast<api_dhm_context*>(raw_handle);
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if (!check_result(API(dhm_read_public)(handle, other_public_key, other_public_key_length)))
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{
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return nullptr;
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}
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tr_dh_secret* const ret = tr_dh_secret_new(handle->len);
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size_t secret_key_length = handle->len;
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#if API_VERSION_NUMBER >= 0x02000000
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if (!check_result(API(dhm_calc_secret)(handle, ret->key, secret_key_length, &secret_key_length, my_rand, nullptr)))
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#elif API_VERSION_NUMBER >= 0x01030000
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if (!check_result(API(dhm_calc_secret)(handle, ret->key, &secret_key_length, my_rand, nullptr)))
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#else
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if (!check_result(API(dhm_calc_secret)(handle, ret->key, &secret_key_length)))
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#endif
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{
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tr_dh_secret_free(ret);
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return nullptr;
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}
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tr_dh_secret_align(ret, secret_key_length);
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return ret;
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}
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/***
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****
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***/
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bool tr_rand_buffer(void* buffer, size_t length)
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{
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if (length == 0)
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{
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return true;
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}
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TR_ASSERT(buffer != nullptr);
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auto const lock = std::lock_guard(rng_mutex_);
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return check_result(API(ctr_drbg_random)(get_rng(), static_cast<unsigned char*>(buffer), length));
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}
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