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transmission/libtransmission/crypto-utils-openssl.cc

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// This file Copyright © 2007-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0), GPLv3 (SPDX: GPL-3.0),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#ifdef __APPLE__
/* OpenSSL "deprecated" as of OS X 10.7, but we still use it */
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
#include <openssl/bn.h>
#include <openssl/crypto.h>
#include <openssl/dh.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 "transmission.h"
#include "crypto-utils.h"
#include "log.h"
#include "tr-assert.h"
#include "utils.h"
#define TR_CRYPTO_DH_SECRET_FALLBACK
#include "crypto-utils-fallback.cc"
/***
****
***/
static char constexpr MyName[] = "tr_crypto_utils";
static void log_openssl_error(char const* file, int line)
{
unsigned long const error_code = ERR_get_error();
if (tr_logLevelIsActive(TR_LOG_ERROR))
{
char buf[512];
#ifndef TR_LIGHTWEIGHT
static bool strings_loaded = false;
if (!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;
}
#endif
ERR_error_string_n(error_code, buf, sizeof(buf));
tr_logAddMessage(file, line, TR_LOG_ERROR, MyName, "OpenSSL error: %s", buf);
}
}
#define log_error() log_openssl_error(__FILE__, __LINE__)
static 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__)
#define check_result_neq(result, x_result) check_openssl_result((result), (x_result), false, __FILE__, __LINE__)
static bool check_openssl_pointer(void const* pointer, char const* file, int line)
{
bool const ret = pointer != nullptr;
if (!ret)
{
log_openssl_error(file, line);
}
return ret;
}
#define check_pointer(pointer) check_openssl_pointer((pointer), __FILE__, __LINE__)
/***
****
***/
tr_sha1_ctx_t tr_sha1_init()
{
EVP_MD_CTX* handle = EVP_MD_CTX_create();
if (check_result(EVP_DigestInit_ex(handle, EVP_sha1(), nullptr)))
{
return handle;
}
EVP_MD_CTX_destroy(handle);
return nullptr;
}
bool tr_sha1_update(tr_sha1_ctx_t raw_handle, void const* data, size_t data_length)
{
auto* const handle = static_cast<EVP_MD_CTX*>(raw_handle);
TR_ASSERT(handle != nullptr);
if (data_length == 0)
{
return true;
}
TR_ASSERT(data != nullptr);
return check_result(EVP_DigestUpdate(handle, data, data_length));
}
std::optional<tr_sha1_digest_t> tr_sha1_final(tr_sha1_ctx_t raw_handle)
{
auto* handle = static_cast<EVP_MD_CTX*>(raw_handle);
TR_ASSERT(handle != nullptr);
unsigned int hash_length = 0;
auto digest = tr_sha1_digest_t{};
auto* const digest_as_uchar = reinterpret_cast<unsigned char*>(std::data(digest));
bool const ok = check_result(EVP_DigestFinal_ex(handle, digest_as_uchar, &hash_length));
TR_ASSERT(!ok || hash_length == std::size(digest));
EVP_MD_CTX_destroy(handle);
return ok ? std::make_optional(digest) : std::nullopt;
}
/***
****
***/
#if OPENSSL_VERSION_NUMBER < 0x0090802fL
static EVP_CIPHER_CTX* openssl_evp_cipher_context_new(void)
{
EVP_CIPHER_CTX* handle = tr_new(EVP_CIPHER_CTX, 1);
if (handle != nullptr)
{
EVP_CIPHER_CTX_init(handle);
}
return handle;
}
static void openssl_evp_cipher_context_free(EVP_CIPHER_CTX* handle)
{
if (handle == nullptr)
{
return;
}
EVP_CIPHER_CTX_cleanup(handle);
tr_free(handle);
}
#define EVP_CIPHER_CTX_new() openssl_evp_cipher_context_new()
#define EVP_CIPHER_CTX_free(x) openssl_evp_cipher_context_free((x))
#endif
/***
****
***/
#if OPENSSL_VERSION_NUMBER < 0x10100000 || (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x20700000)
static inline int DH_set0_pqg(DH* dh, BIGNUM* p, BIGNUM* q, BIGNUM* g)
{
/* If the fields p and g in d are nullptr, the corresponding input
* parameters MUST be non-nullptr. q may remain nullptr.
*/
if ((dh->p == nullptr && p == nullptr) || (dh->g == nullptr && g == nullptr))
{
return 0;
}
if (p != nullptr)
{
BN_free(dh->p);
dh->p = p;
}
if (q != nullptr)
{
BN_free(dh->q);
dh->q = q;
}
if (g != nullptr)
{
BN_free(dh->g);
dh->g = g;
}
if (q != nullptr)
{
dh->length = BN_num_bits(q);
}
return 1;
}
static constexpr int DH_set_length(DH* dh, long length)
{
dh->length = length;
return 1;
}
static constexpr void DH_get0_key(DH const* dh, BIGNUM const** pub_key, BIGNUM const** priv_key)
{
if (pub_key != nullptr)
{
*pub_key = dh->pub_key;
}
if (priv_key != nullptr)
{
*priv_key = dh->priv_key;
}
}
#endif
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);
DH* handle = DH_new();
BIGNUM* const p = BN_bin2bn(prime_num, prime_num_length, nullptr);
BIGNUM* const g = BN_bin2bn(generator_num, generator_num_length, nullptr);
if (!check_pointer(p) || !check_pointer(g) || DH_set0_pqg(handle, p, nullptr, g) == 0)
{
BN_free(p);
BN_free(g);
DH_free(handle);
handle = nullptr;
}
return handle;
}
void tr_dh_free(tr_dh_ctx_t raw_handle)
{
auto* handle = static_cast<DH*>(raw_handle);
if (handle == nullptr)
{
return;
}
DH_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<DH*>(raw_handle);
DH_set_length(handle, private_key_length * 8);
if (!check_result(DH_generate_key(handle)))
{
return false;
}
BIGNUM const* my_public_key = nullptr;
DH_get0_key(handle, &my_public_key, nullptr);
int const my_public_key_length = BN_bn2bin(my_public_key, public_key);
int const dh_size = DH_size(handle);
tr_dh_align_key(public_key, my_public_key_length, dh_size);
if (public_key_length != nullptr)
{
*public_key_length = dh_size;
}
return true;
}
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)
{
auto* handle = static_cast<DH*>(raw_handle);
TR_ASSERT(handle != nullptr);
TR_ASSERT(other_public_key != nullptr);
BIGNUM* const other_key = BN_bin2bn(other_public_key, other_public_key_length, nullptr);
if (!check_pointer(other_key))
{
return nullptr;
}
int const dh_size = DH_size(handle);
tr_dh_secret* ret = tr_dh_secret_new(dh_size);
int const secret_key_length = DH_compute_key(ret->key, other_key, handle);
if (check_result_neq(secret_key_length, -1))
{
tr_dh_secret_align(ret, secret_key_length);
}
else
{
tr_dh_secret_free(ret);
ret = nullptr;
}
BN_free(other_key);
return ret;
}
/***
****
***/
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, (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));
}
/***
****
***/
bool tr_rand_buffer(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));
}
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