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transmission/libtransmission/crypto-utils-openssl.c

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/*
* This file Copyright (C) 2007-2014 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
*/
#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/rand.h>
#include <openssl/opensslv.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.c"
/***
****
***/
#define MY_NAME "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, NULL);
#endif
strings_loaded = true;
}
#endif
ERR_error_string_n(error_code, buf, sizeof(buf));
tr_logAddMessage(file, line, TR_LOG_ERROR, MY_NAME, "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_eq(result, x_result) check_openssl_result((result), (x_result), 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* pointer, char const* file, int line)
{
bool const ret = pointer != NULL;
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(void)
{
EVP_MD_CTX* handle = EVP_MD_CTX_create();
if (check_result(EVP_DigestInit_ex(handle, EVP_sha1(), NULL)))
{
return handle;
}
EVP_MD_CTX_destroy(handle);
return NULL;
}
bool tr_sha1_update(tr_sha1_ctx_t handle, void const* data, size_t data_length)
{
TR_ASSERT(handle != NULL);
if (data_length == 0)
{
return true;
}
TR_ASSERT(data != NULL);
return check_result(EVP_DigestUpdate(handle, data, data_length));
}
bool tr_sha1_final(tr_sha1_ctx_t handle, uint8_t* hash)
{
bool ret = true;
if (hash != NULL)
{
TR_ASSERT(handle != NULL);
unsigned int hash_length;
ret = check_result(EVP_DigestFinal_ex(handle, hash, &hash_length));
TR_ASSERT(!ret || hash_length == SHA_DIGEST_LENGTH);
}
EVP_MD_CTX_destroy(handle);
return ret;
}
/***
****
***/
#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 != NULL)
{
EVP_CIPHER_CTX_init(handle);
}
return handle;
}
static void openssl_evp_cipher_context_free(EVP_CIPHER_CTX* handle)
{
if (handle == NULL)
{
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
tr_rc4_ctx_t tr_rc4_new(void)
{
EVP_CIPHER_CTX* handle = EVP_CIPHER_CTX_new();
if (check_result(EVP_CipherInit_ex(handle, EVP_rc4(), NULL, NULL, NULL, -1)))
{
return handle;
}
EVP_CIPHER_CTX_free(handle);
return NULL;
}
void tr_rc4_free(tr_rc4_ctx_t handle)
{
if (handle == NULL)
{
return;
}
EVP_CIPHER_CTX_free(handle);
}
void tr_rc4_set_key(tr_rc4_ctx_t handle, uint8_t const* key, size_t key_length)
{
TR_ASSERT(handle != NULL);
TR_ASSERT(key != NULL);
if (!check_result(EVP_CIPHER_CTX_set_key_length(handle, key_length)))
{
return;
}
check_result(EVP_CipherInit_ex(handle, NULL, NULL, key, NULL, -1));
}
void tr_rc4_process(tr_rc4_ctx_t handle, void const* input, void* output, size_t length)
{
TR_ASSERT(handle != NULL);
if (length == 0)
{
return;
}
TR_ASSERT(input != NULL);
TR_ASSERT(output != NULL);
int output_length;
check_result(EVP_CipherUpdate(handle, output, &output_length, input, length));
}
/***
****
***/
#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 NULL, the corresponding input
* parameters MUST be non-NULL. q may remain NULL.
*/
if ((dh->p == NULL && p == NULL) || (dh->g == NULL && g == NULL))
{
return 0;
}
if (p != NULL)
{
BN_free(dh->p);
dh->p = p;
}
if (q != NULL)
{
BN_free(dh->q);
dh->q = q;
}
if (g != NULL)
{
BN_free(dh->g);
dh->g = g;
}
if (q != NULL)
{
dh->length = BN_num_bits(q);
}
return 1;
}
static inline int DH_set_length(DH* dh, long length)
{
dh->length = length;
return 1;
}
static inline void DH_get0_key(DH const* dh, BIGNUM const** pub_key, BIGNUM const** priv_key)
{
if (pub_key != NULL)
{
*pub_key = dh->pub_key;
}
if (priv_key != NULL)
{
*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 != NULL);
TR_ASSERT(generator_num != NULL);
DH* handle = DH_new();
BIGNUM* p;
BIGNUM* g;
p = BN_bin2bn(prime_num, prime_num_length, NULL);
g = BN_bin2bn(generator_num, generator_num_length, NULL);
if (!check_pointer(p) || !check_pointer(g) || !DH_set0_pqg(handle, p, NULL, g))
{
BN_free(p);
BN_free(g);
DH_free(handle);
handle = NULL;
}
return handle;
}
void tr_dh_free(tr_dh_ctx_t handle)
{
if (handle == NULL)
{
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 != NULL);
TR_ASSERT(public_key != NULL);
DH* handle = raw_handle;
int dh_size;
int my_public_key_length;
BIGNUM const* my_public_key;
DH_set_length(handle, private_key_length * 8);
if (!check_result(DH_generate_key(handle)))
{
return false;
}
DH_get0_key(handle, &my_public_key, NULL);
my_public_key_length = BN_bn2bin(my_public_key, public_key);
dh_size = DH_size(handle);
tr_dh_align_key(public_key, my_public_key_length, dh_size);
if (public_key_length != NULL)
{
*public_key_length = dh_size;
}
return true;
}
tr_dh_secret_t tr_dh_agree(tr_dh_ctx_t handle, uint8_t const* other_public_key, size_t other_public_key_length)
{
TR_ASSERT(handle != NULL);
TR_ASSERT(other_public_key != NULL);
struct tr_dh_secret* ret;
int dh_size;
int secret_key_length;
BIGNUM* other_key;
if (!check_pointer(other_key = BN_bin2bn(other_public_key, other_public_key_length, NULL)))
{
return NULL;
}
dh_size = DH_size(handle);
ret = tr_dh_secret_new(dh_size);
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 = NULL;
}
BN_free(other_key);
return ret;
}
/***
****
***/
bool tr_rand_buffer(void* buffer, size_t length)
{
TR_ASSERT(buffer != NULL);
return check_result(RAND_bytes(buffer, (int)length));
}
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