openssl/crypto/rand/rand_lib.c
Pauli e4468e6d8d deprecate engines in libcrypto
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12226)
2020-07-16 09:12:27 +02:00

308 lines
7.7 KiB
C

/*
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/* We need to use some engine deprecated APIs */
#define OPENSSL_SUPPRESS_DEPRECATED
#include <stdio.h>
#include <time.h>
#include "internal/cryptlib.h"
#include <openssl/opensslconf.h>
#include "crypto/rand.h"
#include <openssl/engine.h>
#include "internal/thread_once.h"
#include "rand_local.h"
#include "e_os.h"
#ifndef FIPS_MODULE
# include "prov/rand_pool.h"
# include "prov/seeding.h"
# ifndef OPENSSL_NO_ENGINE
/* non-NULL if default_RAND_meth is ENGINE-provided */
static ENGINE *funct_ref;
static CRYPTO_RWLOCK *rand_engine_lock;
# endif
static CRYPTO_RWLOCK *rand_meth_lock;
static const RAND_METHOD *default_RAND_meth;
static CRYPTO_ONCE rand_init = CRYPTO_ONCE_STATIC_INIT;
static int rand_inited = 0;
DEFINE_RUN_ONCE_STATIC(do_rand_init)
{
# ifndef OPENSSL_NO_ENGINE
rand_engine_lock = CRYPTO_THREAD_lock_new();
if (rand_engine_lock == NULL)
return 0;
# endif
rand_meth_lock = CRYPTO_THREAD_lock_new();
if (rand_meth_lock == NULL)
goto err;
if (!rand_pool_init())
goto err;
rand_inited = 1;
return 1;
err:
CRYPTO_THREAD_lock_free(rand_meth_lock);
rand_meth_lock = NULL;
# ifndef OPENSSL_NO_ENGINE
CRYPTO_THREAD_lock_free(rand_engine_lock);
rand_engine_lock = NULL;
# endif
return 0;
}
void rand_cleanup_int(void)
{
const RAND_METHOD *meth = default_RAND_meth;
if (!rand_inited)
return;
if (meth != NULL && meth->cleanup != NULL)
meth->cleanup();
RAND_set_rand_method(NULL);
rand_pool_cleanup();
# ifndef OPENSSL_NO_ENGINE
CRYPTO_THREAD_lock_free(rand_engine_lock);
rand_engine_lock = NULL;
# endif
CRYPTO_THREAD_lock_free(rand_meth_lock);
rand_meth_lock = NULL;
rand_inited = 0;
}
/*
* RAND_close_seed_files() ensures that any seed file descriptors are
* closed after use. This only applies to libcrypto/default provider,
* it does not apply to other providers.
*/
void RAND_keep_random_devices_open(int keep)
{
if (RUN_ONCE(&rand_init, do_rand_init))
rand_pool_keep_random_devices_open(keep);
}
/*
* RAND_poll() reseeds the default RNG using random input
*
* The random input is obtained from polling various entropy
* sources which depend on the operating system and are
* configurable via the --with-rand-seed configure option.
*/
int RAND_poll(void)
{
const RAND_METHOD *meth = RAND_get_rand_method();
int ret = meth == RAND_OpenSSL();
RAND_POOL *pool;
if (meth == NULL)
return 0;
if (!ret) {
/* fill random pool and seed the current legacy RNG */
pool = rand_pool_new(RAND_DRBG_STRENGTH, 1,
(RAND_DRBG_STRENGTH + 7) / 8,
RAND_POOL_MAX_LENGTH);
if (pool == NULL)
return 0;
if (prov_pool_acquire_entropy(pool) == 0)
goto err;
if (meth->add == NULL
|| meth->add(rand_pool_buffer(pool),
rand_pool_length(pool),
(rand_pool_entropy(pool) / 8.0)) == 0)
goto err;
ret = 1;
err:
rand_pool_free(pool);
}
return ret;
}
int RAND_set_rand_method(const RAND_METHOD *meth)
{
if (!RUN_ONCE(&rand_init, do_rand_init))
return 0;
CRYPTO_THREAD_write_lock(rand_meth_lock);
# ifndef OPENSSL_NO_ENGINE
ENGINE_finish(funct_ref);
funct_ref = NULL;
# endif
default_RAND_meth = meth;
CRYPTO_THREAD_unlock(rand_meth_lock);
return 1;
}
const RAND_METHOD *RAND_get_rand_method(void)
{
const RAND_METHOD *tmp_meth = NULL;
if (!RUN_ONCE(&rand_init, do_rand_init))
return NULL;
CRYPTO_THREAD_write_lock(rand_meth_lock);
if (default_RAND_meth == NULL) {
# ifndef OPENSSL_NO_ENGINE
ENGINE *e;
/* If we have an engine that can do RAND, use it. */
if ((e = ENGINE_get_default_RAND()) != NULL
&& (tmp_meth = ENGINE_get_RAND(e)) != NULL) {
funct_ref = e;
default_RAND_meth = tmp_meth;
} else {
ENGINE_finish(e);
default_RAND_meth = &rand_meth;
}
# else
default_RAND_meth = &rand_meth;
# endif
}
tmp_meth = default_RAND_meth;
CRYPTO_THREAD_unlock(rand_meth_lock);
return tmp_meth;
}
# if !defined(OPENSSL_NO_ENGINE)
int RAND_set_rand_engine(ENGINE *engine)
{
const RAND_METHOD *tmp_meth = NULL;
if (!RUN_ONCE(&rand_init, do_rand_init))
return 0;
if (engine != NULL) {
if (!ENGINE_init(engine))
return 0;
tmp_meth = ENGINE_get_RAND(engine);
if (tmp_meth == NULL) {
ENGINE_finish(engine);
return 0;
}
}
CRYPTO_THREAD_write_lock(rand_engine_lock);
/* This function releases any prior ENGINE so call it first */
RAND_set_rand_method(tmp_meth);
funct_ref = engine;
CRYPTO_THREAD_unlock(rand_engine_lock);
return 1;
}
# endif
void RAND_seed(const void *buf, int num)
{
const RAND_METHOD *meth = RAND_get_rand_method();
if (meth != NULL && meth->seed != NULL)
meth->seed(buf, num);
}
void RAND_add(const void *buf, int num, double randomness)
{
const RAND_METHOD *meth = RAND_get_rand_method();
if (meth != NULL && meth->add != NULL)
meth->add(buf, num, randomness);
}
# if !defined(OPENSSL_NO_DEPRECATED_1_1_0)
int RAND_pseudo_bytes(unsigned char *buf, int num)
{
const RAND_METHOD *meth = RAND_get_rand_method();
if (meth != NULL && meth->pseudorand != NULL)
return meth->pseudorand(buf, num);
RANDerr(RAND_F_RAND_PSEUDO_BYTES, RAND_R_FUNC_NOT_IMPLEMENTED);
return -1;
}
# endif
int RAND_status(void)
{
RAND_DRBG *drbg;
const RAND_METHOD *meth = RAND_get_rand_method();
if (meth != NULL && meth != RAND_OpenSSL())
return meth->status != NULL ? meth->status() : 0;
if ((drbg = RAND_DRBG_get0_master()) == NULL || drbg->rand == NULL)
return EVP_RAND_STATE_UNINITIALISED;
return EVP_RAND_state(drbg->rand) == EVP_RAND_STATE_READY;
}
#else /* !FIPS_MODULE */
const RAND_METHOD *RAND_get_rand_method(void)
{
return NULL;
}
#endif /* !FIPS_MODULE */
/*
* This function is not part of RAND_METHOD, so if we're not using
* the default method, then just call RAND_bytes(). Otherwise make
* sure we're instantiated and use the private DRBG.
*/
int RAND_priv_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num)
{
RAND_DRBG *drbg;
const RAND_METHOD *meth = RAND_get_rand_method();
if (meth != NULL && meth != RAND_OpenSSL()) {
if (meth->bytes != NULL)
return meth->bytes(buf, num);
RANDerr(RAND_F_RAND_PRIV_BYTES_EX, RAND_R_FUNC_NOT_IMPLEMENTED);
return -1;
}
drbg = OPENSSL_CTX_get0_private_drbg(ctx);
if (drbg != NULL)
return RAND_DRBG_bytes(drbg, buf, num);
return 0;
}
int RAND_priv_bytes(unsigned char *buf, int num)
{
return RAND_priv_bytes_ex(NULL, buf, num);
}
int RAND_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num)
{
RAND_DRBG *drbg;
const RAND_METHOD *meth = RAND_get_rand_method();
if (meth != NULL && meth != RAND_OpenSSL()) {
if (meth->bytes != NULL)
return meth->bytes(buf, num);
RANDerr(RAND_F_RAND_BYTES_EX, RAND_R_FUNC_NOT_IMPLEMENTED);
return -1;
}
drbg = OPENSSL_CTX_get0_public_drbg(ctx);
if (drbg != NULL)
return RAND_DRBG_bytes(drbg, buf, num);
return 0;
}
int RAND_bytes(unsigned char *buf, int num)
{
return RAND_bytes_ex(NULL, buf, num);
}