/*
- * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
*
- * Licensed under the OpenSSL license (the "License"). You may not use
+ * 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
*/
-#include <stdio.h>
-#include <time.h>
-#include "internal/cryptlib.h"
+/* We need to use some engine deprecated APIs */
+#define OPENSSL_SUPPRESS_DEPRECATED
+
+#include <openssl/err.h>
#include <openssl/opensslconf.h>
-#include "internal/rand.h"
-#include <openssl/engine.h>
+#include <openssl/core_names.h>
+#include "internal/cryptlib.h"
#include "internal/thread_once.h"
+#include "crypto/rand.h"
+#include "crypto/cryptlib.h"
+#include "rand_local.h"
+#include "crypto/context.h"
-#ifndef OPENSSL_NO_ENGINE
+#ifndef FIPS_MODULE
+# include <stdio.h>
+# include <time.h>
+# include <limits.h>
+# include <openssl/conf.h>
+# include <openssl/trace.h>
+# include <openssl/engine.h>
+# include "crypto/rand_pool.h"
+# include "prov/seeding.h"
+# include "internal/e_os.h"
+# include "internal/property.h"
+
+# ifndef OPENSSL_NO_ENGINE
/* non-NULL if default_RAND_meth is ENGINE-provided */
-static ENGINE *funct_ref = NULL;
-static CRYPTO_RWLOCK *rand_engine_lock = NULL;
-#endif
-static const RAND_METHOD *default_RAND_meth = NULL;
-static CRYPTO_RWLOCK *rand_meth_lock = NULL;
-static CRYPTO_ONCE rand_lock_init = CRYPTO_ONCE_STATIC_INIT;
+static ENGINE *funct_ref;
+static CRYPTO_RWLOCK *rand_engine_lock;
+# endif
+# ifndef OPENSSL_NO_DEPRECATED_3_0
+static CRYPTO_RWLOCK *rand_meth_lock;
+static const RAND_METHOD *default_RAND_meth;
+# endif
+static CRYPTO_ONCE rand_init = CRYPTO_ONCE_STATIC_INIT;
-DEFINE_RUN_ONCE_STATIC(do_rand_lock_init)
+static int rand_inited = 0;
+
+DEFINE_RUN_ONCE_STATIC(do_rand_init)
{
- int ret = 1;
-#ifndef OPENSSL_NO_ENGINE
+# ifndef OPENSSL_NO_ENGINE
rand_engine_lock = CRYPTO_THREAD_lock_new();
- ret &= rand_engine_lock != NULL;
-#endif
+ if (rand_engine_lock == NULL)
+ return 0;
+# endif
+
+# ifndef OPENSSL_NO_DEPRECATED_3_0
rand_meth_lock = CRYPTO_THREAD_lock_new();
- ret &= rand_meth_lock != NULL;
- return ret;
+ if (rand_meth_lock == NULL)
+ goto err;
+# endif
+
+ if (!ossl_rand_pool_init())
+ goto err;
+
+ rand_inited = 1;
+ return 1;
+
+ err:
+# ifndef OPENSSL_NO_DEPRECATED_3_0
+ CRYPTO_THREAD_lock_free(rand_meth_lock);
+ rand_meth_lock = NULL;
+# endif
+# ifndef OPENSSL_NO_ENGINE
+ CRYPTO_THREAD_lock_free(rand_engine_lock);
+ rand_engine_lock = NULL;
+# endif
+ return 0;
}
-int RAND_set_rand_method(const RAND_METHOD *meth)
+void ossl_rand_cleanup_int(void)
+{
+# ifndef OPENSSL_NO_DEPRECATED_3_0
+ const RAND_METHOD *meth = default_RAND_meth;
+
+ if (!rand_inited)
+ return;
+
+ if (meth != NULL && meth->cleanup != NULL)
+ meth->cleanup();
+ RAND_set_rand_method(NULL);
+# endif
+ ossl_rand_pool_cleanup();
+# ifndef OPENSSL_NO_ENGINE
+ CRYPTO_THREAD_lock_free(rand_engine_lock);
+ rand_engine_lock = NULL;
+# endif
+# ifndef OPENSSL_NO_DEPRECATED_3_0
+ CRYPTO_THREAD_lock_free(rand_meth_lock);
+ rand_meth_lock = NULL;
+# endif
+ ossl_release_default_drbg_ctx();
+ 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))
+ ossl_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)
+{
+ static const char salt[] = "polling";
+
+# ifndef OPENSSL_NO_DEPRECATED_3_0
+ const RAND_METHOD *meth = RAND_get_rand_method();
+ int ret = meth == RAND_OpenSSL();
+
+ if (meth == NULL)
+ return 0;
+
+ if (!ret) {
+ /* fill random pool and seed the current legacy RNG */
+ RAND_POOL *pool = ossl_rand_pool_new(RAND_DRBG_STRENGTH, 1,
+ (RAND_DRBG_STRENGTH + 7) / 8,
+ RAND_POOL_MAX_LENGTH);
+
+ if (pool == NULL)
+ return 0;
+
+ if (ossl_pool_acquire_entropy(pool) == 0)
+ goto err;
+
+ if (meth->add == NULL
+ || meth->add(ossl_rand_pool_buffer(pool),
+ ossl_rand_pool_length(pool),
+ (ossl_rand_pool_entropy(pool) / 8.0)) == 0)
+ goto err;
+
+ ret = 1;
+ err:
+ ossl_rand_pool_free(pool);
+ return ret;
+ }
+# endif
+
+ RAND_seed(salt, sizeof(salt));
+ return 1;
+}
+
+# ifndef OPENSSL_NO_DEPRECATED_3_0
+static int rand_set_rand_method_internal(const RAND_METHOD *meth,
+ ossl_unused ENGINE *e)
{
- if (!RUN_ONCE(&rand_lock_init, do_rand_lock_init))
+ if (!RUN_ONCE(&rand_init, do_rand_init))
return 0;
- CRYPTO_THREAD_write_lock(rand_meth_lock);
-#ifndef OPENSSL_NO_ENGINE
+ if (!CRYPTO_THREAD_write_lock(rand_meth_lock))
+ return 0;
+# ifndef OPENSSL_NO_ENGINE
ENGINE_finish(funct_ref);
- funct_ref = NULL;
-#endif
+ funct_ref = e;
+# endif
default_RAND_meth = meth;
CRYPTO_THREAD_unlock(rand_meth_lock);
return 1;
}
+int RAND_set_rand_method(const RAND_METHOD *meth)
+{
+ return rand_set_rand_method_internal(meth, NULL);
+}
+
const RAND_METHOD *RAND_get_rand_method(void)
{
const RAND_METHOD *tmp_meth = NULL;
- if (!RUN_ONCE(&rand_lock_init, do_rand_lock_init))
+ if (!RUN_ONCE(&rand_init, do_rand_init))
return NULL;
- CRYPTO_THREAD_write_lock(rand_meth_lock);
- if (!default_RAND_meth) {
-#ifndef OPENSSL_NO_ENGINE
- ENGINE *e = ENGINE_get_default_RAND();
- if (e) {
- default_RAND_meth = ENGINE_get_RAND(e);
- if (default_RAND_meth == NULL) {
- ENGINE_finish(e);
- e = NULL;
- }
- }
- if (e)
+ if (!CRYPTO_THREAD_read_lock(rand_meth_lock))
+ return NULL;
+ tmp_meth = default_RAND_meth;
+ CRYPTO_THREAD_unlock(rand_meth_lock);
+ if (tmp_meth != NULL)
+ return tmp_meth;
+
+ if (!CRYPTO_THREAD_write_lock(rand_meth_lock))
+ return NULL;
+ 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;
- else
-#endif
- default_RAND_meth = RAND_OpenSSL();
+ default_RAND_meth = tmp_meth;
+ } else {
+ ENGINE_finish(e);
+ default_RAND_meth = &ossl_rand_meth;
+ }
+# else
+ default_RAND_meth = &ossl_rand_meth;
+# endif
}
tmp_meth = default_RAND_meth;
CRYPTO_THREAD_unlock(rand_meth_lock);
return tmp_meth;
}
-#ifndef OPENSSL_NO_ENGINE
+# if !defined(OPENSSL_NO_ENGINE)
int RAND_set_rand_engine(ENGINE *engine)
{
const RAND_METHOD *tmp_meth = NULL;
- if (!RUN_ONCE(&rand_lock_init, do_rand_lock_init))
+ if (!RUN_ONCE(&rand_init, do_rand_init))
return 0;
- if (engine) {
+ if (engine != NULL) {
if (!ENGINE_init(engine))
return 0;
tmp_meth = ENGINE_get_RAND(engine);
return 0;
}
}
- CRYPTO_THREAD_write_lock(rand_engine_lock);
+ if (!CRYPTO_THREAD_write_lock(rand_engine_lock)) {
+ ENGINE_finish(engine);
+ return 0;
+ }
+
/* This function releases any prior ENGINE so call it first */
- RAND_set_rand_method(tmp_meth);
- funct_ref = engine;
+ rand_set_rand_method_internal(tmp_meth, engine);
CRYPTO_THREAD_unlock(rand_engine_lock);
return 1;
}
-#endif
-
-void rand_cleanup_int(void)
-{
- const RAND_METHOD *meth = default_RAND_meth;
- if (meth && meth->cleanup)
- meth->cleanup();
- RAND_set_rand_method(NULL);
- CRYPTO_THREAD_lock_free(rand_meth_lock);
- CRYPTO_THREAD_lock_free(rand_engine_lock);
-}
+# endif
+# endif /* OPENSSL_NO_DEPRECATED_3_0 */
void RAND_seed(const void *buf, int num)
{
+ EVP_RAND_CTX *drbg;
+# ifndef OPENSSL_NO_DEPRECATED_3_0
const RAND_METHOD *meth = RAND_get_rand_method();
- if (meth && meth->seed)
+
+ if (meth != NULL && meth->seed != NULL) {
meth->seed(buf, num);
+ return;
+ }
+# endif
+
+ drbg = RAND_get0_primary(NULL);
+ if (drbg != NULL && num > 0)
+ EVP_RAND_reseed(drbg, 0, NULL, 0, buf, num);
}
-void RAND_add(const void *buf, int num, double entropy)
+void RAND_add(const void *buf, int num, double randomness)
{
+ EVP_RAND_CTX *drbg;
+# ifndef OPENSSL_NO_DEPRECATED_3_0
const RAND_METHOD *meth = RAND_get_rand_method();
- if (meth && meth->add)
- meth->add(buf, num, entropy);
+
+ if (meth != NULL && meth->add != NULL) {
+ meth->add(buf, num, randomness);
+ return;
+ }
+# endif
+ drbg = RAND_get0_primary(NULL);
+ if (drbg != NULL && num > 0)
+# ifdef OPENSSL_RAND_SEED_NONE
+ /* Without an entropy source, we have to rely on the user */
+ EVP_RAND_reseed(drbg, 0, buf, num, NULL, 0);
+# else
+ /* With an entropy source, we downgrade this to additional input */
+ EVP_RAND_reseed(drbg, 0, NULL, 0, buf, num);
+# endif
}
-int RAND_bytes(unsigned char *buf, int num)
+# 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 && meth->bytes)
- return meth->bytes(buf, num);
- return (-1);
+
+ if (meth != NULL && meth->pseudorand != NULL)
+ return meth->pseudorand(buf, num);
+ ERR_raise(ERR_LIB_RAND, RAND_R_FUNC_NOT_IMPLEMENTED);
+ return -1;
}
+# endif
-#if OPENSSL_API_COMPAT < 0x10100000L
-int RAND_pseudo_bytes(unsigned char *buf, int num)
+int RAND_status(void)
{
+ EVP_RAND_CTX *rand;
+# ifndef OPENSSL_NO_DEPRECATED_3_0
const RAND_METHOD *meth = RAND_get_rand_method();
- if (meth && meth->pseudorand)
- return meth->pseudorand(buf, num);
- return (-1);
+
+ if (meth != NULL && meth != RAND_OpenSSL())
+ return meth->status != NULL ? meth->status() : 0;
+# endif
+
+ if ((rand = RAND_get0_primary(NULL)) == NULL)
+ return 0;
+ return EVP_RAND_get_state(rand) == EVP_RAND_STATE_READY;
}
+# else /* !FIPS_MODULE */
+
+# ifndef OPENSSL_NO_DEPRECATED_3_0
+const RAND_METHOD *RAND_get_rand_method(void)
+{
+ return NULL;
+}
+# endif
+#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(OSSL_LIB_CTX *ctx, unsigned char *buf, size_t num,
+ unsigned int strength)
+{
+ EVP_RAND_CTX *rand;
+#if !defined(OPENSSL_NO_DEPRECATED_3_0) && !defined(FIPS_MODULE)
+ const RAND_METHOD *meth = RAND_get_rand_method();
+
+ if (meth != NULL && meth != RAND_OpenSSL()) {
+ if (meth->bytes != NULL)
+ return meth->bytes(buf, num);
+ ERR_raise(ERR_LIB_RAND, RAND_R_FUNC_NOT_IMPLEMENTED);
+ return -1;
+ }
#endif
-int RAND_status(void)
+ rand = RAND_get0_private(ctx);
+ if (rand != NULL)
+ return EVP_RAND_generate(rand, buf, num, strength, 0, NULL, 0);
+
+ return 0;
+}
+
+int RAND_priv_bytes(unsigned char *buf, int num)
{
+ if (num < 0)
+ return 0;
+ return RAND_priv_bytes_ex(NULL, buf, (size_t)num, 0);
+}
+
+int RAND_bytes_ex(OSSL_LIB_CTX *ctx, unsigned char *buf, size_t num,
+ unsigned int strength)
+{
+ EVP_RAND_CTX *rand;
+#if !defined(OPENSSL_NO_DEPRECATED_3_0) && !defined(FIPS_MODULE)
const RAND_METHOD *meth = RAND_get_rand_method();
- if (meth && meth->status)
- return meth->status();
+
+ if (meth != NULL && meth != RAND_OpenSSL()) {
+ if (meth->bytes != NULL)
+ return meth->bytes(buf, num);
+ ERR_raise(ERR_LIB_RAND, RAND_R_FUNC_NOT_IMPLEMENTED);
+ return -1;
+ }
+#endif
+
+ rand = RAND_get0_public(ctx);
+ if (rand != NULL)
+ return EVP_RAND_generate(rand, buf, num, strength, 0, NULL, 0);
+
return 0;
}
+
+int RAND_bytes(unsigned char *buf, int num)
+{
+ if (num < 0)
+ return 0;
+ return RAND_bytes_ex(NULL, buf, (size_t)num, 0);
+}
+
+typedef struct rand_global_st {
+ /*
+ * The three shared DRBG instances
+ *
+ * There are three shared DRBG instances: <primary>, <public>, and
+ * <private>. The <public> and <private> DRBGs are secondary ones.
+ * These are used for non-secret (e.g. nonces) and secret
+ * (e.g. private keys) data respectively.
+ */
+ CRYPTO_RWLOCK *lock;
+
+ EVP_RAND_CTX *seed;
+
+ /*
+ * The <primary> DRBG
+ *
+ * Not used directly by the application, only for reseeding the two other
+ * DRBGs. It reseeds itself by pulling either randomness from os entropy
+ * sources or by consuming randomness which was added by RAND_add().
+ *
+ * The <primary> DRBG is a global instance which is accessed concurrently by
+ * all threads. The necessary locking is managed automatically by its child
+ * DRBG instances during reseeding.
+ */
+ EVP_RAND_CTX *primary;
+
+ /*
+ * The <public> DRBG
+ *
+ * Used by default for generating random bytes using RAND_bytes().
+ *
+ * The <public> secondary DRBG is thread-local, i.e., there is one instance
+ * per thread.
+ */
+ CRYPTO_THREAD_LOCAL public;
+
+ /*
+ * The <private> DRBG
+ *
+ * Used by default for generating private keys using RAND_priv_bytes()
+ *
+ * The <private> secondary DRBG is thread-local, i.e., there is one
+ * instance per thread.
+ */
+ CRYPTO_THREAD_LOCAL private;
+
+ /* Which RNG is being used by default and it's configuration settings */
+ char *rng_name;
+ char *rng_cipher;
+ char *rng_digest;
+ char *rng_propq;
+
+ /* Allow the randomness source to be changed */
+ char *seed_name;
+ char *seed_propq;
+} RAND_GLOBAL;
+
+/*
+ * Initialize the OSSL_LIB_CTX global DRBGs on first use.
+ * Returns the allocated global data on success or NULL on failure.
+ */
+void *ossl_rand_ctx_new(OSSL_LIB_CTX *libctx)
+{
+ RAND_GLOBAL *dgbl = OPENSSL_zalloc(sizeof(*dgbl));
+
+ if (dgbl == NULL)
+ return NULL;
+
+#ifndef FIPS_MODULE
+ /*
+ * We need to ensure that base libcrypto thread handling has been
+ * initialised.
+ */
+ OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL);
+#endif
+
+ dgbl->lock = CRYPTO_THREAD_lock_new();
+ if (dgbl->lock == NULL)
+ goto err1;
+
+ if (!CRYPTO_THREAD_init_local(&dgbl->private, NULL))
+ goto err1;
+
+ if (!CRYPTO_THREAD_init_local(&dgbl->public, NULL))
+ goto err2;
+
+ return dgbl;
+
+ err2:
+ CRYPTO_THREAD_cleanup_local(&dgbl->private);
+ err1:
+ CRYPTO_THREAD_lock_free(dgbl->lock);
+ OPENSSL_free(dgbl);
+ return NULL;
+}
+
+void ossl_rand_ctx_free(void *vdgbl)
+{
+ RAND_GLOBAL *dgbl = vdgbl;
+
+ if (dgbl == NULL)
+ return;
+
+ CRYPTO_THREAD_lock_free(dgbl->lock);
+ CRYPTO_THREAD_cleanup_local(&dgbl->private);
+ CRYPTO_THREAD_cleanup_local(&dgbl->public);
+ EVP_RAND_CTX_free(dgbl->primary);
+ EVP_RAND_CTX_free(dgbl->seed);
+ OPENSSL_free(dgbl->rng_name);
+ OPENSSL_free(dgbl->rng_cipher);
+ OPENSSL_free(dgbl->rng_digest);
+ OPENSSL_free(dgbl->rng_propq);
+ OPENSSL_free(dgbl->seed_name);
+ OPENSSL_free(dgbl->seed_propq);
+
+ OPENSSL_free(dgbl);
+}
+
+static RAND_GLOBAL *rand_get_global(OSSL_LIB_CTX *libctx)
+{
+ return ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_DRBG_INDEX);
+}
+
+static void rand_delete_thread_state(void *arg)
+{
+ OSSL_LIB_CTX *ctx = arg;
+ RAND_GLOBAL *dgbl = rand_get_global(ctx);
+ EVP_RAND_CTX *rand;
+
+ if (dgbl == NULL)
+ return;
+
+ rand = CRYPTO_THREAD_get_local(&dgbl->public);
+ CRYPTO_THREAD_set_local(&dgbl->public, NULL);
+ EVP_RAND_CTX_free(rand);
+
+ rand = CRYPTO_THREAD_get_local(&dgbl->private);
+ CRYPTO_THREAD_set_local(&dgbl->private, NULL);
+ EVP_RAND_CTX_free(rand);
+}
+
+#ifndef FIPS_MODULE
+static EVP_RAND_CTX *rand_new_seed(OSSL_LIB_CTX *libctx)
+{
+ EVP_RAND *rand;
+ RAND_GLOBAL *dgbl = rand_get_global(libctx);
+ EVP_RAND_CTX *ctx = NULL;
+ const char *propq;
+ char *name, *props = NULL;
+ size_t props_len;
+ OSSL_PROPERTY_LIST *pl1, *pl2, *pl3 = NULL;
+
+ if (dgbl == NULL)
+ return NULL;
+ propq = dgbl->seed_propq;
+ if (dgbl->seed_name != NULL) {
+ name = dgbl->seed_name;
+ } else {
+ /*
+ * Default to our internal seed source. This isn't part of the FIPS
+ * provider so we need to override any FIPS properties.
+ */
+ if (propq == NULL || *propq == '\0') {
+ propq = "-fips";
+ } else {
+ pl1 = ossl_parse_query(libctx, propq, 1);
+ if (pl1 == NULL) {
+ ERR_raise(ERR_LIB_RAND, RAND_R_INVALID_PROPERTY_QUERY);
+ return NULL;
+ }
+ pl2 = ossl_parse_query(libctx, "-fips", 1);
+ if (pl2 == NULL) {
+ ossl_property_free(pl1);
+ ERR_raise(ERR_LIB_RAND, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+ pl3 = ossl_property_merge(pl2, pl1);
+ ossl_property_free(pl1);
+ ossl_property_free(pl2);
+ if (pl3 == NULL) {
+ ERR_raise(ERR_LIB_RAND, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+ props_len = ossl_property_list_to_string(libctx, pl3, NULL, 0);
+ if (props_len == 0) {
+ /* Shouldn't happen since we added a query element */
+ ERR_raise(ERR_LIB_RAND, ERR_R_INTERNAL_ERROR);
+ goto err;
+ } else {
+ props = OPENSSL_malloc(props_len);
+ if (props == NULL) {
+ ERR_raise(ERR_LIB_RAND, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ if (ossl_property_list_to_string(libctx, pl3,
+ props, props_len) == 0) {
+ ERR_raise(ERR_LIB_RAND, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ ossl_property_free(pl3);
+ pl3 = NULL;
+ propq = props;
+ }
+ }
+ name = "SEED-SRC";
+ }
+
+ rand = EVP_RAND_fetch(libctx, name, propq);
+ if (rand == NULL) {
+ ERR_raise(ERR_LIB_RAND, RAND_R_UNABLE_TO_FETCH_DRBG);
+ goto err;
+ }
+ ctx = EVP_RAND_CTX_new(rand, NULL);
+ EVP_RAND_free(rand);
+ if (ctx == NULL) {
+ ERR_raise(ERR_LIB_RAND, RAND_R_UNABLE_TO_CREATE_DRBG);
+ goto err;
+ }
+ if (!EVP_RAND_instantiate(ctx, 0, 0, NULL, 0, NULL)) {
+ ERR_raise(ERR_LIB_RAND, RAND_R_ERROR_INSTANTIATING_DRBG);
+ goto err;
+ }
+ OPENSSL_free(props);
+ return ctx;
+ err:
+ EVP_RAND_CTX_free(ctx);
+ ossl_property_free(pl3);
+ OPENSSL_free(props);
+ return NULL;
+}
+
+EVP_RAND_CTX *ossl_rand_get0_seed_noncreating(OSSL_LIB_CTX *ctx)
+{
+ RAND_GLOBAL *dgbl = rand_get_global(ctx);
+ EVP_RAND_CTX *ret;
+
+ if (dgbl == NULL)
+ return NULL;
+
+ if (!CRYPTO_THREAD_read_lock(dgbl->lock))
+ return NULL;
+ ret = dgbl->seed;
+ CRYPTO_THREAD_unlock(dgbl->lock);
+ return ret;
+}
+#endif
+
+static EVP_RAND_CTX *rand_new_drbg(OSSL_LIB_CTX *libctx, EVP_RAND_CTX *parent,
+ unsigned int reseed_interval,
+ time_t reseed_time_interval, int use_df)
+{
+ EVP_RAND *rand;
+ RAND_GLOBAL *dgbl = rand_get_global(libctx);
+ EVP_RAND_CTX *ctx;
+ OSSL_PARAM params[8], *p = params;
+ const OSSL_PARAM *settables;
+ char *name, *cipher;
+
+ if (dgbl == NULL)
+ return NULL;
+ name = dgbl->rng_name != NULL ? dgbl->rng_name : "CTR-DRBG";
+ rand = EVP_RAND_fetch(libctx, name, dgbl->rng_propq);
+ if (rand == NULL) {
+ ERR_raise(ERR_LIB_RAND, RAND_R_UNABLE_TO_FETCH_DRBG);
+ return NULL;
+ }
+ ctx = EVP_RAND_CTX_new(rand, parent);
+ EVP_RAND_free(rand);
+ if (ctx == NULL) {
+ ERR_raise(ERR_LIB_RAND, RAND_R_UNABLE_TO_CREATE_DRBG);
+ return NULL;
+ }
+
+ settables = EVP_RAND_CTX_settable_params(ctx);
+ if (OSSL_PARAM_locate_const(settables, OSSL_DRBG_PARAM_CIPHER)) {
+ cipher = dgbl->rng_cipher != NULL ? dgbl->rng_cipher : "AES-256-CTR";
+ *p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_CIPHER,
+ cipher, 0);
+ }
+ if (dgbl->rng_digest != NULL
+ && OSSL_PARAM_locate_const(settables, OSSL_DRBG_PARAM_DIGEST))
+ *p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_DIGEST,
+ dgbl->rng_digest, 0);
+ if (dgbl->rng_propq != NULL)
+ *p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_PROPERTIES,
+ dgbl->rng_propq, 0);
+ if (OSSL_PARAM_locate_const(settables, OSSL_ALG_PARAM_MAC))
+ *p++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_MAC, "HMAC", 0);
+ if (OSSL_PARAM_locate_const(settables, OSSL_DRBG_PARAM_USE_DF))
+ *p++ = OSSL_PARAM_construct_int(OSSL_DRBG_PARAM_USE_DF, &use_df);
+ *p++ = OSSL_PARAM_construct_uint(OSSL_DRBG_PARAM_RESEED_REQUESTS,
+ &reseed_interval);
+ *p++ = OSSL_PARAM_construct_time_t(OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL,
+ &reseed_time_interval);
+ *p = OSSL_PARAM_construct_end();
+ if (!EVP_RAND_instantiate(ctx, 0, 0, NULL, 0, params)) {
+ ERR_raise(ERR_LIB_RAND, RAND_R_ERROR_INSTANTIATING_DRBG);
+ EVP_RAND_CTX_free(ctx);
+ return NULL;
+ }
+ return ctx;
+}
+
+/*
+ * Get the primary random generator.
+ * Returns pointer to its EVP_RAND_CTX on success, NULL on failure.
+ *
+ */
+EVP_RAND_CTX *RAND_get0_primary(OSSL_LIB_CTX *ctx)
+{
+ RAND_GLOBAL *dgbl = rand_get_global(ctx);
+ EVP_RAND_CTX *ret;
+
+ if (dgbl == NULL)
+ return NULL;
+
+ if (!CRYPTO_THREAD_read_lock(dgbl->lock))
+ return NULL;
+
+ ret = dgbl->primary;
+ CRYPTO_THREAD_unlock(dgbl->lock);
+
+ if (ret != NULL)
+ return ret;
+
+ if (!CRYPTO_THREAD_write_lock(dgbl->lock))
+ return NULL;
+
+ ret = dgbl->primary;
+ if (ret != NULL) {
+ CRYPTO_THREAD_unlock(dgbl->lock);
+ return ret;
+ }
+
+#ifndef FIPS_MODULE
+ if (dgbl->seed == NULL) {
+ ERR_set_mark();
+ dgbl->seed = rand_new_seed(ctx);
+ ERR_pop_to_mark();
+ }
+#endif
+
+ ret = dgbl->primary = rand_new_drbg(ctx, dgbl->seed,
+ PRIMARY_RESEED_INTERVAL,
+ PRIMARY_RESEED_TIME_INTERVAL, 1);
+ /*
+ * The primary DRBG may be shared between multiple threads so we must
+ * enable locking.
+ */
+ if (ret != NULL && !EVP_RAND_enable_locking(ret)) {
+ ERR_raise(ERR_LIB_EVP, EVP_R_UNABLE_TO_ENABLE_LOCKING);
+ EVP_RAND_CTX_free(ret);
+ ret = dgbl->primary = NULL;
+ }
+ CRYPTO_THREAD_unlock(dgbl->lock);
+
+ return ret;
+}
+
+/*
+ * Get the public random generator.
+ * Returns pointer to its EVP_RAND_CTX on success, NULL on failure.
+ */
+EVP_RAND_CTX *RAND_get0_public(OSSL_LIB_CTX *ctx)
+{
+ RAND_GLOBAL *dgbl = rand_get_global(ctx);
+ EVP_RAND_CTX *rand, *primary;
+
+ if (dgbl == NULL)
+ return NULL;
+
+ rand = CRYPTO_THREAD_get_local(&dgbl->public);
+ if (rand == NULL) {
+ primary = RAND_get0_primary(ctx);
+ if (primary == NULL)
+ return NULL;
+
+ ctx = ossl_lib_ctx_get_concrete(ctx);
+ /*
+ * If the private is also NULL then this is the first time we've
+ * used this thread.
+ */
+ if (CRYPTO_THREAD_get_local(&dgbl->private) == NULL
+ && !ossl_init_thread_start(NULL, ctx, rand_delete_thread_state))
+ return NULL;
+ rand = rand_new_drbg(ctx, primary, SECONDARY_RESEED_INTERVAL,
+ SECONDARY_RESEED_TIME_INTERVAL, 0);
+ CRYPTO_THREAD_set_local(&dgbl->public, rand);
+ }
+ return rand;
+}
+
+/*
+ * Get the private random generator.
+ * Returns pointer to its EVP_RAND_CTX on success, NULL on failure.
+ */
+EVP_RAND_CTX *RAND_get0_private(OSSL_LIB_CTX *ctx)
+{
+ RAND_GLOBAL *dgbl = rand_get_global(ctx);
+ EVP_RAND_CTX *rand, *primary;
+
+ if (dgbl == NULL)
+ return NULL;
+
+ rand = CRYPTO_THREAD_get_local(&dgbl->private);
+ if (rand == NULL) {
+ primary = RAND_get0_primary(ctx);
+ if (primary == NULL)
+ return NULL;
+
+ ctx = ossl_lib_ctx_get_concrete(ctx);
+ /*
+ * If the public is also NULL then this is the first time we've
+ * used this thread.
+ */
+ if (CRYPTO_THREAD_get_local(&dgbl->public) == NULL
+ && !ossl_init_thread_start(NULL, ctx, rand_delete_thread_state))
+ return NULL;
+ rand = rand_new_drbg(ctx, primary, SECONDARY_RESEED_INTERVAL,
+ SECONDARY_RESEED_TIME_INTERVAL, 0);
+ CRYPTO_THREAD_set_local(&dgbl->private, rand);
+ }
+ return rand;
+}
+
+#ifdef FIPS_MODULE
+EVP_RAND_CTX *ossl_rand_get0_private_noncreating(OSSL_LIB_CTX *ctx)
+{
+ RAND_GLOBAL *dgbl = rand_get_global(ctx);
+
+ if (dgbl == NULL)
+ return NULL;
+
+ return CRYPTO_THREAD_get_local(&dgbl->private);
+}
+#endif
+
+int RAND_set0_public(OSSL_LIB_CTX *ctx, EVP_RAND_CTX *rand)
+{
+ RAND_GLOBAL *dgbl = rand_get_global(ctx);
+ EVP_RAND_CTX *old;
+ int r;
+
+ if (dgbl == NULL)
+ return 0;
+ old = CRYPTO_THREAD_get_local(&dgbl->public);
+ if ((r = CRYPTO_THREAD_set_local(&dgbl->public, rand)) > 0)
+ EVP_RAND_CTX_free(old);
+ return r;
+}
+
+int RAND_set0_private(OSSL_LIB_CTX *ctx, EVP_RAND_CTX *rand)
+{
+ RAND_GLOBAL *dgbl = rand_get_global(ctx);
+ EVP_RAND_CTX *old;
+ int r;
+
+ if (dgbl == NULL)
+ return 0;
+ old = CRYPTO_THREAD_get_local(&dgbl->private);
+ if ((r = CRYPTO_THREAD_set_local(&dgbl->private, rand)) > 0)
+ EVP_RAND_CTX_free(old);
+ return r;
+}
+
+#ifndef FIPS_MODULE
+static int random_set_string(char **p, const char *s)
+{
+ char *d = NULL;
+
+ if (s != NULL) {
+ d = OPENSSL_strdup(s);
+ if (d == NULL)
+ return 0;
+ }
+ OPENSSL_free(*p);
+ *p = d;
+ return 1;
+}
+
+/*
+ * Load the DRBG definitions from a configuration file.
+ */
+static int random_conf_init(CONF_IMODULE *md, const CONF *cnf)
+{
+ STACK_OF(CONF_VALUE) *elist;
+ CONF_VALUE *cval;
+ RAND_GLOBAL *dgbl = rand_get_global(NCONF_get0_libctx((CONF *)cnf));
+ int i, r = 1;
+
+ OSSL_TRACE1(CONF, "Loading random module: section %s\n",
+ CONF_imodule_get_value(md));
+
+ /* Value is a section containing RANDOM configuration */
+ elist = NCONF_get_section(cnf, CONF_imodule_get_value(md));
+ if (elist == NULL) {
+ ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_RANDOM_SECTION_ERROR);
+ return 0;
+ }
+
+ if (dgbl == NULL)
+ return 0;
+
+ for (i = 0; i < sk_CONF_VALUE_num(elist); i++) {
+ cval = sk_CONF_VALUE_value(elist, i);
+ if (OPENSSL_strcasecmp(cval->name, "random") == 0) {
+ if (!random_set_string(&dgbl->rng_name, cval->value))
+ return 0;
+ } else if (OPENSSL_strcasecmp(cval->name, "cipher") == 0) {
+ if (!random_set_string(&dgbl->rng_cipher, cval->value))
+ return 0;
+ } else if (OPENSSL_strcasecmp(cval->name, "digest") == 0) {
+ if (!random_set_string(&dgbl->rng_digest, cval->value))
+ return 0;
+ } else if (OPENSSL_strcasecmp(cval->name, "properties") == 0) {
+ if (!random_set_string(&dgbl->rng_propq, cval->value))
+ return 0;
+ } else if (OPENSSL_strcasecmp(cval->name, "seed") == 0) {
+ if (!random_set_string(&dgbl->seed_name, cval->value))
+ return 0;
+ } else if (OPENSSL_strcasecmp(cval->name, "seed_properties") == 0) {
+ if (!random_set_string(&dgbl->seed_propq, cval->value))
+ return 0;
+ } else {
+ ERR_raise_data(ERR_LIB_CRYPTO,
+ CRYPTO_R_UNKNOWN_NAME_IN_RANDOM_SECTION,
+ "name=%s, value=%s", cval->name, cval->value);
+ r = 0;
+ }
+ }
+ return r;
+}
+
+
+static void random_conf_deinit(CONF_IMODULE *md)
+{
+ OSSL_TRACE(CONF, "Cleaned up random\n");
+}
+
+void ossl_random_add_conf_module(void)
+{
+ OSSL_TRACE(CONF, "Adding config module 'random'\n");
+ CONF_module_add("random", random_conf_init, random_conf_deinit);
+}
+
+int RAND_set_DRBG_type(OSSL_LIB_CTX *ctx, const char *drbg, const char *propq,
+ const char *cipher, const char *digest)
+{
+ RAND_GLOBAL *dgbl = rand_get_global(ctx);
+
+ if (dgbl == NULL)
+ return 0;
+ if (dgbl->primary != NULL) {
+ ERR_raise(ERR_LIB_CRYPTO, RAND_R_ALREADY_INSTANTIATED);
+ return 0;
+ }
+ return random_set_string(&dgbl->rng_name, drbg)
+ && random_set_string(&dgbl->rng_propq, propq)
+ && random_set_string(&dgbl->rng_cipher, cipher)
+ && random_set_string(&dgbl->rng_digest, digest);
+}
+
+int RAND_set_seed_source_type(OSSL_LIB_CTX *ctx, const char *seed,
+ const char *propq)
+{
+ RAND_GLOBAL *dgbl = rand_get_global(ctx);
+
+ if (dgbl == NULL)
+ return 0;
+ if (dgbl->seed != NULL) {
+ ERR_raise(ERR_LIB_CRYPTO, RAND_R_ALREADY_INSTANTIATED);
+ return 0;
+ }
+ return random_set_string(&dgbl->seed_name, seed)
+ && random_set_string(&dgbl->seed_propq, propq);
+}
+
+#endif
projects / openssl.git / blobdiff