/*
- * Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2011-2020 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
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/rand.h>
-#include "rand_lcl.h"
+#include "rand_local.h"
#include "internal/thread_once.h"
-#include "internal/rand_int.h"
-#include "internal/cryptlib_int.h"
+#include "crypto/rand.h"
+#include "crypto/cryptlib.h"
/*
* Support framework for NIST SP 800-90A DRBG
CRYPTO_THREAD_LOCAL private_drbg;
} DRBG_GLOBAL;
+typedef struct drbg_nonce_global_st {
+ CRYPTO_RWLOCK *rand_nonce_lock;
+ int rand_nonce_count;
+} DRBG_NONCE_GLOBAL;
+
/* NIST SP 800-90A DRBG recommends the use of a personalization string. */
static const char ossl_pers_string[] = DRBG_DEFAULT_PERS_STRING;
unsigned int flags,
RAND_DRBG *parent);
+static int rand_drbg_set(RAND_DRBG *drbg, int type, unsigned int flags);
+static int rand_drbg_init_method(RAND_DRBG *drbg);
+
static int is_ctr(int type)
{
switch (type) {
}
}
+/*
+ * Initialize the OPENSSL_CTX global DRBGs on first use.
+ * Returns the allocated global data on success or NULL on failure.
+ */
+static void *drbg_ossl_ctx_new(OPENSSL_CTX *libctx)
+{
+ DRBG_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(0, NULL);
+#endif
+
+ if (!CRYPTO_THREAD_init_local(&dgbl->private_drbg, NULL))
+ goto err1;
+
+ if (!CRYPTO_THREAD_init_local(&dgbl->public_drbg, NULL))
+ goto err2;
+
+ dgbl->master_drbg = drbg_setup(libctx, NULL, RAND_DRBG_TYPE_MASTER);
+ if (dgbl->master_drbg == NULL)
+ goto err3;
+
+ return dgbl;
+
+ err3:
+ CRYPTO_THREAD_cleanup_local(&dgbl->public_drbg);
+ err2:
+ CRYPTO_THREAD_cleanup_local(&dgbl->private_drbg);
+ err1:
+ OPENSSL_free(dgbl);
+ return NULL;
+}
+
+static void drbg_ossl_ctx_free(void *vdgbl)
+{
+ DRBG_GLOBAL *dgbl = vdgbl;
+
+ if (dgbl == NULL)
+ return;
+
+ RAND_DRBG_free(dgbl->master_drbg);
+ CRYPTO_THREAD_cleanup_local(&dgbl->private_drbg);
+ CRYPTO_THREAD_cleanup_local(&dgbl->public_drbg);
+
+ OPENSSL_free(dgbl);
+}
+
+static const OPENSSL_CTX_METHOD drbg_ossl_ctx_method = {
+ drbg_ossl_ctx_new,
+ drbg_ossl_ctx_free,
+};
+
+/*
+ * drbg_ossl_ctx_new() calls drgb_setup() which calls rand_drbg_get_nonce()
+ * which needs to get the rand_nonce_lock out of the OPENSSL_CTX...but since
+ * drbg_ossl_ctx_new() hasn't finished running yet we need the rand_nonce_lock
+ * to be in a different global data object. Otherwise we will go into an
+ * infinite recursion loop.
+ */
+static void *drbg_nonce_ossl_ctx_new(OPENSSL_CTX *libctx)
+{
+ DRBG_NONCE_GLOBAL *dngbl = OPENSSL_zalloc(sizeof(*dngbl));
+
+ if (dngbl == NULL)
+ return NULL;
+
+ dngbl->rand_nonce_lock = CRYPTO_THREAD_lock_new();
+ if (dngbl->rand_nonce_lock == NULL) {
+ OPENSSL_free(dngbl);
+ return NULL;
+ }
+
+ return dngbl;
+}
+
+static void drbg_nonce_ossl_ctx_free(void *vdngbl)
+{
+ DRBG_NONCE_GLOBAL *dngbl = vdngbl;
+
+ if (dngbl == NULL)
+ return;
+
+ CRYPTO_THREAD_lock_free(dngbl->rand_nonce_lock);
+
+ OPENSSL_free(dngbl);
+}
+
+static const OPENSSL_CTX_METHOD drbg_nonce_ossl_ctx_method = {
+ drbg_nonce_ossl_ctx_new,
+ drbg_nonce_ossl_ctx_free,
+};
+
+static DRBG_GLOBAL *drbg_get_global(OPENSSL_CTX *libctx)
+{
+ return openssl_ctx_get_data(libctx, OPENSSL_CTX_DRBG_INDEX,
+ &drbg_ossl_ctx_method);
+}
+
+/* Implements the get_nonce() callback (see RAND_DRBG_set_callbacks()) */
+size_t rand_drbg_get_nonce(RAND_DRBG *drbg,
+ unsigned char **pout,
+ int entropy, size_t min_len, size_t max_len)
+{
+ size_t ret = 0;
+ RAND_POOL *pool;
+ DRBG_NONCE_GLOBAL *dngbl
+ = openssl_ctx_get_data(drbg->libctx, OPENSSL_CTX_DRBG_NONCE_INDEX,
+ &drbg_nonce_ossl_ctx_method);
+ struct {
+ void *instance;
+ int count;
+ } data;
+
+ if (dngbl == NULL)
+ return 0;
+
+ memset(&data, 0, sizeof(data));
+ pool = rand_pool_new(0, 0, min_len, max_len);
+ if (pool == NULL)
+ return 0;
+
+ if (rand_pool_add_nonce_data(pool) == 0)
+ goto err;
+
+ data.instance = drbg;
+ CRYPTO_atomic_add(&dngbl->rand_nonce_count, 1, &data.count,
+ dngbl->rand_nonce_lock);
+
+ if (rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0) == 0)
+ goto err;
+
+ ret = rand_pool_length(pool);
+ *pout = rand_pool_detach(pool);
+
+ err:
+ rand_pool_free(pool);
+
+ return ret;
+}
+
+/*
+ * Implements the cleanup_nonce() callback (see RAND_DRBG_set_callbacks())
+ *
+ */
+void rand_drbg_cleanup_nonce(RAND_DRBG *drbg,
+ unsigned char *out, size_t outlen)
+{
+ OPENSSL_clear_free(out, outlen);
+}
+
+/*
+ * Set the |drbg|'s callback data pointer for the entropy and nonce callbacks
+ *
+ * The ownership of the context data remains with the caller,
+ * i.e., it is the caller's responsibility to keep it available as long
+ * as it is need by the callbacks and free it after use.
+ *
+ * Setting the callback data is allowed only if the drbg has not been
+ * initialized yet. Otherwise, the operation will fail.
+ *
+ * Returns 1 on success, 0 on failure.
+ */
+int RAND_DRBG_set_callback_data(RAND_DRBG *drbg, void *data)
+{
+ if (drbg->state != DRBG_UNINITIALISED
+ || drbg->parent != NULL)
+ return 0;
+
+ drbg->callback_data = data;
+ return 1;
+}
+
+/* Retrieve the callback data pointer */
+void *RAND_DRBG_get_callback_data(RAND_DRBG *drbg)
+{
+ return drbg->callback_data;
+}
+
/*
* Set/initialize |drbg| to be of type |type|, with optional |flags|.
*
*/
int RAND_DRBG_set(RAND_DRBG *drbg, int type, unsigned int flags)
{
- int ret = 1;
+ return rand_drbg_set(drbg, type, flags) && rand_drbg_init_method(drbg);
+}
+static int rand_drbg_set(RAND_DRBG *drbg, int type, unsigned int flags)
+{
if (type == 0 && flags == 0) {
type = rand_drbg_type[RAND_DRBG_TYPE_MASTER];
flags = rand_drbg_flags[RAND_DRBG_TYPE_MASTER];
/* If set is called multiple times - clear the old one */
if (drbg->type != 0 && (type != drbg->type || flags != drbg->flags)) {
- drbg->meth->uninstantiate(drbg);
+ if (drbg->meth != NULL)
+ drbg->meth->uninstantiate(drbg);
rand_pool_free(drbg->adin_pool);
drbg->adin_pool = NULL;
}
drbg->state = DRBG_UNINITIALISED;
drbg->flags = flags;
drbg->type = type;
+ drbg->meth = NULL;
- if (type == 0) {
- /* Uninitialized; that's okay. */
- drbg->meth = NULL;
+ if (type == 0 || is_ctr(type) || is_digest(type))
+ return 1;
+
+ drbg->type = 0;
+ drbg->flags = 0;
+ RANDerr(RAND_F_RAND_DRBG_SET, RAND_R_UNSUPPORTED_DRBG_TYPE);
+
+ return 0;
+}
+
+static int rand_drbg_init_method(RAND_DRBG *drbg)
+{
+ int ret;
+
+ if (drbg->meth != NULL)
return 1;
- } else if (is_ctr(type)) {
+
+ if (is_ctr(drbg->type)) {
ret = drbg_ctr_init(drbg);
- } else if (is_digest(type)) {
- if (flags & RAND_DRBG_FLAG_HMAC)
+ } else if (is_digest(drbg->type)) {
+ if (drbg->flags & RAND_DRBG_FLAG_HMAC)
ret = drbg_hmac_init(drbg);
else
ret = drbg_hash_init(drbg);
} else {
+ /* other cases should already be excluded */
+ RANDerr(RAND_F_RAND_DRBG_INIT_METHOD, ERR_R_INTERNAL_ERROR);
drbg->type = 0;
drbg->flags = 0;
- drbg->meth = NULL;
- RANDerr(RAND_F_RAND_DRBG_SET, RAND_R_UNSUPPORTED_DRBG_TYPE);
return 0;
}
if (ret == 0) {
drbg->state = DRBG_ERROR;
- RANDerr(RAND_F_RAND_DRBG_SET, RAND_R_ERROR_INITIALISING_DRBG);
+ RANDerr(RAND_F_RAND_DRBG_INIT_METHOD, RAND_R_ERROR_INITIALISING_DRBG);
}
return ret;
}
drbg->libctx = ctx;
drbg->secure = secure && CRYPTO_secure_allocated(drbg);
- drbg->fork_count = rand_fork_count;
+ drbg->fork_id = openssl_get_fork_id();
drbg->parent = parent;
if (parent == NULL) {
-#ifdef FIPS_MODE
+#ifdef FIPS_MODULE
drbg->get_entropy = rand_crngt_get_entropy;
drbg->cleanup_entropy = rand_crngt_cleanup_entropy;
#else
drbg->meth->uninstantiate(drbg);
rand_pool_free(drbg->adin_pool);
CRYPTO_THREAD_lock_free(drbg->lock);
- CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DRBG, drbg, &drbg->ex_data);
+#ifndef FIPS_MODULE
+ CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RAND_DRBG, drbg, &drbg->ex_data);
+#endif
if (drbg->secure)
OPENSSL_secure_clear_free(drbg, sizeof(*drbg));
{
unsigned char *nonce = NULL, *entropy = NULL;
size_t noncelen = 0, entropylen = 0;
- size_t min_entropy = drbg->strength;
- size_t min_entropylen = drbg->min_entropylen;
- size_t max_entropylen = drbg->max_entropylen;
+ size_t min_entropy, min_entropylen, max_entropylen;
- if (perslen > drbg->max_perslen) {
+ if (drbg->meth == NULL && !rand_drbg_init_method(drbg)) {
RANDerr(RAND_F_RAND_DRBG_INSTANTIATE,
- RAND_R_PERSONALISATION_STRING_TOO_LONG);
+ RAND_R_NO_DRBG_IMPLEMENTATION_SELECTED);
goto end;
}
- if (drbg->meth == NULL) {
+ min_entropy = drbg->strength;
+ min_entropylen = drbg->min_entropylen;
+ max_entropylen = drbg->max_entropylen;
+
+ if (perslen > drbg->max_perslen) {
RANDerr(RAND_F_RAND_DRBG_INSTANTIATE,
- RAND_R_NO_DRBG_IMPLEMENTATION_SELECTED);
+ RAND_R_PERSONALISATION_STRING_TOO_LONG);
goto end;
}
if (drbg->state != DRBG_UNINITIALISED) {
- RANDerr(RAND_F_RAND_DRBG_INSTANTIATE,
- drbg->state == DRBG_ERROR ? RAND_R_IN_ERROR_STATE
- : RAND_R_ALREADY_INSTANTIATED);
+ if (drbg->state == DRBG_ERROR)
+ RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_IN_ERROR_STATE);
+ else
+ RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_ALREADY_INSTANTIATED);
goto end;
}
/*
* NIST SP800-90Ar1 section 9.1 says you can combine getting the entropy
* and nonce in 1 call by increasing the entropy with 50% and increasing
- * the minimum length to accomadate the length of the nonce.
+ * the minimum length to accommodate the length of the nonce.
* We do this in case a nonce is require and get_nonce is NULL.
*/
if (drbg->min_noncelen > 0 && drbg->get_nonce == NULL) {
int RAND_DRBG_uninstantiate(RAND_DRBG *drbg)
{
int index = -1, type, flags;
- if (drbg->meth == NULL) {
- drbg->state = DRBG_ERROR;
- RANDerr(RAND_F_RAND_DRBG_UNINSTANTIATE,
- RAND_R_NO_DRBG_IMPLEMENTATION_SELECTED);
- return 0;
+ if (drbg->meth != NULL) {
+ drbg->meth->uninstantiate(drbg);
+ drbg->meth = NULL;
}
- /* Clear the entire drbg->ctr struct, then reset some important
- * members of the drbg->ctr struct (e.g. keysize, df_ks) to their
- * initial values.
- */
- drbg->meth->uninstantiate(drbg);
-
/* The reset uses the default values for type and flags */
if (drbg->flags & RAND_DRBG_FLAG_MASTER)
index = RAND_DRBG_TYPE_MASTER;
flags = drbg->flags;
type = drbg->type;
}
- return RAND_DRBG_set(drbg, type, flags);
+ return rand_drbg_set(drbg, type, flags);
}
/*
int prediction_resistance,
const unsigned char *adin, size_t adinlen)
{
+ int fork_id;
int reseed_required = 0;
if (drbg->state != DRBG_READY) {
return 0;
}
- if (drbg->fork_count != rand_fork_count) {
- drbg->fork_count = rand_fork_count;
+ fork_id = openssl_get_fork_id();
+
+ if (drbg->fork_id != fork_id) {
+ drbg->fork_id = fork_id;
reseed_required = 1;
}
if (drbg->adin_pool == NULL) {
if (drbg->type == 0)
goto err;
- drbg->adin_pool = rand_pool_new(0, 0, drbg->max_adinlen);
+ drbg->adin_pool = rand_pool_new(0, 0, 0, drbg->max_adinlen);
if (drbg->adin_pool == NULL)
goto err;
}
return 1;
}
+#ifndef FIPS_MODULE
/*
* Get and set the EXDATA
*/
{
return CRYPTO_get_ex_data(&drbg->ex_data, idx);
}
-
+#endif
/*
* The following functions provide a RAND_METHOD that works on the
return NULL;
}
-/*
- * Initialize the OPENSSL_CTX global DRBGs on first use.
- * Returns the allocated global data on success or NULL on failure.
- */
-static void *drbg_ossl_ctx_new(OPENSSL_CTX *libctx)
-{
- DRBG_GLOBAL *dgbl = OPENSSL_zalloc(sizeof(*dgbl));
-
- if (dgbl == NULL)
- return NULL;
-
- if (!CRYPTO_THREAD_init_local(&dgbl->private_drbg, NULL))
- goto err1;
-
- if (!CRYPTO_THREAD_init_local(&dgbl->public_drbg, NULL))
- goto err2;
-
- dgbl->master_drbg = drbg_setup(libctx, NULL, RAND_DRBG_TYPE_MASTER);
- if (dgbl->master_drbg == NULL)
- goto err3;
-
- return dgbl;
-
- err3:
- CRYPTO_THREAD_cleanup_local(&dgbl->public_drbg);
- err2:
- CRYPTO_THREAD_cleanup_local(&dgbl->private_drbg);
- err1:
- OPENSSL_free(dgbl);
- return NULL;
-}
-
-static void drbg_ossl_ctx_free(void *vdgbl)
-{
- DRBG_GLOBAL *dgbl = vdgbl;
-
- RAND_DRBG_free(dgbl->master_drbg);
- CRYPTO_THREAD_cleanup_local(&dgbl->private_drbg);
- CRYPTO_THREAD_cleanup_local(&dgbl->public_drbg);
-
- OPENSSL_free(dgbl);
-}
-
-static const OPENSSL_CTX_METHOD drbg_ossl_ctx_method = {
- drbg_ossl_ctx_new,
- drbg_ossl_ctx_free,
-};
-
-static DRBG_GLOBAL *drbg_get_global(OPENSSL_CTX *libctx)
-{
- return openssl_ctx_get_data(libctx, OPENSSL_CTX_DRBG_INDEX,
- &drbg_ossl_ctx_method);
-}
-
-void drbg_delete_thread_state(void)
+static void drbg_delete_thread_state(void *arg)
{
+ OPENSSL_CTX *ctx = arg;
DRBG_GLOBAL *dgbl = drbg_get_global(ctx);
RAND_DRBG *drbg;
buflen = (size_t)num;
-#ifdef FIPS_MODE
+#ifdef FIPS_MODULE
/*
* NIST SP-800-90A mandates that entropy *shall not* be provided
* by the consuming application. By setting the randomness to zero,
drbg = CRYPTO_THREAD_get_local(&dgbl->public_drbg);
if (drbg == NULL) {
- if (!ossl_init_thread_start(OPENSSL_INIT_THREAD_RAND))
+ ctx = openssl_ctx_get_concrete(ctx);
+ /*
+ * If the private_drbg is also NULL then this is the first time we've
+ * used this thread.
+ */
+ if (CRYPTO_THREAD_get_local(&dgbl->private_drbg) == NULL
+ && !ossl_init_thread_start(NULL, ctx, drbg_delete_thread_state))
return NULL;
drbg = drbg_setup(ctx, dgbl->master_drbg, RAND_DRBG_TYPE_PUBLIC);
CRYPTO_THREAD_set_local(&dgbl->public_drbg, drbg);
drbg = CRYPTO_THREAD_get_local(&dgbl->private_drbg);
if (drbg == NULL) {
- if (!ossl_init_thread_start(OPENSSL_INIT_THREAD_RAND))
+ ctx = openssl_ctx_get_concrete(ctx);
+ /*
+ * If the public_drbg is also NULL then this is the first time we've
+ * used this thread.
+ */
+ if (CRYPTO_THREAD_get_local(&dgbl->public_drbg) == NULL
+ && !ossl_init_thread_start(NULL, ctx, drbg_delete_thread_state))
return NULL;
drbg = drbg_setup(ctx, dgbl->master_drbg, RAND_DRBG_TYPE_PRIVATE);
CRYPTO_THREAD_set_local(&dgbl->private_drbg, drbg);
RAND_METHOD *RAND_OpenSSL(void)
{
+#ifndef FIPS_MODULE
return &rand_meth;
+#else
+ return NULL;
+#endif
}
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