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Diffstat (limited to 'src/crypto/ex_data_impl.c')
| -rw-r--r-- | src/crypto/ex_data_impl.c | 401 |
1 files changed, 401 insertions, 0 deletions
diff --git a/src/crypto/ex_data_impl.c b/src/crypto/ex_data_impl.c new file mode 100644 index 0000000..f55b369 --- /dev/null +++ b/src/crypto/ex_data_impl.c @@ -0,0 +1,401 @@ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ +/* ==================================================================== + * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-core@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). */ + +#include <openssl/ex_data.h> + +#include <assert.h> + +#include <openssl/err.h> +#include <openssl/lhash.h> +#include <openssl/mem.h> +#include <openssl/stack.h> +#include <openssl/thread.h> + +#include "crypto_error.h" +#include "internal.h" + +typedef struct crypto_ex_data_func_st { + long argl; /* Arbitary long */ + void *argp; /* Arbitary void pointer */ + CRYPTO_EX_new *new_func; + CRYPTO_EX_free *free_func; + CRYPTO_EX_dup *dup_func; +} CRYPTO_EX_DATA_FUNCS; + +typedef struct st_ex_class_item { + STACK_OF(CRYPTO_EX_DATA_FUNCS) *meth; + int class_value; +} EX_CLASS_ITEM; + +static LHASH_OF(EX_CLASS_ITEM) *global_classes = NULL; + +static int global_next_class = 100; + +static int new_class(void) { + int ret; + CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); + ret = global_next_class++; + CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); + + return ret; +} + +/* class_hash is a hash function used by an LHASH of |EX_CLASS_ITEM| + * structures. */ +static uint32_t class_hash(const EX_CLASS_ITEM *a) { + return a->class_value; +} + +/* class_cmp is a comparison function for an LHASH of |EX_CLASS_ITEM| + * structures. */ +static int class_cmp(const EX_CLASS_ITEM *a, const EX_CLASS_ITEM *b) { + return a->class_value - b->class_value; +} + +/* data_funcs_free is a callback function from |sk_pop_free| that frees a + * |CRYPTO_EX_DATA_FUNCS|. */ +static void data_funcs_free(CRYPTO_EX_DATA_FUNCS *funcs) { + OPENSSL_free(funcs); +} + +/* class_free is a callback function from lh_doall to free the EX_CLASS_ITEM + * structures. */ +static void class_free(EX_CLASS_ITEM *item) { + sk_CRYPTO_EX_DATA_FUNCS_pop_free(item->meth, data_funcs_free); + OPENSSL_free(item); +} + +static LHASH_OF(EX_CLASS_ITEM) *get_classes(void) { + LHASH_OF(EX_CLASS_ITEM) *ret; + + CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA); + ret = global_classes; + CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA); + + if (ret != NULL) { + return ret; + } + + CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); + if (global_classes == NULL) { + global_classes = lh_EX_CLASS_ITEM_new(class_hash, class_cmp); + } + ret = global_classes; + CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); + + return ret; +} + +static void cleanup(void) { + LHASH_OF(EX_CLASS_ITEM) *classes = get_classes(); + + if (classes != NULL) { + lh_EX_CLASS_ITEM_doall(classes, class_free); + lh_EX_CLASS_ITEM_free(classes); + } + + global_classes = NULL; +} + +static EX_CLASS_ITEM *get_class(int class_value) { + LHASH_OF(EX_CLASS_ITEM) *const classes = get_classes(); + EX_CLASS_ITEM template, *class_item; + int ok = 0; + + if (classes == NULL) { + return NULL; + } + + CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); + template.class_value = class_value; + class_item = lh_EX_CLASS_ITEM_retrieve(classes, &template); + if (class_item != NULL) { + ok = 1; + } else { + class_item = OPENSSL_malloc(sizeof(EX_CLASS_ITEM)); + if (class_item) { + class_item->class_value = class_value; + class_item->meth = sk_CRYPTO_EX_DATA_FUNCS_new_null(); + if (class_item->meth != NULL) { + EX_CLASS_ITEM *old_data; + ok = lh_EX_CLASS_ITEM_insert(classes, &old_data, class_item); + assert(old_data == NULL); + } + } + } + CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); + + if (!ok) { + if (class_item) { + if (class_item->meth) { + sk_CRYPTO_EX_DATA_FUNCS_free(class_item->meth); + } + OPENSSL_free(class_item); + class_item = NULL; + } + + OPENSSL_PUT_ERROR(CRYPTO, get_class, ERR_R_MALLOC_FAILURE); + } + + return class_item; +} + +static int get_new_index(int class_value, long argl, void *argp, + CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, + CRYPTO_EX_free *free_func) { + EX_CLASS_ITEM *const item = get_class(class_value); + CRYPTO_EX_DATA_FUNCS *funcs; + int ret = -1; + + if (!item) { + return -1; + } + + funcs = OPENSSL_malloc(sizeof(CRYPTO_EX_DATA_FUNCS)); + if (funcs == NULL) { + OPENSSL_PUT_ERROR(CRYPTO, get_new_index, ERR_R_MALLOC_FAILURE); + return -1; + } + + funcs->argl = argl; + funcs->argp = argp; + funcs->new_func = new_func; + funcs->dup_func = dup_func; + funcs->free_func = free_func; + + CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); + + if (!sk_CRYPTO_EX_DATA_FUNCS_push(item->meth, funcs)) { + OPENSSL_PUT_ERROR(CRYPTO, get_new_index, ERR_R_MALLOC_FAILURE); + OPENSSL_free(funcs); + goto err; + } + + ret = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth) - 1; + +err: + CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); + return ret; +} + +/* get_func_pointers takes a copy of the CRYPTO_EX_DATA_FUNCS pointers, if any, + * for the given class. If there are some pointers, it sets |*out| to point to + * a fresh stack of them. Otherwise it sets |*out| to NULL. It returns one on + * success or zero on error. */ +static int get_func_pointers(STACK_OF(CRYPTO_EX_DATA_FUNCS) **out, + int class_value) { + EX_CLASS_ITEM *const item = get_class(class_value); + size_t n; + + if (!item) { + return 0; + } + + *out = NULL; + + /* CRYPTO_EX_DATA_FUNCS structures are static once set, so we can take a + * shallow copy of the list under lock and then use the structures without + * the lock held. */ + CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA); + n = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth); + if (n > 0) { + *out = sk_CRYPTO_EX_DATA_FUNCS_dup(item->meth); + } + CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA); + + if (n > 0 && *out == NULL) { + OPENSSL_PUT_ERROR(CRYPTO, get_func_pointers, ERR_R_MALLOC_FAILURE); + return 0; + } + + return 1; +} + +static int new_ex_data(int class_value, void *obj, CRYPTO_EX_DATA *ad) { + STACK_OF(CRYPTO_EX_DATA_FUNCS) *func_pointers; + size_t i; + + ad->sk = NULL; + + if (!get_func_pointers(&func_pointers, class_value)) { + return 0; + } + + for (i = 0; i < sk_CRYPTO_EX_DATA_FUNCS_num(func_pointers); i++) { + CRYPTO_EX_DATA_FUNCS *func_pointer = + sk_CRYPTO_EX_DATA_FUNCS_value(func_pointers, i); + if (func_pointer->new_func) { + func_pointer->new_func(obj, NULL, ad, i, func_pointer->argl, + func_pointer->argp); + } + } + + sk_CRYPTO_EX_DATA_FUNCS_free(func_pointers); + + return 1; +} + +static int dup_ex_data(int class_value, CRYPTO_EX_DATA *to, + const CRYPTO_EX_DATA *from) { + STACK_OF(CRYPTO_EX_DATA_FUNCS) *func_pointers; + size_t i; + + if (!from->sk) { + /* In this case, |from| is blank, which is also the initial state of |to|, + * so there's nothing to do. */ + return 1; + } + + if (!get_func_pointers(&func_pointers, class_value)) { + return 0; + } + + for (i = 0; i < sk_CRYPTO_EX_DATA_FUNCS_num(func_pointers); i++) { + CRYPTO_EX_DATA_FUNCS *func_pointer = + sk_CRYPTO_EX_DATA_FUNCS_value(func_pointers, i); + void *ptr = CRYPTO_get_ex_data(from, i); + if (func_pointer->dup_func) { + func_pointer->dup_func(to, from, &ptr, i, func_pointer->argl, + func_pointer->argp); + } + CRYPTO_set_ex_data(to, i, ptr); + } + + sk_CRYPTO_EX_DATA_FUNCS_free(func_pointers); + + return 1; +} + +static void free_ex_data(int class_value, void *obj, CRYPTO_EX_DATA *ad) { + STACK_OF(CRYPTO_EX_DATA_FUNCS) *func_pointers; + size_t i; + + if (!get_func_pointers(&func_pointers, class_value)) { + return; + } + + for (i = 0; i < sk_CRYPTO_EX_DATA_FUNCS_num(func_pointers); i++) { + CRYPTO_EX_DATA_FUNCS *func_pointer = + sk_CRYPTO_EX_DATA_FUNCS_value(func_pointers, i); + if (func_pointer->free_func) { + void *ptr = CRYPTO_get_ex_data(ad, i); + func_pointer->free_func(obj, ptr, ad, i, func_pointer->argl, + func_pointer->argp); + } + } + + sk_CRYPTO_EX_DATA_FUNCS_free(func_pointers); + + if (ad->sk) { + sk_void_free(ad->sk); + ad->sk = NULL; + } +} + +const CRYPTO_EX_DATA_IMPL ex_data_default_impl = { + new_class, cleanup, get_new_index, new_ex_data, dup_ex_data, free_ex_data}; |