1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] 56 */ 57 /* ==================================================================== 58 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. 59 * 60 * Redistribution and use in source and binary forms, with or without 61 * modification, are permitted provided that the following conditions 62 * are met: 63 * 64 * 1. Redistributions of source code must retain the above copyright 65 * notice, this list of conditions and the following disclaimer. 66 * 67 * 2. Redistributions in binary form must reproduce the above copyright 68 * notice, this list of conditions and the following disclaimer in 69 * the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3. All advertising materials mentioning features or use of this 73 * software must display the following acknowledgment: 74 * "This product includes software developed by the OpenSSL Project 75 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 76 * 77 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 78 * endorse or promote products derived from this software without 79 * prior written permission. For written permission, please contact 80 * openssl-core (at) openssl.org. 81 * 82 * 5. Products derived from this software may not be called "OpenSSL" 83 * nor may "OpenSSL" appear in their names without prior written 84 * permission of the OpenSSL Project. 85 * 86 * 6. Redistributions of any form whatsoever must retain the following 87 * acknowledgment: 88 * "This product includes software developed by the OpenSSL Project 89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 92 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 95 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 96 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 97 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 98 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 100 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 101 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 102 * OF THE POSSIBILITY OF SUCH DAMAGE. 103 * ==================================================================== 104 * 105 * This product includes cryptographic software written by Eric Young 106 * (eay (at) cryptsoft.com). This product includes software written by Tim 107 * Hudson (tjh (at) cryptsoft.com). */ 108 109 #include <openssl/ex_data.h> 110 111 #include <assert.h> 112 #include <string.h> 113 114 #include <openssl/crypto.h> 115 #include <openssl/err.h> 116 #include <openssl/lhash.h> 117 #include <openssl/mem.h> 118 #include <openssl/stack.h> 119 #include <openssl/thread.h> 120 121 #include "internal.h" 122 123 124 struct crypto_ex_data_func_st { 125 long argl; /* Arbitary long */ 126 void *argp; /* Arbitary void pointer */ 127 CRYPTO_EX_free *free_func; 128 CRYPTO_EX_dup *dup_func; 129 }; 130 131 int CRYPTO_get_ex_new_index(CRYPTO_EX_DATA_CLASS *ex_data_class, int *out_index, 132 long argl, void *argp, CRYPTO_EX_dup *dup_func, 133 CRYPTO_EX_free *free_func) { 134 CRYPTO_EX_DATA_FUNCS *funcs; 135 int ret = 0; 136 137 funcs = OPENSSL_malloc(sizeof(CRYPTO_EX_DATA_FUNCS)); 138 if (funcs == NULL) { 139 OPENSSL_PUT_ERROR(CRYPTO, ERR_R_MALLOC_FAILURE); 140 return 0; 141 } 142 143 funcs->argl = argl; 144 funcs->argp = argp; 145 funcs->dup_func = dup_func; 146 funcs->free_func = free_func; 147 148 CRYPTO_STATIC_MUTEX_lock_write(&ex_data_class->lock); 149 150 if (ex_data_class->meth == NULL) { 151 ex_data_class->meth = sk_CRYPTO_EX_DATA_FUNCS_new_null(); 152 } 153 154 if (ex_data_class->meth == NULL || 155 !sk_CRYPTO_EX_DATA_FUNCS_push(ex_data_class->meth, funcs)) { 156 OPENSSL_PUT_ERROR(CRYPTO, ERR_R_MALLOC_FAILURE); 157 OPENSSL_free(funcs); 158 goto err; 159 } 160 161 *out_index = sk_CRYPTO_EX_DATA_FUNCS_num(ex_data_class->meth) - 1 + 162 ex_data_class->num_reserved; 163 ret = 1; 164 165 err: 166 CRYPTO_STATIC_MUTEX_unlock(&ex_data_class->lock); 167 return ret; 168 } 169 170 int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int index, void *val) { 171 int n, i; 172 173 if (ad->sk == NULL) { 174 ad->sk = sk_void_new_null(); 175 if (ad->sk == NULL) { 176 OPENSSL_PUT_ERROR(CRYPTO, ERR_R_MALLOC_FAILURE); 177 return 0; 178 } 179 } 180 181 n = sk_void_num(ad->sk); 182 183 /* Add NULL values until the stack is long enough. */ 184 for (i = n; i <= index; i++) { 185 if (!sk_void_push(ad->sk, NULL)) { 186 OPENSSL_PUT_ERROR(CRYPTO, ERR_R_MALLOC_FAILURE); 187 return 0; 188 } 189 } 190 191 sk_void_set(ad->sk, index, val); 192 return 1; 193 } 194 195 void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx) { 196 if (ad->sk == NULL || idx < 0 || (size_t)idx >= sk_void_num(ad->sk)) { 197 return NULL; 198 } 199 return sk_void_value(ad->sk, idx); 200 } 201 202 /* get_func_pointers takes a copy of the CRYPTO_EX_DATA_FUNCS pointers, if any, 203 * for the given class. If there are some pointers, it sets |*out| to point to 204 * a fresh stack of them. Otherwise it sets |*out| to NULL. It returns one on 205 * success or zero on error. */ 206 static int get_func_pointers(STACK_OF(CRYPTO_EX_DATA_FUNCS) **out, 207 CRYPTO_EX_DATA_CLASS *ex_data_class) { 208 size_t n; 209 210 *out = NULL; 211 212 /* CRYPTO_EX_DATA_FUNCS structures are static once set, so we can take a 213 * shallow copy of the list under lock and then use the structures without 214 * the lock held. */ 215 CRYPTO_STATIC_MUTEX_lock_read(&ex_data_class->lock); 216 n = sk_CRYPTO_EX_DATA_FUNCS_num(ex_data_class->meth); 217 if (n > 0) { 218 *out = sk_CRYPTO_EX_DATA_FUNCS_dup(ex_data_class->meth); 219 } 220 CRYPTO_STATIC_MUTEX_unlock(&ex_data_class->lock); 221 222 if (n > 0 && *out == NULL) { 223 OPENSSL_PUT_ERROR(CRYPTO, ERR_R_MALLOC_FAILURE); 224 return 0; 225 } 226 227 return 1; 228 } 229 230 void CRYPTO_new_ex_data(CRYPTO_EX_DATA *ad) { 231 ad->sk = NULL; 232 } 233 234 int CRYPTO_dup_ex_data(CRYPTO_EX_DATA_CLASS *ex_data_class, CRYPTO_EX_DATA *to, 235 const CRYPTO_EX_DATA *from) { 236 if (from->sk == NULL) { 237 /* In this case, |from| is blank, which is also the initial state of |to|, 238 * so there's nothing to do. */ 239 return 1; 240 } 241 242 STACK_OF(CRYPTO_EX_DATA_FUNCS) *func_pointers; 243 if (!get_func_pointers(&func_pointers, ex_data_class)) { 244 return 0; 245 } 246 247 size_t i; 248 for (i = 0; i < sk_CRYPTO_EX_DATA_FUNCS_num(func_pointers); i++) { 249 CRYPTO_EX_DATA_FUNCS *func_pointer = 250 sk_CRYPTO_EX_DATA_FUNCS_value(func_pointers, i); 251 void *ptr = CRYPTO_get_ex_data(from, i + ex_data_class->num_reserved); 252 if (func_pointer->dup_func) { 253 func_pointer->dup_func(to, from, &ptr, i + ex_data_class->num_reserved, 254 func_pointer->argl, func_pointer->argp); 255 } 256 CRYPTO_set_ex_data(to, i + ex_data_class->num_reserved, ptr); 257 } 258 259 sk_CRYPTO_EX_DATA_FUNCS_free(func_pointers); 260 261 return 1; 262 } 263 264 void CRYPTO_free_ex_data(CRYPTO_EX_DATA_CLASS *ex_data_class, void *obj, 265 CRYPTO_EX_DATA *ad) { 266 if (ad->sk == NULL) { 267 /* Nothing to do. */ 268 return; 269 } 270 271 STACK_OF(CRYPTO_EX_DATA_FUNCS) *func_pointers; 272 if (!get_func_pointers(&func_pointers, ex_data_class)) { 273 /* TODO(davidben): This leaks memory on malloc error. */ 274 return; 275 } 276 277 size_t i; 278 for (i = 0; i < sk_CRYPTO_EX_DATA_FUNCS_num(func_pointers); i++) { 279 CRYPTO_EX_DATA_FUNCS *func_pointer = 280 sk_CRYPTO_EX_DATA_FUNCS_value(func_pointers, i); 281 if (func_pointer->free_func) { 282 void *ptr = CRYPTO_get_ex_data(ad, i + ex_data_class->num_reserved); 283 func_pointer->free_func(obj, ptr, ad, i + ex_data_class->num_reserved, 284 func_pointer->argl, func_pointer->argp); 285 } 286 } 287 288 sk_CRYPTO_EX_DATA_FUNCS_free(func_pointers); 289 290 sk_void_free(ad->sk); 291 ad->sk = NULL; 292 } 293 294 void CRYPTO_cleanup_all_ex_data(void) {} 295
