crypto/ex_data.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@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@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@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@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@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@cryptsoft.com).  This product includes software written by Tim
 107  * Hudson (tjh@cryptsoft.com).
 108  *
 109  */
 110
 111 #include "internal/cryptlib.h"
 112 #include <openssl/lhash.h>
 113
 114
 115
 116 /*
 117  * Each structure type (sometimes called a class), that supports
 118  * exdata has a stack of callbacks for each instance.
 119  */
 120 typedef struct ex_callback_st {
 121     long argl;                  /* Arbitary long */
 122     void *argp;                 /* Arbitary void * */
 123     CRYPTO_EX_new *new_func;
 124     CRYPTO_EX_free *free_func;
 125     CRYPTO_EX_dup *dup_func;
 126 } EX_CALLBACK;
 127
 128 DECLARE_STACK_OF(EX_CALLBACK)
 129
 130 /*
 131  * The state for each class.  This could just be a typedef, but
 132  * a structure allows future changes.
 133  */
 134 typedef struct ex_callbacks_st {
 135     STACK_OF(EX_CALLBACK) *meth;
 136 } EX_CALLBACKS;
 137
 138 static EX_CALLBACKS ex_data[CRYPTO_EX_INDEX__COUNT];
 139
 140 /*
 141  * Return the EX_CALLBACKS from the |ex_data| array that corresponds to
 142  * a given class.  On success, *holds the lock.*
 143  */
 144 static EX_CALLBACKS *get_and_lock(int class_index)
 145 {
 146     EX_CALLBACKS *ip;
 147
 148     if (class_index < 0 || class_index >= CRYPTO_EX_INDEX__COUNT) {
 149         CRYPTOerr(CRYPTO_F_GET_AND_LOCK, ERR_R_MALLOC_FAILURE);
 150         return NULL;
 151     }
 152
 153     ip = &ex_data[class_index];
 154     CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
 155     if (ip->meth == NULL) {
 156         ip->meth = sk_EX_CALLBACK_new_null();
 157         /* We push an initial value on the stack because the SSL
 158          * "app_data" routines use ex_data index zero.  See RT 3710. */
 159         if (ip->meth == NULL
 160             || !sk_EX_CALLBACK_push(ip->meth, NULL)) {
 161             CRYPTOerr(CRYPTO_F_GET_AND_LOCK, ERR_R_MALLOC_FAILURE);
 162             CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
 163             return NULL;
 164         }
 165     }
 166     return ip;
 167 }
 168
 169 static void cleanup_cb(EX_CALLBACK *funcs)
 170 {
 171     OPENSSL_free(funcs);
 172 }
 173
 174 /*
 175  * Release all "ex_data" state to prevent memory leaks. This can't be made
 176  * thread-safe without overhauling a lot of stuff, and shouldn't really be
 177  * called under potential race-conditions anyway (it's for program shutdown
 178  * after all).
 179  */
 180 void CRYPTO_cleanup_all_ex_data(void)
 181 {
 182     int i;
 183
 184     for (i = 0; i < CRYPTO_EX_INDEX__COUNT; ++i) {
 185         EX_CALLBACKS *ip = &ex_data[i];
 186
 187         sk_EX_CALLBACK_pop_free(ip->meth, cleanup_cb);
 188         ip->meth = NULL;
 189     }
 190 }
 191
 192
 193 /*
 194  * Unregister a new index by replacing the callbacks with no-ops.
 195  * Any in-use instances are leaked.
 196  */
 197 static void dummy_new(void *parent, void *ptr, CRYPTO_EX_DATA *ad, int idx,
 198                      long argl, void *argp)
 199 {
 200 }
 201
 202 static void dummy_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad, int idx,
 203                        long argl, void *argp)
 204 {
 205 }
 206
 207 static int dummy_dup(CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from,
 208                      void *from_d, int idx,
 209                      long argl, void *argp)
 210 {
 211     return 0;
 212 }
 213
 214 int CRYPTO_free_ex_index(int class_index, int idx)
 215 {
 216     EX_CALLBACKS *ip = get_and_lock(class_index);
 217     EX_CALLBACK *a;
 218     int toret = 0;
 219
 220     if (ip == NULL)
 221         return 0;
 222     if (idx < 0 || idx >= sk_EX_CALLBACK_num(ip->meth))
 223         goto err;
 224     a = sk_EX_CALLBACK_value(ip->meth, idx);
 225     if (a == NULL)
 226         goto err;
 227     a->new_func = dummy_new;
 228     a->dup_func = dummy_dup;
 229     a->free_func = dummy_free;
 230     toret = 1;
 231 err:
 232     CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
 233     return toret;
 234 }
 235
 236 /*
 237  * Register a new index.
 238  */
 239 int CRYPTO_get_ex_new_index(int class_index, long argl, void *argp,
 240                             CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
 241                             CRYPTO_EX_free *free_func)
 242 {
 243     int toret = -1;
 244     EX_CALLBACK *a;
 245     EX_CALLBACKS *ip = get_and_lock(class_index);
 246
 247     if (ip == NULL)
 248         return -1;
 249     a = (EX_CALLBACK *)OPENSSL_malloc(sizeof(*a));
 250     if (a == NULL) {
 251         CRYPTOerr(CRYPTO_F_CRYPTO_GET_EX_NEW_INDEX, ERR_R_MALLOC_FAILURE);
 252         goto err;
 253     }
 254     a->argl = argl;
 255     a->argp = argp;
 256     a->new_func = new_func;
 257     a->dup_func = dup_func;
 258     a->free_func = free_func;
 259
 260     if (!sk_EX_CALLBACK_push(ip->meth, NULL)) {
 261         CRYPTOerr(CRYPTO_F_CRYPTO_GET_EX_NEW_INDEX, ERR_R_MALLOC_FAILURE);
 262         OPENSSL_free(a);
 263         goto err;
 264     }
 265     toret = sk_EX_CALLBACK_num(ip->meth) - 1;
 266     (void)sk_EX_CALLBACK_set(ip->meth, toret, a);
 267
 268  err:
 269     CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
 270     return toret;
 271 }
 272
 273 /*
 274  * Initialise a new CRYPTO_EX_DATA for use in a particular class - including
 275  * calling new() callbacks for each index in the class used by this variable
 276  * Thread-safe by copying a class's array of "EX_CALLBACK" entries
 277  * in the lock, then using them outside the lock. Note this only applies
 278  * to the global "ex_data" state (ie. class definitions), not 'ad' itself.
 279  */
 280 int CRYPTO_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad)
 281 {
 282     int mx, i;
 283     void *ptr;
 284     EX_CALLBACK **storage = NULL;
 285     EX_CALLBACK *stack[10];
 286     EX_CALLBACKS *ip = get_and_lock(class_index);
 287
 288     if (ip == NULL)
 289         return 0;
 290
 291     ad->sk = NULL;
 292
 293     mx = sk_EX_CALLBACK_num(ip->meth);
 294     if (mx > 0) {
 295         if (mx < (int)OSSL_NELEM(stack))
 296             storage = stack;
 297         else
 298             storage = OPENSSL_malloc(sizeof(*storage) * mx);
 299         if (storage != NULL)
 300             for (i = 0; i < mx; i++)
 301                 storage[i] = sk_EX_CALLBACK_value(ip->meth, i);
 302     }
 303     CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
 304
 305     if (mx > 0 && storage == NULL) {
 306         CRYPTOerr(CRYPTO_F_CRYPTO_NEW_EX_DATA, ERR_R_MALLOC_FAILURE);
 307         return 0;
 308     }
 309     for (i = 0; i < mx; i++) {
 310         if (storage[i] && storage[i]->new_func) {
 311             ptr = CRYPTO_get_ex_data(ad, i);
 312             storage[i]->new_func(obj, ptr, ad, i,
 313                                  storage[i]->argl, storage[i]->argp);
 314         }
 315     }
 316     if (storage != stack)
 317         OPENSSL_free(storage);
 318     return 1;
 319 }
 320
 321 /*
 322  * Duplicate a CRYPTO_EX_DATA variable - including calling dup() callbacks
 323  * for each index in the class used by this variable
 324  */
 325 int CRYPTO_dup_ex_data(int class_index, CRYPTO_EX_DATA *to,
 326                        CRYPTO_EX_DATA *from)
 327 {
 328     int mx, j, i;
 329     char *ptr;
 330     EX_CALLBACK *stack[10];
 331     EX_CALLBACK **storage = NULL;
 332     EX_CALLBACKS *ip;
 333
 334     if (from->sk == NULL)
 335         /* Nothing to copy over */
 336         return 1;
 337     if ((ip = get_and_lock(class_index)) == NULL)
 338         return 0;
 339
 340     mx = sk_EX_CALLBACK_num(ip->meth);
 341     j = sk_void_num(from->sk);
 342     if (j < mx)
 343         mx = j;
 344     if (mx > 0) {
 345         if (mx < (int)OSSL_NELEM(stack))
 346             storage = stack;
 347         else
 348             storage = OPENSSL_malloc(sizeof(*storage) * mx);
 349         if (storage != NULL)
 350             for (i = 0; i < mx; i++)
 351                 storage[i] = sk_EX_CALLBACK_value(ip->meth, i);
 352     }
 353     CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
 354
 355     if (mx > 0 && storage == NULL) {
 356         CRYPTOerr(CRYPTO_F_CRYPTO_DUP_EX_DATA, ERR_R_MALLOC_FAILURE);
 357         return 0;
 358     }
 359
 360     for (i = 0; i < mx; i++) {
 361         ptr = CRYPTO_get_ex_data(from, i);
 362         if (storage[i] && storage[i]->dup_func)
 363             storage[i]->dup_func(to, from, &ptr, i,
 364                                  storage[i]->argl, storage[i]->argp);
 365         CRYPTO_set_ex_data(to, i, ptr);
 366     }
 367     if (storage != stack)
 368         OPENSSL_free(storage);
 369     return 1;
 370 }
 371
 372
 373 /*
 374  * Cleanup a CRYPTO_EX_DATA variable - including calling free() callbacks for
 375  * each index in the class used by this variable
 376  */
 377 void CRYPTO_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad)
 378 {
 379     int mx, i;
 380     EX_CALLBACKS *ip;
 381     void *ptr;
 382     EX_CALLBACK *stack[10];
 383     EX_CALLBACK **storage = NULL;
 384
 385     if ((ip = get_and_lock(class_index)) == NULL)
 386         return;
 387
 388     mx = sk_EX_CALLBACK_num(ip->meth);
 389     if (mx > 0) {
 390         if (mx < (int)OSSL_NELEM(stack))
 391             storage = stack;
 392         else
 393             storage = OPENSSL_malloc(sizeof(*storage) * mx);
 394         if (storage != NULL)
 395             for (i = 0; i < mx; i++)
 396                 storage[i] = sk_EX_CALLBACK_value(ip->meth, i);
 397     }
 398     CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
 399
 400     if (mx > 0 && storage == NULL) {
 401         CRYPTOerr(CRYPTO_F_CRYPTO_FREE_EX_DATA, ERR_R_MALLOC_FAILURE);
 402         return;
 403     }
 404     for (i = 0; i < mx; i++) {
 405         if (storage[i] && storage[i]->free_func) {
 406             ptr = CRYPTO_get_ex_data(ad, i);
 407             storage[i]->free_func(obj, ptr, ad, i,
 408                                   storage[i]->argl, storage[i]->argp);
 409         }
 410     }
 411
 412     if (storage != stack)
 413         OPENSSL_free(storage);
 414     sk_void_free(ad->sk);
 415     ad->sk = NULL;
 416 }
 417
 418 /*
 419  * For a given CRYPTO_EX_DATA variable, set the value corresponding to a
 420  * particular index in the class used by this variable
 421  */
 422 int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int idx, void *val)
 423 {
 424     int i;
 425
 426     if (ad->sk == NULL) {
 427         if ((ad->sk = sk_void_new_null()) == NULL) {
 428             CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA, ERR_R_MALLOC_FAILURE);
 429             return 0;
 430         }
 431     }
 432
 433     for (i = sk_void_num(ad->sk); i <= idx; ++i) {
 434         if (!sk_void_push(ad->sk, NULL)) {
 435             CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA, ERR_R_MALLOC_FAILURE);
 436             return 0;
 437         }
 438     }
 439     sk_void_set(ad->sk, idx, val);
 440     return 1;
 441 }
 442
 443 /*
 444  * For a given CRYPTO_EX_DATA_ variable, get the value corresponding to a
 445  * particular index in the class used by this variable
 446  */
 447 void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx)
 448 {
 449     if (ad->sk == NULL || idx >= sk_void_num(ad->sk))
 450         return NULL;
 451     return sk_void_value(ad->sk, idx);
 452 }