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58964a49 | 1 | /* crypto/ex_data.c */ |
3ac82faa BM |
2 | |
3 | /* | |
3a079997 | 4 | * Overhaul notes; |
3ac82faa | 5 | * |
3a079997 GT |
6 | * This code is now *mostly* thread-safe. It is now easier to understand in what |
7 | * ways it is safe and in what ways it is not, which is an improvement. Firstly, | |
8 | * all per-class stacks and index-counters for ex_data are stored in the same | |
9 | * global LHASH table (keyed by class). This hash table uses locking for all | |
10 | * access with the exception of CRYPTO_cleanup_all_ex_data(), which must only be | |
11 | * called when no other threads can possibly race against it (even if it was | |
12 | * locked, the race would mean it's possible the hash table might have been | |
13 | * recreated after the cleanup). As classes can only be added to the hash table, | |
14 | * and within each class, the stack of methods can only be incremented, the | |
15 | * locking mechanics are simpler than they would otherwise be. For example, the | |
16 | * new/dup/free ex_data functions will lock the hash table, copy the method | |
17 | * pointers it needs from the relevant class, then unlock the hash table before | |
18 | * actually applying those method pointers to the task of the new/dup/free | |
19 | * operations. As they can't be removed from the method-stack, only | |
20 | * supplemented, there's no race conditions associated with using them outside | |
21 | * the lock. The get/set_ex_data functions are not locked because they do not | |
22 | * involve this global state at all - they operate directly with a previously | |
23 | * obtained per-class method index and a particular "ex_data" variable. These | |
24 | * variables are usually instantiated per-context (eg. each RSA structure has | |
25 | * one) so locking on read/write access to that variable can be locked locally | |
26 | * if required (eg. using the "RSA" lock to synchronise access to a | |
27 | * per-RSA-structure ex_data variable if required). | |
28 | * [Geoff] | |
3ac82faa BM |
29 | */ |
30 | ||
58964a49 RE |
31 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
32 | * All rights reserved. | |
33 | * | |
34 | * This package is an SSL implementation written | |
35 | * by Eric Young (eay@cryptsoft.com). | |
36 | * The implementation was written so as to conform with Netscapes SSL. | |
ae5c8664 | 37 | * |
58964a49 RE |
38 | * This library is free for commercial and non-commercial use as long as |
39 | * the following conditions are aheared to. The following conditions | |
40 | * apply to all code found in this distribution, be it the RC4, RSA, | |
41 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
42 | * included with this distribution is covered by the same copyright terms | |
43 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
ae5c8664 | 44 | * |
58964a49 RE |
45 | * Copyright remains Eric Young's, and as such any Copyright notices in |
46 | * the code are not to be removed. | |
47 | * If this package is used in a product, Eric Young should be given attribution | |
48 | * as the author of the parts of the library used. | |
49 | * This can be in the form of a textual message at program startup or | |
50 | * in documentation (online or textual) provided with the package. | |
ae5c8664 | 51 | * |
58964a49 RE |
52 | * Redistribution and use in source and binary forms, with or without |
53 | * modification, are permitted provided that the following conditions | |
54 | * are met: | |
55 | * 1. Redistributions of source code must retain the copyright | |
56 | * notice, this list of conditions and the following disclaimer. | |
57 | * 2. Redistributions in binary form must reproduce the above copyright | |
58 | * notice, this list of conditions and the following disclaimer in the | |
59 | * documentation and/or other materials provided with the distribution. | |
60 | * 3. All advertising materials mentioning features or use of this software | |
61 | * must display the following acknowledgement: | |
62 | * "This product includes cryptographic software written by | |
63 | * Eric Young (eay@cryptsoft.com)" | |
64 | * The word 'cryptographic' can be left out if the rouines from the library | |
65 | * being used are not cryptographic related :-). | |
ae5c8664 | 66 | * 4. If you include any Windows specific code (or a derivative thereof) from |
58964a49 RE |
67 | * the apps directory (application code) you must include an acknowledgement: |
68 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
ae5c8664 | 69 | * |
58964a49 RE |
70 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
71 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
72 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
73 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
74 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
75 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
76 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
77 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
78 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
79 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
80 | * SUCH DAMAGE. | |
ae5c8664 | 81 | * |
58964a49 RE |
82 | * The licence and distribution terms for any publically available version or |
83 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
84 | * copied and put under another distribution licence | |
85 | * [including the GNU Public Licence.] | |
86 | */ | |
435037d4 BM |
87 | /* ==================================================================== |
88 | * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. | |
89 | * | |
90 | * Redistribution and use in source and binary forms, with or without | |
91 | * modification, are permitted provided that the following conditions | |
92 | * are met: | |
93 | * | |
94 | * 1. Redistributions of source code must retain the above copyright | |
ae5c8664 | 95 | * notice, this list of conditions and the following disclaimer. |
435037d4 BM |
96 | * |
97 | * 2. Redistributions in binary form must reproduce the above copyright | |
98 | * notice, this list of conditions and the following disclaimer in | |
99 | * the documentation and/or other materials provided with the | |
100 | * distribution. | |
101 | * | |
102 | * 3. All advertising materials mentioning features or use of this | |
103 | * software must display the following acknowledgment: | |
104 | * "This product includes software developed by the OpenSSL Project | |
105 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
106 | * | |
107 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
108 | * endorse or promote products derived from this software without | |
109 | * prior written permission. For written permission, please contact | |
110 | * openssl-core@openssl.org. | |
111 | * | |
112 | * 5. Products derived from this software may not be called "OpenSSL" | |
113 | * nor may "OpenSSL" appear in their names without prior written | |
114 | * permission of the OpenSSL Project. | |
115 | * | |
116 | * 6. Redistributions of any form whatsoever must retain the following | |
117 | * acknowledgment: | |
118 | * "This product includes software developed by the OpenSSL Project | |
119 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
120 | * | |
121 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
122 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
123 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
124 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
125 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
126 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
127 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
128 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
129 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
130 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
131 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
132 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
133 | * ==================================================================== | |
134 | * | |
135 | * This product includes cryptographic software written by Eric Young | |
136 | * (eay@cryptsoft.com). This product includes software written by Tim | |
137 | * Hudson (tjh@cryptsoft.com). | |
138 | * | |
139 | */ | |
58964a49 | 140 | |
58964a49 | 141 | #include "cryptlib.h" |
60a938c6 | 142 | #include <openssl/lhash.h> |
58964a49 | 143 | |
3a079997 | 144 | /* What an "implementation of ex_data functionality" looks like */ |
ae5c8664 MC |
145 | struct st_CRYPTO_EX_DATA_IMPL { |
146 | /*********************/ | |
147 | /* GLOBAL OPERATIONS */ | |
148 | /* Return a new class index */ | |
149 | int (*cb_new_class) (void); | |
150 | /* Cleanup all state used by the implementation */ | |
151 | void (*cb_cleanup) (void); | |
152 | /************************/ | |
153 | /* PER-CLASS OPERATIONS */ | |
154 | /* Get a new method index within a class */ | |
155 | int (*cb_get_new_index) (int class_index, long argl, void *argp, | |
156 | CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, | |
157 | CRYPTO_EX_free *free_func); | |
158 | /* Initialise a new CRYPTO_EX_DATA of a given class */ | |
159 | int (*cb_new_ex_data) (int class_index, void *obj, CRYPTO_EX_DATA *ad); | |
160 | /* Duplicate a CRYPTO_EX_DATA of a given class onto a copy */ | |
161 | int (*cb_dup_ex_data) (int class_index, CRYPTO_EX_DATA *to, | |
162 | CRYPTO_EX_DATA *from); | |
163 | /* Cleanup a CRYPTO_EX_DATA of a given class */ | |
164 | void (*cb_free_ex_data) (int class_index, void *obj, CRYPTO_EX_DATA *ad); | |
165 | }; | |
58964a49 | 166 | |
3a079997 GT |
167 | /* The implementation we use at run-time */ |
168 | static const CRYPTO_EX_DATA_IMPL *impl = NULL; | |
169 | ||
ae5c8664 MC |
170 | /* |
171 | * To call "impl" functions, use this macro rather than referring to 'impl' | |
172 | * directly, eg. EX_IMPL(get_new_index)(...); | |
173 | */ | |
3a079997 GT |
174 | #define EX_IMPL(a) impl->cb_##a |
175 | ||
176 | /* Predeclare the "default" ex_data implementation */ | |
177 | static int int_new_class(void); | |
178 | static void int_cleanup(void); | |
179 | static int int_get_new_index(int class_index, long argl, void *argp, | |
ae5c8664 MC |
180 | CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, |
181 | CRYPTO_EX_free *free_func); | |
182 | static int int_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad); | |
3a079997 | 183 | static int int_dup_ex_data(int class_index, CRYPTO_EX_DATA *to, |
ae5c8664 MC |
184 | CRYPTO_EX_DATA *from); |
185 | static void int_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad); | |
186 | static CRYPTO_EX_DATA_IMPL impl_default = { | |
187 | int_new_class, | |
188 | int_cleanup, | |
189 | int_get_new_index, | |
190 | int_new_ex_data, | |
191 | int_dup_ex_data, | |
192 | int_free_ex_data | |
193 | }; | |
194 | ||
195 | /* | |
196 | * Internal function that checks whether "impl" is set and if not, sets it to | |
197 | * the default. | |
198 | */ | |
3a079997 | 199 | static void impl_check(void) |
ae5c8664 MC |
200 | { |
201 | CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); | |
202 | if (!impl) | |
203 | impl = &impl_default; | |
204 | CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); | |
205 | } | |
206 | ||
207 | /* | |
208 | * A macro wrapper for impl_check that first uses a non-locked test before | |
209 | * invoking the function (which checks again inside a lock). | |
210 | */ | |
3a079997 GT |
211 | #define IMPL_CHECK if(!impl) impl_check(); |
212 | ||
213 | /* API functions to get/set the "ex_data" implementation */ | |
214 | const CRYPTO_EX_DATA_IMPL *CRYPTO_get_ex_data_implementation(void) | |
ae5c8664 MC |
215 | { |
216 | IMPL_CHECK return impl; | |
217 | } | |
218 | ||
3a079997 | 219 | int CRYPTO_set_ex_data_implementation(const CRYPTO_EX_DATA_IMPL *i) |
ae5c8664 MC |
220 | { |
221 | int toret = 0; | |
222 | CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); | |
223 | if (!impl) { | |
224 | impl = i; | |
225 | toret = 1; | |
226 | } | |
227 | CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); | |
228 | return toret; | |
229 | } | |
3a079997 GT |
230 | |
231 | /****************************************************************************/ | |
ae5c8664 MC |
232 | /* |
233 | * Interal (default) implementation of "ex_data" support. API functions are | |
234 | * further down. | |
235 | */ | |
3a079997 | 236 | |
ae5c8664 MC |
237 | /* |
238 | * The type that represents what each "class" used to implement locally. A | |
239 | * STACK of CRYPTO_EX_DATA_FUNCS plus a index-counter. The 'class_index' is | |
240 | * the global value representing the class that is used to distinguish these | |
241 | * items. | |
242 | */ | |
3a079997 | 243 | typedef struct st_ex_class_item { |
ae5c8664 MC |
244 | int class_index; |
245 | STACK_OF(CRYPTO_EX_DATA_FUNCS) *meth; | |
246 | int meth_num; | |
3a079997 GT |
247 | } EX_CLASS_ITEM; |
248 | ||
249 | /* When assigning new class indexes, this is our counter */ | |
250 | static int ex_class = CRYPTO_EX_INDEX_USER; | |
251 | ||
252 | /* The global hash table of EX_CLASS_ITEM items */ | |
3c1d6bbc BL |
253 | DECLARE_LHASH_OF(EX_CLASS_ITEM); |
254 | static LHASH_OF(EX_CLASS_ITEM) *ex_data = NULL; | |
3a079997 GT |
255 | |
256 | /* The callbacks required in the "ex_data" hash table */ | |
3c1d6bbc | 257 | static unsigned long ex_class_item_hash(const EX_CLASS_ITEM *a) |
ae5c8664 MC |
258 | { |
259 | return a->class_index; | |
260 | } | |
261 | ||
ab3eafd5 | 262 | static IMPLEMENT_LHASH_HASH_FN(ex_class_item, EX_CLASS_ITEM) |
3c1d6bbc BL |
263 | |
264 | static int ex_class_item_cmp(const EX_CLASS_ITEM *a, const EX_CLASS_ITEM *b) | |
ae5c8664 MC |
265 | { |
266 | return a->class_index - b->class_index; | |
267 | } | |
3a079997 | 268 | |
ae5c8664 | 269 | static IMPLEMENT_LHASH_COMP_FN(ex_class_item, EX_CLASS_ITEM) |
3a079997 | 270 | |
ae5c8664 MC |
271 | /* |
272 | * Internal functions used by the "impl_default" implementation to access the | |
273 | * state | |
274 | */ | |
3a079997 | 275 | static int ex_data_check(void) |
ae5c8664 MC |
276 | { |
277 | int toret = 1; | |
278 | CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); | |
279 | if (!ex_data && (ex_data = lh_EX_CLASS_ITEM_new()) == NULL) | |
280 | toret = 0; | |
281 | CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); | |
282 | return toret; | |
283 | } | |
284 | ||
285 | /* | |
286 | * This macros helps reduce the locking from repeated checks because the | |
287 | * ex_data_check() function checks ex_data again inside a lock. | |
288 | */ | |
3a079997 GT |
289 | #define EX_DATA_CHECK(iffail) if(!ex_data && !ex_data_check()) {iffail} |
290 | ||
291 | /* This "inner" callback is used by the callback function that follows it */ | |
546ec5a9 | 292 | static void def_cleanup_util_cb(CRYPTO_EX_DATA_FUNCS *funcs) |
ae5c8664 MC |
293 | { |
294 | OPENSSL_free(funcs); | |
295 | } | |
3a079997 | 296 | |
ae5c8664 MC |
297 | /* |
298 | * This callback is used in lh_doall to destroy all EX_CLASS_ITEM values from | |
299 | * "ex_data" prior to the ex_data hash table being itself destroyed. Doesn't | |
300 | * do any locking. | |
301 | */ | |
8dc344cc | 302 | static void def_cleanup_cb(void *a_void) |
ae5c8664 MC |
303 | { |
304 | EX_CLASS_ITEM *item = (EX_CLASS_ITEM *)a_void; | |
305 | sk_CRYPTO_EX_DATA_FUNCS_pop_free(item->meth, def_cleanup_util_cb); | |
306 | OPENSSL_free(item); | |
307 | } | |
308 | ||
309 | /* | |
310 | * Return the EX_CLASS_ITEM from the "ex_data" hash table that corresponds to | |
311 | * a given class. Handles locking. | |
312 | */ | |
3a079997 | 313 | static EX_CLASS_ITEM *def_get_class(int class_index) |
ae5c8664 MC |
314 | { |
315 | EX_CLASS_ITEM d, *p, *gen; | |
316 | EX_DATA_CHECK(return NULL;) | |
317 | d.class_index = class_index; | |
318 | CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); | |
319 | p = lh_EX_CLASS_ITEM_retrieve(ex_data, &d); | |
320 | if (!p) { | |
321 | gen = OPENSSL_malloc(sizeof(EX_CLASS_ITEM)); | |
322 | if (gen) { | |
323 | gen->class_index = class_index; | |
324 | gen->meth_num = 0; | |
325 | gen->meth = sk_CRYPTO_EX_DATA_FUNCS_new_null(); | |
326 | if (!gen->meth) | |
327 | OPENSSL_free(gen); | |
328 | else { | |
329 | /* | |
330 | * Because we're inside the ex_data lock, the return value | |
331 | * from the insert will be NULL | |
332 | */ | |
333 | (void)lh_EX_CLASS_ITEM_insert(ex_data, gen); | |
748cb9a1 BE |
334 | p = lh_EX_CLASS_ITEM_retrieve(ex_data, &d); |
335 | if (p != gen) { | |
336 | sk_CRYPTO_EX_DATA_FUNCS_free(gen->meth); | |
337 | OPENSSL_free(gen); | |
338 | } | |
ae5c8664 MC |
339 | } |
340 | } | |
341 | } | |
342 | CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); | |
343 | if (!p) | |
344 | CRYPTOerr(CRYPTO_F_DEF_GET_CLASS, ERR_R_MALLOC_FAILURE); | |
345 | return p; | |
346 | } | |
347 | ||
348 | /* | |
349 | * Add a new method to the given EX_CLASS_ITEM and return the corresponding | |
350 | * index (or -1 for error). Handles locking. | |
351 | */ | |
3a079997 | 352 | static int def_add_index(EX_CLASS_ITEM *item, long argl, void *argp, |
ae5c8664 MC |
353 | CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, |
354 | CRYPTO_EX_free *free_func) | |
355 | { | |
356 | int toret = -1; | |
357 | CRYPTO_EX_DATA_FUNCS *a = | |
358 | (CRYPTO_EX_DATA_FUNCS *)OPENSSL_malloc(sizeof(CRYPTO_EX_DATA_FUNCS)); | |
359 | if (!a) { | |
360 | CRYPTOerr(CRYPTO_F_DEF_ADD_INDEX, ERR_R_MALLOC_FAILURE); | |
361 | return -1; | |
362 | } | |
363 | a->argl = argl; | |
364 | a->argp = argp; | |
365 | a->new_func = new_func; | |
366 | a->dup_func = dup_func; | |
367 | a->free_func = free_func; | |
368 | CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); | |
369 | while (sk_CRYPTO_EX_DATA_FUNCS_num(item->meth) <= item->meth_num) { | |
370 | if (!sk_CRYPTO_EX_DATA_FUNCS_push(item->meth, NULL)) { | |
371 | CRYPTOerr(CRYPTO_F_DEF_ADD_INDEX, ERR_R_MALLOC_FAILURE); | |
372 | OPENSSL_free(a); | |
373 | goto err; | |
374 | } | |
375 | } | |
376 | toret = item->meth_num++; | |
377 | (void)sk_CRYPTO_EX_DATA_FUNCS_set(item->meth, toret, a); | |
378 | err: | |
379 | CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); | |
380 | return toret; | |
381 | } | |
3a079997 GT |
382 | |
383 | /**************************************************************/ | |
384 | /* The functions in the default CRYPTO_EX_DATA_IMPL structure */ | |
385 | ||
386 | static int int_new_class(void) | |
ae5c8664 MC |
387 | { |
388 | int toret; | |
389 | CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA); | |
390 | toret = ex_class++; | |
391 | CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA); | |
392 | return toret; | |
393 | } | |
3a079997 GT |
394 | |
395 | static void int_cleanup(void) | |
ae5c8664 MC |
396 | { |
397 | EX_DATA_CHECK(return;) | |
398 | lh_EX_CLASS_ITEM_doall(ex_data, def_cleanup_cb); | |
399 | lh_EX_CLASS_ITEM_free(ex_data); | |
400 | ex_data = NULL; | |
401 | impl = NULL; | |
402 | } | |
3a079997 GT |
403 | |
404 | static int int_get_new_index(int class_index, long argl, void *argp, | |
ae5c8664 MC |
405 | CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, |
406 | CRYPTO_EX_free *free_func) | |
407 | { | |
408 | EX_CLASS_ITEM *item = def_get_class(class_index); | |
409 | if (!item) | |
410 | return -1; | |
411 | return def_add_index(item, argl, argp, new_func, dup_func, free_func); | |
412 | } | |
413 | ||
414 | /* | |
415 | * Thread-safe by copying a class's array of "CRYPTO_EX_DATA_FUNCS" entries | |
416 | * in the lock, then using them outside the lock. NB: Thread-safety only | |
417 | * applies to the global "ex_data" state (ie. class definitions), not | |
418 | * thread-safe on 'ad' itself. | |
419 | */ | |
420 | static int int_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) | |
421 | { | |
422 | int mx, i; | |
423 | void *ptr; | |
424 | CRYPTO_EX_DATA_FUNCS **storage = NULL; | |
425 | EX_CLASS_ITEM *item = def_get_class(class_index); | |
426 | if (!item) | |
427 | /* error is already set */ | |
428 | return 0; | |
429 | ad->sk = NULL; | |
430 | CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA); | |
431 | mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth); | |
432 | if (mx > 0) { | |
433 | storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS *)); | |
434 | if (!storage) | |
435 | goto skip; | |
436 | for (i = 0; i < mx; i++) | |
437 | storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth, i); | |
438 | } | |
439 | skip: | |
440 | CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA); | |
441 | if ((mx > 0) && !storage) { | |
442 | CRYPTOerr(CRYPTO_F_INT_NEW_EX_DATA, ERR_R_MALLOC_FAILURE); | |
443 | return 0; | |
444 | } | |
445 | for (i = 0; i < mx; i++) { | |
446 | if (storage[i] && storage[i]->new_func) { | |
447 | ptr = CRYPTO_get_ex_data(ad, i); | |
448 | storage[i]->new_func(obj, ptr, ad, i, | |
449 | storage[i]->argl, storage[i]->argp); | |
450 | } | |
451 | } | |
452 | if (storage) | |
453 | OPENSSL_free(storage); | |
454 | return 1; | |
455 | } | |
3a079997 GT |
456 | |
457 | /* Same thread-safety notes as for "int_new_ex_data" */ | |
458 | static int int_dup_ex_data(int class_index, CRYPTO_EX_DATA *to, | |
ae5c8664 MC |
459 | CRYPTO_EX_DATA *from) |
460 | { | |
461 | int mx, j, i; | |
62f488d3 | 462 | void *ptr; |
ae5c8664 MC |
463 | CRYPTO_EX_DATA_FUNCS **storage = NULL; |
464 | EX_CLASS_ITEM *item; | |
465 | if (!from->sk) | |
466 | /* 'to' should be "blank" which *is* just like 'from' */ | |
467 | return 1; | |
468 | if ((item = def_get_class(class_index)) == NULL) | |
469 | return 0; | |
470 | CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA); | |
471 | mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth); | |
472 | j = sk_void_num(from->sk); | |
473 | if (j < mx) | |
474 | mx = j; | |
475 | if (mx > 0) { | |
24638211 TS |
476 | /* |
477 | * Make sure the ex_data stack is at least |mx| elements long to avoid | |
478 | * issues in the for loop that follows; so go get the |mx|'th element | |
479 | * (if it does not exist CRYPTO_get_ex_data() returns NULL), and assign | |
480 | * to itself. This is normally a no-op; but ensures the stack is the | |
481 | * proper size | |
482 | */ | |
483 | if (!CRYPTO_set_ex_data(to, mx - 1, CRYPTO_get_ex_data(to, mx - 1))) | |
62f488d3 | 484 | goto skip; |
ae5c8664 MC |
485 | storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS *)); |
486 | if (!storage) | |
487 | goto skip; | |
488 | for (i = 0; i < mx; i++) | |
489 | storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth, i); | |
490 | } | |
491 | skip: | |
492 | CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA); | |
493 | if ((mx > 0) && !storage) { | |
494 | CRYPTOerr(CRYPTO_F_INT_DUP_EX_DATA, ERR_R_MALLOC_FAILURE); | |
495 | return 0; | |
496 | } | |
497 | for (i = 0; i < mx; i++) { | |
498 | ptr = CRYPTO_get_ex_data(from, i); | |
499 | if (storage[i] && storage[i]->dup_func) | |
500 | storage[i]->dup_func(to, from, &ptr, i, | |
501 | storage[i]->argl, storage[i]->argp); | |
502 | CRYPTO_set_ex_data(to, i, ptr); | |
503 | } | |
504 | if (storage) | |
505 | OPENSSL_free(storage); | |
506 | return 1; | |
507 | } | |
3a079997 GT |
508 | |
509 | /* Same thread-safety notes as for "int_new_ex_data" */ | |
ae5c8664 MC |
510 | static void int_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) |
511 | { | |
512 | int mx, i; | |
513 | EX_CLASS_ITEM *item; | |
514 | void *ptr; | |
748cb9a1 | 515 | CRYPTO_EX_DATA_FUNCS *f; |
ae5c8664 | 516 | CRYPTO_EX_DATA_FUNCS **storage = NULL; |
ba252212 | 517 | if (ex_data == NULL) |
748cb9a1 | 518 | goto err; |
ae5c8664 | 519 | if ((item = def_get_class(class_index)) == NULL) |
748cb9a1 | 520 | goto err; |
ae5c8664 MC |
521 | CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA); |
522 | mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth); | |
523 | if (mx > 0) { | |
524 | storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS *)); | |
525 | if (!storage) | |
526 | goto skip; | |
527 | for (i = 0; i < mx; i++) | |
528 | storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth, i); | |
529 | } | |
530 | skip: | |
531 | CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA); | |
ae5c8664 | 532 | for (i = 0; i < mx; i++) { |
748cb9a1 BE |
533 | if (storage != NULL) |
534 | f = storage[i]; | |
535 | else { | |
536 | CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA); | |
537 | f = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth, i); | |
538 | CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA); | |
539 | } | |
540 | if (f != NULL && f->free_func != NULL) { | |
ae5c8664 | 541 | ptr = CRYPTO_get_ex_data(ad, i); |
748cb9a1 | 542 | f->free_func(obj, ptr, ad, i, f->argl, f->argp); |
ae5c8664 MC |
543 | } |
544 | } | |
748cb9a1 BE |
545 | OPENSSL_free(storage); |
546 | err: | |
547 | sk_void_free(ad->sk); | |
548 | ad->sk = NULL; | |
ae5c8664 | 549 | } |
3a079997 GT |
550 | |
551 | /********************************************************************/ | |
ae5c8664 MC |
552 | /* |
553 | * API functions that defer all "state" operations to the "ex_data" | |
554 | * implementation we have set. | |
555 | */ | |
3a079997 | 556 | |
ae5c8664 MC |
557 | /* |
558 | * Obtain an index for a new class (not the same as getting a new index | |
559 | * within an existing class - this is actually getting a new *class*) | |
560 | */ | |
3a079997 | 561 | int CRYPTO_ex_data_new_class(void) |
ae5c8664 MC |
562 | { |
563 | IMPL_CHECK return EX_IMPL(new_class) (); | |
564 | } | |
58964a49 | 565 | |
ae5c8664 MC |
566 | /* |
567 | * Release all "ex_data" state to prevent memory leaks. This can't be made | |
3a079997 GT |
568 | * thread-safe without overhauling a lot of stuff, and shouldn't really be |
569 | * called under potential race-conditions anyway (it's for program shutdown | |
ae5c8664 MC |
570 | * after all). |
571 | */ | |
3a079997 | 572 | void CRYPTO_cleanup_all_ex_data(void) |
ae5c8664 MC |
573 | { |
574 | IMPL_CHECK EX_IMPL(cleanup) (); | |
575 | } | |
3a079997 GT |
576 | |
577 | /* Inside an existing class, get/register a new index. */ | |
578 | int CRYPTO_get_ex_new_index(int class_index, long argl, void *argp, | |
ae5c8664 MC |
579 | CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, |
580 | CRYPTO_EX_free *free_func) | |
581 | { | |
582 | int ret = -1; | |
583 | ||
584 | IMPL_CHECK | |
585 | ret = EX_IMPL(get_new_index) (class_index, | |
586 | argl, argp, new_func, dup_func, | |
587 | free_func); | |
588 | return ret; | |
589 | } | |
590 | ||
591 | /* | |
592 | * Initialise a new CRYPTO_EX_DATA for use in a particular class - including | |
593 | * calling new() callbacks for each index in the class used by this variable | |
594 | */ | |
3a079997 | 595 | int CRYPTO_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) |
ae5c8664 MC |
596 | { |
597 | IMPL_CHECK return EX_IMPL(new_ex_data) (class_index, obj, ad); | |
598 | } | |
3a079997 | 599 | |
ae5c8664 MC |
600 | /* |
601 | * Duplicate a CRYPTO_EX_DATA variable - including calling dup() callbacks | |
602 | * for each index in the class used by this variable | |
603 | */ | |
3a079997 | 604 | int CRYPTO_dup_ex_data(int class_index, CRYPTO_EX_DATA *to, |
ae5c8664 MC |
605 | CRYPTO_EX_DATA *from) |
606 | { | |
607 | IMPL_CHECK return EX_IMPL(dup_ex_data) (class_index, to, from); | |
608 | } | |
609 | ||
610 | /* | |
611 | * Cleanup a CRYPTO_EX_DATA variable - including calling free() callbacks for | |
612 | * each index in the class used by this variable | |
613 | */ | |
3a079997 | 614 | void CRYPTO_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) |
ae5c8664 MC |
615 | { |
616 | IMPL_CHECK EX_IMPL(free_ex_data) (class_index, obj, ad); | |
617 | } | |
3a079997 | 618 | |
ae5c8664 MC |
619 | /* |
620 | * For a given CRYPTO_EX_DATA variable, set the value corresponding to a | |
621 | * particular index in the class used by this variable | |
622 | */ | |
dd9d233e | 623 | int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int idx, void *val) |
ae5c8664 MC |
624 | { |
625 | int i; | |
626 | ||
627 | if (ad->sk == NULL) { | |
628 | if ((ad->sk = sk_void_new_null()) == NULL) { | |
629 | CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA, ERR_R_MALLOC_FAILURE); | |
630 | return (0); | |
631 | } | |
632 | } | |
633 | i = sk_void_num(ad->sk); | |
634 | ||
635 | while (i <= idx) { | |
636 | if (!sk_void_push(ad->sk, NULL)) { | |
637 | CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA, ERR_R_MALLOC_FAILURE); | |
638 | return (0); | |
639 | } | |
640 | i++; | |
641 | } | |
642 | sk_void_set(ad->sk, idx, val); | |
643 | return (1); | |
644 | } | |
645 | ||
646 | /* | |
647 | * For a given CRYPTO_EX_DATA_ variable, get the value corresponding to a | |
648 | * particular index in the class used by this variable | |
649 | */ | |
bbbc96a8 | 650 | void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx) |
ae5c8664 MC |
651 | { |
652 | if (ad->sk == NULL) | |
653 | return (0); | |
654 | else if (idx >= sk_void_num(ad->sk)) | |
655 | return (0); | |
656 | else | |
657 | return (sk_void_value(ad->sk, idx)); | |
658 | } | |
58964a49 | 659 | |
dd9d233e | 660 | IMPLEMENT_STACK_OF(CRYPTO_EX_DATA_FUNCS) |