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-rw-r--r--src/lib/libcrypto/engine/eng_list.c396
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diff --git a/src/lib/libcrypto/engine/eng_list.c b/src/lib/libcrypto/engine/eng_list.c
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1/* $OpenBSD: eng_list.c,v 1.21 2015/07/19 00:56:48 bcook Exp $ */
2/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
3 * project 2000.
4 */
5/* ====================================================================
6 * Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58/* ====================================================================
59 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
60 * ECDH support in OpenSSL originally developed by
61 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
62 */
63
64#include <string.h>
65#include <unistd.h>
66
67#include <openssl/opensslconf.h>
68
69#include <openssl/err.h>
70
71#include "cryptlib.h"
72#include "eng_int.h"
73
74/* The linked-list of pointers to engine types. engine_list_head
75 * incorporates an implicit structural reference but engine_list_tail
76 * does not - the latter is a computational niceity and only points
77 * to something that is already pointed to by its predecessor in the
78 * list (or engine_list_head itself). In the same way, the use of the
79 * "prev" pointer in each ENGINE is to save excessive list iteration,
80 * it doesn't correspond to an extra structural reference. Hence,
81 * engine_list_head, and each non-null "next" pointer account for
82 * the list itself assuming exactly 1 structural reference on each
83 * list member. */
84static ENGINE *engine_list_head = NULL;
85static ENGINE *engine_list_tail = NULL;
86
87/* This cleanup function is only needed internally. If it should be called, we
88 * register it with the "ENGINE_cleanup()" stack to be called during cleanup. */
89
90static void
91engine_list_cleanup(void)
92{
93 ENGINE *iterator = engine_list_head;
94
95 while (iterator != NULL && ENGINE_remove(iterator))
96 iterator = engine_list_head;
97}
98
99/* These static functions starting with a lower case "engine_" always
100 * take place when CRYPTO_LOCK_ENGINE has been locked up. */
101static int
102engine_list_add(ENGINE *e)
103{
104 int conflict = 0;
105 ENGINE *iterator = NULL;
106
107 if (e == NULL) {
108 ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
109 ERR_R_PASSED_NULL_PARAMETER);
110 return 0;
111 }
112 iterator = engine_list_head;
113 while (iterator && !conflict) {
114 conflict = (strcmp(iterator->id, e->id) == 0);
115 iterator = iterator->next;
116 }
117 if (conflict) {
118 ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
119 ENGINE_R_CONFLICTING_ENGINE_ID);
120 return 0;
121 }
122 if (engine_list_head == NULL) {
123 /* We are adding to an empty list. */
124 if (engine_list_tail) {
125 ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
126 ENGINE_R_INTERNAL_LIST_ERROR);
127 return 0;
128 }
129 engine_list_head = e;
130 e->prev = NULL;
131 /* The first time the list allocates, we should register the
132 * cleanup. */
133 engine_cleanup_add_last(engine_list_cleanup);
134 } else {
135 /* We are adding to the tail of an existing list. */
136 if ((engine_list_tail == NULL) ||
137 (engine_list_tail->next != NULL)) {
138 ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
139 ENGINE_R_INTERNAL_LIST_ERROR);
140 return 0;
141 }
142 engine_list_tail->next = e;
143 e->prev = engine_list_tail;
144 }
145 /* Having the engine in the list assumes a structural
146 * reference. */
147 e->struct_ref++;
148 engine_ref_debug(e, 0, 1)
149 /* However it came to be, e is the last item in the list. */
150 engine_list_tail = e;
151 e->next = NULL;
152 return 1;
153}
154
155static int
156engine_list_remove(ENGINE *e)
157{
158 ENGINE *iterator;
159
160 if (e == NULL) {
161 ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE,
162 ERR_R_PASSED_NULL_PARAMETER);
163 return 0;
164 }
165 /* We need to check that e is in our linked list! */
166 iterator = engine_list_head;
167 while (iterator && (iterator != e))
168 iterator = iterator->next;
169 if (iterator == NULL) {
170 ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE,
171 ENGINE_R_ENGINE_IS_NOT_IN_LIST);
172 return 0;
173 }
174 /* un-link e from the chain. */
175 if (e->next)
176 e->next->prev = e->prev;
177 if (e->prev)
178 e->prev->next = e->next;
179 /* Correct our head/tail if necessary. */
180 if (engine_list_head == e)
181 engine_list_head = e->next;
182 if (engine_list_tail == e)
183 engine_list_tail = e->prev;
184 engine_free_util(e, 0);
185 return 1;
186}
187
188/* Get the first/last "ENGINE" type available. */
189ENGINE *
190ENGINE_get_first(void)
191{
192 ENGINE *ret;
193
194 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
195 ret = engine_list_head;
196 if (ret) {
197 ret->struct_ref++;
198 engine_ref_debug(ret, 0, 1)
199 }
200 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
201 return ret;
202}
203
204ENGINE *
205ENGINE_get_last(void)
206{
207 ENGINE *ret;
208
209 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
210 ret = engine_list_tail;
211 if (ret) {
212 ret->struct_ref++;
213 engine_ref_debug(ret, 0, 1)
214 }
215 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
216 return ret;
217}
218
219/* Iterate to the next/previous "ENGINE" type (NULL = end of the list). */
220ENGINE *
221ENGINE_get_next(ENGINE *e)
222{
223 ENGINE *ret = NULL;
224
225 if (e == NULL) {
226 ENGINEerr(ENGINE_F_ENGINE_GET_NEXT,
227 ERR_R_PASSED_NULL_PARAMETER);
228 return 0;
229 }
230 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
231 ret = e->next;
232 if (ret) {
233 /* Return a valid structural refernce to the next ENGINE */
234 ret->struct_ref++;
235 engine_ref_debug(ret, 0, 1)
236 }
237 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
238 /* Release the structural reference to the previous ENGINE */
239 ENGINE_free(e);
240 return ret;
241}
242
243ENGINE *
244ENGINE_get_prev(ENGINE *e)
245{
246 ENGINE *ret = NULL;
247
248 if (e == NULL) {
249 ENGINEerr(ENGINE_F_ENGINE_GET_PREV,
250 ERR_R_PASSED_NULL_PARAMETER);
251 return 0;
252 }
253 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
254 ret = e->prev;
255 if (ret) {
256 /* Return a valid structural reference to the next ENGINE */
257 ret->struct_ref++;
258 engine_ref_debug(ret, 0, 1)
259 }
260 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
261 /* Release the structural reference to the previous ENGINE */
262 ENGINE_free(e);
263 return ret;
264}
265
266/* Add another "ENGINE" type into the list. */
267int
268ENGINE_add(ENGINE *e)
269{
270 int to_return = 1;
271
272 if (e == NULL) {
273 ENGINEerr(ENGINE_F_ENGINE_ADD,
274 ERR_R_PASSED_NULL_PARAMETER);
275 return 0;
276 }
277 if ((e->id == NULL) || (e->name == NULL)) {
278 ENGINEerr(ENGINE_F_ENGINE_ADD,
279 ENGINE_R_ID_OR_NAME_MISSING);
280 }
281 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
282 if (!engine_list_add(e)) {
283 ENGINEerr(ENGINE_F_ENGINE_ADD,
284 ENGINE_R_INTERNAL_LIST_ERROR);
285 to_return = 0;
286 }
287 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
288 return to_return;
289}
290
291/* Remove an existing "ENGINE" type from the array. */
292int
293ENGINE_remove(ENGINE *e)
294{
295 int to_return = 1;
296
297 if (e == NULL) {
298 ENGINEerr(ENGINE_F_ENGINE_REMOVE,
299 ERR_R_PASSED_NULL_PARAMETER);
300 return 0;
301 }
302 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
303 if (!engine_list_remove(e)) {
304 ENGINEerr(ENGINE_F_ENGINE_REMOVE,
305 ENGINE_R_INTERNAL_LIST_ERROR);
306 to_return = 0;
307 }
308 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
309 return to_return;
310}
311
312static void
313engine_cpy(ENGINE *dest, const ENGINE *src)
314{
315 dest->id = src->id;
316 dest->name = src->name;
317#ifndef OPENSSL_NO_RSA
318 dest->rsa_meth = src->rsa_meth;
319#endif
320#ifndef OPENSSL_NO_DSA
321 dest->dsa_meth = src->dsa_meth;
322#endif
323#ifndef OPENSSL_NO_DH
324 dest->dh_meth = src->dh_meth;
325#endif
326#ifndef OPENSSL_NO_ECDH
327 dest->ecdh_meth = src->ecdh_meth;
328#endif
329#ifndef OPENSSL_NO_ECDSA
330 dest->ecdsa_meth = src->ecdsa_meth;
331#endif
332 dest->rand_meth = src->rand_meth;
333 dest->store_meth = src->store_meth;
334 dest->ciphers = src->ciphers;
335 dest->digests = src->digests;
336 dest->pkey_meths = src->pkey_meths;
337 dest->destroy = src->destroy;
338 dest->init = src->init;
339 dest->finish = src->finish;
340 dest->ctrl = src->ctrl;
341 dest->load_privkey = src->load_privkey;
342 dest->load_pubkey = src->load_pubkey;
343 dest->cmd_defns = src->cmd_defns;
344 dest->flags = src->flags;
345}
346
347ENGINE *
348ENGINE_by_id(const char *id)
349{
350 ENGINE *iterator;
351
352 if (id == NULL) {
353 ENGINEerr(ENGINE_F_ENGINE_BY_ID,
354 ERR_R_PASSED_NULL_PARAMETER);
355 return NULL;
356 }
357 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
358 iterator = engine_list_head;
359 while (iterator && (strcmp(id, iterator->id) != 0))
360 iterator = iterator->next;
361 if (iterator) {
362 /* We need to return a structural reference. If this is an
363 * ENGINE type that returns copies, make a duplicate - otherwise
364 * increment the existing ENGINE's reference count. */
365 if (iterator->flags & ENGINE_FLAGS_BY_ID_COPY) {
366 ENGINE *cp = ENGINE_new();
367 if (!cp)
368 iterator = NULL;
369 else {
370 engine_cpy(cp, iterator);
371 iterator = cp;
372 }
373 } else {
374 iterator->struct_ref++;
375 engine_ref_debug(iterator, 0, 1)
376 }
377 }
378 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
379
380 if (iterator == NULL) {
381 ENGINEerr(ENGINE_F_ENGINE_BY_ID, ENGINE_R_NO_SUCH_ENGINE);
382 ERR_asprintf_error_data("id=%s", id);
383 }
384 return iterator;
385}
386
387int
388ENGINE_up_ref(ENGINE *e)
389{
390 if (e == NULL) {
391 ENGINEerr(ENGINE_F_ENGINE_UP_REF, ERR_R_PASSED_NULL_PARAMETER);
392 return 0;
393 }
394 CRYPTO_add(&e->struct_ref, 1, CRYPTO_LOCK_ENGINE);
395 return 1;
396}
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