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0f113f3e MC |
1 | /* |
2 | * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project | |
3 | * 2001. | |
9391f977 GT |
4 | */ |
5 | /* ==================================================================== | |
2b671586 | 6 | * Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved. |
9391f977 GT |
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 | |
0f113f3e | 13 | * notice, this list of conditions and the following disclaimer. |
9391f977 GT |
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 | ||
14cfde9c | 59 | #include "eng_int.h" |
9391f977 GT |
60 | #include <openssl/dso.h> |
61 | ||
0f113f3e MC |
62 | /* |
63 | * Shared libraries implementing ENGINEs for use by the "dynamic" ENGINE | |
64 | * loader should implement the hook-up functions with the following | |
65 | * prototypes. | |
66 | */ | |
9391f977 GT |
67 | |
68 | /* Our ENGINE handlers */ | |
69 | static int dynamic_init(ENGINE *e); | |
70 | static int dynamic_finish(ENGINE *e); | |
0f113f3e MC |
71 | static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p, |
72 | void (*f) (void)); | |
9391f977 GT |
73 | /* Predeclare our context type */ |
74 | typedef struct st_dynamic_data_ctx dynamic_data_ctx; | |
75 | /* The implementation for the important control command */ | |
76 | static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx); | |
77 | ||
0f113f3e MC |
78 | #define DYNAMIC_CMD_SO_PATH ENGINE_CMD_BASE |
79 | #define DYNAMIC_CMD_NO_VCHECK (ENGINE_CMD_BASE + 1) | |
80 | #define DYNAMIC_CMD_ID (ENGINE_CMD_BASE + 2) | |
81 | #define DYNAMIC_CMD_LIST_ADD (ENGINE_CMD_BASE + 3) | |
82 | #define DYNAMIC_CMD_DIR_LOAD (ENGINE_CMD_BASE + 4) | |
83 | #define DYNAMIC_CMD_DIR_ADD (ENGINE_CMD_BASE + 5) | |
84 | #define DYNAMIC_CMD_LOAD (ENGINE_CMD_BASE + 6) | |
9391f977 GT |
85 | |
86 | /* The constants used when creating the ENGINE */ | |
87 | static const char *engine_dynamic_id = "dynamic"; | |
88 | static const char *engine_dynamic_name = "Dynamic engine loading support"; | |
89 | static const ENGINE_CMD_DEFN dynamic_cmd_defns[] = { | |
0f113f3e MC |
90 | {DYNAMIC_CMD_SO_PATH, |
91 | "SO_PATH", | |
92 | "Specifies the path to the new ENGINE shared library", | |
93 | ENGINE_CMD_FLAG_STRING}, | |
94 | {DYNAMIC_CMD_NO_VCHECK, | |
95 | "NO_VCHECK", | |
96 | "Specifies to continue even if version checking fails (boolean)", | |
97 | ENGINE_CMD_FLAG_NUMERIC}, | |
98 | {DYNAMIC_CMD_ID, | |
99 | "ID", | |
100 | "Specifies an ENGINE id name for loading", | |
101 | ENGINE_CMD_FLAG_STRING}, | |
102 | {DYNAMIC_CMD_LIST_ADD, | |
103 | "LIST_ADD", | |
104 | "Whether to add a loaded ENGINE to the internal list (0=no,1=yes,2=mandatory)", | |
105 | ENGINE_CMD_FLAG_NUMERIC}, | |
106 | {DYNAMIC_CMD_DIR_LOAD, | |
107 | "DIR_LOAD", | |
108 | "Specifies whether to load from 'DIR_ADD' directories (0=no,1=yes,2=mandatory)", | |
109 | ENGINE_CMD_FLAG_NUMERIC}, | |
110 | {DYNAMIC_CMD_DIR_ADD, | |
111 | "DIR_ADD", | |
112 | "Adds a directory from which ENGINEs can be loaded", | |
113 | ENGINE_CMD_FLAG_STRING}, | |
114 | {DYNAMIC_CMD_LOAD, | |
115 | "LOAD", | |
116 | "Load up the ENGINE specified by other settings", | |
117 | ENGINE_CMD_FLAG_NO_INPUT}, | |
118 | {0, NULL, NULL, 0} | |
119 | }; | |
9391f977 | 120 | |
0f113f3e MC |
121 | /* |
122 | * Loading code stores state inside the ENGINE structure via the "ex_data" | |
9391f977 | 123 | * element. We load all our state into a single structure and use that as a |
0f113f3e MC |
124 | * single context in the "ex_data" stack. |
125 | */ | |
126 | struct st_dynamic_data_ctx { | |
127 | /* The DSO object we load that supplies the ENGINE code */ | |
128 | DSO *dynamic_dso; | |
129 | /* | |
130 | * The function pointer to the version checking shared library function | |
131 | */ | |
132 | dynamic_v_check_fn v_check; | |
133 | /* | |
134 | * The function pointer to the engine-binding shared library function | |
135 | */ | |
136 | dynamic_bind_engine bind_engine; | |
137 | /* The default name/path for loading the shared library */ | |
b548a1f1 | 138 | char *DYNAMIC_LIBNAME; |
0f113f3e MC |
139 | /* Whether to continue loading on a version check failure */ |
140 | int no_vcheck; | |
141 | /* If non-NULL, stipulates the 'id' of the ENGINE to be loaded */ | |
b548a1f1 | 142 | char *engine_id; |
0f113f3e MC |
143 | /* |
144 | * If non-zero, a successfully loaded ENGINE should be added to the | |
145 | * internal ENGINE list. If 2, the add must succeed or the entire load | |
146 | * should fail. | |
147 | */ | |
148 | int list_add_value; | |
149 | /* The symbol name for the version checking function */ | |
150 | const char *DYNAMIC_F1; | |
151 | /* The symbol name for the "initialise ENGINE structure" function */ | |
152 | const char *DYNAMIC_F2; | |
153 | /* | |
154 | * Whether to never use 'dirs', use 'dirs' as a fallback, or only use | |
155 | * 'dirs' for loading. Default is to use 'dirs' as a fallback. | |
156 | */ | |
157 | int dir_load; | |
158 | /* A stack of directories from which ENGINEs could be loaded */ | |
159 | STACK_OF(OPENSSL_STRING) *dirs; | |
160 | }; | |
9391f977 | 161 | |
0f113f3e MC |
162 | /* |
163 | * This is the "ex_data" index we obtain and reserve for use with our context | |
164 | * structure. | |
165 | */ | |
9391f977 GT |
166 | static int dynamic_ex_data_idx = -1; |
167 | ||
0f113f3e MC |
168 | static void int_free_str(char *s) |
169 | { | |
170 | OPENSSL_free(s); | |
171 | } | |
172 | ||
173 | /* | |
174 | * Because our ex_data element may or may not get allocated depending on | |
175 | * whether a "first-use" occurs before the ENGINE is freed, we have a memory | |
176 | * leak problem to solve. We can't declare a "new" handler for the ex_data as | |
177 | * we don't want a dynamic_data_ctx in *all* ENGINE structures of all types | |
178 | * (this is a bug in the design of CRYPTO_EX_DATA). As such, we just declare | |
179 | * a "free" handler and that will get called if an ENGINE is being destroyed | |
180 | * and there was an ex_data element corresponding to our context type. | |
181 | */ | |
9391f977 | 182 | static void dynamic_data_ctx_free_func(void *parent, void *ptr, |
0f113f3e MC |
183 | CRYPTO_EX_DATA *ad, int idx, long argl, |
184 | void *argp) | |
185 | { | |
186 | if (ptr) { | |
187 | dynamic_data_ctx *ctx = (dynamic_data_ctx *)ptr; | |
efa7dd64 | 188 | DSO_free(ctx->dynamic_dso); |
b548a1f1 RS |
189 | OPENSSL_free(ctx->DYNAMIC_LIBNAME); |
190 | OPENSSL_free(ctx->engine_id); | |
25aaa98a | 191 | sk_OPENSSL_STRING_pop_free(ctx->dirs, int_free_str); |
0f113f3e MC |
192 | OPENSSL_free(ctx); |
193 | } | |
194 | } | |
9391f977 | 195 | |
0f113f3e MC |
196 | /* |
197 | * Construct the per-ENGINE context. We create it blindly and then use a lock | |
198 | * to check for a race - if so, all but one of the threads "racing" will have | |
9391f977 | 199 | * wasted their time. The alternative involves creating everything inside the |
0f113f3e MC |
200 | * lock which is far worse. |
201 | */ | |
9391f977 | 202 | static int dynamic_set_data_ctx(ENGINE *e, dynamic_data_ctx **ctx) |
0f113f3e | 203 | { |
b51bce94 | 204 | dynamic_data_ctx *c = OPENSSL_zalloc(sizeof(*c)); |
b4faea50 | 205 | |
90945fa3 | 206 | if (c == NULL) { |
0f113f3e MC |
207 | ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX, ERR_R_MALLOC_FAILURE); |
208 | return 0; | |
209 | } | |
0f113f3e | 210 | c->dirs = sk_OPENSSL_STRING_new_null(); |
90945fa3 | 211 | if (c->dirs == NULL) { |
0f113f3e MC |
212 | ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX, ERR_R_MALLOC_FAILURE); |
213 | OPENSSL_free(c); | |
214 | return 0; | |
215 | } | |
64b25758 RS |
216 | c->DYNAMIC_F1 = "v_check"; |
217 | c->DYNAMIC_F2 = "bind_engine"; | |
218 | c->dir_load = 1; | |
0f113f3e MC |
219 | CRYPTO_w_lock(CRYPTO_LOCK_ENGINE); |
220 | if ((*ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e, | |
221 | dynamic_ex_data_idx)) | |
222 | == NULL) { | |
223 | /* Good, we're the first */ | |
224 | ENGINE_set_ex_data(e, dynamic_ex_data_idx, c); | |
225 | *ctx = c; | |
226 | c = NULL; | |
227 | } | |
228 | CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE); | |
229 | /* | |
230 | * If we lost the race to set the context, c is non-NULL and *ctx is the | |
231 | * context of the thread that won. | |
232 | */ | |
98637bd3 F |
233 | if (c) |
234 | sk_OPENSSL_STRING_free(c->dirs); | |
b548a1f1 | 235 | OPENSSL_free(c); |
0f113f3e MC |
236 | return 1; |
237 | } | |
9391f977 | 238 | |
0f113f3e MC |
239 | /* |
240 | * This function retrieves the context structure from an ENGINE's "ex_data", | |
241 | * or if it doesn't exist yet, sets it up. | |
242 | */ | |
9391f977 | 243 | static dynamic_data_ctx *dynamic_get_data_ctx(ENGINE *e) |
0f113f3e MC |
244 | { |
245 | dynamic_data_ctx *ctx; | |
246 | if (dynamic_ex_data_idx < 0) { | |
247 | /* | |
248 | * Create and register the ENGINE ex_data, and associate our "free" | |
249 | * function with it to ensure any allocated contexts get freed when | |
250 | * an ENGINE goes underground. | |
251 | */ | |
252 | int new_idx = ENGINE_get_ex_new_index(0, NULL, NULL, NULL, | |
253 | dynamic_data_ctx_free_func); | |
254 | if (new_idx == -1) { | |
255 | ENGINEerr(ENGINE_F_DYNAMIC_GET_DATA_CTX, ENGINE_R_NO_INDEX); | |
256 | return NULL; | |
257 | } | |
258 | CRYPTO_w_lock(CRYPTO_LOCK_ENGINE); | |
259 | /* Avoid a race by checking again inside this lock */ | |
260 | if (dynamic_ex_data_idx < 0) { | |
261 | /* Good, someone didn't beat us to it */ | |
262 | dynamic_ex_data_idx = new_idx; | |
263 | new_idx = -1; | |
264 | } | |
265 | CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE); | |
266 | /* | |
267 | * In theory we could "give back" the index here if (new_idx>-1), but | |
268 | * it's not possible and wouldn't gain us much if it were. | |
269 | */ | |
270 | } | |
271 | ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e, dynamic_ex_data_idx); | |
272 | /* Check if the context needs to be created */ | |
273 | if ((ctx == NULL) && !dynamic_set_data_ctx(e, &ctx)) | |
274 | /* "set_data" will set errors if necessary */ | |
275 | return NULL; | |
276 | return ctx; | |
277 | } | |
9391f977 | 278 | |
b6d1e52d | 279 | static ENGINE *engine_dynamic(void) |
0f113f3e MC |
280 | { |
281 | ENGINE *ret = ENGINE_new(); | |
90945fa3 | 282 | if (ret == NULL) |
0f113f3e MC |
283 | return NULL; |
284 | if (!ENGINE_set_id(ret, engine_dynamic_id) || | |
285 | !ENGINE_set_name(ret, engine_dynamic_name) || | |
286 | !ENGINE_set_init_function(ret, dynamic_init) || | |
287 | !ENGINE_set_finish_function(ret, dynamic_finish) || | |
288 | !ENGINE_set_ctrl_function(ret, dynamic_ctrl) || | |
289 | !ENGINE_set_flags(ret, ENGINE_FLAGS_BY_ID_COPY) || | |
290 | !ENGINE_set_cmd_defns(ret, dynamic_cmd_defns)) { | |
291 | ENGINE_free(ret); | |
292 | return NULL; | |
293 | } | |
294 | return ret; | |
295 | } | |
9391f977 | 296 | |
b6d1e52d | 297 | void ENGINE_load_dynamic(void) |
0f113f3e MC |
298 | { |
299 | ENGINE *toadd = engine_dynamic(); | |
300 | if (!toadd) | |
301 | return; | |
302 | ENGINE_add(toadd); | |
303 | /* | |
304 | * If the "add" worked, it gets a structural reference. So either way, we | |
305 | * release our just-created reference. | |
306 | */ | |
307 | ENGINE_free(toadd); | |
308 | /* | |
309 | * If the "add" didn't work, it was probably a conflict because it was | |
310 | * already added (eg. someone calling ENGINE_load_blah then calling | |
311 | * ENGINE_load_builtin_engines() perhaps). | |
312 | */ | |
313 | ERR_clear_error(); | |
314 | } | |
b6d1e52d | 315 | |
9391f977 | 316 | static int dynamic_init(ENGINE *e) |
0f113f3e MC |
317 | { |
318 | /* | |
319 | * We always return failure - the "dyanamic" engine itself can't be used | |
320 | * for anything. | |
321 | */ | |
322 | return 0; | |
323 | } | |
9391f977 GT |
324 | |
325 | static int dynamic_finish(ENGINE *e) | |
0f113f3e MC |
326 | { |
327 | /* | |
328 | * This should never be called on account of "dynamic_init" always | |
329 | * failing. | |
330 | */ | |
331 | return 0; | |
332 | } | |
333 | ||
334 | static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) (void)) | |
335 | { | |
336 | dynamic_data_ctx *ctx = dynamic_get_data_ctx(e); | |
337 | int initialised; | |
9391f977 | 338 | |
0f113f3e MC |
339 | if (!ctx) { |
340 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_NOT_LOADED); | |
341 | return 0; | |
342 | } | |
343 | initialised = ((ctx->dynamic_dso == NULL) ? 0 : 1); | |
344 | /* All our control commands require the ENGINE to be uninitialised */ | |
345 | if (initialised) { | |
346 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_ALREADY_LOADED); | |
347 | return 0; | |
348 | } | |
349 | switch (cmd) { | |
350 | case DYNAMIC_CMD_SO_PATH: | |
351 | /* a NULL 'p' or a string of zero-length is the same thing */ | |
352 | if (p && (strlen((const char *)p) < 1)) | |
353 | p = NULL; | |
b548a1f1 | 354 | OPENSSL_free(ctx->DYNAMIC_LIBNAME); |
0f113f3e | 355 | if (p) |
7644a9ae | 356 | ctx->DYNAMIC_LIBNAME = OPENSSL_strdup(p); |
0f113f3e MC |
357 | else |
358 | ctx->DYNAMIC_LIBNAME = NULL; | |
359 | return (ctx->DYNAMIC_LIBNAME ? 1 : 0); | |
360 | case DYNAMIC_CMD_NO_VCHECK: | |
361 | ctx->no_vcheck = ((i == 0) ? 0 : 1); | |
362 | return 1; | |
363 | case DYNAMIC_CMD_ID: | |
364 | /* a NULL 'p' or a string of zero-length is the same thing */ | |
365 | if (p && (strlen((const char *)p) < 1)) | |
366 | p = NULL; | |
b548a1f1 | 367 | OPENSSL_free(ctx->engine_id); |
0f113f3e | 368 | if (p) |
7644a9ae | 369 | ctx->engine_id = OPENSSL_strdup(p); |
0f113f3e MC |
370 | else |
371 | ctx->engine_id = NULL; | |
372 | return (ctx->engine_id ? 1 : 0); | |
373 | case DYNAMIC_CMD_LIST_ADD: | |
374 | if ((i < 0) || (i > 2)) { | |
375 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT); | |
376 | return 0; | |
377 | } | |
378 | ctx->list_add_value = (int)i; | |
379 | return 1; | |
380 | case DYNAMIC_CMD_LOAD: | |
381 | return dynamic_load(e, ctx); | |
382 | case DYNAMIC_CMD_DIR_LOAD: | |
383 | if ((i < 0) || (i > 2)) { | |
384 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT); | |
385 | return 0; | |
386 | } | |
387 | ctx->dir_load = (int)i; | |
388 | return 1; | |
389 | case DYNAMIC_CMD_DIR_ADD: | |
390 | /* a NULL 'p' or a string of zero-length is the same thing */ | |
391 | if (!p || (strlen((const char *)p) < 1)) { | |
392 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT); | |
393 | return 0; | |
394 | } | |
395 | { | |
7644a9ae | 396 | char *tmp_str = OPENSSL_strdup(p); |
0f113f3e MC |
397 | if (!tmp_str) { |
398 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ERR_R_MALLOC_FAILURE); | |
399 | return 0; | |
400 | } | |
401 | sk_OPENSSL_STRING_insert(ctx->dirs, tmp_str, -1); | |
402 | } | |
403 | return 1; | |
404 | default: | |
405 | break; | |
406 | } | |
407 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED); | |
408 | return 0; | |
409 | } | |
9391f977 | 410 | |
02acf140 | 411 | static int int_load(dynamic_data_ctx *ctx) |
0f113f3e MC |
412 | { |
413 | int num, loop; | |
414 | /* Unless told not to, try a direct load */ | |
415 | if ((ctx->dir_load != 2) && (DSO_load(ctx->dynamic_dso, | |
416 | ctx->DYNAMIC_LIBNAME, NULL, | |
417 | 0)) != NULL) | |
418 | return 1; | |
419 | /* If we're not allowed to use 'dirs' or we have none, fail */ | |
420 | if (!ctx->dir_load || (num = sk_OPENSSL_STRING_num(ctx->dirs)) < 1) | |
421 | return 0; | |
422 | for (loop = 0; loop < num; loop++) { | |
423 | const char *s = sk_OPENSSL_STRING_value(ctx->dirs, loop); | |
424 | char *merge = DSO_merge(ctx->dynamic_dso, ctx->DYNAMIC_LIBNAME, s); | |
425 | if (!merge) | |
426 | return 0; | |
427 | if (DSO_load(ctx->dynamic_dso, merge, NULL, 0)) { | |
428 | /* Found what we're looking for */ | |
429 | OPENSSL_free(merge); | |
430 | return 1; | |
431 | } | |
432 | OPENSSL_free(merge); | |
433 | } | |
434 | return 0; | |
435 | } | |
02acf140 | 436 | |
9391f977 | 437 | static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx) |
0f113f3e MC |
438 | { |
439 | ENGINE cpy; | |
440 | dynamic_fns fns; | |
9391f977 | 441 | |
90945fa3 | 442 | if (ctx->dynamic_dso == NULL) |
0f113f3e | 443 | ctx->dynamic_dso = DSO_new(); |
90945fa3 MC |
444 | if (ctx->dynamic_dso == NULL) |
445 | return 0; | |
0f113f3e MC |
446 | if (!ctx->DYNAMIC_LIBNAME) { |
447 | if (!ctx->engine_id) | |
448 | return 0; | |
449 | ctx->DYNAMIC_LIBNAME = | |
450 | DSO_convert_filename(ctx->dynamic_dso, ctx->engine_id); | |
451 | } | |
452 | if (!int_load(ctx)) { | |
453 | ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_DSO_NOT_FOUND); | |
454 | DSO_free(ctx->dynamic_dso); | |
455 | ctx->dynamic_dso = NULL; | |
456 | return 0; | |
457 | } | |
458 | /* We have to find a bind function otherwise it'll always end badly */ | |
459 | if (! | |
460 | (ctx->bind_engine = | |
461 | (dynamic_bind_engine) DSO_bind_func(ctx->dynamic_dso, | |
462 | ctx->DYNAMIC_F2))) { | |
463 | ctx->bind_engine = NULL; | |
464 | DSO_free(ctx->dynamic_dso); | |
465 | ctx->dynamic_dso = NULL; | |
466 | ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_DSO_FAILURE); | |
467 | return 0; | |
468 | } | |
469 | /* Do we perform version checking? */ | |
470 | if (!ctx->no_vcheck) { | |
471 | unsigned long vcheck_res = 0; | |
472 | /* | |
473 | * Now we try to find a version checking function and decide how to | |
474 | * cope with failure if/when it fails. | |
475 | */ | |
476 | ctx->v_check = | |
477 | (dynamic_v_check_fn) DSO_bind_func(ctx->dynamic_dso, | |
478 | ctx->DYNAMIC_F1); | |
479 | if (ctx->v_check) | |
480 | vcheck_res = ctx->v_check(OSSL_DYNAMIC_VERSION); | |
481 | /* | |
482 | * We fail if the version checker veto'd the load *or* if it is | |
483 | * deferring to us (by returning its version) and we think it is too | |
484 | * old. | |
485 | */ | |
486 | if (vcheck_res < OSSL_DYNAMIC_OLDEST) { | |
487 | /* Fail */ | |
488 | ctx->bind_engine = NULL; | |
489 | ctx->v_check = NULL; | |
490 | DSO_free(ctx->dynamic_dso); | |
491 | ctx->dynamic_dso = NULL; | |
492 | ENGINEerr(ENGINE_F_DYNAMIC_LOAD, | |
493 | ENGINE_R_VERSION_INCOMPATIBILITY); | |
494 | return 0; | |
495 | } | |
496 | } | |
497 | /* | |
498 | * First binary copy the ENGINE structure so that we can roll back if the | |
499 | * hand-over fails | |
500 | */ | |
501 | memcpy(&cpy, e, sizeof(ENGINE)); | |
502 | /* | |
503 | * Provide the ERR, "ex_data", memory, and locking callbacks so the | |
504 | * loaded library uses our state rather than its own. FIXME: As noted in | |
505 | * engine.h, much of this would be simplified if each area of code | |
506 | * provided its own "summary" structure of all related callbacks. It | |
507 | * would also increase opaqueness. | |
508 | */ | |
509 | fns.static_state = ENGINE_get_static_state(); | |
0f113f3e MC |
510 | fns.lock_fns.lock_locking_cb = CRYPTO_get_locking_callback(); |
511 | fns.lock_fns.lock_add_lock_cb = CRYPTO_get_add_lock_callback(); | |
512 | fns.lock_fns.dynlock_create_cb = CRYPTO_get_dynlock_create_callback(); | |
513 | fns.lock_fns.dynlock_lock_cb = CRYPTO_get_dynlock_lock_callback(); | |
514 | fns.lock_fns.dynlock_destroy_cb = CRYPTO_get_dynlock_destroy_callback(); | |
515 | /* | |
516 | * Now that we've loaded the dynamic engine, make sure no "dynamic" | |
517 | * ENGINE elements will show through. | |
518 | */ | |
519 | engine_set_all_null(e); | |
5b8a57ec | 520 | |
0f113f3e MC |
521 | /* Try to bind the ENGINE onto our own ENGINE structure */ |
522 | if (!ctx->bind_engine(e, ctx->engine_id, &fns)) { | |
523 | ctx->bind_engine = NULL; | |
524 | ctx->v_check = NULL; | |
525 | DSO_free(ctx->dynamic_dso); | |
526 | ctx->dynamic_dso = NULL; | |
527 | ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_INIT_FAILED); | |
528 | /* Copy the original ENGINE structure back */ | |
529 | memcpy(e, &cpy, sizeof(ENGINE)); | |
530 | return 0; | |
531 | } | |
532 | /* Do we try to add this ENGINE to the internal list too? */ | |
533 | if (ctx->list_add_value > 0) { | |
534 | if (!ENGINE_add(e)) { | |
535 | /* Do we tolerate this or fail? */ | |
536 | if (ctx->list_add_value > 1) { | |
537 | /* | |
538 | * Fail - NB: By this time, it's too late to rollback, and | |
539 | * trying to do so allows the bind_engine() code to have | |
540 | * created leaks. We just have to fail where we are, after | |
541 | * the ENGINE has changed. | |
542 | */ | |
543 | ENGINEerr(ENGINE_F_DYNAMIC_LOAD, | |
544 | ENGINE_R_CONFLICTING_ENGINE_ID); | |
545 | return 0; | |
546 | } | |
547 | /* Tolerate */ | |
548 | ERR_clear_error(); | |
549 | } | |
550 | } | |
551 | return 1; | |
552 | } |