Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/engine/eng_dyn.c */ |
| 2 | /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL |
| 3 | * project 2001. |
| 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 | |
| 60 | #include "eng_int.h" |
| 61 | #include <openssl/dso.h> |
| 62 | |
| 63 | /* Shared libraries implementing ENGINEs for use by the "dynamic" ENGINE loader |
| 64 | * should implement the hook-up functions with the following prototypes. */ |
| 65 | |
| 66 | /* Our ENGINE handlers */ |
| 67 | static int dynamic_init(ENGINE *e); |
| 68 | static int dynamic_finish(ENGINE *e); |
| 69 | static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void)); |
| 70 | /* Predeclare our context type */ |
| 71 | typedef struct st_dynamic_data_ctx dynamic_data_ctx; |
| 72 | /* The implementation for the important control command */ |
| 73 | static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx); |
| 74 | |
| 75 | #define DYNAMIC_CMD_SO_PATH ENGINE_CMD_BASE |
| 76 | #define DYNAMIC_CMD_NO_VCHECK (ENGINE_CMD_BASE + 1) |
| 77 | #define DYNAMIC_CMD_ID (ENGINE_CMD_BASE + 2) |
| 78 | #define DYNAMIC_CMD_LIST_ADD (ENGINE_CMD_BASE + 3) |
| 79 | #define DYNAMIC_CMD_DIR_LOAD (ENGINE_CMD_BASE + 4) |
| 80 | #define DYNAMIC_CMD_DIR_ADD (ENGINE_CMD_BASE + 5) |
| 81 | #define DYNAMIC_CMD_LOAD (ENGINE_CMD_BASE + 6) |
| 82 | |
| 83 | /* The constants used when creating the ENGINE */ |
| 84 | static const char *engine_dynamic_id = "dynamic"; |
| 85 | static const char *engine_dynamic_name = "Dynamic engine loading support"; |
| 86 | static const ENGINE_CMD_DEFN dynamic_cmd_defns[] = { |
| 87 | {DYNAMIC_CMD_SO_PATH, |
| 88 | "SO_PATH", |
| 89 | "Specifies the path to the new ENGINE shared library", |
| 90 | ENGINE_CMD_FLAG_STRING}, |
| 91 | {DYNAMIC_CMD_NO_VCHECK, |
| 92 | "NO_VCHECK", |
| 93 | "Specifies to continue even if version checking fails (boolean)", |
| 94 | ENGINE_CMD_FLAG_NUMERIC}, |
| 95 | {DYNAMIC_CMD_ID, |
| 96 | "ID", |
| 97 | "Specifies an ENGINE id name for loading", |
| 98 | ENGINE_CMD_FLAG_STRING}, |
| 99 | {DYNAMIC_CMD_LIST_ADD, |
| 100 | "LIST_ADD", |
| 101 | "Whether to add a loaded ENGINE to the internal list (0=no,1=yes,2=mandatory)", |
| 102 | ENGINE_CMD_FLAG_NUMERIC}, |
| 103 | {DYNAMIC_CMD_DIR_LOAD, |
| 104 | "DIR_LOAD", |
| 105 | "Specifies whether to load from 'DIR_ADD' directories (0=no,1=yes,2=mandatory)", |
| 106 | ENGINE_CMD_FLAG_NUMERIC}, |
| 107 | {DYNAMIC_CMD_DIR_ADD, |
| 108 | "DIR_ADD", |
| 109 | "Adds a directory from which ENGINEs can be loaded", |
| 110 | ENGINE_CMD_FLAG_STRING}, |
| 111 | {DYNAMIC_CMD_LOAD, |
| 112 | "LOAD", |
| 113 | "Load up the ENGINE specified by other settings", |
| 114 | ENGINE_CMD_FLAG_NO_INPUT}, |
| 115 | {0, NULL, NULL, 0} |
| 116 | }; |
| 117 | static const ENGINE_CMD_DEFN dynamic_cmd_defns_empty[] = { |
| 118 | {0, NULL, NULL, 0} |
| 119 | }; |
| 120 | |
| 121 | /* Loading code stores state inside the ENGINE structure via the "ex_data" |
| 122 | * element. We load all our state into a single structure and use that as a |
| 123 | * single context in the "ex_data" stack. */ |
| 124 | struct st_dynamic_data_ctx |
| 125 | { |
| 126 | /* The DSO object we load that supplies the ENGINE code */ |
| 127 | DSO *dynamic_dso; |
| 128 | /* The function pointer to the version checking shared library function */ |
| 129 | dynamic_v_check_fn v_check; |
| 130 | /* The function pointer to the engine-binding shared library function */ |
| 131 | dynamic_bind_engine bind_engine; |
| 132 | /* The default name/path for loading the shared library */ |
| 133 | const char *DYNAMIC_LIBNAME; |
| 134 | /* Whether to continue loading on a version check failure */ |
| 135 | int no_vcheck; |
| 136 | /* If non-NULL, stipulates the 'id' of the ENGINE to be loaded */ |
| 137 | const char *engine_id; |
| 138 | /* If non-zero, a successfully loaded ENGINE should be added to the internal |
| 139 | * ENGINE list. If 2, the add must succeed or the entire load should fail. */ |
| 140 | int list_add_value; |
| 141 | /* The symbol name for the version checking function */ |
| 142 | const char *DYNAMIC_F1; |
| 143 | /* The symbol name for the "initialise ENGINE structure" function */ |
| 144 | const char *DYNAMIC_F2; |
| 145 | /* Whether to never use 'dirs', use 'dirs' as a fallback, or only use |
| 146 | * 'dirs' for loading. Default is to use 'dirs' as a fallback. */ |
| 147 | int dir_load; |
| 148 | /* A stack of directories from which ENGINEs could be loaded */ |
| 149 | STACK_OF(OPENSSL_STRING) *dirs; |
| 150 | }; |
| 151 | |
| 152 | /* This is the "ex_data" index we obtain and reserve for use with our context |
| 153 | * structure. */ |
| 154 | static int dynamic_ex_data_idx = -1; |
| 155 | |
| 156 | static void int_free_str(char *s) { OPENSSL_free(s); } |
| 157 | /* Because our ex_data element may or may not get allocated depending on whether |
| 158 | * a "first-use" occurs before the ENGINE is freed, we have a memory leak |
| 159 | * problem to solve. We can't declare a "new" handler for the ex_data as we |
| 160 | * don't want a dynamic_data_ctx in *all* ENGINE structures of all types (this |
| 161 | * is a bug in the design of CRYPTO_EX_DATA). As such, we just declare a "free" |
| 162 | * handler and that will get called if an ENGINE is being destroyed and there |
| 163 | * was an ex_data element corresponding to our context type. */ |
| 164 | static void dynamic_data_ctx_free_func(void *parent, void *ptr, |
| 165 | CRYPTO_EX_DATA *ad, int idx, long argl, void *argp) |
| 166 | { |
| 167 | if(ptr) |
| 168 | { |
| 169 | dynamic_data_ctx *ctx = (dynamic_data_ctx *)ptr; |
| 170 | if(ctx->dynamic_dso) |
| 171 | DSO_free(ctx->dynamic_dso); |
| 172 | if(ctx->DYNAMIC_LIBNAME) |
| 173 | OPENSSL_free((void*)ctx->DYNAMIC_LIBNAME); |
| 174 | if(ctx->engine_id) |
| 175 | OPENSSL_free((void*)ctx->engine_id); |
| 176 | if(ctx->dirs) |
| 177 | sk_OPENSSL_STRING_pop_free(ctx->dirs, int_free_str); |
| 178 | OPENSSL_free(ctx); |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | /* Construct the per-ENGINE context. We create it blindly and then use a lock to |
| 183 | * check for a race - if so, all but one of the threads "racing" will have |
| 184 | * wasted their time. The alternative involves creating everything inside the |
| 185 | * lock which is far worse. */ |
| 186 | static int dynamic_set_data_ctx(ENGINE *e, dynamic_data_ctx **ctx) |
| 187 | { |
| 188 | dynamic_data_ctx *c; |
| 189 | c = OPENSSL_malloc(sizeof(dynamic_data_ctx)); |
| 190 | if(!c) |
| 191 | { |
| 192 | ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX,ERR_R_MALLOC_FAILURE); |
| 193 | return 0; |
| 194 | } |
| 195 | memset(c, 0, sizeof(dynamic_data_ctx)); |
| 196 | c->dynamic_dso = NULL; |
| 197 | c->v_check = NULL; |
| 198 | c->bind_engine = NULL; |
| 199 | c->DYNAMIC_LIBNAME = NULL; |
| 200 | c->no_vcheck = 0; |
| 201 | c->engine_id = NULL; |
| 202 | c->list_add_value = 0; |
| 203 | c->DYNAMIC_F1 = "v_check"; |
| 204 | c->DYNAMIC_F2 = "bind_engine"; |
| 205 | c->dir_load = 1; |
| 206 | c->dirs = sk_OPENSSL_STRING_new_null(); |
| 207 | if(!c->dirs) |
| 208 | { |
| 209 | ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX,ERR_R_MALLOC_FAILURE); |
| 210 | OPENSSL_free(c); |
| 211 | return 0; |
| 212 | } |
| 213 | CRYPTO_w_lock(CRYPTO_LOCK_ENGINE); |
| 214 | if((*ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e, |
| 215 | dynamic_ex_data_idx)) == NULL) |
| 216 | { |
| 217 | /* Good, we're the first */ |
| 218 | ENGINE_set_ex_data(e, dynamic_ex_data_idx, c); |
| 219 | *ctx = c; |
| 220 | c = NULL; |
| 221 | } |
| 222 | CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE); |
| 223 | /* If we lost the race to set the context, c is non-NULL and *ctx is the |
| 224 | * context of the thread that won. */ |
| 225 | if(c) |
| 226 | OPENSSL_free(c); |
| 227 | return 1; |
| 228 | } |
| 229 | |
| 230 | /* This function retrieves the context structure from an ENGINE's "ex_data", or |
| 231 | * if it doesn't exist yet, sets it up. */ |
| 232 | static dynamic_data_ctx *dynamic_get_data_ctx(ENGINE *e) |
| 233 | { |
| 234 | dynamic_data_ctx *ctx; |
| 235 | if(dynamic_ex_data_idx < 0) |
| 236 | { |
| 237 | /* Create and register the ENGINE ex_data, and associate our |
| 238 | * "free" function with it to ensure any allocated contexts get |
| 239 | * freed when an ENGINE goes underground. */ |
| 240 | int new_idx = ENGINE_get_ex_new_index(0, NULL, NULL, NULL, |
| 241 | dynamic_data_ctx_free_func); |
| 242 | if(new_idx == -1) |
| 243 | { |
| 244 | ENGINEerr(ENGINE_F_DYNAMIC_GET_DATA_CTX,ENGINE_R_NO_INDEX); |
| 245 | return NULL; |
| 246 | } |
| 247 | CRYPTO_w_lock(CRYPTO_LOCK_ENGINE); |
| 248 | /* Avoid a race by checking again inside this lock */ |
| 249 | if(dynamic_ex_data_idx < 0) |
| 250 | { |
| 251 | /* Good, someone didn't beat us to it */ |
| 252 | dynamic_ex_data_idx = new_idx; |
| 253 | new_idx = -1; |
| 254 | } |
| 255 | CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE); |
| 256 | /* In theory we could "give back" the index here if |
| 257 | * (new_idx>-1), but it's not possible and wouldn't gain us much |
| 258 | * if it were. */ |
| 259 | } |
| 260 | ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e, dynamic_ex_data_idx); |
| 261 | /* Check if the context needs to be created */ |
| 262 | if((ctx == NULL) && !dynamic_set_data_ctx(e, &ctx)) |
| 263 | /* "set_data" will set errors if necessary */ |
| 264 | return NULL; |
| 265 | return ctx; |
| 266 | } |
| 267 | |
| 268 | static ENGINE *engine_dynamic(void) |
| 269 | { |
| 270 | ENGINE *ret = ENGINE_new(); |
| 271 | if(!ret) |
| 272 | return NULL; |
| 273 | if(!ENGINE_set_id(ret, engine_dynamic_id) || |
| 274 | !ENGINE_set_name(ret, engine_dynamic_name) || |
| 275 | !ENGINE_set_init_function(ret, dynamic_init) || |
| 276 | !ENGINE_set_finish_function(ret, dynamic_finish) || |
| 277 | !ENGINE_set_ctrl_function(ret, dynamic_ctrl) || |
| 278 | !ENGINE_set_flags(ret, ENGINE_FLAGS_BY_ID_COPY) || |
| 279 | !ENGINE_set_cmd_defns(ret, dynamic_cmd_defns)) |
| 280 | { |
| 281 | ENGINE_free(ret); |
| 282 | return NULL; |
| 283 | } |
| 284 | return ret; |
| 285 | } |
| 286 | |
| 287 | void ENGINE_load_dynamic(void) |
| 288 | { |
| 289 | ENGINE *toadd = engine_dynamic(); |
| 290 | if(!toadd) return; |
| 291 | ENGINE_add(toadd); |
| 292 | /* If the "add" worked, it gets a structural reference. So either way, |
| 293 | * we release our just-created reference. */ |
| 294 | ENGINE_free(toadd); |
| 295 | /* If the "add" didn't work, it was probably a conflict because it was |
| 296 | * already added (eg. someone calling ENGINE_load_blah then calling |
| 297 | * ENGINE_load_builtin_engines() perhaps). */ |
| 298 | ERR_clear_error(); |
| 299 | } |
| 300 | |
| 301 | static int dynamic_init(ENGINE *e) |
| 302 | { |
| 303 | /* We always return failure - the "dyanamic" engine itself can't be used |
| 304 | * for anything. */ |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | static int dynamic_finish(ENGINE *e) |
| 309 | { |
| 310 | /* This should never be called on account of "dynamic_init" always |
| 311 | * failing. */ |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void)) |
| 316 | { |
| 317 | dynamic_data_ctx *ctx = dynamic_get_data_ctx(e); |
| 318 | int initialised; |
| 319 | |
| 320 | if(!ctx) |
| 321 | { |
| 322 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL,ENGINE_R_NOT_LOADED); |
| 323 | return 0; |
| 324 | } |
| 325 | initialised = ((ctx->dynamic_dso == NULL) ? 0 : 1); |
| 326 | /* All our control commands require the ENGINE to be uninitialised */ |
| 327 | if(initialised) |
| 328 | { |
| 329 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL, |
| 330 | ENGINE_R_ALREADY_LOADED); |
| 331 | return 0; |
| 332 | } |
| 333 | switch(cmd) |
| 334 | { |
| 335 | case DYNAMIC_CMD_SO_PATH: |
| 336 | /* a NULL 'p' or a string of zero-length is the same thing */ |
| 337 | if(p && (strlen((const char *)p) < 1)) |
| 338 | p = NULL; |
| 339 | if(ctx->DYNAMIC_LIBNAME) |
| 340 | OPENSSL_free((void*)ctx->DYNAMIC_LIBNAME); |
| 341 | if(p) |
| 342 | ctx->DYNAMIC_LIBNAME = BUF_strdup(p); |
| 343 | else |
| 344 | ctx->DYNAMIC_LIBNAME = NULL; |
| 345 | return (ctx->DYNAMIC_LIBNAME ? 1 : 0); |
| 346 | case DYNAMIC_CMD_NO_VCHECK: |
| 347 | ctx->no_vcheck = ((i == 0) ? 0 : 1); |
| 348 | return 1; |
| 349 | case DYNAMIC_CMD_ID: |
| 350 | /* a NULL 'p' or a string of zero-length is the same thing */ |
| 351 | if(p && (strlen((const char *)p) < 1)) |
| 352 | p = NULL; |
| 353 | if(ctx->engine_id) |
| 354 | OPENSSL_free((void*)ctx->engine_id); |
| 355 | if(p) |
| 356 | ctx->engine_id = BUF_strdup(p); |
| 357 | else |
| 358 | ctx->engine_id = NULL; |
| 359 | return (ctx->engine_id ? 1 : 0); |
| 360 | case DYNAMIC_CMD_LIST_ADD: |
| 361 | if((i < 0) || (i > 2)) |
| 362 | { |
| 363 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL, |
| 364 | ENGINE_R_INVALID_ARGUMENT); |
| 365 | return 0; |
| 366 | } |
| 367 | ctx->list_add_value = (int)i; |
| 368 | return 1; |
| 369 | case DYNAMIC_CMD_LOAD: |
| 370 | return dynamic_load(e, ctx); |
| 371 | case DYNAMIC_CMD_DIR_LOAD: |
| 372 | if((i < 0) || (i > 2)) |
| 373 | { |
| 374 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL, |
| 375 | ENGINE_R_INVALID_ARGUMENT); |
| 376 | return 0; |
| 377 | } |
| 378 | ctx->dir_load = (int)i; |
| 379 | return 1; |
| 380 | case DYNAMIC_CMD_DIR_ADD: |
| 381 | /* a NULL 'p' or a string of zero-length is the same thing */ |
| 382 | if(!p || (strlen((const char *)p) < 1)) |
| 383 | { |
| 384 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL, |
| 385 | ENGINE_R_INVALID_ARGUMENT); |
| 386 | return 0; |
| 387 | } |
| 388 | { |
| 389 | char *tmp_str = BUF_strdup(p); |
| 390 | if(!tmp_str) |
| 391 | { |
| 392 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL, |
| 393 | ERR_R_MALLOC_FAILURE); |
| 394 | return 0; |
| 395 | } |
| 396 | sk_OPENSSL_STRING_insert(ctx->dirs, tmp_str, -1); |
| 397 | } |
| 398 | return 1; |
| 399 | default: |
| 400 | break; |
| 401 | } |
| 402 | ENGINEerr(ENGINE_F_DYNAMIC_CTRL,ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED); |
| 403 | return 0; |
| 404 | } |
| 405 | |
| 406 | static int int_load(dynamic_data_ctx *ctx) |
| 407 | { |
| 408 | int num, loop; |
| 409 | /* Unless told not to, try a direct load */ |
| 410 | if((ctx->dir_load != 2) && (DSO_load(ctx->dynamic_dso, |
| 411 | ctx->DYNAMIC_LIBNAME, NULL, 0)) != NULL) |
| 412 | return 1; |
| 413 | /* If we're not allowed to use 'dirs' or we have none, fail */ |
| 414 | if(!ctx->dir_load || (num = sk_OPENSSL_STRING_num(ctx->dirs)) < 1) |
| 415 | return 0; |
| 416 | for(loop = 0; loop < num; loop++) |
| 417 | { |
| 418 | const char *s = sk_OPENSSL_STRING_value(ctx->dirs, loop); |
| 419 | char *merge = DSO_merge(ctx->dynamic_dso, ctx->DYNAMIC_LIBNAME, s); |
| 420 | if(!merge) |
| 421 | return 0; |
| 422 | if(DSO_load(ctx->dynamic_dso, merge, NULL, 0)) |
| 423 | { |
| 424 | /* Found what we're looking for */ |
| 425 | OPENSSL_free(merge); |
| 426 | return 1; |
| 427 | } |
| 428 | OPENSSL_free(merge); |
| 429 | } |
| 430 | return 0; |
| 431 | } |
| 432 | |
| 433 | static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx) |
| 434 | { |
| 435 | ENGINE cpy; |
| 436 | dynamic_fns fns; |
| 437 | |
| 438 | if(!ctx->dynamic_dso) |
| 439 | ctx->dynamic_dso = DSO_new(); |
| 440 | if(!ctx->DYNAMIC_LIBNAME) |
| 441 | { |
| 442 | if(!ctx->engine_id) |
| 443 | return 0; |
| 444 | ctx->DYNAMIC_LIBNAME = |
| 445 | DSO_convert_filename(ctx->dynamic_dso, ctx->engine_id); |
| 446 | } |
| 447 | if(!int_load(ctx)) |
| 448 | { |
| 449 | ENGINEerr(ENGINE_F_DYNAMIC_LOAD, |
| 450 | ENGINE_R_DSO_NOT_FOUND); |
| 451 | DSO_free(ctx->dynamic_dso); |
| 452 | ctx->dynamic_dso = NULL; |
| 453 | return 0; |
| 454 | } |
| 455 | /* We have to find a bind function otherwise it'll always end badly */ |
| 456 | if(!(ctx->bind_engine = (dynamic_bind_engine)DSO_bind_func( |
| 457 | ctx->dynamic_dso, ctx->DYNAMIC_F2))) |
| 458 | { |
| 459 | ctx->bind_engine = NULL; |
| 460 | DSO_free(ctx->dynamic_dso); |
| 461 | ctx->dynamic_dso = NULL; |
| 462 | ENGINEerr(ENGINE_F_DYNAMIC_LOAD, |
| 463 | ENGINE_R_DSO_FAILURE); |
| 464 | return 0; |
| 465 | } |
| 466 | /* Do we perform version checking? */ |
| 467 | if(!ctx->no_vcheck) |
| 468 | { |
| 469 | unsigned long vcheck_res = 0; |
| 470 | /* Now we try to find a version checking function and decide how |
| 471 | * to cope with failure if/when it fails. */ |
| 472 | ctx->v_check = (dynamic_v_check_fn)DSO_bind_func( |
| 473 | ctx->dynamic_dso, ctx->DYNAMIC_F1); |
| 474 | if(ctx->v_check) |
| 475 | vcheck_res = ctx->v_check(OSSL_DYNAMIC_VERSION); |
| 476 | /* We fail if the version checker veto'd the load *or* if it is |
| 477 | * deferring to us (by returning its version) and we think it is |
| 478 | * too old. */ |
| 479 | if(vcheck_res < OSSL_DYNAMIC_OLDEST) |
| 480 | { |
| 481 | /* Fail */ |
| 482 | ctx->bind_engine = NULL; |
| 483 | ctx->v_check = NULL; |
| 484 | DSO_free(ctx->dynamic_dso); |
| 485 | ctx->dynamic_dso = NULL; |
| 486 | ENGINEerr(ENGINE_F_DYNAMIC_LOAD, |
| 487 | ENGINE_R_VERSION_INCOMPATIBILITY); |
| 488 | return 0; |
| 489 | } |
| 490 | } |
| 491 | /* First binary copy the ENGINE structure so that we can roll back if |
| 492 | * the hand-over fails */ |
| 493 | memcpy(&cpy, e, sizeof(ENGINE)); |
| 494 | /* Provide the ERR, "ex_data", memory, and locking callbacks so the |
| 495 | * loaded library uses our state rather than its own. FIXME: As noted in |
| 496 | * engine.h, much of this would be simplified if each area of code |
| 497 | * provided its own "summary" structure of all related callbacks. It |
| 498 | * would also increase opaqueness. */ |
| 499 | fns.static_state = ENGINE_get_static_state(); |
| 500 | fns.err_fns = ERR_get_implementation(); |
| 501 | fns.ex_data_fns = CRYPTO_get_ex_data_implementation(); |
| 502 | CRYPTO_get_mem_functions(&fns.mem_fns.malloc_cb, |
| 503 | &fns.mem_fns.realloc_cb, |
| 504 | &fns.mem_fns.free_cb); |
| 505 | fns.lock_fns.lock_locking_cb = CRYPTO_get_locking_callback(); |
| 506 | fns.lock_fns.lock_add_lock_cb = CRYPTO_get_add_lock_callback(); |
| 507 | fns.lock_fns.dynlock_create_cb = CRYPTO_get_dynlock_create_callback(); |
| 508 | fns.lock_fns.dynlock_lock_cb = CRYPTO_get_dynlock_lock_callback(); |
| 509 | fns.lock_fns.dynlock_destroy_cb = CRYPTO_get_dynlock_destroy_callback(); |
| 510 | /* Now that we've loaded the dynamic engine, make sure no "dynamic" |
| 511 | * ENGINE elements will show through. */ |
| 512 | engine_set_all_null(e); |
| 513 | |
| 514 | /* Try to bind the ENGINE onto our own ENGINE structure */ |
| 515 | if(!ctx->bind_engine(e, ctx->engine_id, &fns)) |
| 516 | { |
| 517 | ctx->bind_engine = NULL; |
| 518 | ctx->v_check = NULL; |
| 519 | DSO_free(ctx->dynamic_dso); |
| 520 | ctx->dynamic_dso = NULL; |
| 521 | ENGINEerr(ENGINE_F_DYNAMIC_LOAD,ENGINE_R_INIT_FAILED); |
| 522 | /* Copy the original ENGINE structure back */ |
| 523 | memcpy(e, &cpy, sizeof(ENGINE)); |
| 524 | return 0; |
| 525 | } |
| 526 | /* Do we try to add this ENGINE to the internal list too? */ |
| 527 | if(ctx->list_add_value > 0) |
| 528 | { |
| 529 | if(!ENGINE_add(e)) |
| 530 | { |
| 531 | /* Do we tolerate this or fail? */ |
| 532 | if(ctx->list_add_value > 1) |
| 533 | { |
| 534 | /* Fail - NB: By this time, it's too late to |
| 535 | * rollback, and trying to do so allows the |
| 536 | * bind_engine() code to have created leaks. We |
| 537 | * just have to fail where we are, after the |
| 538 | * ENGINE has changed. */ |
| 539 | ENGINEerr(ENGINE_F_DYNAMIC_LOAD, |
| 540 | ENGINE_R_CONFLICTING_ENGINE_ID); |
| 541 | return 0; |
| 542 | } |
| 543 | /* Tolerate */ |
| 544 | ERR_clear_error(); |
| 545 | } |
| 546 | } |
| 547 | return 1; |
| 548 | } |