1 /* $OpenBSD: dso_lib.c,v 1.17 2014/07/10 13:58:22 jsing Exp $ */ 2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL 3 * project 2000. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2000 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 #include <stdio.h> 60 #include <string.h> 61 62 #include <openssl/crypto.h> 63 #include <openssl/dso.h> 64 #include <openssl/err.h> 65 66 static DSO_METHOD *default_DSO_meth = NULL; 67 68 DSO * 69 DSO_new(void) 70 { 71 return (DSO_new_method(NULL)); 72 } 73 74 void 75 DSO_set_default_method(DSO_METHOD *meth) 76 { 77 default_DSO_meth = meth; 78 } 79 80 DSO_METHOD * 81 DSO_get_default_method(void) 82 { 83 return (default_DSO_meth); 84 } 85 86 DSO_METHOD * 87 DSO_get_method(DSO *dso) 88 { 89 return (dso->meth); 90 } 91 92 DSO_METHOD * 93 DSO_set_method(DSO *dso, DSO_METHOD *meth) 94 { 95 DSO_METHOD *mtmp; 96 97 mtmp = dso->meth; 98 dso->meth = meth; 99 return (mtmp); 100 } 101 102 DSO * 103 DSO_new_method(DSO_METHOD *meth) 104 { 105 DSO *ret; 106 107 if (default_DSO_meth == NULL) 108 /* We default to DSO_METH_openssl() which in turn defaults 109 * to stealing the "best available" method. Will fallback 110 * to DSO_METH_null() in the worst case. */ 111 default_DSO_meth = DSO_METHOD_openssl(); 112 ret = calloc(1, sizeof(DSO)); 113 if (ret == NULL) { 114 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE); 115 return (NULL); 116 } 117 ret->meth_data = sk_void_new_null(); 118 if (ret->meth_data == NULL) { 119 /* sk_new doesn't generate any errors so we do */ 120 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE); 121 free(ret); 122 return (NULL); 123 } 124 if (meth == NULL) 125 ret->meth = default_DSO_meth; 126 else 127 ret->meth = meth; 128 ret->references = 1; 129 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { 130 free(ret); 131 ret = NULL; 132 } 133 return (ret); 134 } 135 136 int 137 DSO_free(DSO *dso) 138 { 139 int i; 140 141 if (dso == NULL) { 142 DSOerr(DSO_F_DSO_FREE, ERR_R_PASSED_NULL_PARAMETER); 143 return (0); 144 } 145 146 i = CRYPTO_add(&dso->references, -1, CRYPTO_LOCK_DSO); 147 if (i > 0) 148 return (1); 149 150 if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) { 151 DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED); 152 return (0); 153 } 154 155 if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) { 156 DSOerr(DSO_F_DSO_FREE, DSO_R_FINISH_FAILED); 157 return (0); 158 } 159 160 sk_void_free(dso->meth_data); 161 free(dso->filename); 162 free(dso->loaded_filename); 163 free(dso); 164 return (1); 165 } 166 167 int 168 DSO_flags(DSO *dso) 169 { 170 return ((dso == NULL) ? 0 : dso->flags); 171 } 172 173 174 int 175 DSO_up_ref(DSO *dso) 176 { 177 if (dso == NULL) { 178 DSOerr(DSO_F_DSO_UP_REF, ERR_R_PASSED_NULL_PARAMETER); 179 return (0); 180 } 181 182 CRYPTO_add(&dso->references, 1, CRYPTO_LOCK_DSO); 183 return (1); 184 } 185 186 DSO * 187 DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags) 188 { 189 DSO *ret; 190 int allocated = 0; 191 192 if (dso == NULL) { 193 ret = DSO_new_method(meth); 194 if (ret == NULL) { 195 DSOerr(DSO_F_DSO_LOAD, ERR_R_MALLOC_FAILURE); 196 goto err; 197 } 198 allocated = 1; 199 /* Pass the provided flags to the new DSO object */ 200 if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) { 201 DSOerr(DSO_F_DSO_LOAD, DSO_R_CTRL_FAILED); 202 goto err; 203 } 204 } else 205 ret = dso; 206 /* Don't load if we're currently already loaded */ 207 if (ret->filename != NULL) { 208 DSOerr(DSO_F_DSO_LOAD, DSO_R_DSO_ALREADY_LOADED); 209 goto err; 210 } 211 /* filename can only be NULL if we were passed a dso that already has 212 * one set. */ 213 if (filename != NULL) 214 if (!DSO_set_filename(ret, filename)) { 215 DSOerr(DSO_F_DSO_LOAD, DSO_R_SET_FILENAME_FAILED); 216 goto err; 217 } 218 filename = ret->filename; 219 if (filename == NULL) { 220 DSOerr(DSO_F_DSO_LOAD, DSO_R_NO_FILENAME); 221 goto err; 222 } 223 if (ret->meth->dso_load == NULL) { 224 DSOerr(DSO_F_DSO_LOAD, DSO_R_UNSUPPORTED); 225 goto err; 226 } 227 if (!ret->meth->dso_load(ret)) { 228 DSOerr(DSO_F_DSO_LOAD, DSO_R_LOAD_FAILED); 229 goto err; 230 } 231 /* Load succeeded */ 232 return (ret); 233 234 err: 235 if (allocated) 236 DSO_free(ret); 237 return (NULL); 238 } 239 240 void * 241 DSO_bind_var(DSO *dso, const char *symname) 242 { 243 void *ret = NULL; 244 245 if ((dso == NULL) || (symname == NULL)) { 246 DSOerr(DSO_F_DSO_BIND_VAR, ERR_R_PASSED_NULL_PARAMETER); 247 return (NULL); 248 } 249 if (dso->meth->dso_bind_var == NULL) { 250 DSOerr(DSO_F_DSO_BIND_VAR, DSO_R_UNSUPPORTED); 251 return (NULL); 252 } 253 if ((ret = dso->meth->dso_bind_var(dso, symname)) == NULL) { 254 DSOerr(DSO_F_DSO_BIND_VAR, DSO_R_SYM_FAILURE); 255 return (NULL); 256 } 257 /* Success */ 258 return (ret); 259 } 260 261 DSO_FUNC_TYPE 262 DSO_bind_func(DSO *dso, const char *symname) 263 { 264 DSO_FUNC_TYPE ret = NULL; 265 266 if ((dso == NULL) || (symname == NULL)) { 267 DSOerr(DSO_F_DSO_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER); 268 return (NULL); 269 } 270 if (dso->meth->dso_bind_func == NULL) { 271 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_UNSUPPORTED); 272 return (NULL); 273 } 274 if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) { 275 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_SYM_FAILURE); 276 return (NULL); 277 } 278 /* Success */ 279 return (ret); 280 } 281 282 /* I don't really like these *_ctrl functions very much to be perfectly 283 * honest. For one thing, I think I have to return a negative value for 284 * any error because possible DSO_ctrl() commands may return values 285 * such as "size"s that can legitimately be zero (making the standard 286 * "if(DSO_cmd(...))" form that works almost everywhere else fail at 287 * odd times. I'd prefer "output" values to be passed by reference and 288 * the return value as success/failure like usual ... but we conform 289 * when we must... :-) */ 290 long 291 DSO_ctrl(DSO *dso, int cmd, long larg, void *parg) 292 { 293 if (dso == NULL) { 294 DSOerr(DSO_F_DSO_CTRL, ERR_R_PASSED_NULL_PARAMETER); 295 return (-1); 296 } 297 /* We should intercept certain generic commands and only pass control 298 * to the method-specific ctrl() function if it's something we don't 299 * handle. */ 300 switch (cmd) { 301 case DSO_CTRL_GET_FLAGS: 302 return dso->flags; 303 case DSO_CTRL_SET_FLAGS: 304 dso->flags = (int)larg; 305 return (0); 306 case DSO_CTRL_OR_FLAGS: 307 dso->flags |= (int)larg; 308 return (0); 309 default: 310 break; 311 } 312 if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) { 313 DSOerr(DSO_F_DSO_CTRL, DSO_R_UNSUPPORTED); 314 return (-1); 315 } 316 return (dso->meth->dso_ctrl(dso, cmd, larg, parg)); 317 } 318 319 int 320 DSO_set_name_converter(DSO *dso, DSO_NAME_CONVERTER_FUNC cb, 321 DSO_NAME_CONVERTER_FUNC *oldcb) 322 { 323 if (dso == NULL) { 324 DSOerr(DSO_F_DSO_SET_NAME_CONVERTER, 325 ERR_R_PASSED_NULL_PARAMETER); 326 return (0); 327 } 328 if (oldcb) 329 *oldcb = dso->name_converter; 330 dso->name_converter = cb; 331 return (1); 332 } 333 334 const char * 335 DSO_get_filename(DSO *dso) 336 { 337 if (dso == NULL) { 338 DSOerr(DSO_F_DSO_GET_FILENAME, ERR_R_PASSED_NULL_PARAMETER); 339 return (NULL); 340 } 341 return (dso->filename); 342 } 343 344 int 345 DSO_set_filename(DSO *dso, const char *filename) 346 { 347 char *copied; 348 349 if ((dso == NULL) || (filename == NULL)) { 350 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_PASSED_NULL_PARAMETER); 351 return (0); 352 } 353 if (dso->loaded_filename) { 354 DSOerr(DSO_F_DSO_SET_FILENAME, DSO_R_DSO_ALREADY_LOADED); 355 return (0); 356 } 357 /* We'll duplicate filename */ 358 copied = strdup(filename); 359 if (copied == NULL) { 360 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_MALLOC_FAILURE); 361 return (0); 362 } 363 free(dso->filename); 364 dso->filename = copied; 365 return (1); 366 } 367 368 char * 369 DSO_merge(DSO *dso, const char *filespec1, const char *filespec2) 370 { 371 char *result = NULL; 372 373 if (dso == NULL || filespec1 == NULL) { 374 DSOerr(DSO_F_DSO_MERGE, ERR_R_PASSED_NULL_PARAMETER); 375 return (NULL); 376 } 377 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) { 378 if (dso->merger != NULL) 379 result = dso->merger(dso, filespec1, filespec2); 380 else if (dso->meth->dso_merger != NULL) 381 result = dso->meth->dso_merger(dso, 382 filespec1, filespec2); 383 } 384 return (result); 385 } 386 387 char * 388 DSO_convert_filename(DSO *dso, const char *filename) 389 { 390 char *result = NULL; 391 392 if (dso == NULL) { 393 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_PASSED_NULL_PARAMETER); 394 return (NULL); 395 } 396 if (filename == NULL) 397 filename = dso->filename; 398 if (filename == NULL) { 399 DSOerr(DSO_F_DSO_CONVERT_FILENAME, DSO_R_NO_FILENAME); 400 return (NULL); 401 } 402 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) { 403 if (dso->name_converter != NULL) 404 result = dso->name_converter(dso, filename); 405 else if (dso->meth->dso_name_converter != NULL) 406 result = dso->meth->dso_name_converter(dso, filename); 407 } 408 if (result == NULL) { 409 result = strdup(filename); 410 if (result == NULL) { 411 DSOerr(DSO_F_DSO_CONVERT_FILENAME, 412 ERR_R_MALLOC_FAILURE); 413 return (NULL); 414 } 415 } 416 return (result); 417 } 418 419 const char * 420 DSO_get_loaded_filename(DSO *dso) 421 { 422 if (dso == NULL) { 423 DSOerr(DSO_F_DSO_GET_LOADED_FILENAME, 424 ERR_R_PASSED_NULL_PARAMETER); 425 return (NULL); 426 } 427 return (dso->loaded_filename); 428 } 429 430 int 431 DSO_pathbyaddr(void *addr, char *path, int sz) 432 { 433 DSO_METHOD *meth = default_DSO_meth; 434 if (meth == NULL) 435 meth = DSO_METHOD_openssl(); 436 if (meth->pathbyaddr == NULL) { 437 DSOerr(DSO_F_DSO_PATHBYADDR, DSO_R_UNSUPPORTED); 438 return -1; 439 } 440 return (*meth->pathbyaddr)(addr, path, sz); 441 } 442 443 void * 444 DSO_global_lookup(const char *name) 445 { 446 DSO_METHOD *meth = default_DSO_meth; 447 if (meth == NULL) 448 meth = DSO_METHOD_openssl(); 449 if (meth->globallookup == NULL) { 450 DSOerr(DSO_F_DSO_GLOBAL_LOOKUP, DSO_R_UNSUPPORTED); 451 return NULL; 452 } 453 return (*meth->globallookup)(name); 454 } 455