1 /* $OpenBSD: dso_lib.c,v 1.20 2018/08/24 19:27:01 tb 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 DSOerror(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 DSOerror(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 DSOerror(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 DSOerror(DSO_R_UNLOAD_FAILED); 152 return (0); 153 } 154 155 if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) { 156 DSOerror(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 int refs; 178 179 if (dso == NULL) { 180 DSOerror(ERR_R_PASSED_NULL_PARAMETER); 181 return (0); 182 } 183 184 refs = CRYPTO_add(&dso->references, 1, CRYPTO_LOCK_DSO); 185 return ((refs > 1) ? 1 : 0); 186 } 187 188 DSO * 189 DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags) 190 { 191 DSO *ret; 192 int allocated = 0; 193 194 if (dso == NULL) { 195 ret = DSO_new_method(meth); 196 if (ret == NULL) { 197 DSOerror(ERR_R_MALLOC_FAILURE); 198 goto err; 199 } 200 allocated = 1; 201 /* Pass the provided flags to the new DSO object */ 202 if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) { 203 DSOerror(DSO_R_CTRL_FAILED); 204 goto err; 205 } 206 } else 207 ret = dso; 208 /* Don't load if we're currently already loaded */ 209 if (ret->filename != NULL) { 210 DSOerror(DSO_R_DSO_ALREADY_LOADED); 211 goto err; 212 } 213 /* filename can only be NULL if we were passed a dso that already has 214 * one set. */ 215 if (filename != NULL) 216 if (!DSO_set_filename(ret, filename)) { 217 DSOerror(DSO_R_SET_FILENAME_FAILED); 218 goto err; 219 } 220 filename = ret->filename; 221 if (filename == NULL) { 222 DSOerror(DSO_R_NO_FILENAME); 223 goto err; 224 } 225 if (ret->meth->dso_load == NULL) { 226 DSOerror(DSO_R_UNSUPPORTED); 227 goto err; 228 } 229 if (!ret->meth->dso_load(ret)) { 230 DSOerror(DSO_R_LOAD_FAILED); 231 goto err; 232 } 233 /* Load succeeded */ 234 return (ret); 235 236 err: 237 if (allocated) 238 DSO_free(ret); 239 return (NULL); 240 } 241 242 void * 243 DSO_bind_var(DSO *dso, const char *symname) 244 { 245 void *ret = NULL; 246 247 if ((dso == NULL) || (symname == NULL)) { 248 DSOerror(ERR_R_PASSED_NULL_PARAMETER); 249 return (NULL); 250 } 251 if (dso->meth->dso_bind_var == NULL) { 252 DSOerror(DSO_R_UNSUPPORTED); 253 return (NULL); 254 } 255 if ((ret = dso->meth->dso_bind_var(dso, symname)) == NULL) { 256 DSOerror(DSO_R_SYM_FAILURE); 257 return (NULL); 258 } 259 /* Success */ 260 return (ret); 261 } 262 263 DSO_FUNC_TYPE 264 DSO_bind_func(DSO *dso, const char *symname) 265 { 266 DSO_FUNC_TYPE ret = NULL; 267 268 if ((dso == NULL) || (symname == NULL)) { 269 DSOerror(ERR_R_PASSED_NULL_PARAMETER); 270 return (NULL); 271 } 272 if (dso->meth->dso_bind_func == NULL) { 273 DSOerror(DSO_R_UNSUPPORTED); 274 return (NULL); 275 } 276 if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) { 277 DSOerror(DSO_R_SYM_FAILURE); 278 return (NULL); 279 } 280 /* Success */ 281 return (ret); 282 } 283 284 /* I don't really like these *_ctrl functions very much to be perfectly 285 * honest. For one thing, I think I have to return a negative value for 286 * any error because possible DSO_ctrl() commands may return values 287 * such as "size"s that can legitimately be zero (making the standard 288 * "if(DSO_cmd(...))" form that works almost everywhere else fail at 289 * odd times. I'd prefer "output" values to be passed by reference and 290 * the return value as success/failure like usual ... but we conform 291 * when we must... :-) */ 292 long 293 DSO_ctrl(DSO *dso, int cmd, long larg, void *parg) 294 { 295 if (dso == NULL) { 296 DSOerror(ERR_R_PASSED_NULL_PARAMETER); 297 return (-1); 298 } 299 /* We should intercept certain generic commands and only pass control 300 * to the method-specific ctrl() function if it's something we don't 301 * handle. */ 302 switch (cmd) { 303 case DSO_CTRL_GET_FLAGS: 304 return dso->flags; 305 case DSO_CTRL_SET_FLAGS: 306 dso->flags = (int)larg; 307 return (0); 308 case DSO_CTRL_OR_FLAGS: 309 dso->flags |= (int)larg; 310 return (0); 311 default: 312 break; 313 } 314 if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) { 315 DSOerror(DSO_R_UNSUPPORTED); 316 return (-1); 317 } 318 return (dso->meth->dso_ctrl(dso, cmd, larg, parg)); 319 } 320 321 int 322 DSO_set_name_converter(DSO *dso, DSO_NAME_CONVERTER_FUNC cb, 323 DSO_NAME_CONVERTER_FUNC *oldcb) 324 { 325 if (dso == NULL) { 326 DSOerror(ERR_R_PASSED_NULL_PARAMETER); 327 return (0); 328 } 329 if (oldcb) 330 *oldcb = dso->name_converter; 331 dso->name_converter = cb; 332 return (1); 333 } 334 335 const char * 336 DSO_get_filename(DSO *dso) 337 { 338 if (dso == NULL) { 339 DSOerror(ERR_R_PASSED_NULL_PARAMETER); 340 return (NULL); 341 } 342 return (dso->filename); 343 } 344 345 int 346 DSO_set_filename(DSO *dso, const char *filename) 347 { 348 char *copied; 349 350 if ((dso == NULL) || (filename == NULL)) { 351 DSOerror(ERR_R_PASSED_NULL_PARAMETER); 352 return (0); 353 } 354 if (dso->loaded_filename) { 355 DSOerror(DSO_R_DSO_ALREADY_LOADED); 356 return (0); 357 } 358 /* We'll duplicate filename */ 359 copied = strdup(filename); 360 if (copied == NULL) { 361 DSOerror(ERR_R_MALLOC_FAILURE); 362 return (0); 363 } 364 free(dso->filename); 365 dso->filename = copied; 366 return (1); 367 } 368 369 char * 370 DSO_merge(DSO *dso, const char *filespec1, const char *filespec2) 371 { 372 char *result = NULL; 373 374 if (dso == NULL || filespec1 == NULL) { 375 DSOerror(ERR_R_PASSED_NULL_PARAMETER); 376 return (NULL); 377 } 378 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) { 379 if (dso->merger != NULL) 380 result = dso->merger(dso, filespec1, filespec2); 381 else if (dso->meth->dso_merger != NULL) 382 result = dso->meth->dso_merger(dso, 383 filespec1, filespec2); 384 } 385 return (result); 386 } 387 388 char * 389 DSO_convert_filename(DSO *dso, const char *filename) 390 { 391 char *result = NULL; 392 393 if (dso == NULL) { 394 DSOerror(ERR_R_PASSED_NULL_PARAMETER); 395 return (NULL); 396 } 397 if (filename == NULL) 398 filename = dso->filename; 399 if (filename == NULL) { 400 DSOerror(DSO_R_NO_FILENAME); 401 return (NULL); 402 } 403 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) { 404 if (dso->name_converter != NULL) 405 result = dso->name_converter(dso, filename); 406 else if (dso->meth->dso_name_converter != NULL) 407 result = dso->meth->dso_name_converter(dso, filename); 408 } 409 if (result == NULL) { 410 result = strdup(filename); 411 if (result == NULL) { 412 DSOerror(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 DSOerror(ERR_R_PASSED_NULL_PARAMETER); 424 return (NULL); 425 } 426 return (dso->loaded_filename); 427 } 428 429 int 430 DSO_pathbyaddr(void *addr, char *path, int sz) 431 { 432 DSO_METHOD *meth = default_DSO_meth; 433 if (meth == NULL) 434 meth = DSO_METHOD_openssl(); 435 if (meth->pathbyaddr == NULL) { 436 DSOerror(DSO_R_UNSUPPORTED); 437 return -1; 438 } 439 return (*meth->pathbyaddr)(addr, path, sz); 440 } 441 442 void * 443 DSO_global_lookup(const char *name) 444 { 445 DSO_METHOD *meth = default_DSO_meth; 446 if (meth == NULL) 447 meth = DSO_METHOD_openssl(); 448 if (meth->globallookup == NULL) { 449 DSOerror(DSO_R_UNSUPPORTED); 450 return NULL; 451 } 452 return (*meth->globallookup)(name); 453 } 454