1 /* crypto/mem.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay (at) cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <openssl/crypto.h> 62 #include "cryptlib.h" 63 64 65 static int allow_customize = 1; /* we provide flexible functions for */ 66 static int allow_customize_debug = 1;/* exchanging memory-related functions at 67 * run-time, but this must be done 68 * before any blocks are actually 69 * allocated; or we'll run into huge 70 * problems when malloc/free pairs 71 * don't match etc. */ 72 73 74 75 /* the following pointers may be changed as long as 'allow_customize' is set */ 76 77 static void *(*malloc_func)(size_t) = malloc; 78 static void *default_malloc_ex(size_t num, const char *file, int line) 79 { return malloc_func(num); } 80 static void *(*malloc_ex_func)(size_t, const char *file, int line) 81 = default_malloc_ex; 82 83 static void *(*realloc_func)(void *, size_t)= realloc; 84 static void *default_realloc_ex(void *str, size_t num, 85 const char *file, int line) 86 { return realloc_func(str,num); } 87 static void *(*realloc_ex_func)(void *, size_t, const char *file, int line) 88 = default_realloc_ex; 89 90 static void (*free_func)(void *) = free; 91 92 static void *(*malloc_locked_func)(size_t) = malloc; 93 static void *default_malloc_locked_ex(size_t num, const char *file, int line) 94 { return malloc_locked_func(num); } 95 static void *(*malloc_locked_ex_func)(size_t, const char *file, int line) 96 = default_malloc_locked_ex; 97 98 static void (*free_locked_func)(void *) = free; 99 100 101 102 /* may be changed as long as 'allow_customize_debug' is set */ 103 /* XXX use correct function pointer types */ 104 #ifdef CRYPTO_MDEBUG 105 /* use default functions from mem_dbg.c */ 106 static void (*malloc_debug_func)(void *,int,const char *,int,int) 107 = CRYPTO_dbg_malloc; 108 static void (*realloc_debug_func)(void *,void *,int,const char *,int,int) 109 = CRYPTO_dbg_realloc; 110 static void (*free_debug_func)(void *,int) = CRYPTO_dbg_free; 111 static void (*set_debug_options_func)(long) = CRYPTO_dbg_set_options; 112 static long (*get_debug_options_func)(void) = CRYPTO_dbg_get_options; 113 #else 114 /* applications can use CRYPTO_malloc_debug_init() to select above case 115 * at run-time */ 116 static void (*malloc_debug_func)(void *,int,const char *,int,int) = NULL; 117 static void (*realloc_debug_func)(void *,void *,int,const char *,int,int) 118 = NULL; 119 static void (*free_debug_func)(void *,int) = NULL; 120 static void (*set_debug_options_func)(long) = NULL; 121 static long (*get_debug_options_func)(void) = NULL; 122 #endif 123 124 int CRYPTO_set_mem_functions(void *(*m)(size_t), void *(*r)(void *, size_t), 125 void (*f)(void *)) 126 { 127 /* Dummy call just to ensure OPENSSL_init() gets linked in */ 128 OPENSSL_init(); 129 if (!allow_customize) 130 return 0; 131 if ((m == 0) || (r == 0) || (f == 0)) 132 return 0; 133 malloc_func=m; malloc_ex_func=default_malloc_ex; 134 realloc_func=r; realloc_ex_func=default_realloc_ex; 135 free_func=f; 136 malloc_locked_func=m; malloc_locked_ex_func=default_malloc_locked_ex; 137 free_locked_func=f; 138 return 1; 139 } 140 141 int CRYPTO_set_mem_ex_functions( 142 void *(*m)(size_t,const char *,int), 143 void *(*r)(void *, size_t,const char *,int), 144 void (*f)(void *)) 145 { 146 if (!allow_customize) 147 return 0; 148 if ((m == 0) || (r == 0) || (f == 0)) 149 return 0; 150 malloc_func=0; malloc_ex_func=m; 151 realloc_func=0; realloc_ex_func=r; 152 free_func=f; 153 malloc_locked_func=0; malloc_locked_ex_func=m; 154 free_locked_func=f; 155 return 1; 156 } 157 158 int CRYPTO_set_locked_mem_functions(void *(*m)(size_t), void (*f)(void *)) 159 { 160 if (!allow_customize) 161 return 0; 162 if ((m == NULL) || (f == NULL)) 163 return 0; 164 malloc_locked_func=m; malloc_locked_ex_func=default_malloc_locked_ex; 165 free_locked_func=f; 166 return 1; 167 } 168 169 int CRYPTO_set_locked_mem_ex_functions( 170 void *(*m)(size_t,const char *,int), 171 void (*f)(void *)) 172 { 173 if (!allow_customize) 174 return 0; 175 if ((m == NULL) || (f == NULL)) 176 return 0; 177 malloc_locked_func=0; malloc_locked_ex_func=m; 178 free_func=f; 179 return 1; 180 } 181 182 int CRYPTO_set_mem_debug_functions(void (*m)(void *,int,const char *,int,int), 183 void (*r)(void *,void *,int,const char *,int,int), 184 void (*f)(void *,int), 185 void (*so)(long), 186 long (*go)(void)) 187 { 188 if (!allow_customize_debug) 189 return 0; 190 OPENSSL_init(); 191 malloc_debug_func=m; 192 realloc_debug_func=r; 193 free_debug_func=f; 194 set_debug_options_func=so; 195 get_debug_options_func=go; 196 return 1; 197 } 198 199 200 void CRYPTO_get_mem_functions(void *(**m)(size_t), void *(**r)(void *, size_t), 201 void (**f)(void *)) 202 { 203 if (m != NULL) *m = (malloc_ex_func == default_malloc_ex) ? 204 malloc_func : 0; 205 if (r != NULL) *r = (realloc_ex_func == default_realloc_ex) ? 206 realloc_func : 0; 207 if (f != NULL) *f=free_func; 208 } 209 210 void CRYPTO_get_mem_ex_functions( 211 void *(**m)(size_t,const char *,int), 212 void *(**r)(void *, size_t,const char *,int), 213 void (**f)(void *)) 214 { 215 if (m != NULL) *m = (malloc_ex_func != default_malloc_ex) ? 216 malloc_ex_func : 0; 217 if (r != NULL) *r = (realloc_ex_func != default_realloc_ex) ? 218 realloc_ex_func : 0; 219 if (f != NULL) *f=free_func; 220 } 221 222 void CRYPTO_get_locked_mem_functions(void *(**m)(size_t), void (**f)(void *)) 223 { 224 if (m != NULL) *m = (malloc_locked_ex_func == default_malloc_locked_ex) ? 225 malloc_locked_func : 0; 226 if (f != NULL) *f=free_locked_func; 227 } 228 229 void CRYPTO_get_locked_mem_ex_functions( 230 void *(**m)(size_t,const char *,int), 231 void (**f)(void *)) 232 { 233 if (m != NULL) *m = (malloc_locked_ex_func != default_malloc_locked_ex) ? 234 malloc_locked_ex_func : 0; 235 if (f != NULL) *f=free_locked_func; 236 } 237 238 void CRYPTO_get_mem_debug_functions(void (**m)(void *,int,const char *,int,int), 239 void (**r)(void *,void *,int,const char *,int,int), 240 void (**f)(void *,int), 241 void (**so)(long), 242 long (**go)(void)) 243 { 244 if (m != NULL) *m=malloc_debug_func; 245 if (r != NULL) *r=realloc_debug_func; 246 if (f != NULL) *f=free_debug_func; 247 if (so != NULL) *so=set_debug_options_func; 248 if (go != NULL) *go=get_debug_options_func; 249 } 250 251 252 void *CRYPTO_malloc_locked(int num, const char *file, int line) 253 { 254 void *ret = NULL; 255 256 if (num <= 0) return NULL; 257 258 allow_customize = 0; 259 if (malloc_debug_func != NULL) 260 { 261 allow_customize_debug = 0; 262 malloc_debug_func(NULL, num, file, line, 0); 263 } 264 ret = malloc_locked_ex_func(num,file,line); 265 #ifdef LEVITTE_DEBUG_MEM 266 fprintf(stderr, "LEVITTE_DEBUG_MEM: > 0x%p (%d)\n", ret, num); 267 #endif 268 if (malloc_debug_func != NULL) 269 malloc_debug_func(ret, num, file, line, 1); 270 271 #ifndef OPENSSL_CPUID_OBJ 272 /* Create a dependency on the value of 'cleanse_ctr' so our memory 273 * sanitisation function can't be optimised out. NB: We only do 274 * this for >2Kb so the overhead doesn't bother us. */ 275 if(ret && (num > 2048)) 276 { extern unsigned char cleanse_ctr; 277 ((unsigned char *)ret)[0] = cleanse_ctr; 278 } 279 #endif 280 281 return ret; 282 } 283 284 void CRYPTO_free_locked(void *str) 285 { 286 if (free_debug_func != NULL) 287 free_debug_func(str, 0); 288 #ifdef LEVITTE_DEBUG_MEM 289 fprintf(stderr, "LEVITTE_DEBUG_MEM: < 0x%p\n", str); 290 #endif 291 free_locked_func(str); 292 if (free_debug_func != NULL) 293 free_debug_func(NULL, 1); 294 } 295 296 void *CRYPTO_malloc(int num, const char *file, int line) 297 { 298 void *ret = NULL; 299 300 if (num <= 0) return NULL; 301 302 allow_customize = 0; 303 if (malloc_debug_func != NULL) 304 { 305 allow_customize_debug = 0; 306 malloc_debug_func(NULL, num, file, line, 0); 307 } 308 ret = malloc_ex_func(num,file,line); 309 #ifdef LEVITTE_DEBUG_MEM 310 fprintf(stderr, "LEVITTE_DEBUG_MEM: > 0x%p (%d)\n", ret, num); 311 #endif 312 if (malloc_debug_func != NULL) 313 malloc_debug_func(ret, num, file, line, 1); 314 315 #ifndef OPENSSL_CPUID_OBJ 316 /* Create a dependency on the value of 'cleanse_ctr' so our memory 317 * sanitisation function can't be optimised out. NB: We only do 318 * this for >2Kb so the overhead doesn't bother us. */ 319 if(ret && (num > 2048)) 320 { extern unsigned char cleanse_ctr; 321 ((unsigned char *)ret)[0] = cleanse_ctr; 322 } 323 #endif 324 325 return ret; 326 } 327 char *CRYPTO_strdup(const char *str, const char *file, int line) 328 { 329 char *ret = CRYPTO_malloc(strlen(str)+1, file, line); 330 331 strcpy(ret, str); 332 return ret; 333 } 334 335 void *CRYPTO_realloc(void *str, int num, const char *file, int line) 336 { 337 void *ret = NULL; 338 339 if (str == NULL) 340 return CRYPTO_malloc(num, file, line); 341 342 if (num <= 0) return NULL; 343 344 if (realloc_debug_func != NULL) 345 realloc_debug_func(str, NULL, num, file, line, 0); 346 ret = realloc_ex_func(str,num,file,line); 347 #ifdef LEVITTE_DEBUG_MEM 348 fprintf(stderr, "LEVITTE_DEBUG_MEM: | 0x%p -> 0x%p (%d)\n", str, ret, num); 349 #endif 350 if (realloc_debug_func != NULL) 351 realloc_debug_func(str, ret, num, file, line, 1); 352 353 return ret; 354 } 355 356 void *CRYPTO_realloc_clean(void *str, int old_len, int num, const char *file, 357 int line) 358 { 359 void *ret = NULL; 360 361 if (str == NULL) 362 return CRYPTO_malloc(num, file, line); 363 364 if (num <= 0) return NULL; 365 366 /* We don't support shrinking the buffer. Note the memcpy that copies 367 * |old_len| bytes to the new buffer, below. */ 368 if (num < old_len) return NULL; 369 370 if (realloc_debug_func != NULL) 371 realloc_debug_func(str, NULL, num, file, line, 0); 372 ret=malloc_ex_func(num,file,line); 373 if(ret) 374 { 375 memcpy(ret,str,old_len); 376 OPENSSL_cleanse(str,old_len); 377 free_func(str); 378 } 379 #ifdef LEVITTE_DEBUG_MEM 380 fprintf(stderr, 381 "LEVITTE_DEBUG_MEM: | 0x%p -> 0x%p (%d)\n", 382 str, ret, num); 383 #endif 384 if (realloc_debug_func != NULL) 385 realloc_debug_func(str, ret, num, file, line, 1); 386 387 return ret; 388 } 389 390 void CRYPTO_free(void *str) 391 { 392 if (free_debug_func != NULL) 393 free_debug_func(str, 0); 394 #ifdef LEVITTE_DEBUG_MEM 395 fprintf(stderr, "LEVITTE_DEBUG_MEM: < 0x%p\n", str); 396 #endif 397 free_func(str); 398 if (free_debug_func != NULL) 399 free_debug_func(NULL, 1); 400 } 401 402 void *CRYPTO_remalloc(void *a, int num, const char *file, int line) 403 { 404 if (a != NULL) OPENSSL_free(a); 405 a=(char *)OPENSSL_malloc(num); 406 return(a); 407 } 408 409 void CRYPTO_set_mem_debug_options(long bits) 410 { 411 if (set_debug_options_func != NULL) 412 set_debug_options_func(bits); 413 } 414 415 long CRYPTO_get_mem_debug_options(void) 416 { 417 if (get_debug_options_func != NULL) 418 return get_debug_options_func(); 419 return 0; 420 } 421
