crypto/mem.c

   1 /* crypto/mem.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@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@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@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@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 static int allow_customize = 1; /* we provide flexible functions for */
  65 static int allow_customize_debug = 1; /* exchanging memory-related functions
  66                                        * at run-time, but this must be done
  67                                        * before any blocks are actually
  68                                        * allocated; or we'll run into huge
  69                                        * problems when malloc/free pairs
  70                                        * don't match etc. */
  71
  72 /*
  73  * the following pointers may be changed as long as 'allow_customize' is set
  74  */
  75
  76 static void *(*malloc_func) (size_t) = malloc;
  77 static void *default_malloc_ex(size_t num, const char *file, int line)
  78 {
  79     return malloc_func(num);
  80 }
  81
  82 static void *(*malloc_ex_func) (size_t, const char *file, int line)
  83     = default_malloc_ex;
  84
  85 static void *(*realloc_func) (void *, size_t) = realloc;
  86 static void *default_realloc_ex(void *str, size_t num,
  87                                 const char *file, int line)
  88 {
  89     return realloc_func(str, num);
  90 }
  91
  92 static void *(*realloc_ex_func) (void *, size_t, const char *file, int line)
  93     = default_realloc_ex;
  94
  95 static void (*free_func) (void *) = free;
  96
  97 static void *(*malloc_locked_func) (size_t) = malloc;
  98 static void *default_malloc_locked_ex(size_t num, const char *file, int line)
  99 {
 100     return malloc_locked_func(num);
 101 }
 102
 103 static void *(*malloc_locked_ex_func) (size_t, const char *file, int line)
 104     = default_malloc_locked_ex;
 105
 106 static void (*free_locked_func) (void *) = free;
 107
 108 /* may be changed as long as 'allow_customize_debug' is set */
 109 /* XXX use correct function pointer types */
 110 #ifdef CRYPTO_MDEBUG
 111 /* use default functions from mem_dbg.c */
 112 static void (*malloc_debug_func) (void *, int, const char *, int, int)
 113     = CRYPTO_dbg_malloc;
 114 static void (*realloc_debug_func) (void *, void *, int, const char *, int,
 115                                    int)
 116     = CRYPTO_dbg_realloc;
 117 static void (*free_debug_func) (void *, int) = CRYPTO_dbg_free;
 118 static void (*set_debug_options_func) (long) = CRYPTO_dbg_set_options;
 119 static long (*get_debug_options_func) (void) = CRYPTO_dbg_get_options;
 120 #else
 121 /*
 122  * applications can use CRYPTO_malloc_debug_init() to select above case at
 123  * run-time
 124  */
 125 static void (*malloc_debug_func) (void *, int, const char *, int, int) = NULL;
 126 static void (*realloc_debug_func) (void *, void *, int, const char *, int,
 127                                    int)
 128     = NULL;
 129 static void (*free_debug_func) (void *, int) = NULL;
 130 static void (*set_debug_options_func) (long) = NULL;
 131 static long (*get_debug_options_func) (void) = NULL;
 132 #endif
 133
 134 int CRYPTO_set_mem_functions(void *(*m) (size_t), void *(*r) (void *, size_t),
 135                              void (*f) (void *))
 136 {
 137     /* Dummy call just to ensure OPENSSL_init() gets linked in */
 138     OPENSSL_init();
 139     if (!allow_customize)
 140         return 0;
 141     if ((m == 0) || (r == 0) || (f == 0))
 142         return 0;
 143     malloc_func = m;
 144     malloc_ex_func = default_malloc_ex;
 145     realloc_func = r;
 146     realloc_ex_func = default_realloc_ex;
 147     free_func = f;
 148     malloc_locked_func = m;
 149     malloc_locked_ex_func = default_malloc_locked_ex;
 150     free_locked_func = f;
 151     return 1;
 152 }
 153
 154 int CRYPTO_set_mem_ex_functions(void *(*m) (size_t, const char *, int),
 155                                 void *(*r) (void *, size_t, const char *,
 156                                             int), void (*f) (void *))
 157 {
 158     if (!allow_customize)
 159         return 0;
 160     if ((m == 0) || (r == 0) || (f == 0))
 161         return 0;
 162     malloc_func = 0;
 163     malloc_ex_func = m;
 164     realloc_func = 0;
 165     realloc_ex_func = r;
 166     free_func = f;
 167     malloc_locked_func = 0;
 168     malloc_locked_ex_func = m;
 169     free_locked_func = f;
 170     return 1;
 171 }
 172
 173 int CRYPTO_set_locked_mem_functions(void *(*m) (size_t), void (*f) (void *))
 174 {
 175     if (!allow_customize)
 176         return 0;
 177     if ((m == NULL) || (f == NULL))
 178         return 0;
 179     malloc_locked_func = m;
 180     malloc_locked_ex_func = default_malloc_locked_ex;
 181     free_locked_func = f;
 182     return 1;
 183 }
 184
 185 int CRYPTO_set_locked_mem_ex_functions(void *(*m) (size_t, const char *, int),
 186                                        void (*f) (void *))
 187 {
 188     if (!allow_customize)
 189         return 0;
 190     if ((m == NULL) || (f == NULL))
 191         return 0;
 192     malloc_locked_func = 0;
 193     malloc_locked_ex_func = m;
 194     free_func = f;
 195     return 1;
 196 }
 197
 198 int CRYPTO_set_mem_debug_functions(void (*m)
 199                                     (void *, int, const char *, int, int),
 200                                    void (*r) (void *, void *, int,
 201                                               const char *, int, int),
 202                                    void (*f) (void *, int), void (*so) (long),
 203                                    long (*go) (void))
 204 {
 205     if (!allow_customize_debug)
 206         return 0;
 207     malloc_debug_func = m;
 208     realloc_debug_func = r;
 209     free_debug_func = f;
 210     set_debug_options_func = so;
 211     get_debug_options_func = go;
 212     return 1;
 213 }
 214
 215 void CRYPTO_get_mem_functions(void *(**m) (size_t),
 216                               void *(**r) (void *, size_t),
 217                               void (**f) (void *))
 218 {
 219     if (m != NULL)
 220         *m = (malloc_ex_func == default_malloc_ex) ? malloc_func : 0;
 221     if (r != NULL)
 222         *r = (realloc_ex_func == default_realloc_ex) ? realloc_func : 0;
 223     if (f != NULL)
 224         *f = free_func;
 225 }
 226
 227 void CRYPTO_get_mem_ex_functions(void *(**m) (size_t, const char *, int),
 228                                  void *(**r) (void *, size_t, const char *,
 229                                               int), void (**f) (void *))
 230 {
 231     if (m != NULL)
 232         *m = (malloc_ex_func != default_malloc_ex) ? malloc_ex_func : 0;
 233     if (r != NULL)
 234         *r = (realloc_ex_func != default_realloc_ex) ? realloc_ex_func : 0;
 235     if (f != NULL)
 236         *f = free_func;
 237 }
 238
 239 void CRYPTO_get_locked_mem_functions(void *(**m) (size_t),
 240                                      void (**f) (void *))
 241 {
 242     if (m != NULL)
 243         *m = (malloc_locked_ex_func == default_malloc_locked_ex) ?
 244             malloc_locked_func : 0;
 245     if (f != NULL)
 246         *f = free_locked_func;
 247 }
 248
 249 void CRYPTO_get_locked_mem_ex_functions(void
 250                                         *(**m) (size_t, const char *, int),
 251                                         void (**f) (void *))
 252 {
 253     if (m != NULL)
 254         *m = (malloc_locked_ex_func != default_malloc_locked_ex) ?
 255             malloc_locked_ex_func : 0;
 256     if (f != NULL)
 257         *f = free_locked_func;
 258 }
 259
 260 void CRYPTO_get_mem_debug_functions(void (**m)
 261                                      (void *, int, const char *, int, int),
 262                                     void (**r) (void *, void *, int,
 263                                                 const char *, int, int),
 264                                     void (**f) (void *, int),
 265                                     void (**so) (long), long (**go) (void))
 266 {
 267     if (m != NULL)
 268         *m = malloc_debug_func;
 269     if (r != NULL)
 270         *r = realloc_debug_func;
 271     if (f != NULL)
 272         *f = free_debug_func;
 273     if (so != NULL)
 274         *so = set_debug_options_func;
 275     if (go != NULL)
 276         *go = get_debug_options_func;
 277 }
 278
 279 void *CRYPTO_malloc_locked(int num, const char *file, int line)
 280 {
 281     void *ret = NULL;
 282
 283     if (num <= 0)
 284         return NULL;
 285
 286     if (allow_customize)
 287         allow_customize = 0;
 288     if (malloc_debug_func != NULL) {
 289         if (allow_customize_debug)
 290             allow_customize_debug = 0;
 291         malloc_debug_func(NULL, num, file, line, 0);
 292     }
 293     ret = malloc_locked_ex_func(num, file, line);
 294 #ifdef LEVITTE_DEBUG_MEM
 295     fprintf(stderr, "LEVITTE_DEBUG_MEM:         > 0x%p (%d)\n", ret, num);
 296 #endif
 297     if (malloc_debug_func != NULL)
 298         malloc_debug_func(ret, num, file, line, 1);
 299
 300 #ifndef OPENSSL_CPUID_OBJ
 301     /*
 302      * Create a dependency on the value of 'cleanse_ctr' so our memory
 303      * sanitisation function can't be optimised out. NB: We only do this for
 304      * >2Kb so the overhead doesn't bother us.
 305      */
 306     if (ret && (num > 2048)) {
 307         extern unsigned char cleanse_ctr;
 308         ((unsigned char *)ret)[0] = cleanse_ctr;
 309     }
 310 #endif
 311
 312     return ret;
 313 }
 314
 315 void CRYPTO_free_locked(void *str)
 316 {
 317     if (free_debug_func != NULL)
 318         free_debug_func(str, 0);
 319 #ifdef LEVITTE_DEBUG_MEM
 320     fprintf(stderr, "LEVITTE_DEBUG_MEM:         < 0x%p\n", str);
 321 #endif
 322     free_locked_func(str);
 323     if (free_debug_func != NULL)
 324         free_debug_func(NULL, 1);
 325 }
 326
 327 void *CRYPTO_malloc(int num, const char *file, int line)
 328 {
 329     void *ret = NULL;
 330
 331     if (num <= 0)
 332         return NULL;
 333
 334     if (allow_customize)
 335         allow_customize = 0;
 336     if (malloc_debug_func != NULL) {
 337         if (allow_customize_debug)
 338             allow_customize_debug = 0;
 339         malloc_debug_func(NULL, num, file, line, 0);
 340     }
 341     ret = malloc_ex_func(num, file, line);
 342 #ifdef LEVITTE_DEBUG_MEM
 343     fprintf(stderr, "LEVITTE_DEBUG_MEM:         > 0x%p (%d)\n", ret, num);
 344 #endif
 345     if (malloc_debug_func != NULL)
 346         malloc_debug_func(ret, num, file, line, 1);
 347
 348 #ifndef OPENSSL_CPUID_OBJ
 349     /*
 350      * Create a dependency on the value of 'cleanse_ctr' so our memory
 351      * sanitisation function can't be optimised out. NB: We only do this for
 352      * >2Kb so the overhead doesn't bother us.
 353      */
 354     if (ret && (num > 2048)) {
 355         extern unsigned char cleanse_ctr;
 356         ((unsigned char *)ret)[0] = cleanse_ctr;
 357     }
 358 #endif
 359
 360     return ret;
 361 }
 362
 363 char *CRYPTO_strdup(const char *str, const char *file, int line)
 364 {
 365     char *ret = CRYPTO_malloc(strlen(str) + 1, file, line);
 366
 367     if (ret == NULL)
 368         return NULL;
 369
 370     strcpy(ret, str);
 371     return ret;
 372 }
 373
 374 void *CRYPTO_realloc(void *str, int num, const char *file, int line)
 375 {
 376     void *ret = NULL;
 377
 378     if (str == NULL)
 379         return CRYPTO_malloc(num, file, line);
 380
 381     if (num <= 0)
 382         return NULL;
 383
 384     if (realloc_debug_func != NULL)
 385         realloc_debug_func(str, NULL, num, file, line, 0);
 386     ret = realloc_ex_func(str, num, file, line);
 387 #ifdef LEVITTE_DEBUG_MEM
 388     fprintf(stderr, "LEVITTE_DEBUG_MEM:         | 0x%p -> 0x%p (%d)\n", str,
 389             ret, num);
 390 #endif
 391     if (realloc_debug_func != NULL)
 392         realloc_debug_func(str, ret, num, file, line, 1);
 393
 394     return ret;
 395 }
 396
 397 void *CRYPTO_realloc_clean(void *str, int old_len, int num, const char *file,
 398                            int line)
 399 {
 400     void *ret = NULL;
 401
 402     if (str == NULL)
 403         return CRYPTO_malloc(num, file, line);
 404
 405     if (num <= 0)
 406         return NULL;
 407
 408     /*
 409      * We don't support shrinking the buffer. Note the memcpy that copies
 410      * |old_len| bytes to the new buffer, below.
 411      */
 412     if (num < old_len)
 413         return NULL;
 414
 415     if (realloc_debug_func != NULL)
 416         realloc_debug_func(str, NULL, num, file, line, 0);
 417     ret = malloc_ex_func(num, file, line);
 418     if (ret) {
 419         memcpy(ret, str, old_len);
 420         OPENSSL_clear_free(str, old_len);
 421     }
 422 #ifdef LEVITTE_DEBUG_MEM
 423     fprintf(stderr,
 424             "LEVITTE_DEBUG_MEM:         | 0x%p -> 0x%p (%d)\n",
 425             str, ret, num);
 426 #endif
 427     if (realloc_debug_func != NULL)
 428         realloc_debug_func(str, ret, num, file, line, 1);
 429
 430     return ret;
 431 }
 432
 433 void CRYPTO_free(void *str)
 434 {
 435     if (free_debug_func != NULL)
 436         free_debug_func(str, 0);
 437 #ifdef LEVITTE_DEBUG_MEM
 438     fprintf(stderr, "LEVITTE_DEBUG_MEM:         < 0x%p\n", str);
 439 #endif
 440     free_func(str);
 441     if (free_debug_func != NULL)
 442         free_debug_func(NULL, 1);
 443 }
 444
 445 void CRYPTO_clear_free(void *str, size_t num)
 446 {
 447     if (!str)
 448         return;
 449     if (num)
 450         OPENSSL_cleanse(str, num);
 451     CRYPTO_free(str);
 452 }
 453
 454 void *CRYPTO_remalloc(void *a, int num, const char *file, int line)
 455 {
 456     OPENSSL_free(a);
 457     a = OPENSSL_malloc(num);
 458     return (a);
 459 }
 460
 461 void CRYPTO_set_mem_debug_options(long bits)
 462 {
 463     if (set_debug_options_func != NULL)
 464         set_debug_options_func(bits);
 465 }
 466
 467 long CRYPTO_get_mem_debug_options(void)
 468 {
 469     if (get_debug_options_func != NULL)
 470         return get_debug_options_func();
 471     return 0;
 472 }