crypto/cryptlib.c

   1 /* crypto/cryptlib.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 <string.h>
  61 #include "cryptlib.h"
  62 #include <openssl/crypto.h>
  63 #include <openssl/safestack.h>
  64
  65 #if defined(WIN32) || defined(WIN16)
  66 static double SSLeay_MSVC5_hack=0.0; /* and for VC1.5 */
  67 #endif
  68
  69 DECLARE_STACK_OF(CRYPTO_dynlock)
  70 IMPLEMENT_STACK_OF(CRYPTO_dynlock)
  71
  72 /* real #defines in crypto.h, keep these upto date */
  73 static const char* lock_names[CRYPTO_NUM_LOCKS] =
  74         {
  75         "<<ERROR>>",
  76         "err",
  77         "err_hash",
  78         "x509",
  79         "x509_info",
  80         "x509_pkey",
  81         "x509_crl",
  82         "x509_req",
  83         "dsa",
  84         "rsa",
  85         "evp_pkey",
  86         "x509_store",
  87         "ssl_ctx",
  88         "ssl_cert",
  89         "ssl_session",
  90         "ssl_sess_cert",
  91         "ssl",
  92         "rand",
  93         "debug_malloc",
  94         "BIO",
  95         "gethostbyname",
  96         "getservbyname",
  97         "readdir",
  98         "RSA_blinding",
  99         "dh",
 100         "debug_malloc2",
 101         "dso",
 102         "dynlock",
 103 #if CRYPTO_NUM_LOCKS != 28
 104 # error "Inconsistency between crypto.h and cryptlib.c"
 105 #endif
 106         };
 107
 108 /* This is for applications to allocate new type names in the non-dynamic
 109    array of lock names.  These are numbered with positive numbers.  */
 110 static STACK *app_locks=NULL;
 111
 112 /* For applications that want a more dynamic way of handling threads, the
 113    following stack is used.  These are externally numbered with negative
 114    numbers.  */
 115 static STACK_OF(CRYPTO_dynlock) *dyn_locks=NULL;
 116
 117
 118 static void (MS_FAR *locking_callback)(int mode,int type,
 119         const char *file,int line)=NULL;
 120 static int (MS_FAR *add_lock_callback)(int *pointer,int amount,
 121         int type,const char *file,int line)=NULL;
 122 static unsigned long (MS_FAR *id_callback)(void)=NULL;
 123 static struct CRYPTO_dynlock_value *(MS_FAR *dynlock_create_callback)
 124         (const char *file,int line)=NULL;
 125 static void (MS_FAR *dynlock_lock_callback)(int mode,
 126         struct CRYPTO_dynlock_value *l, const char *file,int line)=NULL;
 127 static void (MS_FAR *dynlock_destroy_callback)(struct CRYPTO_dynlock_value *l,
 128         const char *file,int line)=NULL;
 129
 130 int CRYPTO_get_new_lockid(char *name)
 131         {
 132         char *str;
 133         int i;
 134
 135         /* A hack to make Visual C++ 5.0 work correctly when linking as
 136          * a DLL using /MT. Without this, the application cannot use
 137          * and floating point printf's.
 138          * It also seems to be needed for Visual C 1.5 (win16) */
 139 #if defined(WIN32) || defined(WIN16)
 140         SSLeay_MSVC5_hack=(double)name[0]*(double)name[1];
 141 #endif
 142
 143         if ((app_locks == NULL) && ((app_locks=sk_new_null()) == NULL))
 144                 {
 145                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID,ERR_R_MALLOC_FAILURE);
 146                 return(0);
 147                 }
 148         if ((str=BUF_strdup(name)) == NULL)
 149                 {
 150                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID,ERR_R_MALLOC_FAILURE);
 151                 return(0);
 152                 }
 153         i=sk_push(app_locks,str);
 154         if (!i)
 155                 OPENSSL_free(str);
 156         else
 157                 i+=CRYPTO_NUM_LOCKS; /* gap of one :-) */
 158         return(i);
 159         }
 160
 161 int CRYPTO_num_locks(void)
 162         {
 163         return CRYPTO_NUM_LOCKS;
 164         }
 165
 166 int CRYPTO_get_new_dynlockid(void)
 167         {
 168         int i = 0;
 169         CRYPTO_dynlock *pointer = NULL;
 170
 171         if (dynlock_create_callback == NULL)
 172                 {
 173                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,CRYPTO_R_NO_DYNLOCK_CREATE_CALLBACK);
 174                 return(0);
 175                 }
 176         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 177         if ((dyn_locks == NULL)
 178                 && ((dyn_locks=sk_CRYPTO_dynlock_new_null()) == NULL))
 179                 {
 180                 CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 181                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 182                 return(0);
 183                 }
 184         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 185
 186         pointer = (CRYPTO_dynlock *)OPENSSL_malloc(sizeof(CRYPTO_dynlock));
 187         if (pointer == NULL)
 188                 {
 189                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 190                 return(0);
 191                 }
 192         pointer->references = 1;
 193         pointer->data = dynlock_create_callback(__FILE__,__LINE__);
 194         if (pointer->data == NULL)
 195                 {
 196                 OPENSSL_free(pointer);
 197                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 198                 return(0);
 199                 }
 200
 201         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 202         /* First, try to find an existing empty slot */
 203         i=sk_CRYPTO_dynlock_find(dyn_locks,NULL);
 204         /* If there was none, push, thereby creating a new one */
 205         if (i == -1)
 206                 i=sk_CRYPTO_dynlock_push(dyn_locks,pointer);
 207         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 208
 209         if (!i)
 210                 {
 211                 dynlock_destroy_callback(pointer->data,__FILE__,__LINE__);
 212                 OPENSSL_free(pointer);
 213                 }
 214         else
 215                 i += 1; /* to avoid 0 */
 216         return -i;
 217         }
 218
 219 void CRYPTO_destroy_dynlockid(int i)
 220         {
 221         CRYPTO_dynlock *pointer = NULL;
 222         if (i)
 223                 i = -i-1;
 224         if (dynlock_destroy_callback == NULL)
 225                 return;
 226
 227         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 228
 229         if (dyn_locks == NULL || i >= sk_CRYPTO_dynlock_num(dyn_locks))
 230                 return;
 231         pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
 232         if (pointer != NULL)
 233                 {
 234                 --pointer->references;
 235 #ifdef REF_CHECK
 236                 if (pointer->references < 0)
 237                         {
 238                         fprintf(stderr,"CRYPTO_destroy_dynlockid, bad reference count\n");
 239                         abort();
 240                         }
 241                 else
 242 #endif
 243                         if (--(pointer->references) <= 0)
 244                                 {
 245                                 sk_CRYPTO_dynlock_set(dyn_locks, i, NULL);
 246                                 }
 247                         else
 248                                 pointer = NULL;
 249                 }
 250         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 251
 252         if (pointer)
 253                 {
 254                 dynlock_destroy_callback(pointer->data,__FILE__,__LINE__);
 255                 OPENSSL_free(pointer);
 256                 }
 257         }
 258
 259 struct CRYPTO_dynlock_value *CRYPTO_get_dynlock_value(int i)
 260         {
 261         CRYPTO_dynlock *pointer = NULL;
 262         if (i)
 263                 i = -i-1;
 264
 265         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 266
 267         if (dyn_locks != NULL && i < sk_CRYPTO_dynlock_num(dyn_locks))
 268                 pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
 269         if (pointer)
 270                 pointer->references++;
 271
 272         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 273
 274         if (pointer)
 275                 return pointer->data;
 276         return NULL;
 277         }
 278
 279 struct CRYPTO_dynlock_value *(*CRYPTO_get_dynlock_create_callback(void))
 280         (const char *file,int line)
 281         {
 282         return(dynlock_create_callback);
 283         }
 284
 285 void (*CRYPTO_get_dynlock_lock_callback(void))(int mode,
 286         struct CRYPTO_dynlock_value *l, const char *file,int line)
 287         {
 288         return(dynlock_lock_callback);
 289         }
 290
 291 void (*CRYPTO_get_dynlock_destroy_callback(void))
 292         (struct CRYPTO_dynlock_value *l, const char *file,int line)
 293         {
 294         return(dynlock_destroy_callback);
 295         }
 296
 297 void CRYPTO_set_dynlock_create_callback(struct CRYPTO_dynlock_value *(*func)
 298         (const char *file, int line))
 299         {
 300         dynlock_create_callback=func;
 301         }
 302
 303 void CRYPTO_set_dynlock_lock_callback(void (*func)(int mode,
 304         struct CRYPTO_dynlock_value *l, const char *file, int line))
 305         {
 306         dynlock_lock_callback=func;
 307         }
 308
 309 void CRYPTO_set_dynlock_destroy_callback(void (*func)
 310         (struct CRYPTO_dynlock_value *l, const char *file, int line))
 311         {
 312         dynlock_destroy_callback=func;
 313         }
 314
 315
 316 void (*CRYPTO_get_locking_callback(void))(int mode,int type,const char *file,
 317                 int line)
 318         {
 319         return(locking_callback);
 320         }
 321
 322 int (*CRYPTO_get_add_lock_callback(void))(int *num,int mount,int type,
 323                                           const char *file,int line)
 324         {
 325         return(add_lock_callback);
 326         }
 327
 328 void CRYPTO_set_locking_callback(void (*func)(int mode,int type,
 329                                               const char *file,int line))
 330         {
 331         locking_callback=func;
 332         }
 333
 334 void CRYPTO_set_add_lock_callback(int (*func)(int *num,int mount,int type,
 335                                               const char *file,int line))
 336         {
 337         add_lock_callback=func;
 338         }
 339
 340 unsigned long (*CRYPTO_get_id_callback(void))(void)
 341         {
 342         return(id_callback);
 343         }
 344
 345 void CRYPTO_set_id_callback(unsigned long (*func)(void))
 346         {
 347         id_callback=func;
 348         }
 349
 350 unsigned long CRYPTO_thread_id(void)
 351         {
 352         unsigned long ret=0;
 353
 354         if (id_callback == NULL)
 355                 {
 356 #ifdef WIN16
 357                 ret=(unsigned long)GetCurrentTask();
 358 #elif defined(WIN32)
 359                 ret=(unsigned long)GetCurrentThreadId();
 360 #elif defined(GETPID_IS_MEANINGLESS)
 361                 ret=1L;
 362 #else
 363                 ret=(unsigned long)getpid();
 364 #endif
 365                 }
 366         else
 367                 ret=id_callback();
 368         return(ret);
 369         }
 370
 371 void CRYPTO_lock(int mode, int type, const char *file, int line)
 372         {
 373 #ifdef LOCK_DEBUG
 374                 {
 375                 char *rw_text,*operation_text;
 376
 377                 if (mode & CRYPTO_LOCK)
 378                         operation_text="lock  ";
 379                 else if (mode & CRYPTO_UNLOCK)
 380                         operation_text="unlock";
 381                 else
 382                         operation_text="ERROR ";
 383
 384                 if (mode & CRYPTO_READ)
 385                         rw_text="r";
 386                 else if (mode & CRYPTO_WRITE)
 387                         rw_text="w";
 388                 else
 389                         rw_text="ERROR";
 390
 391                 fprintf(stderr,"lock:%08lx:(%s)%s %-18s %s:%d\n",
 392                         CRYPTO_thread_id(), rw_text, operation_text,
 393                         CRYPTO_get_lock_name(type), file, line);
 394                 }
 395 #endif
 396         if (type < 0)
 397                 {
 398                 int i = -type - 1;
 399                 struct CRYPTO_dynlock_value *pointer
 400                         = CRYPTO_get_dynlock_value(i);
 401
 402                 if (pointer)
 403                         {
 404                         dynlock_lock_callback(mode, pointer, file, line);
 405                         }
 406
 407                 CRYPTO_destroy_dynlockid(i);
 408                 }
 409         else
 410                 if (locking_callback != NULL)
 411                         locking_callback(mode,type,file,line);
 412         }
 413
 414 int CRYPTO_add_lock(int *pointer, int amount, int type, const char *file,
 415              int line)
 416         {
 417         int ret = 0;
 418
 419         if (add_lock_callback != NULL)
 420                 {
 421 #ifdef LOCK_DEBUG
 422                 int before= *pointer;
 423 #endif
 424
 425                 ret=add_lock_callback(pointer,amount,type,file,line);
 426 #ifdef LOCK_DEBUG
 427                 fprintf(stderr,"ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
 428                         CRYPTO_thread_id(),
 429                         before,amount,ret,
 430                         CRYPTO_get_lock_name(type),
 431                         file,line);
 432 #endif
 433                 *pointer=ret;
 434                 }
 435         else
 436                 {
 437                 CRYPTO_lock(CRYPTO_LOCK|CRYPTO_WRITE,type,file,line);
 438
 439                 ret= *pointer+amount;
 440 #ifdef LOCK_DEBUG
 441                 fprintf(stderr,"ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
 442                         CRYPTO_thread_id(),
 443                         *pointer,amount,ret,
 444                         CRYPTO_get_lock_name(type),
 445                         file,line);
 446 #endif
 447                 *pointer=ret;
 448                 CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_WRITE,type,file,line);
 449                 }
 450         return(ret);
 451         }
 452
 453 const char *CRYPTO_get_lock_name(int type)
 454         {
 455         if (type < 0)
 456                 return("dynamic");
 457         else if (type < CRYPTO_NUM_LOCKS)
 458                 return(lock_names[type]);
 459         else if (type-CRYPTO_NUM_LOCKS >= sk_num(app_locks))
 460                 return("ERROR");
 461         else
 462                 return(sk_value(app_locks,type-CRYPTO_NUM_LOCKS));
 463         }
 464
 465 #ifdef _DLL
 466 #ifdef WIN32
 467
 468 /* All we really need to do is remove the 'error' state when a thread
 469  * detaches */
 470
 471 BOOL WINAPI DLLEntryPoint(HINSTANCE hinstDLL, DWORD fdwReason,
 472              LPVOID lpvReserved)
 473         {
 474         switch(fdwReason)
 475                 {
 476         case DLL_PROCESS_ATTACH:
 477                 break;
 478         case DLL_THREAD_ATTACH:
 479                 break;
 480         case DLL_THREAD_DETACH:
 481                 ERR_remove_state(0);
 482                 break;
 483         case DLL_PROCESS_DETACH:
 484                 break;
 485                 }
 486         return(TRUE);
 487         }
 488 #endif
 489
 490 #endif