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(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_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         "ex_data",
  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         "rand2",
  94         "debug_malloc",
  95         "BIO",
  96         "gethostbyname",
  97         "getservbyname",
  98         "readdir",
  99         "RSA_blinding",
 100         "dh",
 101         "debug_malloc2",
 102         "dso",
 103         "dynlock",
 104         "engine",
 105         "ui",
 106         "ecdsa",
 107         "ec",
 108 #if CRYPTO_NUM_LOCKS != 33
 109 # error "Inconsistency between crypto.h and cryptlib.c"
 110 #endif
 111         };
 112
 113 /* This is for applications to allocate new type names in the non-dynamic
 114    array of lock names.  These are numbered with positive numbers.  */
 115 static STACK *app_locks=NULL;
 116
 117 /* For applications that want a more dynamic way of handling threads, the
 118    following stack is used.  These are externally numbered with negative
 119    numbers.  */
 120 static STACK_OF(CRYPTO_dynlock) *dyn_locks=NULL;
 121
 122
 123 static void (MS_FAR *locking_callback)(int mode,int type,
 124         const char *file,int line)=NULL;
 125 static int (MS_FAR *add_lock_callback)(int *pointer,int amount,
 126         int type,const char *file,int line)=NULL;
 127 static unsigned long (MS_FAR *id_callback)(void)=NULL;
 128 static struct CRYPTO_dynlock_value *(MS_FAR *dynlock_create_callback)
 129         (const char *file,int line)=NULL;
 130 static void (MS_FAR *dynlock_lock_callback)(int mode,
 131         struct CRYPTO_dynlock_value *l, const char *file,int line)=NULL;
 132 static void (MS_FAR *dynlock_destroy_callback)(struct CRYPTO_dynlock_value *l,
 133         const char *file,int line)=NULL;
 134
 135 int CRYPTO_get_new_lockid(char *name)
 136         {
 137         char *str;
 138         int i;
 139
 140 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_WIN16)
 141         /* A hack to make Visual C++ 5.0 work correctly when linking as
 142          * a DLL using /MT. Without this, the application cannot use
 143          * and floating point printf's.
 144          * It also seems to be needed for Visual C 1.5 (win16) */
 145         SSLeay_MSVC5_hack=(double)name[0]*(double)name[1];
 146 #endif
 147
 148         if ((app_locks == NULL) && ((app_locks=sk_new_null()) == NULL))
 149                 {
 150                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID,ERR_R_MALLOC_FAILURE);
 151                 return(0);
 152                 }
 153         if ((str=BUF_strdup(name)) == NULL)
 154                 {
 155                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID,ERR_R_MALLOC_FAILURE);
 156                 return(0);
 157                 }
 158         i=sk_push(app_locks,str);
 159         if (!i)
 160                 OPENSSL_free(str);
 161         else
 162                 i+=CRYPTO_NUM_LOCKS; /* gap of one :-) */
 163         return(i);
 164         }
 165
 166 int CRYPTO_num_locks(void)
 167         {
 168         return CRYPTO_NUM_LOCKS;
 169         }
 170
 171 int CRYPTO_get_new_dynlockid(void)
 172         {
 173         int i = 0;
 174         CRYPTO_dynlock *pointer = NULL;
 175
 176         if (dynlock_create_callback == NULL)
 177                 {
 178                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,CRYPTO_R_NO_DYNLOCK_CREATE_CALLBACK);
 179                 return(0);
 180                 }
 181         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 182         if ((dyn_locks == NULL)
 183                 && ((dyn_locks=sk_CRYPTO_dynlock_new_null()) == NULL))
 184                 {
 185                 CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 186                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 187                 return(0);
 188                 }
 189         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 190
 191         pointer = (CRYPTO_dynlock *)OPENSSL_malloc(sizeof(CRYPTO_dynlock));
 192         if (pointer == NULL)
 193                 {
 194                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 195                 return(0);
 196                 }
 197         pointer->references = 1;
 198         pointer->data = dynlock_create_callback(__FILE__,__LINE__);
 199         if (pointer->data == NULL)
 200                 {
 201                 OPENSSL_free(pointer);
 202                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 203                 return(0);
 204                 }
 205
 206         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 207         /* First, try to find an existing empty slot */
 208         i=sk_CRYPTO_dynlock_find(dyn_locks,NULL);
 209         /* If there was none, push, thereby creating a new one */
 210         if (i == -1)
 211                 i=sk_CRYPTO_dynlock_push(dyn_locks,pointer);
 212         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 213
 214         if (!i)
 215                 {
 216                 dynlock_destroy_callback(pointer->data,__FILE__,__LINE__);
 217                 OPENSSL_free(pointer);
 218                 }
 219         else
 220                 i += 1; /* to avoid 0 */
 221         return -i;
 222         }
 223
 224 void CRYPTO_destroy_dynlockid(int i)
 225         {
 226         CRYPTO_dynlock *pointer = NULL;
 227         if (i)
 228                 i = -i-1;
 229         if (dynlock_destroy_callback == NULL)
 230                 return;
 231
 232         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 233
 234         if (dyn_locks == NULL || i >= sk_CRYPTO_dynlock_num(dyn_locks))
 235                 {
 236                 CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 237                 return;
 238                 }
 239         pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
 240         if (pointer != NULL)
 241                 {
 242                 --pointer->references;
 243 #ifdef REF_CHECK
 244                 if (pointer->references < 0)
 245                         {
 246                         fprintf(stderr,"CRYPTO_destroy_dynlockid, bad reference count\n");
 247                         abort();
 248                         }
 249                 else
 250 #endif
 251                         if (pointer->references <= 0)
 252                                 {
 253                                 sk_CRYPTO_dynlock_set(dyn_locks, i, NULL);
 254                                 }
 255                         else
 256                                 pointer = NULL;
 257                 }
 258         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 259
 260         if (pointer)
 261                 {
 262                 dynlock_destroy_callback(pointer->data,__FILE__,__LINE__);
 263                 OPENSSL_free(pointer);
 264                 }
 265         }
 266
 267 struct CRYPTO_dynlock_value *CRYPTO_get_dynlock_value(int i)
 268         {
 269         CRYPTO_dynlock *pointer = NULL;
 270         if (i)
 271                 i = -i-1;
 272
 273         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 274
 275         if (dyn_locks != NULL && i < sk_CRYPTO_dynlock_num(dyn_locks))
 276                 pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
 277         if (pointer)
 278                 pointer->references++;
 279
 280         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 281
 282         if (pointer)
 283                 return pointer->data;
 284         return NULL;
 285         }
 286
 287 struct CRYPTO_dynlock_value *(*CRYPTO_get_dynlock_create_callback(void))
 288         (const char *file,int line)
 289         {
 290         return(dynlock_create_callback);
 291         }
 292
 293 void (*CRYPTO_get_dynlock_lock_callback(void))(int mode,
 294         struct CRYPTO_dynlock_value *l, const char *file,int line)
 295         {
 296         return(dynlock_lock_callback);
 297         }
 298
 299 void (*CRYPTO_get_dynlock_destroy_callback(void))
 300         (struct CRYPTO_dynlock_value *l, const char *file,int line)
 301         {
 302         return(dynlock_destroy_callback);
 303         }
 304
 305 void CRYPTO_set_dynlock_create_callback(struct CRYPTO_dynlock_value *(*func)
 306         (const char *file, int line))
 307         {
 308         dynlock_create_callback=func;
 309         }
 310
 311 void CRYPTO_set_dynlock_lock_callback(void (*func)(int mode,
 312         struct CRYPTO_dynlock_value *l, const char *file, int line))
 313         {
 314         dynlock_lock_callback=func;
 315         }
 316
 317 void CRYPTO_set_dynlock_destroy_callback(void (*func)
 318         (struct CRYPTO_dynlock_value *l, const char *file, int line))
 319         {
 320         dynlock_destroy_callback=func;
 321         }
 322
 323
 324 void (*CRYPTO_get_locking_callback(void))(int mode,int type,const char *file,
 325                 int line)
 326         {
 327         return(locking_callback);
 328         }
 329
 330 int (*CRYPTO_get_add_lock_callback(void))(int *num,int mount,int type,
 331                                           const char *file,int line)
 332         {
 333         return(add_lock_callback);
 334         }
 335
 336 void CRYPTO_set_locking_callback(void (*func)(int mode,int type,
 337                                               const char *file,int line))
 338         {
 339         locking_callback=func;
 340         }
 341
 342 void CRYPTO_set_add_lock_callback(int (*func)(int *num,int mount,int type,
 343                                               const char *file,int line))
 344         {
 345         add_lock_callback=func;
 346         }
 347
 348 unsigned long (*CRYPTO_get_id_callback(void))(void)
 349         {
 350         return(id_callback);
 351         }
 352
 353 void CRYPTO_set_id_callback(unsigned long (*func)(void))
 354         {
 355         id_callback=func;
 356         }
 357
 358 unsigned long CRYPTO_thread_id(void)
 359         {
 360         unsigned long ret=0;
 361
 362         if (id_callback == NULL)
 363                 {
 364 #ifdef OPENSSL_SYS_WIN16
 365                 ret=(unsigned long)GetCurrentTask();
 366 #elif defined(OPENSSL_SYS_WIN32)
 367                 ret=(unsigned long)GetCurrentThreadId();
 368 #elif defined(GETPID_IS_MEANINGLESS)
 369                 ret=1L;
 370 #else
 371                 ret=(unsigned long)getpid();
 372 #endif
 373                 }
 374         else
 375                 ret=id_callback();
 376         return(ret);
 377         }
 378
 379 void CRYPTO_lock(int mode, int type, const char *file, int line)
 380         {
 381 #ifdef LOCK_DEBUG
 382                 {
 383                 char *rw_text,*operation_text;
 384
 385                 if (mode & CRYPTO_LOCK)
 386                         operation_text="lock  ";
 387                 else if (mode & CRYPTO_UNLOCK)
 388                         operation_text="unlock";
 389                 else
 390                         operation_text="ERROR ";
 391
 392                 if (mode & CRYPTO_READ)
 393                         rw_text="r";
 394                 else if (mode & CRYPTO_WRITE)
 395                         rw_text="w";
 396                 else
 397                         rw_text="ERROR";
 398
 399                 fprintf(stderr,"lock:%08lx:(%s)%s %-18s %s:%d\n",
 400                         CRYPTO_thread_id(), rw_text, operation_text,
 401                         CRYPTO_get_lock_name(type), file, line);
 402                 }
 403 #endif
 404         if (type < 0)
 405                 {
 406                 struct CRYPTO_dynlock_value *pointer
 407                         = CRYPTO_get_dynlock_value(type);
 408
 409                 if (pointer && dynlock_lock_callback)
 410                         {
 411                         dynlock_lock_callback(mode, pointer, file, line);
 412                         }
 413
 414                 CRYPTO_destroy_dynlockid(type);
 415                 }
 416         else
 417                 if (locking_callback != NULL)
 418                         locking_callback(mode,type,file,line);
 419         }
 420
 421 int CRYPTO_add_lock(int *pointer, int amount, int type, const char *file,
 422              int line)
 423         {
 424         int ret = 0;
 425
 426         if (add_lock_callback != NULL)
 427                 {
 428 #ifdef LOCK_DEBUG
 429                 int before= *pointer;
 430 #endif
 431
 432                 ret=add_lock_callback(pointer,amount,type,file,line);
 433 #ifdef LOCK_DEBUG
 434                 fprintf(stderr,"ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
 435                         CRYPTO_thread_id(),
 436                         before,amount,ret,
 437                         CRYPTO_get_lock_name(type),
 438                         file,line);
 439 #endif
 440                 }
 441         else
 442                 {
 443                 CRYPTO_lock(CRYPTO_LOCK|CRYPTO_WRITE,type,file,line);
 444
 445                 ret= *pointer+amount;
 446 #ifdef LOCK_DEBUG
 447                 fprintf(stderr,"ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
 448                         CRYPTO_thread_id(),
 449                         *pointer,amount,ret,
 450                         CRYPTO_get_lock_name(type),
 451                         file,line);
 452 #endif
 453                 *pointer=ret;
 454                 CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_WRITE,type,file,line);
 455                 }
 456         return(ret);
 457         }
 458
 459 const char *CRYPTO_get_lock_name(int type)
 460         {
 461         if (type < 0)
 462                 return("dynamic");
 463         else if (type < CRYPTO_NUM_LOCKS)
 464                 return(lock_names[type]);
 465         else if (type-CRYPTO_NUM_LOCKS >= sk_num(app_locks))
 466                 return("ERROR");
 467         else
 468                 return(sk_value(app_locks,type-CRYPTO_NUM_LOCKS));
 469         }
 470
 471 #ifdef _DLL
 472 #ifdef OPENSSL_SYS_WIN32
 473
 474 /* All we really need to do is remove the 'error' state when a thread
 475  * detaches */
 476
 477 BOOL WINAPI DLLEntryPoint(HINSTANCE hinstDLL, DWORD fdwReason,
 478              LPVOID lpvReserved)
 479         {
 480         switch(fdwReason)
 481                 {
 482         case DLL_PROCESS_ATTACH:
 483                 break;
 484         case DLL_THREAD_ATTACH:
 485                 break;
 486         case DLL_THREAD_DETACH:
 487                 ERR_remove_state(0);
 488                 break;
 489         case DLL_PROCESS_DETACH:
 490                 break;
 491                 }
 492         return(TRUE);
 493         }
 494 #endif
 495
 496 #endif