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         "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         "engine",
 104         "ui",
 105 #if CRYPTO_NUM_LOCKS != 30
 106 # error "Inconsistency between crypto.h and cryptlib.c"
 107 #endif
 108         };
 109
 110 /* This is for applications to allocate new type names in the non-dynamic
 111    array of lock names.  These are numbered with positive numbers.  */
 112 static STACK *app_locks=NULL;
 113
 114 /* For applications that want a more dynamic way of handling threads, the
 115    following stack is used.  These are externally numbered with negative
 116    numbers.  */
 117 static STACK_OF(CRYPTO_dynlock) *dyn_locks=NULL;
 118
 119
 120 static void (MS_FAR *locking_callback)(int mode,int type,
 121         const char *file,int line)=NULL;
 122 static int (MS_FAR *add_lock_callback)(int *pointer,int amount,
 123         int type,const char *file,int line)=NULL;
 124 static unsigned long (MS_FAR *id_callback)(void)=NULL;
 125 static struct CRYPTO_dynlock_value *(MS_FAR *dynlock_create_callback)
 126         (const char *file,int line)=NULL;
 127 static void (MS_FAR *dynlock_lock_callback)(int mode,
 128         struct CRYPTO_dynlock_value *l, const char *file,int line)=NULL;
 129 static void (MS_FAR *dynlock_destroy_callback)(struct CRYPTO_dynlock_value *l,
 130         const char *file,int line)=NULL;
 131
 132 int CRYPTO_get_new_lockid(char *name)
 133         {
 134         char *str;
 135         int i;
 136
 137 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_WIN16)
 138         /* A hack to make Visual C++ 5.0 work correctly when linking as
 139          * a DLL using /MT. Without this, the application cannot use
 140          * and floating point printf's.
 141          * It also seems to be needed for Visual C 1.5 (win16) */
 142         SSLeay_MSVC5_hack=(double)name[0]*(double)name[1];
 143 #endif
 144
 145         if ((app_locks == NULL) && ((app_locks=sk_new_null()) == NULL))
 146                 {
 147                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID,ERR_R_MALLOC_FAILURE);
 148                 return(0);
 149                 }
 150         if ((str=BUF_strdup(name)) == NULL)
 151                 {
 152                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID,ERR_R_MALLOC_FAILURE);
 153                 return(0);
 154                 }
 155         i=sk_push(app_locks,str);
 156         if (!i)
 157                 OPENSSL_free(str);
 158         else
 159                 i+=CRYPTO_NUM_LOCKS; /* gap of one :-) */
 160         return(i);
 161         }
 162
 163 int CRYPTO_num_locks(void)
 164         {
 165         return CRYPTO_NUM_LOCKS;
 166         }
 167
 168 int CRYPTO_get_new_dynlockid(void)
 169         {
 170         int i = 0;
 171         CRYPTO_dynlock *pointer = NULL;
 172
 173         if (dynlock_create_callback == NULL)
 174                 {
 175                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,CRYPTO_R_NO_DYNLOCK_CREATE_CALLBACK);
 176                 return(0);
 177                 }
 178         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 179         if ((dyn_locks == NULL)
 180                 && ((dyn_locks=sk_CRYPTO_dynlock_new_null()) == NULL))
 181                 {
 182                 CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 183                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 184                 return(0);
 185                 }
 186         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 187
 188         pointer = (CRYPTO_dynlock *)OPENSSL_malloc(sizeof(CRYPTO_dynlock));
 189         if (pointer == NULL)
 190                 {
 191                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 192                 return(0);
 193                 }
 194         pointer->references = 1;
 195         pointer->data = dynlock_create_callback(__FILE__,__LINE__);
 196         if (pointer->data == NULL)
 197                 {
 198                 OPENSSL_free(pointer);
 199                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 200                 return(0);
 201                 }
 202
 203         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 204         /* First, try to find an existing empty slot */
 205         i=sk_CRYPTO_dynlock_find(dyn_locks,NULL);
 206         /* If there was none, push, thereby creating a new one */
 207         if (i == -1)
 208                 i=sk_CRYPTO_dynlock_push(dyn_locks,pointer);
 209         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 210
 211         if (!i)
 212                 {
 213                 dynlock_destroy_callback(pointer->data,__FILE__,__LINE__);
 214                 OPENSSL_free(pointer);
 215                 }
 216         else
 217                 i += 1; /* to avoid 0 */
 218         return -i;
 219         }
 220
 221 void CRYPTO_destroy_dynlockid(int i)
 222         {
 223         CRYPTO_dynlock *pointer = NULL;
 224         if (i)
 225                 i = -i-1;
 226         if (dynlock_destroy_callback == NULL)
 227                 return;
 228
 229         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 230
 231         if (dyn_locks == NULL || i >= sk_CRYPTO_dynlock_num(dyn_locks))
 232                 return;
 233         pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
 234         if (pointer != NULL)
 235                 {
 236                 --pointer->references;
 237 #ifdef REF_CHECK
 238                 if (pointer->references < 0)
 239                         {
 240                         fprintf(stderr,"CRYPTO_destroy_dynlockid, bad reference count\n");
 241                         abort();
 242                         }
 243                 else
 244 #endif
 245                         if (pointer->references <= 0)
 246                                 {
 247                                 sk_CRYPTO_dynlock_set(dyn_locks, i, NULL);
 248                                 }
 249                         else
 250                                 pointer = NULL;
 251                 }
 252         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 253
 254         if (pointer)
 255                 {
 256                 dynlock_destroy_callback(pointer->data,__FILE__,__LINE__);
 257                 OPENSSL_free(pointer);
 258                 }
 259         }
 260
 261 struct CRYPTO_dynlock_value *CRYPTO_get_dynlock_value(int i)
 262         {
 263         CRYPTO_dynlock *pointer = NULL;
 264         if (i)
 265                 i = -i-1;
 266
 267         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 268
 269         if (dyn_locks != NULL && i < sk_CRYPTO_dynlock_num(dyn_locks))
 270                 pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
 271         if (pointer)
 272                 pointer->references++;
 273
 274         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 275
 276         if (pointer)
 277                 return pointer->data;
 278         return NULL;
 279         }
 280
 281 struct CRYPTO_dynlock_value *(*CRYPTO_get_dynlock_create_callback(void))
 282         (const char *file,int line)
 283         {
 284         return(dynlock_create_callback);
 285         }
 286
 287 void (*CRYPTO_get_dynlock_lock_callback(void))(int mode,
 288         struct CRYPTO_dynlock_value *l, const char *file,int line)
 289         {
 290         return(dynlock_lock_callback);
 291         }
 292
 293 void (*CRYPTO_get_dynlock_destroy_callback(void))
 294         (struct CRYPTO_dynlock_value *l, const char *file,int line)
 295         {
 296         return(dynlock_destroy_callback);
 297         }
 298
 299 void CRYPTO_set_dynlock_create_callback(struct CRYPTO_dynlock_value *(*func)
 300         (const char *file, int line))
 301         {
 302         dynlock_create_callback=func;
 303         }
 304
 305 void CRYPTO_set_dynlock_lock_callback(void (*func)(int mode,
 306         struct CRYPTO_dynlock_value *l, const char *file, int line))
 307         {
 308         dynlock_lock_callback=func;
 309         }
 310
 311 void CRYPTO_set_dynlock_destroy_callback(void (*func)
 312         (struct CRYPTO_dynlock_value *l, const char *file, int line))
 313         {
 314         dynlock_destroy_callback=func;
 315         }
 316
 317
 318 void (*CRYPTO_get_locking_callback(void))(int mode,int type,const char *file,
 319                 int line)
 320         {
 321         return(locking_callback);
 322         }
 323
 324 int (*CRYPTO_get_add_lock_callback(void))(int *num,int mount,int type,
 325                                           const char *file,int line)
 326         {
 327         return(add_lock_callback);
 328         }
 329
 330 void CRYPTO_set_locking_callback(void (*func)(int mode,int type,
 331                                               const char *file,int line))
 332         {
 333         locking_callback=func;
 334         }
 335
 336 void CRYPTO_set_add_lock_callback(int (*func)(int *num,int mount,int type,
 337                                               const char *file,int line))
 338         {
 339         add_lock_callback=func;
 340         }
 341
 342 unsigned long (*CRYPTO_get_id_callback(void))(void)
 343         {
 344         return(id_callback);
 345         }
 346
 347 void CRYPTO_set_id_callback(unsigned long (*func)(void))
 348         {
 349         id_callback=func;
 350         }
 351
 352 unsigned long CRYPTO_thread_id(void)
 353         {
 354         unsigned long ret=0;
 355
 356         if (id_callback == NULL)
 357                 {
 358 #ifdef OPENSSL_SYS_WIN16
 359                 ret=(unsigned long)GetCurrentTask();
 360 #elif defined(OPENSSL_SYS_WIN32)
 361                 ret=(unsigned long)GetCurrentThreadId();
 362 #elif defined(GETPID_IS_MEANINGLESS)
 363                 ret=1L;
 364 #else
 365                 ret=(unsigned long)getpid();
 366 #endif
 367                 }
 368         else
 369                 ret=id_callback();
 370         return(ret);
 371         }
 372
 373 void CRYPTO_lock(int mode, int type, const char *file, int line)
 374         {
 375 #ifdef LOCK_DEBUG
 376                 {
 377                 char *rw_text,*operation_text;
 378
 379                 if (mode & CRYPTO_LOCK)
 380                         operation_text="lock  ";
 381                 else if (mode & CRYPTO_UNLOCK)
 382                         operation_text="unlock";
 383                 else
 384                         operation_text="ERROR ";
 385
 386                 if (mode & CRYPTO_READ)
 387                         rw_text="r";
 388                 else if (mode & CRYPTO_WRITE)
 389                         rw_text="w";
 390                 else
 391                         rw_text="ERROR";
 392
 393                 fprintf(stderr,"lock:%08lx:(%s)%s %-18s %s:%d\n",
 394                         CRYPTO_thread_id(), rw_text, operation_text,
 395                         CRYPTO_get_lock_name(type), file, line);
 396                 }
 397 #endif
 398         if (type < 0)
 399                 {
 400                 int i = -type - 1;
 401                 struct CRYPTO_dynlock_value *pointer
 402                         = CRYPTO_get_dynlock_value(i);
 403
 404                 if (pointer && dynlock_lock_callback)
 405                         {
 406                         dynlock_lock_callback(mode, pointer, file, line);
 407                         }
 408
 409                 CRYPTO_destroy_dynlockid(i);
 410                 }
 411         else
 412                 if (locking_callback != NULL)
 413                         locking_callback(mode,type,file,line);
 414         }
 415
 416 int CRYPTO_add_lock(int *pointer, int amount, int type, const char *file,
 417              int line)
 418         {
 419         int ret = 0;
 420
 421         if (add_lock_callback != NULL)
 422                 {
 423 #ifdef LOCK_DEBUG
 424                 int before= *pointer;
 425 #endif
 426
 427                 ret=add_lock_callback(pointer,amount,type,file,line);
 428 #ifdef LOCK_DEBUG
 429                 fprintf(stderr,"ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
 430                         CRYPTO_thread_id(),
 431                         before,amount,ret,
 432                         CRYPTO_get_lock_name(type),
 433                         file,line);
 434 #endif
 435                 *pointer=ret;
 436                 }
 437         else
 438                 {
 439                 CRYPTO_lock(CRYPTO_LOCK|CRYPTO_WRITE,type,file,line);
 440
 441                 ret= *pointer+amount;
 442 #ifdef LOCK_DEBUG
 443                 fprintf(stderr,"ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
 444                         CRYPTO_thread_id(),
 445                         *pointer,amount,ret,
 446                         CRYPTO_get_lock_name(type),
 447                         file,line);
 448 #endif
 449                 *pointer=ret;
 450                 CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_WRITE,type,file,line);
 451                 }
 452         return(ret);
 453         }
 454
 455 const char *CRYPTO_get_lock_name(int type)
 456         {
 457         if (type < 0)
 458                 return("dynamic");
 459         else if (type < CRYPTO_NUM_LOCKS)
 460                 return(lock_names[type]);
 461         else if (type-CRYPTO_NUM_LOCKS >= sk_num(app_locks))
 462                 return("ERROR");
 463         else
 464                 return(sk_value(app_locks,type-CRYPTO_NUM_LOCKS));
 465         }
 466
 467 #ifdef _DLL
 468 #ifdef OPENSSL_SYS_WIN32
 469
 470 /* All we really need to do is remove the 'error' state when a thread
 471  * detaches */
 472
 473 BOOL WINAPI DLLEntryPoint(HINSTANCE hinstDLL, DWORD fdwReason,
 474              LPVOID lpvReserved)
 475         {
 476         switch(fdwReason)
 477                 {
 478         case DLL_PROCESS_ATTACH:
 479                 break;
 480         case DLL_THREAD_ATTACH:
 481                 break;
 482         case DLL_THREAD_DETACH:
 483                 ERR_remove_state(0);
 484                 break;
 485         case DLL_PROCESS_DETACH:
 486                 break;
 487                 }
 488         return(TRUE);
 489         }
 490 #endif
 491
 492 #endif