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         "engine",
 104 #if CRYPTO_NUM_LOCKS != 29
 105 # error "Inconsistency between crypto.h and cryptlib.c"
 106 #endif
 107         };
 108
 109 /* This is for applications to allocate new type names in the non-dynamic
 110    array of lock names.  These are numbered with positive numbers.  */
 111 static STACK *app_locks=NULL;
 112
 113 /* For applications that want a more dynamic way of handling threads, the
 114    following stack is used.  These are externally numbered with negative
 115    numbers.  */
 116 static STACK_OF(CRYPTO_dynlock) *dyn_locks=NULL;
 117
 118
 119 static void (MS_FAR *locking_callback)(int mode,int type,
 120         const char *file,int line)=NULL;
 121 static int (MS_FAR *add_lock_callback)(int *pointer,int amount,
 122         int type,const char *file,int line)=NULL;
 123 static unsigned long (MS_FAR *id_callback)(void)=NULL;
 124 static struct CRYPTO_dynlock_value *(MS_FAR *dynlock_create_callback)
 125         (const char *file,int line)=NULL;
 126 static void (MS_FAR *dynlock_lock_callback)(int mode,
 127         struct CRYPTO_dynlock_value *l, const char *file,int line)=NULL;
 128 static void (MS_FAR *dynlock_destroy_callback)(struct CRYPTO_dynlock_value *l,
 129         const char *file,int line)=NULL;
 130
 131 int CRYPTO_get_new_lockid(char *name)
 132         {
 133         char *str;
 134         int i;
 135
 136 #if defined(WIN32) || defined(WIN16)
 137         /* A hack to make Visual C++ 5.0 work correctly when linking as
 138          * a DLL using /MT. Without this, the application cannot use
 139          * and floating point printf's.
 140          * It also seems to be needed for Visual C 1.5 (win16) */
 141         SSLeay_MSVC5_hack=(double)name[0]*(double)name[1];
 142 #endif
 143
 144         if ((app_locks == NULL) && ((app_locks=sk_new_null()) == NULL))
 145                 {
 146                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID,ERR_R_MALLOC_FAILURE);
 147                 return(0);
 148                 }
 149         if ((str=BUF_strdup(name)) == NULL)
 150                 {
 151                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID,ERR_R_MALLOC_FAILURE);
 152                 return(0);
 153                 }
 154         i=sk_push(app_locks,str);
 155         if (!i)
 156                 OPENSSL_free(str);
 157         else
 158                 i+=CRYPTO_NUM_LOCKS; /* gap of one :-) */
 159         return(i);
 160         }
 161
 162 int CRYPTO_num_locks(void)
 163         {
 164         return CRYPTO_NUM_LOCKS;
 165         }
 166
 167 int CRYPTO_get_new_dynlockid(void)
 168         {
 169         int i = 0;
 170         CRYPTO_dynlock *pointer = NULL;
 171
 172         if (dynlock_create_callback == NULL)
 173                 {
 174                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,CRYPTO_R_NO_DYNLOCK_CREATE_CALLBACK);
 175                 return(0);
 176                 }
 177         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 178         if ((dyn_locks == NULL)
 179                 && ((dyn_locks=sk_CRYPTO_dynlock_new_null()) == NULL))
 180                 {
 181                 CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 182                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 183                 return(0);
 184                 }
 185         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 186
 187         pointer = (CRYPTO_dynlock *)OPENSSL_malloc(sizeof(CRYPTO_dynlock));
 188         if (pointer == NULL)
 189                 {
 190                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 191                 return(0);
 192                 }
 193         pointer->references = 1;
 194         pointer->data = dynlock_create_callback(__FILE__,__LINE__);
 195         if (pointer->data == NULL)
 196                 {
 197                 OPENSSL_free(pointer);
 198                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 199                 return(0);
 200                 }
 201
 202         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 203         /* First, try to find an existing empty slot */
 204         i=sk_CRYPTO_dynlock_find(dyn_locks,NULL);
 205         /* If there was none, push, thereby creating a new one */
 206         if (i == -1)
 207                 i=sk_CRYPTO_dynlock_push(dyn_locks,pointer);
 208         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 209
 210         if (!i)
 211                 {
 212                 dynlock_destroy_callback(pointer->data,__FILE__,__LINE__);
 213                 OPENSSL_free(pointer);
 214                 }
 215         else
 216                 i += 1; /* to avoid 0 */
 217         return -i;
 218         }
 219
 220 void CRYPTO_destroy_dynlockid(int i)
 221         {
 222         CRYPTO_dynlock *pointer = NULL;
 223         if (i)
 224                 i = -i-1;
 225         if (dynlock_destroy_callback == NULL)
 226                 return;
 227
 228         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 229
 230         if (dyn_locks == NULL || i >= sk_CRYPTO_dynlock_num(dyn_locks))
 231                 return;
 232         pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
 233         if (pointer != NULL)
 234                 {
 235                 --pointer->references;
 236 #ifdef REF_CHECK
 237                 if (pointer->references < 0)
 238                         {
 239                         fprintf(stderr,"CRYPTO_destroy_dynlockid, bad reference count\n");
 240                         abort();
 241                         }
 242                 else
 243 #endif
 244                         if (--(pointer->references) <= 0)
 245                                 {
 246                                 sk_CRYPTO_dynlock_set(dyn_locks, i, NULL);
 247                                 }
 248                         else
 249                                 pointer = NULL;
 250                 }
 251         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 252
 253         if (pointer)
 254                 {
 255                 dynlock_destroy_callback(pointer->data,__FILE__,__LINE__);
 256                 OPENSSL_free(pointer);
 257                 }
 258         }
 259
 260 struct CRYPTO_dynlock_value *CRYPTO_get_dynlock_value(int i)
 261         {
 262         CRYPTO_dynlock *pointer = NULL;
 263         if (i)
 264                 i = -i-1;
 265
 266         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 267
 268         if (dyn_locks != NULL && i < sk_CRYPTO_dynlock_num(dyn_locks))
 269                 pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
 270         if (pointer)
 271                 pointer->references++;
 272
 273         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 274
 275         if (pointer)
 276                 return pointer->data;
 277         return NULL;
 278         }
 279
 280 struct CRYPTO_dynlock_value *(*CRYPTO_get_dynlock_create_callback(void))
 281         (const char *file,int line)
 282         {
 283         return(dynlock_create_callback);
 284         }
 285
 286 void (*CRYPTO_get_dynlock_lock_callback(void))(int mode,
 287         struct CRYPTO_dynlock_value *l, const char *file,int line)
 288         {
 289         return(dynlock_lock_callback);
 290         }
 291
 292 void (*CRYPTO_get_dynlock_destroy_callback(void))
 293         (struct CRYPTO_dynlock_value *l, const char *file,int line)
 294         {
 295         return(dynlock_destroy_callback);
 296         }
 297
 298 void CRYPTO_set_dynlock_create_callback(struct CRYPTO_dynlock_value *(*func)
 299         (const char *file, int line))
 300         {
 301         dynlock_create_callback=func;
 302         }
 303
 304 void CRYPTO_set_dynlock_lock_callback(void (*func)(int mode,
 305         struct CRYPTO_dynlock_value *l, const char *file, int line))
 306         {
 307         dynlock_lock_callback=func;
 308         }
 309
 310 void CRYPTO_set_dynlock_destroy_callback(void (*func)
 311         (struct CRYPTO_dynlock_value *l, const char *file, int line))
 312         {
 313         dynlock_destroy_callback=func;
 314         }
 315
 316
 317 void (*CRYPTO_get_locking_callback(void))(int mode,int type,const char *file,
 318                 int line)
 319         {
 320         return(locking_callback);
 321         }
 322
 323 int (*CRYPTO_get_add_lock_callback(void))(int *num,int mount,int type,
 324                                           const char *file,int line)
 325         {
 326         return(add_lock_callback);
 327         }
 328
 329 void CRYPTO_set_locking_callback(void (*func)(int mode,int type,
 330                                               const char *file,int line))
 331         {
 332         locking_callback=func;
 333         }
 334
 335 void CRYPTO_set_add_lock_callback(int (*func)(int *num,int mount,int type,
 336                                               const char *file,int line))
 337         {
 338         add_lock_callback=func;
 339         }
 340
 341 unsigned long (*CRYPTO_get_id_callback(void))(void)
 342         {
 343         return(id_callback);
 344         }
 345
 346 void CRYPTO_set_id_callback(unsigned long (*func)(void))
 347         {
 348         id_callback=func;
 349         }
 350
 351 unsigned long CRYPTO_thread_id(void)
 352         {
 353         unsigned long ret=0;
 354
 355         if (id_callback == NULL)
 356                 {
 357 #ifdef WIN16
 358                 ret=(unsigned long)GetCurrentTask();
 359 #elif defined(WIN32)
 360                 ret=(unsigned long)GetCurrentThreadId();
 361 #elif defined(GETPID_IS_MEANINGLESS)
 362                 ret=1L;
 363 #else
 364                 ret=(unsigned long)getpid();
 365 #endif
 366                 }
 367         else
 368                 ret=id_callback();
 369         return(ret);
 370         }
 371
 372 void CRYPTO_lock(int mode, int type, const char *file, int line)
 373         {
 374 #ifdef LOCK_DEBUG
 375                 {
 376                 char *rw_text,*operation_text;
 377
 378                 if (mode & CRYPTO_LOCK)
 379                         operation_text="lock  ";
 380                 else if (mode & CRYPTO_UNLOCK)
 381                         operation_text="unlock";
 382                 else
 383                         operation_text="ERROR ";
 384
 385                 if (mode & CRYPTO_READ)
 386                         rw_text="r";
 387                 else if (mode & CRYPTO_WRITE)
 388                         rw_text="w";
 389                 else
 390                         rw_text="ERROR";
 391
 392                 fprintf(stderr,"lock:%08lx:(%s)%s %-18s %s:%d\n",
 393                         CRYPTO_thread_id(), rw_text, operation_text,
 394                         CRYPTO_get_lock_name(type), file, line);
 395                 }
 396 #endif
 397         if (type < 0)
 398                 {
 399                 int i = -type - 1;
 400                 struct CRYPTO_dynlock_value *pointer
 401                         = CRYPTO_get_dynlock_value(i);
 402
 403                 if (pointer)
 404                         {
 405                         dynlock_lock_callback(mode, pointer, file, line);
 406                         }
 407
 408                 CRYPTO_destroy_dynlockid(i);
 409                 }
 410         else
 411                 if (locking_callback != NULL)
 412                         locking_callback(mode,type,file,line);
 413         }
 414
 415 int CRYPTO_add_lock(int *pointer, int amount, int type, const char *file,
 416              int line)
 417         {
 418         int ret = 0;
 419
 420         if (add_lock_callback != NULL)
 421                 {
 422 #ifdef LOCK_DEBUG
 423                 int before= *pointer;
 424 #endif
 425
 426                 ret=add_lock_callback(pointer,amount,type,file,line);
 427 #ifdef LOCK_DEBUG
 428                 fprintf(stderr,"ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
 429                         CRYPTO_thread_id(),
 430                         before,amount,ret,
 431                         CRYPTO_get_lock_name(type),
 432                         file,line);
 433 #endif
 434                 *pointer=ret;
 435                 }
 436         else
 437                 {
 438                 CRYPTO_lock(CRYPTO_LOCK|CRYPTO_WRITE,type,file,line);
 439
 440                 ret= *pointer+amount;
 441 #ifdef LOCK_DEBUG
 442                 fprintf(stderr,"ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
 443                         CRYPTO_thread_id(),
 444                         *pointer,amount,ret,
 445                         CRYPTO_get_lock_name(type),
 446                         file,line);
 447 #endif
 448                 *pointer=ret;
 449                 CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_WRITE,type,file,line);
 450                 }
 451         return(ret);
 452         }
 453
 454 const char *CRYPTO_get_lock_name(int type)
 455         {
 456         if (type < 0)
 457                 return("dynamic");
 458         else if (type < CRYPTO_NUM_LOCKS)
 459                 return(lock_names[type]);
 460         else if (type-CRYPTO_NUM_LOCKS >= sk_num(app_locks))
 461                 return("ERROR");
 462         else
 463                 return(sk_value(app_locks,type-CRYPTO_NUM_LOCKS));
 464         }
 465
 466 #ifdef _DLL
 467 #ifdef WIN32
 468
 469 /* All we really need to do is remove the 'error' state when a thread
 470  * detaches */
 471
 472 BOOL WINAPI DLLEntryPoint(HINSTANCE hinstDLL, DWORD fdwReason,
 473              LPVOID lpvReserved)
 474         {
 475         switch(fdwReason)
 476                 {
 477         case DLL_PROCESS_ATTACH:
 478                 break;
 479         case DLL_THREAD_ATTACH:
 480                 break;
 481         case DLL_THREAD_DETACH:
 482                 ERR_remove_state(0);
 483                 break;
 484         case DLL_PROCESS_DETACH:
 485                 break;
 486                 }
 487         return(TRUE);
 488         }
 489 #endif
 490
 491 #endif