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         "ssl_method",
  93         "rand",
  94         "rand2",
  95         "debug_malloc",
  96         "BIO",
  97         "gethostbyname",
  98         "getservbyname",
  99         "readdir",
 100         "RSA_blinding",
 101         "dh",
 102         "debug_malloc2",
 103         "dso",
 104         "dynlock",
 105         "engine",
 106         "ui",
 107 #if CRYPTO_NUM_LOCKS != 32
 108 # error "Inconsistency between crypto.h and cryptlib.c"
 109 #endif
 110         };
 111
 112 /* This is for applications to allocate new type names in the non-dynamic
 113    array of lock names.  These are numbered with positive numbers.  */
 114 static STACK *app_locks=NULL;
 115
 116 /* For applications that want a more dynamic way of handling threads, the
 117    following stack is used.  These are externally numbered with negative
 118    numbers.  */
 119 static STACK_OF(CRYPTO_dynlock) *dyn_locks=NULL;
 120
 121
 122 static void (MS_FAR *locking_callback)(int mode,int type,
 123         const char *file,int line)=NULL;
 124 static int (MS_FAR *add_lock_callback)(int *pointer,int amount,
 125         int type,const char *file,int line)=NULL;
 126 static unsigned long (MS_FAR *id_callback)(void)=NULL;
 127 static struct CRYPTO_dynlock_value *(MS_FAR *dynlock_create_callback)
 128         (const char *file,int line)=NULL;
 129 static void (MS_FAR *dynlock_lock_callback)(int mode,
 130         struct CRYPTO_dynlock_value *l, const char *file,int line)=NULL;
 131 static void (MS_FAR *dynlock_destroy_callback)(struct CRYPTO_dynlock_value *l,
 132         const char *file,int line)=NULL;
 133
 134 int CRYPTO_get_new_lockid(char *name)
 135         {
 136         char *str;
 137         int i;
 138
 139 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_WIN16)
 140         /* A hack to make Visual C++ 5.0 work correctly when linking as
 141          * a DLL using /MT. Without this, the application cannot use
 142          * and floating point printf's.
 143          * It also seems to be needed for Visual C 1.5 (win16) */
 144         SSLeay_MSVC5_hack=(double)name[0]*(double)name[1];
 145 #endif
 146
 147         if ((app_locks == NULL) && ((app_locks=sk_new_null()) == NULL))
 148                 {
 149                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID,ERR_R_MALLOC_FAILURE);
 150                 return(0);
 151                 }
 152         if ((str=BUF_strdup(name)) == NULL)
 153                 {
 154                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID,ERR_R_MALLOC_FAILURE);
 155                 return(0);
 156                 }
 157         i=sk_push(app_locks,str);
 158         if (!i)
 159                 OPENSSL_free(str);
 160         else
 161                 i+=CRYPTO_NUM_LOCKS; /* gap of one :-) */
 162         return(i);
 163         }
 164
 165 int CRYPTO_num_locks(void)
 166         {
 167         return CRYPTO_NUM_LOCKS;
 168         }
 169
 170 int CRYPTO_get_new_dynlockid(void)
 171         {
 172         int i = 0;
 173         CRYPTO_dynlock *pointer = NULL;
 174
 175         if (dynlock_create_callback == NULL)
 176                 {
 177                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,CRYPTO_R_NO_DYNLOCK_CREATE_CALLBACK);
 178                 return(0);
 179                 }
 180         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 181         if ((dyn_locks == NULL)
 182                 && ((dyn_locks=sk_CRYPTO_dynlock_new_null()) == NULL))
 183                 {
 184                 CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 185                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 186                 return(0);
 187                 }
 188         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 189
 190         pointer = (CRYPTO_dynlock *)OPENSSL_malloc(sizeof(CRYPTO_dynlock));
 191         if (pointer == NULL)
 192                 {
 193                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 194                 return(0);
 195                 }
 196         pointer->references = 1;
 197         pointer->data = dynlock_create_callback(__FILE__,__LINE__);
 198         if (pointer->data == NULL)
 199                 {
 200                 OPENSSL_free(pointer);
 201                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 202                 return(0);
 203                 }
 204
 205         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 206         /* First, try to find an existing empty slot */
 207         i=sk_CRYPTO_dynlock_find(dyn_locks,NULL);
 208         /* If there was none, push, thereby creating a new one */
 209         if (i == -1)
 210                 i=sk_CRYPTO_dynlock_push(dyn_locks,pointer);
 211         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 212
 213         if (!i)
 214                 {
 215                 dynlock_destroy_callback(pointer->data,__FILE__,__LINE__);
 216                 OPENSSL_free(pointer);
 217                 }
 218         else
 219                 i += 1; /* to avoid 0 */
 220         return -i;
 221         }
 222
 223 void CRYPTO_destroy_dynlockid(int i)
 224         {
 225         CRYPTO_dynlock *pointer = NULL;
 226         if (i)
 227                 i = -i-1;
 228         if (dynlock_destroy_callback == NULL)
 229                 return;
 230
 231         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 232
 233         if (dyn_locks == NULL || i >= sk_CRYPTO_dynlock_num(dyn_locks))
 234                 {
 235                 CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 236                 return;
 237                 }
 238         pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
 239         if (pointer != NULL)
 240                 {
 241                 --pointer->references;
 242 #ifdef REF_CHECK
 243                 if (pointer->references < 0)
 244                         {
 245                         fprintf(stderr,"CRYPTO_destroy_dynlockid, bad reference count\n");
 246                         abort();
 247                         }
 248                 else
 249 #endif
 250                         if (pointer->references <= 0)
 251                                 {
 252                                 sk_CRYPTO_dynlock_set(dyn_locks, i, NULL);
 253                                 }
 254                         else
 255                                 pointer = NULL;
 256                 }
 257         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 258
 259         if (pointer)
 260                 {
 261                 dynlock_destroy_callback(pointer->data,__FILE__,__LINE__);
 262                 OPENSSL_free(pointer);
 263                 }
 264         }
 265
 266 struct CRYPTO_dynlock_value *CRYPTO_get_dynlock_value(int i)
 267         {
 268         CRYPTO_dynlock *pointer = NULL;
 269         if (i)
 270                 i = -i-1;
 271
 272         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 273
 274         if (dyn_locks != NULL && i < sk_CRYPTO_dynlock_num(dyn_locks))
 275                 pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
 276         if (pointer)
 277                 pointer->references++;
 278
 279         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 280
 281         if (pointer)
 282                 return pointer->data;
 283         return NULL;
 284         }
 285
 286 struct CRYPTO_dynlock_value *(*CRYPTO_get_dynlock_create_callback(void))
 287         (const char *file,int line)
 288         {
 289         return(dynlock_create_callback);
 290         }
 291
 292 void (*CRYPTO_get_dynlock_lock_callback(void))(int mode,
 293         struct CRYPTO_dynlock_value *l, const char *file,int line)
 294         {
 295         return(dynlock_lock_callback);
 296         }
 297
 298 void (*CRYPTO_get_dynlock_destroy_callback(void))
 299         (struct CRYPTO_dynlock_value *l, const char *file,int line)
 300         {
 301         return(dynlock_destroy_callback);
 302         }
 303
 304 void CRYPTO_set_dynlock_create_callback(struct CRYPTO_dynlock_value *(*func)
 305         (const char *file, int line))
 306         {
 307         dynlock_create_callback=func;
 308         }
 309
 310 void CRYPTO_set_dynlock_lock_callback(void (*func)(int mode,
 311         struct CRYPTO_dynlock_value *l, const char *file, int line))
 312         {
 313         dynlock_lock_callback=func;
 314         }
 315
 316 void CRYPTO_set_dynlock_destroy_callback(void (*func)
 317         (struct CRYPTO_dynlock_value *l, const char *file, int line))
 318         {
 319         dynlock_destroy_callback=func;
 320         }
 321
 322
 323 void (*CRYPTO_get_locking_callback(void))(int mode,int type,const char *file,
 324                 int line)
 325         {
 326         return(locking_callback);
 327         }
 328
 329 int (*CRYPTO_get_add_lock_callback(void))(int *num,int mount,int type,
 330                                           const char *file,int line)
 331         {
 332         return(add_lock_callback);
 333         }
 334
 335 void CRYPTO_set_locking_callback(void (*func)(int mode,int type,
 336                                               const char *file,int line))
 337         {
 338         locking_callback=func;
 339         }
 340
 341 void CRYPTO_set_add_lock_callback(int (*func)(int *num,int mount,int type,
 342                                               const char *file,int line))
 343         {
 344         add_lock_callback=func;
 345         }
 346
 347 unsigned long (*CRYPTO_get_id_callback(void))(void)
 348         {
 349         return(id_callback);
 350         }
 351
 352 void CRYPTO_set_id_callback(unsigned long (*func)(void))
 353         {
 354         id_callback=func;
 355         }
 356
 357 unsigned long CRYPTO_thread_id(void)
 358         {
 359         unsigned long ret=0;
 360
 361         if (id_callback == NULL)
 362                 {
 363 #ifdef OPENSSL_SYS_WIN16
 364                 ret=(unsigned long)GetCurrentTask();
 365 #elif defined(OPENSSL_SYS_WIN32)
 366                 ret=(unsigned long)GetCurrentThreadId();
 367 #elif defined(GETPID_IS_MEANINGLESS)
 368                 ret=1L;
 369 #else
 370                 ret=(unsigned long)getpid();
 371 #endif
 372                 }
 373         else
 374                 ret=id_callback();
 375         return(ret);
 376         }
 377
 378 void CRYPTO_lock(int mode, int type, const char *file, int line)
 379         {
 380 #ifdef LOCK_DEBUG
 381                 {
 382                 char *rw_text,*operation_text;
 383
 384                 if (mode & CRYPTO_LOCK)
 385                         operation_text="lock  ";
 386                 else if (mode & CRYPTO_UNLOCK)
 387                         operation_text="unlock";
 388                 else
 389                         operation_text="ERROR ";
 390
 391                 if (mode & CRYPTO_READ)
 392                         rw_text="r";
 393                 else if (mode & CRYPTO_WRITE)
 394                         rw_text="w";
 395                 else
 396                         rw_text="ERROR";
 397
 398                 fprintf(stderr,"lock:%08lx:(%s)%s %-18s %s:%d\n",
 399                         CRYPTO_thread_id(), rw_text, operation_text,
 400                         CRYPTO_get_lock_name(type), file, line);
 401                 }
 402 #endif
 403         if (type < 0)
 404                 {
 405                 struct CRYPTO_dynlock_value *pointer
 406                         = CRYPTO_get_dynlock_value(type);
 407
 408                 if (pointer && dynlock_lock_callback)
 409                         {
 410                         dynlock_lock_callback(mode, pointer, file, line);
 411                         }
 412
 413                 CRYPTO_destroy_dynlockid(type);
 414                 }
 415         else
 416                 if (locking_callback != NULL)
 417                         locking_callback(mode,type,file,line);
 418         }
 419
 420 int CRYPTO_add_lock(int *pointer, int amount, int type, const char *file,
 421              int line)
 422         {
 423         int ret = 0;
 424
 425         if (add_lock_callback != NULL)
 426                 {
 427 #ifdef LOCK_DEBUG
 428                 int before= *pointer;
 429 #endif
 430
 431                 ret=add_lock_callback(pointer,amount,type,file,line);
 432 #ifdef LOCK_DEBUG
 433                 fprintf(stderr,"ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
 434                         CRYPTO_thread_id(),
 435                         before,amount,ret,
 436                         CRYPTO_get_lock_name(type),
 437                         file,line);
 438 #endif
 439                 }
 440         else
 441                 {
 442                 CRYPTO_lock(CRYPTO_LOCK|CRYPTO_WRITE,type,file,line);
 443
 444                 ret= *pointer+amount;
 445 #ifdef LOCK_DEBUG
 446                 fprintf(stderr,"ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
 447                         CRYPTO_thread_id(),
 448                         *pointer,amount,ret,
 449                         CRYPTO_get_lock_name(type),
 450                         file,line);
 451 #endif
 452                 *pointer=ret;
 453                 CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_WRITE,type,file,line);
 454                 }
 455         return(ret);
 456         }
 457
 458 const char *CRYPTO_get_lock_name(int type)
 459         {
 460         if (type < 0)
 461                 return("dynamic");
 462         else if (type < CRYPTO_NUM_LOCKS)
 463                 return(lock_names[type]);
 464         else if (type-CRYPTO_NUM_LOCKS > sk_num(app_locks))
 465                 return("ERROR");
 466         else
 467                 return(sk_value(app_locks,type-CRYPTO_NUM_LOCKS));
 468         }
 469
 470 #ifdef _DLL
 471 #ifdef OPENSSL_SYS_WIN32
 472
 473 /* All we really need to do is remove the 'error' state when a thread
 474  * detaches */
 475
 476 BOOL WINAPI DLLEntryPoint(HINSTANCE hinstDLL, DWORD fdwReason,
 477              LPVOID lpvReserved)
 478         {
 479         switch(fdwReason)
 480                 {
 481         case DLL_PROCESS_ATTACH:
 482                 break;
 483         case DLL_THREAD_ATTACH:
 484                 break;
 485         case DLL_THREAD_DETACH:
 486                 ERR_remove_state(0);
 487                 break;
 488         case DLL_PROCESS_DETACH:
 489                 break;
 490                 }
 491         return(TRUE);
 492         }
 493 #endif
 494
 495 #endif
 496
 497 void OpenSSLDie(const char *file,int line,const char *assertion)
 498         {
 499         fprintf(stderr,
 500                 "%s(%d): OpenSSL internal error, assertion failed: %s\n",
 501                 file,line,assertion);
 502         abort();
 503         }