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 #if CRYPTO_NUM_LOCKS != 31
 107 # error "Inconsistency between crypto.h and cryptlib.c"
 108 #endif
 109         };
 110
 111 /* This is for applications to allocate new type names in the non-dynamic
 112    array of lock names.  These are numbered with positive numbers.  */
 113 static STACK *app_locks=NULL;
 114
 115 /* For applications that want a more dynamic way of handling threads, the
 116    following stack is used.  These are externally numbered with negative
 117    numbers.  */
 118 static STACK_OF(CRYPTO_dynlock) *dyn_locks=NULL;
 119
 120
 121 static void (MS_FAR *locking_callback)(int mode,int type,
 122         const char *file,int line)=NULL;
 123 static int (MS_FAR *add_lock_callback)(int *pointer,int amount,
 124         int type,const char *file,int line)=NULL;
 125 static unsigned long (MS_FAR *id_callback)(void)=NULL;
 126 static struct CRYPTO_dynlock_value *(MS_FAR *dynlock_create_callback)
 127         (const char *file,int line)=NULL;
 128 static void (MS_FAR *dynlock_lock_callback)(int mode,
 129         struct CRYPTO_dynlock_value *l, const char *file,int line)=NULL;
 130 static void (MS_FAR *dynlock_destroy_callback)(struct CRYPTO_dynlock_value *l,
 131         const char *file,int line)=NULL;
 132
 133 int CRYPTO_get_new_lockid(char *name)
 134         {
 135         char *str;
 136         int i;
 137
 138 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_WIN16)
 139         /* A hack to make Visual C++ 5.0 work correctly when linking as
 140          * a DLL using /MT. Without this, the application cannot use
 141          * and floating point printf's.
 142          * It also seems to be needed for Visual C 1.5 (win16) */
 143         SSLeay_MSVC5_hack=(double)name[0]*(double)name[1];
 144 #endif
 145
 146         if ((app_locks == NULL) && ((app_locks=sk_new_null()) == NULL))
 147                 {
 148                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID,ERR_R_MALLOC_FAILURE);
 149                 return(0);
 150                 }
 151         if ((str=BUF_strdup(name)) == NULL)
 152                 {
 153                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID,ERR_R_MALLOC_FAILURE);
 154                 return(0);
 155                 }
 156         i=sk_push(app_locks,str);
 157         if (!i)
 158                 OPENSSL_free(str);
 159         else
 160                 i+=CRYPTO_NUM_LOCKS; /* gap of one :-) */
 161         return(i);
 162         }
 163
 164 int CRYPTO_num_locks(void)
 165         {
 166         return CRYPTO_NUM_LOCKS;
 167         }
 168
 169 int CRYPTO_get_new_dynlockid(void)
 170         {
 171         int i = 0;
 172         CRYPTO_dynlock *pointer = NULL;
 173
 174         if (dynlock_create_callback == NULL)
 175                 {
 176                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,CRYPTO_R_NO_DYNLOCK_CREATE_CALLBACK);
 177                 return(0);
 178                 }
 179         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 180         if ((dyn_locks == NULL)
 181                 && ((dyn_locks=sk_CRYPTO_dynlock_new_null()) == NULL))
 182                 {
 183                 CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 184                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 185                 return(0);
 186                 }
 187         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 188
 189         pointer = (CRYPTO_dynlock *)OPENSSL_malloc(sizeof(CRYPTO_dynlock));
 190         if (pointer == NULL)
 191                 {
 192                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 193                 return(0);
 194                 }
 195         pointer->references = 1;
 196         pointer->data = dynlock_create_callback(__FILE__,__LINE__);
 197         if (pointer->data == NULL)
 198                 {
 199                 OPENSSL_free(pointer);
 200                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,ERR_R_MALLOC_FAILURE);
 201                 return(0);
 202                 }
 203
 204         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 205         /* First, try to find an existing empty slot */
 206         i=sk_CRYPTO_dynlock_find(dyn_locks,NULL);
 207         /* If there was none, push, thereby creating a new one */
 208         if (i == -1)
 209                 i=sk_CRYPTO_dynlock_push(dyn_locks,pointer);
 210         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 211
 212         if (!i)
 213                 {
 214                 dynlock_destroy_callback(pointer->data,__FILE__,__LINE__);
 215                 OPENSSL_free(pointer);
 216                 }
 217         else
 218                 i += 1; /* to avoid 0 */
 219         return -i;
 220         }
 221
 222 void CRYPTO_destroy_dynlockid(int i)
 223         {
 224         CRYPTO_dynlock *pointer = NULL;
 225         if (i)
 226                 i = -i-1;
 227         if (dynlock_destroy_callback == NULL)
 228                 return;
 229
 230         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 231
 232         if (dyn_locks == NULL || i >= sk_CRYPTO_dynlock_num(dyn_locks))
 233                 {
 234                 CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 235                 return;
 236                 }
 237         pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
 238         if (pointer != NULL)
 239                 {
 240                 --pointer->references;
 241 #ifdef REF_CHECK
 242                 if (pointer->references < 0)
 243                         {
 244                         fprintf(stderr,"CRYPTO_destroy_dynlockid, bad reference count\n");
 245                         abort();
 246                         }
 247                 else
 248 #endif
 249                         if (pointer->references <= 0)
 250                                 {
 251                                 sk_CRYPTO_dynlock_set(dyn_locks, i, NULL);
 252                                 }
 253                         else
 254                                 pointer = NULL;
 255                 }
 256         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 257
 258         if (pointer)
 259                 {
 260                 dynlock_destroy_callback(pointer->data,__FILE__,__LINE__);
 261                 OPENSSL_free(pointer);
 262                 }
 263         }
 264
 265 struct CRYPTO_dynlock_value *CRYPTO_get_dynlock_value(int i)
 266         {
 267         CRYPTO_dynlock *pointer = NULL;
 268         if (i)
 269                 i = -i-1;
 270
 271         CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
 272
 273         if (dyn_locks != NULL && i < sk_CRYPTO_dynlock_num(dyn_locks))
 274                 pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
 275         if (pointer)
 276                 pointer->references++;
 277
 278         CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
 279
 280         if (pointer)
 281                 return pointer->data;
 282         return NULL;
 283         }
 284
 285 struct CRYPTO_dynlock_value *(*CRYPTO_get_dynlock_create_callback(void))
 286         (const char *file,int line)
 287         {
 288         return(dynlock_create_callback);
 289         }
 290
 291 void (*CRYPTO_get_dynlock_lock_callback(void))(int mode,
 292         struct CRYPTO_dynlock_value *l, const char *file,int line)
 293         {
 294         return(dynlock_lock_callback);
 295         }
 296
 297 void (*CRYPTO_get_dynlock_destroy_callback(void))
 298         (struct CRYPTO_dynlock_value *l, const char *file,int line)
 299         {
 300         return(dynlock_destroy_callback);
 301         }
 302
 303 void CRYPTO_set_dynlock_create_callback(struct CRYPTO_dynlock_value *(*func)
 304         (const char *file, int line))
 305         {
 306         dynlock_create_callback=func;
 307         }
 308
 309 void CRYPTO_set_dynlock_lock_callback(void (*func)(int mode,
 310         struct CRYPTO_dynlock_value *l, const char *file, int line))
 311         {
 312         dynlock_lock_callback=func;
 313         }
 314
 315 void CRYPTO_set_dynlock_destroy_callback(void (*func)
 316         (struct CRYPTO_dynlock_value *l, const char *file, int line))
 317         {
 318         dynlock_destroy_callback=func;
 319         }
 320
 321
 322 void (*CRYPTO_get_locking_callback(void))(int mode,int type,const char *file,
 323                 int line)
 324         {
 325         return(locking_callback);
 326         }
 327
 328 int (*CRYPTO_get_add_lock_callback(void))(int *num,int mount,int type,
 329                                           const char *file,int line)
 330         {
 331         return(add_lock_callback);
 332         }
 333
 334 void CRYPTO_set_locking_callback(void (*func)(int mode,int type,
 335                                               const char *file,int line))
 336         {
 337         locking_callback=func;
 338         }
 339
 340 void CRYPTO_set_add_lock_callback(int (*func)(int *num,int mount,int type,
 341                                               const char *file,int line))
 342         {
 343         add_lock_callback=func;
 344         }
 345
 346 unsigned long (*CRYPTO_get_id_callback(void))(void)
 347         {
 348         return(id_callback);
 349         }
 350
 351 void CRYPTO_set_id_callback(unsigned long (*func)(void))
 352         {
 353         id_callback=func;
 354         }
 355
 356 unsigned long CRYPTO_thread_id(void)
 357         {
 358         unsigned long ret=0;
 359
 360         if (id_callback == NULL)
 361                 {
 362 #ifdef OPENSSL_SYS_WIN16
 363                 ret=(unsigned long)GetCurrentTask();
 364 #elif defined(OPENSSL_SYS_WIN32)
 365                 ret=(unsigned long)GetCurrentThreadId();
 366 #elif defined(GETPID_IS_MEANINGLESS)
 367                 ret=1L;
 368 #else
 369                 ret=(unsigned long)getpid();
 370 #endif
 371                 }
 372         else
 373                 ret=id_callback();
 374         return(ret);
 375         }
 376
 377 void CRYPTO_lock(int mode, int type, const char *file, int line)
 378         {
 379 #ifdef LOCK_DEBUG
 380                 {
 381                 char *rw_text,*operation_text;
 382
 383                 if (mode & CRYPTO_LOCK)
 384                         operation_text="lock  ";
 385                 else if (mode & CRYPTO_UNLOCK)
 386                         operation_text="unlock";
 387                 else
 388                         operation_text="ERROR ";
 389
 390                 if (mode & CRYPTO_READ)
 391                         rw_text="r";
 392                 else if (mode & CRYPTO_WRITE)
 393                         rw_text="w";
 394                 else
 395                         rw_text="ERROR";
 396
 397                 fprintf(stderr,"lock:%08lx:(%s)%s %-18s %s:%d\n",
 398                         CRYPTO_thread_id(), rw_text, operation_text,
 399                         CRYPTO_get_lock_name(type), file, line);
 400                 }
 401 #endif
 402         if (type < 0)
 403                 {
 404                 struct CRYPTO_dynlock_value *pointer
 405                         = CRYPTO_get_dynlock_value(type);
 406
 407                 if (pointer && dynlock_lock_callback)
 408                         {
 409                         dynlock_lock_callback(mode, pointer, file, line);
 410                         }
 411
 412                 CRYPTO_destroy_dynlockid(type);
 413                 }
 414         else
 415                 if (locking_callback != NULL)
 416                         locking_callback(mode,type,file,line);
 417         }
 418
 419 int CRYPTO_add_lock(int *pointer, int amount, int type, const char *file,
 420              int line)
 421         {
 422         int ret = 0;
 423
 424         if (add_lock_callback != NULL)
 425                 {
 426 #ifdef LOCK_DEBUG
 427                 int before= *pointer;
 428 #endif
 429
 430                 ret=add_lock_callback(pointer,amount,type,file,line);
 431 #ifdef LOCK_DEBUG
 432                 fprintf(stderr,"ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
 433                         CRYPTO_thread_id(),
 434                         before,amount,ret,
 435                         CRYPTO_get_lock_name(type),
 436                         file,line);
 437 #endif
 438                 }
 439         else
 440                 {
 441                 CRYPTO_lock(CRYPTO_LOCK|CRYPTO_WRITE,type,file,line);
 442
 443                 ret= *pointer+amount;
 444 #ifdef LOCK_DEBUG
 445                 fprintf(stderr,"ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
 446                         CRYPTO_thread_id(),
 447                         *pointer,amount,ret,
 448                         CRYPTO_get_lock_name(type),
 449                         file,line);
 450 #endif
 451                 *pointer=ret;
 452                 CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_WRITE,type,file,line);
 453                 }
 454         return(ret);
 455         }
 456
 457 const char *CRYPTO_get_lock_name(int type)
 458         {
 459         if (type < 0)
 460                 return("dynamic");
 461         else if (type < CRYPTO_NUM_LOCKS)
 462                 return(lock_names[type]);
 463         else if (type-CRYPTO_NUM_LOCKS >= sk_num(app_locks))
 464                 return("ERROR");
 465         else
 466                 return(sk_value(app_locks,type-CRYPTO_NUM_LOCKS));
 467         }
 468
 469 #ifdef _DLL
 470 #ifdef OPENSSL_SYS_WIN32
 471
 472 /* All we really need to do is remove the 'error' state when a thread
 473  * detaches */
 474
 475 BOOL WINAPI DLLEntryPoint(HINSTANCE hinstDLL, DWORD fdwReason,
 476              LPVOID lpvReserved)
 477         {
 478         switch(fdwReason)
 479                 {
 480         case DLL_PROCESS_ATTACH:
 481                 break;
 482         case DLL_THREAD_ATTACH:
 483                 break;
 484         case DLL_THREAD_DETACH:
 485                 ERR_remove_state(0);
 486                 break;
 487         case DLL_PROCESS_DETACH:
 488                 break;
 489                 }
 490         return(TRUE);
 491         }
 492 #endif
 493
 494 #endif