crypto/ex_data.c

   1 /* crypto/ex_data.c */
   2
   3 /*
   4  * This is not thread-safe, nor can it be changed to become thread-safe
   5  * without changing various function prototypes and using a lot of locking.
   6  * Luckily, it's not really used anywhere except in ssl_verify_cert_chain
   7  * via SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c), where
   8  * new_func, dup_func, and free_func all are 0.
   9  *
  10  * Any multi-threaded application crazy enough to use ex_data for its own
  11  * purposes had better make sure that SSL_get_ex_data_X509_STORE_CTX_idx
  12  * is called once before multiple threads are created.
  13  */
  14
  15 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  16  * All rights reserved.
  17  *
  18  * This package is an SSL implementation written
  19  * by Eric Young (eay@cryptsoft.com).
  20  * The implementation was written so as to conform with Netscapes SSL.
  21  *
  22  * This library is free for commercial and non-commercial use as long as
  23  * the following conditions are aheared to.  The following conditions
  24  * apply to all code found in this distribution, be it the RC4, RSA,
  25  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  26  * included with this distribution is covered by the same copyright terms
  27  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  28  *
  29  * Copyright remains Eric Young's, and as such any Copyright notices in
  30  * the code are not to be removed.
  31  * If this package is used in a product, Eric Young should be given attribution
  32  * as the author of the parts of the library used.
  33  * This can be in the form of a textual message at program startup or
  34  * in documentation (online or textual) provided with the package.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  * 3. All advertising materials mentioning features or use of this software
  45  *    must display the following acknowledgement:
  46  *    "This product includes cryptographic software written by
  47  *     Eric Young (eay@cryptsoft.com)"
  48  *    The word 'cryptographic' can be left out if the rouines from the library
  49  *    being used are not cryptographic related :-).
  50  * 4. If you include any Windows specific code (or a derivative thereof) from
  51  *    the apps directory (application code) you must include an acknowledgement:
  52  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  * The licence and distribution terms for any publically available version or
  67  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  68  * copied and put under another distribution licence
  69  * [including the GNU Public Licence.]
  70  */
  71
  72 #include <stdio.h>
  73 #include <stdlib.h>
  74 #include <openssl/buffer.h>
  75 #include <openssl/bio.h>
  76 #include <openssl/lhash.h>
  77 #include "cryptlib.h"
  78
  79 int CRYPTO_get_ex_new_index(int idx, STACK_OF(CRYPTO_EX_DATA_FUNCS) **skp, long argl, void *argp,
  80              CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
  81         {
  82         int ret= -1;
  83         CRYPTO_EX_DATA_FUNCS *a;
  84
  85         MemCheck_off();
  86         if (*skp == NULL)
  87                 *skp=sk_CRYPTO_EX_DATA_FUNCS_new_null();
  88         if (*skp == NULL)
  89                 {
  90                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_EX_NEW_INDEX,ERR_R_MALLOC_FAILURE);
  91                 goto err;
  92                 }
  93         a=(CRYPTO_EX_DATA_FUNCS *)OPENSSL_malloc(sizeof(CRYPTO_EX_DATA_FUNCS));
  94         if (a == NULL)
  95                 {
  96                 CRYPTOerr(CRYPTO_F_CRYPTO_GET_EX_NEW_INDEX,ERR_R_MALLOC_FAILURE);
  97                 goto err;
  98                 }
  99         a->argl=argl;
 100         a->argp=argp;
 101         a->new_func=new_func;
 102         a->dup_func=dup_func;
 103         a->free_func=free_func;
 104         while (sk_CRYPTO_EX_DATA_FUNCS_num(*skp) <= idx)
 105                 {
 106                 if (!sk_CRYPTO_EX_DATA_FUNCS_push(*skp,NULL))
 107                         {
 108                         CRYPTOerr(CRYPTO_F_CRYPTO_GET_EX_NEW_INDEX,ERR_R_MALLOC_FAILURE);
 109                         OPENSSL_free(a);
 110                         goto err;
 111                         }
 112                 }
 113         sk_CRYPTO_EX_DATA_FUNCS_set(*skp,idx, a);
 114         ret=idx;
 115 err:
 116         MemCheck_on();
 117         return(ret);
 118         }
 119
 120 int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int idx, void *val)
 121         {
 122         int i;
 123
 124         if (ad->sk == NULL)
 125                 {
 126                 if ((ad->sk=sk_new_null()) == NULL)
 127                         {
 128                         CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA,ERR_R_MALLOC_FAILURE);
 129                         return(0);
 130                         }
 131                 }
 132         i=sk_num(ad->sk);
 133
 134         while (i <= idx)
 135                 {
 136                 if (!sk_push(ad->sk,NULL))
 137                         {
 138                         CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA,ERR_R_MALLOC_FAILURE);
 139                         return(0);
 140                         }
 141                 i++;
 142                 }
 143         sk_set(ad->sk,idx,val);
 144         return(1);
 145         }
 146
 147 void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx)
 148         {
 149         if (ad->sk == NULL)
 150                 return(0);
 151         else if (idx >= sk_num(ad->sk))
 152                 return(0);
 153         else
 154                 return(sk_value(ad->sk,idx));
 155         }
 156
 157 /* The callback is called with the 'object', which is the original data object
 158  * being duplicated, a pointer to the
 159  * 'new' object to be inserted, the index, and the argi/argp
 160  */
 161 int CRYPTO_dup_ex_data(STACK_OF(CRYPTO_EX_DATA_FUNCS) *meth, CRYPTO_EX_DATA *to,
 162              CRYPTO_EX_DATA *from)
 163         {
 164         int i,j,m,r;
 165         CRYPTO_EX_DATA_FUNCS *mm;
 166         char *from_d;
 167
 168         if (meth == NULL) return(1);
 169         if (from->sk == NULL) return(1);
 170         m=sk_CRYPTO_EX_DATA_FUNCS_num(meth);
 171         j=sk_num(from->sk);
 172         for (i=0; i<j; i++)
 173                 {
 174                 from_d=CRYPTO_get_ex_data(from,i);
 175                 if (i < m)
 176                         {
 177                         mm=sk_CRYPTO_EX_DATA_FUNCS_value(meth,i);
 178                         if (mm->dup_func != NULL)
 179                                 r=mm->dup_func(to,from,(char **)&from_d,i,
 180                                         mm->argl,mm->argp);
 181                         }
 182                 CRYPTO_set_ex_data(to,i,from_d);
 183                 }
 184         return(1);
 185         }
 186
 187 /* Call each free callback */
 188 void CRYPTO_free_ex_data(STACK_OF(CRYPTO_EX_DATA_FUNCS) *meth, void *obj, CRYPTO_EX_DATA *ad)
 189         {
 190         CRYPTO_EX_DATA_FUNCS *m;
 191         void *ptr;
 192         int i,max;
 193
 194         if (meth != NULL)
 195                 {
 196                 max=sk_CRYPTO_EX_DATA_FUNCS_num(meth);
 197                 for (i=0; i<max; i++)
 198                         {
 199                         m=sk_CRYPTO_EX_DATA_FUNCS_value(meth,i);
 200                         if ((m != NULL) && (m->free_func != NULL))
 201                                 {
 202                                 ptr=CRYPTO_get_ex_data(ad,i);
 203                                 m->free_func(obj,ptr,ad,i,m->argl,m->argp);
 204                                 }
 205                         }
 206                 }
 207         if (ad->sk != NULL)
 208                 {
 209                 sk_free(ad->sk);
 210                 ad->sk=NULL;
 211                 }
 212         }
 213
 214 void CRYPTO_new_ex_data(STACK_OF(CRYPTO_EX_DATA_FUNCS) *meth, void *obj, CRYPTO_EX_DATA *ad)
 215         {
 216         CRYPTO_EX_DATA_FUNCS *m;
 217         void *ptr;
 218         int i,max;
 219
 220         ad->sk=NULL;
 221         if (meth != NULL)
 222                 {
 223                 max=sk_CRYPTO_EX_DATA_FUNCS_num(meth);
 224                 for (i=0; i<max; i++)
 225                         {
 226                         m=sk_CRYPTO_EX_DATA_FUNCS_value(meth,i);
 227                         if ((m != NULL) && (m->new_func != NULL))
 228                                 {
 229                                 ptr=CRYPTO_get_ex_data(ad,i);
 230                                 m->new_func(obj,ptr,ad,i,m->argl,m->argp);
 231                                 }
 232                         }
 233                 }
 234         }
 235
 236 IMPLEMENT_STACK_OF(CRYPTO_EX_DATA_FUNCS)