crypto/asn1/tasn_fre.c

   1 /* tasn_fre.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 2000.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59
  60 #include <stddef.h>
  61 #include <openssl/asn1.h>
  62 #include <openssl/asn1t.h>
  63 #include <openssl/objects.h>
  64
  65 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine);
  66
  67 /* Free up an ASN1 structure */
  68
  69 void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
  70         {
  71         asn1_item_combine_free(&val, it, 0);
  72         }
  73
  74 void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
  75         {
  76         asn1_item_combine_free(pval, it, 0);
  77         }
  78
  79 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine)
  80         {
  81         const ASN1_TEMPLATE *tt = NULL, *seqtt;
  82         const ASN1_EXTERN_FUNCS *ef;
  83         const ASN1_COMPAT_FUNCS *cf;
  84         const ASN1_AUX *aux = it->funcs;
  85         ASN1_aux_cb *asn1_cb;
  86         int i;
  87         if (!pval)
  88                 return;
  89         if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
  90                 return;
  91         if (aux && aux->asn1_cb)
  92                 asn1_cb = aux->asn1_cb;
  93         else
  94                 asn1_cb = 0;
  95
  96         switch(it->itype)
  97                 {
  98
  99                 case ASN1_ITYPE_PRIMITIVE:
 100                 if (it->templates)
 101                         ASN1_template_free(pval, it->templates);
 102                 else
 103                         ASN1_primitive_free(pval, it);
 104                 break;
 105
 106                 case ASN1_ITYPE_MSTRING:
 107                 ASN1_primitive_free(pval, it);
 108                 break;
 109
 110                 case ASN1_ITYPE_CHOICE:
 111                 if (asn1_cb)
 112                         {
 113                         i = asn1_cb(ASN1_OP_FREE_PRE, pval, it);
 114                         if (i == 2)
 115                                 return;
 116                         }
 117                 i = asn1_get_choice_selector(pval, it);
 118                 if (asn1_cb)
 119                         asn1_cb(ASN1_OP_FREE_PRE, pval, it);
 120                 if ((i >= 0) && (i < it->tcount))
 121                         {
 122                         ASN1_VALUE **pchval;
 123                         tt = it->templates + i;
 124                         pchval = asn1_get_field_ptr(pval, tt);
 125                         ASN1_template_free(pchval, tt);
 126                         }
 127                 if (asn1_cb)
 128                         asn1_cb(ASN1_OP_FREE_POST, pval, it);
 129                 if (!combine)
 130                         {
 131                         OPENSSL_free(*pval);
 132                         *pval = NULL;
 133                         }
 134                 break;
 135
 136                 case ASN1_ITYPE_COMPAT:
 137                 cf = it->funcs;
 138                 if (cf && cf->asn1_free)
 139                         cf->asn1_free(*pval);
 140                 break;
 141
 142                 case ASN1_ITYPE_EXTERN:
 143                 ef = it->funcs;
 144                 if (ef && ef->asn1_ex_free)
 145                         ef->asn1_ex_free(pval, it);
 146                 break;
 147
 148                 case ASN1_ITYPE_NDEF_SEQUENCE:
 149                 case ASN1_ITYPE_SEQUENCE:
 150                 if (asn1_do_lock(pval, -1, it) > 0)
 151                         return;
 152                 if (asn1_cb)
 153                         {
 154                         i = asn1_cb(ASN1_OP_FREE_PRE, pval, it);
 155                         if (i == 2)
 156                                 return;
 157                         }
 158                 asn1_enc_free(pval, it);
 159                 /* If we free up as normal we will invalidate any
 160                  * ANY DEFINED BY field and we wont be able to
 161                  * determine the type of the field it defines. So
 162                  * free up in reverse order.
 163                  */
 164                 tt = it->templates + it->tcount - 1;
 165                 for (i = 0; i < it->tcount; tt--, i++)
 166                         {
 167                         ASN1_VALUE **pseqval;
 168                         seqtt = asn1_do_adb(pval, tt, 0);
 169                         if (!seqtt)
 170                                 continue;
 171                         pseqval = asn1_get_field_ptr(pval, seqtt);
 172                         ASN1_template_free(pseqval, seqtt);
 173                         }
 174                 if (asn1_cb)
 175                         asn1_cb(ASN1_OP_FREE_POST, pval, it);
 176                 if (!combine)
 177                         {
 178                         OPENSSL_free(*pval);
 179                         *pval = NULL;
 180                         }
 181                 break;
 182                 }
 183         }
 184
 185 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 186         {
 187         int i;
 188         if (tt->flags & ASN1_TFLG_SK_MASK)
 189                 {
 190                 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
 191                 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++)
 192                         {
 193                         ASN1_VALUE *vtmp;
 194                         vtmp = sk_ASN1_VALUE_value(sk, i);
 195                         asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item),
 196                                                                         0);
 197                         }
 198                 sk_ASN1_VALUE_free(sk);
 199                 *pval = NULL;
 200                 }
 201         else
 202                 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item),
 203                                                 tt->flags & ASN1_TFLG_COMBINE);
 204         }
 205
 206 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
 207         {
 208         int utype;
 209         if (it)
 210                 {
 211                 const ASN1_PRIMITIVE_FUNCS *pf;
 212                 pf = it->funcs;
 213                 if (pf && pf->prim_free)
 214                         {
 215                         pf->prim_free(pval, it);
 216                         return;
 217                         }
 218                 }
 219         /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
 220         if (!it)
 221                 {
 222                 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
 223                 utype = typ->type;
 224                 pval = (ASN1_VALUE **)&typ->value.ptr;
 225                 if (!*pval)
 226                         return;
 227                 }
 228         else if (it->itype == ASN1_ITYPE_MSTRING)
 229                 {
 230                 utype = -1;
 231                 if (!*pval)
 232                         return;
 233                 }
 234         else
 235                 {
 236                 utype = it->utype;
 237                 if ((utype != V_ASN1_BOOLEAN) && !*pval)
 238                         return;
 239                 }
 240
 241         switch(utype)
 242                 {
 243                 case V_ASN1_OBJECT:
 244                 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
 245                 break;
 246
 247                 case V_ASN1_BOOLEAN:
 248                 if (it)
 249                         *(ASN1_BOOLEAN *)pval = it->size;
 250                 else
 251                         *(ASN1_BOOLEAN *)pval = -1;
 252                 return;
 253
 254                 case V_ASN1_NULL:
 255                 break;
 256
 257                 case V_ASN1_ANY:
 258                 ASN1_primitive_free(pval, NULL);
 259                 OPENSSL_free(*pval);
 260                 break;
 261
 262                 default:
 263                 ASN1_STRING_free((ASN1_STRING *)*pval);
 264                 *pval = NULL;
 265                 break;
 266                 }
 267         *pval = NULL;
 268         }