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) return;
  88         if((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) return;
  89         if(aux && aux->asn1_cb) asn1_cb = aux->asn1_cb;
  90         else asn1_cb = 0;
  91
  92         switch(it->itype) {
  93
  94                 case ASN1_ITYPE_PRIMITIVE:
  95                 if(it->templates) ASN1_template_free(pval, it->templates);
  96                 else ASN1_primitive_free(pval, it);
  97                 break;
  98
  99                 case ASN1_ITYPE_MSTRING:
 100                 ASN1_primitive_free(pval, it);
 101                 break;
 102
 103                 case ASN1_ITYPE_CHOICE:
 104                 if(asn1_cb) {
 105                         i = asn1_cb(ASN1_OP_FREE_PRE, pval, it);
 106                         if(i == 2) return;
 107                 }
 108                 i = asn1_get_choice_selector(pval, it);
 109                 if(asn1_cb) asn1_cb(ASN1_OP_FREE_PRE, pval, it);
 110                 if((i >= 0) && (i < it->tcount)) {
 111                         ASN1_VALUE **pchval;
 112                         tt = it->templates + i;
 113                         pchval = asn1_get_field_ptr(pval, tt);
 114                         ASN1_template_free(pchval, tt);
 115                 }
 116                 if(asn1_cb) asn1_cb(ASN1_OP_FREE_POST, pval, it);
 117                 if(!combine) {
 118                         OPENSSL_free(*pval);
 119                         *pval = NULL;
 120                 }
 121                 break;
 122
 123                 case ASN1_ITYPE_COMPAT:
 124                 cf = it->funcs;
 125                 if(cf && cf->asn1_free) cf->asn1_free(*pval);
 126                 break;
 127
 128                 case ASN1_ITYPE_EXTERN:
 129                 ef = it->funcs;
 130                 if(ef && ef->asn1_ex_free) ef->asn1_ex_free(pval, it);
 131                 break;
 132
 133                 case ASN1_ITYPE_NDEF_SEQUENCE:
 134                 case ASN1_ITYPE_SEQUENCE:
 135                 if(asn1_do_lock(pval, -1, it) > 0) return;
 136                 if(asn1_cb) {
 137                         i = asn1_cb(ASN1_OP_FREE_PRE, pval, it);
 138                         if(i == 2) return;
 139                 }
 140                 asn1_enc_free(pval, it);
 141                 /* If we free up as normal we will invalidate any
 142                  * ANY DEFINED BY field and we wont be able to
 143                  * determine the type of the field it defines. So
 144                  * free up in reverse order.
 145                  */
 146                 tt = it->templates + it->tcount - 1;
 147                 for(i = 0; i < it->tcount; tt--, i++) {
 148                         ASN1_VALUE **pseqval;
 149                         seqtt = asn1_do_adb(pval, tt, 0);
 150                         if(!seqtt) continue;
 151                         pseqval = asn1_get_field_ptr(pval, seqtt);
 152                         ASN1_template_free(pseqval, seqtt);
 153                 }
 154                 if(asn1_cb) asn1_cb(ASN1_OP_FREE_POST, pval, it);
 155                 if(!combine) {
 156                         OPENSSL_free(*pval);
 157                         *pval = NULL;
 158                 }
 159                 break;
 160         }
 161 }
 162
 163 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 164 {
 165         int i;
 166         if(tt->flags & ASN1_TFLG_SK_MASK) {
 167                 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
 168                 for(i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
 169                         ASN1_VALUE *vtmp;
 170                         vtmp = sk_ASN1_VALUE_value(sk, i);
 171                         asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), 0);
 172                 }
 173                 sk_ASN1_VALUE_free(sk);
 174                 *pval = NULL;
 175         } else asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item),
 176                                                 tt->flags & ASN1_TFLG_COMBINE);
 177 }
 178
 179 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
 180 {
 181         int utype;
 182         if(it) {
 183                 const ASN1_PRIMITIVE_FUNCS *pf;
 184                 pf = it->funcs;
 185                 if(pf && pf->prim_free) {
 186                         pf->prim_free(pval, it);
 187                         return;
 188                 }
 189         }
 190         /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
 191         if(!it) {
 192                 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
 193                 utype = typ->type;
 194                 pval = (ASN1_VALUE **)&typ->value.ptr;
 195                 if(!*pval) return;
 196         } else if(it->itype == ASN1_ITYPE_MSTRING) {
 197                 utype = -1;
 198                 if(!*pval) return;
 199         } else {
 200                 utype = it->utype;
 201                 if((utype != V_ASN1_BOOLEAN) && !*pval) return;
 202         }
 203
 204         switch(utype) {
 205                 case V_ASN1_OBJECT:
 206                 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
 207                 break;
 208
 209                 case V_ASN1_BOOLEAN:
 210                 if (it)
 211                         *(ASN1_BOOLEAN *)pval = it->size;
 212                 else
 213                         *(ASN1_BOOLEAN *)pval = -1;
 214                 return;
 215
 216                 case V_ASN1_NULL:
 217                 break;
 218
 219                 case V_ASN1_ANY:
 220                 ASN1_primitive_free(pval, NULL);
 221                 OPENSSL_free(*pval);
 222                 break;
 223
 224                 default:
 225                 ASN1_STRING_free((ASN1_STRING *)*pval);
 226                 *pval = NULL;
 227                 break;
 228         }
 229         *pval = NULL;
 230 }