crypto/libressl/crypto/asn1/tasn_fre.c

   1 /* $OpenBSD: tasn_fre.c,v 1.13 2015/02/14 13:32:46 jsing Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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,
  66     int combine);
  67
  68 /* Free up an ASN1 structure */
  69
  70 void
  71 ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
  72 {
  73         asn1_item_combine_free(&val, it, 0);
  74 }
  75
  76 void
  77 ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
  78 {
  79         asn1_item_combine_free(pval, it, 0);
  80 }
  81
  82 static void
  83 asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine)
  84 {
  85         const ASN1_TEMPLATE *tt = NULL, *seqtt;
  86         const ASN1_EXTERN_FUNCS *ef;
  87         const ASN1_AUX *aux = it->funcs;
  88         ASN1_aux_cb *asn1_cb = NULL;
  89         int i;
  90
  91         if (pval == NULL || *pval == NULL)
  92                 return;
  93
  94         if (aux != NULL && aux->asn1_cb != NULL)
  95                 asn1_cb = aux->asn1_cb;
  96
  97         switch (it->itype) {
  98         case ASN1_ITYPE_PRIMITIVE:
  99                 if (it->templates)
 100                         ASN1_template_free(pval, it->templates);
 101                 else
 102                         ASN1_primitive_free(pval, it);
 103                 break;
 104
 105         case ASN1_ITYPE_MSTRING:
 106                 ASN1_primitive_free(pval, it);
 107                 break;
 108
 109         case ASN1_ITYPE_CHOICE:
 110                 if (asn1_cb) {
 111                         i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
 112                         if (i == 2)
 113                                 return;
 114                 }
 115                 i = asn1_get_choice_selector(pval, it);
 116                 if ((i >= 0) && (i < it->tcount)) {
 117                         ASN1_VALUE **pchval;
 118                         tt = it->templates + i;
 119                         pchval = asn1_get_field_ptr(pval, tt);
 120                         ASN1_template_free(pchval, tt);
 121                 }
 122                 if (asn1_cb)
 123                         asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
 124                 if (!combine) {
 125                         free(*pval);
 126                         *pval = NULL;
 127                 }
 128                 break;
 129
 130         case ASN1_ITYPE_EXTERN:
 131                 ef = it->funcs;
 132                 if (ef && ef->asn1_ex_free)
 133                         ef->asn1_ex_free(pval, it);
 134                 break;
 135
 136         case ASN1_ITYPE_NDEF_SEQUENCE:
 137         case ASN1_ITYPE_SEQUENCE:
 138                 if (asn1_do_lock(pval, -1, it) > 0)
 139                         return;
 140                 if (asn1_cb) {
 141                         i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
 142                         if (i == 2)
 143                                 return;
 144                 }
 145                 asn1_enc_free(pval, it);
 146                 /* If we free up as normal we will invalidate any
 147                  * ANY DEFINED BY field and we wont be able to
 148                  * determine the type of the field it defines. So
 149                  * free up in reverse order.
 150                  */
 151                 tt = it->templates + it->tcount - 1;
 152                 for (i = 0; i < it->tcount; tt--, i++) {
 153                         ASN1_VALUE **pseqval;
 154                         seqtt = asn1_do_adb(pval, tt, 0);
 155                         if (!seqtt)
 156                                 continue;
 157                         pseqval = asn1_get_field_ptr(pval, seqtt);
 158                         ASN1_template_free(pseqval, seqtt);
 159                 }
 160                 if (asn1_cb)
 161                         asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
 162                 if (!combine) {
 163                         free(*pval);
 164                         *pval = NULL;
 165                 }
 166                 break;
 167         }
 168 }
 169
 170 void
 171 ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 172 {
 173         int i;
 174         if (tt->flags & ASN1_TFLG_SK_MASK) {
 175                 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
 176                 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
 177                         ASN1_VALUE *vtmp;
 178                         vtmp = sk_ASN1_VALUE_value(sk, i);
 179                         asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item),
 180                             0);
 181                 }
 182                 sk_ASN1_VALUE_free(sk);
 183                 *pval = NULL;
 184         } else
 185                 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item),
 186                     tt->flags & ASN1_TFLG_COMBINE);
 187 }
 188
 189 void
 190 ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
 191 {
 192         int utype;
 193         if (it) {
 194                 const ASN1_PRIMITIVE_FUNCS *pf;
 195                 pf = it->funcs;
 196                 if (pf && pf->prim_free) {
 197                         pf->prim_free(pval, it);
 198                         return;
 199                 }
 200         }
 201         /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
 202         if (!it) {
 203                 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
 204                 utype = typ->type;
 205                 pval = &typ->value.asn1_value;
 206                 if (!*pval)
 207                         return;
 208         } else if (it->itype == ASN1_ITYPE_MSTRING) {
 209                 utype = -1;
 210                 if (!*pval)
 211                         return;
 212         } else {
 213                 utype = it->utype;
 214                 if ((utype != V_ASN1_BOOLEAN) && !*pval)
 215                         return;
 216         }
 217
 218         switch (utype) {
 219         case V_ASN1_OBJECT:
 220                 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
 221                 break;
 222
 223         case V_ASN1_BOOLEAN:
 224                 if (it)
 225                         *(ASN1_BOOLEAN *)pval = it->size;
 226                 else
 227                         *(ASN1_BOOLEAN *)pval = -1;
 228                 return;
 229
 230         case V_ASN1_NULL:
 231                 break;
 232
 233         case V_ASN1_ANY:
 234                 ASN1_primitive_free(pval, NULL);
 235                 free(*pval);
 236                 break;
 237
 238         default:
 239                 ASN1_STRING_free((ASN1_STRING *)*pval);
 240                 break;
 241         }
 242         *pval = NULL;
 243 }