lib/libcrypto/asn1/tasn_fre.c

   1 /* $OpenBSD: tasn_fre.c,v 1.16 2018/04/06 12:16:06 bluhm 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)
  92                 return;
  93         /* For primitive types *pval may be something other than C pointer. */
  94         if (it->itype != ASN1_ITYPE_PRIMITIVE && *pval == NULL)
  95                 return;
  96
  97         if (aux != NULL && aux->asn1_cb != NULL)
  98                 asn1_cb = aux->asn1_cb;
  99
 100         switch (it->itype) {
 101         case ASN1_ITYPE_PRIMITIVE:
 102                 if (it->templates)
 103                         ASN1_template_free(pval, it->templates);
 104                 else
 105                         ASN1_primitive_free(pval, it);
 106                 break;
 107
 108         case ASN1_ITYPE_MSTRING:
 109                 ASN1_primitive_free(pval, it);
 110                 break;
 111
 112         case ASN1_ITYPE_CHOICE:
 113                 if (asn1_cb) {
 114                         i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
 115                         if (i == 2)
 116                                 return;
 117                 }
 118                 i = asn1_get_choice_selector(pval, it);
 119                 if ((i >= 0) && (i < it->tcount)) {
 120                         ASN1_VALUE **pchval;
 121                         tt = it->templates + i;
 122                         pchval = asn1_get_field_ptr(pval, tt);
 123                         ASN1_template_free(pchval, tt);
 124                 }
 125                 if (asn1_cb)
 126                         asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
 127                 if (!combine) {
 128                         free(*pval);
 129                         *pval = NULL;
 130                 }
 131                 break;
 132
 133         case ASN1_ITYPE_EXTERN:
 134                 ef = it->funcs;
 135                 if (ef && ef->asn1_ex_free)
 136                         ef->asn1_ex_free(pval, it);
 137                 break;
 138
 139         case ASN1_ITYPE_NDEF_SEQUENCE:
 140         case ASN1_ITYPE_SEQUENCE:
 141                 if (asn1_do_lock(pval, -1, it) > 0)
 142                         return;
 143                 if (asn1_cb) {
 144                         i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
 145                         if (i == 2)
 146                                 return;
 147                 }
 148                 asn1_enc_free(pval, it);
 149                 /* If we free up as normal we will invalidate any
 150                  * ANY DEFINED BY field and we wont be able to
 151                  * determine the type of the field it defines. So
 152                  * free up in reverse order.
 153                  */
 154                 tt = it->templates + it->tcount - 1;
 155                 for (i = 0; i < it->tcount; tt--, i++) {
 156                         ASN1_VALUE **pseqval;
 157                         seqtt = asn1_do_adb(pval, tt, 0);
 158                         if (!seqtt)
 159                                 continue;
 160                         pseqval = asn1_get_field_ptr(pval, seqtt);
 161                         ASN1_template_free(pseqval, seqtt);
 162                 }
 163                 if (asn1_cb)
 164                         asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
 165                 if (!combine) {
 166                         free(*pval);
 167                         *pval = NULL;
 168                 }
 169                 break;
 170         }
 171 }
 172
 173 void
 174 ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 175 {
 176         int i;
 177         if (tt->flags & ASN1_TFLG_SK_MASK) {
 178                 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
 179                 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
 180                         ASN1_VALUE *vtmp;
 181                         vtmp = sk_ASN1_VALUE_value(sk, i);
 182                         asn1_item_combine_free(&vtmp, tt->item,
 183                             0);
 184                 }
 185                 sk_ASN1_VALUE_free(sk);
 186                 *pval = NULL;
 187         } else
 188                 asn1_item_combine_free(pval, tt->item,
 189                     tt->flags & ASN1_TFLG_COMBINE);
 190 }
 191
 192 void
 193 ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
 194 {
 195         int utype;
 196         if (it) {
 197                 const ASN1_PRIMITIVE_FUNCS *pf;
 198                 pf = it->funcs;
 199                 if (pf && pf->prim_free) {
 200                         pf->prim_free(pval, it);
 201                         return;
 202                 }
 203         }
 204         /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
 205         if (!it) {
 206                 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
 207                 utype = typ->type;
 208                 pval = &typ->value.asn1_value;
 209                 if (!*pval)
 210                         return;
 211         } else if (it->itype == ASN1_ITYPE_MSTRING) {
 212                 utype = -1;
 213                 if (!*pval)
 214                         return;
 215         } else {
 216                 utype = it->utype;
 217                 if ((utype != V_ASN1_BOOLEAN) && !*pval)
 218                         return;
 219         }
 220
 221         switch (utype) {
 222         case V_ASN1_OBJECT:
 223                 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
 224                 break;
 225
 226         case V_ASN1_BOOLEAN:
 227                 if (it)
 228                         *(ASN1_BOOLEAN *)pval = it->size;
 229                 else
 230                         *(ASN1_BOOLEAN *)pval = -1;
 231                 return;
 232
 233         case V_ASN1_NULL:
 234                 break;
 235
 236         case V_ASN1_ANY:
 237                 ASN1_primitive_free(pval, NULL);
 238                 free(*pval);
 239                 break;
 240
 241         default:
 242                 ASN1_STRING_free((ASN1_STRING *)*pval);
 243                 break;
 244         }
 245         *pval = NULL;
 246 }