crypto/asn1/tasn_fre.c

   1 /* tasn_fre.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 2000.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  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 ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
  71 {
  72     asn1_item_combine_free(&val, it, 0);
  73 }
  74
  75 void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
  76 {
  77     asn1_item_combine_free(pval, it, 0);
  78 }
  79
  80 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it,
  81                                    int combine)
  82 {
  83     const ASN1_TEMPLATE *tt = NULL, *seqtt;
  84     const ASN1_EXTERN_FUNCS *ef;
  85     const ASN1_COMPAT_FUNCS *cf;
  86     const ASN1_AUX *aux = it->funcs;
  87     ASN1_aux_cb *asn1_cb;
  88     int i;
  89     if (!pval)
  90         return;
  91     if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
  92         return;
  93     if (aux && aux->asn1_cb)
  94         asn1_cb = aux->asn1_cb;
  95     else
  96         asn1_cb = 0;
  97
  98     switch (it->itype) {
  99
 100     case ASN1_ITYPE_PRIMITIVE:
 101         if (it->templates)
 102             ASN1_template_free(pval, it->templates);
 103         else
 104             ASN1_primitive_free(pval, it);
 105         break;
 106
 107     case ASN1_ITYPE_MSTRING:
 108         ASN1_primitive_free(pval, it);
 109         break;
 110
 111     case ASN1_ITYPE_CHOICE:
 112         if (asn1_cb) {
 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 ((i >= 0) && (i < it->tcount)) {
 119             ASN1_VALUE **pchval;
 120             tt = it->templates + i;
 121             pchval = asn1_get_field_ptr(pval, tt);
 122             ASN1_template_free(pchval, tt);
 123         }
 124         if (asn1_cb)
 125             asn1_cb(ASN1_OP_FREE_POST, pval, it);
 126         if (!combine) {
 127             OPENSSL_free(*pval);
 128             *pval = NULL;
 129         }
 130         break;
 131
 132     case ASN1_ITYPE_COMPAT:
 133         cf = it->funcs;
 134         if (cf && cf->asn1_free)
 135             cf->asn1_free(*pval);
 136         break;
 137
 138     case ASN1_ITYPE_EXTERN:
 139         ef = it->funcs;
 140         if (ef && ef->asn1_ex_free)
 141             ef->asn1_ex_free(pval, it);
 142         break;
 143
 144     case ASN1_ITYPE_NDEF_SEQUENCE:
 145     case ASN1_ITYPE_SEQUENCE:
 146         if (asn1_do_lock(pval, -1, it) > 0)
 147             return;
 148         if (asn1_cb) {
 149             i = asn1_cb(ASN1_OP_FREE_PRE, pval, it);
 150             if (i == 2)
 151                 return;
 152         }
 153         asn1_enc_free(pval, it);
 154         /*
 155          * If we free up as normal we will invalidate any ANY DEFINED BY
 156          * field and we wont be able to determine the type of the field it
 157          * defines. So free up in reverse order.
 158          */
 159         tt = it->templates + it->tcount - 1;
 160         for (i = 0; i < it->tcount; tt--, i++) {
 161             ASN1_VALUE **pseqval;
 162             seqtt = asn1_do_adb(pval, tt, 0);
 163             if (!seqtt)
 164                 continue;
 165             pseqval = asn1_get_field_ptr(pval, seqtt);
 166             ASN1_template_free(pseqval, seqtt);
 167         }
 168         if (asn1_cb)
 169             asn1_cb(ASN1_OP_FREE_POST, pval, it);
 170         if (!combine) {
 171             OPENSSL_free(*pval);
 172             *pval = NULL;
 173         }
 174         break;
 175     }
 176 }
 177
 178 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 179 {
 180     int i;
 181     if (tt->flags & ASN1_TFLG_SK_MASK) {
 182         STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
 183         for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
 184             ASN1_VALUE *vtmp;
 185             vtmp = sk_ASN1_VALUE_value(sk, i);
 186             asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), 0);
 187         }
 188         sk_ASN1_VALUE_free(sk);
 189         *pval = NULL;
 190     } else
 191         asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item),
 192                                tt->flags & ASN1_TFLG_COMBINE);
 193 }
 194
 195 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
 196 {
 197     int utype;
 198     if (it) {
 199         const ASN1_PRIMITIVE_FUNCS *pf;
 200         pf = it->funcs;
 201         if (pf && pf->prim_free) {
 202             pf->prim_free(pval, it);
 203             return;
 204         }
 205     }
 206     /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
 207     if (!it) {
 208         ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
 209         utype = typ->type;
 210         pval = &typ->value.asn1_value;
 211         if (!*pval)
 212             return;
 213     } else if (it->itype == ASN1_ITYPE_MSTRING) {
 214         utype = -1;
 215         if (!*pval)
 216             return;
 217     } else {
 218         utype = it->utype;
 219         if ((utype != V_ASN1_BOOLEAN) && !*pval)
 220             return;
 221     }
 222
 223     switch (utype) {
 224     case V_ASN1_OBJECT:
 225         ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
 226         break;
 227
 228     case V_ASN1_BOOLEAN:
 229         if (it)
 230             *(ASN1_BOOLEAN *)pval = it->size;
 231         else
 232             *(ASN1_BOOLEAN *)pval = -1;
 233         return;
 234
 235     case V_ASN1_NULL:
 236         break;
 237
 238     case V_ASN1_ANY:
 239         ASN1_primitive_free(pval, NULL);
 240         OPENSSL_free(*pval);
 241         break;
 242
 243     default:
 244         ASN1_STRING_free((ASN1_STRING *)*pval);
 245         *pval = NULL;
 246         break;
 247     }
 248     *pval = NULL;
 249 }