tasn_fre.c revision 296341
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 65static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, 66 int combine); 67 68/* Free up an ASN1 structure */ 69 70void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it) 71{ 72 asn1_item_combine_free(&val, it, 0); 73} 74 75void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 76{ 77 asn1_item_combine_free(pval, it, 0); 78} 79 80static 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, NULL); 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, NULL); 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, NULL); 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, NULL); 170 if (!combine) { 171 OPENSSL_free(*pval); 172 *pval = NULL; 173 } 174 break; 175 } 176} 177 178void 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 195void 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} 250