tasn_fre.c revision 160814
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 65static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine); 66 67/* Free up an ASN1 structure */ 68 69void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it) 70 { 71 asn1_item_combine_free(&val, it, 0); 72 } 73 74void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 75 { 76 asn1_item_combine_free(pval, it, 0); 77 } 78 79static 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) 88 return; 89 if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) 90 return; 91 if (aux && aux->asn1_cb) 92 asn1_cb = aux->asn1_cb; 93 else 94 asn1_cb = 0; 95 96 switch(it->itype) 97 { 98 99 case ASN1_ITYPE_PRIMITIVE: 100 if (it->templates) 101 ASN1_template_free(pval, it->templates); 102 else 103 ASN1_primitive_free(pval, it); 104 break; 105 106 case ASN1_ITYPE_MSTRING: 107 ASN1_primitive_free(pval, it); 108 break; 109 110 case ASN1_ITYPE_CHOICE: 111 if (asn1_cb) 112 { 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 (asn1_cb) 119 asn1_cb(ASN1_OP_FREE_PRE, pval, it); 120 if ((i >= 0) && (i < it->tcount)) 121 { 122 ASN1_VALUE **pchval; 123 tt = it->templates + i; 124 pchval = asn1_get_field_ptr(pval, tt); 125 ASN1_template_free(pchval, tt); 126 } 127 if (asn1_cb) 128 asn1_cb(ASN1_OP_FREE_POST, pval, it); 129 if (!combine) 130 { 131 OPENSSL_free(*pval); 132 *pval = NULL; 133 } 134 break; 135 136 case ASN1_ITYPE_COMPAT: 137 cf = it->funcs; 138 if (cf && cf->asn1_free) 139 cf->asn1_free(*pval); 140 break; 141 142 case ASN1_ITYPE_EXTERN: 143 ef = it->funcs; 144 if (ef && ef->asn1_ex_free) 145 ef->asn1_ex_free(pval, it); 146 break; 147 148 case ASN1_ITYPE_NDEF_SEQUENCE: 149 case ASN1_ITYPE_SEQUENCE: 150 if (asn1_do_lock(pval, -1, it) > 0) 151 return; 152 if (asn1_cb) 153 { 154 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it); 155 if (i == 2) 156 return; 157 } 158 asn1_enc_free(pval, it); 159 /* If we free up as normal we will invalidate any 160 * ANY DEFINED BY field and we wont be able to 161 * determine the type of the field it defines. So 162 * free up in reverse order. 163 */ 164 tt = it->templates + it->tcount - 1; 165 for (i = 0; i < it->tcount; tt--, i++) 166 { 167 ASN1_VALUE **pseqval; 168 seqtt = asn1_do_adb(pval, tt, 0); 169 if (!seqtt) 170 continue; 171 pseqval = asn1_get_field_ptr(pval, seqtt); 172 ASN1_template_free(pseqval, seqtt); 173 } 174 if (asn1_cb) 175 asn1_cb(ASN1_OP_FREE_POST, pval, it); 176 if (!combine) 177 { 178 OPENSSL_free(*pval); 179 *pval = NULL; 180 } 181 break; 182 } 183 } 184 185void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) 186 { 187 int i; 188 if (tt->flags & ASN1_TFLG_SK_MASK) 189 { 190 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval; 191 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) 192 { 193 ASN1_VALUE *vtmp; 194 vtmp = sk_ASN1_VALUE_value(sk, i); 195 asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), 196 0); 197 } 198 sk_ASN1_VALUE_free(sk); 199 *pval = NULL; 200 } 201 else 202 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item), 203 tt->flags & ASN1_TFLG_COMBINE); 204 } 205 206void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 207 { 208 int utype; 209 if (it) 210 { 211 const ASN1_PRIMITIVE_FUNCS *pf; 212 pf = it->funcs; 213 if (pf && pf->prim_free) 214 { 215 pf->prim_free(pval, it); 216 return; 217 } 218 } 219 /* Special case: if 'it' is NULL free contents of ASN1_TYPE */ 220 if (!it) 221 { 222 ASN1_TYPE *typ = (ASN1_TYPE *)*pval; 223 utype = typ->type; 224 pval = (ASN1_VALUE **)&typ->value.ptr; 225 if (!*pval) 226 return; 227 } 228 else if (it->itype == ASN1_ITYPE_MSTRING) 229 { 230 utype = -1; 231 if (!*pval) 232 return; 233 } 234 else 235 { 236 utype = it->utype; 237 if ((utype != V_ASN1_BOOLEAN) && !*pval) 238 return; 239 } 240 241 switch(utype) 242 { 243 case V_ASN1_OBJECT: 244 ASN1_OBJECT_free((ASN1_OBJECT *)*pval); 245 break; 246 247 case V_ASN1_BOOLEAN: 248 if (it) 249 *(ASN1_BOOLEAN *)pval = it->size; 250 else 251 *(ASN1_BOOLEAN *)pval = -1; 252 return; 253 254 case V_ASN1_NULL: 255 break; 256 257 case V_ASN1_ANY: 258 ASN1_primitive_free(pval, NULL); 259 OPENSSL_free(*pval); 260 break; 261 262 default: 263 ASN1_STRING_free((ASN1_STRING *)*pval); 264 *pval = NULL; 265 break; 266 } 267 *pval = NULL; 268 } 269