1 /* tasn_fre.c */ 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, int combine); 66 67 /* Free up an ASN1 structure */ 68 69 void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it) 70 { 71 asn1_item_combine_free(&val, it, 0); 72 } 73 74 void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 75 { 76 asn1_item_combine_free(pval, it, 0); 77 } 78 79 static 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 ((i >= 0) && (i < it->tcount)) 119 { 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); 127 if (!combine) 128 { 129 OPENSSL_free(*pval); 130 *pval = NULL; 131 } 132 break; 133 134 case ASN1_ITYPE_COMPAT: 135 cf = it->funcs; 136 if (cf && cf->asn1_free) 137 cf->asn1_free(*pval); 138 break; 139 140 case ASN1_ITYPE_EXTERN: 141 ef = it->funcs; 142 if (ef && ef->asn1_ex_free) 143 ef->asn1_ex_free(pval, it); 144 break; 145 146 case ASN1_ITYPE_NDEF_SEQUENCE: 147 case ASN1_ITYPE_SEQUENCE: 148 if (asn1_do_lock(pval, -1, it) > 0) 149 return; 150 if (asn1_cb) 151 { 152 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it); 153 if (i == 2) 154 return; 155 } 156 asn1_enc_free(pval, it); 157 /* If we free up as normal we will invalidate any 158 * ANY DEFINED BY field and we wont be able to 159 * determine the type of the field it defines. So 160 * free up in reverse order. 161 */ 162 tt = it->templates + it->tcount - 1; 163 for (i = 0; i < it->tcount; tt--, i++) 164 { 165 ASN1_VALUE **pseqval; 166 seqtt = asn1_do_adb(pval, tt, 0); 167 if (!seqtt) 168 continue; 169 pseqval = asn1_get_field_ptr(pval, seqtt); 170 ASN1_template_free(pseqval, seqtt); 171 } 172 if (asn1_cb) 173 asn1_cb(ASN1_OP_FREE_POST, pval, it); 174 if (!combine) 175 { 176 OPENSSL_free(*pval); 177 *pval = NULL; 178 } 179 break; 180 } 181 } 182 183 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) 184 { 185 int i; 186 if (tt->flags & ASN1_TFLG_SK_MASK) 187 { 188 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval; 189 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) 190 { 191 ASN1_VALUE *vtmp; 192 vtmp = sk_ASN1_VALUE_value(sk, i); 193 asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), 194 0); 195 } 196 sk_ASN1_VALUE_free(sk); 197 *pval = NULL; 198 } 199 else 200 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item), 201 tt->flags & ASN1_TFLG_COMBINE); 202 } 203 204 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 205 { 206 int utype; 207 if (it) 208 { 209 const ASN1_PRIMITIVE_FUNCS *pf; 210 pf = it->funcs; 211 if (pf && pf->prim_free) 212 { 213 pf->prim_free(pval, it); 214 return; 215 } 216 } 217 /* Special case: if 'it' is NULL free contents of ASN1_TYPE */ 218 if (!it) 219 { 220 ASN1_TYPE *typ = (ASN1_TYPE *)*pval; 221 utype = typ->type; 222 pval = &typ->value.asn1_value; 223 if (!*pval) 224 return; 225 } 226 else if (it->itype == ASN1_ITYPE_MSTRING) 227 { 228 utype = -1; 229 if (!*pval) 230 return; 231 } 232 else 233 { 234 utype = it->utype; 235 if ((utype != V_ASN1_BOOLEAN) && !*pval) 236 return; 237 } 238 239 switch(utype) 240 { 241 case V_ASN1_OBJECT: 242 ASN1_OBJECT_free((ASN1_OBJECT *)*pval); 243 break; 244 245 case V_ASN1_BOOLEAN: 246 if (it) 247 *(ASN1_BOOLEAN *)pval = it->size; 248 else 249 *(ASN1_BOOLEAN *)pval = -1; 250 return; 251 252 case V_ASN1_NULL: 253 break; 254 255 case V_ASN1_ANY: 256 ASN1_primitive_free(pval, NULL); 257 OPENSSL_free(*pval); 258 break; 259 260 default: 261 ASN1_STRING_free((ASN1_STRING *)*pval); 262 *pval = NULL; 263 break; 264 } 265 *pval = NULL; 266 } 267