1 /* $OpenBSD: tasn_fre.c,v 1.23 2023/07/28 10:00:10 tb 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 #include "asn1_local.h" 66 67 static void asn1_item_free(ASN1_VALUE **pval, const ASN1_ITEM *it); 68 69 /* Free up an ASN1 structure */ 70 71 void 72 ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it) 73 { 74 asn1_item_free(&val, it); 75 } 76 LCRYPTO_ALIAS(ASN1_item_free); 77 78 void 79 ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 80 { 81 asn1_item_free(pval, it); 82 } 83 LCRYPTO_ALIAS(ASN1_item_ex_free); 84 85 static void 86 asn1_item_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 87 { 88 const ASN1_TEMPLATE *tt = NULL, *seqtt; 89 const ASN1_EXTERN_FUNCS *ef; 90 const ASN1_AUX *aux = it->funcs; 91 ASN1_aux_cb *asn1_cb = NULL; 92 int i; 93 94 if (pval == NULL) 95 return; 96 /* For primitive types *pval may be something other than C pointer. */ 97 if (it->itype != ASN1_ITYPE_PRIMITIVE && *pval == NULL) 98 return; 99 100 if (aux != NULL && aux->asn1_cb != NULL) 101 asn1_cb = aux->asn1_cb; 102 103 switch (it->itype) { 104 case ASN1_ITYPE_PRIMITIVE: 105 if (it->templates) 106 ASN1_template_free(pval, it->templates); 107 else 108 ASN1_primitive_free(pval, it); 109 break; 110 111 case ASN1_ITYPE_MSTRING: 112 ASN1_primitive_free(pval, it); 113 break; 114 115 case ASN1_ITYPE_CHOICE: 116 if (asn1_cb) { 117 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); 118 if (i == 2) 119 return; 120 } 121 i = asn1_get_choice_selector(pval, it); 122 if ((i >= 0) && (i < it->tcount)) { 123 ASN1_VALUE **pchval; 124 tt = it->templates + i; 125 pchval = asn1_get_field_ptr(pval, tt); 126 ASN1_template_free(pchval, tt); 127 } 128 if (asn1_cb) 129 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); 130 free(*pval); 131 *pval = NULL; 132 break; 133 134 case ASN1_ITYPE_EXTERN: 135 ef = it->funcs; 136 if (ef && ef->asn1_ex_free) 137 ef->asn1_ex_free(pval, it); 138 break; 139 140 case ASN1_ITYPE_NDEF_SEQUENCE: 141 case ASN1_ITYPE_SEQUENCE: 142 if (asn1_do_lock(pval, -1, it) > 0) 143 return; 144 if (asn1_cb) { 145 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); 146 if (i == 2) 147 return; 148 } 149 asn1_enc_cleanup(pval, it); 150 /* If we free up as normal we will invalidate any 151 * ANY DEFINED BY field and we wont be able to 152 * determine the type of the field it defines. So 153 * free up in reverse order. 154 */ 155 tt = it->templates + it->tcount - 1; 156 for (i = 0; i < it->tcount; tt--, i++) { 157 ASN1_VALUE **pseqval; 158 seqtt = asn1_do_adb(pval, tt, 0); 159 if (!seqtt) 160 continue; 161 pseqval = asn1_get_field_ptr(pval, seqtt); 162 ASN1_template_free(pseqval, seqtt); 163 } 164 if (asn1_cb) 165 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); 166 free(*pval); 167 *pval = NULL; 168 break; 169 } 170 } 171 172 void 173 ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) 174 { 175 int i; 176 if (tt->flags & ASN1_TFLG_SK_MASK) { 177 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval; 178 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) { 179 ASN1_VALUE *vtmp; 180 vtmp = sk_ASN1_VALUE_value(sk, i); 181 asn1_item_free(&vtmp, tt->item); 182 } 183 sk_ASN1_VALUE_free(sk); 184 *pval = NULL; 185 } else 186 asn1_item_free(pval, tt->item); 187 } 188 189 void 190 ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 191 { 192 int utype; 193 194 if (it != NULL && it->funcs != NULL) { 195 const ASN1_PRIMITIVE_FUNCS *pf = it->funcs; 196 197 pf->prim_free(pval, it); 198 return; 199 } 200 201 /* Special case: if 'it' is NULL free contents of ASN1_TYPE */ 202 if (!it) { 203 ASN1_TYPE *typ = (ASN1_TYPE *)*pval; 204 utype = typ->type; 205 pval = &typ->value.asn1_value; 206 if (!*pval) 207 return; 208 } else if (it->itype == ASN1_ITYPE_MSTRING) { 209 utype = -1; 210 if (!*pval) 211 return; 212 } else { 213 utype = it->utype; 214 if ((utype != V_ASN1_BOOLEAN) && !*pval) 215 return; 216 } 217 218 switch (utype) { 219 case V_ASN1_OBJECT: 220 ASN1_OBJECT_free((ASN1_OBJECT *)*pval); 221 break; 222 223 case V_ASN1_BOOLEAN: 224 if (it) 225 *(ASN1_BOOLEAN *)pval = it->size; 226 else 227 *(ASN1_BOOLEAN *)pval = -1; 228 return; 229 230 case V_ASN1_NULL: 231 break; 232 233 case V_ASN1_ANY: 234 ASN1_primitive_free(pval, NULL); 235 free(*pval); 236 break; 237 238 default: 239 ASN1_STRING_free((ASN1_STRING *)*pval); 240 break; 241 } 242 *pval = NULL; 243 } 244