1 /* $OpenBSD: tasn_fre.c,v 1.20 2022/05/12 19:55:58 jsing 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_locl.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 77 void 78 ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 79 { 80 asn1_item_free(pval, it); 81 } 82 83 static void 84 asn1_item_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 85 { 86 const ASN1_TEMPLATE *tt = NULL, *seqtt; 87 const ASN1_EXTERN_FUNCS *ef; 88 const ASN1_AUX *aux = it->funcs; 89 ASN1_aux_cb *asn1_cb = NULL; 90 int i; 91 92 if (pval == NULL) 93 return; 94 /* For primitive types *pval may be something other than C pointer. */ 95 if (it->itype != ASN1_ITYPE_PRIMITIVE && *pval == NULL) 96 return; 97 98 if (aux != NULL && aux->asn1_cb != NULL) 99 asn1_cb = aux->asn1_cb; 100 101 switch (it->itype) { 102 case ASN1_ITYPE_PRIMITIVE: 103 if (it->templates) 104 ASN1_template_free(pval, it->templates); 105 else 106 ASN1_primitive_free(pval, it); 107 break; 108 109 case ASN1_ITYPE_MSTRING: 110 ASN1_primitive_free(pval, it); 111 break; 112 113 case ASN1_ITYPE_CHOICE: 114 if (asn1_cb) { 115 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); 116 if (i == 2) 117 return; 118 } 119 i = asn1_get_choice_selector(pval, it); 120 if ((i >= 0) && (i < it->tcount)) { 121 ASN1_VALUE **pchval; 122 tt = it->templates + i; 123 pchval = asn1_get_field_ptr(pval, tt); 124 ASN1_template_free(pchval, tt); 125 } 126 if (asn1_cb) 127 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); 128 free(*pval); 129 *pval = NULL; 130 break; 131 132 case ASN1_ITYPE_EXTERN: 133 ef = it->funcs; 134 if (ef && ef->asn1_ex_free) 135 ef->asn1_ex_free(pval, it); 136 break; 137 138 case ASN1_ITYPE_NDEF_SEQUENCE: 139 case ASN1_ITYPE_SEQUENCE: 140 if (asn1_do_lock(pval, -1, it) > 0) 141 return; 142 if (asn1_cb) { 143 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); 144 if (i == 2) 145 return; 146 } 147 asn1_enc_cleanup(pval, it); 148 /* If we free up as normal we will invalidate any 149 * ANY DEFINED BY field and we wont be able to 150 * determine the type of the field it defines. So 151 * free up in reverse order. 152 */ 153 tt = it->templates + it->tcount - 1; 154 for (i = 0; i < it->tcount; tt--, i++) { 155 ASN1_VALUE **pseqval; 156 seqtt = asn1_do_adb(pval, tt, 0); 157 if (!seqtt) 158 continue; 159 pseqval = asn1_get_field_ptr(pval, seqtt); 160 ASN1_template_free(pseqval, seqtt); 161 } 162 if (asn1_cb) 163 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); 164 free(*pval); 165 *pval = NULL; 166 break; 167 } 168 } 169 170 void 171 ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) 172 { 173 int i; 174 if (tt->flags & ASN1_TFLG_SK_MASK) { 175 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval; 176 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) { 177 ASN1_VALUE *vtmp; 178 vtmp = sk_ASN1_VALUE_value(sk, i); 179 asn1_item_free(&vtmp, tt->item); 180 } 181 sk_ASN1_VALUE_free(sk); 182 *pval = NULL; 183 } else 184 asn1_item_free(pval, tt->item); 185 } 186 187 void 188 ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 189 { 190 int utype; 191 192 if (it != NULL && it->funcs != NULL) { 193 const ASN1_PRIMITIVE_FUNCS *pf = it->funcs; 194 195 pf->prim_free(pval, it); 196 return; 197 } 198 199 /* Special case: if 'it' is NULL free contents of ASN1_TYPE */ 200 if (!it) { 201 ASN1_TYPE *typ = (ASN1_TYPE *)*pval; 202 utype = typ->type; 203 pval = &typ->value.asn1_value; 204 if (!*pval) 205 return; 206 } else if (it->itype == ASN1_ITYPE_MSTRING) { 207 utype = -1; 208 if (!*pval) 209 return; 210 } else { 211 utype = it->utype; 212 if ((utype != V_ASN1_BOOLEAN) && !*pval) 213 return; 214 } 215 216 switch (utype) { 217 case V_ASN1_OBJECT: 218 ASN1_OBJECT_free((ASN1_OBJECT *)*pval); 219 break; 220 221 case V_ASN1_BOOLEAN: 222 if (it) 223 *(ASN1_BOOLEAN *)pval = it->size; 224 else 225 *(ASN1_BOOLEAN *)pval = -1; 226 return; 227 228 case V_ASN1_NULL: 229 break; 230 231 case V_ASN1_ANY: 232 ASN1_primitive_free(pval, NULL); 233 free(*pval); 234 break; 235 236 default: 237 ASN1_STRING_free((ASN1_STRING *)*pval); 238 break; 239 } 240 *pval = NULL; 241 } 242