1 /* $OpenBSD: tasn_fre.c,v 1.18 2022/01/07 12:24:17 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_locl.h" 66 67 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, 68 int combine); 69 70 /* Free up an ASN1 structure */ 71 72 void 73 ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it) 74 { 75 asn1_item_combine_free(&val, it, 0); 76 } 77 78 void 79 ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 80 { 81 asn1_item_combine_free(pval, it, 0); 82 } 83 84 static void 85 asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine) 86 { 87 const ASN1_TEMPLATE *tt = NULL, *seqtt; 88 const ASN1_EXTERN_FUNCS *ef; 89 const ASN1_AUX *aux = it->funcs; 90 ASN1_aux_cb *asn1_cb = NULL; 91 int i; 92 93 if (pval == NULL) 94 return; 95 /* For primitive types *pval may be something other than C pointer. */ 96 if (it->itype != ASN1_ITYPE_PRIMITIVE && *pval == NULL) 97 return; 98 99 if (aux != NULL && aux->asn1_cb != NULL) 100 asn1_cb = aux->asn1_cb; 101 102 switch (it->itype) { 103 case ASN1_ITYPE_PRIMITIVE: 104 if (it->templates) 105 ASN1_template_free(pval, it->templates); 106 else 107 ASN1_primitive_free(pval, it); 108 break; 109 110 case ASN1_ITYPE_MSTRING: 111 ASN1_primitive_free(pval, it); 112 break; 113 114 case ASN1_ITYPE_CHOICE: 115 if (asn1_cb) { 116 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); 117 if (i == 2) 118 return; 119 } 120 i = asn1_get_choice_selector(pval, it); 121 if ((i >= 0) && (i < it->tcount)) { 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, NULL); 129 if (!combine) { 130 free(*pval); 131 *pval = NULL; 132 } 133 break; 134 135 case ASN1_ITYPE_EXTERN: 136 ef = it->funcs; 137 if (ef && ef->asn1_ex_free) 138 ef->asn1_ex_free(pval, it); 139 break; 140 141 case ASN1_ITYPE_NDEF_SEQUENCE: 142 case ASN1_ITYPE_SEQUENCE: 143 if (asn1_do_lock(pval, -1, it) > 0) 144 return; 145 if (asn1_cb) { 146 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); 147 if (i == 2) 148 return; 149 } 150 asn1_enc_free(pval, it); 151 /* If we free up as normal we will invalidate any 152 * ANY DEFINED BY field and we wont be able to 153 * determine the type of the field it defines. So 154 * free up in reverse order. 155 */ 156 tt = it->templates + it->tcount - 1; 157 for (i = 0; i < it->tcount; tt--, i++) { 158 ASN1_VALUE **pseqval; 159 seqtt = asn1_do_adb(pval, tt, 0); 160 if (!seqtt) 161 continue; 162 pseqval = asn1_get_field_ptr(pval, seqtt); 163 ASN1_template_free(pseqval, seqtt); 164 } 165 if (asn1_cb) 166 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); 167 if (!combine) { 168 free(*pval); 169 *pval = NULL; 170 } 171 break; 172 } 173 } 174 175 void 176 ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) 177 { 178 int i; 179 if (tt->flags & ASN1_TFLG_SK_MASK) { 180 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval; 181 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) { 182 ASN1_VALUE *vtmp; 183 vtmp = sk_ASN1_VALUE_value(sk, i); 184 asn1_item_combine_free(&vtmp, tt->item, 185 0); 186 } 187 sk_ASN1_VALUE_free(sk); 188 *pval = NULL; 189 } else 190 asn1_item_combine_free(pval, tt->item, 191 tt->flags & ASN1_TFLG_COMBINE); 192 } 193 194 void 195 ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 196 { 197 int utype; 198 199 if (it != NULL && it->funcs != NULL) { 200 const ASN1_PRIMITIVE_FUNCS *pf = it->funcs; 201 202 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 free(*pval); 241 break; 242 243 default: 244 ASN1_STRING_free((ASN1_STRING *)*pval); 245 break; 246 } 247 *pval = NULL; 248 } 249