1 /* $OpenBSD: tasn_fre.c,v 1.13 2015/02/14 13:32:46 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 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, 66 int combine); 67 68 /* Free up an ASN1 structure */ 69 70 void 71 ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it) 72 { 73 asn1_item_combine_free(&val, it, 0); 74 } 75 76 void 77 ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 78 { 79 asn1_item_combine_free(pval, it, 0); 80 } 81 82 static void 83 asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine) 84 { 85 const ASN1_TEMPLATE *tt = NULL, *seqtt; 86 const ASN1_EXTERN_FUNCS *ef; 87 const ASN1_AUX *aux = it->funcs; 88 ASN1_aux_cb *asn1_cb = NULL; 89 int i; 90 91 if (pval == NULL || *pval == NULL) 92 return; 93 94 if (aux != NULL && aux->asn1_cb != NULL) 95 asn1_cb = aux->asn1_cb; 96 97 switch (it->itype) { 98 case ASN1_ITYPE_PRIMITIVE: 99 if (it->templates) 100 ASN1_template_free(pval, it->templates); 101 else 102 ASN1_primitive_free(pval, it); 103 break; 104 105 case ASN1_ITYPE_MSTRING: 106 ASN1_primitive_free(pval, it); 107 break; 108 109 case ASN1_ITYPE_CHOICE: 110 if (asn1_cb) { 111 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); 112 if (i == 2) 113 return; 114 } 115 i = asn1_get_choice_selector(pval, it); 116 if ((i >= 0) && (i < it->tcount)) { 117 ASN1_VALUE **pchval; 118 tt = it->templates + i; 119 pchval = asn1_get_field_ptr(pval, tt); 120 ASN1_template_free(pchval, tt); 121 } 122 if (asn1_cb) 123 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); 124 if (!combine) { 125 free(*pval); 126 *pval = NULL; 127 } 128 break; 129 130 case ASN1_ITYPE_EXTERN: 131 ef = it->funcs; 132 if (ef && ef->asn1_ex_free) 133 ef->asn1_ex_free(pval, it); 134 break; 135 136 case ASN1_ITYPE_NDEF_SEQUENCE: 137 case ASN1_ITYPE_SEQUENCE: 138 if (asn1_do_lock(pval, -1, it) > 0) 139 return; 140 if (asn1_cb) { 141 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); 142 if (i == 2) 143 return; 144 } 145 asn1_enc_free(pval, it); 146 /* If we free up as normal we will invalidate any 147 * ANY DEFINED BY field and we wont be able to 148 * determine the type of the field it defines. So 149 * free up in reverse order. 150 */ 151 tt = it->templates + it->tcount - 1; 152 for (i = 0; i < it->tcount; tt--, i++) { 153 ASN1_VALUE **pseqval; 154 seqtt = asn1_do_adb(pval, tt, 0); 155 if (!seqtt) 156 continue; 157 pseqval = asn1_get_field_ptr(pval, seqtt); 158 ASN1_template_free(pseqval, seqtt); 159 } 160 if (asn1_cb) 161 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); 162 if (!combine) { 163 free(*pval); 164 *pval = NULL; 165 } 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_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), 180 0); 181 } 182 sk_ASN1_VALUE_free(sk); 183 *pval = NULL; 184 } else 185 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item), 186 tt->flags & ASN1_TFLG_COMBINE); 187 } 188 189 void 190 ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 191 { 192 int utype; 193 if (it) { 194 const ASN1_PRIMITIVE_FUNCS *pf; 195 pf = it->funcs; 196 if (pf && pf->prim_free) { 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