1 /* tasn_fre.c */ 2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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) return; 88 if((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) return; 89 if(aux && aux->asn1_cb) asn1_cb = aux->asn1_cb; 90 else asn1_cb = 0; 91 92 switch(it->itype) { 93 94 case ASN1_ITYPE_PRIMITIVE: 95 if(it->templates) ASN1_template_free(pval, it->templates); 96 else ASN1_primitive_free(pval, it); 97 break; 98 99 case ASN1_ITYPE_MSTRING: 100 ASN1_primitive_free(pval, it); 101 break; 102 103 case ASN1_ITYPE_CHOICE: 104 if(asn1_cb) { 105 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it); 106 if(i == 2) return; 107 } 108 i = asn1_get_choice_selector(pval, it); 109 if(asn1_cb) asn1_cb(ASN1_OP_FREE_PRE, pval, it); 110 if((i >= 0) && (i < it->tcount)) { 111 ASN1_VALUE **pchval; 112 tt = it->templates + i; 113 pchval = asn1_get_field_ptr(pval, tt); 114 ASN1_template_free(pchval, tt); 115 } 116 if(asn1_cb) asn1_cb(ASN1_OP_FREE_POST, pval, it); 117 if(!combine) { 118 OPENSSL_free(*pval); 119 *pval = NULL; 120 } 121 break; 122 123 case ASN1_ITYPE_COMPAT: 124 cf = it->funcs; 125 if(cf && cf->asn1_free) cf->asn1_free(*pval); 126 break; 127 128 case ASN1_ITYPE_EXTERN: 129 ef = it->funcs; 130 if(ef && ef->asn1_ex_free) ef->asn1_ex_free(pval, it); 131 break; 132 133 case ASN1_ITYPE_SEQUENCE: 134 if(asn1_do_lock(pval, -1, it) > 0) return; 135 if(asn1_cb) { 136 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it); 137 if(i == 2) return; 138 } 139 asn1_enc_free(pval, it); 140 /* If we free up as normal we will invalidate any 141 * ANY DEFINED BY field and we wont be able to 142 * determine the type of the field it defines. So 143 * free up in reverse order. 144 */ 145 tt = it->templates + it->tcount - 1; 146 for(i = 0; i < it->tcount; tt--, i++) { 147 ASN1_VALUE **pseqval; 148 seqtt = asn1_do_adb(pval, tt, 0); 149 if(!seqtt) continue; 150 pseqval = asn1_get_field_ptr(pval, seqtt); 151 ASN1_template_free(pseqval, seqtt); 152 } 153 if(asn1_cb) asn1_cb(ASN1_OP_FREE_POST, pval, it); 154 if(!combine) { 155 OPENSSL_free(*pval); 156 *pval = NULL; 157 } 158 break; 159 } 160 } 161 162 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) 163 { 164 int i; 165 if(tt->flags & ASN1_TFLG_SK_MASK) { 166 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval; 167 for(i = 0; i < sk_ASN1_VALUE_num(sk); i++) { 168 ASN1_VALUE *vtmp; 169 vtmp = sk_ASN1_VALUE_value(sk, i); 170 asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), 0); 171 } 172 sk_ASN1_VALUE_free(sk); 173 *pval = NULL; 174 } else asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item), 175 tt->flags & ASN1_TFLG_COMBINE); 176 } 177 178 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 179 { 180 int utype; 181 if(it) { 182 const ASN1_PRIMITIVE_FUNCS *pf; 183 pf = it->funcs; 184 if(pf && pf->prim_free) { 185 pf->prim_free(pval, it); 186 return; 187 } 188 } 189 /* Special case: if 'it' is NULL free contents of ASN1_TYPE */ 190 if(!it) { 191 ASN1_TYPE *typ = (ASN1_TYPE *)*pval; 192 utype = typ->type; 193 pval = (ASN1_VALUE **)&typ->value.ptr; 194 if(!*pval) return; 195 } else if(it->itype == ASN1_ITYPE_MSTRING) { 196 utype = -1; 197 if(!*pval) return; 198 } else { 199 utype = it->utype; 200 if((utype != V_ASN1_BOOLEAN) && !*pval) return; 201 } 202 203 switch(utype) { 204 case V_ASN1_OBJECT: 205 ASN1_OBJECT_free((ASN1_OBJECT *)*pval); 206 break; 207 208 case V_ASN1_BOOLEAN: 209 if (it) 210 *(ASN1_BOOLEAN *)pval = it->size; 211 else 212 *(ASN1_BOOLEAN *)pval = -1; 213 return; 214 215 case V_ASN1_NULL: 216 break; 217 218 case V_ASN1_ANY: 219 ASN1_primitive_free(pval, NULL); 220 OPENSSL_free(*pval); 221 break; 222 223 default: 224 ASN1_STRING_free((ASN1_STRING *)*pval); 225 *pval = NULL; 226 break; 227 } 228 *pval = NULL; 229 } 230