1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <openssl/asn1.h> 58 59 #include <openssl/asn1t.h> 60 #include <openssl/mem.h> 61 62 #include "asn1_locl.h" 63 64 /* Free up an ASN1 structure */ 65 66 void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it) 67 { 68 asn1_item_combine_free(&val, it, 0); 69 } 70 71 void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 72 { 73 asn1_item_combine_free(pval, it, 0); 74 } 75 76 void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine) 77 { 78 const ASN1_TEMPLATE *tt = NULL, *seqtt; 79 const ASN1_EXTERN_FUNCS *ef; 80 const ASN1_COMPAT_FUNCS *cf; 81 const ASN1_AUX *aux = it->funcs; 82 ASN1_aux_cb *asn1_cb; 83 int i; 84 if (!pval) 85 return; 86 if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) 87 return; 88 if (aux && aux->asn1_cb) 89 asn1_cb = aux->asn1_cb; 90 else 91 asn1_cb = 0; 92 93 switch (it->itype) { 94 95 case ASN1_ITYPE_PRIMITIVE: 96 if (it->templates) 97 ASN1_template_free(pval, it->templates); 98 else 99 ASN1_primitive_free(pval, it); 100 break; 101 102 case ASN1_ITYPE_MSTRING: 103 ASN1_primitive_free(pval, it); 104 break; 105 106 case ASN1_ITYPE_CHOICE: 107 if (asn1_cb) { 108 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); 109 if (i == 2) 110 return; 111 } 112 i = asn1_get_choice_selector(pval, it); 113 if ((i >= 0) && (i < it->tcount)) { 114 ASN1_VALUE **pchval; 115 tt = it->templates + i; 116 pchval = asn1_get_field_ptr(pval, tt); 117 ASN1_template_free(pchval, tt); 118 } 119 if (asn1_cb) 120 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); 121 if (!combine) { 122 OPENSSL_free(*pval); 123 *pval = NULL; 124 } 125 break; 126 127 case ASN1_ITYPE_COMPAT: 128 cf = it->funcs; 129 if (cf && cf->asn1_free) 130 cf->asn1_free(*pval); 131 break; 132 133 case ASN1_ITYPE_EXTERN: 134 ef = it->funcs; 135 if (ef && ef->asn1_ex_free) 136 ef->asn1_ex_free(pval, it); 137 break; 138 139 case ASN1_ITYPE_NDEF_SEQUENCE: 140 case ASN1_ITYPE_SEQUENCE: 141 if (!asn1_refcount_dec_and_test_zero(pval, it)) 142 return; 143 if (asn1_cb) { 144 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); 145 if (i == 2) 146 return; 147 } 148 asn1_enc_free(pval, it); 149 /* 150 * If we free up as normal we will invalidate any ANY DEFINED BY 151 * field and we wont be able to determine the type of the field it 152 * defines. So free up in reverse order. 153 */ 154 tt = it->templates + it->tcount - 1; 155 for (i = 0; i < it->tcount; tt--, i++) { 156 ASN1_VALUE **pseqval; 157 seqtt = asn1_do_adb(pval, tt, 0); 158 if (!seqtt) 159 continue; 160 pseqval = asn1_get_field_ptr(pval, seqtt); 161 ASN1_template_free(pseqval, seqtt); 162 } 163 if (asn1_cb) 164 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); 165 if (!combine) { 166 OPENSSL_free(*pval); 167 *pval = NULL; 168 } 169 break; 170 } 171 } 172 173 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) 174 { 175 size_t 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_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), 0); 182 } 183 sk_ASN1_VALUE_free(sk); 184 *pval = NULL; 185 } else 186 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item), 187 tt->flags & ASN1_TFLG_COMBINE); 188 } 189 190 void 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 OPENSSL_free(*pval); 236 break; 237 238 default: 239 ASN1_STRING_free((ASN1_STRING *)*pval); 240 *pval = NULL; 241 break; 242 } 243 *pval = NULL; 244 } 245
