Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* tasn_fre.c */ |
| 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, 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) |
| 88 | return; |
| 89 | if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) |
| 90 | return; |
| 91 | if (aux && aux->asn1_cb) |
| 92 | asn1_cb = aux->asn1_cb; |
| 93 | else |
| 94 | asn1_cb = 0; |
| 95 | |
| 96 | switch(it->itype) |
| 97 | { |
| 98 | |
| 99 | case ASN1_ITYPE_PRIMITIVE: |
| 100 | if (it->templates) |
| 101 | ASN1_template_free(pval, it->templates); |
| 102 | else |
| 103 | ASN1_primitive_free(pval, it); |
| 104 | break; |
| 105 | |
| 106 | case ASN1_ITYPE_MSTRING: |
| 107 | ASN1_primitive_free(pval, it); |
| 108 | break; |
| 109 | |
| 110 | case ASN1_ITYPE_CHOICE: |
| 111 | if (asn1_cb) |
| 112 | { |
| 113 | i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); |
| 114 | if (i == 2) |
| 115 | return; |
| 116 | } |
| 117 | i = asn1_get_choice_selector(pval, it); |
| 118 | if ((i >= 0) && (i < it->tcount)) |
| 119 | { |
| 120 | ASN1_VALUE **pchval; |
| 121 | tt = it->templates + i; |
| 122 | pchval = asn1_get_field_ptr(pval, tt); |
| 123 | ASN1_template_free(pchval, tt); |
| 124 | } |
| 125 | if (asn1_cb) |
| 126 | asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); |
| 127 | if (!combine) |
| 128 | { |
| 129 | OPENSSL_free(*pval); |
| 130 | *pval = NULL; |
| 131 | } |
| 132 | break; |
| 133 | |
| 134 | case ASN1_ITYPE_COMPAT: |
| 135 | cf = it->funcs; |
| 136 | if (cf && cf->asn1_free) |
| 137 | cf->asn1_free(*pval); |
| 138 | break; |
| 139 | |
| 140 | case ASN1_ITYPE_EXTERN: |
| 141 | ef = it->funcs; |
| 142 | if (ef && ef->asn1_ex_free) |
| 143 | ef->asn1_ex_free(pval, it); |
| 144 | break; |
| 145 | |
| 146 | case ASN1_ITYPE_NDEF_SEQUENCE: |
| 147 | case ASN1_ITYPE_SEQUENCE: |
| 148 | if (asn1_do_lock(pval, -1, it) > 0) |
| 149 | return; |
| 150 | if (asn1_cb) |
| 151 | { |
| 152 | i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); |
| 153 | if (i == 2) |
| 154 | return; |
| 155 | } |
| 156 | asn1_enc_free(pval, it); |
| 157 | /* If we free up as normal we will invalidate any |
| 158 | * ANY DEFINED BY field and we wont be able to |
| 159 | * determine the type of the field it defines. So |
| 160 | * free up in reverse order. |
| 161 | */ |
| 162 | tt = it->templates + it->tcount - 1; |
| 163 | for (i = 0; i < it->tcount; tt--, i++) |
| 164 | { |
| 165 | ASN1_VALUE **pseqval; |
| 166 | seqtt = asn1_do_adb(pval, tt, 0); |
| 167 | if (!seqtt) |
| 168 | continue; |
| 169 | pseqval = asn1_get_field_ptr(pval, seqtt); |
| 170 | ASN1_template_free(pseqval, seqtt); |
| 171 | } |
| 172 | if (asn1_cb) |
| 173 | asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); |
| 174 | if (!combine) |
| 175 | { |
| 176 | OPENSSL_free(*pval); |
| 177 | *pval = NULL; |
| 178 | } |
| 179 | break; |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) |
| 184 | { |
| 185 | int i; |
| 186 | if (tt->flags & ASN1_TFLG_SK_MASK) |
| 187 | { |
| 188 | STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval; |
| 189 | for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) |
| 190 | { |
| 191 | ASN1_VALUE *vtmp; |
| 192 | vtmp = sk_ASN1_VALUE_value(sk, i); |
| 193 | asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), |
| 194 | 0); |
| 195 | } |
| 196 | sk_ASN1_VALUE_free(sk); |
| 197 | *pval = NULL; |
| 198 | } |
| 199 | else |
| 200 | asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item), |
| 201 | tt->flags & ASN1_TFLG_COMBINE); |
| 202 | } |
| 203 | |
| 204 | void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it) |
| 205 | { |
| 206 | int utype; |
| 207 | if (it) |
| 208 | { |
| 209 | const ASN1_PRIMITIVE_FUNCS *pf; |
| 210 | pf = it->funcs; |
| 211 | if (pf && pf->prim_free) |
| 212 | { |
| 213 | pf->prim_free(pval, it); |
| 214 | return; |
| 215 | } |
| 216 | } |
| 217 | /* Special case: if 'it' is NULL free contents of ASN1_TYPE */ |
| 218 | if (!it) |
| 219 | { |
| 220 | ASN1_TYPE *typ = (ASN1_TYPE *)*pval; |
| 221 | utype = typ->type; |
| 222 | pval = &typ->value.asn1_value; |
| 223 | if (!*pval) |
| 224 | return; |
| 225 | } |
| 226 | else if (it->itype == ASN1_ITYPE_MSTRING) |
| 227 | { |
| 228 | utype = -1; |
| 229 | if (!*pval) |
| 230 | return; |
| 231 | } |
| 232 | else |
| 233 | { |
| 234 | utype = it->utype; |
| 235 | if ((utype != V_ASN1_BOOLEAN) && !*pval) |
| 236 | return; |
| 237 | } |
| 238 | |
| 239 | switch(utype) |
| 240 | { |
| 241 | case V_ASN1_OBJECT: |
| 242 | ASN1_OBJECT_free((ASN1_OBJECT *)*pval); |
| 243 | break; |
| 244 | |
| 245 | case V_ASN1_BOOLEAN: |
| 246 | if (it) |
| 247 | *(ASN1_BOOLEAN *)pval = it->size; |
| 248 | else |
| 249 | *(ASN1_BOOLEAN *)pval = -1; |
| 250 | return; |
| 251 | |
| 252 | case V_ASN1_NULL: |
| 253 | break; |
| 254 | |
| 255 | case V_ASN1_ANY: |
| 256 | ASN1_primitive_free(pval, NULL); |
| 257 | OPENSSL_free(*pval); |
| 258 | break; |
| 259 | |
| 260 | default: |
| 261 | ASN1_STRING_free((ASN1_STRING *)*pval); |
| 262 | *pval = NULL; |
| 263 | break; |
| 264 | } |
| 265 | *pval = NULL; |
| 266 | } |