crypto/asn1/tasn_new.c

   1 /* tasn_new.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 2000.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2000-2004 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stddef.h>
  61 #include <openssl/asn1.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/err.h>
  64 #include <openssl/asn1t.h>
  65 #include <string.h>
  66 #include "asn1_locl.h"
  67
  68 static int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
  69                                int embed);
  70 static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
  71                               int embed);
  72 static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
  73 static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
  74 static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
  75 static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
  76
  77 ASN1_VALUE *ASN1_item_new(const ASN1_ITEM *it)
  78 {
  79     ASN1_VALUE *ret = NULL;
  80     if (ASN1_item_ex_new(&ret, it) > 0)
  81         return ret;
  82     return NULL;
  83 }
  84
  85 /* Allocate an ASN1 structure */
  86
  87 int ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
  88 {
  89     return asn1_item_embed_new(pval, it, 0);
  90 }
  91
  92 int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed)
  93 {
  94     const ASN1_TEMPLATE *tt = NULL;
  95     const ASN1_EXTERN_FUNCS *ef;
  96     const ASN1_AUX *aux = it->funcs;
  97     ASN1_aux_cb *asn1_cb;
  98     ASN1_VALUE **pseqval;
  99     int i;
 100     if (aux && aux->asn1_cb)
 101         asn1_cb = aux->asn1_cb;
 102     else
 103         asn1_cb = 0;
 104
 105 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 106     OPENSSL_mem_debug_push(it->sname ? it->sname : "asn1_item_embed_new");
 107 #endif
 108
 109     switch (it->itype) {
 110
 111     case ASN1_ITYPE_EXTERN:
 112         ef = it->funcs;
 113         if (ef && ef->asn1_ex_new) {
 114             if (!ef->asn1_ex_new(pval, it))
 115                 goto memerr;
 116         }
 117         break;
 118
 119     case ASN1_ITYPE_PRIMITIVE:
 120         if (it->templates) {
 121             if (!asn1_template_new(pval, it->templates))
 122                 goto memerr;
 123         } else if (!asn1_primitive_new(pval, it, embed))
 124             goto memerr;
 125         break;
 126
 127     case ASN1_ITYPE_MSTRING:
 128         if (!asn1_primitive_new(pval, it, embed))
 129             goto memerr;
 130         break;
 131
 132     case ASN1_ITYPE_CHOICE:
 133         if (asn1_cb) {
 134             i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
 135             if (!i)
 136                 goto auxerr;
 137             if (i == 2) {
 138 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 139                 OPENSSL_mem_debug_pop();
 140 #endif
 141                 return 1;
 142             }
 143         }
 144         if (embed) {
 145             memset(*pval, 0, it->size);
 146         } else {
 147             *pval = OPENSSL_zalloc(it->size);
 148             if (*pval == NULL)
 149                 goto memerr;
 150         }
 151         asn1_set_choice_selector(pval, -1, it);
 152         if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
 153             goto auxerr;
 154         break;
 155
 156     case ASN1_ITYPE_NDEF_SEQUENCE:
 157     case ASN1_ITYPE_SEQUENCE:
 158         if (asn1_cb) {
 159             i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
 160             if (!i)
 161                 goto auxerr;
 162             if (i == 2) {
 163 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 164                 OPENSSL_mem_debug_pop();
 165 #endif
 166                 return 1;
 167             }
 168         }
 169         if (embed) {
 170             memset(*pval, 0, it->size);
 171         } else {
 172             *pval = OPENSSL_zalloc(it->size);
 173             if (*pval == NULL)
 174                 goto memerr;
 175         }
 176         asn1_do_lock(pval, 0, it);
 177         asn1_enc_init(pval, it);
 178         for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
 179             pseqval = asn1_get_field_ptr(pval, tt);
 180             if (!asn1_template_new(pseqval, tt))
 181                 goto memerr;
 182         }
 183         if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
 184             goto auxerr;
 185         break;
 186     }
 187 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 188     OPENSSL_mem_debug_pop();
 189 #endif
 190     return 1;
 191
 192  memerr:
 193     ASN1err(ASN1_F_ASN1_ITEM_EMBED_NEW, ERR_R_MALLOC_FAILURE);
 194 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 195     OPENSSL_mem_debug_pop();
 196 #endif
 197     return 0;
 198
 199  auxerr:
 200     ASN1err(ASN1_F_ASN1_ITEM_EMBED_NEW, ASN1_R_AUX_ERROR);
 201     ASN1_item_ex_free(pval, it);
 202 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 203     OPENSSL_mem_debug_pop();
 204 #endif
 205     return 0;
 206
 207 }
 208
 209 static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
 210 {
 211     const ASN1_EXTERN_FUNCS *ef;
 212
 213     switch (it->itype) {
 214
 215     case ASN1_ITYPE_EXTERN:
 216         ef = it->funcs;
 217         if (ef && ef->asn1_ex_clear)
 218             ef->asn1_ex_clear(pval, it);
 219         else
 220             *pval = NULL;
 221         break;
 222
 223     case ASN1_ITYPE_PRIMITIVE:
 224         if (it->templates)
 225             asn1_template_clear(pval, it->templates);
 226         else
 227             asn1_primitive_clear(pval, it);
 228         break;
 229
 230     case ASN1_ITYPE_MSTRING:
 231         asn1_primitive_clear(pval, it);
 232         break;
 233
 234     case ASN1_ITYPE_CHOICE:
 235     case ASN1_ITYPE_SEQUENCE:
 236     case ASN1_ITYPE_NDEF_SEQUENCE:
 237         *pval = NULL;
 238         break;
 239     }
 240 }
 241
 242 static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 243 {
 244     const ASN1_ITEM *it = ASN1_ITEM_ptr(tt->item);
 245     int embed = tt->flags & ASN1_TFLG_EMBED;
 246     ASN1_VALUE *tval;
 247     int ret;
 248     if (embed) {
 249         tval = (ASN1_VALUE *)pval;
 250         pval = &tval;
 251     }
 252     if (tt->flags & ASN1_TFLG_OPTIONAL) {
 253         asn1_template_clear(pval, tt);
 254         return 1;
 255     }
 256     /* If ANY DEFINED BY nothing to do */
 257
 258     if (tt->flags & ASN1_TFLG_ADB_MASK) {
 259         *pval = NULL;
 260         return 1;
 261     }
 262 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 263     OPENSSL_mem_debug_push(tt->field_name
 264             ? tt->field_name : "asn1_template_new");
 265 #endif
 266     /* If SET OF or SEQUENCE OF, its a STACK */
 267     if (tt->flags & ASN1_TFLG_SK_MASK) {
 268         STACK_OF(ASN1_VALUE) *skval;
 269         skval = sk_ASN1_VALUE_new_null();
 270         if (!skval) {
 271             ASN1err(ASN1_F_ASN1_TEMPLATE_NEW, ERR_R_MALLOC_FAILURE);
 272             ret = 0;
 273             goto done;
 274         }
 275         *pval = (ASN1_VALUE *)skval;
 276         ret = 1;
 277         goto done;
 278     }
 279     /* Otherwise pass it back to the item routine */
 280     ret = asn1_item_embed_new(pval, it, embed);
 281  done:
 282 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 283     OPENSSL_mem_debug_pop();
 284 #endif
 285     return ret;
 286 }
 287
 288 static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 289 {
 290     /* If ADB or STACK just NULL the field */
 291     if (tt->flags & (ASN1_TFLG_ADB_MASK | ASN1_TFLG_SK_MASK))
 292         *pval = NULL;
 293     else
 294         asn1_item_clear(pval, ASN1_ITEM_ptr(tt->item));
 295 }
 296
 297 /*
 298  * NB: could probably combine most of the real XXX_new() behaviour and junk
 299  * all the old functions.
 300  */
 301
 302 static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
 303                               int embed)
 304 {
 305     ASN1_TYPE *typ;
 306     ASN1_STRING *str;
 307     int utype;
 308
 309     if (!it)
 310         return 0;
 311
 312     if (it->funcs) {
 313         const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
 314         if (pf->prim_new)
 315             return pf->prim_new(pval, it);
 316     }
 317
 318     if (it->itype == ASN1_ITYPE_MSTRING)
 319         utype = -1;
 320     else
 321         utype = it->utype;
 322     switch (utype) {
 323     case V_ASN1_OBJECT:
 324         *pval = (ASN1_VALUE *)OBJ_nid2obj(NID_undef);
 325         return 1;
 326
 327     case V_ASN1_BOOLEAN:
 328         *(ASN1_BOOLEAN *)pval = it->size;
 329         return 1;
 330
 331     case V_ASN1_NULL:
 332         *pval = (ASN1_VALUE *)1;
 333         return 1;
 334
 335     case V_ASN1_ANY:
 336         typ = OPENSSL_malloc(sizeof(*typ));
 337         if (typ == NULL)
 338             return 0;
 339         typ->value.ptr = NULL;
 340         typ->type = -1;
 341         *pval = (ASN1_VALUE *)typ;
 342         break;
 343
 344     default:
 345         if (embed) {
 346             str = *(ASN1_STRING **)pval;
 347             memset(str, 0, sizeof(*str));
 348             str->type = utype;
 349             str->flags = ASN1_STRING_FLAG_EMBED;
 350         } else {
 351             str = ASN1_STRING_type_new(utype);
 352             *pval = (ASN1_VALUE *)str;
 353         }
 354         if (it->itype == ASN1_ITYPE_MSTRING && str)
 355             str->flags |= ASN1_STRING_FLAG_MSTRING;
 356         break;
 357     }
 358     if (*pval)
 359         return 1;
 360     return 0;
 361 }
 362
 363 static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
 364 {
 365     int utype;
 366     if (it && it->funcs) {
 367         const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
 368         if (pf->prim_clear)
 369             pf->prim_clear(pval, it);
 370         else
 371             *pval = NULL;
 372         return;
 373     }
 374     if (!it || (it->itype == ASN1_ITYPE_MSTRING))
 375         utype = -1;
 376     else
 377         utype = it->utype;
 378     if (utype == V_ASN1_BOOLEAN)
 379         *(ASN1_BOOLEAN *)pval = it->size;
 380     else
 381         *pval = NULL;
 382 }