crypto/asn1/tasn_new.c

   1 /*
   2  * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stddef.h>
  11 #include <openssl/asn1.h>
  12 #include <openssl/objects.h>
  13 #include <openssl/err.h>
  14 #include <openssl/asn1t.h>
  15 #include <string.h>
  16 #include "asn1_locl.h"
  17
  18 static int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
  19                                int embed);
  20 static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
  21                               int embed);
  22 static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
  23 static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
  24 static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
  25 static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
  26
  27 ASN1_VALUE *ASN1_item_new(const ASN1_ITEM *it)
  28 {
  29     ASN1_VALUE *ret = NULL;
  30     if (ASN1_item_ex_new(&ret, it) > 0)
  31         return ret;
  32     return NULL;
  33 }
  34
  35 /* Allocate an ASN1 structure */
  36
  37 int ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
  38 {
  39     return asn1_item_embed_new(pval, it, 0);
  40 }
  41
  42 int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed)
  43 {
  44     const ASN1_TEMPLATE *tt = NULL;
  45     const ASN1_EXTERN_FUNCS *ef;
  46     const ASN1_AUX *aux = it->funcs;
  47     ASN1_aux_cb *asn1_cb;
  48     ASN1_VALUE **pseqval;
  49     int i;
  50     if (aux && aux->asn1_cb)
  51         asn1_cb = aux->asn1_cb;
  52     else
  53         asn1_cb = 0;
  54
  55 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  56     OPENSSL_mem_debug_push(it->sname ? it->sname : "asn1_item_embed_new");
  57 #endif
  58
  59     switch (it->itype) {
  60
  61     case ASN1_ITYPE_EXTERN:
  62         ef = it->funcs;
  63         if (ef && ef->asn1_ex_new) {
  64             if (!ef->asn1_ex_new(pval, it))
  65                 goto memerr;
  66         }
  67         break;
  68
  69     case ASN1_ITYPE_PRIMITIVE:
  70         if (it->templates) {
  71             if (!asn1_template_new(pval, it->templates))
  72                 goto memerr;
  73         } else if (!asn1_primitive_new(pval, it, embed))
  74             goto memerr;
  75         break;
  76
  77     case ASN1_ITYPE_MSTRING:
  78         if (!asn1_primitive_new(pval, it, embed))
  79             goto memerr;
  80         break;
  81
  82     case ASN1_ITYPE_CHOICE:
  83         if (asn1_cb) {
  84             i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
  85             if (!i)
  86                 goto auxerr;
  87             if (i == 2) {
  88 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  89                 OPENSSL_mem_debug_pop();
  90 #endif
  91                 return 1;
  92             }
  93         }
  94         if (embed) {
  95             memset(*pval, 0, it->size);
  96         } else {
  97             *pval = OPENSSL_zalloc(it->size);
  98             if (*pval == NULL)
  99                 goto memerr;
 100         }
 101         asn1_set_choice_selector(pval, -1, it);
 102         if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
 103             goto auxerr2;
 104         break;
 105
 106     case ASN1_ITYPE_NDEF_SEQUENCE:
 107     case ASN1_ITYPE_SEQUENCE:
 108         if (asn1_cb) {
 109             i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
 110             if (!i)
 111                 goto auxerr;
 112             if (i == 2) {
 113 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 114                 OPENSSL_mem_debug_pop();
 115 #endif
 116                 return 1;
 117             }
 118         }
 119         if (embed) {
 120             memset(*pval, 0, it->size);
 121         } else {
 122             *pval = OPENSSL_zalloc(it->size);
 123             if (*pval == NULL)
 124                 goto memerr;
 125         }
 126         /* 0 : init. lock */
 127         if (asn1_do_lock(pval, 0, it) < 0) {
 128             if (!embed) {
 129                 OPENSSL_free(*pval);
 130                 *pval = NULL;
 131             }
 132             goto memerr;
 133         }
 134         asn1_enc_init(pval, it);
 135         for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
 136             pseqval = asn1_get_field_ptr(pval, tt);
 137             if (!asn1_template_new(pseqval, tt))
 138                 goto memerr2;
 139         }
 140         if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
 141             goto auxerr2;
 142         break;
 143     }
 144 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 145     OPENSSL_mem_debug_pop();
 146 #endif
 147     return 1;
 148
 149  memerr2:
 150     asn1_item_embed_free(pval, it, embed);
 151  memerr:
 152     ASN1err(ASN1_F_ASN1_ITEM_EMBED_NEW, ERR_R_MALLOC_FAILURE);
 153 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 154     OPENSSL_mem_debug_pop();
 155 #endif
 156     return 0;
 157
 158  auxerr2:
 159     asn1_item_embed_free(pval, it, embed);
 160  auxerr:
 161     ASN1err(ASN1_F_ASN1_ITEM_EMBED_NEW, ASN1_R_AUX_ERROR);
 162 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 163     OPENSSL_mem_debug_pop();
 164 #endif
 165     return 0;
 166
 167 }
 168
 169 static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
 170 {
 171     const ASN1_EXTERN_FUNCS *ef;
 172
 173     switch (it->itype) {
 174
 175     case ASN1_ITYPE_EXTERN:
 176         ef = it->funcs;
 177         if (ef && ef->asn1_ex_clear)
 178             ef->asn1_ex_clear(pval, it);
 179         else
 180             *pval = NULL;
 181         break;
 182
 183     case ASN1_ITYPE_PRIMITIVE:
 184         if (it->templates)
 185             asn1_template_clear(pval, it->templates);
 186         else
 187             asn1_primitive_clear(pval, it);
 188         break;
 189
 190     case ASN1_ITYPE_MSTRING:
 191         asn1_primitive_clear(pval, it);
 192         break;
 193
 194     case ASN1_ITYPE_CHOICE:
 195     case ASN1_ITYPE_SEQUENCE:
 196     case ASN1_ITYPE_NDEF_SEQUENCE:
 197         *pval = NULL;
 198         break;
 199     }
 200 }
 201
 202 static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 203 {
 204     const ASN1_ITEM *it = ASN1_ITEM_ptr(tt->item);
 205     int embed = tt->flags & ASN1_TFLG_EMBED;
 206     ASN1_VALUE *tval;
 207     int ret;
 208     if (embed) {
 209         tval = (ASN1_VALUE *)pval;
 210         pval = &tval;
 211     }
 212     if (tt->flags & ASN1_TFLG_OPTIONAL) {
 213         asn1_template_clear(pval, tt);
 214         return 1;
 215     }
 216     /* If ANY DEFINED BY nothing to do */
 217
 218     if (tt->flags & ASN1_TFLG_ADB_MASK) {
 219         *pval = NULL;
 220         return 1;
 221     }
 222 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 223     OPENSSL_mem_debug_push(tt->field_name
 224             ? tt->field_name : "asn1_template_new");
 225 #endif
 226     /* If SET OF or SEQUENCE OF, its a STACK */
 227     if (tt->flags & ASN1_TFLG_SK_MASK) {
 228         STACK_OF(ASN1_VALUE) *skval;
 229         skval = sk_ASN1_VALUE_new_null();
 230         if (!skval) {
 231             ASN1err(ASN1_F_ASN1_TEMPLATE_NEW, ERR_R_MALLOC_FAILURE);
 232             ret = 0;
 233             goto done;
 234         }
 235         *pval = (ASN1_VALUE *)skval;
 236         ret = 1;
 237         goto done;
 238     }
 239     /* Otherwise pass it back to the item routine */
 240     ret = asn1_item_embed_new(pval, it, embed);
 241  done:
 242 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 243     OPENSSL_mem_debug_pop();
 244 #endif
 245     return ret;
 246 }
 247
 248 static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 249 {
 250     /* If ADB or STACK just NULL the field */
 251     if (tt->flags & (ASN1_TFLG_ADB_MASK | ASN1_TFLG_SK_MASK))
 252         *pval = NULL;
 253     else
 254         asn1_item_clear(pval, ASN1_ITEM_ptr(tt->item));
 255 }
 256
 257 /*
 258  * NB: could probably combine most of the real XXX_new() behaviour and junk
 259  * all the old functions.
 260  */
 261
 262 static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
 263                               int embed)
 264 {
 265     ASN1_TYPE *typ;
 266     ASN1_STRING *str;
 267     int utype;
 268
 269     if (!it)
 270         return 0;
 271
 272     if (it->funcs) {
 273         const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
 274         if (embed) {
 275             if (pf->prim_clear) {
 276                 pf->prim_clear(pval, it);
 277                 return 1;
 278             }
 279         } else if (pf->prim_new) {
 280             return pf->prim_new(pval, it);
 281         }
 282     }
 283
 284     if (it->itype == ASN1_ITYPE_MSTRING)
 285         utype = -1;
 286     else
 287         utype = it->utype;
 288     switch (utype) {
 289     case V_ASN1_OBJECT:
 290         *pval = (ASN1_VALUE *)OBJ_nid2obj(NID_undef);
 291         return 1;
 292
 293     case V_ASN1_BOOLEAN:
 294         *(ASN1_BOOLEAN *)pval = it->size;
 295         return 1;
 296
 297     case V_ASN1_NULL:
 298         *pval = (ASN1_VALUE *)1;
 299         return 1;
 300
 301     case V_ASN1_ANY:
 302         if ((typ = OPENSSL_malloc(sizeof(*typ))) == NULL) {
 303             ASN1err(ASN1_F_ASN1_PRIMITIVE_NEW, ERR_R_MALLOC_FAILURE);
 304             return 0;
 305         }
 306         typ->value.ptr = NULL;
 307         typ->type = -1;
 308         *pval = (ASN1_VALUE *)typ;
 309         break;
 310
 311     default:
 312         if (embed) {
 313             str = *(ASN1_STRING **)pval;
 314             memset(str, 0, sizeof(*str));
 315             str->type = utype;
 316             str->flags = ASN1_STRING_FLAG_EMBED;
 317         } else {
 318             str = ASN1_STRING_type_new(utype);
 319             *pval = (ASN1_VALUE *)str;
 320         }
 321         if (it->itype == ASN1_ITYPE_MSTRING && str)
 322             str->flags |= ASN1_STRING_FLAG_MSTRING;
 323         break;
 324     }
 325     if (*pval)
 326         return 1;
 327     return 0;
 328 }
 329
 330 static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
 331 {
 332     int utype;
 333     if (it && it->funcs) {
 334         const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
 335         if (pf->prim_clear)
 336             pf->prim_clear(pval, it);
 337         else
 338             *pval = NULL;
 339         return;
 340     }
 341     if (!it || (it->itype == ASN1_ITYPE_MSTRING))
 342         utype = -1;
 343     else
 344         utype = it->utype;
 345     if (utype == V_ASN1_BOOLEAN)
 346         *(ASN1_BOOLEAN *)pval = it->size;
 347     else
 348         *pval = NULL;
 349 }