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 auxerr;
 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         asn1_do_lock(pval, 0, it);
 127         asn1_enc_init(pval, it);
 128         for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
 129             pseqval = asn1_get_field_ptr(pval, tt);
 130             if (!asn1_template_new(pseqval, tt))
 131                 goto memerr;
 132         }
 133         if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
 134             goto auxerr;
 135         break;
 136     }
 137 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 138     OPENSSL_mem_debug_pop();
 139 #endif
 140     return 1;
 141
 142  memerr:
 143     ASN1err(ASN1_F_ASN1_ITEM_EMBED_NEW, ERR_R_MALLOC_FAILURE);
 144 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 145     OPENSSL_mem_debug_pop();
 146 #endif
 147     return 0;
 148
 149  auxerr:
 150     ASN1err(ASN1_F_ASN1_ITEM_EMBED_NEW, ASN1_R_AUX_ERROR);
 151     ASN1_item_ex_free(pval, it);
 152 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 153     OPENSSL_mem_debug_pop();
 154 #endif
 155     return 0;
 156
 157 }
 158
 159 static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
 160 {
 161     const ASN1_EXTERN_FUNCS *ef;
 162
 163     switch (it->itype) {
 164
 165     case ASN1_ITYPE_EXTERN:
 166         ef = it->funcs;
 167         if (ef && ef->asn1_ex_clear)
 168             ef->asn1_ex_clear(pval, it);
 169         else
 170             *pval = NULL;
 171         break;
 172
 173     case ASN1_ITYPE_PRIMITIVE:
 174         if (it->templates)
 175             asn1_template_clear(pval, it->templates);
 176         else
 177             asn1_primitive_clear(pval, it);
 178         break;
 179
 180     case ASN1_ITYPE_MSTRING:
 181         asn1_primitive_clear(pval, it);
 182         break;
 183
 184     case ASN1_ITYPE_CHOICE:
 185     case ASN1_ITYPE_SEQUENCE:
 186     case ASN1_ITYPE_NDEF_SEQUENCE:
 187         *pval = NULL;
 188         break;
 189     }
 190 }
 191
 192 static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 193 {
 194     const ASN1_ITEM *it = ASN1_ITEM_ptr(tt->item);
 195     int embed = tt->flags & ASN1_TFLG_EMBED;
 196     ASN1_VALUE *tval;
 197     int ret;
 198     if (embed) {
 199         tval = (ASN1_VALUE *)pval;
 200         pval = &tval;
 201     }
 202     if (tt->flags & ASN1_TFLG_OPTIONAL) {
 203         asn1_template_clear(pval, tt);
 204         return 1;
 205     }
 206     /* If ANY DEFINED BY nothing to do */
 207
 208     if (tt->flags & ASN1_TFLG_ADB_MASK) {
 209         *pval = NULL;
 210         return 1;
 211     }
 212 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 213     OPENSSL_mem_debug_push(tt->field_name
 214             ? tt->field_name : "asn1_template_new");
 215 #endif
 216     /* If SET OF or SEQUENCE OF, its a STACK */
 217     if (tt->flags & ASN1_TFLG_SK_MASK) {
 218         STACK_OF(ASN1_VALUE) *skval;
 219         skval = sk_ASN1_VALUE_new_null();
 220         if (!skval) {
 221             ASN1err(ASN1_F_ASN1_TEMPLATE_NEW, ERR_R_MALLOC_FAILURE);
 222             ret = 0;
 223             goto done;
 224         }
 225         *pval = (ASN1_VALUE *)skval;
 226         ret = 1;
 227         goto done;
 228     }
 229     /* Otherwise pass it back to the item routine */
 230     ret = asn1_item_embed_new(pval, it, embed);
 231  done:
 232 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 233     OPENSSL_mem_debug_pop();
 234 #endif
 235     return ret;
 236 }
 237
 238 static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 239 {
 240     /* If ADB or STACK just NULL the field */
 241     if (tt->flags & (ASN1_TFLG_ADB_MASK | ASN1_TFLG_SK_MASK))
 242         *pval = NULL;
 243     else
 244         asn1_item_clear(pval, ASN1_ITEM_ptr(tt->item));
 245 }
 246
 247 /*
 248  * NB: could probably combine most of the real XXX_new() behaviour and junk
 249  * all the old functions.
 250  */
 251
 252 static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
 253                               int embed)
 254 {
 255     ASN1_TYPE *typ;
 256     ASN1_STRING *str;
 257     int utype;
 258
 259     if (!it)
 260         return 0;
 261
 262     if (it->funcs) {
 263         const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
 264         if (pf->prim_new)
 265             return pf->prim_new(pval, it);
 266     }
 267
 268     if (it->itype == ASN1_ITYPE_MSTRING)
 269         utype = -1;
 270     else
 271         utype = it->utype;
 272     switch (utype) {
 273     case V_ASN1_OBJECT:
 274         *pval = (ASN1_VALUE *)OBJ_nid2obj(NID_undef);
 275         return 1;
 276
 277     case V_ASN1_BOOLEAN:
 278         *(ASN1_BOOLEAN *)pval = it->size;
 279         return 1;
 280
 281     case V_ASN1_NULL:
 282         *pval = (ASN1_VALUE *)1;
 283         return 1;
 284
 285     case V_ASN1_ANY:
 286         typ = OPENSSL_malloc(sizeof(*typ));
 287         if (typ == NULL)
 288             return 0;
 289         typ->value.ptr = NULL;
 290         typ->type = -1;
 291         *pval = (ASN1_VALUE *)typ;
 292         break;
 293
 294     default:
 295         if (embed) {
 296             str = *(ASN1_STRING **)pval;
 297             memset(str, 0, sizeof(*str));
 298             str->type = utype;
 299             str->flags = ASN1_STRING_FLAG_EMBED;
 300         } else {
 301             str = ASN1_STRING_type_new(utype);
 302             *pval = (ASN1_VALUE *)str;
 303         }
 304         if (it->itype == ASN1_ITYPE_MSTRING && str)
 305             str->flags |= ASN1_STRING_FLAG_MSTRING;
 306         break;
 307     }
 308     if (*pval)
 309         return 1;
 310     return 0;
 311 }
 312
 313 static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
 314 {
 315     int utype;
 316     if (it && it->funcs) {
 317         const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
 318         if (pf->prim_clear)
 319             pf->prim_clear(pval, it);
 320         else
 321             *pval = NULL;
 322         return;
 323     }
 324     if (!it || (it->itype == ASN1_ITYPE_MSTRING))
 325         utype = -1;
 326     else
 327         utype = it->utype;
 328     if (utype == V_ASN1_BOOLEAN)
 329         *(ASN1_BOOLEAN *)pval = it->size;
 330     else
 331         *pval = NULL;
 332 }