crypto/asn1/tasn_new.c

   1 /*
   2  * Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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_local.h"
  17
  18 static int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
  19                                int embed, OSSL_LIB_CTX *libctx,
  20                                const char *propq);
  21 static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
  22                               int embed);
  23 static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
  24 static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,
  25                              OSSL_LIB_CTX *libctx, const char *propq);
  26 static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
  27 static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
  28
  29 ASN1_VALUE *ASN1_item_new(const ASN1_ITEM *it)
  30 {
  31     ASN1_VALUE *ret = NULL;
  32     if (ASN1_item_ex_new(&ret, it) > 0)
  33         return ret;
  34     return NULL;
  35 }
  36
  37 ASN1_VALUE *ASN1_item_new_ex(const ASN1_ITEM *it, OSSL_LIB_CTX *libctx,
  38                              const char *propq)
  39 {
  40     ASN1_VALUE *ret = NULL;
  41     if (asn1_item_embed_new(&ret, it, 0, libctx, propq) > 0)
  42         return ret;
  43     return NULL;
  44 }
  45
  46 /* Allocate an ASN1 structure */
  47
  48
  49 int ossl_asn1_item_ex_new_intern(ASN1_VALUE **pval, const ASN1_ITEM *it,
  50                                  OSSL_LIB_CTX *libctx, const char *propq)
  51 {
  52     return asn1_item_embed_new(pval, it, 0, libctx, propq);
  53 }
  54
  55 int ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
  56 {
  57     return asn1_item_embed_new(pval, it, 0, NULL, NULL);
  58 }
  59
  60 int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed,
  61                         OSSL_LIB_CTX *libctx, const char *propq)
  62 {
  63     const ASN1_TEMPLATE *tt = NULL;
  64     const ASN1_EXTERN_FUNCS *ef;
  65     const ASN1_AUX *aux = it->funcs;
  66     ASN1_aux_cb *asn1_cb;
  67     ASN1_VALUE **pseqval;
  68     int i;
  69     if (aux && aux->asn1_cb)
  70         asn1_cb = aux->asn1_cb;
  71     else
  72         asn1_cb = 0;
  73
  74     switch (it->itype) {
  75
  76     case ASN1_ITYPE_EXTERN:
  77         ef = it->funcs;
  78         if (ef != NULL) {
  79             if (ef->asn1_ex_new_ex != NULL) {
  80                 if (!ef->asn1_ex_new_ex(pval, it, libctx, propq))
  81                     goto memerr;
  82             } else if (ef->asn1_ex_new != NULL) {
  83                 if (!ef->asn1_ex_new(pval, it))
  84                     goto memerr;
  85             }
  86         }
  87         break;
  88
  89     case ASN1_ITYPE_PRIMITIVE:
  90         if (it->templates) {
  91             if (!asn1_template_new(pval, it->templates, libctx, propq))
  92                 goto memerr;
  93         } else if (!asn1_primitive_new(pval, it, embed))
  94             goto memerr;
  95         break;
  96
  97     case ASN1_ITYPE_MSTRING:
  98         if (!asn1_primitive_new(pval, it, embed))
  99             goto memerr;
 100         break;
 101
 102     case ASN1_ITYPE_CHOICE:
 103         if (asn1_cb) {
 104             i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
 105             if (!i)
 106                 goto auxerr;
 107             if (i == 2) {
 108                 return 1;
 109             }
 110         }
 111         if (embed) {
 112             memset(*pval, 0, it->size);
 113         } else {
 114             *pval = OPENSSL_zalloc(it->size);
 115             if (*pval == NULL)
 116                 goto memerr;
 117         }
 118         ossl_asn1_set_choice_selector(pval, -1, it);
 119         if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
 120             goto auxerr2;
 121         break;
 122
 123     case ASN1_ITYPE_NDEF_SEQUENCE:
 124     case ASN1_ITYPE_SEQUENCE:
 125         if (asn1_cb) {
 126             i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
 127             if (!i)
 128                 goto auxerr;
 129             if (i == 2) {
 130                 return 1;
 131             }
 132         }
 133         if (embed) {
 134             memset(*pval, 0, it->size);
 135         } else {
 136             *pval = OPENSSL_zalloc(it->size);
 137             if (*pval == NULL)
 138                 goto memerr;
 139         }
 140         /* 0 : init. lock */
 141         if (ossl_asn1_do_lock(pval, 0, it) < 0) {
 142             if (!embed) {
 143                 OPENSSL_free(*pval);
 144                 *pval = NULL;
 145             }
 146             goto memerr;
 147         }
 148         ossl_asn1_enc_init(pval, it);
 149         for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
 150             pseqval = ossl_asn1_get_field_ptr(pval, tt);
 151             if (!asn1_template_new(pseqval, tt, libctx, propq))
 152                 goto memerr2;
 153         }
 154         if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
 155             goto auxerr2;
 156         break;
 157     }
 158     return 1;
 159
 160  memerr2:
 161     ossl_asn1_item_embed_free(pval, it, embed);
 162  memerr:
 163     ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
 164     return 0;
 165
 166  auxerr2:
 167     ossl_asn1_item_embed_free(pval, it, embed);
 168  auxerr:
 169     ERR_raise(ERR_LIB_ASN1, ASN1_R_AUX_ERROR);
 170     return 0;
 171
 172 }
 173
 174 static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
 175 {
 176     const ASN1_EXTERN_FUNCS *ef;
 177
 178     switch (it->itype) {
 179
 180     case ASN1_ITYPE_EXTERN:
 181         ef = it->funcs;
 182         if (ef && ef->asn1_ex_clear)
 183             ef->asn1_ex_clear(pval, it);
 184         else
 185             *pval = NULL;
 186         break;
 187
 188     case ASN1_ITYPE_PRIMITIVE:
 189         if (it->templates)
 190             asn1_template_clear(pval, it->templates);
 191         else
 192             asn1_primitive_clear(pval, it);
 193         break;
 194
 195     case ASN1_ITYPE_MSTRING:
 196         asn1_primitive_clear(pval, it);
 197         break;
 198
 199     case ASN1_ITYPE_CHOICE:
 200     case ASN1_ITYPE_SEQUENCE:
 201     case ASN1_ITYPE_NDEF_SEQUENCE:
 202         *pval = NULL;
 203         break;
 204     }
 205 }
 206
 207 static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,
 208                              OSSL_LIB_CTX *libctx, const char *propq)
 209 {
 210     const ASN1_ITEM *it = ASN1_ITEM_ptr(tt->item);
 211     int embed = tt->flags & ASN1_TFLG_EMBED;
 212     ASN1_VALUE *tval;
 213     int ret;
 214     if (embed) {
 215         tval = (ASN1_VALUE *)pval;
 216         pval = &tval;
 217     }
 218     if (tt->flags & ASN1_TFLG_OPTIONAL) {
 219         asn1_template_clear(pval, tt);
 220         return 1;
 221     }
 222     /* If ANY DEFINED BY nothing to do */
 223
 224     if (tt->flags & ASN1_TFLG_ADB_MASK) {
 225         *pval = NULL;
 226         return 1;
 227     }
 228     /* If SET OF or SEQUENCE OF, its a STACK */
 229     if (tt->flags & ASN1_TFLG_SK_MASK) {
 230         STACK_OF(ASN1_VALUE) *skval;
 231         skval = sk_ASN1_VALUE_new_null();
 232         if (!skval) {
 233             ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
 234             ret = 0;
 235             goto done;
 236         }
 237         *pval = (ASN1_VALUE *)skval;
 238         ret = 1;
 239         goto done;
 240     }
 241     /* Otherwise pass it back to the item routine */
 242     ret = asn1_item_embed_new(pval, it, embed, libctx, propq);
 243  done:
 244     return ret;
 245 }
 246
 247 static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 248 {
 249     /* If ADB or STACK just NULL the field */
 250     if (tt->flags & (ASN1_TFLG_ADB_MASK | ASN1_TFLG_SK_MASK))
 251         *pval = NULL;
 252     else
 253         asn1_item_clear(pval, ASN1_ITEM_ptr(tt->item));
 254 }
 255
 256 /*
 257  * NB: could probably combine most of the real XXX_new() behaviour and junk
 258  * all the old functions.
 259  */
 260
 261 static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
 262                               int embed)
 263 {
 264     ASN1_TYPE *typ;
 265     ASN1_STRING *str;
 266     int utype;
 267
 268     if (!it)
 269         return 0;
 270
 271     if (it->funcs) {
 272         const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
 273         if (embed) {
 274             if (pf->prim_clear) {
 275                 pf->prim_clear(pval, it);
 276                 return 1;
 277             }
 278         } else if (pf->prim_new) {
 279             return pf->prim_new(pval, it);
 280         }
 281     }
 282
 283     if (it->itype == ASN1_ITYPE_MSTRING)
 284         utype = -1;
 285     else
 286         utype = it->utype;
 287     switch (utype) {
 288     case V_ASN1_OBJECT:
 289         *pval = (ASN1_VALUE *)OBJ_nid2obj(NID_undef);
 290         return 1;
 291
 292     case V_ASN1_BOOLEAN:
 293         *(ASN1_BOOLEAN *)pval = it->size;
 294         return 1;
 295
 296     case V_ASN1_NULL:
 297         *pval = (ASN1_VALUE *)1;
 298         return 1;
 299
 300     case V_ASN1_ANY:
 301         if ((typ = OPENSSL_malloc(sizeof(*typ))) == NULL) {
 302             ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
 303             return 0;
 304         }
 305         typ->value.ptr = NULL;
 306         typ->type = -1;
 307         *pval = (ASN1_VALUE *)typ;
 308         break;
 309
 310     default:
 311         if (embed) {
 312             str = *(ASN1_STRING **)pval;
 313             memset(str, 0, sizeof(*str));
 314             str->type = utype;
 315             str->flags = ASN1_STRING_FLAG_EMBED;
 316         } else {
 317             str = ASN1_STRING_type_new(utype);
 318             *pval = (ASN1_VALUE *)str;
 319         }
 320         if (it->itype == ASN1_ITYPE_MSTRING && str)
 321             str->flags |= ASN1_STRING_FLAG_MSTRING;
 322         break;
 323     }
 324     if (*pval)
 325         return 1;
 326     return 0;
 327 }
 328
 329 static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
 330 {
 331     int utype;
 332     if (it && it->funcs) {
 333         const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
 334         if (pf->prim_clear)
 335             pf->prim_clear(pval, it);
 336         else
 337             *pval = NULL;
 338         return;
 339     }
 340     if (!it || (it->itype == ASN1_ITYPE_MSTRING))
 341         utype = -1;
 342     else
 343         utype = it->utype;
 344     if (utype == V_ASN1_BOOLEAN)
 345         *(ASN1_BOOLEAN *)pval = it->size;
 346     else
 347         *pval = NULL;
 348 }