crypto/x509v3/pcy_tree.c

   1 /* pcy_tree.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 2004.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2004 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 #include "cryptlib.h"
  60 #include <openssl/x509.h>
  61 #include <openssl/x509v3.h>
  62
  63 #include "pcy_int.h"
  64
  65 /* Initialize policy tree. Return values:
  66  *  0 Some internal error occured.
  67  * -1 Inconsistent or invalid extensions in certificates.
  68  *  1 Tree initialized OK.
  69  *  2 Policy tree is empty.
  70  *  5 Tree OK and requireExplicitPolicy true.
  71  *  6 Tree empty and requireExplicitPolicy true.
  72  */
  73
  74 static int tree_init(X509_POLICY_TREE **ptree, STACK_OF(X509) *certs,
  75                         unsigned int flags)
  76         {
  77         X509_POLICY_TREE *tree;
  78         X509_POLICY_LEVEL *level;
  79         const X509_POLICY_CACHE *cache;
  80         X509_POLICY_DATA *data = NULL;
  81         X509 *x;
  82         int ret = 1;
  83         int i, n;
  84         int explicit_policy;
  85         int any_skip;
  86         int map_skip;
  87         *ptree = NULL;
  88         n = sk_X509_num(certs);
  89
  90         /* Disable policy mapping for now... */
  91         flags |= X509_V_FLAG_INHIBIT_MAP;
  92
  93         if (flags & X509_V_FLAG_EXPLICIT_POLICY)
  94                 explicit_policy = 0;
  95         else
  96                 explicit_policy = n + 1;
  97
  98         if (flags & X509_V_FLAG_INHIBIT_ANY)
  99                 any_skip = 0;
 100         else
 101                 any_skip = n + 1;
 102
 103         if (flags & X509_V_FLAG_INHIBIT_MAP)
 104                 map_skip = 0;
 105         else
 106                 map_skip = n + 1;
 107
 108         /* Can't do anything with just a trust anchor */
 109         if (n == 1)
 110                 return 1;
 111         /* First setup policy cache in all certificates apart from the
 112          * trust anchor. Note any bad cache results on the way. Also can
 113          * calculate explicit_policy value at this point.
 114          */
 115         for (i = n - 2; i >= 0; i--)
 116                 {
 117                 x = sk_X509_value(certs, i);
 118                 X509_check_purpose(x, -1, -1);
 119                 cache = policy_cache_set(x);
 120                 /* If cache NULL something bad happened: return immediately */
 121                 if (cache == NULL)
 122                         return 0;
 123                 /* If inconsistent extensions keep a note of it but continue */
 124                 if (x->ex_flags & EXFLAG_INVALID_POLICY)
 125                         ret = -1;
 126                 /* Otherwise if we have no data (hence no CertificatePolicies)
 127                  * and haven't already set an inconsistent code note it.
 128                  */
 129                 else if ((ret == 1) && !cache->data)
 130                         ret = 2;
 131                 if (explicit_policy > 0)
 132                         {
 133                         explicit_policy--;
 134                         if (!(x->ex_flags & EXFLAG_SS)
 135                                 && (cache->explicit_skip != -1)
 136                                 && (cache->explicit_skip < explicit_policy))
 137                                 explicit_policy = cache->explicit_skip;
 138                         }
 139                 }
 140
 141         if (ret != 1)
 142                 {
 143                 if (ret == 2 && !explicit_policy)
 144                         return 6;
 145                 return ret;
 146                 }
 147
 148
 149         /* If we get this far initialize the tree */
 150
 151         tree = OPENSSL_malloc(sizeof(X509_POLICY_TREE));
 152
 153         if (!tree)
 154                 return 0;
 155
 156         tree->flags = 0;
 157         tree->levels = OPENSSL_malloc(sizeof(X509_POLICY_LEVEL) * n);
 158         tree->nlevel = 0;
 159         tree->extra_data = NULL;
 160         tree->auth_policies = NULL;
 161         tree->user_policies = NULL;
 162
 163         if (!tree)
 164                 {
 165                 OPENSSL_free(tree);
 166                 return 0;
 167                 }
 168
 169         memset(tree->levels, 0, n * sizeof(X509_POLICY_LEVEL));
 170
 171         tree->nlevel = n;
 172
 173         level = tree->levels;
 174
 175         /* Root data: initialize to anyPolicy */
 176
 177         data = policy_data_new(NULL, OBJ_nid2obj(NID_any_policy), 0);
 178
 179         if (!data || !level_add_node(level, data, NULL, tree))
 180                 goto bad_tree;
 181
 182         for (i = n - 2; i >= 0; i--)
 183                 {
 184                 level++;
 185                 x = sk_X509_value(certs, i);
 186                 cache = policy_cache_set(x);
 187
 188                 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
 189                 level->cert = x;
 190
 191                 if (!cache->anyPolicy)
 192                                 level->flags |= X509_V_FLAG_INHIBIT_ANY;
 193
 194                 /* Determine inhibit any and inhibit map flags */
 195                 if (any_skip == 0)
 196                         {
 197                         /* Any matching allowed if certificate is self
 198                          * issued and not the last in the chain.
 199                          */
 200                         if (!(x->ex_flags & EXFLAG_SS) || (i == 0))
 201                                 level->flags |= X509_V_FLAG_INHIBIT_ANY;
 202                         }
 203                 else
 204                         {
 205                         any_skip--;
 206                         if ((cache->any_skip > 0)
 207                                 && (cache->any_skip < any_skip))
 208                                 any_skip = cache->any_skip;
 209                         }
 210
 211                 if (map_skip == 0)
 212                         level->flags |= X509_V_FLAG_INHIBIT_MAP;
 213                 else
 214                         {
 215                         map_skip--;
 216                         if ((cache->map_skip > 0)
 217                                 && (cache->map_skip < map_skip))
 218                                 map_skip = cache->map_skip;
 219                         }
 220
 221
 222                 }
 223
 224         *ptree = tree;
 225
 226         if (explicit_policy)
 227                 return 1;
 228         else
 229                 return 5;
 230
 231         bad_tree:
 232
 233         X509_policy_tree_free(tree);
 234
 235         return 0;
 236
 237         }
 238
 239 /* This corresponds to RFC3280 XXXX XXXXX:
 240  * link any data from CertificatePolicies onto matching parent
 241  * or anyPolicy if no match.
 242  */
 243
 244 static int tree_link_nodes(X509_POLICY_LEVEL *curr,
 245                                 const X509_POLICY_CACHE *cache)
 246         {
 247         int i;
 248         X509_POLICY_LEVEL *last;
 249         X509_POLICY_DATA *data;
 250         X509_POLICY_NODE *parent;
 251         last = curr - 1;
 252         for (i = 0; i < sk_X509_POLICY_DATA_num(cache->data); i++)
 253                 {
 254                 data = sk_X509_POLICY_DATA_value(cache->data, i);
 255                 /* If a node is mapped any it doesn't have a corresponding
 256                  * CertificatePolicies entry.
 257                  * However such an identical node would be created
 258                  * if anyPolicy matching is enabled because there would be
 259                  * no match with the parent valid_policy_set. So we create
 260                  * link because then it will have the mapping flags
 261                  * right and we can prune it later.
 262                  */
 263                 if ((data->flags & POLICY_DATA_FLAG_MAPPED_ANY)
 264                         && !(curr->flags & X509_V_FLAG_INHIBIT_ANY))
 265                         continue;
 266                 /* Look for matching node in parent */
 267                 parent = level_find_node(last, data->valid_policy);
 268                 /* If no match link to anyPolicy */
 269                 if (!parent)
 270                         parent = last->anyPolicy;
 271                 if (parent && !level_add_node(curr, data, parent, NULL))
 272                                 return 0;
 273                 }
 274         return 1;
 275         }
 276
 277 /* This corresponds to RFC3280 XXXX XXXXX:
 278  * Create new data for any unmatched policies in the parent and link
 279  * to anyPolicy.
 280  */
 281
 282 static int tree_link_any(X509_POLICY_LEVEL *curr,
 283                         const X509_POLICY_CACHE *cache,
 284                         X509_POLICY_TREE *tree)
 285         {
 286         int i;
 287         X509_POLICY_DATA *data;
 288         X509_POLICY_NODE *node;
 289         X509_POLICY_LEVEL *last;
 290
 291         last = curr - 1;
 292
 293         for (i = 0; i < sk_X509_POLICY_NODE_num(last->nodes); i++)
 294                 {
 295                 node = sk_X509_POLICY_NODE_value(last->nodes, i);
 296
 297                 /* Skip any node with any children: we only want unmathced
 298                  * nodes.
 299                  *
 300                  * Note: need something better for policy mapping
 301                  * because each node may have multiple children
 302                  */
 303                 if (node->nchild)
 304                         continue;
 305                 /* Create a new node with qualifiers from anyPolicy and
 306                  * id from unmatched node.
 307                  */
 308                 data = policy_data_new(NULL, node->data->valid_policy,
 309                                                 node_critical(node));
 310
 311                 if (data == NULL)
 312                         return 0;
 313                 data->qualifier_set = curr->anyPolicy->data->qualifier_set;
 314                 data->flags |= POLICY_DATA_FLAG_SHARED_QUALIFIERS;
 315                 if (!level_add_node(curr, data, node, tree))
 316                         {
 317                         policy_data_free(data);
 318                         return 0;
 319                         }
 320                 }
 321         /* Finally add link to anyPolicy */
 322         if (last->anyPolicy)
 323                 {
 324                 if (!level_add_node(curr, cache->anyPolicy,
 325                                                 last->anyPolicy, NULL))
 326                         return 0;
 327                 }
 328         return 1;
 329         }
 330
 331 /* Prune the tree: delete any child mapped child data on the current level
 332  * then proceed up the tree deleting any data with no children. If we ever
 333  * have no data on a level we can halt because the tree will be empty.
 334  */
 335
 336 static int tree_prune(X509_POLICY_TREE *tree, X509_POLICY_LEVEL *curr)
 337         {
 338         X509_POLICY_NODE *node;
 339         int i;
 340         for (i = sk_X509_POLICY_NODE_num(curr->nodes) - 1; i >= 0; i--)
 341                 {
 342                 node = sk_X509_POLICY_NODE_value(curr->nodes, i);
 343                 /* Delete any mapped data: see RFC3280 XXXX */
 344                 if (node->data->flags & POLICY_DATA_FLAG_MAP_MASK)
 345                         {
 346                         node->parent->nchild--;
 347                         OPENSSL_free(node);
 348                         sk_X509_POLICY_NODE_delete(curr->nodes, i);
 349                         }
 350                 }
 351
 352         for(;;) {
 353                 --curr;
 354                 for (i = sk_X509_POLICY_NODE_num(curr->nodes) - 1; i >= 0; i--)
 355                         {
 356                         node = sk_X509_POLICY_NODE_value(curr->nodes, i);
 357                         if (node->nchild == 0)
 358                                 {
 359                                 node->parent->nchild--;
 360                                 OPENSSL_free(node);
 361                                 sk_X509_POLICY_NODE_delete(curr->nodes, i);
 362                                 }
 363                         }
 364                 if (curr->anyPolicy && !curr->anyPolicy->nchild)
 365                         {
 366                         if (curr->anyPolicy->parent)
 367                                 curr->anyPolicy->parent->nchild--;
 368                         OPENSSL_free(curr->anyPolicy);
 369                         curr->anyPolicy = NULL;
 370                         }
 371                 if (curr == tree->levels)
 372                         {
 373                         /* If we zapped anyPolicy at top then tree is empty */
 374                         if (!curr->anyPolicy)
 375                                         return 2;
 376                         return 1;
 377                         }
 378                 }
 379
 380         return 1;
 381
 382         }
 383
 384 static int tree_add_auth_node(STACK_OF(X509_POLICY_NODE) **pnodes,
 385                                                  X509_POLICY_NODE *pcy)
 386         {
 387         if (!*pnodes)
 388                 {
 389                 *pnodes = policy_node_cmp_new();
 390                 if (!*pnodes)
 391                         return 0;
 392                 }
 393         else if (sk_X509_POLICY_NODE_find(*pnodes, pcy) != -1)
 394                 return 1;
 395
 396         if (!sk_X509_POLICY_NODE_push(*pnodes, pcy))
 397                 return 0;
 398
 399         return 1;
 400
 401         }
 402
 403 /* Calculate the authority set based on policy tree.
 404  * The 'pnodes' parameter is used as a store for the set of policy nodes
 405  * used to calculate the user set. If the authority set is not anyPolicy
 406  * then pnodes will just point to the authority set. If however the authority
 407  * set is anyPolicy then the set of valid policies (other than anyPolicy)
 408  * is store in pnodes. The return value of '2' is used in this case to indicate
 409  * that pnodes should be freed.
 410  */
 411
 412 static int tree_calculate_authority_set(X509_POLICY_TREE *tree,
 413                                         STACK_OF(X509_POLICY_NODE) **pnodes)
 414         {
 415         X509_POLICY_LEVEL *curr;
 416         X509_POLICY_NODE *node, *anyptr;
 417         STACK_OF(X509_POLICY_NODE) **addnodes;
 418         int i, j;
 419         curr = tree->levels + tree->nlevel - 1;
 420
 421         /* If last level contains anyPolicy set is anyPolicy */
 422         if (curr->anyPolicy)
 423                 {
 424                 if (!tree_add_auth_node(&tree->auth_policies, curr->anyPolicy))
 425                         return 0;
 426                 addnodes = pnodes;
 427                 }
 428         else
 429                 /* Add policies to authority set */
 430                 addnodes = &tree->auth_policies;
 431
 432         curr = tree->levels;
 433         for (i = 1; i < tree->nlevel; i++)
 434                 {
 435                 /* If no anyPolicy node on this this level it can't
 436                  * appear on lower levels so end search.
 437                  */
 438                 if (!(anyptr = curr->anyPolicy))
 439                         break;
 440                 curr++;
 441                 for (j = 0; j < sk_X509_POLICY_NODE_num(curr->nodes); j++)
 442                         {
 443                         node = sk_X509_POLICY_NODE_value(curr->nodes, j);
 444                         if ((node->parent == anyptr)
 445                                 && !tree_add_auth_node(addnodes, node))
 446                                         return 0;
 447                         }
 448                 }
 449
 450         if (addnodes == pnodes)
 451                 return 2;
 452
 453         *pnodes = tree->auth_policies;
 454
 455         return 1;
 456         }
 457
 458 static int tree_calculate_user_set(X509_POLICY_TREE *tree,
 459                                 STACK_OF(ASN1_OBJECT) *policy_oids,
 460                                 STACK_OF(X509_POLICY_NODE) *auth_nodes)
 461         {
 462         int i;
 463         X509_POLICY_NODE *node;
 464         ASN1_OBJECT *oid;
 465
 466         X509_POLICY_NODE *anyPolicy;
 467         X509_POLICY_DATA *extra;
 468
 469         /* Check if anyPolicy present in authority constrained policy set:
 470          * this will happen if it is a leaf node.
 471          */
 472
 473         if (sk_ASN1_OBJECT_num(policy_oids) <= 0)
 474                 return 1;
 475
 476         anyPolicy = tree->levels[tree->nlevel - 1].anyPolicy;
 477
 478         for (i = 0; i < sk_ASN1_OBJECT_num(policy_oids); i++)
 479                 {
 480                 oid = sk_ASN1_OBJECT_value(policy_oids, i);
 481                 if (OBJ_obj2nid(oid) == NID_any_policy)
 482                         {
 483                         tree->flags |= POLICY_FLAG_ANY_POLICY;
 484                         return 1;
 485                         }
 486                 }
 487
 488         for (i = 0; i < sk_ASN1_OBJECT_num(policy_oids); i++)
 489                 {
 490                 oid = sk_ASN1_OBJECT_value(policy_oids, i);
 491                 node = tree_find_sk(auth_nodes, oid);
 492                 if (!node)
 493                         {
 494                         if (!anyPolicy)
 495                                 continue;
 496                         /* Create a new node with policy ID from user set
 497                          * and qualifiers from anyPolicy.
 498                          */
 499                         extra = policy_data_new(NULL, oid,
 500                                                 node_critical(anyPolicy));
 501                         if (!extra)
 502                                 return 0;
 503                         extra->qualifier_set = anyPolicy->data->qualifier_set;
 504                         extra->flags = POLICY_DATA_FLAG_SHARED_QUALIFIERS
 505                                                 | POLICY_DATA_FLAG_EXTRA_NODE;
 506                         node = level_add_node(NULL, extra, anyPolicy->parent,
 507                                                 tree);
 508                         }
 509                 if (!tree->user_policies)
 510                         {
 511                         tree->user_policies = sk_X509_POLICY_NODE_new_null();
 512                         if (!tree->user_policies)
 513                                 return 1;
 514                         }
 515                 if (!sk_X509_POLICY_NODE_push(tree->user_policies, node))
 516                         return 0;
 517                 }
 518         return 1;
 519
 520         }
 521
 522 static int tree_evaluate(X509_POLICY_TREE *tree)
 523         {
 524         int ret, i;
 525         X509_POLICY_LEVEL *curr = tree->levels + 1;
 526         const X509_POLICY_CACHE *cache;
 527
 528         for(i = 1; i < tree->nlevel; i++, curr++)
 529                 {
 530                 cache = policy_cache_set(curr->cert);
 531                 if (!tree_link_nodes(curr, cache))
 532                         return 0;
 533
 534                 if (!(curr->flags & X509_V_FLAG_INHIBIT_ANY)
 535                         && !tree_link_any(curr, cache, tree))
 536                         return 0;
 537                 ret = tree_prune(tree, curr);
 538                 if (ret != 1)
 539                         return ret;
 540                 }
 541
 542         return 1;
 543
 544         }
 545
 546 static void exnode_free(X509_POLICY_NODE *node)
 547         {
 548         if (node->data && (node->data->flags & POLICY_DATA_FLAG_EXTRA_NODE))
 549                 OPENSSL_free(node);
 550         }
 551
 552
 553 void X509_policy_tree_free(X509_POLICY_TREE *tree)
 554         {
 555         X509_POLICY_LEVEL *curr;
 556         int i;
 557
 558         if (!tree)
 559                 return;
 560
 561         sk_X509_POLICY_NODE_free(tree->auth_policies);
 562         sk_X509_POLICY_NODE_pop_free(tree->user_policies, exnode_free);
 563
 564         for(i = 0, curr = tree->levels; i < tree->nlevel; i++, curr++)
 565                 {
 566                 if (curr->cert)
 567                         X509_free(curr->cert);
 568                 if (curr->nodes)
 569                         sk_X509_POLICY_NODE_pop_free(curr->nodes,
 570                                                 policy_node_free);
 571                 if (curr->anyPolicy)
 572                         policy_node_free(curr->anyPolicy);
 573                 }
 574
 575         if (tree->extra_data)
 576                 sk_X509_POLICY_DATA_pop_free(tree->extra_data,
 577                                                 policy_data_free);
 578
 579         OPENSSL_free(tree->levels);
 580         OPENSSL_free(tree);
 581
 582         }
 583
 584 /* Application policy checking function.
 585  * Return codes:
 586  *  0   Internal Error.
 587  *  1   Successful.
 588  * -1   One or more certificates contain invalid or inconsistent extensions
 589  * -2   User constrained policy set empty and requireExplicit true.
 590  */
 591
 592 int X509_policy_check(X509_POLICY_TREE **ptree, int *pexplicit_policy,
 593                         STACK_OF(X509) *certs,
 594                         STACK_OF(ASN1_OBJECT) *policy_oids,
 595                         unsigned int flags)
 596         {
 597         int ret;
 598         X509_POLICY_TREE *tree = NULL;
 599         STACK_OF(X509_POLICY_NODE) *nodes, *auth_nodes = NULL;
 600         *ptree = NULL;
 601
 602         *pexplicit_policy = 0;
 603         ret = tree_init(&tree, certs, flags);
 604
 605
 606         switch (ret)
 607                 {
 608
 609                 /* Tree empty requireExplicit False: OK */
 610                 case 2:
 611                 return 1;
 612
 613                 /* Some internal error */
 614                 case 0:
 615                 return 0;
 616
 617                 /* Tree empty requireExplicit True: Error */
 618
 619                 case 6:
 620                 *pexplicit_policy = 1;
 621                 return -2;
 622
 623                 /* Tree OK requireExplicit True: OK and continue */
 624                 case 5:
 625                 *pexplicit_policy = 1;
 626                 break;
 627
 628                 /* Tree OK: continue */
 629
 630                 case 1:
 631                 if (!tree)
 632                         /*
 633                          * tree_init() returns success and a null tree
 634                          * if it's just looking at a trust anchor.
 635                          * I'm not sure that returning success here is
 636                          * correct, but I'm sure that reporting this
 637                          * as an internal error which our caller
 638                          * interprets as a malloc failure is wrong.
 639                          */
 640                         return 1;
 641                 break;
 642                 }
 643
 644         if (!tree) goto error;
 645         ret = tree_evaluate(tree);
 646
 647         if (ret <= 0)
 648                 goto error;
 649
 650         /* Return value 2 means tree empty */
 651         if (ret == 2)
 652                 {
 653                 X509_policy_tree_free(tree);
 654                 if (*pexplicit_policy)
 655                         return -2;
 656                 else
 657                         return 1;
 658                 }
 659
 660         /* Tree is not empty: continue */
 661
 662         ret = tree_calculate_authority_set(tree, &auth_nodes);
 663
 664         if (!ret)
 665                 goto error;
 666
 667         if (!tree_calculate_user_set(tree, policy_oids, auth_nodes))
 668                 goto error;
 669
 670         if (ret == 2)
 671                 sk_X509_POLICY_NODE_free(auth_nodes);
 672
 673         if (tree)
 674                 *ptree = tree;
 675
 676         if (*pexplicit_policy)
 677                 {
 678                 nodes = X509_policy_tree_get0_user_policies(tree);
 679                 if (sk_X509_POLICY_NODE_num(nodes) <= 0)
 680                         return -2;
 681                 }
 682
 683         return 1;
 684
 685         error:
 686
 687         X509_policy_tree_free(tree);
 688
 689         return 0;
 690
 691         }
 692