1/*
2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
3 * 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 <string.h>
60
61#include <openssl/mem.h>
62#include <openssl/obj.h>
63#include <openssl/stack.h>
64#include <openssl/thread.h>
65#include <openssl/x509.h>
66#include <openssl/x509v3.h>
67
68#include "pcy_int.h"
69#include "../internal.h"
70
71/*
72 * Enable this to print out the complete policy tree at various point during
73 * evaluation.
74 */
75
76/*
77 * #define OPENSSL_POLICY_DEBUG
78 */
79
80#ifdef OPENSSL_POLICY_DEBUG
81
82static void expected_print(BIO *err, X509_POLICY_LEVEL *lev,
83 X509_POLICY_NODE *node, int indent)
84{
85 if ((lev->flags & X509_V_FLAG_INHIBIT_MAP)
86 || !(node->data->flags & POLICY_DATA_FLAG_MAP_MASK))
87 BIO_puts(err, " Not Mapped\n");
88 else {
89 int i;
90 STACK_OF(ASN1_OBJECT) *pset = node->data->expected_policy_set;
91 ASN1_OBJECT *oid;
92 BIO_puts(err, " Expected: ");
93 for (i = 0; i < sk_ASN1_OBJECT_num(pset); i++) {
94 oid = sk_ASN1_OBJECT_value(pset, i);
95 if (i)
96 BIO_puts(err, ", ");
97 i2a_ASN1_OBJECT(err, oid);
98 }
99 BIO_puts(err, "\n");
100 }
101}
102
103static void tree_print(char *str, X509_POLICY_TREE *tree,
104 X509_POLICY_LEVEL *curr)
105{
106 X509_POLICY_LEVEL *plev;
107 X509_POLICY_NODE *node;
108 int i;
109 BIO *err;
110 err = BIO_new_fp(stderr, BIO_NOCLOSE);
111 if (!curr)
112 curr = tree->levels + tree->nlevel;
113 else
114 curr++;
115 BIO_printf(err, "Level print after %s\n", str);
116 BIO_printf(err, "Printing Up to Level %ld\n", curr - tree->levels);
117 for (plev = tree->levels; plev != curr; plev++) {
118 BIO_printf(err, "Level %ld, flags = %x\n",
119 plev - tree->levels, plev->flags);
120 for (i = 0; i < sk_X509_POLICY_NODE_num(plev->nodes); i++) {
121 node = sk_X509_POLICY_NODE_value(plev->nodes, i);
122 X509_POLICY_NODE_print(err, node, 2);
123 expected_print(err, plev, node, 2);
124 BIO_printf(err, " Flags: %x\n", node->data->flags);
125 }
126 if (plev->anyPolicy)
127 X509_POLICY_NODE_print(err, plev->anyPolicy, 2);
128 }
129
130 BIO_free(err);
131
132}
133#else
134
135# define tree_print(a,b,c) /* */
136
137#endif
138
139/*-
140 * Initialize policy tree. Return values:
141 * 0 Some internal error occurred.
142 * -1 Inconsistent or invalid extensions in certificates.
143 * 1 Tree initialized OK.
144 * 2 Policy tree is empty.
145 * 5 Tree OK and requireExplicitPolicy true.
146 * 6 Tree empty and requireExplicitPolicy true.
147 */
148
149static int tree_init(X509_POLICY_TREE **ptree, STACK_OF(X509) *certs,
150 unsigned int flags)
151{
152 X509_POLICY_TREE *tree;
153 X509_POLICY_LEVEL *level;
154 const X509_POLICY_CACHE *cache;
155 X509_POLICY_DATA *data = NULL;
156 X509 *x;
157 int ret = 1;
158 int i, n;
159 int explicit_policy;
160 int any_skip;
161 int map_skip;
162 *ptree = NULL;
163 n = sk_X509_num(certs);
164
165#if 0
166 /* Disable policy mapping for now... */
167 flags |= X509_V_FLAG_INHIBIT_MAP;
168#endif
169
170 if (flags & X509_V_FLAG_EXPLICIT_POLICY)
171 explicit_policy = 0;
172 else
173 explicit_policy = n + 1;
174
175 if (flags & X509_V_FLAG_INHIBIT_ANY)
176 any_skip = 0;
177 else
178 any_skip = n + 1;
179
180 if (flags & X509_V_FLAG_INHIBIT_MAP)
181 map_skip = 0;
182 else
183 map_skip = n + 1;
184
185 /* Can't do anything with just a trust anchor */
186 if (n == 1)
187 return 1;
188 /*
189 * First setup policy cache in all certificates apart from the trust
190 * anchor. Note any bad cache results on the way. Also can calculate
191 * explicit_policy value at this point.
192 */
193 for (i = n - 2; i >= 0; i--) {
194 x = sk_X509_value(certs, i);
195 X509_check_purpose(x, -1, -1);
196 cache = policy_cache_set(x);
197 /* If cache NULL something bad happened: return immediately */
198 if (cache == NULL)
199 return 0;
200 /*
201 * If inconsistent extensions keep a note of it but continue
202 */
203 if (x->ex_flags & EXFLAG_INVALID_POLICY)
204 ret = -1;
205 /*
206 * Otherwise if we have no data (hence no CertificatePolicies) and
207 * haven't already set an inconsistent code note it.
208 */
209 else if ((ret == 1) && !cache->data)
210 ret = 2;
211 if (explicit_policy > 0) {
212 if (!(x->ex_flags & EXFLAG_SI))
213 explicit_policy--;
214 if ((cache->explicit_skip != -1)
215 && (cache->explicit_skip < explicit_policy))
216 explicit_policy = cache->explicit_skip;
217 }
218 }
219
220 if (ret != 1) {
221 if (ret == 2 && !explicit_policy)
222 return 6;
223 return ret;
224 }
225
226 /* If we get this far initialize the tree */
227
228 tree = OPENSSL_malloc(sizeof(X509_POLICY_TREE));
229
230 if (!tree)
231 return 0;
232
233 tree->flags = 0;
234 tree->levels = OPENSSL_malloc(sizeof(X509_POLICY_LEVEL) * n);
235 tree->nlevel = 0;
236 tree->extra_data = NULL;
237 tree->auth_policies = NULL;
238 tree->user_policies = NULL;
239
240 if (!tree->levels) {
241 OPENSSL_free(tree);
242 return 0;
243 }
244
245 OPENSSL_memset(tree->levels, 0, n * sizeof(X509_POLICY_LEVEL));
246
247 tree->nlevel = n;
248
249 level = tree->levels;
250
251 /* Root data: initialize to anyPolicy */
252
253 data = policy_data_new(NULL, OBJ_nid2obj(NID_any_policy), 0);
254
255 if (!data || !level_add_node(level, data, NULL, tree))
256 goto bad_tree;
257
258 for (i = n - 2; i >= 0; i--) {
259 level++;
260 x = sk_X509_value(certs, i);
261 cache = policy_cache_set(x);
262 X509_up_ref(x);
263 level->cert = x;
264
265 if (!cache->anyPolicy)
266 level->flags |= X509_V_FLAG_INHIBIT_ANY;
267
268 /* Determine inhibit any and inhibit map flags */
269 if (any_skip == 0) {
270 /*
271 * Any matching allowed if certificate is self issued and not the
272 * last in the chain.
273 */
274 if (!(x->ex_flags & EXFLAG_SI) || (i == 0))
275 level->flags |= X509_V_FLAG_INHIBIT_ANY;
276 } else {
277 if (!(x->ex_flags & EXFLAG_SI))
278 any_skip--;
279 if ((cache->any_skip >= 0)
280 && (cache->any_skip < any_skip))
281 any_skip = cache->any_skip;
282 }
283
284 if (map_skip == 0)
285 level->flags |= X509_V_FLAG_INHIBIT_MAP;
286 else {
287 if (!(x->ex_flags & EXFLAG_SI))
288 map_skip--;
289 if ((cache->map_skip >= 0)
290 && (cache->map_skip < map_skip))
291 map_skip = cache->map_skip;
292 }
293
294 }
295
296 *ptree = tree;
297
298 if (explicit_policy)
299 return 1;
300 else
301 return 5;
302
303 bad_tree:
304
305 X509_policy_tree_free(tree);
306
307 return 0;
308
309}
310
311static int tree_link_matching_nodes(X509_POLICY_LEVEL *curr,
312 X509_POLICY_DATA *data)
313{
314 X509_POLICY_LEVEL *last = curr - 1;
315 X509_POLICY_NODE *node;
316 int matched = 0;
317 size_t i;
318 /* Iterate through all in nodes linking matches */
319 for (i = 0; i < sk_X509_POLICY_NODE_num(last->nodes); i++) {
320 node = sk_X509_POLICY_NODE_value(last->nodes, i);
321 if (policy_node_match(last, node, data->valid_policy)) {
322 if (!level_add_node(curr, data, node, NULL))
323 return 0;
324 matched = 1;
325 }
326 }
327 if (!matched && last->anyPolicy) {
328 if (!level_add_node(curr, data, last->anyPolicy, NULL))
329 return 0;
330 }
331 return 1;
332}
333
334/*
335 * This corresponds to RFC3280 6.1.3(d)(1): link any data from
336 * CertificatePolicies onto matching parent or anyPolicy if no match.
337 */
338
339static int tree_link_nodes(X509_POLICY_LEVEL *curr,
340 const X509_POLICY_CACHE *cache)
341{
342 size_t i;
343 X509_POLICY_DATA *data;
344
345 for (i = 0; i < sk_X509_POLICY_DATA_num(cache->data); i++) {
346 data = sk_X509_POLICY_DATA_value(cache->data, i);
347 /*
348 * If a node is mapped any it doesn't have a corresponding
349 * CertificatePolicies entry. However such an identical node would
350 * be created if anyPolicy matching is enabled because there would be
351 * no match with the parent valid_policy_set. So we create link
352 * because then it will have the mapping flags right and we can prune
353 * it later.
354 */
355#if 0
356 if ((data->flags & POLICY_DATA_FLAG_MAPPED_ANY)
357 && !(curr->flags & X509_V_FLAG_INHIBIT_ANY))
358 continue;
359#endif
360 /* Look for matching nodes in previous level */
361 if (!tree_link_matching_nodes(curr, data))
362 return 0;
363 }
364 return 1;
365}
366
367/*
368 * This corresponds to RFC3280 6.1.3(d)(2): Create new data for any unmatched
369 * policies in the parent and link to anyPolicy.
370 */
371
372static int tree_add_unmatched(X509_POLICY_LEVEL *curr,
373 const X509_POLICY_CACHE *cache,
374 const ASN1_OBJECT *id,
375 X509_POLICY_NODE *node, X509_POLICY_TREE *tree)
376{
377 X509_POLICY_DATA *data;
378 if (id == NULL)
379 id = node->data->valid_policy;
380 /*
381 * Create a new node with qualifiers from anyPolicy and id from unmatched
382 * node.
383 */
384 data = policy_data_new(NULL, id, node_critical(node));
385
386 if (data == NULL)
387 return 0;
388 /* Curr may not have anyPolicy */
389 data->qualifier_set = cache->anyPolicy->qualifier_set;
390 data->flags |= POLICY_DATA_FLAG_SHARED_QUALIFIERS;
391 if (!level_add_node(curr, data, node, tree)) {
392 policy_data_free(data);
393 return 0;
394 }
395
396 return 1;
397}
398
399static int tree_link_unmatched(X509_POLICY_LEVEL *curr,
400 const X509_POLICY_CACHE *cache,
401 X509_POLICY_NODE *node, X509_POLICY_TREE *tree)
402{
403 const X509_POLICY_LEVEL *last = curr - 1;
404 size_t i;
405
406 if ((last->flags & X509_V_FLAG_INHIBIT_MAP)
407 || !(node->data->flags & POLICY_DATA_FLAG_MAPPED)) {
408 /* If no policy mapping: matched if one child present */
409 if (node->nchild)
410 return 1;
411 if (!tree_add_unmatched(curr, cache, NULL, node, tree))
412 return 0;
413 /* Add it */
414 } else {
415 /* If mapping: matched if one child per expected policy set */
416 STACK_OF(ASN1_OBJECT) *expset = node->data->expected_policy_set;
417 if ((size_t)node->nchild == sk_ASN1_OBJECT_num(expset))
418 return 1;
419 /* Locate unmatched nodes */
420 for (i = 0; i < sk_ASN1_OBJECT_num(expset); i++) {
421 ASN1_OBJECT *oid = sk_ASN1_OBJECT_value(expset, i);
422 if (level_find_node(curr, node, oid))
423 continue;
424 if (!tree_add_unmatched(curr, cache, oid, node, tree))
425 return 0;
426 }
427
428 }
429
430 return 1;
431
432}
433
434static int tree_link_any(X509_POLICY_LEVEL *curr,
435 const X509_POLICY_CACHE *cache,
436 X509_POLICY_TREE *tree)
437{
438 size_t i;
439 /*
440 * X509_POLICY_DATA *data;
441 */
442 X509_POLICY_NODE *node;
443 X509_POLICY_LEVEL *last = curr - 1;
444
445 for (i = 0; i < sk_X509_POLICY_NODE_num(last->nodes); i++) {
446 node = sk_X509_POLICY_NODE_value(last->nodes, i);
447
448 if (!tree_link_unmatched(curr, cache, node, tree))
449 return 0;
450
451#if 0
452
453 /*
454 * Skip any node with any children: we only want unmathced nodes.
455 * Note: need something better for policy mapping because each node
456 * may have multiple children
457 */
458 if (node->nchild)
459 continue;
460
461 /*
462 * Create a new node with qualifiers from anyPolicy and id from
463 * unmatched node.
464 */
465 data = policy_data_new(NULL, node->data->valid_policy,
466 node_critical(node));
467
468 if (data == NULL)
469 return 0;
470 /* Curr may not have anyPolicy */
471 data->qualifier_set = cache->anyPolicy->qualifier_set;
472 data->flags |= POLICY_DATA_FLAG_SHARED_QUALIFIERS;
473 if (!level_add_node(curr, data, node, tree)) {
474 policy_data_free(data);
475 return 0;
476 }
477#endif
478
479 }
480 /* Finally add link to anyPolicy */
481 if (last->anyPolicy) {
482 if (!level_add_node(curr, cache->anyPolicy, last->anyPolicy, NULL))
483 return 0;
484 }
485 return 1;
486}
487
488/*
489 * Prune the tree: delete any child mapped child data on the current level
490 * then proceed up the tree deleting any data with no children. If we ever
491 * have no data on a level we can halt because the tree will be empty.
492 */
493
494static int tree_prune(X509_POLICY_TREE *tree, X509_POLICY_LEVEL *curr)
495{
496 STACK_OF(X509_POLICY_NODE) *nodes;
497 X509_POLICY_NODE *node;
498 int i;
499 nodes = curr->nodes;
500 if (curr->flags & X509_V_FLAG_INHIBIT_MAP) {
501 for (i = sk_X509_POLICY_NODE_num(nodes) - 1; i >= 0; i--) {
502 node = sk_X509_POLICY_NODE_value(nodes, i);
503 /* Delete any mapped data: see RFC3280 XXXX */
504 if (node->data->flags & POLICY_DATA_FLAG_MAP_MASK) {
505 node->parent->nchild--;
506 OPENSSL_free(node);
507 (void)sk_X509_POLICY_NODE_delete(nodes, i);
508 }
509 }
510 }
511
512 for (;;) {
513 --curr;
514 nodes = curr->nodes;
515 for (i = sk_X509_POLICY_NODE_num(nodes) - 1; i >= 0; i--) {
516 node = sk_X509_POLICY_NODE_value(nodes, i);
517 if (node->nchild == 0) {
518 node->parent->nchild--;
519 OPENSSL_free(node);
520 (void)sk_X509_POLICY_NODE_delete(nodes, i);
521 }
522 }
523 if (curr->anyPolicy && !curr->anyPolicy->nchild) {
524 if (curr->anyPolicy->parent)
525 curr->anyPolicy->parent->nchild--;
526 OPENSSL_free(curr->anyPolicy);
527 curr->anyPolicy = NULL;
528 }
529 if (curr == tree->levels) {
530 /* If we zapped anyPolicy at top then tree is empty */
531 if (!curr->anyPolicy)
532 return 2;
533 return 1;
534 }
535 }
536
537}
538
539static int tree_add_auth_node(STACK_OF(X509_POLICY_NODE) **pnodes,
540 X509_POLICY_NODE *pcy)
541{
542 if (!*pnodes) {
543 *pnodes = policy_node_cmp_new();
544 if (!*pnodes)
545 return 0;
546 } else {
547 sk_X509_POLICY_NODE_sort(*pnodes);
548 if (sk_X509_POLICY_NODE_find(*pnodes, NULL, pcy))
549 return 1;
550 }
551 if (!sk_X509_POLICY_NODE_push(*pnodes, pcy))
552 return 0;
553
554 return 1;
555
556}
557
558/*
559 * Calculate the authority set based on policy tree. The 'pnodes' parameter
560 * is used as a store for the set of policy nodes used to calculate the user
561 * set. If the authority set is not anyPolicy then pnodes will just point to
562 * the authority set. If however the authority set is anyPolicy then the set
563 * of valid policies (other than anyPolicy) is store in pnodes. The return
564 * value of '2' is used in this case to indicate that pnodes should be freed.
565 */
566
567static int tree_calculate_authority_set(X509_POLICY_TREE *tree,
568 STACK_OF(X509_POLICY_NODE) **pnodes)
569{
570 X509_POLICY_LEVEL *curr;
571 X509_POLICY_NODE *node, *anyptr;
572 STACK_OF(X509_POLICY_NODE) **addnodes;
573 int i;
574 size_t j;
575 curr = tree->levels + tree->nlevel - 1;
576
577 /* If last level contains anyPolicy set is anyPolicy */
578 if (curr->anyPolicy) {
579 if (!tree_add_auth_node(&tree->auth_policies, curr->anyPolicy))
580 return 0;
581 addnodes = pnodes;
582 } else
583 /* Add policies to authority set */
584 addnodes = &tree->auth_policies;
585
586 curr = tree->levels;
587 for (i = 1; i < tree->nlevel; i++) {
588 /*
589 * If no anyPolicy node on this this level it can't appear on lower
590 * levels so end search.
591 */
592 if (!(anyptr = curr->anyPolicy))
593 break;
594 curr++;
595 for (j = 0; j < sk_X509_POLICY_NODE_num(curr->nodes); j++) {
596 node = sk_X509_POLICY_NODE_value(curr->nodes, j);
597 if ((node->parent == anyptr)
598 && !tree_add_auth_node(addnodes, node))
599 return 0;
600 }
601 }
602
603 if (addnodes == pnodes)
604 return 2;
605
606 *pnodes = tree->auth_policies;
607
608 return 1;
609}
610
611static int tree_calculate_user_set(X509_POLICY_TREE *tree,
612 STACK_OF(ASN1_OBJECT) *policy_oids,
613 STACK_OF(X509_POLICY_NODE) *auth_nodes)
614{
615 size_t i;
616 X509_POLICY_NODE *node;
617 ASN1_OBJECT *oid;
618
619 X509_POLICY_NODE *anyPolicy;
620 X509_POLICY_DATA *extra;
621
622 /*
623 * Check if anyPolicy present in authority constrained policy set: this
624 * will happen if it is a leaf node.
625 */
626
627 if (sk_ASN1_OBJECT_num(policy_oids) <= 0)
628 return 1;
629
630 anyPolicy = tree->levels[tree->nlevel - 1].anyPolicy;
631
632 for (i = 0; i < sk_ASN1_OBJECT_num(policy_oids); i++) {
633 oid = sk_ASN1_OBJECT_value(policy_oids, i);
634 if (OBJ_obj2nid(oid) == NID_any_policy) {
635 tree->flags |= POLICY_FLAG_ANY_POLICY;
636 return 1;
637 }
638 }
639
640 for (i = 0; i < sk_ASN1_OBJECT_num(policy_oids); i++) {
641 oid = sk_ASN1_OBJECT_value(policy_oids, i);
642 node = tree_find_sk(auth_nodes, oid);
643 if (!node) {
644 if (!anyPolicy)
645 continue;
646 /*
647 * Create a new node with policy ID from user set and qualifiers
648 * from anyPolicy.
649 */
650 extra = policy_data_new(NULL, oid, node_critical(anyPolicy));
651 if (!extra)
652 return 0;
653 extra->qualifier_set = anyPolicy->data->qualifier_set;
654 extra->flags = POLICY_DATA_FLAG_SHARED_QUALIFIERS
655 | POLICY_DATA_FLAG_EXTRA_NODE;
656 node = level_add_node(NULL, extra, anyPolicy->parent, tree);
657 }
658 if (!tree->user_policies) {
659 tree->user_policies = sk_X509_POLICY_NODE_new_null();
660 if (!tree->user_policies)
661 return 1;
662 }
663 if (!sk_X509_POLICY_NODE_push(tree->user_policies, node))
664 return 0;
665 }
666 return 1;
667
668}
669
670static int tree_evaluate(X509_POLICY_TREE *tree)
671{
672 int ret, i;
673 X509_POLICY_LEVEL *curr = tree->levels + 1;
674 const X509_POLICY_CACHE *cache;
675
676 for (i = 1; i < tree->nlevel; i++, curr++) {
677 cache = policy_cache_set(curr->cert);
678 if (!tree_link_nodes(curr, cache))
679 return 0;
680
681 if (!(curr->flags & X509_V_FLAG_INHIBIT_ANY)
682 && !tree_link_any(curr, cache, tree))
683 return 0;
684 tree_print("before tree_prune()", tree, curr);
685 ret = tree_prune(tree, curr);
686 if (ret != 1)
687 return ret;
688 }
689
690 return 1;
691
692}
693
694static void exnode_free(X509_POLICY_NODE *node)
695{
696 if (node->data && (node->data->flags & POLICY_DATA_FLAG_EXTRA_NODE))
697 OPENSSL_free(node);
698}
699
700void X509_policy_tree_free(X509_POLICY_TREE *tree)
701{
702 X509_POLICY_LEVEL *curr;
703 int i;
704
705 if (!tree)
706 return;
707
708 sk_X509_POLICY_NODE_free(tree->auth_policies);
709 sk_X509_POLICY_NODE_pop_free(tree->user_policies, exnode_free);
710
711 for (i = 0, curr = tree->levels; i < tree->nlevel; i++, curr++) {
712 if (curr->cert)
713 X509_free(curr->cert);
714 if (curr->nodes)
715 sk_X509_POLICY_NODE_pop_free(curr->nodes, policy_node_free);
716 if (curr->anyPolicy)
717 policy_node_free(curr->anyPolicy);
718 }
719
720 if (tree->extra_data)
721 sk_X509_POLICY_DATA_pop_free(tree->extra_data, policy_data_free);
722
723 OPENSSL_free(tree->levels);
724 OPENSSL_free(tree);
725
726}
727
728/*-
729 * Application policy checking function.
730 * Return codes:
731 * 0 Internal Error.
732 * 1 Successful.
733 * -1 One or more certificates contain invalid or inconsistent extensions
734 * -2 User constrained policy set empty and requireExplicit true.
735 */
736
737int X509_policy_check(X509_POLICY_TREE **ptree, int *pexplicit_policy,
738 STACK_OF(X509) *certs,
739 STACK_OF(ASN1_OBJECT) *policy_oids, unsigned int flags)
740{
741 int ret;
742 int calc_ret;
743 X509_POLICY_TREE *tree = NULL;
744 STACK_OF(X509_POLICY_NODE) *nodes, *auth_nodes = NULL;
745 *ptree = NULL;
746
747 *pexplicit_policy = 0;
748 ret = tree_init(&tree, certs, flags);
749
750 switch (ret) {
751
752 /* Tree empty requireExplicit False: OK */
753 case 2:
754 return 1;
755
756 /* Some internal error */
757 case -1:
758 return -1;
759
760 /* Some internal error */
761 case 0:
762 return 0;
763
764 /* Tree empty requireExplicit True: Error */
765
766 case 6:
767 *pexplicit_policy = 1;
768 return -2;
769
770 /* Tree OK requireExplicit True: OK and continue */
771 case 5:
772 *pexplicit_policy = 1;
773 break;
774
775 /* Tree OK: continue */
776
777 case 1:
778 if (!tree)
779 /*
780 * tree_init() returns success and a null tree
781 * if it's just looking at a trust anchor.
782 * I'm not sure that returning success here is
783 * correct, but I'm sure that reporting this
784 * as an internal error which our caller
785 * interprets as a malloc failure is wrong.
786 */
787 return 1;
788 break;
789 }
790
791 if (!tree)
792 goto error;
793 ret = tree_evaluate(tree);
794
795 tree_print("tree_evaluate()", tree, NULL);
796
797 if (ret <= 0)
798 goto error;
799
800 /* Return value 2 means tree empty */
801 if (ret == 2) {
802 X509_policy_tree_free(tree);
803 if (*pexplicit_policy)
804 return -2;
805 else
806 return 1;
807 }
808
809 /* Tree is not empty: continue */
810
811 calc_ret = tree_calculate_authority_set(tree, &auth_nodes);
812
813 if (!calc_ret)
814 goto error;
815
816 ret = tree_calculate_user_set(tree, policy_oids, auth_nodes);
817
818 if (calc_ret == 2)
819 sk_X509_POLICY_NODE_free(auth_nodes);
820
821 if (!ret)
822 goto error;
823
824
825 if (tree)
826 *ptree = tree;
827
828 if (*pexplicit_policy) {
829 nodes = X509_policy_tree_get0_user_policies(tree);
830 if (sk_X509_POLICY_NODE_num(nodes) <= 0)
831 return -2;
832 }
833
834 return 1;
835
836 error:
837
838 X509_policy_tree_free(tree);
839
840 return 0;
841
842}
843