Back to the standard "app" module.

This return to "app" instead of "bitmask_android" is due to this reading: https://developer.android.com/sdk/installing/studio-build.html#projectStructure
I'll have to tweak the final apk name in build.gradle.

1 files changed, 872 insertions, 0 deletions

diff --git a/app/openssl/crypto/x509v3/pcy_tree.c b/app/openssl/crypto/x509v3/pcy_tree.c
new file mode 100644
index 00000000..bb977734
--- /dev/null
+++ b/app/openssl/crypto/x509v3/pcy_tree.c
@@ -0,0 +1,872 @@
+/* pcy_tree.c */
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 2004.
+ */
+/* ====================================================================
+ * Copyright (c) 2004 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include "cryptlib.h"
+#include <openssl/x509.h>
+#include <openssl/x509v3.h>
+
+#include "pcy_int.h"
+
+/* Enable this to print out the complete policy tree at various point during
+ * evaluation.
+ */
+
+/*#define OPENSSL_POLICY_DEBUG*/
+
+#ifdef OPENSSL_POLICY_DEBUG
+
+static void expected_print(BIO *err, X509_POLICY_LEVEL *lev,
+				X509_POLICY_NODE *node, int indent)
+	{
+	if (	    (lev->flags & X509_V_FLAG_INHIBIT_MAP)
+		|| !(node->data->flags & POLICY_DATA_FLAG_MAP_MASK))
+		BIO_puts(err, "  Not Mapped\n");
+	else
+		{
+		int i;
+		STACK_OF(ASN1_OBJECT) *pset = node->data->expected_policy_set;
+		ASN1_OBJECT *oid;
+		BIO_puts(err, "  Expected: ");
+		for (i = 0; i < sk_ASN1_OBJECT_num(pset); i++)
+			{
+			oid = sk_ASN1_OBJECT_value(pset, i);
+			if (i)
+				BIO_puts(err, ", ");
+			i2a_ASN1_OBJECT(err, oid);
+			}
+		BIO_puts(err, "\n");
+		}
+	}
+
+static void tree_print(char *str, X509_POLICY_TREE *tree,
+			X509_POLICY_LEVEL *curr)
+	{
+	X509_POLICY_LEVEL *plev;
+	X509_POLICY_NODE *node;
+	int i;
+	BIO *err;
+	err = BIO_new_fp(stderr, BIO_NOCLOSE);
+	if (!curr)
+		curr = tree->levels + tree->nlevel;
+	else
+		curr++;
+	BIO_printf(err, "Level print after %s\n", str);
+	BIO_printf(err, "Printing Up to Level %ld\n", curr - tree->levels);
+	for (plev = tree->levels; plev != curr; plev++)
+		{
+		BIO_printf(err, "Level %ld, flags = %x\n",
+				plev - tree->levels, plev->flags);
+		for (i = 0; i < sk_X509_POLICY_NODE_num(plev->nodes); i++)
+			{
+			node = sk_X509_POLICY_NODE_value(plev->nodes, i);
+			X509_POLICY_NODE_print(err, node, 2);
+			expected_print(err, plev, node, 2);
+			BIO_printf(err, "  Flags: %x\n", node->data->flags);
+			}
+		if (plev->anyPolicy)
+			X509_POLICY_NODE_print(err, plev->anyPolicy, 2);
+		}
+
+	BIO_free(err);
+
+	}
+#else
+
+#define tree_print(a,b,c) /* */
+
+#endif
+
+/* Initialize policy tree. Return values:
+ *  0 Some internal error occured.
+ * -1 Inconsistent or invalid extensions in certificates.
+ *  1 Tree initialized OK.
+ *  2 Policy tree is empty.
+ *  5 Tree OK and requireExplicitPolicy true.
+ *  6 Tree empty and requireExplicitPolicy true.
+ */
+
+static int tree_init(X509_POLICY_TREE **ptree, STACK_OF(X509) *certs,
+			unsigned int flags)
+	{
+	X509_POLICY_TREE *tree;
+	X509_POLICY_LEVEL *level;
+	const X509_POLICY_CACHE *cache;
+	X509_POLICY_DATA *data = NULL;
+	X509 *x;
+	int ret = 1;
+	int i, n;
+	int explicit_policy;
+	int any_skip;
+	int map_skip;
+	*ptree = NULL;
+	n = sk_X509_num(certs);
+
+#if 0
+	/* Disable policy mapping for now... */
+	flags |= X509_V_FLAG_INHIBIT_MAP;
+#endif
+
+	if (flags & X509_V_FLAG_EXPLICIT_POLICY)
+		explicit_policy = 0;
+	else
+		explicit_policy = n + 1;
+
+	if (flags & X509_V_FLAG_INHIBIT_ANY)
+		any_skip = 0;
+	else
+		any_skip = n + 1;
+
+	if (flags & X509_V_FLAG_INHIBIT_MAP)
+		map_skip = 0;
+	else
+		map_skip = n + 1;
+
+	/* Can't do anything with just a trust anchor */
+	if (n == 1)
+		return 1;
+	/* First setup policy cache in all certificates apart from the
+	 * trust anchor. Note any bad cache results on the way. Also can
+	 * calculate explicit_policy value at this point.
+	 */
+	for (i = n - 2; i >= 0; i--)
+		{
+		x = sk_X509_value(certs, i);
+		X509_check_purpose(x, -1, -1);
+		cache = policy_cache_set(x);
+		/* If cache NULL something bad happened: return immediately */
+		if (cache == NULL)
+			return 0;
+		/* If inconsistent extensions keep a note of it but continue */
+		if (x->ex_flags & EXFLAG_INVALID_POLICY)
+			ret = -1;
+		/* Otherwise if we have no data (hence no CertificatePolicies)
+		 * and haven't already set an inconsistent code note it.
+		 */
+		else if ((ret == 1) && !cache->data)
+			ret = 2;
+		if (explicit_policy > 0)
+			{
+			if (!(x->ex_flags & EXFLAG_SI))
+				explicit_policy--;
+			if ((cache->explicit_skip != -1)
+				&& (cache->explicit_skip < explicit_policy))
+				explicit_policy = cache->explicit_skip;
+			}
+		}
+
+	if (ret != 1)
+		{
+		if (ret == 2 && !explicit_policy)
+			return 6;
+		return ret;
+		}
+
+
+	/* If we get this far initialize the tree */
+
+	tree = OPENSSL_malloc(sizeof(X509_POLICY_TREE));
+
+	if (!tree)
+		return 0;
+
+	tree->flags = 0;
+	tree->levels = OPENSSL_malloc(sizeof(X509_POLICY_LEVEL) * n);
+	tree->nlevel = 0;
+	tree->extra_data = NULL;
+	tree->auth_policies = NULL;
+	tree->user_policies = NULL;
+
+	if (!tree->levels)
+		{
+		OPENSSL_free(tree);
+		return 0;
+		}
+
+	memset(tree->levels, 0, n * sizeof(X509_POLICY_LEVEL));
+
+	tree->nlevel = n;
+
+	level = tree->levels;
+
+	/* Root data: initialize to anyPolicy */
+
+	data = policy_data_new(NULL, OBJ_nid2obj(NID_any_policy), 0);
+
+	if (!data || !level_add_node(level, data, NULL, tree))
+		goto bad_tree;
+
+	for (i = n - 2; i >= 0; i--)
+		{
+		level++;
+		x = sk_X509_value(certs, i);
+		cache = policy_cache_set(x);
+		CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
+		level->cert = x;
+
+		if (!cache->anyPolicy)
+				level->flags |= X509_V_FLAG_INHIBIT_ANY;
+
+		/* Determine inhibit any and inhibit map flags */
+		if (any_skip == 0)
+			{
+			/* Any matching allowed if certificate is self
+			 * issued and not the last in the chain.
+			 */
+			if (!(x->ex_flags & EXFLAG_SI) || (i == 0))
+				level->flags |= X509_V_FLAG_INHIBIT_ANY;
+			}
+		else
+			{
+			if (!(x->ex_flags & EXFLAG_SI))
+				any_skip--;
+			if ((cache->any_skip >= 0)
+				&& (cache->any_skip < any_skip))
+				any_skip = cache->any_skip;
+			}
+
+		if (map_skip == 0)
+			level->flags |= X509_V_FLAG_INHIBIT_MAP;
+		else
+			{
+			if (!(x->ex_flags & EXFLAG_SI))
+				map_skip--;
+			if ((cache->map_skip >= 0)
+				&& (cache->map_skip < map_skip))
+				map_skip = cache->map_skip;
+			}
+
+		}
+
+	*ptree = tree;
+
+	if (explicit_policy)
+		return 1;
+	else
+		return 5;
+
+	bad_tree:
+
+	X509_policy_tree_free(tree);
+
+	return 0;
+
+	}
+
+static int tree_link_matching_nodes(X509_POLICY_LEVEL *curr,
+				const X509_POLICY_DATA *data)
+	{
+	X509_POLICY_LEVEL *last = curr - 1;
+	X509_POLICY_NODE *node;
+	int i, matched = 0;
+	/* Iterate through all in nodes linking matches */
+	for (i = 0; i < sk_X509_POLICY_NODE_num(last->nodes); i++)
+		{
+		node = sk_X509_POLICY_NODE_value(last->nodes, i);
+		if (policy_node_match(last, node, data->valid_policy))
+			{
+			if (!level_add_node(curr, data, node, NULL))
+				return 0;
+			matched = 1;
+			}
+		}
+	if (!matched && last->anyPolicy)
+		{
+		if (!level_add_node(curr, data, last->anyPolicy, NULL))
+			return 0;
+		}
+	return 1;
+	}
+
+/* This corresponds to RFC3280 6.1.3(d)(1):
+ * link any data from CertificatePolicies onto matching parent
+ * or anyPolicy if no match.
+ */
+
+static int tree_link_nodes(X509_POLICY_LEVEL *curr,
+				const X509_POLICY_CACHE *cache)
+	{
+	int i;
+	X509_POLICY_DATA *data;
+
+	for (i = 0; i < sk_X509_POLICY_DATA_num(cache->data); i++)
+		{
+		data = sk_X509_POLICY_DATA_value(cache->data, i);
+		/* If a node is mapped any it doesn't have a corresponding
+		 * CertificatePolicies entry. 
+		 * However such an identical node would be created
+		 * if anyPolicy matching is enabled because there would be
+		 * no match with the parent valid_policy_set. So we create
+		 * link because then it will have the mapping flags
+		 * right and we can prune it later.
+		 */
+#if 0
+		if ((data->flags & POLICY_DATA_FLAG_MAPPED_ANY)
+			&& !(curr->flags & X509_V_FLAG_INHIBIT_ANY))
+			continue;
+#endif
+		/* Look for matching nodes in previous level */
+		if (!tree_link_matching_nodes(curr, data))
+				return 0;
+		}
+	return 1;
+	}
+
+/* This corresponds to RFC3280 6.1.3(d)(2):
+ * Create new data for any unmatched policies in the parent and link
+ * to anyPolicy.
+ */
+
+static int tree_add_unmatched(X509_POLICY_LEVEL *curr,
+			const X509_POLICY_CACHE *cache,
+			const ASN1_OBJECT *id,
+			X509_POLICY_NODE *node,
+			X509_POLICY_TREE *tree)
+	{
+	X509_POLICY_DATA *data;
+	if (id == NULL)
+		id = node->data->valid_policy;
+	/* Create a new node with qualifiers from anyPolicy and
+	 * id from unmatched node.
+	 */
+	data = policy_data_new(NULL, id, node_critical(node));
+
+	if (data == NULL)
+		return 0;
+	/* Curr may not have anyPolicy */
+	data->qualifier_set = cache->anyPolicy->qualifier_set;
+	data->flags |= POLICY_DATA_FLAG_SHARED_QUALIFIERS;
+	if (!level_add_node(curr, data, node, tree))
+		{
+		policy_data_free(data);
+		return 0;
+		}
+
+	return 1;
+	}
+
+static int tree_link_unmatched(X509_POLICY_LEVEL *curr,
+			const X509_POLICY_CACHE *cache,
+			X509_POLICY_NODE *node,
+			X509_POLICY_TREE *tree)
+	{
+	const X509_POLICY_LEVEL *last = curr - 1;
+	int i;
+
+	if (	    (last->flags & X509_V_FLAG_INHIBIT_MAP)
+		|| !(node->data->flags & POLICY_DATA_FLAG_MAPPED))
+		{
+		/* If no policy mapping: matched if one child present */
+		if (node->nchild)
+			return 1;
+		if (!tree_add_unmatched(curr, cache, NULL, node, tree))
+			return 0;
+		/* Add it */
+		}
+	else
+		{
+		/* If mapping: matched if one child per expected policy set */
+		STACK_OF(ASN1_OBJECT) *expset = node->data->expected_policy_set;
+		if (node->nchild == sk_ASN1_OBJECT_num(expset))
+			return 1;
+		/* Locate unmatched nodes */
+		for (i = 0; i < sk_ASN1_OBJECT_num(expset); i++)
+			{
+			ASN1_OBJECT *oid = sk_ASN1_OBJECT_value(expset, i);
+			if (level_find_node(curr, node, oid))
+				continue;
+			if (!tree_add_unmatched(curr, cache, oid, node, tree))
+				return 0;
+			}
+
+		}
+
+	return 1;
+
+	}
+
+static int tree_link_any(X509_POLICY_LEVEL *curr,
+			const X509_POLICY_CACHE *cache,
+			X509_POLICY_TREE *tree)
+	{
+	int i;
+	/*X509_POLICY_DATA *data;*/
+	X509_POLICY_NODE *node;
+	X509_POLICY_LEVEL *last = curr - 1;
+
+	for (i = 0; i < sk_X509_POLICY_NODE_num(last->nodes); i++)
+		{
+		node = sk_X509_POLICY_NODE_value(last->nodes, i);
+
+		if (!tree_link_unmatched(curr, cache, node, tree))
+			return 0;
+
+#if 0
+
+		/* Skip any node with any children: we only want unmathced
+		 * nodes.
+		 *
+		 * Note: need something better for policy mapping
+		 * because each node may have multiple children 
+		 */
+		if (node->nchild)
+			continue;
+
+		/* Create a new node with qualifiers from anyPolicy and
+		 * id from unmatched node.
+		 */
+		data = policy_data_new(NULL, node->data->valid_policy, 
+						node_critical(node));
+
+		if (data == NULL)
+			return 0;
+		/* Curr may not have anyPolicy */
+		data->qualifier_set = cache->anyPolicy->qualifier_set;
+		data->flags |= POLICY_DATA_FLAG_SHARED_QUALIFIERS;
+		if (!level_add_node(curr, data, node, tree))
+			{
+			policy_data_free(data);
+			return 0;
+			}
+
+#endif
+
+		}
+	/* Finally add link to anyPolicy */
+	if (last->anyPolicy)
+		{
+		if (!level_add_node(curr, cache->anyPolicy,
+						last->anyPolicy, NULL))
+			return 0;
+		}
+	return 1;
+	}
+
+/* Prune the tree: delete any child mapped child data on the current level
+ * then proceed up the tree deleting any data with no children. If we ever
+ * have no data on a level we can halt because the tree will be empty.
+ */
+
+static int tree_prune(X509_POLICY_TREE *tree, X509_POLICY_LEVEL *curr)
+	{
+	STACK_OF(X509_POLICY_NODE) *nodes;
+	X509_POLICY_NODE *node;
+	int i;
+	nodes = curr->nodes;
+	if (curr->flags & X509_V_FLAG_INHIBIT_MAP)
+		{
+		for (i = sk_X509_POLICY_NODE_num(nodes) - 1; i >= 0; i--)
+			{
+			node = sk_X509_POLICY_NODE_value(nodes, i);
+			/* Delete any mapped data: see RFC3280 XXXX */
+			if (node->data->flags & POLICY_DATA_FLAG_MAP_MASK)
+				{
+				node->parent->nchild--;
+				OPENSSL_free(node);
+				(void)sk_X509_POLICY_NODE_delete(nodes,i);
+				}
+			}
+		}
+
+	for(;;)	{
+		--curr;
+		nodes = curr->nodes;
+		for (i = sk_X509_POLICY_NODE_num(nodes) - 1; i >= 0; i--)
+			{
+			node = sk_X509_POLICY_NODE_value(nodes, i);
+			if (node->nchild == 0)
+				{
+				node->parent->nchild--;
+				OPENSSL_free(node);
+				(void)sk_X509_POLICY_NODE_delete(nodes, i);
+				}
+			}
+		if (curr->anyPolicy && !curr->anyPolicy->nchild)
+			{
+			if (curr->anyPolicy->parent)
+				curr->anyPolicy->parent->nchild--;
+			OPENSSL_free(curr->anyPolicy);
+			curr->anyPolicy = NULL;
+			}
+		if (curr == tree->levels)
+			{
+			/* If we zapped anyPolicy at top then tree is empty */
+			if (!curr->anyPolicy)
+					return 2;
+			return 1;
+			}
+		}
+
+	return 1;
+
+	}
+
+static int tree_add_auth_node(STACK_OF(X509_POLICY_NODE) **pnodes,
+						 X509_POLICY_NODE *pcy)
+	{
+	if (!*pnodes)
+		{
+		*pnodes = policy_node_cmp_new();
+		if (!*pnodes)
+			return 0;
+		}
+	else if (sk_X509_POLICY_NODE_find(*pnodes, pcy) != -1)
+		return 1;
+
+	if (!sk_X509_POLICY_NODE_push(*pnodes, pcy))
+		return 0;
+
+	return 1;
+
+	}
+
+/* Calculate the authority set based on policy tree.
+ * The 'pnodes' parameter is used as a store for the set of policy nodes
+ * used to calculate the user set. If the authority set is not anyPolicy
+ * then pnodes will just point to the authority set. If however the authority
+ * set is anyPolicy then the set of valid policies (other than anyPolicy)
+ * is store in pnodes. The return value of '2' is used in this case to indicate
+ * that pnodes should be freed.
+ */
+
+static int tree_calculate_authority_set(X509_POLICY_TREE *tree,
+					STACK_OF(X509_POLICY_NODE) **pnodes)
+	{
+	X509_POLICY_LEVEL *curr;
+	X509_POLICY_NODE *node, *anyptr;
+	STACK_OF(X509_POLICY_NODE) **addnodes;
+	int i, j;
+	curr = tree->levels + tree->nlevel - 1;
+
+	/* If last level contains anyPolicy set is anyPolicy */
+	if (curr->anyPolicy)
+		{
+		if (!tree_add_auth_node(&tree->auth_policies, curr->anyPolicy))
+			return 0;
+		addnodes = pnodes;
+		}
+	else
+		/* Add policies to authority set */
+		addnodes = &tree->auth_policies;
+
+	curr = tree->levels;
+	for (i = 1; i < tree->nlevel; i++)
+		{
+		/* If no anyPolicy node on this this level it can't
+		 * appear on lower levels so end search.
+		 */
+		if (!(anyptr = curr->anyPolicy))
+			break;
+		curr++;
+		for (j = 0; j < sk_X509_POLICY_NODE_num(curr->nodes); j++)
+			{
+			node = sk_X509_POLICY_NODE_value(curr->nodes, j);
+			if ((node->parent == anyptr)
+				&& !tree_add_auth_node(addnodes, node))
+					return 0;
+			}
+		}
+
+	if (addnodes == pnodes)
+		return 2;
+
+	*pnodes = tree->auth_policies;
+
+	return 1;
+	}
+
+static int tree_calculate_user_set(X509_POLICY_TREE *tree,
+				STACK_OF(ASN1_OBJECT) *policy_oids,
+				STACK_OF(X509_POLICY_NODE) *auth_nodes)
+	{
+	int i;
+	X509_POLICY_NODE *node;
+	ASN1_OBJECT *oid;
+
+	X509_POLICY_NODE *anyPolicy;
+	X509_POLICY_DATA *extra;
+
+	/* Check if anyPolicy present in authority constrained policy set:
+	 * this will happen if it is a leaf node.
+	 */
+
+	if (sk_ASN1_OBJECT_num(policy_oids) <= 0)
+		return 1;
+
+	anyPolicy = tree->levels[tree->nlevel - 1].anyPolicy;
+
+	for (i = 0; i < sk_ASN1_OBJECT_num(policy_oids); i++)
+		{
+		oid = sk_ASN1_OBJECT_value(policy_oids, i);
+		if (OBJ_obj2nid(oid) == NID_any_policy)
+			{
+			tree->flags |= POLICY_FLAG_ANY_POLICY;
+			return 1;
+			}
+		}
+
+	for (i = 0; i < sk_ASN1_OBJECT_num(policy_oids); i++)
+		{
+		oid = sk_ASN1_OBJECT_value(policy_oids, i);
+		node = tree_find_sk(auth_nodes, oid);
+		if (!node)
+			{
+			if (!anyPolicy)
+				continue;
+			/* Create a new node with policy ID from user set
+			 * and qualifiers from anyPolicy.
+			 */
+			extra = policy_data_new(NULL, oid,
+						node_critical(anyPolicy));
+			if (!extra)
+				return 0;
+			extra->qualifier_set = anyPolicy->data->qualifier_set;
+			extra->flags = POLICY_DATA_FLAG_SHARED_QUALIFIERS
+						| POLICY_DATA_FLAG_EXTRA_NODE;
+			node = level_add_node(NULL, extra, anyPolicy->parent,
+						tree);
+			}
+		if (!tree->user_policies)
+			{
+			tree->user_policies = sk_X509_POLICY_NODE_new_null();
+			if (!tree->user_policies)
+				return 1;
+			}
+		if (!sk_X509_POLICY_NODE_push(tree->user_policies, node))
+			return 0;
+		}
+	return 1;
+
+	}
+
+static int tree_evaluate(X509_POLICY_TREE *tree)
+	{
+	int ret, i;
+	X509_POLICY_LEVEL *curr = tree->levels + 1;
+	const X509_POLICY_CACHE *cache;
+
+	for(i = 1; i < tree->nlevel; i++, curr++)
+		{
+		cache = policy_cache_set(curr->cert);
+		if (!tree_link_nodes(curr, cache))
+			return 0;
+
+		if (!(curr->flags & X509_V_FLAG_INHIBIT_ANY)
+			&& !tree_link_any(curr, cache, tree))
+			return 0;
+	tree_print("before tree_prune()", tree, curr);
+		ret = tree_prune(tree, curr);
+		if (ret != 1)
+			return ret;
+		}
+
+	return 1;
+
+	}
+
+static void exnode_free(X509_POLICY_NODE *node)
+	{
+	if (node->data && (node->data->flags & POLICY_DATA_FLAG_EXTRA_NODE))
+		OPENSSL_free(node);
+	}
+
+
+void X509_policy_tree_free(X509_POLICY_TREE *tree)
+	{
+	X509_POLICY_LEVEL *curr;
+	int i;
+
+	if (!tree)
+		return;
+
+	sk_X509_POLICY_NODE_free(tree->auth_policies);
+	sk_X509_POLICY_NODE_pop_free(tree->user_policies, exnode_free);
+
+	for(i = 0, curr = tree->levels; i < tree->nlevel; i++, curr++)
+		{
+		if (curr->cert)
+			X509_free(curr->cert);
+		if (curr->nodes)
+			sk_X509_POLICY_NODE_pop_free(curr->nodes,
+						policy_node_free);
+		if (curr->anyPolicy)
+			policy_node_free(curr->anyPolicy);
+		}
+
+	if (tree->extra_data)
+		sk_X509_POLICY_DATA_pop_free(tree->extra_data,
+						policy_data_free);
+
+	OPENSSL_free(tree->levels);
+	OPENSSL_free(tree);
+
+	}
+
+/* Application policy checking function.
+ * Return codes:
+ *  0 	Internal Error.
+ *  1   Successful.
+ * -1   One or more certificates contain invalid or inconsistent extensions
+ * -2	User constrained policy set empty and requireExplicit true.
+ */
+
+int X509_policy_check(X509_POLICY_TREE **ptree, int *pexplicit_policy,
+			STACK_OF(X509) *certs,
+			STACK_OF(ASN1_OBJECT) *policy_oids,
+			unsigned int flags)
+	{
+	int ret;
+	X509_POLICY_TREE *tree = NULL;
+	STACK_OF(X509_POLICY_NODE) *nodes, *auth_nodes = NULL;
+	*ptree = NULL;
+
+	*pexplicit_policy = 0;
+	ret = tree_init(&tree, certs, flags);
+
+	switch (ret)
+		{
+
+		/* Tree empty requireExplicit False: OK */
+		case 2:
+		return 1;
+
+		/* Some internal error */
+		case -1:
+		return -1;
+
+		/* Some internal error */
+		case 0:
+		return 0;
+
+		/* Tree empty requireExplicit True: Error */
+
+		case 6:
+		*pexplicit_policy = 1;
+		return -2;
+
+		/* Tree OK requireExplicit True: OK and continue */
+		case 5:
+		*pexplicit_policy = 1;
+		break;
+
+		/* Tree OK: continue */
+
+		case 1:
+		if (!tree)
+			/*
+			 * tree_init() returns success and a null tree
+			 * if it's just looking at a trust anchor.
+			 * I'm not sure that returning success here is
+			 * correct, but I'm sure that reporting this
+			 * as an internal error which our caller
+			 * interprets as a malloc failure is wrong.
+			 */
+			return 1;
+		break;
+		}
+
+	if (!tree) goto error;
+	ret = tree_evaluate(tree);
+
+	tree_print("tree_evaluate()", tree, NULL);
+
+	if (ret <= 0)
+		goto error;
+
+	/* Return value 2 means tree empty */
+	if (ret == 2)
+		{
+		X509_policy_tree_free(tree);
+		if (*pexplicit_policy)
+			return -2;
+		else
+			return 1;
+		}
+
+	/* Tree is not empty: continue */
+
+	ret = tree_calculate_authority_set(tree, &auth_nodes);
+
+	if (!ret)
+		goto error;
+
+	if (!tree_calculate_user_set(tree, policy_oids, auth_nodes))
+		goto error;
+	
+	if (ret == 2)
+		sk_X509_POLICY_NODE_free(auth_nodes);
+
+	if (tree)
+		*ptree = tree;
+
+	if (*pexplicit_policy)
+		{
+		nodes = X509_policy_tree_get0_user_policies(tree);
+		if (sk_X509_POLICY_NODE_num(nodes) <= 0)
+			return -2;
+		}
+
+	return 1;
+
+	error:
+
+	X509_policy_tree_free(tree);
+
+	return 0;
+
+	}
+