/*
 * 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 <openssl/asn1.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>

#include "pcy_int.h"

static int node_cmp(const X509_POLICY_NODE *const *a,
                    const X509_POLICY_NODE *const *b)
{
    return OBJ_cmp((*a)->data->valid_policy, (*b)->data->valid_policy);
}

STACK_OF(X509_POLICY_NODE) *policy_node_cmp_new(void)
{
    return sk_X509_POLICY_NODE_new(node_cmp);
}

X509_POLICY_NODE *tree_find_sk(STACK_OF(X509_POLICY_NODE) *nodes,
                               const ASN1_OBJECT *id)
{
    X509_POLICY_DATA n;
    X509_POLICY_NODE l;
    int idx;

    n.valid_policy = (ASN1_OBJECT *)id;
    l.data = &n;

    idx = sk_X509_POLICY_NODE_find(nodes, &l);
    if (idx == -1)
        return NULL;

    return sk_X509_POLICY_NODE_value(nodes, idx);

}

X509_POLICY_NODE *level_find_node(const X509_POLICY_LEVEL *level,
                                  const X509_POLICY_NODE *parent,
                                  const ASN1_OBJECT *id)
{
    X509_POLICY_NODE *node;
    int i;
    for (i = 0; i < sk_X509_POLICY_NODE_num(level->nodes); i++) {
        node = sk_X509_POLICY_NODE_value(level->nodes, i);
        if (node->parent == parent) {
            if (!OBJ_cmp(node->data->valid_policy, id))
                return node;
        }
    }
    return NULL;
}

X509_POLICY_NODE *level_add_node(X509_POLICY_LEVEL *level,
                                 X509_POLICY_DATA *data,
                                 X509_POLICY_NODE *parent,
                                 X509_POLICY_TREE *tree)
{
    X509_POLICY_NODE *node;

    node = OPENSSL_zalloc(sizeof(*node));
    if (node == NULL)
        return NULL;
    node->data = data;
    node->parent = parent;
    if (level) {
        if (OBJ_obj2nid(data->valid_policy) == NID_any_policy) {
            if (level->anyPolicy)
                goto node_error;
            level->anyPolicy = node;
        } else {

            if (level->nodes == NULL)
                level->nodes = policy_node_cmp_new();
            if (level->nodes == NULL)
                goto node_error;
            if (!sk_X509_POLICY_NODE_push(level->nodes, node))
                goto node_error;
        }
    }

    if (tree) {
        if (tree->extra_data == NULL)
            tree->extra_data = sk_X509_POLICY_DATA_new_null();
        if (tree->extra_data == NULL)
            goto node_error;
        if (!sk_X509_POLICY_DATA_push(tree->extra_data, data))
            goto node_error;
    }

    if (parent)
        parent->nchild++;

    return node;

 node_error:
    policy_node_free(node);
    return NULL;
}

void policy_node_free(X509_POLICY_NODE *node)
{
    OPENSSL_free(node);
}

/*
 * See if a policy node matches a policy OID. If mapping enabled look through
 * expected policy set otherwise just valid policy.
 */

int policy_node_match(const X509_POLICY_LEVEL *lvl,
                      const X509_POLICY_NODE *node, const ASN1_OBJECT *oid)
{
    int i;
    ASN1_OBJECT *policy_oid;
    const X509_POLICY_DATA *x = node->data;

    if ((lvl->flags & X509_V_FLAG_INHIBIT_MAP)
        || !(x->flags & POLICY_DATA_FLAG_MAP_MASK)) {
        if (!OBJ_cmp(x->valid_policy, oid))
            return 1;
        return 0;
    }

    for (i = 0; i < sk_ASN1_OBJECT_num(x->expected_policy_set); i++) {
        policy_oid = sk_ASN1_OBJECT_value(x->expected_policy_set, i);
        if (!OBJ_cmp(policy_oid, oid))
            return 1;
    }
    return 0;

}