/*

 * Copyright 2004-2023 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <openssl/asn1.h>

#include <openssl/x509.h>

#include <openssl/x509v3.h>

#include <openssl/err.h>

#include "pcy_local.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) *ossl_policy_node_cmp_new(void)

{

    return sk_X509_POLICY_NODE_new(node_cmp);

}

X509_POLICY_NODE *ossl_policy_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);

    return sk_X509_POLICY_NODE_value(nodes, idx);

}

X509_POLICY_NODE *ossl_policy_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 *ossl_policy_level_add_node(X509_POLICY_LEVEL *level,

    X509_POLICY_DATA *data,

    X509_POLICY_NODE *parent,

    X509_POLICY_TREE *tree,

    int extra_data)

{

    X509_POLICY_NODE *node;

    /* Verify that the tree isn't too large.  This mitigates CVE-2023-0464 */

    if (tree->node_maximum > 0 && tree->node_count >= tree->node_maximum)

        return NULL;

    node = OPENSSL_zalloc(sizeof(*node));

    if (node == NULL)

        return NULL;

    node->data = data;

    node->parent = parent;

    if (level != NULL) {

        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 = ossl_policy_node_cmp_new();

            if (level->nodes == NULL) {

                ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB);

                goto node_error;

            }

            if (!sk_X509_POLICY_NODE_push(level->nodes, node)) {

                ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);

                goto node_error;

            }

        }

    }

    if (extra_data) {

        if (tree->extra_data == NULL)

            tree->extra_data = sk_X509_POLICY_DATA_new_null();

        if (tree->extra_data == NULL) {

            ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);

            goto extra_data_error;

        }

        if (!sk_X509_POLICY_DATA_push(tree->extra_data, data)) {

            ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);

            goto extra_data_error;

        }

    }

    tree->node_count++;

    if (parent)

        parent->nchild++;

    return node;

extra_data_error:

    if (level != NULL) {

        if (level->anyPolicy == node)

            level->anyPolicy = NULL;

        else

            (void)sk_X509_POLICY_NODE_pop(level->nodes);

    }

node_error:

    ossl_policy_node_free(node);

    return NULL;

}

void ossl_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 ossl_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;

}