/*
 * 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/mem.h>
#include <openssl/obj.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>

#include "internal.h"

static int node_cmp(const X509_POLICY_NODE **a, const X509_POLICY_NODE **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;
  size_t idx;

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

  sk_X509_POLICY_NODE_sort(nodes);
  if (!sk_X509_POLICY_NODE_find(nodes, &idx, &l)) {
    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;
  size_t 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_malloc(sizeof(X509_POLICY_NODE));
  if (!node) {
    return NULL;
  }
  node->data = data;
  node->parent = parent;
  node->nchild = 0;
  if (level) {
    if (OBJ_obj2nid(data->valid_policy) == NID_any_policy) {
      if (level->anyPolicy) {
        goto node_error;
      }
      level->anyPolicy = node;
    } else {
      if (!level->nodes) {
        level->nodes = policy_node_cmp_new();
      }
      if (!level->nodes) {
        goto node_error;
      }
      if (!sk_X509_POLICY_NODE_push(level->nodes, node)) {
        goto node_error;
      }
    }
  }

  if (tree) {
    if (!tree->extra_data) {
      tree->extra_data = sk_X509_POLICY_DATA_new_null();
    }
    if (!tree->extra_data) {
      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 0;
}

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) {
  size_t 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;
}