/*
 * 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
 */

typedef struct X509_POLICY_DATA_st X509_POLICY_DATA;

DEFINE_STACK_OF(X509_POLICY_DATA)

/* Internal structures */

/*
 * This structure and the field names correspond to the Policy 'node' of
 * RFC3280. NB this structure contains no pointers to parent or child data:
 * X509_POLICY_NODE contains that. This means that the main policy data can
 * be kept static and cached with the certificate.
 */

struct X509_POLICY_DATA_st {
    unsigned int flags;
    /* Policy OID and qualifiers for this data */
    ASN1_OBJECT *valid_policy;
    STACK_OF(POLICYQUALINFO) *qualifier_set;
    STACK_OF(ASN1_OBJECT) *expected_policy_set;
};

/* X509_POLICY_DATA flags values */

/*
 * This flag indicates the structure has been mapped using a policy mapping
 * extension. If policy mapping is not active its references get deleted.
 */

#define POLICY_DATA_FLAG_MAPPED                 0x1

/*
 * This flag indicates the data doesn't correspond to a policy in Certificate
 * Policies: it has been mapped to any policy.
 */

#define POLICY_DATA_FLAG_MAPPED_ANY             0x2

/* AND with flags to see if any mapping has occurred */

#define POLICY_DATA_FLAG_MAP_MASK               0x3

/* qualifiers are shared and shouldn't be freed */

#define POLICY_DATA_FLAG_SHARED_QUALIFIERS      0x4

/* Parent node is an extra node and should be freed */

#define POLICY_DATA_FLAG_EXTRA_NODE             0x8

/* Corresponding CertificatePolicies is critical */

#define POLICY_DATA_FLAG_CRITICAL               0x10

/* This structure is cached with a certificate */

struct X509_POLICY_CACHE_st {
    /* anyPolicy data or NULL if no anyPolicy */
    X509_POLICY_DATA *anyPolicy;
    /* other policy data */
    STACK_OF(X509_POLICY_DATA) *data;
    /* If InhibitAnyPolicy present this is its value or -1 if absent. */
    long any_skip;
    /*
     * If policyConstraints and requireExplicitPolicy present this is its
     * value or -1 if absent.
     */
    long explicit_skip;
    /*
     * If policyConstraints and policyMapping present this is its value or -1
     * if absent.
     */
    long map_skip;
};

/*
 * #define POLICY_CACHE_FLAG_CRITICAL POLICY_DATA_FLAG_CRITICAL
 */

/* This structure represents the relationship between nodes */

struct X509_POLICY_NODE_st {
    /* node data this refers to */
    const X509_POLICY_DATA *data;
    /* Parent node */
    X509_POLICY_NODE *parent;
    /* Number of child nodes */
    int nchild;
};

struct X509_POLICY_LEVEL_st {
    /* Cert for this level */
    X509 *cert;
    /* nodes at this level */
    STACK_OF(X509_POLICY_NODE) *nodes;
    /* anyPolicy node */
    X509_POLICY_NODE *anyPolicy;
    /* Extra data */
    /*
     * STACK_OF(X509_POLICY_DATA) *extra_data;
     */
    unsigned int flags;
};

struct X509_POLICY_TREE_st {
    /* The number of nodes in the tree */
    size_t node_count;
    /* The maximum number of nodes in the tree */
    size_t node_maximum;

    /* This is the tree 'level' data */
    X509_POLICY_LEVEL *levels;
    int nlevel;
    /*
     * Extra policy data when additional nodes (not from the certificate) are
     * required.
     */
    STACK_OF(X509_POLICY_DATA) *extra_data;
    /* This is the authority constrained policy set */
    STACK_OF(X509_POLICY_NODE) *auth_policies;
    STACK_OF(X509_POLICY_NODE) *user_policies;
    unsigned int flags;
};

/* Set if anyPolicy present in user policies */
#define POLICY_FLAG_ANY_POLICY          0x2

/* Useful macros */

#define node_data_critical(data) (data->flags & POLICY_DATA_FLAG_CRITICAL)
#define node_critical(node) node_data_critical(node->data)

/* Internal functions */

X509_POLICY_DATA *ossl_policy_data_new(POLICYINFO *policy, const ASN1_OBJECT *id,
                                       int crit);
void ossl_policy_data_free(X509_POLICY_DATA *data);

X509_POLICY_DATA *ossl_policy_cache_find_data(const X509_POLICY_CACHE *cache,
                                              const ASN1_OBJECT *id);
int ossl_policy_cache_set_mapping(X509 *x, POLICY_MAPPINGS *maps);

STACK_OF(X509_POLICY_NODE) *ossl_policy_node_cmp_new(void);

void ossl_policy_cache_free(X509_POLICY_CACHE *cache);

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 *ossl_policy_tree_find_sk(STACK_OF(X509_POLICY_NODE) *sk,
                                           const ASN1_OBJECT *id);

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);
void ossl_policy_node_free(X509_POLICY_NODE *node);
int ossl_policy_node_match(const X509_POLICY_LEVEL *lvl,
                           const X509_POLICY_NODE *node, const ASN1_OBJECT *oid);

const X509_POLICY_CACHE *ossl_policy_cache_set(X509 *x);
