/* SPDX-License-Identifier: BSD-2-Clause */
/*******************************************************************************
 * Copyright 2018-2019, Fraunhofer SIT sponsored by Infineon Technologies AG
 * All rights reserved.
 *******************************************************************************/
#ifndef FAPI_POLICY_EXECUTE_H
#define FAPI_POLICY_EXECUTE_H

#include <stdint.h>
#include <stdarg.h>
#include <stdbool.h>
#include <sys/stat.h>
#include <json-c/json.h>
#include <json-c/json_util.h>

#include "tss2_esys.h"
#include "tss2_fapi.h"

TSS2_RC
ifapi_extend_authorization(
    TPMS_POLICY *policy,
    TPMS_POLICYAUTHORIZATION *authorization);

typedef TSS2_RC(*Policy_Compare_Object)(
    TPMS_POLICY *policy,
    void *object1,
    void *object2,
    bool *found);

/** List of policies which fulfill a certain predicate.
 *
 * The elements are stored in a linked list.
 */
struct POLICY_LIST {
    const char *path;            /**< The path of the policy object */
    TPMS_POLICY policy;          /**< The policy object */
    struct POLICY_LIST *next;    /**< Pointer to next element */
};

/** List of policies which fulfill a certain predicate.
 *
 * The elements are stored in a linked list.
 */
struct policy_object_node {
    const char *path;                  /**< The path of the policy object */
    TPMS_POLICY policy;                /**< The policy object */
    struct policy_object_node *next;   /**< Pointer to next element */
};

typedef TSS2_RC (*ifapi_policyexec_cbauth) (
    TPM2B_NAME *name,
    ESYS_TR *object_handle,
    ESYS_TR *auth_handle,
    ESYS_TR *authSession,
    void *userdata);

typedef TSS2_RC (*ifapi_policyexec_cbdup) (
    TPM2B_NAME *name,
    void *userdata);

typedef TSS2_RC (*ifapi_policyexec_cbpolsel) (
    TPML_POLICYBRANCHES *branches,
    size_t *branch_idx,
    void *userdata);

typedef TSS2_RC (*ifapi_policyexec_cbsign) (
    char *key_pem,
    char *public_key_hint,
    TPMI_ALG_HASH key_pem_hash_alg,
    uint8_t *buffer,
    size_t buffer_size,
    uint8_t **signature,
    size_t *signature_size,
    void *userdata);

typedef TSS2_RC (*ifapi_policyexec_cbauthpol) (
    TPMT_PUBLIC *key_public,
    TPMI_ALG_HASH hash_alg,
    TPM2B_DIGEST *digest,
    TPMT_SIGNATURE *signature,
    void *userdata);

typedef TSS2_RC (*ifapi_policyexec_cbauthnv) (
    TPM2B_NV_PUBLIC *nv_public,
    TPMI_ALG_HASH hash_alg,
    void *userdata);

typedef TSS2_RC (*ifapi_policyexec_cbaction) (
    const char *action,
    void *userdata);

typedef struct {
    ifapi_policyexec_cbauth               cbauth; /**< Callback to authorize an object
                                                       retrieved by name in keystore */
    void                        *cbauth_userdata;
    ifapi_policyexec_cbpolsel           cbpolsel; /**< Callback for selection of policy
                                                       branch */
    void                      *cbpolsel_userdata;
    ifapi_policyexec_cbsign               cbsign; /**< Callback for policy sign */
    void                        *cbsign_userdata;
    ifapi_policyexec_cbauthpol         cbauthpol; /**< Callback for policy authorize */
    void                     *cbauthpol_userdata;
    ifapi_policyexec_cbauthnv           cbauthnv; /**< Callback for policy authorize nv */
    void                      *cbauthnv_userdata;
    ifapi_policyexec_cbdup                 cbdup; /**< Callback for policy duplication
                                                       select */
    void                         *cbdup_userdata;
    ifapi_policyexec_cbaction           cbaction; /**< Callback for policy action */
    void                      *cbaction_userdata;
} ifapi_policyeval_EXEC_CB;

/** The states for policy execution */
enum IFAPI_STATE_POLICY_EXCECUTE {
    POLICY_EXECUTE_INIT = 0,
    POLICY_EXECUTE_FINISH,
    POLICY_EXECUTE_CALLBACK,
    POLICY_LOAD_KEY,
    POLICY_FLUSH_KEY,
    POLICY_VERIFY,
    POLICY_AUTH_CALLBACK,
    POLICY_AUTH_SENT,
    POLICY_EXEC_ESYS
};

typedef struct IFAPI_POLICY_CALLBACK_CTX IFAPI_POLICY_CALLBACK_CTX;

/** The context of the policy execution */
struct IFAPI_POLICY_EXEC_CTX {
    enum IFAPI_STATE_POLICY_EXCECUTE state;
                                    /**< The execution state of the current
                                         policy command */
    TPML_DIGEST digest_list;        /** The digest list of policy or */
    IFAPI_POLICY_EXEC_CTX *next;    /**< Pointer to next policy */
    IFAPI_POLICY_EXEC_CTX *prev;    /**< Pointer to previous policy */
    ESYS_TR session;                /**< The current policy session */
    TPMS_POLICY *policy;
    ESYS_TR policySessionSav;       /**< Backup policy session */
    ESYS_TR object_handle;
    ESYS_TR nv_index;
    ESYS_TR auth_handle;
    IFAPI_OBJECT auth_object;       /**< Object used for authentication */
    ESYS_TR auth_session;
    TPMI_ALG_HASH hash_alg;
    void  *app_data;                /**< Application data  for policy execution callbacks */
    NODE_OBJECT_T *policy_elements; /**< The policy elements to be executed */
    TPM2B_DIGEST *nonceTPM;
    uint8_t *buffer;
    size_t buffer_size;
    TPM2B_NAME name;
    char *pem_key;                   /**< Pem key recreated during policy execution */
    struct POLICY_LIST *policy_list;
                                    /**< List of policies for authorization selection */
    ifapi_policyeval_EXEC_CB callbacks;
                                    /**< callbacks used for execution of sub
                                         policies and actions which require access
                                         to the FAPI context. */
};

TSS2_RC
ifapi_policyeval_execute_prepare(
    IFAPI_POLICY_EXEC_CTX *pol_ctx,
    TPMI_ALG_HASH hash_alg,
    TPMS_POLICY *policy);

TSS2_RC
ifapi_policyeval_execute(
    ESYS_CONTEXT *esys_ctx,
    IFAPI_POLICY_EXEC_CTX *current_policy);

#endif /* FAPI_POLICY_EXECUTE_H */