Contributors: 1
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/* SPDX-License-Identifier: GPL-2.0
 *
 * Definitions for kernel modules using hp_bioscfg driver
 *
 *  Copyright (c) 2022 HP Development Company, L.P.
 */

#ifndef _HP_BIOSCFG_H_
#define _HP_BIOSCFG_H_

#include <linux/wmi.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/nls.h>

#define DRIVER_NAME		"hp-bioscfg"

#define MAX_BUFF_SIZE		512
#define MAX_KEY_MOD_SIZE	256
#define MAX_PASSWD_SIZE		64
#define MAX_PREREQUISITES_SIZE	20
#define MAX_REQ_ELEM_SIZE	128
#define MAX_VALUES_SIZE		16
#define MAX_ENCODINGS_SIZE	16
#define MAX_ELEMENTS_SIZE	16

#define SPM_STR_DESC		"Secure Platform Management"
#define SPM_STR			"SPM"
#define SURE_START_DESC		"Sure Start"
#define SURE_START_STR		"Sure_Start"
#define SETUP_PASSWD		"Setup Password"
#define POWER_ON_PASSWD		"Power-On Password"

#define LANG_CODE_STR		"en_US.UTF-8"
#define SCHEDULE_POWER_ON	"Scheduled Power-On"

#define COMMA_SEP		","
#define SEMICOLON_SEP		";"

/* Sure Admin Functions */

#define UTF_PREFIX		"<utf-16/>"
#define BEAM_PREFIX		"<BEAM/>"

enum mechanism_values {
	PASSWORD		= 0x00,
	SIGNING_KEY		= 0x01,
	ENDORSEMENT_KEY		= 0x02,
};

#define BIOS_ADMIN		"bios-admin"
#define POWER_ON		"power-on"
#define BIOS_SPM		"enhanced-bios-auth"

#define PASSWD_MECHANISM_TYPES "password"

#define HP_WMI_BIOS_GUID		"5FB7F034-2C63-45e9-BE91-3D44E2C707E4"

#define HP_WMI_BIOS_STRING_GUID		"988D08E3-68F4-4c35-AF3E-6A1B8106F83C"
#define HP_WMI_BIOS_INTEGER_GUID	"8232DE3D-663D-4327-A8F4-E293ADB9BF05"
#define HP_WMI_BIOS_ENUMERATION_GUID	"2D114B49-2DFB-4130-B8FE-4A3C09E75133"
#define HP_WMI_BIOS_ORDERED_LIST_GUID	"14EA9746-CE1F-4098-A0E0-7045CB4DA745"
#define HP_WMI_BIOS_PASSWORD_GUID	"322F2028-0F84-4901-988E-015176049E2D"
#define HP_WMI_SET_BIOS_SETTING_GUID	"1F4C91EB-DC5C-460b-951D-C7CB9B4B8D5E"

enum hp_wmi_spm_commandtype {
	HPWMI_SECUREPLATFORM_GET_STATE  = 0x10,
	HPWMI_SECUREPLATFORM_SET_KEK	= 0x11,
	HPWMI_SECUREPLATFORM_SET_SK	= 0x12,
};

enum hp_wmi_surestart_commandtype {
	HPWMI_SURESTART_GET_LOG_COUNT	= 0x01,
	HPWMI_SURESTART_GET_LOG		= 0x02,
};

enum hp_wmi_command {
	HPWMI_READ		= 0x01,
	HPWMI_WRITE		= 0x02,
	HPWMI_ODM		= 0x03,
	HPWMI_SURESTART		= 0x20006,
	HPWMI_GM		= 0x20008,
	HPWMI_SECUREPLATFORM	= 0x20010,
};

struct bios_return {
	u32 sigpass;
	u32 return_code;
};

enum wmi_error_values {
	SUCCESS				= 0x00,
	CMD_FAILED			= 0x01,
	INVALID_SIGN			= 0x02,
	INVALID_CMD_VALUE		= 0x03,
	INVALID_CMD_TYPE		= 0x04,
	INVALID_DATA_SIZE		= 0x05,
	INVALID_CMD_PARAM		= 0x06,
	ENCRYP_CMD_REQUIRED		= 0x07,
	NO_SECURE_SESSION		= 0x08,
	SECURE_SESSION_FOUND		= 0x09,
	SECURE_SESSION_FAILED		= 0x0A,
	AUTH_FAILED			= 0x0B,
	INVALID_BIOS_AUTH		= 0x0E,
	NONCE_DID_NOT_MATCH		= 0x18,
	GENERIC_ERROR			= 0x1C,
	BIOS_ADMIN_POLICY_NOT_MET	= 0x28,
	BIOS_ADMIN_NOT_SET		= 0x38,
	P21_NO_PROVISIONED		= 0x1000,
	P21_PROVISION_IN_PROGRESS	= 0x1001,
	P21_IN_USE			= 0x1002,
	HEP_NOT_ACTIVE			= 0x1004,
	HEP_ALREADY_SET			= 0x1006,
	HEP_CHECK_STATE			= 0x1007,
};

struct common_data {
	u8 display_name[MAX_BUFF_SIZE];
	u8 path[MAX_BUFF_SIZE];
	u32 is_readonly;
	u32 display_in_ui;
	u32 requires_physical_presence;
	u32 sequence;
	u32 prerequisites_size;
	u8 prerequisites[MAX_PREREQUISITES_SIZE][MAX_BUFF_SIZE];
	u32 security_level;
};

struct string_data {
	struct common_data common;
	struct kobject *attr_name_kobj;
	u8 current_value[MAX_BUFF_SIZE];
	u8 new_value[MAX_BUFF_SIZE];
	u32 min_length;
	u32 max_length;
};

struct integer_data {
	struct common_data common;
	struct kobject *attr_name_kobj;
	u32 current_value;
	u32 new_value;
	u32 lower_bound;
	u32 upper_bound;
	u32 scalar_increment;
};

struct enumeration_data {
	struct common_data common;
	struct kobject *attr_name_kobj;
	u8 current_value[MAX_BUFF_SIZE];
	u8 new_value[MAX_BUFF_SIZE];
	u32 possible_values_size;
	u8 possible_values[MAX_VALUES_SIZE][MAX_BUFF_SIZE];
};

struct ordered_list_data {
	struct common_data common;
	struct kobject *attr_name_kobj;
	u8 current_value[MAX_BUFF_SIZE];
	u8 new_value[MAX_BUFF_SIZE];
	u32 elements_size;
	u8 elements[MAX_ELEMENTS_SIZE][MAX_BUFF_SIZE];
};

struct password_data {
	struct common_data common;
	struct kobject *attr_name_kobj;
	u8 current_password[MAX_PASSWD_SIZE];
	u8 new_password[MAX_PASSWD_SIZE];
	u32 min_password_length;
	u32 max_password_length;
	u32 encodings_size;
	u8 encodings[MAX_ENCODINGS_SIZE][MAX_BUFF_SIZE];
	bool is_enabled;

	/*
	 * 'role' identifies the type of authentication.
	 * Two known types are bios-admin and power-on.
	 * 'bios-admin' represents BIOS administrator password
	 * 'power-on' represents a password required to use the system
	 */
	u32 role;

	/*
	 * 'mechanism' represents the means of authentication.
	 * Only supported type currently is "password"
	 */
	u32 mechanism;
};

struct secure_platform_data {
	struct kobject *attr_name_kobj;
	u8 attribute_name[MAX_BUFF_SIZE];
	u8 *endorsement_key;
	u8 *signing_key;
	u8 *auth_token;
	bool is_enabled;
	u32 mechanism;
};

struct bioscfg_priv {
	struct kset *authentication_dir_kset;
	struct kset *main_dir_kset;
	struct device *class_dev;
	struct string_data *string_data;
	u32 string_instances_count;
	struct integer_data *integer_data;
	u32 integer_instances_count;
	struct enumeration_data *enumeration_data;
	u32 enumeration_instances_count;
	struct ordered_list_data *ordered_list_data;
	u32 ordered_list_instances_count;
	struct password_data *password_data;
	u32 password_instances_count;

	struct kobject *sure_start_attr_kobj;
	struct secure_platform_data spm_data;
	u8 display_name_language_code[MAX_BUFF_SIZE];
	bool pending_reboot;
	struct mutex mutex;
};

/* global structure used by multiple WMI interfaces */
extern struct bioscfg_priv bioscfg_drv;

enum hp_wmi_data_type {
	HPWMI_STRING_TYPE,
	HPWMI_INTEGER_TYPE,
	HPWMI_ENUMERATION_TYPE,
	HPWMI_ORDERED_LIST_TYPE,
	HPWMI_PASSWORD_TYPE,
	HPWMI_SECURE_PLATFORM_TYPE,
	HPWMI_SURE_START_TYPE,
};

enum hp_wmi_data_elements {
	/* Common elements */
	NAME = 0,
	VALUE = 1,
	PATH = 2,
	IS_READONLY = 3,
	DISPLAY_IN_UI = 4,
	REQUIRES_PHYSICAL_PRESENCE = 5,
	SEQUENCE = 6,
	PREREQUISITES_SIZE = 7,
	PREREQUISITES = 8,
	SECURITY_LEVEL = 9,

	/* String elements */
	STR_MIN_LENGTH = 10,
	STR_MAX_LENGTH = 11,
	STR_ELEM_CNT = 12,

	/* Integer elements */
	INT_LOWER_BOUND = 10,
	INT_UPPER_BOUND = 11,
	INT_SCALAR_INCREMENT = 12,
	INT_ELEM_CNT = 13,

	/* Enumeration elements */
	ENUM_CURRENT_VALUE = 10,
	ENUM_SIZE = 11,
	ENUM_POSSIBLE_VALUES = 12,
	ENUM_ELEM_CNT = 13,

	/* Ordered list elements */
	ORD_LIST_SIZE = 10,
	ORD_LIST_ELEMENTS = 11,
	ORD_ELEM_CNT = 12,

	/* Password elements */
	PSWD_MIN_LENGTH = 10,
	PSWD_MAX_LENGTH = 11,
	PSWD_SIZE = 12,
	PSWD_ENCODINGS = 13,
	PSWD_IS_SET = 14,
	PSWD_ELEM_CNT = 15,
};

#define GET_INSTANCE_ID(type)						\
	static int get_##type##_instance_id(struct kobject *kobj)	\
	{								\
		int i;							\
									\
		for (i = 0; i <= bioscfg_drv.type##_instances_count; i++) { \
			if (!strcmp(kobj->name, bioscfg_drv.type##_data[i].attr_name_kobj->name)) \
				return i;				\
		}							\
		return -EIO;						\
	}

#define ATTRIBUTE_S_PROPERTY_SHOW(name, type)				\
	static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, \
				   char *buf)				\
	{								\
		int i = get_##type##_instance_id(kobj);			\
		if (i >= 0)						\
			return sysfs_emit(buf, "%s\n", bioscfg_drv.type##_data[i].name); \
		return -EIO;						\
	}

#define ATTRIBUTE_N_PROPERTY_SHOW(name, type)				\
	static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, \
				   char *buf)				\
	{								\
		int i = get_##type##_instance_id(kobj);			\
		if (i >= 0)						\
			return sysfs_emit(buf, "%d\n", bioscfg_drv.type##_data[i].name); \
		return -EIO;						\
	}

#define ATTRIBUTE_PROPERTY_STORE(curr_val, type)			\
	static ssize_t curr_val##_store(struct kobject *kobj,		\
					struct kobj_attribute *attr,	\
					const char *buf, size_t count)	\
	{								\
		char *attr_value = NULL;				\
		int i;							\
		int ret = -EIO;						\
									\
		attr_value = kstrdup(buf, GFP_KERNEL);			\
		if (!attr_value)					\
			return -ENOMEM;					\
									\
		ret = hp_enforce_single_line_input(attr_value, count);	\
		if (!ret) {						\
			i = get_##type##_instance_id(kobj);		\
			if (i >= 0)					\
				ret = validate_##type##_input(i, attr_value); \
		}							\
		if (!ret)						\
			ret = hp_set_attribute(kobj->name, attr_value);	\
		if (!ret) {						\
			update_##type##_value(i, attr_value);		\
			if (bioscfg_drv.type##_data[i].common.requires_physical_presence)	\
				hp_set_reboot_and_signal_event();	\
		}							\
		hp_clear_all_credentials();				\
		kfree(attr_value);					\
									\
		return ret ? ret : count;				\
	}

#define ATTRIBUTE_SPM_N_PROPERTY_SHOW(name, type)			\
	static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) \
	{								\
		return sysfs_emit(buf, "%d\n", bioscfg_drv.type##_data.name); \
	}

#define ATTRIBUTE_SPM_S_PROPERTY_SHOW(name, type)			\
	static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) \
	{								\
		return sysfs_emit(buf, "%s\n", bioscfg_drv.type##_data.name); \
	}

#define ATTRIBUTE_VALUES_PROPERTY_SHOW(name, type, sep)			\
	static ssize_t name##_show(struct kobject *kobj,		\
				   struct kobj_attribute *attr, char *buf) \
	{								\
		int i;							\
		int len = 0;						\
		int instance_id = get_##type##_instance_id(kobj);	\
									\
		if (instance_id < 0)					\
			return 0;					\
									\
		for (i = 0; i < bioscfg_drv.type##_data[instance_id].name##_size; i++) { \
			if (i)						\
				len += sysfs_emit_at(buf, len, "%s", sep); \
									\
			len += sysfs_emit_at(buf, len, "%s",		\
					     bioscfg_drv.type##_data[instance_id].name[i]); \
		}							\
		len += sysfs_emit_at(buf, len, "\n");			\
		return len;						\
	}

#define ATTRIBUTE_S_COMMON_PROPERTY_SHOW(name, type)		\
	static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, \
				   char *buf)				\
	{								\
		int i = get_##type##_instance_id(kobj);			\
		if (i >= 0)						\
			return sysfs_emit(buf, "%s\n", bioscfg_drv.type##_data[i].common.name); \
		return -EIO;						\
	}

extern struct kobj_attribute common_display_langcode;

/* Prototypes */

/* String attributes */
int hp_populate_string_buffer_data(u8 *buffer_ptr, u32 *buffer_size,
				   int instance_id,
				   struct kobject *attr_name_kobj);
int hp_alloc_string_data(void);
void hp_exit_string_attributes(void);
int hp_populate_string_package_data(union acpi_object *str_obj,
				    int instance_id,
				    struct kobject *attr_name_kobj);

/* Integer attributes */
int hp_populate_integer_buffer_data(u8 *buffer_ptr, u32 *buffer_size,
				    int instance_id,
				    struct kobject *attr_name_kobj);
int hp_alloc_integer_data(void);
void hp_exit_integer_attributes(void);
int hp_populate_integer_package_data(union acpi_object *integer_obj,
				     int instance_id,
				     struct kobject *attr_name_kobj);

/* Enumeration attributes */
int hp_populate_enumeration_buffer_data(u8 *buffer_ptr, u32 *buffer_size,
					int instance_id,
					struct kobject *attr_name_kobj);
int hp_alloc_enumeration_data(void);
void hp_exit_enumeration_attributes(void);
int hp_populate_enumeration_package_data(union acpi_object *enum_obj,
					 int instance_id,
					 struct kobject *attr_name_kobj);

/* Ordered list */
int hp_populate_ordered_list_buffer_data(u8 *buffer_ptr,
					 u32 *buffer_size,
					 int instance_id,
					 struct kobject *attr_name_kobj);
int hp_alloc_ordered_list_data(void);
void hp_exit_ordered_list_attributes(void);
int hp_populate_ordered_list_package_data(union acpi_object *order_obj,
					  int instance_id,
					  struct kobject *attr_name_kobj);

/* Password authentication attributes */
int hp_populate_password_buffer_data(u8 *buffer_ptr, u32 *buffer_size,
				     int instance_id,
				     struct kobject *attr_name_kobj);
int hp_populate_password_package_data(union acpi_object *password_obj,
				      int instance_id,
				      struct kobject *attr_name_kobj);
int hp_alloc_password_data(void);
int hp_get_password_instance_for_type(const char *name);
int hp_clear_all_credentials(void);
int hp_set_attribute(const char *a_name, const char *a_value);

/* SPM attributes */
void hp_exit_password_attributes(void);
void hp_exit_secure_platform_attributes(void);
int hp_populate_secure_platform_data(struct kobject *attr_name_kobj);
int hp_populate_security_buffer(u16 *buffer, const char *authentication);

/* Bios Attributes interface */
int hp_wmi_set_bios_setting(u16 *input_buffer, u32 input_size);
int hp_wmi_perform_query(int query, enum hp_wmi_command command,
			 void *buffer, u32 insize, u32 outsize);

/* Sure Start attributes */
void hp_exit_sure_start_attributes(void);
int hp_populate_sure_start_data(struct kobject *attr_name_kobj);

/* Bioscfg */

void hp_exit_attr_set_interface(void);
int hp_init_attr_set_interface(void);
size_t hp_calculate_string_buffer(const char *str);
size_t hp_calculate_security_buffer(const char *authentication);
void *hp_ascii_to_utf16_unicode(u16 *p, const u8 *str);
int hp_get_integer_from_buffer(u8 **buffer, u32 *buffer_size, u32 *integer);
int hp_get_string_from_buffer(u8 **buffer, u32 *buffer_size, char *dst, u32 dst_size);
int hp_convert_hexstr_to_str(const char *input, u32 input_len, char **str, int *len);
int hp_encode_outsize_for_pvsz(int outsize);
int hp_enforce_single_line_input(char *buf, size_t count);
void hp_set_reboot_and_signal_event(void);
ssize_t display_name_language_code_show(struct kobject *kobj,
					struct kobj_attribute *attr,
					char *buf);
union acpi_object *hp_get_wmiobj_pointer(int instance_id, const char *guid_string);
int hp_get_instance_count(const char *guid_string);
void hp_update_attribute_permissions(bool isreadonly, struct kobj_attribute *current_val);
void hp_friendly_user_name_update(char *path, const char *attr_name,
				  char *attr_display, int attr_size);
int hp_wmi_error_and_message(int error_code);
int hp_get_common_data_from_buffer(u8 **buffer_ptr, u32 *buffer_size, struct common_data *common);

#endif