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fu-efivar.c
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fu-efivar.c
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/*
* Copyright (C) 2018 Richard Hughes <richard@hughsie.com>
* Copyright (C) 2015 Peter Jones <pjones@redhat.com>
*
* SPDX-License-Identifier: LGPL-2.1+
*/
#include "config.h"
#include "fwupd-error.h"
#include "fu-efivar-impl.h"
/**
* fu_efivar_supported:
* @error: #GError
*
* Determines if the kernel supports EFI variables
*
* Returns: %TRUE on success
*
* Since: 1.4.0
**/
gboolean
fu_efivar_supported(GError **error)
{
return fu_efivar_supported_impl(error);
}
/**
* fu_efivar_delete:
* @guid: Globally unique identifier
* @name: Variable name
* @error: #GError
*
* Removes a variable from NVRAM
*
* Returns: %TRUE on success
*
* Since: 1.4.0
**/
gboolean
fu_efivar_delete(const gchar *guid, const gchar *name, GError **error)
{
g_return_val_if_fail(guid != NULL, FALSE);
g_return_val_if_fail(name != NULL, FALSE);
g_return_val_if_fail(error == NULL || *error == NULL, FALSE);
return fu_efivar_delete_impl(guid, name, error);
}
/**
* fu_efivar_delete_with_glob:
* @guid: Globally unique identifier
* @name_glob: Variable name
* @error: #GError
*
* Removes a group of variables from NVRAM
*
* Returns: %TRUE on success
*
* Since: 1.4.0
**/
gboolean
fu_efivar_delete_with_glob(const gchar *guid, const gchar *name_glob, GError **error)
{
g_return_val_if_fail(guid != NULL, FALSE);
g_return_val_if_fail(name_glob != NULL, FALSE);
g_return_val_if_fail(error == NULL || *error == NULL, FALSE);
return fu_efivar_delete_with_glob_impl(guid, name_glob, error);
}
/**
* fu_efivar_exists:
* @guid: Globally unique identifier
* @name: (nullable): Variable name
*
* Test if a variable exists
*
* Returns: %TRUE on success
*
* Since: 1.4.0
**/
gboolean
fu_efivar_exists(const gchar *guid, const gchar *name)
{
g_return_val_if_fail(guid != NULL, FALSE);
return fu_efivar_exists_impl(guid, name);
}
/**
* fu_efivar_get_data:
* @guid: Globally unique identifier
* @name: Variable name
* @data: Data to set
* @data_sz: size of data
* @attr: Attributes
* @error: (nullable): optional return location for an error
*
* Gets the data from a UEFI variable in NVRAM
*
* Returns: %TRUE on success
*
* Since: 1.4.0
**/
gboolean
fu_efivar_get_data(const gchar *guid,
const gchar *name,
guint8 **data,
gsize *data_sz,
guint32 *attr,
GError **error)
{
g_return_val_if_fail(guid != NULL, FALSE);
g_return_val_if_fail(name != NULL, FALSE);
g_return_val_if_fail(error == NULL || *error == NULL, FALSE);
return fu_efivar_get_data_impl(guid, name, data, data_sz, attr, error);
}
/**
* fu_efivar_get_data_bytes:
* @guid: Globally unique identifier
* @name: Variable name
* @attr: (nullable): Attributes
* @error: (nullable): optional return location for an error
*
* Gets the data from a UEFI variable in NVRAM
*
* Returns: (transfer full): a #GBytes, or %NULL
*
* Since: 1.5.0
**/
GBytes *
fu_efivar_get_data_bytes(const gchar *guid, const gchar *name, guint32 *attr, GError **error)
{
guint8 *data = NULL;
gsize datasz = 0;
g_return_val_if_fail(guid != NULL, NULL);
g_return_val_if_fail(name != NULL, NULL);
g_return_val_if_fail(error == NULL || *error == NULL, NULL);
if (!fu_efivar_get_data(guid, name, &data, &datasz, attr, error))
return NULL;
return g_bytes_new_take(data, datasz);
}
/**
* fu_efivar_get_names:
* @guid: Globally unique identifier
* @error: (nullable): optional return location for an error
*
* Gets the list of names where the GUID matches. An error is set if there are
* no names matching the GUID.
*
* Returns: (transfer container) (element-type utf8): array of names
*
* Since: 1.4.7
**/
GPtrArray *
fu_efivar_get_names(const gchar *guid, GError **error)
{
g_return_val_if_fail(guid != NULL, NULL);
g_return_val_if_fail(error == NULL || *error == NULL, NULL);
return fu_efivar_get_names_impl(guid, error);
}
/**
* fu_efivar_get_monitor:
* @guid: Globally unique identifier
* @name: Variable name
* @error: (nullable): optional return location for an error
*
* Returns a file monitor for a specific key.
*
* Returns: (transfer full): a #GFileMonitor, or %NULL for an error
*
* Since: 1.5.5
**/
GFileMonitor *
fu_efivar_get_monitor(const gchar *guid, const gchar *name, GError **error)
{
g_return_val_if_fail(guid != NULL, NULL);
g_return_val_if_fail(name != NULL, NULL);
return fu_efivar_get_monitor_impl(guid, name, error);
}
/**
* fu_efivar_space_used:
* @error: (nullable): optional return location for an error
*
* Gets the total size used by all EFI variables. This may be less than the size reported by the
* kernel as some (hopefully small) variables are hidden from userspace.
*
* Returns: total allocated size of all visible variables, or %G_MAXUINT64 on error
*
* Since: 1.5.1
**/
guint64
fu_efivar_space_used(GError **error)
{
g_return_val_if_fail(error == NULL || *error == NULL, G_MAXUINT64);
return fu_efivar_space_used_impl(error);
}
/**
* fu_efivar_set_data:
* @guid: Globally unique identifier
* @name: Variable name
* @data: Data to set
* @sz: size of @data
* @attr: Attributes
* @error: (nullable): optional return location for an error
*
* Sets the data to a UEFI variable in NVRAM
*
* Returns: %TRUE on success
*
* Since: 1.4.0
**/
gboolean
fu_efivar_set_data(const gchar *guid,
const gchar *name,
const guint8 *data,
gsize sz,
guint32 attr,
GError **error)
{
g_return_val_if_fail(guid != NULL, FALSE);
g_return_val_if_fail(name != NULL, FALSE);
g_return_val_if_fail(data != NULL, FALSE);
g_return_val_if_fail(error == NULL || *error == NULL, FALSE);
return fu_efivar_set_data_impl(guid, name, data, sz, attr, error);
}
/**
* fu_efivar_set_data_bytes:
* @guid: globally unique identifier
* @name: variable name
* @bytes: data blob
* @attr: attributes
* @error: (nullable): optional return location for an error
*
* Sets the data to a UEFI variable in NVRAM
*
* Returns: %TRUE on success
*
* Since: 1.5.0
**/
gboolean
fu_efivar_set_data_bytes(const gchar *guid,
const gchar *name,
GBytes *bytes,
guint32 attr,
GError **error)
{
gsize bufsz = 0;
const guint8 *buf;
g_return_val_if_fail(guid != NULL, FALSE);
g_return_val_if_fail(name != NULL, FALSE);
g_return_val_if_fail(bytes != NULL, FALSE);
g_return_val_if_fail(error == NULL || *error == NULL, FALSE);
buf = g_bytes_get_data(bytes, &bufsz);
return fu_efivar_set_data(guid, name, buf, bufsz, attr, error);
}
/**
* fu_efivar_secure_boot_enabled:
* @error: (nullable): optional return location for an error
*
* Determines if secure boot was enabled
*
* Returns: %TRUE on success
*
* Since: 1.8.2
**/
gboolean
fu_efivar_secure_boot_enabled(GError **error)
{
gsize data_size = 0;
g_autofree guint8 *data = NULL;
g_return_val_if_fail(error == NULL || *error == NULL, FALSE);
if (!fu_efivar_get_data(FU_EFIVAR_GUID_EFI_GLOBAL,
"SecureBoot",
&data,
&data_size,
NULL,
NULL)) {
g_set_error_literal(error,
FWUPD_ERROR,
FWUPD_ERROR_NOT_SUPPORTED,
"SecureBoot is not available");
return FALSE;
}
if (data_size >= 1 && data[0] & 1)
return TRUE;
/* available, but not enabled */
g_set_error_literal(error, FWUPD_ERROR, FWUPD_ERROR_NOT_FOUND, "SecureBoot is not enabled");
return FALSE;
}