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/** @file -- VariablePolicyLib.h
Business logic for Variable Policy enforcement.
Copyright (c) Microsoft Corporation.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef _VARIABLE_POLICY_LIB_H_
#define _VARIABLE_POLICY_LIB_H_
#include <Protocol/VariablePolicy.h>
/**
This API function validates and registers a new policy with
the policy enforcement engine.
@param[in] NewPolicy Pointer to the incoming policy structure.
@retval EFI_SUCCESS
@retval EFI_INVALID_PARAMETER NewPolicy is NULL or is internally inconsistent.
@retval EFI_ALREADY_STARTED An identical matching policy already exists.
@retval EFI_WRITE_PROTECTED The interface has been locked until the next reboot.
@retval EFI_UNSUPPORTED Policy enforcement has been disabled. No reason to add more policies.
@retval EFI_ABORTED A calculation error has prevented this function from completing.
@retval EFI_OUT_OF_RESOURCES Cannot grow the table to hold any more policies.
@retval EFI_NOT_READY Library has not yet been initialized.
**/
EFI_STATUS
EFIAPI
RegisterVariablePolicy (
IN CONST VARIABLE_POLICY_ENTRY *NewPolicy
);
/**
This API function checks to see whether the parameters to SetVariable would
be allowed according to the current variable policies.
@param[in] VariableName Same as EFI_SET_VARIABLE.
@param[in] VendorGuid Same as EFI_SET_VARIABLE.
@param[in] Attributes Same as EFI_SET_VARIABLE.
@param[in] DataSize Same as EFI_SET_VARIABLE.
@param[in] Data Same as EFI_SET_VARIABLE.
@retval EFI_SUCCESS A matching policy allows this update.
@retval EFI_SUCCESS There are currently no policies that restrict this update.
@retval EFI_SUCCESS The protections have been disable until the next reboot.
@retval EFI_WRITE_PROTECTED Variable is currently locked.
@retval EFI_INVALID_PARAMETER Attributes or size are invalid.
@retval EFI_ABORTED A lock policy exists, but an error prevented evaluation.
@retval EFI_NOT_READY Library has not been initialized.
**/
EFI_STATUS
EFIAPI
ValidateSetVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN UINT32 Attributes,
IN UINTN DataSize,
IN VOID *Data
);
/**
This API function disables the variable policy enforcement. If it's
already been called once, will return EFI_ALREADY_STARTED.
@retval EFI_SUCCESS
@retval EFI_ALREADY_STARTED Has already been called once this boot.
@retval EFI_WRITE_PROTECTED Interface has been locked until reboot.
@retval EFI_WRITE_PROTECTED Interface option is disabled by platform PCD.
@retval EFI_NOT_READY Library has not yet been initialized.
**/
EFI_STATUS
EFIAPI
DisableVariablePolicy (
VOID
);
/**
This API function will dump the entire contents of the variable policy table.
Similar to GetVariable, the first call can be made with a 0 size and it will return
the size of the buffer required to hold the entire table.
@param[out] Policy Pointer to the policy buffer. Can be NULL if Size is 0.
@param[in,out] Size On input, the size of the output buffer. On output, the size
of the data returned.
@retval EFI_SUCCESS Policy data is in the output buffer and Size has been updated.
@retval EFI_INVALID_PARAMETER Size is NULL, or Size is non-zero and Policy is NULL.
@retval EFI_BUFFER_TOO_SMALL Size is insufficient to hold policy. Size updated with required size.
@retval EFI_NOT_READY Library has not yet been initialized.
**/
EFI_STATUS
EFIAPI
DumpVariablePolicy (
OUT UINT8 *Policy,
IN OUT UINT32 *Size
);
/**
This API function returns whether or not the policy engine is
currently being enforced.
@retval TRUE
@retval FALSE
@retval FALSE Library has not yet been initialized.
**/
BOOLEAN
EFIAPI
IsVariablePolicyEnabled (
VOID
);
/**
This API function locks the interface so that no more policy updates
can be performed or changes made to the enforcement until the next boot.
@retval EFI_SUCCESS
@retval EFI_NOT_READY Library has not yet been initialized.
**/
EFI_STATUS
EFIAPI
LockVariablePolicy (
VOID
);
/**
This API function returns whether or not the policy interface is locked
for the remainder of the boot.
@retval TRUE
@retval FALSE
@retval FALSE Library has not yet been initialized.
**/
BOOLEAN
EFIAPI
IsVariablePolicyInterfaceLocked (
VOID
);
/**
This helper function initializes the library and sets
up any required internal structures or handlers.
Also registers the internal pointer for the GetVariable helper.
@param[in] GetVariableHelper A function pointer matching the EFI_GET_VARIABLE prototype that will be used to
check policy criteria that involve the existence of other variables.
@retval EFI_SUCCESS
@retval EFI_ALREADY_STARTED The initialize function has been called more than once without a call to
deinitialize.
**/
EFI_STATUS
EFIAPI
InitVariablePolicyLib (
IN EFI_GET_VARIABLE GetVariableHelper
);
/**
This helper function returns whether or not the library is currently initialized.
@retval TRUE
@retval FALSE
**/
BOOLEAN
EFIAPI
IsVariablePolicyLibInitialized (
VOID
);
/**
This helper function tears down the library.
Should generally only be used for test harnesses.
@retval EFI_SUCCESS
@retval EFI_NOT_READY Deinitialize was called without first calling initialize.
**/
EFI_STATUS
EFIAPI
DeinitVariablePolicyLib (
VOID
);
#endif // _VARIABLE_POLICY_LIB_H_
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