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/** @file
Handle TPM 2.0 physical presence requests from OS.
This library will handle TPM 2.0 physical presence request from OS.
Caution: This module requires additional review when modified.
This driver will have external input - variable.
This external input must be validated carefully to avoid security issue.
Tcg2PhysicalPresenceLibSubmitRequestToPreOSFunction() and Tcg2PhysicalPresenceLibGetUserConfirmationStatusFunction()
will receive untrusted input and do validation.
Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <PiSmm.h>
#include <Guid/Tcg2PhysicalPresenceData.h>
#include <Protocol/SmmVariable.h>
#include <Library/DebugLib.h>
#include <Library/Tcg2PpVendorLib.h>
#include <Library/SmmServicesTableLib.h>
EFI_SMM_VARIABLE_PROTOCOL *mTcg2PpSmmVariable;
/**
The handler for TPM physical presence function:
Return TPM Operation Response to OS Environment.
This API should be invoked in OS runtime phase to interface with ACPI method.
@param[out] MostRecentRequest Most recent operation request.
@param[out] Response Response to the most recent operation request.
@return Return Code for Return TPM Operation Response to OS Environment.
**/
UINT32
EFIAPI
Tcg2PhysicalPresenceLibReturnOperationResponseToOsFunction (
OUT UINT32 *MostRecentRequest,
OUT UINT32 *Response
)
{
EFI_STATUS Status;
UINTN DataSize;
EFI_TCG2_PHYSICAL_PRESENCE PpData;
DEBUG ((EFI_D_INFO, "[TPM2] ReturnOperationResponseToOsFunction\n"));
//
// Get the Physical Presence variable
//
DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE);
Status = mTcg2PpSmmVariable->SmmGetVariable (
TCG2_PHYSICAL_PRESENCE_VARIABLE,
&gEfiTcg2PhysicalPresenceGuid,
NULL,
&DataSize,
&PpData
);
if (EFI_ERROR (Status)) {
*MostRecentRequest = 0;
*Response = 0;
DEBUG ((EFI_D_ERROR, "[TPM2] Get PP variable failure! Status = %r\n", Status));
return TCG_PP_RETURN_TPM_OPERATION_RESPONSE_FAILURE;
}
*MostRecentRequest = PpData.LastPPRequest;
*Response = PpData.PPResponse;
return TCG_PP_RETURN_TPM_OPERATION_RESPONSE_SUCCESS;
}
/**
The handler for TPM physical presence function:
Submit TPM Operation Request to Pre-OS Environment and
Submit TPM Operation Request to Pre-OS Environment 2.
This API should be invoked in OS runtime phase to interface with ACPI method.
Caution: This function may receive untrusted input.
@param[in] OperationRequest TPM physical presence operation request.
@param[in] RequestParameter TPM physical presence operation request parameter.
@return Return Code for Submit TPM Operation Request to Pre-OS Environment and
Submit TPM Operation Request to Pre-OS Environment 2.
**/
UINT32
EFIAPI
Tcg2PhysicalPresenceLibSubmitRequestToPreOSFunction (
IN UINT32 OperationRequest,
IN UINT32 RequestParameter
)
{
EFI_STATUS Status;
UINTN DataSize;
EFI_TCG2_PHYSICAL_PRESENCE PpData;
EFI_TCG2_PHYSICAL_PRESENCE_FLAGS Flags;
DEBUG ((EFI_D_INFO, "[TPM2] SubmitRequestToPreOSFunction, Request = %x, %x\n", OperationRequest, RequestParameter));
//
// Get the Physical Presence variable
//
DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE);
Status = mTcg2PpSmmVariable->SmmGetVariable (
TCG2_PHYSICAL_PRESENCE_VARIABLE,
&gEfiTcg2PhysicalPresenceGuid,
NULL,
&DataSize,
&PpData
);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "[TPM2] Get PP variable failure! Status = %r\n", Status));
return TCG_PP_SUBMIT_REQUEST_TO_PREOS_GENERAL_FAILURE;
}
if ((OperationRequest > TCG2_PHYSICAL_PRESENCE_NO_ACTION_MAX) &&
(OperationRequest < TCG2_PHYSICAL_PRESENCE_VENDOR_SPECIFIC_OPERATION) ) {
//
// This command requires UI to prompt user for Auth data.
//
return TCG_PP_SUBMIT_REQUEST_TO_PREOS_NOT_IMPLEMENTED;
}
if (PpData.PPRequest != OperationRequest) {
PpData.PPRequest = (UINT8)OperationRequest;
PpData.PPRequestParameter = RequestParameter;
DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE);
Status = mTcg2PpSmmVariable->SmmSetVariable (
TCG2_PHYSICAL_PRESENCE_VARIABLE,
&gEfiTcg2PhysicalPresenceGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
DataSize,
&PpData
);
}
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "[TPM2] Set PP variable failure! Status = %r\n", Status));
return TCG_PP_SUBMIT_REQUEST_TO_PREOS_GENERAL_FAILURE;
}
if (OperationRequest >= TCG2_PHYSICAL_PRESENCE_VENDOR_SPECIFIC_OPERATION) {
DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE_FLAGS);
Status = mTcg2PpSmmVariable->SmmGetVariable (
TCG2_PHYSICAL_PRESENCE_FLAGS_VARIABLE,
&gEfiTcg2PhysicalPresenceGuid,
NULL,
&DataSize,
&Flags
);
if (EFI_ERROR (Status)) {
Flags.PPFlags = TCG2_BIOS_TPM_MANAGEMENT_FLAG_DEFAULT;
}
return Tcg2PpVendorLibSubmitRequestToPreOSFunction (OperationRequest, Flags.PPFlags, RequestParameter);
}
return TCG_PP_SUBMIT_REQUEST_TO_PREOS_SUCCESS;
}
/**
The handler for TPM physical presence function:
Get User Confirmation Status for Operation.
This API should be invoked in OS runtime phase to interface with ACPI method.
Caution: This function may receive untrusted input.
@param[in] OperationRequest TPM physical presence operation request.
@return Return Code for Get User Confirmation Status for Operation.
**/
UINT32
EFIAPI
Tcg2PhysicalPresenceLibGetUserConfirmationStatusFunction (
IN UINT32 OperationRequest
)
{
EFI_STATUS Status;
UINTN DataSize;
EFI_TCG2_PHYSICAL_PRESENCE PpData;
EFI_TCG2_PHYSICAL_PRESENCE_FLAGS Flags;
BOOLEAN RequestConfirmed;
DEBUG ((EFI_D_INFO, "[TPM2] GetUserConfirmationStatusFunction, Request = %x\n", OperationRequest));
//
// Get the Physical Presence variable
//
DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE);
Status = mTcg2PpSmmVariable->SmmGetVariable (
TCG2_PHYSICAL_PRESENCE_VARIABLE,
&gEfiTcg2PhysicalPresenceGuid,
NULL,
&DataSize,
&PpData
);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "[TPM2] Get PP variable failure! Status = %r\n", Status));
return TCG_PP_GET_USER_CONFIRMATION_BLOCKED_BY_BIOS_CONFIGURATION;
}
//
// Get the Physical Presence flags
//
DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE_FLAGS);
Status = mTcg2PpSmmVariable->SmmGetVariable (
TCG2_PHYSICAL_PRESENCE_FLAGS_VARIABLE,
&gEfiTcg2PhysicalPresenceGuid,
NULL,
&DataSize,
&Flags
);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "[TPM2] Get PP flags failure! Status = %r\n", Status));
return TCG_PP_GET_USER_CONFIRMATION_BLOCKED_BY_BIOS_CONFIGURATION;
}
RequestConfirmed = FALSE;
switch (OperationRequest) {
case TCG2_PHYSICAL_PRESENCE_CLEAR:
case TCG2_PHYSICAL_PRESENCE_ENABLE_CLEAR:
case TCG2_PHYSICAL_PRESENCE_ENABLE_CLEAR_2:
case TCG2_PHYSICAL_PRESENCE_ENABLE_CLEAR_3:
if ((Flags.PPFlags & TCG2_BIOS_TPM_MANAGEMENT_FLAG_PP_REQUIRED_FOR_CLEAR) == 0) {
RequestConfirmed = TRUE;
}
break;
case TCG2_PHYSICAL_PRESENCE_SET_PP_REQUIRED_FOR_CLEAR_TRUE:
RequestConfirmed = TRUE;
break;
case TCG2_PHYSICAL_PRESENCE_SET_PP_REQUIRED_FOR_CLEAR_FALSE:
break;
case TCG2_PHYSICAL_PRESENCE_SET_PCR_BANKS:
if ((Flags.PPFlags & TCG2_BIOS_TPM_MANAGEMENT_FLAG_PP_REQUIRED_FOR_CHANGE_PCRS) == 0) {
RequestConfirmed = TRUE;
}
break;
case TCG2_PHYSICAL_PRESENCE_CHANGE_EPS:
if ((Flags.PPFlags & TCG2_BIOS_TPM_MANAGEMENT_FLAG_PP_REQUIRED_FOR_CHANGE_EPS) == 0) {
RequestConfirmed = TRUE;
}
break;
case TCG2_PHYSICAL_PRESENCE_LOG_ALL_DIGESTS:
RequestConfirmed = TRUE;
break;
default:
if (OperationRequest <= TCG2_PHYSICAL_PRESENCE_NO_ACTION_MAX) {
RequestConfirmed = TRUE;
} else {
if (OperationRequest < TCG2_PHYSICAL_PRESENCE_VENDOR_SPECIFIC_OPERATION) {
return TCG_PP_GET_USER_CONFIRMATION_NOT_IMPLEMENTED;
}
}
break;
}
if (OperationRequest >= TCG2_PHYSICAL_PRESENCE_VENDOR_SPECIFIC_OPERATION) {
return Tcg2PpVendorLibGetUserConfirmationStatusFunction (OperationRequest, Flags.PPFlags);
}
if (RequestConfirmed) {
return TCG_PP_GET_USER_CONFIRMATION_ALLOWED_AND_PPUSER_NOT_REQUIRED;
} else {
return TCG_PP_GET_USER_CONFIRMATION_ALLOWED_AND_PPUSER_REQUIRED;
}
}
/**
The constructor function register UNI strings into imageHandle.
It will ASSERT() if that operation fails and it will always return EFI_SUCCESS.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The constructor successfully added string package.
@retval Other value The constructor can't add string package.
**/
EFI_STATUS
EFIAPI
Tcg2PhysicalPresenceLibConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
//
// Locate SmmVariableProtocol.
//
Status = gSmst->SmmLocateProtocol (&gEfiSmmVariableProtocolGuid, NULL, (VOID**)&mTcg2PpSmmVariable);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
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