DxeSecurityManagementLib.c revision 4fd606d1f5abe38e1f42c38de1d2e895166bd0f4
/** @file
Provides generic security measurement functions for DXE module.
Copyright (c) 2009, 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
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 <PiDxe.h>
#include <Library/DebugLib.h>
#include <Library/DxeServicesLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/SecurityManagementLib.h>
#define SECURITY_HANDLER_TABLE_SIZE 0x10
typedef struct {
/**
Reallocates more global memory to store the registered Handler list.
@retval RETURN_SUCCESS Reallocate memory successfully.
@retval RETURN_OUT_OF_RESOURCES No enough memory to allocated.
**/
)
{
//
// Reallocate memory for security info structure.
//
mMaxNumberOfSecurityHandler * sizeof (SECURITY_INFO),
);
//
// No enough resource is allocated.
//
if (mSecurityTable == NULL) {
return RETURN_OUT_OF_RESOURCES;
}
//
// Increase max handler number
//
return RETURN_SUCCESS;
}
/**
Check whether an operation is valid according to the requirement of current operation,
which must make sure that the measure image operation is the last one.
@param CurrentAuthOperation Current operation.
@param CheckAuthOperation Operation to be checked.
@retval TRUE Operation is valid for current operation.
@retval FALSE Operation is invalid for current operation.
**/
)
{
//
// Make sure new auth operation can be recognized.
//
ASSERT ((CheckAuthOperation & ~(EFI_AUTH_OPERATION_MASK | EFI_AUTH_OPERATION_IMAGE_REQUIRED)) == 0);
//
// When current operation includes measure image operation,
// only another measure image operation or none operation will be allowed.
//
if ((CurrentAuthOperation & EFI_AUTH_OPERATION_MEASURE_IMAGE) == EFI_AUTH_OPERATION_MEASURE_IMAGE) {
if (((CheckAuthOperation & EFI_AUTH_OPERATION_MEASURE_IMAGE) == EFI_AUTH_OPERATION_MEASURE_IMAGE) ||
return TRUE;
} else {
return FALSE;
}
}
//
// When current operation doesn't include measure image operation,
// any new operation will be allowed.
//
return TRUE;
}
/**
Register security measurement handler with its operation type. The different
handler with the same operation can all be registered.
If SecurityHandler is NULL, then ASSERT().
If no enough resources available to register new handler, then ASSERT().
If AuthenticationOperation is not recongnized, then ASSERT().
If the previous register handler can't be executed before the later register handler, then ASSERT().
@param[in] SecurityHandler Security measurement service handler to be registered.
@param[in] AuthenticationOperation Operation type is specified for the registered handler.
@retval EFI_SUCCESS The handlers were registered successfully.
**/
)
{
//
// Make sure AuthenticationOperation is valid in the register order.
//
//
// Check whether the handler lists is enough to store new handler.
//
//
// Allocate more resources for new handler.
//
}
//
// Register new handler into the handler list.
//
return EFI_SUCCESS;
}
/**
Execute registered handlers until one returns an error and that error is returned.
If none of the handlers return an error, then EFI_SUCCESS is returned.
Before exectue handler, get the image buffer by file device path if a handler
requires the image file. And return the image buffer to each handler when exectue handler.
The handlers are executed in same order to their registered order.
@param[in] AuthenticationStatus
This is the authentication type returned from the Section
Extraction protocol. See the Section Extraction Protocol
Specification for details on this type.
@param[in] FilePath This is a pointer to the device path of the file that is
being dispatched. This will optionally be used for logging.
@retval EFI_SUCCESS The file specified by File did authenticate when more
than one security handler services were registered,
or the file did not authenticate when no security
handler service was registered. And the platform policy
dictates that the DXE Core may use File.
@retval EFI_INVALID_PARAMETER File is NULL.
@retval EFI_SECURITY_VIOLATION The file specified by File did not authenticate, and
the platform policy dictates that File should be placed
in the untrusted state. A file may be promoted from
the untrusted to the trusted state at a future time
with a call to the Trust() DXE Service.
@retval EFI_ACCESS_DENIED The file specified by File did not authenticate, and
the platform policy dictates that File should not be
used for any purpose.
**/
)
{
return EFI_INVALID_PARAMETER;
}
//
// Directly return successfully when no handler is registered.
//
if (mNumberOfSecurityHandler == 0) {
return EFI_SUCCESS;
}
FileBuffer = NULL;
FileSize = 0;
//
// Run security handler in same order to their registered list
//
if ((mSecurityTable[Index].SecurityOperation & EFI_AUTH_OPERATION_IMAGE_REQUIRED) == EFI_AUTH_OPERATION_IMAGE_REQUIRED) {
//
// Try get file buffer when the handler requires image buffer.
//
if (FileBuffer == NULL) {
//
// Try to get image by FALSE boot policy for the exact boot file path.
//
if (FileBuffer == NULL) {
//
// Try to get image by TRUE boot policy for the inexact boot file path.
//
}
}
}
);
break;
}
}
if (FileBuffer != NULL) {
}
return Status;
}