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/********************************************************************************/
/* */
/* */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: PP.c 1490 2019-07-26 21:13:22Z kgoldman $ */
/* */
/* Licenses and Notices */
/* */
/* 1. Copyright Licenses: */
/* */
/* - Trusted Computing Group (TCG) grants to the user of the source code in */
/* this specification (the "Source Code") a worldwide, irrevocable, */
/* nonexclusive, royalty free, copyright license to reproduce, create */
/* derivative works, distribute, display and perform the Source Code and */
/* derivative works thereof, and to grant others the rights granted herein. */
/* */
/* - The TCG grants to the user of the other parts of the specification */
/* (other than the Source Code) the rights to reproduce, distribute, */
/* display, and perform the specification solely for the purpose of */
/* developing products based on such documents. */
/* */
/* 2. Source Code Distribution Conditions: */
/* */
/* - Redistributions of Source Code must retain the above copyright licenses, */
/* this list of conditions and the following disclaimers. */
/* */
/* - Redistributions in binary form must reproduce the above copyright */
/* licenses, this list of conditions and the following disclaimers in the */
/* documentation and/or other materials provided with the distribution. */
/* */
/* 3. Disclaimers: */
/* */
/* - THE COPYRIGHT LICENSES SET FORTH ABOVE DO NOT REPRESENT ANY FORM OF */
/* LICENSE OR WAIVER, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, WITH */
/* RESPECT TO PATENT RIGHTS HELD BY TCG MEMBERS (OR OTHER THIRD PARTIES) */
/* THAT MAY BE NECESSARY TO IMPLEMENT THIS SPECIFICATION OR OTHERWISE. */
/* Contact TCG Administration (admin@trustedcomputinggroup.org) for */
/* information on specification licensing rights available through TCG */
/* membership agreements. */
/* */
/* - THIS SPECIFICATION IS PROVIDED "AS IS" WITH NO EXPRESS OR IMPLIED */
/* WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR */
/* FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, COMPLETENESS, OR */
/* NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS, OR ANY WARRANTY */
/* OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. */
/* */
/* - Without limitation, TCG and its members and licensors disclaim all */
/* liability, including liability for infringement of any proprietary */
/* rights, relating to use of information in this specification and to the */
/* implementation of this specification, and TCG disclaims all liability for */
/* cost of procurement of substitute goods or services, lost profits, loss */
/* of use, loss of data or any incidental, consequential, direct, indirect, */
/* or special damages, whether under contract, tort, warranty or otherwise, */
/* arising in any way out of use or reliance upon this specification or any */
/* information herein. */
/* */
/* (c) Copyright IBM Corp. and others, 2016 */
/* */
/********************************************************************************/
/* 8.8 PP.c */
/* 8.8.1 Introduction */
/* This file contains the functions that support the physical presence operations of the TPM. */
/* 8.8.2 Includes */
#include "Tpm.h"
/* 8.8.3 Functions */
/* 8.8.3.1 PhysicalPresencePreInstall_Init() */
/* This function is used to initialize the array of commands that always require confirmation with
physical presence. The array is an array of bits that has a correspondence with the command
code. */
/* This command should only ever be executable in a manufacturing setting or in a simulation. */
/* When set, these cannot be cleared. */
void
PhysicalPresencePreInstall_Init(
void
)
{
COMMAND_INDEX commandIndex;
// Clear all the PP commands
MemorySet(&gp.ppList, 0, sizeof(gp.ppList));
// Any command that is PP_REQUIRED should be SET
for(commandIndex = 0; commandIndex < COMMAND_COUNT; commandIndex++)
{
if(s_commandAttributes[commandIndex] & IS_IMPLEMENTED
&& s_commandAttributes[commandIndex] & PP_REQUIRED)
SET_BIT(commandIndex, gp.ppList);
}
// Write PP list to NV
NV_SYNC_PERSISTENT(ppList);
return;
}
/* 8.8.3.2 PhysicalPresenceCommandSet() */
/* This function is used to set the indicator that a command requires PP confirmation. */
void
PhysicalPresenceCommandSet(
TPM_CC commandCode // IN: command code
)
{
COMMAND_INDEX commandIndex = CommandCodeToCommandIndex(commandCode);
// if the command isn't implemented, the do nothing
if(commandIndex == UNIMPLEMENTED_COMMAND_INDEX)
return;
// only set the bit if this is a command for which PP is allowed
if(s_commandAttributes[commandIndex] & PP_COMMAND)
SET_BIT(commandIndex, gp.ppList);
return;
}
/* 8.8.3.3 PhysicalPresenceCommandClear() */
/* This function is used to clear the indicator that a command requires PP confirmation. */
void
PhysicalPresenceCommandClear(
TPM_CC commandCode // IN: command code
)
{
COMMAND_INDEX commandIndex = CommandCodeToCommandIndex(commandCode);
// If the command isn't implemented, then don't do anything
if(commandIndex == UNIMPLEMENTED_COMMAND_INDEX)
return;
// Only clear the bit if the command does not require PP
if((s_commandAttributes[commandIndex] & PP_REQUIRED) == 0)
CLEAR_BIT(commandIndex, gp.ppList);
return;
}
/* 8.8.3.4 PhysicalPresenceIsRequired() */
/* This function indicates if PP confirmation is required for a command. */
/* Return Values Meaning */
/* TRUE if physical presence is required */
/* FALSE if physical presence is not required */
BOOL
PhysicalPresenceIsRequired(
COMMAND_INDEX commandIndex // IN: command index
)
{
// Check the bit map. If the bit is SET, PP authorization is required
return (TEST_BIT(commandIndex, gp.ppList));
}
/* 8.8.3.5 PhysicalPresenceCapGetCCList() */
/* This function returns a list of commands that require PP confirmation. The list starts from the
first implemented command that has a command code that the same or greater than commandCode. */
/* Return Values Meaning */
/* YES if there are more command codes available */
/* NO all the available command codes have been returned */
TPMI_YES_NO
PhysicalPresenceCapGetCCList(
TPM_CC commandCode, // IN: start command code
UINT32 count, // IN: count of returned TPM_CC
TPML_CC *commandList // OUT: list of TPM_CC
)
{
TPMI_YES_NO more = NO;
COMMAND_INDEX commandIndex;
// Initialize output handle list
commandList->count = 0;
// The maximum count of command we may return is MAX_CAP_CC
if(count > MAX_CAP_CC) count = MAX_CAP_CC;
// Collect PP commands
for(commandIndex = GetClosestCommandIndex(commandCode);
commandIndex != UNIMPLEMENTED_COMMAND_INDEX;
commandIndex = GetNextCommandIndex(commandIndex))
{
if(PhysicalPresenceIsRequired(commandIndex))
{
if(commandList->count < count)
{
// If we have not filled up the return list, add this command
// code to it
commandList->commandCodes[commandList->count]
= GetCommandCode(commandIndex);
commandList->count++;
}
else
{
// If the return list is full but we still have PP command
// available, report this and stop iterating
more = YES;
break;
}
}
}
return more;
}
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