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/********************************************************************************/
/* */
/* TPM Size Checks */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: TpmSizeChecks.c 1628 2020-05-27 19:35:29Z 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 - 2020 */
/* */
/********************************************************************************/
//** Includes, Defines, and Types
#include "Tpm.h"
#include "PlatformACT_fp.h" /* kgold */
#include "TpmSizeChecks_fp.h"
#include <stdio.h>
#include <assert.h>
#if RUNTIME_SIZE_CHECKS
#if TABLE_DRIVEN_MARSHAL
extern uint32_t MarshalDataSize;
#endif
static int once = 0;
//** TpmSizeChecks()
// This function is used during the development process to make sure that the
// vendor-specific values result in a consistent implementation. When possible,
// the code contains #if to do compile-time checks. However, in some cases, the
// values require the use of "sizeof()" and that can't be used in an #if.
BOOL
TpmSizeChecks(
void
)
{
BOOL PASS = TRUE;
#if DEBUG
//
if(once++ != 0)
return 1;
{
UINT32 maxAsymSecurityStrength = MAX_ASYM_SECURITY_STRENGTH;
UINT32 maxHashSecurityStrength = MAX_HASH_SECURITY_STRENGTH;
UINT32 maxSymSecurityStrength = MAX_SYM_SECURITY_STRENGTH;
UINT32 maxSecurityStrengthBits = MAX_SECURITY_STRENGTH_BITS;
UINT32 proofSize = PROOF_SIZE;
UINT32 compliantProofSize = COMPLIANT_PROOF_SIZE;
UINT32 compliantPrimarySeedSize = COMPLIANT_PRIMARY_SEED_SIZE;
UINT32 primarySeedSize = PRIMARY_SEED_SIZE;
UINT32 cmacState = sizeof(tpmCmacState_t);
UINT32 hashState = sizeof(HASH_STATE);
UINT32 keyScheduleSize = sizeof(tpmCryptKeySchedule_t);
//
NOT_REFERENCED(cmacState);
NOT_REFERENCED(hashState);
NOT_REFERENCED(keyScheduleSize);
NOT_REFERENCED(maxAsymSecurityStrength);
NOT_REFERENCED(maxHashSecurityStrength);
NOT_REFERENCED(maxSymSecurityStrength);
NOT_REFERENCED(maxSecurityStrengthBits);
NOT_REFERENCED(proofSize);
NOT_REFERENCED(compliantProofSize);
NOT_REFERENCED(compliantPrimarySeedSize);
NOT_REFERENCED(primarySeedSize);
{
TPMT_SENSITIVE *p;
// This assignment keeps compiler from complaining about a conditional
// comparison being between two constants
UINT16 max_rsa_key_bytes = MAX_RSA_KEY_BYTES;
if((max_rsa_key_bytes / 2) != (sizeof(p->sensitive.rsa.t.buffer) / 5))
{
printf("Sensitive part of TPMT_SENSITIVE is undersized. May be caused"
" by use of wrong version of Part 2.\n");
PASS = FALSE;
}
}
#if TABLE_DRIVEN_MARSHAL
printf("sizeof(MarshalData) = %zu\n", sizeof(MarshalData_st));
#endif
printf("Size of OBJECT = %zu\n", sizeof(OBJECT));
printf("Size of components in TPMT_SENSITIVE = %zu\n", sizeof(TPMT_SENSITIVE));
printf(" TPMI_ALG_PUBLIC %zu\n", sizeof(TPMI_ALG_PUBLIC));
printf(" TPM2B_AUTH %zu\n", sizeof(TPM2B_AUTH));
printf(" TPM2B_DIGEST %zu\n", sizeof(TPM2B_DIGEST));
printf(" TPMU_SENSITIVE_COMPOSITE %zu\n",
sizeof(TPMU_SENSITIVE_COMPOSITE));
}
// Make sure that the size of the context blob is large enough for the largest
// context
// TPMS_CONTEXT_DATA contains two TPM2B values. That is not how this is
// implemented. Rather, the size field of the TPM2B_CONTEXT_DATA is used to
// determine the amount of data in the encrypted data. That part is not
// independently sized. This makes the actual size 2 bytes smaller than
// calculated using Part 2. Since this is opaque to the caller, it is not
// necessary to fix. The actual size is returned by TPM2_GetCapabilties().
// Initialize output handle. At the end of command action, the output
// handle of an object will be replaced, while the output handle
// for a session will be the same as input
// Get the size of fingerprint in context blob. The sequence value in
// TPMS_CONTEXT structure is used as the fingerprint
{
UINT32 fingerprintSize = sizeof(UINT64);
UINT32 integritySize = sizeof(UINT16)
+ CryptHashGetDigestSize(CONTEXT_INTEGRITY_HASH_ALG);
UINT32 biggestObject = MAX(MAX(sizeof(HASH_OBJECT), sizeof(OBJECT)),
sizeof(SESSION));
UINT32 biggestContext = fingerprintSize + integritySize + biggestObject;
// round required size up to nearest 8 byte boundary.
biggestContext = 8 * ((biggestContext + 7) / 8);
if(MAX_CONTEXT_SIZE < biggestContext)
{
printf("MAX_CONTEXT_SIZE needs to be increased to at least to %d (%d)\n",
biggestContext, MAX_CONTEXT_SIZE);
PASS = FALSE;
}
else if (MAX_CONTEXT_SIZE > biggestContext)
{
printf("MAX_CONTEXT_SIZE can be reduced to %d (%d)\n",
biggestContext, MAX_CONTEXT_SIZE);
}
}
{
union u
{
TPMA_OBJECT attributes;
UINT32 uint32Value;
} u;
// these are defined so that compiler doesn't complain about conditional
// expressions comparing two constants.
int aSize = sizeof(u.attributes);
int uSize = sizeof(u.uint32Value);
u.uint32Value = 0;
SET_ATTRIBUTE(u.attributes, TPMA_OBJECT, fixedTPM);
if(u.uint32Value != 2)
{
printf("The bit allocation in a TPMA_OBJECT is not as expected");
PASS = FALSE;
}
if(aSize != uSize) // comparison of two sizeof() values annoys compiler
{
printf("A TPMA_OBJECT is not the expected size.");
PASS = FALSE;
}
}
// Check that the platform implements each of the ACT that the TPM thinks are present
{
uint32_t act;
for(act = 0; act < 16; act++)
{
switch(act)
{
FOR_EACH_ACT(CASE_ACT_NUMBER)
if(!_plat__ACT_GetImplemented(act))
{
printf("TPM_RH_ACT_%1X is not implemented by platform\n",
act);
PASS = FALSE;
}
default:
break;
}
}
}
#endif // DEBUG
return (PASS);
}
#endif // RUNTIME_SIZE_CHECKS
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