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/********************************************************************************/
/* */
/* Session Commands */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: SessionCommands.c 1519 2019-11-15 20:43:51Z 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 - 2019 */
/* */
/********************************************************************************/
#include "Tpm.h"
#include "StartAuthSession_fp.h"
#if CC_StartAuthSession // Conditional expansion of this file
TPM_RC
TPM2_StartAuthSession(
StartAuthSession_In *in, // IN: input parameter buffer
StartAuthSession_Out *out // OUT: output parameter buffer
)
{
TPM_RC result = TPM_RC_SUCCESS;
OBJECT *tpmKey; // TPM key for decrypt salt
TPM2B_DATA salt;
// Input Validation
// Check input nonce size. IT should be at least 16 bytes but not larger
// than the digest size of session hash.
if(in->nonceCaller.t.size < 16
|| in->nonceCaller.t.size > CryptHashGetDigestSize(in->authHash))
return TPM_RCS_SIZE + RC_StartAuthSession_nonceCaller;
// If an decrypt key is passed in, check its validation
if(in->tpmKey != TPM_RH_NULL)
{
// Get pointer to loaded decrypt key
tpmKey = HandleToObject(in->tpmKey);
// key must be asymmetric with its sensitive area loaded. Since this
// command does not require authorization, the presence of the sensitive
// area was not already checked as it is with most other commands that
// use the sensitive are so check it here
if(!CryptIsAsymAlgorithm(tpmKey->publicArea.type))
return TPM_RCS_KEY + RC_StartAuthSession_tpmKey;
// secret size cannot be 0
if(in->encryptedSalt.t.size == 0)
return TPM_RCS_VALUE + RC_StartAuthSession_encryptedSalt;
// Decrypting salt requires accessing the private portion of a key.
// Therefore, tmpKey can not be a key with only public portion loaded
if(tpmKey->attributes.publicOnly)
return TPM_RCS_HANDLE + RC_StartAuthSession_tpmKey;
// HMAC session input handle check.
// tpmKey should be a decryption key
if(!IS_ATTRIBUTE(tpmKey->publicArea.objectAttributes, TPMA_OBJECT, decrypt))
return TPM_RCS_ATTRIBUTES + RC_StartAuthSession_tpmKey;
// Secret Decryption. A TPM_RC_VALUE, TPM_RC_KEY or Unmarshal errors
// may be returned at this point
result = CryptSecretDecrypt(tpmKey, &in->nonceCaller, SECRET_KEY,
&in->encryptedSalt, &salt);
if(result != TPM_RC_SUCCESS)
return TPM_RCS_VALUE + RC_StartAuthSession_encryptedSalt;
}
else
{
// secret size must be 0
if(in->encryptedSalt.t.size != 0)
return TPM_RCS_VALUE + RC_StartAuthSession_encryptedSalt;
salt.t.size = 0;
}
switch(HandleGetType(in->bind))
{
case TPM_HT_TRANSIENT:
{
OBJECT *object = HandleToObject(in->bind);
// If the bind handle references a transient object, make sure that we
// can get to the authorization value. Also, make sure that the object
// has a proper Name (nameAlg != TPM_ALG_NULL). If it doesn't, then
// it might be possible to bind to an object where the authValue is
// known. This does not create a real issue in that, if you know the
// authorization value, you can actually bind to the object. However,
// there is a potential
if(object->attributes.publicOnly == SET)
return TPM_RCS_HANDLE + RC_StartAuthSession_bind;
break;
}
case TPM_HT_NV_INDEX:
// a PIN index can't be a bind object
{
NV_INDEX *nvIndex = NvGetIndexInfo(in->bind, NULL);
if(IsNvPinPassIndex(nvIndex->publicArea.attributes)
|| IsNvPinFailIndex(nvIndex->publicArea.attributes))
return TPM_RCS_HANDLE + RC_StartAuthSession_bind;
break;
}
default:
break;
}
// If 'symmetric' is a symmetric block cipher (not TPM_ALG_NULL or TPM_ALG_XOR)
// then the mode must be CFB.
if(in->symmetric.algorithm != TPM_ALG_NULL
&& in->symmetric.algorithm != TPM_ALG_XOR
&& in->symmetric.mode.sym != TPM_ALG_CFB)
return TPM_RCS_MODE + RC_StartAuthSession_symmetric;
// Internal Data Update and command output
// Create internal session structure. TPM_RC_CONTEXT_GAP, TPM_RC_NO_HANDLES
// or TPM_RC_SESSION_MEMORY errors may be returned at this point.
//
// The detailed actions for creating the session context are not shown here
// as the details are implementation dependent
// SessionCreate sets the output handle and nonceTPM
result = SessionCreate(in->sessionType, in->authHash, &in->nonceCaller,
&in->symmetric, in->bind, &salt, &out->sessionHandle,
&out->nonceTPM);
return result;
}
#endif // CC_StartAuthSession
#include "Tpm.h"
#include "PolicyRestart_fp.h"
#if CC_PolicyRestart // Conditional expansion of this file
TPM_RC
TPM2_PolicyRestart(
PolicyRestart_In *in // IN: input parameter list
)
{
// Initialize policy session data
SessionResetPolicyData(SessionGet(in->sessionHandle));
return TPM_RC_SUCCESS;
}
#endif // CC_PolicyRestart
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