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/** @file
Implement TPM2 Session related command.
Copyright (c) 2014 - 2018, Intel Corporation. All rights reserved. <BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <IndustryStandard/UefiTcgPlatform.h>
#include <Library/Tpm2CommandLib.h>
#include <Library/Tpm2DeviceLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#pragma pack(1)
typedef struct {
TPM2_COMMAND_HEADER Header;
TPMI_DH_OBJECT TpmKey;
TPMI_DH_ENTITY Bind;
TPM2B_NONCE NonceCaller;
TPM2B_ENCRYPTED_SECRET Salt;
TPM_SE SessionType;
TPMT_SYM_DEF Symmetric;
TPMI_ALG_HASH AuthHash;
} TPM2_START_AUTH_SESSION_COMMAND;
typedef struct {
TPM2_RESPONSE_HEADER Header;
TPMI_SH_AUTH_SESSION SessionHandle;
TPM2B_NONCE NonceTPM;
} TPM2_START_AUTH_SESSION_RESPONSE;
#pragma pack()
/**
This command is used to start an authorization session using alternative methods of
establishing the session key (sessionKey) that is used for authorization and encrypting value.
@param[in] TpmKey Handle of a loaded decrypt key used to encrypt salt.
@param[in] Bind Entity providing the authValue.
@param[in] NonceCaller Initial nonceCaller, sets nonce size for the session.
@param[in] Salt Value encrypted according to the type of tpmKey.
@param[in] SessionType Indicates the type of the session.
@param[in] Symmetric The algorithm and key size for parameter encryption.
@param[in] AuthHash Hash algorithm to use for the session.
@param[out] SessionHandle Handle for the newly created session.
@param[out] NonceTPM The initial nonce from the TPM, used in the computation of the sessionKey.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_DEVICE_ERROR The command was unsuccessful.
**/
EFI_STATUS
EFIAPI
Tpm2StartAuthSession (
IN TPMI_DH_OBJECT TpmKey,
IN TPMI_DH_ENTITY Bind,
IN TPM2B_NONCE *NonceCaller,
IN TPM2B_ENCRYPTED_SECRET *Salt,
IN TPM_SE SessionType,
IN TPMT_SYM_DEF *Symmetric,
IN TPMI_ALG_HASH AuthHash,
OUT TPMI_SH_AUTH_SESSION *SessionHandle,
OUT TPM2B_NONCE *NonceTPM
)
{
EFI_STATUS Status;
TPM2_START_AUTH_SESSION_COMMAND SendBuffer;
TPM2_START_AUTH_SESSION_RESPONSE RecvBuffer;
UINT32 SendBufferSize;
UINT32 RecvBufferSize;
UINT8 *Buffer;
//
// Construct command
//
SendBuffer.Header.tag = SwapBytes16(TPM_ST_NO_SESSIONS);
SendBuffer.Header.commandCode = SwapBytes32(TPM_CC_StartAuthSession);
SendBuffer.TpmKey = SwapBytes32 (TpmKey);
SendBuffer.Bind = SwapBytes32 (Bind);
Buffer = (UINT8 *)&SendBuffer.NonceCaller;
WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (NonceCaller->size));
Buffer += sizeof(UINT16);
CopyMem (Buffer, NonceCaller->buffer, NonceCaller->size);
Buffer += NonceCaller->size;
WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Salt->size));
Buffer += sizeof(UINT16);
CopyMem (Buffer, Salt->secret, Salt->size);
Buffer += Salt->size;
*(TPM_SE *)Buffer = SessionType;
Buffer++;
WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->algorithm));
Buffer += sizeof(UINT16);
switch (Symmetric->algorithm) {
case TPM_ALG_NULL:
break;
case TPM_ALG_AES:
WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->keyBits.aes));
Buffer += sizeof(UINT16);
WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->mode.aes));
Buffer += sizeof(UINT16);
break;
case TPM_ALG_SM4:
WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->keyBits.SM4));
Buffer += sizeof(UINT16);
WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->mode.SM4));
Buffer += sizeof(UINT16);
break;
case TPM_ALG_SYMCIPHER:
WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->keyBits.sym));
Buffer += sizeof(UINT16);
WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->mode.sym));
Buffer += sizeof(UINT16);
break;
case TPM_ALG_XOR:
WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->keyBits.xor));
Buffer += sizeof(UINT16);
break;
default:
ASSERT (FALSE);
DEBUG ((DEBUG_ERROR, "Tpm2StartAuthSession - Symmetric->algorithm - %x\n", Symmetric->algorithm));
return EFI_UNSUPPORTED;
}
WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (AuthHash));
Buffer += sizeof(UINT16);
SendBufferSize = (UINT32) ((UINTN)Buffer - (UINTN)&SendBuffer);
SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);
//
// send Tpm command
//
RecvBufferSize = sizeof (RecvBuffer);
Status = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
if (EFI_ERROR (Status)) {
return Status;
}
if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
DEBUG ((DEBUG_ERROR, "Tpm2StartAuthSession - RecvBufferSize Error - %x\n", RecvBufferSize));
return EFI_DEVICE_ERROR;
}
if (SwapBytes32(RecvBuffer.Header.responseCode) != TPM_RC_SUCCESS) {
DEBUG ((DEBUG_ERROR, "Tpm2StartAuthSession - responseCode - %x\n", SwapBytes32(RecvBuffer.Header.responseCode)));
return EFI_DEVICE_ERROR;
}
//
// Return the response
//
*SessionHandle = SwapBytes32 (RecvBuffer.SessionHandle);
NonceTPM->size = SwapBytes16 (RecvBuffer.NonceTPM.size);
if (NonceTPM->size > sizeof(TPMU_HA)) {
DEBUG ((DEBUG_ERROR, "Tpm2StartAuthSession - NonceTPM->size error %x\n", NonceTPM->size));
return EFI_DEVICE_ERROR;
}
CopyMem (NonceTPM->buffer, &RecvBuffer.NonceTPM.buffer, NonceTPM->size);
return EFI_SUCCESS;
}
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