/********************************************************************************/
/*										*/
/*			     				*/
/*			     Written by Ken Goldman				*/
/*		       IBM Thomas J. Watson Research Center			*/
/*            $Id: TpmFail.c 1047 2017-07-20 18:27:34Z 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, 2017				*/
/*										*/
/********************************************************************************/

/* 9.17 TpmFail.c */
/* 9.17.1 Includes, Defines, and Types */
#define     TPM_FAIL_C
#include    "Tpm.h"
#include    <assert.h>
/*     On MS C compiler, can save the alignment state and set the alignment to 1 for the duration of
       the TpmTypes.h include.  This will avoid a lot of alignment warnings from the compiler for
       the unaligned structures. The alignment of the structures is not important as this function
       does not use any of the structures in TpmTypes.h and only include it for the #defines of the
       capabilities, properties, and command code values. */
#include "TpmTypes.h"

#define TPM_HAVE_TPM2_DECLARATIONS
#include "tpm_library_intern.h"

/*     9.17.2 Typedefs */
/* These defines are used primarily for sizing of the local response buffer. */
typedef struct
{
    TPM_ST          tag;
    UINT32          size;
    TPM_RC          code;
} HEADER;
typedef struct
{
    BYTE            tag[sizeof(TPM_ST)];
    BYTE            size[sizeof(UINT32)];
    BYTE            code[sizeof(TPM_RC)];
} PACKED_HEADER;
typedef struct
{
    BYTE             size[sizeof(UINT16)];
    struct
    {
	BYTE         function[sizeof(UINT32)];
	BYTE         line[sizeof(UINT32)];
	BYTE         code[sizeof(UINT32)];
    } values;
    BYTE             returnCode[sizeof(TPM_RC)];
} GET_TEST_RESULT_PARAMETERS;
typedef struct
{
    BYTE         moreData[sizeof(TPMI_YES_NO)];
    BYTE         capability[sizeof(TPM_CAP)]; // Always TPM_CAP_TPM_PROPERTIES
    BYTE         tpmProperty[sizeof(TPML_TAGGED_TPM_PROPERTY)];
} GET_CAPABILITY_PARAMETERS;
typedef struct
{
    BYTE         header[sizeof(PACKED_HEADER)];
    BYTE         getTestResult[sizeof(GET_TEST_RESULT_PARAMETERS)];
} TEST_RESPONSE;
typedef struct
{
    BYTE         header[sizeof(PACKED_HEADER)];
    BYTE         getCap[sizeof(GET_CAPABILITY_PARAMETERS)];
} CAPABILITY_RESPONSE;
typedef union
{
    BYTE         test[sizeof(TEST_RESPONSE)];
    BYTE         cap[sizeof(CAPABILITY_RESPONSE)];
} RESPONSES;
/* Buffer to hold the responses. This may be a little larger than required due to padding that a
   compiler might add. */
/* NOTE: This is not in Global.c because of the specialized data definitions above. Since the data
   contained in this structure is not relevant outside of the execution of a single command (when
   the TPM is in failure mode. There is no compelling reason to move all the typedefs to Global.h
   and this structure to Global.c. */
#ifndef __IGNORE_STATE__ // Don't define this value
static BYTE response[sizeof(RESPONSES)];
#endif
/* 9.17.3 Local Functions */
/* 9.17.3.1 MarshalUint16() */
/* Function to marshal a 16 bit value to the output buffer. */
static INT32
MarshalUint16(
	      UINT16          integer,
	      BYTE            **buffer
	      )
{
    return UINT16_Marshal(&integer, buffer, NULL);
}
/* 9.17.3.2 MarshalUint32() */
/* Function to marshal a 32 bit value to the output buffer. */
static INT32
MarshalUint32(
	      UINT32           integer,
	      BYTE            **buffer
	      )
{
    return UINT32_Marshal(&integer, buffer, NULL);
}
/* 9.17.3.3 UnmarshalHeader() */
/* function to unmarshal the 10-byte command header. */
static BOOL
UnmarshalHeader(
		HEADER          *header,
		BYTE            **buffer,
		INT32           *size
		)
{
    UINT32 usize;
    TPM_RC ucode;
    if(UINT16_Unmarshal(&header->tag, buffer, size) != TPM_RC_SUCCESS
       || UINT32_Unmarshal(&usize, buffer, size) != TPM_RC_SUCCESS
       || UINT32_Unmarshal(&ucode, buffer, size) != TPM_RC_SUCCESS)
	return FALSE;
    header->size = usize;
    header->code = ucode;
    return TRUE;
}
/* 9.17.4 Public Functions */
#ifdef SIMULATION
/* 9.17.4.1 SetForceFailureMode() */
/* This function is called by the simulator to enable failure mode testing. */
LIB_EXPORT void
SetForceFailureMode(
		    void
		    )
{
    g_forceFailureMode = TRUE;
    return;
}
#endif
/* 9.17.4.2 TpmFail() */
/* This function is called by TPM.lib when a failure occurs. It will set up the failure values to be
   returned on TPM2_GetTestResult(). */
NORETURN void
TpmFail(
#ifndef NO_FAIL_TRACE
	const char      *function,
	int              line,
#endif
	int              code
	)
{
#if 0
#ifndef NO_FAIL_TRACE
    UINT32     *failFuncp;
    // Save the values that indicate where the error occurred.
    // On a 64-bit machine, this may truncate the address of the string
    // of the function name where the error occurred.
    failFuncp = (UINT32 *)&function;
    s_failFunction = *failFuncp;
    s_failLine = line;
#else
    s_failFunction = (UINT32)0;
    s_failLine = 0;
#endif
    s_failCode = code;
    // We are in failure mode
    g_inFailureMode = TRUE;
    // if asserts are enabled, then do an assert unless the failure mode code
    // is being tested.
#ifdef SIMULATION
#   ifndef NDEBUG
    assert(g_forceFailureMode);
#   endif
    // Clear this flag
    g_forceFailureMode = FALSE;
#endif

#else

    TpmSetFailureMode(
#ifndef NO_FAIL_TRACE
                      function, line,
#endif
                      code);

#endif
    // Jump to the failure mode code.
    // Note: only get here if asserts are off or if we are testing failure mode
    _plat__Fail();
}

void
TpmSetFailureMode(
#ifndef NO_FAIL_TRACE
	const char      *function,
	int              line,
#endif
	int              code
	)
{
    // Save the values that indicate where the error occurred.
    // On a 64-bit machine, this may truncate the address of the string
    // of the function name where the error occurred.
#ifndef NO_FAIL_TRACE
    s_failFunction = *(UINT32 *)function;
    s_failLine = line;
#else
    s_failFunction = (UINT32)0;
    s_failLine = 0;
#endif
    s_failCode = code;

    TPMLIB_LogTPM2Error("Entering failure mode; code: %d"
#ifndef NO_FAIL_TRACE
    ", location: %s line %d"
#endif
    "\n", s_failCode
#ifndef NO_FAIL_TRACE
    , function, s_failLine
#endif
    );

    // We are in failure mode
    g_inFailureMode = TRUE;
}
/* 9.17.5 TpmFailureMode */
/* This function is called by the interface code when the platform is in failure mode. */
void
TpmFailureMode(
	       unsigned int     inRequestSize,     // IN: command buffer size
	       unsigned char   *inRequest,         // IN: command buffer
	       unsigned int    *outResponseSize,   // OUT: response buffer size
	       unsigned char   **outResponse       // OUT: response buffer
	       )
{
    BYTE            *buffer;
    UINT32           marshalSize;
    UINT32           capability;
    HEADER           header;    // unmarshaled command header
    UINT32           pt;    // unmarshaled property type
    UINT32           count; // unmarshaled property count
    // If there is no command buffer, then just return TPM_RC_FAILURE
    if(inRequestSize == 0 || inRequest == NULL)
	goto FailureModeReturn;
    // If the header is not correct for TPM2_GetCapability() or
    // TPM2_GetTestResult() then just return the in failure mode response;
    buffer = inRequest;
    if(!UnmarshalHeader(&header, &inRequest, (INT32 *)&inRequestSize))
	goto FailureModeReturn;
    if(header.tag != TPM_ST_NO_SESSIONS
       || header.size < 10)
	goto FailureModeReturn;
    switch(header.code)
	{
	  case TPM_CC_GetTestResult:
	    // make sure that the command size is correct
	    if(header.size != 10)
		goto FailureModeReturn;
	    buffer = &response[10];
	    marshalSize = MarshalUint16(3 * sizeof(UINT32), &buffer);
	    marshalSize += MarshalUint32(s_failFunction, &buffer);
	    marshalSize += MarshalUint32(s_failLine, &buffer);
	    marshalSize += MarshalUint32(s_failCode, &buffer);
	    if(s_failCode == FATAL_ERROR_NV_UNRECOVERABLE)
		marshalSize += MarshalUint32(TPM_RC_NV_UNINITIALIZED, &buffer);
	    else
		marshalSize += MarshalUint32(TPM_RC_FAILURE, &buffer);
	    break;
	  case TPM_CC_GetCapability:
	    // make sure that the size of the command is exactly the size
	    // returned for the capability, property, and count
	    if(header.size != (10 + (3 * sizeof(UINT32)))
	       // also verify that this is requesting TPM properties
	       || TPM_RC_SUCCESS != UINT32_Unmarshal(&capability, &inRequest,
						     (INT32 *)&inRequestSize)
	       || capability != TPM_CAP_TPM_PROPERTIES
	       || TPM_RC_SUCCESS != UINT32_Unmarshal(&pt, &inRequest,
						     (INT32 *)&inRequestSize)
	       || TPM_RC_SUCCESS != UINT32_Unmarshal(&count, &inRequest,
						     (INT32 *)&inRequestSize))
		goto FailureModeReturn;
	    // If in failure mode because of an unrecoverable read error, and the
	    // property is 0 and the count is 0, then this is an indication to
	    // re-manufacture the TPM. Do the re-manufacture but stay in failure
	    // mode until the TPM is reset.
	    // Note: this behavior is not required by the specification and it is
	    // OK to leave the TPM permanently bricked due to an unrecoverable NV
	    // error.
	    if(count == 0 && pt == 0 && s_failCode == FATAL_ERROR_NV_UNRECOVERABLE)
		{
		    g_manufactured = FALSE;
		    TPM_Manufacture(0);
		}
	    if(count > 0)
		count = 1;
	    else if(pt > TPM_PT_FIRMWARE_VERSION_2)
		count = 0;
	    if(pt < TPM_PT_MANUFACTURER)
		pt = TPM_PT_MANUFACTURER;
	    // set up for return
	    buffer = &response[10];
	    // if the request was for a PT less than the last one
	    // then we indicate more, otherwise, not.
	    if(pt < TPM_PT_FIRMWARE_VERSION_2)
		*buffer++ = YES;
	    else
		*buffer++ = NO;
	    marshalSize = 1;
	    // indicate the capability type
	    marshalSize += MarshalUint32(capability, &buffer);
	    // indicate the number of values that are being returned (0 or 1)
	    marshalSize += MarshalUint32(count, &buffer);
	    // indicate the property
	    marshalSize += MarshalUint32(pt, &buffer);
	    if(count > 0)
		switch(pt)
		    {
		      case TPM_PT_MANUFACTURER:
			// the vendor ID unique to each TPM manufacturer
#ifdef  MANUFACTURER
			pt = *(UINT32*)MANUFACTURER;
#else
			pt = 0;
#endif
			break;
		      case TPM_PT_VENDOR_STRING_1:
			// the first four characters of the vendor ID string
#ifdef  VENDOR_STRING_1
			pt = *(UINT32*)VENDOR_STRING_1;
#else
			pt = 0;
#endif
			break;
		      case TPM_PT_VENDOR_STRING_2:
			// the second four characters of the vendor ID string
#ifdef  VENDOR_STRING_2
			pt = *(UINT32*)VENDOR_STRING_2;
#else
			pt = 0;
#endif
			break;
		      case TPM_PT_VENDOR_STRING_3:
			// the third four characters of the vendor ID string
#ifdef  VENDOR_STRING_3
			pt = *(UINT32*)VENDOR_STRING_3;
#else
			pt = 0;
#endif
			break;
		      case TPM_PT_VENDOR_STRING_4:
			// the fourth four characters of the vendor ID string
#ifdef  VENDOR_STRING_4
			pt = *(UINT32*)VENDOR_STRING_4;
#else
			pt = 0;
#endif
			break;
		      case TPM_PT_VENDOR_TPM_TYPE:
			// vendor-defined value indicating the TPM model
			// We just make up a number here
			pt = 1;
			break;
		      case TPM_PT_FIRMWARE_VERSION_1:
			// the more significant 32-bits of a vendor-specific value
			// indicating the version of the firmware
#ifdef  FIRMWARE_V1
			pt = FIRMWARE_V1;
#else
			pt = 0;
#endif
			break;
		      default: // TPM_PT_FIRMWARE_VERSION_2:
			// the less significant 32-bits of a vendor-specific value
			// indicating the version of the firmware
#ifdef  FIRMWARE_V2
			pt = FIRMWARE_V2;
#else
			pt = 0;
#endif
			break;
		    }
	    marshalSize += MarshalUint32(pt, &buffer);
	    break;
	  default: // default for switch (cc)
	    goto FailureModeReturn;
	}
    // Now do the header
    buffer = response;
    marshalSize = marshalSize + 10; // Add the header size to the
    // stuff already marshaled
    MarshalUint16(TPM_ST_NO_SESSIONS, &buffer); // structure tag
    MarshalUint32(marshalSize, &buffer);  // responseSize
    MarshalUint32(TPM_RC_SUCCESS, &buffer); // response code
    *outResponseSize = marshalSize;
    *outResponse = (unsigned char *)&response;
    return;
 FailureModeReturn:
    buffer = response;
    marshalSize = MarshalUint16(TPM_ST_NO_SESSIONS, &buffer);
    marshalSize += MarshalUint32(10, &buffer);
    marshalSize += MarshalUint32(TPM_RC_FAILURE, &buffer);
    *outResponseSize = marshalSize;
    *outResponse = (unsigned char *)response;
    return;
}
/* 9.17.6 UnmarshalFail() */
/* This is a stub that is used to catch an attempt to unmarshal an entry that is not defined. Don't
   ever expect this to be called but... */
void
UnmarshalFail(
	      void            *type,
	      BYTE            **buffer,
	      INT32           *size
	      )
{
    NOT_REFERENCED(type);
    NOT_REFERENCED(buffer);
    NOT_REFERENCED(size);
    FAIL(FATAL_ERROR_INTERNAL);
}
