githubmirror/libtpms

src/tpm2/CommandCodeAttributes.c
558 строк21 KB
Stefan Berger
tpm2: rev162: Trivial whitespace and comment changes
27 май 2020, 14:45
27 май 2020, 14:4505c0327
/********************************************************************************/
/*										*/
/*		Functions for testing various command properties		*/
/*			     Written by Ken Goldman				*/
/*		       IBM Thomas J. Watson Research Center			*/
/*            $Id: CommandCodeAttributes.c 1594 2020-03-26 22:15:48Z kgoldman $	*/
/*										*/
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/*  (c) Copyright IBM Corp. and others, 2016 - 2020				*/
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/********************************************************************************/

/* 9.3 CommandCodeAttributes.c */
/* 9.3.1 Introduction */
/* This file contains the functions for testing various command properties. */
/* 9.3.2 Includes and Defines */
#include "Tpm.h"
#include "CommandCodeAttributes_fp.h"
/* Set the default value for CC_VEND if not already set */
#ifndef CC_VEND
#define     CC_VEND     (TPM_CC)(0x20000000)
#endif
typedef UINT16          ATTRIBUTE_TYPE;
/* The following file is produced from the command tables in part 3 of the specification. It defines
   the attributes for each of the commands. */
/* NOTE: This file is currently produced by an automated process. Files produced from Part 2 or Part
   3 tables through automated processes are not included in the specification so that there is no
   ambiguity about the table containing the information being the normative definition. */
#define _COMMAND_CODE_ATTRIBUTES_
#include    "CommandAttributeData.h"
/* 9.3.3 Command Attribute Functions */
/* 9.3.3.1 NextImplementedIndex() */
/* This function is used when the lists are not compressed. In a compressed list, only the
   implemented commands are present. So, a search might find a value but that value may not be
   implemented. This function checks to see if the input commandIndex points to an implemented
   command and, if not, it searches upwards until it finds one. When the list is compressed, this
   function gets defined as a no-op. */
/* Return Value	Meaning */
/* UNIMPLEMENTED_COMMAND_INDEX	command is not implemented */
/* other	index of the command */

#if !COMPRESSED_LISTS
static COMMAND_INDEX
NextImplementedIndex(
		     COMMAND_INDEX       commandIndex
		     )
{
    for(;commandIndex < COMMAND_COUNT; commandIndex++)
	{
	    if(s_commandAttributes[commandIndex] & IS_IMPLEMENTED)
		return commandIndex;
	}
    return UNIMPLEMENTED_COMMAND_INDEX;
}
#else
#define NextImplementedIndex(x) (x)
#endif
/* 9.3.3.2 GetClosestCommandIndex() */
/* This function returns the command index for the command with a value that is equal to or greater
   than the input value */
/* Return Value	Meaning */
/* UNIMPLEMENTED_COMMAND_INDEX	command is not implemented */
/* other	index of the command */

COMMAND_INDEX
GetClosestCommandIndex(
		       TPM_CC           commandCode    // IN: the command code to start at
		       )
{
    BOOL                vendor = (commandCode & CC_VEND) != 0;
    COMMAND_INDEX       searchIndex = (COMMAND_INDEX)commandCode;
    // The commandCode is a UINT32 and the search index is UINT16. We are going to
    // search for a match but need to make sure that the commandCode value is not
    // out of range. To do this, need to clear the vendor bit of the commandCode
    // (if set) and compare the result to the 16-bit searchIndex value. If it is
    // out of range, indicate that the command is not implemented
    if((commandCode & ~CC_VEND) != searchIndex)
	return UNIMPLEMENTED_COMMAND_INDEX;
    // if there is at least one vendor command, the last entry in the array will
    // have the v bit set. If the input commandCode is larger than the last
    // vendor-command, then it is out of range.
    if(vendor)
	{
#if VENDOR_COMMAND_ARRAY_SIZE > 0
	    COMMAND_INDEX       commandIndex;
	    COMMAND_INDEX       min;
	    COMMAND_INDEX       max;
	    int                 diff;
#if LIBRARY_COMMAND_ARRAY_SIZE == COMMAND_COUNT
#error "Constants are not consistent."
#endif
	    // Check to see if the value is equal to or below the minimum
	    // entry.
	    // Note: Put this check first so that the typical case of only one vendor-
	    // specific command doesn't waste any more time.
	    if(GET_ATTRIBUTE(s_ccAttr[LIBRARY_COMMAND_ARRAY_SIZE], TPMA_CC,
			     commandIndex) >= searchIndex)
		{
		    // the vendor array is always assumed to be packed so there is
		    // no need to check to see if the command is implemented
		    return LIBRARY_COMMAND_ARRAY_SIZE;
		}
	    // See if this is out of range on the top
	    if(GET_ATTRIBUTE(s_ccAttr[COMMAND_COUNT - 1], TPMA_CC, commandIndex)
	       < searchIndex)
		{
		    return UNIMPLEMENTED_COMMAND_INDEX;
		}
	    commandIndex = UNIMPLEMENTED_COMMAND_INDEX; // Needs initialization to keep
	    // compiler happy
	    min = LIBRARY_COMMAND_ARRAY_SIZE;       // first vendor command
	    max = COMMAND_COUNT - 1;                // last vendor command
	    diff = 1;                               // needs initialization to keep
	    // compiler happy
	    while(min <= max)
		{
		    commandIndex = (min + max + 1) / 2;
		    diff = GET_ATTRIBUTE(s_ccAttr[commandIndex], TPMA_CC, commandIndex)
			   - searchIndex;
		    if(diff == 0)
			return commandIndex;
		    if(diff > 0)
			max = commandIndex - 1;
		    else
			min = commandIndex + 1;
		}
	    // didn't find and exact match. commandIndex will be pointing at the last
	    // item tested. If 'diff' is positive, then the last item tested was
	    // larger index of the command code so it is the smallest value
	    // larger than the requested value.
	    if(diff > 0)
		return commandIndex;
	    // if 'diff' is negative, then the value tested was smaller than
	    // the commandCode index and the next higher value is the correct one.
	    // Note: this will necessarily be in range because of the earlier check
	    // that the index was within range.
	    return commandIndex + 1;
#else
	    // If there are no vendor commands so anything with the vendor bit set is out
	    // of range
	    return UNIMPLEMENTED_COMMAND_INDEX;
#endif
	}
    // Get here if the V-Bit was not set in 'commandCode'
    if(GET_ATTRIBUTE(s_ccAttr[LIBRARY_COMMAND_ARRAY_SIZE - 1], TPMA_CC,
		     commandIndex) < searchIndex)
	{
	    // requested index is out of the range to the top
#if VENDOR_COMMAND_ARRAY_SIZE > 0
	    // If there are vendor commands, then the first vendor command
	    // is the next value greater than the commandCode.
	    // NOTE: we got here if the starting index did not have the V bit but we
	    // reached the end of the array of library commands (non-vendor). Since
	    // there is at least one vendor command, and vendor commands are always
	    // in a compressed list that starts after the library list, the next
	    // index value contains a valid vendor command.
	    return LIBRARY_COMMAND_ARRAY_SIZE;
#else
	    // if there are no vendor commands, then this is out of range
	    return UNIMPLEMENTED_COMMAND_INDEX;
#endif
	}
    // If the request is lower than any value in the array, then return
    // the lowest value (needs to be an index for an implemented command
    if(GET_ATTRIBUTE(s_ccAttr[0], TPMA_CC, commandIndex) >= searchIndex)
	{
	    return NextImplementedIndex(0);
	}
    else
	{
#if COMPRESSED_LISTS
	    COMMAND_INDEX       commandIndex = UNIMPLEMENTED_COMMAND_INDEX;
	    COMMAND_INDEX       min = 0;
	    COMMAND_INDEX       max = LIBRARY_COMMAND_ARRAY_SIZE - 1;
	    int                 diff = 1;
#if LIBRARY_COMMAND_ARRAY_SIZE == 0
#error  "Something is terribly wrong"
#endif
	    // The s_ccAttr array contains an extra entry at the end (a zero value).
	    // Don't count this as an array entry. This means that max should start
	    // out pointing to the last valid entry in the array which is - 2
	    pAssert(max == (sizeof(s_ccAttr) / sizeof(TPMA_CC)
			    - VENDOR_COMMAND_ARRAY_SIZE - 2));
	    while(min <= max)
		{
		    commandIndex = (min + max + 1) / 2;
		    diff = GET_ATTRIBUTE(s_ccAttr[commandIndex], TPMA_CC,
					 commandIndex) - searchIndex;
		    if(diff == 0)
			return commandIndex;
		    if(diff > 0)
			max = commandIndex - 1;
		    else
			min = commandIndex + 1;
		}
	    // didn't find and exact match. commandIndex will be pointing at the
	    // last item tested. If diff is positive, then the last item tested was
	    // larger index of the command code so it is the smallest value
	    // larger than the requested value.
	    if(diff > 0)
		return commandIndex;
	    // if diff is negative, then the value tested was smaller than
	    // the commandCode index and the next higher value is the correct one.
	    // Note: this will necessarily be in range because of the earlier check
	    // that the index was within range.
	    return commandIndex + 1;
#else
	    // The list is not compressed so offset into the array by the command
	    // code value of the first entry in the list. Then go find the first
	    // implemented command.
	    return NextImplementedIndex(searchIndex
					- (COMMAND_INDEX)s_ccAttr[0].commandIndex);
#endif
	}
}
/* 9.3.3.3 CommandCodeToComandIndex() */
/* This function returns the index in the various attributes arrays of the command. */
/* Return Values Meaning */
/* UNIMPLEMENTED_COMMAND_INDEX command is not implemented */
/* other index of the command */
COMMAND_INDEX
CommandCodeToCommandIndex(
			  TPM_CC           commandCode    // IN: the command code to look up
			  )
{
    // Extract the low 16-bits of the command code to get the starting search index
    COMMAND_INDEX       searchIndex = (COMMAND_INDEX)commandCode;
    BOOL                vendor = (commandCode & CC_VEND) != 0;
    COMMAND_INDEX       commandIndex;
#if !COMPRESSED_LISTS
    if(!vendor)
	{
	    commandIndex = searchIndex - (COMMAND_INDEX)s_ccAttr[0].commandIndex;
	    // Check for out of range or unimplemented.
	    // Note, since a COMMAND_INDEX is unsigned, if searchIndex is smaller than
	    // the lowest value of command, it will become a 'negative' number making
	    // it look like a large unsigned number, this will cause it to fail
	    // the unsigned check below.
	    if(commandIndex >= LIBRARY_COMMAND_ARRAY_SIZE
	       || (s_commandAttributes[commandIndex] & IS_IMPLEMENTED) == 0)
		return UNIMPLEMENTED_COMMAND_INDEX;
	    return commandIndex;
	}
#endif
    // Need this code for any vendor code lookup or for compressed lists
    commandIndex = GetClosestCommandIndex(commandCode);
    // Look at the returned value from get closest. If it isn't the one that was
    // requested, then the command is not implemented.
    if(commandIndex != UNIMPLEMENTED_COMMAND_INDEX)
	{
	    if((GET_ATTRIBUTE(s_ccAttr[commandIndex], TPMA_CC, commandIndex)
		!= searchIndex)
	       || (IS_ATTRIBUTE(s_ccAttr[commandIndex], TPMA_CC, V)) != vendor)
		commandIndex = UNIMPLEMENTED_COMMAND_INDEX;
	}
    return commandIndex;
}
/* 9.3.3.4 GetNextCommandIndex() */
/* This function returns the index of the next implemented command. */
/* Return Values Meaning */
/* UNIMPLEMENTED_COMMAND_INDEX no more implemented commands */
/* other the index of the next implemented command */
COMMAND_INDEX
GetNextCommandIndex(
		    COMMAND_INDEX    commandIndex   // IN: the starting index
		    )
{
    while(++commandIndex < COMMAND_COUNT)
	{
#if !COMPRESSED_LISTS
	    if(s_commandAttributes[commandIndex] & IS_IMPLEMENTED)
#endif
		return commandIndex;
	}
    return UNIMPLEMENTED_COMMAND_INDEX;
}
/* 9.3.3.5 GetCommandCode() */
/* This function returns the commandCode associated with the command index */
TPM_CC
GetCommandCode(
	       COMMAND_INDEX    commandIndex   // IN: the command index
	       )
{
    TPM_CC           commandCode = GET_ATTRIBUTE(s_ccAttr[commandIndex],
						 TPMA_CC, commandIndex);
    if(IS_ATTRIBUTE(s_ccAttr[commandIndex], TPMA_CC, V))
	commandCode += CC_VEND;
    return commandCode;
}
/* 9.3.3.6 CommandAuthRole() */
/* This function returns the authorization role required of a handle. */
/* Return Values Meaning */
/* AUTH_NONE no authorization is required */
/* AUTH_USER user role authorization is required */
/* AUTH_ADMIN admin role authorization is required */
/* AUTH_DUP duplication role authorization is required */
AUTH_ROLE
CommandAuthRole(
		COMMAND_INDEX    commandIndex,  // IN: command index
		UINT32           handleIndex    // IN: handle index (zero based)
		)
{
    if(0 == handleIndex)
	{
	    // Any authorization role set?
	    COMMAND_ATTRIBUTES  properties = s_commandAttributes[commandIndex];
	    if(properties & HANDLE_1_USER)
		return AUTH_USER;
	    if(properties & HANDLE_1_ADMIN)
		return AUTH_ADMIN;
	    if(properties & HANDLE_1_DUP)
		return AUTH_DUP;
	}
    else if(1 == handleIndex)
	{
	    if(s_commandAttributes[commandIndex] & HANDLE_2_USER)
		return AUTH_USER;
	}
    return AUTH_NONE;
}
/* 9.3.3.7 EncryptSize() */
/* This function returns the size of the decrypt size field. This function returns 0 if encryption
   is not allowed */
/* Return Values Meaning */
/* 0 encryption not allowed */
/* 2 size field is two bytes */
/* 4 size field is four bytes */

int
EncryptSize(
	    COMMAND_INDEX    commandIndex   // IN: command index
	    )
{
    return ((s_commandAttributes[commandIndex] & ENCRYPT_2) ? 2 :
	    (s_commandAttributes[commandIndex] & ENCRYPT_4) ? 4 : 0);
}

/* 9.3.3.8 DecryptSize() */
/* This function returns the size of the decrypt size field. This function returns 0 if decryption
   is not allowed */
/* Return Values Meaning */
/* 0 encryption not allowed */
/* 2 size field is two bytes */
/* 4 size field is four bytes */

int
DecryptSize(
	    COMMAND_INDEX    commandIndex   // IN: command index
	    )
{
    return ((s_commandAttributes[commandIndex] & DECRYPT_2) ? 2 :
	    (s_commandAttributes[commandIndex] & DECRYPT_4) ? 4 : 0);
}

/* 9.3.3.9 IsSessionAllowed() */
/* This function indicates if the command is allowed to have sessions. */
/* This function must not be called if the command is not known to be implemented. */
/* Return Values Meaning */
/* TRUE session is allowed with this command */
/* FALSE session is not allowed with this command */

BOOL
IsSessionAllowed(
		 COMMAND_INDEX    commandIndex   // IN: the command to be checked
		 )
{
    return ((s_commandAttributes[commandIndex] & NO_SESSIONS) == 0);
}

/* 9.3.3.10 IsHandleInResponse() */
/* This function determines if a command has a handle in the response */

BOOL
IsHandleInResponse(
		   COMMAND_INDEX    commandIndex
		   )
{
    return ((s_commandAttributes[commandIndex] & R_HANDLE) != 0);
}

/* 9.3.3.11 IsWriteOperation() */
/* Checks to see if an operation will write to an NV Index and is subject to being blocked by
   read-lock */
BOOL
IsWriteOperation(
		 COMMAND_INDEX    commandIndex   // IN: Command to check
		 )
{
#ifdef  WRITE_LOCK
    return ((s_commandAttributes[commandIndex] & WRITE_LOCK) != 0);
#else
    if(!IS_ATTRIBUTE(s_ccAttr[commandIndex], TPMA_CC, V))
	{
	    switch(GET_ATTRIBUTE(s_ccAttr[commandIndex], TPMA_CC, commandIndex))
		{
		  case TPM_CC_NV_Write:
#if CC_NV_Increment
		  case TPM_CC_NV_Increment:
#endif
#if CC_NV_SetBits
		  case TPM_CC_NV_SetBits:
#endif
#if CC_NV_Extend
		  case TPM_CC_NV_Extend:
#endif
#if CC_AC_Send
		  case TPM_CC_AC_Send:
#endif
		    // NV write lock counts as a write operation for authorization purposes.
		    // We check to see if the NV is write locked before we do the
		    // authorization. If it is locked, we fail the command early.
		  case TPM_CC_NV_WriteLock:
		    return TRUE;
		  default:
		    break;
		}
	}
    return FALSE;
#endif
}
/* 9.3.3.12 IsReadOperation() */
/* Checks to see if an operation will write to an NV Index and is subject to being blocked by
   write-lock. */
BOOL
IsReadOperation(
		COMMAND_INDEX    commandIndex   // IN: Command to check
		)
{
#ifdef  READ_LOCK
    return ((s_commandAttributes[commandIndex] & READ_LOCK) != 0);
#else
    if(!IS_ATTRIBUTE(s_ccAttr[commandIndex], TPMA_CC, V))
	{
	    switch(GET_ATTRIBUTE(s_ccAttr[commandIndex], TPMA_CC, commandIndex))
		{
		  case TPM_CC_NV_Read:
		  case TPM_CC_PolicyNV:
		  case TPM_CC_NV_Certify:
		    // NV read lock counts as a read operation for authorization purposes.
		    // We check to see if the NV is read locked before we do the
		    // authorization. If it is locked, we fail the command early.
		  case TPM_CC_NV_ReadLock:
		    return TRUE;
		  default:
		    break;
		}
	}
    return FALSE;
#endif
}
/* 9.3.3.13 CommandCapGetCCList() */
/* This function returns a list of implemented commands and command attributes starting from the
   command in commandCode. */
/* Return Values Meaning */
/* YES more command attributes are available */
/* NO no more command attributes are available */
TPMI_YES_NO
CommandCapGetCCList(
		    TPM_CC           commandCode,   // IN: start command code
		    UINT32           count,         // IN: maximum count for number of entries in
		    //     'commandList'
		    TPML_CCA        *commandList    // OUT: list of TPMA_CC
		    )
{
    TPMI_YES_NO      more = NO;
    COMMAND_INDEX    commandIndex;
    // initialize output handle list count
    commandList->count = 0;
    for(commandIndex = GetClosestCommandIndex(commandCode);
	commandIndex != UNIMPLEMENTED_COMMAND_INDEX;
	commandIndex = GetNextCommandIndex(commandIndex))
	{
#if !COMPRESSED_LISTS
	    // this check isn't needed for compressed lists.
	    if(!(s_commandAttributes[commandIndex] & IS_IMPLEMENTED))
		continue;
#endif
	    if(commandList->count < count)
		{
		    // If the list is not full, add the attributes for this command.
		    commandList->commandAttributes[commandList->count]
			= s_ccAttr[commandIndex];
		    commandList->count++;
		}
	    else
		{
		    // If the list is full but there are more commands to report,
		    // indicate this and return.
		    more = YES;
		    break;
		}
	}
    return more;
}
#if 0 /* libtpms added */
/* 9.3.3.14 IsVendorCommand() */
/* Function indicates if a command index references a vendor command. */
/* Return Values Meaning */
/* TRUE command is a vendor command */
/* FALSE command is not a vendor command */

BOOL
IsVendorCommand(
		COMMAND_INDEX    commandIndex   // IN: command index to check
		)
{
    return (IS_ATTRIBUTE(s_ccAttr[commandIndex], TPMA_CC, V));
}
#endif /* libtpms added */