path: root/src/tpm2/StartupCommands.c

/********************************************************************************/
/*										*/
/*			 	Startup Commands   				*/
/*			     Written by Ken Goldman				*/
/*		       IBM Thomas J. Watson Research Center			*/
/*            $Id: StartupCommands.c 1594 2020-03-26 22:15:48Z kgoldman $	*/
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/* 9.2	_TPM_Init */
#include "Tpm.h"
#include "PlatformACT_fp.h"		/* added kgold */
#include "_TPM_Init_fp.h"
#include "StateMarshal.h"   /* libtpms added */
// This function is used to process a _TPM_Init indication.
LIB_EXPORT void
_TPM_Init(
	  void
	  )
{
    BOOL restored = FALSE;  /* libtpms added */

    g_powerWasLost = g_powerWasLost | _plat__WasPowerLost();
#if SIMULATION && !defined NDEBUG  /* libtpms changed */
    // If power was lost and this was a simulation, put canary in RAM used by NV
    // so that uninitialized memory can be detected more easily
    if(g_powerWasLost)
	{
	    memset(&gc, 0xbb, sizeof(gc));
	    memset(&gr, 0xbb, sizeof(gr));
	    memset(&gp, 0xbb, sizeof(gp));
	    memset(&go, 0xbb, sizeof(go));
	}
#endif
#if SIMULATION
    // Clear the flag that forces failure on self-test
    g_forceFailureMode = FALSE;
#endif
    // Disable the tick processing
    _plat__ACT_EnableTicks(FALSE);
    // Set initialization state
    TPMInit();
    // Set g_DRTMHandle as unassigned
    g_DRTMHandle = TPM_RH_UNASSIGNED;
    // No H-CRTM, yet.
    g_DrtmPreStartup = FALSE;
    // Initialize the NvEnvironment.
    g_nvOk = NvPowerOn();
    // Initialize cryptographic functions
    g_inFailureMode |= (CryptInit() == FALSE); /* libtpms changed */
    if(!g_inFailureMode)
	{
	    // Load the persistent data
	    NvReadPersistent();
	    // Load the orderly data (clock and DRBG state).
	    // If this is not done here, things break
	    NvRead(&go, NV_ORDERLY_DATA, sizeof(go));
	    // Start clock. Need to do this after NV has been restored.
	    TimePowerOn();

            /* libtpms added begin */
            VolatileLoad(&restored);
            if (restored)
                NVShadowRestore();
	    /* libtpms added end */
	}
    return;
}
#include "Tpm.h"
#include "Startup_fp.h"
#if CC_Startup	 // Conditional expansion of this file
TPM_RC
TPM2_Startup(
	     Startup_In      *in             // IN: input parameter list
	     )
{
    STARTUP_TYPE         startup;
    BYTE                 locality = _plat__LocalityGet();
    BOOL                 OK = TRUE;    // The command needs NV update.
    RETURN_IF_NV_IS_NOT_AVAILABLE;
    // Get the flags for the current startup locality and the H-CRTM.
    // Rather than generalizing the locality setting, this code takes advantage
    // of the fact that the PC Client specification only allows Startup()
    // from locality 0 and 3. To generalize this probably would require a
    // redo of the NV space and since this is a feature that is hardly ever used
    // outside of the PC Client, this code just support the PC Client needs.
    // Input Validation
    // Check that the locality is a supported value
    if(locality != 0 && locality != 3)
	return TPM_RC_LOCALITY;
    // If there was a H-CRTM, then treat the locality as being 3
    // regardless of what the Startup() was. This is done to preserve the
    // H-CRTM PCR so that they don't get overwritten with the normal
    // PCR startup initialization. This basically means that g_StartupLocality3
    // and g_DrtmPreStartup can't both be SET at the same time.
    if(g_DrtmPreStartup)
	locality = 0;
    g_StartupLocality3 = (locality == 3);
#if USE_DA_USED
    // If there was no orderly shutdown, then there might have been a write to
    // failedTries that didn't get recorded but only if g_daUsed was SET in the
    // shutdown state
    g_daUsed = (gp.orderlyState == SU_DA_USED_VALUE);
    if(g_daUsed)
	gp.orderlyState = SU_NONE_VALUE;
#endif
    g_prevOrderlyState = gp.orderlyState;
    // If there was a proper shutdown, then the startup modifiers are in the
    // orderlyState. Turn them off in the copy.
    if(IS_ORDERLY(g_prevOrderlyState))
	g_prevOrderlyState &=  ~(PRE_STARTUP_FLAG | STARTUP_LOCALITY_3);
    // If this is a Resume,
    if(in->startupType == TPM_SU_STATE)
	{
	    // then there must have been a prior TPM2_ShutdownState(STATE)
	    if(g_prevOrderlyState != TPM_SU_STATE)
		return TPM_RCS_VALUE + RC_Startup_startupType;
	    // and the part of NV used for state save must have been recovered
	    // correctly.
	    // NOTE: if this fails, then the caller will need to do Startup(CLEAR). The
	    // code for Startup(Clear) cannot fail if the NV can't be read correctly
	    // because that would prevent the TPM from ever getting unstuck.
	    if(g_nvOk == FALSE)
		return TPM_RC_NV_UNINITIALIZED;
	    // For Resume, the H-CRTM has to be the same as the previous boot
	    if(g_DrtmPreStartup != ((gp.orderlyState & PRE_STARTUP_FLAG) != 0))
		return TPM_RCS_VALUE + RC_Startup_startupType;
	    if(g_StartupLocality3 != ((gp.orderlyState & STARTUP_LOCALITY_3) != 0))
		return TPM_RC_LOCALITY;
	}
    // Clean up the gp state
    gp.orderlyState = g_prevOrderlyState;

    // Internal Date Update
    if((gp.orderlyState == TPM_SU_STATE) && (g_nvOk == TRUE))
	{
	    // Always read the data that is only cleared on a Reset because this is not
	    // a reset
	    NvRead(&gr, NV_STATE_RESET_DATA, sizeof(gr));
	    if(in->startupType == TPM_SU_STATE)
	        {
	            // If this is a startup STATE (a Resume) need to read the data
	            // that is cleared on a startup CLEAR because this is not a Reset
	            // or Restart.
	            NvRead(&gc, NV_STATE_CLEAR_DATA, sizeof(gc));
	            startup = SU_RESUME;
	        }
	    else
		startup = SU_RESTART;
	}
    else
	// Will do a TPM reset if Shutdown(CLEAR) and Startup(CLEAR) or no shutdown
	// or there was a failure reading the NV data.
	startup = SU_RESET;
    // Startup for cryptographic library. Don't do this until after the orderly
    // state has been read in from NV.
    OK = OK && CryptStartup(startup);
    // When the cryptographic library has been started, indicate that a TPM2_Startup
    // command has been received.
    OK = OK && TPMRegisterStartup();
    // Read the platform unique value that is used as VENDOR_PERMANENT
    // authorization value
    g_platformUniqueDetails.t.size
	= (UINT16)_plat__GetUnique(1, sizeof(g_platformUniqueDetails.t.buffer),
				   g_platformUniqueDetails.t.buffer);
    // Start up subsystems
    // Start set the safe flag
    OK = OK && TimeStartup(startup);
    // Start dictionary attack subsystem
    OK = OK && DAStartup(startup);
    // Enable hierarchies
    OK = OK && HierarchyStartup(startup);
    // Restore/Initialize PCR
    OK = OK && PCRStartup(startup, locality);
    // Restore/Initialize command audit information
    OK = OK && CommandAuditStartup(startup);
    // Restore the ACT
    OK = OK && ActStartup(startup);
    //// The following code was moved from Time.c where it made no sense
    if (OK)
	{
	    switch (startup)
		{
		  case SU_RESUME:
		    // Resume sequence
		    gr.restartCount++;
		    break;
		  case SU_RESTART:
		    // Hibernate sequence
		    gr.clearCount++;
		    gr.restartCount++;
		    break;
		  default:
		    // Reset object context ID to 0
		    gr.objectContextID = 0;
		    // Reset clearCount to 0
		    gr.clearCount = 0;
		    // Reset sequence
		    // Increase resetCount
		    gp.resetCount++;
		    // Write resetCount to NV
		    NV_SYNC_PERSISTENT(resetCount);
		    gp.totalResetCount++;
		    // We do not expect the total reset counter overflow during the life
		    // time of TPM.  if it ever happens, TPM will be put to failure mode
		    // and there is no way to recover it.
		    // The reason that there is no recovery is that we don't increment
		    // the NV totalResetCount when incrementing would make it 0. When the
		    // TPM starts up again, the old value of totalResetCount will be read
		    // and we will get right back to here with the increment failing.
#if 0    // libtpms added
		    if(gp.totalResetCount == 0)
			FAIL(FATAL_ERROR_INTERNAL);
#endif   // libtpms added
		    // Write total reset counter to NV
		    NV_SYNC_PERSISTENT(totalResetCount);
		    // Reset restartCount
		    gr.restartCount = 0;
		    break;
		}
	}
    // Initialize session table
    OK = OK && SessionStartup(startup);
    // Initialize object table
    OK = OK && ObjectStartup();
    // Initialize index/evict data.  This function clears read/write locks
    // in NV index
    OK = OK && NvEntityStartup(startup);
    // Initialize the orderly shut down flag for this cycle to SU_NONE_VALUE.
    gp.orderlyState = SU_NONE_VALUE;
    OK = OK && NV_SYNC_PERSISTENT(orderlyState);
    // This can be reset after the first completion of a TPM2_Startup() after
    // a power loss. It can probably be reset earlier but this is an OK place.
    if (OK) 
	g_powerWasLost = FALSE;
    return (OK) ? TPM_RC_SUCCESS : TPM_RC_FAILURE;
}
#endif // CC_Startup
#include "Tpm.h"
#include "Shutdown_fp.h"
#if CC_Shutdown  // Conditional expansion of this file
TPM_RC
TPM2_Shutdown(
	      Shutdown_In     *in             // IN: input parameter list
	      )
{
    // The command needs NV update.  Check if NV is available.
    // A TPM_RC_NV_UNAVAILABLE or TPM_RC_NV_RATE error may be returned at
    // this point
    RETURN_IF_NV_IS_NOT_AVAILABLE;
    // Input Validation
    // If PCR bank has been reconfigured, a CLEAR state save is required
    if(g_pcrReConfig && in->shutdownType == TPM_SU_STATE)
	return TPM_RCS_TYPE + RC_Shutdown_shutdownType;
    // Internal Data Update
    gp.orderlyState = in->shutdownType;
#if USE_DA_USED
    // CLEAR g_daUsed so that any future DA-protected access will cause the
    // shutdown to become non-orderly. It is not sufficient to invalidate the 
    // shutdown state after a DA failure because an attacker can inhibit access 
    // to NV and use the fact that an update of failedTries was attempted as an 
    // indication of an authorization failure. By making sure that the orderly state
    // is CLEAR before any DA attempt, this prevents the possibility of this 'attack.'
    g_daUsed = FALSE;
#endif
    // PCR private date state save
    PCRStateSave(in->shutdownType);
    // Save the ACT state
    ActShutdown(in->shutdownType);
    // Save RAM backed NV index data
    NvUpdateIndexOrderlyData();
#if ACCUMULATE_SELF_HEAL_TIMER
    // Save the current time value
    go.time = g_time;
#endif
    // Save all orderly data
    NvWrite(NV_ORDERLY_DATA, sizeof(ORDERLY_DATA), &go);
    if(in->shutdownType == TPM_SU_STATE)
	{
	    // Save STATE_RESET and STATE_CLEAR data
	    NvWrite(NV_STATE_CLEAR_DATA, sizeof(STATE_CLEAR_DATA), &gc);
	    NvWrite(NV_STATE_RESET_DATA, sizeof(STATE_RESET_DATA), &gr);
	    // Save the startup flags for resume
	    if(g_DrtmPreStartup)
		gp.orderlyState = TPM_SU_STATE | PRE_STARTUP_FLAG;
	    else if(g_StartupLocality3)
		gp.orderlyState = TPM_SU_STATE | STARTUP_LOCALITY_3;
	}
    // only two shutdown options
    else if(in->shutdownType != TPM_SU_CLEAR)
	{
	    return TPM_RCS_VALUE + RC_Shutdown_shutdownType;
	}
    NV_SYNC_PERSISTENT(orderlyState);
    return TPM_RC_SUCCESS;
}
#endif // CC_Shutdown