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123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
#ifndef libhis_clearpcr_hpp
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#define libhis_clearpc_hpp
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#ifdef WINDOWS
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#include "tspi.h"
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#include "tss_error.h"
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#include "tss_defines.h"
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#endif
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#ifdef LINUX
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#include <tss/tspi.h>
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#include <tss/tss_error.h>
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#include <tss/tss_defines.h>
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#endif
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#include "libhis_exception.hpp"
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class libhis_clearpcr
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{
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public:
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libhis_clearpcr()
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{
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//create a context object
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result = Tspi_Context_Create(&hcontext);
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if(result != TSS_SUCCESS) throw libhis_exception("Create Conntext", result);
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//Create TPM policy
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result = Tspi_Context_CreateObject(hcontext, TSS_OBJECT_TYPE_POLICY, TSS_POLICY_USAGE, &hpolicy_tpm);
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if(result != TSS_SUCCESS) throw libhis_exception("Create TPM Policy", result);
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//Create PCRS object
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result = Tspi_Context_CreateObject(hcontext, TSS_OBJECT_TYPE_PCRS, TSS_PCRS_STRUCT_INFO_SHORT, &hpcrs);
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if(result != TSS_SUCCESS) throw libhis_exception("Create PCRS", result);
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}
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void clearpcr(
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unsigned char *auth_tpm_value,
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unsigned long auth_tpm_size,
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bool auth_tpm_sha1,
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unsigned char *mask)
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{
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//establish a session
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result = Tspi_Context_Connect(hcontext, 0);
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if(result != TSS_SUCCESS) throw libhis_exception("Connect Context", result);
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//get the TPM object
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result = Tspi_Context_GetTpmObject(hcontext, &htpm);
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if(result != TSS_SUCCESS) throw libhis_exception("Get TPM Object", result);
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//set up TPM auth
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if(auth_tpm_sha1)
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{
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result = Tspi_Policy_SetSecret(hpolicy_tpm, TSS_SECRET_MODE_SHA1, auth_tpm_size, auth_tpm_value);
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if(result != TSS_SUCCESS) throw libhis_exception("Set TPM Secret SHA1", result);
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}
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else
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{
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result = Tspi_Policy_SetSecret(hpolicy_tpm, TSS_SECRET_MODE_PLAIN, auth_tpm_size, auth_tpm_value);
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if(result != TSS_SUCCESS) throw libhis_exception("Set TPM Secret Plain", result);
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}
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//assign the TPM auth to the TPM
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result = Tspi_Policy_AssignToObject(hpolicy_tpm, htpm);
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if(result != TSS_SUCCESS) throw libhis_exception("Assign TPM Secret to TPM", result);
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//set up mask
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bool bitmask[24];
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for(short i = 0; i < 24; i++)
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bitmask[i] = 0;
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masktobitmask(mask, bitmask);
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//collect the PCR values
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UINT32 temp_size;
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BYTE *temp_value;
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for(unsigned long i = 0; i < 24; i++)
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{
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if(bitmask[i])
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{
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result = Tspi_TPM_PcrRead(htpm, i, &temp_size, &temp_value);
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if(result != TSS_SUCCESS) throw libhis_exception("PCR value read", result);
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result = Tspi_PcrComposite_SelectPcrIndexEx(hpcrs, i, TSS_PCRS_DIRECTION_RELEASE);
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if(result != TSS_SUCCESS) throw libhis_exception("Set PCR composite index", result);
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result = Tspi_PcrComposite_SetPcrValue(hpcrs, i, temp_size, temp_value);
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if(result != TSS_SUCCESS) throw libhis_exception("Store PCR value in composite", result);
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result = Tspi_Context_FreeMemory(hcontext, temp_value);
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if(result != TSS_SUCCESS) throw libhis_exception("Clear temporary memory", result);
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}
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}
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//clear PCR value
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result = Tspi_TPM_PcrReset(htpm, hpcrs);
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if(result != TSS_SUCCESS) throw libhis_exception("Reset PCRs", result);
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return;
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}
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~libhis_clearpcr()
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{
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//clean up PCRS
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result = Tspi_Context_CloseObject(hcontext, hpcrs);
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if(result != TSS_SUCCESS) throw libhis_exception("Close PCRS", result);
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//clean up TPM policy
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result = Tspi_Context_CloseObject(hcontext, hpolicy_tpm);
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if(result != TSS_SUCCESS) throw libhis_exception("Close TPM Policy", result);
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//close context
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result = Tspi_Context_Close(hcontext);
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if(result != TSS_SUCCESS) throw libhis_exception("Close Context", result);
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}
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private:
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TSS_RESULT result;
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TSS_HCONTEXT hcontext;
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TSS_HTPM htpm;
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TSS_HPOLICY hpolicy_tpm;
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TSS_HPCRS hpcrs;
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};
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#endif
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