From 07cdba18cd974d818556d752facfbf35a8d0f012 Mon Sep 17 00:00:00 2001 From: Jiewen Yao Date: Wed, 14 Sep 2016 16:28:12 +0800 Subject: SecurityPkg/TPM2: Extract GetSupportedAndActivePcrs to Tpm2CommandLib This patch extracts function Tpm2GetCapabilitySupportedAndActivePcrs() from drivers and also update Tcg2ExecutePhysicalPresence() to call Tpm2GetCapabilitySupportedAndActivePcrs() instead of Tcg2Protocol->GetCapability to query the TPM to determine which hashing algorithms are supported. Cc: Chao B Zhang Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jiewen Yao Signed-off-by: Star Zeng Reviewed-by: Chao Zhang --- .../DxeTcg2PhysicalPresenceLib.c | 17 ++-- .../Library/Tpm2CommandLib/Tpm2Capability.c | 92 ++++++++++++++++++++++ 2 files changed, 97 insertions(+), 12 deletions(-) (limited to 'SecurityPkg/Library') diff --git a/SecurityPkg/Library/DxeTcg2PhysicalPresenceLib/DxeTcg2PhysicalPresenceLib.c b/SecurityPkg/Library/DxeTcg2PhysicalPresenceLib/DxeTcg2PhysicalPresenceLib.c index d1ed7e83c7..4cec0f7527 100644 --- a/SecurityPkg/Library/DxeTcg2PhysicalPresenceLib/DxeTcg2PhysicalPresenceLib.c +++ b/SecurityPkg/Library/DxeTcg2PhysicalPresenceLib/DxeTcg2PhysicalPresenceLib.c @@ -160,17 +160,10 @@ Tcg2ExecutePhysicalPresence ( ) { EFI_STATUS Status; - EFI_TCG2_PROTOCOL *Tcg2Protocol; - EFI_TCG2_BOOT_SERVICE_CAPABILITY ProtocolCapability; - - Status = gBS->LocateProtocol (&gEfiTcg2ProtocolGuid, NULL, (VOID **) &Tcg2Protocol); - ASSERT_EFI_ERROR (Status); + EFI_TCG2_EVENT_ALGORITHM_BITMAP TpmHashAlgorithmBitmap; + UINT32 ActivePcrBanks; - ProtocolCapability.Size = sizeof(ProtocolCapability); - Status = Tcg2Protocol->GetCapability ( - Tcg2Protocol, - &ProtocolCapability - ); + Status = Tpm2GetCapabilitySupportedAndActivePcrs (&TpmHashAlgorithmBitmap, &ActivePcrBanks); ASSERT_EFI_ERROR (Status); switch (CommandCode) { @@ -194,7 +187,7 @@ Tcg2ExecutePhysicalPresence ( return TCG_PP_OPERATION_RESPONSE_SUCCESS; case TCG2_PHYSICAL_PRESENCE_SET_PCR_BANKS: - Status = Tpm2PcrAllocateBanks (PlatformAuth, ProtocolCapability.HashAlgorithmBitmap, CommandParameter); + Status = Tpm2PcrAllocateBanks (PlatformAuth, TpmHashAlgorithmBitmap, CommandParameter); if (EFI_ERROR (Status)) { return TCG_PP_OPERATION_RESPONSE_BIOS_FAILURE; } else { @@ -210,7 +203,7 @@ Tcg2ExecutePhysicalPresence ( } case TCG2_PHYSICAL_PRESENCE_LOG_ALL_DIGESTS: - Status = Tpm2PcrAllocateBanks (PlatformAuth, ProtocolCapability.HashAlgorithmBitmap, ProtocolCapability.HashAlgorithmBitmap); + Status = Tpm2PcrAllocateBanks (PlatformAuth, TpmHashAlgorithmBitmap, TpmHashAlgorithmBitmap); if (EFI_ERROR (Status)) { return TCG_PP_OPERATION_RESPONSE_BIOS_FAILURE; } else { diff --git a/SecurityPkg/Library/Tpm2CommandLib/Tpm2Capability.c b/SecurityPkg/Library/Tpm2CommandLib/Tpm2Capability.c index 0fe2c367d2..9aab17f934 100644 --- a/SecurityPkg/Library/Tpm2CommandLib/Tpm2Capability.c +++ b/SecurityPkg/Library/Tpm2CommandLib/Tpm2Capability.c @@ -485,6 +485,98 @@ Tpm2GetCapabilityPcrs ( return EFI_SUCCESS; } +/** + This function will query the TPM to determine which hashing algorithms + are supported and which PCR banks are currently active. + + @param[out] TpmHashAlgorithmBitmap A bitmask containing the algorithms supported by the TPM. + @param[out] ActivePcrBanks A bitmask containing the PCRs currently allocated. + + @retval EFI_SUCCESS TPM was successfully queried and return values can be trusted. + @retval Others An error occurred, likely in communication with the TPM. + +**/ +EFI_STATUS +EFIAPI +Tpm2GetCapabilitySupportedAndActivePcrs ( + OUT UINT32 *TpmHashAlgorithmBitmap, + OUT UINT32 *ActivePcrBanks + ) +{ + EFI_STATUS Status; + TPML_PCR_SELECTION Pcrs; + UINTN Index; + + // + // Get supported PCR and current Active PCRs. + // + Status = Tpm2GetCapabilityPcrs (&Pcrs); + + // + // If error, assume that we have at least SHA-1 (and return the error.) + // + if (EFI_ERROR (Status)) { + DEBUG ((EFI_D_ERROR, "GetSupportedAndActivePcrs - Tpm2GetCapabilityPcrs fail!\n")); + *TpmHashAlgorithmBitmap = HASH_ALG_SHA1; + *ActivePcrBanks = HASH_ALG_SHA1; + } + // + // Otherwise, process the return data to determine what algorithms are supported + // and currently allocated. + // + else { + DEBUG ((EFI_D_INFO, "GetSupportedAndActivePcrs - Count = %08x\n", Pcrs.count)); + *TpmHashAlgorithmBitmap = 0; + *ActivePcrBanks = 0; + for (Index = 0; Index < Pcrs.count; Index++) { + switch (Pcrs.pcrSelections[Index].hash) { + case TPM_ALG_SHA1: + DEBUG ((EFI_D_VERBOSE, "GetSupportedAndActivePcrs - HASH_ALG_SHA1 present.\n")); + *TpmHashAlgorithmBitmap |= HASH_ALG_SHA1; + if (!IsZeroBuffer (Pcrs.pcrSelections[Index].pcrSelect, Pcrs.pcrSelections[Index].sizeofSelect)) { + DEBUG ((EFI_D_VERBOSE, "GetSupportedAndActivePcrs - HASH_ALG_SHA1 active.\n")); + *ActivePcrBanks |= HASH_ALG_SHA1; + } + break; + case TPM_ALG_SHA256: + DEBUG ((EFI_D_VERBOSE, "GetSupportedAndActivePcrs - HASH_ALG_SHA256 present.\n")); + *TpmHashAlgorithmBitmap |= HASH_ALG_SHA256; + if (!IsZeroBuffer (Pcrs.pcrSelections[Index].pcrSelect, Pcrs.pcrSelections[Index].sizeofSelect)) { + DEBUG ((EFI_D_VERBOSE, "GetSupportedAndActivePcrs - HASH_ALG_SHA256 active.\n")); + *ActivePcrBanks |= HASH_ALG_SHA256; + } + break; + case TPM_ALG_SHA384: + DEBUG ((EFI_D_VERBOSE, "GetSupportedAndActivePcrs - HASH_ALG_SHA384 present.\n")); + *TpmHashAlgorithmBitmap |= HASH_ALG_SHA384; + if (!IsZeroBuffer (Pcrs.pcrSelections[Index].pcrSelect, Pcrs.pcrSelections[Index].sizeofSelect)) { + DEBUG ((EFI_D_VERBOSE, "GetSupportedAndActivePcrs - HASH_ALG_SHA384 active.\n")); + *ActivePcrBanks |= HASH_ALG_SHA384; + } + break; + case TPM_ALG_SHA512: + DEBUG ((EFI_D_VERBOSE, "GetSupportedAndActivePcrs - HASH_ALG_SHA512 present.\n")); + *TpmHashAlgorithmBitmap |= HASH_ALG_SHA512; + if (!IsZeroBuffer (Pcrs.pcrSelections[Index].pcrSelect, Pcrs.pcrSelections[Index].sizeofSelect)) { + DEBUG ((EFI_D_VERBOSE, "GetSupportedAndActivePcrs - HASH_ALG_SHA512 active.\n")); + *ActivePcrBanks |= HASH_ALG_SHA512; + } + break; + case TPM_ALG_SM3_256: + DEBUG ((EFI_D_VERBOSE, "GetSupportedAndActivePcrs - HASH_ALG_SM3_256 present.\n")); + *TpmHashAlgorithmBitmap |= HASH_ALG_SM3_256; + if (!IsZeroBuffer (Pcrs.pcrSelections[Index].pcrSelect, Pcrs.pcrSelections[Index].sizeofSelect)) { + DEBUG ((EFI_D_VERBOSE, "GetSupportedAndActivePcrs - HASH_ALG_SM3_256 active.\n")); + *ActivePcrBanks |= HASH_ALG_SM3_256; + } + break; + } + } + } + + return Status; +} + /** This command returns the information of TPM AlgorithmSet. -- cgit v1.2.3