Since we’re working on early boot TCG interfaces, is this a good time to discuss a standard way to init the log with measurements made by the HW root of trust prior to Tcg2Pei? We were using a NULL lib and a registration pattern on the PEIM, but I’m open to other ideas, too. Thoughts?

- Bret
________________________________
From: devel@edk2.groups.io <devel@edk2.groups.io> on behalf of Yao, Jiewen via groups.io <jiewen.yao=intel.com@groups.io>
Sent: Tuesday, July 14, 2020 10:08:30 PM
To: Zhang, Qi1 <qi1.zhang@intel.com>; devel@edk2.groups.io <devel@edk2.groups.io>
Cc: Wang, Jian J <jian.j.wang@intel.com>
Subject: [EXTERNAL] Re: [edk2-devel] [PATCH 1/6] SecurityPkg/TcgPpi: Add TcgPpi header file.

Thanks Qi.

I just thought one use case that a PEIM may already have a calculated hash  (https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Ftianocore%2Fedk2%2Fblob%2Fmaster%2FSecurityPkg%2FTcg%2FTcg2Pei%2FTcg2Pei.c%23L652&amp;data=02%7C01%7CBret.Barkelew%40microsoft.com%7Cbe2bb9ca3e0c4dd95a0a08d8287d21ec%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637303865193113145&amp;sdata=V3ofX%2Fvs6Pp%2Bc79cQx4iSB6K324Lyptqrj7FtvmDwsc%3D&amp;reserved=0)
We may need add a flag to support this pre-hash use case. Such as:

> +(EFIAPI *EDKII_TCG_HASH_LOG_EXTEND_EVENT)(
>
> +  IN      EDKII_TCG_PPI             *This,
>
> +  IN      UINT64                   Flags,  // new field. BIT0 = 0 means HashData is the data to be hashed; BIT0 = 1 means HashData is the pre-hash digest.
>
> +  IN      UINT8                     *HashData,
>
> +  IN      UINTN                     HashDataLen,
>
> +  IN      TCG_PCR_EVENT_HDR         *NewEventHdr,
>
> +  IN      UINT8                     *NewEventData
>
> +  );

> -----Original Message-----
> From: Zhang, Qi1 <qi1.zhang@intel.com>
> Sent: Tuesday, July 14, 2020 2:49 PM
> To: devel@edk2.groups.io
> Cc: Yao, Jiewen <jiewen.yao@intel.com>; Wang, Jian J <jian.j.wang@intel.com>;
> Zhang, Chao B <chao.b.zhang@intel.com>
> Subject: [PATCH 1/6] SecurityPkg/TcgPpi: Add TcgPpi header file.
>
> From: Jiewen Yao <jiewen.yao@intel.com>
>
> REF: https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.tianocore.org%2Fshow_bug.cgi%3Fid%3D2841&amp;data=02%7C01%7CBret.Barkelew%40microsoft.com%7Cbe2bb9ca3e0c4dd95a0a08d8287d21ec%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637303865193113145&amp;sdata=VgWc2LNPqJRlBisa%2Bvuqq2THVK62f66uzzqh4cle4Rs%3D&amp;reserved=0
>
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Cc: Jian J Wang <jian.j.wang@intel.com>
> Cc: Chao Zhang <chao.b.zhang@intel.com>
> Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
> ---
>  SecurityPkg/Include/Ppi/Tcg.h | 50 +++++++++++++++++++++++++++++++++++
>  1 file changed, 50 insertions(+)
>  create mode 100644 SecurityPkg/Include/Ppi/Tcg.h
>
> diff --git a/SecurityPkg/Include/Ppi/Tcg.h b/SecurityPkg/Include/Ppi/Tcg.h
> new file mode 100644
> index 0000000000..4eacd57166
> --- /dev/null
> +++ b/SecurityPkg/Include/Ppi/Tcg.h
> @@ -0,0 +1,50 @@
> +/** @file
>
> +  TCG PPI services.
>
> +
>
> +Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
>
> +SPDX-License-Identifier: BSD-2-Clause-Patent
>
> +
>
> +**/
>
> +
>
> +#ifndef _TCG_PPI_H_
>
> +#define _TCG_PPI_H_
>
> +
>
> +#include <IndustryStandard/UefiTcgPlatform.h>
>
> +
>
> +typedef struct _EDKII_TCG_PPI EDKII_TCG_PPI;
>
> +
>
> +/**
>
> +  Tpm measure and log data, and extend the measurement result into a specific
> PCR.
>
> +
>
> +  @param[in]      This          Indicates the calling context
>
> +  @param[in]      HashData      Physical address of the start of the data buffer
>
> +                                to be hashed, extended, and logged.
>
> +  @param[in]      HashDataLen   The length, in bytes, of the buffer referenced by
> HashData.
>
> +  @param[in]      NewEventHdr   Pointer to a TCG_PCR_EVENT_HDR data
> structure.
>
> +  @param[in]      NewEventData  Pointer to the new event data.
>
> +
>
> +  @retval EFI_SUCCESS           Operation completed successfully.
>
> +  @retval EFI_UNSUPPORTED       TPM device not available.
>
> +  @retval EFI_OUT_OF_RESOURCES  Out of memory.
>
> +  @retval EFI_DEVICE_ERROR      The operation was unsuccessful.
>
> +**/
>
> +typedef
>
> +EFI_STATUS
>
> +(EFIAPI *EDKII_TCG_HASH_LOG_EXTEND_EVENT)(
>
> +  IN      EDKII_TCG_PPI             *This,
>
> +  IN      UINT8                     *HashData,
>
> +  IN      UINTN                     HashDataLen,
>
> +  IN      TCG_PCR_EVENT_HDR         *NewEventHdr,
>
> +  IN      UINT8                     *NewEventData
>
> +  );
>
> +
>
> +///
>
> +/// The EFI_TCG Protocol abstracts TCG activity.
>
> +///
>
> +struct _EDKII_TCG_PPI {
>
> +  EDKII_TCG_HASH_LOG_EXTEND_EVENT     HashLogExtendEvent;
>
> +};
>
> +
>
> +extern EFI_GUID gEdkiiTcgPpiGuid;
>
> +
>
> +#endif
>
> --
> 2.26.2.windows.1